1 /* 2 * Copyright (c) 1982, 1986, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95 34 * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.7 2003/02/03 02:33:10 hsu Exp $ 35 * $DragonFly: src/sys/netinet/tcp_seq.h,v 1.3 2003/07/23 06:21:01 dillon Exp $ 36 */ 37 38 #ifndef _NETINET_TCP_SEQ_H_ 39 #define _NETINET_TCP_SEQ_H_ 40 /* 41 * TCP sequence numbers are 32 bit integers operated 42 * on with modular arithmetic. These macros can be 43 * used to compare such integers. 44 */ 45 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 46 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 47 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 48 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 49 50 /* for modulo comparisons of timestamps */ 51 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0) 52 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0) 53 54 /* 55 * TCP connection counts are 32 bit integers operated 56 * on with modular arithmetic. These macros can be 57 * used to compare such integers. 58 */ 59 #define CC_LT(a,b) ((int)((a)-(b)) < 0) 60 #define CC_LEQ(a,b) ((int)((a)-(b)) <= 0) 61 #define CC_GT(a,b) ((int)((a)-(b)) > 0) 62 #define CC_GEQ(a,b) ((int)((a)-(b)) >= 0) 63 64 /* Macro to increment a CC: skip 0 which has a special meaning */ 65 #define CC_INC(c) (++(c) == 0 ? ++(c) : (c)) 66 67 /* 68 * Macros to initialize tcp sequence numbers for 69 * send and receive from initial send and receive 70 * sequence numbers. 71 */ 72 #define tcp_rcvseqinit(tp) \ 73 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 74 75 #define tcp_sendseqinit(tp) \ 76 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 77 (tp)->snd_recover = (tp)->iss 78 79 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * hz) 80 /* timestamp wrap-around time */ 81 82 #ifdef _KERNEL 83 extern tcp_cc tcp_ccgen; /* global connection count */ 84 #endif /* _KERNEL */ 85 #endif /* _NETINET_TCP_SEQ_H_ */ 86