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annotate packages/net/tcpip/current/include/netinet/tcp_timer.h @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents e0c0827131d1
children
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1 //==========================================================================
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2 //
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3 // include/netinet_tcp_timer.h
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4 //
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5 //
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6 //
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7 //==========================================================================
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8 // ####BSDALTCOPYRIGHTBEGIN####
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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 // or other sources, and if so are covered by the appropriate copyright
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12 // and license included herein.
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13 // -------------------------------------------
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14 // ####BSDALTCOPYRIGHTEND####
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15 //==========================================================================
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16 //#####DESCRIPTIONBEGIN####
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17 //
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18 // Author(s): gthomas
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19 // Contributors: gthomas
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20 // Date: 2000-01-10
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21 // Purpose:
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22 // Description:
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23 //
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24 //
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25 //####DESCRIPTIONEND####
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26 //
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27 //==========================================================================
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28
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30 /* $OpenBSD: tcp_timer.h,v 1.3 1997/02/24 14:06:46 niklas Exp $ */
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31 /* $NetBSD: tcp_timer.h,v 1.6 1995/03/26 20:32:37 jtc Exp $ */
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32
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33 /*
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34 * Copyright (c) 1982, 1986, 1993
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35 * The Regents of the University of California. All rights reserved.
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36 *
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37 * Redistribution and use in source and binary forms, with or without
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38 * modification, are permitted provided that the following conditions
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39 * are met:
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40 * 1. Redistributions of source code must retain the above copyright
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41 * notice, this list of conditions and the following disclaimer.
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42 * 2. Redistributions in binary form must reproduce the above copyright
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43 * notice, this list of conditions and the following disclaimer in the
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44 * documentation and/or other materials provided with the distribution.
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45 * 3. All advertising materials mentioning features or use of this software
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46 * must display the following acknowledgement:
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47 * This product includes software developed by the University of
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48 * California, Berkeley and its contributors.
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49 * 4. Neither the name of the University nor the names of its contributors
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50 * may be used to endorse or promote products derived from this software
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51 * without specific prior written permission.
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52 *
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53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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63 * SUCH DAMAGE.
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64 *
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65 * @(#)tcp_timer.h 8.1 (Berkeley) 6/10/93
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66 */
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67
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68 #ifndef _NETINET_TCP_TIMER_H_
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69 #define _NETINET_TCP_TIMER_H_
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70
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71 /*
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72 * Definitions of the TCP timers. These timers are counted
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73 * down PR_SLOWHZ times a second.
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74 */
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75 #define TCPT_NTIMERS 4
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76
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77 #define TCPT_REXMT 0 /* retransmit */
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78 #define TCPT_PERSIST 1 /* retransmit persistance */
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79 #define TCPT_KEEP 2 /* keep alive */
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80 #define TCPT_2MSL 3 /* 2*msl quiet time timer */
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81
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82 /*
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83 * The TCPT_REXMT timer is used to force retransmissions.
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84 * The TCP has the TCPT_REXMT timer set whenever segments
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85 * have been sent for which ACKs are expected but not yet
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86 * received. If an ACK is received which advances tp->snd_una,
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87 * then the retransmit timer is cleared (if there are no more
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88 * outstanding segments) or reset to the base value (if there
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89 * are more ACKs expected). Whenever the retransmit timer goes off,
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90 * we retransmit one unacknowledged segment, and do a backoff
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91 * on the retransmit timer.
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92 *
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93 * The TCPT_PERSIST timer is used to keep window size information
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94 * flowing even if the window goes shut. If all previous transmissions
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95 * have been acknowledged (so that there are no retransmissions in progress),
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96 * and the window is too small to bother sending anything, then we start
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97 * the TCPT_PERSIST timer. When it expires, if the window is nonzero,
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98 * we go to transmit state. Otherwise, at intervals send a single byte
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99 * into the peer's window to force him to update our window information.
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100 * We do this at most as often as TCPT_PERSMIN time intervals,
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101 * but no more frequently than the current estimate of round-trip
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102 * packet time. The TCPT_PERSIST timer is cleared whenever we receive
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103 * a window update from the peer.
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104 *
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105 * The TCPT_KEEP timer is used to keep connections alive. If an
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106 * connection is idle (no segments received) for TCPTV_KEEP_INIT amount of time,
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107 * but not yet established, then we drop the connection. Once the connection
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108 * is established, if the connection is idle for TCPTV_KEEP_IDLE time
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109 * (and keepalives have been enabled on the socket), we begin to probe
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110 * the connection. We force the peer to send us a segment by sending:
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111 * <SEQ=SND.UNA-1><ACK=RCV.NXT><CTL=ACK>
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112 * This segment is (deliberately) outside the window, and should elicit
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113 * an ack segment in response from the peer. If, despite the TCPT_KEEP
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114 * initiated segments we cannot elicit a response from a peer in TCPT_MAXIDLE
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115 * amount of time probing, then we drop the connection.
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116 */
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117
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118 /*
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119 * Time constants.
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120 */
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121 #define TCPTV_MSL ( 30*PR_SLOWHZ) /* max seg lifetime (hah!) */
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122 #define TCPTV_SRTTBASE 0 /* base roundtrip time;
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123 if 0, no idea yet */
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124 #define TCPTV_SRTTDFLT ( 3*PR_SLOWHZ) /* assumed RTT if no info */
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125
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126 #define TCPTV_PERSMIN ( 5*PR_SLOWHZ) /* retransmit persistance */
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127 #define TCPTV_PERSMAX ( 60*PR_SLOWHZ) /* maximum persist interval */
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128
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129 #define TCPTV_KEEP_INIT ( 75*PR_SLOWHZ) /* initial connect keep alive */
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130 #define TCPTV_KEEP_IDLE (120*60*PR_SLOWHZ) /* dflt time before probing */
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131 #define TCPTV_KEEPINTVL ( 75*PR_SLOWHZ) /* default probe interval */
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132 #define TCPTV_KEEPCNT 8 /* max probes before drop */
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133
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134 #define TCPTV_MIN ( 1*PR_SLOWHZ) /* minimum allowable value */
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135 #define TCPTV_REXMTMAX ( 64*PR_SLOWHZ) /* max allowable REXMT value */
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136
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137 #define TCP_LINGERTIME 120 /* linger at most 2 minutes */
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138
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139 #define TCP_MAXRXTSHIFT 12 /* maximum retransmits */
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140
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141 #ifdef TCPTIMERS
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142 char *tcptimers[] =
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143 { "REXMT", "PERSIST", "KEEP", "2MSL" };
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144 #endif
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145
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146 /*
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147 * Force a time value to be in a certain range.
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148 */
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149 #define TCPT_RANGESET(tv, value, tvmin, tvmax) { \
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150 (tv) = (value); \
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151 if ((tv) < (tvmin)) \
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152 (tv) = (tvmin); \
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153 else if ((tv) > (tvmax)) \
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154 (tv) = (tvmax); \
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155 }
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156
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157 #ifdef _KERNEL
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158 extern int tcptv_keep_init;
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159 extern int tcp_keepidle; /* time before keepalive probes begin */
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160 extern int tcp_keepintvl; /* time between keepalive probes */
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161 extern int tcp_maxidle; /* time to drop after starting probes */
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162 extern int tcp_ttl; /* time to live for TCP segs */
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163 extern int tcp_backoff[];
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164 #endif
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165
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166 #endif // _NETINET_TCP_TIMER_H_