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 u32 source_type; /* source type */ 25 u32 target_type; /* target type */ 26 u32 target_class; /* target object class */ 27 }; 28 29 struct avtab_datum { 30 #define AVTAB_ALLOWED 1 31 #define AVTAB_AUDITALLOW 2 32 #define AVTAB_AUDITDENY 4 33 #define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) 34 #define AVTAB_TRANSITION 16 35 #define AVTAB_MEMBER 32 36 #define AVTAB_CHANGE 64 37 #define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) 38 #define AVTAB_ENABLED 0x80000000 /* reserved for used in cond_avtab */ 39 u32 specified; /* what fields are specified */ 40 u32 data[3]; /* access vectors or types */ 41 #define avtab_allowed(x) (x)->data[0] 42 #define avtab_auditdeny(x) (x)->data[1] 43 #define avtab_auditallow(x) (x)->data[2] 44 #define avtab_transition(x) (x)->data[0] 45 #define avtab_change(x) (x)->data[1] 46 #define avtab_member(x) (x)->data[2] 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 avtab_node **htable; 57 u32 nel; /* number of elements */ 58 }; 59 60 int avtab_init(struct avtab *); 61 struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k, int specified); 62 void avtab_destroy(struct avtab *h); 63 void avtab_hash_eval(struct avtab *h, char *tag); 64 65 int avtab_read_item(void *fp, struct avtab_datum *avdatum, struct avtab_key *avkey); 66 int avtab_read(struct avtab *a, void *fp, u32 config); 67 68 struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, 69 struct avtab_datum *datum); 70 71 struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key, int specified); 72 73 struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified); 74 75 void avtab_cache_init(void); 76 void avtab_cache_destroy(void); 77 78 #define AVTAB_HASH_BITS 15 79 #define AVTAB_HASH_BUCKETS (1 << AVTAB_HASH_BITS) 80 #define AVTAB_HASH_MASK (AVTAB_HASH_BUCKETS-1) 81 82 #define AVTAB_SIZE AVTAB_HASH_BUCKETS 83 84 #endif /* _SS_AVTAB_H_ */ 85 86