[PATCH v10 2/2] bluetooth: mgmt: Add MGMT Adv Monitor Device Found/Lost events
From: Manish Mandlik
Date: Tue Jan 11 2022 - 11:14:44 EST
This patch introduces two new MGMT events for notifying the bluetoothd
whenever the controller starts/stops monitoring a device.
Test performed:
- Verified by logs that the MSFT Monitor Device is received from the
controller and the bluetoothd is notified whenever the controller
starts/stops monitoring a device.
Signed-off-by: Manish Mandlik <mmandlik@xxxxxxxxxx>
Reviewed-by: Miao-chen Chou <mcchou@xxxxxxxxxx>
---
Changes in v10:
- Update code to use monitor device delete helper function.
Changes in v8:
- Refactor mgmt_adv_monitor_device_found() to make use of
skb_put/skb_put_data.
Changes in v7:
- Refactor mgmt_device_found() to fix stack frame size limit
Changes in v6:
- Fix compiler warning for mgmt_adv_monitor_device_found().
Changes in v5:
- New patch in the series. Split previous patch into two.
- Update the Device Found logic to send existing Device Found event or
Adv Monitor Device Found event depending on the active scanning state.
include/net/bluetooth/hci_core.h | 3 +
include/net/bluetooth/mgmt.h | 16 +++++
net/bluetooth/mgmt.c | 115 +++++++++++++++++++++++++++++--
net/bluetooth/msft.c | 20 ++++--
4 files changed, 144 insertions(+), 10 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 639fb9f57ae7..21eadb113a31 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -601,6 +601,7 @@ struct hci_dev {
struct delayed_work interleave_scan;
struct list_head monitored_devices;
+ bool advmon_pend_notify;
#if IS_ENABLED(CONFIG_BT_LEDS)
struct led_trigger *power_led;
@@ -1858,6 +1859,8 @@ void mgmt_adv_monitor_removed(struct hci_dev *hdev, u16 handle);
int mgmt_phy_configuration_changed(struct hci_dev *hdev, struct sock *skip);
int mgmt_add_adv_patterns_monitor_complete(struct hci_dev *hdev, u8 status);
int mgmt_remove_adv_monitor_complete(struct hci_dev *hdev, u8 status);
+void mgmt_adv_monitor_device_lost(struct hci_dev *hdev, u16 handle,
+ bdaddr_t *bdaddr, u8 addr_type);
u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
u16 to_multiplier);
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 107b25deae68..99266f7aebdc 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -1104,3 +1104,19 @@ struct mgmt_ev_controller_resume {
#define MGMT_WAKE_REASON_NON_BT_WAKE 0x0
#define MGMT_WAKE_REASON_UNEXPECTED 0x1
#define MGMT_WAKE_REASON_REMOTE_WAKE 0x2
+
+#define MGMT_EV_ADV_MONITOR_DEVICE_FOUND 0x002f
+struct mgmt_ev_adv_monitor_device_found {
+ __le16 monitor_handle;
+ struct mgmt_addr_info addr;
+ __s8 rssi;
+ __le32 flags;
+ __le16 eir_len;
+ __u8 eir[0];
+} __packed;
+
+#define MGMT_EV_ADV_MONITOR_DEVICE_LOST 0x0030
+struct mgmt_ev_adv_monitor_device_lost {
+ __le16 monitor_handle;
+ struct mgmt_addr_info addr;
+} __packed;
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 37087cf7dc5a..08d6494f1b34 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -174,6 +174,8 @@ static const u16 mgmt_events[] = {
MGMT_EV_ADV_MONITOR_REMOVED,
