Pileus Git - ~andy/linux/blob - net/batman-adv/hard-interface.c

   1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19 #include "distributed-arp-table.h"
  20 #include "hard-interface.h"
  21 #include "soft-interface.h"
  22 #include "send.h"
  23 #include "translation-table.h"
  24 #include "routing.h"
  25 #include "sysfs.h"
  26 #include "originator.h"
  27 #include "hash.h"
  28 #include "bridge_loop_avoidance.h"
  29 #include "gateway_client.h"
  30
  31 #include <linux/if_arp.h>
  32 #include <linux/if_ether.h>
  33
  34 void batadv_hardif_free_rcu(struct rcu_head *rcu)
  35 {
  36         struct batadv_hard_iface *hard_iface;
  37
  38         hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
  39         dev_put(hard_iface->net_dev);
  40         kfree(hard_iface);
  41 }
  42
  43 struct batadv_hard_iface *
  44 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
  45 {
  46         struct batadv_hard_iface *hard_iface;
  47
  48         rcu_read_lock();
  49         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
  50                 if (hard_iface->net_dev == net_dev &&
  51                     atomic_inc_not_zero(&hard_iface->refcount))
  52                         goto out;
  53         }
  54
  55         hard_iface = NULL;
  56
  57 out:
  58         rcu_read_unlock();
  59         return hard_iface;
  60 }
  61
  62 /**
  63  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
  64  * @net_dev: the device to check
  65  *
  66  * If the user creates any virtual device on top of a batman-adv interface, it
  67  * is important to prevent this new interface to be used to create a new mesh
  68  * network (this behaviour would lead to a batman-over-batman configuration).
  69  * This function recursively checks all the fathers of the device passed as
  70  * argument looking for a batman-adv soft interface.
  71  *
  72  * Returns true if the device is descendant of a batman-adv mesh interface (or
  73  * if it is a batman-adv interface itself), false otherwise
  74  */
  75 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
  76 {
  77         struct net_device *parent_dev;
  78         bool ret;
  79
  80         /* check if this is a batman-adv mesh interface */
  81         if (batadv_softif_is_valid(net_dev))
  82                 return true;
  83
  84         /* no more parents..stop recursion */
  85         if (net_dev->iflink == net_dev->ifindex)
  86                 return false;
  87
  88         /* recurse over the parent device */
  89         parent_dev = dev_get_by_index(&init_net, net_dev->iflink);
  90         /* if we got a NULL parent_dev there is something broken.. */
  91         if (WARN(!parent_dev, "Cannot find parent device"))
  92                 return false;
  93
  94         ret = batadv_is_on_batman_iface(parent_dev);
  95
  96         if (parent_dev)
  97                 dev_put(parent_dev);
  98         return ret;
  99 }
 100
 101 static int batadv_is_valid_iface(const struct net_device *net_dev)
 102 {
 103         if (net_dev->flags & IFF_LOOPBACK)
 104                 return 0;
 105
 106         if (net_dev->type != ARPHRD_ETHER)
 107                 return 0;
 108
 109         if (net_dev->addr_len != ETH_ALEN)
 110                 return 0;
 111
 112         /* no batman over batman */
 113         if (batadv_is_on_batman_iface(net_dev))
 114                 return 0;
 115
 116         return 1;
 117 }
 118
 119 /**
 120  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 121  *  interface
 122  * @net_device: the device to check
 123  *
 124  * Returns true if the net device is a 802.11 wireless device, false otherwise.
