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TOMOYO Linux Cross Reference
Linux/net/wireless/core.c

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  1 /*
  2  * This is the linux wireless configuration interface.
  3  *
  4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
  5  * Copyright 2013-2014  Intel Mobile Communications GmbH
  6  * Copyright 2015-2017  Intel Deutschland GmbH
  7  * Copyright (C) 2018 Intel Corporation
  8  */
  9 
 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 11 
 12 #include <linux/if.h>
 13 #include <linux/module.h>
 14 #include <linux/err.h>
 15 #include <linux/list.h>
 16 #include <linux/slab.h>
 17 #include <linux/nl80211.h>
 18 #include <linux/debugfs.h>
 19 #include <linux/notifier.h>
 20 #include <linux/device.h>
 21 #include <linux/etherdevice.h>
 22 #include <linux/rtnetlink.h>
 23 #include <linux/sched.h>
 24 #include <net/genetlink.h>
 25 #include <net/cfg80211.h>
 26 #include "nl80211.h"
 27 #include "core.h"
 28 #include "sysfs.h"
 29 #include "debugfs.h"
 30 #include "wext-compat.h"
 31 #include "rdev-ops.h"
 32 
 33 /* name for sysfs, %d is appended */
 34 #define PHY_NAME "phy"
 35 
 36 MODULE_AUTHOR("Johannes Berg");
 37 MODULE_LICENSE("GPL");
 38 MODULE_DESCRIPTION("wireless configuration support");
 39 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
 40 
 41 /* RCU-protected (and RTNL for writers) */
 42 LIST_HEAD(cfg80211_rdev_list);
 43 int cfg80211_rdev_list_generation;
 44 
 45 /* for debugfs */
 46 static struct dentry *ieee80211_debugfs_dir;
 47 
 48 /* for the cleanup, scan and event works */
 49 struct workqueue_struct *cfg80211_wq;
 50 
 51 static bool cfg80211_disable_40mhz_24ghz;
 52 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
 53 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
 54                  "Disable 40MHz support in the 2.4GHz band");
 55 
 56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
 57 {
 58         struct cfg80211_registered_device *result = NULL, *rdev;
 59 
 60         ASSERT_RTNL();
 61 
 62         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 63                 if (rdev->wiphy_idx == wiphy_idx) {
 64                         result = rdev;
 65                         break;
 66                 }
 67         }
 68 
 69         return result;
 70 }
 71 
 72 int get_wiphy_idx(struct wiphy *wiphy)
 73 {
 74         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 75 
 76         return rdev->wiphy_idx;
 77 }
 78 
 79 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
 80 {
 81         struct cfg80211_registered_device *rdev;
 82 
 83         ASSERT_RTNL();
 84 
 85         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
 86         if (!rdev)
 87                 return NULL;
 88         return &rdev->wiphy;
 89 }
 90 
 91 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
 92                                    const char *newname)
 93 {
 94         struct cfg80211_registered_device *rdev2;
 95         int wiphy_idx, taken = -1, digits;
 96 
 97         ASSERT_RTNL();
 98 
 99         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
100                 return -EINVAL;
101 
102         /* prohibit calling the thing phy%d when %d is not its number */
103         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
104         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
105                 /* count number of places needed to print wiphy_idx */
106                 digits = 1;
107                 while (wiphy_idx /= 10)
108                         digits++;
109                 /*
110                  * deny the name if it is phy<idx> where <idx> is printed
111                  * without leading zeroes. taken == strlen(newname) here
112                  */
113                 if (taken == strlen(PHY_NAME) + digits)
114                         return -EINVAL;
115         }
116 
117         /* Ensure another device does not already have this name. */
118         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
119                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
120                         return -EINVAL;
121 
122         return 0;
123 }
124 
125 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
126                         char *newname)
127 {
128         int result;
129 
130         ASSERT_RTNL();
131 
132         /* Ignore nop renames */
133         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
134                 return 0;
135 
136         result = cfg80211_dev_check_name(rdev, newname);
137         if (result < 0)
138                 return result;
139 
140         result = device_rename(&rdev->wiphy.dev, newname);
141         if (result)
142                 return result;
143 
144         if (rdev->wiphy.debugfsdir &&
145             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
146                             rdev->wiphy.debugfsdir,
147                             rdev->wiphy.debugfsdir->d_parent,
148                             newname))
149                 pr_err("failed to rename debugfs dir to %s!\n", 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         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
200 
201         wiphy_net_set(&rdev->wiphy, net);
202 
203         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
204         WARN_ON(err);
205 
206         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
207         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
208                 if (!wdev->netdev)
209                         continue;
210                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
211         }
212 
213         return 0;
214 }
215 
216 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
217 {
218         struct cfg80211_registered_device *rdev = data;
219 
220         rdev_rfkill_poll(rdev);
221 }
222 
223 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
224                               struct wireless_dev *wdev)
225 {
226         ASSERT_RTNL();
227 
228         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
229                 return;
230 
231         if (!wdev_running(wdev))
232                 return;
233 
234         rdev_stop_p2p_device(rdev, wdev);
235         wdev->is_running = false;
236 
237         rdev->opencount--;
238 
239         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
240                 if (WARN_ON(!rdev->scan_req->notified))
241                         rdev->scan_req->info.aborted = true;
242                 ___cfg80211_scan_done(rdev, false);
243         }
244 }
245 
246 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
247                        struct wireless_dev *wdev)
248 {
249         ASSERT_RTNL();
250 
251         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
252                 return;
253 
254         if (!wdev_running(wdev))
255                 return;
256 
257         rdev_stop_nan(rdev, wdev);
258         wdev->is_running = false;
259 
260         rdev->opencount--;
261 }
262 
263 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
264 {
265         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
