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annotate packages/net/bsd_tcpip/current/src/sys/netinet/tcp_subr.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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children d397603b9e4b
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1 //==========================================================================
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2 //
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3 // src/sys/netinet/tcp_subr.c
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4 //
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5 //==========================================================================
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6 //####BSDCOPYRIGHTBEGIN####
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7 //
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8 // -------------------------------------------
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9 //
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10 // Portions of this software may have been derived from OpenBSD,
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11 // FreeBSD or other sources, and are covered by the appropriate
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12 // copyright disclaimers included herein.
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13 //
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14 // Portions created by Red Hat are
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15 // Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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16 //
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17 // -------------------------------------------
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18 //
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19 //####BSDCOPYRIGHTEND####
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20 //==========================================================================
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21
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22 /*
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23 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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24 * The Regents of the University of California. All rights reserved.
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25 *
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26 * Redistribution and use in source and binary forms, with or without
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27 * modification, are permitted provided that the following conditions
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28 * are met:
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29 * 1. Redistributions of source code must retain the above copyright
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30 * notice, this list of conditions and the following disclaimer.
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31 * 2. Redistributions in binary form must reproduce the above copyright
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32 * notice, this list of conditions and the following disclaimer in the
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33 * documentation and/or other materials provided with the distribution.
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34 * 3. All advertising materials mentioning features or use of this software
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35 * must display the following acknowledgement:
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36 * This product includes software developed by the University of
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37 * California, Berkeley and its contributors.
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38 * 4. Neither the name of the University nor the names of its contributors
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39 * may be used to endorse or promote products derived from this software
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40 * without specific prior written permission.
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41 *
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42 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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45 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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52 * SUCH DAMAGE.
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53 *
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54 * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
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55 * $FreeBSD: src/sys/netinet/tcp_subr.c,v 1.73.2.22 2001/08/22 00:59:12 silby Exp $
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56 */
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57
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58 #include <sys/param.h>
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59 #include <sys/malloc.h>
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60 #include <sys/mbuf.h>
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61 #ifdef INET6
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62 #include <sys/domain.h>
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63 #endif
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64 #include <sys/socket.h>
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65 #include <sys/socketvar.h>
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66 #include <sys/protosw.h>
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67
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68 #include <net/route.h>
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69 #include <net/if.h>
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70
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71 #define _IP_VHL
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72 #include <netinet/in.h>
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73 #include <netinet/in_systm.h>
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74 #include <netinet/ip.h>
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75 #ifdef INET6
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76 #include <netinet/ip6.h>
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77 #endif
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78 #include <netinet/in_pcb.h>
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79 #ifdef INET6
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80 #include <netinet6/in6_pcb.h>
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81 #endif
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82 #include <netinet/in_var.h>
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83 #include <netinet/ip_var.h>
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84 #ifdef INET6
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85 #include <netinet6/ip6_var.h>
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86 #endif
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87 #include <netinet/tcp.h>
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88 #include <netinet/tcp_fsm.h>
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89 #include <netinet/tcp_seq.h>
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90 #include <netinet/tcp_timer.h>
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91 #include <netinet/tcp_var.h>
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92 #ifdef INET6
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93 #include <netinet6/tcp6_var.h>
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94 #include <netinet6/ip6protosw.h>
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95 #endif
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96 #include <netinet/tcpip.h>
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97 #ifdef TCPDEBUG
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98 #include <netinet/tcp_debug.h>
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99 #endif
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100
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101 #ifdef IPSEC
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102 #include <netinet6/ipsec.h>
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103 #endif /*IPSEC*/
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104
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105 #include <sys/md5.h>
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106
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107 int tcp_mssdflt = TCP_MSS;
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108
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109 #ifdef INET6
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110 int tcp_v6mssdflt = TCP6_MSS;
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111 #endif
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112
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113 #if 0
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114 static int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
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115 #endif
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116
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117 static int tcp_do_rfc1323 = 1;
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118 static int tcp_do_rfc1644 = 0;
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119 static int tcp_tcbhashsize = 0;
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120 static int do_tcpdrain = 1;
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121 static int icmp_may_rst = 1;
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122 static int tcp_strict_rfc1948 = 0;
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123 static int tcp_isn_reseed_interval = 0;
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124 static void tcp_cleartaocache __P((void));
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125 static void tcp_notify __P((struct inpcb *, int));
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126
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127 /*
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128 * Target size of TCP PCB hash tables. Must be a power of two.
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129 *
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130 * Note that this can be overridden by the kernel environment
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131 * variable net.inet.tcp.tcbhashsize
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132 */
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133 #ifndef TCBHASHSIZE
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134 #define TCBHASHSIZE 512
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135 #endif
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136
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137 /*
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138 * This is the actual shape of what we allocate using the zone
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139 * allocator. Doing it this way allows us to protect both structures
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140 * using the same generation count, and also eliminates the overhead
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141 * of allocating tcpcbs separately. By hiding the structure here,
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142 * we avoid changing most of the rest of the code (although it needs
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143 * to be changed, eventually, for greater efficiency).
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144 */
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145 #define ALIGNMENT 32
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146 #define ALIGNM1 (ALIGNMENT - 1)
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147 struct inp_tp {
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148 union {
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149 struct inpcb inp;
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150 char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1];
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151 } inp_tp_u;
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152 struct tcpcb tcb;
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153 struct callout inp_tp_rexmt, inp_tp_persist, inp_tp_keep, inp_tp_2msl;
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154 struct callout inp_tp_delack;
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155 };
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156 #undef ALIGNMENT
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157 #undef ALIGNM1
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158
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159 /*
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160 * Tcp initialization
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161 */
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162 void
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163 tcp_init()
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164 {
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165 int hashsize = TCBHASHSIZE;
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166
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167 tcp_ccgen = 1;
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168 tcp_cleartaocache();
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169
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170 tcp_delacktime = TCPTV_DELACK;
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171 tcp_keepinit = TCPTV_KEEP_INIT;
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172 tcp_keepidle = TCPTV_KEEP_IDLE;
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173 tcp_keepintvl = TCPTV_KEEPINTVL;
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174 tcp_maxpersistidle = TCPTV_KEEP_IDLE;
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175 tcp_msl = TCPTV_MSL;
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176
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177 LIST_INIT(&tcb);
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178 tcbinfo.listhead = &tcb;
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179 tcp_tcbhashsize = hashsize;
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180 tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask);
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181 tcbinfo.porthashbase = hashinit(hashsize, M_PCB,
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182 &tcbinfo.porthashmask);
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183 tcbinfo.ipi_zone = zinit("tcpcb", sizeof(struct inp_tp), maxsockets,
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184 ZONE_INTERRUPT, 0);
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185 #ifdef INET6
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186 #define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr))
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187 #else /* INET6 */
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188 #define TCP_MINPROTOHDR (sizeof(struct tcpiphdr))
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189 #endif /* INET6 */
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190 if (max_protohdr < TCP_MINPROTOHDR)
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191 max_protohdr = TCP_MINPROTOHDR;
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192 if (max_linkhdr + TCP_MINPROTOHDR > MHLEN)
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193 panic("tcp_init");
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194 #undef TCP_MINPROTOHDR
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195 }
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196
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197 /*
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198 * Fill in the IP and TCP headers for an outgoing packet, given the tcpcb.
