net/batman-adv/hard-interface.c

   1 /* Copyright (C) 2007-2015 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 "hard-interface.h"
  19 #include "main.h"
  20
  21 #include <linux/bug.h>
  22 #include <linux/byteorder/generic.h>
  23 #include <linux/errno.h>
  24 #include <linux/fs.h>
  25 #include <linux/if_arp.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/printk.h>
  32 #include <linux/rculist.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/slab.h>
  35 #include <linux/workqueue.h>
  36 #include <net/net_namespace.h>
  37
  38 #include "bridge_loop_avoidance.h"
  39 #include "debugfs.h"
  40 #include "distributed-arp-table.h"
  41 #include "gateway_client.h"
  42 #include "originator.h"
  43 #include "packet.h"
  44 #include "send.h"
  45 #include "soft-interface.h"
  46 #include "sysfs.h"
  47 #include "translation-table.h"
  48
  49 void batadv_hardif_free_rcu(struct rcu_head *rcu)
  50 {
  51         struct batadv_hard_iface *hard_iface;
  52
  53         hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
  54         dev_put(hard_iface->net_dev);
  55         kfree(hard_iface);
  56 }
  57
  58 struct batadv_hard_iface *
  59 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
  60 {
  61         struct batadv_hard_iface *hard_iface;
  62
  63         rcu_read_lock();
  64         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
  65                 if (hard_iface->net_dev == net_dev &&
  66                     atomic_inc_not_zero(&hard_iface->refcount))
  67                         goto out;
  68         }
  69
  70         hard_iface = NULL;
  71
  72 out:
  73         rcu_read_unlock();
  74         return hard_iface;
  75 }
  76
  77 /**
  78  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
  79  * @net_dev: the device to check
  80  *
  81  * If the user creates any virtual device on top of a batman-adv interface, it
  82  * is important to prevent this new interface to be used to create a new mesh
  83  * network (this behaviour would lead to a batman-over-batman configuration).
  84  * This function recursively checks all the fathers of the device passed as
  85  * argument looking for a batman-adv soft interface.
  86  *
  87  * Returns true if the device is descendant of a batman-adv mesh interface (or
  88  * if it is a batman-adv interface itself), false otherwise
  89  */
  90 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
  91 {
  92         struct net_device *parent_dev;
  93         bool ret;
  94
  95         /* check if this is a batman-adv mesh interface */
  96         if (batadv_softif_is_valid(net_dev))
  97                 return true;
  98
  99         /* no more parents..stop recursion */
 100         if (dev_get_iflink(net_dev) == 0 ||
 101             dev_get_iflink(net_dev) == net_dev->ifindex)
 102                 return false;
 103
 104         /* recurse over the parent device */
 105         parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev));
 106         /* if we got a NULL parent_dev there is something broken.. */
 107         if (WARN(!parent_dev, "Cannot find parent device"))
 108                 return false;
 109
 110         ret = batadv_is_on_batman_iface(parent_dev);
 111
 112         return ret;
 113 }
 114
 115 static int batadv_is_valid_iface(const struct net_device *net_dev)
 116 {
 117         if (net_dev->flags & IFF_LOOPBACK)
 118                 return 0;
 119
 120         if (net_dev->type != ARPHRD_ETHER)
 121                 return 0;
 122
 123         if (net_dev->addr_len != ETH_ALEN)
 124                 return 0;
 125
 126         /* no batman over batman */
 127         if (batadv_is_on_batman_iface(net_dev))
 128                 return 0;
 129
 130         return 1;
 131 }
 132
 133 /**
 134  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 135  *  interface
 136  * @net_device: the device to check
 137  *
 138  * Returns true if the net device is a 802.11 wireless device, false otherwise.
