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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/* user-type.h: User-defined key type3 *4 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.5 * Written by David Howells (dhowells@redhat.com)6 */7 8#ifndef _KEYS_USER_TYPE_H9#define _KEYS_USER_TYPE_H10 11#include <linux/key.h>12#include <linux/rcupdate.h>13 14#ifdef CONFIG_KEYS15 16/*****************************************************************************/17/*18 * the payload for a key of type "user" or "logon"19 * - once filled in and attached to a key:20 * - the payload struct is invariant may not be changed, only replaced21 * - the payload must be read with RCU procedures or with the key semaphore22 * held23 * - the payload may only be replaced with the key semaphore write-locked24 * - the key's data length is the size of the actual data, not including the25 * payload wrapper26 */27struct user_key_payload {28 struct rcu_head rcu; /* RCU destructor */29 unsigned short datalen; /* length of this data */30 char data[] __aligned(__alignof__(u64)); /* actual data */31};32 33extern struct key_type key_type_user;34extern struct key_type key_type_logon;35 36struct key_preparsed_payload;37 38extern int user_preparse(struct key_preparsed_payload *prep);39extern void user_free_preparse(struct key_preparsed_payload *prep);40extern int user_update(struct key *key, struct key_preparsed_payload *prep);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, char *buffer, size_t buflen);45 46static inline const struct user_key_payload *user_key_payload_rcu(const struct key *key)47{48 return (struct user_key_payload *)dereference_key_rcu(key);49}50 51static inline struct user_key_payload *user_key_payload_locked(const struct key *key)52{53 return (struct user_key_payload *)dereference_key_locked((struct key *)key);54}55 56#endif /* CONFIG_KEYS */57 58#endif /* _KEYS_USER_TYPE_H */59