1 /*
2 * This is the linux wireless configuration interface.
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
6 * Copyright 2015 Intel Deutschland GmbH
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/if.h>
12 #include <linux/module.h>
13 #include <linux/err.h>
14 #include <linux/list.h>
15 #include <linux/slab.h>
16 #include <linux/nl80211.h>
17 #include <linux/debugfs.h>
18 #include <linux/notifier.h>
19 #include <linux/device.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/sched.h>
23 #include <net/genetlink.h>
24 #include <net/cfg80211.h>
25 #include "nl80211.h"
26 #include "core.h"
27 #include "sysfs.h"
28 #include "debugfs.h"
29 #include "wext-compat.h"
30 #include "rdev-ops.h"
31
32 /* name for sysfs, %d is appended */
33 #define PHY_NAME "phy"
34
35 MODULE_AUTHOR("Johannes Berg");
36 MODULE_LICENSE("GPL");
37 MODULE_DESCRIPTION("wireless configuration support");
38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
39
40 /* RCU-protected (and RTNL for writers) */
41 LIST_HEAD(cfg80211_rdev_list);
42 int cfg80211_rdev_list_generation;
43
44 /* for debugfs */
45 static struct dentry *ieee80211_debugfs_dir;
46
47 /* for the cleanup, scan and event works */
48 struct workqueue_struct *cfg80211_wq;
49
50 static bool cfg80211_disable_40mhz_24ghz;
51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
53 "Disable 40MHz support in the 2.4GHz band");
54
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
56 {
57 struct cfg80211_registered_device *result = NULL, *rdev;
58
59 ASSERT_RTNL();
60
61 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
62 if (rdev->wiphy_idx == wiphy_idx) {
63 result = rdev;
64 break;
65 }
66 }
67
68 return result;
69 }
70
get_wiphy_idx(struct wiphy * wiphy)71 int get_wiphy_idx(struct wiphy *wiphy)
72 {
73 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
74
75 return rdev->wiphy_idx;
76 }
77
wiphy_idx_to_wiphy(int wiphy_idx)78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
79 {
80 struct cfg80211_registered_device *rdev;
81
82 ASSERT_RTNL();
83
84 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
85 if (!rdev)
86 return NULL;
87 return &rdev->wiphy;
88 }
89
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
91 const char *newname)
92 {
93 struct cfg80211_registered_device *rdev2;
94 int wiphy_idx, taken = -1, digits;
95
96 ASSERT_RTNL();
97
98 /* prohibit calling the thing phy%d when %d is not its number */
99 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
100 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
101 /* count number of places needed to print wiphy_idx */
102 digits = 1;
103 while (wiphy_idx /= 10)
104 digits++;
105 /*
106 * deny the name if it is phy<idx> where <idx> is printed
107 * without leading zeroes. taken == strlen(newname) here
108 */
109 if (taken == strlen(PHY_NAME) + digits)
110 return -EINVAL;
111 }
112
113 /* Ensure another device does not already have this name. */
114 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
115 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
116 return -EINVAL;
117
118 return 0;
119 }
120
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
122 char *newname)
123 {
124 int result;
125
126 ASSERT_RTNL();
127
128 /* Ignore nop renames */
129 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
130 return 0;
131
132 result = cfg80211_dev_check_name(rdev, newname);
133 if (result < 0)
134 return result;
135
136 result = device_rename(&rdev->wiphy.dev, newname);
137 if (result)
138 return result;
139
140 if (rdev->wiphy.debugfsdir &&
141 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
142 rdev->wiphy.debugfsdir,
143 rdev->wiphy.debugfsdir->d_parent,
144 newname))
145 pr_err("failed to rename debugfs dir to %s!\n", newname);
146
147 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
148
149 return 0;
150 }
151
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
153 struct net *net)
154 {
155 struct wireless_dev *wdev;
156 int err = 0;
157
158 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
159 return -EOPNOTSUPP;
160
161 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
162 if (!wdev->netdev)
163 continue;
164 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
165 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
166 if (err)
167 break;
168 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
169 }
170
171 if (err) {
172 /* failed -- clean up to old netns */
173 net = wiphy_net(&rdev->wiphy);
174
175 list_for_each_entry_continue_reverse(wdev,
176 &rdev->wiphy.wdev_list,
177 list) {
178 if (!wdev->netdev)
179 continue;
180 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
181 err = dev_change_net_namespace(wdev->netdev, net,
182 "wlan%d");
183 WARN_ON(err);
184 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
185 }
186
187 return err;
188 }
189
190 wiphy_net_set(&rdev->wiphy, net);
191
192 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
193 WARN_ON(err);
194
195 return 0;
196 }
197
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
199 {
200 struct cfg80211_registered_device *rdev = data;
201
202 rdev_rfkill_poll(rdev);
203 }
204
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
206 struct wireless_dev *wdev)
207 {
208 ASSERT_RTNL();
209
210 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
211 return;
212
213 if (!wdev->p2p_started)
214 return;
215
216 rdev_stop_p2p_device(rdev, wdev);
217 wdev->p2p_started = false;
218
219 rdev->opencount--;
220
221 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
222 if (WARN_ON(!rdev->scan_req->notified))
223 rdev->scan_req->info.aborted = true;
224 ___cfg80211_scan_done(rdev, false);
225 }
226 }
227
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)228 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
