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Edit File: netfilter_bridge.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __LINUX_BRIDGE_NETFILTER_H
#define __LINUX_BRIDGE_NETFILTER_H

/* bridge-specific defines for netfilter. 
 */

#include <linux/in.h>
#include <linux/netfilter.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/if_pppox.h>

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

/* Bridge Hooks */
/* After promisc drops, checksum checks. */
#define NF_BR_PRE_ROUTING	0
/* If the packet is destined for this box. */
#define NF_BR_LOCAL_IN		1
/* If the packet is destined for another interface. */
#define NF_BR_FORWARD		2
/* Packets coming from a local process. */
#define NF_BR_LOCAL_OUT		3
/* Packets about to hit the wire. */
#define NF_BR_POST_ROUTING	4
/* Not really a hook, but used for the ebtables broute table */
#define NF_BR_BROUTING		5
#define NF_BR_NUMHOOKS		6

enum nf_br_hook_priorities {
	NF_BR_PRI_FIRST = INT_MIN,
	NF_BR_PRI_NAT_DST_BRIDGED = -300,
	NF_BR_PRI_FILTER_BRIDGED = -200,
	NF_BR_PRI_BRNF = 0,
	NF_BR_PRI_NAT_DST_OTHER = 100,
	NF_BR_PRI_FILTER_OTHER = 200,
	NF_BR_PRI_NAT_SRC = 300,
	NF_BR_PRI_LAST = INT_MAX,
};

#endif /* __LINUX_BRIDGE_NETFILTER_H */