cfg80211: decouple regulatory variables from cfg80211_mutex
[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/rtnetlink.h>
16 #include <net/genetlink.h>
17 #include <net/cfg80211.h>
18 #include "nl80211.h"
19 #include "core.h"
20 #include "sysfs.h"
21 #include "debugfs.h"
22 #include "wext-compat.h"
23
24 /* name for sysfs, %d is appended */
25 #define PHY_NAME "phy"
26
27 MODULE_AUTHOR("Johannes Berg");
28 MODULE_LICENSE("GPL");
29 MODULE_DESCRIPTION("wireless configuration support");
30
31 /* RCU might be appropriate here since we usually
32  * only read the list, and that can happen quite
33  * often because we need to do it for each command */
34 LIST_HEAD(cfg80211_rdev_list);
35
36 /*
37  * This is used to protect the cfg80211_rdev_list
38  */
39 DEFINE_MUTEX(cfg80211_mutex);
40
41 /* for debugfs */
42 static struct dentry *ieee80211_debugfs_dir;
43
44 /* requires cfg80211_mutex to be held! */
45 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
46 {
47         struct cfg80211_registered_device *result = NULL, *rdev;
48
49         if (!wiphy_idx_valid(wiphy_idx))
50                 return NULL;
51
52         assert_cfg80211_lock();
53
54         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
55                 if (rdev->wiphy_idx == wiphy_idx) {
56                         result = rdev;
57                         break;
58                 }
59         }
60
61         return result;
62 }
63
64 int get_wiphy_idx(struct wiphy *wiphy)
65 {
66         struct cfg80211_registered_device *rdev;
67         if (!wiphy)
68                 return WIPHY_IDX_STALE;
69         rdev = wiphy_to_dev(wiphy);
70         return rdev->wiphy_idx;
71 }
72
73 /* requires cfg80211_rdev_mutex to be held! */
74 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
75 {
76         struct cfg80211_registered_device *rdev;
77
78         if (!wiphy_idx_valid(wiphy_idx))
79                 return NULL;
80
81         assert_cfg80211_lock();
82
83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
84         if (!rdev)
85                 return NULL;
86         return &rdev->wiphy;
87 }
88
89 /* requires cfg80211_mutex to be held! */
90 struct cfg80211_registered_device *
91 __cfg80211_rdev_from_info(struct genl_info *info)
92 {
93         int ifindex;
94         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
95         struct net_device *dev;
96         int err = -EINVAL;
97
98         assert_cfg80211_lock();
99
100         if (info->attrs[NL80211_ATTR_WIPHY]) {
101                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
102                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
103                 err = -ENODEV;
104         }
105
106         if (info->attrs[NL80211_ATTR_IFINDEX]) {
107                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
108                 dev = dev_get_by_index(genl_info_net(info), ifindex);
109                 if (dev) {
110                         if (dev->ieee80211_ptr)
111                                 byifidx =
112                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
113                         dev_put(dev);
114                 }
115                 err = -ENODEV;
116         }
117
118         if (bywiphyidx && byifidx) {
119                 if (bywiphyidx != byifidx)
120                         return ERR_PTR(-EINVAL);
121                 else
122                         return bywiphyidx; /* == byifidx */
123         }
124         if (bywiphyidx)
125                 return bywiphyidx;
126
127         if (byifidx)
128                 return byifidx;
129
130         return ERR_PTR(err);
131 }
132
133 struct cfg80211_registered_device *
134 cfg80211_get_dev_from_info(struct genl_info *info)
135 {
136         struct cfg80211_registered_device *rdev;
137
138         mutex_lock(&cfg80211_mutex);
139         rdev = __cfg80211_rdev_from_info(info);
140
141         /* if it is not an error we grab the lock on
142          * it to assure it won't be going away while
143          * we operate on it */
144         if (!IS_ERR(rdev))
145                 mutex_lock(&rdev->mtx);
146
147         mutex_unlock(&cfg80211_mutex);
148
149         return rdev;
150 }
151
152 struct cfg80211_registered_device *
153 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
154 {
155         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
156         struct net_device *dev;
157
158         mutex_lock(&cfg80211_mutex);
159         dev = dev_get_by_index(net, ifindex);
160         if (!dev)
161                 goto out;
162         if (dev->ieee80211_ptr) {
163                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
164                 mutex_lock(&rdev->mtx);
165         } else
166                 rdev = ERR_PTR(-ENODEV);
167         dev_put(dev);
168  out:
169         mutex_unlock(&cfg80211_mutex);
170         return rdev;
171 }
