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, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21 #include "distributed-arp-table.h"
  22 #include "hard-interface.h"
  23 #include "soft-interface.h"
  24 #include "send.h"
  25 #include "translation-table.h"
  26 #include "routing.h"
  27 #include "sysfs.h"
  28 #include "originator.h"
  29 #include "hash.h"
  30 #include "bridge_loop_avoidance.h"
  31 #include "gateway_client.h"
  32
  33 #include <linux/if_arp.h>
  34 #include <linux/if_ether.h>
  35
  36 void batadv_hardif_free_rcu(struct rcu_head *rcu)
  37 {
  38         struct batadv_hard_iface *hard_iface;
  39
  40         hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
  41         dev_put(hard_iface->net_dev);
  42         kfree(hard_iface);
  43 }
  44
  45 struct batadv_hard_iface *
  46 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
  47 {
  48         struct batadv_hard_iface *hard_iface;
  49
  50         rcu_read_lock();
  51         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
  52                 if (hard_iface->net_dev == net_dev &&
  53                     atomic_inc_not_zero(&hard_iface->refcount))
  54                         goto out;
  55         }
  56
  57         hard_iface = NULL;
  58
  59 out:
  60         rcu_read_unlock();
  61         return hard_iface;
  62 }
  63
  64 /**
  65  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
  66  * @net_dev: the device to check
  67  *
  68  * If the user creates any virtual device on top of a batman-adv interface, it
  69  * is important to prevent this new interface to be used to create a new mesh
  70  * network (this behaviour would lead to a batman-over-batman configuration).
  71  * This function recursively checks all the fathers of the device passed as
  72  * argument looking for a batman-adv soft interface.
  73  *
  74  * Returns true if the device is descendant of a batman-adv mesh interface (or
  75  * if it is a batman-adv interface itself), false otherwise
  76  */
  77 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
  78 {
  79         struct net_device *parent_dev;
  80         bool ret;
  81
  82         /* check if this is a batman-adv mesh interface */
  83         if (batadv_softif_is_valid(net_dev))
  84                 return true;
  85
  86         /* no more parents..stop recursion */
  87         if (net_dev->iflink == net_dev->ifindex)
  88                 return false;
  89
  90         /* recurse over the parent device */
  91         parent_dev = dev_get_by_index(&init_net, net_dev->iflink);
  92         /* if we got a NULL parent_dev there is something broken.. */
  93         if (WARN(!parent_dev, "Cannot find parent device"))
  94                 return false;
  95
  96         ret = batadv_is_on_batman_iface(parent_dev);
  97
  98         if (parent_dev)
  99                 dev_put(parent_dev);
 100         return ret;
 101 }
 102
 103 static int batadv_is_valid_iface(const struct net_device *net_dev)
 104 {
 105         if (net_dev->flags & IFF_LOOPBACK)
 106                 return 0;
 107
 108         if (net_dev->type != ARPHRD_ETHER)
 109                 return 0;
 110
 111         if (net_dev->addr_len != ETH_ALEN)
 112                 return 0;
 113
 114         /* no batman over batman */
 115         if (batadv_is_on_batman_iface(net_dev))
 116                 return 0;
 117
 118         return 1;
 119 }
 120
 121 /**
 122  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 123  *  interface
 124  * @net_device: the device to check
 125  *
 126  * Returns true if the net device is a 802.11 wireless device, false otherwise.
