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/* Authors: Karl MacMillan <kmacmillan@tresys.com>
* Frank Mayer <mayerf@tresys.com>
*
* Copyright (C) 2003 - 2004 Tresys Technology, LLC
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2.
*/
#ifndef _CONDITIONAL_H_
#define _CONDITIONAL_H_
#include "avtab.h"
#include "symtab.h"
#include "policydb.h"
#define COND_EXPR_MAXDEPTH 10
/*
* A conditional expression is a list of operators and operands
* in reverse polish notation.
*/
struct cond_expr {
#define COND_BOOL 1 /* plain bool */
#define COND_NOT 2 /* !bool */
#define COND_OR 3 /* bool || bool */
#define COND_AND 4 /* bool && bool */
#define COND_XOR 5 /* bool ^ bool */
#define COND_EQ 6 /* bool == bool */
#define COND_NEQ 7 /* bool != bool */
#define COND_LAST COND_NEQ
__u32 expr_type;
__u32 bool;
struct cond_expr *next;
};
/*
* Each cond_node contains a list of rules to be enabled/disabled
* depending on the current value of the conditional expression. This
* struct is for that list.
*/
struct cond_av_list {
struct avtab_node *node;
struct cond_av_list *next;
};
/*
* A cond node represents a conditional block in a policy. It
* contains a conditional expression, the current state of the expression,
* two lists of rules to enable/disable depending on the value of the
* expression (the true list corresponds to if and the false list corresponds
* to else)..
*/
struct cond_node {
int cur_state;
struct cond_expr *expr;
struct cond_av_list *true_list;
struct cond_av_list *false_list;
struct cond_node *next;
};
int cond_policydb_init(struct policydb *p);
void cond_policydb_destroy(struct policydb *p);
int cond_init_bool_indexes(struct policydb *p);
int cond_destroy_bool(void *key, void *datum, void *p);
int cond_index_bool(void *key, void *datum, void *datap);
int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp);
int cond_read_list(struct policydb *p, void *fp);
void cond_compute_av(struct avtab *ctab, struct avtab_key *key, struct av_decision *avd);
int evaluate_cond_node(struct policydb *p, struct cond_node *node);
#endif /* _CONDITIONAL_H_ */
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