include/linux/atalk.h

   1 #ifndef __LINUX_ATALK_H__
   2 #define __LINUX_ATALK_H__
   3
   4 /*
   5  * AppleTalk networking structures
   6  *
   7  * The following are directly referenced from the University Of Michigan
   8  * netatalk for compatibility reasons.
   9  */
  10 #define ATPORT_FIRST    1
  11 #define ATPORT_RESERVED 128
  12 #define ATPORT_LAST     254             /* 254 is only legal on localtalk */
  13 #define ATADDR_ANYNET   (__u16)0
  14 #define ATADDR_ANYNODE  (__u8)0
  15 #define ATADDR_ANYPORT  (__u8)0
  16 #define ATADDR_BCAST    (__u8)255
  17 #define DDP_MAXSZ       587
  18 #define DDP_MAXHOPS     15              /* 4 bits of hop counter */
  19
  20 #define SIOCATALKDIFADDR       (SIOCPROTOPRIVATE + 0)
  21
  22 struct atalk_addr {
  23         __be16  s_net;
  24         __u8    s_node;
  25 };
  26
  27 struct sockaddr_at {
  28         sa_family_t       sat_family;
  29         __u8              sat_port;
  30         struct atalk_addr sat_addr;
  31         char              sat_zero[8];
  32 };
  33
  34 struct atalk_netrange {
  35         __u8    nr_phase;
  36         __be16  nr_firstnet;
  37         __be16  nr_lastnet;
  38 };
  39
  40 #ifdef __KERNEL__
  41
  42 #include <net/sock.h>
  43
  44 struct atalk_route {
  45         struct net_device  *dev;
  46         struct atalk_addr  target;
  47         struct atalk_addr  gateway;
  48         int                flags;
  49         struct atalk_route *next;
  50 };
  51
  52 /**
  53  *      struct atalk_iface - AppleTalk Interface
  54  *      @dev - Network device associated with this interface
  55  *      @address - Our address
  56  *      @status - What are we doing?
  57  *      @nets - Associated direct netrange
  58  *      @next - next element in the list of interfaces
  59  */
  60 struct atalk_iface {
  61         struct net_device       *dev;
  62         struct atalk_addr       address;
  63         int                     status;
  64 #define ATIF_PROBE      1               /* Probing for an address */
  65 #define ATIF_PROBE_FAIL 2               /* Probe collided */
  66         struct atalk_netrange   nets;
  67         struct atalk_iface      *next;
  68 };
  69
  70 struct atalk_sock {
  71         /* struct sock has to be the first member of atalk_sock */
  72         struct sock     sk;
  73         __be16          dest_net;
  74         __be16          src_net;
  75         unsigned char   dest_node;
  76         unsigned char   src_node;
  77         unsigned char   dest_port;
  78         unsigned char   src_port;
  79 };
  80
  81 static inline struct atalk_sock *at_sk(struct sock *sk)
  82 {
  83         return (struct atalk_sock *)sk;
  84 }
  85
  86 #include <asm/byteorder.h>
  87
  88 struct ddpehdr {
  89 #ifdef __LITTLE_ENDIAN_BITFIELD
  90         __u16   deh_len:10,
  91                 deh_hops:4,
  92                 deh_pad:2;
  93 #else
  94         __u16   deh_pad:2,
  95                 deh_hops:4,
  96                 deh_len:10;
  97 #endif
  98         __be16  deh_sum;
  99         __be16  deh_dnet;
 100         __be16  deh_snet;
 101         __u8    deh_dnode;
 102         __u8    deh_snode;
 103         __u8    deh_dport;
 104         __u8    deh_sport;
 105         /* And netatalk apps expect to stick the type in themselves */
 106 };
 107
 108 static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
 109 {
 110         return (struct ddpehdr *)skb->h.raw;
 111 }
 112
 113 /*
 114  *      Don't drop the struct into the struct above.  You'll get some
 115  *      surprise padding.