 127  */
 128 bool batadv_is_wifi_netdev(struct net_device *net_device)
 129 {
 130         if (!net_device)
 131                 return false;
 132
 133 #ifdef CONFIG_WIRELESS_EXT
 134         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 135          * check for wireless_handlers != NULL
 136          */
 137         if (net_device->wireless_handlers)
 138                 return true;
 139 #endif
 140
 141         /* cfg80211 drivers have to set ieee80211_ptr */
 142         if (net_device->ieee80211_ptr)
 143                 return true;
 144
 145         return false;
 146 }
 147
 148 static struct batadv_hard_iface *
 149 batadv_hardif_get_active(const struct net_device *soft_iface)
 150 {
 151         struct batadv_hard_iface *hard_iface;
 152
 153         rcu_read_lock();
 154         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 155                 if (hard_iface->soft_iface != soft_iface)
 156                         continue;
 157
 158                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 159                     atomic_inc_not_zero(&hard_iface->refcount))
 160                         goto out;
 161         }
 162
 163         hard_iface = NULL;
 164
 165 out:
 166         rcu_read_unlock();
 167         return hard_iface;
 168 }
 169
 170 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 171                                           struct batadv_hard_iface *oldif)
 172 {
 173         struct batadv_hard_iface *primary_if;
 174
 175         primary_if = batadv_primary_if_get_selected(bat_priv);
 176         if (!primary_if)
 177                 goto out;
 178
 179         batadv_dat_init_own_addr(bat_priv, primary_if);
 180         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 181 out:
 182         if (primary_if)
 183                 batadv_hardif_free_ref(primary_if);
 184 }
 185
 186 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 187                                      struct batadv_hard_iface *new_hard_iface)
 188 {
 189         struct batadv_hard_iface *curr_hard_iface;
 190
 191         ASSERT_RTNL();
 192
 193         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 194                 new_hard_iface = NULL;
 195
 196         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 197         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 198
 199         if (!new_hard_iface)
 200                 goto out;
 201
 202         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 203         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 204
 205 out:
 206         if (curr_hard_iface)
 207                 batadv_hardif_free_ref(curr_hard_iface);
 208 }
 209
 210 static bool
 211 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 212 {
 213         if (hard_iface->net_dev->flags & IFF_UP)
 214                 return true;
 215
 216         return false;
 217 }
 218
 219 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 220 {
 221         const struct batadv_hard_iface *hard_iface;
 222
 223         rcu_read_lock();
 224         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 225                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 226                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 227                         continue;
 228
 229                 if (hard_iface->net_dev == net_dev)
 230                         continue;
 231
 232                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 233                                         net_dev->dev_addr))
 234                         continue;
 235
 236                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 237                         net_dev->dev_addr, hard_iface->net_dev->name);
 238                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 239         }
 240         rcu_read_unlock();
 241 }
 242
 243 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 244 {
 245         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 246         const struct batadv_hard_iface *hard_iface;
 247         int min_mtu = ETH_DATA_LEN;
 248
 249         rcu_read_lock();
 250         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 251                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 252                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 253                         continue;
 254
 255                 if (hard_iface->soft_iface != soft_iface)
 256                         continue;
 257
 258                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 259         }
 260         rcu_read_unlock();
 261
 262         atomic_set(&bat_priv->packet_size_max, min_mtu);
 263
 264         if (atomic_read(&bat_priv->fragmentation) == 0)
 265                 goto out;
 266
 267         /* with fragmentation enabled the maximum size of internally generated
 268          * packets such as translation table exchanges or tvlv containers, etc
 269          * has to be calculated
 270          */
 271         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 272         min_mtu -= sizeof(struct batadv_frag_packet);
 273         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 274         atomic_set(&bat_priv->packet_size_max, min_mtu);
 275
 276         /* with fragmentation enabled we can fragment external packets easily */
 277         min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
 278
 279 out:
 280         return min_mtu - batadv_max_header_len();
 281 }
 282
 283 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 284 void batadv_update_min_mtu(struct net_device *soft_iface)
 285 {
 286         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 287
 288         /* Check if the local translate table should be cleaned up to match a
 289          * new (and smaller) MTU.
