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
batadv_hardif_free_rcu(struct rcu_head * rcu)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 *
batadv_hardif_get_by_netdev(const struct net_device * net_dev)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 */
batadv_is_on_batman_iface(const struct net_device * net_dev)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
batadv_is_valid_iface(const struct net_device * net_dev)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 static struct batadv_hard_iface *
batadv_hardif_get_active(const struct net_device * soft_iface)121 batadv_hardif_get_active(const struct net_device *soft_iface)
122 {
123 struct batadv_hard_iface *hard_iface;
124
125 rcu_read_lock();
126 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
127 if (hard_iface->soft_iface != soft_iface)
128 continue;
129
130 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
131 atomic_inc_not_zero(&hard_iface->refcount))
132 goto out;
133 }
134
135 hard_iface = NULL;
136
137 out:
138 rcu_read_unlock();
139 return hard_iface;
140 }
141
batadv_primary_if_update_addr(struct batadv_priv * bat_priv,struct batadv_hard_iface * oldif)142 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
143 struct batadv_hard_iface *oldif)
144 {
145 struct batadv_vis_packet *vis_packet;
146 struct batadv_hard_iface *primary_if;
147 struct sk_buff *skb;
148
149 primary_if = batadv_primary_if_get_selected(bat_priv);
150 if (!primary_if)
151 goto out;
152
153 batadv_dat_init_own_addr(bat_priv, primary_if);
154
155 skb = bat_priv->vis.my_info->skb_packet;
156 vis_packet = (struct batadv_vis_packet *)skb->data;
157 memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
158 memcpy(vis_packet->sender_orig,
159 primary_if->net_dev->dev_addr, ETH_ALEN);
160
161 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
162 out:
163 if (primary_if)
164 batadv_hardif_free_ref(primary_if);
165 }
166
batadv_primary_if_select(struct batadv_priv * bat_priv,struct batadv_hard_iface * new_hard_iface)167 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
168 struct batadv_hard_iface *new_hard_iface)
169 {
170 struct batadv_hard_iface *curr_hard_iface;
171
172 ASSERT_RTNL();
173
174 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
175 new_hard_iface = NULL;
176
177 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
178 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
179
180 if (!new_hard_iface)
181 goto out;
182
183 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
184 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
185
186 out:
187 if (curr_hard_iface)
188 batadv_hardif_free_ref(curr_hard_iface);
189 }
190
191 static bool
batadv_hardif_is_iface_up(const struct batadv_hard_iface * hard_iface)192 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
193 {
194 if (hard_iface->net_dev->flags & IFF_UP)
195 return true;
196
197 return false;
198 }
199
batadv_check_known_mac_addr(const struct net_device * net_dev)200 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
201 {
202 const struct batadv_hard_iface *hard_iface;
203
204 rcu_read_lock();
205 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
206 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
207 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
208 continue;
209
210 if (hard_iface->net_dev == net_dev)
211 continue;
212
213 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
214 net_dev->dev_addr))
215 continue;
216
217 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
218 net_dev->dev_addr, hard_iface->net_dev->name);
219 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
220 }
221 rcu_read_unlock();
222 }
223
batadv_hardif_min_mtu(struct net_device * soft_iface)224 int batadv_hardif_min_mtu(struct net_device *soft_iface)
225 {
226 const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
227 const struct batadv_hard_iface *hard_iface;
228 /* allow big frames if all devices are capable to do so
229 * (have MTU > 1500 + BAT_HEADER_LEN)
230 */
231 int min_mtu = ETH_DATA_LEN;
232
233 if (atomic_read(&bat_priv->fragmentation))
234 goto out;
235
236 rcu_read_lock();
237 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
238 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
239 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
240 continue;
241
242 if (hard_iface->soft_iface != soft_iface)
243 continue;
244
245 min_mtu = min_t(int,
246 hard_iface->net_dev->mtu - BATADV_HEADER_LEN,
247 min_mtu);
248 }
249 rcu_read_unlock();
250 out:
251 return min_mtu;
252 }
253
254 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
batadv_update_min_mtu(struct net_device * soft_iface)255 void batadv_update_min_mtu(struct net_device *soft_iface)
