| 1 | /*␊ |
| 2 | * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * This file contains Original Code and/or Modifications of Original Code␊ |
| 7 | * as defined in and that are subject to the Apple Public Source License␊ |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
| 9 | * compliance with the License. The rights granted to you under the License␊ |
| 10 | * may not be used to create, or enable the creation or redistribution of,␊ |
| 11 | * unlawful or unlicensed copies of an Apple operating system, or to␊ |
| 12 | * circumvent, violate, or enable the circumvention or violation of, any␊ |
| 13 | * terms of an Apple operating system software license agreement.␊ |
| 14 | * ␊ |
| 15 | * Please obtain a copy of the License at␊ |
| 16 | * http://www.opensource.apple.com/apsl/ and read it before using this file.␊ |
| 17 | * ␊ |
| 18 | * The Original Code and all software distributed under the License are␊ |
| 19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
| 23 | * Please see the License for the specific language governing rights and␊ |
| 24 | * limitations under the License.␊ |
| 25 | * ␊ |
| 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@␊ |
| 27 | */␊ |
| 28 | /*␊ |
| 29 | * Copyright (c) 1982, 1986, 1993␊ |
| 30 | *␉The Regents of the University of California. All rights reserved.␊ |
| 31 | *␊ |
| 32 | * Redistribution and use in source and binary forms, with or without␊ |
| 33 | * modification, are permitted provided that the following conditions␊ |
| 34 | * are met:␊ |
| 35 | * 1. Redistributions of source code must retain the above copyright␊ |
| 36 | * notice, this list of conditions and the following disclaimer.␊ |
| 37 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 38 | * notice, this list of conditions and the following disclaimer in the␊ |
| 39 | * documentation and/or other materials provided with the distribution.␊ |
| 40 | * 3. All advertising materials mentioning features or use of this software␊ |
| 41 | * must display the following acknowledgement:␊ |
| 42 | *␉This product includes software developed by the University of␊ |
| 43 | *␉California, Berkeley and its contributors.␊ |
| 44 | * 4. Neither the name of the University nor the names of its contributors␊ |
| 45 | * may be used to endorse or promote products derived from this software␊ |
| 46 | * without specific prior written permission.␊ |
| 47 | *␊ |
| 48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
| 49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
| 50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
| 51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
| 52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
| 53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
| 54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
| 55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
| 56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
| 57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
| 58 | * SUCH DAMAGE.␊ |
| 59 | *␊ |
| 60 | *␉@(#)tcp.h␉8.1 (Berkeley) 6/10/93␊ |
| 61 | * $FreeBSD: src/sys/netinet/tcp.h,v 1.13.2.3 2001/03/01 22:08:42 jlemon Exp $␊ |
| 62 | */␊ |
