cfg80211: fix refcount imbalance when wext is disabled
[linux-2.6.git] / net / wireless / core.c
1 /*
2  * This is the linux wireless configuration interface.
3  *
4  * Copyright 2006-2009          Johannes Berg <johannes@sipsolutions.net>
5  */
6
7 #include <linux/if.h>
8 #include <linux/module.h>
9 #include <linux/err.h>
10 #include <linux/list.h>
11 #include <linux/nl80211.h>
12 #include <linux/debugfs.h>
13 #include <linux/notifier.h>
14 #include <linux/device.h>
15 #include <linux/etherdevice.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/sched.h>
18 #include <net/genetlink.h>
19 #include <net/cfg80211.h>
20 #include "nl80211.h"
21 #include "core.h"
22 #include "sysfs.h"
23 #include "debugfs.h"
24 #include "wext-compat.h"
25 #include "ethtool.h"
26
27 /* name for sysfs, %d is appended */
28 #define PHY_NAME "phy"
29
30 MODULE_AUTHOR("Johannes Berg");
31 MODULE_LICENSE("GPL");
32 MODULE_DESCRIPTION("wireless configuration support");
33
34 /* RCU might be appropriate here since we usually
35  * only read the list, and that can happen quite
36  * often because we need to do it for each command */
37 LIST_HEAD(cfg80211_rdev_list);
38 int cfg80211_rdev_list_generation;
39
40 /*
41  * This is used to protect the cfg80211_rdev_list
42  */
43 DEFINE_MUTEX(cfg80211_mutex);
44
45 /* for debugfs */
46 static struct dentry *ieee80211_debugfs_dir;
47
48 /* for the cleanup, scan and event works */
49 struct workqueue_struct *cfg80211_wq;
50
51 /* requires cfg80211_mutex to be held! */
52 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
53 {
54         struct cfg80211_registered_device *result = NULL, *rdev;
55
56         if (!wiphy_idx_valid(wiphy_idx))
57                 return NULL;
58
59         assert_cfg80211_lock();
60
61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
62                 if (rdev->wiphy_idx == wiphy_idx) {
63                         result = rdev;
64                         break;
65                 }
66         }
67
68         return result;
69 }
70
71 int get_wiphy_idx(struct wiphy *wiphy)
72 {
73         struct cfg80211_registered_device *rdev;
74         if (!wiphy)
75                 return WIPHY_IDX_STALE;
76         rdev = wiphy_to_dev(wiphy);
77         return rdev->wiphy_idx;
78 }
79
80 /* requires cfg80211_rdev_mutex to be held! */
81 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
82 {
83         struct cfg80211_registered_device *rdev;
84
85         if (!wiphy_idx_valid(wiphy_idx))
86                 return NULL;
87
88         assert_cfg80211_lock();
89
90         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
91         if (!rdev)
92                 return NULL;
93         return &rdev->wiphy;
94 }
95
96 /* requires cfg80211_mutex to be held! */
97 struct cfg80211_registered_device *
98 __cfg80211_rdev_from_info(struct genl_info *info)
99 {
100         int ifindex;
101         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
102         struct net_device *dev;
103         int err = -EINVAL;
104
105         assert_cfg80211_lock();
106
107         if (info->attrs[NL80211_ATTR_WIPHY]) {
108                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
109                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
110                 err = -ENODEV;
111         }
112
113         if (info->attrs[NL80211_ATTR_IFINDEX]) {
114                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
115                 dev = dev_get_by_index(genl_info_net(info), ifindex);
116                 if (dev) {
117                         if (dev->ieee80211_ptr)
118                                 byifidx =
119                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
120                         dev_put(dev);
121                 }
122                 err = -ENODEV;
123         }
124
125         if (bywiphyidx && byifidx) {
126                 if (bywiphyidx != byifidx)
127                         return ERR_PTR(-EINVAL);
128                 else
129                         return bywiphyidx; /* == byifidx */
130         }
131         if (bywiphyidx)
132                 return bywiphyidx;
133
134         if (byifidx)
135                 return byifidx;
136
137         return ERR_PTR(err);
138 }
139
140 struct cfg80211_registered_device *
141 cfg80211_get_dev_from_info(struct genl_info *info)
142 {
143         struct cfg80211_registered_device *rdev;
144
145         mutex_lock(&cfg80211_mutex);
146         rdev = __cfg80211_rdev_from_info(info);
147
148         /* if it is not an error we grab the lock on
149          * it to assure it won't be going away while
150          * we operate on it */
151         if (!IS_ERR(rdev))
152                 mutex_lock(&rdev->mtx);
153
154         mutex_unlock(&cfg80211_mutex);
155
156         return rdev;
157 }
158
159 struct cfg80211_registered_device *
160 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
161 {
