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Linux/security/selinux/ss/sidtab.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * A security identifier table (sidtab) is a hash table
  4  * of security context structures indexed by SID value.
  5  *
  6  * Author : Stephen Smalley, <sds@tycho.nsa.gov>
  7  */
  8 #ifndef _SS_SIDTAB_H_
  9 #define _SS_SIDTAB_H_
 10 
 11 #include "context.h"
 12 
 13 struct sidtab_node {
 14         u32 sid;                /* security identifier */
 15         struct context context; /* security context structure */
 16         struct sidtab_node *next;
 17 };
 18 
 19 #define SIDTAB_HASH_BITS 7
 20 #define SIDTAB_HASH_BUCKETS (1 << SIDTAB_HASH_BITS)
 21 #define SIDTAB_HASH_MASK (SIDTAB_HASH_BUCKETS-1)
 22 
 23 #define SIDTAB_SIZE SIDTAB_HASH_BUCKETS
 24 
 25 struct sidtab {
 26         struct sidtab_node **htable;
 27         unsigned int nel;       /* number of elements */
 28         unsigned int next_sid;  /* next SID to allocate */
 29         unsigned char shutdown;
 30 #define SIDTAB_CACHE_LEN        3
 31         struct sidtab_node *cache[SIDTAB_CACHE_LEN];
 32         spinlock_t lock;
 33 };
 34 
 35 int sidtab_init(struct sidtab *s);
 36 int sidtab_insert(struct sidtab *s, u32 sid, struct context *context);
 37 struct context *sidtab_search(struct sidtab *s, u32 sid);
 38 struct context *sidtab_search_force(struct sidtab *s, u32 sid);
 39 
 40 int sidtab_map(struct sidtab *s,
 41                int (*apply) (u32 sid,
 42                              struct context *context,
 43                              void *args),
 44                void *args);
 45 
 46 int sidtab_context_to_sid(struct sidtab *s,
 47                           struct context *context,
 48                           u32 *sid);
 49 
 50 void sidtab_hash_eval(struct sidtab *h, char *tag);
 51 void sidtab_destroy(struct sidtab *s);
 52 void sidtab_set(struct sidtab *dst, struct sidtab *src);
 53 void sidtab_shutdown(struct sidtab *s);
 54 
 55 #endif  /* _SS_SIDTAB_H_ */
 56 
 57 
 58 

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