include/linux/atalk.h

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