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Bluetooth: Add framework for device found filtering based on UUID

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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>
This commit is contained in:
Marcel Holtmann 2014-12-05 10:55:57 +01:00 committed by Johan Hedberg
parent bda157a400
commit b487b9ce93
1 changed files with 52 additions and 2 deletions
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54
net/bluetooth/mgmt.c
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@ -6802,6 +6802,11 @@ void mgmt_read_local_oob_data_complete(struct hci_dev *hdev, u8 *hash192,
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 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
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 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
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;