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_vis_packet *vis_packet;
 198         struct batadv_hard_iface *primary_if;
 199         struct sk_buff *skb;
 200
 201         primary_if = batadv_primary_if_get_selected(bat_priv);
 202         if (!primary_if)
 203                 goto out;
 204
 205         batadv_dat_init_own_addr(bat_priv, primary_if);
 206
 207         skb = bat_priv->vis.my_info->skb_packet;
 208         vis_packet = (struct batadv_vis_packet *)skb->data;
 209         memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
 210         memcpy(vis_packet->sender_orig,
 211                primary_if->net_dev->dev_addr, ETH_ALEN);
 212
 213         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 214 out:
 215         if (primary_if)
 216                 batadv_hardif_free_ref(primary_if);
 217 }
 218
 219 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 220                                      struct batadv_hard_iface *new_hard_iface)
 221 {
 222         struct batadv_hard_iface *curr_hard_iface;
 223
 224         ASSERT_RTNL();
 225
 226         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 227                 new_hard_iface = NULL;
 228
 229         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 230         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 231
 232         if (!new_hard_iface)
 233                 goto out;
 234
 235         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 236         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 237
 238 out:
 239         if (curr_hard_iface)
 240                 batadv_hardif_free_ref(curr_hard_iface);
 241 }
 242
 243 static bool
 244 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 245 {
 246         if (hard_iface->net_dev->flags & IFF_UP)
 247                 return true;
 248
 249         return false;
 250 }
 251
 252 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 253 {
 254         const struct batadv_hard_iface *hard_iface;
 255
 256         rcu_read_lock();
 257         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 258                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 259                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 260                         continue;
 261
 262                 if (hard_iface->net_dev == net_dev)
 263                         continue;
 264
 265                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 266                                         net_dev->dev_addr))
 267                         continue;
 268
 269                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 270                         net_dev->dev_addr, hard_iface->net_dev->name);
 271                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 272         }
 273         rcu_read_unlock();
 274 }
 275
 276 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 277 {
 278         const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 279         const struct batadv_hard_iface *hard_iface;
 280         /* allow big frames if all devices are capable to do so
 281          * (have MTU > 1500 + BAT_HEADER_LEN)
 282          */
 283         int min_mtu = ETH_DATA_LEN;
 284
 285         if (atomic_read(&bat_priv->fragmentation))
 286                 goto out;
 287
 288         rcu_read_lock();
 289         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 290                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 291                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 292                         continue;
 293
 294                 if (hard_iface->soft_iface != soft_iface)
 295                         continue;
 296
 297                 min_mtu = min_t(int,
 298                                 hard_iface->net_dev->mtu - BATADV_HEADER_LEN,
 299                                 min_mtu);
 300         }
 301         rcu_read_unlock();
 302 out:
 303         return min_mtu;
 304 }
 305
 306 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 307 void batadv_update_min_mtu(struct net_device *soft_iface)
 308 {
 309         int min_mtu;
 310
 311         min_mtu = batadv_hardif_min_mtu(soft_iface);
 312         if (soft_iface->mtu != min_mtu)
 313                 soft_iface->mtu = min_mtu;
 314 }
 315
 316 static void
 317 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 318 {
 319         struct batadv_priv *bat_priv;
 320         struct batadv_hard_iface *primary_if = NULL;
 321
 322         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 323                 goto out;
 324
 325         bat_priv = netdev_priv(hard_iface->soft_iface);
 326
 327         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 328         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 329
 330         /* the first active interface becomes our primary interface or
 331          * the next active interface after the old primary interface was removed
 332          */
 333         primary_if = batadv_primary_if_get_selected(bat_priv);
 334         if (!primary_if)
 335                 batadv_primary_if_select(bat_priv, hard_iface);
 336
 337         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 338                     hard_iface->net_dev->name);
 339
 340         batadv_update_min_mtu(hard_iface->soft_iface);
 341
 342 out:
 343         if (primary_if)
 344                 batadv_hardif_free_ref(primary_if);
 345 }
 346
 347 static void
 348 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 349 {
 350         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 351             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 352                 return;
 353
 354         hard_iface->if_status = BATADV_IF_INACTIVE;
 355
 356         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 357                     hard_iface->net_dev->name);
 358
 359         batadv_update_min_mtu(hard_iface->soft_iface);
 360 }
 361
 362 /**
 363  * batadv_master_del_slave - remove hard_iface from the current master interface
 364  * @slave: the interface enslaved in another master
 365  * @master: the master from which slave has to be removed
 366  *
 367  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 368  * is free'd and master can correctly change its internal state.
