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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  */
29 struct 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 
35 extern struct key_type key_type_user;
36 
37 extern int user_instantiate(struct key *key, const void *data, size_t datalen);
38 extern int user_update(struct key *key, const void *data, size_t datalen);
39 extern int user_match(const struct key *key, const void *criterion);
40 extern void user_revoke(struct key *key);
41 extern void user_destroy(struct key *key);
42 extern void user_describe(const struct key *user, struct seq_file *m);
43 extern long user_read(const struct key *key,
44 		      char __user *buffer, size_t buflen);
45 
46 
47 #endif /* _KEYS_USER_TYPE_H */
48