net/batman-adv/main.c

   1 /*
   2  * Copyright (C) 2007-2011 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
  36
  37 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
  38  * list traversals just rcu-locked */
  39 struct list_head hardif_list;
  40
  41 unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  42
  43 struct workqueue_struct *bat_event_workqueue;
  44
  45 static int __init batman_init(void)
  46 {
  47         INIT_LIST_HEAD(&hardif_list);
  48
  49         /* the name should not be longer than 10 chars - see
  50          * http://lwn.net/Articles/23634/ */
  51         bat_event_workqueue = create_singlethread_workqueue("bat_events");
  52
  53         if (!bat_event_workqueue)
  54                 return -ENOMEM;
  55
  56         bat_socket_init();
  57         debugfs_init();
  58
  59         register_netdevice_notifier(&hard_if_notifier);
  60
  61         pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) "
  62                 "loaded\n", SOURCE_VERSION, COMPAT_VERSION);
  63
  64         return 0;
  65 }
  66
  67 static void __exit batman_exit(void)
  68 {
  69         debugfs_destroy();
  70         unregister_netdevice_notifier(&hard_if_notifier);
  71         hardif_remove_interfaces();
  72
  73         flush_workqueue(bat_event_workqueue);
  74         destroy_workqueue(bat_event_workqueue);
  75         bat_event_workqueue = NULL;
  76
  77         rcu_barrier();
  78 }
  79
  80 int mesh_init(struct net_device *soft_iface)
  81 {
  82         struct bat_priv *bat_priv = netdev_priv(soft_iface);
  83
  84         spin_lock_init(&bat_priv->forw_bat_list_lock);
  85         spin_lock_init(&bat_priv->forw_bcast_list_lock);
  86         spin_lock_init(&bat_priv->tt_changes_list_lock);
  87         spin_lock_init(&bat_priv->tt_req_list_lock);
  88         spin_lock_init(&bat_priv->tt_roam_list_lock);
  89         spin_lock_init(&bat_priv->tt_buff_lock);
  90         spin_lock_init(&bat_priv->gw_list_lock);
  91         spin_lock_init(&bat_priv->vis_hash_lock);
  92         spin_lock_init(&bat_priv->vis_list_lock);
  93         spin_lock_init(&bat_priv->softif_neigh_lock);
  94         spin_lock_init(&bat_priv->softif_neigh_vid_lock);
  95
  96         INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
  97         INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
  98         INIT_HLIST_HEAD(&bat_priv->gw_list);
  99         INIT_HLIST_HEAD(&bat_priv->softif_neigh_vids);
 100         INIT_LIST_HEAD(&bat_priv->tt_changes_list);
 101         INIT_LIST_HEAD(&bat_priv->tt_req_list);
 102         INIT_LIST_HEAD(&bat_priv->tt_roam_list);
 103
 104         if (originator_init(bat_priv) < 1)
 105                 goto err;
 106
 107         if (tt_init(bat_priv) < 1)
 108                 goto err;
 109
 110         tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX);
 111
 112         if (vis_init(bat_priv) < 1)
 113                 goto err;
 114
 115         atomic_set(&bat_priv->gw_reselect, 0);
 116         atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
 117         goto end;
 118
 119 err:
 120         mesh_free(soft_iface);
 121         return -1;
 122
 123 end:
 124         return 0;
 125 }
 126
 127 void mesh_free(struct net_device *soft_iface)
 128 {
 129         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 130
 131         atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
 132
 133         purge_outstanding_packets(bat_priv, NULL);
 134
 135         vis_quit(bat_priv);
 136
 137         gw_node_purge(bat_priv);
 138         originator_free(bat_priv);
 139
 140         tt_free(bat_priv);
 141
 142         softif_neigh_purge(bat_priv);
 143
 144         atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
 145 }
 146
 147 void inc_module_count(void)
 148 {
 149         try_module_get(THIS_MODULE);
 150 }
 151
 152 void dec_module_count(void)
 153 {
 154         module_put(THIS_MODULE);
 155 }
 156
 157 int is_my_mac(const uint8_t *addr)
 158 {
 159         const struct hard_iface *hard_iface;
 160
 161         rcu_read_lock();
 162         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 163                 if (hard_iface->if_status != IF_ACTIVE)
 164                         continue;
 165
 166                 if (compare_eth(hard_iface->net_dev->dev_addr, addr)) {
 167                         rcu_read_unlock();
 168                         return 1;
 169                 }
 170         }
 171         rcu_read_unlock();
 172         return 0;
 173
 174 }
 175
 176 module_init(batman_init);
 177 module_exit(batman_exit);
 178
 179 MODULE_LICENSE("GPL");
 180
 181 MODULE_AUTHOR(DRIVER_AUTHOR);
 182 MODULE_DESCRIPTION(DRIVER_DESC);
 183 MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
 184 MODULE_VERSION(SOURCE_VERSION);