ecos-v2_0-branch: packages/net/tcpip/current/src/sys/netinet/tcp

annotate packages/net/tcpip/current/src/sys/netinet/tcp_input.c @ 97:ced4577552cd ecos-sw-2000-06-06

Merge from eCos master repository on 2000-06-06-08:44:00-BST

author	jlarmour
date	Tue, 06 Jun 2000 08:39:36 +0000
parents
children	e0c0827131d1

rev	line source
97 ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1 //==========================================================================
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3 // sys/netinet/tcp_input.c
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	4 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	5 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	6 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	7 //==========================================================================
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	8 //####COPYRIGHTBEGIN####
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	9 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	10 // -------------------------------------------
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	11 // The contents of this file are subject to the Red Hat eCos Public License
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	12 // Version 1.1 (the "License"); you may not use this file except in
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	13 // compliance with the License. You may obtain a copy of the License at
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	14 // http://www.redhat.com/
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	15 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	16 // Software distributed under the License is distributed on an "AS IS"
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	18 // License for the specific language governing rights and limitations under
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	19 // the License.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	20 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	21 // The Original Code is eCos - Embedded Configurable Operating System,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	22 // released September 30, 1998.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	23 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	24 // The Initial Developer of the Original Code is Red Hat.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	25 // Portions created by Red Hat are
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	27 // All Rights Reserved.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	28 // -------------------------------------------
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	29 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	30 //####COPYRIGHTEND####
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	31 //####BSDCOPYRIGHTBEGIN####
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	32 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	33 // -------------------------------------------
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	34 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	35 // Portions of this software may have been derived from OpenBSD or other sources,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	36 // and are covered by the appropriate copyright disclaimers included herein.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	37 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	38 // -------------------------------------------
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	39 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	40 //####BSDCOPYRIGHTEND####
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	41 //==========================================================================
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	42 //#####DESCRIPTIONBEGIN####
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	43 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	44 // Author(s): gthomas
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	45 // Contributors: gthomas
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	46 // Date: 2000-01-10
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	47 // Purpose:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	48 // Description:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	49 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	50 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	51 //####DESCRIPTIONEND####
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	52 //
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	53 //==========================================================================
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	54
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	55
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	56 /* $OpenBSD: tcp_input.c,v 1.54 1999/12/15 16:37:20 provos Exp $ */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	57 /* $NetBSD: tcp_input.c,v 1.23 1996/02/13 23:43:44 christos Exp $ */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	58
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	59 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	60 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1994
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	61 * The Regents of the University of California. All rights reserved.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	62 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	63 * Redistribution and use in source and binary forms, with or without
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	64 * modification, are permitted provided that the following conditions
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	65 * are met:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	66 * 1. Redistributions of source code must retain the above copyright
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	67 * notice, this list of conditions and the following disclaimer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	68 * 2. Redistributions in binary form must reproduce the above copyright
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	69 * notice, this list of conditions and the following disclaimer in the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	70 * documentation and/or other materials provided with the distribution.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	71 * 3. All advertising materials mentioning features or use of this software
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	72 * must display the following acknowledgement:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	73 * This product includes software developed by the University of
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	74 * California, Berkeley and its contributors.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	75 * 4. Neither the name of the University nor the names of its contributors
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	76 * may be used to endorse or promote products derived from this software
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	77 * without specific prior written permission.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	78 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	79 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	80 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	81 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	82 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	83 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	84 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	85 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	86 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	87 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	88 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	89 * SUCH DAMAGE.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	90 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	91 * @(#)tcp_input.c 8.5 (Berkeley) 4/10/94
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	92 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	93
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	94 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	95 %%% portions-copyright-nrl-95
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	96 Portions of this software are Copyright 1995-1998 by Randall Atkinson,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	97 Ronald Lee, Daniel McDonald, Bao Phan, and Chris Winters. All Rights
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	98 Reserved. All rights under this copyright have been assigned to the US
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	99 Naval Research Laboratory (NRL). The NRL Copyright Notice and License
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	100 Agreement Version 1.1 (January 17, 1995) applies to these portions of the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	101 software.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	102 You should have received a copy of the license with this software. If you
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	103 didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	104 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	105
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	106 #ifndef TUBA_INCLUDE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	107 #include <sys/param.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	108 #ifndef __ECOS
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	109 #include <sys/systm.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	110 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	111 #include <sys/malloc.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	112 #include <sys/mbuf.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	113 #include <sys/protosw.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	114 #include <sys/socket.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	115 #include <sys/socketvar.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	116 #include <sys/errno.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	117
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	118 #include <net/if.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	119 #include <net/route.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	120
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	121 #include <netinet/in.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	122 #include <netinet/in_systm.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	123 #include <netinet/ip.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	124 #include <netinet/in_pcb.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	125 #include <netinet/ip_var.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	126 #include <netinet/tcp.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	127 #include <netinet/tcp_fsm.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	128 #include <netinet/tcp_seq.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	129 #include <netinet/tcp_timer.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	130 #include <netinet/tcp_var.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	131 #include <netinet/tcpip.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	132 #include <netinet/tcp_debug.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	133 #ifndef __ECOS
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	134 #include <dev/rndvar.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	135 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	136 #include <machine/stdarg.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	137 #ifndef __ECOS
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	138 #include <sys/md5k.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	139 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	140
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	141 #ifdef IPSEC
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	142 #include <netinet/ip_ipsp.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	143 #endif /* IPSEC */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	144
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	145 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	146 #ifndef INET
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	147 #include <netinet/in.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	148 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	149 #include <sys/domain.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	150 #include <netinet6/in6_var.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	151 #include <netinet/ip6.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	152 #include <netinet6/ip6_var.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	153 #include <netinet6/tcpipv6.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	154 #include <netinet/icmp6.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	155 #include <netinet6/nd6.h>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	156
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	157 #ifndef CREATE_IPV6_MAPPED
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	158 #define CREATE_IPV6_MAPPED(a6, a4) \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	159 do { \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	160 bzero(&(a6), sizeof(a6)); \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	161 (a6).s6_addr[10] = (a6).s6_addr[11] = 0xff; \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	162 (u_int32_t )&(a6).s6_addr[12] = (a4); \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	163 } while (0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	164 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	165
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	166 struct tcpiphdr tcp_saveti;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	167 struct tcpipv6hdr tcp_saveti6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	168
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	169 /* for the packet header length in the mbuf */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	170 #define M_PH_LEN(m) (((struct mbuf *)(m))->m_pkthdr.len)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	171 #define M_V6_LEN(m) (M_PH_LEN(m) - sizeof(struct ip6_hdr))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	172 #define M_V4_LEN(m) (M_PH_LEN(m) - sizeof(struct ip))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	173 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	174
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	175 int tcprexmtthresh = 3;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	176 struct tcpiphdr tcp_saveti;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	177 int tcptv_keep_init = TCPTV_KEEP_INIT;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	178
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	179 extern u_long sb_max;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	180
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	181 #endif /* TUBA_INCLUDE */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	182 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * PR_SLOWHZ)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	183
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	184 /* for modulo comparisons of timestamps */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	185 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	186 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	187
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	188 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	189 * Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	190 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	191 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	192 #define ND6_HINT(tp) \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	193 do { \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	194 if (tp && tp->t_inpcb && (tp->t_inpcb->inp_flags & INP_IPV6) \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	195 && !(tp->t_inpcb->inp_flags & INP_IPV6_MAPPED) \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	196 && tp->t_inpcb->inp_route6.ro_rt) { \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	197 nd6_nud_hint(tp->t_inpcb->inp_route6.ro_rt, NULL); \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	198 } \
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	199 } while (0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	200 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	201 #define ND6_HINT(tp)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	202 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	203
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	204 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	205 * Insert segment ti into reassembly queue of tcp with
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	206 * control block tp. Return TH_FIN if reassembly now includes
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	207 * a segment with FIN. The macro form does the common case inline
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	208 * (segment is the next to be received on an established connection,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	209 * and the queue is empty), avoiding linkage into and removal
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	210 * from the queue and repetition of various conversions.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	211 * Set DELACK for segments received in order, but ack immediately
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	212 * when segments are out of order (so fast retransmit can work).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	213 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	214
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	215 #ifndef TUBA_INCLUDE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	216
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	217 int
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	218 tcp_reass(tp, th, m, tlen)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	219 register struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	220 register struct tcphdr *th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	221 struct mbuf *m;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	222 int *tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	223 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	224 register struct ipqent p, q, nq, tiqe;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	225 struct socket *so = tp->t_inpcb->inp_socket;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	226 int flags;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	227
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	228 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	229 * Call with th==0 after become established to
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	230 * force pre-ESTABLISHED data up to user socket.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	231 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	232 if (th == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	233 goto present;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	234
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	235 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	236 * Allocate a new queue entry, before we throw away any data.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	237 * If we can't, just drop the packet. XXX
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	238 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	239 MALLOC(tiqe, struct ipqent *, sizeof (struct ipqent), M_IPQ, M_NOWAIT);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	240 if (tiqe == NULL) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	241 tcpstat.tcps_rcvmemdrop++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	242 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	243 return (0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	244 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	245
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	246 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	247 * Find a segment which begins after this one does.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	248 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	249 for (p = NULL, q = tp->segq.lh_first; q != NULL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	250 p = q, q = q->ipqe_q.le_next)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	251 if (SEQ_GT(q->ipqe_tcp->th_seq, th->th_seq))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	252 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	253
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	254 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	255 * If there is a preceding segment, it may provide some of
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	256 * our data already. If so, drop the data from the incoming
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	257 * segment. If it provides all of our data, drop us.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	258 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	259 if (p != NULL) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	260 register struct tcphdr *phdr = p->ipqe_tcp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	261 register int i;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	262
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	263 /* conversion to int (in i) handles seq wraparound */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	264 i = phdr->th_seq + phdr->th_reseqlen - th->th_seq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	265 if (i > 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	266 if (i >= *tlen) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	267 tcpstat.tcps_rcvduppack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	268 tcpstat.tcps_rcvdupbyte += *tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	269 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	270 FREE(tiqe, M_IPQ);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	271 return (0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	272 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	273 m_adj(m, i);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	274 *tlen -= i;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	275 th->th_seq += i;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	276 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	277 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	278 tcpstat.tcps_rcvoopack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	279 tcpstat.tcps_rcvoobyte += *tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	280
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	281 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	282 * While we overlap succeeding segments trim them or,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	283 * if they are completely covered, dequeue them.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	284 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	285 for (; q != NULL; q = nq) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	286 register struct tcphdr *qhdr = q->ipqe_tcp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	287 register int i = (th->th_seq + *tlen) - qhdr->th_seq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	288
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	289 if (i <= 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	290 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	291 if (i < qhdr->th_reseqlen) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	292 qhdr->th_seq += i;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	293 qhdr->th_reseqlen -= i;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	294 m_adj(q->ipqe_m, i);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	295 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	296 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	297 nq = q->ipqe_q.le_next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	298 m_freem(q->ipqe_m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	299 LIST_REMOVE(q, ipqe_q);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	300 FREE(q, M_IPQ);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	301 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	302
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	303 /* Insert the new fragment queue entry into place. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	304 tiqe->ipqe_m = m;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	305 th->th_reseqlen = *tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	306 tiqe->ipqe_tcp = th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	307 if (p == NULL) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	308 LIST_INSERT_HEAD(&tp->segq, tiqe, ipqe_q);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	309 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	310 LIST_INSERT_AFTER(p, tiqe, ipqe_q);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	311 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	312
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	313 present:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	314 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	315 * Present data to user, advancing rcv_nxt through
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	316 * completed sequence space.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	317 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	318 if (TCPS_HAVEESTABLISHED(tp->t_state) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	319 return (0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	320 q = tp->segq.lh_first;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	321 if (q == NULL \|\| q->ipqe_tcp->th_seq != tp->rcv_nxt)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	322 return (0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	323 if (tp->t_state == TCPS_SYN_RECEIVED && q->ipqe_tcp->th_reseqlen)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	324 return (0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	325 do {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	326 tp->rcv_nxt += q->ipqe_tcp->th_reseqlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	327 flags = q->ipqe_tcp->th_flags & TH_FIN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	328
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	329 nq = q->ipqe_q.le_next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	330 LIST_REMOVE(q, ipqe_q);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	331 ND6_HINT(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	332 if (so->so_state & SS_CANTRCVMORE)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	333 m_freem(q->ipqe_m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	334 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	335 sbappend(&so->so_rcv, q->ipqe_m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	336 FREE(q, M_IPQ);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	337 q = nq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	338 } while (q != NULL && q->ipqe_tcp->th_seq == tp->rcv_nxt);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	339 sorwakeup(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	340 return (flags);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	341 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	342
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	343 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	344 * First check for a port-specific bomb. We do not want to drop half-opens
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	345 * for other ports if this is the only port being bombed. We only check
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	346 * the bottom 40 half open connections, to avoid wasting too much time.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	347 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	348 * Or, otherwise it is more likely a generic syn bomb, so delete the oldest
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	349 * half-open connection.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	350 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	351 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	352 tcpdropoldhalfopen(avoidtp, port)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	353 struct tcpcb *avoidtp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	354 u_int16_t port;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	355 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	356 register struct inpcb *inp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	357 register struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	358 int ncheck = 40;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	359 int s;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	360
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	361 s = splnet();
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	362 inp = tcbtable.inpt_queue.cqh_first;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	363 if (inp) /* XXX */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	364 for (; inp != (struct inpcb *)&tcbtable.inpt_queue && --ncheck;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	365 inp = inp->inp_queue.cqe_prev) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	366 if ((tp = (struct tcpcb *)inp->inp_ppcb) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	367 tp != avoidtp &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	368 tp->t_state == TCPS_SYN_RECEIVED &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	369 port == inp->inp_lport) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	370 tcp_close(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	371 goto done;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	372 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	373 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	374
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	375 inp = tcbtable.inpt_queue.cqh_first;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	376 if (inp) /* XXX */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	377 for (; inp != (struct inpcb *)&tcbtable.inpt_queue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	378 inp = inp->inp_queue.cqe_prev) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	379 if ((tp = (struct tcpcb *)inp->inp_ppcb) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	380 tp != avoidtp &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	381 tp->t_state == TCPS_SYN_RECEIVED) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	382 tcp_close(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	383 goto done;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	384 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	385 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	386 done:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	387 splx(s);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	388 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	389
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	390 #if defined(INET6) && !defined(TCP6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	391 int
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	392 tcp6_input(mp, offp, proto)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	393 struct mbuf **mp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	394 int *offp, proto;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	395 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	396 struct mbuf m = mp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	397
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	398 #if defined(NFAITH) && 0 < NFAITH
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	399 if (m->m_pkthdr.rcvif) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	400 if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	401 /* XXX send icmp6 host/port unreach? */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	402 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	403 return IPPROTO_DONE;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	404 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	405 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	406 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	407
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	408 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	409 * draft-itojun-ipv6-tcp-to-anycast
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	410 * better place to put this in?
