Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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.netnsok)
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         rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
372
373         wiphy_net_set(&rdev->wiphy, &init_net);
374
375         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
376         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
377                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
378                                    &rdev->rfkill_ops, rdev);
379
380         if (!rdev->rfkill) {
381                 kfree(rdev);
382                 return NULL;
383         }
384
385         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
386         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
387         INIT_WORK(&rdev->event_work, cfg80211_event_work);
388
389         init_waitqueue_head(&rdev->dev_wait);
390
391         /*
392          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
393          * Fragmentation and RTS threshold are disabled by default with the
394          * special -1 value.
395          */
396         rdev->wiphy.retry_short = 7;
397         rdev->wiphy.retry_long = 4;
398         rdev->wiphy.frag_threshold = (u32) -1;
399         rdev->wiphy.rts_threshold = (u32) -1;
400
401         return &rdev->wiphy;
402 }
403 EXPORT_SYMBOL(wiphy_new);
404
405 int wiphy_register(struct wiphy *wiphy)
406 {
407         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
408         int res;
409         enum ieee80211_band band;
410         struct ieee80211_supported_band *sband;
411         bool have_band = false;
412         int i;
413         u16 ifmodes = wiphy->interface_modes;
414
415         /* sanity check ifmodes */
416         WARN_ON(!ifmodes);
417         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
418         if (WARN_ON(ifmodes != wiphy->interface_modes))
419                 wiphy->interface_modes = ifmodes;
420
421         /* sanity check supported bands/channels */
422         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
423                 sband = wiphy->bands[band];
424                 if (!sband)
425                         continue;
426
427                 sband->band = band;
428
429                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
430                         return -EINVAL;
431
432                 /*
433                  * Since we use a u32 for rate bitmaps in
434                  * ieee80211_get_response_rate, we cannot
435                  * have more than 32 legacy rates.
436                  */
437                 if (WARN_ON(sband->n_bitrates > 32))
438                         return -EINVAL;
439
440                 for (i = 0; i < sband->n_channels; i++) {
441                         sband->channels[i].orig_flags =
442                                 sband->channels[i].flags;
443                         sband->channels[i].orig_mag =
444                                 sband->channels[i].max_antenna_gain;
445                         sband->channels[i].orig_mpwr =
446                                 sband->channels[i].max_power;
447                         sband->channels[i].band = band;
448                 }
449
450                 have_band = true;
451         }
452
453         if (!have_band) {
454                 WARN_ON(1);
455                 return -EINVAL;
456         }
457
458         /* check and set up bitrates */
459         ieee80211_set_bitrate_flags(wiphy);
460
461         res = device_add(&rdev->wiphy.dev);
462         if (res)
463                 return res;
464
465         res = rfkill_register(rdev->rfkill);
466         if (res)
467                 goto out_rm_dev;
468
469         mutex_lock(&cfg80211_mutex);
470
471         /* set up regulatory info */
472         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
473
474         list_add(&rdev->list, &cfg80211_rdev_list);
475         cfg80211_rdev_list_generation++;
476
477         mutex_unlock(&cfg80211_mutex);
478
479         /* add to debugfs */
480         rdev->wiphy.debugfsdir =
481                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
482                                    ieee80211_debugfs_dir);
483         if (IS_ERR(rdev->wiphy.debugfsdir))
484                 rdev->wiphy.debugfsdir = NULL;
485
486         if (wiphy->custom_regulatory) {
487                 struct regulatory_request request;
488
489                 request.wiphy_idx = get_wiphy_idx(wiphy);
490                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
491                 request.alpha2[0] = '9';
492                 request.alpha2[1] = '9';
493
494                 nl80211_send_reg_change_event(&request);
495         }
496
497         cfg80211_debugfs_rdev_add(rdev);
498
499         return 0;
500
501  out_rm_dev:
502         device_del(&rdev->wiphy.dev);
503         return res;
504 }
505 EXPORT_SYMBOL(wiphy_register);
506
507 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
508 {
509         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
510
511         if (!rdev->ops->rfkill_poll)
512                 return;
513         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
514         rfkill_resume_polling(rdev->rfkill);
515 }
516 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
517
518 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
519 {
520         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
521
522         rfkill_pause_polling(rdev->rfkill);
523 }
524 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
525
526 void wiphy_unregister(struct wiphy *wiphy)
527 {
528         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
529
530         rfkill_unregister(rdev->rfkill);
531
532         /* protect the device list */
533         mutex_lock(&cfg80211_mutex);
534
535         wait_event(rdev->dev_wait, ({
536                 int __count;
537                 mutex_lock(&rdev->devlist_mtx);
538                 __count = rdev->opencount;
539                 mutex_unlock(&rdev->devlist_mtx);
540                 __count == 0;}));
541
542         mutex_lock(&rdev->devlist_mtx);
543         BUG_ON(!list_empty(&rdev->netdev_list));
544         mutex_unlock(&rdev->devlist_mtx);
545
546         /*
547          * First remove the hardware from everywhere, this makes
548          * it impossible to find from userspace.
