#ifndef __TCP_LOADED
#define __TCP_LOADED
/****************************************************************************
**
**  <tcp.h> - TCP descriptions
**
*****************************************************************************
**  Header is nonstandard
*****************************************************************************
**
**  Copyright 2000 Compaq Computer Corporation
**
**  Compaq and the Compaq logo Registered in U.S. Patent and Trademark Office.
**
**  Confidential computer software. Valid license from Compaq required for
**  possession, use or copying. Consistent with FAR 12.211 and 12.212,
**  Commercial Computer Software, Computer Software Documentation, and
**  Technical Data for Commercial Items are licensed to the U.S. Government
**  under vendor's standard commercial license.
**
******************************************************************************
**
**  Copyright (c) 1982 Regents of the University of California.
**  All rights reserved.  The Berkeley software License Agreement
**  specifies the terms and conditions for redistribution.
**
**       @(#)tcp.h 6.3 (Berkeley) 6/8/85
**
******************************************************************************
*/

#pragma __nostandard
#include <decc$types.h>

#ifdef __cplusplus
    extern "C" {
#endif

#if __INITIAL_POINTER_SIZE
#   pragma __pointer_size __save
#   pragma __pointer_size 32
#endif


/*
**  Member align structures
*/
#pragma __member_alignment __save
#pragma __nomember_alignment


/*
**  Disable messages
*/
#pragma __message __save
#pragma __message __disable (__MISALGNDSTRCT)
#pragma __message __disable (__MISALGNDMEM)

#if defined __DECC
#   pragma __message __disable (__BITNOTINT)
#endif

/*
**  Define a caddr_t if not defined elsewhere
*/
#if !defined __CADDR_T && !defined CADDR_T
#   define __CADDR_T 1
#   ifndef __HIDE_FORBIDDEN_NAMES
#      define CADDR_T 1
#   endif
    typedef __caddr_t caddr_t;
#endif


/*
**  Define non-standard BSD socket compatible typedefs
*/
#ifndef __SOCKET_TYPEDEFS
#   define __SOCKET_TYPEDEFS 1
    typedef unsigned char  u_char;
    typedef unsigned short u_short;
    typedef unsigned long  u_long;
#endif

typedef u_long 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 */
                        /* LITTLE_ENDIAN defn     */
    u_char  th_x2:4;    /* (unused)               */
    u_char  th_off:4;   /* data offset            */
    u_char  th_flags;   /*                        */
    u_short th_win;     /* window                 */
    u_short th_sum;     /* checksum               */
    u_short th_urp;     /* urgent pointer         */
};


/*
**  Define th_flags values
*/
#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	   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.
 * For RFC1122 MUST conformance, this needs to be 536.
 * 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		536	/* XXX - BSD4.4lite uses 512 */

#define	TCP_MAXWIN	65535	/* largest value for (unscaled) window */

#define	TCP_MAX_WINSHIFT	14	/* maximum window shift */

/*
 * User-settable options (used with set/getsockopt).
 */
#define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */
#define	TCP_MAXSEG	0x02	/* set maximum segment size */
/* 
 * Number of retransmissions before dropping connection. Larger than  
 * TCP_MAXRXTSHIFT or -1 for infinity 
 */
#define	TCP_RPTR2RXT	0x03	/* set repeat count for R2 RXT timer */ 
#define TCP_KEEPIDLE	0x04	/* seconds before initial keepalive probe */
#define TCP_KEEPINTVL	0x05	/* seconds between keepalive probes */
#define TCP_KEEPCNT	0x06	/* number of keepalive probes before drop */
#define TCP_KEEPINIT	0x07	/* initial connect timeout (seconds) */
#define TCP_PUSH	0x08	/* set push bit in outbound data packets */
#define	TCP_NODELACK	0x09	/* don't delay send to coalesce packets */

/*
**  Restore the users pointer context
*/
#if __INITIAL_POINTER_SIZE
#   pragma __pointer_size __restore
#endif

#ifdef __cplusplus
    }
#endif

#pragma __message __restore
#pragma __member_alignment __restore
#pragma __standard
#endif /* __TCP_LOADED */