Annotation of sys/netinet/tcp.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: tcp.h,v 1.17 2006/04/27 02:19:32 tedu Exp $ */
! 2: /* $NetBSD: tcp.h,v 1.8 1995/04/17 05:32:58 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1982, 1986, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)tcp.h 8.1 (Berkeley) 6/10/93
! 33: */
! 34:
! 35: #ifndef _NETINET_TCP_H_
! 36: #define _NETINET_TCP_H_
! 37:
! 38: typedef u_int32_t tcp_seq;
! 39:
! 40: /*
! 41: * TCP header.
! 42: * Per RFC 793, September, 1981.
! 43: */
! 44: struct tcphdr {
! 45: u_int16_t th_sport; /* source port */
! 46: u_int16_t th_dport; /* destination port */
! 47: tcp_seq th_seq; /* sequence number */
! 48: tcp_seq th_ack; /* acknowledgement number */
! 49: #if _BYTE_ORDER == _LITTLE_ENDIAN
! 50: u_int th_x2:4, /* (unused) */
! 51: th_off:4; /* data offset */
! 52: #endif
! 53: #if _BYTE_ORDER == _BIG_ENDIAN
! 54: u_int th_off:4, /* data offset */
! 55: th_x2:4; /* (unused) */
! 56: #endif
! 57: u_int8_t th_flags;
! 58: #define TH_FIN 0x01
! 59: #define TH_SYN 0x02
! 60: #define TH_RST 0x04
! 61: #define TH_PUSH 0x08
! 62: #define TH_ACK 0x10
! 63: #define TH_URG 0x20
! 64: #define TH_ECE 0x40
! 65: #define TH_CWR 0x80
! 66: u_int16_t th_win; /* window */
! 67: u_int16_t th_sum; /* checksum */
! 68: u_int16_t th_urp; /* urgent pointer */
! 69: };
! 70: #define th_reseqlen th_urp /* TCP data length for
! 71: resequencing/reassembly */
! 72:
! 73: #define TCPOPT_EOL 0
! 74: #define TCPOPT_NOP 1
! 75: #define TCPOPT_MAXSEG 2
! 76: #define TCPOLEN_MAXSEG 4
! 77: #define TCPOPT_WINDOW 3
! 78: #define TCPOLEN_WINDOW 3
! 79: #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
! 80: #define TCPOLEN_SACK_PERMITTED 2
! 81: #define TCPOPT_SACK 5 /* Experimental */
! 82: #define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */
! 83: #define TCPOPT_TIMESTAMP 8
! 84: #define TCPOLEN_TIMESTAMP 10
! 85: #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
! 86: #define TCPOPT_SIGNATURE 19
! 87: #define TCPOLEN_SIGNATURE 18
! 88: #define TCPOLEN_SIGLEN (TCPOLEN_SIGNATURE+2) /* padding */
! 89:
! 90: #define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */
! 91:
! 92: #define TCPOPT_TSTAMP_HDR \
! 93: (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
! 94:
! 95: /* Option definitions */
! 96: #define TCPOPT_SACK_PERMIT_HDR \
! 97: (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)
! 98: #define TCPOPT_SACK_HDR (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8)
! 99: /* Miscellaneous constants */
! 100: #define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at sender side */
! 101: #define TCP_MAX_SACK 3 /* MAX # SACKs sent in any segment */
! 102:
! 103: #define TCP_MAXBURST 4 /* Max # packets after leaving Fast Rxmit */
! 104:
! 105: /*
! 106: * Default maximum segment size for TCP.
! 107: * With an IP MSS of 576, this is 536,
! 108: * but 512 is probably more convenient.
! 109: * This should be defined as min(512, IP_MSS - sizeof (struct tcpiphdr)).
! 110: */
! 111: #define TCP_MSS 512
! 112:
! 113: #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
! 114:
! 115: #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
! 116:
! 117: /*
! 118: * User-settable options (used with setsockopt).
! 119: */
! 120: #define TCP_NODELAY 0x01 /* don't delay send to coalesce pkts */
! 121: #define TCP_MAXSEG 0x02 /* set maximum segment size */
! 122: #define TCP_MD5SIG 0x04 /* enable TCP MD5 signature option */
! 123: #define TCP_SACK_ENABLE 0x08 /* enable SACKs (if disabled by def.) */
! 124:
! 125: #endif /* _NETINET_TCP_H_ */
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