1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This is the linux wireless configuration interface.
4 *
5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2015-2017 Intel Deutschland GmbH
8 * Copyright (C) 2018-2024 Intel Corporation
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/if.h>
14 #include <linux/module.h>
15 #include <linux/err.h>
16 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/nl80211.h>
19 #include <linux/debugfs.h>
20 #include <linux/notifier.h>
21 #include <linux/device.h>
22 #include <linux/etherdevice.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/sched.h>
25 #include <net/genetlink.h>
26 #include <net/cfg80211.h>
27 #include "nl80211.h"
28 #include "core.h"
29 #include "sysfs.h"
30 #include "debugfs.h"
31 #include "wext-compat.h"
32 #include "rdev-ops.h"
33
34 /* name for sysfs, %d is appended */
35 #define PHY_NAME "phy"
36
37 MODULE_AUTHOR("Johannes Berg");
38 MODULE_LICENSE("GPL");
39 MODULE_DESCRIPTION("wireless configuration support");
40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
41
42 /* RCU-protected (and RTNL for writers) */
43 LIST_HEAD(cfg80211_rdev_list);
44 int cfg80211_rdev_list_generation;
45
46 /* for debugfs */
47 static struct dentry *ieee80211_debugfs_dir;
48
49 /* for the cleanup, scan and event works */
50 struct workqueue_struct *cfg80211_wq;
51
52 static bool cfg80211_disable_40mhz_24ghz;
53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
55 "Disable 40MHz support in the 2.4GHz band");
56
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
58 {
59 struct cfg80211_registered_device *result = NULL, *rdev;
60
61 ASSERT_RTNL();
62
63 for_each_rdev(rdev) {
64 if (rdev->wiphy_idx == wiphy_idx) {
65 result = rdev;
66 break;
67 }
68 }
69
70 return result;
71 }
72
get_wiphy_idx(struct wiphy * wiphy)73 int get_wiphy_idx(struct wiphy *wiphy)
74 {
75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
76
77 return rdev->wiphy_idx;
78 }
79
wiphy_idx_to_wiphy(int wiphy_idx)80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
81 {
82 struct cfg80211_registered_device *rdev;
83
84 ASSERT_RTNL();
85
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
87 if (!rdev)
88 return NULL;
89 return &rdev->wiphy;
90 }
91
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
93 const char *newname)
94 {
95 struct cfg80211_registered_device *rdev2;
96 int wiphy_idx, taken = -1, digits;
97
98 ASSERT_RTNL();
99
100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
101 return -EINVAL;
102
103 /* prohibit calling the thing phy%d when %d is not its number */
104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
106 /* count number of places needed to print wiphy_idx */
107 digits = 1;
108 while (wiphy_idx /= 10)
109 digits++;
110 /*
111 * deny the name if it is phy<idx> where <idx> is printed
112 * without leading zeroes. taken == strlen(newname) here
113 */
114 if (taken == strlen(PHY_NAME) + digits)
115 return -EINVAL;
116 }
117
118 /* Ensure another device does not already have this name. */
119 for_each_rdev(rdev2)
120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
121 return -EINVAL;
122
123 return 0;
124 }
125
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
127 char *newname)
128 {
129 int result;
130
131 ASSERT_RTNL();
132 lockdep_assert_wiphy(&rdev->wiphy);
133
134 /* Ignore nop renames */
135 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
136 return 0;
137
138 result = cfg80211_dev_check_name(rdev, newname);
139 if (result < 0)
140 return result;
141
142 result = device_rename(&rdev->wiphy.dev, newname);
143 if (result)
144 return result;
145
146 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
147 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
148 rdev->wiphy.debugfsdir,
149 rdev->wiphy.debugfsdir->d_parent, newname);
150
151 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
152
153 return 0;
154 }
155
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
157 struct net *net)
158 {
159 struct wireless_dev *wdev;
160 int err = 0;
161
162 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
163 return -EOPNOTSUPP;
164
165 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
166 if (!wdev->netdev)
167 continue;
168 wdev->netdev->netns_local = false;
169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
170 if (err)
171 break;
172 wdev->netdev->netns_local = true;
173 }
174
175 if (err) {
176 /* failed -- clean up to old netns */
177 net = wiphy_net(&rdev->wiphy);
178
179 list_for_each_entry_continue_reverse(wdev,
180 &rdev->wiphy.wdev_list,
181 list) {
182 if (!wdev->netdev)
183 continue;
184 wdev->netdev->netns_local = false;
185 err = dev_change_net_namespace(wdev->netdev, net,
186 "wlan%d");
187 WARN_ON(err);
188 wdev->netdev->netns_local = true;
189 }
190
191 return err;
192 }
193
194 wiphy_lock(&rdev->wiphy);
195 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
196 if (!wdev->netdev)
197 continue;
198 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
199 }
200
201 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
202
203 wiphy_net_set(&rdev->wiphy, net);
204
205 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
206 WARN_ON(err);
207
208 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
209
210 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
211 if (!wdev->netdev)
212 continue;
213 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
214 }
215 wiphy_unlock(&rdev->wiphy);
216
217 return 0;
218 }
219
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
221 {
222 struct cfg80211_registered_device *rdev = data;
223
224 wiphy_lock(&rdev->wiphy);
225 rdev_rfkill_poll(rdev);
226 wiphy_unlock(&rdev->wiphy);
227 }
228
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)229 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
230 struct wireless_dev *wdev)
231 {
232 lockdep_assert_held(&rdev->wiphy.mtx);
233
234 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
235 return;
236
237 if (!wdev_running(wdev))
238 return;
239
240 rdev_stop_p2p_device(rdev, wdev);
241 wdev->is_running = false;
242
243 rdev->opencount--;
244
245 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
246 if (WARN_ON(!rdev->scan_req->notified &&
247 (!rdev->int_scan_req ||
248 !rdev->int_scan_req->notified)))
249 rdev->scan_req->info.aborted = true;
250 ___cfg80211_scan_done(rdev, false);
251 }
252 }
253
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)254 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
255 struct wireless_dev *wdev)
256 {
257 lockdep_assert_held(&rdev->wiphy.mtx);
258
259 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
260 return;
261
262 if (!wdev_running(wdev))
263 return;
264
265 rdev_stop_nan(rdev, wdev);
266 wdev->is_running = false;
267
268 rdev->opencount--;
269 }
270
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)271 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
272 {
273 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
274 struct wireless_dev *wdev;
275
276 ASSERT_RTNL();
277
