cfg80211: Use capability info to detect mesh beacons.
[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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/if.h>
10 #include <linux/module.h>
11 #include <linux/err.h>
12 #include <linux/list.h>
13 #include <linux/slab.h>
14 #include <linux/nl80211.h>
15 #include <linux/debugfs.h>
16 #include <linux/notifier.h>
17 #include <linux/device.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/sched.h>
21 #include <net/genetlink.h>
22 #include <net/cfg80211.h>
23 #include "nl80211.h"
24 #include "core.h"
25 #include "sysfs.h"
26 #include "debugfs.h"
27 #include "wext-compat.h"
28 #include "ethtool.h"
29
30 /* name for sysfs, %d is appended */
31 #define PHY_NAME "phy"
32
33 MODULE_AUTHOR("Johannes Berg");
34 MODULE_LICENSE("GPL");
35 MODULE_DESCRIPTION("wireless configuration support");
36
37 /* RCU-protected (and cfg80211_mutex for writers) */
38 LIST_HEAD(cfg80211_rdev_list);
39 int cfg80211_rdev_list_generation;
40
41 DEFINE_MUTEX(cfg80211_mutex);
42
43 /* for debugfs */
44 static struct dentry *ieee80211_debugfs_dir;
45
46 /* for the cleanup, scan and event works */
47 struct workqueue_struct *cfg80211_wq;
48
49 static bool cfg80211_disable_40mhz_24ghz;
50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
52                  "Disable 40MHz support in the 2.4GHz band");
53
54 /* requires cfg80211_mutex to be held! */
55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
56 {
57         struct cfg80211_registered_device *result = NULL, *rdev;
58
59         if (!wiphy_idx_valid(wiphy_idx))
60                 return NULL;
61
62         assert_cfg80211_lock();
63
64         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
65                 if (rdev->wiphy_idx == wiphy_idx) {
66                         result = rdev;
67                         break;
68                 }
69         }
70
71         return result;
72 }
73
74 int get_wiphy_idx(struct wiphy *wiphy)
75 {
76         struct cfg80211_registered_device *rdev;
77         if (!wiphy)
78                 return WIPHY_IDX_STALE;
79         rdev = wiphy_to_dev(wiphy);
80         return rdev->wiphy_idx;
81 }
82
83 /* requires cfg80211_rdev_mutex to be held! */
84 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
85 {
86         struct cfg80211_registered_device *rdev;
87
88         if (!wiphy_idx_valid(wiphy_idx))
89                 return NULL;
90
91         assert_cfg80211_lock();
92
93         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
94         if (!rdev)
95                 return NULL;
96         return &rdev->wiphy;
97 }
98
99 /* requires cfg80211_mutex to be held! */
100 struct cfg80211_registered_device *
101 __cfg80211_rdev_from_info(struct genl_info *info)
102 {
103         int ifindex;
104         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
105         struct net_device *dev;
106         int err = -EINVAL;
107
108         assert_cfg80211_lock();
109
110         if (info->attrs[NL80211_ATTR_WIPHY]) {
111                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
112                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
113                 err = -ENODEV;
114         }
115
116         if (info->attrs[NL80211_ATTR_IFINDEX]) {
117                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
118                 dev = dev_get_by_index(genl_info_net(info), ifindex);
119                 if (dev) {
120                         if (dev->ieee80211_ptr)
121                                 byifidx =
122                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
123                         dev_put(dev);
124                 }
125                 err = -ENODEV;
126         }
127
128         if (bywiphyidx && byifidx) {
129                 if (bywiphyidx != byifidx)
130                         return ERR_PTR(-EINVAL);
131                 else
132                         return bywiphyidx; /* == byifidx */
133         }
134         if (bywiphyidx)
135                 return bywiphyidx;
136
137         if (byifidx)
138                 return byifidx;
139
140         return ERR_PTR(err);
141 }
142
143 struct cfg80211_registered_device *
144 cfg80211_get_dev_from_info(struct genl_info *info)
145 {
146         struct cfg80211_registered_device *rdev;
147
148         mutex_lock(&cfg80211_mutex);
149         rdev = __cfg80211_rdev_from_info(info);
150
151         /* if it is not an error we grab the lock on
152          * it to assure it won't be going away while
153          * we operate on it */
154         if (!IS_ERR(rdev))
155                 mutex_lock(&rdev->mtx);
156
157         mutex_unlock(&cfg80211_mutex);
158
159         return rdev;
160 }
161
162 struct cfg80211_registered_device *
163 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
164 {
165         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
166         struct net_device *dev;
167
168         mutex_lock(&cfg80211_mutex);
169         dev = dev_get_by_index(net, ifindex);
170         if (!dev)
171                 goto out;
172         if (dev->ieee80211_ptr) {