229 struct wireless_dev *wdev)
230 {
231 ASSERT_RTNL();
232
233 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
234 return;
235
236 if (!wdev->nan_started)
237 return;
238
239 rdev_stop_nan(rdev, wdev);
240 wdev->nan_started = false;
241
242 rdev->opencount--;
243 }
244
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)245 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
246 {
247 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
248 struct wireless_dev *wdev;
249
250 ASSERT_RTNL();
251
252 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
253 if (wdev->netdev) {
254 dev_close(wdev->netdev);
255 continue;
256 }
257 /* otherwise, check iftype */
258 switch (wdev->iftype) {
259 case NL80211_IFTYPE_P2P_DEVICE:
260 cfg80211_stop_p2p_device(rdev, wdev);
261 break;
262 case NL80211_IFTYPE_NAN:
263 cfg80211_stop_nan(rdev, wdev);
264 break;
265 default:
266 break;
267 }
268 }
269 }
270 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
271
cfg80211_rfkill_set_block(void * data,bool blocked)272 static int cfg80211_rfkill_set_block(void *data, bool blocked)
273 {
274 struct cfg80211_registered_device *rdev = data;
275
276 if (!blocked)
277 return 0;
278
279 rtnl_lock();
280 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
281 rtnl_unlock();
282
283 return 0;
284 }
285
cfg80211_rfkill_sync_work(struct work_struct * work)286 static void cfg80211_rfkill_sync_work(struct work_struct *work)
287 {
288 struct cfg80211_registered_device *rdev;
289
290 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
291 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
292 }
293
cfg80211_event_work(struct work_struct * work)294 static void cfg80211_event_work(struct work_struct *work)
295 {
296 struct cfg80211_registered_device *rdev;
297
298 rdev = container_of(work, struct cfg80211_registered_device,
299 event_work);
300
301 rtnl_lock();
302 cfg80211_process_rdev_events(rdev);
303 rtnl_unlock();
304 }
305
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)306 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
307 {
308 struct cfg80211_iface_destroy *item;
309
310 ASSERT_RTNL();
311
312 spin_lock_irq(&rdev->destroy_list_lock);
313 while ((item = list_first_entry_or_null(&rdev->destroy_list,
314 struct cfg80211_iface_destroy,
315 list))) {
316 struct wireless_dev *wdev, *tmp;
317 u32 nlportid = item->nlportid;
318
319 list_del(&item->list);
320 kfree(item);
321 spin_unlock_irq(&rdev->destroy_list_lock);
322
323 list_for_each_entry_safe(wdev, tmp,
324 &rdev->wiphy.wdev_list, list) {
325 if (nlportid == wdev->owner_nlportid)
326 rdev_del_virtual_intf(rdev, wdev);
327 }
328
329 spin_lock_irq(&rdev->destroy_list_lock);
330 }
331 spin_unlock_irq(&rdev->destroy_list_lock);
332 }
333
cfg80211_destroy_iface_wk(struct work_struct * work)334 static void cfg80211_destroy_iface_wk(struct work_struct *work)
335 {
336 struct cfg80211_registered_device *rdev;
337
338 rdev = container_of(work, struct cfg80211_registered_device,
339 destroy_work);
340
341 rtnl_lock();
342 cfg80211_destroy_ifaces(rdev);
343 rtnl_unlock();
344 }
345
cfg80211_sched_scan_stop_wk(struct work_struct * work)346 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
347 {
348 struct cfg80211_registered_device *rdev;
349
350 rdev = container_of(work, struct cfg80211_registered_device,
351 sched_scan_stop_wk);
352
353 rtnl_lock();
354
355 __cfg80211_stop_sched_scan(rdev, false);
356
357 rtnl_unlock();
358 }
359
360 /* exported functions */
361
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)362 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
363 const char *requested_name)
364 {
365 static atomic_t wiphy_counter = ATOMIC_INIT(0);
366
367 struct cfg80211_registered_device *rdev;
368 int alloc_size;
369
370 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
371 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
372 WARN_ON(ops->connect && !ops->disconnect);
373 WARN_ON(ops->join_ibss && !ops->leave_ibss);
374 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
375 WARN_ON(ops->add_station && !ops->del_station);
376 WARN_ON(ops->add_mpath && !ops->del_mpath);
377 WARN_ON(ops->join_mesh && !ops->leave_mesh);
378 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
379 WARN_ON(ops->start_ap && !ops->stop_ap);
380 WARN_ON(ops->join_ocb && !ops->leave_ocb);
381 WARN_ON(ops->suspend && !ops->resume);
382 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
383 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
384 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
385 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
386
387 alloc_size = sizeof(*rdev) + sizeof_priv;
388
389 rdev = kzalloc(alloc_size, GFP_KERNEL);
390 if (!rdev)
391 return NULL;
392
393 rdev->ops = ops;
394
395 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
396
397 if (unlikely(rdev->wiphy_idx < 0)) {
398 /* ugh, wrapped! */
399 atomic_dec(&wiphy_counter);
400 kfree(rdev);
401 return NULL;
402 }
403
404 /* atomic_inc_return makes it start at 1, make it start at 0 */
405 rdev->wiphy_idx--;
406
407 /* give it a proper name */
408 if (requested_name && requested_name[0]) {
409 int rv;
410
411 rtnl_lock();
412 rv = cfg80211_dev_check_name(rdev, requested_name);
413
414 if (rv < 0) {
415 rtnl_unlock();
416 goto use_default_name;
417 }
418
419 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
420 rtnl_unlock();
421 if (rv)
422 goto use_default_name;
423 } else {
424 int rv;
425
426 use_default_name:
427 /* NOTE: This is *probably* safe w/out holding rtnl because of
428 * the restrictions on phy names. Probably this call could
429 * fail if some other part of the kernel (re)named a device
430 * phyX. But, might should add some locking and check return
431 * value, and use a different name if this one exists?
