cfg80211: disallow bridging managed/adhoc interfaces
[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 <net/genetlink.h>
18 #include <net/cfg80211.h>
19 #include "nl80211.h"
20 #include "core.h"
21 #include "sysfs.h"
22 #include "debugfs.h"
23 #include "wext-compat.h"
24 #include "ethtool.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.flags & WIPHY_FLAG_NETNS_OK))
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 #ifdef CONFIG_CFG80211_WEXT
363         rdev->wiphy.wext = &cfg80211_wext_handler;
364 #endif
365
366         device_initialize(&rdev->wiphy.dev);
367         rdev->wiphy.dev.class = &ieee80211_class;
368         rdev->wiphy.dev.platform_data = rdev;
369
370 #ifdef CONFIG_CFG80211_DEFAULT_PS
371         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
372 #endif
373
374         wiphy_net_set(&rdev->wiphy, &init_net);
375
376         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
377         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
378                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
379                                    &rdev->rfkill_ops, rdev);
380
381         if (!rdev->rfkill) {
382                 kfree(rdev);
383                 return NULL;
384         }
385
386         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
387         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
388         INIT_WORK(&rdev->event_work, cfg80211_event_work);
389
390         init_waitqueue_head(&rdev->dev_wait);
391
392         /*
393          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
394          * Fragmentation and RTS threshold are disabled by default with the
395          * special -1 value.
396          */
397         rdev->wiphy.retry_short = 7;
398         rdev->wiphy.retry_long = 4;
399         rdev->wiphy.frag_threshold = (u32) -1;
400         rdev->wiphy.rts_threshold = (u32) -1;
401
402         return &rdev->wiphy;
403 }
404 EXPORT_SYMBOL(wiphy_new);
405
406 int wiphy_register(struct wiphy *wiphy)
407 {
408         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
409         int res;
410         enum ieee80211_band band;
411         struct ieee80211_supported_band *sband;
412         bool have_band = false;
413         int i;
414         u16 ifmodes = wiphy->interface_modes;
415
416         /* sanity check ifmodes */
417         WARN_ON(!ifmodes);
418         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
419         if (WARN_ON(ifmodes != wiphy->interface_modes))
420                 wiphy->interface_modes = ifmodes;
421
422         /* sanity check supported bands/channels */
423         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
424                 sband = wiphy->bands[band];
425                 if (!sband)
426                         continue;
427
428                 sband->band = band;
429
430                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
431                         return -EINVAL;
432
433                 /*
434                  * Since we use a u32 for rate bitmaps in
435                  * ieee80211_get_response_rate, we cannot
436                  * have more than 32 legacy rates.
437                  */
438                 if (WARN_ON(sband->n_bitrates > 32))
439                         return -EINVAL;
440
441                 for (i = 0; i < sband->n_channels; i++) {
442                         sband->channels[i].orig_flags =
443                                 sband->channels[i].flags;
444                         sband->channels[i].orig_mag =
445                                 sband->channels[i].max_antenna_gain;
446                         sband->channels[i].orig_mpwr =
447                                 sband->channels[i].max_power;
448                         sband->channels[i].band = band;
449                 }
450
451                 have_band = true;
452         }
453
454         if (!have_band) {
455                 WARN_ON(1);
456                 return -EINVAL;
457         }
458
459         /* check and set up bitrates */
460         ieee80211_set_bitrate_flags(wiphy);
461
462         res = device_add(&rdev->wiphy.dev);
463         if (res)
464                 return res;
465
466         res = rfkill_register(rdev->rfkill);
467         if (res)
468                 goto out_rm_dev;
469
470         mutex_lock(&cfg80211_mutex);
471
472         /* set up regulatory info */
473         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
474
475         list_add(&rdev->list, &cfg80211_rdev_list);
476         cfg80211_rdev_list_generation++;
477
478         mutex_unlock(&cfg80211_mutex);
479
480         /* add to debugfs */
481         rdev->wiphy.debugfsdir =
482                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
483                                    ieee80211_debugfs_dir);
484         if (IS_ERR(rdev->wiphy.debugfsdir))
485                 rdev->wiphy.debugfsdir = NULL;
486
487         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
488                 struct regulatory_request request;
489
490                 request.wiphy_idx = get_wiphy_idx(wiphy);
491                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
492                 request.alpha2[0] = '9';
493                 request.alpha2[1] = '9';
494
495                 nl80211_send_reg_change_event(&request);
496         }
497
498         cfg80211_debugfs_rdev_add(rdev);
499
500         return 0;
501
502  out_rm_dev:
503         device_del(&rdev->wiphy.dev);