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199 * tcp_template used to store this data in mbufs, but we now recopy it out
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200 * of the tcpcb each time to conserve mbufs.
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201 */
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202 void
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203 tcp_fillheaders(tp, ip_ptr, tcp_ptr)
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204 struct tcpcb *tp;
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205 void *ip_ptr;
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206 void *tcp_ptr;
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207 {
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208 struct inpcb *inp = tp->t_inpcb;
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209 struct tcphdr *tcp_hdr = (struct tcphdr *)tcp_ptr;
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210
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211 #ifdef INET6
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212 if ((inp->inp_vflag & INP_IPV6) != 0) {
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213 struct ip6_hdr *ip6;
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214
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215 ip6 = (struct ip6_hdr *)ip_ptr;
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216 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
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217 (inp->in6p_flowinfo & IPV6_FLOWINFO_MASK);
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218 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
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219 (IPV6_VERSION & IPV6_VERSION_MASK);
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220 ip6->ip6_nxt = IPPROTO_TCP;
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221 ip6->ip6_plen = sizeof(struct tcphdr);
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222 ip6->ip6_src = inp->in6p_laddr;
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223 ip6->ip6_dst = inp->in6p_faddr;
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224 tcp_hdr->th_sum = 0;
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225 } else
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226 #endif
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227 {
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228 struct ip *ip = (struct ip *) ip_ptr;
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229
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230 ip->ip_vhl = IP_VHL_BORING;
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231 ip->ip_tos = 0;
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232 ip->ip_len = 0;
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233 ip->ip_id = 0;
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234 ip->ip_off = 0;
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235 ip->ip_ttl = 0;
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236 ip->ip_sum = 0;
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237 ip->ip_p = IPPROTO_TCP;
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238 ip->ip_src = inp->inp_laddr;
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239 ip->ip_dst = inp->inp_faddr;
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240 tcp_hdr->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
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241 htons(sizeof(struct tcphdr) + IPPROTO_TCP));
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242 }
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243
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244 tcp_hdr->th_sport = inp->inp_lport;
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245 tcp_hdr->th_dport = inp->inp_fport;
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246 tcp_hdr->th_seq = 0;
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247 tcp_hdr->th_ack = 0;
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248 tcp_hdr->th_x2 = 0;
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249 tcp_hdr->th_off = 5;
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250 tcp_hdr->th_flags = 0;
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251 tcp_hdr->th_win = 0;
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252 tcp_hdr->th_urp = 0;
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253 }
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254
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255 /*
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256 * Create template to be used to send tcp packets on a connection.
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257 * Allocates an mbuf and fills in a skeletal tcp/ip header. The only
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258 * use for this function is in keepalives, which use tcp_respond.
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259 */
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260 struct tcptemp *
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261 tcp_maketemplate(tp)
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262 struct tcpcb *tp;
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263 {
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264 struct mbuf *m;
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265 struct tcptemp *n;
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266
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267 m = m_get(M_DONTWAIT, MT_HEADER);
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268 if (m == NULL)
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269 return (0);
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270 m->m_len = sizeof(struct tcptemp);
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271 n = mtod(m, struct tcptemp *);
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272
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273 tcp_fillheaders(tp, (void *)&n->tt_ipgen, (void *)&n->tt_t);
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274 return (n);
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275 }
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276
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277 /*
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278 * Send a single message to the TCP at address specified by
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279 * the given TCP/IP header. If m == 0, then we make a copy
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280 * of the tcpiphdr at ti and send directly to the addressed host.
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281 * This is used to force keep alive messages out using the TCP
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282 * template for a connection. If flags are given then we send
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283 * a message back to the TCP which originated the * segment ti,
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284 * and discard the mbuf containing it and any other attached mbufs.
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285 *
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286 * In any case the ack and sequence number of the transmitted
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287 * segment are as specified by the parameters.
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288 *
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289 * NOTE: If m != NULL, then ti must point to *inside* the mbuf.
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290 */
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291 void
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292 tcp_respond(tp, ipgen, th, m, ack, seq, flags)
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293 struct tcpcb *tp;
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294 void *ipgen;
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295 register struct tcphdr *th;
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296 register struct mbuf *m;
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297 tcp_seq ack, seq;
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298 int flags;
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299 {
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300 register int tlen;
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301 int win = 0;
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302 struct route *ro = 0;
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303 struct route sro;
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304 struct ip *ip;
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305 struct tcphdr *nth;
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306 #ifdef INET6
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307 #ifdef NEW_STRUCT_ROUTE
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308 struct route *ro6 = 0;
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309 struct route sro6;
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310 #else
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311 struct route_in6 *ro6 = 0;
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312 struct route_in6 sro6;
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313 #endif
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314 struct ip6_hdr *ip6;
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315 int isipv6;
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316 #endif /* INET6 */
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317 int ipflags = 0;
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318
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319 #ifdef INET6
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320 isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6;
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321 ip6 = ipgen;
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322 #endif /* INET6 */
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323 ip = ipgen;
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324
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325 if (tp) {
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326 if (!(flags & TH_RST)) {
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327 win = sbspace(&tp->t_inpcb->inp_socket->so_rcv);
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328 if (win > (long)TCP_MAXWIN << tp->rcv_scale)
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329 win = (long)TCP_MAXWIN << tp->rcv_scale;
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330 }
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331 #ifdef INET6
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332 if (isipv6)
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333 ro6 = &tp->t_inpcb->in6p_route;
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334 else
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335 #endif /* INET6 */
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336 ro = &tp->t_inpcb->inp_route;
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337 } else {
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338 #ifdef INET6
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339 if (isipv6) {
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340 ro6 = &sro6;
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341 bzero(ro6, sizeof *ro6);
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342 } else
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343 #endif /* INET6 */
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344 {
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345 ro = &sro;
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346 bzero(ro, sizeof *ro);
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347 }
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348 }
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349 if (m == 0) {
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350 m = m_gethdr(M_DONTWAIT, MT_HEADER);
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351 if (m == NULL)
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352 return;
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353 tlen = 0;
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354 m->m_data += max_linkhdr;
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355 #ifdef INET6
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356 if (isipv6) {
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357 bcopy((caddr_t)ip6, mtod(m, caddr_t),
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358 sizeof(struct ip6_hdr));
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359 ip6 = mtod(m, struct ip6_hdr *);
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360 nth = (struct tcphdr *)(ip6 + 1);
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361 } else
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362 #endif /* INET6 */
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363 {
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364 bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
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365 ip = mtod(m, struct ip *);
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366 nth = (struct tcphdr *)(ip + 1);
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367 }
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368 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
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369 flags = TH_ACK;
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370 } else {
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371 m_freem(m->m_next);
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372 m->m_next = 0;
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373 m->m_data = (caddr_t)ipgen;
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374 /* m_len is set later */
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375 tlen = 0;
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376 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
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377 #ifdef INET6
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378 if (isipv6) {
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379 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
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380 nth = (struct tcphdr *)(ip6 + 1);
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381 } else
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382 #endif /* INET6 */
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383 {
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384 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, n_long);
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385 nth = (struct tcphdr *)(ip + 1);
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386 }
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387 if (th != nth) {
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388 /*
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389 * this is usually a case when an extension header
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390 * exists between the IPv6 header and the
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391 * TCP header.
