/* 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_ */