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#ifndef __LINUX_ATALK_H__
#define __LINUX_ATALK_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 {
        __u16   s_net;
        __u8    s_node;
};

struct sockaddr_at {
        sa_family_t       sat_family;
        __u8              sat_port;
        struct atalk_addr sat_addr;
        char              sat_zero[8];
};

struct atalk_netrange {
        __u8    nr_phase;
        __u16   nr_firstnet;
        __u16   nr_lastnet;
};

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 {
        unsigned short  dest_net;
        unsigned short  src_net;
        unsigned char   dest_node;
        unsigned char   src_node;
        unsigned char   dest_port;
        unsigned char   src_port;
};

#ifdef __KERNEL__

#include <asm/byteorder.h>

struct ddpehdr {
#ifdef __LITTLE_ENDIAN_BITFIELD
        __u16   deh_len:10,
                deh_hops:4,
                deh_pad:2;
#else
        __u16   deh_pad:2,
                deh_hops:4,
                deh_len:10;
#endif
        __u16   deh_sum;
        __u16   deh_dnet;
        __u16   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->h.raw;
}

/*
 *      Don't drop the struct into the struct above.  You'll get some
 *      surprise padding.
 */
struct ddpebits {
#ifdef __LITTLE_ENDIAN_BITFIELD
        __u16   deh_len:10,
                deh_hops:4,
                deh_pad:2;
#else
        __u16   deh_pad:2,
                deh_hops:4,
                deh_len:10;
#endif
};

/* Short form header */
struct ddpshdr {
#ifdef __LITTLE_ENDIAN_BITFIELD
        __u16   dsh_len:10,
                dsh_pad:6;
#else
        __u16   dsh_pad:6,
                dsh_len:10;
#endif
        __u8    dsh_dport;
        __u8    dsh_sport;
        /* And netatalk apps expect to stick the type in themselves */
};

/* AppleTalk AARP headers */
struct elapaarp {
        __u16   hw_type;
#define AARP_HW_TYPE_ETHERNET           1
#define AARP_HW_TYPE_TOKENRING          2
        __u16   pa_type;
        __u8    hw_len;
        __u8    pa_len;
#define AARP_PA_ALEN                    4
        __u16   function;
#define AARP_REQUEST                    1
#define AARP_REPLY                      2
#define AARP_PROBE                      3
        __u8    hw_src[ETH_ALEN]        __attribute__ ((packed));
        __u8    pa_src_zero             __attribute__ ((packed));
        __u16   pa_src_net              __attribute__ ((packed));
        __u8    pa_src_node             __attribute__ ((packed));
        __u8    hw_dst[ETH_ALEN]        __attribute__ ((packed));
        __u8    pa_dst_zero             __attribute__ ((packed));
        __u16   pa_dst_net              __attribute__ ((packed));
        __u8    pa_dst_node             __attribute__ ((packed));      
};

static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
{
        return (struct elapaarp *)skb->h.raw;
}

/* 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_send_probe(struct net_device *dev,
                                         struct atalk_addr *addr);
extern void              aarp_device_down(struct net_device *dev);

#ifdef MODULE
extern void aarp_cleanup_module(void);
#endif /* MODULE */

#define at_sk(__sk) ((struct atalk_sock *)(__sk)->sk_protinfo)

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 int atalk_proc_init(void);
extern void atalk_proc_exit(void);

#endif /* __KERNEL__ */
#endif /* __LINUX_ATALK_H__ */