Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * An access vector table (avtab) is a hash table | |
3 | * of access vectors and transition types indexed | |
4 | * by a type pair and a class. An access vector | |
5 | * table is used to represent the type enforcement | |
6 | * tables. | |
7 | * | |
8 | * Author : Stephen Smalley, <sds@epoch.ncsc.mil> | |
9 | */ | |
10 | ||
11 | /* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
12 | * | |
13 | * Added conditional policy language extensions | |
14 | * | |
15 | * Copyright (C) 2003 Tresys Technology, LLC | |
16 | * This program is free software; you can redistribute it and/or modify | |
652bb9b0 | 17 | * it under the terms of the GNU General Public License as published by |
1da177e4 | 18 | * the Free Software Foundation, version 2. |
3232c110 YN |
19 | * |
20 | * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp> | |
21 | * Tuned number of hash slots for avtab to reduce memory usage | |
1da177e4 LT |
22 | */ |
23 | #ifndef _SS_AVTAB_H_ | |
24 | #define _SS_AVTAB_H_ | |
25 | ||
fa1aa143 | 26 | #include "security.h" |
ba39db6e SS |
27 | #include <linux/flex_array.h> |
28 | ||
1da177e4 | 29 | struct avtab_key { |
782ebb99 SS |
30 | u16 source_type; /* source type */ |
31 | u16 target_type; /* target type */ | |
32 | u16 target_class; /* target object class */ | |
652bb9b0 EP |
33 | #define AVTAB_ALLOWED 0x0001 |
34 | #define AVTAB_AUDITALLOW 0x0002 | |
35 | #define AVTAB_AUDITDENY 0x0004 | |
36 | #define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) | |
37 | #define AVTAB_TRANSITION 0x0010 | |
38 | #define AVTAB_MEMBER 0x0020 | |
39 | #define AVTAB_CHANGE 0x0040 | |
40 | #define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) | |
fa1aa143 JVS |
41 | /* extended permissions */ |
42 | #define AVTAB_XPERMS_ALLOWED 0x0100 | |
43 | #define AVTAB_XPERMS_AUDITALLOW 0x0200 | |
44 | #define AVTAB_XPERMS_DONTAUDIT 0x0400 | |
45 | #define AVTAB_XPERMS (AVTAB_XPERMS_ALLOWED | \ | |
46 | AVTAB_XPERMS_AUDITALLOW | \ | |
47 | AVTAB_XPERMS_DONTAUDIT) | |
652bb9b0 EP |
48 | #define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ |
49 | #define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ | |
782ebb99 SS |
50 | u16 specified; /* what field is specified */ |
51 | }; | |
52 | ||
fa1aa143 JVS |
53 | /* |
54 | * For operations that require more than the 32 permissions provided by the avc | |
55 | * extended permissions may be used to provide 256 bits of permissions. | |
56 | */ | |
57 | struct avtab_extended_perms { | |
58 | /* These are not flags. All 256 values may be used */ | |
59 | #define AVTAB_XPERMS_IOCTLFUNCTION 0x01 | |
60 | #define AVTAB_XPERMS_IOCTLDRIVER 0x02 | |
61 | /* extension of the avtab_key specified */ | |
62 | u8 specified; /* ioctl, netfilter, ... */ | |
63 | /* | |
64 | * if 256 bits is not adequate as is often the case with ioctls, then | |
65 | * multiple extended perms may be used and the driver field | |
66 | * specifies which permissions are included. | |
67 | */ | |
68 | u8 driver; | |
69 | /* 256 bits of permissions */ | |
70 | struct extended_perms_data perms; | |
71 | }; | |
72 | ||
782ebb99 | 73 | struct avtab_datum { |
fa1aa143 JVS |
74 | union { |
75 | u32 data; /* access vector or type value */ | |
76 | struct avtab_extended_perms *xperms; | |
77 | } u; | |
1da177e4 LT |
78 | }; |
79 | ||
80 | struct avtab_node { | |
81 | struct avtab_key key; | |
82 | struct avtab_datum datum; | |
83 | struct avtab_node *next; | |
84 | }; | |
85 | ||
86 | struct avtab { | |
ba39db6e | 87 | struct flex_array *htable; |
1da177e4 | 88 | u32 nel; /* number of elements */ |
3232c110 | 89 | u32 nslot; /* number of hash slots */ |
33ebc193 | 90 | u32 mask; /* mask to compute hash func */ |
3232c110 | 91 | |
1da177e4 LT |
92 | }; |
93 | ||
94 | int avtab_init(struct avtab *); | |
3232c110 | 95 | int avtab_alloc(struct avtab *, u32); |
782ebb99 | 96 | struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k); |
1da177e4 LT |
97 | void avtab_destroy(struct avtab *h); |
98 | void avtab_hash_eval(struct avtab *h, char *tag); | |
99 | ||
45e5421e SS |
100 | struct policydb; |
101 | int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol, | |
782ebb99 SS |
102 | int (*insert)(struct avtab *a, struct avtab_key *k, |
103 | struct avtab_datum *d, void *p), | |
104 | void *p); | |
105 | ||
45e5421e | 106 | int avtab_read(struct avtab *a, void *fp, struct policydb *pol); |
cee74f47 EP |
107 | int avtab_write_item(struct policydb *p, struct avtab_node *cur, void *fp); |
108 | int avtab_write(struct policydb *p, struct avtab *a, void *fp); | |
1da177e4 LT |
109 | |
110 | struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, | |
111 | struct avtab_datum *datum); | |
112 | ||
782ebb99 | 113 | struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key); |
1da177e4 LT |
114 | |
115 | struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified); | |
116 | ||
117 | void avtab_cache_init(void); | |
118 | void avtab_cache_destroy(void); | |
119 | ||
cf7b6c02 | 120 | #define MAX_AVTAB_HASH_BITS 16 |
3232c110 | 121 | #define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS) |
1da177e4 LT |
122 | |
123 | #endif /* _SS_AVTAB_H_ */ | |
124 |