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392 */
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393 nth->th_sport = th->th_sport;
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394 nth->th_dport = th->th_dport;
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395 }
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396 xchg(nth->th_dport, nth->th_sport, n_short);
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397 #undef xchg
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398 }
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399 #ifdef INET6
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400 if (isipv6) {
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401 ip6->ip6_plen = htons((u_short)(sizeof (struct tcphdr) +
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402 tlen));
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403 tlen += sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
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404 } else
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405 #endif
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406 {
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407 tlen += sizeof (struct tcpiphdr);
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408 ip->ip_len = tlen;
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409 ip->ip_ttl = ip_defttl;
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410 }
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411 m->m_len = tlen;
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412 m->m_pkthdr.len = tlen;
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413 m->m_pkthdr.rcvif = (struct ifnet *) 0;
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414 nth->th_seq = htonl(seq);
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415 nth->th_ack = htonl(ack);
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416 nth->th_x2 = 0;
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417 nth->th_off = sizeof (struct tcphdr) >> 2;
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418 nth->th_flags = flags;
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419 if (tp)
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parents:
diff changeset
420 nth->th_win = htons((u_short) (win >> tp->rcv_scale));
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parents:
diff changeset
421 else
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diff changeset
422 nth->th_win = htons((u_short)win);
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parents:
diff changeset
423 nth->th_urp = 0;
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parents:
diff changeset
424 #ifdef INET6
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jlarmour
parents:
diff changeset
425 if (isipv6) {
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parents:
diff changeset
426 nth->th_sum = 0;
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jlarmour
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diff changeset
427 nth->th_sum = in6_cksum(m, IPPROTO_TCP,
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jlarmour
parents:
diff changeset
428 sizeof(struct ip6_hdr),
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parents:
diff changeset
429 tlen - sizeof(struct ip6_hdr));
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diff changeset
430 ip6->ip6_hlim = in6_selecthlim(tp ? tp->t_inpcb : NULL,
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diff changeset
431 ro6 && ro6->ro_rt ?
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diff changeset
432 ro6->ro_rt->rt_ifp :
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diff changeset
433 NULL);
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diff changeset
434 } else
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diff changeset
435 #endif /* INET6 */
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diff changeset
436 {
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diff changeset
437 nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
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438 htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p)));
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439 m->m_pkthdr.csum_flags = CSUM_TCP;
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440 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
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441 }
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diff changeset
442 #ifdef TCPDEBUG
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diff changeset
443 if (tp == NULL || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
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444 tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0);
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diff changeset
445 #endif
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diff changeset
446 #ifdef IPSEC
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diff changeset
447 if (ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL) != 0) {
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diff changeset
448 m_freem(m);
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diff changeset
449 return;
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diff changeset
450 }
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diff changeset
451 #endif
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diff changeset
452 #ifdef INET6
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diff changeset
453 if (isipv6) {
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diff changeset
454 (void)ip6_output(m, NULL, ro6, ipflags, NULL, NULL);
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diff changeset
455 if (ro6 == &sro6 && ro6->ro_rt) {
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diff changeset
456 RTFREE(ro6->ro_rt);
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diff changeset
457 ro6->ro_rt = NULL;
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diff changeset
458 }
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diff changeset
459 } else
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diff changeset
460 #endif /* INET6 */
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diff changeset
461 {
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diff changeset
462 (void) ip_output(m, NULL, ro, ipflags, NULL);
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diff changeset
463 if (ro == &sro && ro->ro_rt) {
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diff changeset
464 RTFREE(ro->ro_rt);
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diff changeset
465 ro->ro_rt = NULL;
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diff changeset
466 }
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diff changeset
467 }
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diff changeset
468 }
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diff changeset
469
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diff changeset
470 /*
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jlarmour
parents:
diff changeset
471 * Create a new TCP control block, making an
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diff changeset
472 * empty reassembly queue and hooking it to the argument
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diff changeset
473 * protocol control block. The `inp' parameter must have
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
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diff changeset
474 * come from the zone allocator set up in tcp_init().
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diff changeset
475 */
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diff changeset
476 struct tcpcb *
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diff changeset
477 tcp_newtcpcb(inp)
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diff changeset
478 struct inpcb *inp;
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diff changeset
479 {
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diff changeset
480 struct inp_tp *it;
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diff changeset
481 register struct tcpcb *tp;
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diff changeset
482 #ifdef INET6
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diff changeset
483 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
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diff changeset
484 #endif /* INET6 */
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diff changeset
485
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diff changeset
486 it = (struct inp_tp *)inp;
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diff changeset
487 tp = &it->tcb;
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diff changeset
488 bzero((char *) tp, sizeof(struct tcpcb));
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diff changeset
489 LIST_INIT(&tp->t_segq);
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diff changeset
490 tp->t_maxseg = tp->t_maxopd =
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diff changeset
491 #ifdef INET6
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diff changeset
492 isipv6 ? tcp_v6mssdflt :
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diff changeset
493 #endif /* INET6 */
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diff changeset
494 tcp_mssdflt;
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diff changeset
495
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diff changeset
496 /* Set up our timeouts. */
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diff changeset
497 callout_init(tp->tt_rexmt = &it->inp_tp_rexmt);
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diff changeset
498 callout_init(tp->tt_persist = &it->inp_tp_persist);
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diff changeset
499 callout_init(tp->tt_keep = &it->inp_tp_keep);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
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diff changeset
500 callout_init(tp->tt_2msl = &it->inp_tp_2msl);
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diff changeset
501 callout_init(tp->tt_delack = &it->inp_tp_delack);
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jlarmour
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diff changeset
502
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jlarmour
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diff changeset
503 if (tcp_do_rfc1323)
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jlarmour
parents:
diff changeset
504 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
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jlarmour
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diff changeset
505 if (tcp_do_rfc1644)
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jlarmour
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diff changeset
506 tp->t_flags |= TF_REQ_CC;
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jlarmour
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diff changeset
507 tp->t_inpcb = inp; /* XXX */
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jlarmour
parents:
diff changeset
508 /*
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jlarmour
parents:
diff changeset
509 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
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jlarmour
parents:
diff changeset
510 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
511 * reasonable initial retransmit time.
