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

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  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) 2018-2020 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 
133         /* Ignore nop renames */
134         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
135                 return 0;
136 
137         result = cfg80211_dev_check_name(rdev, newname);
138         if (result < 0)
139                 return result;
140 
141         result = device_rename(&rdev->wiphy.dev, newname);
142         if (result)
143                 return result;
144 
145         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
146                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
147                                rdev->wiphy.debugfsdir,
148                                rdev->wiphy.debugfsdir->d_parent, newname);
149 
150         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
151 
152         return 0;
153 }
154 
155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
156                           struct net *net)
157 {
158         struct wireless_dev *wdev;
159         int err = 0;
160 
161         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
162                 return -EOPNOTSUPP;
163 
164         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
165                 if (!wdev->netdev)
166                         continue;
167                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
168                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
169                 if (err)
170                         break;
171                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
172         }
173 
174         if (err) {
175                 /* failed -- clean up to old netns */
176                 net = wiphy_net(&rdev->wiphy);
177 
178                 list_for_each_entry_continue_reverse(wdev,
179                                                      &rdev->wiphy.wdev_list,
180                                                      list) {
181                         if (!wdev->netdev)
182                                 continue;
183                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
184                         err = dev_change_net_namespace(wdev->netdev, net,
185                                                         "wlan%d");
186                         WARN_ON(err);
187                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
188                 }
189 
190                 return err;
191         }
192 
193         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
194                 if (!wdev->netdev)
195                         continue;
196                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
197         }
198         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
199 
200         wiphy_net_set(&rdev->wiphy, net);
201 
202         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
203         WARN_ON(err);
204 
205         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
206         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
207                 if (!wdev->netdev)
208                         continue;
209                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
210         }
211 
212         return 0;
213 }
214 
215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
216 {
217         struct cfg80211_registered_device *rdev = data;
218 
219         rdev_rfkill_poll(rdev);
220 }
221 
222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
223                               struct wireless_dev *wdev)
224 {
225         ASSERT_RTNL();
226 
227         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
228                 return;
229 
230         if (!wdev_running(wdev))
231                 return;
232 
233         rdev_stop_p2p_device(rdev, wdev);
234         wdev->is_running = false;
235 
236         rdev->opencount--;
237 
238         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
239                 if (WARN_ON(!rdev->scan_req->notified &&
240                             (!rdev->int_scan_req ||
241                              !rdev->int_scan_req->notified)))
242                         rdev->scan_req->info.aborted = true;
243                 ___cfg80211_scan_done(rdev, false);
244         }
245 }
246 
247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
248                        struct wireless_dev *wdev)
249 {
250         ASSERT_RTNL();
251 
252         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
253                 return;
254 
255         if (!wdev_running(wdev))
256                 return;
257 
258         rdev_stop_nan(rdev, wdev);
259         wdev->is_running = false;
260 
261         rdev->opencount--;
262 }
263 
264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
265 {
266         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
267         struct wireless_dev *wdev;
268 
269         ASSERT_RTNL();
270 
271         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
272                 if (wdev->netdev) {
273                         dev_close(wdev->netdev);
274                         continue;
275                 }
276                 /* otherwise, check iftype */
277                 switch (wdev->iftype) {
278                 case NL80211_IFTYPE_P2P_DEVICE:
279                         cfg80211_stop_p2p_device(rdev, wdev);
280                         break;
281                 case NL80211_IFTYPE_NAN:
282                         cfg80211_stop_nan(rdev, wdev);
283                         break;
284                 default:
285                         break;
286                 }
287         }
288 }
289 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
290 
291 static int cfg80211_rfkill_set_block(void *data, bool blocked)
292 {
293         struct cfg80211_registered_device *rdev = data;
294 
295         if (!blocked)
296                 return 0;
297 
298         rtnl_lock();
299         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
300         rtnl_unlock();
301 
302         return 0;
303 }
304 
305 static void cfg80211_rfkill_block_work(struct work_struct *work)
306 {
307         struct cfg80211_registered_device *rdev;
308 
309         rdev = container_of(work, struct cfg80211_registered_device,
310                             rfkill_block);
311         cfg80211_rfkill_set_block(rdev, true);
312 }
313 
314 static void cfg80211_event_work(struct work_struct *work)
315 {
316         struct cfg80211_registered_device *rdev;
317 
318         rdev = container_of(work, struct cfg80211_registered_device,
319                             event_work);
320 
321         rtnl_lock();
322         cfg80211_process_rdev_events(rdev);
323         rtnl_unlock();
324 }
325 
326 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
327 {
328         struct wireless_dev *wdev, *tmp;
329 
330         ASSERT_RTNL();
331 
332         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
333                 if (wdev->nl_owner_dead)
334                         rdev_del_virtual_intf(rdev, wdev);
335         }
336 }
337 
338 static void cfg80211_destroy_iface_wk(struct work_struct *work)
339 {
340         struct cfg80211_registered_device *rdev;
341 
342         rdev = container_of(work, struct cfg80211_registered_device,
