include/linux/atalk.h

   1 #ifndef __LINUX_ATALK_H__
   2 #define __LINUX_ATALK_H__
   3
   4 #include <asm/byteorder.h>
   5
   6 /*
   7  * AppleTalk networking structures
   8  *
   9  * The following are directly referenced from the University Of Michigan
  10  * netatalk for compatibility reasons.
  11  */
  12 #define ATPORT_FIRST    1
  13 #define ATPORT_RESERVED 128
  14 #define ATPORT_LAST     254             /* 254 is only legal on localtalk */
  15 #define ATADDR_ANYNET   (__u16)0
  16 #define ATADDR_ANYNODE  (__u8)0
  17 #define ATADDR_ANYPORT  (__u8)0
  18 #define ATADDR_BCAST    (__u8)255
  19 #define DDP_MAXSZ       587
  20 #define DDP_MAXHOPS     15              /* 4 bits of hop counter */
  21
  22 #define SIOCATALKDIFADDR       (SIOCPROTOPRIVATE + 0)
  23
  24 struct atalk_addr {
  25         __be16  s_net;
  26         __u8    s_node;
  27 };
  28
  29 struct sockaddr_at {
  30         sa_family_t       sat_family;
  31         __u8              sat_port;
  32         struct atalk_addr sat_addr;
  33         char              sat_zero[8];
  34 };
  35
  36 struct atalk_netrange {
  37         __u8    nr_phase;
  38         __be16  nr_firstnet;
  39         __be16  nr_lastnet;
  40 };
  41
  42 #ifdef __KERNEL__
  43
  44 #include <net/sock.h>
  45
  46 struct atalk_route {
  47         struct net_device  *dev;
  48         struct atalk_addr  target;
  49         struct atalk_addr  gateway;
  50         int                flags;
  51         struct atalk_route *next;
  52 };
  53
  54 /**
  55  *      struct atalk_iface - AppleTalk Interface
  56  *      @dev - Network device associated with this interface
  57  *      @address - Our address
  58  *      @status - What are we doing?
  59  *      @nets - Associated direct netrange
  60  *      @next - next element in the list of interfaces
  61  */
  62 struct atalk_iface {
  63         struct net_device       *dev;
  64         struct atalk_addr       address;
  65         int                     status;
  66 #define ATIF_PROBE      1               /* Probing for an address */
  67 #define ATIF_PROBE_FAIL 2               /* Probe collided */
  68         struct atalk_netrange   nets;
  69         struct atalk_iface      *next;
  70 };
  71
  72 struct atalk_sock {
  73         /* struct sock has to be the first member of atalk_sock */
  74         struct sock     sk;
  75         __be16          dest_net;
  76         __be16          src_net;
  77         unsigned char   dest_node;
  78         unsigned char   src_node;
  79         unsigned char   dest_port;
  80         unsigned char   src_port;
  81 };
  82
  83 static inline struct atalk_sock *at_sk(struct sock *sk)
  84 {
  85         return (struct atalk_sock *)sk;
  86 }
  87
  88 struct ddpehdr {
  89         __be16  deh_len_hops;   /* lower 10 bits are length, next 4 - hops */
  90         __be16  deh_sum;
  91         __be16  deh_dnet;
  92         __be16  deh_snet;
  93         __u8    deh_dnode;
  94         __u8    deh_snode;
  95         __u8    deh_dport;
  96         __u8    deh_sport;
  97         /* And netatalk apps expect to stick the type in themselves */
  98 };
  99
 100 static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
 101 {
 102         return (struct ddpehdr *)skb_transport_header(skb);
 103 }
 104
 105 /* AppleTalk AARP headers */
 106 struct elapaarp {
 107         __be16  hw_type;
 108 #define AARP_HW_TYPE_ETHERNET           1
 109 #define AARP_HW_TYPE_TOKENRING          2
 110         __be16  pa_type;
 111         __u8    hw_len;
 112         __u8    pa_len;