432 */
433 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
434 if (rv < 0) {
435 kfree(rdev);
436 return NULL;
437 }
438 }
439
440 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
441 INIT_LIST_HEAD(&rdev->beacon_registrations);
442 spin_lock_init(&rdev->beacon_registrations_lock);
443 spin_lock_init(&rdev->bss_lock);
444 INIT_LIST_HEAD(&rdev->bss_list);
445 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
446 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
447 INIT_LIST_HEAD(&rdev->mlme_unreg);
448 spin_lock_init(&rdev->mlme_unreg_lock);
449 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
450 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
451 cfg80211_dfs_channels_update_work);
452 #ifdef CONFIG_CFG80211_WEXT
453 rdev->wiphy.wext = &cfg80211_wext_handler;
454 #endif
455
456 device_initialize(&rdev->wiphy.dev);
457 rdev->wiphy.dev.class = &ieee80211_class;
458 rdev->wiphy.dev.platform_data = rdev;
459 device_enable_async_suspend(&rdev->wiphy.dev);
460
461 INIT_LIST_HEAD(&rdev->destroy_list);
462 spin_lock_init(&rdev->destroy_list_lock);
463 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
464 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
465
466 #ifdef CONFIG_CFG80211_DEFAULT_PS
467 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
468 #endif
469
470 wiphy_net_set(&rdev->wiphy, &init_net);
471
472 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
473 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
474 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
475 &rdev->rfkill_ops, rdev);
476
477 if (!rdev->rfkill) {
478 kfree(rdev);
479 return NULL;
480 }
481
482 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
483 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
484 INIT_WORK(&rdev->event_work, cfg80211_event_work);
485
486 init_waitqueue_head(&rdev->dev_wait);
487
488 /*
489 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
490 * Fragmentation and RTS threshold are disabled by default with the
491 * special -1 value.
492 */
493 rdev->wiphy.retry_short = 7;
494 rdev->wiphy.retry_long = 4;
495 rdev->wiphy.frag_threshold = (u32) -1;
496 rdev->wiphy.rts_threshold = (u32) -1;
497 rdev->wiphy.coverage_class = 0;
498
499 rdev->wiphy.max_num_csa_counters = 1;
500
501 rdev->wiphy.max_sched_scan_plans = 1;
502 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
503
504 return &rdev->wiphy;
505 }
506 EXPORT_SYMBOL(wiphy_new_nm);
507
wiphy_verify_combinations(struct wiphy * wiphy)508 static int wiphy_verify_combinations(struct wiphy *wiphy)
509 {
510 const struct ieee80211_iface_combination *c;
511 int i, j;
512
513 for (i = 0; i < wiphy->n_iface_combinations; i++) {
514 u32 cnt = 0;
515 u16 all_iftypes = 0;
516
517 c = &wiphy->iface_combinations[i];
518
519 /*
520 * Combinations with just one interface aren't real,
521 * however we make an exception for DFS.
522 */
523 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
524 return -EINVAL;
525
526 /* Need at least one channel */
527 if (WARN_ON(!c->num_different_channels))
528 return -EINVAL;
529
530 /*
531 * Put a sane limit on maximum number of different
532 * channels to simplify channel accounting code.
