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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 ([email protected])
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" or "logon"
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  */
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 extern struct key_type key_type_logon;
37 
38 struct key_preparsed_payload;
39 
40 extern int user_instantiate(struct key *key, struct key_preparsed_payload *prep);
41 extern int user_update(struct key *key, struct key_preparsed_payload *prep);
42 extern int user_match(const struct key *key, const void *criterion);
43 extern void user_revoke(struct key *key);
44 extern void user_destroy(struct key *key);
45 extern void user_describe(const struct key *user, struct seq_file *m);
46 extern long user_read(const struct key *key,
47  char __user *buffer, size_t buflen);
48 
49 
50 #endif /* _KEYS_USER_TYPE_H */