 139  */
 140 bool batadv_is_wifi_netdev(struct net_device *net_device)
 141 {
 142         if (!net_device)
 143                 return false;
 144
 145 #ifdef CONFIG_WIRELESS_EXT
 146         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 147          * check for wireless_handlers != NULL
 148          */
 149         if (net_device->wireless_handlers)
 150                 return true;
 151 #endif
 152
 153         /* cfg80211 drivers have to set ieee80211_ptr */
 154         if (net_device->ieee80211_ptr)
 155                 return true;
 156
 157         return false;
 158 }
 159
 160 static struct batadv_hard_iface *
 161 batadv_hardif_get_active(const struct net_device *soft_iface)
 162 {
 163         struct batadv_hard_iface *hard_iface;
 164
 165         rcu_read_lock();
 166         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 167                 if (hard_iface->soft_iface != soft_iface)
 168                         continue;
 169
 170                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 171                     atomic_inc_not_zero(&hard_iface->refcount))
 172                         goto out;
 173         }
 174
 175         hard_iface = NULL;
 176
 177 out:
 178         rcu_read_unlock();
 179         return hard_iface;
 180 }
 181
 182 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 183                                           struct batadv_hard_iface *oldif)
 184 {
 185         struct batadv_hard_iface *primary_if;
 186
 187         primary_if = batadv_primary_if_get_selected(bat_priv);
 188         if (!primary_if)
 189                 goto out;
 190
 191         batadv_dat_init_own_addr(bat_priv, primary_if);
 192         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 193 out:
 194         if (primary_if)
 195                 batadv_hardif_free_ref(primary_if);
 196 }
 197
 198 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 199                                      struct batadv_hard_iface *new_hard_iface)
 200 {
 201         struct batadv_hard_iface *curr_hard_iface;
 202
 203         ASSERT_RTNL();
 204
 205         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 206                 new_hard_iface = NULL;
 207
 208         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 209         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 210
 211         if (!new_hard_iface)
 212                 goto out;
 213
 214         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 215         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 216
 217 out:
 218         if (curr_hard_iface)
 219                 batadv_hardif_free_ref(curr_hard_iface);
 220 }
 221
 222 static bool
 223 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 224 {
 225         if (hard_iface->net_dev->flags & IFF_UP)
 226                 return true;
 227
 228         return false;
 229 }
 230
 231 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 232 {
 233         const struct batadv_hard_iface *hard_iface;
 234
 235         rcu_read_lock();
 236         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 237                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 238                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 239                         continue;
 240
 241                 if (hard_iface->net_dev == net_dev)
 242                         continue;
 243
 244                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 245                                         net_dev->dev_addr))
 246                         continue;
 247
 248                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 249                         net_dev->dev_addr, hard_iface->net_dev->name);
 250                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 251         }
 252         rcu_read_unlock();
 253 }
 254
 255 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 256 {
 257         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 258         const struct batadv_hard_iface *hard_iface;
 259         int min_mtu = INT_MAX;
 260
 261         rcu_read_lock();
 262         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 263                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 264                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 265                         continue;
 266
 267                 if (hard_iface->soft_iface != soft_iface)
 268                         continue;
 269
 270                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 271         }
 272         rcu_read_unlock();
 273
 274         if (atomic_read(&bat_priv->fragmentation) == 0)
 275                 goto out;
 276
 277         /* with fragmentation enabled the maximum size of internally generated
 278          * packets such as translation table exchanges or tvlv containers, etc
 279          * has to be calculated
 280          */
 281         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 282         min_mtu -= sizeof(struct batadv_frag_packet);
 283         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 284
 285 out:
 286         /* report to the other components the maximum amount of bytes that
 287          * batman-adv can send over the wire (without considering the payload
 288          * overhead). For example, this value is used by TT to compute the
 289          * maximum local table table size
 290          */
 291         atomic_set(&bat_priv->packet_size_max, min_mtu);
 292
 293         /* the real soft-interface MTU is computed by removing the payload
 294          * overhead from the maximum amount of bytes that was just computed.