504         return res;
505 }
506 EXPORT_SYMBOL(wiphy_register);
507
508 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
509 {
510         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
511
512         if (!rdev->ops->rfkill_poll)
513                 return;
514         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
515         rfkill_resume_polling(rdev->rfkill);
516 }
517 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
518
519 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
520 {
521         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
522
523         rfkill_pause_polling(rdev->rfkill);
524 }
525 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
526
527 void wiphy_unregister(struct wiphy *wiphy)
528 {
529         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
530
531         rfkill_unregister(rdev->rfkill);
532
533         /* protect the device list */
534         mutex_lock(&cfg80211_mutex);
535
536         wait_event(rdev->dev_wait, ({
537                 int __count;
538                 mutex_lock(&rdev->devlist_mtx);
539                 __count = rdev->opencount;
540                 mutex_unlock(&rdev->devlist_mtx);
541                 __count == 0;}));
542
543         mutex_lock(&rdev->devlist_mtx);
544         BUG_ON(!list_empty(&rdev->netdev_list));
545         mutex_unlock(&rdev->devlist_mtx);
546
547         /*
548          * First remove the hardware from everywhere, this makes
549          * it impossible to find from userspace.
550          */
551         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
552         list_del(&rdev->list);
553
554         /*
555          * Try to grab rdev->mtx. If a command is still in progress,
556          * hopefully the driver will refuse it since it's tearing
557          * down the device already. We wait for this command to complete
558          * before unlinking the item from the list.
559          * Note: as codified by the BUG_ON above we cannot get here if
560          * a virtual interface is still present. Hence, we can only get
561          * to lock contention here if userspace issues a command that
562          * identified the hardware by wiphy index.
563          */
564         cfg80211_lock_rdev(rdev);
565         /* nothing */
566         cfg80211_unlock_rdev(rdev);
567
568         /* If this device got a regulatory hint tell core its
569          * free to listen now to a new shiny device regulatory hint */
570         reg_device_remove(wiphy);
571
572         cfg80211_rdev_list_generation++;
573         device_del(&rdev->wiphy.dev);
574
575         mutex_unlock(&cfg80211_mutex);
576
577         flush_work(&rdev->scan_done_wk);
578         cancel_work_sync(&rdev->conn_work);
579         flush_work(&rdev->event_work);
580 }
581 EXPORT_SYMBOL(wiphy_unregister);
582
583 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
584 {
585         struct cfg80211_internal_bss *scan, *tmp;
586         rfkill_destroy(rdev->rfkill);
587         mutex_destroy(&rdev->mtx);
588         mutex_destroy(&rdev->devlist_mtx);
589         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
590                 cfg80211_put_bss(&scan->pub);
591         kfree(rdev);
592 }
593
594 void wiphy_free(struct wiphy *wiphy)
595 {
596         put_device(&wiphy->dev);
597 }
598 EXPORT_SYMBOL(wiphy_free);
599
600 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
601 {
602         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
603
604         if (rfkill_set_hw_state(rdev->rfkill, blocked))
605                 schedule_work(&rdev->rfkill_sync);
606 }
607 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
608
609 static void wdev_cleanup_work(struct work_struct *work)
610 {
611         struct wireless_dev *wdev;
612         struct cfg80211_registered_device *rdev;
613
614         wdev = container_of(work, struct wireless_dev, cleanup_work);
615         rdev = wiphy_to_dev(wdev->wiphy);
616
617         cfg80211_lock_rdev(rdev);
618
619         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
620                 rdev->scan_req->aborted = true;
621                 ___cfg80211_scan_done(rdev, true);
622         }
623
624         cfg80211_unlock_rdev(rdev);
625
626         mutex_lock(&rdev->devlist_mtx);
627         rdev->opencount--;
628         mutex_unlock(&rdev->devlist_mtx);
629         wake_up(&rdev->dev_wait);
630
631         dev_put(wdev->netdev);
632 }
633
634 static struct device_type wiphy_type = {
635         .name   = "wlan",
636 };
637
638 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
639                                          unsigned long state,
640                                          void *ndev)
641 {
642         struct net_device *dev = ndev;
643         struct wireless_dev *wdev = dev->ieee80211_ptr;
644         struct cfg80211_registered_device *rdev;
645
646         if (!wdev)
647                 return NOTIFY_DONE;
648
649         rdev = wiphy_to_dev(wdev->wiphy);
650
651         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
652
653         switch (state) {
654         case NETDEV_POST_INIT:
655                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
656                 break;
657         case NETDEV_REGISTER:
658                 /*
659                  * NB: cannot take rdev->mtx here because this may be
660                  * called within code protected by it when interfaces
661                  * are added with nl80211.
