nl80211: Fix exit from nl80211_set_power_save
[linux-2.6.git] / net / wireless / core.c
1 /*
2  * This is the linux wireless configuration interface.
3  *
4  * Copyright 2006-2010          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/slab.h>
12 #include <linux/nl80211.h>
13 #include <linux/debugfs.h>
14 #include <linux/notifier.h>
15 #include <linux/device.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/sched.h>
19 #include <net/genetlink.h>
20 #include <net/cfg80211.h>
21 #include "nl80211.h"
22 #include "core.h"
23 #include "sysfs.h"
24 #include "debugfs.h"
25 #include "wext-compat.h"
26 #include "ethtool.h"
27
28 /* name for sysfs, %d is appended */
29 #define PHY_NAME "phy"
30
31 MODULE_AUTHOR("Johannes Berg");
32 MODULE_LICENSE("GPL");
33 MODULE_DESCRIPTION("wireless configuration support");
34
35 /* RCU-protected (and cfg80211_mutex for writers) */
36 LIST_HEAD(cfg80211_rdev_list);
37 int cfg80211_rdev_list_generation;
38
39 DEFINE_MUTEX(cfg80211_mutex);
40
41 /* for debugfs */
42 static struct dentry *ieee80211_debugfs_dir;
43
44 /* for the cleanup, scan and event works */
45 struct workqueue_struct *cfg80211_wq;
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                 return err;
258         }
259
260         wiphy_net_set(&rdev->wiphy, net);
261
262         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
263         WARN_ON(err);
264
265         return 0;
266 }
267
268 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
269 {
270         struct cfg80211_registered_device *rdev = data;
271
272         rdev->ops->rfkill_poll(&rdev->wiphy);
273 }
274
275 static int cfg80211_rfkill_set_block(void *data, bool blocked)
276 {
277         struct cfg80211_registered_device *rdev = data;
278         struct wireless_dev *wdev;
279
280         if (!blocked)
281                 return 0;
282
283         rtnl_lock();
284         mutex_lock(&rdev->devlist_mtx);
285
286         list_for_each_entry(wdev, &rdev->netdev_list, list)
287                 dev_close(wdev->netdev);
288
289         mutex_unlock(&rdev->devlist_mtx);
290         rtnl_unlock();
291
292         return 0;
293 }
294
295 static void cfg80211_rfkill_sync_work(struct work_struct *work)
296 {
297         struct cfg80211_registered_device *rdev;
298
299         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
300         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
301 }
302
303 static void cfg80211_event_work(struct work_struct *work)
304 {
305         struct cfg80211_registered_device *rdev;
306
307         rdev = container_of(work, struct cfg80211_registered_device,
308                             event_work);
309
310         rtnl_lock();
311         cfg80211_lock_rdev(rdev);
312
313         cfg80211_process_rdev_events(rdev);
314         cfg80211_unlock_rdev(rdev);
315         rtnl_unlock();
316 }
317
318 /* exported functions */
319
320 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
321 {
322         static int wiphy_counter;
323
324         struct cfg80211_registered_device *rdev;
325         int alloc_size;
326
327         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
328         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
329         WARN_ON(ops->connect && !ops->disconnect);
330         WARN_ON(ops->join_ibss && !ops->leave_ibss);
331         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
332         WARN_ON(ops->add_station && !ops->del_station);
333         WARN_ON(ops->add_mpath && !ops->del_mpath);
334
335         alloc_size = sizeof(*rdev) + sizeof_priv;
336
337         rdev = kzalloc(alloc_size, GFP_KERNEL);
338         if (!rdev)
339                 return NULL;
340
341         rdev->ops = ops;
342
343         mutex_lock(&cfg80211_mutex);
344
345         rdev->wiphy_idx = wiphy_counter++;
346
347         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
348                 wiphy_counter--;
349                 mutex_unlock(&cfg80211_mutex);
350                 /* ugh, wrapped! */
351                 kfree(rdev);
352                 return NULL;
353         }
354
355         mutex_unlock(&cfg80211_mutex);
356
357         /* give it a proper name */
358         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
359
360         mutex_init(&rdev->mtx);
361         mutex_init(&rdev->devlist_mtx);
362         INIT_LIST_HEAD(&rdev->netdev_list);
363         spin_lock_init(&rdev->bss_lock);
364         INIT_LIST_HEAD(&rdev->bss_list);
365         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
366
367 #ifdef CONFIG_CFG80211_WEXT
368         rdev->wiphy.wext = &cfg80211_wext_handler;
369 #endif
370
371         device_initialize(&rdev->wiphy.dev);
372         rdev->wiphy.dev.class = &ieee80211_class;
373         rdev->wiphy.dev.platform_data = rdev;
374
375 #ifdef CONFIG_CFG80211_DEFAULT_PS
376         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
377 #endif
378
379         wiphy_net_set(&rdev->wiphy, &init_net);
380
381         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
382         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
383                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
384                                    &rdev->rfkill_ops, rdev);
385
386         if (!rdev->rfkill) {
387                 kfree(rdev);
388                 return NULL;
389         }
390
391         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
392         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
393         INIT_WORK(&rdev->event_work, cfg80211_event_work);
394
395         init_waitqueue_head(&rdev->dev_wait);
396
397         /*
398          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
399          * Fragmentation and RTS threshold are disabled by default with the
400          * special -1 value.
