i40e: Fix unexpected MFS warning message
[platform/kernel/linux-starfive.git] / net / wireless / core.c
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) 2018-2022 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
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         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
64                 if (rdev->wiphy_idx == wiphy_idx) {
65                         result = rdev;
66                         break;
67                 }
68         }
69
70         return result;
71 }
72
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
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
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         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
121                         return -EINVAL;
122
123         return 0;
124 }
125
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
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->features &= ~NETIF_F_NETNS_LOCAL;
169                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
170                 if (err)
171                         break;
172                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
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->features &= ~NETIF_F_NETNS_LOCAL;
185                         err = dev_change_net_namespace(wdev->netdev, net,
186                                                         "wlan%d");
187                         WARN_ON(err);
188                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
189                 }
190
191                 return err;
192         }
193
194         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
195                 if (!wdev->netdev)
196                         continue;
197                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
198         }
199
200         wiphy_lock(&rdev->wiphy);
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         wiphy_unlock(&rdev->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
220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
221 {
222         struct cfg80211_registered_device *rdev = data;
223
224         rdev_rfkill_poll(rdev);
225 }
226
227 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
228                               struct wireless_dev *wdev)
229 {
230         lockdep_assert_held(&rdev->wiphy.mtx);
231
232         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
233                 return;
234
235         if (!wdev_running(wdev))
236                 return;
237
238         rdev_stop_p2p_device(rdev, wdev);
239         wdev->is_running = false;
240
241         rdev->opencount--;
242
243         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
244                 if (WARN_ON(!rdev->scan_req->notified &&
245                             (!rdev->int_scan_req ||
246                              !rdev->int_scan_req->notified)))
247                         rdev->scan_req->info.aborted = true;
248                 ___cfg80211_scan_done(rdev, false);
249         }
250 }
251
252 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
253                        struct wireless_dev *wdev)
254 {
255         lockdep_assert_held(&rdev->wiphy.mtx);
256
257         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
258                 return;
259
260         if (!wdev_running(wdev))
261                 return;
262
263         rdev_stop_nan(rdev, wdev);
264         wdev->is_running = false;
265
266         rdev->opencount--;
267 }
268
269 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
270 {
271         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
272         struct wireless_dev *wdev;
273
274         ASSERT_RTNL();
275
276         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
277                 if (wdev->netdev) {
278                         dev_close(wdev->netdev);
279                         continue;
280                 }
281
282                 /* otherwise, check iftype */
283
284                 wiphy_lock(wiphy);
285
286                 switch (wdev->iftype) {
287                 case NL80211_IFTYPE_P2P_DEVICE:
288                         cfg80211_stop_p2p_device(rdev, wdev);
289                         break;
290                 case NL80211_IFTYPE_NAN:
291                         cfg80211_stop_nan(rdev, wdev);
292                         break;
293                 default:
294                         break;
295                 }
296
297                 wiphy_unlock(wiphy);
298         }
299 }
300 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
301
302 static int cfg80211_rfkill_set_block(void *data, bool blocked)
303 {
304         struct cfg80211_registered_device *rdev = data;
305
306         if (!blocked)
307                 return 0;
308
309         rtnl_lock();
310         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
311         rtnl_unlock();
312
313         return 0;
314 }
315
316 static void cfg80211_rfkill_block_work(struct work_struct *work)
317 {
318         struct cfg80211_registered_device *rdev;
319
320         rdev = container_of(work, struct cfg80211_registered_device,
321                             rfkill_block);
322         cfg80211_rfkill_set_block(rdev, true);
323 }
324
325 static void cfg80211_event_work(struct work_struct *work)
326 {
327         struct cfg80211_registered_device *rdev;
328
329         rdev = container_of(work, struct cfg80211_registered_device,
330                             event_work);
331
332         wiphy_lock(&rdev->wiphy);
333         cfg80211_process_rdev_events(rdev);
334         wiphy_unlock(&rdev->wiphy);
335 }
336
337 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
338 {
339         struct wireless_dev *wdev, *tmp;
340
341         ASSERT_RTNL();
342
343         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
344                 if (wdev->nl_owner_dead) {
345                         if (wdev->netdev)
346                                 dev_close(wdev->netdev);
347
348                         wiphy_lock(&rdev->wiphy);
349                         cfg80211_leave(rdev, wdev);
350                         cfg80211_remove_virtual_intf(rdev, wdev);
351                         wiphy_unlock(&rdev->wiphy);
352                 }
353         }
354 }
355
356 static void cfg80211_destroy_iface_wk(struct work_struct *work)
357 {
358         struct cfg80211_registered_device *rdev;
359
360         rdev = container_of(work, struct cfg80211_registered_device,
361                             destroy_work);
362
363         rtnl_lock();
364         cfg80211_destroy_ifaces(rdev);
365         rtnl_unlock();
366 }
367
368 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
369                                         struct wiphy_work *work)
370 {
371         struct cfg80211_registered_device *rdev;
372         struct cfg80211_sched_scan_request *req, *tmp;
373
374         rdev = container_of(work, struct cfg80211_registered_device,
375                            sched_scan_stop_wk);
376
377         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
378                 if (req->nl_owner_dead)
379                         cfg80211_stop_sched_scan_req(rdev, req, false);
380         }
381 }
382
383 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
384 {
385         struct cfg80211_registered_device *rdev;
386
387         rdev = container_of(work, struct cfg80211_registered_device,
388                             propagate_radar_detect_wk);
389
390         rtnl_lock();
391
392         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
393                                        NL80211_DFS_UNAVAILABLE,
394                                        NL80211_RADAR_DETECTED);
395
396         rtnl_unlock();
397 }
398
399 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
400 {
401         struct cfg80211_registered_device *rdev;
402
403         rdev = container_of(work, struct cfg80211_registered_device,
404                             propagate_cac_done_wk);
405
406         rtnl_lock();
407
408         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
409                                        NL80211_DFS_AVAILABLE,
