bsd/netinet/tcp_seq.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1982, 1986, 1993, 1995
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
  55  * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.5 2001/08/22 00:59:12 silby Exp $
  56  */
  57
  58 #ifndef _NETINET_TCP_SEQ_H_
  59 #define _NETINET_TCP_SEQ_H_
  60 #include <sys/appleapiopts.h>
  61 /*
  62  * TCP sequence numbers are 32 bit integers operated
  63  * on with modular arithmetic.  These macros can be
  64  * used to compare such integers.
  65  */
  66 #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
  67 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
  68 #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
  69 #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
  70
  71 #define SEQ_MIN(a, b)   ((SEQ_LT(a, b)) ? (a) : (b))
  72 #define SEQ_MAX(a, b)   ((SEQ_GT(a, b)) ? (a) : (b))
  73
  74 /* for modulo comparisons of timestamps */
  75 #define TSTMP_LT(a,b)   ((int)((a)-(b)) < 0)
  76 #define TSTMP_GEQ(a,b)  ((int)((a)-(b)) >= 0)
  77
  78 /*
  79  * TCP connection counts are 32 bit integers operated
  80  * on with modular arithmetic.  These macros can be
  81  * used to compare such integers.
  82  */
  83 #define CC_LT(a,b)      ((int)((a)-(b)) < 0)
  84 #define CC_LEQ(a,b)     ((int)((a)-(b)) <= 0)
  85 #define CC_GT(a,b)      ((int)((a)-(b)) > 0)
  86 #define CC_GEQ(a,b)     ((int)((a)-(b)) >= 0)
  87
  88 /* Macro to increment a CC: skip 0 which has a special meaning */
  89 #define CC_INC(c)       (++(c) == 0 ? ++(c) : (c))
  90
  91 #ifdef KERNEL_PRIVATE
  92 /*
  93  * Macros to initialize tcp sequence numbers for
  94  * send and receive from initial send and receive
  95  * sequence numbers.
  96  */
  97 #define tcp_rcvseqinit(tp) \
  98         (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
  99
 100 #define tcp_sendseqinit(tp) \
 101         (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
 102         (tp)->snd_recover = (tp)->snd_high = (tp)->iss
 103
 104 #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * PR_SLOWHZ)
 105                                         /* timestamp wrap-around time */
 106
 107 extern tcp_cc   tcp_ccgen;              /* global connection count */
 108 #endif KERNEL_PRIVATE
 109 #endif /* _NETINET_TCP_SEQ_H_ */