/* TCP_SEQ.H

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

  * All rights reserved.

  */

 /*

  * 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.

  */

 /** @file

 @publishedAll

 @released

 */

 #ifndef	_NETINET_TCP_SEQ_H

 #define	_NETINET_TCP_SEQ_H

 #ifdef	__cplusplus

 extern "C" {

 #endif

 /**

 TCP sequence numbers are 32 bit integers operated

 on with modular arithmetic.  These macros can be

 used to compare such integers.

 */

 #define	SEQ_LT(a, b)	((int)((a)-(b)) < 0)

 #define	SEQ_LEQ(a, b)	((int)((a)-(b)) <= 0)

 #define	SEQ_GT(a, b)	((int)((a)-(b)) > 0)

 #define	SEQ_GEQ(a, b)	((int)((a)-(b)) >= 0)

 /**

 Macros to initialize tcp sequence numbers for

 send and receive from initial send and receive

 sequence numbers.

 */

 #define	tcp_rcvseqinit(tp) \

 	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1

 #define	tcp_sendseqinit(tp) \

 	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \

 	    (tp)->iss

 #define	TCP_ISSINCR	(125*1024)	/* increment for tcp_iss each second */

 #ifdef	__cplusplus

 }

 #endif

 #endif	/* _NETINET_TCP_SEQ_H */