dist/tcpdump/tcp.h

   1 /*      $NetBSD$        */
   2
   3 /* @(#) Header: /tcpdump/master/tcpdump/tcp.h,v 1.11.2.1 2005/11/29 09:09:26 hannes Exp (LBL) */
   4 /*
   5  * Copyright (c) 1982, 1986, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
  33  */
  34
  35 typedef u_int32_t       tcp_seq;
  36 /*
  37  * TCP header.
  38  * Per RFC 793, September, 1981.
  39  */
  40 struct tcphdr {
  41         u_int16_t       th_sport;               /* source port */
  42         u_int16_t       th_dport;               /* destination port */
  43         tcp_seq         th_seq;                 /* sequence number */
  44         tcp_seq         th_ack;                 /* acknowledgement number */
  45         u_int8_t        th_offx2;               /* data offset, rsvd */
  46 #define TH_OFF(th)      (((th)->th_offx2 & 0xf0) >> 4)
  47         u_int8_t        th_flags;
  48 #define TH_FIN  0x01
  49 #define TH_SYN  0x02
  50 #define TH_RST  0x04
  51 #define TH_PUSH 0x08
  52 #define TH_ACK  0x10
  53 #define TH_URG  0x20
  54 #define TH_ECNECHO      0x40    /* ECN Echo */
  55 #define TH_CWR          0x80    /* ECN Cwnd Reduced */
  56         u_int16_t       th_win;                 /* window */
  57         u_int16_t       th_sum;                 /* checksum */
  58         u_int16_t       th_urp;                 /* urgent pointer */
  59 };
  60
  61 #define TCPOPT_EOL              0
  62 #define TCPOPT_NOP              1
  63 #define TCPOPT_MAXSEG           2
  64 #define    TCPOLEN_MAXSEG               4
  65 #define TCPOPT_WSCALE           3       /* window scale factor (rfc1323) */
  66 #define TCPOPT_SACKOK           4       /* selective ack ok (rfc2018) */
  67 #define TCPOPT_SACK             5       /* selective ack (rfc2018) */
  68 #define TCPOPT_ECHO             6       /* echo (rfc1072) */
  69 #define TCPOPT_ECHOREPLY        7       /* echo (rfc1072) */
  70 #define TCPOPT_TIMESTAMP        8       /* timestamp (rfc1323) */
  71 #define    TCPOLEN_TIMESTAMP            10
  72 #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
  73 #define TCPOPT_CC               11      /* T/TCP CC options (rfc1644) */
  74 #define TCPOPT_CCNEW            12      /* T/TCP CC options (rfc1644) */
  75 #define TCPOPT_CCECHO           13      /* T/TCP CC options (rfc1644) */
  76 #define TCPOPT_SIGNATURE        19      /* Keyed MD5 (rfc2385) */
  77 #define    TCPOLEN_SIGNATURE            18
  78 #define TCP_SIGLEN 16                   /* length of an option 19 digest */
  79 #define TCPOPT_AUTH             20      /* Enhanced AUTH option */
  80
  81 #define TCPOPT_TSTAMP_HDR       \
  82     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)