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 | * | |
| e5568f75 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 | * |
| e5568f75 A |
12 | * This Original Code and all software distributed under the License are |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
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14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
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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_ | |
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29 | #include <sys/appleapiopts.h> |
| 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_ */ |
| 85 |