drivers/staging/batman-adv/main.c

   1 /*
   2  * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "proc.h"
  24 #include "routing.h"
  25 #include "send.h"
  26 #include "originator.h"
  27 #include "soft-interface.h"
  28 #include "device.h"
  29 #include "translation-table.h"
  30 #include "hard-interface.h"
  31 #include "types.h"
  32 #include "vis.h"
  33 #include "hash.h"
  34
  35 struct list_head if_list;
  36 struct hlist_head forw_bat_list;
  37 struct hlist_head forw_bcast_list;
  38 struct hashtable_t *orig_hash;
  39
  40 DEFINE_SPINLOCK(orig_hash_lock);
  41 DEFINE_SPINLOCK(forw_bat_list_lock);
  42 DEFINE_SPINLOCK(forw_bcast_list_lock);
  43
  44 atomic_t originator_interval;
  45 atomic_t vis_interval;
  46 atomic_t vis_mode;
  47 atomic_t aggregation_enabled;
  48 int16_t num_hna;
  49 int16_t num_ifs;
  50
  51 struct net_device *soft_device;
  52
  53 unsigned char broadcastAddr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  54 atomic_t module_state;
  55
  56 static struct packet_type batman_adv_packet_type __read_mostly = {
  57         .type = __constant_htons(ETH_P_BATMAN),
  58         .func = batman_skb_recv,
  59 };
  60
  61 struct workqueue_struct *bat_event_workqueue;
  62
  63 #ifdef CONFIG_BATMAN_ADV_DEBUG
  64 int debug;
  65
  66 module_param(debug, int, 0644);
  67
  68 int bat_debug_type(int type)
  69 {
  70         return debug & type;
  71 }
  72 #endif
  73
  74 int init_module(void)
  75 {
  76         int retval;
  77
  78         INIT_LIST_HEAD(&if_list);
  79         INIT_HLIST_HEAD(&forw_bat_list);
  80         INIT_HLIST_HEAD(&forw_bcast_list);
  81
  82         atomic_set(&module_state, MODULE_INACTIVE);
  83
  84         atomic_set(&originator_interval, 1000);
  85         atomic_set(&vis_interval, 1000);/* TODO: raise this later, this is only
  86                                          * for debugging now. */
  87         atomic_set(&vis_mode, VIS_TYPE_CLIENT_UPDATE);
  88         atomic_set(&aggregation_enabled, 1);
  89
  90         /* the name should not be longer than 10 chars - see
  91          * http://lwn.net/Articles/23634/ */
  92         bat_event_workqueue = create_singlethread_workqueue("bat_events");
  93
  94         if (!bat_event_workqueue)
  95                 return -ENOMEM;
  96
  97         retval = setup_procfs();
  98         if (retval < 0)
  99                 return retval;
 100
 101         bat_device_init();
 102
 103         /* initialize layer 2 interface */
 104         soft_device = alloc_netdev(sizeof(struct bat_priv) , "bat%d",
 105                                    interface_setup);
 106
 107         if (!soft_device) {
 108                 printk(KERN_ERR "batman-adv:Unable to allocate the batman interface\n");
 109                 goto end;
 110         }
 111
 112         retval = register_netdev(soft_device);
 113
 114         if (retval < 0) {
 115                 printk(KERN_ERR "batman-adv:Unable to register the batman interface: %i\n", retval);
 116                 goto free_soft_device;
 117         }
 118
 119         register_netdevice_notifier(&hard_if_notifier);
 120         dev_add_pack(&batman_adv_packet_type);
 121
 122         printk(KERN_INFO "batman-adv:B.A.T.M.A.N. advanced %s%s (compatibility version %i) loaded \n",
 123                   SOURCE_VERSION, REVISION_VERSION_STR, COMPAT_VERSION);
 124
 125         return 0;
 126
 127 free_soft_device:
 128         free_netdev(soft_device);
 129         soft_device = NULL;
 130 end:
 131         return -ENOMEM;
 132 }
 133
 134 void cleanup_module(void)
 135 {
 136         shutdown_module();
 137
 138         if (soft_device) {
 139                 unregister_netdev(soft_device);
 140                 soft_device = NULL;
 141         }
 142
 143         dev_remove_pack(&batman_adv_packet_type);
 144
 145         unregister_netdevice_notifier(&hard_if_notifier);
