1 /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: 2 * 3 * Marek Lindner, Simon Wunderlich 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "main.h" 19 #include "distributed-arp-table.h" 20 #include "hard-interface.h" 21 #include "soft-interface.h" 22 #include "send.h" 23 #include "translation-table.h" 24 #include "routing.h" 25 #include "sysfs.h" 26 #include "debugfs.h" 27 #include "originator.h" 28 #include "hash.h" 29 #include "bridge_loop_avoidance.h" 30 #include "gateway_client.h" 31 32 #include <linux/if_arp.h> 33 #include <linux/if_ether.h> 34 35 void batadv_hardif_free_rcu(struct rcu_head *rcu) 36 { 37 struct batadv_hard_iface *hard_iface; 38 39 hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); 40 dev_put(hard_iface->net_dev); 41 kfree(hard_iface); 42 } 43 44 struct batadv_hard_iface * 45 batadv_hardif_get_by_netdev(const struct net_device *net_dev) 46 { 47 struct batadv_hard_iface *hard_iface; 48 49 rcu_read_lock(); 50 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 51 if (hard_iface->net_dev == net_dev && 52 atomic_inc_not_zero(&hard_iface->refcount)) 53 goto out; 54 } 55 56 hard_iface = NULL; 57 58 out: 59 rcu_read_unlock(); 60 return hard_iface; 61 } 62 63 /** 64 * batadv_is_on_batman_iface - check if a device is a batman iface descendant 65 * @net_dev: the device to check 66 * 67 * If the user creates any virtual device on top of a batman-adv interface, it 68 * is important to prevent this new interface to be used to create a new mesh 69 * network (this behaviour would lead to a batman-over-batman configuration). 70 * This function recursively checks all the fathers of the device passed as 71 * argument looking for a batman-adv soft interface. 72 * 73 * Returns true if the device is descendant of a batman-adv mesh interface (or 74 * if it is a batman-adv interface itself), false otherwise 75 */ 76 static bool batadv_is_on_batman_iface(const struct net_device *net_dev) 77 { 78 struct net_device *parent_dev; 79 bool ret; 80 81 /* check if this is a batman-adv mesh interface */ 82 if (batadv_softif_is_valid(net_dev)) 83 return true; 84 85 /* no more parents..stop recursion */ 86 if (net_dev->iflink == net_dev->ifindex) 87 return false; 88 89 /* recurse over the parent device */ 90 parent_dev = __dev_get_by_index(&init_net, net_dev->iflink); 91 /* if we got a NULL parent_dev there is something broken.. */ 92 if (WARN(!parent_dev, "Cannot find parent device")) 93 return false; 94 95 ret = batadv_is_on_batman_iface(parent_dev); 96 97 return ret; 98 } 99 100 static int batadv_is_valid_iface(const struct net_device *net_dev) 101 { 102 if (net_dev->flags & IFF_LOOPBACK) 103 return 0; 104 105 if (net_dev->type != ARPHRD_ETHER) 106 return 0; 107 108 if (net_dev->addr_len != ETH_ALEN) 109 return 0; 110 111 /* no batman over batman */ 112 if (batadv_is_on_batman_iface(net_dev)) 113 return 0; 114 115 return 1; 116 } 117 118 /** 119 * batadv_is_wifi_netdev - check if the given net_device struct is a wifi 120 * interface 121 * @net_device: the device to check 122 * 123 * Returns true if the net device is a 802.11 wireless device, false otherwise. 124 */ 125 bool batadv_is_wifi_netdev(struct net_device *net_device) 126 { 127 if (!net_device) 128 return false; 129 130 #ifdef CONFIG_WIRELESS_EXT 131 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to 132 * check for wireless_handlers != NULL 133 */ 134 if (net_device->wireless_handlers) 135 return true; 136 #endif 137 138 /* cfg80211 drivers have to set ieee80211_ptr */ 139 if (net_device->ieee80211_ptr) 140 return true; 141 142 return false; 143 } 144 145 static struct batadv_hard_iface * 146 batadv_hardif_get_active(const struct net_device *soft_iface) 147 { 148 struct batadv_hard_iface *hard_iface; 149 150 rcu_read_lock(); 151 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 152 if (hard_iface->soft_iface != soft_iface) 153 continue; 154 155 if (hard_iface->if_status == BATADV_IF_ACTIVE && 156 