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 = ETH_DATA_LEN;
 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         atomic_set(&bat_priv->packet_size_max, min_mtu);
 260
 261         if (atomic_read(&bat_priv->fragmentation) == 0)
 262                 goto out;
 263
 264         /* with fragmentation enabled the maximum size of internally generated
 265          * packets such as translation table exchanges or tvlv containers, etc
 266          * has to be calculated
 267          */
 268         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 269         min_mtu -= sizeof(struct batadv_frag_packet);
 270         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 271         atomic_set(&bat_priv->packet_size_max, min_mtu);
 272
 273         /* with fragmentation enabled we can fragment external packets easily */
 274         min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
 275
 276 out:
 277         return min_mtu - batadv_max_header_len();
 278 }
 279
 280 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 281 void batadv_update_min_mtu(struct net_device *soft_iface)
 282 {
 283         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 284
 285         /* Check if the local translate table should be cleaned up to match a
 286          * new (and smaller) MTU.
 287          */
 288         batadv_tt_local_resize_to_mtu(soft_iface);
 289 }
 290
 291 static void
 292 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 293 {
 294         struct batadv_priv *bat_priv;
 295         struct batadv_hard_iface *primary_if = NULL;
 296
 297         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 298                 goto out;
 299
 300         bat_priv = netdev_priv(hard_iface->soft_iface);
 301
 302         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 303         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 304
 305         /* the first active interface becomes our primary interface or
 306          * the next active interface after the old primary interface was removed
 307          */
 308         primary_if = batadv_primary_if_get_selected(bat_priv);
 309         if (!primary_if)
 310                 batadv_primary_if_select(bat_priv, hard_iface);
 311
 312         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 313                     hard_iface->net_dev->name);
 314
 315         batadv_update_min_mtu(hard_iface->soft_iface);
 316
 317 out:
 318         if (primary_if)
 319                 batadv_hardif_free_ref(primary_if);
 320 }
 321
 322 static void
 323 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 324 {
 325         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 326             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 327                 return;
 328
 329         hard_iface->if_status = BATADV_IF_INACTIVE;
 330
 331         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 332                     hard_iface->net_dev->name);
 333
 334         batadv_update_min_mtu(hard_iface->soft_iface);
 335 }
 336
 337 /**
 338  * batadv_master_del_slave - remove hard_iface from the current master interface
 339  * @slave: the interface enslaved in another master
 340  * @master: the master from which slave has to be removed
 341  *
 342  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 343  * is free'd and master can correctly change its internal state.
 344  * Return 0 on success, a negative value representing the error otherwise
 345  */
 346 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 347                                    struct net_device *master)
 348 {
 349         int ret;
 350
 351         if (!master)
 352                 return 0;
 353
 354         ret = -EBUSY;
 355         if (master->netdev_ops->ndo_del_slave)
 356                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 357
 358         return ret;
 359 }
 360
 361 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 362                                    const char *iface_name)
 363 {
 364         struct batadv_priv *bat_priv;
 365         struct net_device *soft_iface, *master;
 366         __be16 ethertype = htons(ETH_P_BATMAN);
 367         int max_header_len = batadv_max_header_len();
 368         int ret;
 369
 370         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 371                 goto out;
 372
 373         if (!atomic_inc_not_zero(&hard_iface->refcount))
 374                 goto out;
 375
 376         soft_iface = dev_get_by_name(&init_net, iface_name);
 377
 378         if (!soft_iface) {
 379                 soft_iface = batadv_softif_create(iface_name);
 380
 381                 if (!soft_iface) {
 382                         ret = -ENOMEM;
 383                         goto err;
 384                 }
 385
 386                 /* dev_get_by_name() increases the reference counter for us */
 387                 dev_hold(soft_iface);
 388         }
 389
 390         if (!batadv_softif_is_valid(soft_iface)) {
 391                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 392                        soft_iface->name);
 393                 ret = -EINVAL;
 394                 goto err_dev;
 395         }
 396
 397         /* check if the interface is enslaved in another virtual one and
 398          * in that case unlink it first
 399          */
 400         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 401         ret = batadv_master_del_slave(hard_iface, master);