173                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
174                 mutex_lock(&rdev->mtx);
175         } else
176                 rdev = ERR_PTR(-ENODEV);
177         dev_put(dev);
178  out:
179         mutex_unlock(&cfg80211_mutex);
180         return rdev;
181 }
182
183 /* requires cfg80211_mutex to be held */
184 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
185                         char *newname)
186 {
187         struct cfg80211_registered_device *rdev2;
188         int wiphy_idx, taken = -1, result, digits;
189
190         assert_cfg80211_lock();
191
192         /* prohibit calling the thing phy%d when %d is not its number */
193         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
194         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
195                 /* count number of places needed to print wiphy_idx */
196                 digits = 1;
197                 while (wiphy_idx /= 10)
198                         digits++;
199                 /*
200                  * deny the name if it is phy<idx> where <idx> is printed
201                  * without leading zeroes. taken == strlen(newname) here
202                  */
203                 if (taken == strlen(PHY_NAME) + digits)
204                         return -EINVAL;
205         }
206
207
208         /* Ignore nop renames */
209         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
210                 return 0;
211
212         /* Ensure another device does not already have this name. */
213         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
214                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
215                         return -EINVAL;
216
217         result = device_rename(&rdev->wiphy.dev, newname);
218         if (result)
219                 return result;
220
221         if (rdev->wiphy.debugfsdir &&
222             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
223                             rdev->wiphy.debugfsdir,
224                             rdev->wiphy.debugfsdir->d_parent,
225                             newname))
226                 pr_err("failed to rename debugfs dir to %s!\n", newname);
227
228         nl80211_notify_dev_rename(rdev);
229
230         return 0;
231 }
232
233 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
234                           struct net *net)
235 {
236         struct wireless_dev *wdev;
237         int err = 0;
238
239         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
240                 return -EOPNOTSUPP;
241
242         list_for_each_entry(wdev, &rdev->netdev_list, list) {
243                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
244                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
245                 if (err)
246                         break;
247                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
248         }
249
250         if (err) {
251                 /* failed -- clean up to old netns */
252                 net = wiphy_net(&rdev->wiphy);
253
254                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
255                                                      list) {
256                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
257                         err = dev_change_net_namespace(wdev->netdev, net,
258                                                         "wlan%d");
259                         WARN_ON(err);
260                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
261                 }
262
263                 return err;
264         }
265
266         wiphy_net_set(&rdev->wiphy, net);
267
268         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
269         WARN_ON(err);
270
271         return 0;
272 }
273
274 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
275 {
276         struct cfg80211_registered_device *rdev = data;
277
278         rdev->ops->rfkill_poll(&rdev->wiphy);
279 }
280
281 static int cfg80211_rfkill_set_block(void *data, bool blocked)
282 {
283         struct cfg80211_registered_device *rdev = data;
284         struct wireless_dev *wdev;
285
286         if (!blocked)
287                 return 0;
288
289         rtnl_lock();
290         mutex_lock(&rdev->devlist_mtx);
291
292         list_for_each_entry(wdev, &rdev->netdev_list, list)
293                 dev_close(wdev->netdev);
294
295         mutex_unlock(&rdev->devlist_mtx);
296         rtnl_unlock();
297
298         return 0;
299 }
300
301 static void cfg80211_rfkill_sync_work(struct work_struct *work)
302 {
303         struct cfg80211_registered_device *rdev;
304
305         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
306         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
307 }
308
309 static void cfg80211_event_work(struct work_struct *work)
310 {
311         struct cfg80211_registered_device *rdev;
312
313         rdev = container_of(work, struct cfg80211_registered_device,
314                             event_work);
315
316         rtnl_lock();
317         cfg80211_lock_rdev(rdev);
318
319         cfg80211_process_rdev_events(rdev);
