Bluetooth: Refactor hci_get_auth_req()

Refactor the code without changing its behavior by handling the
no-bonding cases first followed by General Bonding.

Signed-off-by: Mikel Astiz <mikel.astiz@bmw-carit.de>
Signed-off-by: Timo Mueller <timo.mueller@bmw-carit.de>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 84acc4aabc5f19d624483996e82bf4a29c2c9dea..08016683e8aac7b9482698ecff481ba21cbf131d 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3419,24 +3419,25 @@ unlock:
 
 static u8 hci_get_auth_req(struct hci_conn *conn)
 {
-       /* If remote requests dedicated bonding follow that lead */
-       if (conn->remote_auth == HCI_AT_DEDICATED_BONDING ||
-           conn->remote_auth == HCI_AT_DEDICATED_BONDING_MITM) {
-               /* If both remote and local IO capabilities allow MITM
-                * protection then require it, otherwise don't */
-               if (conn->remote_cap == HCI_IO_NO_INPUT_OUTPUT ||
-                   conn->io_capability == HCI_IO_NO_INPUT_OUTPUT)
-                       return HCI_AT_DEDICATED_BONDING;
-               else
-                       return HCI_AT_DEDICATED_BONDING_MITM;
-       }
-
        /* If remote requests no-bonding follow that lead */
        if (conn->remote_auth == HCI_AT_NO_BONDING ||
            conn->remote_auth == HCI_AT_NO_BONDING_MITM)
                return conn->remote_auth | (conn->auth_type & 0x01);
 
-       return conn->auth_type;
+       /* For general bonding, use the given auth_type */
+       if (conn->remote_auth == HCI_AT_GENERAL_BONDING ||
+           conn->remote_auth == HCI_AT_GENERAL_BONDING_MITM)
+               return conn->auth_type;
+
+       /* If both remote and local have enough IO capabilities, require
+        * MITM protection
+        */
+       if (conn->remote_cap != HCI_IO_NO_INPUT_OUTPUT &&
+           conn->io_capability != HCI_IO_NO_INPUT_OUTPUT)
+               return conn->remote_auth | 0x01;
+
+       /* No MITM protection possible so remove requirement */
+       return conn->remote_auth & ~0x01;
 }
 
 static void hci_io_capa_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
@@ -3466,8 +3467,14 @@ static void hci_io_capa_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
                 * to DisplayYesNo as it is not supported by BT spec. */
                cp.capability = (conn->io_capability == 0x04) ?
                                HCI_IO_DISPLAY_YESNO : conn->io_capability;
-               conn->auth_type = hci_get_auth_req(conn);
-               cp.authentication = conn->auth_type;
+
+               /* If we are initiators, there is no remote information yet */
+               if (conn->remote_auth == 0xff) {
+                       cp.authentication = conn->auth_type;
+               } else {
+                       conn->auth_type = hci_get_auth_req(conn);
+                       cp.authentication = conn->auth_type;
+               }
 
                if (hci_find_remote_oob_data(hdev, &conn->dst) &&
                    (conn->out || test_bit(HCI_CONN_REMOTE_OOB, &conn->flags)))