| 63 | ␊ |
| 64 | #ifndef _NETINET_TCP_H_␊ |
| 65 | #define _NETINET_TCP_H_␊ |
| 66 | #include <sys/appleapiopts.h>␊ |
| 67 | #include <sys/_types.h>␊ |
| 68 | #include <machine/endian.h>␊ |
| 69 | ␊ |
| 70 | #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)␊ |
| 71 | typedef␉__uint32_t tcp_seq;␊ |
| 72 | typedef __uint32_t tcp_cc;␉␉/* connection count per rfc1644 */␊ |
| 73 | ␊ |
| 74 | #define tcp6_seq␉tcp_seq␉/* for KAME src sync over BSD*'s */␊ |
| 75 | #define tcp6hdr␉␉tcphdr␉/* for KAME src sync over BSD*'s */␊ |
| 76 | ␊ |
| 77 | /*␊ |
| 78 | * TCP header.␊ |
| 79 | * Per RFC 793, September, 1981.␊ |
| 80 | */␊ |
| 81 | struct tcphdr {␊ |
| 82 | ␉unsigned short␉th_sport;␉/* source port */␊ |
| 83 | ␉unsigned short␉th_dport;␉/* destination port */␊ |
| 84 | ␉tcp_seq␉th_seq;␉␉␉/* sequence number */␊ |
| 85 | ␉tcp_seq␉th_ack;␉␉␉/* acknowledgement number */␊ |
| 86 | #if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN␊ |
| 87 | ␉unsigned int␉th_x2:4,␉/* (unused) */␊ |
| 88 | ␉␉␉th_off:4;␉/* data offset */␊ |
| 89 | #endif␊ |
| 90 | #if __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN␊ |
| 91 | ␉unsigned int␉th_off:4,␉/* data offset */␊ |
| 92 | ␉␉␉th_x2:4;␉/* (unused) */␊ |
| 93 | #endif␊ |
| 94 | ␉unsigned char␉th_flags;␊ |
| 95 | #define␉TH_FIN␉0x01␊ |
| 96 | #define␉TH_SYN␉0x02␊ |
| 97 | #define␉TH_RST␉0x04␊ |
| 98 | #define␉TH_PUSH␉0x08␊ |
| 99 | #define␉TH_ACK␉0x10␊ |
| 100 | #define␉TH_URG␉0x20␊ |
| 101 | #define␉TH_ECE␉0x40␊ |
| 102 | #define␉TH_CWR␉0x80␊ |
| 103 | #define␉TH_FLAGS␉(TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)␊ |
| 104 | ␊ |
| 105 | ␉unsigned short␉th_win;␉␉/* window */␊ |
| 106 | ␉unsigned short␉th_sum;␉␉/* checksum */␊ |
| 107 | ␉unsigned short␉th_urp;␉␉/* urgent pointer */␊ |
| 108 | };␊ |
| 109 | ␊ |
| 110 | #define␉TCPOPT_EOL␉␉0␊ |
| 111 | #define␉TCPOPT_NOP␉␉1␊ |
| 112 | #define␉TCPOPT_MAXSEG␉␉2␊ |
| 113 | #define TCPOLEN_MAXSEG␉␉4␊ |
| 114 | #define TCPOPT_WINDOW␉␉3␊ |
| 115 | #define TCPOLEN_WINDOW␉␉3␊ |
| 116 | #define TCPOPT_SACK_PERMITTED␉4␉␉/* Experimental */␊ |
| 117 | #define TCPOLEN_SACK_PERMITTED␉2␊ |
| 118 | #define TCPOPT_SACK␉␉5␉␉/* Experimental */␊ |
| 119 | #define TCPOLEN_SACK␉␉8␉␉/* len of sack block */␊ |
| 120 | #define TCPOPT_TIMESTAMP␉8␊ |
| 121 | #define TCPOLEN_TIMESTAMP␉10␊ |
| 122 | #define TCPOLEN_TSTAMP_APPA␉␉(TCPOLEN_TIMESTAMP+2) /* appendix A */␊ |
| 123 | #define TCPOPT_TSTAMP_HDR␉␉\␊ |
| 124 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)␊ |
| 125 | ␊ |
| 126 | #define␉MAX_TCPOPTLEN␉␉40␉/* Absolute maximum TCP options len */␊ |
| 127 | ␊ |
| 128 | #define␉TCPOPT_CC␉␉11␉␉/* CC options: RFC-1644 */␊ |
| 129 | #define TCPOPT_CCNEW␉␉12␊ |
| 130 | #define TCPOPT_CCECHO␉␉13␊ |
| 131 | #define␉ TCPOLEN_CC␉␉␉6␊ |
| 132 | #define␉ TCPOLEN_CC_APPA␉␉(TCPOLEN_CC+2)␊ |
| 133 | #define␉ TCPOPT_CC_HDR(ccopt)␉␉\␊ |
| 134 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)␊ |
| 135 | #define␉TCPOPT_SIGNATURE␉␉19␉/* Keyed MD5: RFC 2385 */␊ |
| 136 | #define␉ TCPOLEN_SIGNATURE␉␉18␊ |
| 137 | ␊ |
| 138 | /* Option definitions */␊ |
| 139 | #define TCPOPT_SACK_PERMIT_HDR␉\␊ |
| 140 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)␊ |
