Bluetooth: Introduce flag for limited discoverable mode

Add a new flag that can be set when in limited discoverable mode. This
flag will cause the limited discoverable bit in the class of device
value to bet set.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/hci.h

@@ -125,6 +125,7 @@ enum {
 	HCI_ADVERTISING,
 	HCI_CONNECTABLE,
 	HCI_DISCOVERABLE,
+	HCI_LIMITED_DISCOVERABLE,
 	HCI_LINK_SECURITY,
 	HCI_PERIODIC_INQ,
 	HCI_FAST_CONNECTABLE,

net/bluetooth/mgmt.c

@@ -724,6 +724,9 @@ static void update_class(struct hci_request *req)
 	cod[1] = hdev->major_class;
 	cod[2] = get_service_classes(hdev);
 
+	if (test_bit(HCI_LIMITED_DISCOVERABLE, &hdev->dev_flags))
+		cod[1] |= 0x20;
+
 	if (memcmp(cod, hdev->dev_class, 3) == 0)
 		return;