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 | * 4. Neither the name of the University nor the names of its contributors |
---|
14 | * may be used to endorse or promote products derived from this software |
---|
15 | * without specific prior written permission. |
---|
16 | * |
---|
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
---|
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
---|
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
27 | * SUCH DAMAGE. |
---|
28 | * |
---|
29 | * @(#)tcp.h 8.1 (Berkeley) 6/10/93 |
---|
30 | * $FreeBSD: src/sys/netinet/tcp.h,v 1.30 2005/01/07 01:45:45 imp Exp $ |
---|
31 | */ |
---|
32 | |
---|
33 | |
---|
34 | #ifndef _NETINET_TCP_H_ |
---|
35 | #define _NETINET_TCP_H_ |
---|
36 | |
---|
37 | #include <sys/cdefs.h> |
---|
38 | |
---|
39 | #if __BSD_VISIBLE |
---|
40 | #include <machine/endian.h> /* BYTE_ORDER */ |
---|
41 | |
---|
42 | typedef u_int32_t tcp_seq; |
---|
43 | |
---|
44 | #define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */ |
---|
45 | #define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */ |
---|
46 | |
---|
47 | typedef u_long tcp_cc; /* connection count per rfc1644 */ |
---|
48 | |
---|
49 | /* |
---|
50 | * TCP header. |
---|
51 | * Per RFC 793, September, 1981. |
---|
52 | */ |
---|
53 | struct tcphdr { |
---|
54 | u_short th_sport; /* source port */ |
---|
55 | u_short th_dport; /* destination port */ |
---|
56 | tcp_seq th_seq; /* sequence number */ |
---|
57 | tcp_seq th_ack; /* acknowledgement number */ |
---|
58 | #if BYTE_ORDER == LITTLE_ENDIAN |
---|
59 | u_int th_x2:4, /* (unused) */ |
---|
60 | th_off:4; /* data offset */ |
---|
61 | #endif |
---|
62 | #if BYTE_ORDER == BIG_ENDIAN |
---|
63 | u_int th_off:4, /* data offset */ |
---|
64 | th_x2:4; /* (unused) */ |
---|
65 | #endif |
---|
66 | u_char th_flags; |
---|
67 | #define TH_FIN 0x01 |
---|
68 | #define TH_SYN 0x02 |
---|
69 | #define TH_RST 0x04 |
---|
70 | #define TH_PUSH 0x08 |
---|
71 | #define TH_ACK 0x10 |
---|
72 | #define TH_URG 0x20 |
---|
73 | #define TH_ECE 0x40 |
---|
74 | #define TH_CWR 0x80 |
---|
75 | #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) |
---|
76 | |
---|
77 | u_short th_win; /* window */ |
---|
78 | u_short th_sum; /* checksum */ |
---|
79 | u_short th_urp; /* urgent pointer */ |
---|
80 | }; |
---|
81 | |
---|
82 | #define TCPOPT_EOL 0L |
---|
83 | #define TCPOPT_NOP 1L |
---|
84 | #define TCPOPT_MAXSEG 2L |
---|
85 | #define TCPOLEN_MAXSEG 4L |
---|
86 | #define TCPOPT_WINDOW 3L |
---|
87 | #define TCPOLEN_WINDOW 3L |
---|
88 | #define TCPOPT_SACK_PERMITTED 4L /* Experimental */ |
---|
89 | #define TCPOLEN_SACK_PERMITTED 2L |
---|
90 | #define TCPOPT_SACK 5L /* Experimental */ |
---|
91 | #define TCPOPT_TIMESTAMP 8L |
---|
92 | #define TCPOLEN_TIMESTAMP 10L |
---|
93 | #define TCPOLEN_TSTAMP_APPA (uint32_t)(TCPOLEN_TIMESTAMP+2) /* appendix A */ |
---|
94 | #define TCPOPT_TSTAMP_HDR \ |
---|
95 | (uint32_t)(((uint32_t)TCPOPT_NOP<<24)| \ |
---|
96 | ((uint32_t)TCPOPT_NOP<<16)| \ |
---|
97 | ((uint32_t)TCPOPT_TIMESTAMP<<8)| \ |
---|
98 | ((uint32_t)TCPOLEN_TIMESTAMP)) |
---|
99 | |
---|
100 | #define TCPOPT_CC 11 /* CC options: RFC-1644 */ |
---|
101 | #define TCPOPT_CCNEW 12 |
---|
102 | #define TCPOPT_CCECHO 13 |
---|
103 | #define TCPOLEN_CC 6 |
---|
104 | #define TCPOLEN_CC_APPA (TCPOLEN_CC+2) |
---|
105 | #define TCPOPT_CC_HDR(ccopt) \ |
---|
106 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC) |
---|
107 | |
---|
108 | /* |
---|
109 | * Default maximum segment size for TCP. |
---|
110 | * With an IP MTU of 576, this is 536, |
---|
111 | * but 512 is probably more convenient. |
---|
112 | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). |
---|
113 | */ |
---|
114 | #define TCP_MSS 512 |
---|
115 | |
---|
116 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
---|
117 | #define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */ |
---|
118 | |
---|
119 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ |
---|
120 | |
---|
121 | #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */ |
---|
122 | #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr)) |
---|
123 | /* max space left for options */ |
---|
124 | #endif /* __BSD_VISIBLE */ |
---|
125 | |
---|
126 | /* |
---|
127 | * User-settable options (used with setsockopt). |
---|
128 | */ |
---|
129 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ |
---|
130 | #if __BSD_VISIBLE |
---|
131 | #define TCP_MAXSEG 0x02 /* set maximum segment size */ |
---|
132 | #define TCP_NOPUSH 0x04 /* don't push last block of write */ |
---|
133 | #define TCP_NOOPT 0x08 /* don't use TCP options */ |
---|
134 | #define TCP_MD5SIG 0x10 /* use MD5 digests (RFC2385) */ |
---|
135 | #define TCP_INFO 0x20 /* retrieve tcp_info structure */ |
---|
136 | #endif |
---|
137 | |
---|
138 | #endif /* !_NETINET_TCP_H_ */ |
---|