LXR linux/security/selinux/ss/conditional.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/* Authors: Karl MacMillan <kmacmillan@tresys.com>
   3 *          Frank Mayer <mayerf@tresys.com>
   4 *
   5 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
   6 */
   7
   8#ifndef _CONDITIONAL_H_
   9#define _CONDITIONAL_H_
  10
  11#include "avtab.h"
  12#include "symtab.h"
  13#include "policydb.h"
  14#include "../include/conditional.h"
  15
  16#define COND_EXPR_MAXDEPTH 10
  17
  18/*
  19 * A conditional expression is a list of operators and operands
  20 * in reverse polish notation.
  21 */
  22struct cond_expr {
  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
  31        __u32 expr_type;
  32        __u32 bool;
  33        struct cond_expr *next;
  34};
  35
  36/*
  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.
  40 */
  41struct cond_av_list {
  42        struct avtab_node *node;
  43        struct cond_av_list *next;
  44};
  45
  46/*
  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
  51 * to else)..
  52 */
  53struct cond_node {
  54        int cur_state;
  55        struct cond_expr *expr;
  56        struct cond_av_list *true_list;
  57        struct cond_av_list *false_list;
  58        struct cond_node *next;
  59};
  60
  61int cond_policydb_init(struct policydb *p);
  62void cond_policydb_destroy(struct policydb *p);
  63
  64int cond_init_bool_indexes(struct policydb *p);
  65int cond_destroy_bool(void *key, void *datum, void *p);
  66
  67int cond_index_bool(void *key, void *datum, void *datap);
  68
  69int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp);
  70int cond_read_list(struct policydb *p, void *fp);
  71int cond_write_bool(void *key, void *datum, void *ptr);
  72int cond_write_list(struct policydb *p, struct cond_node *list, void *fp);
  73
  74void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
  75                struct av_decision *avd, struct extended_perms *xperms);
  76void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
  77                struct extended_perms_decision *xpermd);
  78int evaluate_cond_node(struct policydb *p, struct cond_node *node);
  79
  80#endif /* _CONDITIONAL_H_ */
  81