linux/security/selinux/ss/avtab.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * An access vector table (avtab) is a hash table
 * of access vectors and transition types indexed
 * by a type pair and a class.  An access vector
 * table is used to represent the type enforcement
 * tables.
 *
 *  Author : Stephen Smalley, <[email protected]>
 */

/* Updated: Frank Mayer <[email protected]> and
 *          Karl MacMillan <[email protected]>
 *          Added conditional policy language extensions
 *          Copyright (C) 2003 Tresys Technology, LLC
 *
 * Updated: Yuichi Nakamura <[email protected]>
 *          Tuned number of hash slots for avtab to reduce memory usage
 */

#ifndef _SS_AVTAB_H_
#define _SS_AVTAB_H_

#include "security.h"

struct avtab_key { … };

/*
 * For operations that require more than the 32 permissions provided by the avc
 * extended permissions may be used to provide 256 bits of permissions.
 */
struct avtab_extended_perms { … };

struct avtab_datum { … };

struct avtab_node { … };

struct avtab { … };

void avtab_init(struct avtab *h);
int avtab_alloc(struct avtab *, u32);
int avtab_alloc_dup(struct avtab *new, const struct avtab *orig);
void avtab_destroy(struct avtab *h);

#define MAX_AVTAB_HASH_BITS …
#define MAX_AVTAB_HASH_BUCKETS …

#ifdef CONFIG_SECURITY_SELINUX_DEBUG
void avtab_hash_eval(struct avtab *h, const char *tag);
#else
static inline void avtab_hash_eval(struct avtab *h, const char *tag)
{
}
#endif

struct policydb;
int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol,
		    int (*insert)(struct avtab *a, const struct avtab_key *k,
				  const struct avtab_datum *d, void *p),
		    void *p);

int avtab_read(struct avtab *a, void *fp, struct policydb *pol);
int avtab_write_item(struct policydb *p, const struct avtab_node *cur,
		     void *fp);
int avtab_write(struct policydb *p, struct avtab *a, void *fp);

struct avtab_node *avtab_insert_nonunique(struct avtab *h,
					  const struct avtab_key *key,
					  const struct avtab_datum *datum);

struct avtab_node *avtab_search_node(struct avtab *h,
				     const struct avtab_key *key);
struct avtab_node *avtab_search_node_next(struct avtab_node *node,
					  u16 specified);

#endif /* _SS_AVTAB_H_ */