/*
 * 5799-WZQ (C) COPYRIGHT = NONE
 * LICENSED MATERIALS - PROPERTY OF IBM
 */
/* $Header:tcp_seq.h 12.0$ */
/* $ACIS:tcp_seq.h 12.0$ */
/* $Source: /ibm/acis/usr/sys/netinet/RCS/tcp_seq.h,v $ */

#if !defined(lint) && !defined(LOCORE) && defined(RCS_HDRS)
static char *rcsidtcp_seq = "$Header:tcp_seq.h 12.0$";
#endif

/*
 * 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.
 *
 *	@(#)tcp_seq.h	7.1 (Berkeley) 6/5/86
 */

/*
 * 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 KERNEL
tcp_seq	tcp_iss;		/* tcp initial send seq # */
#endif