320         cfg80211_unlock_rdev(rdev);
321         rtnl_unlock();
322 }
323
324 /* exported functions */
325
326 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
327 {
328         static int wiphy_counter;
329
330         struct cfg80211_registered_device *rdev;
331         int alloc_size;
332
333         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
334         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
335         WARN_ON(ops->connect && !ops->disconnect);
336         WARN_ON(ops->join_ibss && !ops->leave_ibss);
337         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
338         WARN_ON(ops->add_station && !ops->del_station);
339         WARN_ON(ops->add_mpath && !ops->del_mpath);
340         WARN_ON(ops->join_mesh && !ops->leave_mesh);
341
342         alloc_size = sizeof(*rdev) + sizeof_priv;
343
344         rdev = kzalloc(alloc_size, GFP_KERNEL);
345         if (!rdev)
346                 return NULL;
347
348         rdev->ops = ops;
349
350         mutex_lock(&cfg80211_mutex);
351
352         rdev->wiphy_idx = wiphy_counter++;
353
354         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
355                 wiphy_counter--;
356                 mutex_unlock(&cfg80211_mutex);
357                 /* ugh, wrapped! */
358                 kfree(rdev);
359                 return NULL;
360         }
361
362         mutex_unlock(&cfg80211_mutex);
363
364         /* give it a proper name */
365         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
366
367         mutex_init(&rdev->mtx);
368         mutex_init(&rdev->devlist_mtx);
369         INIT_LIST_HEAD(&rdev->netdev_list);
370         spin_lock_init(&rdev->bss_lock);
371         INIT_LIST_HEAD(&rdev->bss_list);
372         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
373
374 #ifdef CONFIG_CFG80211_WEXT
375         rdev->wiphy.wext = &cfg80211_wext_handler;
376 #endif
377
378         device_initialize(&rdev->wiphy.dev);
379         rdev->wiphy.dev.class = &ieee80211_class;
380         rdev->wiphy.dev.platform_data = rdev;
381
382 #ifdef CONFIG_CFG80211_DEFAULT_PS
383         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
384 #endif
385
386         wiphy_net_set(&rdev->wiphy, &init_net);
387
388         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
389         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
390                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
391                                    &rdev->rfkill_ops, rdev);
392
393         if (!rdev->rfkill) {
394                 kfree(rdev);
395                 return NULL;
396         }
397
398         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
399         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
400         INIT_WORK(&rdev->event_work, cfg80211_event_work);
401
402         init_waitqueue_head(&rdev->dev_wait);
403
404         /*
405          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
406          * Fragmentation and RTS threshold are disabled by default with the
407          * special -1 value.
408          */
409         rdev->wiphy.retry_short = 7;
410         rdev->wiphy.retry_long = 4;
411         rdev->wiphy.frag_threshold = (u32) -1;
412         rdev->wiphy.rts_threshold = (u32) -1;
413         rdev->wiphy.coverage_class = 0;
414
415         return &rdev->wiphy;
416 }
417 EXPORT_SYMBOL(wiphy_new);
418
419 int wiphy_register(struct wiphy *wiphy)
420 {
421         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
422         int res;
423         enum ieee80211_band band;
424         struct ieee80211_supported_band *sband;
425         bool have_band = false;
426         int i;
427         u16 ifmodes = wiphy->interface_modes;
428
429         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
430                 return -EINVAL;
431
432         if (WARN_ON(wiphy->addresses &&
433                     !is_zero_ether_addr(wiphy->perm_addr) &&
434                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
435                            ETH_ALEN)))
436                 return -EINVAL;
437
438         if (wiphy->addresses)
439                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
440
441         /* sanity check ifmodes */
442         WARN_ON(!ifmodes);
443         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
444         if (WARN_ON(ifmodes != wiphy->interface_modes))
445                 wiphy->interface_modes = ifmodes;
446
447         /* sanity check supported bands/channels */
448         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
449                 sband = wiphy->bands[band];
450                 if (!sband)
451                         continue;
452
453                 sband->band = band;
454
455                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
456                         return -EINVAL;
457
458                 /*
459                  * Since cfg80211_disable_40mhz_24ghz is global, we can
460                  * modify the sband's ht data even if the driver uses a
461                  * global structure for that.
