net/batman-adv/hard-interface.c

   1 /* Copyright (C) 2007-2014 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 "debugfs.h"
  27 #include "originator.h"
  28 #include "hash.h"
  29 #include "bridge_loop_avoidance.h"
  30 #include "gateway_client.h"
  31
  32 #include <linux/if_arp.h>
  33 #include <linux/if_ether.h>
  34
  35 void batadv_hardif_free_rcu(struct rcu_head *rcu)
  36 {
  37         struct batadv_hard_iface *hard_iface;
  38
  39         hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
  40         dev_put(hard_iface->net_dev);
  41         kfree(hard_iface);
  42 }
  43
  44 struct batadv_hard_iface *
  45 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
  46 {
  47         struct batadv_hard_iface *hard_iface;
  48
  49         rcu_read_lock();
  50         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
  51                 if (hard_iface->net_dev == net_dev &&
  52                     atomic_inc_not_zero(&hard_iface->refcount))
  53                         goto out;
  54         }
  55
  56         hard_iface = NULL;
  57
  58 out:
  59         rcu_read_unlock();
  60         return hard_iface;
  61 }
  62
  63 /**
  64  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
  65  * @net_dev: the device to check
  66  *
  67  * If the user creates any virtual device on top of a batman-adv interface, it
  68  * is important to prevent this new interface to be used to create a new mesh
  69  * network (this behaviour would lead to a batman-over-batman configuration).
  70  * This function recursively checks all the fathers of the device passed as
  71  * argument looking for a batman-adv soft interface.
  72  *
  73  * Returns true if the device is descendant of a batman-adv mesh interface (or
  74  * if it is a batman-adv interface itself), false otherwise
  75  */
  76 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
  77 {
  78         struct net_device *parent_dev;
  79         bool ret;
  80
  81         /* check if this is a batman-adv mesh interface */
  82         if (batadv_softif_is_valid(net_dev))
  83                 return true;
  84
  85         /* no more parents..stop recursion */
  86         if (net_dev->iflink == net_dev->ifindex)
  87                 return false;
  88
  89         /* recurse over the parent device */
  90         parent_dev = __dev_get_by_index(&init_net, net_dev->iflink);
  91         /* if we got a NULL parent_dev there is something broken.. */
  92         if (WARN(!parent_dev, "Cannot find parent device"))
  93                 return false;
  94
  95         ret = batadv_is_on_batman_iface(parent_dev);
  96
  97         return ret;
  98 }
  99
 100 static int batadv_is_valid_iface(const struct net_device *net_dev)
 101 {
 102         if (net_dev->flags & IFF_LOOPBACK)
 103                 return 0;
 104
 105         if (net_dev->type != ARPHRD_ETHER)
 106                 return 0;
 107
 108         if (net_dev->addr_len != ETH_ALEN)
 109                 return 0;
 110
 111         /* no batman over batman */
 112         if (batadv_is_on_batman_iface(net_dev))
 113                 return 0;
 114
 115         return 1;
 116 }
 117
 118 /**
 119  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 120  *  interface
 121  * @net_device: the device to check
 122  *
 123  * Returns true if the net device is a 802.11 wireless device, false otherwise.
