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