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) 2018-2026 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 /* maximum length of radio debugfs directory name */
38 #define RADIO_DEBUGFSDIR_MAX_LEN 8
39
40 MODULE_AUTHOR("Johannes Berg");
41 MODULE_LICENSE("GPL");
42 MODULE_DESCRIPTION("wireless configuration support");
43 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
44
45 /* RCU-protected (and RTNL for writers) */
46 LIST_HEAD(cfg80211_rdev_list);
47 int cfg80211_rdev_list_generation;
48
49 /* for debugfs */
50 static struct dentry *ieee80211_debugfs_dir;
51
52 /* for the cleanup, scan and event works */
53 struct workqueue_struct *cfg80211_wq;
54
55 static bool cfg80211_disable_40mhz_24ghz;
56 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
57 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
58 "Disable 40MHz support in the 2.4GHz band");
59
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)60 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
61 {
62 struct cfg80211_registered_device *result = NULL, *rdev;
63
64 ASSERT_RTNL();
65
66 for_each_rdev(rdev) {
67 if (rdev->wiphy_idx == wiphy_idx) {
68 result = rdev;
69 break;
70 }
71 }
72
73 return result;
74 }
75
get_wiphy_idx(struct wiphy * wiphy)76 int get_wiphy_idx(struct wiphy *wiphy)
77 {
78 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
79
80 return rdev->wiphy_idx;
81 }
82
wiphy_idx_to_wiphy(int wiphy_idx)83 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
84 {
85 struct cfg80211_registered_device *rdev;
86
87 ASSERT_RTNL();
88
89 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
90 if (!rdev)
91 return NULL;
92 return &rdev->wiphy;
93 }
94
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)95 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
96 const char *newname)
97 {
98 struct cfg80211_registered_device *rdev2;
99 int wiphy_idx, taken = -1, digits;
100
101 ASSERT_RTNL();
102
103 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
104 return -EINVAL;
105
106 /* prohibit calling the thing phy%d when %d is not its number */
107 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
108 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
109 /* count number of places needed to print wiphy_idx */
110 digits = 1;
111 while (wiphy_idx /= 10)
112 digits++;
113 /*
114 * deny the name if it is phy<idx> where <idx> is printed
115 * without leading zeroes. taken == strlen(newname) here
116 */
117 if (taken == strlen(PHY_NAME) + digits)
118 return -EINVAL;
119 }
120
121 /* Ensure another device does not already have this name. */
122 for_each_rdev(rdev2)
123 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
124 return -EINVAL;
125
126 return 0;
127 }
128
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)129 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
130 char *newname)
131 {
132 int result;
133
134 ASSERT_RTNL();
135 lockdep_assert_wiphy(&rdev->wiphy);
136
137 /* Ignore nop renames */
138 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
139 return 0;
140
141 result = cfg80211_dev_check_name(rdev, newname);
142 if (result < 0)
143 return result;
144
145 result = device_rename(&rdev->wiphy.dev, newname);
146 if (result)
147 return result;
148
149 debugfs_change_name(rdev->wiphy.debugfsdir, "%s", 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_immutable = false;
169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
170 if (err)
171 break;
172 wdev->netdev->netns_immutable = 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_immutable = false;
185 err = dev_change_net_namespace(wdev->netdev, net,
186 "wlan%d");
187 WARN_ON(err);
188 wdev->netdev->netns_immutable = true;
189 }
190
191 return err;
192 }
193
194 guard(wiphy)(&rdev->wiphy);
195
196 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
197 if (!wdev->netdev)
198 continue;
199 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
200 }
201
202 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
203
204 wiphy_net_set(&rdev->wiphy, net);
205
206 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
207 WARN_ON(err);
208
209 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
210
211 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
212 if (!wdev->netdev)
213 continue;
214 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
215 }
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 guard(wiphy)(&rdev->wiphy);
225
226 rdev_rfkill_poll(rdev);
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->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 struct cfg80211_nan_local_sched empty_sched = {};
258
259 lockdep_assert_held(&rdev->wiphy.mtx);
260
261 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
262 return;
263
264 if (!wdev_running(wdev))
265 return;
266
267 /*
268 * If there is a scheduled update pending, mark it as canceled, so the
269 * empty schedule will be accepted
270 */
271 wdev->u.nan.sched_update_pending = false;
272
273 /* Unschedule all */
274 cfg80211_nan_set_local_schedule(rdev, wdev, &empty_sched);
275
276 rdev_stop_nan(rdev, wdev);
277 wdev->is_running = false;
278
279 eth_zero_addr(wdev->u.nan.cluster_id);
280
281 rdev->opencount--;
282 }
283
cfg80211_nan_set_local_schedule(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_nan_local_sched * sched)284 int cfg80211_nan_set_local_schedule(struct cfg80211_registered_device *rdev,
285 struct wireless_dev *wdev,
286 struct cfg80211_nan_local_sched *sched)
287 {
288 int ret;
289
290 lockdep_assert_held(&rdev->wiphy.mtx);
291
292 if (wdev->iftype != NL80211_IFTYPE_NAN || !wdev_running(wdev))
293 return -EINVAL;
294
295 if (wdev->u.nan.sched_update_pending)
296 return -EBUSY;
297
298 ret = rdev_nan_set_local_sched(rdev, wdev, sched);
299 if (ret)
300 return ret;
301
302 wdev->u.nan.sched_update_pending = sched->deferred;
303
304 kfree(wdev->u.nan.chandefs);
305 wdev->u.nan.chandefs = NULL;
306 wdev->u.nan.n_channels = 0;
307
308 if (!sched->n_channels)
309 return 0;
310
311 wdev->u.nan.chandefs = kcalloc(sched->n_channels,
312 sizeof(*wdev->u.nan.chandefs),
313 GFP_KERNEL);
314 if (!wdev->u.nan.chandefs)
315 return -ENOMEM;
316
317 for (int i = 0; i < sched->n_channels; i++)
318 wdev->u.nan.chandefs[i] = sched->nan_channels[i].chandef;
319
320 wdev->u.nan.n_channels = sched->n_channels;
321
322 return 0;
323 }
324
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)325 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
326 {
327 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
328 struct wireless_dev *wdev;
329
330 ASSERT_RTNL();
331
332 /*
333 * Some netdev interfaces need to be closed before some non-netdev
334 * ones, i.e. NAN_DATA interfaces need to be closed before the NAN
335 * interface
336 */
337 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
338 if (wdev->netdev) {
339 dev_close(wdev->netdev);
340 continue;
341 }
342 }
343
344 guard(wiphy)(wiphy);
345
346 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
347 switch (wdev->iftype) {
348 case NL80211_IFTYPE_P2P_DEVICE:
349 cfg80211_stop_p2p_device(rdev, wdev);
350 break;
351 case NL80211_IFTYPE_NAN:
352 cfg80211_stop_nan(rdev, wdev);
353 break;
354 default:
355 break;
356 }
357 }
358 }
359 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
360
cfg80211_rfkill_set_block(void * data,bool blocked)361 static int cfg80211_rfkill_set_block(void *data, bool blocked)
362 {
363 struct cfg80211_registered_device *rdev = data;
364
365 if (!blocked)
366 return 0;
367
368 rtnl_lock();
369 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
370 rtnl_unlock();
371
372 return 0;
373 }
374
cfg80211_rfkill_block_work(struct work_struct * work)375 static void cfg80211_rfkill_block_work(struct work_struct *work)
376 {
377 struct cfg80211_registered_device *rdev;
378
379 rdev = container_of(work, struct cfg80211_registered_device,
380 rfkill_block);
381 cfg80211_rfkill_set_block(rdev, true);
382 }
383
cfg80211_event_work(struct work_struct * work)384 static void cfg80211_event_work(struct work_struct *work)
385 {
386 struct cfg80211_registered_device *rdev;
387
388 rdev = container_of(work, struct cfg80211_registered_device,
389 event_work);
390
391 guard(wiphy)(&rdev->wiphy);
392
393 cfg80211_process_rdev_events(rdev);
394 }
395
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)396 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