atomic_inc_not_zero(&hard_iface->refcount)) 157 goto out; 158 } 159 160 hard_iface = NULL; 161 162 out: 163 rcu_read_unlock(); 164 return hard_iface; 165 } 166 167 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, 168 struct batadv_hard_iface *oldif) 169 { 170 struct batadv_hard_iface *primary_if; 171 172 primary_if = batadv_primary_if_get_selected(bat_priv); 173 if (!primary_if) 174 goto out; 175 176 batadv_dat_init_own_addr(bat_priv, primary_if); 177 batadv_bla_update_orig_address(bat_priv, primary_if, oldif); 178 out: 179 if (primary_if) 180 batadv_hardif_free_ref(primary_if); 181 } 182 183 static void batadv_primary_if_select(struct batadv_priv *bat_priv, 184 struct batadv_hard_iface *new_hard_iface) 185 { 186 struct batadv_hard_iface *curr_hard_iface; 187 188 ASSERT_RTNL(); 189 190 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) 191 new_hard_iface = NULL; 192 193 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); 194 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); 195 196 if (!new_hard_iface) 197 goto out; 198 199 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); 200 batadv_primary_if_update_addr(bat_priv, curr_hard_iface); 201 202 out: 203 if (curr_hard_iface) 204 batadv_hardif_free_ref(curr_hard_iface); 205 } 206 207 static bool 208 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) 209 { 210 if (hard_iface->net_dev->flags & IFF_UP) 211 return true; 212 213 return false; 214 } 215 216 static void batadv_check_known_mac_addr(const struct net_device *net_dev) 217 { 218 const struct batadv_hard_iface *hard_iface; 219 220 rcu_read_lock(); 221 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 222 if ((hard_iface->if_status != BATADV_IF_ACTIVE) && 223 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) 224 continue; 225 226 if (hard_iface->net_dev == net_dev) 227 continue; 228 229 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, 230 net_dev->dev_addr)) 231 continue; 232 233 pr_warn("The newly added mac address (%pM) already exists on: %s\n", 234 net_dev->dev_addr, hard_iface->net_dev->name); 235 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); 236 } 237 rcu_read_unlock(); 238 } 239 240 int batadv_hardif_min_mtu(struct net_device *soft_iface) 241 { 242 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 243 const struct batadv_hard_iface *hard_iface; 244 int min_mtu = ETH_DATA_LEN; 245 246 rcu_read_lock(); 247 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 248 if ((hard_iface->if_status != BATADV_IF_ACTIVE) && 249 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) 250 continue; 251 252 if (hard_iface->soft_iface != soft_iface) 253 continue; 254 255 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); 256 } 257 rcu_read_unlock(); 258 259 atomic_set(&bat_priv->packet_size_max, min_mtu); 260 261 if (atomic_read(&bat_priv->fragmentation) == 0) 262 goto out; 263 264 /* with fragmentation enabled the maximum size of internally generated 265 * packets such as translation table exchanges or tvlv containers, etc 266 * has to be calculated 267 */ 268 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); 269 min_mtu -= sizeof(struct batadv_frag_packet); 270 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; 271 atomic_set(&bat_priv->packet_size_max, min_mtu); 272 273 /* with fragmentation enabled we can fragment external packets easily */ 274 min_mtu = min_t(int, min_mtu, ETH_DATA_LEN); 275 276 out: 277 return min_mtu - batadv_max_header_len(); 278 } 279 280 /* adjusts the MTU if a new interface with a smaller MTU appeared. */ 281 void batadv_update_min_mtu(struct net_device *soft_iface) 282 { 283 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); 284 285 /* Check if the local translate table should be cleaned up to match a 286 * new (and smaller) MTU. 287 */ 288 batadv_tt_local_resize_to_mtu(soft_iface); 289 } 290 291 static void 292 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) 293 { 294 struct batadv_priv *bat_priv; 295 struct batadv_hard_iface *primary_if = NULL; 296 297 if (hard_iface->if_status != BATADV_IF_INACTIVE) 298 goto out; 299 300 bat_priv = netdev_priv(hard_iface->soft_iface); 301 302 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); 303 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; 304 305 /* the first active interface becomes our primary interface or 306 * the next active interface after the old primary interface was removed 307 */ 308 primary_if = batadv_primary_if_get_selected(bat_priv); 309 if (!primary_if) 310 batadv_primary_if_select(bat_priv, hard_iface); 311 312 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", 313 hard_iface->net_dev->name); 314 315 batadv_update_min_mtu(hard_iface->soft_iface); 316 317 out: 318 if (primary_if) 319 batadv_hardif_free_ref(primary_if); 320 } 321 322 static void 323 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) 324 { 325 if ((hard_iface->if_status != BATADV_IF_ACTIVE) && 326 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) 327 return; 328 329 hard_iface->if_status = BATADV_IF_INACTIVE; 330 331 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", 332 hard_iface->net_dev->name); 333 334 batadv_update_min_mtu(hard_iface->soft_iface); 335 } 336 337 /** 338 * batadv_master_del_slave - remove hard_iface from the current master interface 339 * @slave: the interface enslaved in another master 340 * @master: the master from which slave has to be removed 341 * 342 * Invoke ndo_del_slave on master passing slave as argument. In this way slave 343 * is free'd and master can correctly change its internal state. 344 * Return 0 on success, a negative value representing the error otherwise 345 */ 346 static int batadv_master_del_slave(struct batadv_hard_iface *slave, 347 struct net_device *master) 348 { 349 int ret; 350 351 if (!master) 352 return 0; 353 354 ret = -EBUSY; 355 if (master->netdev_ops->ndo_del_slave) 356 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); 357 358 return ret; 359 } 360 361 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, 362 const char *iface_name) 363 { 364 struct batadv_priv *bat_priv; 365 struct net_device *soft_iface, *master; 366 __be16 ethertype = htons(ETH_P_BATMAN); 367 int max_header_len = batadv_max_header_len(); 368 int ret; 369 370 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) 371 goto out; 372 373 if (!atomic_inc_not_zero(&hard_iface->refcount)) 374 goto out; 375 376 soft_iface = dev_get_by_name(&init_net, iface_name); 377 378 if (!soft_iface) { 379 soft_iface = batadv_softif_create(iface_name); 380 381 if (!soft_iface) { 382 ret = -ENOMEM; 383 goto err; 384 } 385 386 /* dev_get_by_name() increases the reference counter for us */ 387 dev_hold(soft_iface); 388 } 389 390 if (!batadv_softif_is_valid(soft_iface)) { 391 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", 392 soft_iface->name); 393 ret = -EINVAL; 394 goto err_dev; 395 } 396 397 /* check if the interface is enslaved in another virtual one and 398 * in that case unlink it first 399 */ 400 master = netdev_master_upper_dev_get(hard_iface->net_dev); 401 ret = batadv_master_del_slave(hard_iface, master); 402 if (ret) 403 goto err_dev; 404 405 hard_iface->soft_iface = soft_iface; 406 bat_priv = netdev_priv(hard_iface->soft_iface); 407 408 ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); 409 if (ret) 410 goto err_dev; 411 412 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); 413 if (ret < 0) 414 goto err_upper; 415 416 hard_iface->if_num = bat_priv->num_ifaces; 417 bat_priv->num_ifaces++; 418 hard_iface->if_status = BATADV_IF_INACTIVE; 419 ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); 420 if (ret < 0) { 421 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); 422 bat_priv->num_ifaces--; 423 hard_iface->if_status = BATADV_IF_NOT_IN_USE; 424 goto err_upper; 425 } 426 427 hard_iface->batman_adv_ptype.type = ethertype; 428 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; 