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Date: Sun, 21 Nov 2021 11:12:18 -0800
From: Manish Mandlik <mmandlik@...gle.com>
To: marcel@...tmann.org, luiz.dentz@...il.com
Cc: linux-bluetooth@...r.kernel.org,
chromeos-bluetooth-upstreaming@...omium.org,
Manish Mandlik <mmandlik@...gle.com>,
Miao-chen Chou <mcchou@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Johan Hedberg <johan.hedberg@...il.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v6 2/2] bluetooth: Add MGMT Adv Monitor Device Found/Lost events
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@...gle.com>
Reviewed-by: Miao-chen Chou <mcchou@...gle.com>
---
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 | 100 ++++++++++++++++++++++++++++++-
net/bluetooth/msft.c | 15 ++++-
4 files changed, 132 insertions(+), 2 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 6734b394c6e7..2aabd6f62f51 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -598,6 +598,7 @@ 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;
@@ -1844,6 +1845,8 @@ 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 23a0524061b7..4b85f93b8a77 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -1103,3 +1103,19 @@ 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 f8f74d344297..01f74e4feb97 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[] = {
@@ -9524,6 +9526,78 @@ 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,
+ struct mgmt_ev_device_found *ev,
+ size_t ev_size, bool discovering)
+{
+ char buf[518];
+ struct mgmt_ev_adv_monitor_device_found *advmon_ev = (void *)buf;
+ size_t advmon_ev_size;
+ struct monitored_device *dev, *tmp;
+ bool matched = false;
+ bool notified = false;
+
+ /* Make sure that the buffer is big enough */
+ advmon_ev_size = ev_size + (sizeof(*advmon_ev) - sizeof(*ev));
+ if (advmon_ev_size > sizeof(buf))
+ 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.
+ */
+ memcpy(&advmon_ev->addr, ev, ev_size);
+
+ hdev->advmon_pend_notify = false;
+
+ list_for_each_entry_safe(dev, tmp, &hdev->monitored_devices, list) {
+ if (!bacmp(&dev->bdaddr, &advmon_ev->addr.bdaddr)) {
+ matched = true;
+
+ if (!dev->notified) {
+ advmon_ev->monitor_handle =
+ cpu_to_le16(dev->handle);
+
+ mgmt_event(MGMT_EV_ADV_MONITOR_DEVICE_FOUND,
+ hdev, advmon_ev, advmon_ev_size,
+ NULL);
+
+ notified = true;
+ dev->notified = true;
+ }
+ }
+
+ if (!dev->notified)
+ hdev->advmon_pend_notify = true;
+ }
+
+ if (!discovering &&
+ ((matched && !notified) || !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.
+ */
+ advmon_ev->monitor_handle = 0;
+
+ mgmt_event(MGMT_EV_ADV_MONITOR_DEVICE_FOUND, hdev, advmon_ev,
+ advmon_ev_size, NULL);
+ }
+}
+
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)
@@ -9606,7 +9680,31 @@ 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);
ev_size = sizeof(*ev) + eir_len + scan_rsp_len;
- mgmt_event(MGMT_EV_DEVICE_FOUND, hdev, ev, ev_size, NULL);
+ /* 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 (hci_discovery_active(hdev) ||
+ (link_type == LE_LINK && !list_empty(&hdev->pend_le_reports))) {
+ mgmt_event(MGMT_EV_DEVICE_FOUND, hdev, ev, ev_size, NULL);
+
+ if (hdev->advmon_pend_notify)
+ mgmt_adv_monitor_device_found(hdev, ev, ev_size, true);
+ } else {
+ mgmt_adv_monitor_device_found(hdev, ev, ev_size, false);
+ }
}
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 aadabe78baf6..3e2385562d2b 100644
--- a/net/bluetooth/msft.c
+++ b/net/bluetooth/msft.c
@@ -579,8 +579,16 @@ void msft_do_close(struct hci_dev *hdev)
hci_dev_lock(hdev);
- /* Clear any devices that are being monitored */
+ /* Clear any devices that are being monitored and notify device lost */
+
+ hdev->advmon_pend_notify = false;
+
list_for_each_entry_safe(dev, tmp_dev, &hdev->monitored_devices, list) {
+ if (dev->notified)
+ mgmt_adv_monitor_device_lost(hdev, dev->handle,
+ &dev->bdaddr,
+ dev->addr_type);
+
list_del(&dev->list);
kfree(dev);
}
@@ -639,6 +647,7 @@ 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 */
@@ -649,6 +658,10 @@ static void msft_device_lost(struct hci_dev *hdev, bdaddr_t *bdaddr,
list_for_each_entry_safe(dev, tmp, &hdev->monitored_devices, list) {
if (dev->handle == mgmt_handle) {
+ if (dev->notified)
+ mgmt_adv_monitor_device_lost(hdev, mgmt_handle,
+ bdaddr, addr_type);
+
list_del(&dev->list);
kfree(dev);
--
2.34.0.rc2.393.gf8c9666880-goog
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