462                  */
463                 if (cfg80211_disable_40mhz_24ghz &&
464                     band == IEEE80211_BAND_2GHZ &&
465                     sband->ht_cap.ht_supported) {
466                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
467                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
468                 }
469
470                 /*
471                  * Since we use a u32 for rate bitmaps in
472                  * ieee80211_get_response_rate, we cannot
473                  * have more than 32 legacy rates.
474                  */
475                 if (WARN_ON(sband->n_bitrates > 32))
476                         return -EINVAL;
477
478                 for (i = 0; i < sband->n_channels; i++) {
479                         sband->channels[i].orig_flags =
480                                 sband->channels[i].flags;
481                         sband->channels[i].orig_mag =
482                                 sband->channels[i].max_antenna_gain;
483                         sband->channels[i].orig_mpwr =
484                                 sband->channels[i].max_power;
485                         sband->channels[i].band = band;
486                 }
487
488                 have_band = true;
489         }
490
491         if (!have_band) {
492                 WARN_ON(1);
493                 return -EINVAL;
494         }
495
496         if (rdev->wiphy.wowlan.n_patterns) {
497                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
498                             rdev->wiphy.wowlan.pattern_min_len >
499                             rdev->wiphy.wowlan.pattern_max_len))
500                         return -EINVAL;
501         }
502
503         /* check and set up bitrates */
504         ieee80211_set_bitrate_flags(wiphy);
505
506         mutex_lock(&cfg80211_mutex);
507
508         res = device_add(&rdev->wiphy.dev);
509         if (res) {
510                 mutex_unlock(&cfg80211_mutex);
511                 return res;
512         }
513
514         /* set up regulatory info */
515         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
516
517         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
518         cfg80211_rdev_list_generation++;
519
520         /* add to debugfs */
521         rdev->wiphy.debugfsdir =
522                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
523                                    ieee80211_debugfs_dir);
524         if (IS_ERR(rdev->wiphy.debugfsdir))
525                 rdev->wiphy.debugfsdir = NULL;
526
527         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
528                 struct regulatory_request request;
529
530                 request.wiphy_idx = get_wiphy_idx(wiphy);
531                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
532                 request.alpha2[0] = '9';
533                 request.alpha2[1] = '9';
534
535                 nl80211_send_reg_change_event(&request);
536         }
537
538         cfg80211_debugfs_rdev_add(rdev);
539         mutex_unlock(&cfg80211_mutex);
540
541         /*
542          * due to a locking dependency this has to be outside of the
543          * cfg80211_mutex lock
544          */
545         res = rfkill_register(rdev->rfkill);
546         if (res)
547                 goto out_rm_dev;
548
549         return 0;
550
551 out_rm_dev:
552         device_del(&rdev->wiphy.dev);
553         return res;
554 }
555 EXPORT_SYMBOL(wiphy_register);
556
557 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
558 {
559         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
560
561         if (!rdev->ops->rfkill_poll)
562                 return;
563         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
564         rfkill_resume_polling(rdev->rfkill);
565 }
566 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
567
568 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
569 {
570         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
571
572         rfkill_pause_polling(rdev->rfkill);
573 }
574 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
575
576 void wiphy_unregister(struct wiphy *wiphy)
577 {
578         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
579
580         rfkill_unregister(rdev->rfkill);
581
582         /* protect the device list */
583         mutex_lock(&cfg80211_mutex);
584
585         wait_event(rdev->dev_wait, ({
586                 int __count;
587                 mutex_lock(&rdev->devlist_mtx);
588                 __count = rdev->opencount;
589                 mutex_unlock(&rdev->devlist_mtx);
590                 __count == 0;}));
591
592         mutex_lock(&rdev->devlist_mtx);
593         BUG_ON(!list_empty(&rdev->netdev_list));
594         mutex_unlock(&rdev->devlist_mtx);
595
596         /*
597          * First remove the hardware from everywhere, this makes
598          * it impossible to find from userspace.