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jlarmour
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diff changeset
512 */
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jlarmour
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diff changeset
513 tp->t_srtt = TCPTV_SRTTBASE;
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diff changeset
514 tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
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jlarmour
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diff changeset
515 tp->t_rttmin = TCPTV_MIN;
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jlarmour
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diff changeset
516 tp->t_rxtcur = TCPTV_RTOBASE;
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jlarmour
parents:
diff changeset
517 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
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diff changeset
518 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
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jlarmour
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diff changeset
519 tp->t_rcvtime = ticks;
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jlarmour
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diff changeset
520 /*
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jlarmour
parents:
diff changeset
521 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
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jlarmour
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diff changeset
522 * because the socket may be bound to an IPv6 wildcard address,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
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diff changeset
523 * which may match an IPv4-mapped IPv6 address.
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jlarmour
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diff changeset
524 */
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jlarmour
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diff changeset
525 inp->inp_ip_ttl = ip_defttl;
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diff changeset
526 inp->inp_ppcb = (caddr_t)tp;
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jlarmour
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diff changeset
527 return (tp); /* XXX */
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diff changeset
528 }
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jlarmour
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diff changeset
529
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jlarmour
parents:
diff changeset
530 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
531 * Drop a TCP connection, reporting
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
532 * the specified error. If connection is synchronized,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
533 * then send a RST to peer.
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jlarmour
parents:
diff changeset
534 */
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jlarmour
parents:
diff changeset
535 struct tcpcb *
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jlarmour
parents:
diff changeset
536 tcp_drop(tp, errno)
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jlarmour
parents:
diff changeset
537 register struct tcpcb *tp;
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jlarmour
parents:
diff changeset
538 int errno;
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jlarmour
parents:
diff changeset
539 {
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jlarmour
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diff changeset
540 struct socket *so = tp->t_inpcb->inp_socket;
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jlarmour
parents:
diff changeset
541
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jlarmour
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diff changeset
542 if (TCPS_HAVERCVDSYN(tp->t_state)) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
543 tp->t_state = TCPS_CLOSED;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
544 (void) tcp_output(tp);
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jlarmour
parents:
diff changeset
545 tcpstat.tcps_drops++;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
546 } else
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jlarmour
parents:
diff changeset
547 tcpstat.tcps_conndrops++;
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jlarmour
parents:
diff changeset
548 if (errno == ETIMEDOUT && tp->t_softerror)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
549 errno = tp->t_softerror;
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jlarmour
parents:
diff changeset
550 so->so_error = errno;
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jlarmour
parents:
diff changeset
551 return (tcp_close(tp));
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jlarmour
parents:
diff changeset
552 }
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jlarmour
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diff changeset
553
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
554 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
555 * Close a TCP control block:
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
556 * discard all space held by the tcp
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
557 * discard internet protocol block
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
558 * wake up any sleepers
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
559 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
560 struct tcpcb *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
561 tcp_close(tp)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
562 register struct tcpcb *tp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
563 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
564 register struct tseg_qent *q;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
565 struct inpcb *inp = tp->t_inpcb;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
566 struct socket *so = inp->inp_socket;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
567 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
568 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
569 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
570 register struct rtentry *rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
571 int dosavessthresh;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
572
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
573 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
574 * Make sure that all of our timers are stopped before we
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
575 * delete the PCB.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
576 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
577 callout_stop(tp->tt_rexmt);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
578 callout_stop(tp->tt_persist);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
579 callout_stop(tp->tt_keep);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
580 callout_stop(tp->tt_2msl);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
581 callout_stop(tp->tt_delack);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
582
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
583 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
584 * If we got enough samples through the srtt filter,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
585 * save the rtt and rttvar in the routing entry.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
586 * 'Enough' is arbitrarily defined as the 16 samples.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
587 * 16 samples is enough for the srtt filter to converge
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
588 * to within 5% of the correct value; fewer samples and
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
589 * we could save a very bogus rtt.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
590 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
591 * Don't update the default route's characteristics and don't
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
592 * update anything that the user "locked".
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
593 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
594 if (tp->t_rttupdated >= 16) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
595 register u_long i = 0;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
596 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
597 if (isipv6) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
598 struct sockaddr_in6 *sin6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
599
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
600 if ((rt = inp->in6p_route.ro_rt) == NULL)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
601 goto no_valid_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
602 sin6 = (struct sockaddr_in6 *)rt_key(rt);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
603 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
604 goto no_valid_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
605 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
606 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
607 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
608 if ((rt = inp->inp_route.ro_rt) == NULL ||
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
609 ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
610 == INADDR_ANY)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
611 goto no_valid_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
612
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
613 if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
614 i = tp->t_srtt *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
615 (RTM_RTTUNIT / (hz * TCP_RTT_SCALE));
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
616 if (rt->rt_rmx.rmx_rtt && i)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
617 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
618 * filter this update to half the old & half
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
619 * the new values, converting scale.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
620 * See route.h and tcp_var.h for a
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
621 * description of the scaling constants.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
622 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
623 rt->rt_rmx.rmx_rtt =
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
624 (rt->rt_rmx.rmx_rtt + i) / 2;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
625 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
626 rt->rt_rmx.rmx_rtt = i;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
627 tcpstat.tcps_cachedrtt++;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
628 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
629 if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
630 i = tp->t_rttvar *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
631 (RTM_RTTUNIT / (hz * TCP_RTTVAR_SCALE));
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
632 if (rt->rt_rmx.rmx_rttvar && i)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
633 rt->rt_rmx.rmx_rttvar =
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
634 (rt->rt_rmx.rmx_rttvar + i) / 2;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
635 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
636 rt->rt_rmx.rmx_rttvar = i;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
637 tcpstat.tcps_cachedrttvar++;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
638 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
639 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
640 * The old comment here said:
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
641 * update the pipelimit (ssthresh) if it has been updated
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
642 * already or if a pipesize was specified & the threshhold
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
643 * got below half the pipesize. I.e., wait for bad news
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
644 * before we start updating, then update on both good
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
645 * and bad news.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
646 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
647 * But we want to save the ssthresh even if no pipesize is
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
648 * specified explicitly in the route, because such
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
649 * connections still have an implicit pipesize specified
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
650 * by the global tcp_sendspace. In the absence of a reliable
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
651 * way to calculate the pipesize, it will have to do.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
652 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
653 i = tp->snd_ssthresh;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
654 if (rt->rt_rmx.rmx_sendpipe != 0)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
655 dosavessthresh = (i < rt->rt_rmx.rmx_sendpipe / 2);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
656 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
657 dosavessthresh = (i < so->so_snd.sb_hiwat / 2);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
658 if (((rt->rt_rmx.rmx_locks & RTV_SSTHRESH) == 0 &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
659 i != 0 && rt->rt_rmx.rmx_ssthresh != 0)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
660 || dosavessthresh) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
661 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
662 * convert the limit from user data bytes to
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
663 * packets then to packet data bytes.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
664 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
665 i = (i + tp->t_maxseg / 2) / tp->t_maxseg;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
