kernel/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 (dev_get_iflink(net_dev) == 0 ||
  87             dev_get_iflink(net_dev) == net_dev->ifindex)
  88                 return false;
  89
  90         /* recurse over the parent device */
  91         parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev));
  92         /* if we got a NULL parent_dev there is something broken.. */
  93         if (WARN(!parent_dev, "Cannot find parent device"))
  94                 return false;
  95
  96         ret = batadv_is_on_batman_iface(parent_dev);
  97
  98         return ret;
  99 }
 100
 101 static int batadv_is_valid_iface(const struct net_device *net_dev)
 102 {
 103         if (net_dev->flags & IFF_LOOPBACK)
 104                 return 0;
 105
 106         if (net_dev->type != ARPHRD_ETHER)
 107                 return 0;
 108
 109         if (net_dev->addr_len != ETH_ALEN)
 110                 return 0;
 111
 112         /* no batman over batman */
 113         if (batadv_is_on_batman_iface(net_dev))
 114                 return 0;
 115
 116         return 1;
 117 }
 118
 119 /**
 120  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 121  *  interface
 122  * @net_device: the device to check
 123  *
 124  * Returns true if the net device is a 802.11 wireless device, false otherwise.
 125  */
 126 bool batadv_is_wifi_netdev(struct net_device *net_device)
 127 {
 128         if (!net_device)
 129                 return false;
 130
 131 #ifdef CONFIG_WIRELESS_EXT
 132         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 133          * check for wireless_handlers != NULL
 134          */
 135         if (net_device->wireless_handlers)
 136                 return true;
 137 #endif
 138
 139         /* cfg80211 drivers have to set ieee80211_ptr */
 140         if (net_device->ieee80211_ptr)
 141                 return true;
 142
 143         return false;
 144 }
 145
 146 static struct batadv_hard_iface *
 147 batadv_hardif_get_active(const struct net_device *soft_iface)
 148 {
 149         struct batadv_hard_iface *hard_iface;
 150
 151         rcu_read_lock();
 152         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 153                 if (hard_iface->soft_iface != soft_iface)
 154                         continue;
 155
 156                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 157                     atomic_inc_not_zero(&hard_iface->refcount))
 158                         goto out;
 159         }
 160
 161         hard_iface = NULL;
 162
 163 out:
 164         rcu_read_unlock();
 165         return hard_iface;
 166 }
 167
 168 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 169                                           struct batadv_hard_iface *oldif)
 170 {
 171         struct batadv_hard_iface *primary_if;
 172
 173         primary_if = batadv_primary_if_get_selected(bat_priv);
 174         if (!primary_if)
 175                 goto out;
 176
 177         batadv_dat_init_own_addr(bat_priv, primary_if);
 178         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 179 out:
 180         if (primary_if)
 181                 batadv_hardif_free_ref(primary_if);
 182 }
 183
 184 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 185                                      struct batadv_hard_iface *new_hard_iface)
 186 {
 187         struct batadv_hard_iface *curr_hard_iface;
 188
 189         ASSERT_RTNL();
 190
 191         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 192                 new_hard_iface = NULL;
 193
 194         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 195         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 196
 197         if (!new_hard_iface)
 198                 goto out;
 199
 200         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 201         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 202
 203 out:
 204         if (curr_hard_iface)
 205                 batadv_hardif_free_ref(curr_hard_iface);
 206 }
 207
 208 static bool
 209 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 210 {
 211         if (hard_iface->net_dev->flags & IFF_UP)
 212                 return true;
 213
 214         return false;
 215 }
 216
 217 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 218 {
 219         const struct batadv_hard_iface *hard_iface;
 220
 221         rcu_read_lock();
 222         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 223                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 224                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 225                         continue;
 226
 227                 if (hard_iface->net_dev == net_dev)
 228                         continue;
 229
 230                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 231                                         net_dev->dev_addr))
 232                         continue;
 233
 234                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 235                         net_dev->dev_addr, hard_iface->net_dev->name);
 236                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 237         }
 238         rcu_read_unlock();
 239 }
 240
 241 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 242 {
 243         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 244         const struct batadv_hard_iface *hard_iface;
 245         int min_mtu = INT_MAX;
 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->soft_iface != soft_iface)
 254                         continue;
 255
 256                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 257         }
 258         rcu_read_unlock();
 259
 260         if (atomic_read(&bat_priv->fragmentation) == 0)
 261                 goto out;
 262
 263         /* with fragmentation enabled the maximum size of internally generated
 264          * packets such as translation table exchanges or tvlv containers, etc
 265          * has to be calculated
 266          */
 267         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 268         min_mtu -= sizeof(struct batadv_frag_packet);
 269         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 270
 271 out:
 272         /* report to the other components the maximum amount of bytes that
 273          * batman-adv can send over the wire (without considering the payload
 274          * overhead). For example, this value is used by TT to compute the
 275          * maximum local table table size
 276          */
 277         atomic_set(&bat_priv->packet_size_max, min_mtu);
 278
 279         /* the real soft-interface MTU is computed by removing the payload
 280          * overhead from the maximum amount of bytes that was just computed.
