2 * This is the linux wireless configuration interface.
4 * Copyright 2006-2009 Johannes Berg <johannes@sipsolutions.net>
8 #include <linux/module.h>
10 #include <linux/list.h>
11 #include <linux/nl80211.h>
12 #include <linux/debugfs.h>
13 #include <linux/notifier.h>
14 #include <linux/device.h>
15 #include <linux/etherdevice.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/sched.h>
18 #include <net/genetlink.h>
19 #include <net/cfg80211.h>
24 #include "wext-compat.h"
27 /* name for sysfs, %d is appended */
28 #define PHY_NAME "phy"
30 MODULE_AUTHOR("Johannes Berg");
31 MODULE_LICENSE("GPL");
32 MODULE_DESCRIPTION("wireless configuration support");
34 /* RCU might be appropriate here since we usually
35 * only read the list, and that can happen quite
36 * often because we need to do it for each command */
37 LIST_HEAD(cfg80211_rdev_list);
38 int cfg80211_rdev_list_generation;
41 * This is used to protect the cfg80211_rdev_list
43 DEFINE_MUTEX(cfg80211_mutex);
46 static struct dentry *ieee80211_debugfs_dir;
48 /* requires cfg80211_mutex to be held! */
49 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
51 struct cfg80211_registered_device *result = NULL, *rdev;
53 if (!wiphy_idx_valid(wiphy_idx))
56 assert_cfg80211_lock();
58 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
59 if (rdev->wiphy_idx == wiphy_idx) {
68 int get_wiphy_idx(struct wiphy *wiphy)
70 struct cfg80211_registered_device *rdev;
72 return WIPHY_IDX_STALE;
73 rdev = wiphy_to_dev(wiphy);
74 return rdev->wiphy_idx;
77 /* requires cfg80211_rdev_mutex to be held! */
78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
80 struct cfg80211_registered_device *rdev;
82 if (!wiphy_idx_valid(wiphy_idx))
85 assert_cfg80211_lock();
87 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
93 /* requires cfg80211_mutex to be held! */
94 struct cfg80211_registered_device *
95 __cfg80211_rdev_from_info(struct genl_info *info)
98 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
99 struct net_device *dev;
102 assert_cfg80211_lock();
104 if (info->attrs[NL80211_ATTR_WIPHY]) {
105 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
106 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
110 if (info->attrs[NL80211_ATTR_IFINDEX]) {
111 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
112 dev = dev_get_by_index(genl_info_net(info), ifindex);
114 if (dev->ieee80211_ptr)
116 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
122 if (bywiphyidx && byifidx) {
123 if (bywiphyidx != byifidx)
124 return ERR_PTR(-EINVAL);
126 return bywiphyidx; /* == byifidx */
137 struct cfg80211_registered_device *
138 cfg80211_get_dev_from_info(struct genl_info *info)
140 struct cfg80211_registered_device *rdev;
142 mutex_lock(&cfg80211_mutex);
143 rdev = __cfg80211_rdev_from_info(info);
145 /* if it is not an error we grab the lock on
146 * it to assure it won't be going away while
147 * we operate on it */
149 mutex_lock(&rdev->mtx);
151 mutex_unlock(&cfg80211_mutex);
156 struct cfg80211_registered_device *
157 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
159 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
160 struct net_device *dev;
162 mutex_lock(&cfg80211_mutex);
163 dev = dev_get_by_index(net, ifindex);
166 if (dev->ieee80211_ptr) {
167 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
168 mutex_lock(&rdev->mtx);
170 rdev = ERR_PTR(-ENODEV);
173 mutex_unlock(&cfg80211_mutex);
177 /* requires cfg80211_mutex to be held */
178 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
181 struct cfg80211_registered_device *rdev2;
182 int wiphy_idx, taken = -1, result, digits;
184 assert_cfg80211_lock();
186 /* prohibit calling the thing phy%d when %d is not its number */
187 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
188 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
189 /* count number of places needed to print wiphy_idx */
191 while (wiphy_idx /= 10)
194 * deny the name if it is phy<idx> where <idx> is printed
195 * without leading zeroes. taken == strlen(newname) here
197 if (taken == strlen(PHY_NAME) + digits)
202 /* Ignore nop renames */
203 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
206 /* Ensure another device does not already have this name. */
207 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
208 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
211 result = device_rename(&rdev->wiphy.dev, newname);
215 if (rdev->wiphy.debugfsdir &&
216 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
217 rdev->wiphy.debugfsdir,
218 rdev->wiphy.debugfsdir->d_parent,
220 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
