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TOMOYO Linux Cross Reference
Linux/security/selinux/ss/sidtab.h

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  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;
 29 #define SIDTAB_CACHE_LEN        3
 30         struct sidtab_node *cache[SIDTAB_CACHE_LEN];
 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);
 37 struct context *sidtab_search_force(struct sidtab *s, u32 sid);
 38 
 39 int sidtab_map(struct sidtab *s,
 40                int (*apply) (u32 sid,
 41                              struct context *context,
 42                              void *args),
 43                void *args);
 44 
 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 
 57 

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