533 */
534 if (WARN_ON(c->num_different_channels >
535 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
536 return -EINVAL;
537
538 /* DFS only works on one channel. */
539 if (WARN_ON(c->radar_detect_widths &&
540 (c->num_different_channels > 1)))
541 return -EINVAL;
542
543 if (WARN_ON(!c->n_limits))
544 return -EINVAL;
545
546 for (j = 0; j < c->n_limits; j++) {
547 u16 types = c->limits[j].types;
548
549 /* interface types shouldn't overlap */
550 if (WARN_ON(types & all_iftypes))
551 return -EINVAL;
552 all_iftypes |= types;
553
554 if (WARN_ON(!c->limits[j].max))
555 return -EINVAL;
556
557 /* Shouldn't list software iftypes in combinations! */
558 if (WARN_ON(wiphy->software_iftypes & types))
559 return -EINVAL;
560
561 /* Only a single P2P_DEVICE can be allowed */
562 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
563 c->limits[j].max > 1))
564 return -EINVAL;
565
566 /* Only a single NAN can be allowed */
567 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
568 c->limits[j].max > 1))
569 return -EINVAL;
570
571 cnt += c->limits[j].max;
572 /*
573 * Don't advertise an unsupported type
574 * in a combination.
575 */
576 if (WARN_ON((wiphy->interface_modes & types) != types))
577 return -EINVAL;
578 }
579
580 /* You can't even choose that many! */
581 if (WARN_ON(cnt < c->max_interfaces))
582 return -EINVAL;
583 }
584
585 return 0;
586 }
587
wiphy_register(struct wiphy * wiphy)588 int wiphy_register(struct wiphy *wiphy)
589 {
590 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
591 int res;
592 enum nl80211_band band;
593 struct ieee80211_supported_band *sband;
594 bool have_band = false;
595 int i;
596 u16 ifmodes = wiphy->interface_modes;
597
598 #ifdef CONFIG_PM
599 if (WARN_ON(wiphy->wowlan &&
600 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
601 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
602 return -EINVAL;
603 if (WARN_ON(wiphy->wowlan &&
604 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
605 !wiphy->wowlan->tcp))
606 return -EINVAL;
607 #endif
608 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
609 (!rdev->ops->tdls_channel_switch ||
610 !rdev->ops->tdls_cancel_channel_switch)))
611 return -EINVAL;
612
613 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
614 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
615 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func)))
616 return -EINVAL;
617
618 /*
619 * if a wiphy has unsupported modes for regulatory channel enforcement,
620 * opt-out of enforcement checking
621 */
622 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
623 BIT(NL80211_IFTYPE_P2P_CLIENT) |
624 BIT(NL80211_IFTYPE_AP) |
625 BIT(NL80211_IFTYPE_P2P_GO) |
626 BIT(NL80211_IFTYPE_ADHOC) |
627 BIT(NL80211_IFTYPE_P2P_DEVICE) |
628 BIT(NL80211_IFTYPE_NAN) |
629 BIT(NL80211_IFTYPE_AP_VLAN) |
630 BIT(NL80211_IFTYPE_MONITOR)))
631 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
632
633 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
634 (wiphy->regulatory_flags &
635 (REGULATORY_CUSTOM_REG |
636 REGULATORY_STRICT_REG |
637 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
638 REGULATORY_COUNTRY_IE_IGNORE))))
639 return -EINVAL;
640
641 if (WARN_ON(wiphy->coalesce &&
642 (!wiphy->coalesce->n_rules ||
643 !wiphy->coalesce->n_patterns) &&
644 (!wiphy->coalesce->pattern_min_len ||
645 wiphy->coalesce->pattern_min_len >
646 wiphy->coalesce->pattern_max_len)))
647 return -EINVAL;
648
649 if (WARN_ON(wiphy->ap_sme_capa &&
650 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
651 return -EINVAL;
652
653 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
654 return -EINVAL;
655
656 if (WARN_ON(wiphy->addresses &&
657 !is_zero_ether_addr(wiphy->perm_addr) &&
658 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
659 ETH_ALEN)))
660 return -EINVAL;
661
662 if (WARN_ON(wiphy->max_acl_mac_addrs &&
663 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
664 !rdev->ops->set_mac_acl)))
665 return -EINVAL;
666
667 /* assure only valid behaviours are flagged by driver
668 * hence subtract 2 as bit 0 is invalid.
669 */
670 if (WARN_ON(wiphy->bss_select_support &&
671 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
672 return -EINVAL;
673
674 if (wiphy->addresses)
675 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
676
677 /* sanity check ifmodes */
678 WARN_ON(!ifmodes);
679 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
680 if (WARN_ON(ifmodes != wiphy->interface_modes))
681 wiphy->interface_modes = ifmodes;
682
683 res = wiphy_verify_combinations(wiphy);
684 if (res)
685 return res;
686
687 /* sanity check supported bands/channels */
688 for (band = 0; band < NUM_NL80211_BANDS; band++) {
689 sband = wiphy->bands[band];
690 if (!sband)
691 continue;
692
693 sband->band = band;
694 if (WARN_ON(!sband->n_channels))
695 return -EINVAL;
696 /*
697 * on 60GHz band, there are no legacy rates, so
698 * n_bitrates is 0
699 */
700 if (WARN_ON(band != NL80211_BAND_60GHZ &&
701 !sband->n_bitrates))
702 return -EINVAL;
703
704 /*
705 * Since cfg80211_disable_40mhz_24ghz is global, we can
706 * modify the sband's ht data even if the driver uses a
707 * global structure for that.