223 nl80211_notify_dev_rename(rdev);
228 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
231 struct wireless_dev *wdev;
234 if (!rdev->wiphy.netnsok)
237 list_for_each_entry(wdev, &rdev->netdev_list, list) {
238 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
239 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
242 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
246 /* failed -- clean up to old netns */
247 net = wiphy_net(&rdev->wiphy);
249 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
251 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
252 err = dev_change_net_namespace(wdev->netdev, net,
255 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
259 wiphy_net_set(&rdev->wiphy, net);
264 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
266 struct cfg80211_registered_device *rdev = data;
268 rdev->ops->rfkill_poll(&rdev->wiphy);
271 static int cfg80211_rfkill_set_block(void *data, bool blocked)
273 struct cfg80211_registered_device *rdev = data;
274 struct wireless_dev *wdev;
280 mutex_lock(&rdev->devlist_mtx);
282 list_for_each_entry(wdev, &rdev->netdev_list, list)
283 dev_close(wdev->netdev);
285 mutex_unlock(&rdev->devlist_mtx);
291 static void cfg80211_rfkill_sync_work(struct work_struct *work)
293 struct cfg80211_registered_device *rdev;
295 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
296 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
299 static void cfg80211_event_work(struct work_struct *work)
301 struct cfg80211_registered_device *rdev;
303 rdev = container_of(work, struct cfg80211_registered_device,
307 cfg80211_lock_rdev(rdev);
309 cfg80211_process_rdev_events(rdev);
310 cfg80211_unlock_rdev(rdev);
314 /* exported functions */
316 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
318 static int wiphy_counter;
320 struct cfg80211_registered_device *rdev;
323 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
324 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
325 WARN_ON(ops->connect && !ops->disconnect);
326 WARN_ON(ops->join_ibss && !ops->leave_ibss);
327 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
328 WARN_ON(ops->add_station && !ops->del_station);
329 WARN_ON(ops->add_mpath && !ops->del_mpath);
331 alloc_size = sizeof(*rdev) + sizeof_priv;
333 rdev = kzalloc(alloc_size, GFP_KERNEL);
339 mutex_lock(&cfg80211_mutex);
341 rdev->wiphy_idx = wiphy_counter++;
343 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
345 mutex_unlock(&cfg80211_mutex);
351 mutex_unlock(&cfg80211_mutex);
353 /* give it a proper name */
354 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
356 mutex_init(&rdev->mtx);
357 mutex_init(&rdev->devlist_mtx);
358 INIT_LIST_HEAD(&rdev->netdev_list);
359 spin_lock_init(&rdev->bss_lock);
360 INIT_LIST_HEAD(&rdev->bss_list);
361 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
363 #ifdef CONFIG_CFG80211_WEXT
364 rdev->wiphy.wext = &cfg80211_wext_handler;
367 device_initialize(&rdev->wiphy.dev);
368 rdev->wiphy.dev.class = &ieee80211_class;
369 rdev->wiphy.dev.platform_data = rdev;
371 rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
373 wiphy_net_set(&rdev->wiphy, &init_net);
375 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
376 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
377 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
378 &rdev->rfkill_ops, rdev);
385 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
386 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
387 INIT_WORK(&rdev->event_work, cfg80211_event_work);
389 init_waitqueue_head(&rdev->dev_wait);
392 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
393 * Fragmentation and RTS threshold are disabled by default with the
396 rdev->wiphy.retry_short = 7;
397 rdev->wiphy.retry_long = 4;
398 rdev->wiphy.frag_threshold = (u32) -1;
399 rdev->wiphy.rts_threshold = (u32) -1;
403 EXPORT_SYMBOL(wiphy_new);
405 int wiphy_register(struct wiphy *wiphy)
407 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
409 enum ieee80211_band band;
410 struct ieee80211_supported_band *sband;
411 bool have_band = false;
413 u16 ifmodes = wiphy->interface_modes;
415 /* sanity check ifmodes */
417 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
418 if (WARN_ON(ifmodes != wiphy->interface_modes))
419 wiphy->interface_modes = ifmodes;
421 /* sanity check supported bands/channels */
422 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
423 sband = wiphy->bands[band];
429 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
433 * Since we use a u32 for rate bitmaps in
434 * ieee80211_get_response_rate, we cannot
435 * have more than 32 legacy rates.
