Bluetooth: mgmt: Make Set Link Security callable while powered off

This patch makes it possible to change the Link Security setting while
powered off and have it automatically enabled when powering on a device.
To track the desired state once powered on a new HCI_LINK_SECURITY flag
is added.

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

2 files changed, 34 insertions, 5 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 2a5d05c05e35..5fb1ee516d3a 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -594,6 +594,12 @@ static void hci_setup(struct hci_dev *hdev)
                                                         sizeof(cp), &cp);
         }
 
+        if (test_bit(HCI_LINK_SECURITY, &hdev->dev_flags)) {
+                u8 enable = 1;
+                hci_send_cmd(hdev, HCI_OP_WRITE_AUTH_ENABLE,
+                                                sizeof(enable), &enable);
+        }
+
         if (hdev->features[4] & LMP_LE)
                 hci_set_le_support(hdev);
 }
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index e8f890d7256a..69d4e1a699a3 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -410,7 +410,7 @@ static u32 get_current_settings(struct hci_dev *hdev)
         if (hdev->host_features[0] & LMP_HOST_LE)
                 settings |= MGMT_SETTING_LE;
 
-        if (test_bit(HCI_AUTH, &hdev->flags))
+        if (test_bit(HCI_LINK_SECURITY, &hdev->dev_flags))
                 settings |= MGMT_SETTING_LINK_SECURITY;
 
         if (test_bit(HCI_SSP_ENABLED, &hdev->dev_flags))
@@ -1067,8 +1067,21 @@ static int set_link_security(struct sock *sk, u16 index, void *data, u16 len)
         hci_dev_lock(hdev);
 
         if (!hdev_is_powered(hdev)) {
-                err = cmd_status(sk, index, MGMT_OP_SET_LINK_SECURITY,
-                                                MGMT_STATUS_NOT_POWERED);
+                bool changed = false;
+
+                if (!!cp->val != test_bit(HCI_LINK_SECURITY,
+                                                        &hdev->dev_flags)) {
+                        change_bit(HCI_LINK_SECURITY, &hdev->dev_flags);
+                        changed = true;
+                }
+
+                err = send_settings_rsp(sk, MGMT_OP_SET_LINK_SECURITY, hdev);
+                if (err < 0)
+                        goto failed;
+
+                if (changed)
+                        err = new_settings(hdev, sk);
+
                 goto failed;
         }
 
@@ -3338,7 +3351,8 @@ int mgmt_auth_failed(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 int mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)
 {
         struct cmd_lookup match = { NULL, hdev };
-        int err;
+        bool changed = false;
+        int err = 0;
 
         if (status) {
                 u8 mgmt_err = mgmt_status(status);
@@ -3347,10 +3361,19 @@ int mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)
                 return 0;
         }
 
+        if (test_bit(HCI_AUTH, &hdev->flags)) {
+                if (!test_and_set_bit(HCI_LINK_SECURITY, &hdev->dev_flags))
+                        changed = true;
+        } else {
+                if (test_and_clear_bit(HCI_LINK_SECURITY, &hdev->dev_flags))
+                        changed = true;
+        }
+
         mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, settings_rsp,
                                                                 &match);
 
-        err = new_settings(hdev, match.sk);
+        if (changed)
+                err = new_settings(hdev, match.sk);
 
         if (match.sk)
                 sock_put(match.sk);