172
173 /* requires cfg80211_mutex to be held */
174 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
175                         char *newname)
176 {
177         struct cfg80211_registered_device *rdev2;
178         int wiphy_idx, taken = -1, result, digits;
179
180         assert_cfg80211_lock();
181
182         /* prohibit calling the thing phy%d when %d is not its number */
183         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
184         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
185                 /* count number of places needed to print wiphy_idx */
186                 digits = 1;
187                 while (wiphy_idx /= 10)
188                         digits++;
189                 /*
190                  * deny the name if it is phy<idx> where <idx> is printed
191                  * without leading zeroes. taken == strlen(newname) here
192                  */
193                 if (taken == strlen(PHY_NAME) + digits)
194                         return -EINVAL;
195         }
196
197
198         /* Ignore nop renames */
199         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
200                 return 0;
201
202         /* Ensure another device does not already have this name. */
203         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
204                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
205                         return -EINVAL;
206
207         result = device_rename(&rdev->wiphy.dev, newname);
208         if (result)
209                 return result;
210
211         if (rdev->wiphy.debugfsdir &&
212             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
213                             rdev->wiphy.debugfsdir,
214                             rdev->wiphy.debugfsdir->d_parent,
215                             newname))
216                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
217                        newname);
218
219         nl80211_notify_dev_rename(rdev);
220
221         return 0;
222 }
223
224 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
225                           struct net *net)
226 {
227         struct wireless_dev *wdev;
228         int err = 0;
229
230         if (!rdev->wiphy.netnsok)
231                 return -EOPNOTSUPP;
232
233         list_for_each_entry(wdev, &rdev->netdev_list, list) {
234                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
235                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
236                 if (err)
237                         break;
238                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
239         }
240
241         if (err) {
242                 /* failed -- clean up to old netns */
243                 net = wiphy_net(&rdev->wiphy);
244
245                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
246                                                      list) {
247                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
248                         err = dev_change_net_namespace(wdev->netdev, net,
249                                                         "wlan%d");
250                         WARN_ON(err);
251                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
252                 }
253         }
254
255         wiphy_net_set(&rdev->wiphy, net);
256
257         return err;
258 }
259
260 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
261 {
262         struct cfg80211_registered_device *rdev = data;
263
264         rdev->ops->rfkill_poll(&rdev->wiphy);
265 }
266
267 static int cfg80211_rfkill_set_block(void *data, bool blocked)
268 {
269         struct cfg80211_registered_device *rdev = data;
270         struct wireless_dev *wdev;
271
272         if (!blocked)
273                 return 0;
274
275         rtnl_lock();
276         mutex_lock(&rdev->devlist_mtx);
277
278         list_for_each_entry(wdev, &rdev->netdev_list, list)
279                 dev_close(wdev->netdev);
280
281         mutex_unlock(&rdev->devlist_mtx);
282         rtnl_unlock();
283
284         return 0;
285 }
286
287 static void cfg80211_rfkill_sync_work(struct work_struct *work)
288 {
289         struct cfg80211_registered_device *rdev;
290
291         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
292         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
293 }
294
295 static void cfg80211_process_events(struct wireless_dev *wdev)
296 {
297         struct cfg80211_event *ev;
298         unsigned long flags;
299
300         spin_lock_irqsave(&wdev->event_lock, flags);
301         while (!list_empty(&wdev->event_list)) {
302                 ev = list_first_entry(&wdev->event_list,
303                                       struct cfg80211_event, list);
304                 list_del(&ev->list);
305                 spin_unlock_irqrestore(&wdev->event_lock, flags);
306