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	411 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	412 if (m->m_flags & M_ANYCAST6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	413 if (m->m_len >= sizeof(struct ip6_hdr)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	414 struct ip6_hdr ip6 = mtod(m, struct ip6_hdr );
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	415 icmp6_error(m, ICMP6_DST_UNREACH,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	416 ICMP6_DST_UNREACH_ADDR,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	417 (caddr_t)&ip6->ip6_dst - (caddr_t)ip6);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	418 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	419 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	420 return IPPROTO_DONE;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	421 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	422
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	423 tcp_input(m, *offp, proto);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	424 return IPPROTO_DONE;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	425 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	426 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	427
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	428 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	429 * TCP input routine, follows pages 65-76 of the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	430 * protocol specification dated September, 1981 very closely.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	431 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	432 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	433 #if __STDC__
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	434 tcp_input(struct mbuf *m, ...)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	435 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	436 tcp_input(m, va_alist)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	437 register struct mbuf *m;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	438 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	439 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	440 register struct tcpiphdr *ti;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	441 register struct inpcb *inp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	442 caddr_t optp = NULL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	443 int optlen = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	444 int len, tlen, off;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	445 register struct tcpcb *tp = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	446 register int tiflags;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	447 struct socket *so = NULL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	448 int todrop, acked, ourfinisacked, needoutput = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	449 int hdroptlen = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	450 short ostate = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	451 struct in_addr laddr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	452 int dropsocket = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	453 int iss = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	454 u_long tiwin;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	455 u_int32_t ts_val, ts_ecr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	456 int ts_present = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	457 int iphlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	458 va_list ap;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	459 register struct tcphdr *th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	460 #ifdef IPSEC
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	461 struct tdb *tdb = NULL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	462 #endif /* IPSEC */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	463 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	464 struct in6_addr laddr6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	465 unsigned short is_ipv6; /* Type of incoming datagram. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	466 struct ip6_hdr *ipv6 = NULL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	467 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	468
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	469 va_start(ap, m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	470 iphlen = va_arg(ap, int);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	471 va_end(ap);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	472
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	473 tcpstat.tcps_rcvtotal++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	474
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	475 #ifdef IPSEC
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	476 /* Save the last SA which was used to process the mbuf */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	477 if ((m->m_flags & (M_CONF\|M_AUTH)) && m->m_pkthdr.tdbi) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	478 struct tdb_ident *tdbi = m->m_pkthdr.tdbi;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	479 /* XXX gettdb() should really be called at spltdb(). */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	480 /* XXX this is splsoftnet(), currently they are the same. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	481 tdb = gettdb(tdbi->spi, &tdbi->dst, tdbi->proto);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	482 free(m->m_pkthdr.tdbi, M_TEMP);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	483 m->m_pkthdr.tdbi = NULL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	484 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	485 #endif /* IPSEC */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	486 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	487 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	488 * Before we do ANYTHING, we have to figure out if it's TCP/IPv6 or
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	489 * TCP/IPv4.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	490 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	491 is_ipv6 = mtod(m, struct ip *)->ip_v == 6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	492 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	493
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	494 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	495 * Get IP and TCP header together in first mbuf.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	496 * Note: IP leaves IP header in first mbuf.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	497 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	498 #ifndef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	499 ti = mtod(m, struct tcpiphdr *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	500 #else /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	501 if (!is_ipv6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	502 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	503 if (iphlen > sizeof (struct ip)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	504 #if 0 /XXX/
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	505 ip_stripoptions(m, (struct mbuf *)0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	506 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	507 #ifdef __ECOS
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	508 diag_printf("extension headers are not allowed\n");
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	509 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	510 printf("extension headers are not allowed\n");
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	511 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	512 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	513 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	514 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	515 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	516 if (m->m_len < iphlen + sizeof(struct tcphdr)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	517 if ((m = m_pullup2(m, iphlen + sizeof(struct tcphdr))) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	518 tcpstat.tcps_rcvshort++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	519 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	520 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	521 #ifndef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	522 ti = mtod(m, struct tcpiphdr *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	523 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	524 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	525
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	526 tlen = m->m_pkthdr.len - iphlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	527
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	528 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	529 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	530 * After that, do initial segment processing which is still very
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	531 * dependent on what IP version you're using.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	532 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	533
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	534 if (is_ipv6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	535 #ifdef DIAGNOSTIC
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	536 if (iphlen < sizeof(struct ip6_hdr)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	537 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	538 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	539 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	540 #endif /* DIAGNOSTIC */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	541
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	542 /* strip off any options */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	543 if (iphlen > sizeof(struct ip6_hdr)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	544 #if 0 /XXX/
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	545 ipv6_stripoptions(m, iphlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	546 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	547 #ifdef __ECOS
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	548 diag_printf("extension headers are not allowed\n");
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	549 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	550 printf("extension headers are not allowed\n");
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	551 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	552 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	553 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	554 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	555 iphlen = sizeof(struct ip6_hdr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	556 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	557
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	558 ti = NULL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	559 ipv6 = mtod(m, struct ip6_hdr *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	560
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	561 if (in6_cksum(m, IPPROTO_TCP, sizeof(struct ip6_hdr), tlen)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	562 tcpstat.tcps_rcvbadsum++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	563 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	564 } /* endif in6_cksum */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	565 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	566 ti = mtod(m, struct tcpiphdr *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	567 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	568
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	569 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	570 * Checksum extended TCP header and data.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	571 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	572 #ifndef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	573 tlen = ((struct ip *)ti)->ip_len;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	574 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	575 len = sizeof (struct ip) + tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	576 bzero(ti->ti_x1, sizeof ti->ti_x1);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	577 ti->ti_len = (u_int16_t)tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	578 HTONS(ti->ti_len);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	579 if ((ti->ti_sum = in_cksum(m, len)) != 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	580 tcpstat.tcps_rcvbadsum++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	581 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	582 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	583 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	584 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	585 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	586 #endif /* TUBA_INCLUDE */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	587
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	588 th = (struct tcphdr *)(mtod(m, caddr_t) + iphlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	589
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	590 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	591 * Check that TCP offset makes sense,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	592 * pull out TCP options and adjust length. XXX
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	593 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	594 off = th->th_off << 2;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	595 if (off < sizeof (struct tcphdr) \|\| off > tlen) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	596 tcpstat.tcps_rcvbadoff++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	597 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	598 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	599 tlen -= off;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	600 if (off > sizeof (struct tcphdr)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	601 if (m->m_len < iphlen + off) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	602 if ((m = m_pullup2(m, iphlen + off)) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	603 tcpstat.tcps_rcvshort++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	604 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	605 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	606 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	607 if (is_ipv6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	608 ipv6 = mtod(m, struct ip6_hdr *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	609 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	610 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	611 ti = mtod(m, struct tcpiphdr *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	612 th = (struct tcphdr *)(mtod(m, caddr_t) + iphlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	613 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	614 optlen = off - sizeof (struct tcphdr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	615 optp = mtod(m, caddr_t) + iphlen + sizeof(struct tcphdr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	616 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	617 * Do quick retrieval of timestamp options ("options
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	618 * prediction?"). If timestamp is the only option and it's
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	619 * formatted as recommended in RFC 1323 appendix A, we
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	620 * quickly get the values now and not bother calling
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	621 * tcp_dooptions(), etc.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	622 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	623 if ((optlen == TCPOLEN_TSTAMP_APPA \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	624 (optlen > TCPOLEN_TSTAMP_APPA &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	625 optp[TCPOLEN_TSTAMP_APPA] == TCPOPT_EOL)) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	626 (u_int32_t )optp == htonl(TCPOPT_TSTAMP_HDR) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	627 (th->th_flags & TH_SYN) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	628 ts_present = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	629 ts_val = ntohl((u_int32_t )(optp + 4));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	630 ts_ecr = ntohl((u_int32_t )(optp + 8));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	631 optp = NULL; /* we've parsed the options */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	632 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	633 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	634 tiflags = th->th_flags;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	635
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	636 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	637 * Convert TCP protocol specific fields to host format.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	638 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	639 NTOHL(th->th_seq);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	640 NTOHL(th->th_ack);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	641 NTOHS(th->th_win);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	642 NTOHS(th->th_urp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	643
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	644 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	645 * Locate pcb for segment.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	646 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	647 findpcb:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	648 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	649 if (is_ipv6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	650 inp = in6_pcbhashlookup(&tcbtable, &ipv6->ip6_src, th->th_sport,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	651 &ipv6->ip6_dst, th->th_dport);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	652 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	653 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	654 inp = in_pcbhashlookup(&tcbtable, ti->ti_src, ti->ti_sport,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	655 ti->ti_dst, ti->ti_dport);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	656 if (inp == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	657 ++tcpstat.tcps_pcbhashmiss;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	658 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	659 if (is_ipv6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	660 inp = in_pcblookup(&tcbtable, &ipv6->ip6_src,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	661 th->th_sport, &ipv6->ip6_dst, th->th_dport,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	662 INPLOOKUP_WILDCARD \| INPLOOKUP_IPV6);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	663 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	664 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	665 inp = in_pcblookup(&tcbtable, &ti->ti_src, ti->ti_sport,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	666 &ti->ti_dst, ti->ti_dport, INPLOOKUP_WILDCARD);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	667 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	668 * If the state is CLOSED (i.e., TCB does not exist) then
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	669 * all data in the incoming segment is discarded.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	670 * If the TCB exists but is in CLOSED state, it is embryonic,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	671 * but should either do a listen or a connect soon.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	672 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	673 if (inp == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	674 ++tcpstat.tcps_noport;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	675 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	676 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	677 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	678
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	679 tp = intotcpcb(inp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	680 if (tp == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	681 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	682 if (tp->t_state == TCPS_CLOSED)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	683 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	684
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	685 /* Unscale the window into a 32-bit value. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	686 if ((tiflags & TH_SYN) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	687 tiwin = th->th_win << tp->snd_scale;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	688 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	689 tiwin = th->th_win;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	690
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	691 so = inp->inp_socket;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	692 if (so->so_options & (SO_DEBUG\|SO_ACCEPTCONN)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	693 if (so->so_options & SO_DEBUG) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	694 ostate = tp->t_state;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	695 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	696 if (is_ipv6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	697 tcp_saveti6 = (mtod(m, struct tcpipv6hdr ));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	698 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	699 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	700 tcp_saveti = *ti;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	701 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	702 if (so->so_options & SO_ACCEPTCONN) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	703 struct socket *so1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	704
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	705 so1 = sonewconn(so, 0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	706 if (so1 == NULL) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	707 tcpdropoldhalfopen(tp, th->th_dport);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	708 so1 = sonewconn(so, 0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	709 if (so1 == NULL)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	710 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	711 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	712 so = so1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	713 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	714 * This is ugly, but ....
