1 /* 2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Jeffrey M. Hsu. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The DragonFly Project nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific, prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1993, 1995 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95 67 * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.7 2003/02/03 02:33:10 hsu Exp $ 68 * $DragonFly: src/sys/netinet/tcp_seq.h,v 1.10 2007/03/04 18:51:59 swildner Exp $ 69 */ 70 71 #ifndef _NETINET_TCP_SEQ_H_ 72 #define _NETINET_TCP_SEQ_H_ 73 74 #ifndef _NETINET_TCP_H_ 75 #include <netinet/tcp.h> 76 #endif 77 78 /* 79 * TCP sequence numbers are 32 bit integers operated 80 * on with modular arithmetic. These macros can be 81 * used to compare such integers. 82 */ 83 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 84 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 85 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 86 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 87 88 static __inline tcp_seq 89 seq_max(tcp_seq a, tcp_seq b) 90 { 91 return (SEQ_GT(a, b) ? a : b); 92 } 93 94 static __inline tcp_seq 95 seq_min(tcp_seq a, tcp_seq b) 96 { 97 return (SEQ_LT(a, b) ? a : b); 98 } 99 100 /* for modulo comparisons of timestamps */ 101 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0) 102 #define TSTMP_GT(a,b) ((int)((a)-(b)) > 0) 103 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0) 104 105 /* 106 * Macros to initialize tcp sequence numbers for 107 * send and receive from initial send and receive 108 * sequence numbers. 109 */ 110 #define tcp_rcvseqinit(tp) \ 111 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 112 113 #define tcp_sendseqinit(tp) \ 114 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 115 (tp)->snd_recover = (tp)->iss 116 117 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * hz) 118 /* timestamp wrap-around time */ 119 120 #endif /* _NETINET_TCP_SEQ_H_ */ 121