401          */
402         rdev->wiphy.retry_short = 7;
403         rdev->wiphy.retry_long = 4;
404         rdev->wiphy.frag_threshold = (u32) -1;
405         rdev->wiphy.rts_threshold = (u32) -1;
406         rdev->wiphy.coverage_class = 0;
407
408         return &rdev->wiphy;
409 }
410 EXPORT_SYMBOL(wiphy_new);
411
412 int wiphy_register(struct wiphy *wiphy)
413 {
414         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
415         int res;
416         enum ieee80211_band band;
417         struct ieee80211_supported_band *sband;
418         bool have_band = false;
419         int i;
420         u16 ifmodes = wiphy->interface_modes;
421
422         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
423                 return -EINVAL;
424
425         if (WARN_ON(wiphy->addresses &&
426                     !is_zero_ether_addr(wiphy->perm_addr) &&
427                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
428                            ETH_ALEN)))
429                 return -EINVAL;
430
431         if (wiphy->addresses)
432                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
433
434         /* sanity check ifmodes */
435         WARN_ON(!ifmodes);
436         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
437         if (WARN_ON(ifmodes != wiphy->interface_modes))
438                 wiphy->interface_modes = ifmodes;
439
440         /* sanity check supported bands/channels */
441         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
442                 sband = wiphy->bands[band];
443                 if (!sband)
444                         continue;
445
446                 sband->band = band;
447
448                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
449                         return -EINVAL;
450
451                 /*
452                  * Since we use a u32 for rate bitmaps in
453                  * ieee80211_get_response_rate, we cannot
454                  * have more than 32 legacy rates.
455                  */
456                 if (WARN_ON(sband->n_bitrates > 32))
457                         return -EINVAL;
458
459                 for (i = 0; i < sband->n_channels; i++) {
460                         sband->channels[i].orig_flags =
461                                 sband->channels[i].flags;
462                         sband->channels[i].orig_mag =
463                                 sband->channels[i].max_antenna_gain;
464                         sband->channels[i].orig_mpwr =
465                                 sband->channels[i].max_power;
466                         sband->channels[i].band = band;
467                 }
468
469                 have_band = true;
470         }
471
472         if (!have_band) {
473                 WARN_ON(1);
474                 return -EINVAL;
475         }
476
477         /* check and set up bitrates */
478         ieee80211_set_bitrate_flags(wiphy);
479
480         mutex_lock(&cfg80211_mutex);
481
482         res = device_add(&rdev->wiphy.dev);
483         if (res) {
484                 mutex_unlock(&cfg80211_mutex);
485                 return res;
486         }
487
488         /* set up regulatory info */
489         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
490
491         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
492         cfg80211_rdev_list_generation++;
493
494         /* add to debugfs */
495         rdev->wiphy.debugfsdir =
496                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
497                                    ieee80211_debugfs_dir);
498         if (IS_ERR(rdev->wiphy.debugfsdir))
499                 rdev->wiphy.debugfsdir = NULL;
500
501         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
502                 struct regulatory_request request;
503
504                 request.wiphy_idx = get_wiphy_idx(wiphy);
505                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
506                 request.alpha2[0] = '9';
507                 request.alpha2[1] = '9';
508
509                 nl80211_send_reg_change_event(&request);
510         }
511
512         cfg80211_debugfs_rdev_add(rdev);
513         mutex_unlock(&cfg80211_mutex);
514
515         /*
516          * due to a locking dependency this has to be outside of the
517          * cfg80211_mutex lock
518          */
519         res = rfkill_register(rdev->rfkill);
520         if (res)
521                 goto out_rm_dev;
522
523         return 0;
524
525 out_rm_dev:
526         device_del(&rdev->wiphy.dev);
527         return res;
528 }
529 EXPORT_SYMBOL(wiphy_register);
530
531 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
532 {
533         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
534
535         if (!rdev->ops->rfkill_poll)
536                 return;
537         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
538         rfkill_resume_polling(rdev->rfkill);
539 }
540 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
541
542 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