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	715 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	716 * Mark socket as temporary until we're
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	717 * committed to keeping it. The code at
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	718 * ``drop'' and ``dropwithreset'' check the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	719 * flag dropsocket to see if the temporary
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	720 * socket created here should be discarded.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	721 * We mark the socket as discardable until
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	722 * we're committed to it below in TCPS_LISTEN.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	723 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	724 dropsocket++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	725 #ifdef IPSEC
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	726 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	727 * We need to copy the required security levels
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	728 * from the old pcb.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	729 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	730 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	731 struct inpcb newinp = (struct inpcb )so->so_pcb;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	732 bcopy(inp->inp_seclevel, newinp->inp_seclevel,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	733 sizeof(inp->inp_seclevel));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	734 newinp->inp_secrequire = inp->inp_secrequire;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	735 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	736 #endif /* IPSEC */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	737 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	738 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	739 * inp still has the OLD in_pcb stuff, set the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	740 * v6-related flags on the new guy, too. This is
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	741 * done particularly for the case where an AF_INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	742 * socket is bound only to a port, and a v4 connection
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	743 * comes in on that port.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	744 * we also copy the flowinfo from the original pcb
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	745 * to the new one.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	746 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	747 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	748 int flags = inp->inp_flags;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	749 struct inpcb *oldinpcb = inp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	750
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	751 inp = (struct inpcb *)so->so_pcb;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	752 inp->inp_flags \|= (flags & (INP_IPV6 \| INP_IPV6_UNDEC
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	753 \| INP_IPV6_MAPPED));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	754 if ((inp->inp_flags & INP_IPV6) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	755 !(inp->inp_flags & INP_IPV6_MAPPED)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	756 inp->inp_ipv6.ip6_hlim =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	757 oldinpcb->inp_ipv6.ip6_hlim;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	758 inp->inp_ipv6.ip6_flow =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	759 oldinpcb->inp_ipv6.ip6_flow;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	760 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	761 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	762 #else /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	763 inp = (struct inpcb *)so->so_pcb;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	764 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	765 inp->inp_lport = th->th_dport;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	766 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	767 if (is_ipv6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	768 inp->inp_laddr6 = ipv6->ip6_dst;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	769 inp->inp_fflowinfo = htonl(0x0fffffff) &
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	770 ipv6->ip6_flow;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	771
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	772 /inp->inp_options = ip6_srcroute();/ /* soon. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	773 /* still need to tweak outbound options
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	774 processing to include this mbuf in
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	775 the right place and put the correct
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	776 NextHdr values in the right places.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	777 XXX rja */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	778 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	779 if (inp->inp_flags & INP_IPV6) {/* v4 to v6 socket */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	780 CREATE_IPV6_MAPPED(inp->inp_laddr6,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	781 ti->ti_dst.s_addr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	782 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	783 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	784 inp->inp_laddr = ti->ti_dst;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	785 inp->inp_options = ip_srcroute();
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	786 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	787 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	788 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	789 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	790 in_pcbrehash(inp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	791 tp = intotcpcb(inp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	792 tp->t_state = TCPS_LISTEN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	793
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	794 /* Compute proper scaling value from buffer space
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	795 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	796 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	797 TCP_MAXWIN << tp->request_r_scale < so->so_rcv.sb_hiwat)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	798 tp->request_r_scale++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	799 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	800 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	801
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	802 #ifdef IPSEC
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	803 /* Check if this socket requires security for incoming packets */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	804 if ((inp->inp_seclevel[SL_AUTH] >= IPSEC_LEVEL_REQUIRE &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	805 !(m->m_flags & M_AUTH)) \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	806 (inp->inp_seclevel[SL_ESP_TRANS] >= IPSEC_LEVEL_REQUIRE &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	807 !(m->m_flags & M_CONF))) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	808 #ifdef notyet
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	809 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	810 if (is_ipv6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	811 icmp6_error(m, ICMPV6_BLAH, ICMPV6_BLAH, 0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	812 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	813 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	814 icmp_error(m, ICMP_BLAH, ICMP_BLAH, 0, 0);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	815 #endif /* notyet */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	816 tcpstat.tcps_rcvnosec++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	817 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	818 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	819 /* Use tdb_bind_out for this inp's outbound communication */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	820 if (tdb)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	821 tdb_add_inp(tdb, inp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	822 #endif /IPSEC /
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	823
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	824 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	825 * Segment received on connection.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	826 * Reset idle time and keep-alive timer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	827 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	828 tp->t_idle = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	829 if (tp->t_state != TCPS_SYN_RECEIVED)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	830 tp->t_timer[TCPT_KEEP] = tcp_keepidle;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	831
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	832 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	833 if (!tp->sack_disable)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	834 tcp_del_sackholes(tp, th); /* Delete stale SACK holes */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	835 #endif /* TCP_SACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	836
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	837 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	838 * Process options if not in LISTEN state,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	839 * else do it below (after getting remote address).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	840 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	841 if (optp && tp->t_state != TCPS_LISTEN)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	842 tcp_dooptions(tp, optp, optlen, th,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	843 &ts_present, &ts_val, &ts_ecr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	844
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	845 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	846 if (!tp->sack_disable) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	847 tp->rcv_laststart = th->th_seq; /* last rec'vd segment*/
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	848 tp->rcv_lastend = th->th_seq + tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	849 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	850 #endif /* TCP_SACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	851 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	852 * Header prediction: check for the two common cases
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	853 * of a uni-directional data xfer. If the packet has
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	854 * no control flags, is in-sequence, the window didn't
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	855 * change and we're not retransmitting, it's a
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	856 * candidate. If the length is zero and the ack moved
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	857 * forward, we're the sender side of the xfer. Just
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	858 * free the data acked & wake any higher level process
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	859 * that was blocked waiting for space. If the length
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	860 * is non-zero and the ack didn't move, we're the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	861 * receiver side. If we're getting packets in-order
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	862 * (the reassembly queue is empty), add the data to
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	863 * the socket buffer and note that we need a delayed ack.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	864 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	865 if (tp->t_state == TCPS_ESTABLISHED &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	866 (tiflags & (TH_SYN\|TH_FIN\|TH_RST\|TH_URG\|TH_ACK)) == TH_ACK &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	867 (!ts_present \|\| TSTMP_GEQ(ts_val, tp->ts_recent)) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	868 th->th_seq == tp->rcv_nxt &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	869 tiwin && tiwin == tp->snd_wnd &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	870 tp->snd_nxt == tp->snd_max) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	871
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	872 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	873 * If last ACK falls within this segment's sequence numbers,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	874 * record the timestamp.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	875 * Fix from Braden, see Stevens p. 870
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	876 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	877 if (ts_present && SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	878 tp->ts_recent_age = tcp_now;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	879 tp->ts_recent = ts_val;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	880 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	881
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	882 if (tlen == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	883 if (SEQ_GT(th->th_ack, tp->snd_una) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	884 SEQ_LEQ(th->th_ack, tp->snd_max) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	885 tp->snd_cwnd >= tp->snd_wnd &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	886 tp->t_dupacks == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	887 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	888 * this is a pure ack for outstanding data.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	889 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	890 ++tcpstat.tcps_predack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	891 if (ts_present)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	892 tcp_xmit_timer(tp, tcp_now-ts_ecr+1);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	893 else if (tp->t_rtt &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	894 SEQ_GT(th->th_ack, tp->t_rtseq))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	895 tcp_xmit_timer(tp, tp->t_rtt);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	896 acked = th->th_ack - tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	897 tcpstat.tcps_rcvackpack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	898 tcpstat.tcps_rcvackbyte += acked;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	899 ND6_HINT(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	900 sbdrop(&so->so_snd, acked);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	901 tp->snd_una = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	902 #if defined(TCP_SACK) \|\| defined(TCP_NEWRENO)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	903 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	904 * We want snd_last to track snd_una so
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	905 * as to avoid sequence wraparound problems
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	906 * for very large transfers.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	907 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	908 tp->snd_last = tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	909 #endif /* TCP_SACK or TCP_NEWRENO */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	910 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	911 tp->snd_fack = tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	912 tp->retran_data = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	913 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	914 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	915
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	916 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	917 * If all outstanding data are acked, stop
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	918 * retransmit timer, otherwise restart timer
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	919 * using current (possibly backed-off) value.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	920 * If process is waiting for space,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	921 * wakeup/selwakeup/signal. If data
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	922 * are ready to send, let tcp_output
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	923 * decide between more output or persist.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	924 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	925 if (tp->snd_una == tp->snd_max)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	926 tp->t_timer[TCPT_REXMT] = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	927 else if (tp->t_timer[TCPT_PERSIST] == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	928 tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	929
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	930 if (sb_notify(&so->so_snd))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	931 sowwakeup(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	932 if (so->so_snd.sb_cc)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	933 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	934 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	935 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	936 } else if (th->th_ack == tp->snd_una &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	937 tp->segq.lh_first == NULL &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	938 tlen <= sbspace(&so->so_rcv)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	939 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	940 * This is a pure, in-sequence data packet
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	941 * with nothing on the reassembly queue and
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	942 * we have enough buffer space to take it.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	943 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	944 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	945 /* Clean receiver SACK report if present */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	946 if (!tp->sack_disable && tp->rcv_numsacks)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	947 tcp_clean_sackreport(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	948 #endif /* TCP_SACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	949 ++tcpstat.tcps_preddat;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	950 tp->rcv_nxt += tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	951 tcpstat.tcps_rcvpack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	952 tcpstat.tcps_rcvbyte += tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	953 ND6_HINT(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	954 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	955 * Drop TCP, IP headers and TCP options then add data
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	956 * to socket buffer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	957 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	958 m_adj(m, iphlen + off);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	959 sbappend(&so->so_rcv, m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	960 sorwakeup(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	961 if (th->th_flags & TH_PUSH)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	962 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	963 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	964 tp->t_flags \|= TF_DELACK;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	965 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	966 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	967 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	968
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	969 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	970 * Compute mbuf offset to TCP data segment.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	971 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	972 hdroptlen = iphlen + off;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	973
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	974 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	975 * Calculate amount of space in receive window,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	976 * and then do TCP input processing.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	977 * Receive window is amount of space in rcv queue,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	978 * but not less than advertised window.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	979 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	980 { int win;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	981
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	982 win = sbspace(&so->so_rcv);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	983 if (win < 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	984 win = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	985 tp->rcv_wnd = imax(win, (int)(tp->rcv_adv - tp->rcv_nxt));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	986 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	987
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	988 switch (tp->t_state) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	989
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	990 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	991 * If the state is LISTEN then ignore segment if it contains an RST.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	992 * If the segment contains an ACK then it is bad and send a RST.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	993 * If it does not contain a SYN then it is not interesting; drop it.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	994 * If it is from this socket, drop it, it must be forged.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	995 * Don't bother responding if the destination was a broadcast.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	996 * Otherwise initialize tp->rcv_nxt, and tp->irs, select an initial
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	997 * tp->iss, and send a segment:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	998 * <SEQ=ISS><ACK=RCV_NXT><CTL=SYN,ACK>
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	999 * Also initialize tp->snd_nxt to tp->iss+1 and tp->snd_una to tp->iss.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1000 * Fill in remote peer address fields if not previously specified.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1001 * Enter SYN_RECEIVED state, and process any other fields of this
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1002 * segment in this state.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1003 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1004 case TCPS_LISTEN: {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1005 struct mbuf *am;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1006 register struct sockaddr_in *sin;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1007 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1008 register struct sockaddr_in6 *sin6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1009 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1010
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1011 if (tiflags & TH_RST)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1012 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1013 if (tiflags & TH_ACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1014 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1015 if ((tiflags & TH_SYN) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1016 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1017 if (th->th_dport == th->th_sport) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1018 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1019 if (is_ipv6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1020 if (IN6_ARE_ADDR_EQUAL(&ipv6->ip6_src, &ipv6->ip6_dst))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1021 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1022 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1023 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1024 if (ti->ti_dst.s_addr == ti->ti_src.s_addr)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1025 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1026 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1027 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1028 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1029 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1030
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1031 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1032 * RFC1122 4.2.3.10, p. 104: discard bcast/mcast SYN
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1033 * in_broadcast() should never return true on a received
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1034 * packet with M_BCAST not set.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1035 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1036 if (m->m_flags & (M_BCAST\|M_MCAST))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1037 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1038 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1039 if (is_ipv6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1040 /* XXX What about IPv6 Anycasting ?? :-( rja */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1041 if (IN6_IS_ADDR_MULTICAST(&ipv6->ip6_dst))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1042 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1043 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1044 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1045 if (IN_MULTICAST(ti->ti_dst.s_addr))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1046 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1047 am = m_get(M_DONTWAIT, MT_SONAME); /* XXX */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1048 if (am == NULL)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1049 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1050 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1051 if (is_ipv6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1052 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1053 * This is probably the place to set the tp->pf value.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1054 * (Don't forget to do it in the v4 code as well!)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1055 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1056 * Also, remember to blank out things like flowlabel, or
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1057 * set flowlabel for accepted sockets in v6.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1058 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1059 * FURTHERMORE, this is PROBABLY the place where the whole
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1060 * business of key munging is set up for passive
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1061 * connections.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1062 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1063 am->m_len = sizeof(struct sockaddr_in6);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1064 sin6 = mtod(am, struct sockaddr_in6 *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1065 sin6->sin6_family = AF_INET6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1066 sin6->sin6_len = sizeof(struct sockaddr_in6);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1067 sin6->sin6_addr = ipv6->ip6_src;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1068 sin6->sin6_port = th->th_sport;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1069 sin6->sin6_flowinfo = htonl(0x0fffffff) &
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1070 inp->inp_ipv6.ip6_flow;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1071 laddr6 = inp->inp_laddr6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1072 if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1073 inp->inp_laddr6 = ipv6->ip6_dst;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1074 /* This is a good optimization. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1075 if (in6_pcbconnect(inp, am)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1076 inp->inp_laddr6 = laddr6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1077 (void) m_free(am);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1078 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1079 } /* endif in6_pcbconnect() */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1080 tp->pf = PF_INET6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1081 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1082 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1083 * Letting v4 incoming datagrams to reach valid