 281          *
 282          * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
 283          */
 284         return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
 285 }
 286
 287 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 288 void batadv_update_min_mtu(struct net_device *soft_iface)
 289 {
 290         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 291
 292         /* Check if the local translate table should be cleaned up to match a
 293          * new (and smaller) MTU.
 294          */
 295         batadv_tt_local_resize_to_mtu(soft_iface);
 296 }
 297
 298 static void
 299 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 300 {
 301         struct batadv_priv *bat_priv;
 302         struct batadv_hard_iface *primary_if = NULL;
 303
 304         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 305                 goto out;
 306
 307         bat_priv = netdev_priv(hard_iface->soft_iface);
 308
 309         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 310         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 311
 312         /* the first active interface becomes our primary interface or
 313          * the next active interface after the old primary interface was removed
 314          */
 315         primary_if = batadv_primary_if_get_selected(bat_priv);
 316         if (!primary_if)
 317                 batadv_primary_if_select(bat_priv, hard_iface);
 318
 319         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 320                     hard_iface->net_dev->name);
 321
 322         batadv_update_min_mtu(hard_iface->soft_iface);
 323
 324 out:
 325         if (primary_if)
 326                 batadv_hardif_free_ref(primary_if);
 327 }
 328
 329 static void
 330 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 331 {
 332         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 333             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 334                 return;
 335
 336         hard_iface->if_status = BATADV_IF_INACTIVE;
 337
 338         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 339                     hard_iface->net_dev->name);
 340
 341         batadv_update_min_mtu(hard_iface->soft_iface);
 342 }
 343
 344 /**
 345  * batadv_master_del_slave - remove hard_iface from the current master interface
 346  * @slave: the interface enslaved in another master
 347  * @master: the master from which slave has to be removed
 348  *
 349  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 350  * is free'd and master can correctly change its internal state.
 351  * Return 0 on success, a negative value representing the error otherwise
 352  */
 353 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 354                                    struct net_device *master)
 355 {
 356         int ret;
 357
 358         if (!master)
 359                 return 0;
 360
 361         ret = -EBUSY;
 362         if (master->netdev_ops->ndo_del_slave)
 363                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 364
 365         return ret;
 366 }
 367
 368 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 369                                    const char *iface_name)
 370 {
 371         struct batadv_priv *bat_priv;
 372         struct net_device *soft_iface, *master;
 373         __be16 ethertype = htons(ETH_P_BATMAN);
 374         int max_header_len = batadv_max_header_len();
 375         int ret;
 376
 377         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 378                 goto out;
 379
 380         if (!atomic_inc_not_zero(&hard_iface->refcount))
 381                 goto out;
 382
 383         soft_iface = dev_get_by_name(&init_net, iface_name);
 384
 385         if (!soft_iface) {
 386                 soft_iface = batadv_softif_create(iface_name);
 387
 388                 if (!soft_iface) {
 389                         ret = -ENOMEM;
 390                         goto err;
 391                 }
 392
 393                 /* dev_get_by_name() increases the reference counter for us */
 394                 dev_hold(soft_iface);
 395         }
 396
 397         if (!batadv_softif_is_valid(soft_iface)) {
 398                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 399                        soft_iface->name);
 400                 ret = -EINVAL;
 401                 goto err_dev;
 402         }
 403
 404         /* check if the interface is enslaved in another virtual one and
 405          * in that case unlink it first
 406          */
 407         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 408         ret = batadv_master_del_slave(hard_iface, master);
 409         if (ret)
 410                 goto err_dev;
 411
 412         hard_iface->soft_iface = soft_iface;
 413         bat_priv = netdev_priv(hard_iface->soft_iface);
 414
 415         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 416         if (ret)
