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)->rcv_high = (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 #endif /* KERNEL_PRIVATE */ 115 #endif /* _NETINET_TCP_SEQ_H_ */ 116