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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986 Regents of the University of California. | |
3 | * 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 | * | |
78ed81a3 | 33 | * from: @(#)tcp.h 7.7 (Berkeley) 6/28/90 |
34 | * $Id$ | |
15637ed4 RG |
35 | */ |
36 | ||
37 | typedef u_long tcp_seq; | |
38 | /* | |
39 | * TCP header. | |
40 | * Per RFC 793, September, 1981. | |
41 | */ | |
42 | struct tcphdr { | |
43 | u_short th_sport; /* source port */ | |
44 | u_short th_dport; /* destination port */ | |
45 | tcp_seq th_seq; /* sequence number */ | |
46 | tcp_seq th_ack; /* acknowledgement number */ | |
47 | #if BYTE_ORDER == LITTLE_ENDIAN | |
48 | u_char th_x2:4, /* (unused) */ | |
49 | th_off:4; /* data offset */ | |
50 | #endif | |
51 | #if BYTE_ORDER == BIG_ENDIAN | |
52 | u_char th_off:4, /* data offset */ | |
53 | th_x2:4; /* (unused) */ | |
54 | #endif | |
55 | u_char th_flags; | |
56 | #define TH_FIN 0x01 | |
57 | #define TH_SYN 0x02 | |
58 | #define TH_RST 0x04 | |
59 | #define TH_PUSH 0x08 | |
60 | #define TH_ACK 0x10 | |
61 | #define TH_URG 0x20 | |
62 | u_short th_win; /* window */ | |
63 | u_short th_sum; /* checksum */ | |
64 | u_short th_urp; /* urgent pointer */ | |
65 | }; | |
66 | ||
67 | #define TCPOPT_EOL 0 | |
68 | #define TCPOPT_NOP 1 | |
69 | #define TCPOPT_MAXSEG 2 | |
70 | ||
71 | /* | |
72 | * Default maximum segment size for TCP. | |
73 | * With an IP MSS of 576, this is 536, | |
74 | * but 512 is probably more convenient. | |
75 | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). | |
76 | */ | |
77 | #define TCP_MSS 512 | |
78 | ||
79 | #define TCP_MAXWIN 65535 /* largest value for window */ | |
80 | ||
81 | /* | |
82 | * User-settable options (used with setsockopt). | |
83 | */ | |
84 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ | |
85 | #define TCP_MAXSEG 0x02 /* set maximum segment size */ |