Merge branch 'master' of github.com:davem330/net
[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         mutex_init(&rdev->sched_scan_mtx);
370         INIT_LIST_HEAD(&rdev->netdev_list);
371         spin_lock_init(&rdev->bss_lock);
372         INIT_LIST_HEAD(&rdev->bss_list);
373         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
374         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
375 #ifdef CONFIG_CFG80211_WEXT
376         rdev->wiphy.wext = &cfg80211_wext_handler;
377 #endif
378
379         device_initialize(&rdev->wiphy.dev);
380         rdev->wiphy.dev.class = &ieee80211_class;
381         rdev->wiphy.dev.platform_data = rdev;
382
383 #ifdef CONFIG_CFG80211_DEFAULT_PS
384         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
385 #endif
386
387         wiphy_net_set(&rdev->wiphy, &init_net);
388
389         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
390         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
391                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
392                                    &rdev->rfkill_ops, rdev);
393
394         if (!rdev->rfkill) {
395                 kfree(rdev);
396                 return NULL;
397         }
398
399         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
400         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
401         INIT_WORK(&rdev->event_work, cfg80211_event_work);
402
403         init_waitqueue_head(&rdev->dev_wait);
404
405         /*
406          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
407          * Fragmentation and RTS threshold are disabled by default with the
408          * special -1 value.
409          */
410         rdev->wiphy.retry_short = 7;
411         rdev->wiphy.retry_long = 4;
412         rdev->wiphy.frag_threshold = (u32) -1;
413         rdev->wiphy.rts_threshold = (u32) -1;
414         rdev->wiphy.coverage_class = 0;
415
416         return &rdev->wiphy;
417 }
418 EXPORT_SYMBOL(wiphy_new);
419
420 static int wiphy_verify_combinations(struct wiphy *wiphy)
421 {
422         const struct ieee80211_iface_combination *c;
423         int i, j;
424
425         /* If we have combinations enforce them */
426         if (wiphy->n_iface_combinations)
427                 wiphy->flags |= WIPHY_FLAG_ENFORCE_COMBINATIONS;
428
429         for (i = 0; i < wiphy->n_iface_combinations; i++) {
430                 u32 cnt = 0;
431                 u16 all_iftypes = 0;
432
433                 c = &wiphy->iface_combinations[i];
434
435                 /* Combinations with just one interface aren't real */
436                 if (WARN_ON(c->max_interfaces < 2))
437                         return -EINVAL;
438
439                 /* Need at least one channel */
440                 if (WARN_ON(!c->num_different_channels))
441                         return -EINVAL;
442
443                 if (WARN_ON(!c->n_limits))
444                         return -EINVAL;
445
446                 for (j = 0; j < c->n_limits; j++) {
447                         u16 types = c->limits[j].types;
448
449                         /*
450                          * interface types shouldn't overlap, this is
451                          * used in cfg80211_can_change_interface()
452                          */
453                         if (WARN_ON(types & all_iftypes))
454                                 return -EINVAL;
455                         all_iftypes |= types;
456
457                         if (WARN_ON(!c->limits[j].max))
458                                 return -EINVAL;
459
460                         /* Shouldn't list software iftypes in combinations! */
461                         if (WARN_ON(wiphy->software_iftypes & types))
462                                 return -EINVAL;
463
464                         cnt += c->limits[j].max;
465                         /*
466                          * Don't advertise an unsupported type
467                          * in a combination.
468                          */
469                         if (WARN_ON((wiphy->interface_modes & types) != types))
470                                 return -EINVAL;
471                 }
472
473                 /* You can't even choose that many! */
474                 if (WARN_ON(cnt < c->max_interfaces))
475                         return -EINVAL;
476         }
477
478         return 0;
479 }
480
481 int wiphy_register(struct wiphy *wiphy)
482 {
483         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
484         int res;
485         enum ieee80211_band band;
486         struct ieee80211_supported_band *sband;
487         bool have_band = false;
488         int i;
489         u16 ifmodes = wiphy->interface_modes;
490
491         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
492                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
493                 return -EINVAL;
494
495         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
496                 return -EINVAL;
497
498         if (WARN_ON(wiphy->addresses &&
499                     !is_zero_ether_addr(wiphy->perm_addr) &&
500                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
501                            ETH_ALEN)))
502                 return -EINVAL;
503
504         if (wiphy->addresses)
505                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
506
507         /* sanity check ifmodes */
508         WARN_ON(!ifmodes);
509         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
510         if (WARN_ON(ifmodes != wiphy->interface_modes))
511                 wiphy->interface_modes = ifmodes;
512
513         res = wiphy_verify_combinations(wiphy);
514         if (res)
515                 return res;
516
517         /* sanity check supported bands/channels */
518         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
519                 sband = wiphy->bands[band];
520                 if (!sband)
521                         continue;
522
523                 sband->band = band;
524
525                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
526                         return -EINVAL;
527
528                 /*
529                  * Since cfg80211_disable_40mhz_24ghz is global, we can
530                  * modify the sband's ht data even if the driver uses a
531                  * global structure for that.