662                  */
663                 mutex_init(&wdev->mtx);
664                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
665                 INIT_LIST_HEAD(&wdev->event_list);
666                 spin_lock_init(&wdev->event_lock);
667                 mutex_lock(&rdev->devlist_mtx);
668                 list_add(&wdev->list, &rdev->netdev_list);
669                 rdev->devlist_generation++;
670                 /* can only change netns with wiphy */
671                 dev->features |= NETIF_F_NETNS_LOCAL;
672
673                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
674                                       "phy80211")) {
675                         printk(KERN_ERR "wireless: failed to add phy80211 "
676                                 "symlink to netdev!\n");
677                 }
678                 wdev->netdev = dev;
679                 wdev->sme_state = CFG80211_SME_IDLE;
680                 mutex_unlock(&rdev->devlist_mtx);
681 #ifdef CONFIG_CFG80211_WEXT
682                 wdev->wext.default_key = -1;
683                 wdev->wext.default_mgmt_key = -1;
684                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
685                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
686                         wdev->wext.ps = true;
687                 else
688                         wdev->wext.ps = false;
689                 wdev->wext.ps_timeout = 100;
690                 if (rdev->ops->set_power_mgmt)
691                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
692                                                       wdev->wext.ps,
693                                                       wdev->wext.ps_timeout)) {
694                                 /* assume this means it's off */
695                                 wdev->wext.ps = false;
696                         }
697 #endif
698                 if (!dev->ethtool_ops)
699                         dev->ethtool_ops = &cfg80211_ethtool_ops;
700
701                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
702                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
703                         dev->priv_flags |= IFF_DONT_BRIDGE;
704                 break;
705         case NETDEV_GOING_DOWN:
706                 switch (wdev->iftype) {
707                 case NL80211_IFTYPE_ADHOC:
708                         cfg80211_leave_ibss(rdev, dev, true);
709                         break;
710                 case NL80211_IFTYPE_STATION:
711                         wdev_lock(wdev);
712 #ifdef CONFIG_CFG80211_WEXT
713                         kfree(wdev->wext.ie);
714                         wdev->wext.ie = NULL;
715                         wdev->wext.ie_len = 0;
716                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
717 #endif
718                         __cfg80211_disconnect(rdev, dev,
719                                               WLAN_REASON_DEAUTH_LEAVING, true);
720                         cfg80211_mlme_down(rdev, dev);
721                         wdev_unlock(wdev);
722                         break;
723                 default:
724                         break;
725                 }
726                 break;
727         case NETDEV_DOWN:
728                 dev_hold(dev);
729                 schedule_work(&wdev->cleanup_work);
730                 break;
731         case NETDEV_UP:
732                 /*
733                  * If we have a really quick DOWN/UP succession we may
734                  * have this work still pending ... cancel it and see
735                  * if it was pending, in which case we need to account
736                  * for some of the work it would have done.
