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The C and C++ Include Header Files

/usr/include/linux/netfilter_arp.h


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

     1	/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
     2	#ifndef __LINUX_ARP_NETFILTER_H
     3	#define __LINUX_ARP_NETFILTER_H
     4	
     5	/* ARP-specific defines for netfilter.
     6	 * (C)2002 Rusty Russell IBM -- This code is GPL.
     7	 */
     8	
     9	#include <linux/netfilter.h>
    10	
    11	/* There is no PF_ARP. */
    12	#define NF_ARP		0
    13	
    14	/* ARP Hooks */
    15	#define NF_ARP_IN	0
    16	#define NF_ARP_OUT	1
    17	#define NF_ARP_FORWARD	2
    18	
    19	#define NF_ARP_NUMHOOKS	3
    20	
    21	#endif /* __LINUX_ARP_NETFILTER_H */