532                  */
533                 if (cfg80211_disable_40mhz_24ghz &&
534                     band == IEEE80211_BAND_2GHZ &&
535                     sband->ht_cap.ht_supported) {
536                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
537                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
538                 }
539
540                 /*
541                  * Since we use a u32 for rate bitmaps in
542                  * ieee80211_get_response_rate, we cannot
543                  * have more than 32 legacy rates.
544                  */
545                 if (WARN_ON(sband->n_bitrates > 32))
546                         return -EINVAL;
547
548                 for (i = 0; i < sband->n_channels; i++) {
549                         sband->channels[i].orig_flags =
550                                 sband->channels[i].flags;
551                         sband->channels[i].orig_mag =
552                                 sband->channels[i].max_antenna_gain;
553                         sband->channels[i].orig_mpwr =
554                                 sband->channels[i].max_power;
555                         sband->channels[i].band = band;
556                 }
557
558                 have_band = true;
559         }
560
561         if (!have_band) {
562                 WARN_ON(1);
563                 return -EINVAL;
564         }
565
566         if (rdev->wiphy.wowlan.n_patterns) {
567                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
568                             rdev->wiphy.wowlan.pattern_min_len >
569                             rdev->wiphy.wowlan.pattern_max_len))
570                         return -EINVAL;
571         }
572
573         /* check and set up bitrates */
574         ieee80211_set_bitrate_flags(wiphy);
575
576         mutex_lock(&cfg80211_mutex);
577
578         res = device_add(&rdev->wiphy.dev);
579         if (res) {
580                 mutex_unlock(&cfg80211_mutex);
581                 return res;
582         }
583
584         /* set up regulatory info */
585         regulatory_update(wiphy, NL80211_REGDOM_SET_BY_CORE);
586
587         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
588         cfg80211_rdev_list_generation++;
589
590         /* add to debugfs */
591         rdev->wiphy.debugfsdir =
592                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
593                                    ieee80211_debugfs_dir);
594         if (IS_ERR(rdev->wiphy.debugfsdir))
595                 rdev->wiphy.debugfsdir = NULL;
596
597         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
598                 struct regulatory_request request;
599
600                 request.wiphy_idx = get_wiphy_idx(wiphy);
601                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
602                 request.alpha2[0] = '9';
603                 request.alpha2[1] = '9';
604
605                 nl80211_send_reg_change_event(&request);
606         }
607
608         cfg80211_debugfs_rdev_add(rdev);
609         mutex_unlock(&cfg80211_mutex);
610
611         /*
612          * due to a locking dependency this has to be outside of the
613          * cfg80211_mutex lock
614          */
615         res = rfkill_register(rdev->rfkill);
616         if (res)
617                 goto out_rm_dev;
618
619         rtnl_lock();
620         rdev->wiphy.registered = true;
621         rtnl_unlock();
622         return 0;
623
624 out_rm_dev:
625         device_del(&rdev->wiphy.dev);
626         return res;
627 }
628 EXPORT_SYMBOL(wiphy_register);
629
630 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
631 {
632         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
633
634         if (!rdev->ops->rfkill_poll)
635                 return;
636         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
637         rfkill_resume_polling(rdev->rfkill);
638 }
639 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
640
641 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
642 {
643         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
644
645         rfkill_pause_polling(rdev->rfkill);
646 }
647 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
648
649 void wiphy_unregister(struct wiphy *wiphy)
650 {
651         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
652
653         rtnl_lock();
654         rdev->wiphy.registered = false;
655         rtnl_unlock();
656
657         rfkill_unregister(rdev->rfkill);
658
659         /* protect the device list */
660         mutex_lock(&cfg80211_mutex);
661
662         wait_event(rdev->dev_wait, ({
663                 int __count;
664                 mutex_lock(&rdev->devlist_mtx);
665                 __count = rdev->opencount;
666                 mutex_unlock(&rdev->devlist_mtx);
667                 __count == 0;}));
668
669         mutex_lock(&rdev->devlist_mtx);
670         BUG_ON(!list_empty(&rdev->netdev_list));
671         mutex_unlock(&rdev->devlist_mtx);
672
673         /*
674          * First remove the hardware from everywhere, this makes
675          * it impossible to find from userspace.
