nl80211: Add new WIPHY attribute COVERAGE_CLASS
[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 /* for the cleanup, scan and event works */
49 struct workqueue_struct *cfg80211_wq;
50
51 /* requires cfg80211_mutex to be held! */
52 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
53 {
54         struct cfg80211_registered_device *result = NULL, *rdev;
55
56         if (!wiphy_idx_valid(wiphy_idx))
57                 return NULL;
58
59         assert_cfg80211_lock();
60
61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
62                 if (rdev->wiphy_idx == wiphy_idx) {
63                         result = rdev;
64                         break;
65                 }
66         }
67
68         return result;
69 }
70
71 int get_wiphy_idx(struct wiphy *wiphy)
72 {
73         struct cfg80211_registered_device *rdev;
74         if (!wiphy)
75                 return WIPHY_IDX_STALE;
76         rdev = wiphy_to_dev(wiphy);
77         return rdev->wiphy_idx;
78 }
79
80 /* requires cfg80211_rdev_mutex to be held! */
81 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
82 {
83         struct cfg80211_registered_device *rdev;
84
85         if (!wiphy_idx_valid(wiphy_idx))
86                 return NULL;
87
88         assert_cfg80211_lock();
89
90         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
91         if (!rdev)
92                 return NULL;
93         return &rdev->wiphy;
94 }
95
96 /* requires cfg80211_mutex to be held! */
97 struct cfg80211_registered_device *
98 __cfg80211_rdev_from_info(struct genl_info *info)
99 {
100         int ifindex;
101         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
102         struct net_device *dev;
103         int err = -EINVAL;
104
105         assert_cfg80211_lock();
106
107         if (info->attrs[NL80211_ATTR_WIPHY]) {
108                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
109                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
110                 err = -ENODEV;
111         }
112
113         if (info->attrs[NL80211_ATTR_IFINDEX]) {
114                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
115                 dev = dev_get_by_index(genl_info_net(info), ifindex);
116                 if (dev) {
117                         if (dev->ieee80211_ptr)
118                                 byifidx =
119                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
120                         dev_put(dev);
121                 }
122                 err = -ENODEV;
123         }
124
125         if (bywiphyidx && byifidx) {
126                 if (bywiphyidx != byifidx)
127                         return ERR_PTR(-EINVAL);
128                 else
129                         return bywiphyidx; /* == byifidx */
130         }
131         if (bywiphyidx)
132                 return bywiphyidx;
133
134         if (byifidx)
135                 return byifidx;
136
137         return ERR_PTR(err);
138 }
139
140 struct cfg80211_registered_device *
141 cfg80211_get_dev_from_info(struct genl_info *info)
142 {
143         struct cfg80211_registered_device *rdev;
144
145         mutex_lock(&cfg80211_mutex);
146         rdev = __cfg80211_rdev_from_info(info);
147
148         /* if it is not an error we grab the lock on
149          * it to assure it won't be going away while
150          * we operate on it */
151         if (!IS_ERR(rdev))
152                 mutex_lock(&rdev->mtx);
153
154         mutex_unlock(&cfg80211_mutex);
155
156         return rdev;
157 }
158
159 struct cfg80211_registered_device *
160 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
161 {
162         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
163         struct net_device *dev;
164
165         mutex_lock(&cfg80211_mutex);
166         dev = dev_get_by_index(net, ifindex);
167         if (!dev)
168                 goto out;
169         if (dev->ieee80211_ptr) {
170                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
171                 mutex_lock(&rdev->mtx);
172         } else
173                 rdev = ERR_PTR(-ENODEV);
174         dev_put(dev);
175  out:
176         mutex_unlock(&cfg80211_mutex);
177         return rdev;
178 }
179
180 /* requires cfg80211_mutex to be held */
181 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
182                         char *newname)
183 {
184         struct cfg80211_registered_device *rdev2;
185         int wiphy_idx, taken = -1, result, digits;
186
187         assert_cfg80211_lock();
188
189         /* prohibit calling the thing phy%d when %d is not its number */
190         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
191         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
192                 /* count number of places needed to print wiphy_idx */
193                 digits = 1;
194                 while (wiphy_idx /= 10)
195                         digits++;
196                 /*
197                  * deny the name if it is phy<idx> where <idx> is printed
198                  * without leading zeroes. taken == strlen(newname) here
199                  */
200                 if (taken == strlen(PHY_NAME) + digits)
201                         return -EINVAL;
202         }
203
204
205         /* Ignore nop renames */
206         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