 124  */
 125 bool batadv_is_wifi_netdev(struct net_device *net_device)
 126 {
 127         if (!net_device)
 128                 return false;
 129
 130 #ifdef CONFIG_WIRELESS_EXT
 131         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 132          * check for wireless_handlers != NULL
 133          */
 134         if (net_device->wireless_handlers)
 135                 return true;
 136 #endif
 137
 138         /* cfg80211 drivers have to set ieee80211_ptr */
 139         if (net_device->ieee80211_ptr)
 140                 return true;
 141
 142         return false;
 143 }
 144
 145 static struct batadv_hard_iface *
 146 batadv_hardif_get_active(const struct net_device *soft_iface)
 147 {
 148         struct batadv_hard_iface *hard_iface;
 149
 150         rcu_read_lock();
 151         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 152                 if (hard_iface->soft_iface != soft_iface)
 153                         continue;
 154
 155                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 156                     atomic_inc_not_zero(&hard_iface->refcount))
 157                         goto out;
 158         }
 159
 160         hard_iface = NULL;
 161
 162 out:
 163         rcu_read_unlock();
 164         return hard_iface;
 165 }
 166
 167 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 168                                           struct batadv_hard_iface *oldif)
 169 {
 170         struct batadv_hard_iface *primary_if;
 171
 172         primary_if = batadv_primary_if_get_selected(bat_priv);
 173         if (!primary_if)
 174                 goto out;
 175
 176         batadv_dat_init_own_addr(bat_priv, primary_if);
 177         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 178 out:
 179         if (primary_if)
 180                 batadv_hardif_free_ref(primary_if);
 181 }
 182
 183 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 184                                      struct batadv_hard_iface *new_hard_iface)
 185 {
 186         struct batadv_hard_iface *curr_hard_iface;
 187
 188         ASSERT_RTNL();
 189
 190         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 191                 new_hard_iface = NULL;
 192
 193         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 194         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 195
 196         if (!new_hard_iface)
 197                 goto out;
 198
 199         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 200         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 201
 202 out:
 203         if (curr_hard_iface)
 204                 batadv_hardif_free_ref(curr_hard_iface);
 205 }
 206
 207 static bool
 208 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 209 {
 210         if (hard_iface->net_dev->flags & IFF_UP)
 211                 return true;
 212
 213         return false;
 214 }
 215
 216 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 217 {
 218         const struct batadv_hard_iface *hard_iface;
 219
 220         rcu_read_lock();
 221         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 222                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 223                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 224                         continue;
 225
 226                 if (hard_iface->net_dev == net_dev)
 227                         continue;
 228
 229                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 230                                         net_dev->dev_addr))
 231                         continue;
 232
 233                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 234                         net_dev->dev_addr, hard_iface->net_dev->name);
 235                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 236         }
 237         rcu_read_unlock();
 238 }
 239
 240 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 241 {
 242         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 243         const struct batadv_hard_iface *hard_iface;
 244         int min_mtu = INT_MAX;
 245
 246         rcu_read_lock();
 247         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 248                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 249                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 250                         continue;
 251
 252                 if (hard_iface->soft_iface != soft_iface)
 253                         continue;
 254
 255                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 256         }
 257         rcu_read_unlock();
 258
 259         if (atomic_read(&bat_priv->fragmentation) == 0)
 260                 goto out;
 261
 262         /* with fragmentation enabled the maximum size of internally generated
 263          * packets such as translation table exchanges or tvlv containers, etc
 264          * has to be calculated
 265          */
 266         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 267         min_mtu -= sizeof(struct batadv_frag_packet);
 268         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 269
 270 out:
 271         /* report to the other components the maximum amount of bytes that
 272          * batman-adv can send over the wire (without considering the payload
 273          * overhead). For example, this value is used by TT to compute the
 274          * maximum local table table size
 275          */
 276         atomic_set(&bat_priv->packet_size_max, min_mtu);
 277
 278         /* the real soft-interface MTU is computed by removing the payload
 279          * overhead from the maximum amount of bytes that was just computed.
 280          *
 281          * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
 282          */
 283         return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
 284 }
 285
 286 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 287 void batadv_update_min_mtu(struct net_device *soft_iface)
 288 {
 289         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 290
 291         /* Check if the local translate table should be cleaned up to match a
 292          * new (and smaller) MTU.