676          */
677         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
678         list_del_rcu(&rdev->list);
679         synchronize_rcu();
680
681         /*
682          * Try to grab rdev->mtx. If a command is still in progress,
683          * hopefully the driver will refuse it since it's tearing
684          * down the device already. We wait for this command to complete
685          * before unlinking the item from the list.
686          * Note: as codified by the BUG_ON above we cannot get here if
687          * a virtual interface is still present. Hence, we can only get
688          * to lock contention here if userspace issues a command that
689          * identified the hardware by wiphy index.
690          */
691         cfg80211_lock_rdev(rdev);
692         /* nothing */
693         cfg80211_unlock_rdev(rdev);
694
695         /* If this device got a regulatory hint tell core its
696          * free to listen now to a new shiny device regulatory hint */
697         reg_device_remove(wiphy);
698
699         cfg80211_rdev_list_generation++;
700         device_del(&rdev->wiphy.dev);
701
702         mutex_unlock(&cfg80211_mutex);
703
704         flush_work(&rdev->scan_done_wk);
705         cancel_work_sync(&rdev->conn_work);
706         flush_work(&rdev->event_work);
707 }
708 EXPORT_SYMBOL(wiphy_unregister);
709
710 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
711 {
712         struct cfg80211_internal_bss *scan, *tmp;
713         rfkill_destroy(rdev->rfkill);
714         mutex_destroy(&rdev->mtx);
715         mutex_destroy(&rdev->devlist_mtx);
716         mutex_destroy(&rdev->sched_scan_mtx);
717         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
718                 cfg80211_put_bss(&scan->pub);
719         cfg80211_rdev_free_wowlan(rdev);
720         kfree(rdev);
721 }
722
723 void wiphy_free(struct wiphy *wiphy)
724 {
725         put_device(&wiphy->dev);
726 }
727 EXPORT_SYMBOL(wiphy_free);
728
729 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
730 {
731         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
732
733         if (rfkill_set_hw_state(rdev->rfkill, blocked))
734                 schedule_work(&rdev->rfkill_sync);
735 }
736 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
737
738 static void wdev_cleanup_work(struct work_struct *work)
739 {
740         struct wireless_dev *wdev;
741         struct cfg80211_registered_device *rdev;
742
743         wdev = container_of(work, struct wireless_dev, cleanup_work);
744         rdev = wiphy_to_dev(wdev->wiphy);
745
746         cfg80211_lock_rdev(rdev);
747
748         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
749                 rdev->scan_req->aborted = true;
750                 ___cfg80211_scan_done(rdev, true);
751         }
752
753         cfg80211_unlock_rdev(rdev);
754
755         mutex_lock(&rdev->sched_scan_mtx);
756
757         if (WARN_ON(rdev->sched_scan_req &&
758                     rdev->sched_scan_req->dev == wdev->netdev)) {
759                 __cfg80211_stop_sched_scan(rdev, false);
760         }
761
762         mutex_unlock(&rdev->sched_scan_mtx);
763
764         mutex_lock(&rdev->devlist_mtx);
765         rdev->opencount--;
766         mutex_unlock(&rdev->devlist_mtx);
767         wake_up(&rdev->dev_wait);
768
769         dev_put(wdev->netdev);
770 }
771
772 static struct device_type wiphy_type = {
773         .name   = "wlan",
774 };
775
776 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
777                                          unsigned long state,
778                                          void *ndev)
779 {
780         struct net_device *dev = ndev;
781         struct wireless_dev *wdev = dev->ieee80211_ptr;
782         struct cfg80211_registered_device *rdev;
783         int ret;
784
785         if (!wdev)
786                 return NOTIFY_DONE;
787
788         rdev = wiphy_to_dev(wdev->wiphy);
789
790         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
791
792         switch (state) {
793         case NETDEV_POST_INIT:
794                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
795                 break;
796         case NETDEV_REGISTER:
797                 /*
798                  * NB: cannot take rdev->mtx here because this may be
799                  * called within code protected by it when interfaces
800                  * are added with nl80211.
