sidtab.h

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/*
 * A security identifier table (sidtab) is a hash table
 * of security context structures indexed by SID value.
 *
 * Author : Stephen Smalley, <[email protected]>
 */
#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_ */