278 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
279 if (wdev->netdev) {
280 dev_close(wdev->netdev);
281 continue;
282 }
283
284 /* otherwise, check iftype */
285
286 wiphy_lock(wiphy);
287
288 switch (wdev->iftype) {
289 case NL80211_IFTYPE_P2P_DEVICE:
290 cfg80211_stop_p2p_device(rdev, wdev);
291 break;
292 case NL80211_IFTYPE_NAN:
293 cfg80211_stop_nan(rdev, wdev);
294 break;
295 default:
296 break;
297 }
298
299 wiphy_unlock(wiphy);
300 }
301 }
302 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
303
cfg80211_rfkill_set_block(void * data,bool blocked)304 static int cfg80211_rfkill_set_block(void *data, bool blocked)
305 {
306 struct cfg80211_registered_device *rdev = data;
307
308 if (!blocked)
309 return 0;
310
311 rtnl_lock();
312 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
313 rtnl_unlock();
314
315 return 0;
316 }
317
cfg80211_rfkill_block_work(struct work_struct * work)318 static void cfg80211_rfkill_block_work(struct work_struct *work)
319 {
320 struct cfg80211_registered_device *rdev;
321
322 rdev = container_of(work, struct cfg80211_registered_device,
323 rfkill_block);
324 cfg80211_rfkill_set_block(rdev, true);
325 }
326
cfg80211_event_work(struct work_struct * work)327 static void cfg80211_event_work(struct work_struct *work)
328 {
329 struct cfg80211_registered_device *rdev;
330
331 rdev = container_of(work, struct cfg80211_registered_device,
332 event_work);
333
334 wiphy_lock(&rdev->wiphy);
335 cfg80211_process_rdev_events(rdev);
336 wiphy_unlock(&rdev->wiphy);
337 }
338
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)339 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
340 {
341 struct wireless_dev *wdev, *tmp;
342
343 ASSERT_RTNL();
344
345 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
346 if (wdev->nl_owner_dead) {
347 if (wdev->netdev)
348 dev_close(wdev->netdev);
349
350 wiphy_lock(&rdev->wiphy);
351 cfg80211_leave(rdev, wdev);
352 cfg80211_remove_virtual_intf(rdev, wdev);
353 wiphy_unlock(&rdev->wiphy);
354 }
355 }
356 }
357
cfg80211_destroy_iface_wk(struct work_struct * work)358 static void cfg80211_destroy_iface_wk(struct work_struct *work)
359 {
360 struct cfg80211_registered_device *rdev;
361
362 rdev = container_of(work, struct cfg80211_registered_device,
363 destroy_work);
364
365 rtnl_lock();
366 cfg80211_destroy_ifaces(rdev);
367 rtnl_unlock();
368 }
369
cfg80211_sched_scan_stop_wk(struct wiphy * wiphy,struct wiphy_work * work)370 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
371 struct wiphy_work *work)
372 {
373 struct cfg80211_registered_device *rdev;
374 struct cfg80211_sched_scan_request *req, *tmp;
375
376 rdev = container_of(work, struct cfg80211_registered_device,
377 sched_scan_stop_wk);
378
379 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
380 if (req->nl_owner_dead)
381 cfg80211_stop_sched_scan_req(rdev, req, false);
382 }
383 }
384
cfg80211_propagate_radar_detect_wk(struct work_struct * work)385 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
386 {
387 struct cfg80211_registered_device *rdev;
388
389 rdev = container_of(work, struct cfg80211_registered_device,
390 propagate_radar_detect_wk);
391
392 rtnl_lock();
393
394 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
395 NL80211_DFS_UNAVAILABLE,
396 NL80211_RADAR_DETECTED);
397
398 rtnl_unlock();
399 }
400
cfg80211_propagate_cac_done_wk(struct work_struct * work)401 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
402 {
403 struct cfg80211_registered_device *rdev;
404
405 rdev = container_of(work, struct cfg80211_registered_device,
406 propagate_cac_done_wk);
407
408 rtnl_lock();
409
410 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
411 NL80211_DFS_AVAILABLE,
412 NL80211_RADAR_CAC_FINISHED);
413
414 rtnl_unlock();
415 }
416
cfg80211_wiphy_work(struct work_struct * work)417 static void cfg80211_wiphy_work(struct work_struct *work)
418 {
419 struct cfg80211_registered_device *rdev;
420 struct wiphy_work *wk;
421
422 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
423
424 trace_wiphy_work_worker_start(&rdev->wiphy);
425
426 wiphy_lock(&rdev->wiphy);
427 if (rdev->suspended)
428 goto out;
429
430 spin_lock_irq(&rdev->wiphy_work_lock);
431 wk = list_first_entry_or_null(&rdev->wiphy_work_list,
432 struct wiphy_work, entry);
433 if (wk) {
434 list_del_init(&wk->entry);
435 if (!list_empty(&rdev->wiphy_work_list))
436 queue_work(system_unbound_wq, work);
437 spin_unlock_irq(&rdev->wiphy_work_lock);
438
439 trace_wiphy_work_run(&rdev->wiphy, wk);
440 wk->func(&rdev->wiphy, wk);
441 } else {
442 spin_unlock_irq(&rdev->wiphy_work_lock);
443 }
444 out:
445 wiphy_unlock(&rdev->wiphy);
446 }
447
448 /* exported functions */
449
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)450 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
451 const char *requested_name)
452 {
453 static atomic_t wiphy_counter = ATOMIC_INIT(0);
454
455 struct cfg80211_registered_device *rdev;
456 int alloc_size;
457
458 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
459 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
460 WARN_ON(ops->connect && !ops->disconnect);
461 WARN_ON(ops->join_ibss && !ops->leave_ibss);
462 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
463 WARN_ON(ops->add_station && !ops->del_station);
464 WARN_ON(ops->add_mpath && !ops->del_mpath);
465 WARN_ON(ops->join_mesh && !ops->leave_mesh);
466 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
467 WARN_ON(ops->start_ap && !ops->stop_ap);
468 WARN_ON(ops->join_ocb && !ops->leave_ocb);
469 WARN_ON(ops->suspend && !ops->resume);
470 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
471 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
472 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
473 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
474
475 alloc_size = sizeof(*rdev) + sizeof_priv;
476
477 rdev = kzalloc(alloc_size, GFP_KERNEL);
478 if (!rdev)
479 return NULL;
480
481 rdev->ops = ops;
482
483 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
484
485 if (unlikely(rdev->wiphy_idx < 0)) {
486 /* ugh, wrapped! */
487 atomic_dec(&wiphy_counter);
488 kfree(rdev);
489 return NULL;
490 }
491
492 /* atomic_inc_return makes it start at 1, make it start at 0 */
493 rdev->wiphy_idx--;
494
495 /* give it a proper name */
496 if (requested_name && requested_name[0]) {
497 int rv;
498
499 rtnl_lock();
500 rv = cfg80211_dev_check_name(rdev, requested_name);
501
502 if (rv < 0) {
503 rtnl_unlock();
504 goto use_default_name;
505 }
506
507 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
508 rtnl_unlock();
509 if (rv)
510 goto use_default_name;
511 } else {
512 int rv;
513
514 use_default_name:
515 /* NOTE: This is *probably* safe w/out holding rtnl because of
516 * the restrictions on phy names. Probably this call could
517 * fail if some other part of the kernel (re)named a device
518 * phyX. But, might should add some locking and check return
519 * value, and use a different name if this one exists?