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1084 * PF_INET6 sockets causes some overhead here.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1085 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1086 if (inp->inp_flags & INP_IPV6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1087 if (!(inp->inp_flags & (INP_IPV6_UNDEC\|INP_IPV6_MAPPED))) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1088 (void) m_free(am);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1089 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1090 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1091
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1092 am->m_len = sizeof(struct sockaddr_in6);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1093
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1094 sin6 = mtod(am, struct sockaddr_in6 *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1095 sin6->sin6_family = AF_INET6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1096 sin6->sin6_len = sizeof(*sin6);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1097 CREATE_IPV6_MAPPED(sin6->sin6_addr, ti->ti_src.s_addr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1098 sin6->sin6_port = th->th_sport;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1099 sin6->sin6_flowinfo = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1100
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1101 laddr6 = inp->inp_laddr6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1102 if (inp->inp_laddr.s_addr == INADDR_ANY)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1103 CREATE_IPV6_MAPPED(inp->inp_laddr6, ti->ti_dst.s_addr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1104
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1105 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1106 * The pcb initially has the v6 default hoplimit
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1107 * set. We're sending v4 packets so we need to set
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1108 * the v4 ttl and tos.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1109 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1110 inp->inp_ip.ip_ttl = ip_defttl;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1111 inp->inp_ip.ip_tos = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1112
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1113 if (in6_pcbconnect(inp, am)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1114 inp->inp_laddr6 = laddr6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1115 (void) m_freem(am);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1116 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1117 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1118 tp->pf = PF_INET;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1119 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1120 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1121 am->m_len = sizeof (struct sockaddr_in);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1122 sin = mtod(am, struct sockaddr_in *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1123 sin->sin_family = AF_INET;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1124 sin->sin_len = sizeof(*sin);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1125 sin->sin_addr = ti->ti_src;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1126 sin->sin_port = ti->ti_sport;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1127 bzero((caddr_t)sin->sin_zero, sizeof(sin->sin_zero));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1128 laddr = inp->inp_laddr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1129 if (inp->inp_laddr.s_addr == INADDR_ANY)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1130 inp->inp_laddr = ti->ti_dst;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1131 if (in_pcbconnect(inp, am)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1132 inp->inp_laddr = laddr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1133 (void) m_free(am);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1134 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1135 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1136 (void) m_free(am);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1137 tp->pf = PF_INET;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1138 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1139 } /* if (inp->inp_flags & INP_IPV6) */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1140 } /* if (is_ipv6) */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1141 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1142 tp->t_template = tcp_template(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1143 if (tp->t_template == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1144 tp = tcp_drop(tp, ENOBUFS);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1145 dropsocket = 0; /* socket is already gone */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1146 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1147 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1148 if (optp)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1149 tcp_dooptions(tp, optp, optlen, th,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1150 &ts_present, &ts_val, &ts_ecr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1151 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1152 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1153 * If peer did not send a SACK_PERMITTED option (i.e., if
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1154 * tcp_dooptions() did not set TF_SACK_PERMIT), set
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1155 * sack_disable to 1 if it is currently 0.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1156 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1157 if (!tp->sack_disable)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1158 if ((tp->t_flags & TF_SACK_PERMIT) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1159 tp->sack_disable = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1160 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1161
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1162 if (iss)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1163 tp->iss = iss;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1164 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1165 tp->iss = tcp_iss;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1166 #ifdef TCP_COMPAT_42
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1167 tcp_iss += TCP_ISSINCR/2;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1168 #else /* TCP_COMPAT_42 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1169 tcp_iss += arc4random() % TCP_ISSINCR + 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1170 #endif /* !TCP_COMPAT_42 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1171 tp->irs = th->th_seq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1172 tcp_sendseqinit(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1173 #if defined (TCP_SACK) \|\| defined (TCP_NEWRENO)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1174 tp->snd_last = tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1175 #endif /* TCP_SACK \|\| TCP_NEWRENO */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1176 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1177 tp->snd_fack = tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1178 tp->retran_data = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1179 tp->snd_awnd = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1180 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1181 tcp_rcvseqinit(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1182 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1183 tp->t_state = TCPS_SYN_RECEIVED;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1184 tp->t_timer[TCPT_KEEP] = tcptv_keep_init;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1185 dropsocket = 0; /* committed to socket */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1186 tcpstat.tcps_accepts++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1187 goto trimthenstep6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1188 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1189
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1190 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1191 * If the state is SYN_RECEIVED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1192 * if seg contains SYN/ACK, send an RST.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1193 * if seg contains an ACK, but not for our SYN/ACK, send an RST
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1194 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1195
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1196 case TCPS_SYN_RECEIVED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1197 if (tiflags & TH_ACK) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1198 if (tiflags & TH_SYN) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1199 tcpstat.tcps_badsyn++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1200 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1201 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1202 if (SEQ_LEQ(th->th_ack, tp->snd_una) \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1203 SEQ_GT(th->th_ack, tp->snd_max))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1204 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1205 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1206 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1207
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1208 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1209 * If the state is SYN_SENT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1210 * if seg contains an ACK, but not for our SYN, drop the input.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1211 * if seg contains a RST, then drop the connection.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1212 * if seg does not contain SYN, then drop it.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1213 * Otherwise this is an acceptable SYN segment
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1214 * initialize tp->rcv_nxt and tp->irs
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1215 * if seg contains ack then advance tp->snd_una
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1216 * if SYN has been acked change to ESTABLISHED else SYN_RCVD state
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1217 * arrange for segment to be acked (eventually)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1218 * continue processing rest of data/controls, beginning with URG
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1219 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1220 case TCPS_SYN_SENT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1221 if ((tiflags & TH_ACK) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1222 (SEQ_LEQ(th->th_ack, tp->iss) \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1223 SEQ_GT(th->th_ack, tp->snd_max)))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1224 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1225 if (tiflags & TH_RST) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1226 if (tiflags & TH_ACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1227 tp = tcp_drop(tp, ECONNREFUSED);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1228 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1229 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1230 if ((tiflags & TH_SYN) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1231 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1232 if (tiflags & TH_ACK) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1233 tp->snd_una = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1234 if (SEQ_LT(tp->snd_nxt, tp->snd_una))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1235 tp->snd_nxt = tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1236 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1237 tp->t_timer[TCPT_REXMT] = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1238 tp->irs = th->th_seq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1239 tcp_rcvseqinit(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1240 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1241 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1242 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1243 * If we've sent a SACK_PERMITTED option, and the peer
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1244 * also replied with one, then TF_SACK_PERMIT should have
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1245 * been set in tcp_dooptions(). If it was not, disable SACKs.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1246 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1247 if (!tp->sack_disable)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1248 if ((tp->t_flags & TF_SACK_PERMIT) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1249 tp->sack_disable = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1250 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1251 if (tiflags & TH_ACK && SEQ_GT(tp->snd_una, tp->iss)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1252 tcpstat.tcps_connects++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1253 soisconnected(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1254 tp->t_state = TCPS_ESTABLISHED;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1255 /* Do window scaling on this connection? */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1256 if ((tp->t_flags & (TF_RCVD_SCALE\|TF_REQ_SCALE)) ==
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1257 (TF_RCVD_SCALE\|TF_REQ_SCALE)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1258 tp->snd_scale = tp->requested_s_scale;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1259 tp->rcv_scale = tp->request_r_scale;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1260 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1261 (void) tcp_reass(tp, (struct tcphdr *)0,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1262 (struct mbuf *)0, &tlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1263 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1264 * if we didn't have to retransmit the SYN,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1265 * use its rtt as our initial srtt & rtt var.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1266 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1267 if (tp->t_rtt)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1268 tcp_xmit_timer(tp, tp->t_rtt);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1269 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1270 * Since new data was acked (the SYN), open the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1271 * congestion window by one MSS. We do this
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1272 * here, because we won't go through the normal
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1273 * ACK processing below. And since this is the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1274 * start of the connection, we know we are in
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1275 * the exponential phase of slow-start.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1276 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1277 tp->snd_cwnd += tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1278 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1279 tp->t_state = TCPS_SYN_RECEIVED;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1280
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1281 trimthenstep6:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1282 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1283 * Advance ti->ti_seq to correspond to first data byte.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1284 * If data, trim to stay within window,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1285 * dropping FIN if necessary.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1286 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1287 th->th_seq++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1288 if (tlen > tp->rcv_wnd) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1289 todrop = tlen - tp->rcv_wnd;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1290 m_adj(m, -todrop);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1291 tlen = tp->rcv_wnd;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1292 tiflags &= ~TH_FIN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1293 tcpstat.tcps_rcvpackafterwin++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1294 tcpstat.tcps_rcvbyteafterwin += todrop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1295 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1296 tp->snd_wl1 = th->th_seq - 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1297 tp->rcv_up = th->th_seq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1298 goto step6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1299 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1300
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1301 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1302 * States other than LISTEN or SYN_SENT.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1303 * First check timestamp, if present.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1304 * Then check that at least some bytes of segment are within
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1305 * receive window. If segment begins before rcv_nxt,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1306 * drop leading data (and SYN); if nothing left, just ack.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1307 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1308 * RFC 1323 PAWS: If we have a timestamp reply on this segment
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1309 * and it's less than ts_recent, drop it.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1310 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1311 if (ts_present && (tiflags & TH_RST) == 0 && tp->ts_recent &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1312 TSTMP_LT(ts_val, tp->ts_recent)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1313
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1314 /* Check to see if ts_recent is over 24 days old. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1315 if ((int)(tcp_now - tp->ts_recent_age) > TCP_PAWS_IDLE) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1316 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1317 * Invalidate ts_recent. If this segment updates
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1318 * ts_recent, the age will be reset later and ts_recent
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1319 * will get a valid value. If it does not, setting
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1320 * ts_recent to zero will at least satisfy the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1321 * requirement that zero be placed in the timestamp
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1322 * echo reply when ts_recent isn't valid. The
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1323 * age isn't reset until we get a valid ts_recent
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1324 * because we don't want out-of-order segments to be
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1325 * dropped when ts_recent is old.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1326 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1327 tp->ts_recent = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1328 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1329 tcpstat.tcps_rcvduppack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1330 tcpstat.tcps_rcvdupbyte += tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1331 tcpstat.tcps_pawsdrop++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1332 goto dropafterack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1333 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1334 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1335
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1336 todrop = tp->rcv_nxt - th->th_seq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1337 if (todrop > 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1338 if (tiflags & TH_SYN) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1339 tiflags &= ~TH_SYN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1340 th->th_seq++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1341 if (th->th_urp > 1)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1342 th->th_urp--;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1343 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1344 tiflags &= ~TH_URG;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1345 todrop--;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1346 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1347 if (todrop >= tlen \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1348 (todrop == tlen && (tiflags & TH_FIN) == 0)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1349 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1350 * Any valid FIN must be to the left of the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1351 * window. At this point, FIN must be a
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1352 * duplicate or out-of-sequence, so drop it.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1353 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1354 tiflags &= ~TH_FIN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1355 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1356 * Send ACK to resynchronize, and drop any data,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1357 * but keep on processing for RST or ACK.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1358 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1359 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1360 tcpstat.tcps_rcvdupbyte += todrop = tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1361 tcpstat.tcps_rcvduppack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1362 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1363 tcpstat.tcps_rcvpartduppack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1364 tcpstat.tcps_rcvpartdupbyte += todrop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1365 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1366 hdroptlen += todrop; /* drop from head afterwards */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1367 th->th_seq += todrop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1368 tlen -= todrop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1369 if (th->th_urp > todrop)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1370 th->th_urp -= todrop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1371 else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1372 tiflags &= ~TH_URG;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1373 th->th_urp = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1374 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1375 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1376
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1377 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1378 * If new data are received on a connection after the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1379 * user processes are gone, then RST the other end.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1380 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1381 if ((so->so_state & SS_NOFDREF) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1382 tp->t_state > TCPS_CLOSE_WAIT && tlen) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1383 tp = tcp_close(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1384 tcpstat.tcps_rcvafterclose++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1385 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1386 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1387
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1388 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1389 * If segment ends after window, drop trailing data
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1390 * (and PUSH and FIN); if nothing left, just ACK.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1391 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1392 todrop = (th->th_seq + tlen) - (tp->rcv_nxt+tp->rcv_wnd);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1393 if (todrop > 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1394 tcpstat.tcps_rcvpackafterwin++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1395 if (todrop >= tlen) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1396 tcpstat.tcps_rcvbyteafterwin += tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1397 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1398 * If a new connection request is received
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1399 * while in TIME_WAIT, drop the old connection
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1400 * and start over if the sequence numbers
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1401 * are above the previous ones.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1402 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1403 if (tiflags & TH_SYN &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1404 tp->t_state == TCPS_TIME_WAIT &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1405 SEQ_GT(th->th_seq, tp->rcv_nxt)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1406 iss = tp->snd_nxt + TCP_ISSINCR;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1407 tp = tcp_close(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1408 goto findpcb;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1409 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1410 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1411 * If window is closed can only take segments at
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1412 * window edge, and have to drop data and PUSH from
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1413 * incoming segments. Continue processing, but
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1414 * remember to ack. Otherwise, drop segment
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1415 * and ack.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1416 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1417 if (tp->rcv_wnd == 0 && th->th_seq == tp->rcv_nxt) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1418 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1419 tcpstat.tcps_rcvwinprobe++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1420 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1421 goto dropafterack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1422 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1423 tcpstat.tcps_rcvbyteafterwin += todrop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1424 m_adj(m, -todrop);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1425 tlen -= todrop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1426 tiflags &= ~(TH_PUSH\|TH_FIN);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1427 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1428
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1429 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1430 * If last ACK falls within this segment's sequence numbers,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1431 * record its timestamp.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1432 * Fix from Braden, see Stevens p. 870
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1433 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1434 if (ts_present && TSTMP_GEQ(ts_val, tp->ts_recent) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1435 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1436 tp->ts_recent_age = tcp_now;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1437 tp->ts_recent = ts_val;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1438 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1439
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1440 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1441 * If the RST bit is set examine the state:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1442 * SYN_RECEIVED STATE:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1443 * If passive open, return to LISTEN state.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1444 * If active open, inform user that connection was refused.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1445 * ESTABLISHED, FIN_WAIT_1, FIN_WAIT2, CLOSE_WAIT STATES:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1446 * Inform user that connection was reset, and close tcb.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1447 * CLOSING, LAST_ACK, TIME_WAIT STATES
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1448 * Close the tcb.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1449 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1450 if (tiflags & TH_RST) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1451 #ifndef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1452 if (ti->ti_seq != tp->last_ack_sent)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1453 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1454 if (th->th_seq != tp->last_ack_sent)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1455 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1456 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1457
