headers: remove sched.h from interrupt.h
[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
26 /* name for sysfs, %d is appended */
27 #define PHY_NAME "phy"
28
29 MODULE_AUTHOR("Johannes Berg");
30 MODULE_LICENSE("GPL");
31 MODULE_DESCRIPTION("wireless configuration support");
32
33 /* RCU might be appropriate here since we usually
34  * only read the list, and that can happen quite
35  * often because we need to do it for each command */
36 LIST_HEAD(cfg80211_rdev_list);
37 int cfg80211_rdev_list_generation;
38
39 /*
40  * This is used to protect the cfg80211_rdev_list
41  */
42 DEFINE_MUTEX(cfg80211_mutex);
43
44 /* for debugfs */
45 static struct dentry *ieee80211_debugfs_dir;
46
47 /* requires cfg80211_mutex to be held! */
48 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
49 {
50         struct cfg80211_registered_device *result = NULL, *rdev;
51
52         if (!wiphy_idx_valid(wiphy_idx))
53                 return NULL;
54
55         assert_cfg80211_lock();
56
57         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
58                 if (rdev->wiphy_idx == wiphy_idx) {
59                         result = rdev;
60                         break;
61                 }
62         }
63
64         return result;
65 }
66
67 int get_wiphy_idx(struct wiphy *wiphy)
68 {
69         struct cfg80211_registered_device *rdev;
70         if (!wiphy)
71                 return WIPHY_IDX_STALE;
72         rdev = wiphy_to_dev(wiphy);
73         return rdev->wiphy_idx;
74 }
75
76 /* requires cfg80211_rdev_mutex to be held! */
77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
78 {
79         struct cfg80211_registered_device *rdev;
80
81         if (!wiphy_idx_valid(wiphy_idx))
82                 return NULL;
83
84         assert_cfg80211_lock();
85
86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
87         if (!rdev)
88                 return NULL;
89         return &rdev->wiphy;
90 }
91
92 /* requires cfg80211_mutex to be held! */
93 struct cfg80211_registered_device *
94 __cfg80211_rdev_from_info(struct genl_info *info)
95 {
96         int ifindex;
97         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
98         struct net_device *dev;
99         int err = -EINVAL;
100
101         assert_cfg80211_lock();
102
103         if (info->attrs[NL80211_ATTR_WIPHY]) {
104                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
105                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
106                 err = -ENODEV;
107         }
108
109         if (info->attrs[NL80211_ATTR_IFINDEX]) {
110                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
111                 dev = dev_get_by_index(genl_info_net(info), ifindex);
112                 if (dev) {
113                         if (dev->ieee80211_ptr)
114                                 byifidx =
115                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
116                         dev_put(dev);
117                 }
118                 err = -ENODEV;
119         }
120
121         if (bywiphyidx && byifidx) {
122                 if (bywiphyidx != byifidx)
123                         return ERR_PTR(-EINVAL);
124                 else
125                         return bywiphyidx; /* == byifidx */
126         }
127         if (bywiphyidx)
128                 return bywiphyidx;
129
130         if (byifidx)
131                 return byifidx;
132
133         return ERR_PTR(err);
134 }
135
136 struct cfg80211_registered_device *
137 cfg80211_get_dev_from_info(struct genl_info *info)
138 {
139         struct cfg80211_registered_device *rdev;
140
141         mutex_lock(&cfg80211_mutex);
142         rdev = __cfg80211_rdev_from_info(info);
143
144         /* if it is not an error we grab the lock on
145          * it to assure it won't be going away while
146          * we operate on it */
147         if (!IS_ERR(rdev))
148                 mutex_lock(&rdev->mtx);
149
150         mutex_unlock(&cfg80211_mutex);
151
152         return rdev;
153 }
154
155 struct cfg80211_registered_device *
156 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
157 {
158         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
159         struct net_device *dev;
160
161         mutex_lock(&cfg80211_mutex);
162         dev = dev_get_by_index(net, ifindex);
163         if (!dev)
164                 goto out;
165         if (dev->ieee80211_ptr) {
166                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
167                 mutex_lock(&rdev->mtx);
168         } else
169                 rdev = ERR_PTR(-ENODEV);
