cfg80211/mac80211: extensible frame processing
[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                 goto out_unlock;
485
486         res = rfkill_register(rdev->rfkill);
487         if (res)
488                 goto out_rm_dev;
489
490         /* set up regulatory info */
491         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
492
493         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
494         cfg80211_rdev_list_generation++;
495
496         /* add to debugfs */
497         rdev->wiphy.debugfsdir =
498                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
499                                    ieee80211_debugfs_dir);
500         if (IS_ERR(rdev->wiphy.debugfsdir))
501                 rdev->wiphy.debugfsdir = NULL;
502
503         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
504                 struct regulatory_request request;
505
506                 request.wiphy_idx = get_wiphy_idx(wiphy);
507                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
508                 request.alpha2[0] = '9';
509                 request.alpha2[1] = '9';
510
511                 nl80211_send_reg_change_event(&request);
512         }
513
514         cfg80211_debugfs_rdev_add(rdev);
515         mutex_unlock(&cfg80211_mutex);
516
517         return 0;
518
519 out_rm_dev:
520         device_del(&rdev->wiphy.dev);
521
522 out_unlock:
523         mutex_unlock(&cfg80211_mutex);
524         return res;
525 }
526 EXPORT_SYMBOL(wiphy_register);
527
528 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
529 {
530         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
531
532         if (!rdev->ops->rfkill_poll)
533                 return;
534         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
535         rfkill_resume_polling(rdev->rfkill);
536 }
537 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
538
539 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
540 {
541         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
542
543         rfkill_pause_polling(rdev->rfkill);
544 }
545 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
546
547 void wiphy_unregister(struct wiphy *wiphy)
548 {
549         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
550
551         rfkill_unregister(rdev->rfkill);
552
553         /* protect the device list */
554         mutex_lock(&cfg80211_mutex);
555
556         wait_event(rdev->dev_wait, ({
557                 int __count;
558                 mutex_lock(&rdev->devlist_mtx);
559                 __count = rdev->opencount;
560                 mutex_unlock(&rdev->devlist_mtx);
561                 __count == 0;}));
562
563         mutex_lock(&rdev->devlist_mtx);
564         BUG_ON(!list_empty(&rdev->netdev_list));
565         mutex_unlock(&rdev->devlist_mtx);
566
567         /*
568          * First remove the hardware from everywhere, this makes
569          * it impossible to find from userspace.
570          */
571         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
572         list_del_rcu(&rdev->list);
573         synchronize_rcu();
574
575         /*
576          * Try to grab rdev->mtx. If a command is still in progress,
577          * hopefully the driver will refuse it since it's tearing
578          * down the device already. We wait for this command to complete
579          * before unlinking the item from the list.
580          * Note: as codified by the BUG_ON above we cannot get here if
581          * a virtual interface is still present. Hence, we can only get
582          * to lock contention here if userspace issues a command that
583          * identified the hardware by wiphy index.