 369  * Return 0 on success, a negative value representing the error otherwise
 370  */
 371 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 372                                    struct net_device *master)
 373 {
 374         int ret;
 375
 376         if (!master)
 377                 return 0;
 378
 379         ret = -EBUSY;
 380         if (master->netdev_ops->ndo_del_slave)
 381                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 382
 383         return ret;
 384 }
 385
 386 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 387                                    const char *iface_name)
 388 {
 389         struct batadv_priv *bat_priv;
 390         struct net_device *soft_iface, *master;
 391         __be16 ethertype = __constant_htons(ETH_P_BATMAN);
 392         int ret;
 393
 394         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 395                 goto out;
 396
 397         if (!atomic_inc_not_zero(&hard_iface->refcount))
 398                 goto out;
 399
 400         soft_iface = dev_get_by_name(&init_net, iface_name);
 401
 402         if (!soft_iface) {
 403                 soft_iface = batadv_softif_create(iface_name);
 404
 405                 if (!soft_iface) {
 406                         ret = -ENOMEM;
 407                         goto err;
 408                 }
 409
 410                 /* dev_get_by_name() increases the reference counter for us */
 411                 dev_hold(soft_iface);
 412         }
 413
 414         if (!batadv_softif_is_valid(soft_iface)) {
 415                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 416                        soft_iface->name);
 417                 ret = -EINVAL;
 418                 goto err_dev;
 419         }
 420
 421         /* check if the interface is enslaved in another virtual one and
 422          * in that case unlink it first
 423          */
 424         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 425         ret = batadv_master_del_slave(hard_iface, master);
 426         if (ret)
 427                 goto err_dev;
 428
 429         hard_iface->soft_iface = soft_iface;
 430         bat_priv = netdev_priv(hard_iface->soft_iface);
 431
 432         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 433         if (ret)
 434                 goto err_dev;
 435
 436         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 437         if (ret < 0)
 438                 goto err_upper;
 439
 440         hard_iface->if_num = bat_priv->num_ifaces;
 441         bat_priv->num_ifaces++;
 442         hard_iface->if_status = BATADV_IF_INACTIVE;
 443         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 444         if (ret < 0) {
 445                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 446                 bat_priv->num_ifaces--;
 447                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 448                 goto err_upper;
 449         }
 450
 451         hard_iface->batman_adv_ptype.type = ethertype;
 452         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 453         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 454         dev_add_pack(&hard_iface->batman_adv_ptype);
 455
 456         atomic_set(&hard_iface->frag_seqno, 1);
 457         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 458                     hard_iface->net_dev->name);
 459
 460         if (atomic_read(&bat_priv->fragmentation) &&
 461             hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
 462                 batadv_info(hard_iface->soft_iface,
 463                             "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 %zi would solve the problem.\n",
 464                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 465                             ETH_DATA_LEN + BATADV_HEADER_LEN);
 466
 467         if (!atomic_read(&bat_priv->fragmentation) &&
 468             hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
 469                 batadv_info(hard_iface->soft_iface,
 470                             "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 %zi.\n",
 471                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 472                             ETH_DATA_LEN + BATADV_HEADER_LEN);
 473
 474         if (batadv_hardif_is_iface_up(hard_iface))
 475                 batadv_hardif_activate_interface(hard_iface);
 476         else
 477                 batadv_err(hard_iface->soft_iface,
 478                            "Not using interface %s (retrying later): interface not active\n",
 479                            hard_iface->net_dev->name);
 480
 481         /* begin scheduling originator messages on that interface */
 482         batadv_schedule_bat_ogm(hard_iface);
 483
 484 out:
 485         return 0;
 486
 487 err_upper:
 488         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 489 err_dev:
 490         hard_iface->soft_iface = NULL;
 491         dev_put(soft_iface);
 492 err:
 493         batadv_hardif_free_ref(hard_iface);
 494         return ret;
 495 }
 496
 497 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 498                                      enum batadv_hard_if_cleanup autodel)
 499 {
 500         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 501         struct batadv_hard_iface *primary_if = NULL;
 502
 503         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 504                 batadv_hardif_deactivate_interface(hard_iface);
 505
 506         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 507                 goto out;
 508
 509         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 510                     hard_iface->net_dev->name);
 511         dev_remove_pack(&hard_iface->batman_adv_ptype);
 512
 513         bat_priv->num_ifaces--;
 514         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 515
 516         primary_if = batadv_primary_if_get_selected(bat_priv);
 517         if (hard_iface == primary_if) {
 518                 struct batadv_hard_iface *new_if;
 519
 520                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 521                 batadv_primary_if_select(bat_priv, new_if);
 522
 523                 if (new_if)
 524                         batadv_hardif_free_ref(new_if);
 525         }
 526
 527         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 528         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 529
 530         /* delete all references to this hard_iface */
 531         batadv_purge_orig_ref(bat_priv);
 532         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 533         dev_put(hard_iface->soft_iface);
 534
 535         /* nobody uses this interface anymore */
 536         if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO)
 537                 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 538
 539         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 540         hard_iface->soft_iface = NULL;
 541         batadv_hardif_free_ref(hard_iface);
 542
 543 out:
 544         if (primary_if)
 545                 batadv_hardif_free_ref(primary_if);
 546 }
 547
 548 /**
 549  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 550  * @work: work queue item
 551  *
 552  * Free the parts of the hard interface which can not be removed under
 553  * rtnl lock (to prevent deadlock situations).
