bsd/netinet/tcp_seq.h

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