584          */
585         cfg80211_lock_rdev(rdev);
586         /* nothing */
587         cfg80211_unlock_rdev(rdev);
588
589         /* If this device got a regulatory hint tell core its
590          * free to listen now to a new shiny device regulatory hint */
591         reg_device_remove(wiphy);
592
593         cfg80211_rdev_list_generation++;
594         device_del(&rdev->wiphy.dev);
595
596         mutex_unlock(&cfg80211_mutex);
597
598         flush_work(&rdev->scan_done_wk);
599         cancel_work_sync(&rdev->conn_work);
600         flush_work(&rdev->event_work);
601 }
602 EXPORT_SYMBOL(wiphy_unregister);
603
604 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
605 {
606         struct cfg80211_internal_bss *scan, *tmp;
607         rfkill_destroy(rdev->rfkill);
608         mutex_destroy(&rdev->mtx);
609         mutex_destroy(&rdev->devlist_mtx);
610         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
611                 cfg80211_put_bss(&scan->pub);
612         kfree(rdev);
613 }
614
615 void wiphy_free(struct wiphy *wiphy)
616 {
617         put_device(&wiphy->dev);
618 }
619 EXPORT_SYMBOL(wiphy_free);
620
621 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
622 {
623         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
624
625         if (rfkill_set_hw_state(rdev->rfkill, blocked))
626                 schedule_work(&rdev->rfkill_sync);
627 }
628 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
629
630 static void wdev_cleanup_work(struct work_struct *work)
631 {
632         struct wireless_dev *wdev;
633         struct cfg80211_registered_device *rdev;
634
635         wdev = container_of(work, struct wireless_dev, cleanup_work);
636         rdev = wiphy_to_dev(wdev->wiphy);
637
638         cfg80211_lock_rdev(rdev);
639
640         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
641                 rdev->scan_req->aborted = true;
642                 ___cfg80211_scan_done(rdev, true);
643         }
644
645         cfg80211_unlock_rdev(rdev);
646
647         mutex_lock(&rdev->devlist_mtx);
648         rdev->opencount--;
649         mutex_unlock(&rdev->devlist_mtx);
650         wake_up(&rdev->dev_wait);
651
652         dev_put(wdev->netdev);
653 }
654
655 static struct device_type wiphy_type = {
656         .name   = "wlan",
657 };
658
659 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
660                                          unsigned long state,
661                                          void *ndev)
662 {
663         struct net_device *dev = ndev;
664         struct wireless_dev *wdev = dev->ieee80211_ptr;
665         struct cfg80211_registered_device *rdev;
666
667         if (!wdev)
668                 return NOTIFY_DONE;
669
670         rdev = wiphy_to_dev(wdev->wiphy);
671
672         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
673
674         switch (state) {
675         case NETDEV_POST_INIT:
676                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
677                 break;
678         case NETDEV_REGISTER:
679                 /*
680                  * NB: cannot take rdev->mtx here because this may be
681                  * called within code protected by it when interfaces
682                  * are added with nl80211.
683                  */
684                 mutex_init(&wdev->mtx);
685                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
686                 INIT_LIST_HEAD(&wdev->event_list);
687                 spin_lock_init(&wdev->event_lock);
688                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
689                 spin_lock_init(&wdev->mgmt_registrations_lock);
690
691                 mutex_lock(&rdev->devlist_mtx);
692                 list_add_rcu(&wdev->list, &rdev->netdev_list);
693                 rdev->devlist_generation++;
694                 /* can only change netns with wiphy */
695                 dev->features |= NETIF_F_NETNS_LOCAL;
696
697                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
698                                       "phy80211")) {
699                         printk(KERN_ERR "wireless: failed to add phy80211 "
700                                 "symlink to netdev!\n");
701                 }
702                 wdev->netdev = dev;
703                 wdev->sme_state = CFG80211_SME_IDLE;
704                 mutex_unlock(&rdev->devlist_mtx);
705 #ifdef CONFIG_CFG80211_WEXT
706                 wdev->wext.default_key = -1;
707                 wdev->wext.default_mgmt_key = -1;
708                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
709 #endif
710
711                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
712                         wdev->ps = true;
713                 else
714                         wdev->ps = false;
715                 /* allow mac80211 to determine the timeout */
