* @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
* packet is not being tunneled.
* @ip_summed: Consistently stores L4 checksumming status across different
* @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
* packet is not being tunneled.
* @ip_summed: Consistently stores L4 checksumming status across different