520 */
521 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
522 if (rv < 0) {
523 kfree(rdev);
524 return NULL;
525 }
526 }
527
528 mutex_init(&rdev->wiphy.mtx);
529 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
530 INIT_LIST_HEAD(&rdev->beacon_registrations);
531 spin_lock_init(&rdev->beacon_registrations_lock);
532 spin_lock_init(&rdev->bss_lock);
533 INIT_LIST_HEAD(&rdev->bss_list);
534 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
535 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
536 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
537 cfg80211_dfs_channels_update_work);
538 #ifdef CONFIG_CFG80211_WEXT
539 rdev->wiphy.wext = &cfg80211_wext_handler;
540 #endif
541
542 device_initialize(&rdev->wiphy.dev);
543 rdev->wiphy.dev.class = &ieee80211_class;
544 rdev->wiphy.dev.platform_data = rdev;
545 device_enable_async_suspend(&rdev->wiphy.dev);
546
547 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
548 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
549 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
550 INIT_WORK(&rdev->propagate_radar_detect_wk,
551 cfg80211_propagate_radar_detect_wk);
552 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
553 INIT_WORK(&rdev->mgmt_registrations_update_wk,
554 cfg80211_mgmt_registrations_update_wk);
555 spin_lock_init(&rdev->mgmt_registrations_lock);
556
557 #ifdef CONFIG_CFG80211_DEFAULT_PS
558 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
559 #endif
560
561 wiphy_net_set(&rdev->wiphy, &init_net);
562
563 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
564 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
565 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
566 &rdev->rfkill_ops, rdev);
567
568 if (!rdev->wiphy.rfkill) {
569 wiphy_free(&rdev->wiphy);
570 return NULL;
571 }
572
573 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
574 INIT_LIST_HEAD(&rdev->wiphy_work_list);
575 spin_lock_init(&rdev->wiphy_work_lock);
576 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
577 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
578 INIT_WORK(&rdev->event_work, cfg80211_event_work);
579 INIT_WORK(&rdev->background_cac_abort_wk,
580 cfg80211_background_cac_abort_wk);
581 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
582 cfg80211_background_cac_done_wk);
583
584 init_waitqueue_head(&rdev->dev_wait);
585
586 /*
587 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
588 * Fragmentation and RTS threshold are disabled by default with the
589 * special -1 value.
590 */
591 rdev->wiphy.retry_short = 7;
592 rdev->wiphy.retry_long = 4;
593 rdev->wiphy.frag_threshold = (u32) -1;
594 rdev->wiphy.rts_threshold = (u32) -1;
595 rdev->wiphy.coverage_class = 0;
596
597 rdev->wiphy.max_num_csa_counters = 1;
598
599 rdev->wiphy.max_sched_scan_plans = 1;
600 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
601
602 return &rdev->wiphy;
603 }
604 EXPORT_SYMBOL(wiphy_new_nm);
605
606 static
wiphy_verify_iface_combinations(struct wiphy * wiphy,const struct ieee80211_iface_combination * iface_comb,int n_iface_comb,bool combined_radio)607 int wiphy_verify_iface_combinations(struct wiphy *wiphy,
608 const struct ieee80211_iface_combination *iface_comb,
609 int n_iface_comb,
610 bool combined_radio)
611 {
612 const struct ieee80211_iface_combination *c;
613 int i, j;
614
615 for (i = 0; i < n_iface_comb; i++) {
616 u32 cnt = 0;
617 u16 all_iftypes = 0;
618
619 c = &iface_comb[i];
620
621 /*
622 * Combinations with just one interface aren't real,
623 * however we make an exception for DFS.
624 */
625 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
626 return -EINVAL;
627
628 /* Need at least one channel */
629 if (WARN_ON(!c->num_different_channels))
630 return -EINVAL;
631
632 /* DFS only works on one channel. Avoid this check
633 * for multi-radio global combination, since it hold
634 * the capabilities of all radio combinations.
635 */
636 if (!combined_radio &&
637 WARN_ON(c->radar_detect_widths &&
638 c->num_different_channels > 1))
639 return -EINVAL;
640
641 if (WARN_ON(!c->n_limits))
642 return -EINVAL;
643
644 for (j = 0; j < c->n_limits; j++) {
645 u16 types = c->limits[j].types;
646
647 /* interface types shouldn't overlap */
648 if (WARN_ON(types & all_iftypes))
649 return -EINVAL;
650 all_iftypes |= types;
651
652 if (WARN_ON(!c->limits[j].max))
653 return -EINVAL;
654
655 /* Shouldn't list software iftypes in combinations! */
656 if (WARN_ON(wiphy->software_iftypes & types))
657 return -EINVAL;
658
659 /* Only a single P2P_DEVICE can be allowed, avoid this
660 * check for multi-radio global combination, since it
661 * hold the capabilities of all radio combinations.
662 */
663 if (!combined_radio &&
664 WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
665 c->limits[j].max > 1))
666 return -EINVAL;
667
668 /* Only a single NAN can be allowed, avoid this
669 * check for multi-radio global combination, since it
670 * hold the capabilities of all radio combinations.
671 */
672 if (!combined_radio &&
673 WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
674 c->limits[j].max > 1))
675 return -EINVAL;
676
677 /*
678 * This isn't well-defined right now. If you have an
679 * IBSS interface, then its beacon interval may change
680 * by joining other networks, and nothing prevents it
681 * from doing that.
682 * So technically we probably shouldn't even allow AP
683 * and IBSS in the same interface, but it seems that
684 * some drivers support that, possibly only with fixed
685 * beacon intervals for IBSS.
686 */
687 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
688 c->beacon_int_min_gcd)) {
689 return -EINVAL;
690 }
691
692 cnt += c->limits[j].max;
693 /*
694 * Don't advertise an unsupported type
695 * in a combination.
