[apple/xnu.git] / bsd / netat / at_ddp_brt.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) 1988, 1989 Apple Computer, Inc. 
 */

#ifndef _NETAT_AT_DDP_BRT_H_
#define _NETAT_AT_DDP_BRT_H_
#include <sys/appleapiopts.h>
#ifdef __APPLE_API_PRIVATE

typedef struct {
	int 				age_flag;
	at_ifaddr_t			*ifID;
	struct	etalk_addr		et_addr;
	at_net_al			net;
} ddp_brt_t;

#define BRT_SWEEP_INT		(10 * PR_SLOWHZ)
#define	BRT_BSIZ		 4	/* bucket size */
#define	BRT_NB			16	/* number of buckets */
#define	BRTSIZE			(BRT_BSIZ * BRT_NB)

/* age_flag values */
#define	BRT_EMPTY		0	/* the BRT entry is empty     */
					/* (or aged out).             */
#define	BRT_VALID		1	/* BRT entry contains valid   */
					/* tuple 		      */
#define	BRT_GETTING_OLD		2	/* BRT entry is a candidate   */
					/* for aging		      */

#define	BRT_HASH(a)   ((a) % BRT_NB)

#define	BRT_LOOK(brt, dst_net) {				\
	register n; 						\
	brt = &at_ddp_brt[BRT_HASH(dst_net) * BRT_BSIZ];	\
	for (n = 0 ; ; brt++) {		                        \
		if (brt->net == dst_net) 			\
			break; 					\
		if (++n >= BRT_BSIZ) {                          \
		        brt = NULL;                             \
			break;                                  \
		}                                               \
	}                                                       \
	}

#define	NEW_BRT(brt, net) {					\
	register n; 						\
	brt = &at_ddp_brt[BRT_HASH(net) * BRT_BSIZ]; 		\
	for (n = 0 ; ; brt++) { 		                \
		if (brt->age_flag == BRT_EMPTY)			\
			break; 					\
		if (++n >= BRT_BSIZ) {				\
		        brt = NULL;				\
			break;                                  \
		}                                               \
        }                                                       \
	}

/* Best Router Cache */
extern	ddp_brt_t	at_ddp_brt[BRTSIZE];

#endif /* __APPLE_API_PRIVATE */
#endif /* _NETAT_AT_DDP_BRT_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	/*
	24	* Copyright (c) 1988, 1989 Apple Computer, Inc.
	25	*/
	26
	27	#ifndef _NETAT_AT_DDP_BRT_H_
	28	#define _NETAT_AT_DDP_BRT_H_
9bccf70c A	29	#include <sys/appleapiopts.h>
9bccf70c A	30	#ifdef __APPLE_API_PRIVATE
1c79356b A	31
	32	typedef struct {
	33	int age_flag;
	34	at_ifaddr_t *ifID;
	35	struct etalk_addr et_addr;
	36	at_net_al net;
	37	} ddp_brt_t;
	38
	39	#define BRT_SWEEP_INT (10 * PR_SLOWHZ)
	40	#define BRT_BSIZ 4 /* bucket size */
	41	#define BRT_NB 16 /* number of buckets */
	42	#define BRTSIZE (BRT_BSIZ * BRT_NB)
	43
	44	/* age_flag values */
	45	#define BRT_EMPTY 0 /* the BRT entry is empty */
	46	/* (or aged out). */
	47	#define BRT_VALID 1 /* BRT entry contains valid */
	48	/* tuple */
	49	#define BRT_GETTING_OLD 2 /* BRT entry is a candidate */
	50	/* for aging */
	51
	52	#define BRT_HASH(a) ((a) % BRT_NB)
	53
	54	#define BRT_LOOK(brt, dst_net) { \
	55	register n; \
	56	brt = &at_ddp_brt[BRT_HASH(dst_net) * BRT_BSIZ]; \
	57	for (n = 0 ; ; brt++) { \
	58	if (brt->net == dst_net) \
	59	break; \
	60	if (++n >= BRT_BSIZ) { \
	61	brt = NULL; \
	62	break; \
	63	} \
	64	} \
	65	}
	66
	67	#define NEW_BRT(brt, net) { \
	68	register n; \
	69	brt = &at_ddp_brt[BRT_HASH(net) * BRT_BSIZ]; \
	70	for (n = 0 ; ; brt++) { \
	71	if (brt->age_flag == BRT_EMPTY) \
	72	break; \
	73	if (++n >= BRT_BSIZ) { \
	74	brt = NULL; \
	75	break; \
	76	} \
	77	} \
	78	}
	79
	80	/* Best Router Cache */
	81	extern ddp_brt_t at_ddp_brt[BRTSIZE];
	82
9bccf70c	83	#endif /* __APPLE_API_PRIVATE */
1c79356b A	84	#endif /* _NETAT_AT_DDP_BRT_H_ */
1c79356b A	85