workbench/network/common/include/netinet/tcp.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
  34  * $Id$
  35  */
  36
  37 #ifndef _NETINET_TCP_H_
  38 #define _NETINET_TCP_H_
  39
  40 typedef u_int32_t       tcp_seq;
  41 typedef u_int32_t       tcp_cc;                 /* connection count per rfc1644 */
  42
  43 /*
  44  * TCP header.
  45  * Per RFC 793, September, 1981.
  46  */
  47 struct tcphdr {
  48         u_short th_sport;               /* source port */
  49         u_short th_dport;               /* destination port */
  50         tcp_seq th_seq;                 /* sequence number */
  51         tcp_seq th_ack;                 /* acknowledgement number */
  52 #if BYTE_ORDER == LITTLE_ENDIAN
  53         u_char  th_x2:4,                /* (unused) */
  54                 th_off:4;               /* data offset */
  55 #endif
  56 #if BYTE_ORDER == BIG_ENDIAN
  57         u_char  th_off:4,               /* data offset */
  58                 th_x2:4;                /* (unused) */
  59 #endif
  60         u_char  th_flags;
  61 #define TH_FIN  0x01
  62 #define TH_SYN  0x02
  63 #define TH_RST  0x04
  64 #define TH_PUSH 0x08
  65 #define TH_ACK  0x10
  66 #define TH_URG  0x20
  67 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG)
  68
  69         u_short th_win;                 /* window */
  70         u_short th_sum;                 /* checksum */
  71         u_short th_urp;                 /* urgent pointer */
  72 };
  73
  74 #define TCPOPT_EOL              0
  75 #define TCPOPT_NOP              1
  76 #define TCPOPT_MAXSEG           2
  77 #define    TCPOLEN_MAXSEG               4
  78 #define TCPOPT_WINDOW           3
  79 #define    TCPOLEN_WINDOW               3
  80 #define TCPOPT_SACK_PERMITTED   4               /* Experimental */
  81 #define    TCPOLEN_SACK_PERMITTED       2
  82 #define TCPOPT_SACK             5               /* Experimental */
  83 #define TCPOPT_TIMESTAMP        8
  84 #define    TCPOLEN_TIMESTAMP            10
  85 #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
  86 #define    TCPOPT_TSTAMP_HDR            \
  87     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
  88
  89 #define TCPOPT_CC               11              /* CC options: RFC-1644 */
  90 #define TCPOPT_CCNEW            12
  91 #define TCPOPT_CCECHO           13
  92 #define    TCPOLEN_CC                   6
  93 #define    TCPOLEN_CC_APPA              (TCPOLEN_CC+2)
  94 #define    TCPOPT_CC_HDR(ccopt)         \
  95     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
  96
  97 /*
  98  * Default maximum segment size for TCP.
  99  * With an IP MSS of 576, this is 536,
 100  * but 512 is probably more convenient.
 101  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 102  */
 103 #define TCP_MSS 512
 104
 105 #define TCP_MAXWIN      65535   /* largest value for (unscaled) window */
 106 #define TTCP_CLIENT_SND_WND     4096    /* dflt send window for T/TCP client */
 107
 108 #define TCP_MAX_WINSHIFT        14      /* maximum window shift */
 109
 110 #define TCP_MAXHLEN     (0xf<<2)        /* max length of header in bytes */
 111 #define TCP_MAXOLEN     (TCP_MAXHLEN - sizeof(struct tcphdr))
 112                                         /* max space left for options */
 113
 114 /*
 115  * User-settable options (used with setsockopt).
 116  */
 117 #define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
 118 #define TCP_MAXSEG      0x02    /* set maximum segment size */
 119 #define TCP_KEEPALIVE   0x03    /* Send KEEPALIVE probe when idle (in ms) */
 120 #define TCP_NOPUSH      0x04    /* don't push last block of write */
 121 #define TCP_KEEPIDLE    0x05    /* Send KEEPALIVE probe when idle (in sec) */
 122 #define TCP_KEEPINTVL   0x06    /* Interval between keepalives */
 123 #define TCP_KEEPCNT     0x07    /* Number of keepalives before death */
 124 #define TCP_NOOPT       0x08    /* don't use TCP options */
 125
 126 #endif