708 */
709 if (cfg80211_disable_40mhz_24ghz &&
710 band == NL80211_BAND_2GHZ &&
711 sband->ht_cap.ht_supported) {
712 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
713 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
714 }
715
716 /*
717 * Since we use a u32 for rate bitmaps in
718 * ieee80211_get_response_rate, we cannot
719 * have more than 32 legacy rates.
720 */
721 if (WARN_ON(sband->n_bitrates > 32))
722 return -EINVAL;
723
724 for (i = 0; i < sband->n_channels; i++) {
725 sband->channels[i].orig_flags =
726 sband->channels[i].flags;
727 sband->channels[i].orig_mag = INT_MAX;
728 sband->channels[i].orig_mpwr =
729 sband->channels[i].max_power;
730 sband->channels[i].band = band;
731 }
732
733 have_band = true;
734 }
735
736 if (!have_band) {
737 WARN_ON(1);
738 return -EINVAL;
739 }
740
741 #ifdef CONFIG_PM
742 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
743 (!rdev->wiphy.wowlan->pattern_min_len ||
744 rdev->wiphy.wowlan->pattern_min_len >
745 rdev->wiphy.wowlan->pattern_max_len)))
746 return -EINVAL;
747 #endif
748
749 /* check and set up bitrates */
750 ieee80211_set_bitrate_flags(wiphy);
751
752 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
753
754 rtnl_lock();
755 res = device_add(&rdev->wiphy.dev);
756 if (res) {
757 rtnl_unlock();
758 return res;
759 }
760
761 /* set up regulatory info */
762 wiphy_regulatory_register(wiphy);
763
764 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
765 cfg80211_rdev_list_generation++;
766
767 /* add to debugfs */
768 rdev->wiphy.debugfsdir =
769 debugfs_create_dir(wiphy_name(&rdev->wiphy),
770 ieee80211_debugfs_dir);
771 if (IS_ERR(rdev->wiphy.debugfsdir))
772 rdev->wiphy.debugfsdir = NULL;
773
774 cfg80211_debugfs_rdev_add(rdev);
775 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
776
777 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
778 struct regulatory_request request;
779
780 request.wiphy_idx = get_wiphy_idx(wiphy);
781 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
782 request.alpha2[0] = '9';
783 request.alpha2[1] = '9';
784
785 nl80211_send_reg_change_event(&request);
786 }
787
788 /* Check that nobody globally advertises any capabilities they do not
789 * advertise on all possible interface types.
790 */
791 if (wiphy->extended_capabilities_len &&
792 wiphy->num_iftype_ext_capab &&
793 wiphy->iftype_ext_capab) {
794 u8 supported_on_all, j;
795 const struct wiphy_iftype_ext_capab *capab;
796
797 capab = wiphy->iftype_ext_capab;
798 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
799 if (capab[0].extended_capabilities_len > j)
800 supported_on_all =
801 capab[0].extended_capabilities[j];
802 else
803 supported_on_all = 0x00;
804 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
805 if (j >= capab[i].extended_capabilities_len) {
806 supported_on_all = 0x00;
807 break;
808 }
809 supported_on_all &=
810 capab[i].extended_capabilities[j];
811 }
812 if (WARN_ON(wiphy->extended_capabilities[j] &
813 ~supported_on_all))
814 break;
815 }
816 }
817
818 rdev->wiphy.registered = true;
819 rtnl_unlock();
820
821 res = rfkill_register(rdev->rfkill);
822 if (res) {
823 rfkill_destroy(rdev->rfkill);
824 rdev->rfkill = NULL;
825 wiphy_unregister(&rdev->wiphy);
826 return res;
827 }
828
829 return 0;
830 }
831 EXPORT_SYMBOL(wiphy_register);
832
wiphy_rfkill_start_polling(struct wiphy * wiphy)833 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
834 {
835 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
836
837 if (!rdev->ops->rfkill_poll)
838 return;
839 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
840 rfkill_resume_polling(rdev->rfkill);
841 }
842 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
843
wiphy_rfkill_stop_polling(struct wiphy * wiphy)844 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
845 {
846 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
847
848 rfkill_pause_polling(rdev->rfkill);
849 }
850 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
851
wiphy_unregister(struct wiphy * wiphy)852 void wiphy_unregister(struct wiphy *wiphy)
853 {
854 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
855
856 wait_event(rdev->dev_wait, ({
857 int __count;
858 rtnl_lock();
859 __count = rdev->opencount;
860 rtnl_unlock();
861 __count == 0; }));
862
863 if (rdev->rfkill)
864 rfkill_unregister(rdev->rfkill);
865
866 rtnl_lock();
867 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
868 rdev->wiphy.registered = false;
869
870 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
871
872 /*
873 * First remove the hardware from everywhere, this makes
874 * it impossible to find from userspace.