397 {
398 struct wireless_dev *wdev, *tmp;
399
400 ASSERT_RTNL();
401
402 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
403 if (wdev->nl_owner_dead) {
404 cfg80211_close_dependents(rdev, wdev);
405
406 if (wdev->netdev)
407 dev_close(wdev->netdev);
408
409 guard(wiphy)(&rdev->wiphy);
410
411 cfg80211_remove_virtual_intf(rdev, wdev);
412 }
413 }
414 }
415
cfg80211_close_dependents(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)416 void cfg80211_close_dependents(struct cfg80211_registered_device *rdev,
417 struct wireless_dev *wdev)
418 {
419 ASSERT_RTNL();
420
421 if (wdev->iftype != NL80211_IFTYPE_NAN)
422 return;
423
424 /* Close all NAN DATA interfaces */
425 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
426 if (wdev->iftype == NL80211_IFTYPE_NAN_DATA)
427 dev_close(wdev->netdev);
428 }
429 }
430
cfg80211_destroy_iface_wk(struct work_struct * work)431 static void cfg80211_destroy_iface_wk(struct work_struct *work)
432 {
433 struct cfg80211_registered_device *rdev;
434
435 rdev = container_of(work, struct cfg80211_registered_device,
436 destroy_work);
437
438 rtnl_lock();
439 cfg80211_destroy_ifaces(rdev);
440 rtnl_unlock();
441 }
442
cfg80211_sched_scan_stop_wk(struct wiphy * wiphy,struct wiphy_work * work)443 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
444 struct wiphy_work *work)
445 {
446 struct cfg80211_registered_device *rdev;
447 struct cfg80211_sched_scan_request *req, *tmp;
448
449 rdev = container_of(work, struct cfg80211_registered_device,
450 sched_scan_stop_wk);
451
452 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
453 if (req->nl_owner_dead)
454 cfg80211_stop_sched_scan_req(rdev, req, false);
455 }
456 }
457
cfg80211_propagate_radar_detect_wk(struct work_struct * work)458 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
459 {
460 struct cfg80211_registered_device *rdev;
461
462 rdev = container_of(work, struct cfg80211_registered_device,
463 propagate_radar_detect_wk);
464
465 rtnl_lock();
466
467 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
468 NL80211_DFS_UNAVAILABLE,
469 NL80211_RADAR_DETECTED);
470
471 rtnl_unlock();
472 }
473
cfg80211_propagate_cac_done_wk(struct work_struct * work)474 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
475 {
476 struct cfg80211_registered_device *rdev;
477
478 rdev = container_of(work, struct cfg80211_registered_device,
479 propagate_cac_done_wk);
480
481 rtnl_lock();
482
483 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
484 NL80211_DFS_AVAILABLE,
485 NL80211_RADAR_CAC_FINISHED);
486
487 rtnl_unlock();
488 }
489
cfg80211_wiphy_work(struct work_struct * work)490 static void cfg80211_wiphy_work(struct work_struct *work)
491 {
492 struct cfg80211_registered_device *rdev;
493 struct wiphy_work *wk;
494
495 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
496
497 trace_wiphy_work_worker_start(&rdev->wiphy);
498
499 guard(wiphy)(&rdev->wiphy);
500 if (rdev->suspended)
501 return;
502
503 spin_lock_irq(&rdev->wiphy_work_lock);
504 wk = list_first_entry_or_null(&rdev->wiphy_work_list,
505 struct wiphy_work, entry);
506 if (wk) {
507 list_del_init(&wk->entry);
508 if (!list_empty(&rdev->wiphy_work_list))
509 queue_work(system_dfl_wq, work);
510 spin_unlock_irq(&rdev->wiphy_work_lock);
511
512 trace_wiphy_work_run(&rdev->wiphy, wk);
513 wk->func(&rdev->wiphy, wk);
514 } else {
515 spin_unlock_irq(&rdev->wiphy_work_lock);
516 }
517 }
518
519 /* exported functions */
520
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)521 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
522 const char *requested_name)
523 {
524 static atomic_t wiphy_counter = ATOMIC_INIT(0);
525
526 struct cfg80211_registered_device *rdev;
527 int alloc_size;
528
529 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
530 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
531 WARN_ON(ops->connect && !ops->disconnect);
532 WARN_ON(ops->join_ibss && !ops->leave_ibss);
533 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
534 WARN_ON(ops->add_station && !ops->del_station);
535 WARN_ON(ops->add_mpath && !ops->del_mpath);
536 WARN_ON(ops->join_mesh && !ops->leave_mesh);
537 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
538 WARN_ON(ops->start_ap && !ops->stop_ap);
539 WARN_ON(ops->join_ocb && !ops->leave_ocb);
540 WARN_ON(ops->suspend && !ops->resume);
541 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
542 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
543 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
544 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
545
546 alloc_size = sizeof(*rdev) + sizeof_priv;
547
548 rdev = kzalloc(alloc_size, GFP_KERNEL);
549 if (!rdev)
550 return NULL;
551
552 rdev->ops = ops;
553
554 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
555
556 if (unlikely(rdev->wiphy_idx < 0)) {
557 /* ugh, wrapped! */
558 atomic_dec(&wiphy_counter);
559 kfree(rdev);
560 return NULL;
561 }
562
563 /* atomic_inc_return makes it start at 1, make it start at 0 */
564 rdev->wiphy_idx--;
565
566 /* give it a proper name */
567 if (requested_name && requested_name[0]) {
568 int rv;
569
570 rtnl_lock();
571 rv = cfg80211_dev_check_name(rdev, requested_name);
572
573 if (rv < 0) {
574 rtnl_unlock();
575 goto use_default_name;
576 }
577
578 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
579 rtnl_unlock();
580 if (rv)
581 goto use_default_name;
582 } else {
583 int rv;
584
585 use_default_name:
586 /* NOTE: This is *probably* safe w/out holding rtnl because of
587 * the restrictions on phy names. Probably this call could
588 * fail if some other part of the kernel (re)named a device
589 * phyX. But, might should add some locking and check return
590 * value, and use a different name if this one exists?
591 */
592 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
593 if (rv < 0) {
594 kfree(rdev);
595 return NULL;
596 }
597 }
598
599 mutex_init(&rdev->wiphy.mtx);
600 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
601 INIT_LIST_HEAD(&rdev->beacon_registrations);
602 spin_lock_init(&rdev->beacon_registrations_lock);
603 spin_lock_init(&rdev->bss_lock);
604 INIT_LIST_HEAD(&rdev->bss_list);
605 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
606 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
607 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
608 cfg80211_dfs_channels_update_work);
609 #ifdef CONFIG_CFG80211_WEXT
610 rdev->wiphy.wext = &cfg80211_wext_handler;
611 #endif
612
613 device_initialize(&rdev->wiphy.dev);
614 rdev->wiphy.dev.class = &ieee80211_class;
615 rdev->wiphy.dev.platform_data = rdev;
616 device_enable_async_suspend(&rdev->wiphy.dev);
617
618 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
619 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
620 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
621 INIT_WORK(&rdev->propagate_radar_detect_wk,
622 cfg80211_propagate_radar_detect_wk);
623 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
624 INIT_WORK(&rdev->mgmt_registrations_update_wk,
625 cfg80211_mgmt_registrations_update_wk);
626 spin_lock_init(&rdev->mgmt_registrations_lock);
627 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
628 INIT_LIST_HEAD(&rdev->wiphy_work_list);
629 spin_lock_init(&rdev->wiphy_work_lock);
630
631 #ifdef CONFIG_CFG80211_DEFAULT_PS
632 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
633 #endif
634
635 wiphy_net_set(&rdev->wiphy, &init_net);
636
637 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
638 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
639 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
640 &rdev->rfkill_ops, rdev);
641
642 if (!rdev->wiphy.rfkill) {
643 wiphy_free(&rdev->wiphy);
644 return NULL;
645 }
646
647 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
648 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
649 INIT_WORK(&rdev->event_work, cfg80211_event_work);
650 INIT_WORK(&rdev->background_cac_abort_wk,
651 cfg80211_background_cac_abort_wk);
652 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
653 cfg80211_background_cac_done_wk);
654
655 init_waitqueue_head(&rdev->dev_wait);
656
657 /*
658 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
659 * Fragmentation and RTS threshold are disabled by default with the
660 * special -1 value.