 290          */
 291         batadv_tt_local_resize_to_mtu(soft_iface);
 292 }
 293
 294 static void
 295 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 296 {
 297         struct batadv_priv *bat_priv;
 298         struct batadv_hard_iface *primary_if = NULL;
 299
 300         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 301                 goto out;
 302
 303         bat_priv = netdev_priv(hard_iface->soft_iface);
 304
 305         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 306         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 307
 308         /* the first active interface becomes our primary interface or
 309          * the next active interface after the old primary interface was removed
 310          */
 311         primary_if = batadv_primary_if_get_selected(bat_priv);
 312         if (!primary_if)
 313                 batadv_primary_if_select(bat_priv, hard_iface);
 314
 315         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 316                     hard_iface->net_dev->name);
 317
 318         batadv_update_min_mtu(hard_iface->soft_iface);
 319
 320 out:
 321         if (primary_if)
 322                 batadv_hardif_free_ref(primary_if);
 323 }
 324
 325 static void
 326 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 327 {
 328         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 329             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 330                 return;
 331
 332         hard_iface->if_status = BATADV_IF_INACTIVE;
 333
 334         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 335                     hard_iface->net_dev->name);
 336
 337         batadv_update_min_mtu(hard_iface->soft_iface);
 338 }
 339
 340 /**
 341  * batadv_master_del_slave - remove hard_iface from the current master interface
 342  * @slave: the interface enslaved in another master
 343  * @master: the master from which slave has to be removed
 344  *
 345  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 346  * is free'd and master can correctly change its internal state.
 347  * Return 0 on success, a negative value representing the error otherwise
 348  */
 349 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 350                                    struct net_device *master)
 351 {
 352         int ret;
 353
 354         if (!master)
 355                 return 0;
 356
 357         ret = -EBUSY;
 358         if (master->netdev_ops->ndo_del_slave)
 359                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 360
 361         return ret;
 362 }
 363
 364 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 365                                    const char *iface_name)
 366 {
 367         struct batadv_priv *bat_priv;
 368         struct net_device *soft_iface, *master;
 369         __be16 ethertype = htons(ETH_P_BATMAN);
 370         int max_header_len = batadv_max_header_len();
 371         int ret;
 372
 373         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 374                 goto out;
 375
 376         if (!atomic_inc_not_zero(&hard_iface->refcount))
 377                 goto out;
 378
 379         soft_iface = dev_get_by_name(&init_net, iface_name);
 380
 381         if (!soft_iface) {
 382                 soft_iface = batadv_softif_create(iface_name);
 383
 384                 if (!soft_iface) {
 385                         ret = -ENOMEM;
 386                         goto err;
 387                 }
 388
 389                 /* dev_get_by_name() increases the reference counter for us */
 390                 dev_hold(soft_iface);
 391         }
 392
 393         if (!batadv_softif_is_valid(soft_iface)) {
 394                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 395                        soft_iface->name);
 396                 ret = -EINVAL;
 397                 goto err_dev;
 398         }
 399
 400         /* check if the interface is enslaved in another virtual one and
 401          * in that case unlink it first
 402          */
 403         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 404         ret = batadv_master_del_slave(hard_iface, master);
 405         if (ret)
 406                 goto err_dev;
 407
 408         hard_iface->soft_iface = soft_iface;
 409         bat_priv = netdev_priv(hard_iface->soft_iface);
 410
 411         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 412         if (ret)
 413                 goto err_dev;
 414
 415         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 416         if (ret < 0)
 417                 goto err_upper;
 418
 419         hard_iface->if_num = bat_priv->num_ifaces;
 420         bat_priv->num_ifaces++;
 421         hard_iface->if_status = BATADV_IF_INACTIVE;