696 */
697 if (WARN_ON((wiphy->interface_modes & types) != types))
698 return -EINVAL;
699 }
700
701 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
702 return -EINVAL;
703
704 /* You can't even choose that many! */
705 if (WARN_ON(cnt < c->max_interfaces))
706 return -EINVAL;
707 }
708
709 return 0;
710 }
711
wiphy_verify_combinations(struct wiphy * wiphy)712 static int wiphy_verify_combinations(struct wiphy *wiphy)
713 {
714 int i, ret;
715 bool combined_radio = false;
716
717 if (wiphy->n_radio) {
718 for (i = 0; i < wiphy->n_radio; i++) {
719 const struct wiphy_radio *radio = &wiphy->radio[i];
720
721 ret = wiphy_verify_iface_combinations(wiphy,
722 radio->iface_combinations,
723 radio->n_iface_combinations,
724 false);
725 if (ret)
726 return ret;
727 }
728
729 combined_radio = true;
730 }
731
732 ret = wiphy_verify_iface_combinations(wiphy,
733 wiphy->iface_combinations,
734 wiphy->n_iface_combinations,
735 combined_radio);
736
737 return ret;
738 }
739
wiphy_register(struct wiphy * wiphy)740 int wiphy_register(struct wiphy *wiphy)
741 {
742 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
743 int res;
744 enum nl80211_band band;
745 struct ieee80211_supported_band *sband;
746 bool have_band = false;
747 int i;
748 u16 ifmodes = wiphy->interface_modes;
749
750 #ifdef CONFIG_PM
751 if (WARN_ON(wiphy->wowlan &&
752 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
753 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
754 return -EINVAL;
755 if (WARN_ON(wiphy->wowlan &&
756 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
757 !wiphy->wowlan->tcp))
758 return -EINVAL;
759 #endif
760 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
761 (!rdev->ops->tdls_channel_switch ||
762 !rdev->ops->tdls_cancel_channel_switch)))
763 return -EINVAL;
764
765 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
766 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
767 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
768 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
769 return -EINVAL;
770
771 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
772 return -EINVAL;
773
774 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
775 return -EINVAL;
776
777 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
778 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
779 !wiphy->pmsr_capa->ftm.non_asap))
780 return -EINVAL;
781 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
782 !wiphy->pmsr_capa->ftm.bandwidths))
783 return -EINVAL;
784 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
785 ~(BIT(NL80211_PREAMBLE_LEGACY) |
786 BIT(NL80211_PREAMBLE_HT) |
787 BIT(NL80211_PREAMBLE_VHT) |
788 BIT(NL80211_PREAMBLE_HE) |
789 BIT(NL80211_PREAMBLE_DMG))))
790 return -EINVAL;
791 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
792 wiphy->pmsr_capa->ftm.non_trigger_based) &&
793 !(wiphy->pmsr_capa->ftm.preambles &
794 BIT(NL80211_PREAMBLE_HE))))
795 return -EINVAL;
796 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
797 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
798 BIT(NL80211_CHAN_WIDTH_20) |
799 BIT(NL80211_CHAN_WIDTH_40) |
800 BIT(NL80211_CHAN_WIDTH_80) |
801 BIT(NL80211_CHAN_WIDTH_80P80) |
802 BIT(NL80211_CHAN_WIDTH_160) |
803 BIT(NL80211_CHAN_WIDTH_5) |
804 BIT(NL80211_CHAN_WIDTH_10))))
805 return -EINVAL;
806 }
807
808 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
809 (wiphy->regulatory_flags &
810 (REGULATORY_CUSTOM_REG |
811 REGULATORY_STRICT_REG |
812 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
813 REGULATORY_COUNTRY_IE_IGNORE))))
814 return -EINVAL;
815
816 if (WARN_ON(wiphy->coalesce &&
817 (!wiphy->coalesce->n_rules ||
818 !wiphy->coalesce->n_patterns) &&
819 (!wiphy->coalesce->pattern_min_len ||
820 wiphy->coalesce->pattern_min_len >
821 wiphy->coalesce->pattern_max_len)))
822 return -EINVAL;
823
824 if (WARN_ON(wiphy->ap_sme_capa &&
825 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
826 return -EINVAL;
827
828 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
829 return -EINVAL;
830
831 if (WARN_ON(wiphy->addresses &&
832 !is_zero_ether_addr(wiphy->perm_addr) &&
833 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
834 ETH_ALEN)))
835 return -EINVAL;
836
837 if (WARN_ON(wiphy->max_acl_mac_addrs &&
838 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
839 !rdev->ops->set_mac_acl)))
840 return -EINVAL;
841
842 /* assure only valid behaviours are flagged by driver
843 * hence subtract 2 as bit 0 is invalid.
844 */
845 if (WARN_ON(wiphy->bss_select_support &&
846 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
847 return -EINVAL;
848
849 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
850 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
851 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
852 return -EINVAL;
853
854 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
855 rdev->ops->update_connect_params))
856 return -EINVAL;
857
858 if (wiphy->addresses)
859 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
860
861 /* sanity check ifmodes */
862 WARN_ON(!ifmodes);
863 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
864 if (WARN_ON(ifmodes != wiphy->interface_modes))
865 wiphy->interface_modes = ifmodes;
866
867 res = wiphy_verify_combinations(wiphy);
868 if (res)
869 return res;
870
871 /* sanity check supported bands/channels */
872 for (band = 0; band < NUM_NL80211_BANDS; band++) {
873 const struct ieee80211_sband_iftype_data *iftd;
874 u16 types = 0;
875 bool have_he = false;
876
877 sband = wiphy->bands[band];
878 if (!sband)
879 continue;
880
881 sband->band = band;
882 if (WARN_ON(!sband->n_channels))
883 return -EINVAL;
884 /*
885 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
886 * n_bitrates is 0
887 */
888 if (WARN_ON((band != NL80211_BAND_60GHZ &&
889 band != NL80211_BAND_S1GHZ) &&
890 !sband->n_bitrates))
891 return -EINVAL;
892
893 if (WARN_ON(band == NL80211_BAND_6GHZ &&
894 (sband->ht_cap.ht_supported ||
895 sband->vht_cap.vht_supported)))
896 return -EINVAL;
897
898 /*
899 * Since cfg80211_disable_40mhz_24ghz is global, we can
900 * modify the sband's ht data even if the driver uses a
901 * global structure for that.
902 */
903 if (cfg80211_disable_40mhz_24ghz &&
904 band == NL80211_BAND_2GHZ &&
905 sband->ht_cap.ht_supported) {
906 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
907 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
908 }
909
910 /*
911 * Since we use a u32 for rate bitmaps in
912 * ieee80211_get_response_rate, we cannot
913 * have more than 32 legacy rates.
914 */
915 if (WARN_ON(sband->n_bitrates > 32))
916 return -EINVAL;
917
918 for (i = 0; i < sband->n_channels; i++) {
919 sband->channels[i].orig_flags =
920 sband->channels[i].flags;
921 sband->channels[i].orig_mag = INT_MAX;
922 sband->channels[i].orig_mpwr =
923 sband->channels[i].max_power;
924 sband->channels[i].band = band;
925
926 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
927 return -EINVAL;
928 }
929
930 for_each_sband_iftype_data(sband, i, iftd) {
931 bool has_ap, has_non_ap;
932 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
933 BIT(NL80211_IFTYPE_P2P_GO);
934
935 if (WARN_ON(!iftd->types_mask))
936 return -EINVAL;
937 if (WARN_ON(types & iftd->types_mask))
938 return -EINVAL;
939
940 /* at least one piece of information must be present */
941 if (WARN_ON(!iftd->he_cap.has_he))
942 return -EINVAL;
943
944 types |= iftd->types_mask;
945
946 if (i == 0)
947 have_he = iftd->he_cap.has_he;
948 else
949 have_he = have_he &&
950 iftd->he_cap.has_he;
951
952 has_ap = iftd->types_mask & ap_bits;
953 has_non_ap = iftd->types_mask & ~ap_bits;
954
955 /*
956 * For EHT 20 MHz STA, the capabilities format differs
957 * but to simplify, don't check 20 MHz but rather check
958 * only if AP and non-AP were mentioned at the same time,
959 * reject if so.
