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         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 bool batadv_is_wifi_netdev(struct net_device *net_device)
 128 {
 129         if (!net_device)
 130                 return false;
 131
 132 #ifdef CONFIG_WIRELESS_EXT
 133         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 134          * check for wireless_handlers != NULL
 135          */
 136         if (net_device->wireless_handlers)
 137                 return true;
 138 #endif
 139
 140         /* cfg80211 drivers have to set ieee80211_ptr */
 141         if (net_device->ieee80211_ptr)
 142                 return true;
 143
 144         return false;
 145 }
 146
 147 static struct batadv_hard_iface *
 148 batadv_hardif_get_active(const struct net_device *soft_iface)
 149 {
 150         struct batadv_hard_iface *hard_iface;
 151
 152         rcu_read_lock();
 153         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 154                 if (hard_iface->soft_iface != soft_iface)
 155                         continue;
 156
 157                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 158                     atomic_inc_not_zero(&hard_iface->refcount))
 159                         goto out;
 160         }
 161
 162         hard_iface = NULL;
 163
 164 out:
 165         rcu_read_unlock();
 166         return hard_iface;
 167 }
 168
 169 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 170                                           struct batadv_hard_iface *oldif)
 171 {
 172         struct batadv_hard_iface *primary_if;
 173
 174         primary_if = batadv_primary_if_get_selected(bat_priv);
 175         if (!primary_if)
 176                 goto out;
 177
 178         batadv_dat_init_own_addr(bat_priv, primary_if);
 179         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 180 out:
 181         if (primary_if)
 182                 batadv_hardif_free_ref(primary_if);
 183 }
 184
 185 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 186                                      struct batadv_hard_iface *new_hard_iface)
 187 {
 188         struct batadv_hard_iface *curr_hard_iface;
 189
 190         ASSERT_RTNL();
 191
 192         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 193                 new_hard_iface = NULL;
 194
 195         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 196         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 197
 198         if (!new_hard_iface)
 199                 goto out;
 200
 201         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 202         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 203
 204 out:
 205         if (curr_hard_iface)
 206                 batadv_hardif_free_ref(curr_hard_iface);
 207 }
 208
 209 static bool
 210 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 211 {
 212         if (hard_iface->net_dev->flags & IFF_UP)
 213                 return true;
 214
 215         return false;
 216 }
 217
 218 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 219 {
 220         const struct batadv_hard_iface *hard_iface;
 221
 222         rcu_read_lock();
 223         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 224                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 225                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 226                         continue;
 227
 228                 if (hard_iface->net_dev == net_dev)
 229                         continue;
 230
 231                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 232                                         net_dev->dev_addr))
 233                         continue;
 234
 235                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 236                         net_dev->dev_addr, hard_iface->net_dev->name);
 237                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 238         }
 239         rcu_read_unlock();
 240 }
 241
 242 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 243 {
 244         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 245         const struct batadv_hard_iface *hard_iface;
 246         int min_mtu = ETH_DATA_LEN;
 247
 248         rcu_read_lock();
 249         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 250                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 251                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 252                         continue;
 253
 254                 if (hard_iface->soft_iface != soft_iface)
 255                         continue;
 256
 257                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 258         }
 259         rcu_read_unlock();
 260
 261         atomic_set(&bat_priv->packet_size_max, min_mtu);
 262
 263         if (atomic_read(&bat_priv->fragmentation) == 0)
 264                 goto out;
 265
 266         /* with fragmentation enabled the maximum size of internally generated
 267          * packets such as translation table exchanges or tvlv containers, etc
 268          * has to be calculated
 269          */
 270         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 271         min_mtu -= sizeof(struct batadv_frag_packet);
 272         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 273         atomic_set(&bat_priv->packet_size_max, min_mtu);
 274
 275         /* with fragmentation enabled we can fragment external packets easily */
 276         min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
 277
 278 out:
 279         return min_mtu - batadv_max_header_len();
 280 }
 281
 282 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 283 void batadv_update_min_mtu(struct net_device *soft_iface)
 284 {
 285         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 286
 287         /* Check if the local translate table should be cleaned up to match a
 288          * new (and smaller) MTU.
 289          */
 290         batadv_tt_local_resize_to_mtu(soft_iface);
 291 }
 292
 293 static void
 294 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 295 {
 296         struct batadv_priv *bat_priv;
 297         struct batadv_hard_iface *primary_if = NULL;
 298
 299         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 300                 goto out;
 301
 302         bat_priv = netdev_priv(hard_iface->soft_iface);
 303
 304         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 305         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 306
 307         /* the first active interface becomes our primary interface or
 308          * the next active interface after the old primary interface was removed
 309          */
 310         primary_if = batadv_primary_if_get_selected(bat_priv);
 311         if (!primary_if)
 312                 batadv_primary_if_select(bat_priv, hard_iface);
 313
 314         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 315                     hard_iface->net_dev->name);
 316
 317         batadv_update_min_mtu(hard_iface->soft_iface);
 318
 319 out:
 320         if (primary_if)
 321                 batadv_hardif_free_ref(primary_if);
 322 }
 323
 324 static void
 325 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 326 {
 327         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 328             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 329                 return;
 330
 331         hard_iface->if_status = BATADV_IF_INACTIVE;
 332
 333         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 334                     hard_iface->net_dev->name);
 335
 336         batadv_update_min_mtu(hard_iface->soft_iface);
 337 }
 338
 339 /**
 340  * batadv_master_del_slave - remove hard_iface from the current master interface
 341  * @slave: the interface enslaved in another master
 342  * @master: the master from which slave has to be removed
 343  *
 344  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 345  * is free'd and master can correctly change its internal state.
