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The C and C++ Include Header Files

cat -n /usr/include/linux/netfilter_arp/arpt_mangle.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _ARPT_MANGLE_H
     3	#define _ARPT_MANGLE_H
     4	#include <linux/netfilter_arp/arp_tables.h>
     5	
     6	#define ARPT_MANGLE_ADDR_LEN_MAX sizeof(struct in_addr)
     7	struct arpt_mangle
     8	{
     9		char src_devaddr[ARPT_DEV_ADDR_LEN_MAX];
    10		char tgt_devaddr[ARPT_DEV_ADDR_LEN_MAX];
    11		union {
    12			struct in_addr src_ip;
    13		} u_s;
    14		union {
    15			struct in_addr tgt_ip;
    16		} u_t;
    17		__u8 flags;
    18		int target;
    19	};
    20	
    21	#define ARPT_MANGLE_SDEV 0x01
    22	#define ARPT_MANGLE_TDEV 0x02
    23	#define ARPT_MANGLE_SIP 0x04
    24	#define ARPT_MANGLE_TIP 0x08
    25	#define ARPT_MANGLE_MASK 0x0f
    26	
    27	#endif /* _ARPT_MANGLE_H */