666 if (i < 2)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
667 i = 2;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
668 i *= (u_long)(tp->t_maxseg +
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
669 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
670 (isipv6 ? sizeof (struct ip6_hdr) +
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
671 sizeof (struct tcphdr) :
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
672 #endif
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
673 sizeof (struct tcpiphdr)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
674 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
675 )
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
676 #endif
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
677 );
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
678 if (rt->rt_rmx.rmx_ssthresh)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
679 rt->rt_rmx.rmx_ssthresh =
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
680 (rt->rt_rmx.rmx_ssthresh + i) / 2;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
681 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
682 rt->rt_rmx.rmx_ssthresh = i;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
683 tcpstat.tcps_cachedssthresh++;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
684 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
685 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
686 rt = inp->inp_route.ro_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
687 if (rt) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
688 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
689 * mark route for deletion if no information is
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
690 * cached.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
691 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
692 if ((tp->t_flags & TF_LQ_OVERFLOW) &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
693 ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0)){
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
694 if (rt->rt_rmx.rmx_rtt == 0)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
695 rt->rt_flags |= RTF_DELCLONE;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
696 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
697 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
698 no_valid_rt:
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
699 /* free the reassembly queue, if any */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
700 while((q = LIST_FIRST(&tp->t_segq)) != NULL) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
701 LIST_REMOVE(q, tqe_q);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
702 m_freem(q->tqe_m);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
703 FREE(q, M_TSEGQ);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
704 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
705 inp->inp_ppcb = NULL;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
706 soisdisconnected(so);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
707 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
708 if (INP_CHECK_SOCKAF(so, AF_INET6))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
709 in6_pcbdetach(inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
710 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
711 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
712 in_pcbdetach(inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
713 tcpstat.tcps_closed++;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
714 return ((struct tcpcb *)0);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
715 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
716
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
717 void
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
718 tcp_drain()
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
719 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
720 if (do_tcpdrain)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
721 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
722 struct inpcb *inpb;
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jlarmour
parents:
diff changeset
723 struct tcpcb *tcpb;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
724 struct tseg_qent *te;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
725
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
726 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
727 * Walk the tcpbs, if existing, and flush the reassembly queue,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
728 * if there is one...
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
729 * XXX: The "Net/3" implementation doesn't imply that the TCP
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
730 * reassembly queue should be flushed, but in a situation
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
731 * where we're really low on mbufs, this is potentially
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
732 * usefull.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
733 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
734 for (inpb = LIST_FIRST(tcbinfo.listhead); inpb;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
735 inpb = LIST_NEXT(inpb, inp_list)) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
736 if ((tcpb = intotcpcb(inpb))) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
737 while ((te = LIST_FIRST(&tcpb->t_segq))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
738 != NULL) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
739 LIST_REMOVE(te, tqe_q);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
740 m_freem(te->tqe_m);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
741 FREE(te, M_TSEGQ);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
742 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
743 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
744 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
745
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
746 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
747 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
748
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
749 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
750 * Notify a tcp user of an asynchronous error;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
751 * store error as soft error, but wake up user
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
752 * (for now, won't do anything until can select for soft error).
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
753 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
754 * Do not wake up user since there currently is no mechanism for
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
755 * reporting soft errors (yet - a kqueue filter may be added).
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
756 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
757 static void
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
758 tcp_notify(inp, error)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
759 struct inpcb *inp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
760 int error;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
761 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
762 struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
763
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
764 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
765 * Ignore some errors if we are hooked up.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
766 * If connection hasn't completed, has retransmitted several times,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
767 * and receives a second error, give up now. This is better
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
768 * than waiting a long time to establish a connection that
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
769 * can never complete.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
770 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
771 if (tp->t_state == TCPS_ESTABLISHED &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
772 (error == EHOSTUNREACH || error == ENETUNREACH ||
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
773 error == EHOSTDOWN)) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
774 return;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
775 } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
776 tp->t_softerror)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
777 tcp_drop(tp, error);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
778 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
779 tp->t_softerror = error;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
780 #if 0
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
781 wakeup((caddr_t) &so->so_timeo);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
782 sorwakeup(so);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
783 sowwakeup(so);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
784 #endif
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
785 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
786
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
787 void
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
788 tcp_ctlinput(cmd, sa, vip)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
789 int cmd;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
790 struct sockaddr *sa;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
791 void *vip;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
792 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
793 struct ip *ip = vip;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
794 struct tcphdr *th;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
795 struct in_addr faddr;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
796 struct inpcb *inp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
797 struct tcpcb *tp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
798 void (*notify) __P((struct inpcb *, int)) = tcp_notify;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
799 tcp_seq icmp_seq;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
800 int s;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
801
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
802 faddr = ((struct sockaddr_in *)sa)->sin_addr;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
803 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
804 return;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
805
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
806 if (cmd == PRC_QUENCH)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
807 notify = tcp_quench;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
808 else if (icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
809 cmd == PRC_UNREACH_PORT) && ip)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
810 notify = tcp_drop_syn_sent;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
811 else if (cmd == PRC_MSGSIZE)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
812 notify = tcp_mtudisc;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
813 else if (PRC_IS_REDIRECT(cmd)) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
814 ip = 0;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
815 notify = in_rtchange;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
816 } else if (cmd == PRC_HOSTDEAD)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
817 ip = 0;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
818 else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
819 return;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
820 if (ip) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
821 s = splnet();
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
822 th = (struct tcphdr *)((caddr_t)ip
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
823 + (IP_VHL_HL(ip->ip_vhl) << 2));
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
824 inp = in_pcblookup_hash(&tcbinfo, faddr, th->th_dport,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
825 ip->ip_src, th->th_sport, 0, NULL);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
826 if (inp != NULL && inp->inp_socket != NULL) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
827 icmp_seq = htonl(th->th_seq);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
828 tp = intotcpcb(inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
829 if (SEQ_GEQ(icmp_seq, tp->snd_una) &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
830 SEQ_LT(icmp_seq, tp->snd_max))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
831 (*notify)(inp, inetctlerrmap[cmd]);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
832 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
833 splx(s);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
834 } else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
835 in_pcbnotifyall(&tcb, faddr, inetctlerrmap[cmd], notify);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
836 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
837
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
838 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
839 void
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
840 tcp6_ctlinput(cmd, sa, d)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
841 int cmd;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
842 struct sockaddr *sa;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
843 void *d;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
844 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
845 struct tcphdr th;
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jlarmour
parents:
diff changeset
846 void (*notify) __P((struct inpcb *, int)) = tcp_notify;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
847 struct ip6_hdr *ip6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
848 struct mbuf *m;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
849 struct ip6ctlparam *ip6cp = NULL;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
850 const struct sockaddr_in6 *sa6_src = NULL;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
851 int off;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
