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