xref: /freebsd/contrib/tcpdump/tcp.h (revision 7ef62cebc2f965b0f640263e179276928885e33d)
1 /*
2  * Copyright (c) 1982, 1986, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  *	@(#)tcp.h	8.1 (Berkeley) 6/10/93
34  */
35 
36 /*
37  * TCP header.
38  * Per RFC 793, September, 1981.
39  */
40 struct tcphdr {
41 	nd_uint16_t	th_sport;		/* source port */
42 	nd_uint16_t	th_dport;		/* destination port */
43 	nd_uint32_t	th_seq;			/* sequence number */
44 	nd_uint32_t	th_ack;			/* acknowledgement number */
45 	nd_uint8_t	th_offx2;		/* data offset, rsvd */
46 	nd_uint8_t	th_flags;
47 	nd_uint16_t	th_win;			/* window */
48 	nd_uint16_t	th_sum;			/* checksum */
49 	nd_uint16_t	th_urp;			/* urgent pointer */
50 };
51 
52 #define TH_OFF(th)	((GET_U_1((th)->th_offx2) & 0xf0) >> 4)
53 
54 /* TCP flags */
55 #define	TH_FIN     0x01
56 #define	TH_SYN	   0x02
57 #define	TH_RST	   0x04
58 #define	TH_PUSH	   0x08
59 #define	TH_ACK	   0x10
60 #define	TH_URG	   0x20
61 #define TH_ECNECHO 0x40	/* ECN Echo */
62 #define TH_CWR	   0x80	/* ECN Cwnd Reduced */
63 
64 
65 #define	TCPOPT_EOL		0
66 #define	TCPOPT_NOP		1
67 #define	TCPOPT_MAXSEG		2
68 #define    TCPOLEN_MAXSEG		4
69 #define	TCPOPT_WSCALE		3	/* window scale factor (rfc1323) */
70 #define	TCPOPT_SACKOK		4	/* selective ack ok (rfc2018) */
71 #define	TCPOPT_SACK		5	/* selective ack (rfc2018) */
72 #define	TCPOPT_ECHO		6	/* echo (rfc1072) */
73 #define	TCPOPT_ECHOREPLY	7	/* echo (rfc1072) */
74 #define TCPOPT_TIMESTAMP	8	/* timestamp (rfc1323) */
75 #define    TCPOLEN_TIMESTAMP		10
76 #define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
77 #define TCPOPT_CC		11	/* T/TCP CC options (rfc1644) */
78 #define TCPOPT_CCNEW		12	/* T/TCP CC options (rfc1644) */
79 #define TCPOPT_CCECHO		13	/* T/TCP CC options (rfc1644) */
80 #define TCPOPT_SIGNATURE	19	/* Keyed MD5 (rfc2385) */
81 #define    TCPOLEN_SIGNATURE		18
82 #define TCP_SIGLEN 16			/* length of an option 19 digest */
83 #define TCPOPT_SCPS		20	/* SCPS-TP (CCSDS 714.0-B-2) */
84 #define	TCPOPT_UTO		28	/* tcp user timeout (rfc5482) */
85 #define	   TCPOLEN_UTO			4
86 #define TCPOPT_TCPAO		29	/* TCP authentication option (rfc5925) */
87 #define	TCPOPT_MPTCP		30	/* MPTCP options */
88 #define TCPOPT_FASTOPEN		34	/* TCP Fast Open (rfc7413) */
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 FTP_PORT
95 #define FTP_PORT		21
96 #endif
97 #ifndef SSH_PORT
98 #define SSH_PORT		22
99 #endif
100 #ifndef TELNET_PORT
101 #define TELNET_PORT		23
102 #endif
103 #ifndef SMTP_PORT
104 #define SMTP_PORT		25
105 #endif
106 #ifndef WHOIS_PORT
107 #define WHOIS_PORT		43
108 #endif
109 #ifndef NAMESERVER_PORT
110 #define NAMESERVER_PORT		53
111 #endif
112 #ifndef HTTP_PORT
113 #define HTTP_PORT		80
114 #endif
115 #ifndef NETBIOS_SSN_PORT
116 #define NETBIOS_SSN_PORT	139	/* RFC 1001, RFC 1002 */
117 #endif
118 #ifndef BGP_PORT
119 #define BGP_PORT		179
120 #endif
121 #ifndef RPKI_RTR_PORT
122 #define RPKI_RTR_PORT		323
123 #endif
124 #ifndef SMB_PORT
125 #define SMB_PORT		445
126 #endif
127 #ifndef RTSP_PORT
128 #define RTSP_PORT		554
129 #endif
130 #ifndef MSDP_PORT
131 #define MSDP_PORT		639
132 #endif
133 #ifndef LDP_PORT
134 #define LDP_PORT		646
135 #endif
136 #ifndef PPTP_PORT
137 #define PPTP_PORT		1723
138 #endif
139 #ifndef NFS_PORT
140 #define NFS_PORT		2049
141 #endif
142 #ifndef OPENFLOW_PORT_OLD
143 #define OPENFLOW_PORT_OLD	6633
144 #endif
145 #ifndef OPENFLOW_PORT_IANA
146 #define OPENFLOW_PORT_IANA	6653
147 #endif
148 #ifndef HTTP_PORT_ALT
149 #define HTTP_PORT_ALT		8080
150 #endif
151 #ifndef RTSP_PORT_ALT
152 #define RTSP_PORT_ALT		8554
153 #endif
154 #ifndef BEEP_PORT
155 #define BEEP_PORT		10288
156 #endif
157 #ifndef REDIS_PORT
158 #define REDIS_PORT		6379
159 #endif
160