410                                        NL80211_RADAR_CAC_FINISHED);
411
412         rtnl_unlock();
413 }
414
415 static void cfg80211_wiphy_work(struct work_struct *work)
416 {
417         struct cfg80211_registered_device *rdev;
418         struct wiphy_work *wk;
419
420         rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
421
422         wiphy_lock(&rdev->wiphy);
423         if (rdev->suspended)
424                 goto out;
425
426         spin_lock_irq(&rdev->wiphy_work_lock);
427         wk = list_first_entry_or_null(&rdev->wiphy_work_list,
428                                       struct wiphy_work, entry);
429         if (wk) {
430                 list_del_init(&wk->entry);
431                 if (!list_empty(&rdev->wiphy_work_list))
432                         schedule_work(work);
433                 spin_unlock_irq(&rdev->wiphy_work_lock);
434
435                 wk->func(&rdev->wiphy, wk);
436         } else {
437                 spin_unlock_irq(&rdev->wiphy_work_lock);
438         }
439 out:
440         wiphy_unlock(&rdev->wiphy);
441 }
442
443 /* exported functions */
444
445 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
446                            const char *requested_name)
447 {
448         static atomic_t wiphy_counter = ATOMIC_INIT(0);
449
450         struct cfg80211_registered_device *rdev;
451         int alloc_size;
452
453         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
454         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
455         WARN_ON(ops->connect && !ops->disconnect);
456         WARN_ON(ops->join_ibss && !ops->leave_ibss);
457         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
458         WARN_ON(ops->add_station && !ops->del_station);
459         WARN_ON(ops->add_mpath && !ops->del_mpath);
460         WARN_ON(ops->join_mesh && !ops->leave_mesh);
461         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
462         WARN_ON(ops->start_ap && !ops->stop_ap);
463         WARN_ON(ops->join_ocb && !ops->leave_ocb);
464         WARN_ON(ops->suspend && !ops->resume);
465         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
466         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
467         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
468         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
469
470         alloc_size = sizeof(*rdev) + sizeof_priv;
471
472         rdev = kzalloc(alloc_size, GFP_KERNEL);
473         if (!rdev)
474                 return NULL;
475
476         rdev->ops = ops;
477
478         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
479
480         if (unlikely(rdev->wiphy_idx < 0)) {
481                 /* ugh, wrapped! */
482                 atomic_dec(&wiphy_counter);
483                 kfree(rdev);
484                 return NULL;
485         }
486
487         /* atomic_inc_return makes it start at 1, make it start at 0 */
488         rdev->wiphy_idx--;
489
490         /* give it a proper name */
491         if (requested_name && requested_name[0]) {
492                 int rv;
493
494                 rtnl_lock();
495                 rv = cfg80211_dev_check_name(rdev, requested_name);
496
497                 if (rv < 0) {
498                         rtnl_unlock();
499                         goto use_default_name;
500                 }
501
502                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
503                 rtnl_unlock();
504                 if (rv)
505                         goto use_default_name;
506         } else {
507                 int rv;
508
509 use_default_name:
510                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
511                  * the restrictions on phy names.  Probably this call could
512                  * fail if some other part of the kernel (re)named a device
513                  * phyX.  But, might should add some locking and check return
514                  * value, and use a different name if this one exists?
515                  */
516                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
517                 if (rv < 0) {
518                         kfree(rdev);
519                         return NULL;
520                 }
521         }
522
523         mutex_init(&rdev->wiphy.mtx);
524         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
525         INIT_LIST_HEAD(&rdev->beacon_registrations);
526         spin_lock_init(&rdev->beacon_registrations_lock);
527         spin_lock_init(&rdev->bss_lock);
528         INIT_LIST_HEAD(&rdev->bss_list);
529         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
530         wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
531         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
532                           cfg80211_dfs_channels_update_work);
533 #ifdef CONFIG_CFG80211_WEXT
534         rdev->wiphy.wext = &cfg80211_wext_handler;
535 #endif
536
537         device_initialize(&rdev->wiphy.dev);
538         rdev->wiphy.dev.class = &ieee80211_class;
539         rdev->wiphy.dev.platform_data = rdev;
540         device_enable_async_suspend(&rdev->wiphy.dev);
541
542         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
543         wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
544         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
545         INIT_WORK(&rdev->propagate_radar_detect_wk,
546                   cfg80211_propagate_radar_detect_wk);
547         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
548         INIT_WORK(&rdev->mgmt_registrations_update_wk,
549                   cfg80211_mgmt_registrations_update_wk);
550         spin_lock_init(&rdev->mgmt_registrations_lock);
551
552 #ifdef CONFIG_CFG80211_DEFAULT_PS
553         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
554 #endif
555
556         wiphy_net_set(&rdev->wiphy, &init_net);
557
558         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
559         rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
560                                           &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
561                                           &rdev->rfkill_ops, rdev);
562
563         if (!rdev->wiphy.rfkill) {
564                 wiphy_free(&rdev->wiphy);
565                 return NULL;
566         }
567
568         INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
569         INIT_LIST_HEAD(&rdev->wiphy_work_list);
570         spin_lock_init(&rdev->wiphy_work_lock);
571         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
572         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
573         INIT_WORK(&rdev->event_work, cfg80211_event_work);
574         INIT_WORK(&rdev->background_cac_abort_wk,
575                   cfg80211_background_cac_abort_wk);
576         INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
577                           cfg80211_background_cac_done_wk);
578
579         init_waitqueue_head(&rdev->dev_wait);
580
581         /*
582          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
583          * Fragmentation and RTS threshold are disabled by default with the
584          * special -1 value.
585          */
586         rdev->wiphy.retry_short = 7;
587         rdev->wiphy.retry_long = 4;
588         rdev->wiphy.frag_threshold = (u32) -1;
589         rdev->wiphy.rts_threshold = (u32) -1;
590         rdev->wiphy.coverage_class = 0;
591
592         rdev->wiphy.max_num_csa_counters = 1;
593
594         rdev->wiphy.max_sched_scan_plans = 1;
595         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
596
597         return &rdev->wiphy;
598 }
599 EXPORT_SYMBOL(wiphy_new_nm);
600
601 static int wiphy_verify_combinations(struct wiphy *wiphy)
602 {
603         const struct ieee80211_iface_combination *c;
604         int i, j;
605
606         for (i = 0; i < wiphy->n_iface_combinations; i++) {
607                 u32 cnt = 0;
608                 u16 all_iftypes = 0;
609
610                 c = &wiphy->iface_combinations[i];
611
612                 /*
613                  * Combinations with just one interface aren't real,
614                  * however we make an exception for DFS.
