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         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 270         const struct batadv_hard_iface *hard_iface;
 271         int min_mtu = ETH_DATA_LEN;
 272
 273         rcu_read_lock();
 274         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 275                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 276                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 277                         continue;
 278
 279                 if (hard_iface->soft_iface != soft_iface)
 280                         continue;
 281
 282                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 283         }
 284         rcu_read_unlock();
 285
 286         atomic_set(&bat_priv->packet_size_max, min_mtu);
 287
 288         if (atomic_read(&bat_priv->fragmentation) == 0)
 289                 goto out;
 290
 291         /* with fragmentation enabled the maximum size of internally generated
 292          * packets such as translation table exchanges or tvlv containers, etc
 293          * has to be calculated
 294          */
 295         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 296         min_mtu -= sizeof(struct batadv_frag_packet);
 297         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 298         atomic_set(&bat_priv->packet_size_max, min_mtu);
 299
 300         /* with fragmentation enabled we can fragment external packets easily */
 301         min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
 302
 303 out:
 304         return min_mtu - batadv_max_header_len();
 305 }
 306
 307 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 308 void batadv_update_min_mtu(struct net_device *soft_iface)
 309 {
 310         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 311
 312         /* Check if the local translate table should be cleaned up to match a
 313          * new (and smaller) MTU.
 314          */
 315         batadv_tt_local_resize_to_mtu(soft_iface);
 316 }
 317
 318 static void
 319 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 320 {
 321         struct batadv_priv *bat_priv;
 322         struct batadv_hard_iface *primary_if = NULL;
 323
 324         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 325                 goto out;
 326
 327         bat_priv = netdev_priv(hard_iface->soft_iface);
 328
 329         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 330         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 331
 332         /* the first active interface becomes our primary interface or
 333          * the next active interface after the old primary interface was removed
 334          */
 335         primary_if = batadv_primary_if_get_selected(bat_priv);
 336         if (!primary_if)
 337                 batadv_primary_if_select(bat_priv, hard_iface);
 338
 339         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 340                     hard_iface->net_dev->name);
 341
 342         batadv_update_min_mtu(hard_iface->soft_iface);
 343
 344 out:
 345         if (primary_if)
 346                 batadv_hardif_free_ref(primary_if);
 347 }
 348
 349 static void
 350 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 351 {
 352         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 353             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 354                 return;
 355
 356         hard_iface->if_status = BATADV_IF_INACTIVE;
 357
 358         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 359                     hard_iface->net_dev->name);
 360
 361         batadv_update_min_mtu(hard_iface->soft_iface);
 362 }
 363
 364 /**
 365  * batadv_master_del_slave - remove hard_iface from the current master interface
 366  * @slave: the interface enslaved in another master
 367  * @master: the master from which slave has to be removed
 368  *
 369  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 370  * is free'd and master can correctly change its internal state.
 371  * Return 0 on success, a negative value representing the error otherwise
 372  */
 373 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 374                                    struct net_device *master)
 375 {
 376         int ret;
 377
 378         if (!master)
 379                 return 0;
 380
 381         ret = -EBUSY;
 382         if (master->netdev_ops->ndo_del_slave)
 383                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 384
 385         return ret;
 386 }
 387
 388 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 389                                    const char *iface_name)
 390 {
 391         struct batadv_priv *bat_priv;
 392         struct net_device *soft_iface, *master;
 393         __be16 ethertype = htons(ETH_P_BATMAN);
 394         int max_header_len = batadv_max_header_len();
 395         int ret;
 396
 397         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 398                 goto out;
 399
 400         if (!atomic_inc_not_zero(&hard_iface->refcount))
 401                 goto out;
 402
 403         soft_iface = dev_get_by_name(&init_net, iface_name);
 404
 405         if (!soft_iface) {
 406                 soft_iface = batadv_softif_create(iface_name);
 407
 408                 if (!soft_iface) {
 409                         ret = -ENOMEM;
 410                         goto err;
 411                 }
 412
 413                 /* dev_get_by_name() increases the reference counter for us */
 414                 dev_hold(soft_iface);
 415         }
 416
 417         if (!batadv_softif_is_valid(soft_iface)) {