 422         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 423         if (ret < 0) {
 424                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 425                 bat_priv->num_ifaces--;
 426                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 427                 goto err_upper;
 428         }
 429
 430         hard_iface->batman_adv_ptype.type = ethertype;
 431         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 432         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 433         dev_add_pack(&hard_iface->batman_adv_ptype);
 434
 435         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 436                     hard_iface->net_dev->name);
 437
 438         if (atomic_read(&bat_priv->fragmentation) &&
 439             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 440                 batadv_info(hard_iface->soft_iface,
 441                             "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",
 442                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 443                             ETH_DATA_LEN + max_header_len);
 444
 445         if (!atomic_read(&bat_priv->fragmentation) &&
 446             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 447                 batadv_info(hard_iface->soft_iface,
 448                             "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",
 449                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 450                             ETH_DATA_LEN + max_header_len);
 451
 452         if (batadv_hardif_is_iface_up(hard_iface))
 453                 batadv_hardif_activate_interface(hard_iface);
 454         else
 455                 batadv_err(hard_iface->soft_iface,
 456                            "Not using interface %s (retrying later): interface not active\n",
 457                            hard_iface->net_dev->name);
 458
 459         /* begin scheduling originator messages on that interface */
 460         batadv_schedule_bat_ogm(hard_iface);
 461
 462 out:
 463         return 0;
 464
 465 err_upper:
 466         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 467 err_dev:
 468         hard_iface->soft_iface = NULL;
 469         dev_put(soft_iface);
 470 err:
 471         batadv_hardif_free_ref(hard_iface);
 472         return ret;
 473 }
 474
 475 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 476                                      enum batadv_hard_if_cleanup autodel)
 477 {
 478         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 479         struct batadv_hard_iface *primary_if = NULL;
 480
 481         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 482                 batadv_hardif_deactivate_interface(hard_iface);
 483
 484         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 485                 goto out;
 486
 487         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 488                     hard_iface->net_dev->name);
 489         dev_remove_pack(&hard_iface->batman_adv_ptype);
 490
 491         bat_priv->num_ifaces--;
 492         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 493
 494         primary_if = batadv_primary_if_get_selected(bat_priv);
 495         if (hard_iface == primary_if) {
 496                 struct batadv_hard_iface *new_if;
 497
 498                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 499                 batadv_primary_if_select(bat_priv, new_if);
 500
 501                 if (new_if)
 502                         batadv_hardif_free_ref(new_if);
 503         }
 504
 505         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 506         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 507
 508         /* delete all references to this hard_iface */
 509         batadv_purge_orig_ref(bat_priv);
 510         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 511         dev_put(hard_iface->soft_iface);
 512
 513         /* nobody uses this interface anymore */
 514         if (!bat_priv->num_ifaces) {
 515                 batadv_gw_check_client_stop(bat_priv);
 516
 517                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 518                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 519         }
 520
 521         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 522         hard_iface->soft_iface = NULL;
 523         batadv_hardif_free_ref(hard_iface);
 524
 525 out:
 526         if (primary_if)
 527                 batadv_hardif_free_ref(primary_if);
 528 }
 529
 530 /**
 531  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 532  * @work: work queue item
 533  *
 534  * Free the parts of the hard interface which can not be removed under
 535  * rtnl lock (to prevent deadlock situations).
