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tcp_seq.h revision 1.5 
      1 /*	$NetBSD: tcp_seq.h,v 1.5 1994/06/29 06:38:44 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)tcp_seq.h	8.1 (Berkeley) 6/10/93
     36  */
     37 
     38 /*
     39  * TCP sequence numbers are 32 bit integers operated
     40  * on with modular arithmetic.  These macros can be
     41  * used to compare such integers.
     42  */
     43 #define	SEQ_LT(a,b)	((int)((a)-(b)) < 0)
     44 #define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
     45 #define	SEQ_GT(a,b)	((int)((a)-(b)) > 0)
     46 #define	SEQ_GEQ(a,b)	((int)((a)-(b)) >= 0)
     47 
     48 /*
     49  * Macros to initialize tcp sequence numbers for
     50  * send and receive from initial send and receive
     51  * sequence numbers.
     52  */
     53 #define	tcp_rcvseqinit(tp) \
     54 	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
     55 
     56 #define	tcp_sendseqinit(tp) \
     57 	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
     58 	    (tp)->iss
     59 
     60 #define	TCP_ISSINCR	(125*1024)	/* increment for tcp_iss each second */
     61 
     62 #ifdef KERNEL
     63 tcp_seq	tcp_iss;		/* tcp initial send seq # */
     64 #endif
     65