429 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; 430 dev_add_pack(&hard_iface->batman_adv_ptype); 431 432 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", 433 hard_iface->net_dev->name); 434 435 if (atomic_read(&bat_priv->fragmentation) && 436 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) 437 batadv_info(hard_iface->soft_iface, 438 "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", 439 hard_iface->net_dev->name, hard_iface->net_dev->mtu, 440 ETH_DATA_LEN + max_header_len); 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. If you experience problems getting traffic through try increasing the MTU to %i.\n", 446 hard_iface->net_dev->name, hard_iface->net_dev->mtu, 447 ETH_DATA_LEN + max_header_len); 448 449 if (batadv_hardif_is_iface_up(hard_iface)) 450 batadv_hardif_activate_interface(hard_iface); 451 else 452 batadv_err(hard_iface->soft_iface, 453 "Not using interface %s (retrying later): interface not active\n", 454 hard_iface->net_dev->name); 455 456 /* begin scheduling originator messages on that interface */ 457 batadv_schedule_bat_ogm(hard_iface); 458 459 out: 460 return 0; 461 462 err_upper: 463 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); 464 err_dev: 465 hard_iface->soft_iface = NULL; 466 dev_put(soft_iface); 467 err: 468 batadv_hardif_free_ref(hard_iface); 469 return ret; 470 } 471 472 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, 473 enum batadv_hard_if_cleanup autodel) 474 { 475 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 476 struct batadv_hard_iface *primary_if = NULL; 477 478 if (hard_iface->if_status == BATADV_IF_ACTIVE) 479 batadv_hardif_deactivate_interface(hard_iface); 480 481 if (hard_iface->if_status != BATADV_IF_INACTIVE) 482 goto out; 483 484 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", 485 hard_iface->net_dev->name); 486 dev_remove_pack(&hard_iface->batman_adv_ptype); 487 488 bat_priv->num_ifaces--; 489 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); 490 491 primary_if = batadv_primary_if_get_selected(bat_priv); 492 if (hard_iface == primary_if) { 493 struct batadv_hard_iface *new_if; 494 495 new_if = batadv_hardif_get_active(hard_iface->soft_iface); 496 batadv_primary_if_select(bat_priv, new_if); 497 498 if (new_if) 499 batadv_hardif_free_ref(new_if); 500 } 501 502 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); 503 hard_iface->if_status = BATADV_IF_NOT_IN_USE; 504 505 /* delete all references to this hard_iface */ 506 batadv_purge_orig_ref(bat_priv); 507 batadv_purge_outstanding_packets(bat_priv, hard_iface); 508 dev_put(hard_iface->soft_iface); 509 510 /* nobody uses this interface anymore */ 511 if (!bat_priv->num_ifaces) { 512 batadv_gw_check_client_stop(bat_priv); 513 514 if (autodel == BATADV_IF_CLEANUP_AUTO) 515 batadv_softif_destroy_sysfs(hard_iface->soft_iface); 516 } 517 518 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); 519 hard_iface->soft_iface = NULL; 520 batadv_hardif_free_ref(hard_iface); 521 522 out: 523 if (primary_if) 524 batadv_hardif_free_ref(primary_if); 525 } 526 527 /** 528 * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif 529 * @work: work queue item 530 * 531 * Free the parts of the hard interface which can not be removed under 532 * rtnl lock (to prevent deadlock situations). 533 */ 534 static void batadv_hardif_remove_interface_finish(struct work_struct *work) 535 { 536 struct batadv_hard_iface *hard_iface; 537 538 hard_iface = container_of(work, struct batadv_hard_iface, 539 cleanup_work); 540 541 batadv_debugfs_del_hardif(hard_iface); 542 batadv_sysfs_del_hardif(&hard_iface->hardif_obj); 543 batadv_hardif_free_ref(hard_iface); 544 } 545 546 static struct batadv_hard_iface * 547 batadv_hardif_add_interface(struct net_device *net_dev) 548 { 549 struct batadv_hard_iface *hard_iface; 550 int ret; 551 552 ASSERT_RTNL(); 553 554 ret = batadv_is_valid_iface(net_dev); 555 if (ret != 1) 556 goto out; 557 558 