/* @(#) $Header: /tcpdump/master/tcpdump/tcp.h,v 1.13.2.1 2007-12-09 00:31:35 guy Exp $ (LBL) *//* * Copyright (c) 1982, 1986, 1993 *	The Regents of the University of California.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * *	@(#)tcp.h	8.1 (Berkeley) 6/10/93 */typedef	u_int32_t	tcp_seq;/* * TCP header. * Per RFC 793, September, 1981. */struct tcphdr {	u_int16_t	th_sport;		/* source port */	u_int16_t	th_dport;		/* destination port */	tcp_seq		th_seq;			/* sequence number */	tcp_seq		th_ack;			/* acknowledgement number */	u_int8_t	th_offx2;		/* data offset, rsvd */	u_int8_t	th_flags;	u_int16_t	th_win;			/* window */	u_int16_t	th_sum;			/* checksum */	u_int16_t	th_urp;			/* urgent pointer */};#define TH_OFF(th)	(((th)->th_offx2 & 0xf0) >> 4)/* TCP flags */#define	TH_FIN     0x01#define	TH_SYN	   0x02#define	TH_RST	   0x04#define	TH_PUSH	   0x08#define	TH_ACK	   0x10#define	TH_URG	   0x20#define TH_ECNECHO 0x40	/* ECN Echo */#define TH_CWR	   0x80	/* ECN Cwnd Reduced */#define	TCPOPT_EOL		0#define	TCPOPT_NOP		1#define	TCPOPT_MAXSEG		2#define    TCPOLEN_MAXSEG		4#define	TCPOPT_WSCALE		3	/* window scale factor (rfc1323) */#define	TCPOPT_SACKOK		4	/* selective ack ok (rfc2018) */#define	TCPOPT_SACK		5	/* selective ack (rfc2018) */#define	TCPOPT_ECHO		6	/* echo (rfc1072) */#define	TCPOPT_ECHOREPLY	7	/* echo (rfc1072) */#define TCPOPT_TIMESTAMP	8	/* timestamp (rfc1323) */#define    TCPOLEN_TIMESTAMP		10#define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */#define TCPOPT_CC		11	/* T/TCP CC options (rfc1644) */#define TCPOPT_CCNEW		12	/* T/TCP CC options (rfc1644) */#define TCPOPT_CCECHO		13	/* T/TCP CC options (rfc1644) */#define TCPOPT_SIGNATURE	19	/* Keyed MD5 (rfc2385) */#define    TCPOLEN_SIGNATURE		18#define TCP_SIGLEN 16			/* length of an option 19 digest */#define TCPOPT_AUTH             20      /* Enhanced AUTH option */#define TCPOPT_TSTAMP_HDR	\    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)#ifndef TELNET_PORT#define TELNET_PORT             23#endif#ifndef BGP_PORT#define BGP_PORT                179#endif#define NETBIOS_SSN_PORT        139#ifndef PPTP_PORT#define PPTP_PORT	        1723#endif#define BEEP_PORT               10288#ifndef NFS_PORT#define NFS_PORT	        2049#endif#define MSDP_PORT	        639#define LDP_PORT                646#ifndef SMB_PORT#define SMB_PORT                445#endif