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The C and C++ Include Header Files

cat -n /usr/include/linux/netfilter/xt_rpfilter.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _XT_RPATH_H
     3	#define _XT_RPATH_H
     4	
     5	#include <linux/types.h>
     6	
     7	enum {
     8		XT_RPFILTER_LOOSE = 1 << 0,
     9		XT_RPFILTER_VALID_MARK = 1 << 1,
    10		XT_RPFILTER_ACCEPT_LOCAL = 1 << 2,
    11		XT_RPFILTER_INVERT = 1 << 3,
    12	};
    13	
    14	struct xt_rpfilter_info {
    15		__u8 flags;
    16	};
    17	
    18	#endif