#ifndef _XT_ESP_H#define _XT_ESP_Hstructxt_esp{u_int32_tspis[2];/* Security Parameter Index */u_int8_tinvflags;/* 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*/