#ifndef _ADDRCONF_H
#define _ADDRCONF_H

#define RETRANS_TIMER	HZ

#define MAX_RTR_SOLICITATIONS		3
#define RTR_SOLICITATION_INTERVAL	(4*HZ)

#define ADDR_CHECK_FREQUENCY		(120*HZ)

struct prefix_info {
	__u8			type;
	__u8			length;
	__u8			prefix_len;

#if defined(__BIG_ENDIAN_BITFIELD)
	__u8			onlink : 1,
			 	autoconf : 1,
				router_address : 1,
				reserved : 5;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
	__u8			reserved : 5,
				router_address : 1,
				autoconf : 1,
				onlink : 1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	__u32			valid;
	__u32			prefered;
	__u32			reserved2;

	struct in6_addr		prefix;
};


#ifdef __KERNEL__

#include <linux/in6.h>
#include <linux/netdevice.h>
#include <net/if_inet6.h>

#define IN6_ADDR_HSIZE		16

extern void			addrconf_init(void);
extern void			addrconf_cleanup(void);

extern int		        addrconf_notify(struct notifier_block *this, 
						unsigned long event, 
						void * data);

extern int			addrconf_add_ifaddr(void *arg);
extern int			addrconf_del_ifaddr(void *arg);
extern int			addrconf_set_dstaddr(void *arg);

extern int			ipv6_chk_addr(struct in6_addr *addr,
					      struct net_device *dev);
extern struct inet6_ifaddr *	ipv6_get_ifaddr(struct in6_addr *addr,
						struct net_device *dev);
extern int			ipv6_get_saddr(struct dst_entry *dst, 
					       struct in6_addr *daddr,
					       struct in6_addr *saddr);
extern int			ipv6_get_lladdr(struct net_device *dev, struct in6_addr *);

/*
 *	multicast prototypes (mcast.c)
 */
extern int			ipv6_sock_mc_join(struct sock *sk, 
						  int ifindex, 
						  struct in6_addr *addr);
extern int			ipv6_sock_mc_drop(struct sock *sk,
						  int ifindex, 
						  struct in6_addr *addr);
extern void			ipv6_sock_mc_close(struct sock *sk);
extern int			inet6_mc_check(struct sock *sk, struct in6_addr *addr);

extern int			ipv6_dev_mc_inc(struct net_device *dev,
						struct in6_addr *addr);
extern int			ipv6_dev_mc_dec(struct net_device *dev,
						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_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,
						    struct in6_addr *addr);

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

static inline struct inet6_dev *
__in6_dev_get(struct net_device *dev)
{
	return (struct inet6_dev *)dev->ip6_ptr;
}

extern rwlock_t addrconf_lock;

static inline struct inet6_dev *
in6_dev_get(struct net_device *dev)
{
	struct inet6_dev *idev = NULL;
	read_lock(&addrconf_lock);
	idev = dev->ip6_ptr;
	if (idev)
		atomic_inc(&idev->refcnt);
	read_unlock(&addrconf_lock);
	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);
}

#define __in6_dev_put(idev)  atomic_dec(&(idev)->refcnt)
#define in6_dev_hold(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);
}

#define __in6_ifa_put(idev)  atomic_dec(&(idev)->refcnt)
#define in6_ifa_hold(idev)   atomic_inc(&(idev)->refcnt)


extern void			addrconf_forwarding_on(void);
/*
 *	Hash function taken from net_alias.c
 */

static __inline__ u8 ipv6_addr_hash(struct in6_addr *addr)
{	
	__u32 word;

	/* 
	 * We perform the hash function over the last 64 bits of the address
	 * This will include the IEEE address token on links that support it.
	 */

	word = addr->s6_addr[2] ^ addr->s6_addr32[3];
	word  ^= (word>>16);
	word ^= (word >> 8);

	return ((word ^ (word >> 4)) & 0x0f);
}

/*
 *	compute link-local solicited-node multicast address
 */

static inline void addrconf_addr_solict_mult(struct in6_addr *addr,
					     struct in6_addr *solicited)
{
	ipv6_addr_set(solicited,
		      __constant_htonl(0xFF020000), 0,
		      __constant_htonl(0x1),
		      __constant_htonl(0xFF000000) | addr->s6_addr32[3]);
}


static inline void ipv6_addr_all_nodes(struct in6_addr *addr)
{
	ipv6_addr_set(addr,
		      __constant_htonl(0xFF020000), 0, 0,
		      __constant_htonl(0x1));
}

static inline void ipv6_addr_all_routers(struct in6_addr *addr)
{
	ipv6_addr_set(addr,
		      __constant_htonl(0xFF020000), 0, 0,
		      __constant_htonl(0x2));
}

static inline int ipv6_addr_is_multicast(struct in6_addr *addr)
{
	return (addr->s6_addr32[0] & __constant_htonl(0xFF000000)) == __constant_htonl(0xFF000000);
}

#endif
#endif
