#ifndef _NF_NAT_RULE_H
  #define _NF_NAT_RULE_H
  #include <net/netfilter/nf_conntrack.h>
  #include <net/netfilter/nf_nat.h>
  #include <linux/netfilter_ipv4/ip_tables.h>

  extern int nf_nat_rule_init(void) __init;
  extern void nf_nat_rule_cleanup(void);

  extern int nf_nat_rule_find(struct sk_buff *skb,

  			    unsigned int hooknum,
  			    const struct net_device *in,
  			    const struct net_device *out,

  			    struct nf_conn *ct);

  #endif /* _NF_NAT_RULE_H */