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The C and C++ Include Header Files

cat -n /usr/include/linux/netfilter_ipv6.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/* IPv6-specific defines for netfilter. 
     3	 * (C)1998 Rusty Russell -- This code is GPL.
     4	 * (C)1999 David Jeffery
     5	 *   this header was blatantly ripped from netfilter_ipv4.h 
     6	 *   it's amazing what adding a bunch of 6s can do =8^)
     7	 */
     8	#ifndef __LINUX_IP6_NETFILTER_H
     9	#define __LINUX_IP6_NETFILTER_H
    10	
    11	
    12	#include <linux/netfilter.h>
    13	#include <linux/typelimits.h>
    14	
    15	/* only for userspace compatibility */
    16	
    17	/* IP6 Hooks */
    18	/* After promisc drops, checksum checks. */
    19	#define NF_IP6_PRE_ROUTING	0
    20	/* If the packet is destined for this box. */
    21	#define NF_IP6_LOCAL_IN		1
    22	/* If the packet is destined for another interface. */
    23	#define NF_IP6_FORWARD		2
    24	/* Packets coming from a local process. */
    25	#define NF_IP6_LOCAL_OUT		3
    26	/* Packets about to hit the wire. */
    27	#define NF_IP6_POST_ROUTING	4
    28	#define NF_IP6_NUMHOOKS		5
    29	
    30	
    31	enum nf_ip6_hook_priorities {
    32		NF_IP6_PRI_FIRST = __KERNEL_INT_MIN,
    33		NF_IP6_PRI_RAW_BEFORE_DEFRAG = -450,
    34		NF_IP6_PRI_CONNTRACK_DEFRAG = -400,
    35		NF_IP6_PRI_RAW = -300,
    36		NF_IP6_PRI_SELINUX_FIRST = -225,
    37		NF_IP6_PRI_CONNTRACK = -200,
    38		NF_IP6_PRI_MANGLE = -150,
    39		NF_IP6_PRI_NAT_DST = -100,
    40		NF_IP6_PRI_FILTER = 0,
    41		NF_IP6_PRI_SECURITY = 50,
    42		NF_IP6_PRI_NAT_SRC = 100,
    43		NF_IP6_PRI_SELINUX_LAST = 225,
    44		NF_IP6_PRI_CONNTRACK_HELPER = 300,
    45		NF_IP6_PRI_LAST = __KERNEL_INT_MAX,
    46	};
    47	
    48	
    49	#endif /* __LINUX_IP6_NETFILTER_H */