207                 return 0;
208
209         /* Ensure another device does not already have this name. */
210         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
211                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
212                         return -EINVAL;
213
214         result = device_rename(&rdev->wiphy.dev, newname);
215         if (result)
216                 return result;
217
218         if (rdev->wiphy.debugfsdir &&
219             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
220                             rdev->wiphy.debugfsdir,
221                             rdev->wiphy.debugfsdir->d_parent,
222                             newname))
223                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
224                        newname);
225
226         nl80211_notify_dev_rename(rdev);
227
228         return 0;
229 }
230
231 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
232                           struct net *net)
233 {
234         struct wireless_dev *wdev;
235         int err = 0;
236
237         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
238                 return -EOPNOTSUPP;
239
240         list_for_each_entry(wdev, &rdev->netdev_list, list) {
241                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
242                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
243                 if (err)
244                         break;
245                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
246         }
247
248         if (err) {
249                 /* failed -- clean up to old netns */
250                 net = wiphy_net(&rdev->wiphy);
251
252                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
253                                                      list) {
254                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
255                         err = dev_change_net_namespace(wdev->netdev, net,
256                                                         "wlan%d");
257                         WARN_ON(err);
258                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
259                 }
260         }
261
262         wiphy_net_set(&rdev->wiphy, net);
263
264         return err;
265 }
266
267 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
268 {
269         struct cfg80211_registered_device *rdev = data;
270
271         rdev->ops->rfkill_poll(&rdev->wiphy);
272 }
273
274 static int cfg80211_rfkill_set_block(void *data, bool blocked)
275 {
276         struct cfg80211_registered_device *rdev = data;
277         struct wireless_dev *wdev;
278
279         if (!blocked)
280                 return 0;
281
282         rtnl_lock();
283         mutex_lock(&rdev->devlist_mtx);
284
285         list_for_each_entry(wdev, &rdev->netdev_list, list)
286                 dev_close(wdev->netdev);
287
288         mutex_unlock(&rdev->devlist_mtx);
289         rtnl_unlock();
290
291         return 0;
292 }
293
294 static void cfg80211_rfkill_sync_work(struct work_struct *work)
295 {
296         struct cfg80211_registered_device *rdev;
297
298         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
299         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
300 }
301
302 static void cfg80211_event_work(struct work_struct *work)
303 {
304         struct cfg80211_registered_device *rdev;
305
306         rdev = container_of(work, struct cfg80211_registered_device,
307                             event_work);
308
309         rtnl_lock();
310         cfg80211_lock_rdev(rdev);
311
312         cfg80211_process_rdev_events(rdev);
313         cfg80211_unlock_rdev(rdev);
314         rtnl_unlock();
315 }
316
317 /* exported functions */
318
319 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
320 {
321         static int wiphy_counter;
322
323         struct cfg80211_registered_device *rdev;
324         int alloc_size;
325
326         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
327         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
328         WARN_ON(ops->connect && !ops->disconnect);
329         WARN_ON(ops->join_ibss && !ops->leave_ibss);
330         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
331         WARN_ON(ops->add_station && !ops->del_station);
332         WARN_ON(ops->add_mpath && !ops->del_mpath);
333
334         alloc_size = sizeof(*rdev) + sizeof_priv;
335
336         rdev = kzalloc(alloc_size, GFP_KERNEL);
337         if (!rdev)
338                 return NULL;
339
340         rdev->ops = ops;
341
342         mutex_lock(&cfg80211_mutex);
343
344         rdev->wiphy_idx = wiphy_counter++;
345
346         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
347                 wiphy_counter--;
348                 mutex_unlock(&cfg80211_mutex);
349                 /* ugh, wrapped! */
350                 kfree(rdev);
351                 return NULL;
352         }
353
354         mutex_unlock(&cfg80211_mutex);
355
356         /* give it a proper name */
357         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
358
359         mutex_init(&rdev->mtx);
360         mutex_init(&rdev->devlist_mtx);
361         INIT_LIST_HEAD(&rdev->netdev_list);
362         spin_lock_init(&rdev->bss_lock);
363         INIT_LIST_HEAD(&rdev->bss_list);
