static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
{
	struct cfg80211_registered_device *rdev = info->user_ptr[0];
	struct vif_params params;
	struct net_device *dev;
	int err;
	enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
	u32 flags;

	memset(&params, 0, sizeof(params));

	if (!info->attrs[NL80211_ATTR_IFNAME])
		return -EINVAL;

	if (info->attrs[NL80211_ATTR_IFTYPE]) {
		type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
		if (type > NL80211_IFTYPE_MAX)
			return -EINVAL;
	}

	if (!rdev->ops->add_virtual_intf ||
	    !(rdev->wiphy.interface_modes & (1 << type)))
		return -EOPNOTSUPP;

	if (info->attrs[NL80211_ATTR_4ADDR]) {
		params.use_4addr = !!nla_get_u8(info->attrs[NL80211_ATTR_4ADDR]);
		err = nl80211_valid_4addr(rdev, NULL, params.use_4addr, type);
		if (err)
			return err;
	}

	err = parse_monitor_flags(type == NL80211_IFTYPE_MONITOR ?
				  info->attrs[NL80211_ATTR_MNTR_FLAGS] : NULL,
				  &flags);
	dev = rdev->ops->add_virtual_intf(&rdev->wiphy,
		nla_data(info->attrs[NL80211_ATTR_IFNAME]),
		type, err ? NULL : &flags, &params);
	if (IS_ERR(dev))
		return PTR_ERR(dev);

	if (type == NL80211_IFTYPE_MESH_POINT &&
	    info->attrs[NL80211_ATTR_MESH_ID]) {
		struct wireless_dev *wdev = dev->ieee80211_ptr;

		wdev_lock(wdev);
		BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN !=
			     IEEE80211_MAX_MESH_ID_LEN);
		wdev->mesh_id_up_len =
			nla_len(info->attrs[NL80211_ATTR_MESH_ID]);
		memcpy(wdev->ssid, nla_data(info->attrs[NL80211_ATTR_MESH_ID]),
		       wdev->mesh_id_up_len);
		wdev_unlock(wdev);
	}

	return 0;
}
static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
{
	struct cfg80211_registered_device *rdev = info->user_ptr[0];
	struct vif_params params;
	struct net_device *dev;
	int err;
	enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
	u32 flags;

	memset(&params, 0, sizeof(params));

	if (!info->attrs[NL80211_ATTR_IFNAME])
		return -EINVAL;

	if (info->attrs[NL80211_ATTR_IFTYPE]) {
		type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
		if (type > NL80211_IFTYPE_MAX)
			return -EINVAL;
	}

	if (!rdev->ops->add_virtual_intf ||
	    !(rdev->wiphy.interface_modes & (1 << type)))
		return -EOPNOTSUPP;

	if (info->attrs[NL80211_ATTR_4ADDR]) {
		params.use_4addr = !!nla_get_u8(info->attrs[NL80211_ATTR_4ADDR]);
		err = nl80211_valid_4addr(rdev, NULL, params.use_4addr, type);
		if (err)
			return err;
	}

	err = parse_monitor_flags(type == NL80211_IFTYPE_MONITOR ?
				  info->attrs[NL80211_ATTR_MNTR_FLAGS] : NULL,
				  &flags);
	dev = rdev->ops->add_virtual_intf(&rdev->wiphy,
		nla_data(info->attrs[NL80211_ATTR_IFNAME]),
		type, err ? NULL : &flags, &params);
	if (IS_ERR(dev))
		return PTR_ERR(dev);

	if (type == NL80211_IFTYPE_MESH_POINT &&
	    info->attrs[NL80211_ATTR_MESH_ID]) {
		struct wireless_dev *wdev = dev->ieee80211_ptr;

		wdev_lock(wdev);
		BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN !=
			     IEEE80211_MAX_MESH_ID_LEN);
		wdev->mesh_id_up_len =
			nla_len(info->attrs[NL80211_ATTR_MESH_ID]);
		memcpy(wdev->ssid, nla_data(info->attrs[NL80211_ATTR_MESH_ID]),
		       wdev->mesh_id_up_len);
		wdev_unlock(wdev);
	}

	return 0;
}