The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_seq.h

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    1 /*      $OpenBSD: tcp_seq.h,v 1.6 2007/06/15 18:23:06 markus Exp $      */
    2 /*      $NetBSD: tcp_seq.h,v 1.6 1995/03/26 20:32:35 jtc Exp $  */
    3 
    4 /*
    5  * Copyright (c) 1982, 1986, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)tcp_seq.h   8.1 (Berkeley) 6/10/93
   33  */
   34 
   35 #ifndef _NETINET_TCP_SEQ_H_
   36 #define _NETINET_TCP_SEQ_H_
   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 #define TCP_ISSINCR2    (1*1024*1024)   /* increment for tcp_iss each second */
   62 
   63 #ifdef _KERNEL
   64 extern tcp_seq  tcp_iss;                /* tcp initial send seq # */
   65 #endif /* _KERNEL */
   66 #endif /* _NETINET_TCP_SEQ_H_ */

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