364         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
365
366 #ifdef CONFIG_CFG80211_WEXT
367         rdev->wiphy.wext = &cfg80211_wext_handler;
368 #endif
369
370         device_initialize(&rdev->wiphy.dev);
371         rdev->wiphy.dev.class = &ieee80211_class;
372         rdev->wiphy.dev.platform_data = rdev;
373
374 #ifdef CONFIG_CFG80211_DEFAULT_PS
375         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
376 #endif
377
378         wiphy_net_set(&rdev->wiphy, &init_net);
379
380         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
381         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
382                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
383                                    &rdev->rfkill_ops, rdev);
384
385         if (!rdev->rfkill) {
386                 kfree(rdev);
387                 return NULL;
388         }
389
390         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
391         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
392         INIT_WORK(&rdev->event_work, cfg80211_event_work);
393
394         init_waitqueue_head(&rdev->dev_wait);
395
396         /*
397          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
398          * Fragmentation and RTS threshold are disabled by default with the
399          * special -1 value.
400          */
401         rdev->wiphy.retry_short = 7;
402         rdev->wiphy.retry_long = 4;
403         rdev->wiphy.frag_threshold = (u32) -1;
404         rdev->wiphy.rts_threshold = (u32) -1;
405         rdev->wiphy.coverage_class = 0;
406
407         return &rdev->wiphy;
408 }
409 EXPORT_SYMBOL(wiphy_new);
410
411 int wiphy_register(struct wiphy *wiphy)
412 {
413         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
414         int res;
415         enum ieee80211_band band;
416         struct ieee80211_supported_band *sband;
417         bool have_band = false;
418         int i;
419         u16 ifmodes = wiphy->interface_modes;
420
421         /* sanity check ifmodes */
422         WARN_ON(!ifmodes);
423         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
424         if (WARN_ON(ifmodes != wiphy->interface_modes))
425                 wiphy->interface_modes = ifmodes;
426
427         /* sanity check supported bands/channels */
428         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
429                 sband = wiphy->bands[band];
430                 if (!sband)
431                         continue;
432
433                 sband->band = band;
434
435                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
436                         return -EINVAL;
437
438                 /*
439                  * Since we use a u32 for rate bitmaps in
440                  * ieee80211_get_response_rate, we cannot
441                  * have more than 32 legacy rates.
442                  */
443                 if (WARN_ON(sband->n_bitrates > 32))
444                         return -EINVAL;
445
446                 for (i = 0; i < sband->n_channels; i++) {
447                         sband->channels[i].orig_flags =
448                                 sband->channels[i].flags;
449                         sband->channels[i].orig_mag =
450                                 sband->channels[i].max_antenna_gain;
451                         sband->channels[i].orig_mpwr =
452                                 sband->channels[i].max_power;
453                         sband->channels[i].band = band;
454                 }
455
456                 have_band = true;
457         }
458
459         if (!have_band) {
460                 WARN_ON(1);
461                 return -EINVAL;
462         }
463
464         /* check and set up bitrates */
465         ieee80211_set_bitrate_flags(wiphy);
466
467         res = device_add(&rdev->wiphy.dev);
468         if (res)
469                 return res;
470
471         res = rfkill_register(rdev->rfkill);
472         if (res)
473                 goto out_rm_dev;
474
475         mutex_lock(&cfg80211_mutex);
476
477         /* set up regulatory info */
478         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
479
480         list_add(&rdev->list, &cfg80211_rdev_list);
481         cfg80211_rdev_list_generation++;
482
483         mutex_unlock(&cfg80211_mutex);
484
485         /* add to debugfs */
486         rdev->wiphy.debugfsdir =
487                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
488                                    ieee80211_debugfs_dir);
489         if (IS_ERR(rdev->wiphy.debugfsdir))
490                 rdev->wiphy.debugfsdir = NULL;
491
492         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
493                 struct regulatory_request request;
494
495                 request.wiphy_idx = get_wiphy_idx(wiphy);
496                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
497                 request.alpha2[0] = '9';
498                 request.alpha2[1] = '9';
499
500                 nl80211_send_reg_change_event(&request);
501         }
502
503         cfg80211_debugfs_rdev_add(rdev);
504
505         return 0;
506
507  out_rm_dev:
508         device_del(&rdev->wiphy.dev);
509         return res;
510 }
511 EXPORT_SYMBOL(wiphy_register);
512
513 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
514 {
