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authorDavid Howells <dhowells@redhat.com>2005-10-30 15:02:42 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:22 -0800
commit2aa349f6e37ce030060c994d3aebbff4ab703565 (patch)
tree7a0937469f0376931b82d9c3392727dba13c9d45 /include/keys
parent1426d7a81dea8e9d85f9d69de85ab04ba37018ab (diff)
[PATCH] Keys: Export user-defined keyring operations
Export user-defined key operations so that those who wish to define their own key type based on the user-defined key operations may do so (as has been requested). The header file created has been placed into include/keys/user-type.h, thus creating a directory where other key types may also be placed. Any objections to doing this? Signed-Off-By: David Howells <dhowells@redhat.com> Signed-Off-By: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/keys')
-rw-r--r--include/keys/user-type.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/include/keys/user-type.h b/include/keys/user-type.h
new file mode 100644
index 000000000000..26f6ec38577a
--- /dev/null
+++ b/include/keys/user-type.h
@@ -0,0 +1,47 @@
+/* user-type.h: User-defined key type
+ *
+ * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _KEYS_USER_TYPE_H
+#define _KEYS_USER_TYPE_H
+
+#include <linux/key.h>
+#include <linux/rcupdate.h>
+
+/*****************************************************************************/
+/*
+ * the payload for a key of type "user"
+ * - once filled in and attached to a key:
+ * - the payload struct is invariant may not be changed, only replaced
+ * - the payload must be read with RCU procedures or with the key semaphore
+ * held
+ * - the payload may only be replaced with the key semaphore write-locked
+ * - the key's data length is the size of the actual data, not including the
+ * payload wrapper
+ */
+struct user_key_payload {
+ struct rcu_head rcu; /* RCU destructor */
+ unsigned short datalen; /* length of this data */
+ char data[0]; /* actual data */
+};
+
+extern struct key_type key_type_user;
+
+extern int user_instantiate(struct key *key, const void *data, size_t datalen);
+extern int user_duplicate(struct key *key, const struct key *source);
+extern int user_update(struct key *key, const void *data, size_t datalen);
+extern int user_match(const struct key *key, const void *criterion);
+extern void user_destroy(struct key *key);
+extern void user_describe(const struct key *user, struct seq_file *m);
+extern long user_read(const struct key *key,
+ char __user *buffer, size_t buflen);
+
+
+#endif /* _KEYS_USER_TYPE_H */

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