netif_get_mac_address
netif_get_mac_address((struct sockaddr *)&ss, dev_net(tap->dev),
netif_get_mac_address(&ifr.ifr_hwaddr, net, tun->dev->name);
int netif_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name);
EXPORT_SYMBOL_NS_GPL(netif_get_mac_address, "NETDEV_INTERNAL");
ret = netif_get_mac_address(&ifr->ifr_hwaddr, net,