tcp_seq.h revision 1817
1/* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tcp_seq.h 8.1 (Berkeley) 6/10/93 34 * $Id$ 35 */ 36 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/* 48 * Macros to initialize tcp sequence numbers for 49 * send and receive from initial send and receive 50 * sequence numbers. 51 */ 52#define tcp_rcvseqinit(tp) \ 53 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 54 55#define tcp_sendseqinit(tp) \ 56 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 57 (tp)->iss 58 59#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 60 61#ifdef KERNEL 62tcp_seq tcp_iss; /* tcp initial send seq # */ 63#endif 64