David Howells | 2aa349f | 2005-10-30 15:02:42 -0800 | [diff] [blame] | 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); |
David Howells | 2aa349f | 2005-10-30 15:02:42 -0800 | [diff] [blame] | 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_destroy(struct key *key); |
| 41 | extern void user_describe(const struct key *user, struct seq_file *m); |
| 42 | extern long user_read(const struct key *key, |
| 43 | char __user *buffer, size_t buflen); |
| 44 | |
| 45 | |
| 46 | #endif /* _KEYS_USER_TYPE_H */ |