tcp_seq.h revision 1541
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 341541Srgrimes */ 351541Srgrimes 361541Srgrimes/* 371541Srgrimes * TCP sequence numbers are 32 bit integers operated 381541Srgrimes * on with modular arithmetic. These macros can be 391541Srgrimes * used to compare such integers. 401541Srgrimes */ 411541Srgrimes#define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 421541Srgrimes#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 431541Srgrimes#define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 441541Srgrimes#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 451541Srgrimes 461541Srgrimes/* 471541Srgrimes * Macros to initialize tcp sequence numbers for 481541Srgrimes * send and receive from initial send and receive 491541Srgrimes * sequence numbers. 501541Srgrimes */ 511541Srgrimes#define tcp_rcvseqinit(tp) \ 521541Srgrimes (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 531541Srgrimes 541541Srgrimes#define tcp_sendseqinit(tp) \ 551541Srgrimes (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 561541Srgrimes (tp)->iss 571541Srgrimes 581541Srgrimes#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 591541Srgrimes 601541Srgrimes#ifdef KERNEL 611541Srgrimestcp_seq tcp_iss; /* tcp initial send seq # */ 621541Srgrimes#endif 63