661 */
662 rdev->wiphy.retry_short = 7;
663 rdev->wiphy.retry_long = 4;
664 rdev->wiphy.frag_threshold = (u32) -1;
665 rdev->wiphy.rts_threshold = (u32) -1;
666 rdev->wiphy.coverage_class = 0;
667
668 rdev->wiphy.max_num_csa_counters = 1;
669
670 rdev->wiphy.max_sched_scan_plans = 1;
671 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
672
673 return &rdev->wiphy;
674 }
675 EXPORT_SYMBOL(wiphy_new_nm);
676
677 static
wiphy_verify_iface_combinations(struct wiphy * wiphy,const struct ieee80211_iface_combination * iface_comb,int n_iface_comb,bool combined_radio)678 int wiphy_verify_iface_combinations(struct wiphy *wiphy,
679 const struct ieee80211_iface_combination *iface_comb,
680 int n_iface_comb,
681 bool combined_radio)
682 {
683 const struct ieee80211_iface_combination *c;
684 int i, j;
685
686 for (i = 0; i < n_iface_comb; i++) {
687 u32 cnt = 0;
688 u16 all_iftypes = 0;
689
690 c = &iface_comb[i];
691
692 /*
693 * Combinations with just one interface aren't real,
694 * however we make an exception for DFS.
695 */
696 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
697 return -EINVAL;
698
699 /* Need at least one channel */
700 if (WARN_ON(!c->num_different_channels))
701 return -EINVAL;
702
703 /* DFS only works on one channel. Avoid this check
704 * for multi-radio global combination, since it hold
705 * the capabilities of all radio combinations.
706 */
707 if (!combined_radio &&
708 WARN_ON(c->radar_detect_widths &&
709 c->num_different_channels > 1))
710 return -EINVAL;
711
712 if (WARN_ON(!c->n_limits))
713 return -EINVAL;
714
715 for (j = 0; j < c->n_limits; j++) {
716 u16 types = c->limits[j].types;
717
718 /* interface types shouldn't overlap */
719 if (WARN_ON(types & all_iftypes))
720 return -EINVAL;
721 all_iftypes |= types;
722
723 if (WARN_ON(!c->limits[j].max))
724 return -EINVAL;
725
726 /* Shouldn't list software iftypes in combinations! */
727 if (WARN_ON(wiphy->software_iftypes & types))
728 return -EINVAL;
729
730 /* Only a single P2P_DEVICE can be allowed, avoid this
731 * check for multi-radio global combination, since it
732 * hold the capabilities of all radio combinations.
733 */
734 if (!combined_radio &&
735 WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
736 c->limits[j].max > 1))
737 return -EINVAL;
738
739 /* Only a single NAN can be allowed */
740 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
741 c->limits[j].max > 1))
742 return -EINVAL;
743
744 /*
745 * This isn't well-defined right now. If you have an
746 * IBSS interface, then its beacon interval may change
747 * by joining other networks, and nothing prevents it
748 * from doing that.
749 * So technically we probably shouldn't even allow AP
750 * and IBSS in the same interface, but it seems that
751 * some drivers support that, possibly only with fixed
752 * beacon intervals for IBSS.
753 */
754 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
755 c->beacon_int_min_gcd)) {
756 return -EINVAL;
757 }
758
759 cnt += c->limits[j].max;
760 /*
761 * Don't advertise an unsupported type
762 * in a combination.
763 */
764 if (WARN_ON((wiphy->interface_modes & types) != types))
765 return -EINVAL;
766 }
767
768 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
769 return -EINVAL;
770
771 /* You can't even choose that many! */
772 if (WARN_ON(cnt < c->max_interfaces))
773 return -EINVAL;
774 }
775
776 return 0;
777 }
778
wiphy_verify_combinations(struct wiphy * wiphy)779 static int wiphy_verify_combinations(struct wiphy *wiphy)
780 {
781 int i, ret;
782 bool combined_radio = false;
783
784 if (wiphy->n_radio) {
785 for (i = 0; i < wiphy->n_radio; i++) {
786 const struct wiphy_radio *radio = &wiphy->radio[i];
787
788 ret = wiphy_verify_iface_combinations(wiphy,
789 radio->iface_combinations,
790 radio->n_iface_combinations,
791 false);
792 if (ret)
793 return ret;
794 }
795
796 combined_radio = true;
797 }
798
799 ret = wiphy_verify_iface_combinations(wiphy,
800 wiphy->iface_combinations,
801 wiphy->n_iface_combinations,
802 combined_radio);
803
804 return ret;
805 }
806
wiphy_register(struct wiphy * wiphy)807 int wiphy_register(struct wiphy *wiphy)
808 {
809 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
810 int res;
811 enum nl80211_band band;
812 struct ieee80211_supported_band *sband;
813 bool have_band = false;
814 int i;
815 u16 ifmodes = wiphy->interface_modes;
816
817 #ifdef CONFIG_PM
818 if (WARN_ON(wiphy->wowlan &&
819 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
820 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
821 return -EINVAL;
822 if (WARN_ON(wiphy->wowlan &&
823 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
824 !wiphy->wowlan->tcp))
825 return -EINVAL;
826 #endif
827 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
828 (!rdev->ops->tdls_channel_switch ||
829 !rdev->ops->tdls_cancel_channel_switch)))
830 return -EINVAL;
831
832 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
833 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
834 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
835 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
836 return -EINVAL;
837
838 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN_DATA)) &&
839 !wiphy->nan_capa.phy.ht.ht_supported))
840 return -EINVAL;
841
842 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
843 return -EINVAL;
844
845 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
846 return -EINVAL;
847
848 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
849 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
850 !wiphy->pmsr_capa->ftm.non_asap))
851 return -EINVAL;
852 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
853 !wiphy->pmsr_capa->ftm.bandwidths))
854 return -EINVAL;
855 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
856 ~(BIT(NL80211_PREAMBLE_LEGACY) |
857 BIT(NL80211_PREAMBLE_HT) |
858 BIT(NL80211_PREAMBLE_VHT) |
859 BIT(NL80211_PREAMBLE_HE) |
860 BIT(NL80211_PREAMBLE_DMG))))
861 return -EINVAL;
862 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
863 wiphy->pmsr_capa->ftm.non_trigger_based) &&
864 !(wiphy->pmsr_capa->ftm.preambles &
865 BIT(NL80211_PREAMBLE_HE))))
866 return -EINVAL;
867 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
868 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
869 BIT(NL80211_CHAN_WIDTH_20) |
870 BIT(NL80211_CHAN_WIDTH_40) |
871 BIT(NL80211_CHAN_WIDTH_80) |
872 BIT(NL80211_CHAN_WIDTH_80P80) |
873 BIT(NL80211_CHAN_WIDTH_160) |
874 BIT(NL80211_CHAN_WIDTH_320) |
875 BIT(NL80211_CHAN_WIDTH_5) |
876 BIT(NL80211_CHAN_WIDTH_10))))
877 return -EINVAL;
878 }
879
880 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
881 (wiphy->regulatory_flags &
882 (REGULATORY_CUSTOM_REG |
883 REGULATORY_STRICT_REG |
884 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
885 REGULATORY_COUNTRY_IE_IGNORE))))
886 return -EINVAL;
887
888 if (WARN_ON(wiphy->coalesce &&
889 (!wiphy->coalesce->n_rules ||
890 !wiphy->coalesce->n_patterns) &&
891 (!wiphy->coalesce->pattern_min_len ||
892 wiphy->coalesce->pattern_min_len >
893 wiphy->coalesce->pattern_max_len)))
894 return -EINVAL;
895
896 if (WARN_ON(wiphy->ap_sme_capa &&
897 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
898 return -EINVAL;
899
900 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
901 return -EINVAL;
902
903 if (WARN_ON(wiphy->addresses &&
904 !is_zero_ether_addr(wiphy->perm_addr) &&
905 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
906 ETH_ALEN)))
907 return -EINVAL;
908
909 if (WARN_ON(wiphy->max_acl_mac_addrs &&
910 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
911 !rdev->ops->set_mac_acl)))
912 return -EINVAL;
913
914 /* assure only valid behaviours are flagged by driver
915 * hence subtract 2 as bit 0 is invalid.