 417                 goto err_dev;
 418
 419         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 420         if (ret < 0)
 421                 goto err_upper;
 422
 423         hard_iface->if_num = bat_priv->num_ifaces;
 424         bat_priv->num_ifaces++;
 425         hard_iface->if_status = BATADV_IF_INACTIVE;
 426         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 427         if (ret < 0) {
 428                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 429                 bat_priv->num_ifaces--;
 430                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 431                 goto err_upper;
 432         }
 433
 434         hard_iface->batman_adv_ptype.type = ethertype;
 435         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 436         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 437         dev_add_pack(&hard_iface->batman_adv_ptype);
 438
 439         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 440                     hard_iface->net_dev->name);
 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. 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",
 446                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 447                             ETH_DATA_LEN + max_header_len);
 448
 449         if (!atomic_read(&bat_priv->fragmentation) &&
 450             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 451                 batadv_info(hard_iface->soft_iface,
 452                             "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",
 453                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 454                             ETH_DATA_LEN + max_header_len);
 455
 456         if (batadv_hardif_is_iface_up(hard_iface))
 457                 batadv_hardif_activate_interface(hard_iface);
 458         else
 459                 batadv_err(hard_iface->soft_iface,
 460                            "Not using interface %s (retrying later): interface not active\n",
 461                            hard_iface->net_dev->name);
 462
 463         /* begin scheduling originator messages on that interface */
 464         batadv_schedule_bat_ogm(hard_iface);
 465
 466 out:
 467         return 0;
 468
 469 err_upper:
 470         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 471 err_dev:
 472         hard_iface->soft_iface = NULL;
 473         dev_put(soft_iface);
 474 err:
 475         batadv_hardif_free_ref(hard_iface);
 476         return ret;
 477 }
 478
 479 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 480                                      enum batadv_hard_if_cleanup autodel)
 481 {
 482         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 483         struct batadv_hard_iface *primary_if = NULL;
 484
 485         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 486                 batadv_hardif_deactivate_interface(hard_iface);
 487
 488         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 489                 goto out;
 490
 491         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 492                     hard_iface->net_dev->name);
 493         dev_remove_pack(&hard_iface->batman_adv_ptype);
 494
 495         bat_priv->num_ifaces--;
 496         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 497
 498         primary_if = batadv_primary_if_get_selected(bat_priv);
 499         if (hard_iface == primary_if) {
 500                 struct batadv_hard_iface *new_if;
 501
 502                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 503                 batadv_primary_if_select(bat_priv, new_if);
 504
 505                 if (new_if)
 506                         batadv_hardif_free_ref(new_if);
 507         }
 508
 509         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 510         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 511
 512         /* delete all references to this hard_iface */
 513         batadv_purge_orig_ref(bat_priv);
 514         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 515         dev_put(hard_iface->soft_iface);
 516
 517         /* nobody uses this interface anymore */
 518         if (!bat_priv->num_ifaces) {
 519                 batadv_gw_check_client_stop(bat_priv);
 520
 521                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 522                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 523         }
 524
 525         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 526         hard_iface->soft_iface = NULL;
 527         batadv_hardif_free_ref(hard_iface);
 528
 529 out:
 530         if (primary_if)
 531                 batadv_hardif_free_ref(primary_if);
 532 }
 533
 534 /**
 535  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 536  * @work: work queue item
 537  *
 538  * Free the parts of the hard interface which can not be removed under
 539  * rtnl lock (to prevent deadlock situations).
