+/* struct flow_keys:
+ * @src: source ip address in case of IPv4
+ * For IPv6 it contains 32bit hash of src address
+ * @dst: destination ip address in case of IPv4
+ * For IPv6 it contains 32bit hash of dst address
+ * @ports: port numbers of Transport header
+ * port16[0]: src port number
+ * port16[1]: dst port number
+ * @thoff: Transport header offset
+ * @n_proto: Network header protocol (eg. IPv4/IPv6)
+ * @ip_proto: Transport header protocol (eg. TCP/UDP)
+ * All the members, except thoff, are in network byte order.
+ */