916 */
917 if (WARN_ON(wiphy->bss_select_support &&
918 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
919 return -EINVAL;
920
921 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
922 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
923 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
924 return -EINVAL;
925
926 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
927 rdev->ops->update_connect_params))
928 return -EINVAL;
929
930 if (wiphy->addresses)
931 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
932
933 /* sanity check ifmodes */
934 WARN_ON(!ifmodes);
935 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
936 if (WARN_ON(ifmodes != wiphy->interface_modes))
937 wiphy->interface_modes = ifmodes;
938
939 res = wiphy_verify_combinations(wiphy);
940 if (res)
941 return res;
942
943 /* sanity check supported bands/channels */
944 for (band = 0; band < NUM_NL80211_BANDS; band++) {
945 const struct ieee80211_sband_iftype_data *iftd;
946 u16 types = 0;
947 bool have_he = false;
948
949 sband = wiphy->bands[band];
950 if (!sband)
951 continue;
952
953 sband->band = band;
954 if (WARN_ON(!sband->n_channels))
955 return -EINVAL;
956 /*
957 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
958 * n_bitrates is 0
959 */
960 if (WARN_ON((band != NL80211_BAND_60GHZ &&
961 band != NL80211_BAND_S1GHZ) &&
962 !sband->n_bitrates))
963 return -EINVAL;
964
965 if (WARN_ON(band == NL80211_BAND_6GHZ &&
966 (sband->ht_cap.ht_supported ||
967 sband->vht_cap.vht_supported)))
968 return -EINVAL;
969
970 /*
971 * Since cfg80211_disable_40mhz_24ghz is global, we can
972 * modify the sband's ht data even if the driver uses a
973 * global structure for that.
974 */
975 if (cfg80211_disable_40mhz_24ghz &&
976 band == NL80211_BAND_2GHZ &&
977 sband->ht_cap.ht_supported) {
978 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
979 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
980 }
981
982 /*
983 * Since we use a u32 for rate bitmaps in
984 * ieee80211_get_response_rate, we cannot
985 * have more than 32 legacy rates.
986 */
987 if (WARN_ON(sband->n_bitrates > 32))
988 return -EINVAL;
989
990 for (i = 0; i < sband->n_channels; i++) {
991 sband->channels[i].orig_flags =
992 sband->channels[i].flags;
993 sband->channels[i].orig_mag = INT_MAX;
994 sband->channels[i].orig_mpwr =
995 sband->channels[i].max_power;
996 sband->channels[i].band = band;
997
998 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
999 return -EINVAL;
1000 }
1001
1002 for_each_sband_iftype_data(sband, i, iftd) {
1003 bool has_ap, has_non_ap;
1004 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
1005 BIT(NL80211_IFTYPE_P2P_GO);
1006
1007 if (WARN_ON(!iftd->types_mask))
1008 return -EINVAL;
1009 if (WARN_ON(types & iftd->types_mask))
1010 return -EINVAL;
1011
1012 /* at least one piece of information must be present */
1013 if (WARN_ON(!iftd->he_cap.has_he))
1014 return -EINVAL;
1015
1016 types |= iftd->types_mask;
1017
1018 if (i == 0)
1019 have_he = iftd->he_cap.has_he;
1020 else
1021 have_he = have_he &&
1022 iftd->he_cap.has_he;
1023
1024 has_ap = iftd->types_mask & ap_bits;
1025 has_non_ap = iftd->types_mask & ~ap_bits;
1026
1027 /*
1028 * For EHT 20 MHz STA, the capabilities format differs
1029 * but to simplify, don't check 20 MHz but rather check
1030 * only if AP and non-AP were mentioned at the same time,
1031 * reject if so.
1032 */
1033 if (WARN_ON(iftd->eht_cap.has_eht &&
1034 has_ap && has_non_ap))
1035 return -EINVAL;
1036 }
1037
1038 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
1039 return -EINVAL;
1040
1041 have_band = true;
1042 }
1043
1044 if (!have_band) {
1045 WARN_ON(1);
1046 return -EINVAL;
1047 }
1048
1049 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
1050 /*
1051 * Validate we have a policy (can be explicitly set to
1052 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
1053 * we have at least one of doit/dumpit.
1054 */
1055 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
1056 return -EINVAL;
1057 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
1058 !rdev->wiphy.vendor_commands[i].dumpit))
1059 return -EINVAL;
1060 }
1061
1062 #ifdef CONFIG_PM
1063 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
1064 (!rdev->wiphy.wowlan->pattern_min_len ||
1065 rdev->wiphy.wowlan->pattern_min_len >
1066 rdev->wiphy.wowlan->pattern_max_len)))
1067 return -EINVAL;
1068 #endif
1069
1070 if (!wiphy->max_num_akm_suites)
1071 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
1072 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
1073 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
1074 return -EINVAL;
1075
1076 /* Allocate radio configuration space for multi-radio wiphy */
1077 if (wiphy->n_radio > 0) {
1078 int idx;
1079
1080 wiphy->radio_cfg = kzalloc_objs(*wiphy->radio_cfg,
1081 wiphy->n_radio);
1082 if (!wiphy->radio_cfg)
1083 return -ENOMEM;
1084 /*
1085 * Initialize wiphy radio parameters to IEEE 802.11
1086 * MIB default values. RTS threshold is disabled by
1087 * default with the special -1 value.
1088 */
1089 for (idx = 0; idx < wiphy->n_radio; idx++)
1090 wiphy->radio_cfg[idx].rts_threshold = (u32)-1;
1091 }
1092
1093 /* check and set up bitrates */
1094 ieee80211_set_bitrate_flags(wiphy);
1095
1096 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
1097
1098 if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_CTWINDOW)
1099 rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_CTWIN;
1100 else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_CTWIN)
1101 rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_CTWINDOW;
1102 if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_OPPPS)
1103 rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_OPPPS;
1104 else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_OPPPS)
1105 rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_OPPPS;
1106
1107 rtnl_lock();
1108 wiphy_lock(&rdev->wiphy);
1109 res = device_add(&rdev->wiphy.dev);
1110 if (res) {
1111 wiphy_unlock(&rdev->wiphy);
1112 rtnl_unlock();
1113 return res;
1114 }
1115
1116 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
1117 cfg80211_rdev_list_generation++;
1118
1119 /* add to debugfs */
1120 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
1121 ieee80211_debugfs_dir);
1122 if (wiphy->n_radio > 0) {
1123 int idx;
1124 char radio_name[RADIO_DEBUGFSDIR_MAX_LEN];
1125
1126 for (idx = 0; idx < wiphy->n_radio; idx++) {
1127 scnprintf(radio_name, sizeof(radio_name), "radio%d",
1128 idx);
1129 wiphy->radio_cfg[idx].radio_debugfsdir =
1130 debugfs_create_dir(radio_name,
1131 rdev->wiphy.debugfsdir);
1132 }
1133 }
1134
1135 cfg80211_debugfs_rdev_add(rdev);
1136 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
1137 wiphy_unlock(&rdev->wiphy);
1138
1139 /* set up regulatory info */
1140 wiphy_regulatory_register(wiphy);
1141
1142 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1143 struct regulatory_request request = {
1144 .wiphy_idx = get_wiphy_idx(wiphy),
1145 .initiator = NL80211_REGDOM_SET_BY_DRIVER,
1146 .alpha2[0] = '9',
1147 .alpha2[1] = '9',
1148 };
1149
1150 nl80211_send_reg_change_event(&request);
1151 }
1152
1153 /* Check that nobody globally advertises any capabilities they do not
1154 * advertise on all possible interface types.