170         dev_put(dev);
171  out:
172         mutex_unlock(&cfg80211_mutex);
173         return rdev;
174 }
175
176 /* requires cfg80211_mutex to be held */
177 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
178                         char *newname)
179 {
180         struct cfg80211_registered_device *rdev2;
181         int wiphy_idx, taken = -1, result, digits;
182
183         assert_cfg80211_lock();
184
185         /* prohibit calling the thing phy%d when %d is not its number */
186         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
187         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
188                 /* count number of places needed to print wiphy_idx */
189                 digits = 1;
190                 while (wiphy_idx /= 10)
191                         digits++;
192                 /*
193                  * deny the name if it is phy<idx> where <idx> is printed
194                  * without leading zeroes. taken == strlen(newname) here
195                  */
196                 if (taken == strlen(PHY_NAME) + digits)
197                         return -EINVAL;
198         }
199
200
201         /* Ignore nop renames */
202         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
203                 return 0;
204
205         /* Ensure another device does not already have this name. */
206         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
207                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
208                         return -EINVAL;
209
210         result = device_rename(&rdev->wiphy.dev, newname);
211         if (result)
212                 return result;
213
214         if (rdev->wiphy.debugfsdir &&
215             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
216                             rdev->wiphy.debugfsdir,
217                             rdev->wiphy.debugfsdir->d_parent,
218                             newname))
219                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
220                        newname);
221
222         nl80211_notify_dev_rename(rdev);
223
224         return 0;
225 }
226
227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
228                           struct net *net)
229 {
230         struct wireless_dev *wdev;
231         int err = 0;
232
233         if (!rdev->wiphy.netnsok)
234                 return -EOPNOTSUPP;
235
236         list_for_each_entry(wdev, &rdev->netdev_list, list) {
237                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
238                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
239                 if (err)
240                         break;
241                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
242         }
243
244         if (err) {
245                 /* failed -- clean up to old netns */
246                 net = wiphy_net(&rdev->wiphy);
247
248                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
249                                                      list) {
250                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
251                         err = dev_change_net_namespace(wdev->netdev, net,
252                                                         "wlan%d");
253                         WARN_ON(err);
254                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
255                 }
256         }
257
258         wiphy_net_set(&rdev->wiphy, net);
259
260         return err;
261 }
262
263 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
264 {
265         struct cfg80211_registered_device *rdev = data;
266
267         rdev->ops->rfkill_poll(&rdev->wiphy);
268 }
269
270 static int cfg80211_rfkill_set_block(void *data, bool blocked)
271 {
272         struct cfg80211_registered_device *rdev = data;
273         struct wireless_dev *wdev;
274
275         if (!blocked)
276                 return 0;
277
278         rtnl_lock();
279         mutex_lock(&rdev->devlist_mtx);
280
281         list_for_each_entry(wdev, &rdev->netdev_list, list)
282                 dev_close(wdev->netdev);
283
284         mutex_unlock(&rdev->devlist_mtx);
285         rtnl_unlock();
286
287         return 0;
288 }
289
290 static void cfg80211_rfkill_sync_work(struct work_struct *work)
291 {
292         struct cfg80211_registered_device *rdev;
293
294         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
295         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
296 }
297
298 static void cfg80211_event_work(struct work_struct *work)
299 {
300         struct cfg80211_registered_device *rdev;