162         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
163         struct net_device *dev;
164
165         mutex_lock(&cfg80211_mutex);
166         dev = dev_get_by_index(net, ifindex);
167         if (!dev)
168                 goto out;
169         if (dev->ieee80211_ptr) {
170                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
171                 mutex_lock(&rdev->mtx);
172         } else
173                 rdev = ERR_PTR(-ENODEV);
174         dev_put(dev);
175  out:
176         mutex_unlock(&cfg80211_mutex);
177         return rdev;
178 }
179
180 /* requires cfg80211_mutex to be held */
181 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
182                         char *newname)
183 {
184         struct cfg80211_registered_device *rdev2;
185         int wiphy_idx, taken = -1, result, digits;
186
187         assert_cfg80211_lock();
188
189         /* prohibit calling the thing phy%d when %d is not its number */
190         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
191         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
192                 /* count number of places needed to print wiphy_idx */
193                 digits = 1;
194                 while (wiphy_idx /= 10)
195                         digits++;
196                 /*
197                  * deny the name if it is phy<idx> where <idx> is printed
198                  * without leading zeroes. taken == strlen(newname) here
199                  */
200                 if (taken == strlen(PHY_NAME) + digits)
201                         return -EINVAL;
202         }
203
204
205         /* Ignore nop renames */
206         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
207                 return 0;
208
209         /* Ensure another device does not already have this name. */
210         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
211                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
212                         return -EINVAL;
213
214         result = device_rename(&rdev->wiphy.dev, newname);
215         if (result)
216                 return result;
217
218         if (rdev->wiphy.debugfsdir &&
219             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
220                             rdev->wiphy.debugfsdir,
221                             rdev->wiphy.debugfsdir->d_parent,
222                             newname))
223                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
224                        newname);
225
226         nl80211_notify_dev_rename(rdev);
227
228         return 0;
229 }
230
231 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
232                           struct net *net)
233 {
234         struct wireless_dev *wdev;
235         int err = 0;
236
237         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
238                 return -EOPNOTSUPP;
239
240         list_for_each_entry(wdev, &rdev->netdev_list, list) {
241                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
242                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
243                 if (err)
244                         break;
245                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
246         }
247
248         if (err) {
249                 /* failed -- clean up to old netns */
250                 net = wiphy_net(&rdev->wiphy);
251
252                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
253                                                      list) {
254                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
255                         err = dev_change_net_namespace(wdev->netdev, net,
256                                                         "wlan%d");
257                         WARN_ON(err);
258                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
259                 }
260         }
261
262         wiphy_net_set(&rdev->wiphy, net);
263
264         return err;
265 }
266
267 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
268 {
269         struct cfg80211_registered_device *rdev = data;
270
271         rdev->ops->rfkill_poll(&rdev->wiphy);
272 }
273
274 static int cfg80211_rfkill_set_block(void *data, bool blocked)
275 {
276         struct cfg80211_registered_device *rdev = data;
277         struct wireless_dev *wdev;
278
279         if (!blocked)
280                 return 0;
281
282         rtnl_lock();
283         mutex_lock(&rdev->devlist_mtx);
284
285         list_for_each_entry(wdev, &rdev->netdev_list, list)
286                 dev_close(wdev->netdev);
287
288         mutex_unlock(&rdev->devlist_mtx);
289         rtnl_unlock();
290
291         return 0;
292 }
293
294 static void cfg80211_rfkill_sync_work(struct work_struct *work)
295 {
296         struct cfg80211_registered_device *rdev;
297
298         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