266         struct wireless_dev *wdev;
267 
268         ASSERT_RTNL();
269 
270         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
271                 if (wdev->netdev) {
272                         dev_close(wdev->netdev);
273                         continue;
274                 }
275                 /* otherwise, check iftype */
276                 switch (wdev->iftype) {
277                 case NL80211_IFTYPE_P2P_DEVICE:
278                         cfg80211_stop_p2p_device(rdev, wdev);
279                         break;
280                 case NL80211_IFTYPE_NAN:
281                         cfg80211_stop_nan(rdev, wdev);
282                         break;
283                 default:
284                         break;
285                 }
286         }
287 }
288 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
289 
290 static int cfg80211_rfkill_set_block(void *data, bool blocked)
291 {
292         struct cfg80211_registered_device *rdev = data;
293 
294         if (!blocked)
295                 return 0;
296 
297         rtnl_lock();
298         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
299         rtnl_unlock();
300 
301         return 0;
302 }
303 
304 static void cfg80211_rfkill_sync_work(struct work_struct *work)
305 {
306         struct cfg80211_registered_device *rdev;
307 
308         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
309         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
310 }
311 
312 static void cfg80211_event_work(struct work_struct *work)
313 {
314         struct cfg80211_registered_device *rdev;
315 
316         rdev = container_of(work, struct cfg80211_registered_device,
317                             event_work);
318 
319         rtnl_lock();
320         cfg80211_process_rdev_events(rdev);
321         rtnl_unlock();
322 }
323 
324 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
325 {
326         struct wireless_dev *wdev, *tmp;
327 
328         ASSERT_RTNL();
329 
330         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
331                 if (wdev->nl_owner_dead)
332                         rdev_del_virtual_intf(rdev, wdev);
333         }
334 }
335 
336 static void cfg80211_destroy_iface_wk(struct work_struct *work)
337 {
338         struct cfg80211_registered_device *rdev;
339 
340         rdev = container_of(work, struct cfg80211_registered_device,
341                             destroy_work);
342 
343         rtnl_lock();
344         cfg80211_destroy_ifaces(rdev);
345         rtnl_unlock();
346 }
347 
348 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
349 {
350         struct cfg80211_registered_device *rdev;
351         struct cfg80211_sched_scan_request *req, *tmp;
352 
353         rdev = container_of(work, struct cfg80211_registered_device,
354                            sched_scan_stop_wk);
355 
356         rtnl_lock();
357         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
358                 if (req->nl_owner_dead)
359                         cfg80211_stop_sched_scan_req(rdev, req, false);
360         }
361         rtnl_unlock();
362 }
363 
364 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
365 {
366         struct cfg80211_registered_device *rdev;
367 
368         rdev = container_of(work, struct cfg80211_registered_device,
369                             propagate_radar_detect_wk);
370 
371         rtnl_lock();
372 
373         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
374                                        NL80211_DFS_UNAVAILABLE,
375                                        NL80211_RADAR_DETECTED);
376 
377         rtnl_unlock();
378 }
379 
380 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
381 {
382         struct cfg80211_registered_device *rdev;
383 
384         rdev = container_of(work, struct cfg80211_registered_device,
385                             propagate_cac_done_wk);
386 
387         rtnl_lock();
388 
389         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
390                                        NL80211_DFS_AVAILABLE,
391                                        NL80211_RADAR_CAC_FINISHED);
392 
393         rtnl_unlock();
394 }
395 
396 /* exported functions */
397 
398 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
399                            const char *requested_name)
400 {
401         static atomic_t wiphy_counter = ATOMIC_INIT(0);
402 
403         struct cfg80211_registered_device *rdev;
404         int alloc_size;
405 
406         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
407         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
408         WARN_ON(ops->connect && !ops->disconnect);
409         WARN_ON(ops->join_ibss && !ops->leave_ibss);
410         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
411         WARN_ON(ops->add_station && !ops->del_station);
412         WARN_ON(ops->add_mpath && !ops->del_mpath);
413         WARN_ON(ops->join_mesh && !ops->leave_mesh);
414         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
415         WARN_ON(ops->start_ap && !ops->stop_ap);
416         WARN_ON(ops->join_ocb && !ops->leave_ocb);
417         WARN_ON(ops->suspend && !ops->resume);
418         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
419         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
420         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
421         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
422 
423         alloc_size = sizeof(*rdev) + sizeof_priv;
424 
425         rdev = kzalloc(alloc_size, GFP_KERNEL);
426         if (!rdev)
427                 return NULL;
428 
429         rdev->ops = ops;
430 
431         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
432 
433         if (unlikely(rdev->wiphy_idx < 0)) {
434                 /* ugh, wrapped! */
435                 atomic_dec(&wiphy_counter);
436                 kfree(rdev);
437                 return NULL;
438         }
439 
440         /* atomic_inc_return makes it start at 1, make it start at 0 */
441         rdev->wiphy_idx--;
442 
443         /* give it a proper name */
444         if (requested_name && requested_name[0]) {
445                 int rv;
446 
447                 rtnl_lock();
448                 rv = cfg80211_dev_check_name(rdev, requested_name);
449 
450                 if (rv < 0) {
451                         rtnl_unlock();
452                         goto use_default_name;
453                 }
454 
455                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
456                 rtnl_unlock();
457                 if (rv)
458                         goto use_default_name;
459         } else {
460                 int rv;
461 
462 use_default_name:
463                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
464                  * the restrictions on phy names.  Probably this call could
465                  * fail if some other part of the kernel (re)named a device
466                  * phyX.  But, might should add some locking and check return
467                  * value, and use a different name if this one exists?