852 struct tcp_portonly {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
853 u_int16_t th_sport;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
854 u_int16_t th_dport;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
855 } *thp;
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jlarmour
parents:
diff changeset
856
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jlarmour
parents:
diff changeset
857 if (sa->sa_family != AF_INET6 ||
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
858 sa->sa_len != sizeof(struct sockaddr_in6))
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jlarmour
parents:
diff changeset
859 return;
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jlarmour
parents:
diff changeset
860
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jlarmour
parents:
diff changeset
861 if (cmd == PRC_QUENCH)
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jlarmour
parents:
diff changeset
862 notify = tcp_quench;
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jlarmour
parents:
diff changeset
863 else if (cmd == PRC_MSGSIZE)
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jlarmour
parents:
diff changeset
864 notify = tcp_mtudisc;
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jlarmour
parents:
diff changeset
865 else if (!PRC_IS_REDIRECT(cmd) &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
866 ((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0))
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jlarmour
parents:
diff changeset
867 return;
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jlarmour
parents:
diff changeset
868
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
869 /* if the parameter is from icmp6, decode it. */
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jlarmour
parents:
diff changeset
870 if (d != NULL) {
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jlarmour
parents:
diff changeset
871 ip6cp = (struct ip6ctlparam *)d;
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jlarmour
parents:
diff changeset
872 m = ip6cp->ip6c_m;
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jlarmour
parents:
diff changeset
873 ip6 = ip6cp->ip6c_ip6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
874 off = ip6cp->ip6c_off;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
875 sa6_src = ip6cp->ip6c_src;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
876 } else {
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jlarmour
parents:
diff changeset
877 m = NULL;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
878 ip6 = NULL;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
879 off = 0; /* fool gcc */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
880 sa6_src = &sa6_any;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
881 }
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jlarmour
parents:
diff changeset
882
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
883 if (ip6) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
884 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
885 * XXX: We assume that when IPV6 is non NULL,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
886 * M and OFF are valid.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
887 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
888
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
889 /* check if we can safely examine src and dst ports */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
890 if (m->m_pkthdr.len < off + sizeof(*thp))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
891 return;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
892
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
893 bzero(&th, sizeof(th));
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
894 m_copydata(m, off, sizeof(*thp), (caddr_t)&th);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
895
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
896 in6_pcbnotify(&tcb, sa, th.th_dport,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
897 (struct sockaddr *)ip6cp->ip6c_src,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
898 th.th_sport, cmd, NULL, notify);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
899 } else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
900 in6_pcbnotify(&tcb, sa, 0, (struct sockaddr *)sa6_src,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
901 0, cmd, NULL, notify);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
902 }
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jlarmour
parents:
diff changeset
903 #endif /* INET6 */
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jlarmour
parents:
diff changeset
904
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
905 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
906 * Following is where TCP initial sequence number generation occurs.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
907 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
908 * There are two places where we must use initial sequence numbers:
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
909 * 1. In SYN-ACK packets.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
910 * 2. In SYN packets.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
911 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
912 * The ISNs in SYN-ACK packets have no monotonicity requirement,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
913 * and should be as unpredictable as possible to avoid the possibility
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
914 * of spoofing and/or connection hijacking. To satisfy this
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
915 * requirement, SYN-ACK ISNs are generated via the arc4random()
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
916 * function. If exact RFC 1948 compliance is requested via sysctl,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
917 * these ISNs will be generated just like those in SYN packets.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
918 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
919 * The ISNs in SYN packets must be monotonic; TIME_WAIT recycling
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
920 * depends on this property. In addition, these ISNs should be
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
921 * unguessable so as to prevent connection hijacking. To satisfy
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
922 * the requirements of this situation, the algorithm outlined in
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
923 * RFC 1948 is used to generate sequence numbers.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
924 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
925 * For more information on the theory of operation, please see
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
926 * RFC 1948.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
927 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
928 * Implementation details:
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
929 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
930 * Time is based off the system timer, and is corrected so that it
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
931 * increases by one megabyte per second. This allows for proper
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
932 * recycling on high speed LANs while still leaving over an hour
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
933 * before rollover.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
934 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
935 * Two sysctls control the generation of ISNs:
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
936 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
937 * net.inet.tcp.isn_reseed_interval controls the number of seconds
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
938 * between seeding of isn_secret. This is normally set to zero,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
939 * as reseeding should not be necessary.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
940 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
941 * net.inet.tcp.strict_rfc1948 controls whether RFC 1948 is followed
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
942 * strictly. When strict compliance is requested, reseeding is
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
943 * disabled and SYN-ACKs will be generated in the same manner as
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
944 * SYNs. Strict mode is disabled by default.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
945 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
946 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
947
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
948 #define ISN_BYTES_PER_SECOND 1048576
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
949
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
950 u_char isn_secret[32];
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
951 int isn_last_reseed;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
952 MD5_CTX isn_ctx;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
953
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
954 tcp_seq
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
955 tcp_new_isn(tp)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
956 struct tcpcb *tp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
957 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
958 u_int32_t md5_buffer[4];
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
959 tcp_seq new_isn;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
960
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
961 /* Use arc4random for SYN-ACKs when not in exact RFC1948 mode. */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
962 if (((tp->t_state == TCPS_LISTEN) || (tp->t_state == TCPS_TIME_WAIT))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
963 && tcp_strict_rfc1948 == 0)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
964 return arc4random();
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
965
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
966 /* Seed if this is the first use, reseed if requested. */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
967 if ((isn_last_reseed == 0) ||
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
968 ((tcp_strict_rfc1948 == 0) && (tcp_isn_reseed_interval > 0) &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
969 (((u_int)isn_last_reseed + (u_int)tcp_isn_reseed_interval*hz)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
970 < (u_int)ticks))) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
971 read_random_unlimited(&isn_secret, sizeof(isn_secret));
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
972 isn_last_reseed = ticks;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
973 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
974
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
975 /* Compute the md5 hash and return the ISN. */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
976 MD5Init(&isn_ctx);
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jlarmour
parents:
diff changeset
977 MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_fport, sizeof(u_short));
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jlarmour
parents:
diff changeset
978 MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_lport, sizeof(u_short));
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jlarmour
parents:
diff changeset
979 #ifdef INET6
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jlarmour
parents:
diff changeset
980 if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) {
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jlarmour
parents:
diff changeset
981 MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->in6p_faddr,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
982 sizeof(struct in6_addr));
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jlarmour
parents:
diff changeset
983 MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->in6p_laddr,
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jlarmour
parents:
diff changeset
984 sizeof(struct in6_addr));
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jlarmour
parents:
diff changeset
985 } else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
986 #endif
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
987 {
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jlarmour
parents:
diff changeset
988 MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_faddr,
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jlarmour
parents:
diff changeset
989 sizeof(struct in_addr));
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jlarmour
parents:
diff changeset
990 MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_laddr,
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jlarmour
parents:
diff changeset
991 sizeof(struct in_addr));
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jlarmour
parents:
diff changeset
992 }
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jlarmour
parents:
diff changeset
993 MD5Update(&isn_ctx, (u_char *) &isn_secret, sizeof(isn_secret));
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jlarmour
parents:
diff changeset
994 MD5Final((u_char *) &md5_buffer, &isn_ctx);
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diff changeset
995 new_isn = (tcp_seq) md5_buffer[0];
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parents:
diff changeset
996 new_isn += ticks * (ISN_BYTES_PER_SECOND / hz);
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jlarmour
parents:
diff changeset
997 return new_isn;
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parents:
diff changeset
998 }
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parents:
diff changeset
999
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parents:
diff changeset
1000 /*
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jlarmour
parents:
diff changeset
1001 * When a source quench is received, close congestion window
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jlarmour
parents:
diff changeset
1002 * to one segment. We will gradually open it again as we proceed.
