#ifndef _NET_DN_DEV_H
  #define _NET_DN_DEV_H
  
  
  struct dn_dev;
  
  struct dn_ifaddr {

  	struct dn_ifaddr __rcu *ifa_next;

  	struct dn_dev    *ifa_dev;

  	__le16            ifa_local;
  	__le16            ifa_address;
  	__u8              ifa_flags;
  	__u8              ifa_scope;
  	char              ifa_label[IFNAMSIZ];

  	struct rcu_head   rcu;

  };
  
  #define DN_DEV_S_RU  0 /* Run - working normally   */
  #define DN_DEV_S_CR  1 /* Circuit Rejected         */
  #define DN_DEV_S_DS  2 /* Data Link Start          */
  #define DN_DEV_S_RI  3 /* Routing Layer Initialize */
  #define DN_DEV_S_RV  4 /* Routing Layer Verify     */
  #define DN_DEV_S_RC  5 /* Routing Layer Complete   */
  #define DN_DEV_S_OF  6 /* Off                      */
  #define DN_DEV_S_HA  7 /* Halt                     */
  
  
  /*
   * The dn_dev_parms structure contains the set of parameters
   * for each device (hence inclusion in the dn_dev structure)
   * and an array is used to store the default types of supported
   * device (in dn_dev.c).
   *
   * The type field matches the ARPHRD_ constants and is used in
   * searching the list for supported devices when new devices
   * come up.
   *
   * The mode field is used to find out if a device is broadcast,
   * multipoint, or pointopoint. Please note that DECnet thinks
   * different ways about devices to the rest of the kernel
   * so the normal IFF_xxx flags are invalid here. For devices
   * which can be any combination of the previously mentioned
   * attributes, you can set this on a per device basis by
   * installing an up() routine.
   *
   * The device state field, defines the initial state in which the
   * device will come up. In the dn_dev structure, it is the actual
   * state.
   *
   * Things have changed here. I've killed timer1 since it's a user space
   * issue for a user space routing deamon to sort out. The kernel does
   * not need to be bothered with it.
   *
   * Timers:
   * t2 - Rate limit timer, min time between routing and hello messages
   * t3 - Hello timer, send hello messages when it expires
   *
   * Callbacks:
   * up() - Called to initialize device, return value can veto use of
   *        device with DECnet.
   * down() - Called to turn device off when it goes down
   * timer3() - Called once for each ifaddr when timer 3 goes off
   * 
   * sysctl - Hook for sysctl things
   *
   */
  struct dn_dev_parms {
  	int type;	          /* ARPHRD_xxx                         */
  	int mode;	          /* Broadcast, Unicast, Mulitpoint     */
  #define DN_DEV_BCAST  1
  #define DN_DEV_UCAST  2
  #define DN_DEV_MPOINT 4
  	int state;                /* Initial state                      */
  	int forwarding;	          /* 0=EndNode, 1=L1Router, 2=L2Router  */
  	unsigned long t2;         /* Default value of t2                */
  	unsigned long t3;         /* Default value of t3                */
  	int priority;             /* Priority to be a router            */
  	char *name;               /* Name for sysctl                    */

  	int  (*up)(struct net_device *);
  	void (*down)(struct net_device *);
  	void (*timer3)(struct net_device *, struct dn_ifaddr *ifa);
  	void *sysctl;
  };
  
  
  struct dn_dev {

  	struct dn_ifaddr __rcu *ifa_list;

  	struct net_device *dev;
  	struct dn_dev_parms parms;
  	char use_long;

  	struct timer_list timer;
  	unsigned long t3;

  	struct neigh_parms *neigh_parms;

  	__u8 addr[ETH_ALEN];

  	struct neighbour *router; /* Default router on circuit */
  	struct neighbour *peer;   /* Peer on pointopoint links */
  	unsigned long uptime;     /* Time device went up in jiffies */
  };

  struct dn_short_packet {

  	__u8    msgflg;
  	__le16 dstnode;
  	__le16 srcnode;
  	__u8   forward;

  } __packed;

  struct dn_long_packet {

  	__u8   msgflg;
  	__u8   d_area;
  	__u8   d_subarea;
  	__u8   d_id[6];
  	__u8   s_area;
  	__u8   s_subarea;
  	__u8   s_id[6];
  	__u8   nl2;
  	__u8   visit_ct;
  	__u8   s_class;
  	__u8   pt;

  } __packed;

  
  /*------------------------- DRP - Routing messages ---------------------*/

  struct endnode_hello_message {

  	__u8   msgflg;
  	__u8   tiver[3];
  	__u8   id[6];
  	__u8   iinfo;
  	__le16 blksize;
  	__u8   area;
  	__u8   seed[8];
  	__u8   neighbor[6];
  	__le16 timer;
  	__u8   mpd;
  	__u8   datalen;
  	__u8   data[2];

  } __packed;

  struct rtnode_hello_message {

  	__u8   msgflg;
  	__u8   tiver[3];
  	__u8   id[6];
  	__u8   iinfo;
  	__le16  blksize;
  	__u8   priority;
  	__u8   area;
  	__le16  timer;
  	__u8   mpd;

  } __packed;

  
  
  extern void dn_dev_init(void);
  extern void dn_dev_cleanup(void);
  
  extern int dn_dev_ioctl(unsigned int cmd, void __user *arg);
  
  extern void dn_dev_devices_off(void);
  extern void dn_dev_devices_on(void);
  
  extern void dn_dev_init_pkt(struct sk_buff *skb);
  extern void dn_dev_veri_pkt(struct sk_buff *skb);
  extern void dn_dev_hello(struct sk_buff *skb);
  
  extern void dn_dev_up(struct net_device *);
  extern void dn_dev_down(struct net_device *);
  
  extern int dn_dev_set_default(struct net_device *dev, int force);
  extern struct net_device *dn_dev_get_default(void);

  extern int dn_dev_bind_default(__le16 *addr);

  
  extern int register_dnaddr_notifier(struct notifier_block *nb);
  extern int unregister_dnaddr_notifier(struct notifier_block *nb);

  static inline int dn_dev_islocal(struct net_device *dev, __le16 addr)

  {

  	struct dn_dev *dn_db;

  	struct dn_ifaddr *ifa;

  	int res = 0;

  	rcu_read_lock();
  	dn_db = rcu_dereference(dev->dn_ptr);

  	if (dn_db == NULL) {
  		printk(KERN_DEBUG "dn_dev_islocal: Called for non DECnet device
  ");

  		goto out;

  	}

  	for (ifa = rcu_dereference(dn_db->ifa_list);
  	     ifa != NULL;
  	     ifa = rcu_dereference(ifa->ifa_next))
  		if ((addr ^ ifa->ifa_local) == 0) {
  			res = 1;
  			break;
  		}
  out:
  	rcu_read_unlock();
  	return res;

  }
  
  #endif /* _NET_DN_DEV_H */