libceph: Create a new key type "ceph".
This allows us to use existence of the key type as a feature test,
from userspace.
Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/net/ceph/crypto.c b/net/ceph/crypto.c
index 75f0893..5a8009c 100644
--- a/net/ceph/crypto.c
+++ b/net/ceph/crypto.c
@@ -5,7 +5,9 @@
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <crypto/hash.h>
+#include <linux/key-type.h>
+#include <keys/ceph-type.h>
#include <linux/ceph/decode.h>
#include "crypto.h"
@@ -421,3 +423,63 @@
return -EINVAL;
}
}
+
+int ceph_key_instantiate(struct key *key, const void *data, size_t datalen)
+{
+ struct ceph_crypto_key *ckey;
+ int ret;
+ void *p;
+
+ ret = -EINVAL;
+ if (datalen <= 0 || datalen > 32767 || !data)
+ goto err;
+
+ ret = key_payload_reserve(key, datalen);
+ if (ret < 0)
+ goto err;
+
+ ret = -ENOMEM;
+ ckey = kmalloc(sizeof(*ckey), GFP_KERNEL);
+ if (!ckey)
+ goto err;
+
+ /* TODO ceph_crypto_key_decode should really take const input */
+ p = (void*)data;
+ ret = ceph_crypto_key_decode(ckey, &p, (char*)data+datalen);
+ if (ret < 0)
+ goto err_ckey;
+
+ key->payload.data = ckey;
+ return 0;
+
+err_ckey:
+ kfree(ckey);
+err:
+ return ret;
+}
+
+int ceph_key_match(const struct key *key, const void *description)
+{
+ return strcmp(key->description, description) == 0;
+}
+
+void ceph_key_destroy(struct key *key) {
+ struct ceph_crypto_key *ckey = key->payload.data;
+
+ ceph_crypto_key_destroy(ckey);
+}
+
+struct key_type key_type_ceph = {
+ .name = "ceph",
+ .instantiate = ceph_key_instantiate,
+ .match = ceph_key_match,
+ .destroy = ceph_key_destroy,
+};
+
+int ceph_crypto_init(void) {
+ return register_key_type(&key_type_ceph);
+}
+
+void ceph_crypto_shutdown(void) {
+ unregister_key_type(&key_type_ceph);
+}