299         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
300 }
301
302 static void cfg80211_event_work(struct work_struct *work)
303 {
304         struct cfg80211_registered_device *rdev;
305
306         rdev = container_of(work, struct cfg80211_registered_device,
307                             event_work);
308
309         rtnl_lock();
310         cfg80211_lock_rdev(rdev);
311
312         cfg80211_process_rdev_events(rdev);
313         cfg80211_unlock_rdev(rdev);
314         rtnl_unlock();
315 }
316
317 /* exported functions */
318
319 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
320 {
321         static int wiphy_counter;
322
323         struct cfg80211_registered_device *rdev;
324         int alloc_size;
325
326         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
327         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
328         WARN_ON(ops->connect && !ops->disconnect);
329         WARN_ON(ops->join_ibss && !ops->leave_ibss);
330         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
331         WARN_ON(ops->add_station && !ops->del_station);
332         WARN_ON(ops->add_mpath && !ops->del_mpath);
333
334         alloc_size = sizeof(*rdev) + sizeof_priv;
335
336         rdev = kzalloc(alloc_size, GFP_KERNEL);
337         if (!rdev)
338                 return NULL;
339
340         rdev->ops = ops;
341
342         mutex_lock(&cfg80211_mutex);
343
344         rdev->wiphy_idx = wiphy_counter++;
345
346         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
347                 wiphy_counter--;
348                 mutex_unlock(&cfg80211_mutex);
349                 /* ugh, wrapped! */
350                 kfree(rdev);
351                 return NULL;
352         }
353
354         mutex_unlock(&cfg80211_mutex);
355
356         /* give it a proper name */
357         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
358
359         mutex_init(&rdev->mtx);
360         mutex_init(&rdev->devlist_mtx);
361         INIT_LIST_HEAD(&rdev->netdev_list);
362         spin_lock_init(&rdev->bss_lock);
363         INIT_LIST_HEAD(&rdev->bss_list);
364         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
365
366 #ifdef CONFIG_CFG80211_WEXT
367         rdev->wiphy.wext = &cfg80211_wext_handler;
368 #endif
369
370         device_initialize(&rdev->wiphy.dev);
371         rdev->wiphy.dev.class = &ieee80211_class;
372         rdev->wiphy.dev.platform_data = rdev;
373
374 #ifdef CONFIG_CFG80211_DEFAULT_PS
375         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
376 #endif
377
378         wiphy_net_set(&rdev->wiphy, &init_net);
379
380         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
381         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
382                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
383                                    &rdev->rfkill_ops, rdev);
384
385         if (!rdev->rfkill) {
386                 kfree(rdev);
387                 return NULL;
388         }
389
390         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
391         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
392         INIT_WORK(&rdev->event_work, cfg80211_event_work);
393
394         init_waitqueue_head(&rdev->dev_wait);
395
396         /*
397          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
398          * Fragmentation and RTS threshold are disabled by default with the
399          * special -1 value.
400          */
401         rdev->wiphy.retry_short = 7;
402         rdev->wiphy.retry_long = 4;
403         rdev->wiphy.frag_threshold = (u32) -1;
404         rdev->wiphy.rts_threshold = (u32) -1;
405
406         return &rdev->wiphy;
407 }
408 EXPORT_SYMBOL(wiphy_new);
409
410 int wiphy_register(struct wiphy *wiphy)
411 {
412         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
413         int res;
414         enum ieee80211_band band;
415         struct ieee80211_supported_band *sband;
416         bool have_band = false;
417         int i;
418         u16 ifmodes = wiphy->interface_modes;
419
420         /* sanity check ifmodes */
421         WARN_ON(!ifmodes);
422         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
423         if (WARN_ON(ifmodes != wiphy->interface_modes))
424                 wiphy->interface_modes = ifmodes;
425
426         /* sanity check supported bands/channels */
427         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
428                 sband = wiphy->bands[band];
429                 if (!sband)
430                         continue;
431
432                 sband->band = band;
433
434                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
435                         return -EINVAL;
436
437                 /*
438                  * Since we use a u32 for rate bitmaps in
439                  * ieee80211_get_response_rate, we cannot
440                  * have more than 32 legacy rates.