dev_hold(net_dev); 559 560 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); 561 if (!hard_iface) 562 goto release_dev; 563 564 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); 565 if (ret) 566 goto free_if; 567 568 hard_iface->if_num = -1; 569 hard_iface->net_dev = net_dev; 570 hard_iface->soft_iface = NULL; 571 hard_iface->if_status = BATADV_IF_NOT_IN_USE; 572 573 ret = batadv_debugfs_add_hardif(hard_iface); 574 if (ret) 575 goto free_sysfs; 576 577 INIT_LIST_HEAD(&hard_iface->list); 578 INIT_WORK(&hard_iface->cleanup_work, 579 batadv_hardif_remove_interface_finish); 580 581 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; 582 if (batadv_is_wifi_netdev(net_dev)) 583 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; 584 585 /* extra reference for return */ 586 atomic_set(&hard_iface->refcount, 2); 587 588 batadv_check_known_mac_addr(hard_iface->net_dev); 589 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); 590 591 return hard_iface; 592 593 free_sysfs: 594 batadv_sysfs_del_hardif(&hard_iface->hardif_obj); 595 free_if: 596 kfree(hard_iface); 597 release_dev: 598 dev_put(net_dev); 599 out: 600 return NULL; 601 } 602 603 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) 604 { 605 ASSERT_RTNL(); 606 607 /* first deactivate interface */ 608 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) 609 batadv_hardif_disable_interface(hard_iface, 610 BATADV_IF_CLEANUP_AUTO); 611 612 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) 613 return; 614 615 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; 616 queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); 617 } 618 619 void batadv_hardif_remove_interfaces(void) 620 { 621 struct batadv_hard_iface *hard_iface, *hard_iface_tmp; 622 623 rtnl_lock(); 624 list_for_each_entry_safe(hard_iface, hard_iface_tmp, 625 &batadv_hardif_list, list) { 626 list_del_rcu(&hard_iface->list); 627 batadv_hardif_remove_interface(hard_iface); 628 } 629 rtnl_unlock(); 630 } 631 632 static int batadv_hard_if_event(struct notifier_block *this, 633 unsigned long event, void *ptr) 634 { 635 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); 636 struct batadv_hard_iface *hard_iface; 637 struct batadv_hard_iface *primary_if = NULL; 638 struct batadv_priv *bat_priv; 639 640 if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { 641 batadv_sysfs_add_meshif(net_dev); 642 bat_priv = netdev_priv(net_dev); 643 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); 644 return NOTIFY_DONE; 645 } 646 647 hard_iface = batadv_hardif_get_by_netdev(net_dev); 648 if (!hard_iface && event == NETDEV_REGISTER) 649 hard_iface = batadv_hardif_add_interface(net_dev); 650 651 if (!hard_iface) 652 goto out; 653 654 switch (event) { 655 case NETDEV_UP: 656 batadv_hardif_activate_interface(hard_iface); 657 break; 658 case NETDEV_GOING_DOWN: 659 case NETDEV_DOWN: 660 batadv_hardif_deactivate_interface(hard_iface); 661 break; 662 case NETDEV_UNREGISTER: 663 list_del_rcu(&hard_iface->list); 664 665 batadv_hardif_remove_interface(hard_iface); 666 break; 667 case NETDEV_CHANGEMTU: 668 if (hard_iface->soft_iface) 669 batadv_update_min_mtu(hard_iface->soft_iface); 670 break; 671 case NETDEV_CHANGEADDR: 672 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) 673 goto hardif_put; 674 675 batadv_check_known_mac_addr(hard_iface->net_dev); 676 677 bat_priv = netdev_priv(hard_iface->soft_iface); 678 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); 679 680 primary_if = batadv_primary_if_get_selected(bat_priv); 681 if (!primary_if) 682 goto hardif_put; 683 684 if (hard_iface == primary_if) 685 batadv_primary_if_update_addr(bat_priv, NULL); 686 break; 687 default: 688 break; 689 } 690 691 hardif_put: 692 batadv_hardif_free_ref(hard_iface); 693 out: 694 if (primary_if) 695 batadv_hardif_free_ref(primary_if); 696 return NOTIFY_DONE; 697 } 698 699 struct notifier_block batadv_hard_if_notifier = { 700 .notifier_call = batadv_hard_if_event, 701 }; 702