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/*

 * Copyright (c) 1982, 1986, 1993

 *      The 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       8.1 (Berkeley) 6/10/93

 * $Id: tcp.h,v 1.2 2001-09-27 12:01:56 chris Exp $

 */

#ifndef _NETINET_TCP_H_

#define _NETINET_TCP_H_

typedef u_long  tcp_seq;

typedef u_long  tcp_cc;                 /* connection count per rfc1644 */

/*

 * TCP header.

 * Per RFC 793, September, 1981.

 */

struct tcphdr {

        u_short th_sport;               /* source port */

        u_short th_dport;               /* destination port */

        tcp_seq th_seq;                 /* sequence number */

        tcp_seq th_ack;                 /* acknowledgement number */

#if BYTE_ORDER == LITTLE_ENDIAN

        u_char  th_x2:4,                /* (unused) */

                th_off:4;               /* data offset */

#endif

#if BYTE_ORDER == BIG_ENDIAN

        u_char  th_off:4,               /* data offset */

                th_x2:4;                /* (unused) */

#endif

        u_char  th_flags;

#define TH_FIN  0x01

#define TH_SYN  0x02

#define TH_RST  0x04

#define TH_PUSH 0x08

#define TH_ACK  0x10

#define TH_URG  0x20

#define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG)

        u_short th_win;                 /* window */

        u_short th_sum;                 /* checksum */

        u_short th_urp;                 /* urgent pointer */

};

#define TCPOPT_EOL              0

#define TCPOPT_NOP              1

#define TCPOPT_MAXSEG           2

#define    TCPOLEN_MAXSEG               4

#define TCPOPT_WINDOW           3

#define    TCPOLEN_WINDOW               3

#define TCPOPT_SACK_PERMITTED   4               /* Experimental */

#define    TCPOLEN_SACK_PERMITTED       2

#define TCPOPT_SACK             5               /* Experimental */

#define TCPOPT_TIMESTAMP        8

#define    TCPOLEN_TIMESTAMP            10

#define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */

#define    TCPOPT_TSTAMP_HDR            \

    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)

#define TCPOPT_CC               11              /* CC options: RFC-1644 */

#define TCPOPT_CCNEW            12

#define TCPOPT_CCECHO           13

#define    TCPOLEN_CC                   6

#define    TCPOLEN_CC_APPA              (TCPOLEN_CC+2)

#define    TCPOPT_CC_HDR(ccopt)         \

    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)

/*

 * 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 (unscaled) window */

#define TTCP_CLIENT_SND_WND     4096    /* dflt send window for T/TCP client */

#define TCP_MAX_WINSHIFT        14      /* maximum window shift */

#define TCP_MAXHLEN     (0xf<<2)        /* max length of header in bytes */

#define TCP_MAXOLEN     (TCP_MAXHLEN - sizeof(struct tcphdr))

                                        /* max space left for options */

/*

 * User-settable options (used with setsockopt).

 */

#define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */

#define TCP_MAXSEG      0x02    /* set maximum segment size */

#define TCP_NOPUSH      0x04    /* don't push last block of write */

#define TCP_NOOPT       0x08    /* don't use TCP options */

#endif