[PATCH] Bluetooth: Use defined link key size

[Andrei Emeltchenko <Andrei.Emeltchenko.news@gmail.com>]

From: Andrei Emeltchenko <andrei.emeltchenko@intel.com>

Remove magic number with defined link key size. This is especially
useful for calculation other keys which are 2 * key_size, etc that
makes usage of magic numbers too much.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
---
 include/net/bluetooth/bluetooth.h |    2 ++
 include/net/bluetooth/hci.h       |    4 ++--
 include/net/bluetooth/hci_core.h  |    2 +-
 net/bluetooth/hci_core.c          |    2 +-
 net/bluetooth/hci_event.c         |    2 +-
 net/bluetooth/mgmt.c              |    2 +-
 6 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 2fb268f..0186d38 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -68,6 +68,8 @@ struct bt_security {
 #define BT_SECURITY_MEDIUM	2
 #define BT_SECURITY_HIGH	3
 
+#define BT_SEC_LINK_KEY_SIZE		16
+
 #define BT_DEFER_SETUP	7
 
 #define BT_FLUSHABLE	8
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 66a7b57..6ab8d0b 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -371,7 +371,7 @@ struct hci_cp_reject_conn_req {
 #define HCI_OP_LINK_KEY_REPLY		0x040b
 struct hci_cp_link_key_reply {
 	bdaddr_t bdaddr;
-	__u8     link_key[16];
+	__u8     link_key[BT_SEC_LINK_KEY_SIZE];
 } __packed;
 
 #define HCI_OP_LINK_KEY_NEG_REPLY	0x040c
@@ -1048,7 +1048,7 @@ struct hci_ev_link_key_req {
 #define HCI_EV_LINK_KEY_NOTIFY		0x18
 struct hci_ev_link_key_notify {
 	bdaddr_t bdaddr;
-	__u8     link_key[16];
+	__u8     link_key[BT_SEC_LINK_KEY_SIZE];
 	__u8     key_type;
 } __packed;
 
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index b60d2c8..603755a 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -105,7 +105,7 @@ struct link_key {
 	struct list_head list;
 	bdaddr_t bdaddr;
 	u8 type;
-	u8 val[16];
+	u8 val[BT_SEC_LINK_KEY_SIZE];
 	u8 pin_len;
 };
 
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 83d3d35..72a4d58 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1291,7 +1291,7 @@ int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,
 	}
 
 	bacpy(&key->bdaddr, bdaddr);
-	memcpy(key->val, val, 16);
+	memcpy(key->val, val, BT_SEC_LINK_KEY_SIZE);
 	key->pin_len = pin_len;
 
 	if (type == HCI_LK_CHANGED_COMBINATION)
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index d81262a..aa1482f 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2716,7 +2716,7 @@ static inline void hci_link_key_request_evt(struct hci_dev *hdev, struct sk_buff
 	}
 
 	bacpy(&cp.bdaddr, &ev->bdaddr);
-	memcpy(cp.link_key, key->val, 16);
+	memcpy(cp.link_key, key->val, BT_SEC_LINK_KEY_SIZE);
 
 	hci_send_cmd(hdev, HCI_OP_LINK_KEY_REPLY, sizeof(cp), &cp);
 
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 25d2207..bff33e7 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2955,7 +2955,7 @@ int mgmt_new_link_key(struct hci_dev *hdev, struct link_key *key,
 	bacpy(&ev.key.addr.bdaddr, &key->bdaddr);
 	ev.key.addr.type = BDADDR_BREDR;
 	ev.key.type = key->type;
-	memcpy(ev.key.val, key->val, 16);
+	memcpy(ev.key.val, key->val, BT_SEC_LINK_KEY_SIZE);
 	ev.key.pin_len = key->pin_len;
 
 	return mgmt_event(MGMT_EV_NEW_LINK_KEY, hdev, &ev, sizeof(ev), NULL);
-- 
1.7.9.5