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
  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         if (parent_dev)
  98                 dev_put(parent_dev);
  99         return ret;
 100 }
 101
 102 static int batadv_is_valid_iface(const struct net_device *net_dev)
 103 {
 104         if (net_dev->flags & IFF_LOOPBACK)
 105                 return 0;
 106
 107         if (net_dev->type != ARPHRD_ETHER)
 108                 return 0;
 109
 110         if (net_dev->addr_len != ETH_ALEN)
 111                 return 0;
 112
 113         /* no batman over batman */
 114         if (batadv_is_on_batman_iface(net_dev))
 115                 return 0;
 116
 117         return 1;
 118 }
 119
 120 /**
 121  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 122  *  interface
 123  * @net_device: the device to check
 124  *
 125  * Returns true if the net device is a 802.11 wireless device, false otherwise.
 126  */
 127 static bool batadv_is_wifi_netdev(struct net_device *net_device)
 128 {
 129 #ifdef CONFIG_WIRELESS_EXT
 130         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 131          * check for wireless_handlers != NULL
 132          */
 133         if (net_device->wireless_handlers)
 134                 return true;
 135 #endif
 136
 137         /* cfg80211 drivers have to set ieee80211_ptr */
 138         if (net_device->ieee80211_ptr)
 139                 return true;
 140
 141         return false;
 142 }
 143
 144 /**
 145  * batadv_is_wifi_iface - check if the given interface represented by ifindex
 146  *  is a wifi interface
 147  * @ifindex: interface index to check
 148  *
 149  * Returns true if the interface represented by ifindex is a 802.11 wireless
 150  * device, false otherwise.
 151  */
 152 bool batadv_is_wifi_iface(int ifindex)
 153 {
 154         struct net_device *net_device = NULL;
 155         bool ret = false;
 156
 157         if (ifindex == BATADV_NULL_IFINDEX)
 158                 goto out;
 159
 160         net_device = dev_get_by_index(&init_net, ifindex);
 161         if (!net_device)
 162                 goto out;
 163
 164         ret = batadv_is_wifi_netdev(net_device);
 165
 166 out:
 167         if (net_device)
 168                 dev_put(net_device);
 169         return ret;
 170 }
 171
 172 static struct batadv_hard_iface *
 173 batadv_hardif_get_active(const struct net_device *soft_iface)
 174 {
 175         struct batadv_hard_iface *hard_iface;
 176
 177         rcu_read_lock();
 178         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 179                 if (hard_iface->soft_iface != soft_iface)
 180                         continue;
 181
 182                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 183                     atomic_inc_not_zero(&hard_iface->refcount))
 184                         goto out;
 185         }
 186
 187         hard_iface = NULL;
 188
 189 out:
 190         rcu_read_unlock();
 191         return hard_iface;
 192 }
 193
 194 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 195                                           struct batadv_hard_iface *oldif)
 196 {
 197         struct batadv_hard_iface *primary_if;
 198
 199         primary_if = batadv_primary_if_get_selected(bat_priv);
 200         if (!primary_if)
 201                 goto out;
 202
 203         batadv_dat_init_own_addr(bat_priv, primary_if);
 204         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 205 out:
 206         if (primary_if)
 207                 batadv_hardif_free_ref(primary_if);
 208 }
 209
 210 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 211                                      struct batadv_hard_iface *new_hard_iface)
 212 {
 213         struct batadv_hard_iface *curr_hard_iface;
 214
 215         ASSERT_RTNL();
 216
 217         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 218                 new_hard_iface = NULL;
 219
 220         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 221         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 222
 223         if (!new_hard_iface)
 224                 goto out;
 225
 226         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 227         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 228
 229 out:
 230         if (curr_hard_iface)
 231                 batadv_hardif_free_ref(curr_hard_iface);
 232 }
 233
 234 static bool
 235 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 236 {
 237         if (hard_iface->net_dev->flags & IFF_UP)
 238                 return true;
 239
 240         return false;
 241 }
 242
 243 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 244 {
 245         const struct batadv_hard_iface *hard_iface;
 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->net_dev == net_dev)
 254                         continue;
 255
 256                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 257                                         net_dev->dev_addr))
 258                         continue;
 259
 260                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 261                         net_dev->dev_addr, hard_iface->net_dev->name);
 262                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 263         }
 264         rcu_read_unlock();
 265 }
 266
 267 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 268 {