441                  */
442                 if (WARN_ON(sband->n_bitrates > 32))
443                         return -EINVAL;
444
445                 for (i = 0; i < sband->n_channels; i++) {
446                         sband->channels[i].orig_flags =
447                                 sband->channels[i].flags;
448                         sband->channels[i].orig_mag =
449                                 sband->channels[i].max_antenna_gain;
450                         sband->channels[i].orig_mpwr =
451                                 sband->channels[i].max_power;
452                         sband->channels[i].band = band;
453                 }
454
455                 have_band = true;
456         }
457
458         if (!have_band) {
459                 WARN_ON(1);
460                 return -EINVAL;
461         }
462
463         /* check and set up bitrates */
464         ieee80211_set_bitrate_flags(wiphy);
465
466         res = device_add(&rdev->wiphy.dev);
467         if (res)
468                 return res;
469
470         res = rfkill_register(rdev->rfkill);
471         if (res)
472                 goto out_rm_dev;
473
474         mutex_lock(&cfg80211_mutex);
475
476         /* set up regulatory info */
477         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
478
479         list_add(&rdev->list, &cfg80211_rdev_list);
480         cfg80211_rdev_list_generation++;
481
482         mutex_unlock(&cfg80211_mutex);
483
484         /* add to debugfs */
485         rdev->wiphy.debugfsdir =
486                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
487                                    ieee80211_debugfs_dir);
488         if (IS_ERR(rdev->wiphy.debugfsdir))
489                 rdev->wiphy.debugfsdir = NULL;
490
491         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
492                 struct regulatory_request request;
493
494                 request.wiphy_idx = get_wiphy_idx(wiphy);
495                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
496                 request.alpha2[0] = '9';
497                 request.alpha2[1] = '9';
498
499                 nl80211_send_reg_change_event(&request);
500         }
501
502         cfg80211_debugfs_rdev_add(rdev);
503
504         return 0;
505
506  out_rm_dev:
507         device_del(&rdev->wiphy.dev);
508         return res;
509 }
510 EXPORT_SYMBOL(wiphy_register);
511
512 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
513 {
514         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
515
516         if (!rdev->ops->rfkill_poll)
517                 return;
518         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
519         rfkill_resume_polling(rdev->rfkill);
520 }
521 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
522
523 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
524 {
525         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
526
527         rfkill_pause_polling(rdev->rfkill);
528 }
529 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
530
531 void wiphy_unregister(struct wiphy *wiphy)
532 {
533         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
534
535         rfkill_unregister(rdev->rfkill);
536
537         /* protect the device list */
538         mutex_lock(&cfg80211_mutex);
539
540         wait_event(rdev->dev_wait, ({
541                 int __count;
542                 mutex_lock(&rdev->devlist_mtx);
543                 __count = rdev->opencount;
544                 mutex_unlock(&rdev->devlist_mtx);
545                 __count == 0;}));
546
547         mutex_lock(&rdev->devlist_mtx);
548         BUG_ON(!list_empty(&rdev->netdev_list));
549         mutex_unlock(&rdev->devlist_mtx);
550
551         /*
552          * First remove the hardware from everywhere, this makes
553          * it impossible to find from userspace.
554          */
555         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
556         list_del(&rdev->list);
557
558         /*
559          * Try to grab rdev->mtx. If a command is still in progress,
560          * hopefully the driver will refuse it since it's tearing
561          * down the device already. We wait for this command to complete
562          * before unlinking the item from the list.
563          * Note: as codified by the BUG_ON above we cannot get here if
564          * a virtual interface is still present. Hence, we can only get
565          * to lock contention here if userspace issues a command that
566          * identified the hardware by wiphy index.
567          */
568         cfg80211_lock_rdev(rdev);
569         /* nothing */
570         cfg80211_unlock_rdev(rdev);
571
572         /* If this device got a regulatory hint tell core its
573          * free to listen now to a new shiny device regulatory hint */
574         reg_device_remove(wiphy);
575
576         cfg80211_rdev_list_generation++;
577         device_del(&rdev->wiphy.dev);
578
579         mutex_unlock(&cfg80211_mutex);
580
581         flush_work(&rdev->scan_done_wk);
582         cancel_work_sync(&rdev->conn_work);
583         flush_work(&rdev->event_work);
584 }
585 EXPORT_SYMBOL(wiphy_unregister);
586
587 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
588 {
589         struct cfg80211_internal_bss *scan, *tmp;
590         rfkill_destroy(rdev->rfkill);
591         mutex_destroy(&rdev->mtx);
592         mutex_destroy(&rdev->devlist_mtx);
593         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
594                 cfg80211_put_bss(&scan->pub);
595         kfree(rdev);
596 }
597
598 void wiphy_free(struct wiphy *wiphy)
599 {
600         put_device(&wiphy->dev);
601 }
602 EXPORT_SYMBOL(wiphy_free);
603
604 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
605 {