343                             destroy_work);
344 
345         rtnl_lock();
346         cfg80211_destroy_ifaces(rdev);
347         rtnl_unlock();
348 }
349 
350 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
351 {
352         struct cfg80211_registered_device *rdev;
353         struct cfg80211_sched_scan_request *req, *tmp;
354 
355         rdev = container_of(work, struct cfg80211_registered_device,
356                            sched_scan_stop_wk);
357 
358         rtnl_lock();
359         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
360                 if (req->nl_owner_dead)
361                         cfg80211_stop_sched_scan_req(rdev, req, false);
362         }
363         rtnl_unlock();
364 }
365 
366 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
367 {
368         struct cfg80211_registered_device *rdev;
369 
370         rdev = container_of(work, struct cfg80211_registered_device,
371                             propagate_radar_detect_wk);
372 
373         rtnl_lock();
374 
375         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
376                                        NL80211_DFS_UNAVAILABLE,
377                                        NL80211_RADAR_DETECTED);
378 
379         rtnl_unlock();
380 }
381 
382 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
383 {
384         struct cfg80211_registered_device *rdev;
385 
386         rdev = container_of(work, struct cfg80211_registered_device,
387                             propagate_cac_done_wk);
388 
389         rtnl_lock();
390 
391         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
392                                        NL80211_DFS_AVAILABLE,
393                                        NL80211_RADAR_CAC_FINISHED);
394 
395         rtnl_unlock();
396 }
397 
398 /* exported functions */
399 
400 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
401                            const char *requested_name)
402 {
403         static atomic_t wiphy_counter = ATOMIC_INIT(0);
404 
405         struct cfg80211_registered_device *rdev;
406         int alloc_size;
407 
408         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
409         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
410         WARN_ON(ops->connect && !ops->disconnect);
411         WARN_ON(ops->join_ibss && !ops->leave_ibss);
412         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
413         WARN_ON(ops->add_station && !ops->del_station);
414         WARN_ON(ops->add_mpath && !ops->del_mpath);
415         WARN_ON(ops->join_mesh && !ops->leave_mesh);
416         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
417         WARN_ON(ops->start_ap && !ops->stop_ap);
418         WARN_ON(ops->join_ocb && !ops->leave_ocb);
419         WARN_ON(ops->suspend && !ops->resume);
420         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
421         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
422         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
423         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
424 
425         alloc_size = sizeof(*rdev) + sizeof_priv;
426 
427         rdev = kzalloc(alloc_size, GFP_KERNEL);
428         if (!rdev)
429                 return NULL;
430 
431         rdev->ops = ops;
432 
433         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
434 
435         if (unlikely(rdev->wiphy_idx < 0)) {
436                 /* ugh, wrapped! */
437                 atomic_dec(&wiphy_counter);
438                 kfree(rdev);
439                 return NULL;
440         }
441 
442         /* atomic_inc_return makes it start at 1, make it start at 0 */
443         rdev->wiphy_idx--;
444 
445         /* give it a proper name */
446         if (requested_name && requested_name[0]) {
447                 int rv;
448 
449                 rtnl_lock();
450                 rv = cfg80211_dev_check_name(rdev, requested_name);
451 
452                 if (rv < 0) {
453                         rtnl_unlock();
454                         goto use_default_name;
455                 }
456 
457                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
458                 rtnl_unlock();
459                 if (rv)
460                         goto use_default_name;
461         } else {
462                 int rv;
463 
464 use_default_name:
465                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
466                  * the restrictions on phy names.  Probably this call could
467                  * fail if some other part of the kernel (re)named a device
468                  * phyX.  But, might should add some locking and check return
469                  * value, and use a different name if this one exists?
470                  */
471                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
472                 if (rv < 0) {
473                         kfree(rdev);
474                         return NULL;
475                 }
476         }
477 
478         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
479         INIT_LIST_HEAD(&rdev->beacon_registrations);
480         spin_lock_init(&rdev->beacon_registrations_lock);
481         spin_lock_init(&rdev->bss_lock);
482         INIT_LIST_HEAD(&rdev->bss_list);
483         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
484         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
485         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
486                           cfg80211_dfs_channels_update_work);
487 #ifdef CONFIG_CFG80211_WEXT
488         rdev->wiphy.wext = &cfg80211_wext_handler;
489 #endif
490 
491         device_initialize(&rdev->wiphy.dev);
492         rdev->wiphy.dev.class = &ieee80211_class;
493         rdev->wiphy.dev.platform_data = rdev;
494         device_enable_async_suspend(&rdev->wiphy.dev);
495 
496         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
497         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
498         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
499         INIT_WORK(&rdev->propagate_radar_detect_wk,
500                   cfg80211_propagate_radar_detect_wk);
501         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
502         INIT_WORK(&rdev->mgmt_registrations_update_wk,
503                   cfg80211_mgmt_registrations_update_wk);
504 
505 #ifdef CONFIG_CFG80211_DEFAULT_PS
506         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
507 #endif
508 
509         wiphy_net_set(&rdev->wiphy, &init_net);
510 
511         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
512         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
513                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
514                                    &rdev->rfkill_ops, rdev);
515 
516         if (!rdev->rfkill) {
517                 wiphy_free(&rdev->wiphy);
518                 return NULL;
519         }
520 
521         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
522         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
523         INIT_WORK(&rdev->event_work, cfg80211_event_work);
524 
525         init_waitqueue_head(&rdev->dev_wait);
526 
527         /*
528          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
529          * Fragmentation and RTS threshold are disabled by default with the
530          * special -1 value.
