1/* SPDX-License-Identifier: GPL-2.0-only */
2/* Authors: Karl MacMillan <kmacmillan@tresys.com>
3 * Frank Mayer <mayerf@tresys.com>
4 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
5 */
6
7#ifndef _CONDITIONAL_H_
8#define _CONDITIONAL_H_
9
10#include "avtab.h"
11#include "symtab.h"
12#include "policydb.h"
13#include "../include/conditional.h"
14
15#define COND_EXPR_MAXDEPTH 10
16
17/*
18 * A conditional expression is a list of operators and operands
19 * in reverse polish notation.
20 */
21struct cond_expr_node {
22#define COND_BOOL 1 /* plain bool */
23#define COND_NOT 2 /* !bool */
24#define COND_OR 3 /* bool || bool */
25#define COND_AND 4 /* bool && bool */
26#define COND_XOR 5 /* bool ^ bool */
27#define COND_EQ 6 /* bool == bool */
28#define COND_NEQ 7 /* bool != bool */
29#define COND_LAST COND_NEQ
30 u32 expr_type;
31 u32 boolean;
32};
33
34struct cond_expr {
35 struct cond_expr_node *nodes;
36 u32 len;
37};
38
39/*
40 * Each cond_node contains a list of rules to be enabled/disabled
41 * depending on the current value of the conditional expression. This
42 * struct is for that list.
43 */
44struct cond_av_list {
45 struct avtab_node **nodes;
46 u32 len;
47};
48
49/*
50 * A cond node represents a conditional block in a policy. It
51 * contains a conditional expression, the current state of the expression,
52 * two lists of rules to enable/disable depending on the value of the
53 * expression (the true list corresponds to if and the false list corresponds
54 * to else)..
55 */
56struct cond_node {
57 int cur_state;
58 struct cond_expr expr;
59 struct cond_av_list true_list;
60 struct cond_av_list false_list;
61};
62
63void cond_policydb_init(struct policydb *p);
64void cond_policydb_destroy(struct policydb *p);
65
66int cond_init_bool_indexes(struct policydb *p);
67int cond_destroy_bool(void *key, void *datum, void *p);
68
69int cond_index_bool(void *key, void *datum, void *datap);
70
71int cond_read_bool(struct policydb *p, struct symtab *s, struct policy_file *fp);
72int cond_read_list(struct policydb *p, struct policy_file *fp);
73int cond_write_bool(void *key, void *datum, void *ptr);
74int cond_write_list(struct policydb *p, struct policy_file *fp);
75
76void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
77 struct av_decision *avd, struct extended_perms *xperms);
78void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
79 struct extended_perms_decision *xpermd);
80void evaluate_cond_nodes(struct policydb *p);
81void cond_policydb_destroy_dup(struct policydb *p);
82int cond_policydb_dup(struct policydb *new, const struct policydb *orig);
83
84#endif /* _CONDITIONAL_H_ */
85