root/include/uapi/linux/netfilter/xt_string.h

#ifndef _XT_STRING_H
#define _XT_STRING_H

#include <linux/types.h>

#define XT_STRING_MAX_PATTERN_SIZE 128
#define XT_STRING_MAX_ALGO_NAME_SIZE 16

enum {
        XT_STRING_FLAG_INVERT           = 0x01,
        XT_STRING_FLAG_IGNORECASE       = 0x02
};

struct xt_string_info {
        __u16 from_offset;
        __u16 to_offset;
        char      algo[XT_STRING_MAX_ALGO_NAME_SIZE];
        char      pattern[XT_STRING_MAX_PATTERN_SIZE];
        __u8  patlen;
        union {
                struct {
                        __u8  invert;
                } v0;

                struct {
                        __u8  flags;
                } v1;
        } u;

        /* Used internally by the kernel */
        struct ts_config __attribute__((aligned(8))) *config;
};

#endif /*_XT_STRING_H*/