tcp_seq.h revision 2169
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1982, 1986, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 331541Srgrimes * @(#)tcp_seq.h 8.1 (Berkeley) 6/10/93 342169Spaul * $Id: tcp_seq.h,v 1.2 1994/08/02 07:49:06 davidg Exp $ 351541Srgrimes */ 361541Srgrimes 372169Spaul#ifndef _NETINET_TCP_SEQ_H_ 382169Spaul#define _NETINET_TCP_SEQ_H_ 391541Srgrimes/* 401541Srgrimes * TCP sequence numbers are 32 bit integers operated 411541Srgrimes * on with modular arithmetic. These macros can be 421541Srgrimes * used to compare such integers. 431541Srgrimes */ 441541Srgrimes#define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 451541Srgrimes#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 461541Srgrimes#define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 471541Srgrimes#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 481541Srgrimes 491541Srgrimes/* 501541Srgrimes * Macros to initialize tcp sequence numbers for 511541Srgrimes * send and receive from initial send and receive 521541Srgrimes * sequence numbers. 531541Srgrimes */ 541541Srgrimes#define tcp_rcvseqinit(tp) \ 551541Srgrimes (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 561541Srgrimes 571541Srgrimes#define tcp_sendseqinit(tp) \ 581541Srgrimes (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 591541Srgrimes (tp)->iss 601541Srgrimes 611541Srgrimes#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 621541Srgrimes 631541Srgrimes#ifdef KERNEL 641541Srgrimestcp_seq tcp_iss; /* tcp initial send seq # */ 651541Srgrimes#endif 662169Spaul#endif 67