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 { 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 */ 41 struct 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 */ 53 struct 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 61 int cond_policydb_init(struct policydb *p); 62 void cond_policydb_destroy(struct policydb *p); 63 64 int cond_init_bool_indexes(struct policydb *p); 65 int cond_destroy_bool(void *key, void *datum, void *p); 66 67 int cond_index_bool(void *key, void *datum, void *datap); 68 69 int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp); 70 int cond_read_list(struct policydb *p, void *fp); 71 int cond_write_bool(void *key, void *datum, void *ptr); 72 int cond_write_list(struct policydb *p, struct cond_node *list, void *fp); 73 74 void cond_compute_av(struct avtab *ctab, struct avtab_key *key, 75 struct av_decision *avd, struct extended_perms *xperms); 76 void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key, 77 struct extended_perms_decision *xpermd); 78 int evaluate_cond_node(struct policydb *p, struct cond_node *node); 79 80 #endif /* _CONDITIONAL_H_ */ 81