bsd/netinet/tcp.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1982, 1986, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
  58  * $FreeBSD: src/sys/netinet/tcp.h,v 1.13.2.3 2001/03/01 22:08:42 jlemon Exp $
  59  */
  60
  61 #ifndef _NETINET_TCP_H_
  62 #define _NETINET_TCP_H_
  63 #include <sys/appleapiopts.h>
  64
  65 typedef u_int32_t tcp_seq;
  66 typedef u_int32_t tcp_cc;               /* connection count per rfc1644 */
  67
  68 #define tcp6_seq        tcp_seq /* for KAME src sync over BSD*'s */
  69 #define tcp6hdr         tcphdr  /* for KAME src sync over BSD*'s */
  70
  71 /*
  72  * TCP header.
  73  * Per RFC 793, September, 1981.
  74  */
  75 struct tcphdr {
  76         u_short th_sport;               /* source port */
  77         u_short th_dport;               /* destination port */
  78         tcp_seq th_seq;                 /* sequence number */
  79         tcp_seq th_ack;                 /* acknowledgement number */
  80 #if BYTE_ORDER == LITTLE_ENDIAN
  81         u_int   th_x2:4,                /* (unused) */
  82                 th_off:4;               /* data offset */
  83 #endif
  84 #if BYTE_ORDER == BIG_ENDIAN
  85         u_int   th_off:4,               /* data offset */
  86                 th_x2:4;                /* (unused) */
  87 #endif
  88         u_char  th_flags;
  89 #define TH_FIN  0x01
  90 #define TH_SYN  0x02
  91 #define TH_RST  0x04
  92 #define TH_PUSH 0x08
  93 #define TH_ACK  0x10
  94 #define TH_URG  0x20
  95 #define TH_ECE  0x40
  96 #define TH_CWR  0x80
  97 #define TH_FLAGS        (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)
  98
  99         u_short th_win;                 /* window */
 100         u_short th_sum;                 /* checksum */
 101         u_short th_urp;                 /* urgent pointer */
 102 };
 103
 104 #define TCPOPT_EOL              0
 105 #define TCPOPT_NOP              1
 106 #define TCPOPT_MAXSEG           2
 107 #define    TCPOLEN_MAXSEG               4
 108 #define TCPOPT_WINDOW           3
 109 #define    TCPOLEN_WINDOW               3
 110 #define TCPOPT_SACK_PERMITTED   4               /* Experimental */
 111 #define    TCPOLEN_SACK_PERMITTED       2
 112 #define TCPOPT_SACK             5               /* Experimental */
 113 #define TCPOPT_TIMESTAMP        8
 114 #define    TCPOLEN_TIMESTAMP            10
 115 #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
 116 #define    TCPOPT_TSTAMP_HDR            \
 117     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
 118
 119 #define TCPOPT_CC               11              /* CC options: RFC-1644 */
 120 #define TCPOPT_CCNEW            12
 121 #define TCPOPT_CCECHO           13
 122 #define    TCPOLEN_CC                   6
 123 #define    TCPOLEN_CC_APPA              (TCPOLEN_CC+2)
 124 #define    TCPOPT_CC_HDR(ccopt)         \
 125     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
 126
 127 /*
 128  * Default maximum segment size for TCP.
 129  * With an IP MSS of 576, this is 536,
 130  * but 512 is probably more convenient.
 131  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 132  */
 133 #define TCP_MSS 512
 134
 135 /*
 136  * Default maximum segment size for TCP6.
 137  * With an IP6 MSS of 1280, this is 1220,
 138  * but 1024 is probably more convenient. (xxx kazu in doubt)
 139  * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr))
 140  */
 141 #define TCP6_MSS        1024
 142
 143 #define TCP_MAXWIN      65535   /* largest value for (unscaled) window */
 144 #define TTCP_CLIENT_SND_WND     4096    /* dflt send window for T/TCP client */
 145
 146 #define TCP_MAX_WINSHIFT        14      /* maximum window shift */
 147
 148 #define TCP_MAXBURST            4       /* maximum segments in a burst */
 149
 150 #define TCP_MAXHLEN     (0xf<<2)        /* max length of header in bytes */
 151 #define TCP_MAXOLEN     (TCP_MAXHLEN - sizeof(struct tcphdr))
 152                                         /* max space left for options */
 153
 154 /*
 155  * User-settable options (used with setsockopt).
 156  */
 157 #define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
 158 #define TCP_MAXSEG      0x02    /* set maximum segment size */
 159 #define TCP_NOPUSH      0x04    /* don't push last block of write */
 160 #define TCP_NOOPT       0x08    /* don't use TCP options */
 161
 162 #endif