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
23struct 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
40struct avtab_datum {
41	u32 data; /* access vector or type value */
42};
43
44struct avtab_node {
45	struct avtab_key key;
46	struct avtab_datum datum;
47	struct avtab_node *next;
48};
49
50struct avtab {
51	struct avtab_node **htable;
52	u32 nel;	/* number of elements */
53};
54
55int avtab_init(struct avtab *);
56struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k);
57void avtab_destroy(struct avtab *h);
58void avtab_hash_eval(struct avtab *h, char *tag);
59
60int 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
65int avtab_read(struct avtab *a, void *fp, u32 vers);
66
67struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key,
68					  struct avtab_datum *datum);
69
70struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key);
71
72struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified);
73
74void avtab_cache_init(void);
75void 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