LCOM1920-T02G10

/*        $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_ */