875 */
876 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
877 list_del_rcu(&rdev->list);
878 synchronize_rcu();
879
880 /*
881 * If this device got a regulatory hint tell core its
882 * free to listen now to a new shiny device regulatory hint
883 */
884 wiphy_regulatory_deregister(wiphy);
885
886 cfg80211_rdev_list_generation++;
887 device_del(&rdev->wiphy.dev);
888
889 rtnl_unlock();
890
891 flush_work(&rdev->scan_done_wk);
892 cancel_work_sync(&rdev->conn_work);
893 flush_work(&rdev->event_work);
894 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
895 flush_work(&rdev->destroy_work);
896 flush_work(&rdev->sched_scan_stop_wk);
897 flush_work(&rdev->mlme_unreg_wk);
898
899 #ifdef CONFIG_PM
900 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
901 rdev_set_wakeup(rdev, false);
902 #endif
903 cfg80211_rdev_free_wowlan(rdev);
904 cfg80211_rdev_free_coalesce(rdev);
905 }
906 EXPORT_SYMBOL(wiphy_unregister);
907
cfg80211_dev_free(struct cfg80211_registered_device * rdev)908 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
909 {
910 struct cfg80211_internal_bss *scan, *tmp;
911 struct cfg80211_beacon_registration *reg, *treg;
912 rfkill_destroy(rdev->rfkill);
913 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
914 list_del(®->list);
915 kfree(reg);
916 }
917 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
918 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
919 kfree(rdev);
920 }
921
wiphy_free(struct wiphy * wiphy)922 void wiphy_free(struct wiphy *wiphy)
923 {
924 put_device(&wiphy->dev);
925 }
926 EXPORT_SYMBOL(wiphy_free);
927
wiphy_rfkill_set_hw_state(struct wiphy * wiphy,bool blocked)928 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
929 {
930 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
931
932 if (rfkill_set_hw_state(rdev->rfkill, blocked))
933 schedule_work(&rdev->rfkill_sync);
934 }
935 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
936
cfg80211_unregister_wdev(struct wireless_dev * wdev)937 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
938 {
939 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
940
941 ASSERT_RTNL();
942
943 if (WARN_ON(wdev->netdev))
944 return;
945
946 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
947
948 list_del_rcu(&wdev->list);
949 rdev->devlist_generation++;
950
951 switch (wdev->iftype) {
952 case NL80211_IFTYPE_P2P_DEVICE:
953 cfg80211_mlme_purge_registrations(wdev);
954 cfg80211_stop_p2p_device(rdev, wdev);
955 break;
956 case NL80211_IFTYPE_NAN:
957 cfg80211_stop_nan(rdev, wdev);
958 break;
959 default:
960 WARN_ON_ONCE(1);
961 break;
962 }
963 }
964 EXPORT_SYMBOL(cfg80211_unregister_wdev);
965
966 static const struct device_type wiphy_type = {
967 .name = "wlan",
968 };
969
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)970 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
971 enum nl80211_iftype iftype, int num)
972 {
973 ASSERT_RTNL();
974
975 rdev->num_running_ifaces += num;
976 if (iftype == NL80211_IFTYPE_MONITOR)
977 rdev->num_running_monitor_ifaces += num;
978 }
979
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)980 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
981 struct wireless_dev *wdev)
982 {
983 struct net_device *dev = wdev->netdev;
984 struct cfg80211_sched_scan_request *sched_scan_req;
985
986 ASSERT_RTNL();
987 ASSERT_WDEV_LOCK(wdev);
988
989 switch (wdev->iftype) {
990 case NL80211_IFTYPE_ADHOC:
991 __cfg80211_leave_ibss(rdev, dev, true);
992 break;
993 case NL80211_IFTYPE_P2P_CLIENT:
994 case NL80211_IFTYPE_STATION:
995 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
996 if (sched_scan_req && dev == sched_scan_req->dev)
997 __cfg80211_stop_sched_scan(rdev, false);
998
999 #ifdef CONFIG_CFG80211_WEXT
1000 kfree(wdev->wext.ie);
1001 wdev->wext.ie = NULL;
1002 wdev->wext.ie_len = 0;
1003 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1004 #endif
1005 cfg80211_disconnect(rdev, dev,
1006 WLAN_REASON_DEAUTH_LEAVING, true);
1007 break;
1008 case NL80211_IFTYPE_MESH_POINT:
1009 __cfg80211_leave_mesh(rdev, dev);
1010 break;
1011 case NL80211_IFTYPE_AP:
1012 case NL80211_IFTYPE_P2P_GO:
1013 __cfg80211_stop_ap(rdev, dev, true);
1014 break;
1015 case NL80211_IFTYPE_OCB:
1016 __cfg80211_leave_ocb(rdev, dev);
1017 break;
1018 case NL80211_IFTYPE_WDS:
1019 /* must be handled by mac80211/driver, has no APIs */
1020 break;
1021 case NL80211_IFTYPE_P2P_DEVICE:
1022 case NL80211_IFTYPE_NAN:
1023 /* cannot happen, has no netdev */
1024 break;
1025 case NL80211_IFTYPE_AP_VLAN:
1026 case NL80211_IFTYPE_MONITOR:
1027 /* nothing to do */
1028 break;
1029 case NL80211_IFTYPE_UNSPECIFIED:
1030 case NUM_NL80211_IFTYPES:
1031 /* invalid */
1032 break;
1033 }
1034 }
