Bluetooth: disable advertisement filters during suspend

This adds logic to disable and reenable advertisement filters during
suspend and resume. After this patch, we would only receive packets from
devices in allow list during suspend.

Signed-off-by: Howard Chung <howardchung@google.com>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index d29a44d77b4e..e55976db4403 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -29,6 +29,7 @@
 
 #include "smp.h"
 #include "hci_request.h"
+#include "msft.h"
 
 #define HCI_REQ_DONE	  0
 #define HCI_REQ_PEND	  1
@@ -1242,6 +1243,29 @@ static void suspend_req_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 		clear_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks);
 		wake_up(&hdev->suspend_wait_q);
 	}
+
+	if (test_bit(SUSPEND_SET_ADV_FILTER, hdev->suspend_tasks)) {
+		clear_bit(SUSPEND_SET_ADV_FILTER, hdev->suspend_tasks);
+		wake_up(&hdev->suspend_wait_q);
+	}
+}
+
+static void hci_req_add_set_adv_filter_enable(struct hci_request *req,
+					      bool enable)
+{
+	struct hci_dev *hdev = req->hdev;
+
+	switch (hci_get_adv_monitor_offload_ext(hdev)) {
+	case HCI_ADV_MONITOR_EXT_MSFT:
+		msft_req_add_set_filter_enable(req, enable);
+		break;
+	default:
+		return;
+	}
+
+	/* No need to block when enabling since it's on resume path */
+	if (hdev->suspended && !enable)
+		set_bit(SUSPEND_SET_ADV_FILTER, hdev->suspend_tasks);
 }
 
 /* Call with hci_dev_lock */
@@ -1301,6 +1325,9 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next)
 			hci_req_add_le_scan_disable(&req, false);
 		}
 
+		/* Disable advertisement filters */
+		hci_req_add_set_adv_filter_enable(&req, false);
+
 		/* Mark task needing completion */
 		set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks);
 
@@ -1340,6 +1367,8 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next)
 		hci_req_clear_event_filter(&req);
 		/* Reset passive/background scanning to normal */
 		__hci_update_background_scan(&req);
+		/* Enable all of the advertisement filters */
+		hci_req_add_set_adv_filter_enable(&req, true);
 
 		/* Unpause directed advertising */
 		hdev->advertising_paused = false;