#ifndef _XT_ESP_H#define _XT_ESP_H#include <linux/types.h>struct xt_esp {
__u32 spis[2];/* Security Parameter Index */
__u8 invflags;/* Inverse flags */};/* Values for "invflags" field in struct xt_esp. */#define XT_ESP_INV_SPI 0x01/* Invert the sense of spi. */#define XT_ESP_INV_MASK 0x01/* All possible flags. */#endif/*_XT_ESP_H*/