| /* Authors: Karl MacMillan <kmacmillan@tresys.com> |
| * Frank Mayer <mayerf@tresys.com> |
| * |
| * Copyright (C) 2003 - 2005 Tresys Technology, LLC |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef _SEPOL_POLICYDB_CONDITIONAL_H_ |
| #define _SEPOL_POLICYDB_CONDITIONAL_H_ |
| |
| #include <sepol/policydb/flask_types.h> |
| #include <sepol/policydb/avtab.h> |
| #include <sepol/policydb/symtab.h> |
| #include <sepol/policydb/policydb.h> |
| #include <sys/cdefs.h> |
| |
| __BEGIN_DECLS |
| |
| #define COND_EXPR_MAXDEPTH 10 |
| |
| /* this is the max unique bools in a conditional expression |
| * for which we precompute all outcomes for the expression. |
| * |
| * NOTE - do _NOT_ use value greater than 5 because |
| * cond_node_t->expr_pre_comp can only hold at most 32 values |
| */ |
| #define COND_MAX_BOOLS 5 |
| |
| /* |
| * A conditional expression is a list of operators and operands |
| * in reverse polish notation. |
| */ |
| typedef 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 COND_NEQ |
| uint32_t expr_type; |
| uint32_t bool; |
| struct cond_expr *next; |
| } cond_expr_t; |
| |
| /* |
| * Each cond_node_t contains a list of rules to be enabled/disabled |
| * depending on the current value of the conditional expression. This |
| * struct is for that list. |
| */ |
| typedef struct cond_av_list { |
| avtab_ptr_t node; |
| struct cond_av_list *next; |
| } cond_av_list_t; |
| |
| /* |
| * 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).. |
| */ |
| typedef struct cond_node { |
| int cur_state; |
| cond_expr_t *expr; |
| /* these true/false lists point into te_avtab when that is used */ |
| cond_av_list_t *true_list; |
| cond_av_list_t *false_list; |
| /* and these are used during parsing and for modules */ |
| avrule_t *avtrue_list; |
| avrule_t *avfalse_list; |
| /* these fields are not written to binary policy */ |
| unsigned int nbools; |
| uint32_t bool_ids[COND_MAX_BOOLS]; |
| uint32_t expr_pre_comp; |
| struct cond_node *next; |
| /* a tunable conditional, calculated and used at expansion */ |
| #define COND_NODE_FLAGS_TUNABLE 0x01 |
| uint32_t flags; |
| } cond_node_t; |
| |
| extern int cond_evaluate_expr(policydb_t * p, cond_expr_t * expr); |
| extern cond_expr_t *cond_copy_expr(cond_expr_t * expr); |
| |
| extern int cond_expr_equal(cond_node_t * a, cond_node_t * b); |
| extern int cond_normalize_expr(policydb_t * p, cond_node_t * cn); |
| extern void cond_node_destroy(cond_node_t * node); |
| extern void cond_expr_destroy(cond_expr_t * expr); |
| |
| extern cond_node_t *cond_node_find(policydb_t * p, |
| cond_node_t * needle, cond_node_t * haystack, |
| int *was_created); |
| |
| extern cond_node_t *cond_node_create(policydb_t * p, cond_node_t * node); |
| |
| extern cond_node_t *cond_node_search(policydb_t * p, cond_node_t * list, |
| cond_node_t * cn); |
| |
| extern int evaluate_conds(policydb_t * p); |
| |
| extern avtab_datum_t *cond_av_list_search(avtab_key_t * key, |
| cond_av_list_t * cond_list); |
| |
| extern void cond_av_list_destroy(cond_av_list_t * list); |
| |
| extern void cond_optimize_lists(cond_list_t * cl); |
| |
| extern int cond_policydb_init(policydb_t * p); |
| extern void cond_policydb_destroy(policydb_t * p); |
| extern void cond_list_destroy(cond_list_t * list); |
| |
| extern int cond_init_bool_indexes(policydb_t * p); |
| extern int cond_destroy_bool(hashtab_key_t key, hashtab_datum_t datum, void *p); |
| |
| extern int cond_index_bool(hashtab_key_t key, hashtab_datum_t datum, |
| void *datap); |
| |
| extern int cond_read_bool(policydb_t * p, hashtab_t h, struct policy_file *fp); |
| |
| extern int cond_read_list(policydb_t * p, cond_list_t ** list, void *fp); |
| |
| extern void cond_compute_av(avtab_t * ctab, avtab_key_t * key, |
| struct sepol_av_decision *avd); |
| |
| __END_DECLS |
| #endif /* _CONDITIONAL_H_ */ |