615                  */
616                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
617                         return -EINVAL;
618
619                 /* Need at least one channel */
620                 if (WARN_ON(!c->num_different_channels))
621                         return -EINVAL;
622
623                 /* DFS only works on one channel. */
624                 if (WARN_ON(c->radar_detect_widths &&
625                             (c->num_different_channels > 1)))
626                         return -EINVAL;
627
628                 if (WARN_ON(!c->n_limits))
629                         return -EINVAL;
630
631                 for (j = 0; j < c->n_limits; j++) {
632                         u16 types = c->limits[j].types;
633
634                         /* interface types shouldn't overlap */
635                         if (WARN_ON(types & all_iftypes))
636                                 return -EINVAL;
637                         all_iftypes |= types;
638
639                         if (WARN_ON(!c->limits[j].max))
640                                 return -EINVAL;
641
642                         /* Shouldn't list software iftypes in combinations! */
643                         if (WARN_ON(wiphy->software_iftypes & types))
644                                 return -EINVAL;
645
646                         /* Only a single P2P_DEVICE can be allowed */
647                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
648                                     c->limits[j].max > 1))
649                                 return -EINVAL;
650
651                         /* Only a single NAN can be allowed */
652                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
653                                     c->limits[j].max > 1))
654                                 return -EINVAL;
655
656                         /*
657                          * This isn't well-defined right now. If you have an
658                          * IBSS interface, then its beacon interval may change
659                          * by joining other networks, and nothing prevents it
660                          * from doing that.
661                          * So technically we probably shouldn't even allow AP
662                          * and IBSS in the same interface, but it seems that
663                          * some drivers support that, possibly only with fixed
664                          * beacon intervals for IBSS.
665                          */
666                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
667                                     c->beacon_int_min_gcd)) {
668                                 return -EINVAL;
669                         }
670
671                         cnt += c->limits[j].max;
672                         /*
673                          * Don't advertise an unsupported type
674                          * in a combination.
675                          */
676                         if (WARN_ON((wiphy->interface_modes & types) != types))
677                                 return -EINVAL;
678                 }
679
680                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
681                         return -EINVAL;
682
683                 /* You can't even choose that many! */
684                 if (WARN_ON(cnt < c->max_interfaces))
685                         return -EINVAL;
686         }
687
688         return 0;
689 }
690
691 int wiphy_register(struct wiphy *wiphy)
692 {
693         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
694         int res;
695         enum nl80211_band band;
696         struct ieee80211_supported_band *sband;
697         bool have_band = false;
698         int i;
699         u16 ifmodes = wiphy->interface_modes;
700
701 #ifdef CONFIG_PM
702         if (WARN_ON(wiphy->wowlan &&
703                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
704                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
705                 return -EINVAL;
706         if (WARN_ON(wiphy->wowlan &&
707                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
708                     !wiphy->wowlan->tcp))
709                 return -EINVAL;
710 #endif
711         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
712                     (!rdev->ops->tdls_channel_switch ||
713                      !rdev->ops->tdls_cancel_channel_switch)))
714                 return -EINVAL;
715
716         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
717                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
718                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
719                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
720                 return -EINVAL;
721
722         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
723                 return -EINVAL;
724
725         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
726                 return -EINVAL;
727
728         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
729                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
730                             !wiphy->pmsr_capa->ftm.non_asap))
731                         return -EINVAL;
732                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
733                             !wiphy->pmsr_capa->ftm.bandwidths))
734                         return -EINVAL;
735                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
736                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
737                                   BIT(NL80211_PREAMBLE_HT) |
738                                   BIT(NL80211_PREAMBLE_VHT) |
739                                   BIT(NL80211_PREAMBLE_HE) |
740                                   BIT(NL80211_PREAMBLE_DMG))))
741                         return -EINVAL;
742                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
743                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
744                             !(wiphy->pmsr_capa->ftm.preambles &
745                               BIT(NL80211_PREAMBLE_HE))))
746                         return -EINVAL;
747                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
748                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
749                                   BIT(NL80211_CHAN_WIDTH_20) |
750                                   BIT(NL80211_CHAN_WIDTH_40) |
751                                   BIT(NL80211_CHAN_WIDTH_80) |
752                                   BIT(NL80211_CHAN_WIDTH_80P80) |
753                                   BIT(NL80211_CHAN_WIDTH_160) |
754                                   BIT(NL80211_CHAN_WIDTH_5) |
755                                   BIT(NL80211_CHAN_WIDTH_10))))
756                         return -EINVAL;
757         }
758
759         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
760                     (wiphy->regulatory_flags &
761                                         (REGULATORY_CUSTOM_REG |
762                                          REGULATORY_STRICT_REG |
763                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
764                                          REGULATORY_COUNTRY_IE_IGNORE))))
765                 return -EINVAL;
766
767         if (WARN_ON(wiphy->coalesce &&
768                     (!wiphy->coalesce->n_rules ||
769                      !wiphy->coalesce->n_patterns) &&
770                     (!wiphy->coalesce->pattern_min_len ||
771                      wiphy->coalesce->pattern_min_len >
772                         wiphy->coalesce->pattern_max_len)))
773                 return -EINVAL;
774
775         if (WARN_ON(wiphy->ap_sme_capa &&
776                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
777                 return -EINVAL;
778
779         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
780                 return -EINVAL;
781
782         if (WARN_ON(wiphy->addresses &&
783                     !is_zero_ether_addr(wiphy->perm_addr) &&
784                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
785                            ETH_ALEN)))
786                 return -EINVAL;
787
788         if (WARN_ON(wiphy->max_acl_mac_addrs &&
789                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
790                      !rdev->ops->set_mac_acl)))
791                 return -EINVAL;
792
793         /* assure only valid behaviours are flagged by driver
794          * hence subtract 2 as bit 0 is invalid.
