| 1 |
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| 2 | |
| 3 | *
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| 4 | * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
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| 5 | * Written by David Howells ([email protected])
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| 6 |
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| 7 |
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| 8 | #ifndef _KEYS_USER_TYPE_H
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| 9 | #define _KEYS_USER_TYPE_H
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| 10 |
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| 11 | #include <linux/key.h>
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| 12 | #include <linux/rcupdate.h>
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| 13 |
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| 14 | #ifdef CONFIG_KEYS
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| 15 |
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| 16 |
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| 17 | |
| 18 | * the payload for a key of type "user" or "logon"
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| 19 | * - once filled in and attached to a key:
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| 20 | * - the payload struct is invariant may not be changed, only replaced
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| 21 | * - the payload must be read with RCU procedures or with the key semaphore
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| 22 | * held
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| 23 | * - the payload may only be replaced with the key semaphore write-locked
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| 24 | * - the key's data length is the size of the actual data, not including the
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| 25 | * payload wrapper
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| 26 |
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| 27 | struct user_key_payload {
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| 28 | struct rcu_head rcu;
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| 29 | unsigned short datalen;
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| 30 | char data[] __aligned(__alignof__(u64));
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| 31 | };
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| 32 |
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| 33 | extern struct key_type key_type_user;
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| 34 | extern struct key_type key_type_logon;
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| 35 |
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| 36 | struct key_preparsed_payload;
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| 37 |
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| 38 | extern int user_preparse(struct key_preparsed_payload *prep);
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| 39 | extern void user_free_preparse(struct key_preparsed_payload *prep);
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| 40 | extern int user_update(struct key *key, struct key_preparsed_payload *prep);
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| 41 | extern void user_revoke(struct key *key);
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| 42 | extern void user_destroy(struct key *key);
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| 43 | extern void user_describe(const struct key *user, struct seq_file *m);
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| 44 | extern long user_read(const struct key *key, char *buffer, size_t buflen);
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| 45 |
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| 46 | static inline const struct user_key_payload *user_key_payload_rcu(const struct key *key)
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| 47 | {
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| 48 | return (struct user_key_payload *)dereference_key_rcu(key);
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| 49 | }
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| 50 |
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| 51 | static inline struct user_key_payload *user_key_payload_locked(const struct key *key)
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| 52 | {
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| 53 | return (struct user_key_payload *)dereference_key_locked((struct key *)key);
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| 54 | }
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| 55 |
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| 56 | #endif
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| 57 |
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| 58 | #endif
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