307                 wdev_lock(wdev);
308                 switch (ev->type) {
309                 case EVENT_CONNECT_RESULT:
310                         __cfg80211_connect_result(
311                                 wdev->netdev, ev->cr.bssid,
312                                 ev->cr.req_ie, ev->cr.req_ie_len,
313                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
314                                 ev->cr.status,
315                                 ev->cr.status == WLAN_STATUS_SUCCESS,
316                                 NULL);
317                         break;
318                 case EVENT_ROAMED:
319                         __cfg80211_roamed(wdev, ev->rm.bssid,
320                                           ev->rm.req_ie, ev->rm.req_ie_len,
321                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
322                         break;
323                 case EVENT_DISCONNECTED:
324                         __cfg80211_disconnected(wdev->netdev,
325                                                 ev->dc.ie, ev->dc.ie_len,
326                                                 ev->dc.reason, true);
327                         break;
328                 case EVENT_IBSS_JOINED:
329                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
330                         break;
331                 }
332                 wdev_unlock(wdev);
333
334                 kfree(ev);
335
336                 spin_lock_irqsave(&wdev->event_lock, flags);
337         }
338         spin_unlock_irqrestore(&wdev->event_lock, flags);
339 }
340
341 static void cfg80211_event_work(struct work_struct *work)
342 {
343         struct cfg80211_registered_device *rdev;
344         struct wireless_dev *wdev;
345
346         rdev = container_of(work, struct cfg80211_registered_device,
347                             event_work);
348
349         rtnl_lock();
350         cfg80211_lock_rdev(rdev);
351         mutex_lock(&rdev->devlist_mtx);
352
353         list_for_each_entry(wdev, &rdev->netdev_list, list)
354                 cfg80211_process_events(wdev);
355
356         mutex_unlock(&rdev->devlist_mtx);
357         cfg80211_unlock_rdev(rdev);
358         rtnl_unlock();
359 }
360
361 /* exported functions */
362
363 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
364 {
365         static int wiphy_counter;
366
367         struct cfg80211_registered_device *rdev;
368         int alloc_size;
369
370         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
371         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
372         WARN_ON(ops->connect && !ops->disconnect);
373         WARN_ON(ops->join_ibss && !ops->leave_ibss);
374         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
375         WARN_ON(ops->add_station && !ops->del_station);
376         WARN_ON(ops->add_mpath && !ops->del_mpath);
377
378         alloc_size = sizeof(*rdev) + sizeof_priv;
379
380         rdev = kzalloc(alloc_size, GFP_KERNEL);
381         if (!rdev)
382                 return NULL;
383
384         rdev->ops = ops;
385
386         mutex_lock(&cfg80211_mutex);
387
388         rdev->wiphy_idx = wiphy_counter++;
389
390         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
391                 wiphy_counter--;
392                 mutex_unlock(&cfg80211_mutex);
393                 /* ugh, wrapped! */
394                 kfree(rdev);
395                 return NULL;
396         }
397
398         mutex_unlock(&cfg80211_mutex);
399
400         /* give it a proper name */
401         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
402
403         mutex_init(&rdev->mtx);
404         mutex_init(&rdev->devlist_mtx);
405         INIT_LIST_HEAD(&rdev->netdev_list);
406         spin_lock_init(&rdev->bss_lock);
407         INIT_LIST_HEAD(&rdev->bss_list);
408         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
409
410         device_initialize(&rdev->wiphy.dev);
411         rdev->wiphy.dev.class = &ieee80211_class;
412         rdev->wiphy.dev.platform_data = rdev;
413
414         wiphy_net_set(&rdev->wiphy, &init_net);
415
416         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
417         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
418                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
419                                    &rdev->rfkill_ops, rdev);
420
421         if (!rdev->rfkill) {
422                 kfree(rdev);
423                 return NULL;
424         }
425
426         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
427         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
428         INIT_WORK(&rdev->event_work, cfg80211_event_work);
429
430         /*
431          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
432          * Fragmentation and RTS threshold are disabled by default with the
433          * special -1 value.
