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 "bat_sysfs.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 bcast_queue_left;
  45 atomic_t batman_queue_left;
  46
  47 int16_t num_hna;
  48
  49 struct net_device *soft_device;
  50
  51 unsigned char broadcastAddr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  52 atomic_t module_state;
  53
  54 static struct packet_type batman_adv_packet_type __read_mostly = {
  55         .type = __constant_htons(ETH_P_BATMAN),
  56         .func = batman_skb_recv,
  57 };
  58
  59 struct workqueue_struct *bat_event_workqueue;
  60
  61 #ifdef CONFIG_BATMAN_ADV_DEBUG
  62 int debug;
  63
  64 module_param(debug, int, 0644);
  65
  66 int bat_debug_type(int type)
  67 {
  68         return debug & type;
  69 }
  70 #endif
  71
  72 int init_module(void)
  73 {
  74         int retval;
  75
  76         INIT_LIST_HEAD(&if_list);
  77         INIT_HLIST_HEAD(&forw_bat_list);
  78         INIT_HLIST_HEAD(&forw_bcast_list);
  79
  80         atomic_set(&module_state, MODULE_INACTIVE);
  81
  82         atomic_set(&bcast_queue_left, BCAST_QUEUE_LEN);
  83         atomic_set(&batman_queue_left, BATMAN_QUEUE_LEN);
  84
  85         /* the name should not be longer than 10 chars - see
  86          * http://lwn.net/Articles/23634/ */
  87         bat_event_workqueue = create_singlethread_workqueue("bat_events");
  88
  89         if (!bat_event_workqueue)
  90                 return -ENOMEM;
  91
  92         bat_device_init();
  93
  94         /* initialize layer 2 interface */
  95         soft_device = alloc_netdev(sizeof(struct bat_priv) , "bat%d",
  96                                    interface_setup);
  97
  98         if (!soft_device) {
  99                 printk(KERN_ERR "batman-adv:"
 100                        "Unable to allocate the batman interface\n");
 101                 goto end;
 102         }
 103
 104         retval = register_netdev(soft_device);
 105
 106         if (retval < 0) {
 107                 printk(KERN_ERR "batman-adv:"
 108                        "Unable to register the batman interface: %i\n", retval);
 109                 goto free_soft_device;
 110         }
 111
 112         retval = sysfs_add_meshif(soft_device);
 113
 114         if (retval < 0)
 115                 goto unreg_soft_device;
 116
 117         register_netdevice_notifier(&hard_if_notifier);
 118         dev_add_pack(&batman_adv_packet_type);
 119
 120         printk(KERN_INFO "batman-adv:"
 121                "B.A.T.M.A.N. advanced %s%s (compatibility version %i) loaded\n",
 122                SOURCE_VERSION, REVISION_VERSION_STR, COMPAT_VERSION);
 123
 124         return 0;
 125
 126 unreg_soft_device:
 127         unregister_netdev(soft_device);
 128         soft_device = NULL;
 129         return -ENOMEM;
 130
 131 free_soft_device:
 132         free_netdev(soft_device);
 133         soft_device = NULL;
 134 end:
 135         return -ENOMEM;
 136 }
 137
 138 void cleanup_module(void)
 139 {
 140         deactivate_module();
 141
 142         unregister_netdevice_notifier(&hard_if_notifier);
 143         hardif_remove_interfaces();
 144
 145         if (soft_device) {
 146                 sysfs_del_meshif(soft_device);
 147                 unregister_netdev(soft_device);
 148                 soft_device = NULL;
 149         }
 150
 151         dev_remove_pack(&batman_adv_packet_type);
 152
 153         destroy_workqueue(bat_event_workqueue);
 154         bat_event_workqueue = NULL;
 155 }
 156
 157 /* activates the module, creates bat device, starts timer ... */
 158 void activate_module(void)
 159 {
 160         if (originator_init() < 1)
 161                 goto err;
 162
 163         if (hna_local_init() < 1)
 164                 goto err;
 165
 166         if (hna_global_init() < 1)
 167                 goto err;
 168
 169         hna_local_add(soft_device->dev_addr);
 170
 171         if (bat_device_setup() < 1)
 172                 goto end;
 173
 174         if (vis_init() < 1)
 175                 goto err;
 176
 177         update_min_mtu();
 178         atomic_set(&module_state, MODULE_ACTIVE);
 179         goto end;
 180
 181 err:
 182         printk(KERN_ERR "batman-adv:"
 183                "Unable to allocate memory for mesh information structures: "
 184                "out of mem ?\n");
 185         deactivate_module();
 186 end:
 187         return;
 188 }
 189
 190 /* shuts down the whole module.*/
 191 void deactivate_module(void)
 192 {
 193         atomic_set(&module_state, MODULE_DEACTIVATING);
 194
 195         purge_outstanding_packets(NULL);
 196         flush_workqueue(bat_event_workqueue);
 197
 198         vis_quit();
 199
 200         /* TODO: unregister BATMAN pack */
 201
 202         originator_free();
 203
 204         hna_local_free();
 205         hna_global_free();
 206
 207         synchronize_net();
 208         bat_device_destroy();
 209
 210         synchronize_rcu();
 211         atomic_set(&module_state, MODULE_INACTIVE);
 212 }
 213
 214 void inc_module_count(void)
 215 {
 216         try_module_get(THIS_MODULE);
 217 }
 218
 219 void dec_module_count(void)
 220 {
 221         module_put(THIS_MODULE);
 222 }
 223
 224 int addr_to_string(char *buff, uint8_t *addr)
 225 {
 226         return sprintf(buff, MAC_FMT,
 227                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 228 }
 229
 230 /* returns 1 if they are the same originator */
 231
 232 int compare_orig(void *data1, void *data2)
 233 {
 234         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 235 }
 236
 237 /* hashfunction to choose an entry in a hash table of given size */
 238 /* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
 239 int choose_orig(void *data, int32_t size)
 240 {
 241         unsigned char *key = data;
 242         uint32_t hash = 0;
 243         size_t i;
 244
 245         for (i = 0; i < 6; i++) {
 246                 hash += key[i];
 247                 hash += (hash << 10);
 248                 hash ^= (hash >> 6);
 249         }
 250
 251         hash += (hash << 3);
 252         hash ^= (hash >> 11);
 253         hash += (hash << 15);
 254
 255         return hash % size;
 256 }
 257
 258 int is_my_mac(uint8_t *addr)
 259 {
 260         struct batman_if *batman_if;
 261         rcu_read_lock();
 262         list_for_each_entry_rcu(batman_if, &if_list, list) {
 263                 if ((batman_if->net_dev) &&
 264                     (compare_orig(batman_if->net_dev->dev_addr, addr))) {
 265                         rcu_read_unlock();
 266                         return 1;
 267                 }
 268         }
 269         rcu_read_unlock();
 270         return 0;
 271
 272 }
 273
 274 int is_bcast(uint8_t *addr)
 275 {
 276         return (addr[0] == (uint8_t)0xff) && (addr[1] == (uint8_t)0xff);
 277 }
 278
 279 int is_mcast(uint8_t *addr)
 280 {
 281         return *addr & 0x01;
 282 }
 283
 284 MODULE_LICENSE("GPL");
 285
 286 MODULE_AUTHOR(DRIVER_AUTHOR);
 287 MODULE_DESCRIPTION(DRIVER_DESC);
 288 MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
 289 #ifdef REVISION_VERSION
 290 MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION);
 291 #else
 292 MODULE_VERSION(SOURCE_VERSION);
 293 #endif