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 /*-
    2  * Copyright (c) 1982, 1986, 1993, 1995
    3  *      The Regents of the University of California.  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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
   30  * $FreeBSD: releng/8.2/sys/netinet/tcp_seq.h 199583 2009-11-20 15:27:52Z jhb $
   31  */
   32 
   33 #ifndef _NETINET_TCP_SEQ_H_
   34 #define _NETINET_TCP_SEQ_H_
   35 /*
   36  * TCP sequence numbers are 32 bit integers operated
   37  * on with modular arithmetic.  These macros can be
   38  * used to compare such integers.
   39  */
   40 #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
   41 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
   42 #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
   43 #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
   44 
   45 #define SEQ_MIN(a, b)   ((SEQ_LT(a, b)) ? (a) : (b))
   46 #define SEQ_MAX(a, b)   ((SEQ_GT(a, b)) ? (a) : (b))
   47 
   48 /* for modulo comparisons of timestamps */
   49 #define TSTMP_LT(a,b)   ((int)((a)-(b)) < 0)
   50 #define TSTMP_GT(a,b)   ((int)((a)-(b)) > 0)
   51 #define TSTMP_GEQ(a,b)  ((int)((a)-(b)) >= 0)
   52 
   53 /*
   54  * Macros to initialize tcp sequence numbers for
   55  * send and receive from initial send and receive
   56  * sequence numbers.
   57  */
   58 #define tcp_rcvseqinit(tp) \
   59         (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
   60 
   61 #define tcp_sendseqinit(tp) \
   62         (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
   63             (tp)->snd_recover = (tp)->iss
   64 
   65 #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * hz)
   66                                         /* timestamp wrap-around time */
   67 
   68 #endif /* _NETINET_TCP_SEQ_H_ */

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