[PATCH v4 4/7] Bluetooth: Add handler of MGMT_OP_REMOVE_ADV_MONITOR

[Miao-chen Chou]

This adds the request handler of MGMT_OP_REMOVE_ADV_MONITOR command.
Note that the controller-based monitoring is not yet in place. This
removes the internal monitor(s) without sending HCI traffic, so the
request returns immediately.

The following test was performed.
- Issue btmgmt advmon-remove with valid and invalid handles.

Signed-off-by: Miao-chen Chou <mcc...@chromium.org>
---

Changes in v4:
- Fix warnings.

Changes in v3:
- Update the opcode in the mgmt table.
- Convert the endianness of the returned handle.

Changes in v2: None

 include/net/bluetooth/hci_core.h |  1 +
 net/bluetooth/hci_core.c         | 31 +++++++++++++++++++++++++++++++
 net/bluetooth/mgmt.c             | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 862d94f711bc0..78ac7fd282d77 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1242,6 +1242,7 @@ void hci_adv_instances_set_rpa_expired(struct hci_dev 
*hdev, bool rpa_expired);
 void hci_adv_monitors_clear(struct hci_dev *hdev);
 void hci_free_adv_monitor(struct adv_monitor *monitor);
 int hci_add_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor);
+int hci_remove_adv_monitor(struct hci_dev *hdev, u16 handle);
 
 void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);
 
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index fdbb58eb2fb22..d0f30e2e29471 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3041,6 +3041,37 @@ int hci_add_adv_monitor(struct hci_dev *hdev, struct 
adv_monitor *monitor)
        return 0;
 }
 
+static int free_adv_monitor(int id, void *ptr, void *data)
+{
+       struct hci_dev *hdev = data;
+       struct adv_monitor *monitor = ptr;
+
+       idr_remove(&hdev->adv_monitors_idr, monitor->handle);
+       hci_free_adv_monitor(monitor);
+
+       return 0;
+}
+
+/* This function requires the caller holds hdev->lock */
+int hci_remove_adv_monitor(struct hci_dev *hdev, u16 handle)
+{
+       struct adv_monitor *monitor;
+
+       if (handle) {
+               monitor = idr_find(&hdev->adv_monitors_idr, handle);
+               if (!monitor)
+                       return -ENOENT;
+
+               idr_remove(&hdev->adv_monitors_idr, monitor->handle);
+               hci_free_adv_monitor(monitor);
+       } else {
+               /* Remove all monitors if handle is 0. */
+               idr_for_each(&hdev->adv_monitors_idr, &free_adv_monitor, hdev);
+       }
+
+       return 0;
+}
+
 struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *bdaddr_list,
                                         bdaddr_t *bdaddr, u8 type)
 {
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 8e0d4ccf81f15..887e193ce0038 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -114,6 +114,7 @@ static const u16 mgmt_commands[] = {
        MGMT_OP_SET_EXP_FEATURE,
        MGMT_OP_READ_ADV_MONITOR_FEATURES,
        MGMT_OP_ADD_ADV_PATTERNS_MONITOR,
+       MGMT_OP_REMOVE_ADV_MONITOR,
 };
 
 static const u16 mgmt_events[] = {
@@ -3994,6 +3995,36 @@ static int add_adv_patterns_monitor(struct sock *sk, 
struct hci_dev *hdev,
        return err;
 }
 
+static int remove_adv_monitor(struct sock *sk, struct hci_dev *hdev,
+                             void *data, u16 len)
+{
+       struct mgmt_cp_remove_adv_monitor *cp = data;
+       struct mgmt_rp_remove_adv_monitor rp;
+       int err;
+
+       BT_DBG("request for %s", hdev->name);
+
+       hci_dev_lock(hdev);
+
+       err = hci_remove_adv_monitor(hdev, __le16_to_cpu(cp->monitor_handle));
+       if (err == -ENOENT) {
+               err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_REMOVE_ADV_MONITOR,
+                                     MGMT_STATUS_INVALID_INDEX);
+               goto unlock;
+       }
+
+       hci_dev_unlock(hdev);
+
+       rp.monitor_handle = cp->monitor_handle;
+
+       return mgmt_cmd_complete(sk, hdev->id, MGMT_OP_REMOVE_ADV_MONITOR,
+                                MGMT_STATUS_SUCCESS, &rp, sizeof(rp));
+
+unlock:
+       hci_dev_unlock(hdev);
+       return err;
+}
+
 static void read_local_oob_data_complete(struct hci_dev *hdev, u8 status,
                                         u16 opcode, struct sk_buff *skb)
 {
@@ -7451,6 +7482,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
        { read_adv_monitor_features, MGMT_READ_ADV_MONITOR_FEATURES_SIZE },
        { add_adv_patterns_monitor, MGMT_ADD_ADV_PATTERNS_MONITOR_SIZE,
                                                HCI_MGMT_VAR_LEN },
+       { remove_adv_monitor, MGMT_REMOVE_ADV_MONITOR_SIZE },
 };
 
 void mgmt_index_added(struct hci_dev *hdev)
-- 
2.26.2