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/*****************************************************************************/
  19/*
  20 * the payload for a key of type "user" or "logon"
  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 */
  29struct 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
  35extern struct key_type key_type_user;
  36extern struct key_type key_type_logon;
  37
  38extern int user_instantiate(struct key *key, const void *data, size_t datalen);
  39extern int user_update(struct key *key, const void *data, size_t datalen);
  40extern int user_match(const struct key *key, const void *criterion);
  41extern void user_revoke(struct key *key);
  42extern void user_destroy(struct key *key);
  43extern void user_describe(const struct key *user, struct seq_file *m);
  44extern long user_read(const struct key *key,
  45                      char __user *buffer, size_t buflen);
  46
  47
  48#endif /* _KEYS_USER_TYPE_H */
  49
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