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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * A security identifier table (sidtab) is a hash table
 * of security context structures indexed by SID value.
 *
 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
 */
#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_isid_entry {
	int set;
	struct context context;
};

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;

	/* index == SID - 1 (no entry for SECSID_NULL) */
	struct sidtab_isid_entry isids[SECINITSID_NUM];
};

int sidtab_init(struct sidtab *s);
int sidtab_set_initial(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_convert(struct sidtab *s, struct sidtab *news,
		   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);

#endif	/* _SS_SIDTAB_H_ */