801                  */
802                 mutex_init(&wdev->mtx);
803                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
804                 INIT_LIST_HEAD(&wdev->event_list);
805                 spin_lock_init(&wdev->event_lock);
806                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
807                 spin_lock_init(&wdev->mgmt_registrations_lock);
808
809                 mutex_lock(&rdev->devlist_mtx);
810                 list_add_rcu(&wdev->list, &rdev->netdev_list);
811                 rdev->devlist_generation++;
812                 /* can only change netns with wiphy */
813                 dev->features |= NETIF_F_NETNS_LOCAL;
814
815                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
816                                       "phy80211")) {
817                         pr_err("failed to add phy80211 symlink to netdev!\n");
818                 }
819                 wdev->netdev = dev;
820                 wdev->sme_state = CFG80211_SME_IDLE;
821                 mutex_unlock(&rdev->devlist_mtx);
822 #ifdef CONFIG_CFG80211_WEXT
823                 wdev->wext.default_key = -1;
824                 wdev->wext.default_mgmt_key = -1;
825                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
826 #endif
827
828                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
829                         wdev->ps = true;
830                 else
831                         wdev->ps = false;
832                 /* allow mac80211 to determine the timeout */
833                 wdev->ps_timeout = -1;
834
835                 if (!dev->ethtool_ops)
836                         dev->ethtool_ops = &cfg80211_ethtool_ops;
837
838                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
839                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
840                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
841                         dev->priv_flags |= IFF_DONT_BRIDGE;
842                 break;
843         case NETDEV_GOING_DOWN:
844                 switch (wdev->iftype) {
845                 case NL80211_IFTYPE_ADHOC:
846                         cfg80211_leave_ibss(rdev, dev, true);
847                         break;
848                 case NL80211_IFTYPE_P2P_CLIENT:
849                 case NL80211_IFTYPE_STATION:
850                         mutex_lock(&rdev->sched_scan_mtx);
851                         __cfg80211_stop_sched_scan(rdev, false);
852                         mutex_unlock(&rdev->sched_scan_mtx);
853
854                         wdev_lock(wdev);
855 #ifdef CONFIG_CFG80211_WEXT
856                         kfree(wdev->wext.ie);
857                         wdev->wext.ie = NULL;
858                         wdev->wext.ie_len = 0;
859                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
860 #endif
861                         __cfg80211_disconnect(rdev, dev,
862                                               WLAN_REASON_DEAUTH_LEAVING, true);
863                         cfg80211_mlme_down(rdev, dev);
864                         wdev_unlock(wdev);
865                         break;
866                 case NL80211_IFTYPE_MESH_POINT:
867                         cfg80211_leave_mesh(rdev, dev);
868                         break;
869                 default:
870                         break;
871                 }
872                 wdev->beacon_interval = 0;
873                 break;
874         case NETDEV_DOWN:
875                 dev_hold(dev);
876                 queue_work(cfg80211_wq, &wdev->cleanup_work);
877                 break;
878         case NETDEV_UP:
879                 /*
880                  * If we have a really quick DOWN/UP succession we may
881                  * have this work still pending ... cancel it and see
882                  * if it was pending, in which case we need to account
883                  * for some of the work it would have done.
884                  */
885                 if (cancel_work_sync(&wdev->cleanup_work)) {
886                         mutex_lock(&rdev->devlist_mtx);
887                         rdev->opencount--;
888                         mutex_unlock(&rdev->devlist_mtx);
889                         dev_put(dev);
890                 }
891                 cfg80211_lock_rdev(rdev);
892                 mutex_lock(&rdev->devlist_mtx);
893                 wdev_lock(wdev);
894                 switch (wdev->iftype) {
895 #ifdef CONFIG_CFG80211_WEXT
896                 case NL80211_IFTYPE_ADHOC:
897                         cfg80211_ibss_wext_join(rdev, wdev);
898                         break;
899                 case NL80211_IFTYPE_STATION:
900                         cfg80211_mgd_wext_connect(rdev, wdev);
901                         break;
902 #endif
903 #ifdef CONFIG_MAC80211_MESH
904                 case NL80211_IFTYPE_MESH_POINT:
905                         {
906                                 /* backward compat code... */
907                                 struct mesh_setup setup;
908                                 memcpy(&setup, &default_mesh_setup,
909                                                 sizeof(setup));
910                                  /* back compat only needed for mesh_id */
911                                 setup.mesh_id = wdev->ssid;
912                                 setup.mesh_id_len = wdev->mesh_id_up_len;
913                                 if (wdev->mesh_id_up_len)
914                                         __cfg80211_join_mesh(rdev, dev,
915                                                         &setup,
916                                                         &default_mesh_config);
917                                 break;
918                         }
919 #endif
920                 default:
921                         break;
922                 }
923                 wdev_unlock(wdev);
924                 rdev->opencount++;
925                 mutex_unlock(&rdev->devlist_mtx);
926                 cfg80211_unlock_rdev(rdev);
927
928                 /*
929                  * Configure power management to the driver here so that its
930                  * correctly set also after interface type changes etc.