301
302         rdev = container_of(work, struct cfg80211_registered_device,
303                             event_work);
304
305         rtnl_lock();
306         cfg80211_lock_rdev(rdev);
307
308         cfg80211_process_rdev_events(rdev);
309         cfg80211_unlock_rdev(rdev);
310         rtnl_unlock();
311 }
312
313 /* exported functions */
314
315 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
316 {
317         static int wiphy_counter;
318
319         struct cfg80211_registered_device *rdev;
320         int alloc_size;
321
322         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
323         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
324         WARN_ON(ops->connect && !ops->disconnect);
325         WARN_ON(ops->join_ibss && !ops->leave_ibss);
326         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
327         WARN_ON(ops->add_station && !ops->del_station);
328         WARN_ON(ops->add_mpath && !ops->del_mpath);
329
330         alloc_size = sizeof(*rdev) + sizeof_priv;
331
332         rdev = kzalloc(alloc_size, GFP_KERNEL);
333         if (!rdev)
334                 return NULL;
335
336         rdev->ops = ops;
337
338         mutex_lock(&cfg80211_mutex);
339
340         rdev->wiphy_idx = wiphy_counter++;
341
342         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
343                 wiphy_counter--;
344                 mutex_unlock(&cfg80211_mutex);
345                 /* ugh, wrapped! */
346                 kfree(rdev);
347                 return NULL;
348         }
349
350         mutex_unlock(&cfg80211_mutex);
351
352         /* give it a proper name */
353         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
354
355         mutex_init(&rdev->mtx);
356         mutex_init(&rdev->devlist_mtx);
357         INIT_LIST_HEAD(&rdev->netdev_list);
358         spin_lock_init(&rdev->bss_lock);
359         INIT_LIST_HEAD(&rdev->bss_list);
360         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
361
362         device_initialize(&rdev->wiphy.dev);
363         rdev->wiphy.dev.class = &ieee80211_class;
364         rdev->wiphy.dev.platform_data = rdev;
365
366         rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
367
368         wiphy_net_set(&rdev->wiphy, &init_net);
369
370         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
371         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
372                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
373                                    &rdev->rfkill_ops, rdev);
374
375         if (!rdev->rfkill) {
376                 kfree(rdev);
377                 return NULL;
378         }
379
380         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
381         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
382         INIT_WORK(&rdev->event_work, cfg80211_event_work);
383
384         init_waitqueue_head(&rdev->dev_wait);
385
386         /*
387          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
388          * Fragmentation and RTS threshold are disabled by default with the
389          * special -1 value.
390          */
391         rdev->wiphy.retry_short = 7;
392         rdev->wiphy.retry_long = 4;
393         rdev->wiphy.frag_threshold = (u32) -1;
394         rdev->wiphy.rts_threshold = (u32) -1;
395
396         return &rdev->wiphy;
397 }
398 EXPORT_SYMBOL(wiphy_new);
399
400 int wiphy_register(struct wiphy *wiphy)
401 {
402         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
403         int res;
404         enum ieee80211_band band;
405         struct ieee80211_supported_band *sband;
406         bool have_band = false;
407         int i;
408         u16 ifmodes = wiphy->interface_modes;
409
410         /* sanity check ifmodes */
411         WARN_ON(!ifmodes);
412         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
413         if (WARN_ON(ifmodes != wiphy->interface_modes))
414                 wiphy->interface_modes = ifmodes;
415
416         /* sanity check supported bands/channels */
417         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
418                 sband = wiphy->bands[band];
419                 if (!sband)
420                         continue;
421
422                 sband->band = band;
423
424                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
425                         return -EINVAL;
426
427                 /*
428                  * Since we use a u32 for rate bitmaps in
429                  * ieee80211_get_response_rate, we cannot
430                  * have more than 32 legacy rates.
