#ifndef _ADDRCONF_H
  #define _ADDRCONF_H

  #define MAX_RTR_SOLICITATIONS		3
  #define RTR_SOLICITATION_INTERVAL	(4*HZ)
  
  #define MIN_VALID_LIFETIME		(2*3600)	/* 2 hours */
  
  #define TEMP_VALID_LIFETIME		(7*86400)
  #define TEMP_PREFERRED_LIFETIME		(86400)

  #define REGEN_MAX_RETRY			(3)

  #define MAX_DESYNC_FACTOR		(600)
  
  #define ADDR_CHECK_FREQUENCY		(120*HZ)
  
  #define IPV6_MAX_ADDRESSES		16

  #include <linux/in.h>

  #include <linux/in6.h>

  struct prefix_info {
  	__u8			type;
  	__u8			length;
  	__u8			prefix_len;
  
  #if defined(__BIG_ENDIAN_BITFIELD)
  	__u8			onlink : 1,
  			 	autoconf : 1,
  				reserved : 6;
  #elif defined(__LITTLE_ENDIAN_BITFIELD)
  	__u8			reserved : 6,
  				autoconf : 1,
  				onlink : 1;
  #else
  #error "Please fix <asm/byteorder.h>"
  #endif

  	__be32			valid;
  	__be32			prefered;
  	__be32			reserved2;

  
  	struct in6_addr		prefix;
  };

  #include <linux/netdevice.h>
  #include <net/if_inet6.h>

  #include <net/ipv6.h>

  
  #define IN6_ADDR_HSIZE		16
  
  extern int			addrconf_init(void);
  extern void			addrconf_cleanup(void);

  extern int			addrconf_add_ifaddr(struct net *net,
  						    void __user *arg);
  extern int			addrconf_del_ifaddr(struct net *net,
  						    void __user *arg);
  extern int			addrconf_set_dstaddr(struct net *net,
  						     void __user *arg);

  extern int			ipv6_chk_addr(struct net *net,

  					      const struct in6_addr *addr,

  					      struct net_device *dev,
  					      int strict);

  #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)

  extern int			ipv6_chk_home_addr(struct net *net,

  						   const struct in6_addr *addr);

  #endif

  extern int			ipv6_chk_prefix(const struct in6_addr *addr,

  						struct net_device *dev);

  extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,

  						 const struct in6_addr *addr,

  						 struct net_device *dev,
  						 int strict);

  extern int			ipv6_dev_get_saddr(struct net *net,
  					       struct net_device *dev,

  					       const struct in6_addr *daddr,

  					       unsigned int srcprefs,

  					       struct in6_addr *saddr);

  extern int			ipv6_get_lladdr(struct net_device *dev,
  						struct in6_addr *addr,
  						unsigned char banned_flags);

  extern int 			ipv6_rcv_saddr_equal(const struct sock *sk,
  						    const struct sock *sk2);

  extern void			addrconf_join_solict(struct net_device *dev,

  					const struct in6_addr *addr);

  extern void			addrconf_leave_solict(struct inet6_dev *idev,

  					const struct in6_addr *addr);

  static inline unsigned long addrconf_timeout_fixup(u32 timeout,
  						    unsigned unit)
  {
  	if (timeout == 0xffffffff)
  		return ~0UL;
  
  	/*
  	 * Avoid arithmetic overflow.
  	 * Assuming unit is constant and non-zero, this "if" statement
  	 * will go away on 64bit archs.
  	 */
  	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
  		return LONG_MAX / unit;
  
  	return timeout;
  }
  
  static inline int addrconf_finite_timeout(unsigned long timeout)
  {
  	return ~timeout;
  }

  /*

   *	IPv6 Address Label subsystem (addrlabel.c)
   */
  extern int			ipv6_addr_label_init(void);

  extern void			ipv6_addr_label_cleanup(void);

  extern void			ipv6_addr_label_rtnl_register(void);

  extern u32			ipv6_addr_label(struct net *net,
  						const struct in6_addr *addr,

  						int type, int ifindex);
  
