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. 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 u_int8_t th_flags; 49 u_int16_t th_win; /* window */ 50 u_int16_t th_sum; /* checksum */ 51 u_int16_t th_urp; /* urgent pointer */ 52} UNALIGNED; 53 54#define TH_OFF(th) (((th)->th_offx2 & 0xf0) >> 4) 55 56/* TCP flags */ 57#define TH_FIN 0x01 58#define TH_SYN 0x02 59#define TH_RST 0x04 60#define TH_PUSH 0x08 61#define TH_ACK 0x10 62#define TH_URG 0x20 63#define TH_ECNECHO 0x40 /* ECN Echo */ 64#define TH_CWR 0x80 /* ECN Cwnd Reduced */ 65 66 67#define TCPOPT_EOL 0 68#define TCPOPT_NOP 1 69#define TCPOPT_MAXSEG 2 70#define TCPOLEN_MAXSEG 4 71#define TCPOPT_WSCALE 3 /* window scale factor (rfc1323) */ 72#define TCPOPT_SACKOK 4 /* selective ack ok (rfc2018) */ 73#define TCPOPT_SACK 5 /* selective ack (rfc2018) */ 74#define TCPOPT_ECHO 6 /* echo (rfc1072) */ 75#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */ 76#define TCPOPT_TIMESTAMP 8 /* timestamp (rfc1323) */ 77#define TCPOLEN_TIMESTAMP 10 78#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 79#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */ 80#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */ 81#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */ 82#define TCPOPT_SIGNATURE 19 /* Keyed MD5 (rfc2385) */ 83#define TCPOLEN_SIGNATURE 18 84#define TCP_SIGLEN 16 /* length of an option 19 digest */ 85#define TCPOPT_AUTH 20 /* Enhanced AUTH option */ 86#define TCPOPT_UTO 28 /* tcp user timeout (rfc5482) */ 87#define TCPOLEN_UTO 4 88#define TCPOPT_MPTCP 30 /* MPTCP options */ 89#define TCPOPT_EXPERIMENT2 254 /* experimental headers (rfc4727) */ 90 91#define TCPOPT_TSTAMP_HDR \ 92 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 93 94#ifndef TELNET_PORT 95#define TELNET_PORT 23 96#endif 97#ifndef BGP_PORT 98#define BGP_PORT 179 99#endif 100#define NETBIOS_SSN_PORT 139 101#ifndef OPENFLOW_PORT 102#define OPENFLOW_PORT 6633 103#endif 104#ifndef PPTP_PORT 105#define PPTP_PORT 1723 106#endif 107#define BEEP_PORT 10288 108#ifndef NFS_PORT 109#define NFS_PORT 2049 110#endif 111#define MSDP_PORT 639 112#define RPKI_RTR_PORT 323 113#define LDP_PORT 646 114#ifndef SMB_PORT 115#define SMB_PORT 445 116#endif 117