960 */
961 if (WARN_ON(iftd->eht_cap.has_eht &&
962 has_ap && has_non_ap))
963 return -EINVAL;
964 }
965
966 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
967 return -EINVAL;
968
969 have_band = true;
970 }
971
972 if (!have_band) {
973 WARN_ON(1);
974 return -EINVAL;
975 }
976
977 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
978 /*
979 * Validate we have a policy (can be explicitly set to
980 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
981 * we have at least one of doit/dumpit.
982 */
983 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
984 return -EINVAL;
985 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
986 !rdev->wiphy.vendor_commands[i].dumpit))
987 return -EINVAL;
988 }
989
990 #ifdef CONFIG_PM
991 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
992 (!rdev->wiphy.wowlan->pattern_min_len ||
993 rdev->wiphy.wowlan->pattern_min_len >
994 rdev->wiphy.wowlan->pattern_max_len)))
995 return -EINVAL;
996 #endif
997
998 if (!wiphy->max_num_akm_suites)
999 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
1000 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
1001 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
1002 return -EINVAL;
1003
1004 /* check and set up bitrates */
1005 ieee80211_set_bitrate_flags(wiphy);
1006
1007 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
1008
1009 rtnl_lock();
1010 wiphy_lock(&rdev->wiphy);
1011 res = device_add(&rdev->wiphy.dev);
1012 if (res) {
1013 wiphy_unlock(&rdev->wiphy);
1014 rtnl_unlock();
1015 return res;
1016 }
1017
1018 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
1019 cfg80211_rdev_list_generation++;
1020
1021 /* add to debugfs */
1022 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
1023 ieee80211_debugfs_dir);
1024
1025 cfg80211_debugfs_rdev_add(rdev);
1026 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
1027 wiphy_unlock(&rdev->wiphy);
1028
1029 /* set up regulatory info */
1030 wiphy_regulatory_register(wiphy);
1031
1032 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1033 struct regulatory_request request;
1034
1035 request.wiphy_idx = get_wiphy_idx(wiphy);
1036 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
1037 request.alpha2[0] = '9';
1038 request.alpha2[1] = '9';
1039
1040 nl80211_send_reg_change_event(&request);
1041 }
1042
1043 /* Check that nobody globally advertises any capabilities they do not
1044 * advertise on all possible interface types.
1045 */
1046 if (wiphy->extended_capabilities_len &&
1047 wiphy->num_iftype_ext_capab &&
1048 wiphy->iftype_ext_capab) {
1049 u8 supported_on_all, j;
1050 const struct wiphy_iftype_ext_capab *capab;
1051
1052 capab = wiphy->iftype_ext_capab;
1053 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1054 if (capab[0].extended_capabilities_len > j)
1055 supported_on_all =
1056 capab[0].extended_capabilities[j];
1057 else
1058 supported_on_all = 0x00;
1059 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1060 if (j >= capab[i].extended_capabilities_len) {
1061 supported_on_all = 0x00;
1062 break;
1063 }
1064 supported_on_all &=
1065 capab[i].extended_capabilities[j];
1066 }
1067 if (WARN_ON(wiphy->extended_capabilities[j] &
1068 ~supported_on_all))
1069 break;
1070 }
1071 }
1072
1073 rdev->wiphy.registered = true;
1074 rtnl_unlock();
1075
1076 res = rfkill_register(rdev->wiphy.rfkill);
1077 if (res) {
1078 rfkill_destroy(rdev->wiphy.rfkill);
1079 rdev->wiphy.rfkill = NULL;
1080 wiphy_unregister(&rdev->wiphy);
1081 return res;
1082 }
1083
1084 return 0;
1085 }
1086 EXPORT_SYMBOL(wiphy_register);
1087
wiphy_rfkill_start_polling(struct wiphy * wiphy)1088 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1089 {
1090 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1091
1092 if (!rdev->ops->rfkill_poll)
1093 return;
1094 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1095 rfkill_resume_polling(wiphy->rfkill);
1096 }
1097 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1098
cfg80211_process_wiphy_works(struct cfg80211_registered_device * rdev,struct wiphy_work * end)1099 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1100 struct wiphy_work *end)
1101 {
1102 unsigned int runaway_limit = 100;
1103 unsigned long flags;
1104
1105 lockdep_assert_held(&rdev->wiphy.mtx);
1106
1107 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1108 while (!list_empty(&rdev->wiphy_work_list)) {
1109 struct wiphy_work *wk;
1110
1111 wk = list_first_entry(&rdev->wiphy_work_list,
1112 struct wiphy_work, entry);
1113 list_del_init(&wk->entry);
1114 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1115
1116 trace_wiphy_work_run(&rdev->wiphy, wk);
1117 wk->func(&rdev->wiphy, wk);
1118
1119 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1120
1121 if (wk == end)
1122 break;
1123
1124 if (WARN_ON(--runaway_limit == 0))
1125 INIT_LIST_HEAD(&rdev->wiphy_work_list);
1126 }
1127 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1128 }
1129
wiphy_unregister(struct wiphy * wiphy)1130 void wiphy_unregister(struct wiphy *wiphy)
1131 {
1132 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1133
1134 wait_event(rdev->dev_wait, ({
1135 int __count;
1136 wiphy_lock(&rdev->wiphy);
1137 __count = rdev->opencount;
1138 wiphy_unlock(&rdev->wiphy);
1139 __count == 0; }));
1140
1141 if (rdev->wiphy.rfkill)
1142 rfkill_unregister(rdev->wiphy.rfkill);
1143
1144 rtnl_lock();
1145 wiphy_lock(&rdev->wiphy);
1146 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1147 rdev->wiphy.registered = false;
1148
1149 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1150
1151 /*
1152 * First remove the hardware from everywhere, this makes
1153 * it impossible to find from userspace.
