#ifndef _LINUX_INETDEVICE_H
  #define _LINUX_INETDEVICE_H
  
  #ifdef __KERNEL__

  #include <linux/bitmap.h>

  #include <linux/if.h>
  #include <linux/netdevice.h>
  #include <linux/rcupdate.h>
  #include <linux/timer.h>

  #include <linux/sysctl.h>

  
  struct ipv4_devconf
  {

  	void	*sysctl;

  	int	data[__NET_IPV4_CONF_MAX - 1];

  	DECLARE_BITMAP(state, __NET_IPV4_CONF_MAX - 1);

  };

  struct in_device
  {
  	struct net_device	*dev;
  	atomic_t		refcnt;
  	int			dead;
  	struct in_ifaddr	*ifa_list;	/* IP ifaddr chain		*/
  	rwlock_t		mc_list_lock;
  	struct ip_mc_list	*mc_list;	/* IP multicast filter chain    */
  	spinlock_t		mc_tomb_lock;
  	struct ip_mc_list	*mc_tomb;
  	unsigned long		mr_v1_seen;
  	unsigned long		mr_v2_seen;
  	unsigned long		mr_maxdelay;
  	unsigned char		mr_qrv;
  	unsigned char		mr_gq_running;
  	unsigned char		mr_ifc_count;
  	struct timer_list	mr_gq_timer;	/* general query timer */
  	struct timer_list	mr_ifc_timer;	/* interface change timer */
  
  	struct neigh_parms	*arp_parms;
  	struct ipv4_devconf	cnf;
  	struct rcu_head		rcu_head;
  };

  #define IPV4_DEVCONF(cnf, attr) ((cnf).data[NET_IPV4_CONF_ ## attr - 1])

  #define IPV4_DEVCONF_ALL(net, attr) \
  	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)

  
  static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  {
  	index--;
  	return in_dev->cnf.data[index];
  }
  
  static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
  				    int val)
  {
  	index--;

  	set_bit(index, in_dev->cnf.state);

  	in_dev->cnf.data[index] = val;
  }

  static inline void ipv4_devconf_setall(struct in_device *in_dev)
  {
  	bitmap_fill(in_dev->cnf.state, __NET_IPV4_CONF_MAX - 1);
  }

  #define IN_DEV_CONF_GET(in_dev, attr) \
  	ipv4_devconf_get((in_dev), NET_IPV4_CONF_ ## attr)
  #define IN_DEV_CONF_SET(in_dev, attr, val) \
  	ipv4_devconf_set((in_dev), NET_IPV4_CONF_ ## attr, (val))
  
  #define IN_DEV_ANDCONF(in_dev, attr) \

  	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \

  	 IN_DEV_CONF_GET((in_dev), attr))

  #define IN_DEV_ORCONF(in_dev, attr) \

  	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) || \

  	 IN_DEV_CONF_GET((in_dev), attr))

  #define IN_DEV_MAXCONF(in_dev, attr) \

  	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \

  	     IN_DEV_CONF_GET((in_dev), attr)))

  
  #define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)

  #define IN_DEV_MFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), MC_FORWARDING)

  #define IN_DEV_RPFILTER(in_dev)		IN_DEV_ANDCONF((in_dev), RP_FILTER)
  #define IN_DEV_SOURCE_ROUTE(in_dev)	IN_DEV_ANDCONF((in_dev), \
  						       ACCEPT_SOURCE_ROUTE)
  #define IN_DEV_BOOTP_RELAY(in_dev)	IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
  
  #define IN_DEV_LOG_MARTIANS(in_dev)	IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
  #define IN_DEV_PROXY_ARP(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP)
  #define IN_DEV_SHARED_MEDIA(in_dev)	IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
  #define IN_DEV_TX_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
  #define IN_DEV_SEC_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), \
  						      SECURE_REDIRECTS)
  #define IN_DEV_IDTAG(in_dev)		IN_DEV_CONF_GET(in_dev, TAG)
  #define IN_DEV_MEDIUM_ID(in_dev)	IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
  #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
  					IN_DEV_ORCONF((in_dev), \
  						      PROMOTE_SECONDARIES)

  
  #define IN_DEV_RX_REDIRECTS(in_dev) \
  	((IN_DEV_FORWARD(in_dev) && \

  	  IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \

  	 || (!IN_DEV_FORWARD(in_dev) && \

  	  IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))

  #define IN_DEV_ARPFILTER(in_dev)	IN_DEV_ORCONF((in_dev), ARPFILTER)
  #define IN_DEV_ARP_ANNOUNCE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
  #define IN_DEV_ARP_IGNORE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_IGNORE)

  
  struct in_ifaddr
  {
  	struct in_ifaddr	*ifa_next;
  	struct in_device	*ifa_dev;
  	struct rcu_head		rcu_head;

  	__be32			ifa_local;
  	__be32			ifa_address;
  	__be32			ifa_mask;
  	__be32			ifa_broadcast;

  	unsigned char		ifa_scope;
  	unsigned char		ifa_flags;
  	unsigned char		ifa_prefixlen;
  	char			ifa_label[IFNAMSIZ];
  };
  
  extern int register_inetaddr_notifier(struct notifier_block *nb);
  extern int unregister_inetaddr_notifier(struct notifier_block *nb);

  extern struct net_device *ip_dev_find(struct net *net, __be32 addr);

  extern int		inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);

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

  extern void		devinet_init(void);

  extern struct in_device	*inetdev_by_index(struct net *, int);

  extern __be32		inet_select_addr(const struct net_device *dev, __be32 dst, int scope);

  extern __be32		inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);

  extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);

  static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)

  {
  	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
  }
  
  /*
   *	Check if a mask is acceptable.
   */
   

  static __inline__ int bad_mask(__be32 mask, __be32 addr)

  {

  	__u32 hmask;

  	if (addr & (mask = ~mask))
  		return 1;

  	hmask = ntohl(mask);
  	if (hmask & (hmask+1))

  		return 1;
  	return 0;
  }
  
  #define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \
    for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
  
  #define for_ifa(in_dev)	{ struct in_ifaddr *ifa; \
    for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
  
  
  #define endfor_ifa(in_dev) }

  static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
  {
  	struct in_device *in_dev = dev->ip_ptr;
  	if (in_dev)
  		in_dev = rcu_dereference(in_dev);
  	return in_dev;
  }

  static __inline__ struct in_device *
  in_dev_get(const struct net_device *dev)
  {
  	struct in_device *in_dev;
  
  	rcu_read_lock();

  	in_dev = __in_dev_get_rcu(dev);

  	if (in_dev)
  		atomic_inc(&in_dev->refcnt);
  	rcu_read_unlock();
  	return in_dev;
  }
  
  static __inline__ struct in_device *

  __in_dev_get_rtnl(const struct net_device *dev)

  {
  	return (struct in_device*)dev->ip_ptr;
  }
  
  extern void in_dev_finish_destroy(struct in_device *idev);
  
  static inline void in_dev_put(struct in_device *idev)
  {
  	if (atomic_dec_and_test(&idev->refcnt))
  		in_dev_finish_destroy(idev);
  }
  
  #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
  #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
  
  #endif /* __KERNEL__ */

  static __inline__ __be32 inet_make_mask(int logmask)

  {
  	if (logmask)
  		return htonl(~((1<<(32-logmask))-1));
  	return 0;
  }

  static __inline__ int inet_mask_len(__be32 mask)

  {

  	__u32 hmask = ntohl(mask);
  	if (!hmask)

  		return 0;

  	return 32 - ffz(~hmask);

  }
  
  
  #endif /* _LINUX_INETDEVICE_H */