static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, int __user *optlen)
{
	struct hci_ufilter uf;
	struct sock *sk = sock->sk;
	int len, opt, err = 0;

	BT_DBG("sk %p, opt %d", sk, optname);

	if (get_user(len, optlen))
		return -EFAULT;

	lock_sock(sk);

	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
		err = -EINVAL;
		goto done;
	}

	switch (optname) {
	case HCI_DATA_DIR:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
			opt = 1;
		else
			opt = 0;

		if (put_user(opt, optval))
			err = -EFAULT;
		break;

	case HCI_TIME_STAMP:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
			opt = 1;
		else
			opt = 0;

		if (put_user(opt, optval))
			err = -EFAULT;
		break;

	case HCI_FILTER:
		{
			struct hci_filter *f = &hci_pi(sk)->filter;

			memset(&uf, 0, sizeof(uf));
			uf.type_mask = f->type_mask;
			uf.opcode    = f->opcode;
			uf.event_mask[0] = *((u32 *) f->event_mask + 0);
			uf.event_mask[1] = *((u32 *) f->event_mask + 1);
		}

		len = min_t(unsigned int, len, sizeof(uf));
		if (copy_to_user(optval, &uf, len))
			err = -EFAULT;
		break;

	default:
		err = -ENOPROTOOPT;
		break;
	}

done:
	release_sock(sk);
	return err;
}
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