 554  */
 555 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 556 {
 557         struct batadv_hard_iface *hard_iface;
 558
 559         hard_iface = container_of(work, struct batadv_hard_iface,
 560                                   cleanup_work);
 561
 562         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 563         batadv_hardif_free_ref(hard_iface);
 564 }
 565
 566 static struct batadv_hard_iface *
 567 batadv_hardif_add_interface(struct net_device *net_dev)
 568 {
 569         struct batadv_hard_iface *hard_iface;
 570         int ret;
 571
 572         ASSERT_RTNL();
 573
 574         ret = batadv_is_valid_iface(net_dev);
 575         if (ret != 1)
 576                 goto out;
 577
 578         dev_hold(net_dev);
 579
 580         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 581         if (!hard_iface)
 582                 goto release_dev;
 583
 584         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 585         if (ret)
 586                 goto free_if;
 587
 588         hard_iface->if_num = -1;
 589         hard_iface->net_dev = net_dev;
 590         hard_iface->soft_iface = NULL;
 591         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 592         INIT_LIST_HEAD(&hard_iface->list);
 593         INIT_WORK(&hard_iface->cleanup_work,
 594                   batadv_hardif_remove_interface_finish);
 595
 596         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 597         if (batadv_is_wifi_netdev(net_dev))
 598                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 599
 600         /* extra reference for return */
 601         atomic_set(&hard_iface->refcount, 2);
 602
 603         batadv_check_known_mac_addr(hard_iface->net_dev);
 604         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 605
 606         return hard_iface;
 607
 608 free_if:
 609         kfree(hard_iface);
 610 release_dev:
 611         dev_put(net_dev);
 612 out:
 613         return NULL;
 614 }
 615
 616 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 617 {
 618         ASSERT_RTNL();
 619
 620         /* first deactivate interface */
 621         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 622                 batadv_hardif_disable_interface(hard_iface,
 623                                                 BATADV_IF_CLEANUP_AUTO);
 624
 625         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 626                 return;
 627
 628         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 629         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 630 }
 631
 632 void batadv_hardif_remove_interfaces(void)
 633 {
 634         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 635
 636         rtnl_lock();
 637         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 638                                  &batadv_hardif_list, list) {
 639                 list_del_rcu(&hard_iface->list);
 640                 batadv_hardif_remove_interface(hard_iface);
 641         }
 642         rtnl_unlock();
 643 }
 644
 645 static int batadv_hard_if_event(struct notifier_block *this,
 646                                 unsigned long event, void *ptr)
 647 {
 648         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 649         struct batadv_hard_iface *hard_iface;
 650         struct batadv_hard_iface *primary_if = NULL;
 651         struct batadv_priv *bat_priv;
 652
 653         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 654                 batadv_sysfs_add_meshif(net_dev);
 655                 return NOTIFY_DONE;
 656         }
 657
 658         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 659         if (!hard_iface && event == NETDEV_REGISTER)
 660                 hard_iface = batadv_hardif_add_interface(net_dev);
 661
 662         if (!hard_iface)
 663                 goto out;
 664
 665         switch (event) {
 666         case NETDEV_UP:
 667                 batadv_hardif_activate_interface(hard_iface);
 668                 break;
 669         case NETDEV_GOING_DOWN:
 670         case NETDEV_DOWN:
 671                 batadv_hardif_deactivate_interface(hard_iface);
 672                 break;
 673         case NETDEV_UNREGISTER:
 674                 list_del_rcu(&hard_iface->list);
 675
 676                 batadv_hardif_remove_interface(hard_iface);
 677                 break;
 678         case NETDEV_CHANGEMTU:
 679                 if (hard_iface->soft_iface)
 680                         batadv_update_min_mtu(hard_iface->soft_iface);
 681                 break;
 682         case NETDEV_CHANGEADDR:
 683                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 684                         goto hardif_put;
 685
 686                 batadv_check_known_mac_addr(hard_iface->net_dev);
 687
 688                 bat_priv = netdev_priv(hard_iface->soft_iface);
 689                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 690
 691                 primary_if = batadv_primary_if_get_selected(bat_priv);
 692                 if (!primary_if)
 693                         goto hardif_put;
 694
 695                 if (hard_iface == primary_if)
 696                         batadv_primary_if_update_addr(bat_priv, NULL);
 697                 break;
 698         default:
 699                 break;
 700         }
 701
 702 hardif_put:
 703         batadv_hardif_free_ref(hard_iface);
 704 out:
 705         if (primary_if)
 706                 batadv_hardif_free_ref(primary_if);
 707         return NOTIFY_DONE;
 708 }
 709
 710 struct notifier_block batadv_hard_if_notifier = {
 711         .notifier_call = batadv_hard_if_event,
 712 };