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 /*      $NetBSD: tcp_seq.h,v 1.16 2005/12/10 23:36:23 elad Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1993, 1995
    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. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
   32  */
   33 
   34 #ifndef _NETINET_TCP_SEQ_H_
   35 #define _NETINET_TCP_SEQ_H_
   36 
   37 /*
   38  * TCP sequence numbers are 32 bit integers operated
   39  * on with modular arithmetic.  These macros can be
   40  * used to compare such integers.
   41  */
   42 #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
   43 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
   44 #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
   45 #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
   46 #define SEQ_MIN(a, b)   ((SEQ_LT(a, b)) ? (a) : (b))
   47 #define SEQ_MAX(a, b)   ((SEQ_GT(a, b)) ? (a) : (b))
   48 
   49 #define SEQ_SUB(a,b)    ((long)((a)-(b)))
   50 
   51 /*
   52  * Macros to initialize tcp sequence numbers for
   53  * send and receive from initial send and receive
   54  * sequence numbers.
   55  */
   56 #define tcp_rcvseqinit(tp) \
   57         (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
   58 
   59 #define tcp_sendseqinit(tp) \
   60         (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
   61             (tp)->snd_recover = (tp)->snd_high = (tp)->iss
   62 
   63 #define TCP_ISS_RANDOM_MASK 0x00ffffff /* bits of randomness in a TCP ISS */
   64 #define TCP_ISSINCR         0x01000000 /* increment per time and per conn */
   65 
   66 #ifdef _KERNEL
   67 extern tcp_seq   tcp_iss_seq;           /* tcp initial seq # */
   68 #endif
   69 
   70 #endif /* !_NETINET_TCP_SEQ_H_ */

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