[mirror_ubuntu-artful-kernel.git] / security / selinux / ss / sidtab.h

/*
 * A security identifier table (sidtab) is a hash table
 * of security context structures indexed by SID value.
 *
 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
 */
#ifndef _SS_SIDTAB_H_
#define _SS_SIDTAB_H_

#include "context.h"

struct sidtab_node {
	u32 sid;		/* security identifier */
	struct context context;	/* security context structure */
	struct sidtab_node *next;
};

#define SIDTAB_HASH_BITS 7
#define SIDTAB_HASH_BUCKETS (1 << SIDTAB_HASH_BITS)
#define SIDTAB_HASH_MASK (SIDTAB_HASH_BUCKETS-1)

#define SIDTAB_SIZE SIDTAB_HASH_BUCKETS

struct sidtab {
	struct sidtab_node **htable;
	unsigned int nel;	/* number of elements */
	unsigned int next_sid;	/* next SID to allocate */
	unsigned char shutdown;
#define SIDTAB_CACHE_LEN	3
	struct sidtab_node *cache[SIDTAB_CACHE_LEN];
	spinlock_t lock;
};

int sidtab_init(struct sidtab *s);
int sidtab_insert(struct sidtab *s, u32 sid, struct context *context);
struct context *sidtab_search(struct sidtab *s, u32 sid);
struct context *sidtab_search_force(struct sidtab *s, u32 sid);

int sidtab_map(struct sidtab *s,
	       int (*apply) (u32 sid,
			     struct context *context,
			     void *args),
	       void *args);

int sidtab_context_to_sid(struct sidtab *s,
			  struct context *context,
			  u32 *sid);

void sidtab_hash_eval(struct sidtab *h, char *tag);
void sidtab_destroy(struct sidtab *s);
void sidtab_set(struct sidtab *dst, struct sidtab *src);
void sidtab_shutdown(struct sidtab *s);

#endif	/* _SS_SIDTAB_H_ */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* A security identifier table (sidtab) is a hash table
	3	* of security context structures indexed by SID value.
	4	*
	5	* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
	6	*/
	7	#ifndef _SS_SIDTAB_H_
	8	#define _SS_SIDTAB_H_
	9
	10	#include "context.h"
	11
	12	struct sidtab_node {
	13	u32 sid; /* security identifier */
	14	struct context context; /* security context structure */
	15	struct sidtab_node *next;
	16	};
	17
	18	#define SIDTAB_HASH_BITS 7
	19	#define SIDTAB_HASH_BUCKETS (1 << SIDTAB_HASH_BITS)
	20	#define SIDTAB_HASH_MASK (SIDTAB_HASH_BUCKETS-1)
	21
	22	#define SIDTAB_SIZE SIDTAB_HASH_BUCKETS
	23
	24	struct sidtab {
	25	struct sidtab_node **htable;
	26	unsigned int nel; /* number of elements */
	27	unsigned int next_sid; /* next SID to allocate */
	28	unsigned char shutdown;
73ff5fc0 EP	29	#define SIDTAB_CACHE_LEN 3
73ff5fc0 EP	30	struct sidtab_node *cache[SIDTAB_CACHE_LEN];
1da177e4 LT	31	spinlock_t lock;
	32	};
	33
	34	int sidtab_init(struct sidtab *s);
	35	int sidtab_insert(struct sidtab s, u32 sid, struct context context);
	36	struct context sidtab_search(struct sidtab s, u32 sid);
12b29f34	37	struct context sidtab_search_force(struct sidtab s, u32 sid);
1da177e4 LT	38
	39	int sidtab_map(struct sidtab *s,
	40	int (*apply) (u32 sid,
	41	struct context *context,
	42	void *args),
	43	void *args);
	44
1da177e4 LT	45	int sidtab_context_to_sid(struct sidtab *s,
	46	struct context *context,
	47	u32 *sid);
	48
	49	void sidtab_hash_eval(struct sidtab h, char tag);
	50	void sidtab_destroy(struct sidtab *s);
	51	void sidtab_set(struct sidtab dst, struct sidtab src);
	52	void sidtab_shutdown(struct sidtab *s);
	53
	54	#endif /* _SS_SIDTAB_H_ */
	55
	56