795          */
796         if (WARN_ON(wiphy->bss_select_support &&
797                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
798                 return -EINVAL;
799
800         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
801                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
802                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
803                 return -EINVAL;
804
805         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
806                     rdev->ops->update_connect_params))
807                 return -EINVAL;
808
809         if (wiphy->addresses)
810                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
811
812         /* sanity check ifmodes */
813         WARN_ON(!ifmodes);
814         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
815         if (WARN_ON(ifmodes != wiphy->interface_modes))
816                 wiphy->interface_modes = ifmodes;
817
818         res = wiphy_verify_combinations(wiphy);
819         if (res)
820                 return res;
821
822         /* sanity check supported bands/channels */
823         for (band = 0; band < NUM_NL80211_BANDS; band++) {
824                 u16 types = 0;
825                 bool have_he = false;
826
827                 sband = wiphy->bands[band];
828                 if (!sband)
829                         continue;
830
831                 sband->band = band;
832                 if (WARN_ON(!sband->n_channels))
833                         return -EINVAL;
834                 /*
835                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
836                  * n_bitrates is 0
837                  */
838                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
839                              band != NL80211_BAND_S1GHZ) &&
840                             !sband->n_bitrates))
841                         return -EINVAL;
842
843                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
844                             (sband->ht_cap.ht_supported ||
845                              sband->vht_cap.vht_supported)))
846                         return -EINVAL;
847
848                 /*
849                  * Since cfg80211_disable_40mhz_24ghz is global, we can
850                  * modify the sband's ht data even if the driver uses a
851                  * global structure for that.
852                  */
853                 if (cfg80211_disable_40mhz_24ghz &&
854                     band == NL80211_BAND_2GHZ &&
855                     sband->ht_cap.ht_supported) {
856                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
857                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
858                 }
859
860                 /*
861                  * Since we use a u32 for rate bitmaps in
862                  * ieee80211_get_response_rate, we cannot
863                  * have more than 32 legacy rates.
864                  */
865                 if (WARN_ON(sband->n_bitrates > 32))
866                         return -EINVAL;
867
868                 for (i = 0; i < sband->n_channels; i++) {
869                         sband->channels[i].orig_flags =
870                                 sband->channels[i].flags;
871                         sband->channels[i].orig_mag = INT_MAX;
872                         sband->channels[i].orig_mpwr =
873                                 sband->channels[i].max_power;
874                         sband->channels[i].band = band;
875
876                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
877                                 return -EINVAL;
878                 }
879
880                 for (i = 0; i < sband->n_iftype_data; i++) {
881                         const struct ieee80211_sband_iftype_data *iftd;
882                         bool has_ap, has_non_ap;
883                         u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
884                                       BIT(NL80211_IFTYPE_P2P_GO);
885
886                         iftd = &sband->iftype_data[i];
887
888                         if (WARN_ON(!iftd->types_mask))
889                                 return -EINVAL;
890                         if (WARN_ON(types & iftd->types_mask))
891                                 return -EINVAL;
892
893                         /* at least one piece of information must be present */
894                         if (WARN_ON(!iftd->he_cap.has_he))
895                                 return -EINVAL;
896
897                         types |= iftd->types_mask;
898
899                         if (i == 0)
900                                 have_he = iftd->he_cap.has_he;
901                         else
902                                 have_he = have_he &&
903                                           iftd->he_cap.has_he;
904
905                         has_ap = iftd->types_mask & ap_bits;
906                         has_non_ap = iftd->types_mask & ~ap_bits;
907
908                         /*
909                          * For EHT 20 MHz STA, the capabilities format differs
910                          * but to simplify, don't check 20 MHz but rather check
911                          * only if AP and non-AP were mentioned at the same time,
912                          * reject if so.
913                          */
914                         if (WARN_ON(iftd->eht_cap.has_eht &&
915                                     has_ap && has_non_ap))
916                                 return -EINVAL;
917                 }
918
919                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
920                         return -EINVAL;
921
922                 have_band = true;
923         }
924
925         if (!have_band) {
926                 WARN_ON(1);
927                 return -EINVAL;
928         }
929
930         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
931                 /*
932                  * Validate we have a policy (can be explicitly set to
933                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
934                  * we have at least one of doit/dumpit.
935                  */
936                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
937                         return -EINVAL;
938                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
939                             !rdev->wiphy.vendor_commands[i].dumpit))
940                         return -EINVAL;
941         }
942
943 #ifdef CONFIG_PM
944         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
945                     (!rdev->wiphy.wowlan->pattern_min_len ||
946                      rdev->wiphy.wowlan->pattern_min_len >
947                                 rdev->wiphy.wowlan->pattern_max_len)))
948                 return -EINVAL;
949 #endif
950
951         if (!wiphy->max_num_akm_suites)
952                 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
953         else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
954                  wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
955                 return -EINVAL;
956
957         /* check and set up bitrates */
958         ieee80211_set_bitrate_flags(wiphy);
959
960         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
961
962         rtnl_lock();
963         wiphy_lock(&rdev->wiphy);
964         res = device_add(&rdev->wiphy.dev);
965         if (res) {
966                 wiphy_unlock(&rdev->wiphy);
967                 rtnl_unlock();
968                 return res;
969         }
970
971         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
972         cfg80211_rdev_list_generation++;
973
974         /* add to debugfs */
975         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
976                                                     ieee80211_debugfs_dir);
977
978         cfg80211_debugfs_rdev_add(rdev);
979         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
980         wiphy_unlock(&rdev->wiphy);
981
982         /* set up regulatory info */
983         wiphy_regulatory_register(wiphy);
984
985         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
986                 struct regulatory_request request;
987
988                 request.wiphy_idx = get_wiphy_idx(wiphy);
989                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
990                 request.alpha2[0] = '9';
991                 request.alpha2[1] = '9';
992
993                 nl80211_send_reg_change_event(&request);
994         }
995
996         /* Check that nobody globally advertises any capabilities they do not
997          * advertise on all possible interface types.