1154 */
1155 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1156 list_del_rcu(&rdev->list);
1157 synchronize_rcu();
1158
1159 /*
1160 * If this device got a regulatory hint tell core its
1161 * free to listen now to a new shiny device regulatory hint
1162 */
1163 wiphy_regulatory_deregister(wiphy);
1164
1165 cfg80211_rdev_list_generation++;
1166 device_del(&rdev->wiphy.dev);
1167
1168 #ifdef CONFIG_PM
1169 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1170 rdev_set_wakeup(rdev, false);
1171 #endif
1172
1173 /* surely nothing is reachable now, clean up work */
1174 cfg80211_process_wiphy_works(rdev, NULL);
1175 wiphy_unlock(&rdev->wiphy);
1176 rtnl_unlock();
1177
1178 /* this has nothing to do now but make sure it's gone */
1179 cancel_work_sync(&rdev->wiphy_work);
1180
1181 cancel_work_sync(&rdev->conn_work);
1182 flush_work(&rdev->event_work);
1183 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1184 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1185 flush_work(&rdev->destroy_work);
1186 flush_work(&rdev->propagate_radar_detect_wk);
1187 flush_work(&rdev->propagate_cac_done_wk);
1188 flush_work(&rdev->mgmt_registrations_update_wk);
1189 flush_work(&rdev->background_cac_abort_wk);
1190
1191 cfg80211_rdev_free_wowlan(rdev);
1192 cfg80211_free_coalesce(rdev->coalesce);
1193 rdev->coalesce = NULL;
1194 }
1195 EXPORT_SYMBOL(wiphy_unregister);
1196
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1197 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1198 {
1199 struct cfg80211_internal_bss *scan, *tmp;
1200 struct cfg80211_beacon_registration *reg, *treg;
1201 rfkill_destroy(rdev->wiphy.rfkill);
1202 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1203 list_del(®->list);
1204 kfree(reg);
1205 }
1206 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1207 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1208 mutex_destroy(&rdev->wiphy.mtx);
1209
1210 /*
1211 * The 'regd' can only be non-NULL if we never finished
1212 * initializing the wiphy and thus never went through the
1213 * unregister path - e.g. in failure scenarios. Thus, it
1214 * cannot have been visible to anyone if non-NULL, so we
1215 * can just free it here.
1216 */
1217 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1218
1219 kfree(rdev);
1220 }
1221
wiphy_free(struct wiphy * wiphy)1222 void wiphy_free(struct wiphy *wiphy)
1223 {
1224 put_device(&wiphy->dev);
1225 }
1226 EXPORT_SYMBOL(wiphy_free);
1227
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1228 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1229 enum rfkill_hard_block_reasons reason)
1230 {
1231 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1232
1233 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1234 schedule_work(&rdev->rfkill_block);
1235 }
1236 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1237
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1238 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1239 bool unregister_netdev)
1240 {
1241 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1242 struct cfg80211_cqm_config *cqm_config;
1243 unsigned int link_id;
1244
1245 ASSERT_RTNL();
1246 lockdep_assert_held(&rdev->wiphy.mtx);
1247
1248 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1249
1250 wdev->registered = false;
1251
1252 if (wdev->netdev) {
1253 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1254 if (unregister_netdev)
1255 unregister_netdevice(wdev->netdev);
1256 }
1257
1258 list_del_rcu(&wdev->list);
1259 synchronize_net();
1260 rdev->devlist_generation++;
1261
1262 cfg80211_mlme_purge_registrations(wdev);
1263
1264 switch (wdev->iftype) {
1265 case NL80211_IFTYPE_P2P_DEVICE:
1266 cfg80211_stop_p2p_device(rdev, wdev);
1267 break;
1268 case NL80211_IFTYPE_NAN:
1269 cfg80211_stop_nan(rdev, wdev);
1270 break;
1271 default:
1272 break;
1273 }
1274
1275 #ifdef CONFIG_CFG80211_WEXT
1276 kfree_sensitive(wdev->wext.keys);
1277 wdev->wext.keys = NULL;
1278 #endif
1279 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1280 /* deleted from the list, so can't be found from nl80211 any more */
1281 cqm_config = rcu_access_pointer(wdev->cqm_config);
1282 kfree_rcu(cqm_config, rcu_head);
1283 RCU_INIT_POINTER(wdev->cqm_config, NULL);
1284
1285 /*
1286 * Ensure that all events have been processed and
1287 * freed.
1288 */
1289 cfg80211_process_wdev_events(wdev);
1290
1291 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1292 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1293 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1294 struct cfg80211_internal_bss *curbss;
1295
1296 curbss = wdev->links[link_id].client.current_bss;
1297
1298 if (WARN_ON(curbss)) {
1299 cfg80211_unhold_bss(curbss);
1300 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1301 wdev->links[link_id].client.current_bss = NULL;
1302 }
1303 }
1304 }
1305
1306 wdev->connected = false;
1307 }
1308
cfg80211_unregister_wdev(struct wireless_dev * wdev)1309 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1310 {
1311 _cfg80211_unregister_wdev(wdev, true);
1312 }
1313 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1314
1315 static const struct device_type wiphy_type = {
1316 .name = "wlan",
1317 };
1318
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1319 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1320 enum nl80211_iftype iftype, int num)
1321 {
1322 lockdep_assert_held(&rdev->wiphy.mtx);
1323
1324 rdev->num_running_ifaces += num;
1325 if (iftype == NL80211_IFTYPE_MONITOR)
1326 rdev->num_running_monitor_ifaces += num;
1327 }
1328
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1329 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1330 struct wireless_dev *wdev)
1331 {
1332 struct net_device *dev = wdev->netdev;
1333 struct cfg80211_sched_scan_request *pos, *tmp;
1334
1335 lockdep_assert_held(&rdev->wiphy.mtx);
1336
1337 cfg80211_pmsr_wdev_down(wdev);
1338
1339 cfg80211_stop_background_radar_detection(wdev);
1340
1341 switch (wdev->iftype) {
1342 case NL80211_IFTYPE_ADHOC:
1343 cfg80211_leave_ibss(rdev, dev, true);
1344 break;
1345 case NL80211_IFTYPE_P2P_CLIENT:
1346 case NL80211_IFTYPE_STATION:
1347 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1348 list) {
1349 if (dev == pos->dev)
1350 cfg80211_stop_sched_scan_req(rdev, pos, false);
1351 }
1352
1353 #ifdef CONFIG_CFG80211_WEXT
1354 kfree(wdev->wext.ie);
1355 wdev->wext.ie = NULL;
1356 wdev->wext.ie_len = 0;
1357 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1358 #endif
1359 cfg80211_disconnect(rdev, dev,
1360 WLAN_REASON_DEAUTH_LEAVING, true);
1361 break;
1362 case NL80211_IFTYPE_MESH_POINT:
1363 cfg80211_leave_mesh(rdev, dev);
1364 break;
1365 case NL80211_IFTYPE_AP:
1366 case NL80211_IFTYPE_P2P_GO:
1367 cfg80211_stop_ap(rdev, dev, -1, true);
1368 break;
1369 case NL80211_IFTYPE_OCB:
1370 cfg80211_leave_ocb(rdev, dev);
1371 break;
1372 case NL80211_IFTYPE_P2P_DEVICE:
1373 case NL80211_IFTYPE_NAN:
1374 /* cannot happen, has no netdev */
1375 break;
1376 case NL80211_IFTYPE_AP_VLAN:
1377 case NL80211_IFTYPE_MONITOR:
1378 /* nothing to do */
1379 break;
