FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp.h
1 /* $NetBSD: tcp.h,v 1.15 2003/08/07 16:33:15 agc Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
32 */
33
34 #ifndef _NETINET_TCP_H_
35 #define _NETINET_TCP_H_
36
37 #include <sys/featuretest.h>
38
39 #if defined(_NETBSD_SOURCE)
40
41 typedef u_int32_t tcp_seq;
42 /*
43 * TCP header.
44 * Per RFC 793, September, 1981.
45 */
46 struct tcphdr {
47 u_int16_t th_sport; /* source port */
48 u_int16_t th_dport; /* destination port */
49 tcp_seq th_seq; /* sequence number */
50 tcp_seq th_ack; /* acknowledgement number */
51 #if BYTE_ORDER == LITTLE_ENDIAN
52 /*LINTED non-portable bitfields*/
53 u_int8_t th_x2:4, /* (unused) */
54 th_off:4; /* data offset */
55 #endif
56 #if BYTE_ORDER == BIG_ENDIAN
57 /*LINTED non-portable bitfields*/
58 u_int8_t th_off:4, /* data offset */
59 th_x2:4; /* (unused) */
60 #endif
61 u_int8_t th_flags;
62 #define TH_FIN 0x01
63 #define TH_SYN 0x02
64 #define TH_RST 0x04
65 #define TH_PUSH 0x08
66 #define TH_ACK 0x10
67 #define TH_URG 0x20
68 u_int16_t th_win; /* window */
69 u_int16_t th_sum; /* checksum */
70 u_int16_t th_urp; /* urgent pointer */
71 } __attribute__((__packed__));
72
73 #define TCPOPT_EOL 0
74 #define TCPOPT_NOP 1
75 #define TCPOPT_MAXSEG 2
76 #define TCPOLEN_MAXSEG 4
77 #define TCPOPT_WINDOW 3
78 #define TCPOLEN_WINDOW 3
79 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
80 #define TCPOLEN_SACK_PERMITTED 2
81 #define TCPOPT_SACK 5 /* Experimental */
82 #define TCPOPT_TIMESTAMP 8
83 #define TCPOLEN_TIMESTAMP 10
84 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
85 #define TCPOPT_MD5SIGNATURE 19 /* RFC 2385 */
86 #define TCPOLEN_MD5SIGNATURE 18
87
88 #define TCPOPT_TSTAMP_HDR \
89 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
90
91 /*
92 * Default maximum segment size for TCP.
93 * With an IP MSS of 576, this is 536,
94 * but 512 is probably more convenient.
95 * This should be defined as min(512, IP_MSS - sizeof (struct tcpiphdr)).
96 */
97 #define TCP_MSS 512
98
99 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
100
101 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
102
103 #define TCP_MAXBURST 4 /* maximum segments in a burst */
104
105 #endif /* _NETBSD_SOURCE */
106
107 /*
108 * User-settable options (used with setsockopt).
109 */
110 #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
111 #define TCP_MAXSEG 0x02 /* set maximum segment size */
112
113 #endif /* _NETINET_TCP_H_ */
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