515         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
516
517         if (!rdev->ops->rfkill_poll)
518                 return;
519         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
520         rfkill_resume_polling(rdev->rfkill);
521 }
522 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
523
524 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
525 {
526         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
527
528         rfkill_pause_polling(rdev->rfkill);
529 }
530 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
531
532 void wiphy_unregister(struct wiphy *wiphy)
533 {
534         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
535
536         rfkill_unregister(rdev->rfkill);
537
538         /* protect the device list */
539         mutex_lock(&cfg80211_mutex);
540
541         wait_event(rdev->dev_wait, ({
542                 int __count;
543                 mutex_lock(&rdev->devlist_mtx);
544                 __count = rdev->opencount;
545                 mutex_unlock(&rdev->devlist_mtx);
546                 __count == 0;}));
547
548         mutex_lock(&rdev->devlist_mtx);
549         BUG_ON(!list_empty(&rdev->netdev_list));
550         mutex_unlock(&rdev->devlist_mtx);
551
552         /*
553          * First remove the hardware from everywhere, this makes
554          * it impossible to find from userspace.
555          */
556         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
557         list_del(&rdev->list);
558
559         /*
560          * Try to grab rdev->mtx. If a command is still in progress,
561          * hopefully the driver will refuse it since it's tearing
562          * down the device already. We wait for this command to complete
563          * before unlinking the item from the list.
564          * Note: as codified by the BUG_ON above we cannot get here if
565          * a virtual interface is still present. Hence, we can only get
566          * to lock contention here if userspace issues a command that
567          * identified the hardware by wiphy index.
568          */
569         cfg80211_lock_rdev(rdev);
570         /* nothing */
571         cfg80211_unlock_rdev(rdev);
572
573         /* If this device got a regulatory hint tell core its
574          * free to listen now to a new shiny device regulatory hint */
575         reg_device_remove(wiphy);
576
577         cfg80211_rdev_list_generation++;
578         device_del(&rdev->wiphy.dev);
579
580         mutex_unlock(&cfg80211_mutex);
581
582         flush_work(&rdev->scan_done_wk);
583         cancel_work_sync(&rdev->conn_work);
584         flush_work(&rdev->event_work);
585 }
586 EXPORT_SYMBOL(wiphy_unregister);
587
588 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
589 {
590         struct cfg80211_internal_bss *scan, *tmp;
591         rfkill_destroy(rdev->rfkill);
592         mutex_destroy(&rdev->mtx);
593         mutex_destroy(&rdev->devlist_mtx);
594         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
595                 cfg80211_put_bss(&scan->pub);
596         kfree(rdev);
597 }
598
599 void wiphy_free(struct wiphy *wiphy)
600 {
601         put_device(&wiphy->dev);
602 }
603 EXPORT_SYMBOL(wiphy_free);
604
605 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
606 {
607         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
608
609         if (rfkill_set_hw_state(rdev->rfkill, blocked))
610                 schedule_work(&rdev->rfkill_sync);
611 }
612 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
613
614 static void wdev_cleanup_work(struct work_struct *work)
615 {
616         struct wireless_dev *wdev;
617         struct cfg80211_registered_device *rdev;
618
619         wdev = container_of(work, struct wireless_dev, cleanup_work);
620         rdev = wiphy_to_dev(wdev->wiphy);
621
622         cfg80211_lock_rdev(rdev);
623
624         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
625                 rdev->scan_req->aborted = true;
626                 ___cfg80211_scan_done(rdev, true);
627         }
628
629         cfg80211_unlock_rdev(rdev);
630
631         mutex_lock(&rdev->devlist_mtx);
632         rdev->opencount--;
633         mutex_unlock(&rdev->devlist_mtx);
634         wake_up(&rdev->dev_wait);
635
636         dev_put(wdev->netdev);
637 }
638
639 static struct device_type wiphy_type = {
640         .name   = "wlan",
641 };
642
643 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
644                                          unsigned long state,
645                                          void *ndev)
646 {
647         struct net_device *dev = ndev;
648         struct wireless_dev *wdev = dev->ieee80211_ptr;
649         struct cfg80211_registered_device *rdev;
650
651         if (!wdev)
652                 return NOTIFY_DONE;
653
654         rdev = wiphy_to_dev(wdev->wiphy);
655
656         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
657
658         switch (state) {
659         case NETDEV_POST_INIT:
660                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
661                 break;
662         case NETDEV_REGISTER:
663                 /*
664                  * NB: cannot take rdev->mtx here because this may be
665                  * called within code protected by it when interfaces
666                  * are added with nl80211.
