/*
 * 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.
 *
 */   

#ifndef NETINET_TCP_H
#define NETINET_TCP_H

typedef uint32 tcp_seq;

struct tcphdr {
	uint16 th_sport;        /* src port */
	uint16 th_dport;        /* dest. port */
	tcp_seq th_seq;         /* seq number */
	tcp_seq th_ack;         /* ack number */
	
#if B_HOST_IS_BENDIAN
	uint8 th_off:4,
	      th_x2:4;
#else
	uint8 th_x2:4,          /* unused */
	      th_off:4;         /* data offset */
#endif
	uint8  th_flags;        /* ACK, FIN, PUSH, RST, SYN, URG */
	uint16 th_win;          /* advertised window */
	uint16 th_sum;          /* checksum */
	uint16 th_urp;          /* urgent offset */
} _PACKED;

#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	TCPOPT_EOL              0
#define	TCPOPT_NOP              1
#define	TCPOPT_MAXSEG           2
#define	TCPOPT_WINDOW           3
#define	TCPOPT_SACK_PERMITTED   4    /* Experimental */
#define	TCPOPT_SACK             5    /* Experimental */
#define	TCPOPT_TIMESTAMP        8
#define	TCPOPT_SIGNATURE       19

#define	MAX_TCPOPTLEN          40    /* Absolute maximum TCP options len */

#define	TCPOLEN_MAXSEG		    4
#define	TCPOLEN_WINDOW          3
#define	TCPOLEN_SACK            8    /* 2*sizeof(tcp_seq) */
#define	TCPOLEN_SACK_PERMITTED  2
#define	TCPOLEN_TIMESTAMP      10
#define	TCPOLEN_TSTAMP_APPA    (TCPOLEN_TIMESTAMP+2) /* appendix A */
#define	TCPOLEN_SIGNATURE      18

#define TCPOPT_TSTAMP_HDR	\
    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)

#define TCP_MSS           512
#define TCP_MAXWIN        65535
#define TCP_MAX_WINSHIFT  14


#endif /* NETINET_TCP_H */
