atalk.h

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#ifndef __LINUX_ATALK_H__
#define __LINUX_ATALK_H__


#include <net/sock.h>
#include <uapi/linux/atalk.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 {
    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 /* __LINUX_ATALK_H__ */