 293          */
 294         batadv_tt_local_resize_to_mtu(soft_iface);
 295 }
 296
 297 static void
 298 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 299 {
 300         struct batadv_priv *bat_priv;
 301         struct batadv_hard_iface *primary_if = NULL;
 302
 303         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 304                 goto out;
 305
 306         bat_priv = netdev_priv(hard_iface->soft_iface);
 307
 308         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 309         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 310
 311         /* the first active interface becomes our primary interface or
 312          * the next active interface after the old primary interface was removed
 313          */
 314         primary_if = batadv_primary_if_get_selected(bat_priv);
 315         if (!primary_if)
 316                 batadv_primary_if_select(bat_priv, hard_iface);
 317
 318         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 319                     hard_iface->net_dev->name);
 320
 321         batadv_update_min_mtu(hard_iface->soft_iface);
 322
 323 out:
 324         if (primary_if)
 325                 batadv_hardif_free_ref(primary_if);
 326 }
 327
 328 static void
 329 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 330 {
 331         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 332             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 333                 return;
 334
 335         hard_iface->if_status = BATADV_IF_INACTIVE;
 336
 337         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 338                     hard_iface->net_dev->name);
 339
 340         batadv_update_min_mtu(hard_iface->soft_iface);
 341 }
 342
 343 /**
 344  * batadv_master_del_slave - remove hard_iface from the current master interface
 345  * @slave: the interface enslaved in another master
 346  * @master: the master from which slave has to be removed
 347  *
 348  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 349  * is free'd and master can correctly change its internal state.
 350  * Return 0 on success, a negative value representing the error otherwise
 351  */
 352 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 353                                    struct net_device *master)
 354 {
 355         int ret;
 356
 357         if (!master)
 358                 return 0;
 359
 360         ret = -EBUSY;
 361         if (master->netdev_ops->ndo_del_slave)
 362                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 363
 364         return ret;
 365 }
 366
 367 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 368                                    const char *iface_name)
 369 {
 370         struct batadv_priv *bat_priv;
 371         struct net_device *soft_iface, *master;
 372         __be16 ethertype = htons(ETH_P_BATMAN);
 373         int max_header_len = batadv_max_header_len();
 374         int ret;
 375
 376         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 377                 goto out;
 378
 379         if (!atomic_inc_not_zero(&hard_iface->refcount))
 380                 goto out;
 381
 382         soft_iface = dev_get_by_name(&init_net, iface_name);
 383
 384         if (!soft_iface) {
 385                 soft_iface = batadv_softif_create(iface_name);
 386
 387                 if (!soft_iface) {
 388                         ret = -ENOMEM;
 389                         goto err;
 390                 }
 391
 392                 /* dev_get_by_name() increases the reference counter for us */
 393                 dev_hold(soft_iface);
 394         }
 395
 396         if (!batadv_softif_is_valid(soft_iface)) {
 397                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 398                        soft_iface->name);
 399                 ret = -EINVAL;
 400                 goto err_dev;
 401         }
 402
 403         /* check if the interface is enslaved in another virtual one and
 404          * in that case unlink it first
 405          */
 406         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 407         ret = batadv_master_del_slave(hard_iface, master);
 408         if (ret)
 409                 goto err_dev;
 410
 411         hard_iface->soft_iface = soft_iface;
 412         bat_priv = netdev_priv(hard_iface->soft_iface);
 413
 414         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 415         if (ret)
 416                 goto err_dev;
 417
 418         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 419         if (ret < 0)
 420                 goto err_upper;
 421
 422         hard_iface->if_num = bat_priv->num_ifaces;
 423         bat_priv->num_ifaces++;
 424         hard_iface->if_status = BATADV_IF_INACTIVE;