256 {
257 int min_mtu;
258
259 min_mtu = batadv_hardif_min_mtu(soft_iface);
260 if (soft_iface->mtu != min_mtu)
261 soft_iface->mtu = min_mtu;
262 }
263
264 static void
batadv_hardif_activate_interface(struct batadv_hard_iface * hard_iface)265 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
266 {
267 struct batadv_priv *bat_priv;
268 struct batadv_hard_iface *primary_if = NULL;
269
270 if (hard_iface->if_status != BATADV_IF_INACTIVE)
271 goto out;
272
273 bat_priv = netdev_priv(hard_iface->soft_iface);
274
275 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
276 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
277
278 /* the first active interface becomes our primary interface or
279 * the next active interface after the old primary interface was removed
280 */
281 primary_if = batadv_primary_if_get_selected(bat_priv);
282 if (!primary_if)
283 batadv_primary_if_select(bat_priv, hard_iface);
284
285 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
286 hard_iface->net_dev->name);
287
288 batadv_update_min_mtu(hard_iface->soft_iface);
289
290 out:
291 if (primary_if)
292 batadv_hardif_free_ref(primary_if);
293 }
294
295 static void
batadv_hardif_deactivate_interface(struct batadv_hard_iface * hard_iface)296 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
297 {
298 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
299 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
300 return;
301
302 hard_iface->if_status = BATADV_IF_INACTIVE;
303
304 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
305 hard_iface->net_dev->name);
306
307 batadv_update_min_mtu(hard_iface->soft_iface);
308 }
309
310 /**
311 * batadv_master_del_slave - remove hard_iface from the current master interface
312 * @slave: the interface enslaved in another master
313 * @master: the master from which slave has to be removed
314 *
315 * Invoke ndo_del_slave on master passing slave as argument. In this way slave
316 * is free'd and master can correctly change its internal state.
317 * Return 0 on success, a negative value representing the error otherwise
318 */
batadv_master_del_slave(struct batadv_hard_iface * slave,struct net_device * master)319 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
320 struct net_device *master)
321 {
322 int ret;
323
324 if (!master)
325 return 0;
326
327 ret = -EBUSY;
328 if (master->netdev_ops->ndo_del_slave)
329 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
330
331 return ret;
332 }
333
batadv_hardif_enable_interface(struct batadv_hard_iface * hard_iface,const char * iface_name)334 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
335 const char *iface_name)
336 {
337 struct batadv_priv *bat_priv;
338 struct net_device *soft_iface, *master;
339 __be16 ethertype = __constant_htons(ETH_P_BATMAN);
340 int ret;
341
342 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
343 goto out;
344
345 if (!atomic_inc_not_zero(&hard_iface->refcount))
346 goto out;
347
348 soft_iface = dev_get_by_name(&init_net, iface_name);
349
350 if (!soft_iface) {
351 soft_iface = batadv_softif_create(iface_name);
352
353 if (!soft_iface) {
354 ret = -ENOMEM;
355 goto err;
356 }
357
358 /* dev_get_by_name() increases the reference counter for us */
359 dev_hold(soft_iface);
360 }
361
362 if (!batadv_softif_is_valid(soft_iface)) {
363 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
364 soft_iface->name);
365 ret = -EINVAL;
366 goto err_dev;
367 }
368
369 /* check if the interface is enslaved in another virtual one and
370 * in that case unlink it first
371 */
372 master = netdev_master_upper_dev_get(hard_iface->net_dev);
373 ret = batadv_master_del_slave(hard_iface, master);
374 if (ret)
375 goto err_dev;
376
377 hard_iface->soft_iface = soft_iface;
378 bat_priv = netdev_priv(hard_iface->soft_iface);
379
380 ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
381 if (ret)
382 goto err_dev;
383
384 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
385 if (ret < 0)
386 goto err_upper;
387
388 hard_iface->if_num = bat_priv->num_ifaces;
389 bat_priv->num_ifaces++;
390 hard_iface->if_status = BATADV_IF_INACTIVE;
391 ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
392 if (ret < 0) {
393 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
394 bat_priv->num_ifaces--;
395 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
396 goto err_upper;
397 }
398
399 hard_iface->batman_adv_ptype.type = ethertype;
400 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
401 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
402 dev_add_pack(&hard_iface->batman_adv_ptype);
403
404 atomic_set(&hard_iface->frag_seqno, 1);
405 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
406 hard_iface->net_dev->name);