434          */
435         rdev->wiphy.retry_short = 7;
436         rdev->wiphy.retry_long = 4;
437         rdev->wiphy.frag_threshold = (u32) -1;
438         rdev->wiphy.rts_threshold = (u32) -1;
439
440         return &rdev->wiphy;
441 }
442 EXPORT_SYMBOL(wiphy_new);
443
444 int wiphy_register(struct wiphy *wiphy)
445 {
446         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
447         int res;
448         enum ieee80211_band band;
449         struct ieee80211_supported_band *sband;
450         bool have_band = false;
451         int i;
452         u16 ifmodes = wiphy->interface_modes;
453
454         /* sanity check ifmodes */
455         WARN_ON(!ifmodes);
456         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
457         if (WARN_ON(ifmodes != wiphy->interface_modes))
458                 wiphy->interface_modes = ifmodes;
459
460         /* sanity check supported bands/channels */
461         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
462                 sband = wiphy->bands[band];
463                 if (!sband)
464                         continue;
465
466                 sband->band = band;
467
468                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
469                         return -EINVAL;
470
471                 /*
472                  * Since we use a u32 for rate bitmaps in
473                  * ieee80211_get_response_rate, we cannot
474                  * have more than 32 legacy rates.
475                  */
476                 if (WARN_ON(sband->n_bitrates > 32))
477                         return -EINVAL;
478
479                 for (i = 0; i < sband->n_channels; i++) {
480                         sband->channels[i].orig_flags =
481                                 sband->channels[i].flags;
482                         sband->channels[i].orig_mag =
483                                 sband->channels[i].max_antenna_gain;
484                         sband->channels[i].orig_mpwr =
485                                 sband->channels[i].max_power;
486                         sband->channels[i].band = band;
487                 }
488
489                 have_band = true;
490         }
491
492         if (!have_band) {
493                 WARN_ON(1);
494                 return -EINVAL;
495         }
496
497         /* check and set up bitrates */
498         ieee80211_set_bitrate_flags(wiphy);
499
500         res = device_add(&rdev->wiphy.dev);
501         if (res)
502                 return res;
503
504         res = rfkill_register(rdev->rfkill);
505         if (res)
506                 goto out_rm_dev;
507
508         mutex_lock(&cfg80211_mutex);
509
510         /* set up regulatory info */
511         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
512
513         list_add(&rdev->list, &cfg80211_rdev_list);
514
515         mutex_unlock(&cfg80211_mutex);
516
517         /* add to debugfs */
518         rdev->wiphy.debugfsdir =
519                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
520                                    ieee80211_debugfs_dir);
521         if (IS_ERR(rdev->wiphy.debugfsdir))
522                 rdev->wiphy.debugfsdir = NULL;
523
524         if (wiphy->custom_regulatory) {
525                 struct regulatory_request request;
526
527                 request.wiphy_idx = get_wiphy_idx(wiphy);
528                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
529                 request.alpha2[0] = '9';
530                 request.alpha2[1] = '9';
531
532                 nl80211_send_reg_change_event(&request);
533         }
534
535         cfg80211_debugfs_rdev_add(rdev);
536
537         return 0;
538
539  out_rm_dev:
540         device_del(&rdev->wiphy.dev);
541         return res;
542 }
543 EXPORT_SYMBOL(wiphy_register);
544
545 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
546 {
547         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
548
549         if (!rdev->ops->rfkill_poll)
550                 return;
551         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
552         rfkill_resume_polling(rdev->rfkill);
553 }
554 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
555
556 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
557 {
558         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
559
560         rfkill_pause_polling(rdev->rfkill);
561 }
562 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
563
564 void wiphy_unregister(struct wiphy *wiphy)
565 {
566         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
567
568         rfkill_unregister(rdev->rfkill);
569
570         /* protect the device list */
571         mutex_lock(&cfg80211_mutex);
572
573         BUG_ON(!list_empty(&rdev->netdev_list));
574
575         /*
576          * Try to grab rdev->mtx. If a command is still in progress,
577          * hopefully the driver will refuse it since it's tearing
578          * down the device already. We wait for this command to complete
579          * before unlinking the item from the list.
580          * Note: as codified by the BUG_ON above we cannot get here if
581          * a virtual interface is still associated. Hence, we can only
582          * get to lock contention here if userspace issues a command
583          * that identified the hardware by wiphy index.