531          */
532         rdev->wiphy.retry_short = 7;
533         rdev->wiphy.retry_long = 4;
534         rdev->wiphy.frag_threshold = (u32) -1;
535         rdev->wiphy.rts_threshold = (u32) -1;
536         rdev->wiphy.coverage_class = 0;
537 
538         rdev->wiphy.max_num_csa_counters = 1;
539 
540         rdev->wiphy.max_sched_scan_plans = 1;
541         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
542 
543         return &rdev->wiphy;
544 }
545 EXPORT_SYMBOL(wiphy_new_nm);
546 
547 static int wiphy_verify_combinations(struct wiphy *wiphy)
548 {
549         const struct ieee80211_iface_combination *c;
550         int i, j;
551 
552         for (i = 0; i < wiphy->n_iface_combinations; i++) {
553                 u32 cnt = 0;
554                 u16 all_iftypes = 0;
555 
556                 c = &wiphy->iface_combinations[i];
557 
558                 /*
559                  * Combinations with just one interface aren't real,
560                  * however we make an exception for DFS.
561                  */
562                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
563                         return -EINVAL;
564 
565                 /* Need at least one channel */
566                 if (WARN_ON(!c->num_different_channels))
567                         return -EINVAL;
568 
569                 /*
570                  * Put a sane limit on maximum number of different
571                  * channels to simplify channel accounting code.
572                  */
573                 if (WARN_ON(c->num_different_channels >
574                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
575                         return -EINVAL;
576 
577                 /* DFS only works on one channel. */
578                 if (WARN_ON(c->radar_detect_widths &&
579                             (c->num_different_channels > 1)))
580                         return -EINVAL;
581 
582                 if (WARN_ON(!c->n_limits))
583                         return -EINVAL;
584 
585                 for (j = 0; j < c->n_limits; j++) {
586                         u16 types = c->limits[j].types;
587 
588                         /* interface types shouldn't overlap */
589                         if (WARN_ON(types & all_iftypes))
590                                 return -EINVAL;
591                         all_iftypes |= types;
592 
593                         if (WARN_ON(!c->limits[j].max))
594                                 return -EINVAL;
595 
596                         /* Shouldn't list software iftypes in combinations! */
597                         if (WARN_ON(wiphy->software_iftypes & types))
598                                 return -EINVAL;
599 
600                         /* Only a single P2P_DEVICE can be allowed */
601                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
602                                     c->limits[j].max > 1))
603                                 return -EINVAL;
604 
605                         /* Only a single NAN can be allowed */
606                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
607                                     c->limits[j].max > 1))
608                                 return -EINVAL;
609 
610                         /*
611                          * This isn't well-defined right now. If you have an
612                          * IBSS interface, then its beacon interval may change
613                          * by joining other networks, and nothing prevents it
614                          * from doing that.
615                          * So technically we probably shouldn't even allow AP
616                          * and IBSS in the same interface, but it seems that
617                          * some drivers support that, possibly only with fixed
618                          * beacon intervals for IBSS.
619                          */
620                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
621                                     c->beacon_int_min_gcd)) {
622                                 return -EINVAL;
623                         }
624 
625                         cnt += c->limits[j].max;
626                         /*
627                          * Don't advertise an unsupported type
628                          * in a combination.
629                          */
630                         if (WARN_ON((wiphy->interface_modes & types) != types))
631                                 return -EINVAL;
632                 }
633 
634 #ifndef CONFIG_WIRELESS_WDS
635                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
636                         return -EINVAL;
637 #endif
638 
639                 /* You can't even choose that many! */
640                 if (WARN_ON(cnt < c->max_interfaces))
641                         return -EINVAL;
642         }
643 
644         return 0;
645 }
646 
647 int wiphy_register(struct wiphy *wiphy)
648 {
649         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
650         int res;
651         enum nl80211_band band;
652         struct ieee80211_supported_band *sband;
653         bool have_band = false;
654         int i;
655         u16 ifmodes = wiphy->interface_modes;
656 
657 #ifdef CONFIG_PM
658         if (WARN_ON(wiphy->wowlan &&
659                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
660                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
661                 return -EINVAL;
662         if (WARN_ON(wiphy->wowlan &&
663                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
664                     !wiphy->wowlan->tcp))
665                 return -EINVAL;
666 #endif
667         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
668                     (!rdev->ops->tdls_channel_switch ||
669                      !rdev->ops->tdls_cancel_channel_switch)))
670                 return -EINVAL;
671 
672         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
673                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
674                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
675                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
676                 return -EINVAL;
677 
678 #ifndef CONFIG_WIRELESS_WDS
679         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
680                 return -EINVAL;
681 #endif
682 
683         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
684                 return -EINVAL;
685 
686         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
687                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
688                             !wiphy->pmsr_capa->ftm.non_asap))
689                         return -EINVAL;
690                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
691                             !wiphy->pmsr_capa->ftm.bandwidths))
692                         return -EINVAL;
693                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
694                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
695                                   BIT(NL80211_PREAMBLE_HT) |
696                                   BIT(NL80211_PREAMBLE_VHT) |
697                                   BIT(NL80211_PREAMBLE_HE) |
698                                   BIT(NL80211_PREAMBLE_DMG))))
699                         return -EINVAL;
700                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
701                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
702                             !(wiphy->pmsr_capa->ftm.preambles &
703                               BIT(NL80211_PREAMBLE_HE))))
704                         return -EINVAL;
705                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
706                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
707                                   BIT(NL80211_CHAN_WIDTH_20) |
708                                   BIT(NL80211_CHAN_WIDTH_40) |
709                                   BIT(NL80211_CHAN_WIDTH_80) |
710                                   BIT(NL80211_CHAN_WIDTH_80P80) |
