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tcp_seq.h revision 1.3 
      1 /*
      2  * Copyright (c) 1982, 1986 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	from: @(#)tcp_seq.h	7.4 (Berkeley) 6/28/90
     34  *	$Id: tcp_seq.h,v 1.3 1993/05/20 03:50:37 cgd Exp $
     35  */
     36 
     37 #ifndef _NETINET_TCP_SEQ_H_
     38 #define _NETINET_TCP_SEQ_H_
     39 
     40 /*
     41  * TCP sequence numbers are 32 bit integers operated
     42  * on with modular arithmetic.  These macros can be
     43  * used to compare such integers.
     44  */
     45 #define	SEQ_LT(a,b)	((int)((a)-(b)) < 0)
     46 #define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
     47 #define	SEQ_GT(a,b)	((int)((a)-(b)) > 0)
     48 #define	SEQ_GEQ(a,b)	((int)((a)-(b)) >= 0)
     49 
     50 /*
     51  * Macros to initialize tcp sequence numbers for
     52  * send and receive from initial send and receive
     53  * sequence numbers.
     54  */
     55 #define	tcp_rcvseqinit(tp) \
     56 	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
     57 
     58 #define	tcp_sendseqinit(tp) \
     59 	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
     60 	    (tp)->iss
     61 
     62 #define	TCP_ISSINCR	(125*1024)	/* increment for tcp_iss each second */
     63 
     64 #ifdef KERNEL
     65 tcp_seq	tcp_iss;		/* tcp initial send seq # */
     66 #endif
     67 
     68 #endif /* !_NETINET_TCP_SEQ_H_ */
     69