  /*

   *	multicast prototypes (mcast.c)
   */

  extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
  			     const struct in6_addr *addr);
  extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
  			     const struct in6_addr *addr);

  extern void ipv6_sock_mc_close(struct sock *sk);

  extern int inet6_mc_check(struct sock *sk,
  			  const struct in6_addr *mc_addr,
  			  const struct in6_addr *src_addr);

  extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
  extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
  extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);

  extern void ipv6_mc_up(struct inet6_dev *idev);
  extern void ipv6_mc_down(struct inet6_dev *idev);

  extern void ipv6_mc_unmap(struct inet6_dev *idev);
  extern void ipv6_mc_remap(struct inet6_dev *idev);

  extern void ipv6_mc_init_dev(struct inet6_dev *idev);
  extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
  extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);

  extern int ipv6_chk_mcast_addr(struct net_device *dev,
  			       const struct in6_addr *group,
  			       const struct in6_addr *src_addr);

  extern int ipv6_is_mld(struct sk_buff *skb, int nexthdr);

  extern void addrconf_prefix_rcv(struct net_device *dev,
  				u8 *opt, int len, bool sllao);

  /*
   *	anycast prototypes (anycast.c)
   */

  extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
  extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);

  extern void ipv6_sock_ac_close(struct sock *sk);

  extern int inet6_ac_check(struct sock *sk, const struct in6_addr *addr, int ifindex);

  extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
  extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);

  extern int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,

  			       const struct in6_addr *addr);

  
  
  /* Device notifier */
  extern int register_inet6addr_notifier(struct notifier_block *nb);
  extern int unregister_inet6addr_notifier(struct notifier_block *nb);

  /**
   * __in6_dev_get - get inet6_dev pointer from netdevice
   * @dev: network device
   *
   * Caller must hold rcu_read_lock or RTNL, because this function
   * does not take a reference on the inet6_dev.
   */
  static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)

  {

  	return rcu_dereference_rtnl(dev->ip6_ptr);

  }

  /**
   * in6_dev_get - get inet6_dev pointer from netdevice
   * @dev: network device
   *
   * This version can be used in any context, and takes a reference
   * on the inet6_dev. Callers must use in6_dev_put() later to
   * release this reference.
   */
  static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)

  {

  	struct inet6_dev *idev;

  	rcu_read_lock();

  	idev = rcu_dereference(dev->ip6_ptr);

  	if (idev)
  		atomic_inc(&idev->refcnt);

  	rcu_read_unlock();

  	return idev;
  }
  
  extern void in6_dev_finish_destroy(struct inet6_dev *idev);

  static inline void in6_dev_put(struct inet6_dev *idev)

  {
  	if (atomic_dec_and_test(&idev->refcnt))
  		in6_dev_finish_destroy(idev);
  }

  static inline void __in6_dev_put(struct inet6_dev *idev)
  {
  	atomic_dec(&idev->refcnt);
  }

  static inline void in6_dev_hold(struct inet6_dev *idev)
  {
  	atomic_inc(&idev->refcnt);
  }

  
  extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
  
  static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
  {
  	if (atomic_dec_and_test(&ifp->refcnt))
  		inet6_ifa_finish_destroy(ifp);
  }

  static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
  {
  	atomic_dec(&ifp->refcnt);
  }

  static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
  {
  	atomic_inc(&ifp->refcnt);
  }

  
  /*
   *	compute link-local solicited-node multicast address
   */
  
  static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
  					     struct in6_addr *solicited)
  {
  	ipv6_addr_set(solicited,

  		      htonl(0xFF020000), 0,
  		      htonl(0x1),
  		      htonl(0xFF000000) | addr->s6_addr32[3]);

  }

  static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
  {

  	return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);

  }
  
  static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
  {

  	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |

  		addr->s6_addr32[1] | addr->s6_addr32[2] |

  		(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;

  }
  
  static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
  {

  	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |

  		addr->s6_addr32[1] | addr->s6_addr32[2] |

  		(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;

  }

  static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
  {

  	return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);

  }

  #ifdef CONFIG_PROC_FS
  extern int if6_proc_init(void);
  extern void if6_proc_exit(void);
  #endif

  #endif