 269         const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 270         const struct batadv_hard_iface *hard_iface;
 271         /* allow big frames if all devices are capable to do so
 272          * (have MTU > 1500 + batadv_max_header_len())
 273          */
 274         int min_mtu = ETH_DATA_LEN;
 275         int max_header_len = batadv_max_header_len();
 276
 277         if (atomic_read(&bat_priv->fragmentation))
 278                 goto out;
 279
 280         rcu_read_lock();
 281         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 282                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 283                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 284                         continue;
 285
 286                 if (hard_iface->soft_iface != soft_iface)
 287                         continue;
 288
 289                 min_mtu = min_t(int, hard_iface->net_dev->mtu - max_header_len,
 290                                 min_mtu);
 291         }
 292         rcu_read_unlock();
 293 out:
 294         return min_mtu;
 295 }
 296
 297 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 298 void batadv_update_min_mtu(struct net_device *soft_iface)
 299 {
 300         int min_mtu;
 301
 302         min_mtu = batadv_hardif_min_mtu(soft_iface);
 303         if (soft_iface->mtu != min_mtu)
 304                 soft_iface->mtu = min_mtu;
 305 }
 306
 307 static void
 308 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 309 {
 310         struct batadv_priv *bat_priv;
 311         struct batadv_hard_iface *primary_if = NULL;
 312
 313         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 314                 goto out;
 315
 316         bat_priv = netdev_priv(hard_iface->soft_iface);
 317
 318         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 319         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 320
 321         /* the first active interface becomes our primary interface or
 322          * the next active interface after the old primary interface was removed
 323          */
 324         primary_if = batadv_primary_if_get_selected(bat_priv);
 325         if (!primary_if)
 326                 batadv_primary_if_select(bat_priv, hard_iface);
 327
 328         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 329                     hard_iface->net_dev->name);
 330
 331         batadv_update_min_mtu(hard_iface->soft_iface);
 332
 333 out:
 334         if (primary_if)
 335                 batadv_hardif_free_ref(primary_if);
 336 }
 337
 338 static void
 339 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 340 {
 341         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 342             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 343                 return;
 344
 345         hard_iface->if_status = BATADV_IF_INACTIVE;
 346
 347         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 348                     hard_iface->net_dev->name);
 349
 350         batadv_update_min_mtu(hard_iface->soft_iface);
 351 }
 352
 353 /**
 354  * batadv_master_del_slave - remove hard_iface from the current master interface
 355  * @slave: the interface enslaved in another master
 356  * @master: the master from which slave has to be removed
 357  *
 358  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 359  * is free'd and master can correctly change its internal state.
 360  * Return 0 on success, a negative value representing the error otherwise
 361  */
 362 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 363                                    struct net_device *master)
 364 {
 365         int ret;
 366
 367         if (!master)
 368                 return 0;
 369
 370         ret = -EBUSY;
 371         if (master->netdev_ops->ndo_del_slave)
 372                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 373
 374         return ret;
 375 }
 376
 377 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 378                                    const char *iface_name)
 379 {
 380         struct batadv_priv *bat_priv;
 381         struct net_device *soft_iface, *master;
 382         __be16 ethertype = htons(ETH_P_BATMAN);
 383         int max_header_len = batadv_max_header_len();
 384         int ret;
 385
 386         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 387                 goto out;
 388
 389         if (!atomic_inc_not_zero(&hard_iface->refcount))
 390                 goto out;
 391
 392         soft_iface = dev_get_by_name(&init_net, iface_name);
 393
 394         if (!soft_iface) {
 395                 soft_iface = batadv_softif_create(iface_name);
 396
 397                 if (!soft_iface) {
 398                         ret = -ENOMEM;
 399                         goto err;
 400                 }
 401
 402                 /* dev_get_by_name() increases the reference counter for us */
 403                 dev_hold(soft_iface);
 404         }
 405
 406         if (!batadv_softif_is_valid(soft_iface)) {
 407                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 408                        soft_iface->name);
 409                 ret = -EINVAL;
 410                 goto err_dev;
 411         }
 412
 413         /* check if the interface is enslaved in another virtual one and
 414          * in that case unlink it first
 415          */