711                                   BIT(NL80211_CHAN_WIDTH_160) |
712                                   BIT(NL80211_CHAN_WIDTH_5) |
713                                   BIT(NL80211_CHAN_WIDTH_10))))
714                         return -EINVAL;
715         }
716 
717         /*
718          * if a wiphy has unsupported modes for regulatory channel enforcement,
719          * opt-out of enforcement checking
720          */
721         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
722                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
723                                        BIT(NL80211_IFTYPE_AP) |
724                                        BIT(NL80211_IFTYPE_P2P_GO) |
725                                        BIT(NL80211_IFTYPE_ADHOC) |
726                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
727                                        BIT(NL80211_IFTYPE_NAN) |
728                                        BIT(NL80211_IFTYPE_AP_VLAN) |
729                                        BIT(NL80211_IFTYPE_MONITOR)))
730                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
731 
732         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
733                     (wiphy->regulatory_flags &
734                                         (REGULATORY_CUSTOM_REG |
735                                          REGULATORY_STRICT_REG |
736                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
737                                          REGULATORY_COUNTRY_IE_IGNORE))))
738                 return -EINVAL;
739 
740         if (WARN_ON(wiphy->coalesce &&
741                     (!wiphy->coalesce->n_rules ||
742                      !wiphy->coalesce->n_patterns) &&
743                     (!wiphy->coalesce->pattern_min_len ||
744                      wiphy->coalesce->pattern_min_len >
745                         wiphy->coalesce->pattern_max_len)))
746                 return -EINVAL;
747 
748         if (WARN_ON(wiphy->ap_sme_capa &&
749                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
750                 return -EINVAL;
751 
752         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
753                 return -EINVAL;
754 
755         if (WARN_ON(wiphy->addresses &&
756                     !is_zero_ether_addr(wiphy->perm_addr) &&
757                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
758                            ETH_ALEN)))
759                 return -EINVAL;
760 
761         if (WARN_ON(wiphy->max_acl_mac_addrs &&
762                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
763                      !rdev->ops->set_mac_acl)))
764                 return -EINVAL;
765 
766         /* assure only valid behaviours are flagged by driver
767          * hence subtract 2 as bit 0 is invalid.
768          */
769         if (WARN_ON(wiphy->bss_select_support &&
770                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
771                 return -EINVAL;
772 
773         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
774                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
775                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
776                 return -EINVAL;
777 
778         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
779                     rdev->ops->update_connect_params))
780                 return -EINVAL;
781 
782         if (wiphy->addresses)
783                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
784 
785         /* sanity check ifmodes */
786         WARN_ON(!ifmodes);
787         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
788         if (WARN_ON(ifmodes != wiphy->interface_modes))
789                 wiphy->interface_modes = ifmodes;
790 
791         res = wiphy_verify_combinations(wiphy);
792         if (res)
793                 return res;
794 
795         /* sanity check supported bands/channels */
796         for (band = 0; band < NUM_NL80211_BANDS; band++) {
797                 u16 types = 0;
798                 bool have_he = false;
799 
800                 sband = wiphy->bands[band];
801                 if (!sband)
802                         continue;
803 
804                 sband->band = band;
805                 if (WARN_ON(!sband->n_channels))
806                         return -EINVAL;
807                 /*
808                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
809                  * n_bitrates is 0
810                  */
811                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
812                              band != NL80211_BAND_S1GHZ) &&
813                             !sband->n_bitrates))
814                         return -EINVAL;
815 
816                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
817                             (sband->ht_cap.ht_supported ||
818                              sband->vht_cap.vht_supported)))
819                         return -EINVAL;
820 
821                 /*
822                  * Since cfg80211_disable_40mhz_24ghz is global, we can
823                  * modify the sband's ht data even if the driver uses a
824                  * global structure for that.
825                  */
826                 if (cfg80211_disable_40mhz_24ghz &&
827                     band == NL80211_BAND_2GHZ &&
828                     sband->ht_cap.ht_supported) {
829                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
830                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
831                 }
832 
833                 /*
834                  * Since we use a u32 for rate bitmaps in
835                  * ieee80211_get_response_rate, we cannot
836                  * have more than 32 legacy rates.
837                  */
838                 if (WARN_ON(sband->n_bitrates > 32))
839                         return -EINVAL;
840 
841                 for (i = 0; i < sband->n_channels; i++) {
842                         sband->channels[i].orig_flags =
843                                 sband->channels[i].flags;
844                         sband->channels[i].orig_mag = INT_MAX;
845                         sband->channels[i].orig_mpwr =
846                                 sband->channels[i].max_power;
847                         sband->channels[i].band = band;
848 
849                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
850                                 return -EINVAL;
851                 }
852 
853                 for (i = 0; i < sband->n_iftype_data; i++) {
854                         const struct ieee80211_sband_iftype_data *iftd;
855 
856                         iftd = &sband->iftype_data[i];
857 
858                         if (WARN_ON(!iftd->types_mask))
859                                 return -EINVAL;
860                         if (WARN_ON(types & iftd->types_mask))
861                                 return -EINVAL;
862 
863                         /* at least one piece of information must be present */
864                         if (WARN_ON(!iftd->he_cap.has_he))
865                                 return -EINVAL;
866 
867                         types |= iftd->types_mask;
868 
869                         if (i == 0)
870                                 have_he = iftd->he_cap.has_he;
871                         else
872                                 have_he = have_he &&
873                                           iftd->he_cap.has_he;
874                 }
875 
876                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
877                         return -EINVAL;
878 
879                 have_band = true;
880         }
881 
882         if (!have_band) {
883                 WARN_ON(1);
884                 return -EINVAL;
885         }
886 
887         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
888                 /*
889                  * Validate we have a policy (can be explicitly set to
890                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
891                  * we have at least one of doit/dumpit.