998          */
999         if (wiphy->extended_capabilities_len &&
1000             wiphy->num_iftype_ext_capab &&
1001             wiphy->iftype_ext_capab) {
1002                 u8 supported_on_all, j;
1003                 const struct wiphy_iftype_ext_capab *capab;
1004
1005                 capab = wiphy->iftype_ext_capab;
1006                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1007                         if (capab[0].extended_capabilities_len > j)
1008                                 supported_on_all =
1009                                         capab[0].extended_capabilities[j];
1010                         else
1011                                 supported_on_all = 0x00;
1012                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1013                                 if (j >= capab[i].extended_capabilities_len) {
1014                                         supported_on_all = 0x00;
1015                                         break;
1016                                 }
1017                                 supported_on_all &=
1018                                         capab[i].extended_capabilities[j];
1019                         }
1020                         if (WARN_ON(wiphy->extended_capabilities[j] &
1021                                     ~supported_on_all))
1022                                 break;
1023                 }
1024         }
1025
1026         rdev->wiphy.registered = true;
1027         rtnl_unlock();
1028
1029         res = rfkill_register(rdev->wiphy.rfkill);
1030         if (res) {
1031                 rfkill_destroy(rdev->wiphy.rfkill);
1032                 rdev->wiphy.rfkill = NULL;
1033                 wiphy_unregister(&rdev->wiphy);
1034                 return res;
1035         }
1036
1037         return 0;
1038 }
1039 EXPORT_SYMBOL(wiphy_register);
1040
1041 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1042 {
1043         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1044
1045         if (!rdev->ops->rfkill_poll)
1046                 return;
1047         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1048         rfkill_resume_polling(wiphy->rfkill);
1049 }
1050 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1051
1052 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1053                                   struct wiphy_work *end)
1054 {
1055         unsigned int runaway_limit = 100;
1056         unsigned long flags;
1057
1058         lockdep_assert_held(&rdev->wiphy.mtx);
1059
1060         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1061         while (!list_empty(&rdev->wiphy_work_list)) {
1062                 struct wiphy_work *wk;
1063
1064                 wk = list_first_entry(&rdev->wiphy_work_list,
1065                                       struct wiphy_work, entry);
1066                 list_del_init(&wk->entry);
1067                 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1068
1069                 wk->func(&rdev->wiphy, wk);
1070
1071                 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1072
1073                 if (wk == end)
1074                         break;
1075
1076                 if (WARN_ON(--runaway_limit == 0))
1077                         INIT_LIST_HEAD(&rdev->wiphy_work_list);
1078         }
1079         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1080 }
1081
1082 void wiphy_unregister(struct wiphy *wiphy)
1083 {
1084         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1085
1086         wait_event(rdev->dev_wait, ({
1087                 int __count;
1088                 wiphy_lock(&rdev->wiphy);
1089                 __count = rdev->opencount;
1090                 wiphy_unlock(&rdev->wiphy);
1091                 __count == 0; }));
1092
1093         if (rdev->wiphy.rfkill)
1094                 rfkill_unregister(rdev->wiphy.rfkill);
1095
1096         rtnl_lock();
1097         wiphy_lock(&rdev->wiphy);
1098         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1099         rdev->wiphy.registered = false;
1100
1101         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1102
1103         /*
1104          * First remove the hardware from everywhere, this makes
1105          * it impossible to find from userspace.
1106          */
1107         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1108         list_del_rcu(&rdev->list);
1109         synchronize_rcu();
1110
1111         /*
1112          * If this device got a regulatory hint tell core its
1113          * free to listen now to a new shiny device regulatory hint
1114          */
1115         wiphy_regulatory_deregister(wiphy);
1116
1117         cfg80211_rdev_list_generation++;
1118         device_del(&rdev->wiphy.dev);
1119
1120 #ifdef CONFIG_PM
1121         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1122                 rdev_set_wakeup(rdev, false);
1123 #endif
1124
1125         /* surely nothing is reachable now, clean up work */
1126         cfg80211_process_wiphy_works(rdev, NULL);
1127         wiphy_unlock(&rdev->wiphy);
1128         rtnl_unlock();
1129
1130         /* this has nothing to do now but make sure it's gone */
1131         cancel_work_sync(&rdev->wiphy_work);
1132
1133         cancel_work_sync(&rdev->conn_work);
1134         flush_work(&rdev->event_work);
1135         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1136         cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1137         flush_work(&rdev->destroy_work);
1138         flush_work(&rdev->propagate_radar_detect_wk);
1139         flush_work(&rdev->propagate_cac_done_wk);
1140         flush_work(&rdev->mgmt_registrations_update_wk);
1141         flush_work(&rdev->background_cac_abort_wk);
1142
1143         cfg80211_rdev_free_wowlan(rdev);
1144         cfg80211_rdev_free_coalesce(rdev);
1145 }
1146 EXPORT_SYMBOL(wiphy_unregister);
1147
1148 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1149 {
1150         struct cfg80211_internal_bss *scan, *tmp;
1151         struct cfg80211_beacon_registration *reg, *treg;
1152         rfkill_destroy(rdev->wiphy.rfkill);
1153         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1154                 list_del(&reg->list);
1155                 kfree(reg);
1156         }
1157         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1158                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1159         mutex_destroy(&rdev->wiphy.mtx);
1160
1161         /*
1162          * The 'regd' can only be non-NULL if we never finished
1163          * initializing the wiphy and thus never went through the
1164          * unregister path - e.g. in failure scenarios. Thus, it
1165          * cannot have been visible to anyone if non-NULL, so we
1166          * can just free it here.