 540  */
 541 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 542 {
 543         struct batadv_hard_iface *hard_iface;
 544
 545         hard_iface = container_of(work, struct batadv_hard_iface,
 546                                   cleanup_work);
 547
 548         batadv_debugfs_del_hardif(hard_iface);
 549         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 550         batadv_hardif_free_ref(hard_iface);
 551 }
 552
 553 static struct batadv_hard_iface *
 554 batadv_hardif_add_interface(struct net_device *net_dev)
 555 {
 556         struct batadv_hard_iface *hard_iface;
 557         int ret;
 558
 559         ASSERT_RTNL();
 560
 561         ret = batadv_is_valid_iface(net_dev);
 562         if (ret != 1)
 563                 goto out;
 564
 565         dev_hold(net_dev);
 566
 567         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 568         if (!hard_iface)
 569                 goto release_dev;
 570
 571         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 572         if (ret)
 573                 goto free_if;
 574
 575         hard_iface->if_num = -1;
 576         hard_iface->net_dev = net_dev;
 577         hard_iface->soft_iface = NULL;
 578         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 579
 580         ret = batadv_debugfs_add_hardif(hard_iface);
 581         if (ret)
 582                 goto free_sysfs;
 583
 584         INIT_LIST_HEAD(&hard_iface->list);
 585         INIT_WORK(&hard_iface->cleanup_work,
 586                   batadv_hardif_remove_interface_finish);
 587
 588         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 589         if (batadv_is_wifi_netdev(net_dev))
 590                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 591
 592         /* extra reference for return */
 593         atomic_set(&hard_iface->refcount, 2);
 594
 595         batadv_check_known_mac_addr(hard_iface->net_dev);
 596         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 597
 598         return hard_iface;
 599
 600 free_sysfs:
 601         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 602 free_if:
 603         kfree(hard_iface);
 604 release_dev:
 605         dev_put(net_dev);
 606 out:
 607         return NULL;
 608 }
 609
 610 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 611 {
 612         ASSERT_RTNL();
 613
 614         /* first deactivate interface */
 615         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 616                 batadv_hardif_disable_interface(hard_iface,
 617                                                 BATADV_IF_CLEANUP_AUTO);
 618
 619         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 620                 return;
 621
 622         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 623         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 624 }
 625
 626 void batadv_hardif_remove_interfaces(void)
 627 {
 628         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 629
 630         rtnl_lock();
 631         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 632                                  &batadv_hardif_list, list) {
 633                 list_del_rcu(&hard_iface->list);
 634                 batadv_hardif_remove_interface(hard_iface);
 635         }
 636         rtnl_unlock();
 637 }
 638
 639 static int batadv_hard_if_event(struct notifier_block *this,
 640                                 unsigned long event, void *ptr)
 641 {
 642         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 643         struct batadv_hard_iface *hard_iface;
 644         struct batadv_hard_iface *primary_if = NULL;
 645         struct batadv_priv *bat_priv;
 646
 647         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 648                 batadv_sysfs_add_meshif(net_dev);
 649                 bat_priv = netdev_priv(net_dev);
 650                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 651                 return NOTIFY_DONE;
 652         }
 653
 654         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 655         if (!hard_iface && event == NETDEV_REGISTER)
 656                 hard_iface = batadv_hardif_add_interface(net_dev);
 657
 658         if (!hard_iface)
 659                 goto out;
 660
 661         switch (event) {
 662         case NETDEV_UP:
 663                 batadv_hardif_activate_interface(hard_iface);
 664                 break;
 665         case NETDEV_GOING_DOWN:
 666         case NETDEV_DOWN:
 667                 batadv_hardif_deactivate_interface(hard_iface);
 668                 break;
 669         case NETDEV_UNREGISTER:
 670                 list_del_rcu(&hard_iface->list);
 671
 672                 batadv_hardif_remove_interface(hard_iface);
 673                 break;
 674         case NETDEV_CHANGEMTU:
 675                 if (hard_iface->soft_iface)
 676                         batadv_update_min_mtu(hard_iface->soft_iface);
 677                 break;
 678         case NETDEV_CHANGEADDR:
 679                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 680                         goto hardif_put;
 681
 682                 batadv_check_known_mac_addr(hard_iface->net_dev);
 683
 684                 bat_priv = netdev_priv(hard_iface->soft_iface);
 685                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 686
 687                 primary_if = batadv_primary_if_get_selected(bat_priv);
 688                 if (!primary_if)
 689                         goto hardif_put;
 690
 691                 if (hard_iface == primary_if)
 692                         batadv_primary_if_update_addr(bat_priv, NULL);
 693                 break;
 694         default:
 695                 break;
 696         }
 697
 698 hardif_put:
 699         batadv_hardif_free_ref(hard_iface);
 700 out:
 701         if (primary_if)
 702                 batadv_hardif_free_ref(primary_if);
 703         return NOTIFY_DONE;
 704 }
 705
 706 struct notifier_block batadv_hard_if_notifier = {
 707         .notifier_call = batadv_hard_if_event,
 708 };