1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95 32 * $FreeBSD$ 33 */ 34 35 #ifndef _NETINET_TCP_SEQ_H_ 36 #define _NETINET_TCP_SEQ_H_ 37 /* 38 * TCP sequence numbers are 32 bit integers operated 39 * on with modular arithmetic. These macros can be 40 * used to compare such integers. 41 */ 42 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 43 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 44 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 45 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 46 47 #define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b)) 48 #define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b)) 49 50 /* for modulo comparisons of timestamps */ 51 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0) 52 #define TSTMP_GT(a,b) ((int)((a)-(b)) > 0) 53 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0) 54 55 /* 56 * Macros to initialize tcp sequence numbers for 57 * send and receive from initial send and receive 58 * sequence numbers. 59 */ 60 #define tcp_rcvseqinit(tp) \ 61 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 62 63 #define tcp_sendseqinit(tp) \ 64 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 65 (tp)->snd_recover = (tp)->iss 66 67 #ifdef _KERNEL 68 /* 69 * Clock macros for RFC 1323 timestamps. 70 */ 71 #define TCP_TS_TO_TICKS(_t) ((_t) * hz / 1000) 72 73 /* Timestamp wrap-around time, 24 days. */ 74 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * 1000) 75 76 /* 77 * tcp_ts_getticks() in ms, should be 1ms < x < 1000ms according to RFC 1323. 78 * We always use 1ms granularity independent of hz. 79 */ 80 static __inline uint32_t 81 tcp_ts_getticks(void) 82 { 83 struct timeval tv; 84 85 /* 86 * getmicrouptime() should be good enough for any 1-1000ms granularity. 87 * Do not use getmicrotime() here as it might break nfsroot/tcp. 88 */ 89 getmicrouptime(&tv); 90 return (tv.tv_sec * 1000 + tv.tv_usec / 1000); 91 } 92 #endif /* _KERNEL */ 93 94 #endif /* _NETINET_TCP_SEQ_H_ */ 95