2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
36 #ifndef _NETINET_TCP_H
37 #define _NETINET_TCP_H 1
39 #include <sys/cdefs.h>
40 #include <sys/types.h>
45 typedef u_int32_t tcp_seq;
48 * Per RFC 793, September, 1981.
51 u_int16_t th_sport; /* source port */
52 u_int16_t th_dport; /* destination port */
53 tcp_seq th_seq; /* sequence number */
54 tcp_seq th_ack; /* acknowledgement number */
55 #if __BYTE_ORDER == __LITTLE_ENDIAN
56 u_int8_t th_x2:4, /* (unused) */
57 th_off:4; /* data offset */
59 #if __BYTE_ORDER == __BIG_ENDIAN
60 u_int8_t th_off:4, /* data offset */
61 th_x2:4; /* (unused) */
70 u_int16_t th_win; /* window */
71 u_int16_t th_sum; /* checksum */
72 u_int16_t th_urp; /* urgent pointer */
75 #else /* !__FAVOR_BSD */
81 #if __BYTE_ORDER == __LITTLE_ENDIAN
91 #elif __BYTE_ORDER == __BIG_ENDIAN
102 #error "Adjust your <bits/endian.h> defines"
108 #endif /* __FAVOR_BSD */
121 TCP_CLOSING /* now a valid state */
126 #define TCPOPT_MAXSEG 2
127 #define TCPOLEN_MAXSEG 4
128 #define TCPOPT_WINDOW 3
129 #define TCPOLEN_WINDOW 3
130 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
131 #define TCPOLEN_SACK_PERMITTED 2
132 #define TCPOPT_SACK 5 /* Experimental */
133 #define TCPOPT_TIMESTAMP 8
134 #define TCPOLEN_TIMESTAMP 10
135 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
137 #define TCPOPT_TSTAMP_HDR \
138 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
141 * Default maximum segment size for TCP.
142 * With an IP MSS of 576, this is 536,
143 * but 512 is probably more convenient.
144 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
148 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
150 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
153 * User-settable options (used with setsockopt).
155 #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
156 #define TCP_MAXSEG 0x02 /* set maximum segment size */
158 #define SOL_TCP 6 /* TCP level */
162 #endif /* netinet/tcp.h */