468                  */
469                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
470                 if (rv < 0) {
471                         kfree(rdev);
472                         return NULL;
473                 }
474         }
475 
476         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
477         INIT_LIST_HEAD(&rdev->beacon_registrations);
478         spin_lock_init(&rdev->beacon_registrations_lock);
479         spin_lock_init(&rdev->bss_lock);
480         INIT_LIST_HEAD(&rdev->bss_list);
481         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
482         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
483         INIT_LIST_HEAD(&rdev->mlme_unreg);
484         spin_lock_init(&rdev->mlme_unreg_lock);
485         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
486         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
487                           cfg80211_dfs_channels_update_work);
488 #ifdef CONFIG_CFG80211_WEXT
489         rdev->wiphy.wext = &cfg80211_wext_handler;
490 #endif
491 
492         device_initialize(&rdev->wiphy.dev);
493         rdev->wiphy.dev.class = &ieee80211_class;
494         rdev->wiphy.dev.platform_data = rdev;
495         device_enable_async_suspend(&rdev->wiphy.dev);
496 
497         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
498         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
499         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
500         INIT_WORK(&rdev->propagate_radar_detect_wk,
501                   cfg80211_propagate_radar_detect_wk);
502         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
503 
504 #ifdef CONFIG_CFG80211_DEFAULT_PS
505         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
506 #endif
507 
508         wiphy_net_set(&rdev->wiphy, &init_net);
509 
510         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
511         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
512                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
513                                    &rdev->rfkill_ops, rdev);
514 
515         if (!rdev->rfkill) {
516                 kfree(rdev);
517                 return NULL;
518         }
519 
520         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
521         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
522         INIT_WORK(&rdev->event_work, cfg80211_event_work);
523 
524         init_waitqueue_head(&rdev->dev_wait);
525 
526         /*
527          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
528          * Fragmentation and RTS threshold are disabled by default with the
529          * special -1 value.
530          */
531         rdev->wiphy.retry_short = 7;
532         rdev->wiphy.retry_long = 4;
533         rdev->wiphy.frag_threshold = (u32) -1;
534         rdev->wiphy.rts_threshold = (u32) -1;
535         rdev->wiphy.coverage_class = 0;
536 
537         rdev->wiphy.max_num_csa_counters = 1;
538 
539         rdev->wiphy.max_sched_scan_plans = 1;
540         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
541 
542         return &rdev->wiphy;
543 }
544 EXPORT_SYMBOL(wiphy_new_nm);
545 
546 static int wiphy_verify_combinations(struct wiphy *wiphy)
547 {
548         const struct ieee80211_iface_combination *c;
549         int i, j;
550 
551         for (i = 0; i < wiphy->n_iface_combinations; i++) {
552                 u32 cnt = 0;
553                 u16 all_iftypes = 0;
554 
555                 c = &wiphy->iface_combinations[i];
556 
557                 /*
558                  * Combinations with just one interface aren't real,
559                  * however we make an exception for DFS.
560                  */
561                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
562                         return -EINVAL;
563 
564                 /* Need at least one channel */
565                 if (WARN_ON(!c->num_different_channels))
566                         return -EINVAL;
567 
568                 /*
569                  * Put a sane limit on maximum number of different
570                  * channels to simplify channel accounting code.
571                  */
572                 if (WARN_ON(c->num_different_channels >
573                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
574                         return -EINVAL;
575 
576                 /* DFS only works on one channel. */
577                 if (WARN_ON(c->radar_detect_widths &&
578                             (c->num_different_channels > 1)))
579                         return -EINVAL;
580 
581                 if (WARN_ON(!c->n_limits))
582                         return -EINVAL;
583 
584                 for (j = 0; j < c->n_limits; j++) {
585                         u16 types = c->limits[j].types;
586 
587                         /* interface types shouldn't overlap */
588                         if (WARN_ON(types & all_iftypes))
589                                 return -EINVAL;
590                         all_iftypes |= types;
591 
592                         if (WARN_ON(!c->limits[j].max))
593                                 return -EINVAL;
594 
595                         /* Shouldn't list software iftypes in combinations! */
596                         if (WARN_ON(wiphy->software_iftypes & types))
597                                 return -EINVAL;
598 
599                         /* Only a single P2P_DEVICE can be allowed */
600                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
601                                     c->limits[j].max > 1))
602                                 return -EINVAL;
603 
604                         /* Only a single NAN can be allowed */
605                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
606                                     c->limits[j].max > 1))
607                                 return -EINVAL;
608 
609                         /*
610                          * This isn't well-defined right now. If you have an
611                          * IBSS interface, then its beacon interval may change
612                          * by joining other networks, and nothing prevents it
613                          * from doing that.
614                          * So technically we probably shouldn't even allow AP
615                          * and IBSS in the same interface, but it seems that
616                          * some drivers support that, possibly only with fixed
617                          * beacon intervals for IBSS.
618                          */
619                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
620                                     c->beacon_int_min_gcd)) {
621                                 return -EINVAL;
622                         }
623 
624                         cnt += c->limits[j].max;
625                         /*
626                          * Don't advertise an unsupported type
627                          * in a combination.