1155 */
1156 if (wiphy->extended_capabilities_len &&
1157 wiphy->num_iftype_ext_capab &&
1158 wiphy->iftype_ext_capab) {
1159 u8 supported_on_all, j;
1160 const struct wiphy_iftype_ext_capab *capab;
1161
1162 capab = wiphy->iftype_ext_capab;
1163 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1164 if (capab[0].extended_capabilities_len > j)
1165 supported_on_all =
1166 capab[0].extended_capabilities[j];
1167 else
1168 supported_on_all = 0x00;
1169 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1170 if (j >= capab[i].extended_capabilities_len) {
1171 supported_on_all = 0x00;
1172 break;
1173 }
1174 supported_on_all &=
1175 capab[i].extended_capabilities[j];
1176 }
1177 if (WARN_ON(wiphy->extended_capabilities[j] &
1178 ~supported_on_all))
1179 break;
1180 }
1181 }
1182
1183 rdev->wiphy.registered = true;
1184 rtnl_unlock();
1185
1186 res = rfkill_register(rdev->wiphy.rfkill);
1187 if (res) {
1188 rfkill_destroy(rdev->wiphy.rfkill);
1189 rdev->wiphy.rfkill = NULL;
1190 wiphy_unregister(&rdev->wiphy);
1191 return res;
1192 }
1193
1194 return 0;
1195 }
1196 EXPORT_SYMBOL(wiphy_register);
1197
wiphy_rfkill_start_polling(struct wiphy * wiphy)1198 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1199 {
1200 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1201
1202 if (!rdev->ops->rfkill_poll)
1203 return;
1204 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1205 rfkill_resume_polling(wiphy->rfkill);
1206 }
1207 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1208
cfg80211_process_wiphy_works(struct cfg80211_registered_device * rdev,struct wiphy_work * end)1209 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1210 struct wiphy_work *end)
1211 {
1212 unsigned int runaway_limit = 100;
1213 unsigned long flags;
1214
1215 lockdep_assert_held(&rdev->wiphy.mtx);
1216
1217 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1218 while (!list_empty(&rdev->wiphy_work_list)) {
1219 struct wiphy_work *wk;
1220
1221 wk = list_first_entry(&rdev->wiphy_work_list,
1222 struct wiphy_work, entry);
1223 list_del_init(&wk->entry);
1224 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1225
1226 trace_wiphy_work_run(&rdev->wiphy, wk);
1227 wk->func(&rdev->wiphy, wk);
1228
1229 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1230
1231 if (wk == end)
1232 break;
1233
1234 if (WARN_ON(--runaway_limit == 0))
1235 INIT_LIST_HEAD(&rdev->wiphy_work_list);
1236 }
1237 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1238 }
1239
wiphy_unregister(struct wiphy * wiphy)1240 void wiphy_unregister(struct wiphy *wiphy)
1241 {
1242 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1243
1244 wait_event(rdev->dev_wait, ({
1245 int __count;
1246 wiphy_lock(&rdev->wiphy);
1247 __count = rdev->opencount;
1248 wiphy_unlock(&rdev->wiphy);
1249 __count == 0; }));
1250
1251 if (rdev->wiphy.rfkill)
1252 rfkill_unregister(rdev->wiphy.rfkill);
1253
1254 rtnl_lock();
1255 wiphy_lock(&rdev->wiphy);
1256 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1257 rdev->wiphy.registered = false;
1258
1259 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1260
1261 /*
1262 * First remove the hardware from everywhere, this makes
1263 * it impossible to find from userspace.
1264 */
1265 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1266 list_del_rcu(&rdev->list);
1267 synchronize_rcu();
1268
1269 /*
1270 * If this device got a regulatory hint tell core its
1271 * free to listen now to a new shiny device regulatory hint
1272 */
1273 wiphy_regulatory_deregister(wiphy);
1274
1275 cfg80211_rdev_list_generation++;
1276 device_del(&rdev->wiphy.dev);
1277
1278 #ifdef CONFIG_PM
1279 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1280 rdev_set_wakeup(rdev, false);
1281 #endif
1282
1283 /* surely nothing is reachable now, clean up work */
1284 cfg80211_process_wiphy_works(rdev, NULL);
1285 wiphy_unlock(&rdev->wiphy);
1286 rtnl_unlock();
1287
1288 /* this has nothing to do now but make sure it's gone */
1289 cancel_work_sync(&rdev->wiphy_work);
1290
1291 cancel_work_sync(&rdev->rfkill_block);
1292 cancel_work_sync(&rdev->conn_work);
1293 flush_work(&rdev->event_work);
1294 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1295 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1296 flush_work(&rdev->destroy_work);
1297 flush_work(&rdev->propagate_radar_detect_wk);
1298 flush_work(&rdev->propagate_cac_done_wk);
1299 flush_work(&rdev->mgmt_registrations_update_wk);
1300 flush_work(&rdev->background_cac_abort_wk);
1301
1302 cfg80211_rdev_free_wowlan(rdev);
1303 cfg80211_free_coalesce(rdev->coalesce);
1304 rdev->coalesce = NULL;
1305 }
1306 EXPORT_SYMBOL(wiphy_unregister);
1307
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1308 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1309 {
1310 struct cfg80211_internal_bss *scan, *tmp;
1311 struct cfg80211_beacon_registration *reg, *treg;
1312 unsigned long flags;
1313
1314 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1315 WARN_ON(!list_empty(&rdev->wiphy_work_list));
1316 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1317 cancel_work_sync(&rdev->wiphy_work);
1318
1319 rfkill_destroy(rdev->wiphy.rfkill);
1320 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1321 list_del(®->list);
1322 kfree(reg);
1323 }
1324 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1325 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1326 mutex_destroy(&rdev->wiphy.mtx);
1327
1328 /*
1329 * The 'regd' can only be non-NULL if we never finished
1330 * initializing the wiphy and thus never went through the
1331 * unregister path - e.g. in failure scenarios. Thus, it
1332 * cannot have been visible to anyone if non-NULL, so we
1333 * can just free it here.
