Bluetooth: Set link key generation bit if necessary for LE SC

Depending on whether Secure Connections is enabled or not we may need to add
the link key generation bit to the key distribution. This patch does the
necessary modifications to the build_pairing_cmd() function.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 0973e37073e2..d993d7d4fcc8 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -333,6 +333,16 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
         if (test_bit(HCI_PRIVACY, &hdev->dev_flags))
                 local_dist |= SMP_DIST_ID_KEY;
 
+        if (test_bit(HCI_SC_ENABLED, &hdev->dev_flags)) {
+                if ((authreq & SMP_AUTH_SC) &&
+                    test_bit(HCI_SSP_ENABLED, &hdev->dev_flags)) {
+                        local_dist |= SMP_DIST_LINK_KEY;
+                        remote_dist |= SMP_DIST_LINK_KEY;
+                }
+        } else {
+                authreq &= ~SMP_AUTH_SC;
+        }
+
         if (rsp == NULL) {
                 req->io_capability = conn->hcon->io_capability;
                 req->oob_flag = SMP_OOB_NOT_PRESENT;