✏ EDIT: netfilter_ipv6.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/* IPv6-specific defines for netfilter. 
 * (C)1998 Rusty Russell -- This code is GPL.
 * (C)1999 David Jeffery
 *   this header was blatantly ripped from netfilter_ipv4.h 
 *   it's amazing what adding a bunch of 6s can do =8^)
 */
#ifndef __LINUX_IP6_NETFILTER_H
#define __LINUX_IP6_NETFILTER_H

#include <linux/netfilter.h>

/* only for userspace compatibility */

#include <limits.h> /* for INT_MIN, INT_MAX */

/* IP Cache bits. */
/* Src IP address. */
#define NFC_IP6_SRC              0x0001
/* Dest IP address. */
#define NFC_IP6_DST              0x0002
/* Input device. */
#define NFC_IP6_IF_IN            0x0004
/* Output device. */
#define NFC_IP6_IF_OUT           0x0008
/* TOS. */
#define NFC_IP6_TOS              0x0010
/* Protocol. */
#define NFC_IP6_PROTO            0x0020
/* IP options. */
#define NFC_IP6_OPTIONS          0x0040
/* Frag & flags. */
#define NFC_IP6_FRAG             0x0080

/* Per-protocol information: only matters if proto match. */
/* TCP flags. */
#define NFC_IP6_TCPFLAGS         0x0100
/* Source port. */
#define NFC_IP6_SRC_PT           0x0200
/* Dest port. */
#define NFC_IP6_DST_PT           0x0400
/* Something else about the proto */
#define NFC_IP6_PROTO_UNKNOWN    0x2000

/* IP6 Hooks */
/* After promisc drops, checksum checks. */
#define NF_IP6_PRE_ROUTING	0
/* If the packet is destined for this box. */
#define NF_IP6_LOCAL_IN		1
/* If the packet is destined for another interface. */
#define NF_IP6_FORWARD		2
/* Packets coming from a local process. */
#define NF_IP6_LOCAL_OUT		3
/* Packets about to hit the wire. */
#define NF_IP6_POST_ROUTING	4
#define NF_IP6_NUMHOOKS		5

enum nf_ip6_hook_priorities {
	NF_IP6_PRI_FIRST = INT_MIN,
	NF_IP6_PRI_RAW_BEFORE_DEFRAG = -450,
	NF_IP6_PRI_CONNTRACK_DEFRAG = -400,
	NF_IP6_PRI_RAW = -300,
	NF_IP6_PRI_SELINUX_FIRST = -225,
	NF_IP6_PRI_CONNTRACK = -200,
	NF_IP6_PRI_MANGLE = -150,
	NF_IP6_PRI_NAT_DST = -100,
	NF_IP6_PRI_FILTER = 0,
	NF_IP6_PRI_SECURITY = 50,
	NF_IP6_PRI_NAT_SRC = 100,
	NF_IP6_PRI_SELINUX_LAST = 225,
	NF_IP6_PRI_CONNTRACK_HELPER = 300,
	NF_IP6_PRI_LAST = INT_MAX,
};

#endif /* __LINUX_IP6_NETFILTER_H */

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