892                  */
893                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
894                         return -EINVAL;
895                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
896                             !rdev->wiphy.vendor_commands[i].dumpit))
897                         return -EINVAL;
898         }
899 
900 #ifdef CONFIG_PM
901         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
902                     (!rdev->wiphy.wowlan->pattern_min_len ||
903                      rdev->wiphy.wowlan->pattern_min_len >
904                                 rdev->wiphy.wowlan->pattern_max_len)))
905                 return -EINVAL;
906 #endif
907 
908         /* check and set up bitrates */
909         ieee80211_set_bitrate_flags(wiphy);
910 
911         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
912 
913         rtnl_lock();
914         res = device_add(&rdev->wiphy.dev);
915         if (res) {
916                 rtnl_unlock();
917                 return res;
918         }
919 
920         /* set up regulatory info */
921         wiphy_regulatory_register(wiphy);
922 
923         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
924         cfg80211_rdev_list_generation++;
925 
926         /* add to debugfs */
927         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
928                                                     ieee80211_debugfs_dir);
929 
930         cfg80211_debugfs_rdev_add(rdev);
931         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
932 
933         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
934                 struct regulatory_request request;
935 
936                 request.wiphy_idx = get_wiphy_idx(wiphy);
937                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
938                 request.alpha2[0] = '9';
939                 request.alpha2[1] = '9';
940 
941                 nl80211_send_reg_change_event(&request);
942         }
943 
944         /* Check that nobody globally advertises any capabilities they do not
945          * advertise on all possible interface types.
946          */
947         if (wiphy->extended_capabilities_len &&
948             wiphy->num_iftype_ext_capab &&
949             wiphy->iftype_ext_capab) {
950                 u8 supported_on_all, j;
951                 const struct wiphy_iftype_ext_capab *capab;
952 
953                 capab = wiphy->iftype_ext_capab;
954                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
955                         if (capab[0].extended_capabilities_len > j)
956                                 supported_on_all =
957                                         capab[0].extended_capabilities[j];
958                         else
959                                 supported_on_all = 0x00;
960                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
961                                 if (j >= capab[i].extended_capabilities_len) {
962                                         supported_on_all = 0x00;
963                                         break;
964                                 }
965                                 supported_on_all &=
966                                         capab[i].extended_capabilities[j];
967                         }
968                         if (WARN_ON(wiphy->extended_capabilities[j] &
969                                     ~supported_on_all))
970                                 break;
971                 }
972         }
973 
974         rdev->wiphy.registered = true;
975         rtnl_unlock();
976 
977         res = rfkill_register(rdev->rfkill);
978         if (res) {
979                 rfkill_destroy(rdev->rfkill);
980                 rdev->rfkill = NULL;
981                 wiphy_unregister(&rdev->wiphy);
982                 return res;
983         }
984 
985         return 0;
986 }
987 EXPORT_SYMBOL(wiphy_register);
988 
989 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
990 {
991         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
992 
993         if (!rdev->ops->rfkill_poll)
994                 return;
995         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
996         rfkill_resume_polling(rdev->rfkill);
997 }
998 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
999 
1000 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
1001 {
1002         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1003 
1004         rfkill_pause_polling(rdev->rfkill);
1005 }
1006 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
1007 
1008 void wiphy_unregister(struct wiphy *wiphy)
1009 {
1010         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1011 
1012         wait_event(rdev->dev_wait, ({
1013                 int __count;
1014                 rtnl_lock();
1015                 __count = rdev->opencount;
1016                 rtnl_unlock();
1017                 __count == 0; }));
1018 
1019         if (rdev->rfkill)
1020                 rfkill_unregister(rdev->rfkill);
1021 
1022         rtnl_lock();
1023         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1024         rdev->wiphy.registered = false;
1025 
1026         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1027 
1028         /*
1029          * First remove the hardware from everywhere, this makes
1030          * it impossible to find from userspace.