1334 */
1335 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1336
1337 kfree(rdev);
1338 }
1339
wiphy_free(struct wiphy * wiphy)1340 void wiphy_free(struct wiphy *wiphy)
1341 {
1342 kfree(wiphy->radio_cfg);
1343 put_device(&wiphy->dev);
1344 }
1345 EXPORT_SYMBOL(wiphy_free);
1346
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1347 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1348 enum rfkill_hard_block_reasons reason)
1349 {
1350 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1351
1352 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1353 schedule_work(&rdev->rfkill_block);
1354 }
1355 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1356
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1357 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1358 bool unregister_netdev)
1359 {
1360 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1361 struct cfg80211_cqm_config *cqm_config;
1362 unsigned int link_id;
1363
1364 ASSERT_RTNL();
1365 lockdep_assert_held(&rdev->wiphy.mtx);
1366
1367 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1368
1369 wdev->registered = false;
1370
1371 if (wdev->netdev) {
1372 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1373 if (unregister_netdev)
1374 unregister_netdevice(wdev->netdev);
1375 }
1376
1377 list_del_rcu(&wdev->list);
1378 synchronize_net();
1379 rdev->devlist_generation++;
1380
1381 cfg80211_mlme_purge_registrations(wdev);
1382
1383 switch (wdev->iftype) {
1384 case NL80211_IFTYPE_P2P_DEVICE:
1385 cfg80211_stop_p2p_device(rdev, wdev);
1386 break;
1387 case NL80211_IFTYPE_NAN:
1388 cfg80211_stop_nan(rdev, wdev);
1389 break;
1390 default:
1391 break;
1392 }
1393
1394 #ifdef CONFIG_CFG80211_WEXT
1395 kfree_sensitive(wdev->wext.keys);
1396 wdev->wext.keys = NULL;
1397 #endif
1398 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1399 /* deleted from the list, so can't be found from nl80211 any more */
1400 cqm_config = rcu_access_pointer(wdev->cqm_config);
1401 kfree_rcu(cqm_config, rcu_head);
1402 RCU_INIT_POINTER(wdev->cqm_config, NULL);
1403
1404 /*
1405 * Ensure that all events have been processed and
1406 * freed.
1407 */
1408 cfg80211_process_wdev_events(wdev);
1409
1410 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1411 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1412 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1413 struct cfg80211_internal_bss *curbss;
1414
1415 curbss = wdev->links[link_id].client.current_bss;
1416
1417 if (WARN_ON(curbss)) {
1418 cfg80211_unhold_bss(curbss);
1419 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1420 wdev->links[link_id].client.current_bss = NULL;
1421 }
1422 }
1423 }
1424
1425 wdev->connected = false;
1426 }
1427
cfg80211_unregister_wdev(struct wireless_dev * wdev)1428 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1429 {
1430 _cfg80211_unregister_wdev(wdev, true);
1431 }
1432 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1433
1434 static const struct device_type wiphy_type = {
1435 .name = "wlan",
1436 };
1437
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1438 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1439 enum nl80211_iftype iftype, int num)
1440 {
1441 lockdep_assert_held(&rdev->wiphy.mtx);
1442
1443 rdev->num_running_ifaces += num;
1444 if (iftype == NL80211_IFTYPE_MONITOR)
1445 rdev->num_running_monitor_ifaces += num;
1446 }
1447
cfg80211_leave_locked(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,int link_id)1448 void cfg80211_leave_locked(struct cfg80211_registered_device *rdev,
1449 struct wireless_dev *wdev, int link_id)
1450 {
1451 struct net_device *dev = wdev->netdev;
1452 struct cfg80211_sched_scan_request *pos, *tmp;
1453
1454 lockdep_assert_held(&rdev->wiphy.mtx);
1455
1456 cfg80211_pmsr_wdev_down(wdev);
1457
1458 cfg80211_stop_radar_detection(wdev);
1459 cfg80211_stop_background_radar_detection(wdev);
1460
1461 switch (wdev->iftype) {
1462 case NL80211_IFTYPE_ADHOC:
1463 cfg80211_leave_ibss(rdev, dev, true);
1464 break;
1465 case NL80211_IFTYPE_P2P_CLIENT:
1466 case NL80211_IFTYPE_STATION:
1467 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1468 list) {
1469 if (dev == pos->dev)
1470 cfg80211_stop_sched_scan_req(rdev, pos, false);
1471 }
1472
1473 #ifdef CONFIG_CFG80211_WEXT
1474 kfree(wdev->wext.ie);
1475 wdev->wext.ie = NULL;
1476 wdev->wext.ie_len = 0;
1477 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1478 #endif
1479 cfg80211_disconnect(rdev, dev,
1480 WLAN_REASON_DEAUTH_LEAVING, true);
1481 break;
1482 case NL80211_IFTYPE_MESH_POINT:
1483 cfg80211_leave_mesh(rdev, dev);
1484 break;
1485 case NL80211_IFTYPE_AP:
1486 case NL80211_IFTYPE_P2P_GO:
1487 cfg80211_stop_ap(rdev, dev, link_id, true);
1488 break;
1489 case NL80211_IFTYPE_OCB:
1490 cfg80211_leave_ocb(rdev, dev);
1491 break;
1492 case NL80211_IFTYPE_P2P_DEVICE:
1493 cfg80211_stop_p2p_device(rdev, wdev);
1494 break;
1495 case NL80211_IFTYPE_NAN:
1496 cfg80211_stop_nan(rdev, wdev);
1497 break;
1498 case NL80211_IFTYPE_AP_VLAN:
1499 case NL80211_IFTYPE_MONITOR:
1500 case NL80211_IFTYPE_NAN_DATA:
1501 /* nothing to do */
1502 break;
1503 case NL80211_IFTYPE_UNSPECIFIED:
1504 case NL80211_IFTYPE_WDS:
1505 case NUM_NL80211_IFTYPES:
1506 /* invalid */
1507 break;
1508 }
1509 }
1510
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,int link_id)1511 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1512 struct wireless_dev *wdev, int link_id)
1513 {
1514 ASSERT_RTNL();
1515
1516 /* NAN_DATA interfaces must be closed before stopping NAN */
1517 cfg80211_close_dependents(rdev, wdev);
1518
1519 guard(wiphy)(&rdev->wiphy);
1520
1521 cfg80211_leave_locked(rdev, wdev, link_id);
1522 }
1523
cfg80211_stop_link(struct wiphy * wiphy,struct wireless_dev * wdev,int link_id,gfp_t gfp)1524 void cfg80211_stop_link(struct wiphy *wiphy, struct wireless_dev *wdev,
1525 int link_id, gfp_t gfp)
1526 {
1527 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1528 struct cfg80211_event *ev;
1529 unsigned long flags;
1530
1531 /* Only AP/GO interfaces may have a specific link_id */
1532 if (WARN_ON_ONCE(link_id != -1 &&
1533 wdev->iftype != NL80211_IFTYPE_AP &&
1534 wdev->iftype != NL80211_IFTYPE_P2P_GO))
1535 link_id = -1;
1536
1537 trace_cfg80211_stop_link(wiphy, wdev, link_id);
1538
1539 if (wdev->iftype == NL80211_IFTYPE_NAN)
1540 return;
1541
1542 ev = kzalloc_obj(*ev, gfp);
1543 if (!ev)
1544 return;
1545
1546 ev->type = EVENT_STOPPED;
1547 ev->link_id = link_id;
1548
1549 spin_lock_irqsave(&wdev->event_lock, flags);
1550 list_add_tail(&ev->list, &wdev->event_list);
1551 spin_unlock_irqrestore(&wdev->event_lock, flags);
1552 queue_work(cfg80211_wq, &rdev->event_work);
1553 }
1554 EXPORT_SYMBOL(cfg80211_stop_link);
1555
cfg80211_init_wdev(struct wireless_dev * wdev)1556 void cfg80211_init_wdev(struct wireless_dev *wdev)
1557 {
1558 INIT_LIST_HEAD(&wdev->event_list);
1559 spin_lock_init(&wdev->event_lock);
1560 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1561 INIT_LIST_HEAD(&wdev->pmsr_list);
1562 spin_lock_init(&wdev->pmsr_lock);
1563 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1564
1565 #ifdef CONFIG_CFG80211_WEXT
1566 wdev->wext.default_key = -1;
1567 wdev->wext.default_mgmt_key = -1;
1568 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1569 #endif
1570
1571 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1572
1573 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1574 wdev->ps = true;
1575 else
1576 wdev->ps = false;
1577 /* allow mac80211 to determine the timeout */
1578 wdev->ps_timeout = -1;
1579
1580 wdev->radio_mask = BIT(wdev->wiphy->n_radio) - 1;
1581
1582 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1583 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1584 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1585 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1586
1587 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1588 }
1589
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1590 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1591 struct wireless_dev *wdev)
1592 {
1593 ASSERT_RTNL();
1594 lockdep_assert_held(&rdev->wiphy.mtx);
1595
1596 /*
1597 * We get here also when the interface changes network namespaces,
1598 * as it's registered into the new one, but we don't want it to
1599 * change ID in that case. Checking if the ID is already assigned
1600 * works, because 0 isn't considered a valid ID and the memory is
1601 * 0-initialized.