549          */
550         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
551         list_del(&rdev->list);
552
553         /*
554          * Try to grab rdev->mtx. If a command is still in progress,
555          * hopefully the driver will refuse it since it's tearing
556          * down the device already. We wait for this command to complete
557          * before unlinking the item from the list.
558          * Note: as codified by the BUG_ON above we cannot get here if
559          * a virtual interface is still present. Hence, we can only get
560          * to lock contention here if userspace issues a command that
561          * identified the hardware by wiphy index.
562          */
563         cfg80211_lock_rdev(rdev);
564         /* nothing */
565         cfg80211_unlock_rdev(rdev);
566
567         /* If this device got a regulatory hint tell core its
568          * free to listen now to a new shiny device regulatory hint */
569         reg_device_remove(wiphy);
570
571         cfg80211_rdev_list_generation++;
572         device_del(&rdev->wiphy.dev);
573
574         mutex_unlock(&cfg80211_mutex);
575
576         flush_work(&rdev->scan_done_wk);
577         cancel_work_sync(&rdev->conn_work);
578         flush_work(&rdev->event_work);
579 }
580 EXPORT_SYMBOL(wiphy_unregister);
581
582 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
583 {
584         struct cfg80211_internal_bss *scan, *tmp;
585         rfkill_destroy(rdev->rfkill);
586         mutex_destroy(&rdev->mtx);
587         mutex_destroy(&rdev->devlist_mtx);
588         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
589                 cfg80211_put_bss(&scan->pub);
590         kfree(rdev);
591 }
592
593 void wiphy_free(struct wiphy *wiphy)
594 {
595         put_device(&wiphy->dev);
596 }
597 EXPORT_SYMBOL(wiphy_free);
598
599 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
600 {
601         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
602
603         if (rfkill_set_hw_state(rdev->rfkill, blocked))
604                 schedule_work(&rdev->rfkill_sync);
605 }
606 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
607
608 static void wdev_cleanup_work(struct work_struct *work)
609 {
610         struct wireless_dev *wdev;
611         struct cfg80211_registered_device *rdev;
612
613         wdev = container_of(work, struct wireless_dev, cleanup_work);
614         rdev = wiphy_to_dev(wdev->wiphy);
615
616         cfg80211_lock_rdev(rdev);
617
618         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
619                 rdev->scan_req->aborted = true;
620                 ___cfg80211_scan_done(rdev, true);
621         }
622
623         cfg80211_unlock_rdev(rdev);
624
625         mutex_lock(&rdev->devlist_mtx);
626         rdev->opencount--;
627         mutex_unlock(&rdev->devlist_mtx);
628         wake_up(&rdev->dev_wait);
629
630         dev_put(wdev->netdev);
631 }
632
633 static struct device_type wiphy_type = {
634         .name   = "wlan",
635 };
636
637 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
638                                          unsigned long state,
639                                          void *ndev)
640 {
641         struct net_device *dev = ndev;
642         struct wireless_dev *wdev = dev->ieee80211_ptr;
643         struct cfg80211_registered_device *rdev;
644
645         if (!wdev)
646                 return NOTIFY_DONE;
647
648         rdev = wiphy_to_dev(wdev->wiphy);
649
650         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
651
652         switch (state) {
653         case NETDEV_POST_INIT:
654                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
655                 break;
656         case NETDEV_REGISTER:
657                 /*
658                  * NB: cannot take rdev->mtx here because this may be
659                  * called within code protected by it when interfaces
660                  * are added with nl80211.
