workbench/network/stacks/AROSTCP/bsdsocket/netinet/tcp_seq.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   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   8.1 (Berkeley) 6/10/93
  34  * $Id$
  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)->iss
  77
  78 #define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
  79
  80 #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * PR_SLOWHZ)
  81                                         /* timestamp wrap-around time */
  82
  83 #ifdef KERNEL
  84 extern int      tcp_iss;                /* tcp initial send seq # */
  85 extern int      tcp_ccgen;              /* global connection count */
  86 #endif
  87 #endif