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-rw-r--r--include/keys/user-type.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/include/keys/user-type.h b/include/keys/user-type.h
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1/* user-type.h: User-defined key type
2 *
3 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _KEYS_USER_TYPE_H
13#define _KEYS_USER_TYPE_H
14
15#include <linux/key.h>
16#include <linux/rcupdate.h>
17
18/*****************************************************************************/
19/*
20 * the payload for a key of type "user"
21 * - once filled in and attached to a key:
22 * - the payload struct is invariant may not be changed, only replaced
23 * - the payload must be read with RCU procedures or with the key semaphore
24 * held
25 * - the payload may only be replaced with the key semaphore write-locked
26 * - the key's data length is the size of the actual data, not including the
27 * payload wrapper
28 */
29struct user_key_payload {
30 struct rcu_head rcu; /* RCU destructor */
31 unsigned short datalen; /* length of this data */
32 char data[0]; /* actual data */
33};
34
35extern struct key_type key_type_user;
36
37extern int user_instantiate(struct key *key, const void *data, size_t datalen);
38extern int user_duplicate(struct key *key, const struct key *source);
39extern int user_update(struct key *key, const void *data, size_t datalen);
40extern int user_match(const struct key *key, const void *criterion);
41extern void user_destroy(struct key *key);
42extern void user_describe(const struct key *user, struct seq_file *m);
43extern long user_read(const struct key *key,
44 char __user *buffer, size_t buflen);
45
46
47#endif /* _KEYS_USER_TYPE_H */