 418                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 419                        soft_iface->name);
 420                 ret = -EINVAL;
 421                 goto err_dev;
 422         }
 423
 424         /* check if the interface is enslaved in another virtual one and
 425          * in that case unlink it first
 426          */
 427         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 428         ret = batadv_master_del_slave(hard_iface, master);
 429         if (ret)
 430                 goto err_dev;
 431
 432         hard_iface->soft_iface = soft_iface;
 433         bat_priv = netdev_priv(hard_iface->soft_iface);
 434
 435         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 436         if (ret)
 437                 goto err_dev;
 438
 439         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 440         if (ret < 0)
 441                 goto err_upper;
 442
 443         hard_iface->if_num = bat_priv->num_ifaces;
 444         bat_priv->num_ifaces++;
 445         hard_iface->if_status = BATADV_IF_INACTIVE;
 446         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 447         if (ret < 0) {
 448                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 449                 bat_priv->num_ifaces--;
 450                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 451                 goto err_upper;
 452         }
 453
 454         hard_iface->batman_adv_ptype.type = ethertype;
 455         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 456         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 457         dev_add_pack(&hard_iface->batman_adv_ptype);
 458
 459         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 460                     hard_iface->net_dev->name);
 461
 462         if (atomic_read(&bat_priv->fragmentation) &&
 463             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 464                 batadv_info(hard_iface->soft_iface,
 465                             "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",
 466                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 467                             ETH_DATA_LEN + max_header_len);
 468
 469         if (!atomic_read(&bat_priv->fragmentation) &&
 470             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 471                 batadv_info(hard_iface->soft_iface,
 472                             "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",
 473                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 474                             ETH_DATA_LEN + max_header_len);
 475
 476         if (batadv_hardif_is_iface_up(hard_iface))
 477                 batadv_hardif_activate_interface(hard_iface);
 478         else
 479                 batadv_err(hard_iface->soft_iface,
 480                            "Not using interface %s (retrying later): interface not active\n",
 481                            hard_iface->net_dev->name);
 482
 483         /* begin scheduling originator messages on that interface */
 484         batadv_schedule_bat_ogm(hard_iface);
 485
 486 out:
 487         return 0;
 488
 489 err_upper:
 490         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 491 err_dev:
 492         hard_iface->soft_iface = NULL;
 493         dev_put(soft_iface);
 494 err:
 495         batadv_hardif_free_ref(hard_iface);
 496         return ret;
 497 }
 498
 499 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 500                                      enum batadv_hard_if_cleanup autodel)
 501 {
 502         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 503         struct batadv_hard_iface *primary_if = NULL;
 504
 505         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 506                 batadv_hardif_deactivate_interface(hard_iface);
 507
 508         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 509                 goto out;
 510
 511         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 512                     hard_iface->net_dev->name);
 513         dev_remove_pack(&hard_iface->batman_adv_ptype);
 514
 515         bat_priv->num_ifaces--;
 516         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 517
 518         primary_if = batadv_primary_if_get_selected(bat_priv);
 519         if (hard_iface == primary_if) {
 520                 struct batadv_hard_iface *new_if;
 521
 522                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 523                 batadv_primary_if_select(bat_priv, new_if);
 524
 525                 if (new_if)
 526                         batadv_hardif_free_ref(new_if);
 527         }
 528
 529         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 530         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 531
 532         /* delete all references to this hard_iface */
 533         batadv_purge_orig_ref(bat_priv);
 534         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 535         dev_put(hard_iface->soft_iface);
 536
 537         /* nobody uses this interface anymore */
 538         if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO)
 539                 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 540
 541         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 542         hard_iface->soft_iface = NULL;
 543         batadv_hardif_free_ref(hard_iface);
 544
 545 out:
 546         if (primary_if)
 547                 batadv_hardif_free_ref(primary_if);
 548 }
 549
 550 /**
 551  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 552  * @work: work queue item
 553  *
 554  * Free the parts of the hard interface which can not be removed under
 555  * rtnl lock (to prevent deadlock situations).
