RTEMS CPU Kit with SuperCore  4.11.3
tcp.h
Go to the documentation of this file.
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_ */
Generated by   doxygen 1.8.13