Bluetooth: Add framework for device found filtering based on UUID
Using Start Service Discovery provides the option to specifiy a list
of UUID that are used to filter out device found events. This patch
provides the framework for hooking up the UUID filter.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 1715c91..e39190a 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -6802,6 +6802,11 @@
mgmt_pending_remove(cmd);
}
+static bool eir_has_uuids(u8 *eir, u16 eir_len, u16 uuid_count, u8 (*uuids)[16])
+{
+ return false;
+}
+
void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
u8 addr_type, u8 *dev_class, s8 rssi, u32 flags,
u8 *eir, u16 eir_len, u8 *scan_rsp, u8 scan_rsp_len)
@@ -6809,6 +6814,7 @@
char buf[512];
struct mgmt_ev_device_found *ev = (void *) buf;
size_t ev_size;
+ bool match;
/* Don't send events for a non-kernel initiated discovery. With
* LE one exception is if we have pend_le_reports > 0 in which
@@ -6843,15 +6849,59 @@
ev->rssi = rssi;
ev->flags = cpu_to_le32(flags);
- if (eir_len > 0)
+ 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 (!match)
+ return;
+ }
+
+ /* Copy EIR or advertising data into event */
memcpy(ev->eir, eir, eir_len);
+ } 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)
+ return;
+ }
if (dev_class && !eir_has_data_type(ev->eir, eir_len, EIR_CLASS_OF_DEV))
eir_len = eir_append_data(ev->eir, eir_len, EIR_CLASS_OF_DEV,
dev_class, 3);
- if (scan_rsp_len > 0)
+ 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;
+ }
+
+ /* Append scan response data to event */
memcpy(ev->eir + eir_len, scan_rsp, scan_rsp_len);
+ } 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 && !match)
+ return;
+ }
ev->eir_len = cpu_to_le16(eir_len + scan_rsp_len);
ev_size = sizeof(*ev) + eir_len + scan_rsp_len;