#ifndef _NET_IP6_ROUTE_H
  #define _NET_IP6_ROUTE_H

  #define IP6_RT_PRIO_USER	1024
  #define IP6_RT_PRIO_ADDRCONF	256

  struct route_info {
  	__u8			type;
  	__u8			length;
  	__u8			prefix_len;
  #if defined(__BIG_ENDIAN_BITFIELD)
  	__u8			reserved_h:3,
  				route_pref:2,
  				reserved_l:3;
  #elif defined(__LITTLE_ENDIAN_BITFIELD)
  	__u8			reserved_l:3,
  				route_pref:2,
  				reserved_h:3;
  #endif

  	__be32			lifetime;

  	__u8			prefix[0];	/* 0,8 or 16 */
  };

  #include <net/flow.h>
  #include <net/ip6_fib.h>
  #include <net/sock.h>

  #include <linux/ip.h>
  #include <linux/ipv6.h>

  #define RT6_LOOKUP_F_IFACE		0x00000001
  #define RT6_LOOKUP_F_REACHABLE		0x00000002
  #define RT6_LOOKUP_F_HAS_SADDR		0x00000004
  #define RT6_LOOKUP_F_SRCPREF_TMP	0x00000008
  #define RT6_LOOKUP_F_SRCPREF_PUBLIC	0x00000010
  #define RT6_LOOKUP_F_SRCPREF_COA	0x00000020

  /*
   * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
   * between IPV6_ADDR_PREFERENCES socket option values
   *	IPV6_PREFER_SRC_TMP    = 0x1
   *	IPV6_PREFER_SRC_PUBLIC = 0x2
   *	IPV6_PREFER_SRC_COA    = 0x4
   * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
   */
  static inline int rt6_srcprefs2flags(unsigned int srcprefs)
  {
  	/* No need to bitmask because srcprefs have only 3 bits. */
  	return srcprefs << 3;
  }
  
  static inline unsigned int rt6_flags2srcprefs(int flags)
  {
  	return (flags >> 3) & 7;
  }

  extern void			rt6_bind_peer(struct rt6_info *rt,
  					      int create);

  static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
  {
  	if (rt->rt6i_peer)
  		return rt->rt6i_peer;
  
  	rt6_bind_peer(rt, 0);
  	return rt->rt6i_peer;
  }

  extern void			ip6_route_input(struct sk_buff *skb);

  extern struct dst_entry *	ip6_route_output(struct net *net,

  						 const struct sock *sk,

  						 struct flowi6 *fl6);

  extern struct dst_entry *	ip6_route_lookup(struct net *net,
  						 struct flowi6 *fl6, int flags);

  extern int			ip6_route_init(void);

  extern void			ip6_route_cleanup(void);

  extern int			ipv6_route_ioctl(struct net *net,
  						 unsigned int cmd,
  						 void __user *arg);

  extern int			ip6_route_add(struct fib6_config *cfg);

  extern int			ip6_ins_rt(struct rt6_info *);

  extern int			ip6_del_rt(struct rt6_info *);

  extern int			ip6_route_get_saddr(struct net *net,
  						    struct rt6_info *rt,

  						    const struct in6_addr *daddr,

  						    unsigned int prefs,
  						    struct in6_addr *saddr);

  extern struct rt6_info		*rt6_lookup(struct net *net,

  					    const struct in6_addr *daddr,
  					    const struct in6_addr *saddr,

  					    int oif, int flags);

  extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,

  					 struct neighbour *neigh,

  					 struct flowi6 *fl6);

  extern int icmp6_dst_gc(void);

  extern void fib6_force_start_gc(struct net *net);

  
  extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
  					   const struct in6_addr *addr,

  					   bool anycast);

  extern int			ip6_dst_hoplimit(struct dst_entry *dst);

  /*
   *	support functions for ND
   *
   */

  extern struct rt6_info *	rt6_get_dflt_router(const struct in6_addr *addr,

  						    struct net_device *dev);

  extern struct rt6_info *	rt6_add_dflt_router(const struct in6_addr *gwaddr,

  						    struct net_device *dev,
  						    unsigned int pref);

  extern void			rt6_purge_dflt_routers(struct net *net);

  extern int			rt6_route_rcv(struct net_device *dev,
  					      u8 *opt, int len,

  					      const struct in6_addr *gwaddr);

  extern void			rt6_redirect(const struct in6_addr *dest,
  					     const struct in6_addr *src,
  					     const struct in6_addr *saddr,

  					     struct neighbour *neigh,
  					     u8 *lladdr,
  					     int on_link);

  extern void			rt6_pmtu_discovery(const struct in6_addr *daddr,
  						   const struct in6_addr *saddr,

  						   struct net_device *dev,
  						   u32 pmtu);

  struct netlink_callback;

  struct rt6_rtnl_dump_arg {

  	struct sk_buff *skb;
  	struct netlink_callback *cb;

  	struct net *net;

  };
  
  extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);

  extern void rt6_ifdown(struct net *net, struct net_device *dev);

  extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);

  extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);

  
  /*
   *	Store a destination cache entry in a socket
   */

  static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,

  				   struct in6_addr *daddr, struct in6_addr *saddr)

  {
  	struct ipv6_pinfo *np = inet6_sk(sk);
  	struct rt6_info *rt = (struct rt6_info *) dst;

  	sk_setup_caps(sk, dst);

  	np->daddr_cache = daddr;

  #ifdef CONFIG_IPV6_SUBTREES
  	np->saddr_cache = saddr;
  #endif

  	np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;

  }
  
  static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,

  				 struct in6_addr *daddr, struct in6_addr *saddr)

  {

  	spin_lock(&sk->sk_dst_lock);

  	__ip6_dst_store(sk, dst, daddr, saddr);

  	spin_unlock(&sk->sk_dst_lock);

  }
  
  static inline int ipv6_unicast_destination(struct sk_buff *skb)
  {

  	struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);

  
  	return rt->rt6i_flags & RTF_LOCAL;
  }

  int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
  
  static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
  {
  	struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
  
  	return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
  	       skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
  }

  #endif