MGMT_EV_CONTROLLER_SUSPEND,
MGMT_EV_CONTROLLER_RESUME,
+ MGMT_EV_ADV_MONITOR_DEVICE_FOUND,
+ MGMT_EV_ADV_MONITOR_DEVICE_LOST,
};
static const u16 mgmt_untrusted_commands[] = {
@@ -9589,12 +9591,116 @@ static bool is_filter_match(struct hci_dev *hdev, s8 rssi, u8 *eir,
return true;
}
+void mgmt_adv_monitor_device_lost(struct hci_dev *hdev, u16 handle,
+ bdaddr_t *bdaddr, u8 addr_type)
+{
+ struct mgmt_ev_adv_monitor_device_lost ev;
+
+ ev.monitor_handle = cpu_to_le16(handle);
+ bacpy(&ev.addr.bdaddr, bdaddr);
+ ev.addr.type = addr_type;
+
+ mgmt_event(MGMT_EV_ADV_MONITOR_DEVICE_LOST, hdev, &ev, sizeof(ev),
+ NULL);
+}
+
+static void mgmt_adv_monitor_device_found(struct hci_dev *hdev,
+ bdaddr_t *bdaddr, bool report_device,
+ struct sk_buff *skb,
+ struct sock *skip_sk)
+{
+ struct sk_buff *advmon_skb;
+ size_t advmon_skb_len;
+ __le16 *monitor_handle;
+ struct monitored_device *dev, *tmp;
+ bool matched = false;
+ bool notify = false;
+
+ /* We have received the Advertisement Report because:
+ * 1. the kernel has initiated active discovery
+ * 2. if not, we have pend_le_reports > 0 in which case we are doing
+ * passive scanning
+ * 3. if none of the above is true, we have one or more active
+ * Advertisement Monitor
+ *
+ * For case 1 and 2, report all advertisements via MGMT_EV_DEVICE_FOUND
+ * and report ONLY one advertisement per device for the matched Monitor
+ * via MGMT_EV_ADV_MONITOR_DEVICE_FOUND event.
+ *
+ * For case 3, since we are not active scanning and all advertisements
+ * received are due to a matched Advertisement Monitor, report all
+ * advertisements ONLY via MGMT_EV_ADV_MONITOR_DEVICE_FOUND event.
+ */
+ if (report_device && !hdev->advmon_pend_notify) {
+ mgmt_event_skb(skb, skip_sk);
+ return;
+ }
+
+ advmon_skb_len = (sizeof(struct mgmt_ev_adv_monitor_device_found) -
+ sizeof(struct mgmt_ev_device_found)) + skb->len;
+ advmon_skb = mgmt_alloc_skb(hdev, MGMT_EV_ADV_MONITOR_DEVICE_FOUND,
+ advmon_skb_len);
+ if (!advmon_skb) {
+ if (report_device)
+ mgmt_event_skb(skb, skip_sk);
+ else
+ kfree_skb(skb);
+ return;
+ }
+
+ /* ADV_MONITOR_DEVICE_FOUND is similar to DEVICE_FOUND event except
+ * that it also has 'monitor_handle'. Make a copy of DEVICE_FOUND and
+ * store monitor_handle of the matched monitor.
+ */
+ monitor_handle = skb_put(advmon_skb, sizeof(*monitor_handle));
+ skb_put_data(advmon_skb, skb->data, skb->len);
+
+ hdev->advmon_pend_notify = false;
+
+ list_for_each_entry_safe(dev, tmp, &hdev->monitored_devices, list) {
+ if (!bacmp(&dev->bdaddr, bdaddr)) {
+ matched = true;
+
+ if (!dev->notified) {
+ *monitor_handle = cpu_to_le16(dev->handle);
+ notify = true;
+ dev->notified = true;
+ }
+ }
+
+ if (!dev->notified)
+ hdev->advmon_pend_notify = true;
+ }
+
+ if (!report_device &&
+ ((matched && !notify) || !msft_monitor_supported(hdev))) {
+ /* Handle 0 indicates that we are not active scanning and this
+ * is a subsequent advertisement report for an already matched
+ * Advertisement Monitor or the controller offloading support
+ * is not available.