 125  */
 126 bool batadv_is_wifi_netdev(struct net_device *net_device)
 127 {
 128         if (!net_device)
 129                 return false;
 130
 131 #ifdef CONFIG_WIRELESS_EXT
 132         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 133          * check for wireless_handlers != NULL
 134          */
 135         if (net_device->wireless_handlers)
 136                 return true;
 137 #endif
 138
 139         /* cfg80211 drivers have to set ieee80211_ptr */
 140         if (net_device->ieee80211_ptr)
 141                 return true;
 142
 143         return false;
 144 }
 145
 146 static struct batadv_hard_iface *
 147 batadv_hardif_get_active(const struct net_device *soft_iface)
 148 {
 149         struct batadv_hard_iface *hard_iface;
 150
 151         rcu_read_lock();
 152         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 153                 if (hard_iface->soft_iface != soft_iface)
 154                         continue;
 155
 156                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 157                     atomic_inc_not_zero(&hard_iface->refcount))
 158                         goto out;
 159         }
 160
 161         hard_iface = NULL;
 162
 163 out:
 164         rcu_read_unlock();
 165         return hard_iface;
 166 }
 167
 168 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 169                                           struct batadv_hard_iface *oldif)
 170 {
 171         struct batadv_hard_iface *primary_if;
 172
 173         primary_if = batadv_primary_if_get_selected(bat_priv);
 174         if (!primary_if)
 175                 goto out;
 176
 177         batadv_dat_init_own_addr(bat_priv, primary_if);
 178         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 179 out:
 180         if (primary_if)
 181                 batadv_hardif_free_ref(primary_if);
 182 }
 183
 184 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 185                                      struct batadv_hard_iface *new_hard_iface)
 186 {
 187         struct batadv_hard_iface *curr_hard_iface;
 188
 189         ASSERT_RTNL();
 190
 191         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 192                 new_hard_iface = NULL;
 193
 194         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 195         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 196
 197         if (!new_hard_iface)
 198                 goto out;
 199
 200         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 201         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 202
 203 out:
 204         if (curr_hard_iface)
 205                 batadv_hardif_free_ref(curr_hard_iface);
 206 }
 207
 208 static bool
 209 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 210 {
 211         if (hard_iface->net_dev->flags & IFF_UP)
 212                 return true;
 213
 214         return false;
 215 }
 216
 217 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 218 {
 219         const struct batadv_hard_iface *hard_iface;
 220
 221         rcu_read_lock();
 222         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 223                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 224                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 225                         continue;
 226
 227                 if (hard_iface->net_dev == net_dev)
 228                         continue;
 229
 230                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 231                                         net_dev->dev_addr))
 232                         continue;
 233
 234                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 235                         net_dev->dev_addr, hard_iface->net_dev->name);
 236                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 237         }
 238         rcu_read_unlock();
 239 }
 240
 241 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 242 {
 243         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 244         const struct batadv_hard_iface *hard_iface;
 245         int min_mtu = ETH_DATA_LEN;
 246
 247         rcu_read_lock();
 248         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 249                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 250                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 251                         continue;
 252
 253                 if (hard_iface->soft_iface != soft_iface)
 254                         continue;
 255
 256                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 257         }
 258         rcu_read_unlock();
 259
 260         atomic_set(&bat_priv->packet_size_max, min_mtu);
 261
 262         if (atomic_read(&bat_priv->fragmentation) == 0)
 263                 goto out;
 264
 265         /* with fragmentation enabled the maximum size of internally generated
 266          * packets such as translation table exchanges or tvlv containers, etc
 267          * has to be calculated
 268          */
 269         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 270         min_mtu -= sizeof(struct batadv_frag_packet);
 271         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 272         atomic_set(&bat_priv->packet_size_max, min_mtu);
 273
 274         /* with fragmentation enabled we can fragment external packets easily */
 275         min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
 276
 277 out:
 278         return min_mtu - batadv_max_header_len();
 279 }
 280
 281 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 282 void batadv_update_min_mtu(struct net_device *soft_iface)
 283 {
 284         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 285
 286         /* Check if the local translate table should be cleaned up to match a
 287          * new (and smaller) MTU.
