Move tcpdump-3.9/ to tcpdump/. No need for a versioned dir.
[dragonfly.git] / contrib / tcpdump / tcp.h
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1/* @(#) $Header: /tcpdump/master/tcpdump/tcp.h,v 1.11.2.1 2005/11/29 09:09:26 hannes Exp $ (LBL) */
2/*
3 * Copyright (c) 1982, 1986, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
35 */
36
37typedef u_int32_t tcp_seq;
38/*
39 * TCP header.
40 * Per RFC 793, September, 1981.
41 */
42struct tcphdr {
43 u_int16_t th_sport; /* source port */
44 u_int16_t th_dport; /* destination port */
45 tcp_seq th_seq; /* sequence number */
46 tcp_seq th_ack; /* acknowledgement number */
47 u_int8_t th_offx2; /* data offset, rsvd */
48#define TH_OFF(th) (((th)->th_offx2 & 0xf0) >> 4)
49 u_int8_t th_flags;
50#define TH_FIN 0x01
51#define TH_SYN 0x02
52#define TH_RST 0x04
53#define TH_PUSH 0x08
54#define TH_ACK 0x10
55#define TH_URG 0x20
56#define TH_ECNECHO 0x40 /* ECN Echo */
57#define TH_CWR 0x80 /* ECN Cwnd Reduced */
58 u_int16_t th_win; /* window */
59 u_int16_t th_sum; /* checksum */
60 u_int16_t th_urp; /* urgent pointer */
61};
62
63#define TCPOPT_EOL 0
64#define TCPOPT_NOP 1
65#define TCPOPT_MAXSEG 2
66#define TCPOLEN_MAXSEG 4
67#define TCPOPT_WSCALE 3 /* window scale factor (rfc1323) */
68#define TCPOPT_SACKOK 4 /* selective ack ok (rfc2018) */
69#define TCPOPT_SACK 5 /* selective ack (rfc2018) */
70#define TCPOPT_ECHO 6 /* echo (rfc1072) */
71#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */
72#define TCPOPT_TIMESTAMP 8 /* timestamp (rfc1323) */
73#define TCPOLEN_TIMESTAMP 10
74#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
75#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */
76#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */
77#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */
78#define TCPOPT_SIGNATURE 19 /* Keyed MD5 (rfc2385) */
79#define TCPOLEN_SIGNATURE 18
80#define TCP_SIGLEN 16 /* length of an option 19 digest */
81#define TCPOPT_AUTH 20 /* Enhanced AUTH option */
82
83#define TCPOPT_TSTAMP_HDR \
84 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)