 295          *
 296          * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
 297          */
 298         return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
 299 }
 300
 301 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 302 void batadv_update_min_mtu(struct net_device *soft_iface)
 303 {
 304         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 305
 306         /* Check if the local translate table should be cleaned up to match a
 307          * new (and smaller) MTU.
 308          */
 309         batadv_tt_local_resize_to_mtu(soft_iface);
 310 }
 311
 312 static void
 313 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 314 {
 315         struct batadv_priv *bat_priv;
 316         struct batadv_hard_iface *primary_if = NULL;
 317
 318         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 319                 goto out;
 320
 321         bat_priv = netdev_priv(hard_iface->soft_iface);
 322
 323         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 324         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 325
 326         /* the first active interface becomes our primary interface or
 327          * the next active interface after the old primary interface was removed
 328          */
 329         primary_if = batadv_primary_if_get_selected(bat_priv);
 330         if (!primary_if)
 331                 batadv_primary_if_select(bat_priv, hard_iface);
 332
 333         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 334                     hard_iface->net_dev->name);
 335
 336         batadv_update_min_mtu(hard_iface->soft_iface);
 337
 338 out:
 339         if (primary_if)
 340                 batadv_hardif_free_ref(primary_if);
 341 }
 342
 343 static void
 344 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 345 {
 346         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 347             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 348                 return;
 349
 350         hard_iface->if_status = BATADV_IF_INACTIVE;
 351
 352         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 353                     hard_iface->net_dev->name);
 354
 355         batadv_update_min_mtu(hard_iface->soft_iface);
 356 }
 357
 358 /**
 359  * batadv_master_del_slave - remove hard_iface from the current master interface
 360  * @slave: the interface enslaved in another master
 361  * @master: the master from which slave has to be removed
 362  *
 363  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 364  * is free'd and master can correctly change its internal state.
 365  * Return 0 on success, a negative value representing the error otherwise
 366  */
 367 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 368                                    struct net_device *master)
 369 {
 370         int ret;
 371
 372         if (!master)
 373                 return 0;
 374
 375         ret = -EBUSY;
 376         if (master->netdev_ops->ndo_del_slave)
 377                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 378
 379         return ret;
 380 }
 381
 382 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 383                                    const char *iface_name)
 384 {
 385         struct batadv_priv *bat_priv;
 386         struct net_device *soft_iface, *master;
 387         __be16 ethertype = htons(ETH_P_BATMAN);
 388         int max_header_len = batadv_max_header_len();
 389         int ret;
 390
 391         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 392                 goto out;
 393
 394         if (!atomic_inc_not_zero(&hard_iface->refcount))
 395                 goto out;
 396
 397         soft_iface = dev_get_by_name(&init_net, iface_name);
 398
 399         if (!soft_iface) {
 400                 soft_iface = batadv_softif_create(iface_name);
 401
 402                 if (!soft_iface) {
 403                         ret = -ENOMEM;
 404                         goto err;
 405                 }
 406
 407                 /* dev_get_by_name() increases the reference counter for us */
 408                 dev_hold(soft_iface);
 409         }
 410
 411         if (!batadv_softif_is_valid(soft_iface)) {
 412                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 413                        soft_iface->name);
 414                 ret = -EINVAL;
 415                 goto err_dev;
 416         }
 417
 418         /* check if the interface is enslaved in another virtual one and
 419          * in that case unlink it first
 420          */
 421         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 422         ret = batadv_master_del_slave(hard_iface, master);
 423         if (ret)
 424                 goto err_dev;
 425
 426         hard_iface->soft_iface = soft_iface;
 427         bat_priv = netdev_priv(hard_iface->soft_iface);
 428
 429         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 430         if (ret)
 431                 goto err_dev;
 432
 433         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 434         if (ret < 0)
 435                 goto err_upper;
 436