 536  */
 537 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 538 {
 539         struct batadv_hard_iface *hard_iface;
 540
 541         hard_iface = container_of(work, struct batadv_hard_iface,
 542                                   cleanup_work);
 543
 544         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 545         batadv_hardif_free_ref(hard_iface);
 546 }
 547
 548 static struct batadv_hard_iface *
 549 batadv_hardif_add_interface(struct net_device *net_dev)
 550 {
 551         struct batadv_hard_iface *hard_iface;
 552         int ret;
 553
 554         ASSERT_RTNL();
 555
 556         ret = batadv_is_valid_iface(net_dev);
 557         if (ret != 1)
 558                 goto out;
 559
 560         dev_hold(net_dev);
 561
 562         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 563         if (!hard_iface)
 564                 goto release_dev;
 565
 566         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 567         if (ret)
 568                 goto free_if;
 569
 570         hard_iface->if_num = -1;
 571         hard_iface->net_dev = net_dev;
 572         hard_iface->soft_iface = NULL;
 573         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 574         INIT_LIST_HEAD(&hard_iface->list);
 575         INIT_WORK(&hard_iface->cleanup_work,
 576                   batadv_hardif_remove_interface_finish);
 577
 578         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 579         if (batadv_is_wifi_netdev(net_dev))
 580                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 581
 582         /* extra reference for return */
 583         atomic_set(&hard_iface->refcount, 2);
 584
 585         batadv_check_known_mac_addr(hard_iface->net_dev);
 586         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 587
 588         return hard_iface;
 589
 590 free_if:
 591         kfree(hard_iface);
 592 release_dev:
 593         dev_put(net_dev);
 594 out:
 595         return NULL;
 596 }
 597
 598 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 599 {
 600         ASSERT_RTNL();
 601
 602         /* first deactivate interface */
 603         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 604                 batadv_hardif_disable_interface(hard_iface,
 605                                                 BATADV_IF_CLEANUP_AUTO);
 606
 607         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 608                 return;
 609
 610         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 611         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 612 }
 613
 614 void batadv_hardif_remove_interfaces(void)
 615 {
 616         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 617
 618         rtnl_lock();
 619         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 620                                  &batadv_hardif_list, list) {
 621                 list_del_rcu(&hard_iface->list);
 622                 batadv_hardif_remove_interface(hard_iface);
 623         }
 624         rtnl_unlock();
 625 }
 626
 627 static int batadv_hard_if_event(struct notifier_block *this,
 628                                 unsigned long event, void *ptr)
 629 {
 630         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 631         struct batadv_hard_iface *hard_iface;
 632         struct batadv_hard_iface *primary_if = NULL;
 633         struct batadv_priv *bat_priv;
 634
 635         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 636                 batadv_sysfs_add_meshif(net_dev);
 637                 bat_priv = netdev_priv(net_dev);
 638                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 639                 return NOTIFY_DONE;
 640         }
 641
 642         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 643         if (!hard_iface && event == NETDEV_REGISTER)
 644                 hard_iface = batadv_hardif_add_interface(net_dev);
 645
 646         if (!hard_iface)
 647                 goto out;
 648
 649         switch (event) {
 650         case NETDEV_UP:
 651                 batadv_hardif_activate_interface(hard_iface);
 652                 break;
 653         case NETDEV_GOING_DOWN:
 654         case NETDEV_DOWN:
 655                 batadv_hardif_deactivate_interface(hard_iface);
 656                 break;
 657         case NETDEV_UNREGISTER:
 658                 list_del_rcu(&hard_iface->list);
 659
 660                 batadv_hardif_remove_interface(hard_iface);
 661                 break;
 662         case NETDEV_CHANGEMTU:
 663                 if (hard_iface->soft_iface)
 664                         batadv_update_min_mtu(hard_iface->soft_iface);
 665                 break;
 666         case NETDEV_CHANGEADDR:
 667                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 668                         goto hardif_put;
 669
 670                 batadv_check_known_mac_addr(hard_iface->net_dev);
 671
 672                 bat_priv = netdev_priv(hard_iface->soft_iface);
 673                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 674
 675                 primary_if = batadv_primary_if_get_selected(bat_priv);
 676                 if (!primary_if)
 677                         goto hardif_put;
 678
 679                 if (hard_iface == primary_if)
 680                         batadv_primary_if_update_addr(bat_priv, NULL);
 681                 break;
 682         default:
 683                 break;
 684         }
 685
 686 hardif_put:
 687         batadv_hardif_free_ref(hard_iface);
 688 out:
 689         if (primary_if)
 690                 batadv_hardif_free_ref(primary_if);
 691         return NOTIFY_DONE;
 692 }
 693
 694 struct notifier_block batadv_hard_if_notifier = {
 695         .notifier_call = batadv_hard_if_event,
 696 };