407
408 if (atomic_read(&bat_priv->fragmentation) &&
409 hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
410 batadv_info(hard_iface->soft_iface,
411 "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",
412 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
413 ETH_DATA_LEN + BATADV_HEADER_LEN);
414
415 if (!atomic_read(&bat_priv->fragmentation) &&
416 hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
417 batadv_info(hard_iface->soft_iface,
418 "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",
419 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
420 ETH_DATA_LEN + BATADV_HEADER_LEN);
421
422 if (batadv_hardif_is_iface_up(hard_iface))
423 batadv_hardif_activate_interface(hard_iface);
424 else
425 batadv_err(hard_iface->soft_iface,
426 "Not using interface %s (retrying later): interface not active\n",
427 hard_iface->net_dev->name);
428
429 /* begin scheduling originator messages on that interface */
430 batadv_schedule_bat_ogm(hard_iface);
431
432 out:
433 return 0;
434
435 err_upper:
436 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
437 err_dev:
438 hard_iface->soft_iface = NULL;
439 dev_put(soft_iface);
440 err:
441 batadv_hardif_free_ref(hard_iface);
442 return ret;
443 }
444
batadv_hardif_disable_interface(struct batadv_hard_iface * hard_iface,enum batadv_hard_if_cleanup autodel)445 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
446 enum batadv_hard_if_cleanup autodel)
447 {
448 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
449 struct batadv_hard_iface *primary_if = NULL;
450
451 if (hard_iface->if_status == BATADV_IF_ACTIVE)
452 batadv_hardif_deactivate_interface(hard_iface);
453
454 if (hard_iface->if_status != BATADV_IF_INACTIVE)
455 goto out;
456
457 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
458 hard_iface->net_dev->name);
459 dev_remove_pack(&hard_iface->batman_adv_ptype);
460
461 bat_priv->num_ifaces--;
462 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
463
464 primary_if = batadv_primary_if_get_selected(bat_priv);
465 if (hard_iface == primary_if) {
466 struct batadv_hard_iface *new_if;
467
468 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
469 batadv_primary_if_select(bat_priv, new_if);
470
471 if (new_if)
472 batadv_hardif_free_ref(new_if);
473 }
474
475 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
476 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
477
478 /* delete all references to this hard_iface */
479 batadv_purge_orig_ref(bat_priv);
480 batadv_purge_outstanding_packets(bat_priv, hard_iface);
481 dev_put(hard_iface->soft_iface);
482
483 /* nobody uses this interface anymore */
484 if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO)
485 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
486
487 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
488 hard_iface->soft_iface = NULL;
489 batadv_hardif_free_ref(hard_iface);
490
491 out:
492 if (primary_if)
493 batadv_hardif_free_ref(primary_if);
494 }
495
496 /**
497 * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
498 * @work: work queue item
499 *
500 * Free the parts of the hard interface which can not be removed under
501 * rtnl lock (to prevent deadlock situations).
502 */
batadv_hardif_remove_interface_finish(struct work_struct * work)503 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
504 {
505 struct batadv_hard_iface *hard_iface;
506
507 hard_iface = container_of(work, struct batadv_hard_iface,
508 cleanup_work);
509
510 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
511 batadv_hardif_free_ref(hard_iface);
512 }
513
514 static struct batadv_hard_iface *
batadv_hardif_add_interface(struct net_device * net_dev)515 batadv_hardif_add_interface(struct net_device *net_dev)
516 {
517 struct batadv_hard_iface *hard_iface;
518 int ret;
519
520 ASSERT_RTNL();
521
522 ret = batadv_is_valid_iface(net_dev);
523 if (ret != 1)
524 goto out;
525
526 dev_hold(net_dev);
527
528 hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
529 if (!hard_iface)
530 goto release_dev;
531
532 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
533 if (ret)
534 goto free_if;
535
536 hard_iface->if_num = -1;
537 hard_iface->net_dev = net_dev;
538 hard_iface->soft_iface = NULL;
539 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
540 INIT_LIST_HEAD(&hard_iface->list);
541 INIT_WORK(&hard_iface->cleanup_work,
542 batadv_hardif_remove_interface_finish);
543
544 /* extra reference for return */
545 atomic_set(&hard_iface->refcount, 2);
546
547 batadv_check_known_mac_addr(hard_iface->net_dev);
548 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
549
550 /* This can't be called via a bat_priv callback because
551 * we have no bat_priv yet.
