release/src-rt-6.x.4708/linux/linux-2.6.36/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 "bat_debugfs.h"
  25 #include "routing.h"
  26 #include "send.h"
  27 #include "originator.h"
  28 #include "soft-interface.h"
  29 #include "icmp_socket.h"
  30 #include "translation-table.h"
  31 #include "hard-interface.h"
  32 #include "types.h"
  33 #include "vis.h"
  34 #include "hash.h"
  35
  36 struct list_head if_list;
  37 struct hlist_head forw_bat_list;
  38 struct hlist_head forw_bcast_list;
  39 struct hashtable_t *orig_hash;
  40
  41 DEFINE_SPINLOCK(orig_hash_lock);
  42 DEFINE_SPINLOCK(forw_bat_list_lock);
  43 DEFINE_SPINLOCK(forw_bcast_list_lock);
  44
  45 atomic_t bcast_queue_left;
  46 atomic_t batman_queue_left;
  47
  48 int16_t num_hna;
  49
  50 struct net_device *soft_device;
  51
  52 unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  53 atomic_t module_state;
  54
  55 static struct packet_type batman_adv_packet_type __read_mostly = {
  56         .type = __constant_htons(ETH_P_BATMAN),
  57         .func = batman_skb_recv,
  58 };
  59
  60 struct workqueue_struct *bat_event_workqueue;
  61
  62 static int __init batman_init(void)
  63 {
  64         int retval;
  65
  66         INIT_LIST_HEAD(&if_list);
  67         INIT_HLIST_HEAD(&forw_bat_list);
  68         INIT_HLIST_HEAD(&forw_bcast_list);
  69
  70         atomic_set(&module_state, MODULE_INACTIVE);
  71
  72         atomic_set(&bcast_queue_left, BCAST_QUEUE_LEN);
  73         atomic_set(&batman_queue_left, BATMAN_QUEUE_LEN);
  74
  75         /* the name should not be longer than 10 chars - see
  76          * http://lwn.net/Articles/23634/ */
  77         bat_event_workqueue = create_singlethread_workqueue("bat_events");
  78
  79         if (!bat_event_workqueue)
  80                 return -ENOMEM;
  81
  82         bat_socket_init();
  83         debugfs_init();
  84
  85         /* initialize layer 2 interface */
  86         soft_device = alloc_netdev(sizeof(struct bat_priv) , "bat%d",
  87                                    interface_setup);
  88
  89         if (!soft_device) {
  90                 pr_err("Unable to allocate the batman interface\n");
  91                 goto end;
  92         }
  93
  94         retval = register_netdev(soft_device);
  95
  96         if (retval < 0) {
  97                 pr_err("Unable to register the batman interface: %i\n", retval);
  98                 goto free_soft_device;
  99         }
 100
 101         retval = sysfs_add_meshif(soft_device);
 102
 103         if (retval < 0)
 104                 goto unreg_soft_device;
 105
 106         retval = debugfs_add_meshif(soft_device);
 107
 108         if (retval < 0)
 109                 goto unreg_sysfs;
 110
 111         register_netdevice_notifier(&hard_if_notifier);
 112         dev_add_pack(&batman_adv_packet_type);
 113
 114         pr_info("B.A.T.M.A.N. advanced %s%s (compatibility version %i) "
 115                 "loaded\n", SOURCE_VERSION, REVISION_VERSION_STR,
 116                 COMPAT_VERSION);
 117
 118         return 0;
 119
 120 unreg_sysfs:
 121         sysfs_del_meshif(soft_device);
 122 unreg_soft_device:
 123         unregister_netdev(soft_device);
 124         soft_device = NULL;
 125         return -ENOMEM;
 126
 127 free_soft_device:
 128         free_netdev(soft_device);
 129         soft_device = NULL;
 130 end:
 131         return -ENOMEM;
 132 }
 133
 134 static void __exit batman_exit(void)
 135 {
 136         deactivate_module();
 137
 138         debugfs_destroy();
 139         unregister_netdevice_notifier(&hard_if_notifier);
 140         hardif_remove_interfaces();
 141
 142         if (soft_device) {
 143                 debugfs_del_meshif(soft_device);
 144                 sysfs_del_meshif(soft_device);
