1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Authors: Karl MacMillan <kmacmillan@tresys.com> 3 * Frank Mayer <mayerf@tresys.com> 4 * Copyright (C) 2003 - 2004 Tresys Technology, LLC 5 */ 6 7 #ifndef _CONDITIONAL_H_ 8 #define _CONDITIONAL_H_ 9 10 #include "avtab.h" 11 #include "symtab.h" 12 #include "policydb.h" 13 #include "../include/conditional.h" 14 15 #define COND_EXPR_MAXDEPTH 10 16 17 /* 18 * A conditional expression is a list of operators and operands 19 * in reverse polish notation. 20 */ 21 struct cond_expr_node { 22 #define COND_BOOL 1 /* plain bool */ 23 #define COND_NOT 2 /* !bool */ 24 #define COND_OR 3 /* bool || bool */ 25 #define COND_AND 4 /* bool && bool */ 26 #define COND_XOR 5 /* bool ^ bool */ 27 #define COND_EQ 6 /* bool == bool */ 28 #define COND_NEQ 7 /* bool != bool */ 29 #define COND_LAST COND_NEQ 30 u32 expr_type; 31 u32 boolean; 32 }; 33 34 struct cond_expr { 35 struct cond_expr_node *nodes; 36 u32 len; 37 }; 38 39 /* 40 * Each cond_node contains a list of rules to be enabled/disabled 41 * depending on the current value of the conditional expression. This 42 * struct is for that list. 43 */ 44 struct cond_av_list { 45 struct avtab_node **nodes; 46 u32 len; 47 }; 48 49 /* 50 * A cond node represents a conditional block in a policy. It 51 * contains a conditional expression, the current state of the expression, 52 * two lists of rules to enable/disable depending on the value of the 53 * expression (the true list corresponds to if and the false list corresponds 54 * to else).. 55 */ 56 struct cond_node { 57 int cur_state; 58 struct cond_expr expr; 59 struct cond_av_list true_list; 60 struct cond_av_list false_list; 61 }; 62 63 void cond_policydb_init(struct policydb *p); 64 void cond_policydb_destroy(struct policydb *p); 65 66 int cond_init_bool_indexes(struct policydb *p); 67 int cond_destroy_bool(void *key, void *datum, void *p); 68 69 int cond_index_bool(void *key, void *datum, void *datap); 70 71 int cond_read_bool(struct policydb *p, struct symtab *s, void *fp); 72 int cond_read_list(struct policydb *p, void *fp); 73 int cond_write_bool(void *key, void *datum, void *ptr); 74 int cond_write_list(struct policydb *p, void *fp); 75 76 void cond_compute_av(struct avtab *ctab, struct avtab_key *key, 77 struct av_decision *avd, struct extended_perms *xperms); 78 void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key, 79 struct extended_perms_decision *xpermd); 80 void evaluate_cond_nodes(struct policydb *p); 81 void cond_policydb_destroy_dup(struct policydb *p); 82 int cond_policydb_dup(struct policydb *new, const struct policydb *orig); 83 84 #endif /* _CONDITIONAL_H_ */ 85