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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95 30 * $FreeBSD$ 31 */ 32 33 #ifndef _NETINET_TCP_SEQ_H_ 34 #define _NETINET_TCP_SEQ_H_ 35 /* 36 * TCP sequence numbers are 32 bit integers operated 37 * on with modular arithmetic. These macros can be 38 * used to compare such integers. 39 */ 40 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 41 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 42 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 43 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 44 45 #define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b)) 46 #define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b)) 47 48 /* for modulo comparisons of timestamps */ 49 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0) 50 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0) 51 52 /* 53 * TCP connection counts are 32 bit integers operated 54 * on with modular arithmetic. These macros can be 55 * used to compare such integers. 56 */ 57 #define CC_LT(a,b) ((int)((a)-(b)) < 0) 58 #define CC_LEQ(a,b) ((int)((a)-(b)) <= 0) 59 #define CC_GT(a,b) ((int)((a)-(b)) > 0) 60 #define CC_GEQ(a,b) ((int)((a)-(b)) >= 0) 61 62 /* Macro to increment a CC: skip 0 which has a special meaning */ 63 #define CC_INC(c) (++(c) == 0 ? ++(c) : (c)) 64 65 /* 66 * Macros to initialize tcp sequence numbers for 67 * send and receive from initial send and receive 68 * sequence numbers. 69 */ 70 #define tcp_rcvseqinit(tp) \ 71 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 72 73 #define tcp_sendseqinit(tp) \ 74 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 75 (tp)->snd_recover = (tp)->iss 76 77 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * hz) 78 /* timestamp wrap-around time */ 79 80 #ifdef _KERNEL 81 extern tcp_cc tcp_ccgen; /* global connection count */ 82 #endif /* _KERNEL */ 83 #endif /* _NETINET_TCP_SEQ_H_ */ 84