 425         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 426         if (ret < 0) {
 427                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 428                 bat_priv->num_ifaces--;
 429                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 430                 goto err_upper;
 431         }
 432
 433         hard_iface->batman_adv_ptype.type = ethertype;
 434         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 435         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 436         dev_add_pack(&hard_iface->batman_adv_ptype);
 437
 438         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 439                     hard_iface->net_dev->name);
 440
 441         if (atomic_read(&bat_priv->fragmentation) &&
 442             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 443                 batadv_info(hard_iface->soft_iface,
 444                             "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",
 445                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 446                             ETH_DATA_LEN + max_header_len);
 447
 448         if (!atomic_read(&bat_priv->fragmentation) &&
 449             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 450                 batadv_info(hard_iface->soft_iface,
 451                             "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",
 452                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 453                             ETH_DATA_LEN + max_header_len);
 454
 455         if (batadv_hardif_is_iface_up(hard_iface))
 456                 batadv_hardif_activate_interface(hard_iface);
 457         else
 458                 batadv_err(hard_iface->soft_iface,
 459                            "Not using interface %s (retrying later): interface not active\n",
 460                            hard_iface->net_dev->name);
 461
 462         /* begin scheduling originator messages on that interface */
 463         batadv_schedule_bat_ogm(hard_iface);
 464
 465 out:
 466         return 0;
 467
 468 err_upper:
 469         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 470 err_dev:
 471         hard_iface->soft_iface = NULL;
 472         dev_put(soft_iface);
 473 err:
 474         batadv_hardif_free_ref(hard_iface);
 475         return ret;
 476 }
 477
 478 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 479                                      enum batadv_hard_if_cleanup autodel)
 480 {
 481         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 482         struct batadv_hard_iface *primary_if = NULL;
 483
 484         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 485                 batadv_hardif_deactivate_interface(hard_iface);
 486
 487         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 488                 goto out;
 489
 490         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 491                     hard_iface->net_dev->name);
 492         dev_remove_pack(&hard_iface->batman_adv_ptype);
 493
 494         bat_priv->num_ifaces--;
 495         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 496
 497         primary_if = batadv_primary_if_get_selected(bat_priv);
 498         if (hard_iface == primary_if) {
 499                 struct batadv_hard_iface *new_if;
 500
 501                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 502                 batadv_primary_if_select(bat_priv, new_if);
 503
 504                 if (new_if)
 505                         batadv_hardif_free_ref(new_if);
 506         }
 507
 508         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 509         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 510
 511         /* delete all references to this hard_iface */
 512         batadv_purge_orig_ref(bat_priv);
 513         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 514         dev_put(hard_iface->soft_iface);
 515
 516         /* nobody uses this interface anymore */
 517         if (!bat_priv->num_ifaces) {
 518                 batadv_gw_check_client_stop(bat_priv);
 519
 520                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 521                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 522         }
 523
 524         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 525         hard_iface->soft_iface = NULL;
 526         batadv_hardif_free_ref(hard_iface);
 527
 528 out:
 529         if (primary_if)
 530                 batadv_hardif_free_ref(primary_if);
 531 }
 532
 533 /**
 534  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 535  * @work: work queue item
 536  *
 537  * Free the parts of the hard interface which can not be removed under
 538  * rtnl lock (to prevent deadlock situations).
