/* Authors: Karl MacMillan * Frank Mayer * * Copyright (C) 2003 - 2004 Tresys Technology, LLC * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2. */ #ifndef _CONDITIONAL_H_ #define _CONDITIONAL_H_ #include "avtab.h" #include "symtab.h" #include "policydb.h" #include "../include/conditional.h" #define COND_EXPR_MAXDEPTH 10 /* * A conditional expression is a list of operators and operands * in reverse polish notation. */ 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 __u32 expr_type; __u32 bool; struct cond_expr *next; }; /* * Each cond_node contains a list of rules to be enabled/disabled * depending on the current value of the conditional expression. This * struct is for that list. */ struct cond_av_list { struct avtab_node *node; struct cond_av_list *next; }; /* * 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).. */ struct cond_node { int cur_state; struct cond_expr *expr; struct cond_av_list *true_list; struct cond_av_list *false_list; struct cond_node *next; }; int cond_policydb_init(struct policydb *p); void cond_policydb_destroy(struct policydb *p); int cond_init_bool_indexes(struct policydb *p); int cond_destroy_bool(void *key, void *datum, void *p); int cond_index_bool(void *key, void *datum, void *datap); int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp); int cond_read_list(struct policydb *p, void *fp); int cond_write_bool(void *key, void *datum, void *ptr); int cond_write_list(struct policydb *p, struct cond_node *list, void *fp); void cond_compute_av(struct avtab *ctab, struct avtab_key *key, struct av_decision *avd, struct extended_perms *xperms); void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key, struct extended_perms_decision *xpermd); int evaluate_cond_node(struct policydb *p, struct cond_node *node); #endif /* _CONDITIONAL_H_ */ hor

path: root/net/sched/cls_fw.c

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