628                          */
629                         if (WARN_ON((wiphy->interface_modes & types) != types))
630                                 return -EINVAL;
631                 }
632 
633 #ifndef CONFIG_WIRELESS_WDS
634                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
635                         return -EINVAL;
636 #endif
637 
638                 /* You can't even choose that many! */
639                 if (WARN_ON(cnt < c->max_interfaces))
640                         return -EINVAL;
641         }
642 
643         return 0;
644 }
645 
646 int wiphy_register(struct wiphy *wiphy)
647 {
648         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
649         int res;
650         enum nl80211_band band;
651         struct ieee80211_supported_band *sband;
652         bool have_band = false;
653         int i;
654         u16 ifmodes = wiphy->interface_modes;
655 
656 #ifdef CONFIG_PM
657         if (WARN_ON(wiphy->wowlan &&
658                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
659                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
660                 return -EINVAL;
661         if (WARN_ON(wiphy->wowlan &&
662                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
663                     !wiphy->wowlan->tcp))
664                 return -EINVAL;
665 #endif
666         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
667                     (!rdev->ops->tdls_channel_switch ||
668                      !rdev->ops->tdls_cancel_channel_switch)))
669                 return -EINVAL;
670 
671         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
672                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
673                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
674                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
675                 return -EINVAL;
676 
677 #ifndef CONFIG_WIRELESS_WDS
678         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
679                 return -EINVAL;
680 #endif
681 
682         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
683                 return -EINVAL;
684 
685         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
686                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
687                             !wiphy->pmsr_capa->ftm.non_asap))
688                         return -EINVAL;
689                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
690                             !wiphy->pmsr_capa->ftm.bandwidths))
691                         return -EINVAL;
692                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
693                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
694                                   BIT(NL80211_PREAMBLE_HT) |
695                                   BIT(NL80211_PREAMBLE_VHT) |
696                                   BIT(NL80211_PREAMBLE_DMG))))
697                         return -EINVAL;
698                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
699                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
700                                   BIT(NL80211_CHAN_WIDTH_20) |
701                                   BIT(NL80211_CHAN_WIDTH_40) |
702                                   BIT(NL80211_CHAN_WIDTH_80) |
703                                   BIT(NL80211_CHAN_WIDTH_80P80) |
704                                   BIT(NL80211_CHAN_WIDTH_160) |
705                                   BIT(NL80211_CHAN_WIDTH_5) |
706                                   BIT(NL80211_CHAN_WIDTH_10))))
707                         return -EINVAL;
708         }
709 
710         /*
711          * if a wiphy has unsupported modes for regulatory channel enforcement,
712          * opt-out of enforcement checking
713          */
714         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
715                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
716                                        BIT(NL80211_IFTYPE_AP) |
717                                        BIT(NL80211_IFTYPE_P2P_GO) |
718                                        BIT(NL80211_IFTYPE_ADHOC) |
719                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
720                                        BIT(NL80211_IFTYPE_NAN) |
721                                        BIT(NL80211_IFTYPE_AP_VLAN) |
722                                        BIT(NL80211_IFTYPE_MONITOR)))
723                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
724 
725         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
726                     (wiphy->regulatory_flags &
727                                         (REGULATORY_CUSTOM_REG |
728                                          REGULATORY_STRICT_REG |
729                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
730                                          REGULATORY_COUNTRY_IE_IGNORE))))
731                 return -EINVAL;
732 
733         if (WARN_ON(wiphy->coalesce &&
734                     (!wiphy->coalesce->n_rules ||
735                      !wiphy->coalesce->n_patterns) &&
736                     (!wiphy->coalesce->pattern_min_len ||
737                      wiphy->coalesce->pattern_min_len >
738                         wiphy->coalesce->pattern_max_len)))
739                 return -EINVAL;
740 
741         if (WARN_ON(wiphy->ap_sme_capa &&
742                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
743                 return -EINVAL;
744 
745         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
746                 return -EINVAL;
747 
748         if (WARN_ON(wiphy->addresses &&
749                     !is_zero_ether_addr(wiphy->perm_addr) &&
750                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
751                            ETH_ALEN)))
752                 return -EINVAL;
753 
754         if (WARN_ON(wiphy->max_acl_mac_addrs &&
755                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
756                      !rdev->ops->set_mac_acl)))
757                 return -EINVAL;
758 
759         /* assure only valid behaviours are flagged by driver
760          * hence subtract 2 as bit 0 is invalid.
761          */
762         if (WARN_ON(wiphy->bss_select_support &&
763                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
764                 return -EINVAL;
765 
766         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
767                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
768                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
769                 return -EINVAL;
770 
771         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
772                     rdev->ops->update_connect_params))
773                 return -EINVAL;
774 
775         if (wiphy->addresses)
776                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
777 
778         /* sanity check ifmodes */
779         WARN_ON(!ifmodes);
780         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
781         if (WARN_ON(ifmodes != wiphy->interface_modes))
782                 wiphy->interface_modes = ifmodes;
783 
784         res = wiphy_verify_combinations(wiphy);
785         if (res)
786                 return res;
787 
788         /* sanity check supported bands/channels */
789         for (band = 0; band < NUM_NL80211_BANDS; band++) {
790                 u16 types = 0;
791 
792                 sband = wiphy->bands[band];
793                 if (!sband)
794                         continue;
795 
796                 sband->band = band;
797                 if (WARN_ON(!sband->n_channels))
798                         return -EINVAL;
799                 /*
800                  * on 60GHz band, there are no legacy rates, so
801                  * n_bitrates is 0
802                  */
803                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
804                             !sband->n_bitrates))
805                         return -EINVAL;
806 
807                 /*
808                  * Since cfg80211_disable_40mhz_24ghz is global, we can
809                  * modify the sband's ht data even if the driver uses a
810                  * global structure for that.