 288          */
 289         batadv_tt_local_resize_to_mtu(soft_iface);
 290 }
 291
 292 static void
 293 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 294 {
 295         struct batadv_priv *bat_priv;
 296         struct batadv_hard_iface *primary_if = NULL;
 297
 298         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 299                 goto out;
 300
 301         bat_priv = netdev_priv(hard_iface->soft_iface);
 302
 303         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 304         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 305
 306         /* the first active interface becomes our primary interface or
 307          * the next active interface after the old primary interface was removed
 308          */
 309         primary_if = batadv_primary_if_get_selected(bat_priv);
 310         if (!primary_if)
 311                 batadv_primary_if_select(bat_priv, hard_iface);
 312
 313         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 314                     hard_iface->net_dev->name);
 315
 316         batadv_update_min_mtu(hard_iface->soft_iface);
 317
 318 out:
 319         if (primary_if)
 320                 batadv_hardif_free_ref(primary_if);
 321 }
 322
 323 static void
 324 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 325 {
 326         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 327             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 328                 return;
 329
 330         hard_iface->if_status = BATADV_IF_INACTIVE;
 331
 332         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 333                     hard_iface->net_dev->name);
 334
 335         batadv_update_min_mtu(hard_iface->soft_iface);
 336 }
 337
 338 /**
 339  * batadv_master_del_slave - remove hard_iface from the current master interface
 340  * @slave: the interface enslaved in another master
 341  * @master: the master from which slave has to be removed
 342  *
 343  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 344  * is free'd and master can correctly change its internal state.
 345  * Return 0 on success, a negative value representing the error otherwise
 346  */
 347 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 348                                    struct net_device *master)
 349 {
 350         int ret;
 351
 352         if (!master)
 353                 return 0;
 354
 355         ret = -EBUSY;
 356         if (master->netdev_ops->ndo_del_slave)
 357                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 358
 359         return ret;
 360 }
 361
 362 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 363                                    const char *iface_name)
 364 {
 365         struct batadv_priv *bat_priv;
 366         struct net_device *soft_iface, *master;
 367         __be16 ethertype = htons(ETH_P_BATMAN);
 368         int max_header_len = batadv_max_header_len();
 369         int ret;
 370
 371         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 372                 goto out;
 373
 374         if (!atomic_inc_not_zero(&hard_iface->refcount))
 375                 goto out;
 376
 377         soft_iface = dev_get_by_name(&init_net, iface_name);
 378
 379         if (!soft_iface) {
 380                 soft_iface = batadv_softif_create(iface_name);
 381
 382                 if (!soft_iface) {
 383                         ret = -ENOMEM;
 384                         goto err;
 385                 }
 386
 387                 /* dev_get_by_name() increases the reference counter for us */
 388                 dev_hold(soft_iface);
 389         }
 390
 391         if (!batadv_softif_is_valid(soft_iface)) {
 392                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 393                        soft_iface->name);
 394                 ret = -EINVAL;
 395                 goto err_dev;
 396         }
 397
 398         /* check if the interface is enslaved in another virtual one and
 399          * in that case unlink it first
 400          */
 401         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 402         ret = batadv_master_del_slave(hard_iface, master);
 403         if (ret)
 404                 goto err_dev;
 405
 406         hard_iface->soft_iface = soft_iface;
 407         bat_priv = netdev_priv(hard_iface->soft_iface);
 408
 409         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 410         if (ret)
 411                 goto err_dev;
 412
 413         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 414         if (ret < 0)
 415                 goto err_upper;
 416
 417         hard_iface->if_num = bat_priv->num_ifaces;
 418         bat_priv->num_ifaces++;
 419         hard_iface->if_status = BATADV_IF_INACTIVE;