 402         if (ret)
 403                 goto err_dev;
 404
 405         hard_iface->soft_iface = soft_iface;
 406         bat_priv = netdev_priv(hard_iface->soft_iface);
 407
 408         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 409         if (ret)
 410                 goto err_dev;
 411
 412         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 413         if (ret < 0)
 414                 goto err_upper;
 415
 416         hard_iface->if_num = bat_priv->num_ifaces;
 417         bat_priv->num_ifaces++;
 418         hard_iface->if_status = BATADV_IF_INACTIVE;
 419         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 420         if (ret < 0) {
 421                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 422                 bat_priv->num_ifaces--;
 423                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 424                 goto err_upper;
 425         }
 426
 427         hard_iface->batman_adv_ptype.type = ethertype;
 428         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 429         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 430         dev_add_pack(&hard_iface->batman_adv_ptype);
 431
 432         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 433                     hard_iface->net_dev->name);
 434
 435         if (atomic_read(&bat_priv->fragmentation) &&
 436             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 437                 batadv_info(hard_iface->soft_iface,
 438                             "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",
 439                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 440                             ETH_DATA_LEN + max_header_len);
 441
 442         if (!atomic_read(&bat_priv->fragmentation) &&
 443             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 444                 batadv_info(hard_iface->soft_iface,
 445                             "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",
 446                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 447                             ETH_DATA_LEN + max_header_len);
 448
 449         if (batadv_hardif_is_iface_up(hard_iface))
 450                 batadv_hardif_activate_interface(hard_iface);
 451         else
 452                 batadv_err(hard_iface->soft_iface,
 453                            "Not using interface %s (retrying later): interface not active\n",
 454                            hard_iface->net_dev->name);
 455
 456         /* begin scheduling originator messages on that interface */
 457         batadv_schedule_bat_ogm(hard_iface);
 458
 459 out:
 460         return 0;
 461
 462 err_upper:
 463         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 464 err_dev:
 465         hard_iface->soft_iface = NULL;
 466         dev_put(soft_iface);
 467 err:
 468         batadv_hardif_free_ref(hard_iface);
 469         return ret;
 470 }
 471
 472 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 473                                      enum batadv_hard_if_cleanup autodel)
 474 {
 475         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 476         struct batadv_hard_iface *primary_if = NULL;
 477
 478         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 479                 batadv_hardif_deactivate_interface(hard_iface);
 480
 481         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 482                 goto out;
 483
 484         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 485                     hard_iface->net_dev->name);
 486         dev_remove_pack(&hard_iface->batman_adv_ptype);
 487
 488         bat_priv->num_ifaces--;
 489         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 490
 491         primary_if = batadv_primary_if_get_selected(bat_priv);
 492         if (hard_iface == primary_if) {
 493                 struct batadv_hard_iface *new_if;
 494
 495                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 496                 batadv_primary_if_select(bat_priv, new_if);
 497
 498                 if (new_if)
 499                         batadv_hardif_free_ref(new_if);
 500         }
 501
 502         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 503         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 504
 505         /* delete all references to this hard_iface */
 506         batadv_purge_orig_ref(bat_priv);
 507         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 508         dev_put(hard_iface->soft_iface);
 509
 510         /* nobody uses this interface anymore */
 511         if (!bat_priv->num_ifaces) {
 512                 batadv_gw_check_client_stop(bat_priv);
 513
 514                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 515                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 516         }
 517
 518         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 519         hard_iface->soft_iface = NULL;
 520         batadv_hardif_free_ref(hard_iface);
 521
 522 out:
 523         if (primary_if)
 524                 batadv_hardif_free_ref(primary_if);
 525 }
 526
 527 /**
 528  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 529  * @work: work queue item
 530  *
 531  * Free the parts of the hard interface which can not be removed under
 532  * rtnl lock (to prevent deadlock situations).
