#ifndef __NET_FIB_RULES_H
  #define __NET_FIB_RULES_H
  
  #include <linux/types.h>

  #include <linux/slab.h>

  #include <linux/netdevice.h>
  #include <linux/fib_rules.h>
  #include <net/flow.h>

  #include <net/rtnetlink.h>

  struct fib_rule {

  	struct list_head	list;
  	atomic_t		refcnt;

  	int			iifindex;

  	int			oifindex;

  	u32			mark;
  	u32			mark_mask;

  	u32			pref;
  	u32			flags;
  	u32			table;
  	u8			action;

  	u32			target;

  	struct fib_rule __rcu	*ctarget;

  	char			iifname[IFNAMSIZ];

  	char			oifname[IFNAMSIZ];

  	struct rcu_head		rcu;

  	struct net *		fr_net;

  };

  struct fib_lookup_arg {

  	void			*lookup_ptr;
  	void			*result;
  	struct fib_rule		*rule;

  	int			flags;
  #define FIB_LOOKUP_NOREF	1

  };

  struct fib_rules_ops {

  	int			family;
  	struct list_head	list;
  	int			rule_size;

  	int			addr_size;

  	int			unresolved_rules;
  	int			nr_goto_rules;

  
  	int			(*action)(struct fib_rule *,
  					  struct flowi *, int,
  					  struct fib_lookup_arg *);
  	int			(*match)(struct fib_rule *,
  					 struct flowi *, int);
  	int			(*configure)(struct fib_rule *,
  					     struct sk_buff *,

  					     struct fib_rule_hdr *,
  					     struct nlattr **);
  	int			(*compare)(struct fib_rule *,
  					   struct fib_rule_hdr *,
  					   struct nlattr **);
  	int			(*fill)(struct fib_rule *, struct sk_buff *,

  					struct fib_rule_hdr *);

  	u32			(*default_pref)(struct fib_rules_ops *ops);

  	size_t			(*nlmsg_payload)(struct fib_rule *);

  	/* Called after modifications to the rules set, must flush
  	 * the route cache if one exists. */

  	void			(*flush_cache)(struct fib_rules_ops *ops);

  	int			nlgroup;

  	const struct nla_policy	*policy;

  	struct list_head	rules_list;

  	struct module		*owner;

  	struct net		*fro_net;

  	struct rcu_head		rcu;

  };

  #define FRA_GENERIC_POLICY \

  	[FRA_IIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \

  	[FRA_OIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \

  	[FRA_PRIORITY]	= { .type = NLA_U32 }, \
  	[FRA_FWMARK]	= { .type = NLA_U32 }, \
  	[FRA_FWMASK]	= { .type = NLA_U32 }, \

  	[FRA_TABLE]     = { .type = NLA_U32 }, \
  	[FRA_GOTO]	= { .type = NLA_U32 }

  static inline void fib_rule_get(struct fib_rule *rule)
  {
  	atomic_inc(&rule->refcnt);
  }
  
  static inline void fib_rule_put_rcu(struct rcu_head *head)
  {
  	struct fib_rule *rule = container_of(head, struct fib_rule, rcu);

  	release_net(rule->fr_net);

  	kfree(rule);
  }
  
  static inline void fib_rule_put(struct fib_rule *rule)
  {
  	if (atomic_dec_and_test(&rule->refcnt))
  		call_rcu(&rule->rcu, fib_rule_put_rcu);
  }

  static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
  {
  	if (nla[FRA_TABLE])
  		return nla_get_u32(nla[FRA_TABLE]);
  	return frh->table;
  }

  extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);

  extern void fib_rules_unregister(struct fib_rules_ops *);

  
  extern int			fib_rules_lookup(struct fib_rules_ops *,
  						 struct flowi *, int flags,
  						 struct fib_lookup_arg *);

  extern int			fib_default_rule_add(struct fib_rules_ops *,
  						     u32 pref, u32 table,
  						     u32 flags);

  extern u32			fib_default_rule_pref(struct fib_rules_ops *ops);

  #endif