 416         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 417         ret = batadv_master_del_slave(hard_iface, master);
 418         if (ret)
 419                 goto err_dev;
 420
 421         hard_iface->soft_iface = soft_iface;
 422         bat_priv = netdev_priv(hard_iface->soft_iface);
 423
 424         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 425         if (ret)
 426                 goto err_dev;
 427
 428         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 429         if (ret < 0)
 430                 goto err_upper;
 431
 432         hard_iface->if_num = bat_priv->num_ifaces;
 433         bat_priv->num_ifaces++;
 434         hard_iface->if_status = BATADV_IF_INACTIVE;
 435         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 436         if (ret < 0) {
 437                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 438                 bat_priv->num_ifaces--;
 439                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 440                 goto err_upper;
 441         }
 442
 443         hard_iface->batman_adv_ptype.type = ethertype;
 444         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 445         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 446         dev_add_pack(&hard_iface->batman_adv_ptype);
 447
 448         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 449                     hard_iface->net_dev->name);
 450
 451         if (atomic_read(&bat_priv->fragmentation) &&
 452             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 453                 batadv_info(hard_iface->soft_iface,
 454                             "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",
 455                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 456                             ETH_DATA_LEN + max_header_len);
 457
 458         if (!atomic_read(&bat_priv->fragmentation) &&
 459             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 460                 batadv_info(hard_iface->soft_iface,
 461                             "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",
 462                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 463                             ETH_DATA_LEN + max_header_len);
 464
 465         if (batadv_hardif_is_iface_up(hard_iface))
 466                 batadv_hardif_activate_interface(hard_iface);
 467         else
 468                 batadv_err(hard_iface->soft_iface,
 469                            "Not using interface %s (retrying later): interface not active\n",
 470                            hard_iface->net_dev->name);
 471
 472         /* begin scheduling originator messages on that interface */
 473         batadv_schedule_bat_ogm(hard_iface);
 474
 475 out:
 476         return 0;
 477
 478 err_upper:
 479         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 480 err_dev:
 481         hard_iface->soft_iface = NULL;
 482         dev_put(soft_iface);
 483 err:
 484         batadv_hardif_free_ref(hard_iface);
 485         return ret;
 486 }
 487
 488 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 489                                      enum batadv_hard_if_cleanup autodel)
 490 {
 491         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 492         struct batadv_hard_iface *primary_if = NULL;
 493
 494         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 495                 batadv_hardif_deactivate_interface(hard_iface);
 496
 497         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 498                 goto out;
 499
 500         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 501                     hard_iface->net_dev->name);
 502         dev_remove_pack(&hard_iface->batman_adv_ptype);
 503
 504         bat_priv->num_ifaces--;
 505         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 506
 507         primary_if = batadv_primary_if_get_selected(bat_priv);
 508         if (hard_iface == primary_if) {
 509                 struct batadv_hard_iface *new_if;
 510
 511                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 512                 batadv_primary_if_select(bat_priv, new_if);
 513
 514                 if (new_if)
 515                         batadv_hardif_free_ref(new_if);
 516         }
 517
 518         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 519         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 520
 521         /* delete all references to this hard_iface */
 522         batadv_purge_orig_ref(bat_priv);
 523         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 524         dev_put(hard_iface->soft_iface);
 525
 526         /* nobody uses this interface anymore */
 527         if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO)
 528                 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 529
 530         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 531         hard_iface->soft_iface = NULL;
 532         batadv_hardif_free_ref(hard_iface);
 533
 534 out:
 535         if (primary_if)
 536                 batadv_hardif_free_ref(primary_if);
 537 }
 538
 539 /**
 540  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 541  * @work: work queue item
 542  *
 543  * Free the parts of the hard interface which can not be removed under
 544  * rtnl lock (to prevent deadlock situations).
