diff mbox series

[v2,1/2] Bluetooth: Introduce HCI_CONN_FLAG_DEVICE_PRIVACY device flag

Message ID 20211118231302.1000168-1-luiz.dentz@gmail.com
State New
Headers show
Series [v2,1/2] Bluetooth: Introduce HCI_CONN_FLAG_DEVICE_PRIVACY device flag | expand

Commit Message

Luiz Augusto von Dentz Nov. 18, 2021, 11:13 p.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This introduces HCI_CONN_FLAG_DEVICE_PRIVACY which can be used by
userspace to indicate to the controller to use Device Privacy Mode to a
specific device.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
v2: Fix supported flags not actually checking if the hdev really
supports the flags.

 include/net/bluetooth/hci_core.h |  4 ++++
 net/bluetooth/mgmt.c             | 30 ++++++++++++++++++++++++++----
 2 files changed, 30 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 2560cfe80db8..42ba40df6e20 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -160,6 +160,7 @@  struct bdaddr_list_with_flags {
 
 enum hci_conn_flags {
 	HCI_CONN_FLAG_REMOTE_WAKEUP,
+	HCI_CONN_FLAG_DEVICE_PRIVACY,
 	HCI_CONN_FLAG_MAX
 };
 
@@ -1465,6 +1466,9 @@  void hci_conn_del_sysfs(struct hci_conn *conn);
 #define use_ll_privacy(dev) (ll_privacy_capable(dev) && \
 			     hci_dev_test_flag(dev, HCI_ENABLE_LL_PRIVACY))
 
+#define privacy_mode_capable(dev) (use_ll_privacy(dev) && \
+				   (hdev->commands[39] & 0x04))
+
 /* Use enhanced synchronous connection if command is supported */
 #define enhanced_sco_capable(dev) ((dev)->commands[29] & 0x08)
 
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index f8f74d344297..d82d1a62754a 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -4349,7 +4349,22 @@  static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
 			       MGMT_STATUS_NOT_SUPPORTED);
 }
 
-#define SUPPORTED_DEVICE_FLAGS() ((1U << HCI_CONN_FLAG_MAX) - 1)
+static u32 supported_device_flags(struct hci_dev *hdev)
+{
+	u32 flags = 0;
+
+	/* Check if adapter can wakeup the system */
+	if (hdev->wakeup && hdev->wakeup(hdev))
+		flags |= BIT(HCI_CONN_FLAG_REMOTE_WAKEUP);
+
+	/* Check if Privacy Mode can be set */
+	if (privacy_mode_capable(hdev))
+		flags |= BIT(HCI_CONN_FLAG_DEVICE_PRIVACY);
+
+	bt_dev_err(hdev, "flag 0x%8x", flags);
+
+	return flags;
+}
 
 static int get_device_flags(struct sock *sk, struct hci_dev *hdev, void *data,
 			    u16 data_len)
@@ -4358,7 +4373,7 @@  static int get_device_flags(struct sock *sk, struct hci_dev *hdev, void *data,
 	struct mgmt_rp_get_device_flags rp;
 	struct bdaddr_list_with_flags *br_params;
 	struct hci_conn_params *params;
-	u32 supported_flags = SUPPORTED_DEVICE_FLAGS();
+	u32 supported_flags = supported_device_flags(hdev);
 	u32 current_flags = 0;
 	u8 status = MGMT_STATUS_INVALID_PARAMS;
 
@@ -4422,7 +4437,7 @@  static int set_device_flags(struct sock *sk, struct hci_dev *hdev, void *data,
 	struct bdaddr_list_with_flags *br_params;
 	struct hci_conn_params *params;
 	u8 status = MGMT_STATUS_INVALID_PARAMS;
-	u32 supported_flags = SUPPORTED_DEVICE_FLAGS();
+	u32 supported_flags = supported_device_flags(hdev);
 	u32 current_flags = __le32_to_cpu(cp->current_flags);
 
 	bt_dev_dbg(hdev, "Set device flags %pMR (type 0x%x) = 0x%x",
@@ -4455,6 +4470,13 @@  static int set_device_flags(struct sock *sk, struct hci_dev *hdev, void *data,
 		if (params) {
 			params->current_flags = current_flags;
 			status = MGMT_STATUS_SUCCESS;
+
+			/* Update passive scan if HCI_CONN_FLAG_DEVICE_PRIVACY
+			 * has been set.
+			 */
+			if (hci_conn_test_flag(HCI_CONN_FLAG_DEVICE_PRIVACY,
+					       params->current_flags))
+				hci_update_passive_scan(hdev);
 		} else {
 			bt_dev_warn(hdev, "No such LE device %pMR (0x%x)",
 				    &cp->addr.bdaddr,
@@ -7060,7 +7082,7 @@  static int add_device(struct sock *sk, struct hci_dev *hdev,
 added:
 	device_added(sk, hdev, &cp->addr.bdaddr, cp->addr.type, cp->action);
 	device_flags_changed(NULL, hdev, &cp->addr.bdaddr, cp->addr.type,
-			     SUPPORTED_DEVICE_FLAGS(), current_flags);
+			     supported_device_flags(hdev), current_flags);
 
 	err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_ADD_DEVICE,
 				MGMT_STATUS_SUCCESS, &cp->addr,