431                  */
432                 if (WARN_ON(sband->n_bitrates > 32))
433                         return -EINVAL;
434
435                 for (i = 0; i < sband->n_channels; i++) {
436                         sband->channels[i].orig_flags =
437                                 sband->channels[i].flags;
438                         sband->channels[i].orig_mag =
439                                 sband->channels[i].max_antenna_gain;
440                         sband->channels[i].orig_mpwr =
441                                 sband->channels[i].max_power;
442                         sband->channels[i].band = band;
443                 }
444
445                 have_band = true;
446         }
447
448         if (!have_band) {
449                 WARN_ON(1);
450                 return -EINVAL;
451         }
452
453         /* check and set up bitrates */
454         ieee80211_set_bitrate_flags(wiphy);
455
456         res = device_add(&rdev->wiphy.dev);
457         if (res)
458                 return res;
459
460         res = rfkill_register(rdev->rfkill);
461         if (res)
462                 goto out_rm_dev;
463
464         mutex_lock(&cfg80211_mutex);
465
466         /* set up regulatory info */
467         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
468
469         list_add(&rdev->list, &cfg80211_rdev_list);
470         cfg80211_rdev_list_generation++;
471
472         mutex_unlock(&cfg80211_mutex);
473
474         /* add to debugfs */
475         rdev->wiphy.debugfsdir =
476                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
477                                    ieee80211_debugfs_dir);
478         if (IS_ERR(rdev->wiphy.debugfsdir))
479                 rdev->wiphy.debugfsdir = NULL;
480
481         if (wiphy->custom_regulatory) {
482                 struct regulatory_request request;
483
484                 request.wiphy_idx = get_wiphy_idx(wiphy);
485                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
486                 request.alpha2[0] = '9';
487                 request.alpha2[1] = '9';
488
489                 nl80211_send_reg_change_event(&request);
490         }
491
492         cfg80211_debugfs_rdev_add(rdev);
493
494         return 0;
495
496  out_rm_dev:
497         device_del(&rdev->wiphy.dev);
498         return res;
499 }
500 EXPORT_SYMBOL(wiphy_register);
501
502 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
503 {
504         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
505
506         if (!rdev->ops->rfkill_poll)
507                 return;
508         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
509         rfkill_resume_polling(rdev->rfkill);
510 }
511 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
512
513 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
514 {
515         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
516
517         rfkill_pause_polling(rdev->rfkill);
518 }
519 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
520
521 void wiphy_unregister(struct wiphy *wiphy)
522 {
523         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
524
525         rfkill_unregister(rdev->rfkill);
526
527         /* protect the device list */
528         mutex_lock(&cfg80211_mutex);
529
530         wait_event(rdev->dev_wait, ({
531                 int __count;
532                 mutex_lock(&rdev->devlist_mtx);
533                 __count = rdev->opencount;
534                 mutex_unlock(&rdev->devlist_mtx);
535                 __count == 0;}));
536
537         mutex_lock(&rdev->devlist_mtx);
538         BUG_ON(!list_empty(&rdev->netdev_list));
539         mutex_unlock(&rdev->devlist_mtx);
540
541         /*
542          * First remove the hardware from everywhere, this makes
543          * it impossible to find from userspace.
544          */
545         cfg80211_debugfs_rdev_del(rdev);
546         list_del(&rdev->list);
547
548         /*
549          * Try to grab rdev->mtx. If a command is still in progress,
550          * hopefully the driver will refuse it since it's tearing
551          * down the device already. We wait for this command to complete
552          * before unlinking the item from the list.
553          * Note: as codified by the BUG_ON above we cannot get here if
554          * a virtual interface is still present. Hence, we can only get
555          * to lock contention here if userspace issues a command that
556          * identified the hardware by wiphy index.
557          */
558         cfg80211_lock_rdev(rdev);
559         /* nothing */
560         cfg80211_unlock_rdev(rdev);
561
562         /* If this device got a regulatory hint tell core its
563          * free to listen now to a new shiny device regulatory hint */
564         reg_device_remove(wiphy);
565
566         cfg80211_rdev_list_generation++;
567         device_del(&rdev->wiphy.dev);
568         debugfs_remove(rdev->wiphy.debugfsdir);
569
570         mutex_unlock(&cfg80211_mutex);
571
572         flush_work(&rdev->scan_done_wk);
573         cancel_work_sync(&rdev->conn_work);
574         flush_work(&rdev->event_work);
575 }
576 EXPORT_SYMBOL(wiphy_unregister);
577
578 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
579 {
580         struct cfg80211_internal_bss *scan, *tmp;
581         rfkill_destroy(rdev->rfkill);
582         mutex_destroy(&rdev->mtx);
583         mutex_destroy(&rdev->devlist_mtx);
584         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