1031          */
1032         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1033         list_del_rcu(&rdev->list);
1034         synchronize_rcu();
1035 
1036         /*
1037          * If this device got a regulatory hint tell core its
1038          * free to listen now to a new shiny device regulatory hint
1039          */
1040         wiphy_regulatory_deregister(wiphy);
1041 
1042         cfg80211_rdev_list_generation++;
1043         device_del(&rdev->wiphy.dev);
1044 
1045         rtnl_unlock();
1046 
1047         flush_work(&rdev->scan_done_wk);
1048         cancel_work_sync(&rdev->conn_work);
1049         flush_work(&rdev->event_work);
1050         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1051         flush_work(&rdev->destroy_work);
1052         flush_work(&rdev->sched_scan_stop_wk);
1053         flush_work(&rdev->propagate_radar_detect_wk);
1054         flush_work(&rdev->propagate_cac_done_wk);
1055         flush_work(&rdev->mgmt_registrations_update_wk);
1056 
1057 #ifdef CONFIG_PM
1058         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1059                 rdev_set_wakeup(rdev, false);
1060 #endif
1061         cfg80211_rdev_free_wowlan(rdev);
1062         cfg80211_rdev_free_coalesce(rdev);
1063 }
1064 EXPORT_SYMBOL(wiphy_unregister);
1065 
1066 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1067 {
1068         struct cfg80211_internal_bss *scan, *tmp;
1069         struct cfg80211_beacon_registration *reg, *treg;
1070         rfkill_destroy(rdev->rfkill);
1071         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1072                 list_del(&reg->list);
1073                 kfree(reg);
1074         }
1075         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1076                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1077         kfree(rdev);
1078 }
1079 
1080 void wiphy_free(struct wiphy *wiphy)
1081 {
1082         put_device(&wiphy->dev);
1083 }
1084 EXPORT_SYMBOL(wiphy_free);
1085 
1086 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1087 {
1088         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1089 
1090         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1091                 schedule_work(&rdev->rfkill_block);
1092 }
1093 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1094 
1095 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1096 {
1097         kfree(wdev->cqm_config);
1098         wdev->cqm_config = NULL;
1099 }
1100 
1101 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1102 {
1103         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1104 
1105         ASSERT_RTNL();
1106 
1107         flush_work(&wdev->pmsr_free_wk);
1108 
1109         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1110 
1111         list_del_rcu(&wdev->list);
1112         if (sync)
1113                 synchronize_rcu();
1114         rdev->devlist_generation++;
1115 
1116         cfg80211_mlme_purge_registrations(wdev);
1117 
1118         switch (wdev->iftype) {
1119         case NL80211_IFTYPE_P2P_DEVICE:
1120                 cfg80211_stop_p2p_device(rdev, wdev);
1121                 break;
1122         case NL80211_IFTYPE_NAN:
1123                 cfg80211_stop_nan(rdev, wdev);
1124                 break;
1125         default:
1126                 break;
1127         }
1128 
1129 #ifdef CONFIG_CFG80211_WEXT
1130         kfree_sensitive(wdev->wext.keys);
1131         wdev->wext.keys = NULL;
1132 #endif
1133         /* only initialized if we have a netdev */
1134         if (wdev->netdev)
1135                 flush_work(&wdev->disconnect_wk);
1136 
1137         cfg80211_cqm_config_free(wdev);
1138 }
1139 
1140 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1141 {
1142         if (WARN_ON(wdev->netdev))
1143                 return;
1144 
1145         __cfg80211_unregister_wdev(wdev, true);
1146 }
1147 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1148 
1149 static const struct device_type wiphy_type = {
1150         .name   = "wlan",
1151 };
1152 
1153 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1154                                enum nl80211_iftype iftype, int num)
1155 {
1156         ASSERT_RTNL();
1157 
1158         rdev->num_running_ifaces += num;
1159         if (iftype == NL80211_IFTYPE_MONITOR)
1160                 rdev->num_running_monitor_ifaces += num;
1161 }
1162 
1163 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1164                       struct wireless_dev *wdev)
1165 {
1166         struct net_device *dev = wdev->netdev;
1167         struct cfg80211_sched_scan_request *pos, *tmp;
1168 
1169         ASSERT_RTNL();
1170         ASSERT_WDEV_LOCK(wdev);
1171 
1172         cfg80211_pmsr_wdev_down(wdev);
1173 
1174         switch (wdev->iftype) {
1175         case NL80211_IFTYPE_ADHOC:
1176                 __cfg80211_leave_ibss(rdev, dev, true);
1177                 break;
1178         case NL80211_IFTYPE_P2P_CLIENT:
1179         case NL80211_IFTYPE_STATION:
1180                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1181                                          list) {
1182                         if (dev == pos->dev)
1183                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1184                 }
1185 
1186 #ifdef CONFIG_CFG80211_WEXT
1187                 kfree(wdev->wext.ie);
1188                 wdev->wext.ie = NULL;
1189                 wdev->wext.ie_len = 0;
1190                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1191 #endif
1192                 cfg80211_disconnect(rdev, dev,
1193                                     WLAN_REASON_DEAUTH_LEAVING, true);
1194                 break;
1195         case NL80211_IFTYPE_MESH_POINT:
1196                 __cfg80211_leave_mesh(rdev, dev);
1197                 break;
1198         case NL80211_IFTYPE_AP:
1199         case NL80211_IFTYPE_P2P_GO:
1200                 __cfg80211_stop_ap(rdev, dev, true);
1201                 break;
1202         case NL80211_IFTYPE_OCB:
1203                 __cfg80211_leave_ocb(rdev, dev);
1204                 break;
1205         case NL80211_IFTYPE_WDS:
1206                 /* must be handled by mac80211/driver, has no APIs */
1207                 break;
1208         case NL80211_IFTYPE_P2P_DEVICE:
1209         case NL80211_IFTYPE_NAN:
1210                 /* cannot happen, has no netdev */
1211                 break;
1212         case NL80211_IFTYPE_AP_VLAN:
1213         case NL80211_IFTYPE_MONITOR:
1214                 /* nothing to do */
1215                 break;
1216         case NL80211_IFTYPE_UNSPECIFIED:
1217         case NUM_NL80211_IFTYPES:
1218                 /* invalid */
1219                 break;
1220         }
1221 }
1222 
1223 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1224                     struct wireless_dev *wdev)
1225 {
1226         wdev_lock(wdev);
1227         __cfg80211_leave(rdev, wdev);
1228         wdev_unlock(wdev);
1229 }
1230 
1231 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1232                          gfp_t gfp)
1233 {
1234         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1235         struct cfg80211_event *ev;