811                  */
812                 if (cfg80211_disable_40mhz_24ghz &&
813                     band == NL80211_BAND_2GHZ &&
814                     sband->ht_cap.ht_supported) {
815                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
816                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
817                 }
818 
819                 /*
820                  * Since we use a u32 for rate bitmaps in
821                  * ieee80211_get_response_rate, we cannot
822                  * have more than 32 legacy rates.
823                  */
824                 if (WARN_ON(sband->n_bitrates > 32))
825                         return -EINVAL;
826 
827                 for (i = 0; i < sband->n_channels; i++) {
828                         sband->channels[i].orig_flags =
829                                 sband->channels[i].flags;
830                         sband->channels[i].orig_mag = INT_MAX;
831                         sband->channels[i].orig_mpwr =
832                                 sband->channels[i].max_power;
833                         sband->channels[i].band = band;
834                 }
835 
836                 for (i = 0; i < sband->n_iftype_data; i++) {
837                         const struct ieee80211_sband_iftype_data *iftd;
838 
839                         iftd = &sband->iftype_data[i];
840 
841                         if (WARN_ON(!iftd->types_mask))
842                                 return -EINVAL;
843                         if (WARN_ON(types & iftd->types_mask))
844                                 return -EINVAL;
845 
846                         /* at least one piece of information must be present */
847                         if (WARN_ON(!iftd->he_cap.has_he))
848                                 return -EINVAL;
849 
850                         types |= iftd->types_mask;
851                 }
852 
853                 have_band = true;
854         }
855 
856         if (!have_band) {
857                 WARN_ON(1);
858                 return -EINVAL;
859         }
860 
861 #ifdef CONFIG_PM
862         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
863                     (!rdev->wiphy.wowlan->pattern_min_len ||
864                      rdev->wiphy.wowlan->pattern_min_len >
865                                 rdev->wiphy.wowlan->pattern_max_len)))
866                 return -EINVAL;
867 #endif
868 
869         /* check and set up bitrates */
870         ieee80211_set_bitrate_flags(wiphy);
871 
872         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
873 
874         rtnl_lock();
875         res = device_add(&rdev->wiphy.dev);
876         if (res) {
877                 rtnl_unlock();
878                 return res;
879         }
880 
881         /* set up regulatory info */
882         wiphy_regulatory_register(wiphy);
883 
884         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
885         cfg80211_rdev_list_generation++;
886 
887         /* add to debugfs */
888         rdev->wiphy.debugfsdir =
889                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
890                                    ieee80211_debugfs_dir);
891         if (IS_ERR(rdev->wiphy.debugfsdir))
892                 rdev->wiphy.debugfsdir = NULL;
893 
894         cfg80211_debugfs_rdev_add(rdev);
895         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
896 
897         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
898                 struct regulatory_request request;
899 
900                 request.wiphy_idx = get_wiphy_idx(wiphy);
901                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
902                 request.alpha2[0] = '9';
903                 request.alpha2[1] = '9';
904 
905                 nl80211_send_reg_change_event(&request);
906         }
907 
908         /* Check that nobody globally advertises any capabilities they do not
909          * advertise on all possible interface types.
910          */
911         if (wiphy->extended_capabilities_len &&
912             wiphy->num_iftype_ext_capab &&
913             wiphy->iftype_ext_capab) {
914                 u8 supported_on_all, j;
915                 const struct wiphy_iftype_ext_capab *capab;
916 
917                 capab = wiphy->iftype_ext_capab;
918                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
919                         if (capab[0].extended_capabilities_len > j)
920                                 supported_on_all =
921                                         capab[0].extended_capabilities[j];
922                         else
923                                 supported_on_all = 0x00;
924                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
925                                 if (j >= capab[i].extended_capabilities_len) {
926                                         supported_on_all = 0x00;
927                                         break;
928                                 }
929                                 supported_on_all &=
930                                         capab[i].extended_capabilities[j];
931                         }
932                         if (WARN_ON(wiphy->extended_capabilities[j] &
933                                     ~supported_on_all))
934                                 break;
935                 }
936         }
937 
938         rdev->wiphy.registered = true;
939         rtnl_unlock();
940 
941         res = rfkill_register(rdev->rfkill);
942         if (res) {
943                 rfkill_destroy(rdev->rfkill);
944                 rdev->rfkill = NULL;
945                 wiphy_unregister(&rdev->wiphy);
946                 return res;
947         }
948 
949         return 0;
950 }
951 EXPORT_SYMBOL(wiphy_register);
952 
953 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
954 {
955         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
956 
957         if (!rdev->ops->rfkill_poll)
958                 return;
959         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
960         rfkill_resume_polling(rdev->rfkill);
961 }
962 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
963 
964 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
965 {
966         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
967 
968         rfkill_pause_polling(rdev->rfkill);
969 }
970 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
971 
972 void wiphy_unregister(struct wiphy *wiphy)
973 {
974         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
975 
976         wait_event(rdev->dev_wait, ({
977                 int __count;
978                 rtnl_lock();
979                 __count = rdev->opencount;
980                 rtnl_unlock();
981                 __count == 0; }));
982 
983         if (rdev->rfkill)
984                 rfkill_unregister(rdev->rfkill);
985 
986         rtnl_lock();
987         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
988         rdev->wiphy.registered = false;
989 
990         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
991 
992         /*
993          * First remove the hardware from everywhere, this makes
994          * it impossible to find from userspace.
