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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1982, 1986, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)tcp.h 8.1 (Berkeley) 6/10/93
59: */
60:
61: typedef u_long tcp_seq;
62: /*
63: * TCP header.
64: * Per RFC 793, September, 1981.
65: */
66: struct tcphdr {
67: u_short th_sport; /* source port */
68: u_short th_dport; /* destination port */
69: tcp_seq th_seq; /* sequence number */
70: tcp_seq th_ack; /* acknowledgement number */
71: #if BYTE_ORDER == LITTLE_ENDIAN
72: u_char th_x2:4, /* (unused) */
73: th_off:4; /* data offset */
74: #endif
75: #if BYTE_ORDER == BIG_ENDIAN
76: u_char th_off:4, /* data offset */
77: th_x2:4; /* (unused) */
78: #endif
79: u_char th_flags;
80: #define TH_FIN 0x01
81: #define TH_SYN 0x02
82: #define TH_RST 0x04
83: #define TH_PUSH 0x08
84: #define TH_ACK 0x10
85: #define TH_URG 0x20
86: u_short th_win; /* window */
87: u_short th_sum; /* checksum */
88: u_short th_urp; /* urgent pointer */
89: };
90:
91: #define TCPOPT_EOL 0
92: #define TCPOPT_NOP 1
93: #define TCPOPT_MAXSEG 2
94: #define TCPOLEN_MAXSEG 4
95: #define TCPOPT_WINDOW 3
96: #define TCPOLEN_WINDOW 3
97: #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
98: #define TCPOLEN_SACK_PERMITTED 2
99: #define TCPOPT_SACK 5 /* Experimental */
100: #define TCPOPT_TIMESTAMP 8
101: #define TCPOLEN_TIMESTAMP 10
102: #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
103:
104: #define TCPOPT_TSTAMP_HDR \
105: (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
106:
107: /*
108: * Default maximum segment size for TCP.
109: * With an IP MSS of 576, this is 536,
110: * but 512 is probably more convenient.
111: * This should be defined as min(512, IP_MSS - sizeof (struct tcpiphdr)).
112: */
113: #define TCP_MSS 512
114:
115: #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
116:
117: #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
118:
119: /*
120: * User-settable options (used with setsockopt).
121: */
122: #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
123: #define TCP_MAXSEG 0x02 /* set maximum segment size */
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