543 {
544         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
545
546         rfkill_pause_polling(rdev->rfkill);
547 }
548 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
549
550 void wiphy_unregister(struct wiphy *wiphy)
551 {
552         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
553
554         rfkill_unregister(rdev->rfkill);
555
556         /* protect the device list */
557         mutex_lock(&cfg80211_mutex);
558
559         wait_event(rdev->dev_wait, ({
560                 int __count;
561                 mutex_lock(&rdev->devlist_mtx);
562                 __count = rdev->opencount;
563                 mutex_unlock(&rdev->devlist_mtx);
564                 __count == 0;}));
565
566         mutex_lock(&rdev->devlist_mtx);
567         BUG_ON(!list_empty(&rdev->netdev_list));
568         mutex_unlock(&rdev->devlist_mtx);
569
570         /*
571          * First remove the hardware from everywhere, this makes
572          * it impossible to find from userspace.
573          */
574         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
575         list_del_rcu(&rdev->list);
576         synchronize_rcu();
577
578         /*
579          * Try to grab rdev->mtx. If a command is still in progress,
580          * hopefully the driver will refuse it since it's tearing
581          * down the device already. We wait for this command to complete
582          * before unlinking the item from the list.
583          * Note: as codified by the BUG_ON above we cannot get here if
584          * a virtual interface is still present. Hence, we can only get
585          * to lock contention here if userspace issues a command that
586          * identified the hardware by wiphy index.
587          */
588         cfg80211_lock_rdev(rdev);
589         /* nothing */
590         cfg80211_unlock_rdev(rdev);
591
592         /* If this device got a regulatory hint tell core its
593          * free to listen now to a new shiny device regulatory hint */
594         reg_device_remove(wiphy);
595
596         cfg80211_rdev_list_generation++;
597         device_del(&rdev->wiphy.dev);
598
599         mutex_unlock(&cfg80211_mutex);
600
601         flush_work(&rdev->scan_done_wk);
602         cancel_work_sync(&rdev->conn_work);
603         flush_work(&rdev->event_work);
604 }
605 EXPORT_SYMBOL(wiphy_unregister);
606
607 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
608 {
609         struct cfg80211_internal_bss *scan, *tmp;
610         rfkill_destroy(rdev->rfkill);
611         mutex_destroy(&rdev->mtx);
612         mutex_destroy(&rdev->devlist_mtx);
613         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
614                 cfg80211_put_bss(&scan->pub);
615         kfree(rdev);
616 }
617
618 void wiphy_free(struct wiphy *wiphy)
619 {
620         put_device(&wiphy->dev);
621 }
622 EXPORT_SYMBOL(wiphy_free);
623
624 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
625 {
626         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
627
628         if (rfkill_set_hw_state(rdev->rfkill, blocked))
629                 schedule_work(&rdev->rfkill_sync);
630 }
631 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
632
633 static void wdev_cleanup_work(struct work_struct *work)
634 {
635         struct wireless_dev *wdev;
636         struct cfg80211_registered_device *rdev;
637
638         wdev = container_of(work, struct wireless_dev, cleanup_work);
639         rdev = wiphy_to_dev(wdev->wiphy);
640
641         cfg80211_lock_rdev(rdev);
642
643         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
644                 rdev->scan_req->aborted = true;
645                 ___cfg80211_scan_done(rdev, true);
646         }
647
648         cfg80211_unlock_rdev(rdev);
649
650         mutex_lock(&rdev->devlist_mtx);
651         rdev->opencount--;
652         mutex_unlock(&rdev->devlist_mtx);
653         wake_up(&rdev->dev_wait);
654
655         dev_put(wdev->netdev);
656 }
657
658 static struct device_type wiphy_type = {
659         .name   = "wlan",
660 };
661
662 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
663                                          unsigned long state,
664                                          void *ndev)
665 {
666         struct net_device *dev = ndev;
667         struct wireless_dev *wdev = dev->ieee80211_ptr;
668         struct cfg80211_registered_device *rdev;
669
670         if (!wdev)
671                 return NOTIFY_DONE;
672
673         rdev = wiphy_to_dev(wdev->wiphy);
674
675         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
676
677         switch (state) {
678         case NETDEV_POST_INIT:
679                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
680                 break;
681         case NETDEV_REGISTER:
682                 /*
683                  * NB: cannot take rdev->mtx here because this may be
684                  * called within code protected by it when interfaces
685                  * are added with nl80211.