716                 wdev->ps_timeout = -1;
717                 if (rdev->ops->set_power_mgmt)
718                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
719                                                       wdev->ps,
720                                                       wdev->ps_timeout)) {
721                                 /* assume this means it's off */
722                                 wdev->ps = false;
723                         }
724
725                 if (!dev->ethtool_ops)
726                         dev->ethtool_ops = &cfg80211_ethtool_ops;
727
728                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
729                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
730                         dev->priv_flags |= IFF_DONT_BRIDGE;
731                 break;
732         case NETDEV_GOING_DOWN:
733                 switch (wdev->iftype) {
734                 case NL80211_IFTYPE_ADHOC:
735                         cfg80211_leave_ibss(rdev, dev, true);
736                         break;
737                 case NL80211_IFTYPE_STATION:
738                         wdev_lock(wdev);
739 #ifdef CONFIG_CFG80211_WEXT
740                         kfree(wdev->wext.ie);
741                         wdev->wext.ie = NULL;
742                         wdev->wext.ie_len = 0;
743                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
744 #endif
745                         __cfg80211_disconnect(rdev, dev,
746                                               WLAN_REASON_DEAUTH_LEAVING, true);
747                         cfg80211_mlme_down(rdev, dev);
748                         wdev_unlock(wdev);
749                         break;
750                 default:
751                         break;
752                 }
753                 break;
754         case NETDEV_DOWN:
755                 dev_hold(dev);
756                 queue_work(cfg80211_wq, &wdev->cleanup_work);
757                 break;
758         case NETDEV_UP:
759                 /*
760                  * If we have a really quick DOWN/UP succession we may
761                  * have this work still pending ... cancel it and see
762                  * if it was pending, in which case we need to account
763                  * for some of the work it would have done.
764                  */
765                 if (cancel_work_sync(&wdev->cleanup_work)) {
766                         mutex_lock(&rdev->devlist_mtx);
767                         rdev->opencount--;
768                         mutex_unlock(&rdev->devlist_mtx);
769                         dev_put(dev);
770                 }
771                 cfg80211_lock_rdev(rdev);
772                 mutex_lock(&rdev->devlist_mtx);
773 #ifdef CONFIG_CFG80211_WEXT
774                 wdev_lock(wdev);
775                 switch (wdev->iftype) {
776                 case NL80211_IFTYPE_ADHOC:
777                         cfg80211_ibss_wext_join(rdev, wdev);
778                         break;
779                 case NL80211_IFTYPE_STATION:
780                         cfg80211_mgd_wext_connect(rdev, wdev);
781                         break;
782                 default:
783                         break;
784                 }
785                 wdev_unlock(wdev);
786 #endif
787                 rdev->opencount++;
788                 mutex_unlock(&rdev->devlist_mtx);
789                 cfg80211_unlock_rdev(rdev);
790                 break;
791         case NETDEV_UNREGISTER:
792                 /*
793                  * NB: cannot take rdev->mtx here because this may be
794                  * called within code protected by it when interfaces
795                  * are removed with nl80211.
796                  */
797                 mutex_lock(&rdev->devlist_mtx);
798                 /*
799                  * It is possible to get NETDEV_UNREGISTER
800                  * multiple times. To detect that, check
801                  * that the interface is still on the list
802                  * of registered interfaces, and only then
803                  * remove and clean it up.
804                  */
805                 if (!list_empty(&wdev->list)) {
806                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
807                         list_del_rcu(&wdev->list);
808                         rdev->devlist_generation++;
809                         cfg80211_mlme_purge_registrations(wdev);
810 #ifdef CONFIG_CFG80211_WEXT
811                         kfree(wdev->wext.keys);
812 #endif
813                 }
814                 mutex_unlock(&rdev->devlist_mtx);
815                 /*
816                  * synchronise (so that we won't find this netdev
817                  * from other code any more) and then clear the list
818                  * head so that the above code can safely check for
819                  * !list_empty() to avoid double-cleanup.