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1458 switch (tp->t_state) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1459 case TCPS_SYN_RECEIVED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1460 so->so_error = ECONNREFUSED;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1461 goto close;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1462
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1463 case TCPS_ESTABLISHED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1464 case TCPS_FIN_WAIT_1:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1465 case TCPS_FIN_WAIT_2:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1466 case TCPS_CLOSE_WAIT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1467 so->so_error = ECONNRESET;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1468 close:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1469 tp->t_state = TCPS_CLOSED;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1470 tcpstat.tcps_drops++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1471 tp = tcp_close(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1472 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1473 case TCPS_CLOSING:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1474 case TCPS_LAST_ACK:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1475 case TCPS_TIME_WAIT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1476 tp = tcp_close(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1477 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1478 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1479 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1480
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1481 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1482 * If a SYN is in the window, then this is an
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1483 * error and we send an RST and drop the connection.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1484 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1485 if (tiflags & TH_SYN) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1486 tp = tcp_drop(tp, ECONNRESET);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1487 goto dropwithreset;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1488 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1489
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1490 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1491 * If the ACK bit is off we drop the segment and return.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1492 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1493 if ((tiflags & TH_ACK) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1494 if (tp->t_flags & TF_ACKNOW)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1495 goto dropafterack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1496 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1497 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1498 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1499
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1500 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1501 * Ack processing.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1502 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1503 switch (tp->t_state) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1504
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1505 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1506 * In SYN_RECEIVED state, the ack ACKs our SYN, so enter
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1507 * ESTABLISHED state and continue processing.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1508 * The ACK was checked above.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1509 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1510 case TCPS_SYN_RECEIVED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1511 tcpstat.tcps_connects++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1512 soisconnected(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1513 tp->t_state = TCPS_ESTABLISHED;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1514 /* Do window scaling? */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1515 if ((tp->t_flags & (TF_RCVD_SCALE\|TF_REQ_SCALE)) ==
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1516 (TF_RCVD_SCALE\|TF_REQ_SCALE)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1517 tp->snd_scale = tp->requested_s_scale;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1518 tp->rcv_scale = tp->request_r_scale;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1519 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1520 (void) tcp_reass(tp, (struct tcphdr )0, (struct mbuf )0,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1521 &tlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1522 tp->snd_wl1 = th->th_seq - 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1523 /* fall into ... */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1524
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1525 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1526 * In ESTABLISHED state: drop duplicate ACKs; ACK out of range
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1527 * ACKs. If the ack is in the range
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1528 * tp->snd_una < ti->ti_ack <= tp->snd_max
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1529 * then advance tp->snd_una to ti->ti_ack and drop
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1530 * data from the retransmission queue. If this ACK reflects
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1531 * more up to date window information we update our window information.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1532 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1533 case TCPS_ESTABLISHED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1534 case TCPS_FIN_WAIT_1:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1535 case TCPS_FIN_WAIT_2:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1536 case TCPS_CLOSE_WAIT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1537 case TCPS_CLOSING:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1538 case TCPS_LAST_ACK:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1539 case TCPS_TIME_WAIT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1540 if (SEQ_LEQ(th->th_ack, tp->snd_una)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1541 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1542 * Duplicate/old ACK processing.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1543 * Increments t_dupacks:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1544 * Pure duplicate (same seq/ack/window, no data)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1545 * Doesn't affect t_dupacks:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1546 * Data packets.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1547 * Normal window updates (window opens)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1548 * Resets t_dupacks:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1549 * New data ACKed.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1550 * Window shrinks
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1551 * Old ACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1552 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1553 if (tlen)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1554 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1555 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1556 * If we get an old ACK, there is probably packet
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1557 * reordering going on. Be conservative and reset
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1558 * t_dupacks so that we are less agressive in
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1559 * doing a fast retransmit.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1560 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1561 if (th->th_ack != tp->snd_una) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1562 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1563 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1564 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1565 if (tiwin == tp->snd_wnd) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1566 tcpstat.tcps_rcvdupack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1567 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1568 * If we have outstanding data (other than
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1569 * a window probe), this is a completely
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1570 * duplicate ack (ie, window info didn't
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1571 * change), the ack is the biggest we've
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1572 * seen and we've seen exactly our rexmt
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1573 * threshhold of them, assume a packet
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1574 * has been dropped and retransmit it.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1575 * Kludge snd_nxt & the congestion
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1576 * window so we send only this one
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1577 * packet.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1578 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1579 * We know we're losing at the current
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1580 * window size so do congestion avoidance
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1581 * (set ssthresh to half the current window
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1582 * and pull our congestion window back to
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1583 * the new ssthresh).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1584 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1585 * Dup acks mean that packets have left the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1586 * network (they're now cached at the receiver)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1587 * so bump cwnd by the amount in the receiver
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1588 * to keep a constant cwnd packets in the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1589 * network.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1590 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1591 if (tp->t_timer[TCPT_REXMT] == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1592 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1593 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1594 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1595 * In FACK, can enter fast rec. if the receiver
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1596 * reports a reass. queue longer than 3 segs.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1597 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1598 else if (++tp->t_dupacks == tcprexmtthresh \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1599 ((SEQ_GT(tp->snd_fack, tcprexmtthresh *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1600 tp->t_maxseg + tp->snd_una)) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1601 SEQ_GT(tp->snd_una, tp->snd_last))) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1602 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1603 else if (++tp->t_dupacks == tcprexmtthresh) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1604 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1605 tcp_seq onxt = tp->snd_nxt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1606 u_long win =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1607 ulmin(tp->snd_wnd, tp->snd_cwnd) /
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1608 2 / tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1609
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1610 #if defined(TCP_SACK) \|\| defined(TCP_NEWRENO)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1611 if (SEQ_LT(th->th_ack, tp->snd_last)){
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1612 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1613 * False fast retx after
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1614 * timeout. Do not cut window.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1615 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1616 tp->snd_cwnd += tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1617 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1618 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1619 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1620 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1621 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1622 if (win < 2)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1623 win = 2;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1624 tp->snd_ssthresh = win * tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1625 #if defined(TCP_SACK) \|\| defined(TCP_NEWRENO)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1626 tp->snd_last = tp->snd_max;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1627 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1628 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1629 if (!tp->sack_disable) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1630 tp->t_timer[TCPT_REXMT] = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1631 tp->t_rtt = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1632 tcpstat.tcps_sndrexmitfast++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1633 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1634 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1635 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1636 * During FR, snd_cwnd is held
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1637 * constant for FACK.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1638 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1639 tp->snd_cwnd = tp->snd_ssthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1640 tp->t_dupacks = tcprexmtthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1641 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1642 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1643 * tcp_output() will send
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1644 * oldest SACK-eligible rtx.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1645 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1646 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1647 tp->snd_cwnd = tp->snd_ssthresh+
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1648 tp->t_maxseg * tp->t_dupacks;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1649 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1650 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1651 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1652 #endif /* TCP_SACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1653 tp->t_timer[TCPT_REXMT] = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1654 tp->t_rtt = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1655 tp->snd_nxt = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1656 tp->snd_cwnd = tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1657 tcpstat.tcps_sndrexmitfast++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1658 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1659
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1660 tp->snd_cwnd = tp->snd_ssthresh +
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1661 tp->t_maxseg * tp->t_dupacks;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1662 if (SEQ_GT(onxt, tp->snd_nxt))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1663 tp->snd_nxt = onxt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1664 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1665 } else if (tp->t_dupacks > tcprexmtthresh) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1666 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1667 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1668 * while (awnd < cwnd)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1669 * sendsomething();
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1670 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1671 if (!tp->sack_disable) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1672 if (tp->snd_awnd < tp->snd_cwnd)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1673 tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1674 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1675 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1676 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1677 tp->snd_cwnd += tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1678 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1679 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1680 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1681 } else if (tiwin < tp->snd_wnd) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1682 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1683 * The window was retracted! Previous dup
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1684 * ACKs may have been due to packets arriving
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1685 * after the shrunken window, not a missing
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1686 * packet, so play it safe and reset t_dupacks
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1687 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1688 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1689 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1690 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1691 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1692 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1693 * If the congestion window was inflated to account
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1694 * for the other side's cached packets, retract it.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1695 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1696 #ifdef TCP_NEWRENO
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1697 if (tp->t_dupacks >= tcprexmtthresh && !tcp_newreno(tp, th)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1698 /* Out of fast recovery */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1699 tp->snd_cwnd = tp->snd_ssthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1700 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1701 * Window inflation should have left us with approx.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1702 * snd_ssthresh outstanding data. But in case we
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1703 * would be inclined to send a burst, better to do
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1704 * it via the slow start mechanism.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1705 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1706 if (tcp_seq_subtract(tp->snd_max, th->th_ack) <
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1707 tp->snd_ssthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1708 tp->snd_cwnd = tcp_seq_subtract(tp->snd_max,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1709 th->th_ack) + tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1710 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1711 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1712 #elif defined(TCP_SACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1713 if (!tp->sack_disable) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1714 if (tp->t_dupacks >= tcprexmtthresh) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1715 /* Check for a partial ACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1716 if (tcp_sack_partialack(tp, th)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1717 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1718 /* Force call to tcp_output */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1719 if (tp->snd_awnd < tp->snd_cwnd)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1720 needoutput = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1721 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1722 tp->snd_cwnd += tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1723 needoutput = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1724 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1725 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1726 /* Out of fast recovery */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1727 tp->snd_cwnd = tp->snd_ssthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1728 if (tcp_seq_subtract(tp->snd_max,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1729 th->th_ack) < tp->snd_ssthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1730 tp->snd_cwnd =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1731 tcp_seq_subtract(tp->snd_max,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1732 th->th_ack) + tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1733 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1734 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1735 if (SEQ_GT(th->th_ack, tp->snd_fack))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1736 tp->snd_fack = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1737 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1738 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1739 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1740 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1741 if (tp->t_dupacks >= tcprexmtthresh &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1742 !tcp_newreno(tp, th)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1743 /* Out of fast recovery */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1744 tp->snd_cwnd = tp->snd_ssthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1745 if (tcp_seq_subtract(tp->snd_max, th->th_ack) <
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1746 tp->snd_ssthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1747 tp->snd_cwnd =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1748 tcp_seq_subtract(tp->snd_max,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1749 th->th_ack) + tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1750 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1751 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1752 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1753 #else /* else neither TCP_NEWRENO nor TCP_SACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1754 if (tp->t_dupacks >= tcprexmtthresh &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1755 tp->snd_cwnd > tp->snd_ssthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1756 tp->snd_cwnd = tp->snd_ssthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1757 tp->t_dupacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1758 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1759 if (SEQ_GT(th->th_ack, tp->snd_max)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1760 tcpstat.tcps_rcvacktoomuch++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1761 goto dropafterack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1762 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1763 acked = th->th_ack - tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1764 tcpstat.tcps_rcvackpack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1765 tcpstat.tcps_rcvackbyte += acked;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1766
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1767 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1768 * If we have a timestamp reply, update smoothed
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1769 * round trip time. If no timestamp is present but
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1770 * transmit timer is running and timed sequence
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1771 * number was acked, update smoothed round trip time.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1772 * Since we now have an rtt measurement, cancel the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1773 * timer backoff (cf., Phil Karn's retransmit alg.).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1774 * Recompute the initial retransmit timer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1775 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1776 if (ts_present)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1777 tcp_xmit_timer(tp, tcp_now-ts_ecr+1);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1778 else if (tp->t_rtt && SEQ_GT(th->th_ack, tp->t_rtseq))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1779 tcp_xmit_timer(tp,tp->t_rtt);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1780
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1781 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1782 * If all outstanding data is acked, stop retransmit
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1783 * timer and remember to restart (more output or persist).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1784 * If there is more data to be acked, restart retransmit
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1785 * timer, using current (possibly backed-off) value.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1786 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1787 if (th->th_ack == tp->snd_max) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1788 tp->t_timer[TCPT_REXMT] = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1789 needoutput = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1790 } else if (tp->t_timer[TCPT_PERSIST] == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1791 tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1792 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1793 * When new data is acked, open the congestion window.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1794 * If the window gives us less than ssthresh packets
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1795 * in flight, open exponentially (maxseg per packet).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1796 * Otherwise open linearly: maxseg per window
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1797 * (maxseg^2 / cwnd per packet).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1798 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1799 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1800 register u_int cw = tp->snd_cwnd;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1801 register u_int incr = tp->t_maxseg;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1802
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1803 if (cw > tp->snd_ssthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1804 incr = incr * incr / cw;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1805 #if defined (TCP_NEWRENO) \|\| defined (TCP_SACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1806 if (SEQ_GEQ(th->th_ack, tp->snd_last))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1807 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1808 tp->snd_cwnd = min(cw + incr, TCP_MAXWIN<<tp->snd_scale);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1809 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1810 ND6_HINT(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1811 if (acked > so->so_snd.sb_cc) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1812 tp->snd_wnd -= so->so_snd.sb_cc;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1813 sbdrop(&so->so_snd, (int)so->so_snd.sb_cc);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1814 ourfinisacked = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1815 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1816 sbdrop(&so->so_snd, acked);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1817 tp->snd_wnd -= acked;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1818 ourfinisacked = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1819 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1820 if (sb_notify(&so->so_snd))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1821 sowwakeup(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1822 tp->snd_una = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1823 if (SEQ_LT(tp->snd_nxt, tp->snd_una))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1824 tp->snd_nxt = tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1825 #if defined (TCP_SACK) && defined (TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1826 if (SEQ_GT(tp->snd_una, tp->snd_fack))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1827 tp->snd_fack = tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1828 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1829
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1830 switch (tp->t_state) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1831
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1832 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1833 * In FIN_WAIT_1 STATE in addition to the processing
