bsd/netinet/tcp_seq.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1982, 1986, 1993, 1995
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
  61  * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.5 2001/08/22 00:59:12 silby Exp $
  62  */
  63
  64 #ifndef _NETINET_TCP_SEQ_H_
  65 #define _NETINET_TCP_SEQ_H_
  66 #include <sys/appleapiopts.h>
  67 /*
  68  * TCP sequence numbers are 32 bit integers operated
  69  * on with modular arithmetic.  These macros can be
  70  * used to compare such integers.
  71  */
  72 #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
  73 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
  74 #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
  75 #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
  76
  77 #define SEQ_MIN(a, b)   ((SEQ_LT(a, b)) ? (a) : (b))
  78 #define SEQ_MAX(a, b)   ((SEQ_GT(a, b)) ? (a) : (b))
  79
  80 /* for modulo comparisons of timestamps */
  81 #define TSTMP_LT(a,b)   ((int)((a)-(b)) < 0)
  82 #define TSTMP_GT(a,b)   ((int)((a)-(b)) > 0)
  83 #define TSTMP_LEQ(a,b)  ((int)((a)-(b)) <= 0)
  84 #define TSTMP_GEQ(a,b)  ((int)((a)-(b)) >= 0)
  85
  86 /*
  87  * TCP connection counts are 32 bit integers operated
  88  * on with modular arithmetic.  These macros can be
  89  * used to compare such integers.
  90  */
  91 #define CC_LT(a,b)      ((int)((a)-(b)) < 0)
  92 #define CC_LEQ(a,b)     ((int)((a)-(b)) <= 0)
  93 #define CC_GT(a,b)      ((int)((a)-(b)) > 0)
  94 #define CC_GEQ(a,b)     ((int)((a)-(b)) >= 0)
  95
  96 /* Macro to increment a CC: skip 0 which has a special meaning */
  97 #define CC_INC(c)       (++(c) == 0 ? ++(c) : (c))
  98
  99 #ifdef KERNEL_PRIVATE
 100 /*
 101  * Macros to initialize tcp sequence numbers for
 102  * send and receive from initial send and receive
 103  * sequence numbers.
 104  */
 105 #define tcp_rcvseqinit(tp) \
 106         (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
 107
 108 #define tcp_sendseqinit(tp) \
 109         (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
 110         (tp)->snd_recover = (tp)->iss
 111
 112 #define TCP_PAWS_IDLE   (24 * 24 * 60 * 60 * TCP_RETRANSHZ)
 113                                         /* timestamp wrap-around time */
 114
 115 extern tcp_cc   tcp_ccgen;              /* global connection count */
 116 #endif /* KERNEL_PRIVATE */
 117 #endif /* _NETINET_TCP_SEQ_H_ */