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-rw-r--r--include/keys/user-type.h6
-rw-r--r--include/linux/key-type.h35
2 files changed, 37 insertions, 4 deletions
diff --git a/include/keys/user-type.h b/include/keys/user-type.h
index bc9ec1d7698c..5e452c84f1e6 100644
--- a/include/keys/user-type.h
+++ b/include/keys/user-type.h
@@ -35,8 +35,10 @@ struct user_key_payload {
extern struct key_type key_type_user;
extern struct key_type key_type_logon;
-extern int user_instantiate(struct key *key, const void *data, size_t datalen);
-extern int user_update(struct key *key, const void *data, size_t datalen);
+struct key_preparsed_payload;
+
+extern int user_instantiate(struct key *key, struct key_preparsed_payload *prep);
+extern int user_update(struct key *key, struct key_preparsed_payload *prep);
extern int user_match(const struct key *key, const void *criterion);
extern void user_revoke(struct key *key);
extern void user_destroy(struct key *key);
diff --git a/include/linux/key-type.h b/include/linux/key-type.h
index f0c651cda7b0..518a53afb9ea 100644
--- a/include/linux/key-type.h
+++ b/include/linux/key-type.h
@@ -26,6 +26,27 @@ struct key_construction {
struct key *authkey;/* authorisation for key being constructed */
};
+/*
+ * Pre-parsed payload, used by key add, update and instantiate.
+ *
+ * This struct will be cleared and data and datalen will be set with the data
+ * and length parameters from the caller and quotalen will be set from
+ * def_datalen from the key type. Then if the preparse() op is provided by the
+ * key type, that will be called. Then the struct will be passed to the
+ * instantiate() or the update() op.
+ *
+ * If the preparse() op is given, the free_preparse() op will be called to
+ * clear the contents.
+ */
+struct key_preparsed_payload {
+ char *description; /* Proposed key description (or NULL) */
+ void *type_data[2]; /* Private key-type data */
+ void *payload; /* Proposed payload */
+ const void *data; /* Raw data */
+ size_t datalen; /* Raw datalen */
+ size_t quotalen; /* Quota length for proposed payload */
+};
+
typedef int (*request_key_actor_t)(struct key_construction *key,
const char *op, void *aux);
@@ -45,18 +66,28 @@ struct key_type {
/* vet a description */
int (*vet_description)(const char *description);
+ /* Preparse the data blob from userspace that is to be the payload,
+ * generating a proposed description and payload that will be handed to
+ * the instantiate() and update() ops.
+ */
+ int (*preparse)(struct key_preparsed_payload *prep);
+
+ /* Free a preparse data structure.
+ */
+ void (*free_preparse)(struct key_preparsed_payload *prep);
+
/* 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);
+ int (*instantiate)(struct key *key, struct key_preparsed_payload *prep);
/* 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);
+ int (*update)(struct key *key, struct key_preparsed_payload *prep);
/* match a key against a description */
int (*match)(const struct key *key, const void *desc);

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