1380 case NL80211_IFTYPE_UNSPECIFIED:
1381 case NL80211_IFTYPE_WDS:
1382 case NUM_NL80211_IFTYPES:
1383 /* invalid */
1384 break;
1385 }
1386 }
1387
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1388 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1389 gfp_t gfp)
1390 {
1391 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1392 struct cfg80211_event *ev;
1393 unsigned long flags;
1394
1395 trace_cfg80211_stop_iface(wiphy, wdev);
1396
1397 ev = kzalloc(sizeof(*ev), gfp);
1398 if (!ev)
1399 return;
1400
1401 ev->type = EVENT_STOPPED;
1402
1403 spin_lock_irqsave(&wdev->event_lock, flags);
1404 list_add_tail(&ev->list, &wdev->event_list);
1405 spin_unlock_irqrestore(&wdev->event_lock, flags);
1406 queue_work(cfg80211_wq, &rdev->event_work);
1407 }
1408 EXPORT_SYMBOL(cfg80211_stop_iface);
1409
cfg80211_init_wdev(struct wireless_dev * wdev)1410 void cfg80211_init_wdev(struct wireless_dev *wdev)
1411 {
1412 INIT_LIST_HEAD(&wdev->event_list);
1413 spin_lock_init(&wdev->event_lock);
1414 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1415 INIT_LIST_HEAD(&wdev->pmsr_list);
1416 spin_lock_init(&wdev->pmsr_lock);
1417 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1418
1419 #ifdef CONFIG_CFG80211_WEXT
1420 wdev->wext.default_key = -1;
1421 wdev->wext.default_mgmt_key = -1;
1422 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1423 #endif
1424
1425 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1426
1427 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1428 wdev->ps = true;
1429 else
1430 wdev->ps = false;
1431 /* allow mac80211 to determine the timeout */
1432 wdev->ps_timeout = -1;
1433
1434 wdev->radio_mask = BIT(wdev->wiphy->n_radio) - 1;
1435
1436 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1437 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1438 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1439 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1440
1441 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1442 }
1443
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1444 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1445 struct wireless_dev *wdev)
1446 {
1447 ASSERT_RTNL();
1448 lockdep_assert_held(&rdev->wiphy.mtx);
1449
1450 /*
1451 * We get here also when the interface changes network namespaces,
1452 * as it's registered into the new one, but we don't want it to
1453 * change ID in that case. Checking if the ID is already assigned
1454 * works, because 0 isn't considered a valid ID and the memory is
1455 * 0-initialized.
1456 */
1457 if (!wdev->identifier)
1458 wdev->identifier = ++rdev->wdev_id;
1459 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1460 rdev->devlist_generation++;
1461 wdev->registered = true;
1462
1463 if (wdev->netdev &&
1464 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1465 "phy80211"))
1466 pr_err("failed to add phy80211 symlink to netdev!\n");
1467
1468 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1469 }
1470
cfg80211_register_netdevice(struct net_device * dev)1471 int cfg80211_register_netdevice(struct net_device *dev)
1472 {
1473 struct wireless_dev *wdev = dev->ieee80211_ptr;
1474 struct cfg80211_registered_device *rdev;
1475 int ret;
1476
1477 ASSERT_RTNL();
1478
1479 if (WARN_ON(!wdev))
1480 return -EINVAL;
1481
1482 rdev = wiphy_to_rdev(wdev->wiphy);
1483
1484 lockdep_assert_held(&rdev->wiphy.mtx);
1485
1486 /* we'll take care of this */
1487 wdev->registered = true;
1488 wdev->registering = true;
1489 ret = register_netdevice(dev);
1490 if (ret)
1491 goto out;
1492
1493 cfg80211_register_wdev(rdev, wdev);
1494 ret = 0;
1495 out:
1496 wdev->registering = false;
1497 if (ret)
1498 wdev->registered = false;
1499 return ret;
1500 }
1501 EXPORT_SYMBOL(cfg80211_register_netdevice);
1502
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1503 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1504 unsigned long state, void *ptr)
1505 {
1506 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1507 struct wireless_dev *wdev = dev->ieee80211_ptr;
1508 struct cfg80211_registered_device *rdev;
1509 struct cfg80211_sched_scan_request *pos, *tmp;
1510
1511 if (!wdev)
1512 return NOTIFY_DONE;
1513
1514 rdev = wiphy_to_rdev(wdev->wiphy);
1515
1516 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1517
1518 switch (state) {
1519 case NETDEV_POST_INIT:
1520 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1521 wdev->netdev = dev;
1522 /* can only change netns with wiphy */
1523 dev->netns_local = true;
1524
1525 cfg80211_init_wdev(wdev);
1526 break;
1527 case NETDEV_REGISTER:
1528 if (!wdev->registered) {
1529 wiphy_lock(&rdev->wiphy);
1530 cfg80211_register_wdev(rdev, wdev);
1531 wiphy_unlock(&rdev->wiphy);
1532 }
1533 break;
1534 case NETDEV_UNREGISTER:
1535 /*
1536 * It is possible to get NETDEV_UNREGISTER multiple times,
1537 * so check wdev->registered.
1538 */
1539 if (wdev->registered && !wdev->registering) {
1540 wiphy_lock(&rdev->wiphy);
1541 _cfg80211_unregister_wdev(wdev, false);
1542 wiphy_unlock(&rdev->wiphy);
1543 }
1544 break;
1545 case NETDEV_GOING_DOWN:
1546 wiphy_lock(&rdev->wiphy);
1547 cfg80211_leave(rdev, wdev);
1548 cfg80211_remove_links(wdev);
1549 wiphy_unlock(&rdev->wiphy);
1550 /* since we just did cfg80211_leave() nothing to do there */
1551 cancel_work_sync(&wdev->disconnect_wk);
1552 cancel_work_sync(&wdev->pmsr_free_wk);
1553 break;
1554 case NETDEV_DOWN:
1555 wiphy_lock(&rdev->wiphy);
1556 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1557 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1558 if (WARN_ON(!rdev->scan_req->notified &&
1559 (!rdev->int_scan_req ||
1560 !rdev->int_scan_req->notified)))
1561 rdev->scan_req->info.aborted = true;
1562 ___cfg80211_scan_done(rdev, false);
1563 }
1564
1565 list_for_each_entry_safe(pos, tmp,
1566 &rdev->sched_scan_req_list, list) {
1567 if (WARN_ON(pos->dev == wdev->netdev))
1568 cfg80211_stop_sched_scan_req(rdev, pos, false);
1569 }
1570
1571 rdev->opencount--;
1572 wiphy_unlock(&rdev->wiphy);
1573 wake_up(&rdev->dev_wait);
1574 break;
1575 case NETDEV_UP:
1576 wiphy_lock(&rdev->wiphy);
1577 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1578 switch (wdev->iftype) {
1579 #ifdef CONFIG_CFG80211_WEXT
1580 case NL80211_IFTYPE_ADHOC:
1581 cfg80211_ibss_wext_join(rdev, wdev);
1582 break;
1583 case NL80211_IFTYPE_STATION:
1584 cfg80211_mgd_wext_connect(rdev, wdev);
1585 break;
1586 #endif
1587 #ifdef CONFIG_MAC80211_MESH
1588 case NL80211_IFTYPE_MESH_POINT:
1589 {
1590 /* backward compat code... */
1591 struct mesh_setup setup;
1592 memcpy(&setup, &default_mesh_setup,
1593 sizeof(setup));
1594 /* back compat only needed for mesh_id */
1595 setup.mesh_id = wdev->u.mesh.id;
1596 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1597 if (wdev->u.mesh.id_up_len)
1598 __cfg80211_join_mesh(rdev, dev,
1599 &setup,
1600 &default_mesh_config);
1601 break;
1602 }
1603 #endif
1604 default:
1605 break;
1606 }
1607 rdev->opencount++;
1608
1609 /*
1610 * Configure power management to the driver here so that its
1611 * correctly set also after interface type changes etc.
