/* * An access vector table (avtab) is a hash table * of access vectors and transition types indexed * by a type pair and a class. An access vector * table is used to represent the type enforcement * tables. * * Author : Stephen Smalley, <sds@epoch.ncsc.mil> */ /* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> * * Added conditional policy language extensions * * Copyright (C) 2003 Tresys Technology, LLC * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2. */ #ifndef _SS_AVTAB_H_ #define _SS_AVTAB_H_ struct avtab_key { u16 source_type; /* source type */ u16 target_type; /* target type */ u16 target_class; /* target object class */ #define AVTAB_ALLOWED 1 #define AVTAB_AUDITALLOW 2 #define AVTAB_AUDITDENY 4 #define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) #define AVTAB_TRANSITION 16 #define AVTAB_MEMBER 32 #define AVTAB_CHANGE 64 #define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) #define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ #define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ u16 specified; /* what field is specified */ }; struct avtab_datum { u32 data; /* access vector or type value */ }; struct avtab_node { struct avtab_key key; struct avtab_datum datum; struct avtab_node *next; }; struct avtab { struct avtab_node **htable; u32 nel; /* number of elements */ }; int avtab_init(struct avtab *); struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k); void avtab_destroy(struct avtab *h); void avtab_hash_eval(struct avtab *h, char *tag); int avtab_read_item(void *fp, uint32_t vers, struct avtab *a, int (*insert)(struct avtab *a, struct avtab_key *k, struct avtab_datum *d, void *p), void *p); int avtab_read(struct avtab *a, void *fp, u32 vers); struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datum *datum); struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key); struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified); void avtab_cache_init(void); void avtab_cache_destroy(void); #define AVTAB_HASH_BITS 15 #define AVTAB_HASH_BUCKETS (1 << AVTAB_HASH_BITS) #define AVTAB_HASH_MASK (AVTAB_HASH_BUCKETS-1) #define AVTAB_SIZE AVTAB_HASH_BUCKETS #endif /* _SS_AVTAB_H_ */