1*1179c5e7Sryo /* $NetBSD: tcp_seq.h,v 1.17 2014/07/25 17:53:59 ryo Exp $ */ 2cf92afd6Scgd 361f28255Scgd /* 4e5e283e0Sthorpej * Copyright (c) 1982, 1986, 1993, 1995 507b4f2abSmycroft * The Regents of the University of California. All rights reserved. 661f28255Scgd * 761f28255Scgd * Redistribution and use in source and binary forms, with or without 861f28255Scgd * modification, are permitted provided that the following conditions 961f28255Scgd * are met: 1061f28255Scgd * 1. Redistributions of source code must retain the above copyright 1161f28255Scgd * notice, this list of conditions and the following disclaimer. 1261f28255Scgd * 2. Redistributions in binary form must reproduce the above copyright 1361f28255Scgd * notice, this list of conditions and the following disclaimer in the 1461f28255Scgd * documentation and/or other materials provided with the distribution. 15aad01611Sagc * 3. Neither the name of the University nor the names of its contributors 1661f28255Scgd * may be used to endorse or promote products derived from this software 1761f28255Scgd * without specific prior written permission. 1861f28255Scgd * 1961f28255Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2061f28255Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2161f28255Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2261f28255Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2361f28255Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2461f28255Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2561f28255Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2661f28255Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2761f28255Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2861f28255Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2961f28255Scgd * SUCH DAMAGE. 3061f28255Scgd * 31e5e283e0Sthorpej * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95 3261f28255Scgd */ 3361f28255Scgd 34f73530baSperry #ifndef _NETINET_TCP_SEQ_H_ 35f73530baSperry #define _NETINET_TCP_SEQ_H_ 36f73530baSperry 3761f28255Scgd /* 3861f28255Scgd * TCP sequence numbers are 32 bit integers operated 3961f28255Scgd * on with modular arithmetic. These macros can be 4061f28255Scgd * used to compare such integers. 4161f28255Scgd */ 4261f28255Scgd #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 4361f28255Scgd #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 4461f28255Scgd #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 4561f28255Scgd #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 46f7707899Skurahone #define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b)) 47f7707899Skurahone #define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b)) 4861f28255Scgd 4925054b5cSmatt #define SEQ_SUB(a,b) ((long)((a)-(b))) 5025054b5cSmatt 5161f28255Scgd /* 5261f28255Scgd * Macros to initialize tcp sequence numbers for 5361f28255Scgd * send and receive from initial send and receive 5461f28255Scgd * sequence numbers. 5561f28255Scgd */ 5661f28255Scgd #define tcp_rcvseqinit(tp) \ 5761f28255Scgd (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 5861f28255Scgd 5961f28255Scgd #define tcp_sendseqinit(tp) \ 6061f28255Scgd (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 61*1179c5e7Sryo (tp)->snd_recover = (tp)->snd_high = (tp)->snd_fack = (tp)->iss 6280513cb5Sexplorer 63e2cb6dadSmycroft #define TCP_ISS_RANDOM_MASK 0x00ffffff /* bits of randomness in a TCP ISS */ 64e2cb6dadSmycroft #define TCP_ISSINCR 0x01000000 /* increment per time and per conn */ 6580513cb5Sexplorer 6680513cb5Sexplorer #ifdef _KERNEL 6780513cb5Sexplorer extern tcp_seq tcp_iss_seq; /* tcp initial seq # */ 6880513cb5Sexplorer #endif 69f73530baSperry 709702e987Selad #endif /* !_NETINET_TCP_SEQ_H_ */ 71