667                  */
668                 mutex_init(&wdev->mtx);
669                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
670                 INIT_LIST_HEAD(&wdev->event_list);
671                 spin_lock_init(&wdev->event_lock);
672                 mutex_lock(&rdev->devlist_mtx);
673                 list_add(&wdev->list, &rdev->netdev_list);
674                 rdev->devlist_generation++;
675                 /* can only change netns with wiphy */
676                 dev->features |= NETIF_F_NETNS_LOCAL;
677
678                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
679                                       "phy80211")) {
680                         printk(KERN_ERR "wireless: failed to add phy80211 "
681                                 "symlink to netdev!\n");
682                 }
683                 wdev->netdev = dev;
684                 wdev->sme_state = CFG80211_SME_IDLE;
685                 mutex_unlock(&rdev->devlist_mtx);
686 #ifdef CONFIG_CFG80211_WEXT
687                 wdev->wext.default_key = -1;
688                 wdev->wext.default_mgmt_key = -1;
689                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
690                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
691                         wdev->wext.ps = true;
692                 else
693                         wdev->wext.ps = false;
694                 wdev->wext.ps_timeout = 100;
695                 if (rdev->ops->set_power_mgmt)
696                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
697                                                       wdev->wext.ps,
698                                                       wdev->wext.ps_timeout)) {
699                                 /* assume this means it's off */
700                                 wdev->wext.ps = false;
701                         }
702 #endif
703                 if (!dev->ethtool_ops)
704                         dev->ethtool_ops = &cfg80211_ethtool_ops;
705
706                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
707                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
708                         dev->priv_flags |= IFF_DONT_BRIDGE;
709                 break;
710         case NETDEV_GOING_DOWN:
711                 switch (wdev->iftype) {
712                 case NL80211_IFTYPE_ADHOC:
713                         cfg80211_leave_ibss(rdev, dev, true);
714                         break;
715                 case NL80211_IFTYPE_STATION:
716                         wdev_lock(wdev);
717 #ifdef CONFIG_CFG80211_WEXT
718                         kfree(wdev->wext.ie);
719                         wdev->wext.ie = NULL;
720                         wdev->wext.ie_len = 0;
721                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
722 #endif
723                         __cfg80211_disconnect(rdev, dev,
724                                               WLAN_REASON_DEAUTH_LEAVING, true);
725                         cfg80211_mlme_down(rdev, dev);
726                         wdev_unlock(wdev);
727                         break;
728                 default:
729                         break;
730                 }
731                 break;
732         case NETDEV_DOWN:
733                 dev_hold(dev);
734                 queue_work(cfg80211_wq, &wdev->cleanup_work);
735                 break;
736         case NETDEV_UP:
737                 /*
738                  * If we have a really quick DOWN/UP succession we may
739                  * have this work still pending ... cancel it and see
740                  * if it was pending, in which case we need to account
741                  * for some of the work it would have done.
