net/batman-adv/main.c

   1 /*
   2  * Copyright (C) 2007-2012 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 "gateway_client.h"
  33 #include "vis.h"
  34 #include "hash.h"
  35 #include "bat_algo.h"
  36
  37
  38 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
  39  * list traversals just rcu-locked */
  40 struct list_head hardif_list;
  41 char bat_routing_algo[20] = "BATMAN IV";
  42 static struct hlist_head bat_algo_list;
  43
  44 unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  45
  46 struct workqueue_struct *bat_event_workqueue;
  47
  48 static int __init batman_init(void)
  49 {
  50         INIT_LIST_HEAD(&hardif_list);
  51         INIT_HLIST_HEAD(&bat_algo_list);
  52
  53         bat_iv_init();
  54
  55         /* the name should not be longer than 10 chars - see
  56          * http://lwn.net/Articles/23634/ */
  57         bat_event_workqueue = create_singlethread_workqueue("bat_events");
  58
  59         if (!bat_event_workqueue)
  60                 return -ENOMEM;
  61
  62         bat_socket_init();
  63         debugfs_init();
  64
  65         register_netdevice_notifier(&hard_if_notifier);
  66
  67         pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
  68                 SOURCE_VERSION, COMPAT_VERSION);
  69
  70         return 0;
  71 }
  72
  73 static void __exit batman_exit(void)
  74 {
  75         debugfs_destroy();
  76         unregister_netdevice_notifier(&hard_if_notifier);
  77         hardif_remove_interfaces();
  78
  79         flush_workqueue(bat_event_workqueue);
  80         destroy_workqueue(bat_event_workqueue);
  81         bat_event_workqueue = NULL;
  82
  83         rcu_barrier();
  84 }
  85
  86 int mesh_init(struct net_device *soft_iface)
  87 {
  88         struct bat_priv *bat_priv = netdev_priv(soft_iface);
  89
  90         spin_lock_init(&bat_priv->forw_bat_list_lock);
  91         spin_lock_init(&bat_priv->forw_bcast_list_lock);
  92         spin_lock_init(&bat_priv->tt_changes_list_lock);
  93         spin_lock_init(&bat_priv->tt_req_list_lock);
  94         spin_lock_init(&bat_priv->tt_roam_list_lock);
  95         spin_lock_init(&bat_priv->tt_buff_lock);
  96         spin_lock_init(&bat_priv->gw_list_lock);
  97         spin_lock_init(&bat_priv->vis_hash_lock);
  98         spin_lock_init(&bat_priv->vis_list_lock);
  99         spin_lock_init(&bat_priv->softif_neigh_lock);
 100         spin_lock_init(&bat_priv->softif_neigh_vid_lock);
 101
 102         INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
 103         INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
 104         INIT_HLIST_HEAD(&bat_priv->gw_list);
 105         INIT_HLIST_HEAD(&bat_priv->softif_neigh_vids);
 106         INIT_LIST_HEAD(&bat_priv->tt_changes_list);
 107         INIT_LIST_HEAD(&bat_priv->tt_req_list);
 108         INIT_LIST_HEAD(&bat_priv->tt_roam_list);
 109
 110         if (originator_init(bat_priv) < 1)
 111                 goto err;
 112
 113         if (tt_init(bat_priv) < 1)
 114                 goto err;
 115
 116         tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX);
 117
 118         if (vis_init(bat_priv) < 1)
 119                 goto err;
 120
 121         atomic_set(&bat_priv->gw_reselect, 0);
 122         atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
 123         goto end;
 124
 125 err:
 126         mesh_free(soft_iface);
 127         return -1;
 128
 129 end:
 130         return 0;
 131 }
 132
 133 void mesh_free(struct net_device *soft_iface)
 134 {
 135         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 136
 137         atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
 138
 139         purge_outstanding_packets(bat_priv, NULL);
 140
 141         vis_quit(bat_priv);
 142
 143         gw_node_purge(bat_priv);
 144         originator_free(bat_priv);
 145
 146         tt_free(bat_priv);
 147
 148         softif_neigh_purge(bat_priv);
 149
 150         atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
 151 }
 152
 153 void inc_module_count(void)
 154 {
 155         try_module_get(THIS_MODULE);
 156 }
 157
 158 void dec_module_count(void)
 159 {
 160         module_put(THIS_MODULE);
 161 }