 146         cleanup_procfs();
 147
 148         destroy_workqueue(bat_event_workqueue);
 149         bat_event_workqueue = NULL;
 150 }
 151
 152 /* activates the module, creates bat device, starts timer ... */
 153 void activate_module(void)
 154 {
 155         if (originator_init() < 1)
 156                 goto err;
 157
 158         if (hna_local_init() < 1)
 159                 goto err;
 160
 161         if (hna_global_init() < 1)
 162                 goto err;
 163
 164         hna_local_add(soft_device->dev_addr);
 165
 166         if (bat_device_setup() < 1)
 167                 goto end;
 168
 169         if (vis_init() < 1)
 170                 goto err;
 171
 172         update_min_mtu();
 173         atomic_set(&module_state, MODULE_ACTIVE);
 174         goto end;
 175
 176 err:
 177         printk(KERN_ERR "batman-adv:Unable to allocate memory for mesh information structures: out of mem ?\n");
 178         shutdown_module();
 179 end:
 180         return;
 181 }
 182
 183 /* shuts down the whole module.*/
 184 void shutdown_module(void)
 185 {
 186         atomic_set(&module_state, MODULE_DEACTIVATING);
 187
 188         purge_outstanding_packets();
 189         flush_workqueue(bat_event_workqueue);
 190
 191         vis_quit();
 192
 193         /* TODO: unregister BATMAN pack */
 194
 195         originator_free();
 196
 197         hna_local_free();
 198         hna_global_free();
 199
 200         synchronize_net();
 201         bat_device_destroy();
 202
 203         hardif_remove_interfaces();
 204         synchronize_rcu();
 205         atomic_set(&module_state, MODULE_INACTIVE);
 206 }
 207
 208 void inc_module_count(void)
 209 {
 210         try_module_get(THIS_MODULE);
 211 }
 212
 213 void dec_module_count(void)
 214 {
 215         module_put(THIS_MODULE);
 216 }
 217
 218 int addr_to_string(char *buff, uint8_t *addr)
 219 {
 220         return sprintf(buff, "%02x:%02x:%02x:%02x:%02x:%02x",
 221                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 222 }
 223
 224 /* returns 1 if they are the same originator */
 225
 226 int compare_orig(void *data1, void *data2)
 227 {
 228         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 229 }
 230
 231 /* hashfunction to choose an entry in a hash table of given size */
 232 /* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
 233 int choose_orig(void *data, int32_t size)
 234 {
 235         unsigned char *key = data;
 236         uint32_t hash = 0;
 237         size_t i;
 238
 239         for (i = 0; i < 6; i++) {
 240                 hash += key[i];
 241                 hash += (hash << 10);
 242                 hash ^= (hash >> 6);
 243         }
 244
 245         hash += (hash << 3);
 246         hash ^= (hash >> 11);
 247         hash += (hash << 15);
 248
 249         return hash % size;
 250 }
 251
 252 int is_my_mac(uint8_t *addr)
 253 {
 254         struct batman_if *batman_if;
 255         rcu_read_lock();
 256         list_for_each_entry_rcu(batman_if, &if_list, list) {
 257                 if ((batman_if->net_dev) &&
 258                     (compare_orig(batman_if->net_dev->dev_addr, addr))) {
 259                         rcu_read_unlock();
 260                         return 1;
 261                 }
 262         }
 263         rcu_read_unlock();
 264         return 0;
 265
 266 }
 267
 268 int is_bcast(uint8_t *addr)
 269 {
 270         return (addr[0] == (uint8_t)0xff) && (addr[1] == (uint8_t)0xff);
 271 }
 272
 273 int is_mcast(uint8_t *addr)
 274 {
 275         return *addr & 0x01;
 276 }
 277
 278 MODULE_LICENSE("GPL");
 279
 280 MODULE_AUTHOR(DRIVER_AUTHOR);
 281 MODULE_DESCRIPTION(DRIVER_DESC);
 282 MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
 283 #ifdef REVISION_VERSION
 284 MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION);
 285 #else
 286 MODULE_VERSION(SOURCE_VERSION);
 287 #endif