1167          */
1168         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1169
1170         kfree(rdev);
1171 }
1172
1173 void wiphy_free(struct wiphy *wiphy)
1174 {
1175         put_device(&wiphy->dev);
1176 }
1177 EXPORT_SYMBOL(wiphy_free);
1178
1179 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1180                                       enum rfkill_hard_block_reasons reason)
1181 {
1182         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1183
1184         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1185                 schedule_work(&rdev->rfkill_block);
1186 }
1187 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1188
1189 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1190                                       bool unregister_netdev)
1191 {
1192         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1193         struct cfg80211_cqm_config *cqm_config;
1194         unsigned int link_id;
1195
1196         ASSERT_RTNL();
1197         lockdep_assert_held(&rdev->wiphy.mtx);
1198
1199         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1200
1201         wdev->registered = false;
1202
1203         if (wdev->netdev) {
1204                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1205                 if (unregister_netdev)
1206                         unregister_netdevice(wdev->netdev);
1207         }
1208
1209         list_del_rcu(&wdev->list);
1210         synchronize_net();
1211         rdev->devlist_generation++;
1212
1213         cfg80211_mlme_purge_registrations(wdev);
1214
1215         switch (wdev->iftype) {
1216         case NL80211_IFTYPE_P2P_DEVICE:
1217                 cfg80211_stop_p2p_device(rdev, wdev);
1218                 break;
1219         case NL80211_IFTYPE_NAN:
1220                 cfg80211_stop_nan(rdev, wdev);
1221                 break;
1222         default:
1223                 break;
1224         }
1225
1226 #ifdef CONFIG_CFG80211_WEXT
1227         kfree_sensitive(wdev->wext.keys);
1228         wdev->wext.keys = NULL;
1229 #endif
1230         wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1231         /* deleted from the list, so can't be found from nl80211 any more */
1232         cqm_config = rcu_access_pointer(wdev->cqm_config);
1233         kfree_rcu(cqm_config, rcu_head);
1234
1235         /*
1236          * Ensure that all events have been processed and
1237          * freed.
1238          */
1239         cfg80211_process_wdev_events(wdev);
1240
1241         if (wdev->iftype == NL80211_IFTYPE_STATION ||
1242             wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1243                 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1244                         struct cfg80211_internal_bss *curbss;
1245
1246                         curbss = wdev->links[link_id].client.current_bss;
1247
1248                         if (WARN_ON(curbss)) {
1249                                 cfg80211_unhold_bss(curbss);
1250                                 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1251                                 wdev->links[link_id].client.current_bss = NULL;
1252                         }
1253                 }
1254         }
1255
1256         wdev->connected = false;
1257 }
1258
1259 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1260 {
1261         _cfg80211_unregister_wdev(wdev, true);
1262 }
1263 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1264
1265 static const struct device_type wiphy_type = {
1266         .name   = "wlan",
1267 };
1268
1269 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1270                                enum nl80211_iftype iftype, int num)
1271 {
1272         lockdep_assert_held(&rdev->wiphy.mtx);
1273
1274         rdev->num_running_ifaces += num;
1275         if (iftype == NL80211_IFTYPE_MONITOR)
1276                 rdev->num_running_monitor_ifaces += num;
1277 }
1278
1279 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1280                       struct wireless_dev *wdev)
1281 {
1282         struct net_device *dev = wdev->netdev;
1283         struct cfg80211_sched_scan_request *pos, *tmp;
1284
1285         lockdep_assert_held(&rdev->wiphy.mtx);
1286         ASSERT_WDEV_LOCK(wdev);
1287
1288         cfg80211_pmsr_wdev_down(wdev);
1289
1290         cfg80211_stop_background_radar_detection(wdev);
1291
1292         switch (wdev->iftype) {
1293         case NL80211_IFTYPE_ADHOC:
1294                 __cfg80211_leave_ibss(rdev, dev, true);
1295                 break;
1296         case NL80211_IFTYPE_P2P_CLIENT:
1297         case NL80211_IFTYPE_STATION:
1298                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1299                                          list) {
1300                         if (dev == pos->dev)
1301                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1302                 }
1303
1304 #ifdef CONFIG_CFG80211_WEXT
1305                 kfree(wdev->wext.ie);
1306                 wdev->wext.ie = NULL;
1307                 wdev->wext.ie_len = 0;
1308                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1309 #endif
1310                 cfg80211_disconnect(rdev, dev,
1311                                     WLAN_REASON_DEAUTH_LEAVING, true);
1312                 break;
1313         case NL80211_IFTYPE_MESH_POINT:
1314                 __cfg80211_leave_mesh(rdev, dev);
1315                 break;
1316         case NL80211_IFTYPE_AP:
1317         case NL80211_IFTYPE_P2P_GO:
1318                 __cfg80211_stop_ap(rdev, dev, -1, true);
1319                 break;
1320         case NL80211_IFTYPE_OCB:
1321                 __cfg80211_leave_ocb(rdev, dev);
1322                 break;
1323         case NL80211_IFTYPE_P2P_DEVICE:
1324         case NL80211_IFTYPE_NAN:
1325                 /* cannot happen, has no netdev */
1326                 break;
1327         case NL80211_IFTYPE_AP_VLAN:
1328         case NL80211_IFTYPE_MONITOR:
1329                 /* nothing to do */
1330                 break;
1331         case NL80211_IFTYPE_UNSPECIFIED:
1332         case NL80211_IFTYPE_WDS:
1333         case NUM_NL80211_IFTYPES:
1334                 /* invalid */
1335                 break;
1336         }
1337 }
1338
1339 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1340                     struct wireless_dev *wdev)
1341 {
1342         wdev_lock(wdev);
1343         __cfg80211_leave(rdev, wdev);
1344         wdev_unlock(wdev);
1345 }
1346
1347 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1348                          gfp_t gfp)
1349 {
1350         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1351         struct cfg80211_event *ev;
1352         unsigned long flags;
1353
1354         trace_cfg80211_stop_iface(wiphy, wdev);
1355
1356         ev = kzalloc(sizeof(*ev), gfp);
1357         if (!ev)
1358                 return;
1359
1360         ev->type = EVENT_STOPPED;
1361
1362         spin_lock_irqsave(&wdev->event_lock, flags);
1363         list_add_tail(&ev->list, &wdev->event_list);
1364         spin_unlock_irqrestore(&wdev->event_lock, flags);
1365         queue_work(cfg80211_wq, &rdev->event_work);
1366 }
1367 EXPORT_SYMBOL(cfg80211_stop_iface);
1368
1369 void cfg80211_init_wdev(struct wireless_dev *wdev)
1370 {
1371         mutex_init(&wdev->mtx);
1372         INIT_LIST_HEAD(&wdev->event_list);
1373         spin_lock_init(&wdev->event_lock);
1374         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1375         INIT_LIST_HEAD(&wdev->pmsr_list);
1376         spin_lock_init(&wdev->pmsr_lock);
1377         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1378
1379 #ifdef CONFIG_CFG80211_WEXT
1380         wdev->wext.default_key = -1;
1381         wdev->wext.default_mgmt_key = -1;
1382         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1383 #endif
1384
1385         wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1386
1387         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1388                 wdev->ps = true;
1389         else
1390                 wdev->ps = false;
1391         /* allow mac80211 to determine the timeout */
1392         wdev->ps_timeout = -1;
1393
1394         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1395              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1396              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1397                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1398
1399         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1400 }
1401
1402 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1403                             struct wireless_dev *wdev)
1404 {
1405         ASSERT_RTNL();
1406         lockdep_assert_held(&rdev->wiphy.mtx);
1407
1408         /*
1409          * We get here also when the interface changes network namespaces,
1410          * as it's registered into the new one, but we don't want it to
1411          * change ID in that case. Checking if the ID is already assigned
1412          * works, because 0 isn't considered a valid ID and the memory is
1413          * 0-initialized.