 539  */
 540 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 541 {
 542         struct batadv_hard_iface *hard_iface;
 543
 544         hard_iface = container_of(work, struct batadv_hard_iface,
 545                                   cleanup_work);
 546
 547         batadv_debugfs_del_hardif(hard_iface);
 548         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 549         batadv_hardif_free_ref(hard_iface);
 550 }
 551
 552 static struct batadv_hard_iface *
 553 batadv_hardif_add_interface(struct net_device *net_dev)
 554 {
 555         struct batadv_hard_iface *hard_iface;
 556         int ret;
 557
 558         ASSERT_RTNL();
 559
 560         ret = batadv_is_valid_iface(net_dev);
 561         if (ret != 1)
 562                 goto out;
 563
 564         dev_hold(net_dev);
 565
 566         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 567         if (!hard_iface)
 568                 goto release_dev;
 569
 570         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 571         if (ret)
 572                 goto free_if;
 573
 574         hard_iface->if_num = -1;
 575         hard_iface->net_dev = net_dev;
 576         hard_iface->soft_iface = NULL;
 577         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 578
 579         ret = batadv_debugfs_add_hardif(hard_iface);
 580         if (ret)
 581                 goto free_sysfs;
 582
 583         INIT_LIST_HEAD(&hard_iface->list);
 584         INIT_WORK(&hard_iface->cleanup_work,
 585                   batadv_hardif_remove_interface_finish);
 586
 587         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 588         if (batadv_is_wifi_netdev(net_dev))
 589                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 590
 591         /* extra reference for return */
 592         atomic_set(&hard_iface->refcount, 2);
 593
 594         batadv_check_known_mac_addr(hard_iface->net_dev);
 595         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 596
 597         return hard_iface;
 598
 599 free_sysfs:
 600         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 601 free_if:
 602         kfree(hard_iface);
 603 release_dev:
 604         dev_put(net_dev);
 605 out:
 606         return NULL;
 607 }
 608
 609 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 610 {
 611         ASSERT_RTNL();
 612
 613         /* first deactivate interface */
 614         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 615                 batadv_hardif_disable_interface(hard_iface,
 616                                                 BATADV_IF_CLEANUP_AUTO);
 617
 618         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 619                 return;
 620
 621         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 622         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 623 }
 624
 625 void batadv_hardif_remove_interfaces(void)
 626 {
 627         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 628
 629         rtnl_lock();
 630         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 631                                  &batadv_hardif_list, list) {
 632                 list_del_rcu(&hard_iface->list);
 633                 batadv_hardif_remove_interface(hard_iface);
 634         }
 635         rtnl_unlock();
 636 }
 637
 638 static int batadv_hard_if_event(struct notifier_block *this,
 639                                 unsigned long event, void *ptr)
 640 {
 641         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 642         struct batadv_hard_iface *hard_iface;
 643         struct batadv_hard_iface *primary_if = NULL;
 644         struct batadv_priv *bat_priv;
 645
 646         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 647                 batadv_sysfs_add_meshif(net_dev);
 648                 bat_priv = netdev_priv(net_dev);
 649                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 650                 return NOTIFY_DONE;
 651         }
 652
 653         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 654         if (!hard_iface && event == NETDEV_REGISTER)
 655                 hard_iface = batadv_hardif_add_interface(net_dev);
 656
 657         if (!hard_iface)
 658                 goto out;
 659
 660         switch (event) {
 661         case NETDEV_UP:
 662                 batadv_hardif_activate_interface(hard_iface);
 663                 break;
 664         case NETDEV_GOING_DOWN:
 665         case NETDEV_DOWN:
 666                 batadv_hardif_deactivate_interface(hard_iface);
 667                 break;
 668         case NETDEV_UNREGISTER:
 669                 list_del_rcu(&hard_iface->list);
 670
 671                 batadv_hardif_remove_interface(hard_iface);
 672                 break;
 673         case NETDEV_CHANGEMTU:
 674                 if (hard_iface->soft_iface)
 675                         batadv_update_min_mtu(hard_iface->soft_iface);
 676                 break;
 677         case NETDEV_CHANGEADDR:
 678                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 679                         goto hardif_put;
 680
 681                 batadv_check_known_mac_addr(hard_iface->net_dev);
 682
 683                 bat_priv = netdev_priv(hard_iface->soft_iface);
 684                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 685
 686                 primary_if = batadv_primary_if_get_selected(bat_priv);
 687                 if (!primary_if)
 688                         goto hardif_put;
 689
 690                 if (hard_iface == primary_if)
 691                         batadv_primary_if_update_addr(bat_priv, NULL);
 692                 break;
 693         default:
 694                 break;
 695         }
 696
 697 hardif_put:
 698         batadv_hardif_free_ref(hard_iface);
 699 out:
 700         if (primary_if)
 701                 batadv_hardif_free_ref(primary_if);
 702         return NOTIFY_DONE;
 703 }
 704
 705 struct notifier_block batadv_hard_if_notifier = {
 706         .notifier_call = batadv_hard_if_event,
 707 };