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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Authors: Karl MacMillan <kmacmillan@tresys.com>
2 * Frank Mayer <mayerf@tresys.com>
3 *
4 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2.
8 */
9
10#ifndef _CONDITIONAL_H_
11#define _CONDITIONAL_H_
12
13#include "avtab.h"
14#include "symtab.h"
15#include "policydb.h"
16
17#define COND_EXPR_MAXDEPTH 10
18
19/*
20 * A conditional expression is a list of operators and operands
21 * in reverse polish notation.
22 */
23struct cond_expr {
24#define COND_BOOL 1 /* plain bool */
25#define COND_NOT 2 /* !bool */
26#define COND_OR 3 /* bool || bool */
27#define COND_AND 4 /* bool && bool */
28#define COND_XOR 5 /* bool ^ bool */
29#define COND_EQ 6 /* bool == bool */
30#define COND_NEQ 7 /* bool != bool */
Vesa-Matti Kari421fae02008-08-06 18:24:51 +030031#define COND_LAST COND_NEQ
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 __u32 expr_type;
33 __u32 bool;
34 struct cond_expr *next;
35};
36
37/*
38 * Each cond_node contains a list of rules to be enabled/disabled
39 * depending on the current value of the conditional expression. This
40 * struct is for that list.
41 */
42struct cond_av_list {
43 struct avtab_node *node;
44 struct cond_av_list *next;
45};
46
47/*
48 * A cond node represents a conditional block in a policy. It
49 * contains a conditional expression, the current state of the expression,
50 * two lists of rules to enable/disable depending on the value of the
51 * expression (the true list corresponds to if and the false list corresponds
52 * to else)..
53 */
54struct cond_node {
55 int cur_state;
56 struct cond_expr *expr;
57 struct cond_av_list *true_list;
58 struct cond_av_list *false_list;
59 struct cond_node *next;
60};
61
Eric Parisccb3cbe2008-04-22 17:46:12 -040062int cond_policydb_init(struct policydb *p);
63void cond_policydb_destroy(struct policydb *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Eric Parisccb3cbe2008-04-22 17:46:12 -040065int cond_init_bool_indexes(struct policydb *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066int cond_destroy_bool(void *key, void *datum, void *p);
67
68int cond_index_bool(void *key, void *datum, void *datap);
69
70int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp);
71int cond_read_list(struct policydb *p, void *fp);
72
73void cond_compute_av(struct avtab *ctab, struct avtab_key *key, struct av_decision *avd);
74
75int evaluate_cond_node(struct policydb *p, struct cond_node *node);
76
77#endif /* _CONDITIONAL_H_ */