599          */
600         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
601         list_del_rcu(&rdev->list);
602         synchronize_rcu();
603
604         /*
605          * Try to grab rdev->mtx. If a command is still in progress,
606          * hopefully the driver will refuse it since it's tearing
607          * down the device already. We wait for this command to complete
608          * before unlinking the item from the list.
609          * Note: as codified by the BUG_ON above we cannot get here if
610          * a virtual interface is still present. Hence, we can only get
611          * to lock contention here if userspace issues a command that
612          * identified the hardware by wiphy index.
613          */
614         cfg80211_lock_rdev(rdev);
615         /* nothing */
616         cfg80211_unlock_rdev(rdev);
617
618         /* If this device got a regulatory hint tell core its
619          * free to listen now to a new shiny device regulatory hint */
620         reg_device_remove(wiphy);
621
622         cfg80211_rdev_list_generation++;
623         device_del(&rdev->wiphy.dev);
624
625         mutex_unlock(&cfg80211_mutex);
626
627         flush_work(&rdev->scan_done_wk);
628         cancel_work_sync(&rdev->conn_work);
629         flush_work(&rdev->event_work);
630 }
631 EXPORT_SYMBOL(wiphy_unregister);
632
633 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
634 {
635         struct cfg80211_internal_bss *scan, *tmp;
636         rfkill_destroy(rdev->rfkill);
637         mutex_destroy(&rdev->mtx);
638         mutex_destroy(&rdev->devlist_mtx);
639         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
640                 cfg80211_put_bss(&scan->pub);
641         cfg80211_rdev_free_wowlan(rdev);
642         kfree(rdev);
643 }
644
645 void wiphy_free(struct wiphy *wiphy)
646 {
647         put_device(&wiphy->dev);
648 }
649 EXPORT_SYMBOL(wiphy_free);
650
651 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
652 {
653         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
654
655         if (rfkill_set_hw_state(rdev->rfkill, blocked))
656                 schedule_work(&rdev->rfkill_sync);
657 }
658 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
659
660 static void wdev_cleanup_work(struct work_struct *work)
661 {
662         struct wireless_dev *wdev;
663         struct cfg80211_registered_device *rdev;
664
665         wdev = container_of(work, struct wireless_dev, cleanup_work);
666         rdev = wiphy_to_dev(wdev->wiphy);
667
668         cfg80211_lock_rdev(rdev);
669
670         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
671                 rdev->scan_req->aborted = true;
672                 ___cfg80211_scan_done(rdev, true);
673         }
674
675         cfg80211_unlock_rdev(rdev);
676
677         mutex_lock(&rdev->devlist_mtx);
678         rdev->opencount--;
679         mutex_unlock(&rdev->devlist_mtx);
680         wake_up(&rdev->dev_wait);
681
682         dev_put(wdev->netdev);
683 }
684
685 static struct device_type wiphy_type = {
686         .name   = "wlan",
687 };
688
689 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
690                                          unsigned long state,
691                                          void *ndev)
692 {
693         struct net_device *dev = ndev;
694         struct wireless_dev *wdev = dev->ieee80211_ptr;
695         struct cfg80211_registered_device *rdev;
696
697         if (!wdev)
698                 return NOTIFY_DONE;
699
700         rdev = wiphy_to_dev(wdev->wiphy);
701
702         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
703
704         switch (state) {
705         case NETDEV_POST_INIT:
706                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
707                 break;
708         case NETDEV_REGISTER:
709                 /*
710                  * NB: cannot take rdev->mtx here because this may be
711                  * called within code protected by it when interfaces
712                  * are added with nl80211.
