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 wireless_dev *wdev;
	struct sk_buff *msg;
	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;
	}

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	err = parse_monitor_flags(type == NL80211_IFTYPE_MONITOR ?
				  info->attrs[NL80211_ATTR_MNTR_FLAGS] : NULL,
				  &flags);
	wdev = rdev_add_virtual_intf(rdev,
				nla_data(info->attrs[NL80211_ATTR_IFNAME]),
				type, err ? NULL : &flags, &params);
	if (IS_ERR(wdev)) {
		nlmsg_free(msg);
		return PTR_ERR(wdev);
	}

	switch (type) {
	case NL80211_IFTYPE_MESH_POINT:
		if (!info->attrs[NL80211_ATTR_MESH_ID])
			break;
		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);
		break;
	case NL80211_IFTYPE_P2P_DEVICE:
		/*
		 * P2P Device doesn't have a netdev, so doesn't go
		 * through the netdev notifier and must be added here
		 */
		mutex_init(&wdev->mtx);
		INIT_LIST_HEAD(&wdev->event_list);
		spin_lock_init(&wdev->event_lock);
		INIT_LIST_HEAD(&wdev->mgmt_registrations);
		spin_lock_init(&wdev->mgmt_registrations_lock);

		mutex_lock(&rdev->devlist_mtx);
		wdev->identifier = ++rdev->wdev_id;
		list_add_rcu(&wdev->list, &rdev->wdev_list);
		rdev->devlist_generation++;
		mutex_unlock(&rdev->devlist_mtx);
		break;
	default:
		break;
	}

	if (nl80211_send_iface(msg, info->snd_portid, info->snd_seq, 0,
			       rdev, wdev) < 0) {
		nlmsg_free(msg);
		return -ENOBUFS;
	}

	return genlmsg_reply(msg, info);
}
Unknown