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1834 * for the ESTABLISHED state if our FIN is now acknowledged
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1835 * then enter FIN_WAIT_2.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1836 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1837 case TCPS_FIN_WAIT_1:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1838 if (ourfinisacked) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1839 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1840 * If we can't receive any more
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1841 * data, then closing user can proceed.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1842 * Starting the timer is contrary to the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1843 * specification, but if we don't get a FIN
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1844 * we'll hang forever.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1845 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1846 if (so->so_state & SS_CANTRCVMORE) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1847 soisdisconnected(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1848 tp->t_timer[TCPT_2MSL] = tcp_maxidle;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1849 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1850 tp->t_state = TCPS_FIN_WAIT_2;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1851 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1852 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1853
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1854 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1855 * In CLOSING STATE in addition to the processing for
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1856 * the ESTABLISHED state if the ACK acknowledges our FIN
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1857 * then enter the TIME-WAIT state, otherwise ignore
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1858 * the segment.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1859 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1860 case TCPS_CLOSING:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1861 if (ourfinisacked) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1862 tp->t_state = TCPS_TIME_WAIT;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1863 tcp_canceltimers(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1864 tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1865 soisdisconnected(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1866 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1867 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1868
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1869 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1870 * In LAST_ACK, we may still be waiting for data to drain
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1871 * and/or to be acked, as well as for the ack of our FIN.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1872 * If our FIN is now acknowledged, delete the TCB,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1873 * enter the closed state and return.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1874 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1875 case TCPS_LAST_ACK:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1876 if (ourfinisacked) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1877 tp = tcp_close(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1878 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1879 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1880 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1881
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1882 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1883 * In TIME_WAIT state the only thing that should arrive
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1884 * is a retransmission of the remote FIN. Acknowledge
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1885 * it and restart the finack timer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1886 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1887 case TCPS_TIME_WAIT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1888 tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1889 goto dropafterack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1890 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1891 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1892
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1893 step6:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1894 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1895 * Update window information.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1896 * Don't look at window if no ACK: TAC's send garbage on first SYN.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1897 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1898 if ((tiflags & TH_ACK) && (SEQ_LT(tp->snd_wl1, th->th_seq) \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1899 (tp->snd_wl1 == th->th_seq && SEQ_LT(tp->snd_wl2, th->th_ack)) \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1900 (tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1901 /* keep track of pure window updates */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1902 if (tlen == 0 &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1903 tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1904 tcpstat.tcps_rcvwinupd++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1905 tp->snd_wnd = tiwin;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1906 tp->snd_wl1 = th->th_seq;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1907 tp->snd_wl2 = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1908 if (tp->snd_wnd > tp->max_sndwnd)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1909 tp->max_sndwnd = tp->snd_wnd;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1910 needoutput = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1911 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1912
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1913 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1914 * Process segments with URG.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1915 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1916 if ((tiflags & TH_URG) && th->th_urp &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1917 TCPS_HAVERCVDFIN(tp->t_state) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1918 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1919 * This is a kludge, but if we receive and accept
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1920 * random urgent pointers, we'll crash in
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1921 * soreceive. It's hard to imagine someone
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1922 * actually wanting to send this much urgent data.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1923 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1924 if (th->th_urp + so->so_rcv.sb_cc > sb_max) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1925 th->th_urp = 0; /* XXX */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1926 tiflags &= ~TH_URG; /* XXX */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1927 goto dodata; /* XXX */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1928 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1929 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1930 * If this segment advances the known urgent pointer,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1931 * then mark the data stream. This should not happen
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1932 * in CLOSE_WAIT, CLOSING, LAST_ACK or TIME_WAIT STATES since
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1933 * a FIN has been received from the remote side.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1934 * In these states we ignore the URG.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1935 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1936 * According to RFC961 (Assigned Protocols),
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1937 * the urgent pointer points to the last octet
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1938 * of urgent data. We continue, however,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1939 * to consider it to indicate the first octet
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1940 * of data past the urgent section as the original
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1941 * spec states (in one of two places).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1942 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1943 if (SEQ_GT(th->th_seq+th->th_urp, tp->rcv_up)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1944 tp->rcv_up = th->th_seq + th->th_urp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1945 so->so_oobmark = so->so_rcv.sb_cc +
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1946 (tp->rcv_up - tp->rcv_nxt) - 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1947 if (so->so_oobmark == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1948 so->so_state \|= SS_RCVATMARK;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1949 sohasoutofband(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1950 tp->t_oobflags &= ~(TCPOOB_HAVEDATA \| TCPOOB_HADDATA);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1951 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1952 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1953 * Remove out of band data so doesn't get presented to user.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1954 * This can happen independent of advancing the URG pointer,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1955 * but if two URG's are pending at once, some out-of-band
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1956 * data may creep in... ick.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1957 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1958 if (th->th_urp <= (u_int16_t) tlen
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1959 #ifdef SO_OOBINLINE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1960 && (so->so_options & SO_OOBINLINE) == 0
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1961 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1962 )
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1963 tcp_pulloutofband(so, th->th_urp, m, hdroptlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1964 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1965 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1966 * If no out of band data is expected,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1967 * pull receive urgent pointer along
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1968 * with the receive window.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1969 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1970 if (SEQ_GT(tp->rcv_nxt, tp->rcv_up))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1971 tp->rcv_up = tp->rcv_nxt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1972 dodata: /* XXX */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1973
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1974 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1975 * Process the segment text, merging it into the TCP sequencing queue,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1976 * and arranging for acknowledgment of receipt if necessary.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1977 * This process logically involves adjusting tp->rcv_wnd as data
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1978 * is presented to the user (this happens in tcp_usrreq.c,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1979 * case PRU_RCVD). If a FIN has already been received on this
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1980 * connection then we just ignore the text.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1981 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1982 if ((tlen \|\| (tiflags & TH_FIN)) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1983 TCPS_HAVERCVDFIN(tp->t_state) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1984 if (th->th_seq == tp->rcv_nxt && tp->segq.lh_first == NULL &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1985 tp->t_state == TCPS_ESTABLISHED) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1986 if (th->th_flags & TH_PUSH)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1987 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1988 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1989 tp->t_flags \|= TF_DELACK;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1990 tp->rcv_nxt += tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1991 tiflags = th->th_flags & TH_FIN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1992 tcpstat.tcps_rcvpack++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1993 tcpstat.tcps_rcvbyte += tlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1994 ND6_HINT(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1995 m_adj(m, hdroptlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1996 sbappend(&so->so_rcv, m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1997 sorwakeup(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1998 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	1999 m_adj(m, hdroptlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2000 tiflags = tcp_reass(tp, th, m, &tlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2001 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2002 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2003 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2004 if (!tp->sack_disable)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2005 tcp_update_sack_list(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2006 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2007
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2008 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2009 * variable len never referenced again in modern BSD,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2010 * so why bother computing it ??
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2011 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2012 #if 0
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2013 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2014 * Note the amount of data that peer has sent into
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2015 * our window, in order to estimate the sender's
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2016 * buffer size.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2017 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2018 len = so->so_rcv.sb_hiwat - (tp->rcv_adv - tp->rcv_nxt);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2019 #endif /* 0 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2020 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2021 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2022 tiflags &= ~TH_FIN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2023 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2024
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2025 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2026 * If FIN is received ACK the FIN and let the user know
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2027 * that the connection is closing. Ignore a FIN received before
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2028 * the connection is fully established.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2029 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2030 if ((tiflags & TH_FIN) && TCPS_HAVEESTABLISHED(tp->t_state)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2031 if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2032 socantrcvmore(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2033 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2034 tp->rcv_nxt++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2035 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2036 switch (tp->t_state) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2037
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2038 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2039 * In ESTABLISHED STATE enter the CLOSE_WAIT state.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2040 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2041 case TCPS_ESTABLISHED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2042 tp->t_state = TCPS_CLOSE_WAIT;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2043 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2044
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2045 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2046 * If still in FIN_WAIT_1 STATE FIN has not been acked so
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2047 * enter the CLOSING state.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2048 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2049 case TCPS_FIN_WAIT_1:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2050 tp->t_state = TCPS_CLOSING;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2051 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2052
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2053 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2054 * In FIN_WAIT_2 state enter the TIME_WAIT state,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2055 * starting the time-wait timer, turning off the other
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2056 * standard timers.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2057 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2058 case TCPS_FIN_WAIT_2:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2059 tp->t_state = TCPS_TIME_WAIT;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2060 tcp_canceltimers(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2061 tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2062 soisdisconnected(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2063 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2064
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2065 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2066 * In TIME_WAIT state restart the 2 MSL time_wait timer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2067 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2068 case TCPS_TIME_WAIT:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2069 tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2070 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2071 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2072 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2073 if (so->so_options & SO_DEBUG) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2074 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2075 if (tp->pf == PF_INET6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2076 tcp_trace(TA_INPUT, ostate, tp, (caddr_t) &tcp_saveti6, 0, tlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2077 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2078 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2079 tcp_trace(TA_INPUT, ostate, tp, (caddr_t) &tcp_saveti, 0, tlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2080 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2081
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2082 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2083 * Return any desired output.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2084 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2085 if (needoutput \|\| (tp->t_flags & TF_ACKNOW)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2086 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2087 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2088 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2089
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2090 dropafterack:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2091 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2092 * Generate an ACK dropping incoming segment if it occupies
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2093 * sequence space, where the ACK reflects our state.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2094 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2095 if (tiflags & TH_RST)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2096 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2097 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2098 tp->t_flags \|= TF_ACKNOW;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2099 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2100 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2101
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2102 dropwithreset:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2103 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2104 * Generate a RST, dropping incoming segment.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2105 * Make ACK acceptable to originator of segment.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2106 * Don't bother to respond if destination was broadcast/multicast.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2107 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2108 if ((tiflags & TH_RST) \|\| m->m_flags & (M_BCAST\|M_MCAST))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2109 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2110 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2111 if (is_ipv6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2112 /* For following calls to tcp_respond */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2113 ti = mtod(m, struct tcpiphdr *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2114 if (IN6_IS_ADDR_MULTICAST(&ipv6->ip6_dst))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2115 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2116 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2117 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2118 if (IN_MULTICAST(ti->ti_dst.s_addr))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2119 goto drop;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2120 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2121 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2122 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2123 if (tiflags & TH_ACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2124 tcp_respond(tp, (caddr_t) ti, m, (tcp_seq)0, th->th_ack, TH_RST);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2125 else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2126 if (tiflags & TH_SYN)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2127 tlen++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2128 tcp_respond(tp, (caddr_t) ti, m, th->th_seq+tlen, (tcp_seq)0,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2129 TH_RST\|TH_ACK);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2130 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2131 /* destroy temporarily created socket */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2132 if (dropsocket)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2133 (void) soabort(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2134 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2135
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2136 drop:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2137 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2138 * Drop space held by incoming segment and return.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2139 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2140 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2141 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2142 if (tp->pf == PF_INET6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2143 tcp_trace(TA_DROP, ostate, tp, (caddr_t) &tcp_saveti6, 0, tlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2144 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2145 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2146 tcp_trace(TA_DROP, ostate, tp, (caddr_t) &tcp_saveti, 0, tlen);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2147 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2148
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2149 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2150 /* destroy temporarily created socket */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2151 if (dropsocket)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2152 (void) soabort(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2153 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2154 #ifndef TUBA_INCLUDE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2155 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2156
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2157 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2158 tcp_dooptions(tp, cp, cnt, th, ts_present, ts_val, ts_ecr)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2159 struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2160 u_char *cp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2161 int cnt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2162 struct tcphdr *th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2163 int *ts_present;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2164 u_int32_t ts_val, ts_ecr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2165 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2166 u_int16_t mss = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2167 int opt, optlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2168
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2169 for (; cnt > 0; cnt -= optlen, cp += optlen) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2170 opt = cp[0];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2171 if (opt == TCPOPT_EOL)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2172 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2173 if (opt == TCPOPT_NOP)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2174 optlen = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2175 else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2176 optlen = cp[1];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2177 if (optlen <= 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2178 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2179 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2180 switch (opt) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2181
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2182 default:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2183 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2184
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2185 case TCPOPT_MAXSEG:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2186 if (optlen != TCPOLEN_MAXSEG)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2187 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2188 if (!(th->th_flags & TH_SYN))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2189 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2190 bcopy((char ) cp + 2, (char ) &mss, sizeof(mss));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2191 NTOHS(mss);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2192 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2193
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2194 case TCPOPT_WINDOW:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2195 if (optlen != TCPOLEN_WINDOW)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2196 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2197 if (!(th->th_flags & TH_SYN))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2198 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2199 tp->t_flags \|= TF_RCVD_SCALE;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2200 tp->requested_s_scale = min(cp[2], TCP_MAX_WINSHIFT);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2201 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2202
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2203 case TCPOPT_TIMESTAMP:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2204 if (optlen != TCPOLEN_TIMESTAMP)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2205 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2206 *ts_present = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2207 bcopy((char )cp + 2, (char ) ts_val, sizeof(*ts_val));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2208 NTOHL(*ts_val);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2209 bcopy((char )cp + 6, (char ) ts_ecr, sizeof(*ts_ecr));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2210 NTOHL(*ts_ecr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2211
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2212 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2213 * A timestamp received in a SYN makes
