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/*
* 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 {
u32 source_type; /* source type */
u32 target_type; /* target type */
u32 target_class; /* target object class */
};
struct avtab_datum {
#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 0x80000000 /* reserved for used in cond_avtab */
u32 specified; /* what fields are specified */
u32 data[3]; /* access vectors or types */
#define avtab_allowed(x) (x)->data[0]
#define avtab_auditdeny(x) (x)->data[1]
#define avtab_auditallow(x) (x)->data[2]
#define avtab_transition(x) (x)->data[0]
#define avtab_change(x) (x)->data[1]
#define avtab_member(x) (x)->data[2]
};
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, int specified);
void avtab_destroy(struct avtab *h);
void avtab_hash_eval(struct avtab *h, char *tag);
int avtab_read_item(void *fp, struct avtab_datum *avdatum, struct avtab_key *avkey);
int avtab_read(struct avtab *a, void *fp, u32 config);
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, int specified);
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_ */
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