1035
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1036 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1037 struct wireless_dev *wdev)
1038 {
1039 wdev_lock(wdev);
1040 __cfg80211_leave(rdev, wdev);
1041 wdev_unlock(wdev);
1042 }
1043
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1044 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1045 gfp_t gfp)
1046 {
1047 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1048 struct cfg80211_event *ev;
1049 unsigned long flags;
1050
1051 trace_cfg80211_stop_iface(wiphy, wdev);
1052
1053 ev = kzalloc(sizeof(*ev), gfp);
1054 if (!ev)
1055 return;
1056
1057 ev->type = EVENT_STOPPED;
1058
1059 spin_lock_irqsave(&wdev->event_lock, flags);
1060 list_add_tail(&ev->list, &wdev->event_list);
1061 spin_unlock_irqrestore(&wdev->event_lock, flags);
1062 queue_work(cfg80211_wq, &rdev->event_work);
1063 }
1064 EXPORT_SYMBOL(cfg80211_stop_iface);
1065
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1066 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1067 unsigned long state, void *ptr)
1068 {
1069 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1070 struct wireless_dev *wdev = dev->ieee80211_ptr;
1071 struct cfg80211_registered_device *rdev;
1072 struct cfg80211_sched_scan_request *sched_scan_req;
1073
1074 if (!wdev)
1075 return NOTIFY_DONE;
1076
1077 rdev = wiphy_to_rdev(wdev->wiphy);
1078
1079 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1080
1081 switch (state) {
1082 case NETDEV_POST_INIT:
1083 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1084 break;
1085 case NETDEV_REGISTER:
1086 /*
1087 * NB: cannot take rdev->mtx here because this may be
1088 * called within code protected by it when interfaces
1089 * are added with nl80211.
1090 */
1091 mutex_init(&wdev->mtx);
1092 INIT_LIST_HEAD(&wdev->event_list);
1093 spin_lock_init(&wdev->event_lock);
1094 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1095 spin_lock_init(&wdev->mgmt_registrations_lock);
1096
1097 wdev->identifier = ++rdev->wdev_id;
1098 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1099 rdev->devlist_generation++;
1100 /* can only change netns with wiphy */
1101 dev->features |= NETIF_F_NETNS_LOCAL;
1102
1103 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1104 "phy80211")) {
1105 pr_err("failed to add phy80211 symlink to netdev!\n");
1106 }
1107 wdev->netdev = dev;
1108 #ifdef CONFIG_CFG80211_WEXT
1109 wdev->wext.default_key = -1;
1110 wdev->wext.default_mgmt_key = -1;
1111 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1112 #endif
1113
1114 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1115 wdev->ps = true;
1116 else
1117 wdev->ps = false;
1118 /* allow mac80211 to determine the timeout */
1119 wdev->ps_timeout = -1;
1120
1121 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1122 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1123 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1124 dev->priv_flags |= IFF_DONT_BRIDGE;
1125
1126 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1127 break;
1128 case NETDEV_GOING_DOWN:
1129 cfg80211_leave(rdev, wdev);
1130 break;
1131 case NETDEV_DOWN:
1132 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1133 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1134 if (WARN_ON(!rdev->scan_req->notified))
1135 rdev->scan_req->info.aborted = true;
1136 ___cfg80211_scan_done(rdev, false);
1137 }
1138
1139 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1140 if (WARN_ON(sched_scan_req &&
1141 sched_scan_req->dev == wdev->netdev)) {
1142 __cfg80211_stop_sched_scan(rdev, false);
1143 }
1144
1145 rdev->opencount--;
1146 wake_up(&rdev->dev_wait);
1147 break;
1148 case NETDEV_UP:
1149 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1150 wdev_lock(wdev);
1151 switch (wdev->iftype) {
1152 #ifdef CONFIG_CFG80211_WEXT
1153 case NL80211_IFTYPE_ADHOC:
1154 cfg80211_ibss_wext_join(rdev, wdev);
1155 break;
1156 case NL80211_IFTYPE_STATION:
1157 cfg80211_mgd_wext_connect(rdev, wdev);
1158 break;
1159 #endif
1160 #ifdef CONFIG_MAC80211_MESH
1161 case NL80211_IFTYPE_MESH_POINT:
1162 {
1163 /* backward compat code... */
1164 struct mesh_setup setup;
1165 memcpy(&setup, &default_mesh_setup,
1166 sizeof(setup));
1167 /* back compat only needed for mesh_id */
1168 setup.mesh_id = wdev->ssid;
1169 setup.mesh_id_len = wdev->mesh_id_up_len;
1170 if (wdev->mesh_id_up_len)
1171 __cfg80211_join_mesh(rdev, dev,
1172 &setup,
1173 &default_mesh_config);
1174 break;
1175 }
1176 #endif
1177 default:
1178 break;
1179 }
1180 wdev_unlock(wdev);
1181 rdev->opencount++;
1182
1183 /*
1184 * Configure power management to the driver here so that its
1185 * correctly set also after interface type changes etc.