+ */
+ *monitor_handle = 0;
+ notify = true;
+ }
+
+ if (report_device)
+ mgmt_event_skb(skb, skip_sk);
+ else
+ kfree_skb(skb);
+
+ if (notify)
+ mgmt_event_skb(advmon_skb, skip_sk);
+ else
+ kfree_skb(advmon_skb);
+}
+
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)
{
struct sk_buff *skb;
struct mgmt_ev_device_found *ev;
+ bool report_device = hci_discovery_active(hdev);
/* Don't send events for a non-kernel initiated discovery. With
* LE one exception is if we have pend_le_reports > 0 in which
@@ -9603,11 +9709,10 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
if (!hci_discovery_active(hdev)) {
if (link_type == ACL_LINK)
return;
- if (link_type == LE_LINK &&
- list_empty(&hdev->pend_le_reports) &&
- !hci_is_adv_monitoring(hdev)) {
+ if (link_type == LE_LINK && !list_empty(&hdev->pend_le_reports))
+ report_device = true;
+ else if (!hci_is_adv_monitoring(hdev))
return;
- }
}
if (hdev->discovery.result_filtering) {
@@ -9672,7 +9777,7 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
ev->eir_len = cpu_to_le16(eir_len + scan_rsp_len);
- mgmt_event_skb(skb, NULL);
+ mgmt_adv_monitor_device_found(hdev, bdaddr, report_device, skb, NULL);
}
void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
index 213eab2f085a..484540855863 100644
--- a/net/bluetooth/msft.c
+++ b/net/bluetooth/msft.c
@@ -214,7 +214,8 @@ static struct msft_monitor_advertisement_handle_data *msft_find_handle_data
/* This function requires the caller holds hdev->lock */
static int msft_monitor_device_del(struct hci_dev *hdev, __u16 mgmt_handle,
- bdaddr_t *bdaddr, __u8 addr_type)
+ bdaddr_t *bdaddr, __u8 addr_type,
+ bool notify)
{
struct monitored_device *dev, *tmp;
int count = 0;
@@ -227,6 +228,12 @@ static int msft_monitor_device_del(struct hci_dev *hdev, __u16 mgmt_handle,
if ((!mgmt_handle || dev->handle == mgmt_handle) &&
(!bdaddr || (!bacmp(bdaddr, &dev->bdaddr) &&
addr_type == dev->addr_type))) {
+ if (notify && dev->notified) {
+ mgmt_adv_monitor_device_lost(hdev, dev->handle,
+ &dev->bdaddr,
+ dev->addr_type);
+ }
+
list_del(&dev->list);
kfree(dev);
count++;
@@ -328,7 +335,7 @@ static void msft_le_cancel_monitor_advertisement_cb(struct hci_dev *hdev,
/* Clear any monitored devices by this Adv Monitor */
msft_monitor_device_del(hdev, handle_data->mgmt_handle, NULL,
- 0);
+ 0, false);
list_del(&handle_data->list);
kfree(handle_data);
@@ -596,8 +603,9 @@ void msft_do_close(struct hci_dev *hdev)
hci_dev_lock(hdev);
- /* Clear any devices that are being monitored */
- msft_monitor_device_del(hdev, 0, NULL, 0);
+ /* Clear any devices that are being monitored and notify device lost */
+ hdev->advmon_pend_notify = false;
+ msft_monitor_device_del(hdev, 0, NULL, 0, true);
hci_dev_unlock(hdev);
}
@@ -653,13 +661,15 @@ static void msft_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr,
INIT_LIST_HEAD(&dev->list);
list_add(&dev->list, &hdev->monitored_devices);
+ hdev->advmon_pend_notify = true;
}
/* This function requires the caller holds hdev->lock */
static void msft_device_lost(struct hci_dev *hdev, bdaddr_t *bdaddr,
__u8 addr_type, __u16 mgmt_handle)
{
- if (!msft_monitor_device_del(hdev, mgmt_handle, bdaddr, addr_type)) {
+ if (!msft_monitor_device_del(hdev, mgmt_handle, bdaddr, addr_type,
+ true)) {
bt_dev_err(hdev, "MSFT vendor event %u: dev %pMR not in list",
MSFT_EV_LE_MONITOR_DEVICE, bdaddr);
}
--
2.34.1.575.g55b058a8bb-goog