-/*****************************************************************************/
-/*
- * kernel managed key type definition
- */
-typedef int (*request_key_actor_t)(struct key *key, struct key *authkey, const char *op);
-
-struct key_type {
- /* name of the type */
- const char *name;
-
- /* default payload length for quota precalculation (optional)
- * - this can be used instead of calling key_payload_reserve(), that
- * function only needs to be called if the real datalen is different
- */
- size_t def_datalen;
-
- /* instantiate a key of this type
- * - this method should call key_payload_reserve() to determine if the
- * user's quota will hold the payload
- */
- int (*instantiate)(struct key *key, const void *data, size_t datalen);
-
- /* update a key of this type (optional)
- * - this method should call key_payload_reserve() to recalculate the
- * quota consumption
- * - the key must be locked against read when modifying
- */
- int (*update)(struct key *key, const void *data, size_t datalen);
-
- /* match a key against a description */
- int (*match)(const struct key *key, const void *desc);
-
- /* clear some of the data from a key on revokation (optional)
- * - the key's semaphore will be write-locked by the caller
- */
- void (*revoke)(struct key *key);
-
- /* clear the data from a key (optional) */
- void (*destroy)(struct key *key);
-
- /* describe a key */
- void (*describe)(const struct key *key, struct seq_file *p);
-
- /* read a key's data (optional)
- * - permission checks will be done by the caller
- * - the key's semaphore will be readlocked by the caller
- * - should return the amount of data that could be read, no matter how
- * much is copied into the buffer
- * - shouldn't do the copy if the buffer is NULL
- */
- long (*read)(const struct key *key, char __user *buffer, size_t buflen);
-
- /* handle request_key() for this type instead of invoking
- * /sbin/request-key (optional)
- * - key is the key to instantiate
- * - authkey is the authority to assume when instantiating this key
- * - op is the operation to be done, usually "create"
- * - the call must not return until the instantiation process has run
- * its course
- */
- request_key_actor_t request_key;
-
- /* internal fields */
- struct list_head link; /* link in types list */
-};
-
-extern struct key_type key_type_keyring;
-
-extern int register_key_type(struct key_type *ktype);
-extern void unregister_key_type(struct key_type *ktype);
-