| /* user-type.h: User-defined key type |
| * |
| * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #ifndef _KEYS_USER_TYPE_H |
| #define _KEYS_USER_TYPE_H |
| |
| #include <linux/key.h> |
| #include <linux/rcupdate.h> |
| |
| #ifdef CONFIG_KEYS |
| |
| /*****************************************************************************/ |
| /* |
| * the payload for a key of type "user" or "logon" |
| * - once filled in and attached to a key: |
| * - the payload struct is invariant may not be changed, only replaced |
| * - the payload must be read with RCU procedures or with the key semaphore |
| * held |
| * - the payload may only be replaced with the key semaphore write-locked |
| * - the key's data length is the size of the actual data, not including the |
| * payload wrapper |
| */ |
| struct user_key_payload { |
| struct rcu_head rcu; /* RCU destructor */ |
| unsigned short datalen; /* length of this data */ |
| char data[0] __aligned(__alignof__(u64)); /* actual data */ |
| }; |
| |
| extern struct key_type key_type_user; |
| extern struct key_type key_type_logon; |
| |
| struct key_preparsed_payload; |
| |
| extern int user_preparse(struct key_preparsed_payload *prep); |
| extern void user_free_preparse(struct key_preparsed_payload *prep); |
| extern int user_update(struct key *key, struct key_preparsed_payload *prep); |
| extern void user_revoke(struct key *key); |
| extern void user_destroy(struct key *key); |
| extern void user_describe(const struct key *user, struct seq_file *m); |
| extern long user_read(const struct key *key, char *buffer, size_t buflen); |
| |
| static inline const struct user_key_payload *user_key_payload_rcu(const struct key *key) |
| { |
| return (struct user_key_payload *)dereference_key_rcu(key); |
| } |
| |
| static inline struct user_key_payload *user_key_payload_locked(const struct key *key) |
| { |
| return (struct user_key_payload *)dereference_key_locked((struct key *)key); |
| } |
| |
| #endif /* CONFIG_KEYS */ |
| |
| #endif /* _KEYS_USER_TYPE_H */ |