/* IBM_PROLOG_BEGIN_TAG                                                   */
/* This is an automatically generated prolog.                             */
/*                                                                        */
/* bos720 src/bos/kernext/inet/tcp_seq.h 1.12                             */
/*                                                                        */
/* Licensed Materials - Property of IBM                                   */
/*                                                                        */
/* COPYRIGHT International Business Machines Corp. 1988,1993              */
/* All Rights Reserved                                                    */
/*                                                                        */
/* US Government Users Restricted Rights - Use, duplication or            */
/* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.      */
/*                                                                        */
/* IBM_PROLOG_END_TAG                                                     */
/* @(#)59	1.12  src/bos/kernext/inet/tcp_seq.h, sysxinet_tcp, bos720 10/31/00 10:59:46 */
/*
 *   COMPONENT_NAME: SYSXINET
 *
 *   FUNCTIONS: SEQ_GEQ
 *		SEQ_GT
 *		SEQ_LEQ
 *		SEQ_LT
 *		tcp_rcvseqinit
 *		tcp_sendseqinit
 *		
 *
 *   ORIGINS: 26,27,85,127,196
 *
 *
 *   (C) COPYRIGHT International Business Machines Corp. 1988,1997
 *   All Rights Reserved
 *   Licensed Materials - Property of IBM
 *   US Government Users Restricted Rights - Use, duplication or
 *   disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

/*
 * (c) Copyright 1990, 1991, 1992, 1993 OPEN SOFTWARE FOUNDATION, INC. 
 * ALL RIGHTS RESERVED 
 */
/*
 * OSF/1 1.2
 */
/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	Base:	tcp_seq.h	7.3 (Berkeley) 6/29/88
 *	Merged:	tcp_seq.h	7.4 (Berkeley) 6/28/90
 */

/*
 * 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)->snd_high = (tp)->snd_ecn_max = (tp)->snd_ecn_clear = (tp)->iss

/* XXX: I'm not sure if the _KERNEL difference is necessary here.... */
/*
 * Increment for tcp_iss each second.
 */
#ifdef notyet
#define	TCP_ISSINCR	((125*1024) + (inetrandom() & 0x1ffff)) 
#else
#define	TCP_ISSINCR	(125*1024)
#endif

#ifdef _KERNEL
extern	tcp_seq	tcp_iss;		/* tcp initial send seq # */
#endif