#ifndef _XT_BPF_H#define _XT_BPF_H#include<linux/filter.h>#include<linux/types.h>#define XT_BPF_MAX_NUM_INSTR 64structxt_bpf_info{__u16bpf_program_num_elem;structsock_filterbpf_program[XT_BPF_MAX_NUM_INSTR];/* only used in the kernel */structsk_filter*filter__attribute__((aligned(8)));};#endif /*_XT_BPF_H */