XT_UDP_INV_MASK    50 include/uapi/linux/netfilter_ipv4/ip_tables.h #define IPT_UDP_INV_MASK	XT_UDP_INV_MASK
XT_UDP_INV_MASK    50 include/uapi/linux/netfilter_ipv6/ip6_tables.h #define IP6T_UDP_INV_MASK	XT_UDP_INV_MASK