 437         hard_iface->if_num = bat_priv->num_ifaces;
 438         bat_priv->num_ifaces++;
 439         hard_iface->if_status = BATADV_IF_INACTIVE;
 440         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 441         if (ret < 0) {
 442                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 443                 bat_priv->num_ifaces--;
 444                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 445                 goto err_upper;
 446         }
 447
 448         hard_iface->batman_adv_ptype.type = ethertype;
 449         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 450         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 451         dev_add_pack(&hard_iface->batman_adv_ptype);
 452
 453         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 454                     hard_iface->net_dev->name);
 455
 456         if (atomic_read(&bat_priv->fragmentation) &&
 457             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 458                 batadv_info(hard_iface->soft_iface,
 459                             "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",
 460                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 461                             ETH_DATA_LEN + max_header_len);
 462
 463         if (!atomic_read(&bat_priv->fragmentation) &&
 464             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 465                 batadv_info(hard_iface->soft_iface,
 466                             "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",
 467                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 468                             ETH_DATA_LEN + max_header_len);
 469
 470         if (batadv_hardif_is_iface_up(hard_iface))
 471                 batadv_hardif_activate_interface(hard_iface);
 472         else
 473                 batadv_err(hard_iface->soft_iface,
 474                            "Not using interface %s (retrying later): interface not active\n",
 475                            hard_iface->net_dev->name);
 476
 477         /* begin scheduling originator messages on that interface */
 478         batadv_schedule_bat_ogm(hard_iface);
 479
 480 out:
 481         return 0;
 482
 483 err_upper:
 484         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 485 err_dev:
 486         hard_iface->soft_iface = NULL;
 487         dev_put(soft_iface);
 488 err:
 489         batadv_hardif_free_ref(hard_iface);
 490         return ret;
 491 }
 492
 493 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 494                                      enum batadv_hard_if_cleanup autodel)
 495 {
 496         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 497         struct batadv_hard_iface *primary_if = NULL;
 498
 499         if (hard_iface->if_status == BATADV_IF_ACTIVE)
 500                 batadv_hardif_deactivate_interface(hard_iface);
 501
 502         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 503                 goto out;
 504
 505         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 506                     hard_iface->net_dev->name);
 507         dev_remove_pack(&hard_iface->batman_adv_ptype);
 508
 509         bat_priv->num_ifaces--;
 510         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 511
 512         primary_if = batadv_primary_if_get_selected(bat_priv);
 513         if (hard_iface == primary_if) {
 514                 struct batadv_hard_iface *new_if;
 515
 516                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 517                 batadv_primary_if_select(bat_priv, new_if);
 518
 519                 if (new_if)
 520                         batadv_hardif_free_ref(new_if);
 521         }
 522
 523         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 524         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 525
 526         /* delete all references to this hard_iface */
 527         batadv_purge_orig_ref(bat_priv);
 528         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 529         dev_put(hard_iface->soft_iface);
 530
 531         /* nobody uses this interface anymore */
 532         if (!bat_priv->num_ifaces) {
 533                 batadv_gw_check_client_stop(bat_priv);
 534
 535                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 536                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 537         }
 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_debugfs_del_hardif(hard_iface);
 563         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 564         batadv_hardif_free_ref(hard_iface);
 565 }
 566
 567 static struct batadv_hard_iface *
 568 batadv_hardif_add_interface(struct net_device *net_dev)
 569 {
 570         struct batadv_hard_iface *hard_iface;
 571         int ret;
 572
 573         ASSERT_RTNL();
 574
 575         ret = batadv_is_valid_iface(net_dev);
 576         if (ret != 1)
 577                 goto out;
 578
 579         dev_hold(net_dev);
 580
 581         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 582         if (!hard_iface)
 583                 goto release_dev;
