tcp.h revision 1.3 
1/* @(#) Header: /tcpdump/master/tcpdump/tcp.h,v 1.14 2007-12-09 00:30:47 guy 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. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 *	@(#)tcp.h	8.1 (Berkeley) 6/10/93
31 */
32
33typedef	u_int32_t	tcp_seq;
34/*
35 * TCP header.
36 * Per RFC 793, September, 1981.
37 */
38struct tcphdr {
39	u_int16_t	th_sport;		/* source port */
40	u_int16_t	th_dport;		/* destination port */
41	tcp_seq		th_seq;			/* sequence number */
42	tcp_seq		th_ack;			/* acknowledgement number */
43	u_int8_t	th_offx2;		/* data offset, rsvd */
44	u_int8_t	th_flags;
45	u_int16_t	th_win;			/* window */
46	u_int16_t	th_sum;			/* checksum */
47	u_int16_t	th_urp;			/* urgent pointer */
48};
49
50#define TH_OFF(th)	(((th)->th_offx2 & 0xf0) >> 4)
51
52/* TCP flags */
53#define	TH_FIN     0x01
54#define	TH_SYN	   0x02
55#define	TH_RST	   0x04
56#define	TH_PUSH	   0x08
57#define	TH_ACK	   0x10
58#define	TH_URG	   0x20
59#define TH_ECNECHO 0x40	/* ECN Echo */
60#define TH_CWR	   0x80	/* ECN Cwnd Reduced */
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#define	TCPOPT_UTO		28	/* tcp user timeout (rfc5482) */
83#define	   TCPOLEN_UTO			4
84
85
86#define TCPOPT_TSTAMP_HDR	\
87    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
88
89#ifndef TELNET_PORT
90#define TELNET_PORT             23
91#endif
92#ifndef BGP_PORT
93#define BGP_PORT                179
94#endif
95#define NETBIOS_SSN_PORT        139
96#ifndef PPTP_PORT
97#define PPTP_PORT	        1723
98#endif
99#define BEEP_PORT               10288
100#ifndef NFS_PORT
101#define NFS_PORT	        2049
102#endif
103#define MSDP_PORT	        639
104#define RPKI_RTR_PORT	        2222 /* experimental up until sidr-wg registers a well-known port */
105#define LDP_PORT                646
106#ifndef SMB_PORT
107#define SMB_PORT                445
108#endif
109