661                  */
662                 mutex_init(&wdev->mtx);
663                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
664                 INIT_LIST_HEAD(&wdev->event_list);
665                 spin_lock_init(&wdev->event_lock);
666                 mutex_lock(&rdev->devlist_mtx);
667                 list_add(&wdev->list, &rdev->netdev_list);
668                 rdev->devlist_generation++;
669                 /* can only change netns with wiphy */
670                 dev->features |= NETIF_F_NETNS_LOCAL;
671
672                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
673                                       "phy80211")) {
674                         printk(KERN_ERR "wireless: failed to add phy80211 "
675                                 "symlink to netdev!\n");
676                 }
677                 wdev->netdev = dev;
678                 wdev->sme_state = CFG80211_SME_IDLE;
679                 mutex_unlock(&rdev->devlist_mtx);
680 #ifdef CONFIG_CFG80211_WEXT
681                 wdev->wext.default_key = -1;
682                 wdev->wext.default_mgmt_key = -1;
683                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
684                 wdev->wext.ps = wdev->wiphy->ps_default;
685                 wdev->wext.ps_timeout = 100;
686                 if (rdev->ops->set_power_mgmt)
687                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
688                                                       wdev->wext.ps,
689                                                       wdev->wext.ps_timeout)) {
690                                 /* assume this means it's off */
691                                 wdev->wext.ps = false;
692                         }
693 #endif
694                 if (!dev->ethtool_ops)
695                         dev->ethtool_ops = &cfg80211_ethtool_ops;
696                 break;
697         case NETDEV_GOING_DOWN:
698                 switch (wdev->iftype) {
699                 case NL80211_IFTYPE_ADHOC:
700                         cfg80211_leave_ibss(rdev, dev, true);
701                         break;
702                 case NL80211_IFTYPE_STATION:
703                         wdev_lock(wdev);
704 #ifdef CONFIG_CFG80211_WEXT
705                         kfree(wdev->wext.ie);
706                         wdev->wext.ie = NULL;
707                         wdev->wext.ie_len = 0;
708                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
709 #endif
710                         __cfg80211_disconnect(rdev, dev,
711                                               WLAN_REASON_DEAUTH_LEAVING, true);
712                         cfg80211_mlme_down(rdev, dev);
713                         wdev_unlock(wdev);
714                         break;
715                 default:
716                         break;
717                 }
718                 break;
719         case NETDEV_DOWN:
720                 dev_hold(dev);
721                 schedule_work(&wdev->cleanup_work);
722                 break;
723         case NETDEV_UP:
724                 /*
725                  * If we have a really quick DOWN/UP succession we may
726                  * have this work still pending ... cancel it and see
727                  * if it was pending, in which case we need to account
728                  * for some of the work it would have done.
