Bluetooth: Add simple version of Read Local OOB Extended Data command

This adds support for the simplest possible version of Read Local OOB
Extended Data management command. It includes all mandatory fields,
but none of the actual pairing related ones.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/mgmt.h

@@ -506,6 +506,17 @@ struct mgmt_cp_start_service_discovery {
 } __packed;
 #define MGMT_START_SERVICE_DISCOVERY_SIZE 4
 
+#define MGMT_OP_READ_LOCAL_OOB_EXT_DATA	0x003B
+struct mgmt_cp_read_local_oob_ext_data {
+	__u8 type;
+} __packed;
+#define MGMT_READ_LOCAL_OOB_EXT_DATA_SIZE 1
+struct mgmt_rp_read_local_oob_ext_data {
+	__u8    type;
+	__le16	eir_len;
+	__u8	eir[0];
+} __packed;
+
 #define MGMT_OP_READ_EXT_INDEX_LIST	0x003C
 #define MGMT_READ_EXT_INDEX_LIST_SIZE	0
 struct mgmt_rp_read_ext_index_list {

net/bluetooth/mgmt.c

@@ -96,6 +96,7 @@ static const u16 mgmt_commands[] = {
 	MGMT_OP_SET_EXTERNAL_CONFIG,
 	MGMT_OP_SET_PUBLIC_ADDRESS,
 	MGMT_OP_START_SERVICE_DISCOVERY,
+	MGMT_OP_READ_LOCAL_OOB_EXT_DATA,
 	MGMT_OP_READ_EXT_INDEX_LIST,
 	MGMT_OP_READ_ADV_FEATURES,
 };
@@ -6266,6 +6267,114 @@ static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type, u8 *data,
 	return eir_len;
 }
 
+static int read_local_oob_ext_data(struct sock *sk, struct hci_dev *hdev,
+				   void *data, u16 data_len)
+{
+	struct mgmt_cp_read_local_oob_ext_data *cp = data;
+	struct mgmt_rp_read_local_oob_ext_data *rp;
+	size_t rp_len;
+	u16 eir_len;
+	u8 status, flags, role, addr[7];
+	int err;
+
+	BT_DBG("%s", hdev->name);
+
+	if (!hdev_is_powered(hdev))
+		return mgmt_cmd_complete(sk, hdev->id,
+					 MGMT_OP_READ_LOCAL_OOB_EXT_DATA,
+					 MGMT_STATUS_NOT_POWERED,
+					 &cp->type, sizeof(cp->type));
+
+	switch (cp->type) {
+	case BIT(BDADDR_BREDR):
+		status = mgmt_bredr_support(hdev);
+		if (status)
+			return mgmt_cmd_complete(sk, hdev->id,
+						 MGMT_OP_READ_LOCAL_OOB_EXT_DATA,
+						 status, &cp->type,
+						 sizeof(cp->type));
+		eir_len = 5;
+		break;
+	case (BIT(BDADDR_LE_PUBLIC) | BIT(BDADDR_LE_RANDOM)):
+		status = mgmt_le_support(hdev);
+		if (status)
+			return mgmt_cmd_complete(sk, hdev->id,
+						 MGMT_OP_READ_LOCAL_OOB_EXT_DATA,
+						 status, &cp->type,
+						 sizeof(cp->type));
+		eir_len = 15;
+		break;
+	default:
+		return mgmt_cmd_complete(sk, hdev->id,
+					 MGMT_OP_READ_LOCAL_OOB_EXT_DATA,
+					 MGMT_STATUS_INVALID_PARAMS,
+					 &cp->type, sizeof(cp->type));
+	}
+
+	hci_dev_lock(hdev);
+
+	rp_len = sizeof(*rp) + eir_len;
+	rp = kmalloc(rp_len, GFP_ATOMIC);
+	if (!rp) {
+		hci_dev_unlock(hdev);
+		return -ENOMEM;
+	}
+
+	eir_len = 0;
+	switch (cp->type) {
+	case BIT(BDADDR_BREDR):
+		eir_len = eir_append_data(rp->eir, eir_len, EIR_CLASS_OF_DEV,
+					  hdev->dev_class, 3);
+		break;
+	case (BIT(BDADDR_LE_PUBLIC) | BIT(BDADDR_LE_RANDOM)):
+		if (hci_dev_test_flag(hdev, HCI_PRIVACY)) {
+			memcpy(addr, &hdev->rpa, 6);
+			addr[6] = 0x01;
+		} else if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
+			   !bacmp(&hdev->bdaddr, BDADDR_ANY) ||
+			   (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) &&
+			    bacmp(&hdev->static_addr, BDADDR_ANY))) {
+			memcpy(addr, &hdev->static_addr, 6);
+			addr[6] = 0x01;
+		} else {
+			memcpy(addr, &hdev->bdaddr, 6);
+			addr[6] = 0x00;
+		}
+
+		eir_len = eir_append_data(rp->eir, eir_len, EIR_LE_BDADDR,
+					  addr, sizeof(addr));
+
+		if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
+			role = 0x02;
+		else
+			role = 0x01;
+
+		eir_len = eir_append_data(rp->eir, eir_len, EIR_LE_ROLE,
+					  &role, sizeof(role));
+
+		flags = get_adv_discov_flags(hdev);
+
+		if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
+			flags |= LE_AD_NO_BREDR;
+
+		eir_len = eir_append_data(rp->eir, eir_len, EIR_FLAGS,
+					  &flags, sizeof(flags));
+		break;
+	}
+
+	rp->type = cp->type;
+	rp->eir_len = cpu_to_le16(eir_len);
+
+	hci_dev_unlock(hdev);
+
+	err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_READ_LOCAL_OOB_EXT_DATA,
+				MGMT_STATUS_SUCCESS, rp, rp_len);
+
+	kfree(rp);
+
+	return err;
+}
+
 static int read_adv_features(struct sock *sk, struct hci_dev *hdev,
 			     void *data, u16 data_len)
 {
@@ -6379,7 +6488,7 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
 						HCI_MGMT_UNCONFIGURED },
 	{ start_service_discovery, MGMT_START_SERVICE_DISCOVERY_SIZE,
 						HCI_MGMT_VAR_LEN },
-	{ NULL },
+	{ read_local_oob_ext_data, MGMT_READ_LOCAL_OOB_EXT_DATA_SIZE },
 	{ read_ext_index_list,     MGMT_READ_EXT_INDEX_LIST_SIZE,
 						HCI_MGMT_NO_HDEV |
 						HCI_MGMT_UNTRUSTED },