 162
 163 int is_my_mac(const uint8_t *addr)
 164 {
 165         const struct hard_iface *hard_iface;
 166
 167         rcu_read_lock();
 168         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 169                 if (hard_iface->if_status != IF_ACTIVE)
 170                         continue;
 171
 172                 if (compare_eth(hard_iface->net_dev->dev_addr, addr)) {
 173                         rcu_read_unlock();
 174                         return 1;
 175                 }
 176         }
 177         rcu_read_unlock();
 178         return 0;
 179 }
 180
 181 static struct bat_algo_ops *bat_algo_get(char *name)
 182 {
 183         struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
 184         struct hlist_node *node;
 185
 186         hlist_for_each_entry(bat_algo_ops_tmp, node, &bat_algo_list, list) {
 187                 if (strcmp(bat_algo_ops_tmp->name, name) != 0)
 188                         continue;
 189
 190                 bat_algo_ops = bat_algo_ops_tmp;
 191                 break;
 192         }
 193
 194         return bat_algo_ops;
 195 }
 196
 197 int bat_algo_register(struct bat_algo_ops *bat_algo_ops)
 198 {
 199         struct bat_algo_ops *bat_algo_ops_tmp;
 200         int ret = -1;
 201
 202         bat_algo_ops_tmp = bat_algo_get(bat_algo_ops->name);
 203         if (bat_algo_ops_tmp) {
 204                 pr_info("Trying to register already registered routing algorithm: %s\n",
 205                         bat_algo_ops->name);
 206                 goto out;
 207         }
 208
 209         /* all algorithms must implement all ops (for now) */
 210         if (!bat_algo_ops->bat_ogm_init ||
 211             !bat_algo_ops->bat_ogm_init_primary ||
 212             !bat_algo_ops->bat_ogm_update_mac ||
 213             !bat_algo_ops->bat_ogm_schedule ||
 214             !bat_algo_ops->bat_ogm_emit ||
 215             !bat_algo_ops->bat_ogm_receive) {
 216                 pr_info("Routing algo '%s' does not implement required ops\n",
 217                         bat_algo_ops->name);
 218                 goto out;
 219         }
 220
 221         INIT_HLIST_NODE(&bat_algo_ops->list);
 222         hlist_add_head(&bat_algo_ops->list, &bat_algo_list);
 223         ret = 0;
 224
 225 out:
 226         return ret;
 227 }
 228
 229 int bat_algo_select(struct bat_priv *bat_priv, char *name)
 230 {
 231         struct bat_algo_ops *bat_algo_ops;
 232         int ret = -1;
 233
 234         bat_algo_ops = bat_algo_get(name);
 235         if (!bat_algo_ops)
 236                 goto out;
 237
 238         bat_priv->bat_algo_ops = bat_algo_ops;
 239         ret = 0;
 240
 241 out:
 242         return ret;
 243 }
 244
 245 int bat_algo_seq_print_text(struct seq_file *seq, void *offset)
 246 {
 247         struct bat_algo_ops *bat_algo_ops;
 248         struct hlist_node *node;
 249
 250         seq_printf(seq, "Available routing algorithms:\n");
 251
 252         hlist_for_each_entry(bat_algo_ops, node, &bat_algo_list, list) {
 253                 seq_printf(seq, "%s\n", bat_algo_ops->name);
 254         }
 255
 256         return 0;
 257 }
 258
 259 static int param_set_ra(const char *val, const struct kernel_param *kp)
 260 {
 261         struct bat_algo_ops *bat_algo_ops;
 262
 263         bat_algo_ops = bat_algo_get((char *)val);
 264         if (!bat_algo_ops) {
 265                 pr_err("Routing algorithm '%s' is not supported\n", val);
 266                 return -EINVAL;
 267         }
 268
 269         return param_set_copystring(val, kp);
 270 }
 271
 272 static const struct kernel_param_ops param_ops_ra = {
 273         .set = param_set_ra,
 274         .get = param_get_string,
 275 };
 276
 277 static struct kparam_string __param_string_ra = {
 278         .maxlen = sizeof(bat_routing_algo),
 279         .string = bat_routing_algo,
 280 };
 281
 282 module_param_cb(routing_algo, &param_ops_ra, &__param_string_ra, 0644);
 283 module_init(batman_init);
 284 module_exit(batman_exit);
 285
 286 MODULE_LICENSE("GPL");
 287
 288 MODULE_AUTHOR(DRIVER_AUTHOR);
 289 MODULE_DESCRIPTION(DRIVER_DESC);
 290 MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
 291 MODULE_VERSION(SOURCE_VERSION);