| 1 | /** @file
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| 2 | Declarations for TCP.
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| 3 |
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| 4 | Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>
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| 5 | This program and the accompanying materials are licensed and made available under
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| 6 | the terms and conditions of the BSD License that accompanies this distribution.
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| 7 | The full text of the license may be found at
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| 8 | http://opensource.org/licenses/bsd-license.
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| 9 |
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| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 12 |
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| 13 | * Copyright (c) 1982, 1986, 1993
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| 14 | * The Regents of the University of California. All rights reserved.
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| 15 | *
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| 16 | * Redistribution and use in source and binary forms, with or without
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| 17 | * modification, are permitted provided that the following conditions
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| 18 | * are met:
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| 19 | * 1. Redistributions of source code must retain the above copyright
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| 20 | * notice, this list of conditions and the following disclaimer.
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| 21 | * 2. Redistributions in binary form must reproduce the above copyright
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| 22 | * notice, this list of conditions and the following disclaimer in the
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| 23 | * documentation and/or other materials provided with the distribution.
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| 24 | * 3. Neither the name of the University nor the names of its contributors
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| 25 | * may be used to endorse or promote products derived from this software
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| 26 | * without specific prior written permission.
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| 27 | *
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| 28 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 29 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 30 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 32 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 37 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 38 | * SUCH DAMAGE.
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| 39 | *
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| 40 | * @(#)tcp.h 8.1 (Berkeley) 6/10/93
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| 41 | NetBSD: tcp.h,v 1.28 2007/12/25 18:33:47 perry Exp
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| 42 | */
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| 43 | #ifndef _NETINET_TCP_H_
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| 44 | #define _NETINET_TCP_H_
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| 45 |
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| 46 | #include <sys/featuretest.h>
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| 47 |
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| 48 | typedef u_int32_t tcp_seq;
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| 49 |
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| 50 | /* Flag definitions for tcphdr.th_flags */
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| 51 | #define TH_FIN 0x01
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| 52 | #define TH_SYN 0x02
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| 53 | #define TH_RST 0x04
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| 54 | #define TH_PUSH 0x08
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| 55 | #define TH_ACK 0x10
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| 56 | #define TH_URG 0x20
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| 57 | #define TH_ECE 0x40
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| 58 | #define TH_CWR 0x80
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| 59 |
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| 60 | #pragma pack(1)
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| 61 | /*
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| 62 | * TCP header.
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| 63 | * Per RFC 793, September, 1981.
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| 64 | * Updated by RFC 3168, September, 2001.
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| 65 | */
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| 66 | struct tcphdr {
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| 67 | u_int16_t th_sport; /* source port */
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| 68 | u_int16_t th_dport; /* destination port */
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| 69 | tcp_seq th_seq; /* sequence number */
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| 70 | tcp_seq th_ack; /* acknowledgement number */
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| 71 | #if BYTE_ORDER == LITTLE_ENDIAN
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| 72 | /*LINTED non-portable bitfields*/
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| 73 | u_int8_t th_x2:4, /* (unused) */
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| 74 | th_off:4; /* data offset */
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| 75 | #endif
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| 76 | #if BYTE_ORDER == BIG_ENDIAN
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| 77 | /*LINTED non-portable bitfields*/
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| 78 | u_int8_t th_off:4, /* data offset */
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| 79 | th_x2:4; /* (unused) */
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| 80 | #endif
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| 81 | u_int8_t th_flags;
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| 82 | u_int16_t th_win; /* window */
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| 83 | u_int16_t th_sum; /* checksum */
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| 84 | u_int16_t th_urp; /* urgent pointer */
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| 85 | };
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| 86 | #pragma pack()
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| 87 |
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| 88 | #define TCPOPT_EOL 0
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| 89 | #define TCPOPT_NOP 1
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| 90 | #define TCPOPT_MAXSEG 2
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| 91 | #define TCPOLEN_MAXSEG 4
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| 92 | #define TCPOPT_WINDOW 3
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| 93 | #define TCPOLEN_WINDOW 3
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| 94 | #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
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| 95 | #define TCPOLEN_SACK_PERMITTED 2
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| 96 | #define TCPOPT_SACK 5 /* Experimental */
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| 97 | #define TCPOPT_TIMESTAMP 8
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| 98 | #define TCPOLEN_TIMESTAMP 10
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| 99 | #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
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| 100 |
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| 101 | #define TCPOPT_TSTAMP_HDR \
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| 102 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
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| 103 |
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| 104 | #define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */
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| 105 | #define TCPOLEN_SIGNATURE 18
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| 106 | #define TCPOLEN_SIGLEN (TCPOLEN_SIGNATURE+2) /* padding */
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| 107 |
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| 108 | #define MAX_TCPOPTLEN 40 /* max # bytes that go in options */
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| 109 |
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| 110 | /* Default maximum segment size for TCP.
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| 111 | * This is defined by RFC 1112 Sec 4.2.2.6.
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| 112 | */
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| 113 | #define TCP_MSS 536
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| 114 |
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| 115 | #define TCP_MINMSS 216
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| 116 |
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| 117 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
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| 118 |
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| 119 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
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| 120 |
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| 121 | #define TCP_MAXBURST 4 /* maximum segments in a burst */
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| 122 |
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| 123 | /* User-settable options (used with setsockopt). */
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| 124 | #define TCP_NODELAY 1 /* don't delay send to coalesce packets */
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| 125 | #define TCP_MAXSEG 2 /* set maximum segment size */
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| 126 | #define TCP_KEEPIDLE 3
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| 127 |
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| 128 | #ifdef notyet
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| 129 | #define TCP_NOPUSH 4 /* reserved for FreeBSD compat */
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| 130 | #endif
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| 131 |
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| 132 | #define TCP_KEEPINTVL 5
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| 133 | #define TCP_KEEPCNT 6
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| 134 | #define TCP_KEEPINIT 7
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| 135 |
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| 136 | #ifdef notyet
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| 137 | #define TCP_NOOPT 8 /* reserved for FreeBSD compat */
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| 138 | #endif
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| 139 |
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| 140 | #define TCP_MD5SIG 0x10 /* use MD5 digests (RFC2385) */
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| 141 | #define TCP_CONGCTL 0x20 /* selected congestion control */
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| 142 |
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| 143 | #endif /* !_NETINET_TCP_H_ */
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