 346  * Return 0 on success, a negative value representing the error otherwise
 347  */
 348 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 349                                    struct net_device *master)
 350 {
 351         int ret;
 352
 353         if (!master)
 354                 return 0;
 355
 356         ret = -EBUSY;
 357         if (master->netdev_ops->ndo_del_slave)
 358                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 359
 360         return ret;
 361 }
 362
 363 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 364                                    const char *iface_name)
 365 {
 366         struct batadv_priv *bat_priv;
 367         struct net_device *soft_iface, *master;
 368         __be16 ethertype = htons(ETH_P_BATMAN);
 369         int max_header_len = batadv_max_header_len();
 370         int ret;
 371
 372         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 373                 goto out;
 374
 375         if (!atomic_inc_not_zero(&hard_iface->refcount))
 376                 goto out;
 377
 378         soft_iface = dev_get_by_name(&init_net, iface_name);
 379
 380         if (!soft_iface) {
 381                 soft_iface = batadv_softif_create(iface_name);
 382
 383                 if (!soft_iface) {
 384                         ret = -ENOMEM;
 385                         goto err;
 386                 }
 387
 388                 /* dev_get_by_name() increases the reference counter for us */
 389                 dev_hold(soft_iface);
 390         }
 391
 392         if (!batadv_softif_is_valid(soft_iface)) {
 393                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 394                        soft_iface->name);
 395                 ret = -EINVAL;
 396                 goto err_dev;
 397         }
 398
 399         /* check if the interface is enslaved in another virtual one and
 400          * in that case unlink it first
 401          */
 402         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 403         ret = batadv_master_del_slave(hard_iface, master);
 404         if (ret)
 405                 goto err_dev;
 406
 407         hard_iface->soft_iface = soft_iface;
 408         bat_priv = netdev_priv(hard_iface->soft_iface);
 409
 410         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 411         if (ret)
 412                 goto err_dev;
 413
 414         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 415         if (ret < 0)
 416                 goto err_upper;
 417
 418         hard_iface->if_num = bat_priv->num_ifaces;
 419         bat_priv->num_ifaces++;
 420         hard_iface->if_status = BATADV_IF_INACTIVE;
 421         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 422         if (ret < 0) {
 423                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 424                 bat_priv->num_ifaces--;
 425                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 426                 goto err_upper;
 427         }
 428
 429         hard_iface->batman_adv_ptype.type = ethertype;
 430         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 431         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 432         dev_add_pack(&hard_iface->batman_adv_ptype);
 433
 434         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 435                     hard_iface->net_dev->name);
 436
 437         if (atomic_read(&bat_priv->fragmentation) &&
 438             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 439                 batadv_info(hard_iface->soft_iface,
 440                             "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",
 441                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 442                             ETH_DATA_LEN + max_header_len);
 443
 444         if (!atomic_read(&bat_priv->fragmentation) &&
 445             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 446                 batadv_info(hard_iface->soft_iface,
 447                             "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",
 448                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 449                             ETH_DATA_LEN + max_header_len);
 450
 451         if (batadv_hardif_is_iface_up(hard_iface))
 452                 batadv_hardif_activate_interface(hard_iface);
 453         else
 454                 batadv_err(hard_iface->soft_iface,
 455                            "Not using interface %s (retrying later): interface not active\n",
 456                            hard_iface->net_dev->name);
 457
 458         /* begin scheduling originator messages on that interface */
 459         batadv_schedule_bat_ogm(hard_iface);
 460
 461 out:
 462         return 0;
 463
 464 err_upper:
 465         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 466 err_dev:
 467         hard_iface->soft_iface = NULL;
 468         dev_put(soft_iface);
 469 err:
 470         batadv_hardif_free_ref(hard_iface);
 471         return ret;
 472 }
 473
 474 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 475                                      enum batadv_hard_if_cleanup autodel)
 476 {
 477         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 478         struct batadv_hard_iface *primary_if = NULL;
 479
 480         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 481                 batadv_hardif_deactivate_interface(hard_iface);
 482
 483         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 484                 goto out;
 485
 486         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 487                     hard_iface->net_dev->name);
 488         dev_remove_pack(&hard_iface->batman_adv_ptype);
 489
 490         bat_priv->num_ifaces--;
 491         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 492
 493         primary_if = batadv_primary_if_get_selected(bat_priv);
 494         if (hard_iface == primary_if) {
 495                 struct batadv_hard_iface *new_if;
 496
 497                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 498                 batadv_primary_if_select(bat_priv, new_if);
 499
 500                 if (new_if)
 501                         batadv_hardif_free_ref(new_if);
 502         }
 503
 504         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 505         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 506
 507         /* delete all references to this hard_iface */
 508         batadv_purge_orig_ref(bat_priv);
 509         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 510         dev_put(hard_iface->soft_iface);
 511
 512         /* nobody uses this interface anymore */
 513         if (!bat_priv->num_ifaces) {
 514                 batadv_gw_check_client_stop(bat_priv);
 515
 516                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 517                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 518         }
 519
 520         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 521         hard_iface->soft_iface = NULL;
 522         batadv_hardif_free_ref(hard_iface);
 523
 524 out:
 525         if (primary_if)
 526                 batadv_hardif_free_ref(primary_if);
 527 }
 528
 529 /**
 530  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 531  * @work: work queue item
 532  *
 533  * Free the parts of the hard interface which can not be removed under
 534  * rtnl lock (to prevent deadlock situations).
