Commit 7a5f4990 authored by Marcel Holtmann's avatar Marcel Holtmann Committed by Johan Hedberg
Browse files

Bluetooth: Store device name in scan response data 



The scan response data is a better place to store the device name
since it has more space available and is also enforcing privacy.

When the controller is advertising, the connectable setting decides
if ADV_IND or ADV_NONCONN_IND is used. In case of ADV_IND, the
remote side is allowed to request the scan response data. Same as
with BR/EDR where either EIR is used or a remote name request. In
non-connectable mode, the device name is not available since it is
not allowed to request scan response data. Same as in BR/EDR where
the device is non-discoverable and no name requests are answered.

Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarJohan Hedberg <johan.hedberg@intel.com>
parent f14d8f64

net/bluetooth/mgmt.c

+26 −21
Original line number Diff line number Diff line
@@ -538,7 +538,28 @@ static u8 *create_uuid128_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len) 


static u8 create_scan_rsp_data(struct hci_dev *hdev, u8 *ptr)

{

	return 0;

	u8 ad_len = 0;

	size_t name_len;



	name_len = strlen(hdev->dev_name);

	if (name_len > 0) {

		size_t max_len = HCI_MAX_AD_LENGTH - ad_len - 2;



		if (name_len > max_len) {

			name_len = max_len;

			ptr[1] = EIR_NAME_SHORT;

		} else

			ptr[1] = EIR_NAME_COMPLETE;



		ptr[0] = name_len + 1;



		memcpy(ptr + 2, hdev->dev_name, name_len);



		ad_len += (name_len + 2);

		ptr += (name_len + 2);

	}



	return ad_len;

}



static void update_scan_rsp_data(struct hci_request *req)
@@ -569,7 +590,6 @@ static void update_scan_rsp_data(struct hci_request *req) 
static u8 create_adv_data(struct hci_dev *hdev, u8 *ptr)

{

	u8 ad_len = 0, flags = 0;

	size_t name_len;



	if (test_bit(HCI_ADVERTISING, &hdev->dev_flags))

		flags |= LE_AD_GENERAL;
@@ -603,24 +623,6 @@ static u8 create_adv_data(struct hci_dev *hdev, u8 *ptr) 
		ptr += 3;

	}



	name_len = strlen(hdev->dev_name);

	if (name_len > 0) {

		size_t max_len = HCI_MAX_AD_LENGTH - ad_len - 2;



		if (name_len > max_len) {

			name_len = max_len;

			ptr[1] = EIR_NAME_SHORT;

		} else

			ptr[1] = EIR_NAME_COMPLETE;



		ptr[0] = name_len + 1;



		memcpy(ptr + 2, hdev->dev_name, name_len);



		ad_len += (name_len + 2);

		ptr += (name_len + 2);

	}



	return ad_len;

}
@@ -2966,8 +2968,11 @@ static int set_local_name(struct sock *sk, struct hci_dev *hdev, void *data, 
		update_eir(&req);

	}



	/* The name is stored in the scan response data and so

	 * no need to udpate the advertising data here.

	 */

	if (lmp_le_capable(hdev))

		update_ad(&req);

		update_scan_rsp_data(&req);



	err = hci_req_run(&req, set_name_complete);

	if (err < 0)

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