/* TCP.H

  * 

  * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies).

  * All rights reserved.

  */

 /** @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.

 @PublishedAll

 */

 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;

 /**

 @PublishedAll

 */

 #define	TH_FIN	0x01

 /**

 @PublishedAll

 */

 #define	TH_SYN	0x02

 /**

 @PublishedAll

 */

 #define	TH_RST	0x04

 /**

 @PublishedAll

 */

 #define	TH_PUSH	0x08

 /**

 @PublishedAll

 */

 #define	TH_ACK	0x10

 /**

 @PublishedAll

 */

 #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 */