[Bluetooth] Track the class of device value

The class of device is only available from an inquiry response or
from the connection request. In the case of an incoming connection
the value can be taken from the request and stored in the hci_conn
structure. For an outgoing connection the value from the inquiry
cache is used or it is set to zero.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci_core.h

@@ -152,6 +152,7 @@ struct hci_conn {
 	__u16		 state;
 	__u8		 type;
 	__u8		 out;
+	__u8		 dev_class[3];
 	__u32		 link_mode;
 	unsigned long	 pend;
 	

net/bluetooth/hci_conn.c

@@ -74,6 +74,7 @@ void hci_acl_connect(struct hci_conn *conn)
 		cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 		cp.pscan_mode     = ie->data.pscan_mode;
 		cp.clock_offset   = ie->data.clock_offset | __cpu_to_le16(0x8000);
+		memcpy(conn->dev_class, ie->data.dev_class, 3);
 	}
 
 	cp.pkt_type = __cpu_to_le16(hdev->pkt_type & ACL_PTYPE_MASK);

net/bluetooth/hci_event.c

@@ -555,6 +555,7 @@ static inline void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *sk
 				return;
 			}
 		}
+		memcpy(conn->dev_class, ev->dev_class, 3);
 		conn->state = BT_CONNECT;
 		hci_dev_unlock(hdev);