#ifndef __LINUX_ATALK_H__
  #define __LINUX_ATALK_H__

  #include <linux/types.h>

  #include <asm/byteorder.h>

  #include <linux/socket.h>

  /*
   * AppleTalk networking structures
   *
   * The following are directly referenced from the University Of Michigan
   * netatalk for compatibility reasons.
   */
  #define ATPORT_FIRST	1
  #define ATPORT_RESERVED	128
  #define ATPORT_LAST	254		/* 254 is only legal on localtalk */ 
  #define ATADDR_ANYNET	(__u16)0
  #define ATADDR_ANYNODE	(__u8)0
  #define ATADDR_ANYPORT  (__u8)0
  #define ATADDR_BCAST	(__u8)255
  #define DDP_MAXSZ	587
  #define DDP_MAXHOPS     15		/* 4 bits of hop counter */
  
  #define SIOCATALKDIFADDR       (SIOCPROTOPRIVATE + 0)
  
  struct atalk_addr {

  	__be16	s_net;

  	__u8	s_node;
  };
  
  struct sockaddr_at {

  	__kernel_sa_family_t sat_family;

  	__u8		  sat_port;
  	struct atalk_addr sat_addr;
  	char		  sat_zero[8];
  };
  
  struct atalk_netrange {
  	__u8	nr_phase;

  	__be16	nr_firstnet;
  	__be16	nr_lastnet;

  };

  #ifdef __KERNEL__
  
  #include <net/sock.h>

  struct atalk_route {
  	struct net_device  *dev;
  	struct atalk_addr  target;
  	struct atalk_addr  gateway;
  	int		   flags;
  	struct atalk_route *next;
  };
  
  /**
   *	struct atalk_iface - AppleTalk Interface
   *	@dev - Network device associated with this interface
   *	@address - Our address
   *	@status - What are we doing?
   *	@nets - Associated direct netrange
   *	@next - next element in the list of interfaces
   */
  struct atalk_iface {
  	struct net_device	*dev;
  	struct atalk_addr	address;
  	int			status;
  #define ATIF_PROBE	1		/* Probing for an address */
  #define ATIF_PROBE_FAIL	2		/* Probe collided */
  	struct atalk_netrange	nets;
  	struct atalk_iface	*next;
  };
  	
  struct atalk_sock {
  	/* struct sock has to be the first member of atalk_sock */
  	struct sock	sk;

  	__be16		dest_net;
  	__be16		src_net;

  	unsigned char	dest_node;
  	unsigned char	src_node;
  	unsigned char	dest_port;
  	unsigned char	src_port;
  };
  
  static inline struct atalk_sock *at_sk(struct sock *sk)
  {
  	return (struct atalk_sock *)sk;
  }

  struct ddpehdr {

  	__be16	deh_len_hops;	/* lower 10 bits are length, next 4 - hops */

  	__be16	deh_sum;
  	__be16	deh_dnet;
  	__be16	deh_snet;

  	__u8	deh_dnode;
  	__u8	deh_snode;
  	__u8	deh_dport;
  	__u8	deh_sport;
  	/* And netatalk apps expect to stick the type in themselves */
  };
  
  static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
  {

  	return (struct ddpehdr *)skb_transport_header(skb);

  }

  /* AppleTalk AARP headers */
  struct elapaarp {

  	__be16	hw_type;

  #define AARP_HW_TYPE_ETHERNET		1
  #define AARP_HW_TYPE_TOKENRING		2

  	__be16	pa_type;

  	__u8	hw_len;
  	__u8	pa_len;
  #define AARP_PA_ALEN			4

  	__be16	function;

  #define AARP_REQUEST			1
  #define AARP_REPLY			2
  #define AARP_PROBE			3

  	__u8	hw_src[ETH_ALEN];
  	__u8	pa_src_zero;
  	__be16	pa_src_net;
  	__u8	pa_src_node;
  	__u8	hw_dst[ETH_ALEN];
  	__u8	pa_dst_zero;
  	__be16	pa_dst_net;
  	__u8	pa_dst_node;
  } __attribute__ ((packed));

  
  static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
  {

  	return (struct elapaarp *)skb_transport_header(skb);

  }
  
  /* Not specified - how long till we drop a resolved entry */
  #define AARP_EXPIRY_TIME	(5 * 60 * HZ)
  /* Size of hash table */
  #define AARP_HASH_SIZE		16
  /* Fast retransmission timer when resolving */
  #define AARP_TICK_TIME		(HZ / 5)
  /* Send 10 requests then give up (2 seconds) */
  #define AARP_RETRANSMIT_LIMIT	10
  /*
   * Some value bigger than total retransmit time + a bit for last reply to
   * appear and to stop continual requests
   */
  #define AARP_RESOLVE_TIME	(10 * HZ)
  
  extern struct datalink_proto *ddp_dl, *aarp_dl;
  extern void aarp_proto_init(void);
  
  /* Inter module exports */
  
  /* Give a device find its atif control structure */
  static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
  {
  	return dev->atalk_ptr;
  }
  
  extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
  extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
  extern int		 aarp_send_ddp(struct net_device *dev,
  				       struct sk_buff *skb,
  				       struct atalk_addr *sa, void *hwaddr);
  extern void		 aarp_device_down(struct net_device *dev);
  extern void		 aarp_probe_network(struct atalk_iface *atif);
  extern int 		 aarp_proxy_probe_network(struct atalk_iface *atif,
  				     struct atalk_addr *sa);
  extern void		 aarp_proxy_remove(struct net_device *dev,
  					   struct atalk_addr *sa);
  
  extern void		aarp_cleanup_module(void);
  
  extern struct hlist_head atalk_sockets;
  extern rwlock_t atalk_sockets_lock;
  
  extern struct atalk_route *atalk_routes;
  extern rwlock_t atalk_routes_lock;
  
  extern struct atalk_iface *atalk_interfaces;
  extern rwlock_t atalk_interfaces_lock;
  
  extern struct atalk_route atrtr_default;

  extern const struct file_operations atalk_seq_arp_fops;

  
  extern int sysctl_aarp_expiry_time;
  extern int sysctl_aarp_tick_time;
  extern int sysctl_aarp_retransmit_limit;
  extern int sysctl_aarp_resolve_time;
  
  #ifdef CONFIG_SYSCTL
  extern void atalk_register_sysctl(void);
  extern void atalk_unregister_sysctl(void);
  #else
  #define atalk_register_sysctl()		do { } while(0)
  #define atalk_unregister_sysctl()	do { } while(0)
  #endif
  
  #ifdef CONFIG_PROC_FS
  extern int atalk_proc_init(void);
  extern void atalk_proc_exit(void);
  #else
  #define atalk_proc_init()	({ 0; })
  #define atalk_proc_exit()	do { } while(0)
  #endif /* CONFIG_PROC_FS */
  
  #endif /* __KERNEL__ */
  #endif /* __LINUX_ATALK_H__ */