1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Authors: Karl MacMillan <kmacmillan@tresys.com>
3 * Frank Mayer <mayerf@tresys.com>
5 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
8 #ifndef _CONDITIONAL_H_
9 #define _CONDITIONAL_H_
14 #include "../include/conditional.h"
16 #define COND_EXPR_MAXDEPTH 10
19 * A conditional expression is a list of operators and operands
20 * in reverse polish notation.
23 #define COND_BOOL 1 /* plain bool */
24 #define COND_NOT 2 /* !bool */
25 #define COND_OR 3 /* bool || bool */
26 #define COND_AND 4 /* bool && bool */
27 #define COND_XOR 5 /* bool ^ bool */
28 #define COND_EQ 6 /* bool == bool */
29 #define COND_NEQ 7 /* bool != bool */
30 #define COND_LAST COND_NEQ
33 struct cond_expr *next;
37 * Each cond_node contains a list of rules to be enabled/disabled
38 * depending on the current value of the conditional expression. This
39 * struct is for that list.
42 struct avtab_node *node;
43 struct cond_av_list *next;
47 * A cond node represents a conditional block in a policy. It
48 * contains a conditional expression, the current state of the expression,
49 * two lists of rules to enable/disable depending on the value of the
50 * expression (the true list corresponds to if and the false list corresponds
55 struct cond_expr *expr;
56 struct cond_av_list *true_list;
57 struct cond_av_list *false_list;
58 struct cond_node *next;
61 int cond_policydb_init(struct policydb *p);
62 void cond_policydb_destroy(struct policydb *p);
64 int cond_init_bool_indexes(struct policydb *p);
65 int cond_destroy_bool(void *key, void *datum, void *p);
67 int cond_index_bool(void *key, void *datum, void *datap);
69 int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp);
70 int cond_read_list(struct policydb *p, void *fp);
71 int cond_write_bool(void *key, void *datum, void *ptr);
72 int cond_write_list(struct policydb *p, struct cond_node *list, void *fp);
74 void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
75 struct av_decision *avd, struct extended_perms *xperms);
76 void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
77 struct extended_perms_decision *xpermd);
78 int evaluate_cond_node(struct policydb *p, struct cond_node *node);
80 #endif /* _CONDITIONAL_H_ */