include/linux/netfilter_bridge.h

#ifndef __LINUX_BRIDGE_NETFILTER_H
#define __LINUX_BRIDGE_NETFILTER_H

/* bridge-specific defines for netfilter. 
 */
#include <limits.h>

/* 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_FILTER_BRIDGED = -200,
	NF_BR_PRI_FILTER_OTHER = 200,
	NF_BR_PRI_NAT_DST_BRIDGED = -300,
	NF_BR_PRI_NAT_DST_OTHER = 100,
	NF_BR_PRI_NAT_SRC = 300,
	NF_BR_PRI_LAST = INT_MAX,
};

#endif