#ifndef __LINUX_BRIDGE_NETFILTER_H
  #define __LINUX_BRIDGE_NETFILTER_H
  
  /* bridge-specific defines for netfilter. 
   */

  #include <linux/netfilter.h>

  #include <linux/if_ether.h>

  #include <linux/if_vlan.h>

  #include <linux/if_pppox.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
  
  #ifdef __KERNEL__
  
  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,
  };
  
  #ifdef CONFIG_BRIDGE_NETFILTER
  
  #define BRNF_PKT_TYPE			0x01
  #define BRNF_BRIDGED_DNAT		0x02
  #define BRNF_DONT_TAKE_PARENT		0x04
  #define BRNF_BRIDGED			0x08
  #define BRNF_NF_BRIDGE_PREROUTING	0x10

  
  /* Only used in br_forward.c */

  extern int nf_bridge_copy_header(struct sk_buff *skb);
  static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)

  {

  	if (skb->nf_bridge)
  		return nf_bridge_copy_header(skb);
    	return 0;

  }

  static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
  {
  	switch (skb->protocol) {
  	case __constant_htons(ETH_P_8021Q):
  		return VLAN_HLEN;
  	case __constant_htons(ETH_P_PPP_SES):
  		return PPPOE_SES_HLEN;
  	default:
  		return 0;
  	}
  }

  /* This is called by the IP fragmenting code and it ensures there is
   * enough room for the encapsulating header (if there is one). */

  static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)

  {

  	if (skb->nf_bridge)
  		return nf_bridge_encap_header_len(skb);
  	return 0;

  }
  
  struct bridge_skb_cb {
  	union {

  		__be32 ipv4;

  	} daddr;
  };

  #else
  #define nf_bridge_maybe_copy_header(skb)	(0)

  #define nf_bridge_pad(skb)			(0)

  #endif /* CONFIG_BRIDGE_NETFILTER */
  
  #endif /* __KERNEL__ */
  #endif