Watt-32 tcp/ip  2.2 dev-rel.10
tcp.h
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1 
5 /* $NetBSD: tcp.h,v 1.8 1995/04/17 05:32:58 cgd Exp $ */
6 
7 /*
8  * Copyright (c) 1982, 1986, 1993
9  * The Regents of the University of California. All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  * notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in the
18  * documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  * must display the following acknowledgement:
21  * This product includes software developed by the University of
22  * California, Berkeley and its contributors.
23  * 4. Neither the name of the University nor the names of its contributors
24  * may be used to endorse or promote products derived from this software
25  * without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37  * SUCH DAMAGE.
38  *
39  * @(#)tcp.h 8.1 (Berkeley) 6/10/93
40  */
41 
42 #ifndef __NETINET_TCP_H
43 #define __NETINET_TCP_H
44 
45 typedef u_long tcp_seq;
46 typedef u_long tcp_cc; /* connection count per rfc1644 */
47 
48 #include <sys/pack_on.h>
49 
50 
51 /*
52  * TCP header.
53  * Per RFC 793, September, 1981.
54  */
55 struct tcphdr {
56  u_short th_sport; /* source port */
57  u_short th_dport; /* destination port */
58  tcp_seq th_seq; /* sequence number */
59  tcp_seq th_ack; /* acknowledgement number */
60  u_char th_x2:4; /* (unused) */
61  u_char th_off:4; /* data offset */
62  u_char th_flags;
63 #define TH_FIN 0x01
64 #define TH_SYN 0x02
65 #define TH_RST 0x04
66 #define TH_PUSH 0x08
67 #define TH_ACK 0x10
68 #define TH_URG 0x20
69 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG)
70 
71  u_short th_win; /* window */
72  u_short th_sum; /* checksum */
73  u_short th_urp; /* urgent pointer */
74 };
75 
76 #include <sys/pack_off.h>
77 
78 #define TCPOPT_EOL 0
79 #define TCPOPT_NOP 1
80 #define TCPOPT_MAXSEG 2
81 #define TCPOLEN_MAXSEG 4
82 #define TCPOPT_WINDOW 3
83 #define TCPOLEN_WINDOW 3
84 #define TCPOPT_SACK_PERMITTED 4
85 #define TCPOLEN_SACK_PERMITTED 2
86 #define TCPOPT_SACK 5
87 #define TCPOPT_TIMESTAMP 8
88 #define TCPOLEN_TIMESTAMP 10
89 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
90 
91 #define TCPOPT_TSTAMP_HDR \
92  (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
93 
94 #define TCPOPT_CC 11 /* CC options: RFC-1644 */
95 #define TCPOPT_CCNEW 12
96 #define TCPOPT_CCECHO 13
97 #define TCPOLEN_CC 6
98 #define TCPOLEN_CC_APPA (TCPOLEN_CC+2)
99 #define TCPOPT_CC_HDR(ccopt) \
100  (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
101 
102 #define TCPOPT_SIGNATURE 19
103 #define TCP_SIGLEN 16
104 
105 /*
106  * Default maximum segment size for TCP.
107  * With an IP MSS of 576, this is 536,
108  * but 512 is probably more convenient.
109  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
110  */
111 #define TCP_MSS 512
112 
113 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
114 #define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */
115 
116 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
117 
118 #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */
119 #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr))
120  /* max space left for options */
121 
122 /*
123  * User-settable options (used with setsockopt).
124  */
125 #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
126 #define TCP_MAXSEG 0x02 /* set maximum segment size */
127 #ifdef TCP_AUTO
128 #define TCP_AUTO_OP 0x03 /* 0 to disable autotuning, 1 to reenable */
129 #endif
130 #define TCP_NOPUSH 0x04 /* don't push last block of write */
131 #define TCP_NOOPT 0x08 /* don't use TCP options */
132 
133 /* For PSC modifications */
134 #if defined(TCP_AUTO) || defined(TCP_SACK) || defined(TCP_FACK)
135 #define PSC_VERSION "0.8"
136 #endif
137 
138 #endif
Definition: tcp.h:55