This patch refactor code responsible for filtering when service
discovery method is used. Previously this code was mixed with
mgmt_device found logic. Now when it's in one place whole logic can
be greatly simplified. That includes removing no longer necessary
length field and merging checks for eir and scan_rsp.
Signed-off-by: Jakub Pawlowski <jpawlowski@xxxxxxxxxx>
---
net/bluetooth/mgmt.c | 89 +++++++++++-----------------------------------------
1 file changed, 19 insertions(+), 70 deletions(-)
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index a41a5ef..bc09c5a 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -7283,8 +7283,6 @@ static void restart_le_scan(struct hci_dev *hdev)
static bool is_filter_match(struct hci_dev *hdev, s8 rssi, u8 *eir,
u16 eir_len, u8 *scan_rsp, u8 scan_rsp_len)
{
- bool match;
-
/* If a RSSI threshold has been specified, and
* HCI_QUIRK_STRICT_DUPLICATE_FILTER is not set, then all results with
* a RSSI smaller than the RSSI threshold will be dropped. If the quirk
@@ -7300,78 +7298,29 @@ static bool is_filter_match(struct hci_dev *hdev, s8 rssi, u8 *eir,
!test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks))))
return false;
-
- if (eir_len > 0) {
- /* When using service discovery and a list of UUID is
- * provided, results with no matching UUID should be
- * dropped. In case there is a match the result is
- * kept and checking possible scan response data
- * will be skipped.
- */
- if (hdev->discovery.uuid_count > 0) {
- match = eir_has_uuids(eir, eir_len,
- hdev->discovery.uuid_count,
- hdev->discovery.uuids);
- /* If duplicate filtering does not report RSSI changes,
- * then restart scanning to ensure updated result with
- * updated RSSI values.
- */
- if (match && test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER,
- &hdev->quirks))
- restart_le_scan(hdev);
- } else {
- match = true;
- }
-
- if (!match && !scan_rsp_len)
- return false;
- } else {
- /* When using service discovery and a list of UUID is
- * provided, results with empty EIR or advertising data
- * should be dropped since they do not match any UUID.
- */
- if (hdev->discovery.uuid_count > 0 && !scan_rsp_len)
- return false;
-
- match = false;
- }
-
- if (scan_rsp_len > 0) {
- /* When using service discovery and a list of UUID is
- * provided, results with no matching UUID should be
- * dropped if there is no previous match from the
- * advertising data.
- */
- if (hdev->discovery.uuid_count > 0) {
- if (!match && !eir_has_uuids(scan_rsp, scan_rsp_len,
- hdev->discovery.uuid_count,
- hdev->discovery.uuids))
- return false;
-
- /* If duplicate filtering does not report RSSI changes,
- * then restart scanning to ensure updated result with
- * updated RSSI values.
- */
- if (test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER,
- &hdev->quirks))
- restart_le_scan(hdev);
- }
- } else {
- /* When using service discovery and a list of UUID is
- * provided, results with empty scan response and no
- * previous matched advertising data should be dropped.
+ if (hdev->discovery.uuid_count != 0) {
+ /* If a list of UUIDs is provided in filter, results with no
+ * matching UUID should be dropped.
*/
- if (hdev->discovery.uuid_count > 0 && !match)
- return false;
+ if (!eir_has_uuids(eir, eir_len, hdev->discovery.uuid_count,
+ hdev->discovery.uuids) &&
+ !eir_has_uuids(scan_rsp, scan_rsp_len,
+ hdev->discovery.uuid_count,
+ hdev->discovery.uuids))
+ return false;
}
- /* Validate the reported RSSI value against the RSSI threshold once more
- * incase HCI_QUIRK_STRICT_DUPLICATE_FILTER forced a restart of LE
- * scanning.
+ /* If duplicate filtering does not report RSSI changes, then restart
+ * scanning to ensure updated result with updated RSSI values.
*/
- if (hdev->discovery.rssi != HCI_RSSI_INVALID &&
- rssi < hdev->discovery.rssi)
- return false;
+ if (test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks)) {
+ restart_le_scan(hdev);
+
+ /* Validate RSSI value against the RSSI threshold once more. */
+ if (hdev->discovery.rssi != HCI_RSSI_INVALID &&
+ rssi < hdev->discovery.rssi)
+ return false;
+ }
return true;
}
--
2.2.0.rc0.207.ga3a616c
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