742                  */
743                 if (cancel_work_sync(&wdev->cleanup_work)) {
744                         mutex_lock(&rdev->devlist_mtx);
745                         rdev->opencount--;
746                         mutex_unlock(&rdev->devlist_mtx);
747                         dev_put(dev);
748                 }
749 #ifdef CONFIG_CFG80211_WEXT
750                 cfg80211_lock_rdev(rdev);
751                 mutex_lock(&rdev->devlist_mtx);
752                 wdev_lock(wdev);
753                 switch (wdev->iftype) {
754                 case NL80211_IFTYPE_ADHOC:
755                         cfg80211_ibss_wext_join(rdev, wdev);
756                         break;
757                 case NL80211_IFTYPE_STATION:
758                         cfg80211_mgd_wext_connect(rdev, wdev);
759                         break;
760                 default:
761                         break;
762                 }
763                 wdev_unlock(wdev);
764                 rdev->opencount++;
765                 mutex_unlock(&rdev->devlist_mtx);
766                 cfg80211_unlock_rdev(rdev);
767 #endif
768                 break;
769         case NETDEV_UNREGISTER:
770                 /*
771                  * NB: cannot take rdev->mtx here because this may be
772                  * called within code protected by it when interfaces
773                  * are removed with nl80211.
774                  */
775                 mutex_lock(&rdev->devlist_mtx);
776                 /*
777                  * It is possible to get NETDEV_UNREGISTER
778                  * multiple times. To detect that, check
779                  * that the interface is still on the list
780                  * of registered interfaces, and only then
781                  * remove and clean it up.
782                  */
783                 if (!list_empty(&wdev->list)) {
784                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
785                         list_del_init(&wdev->list);
786                         rdev->devlist_generation++;
787 #ifdef CONFIG_CFG80211_WEXT
788                         kfree(wdev->wext.keys);
789 #endif
790                 }
791                 mutex_unlock(&rdev->devlist_mtx);
792                 break;
793         case NETDEV_PRE_UP:
794                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
795                         return notifier_from_errno(-EOPNOTSUPP);
796                 if (rfkill_blocked(rdev->rfkill))
797                         return notifier_from_errno(-ERFKILL);
798                 break;
799         }
800
801         return NOTIFY_DONE;
802 }
803
804 static struct notifier_block cfg80211_netdev_notifier = {
805         .notifier_call = cfg80211_netdev_notifier_call,
806 };
807
808 static void __net_exit cfg80211_pernet_exit(struct net *net)
809 {
810         struct cfg80211_registered_device *rdev;
811
812         rtnl_lock();
813         mutex_lock(&cfg80211_mutex);
814         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
815                 if (net_eq(wiphy_net(&rdev->wiphy), net))
816                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
817         }
818         mutex_unlock(&cfg80211_mutex);
819         rtnl_unlock();
820 }
821
822 static struct pernet_operations cfg80211_pernet_ops = {
823         .exit = cfg80211_pernet_exit,
824 };
825
826 static int __init cfg80211_init(void)
827 {
828         int err;
829
830         err = register_pernet_device(&cfg80211_pernet_ops);
831         if (err)
832                 goto out_fail_pernet;
833
834         err = wiphy_sysfs_init();
835         if (err)
836                 goto out_fail_sysfs;
837
838         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
839         if (err)
840                 goto out_fail_notifier;
841
842         err = nl80211_init();
843         if (err)
844                 goto out_fail_nl80211;
845
846         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
847
848         err = regulatory_init();
849         if (err)
850                 goto out_fail_reg;
851
852         cfg80211_wq = create_singlethread_workqueue("cfg80211");
853         if (!cfg80211_wq)
854                 goto out_fail_wq;
855
856         return 0;
857
858 out_fail_wq:
859         regulatory_exit();
860 out_fail_reg:
861         debugfs_remove(ieee80211_debugfs_dir);
862 out_fail_nl80211:
863         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
864 out_fail_notifier:
865         wiphy_sysfs_exit();
866 out_fail_sysfs:
867         unregister_pernet_device(&cfg80211_pernet_ops);
868 out_fail_pernet:
869         return err;
870 }
871 subsys_initcall(cfg80211_init);
872
873 static void cfg80211_exit(void)
874 {
875         debugfs_remove(ieee80211_debugfs_dir);
876         nl80211_exit();
877         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
878         wiphy_sysfs_exit();
879         regulatory_exit();
880         unregister_pernet_device(&cfg80211_pernet_ops);
881         destroy_workqueue(cfg80211_wq);
882 }
883 module_exit(cfg80211_exit);