/*
 * $Header: /smsa/bsd:include/netinet/tcp_seq.h:bsd  1.7  $
 * $Source: /smsa/bsd:include/netinet/tcp_seq.h: $
 *
 * Copyright (c) 1988 Acorn Computers Ltd., Cambridge, England
 */
/*	@(#)tcp_seq.h	2.1 88/05/18 4.0NFSSRC SMI;	from UCB 7.1 6/5/86	*/
/*
 * 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
 */

#ifndef __netinet_tcp_seq_h
#define __netinet_tcp_seq_h

/*
 * 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

#endif/*__netinet_tcp_seq_h*/

/* EOF tcp_seq.h */