| 141 | #define␉TCPOPT_SACK_HDR␉␉(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8)␊ |
| 142 | /* Miscellaneous constants */␊ |
| 143 | #define␉MAX_SACK_BLKS␉6␉/* Max # SACK blocks stored at sender side */␊ |
| 144 | #define␉TCP_MAX_SACK␉3␉/* MAX # SACKs sent in any segment */␊ |
| 145 | ␊ |
| 146 | ␊ |
| 147 | /*␊ |
| 148 | * Default maximum segment size for TCP.␊ |
| 149 | * With an IP MTU of 576, this is 536,␊ |
| 150 | * but 512 is probably more convenient.␊ |
| 151 | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).␊ |
| 152 | */␊ |
| 153 | #define␉TCP_MSS␉512␊ |
| 154 | ␊ |
| 155 | /*␊ |
| 156 | * TCP_MINMSS is defined to be 216 which is fine for the smallest␊ |
| 157 | * link MTU (256 bytes, SLIP interface) in the Internet.␊ |
| 158 | * However it is very unlikely to come across such low MTU interfaces␊ |
| 159 | * these days (anno dato 2004).␊ |
| 160 | * Probably it can be set to 512 without ill effects. But we play safe.␊ |
| 161 | * See tcp_subr.c tcp_minmss SYSCTL declaration for more comments.␊ |
| 162 | * Setting this to "0" disables the minmss check.␊ |
| 163 | */␊ |
| 164 | #define␉TCP_MINMSS 216␊ |
| 165 | ␊ |
| 166 | /*␊ |
| 167 | * TCP_MINMSSOVERLOAD is defined to be 1000 which should cover any type␊ |
| 168 | * of interactive TCP session.␊ |
| 169 | * See tcp_subr.c tcp_minmssoverload SYSCTL declaration and tcp_input.c␊ |
| 170 | * for more comments.␊ |
| 171 | * Setting this to "0" disables the minmssoverload check.␊ |
| 172 | */␊ |
| 173 | #define␉TCP_MINMSSOVERLOAD 1000␊ |
| 174 | ␊ |
| 175 | /*␊ |
| 176 | * Default maximum segment size for TCP6.␊ |
| 177 | * With an IP6 MSS of 1280, this is 1220,␊ |
| 178 | * but 1024 is probably more convenient. (xxx kazu in doubt)␊ |
| 179 | * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr))␊ |
| 180 | */␊ |
| 181 | #define␉TCP6_MSS␉1024␊ |
| 182 | ␊ |
| 183 | #define␉TCP_MAXWIN␉65535␉/* largest value for (unscaled) window */␊ |
| 184 | #define␉TTCP_CLIENT_SND_WND␉4096␉/* dflt send window for T/TCP client */␊ |
| 185 | ␊ |
| 186 | #define TCP_MAX_WINSHIFT␉14␉/* maximum window shift */␊ |
| 187 | ␊ |
| 188 | #define TCP_MAXBURST␉␉4 ␉/* maximum segments in a burst */␊ |
| 189 | ␊ |
| 190 | #define TCP_MAXHLEN␉(0xf<<2)␉/* max length of header in bytes */␊ |
| 191 | #define TCP_MAXOLEN␉(TCP_MAXHLEN - sizeof(struct tcphdr))␊ |
| 192 | ␉␉␉␉␉/* max space left for options */␊ |
| 193 | #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */␊ |
| 194 | ␊ |
| 195 | /*␊ |
| 196 | * User-settable options (used with setsockopt).␊ |
| 197 | */␊ |
| 198 | #define␉TCP_NODELAY 0x01 /* don't delay send to coalesce packets */␊ |
| 199 | #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)␊ |
| 200 | #define␉TCP_MAXSEG 0x02 /* set maximum segment size */␊ |
| 201 | #define TCP_NOPUSH 0x04 /* don't push last block of write */␊ |
| 202 | #define TCP_NOOPT 0x08 /* don't use TCP options */␊ |
| 203 | #define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */␊ |
| 204 | #define TCP_CONNECTIONTIMEOUT 0x20 /* connection timeout */␊ |
| 205 | #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */␊ |
| 206 | ␊ |
| 207 | #endif␊ |
| 208 | |
