Bluetooth: Add flag to track STK encryption

There are certain subtle differences in behavior when we're encrypted
with the STK, such as allowing re-encryption even though the security
level stays the same. Because of this, add a flag to track whether we're
encrypted with an STK or not.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 8097559ebb48..b0b760dd66a3 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4365,8 +4365,11 @@ static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
          * using a distributed LTK.
          */
         if (ltk->type == SMP_STK) {
+                set_bit(HCI_CONN_STK_ENCRYPT, &conn->flags);
                 list_del(&ltk->list);
                 kfree(ltk);
+        } else {
+                clear_bit(HCI_CONN_STK_ENCRYPT, &conn->flags);
         }
 
         hci_dev_unlock(hdev);