#ifndef __NETFILTER_IP6T_NPT#define __NETFILTER_IP6T_NPT#include<linux/types.h>#include<linux/netfilter.h>structip6t_npt_tginfo{unionnf_inet_addrsrc_pfx;unionnf_inet_addrdst_pfx;__u8src_pfx_len;__u8dst_pfx_len;/* Used internally by the kernel */__sum16adjustment;};#endif /* __NETFILTER_IP6T_NPT */