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/*

 * 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;

        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);

int sidtab_map(struct sidtab *s,

               int (*apply) (u32 sid,

                             struct context *context,

                             void *args),

               void *args);

void sidtab_map_remove_on_error(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_ */