Bluetooth: Add support for controller configuration info command

The Read Controller Configuration Information command allows retrieving
details about possible configurations option. The supported options are
returned and also the missing options (if any).
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/mgmt.h

@@ -97,6 +97,7 @@ struct mgmt_rp_read_index_list {
 #define MGMT_SETTING_SECURE_CONN	0x00000800
 #define MGMT_SETTING_DEBUG_KEYS		0x00001000
 #define MGMT_SETTING_PRIVACY		0x00002000
+#define MGMT_SETTING_CONFIGURATION	0x00004000
 
 #define MGMT_OP_READ_INFO		0x0004
 #define MGMT_READ_INFO_SIZE		0
@@ -471,6 +472,16 @@ struct mgmt_rp_read_unconf_index_list {
 	__le16	index[0];
 } __packed;
 
+#define MGMT_OPTION_PUBLIC_ADDRESS	0x00000001
+
+#define MGMT_OP_READ_CONFIG_INFO	0x0037
+#define MGMT_READ_CONFIG_INFO_SIZE	0
+struct mgmt_rp_read_config_info {
+	__le16	manufacturer;
+	__le32	supported_options;
+	__le32	missing_options;
+} __packed;
+
 #define MGMT_EV_CMD_COMPLETE		0x0001
 struct mgmt_ev_cmd_complete {
 	__le16	opcode;

net/bluetooth/mgmt.c

@@ -90,6 +90,7 @@ static const u16 mgmt_commands[] = {
 	MGMT_OP_REMOVE_DEVICE,
 	MGMT_OP_LOAD_CONN_PARAM,
 	MGMT_OP_READ_UNCONF_INDEX_LIST,
+	MGMT_OP_READ_CONFIG_INFO,
 };
 
 static const u16 mgmt_events[] = {
@@ -440,6 +441,29 @@ static int read_unconf_index_list(struct sock *sk, struct hci_dev *hdev,
 	return err;
 }
 
+static int read_config_info(struct sock *sk, struct hci_dev *hdev,
+			    void *data, u16 data_len)
+{
+	struct mgmt_rp_read_config_info rp;
+
+	BT_DBG("sock %p %s", sk, hdev->name);
+
+	hci_dev_lock(hdev);
+
+	memset(&rp, 0, sizeof(rp));
+	rp.manufacturer = cpu_to_le16(hdev->manufacturer);
+	if (hdev->set_bdaddr)
+		rp.supported_options = cpu_to_le32(MGMT_OPTION_PUBLIC_ADDRESS);
+	else
+		rp.supported_options = cpu_to_le32(0);
+	rp.missing_options = cpu_to_le32(0);
+
+	hci_dev_unlock(hdev);
+
+	return cmd_complete(sk, hdev->id, MGMT_OP_READ_CONFIG_INFO, 0, &rp,
+			    sizeof(rp));
+}
+
 static u32 get_supported_settings(struct hci_dev *hdev)
 {
 	u32 settings = 0;
@@ -472,6 +496,9 @@ static u32 get_supported_settings(struct hci_dev *hdev)
 		settings |= MGMT_SETTING_PRIVACY;
 	}
 
+	if (hdev->set_bdaddr)
+		settings |= MGMT_SETTING_CONFIGURATION;
+
 	return settings;
 }
 
@@ -5371,6 +5398,7 @@ static const struct mgmt_handler {
 	{ remove_device,          false, MGMT_REMOVE_DEVICE_SIZE },
 	{ load_conn_param,        true,  MGMT_LOAD_CONN_PARAM_SIZE },
 	{ read_unconf_index_list, false, MGMT_READ_UNCONF_INDEX_LIST_SIZE },
+	{ read_config_info,       false, MGMT_READ_CONFIG_INFO_SIZE },
 };
 
 int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)