[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)

/* 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 __APPLE_API_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)->iss

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

#ifdef KERNEL
#ifdef __APPLE_API_PRIVATE
extern tcp_cc	tcp_ccgen;		/* global connection count */
#endif /* __APPLE_API_PRIVATE */
#endif /* KERNEL */
#endif /* _NETINET_TCP_SEQ_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 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.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 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.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	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
	71	/* for modulo comparisons of timestamps */
	72	#define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
	73	#define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
	74
	75	/*
	76	* TCP connection counts are 32 bit integers operated
	77	* on with modular arithmetic. These macros can be
	78	* used to compare such integers.
	79	*/
	80	#define CC_LT(a,b) ((int)((a)-(b)) < 0)
	81	#define CC_LEQ(a,b) ((int)((a)-(b)) <= 0)
	82	#define CC_GT(a,b) ((int)((a)-(b)) > 0)
	83	#define CC_GEQ(a,b) ((int)((a)-(b)) >= 0)
	84
	85	/* Macro to increment a CC: skip 0 which has a special meaning */
	86	#define CC_INC(c) (++(c) == 0 ? ++(c) : (c))
	87
9bccf70c	88	#ifdef __APPLE_API_PRIVATE
1c79356b A	89	/*
	90	* Macros to initialize tcp sequence numbers for
	91	* send and receive from initial send and receive
	92	* sequence numbers.
	93	*/
	94	#define tcp_rcvseqinit(tp) \
	95	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
	96
	97	#define tcp_sendseqinit(tp) \
	98	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
	99	(tp)->iss
	100
	101	#define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * PR_SLOWHZ)
	102	/* timestamp wrap-around time */
9bccf70c	103	#endif /* __APPLE_API_PRIVATE */
1c79356b A	104
1c79356b A	105	#ifdef KERNEL
9bccf70c	106	#ifdef __APPLE_API_PRIVATE
1c79356b	107	extern tcp_cc tcp_ccgen; /* global connection count */
9bccf70c	108	#endif /* __APPLE_API_PRIVATE */
1c79356b A	109	#endif /* KERNEL */
1c79356b A	110	#endif /* _NETINET_TCP_SEQ_H_ */