 116  */
 117 struct ddpebits {
 118 #ifdef __LITTLE_ENDIAN_BITFIELD
 119         __u16   deh_len:10,
 120                 deh_hops:4,
 121                 deh_pad:2;
 122 #else
 123         __u16   deh_pad:2,
 124                 deh_hops:4,
 125                 deh_len:10;
 126 #endif
 127 };
 128
 129 /* Short form header */
 130 struct ddpshdr {
 131 #ifdef __LITTLE_ENDIAN_BITFIELD
 132         __u16   dsh_len:10,
 133                 dsh_pad:6;
 134 #else
 135         __u16   dsh_pad:6,
 136                 dsh_len:10;
 137 #endif
 138         __u8    dsh_dport;
 139         __u8    dsh_sport;
 140         /* And netatalk apps expect to stick the type in themselves */
 141 };
 142
 143 /* AppleTalk AARP headers */
 144 struct elapaarp {
 145         __be16  hw_type;
 146 #define AARP_HW_TYPE_ETHERNET           1
 147 #define AARP_HW_TYPE_TOKENRING          2
 148         __be16  pa_type;
 149         __u8    hw_len;
 150         __u8    pa_len;
 151 #define AARP_PA_ALEN                    4
 152         __be16  function;
 153 #define AARP_REQUEST                    1
 154 #define AARP_REPLY                      2
 155 #define AARP_PROBE                      3
 156         __u8    hw_src[ETH_ALEN]        __attribute__ ((packed));
 157         __u8    pa_src_zero             __attribute__ ((packed));
 158         __be16  pa_src_net              __attribute__ ((packed));
 159         __u8    pa_src_node             __attribute__ ((packed));
 160         __u8    hw_dst[ETH_ALEN]        __attribute__ ((packed));
 161         __u8    pa_dst_zero             __attribute__ ((packed));
 162         __be16  pa_dst_net              __attribute__ ((packed));
 163         __u8    pa_dst_node             __attribute__ ((packed));
 164 };
 165
 166 static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
 167 {
 168         return (struct elapaarp *)skb->h.raw;
 169 }
 170
 171 /* Not specified - how long till we drop a resolved entry */
 172 #define AARP_EXPIRY_TIME        (5 * 60 * HZ)
 173 /* Size of hash table */
 174 #define AARP_HASH_SIZE          16
 175 /* Fast retransmission timer when resolving */
 176 #define AARP_TICK_TIME          (HZ / 5)
 177 /* Send 10 requests then give up (2 seconds) */
 178 #define AARP_RETRANSMIT_LIMIT   10
 179 /*
 180  * Some value bigger than total retransmit time + a bit for last reply to
 181  * appear and to stop continual requests
 182  */
 183 #define AARP_RESOLVE_TIME       (10 * HZ)
 184
 185 extern struct datalink_proto *ddp_dl, *aarp_dl;
 186 extern void aarp_proto_init(void);
 187
 188 /* Inter module exports */
 189
 190 /* Give a device find its atif control structure */
 191 static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
 192 {
 193         return dev->atalk_ptr;
 194 }
 195
 196 extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
 197 extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
 198 extern int               aarp_send_ddp(struct net_device *dev,
 199                                        struct sk_buff *skb,
 200                                        struct atalk_addr *sa, void *hwaddr);
 201 extern void              aarp_device_down(struct net_device *dev);
 202 extern void              aarp_probe_network(struct atalk_iface *atif);
 203 extern int               aarp_proxy_probe_network(struct atalk_iface *atif,
 204                                      struct atalk_addr *sa);
 205 extern void              aarp_proxy_remove(struct net_device *dev,
 206                                            struct atalk_addr *sa);
 207
 208 extern void             aarp_cleanup_module(void);
 209
 210 extern struct hlist_head atalk_sockets;
 211 extern rwlock_t atalk_sockets_lock;
 212
 213 extern struct atalk_route *atalk_routes;
 214 extern rwlock_t atalk_routes_lock;
 215
 216 extern struct atalk_iface *atalk_interfaces;
 217 extern rwlock_t atalk_interfaces_lock;
 218
 219 extern struct atalk_route atrtr_default;
 220
 221 extern struct file_operations atalk_seq_arp_fops;
 222
 223 extern int sysctl_aarp_expiry_time;
 224 extern int sysctl_aarp_tick_time;
 225 extern int sysctl_aarp_retransmit_limit;
 226 extern int sysctl_aarp_resolve_time;
 227
 228 #ifdef CONFIG_SYSCTL
 229 extern void atalk_register_sysctl(void);
 230 extern void atalk_unregister_sysctl(void);
 231 #else
 232 #define atalk_register_sysctl()         do { } while(0)
 233 #define atalk_unregister_sysctl()       do { } while(0)
 234 #endif
 235
 236 #ifdef CONFIG_PROC_FS
 237 extern int atalk_proc_init(void);
 238 extern void atalk_proc_exit(void);
 239 #else
 240 #define atalk_proc_init()       ({ 0; })
 241 #define atalk_proc_exit()       do { } while(0)
 242 #endif /* CONFIG_PROC_FS */
 243
 244 #endif /* __KERNEL__ */
 245 #endif /* __LINUX_ATALK_H__ */