diff options
Diffstat (limited to 'security/selinux/ss/sidtab.h')
-rw-r--r-- | security/selinux/ss/sidtab.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/security/selinux/ss/sidtab.h b/security/selinux/ss/sidtab.h new file mode 100644 index 00000000..84dc154d --- /dev/null +++ b/security/selinux/ss/sidtab.h @@ -0,0 +1,56 @@ +/* + * A security identifier table (sidtab) is a hash table + * of security context structures indexed by SID value. + * + * Author : Stephen Smalley, <sds@epoch.ncsc.mil> + */ +#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 { + 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; +}; + +int sidtab_init(struct sidtab *s); +int sidtab_insert(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_map(struct sidtab *s, + 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); +void sidtab_set(struct sidtab *dst, struct sidtab *src); +void sidtab_shutdown(struct sidtab *s); + +#endif /* _SS_SIDTAB_H_ */ + + |