 533  */
 534 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 535 {
 536         struct batadv_hard_iface *hard_iface;
 537
 538         hard_iface = container_of(work, struct batadv_hard_iface,
 539                                   cleanup_work);
 540
 541         batadv_debugfs_del_hardif(hard_iface);
 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
 573         ret = batadv_debugfs_add_hardif(hard_iface);
 574         if (ret)
 575                 goto free_sysfs;
 576
 577         INIT_LIST_HEAD(&hard_iface->list);
 578         INIT_WORK(&hard_iface->cleanup_work,
 579                   batadv_hardif_remove_interface_finish);
 580
 581         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 582         if (batadv_is_wifi_netdev(net_dev))
 583                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 584
 585         /* extra reference for return */
 586         atomic_set(&hard_iface->refcount, 2);
 587
 588         batadv_check_known_mac_addr(hard_iface->net_dev);
 589         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 590
 591         return hard_iface;
 592
 593 free_sysfs:
 594         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 595 free_if:
 596         kfree(hard_iface);
 597 release_dev:
 598         dev_put(net_dev);
 599 out:
 600         return NULL;
 601 }
 602
 603 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 604 {
 605         ASSERT_RTNL();
 606
 607         /* first deactivate interface */
 608         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 609                 batadv_hardif_disable_interface(hard_iface,
 610                                                 BATADV_IF_CLEANUP_AUTO);
 611
 612         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 613                 return;
 614
 615         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 616         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 617 }
 618
 619 void batadv_hardif_remove_interfaces(void)
 620 {
 621         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 622
 623         rtnl_lock();
 624         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 625                                  &batadv_hardif_list, list) {
 626                 list_del_rcu(&hard_iface->list);
 627                 batadv_hardif_remove_interface(hard_iface);
 628         }
 629         rtnl_unlock();
 630 }
 631
 632 static int batadv_hard_if_event(struct notifier_block *this,
 633                                 unsigned long event, void *ptr)
 634 {
 635         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 636         struct batadv_hard_iface *hard_iface;
 637         struct batadv_hard_iface *primary_if = NULL;
 638         struct batadv_priv *bat_priv;
 639
 640         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 641                 batadv_sysfs_add_meshif(net_dev);
 642                 bat_priv = netdev_priv(net_dev);
 643                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 644                 return NOTIFY_DONE;
 645         }
 646
 647         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 648         if (!hard_iface && event == NETDEV_REGISTER)
 649                 hard_iface = batadv_hardif_add_interface(net_dev);
 650
 651         if (!hard_iface)
 652                 goto out;
 653
 654         switch (event) {
 655         case NETDEV_UP:
 656                 batadv_hardif_activate_interface(hard_iface);
 657                 break;
 658         case NETDEV_GOING_DOWN:
 659         case NETDEV_DOWN:
 660                 batadv_hardif_deactivate_interface(hard_iface);
 661                 break;
 662         case NETDEV_UNREGISTER:
 663                 list_del_rcu(&hard_iface->list);
 664
 665                 batadv_hardif_remove_interface(hard_iface);
 666                 break;
 667         case NETDEV_CHANGEMTU:
 668                 if (hard_iface->soft_iface)
 669                         batadv_update_min_mtu(hard_iface->soft_iface);
 670                 break;
 671         case NETDEV_CHANGEADDR:
 672                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 673                         goto hardif_put;
 674
 675                 batadv_check_known_mac_addr(hard_iface->net_dev);
 676
 677                 bat_priv = netdev_priv(hard_iface->soft_iface);
 678                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 679
 680                 primary_if = batadv_primary_if_get_selected(bat_priv);
 681                 if (!primary_if)
 682                         goto hardif_put;
 683
 684                 if (hard_iface == primary_if)
 685                         batadv_primary_if_update_addr(bat_priv, NULL);
 686                 break;
 687         default:
 688                 break;
 689         }
 690
 691 hardif_put:
 692         batadv_hardif_free_ref(hard_iface);
 693 out:
 694         if (primary_if)
 695                 batadv_hardif_free_ref(primary_if);
 696         return NOTIFY_DONE;
 697 }
 698
 699 struct notifier_block batadv_hard_if_notifier = {
 700         .notifier_call = batadv_hard_if_event,
 701 };