713                  */
714                 mutex_init(&wdev->mtx);
715                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
716                 INIT_LIST_HEAD(&wdev->event_list);
717                 spin_lock_init(&wdev->event_lock);
718                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
719                 spin_lock_init(&wdev->mgmt_registrations_lock);
720
721                 mutex_lock(&rdev->devlist_mtx);
722                 list_add_rcu(&wdev->list, &rdev->netdev_list);
723                 rdev->devlist_generation++;
724                 /* can only change netns with wiphy */
725                 dev->features |= NETIF_F_NETNS_LOCAL;
726
727                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
728                                       "phy80211")) {
729                         pr_err("failed to add phy80211 symlink to netdev!\n");
730                 }
731                 wdev->netdev = dev;
732                 wdev->sme_state = CFG80211_SME_IDLE;
733                 mutex_unlock(&rdev->devlist_mtx);
734 #ifdef CONFIG_CFG80211_WEXT
735                 wdev->wext.default_key = -1;
736                 wdev->wext.default_mgmt_key = -1;
737                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
738 #endif
739
740                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
741                         wdev->ps = true;
742                 else
743                         wdev->ps = false;
744                 /* allow mac80211 to determine the timeout */
745                 wdev->ps_timeout = -1;
746
747                 if (!dev->ethtool_ops)
748                         dev->ethtool_ops = &cfg80211_ethtool_ops;
749
750                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
751                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
752                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
753                         dev->priv_flags |= IFF_DONT_BRIDGE;
754                 break;
755         case NETDEV_GOING_DOWN:
756                 switch (wdev->iftype) {
757                 case NL80211_IFTYPE_ADHOC:
758                         cfg80211_leave_ibss(rdev, dev, true);
759                         break;
760                 case NL80211_IFTYPE_P2P_CLIENT:
761                 case NL80211_IFTYPE_STATION:
762                         wdev_lock(wdev);
763 #ifdef CONFIG_CFG80211_WEXT
764                         kfree(wdev->wext.ie);
765                         wdev->wext.ie = NULL;
766                         wdev->wext.ie_len = 0;
767                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
768 #endif
769                         __cfg80211_disconnect(rdev, dev,
770                                               WLAN_REASON_DEAUTH_LEAVING, true);
771                         cfg80211_mlme_down(rdev, dev);
772                         wdev_unlock(wdev);
773                         break;
774                 case NL80211_IFTYPE_MESH_POINT:
775                         cfg80211_leave_mesh(rdev, dev);
776                         break;
777                 default:
778                         break;
779                 }
780                 break;
781         case NETDEV_DOWN:
782                 dev_hold(dev);
783                 queue_work(cfg80211_wq, &wdev->cleanup_work);
784                 break;
785         case NETDEV_UP:
786                 /*
787                  * If we have a really quick DOWN/UP succession we may
788                  * have this work still pending ... cancel it and see
789                  * if it was pending, in which case we need to account
790                  * for some of the work it would have done.
791                  */
792                 if (cancel_work_sync(&wdev->cleanup_work)) {
793                         mutex_lock(&rdev->devlist_mtx);
794                         rdev->opencount--;
795                         mutex_unlock(&rdev->devlist_mtx);
796                         dev_put(dev);
797                 }
798                 cfg80211_lock_rdev(rdev);
799                 mutex_lock(&rdev->devlist_mtx);
800                 wdev_lock(wdev);
801                 switch (wdev->iftype) {
802 #ifdef CONFIG_CFG80211_WEXT
803                 case NL80211_IFTYPE_ADHOC:
804                         cfg80211_ibss_wext_join(rdev, wdev);
805                         break;
806                 case NL80211_IFTYPE_STATION:
807                         cfg80211_mgd_wext_connect(rdev, wdev);
808                         break;
809 #endif
810 #ifdef CONFIG_MAC80211_MESH
811                 case NL80211_IFTYPE_MESH_POINT:
812                         {
813                                 /* backward compat code... */
814                                 struct mesh_setup setup;
815                                 memcpy(&setup, &default_mesh_setup,
816                                                 sizeof(setup));
817                                  /* back compat only needed for mesh_id */
818                                 setup.mesh_id = wdev->ssid;
819                                 setup.mesh_id_len = wdev->mesh_id_up_len;
820                                 if (wdev->mesh_id_up_len)
821                                         __cfg80211_join_mesh(rdev, dev,
822                                                         &setup,
823                                                         &default_mesh_config);
824                                 break;
825                         }
826 #endif
827                 default:
828                         break;
829                 }
830                 wdev_unlock(wdev);
831                 rdev->opencount++;
832                 mutex_unlock(&rdev->devlist_mtx);
833                 cfg80211_unlock_rdev(rdev);
834
835                 /*
836                  * Configure power management to the driver here so that its
837                  * correctly set also after interface type changes etc.
