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The C and C++ Include Header Files

cat -n /usr/include/linux/netfilter/xt_u32.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _XT_U32_H
     3	#define _XT_U32_H 1
     4	
     5	#include <linux/types.h>
     6	
     7	enum xt_u32_ops {
     8		XT_U32_AND,
     9		XT_U32_LEFTSH,
    10		XT_U32_RIGHTSH,
    11		XT_U32_AT,
    12	};
    13	
    14	struct xt_u32_location_element {
    15		__u32 number;
    16		__u8 nextop;
    17	};
    18	
    19	struct xt_u32_value_element {
    20		__u32 min;
    21		__u32 max;
    22	};
    23	
    24	/*
    25	 * Any way to allow for an arbitrary number of elements?
    26	 * For now, I settle with a limit of 10 each.
    27	 */
    28	#define XT_U32_MAXSIZE 10
    29	
    30	struct xt_u32_test {
    31		struct xt_u32_location_element location[XT_U32_MAXSIZE+1];
    32		struct xt_u32_value_element value[XT_U32_MAXSIZE+1];
    33		__u8 nnums;
    34		__u8 nvalues;
    35	};
    36	
    37	struct xt_u32 {
    38		struct xt_u32_test tests[XT_U32_MAXSIZE+1];
    39		__u8 ntests;
    40		__u8 invert;
    41	};
    42	
    43	#endif /* _XT_U32_H */