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1 /* user-type.h: User-defined key type 1 /* user-type.h: User-defined key type
2 * 2 *
3 * Copyright (C) 2005 Red Hat, Inc. All Rights 3 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.c 4 * Written by David Howells (dhowells@redhat.com)
5 * 5 *
6 * This program is free software; you can redi 6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Genera 7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundatio 8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any l 9 * 2 of the License, or (at your option) any later version.
10 */ 10 */
11 11
12 #ifndef _KEYS_USER_TYPE_H 12 #ifndef _KEYS_USER_TYPE_H
13 #define _KEYS_USER_TYPE_H 13 #define _KEYS_USER_TYPE_H
14 14
15 #include <linux/key.h> 15 #include <linux/key.h>
16 #include <linux/rcupdate.h> 16 #include <linux/rcupdate.h>
17 17
18 /********************************************* 18 /*****************************************************************************/
19 /* 19 /*
20 * the payload for a key of type "user" 20 * the payload for a key of type "user"
21 * - once filled in and attached to a key: 21 * - once filled in and attached to a key:
22 * - the payload struct is invariant may not 22 * - the payload struct is invariant may not be changed, only replaced
23 * - the payload must be read with RCU proce 23 * - the payload must be read with RCU procedures or with the key semaphore
24 * held 24 * held
25 * - the payload may only be replaced with t 25 * - the payload may only be replaced with the key semaphore write-locked
26 * - the key's data length is the size of the 26 * - the key's data length is the size of the actual data, not including the
27 * payload wrapper 27 * payload wrapper
28 */ 28 */
29 struct user_key_payload { 29 struct user_key_payload {
30 struct rcu_head rcu; /* RCU 30 struct rcu_head rcu; /* RCU destructor */
31 unsigned short datalen; /* len 31 unsigned short datalen; /* length of this data */
32 char data[0]; /* act 32 char data[0]; /* actual data */
33 }; 33 };
34 34
35 extern struct key_type key_type_user; 35 extern struct key_type key_type_user;
36 36
37 extern int user_instantiate(struct key *key, c 37 extern int user_instantiate(struct key *key, const void *data, size_t datalen);
38 extern int user_update(struct key *key, const 38 extern int user_update(struct key *key, const void *data, size_t datalen);
39 extern int user_match(const struct key *key, c 39 extern int user_match(const struct key *key, const void *criterion);
40 extern void user_revoke(struct key *key); 40 extern void user_revoke(struct key *key);
41 extern void user_destroy(struct key *key); 41 extern void user_destroy(struct key *key);
42 extern void user_describe(const struct key *us 42 extern void user_describe(const struct key *user, struct seq_file *m);
43 extern long user_read(const struct key *key, 43 extern long user_read(const struct key *key,
44 char __user *buffer, siz 44 char __user *buffer, size_t buflen);
45 45
46 46
47 #endif /* _KEYS_USER_TYPE_H */ 47 #endif /* _KEYS_USER_TYPE_H */
48 48
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