 420         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 421         if (ret < 0) {
 422                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 423                 bat_priv->num_ifaces--;
 424                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 425                 goto err_upper;
 426         }
 427
 428         hard_iface->batman_adv_ptype.type = ethertype;
 429         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 430         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 431         dev_add_pack(&hard_iface->batman_adv_ptype);
 432
 433         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 434                     hard_iface->net_dev->name);
 435
 436         if (atomic_read(&bat_priv->fragmentation) &&
 437             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 438                 batadv_info(hard_iface->soft_iface,
 439                             "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
 440                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 441                             ETH_DATA_LEN + max_header_len);
 442
 443         if (!atomic_read(&bat_priv->fragmentation) &&
 444             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 445                 batadv_info(hard_iface->soft_iface,
 446                             "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
 447                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 448                             ETH_DATA_LEN + max_header_len);
 449
 450         if (batadv_hardif_is_iface_up(hard_iface))
 451                 batadv_hardif_activate_interface(hard_iface);
 452         else
 453                 batadv_err(hard_iface->soft_iface,
 454                            "Not using interface %s (retrying later): interface not active\n",
 455                            hard_iface->net_dev->name);
 456
 457         /* begin scheduling originator messages on that interface */
 458         batadv_schedule_bat_ogm(hard_iface);
 459
 460 out:
 461         return 0;
 462
 463 err_upper:
 464         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 465 err_dev:
 466         hard_iface->soft_iface = NULL;
 467         dev_put(soft_iface);
 468 err:
 469         batadv_hardif_free_ref(hard_iface);
 470         return ret;
 471 }
 472
 473 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 474                                      enum batadv_hard_if_cleanup autodel)
 475 {
 476         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 477         struct batadv_hard_iface *primary_if = NULL;
 478
 479         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 480                 batadv_hardif_deactivate_interface(hard_iface);
 481
 482         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 483                 goto out;
 484
 485         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 486                     hard_iface->net_dev->name);
 487         dev_remove_pack(&hard_iface->batman_adv_ptype);
 488
 489         bat_priv->num_ifaces--;
 490         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 491
 492         primary_if = batadv_primary_if_get_selected(bat_priv);
 493         if (hard_iface == primary_if) {
 494                 struct batadv_hard_iface *new_if;
 495
 496                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 497                 batadv_primary_if_select(bat_priv, new_if);
 498
 499                 if (new_if)
 500                         batadv_hardif_free_ref(new_if);
 501         }
 502
 503         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 504         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 505
 506         /* delete all references to this hard_iface */
 507         batadv_purge_orig_ref(bat_priv);
 508         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 509         dev_put(hard_iface->soft_iface);
 510
 511         /* nobody uses this interface anymore */
 512         if (!bat_priv->num_ifaces) {
 513                 batadv_gw_check_client_stop(bat_priv);
 514
 515                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 516                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 517         }
 518
 519         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 520         hard_iface->soft_iface = NULL;
 521         batadv_hardif_free_ref(hard_iface);
 522
 523 out:
 524         if (primary_if)
 525                 batadv_hardif_free_ref(primary_if);
 526 }
 527
 528 /**
 529  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 530  * @work: work queue item
 531  *
 532  * Free the parts of the hard interface which can not be removed under
 533  * rtnl lock (to prevent deadlock situations).
