[apple/xnu.git] / bsd / netinet / tcp_seq.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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
 * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.5 2001/08/22 00:59:12 silby Exp $
 */

#ifndef _NETINET_TCP_SEQ_H_
#define _NETINET_TCP_SEQ_H_
#include <sys/appleapiopts.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))

/* for modulo comparisons of timestamps */
#define TSTMP_LT(a,b)	((int)((a)-(b)) < 0)
#define TSTMP_GEQ(a,b)	((int)((a)-(b)) >= 0)

/*
 * TCP connection counts are 32 bit integers operated
 * on with modular arithmetic.  These macros can be
 * used to compare such integers.
 */
#define	CC_LT(a,b)	((int)((a)-(b)) < 0)
#define	CC_LEQ(a,b)	((int)((a)-(b)) <= 0)
#define	CC_GT(a,b)	((int)((a)-(b)) > 0)
#define	CC_GEQ(a,b)	((int)((a)-(b)) >= 0)

/* Macro to increment a CC: skip 0 which has a special meaning */
#define CC_INC(c)	(++(c) == 0 ? ++(c) : (c))

#ifdef KERNEL_PRIVATE
/*
 * 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)->iss  

#define TCP_PAWS_IDLE	(24 * 24 * 60 * 60 * PR_SLOWHZ)
					/* timestamp wrap-around time */

extern tcp_cc	tcp_ccgen;		/* global connection count */
#endif KERNEL_PRIVATE
#endif /* _NETINET_TCP_SEQ_H_ */
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
6601e61a	4	* @APPLE_LICENSE_HEADER_START@
1c79356b	5	*
6601e61a A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
8f6c56a5	11	*
6601e61a A	12	* This Original Code and all software distributed under the License are
6601e61a A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
6601e61a A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
8f6c56a5	19	*
6601e61a	20	* @APPLE_LICENSE_HEADER_END@
1c79356b A	21	*/
	22	/*
	23	* Copyright (c) 1982, 1986, 1993, 1995
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*
	54	* @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
9bccf70c	55	* $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.5 2001/08/22 00:59:12 silby Exp $
1c79356b A	56	*/
	57
	58	#ifndef _NETINET_TCP_SEQ_H_
	59	#define _NETINET_TCP_SEQ_H_
9bccf70c	60	#include <sys/appleapiopts.h>
1c79356b A	61	/*
	62	* TCP sequence numbers are 32 bit integers operated
	63	* on with modular arithmetic. These macros can be
	64	* used to compare such integers.
	65	*/
	66	#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
	67	#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
	68	#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
	69	#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
	70
8ad349bb A	71	#define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b))
	72	#define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b))
	73
1c79356b A	74	/* for modulo comparisons of timestamps */
	75	#define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
	76	#define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
	77
	78	/*
	79	* TCP connection counts are 32 bit integers operated
	80	* on with modular arithmetic. These macros can be
	81	* used to compare such integers.
	82	*/
	83	#define CC_LT(a,b) ((int)((a)-(b)) < 0)
	84	#define CC_LEQ(a,b) ((int)((a)-(b)) <= 0)
	85	#define CC_GT(a,b) ((int)((a)-(b)) > 0)
	86	#define CC_GEQ(a,b) ((int)((a)-(b)) >= 0)
	87
	88	/* Macro to increment a CC: skip 0 which has a special meaning */
	89	#define CC_INC(c) (++(c) == 0 ? ++(c) : (c))
	90
91447636	91	#ifdef KERNEL_PRIVATE
1c79356b A	92	/*
	93	* Macros to initialize tcp sequence numbers for
	94	* send and receive from initial send and receive
	95	* sequence numbers.
	96	*/
	97	#define tcp_rcvseqinit(tp) \
	98	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
	99
	100	#define tcp_sendseqinit(tp) \
	101	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
91447636	102	(tp)->snd_recover = (tp)->snd_high = (tp)->iss
1c79356b A	103
	104	#define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * PR_SLOWHZ)
	105	/* timestamp wrap-around time */
	106
1c79356b	107	extern tcp_cc tcp_ccgen; /* global connection count */
91447636	108	#endif KERNEL_PRIVATE
1c79356b	109	#endif /* _NETINET_TCP_SEQ_H_ */