606         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
607
608         if (rfkill_set_hw_state(rdev->rfkill, blocked))
609                 schedule_work(&rdev->rfkill_sync);
610 }
611 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
612
613 static void wdev_cleanup_work(struct work_struct *work)
614 {
615         struct wireless_dev *wdev;
616         struct cfg80211_registered_device *rdev;
617
618         wdev = container_of(work, struct wireless_dev, cleanup_work);
619         rdev = wiphy_to_dev(wdev->wiphy);
620
621         cfg80211_lock_rdev(rdev);
622
623         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
624                 rdev->scan_req->aborted = true;
625                 ___cfg80211_scan_done(rdev, true);
626         }
627
628         cfg80211_unlock_rdev(rdev);
629
630         mutex_lock(&rdev->devlist_mtx);
631         rdev->opencount--;
632         mutex_unlock(&rdev->devlist_mtx);
633         wake_up(&rdev->dev_wait);
634
635         dev_put(wdev->netdev);
636 }
637
638 static struct device_type wiphy_type = {
639         .name   = "wlan",
640 };
641
642 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
643                                          unsigned long state,
644                                          void *ndev)
645 {
646         struct net_device *dev = ndev;
647         struct wireless_dev *wdev = dev->ieee80211_ptr;
648         struct cfg80211_registered_device *rdev;
649
650         if (!wdev)
651                 return NOTIFY_DONE;
652
653         rdev = wiphy_to_dev(wdev->wiphy);
654
655         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
656
657         switch (state) {
658         case NETDEV_POST_INIT:
659                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
660                 break;
661         case NETDEV_REGISTER:
662                 /*
663                  * NB: cannot take rdev->mtx here because this may be
664                  * called within code protected by it when interfaces
665                  * are added with nl80211.
666                  */
667                 mutex_init(&wdev->mtx);
668                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
669                 INIT_LIST_HEAD(&wdev->event_list);
670                 spin_lock_init(&wdev->event_lock);
671                 mutex_lock(&rdev->devlist_mtx);
672                 list_add(&wdev->list, &rdev->netdev_list);
673                 rdev->devlist_generation++;
674                 /* can only change netns with wiphy */
675                 dev->features |= NETIF_F_NETNS_LOCAL;
676
677                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
678                                       "phy80211")) {
679                         printk(KERN_ERR "wireless: failed to add phy80211 "
680                                 "symlink to netdev!\n");
681                 }
682                 wdev->netdev = dev;
683                 wdev->sme_state = CFG80211_SME_IDLE;
684                 mutex_unlock(&rdev->devlist_mtx);
685 #ifdef CONFIG_CFG80211_WEXT
686                 wdev->wext.default_key = -1;
687                 wdev->wext.default_mgmt_key = -1;
688                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
689                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
690                         wdev->wext.ps = true;
691                 else
692                         wdev->wext.ps = false;
693                 wdev->wext.ps_timeout = 100;
694                 if (rdev->ops->set_power_mgmt)
695                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
696                                                       wdev->wext.ps,
697                                                       wdev->wext.ps_timeout)) {
698                                 /* assume this means it's off */
699                                 wdev->wext.ps = false;
700                         }
701 #endif
702                 if (!dev->ethtool_ops)
703                         dev->ethtool_ops = &cfg80211_ethtool_ops;
704
705                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
706                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
707                         dev->priv_flags |= IFF_DONT_BRIDGE;
708                 break;
709         case NETDEV_GOING_DOWN:
710                 switch (wdev->iftype) {
711                 case NL80211_IFTYPE_ADHOC:
712                         cfg80211_leave_ibss(rdev, dev, true);
713                         break;
714                 case NL80211_IFTYPE_STATION:
715                         wdev_lock(wdev);
716 #ifdef CONFIG_CFG80211_WEXT
717                         kfree(wdev->wext.ie);
718                         wdev->wext.ie = NULL;
719                         wdev->wext.ie_len = 0;
720                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
721 #endif
722                         __cfg80211_disconnect(rdev, dev,
723                                               WLAN_REASON_DEAUTH_LEAVING, true);
724                         cfg80211_mlme_down(rdev, dev);
725                         wdev_unlock(wdev);
726                         break;
727                 default:
728                         break;
729                 }
730                 break;
731         case NETDEV_DOWN:
732                 dev_hold(dev);
733                 queue_work(cfg80211_wq, &wdev->cleanup_work);
734                 break;
735         case NETDEV_UP:
736                 /*
737                  * If we have a really quick DOWN/UP succession we may
738                  * have this work still pending ... cancel it and see
739                  * if it was pending, in which case we need to account
740                  * for some of the work it would have done.
