/* TCP.H

 * 

 */

/** @file

@publishedAll

@released

*/

/*

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

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

#ifndef	_NETINET_TCP_H

#define	_NETINET_TCP_H

#ifdef	__cplusplus

extern "C" {

#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 */

#ifdef _BIT_FIELDS_LTOH

	u_int	th_x2:4,		/* (unused) */

		th_off:4;		/* data offset */

#else

	u_int	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

/**

User-settable options (used with setsockopt).

*/

#define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */

#define	TCP_MAXSEG	0x02	/* set maximum segment size */

#define	TCP_NOTIFY_THRESHOLD		0x10

#define	TCP_ABORT_THRESHOLD		0x11

#define	TCP_CONN_NOTIFY_THRESHOLD	0x12

#define	TCP_CONN_ABORT_THRESHOLD	0x13

#ifdef	__cplusplus

}

#endif

#endif	/* _NETINET_TCP_H */