 556  */
 557 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 558 {
 559         struct batadv_hard_iface *hard_iface;
 560
 561         hard_iface = container_of(work, struct batadv_hard_iface,
 562                                   cleanup_work);
 563
 564         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 565         batadv_hardif_free_ref(hard_iface);
 566 }
 567
 568 static struct batadv_hard_iface *
 569 batadv_hardif_add_interface(struct net_device *net_dev)
 570 {
 571         struct batadv_hard_iface *hard_iface;
 572         int ret;
 573
 574         ASSERT_RTNL();
 575
 576         ret = batadv_is_valid_iface(net_dev);
 577         if (ret != 1)
 578                 goto out;
 579
 580         dev_hold(net_dev);
 581
 582         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 583         if (!hard_iface)
 584                 goto release_dev;
 585
 586         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 587         if (ret)
 588                 goto free_if;
 589
 590         hard_iface->if_num = -1;
 591         hard_iface->net_dev = net_dev;
 592         hard_iface->soft_iface = NULL;
 593         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 594         INIT_LIST_HEAD(&hard_iface->list);
 595         INIT_WORK(&hard_iface->cleanup_work,
 596                   batadv_hardif_remove_interface_finish);
 597
 598         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 599         if (batadv_is_wifi_netdev(net_dev))
 600                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 601
 602         /* extra reference for return */
 603         atomic_set(&hard_iface->refcount, 2);
 604
 605         batadv_check_known_mac_addr(hard_iface->net_dev);
 606         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 607
 608         return hard_iface;
 609
 610 free_if:
 611         kfree(hard_iface);
 612 release_dev:
 613         dev_put(net_dev);
 614 out:
 615         return NULL;
 616 }
 617
 618 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 619 {
 620         ASSERT_RTNL();
 621
 622         /* first deactivate interface */
 623         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 624                 batadv_hardif_disable_interface(hard_iface,
 625                                                 BATADV_IF_CLEANUP_AUTO);
 626
 627         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 628                 return;
 629
 630         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 631         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 632 }
 633
 634 void batadv_hardif_remove_interfaces(void)
 635 {
 636         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 637
 638         rtnl_lock();
 639         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 640                                  &batadv_hardif_list, list) {
 641                 list_del_rcu(&hard_iface->list);
 642                 batadv_hardif_remove_interface(hard_iface);
 643         }
 644         rtnl_unlock();
 645 }
 646
 647 static int batadv_hard_if_event(struct notifier_block *this,
 648                                 unsigned long event, void *ptr)
 649 {
 650         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 651         struct batadv_hard_iface *hard_iface;
 652         struct batadv_hard_iface *primary_if = NULL;
 653         struct batadv_priv *bat_priv;
 654
 655         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 656                 batadv_sysfs_add_meshif(net_dev);
 657                 bat_priv = netdev_priv(net_dev);
 658                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 659                 return NOTIFY_DONE;
 660         }
 661
 662         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 663         if (!hard_iface && event == NETDEV_REGISTER)
 664                 hard_iface = batadv_hardif_add_interface(net_dev);
 665
 666         if (!hard_iface)
 667                 goto out;
 668
 669         switch (event) {
 670         case NETDEV_UP:
 671                 batadv_hardif_activate_interface(hard_iface);
 672                 break;
 673         case NETDEV_GOING_DOWN:
 674         case NETDEV_DOWN:
 675                 batadv_hardif_deactivate_interface(hard_iface);
 676                 break;
 677         case NETDEV_UNREGISTER:
 678                 list_del_rcu(&hard_iface->list);
 679
 680                 batadv_hardif_remove_interface(hard_iface);
 681                 break;
 682         case NETDEV_CHANGEMTU:
 683                 if (hard_iface->soft_iface)
 684                         batadv_update_min_mtu(hard_iface->soft_iface);
 685                 break;
 686         case NETDEV_CHANGEADDR:
 687                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 688                         goto hardif_put;
 689
 690                 batadv_check_known_mac_addr(hard_iface->net_dev);
 691
 692                 bat_priv = netdev_priv(hard_iface->soft_iface);
 693                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 694
 695                 primary_if = batadv_primary_if_get_selected(bat_priv);
 696                 if (!primary_if)
 697                         goto hardif_put;
 698
 699                 if (hard_iface == primary_if)
 700                         batadv_primary_if_update_addr(bat_priv, NULL);
 701                 break;
 702         default:
 703                 break;
 704         }
 705
 706 hardif_put:
 707         batadv_hardif_free_ref(hard_iface);
 708 out:
 709         if (primary_if)
 710                 batadv_hardif_free_ref(primary_if);
 711         return NOTIFY_DONE;
 712 }
 713
 714 struct notifier_block batadv_hard_if_notifier = {
 715         .notifier_call = batadv_hard_if_event,
 716 };