741                  */
742                 if (cancel_work_sync(&wdev->cleanup_work)) {
743                         mutex_lock(&rdev->devlist_mtx);
744                         rdev->opencount--;
745                         mutex_unlock(&rdev->devlist_mtx);
746                         dev_put(dev);
747                 }
748                 cfg80211_lock_rdev(rdev);
749                 mutex_lock(&rdev->devlist_mtx);
750 #ifdef CONFIG_CFG80211_WEXT
751                 wdev_lock(wdev);
752                 switch (wdev->iftype) {
753                 case NL80211_IFTYPE_ADHOC:
754                         cfg80211_ibss_wext_join(rdev, wdev);
755                         break;
756                 case NL80211_IFTYPE_STATION:
757                         cfg80211_mgd_wext_connect(rdev, wdev);
758                         break;
759                 default:
760                         break;
761                 }
762                 wdev_unlock(wdev);
763 #endif
764                 rdev->opencount++;
765                 mutex_unlock(&rdev->devlist_mtx);
766                 cfg80211_unlock_rdev(rdev);
767                 break;
768         case NETDEV_UNREGISTER:
769                 /*
770                  * NB: cannot take rdev->mtx here because this may be
771                  * called within code protected by it when interfaces
772                  * are removed with nl80211.
773                  */
774                 mutex_lock(&rdev->devlist_mtx);
775                 /*
776                  * It is possible to get NETDEV_UNREGISTER
777                  * multiple times. To detect that, check
778                  * that the interface is still on the list
779                  * of registered interfaces, and only then
780                  * remove and clean it up.
781                  */
782                 if (!list_empty(&wdev->list)) {
783                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
784                         list_del_init(&wdev->list);
785                         rdev->devlist_generation++;
786 #ifdef CONFIG_CFG80211_WEXT
787                         kfree(wdev->wext.keys);
788 #endif
789                 }
790                 mutex_unlock(&rdev->devlist_mtx);
791                 break;
792         case NETDEV_PRE_UP:
793                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
794                         return notifier_from_errno(-EOPNOTSUPP);
795                 if (rfkill_blocked(rdev->rfkill))
796                         return notifier_from_errno(-ERFKILL);
797                 break;
798         }
799
800         return NOTIFY_DONE;
801 }
802
803 static struct notifier_block cfg80211_netdev_notifier = {
804         .notifier_call = cfg80211_netdev_notifier_call,
805 };
806
807 static void __net_exit cfg80211_pernet_exit(struct net *net)
808 {
809         struct cfg80211_registered_device *rdev;
810
811         rtnl_lock();
812         mutex_lock(&cfg80211_mutex);
813         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
814                 if (net_eq(wiphy_net(&rdev->wiphy), net))
815                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
816         }
817         mutex_unlock(&cfg80211_mutex);
818         rtnl_unlock();
819 }
820
821 static struct pernet_operations cfg80211_pernet_ops = {
822         .exit = cfg80211_pernet_exit,
823 };
824
825 static int __init cfg80211_init(void)
826 {
827         int err;
828
829         err = register_pernet_device(&cfg80211_pernet_ops);
830         if (err)
831                 goto out_fail_pernet;
832
833         err = wiphy_sysfs_init();
834         if (err)
835                 goto out_fail_sysfs;
836
837         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
838         if (err)
839                 goto out_fail_notifier;
840
841         err = nl80211_init();
842         if (err)
843                 goto out_fail_nl80211;
844
845         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
846
847         err = regulatory_init();
848         if (err)
849                 goto out_fail_reg;
850
851         cfg80211_wq = create_singlethread_workqueue("cfg80211");
852         if (!cfg80211_wq)
853                 goto out_fail_wq;
854
855         return 0;
856
857 out_fail_wq:
858         regulatory_exit();
859 out_fail_reg:
860         debugfs_remove(ieee80211_debugfs_dir);
861 out_fail_nl80211:
862         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
863 out_fail_notifier:
864         wiphy_sysfs_exit();
865 out_fail_sysfs:
866         unregister_pernet_device(&cfg80211_pernet_ops);
867 out_fail_pernet:
868         return err;
869 }
870 subsys_initcall(cfg80211_init);
871
872 static void cfg80211_exit(void)
873 {
874         debugfs_remove(ieee80211_debugfs_dir);
875         nl80211_exit();
876         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
877         wiphy_sysfs_exit();
878         regulatory_exit();
879         unregister_pernet_device(&cfg80211_pernet_ops);
880         destroy_workqueue(cfg80211_wq);
881 }
882 module_exit(cfg80211_exit);