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| 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 | */ |
| 31 | |
| 32 | #ifndef _NETINET_TCP_H |
| 33 | |
| 34 | #define _NETINET_TCP_H 1 |
| 35 | #include <sys/cdefs.h> |
| 36 | |
| 37 | |
| 38 | __BEGIN_DECLS |
| 39 | |
| 40 | typedef unsigned int tcp_seq; |
| 41 | /* |
| 42 | * TCP header. |
| 43 | * Per RFC 793, September, 1981. |
| 44 | */ |
| 45 | struct tcphdr { |
| 46 | unsigned short th_sport; /* source port */ |
| 47 | unsigned short th_dport; /* destination port */ |
| 48 | tcp_seq th_seq; /* sequence number */ |
| 49 | tcp_seq th_ack; /* acknowledgement number */ |
| 50 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
| 51 | unsigned char th_x2:4, /* (unused) */ |
| 52 | th_off:4; /* data offset */ |
| 53 | #endif |
| 54 | #if __BYTE_ORDER == __BIG_ENDIAN |
| 55 | unsigned char th_off:4, /* data offset */ |
| 56 | th_x2:4; /* (unused) */ |
| 57 | #endif |
| 58 | unsigned char th_flags; |
| 59 | #define TH_FIN 0x01 |
| 60 | #define TH_SYN 0x02 |
| 61 | #define TH_RST 0x04 |
| 62 | #define TH_PUSH 0x08 |
| 63 | #define TH_ACK 0x10 |
| 64 | #define TH_URG 0x20 |
| 65 | unsigned short th_win; /* window */ |
| 66 | unsigned short th_sum; /* checksum */ |
| 67 | unsigned short th_urp; /* urgent pointer */ |
| 68 | }; |
| 69 | |
| 70 | #define TCPOPT_EOL 0 |
| 71 | #define TCPOPT_NOP 1 |
| 72 | #define TCPOPT_MAXSEG 2 |
| 73 | #define TCPOLEN_MAXSEG 4 |
| 74 | #define TCPOPT_WINDOW 3 |
| 75 | #define TCPOLEN_WINDOW 3 |
| 76 | #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ |
| 77 | #define TCPOLEN_SACK_PERMITTED 2 |
| 78 | #define TCPOPT_SACK 5 /* Experimental */ |
| 79 | #define TCPOPT_TIMESTAMP 8 |
| 80 | #define TCPOLEN_TIMESTAMP 10 |
| 81 | #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ |
| 82 | |
| 83 | #define TCPOPT_TSTAMP_HDR \ |
| 84 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) |
| 85 | |
| 86 | /* |
| 87 | * Default maximum segment size for TCP. |
| 88 | * With an IP MSS of 576, this is 536, |
| 89 | * but 512 is probably more convenient. |
| 90 | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). |
| 91 | */ |
| 92 | #define TCP_MSS 512 |
| 93 | |
| 94 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
| 95 | |
| 96 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ |
| 97 | |
| 98 | /* |
| 99 | * User-settable options (used with setsockopt). |
| 100 | */ |
| 101 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ |
| 102 | #define TCP_MAXSEG 0x02 /* set maximum segment size */ |
| 103 | |
| 104 | #define SOL_TCP 6 /* TCP level */ |
| 105 | |
| 106 | __END_DECLS |
| 107 | |
| 108 | #endif /* netinet/tcp.h */ |
| 109 |
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