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  * SPDX-License-Identifier: BSD-3-Clause
    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  * $FreeBSD$
   33  */
   34 
   35 #ifndef _NETINET_TCP_SEQ_H_
   36 #define _NETINET_TCP_SEQ_H_
   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_SUB(a,b)    ((int)((a)-(b)))
   47 
   48 #define SEQ_MIN(a, b)   ((SEQ_LT(a, b)) ? (a) : (b))
   49 #define SEQ_MAX(a, b)   ((SEQ_GT(a, b)) ? (a) : (b))
   50 
   51 #define WIN_LT(a,b)     (ntohs(a) < ntohs(b))
   52 #define WIN_LEQ(a,b)    (ntohs(a) <= ntohs(b))
   53 #define WIN_GT(a,b)     (ntohs(a) > ntohs(b))
   54 #define WIN_GEQ(a,b)    (ntohs(a) >= ntohs(b))
   55 
   56 #define WIN_MIN(a, b)   ((WIN_LT(a, b)) ? (a) : (b))
   57 #define WIN_MAX(a, b)   ((WIN_GT(a, b)) ? (a) : (b))
   58 
   59 /* for modulo comparisons of timestamps */
   60 #define TSTMP_LT(a,b)   ((int)((a)-(b)) < 0)
   61 #define TSTMP_GT(a,b)   ((int)((a)-(b)) > 0)
   62 #define TSTMP_GEQ(a,b)  ((int)((a)-(b)) >= 0)
   63 
   64 /*
   65  * Macros to initialize tcp sequence numbers for
   66  * send and receive from initial send and receive
   67  * sequence numbers.
   68  */
   69 #define tcp_rcvseqinit(tp) \
   70         (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
   71 
   72 #define tcp_sendseqinit(tp) \
   73         (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
   74             (tp)->snd_recover = (tp)->iss
   75 
   76 #ifdef _KERNEL
   77 /*
   78  * Clock macros for RFC 1323 timestamps.
   79  */
   80 #define TCP_TS_TO_TICKS(_t)     ((_t) * hz / 1000)
   81 
   82 /* Timestamp wrap-around time, 24 days. */
   83 #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * 1000)
   84 
   85 /*
   86  * tcp_ts_getticks() in ms, should be 1ms < x < 1000ms according to RFC 1323.
   87  * We always use 1ms granularity independent of hz.
   88  */
   89 static __inline uint32_t
   90 tcp_ts_getticks(void)
   91 {
   92         struct timeval tv;
   93 
   94         /*
   95          * getmicrouptime() should be good enough for any 1-1000ms granularity.
   96          * Do not use getmicrotime() here as it might break nfsroot/tcp.
   97          */
   98         getmicrouptime(&tv);
   99         return (tv.tv_sec * 1000 + tv.tv_usec / 1000);
  100 }
  101 #endif /* _KERNEL */
  102 
  103 #endif /* _NETINET_TCP_SEQ_H_ */

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