sys/netinet/tcp.h

1.1  cgd /*
1.1  cgd  * Copyright (c) 1982, 1986 Regents of the University of California.
1.1  cgd  * All rights reserved.
1.1  cgd  *
1.1  cgd  * Redistribution and use in source and binary forms, with or without
1.1  cgd  * modification, are permitted provided that the following conditions
1.1  cgd  * are met:
1.1  cgd  * 1. Redistributions of source code must retain the above copyright
1.1  cgd  *    notice, this list of conditions and the following disclaimer.
1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
1.1  cgd  *    documentation and/or other materials provided with the distribution.
1.1  cgd  * 3. All advertising materials mentioning features or use of this software
1.1  cgd  *    must display the following acknowledgement:
1.1  cgd  *	This product includes software developed by the University of
1.1  cgd  *	California, Berkeley and its contributors.
1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
1.1  cgd  *    may be used to endorse or promote products derived from this software
1.1  cgd  *    without specific prior written permission.
1.1  cgd  *
1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1.1  cgd  * SUCH DAMAGE.
1.1  cgd  *
1.1  cgd  *	@(#)tcp.h	7.7 (Berkeley) 6/28/90
1.1  cgd  */
1.1  cgd
1.1  cgd typedef	u_long	tcp_seq;
1.1  cgd /*
1.1  cgd  * TCP header.
1.1  cgd  * Per RFC 793, September, 1981.
1.1  cgd  */
1.1  cgd struct tcphdr {
1.1  cgd 	u_short	th_sport;		/* source port */
1.1  cgd 	u_short	th_dport;		/* destination port */
1.1  cgd 	tcp_seq	th_seq;			/* sequence number */
1.1  cgd 	tcp_seq	th_ack;			/* acknowledgement number */
1.1  cgd #if BYTE_ORDER == LITTLE_ENDIAN
1.1  cgd 	u_char	th_x2:4,		/* (unused) */
1.1  cgd 		th_off:4;		/* data offset */
1.1  cgd #endif
1.1  cgd #if BYTE_ORDER == BIG_ENDIAN
1.1  cgd 	u_char	th_off:4,		/* data offset */
1.1  cgd 		th_x2:4;		/* (unused) */
1.1  cgd #endif
1.1  cgd 	u_char	th_flags;
1.1  cgd #define	TH_FIN	0x01
1.1  cgd #define	TH_SYN	0x02
1.1  cgd #define	TH_RST	0x04
1.1  cgd #define	TH_PUSH	0x08
1.1  cgd #define	TH_ACK	0x10
1.1  cgd #define	TH_URG	0x20
1.1  cgd 	u_short	th_win;			/* window */
1.1  cgd 	u_short	th_sum;			/* checksum */
1.1  cgd 	u_short	th_urp;			/* urgent pointer */
1.1  cgd };
1.1  cgd
1.1  cgd #define	TCPOPT_EOL	0
1.1  cgd #define	TCPOPT_NOP	1
1.1  cgd #define	TCPOPT_MAXSEG	2
1.1  cgd
1.1  cgd /*
1.1  cgd  * Default maximum segment size for TCP.
1.1  cgd  * With an IP MSS of 576, this is 536,
1.1  cgd  * but 512 is probably more convenient.
1.1  cgd  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
1.1  cgd  */
1.1  cgd #define	TCP_MSS	512
1.1  cgd
1.1  cgd #define	TCP_MAXWIN	65535		/* largest value for window */
1.1  cgd
1.1  cgd /*
1.1  cgd  * User-settable options (used with setsockopt).
1.1  cgd  */
1.1  cgd #define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */
1.1  cgd #define	TCP_MAXSEG	0x02	/* set maximum segment size */