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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_ */
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