mirror of https://gitee.com/openkylin/linux.git
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* A security identifier table (sidtab) is a hash table
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* of security context structures indexed by SID value.
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*
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* Author : Stephen Smalley, <sds@tycho.nsa.gov>
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*/
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#ifndef _SS_SIDTAB_H_
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#define _SS_SIDTAB_H_
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#include "context.h"
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struct sidtab_node {
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u32 sid; /* security identifier */
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struct context context; /* security context structure */
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struct sidtab_node *next;
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};
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#define SIDTAB_HASH_BITS 7
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#define SIDTAB_HASH_BUCKETS (1 << SIDTAB_HASH_BITS)
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#define SIDTAB_HASH_MASK (SIDTAB_HASH_BUCKETS-1)
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#define SIDTAB_SIZE SIDTAB_HASH_BUCKETS
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struct sidtab {
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struct sidtab_node **htable;
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unsigned int nel; /* number of elements */
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unsigned int next_sid; /* next SID to allocate */
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unsigned char shutdown;
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#define SIDTAB_CACHE_LEN 3
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struct sidtab_node *cache[SIDTAB_CACHE_LEN];
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spinlock_t lock;
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};
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int sidtab_init(struct sidtab *s);
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int sidtab_insert(struct sidtab *s, u32 sid, struct context *context);
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struct context *sidtab_search(struct sidtab *s, u32 sid);
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struct context *sidtab_search_force(struct sidtab *s, u32 sid);
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int sidtab_map(struct sidtab *s,
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int (*apply) (u32 sid,
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struct context *context,
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void *args),
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void *args);
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int sidtab_context_to_sid(struct sidtab *s,
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struct context *context,
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u32 *sid);
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void sidtab_hash_eval(struct sidtab *h, char *tag);
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void sidtab_destroy(struct sidtab *s);
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void sidtab_set(struct sidtab *dst, struct sidtab *src);
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void sidtab_shutdown(struct sidtab *s);
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#endif /* _SS_SIDTAB_H_ */
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