bsd/netinet/tcp_seq.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1982, 1986, 1993, 1995
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
  58  * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.5 2001/08/22 00:59:12 silby Exp $
  59  */
  60
  61 #ifndef _NETINET_TCP_SEQ_H_
  62 #define _NETINET_TCP_SEQ_H_
  63 #include <sys/appleapiopts.h>
  64 /*
  65  * TCP sequence numbers are 32 bit integers operated
  66  * on with modular arithmetic.  These macros can be
  67  * used to compare such integers.
  68  */
  69 #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
  70 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
  71 #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
  72 #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
  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 __APPLE_API_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)->iss
 103
 104 #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * PR_SLOWHZ)
 105                                         /* timestamp wrap-around time */
 106 #endif /* __APPLE_API_PRIVATE */
 107
 108 #ifdef KERNEL
 109 #ifdef __APPLE_API_PRIVATE
 110 extern tcp_cc   tcp_ccgen;              /* global connection count */
 111 #endif /* __APPLE_API_PRIVATE */
 112 #endif /* KERNEL */
 113 #endif /* _NETINET_TCP_SEQ_H_ */