1602 */
1603 if (!wdev->identifier)
1604 wdev->identifier = ++rdev->wdev_id;
1605 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1606 rdev->devlist_generation++;
1607 wdev->registered = true;
1608
1609 if (wdev->netdev &&
1610 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1611 "phy80211"))
1612 pr_err("failed to add phy80211 symlink to netdev!\n");
1613
1614 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1615 }
1616
cfg80211_register_netdevice(struct net_device * dev)1617 int cfg80211_register_netdevice(struct net_device *dev)
1618 {
1619 struct wireless_dev *wdev = dev->ieee80211_ptr;
1620 struct cfg80211_registered_device *rdev;
1621 int ret;
1622
1623 ASSERT_RTNL();
1624
1625 if (WARN_ON(!wdev))
1626 return -EINVAL;
1627
1628 rdev = wiphy_to_rdev(wdev->wiphy);
1629
1630 lockdep_assert_held(&rdev->wiphy.mtx);
1631
1632 /* we'll take care of this */
1633 wdev->registered = true;
1634 wdev->registering = true;
1635 ret = register_netdevice(dev);
1636 if (ret)
1637 goto out;
1638
1639 cfg80211_register_wdev(rdev, wdev);
1640 ret = 0;
1641 out:
1642 wdev->registering = false;
1643 if (ret)
1644 wdev->registered = false;
1645 return ret;
1646 }
1647 EXPORT_SYMBOL(cfg80211_register_netdevice);
1648
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1649 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1650 unsigned long state, void *ptr)
1651 {
1652 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1653 struct wireless_dev *wdev = dev->ieee80211_ptr;
1654 struct cfg80211_registered_device *rdev;
1655 struct cfg80211_sched_scan_request *pos, *tmp;
1656
1657 if (!wdev)
1658 return NOTIFY_DONE;
1659
1660 rdev = wiphy_to_rdev(wdev->wiphy);
1661
1662 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1663
1664 switch (state) {
1665 case NETDEV_POST_INIT:
1666 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1667 wdev->netdev = dev;
1668 /* can only change netns with wiphy */
1669 dev->netns_immutable = true;
1670
1671 cfg80211_init_wdev(wdev);
1672 break;
1673 case NETDEV_REGISTER:
1674 if (!wdev->registered) {
1675 guard(wiphy)(&rdev->wiphy);
1676
1677 cfg80211_register_wdev(rdev, wdev);
1678 }
1679 break;
1680 case NETDEV_UNREGISTER:
1681 /*
1682 * It is possible to get NETDEV_UNREGISTER multiple times,
1683 * so check wdev->registered.
1684 */
1685 if (wdev->registered && !wdev->registering) {
1686 guard(wiphy)(&rdev->wiphy);
1687
1688 _cfg80211_unregister_wdev(wdev, false);
1689 }
1690 break;
1691 case NETDEV_GOING_DOWN:
1692 cfg80211_leave(rdev, wdev, -1);
1693 scoped_guard(wiphy, &rdev->wiphy)
1694 cfg80211_remove_links(wdev);
1695 /* since we just did cfg80211_leave() nothing to do there */
1696 cancel_work_sync(&wdev->disconnect_wk);
1697 cancel_work_sync(&wdev->pmsr_free_wk);
1698 break;
1699 case NETDEV_DOWN:
1700 wiphy_lock(&rdev->wiphy);
1701 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1702 if (rdev->scan_req && rdev->scan_req->req.wdev == wdev) {
1703 if (WARN_ON(!rdev->scan_req->notified &&
1704 (!rdev->int_scan_req ||
1705 !rdev->int_scan_req->notified)))
1706 rdev->scan_req->info.aborted = true;
1707 ___cfg80211_scan_done(rdev, false);
1708 }
1709
1710 list_for_each_entry_safe(pos, tmp,
1711 &rdev->sched_scan_req_list, list) {
1712 if (WARN_ON(pos->dev == wdev->netdev))
1713 cfg80211_stop_sched_scan_req(rdev, pos, false);
1714 }
1715
1716 rdev->opencount--;
1717 wiphy_unlock(&rdev->wiphy);
1718 wake_up(&rdev->dev_wait);
1719 break;
1720 case NETDEV_UP:
1721 wiphy_lock(&rdev->wiphy);
1722 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1723 switch (wdev->iftype) {
1724 #ifdef CONFIG_CFG80211_WEXT
1725 case NL80211_IFTYPE_ADHOC:
1726 cfg80211_ibss_wext_join(rdev, wdev);
1727 break;
1728 case NL80211_IFTYPE_STATION:
1729 cfg80211_mgd_wext_connect(rdev, wdev);
1730 break;
1731 #endif
1732 #ifdef CONFIG_MAC80211_MESH
1733 case NL80211_IFTYPE_MESH_POINT:
1734 {
1735 /* backward compat code... */
1736 struct mesh_setup setup;
1737 memcpy(&setup, &default_mesh_setup,
1738 sizeof(setup));
1739 /* back compat only needed for mesh_id */
1740 setup.mesh_id = wdev->u.mesh.id;
1741 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1742 if (wdev->u.mesh.id_up_len)
1743 __cfg80211_join_mesh(rdev, dev,
1744 &setup,
1745 &default_mesh_config);
1746 break;
1747 }
1748 #endif
1749 default:
1750 break;
1751 }
1752 rdev->opencount++;
1753
1754 /*
1755 * Configure power management to the driver here so that its
1756 * correctly set also after interface type changes etc.