995          */
996         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
997         list_del_rcu(&rdev->list);
998         synchronize_rcu();
999 
1000         /*
1001          * If this device got a regulatory hint tell core its
1002          * free to listen now to a new shiny device regulatory hint
1003          */
1004         wiphy_regulatory_deregister(wiphy);
1005 
1006         cfg80211_rdev_list_generation++;
1007         device_del(&rdev->wiphy.dev);
1008 
1009         rtnl_unlock();
1010 
1011         flush_work(&rdev->scan_done_wk);
1012         cancel_work_sync(&rdev->conn_work);
1013         flush_work(&rdev->event_work);
1014         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1015         flush_work(&rdev->destroy_work);
1016         flush_work(&rdev->sched_scan_stop_wk);
1017         flush_work(&rdev->mlme_unreg_wk);
1018         flush_work(&rdev->propagate_radar_detect_wk);
1019         flush_work(&rdev->propagate_cac_done_wk);
1020 
1021 #ifdef CONFIG_PM
1022         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1023                 rdev_set_wakeup(rdev, false);
1024 #endif
1025         cfg80211_rdev_free_wowlan(rdev);
1026         cfg80211_rdev_free_coalesce(rdev);
1027 }
1028 EXPORT_SYMBOL(wiphy_unregister);
1029 
1030 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1031 {
1032         struct cfg80211_internal_bss *scan, *tmp;
1033         struct cfg80211_beacon_registration *reg, *treg;
1034         rfkill_destroy(rdev->rfkill);
1035         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1036                 list_del(&reg->list);
1037                 kfree(reg);
1038         }
1039         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1040                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1041         kfree(rdev);
1042 }
1043 
1044 void wiphy_free(struct wiphy *wiphy)
1045 {
1046         put_device(&wiphy->dev);
1047 }
1048 EXPORT_SYMBOL(wiphy_free);
1049 
1050 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1051 {
1052         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1053 
1054         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1055                 schedule_work(&rdev->rfkill_sync);
1056 }
1057 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1058 
1059 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1060 {
1061         kfree(wdev->cqm_config);
1062         wdev->cqm_config = NULL;
1063 }
1064 
1065 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1066 {
1067         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1068 
1069         ASSERT_RTNL();
1070 
1071         flush_work(&wdev->pmsr_free_wk);
1072 
1073         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1074 
1075         list_del_rcu(&wdev->list);
1076         if (sync)
1077                 synchronize_rcu();
1078         rdev->devlist_generation++;
1079 
1080         cfg80211_mlme_purge_registrations(wdev);
1081 
1082         switch (wdev->iftype) {
1083         case NL80211_IFTYPE_P2P_DEVICE:
1084                 cfg80211_stop_p2p_device(rdev, wdev);
1085                 break;
1086         case NL80211_IFTYPE_NAN:
1087                 cfg80211_stop_nan(rdev, wdev);
1088                 break;
1089         default:
1090                 break;
1091         }
1092 
1093 #ifdef CONFIG_CFG80211_WEXT
1094         kzfree(wdev->wext.keys);
1095 #endif
1096         /* only initialized if we have a netdev */
1097         if (wdev->netdev)
1098                 flush_work(&wdev->disconnect_wk);
1099 
1100         cfg80211_cqm_config_free(wdev);
1101 }
1102 
1103 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1104 {
1105         if (WARN_ON(wdev->netdev))
1106                 return;
1107 
1108         __cfg80211_unregister_wdev(wdev, true);
1109 }
1110 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1111 
1112 static const struct device_type wiphy_type = {
1113         .name   = "wlan",
1114 };
1115 
1116 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1117                                enum nl80211_iftype iftype, int num)
1118 {
1119         ASSERT_RTNL();
1120 
1121         rdev->num_running_ifaces += num;
1122         if (iftype == NL80211_IFTYPE_MONITOR)
1123                 rdev->num_running_monitor_ifaces += num;
1124 }
1125 
1126 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1127                       struct wireless_dev *wdev)
1128 {
1129         struct net_device *dev = wdev->netdev;
1130         struct cfg80211_sched_scan_request *pos, *tmp;
1131 
1132         ASSERT_RTNL();
1133         ASSERT_WDEV_LOCK(wdev);
1134 
1135         cfg80211_pmsr_wdev_down(wdev);
1136 
1137         switch (wdev->iftype) {
1138         case NL80211_IFTYPE_ADHOC:
1139                 __cfg80211_leave_ibss(rdev, dev, true);
1140                 break;
1141         case NL80211_IFTYPE_P2P_CLIENT:
1142         case NL80211_IFTYPE_STATION:
1143                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1144                                          list) {
1145                         if (dev == pos->dev)
1146                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1147                 }
1148 
1149 #ifdef CONFIG_CFG80211_WEXT
1150                 kfree(wdev->wext.ie);
1151                 wdev->wext.ie = NULL;
1152                 wdev->wext.ie_len = 0;
1153                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1154 #endif
1155                 cfg80211_disconnect(rdev, dev,
1156                                     WLAN_REASON_DEAUTH_LEAVING, true);
1157                 break;
1158         case NL80211_IFTYPE_MESH_POINT:
1159                 __cfg80211_leave_mesh(rdev, dev);
1160                 break;
1161         case NL80211_IFTYPE_AP:
1162         case NL80211_IFTYPE_P2P_GO:
1163                 __cfg80211_stop_ap(rdev, dev, true);
1164                 break;
1165         case NL80211_IFTYPE_OCB:
1166                 __cfg80211_leave_ocb(rdev, dev);
1167                 break;
1168         case NL80211_IFTYPE_WDS:
1169                 /* must be handled by mac80211/driver, has no APIs */
1170                 break;
1171         case NL80211_IFTYPE_P2P_DEVICE:
1172         case NL80211_IFTYPE_NAN:
1173                 /* cannot happen, has no netdev */
1174                 break;
1175         case NL80211_IFTYPE_AP_VLAN:
1176         case NL80211_IFTYPE_MONITOR:
1177                 /* nothing to do */
1178                 break;
1179         case NL80211_IFTYPE_UNSPECIFIED:
1180         case NUM_NL80211_IFTYPES:
1181                 /* invalid */
1182                 break;
1183         }
1184 }
1185 
1186 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1187                     struct wireless_dev *wdev)
1188 {
1189         wdev_lock(wdev);
1190         __cfg80211_leave(rdev, wdev);
1191         wdev_unlock(wdev);
1192 }
1193 
1194 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1195                          gfp_t gfp)
1196 {
1197         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1198         struct cfg80211_event *ev;