1186 */
1187 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1188 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1189 rdev->ops->set_power_mgmt)
1190 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1191 wdev->ps_timeout)) {
1192 /* assume this means it's off */
1193 wdev->ps = false;
1194 }
1195 break;
1196 case NETDEV_UNREGISTER:
1197 /*
1198 * It is possible to get NETDEV_UNREGISTER
1199 * multiple times. To detect that, check
1200 * that the interface is still on the list
1201 * of registered interfaces, and only then
1202 * remove and clean it up.
1203 */
1204 if (!list_empty(&wdev->list)) {
1205 nl80211_notify_iface(rdev, wdev,
1206 NL80211_CMD_DEL_INTERFACE);
1207 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1208 list_del_rcu(&wdev->list);
1209 rdev->devlist_generation++;
1210 cfg80211_mlme_purge_registrations(wdev);
1211 #ifdef CONFIG_CFG80211_WEXT
1212 kzfree(wdev->wext.keys);
1213 #endif
1214 }
1215 /*
1216 * synchronise (so that we won't find this netdev
1217 * from other code any more) and then clear the list
1218 * head so that the above code can safely check for
1219 * !list_empty() to avoid double-cleanup.
1220 */
1221 synchronize_rcu();
1222 INIT_LIST_HEAD(&wdev->list);
1223 /*
1224 * Ensure that all events have been processed and
1225 * freed.
1226 */
1227 cfg80211_process_wdev_events(wdev);
1228
1229 if (WARN_ON(wdev->current_bss)) {
1230 cfg80211_unhold_bss(wdev->current_bss);
1231 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1232 wdev->current_bss = NULL;
1233 }
1234 break;
1235 case NETDEV_PRE_UP:
1236 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1237 return notifier_from_errno(-EOPNOTSUPP);
1238 if (rfkill_blocked(rdev->rfkill))
1239 return notifier_from_errno(-ERFKILL);
1240 break;
1241 default:
1242 return NOTIFY_DONE;
1243 }
1244
1245 wireless_nlevent_flush();
1246
1247 return NOTIFY_OK;
1248 }
1249
1250 static struct notifier_block cfg80211_netdev_notifier = {
1251 .notifier_call = cfg80211_netdev_notifier_call,
1252 };
1253
cfg80211_pernet_exit(struct net * net)1254 static void __net_exit cfg80211_pernet_exit(struct net *net)
1255 {
1256 struct cfg80211_registered_device *rdev;
1257
1258 rtnl_lock();
1259 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1260 if (net_eq(wiphy_net(&rdev->wiphy), net))
1261 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1262 }
1263 rtnl_unlock();
1264 }
1265
1266 static struct pernet_operations cfg80211_pernet_ops = {
1267 .exit = cfg80211_pernet_exit,
1268 };
1269
cfg80211_init(void)1270 static int __init cfg80211_init(void)
1271 {
1272 int err;
1273
1274 err = register_pernet_device(&cfg80211_pernet_ops);
1275 if (err)
1276 goto out_fail_pernet;
1277
1278 err = wiphy_sysfs_init();
1279 if (err)
1280 goto out_fail_sysfs;
1281
1282 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1283 if (err)
1284 goto out_fail_notifier;
1285
1286 err = nl80211_init();
1287 if (err)
1288 goto out_fail_nl80211;
1289
1290 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1291
1292 err = regulatory_init();
1293 if (err)
1294 goto out_fail_reg;
1295
1296 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1297 if (!cfg80211_wq) {
1298 err = -ENOMEM;
1299 goto out_fail_wq;
1300 }
1301
1302 return 0;
1303
1304 out_fail_wq:
1305 regulatory_exit();
1306 out_fail_reg:
1307 debugfs_remove(ieee80211_debugfs_dir);
1308 nl80211_exit();
1309 out_fail_nl80211:
1310 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1311 out_fail_notifier:
1312 wiphy_sysfs_exit();
1313 out_fail_sysfs:
1314 unregister_pernet_device(&cfg80211_pernet_ops);
1315 out_fail_pernet:
1316 return err;
1317 }
1318 subsys_initcall(cfg80211_init);
1319
cfg80211_exit(void)1320 static void __exit cfg80211_exit(void)
1321 {
1322 debugfs_remove(ieee80211_debugfs_dir);
1323 nl80211_exit();
1324 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1325 wiphy_sysfs_exit();
1326 regulatory_exit();
1327 unregister_pernet_device(&cfg80211_pernet_ops);
1328 destroy_workqueue(cfg80211_wq);
1329 }
1330 module_exit(cfg80211_exit);
1331