 145                 unregister_netdev(soft_device);
 146                 soft_device = NULL;
 147         }
 148
 149         dev_remove_pack(&batman_adv_packet_type);
 150
 151         destroy_workqueue(bat_event_workqueue);
 152         bat_event_workqueue = NULL;
 153 }
 154
 155 /* activates the module, starts timer ... */
 156 void activate_module(void)
 157 {
 158         if (originator_init() < 1)
 159                 goto err;
 160
 161         if (hna_local_init() < 1)
 162                 goto err;
 163
 164         if (hna_global_init() < 1)
 165                 goto err;
 166
 167         hna_local_add(soft_device->dev_addr);
 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         pr_err("Unable to allocate memory for mesh information structures: "
 178                "out of mem ?\n");
 179         deactivate_module();
 180 end:
 181         return;
 182 }
 183
 184 /* shuts down the whole module.*/
 185 void deactivate_module(void)
 186 {
 187         atomic_set(&module_state, MODULE_DEACTIVATING);
 188
 189         purge_outstanding_packets(NULL);
 190         flush_workqueue(bat_event_workqueue);
 191
 192         vis_quit();
 193
 194         /* TODO: unregister BATMAN pack */
 195
 196         originator_free();
 197
 198         hna_local_free();
 199         hna_global_free();
 200
 201         synchronize_net();
 202
 203         synchronize_rcu();
 204         atomic_set(&module_state, MODULE_INACTIVE);
 205 }
 206
 207 void inc_module_count(void)
 208 {
 209         try_module_get(THIS_MODULE);
 210 }
 211
 212 void dec_module_count(void)
 213 {
 214         module_put(THIS_MODULE);
 215 }
 216
 217 int addr_to_string(char *buff, uint8_t *addr)
 218 {
 219         return sprintf(buff, "%pM", addr);
 220 }
 221
 222 /* returns 1 if they are the same originator */
 223
 224 int compare_orig(void *data1, void *data2)
 225 {
 226         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 227 }
 228
 229 /* hashfunction to choose an entry in a hash table of given size */
 230 /* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
 231 int choose_orig(void *data, int32_t size)
 232 {
 233         unsigned char *key = data;
 234         uint32_t hash = 0;
 235         size_t i;
 236
 237         for (i = 0; i < 6; i++) {
 238                 hash += key[i];
 239                 hash += (hash << 10);
 240                 hash ^= (hash >> 6);
 241         }
 242
 243         hash += (hash << 3);
 244         hash ^= (hash >> 11);
 245         hash += (hash << 15);
 246
 247         return hash % size;
 248 }
 249
 250 int is_my_mac(uint8_t *addr)
 251 {
 252         struct batman_if *batman_if;
 253
 254         rcu_read_lock();
 255         list_for_each_entry_rcu(batman_if, &if_list, list) {
 256                 if (batman_if->if_status != IF_ACTIVE)
 257                         continue;
 258
 259                 if (compare_orig(batman_if->net_dev->dev_addr, addr)) {
 260                         rcu_read_unlock();
 261                         return 1;
 262                 }
 263         }
 264         rcu_read_unlock();
 265         return 0;
 266
 267 }
 268
 269 int is_bcast(uint8_t *addr)
 270 {
 271         return (addr[0] == (uint8_t)0xff) && (addr[1] == (uint8_t)0xff);
 272 }
 273
 274 int is_mcast(uint8_t *addr)
 275 {
 276         return *addr & 0x01;
 277 }
 278
 279 module_init(batman_init);
 280 module_exit(batman_exit);
 281
 282 MODULE_LICENSE("GPL");
 283
 284 MODULE_AUTHOR(DRIVER_AUTHOR);
 285 MODULE_DESCRIPTION(DRIVER_DESC);
 286 MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
 287 #ifdef REVISION_VERSION
 288 MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION);
 289 #else
 290 MODULE_VERSION(SOURCE_VERSION);
 291 #endif