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  */
  22 struct 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
  35 struct 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  */
  45 struct 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  */
  57 struct 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
  64 void cond_policydb_init(struct policydb *p);
  65 void cond_policydb_destroy(struct policydb *p);
  66
  67 int cond_init_bool_indexes(struct policydb *p);
  68 int cond_destroy_bool(void *key, void *datum, void *p);
  69
  70 int cond_index_bool(void *key, void *datum, void *datap);
  71
  72 int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp);
  73 int cond_read_list(struct policydb *p, void *fp);
  74 int cond_write_bool(void *key, void *datum, void *ptr);
  75 int cond_write_list(struct policydb *p, void *fp);
  76
  77 void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
  78                 struct av_decision *avd, struct extended_perms *xperms);
  79 void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
  80                 struct extended_perms_decision *xpermd);
  81 void evaluate_cond_nodes(struct policydb *p);
  82
  83 #endif /* _CONDITIONAL_H_ */