#ifndef _XT_CT_H#define _XT_CT_H#include<linux/types.h>#define XT_CT_NOTRACK 0x1structxt_ct_target_info{__u16flags;__u16zone;__u32ct_events;__u32exp_events;charhelper[16];/* Used internally by the kernel */structnf_conn*ct__attribute__((aligned(8)));};#endif /* _XT_CT_H */