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2214 * it ok to send timestamp requests and replies.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2215 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2216 if (th->th_flags & TH_SYN) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2217 tp->t_flags \|= TF_RCVD_TSTMP;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2218 tp->ts_recent = *ts_val;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2219 tp->ts_recent_age = tcp_now;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2220 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2221 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2222
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2223 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2224 case TCPOPT_SACK_PERMITTED:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2225 if (tp->sack_disable \|\| optlen!=TCPOLEN_SACK_PERMITTED)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2226 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2227 if (th->th_flags & TH_SYN)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2228 /* MUST only be set on SYN */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2229 tp->t_flags \|= TF_SACK_PERMIT;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2230 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2231 case TCPOPT_SACK:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2232 if (tcp_sack_option(tp, th, cp, optlen))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2233 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2234 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2235 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2236 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2237 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2238 /* Update t_maxopd and t_maxseg after all options are processed */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2239 if (th->th_flags & TH_SYN)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2240 (void) tcp_mss(tp, mss); /* sets t_maxseg */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2241 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2242
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2243 #if defined(TCP_SACK) \|\| defined(TCP_NEWRENO)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2244 u_long
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2245 tcp_seq_subtract(a, b)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2246 u_long a, b;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2247 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2248 return ((long)(a - b));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2249 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2250 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2251
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2252
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2253 #ifdef TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2254 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2255 * This function is called upon receipt of new valid data (while not in header
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2256 * prediction mode), and it updates the ordered list of sacks.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2257 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2258 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2259 tcp_update_sack_list(tp)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2260 struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2261 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2262 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2263 * First reported block MUST be the most recent one. Subsequent
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2264 * blocks SHOULD be in the order in which they arrived at the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2265 * receiver. These two conditions make the implementation fully
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2266 * compliant with RFC 2018.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2267 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2268 int i, j = 0, count = 0, lastpos = -1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2269 struct sackblk sack, firstsack, temp[MAX_SACK_BLKS];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2270
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2271 /* First clean up current list of sacks */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2272 for (i = 0; i < tp->rcv_numsacks; i++) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2273 sack = tp->sackblks[i];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2274 if (sack.start == 0 && sack.end == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2275 count++; /* count = number of blocks to be discarded */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2276 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2277 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2278 if (SEQ_LEQ(sack.end, tp->rcv_nxt)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2279 tp->sackblks[i].start = tp->sackblks[i].end = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2280 count++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2281 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2282 temp[j].start = tp->sackblks[i].start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2283 temp[j++].end = tp->sackblks[i].end;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2284 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2285 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2286 tp->rcv_numsacks -= count;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2287 if (tp->rcv_numsacks == 0) { /* no sack blocks currently (fast path) */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2288 tcp_clean_sackreport(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2289 if (SEQ_LT(tp->rcv_nxt, tp->rcv_laststart)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2290 /* ==> need first sack block */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2291 tp->sackblks[0].start = tp->rcv_laststart;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2292 tp->sackblks[0].end = tp->rcv_lastend;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2293 tp->rcv_numsacks = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2294 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2295 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2296 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2297 /* Otherwise, sack blocks are already present. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2298 for (i = 0; i < tp->rcv_numsacks; i++)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2299 tp->sackblks[i] = temp[i]; /* first copy back sack list */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2300 if (SEQ_GEQ(tp->rcv_nxt, tp->rcv_lastend))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2301 return; /* sack list remains unchanged */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2302 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2303 * From here, segment just received should be (part of) the 1st sack.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2304 * Go through list, possibly coalescing sack block entries.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2305 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2306 firstsack.start = tp->rcv_laststart;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2307 firstsack.end = tp->rcv_lastend;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2308 for (i = 0; i < tp->rcv_numsacks; i++) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2309 sack = tp->sackblks[i];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2310 if (SEQ_LT(sack.end, firstsack.start) \|\|
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2311 SEQ_GT(sack.start, firstsack.end))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2312 continue; /* no overlap */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2313 if (sack.start == firstsack.start && sack.end == firstsack.end){
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2314 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2315 * identical block; delete it here since we will
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2316 * move it to the front of the list.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2317 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2318 tp->sackblks[i].start = tp->sackblks[i].end = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2319 lastpos = i; /* last posn with a zero entry */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2320 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2321 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2322 if (SEQ_LEQ(sack.start, firstsack.start))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2323 firstsack.start = sack.start; /* merge blocks */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2324 if (SEQ_GEQ(sack.end, firstsack.end))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2325 firstsack.end = sack.end; /* merge blocks */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2326 tp->sackblks[i].start = tp->sackblks[i].end = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2327 lastpos = i; /* last posn with a zero entry */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2328 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2329 if (lastpos != -1) { /* at least one merge */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2330 for (i = 0, j = 1; i < tp->rcv_numsacks; i++) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2331 sack = tp->sackblks[i];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2332 if (sack.start == 0 && sack.end == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2333 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2334 temp[j++] = sack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2335 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2336 tp->rcv_numsacks = j; /* including first blk (added later) */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2337 for (i = 1; i < tp->rcv_numsacks; i++) /* now copy back */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2338 tp->sackblks[i] = temp[i];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2339 } else { /* no merges -- shift sacks by 1 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2340 if (tp->rcv_numsacks < MAX_SACK_BLKS)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2341 tp->rcv_numsacks++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2342 for (i = tp->rcv_numsacks-1; i > 0; i--)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2343 tp->sackblks[i] = tp->sackblks[i-1];
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2344 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2345 tp->sackblks[0] = firstsack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2346 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2347 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2348
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2349 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2350 * Process the TCP SACK option. Returns 1 if tcp_dooptions() should continue,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2351 * and 0 otherwise, if the option was fine. tp->snd_holes is an ordered list
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2352 * of holes (oldest to newest, in terms of the sequence space).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2353 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2354 int
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2355 tcp_sack_option(tp, th, cp, optlen)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2356 struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2357 struct tcphdr *th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2358 u_char *cp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2359 int optlen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2360 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2361 int tmp_olen;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2362 u_char *tmp_cp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2363 struct sackhole cur, p, *temp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2364
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2365 if (tp->sack_disable)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2366 return 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2367
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2368 /* Note: TCPOLEN_SACK must be 2sizeof(tcp_seq) /
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2369 if (optlen <= 2 \|\| (optlen - 2) % TCPOLEN_SACK != 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2370 return 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2371 tmp_cp = cp + 2;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2372 tmp_olen = optlen - 2;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2373 if (tp->snd_numholes < 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2374 tp->snd_numholes = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2375 if (tp->t_maxseg == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2376 panic("tcp_sack_option"); /* Should never happen */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2377 while (tmp_olen > 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2378 struct sackblk sack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2379
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2380 bcopy((char ) tmp_cp, (char ) &(sack.start), sizeof(tcp_seq));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2381 NTOHL(sack.start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2382 bcopy((char *) tmp_cp + sizeof(tcp_seq),
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2383 (char *) &(sack.end), sizeof(tcp_seq));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2384 NTOHL(sack.end);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2385 tmp_olen -= TCPOLEN_SACK;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2386 tmp_cp += TCPOLEN_SACK;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2387 if (SEQ_LEQ(sack.end, sack.start))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2388 continue; /* bad SACK fields */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2389 if (SEQ_LEQ(sack.end, tp->snd_una))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2390 continue; /* old block */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2391 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2392 /* Updates snd_fack. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2393 if (SEQ_GEQ(sack.end, tp->snd_fack))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2394 tp->snd_fack = sack.end;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2395 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2396 if (SEQ_GT(th->th_ack, tp->snd_una)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2397 if (SEQ_LT(sack.start, th->th_ack))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2398 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2399 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2400 if (SEQ_LT(sack.start, tp->snd_una))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2401 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2402 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2403 if (SEQ_GT(sack.end, tp->snd_max))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2404 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2405 if (tp->snd_holes == 0) { /* first hole */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2406 tp->snd_holes = (struct sackhole *)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2407 malloc(sizeof(struct sackhole), M_PCB, M_NOWAIT);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2408 if (tp->snd_holes == NULL) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2409 /* ENOBUFS, so ignore SACKed block for now*/
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2410 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2411 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2412 cur = tp->snd_holes;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2413 cur->start = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2414 cur->end = sack.start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2415 cur->rxmit = cur->start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2416 cur->next = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2417 tp->snd_numholes = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2418 tp->rcv_lastsack = sack.end;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2419 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2420 * dups is at least one. If more data has been
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2421 * SACKed, it can be greater than one.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2422 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2423 cur->dups = min(tcprexmtthresh,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2424 ((sack.end - cur->end)/tp->t_maxseg));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2425 if (cur->dups < 1)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2426 cur->dups = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2427 continue; /* with next sack block */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2428 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2429 /* Go thru list of holes: p = previous, cur = current */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2430 p = cur = tp->snd_holes;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2431 while (cur) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2432 if (SEQ_LEQ(sack.end, cur->start))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2433 /* SACKs data before the current hole */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2434 break; /* no use going through more holes */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2435 if (SEQ_GEQ(sack.start, cur->end)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2436 /* SACKs data beyond the current hole */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2437 cur->dups++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2438 if ( ((sack.end - cur->end)/tp->t_maxseg) >=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2439 tcprexmtthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2440 cur->dups = tcprexmtthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2441 p = cur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2442 cur = cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2443 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2444 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2445 if (SEQ_LEQ(sack.start, cur->start)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2446 /* Data acks at least the beginning of hole */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2447 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2448 if (SEQ_GT(sack.end, cur->rxmit))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2449 tp->retran_data -=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2450 tcp_seq_subtract(cur->rxmit,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2451 cur->start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2452 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2453 tp->retran_data -=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2454 tcp_seq_subtract(sack.end,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2455 cur->start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2456 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2457 if (SEQ_GEQ(sack.end,cur->end)){
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2458 /* Acks entire hole, so delete hole */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2459 if (p != cur) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2460 p->next = cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2461 free(cur, M_PCB);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2462 cur = p->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2463 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2464 cur=cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2465 free(p, M_PCB);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2466 p = cur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2467 tp->snd_holes = p;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2468 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2469 tp->snd_numholes--;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2470 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2471 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2472 /* otherwise, move start of hole forward */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2473 cur->start = sack.end;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2474 cur->rxmit = max (cur->rxmit, cur->start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2475 p = cur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2476 cur = cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2477 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2478 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2479 /* move end of hole backward */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2480 if (SEQ_GEQ(sack.end, cur->end)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2481 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2482 if (SEQ_GT(cur->rxmit, sack.start))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2483 tp->retran_data -=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2484 tcp_seq_subtract(cur->rxmit,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2485 sack.start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2486 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2487 cur->end = sack.start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2488 cur->rxmit = min (cur->rxmit, cur->end);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2489 cur->dups++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2490 if ( ((sack.end - cur->end)/tp->t_maxseg) >=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2491 tcprexmtthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2492 cur->dups = tcprexmtthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2493 p = cur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2494 cur = cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2495 continue;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2496 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2497 if (SEQ_LT(cur->start, sack.start) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2498 SEQ_GT(cur->end, sack.end)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2499 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2500 * ACKs some data in middle of a hole; need to
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2501 * split current hole
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2502 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2503 temp = (struct sackhole )malloc(sizeof(temp),
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2504 M_PCB,M_NOWAIT);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2505 if (temp == NULL)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2506 continue; /* ENOBUFS */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2507 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2508 if (SEQ_GT(cur->rxmit, sack.end))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2509 tp->retran_data -=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2510 tcp_seq_subtract(sack.end,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2511 sack.start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2512 else if (SEQ_GT(cur->rxmit, sack.start))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2513 tp->retran_data -=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2514 tcp_seq_subtract(cur->rxmit,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2515 sack.start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2516 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2517 temp->next = cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2518 temp->start = sack.end;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2519 temp->end = cur->end;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2520 temp->dups = cur->dups;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2521 temp->rxmit = max (cur->rxmit, temp->start);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2522 cur->end = sack.start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2523 cur->rxmit = min (cur->rxmit, cur->end);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2524 cur->dups++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2525 if ( ((sack.end - cur->end)/tp->t_maxseg) >=
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2526 tcprexmtthresh)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2527 cur->dups = tcprexmtthresh;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2528 cur->next = temp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2529 p = temp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2530 cur = p->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2531 tp->snd_numholes++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2532 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2533 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2534 /* At this point, p points to the last hole on the list */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2535 if (SEQ_LT(tp->rcv_lastsack, sack.start)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2536 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2537 * Need to append new hole at end.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2538 * Last hole is p (and it's not NULL).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2539 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2540 temp = (struct sackhole ) malloc(sizeof(temp),
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2541 M_PCB, M_NOWAIT);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2542 if (temp == NULL)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2543 continue; /* ENOBUFS */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2544 temp->start = tp->rcv_lastsack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2545 temp->end = sack.start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2546 temp->dups = min(tcprexmtthresh,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2547 ((sack.end - sack.start)/tp->t_maxseg));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2548 if (temp->dups < 1)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2549 temp->dups = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2550 temp->rxmit = temp->start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2551 temp->next = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2552 p->next = temp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2553 tp->rcv_lastsack = sack.end;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2554 tp->snd_numholes++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2555 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2556 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2557 #if defined(TCP_SACK) && defined(TCP_FACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2558 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2559 * Update retran_data and snd_awnd. Go through the list of
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2560 * holes. Increment retran_data by (hole->rxmit - hole->start).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2561 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2562 tp->retran_data = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2563 cur = tp->snd_holes;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2564 while (cur) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2565 tp->retran_data += cur->rxmit - cur->start;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2566 cur = cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2567 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2568 tp->snd_awnd = tcp_seq_subtract(tp->snd_nxt, tp->snd_fack) +
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2569 tp->retran_data;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2570 #endif /* TCP_FACK */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2571
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2572 return 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2573 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2574
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2575 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2576 * Delete stale (i.e, cumulatively ack'd) holes. Hole is deleted only if
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2577 * it is completely acked; otherwise, tcp_sack_option(), called from
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2578 * tcp_dooptions(), will fix up the hole.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2579 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2580 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2581 tcp_del_sackholes(tp, th)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2582 struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2583 struct tcphdr *th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2584 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2585 if (!tp->sack_disable && tp->t_state != TCPS_LISTEN) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2586 /* max because this could be an older ack just arrived */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2587 tcp_seq lastack = SEQ_GT(th->th_ack, tp->snd_una) ?