585                 cfg80211_put_bss(&scan->pub);
586         kfree(rdev);
587 }
588
589 void wiphy_free(struct wiphy *wiphy)
590 {
591         put_device(&wiphy->dev);
592 }
593 EXPORT_SYMBOL(wiphy_free);
594
595 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
596 {
597         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
598
599         if (rfkill_set_hw_state(rdev->rfkill, blocked))
600                 schedule_work(&rdev->rfkill_sync);
601 }
602 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
603
604 static void wdev_cleanup_work(struct work_struct *work)
605 {
606         struct wireless_dev *wdev;
607         struct cfg80211_registered_device *rdev;
608
609         wdev = container_of(work, struct wireless_dev, cleanup_work);
610         rdev = wiphy_to_dev(wdev->wiphy);
611
612         cfg80211_lock_rdev(rdev);
613
614         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
615                 rdev->scan_req->aborted = true;
616                 ___cfg80211_scan_done(rdev, true);
617         }
618
619         cfg80211_unlock_rdev(rdev);
620
621         mutex_lock(&rdev->devlist_mtx);
622         rdev->opencount--;
623         mutex_unlock(&rdev->devlist_mtx);
624         wake_up(&rdev->dev_wait);
625
626         dev_put(wdev->netdev);
627 }
628
629 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
630                                          unsigned long state,
631                                          void *ndev)
632 {
633         struct net_device *dev = ndev;
634         struct wireless_dev *wdev = dev->ieee80211_ptr;
635         struct cfg80211_registered_device *rdev;
636
637         if (!wdev)
638                 return NOTIFY_DONE;
639
640         rdev = wiphy_to_dev(wdev->wiphy);
641
642         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
643
644         switch (state) {
645         case NETDEV_REGISTER:
646                 /*
647                  * NB: cannot take rdev->mtx here because this may be
648                  * called within code protected by it when interfaces
649                  * are added with nl80211.
650                  */
651                 mutex_init(&wdev->mtx);
652                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
653                 INIT_LIST_HEAD(&wdev->event_list);
654                 spin_lock_init(&wdev->event_lock);
655                 mutex_lock(&rdev->devlist_mtx);
656                 list_add(&wdev->list, &rdev->netdev_list);
657                 rdev->devlist_generation++;
658                 /* can only change netns with wiphy */
659                 dev->features |= NETIF_F_NETNS_LOCAL;
660
661                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
662                                       "phy80211")) {
663                         printk(KERN_ERR "wireless: failed to add phy80211 "
664                                 "symlink to netdev!\n");
665                 }
666                 wdev->netdev = dev;
667                 wdev->sme_state = CFG80211_SME_IDLE;
668                 mutex_unlock(&rdev->devlist_mtx);
669 #ifdef CONFIG_WIRELESS_EXT
670                 if (!dev->wireless_handlers)
671                         dev->wireless_handlers = &cfg80211_wext_handler;
672                 wdev->wext.default_key = -1;
673                 wdev->wext.default_mgmt_key = -1;
674                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
675                 wdev->wext.ps = wdev->wiphy->ps_default;
676                 wdev->wext.ps_timeout = 100;
677                 if (rdev->ops->set_power_mgmt)
678                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
679                                                       wdev->wext.ps,
680                                                       wdev->wext.ps_timeout)) {
681                                 /* assume this means it's off */
682                                 wdev->wext.ps = false;
683                         }
684 #endif
685                 break;
686         case NETDEV_GOING_DOWN:
687                 switch (wdev->iftype) {
688                 case NL80211_IFTYPE_ADHOC:
689                         cfg80211_leave_ibss(rdev, dev, true);
690                         break;
691                 case NL80211_IFTYPE_STATION:
692                         wdev_lock(wdev);
693 #ifdef CONFIG_WIRELESS_EXT
694                         kfree(wdev->wext.ie);
695                         wdev->wext.ie = NULL;
696                         wdev->wext.ie_len = 0;
697                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
698 #endif
699                         __cfg80211_disconnect(rdev, dev,
700                                               WLAN_REASON_DEAUTH_LEAVING, true);
701                         cfg80211_mlme_down(rdev, dev);
702                         wdev_unlock(wdev);
703                         break;
704                 default:
705                         break;
706                 }
707                 break;
708         case NETDEV_DOWN:
709                 dev_hold(dev);
710                 schedule_work(&wdev->cleanup_work);
711                 break;
712         case NETDEV_UP:
713                 /*
714                  * If we have a really quick DOWN/UP succession we may
715                  * have this work still pending ... cancel it and see
716                  * if it was pending, in which case we need to account
717                  * for some of the work it would have done.