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parents:
diff changeset
1003 */
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jlarmour
parents:
diff changeset
1004 void
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jlarmour
parents:
diff changeset
1005 tcp_quench(inp, errno)
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jlarmour
parents:
diff changeset
1006 struct inpcb *inp;
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jlarmour
parents:
diff changeset
1007 int errno;
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jlarmour
parents:
diff changeset
1008 {
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jlarmour
parents:
diff changeset
1009 struct tcpcb *tp = intotcpcb(inp);
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jlarmour
parents:
diff changeset
1010
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jlarmour
parents:
diff changeset
1011 if (tp)
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jlarmour
parents:
diff changeset
1012 tp->snd_cwnd = tp->t_maxseg;
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jlarmour
parents:
diff changeset
1013 }
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parents:
diff changeset
1014
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parents:
diff changeset
1015 /*
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jlarmour
parents:
diff changeset
1016 * When a specific ICMP unreachable message is received and the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1017 * connection state is SYN-SENT, drop the connection. This behavior
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1018 * is controlled by the icmp_may_rst sysctl.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
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parents:
diff changeset
1019 */
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jlarmour
parents:
diff changeset
1020 void
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jlarmour
parents:
diff changeset
1021 tcp_drop_syn_sent(inp, errno)
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jlarmour
parents:
diff changeset
1022 struct inpcb *inp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1023 int errno;
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jlarmour
parents:
diff changeset
1024 {
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jlarmour
parents:
diff changeset
1025 struct tcpcb *tp = intotcpcb(inp);
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diff changeset
1026
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jlarmour
parents:
diff changeset
1027 if (tp && tp->t_state == TCPS_SYN_SENT)
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jlarmour
parents:
diff changeset
1028 tcp_drop(tp, errno);
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jlarmour
parents:
diff changeset
1029 }
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jlarmour
parents:
diff changeset
1030
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1031 /*
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jlarmour
parents:
diff changeset
1032 * When `need fragmentation' ICMP is received, update our idea of the MSS
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
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parents:
diff changeset
1033 * based on the new value in the route. Also nudge TCP to send something,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1034 * since we know the packet we just sent was dropped.
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jlarmour
parents:
diff changeset
1035 * This duplicates some code in the tcp_mss() function in tcp_input.c.
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jlarmour
parents:
diff changeset
1036 */
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jlarmour
parents:
diff changeset
1037 void
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1038 tcp_mtudisc(inp, errno)
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jlarmour
parents:
diff changeset
1039 struct inpcb *inp;
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jlarmour
parents:
diff changeset
1040 int errno;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1041 {
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jlarmour
parents:
diff changeset
1042 struct tcpcb *tp = intotcpcb(inp);
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jlarmour
parents:
diff changeset
1043 struct rtentry *rt;
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jlarmour
parents:
diff changeset
1044 struct rmxp_tao *taop;
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jlarmour
parents:
diff changeset
1045 struct socket *so = inp->inp_socket;
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jlarmour
parents:
diff changeset
1046 int offered;
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jlarmour
parents:
diff changeset
1047 int mss;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1048 #ifdef INET6
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jlarmour
parents:
diff changeset
1049 int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0;
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jlarmour
parents:
diff changeset
1050 #endif /* INET6 */
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jlarmour
parents:
diff changeset
1051
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jlarmour
parents:
diff changeset
1052 if (tp) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1053 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1054 if (isipv6)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1055 rt = tcp_rtlookup6(inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1056 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1057 #endif /* INET6 */
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jlarmour
parents:
diff changeset
1058 rt = tcp_rtlookup(inp);
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jlarmour
parents:
diff changeset
1059 if (!rt || !rt->rt_rmx.rmx_mtu) {
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parents:
diff changeset
1060 tp->t_maxopd = tp->t_maxseg =
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1061 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1062 isipv6 ? tcp_v6mssdflt :
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1063 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1064 tcp_mssdflt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1065 return;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1066 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
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diff changeset
1067 taop = rmx_taop(rt->rt_rmx);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1068 offered = taop->tao_mssopt;
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jlarmour
parents:
diff changeset
1069 mss = rt->rt_rmx.rmx_mtu -
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1070 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1071 (isipv6 ?
