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/* user-type.h: User-defined key type
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
#include <linux/key.h>
#include <linux/rcupdate.h>
* the payload for a key of type "user" or "logon"
* - once filled in and attached to a key:
* - the payload struct is invariant may not be changed, only replaced
* - the payload must be read with RCU procedures or with the key semaphore
* held
* - the payload may only be replaced with the key semaphore write-locked
* - the key's data length is the size of the actual data, not including the
* payload wrapper
struct user_key_payload {
struct rcu_head rcu; /* RCU destructor */
unsigned short datalen; /* length of this data */
char data[0] __aligned(__alignof__(u64)); /* actual data */
extern struct key_type key_type_user;
extern struct key_type key_type_logon;
struct key_preparsed_payload;
extern int user_preparse(struct key_preparsed_payload *prep);
extern void user_free_preparse(struct key_preparsed_payload *prep);
extern int user_update(struct key *key, struct key_preparsed_payload *prep);
extern void user_revoke(struct key *key);
extern void user_destroy(struct key *key);
extern void user_describe(const struct key *user, struct seq_file *m);
extern long user_read(const struct key *key,
char __user *buffer, size_t buflen);
static inline const struct user_key_payload *user_key_payload_rcu(const struct key *key)
return (struct user_key_payload *)dereference_key_rcu(key);
static inline struct user_key_payload *user_key_payload_locked(const struct key *key)
return (struct user_key_payload *)dereference_key_locked((struct key *)key);
#endif /* CONFIG_KEYS */
#endif /* _KEYS_USER_TYPE_H */