 113 #define AARP_PA_ALEN                    4
 114         __be16  function;
 115 #define AARP_REQUEST                    1
 116 #define AARP_REPLY                      2
 117 #define AARP_PROBE                      3
 118         __u8    hw_src[ETH_ALEN];
 119         __u8    pa_src_zero;
 120         __be16  pa_src_net;
 121         __u8    pa_src_node;
 122         __u8    hw_dst[ETH_ALEN];
 123         __u8    pa_dst_zero;
 124         __be16  pa_dst_net;
 125         __u8    pa_dst_node;
 126 } __attribute__ ((packed));
 127
 128 static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
 129 {
 130         return (struct elapaarp *)skb_transport_header(skb);
 131 }
 132
 133 /* Not specified - how long till we drop a resolved entry */
 134 #define AARP_EXPIRY_TIME        (5 * 60 * HZ)
 135 /* Size of hash table */
 136 #define AARP_HASH_SIZE          16
 137 /* Fast retransmission timer when resolving */
 138 #define AARP_TICK_TIME          (HZ / 5)
 139 /* Send 10 requests then give up (2 seconds) */
 140 #define AARP_RETRANSMIT_LIMIT   10
 141 /*
 142  * Some value bigger than total retransmit time + a bit for last reply to
 143  * appear and to stop continual requests
 144  */
 145 #define AARP_RESOLVE_TIME       (10 * HZ)
 146
 147 extern struct datalink_proto *ddp_dl, *aarp_dl;
 148 extern void aarp_proto_init(void);
 149
 150 /* Inter module exports */
 151
 152 /* Give a device find its atif control structure */
 153 static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
 154 {
 155         return dev->atalk_ptr;
 156 }
 157
 158 extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
 159 extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
 160 extern int               aarp_send_ddp(struct net_device *dev,
 161                                        struct sk_buff *skb,
 162                                        struct atalk_addr *sa, void *hwaddr);
 163 extern void              aarp_device_down(struct net_device *dev);
 164 extern void              aarp_probe_network(struct atalk_iface *atif);
 165 extern int               aarp_proxy_probe_network(struct atalk_iface *atif,
 166                                      struct atalk_addr *sa);
 167 extern void              aarp_proxy_remove(struct net_device *dev,
 168                                            struct atalk_addr *sa);
 169
 170 extern void             aarp_cleanup_module(void);
 171
 172 extern struct hlist_head atalk_sockets;
 173 extern rwlock_t atalk_sockets_lock;
 174
 175 extern struct atalk_route *atalk_routes;
 176 extern rwlock_t atalk_routes_lock;
 177
 178 extern struct atalk_iface *atalk_interfaces;
 179 extern rwlock_t atalk_interfaces_lock;
 180
 181 extern struct atalk_route atrtr_default;
 182
 183 extern const struct file_operations atalk_seq_arp_fops;
 184
 185 extern int sysctl_aarp_expiry_time;
 186 extern int sysctl_aarp_tick_time;
 187 extern int sysctl_aarp_retransmit_limit;
 188 extern int sysctl_aarp_resolve_time;
 189
 190 #ifdef CONFIG_SYSCTL
 191 extern void atalk_register_sysctl(void);
 192 extern void atalk_unregister_sysctl(void);
 193 #else
 194 #define atalk_register_sysctl()         do { } while(0)
 195 #define atalk_unregister_sysctl()       do { } while(0)
 196 #endif
 197
 198 #ifdef CONFIG_PROC_FS
 199 extern int atalk_proc_init(void);
 200 extern void atalk_proc_exit(void);
 201 #else
 202 #define atalk_proc_init()       ({ 0; })
 203 #define atalk_proc_exit()       do { } while(0)
 204 #endif /* CONFIG_PROC_FS */
 205
 206 #endif /* __KERNEL__ */
 207 #endif /* __LINUX_ATALK_H__ */