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_node {
  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};
  34
  35struct cond_expr {
  36        struct cond_expr_node *nodes;
  37        u32 len;
  38};
  39
  40/*
  41 * Each cond_node contains a list of rules to be enabled/disabled
  42 * depending on the current value of the conditional expression. This
  43 * struct is for that list.
  44 */
  45struct cond_av_list {
  46        struct avtab_node **nodes;
  47        u32 len;
  48};
  49
  50/*
  51 * A cond node represents a conditional block in a policy. It
  52 * contains a conditional expression, the current state of the expression,
  53 * two lists of rules to enable/disable depending on the value of the
  54 * expression (the true list corresponds to if and the false list corresponds
  55 * to else)..
  56 */
  57struct cond_node {
  58        int cur_state;
  59        struct cond_expr expr;
  60        struct cond_av_list true_list;
  61        struct cond_av_list false_list;
  62};
  63
  64void cond_policydb_init(struct policydb *p);
  65void cond_policydb_destroy(struct policydb *p);
  66
  67int cond_init_bool_indexes(struct policydb *p);
  68int cond_destroy_bool(void *key, void *datum, void *p);
  69
  70int cond_index_bool(void *key, void *datum, void *datap);
  71
  72int cond_read_bool(struct policydb *p, struct symtab *s, void *fp);
  73int cond_read_list(struct policydb *p, void *fp);
  74int cond_write_bool(void *key, void *datum, void *ptr);
  75int cond_write_list(struct policydb *p, void *fp);
  76
  77void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
  78                struct av_decision *avd, struct extended_perms *xperms);
  79void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
  80                struct extended_perms_decision *xpermd);
  81void evaluate_cond_nodes(struct policydb *p);
  82void cond_policydb_destroy_dup(struct policydb *p);
  83int cond_policydb_dup(struct policydb *new, struct policydb *orig);
  84
  85#endif /* _CONDITIONAL_H_ */
  86