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

     /*
      * Copyright (c) 2003, 2004 Jeffrey M. Hsu.  All rights reserved.
      * Copyright (c) 2003, 2004 The DragonFly Project.  All rights reserved.
      *
      * This code is derived from software contributed to The DragonFly Project
      * by Jeffrey M. Hsu.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of The DragonFly Project nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific, prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
     * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * Copyright (c) 1982, 1986, 1993, 1995
     *      The Regents of the University of California.  All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
     * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.7 2003/02/03 02:33:10 hsu Exp $
     * $DragonFly: src/sys/netinet/tcp_seq.h,v 1.10 2007/03/04 18:51:59 swildner Exp $
     */
    
    #ifndef _NETINET_TCP_SEQ_H_
    #define _NETINET_TCP_SEQ_H_
    
    #ifndef _NETINET_TCP_H_
    #include <netinet/tcp.h>
    #endif
    
    /*
     * TCP sequence numbers are 32 bit integers operated
     * on with modular arithmetic.  These macros can be
     * used to compare such integers.
     */
    #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
    #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
    #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
    #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
    
    static __inline tcp_seq
    seq_max(tcp_seq a, tcp_seq b)
    {
            return (SEQ_GT(a, b) ? a : b);
    }
    
    static __inline tcp_seq
    seq_min(tcp_seq a, tcp_seq b)
    {
            return (SEQ_LT(a, b) ? a : b);
    }
    
   /* for modulo comparisons of timestamps */
   #define TSTMP_LT(a,b)   ((int)((a)-(b)) < 0)
   #define TSTMP_GT(a,b)   ((int)((a)-(b)) > 0)
   #define TSTMP_GEQ(a,b)  ((int)((a)-(b)) >= 0)
   
   /*
    * Macros to initialize tcp sequence numbers for
    * send and receive from initial send and receive
    * sequence numbers.
    */
   #define tcp_rcvseqinit(tp) \
           (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
   
   #define tcp_sendseqinit(tp) \
           (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
               (tp)->snd_recover = (tp)->iss
   
   #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * hz)
                                           /* timestamp wrap-around time */
   
   #endif /* _NETINET_TCP_SEQ_H_ */

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