1199         unsigned long flags;
1200 
1201         trace_cfg80211_stop_iface(wiphy, wdev);
1202 
1203         ev = kzalloc(sizeof(*ev), gfp);
1204         if (!ev)
1205                 return;
1206 
1207         ev->type = EVENT_STOPPED;
1208 
1209         spin_lock_irqsave(&wdev->event_lock, flags);
1210         list_add_tail(&ev->list, &wdev->event_list);
1211         spin_unlock_irqrestore(&wdev->event_lock, flags);
1212         queue_work(cfg80211_wq, &rdev->event_work);
1213 }
1214 EXPORT_SYMBOL(cfg80211_stop_iface);
1215 
1216 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
1217                         struct wireless_dev *wdev)
1218 {
1219         mutex_init(&wdev->mtx);
1220         INIT_LIST_HEAD(&wdev->event_list);
1221         spin_lock_init(&wdev->event_lock);
1222         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1223         spin_lock_init(&wdev->mgmt_registrations_lock);
1224         INIT_LIST_HEAD(&wdev->pmsr_list);
1225         spin_lock_init(&wdev->pmsr_lock);
1226         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1227 
1228         /*
1229          * We get here also when the interface changes network namespaces,
1230          * as it's registered into the new one, but we don't want it to
1231          * change ID in that case. Checking if the ID is already assigned
1232          * works, because 0 isn't considered a valid ID and the memory is
1233          * 0-initialized.
1234          */
1235         if (!wdev->identifier)
1236                 wdev->identifier = ++rdev->wdev_id;
1237         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1238         rdev->devlist_generation++;
1239 
1240         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1241 }
1242 
1243 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1244                                          unsigned long state, void *ptr)
1245 {
1246         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1247         struct wireless_dev *wdev = dev->ieee80211_ptr;
1248         struct cfg80211_registered_device *rdev;
1249         struct cfg80211_sched_scan_request *pos, *tmp;
1250 
1251         if (!wdev)
1252                 return NOTIFY_DONE;
1253 
1254         rdev = wiphy_to_rdev(wdev->wiphy);
1255 
1256         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1257 
1258         switch (state) {
1259         case NETDEV_POST_INIT:
1260                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1261                 break;
1262         case NETDEV_REGISTER:
1263                 /*
1264                  * NB: cannot take rdev->mtx here because this may be
1265                  * called within code protected by it when interfaces
1266                  * are added with nl80211.
1267                  */
1268                 /* can only change netns with wiphy */
1269                 dev->features |= NETIF_F_NETNS_LOCAL;
1270 
1271                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1272                                       "phy80211")) {
1273                         pr_err("failed to add phy80211 symlink to netdev!\n");
1274                 }
1275                 wdev->netdev = dev;
1276 #ifdef CONFIG_CFG80211_WEXT
1277                 wdev->wext.default_key = -1;
1278                 wdev->wext.default_mgmt_key = -1;
1279                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1280 #endif
1281 
1282                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1283                         wdev->ps = true;
1284                 else
1285                         wdev->ps = false;
1286                 /* allow mac80211 to determine the timeout */
1287                 wdev->ps_timeout = -1;
1288 
1289                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1290                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1291                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1292                         dev->priv_flags |= IFF_DONT_BRIDGE;
1293 
1294                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1295 
1296                 cfg80211_init_wdev(rdev, wdev);
1297                 break;
1298         case NETDEV_GOING_DOWN:
1299                 cfg80211_leave(rdev, wdev);
1300                 break;
1301         case NETDEV_DOWN:
1302                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1303                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1304                         if (WARN_ON(!rdev->scan_req->notified))
1305                                 rdev->scan_req->info.aborted = true;
1306                         ___cfg80211_scan_done(rdev, false);
1307                 }
1308 
1309                 list_for_each_entry_safe(pos, tmp,
1310                                          &rdev->sched_scan_req_list, list) {
1311                         if (WARN_ON(pos->dev == wdev->netdev))
1312                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1313                 }
1314 
1315                 rdev->opencount--;
1316                 wake_up(&rdev->dev_wait);
1317                 break;
1318         case NETDEV_UP:
1319                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1320                 wdev_lock(wdev);
1321                 switch (wdev->iftype) {
1322 #ifdef CONFIG_CFG80211_WEXT
1323                 case NL80211_IFTYPE_ADHOC:
1324                         cfg80211_ibss_wext_join(rdev, wdev);
1325                         break;
1326                 case NL80211_IFTYPE_STATION:
1327                         cfg80211_mgd_wext_connect(rdev, wdev);
1328                         break;
1329 #endif
1330 #ifdef CONFIG_MAC80211_MESH
1331                 case NL80211_IFTYPE_MESH_POINT:
1332                         {
1333                                 /* backward compat code... */
1334                                 struct mesh_setup setup;
1335                                 memcpy(&setup, &default_mesh_setup,
1336                                                 sizeof(setup));
1337                                  /* back compat only needed for mesh_id */
1338                                 setup.mesh_id = wdev->ssid;
1339                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1340                                 if (wdev->mesh_id_up_len)
1341                                         __cfg80211_join_mesh(rdev, dev,
1342                                                         &setup,
1343                                                         &default_mesh_config);
1344                                 break;
1345                         }
1346 #endif
1347                 default:
1348                         break;
1349                 }
1350                 wdev_unlock(wdev);
1351                 rdev->opencount++;
1352 
1353                 /*
1354                  * Configure power management to the driver here so that its
1355                  * correctly set also after interface type changes etc.