820                  */
821                 synchronize_rcu();
822                 INIT_LIST_HEAD(&wdev->list);
823                 break;
824         case NETDEV_PRE_UP:
825                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
826                         return notifier_from_errno(-EOPNOTSUPP);
827                 if (rfkill_blocked(rdev->rfkill))
828                         return notifier_from_errno(-ERFKILL);
829                 break;
830         }
831
832         return NOTIFY_DONE;
833 }
834
835 static struct notifier_block cfg80211_netdev_notifier = {
836         .notifier_call = cfg80211_netdev_notifier_call,
837 };
838
839 static void __net_exit cfg80211_pernet_exit(struct net *net)
840 {
841         struct cfg80211_registered_device *rdev;
842
843         rtnl_lock();
844         mutex_lock(&cfg80211_mutex);
845         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
846                 if (net_eq(wiphy_net(&rdev->wiphy), net))
847                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
848         }
849         mutex_unlock(&cfg80211_mutex);
850         rtnl_unlock();
851 }
852
853 static struct pernet_operations cfg80211_pernet_ops = {
854         .exit = cfg80211_pernet_exit,
855 };
856
857 static int __init cfg80211_init(void)
858 {
859         int err;
860
861         err = register_pernet_device(&cfg80211_pernet_ops);
862         if (err)
863                 goto out_fail_pernet;
864
865         err = wiphy_sysfs_init();
866         if (err)
867                 goto out_fail_sysfs;
868
869         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
870         if (err)
871                 goto out_fail_notifier;
872
873         err = nl80211_init();
874         if (err)
875                 goto out_fail_nl80211;
876
877         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
878
879         err = regulatory_init();
880         if (err)
881                 goto out_fail_reg;
882
883         cfg80211_wq = create_singlethread_workqueue("cfg80211");
884         if (!cfg80211_wq)
885                 goto out_fail_wq;
886
887         return 0;
888
889 out_fail_wq:
890         regulatory_exit();
891 out_fail_reg:
892         debugfs_remove(ieee80211_debugfs_dir);
893 out_fail_nl80211:
894         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
895 out_fail_notifier:
896         wiphy_sysfs_exit();
897 out_fail_sysfs:
898         unregister_pernet_device(&cfg80211_pernet_ops);
899 out_fail_pernet:
900         return err;
901 }
902 subsys_initcall(cfg80211_init);
903
904 static void __exit cfg80211_exit(void)
905 {
906         debugfs_remove(ieee80211_debugfs_dir);
907         nl80211_exit();
908         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
909         wiphy_sysfs_exit();
910         regulatory_exit();
911         unregister_pernet_device(&cfg80211_pernet_ops);
912         destroy_workqueue(cfg80211_wq);
913 }
914 module_exit(cfg80211_exit);
915
916 static int ___wiphy_printk(const char *level, const struct wiphy *wiphy,
917                            struct va_format *vaf)
918 {
919         if (!wiphy)
920                 return printk("%s(NULL wiphy *): %pV", level, vaf);
921
922         return printk("%s%s: %pV", level, wiphy_name(wiphy), vaf);
923 }
924
925 int __wiphy_printk(const char *level, const struct wiphy *wiphy,
926                    const char *fmt, ...)
927 {
928         struct va_format vaf;
929         va_list args;
930         int r;
931
932         va_start(args, fmt);
933
934         vaf.fmt = fmt;
935         vaf.va = &args;
936
937         r = ___wiphy_printk(level, wiphy, &vaf);
938         va_end(args);
939
940         return r;
941 }
942 EXPORT_SYMBOL(__wiphy_printk);
943
944 #define define_wiphy_printk_level(func, kern_level)             \
945 int func(const struct wiphy *wiphy, const char *fmt, ...)       \
946 {                                                               \
947         struct va_format vaf;                                   \
948         va_list args;                                           \
949         int r;                                                  \
950                                                                 \
951         va_start(args, fmt);                                    \
952                                                                 \
953         vaf.fmt = fmt;                                          \
954         vaf.va = &args;                                         \
955                                                                 \
956         r = ___wiphy_printk(kern_level, wiphy, &vaf);           \
957         va_end(args);                                           \
958                                                                 \
959         return r;                                               \
960 }                                                               \
961 EXPORT_SYMBOL(func);
962
963 define_wiphy_printk_level(wiphy_debug, KERN_DEBUG);