#ifndef _IPT_AH_H#define _IPT_AH_H#include<linux/types.h>structipt_ah{__u32spis[2];/* Security Parameter Index */__u8invflags;/* Inverse flags */};/* Values for "invflags" field in struct ipt_ah. */#define IPT_AH_INV_SPI 0x01 /* Invert the sense of spi. */#define IPT_AH_INV_MASK 0x01 /* All possible flags. */#endif /*_IPT_AH_H*/