root/include/linux/atalk.h

INCLUDED FROM

DEFINITIONS

1. at_sk
2. ddp_hdr
3. aarp_hdr
4. atalk_find_dev

#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 - 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 /* __LINUX_ATALK_H__ */