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1072 sizeof(struct ip6_hdr) + sizeof(struct tcphdr) :
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1073 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1074 sizeof(struct tcpiphdr)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1075 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1076 )
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1077 #endif /* INET6 */
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jlarmour
parents:
diff changeset
1078 ;
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jlarmour
parents:
diff changeset
1079
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jlarmour
parents:
diff changeset
1080 if (offered)
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jlarmour
parents:
diff changeset
1081 mss = min(mss, offered);
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jlarmour
parents:
diff changeset
1082 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1083 * XXX - The above conditional probably violates the TCP
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1084 * spec. The problem is that, since we don't know the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1085 * other end's MSS, we are supposed to use a conservative
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1086 * default. But, if we do that, then MTU discovery will
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1087 * never actually take place, because the conservative
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1088 * default is much less than the MTUs typically seen
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1089 * on the Internet today. For the moment, we'll sweep
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1090 * this under the carpet.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1091 *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1092 * The conservative default might not actually be a problem
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1093 * if the only case this occurs is when sending an initial
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1094 * SYN with options and data to a host we've never talked
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1095 * to before. Then, they will reply with an MSS value which
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1096 * will get recorded and the new parameters should get
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1097 * recomputed. For Further Study.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1098 */
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jlarmour
parents:
diff changeset
1099 if (tp->t_maxopd <= mss)
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jlarmour
parents:
diff changeset
1100 return;
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jlarmour
parents:
diff changeset
1101 tp->t_maxopd = mss;
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jlarmour
parents:
diff changeset
1102
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jlarmour
parents:
diff changeset
1103 if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1104 (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1105 mss -= TCPOLEN_TSTAMP_APPA;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1106 if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC &&
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1107 (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC)
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jlarmour
parents:
diff changeset
1108 mss -= TCPOLEN_CC_APPA;
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jlarmour
parents:
diff changeset
1109 #if (MCLBYTES & (MCLBYTES - 1)) == 0
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1110 if (mss > MCLBYTES)
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jlarmour
parents:
diff changeset
1111 mss &= ~(MCLBYTES-1);
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jlarmour
parents:
diff changeset
1112 #else
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jlarmour
parents:
diff changeset
1113 if (mss > MCLBYTES)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1114 mss = mss / MCLBYTES * MCLBYTES;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1115 #endif
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1116 if (so->so_snd.sb_hiwat < mss)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1117 mss = so->so_snd.sb_hiwat;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1118
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1119 tp->t_maxseg = mss;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1120
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1121 tcpstat.tcps_mturesent++;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1122 tp->t_rtttime = 0;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1123 tp->snd_nxt = tp->snd_una;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1124 tcp_output(tp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1125 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1126 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1127
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1128 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1129 * Look-up the routing entry to the peer of this inpcb. If no route
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1130 * is found and it cannot be allocated the return NULL. This routine
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1131 * is called by TCP routines that access the rmx structure and by tcp_mss
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1132 * to get the interface MTU.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1133 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1134 struct rtentry *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1135 tcp_rtlookup(inp)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1136 struct inpcb *inp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1137 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1138 struct route *ro;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1139 struct rtentry *rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1140
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1141 ro = &inp->inp_route;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1142 rt = ro->ro_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1143 if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1144 /* No route yet, so try to acquire one */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1145 if (inp->inp_faddr.s_addr != INADDR_ANY) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1146 ro->ro_dst.sa_family = AF_INET;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1147 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1148 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1149 inp->inp_faddr;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1150 rtalloc(ro);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1151 rt = ro->ro_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1152 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1153 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1154 return rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1155 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1156
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1157 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1158 struct rtentry *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1159 tcp_rtlookup6(inp)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1160 struct inpcb *inp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1161 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1162 #ifdef NEW_STRUCT_ROUTE
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1163 struct route *ro6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1164 #else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1165 struct route_in6 *ro6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1166 #endif
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1167 struct rtentry *rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1168
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1169 ro6 = &inp->in6p_route;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1170 rt = ro6->ro_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1171 if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1172 /* No route yet, so try to acquire one */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1173 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1174 struct sockaddr_in6 *dst6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1175
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1176 dst6 = (struct sockaddr_in6 *)&ro6->ro_dst;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1177 dst6->sin6_family = AF_INET6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1178 dst6->sin6_len = sizeof(*dst6);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1179 dst6->sin6_addr = inp->in6p_faddr;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1180 rtalloc((struct route *)ro6);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1181 rt = ro6->ro_rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1182 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1183 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1184 return rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1185 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1186 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1187
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1188 #ifdef IPSEC
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1189 /* compute ESP/AH header size for TCP, including outer IP header. */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1190 size_t
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1191 ipsec_hdrsiz_tcp(tp)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1192 struct tcpcb *tp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1193 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1194 struct inpcb *inp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1195 struct mbuf *m;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1196 size_t hdrsiz;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1197 struct ip *ip;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1198 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1199 struct ip6_hdr *ip6;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1200 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1201 struct tcphdr *th;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1202
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1203 if ((tp == NULL) || ((inp = tp->t_inpcb) == NULL))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1204 return 0;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1205 MGETHDR(m, M_DONTWAIT, MT_DATA);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1206 if (!m)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1207 return 0;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1209 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1210 if ((inp->inp_vflag & INP_IPV6) != 0) {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1211 ip6 = mtod(m, struct ip6_hdr *);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1212 th = (struct tcphdr *)(ip6 + 1);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1213 m->m_pkthdr.len = m->m_len =
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1214 sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1215 tcp_fillheaders(tp, ip6, th);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1216 hdrsiz = ipsec6_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1217 } else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1218 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1219 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1220 ip = mtod(m, struct ip *);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1221 th = (struct tcphdr *)(ip + 1);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1222 m->m_pkthdr.len = m->m_len = sizeof(struct tcpiphdr);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1223 tcp_fillheaders(tp, ip, th);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1224 hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1225 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1226
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1227 m_free(m);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1228 return hdrsiz;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1229 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1230 #endif /*IPSEC*/
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1231
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1232 /*
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1233 * Return a pointer to the cached information about the remote host.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1234 * The cached information is stored in the protocol specific part of
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1235 * the route metrics.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1236 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1237 struct rmxp_tao *
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1238 tcp_gettaocache(inp)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1239 struct inpcb *inp;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1240 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1241 struct rtentry *rt;
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1242
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1243 #ifdef INET6
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1244 if ((inp->inp_vflag & INP_IPV6) != 0)
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1245 rt = tcp_rtlookup6(inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1246 else
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1247 #endif /* INET6 */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1248 rt = tcp_rtlookup(inp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1249
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1250 /* Make sure this is a host route and is up. */
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1251 if (rt == NULL ||
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1252 (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST))
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1253 return NULL;
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jlarmour
parents:
diff changeset
1254
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1255 return rmx_taop(rt->rt_rmx);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1256 }
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jlarmour
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diff changeset
1257
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jlarmour
parents:
diff changeset
1258 /*
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jlarmour
parents:
diff changeset
1259 * Clear all the TAO cache entries, called from tcp_init.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1260 *
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jlarmour
parents:
diff changeset
1261 * XXX
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1262 * This routine is just an empty one, because we assume that the routing
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1263 * routing tables are initialized at the same time when TCP, so there is
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1264 * nothing in the cache left over.
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jlarmour
parents:
diff changeset
1265 */
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jlarmour
parents:
diff changeset
1266 static void
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1267 tcp_cleartaocache()
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1268 {
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1269 }