584          */
585         mutex_lock(&rdev->mtx);
586         /* unlock again before freeing */
587         mutex_unlock(&rdev->mtx);
588
589         cfg80211_debugfs_rdev_del(rdev);
590
591         /* If this device got a regulatory hint tell core its
592          * free to listen now to a new shiny device regulatory hint */
593         reg_device_remove(wiphy);
594
595         list_del(&rdev->list);
596         device_del(&rdev->wiphy.dev);
597         debugfs_remove(rdev->wiphy.debugfsdir);
598
599         mutex_unlock(&cfg80211_mutex);
600
601         cancel_work_sync(&rdev->conn_work);
602         cancel_work_sync(&rdev->scan_done_wk);
603         kfree(rdev->scan_req);
604         flush_work(&rdev->event_work);
605 }
606 EXPORT_SYMBOL(wiphy_unregister);
607
608 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
609 {
610         struct cfg80211_internal_bss *scan, *tmp;
611         rfkill_destroy(rdev->rfkill);
612         mutex_destroy(&rdev->mtx);
613         mutex_destroy(&rdev->devlist_mtx);
614         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
615                 cfg80211_put_bss(&scan->pub);
616         kfree(rdev);
617 }
618
619 void wiphy_free(struct wiphy *wiphy)
620 {
621         put_device(&wiphy->dev);
622 }
623 EXPORT_SYMBOL(wiphy_free);
624
625 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
626 {
627         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
628
629         if (rfkill_set_hw_state(rdev->rfkill, blocked))
630                 schedule_work(&rdev->rfkill_sync);
631 }
632 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
633
634 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
635                                          unsigned long state,
636                                          void *ndev)
637 {
638         struct net_device *dev = ndev;
639         struct wireless_dev *wdev = dev->ieee80211_ptr;
640         struct cfg80211_registered_device *rdev;
641
642         if (!wdev)
643                 return NOTIFY_DONE;
644
645         rdev = wiphy_to_dev(wdev->wiphy);
646
647         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
648
649         switch (state) {
650         case NETDEV_REGISTER:
651                 mutex_init(&wdev->mtx);
652                 INIT_LIST_HEAD(&wdev->event_list);
653                 spin_lock_init(&wdev->event_lock);
654                 mutex_lock(&rdev->devlist_mtx);
655                 list_add(&wdev->list, &rdev->netdev_list);
656                 /* can only change netns with wiphy */
657                 dev->features |= NETIF_F_NETNS_LOCAL;
658
659                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
660                                       "phy80211")) {
661                         printk(KERN_ERR "wireless: failed to add phy80211 "
662                                 "symlink to netdev!\n");
663                 }
664                 wdev->netdev = dev;
665                 wdev->sme_state = CFG80211_SME_IDLE;
666                 mutex_unlock(&rdev->devlist_mtx);
667 #ifdef CONFIG_WIRELESS_EXT
668                 if (!dev->wireless_handlers)
669                         dev->wireless_handlers = &cfg80211_wext_handler;
670                 wdev->wext.default_key = -1;
671                 wdev->wext.default_mgmt_key = -1;
672                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
673                 wdev->wext.ps = CONFIG_CFG80211_DEFAULT_PS_VALUE;
674                 wdev->wext.ps_timeout = 500;
675                 if (rdev->ops->set_power_mgmt)
676                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
677                                                       wdev->wext.ps,
678                                                       wdev->wext.ps_timeout)) {
679                                 /* assume this means it's off */
680                                 wdev->wext.ps = false;
681                         }
682 #endif
683                 break;
684         case NETDEV_GOING_DOWN:
685                 switch (wdev->iftype) {
686                 case NL80211_IFTYPE_ADHOC:
687                         cfg80211_leave_ibss(rdev, dev, true);
688                         break;
689                 case NL80211_IFTYPE_STATION:
690                         wdev_lock(wdev);
691 #ifdef CONFIG_WIRELESS_EXT
692                         kfree(wdev->wext.ie);
693                         wdev->wext.ie = NULL;
694                         wdev->wext.ie_len = 0;
695                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