686                  */
687                 mutex_init(&wdev->mtx);
688                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
689                 INIT_LIST_HEAD(&wdev->event_list);
690                 spin_lock_init(&wdev->event_lock);
691                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
692                 spin_lock_init(&wdev->mgmt_registrations_lock);
693
694                 mutex_lock(&rdev->devlist_mtx);
695                 list_add_rcu(&wdev->list, &rdev->netdev_list);
696                 rdev->devlist_generation++;
697                 /* can only change netns with wiphy */
698                 dev->features |= NETIF_F_NETNS_LOCAL;
699
700                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
701                                       "phy80211")) {
702                         printk(KERN_ERR "wireless: failed to add phy80211 "
703                                 "symlink to netdev!\n");
704                 }
705                 wdev->netdev = dev;
706                 wdev->sme_state = CFG80211_SME_IDLE;
707                 mutex_unlock(&rdev->devlist_mtx);
708 #ifdef CONFIG_CFG80211_WEXT
709                 wdev->wext.default_key = -1;
710                 wdev->wext.default_mgmt_key = -1;
711                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
712 #endif
713
714                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
715                         wdev->ps = true;
716                 else
717                         wdev->ps = false;
718                 /* allow mac80211 to determine the timeout */
719                 wdev->ps_timeout = -1;
720                 if (rdev->ops->set_power_mgmt)
721                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
722                                                       wdev->ps,
723                                                       wdev->ps_timeout)) {
724                                 /* assume this means it's off */
725                                 wdev->ps = false;
726                         }
727
728                 if (!dev->ethtool_ops)
729                         dev->ethtool_ops = &cfg80211_ethtool_ops;
730
731                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
732                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
733                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
734                         dev->priv_flags |= IFF_DONT_BRIDGE;
735                 break;
736         case NETDEV_GOING_DOWN:
737                 switch (wdev->iftype) {
738                 case NL80211_IFTYPE_ADHOC:
739                         cfg80211_leave_ibss(rdev, dev, true);
740                         break;
741                 case NL80211_IFTYPE_P2P_CLIENT:
742                 case NL80211_IFTYPE_STATION:
743                         wdev_lock(wdev);
744 #ifdef CONFIG_CFG80211_WEXT
745                         kfree(wdev->wext.ie);
746                         wdev->wext.ie = NULL;
747                         wdev->wext.ie_len = 0;
748                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
749 #endif
750                         __cfg80211_disconnect(rdev, dev,
751                                               WLAN_REASON_DEAUTH_LEAVING, true);
752                         cfg80211_mlme_down(rdev, dev);
753                         wdev_unlock(wdev);
754                         break;
755                 default:
756                         break;
757                 }
758                 break;
759         case NETDEV_DOWN:
760                 dev_hold(dev);
761                 queue_work(cfg80211_wq, &wdev->cleanup_work);
762                 break;
763         case NETDEV_UP:
764                 /*
765                  * If we have a really quick DOWN/UP succession we may
766                  * have this work still pending ... cancel it and see
767                  * if it was pending, in which case we need to account
768                  * for some of the work it would have done.
