projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 43866e37 | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| 1c79356b | 7 | * |
| 43866e37 A |
8 | * This file contains Original Code and/or Modifications of Original Code |
| 9 | * as defined in and that are subject to the Apple Public Source License | |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 11 | * compliance with the License. Please obtain a copy of the License at | |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 13 | * file. | |
| 14 | * | |
| 15 | * The Original Code and all software distributed under the License are | |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 43866e37 A |
19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 20 | * Please see the License for the specific language governing rights and | |
| 21 | * limitations under the License. | |
| 1c79356b A |
22 | * |
| 23 | * @APPLE_LICENSE_HEADER_END@ | |
| 24 | */ | |
| 25 | ||
| 26 | /* | |
| 27 | * Copyright (c) 1988, 1989 Apple Computer, Inc. | |
| 28 | */ | |
| 29 | ||
| 30 | #ifndef _NETAT_AT_DDP_BRT_H_ | |
| 31 | #define _NETAT_AT_DDP_BRT_H_ | |
| 9bccf70c A |
32 | #include <sys/appleapiopts.h> |
| 33 | #ifdef __APPLE_API_PRIVATE | |
| 1c79356b A |
34 | |
| 35 | typedef struct { | |
| 36 | int age_flag; | |
| 37 | at_ifaddr_t *ifID; | |
| 38 | struct etalk_addr et_addr; | |
| 39 | at_net_al net; | |
| 40 | } ddp_brt_t; | |
| 41 | ||
| 42 | #define BRT_SWEEP_INT (10 * PR_SLOWHZ) | |
| 43 | #define BRT_BSIZ 4 /* bucket size */ | |
| 44 | #define BRT_NB 16 /* number of buckets */ | |
| 45 | #define BRTSIZE (BRT_BSIZ * BRT_NB) | |
| 46 | ||
| 47 | /* age_flag values */ | |
| 48 | #define BRT_EMPTY 0 /* the BRT entry is empty */ | |
| 49 | /* (or aged out). */ | |
| 50 | #define BRT_VALID 1 /* BRT entry contains valid */ | |
| 51 | /* tuple */ | |
| 52 | #define BRT_GETTING_OLD 2 /* BRT entry is a candidate */ | |
| 53 | /* for aging */ | |
| 54 | ||
| 55 | #define BRT_HASH(a) ((a) % BRT_NB) | |
| 56 | ||
| 57 | #define BRT_LOOK(brt, dst_net) { \ | |
| 58 | register n; \ | |
| 59 | brt = &at_ddp_brt[BRT_HASH(dst_net) * BRT_BSIZ]; \ | |
| 60 | for (n = 0 ; ; brt++) { \ | |
| 61 | if (brt->net == dst_net) \ | |
| 62 | break; \ | |
| 63 | if (++n >= BRT_BSIZ) { \ | |
| 64 | brt = NULL; \ | |
| 65 | break; \ | |
| 66 | } \ | |
| 67 | } \ | |
| 68 | } | |
| 69 | ||
| 70 | #define NEW_BRT(brt, net) { \ | |
| 71 | register n; \ | |
| 72 | brt = &at_ddp_brt[BRT_HASH(net) * BRT_BSIZ]; \ | |
| 73 | for (n = 0 ; ; brt++) { \ | |
| 74 | if (brt->age_flag == BRT_EMPTY) \ | |
| 75 | break; \ | |
| 76 | if (++n >= BRT_BSIZ) { \ | |
| 77 | brt = NULL; \ | |
| 78 | break; \ | |
| 79 | } \ | |
| 80 | } \ | |
| 81 | } | |
| 82 | ||
| 83 | /* Best Router Cache */ | |
| 84 | extern ddp_brt_t at_ddp_brt[BRTSIZE]; | |
| 85 | ||
| 9bccf70c | 86 | #endif /* __APPLE_API_PRIVATE */ |
| 1c79356b A |
87 | #endif /* _NETAT_AT_DDP_BRT_H_ */ |
| 88 |