 535  */
 536 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 537 {
 538         struct batadv_hard_iface *hard_iface;
 539
 540         hard_iface = container_of(work, struct batadv_hard_iface,
 541                                   cleanup_work);
 542
 543         batadv_debugfs_del_hardif(hard_iface);
 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
 575         ret = batadv_debugfs_add_hardif(hard_iface);
 576         if (ret)
 577                 goto free_sysfs;
 578
 579         INIT_LIST_HEAD(&hard_iface->list);
 580         INIT_WORK(&hard_iface->cleanup_work,
 581                   batadv_hardif_remove_interface_finish);
 582
 583         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 584         if (batadv_is_wifi_netdev(net_dev))
 585                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 586
 587         /* extra reference for return */
 588         atomic_set(&hard_iface->refcount, 2);
 589
 590         batadv_check_known_mac_addr(hard_iface->net_dev);
 591         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 592
 593         return hard_iface;
 594
 595 free_sysfs:
 596         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 597 free_if:
 598         kfree(hard_iface);
 599 release_dev:
 600         dev_put(net_dev);
 601 out:
 602         return NULL;
 603 }
 604
 605 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 606 {
 607         ASSERT_RTNL();
 608
 609         /* first deactivate interface */
 610         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 611                 batadv_hardif_disable_interface(hard_iface,
 612                                                 BATADV_IF_CLEANUP_AUTO);
 613
 614         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 615                 return;
 616
 617         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 618         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 619 }
 620
 621 void batadv_hardif_remove_interfaces(void)
 622 {
 623         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 624
 625         rtnl_lock();
 626         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 627                                  &batadv_hardif_list, list) {
 628                 list_del_rcu(&hard_iface->list);
 629                 batadv_hardif_remove_interface(hard_iface);
 630         }
 631         rtnl_unlock();
 632 }
 633
 634 static int batadv_hard_if_event(struct notifier_block *this,
 635                                 unsigned long event, void *ptr)
 636 {
 637         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 638         struct batadv_hard_iface *hard_iface;
 639         struct batadv_hard_iface *primary_if = NULL;
 640         struct batadv_priv *bat_priv;
 641
 642         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 643                 batadv_sysfs_add_meshif(net_dev);
 644                 bat_priv = netdev_priv(net_dev);
 645                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 646                 return NOTIFY_DONE;
 647         }
 648
 649         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 650         if (!hard_iface && event == NETDEV_REGISTER)
 651                 hard_iface = batadv_hardif_add_interface(net_dev);
 652
 653         if (!hard_iface)
 654                 goto out;
 655
 656         switch (event) {
 657         case NETDEV_UP:
 658                 batadv_hardif_activate_interface(hard_iface);
 659                 break;
 660         case NETDEV_GOING_DOWN:
 661         case NETDEV_DOWN:
 662                 batadv_hardif_deactivate_interface(hard_iface);
 663                 break;
 664         case NETDEV_UNREGISTER:
 665                 list_del_rcu(&hard_iface->list);
 666
 667                 batadv_hardif_remove_interface(hard_iface);
 668                 break;
 669         case NETDEV_CHANGEMTU:
 670                 if (hard_iface->soft_iface)
 671                         batadv_update_min_mtu(hard_iface->soft_iface);
 672                 break;
 673         case NETDEV_CHANGEADDR:
 674                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 675                         goto hardif_put;
 676
 677                 batadv_check_known_mac_addr(hard_iface->net_dev);
 678
 679                 bat_priv = netdev_priv(hard_iface->soft_iface);
 680                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 681
 682                 primary_if = batadv_primary_if_get_selected(bat_priv);
 683                 if (!primary_if)
 684                         goto hardif_put;
 685
 686                 if (hard_iface == primary_if)
 687                         batadv_primary_if_update_addr(bat_priv, NULL);
 688                 break;
 689         default:
 690                 break;
 691         }
 692
 693 hardif_put:
 694         batadv_hardif_free_ref(hard_iface);
 695 out:
 696         if (primary_if)
 697                 batadv_hardif_free_ref(primary_if);
 698         return NOTIFY_DONE;
 699 }
 700
 701 struct notifier_block batadv_hard_if_notifier = {
 702         .notifier_call = batadv_hard_if_event,
 703 };