The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp.h

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    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  * $FreeBSD: src/sys/netinet/tcp.h,v 1.6.8.1 1999/09/05 08:18:38 peter Exp $
   35  */
   36 
   37 #ifndef _NETINET_TCP_H_
   38 #define _NETINET_TCP_H_
   39 
   40 typedef u_long  tcp_seq;
   41 typedef u_long  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_NOPUSH      0x04    /* don't push last block of write */
  120 #define TCP_NOOPT       0x08    /* don't use TCP options */
  121 
  122 #endif

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