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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       8

        __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_ */