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 #ifndef _SS_AVTAB_H_ 21 #define _SS_AVTAB_H_ 22 23 struct avtab_key { 24 u16 source_type; /* source type */ 25 u16 target_type; /* target type */ 26 u16 target_class; /* target object class */ 27 #define AVTAB_ALLOWED 1 28 #define AVTAB_AUDITALLOW 2 29 #define AVTAB_AUDITDENY 4 30 #define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) 31 #define AVTAB_TRANSITION 16 32 #define AVTAB_MEMBER 32 33 #define AVTAB_CHANGE 64 34 #define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) 35 #define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ 36 #define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ 37 u16 specified; /* what field is specified */ 38 }; 39 40 struct avtab_datum { 41 u32 data; /* access vector or type value */ 42 }; 43 44 struct avtab_node { 45 struct avtab_key key; 46 struct avtab_datum datum; 47 struct avtab_node *next; 48 }; 49 50 struct avtab { 51 struct avtab_node **htable; 52 u32 nel; /* number of elements */ 53 }; 54 55 int avtab_init(struct avtab *); 56 struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k); 57 void avtab_destroy(struct avtab *h); 58 void avtab_hash_eval(struct avtab *h, char *tag); 59 60 int avtab_read_item(void *fp, uint32_t vers, struct avtab *a, 61 int (*insert)(struct avtab *a, struct avtab_key *k, 62 struct avtab_datum *d, void *p), 63 void *p); 64 65 int avtab_read(struct avtab *a, void *fp, u32 vers); 66 67 struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, 68 struct avtab_datum *datum); 69 70 struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key); 71 72 struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified); 73 74 void avtab_cache_init(void); 75 void avtab_cache_destroy(void); 76 77 #define AVTAB_HASH_BITS 15 78 #define AVTAB_HASH_BUCKETS (1 << AVTAB_HASH_BITS) 79 #define AVTAB_HASH_MASK (AVTAB_HASH_BUCKETS-1) 80 81 #define AVTAB_SIZE AVTAB_HASH_BUCKETS 82 83 #endif /* _SS_AVTAB_H_ */ 84 85