/* rcsid[]="$Header: tcp.h,v 820.1 86/12/04 19:51:36 root Exp $" */
/* sccsid[]="%W% %Y% %Q% %G%" */

/************************************************************************
*									*
*				Copyright 1984				*
*			VALID LOGIC SYSTEMS INCORPORATED		*
*									*
*	This listing contains confidential proprietary information	*
*	which is not to be disclosed to unauthorized persons without	*
*	written consent of an officer of Valid Logic Systems 		*
*	Incorporated.							*
*									*
*	The copyright notice appearing above is included to provide	*
*	statutory protection in the event of unauthorized or 		*
*	unintentional public disclosure.				*
*									*
************************************************************************/

/*	tcp.h	6.1	83/07/29	*/

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 */
#ifdef vax
	u_char	th_x2:4,		/* (unused) */
		th_off:4;		/* data offset */
#endif
#ifdef s32
	u_char	th_off:4,		/* data offset */
		th_x2:4;		/* (unused) */
#endif s32
	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