1414          */
1415         if (!wdev->identifier)
1416                 wdev->identifier = ++rdev->wdev_id;
1417         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1418         rdev->devlist_generation++;
1419         wdev->registered = true;
1420
1421         if (wdev->netdev &&
1422             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1423                               "phy80211"))
1424                 pr_err("failed to add phy80211 symlink to netdev!\n");
1425
1426         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1427 }
1428
1429 int cfg80211_register_netdevice(struct net_device *dev)
1430 {
1431         struct wireless_dev *wdev = dev->ieee80211_ptr;
1432         struct cfg80211_registered_device *rdev;
1433         int ret;
1434
1435         ASSERT_RTNL();
1436
1437         if (WARN_ON(!wdev))
1438                 return -EINVAL;
1439
1440         rdev = wiphy_to_rdev(wdev->wiphy);
1441
1442         lockdep_assert_held(&rdev->wiphy.mtx);
1443
1444         /* we'll take care of this */
1445         wdev->registered = true;
1446         wdev->registering = true;
1447         ret = register_netdevice(dev);
1448         if (ret)
1449                 goto out;
1450
1451         cfg80211_register_wdev(rdev, wdev);
1452         ret = 0;
1453 out:
1454         wdev->registering = false;
1455         if (ret)
1456                 wdev->registered = false;
1457         return ret;
1458 }
1459 EXPORT_SYMBOL(cfg80211_register_netdevice);
1460
1461 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1462                                          unsigned long state, void *ptr)
1463 {
1464         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1465         struct wireless_dev *wdev = dev->ieee80211_ptr;
1466         struct cfg80211_registered_device *rdev;
1467         struct cfg80211_sched_scan_request *pos, *tmp;
1468
1469         if (!wdev)
1470                 return NOTIFY_DONE;
1471
1472         rdev = wiphy_to_rdev(wdev->wiphy);
1473
1474         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1475
1476         switch (state) {
1477         case NETDEV_POST_INIT:
1478                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1479                 wdev->netdev = dev;
1480                 /* can only change netns with wiphy */
1481                 dev->features |= NETIF_F_NETNS_LOCAL;
1482
1483                 cfg80211_init_wdev(wdev);
1484                 break;
1485         case NETDEV_REGISTER:
1486                 if (!wdev->registered) {
1487                         wiphy_lock(&rdev->wiphy);
1488                         cfg80211_register_wdev(rdev, wdev);
1489                         wiphy_unlock(&rdev->wiphy);
1490                 }
1491                 break;
1492         case NETDEV_UNREGISTER:
1493                 /*
1494                  * It is possible to get NETDEV_UNREGISTER multiple times,
1495                  * so check wdev->registered.
1496                  */
1497                 if (wdev->registered && !wdev->registering) {
1498                         wiphy_lock(&rdev->wiphy);
1499                         _cfg80211_unregister_wdev(wdev, false);
1500                         wiphy_unlock(&rdev->wiphy);
1501                 }
1502                 break;
1503         case NETDEV_GOING_DOWN:
1504                 wiphy_lock(&rdev->wiphy);
1505                 cfg80211_leave(rdev, wdev);
1506                 cfg80211_remove_links(wdev);
1507                 wiphy_unlock(&rdev->wiphy);
1508                 /* since we just did cfg80211_leave() nothing to do there */
1509                 cancel_work_sync(&wdev->disconnect_wk);
1510                 cancel_work_sync(&wdev->pmsr_free_wk);
1511                 break;
1512         case NETDEV_DOWN:
1513                 wiphy_lock(&rdev->wiphy);
1514                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1515                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1516                         if (WARN_ON(!rdev->scan_req->notified &&
1517                                     (!rdev->int_scan_req ||
1518                                      !rdev->int_scan_req->notified)))
1519                                 rdev->scan_req->info.aborted = true;
1520                         ___cfg80211_scan_done(rdev, false);
1521                 }
1522
1523                 list_for_each_entry_safe(pos, tmp,
1524                                          &rdev->sched_scan_req_list, list) {
1525                         if (WARN_ON(pos->dev == wdev->netdev))
1526                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1527                 }
1528
1529                 rdev->opencount--;
1530                 wiphy_unlock(&rdev->wiphy);
1531                 wake_up(&rdev->dev_wait);
1532                 break;
1533         case NETDEV_UP:
1534                 wiphy_lock(&rdev->wiphy);
1535                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1536                 wdev_lock(wdev);
1537                 switch (wdev->iftype) {
1538 #ifdef CONFIG_CFG80211_WEXT
1539                 case NL80211_IFTYPE_ADHOC:
1540                         cfg80211_ibss_wext_join(rdev, wdev);
1541                         break;
1542                 case NL80211_IFTYPE_STATION:
1543                         cfg80211_mgd_wext_connect(rdev, wdev);
1544                         break;
1545 #endif
1546 #ifdef CONFIG_MAC80211_MESH
1547                 case NL80211_IFTYPE_MESH_POINT:
1548                         {
1549                                 /* backward compat code... */
1550                                 struct mesh_setup setup;
1551                                 memcpy(&setup, &default_mesh_setup,
1552                                                 sizeof(setup));
1553                                  /* back compat only needed for mesh_id */
1554                                 setup.mesh_id = wdev->u.mesh.id;
1555                                 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1556                                 if (wdev->u.mesh.id_up_len)
1557                                         __cfg80211_join_mesh(rdev, dev,
1558                                                         &setup,
1559                                                         &default_mesh_config);
1560                                 break;
1561                         }
1562 #endif
1563                 default:
1564                         break;
1565                 }
1566                 wdev_unlock(wdev);
1567                 rdev->opencount++;
1568
1569                 /*
1570                  * Configure power management to the driver here so that its
1571                  * correctly set also after interface type changes etc.