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2588 th->th_ack : tp->snd_una;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2589 struct sackhole *cur = tp->snd_holes;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2590 struct sackhole *prev = cur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2591 while (cur)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2592 if (SEQ_LEQ(cur->end, lastack)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2593 cur = cur->next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2594 free(prev, M_PCB);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2595 prev = cur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2596 tp->snd_numholes--;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2597 } else if (SEQ_LT(cur->start, lastack)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2598 cur->start = lastack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2599 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2600 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2601 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2602 tp->snd_holes = cur;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2603 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2604 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2605
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2606 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2607 * Delete all receiver-side SACK information.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2608 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2609 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2610 tcp_clean_sackreport(tp)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2611 struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2612 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2613 int i;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2614
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2615 tp->rcv_numsacks = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2616 for (i = 0; i < MAX_SACK_BLKS; i++)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2617 tp->sackblks[i].start = tp->sackblks[i].end=0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2618
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2619 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2620
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2621 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2622 * Checks for partial ack. If partial ack arrives, turn off retransmission
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2623 * timer, deflate the window, do not clear tp->t_dupacks, and return 1.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2624 * If the ack advances at least to tp->snd_last, return 0.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2625 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2626 int
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2627 tcp_sack_partialack(tp, th)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2628 struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2629 struct tcphdr *th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2630 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2631 if (SEQ_LT(th->th_ack, tp->snd_last)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2632 /* Turn off retx. timer (will start again next segment) */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2633 tp->t_timer[TCPT_REXMT] = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2634 tp->t_rtt = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2635 #ifndef TCP_FACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2636 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2637 * Partial window deflation. This statement relies on the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2638 * fact that tp->snd_una has not been updated yet. In FACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2639 * hold snd_cwnd constant during fast recovery.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2640 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2641 tp->snd_cwnd -= (th->th_ack - tp->snd_una - tp->t_maxseg);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2642 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2643 return 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2644 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2645 return 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2646 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2647 #endif TCP_SACK
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2648
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2649 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2650 * Pull out of band byte out of a segment so
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2651 * it doesn't appear in the user's data queue.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2652 * It is still reflected in the segment length for
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2653 * sequencing purposes.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2654 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2655 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2656 tcp_pulloutofband(so, urgent, m, off)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2657 struct socket *so;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2658 u_int urgent;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2659 register struct mbuf *m;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2660 int off;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2661 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2662 int cnt = off + urgent - 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2663
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2664 while (cnt >= 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2665 if (m->m_len > cnt) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2666 char *cp = mtod(m, caddr_t) + cnt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2667 struct tcpcb *tp = sototcpcb(so);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2668
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2669 tp->t_iobc = *cp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2670 tp->t_oobflags \|= TCPOOB_HAVEDATA;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2671 bcopy(cp+1, cp, (unsigned)(m->m_len - cnt - 1));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2672 m->m_len--;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2673 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2674 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2675 cnt -= m->m_len;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2676 m = m->m_next;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2677 if (m == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2678 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2679 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2680 panic("tcp_pulloutofband");
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2681 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2682
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2683 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2684 * Collect new round-trip time estimate
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2685 * and update averages and current timeout.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2686 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2687 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2688 tcp_xmit_timer(tp, rtt)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2689 register struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2690 short rtt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2691 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2692 register short delta;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2693 short rttmin;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2694
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2695 tcpstat.tcps_rttupdated++;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2696 --rtt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2697 if (tp->t_srtt != 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2698 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2699 * srtt is stored as fixed point with 3 bits after the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2700 * binary point (i.e., scaled by 8). The following magic
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2701 * is equivalent to the smoothing algorithm in rfc793 with
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2702 * an alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2703 * point). Adjust rtt to origin 0.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2704 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2705 delta = (rtt << 2) - (tp->t_srtt >> TCP_RTT_SHIFT);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2706 if ((tp->t_srtt += delta) <= 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2707 tp->t_srtt = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2708 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2709 * We accumulate a smoothed rtt variance (actually, a
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2710 * smoothed mean difference), then set the retransmit
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2711 * timer to smoothed rtt + 4 times the smoothed variance.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2712 * rttvar is stored as fixed point with 2 bits after the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2713 * binary point (scaled by 4). The following is
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2714 * equivalent to rfc793 smoothing with an alpha of .75
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2715 * (rttvar = rttvar*3/4 + \|delta\| / 4). This replaces
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2716 * rfc793's wired-in beta.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2717 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2718 if (delta < 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2719 delta = -delta;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2720 delta -= (tp->t_rttvar >> TCP_RTTVAR_SHIFT);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2721 if ((tp->t_rttvar += delta) <= 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2722 tp->t_rttvar = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2723 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2724 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2725 * No rtt measurement yet - use the unsmoothed rtt.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2726 * Set the variance to half the rtt (so our first
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2727 * retransmit happens at 3*rtt).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2728 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2729 tp->t_srtt = rtt << (TCP_RTT_SHIFT + 2);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2730 tp->t_rttvar = rtt << (TCP_RTTVAR_SHIFT + 2 - 1);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2731 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2732 tp->t_rtt = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2733 tp->t_rxtshift = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2734
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2735 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2736 * the retransmit should happen at rtt + 4 * rttvar.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2737 * Because of the way we do the smoothing, srtt and rttvar
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2738 * will each average +1/2 tick of bias. When we compute
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2739 * the retransmit timer, we want 1/2 tick of rounding and
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2740 * 1 extra tick because of +-1/2 tick uncertainty in the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2741 * firing of the timer. The bias will give us exactly the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2742 * 1.5 tick we need. But, because the bias is
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2743 * statistical, we have to test that we don't drop below
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2744 * the minimum feasible timer (which is 2 ticks).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2745 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2746 if (tp->t_rttmin > rtt + 2)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2747 rttmin = tp->t_rttmin;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2748 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2749 rttmin = rtt + 2;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2750 TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp), rttmin, TCPTV_REXMTMAX);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2751
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2752 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2753 * We received an ack for a packet that wasn't retransmitted;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2754 * it is probably safe to discard any error indications we've
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2755 * received recently. This isn't quite right, but close enough
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2756 * for now (a route might have failed after we sent a segment,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2757 * and the return path might not be symmetrical).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2758 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2759 tp->t_softerror = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2760 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2761
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2762 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2763 * Determine a reasonable value for maxseg size.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2764 * If the route is known, check route for mtu.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2765 * If none, use an mss that can be handled on the outgoing
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2766 * interface without forcing IP to fragment; if bigger than
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2767 * an mbuf cluster (MCLBYTES), round down to nearest multiple of MCLBYTES
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2768 * to utilize large mbufs. If no route is found, route has no mtu,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2769 * or the destination isn't local, use a default, hopefully conservative
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2770 * size (usually 512 or the default IP max size, but no more than the mtu
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2771 * of the interface), as we can't discover anything about intervening
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2772 * gateways or networks. We also initialize the congestion/slow start
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2773 * window to be a single segment if the destination isn't local.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2774 * While looking at the routing entry, we also initialize other path-dependent
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2775 * parameters from pre-set or cached values in the routing entry.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2776 *
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2777 * Also take into account the space needed for options that we
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2778 * send regularly. Make maxseg shorter by that amount to assure
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2779 * that we can send maxseg amount of data even when the options
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2780 * are present. Store the upper limit of the length of options plus
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2781 * data in maxopd.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2782 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2783 int
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2784 tcp_mss(tp, offer)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2785 register struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2786 u_int offer;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2787 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2788 struct route *ro;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2789 register struct rtentry *rt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2790 struct ifnet *ifp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2791 register int rtt, mss;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2792 u_long bufsize;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2793 struct inpcb *inp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2794 struct socket *so;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2795
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2796 inp = tp->t_inpcb;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2797 ro = &inp->inp_route;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2798 so = inp->inp_socket;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2799
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2800 if ((rt = ro->ro_rt) == (struct rtentry *)0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2801 /* No route yet, so try to acquire one */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2802 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2803 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2804 * Get a new IPv6 route if an IPv6 destination, otherwise, get
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2805 * and IPv4 route (including those pesky IPv4-mapped addresses).
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2806 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2807 bzero(ro,sizeof(struct route_in6));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2808 if (sotopf(so) == AF_INET6) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2809 if (IN6_IS_ADDR_V4MAPPED(&inp->inp_faddr6)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2810 /* Get an IPv4 route. */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2811 ro->ro_dst.sa_family = AF_INET;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2812 ro->ro_dst.sa_len = sizeof(ro->ro_dst);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2813 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2814 inp->inp_faddr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2815 rtalloc(ro);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2816 } else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2817 ro->ro_dst.sa_family = AF_INET6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2818 ro->ro_dst.sa_len = sizeof(struct sockaddr_in6);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2819 ((struct sockaddr_in6 *) &ro->ro_dst)->sin6_addr =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2820 inp->inp_faddr6;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2821 rtalloc(ro);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2822 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2823 } else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2824 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2825 if (inp->inp_faddr.s_addr != INADDR_ANY) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2826 ro->ro_dst.sa_family = AF_INET;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2827 ro->ro_dst.sa_len = sizeof(ro->ro_dst);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2828 satosin(&ro->ro_dst)->sin_addr = inp->inp_faddr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2829 rtalloc(ro);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2830 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2831 if ((rt = ro->ro_rt) == (struct rtentry *)0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2832 tp->t_maxopd = tp->t_maxseg = tcp_mssdflt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2833 return (tcp_mssdflt);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2834 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2835 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2836 ifp = rt->rt_ifp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2837
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2838 #ifdef RTV_MTU /* if route characteristics exist ... */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2839 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2840 * While we're here, check if there's an initial rtt
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2841 * or rttvar. Convert from the route-table units
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2842 * to scaled multiples of the slow timeout timer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2843 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2844 if (tp->t_srtt == 0 && (rtt = rt->rt_rmx.rmx_rtt)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2845 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2846 * XXX the lock bit for MTU indicates that the value
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2847 * is also a minimum value; this is subject to time.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2848 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2849 if (rt->rt_rmx.rmx_locks & RTV_RTT)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2850 TCPT_RANGESET(tp->t_rttmin,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2851 rtt / (RTM_RTTUNIT / PR_SLOWHZ),
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2852 TCPTV_MIN, TCPTV_REXMTMAX);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2853 tp->t_srtt = rtt / (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTT_SCALE));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2854 if (rt->rt_rmx.rmx_rttvar)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2855 tp->t_rttvar = rt->rt_rmx.rmx_rttvar /
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2856 (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTTVAR_SCALE));
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2857 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2858 /* default variation is +- 1 rtt */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2859 tp->t_rttvar =
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2860 tp->t_srtt * TCP_RTTVAR_SCALE / TCP_RTT_SCALE;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2861 TCPT_RANGESET((long) tp->t_rxtcur,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2862 ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2863 tp->t_rttmin, TCPTV_REXMTMAX);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2864 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2865 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2866 * if there's an mtu associated with the route, use it
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2867 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2868 if (rt->rt_rmx.rmx_mtu)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2869 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2870 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2871 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2872 * One may wish to lower MSS to take into account options,
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2873 * especially security-related options.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2874 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2875 if (tp->pf == AF_INET6)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2876 mss = rt->rt_rmx.rmx_mtu - sizeof(struct tcpipv6hdr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2877 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2878 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2879 mss = rt->rt_rmx.rmx_mtu - sizeof(struct tcpiphdr);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2880 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2881 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2882 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2883 else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2884 #endif /* RTV_MTU */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2885 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2886 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2887 * ifp may be null and rmx_mtu may be zero in certain
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2888 * v6 cases (e.g., if ND wasn't able to resolve the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2889 * destination host.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2890 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2891 mss = ifp ? ifp->if_mtu - sizeof(struct tcpiphdr) : 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2892 #ifdef INET6
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2893 if (tp->pf == AF_INET)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2894 #endif /* INET6 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2895 if (!in_localaddr(inp->inp_faddr))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2896 mss = min(mss, tcp_mssdflt);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2897 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2898 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2899 * The current mss, t_maxseg, is initialized to the default value.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2900 * If we compute a smaller value, reduce the current mss.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2901 * If we compute a larger value, return it for use in sending
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2902 * a max seg size option, but don't store it for use
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2903 * unless we received an offer at least that large from peer.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2904 * However, do not accept offers under 32 bytes.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2905 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2906 if (offer)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2907 mss = min(mss, offer);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2908 mss = max(mss, 64); /* sanity - at least max opt. space */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2909 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2910 * maxopd stores the maximum length of data AND options
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2911 * in a segment; maxseg is the amount of data in a normal
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2912 * segment. We need to store this value (maxopd) apart
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2913 * from maxseg, because now every segment carries options
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2914 * and thus we normally have somewhat less data in segments.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2915 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2916 tp->t_maxopd = mss;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2917
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2918 if ((tp->t_flags & (TF_REQ_TSTMP\|TF_NOOPT)) == TF_REQ_TSTMP &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2919 (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2920 mss -= TCPOLEN_TSTAMP_APPA;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2921
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2922 #if (MCLBYTES & (MCLBYTES - 1)) == 0
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2923 if (mss > MCLBYTES)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2924 mss &= ~(MCLBYTES-1);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2925 #else
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2926 if (mss > MCLBYTES)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2927 mss = mss / MCLBYTES * MCLBYTES;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2928 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2929 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2930 * If there's a pipesize, change the socket buffer
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2931 * to that size. Make the socket buffers an integral
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2932 * number of mss units; if the mss is larger than
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2933 * the socket buffer, decrease the mss.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2934 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2935 #ifdef RTV_SPIPE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2936 if ((bufsize = rt->rt_rmx.rmx_sendpipe) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2937 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2938 bufsize = so->so_snd.sb_hiwat;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2939 if (bufsize < mss)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2940 mss = bufsize;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2941 else {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2942 bufsize = roundup(bufsize, mss);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2943 if (bufsize > sb_max)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2944 bufsize = sb_max;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2945 (void)sbreserve(&so->so_snd, bufsize);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2946 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2947 tp->t_maxseg = mss;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2948
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2949 #ifdef RTV_RPIPE
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2950 if ((bufsize = rt->rt_rmx.rmx_recvpipe) == 0)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2951 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2952 bufsize = so->so_rcv.sb_hiwat;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2953 if (bufsize > mss) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2954 bufsize = roundup(bufsize, mss);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2955 if (bufsize > sb_max)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2956 bufsize = sb_max;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2957 (void)sbreserve(&so->so_rcv, bufsize);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2958 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2959 tp->snd_cwnd = mss;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2960
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2961 #ifdef RTV_SSTHRESH
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2962 if (rt->rt_rmx.rmx_ssthresh) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2963 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2964 * There's some sort of gateway or interface
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2965 * buffer limit on the path. Use this to set
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2966 * the slow start threshhold, but set the
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2967 * threshold to no less than 2*mss.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2968 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2969 tp->snd_ssthresh = max(2 * mss, rt->rt_rmx.rmx_ssthresh);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2970 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2971 #endif /* RTV_MTU */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2972 return (mss);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2973 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2974 #endif /* TUBA_INCLUDE */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2975
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2976 #if defined(TCP_NEWRENO) \|\| defined (TCP_SACK)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2977 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2978 * Checks for partial ack. If partial ack arrives, force the retransmission
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2979 * of the next unacknowledged segment, do not clear tp->t_dupacks, and return
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2980 * 1. By setting snd_nxt to ti_ack, this forces retransmission timer to
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2981 * be started again. If the ack advances at least to tp->snd_last, return 0.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2982 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2983 int
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2984 tcp_newreno(tp, th)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2985 struct tcpcb *tp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2986 struct tcphdr *th;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2987 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2988 if (SEQ_LT(th->th_ack, tp->snd_last)) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2989 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2990 * snd_una has not been updated and the socket send buffer
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2991 * not yet drained of the acked data, so we have to leave
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2992 * snd_una as it was to get the correct data offset in
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2993 * tcp_output().
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2994 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2995 tcp_seq onxt = tp->snd_nxt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2996 u_long ocwnd = tp->snd_cwnd;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2997 tp->t_timer[TCPT_REXMT] = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2998 tp->t_rtt = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	2999 tp->snd_nxt = th->th_ack;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3000 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3001 * Set snd_cwnd to one segment beyond acknowledged offset
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3002 * (tp->snd_una not yet updated when this function is called)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3003 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3004 tp->snd_cwnd = tp->t_maxseg + (th->th_ack - tp->snd_una);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3005 (void) tcp_output(tp);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3006 tp->snd_cwnd = ocwnd;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3007 if (SEQ_GT(onxt, tp->snd_nxt))
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3008 tp->snd_nxt = onxt;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3009 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3010 * Partial window deflation. Relies on fact that tp->snd_una
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3011 * not updated yet.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3012 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3013 tp->snd_cwnd -= (th->th_ack - tp->snd_una - tp->t_maxseg);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3014 return 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3015 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3016 return 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3017 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST jlarmour parents: diff changeset	3018 #endif /* TCP_NEWRENO \|\| TCP_SACK */

Mercurial > ecos-v2_0-branch

annotate packages/net/tcpip/current/src/sys/netinet/tcp_input.c @ 97:ced4577552cd ecos-sw-2000-06-06