696 #endif
697                         __cfg80211_disconnect(rdev, dev,
698                                               WLAN_REASON_DEAUTH_LEAVING, true);
699                         cfg80211_mlme_down(rdev, dev);
700                         wdev_unlock(wdev);
701                         break;
702                 default:
703                         break;
704                 }
705                 break;
706         case NETDEV_UP:
707 #ifdef CONFIG_WIRELESS_EXT
708                 cfg80211_lock_rdev(rdev);
709                 wdev_lock(wdev);
710                 switch (wdev->iftype) {
711                 case NL80211_IFTYPE_ADHOC:
712                         cfg80211_ibss_wext_join(rdev, wdev);
713                         break;
714                 case NL80211_IFTYPE_STATION:
715                         cfg80211_mgd_wext_connect(rdev, wdev);
716                         break;
717                 default:
718                         break;
719                 }
720                 wdev_unlock(wdev);
721                 cfg80211_unlock_rdev(rdev);
722 #endif
723                 break;
724         case NETDEV_UNREGISTER:
725                 mutex_lock(&rdev->devlist_mtx);
726                 /*
727                  * It is possible to get NETDEV_UNREGISTER
728                  * multiple times. To detect that, check
729                  * that the interface is still on the list
730                  * of registered interfaces, and only then
731                  * remove and clean it up.
732                  */
733                 if (!list_empty(&wdev->list)) {
734                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
735                         list_del_init(&wdev->list);
736                         mutex_destroy(&wdev->mtx);
737 #ifdef CONFIG_WIRELESS_EXT
738                         kfree(wdev->wext.keys);
739 #endif
740                 }
741                 mutex_unlock(&rdev->devlist_mtx);
742                 break;
743         case NETDEV_PRE_UP:
744                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
745                         return notifier_from_errno(-EOPNOTSUPP);
746                 if (rfkill_blocked(rdev->rfkill))
747                         return notifier_from_errno(-ERFKILL);
748                 break;
749         }
750
751         return NOTIFY_DONE;
752 }
753
754 static struct notifier_block cfg80211_netdev_notifier = {
755         .notifier_call = cfg80211_netdev_notifier_call,
756 };
757
758 static void __net_exit cfg80211_pernet_exit(struct net *net)
759 {
760         struct cfg80211_registered_device *rdev;
761
762         rtnl_lock();
763         mutex_lock(&cfg80211_mutex);
764         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
765                 if (net_eq(wiphy_net(&rdev->wiphy), net))
766                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
767         }
768         mutex_unlock(&cfg80211_mutex);
769         rtnl_unlock();
770 }
771
772 static struct pernet_operations cfg80211_pernet_ops = {
773         .exit = cfg80211_pernet_exit,
774 };
775
776 static int __init cfg80211_init(void)
777 {
778         int err;
779
780         err = register_pernet_device(&cfg80211_pernet_ops);
781         if (err)
782                 goto out_fail_pernet;
783
784         err = wiphy_sysfs_init();
785         if (err)
786                 goto out_fail_sysfs;
787
788         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
789         if (err)
790                 goto out_fail_notifier;
791
792         err = nl80211_init();
793         if (err)
794                 goto out_fail_nl80211;
795
796         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
797
798         err = regulatory_init();
799         if (err)
800                 goto out_fail_reg;
801
802         return 0;
803
804 out_fail_reg:
805         debugfs_remove(ieee80211_debugfs_dir);
806 out_fail_nl80211:
807         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
808 out_fail_notifier:
809         wiphy_sysfs_exit();
810 out_fail_sysfs:
811         unregister_pernet_device(&cfg80211_pernet_ops);
812 out_fail_pernet:
813         return err;
814 }
815 subsys_initcall(cfg80211_init);
816
817 static void cfg80211_exit(void)
818 {
819         debugfs_remove(ieee80211_debugfs_dir);
820         nl80211_exit();
821         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
822         wiphy_sysfs_exit();
823         regulatory_exit();
824         unregister_pernet_device(&cfg80211_pernet_ops);
825 }
826 module_exit(cfg80211_exit);