838                  */
839                 if (wdev->iftype == NL80211_IFTYPE_STATION &&
840                     rdev->ops->set_power_mgmt)
841                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
842                                                       wdev->ps,
843                                                       wdev->ps_timeout)) {
844                                 /* assume this means it's off */
845                                 wdev->ps = false;
846                         }
847                 break;
848         case NETDEV_UNREGISTER:
849                 /*
850                  * NB: cannot take rdev->mtx here because this may be
851                  * called within code protected by it when interfaces
852                  * are removed with nl80211.
853                  */
854                 mutex_lock(&rdev->devlist_mtx);
855                 /*
856                  * It is possible to get NETDEV_UNREGISTER
857                  * multiple times. To detect that, check
858                  * that the interface is still on the list
859                  * of registered interfaces, and only then
860                  * remove and clean it up.
861                  */
862                 if (!list_empty(&wdev->list)) {
863                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
864                         list_del_rcu(&wdev->list);
865                         rdev->devlist_generation++;
866                         cfg80211_mlme_purge_registrations(wdev);
867 #ifdef CONFIG_CFG80211_WEXT
868                         kfree(wdev->wext.keys);
869 #endif
870                 }
871                 mutex_unlock(&rdev->devlist_mtx);
872                 /*
873                  * synchronise (so that we won't find this netdev
874                  * from other code any more) and then clear the list
875                  * head so that the above code can safely check for
876                  * !list_empty() to avoid double-cleanup.
877                  */
878                 synchronize_rcu();
879                 INIT_LIST_HEAD(&wdev->list);
880                 break;
881         case NETDEV_PRE_UP:
882                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
883                         return notifier_from_errno(-EOPNOTSUPP);
884                 if (rfkill_blocked(rdev->rfkill))
885                         return notifier_from_errno(-ERFKILL);
886                 break;
887         }
888
889         return NOTIFY_DONE;
890 }
891
892 static struct notifier_block cfg80211_netdev_notifier = {
893         .notifier_call = cfg80211_netdev_notifier_call,
894 };
895
896 static void __net_exit cfg80211_pernet_exit(struct net *net)
897 {
898         struct cfg80211_registered_device *rdev;
899
900         rtnl_lock();
901         mutex_lock(&cfg80211_mutex);
902         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
903                 if (net_eq(wiphy_net(&rdev->wiphy), net))
904                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
905         }
906         mutex_unlock(&cfg80211_mutex);
907         rtnl_unlock();
908 }
909
910 static struct pernet_operations cfg80211_pernet_ops = {
911         .exit = cfg80211_pernet_exit,
912 };
913
914 static int __init cfg80211_init(void)
915 {
916         int err;
917
918         err = register_pernet_device(&cfg80211_pernet_ops);
919         if (err)
920                 goto out_fail_pernet;
921
922         err = wiphy_sysfs_init();
923         if (err)
924                 goto out_fail_sysfs;
925
926         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
927         if (err)
928                 goto out_fail_notifier;
929
930         err = nl80211_init();
931         if (err)
932                 goto out_fail_nl80211;
933
934         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
935
936         err = regulatory_init();
937         if (err)
938                 goto out_fail_reg;
939
940         cfg80211_wq = create_singlethread_workqueue("cfg80211");
941         if (!cfg80211_wq)
942                 goto out_fail_wq;
943
944         return 0;
945
946 out_fail_wq:
947         regulatory_exit();
948 out_fail_reg:
949         debugfs_remove(ieee80211_debugfs_dir);
950 out_fail_nl80211:
951         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
952 out_fail_notifier:
953         wiphy_sysfs_exit();
954 out_fail_sysfs:
955         unregister_pernet_device(&cfg80211_pernet_ops);
956 out_fail_pernet:
957         return err;
958 }
959 subsys_initcall(cfg80211_init);
960
961 static void __exit cfg80211_exit(void)
962 {
963         debugfs_remove(ieee80211_debugfs_dir);
964         nl80211_exit();
965         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
966         wiphy_sysfs_exit();
967         regulatory_exit();
968         unregister_pernet_device(&cfg80211_pernet_ops);
969         destroy_workqueue(cfg80211_wq);
970 }
971 module_exit(cfg80211_exit);