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  * 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  *      @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
   34  * $FreeBSD: releng/5.0/sys/netinet/tcp_seq.h 86744 2001-11-21 18:45:51Z jlemon $
   35  */
   36 
   37 #ifndef _NETINET_TCP_SEQ_H_
   38 #define _NETINET_TCP_SEQ_H_
   39 /*
   40  * TCP sequence numbers are 32 bit integers operated
   41  * on with modular arithmetic.  These macros can be
   42  * used to compare such integers.
   43  */
   44 #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
   45 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
   46 #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
   47 #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
   48 
   49 /* for modulo comparisons of timestamps */
   50 #define TSTMP_LT(a,b)   ((int)((a)-(b)) < 0)
   51 #define TSTMP_GEQ(a,b)  ((int)((a)-(b)) >= 0)
   52 
   53 /*
   54  * TCP connection counts are 32 bit integers operated
   55  * on with modular arithmetic.  These macros can be
   56  * used to compare such integers.
   57  */
   58 #define CC_LT(a,b)      ((int)((a)-(b)) < 0)
   59 #define CC_LEQ(a,b)     ((int)((a)-(b)) <= 0)
   60 #define CC_GT(a,b)      ((int)((a)-(b)) > 0)
   61 #define CC_GEQ(a,b)     ((int)((a)-(b)) >= 0)
   62 
   63 /* Macro to increment a CC: skip 0 which has a special meaning */
   64 #define CC_INC(c)       (++(c) == 0 ? ++(c) : (c))
   65 
   66 /*
   67  * Macros to initialize tcp sequence numbers for
   68  * send and receive from initial send and receive
   69  * sequence numbers.
   70  */
   71 #define tcp_rcvseqinit(tp) \
   72         (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
   73 
   74 #define tcp_sendseqinit(tp) \
   75         (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
   76             (tp)->snd_recover = (tp)->iss
   77 
   78 #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * hz)
   79                                         /* timestamp wrap-around time */
   80 
   81 #ifdef _KERNEL
   82 extern tcp_cc   tcp_ccgen;              /* global connection count */
   83 #endif /* _KERNEL */
   84 #endif /* _NETINET_TCP_SEQ_H_ */

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