/* $NetBSD: tcp_seq.h,v 1.17 2014/07/25 17:53:59 ryo Exp $ */ /* * Copyright (c) 1982, 1986, 1993, 1995 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95 */ #ifndef _NETINET_TCP_SEQ_H_ #define _NETINET_TCP_SEQ_H_ /* * TCP sequence numbers are 32 bit integers operated * on with modular arithmetic. These macros can be * used to compare such integers. */ #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) #define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b)) #define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b)) #define SEQ_SUB(a,b) ((long)((a)-(b))) /* * Macros to initialize tcp sequence numbers for * send and receive from initial send and receive * sequence numbers. */ #define tcp_rcvseqinit(tp) \ (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 #define tcp_sendseqinit(tp) \ (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ (tp)->snd_recover = (tp)->snd_high = (tp)->snd_fack = (tp)->iss #define TCP_ISS_RANDOM_MASK 0x00ffffff /* bits of randomness in a TCP ISS */ #define TCP_ISSINCR 0x01000000 /* increment per time and per conn */ #ifdef _KERNEL extern tcp_seq tcp_iss_seq; /* tcp initial seq # */ #endif #endif /* !_NETINET_TCP_SEQ_H_ */ |