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 33 typedef u_int32_t tcp_seq; 34 /* 35 * TCP header. 36 * Per RFC 793, September, 1981. 37 */ 38 struct 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 #define TCPOPT_MPTCP 30 /* MPTCP options */ 85 #define TCPOPT_EXPERIMENT2 254 /* experimental headers (rfc4727) */ 86 87 #define TCPOPT_TSTAMP_HDR \ 88 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 89 90 #ifndef TELNET_PORT 91 #define TELNET_PORT 23 92 #endif 93 #ifndef BGP_PORT 94 #define BGP_PORT 179 95 #endif 96 #define NETBIOS_SSN_PORT 139 97 #ifndef OPENFLOW_PORT 98 #define OPENFLOW_PORT 6633 99 #endif 100 #ifndef PPTP_PORT 101 #define PPTP_PORT 1723 102 #endif 103 #define BEEP_PORT 10288 104 #ifndef NFS_PORT 105 #define NFS_PORT 2049 106 #endif 107 #define MSDP_PORT 639 108 #define RPKI_RTR_PORT 323 109 #define LDP_PORT 646 110 #ifndef SMB_PORT 111 #define SMB_PORT 445 112 #endif 113