737                  */
738                 if (cancel_work_sync(&wdev->cleanup_work)) {
739                         mutex_lock(&rdev->devlist_mtx);
740                         rdev->opencount--;
741                         mutex_unlock(&rdev->devlist_mtx);
742                         dev_put(dev);
743                 }
744 #ifdef CONFIG_CFG80211_WEXT
745                 cfg80211_lock_rdev(rdev);
746                 mutex_lock(&rdev->devlist_mtx);
747                 wdev_lock(wdev);
748                 switch (wdev->iftype) {
749                 case NL80211_IFTYPE_ADHOC:
750                         cfg80211_ibss_wext_join(rdev, wdev);
751                         break;
752                 case NL80211_IFTYPE_STATION:
753                         cfg80211_mgd_wext_connect(rdev, wdev);
754                         break;
755                 default:
756                         break;
757                 }
758                 wdev_unlock(wdev);
759                 rdev->opencount++;
760                 mutex_unlock(&rdev->devlist_mtx);
761                 cfg80211_unlock_rdev(rdev);
762 #endif
763                 break;
764         case NETDEV_UNREGISTER:
765                 /*
766                  * NB: cannot take rdev->mtx here because this may be
767                  * called within code protected by it when interfaces
768                  * are removed with nl80211.
769                  */
770                 mutex_lock(&rdev->devlist_mtx);
771                 /*
772                  * It is possible to get NETDEV_UNREGISTER
773                  * multiple times. To detect that, check
774                  * that the interface is still on the list
775                  * of registered interfaces, and only then
776                  * remove and clean it up.
777                  */
778                 if (!list_empty(&wdev->list)) {
779                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
780                         list_del_init(&wdev->list);
781                         rdev->devlist_generation++;
782 #ifdef CONFIG_CFG80211_WEXT
783                         kfree(wdev->wext.keys);
784 #endif
785                 }
786                 mutex_unlock(&rdev->devlist_mtx);
787                 break;
788         case NETDEV_PRE_UP:
789                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
790                         return notifier_from_errno(-EOPNOTSUPP);
791                 if (rfkill_blocked(rdev->rfkill))
792                         return notifier_from_errno(-ERFKILL);
793                 break;
794         }
795
796         return NOTIFY_DONE;
797 }
798
799 static struct notifier_block cfg80211_netdev_notifier = {
800         .notifier_call = cfg80211_netdev_notifier_call,
801 };
802
803 static void __net_exit cfg80211_pernet_exit(struct net *net)
804 {
805         struct cfg80211_registered_device *rdev;
806
807         rtnl_lock();
808         mutex_lock(&cfg80211_mutex);
809         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
810                 if (net_eq(wiphy_net(&rdev->wiphy), net))
811                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
812         }
813         mutex_unlock(&cfg80211_mutex);
814         rtnl_unlock();
815 }
816
817 static struct pernet_operations cfg80211_pernet_ops = {
818         .exit = cfg80211_pernet_exit,
819 };
820
821 static int __init cfg80211_init(void)
822 {
823         int err;
824
825         err = register_pernet_device(&cfg80211_pernet_ops);
826         if (err)
827                 goto out_fail_pernet;
828
829         err = wiphy_sysfs_init();
830         if (err)
831                 goto out_fail_sysfs;
832
833         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
834         if (err)
835                 goto out_fail_notifier;
836
837         err = nl80211_init();
838         if (err)
839                 goto out_fail_nl80211;
840
841         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
842
843         err = regulatory_init();
844         if (err)
845                 goto out_fail_reg;
846
847         return 0;
848
849 out_fail_reg:
850         debugfs_remove(ieee80211_debugfs_dir);
851 out_fail_nl80211:
852         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
853 out_fail_notifier:
854         wiphy_sysfs_exit();
855 out_fail_sysfs:
856         unregister_pernet_device(&cfg80211_pernet_ops);
857 out_fail_pernet:
858         return err;
859 }
860 subsys_initcall(cfg80211_init);
861
862 static void cfg80211_exit(void)
863 {
864         debugfs_remove(ieee80211_debugfs_dir);
865         nl80211_exit();
866         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
867         wiphy_sysfs_exit();
868         regulatory_exit();
869         unregister_pernet_device(&cfg80211_pernet_ops);
870 }
871 module_exit(cfg80211_exit);