1236         unsigned long flags;
1237 
1238         trace_cfg80211_stop_iface(wiphy, wdev);
1239 
1240         ev = kzalloc(sizeof(*ev), gfp);
1241         if (!ev)
1242                 return;
1243 
1244         ev->type = EVENT_STOPPED;
1245 
1246         spin_lock_irqsave(&wdev->event_lock, flags);
1247         list_add_tail(&ev->list, &wdev->event_list);
1248         spin_unlock_irqrestore(&wdev->event_lock, flags);
1249         queue_work(cfg80211_wq, &rdev->event_work);
1250 }
1251 EXPORT_SYMBOL(cfg80211_stop_iface);
1252 
1253 void cfg80211_init_wdev(struct wireless_dev *wdev)
1254 {
1255         mutex_init(&wdev->mtx);
1256         INIT_LIST_HEAD(&wdev->event_list);
1257         spin_lock_init(&wdev->event_lock);
1258         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1259         spin_lock_init(&wdev->mgmt_registrations_lock);
1260         INIT_LIST_HEAD(&wdev->pmsr_list);
1261         spin_lock_init(&wdev->pmsr_lock);
1262         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1263 
1264 #ifdef CONFIG_CFG80211_WEXT
1265         wdev->wext.default_key = -1;
1266         wdev->wext.default_mgmt_key = -1;
1267         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1268 #endif
1269 
1270         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1271                 wdev->ps = true;
1272         else
1273                 wdev->ps = false;
1274         /* allow mac80211 to determine the timeout */
1275         wdev->ps_timeout = -1;
1276 
1277         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1278              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1279              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1280                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1281 
1282         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1283 }
1284 
1285 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1286                             struct wireless_dev *wdev)
1287 {
1288         /*
1289          * We get here also when the interface changes network namespaces,
1290          * as it's registered into the new one, but we don't want it to
1291          * change ID in that case. Checking if the ID is already assigned
1292          * works, because 0 isn't considered a valid ID and the memory is
1293          * 0-initialized.
1294          */
1295         if (!wdev->identifier)
1296                 wdev->identifier = ++rdev->wdev_id;
1297         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1298         rdev->devlist_generation++;
1299 
1300         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1301 }
1302 
1303 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1304                                          unsigned long state, void *ptr)
1305 {
1306         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1307         struct wireless_dev *wdev = dev->ieee80211_ptr;
1308         struct cfg80211_registered_device *rdev;
1309         struct cfg80211_sched_scan_request *pos, *tmp;
1310 
1311         if (!wdev)
1312                 return NOTIFY_DONE;
1313 
1314         rdev = wiphy_to_rdev(wdev->wiphy);
1315 
1316         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1317 
1318         switch (state) {
1319         case NETDEV_POST_INIT:
1320                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1321                 wdev->netdev = dev;
1322                 /* can only change netns with wiphy */
1323                 dev->features |= NETIF_F_NETNS_LOCAL;
1324 
1325                 cfg80211_init_wdev(wdev);
1326                 break;
1327         case NETDEV_REGISTER:
1328                 /*
1329                  * NB: cannot take rdev->mtx here because this may be
1330                  * called within code protected by it when interfaces
1331                  * are added with nl80211.
1332                  */
1333                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1334                                       "phy80211")) {
1335                         pr_err("failed to add phy80211 symlink to netdev!\n");
1336                 }
1337 
1338                 cfg80211_register_wdev(rdev, wdev);
1339                 break;
1340         case NETDEV_GOING_DOWN:
1341                 cfg80211_leave(rdev, wdev);
1342                 break;
1343         case NETDEV_DOWN:
1344                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1345                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1346                         if (WARN_ON(!rdev->scan_req->notified &&
1347                                     (!rdev->int_scan_req ||
1348                                      !rdev->int_scan_req->notified)))
1349                                 rdev->scan_req->info.aborted = true;
1350                         ___cfg80211_scan_done(rdev, false);
1351                 }
1352 
1353                 list_for_each_entry_safe(pos, tmp,
1354                                          &rdev->sched_scan_req_list, list) {
1355                         if (WARN_ON(pos->dev == wdev->netdev))
1356                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1357                 }
1358 
1359                 rdev->opencount--;
1360                 wake_up(&rdev->dev_wait);
1361                 break;
1362         case NETDEV_UP:
1363                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1364                 wdev_lock(wdev);
1365                 switch (wdev->iftype) {
1366 #ifdef CONFIG_CFG80211_WEXT
1367                 case NL80211_IFTYPE_ADHOC:
1368                         cfg80211_ibss_wext_join(rdev, wdev);
1369                         break;
1370                 case NL80211_IFTYPE_STATION:
1371                         cfg80211_mgd_wext_connect(rdev, wdev);
1372                         break;
1373 #endif
1374 #ifdef CONFIG_MAC80211_MESH
1375                 case NL80211_IFTYPE_MESH_POINT:
1376                         {
1377                                 /* backward compat code... */
1378                                 struct mesh_setup setup;
1379                                 memcpy(&setup, &default_mesh_setup,
1380                                                 sizeof(setup));
1381                                  /* back compat only needed for mesh_id */
1382                                 setup.mesh_id = wdev->ssid;
1383                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1384                                 if (wdev->mesh_id_up_len)
1385                                         __cfg80211_join_mesh(rdev, dev,
1386                                                         &setup,
1387                                                         &default_mesh_config);
1388                                 break;
1389                         }
1390 #endif
1391                 default:
1392                         break;
1393                 }
1394                 wdev_unlock(wdev);
1395                 rdev->opencount++;
1396 
1397                 /*
1398                  * Configure power management to the driver here so that its
1399                  * correctly set also after interface type changes etc.