718                  */
719                 if (cancel_work_sync(&wdev->cleanup_work)) {
720                         mutex_lock(&rdev->devlist_mtx);
721                         rdev->opencount--;
722                         mutex_unlock(&rdev->devlist_mtx);
723                         dev_put(dev);
724                 }
725 #ifdef CONFIG_WIRELESS_EXT
726                 cfg80211_lock_rdev(rdev);
727                 mutex_lock(&rdev->devlist_mtx);
728                 wdev_lock(wdev);
729                 switch (wdev->iftype) {
730                 case NL80211_IFTYPE_ADHOC:
731                         cfg80211_ibss_wext_join(rdev, wdev);
732                         break;
733                 case NL80211_IFTYPE_STATION:
734                         cfg80211_mgd_wext_connect(rdev, wdev);
735                         break;
736                 default:
737                         break;
738                 }
739                 wdev_unlock(wdev);
740                 rdev->opencount++;
741                 mutex_unlock(&rdev->devlist_mtx);
742                 cfg80211_unlock_rdev(rdev);
743 #endif
744                 break;
745         case NETDEV_UNREGISTER:
746                 /*
747                  * NB: cannot take rdev->mtx here because this may be
748                  * called within code protected by it when interfaces
749                  * are removed with nl80211.
750                  */
751                 mutex_lock(&rdev->devlist_mtx);
752                 /*
753                  * It is possible to get NETDEV_UNREGISTER
754                  * multiple times. To detect that, check
755                  * that the interface is still on the list
756                  * of registered interfaces, and only then
757                  * remove and clean it up.
758                  */
759                 if (!list_empty(&wdev->list)) {
760                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
761                         list_del_init(&wdev->list);
762                         rdev->devlist_generation++;
763 #ifdef CONFIG_WIRELESS_EXT
764                         kfree(wdev->wext.keys);
765 #endif
766                 }
767                 mutex_unlock(&rdev->devlist_mtx);
768                 break;
769         case NETDEV_PRE_UP:
770                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
771                         return notifier_from_errno(-EOPNOTSUPP);
772                 if (rfkill_blocked(rdev->rfkill))
773                         return notifier_from_errno(-ERFKILL);
774                 break;
775         }
776
777         return NOTIFY_DONE;
778 }
779
780 static struct notifier_block cfg80211_netdev_notifier = {
781         .notifier_call = cfg80211_netdev_notifier_call,
782 };
783
784 static void __net_exit cfg80211_pernet_exit(struct net *net)
785 {
786         struct cfg80211_registered_device *rdev;
787
788         rtnl_lock();
789         mutex_lock(&cfg80211_mutex);
790         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
791                 if (net_eq(wiphy_net(&rdev->wiphy), net))
792                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
793         }
794         mutex_unlock(&cfg80211_mutex);
795         rtnl_unlock();
796 }
797
798 static struct pernet_operations cfg80211_pernet_ops = {
799         .exit = cfg80211_pernet_exit,
800 };
801
802 static int __init cfg80211_init(void)
803 {
804         int err;
805
806         err = register_pernet_device(&cfg80211_pernet_ops);
807         if (err)
808                 goto out_fail_pernet;
809
810         err = wiphy_sysfs_init();
811         if (err)
812                 goto out_fail_sysfs;
813
814         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
815         if (err)
816                 goto out_fail_notifier;
817
818         err = nl80211_init();
819         if (err)
820                 goto out_fail_nl80211;
821
822         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
823
824         err = regulatory_init();
825         if (err)
826                 goto out_fail_reg;
827
828         return 0;
829
830 out_fail_reg:
831         debugfs_remove(ieee80211_debugfs_dir);
832 out_fail_nl80211:
833         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
834 out_fail_notifier:
835         wiphy_sysfs_exit();
836 out_fail_sysfs:
837         unregister_pernet_device(&cfg80211_pernet_ops);
838 out_fail_pernet:
839         return err;
840 }
841 subsys_initcall(cfg80211_init);
842
843 static void cfg80211_exit(void)
844 {
845         debugfs_remove(ieee80211_debugfs_dir);
846         nl80211_exit();
847         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
848         wiphy_sysfs_exit();
849         regulatory_exit();
850         unregister_pernet_device(&cfg80211_pernet_ops);
851 }
852 module_exit(cfg80211_exit);