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