1572                  */
1573                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1574                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1575                     rdev->ops->set_power_mgmt &&
1576                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1577                                         wdev->ps_timeout)) {
1578                         /* assume this means it's off */
1579                         wdev->ps = false;
1580                 }
1581                 wiphy_unlock(&rdev->wiphy);
1582                 break;
1583         case NETDEV_PRE_UP:
1584                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1585                                              wdev->use_4addr, 0))
1586                         return notifier_from_errno(-EOPNOTSUPP);
1587
1588                 if (rfkill_blocked(rdev->wiphy.rfkill))
1589                         return notifier_from_errno(-ERFKILL);
1590                 break;
1591         default:
1592                 return NOTIFY_DONE;
1593         }
1594
1595         wireless_nlevent_flush();
1596
1597         return NOTIFY_OK;
1598 }
1599
1600 static struct notifier_block cfg80211_netdev_notifier = {
1601         .notifier_call = cfg80211_netdev_notifier_call,
1602 };
1603
1604 static void __net_exit cfg80211_pernet_exit(struct net *net)
1605 {
1606         struct cfg80211_registered_device *rdev;
1607
1608         rtnl_lock();
1609         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1610                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1611                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1612         }
1613         rtnl_unlock();
1614 }
1615
1616 static struct pernet_operations cfg80211_pernet_ops = {
1617         .exit = cfg80211_pernet_exit,
1618 };
1619
1620 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1621 {
1622         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1623         unsigned long flags;
1624
1625         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1626         if (list_empty(&work->entry))
1627                 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1628         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1629
1630         queue_work(system_unbound_wq, &rdev->wiphy_work);
1631 }
1632 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1633
1634 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1635 {
1636         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1637         unsigned long flags;
1638
1639         lockdep_assert_held(&wiphy->mtx);
1640
1641         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1642         if (!list_empty(&work->entry))
1643                 list_del_init(&work->entry);
1644         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1645 }
1646 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1647
1648 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1649 {
1650         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1651         unsigned long flags;
1652         bool run;
1653
1654         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1655         run = !work || !list_empty(&work->entry);
1656         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1657
1658         if (run)
1659                 cfg80211_process_wiphy_works(rdev, work);
1660 }
1661 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1662
1663 void wiphy_delayed_work_timer(struct timer_list *t)
1664 {
1665         struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1666
1667         wiphy_work_queue(dwork->wiphy, &dwork->work);
1668 }
1669 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1670
1671 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1672                               struct wiphy_delayed_work *dwork,
1673                               unsigned long delay)
1674 {
1675         if (!delay) {
1676                 wiphy_work_queue(wiphy, &dwork->work);
1677                 return;
1678         }
1679
1680         dwork->wiphy = wiphy;
1681         mod_timer(&dwork->timer, jiffies + delay);
1682 }
1683 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1684
1685 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1686                                struct wiphy_delayed_work *dwork)
1687 {
1688         lockdep_assert_held(&wiphy->mtx);
1689
1690         del_timer_sync(&dwork->timer);
1691         wiphy_work_cancel(wiphy, &dwork->work);
1692 }
1693 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1694
1695 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1696                               struct wiphy_delayed_work *dwork)
1697 {
1698         lockdep_assert_held(&wiphy->mtx);
1699
1700         del_timer_sync(&dwork->timer);
1701         wiphy_work_flush(wiphy, &dwork->work);
1702 }
1703 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1704
1705 static int __init cfg80211_init(void)
1706 {
1707         int err;
1708
1709         err = register_pernet_device(&cfg80211_pernet_ops);
1710         if (err)
1711                 goto out_fail_pernet;
1712
1713         err = wiphy_sysfs_init();
1714         if (err)
1715                 goto out_fail_sysfs;
1716
1717         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1718         if (err)
1719                 goto out_fail_notifier;
1720
1721         err = nl80211_init();
1722         if (err)
1723                 goto out_fail_nl80211;
1724
1725         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1726
1727         err = regulatory_init();
1728         if (err)
1729                 goto out_fail_reg;
1730
1731         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1732         if (!cfg80211_wq) {
1733                 err = -ENOMEM;
1734                 goto out_fail_wq;
1735         }
1736
1737         return 0;
1738
1739 out_fail_wq:
1740         regulatory_exit();
1741 out_fail_reg:
1742         debugfs_remove(ieee80211_debugfs_dir);
1743         nl80211_exit();
1744 out_fail_nl80211:
1745         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1746 out_fail_notifier:
1747         wiphy_sysfs_exit();
1748 out_fail_sysfs:
1749         unregister_pernet_device(&cfg80211_pernet_ops);
1750 out_fail_pernet:
1751         return err;
1752 }
1753 fs_initcall(cfg80211_init);
1754
1755 static void __exit cfg80211_exit(void)
1756 {
1757         debugfs_remove(ieee80211_debugfs_dir);
1758         nl80211_exit();
1759         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1760         wiphy_sysfs_exit();
1761         regulatory_exit();
1762         unregister_pernet_device(&cfg80211_pernet_ops);
1763         destroy_workqueue(cfg80211_wq);
1764 }
1765 module_exit(cfg80211_exit);