729                  */
730                 if (cancel_work_sync(&wdev->cleanup_work)) {
731                         mutex_lock(&rdev->devlist_mtx);
732                         rdev->opencount--;
733                         mutex_unlock(&rdev->devlist_mtx);
734                         dev_put(dev);
735                 }
736 #ifdef CONFIG_CFG80211_WEXT
737                 cfg80211_lock_rdev(rdev);
738                 mutex_lock(&rdev->devlist_mtx);
739                 wdev_lock(wdev);
740                 switch (wdev->iftype) {
741                 case NL80211_IFTYPE_ADHOC:
742                         cfg80211_ibss_wext_join(rdev, wdev);
743                         break;
744                 case NL80211_IFTYPE_STATION:
745                         cfg80211_mgd_wext_connect(rdev, wdev);
746                         break;
747                 default:
748                         break;
749                 }
750                 wdev_unlock(wdev);
751                 rdev->opencount++;
752                 mutex_unlock(&rdev->devlist_mtx);
753                 cfg80211_unlock_rdev(rdev);
754 #endif
755                 break;
756         case NETDEV_UNREGISTER:
757                 /*
758                  * NB: cannot take rdev->mtx here because this may be
759                  * called within code protected by it when interfaces
760                  * are removed with nl80211.
761                  */
762                 mutex_lock(&rdev->devlist_mtx);
763                 /*
764                  * It is possible to get NETDEV_UNREGISTER
765                  * multiple times. To detect that, check
766                  * that the interface is still on the list
767                  * of registered interfaces, and only then
768                  * remove and clean it up.
769                  */
770                 if (!list_empty(&wdev->list)) {
771                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
772                         list_del_init(&wdev->list);
773                         rdev->devlist_generation++;
774 #ifdef CONFIG_CFG80211_WEXT
775                         kfree(wdev->wext.keys);
776 #endif
777                 }
778                 mutex_unlock(&rdev->devlist_mtx);
779                 break;
780         case NETDEV_PRE_UP:
781                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
782                         return notifier_from_errno(-EOPNOTSUPP);
783                 if (rfkill_blocked(rdev->rfkill))
784                         return notifier_from_errno(-ERFKILL);
785                 break;
786         }
787
788         return NOTIFY_DONE;
789 }
790
791 static struct notifier_block cfg80211_netdev_notifier = {
792         .notifier_call = cfg80211_netdev_notifier_call,
793 };
794
795 static void __net_exit cfg80211_pernet_exit(struct net *net)
796 {
797         struct cfg80211_registered_device *rdev;
798
799         rtnl_lock();
800         mutex_lock(&cfg80211_mutex);
801         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
802                 if (net_eq(wiphy_net(&rdev->wiphy), net))
803                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
804         }
805         mutex_unlock(&cfg80211_mutex);
806         rtnl_unlock();
807 }
808
809 static struct pernet_operations cfg80211_pernet_ops = {
810         .exit = cfg80211_pernet_exit,
811 };
812
813 static int __init cfg80211_init(void)
814 {
815         int err;
816
817         err = register_pernet_device(&cfg80211_pernet_ops);
818         if (err)
819                 goto out_fail_pernet;
820
821         err = wiphy_sysfs_init();
822         if (err)
823                 goto out_fail_sysfs;
824
825         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
826         if (err)
827                 goto out_fail_notifier;
828
829         err = nl80211_init();
830         if (err)
831                 goto out_fail_nl80211;
832
833         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
834
835         err = regulatory_init();
836         if (err)
837                 goto out_fail_reg;
838
839         return 0;
840
841 out_fail_reg:
842         debugfs_remove(ieee80211_debugfs_dir);
843 out_fail_nl80211:
844         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
845 out_fail_notifier:
846         wiphy_sysfs_exit();
847 out_fail_sysfs:
848         unregister_pernet_device(&cfg80211_pernet_ops);
849 out_fail_pernet:
850         return err;
851 }
852 subsys_initcall(cfg80211_init);
853
854 static void cfg80211_exit(void)
855 {
856         debugfs_remove(ieee80211_debugfs_dir);
857         nl80211_exit();
858         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
859         wiphy_sysfs_exit();
860         regulatory_exit();
861         unregister_pernet_device(&cfg80211_pernet_ops);
862 }
863 module_exit(cfg80211_exit);