/*
 * $Id: tcp.h,v 1.3 1993/06/30 05:45:25 jraja Exp $
 *
 * HISTORY
 * $Log: tcp.h,v $
 * Revision 1.3  1993/06/30  05:45:25  jraja
 * Changed bitfield definitions to be more like ANSI-C.
 *
 * Revision 1.2  1993/03/03  21:27:41  jraja
 * Added #ifdef to prevent multiple inclusion.
 *
 * Revision 1.1  92/11/17  16:30:05  16:30:05  jraja (Jarno Tapio Rajahalme)
 * Initial revision
 * 
 *
 */

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)tcp.h       7.7 (Berkeley) 6/28/90
 */

/*
 * TCP header.
 * Per RFC 793, September, 1981.
 */

#define TH_FIN  $01
#define TH_SYN  $02
#define TH_RST  $04
#define TH_PUSH $08
#define TH_ACK  $10
#define TH_URG  $20

OBJECT tcphdr
    th_sport:UWORD,               /* source port */
    th_dport:UWORD,               /* destination port */
    th_seq:ULONG,                 /* sequence number */
    th_ack:ULONG,                 /* acknowledgement number */
    th_off:UBYTE,               /* data offset */
    th_x2:UBYTE,                /* (unused) */
    th_flags:UBYTE,
    th_win:UWORD,                 /* window */
    th_sum:UWORD,                 /* checksum */
    th_urp:UWORD                 /* urgent pointer */


#define TCPOPT_EOL      0
#define TCPOPT_NOP      1
#define TCPOPT_MAXSEG   2

/*
 * Default maximum segment size for TCP.
 * With an IP MSS of 576, this is 536,
 * but 512 is probably more convenient.
 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 */
#define TCP_MSS 512

#define TCP_MAXWIN      65535           /* largest value for window */

/*
 * User-settable options (used with setsockopt).
 */
#define TCP_NODELAY     $01    /* don't delay send to coalesce packets */
#define TCP_MAXSEG      $02    /* set maximum segment size */