 584
 585         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 586         if (ret)
 587                 goto free_if;
 588
 589         hard_iface->if_num = -1;
 590         hard_iface->net_dev = net_dev;
 591         hard_iface->soft_iface = NULL;
 592         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 593
 594         ret = batadv_debugfs_add_hardif(hard_iface);
 595         if (ret)
 596                 goto free_sysfs;
 597
 598         INIT_LIST_HEAD(&hard_iface->list);
 599         INIT_WORK(&hard_iface->cleanup_work,
 600                   batadv_hardif_remove_interface_finish);
 601
 602         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 603         if (batadv_is_wifi_netdev(net_dev))
 604                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 605
 606         /* extra reference for return */
 607         atomic_set(&hard_iface->refcount, 2);
 608
 609         batadv_check_known_mac_addr(hard_iface->net_dev);
 610         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 611
 612         return hard_iface;
 613
 614 free_sysfs:
 615         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 616 free_if:
 617         kfree(hard_iface);
 618 release_dev:
 619         dev_put(net_dev);
 620 out:
 621         return NULL;
 622 }
 623
 624 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 625 {
 626         ASSERT_RTNL();
 627
 628         /* first deactivate interface */
 629         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 630                 batadv_hardif_disable_interface(hard_iface,
 631                                                 BATADV_IF_CLEANUP_AUTO);
 632
 633         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 634                 return;
 635
 636         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 637         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 638 }
 639
 640 void batadv_hardif_remove_interfaces(void)
 641 {
 642         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 643
 644         rtnl_lock();
 645         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 646                                  &batadv_hardif_list, list) {
 647                 list_del_rcu(&hard_iface->list);
 648                 batadv_hardif_remove_interface(hard_iface);
 649         }
 650         rtnl_unlock();
 651 }
 652
 653 static int batadv_hard_if_event(struct notifier_block *this,
 654                                 unsigned long event, void *ptr)
 655 {
 656         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 657         struct batadv_hard_iface *hard_iface;
 658         struct batadv_hard_iface *primary_if = NULL;
 659         struct batadv_priv *bat_priv;
 660
 661         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 662                 batadv_sysfs_add_meshif(net_dev);
 663                 bat_priv = netdev_priv(net_dev);
 664                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 665                 return NOTIFY_DONE;
 666         }
 667
 668         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 669         if (!hard_iface && event == NETDEV_REGISTER)
 670                 hard_iface = batadv_hardif_add_interface(net_dev);
 671
 672         if (!hard_iface)
 673                 goto out;
 674
 675         switch (event) {
 676         case NETDEV_UP:
 677                 batadv_hardif_activate_interface(hard_iface);
 678                 break;
 679         case NETDEV_GOING_DOWN:
 680         case NETDEV_DOWN:
 681                 batadv_hardif_deactivate_interface(hard_iface);
 682                 break;
 683         case NETDEV_UNREGISTER:
 684                 list_del_rcu(&hard_iface->list);
 685
 686                 batadv_hardif_remove_interface(hard_iface);
 687                 break;
 688         case NETDEV_CHANGEMTU:
 689                 if (hard_iface->soft_iface)
 690                         batadv_update_min_mtu(hard_iface->soft_iface);
 691                 break;
 692         case NETDEV_CHANGEADDR:
 693                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 694                         goto hardif_put;
 695
 696                 batadv_check_known_mac_addr(hard_iface->net_dev);
 697
 698                 bat_priv = netdev_priv(hard_iface->soft_iface);
 699                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 700
 701                 primary_if = batadv_primary_if_get_selected(bat_priv);
 702                 if (!primary_if)
 703                         goto hardif_put;
 704
 705                 if (hard_iface == primary_if)
 706                         batadv_primary_if_update_addr(bat_priv, NULL);
 707                 break;
 708         default:
 709                 break;
 710         }
 711
 712 hardif_put:
 713         batadv_hardif_free_ref(hard_iface);
 714 out:
 715         if (primary_if)
 716                 batadv_hardif_free_ref(primary_if);
 717         return NOTIFY_DONE;
 718 }
 719
 720 struct notifier_block batadv_hard_if_notifier = {
 721         .notifier_call = batadv_hard_if_event,
 722 };