 534  */
 535 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 536 {
 537         struct batadv_hard_iface *hard_iface;
 538
 539         hard_iface = container_of(work, struct batadv_hard_iface,
 540                                   cleanup_work);
 541
 542         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 543         batadv_hardif_free_ref(hard_iface);
 544 }
 545
 546 static struct batadv_hard_iface *
 547 batadv_hardif_add_interface(struct net_device *net_dev)
 548 {
 549         struct batadv_hard_iface *hard_iface;
 550         int ret;
 551
 552         ASSERT_RTNL();
 553
 554         ret = batadv_is_valid_iface(net_dev);
 555         if (ret != 1)
 556                 goto out;
 557
 558         dev_hold(net_dev);
 559
 560         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 561         if (!hard_iface)
 562                 goto release_dev;
 563
 564         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 565         if (ret)
 566                 goto free_if;
 567
 568         hard_iface->if_num = -1;
 569         hard_iface->net_dev = net_dev;
 570         hard_iface->soft_iface = NULL;
 571         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 572         INIT_LIST_HEAD(&hard_iface->list);
 573         INIT_WORK(&hard_iface->cleanup_work,
 574                   batadv_hardif_remove_interface_finish);
 575
 576         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 577         if (batadv_is_wifi_netdev(net_dev))
 578                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 579
 580         /* extra reference for return */
 581         atomic_set(&hard_iface->refcount, 2);
 582
 583         batadv_check_known_mac_addr(hard_iface->net_dev);
 584         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 585
 586         return hard_iface;
 587
 588 free_if:
 589         kfree(hard_iface);
 590 release_dev:
 591         dev_put(net_dev);
 592 out:
 593         return NULL;
 594 }
 595
 596 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 597 {
 598         ASSERT_RTNL();
 599
 600         /* first deactivate interface */
 601         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 602                 batadv_hardif_disable_interface(hard_iface,
 603                                                 BATADV_IF_CLEANUP_AUTO);
 604
 605         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 606                 return;
 607
 608         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 609         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 610 }
 611
 612 void batadv_hardif_remove_interfaces(void)
 613 {
 614         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 615
 616         rtnl_lock();
 617         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 618                                  &batadv_hardif_list, list) {
 619                 list_del_rcu(&hard_iface->list);
 620                 batadv_hardif_remove_interface(hard_iface);
 621         }
 622         rtnl_unlock();
 623 }
 624
 625 static int batadv_hard_if_event(struct notifier_block *this,
 626                                 unsigned long event, void *ptr)
 627 {
 628         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 629         struct batadv_hard_iface *hard_iface;
 630         struct batadv_hard_iface *primary_if = NULL;
 631         struct batadv_priv *bat_priv;
 632
 633         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 634                 batadv_sysfs_add_meshif(net_dev);
 635                 bat_priv = netdev_priv(net_dev);
 636                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 637                 return NOTIFY_DONE;
 638         }
 639
 640         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 641         if (!hard_iface && event == NETDEV_REGISTER)
 642                 hard_iface = batadv_hardif_add_interface(net_dev);
 643
 644         if (!hard_iface)
 645                 goto out;
 646
 647         switch (event) {
 648         case NETDEV_UP:
 649                 batadv_hardif_activate_interface(hard_iface);
 650                 break;
 651         case NETDEV_GOING_DOWN:
 652         case NETDEV_DOWN:
 653                 batadv_hardif_deactivate_interface(hard_iface);
 654                 break;
 655         case NETDEV_UNREGISTER:
 656                 list_del_rcu(&hard_iface->list);
 657
 658                 batadv_hardif_remove_interface(hard_iface);
 659                 break;
 660         case NETDEV_CHANGEMTU:
 661                 if (hard_iface->soft_iface)
 662                         batadv_update_min_mtu(hard_iface->soft_iface);
 663                 break;
 664         case NETDEV_CHANGEADDR:
 665                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 666                         goto hardif_put;
 667
 668                 batadv_check_known_mac_addr(hard_iface->net_dev);
 669
 670                 bat_priv = netdev_priv(hard_iface->soft_iface);
 671                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 672
 673                 primary_if = batadv_primary_if_get_selected(bat_priv);
 674                 if (!primary_if)
 675                         goto hardif_put;
 676
 677                 if (hard_iface == primary_if)
 678                         batadv_primary_if_update_addr(bat_priv, NULL);
 679                 break;
 680         default:
 681                 break;
 682         }
 683
 684 hardif_put:
 685         batadv_hardif_free_ref(hard_iface);
 686 out:
 687         if (primary_if)
 688                 batadv_hardif_free_ref(primary_if);
 689         return NOTIFY_DONE;
 690 }
 691
 692 struct notifier_block batadv_hard_if_notifier = {
 693         .notifier_call = batadv_hard_if_event,
 694 };