931                  */
932                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
933                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
934                     rdev->ops->set_power_mgmt)
935                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
936                                                       wdev->ps,
937                                                       wdev->ps_timeout)) {
938                                 /* assume this means it's off */
939                                 wdev->ps = false;
940                         }
941                 break;
942         case NETDEV_UNREGISTER:
943                 /*
944                  * NB: cannot take rdev->mtx here because this may be
945                  * called within code protected by it when interfaces
946                  * are removed with nl80211.
947                  */
948                 mutex_lock(&rdev->devlist_mtx);
949                 /*
950                  * It is possible to get NETDEV_UNREGISTER
951                  * multiple times. To detect that, check
952                  * that the interface is still on the list
953                  * of registered interfaces, and only then
954                  * remove and clean it up.
955                  */
956                 if (!list_empty(&wdev->list)) {
957                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
958                         list_del_rcu(&wdev->list);
959                         rdev->devlist_generation++;
960                         cfg80211_mlme_purge_registrations(wdev);
961 #ifdef CONFIG_CFG80211_WEXT
962                         kfree(wdev->wext.keys);
963 #endif
964                 }
965                 mutex_unlock(&rdev->devlist_mtx);
966                 /*
967                  * synchronise (so that we won't find this netdev
968                  * from other code any more) and then clear the list
969                  * head so that the above code can safely check for
970                  * !list_empty() to avoid double-cleanup.
971                  */
972                 synchronize_rcu();
973                 INIT_LIST_HEAD(&wdev->list);
974                 break;
975         case NETDEV_PRE_UP:
976                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
977                         return notifier_from_errno(-EOPNOTSUPP);
978                 if (rfkill_blocked(rdev->rfkill))
979                         return notifier_from_errno(-ERFKILL);
980                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
981                 if (ret)
982                         return notifier_from_errno(ret);
983                 break;
984         }
985
986         return NOTIFY_DONE;
987 }
988
989 static struct notifier_block cfg80211_netdev_notifier = {
990         .notifier_call = cfg80211_netdev_notifier_call,
991 };
992
993 static void __net_exit cfg80211_pernet_exit(struct net *net)
994 {
995         struct cfg80211_registered_device *rdev;
996
997         rtnl_lock();
998         mutex_lock(&cfg80211_mutex);
999         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1000                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1001                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1002         }
1003         mutex_unlock(&cfg80211_mutex);
1004         rtnl_unlock();
1005 }
1006
1007 static struct pernet_operations cfg80211_pernet_ops = {
1008         .exit = cfg80211_pernet_exit,
1009 };
1010
1011 static int __init cfg80211_init(void)
1012 {
1013         int err;
1014
1015         err = register_pernet_device(&cfg80211_pernet_ops);
1016         if (err)
1017                 goto out_fail_pernet;
1018
1019         err = wiphy_sysfs_init();
1020         if (err)
1021                 goto out_fail_sysfs;
1022
1023         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1024         if (err)
1025                 goto out_fail_notifier;
1026
1027         err = nl80211_init();
1028         if (err)
1029                 goto out_fail_nl80211;
1030
1031         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1032
1033         err = regulatory_init();
1034         if (err)
1035                 goto out_fail_reg;
1036
1037         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1038         if (!cfg80211_wq)
1039                 goto out_fail_wq;
1040
1041         return 0;
1042
1043 out_fail_wq:
1044         regulatory_exit();
1045 out_fail_reg:
1046         debugfs_remove(ieee80211_debugfs_dir);
1047 out_fail_nl80211:
1048         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1049 out_fail_notifier:
1050         wiphy_sysfs_exit();
1051 out_fail_sysfs:
1052         unregister_pernet_device(&cfg80211_pernet_ops);
1053 out_fail_pernet:
1054         return err;
1055 }
1056 subsys_initcall(cfg80211_init);
1057
1058 static void __exit cfg80211_exit(void)
1059 {
1060         debugfs_remove(ieee80211_debugfs_dir);
1061         nl80211_exit();
1062         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1063         wiphy_sysfs_exit();
1064         regulatory_exit();
1065         unregister_pernet_device(&cfg80211_pernet_ops);
1066         destroy_workqueue(cfg80211_wq);
1067 }
1068 module_exit(cfg80211_exit);