code: func NetworkLinkAddIp(iface *net.Interface, ip net.IP, ipNet *net.IPNet) error {
  	return networkLinkIpAction(
  		syscall.RTM_NEWADDR,
  		syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK,
  		IfAddr{iface, ip, ipNet},
  	)
  }
docs: // Add an Ip address to an interface. This is identical to:
  // ip addr add $ip/$ipNet dev $iface