1400                  */
1401                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1402                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1403                     rdev->ops->set_power_mgmt &&
1404                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1405                                         wdev->ps_timeout)) {
1406                         /* assume this means it's off */
1407                         wdev->ps = false;
1408                 }
1409                 break;
1410         case NETDEV_UNREGISTER:
1411                 /*
1412                  * It is possible to get NETDEV_UNREGISTER
1413                  * multiple times. To detect that, check
1414                  * that the interface is still on the list
1415                  * of registered interfaces, and only then
1416                  * remove and clean it up.
1417                  */
1418                 if (!list_empty(&wdev->list)) {
1419                         __cfg80211_unregister_wdev(wdev, false);
1420                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1421                 }
1422                 /*
1423                  * synchronise (so that we won't find this netdev
1424                  * from other code any more) and then clear the list
1425                  * head so that the above code can safely check for
1426                  * !list_empty() to avoid double-cleanup.
1427                  */
1428                 synchronize_rcu();
1429                 INIT_LIST_HEAD(&wdev->list);
1430                 /*
1431                  * Ensure that all events have been processed and
1432                  * freed.
1433                  */
1434                 cfg80211_process_wdev_events(wdev);
1435 
1436                 if (WARN_ON(wdev->current_bss)) {
1437                         cfg80211_unhold_bss(wdev->current_bss);
1438                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1439                         wdev->current_bss = NULL;
1440                 }
1441                 break;
1442         case NETDEV_PRE_UP:
1443                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1444                                              wdev->use_4addr, 0))
1445                         return notifier_from_errno(-EOPNOTSUPP);
1446 
1447                 if (rfkill_blocked(rdev->rfkill))
1448                         return notifier_from_errno(-ERFKILL);
1449                 break;
1450         default:
1451                 return NOTIFY_DONE;
1452         }
1453 
1454         wireless_nlevent_flush();
1455 
1456         return NOTIFY_OK;
1457 }
1458 
1459 static struct notifier_block cfg80211_netdev_notifier = {
1460         .notifier_call = cfg80211_netdev_notifier_call,
1461 };
1462 
1463 static void __net_exit cfg80211_pernet_exit(struct net *net)
1464 {
1465         struct cfg80211_registered_device *rdev;
1466 
1467         rtnl_lock();
1468         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1469                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1470                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1471         }
1472         rtnl_unlock();
1473 }
1474 
1475 static struct pernet_operations cfg80211_pernet_ops = {
1476         .exit = cfg80211_pernet_exit,
1477 };
1478 
1479 static int __init cfg80211_init(void)
1480 {
1481         int err;
1482 
1483         err = register_pernet_device(&cfg80211_pernet_ops);
1484         if (err)
1485                 goto out_fail_pernet;
1486 
1487         err = wiphy_sysfs_init();
1488         if (err)
1489                 goto out_fail_sysfs;
1490 
1491         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1492         if (err)
1493                 goto out_fail_notifier;
1494 
1495         err = nl80211_init();
1496         if (err)
1497                 goto out_fail_nl80211;
1498 
1499         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1500 
1501         err = regulatory_init();
1502         if (err)
1503                 goto out_fail_reg;
1504 
1505         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1506         if (!cfg80211_wq) {
1507                 err = -ENOMEM;
1508                 goto out_fail_wq;
1509         }
1510 
1511         return 0;
1512 
1513 out_fail_wq:
1514         regulatory_exit();
1515 out_fail_reg:
1516         debugfs_remove(ieee80211_debugfs_dir);
1517         nl80211_exit();
1518 out_fail_nl80211:
1519         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1520 out_fail_notifier:
1521         wiphy_sysfs_exit();
1522 out_fail_sysfs:
1523         unregister_pernet_device(&cfg80211_pernet_ops);
1524 out_fail_pernet:
1525         return err;
1526 }
1527 fs_initcall(cfg80211_init);
1528 
1529 static void __exit cfg80211_exit(void)
1530 {
1531         debugfs_remove(ieee80211_debugfs_dir);
1532         nl80211_exit();
1533         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1534         wiphy_sysfs_exit();
1535         regulatory_exit();
1536         unregister_pernet_device(&cfg80211_pernet_ops);
1537         destroy_workqueue(cfg80211_wq);
1538 }
1539 module_exit(cfg80211_exit);
1540 

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