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 17 * it under the terms of the GNU General Public License as published by 18 * the Free Software Foundation, version 2. 19 * 20 * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp> 21 * Tuned number of hash slots for avtab to reduce memory usage 22 */ 23 #ifndef _SS_AVTAB_H_ 24 #define _SS_AVTAB_H_ 25 26 #include <linux/flex_array.h> 27 28 struct avtab_key { 29 u16 source_type; /* source type */ 30 u16 target_type; /* target type */ 31 u16 target_class; /* target object class */ 32 #define AVTAB_ALLOWED 0x0001 33 #define AVTAB_AUDITALLOW 0x0002 34 #define AVTAB_AUDITDENY 0x0004 35 #define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) 36 #define AVTAB_TRANSITION 0x0010 37 #define AVTAB_MEMBER 0x0020 38 #define AVTAB_CHANGE 0x0040 39 #define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) 40 #define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ 41 #define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ 42 u16 specified; /* what field is specified */ 43 }; 44 45 struct avtab_datum { 46 u32 data; /* access vector or type value */ 47 }; 48 49 struct avtab_node { 50 struct avtab_key key; 51 struct avtab_datum datum; 52 struct avtab_node *next; 53 }; 54 55 struct avtab { 56 struct flex_array *htable; 57 u32 nel; /* number of elements */ 58 u32 nslot; /* number of hash slots */ 59 u32 mask; /* mask to compute hash func */ 60 61 }; 62 63 int avtab_init(struct avtab *); 64 int avtab_alloc(struct avtab *, u32); 65 struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k); 66 void avtab_destroy(struct avtab *h); 67 void avtab_hash_eval(struct avtab *h, char *tag); 68 69 struct policydb; 70 int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol, 71 int (*insert)(struct avtab *a, struct avtab_key *k, 72 struct avtab_datum *d, void *p), 73 void *p); 74 75 int avtab_read(struct avtab *a, void *fp, struct policydb *pol); 76 int avtab_write_item(struct policydb *p, struct avtab_node *cur, void *fp); 77 int avtab_write(struct policydb *p, struct avtab *a, void *fp); 78 79 struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, 80 struct avtab_datum *datum); 81 82 struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key); 83 84 struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified); 85 86 void avtab_cache_init(void); 87 void avtab_cache_destroy(void); 88 89 #define MAX_AVTAB_HASH_BITS 16 90 #define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS) 91 92 #endif /* _SS_AVTAB_H_ */ 93 94