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 32 #ifndef _NETINET_TCP_SEQ_H_ 33 #define _NETINET_TCP_SEQ_H_ 34 /* 35 * TCP sequence numbers are 32 bit integers operated 36 * on with modular arithmetic. These macros can be 37 * used to compare such integers. 38 */ 39 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 40 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 41 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 42 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 43 #define SEQ_SUB(a,b) ((int)((a)-(b))) 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 #define WIN_LT(a,b) (ntohs(a) < ntohs(b)) 49 #define WIN_LEQ(a,b) (ntohs(a) <= ntohs(b)) 50 #define WIN_GT(a,b) (ntohs(a) > ntohs(b)) 51 #define WIN_GEQ(a,b) (ntohs(a) >= ntohs(b)) 52 53 #define WIN_MIN(a, b) ((WIN_LT(a, b)) ? (a) : (b)) 54 #define WIN_MAX(a, b) ((WIN_GT(a, b)) ? (a) : (b)) 55 56 /* for modulo comparisons of timestamps */ 57 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0) 58 #define TSTMP_GT(a,b) ((int)((a)-(b)) > 0) 59 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0) 60 61 /* 62 * Macros to initialize tcp sequence numbers for 63 * send and receive from initial send and receive 64 * sequence numbers. 65 */ 66 #define tcp_rcvseqinit(tp) \ 67 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 68 69 #define tcp_sendseqinit(tp) \ 70 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 71 (tp)->snd_recover = (tp)->iss 72 73 #ifdef _KERNEL 74 /* 75 * Clock macros for RFC 1323 timestamps. 76 */ 77 #define TCP_TS_TO_TICKS(_t) ((_t) * hz / 1000) 78 79 /* Timestamp wrap-around time, 24 days. */ 80 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * 1000) 81 82 /* 83 * tcp_ts_getticks() in ms, should be 1ms < x < 1000ms according to RFC 1323. 84 * We always use 1ms granularity independent of hz. 85 */ 86 static __inline uint32_t 87 tcp_ts_getticks(void) 88 { 89 struct timeval tv; 90 91 /* 92 * getmicrouptime() should be good enough for any 1-1000ms granularity. 93 * Do not use getmicrotime() here as it might break nfsroot/tcp. 94 */ 95 getmicrouptime(&tv); 96 return (tv.tv_sec * 1000 + tv.tv_usec / 1000); 97 } 98 #endif /* _KERNEL */ 99 100 #endif /* _NETINET_TCP_SEQ_H_ */ 101