552 */
553 atomic_set(&hard_iface->bat_iv.ogm_seqno, 1);
554 hard_iface->bat_iv.ogm_buff = NULL;
555
556 return hard_iface;
557
558 free_if:
559 kfree(hard_iface);
560 release_dev:
561 dev_put(net_dev);
562 out:
563 return NULL;
564 }
565
batadv_hardif_remove_interface(struct batadv_hard_iface * hard_iface)566 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
567 {
568 ASSERT_RTNL();
569
570 /* first deactivate interface */
571 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
572 batadv_hardif_disable_interface(hard_iface,
573 BATADV_IF_CLEANUP_AUTO);
574
575 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
576 return;
577
578 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
579 queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
580 }
581
batadv_hardif_remove_interfaces(void)582 void batadv_hardif_remove_interfaces(void)
583 {
584 struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
585
586 rtnl_lock();
587 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
588 &batadv_hardif_list, list) {
589 list_del_rcu(&hard_iface->list);
590 batadv_hardif_remove_interface(hard_iface);
591 }
592 rtnl_unlock();
593 }
594
batadv_hard_if_event(struct notifier_block * this,unsigned long event,void * ptr)595 static int batadv_hard_if_event(struct notifier_block *this,
596 unsigned long event, void *ptr)
597 {
598 struct net_device *net_dev = ptr;
599 struct batadv_hard_iface *hard_iface;
600 struct batadv_hard_iface *primary_if = NULL;
601 struct batadv_priv *bat_priv;
602
603 if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
604 batadv_sysfs_add_meshif(net_dev);
605 return NOTIFY_DONE;
606 }
607
608 hard_iface = batadv_hardif_get_by_netdev(net_dev);
609 if (!hard_iface && event == NETDEV_REGISTER)
610 hard_iface = batadv_hardif_add_interface(net_dev);
611
612 if (!hard_iface)
613 goto out;
614
615 switch (event) {
616 case NETDEV_UP:
617 batadv_hardif_activate_interface(hard_iface);
618 break;
619 case NETDEV_GOING_DOWN:
620 case NETDEV_DOWN:
621 batadv_hardif_deactivate_interface(hard_iface);
622 break;
623 case NETDEV_UNREGISTER:
624 list_del_rcu(&hard_iface->list);
625
626 batadv_hardif_remove_interface(hard_iface);
627 break;
628 case NETDEV_CHANGEMTU:
629 if (hard_iface->soft_iface)
630 batadv_update_min_mtu(hard_iface->soft_iface);
631 break;
632 case NETDEV_CHANGEADDR:
633 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
634 goto hardif_put;
635
636 batadv_check_known_mac_addr(hard_iface->net_dev);
637
638 bat_priv = netdev_priv(hard_iface->soft_iface);
639 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
640
641 primary_if = batadv_primary_if_get_selected(bat_priv);
642 if (!primary_if)
643 goto hardif_put;
644
645 if (hard_iface == primary_if)
646 batadv_primary_if_update_addr(bat_priv, NULL);
647 break;
648 default:
649 break;
650 }
651
652 hardif_put:
653 batadv_hardif_free_ref(hard_iface);
654 out:
655 if (primary_if)
656 batadv_hardif_free_ref(primary_if);
657 return NOTIFY_DONE;
658 }
659
660 /* This function returns true if the interface represented by ifindex is a
661 * 802.11 wireless device
662 */
batadv_is_wifi_iface(int ifindex)663 bool batadv_is_wifi_iface(int ifindex)
664 {
665 struct net_device *net_device = NULL;
666 bool ret = false;
667
668 if (ifindex == BATADV_NULL_IFINDEX)
669 goto out;
670
671 net_device = dev_get_by_index(&init_net, ifindex);
672 if (!net_device)
673 goto out;
674
675 #ifdef CONFIG_WIRELESS_EXT
676 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
677 * check for wireless_handlers != NULL
678 */
679 if (net_device->wireless_handlers)
680 ret = true;
681 else
682 #endif
683 /* cfg80211 drivers have to set ieee80211_ptr */
684 if (net_device->ieee80211_ptr)
685 ret = true;
686 out:
687 if (net_device)
688 dev_put(net_device);
689 return ret;
690 }
691
692 struct notifier_block batadv_hard_if_notifier = {
693 .notifier_call = batadv_hard_if_event,
694 };
695