1356                  */
1357                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1358                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1359                     rdev->ops->set_power_mgmt &&
1360                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1361                                         wdev->ps_timeout)) {
1362                         /* assume this means it's off */
1363                         wdev->ps = false;
1364                 }
1365                 break;
1366         case NETDEV_UNREGISTER:
1367                 /*
1368                  * It is possible to get NETDEV_UNREGISTER
1369                  * multiple times. To detect that, check
1370                  * that the interface is still on the list
1371                  * of registered interfaces, and only then
1372                  * remove and clean it up.
1373                  */
1374                 if (!list_empty(&wdev->list)) {
1375                         __cfg80211_unregister_wdev(wdev, false);
1376                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1377                 }
1378                 /*
1379                  * synchronise (so that we won't find this netdev
1380                  * from other code any more) and then clear the list
1381                  * head so that the above code can safely check for
1382                  * !list_empty() to avoid double-cleanup.
1383                  */
1384                 synchronize_rcu();
1385                 INIT_LIST_HEAD(&wdev->list);
1386                 /*
1387                  * Ensure that all events have been processed and
1388                  * freed.
1389                  */
1390                 cfg80211_process_wdev_events(wdev);
1391 
1392                 if (WARN_ON(wdev->current_bss)) {
1393                         cfg80211_unhold_bss(wdev->current_bss);
1394                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1395                         wdev->current_bss = NULL;
1396                 }
1397                 break;
1398         case NETDEV_PRE_UP:
1399                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1400                         return notifier_from_errno(-EOPNOTSUPP);
1401                 if (rfkill_blocked(rdev->rfkill))
1402                         return notifier_from_errno(-ERFKILL);
1403                 break;
1404         default:
1405                 return NOTIFY_DONE;
1406         }
1407 
1408         wireless_nlevent_flush();
1409 
1410         return NOTIFY_OK;
1411 }
1412 
1413 static struct notifier_block cfg80211_netdev_notifier = {
1414         .notifier_call = cfg80211_netdev_notifier_call,
1415 };
1416 
1417 static void __net_exit cfg80211_pernet_exit(struct net *net)
1418 {
1419         struct cfg80211_registered_device *rdev;
1420 
1421         rtnl_lock();
1422         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1423                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1424                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1425         }
1426         rtnl_unlock();
1427 }
1428 
1429 static struct pernet_operations cfg80211_pernet_ops = {
1430         .exit = cfg80211_pernet_exit,
1431 };
1432 
1433 static int __init cfg80211_init(void)
1434 {
1435         int err;
1436 
1437         err = register_pernet_device(&cfg80211_pernet_ops);
1438         if (err)
1439                 goto out_fail_pernet;
1440 
1441         err = wiphy_sysfs_init();
1442         if (err)
1443                 goto out_fail_sysfs;
1444 
1445         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1446         if (err)
1447                 goto out_fail_notifier;
1448 
1449         err = nl80211_init();
1450         if (err)
1451                 goto out_fail_nl80211;
1452 
1453         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1454 
1455         err = regulatory_init();
1456         if (err)
1457                 goto out_fail_reg;
1458 
1459         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1460         if (!cfg80211_wq) {
1461                 err = -ENOMEM;
1462                 goto out_fail_wq;
1463         }
1464 
1465         return 0;
1466 
1467 out_fail_wq:
1468         regulatory_exit();
1469 out_fail_reg:
1470         debugfs_remove(ieee80211_debugfs_dir);
1471         nl80211_exit();
1472 out_fail_nl80211:
1473         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1474 out_fail_notifier:
1475         wiphy_sysfs_exit();
1476 out_fail_sysfs:
1477         unregister_pernet_device(&cfg80211_pernet_ops);
1478 out_fail_pernet:
1479         return err;
1480 }
1481 fs_initcall(cfg80211_init);
1482 
1483 static void __exit cfg80211_exit(void)
1484 {
1485         debugfs_remove(ieee80211_debugfs_dir);
1486         nl80211_exit();
1487         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1488         wiphy_sysfs_exit();
1489         regulatory_exit();
1490         unregister_pernet_device(&cfg80211_pernet_ops);
1491         destroy_workqueue(cfg80211_wq);
1492 }
1493 module_exit(cfg80211_exit);
1494 

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