 545  */
 546 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 547 {
 548         struct batadv_hard_iface *hard_iface;
 549
 550         hard_iface = container_of(work, struct batadv_hard_iface,
 551                                   cleanup_work);
 552
 553         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 554         batadv_hardif_free_ref(hard_iface);
 555 }
 556
 557 static struct batadv_hard_iface *
 558 batadv_hardif_add_interface(struct net_device *net_dev)
 559 {
 560         struct batadv_hard_iface *hard_iface;
 561         int ret;
 562
 563         ASSERT_RTNL();
 564
 565         ret = batadv_is_valid_iface(net_dev);
 566         if (ret != 1)
 567                 goto out;
 568
 569         dev_hold(net_dev);
 570
 571         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 572         if (!hard_iface)
 573                 goto release_dev;
 574
 575         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 576         if (ret)
 577                 goto free_if;
 578
 579         hard_iface->if_num = -1;
 580         hard_iface->net_dev = net_dev;
 581         hard_iface->soft_iface = NULL;
 582         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 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_if:
 600         kfree(hard_iface);
 601 release_dev:
 602         dev_put(net_dev);
 603 out:
 604         return NULL;
 605 }
 606
 607 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 608 {
 609         ASSERT_RTNL();
 610
 611         /* first deactivate interface */
 612         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 613                 batadv_hardif_disable_interface(hard_iface,
 614                                                 BATADV_IF_CLEANUP_AUTO);
 615
 616         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 617                 return;
 618
 619         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 620         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 621 }
 622
 623 void batadv_hardif_remove_interfaces(void)
 624 {
 625         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 626
 627         rtnl_lock();
 628         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 629                                  &batadv_hardif_list, list) {
 630                 list_del_rcu(&hard_iface->list);
 631                 batadv_hardif_remove_interface(hard_iface);
 632         }
 633         rtnl_unlock();
 634 }
 635
 636 static int batadv_hard_if_event(struct notifier_block *this,
 637                                 unsigned long event, void *ptr)
 638 {
 639         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 640         struct batadv_hard_iface *hard_iface;
 641         struct batadv_hard_iface *primary_if = NULL;
 642         struct batadv_priv *bat_priv;
 643
 644         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 645                 batadv_sysfs_add_meshif(net_dev);
 646                 bat_priv = netdev_priv(net_dev);
 647                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 648                 return NOTIFY_DONE;
 649         }
 650
 651         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 652         if (!hard_iface && event == NETDEV_REGISTER)
 653                 hard_iface = batadv_hardif_add_interface(net_dev);
 654
 655         if (!hard_iface)
 656                 goto out;
 657
 658         switch (event) {
 659         case NETDEV_UP:
 660                 batadv_hardif_activate_interface(hard_iface);
 661                 break;
 662         case NETDEV_GOING_DOWN:
 663         case NETDEV_DOWN:
 664                 batadv_hardif_deactivate_interface(hard_iface);
 665                 break;
 666         case NETDEV_UNREGISTER:
 667                 list_del_rcu(&hard_iface->list);
 668
 669                 batadv_hardif_remove_interface(hard_iface);
 670                 break;
 671         case NETDEV_CHANGEMTU:
 672                 if (hard_iface->soft_iface)
 673                         batadv_update_min_mtu(hard_iface->soft_iface);
 674                 break;
 675         case NETDEV_CHANGEADDR:
 676                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 677                         goto hardif_put;
 678
 679                 batadv_check_known_mac_addr(hard_iface->net_dev);
 680
 681                 bat_priv = netdev_priv(hard_iface->soft_iface);
 682                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 683
 684                 primary_if = batadv_primary_if_get_selected(bat_priv);
 685                 if (!primary_if)
 686                         goto hardif_put;
 687
 688                 if (hard_iface == primary_if)
 689                         batadv_primary_if_update_addr(bat_priv, NULL);
 690                 break;
 691         default:
 692                 break;
 693         }
 694
 695 hardif_put:
 696         batadv_hardif_free_ref(hard_iface);
 697 out:
 698         if (primary_if)
 699                 batadv_hardif_free_ref(primary_if);
 700         return NOTIFY_DONE;
 701 }
 702
 703 struct notifier_block batadv_hard_if_notifier = {
 704         .notifier_call = batadv_hard_if_event,
 705 };