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/*

 * Copyright (c) 1982, 1986 Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 *

 *      @(#)tcp.h       7.5 (Berkeley) 6/29/88

 */

#ifndef _NETINET_IP_TCP_H

#define _NETINET_IP_TCP_H

#include <endian.h>

#include <linux/socket.h>

#include <sys/types.h>

typedef u_int32_t       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 */

#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

        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

/*

 * Default maximum segment size for TCP.

 * With an IP MSS of 576, this is 536,

 * but 512 is probably more convenient.

 */

#ifdef  lint

#define TCP_MSS 536

#else

#define TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))

#endif

#endif /* _NETINET_TCP_H */