769                  */
770                 if (cancel_work_sync(&wdev->cleanup_work)) {
771                         mutex_lock(&rdev->devlist_mtx);
772                         rdev->opencount--;
773                         mutex_unlock(&rdev->devlist_mtx);
774                         dev_put(dev);
775                 }
776                 cfg80211_lock_rdev(rdev);
777                 mutex_lock(&rdev->devlist_mtx);
778 #ifdef CONFIG_CFG80211_WEXT
779                 wdev_lock(wdev);
780                 switch (wdev->iftype) {
781                 case NL80211_IFTYPE_ADHOC:
782                         cfg80211_ibss_wext_join(rdev, wdev);
783                         break;
784                 case NL80211_IFTYPE_STATION:
785                         cfg80211_mgd_wext_connect(rdev, wdev);
786                         break;
787                 default:
788                         break;
789                 }
790                 wdev_unlock(wdev);
791 #endif
792                 rdev->opencount++;
793                 mutex_unlock(&rdev->devlist_mtx);
794                 cfg80211_unlock_rdev(rdev);
795                 break;
796         case NETDEV_UNREGISTER:
797                 /*
798                  * NB: cannot take rdev->mtx here because this may be
799                  * called within code protected by it when interfaces
800                  * are removed with nl80211.
801                  */
802                 mutex_lock(&rdev->devlist_mtx);
803                 /*
804                  * It is possible to get NETDEV_UNREGISTER
805                  * multiple times. To detect that, check
806                  * that the interface is still on the list
807                  * of registered interfaces, and only then
808                  * remove and clean it up.
809                  */
810                 if (!list_empty(&wdev->list)) {
811                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
812                         list_del_rcu(&wdev->list);
813                         rdev->devlist_generation++;
814                         cfg80211_mlme_purge_registrations(wdev);
815 #ifdef CONFIG_CFG80211_WEXT
816                         kfree(wdev->wext.keys);
817 #endif
818                 }
819                 mutex_unlock(&rdev->devlist_mtx);
820                 /*
821                  * synchronise (so that we won't find this netdev
822                  * from other code any more) and then clear the list
823                  * head so that the above code can safely check for
824                  * !list_empty() to avoid double-cleanup.
825                  */
826                 synchronize_rcu();
827                 INIT_LIST_HEAD(&wdev->list);
828                 break;
829         case NETDEV_PRE_UP:
830                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
831                         return notifier_from_errno(-EOPNOTSUPP);
832                 if (rfkill_blocked(rdev->rfkill))
833                         return notifier_from_errno(-ERFKILL);
834                 break;
835         }
836
837         return NOTIFY_DONE;
838 }
839
840 static struct notifier_block cfg80211_netdev_notifier = {
841         .notifier_call = cfg80211_netdev_notifier_call,
842 };
843
844 static void __net_exit cfg80211_pernet_exit(struct net *net)
845 {
846         struct cfg80211_registered_device *rdev;
847
848         rtnl_lock();
849         mutex_lock(&cfg80211_mutex);
850         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
851                 if (net_eq(wiphy_net(&rdev->wiphy), net))
852                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
853         }
854         mutex_unlock(&cfg80211_mutex);
855         rtnl_unlock();
856 }
857
858 static struct pernet_operations cfg80211_pernet_ops = {
859         .exit = cfg80211_pernet_exit,
860 };
861
862 static int __init cfg80211_init(void)
863 {
864         int err;
865
866         err = register_pernet_device(&cfg80211_pernet_ops);
867         if (err)
868                 goto out_fail_pernet;
869
870         err = wiphy_sysfs_init();
871         if (err)
872                 goto out_fail_sysfs;
873
874         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
875         if (err)
876                 goto out_fail_notifier;
877
878         err = nl80211_init();
879         if (err)
880                 goto out_fail_nl80211;
881
882         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
883
884         err = regulatory_init();
885         if (err)
886                 goto out_fail_reg;
887
888         cfg80211_wq = create_singlethread_workqueue("cfg80211");
889         if (!cfg80211_wq)
890                 goto out_fail_wq;
891
892         return 0;
893
894 out_fail_wq:
895         regulatory_exit();
896 out_fail_reg:
897         debugfs_remove(ieee80211_debugfs_dir);
898 out_fail_nl80211:
899         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
900 out_fail_notifier:
901         wiphy_sysfs_exit();
902 out_fail_sysfs:
903         unregister_pernet_device(&cfg80211_pernet_ops);
904 out_fail_pernet:
905         return err;
906 }
907 subsys_initcall(cfg80211_init);
908
909 static void __exit cfg80211_exit(void)
910 {
911         debugfs_remove(ieee80211_debugfs_dir);
912         nl80211_exit();
913         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
914         wiphy_sysfs_exit();
915         regulatory_exit();
916         unregister_pernet_device(&cfg80211_pernet_ops);
917         destroy_workqueue(cfg80211_wq);
918 }
919 module_exit(cfg80211_exit);