Bluetooth: Add helper to set adv data

We wish to handle advertising data separately from advertising
parameters in our new MGMT requests. This change adds a helper that
allows the advertising data and scan response to be updated for an
existing advertising instance.
Reviewed-by: NSonny Sasaka <sonnysasaka@chromium.org>
Signed-off-by: NDaniel Winkler <danielwinkler@google.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/hci_core.h

@@ -1302,6 +1302,9 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
 			 u16 adv_data_len, u8 *adv_data,
 			 u16 scan_rsp_len, u8 *scan_rsp_data,
 			 u16 timeout, u16 duration);
+int hci_set_adv_instance_data(struct hci_dev *hdev, u8 instance,
+			 u16 adv_data_len, u8 *adv_data,
+			 u16 scan_rsp_len, u8 *scan_rsp_data);
 int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance);
 void hci_adv_instances_set_rpa_expired(struct hci_dev *hdev, bool rpa_expired);
 

net/bluetooth/hci_core.c

@@ -3005,6 +3005,37 @@ int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
 	return 0;
 }
 
+/* This function requires the caller holds hdev->lock */
+int hci_set_adv_instance_data(struct hci_dev *hdev, u8 instance,
+			      u16 adv_data_len, u8 *adv_data,
+			      u16 scan_rsp_len, u8 *scan_rsp_data)
+{
+	struct adv_info *adv_instance;
+
+	adv_instance = hci_find_adv_instance(hdev, instance);
+
+	/* If advertisement doesn't exist, we can't modify its data */
+	if (!adv_instance)
+		return -ENOENT;
+
+	if (adv_data_len) {
+		memset(adv_instance->adv_data, 0,
+		       sizeof(adv_instance->adv_data));
+		memcpy(adv_instance->adv_data, adv_data, adv_data_len);
+		adv_instance->adv_data_len = adv_data_len;
+	}
+
+	if (scan_rsp_len) {
+		memset(adv_instance->scan_rsp_data, 0,
+		       sizeof(adv_instance->scan_rsp_data));
+		memcpy(adv_instance->scan_rsp_data,
+		       scan_rsp_data, scan_rsp_len);
+		adv_instance->scan_rsp_len = scan_rsp_len;
+	}
+
+	return 0;
+}
+
 /* This function requires the caller holds hdev->lock */
 void hci_adv_monitors_clear(struct hci_dev *hdev)
 {