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TCP.H

/*
 * 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
 */

#ifndef NETINET_TCP_H
#define NETINET_TCP_H

typedef     u_int tcp_seq;
/*
 * 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 */

      u_char      th_x2:4,          /* (unused) */
            th_off:4;         /* data offset */
      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
      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)

/*
 * 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 TCP_MAX_WINSHIFT      14    /* maximum window shift */

/*
 * User-settable options (used with setsockopt).
 */
#ifndef TCP_NODELAY
#define     TCP_NODELAY 0x01  /* don't delay send to coalesce packets */
#endif
#ifndef TCP_MAXSEG
#define     TCP_MAXSEG  0x02  /* set maximum segment size */
#endif

#endif /* NETINET_TCP_H */

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