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  * $FreeBSD$
   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 #define tcp6_seq        tcp_seq /* for KAME src sync over BSD*'s */
   44 #define tcp6hdr         tcphdr  /* for KAME src sync over BSD*'s */
   45 
   46 /*
   47  * TCP header.
   48  * Per RFC 793, September, 1981.
   49  */
   50 struct tcphdr {
   51         u_short th_sport;               /* source port */
   52         u_short th_dport;               /* destination port */
   53         tcp_seq th_seq;                 /* sequence number */
   54         tcp_seq th_ack;                 /* acknowledgement number */
   55 #if BYTE_ORDER == LITTLE_ENDIAN
   56         u_int   th_x2:4,                /* (unused) */
   57                 th_off:4;               /* data offset */
   58 #endif
   59 #if BYTE_ORDER == BIG_ENDIAN
   60         u_int   th_off:4,               /* data offset */
   61                 th_x2:4;                /* (unused) */
   62 #endif
   63         u_char  th_flags;
   64 #define TH_FIN  0x01
   65 #define TH_SYN  0x02
   66 #define TH_RST  0x04
   67 #define TH_PUSH 0x08
   68 #define TH_ACK  0x10
   69 #define TH_URG  0x20
   70 #define TH_ECE  0x40
   71 #define TH_CWR  0x80
   72 #define TH_FLAGS        (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)
   73 
   74         u_short th_win;                 /* window */
   75         u_short th_sum;                 /* checksum */
   76         u_short th_urp;                 /* urgent pointer */
   77 };
   78 
   79 #define TCPOPT_EOL              0
   80 #define TCPOPT_NOP              1
   81 #define TCPOPT_MAXSEG           2
   82 #define    TCPOLEN_MAXSEG               4
   83 #define TCPOPT_WINDOW           3
   84 #define    TCPOLEN_WINDOW               3
   85 #define TCPOPT_SACK_PERMITTED   4               /* Experimental */
   86 #define    TCPOLEN_SACK_PERMITTED       2
   87 #define TCPOPT_SACK             5               /* Experimental */
   88 #define TCPOPT_TIMESTAMP        8
   89 #define    TCPOLEN_TIMESTAMP            10
   90 #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
   91 #define    TCPOPT_TSTAMP_HDR            \
   92     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
   93 
   94 #define TCPOPT_CC               11              /* CC options: RFC-1644 */
   95 #define TCPOPT_CCNEW            12
   96 #define TCPOPT_CCECHO           13
   97 #define    TCPOLEN_CC                   6
   98 #define    TCPOLEN_CC_APPA              (TCPOLEN_CC+2)
   99 #define    TCPOPT_CC_HDR(ccopt)         \
  100     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
  101 #define TCPOPT_SIGNATURE                19      /* Keyed MD5: RFC 2385 */
  102 #define    TCPOLEN_SIGNATURE            18
  103 
  104 /*
  105  * Default maximum segment size for TCP.
  106  * With an IP MSS of 576, this is 536,
  107  * but 512 is probably more convenient.
  108  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
  109  */
  110 #define TCP_MSS 512
  111 
  112 /*
  113  * Default maximum segment size for TCP6.
  114  * With an IP6 MSS of 1280, this is 1220,
  115  * but 1024 is probably more convenient. (xxx kazu in doubt)
  116  * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr))
  117  */
  118 #define TCP6_MSS        1024
  119 
  120 #define TCP_MAXWIN      65535   /* largest value for (unscaled) window */
  121 #define TTCP_CLIENT_SND_WND     4096    /* dflt send window for T/TCP client */
  122 
  123 #define TCP_MAX_WINSHIFT        14      /* maximum window shift */
  124 
  125 #define TCP_MAXBURST            4       /* maximum segments in a burst */
  126 
  127 #define TCP_MAXHLEN     (0xf<<2)        /* max length of header in bytes */
  128 #define TCP_MAXOLEN     (TCP_MAXHLEN - sizeof(struct tcphdr))
  129                                         /* max space left for options */
  130 
  131 /*
  132  * User-settable options (used with setsockopt).
  133  */
  134 #define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
  135 #define TCP_MAXSEG      0x02    /* set maximum segment size */
  136 #define TCP_NOPUSH      0x04    /* don't push last block of write */
  137 #define TCP_NOOPT       0x08    /* don't use TCP options */
  138 #define TCP_MD5SIG      0x10    /* use MD5 digests (RFC2385) */
  139 
  140 #endif

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