1 /* 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 */
23 struct 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 */
31 #define COND_LAST COND_NEQ
32 __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 */
42 struct 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 */
54 struct 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
62 int cond_policydb_init(struct policydb *p);
63 void cond_policydb_destroy(struct policydb *p);
64
65 int cond_init_bool_indexes(struct policydb *p);
66 int cond_destroy_bool(void *key, void *datum, void *p);
67
68 int cond_index_bool(void *key, void *datum, void *datap);
69
70 int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp);
71 int cond_read_list(struct policydb *p, void *fp);
72
73 void cond_compute_av(struct avtab *ctab, struct avtab_key *key, struct av_decision *avd);
74
75 int evaluate_cond_node(struct policydb *p, struct cond_node *node);
76
77 #endif /* _CONDITIONAL_H_ */
78
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