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Linux/include/keys/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 (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 #ifdef CONFIG_KEYS
 19 
 20 /*****************************************************************************/
 21 /*
 22  * the payload for a key of type "user" or "logon"
 23  * - once filled in and attached to a key:
 24  *   - the payload struct is invariant may not be changed, only replaced
 25  *   - the payload must be read with RCU procedures or with the key semaphore
 26  *     held
 27  *   - the payload may only be replaced with the key semaphore write-locked
 28  * - the key's data length is the size of the actual data, not including the
 29  *   payload wrapper
 30  */
 31 struct user_key_payload {
 32         struct rcu_head rcu;            /* RCU destructor */
 33         unsigned short  datalen;        /* length of this data */
 34         char            data[0] __aligned(__alignof__(u64)); /* actual data */
 35 };
 36 
 37 extern struct key_type key_type_user;
 38 extern struct key_type key_type_logon;
 39 
 40 struct key_preparsed_payload;
 41 
 42 extern int user_preparse(struct key_preparsed_payload *prep);
 43 extern void user_free_preparse(struct key_preparsed_payload *prep);
 44 extern int user_update(struct key *key, struct key_preparsed_payload *prep);
 45 extern void user_revoke(struct key *key);
 46 extern void user_destroy(struct key *key);
 47 extern void user_describe(const struct key *user, struct seq_file *m);
 48 extern long user_read(const struct key *key,
 49                       char __user *buffer, size_t buflen);
 50 
 51 static inline const struct user_key_payload *user_key_payload_rcu(const struct key *key)
 52 {
 53         return (struct user_key_payload *)dereference_key_rcu(key);
 54 }
 55 
 56 static inline struct user_key_payload *user_key_payload_locked(const struct key *key)
 57 {
 58         return (struct user_key_payload *)dereference_key_locked((struct key *)key);
 59 }
 60 
 61 #endif /* CONFIG_KEYS */
 62 
 63 #endif /* _KEYS_USER_TYPE_H */
 64 

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