1757 */
1758 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1759 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1760 rdev->ops->set_power_mgmt &&
1761 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1762 wdev->ps_timeout)) {
1763 /* assume this means it's off */
1764 wdev->ps = false;
1765 }
1766 wiphy_unlock(&rdev->wiphy);
1767 break;
1768 case NETDEV_PRE_UP:
1769 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1770 wdev->use_4addr, 0))
1771 return notifier_from_errno(-EOPNOTSUPP);
1772
1773 if (rfkill_blocked(rdev->wiphy.rfkill))
1774 return notifier_from_errno(-ERFKILL);
1775
1776 /* NAN_DATA interfaces require a running NAN interface */
1777 if (wdev->iftype == NL80211_IFTYPE_NAN_DATA) {
1778 struct wireless_dev *iter;
1779 bool nan_started = false;
1780
1781 list_for_each_entry(iter, &rdev->wiphy.wdev_list, list) {
1782 if (iter->iftype == NL80211_IFTYPE_NAN &&
1783 wdev_running(iter)) {
1784 nan_started = true;
1785 break;
1786 }
1787 }
1788
1789 if (!nan_started)
1790 return notifier_from_errno(-ENOLINK);
1791 }
1792 break;
1793 default:
1794 return NOTIFY_DONE;
1795 }
1796
1797 wireless_nlevent_flush();
1798
1799 return NOTIFY_OK;
1800 }
1801
1802 static struct notifier_block cfg80211_netdev_notifier = {
1803 .notifier_call = cfg80211_netdev_notifier_call,
1804 };
1805
cfg80211_pernet_exit(struct net * net)1806 static void __net_exit cfg80211_pernet_exit(struct net *net)
1807 {
1808 struct cfg80211_registered_device *rdev;
1809
1810 rtnl_lock();
1811 for_each_rdev(rdev) {
1812 if (net_eq(wiphy_net(&rdev->wiphy), net))
1813 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1814 }
1815 rtnl_unlock();
1816 }
1817
1818 static struct pernet_operations cfg80211_pernet_ops = {
1819 .exit = cfg80211_pernet_exit,
1820 };
1821
wiphy_work_queue(struct wiphy * wiphy,struct wiphy_work * work)1822 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1823 {
1824 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1825 unsigned long flags;
1826
1827 trace_wiphy_work_queue(wiphy, work);
1828
1829 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1830 if (list_empty(&work->entry))
1831 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1832 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1833
1834 queue_work(system_dfl_wq, &rdev->wiphy_work);
1835 }
1836 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1837
wiphy_work_cancel(struct wiphy * wiphy,struct wiphy_work * work)1838 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1839 {
1840 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1841 unsigned long flags;
1842
1843 lockdep_assert_held(&wiphy->mtx);
1844
1845 trace_wiphy_work_cancel(wiphy, work);
1846
1847 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1848 if (!list_empty(&work->entry))
1849 list_del_init(&work->entry);
1850 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1851 }
1852 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1853
wiphy_work_flush(struct wiphy * wiphy,struct wiphy_work * work)1854 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1855 {
1856 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1857 unsigned long flags;
1858 bool run;
1859
1860 trace_wiphy_work_flush(wiphy, work);
1861
1862 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1863 run = !work || !list_empty(&work->entry);
1864 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1865
1866 if (run)
1867 cfg80211_process_wiphy_works(rdev, work);
1868 }
1869 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1870
wiphy_delayed_work_timer(struct timer_list * t)1871 void wiphy_delayed_work_timer(struct timer_list *t)
1872 {
1873 struct wiphy_delayed_work *dwork = timer_container_of(dwork, t, timer);
1874
1875 wiphy_work_queue(dwork->wiphy, &dwork->work);
1876 }
1877 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1878
wiphy_delayed_work_queue(struct wiphy * wiphy,struct wiphy_delayed_work * dwork,unsigned long delay)1879 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1880 struct wiphy_delayed_work *dwork,
1881 unsigned long delay)
1882 {
1883 trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay);
1884
1885 if (!delay) {
1886 timer_delete(&dwork->timer);
1887 wiphy_work_queue(wiphy, &dwork->work);
1888 return;
1889 }
1890
1891 dwork->wiphy = wiphy;
1892 mod_timer(&dwork->timer, jiffies + delay);
1893 }
1894 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1895
wiphy_delayed_work_cancel(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1896 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1897 struct wiphy_delayed_work *dwork)
1898 {
1899 lockdep_assert_held(&wiphy->mtx);
1900
1901 timer_delete_sync(&dwork->timer);
1902 wiphy_work_cancel(wiphy, &dwork->work);
1903 }
1904 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1905
wiphy_delayed_work_flush(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1906 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1907 struct wiphy_delayed_work *dwork)
1908 {
1909 lockdep_assert_held(&wiphy->mtx);
1910
1911 timer_delete_sync(&dwork->timer);
1912 wiphy_work_flush(wiphy, &dwork->work);
1913 }
1914 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1915
wiphy_delayed_work_pending(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1916 bool wiphy_delayed_work_pending(struct wiphy *wiphy,
1917 struct wiphy_delayed_work *dwork)
1918 {
1919 return timer_pending(&dwork->timer);
1920 }
1921 EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending);
1922
wiphy_hrtimer_work_timer(struct hrtimer * t)1923 enum hrtimer_restart wiphy_hrtimer_work_timer(struct hrtimer *t)
1924 {
1925 struct wiphy_hrtimer_work *hrwork =
1926 container_of(t, struct wiphy_hrtimer_work, timer);
1927
1928 wiphy_work_queue(hrwork->wiphy, &hrwork->work);
1929
1930 return HRTIMER_NORESTART;
1931 }
1932 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_timer);
1933
wiphy_hrtimer_work_queue(struct wiphy * wiphy,struct wiphy_hrtimer_work * hrwork,ktime_t delay)1934 void wiphy_hrtimer_work_queue(struct wiphy *wiphy,
1935 struct wiphy_hrtimer_work *hrwork,
1936 ktime_t delay)
1937 {
1938 trace_wiphy_hrtimer_work_queue(wiphy, &hrwork->work, delay);
1939
1940 if (!delay) {
1941 hrtimer_cancel(&hrwork->timer);
1942 wiphy_work_queue(wiphy, &hrwork->work);
1943 return;
1944 }
1945
1946 hrwork->wiphy = wiphy;
1947 hrtimer_start_range_ns(&hrwork->timer, delay,
1948 1000 * NSEC_PER_USEC, HRTIMER_MODE_REL);
1949 }
1950 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_queue);
1951
wiphy_hrtimer_work_cancel(struct wiphy * wiphy,struct wiphy_hrtimer_work * hrwork)1952 void wiphy_hrtimer_work_cancel(struct wiphy *wiphy,
1953 struct wiphy_hrtimer_work *hrwork)
1954 {
1955 lockdep_assert_held(&wiphy->mtx);
1956
1957 hrtimer_cancel(&hrwork->timer);
1958 wiphy_work_cancel(wiphy, &hrwork->work);
1959 }
1960 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_cancel);
1961
wiphy_hrtimer_work_flush(struct wiphy * wiphy,struct wiphy_hrtimer_work * hrwork)1962 void wiphy_hrtimer_work_flush(struct wiphy *wiphy,
1963 struct wiphy_hrtimer_work *hrwork)
1964 {
1965 lockdep_assert_held(&wiphy->mtx);
1966
1967 hrtimer_cancel(&hrwork->timer);
1968 wiphy_work_flush(wiphy, &hrwork->work);
1969 }
1970 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_flush);
1971
wiphy_hrtimer_work_pending(struct wiphy * wiphy,struct wiphy_hrtimer_work * hrwork)1972 bool wiphy_hrtimer_work_pending(struct wiphy *wiphy,
1973 struct wiphy_hrtimer_work *hrwork)
1974 {
1975 return hrtimer_is_queued(&hrwork->timer);
1976 }
1977 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_pending);
1978
cfg80211_init(void)1979 static int __init cfg80211_init(void)
1980 {
1981 int err;
1982
1983 err = register_pernet_device(&cfg80211_pernet_ops);
1984 if (err)
1985 goto out_fail_pernet;
1986
1987 err = wiphy_sysfs_init();
1988 if (err)
1989 goto out_fail_sysfs;
1990
1991 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1992 if (err)
1993 goto out_fail_notifier;
1994
1995 err = nl80211_init();
1996 if (err)
1997 goto out_fail_nl80211;
1998
1999 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
2000
2001 err = regulatory_init();
2002 if (err)
2003 goto out_fail_reg;
2004
2005 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
2006 if (!cfg80211_wq) {
2007 err = -ENOMEM;
2008 goto out_fail_wq;
2009 }
2010
2011 return 0;
2012
2013 out_fail_wq:
2014 regulatory_exit();
2015 out_fail_reg:
2016 debugfs_remove(ieee80211_debugfs_dir);
2017 nl80211_exit();
2018 out_fail_nl80211:
2019 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
2020 out_fail_notifier:
2021 wiphy_sysfs_exit();
2022 out_fail_sysfs:
2023 unregister_pernet_device(&cfg80211_pernet_ops);
2024 out_fail_pernet:
2025 return err;
2026 }
2027 fs_initcall(cfg80211_init);
2028
cfg80211_exit(void)2029 static void __exit cfg80211_exit(void)
2030 {
2031 debugfs_remove(ieee80211_debugfs_dir);
2032 nl80211_exit();
2033 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
2034 wiphy_sysfs_exit();
2035 regulatory_exit();
2036 unregister_pernet_device(&cfg80211_pernet_ops);
2037 destroy_workqueue(cfg80211_wq);
2038 }
2039 module_exit(cfg80211_exit);
2040