1612 */
1613 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1614 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1615 rdev->ops->set_power_mgmt &&
1616 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1617 wdev->ps_timeout)) {
1618 /* assume this means it's off */
1619 wdev->ps = false;
1620 }
1621 wiphy_unlock(&rdev->wiphy);
1622 break;
1623 case NETDEV_PRE_UP:
1624 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1625 wdev->use_4addr, 0))
1626 return notifier_from_errno(-EOPNOTSUPP);
1627
1628 if (rfkill_blocked(rdev->wiphy.rfkill))
1629 return notifier_from_errno(-ERFKILL);
1630 break;
1631 default:
1632 return NOTIFY_DONE;
1633 }
1634
1635 wireless_nlevent_flush();
1636
1637 return NOTIFY_OK;
1638 }
1639
1640 static struct notifier_block cfg80211_netdev_notifier = {
1641 .notifier_call = cfg80211_netdev_notifier_call,
1642 };
1643
cfg80211_pernet_exit(struct net * net)1644 static void __net_exit cfg80211_pernet_exit(struct net *net)
1645 {
1646 struct cfg80211_registered_device *rdev;
1647
1648 rtnl_lock();
1649 for_each_rdev(rdev) {
1650 if (net_eq(wiphy_net(&rdev->wiphy), net))
1651 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1652 }
1653 rtnl_unlock();
1654 }
1655
1656 static struct pernet_operations cfg80211_pernet_ops = {
1657 .exit = cfg80211_pernet_exit,
1658 };
1659
wiphy_work_queue(struct wiphy * wiphy,struct wiphy_work * work)1660 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1661 {
1662 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1663 unsigned long flags;
1664
1665 trace_wiphy_work_queue(wiphy, work);
1666
1667 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1668 if (list_empty(&work->entry))
1669 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1670 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1671
1672 queue_work(system_unbound_wq, &rdev->wiphy_work);
1673 }
1674 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1675
wiphy_work_cancel(struct wiphy * wiphy,struct wiphy_work * work)1676 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1677 {
1678 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1679 unsigned long flags;
1680
1681 lockdep_assert_held(&wiphy->mtx);
1682
1683 trace_wiphy_work_cancel(wiphy, work);
1684
1685 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1686 if (!list_empty(&work->entry))
1687 list_del_init(&work->entry);
1688 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1689 }
1690 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1691
wiphy_work_flush(struct wiphy * wiphy,struct wiphy_work * work)1692 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1693 {
1694 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1695 unsigned long flags;
1696 bool run;
1697
1698 trace_wiphy_work_flush(wiphy, work);
1699
1700 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1701 run = !work || !list_empty(&work->entry);
1702 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1703
1704 if (run)
1705 cfg80211_process_wiphy_works(rdev, work);
1706 }
1707 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1708
wiphy_delayed_work_timer(struct timer_list * t)1709 void wiphy_delayed_work_timer(struct timer_list *t)
1710 {
1711 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1712
1713 wiphy_work_queue(dwork->wiphy, &dwork->work);
1714 }
1715 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1716
wiphy_delayed_work_queue(struct wiphy * wiphy,struct wiphy_delayed_work * dwork,unsigned long delay)1717 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1718 struct wiphy_delayed_work *dwork,
1719 unsigned long delay)
1720 {
1721 trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay);
1722
1723 if (!delay) {
1724 del_timer(&dwork->timer);
1725 wiphy_work_queue(wiphy, &dwork->work);
1726 return;
1727 }
1728
1729 dwork->wiphy = wiphy;
1730 mod_timer(&dwork->timer, jiffies + delay);
1731 }
1732 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1733
wiphy_delayed_work_cancel(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1734 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1735 struct wiphy_delayed_work *dwork)
1736 {
1737 lockdep_assert_held(&wiphy->mtx);
1738
1739 del_timer_sync(&dwork->timer);
1740 wiphy_work_cancel(wiphy, &dwork->work);
1741 }
1742 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1743
wiphy_delayed_work_flush(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1744 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1745 struct wiphy_delayed_work *dwork)
1746 {
1747 lockdep_assert_held(&wiphy->mtx);
1748
1749 del_timer_sync(&dwork->timer);
1750 wiphy_work_flush(wiphy, &dwork->work);
1751 }
1752 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1753
wiphy_delayed_work_pending(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1754 bool wiphy_delayed_work_pending(struct wiphy *wiphy,
1755 struct wiphy_delayed_work *dwork)
1756 {
1757 return timer_pending(&dwork->timer);
1758 }
1759 EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending);
1760
cfg80211_init(void)1761 static int __init cfg80211_init(void)
1762 {
1763 int err;
1764
1765 err = register_pernet_device(&cfg80211_pernet_ops);
1766 if (err)
1767 goto out_fail_pernet;
1768
1769 err = wiphy_sysfs_init();
1770 if (err)
1771 goto out_fail_sysfs;
1772
1773 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1774 if (err)
1775 goto out_fail_notifier;
1776
1777 err = nl80211_init();
1778 if (err)
1779 goto out_fail_nl80211;
1780
1781 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1782
1783 err = regulatory_init();
1784 if (err)
1785 goto out_fail_reg;
1786
1787 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1788 if (!cfg80211_wq) {
1789 err = -ENOMEM;
1790 goto out_fail_wq;
1791 }
1792
1793 return 0;
1794
1795 out_fail_wq:
1796 regulatory_exit();
1797 out_fail_reg:
1798 debugfs_remove(ieee80211_debugfs_dir);
1799 nl80211_exit();
1800 out_fail_nl80211:
1801 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1802 out_fail_notifier:
1803 wiphy_sysfs_exit();
1804 out_fail_sysfs:
1805 unregister_pernet_device(&cfg80211_pernet_ops);
1806 out_fail_pernet:
1807 return err;
1808 }
1809 fs_initcall(cfg80211_init);
1810
cfg80211_exit(void)1811 static void __exit cfg80211_exit(void)
1812 {
1813 debugfs_remove(ieee80211_debugfs_dir);
1814 nl80211_exit();
1815 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1816 wiphy_sysfs_exit();
1817 regulatory_exit();
1818 unregister_pernet_device(&cfg80211_pernet_ops);
1819 destroy_workqueue(cfg80211_wq);
1820 }
1821 module_exit(cfg80211_exit);
1822