437 if (WARN_ON(sband->n_bitrates > 32))
440 for (i = 0; i < sband->n_channels; i++) {
441 sband->channels[i].orig_flags =
442 sband->channels[i].flags;
443 sband->channels[i].orig_mag =
444 sband->channels[i].max_antenna_gain;
445 sband->channels[i].orig_mpwr =
446 sband->channels[i].max_power;
447 sband->channels[i].band = band;
458 /* check and set up bitrates */
459 ieee80211_set_bitrate_flags(wiphy);
461 res = device_add(&rdev->wiphy.dev);
465 res = rfkill_register(rdev->rfkill);
469 mutex_lock(&cfg80211_mutex);
471 /* set up regulatory info */
472 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
474 list_add(&rdev->list, &cfg80211_rdev_list);
475 cfg80211_rdev_list_generation++;
477 mutex_unlock(&cfg80211_mutex);
480 rdev->wiphy.debugfsdir =
481 debugfs_create_dir(wiphy_name(&rdev->wiphy),
482 ieee80211_debugfs_dir);
483 if (IS_ERR(rdev->wiphy.debugfsdir))
484 rdev->wiphy.debugfsdir = NULL;
486 if (wiphy->custom_regulatory) {
487 struct regulatory_request request;
489 request.wiphy_idx = get_wiphy_idx(wiphy);
490 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
491 request.alpha2[0] = '9';
492 request.alpha2[1] = '9';
494 nl80211_send_reg_change_event(&request);
497 cfg80211_debugfs_rdev_add(rdev);
502 device_del(&rdev->wiphy.dev);
505 EXPORT_SYMBOL(wiphy_register);
507 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
509 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
511 if (!rdev->ops->rfkill_poll)
513 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
514 rfkill_resume_polling(rdev->rfkill);
516 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
518 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
520 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
522 rfkill_pause_polling(rdev->rfkill);
524 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
526 void wiphy_unregister(struct wiphy *wiphy)
528 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
530 rfkill_unregister(rdev->rfkill);
532 /* protect the device list */
533 mutex_lock(&cfg80211_mutex);
535 wait_event(rdev->dev_wait, ({
537 mutex_lock(&rdev->devlist_mtx);
538 __count = rdev->opencount;
539 mutex_unlock(&rdev->devlist_mtx);
542 mutex_lock(&rdev->devlist_mtx);
543 BUG_ON(!list_empty(&rdev->netdev_list));
544 mutex_unlock(&rdev->devlist_mtx);
547 * First remove the hardware from everywhere, this makes
548 * it impossible to find from userspace.
550 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
551 list_del(&rdev->list);
554 * Try to grab rdev->mtx. If a command is still in progress,
555 * hopefully the driver will refuse it since it's tearing
556 * down the device already. We wait for this command to complete
557 * before unlinking the item from the list.
558 * Note: as codified by the BUG_ON above we cannot get here if
559 * a virtual interface is still present. Hence, we can only get
560 * to lock contention here if userspace issues a command that
561 * identified the hardware by wiphy index.
563 cfg80211_lock_rdev(rdev);
565 cfg80211_unlock_rdev(rdev);
567 /* If this device got a regulatory hint tell core its
568 * free to listen now to a new shiny device regulatory hint */
569 reg_device_remove(wiphy);
571 cfg80211_rdev_list_generation++;
572 device_del(&rdev->wiphy.dev);
574 mutex_unlock(&cfg80211_mutex);
576 flush_work(&rdev->scan_done_wk);
577 cancel_work_sync(&rdev->conn_work);
578 flush_work(&rdev->event_work);
580 EXPORT_SYMBOL(wiphy_unregister);
582 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
584 struct cfg80211_internal_bss *scan, *tmp;
585 rfkill_destroy(rdev->rfkill);
586 mutex_destroy(&rdev->mtx);
587 mutex_destroy(&rdev->devlist_mtx);
588 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
589 cfg80211_put_bss(&scan->pub);
593 void wiphy_free(struct wiphy *wiphy)
595 put_device(&wiphy->dev);
597 EXPORT_SYMBOL(wiphy_free);
599 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
601 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
603 if (rfkill_set_hw_state(rdev->rfkill, blocked))
604 schedule_work(&rdev->rfkill_sync);
606 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
608 static void wdev_cleanup_work(struct work_struct *work)
610 struct wireless_dev *wdev;
611 struct cfg80211_registered_device *rdev;
613 wdev = container_of(work, struct wireless_dev, cleanup_work);
614 rdev = wiphy_to_dev(wdev->wiphy);
616 cfg80211_lock_rdev(rdev);
618 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
619 rdev->scan_req->aborted = true;
620 ___cfg80211_scan_done(rdev, true);
623 cfg80211_unlock_rdev(rdev);
625 mutex_lock(&rdev->devlist_mtx);
627 mutex_unlock(&rdev->devlist_mtx);
628 wake_up(&rdev->dev_wait);
630 dev_put(wdev->netdev);
633 static struct device_type wiphy_type = {
637 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
641 struct net_device *dev = ndev;
642 struct wireless_dev *wdev = dev->ieee80211_ptr;
643 struct cfg80211_registered_device *rdev;
648 rdev = wiphy_to_dev(wdev->wiphy);
650 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
653 case NETDEV_POST_INIT:
654 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
656 case NETDEV_REGISTER:
658 * NB: cannot take rdev->mtx here because this may be
659 * called within code protected by it when interfaces
660 * are added with nl80211.
662 mutex_init(&wdev->mtx);
663 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
664 INIT_LIST_HEAD(&wdev->event_list);
665 spin_lock_init(&wdev->event_lock);
666 mutex_lock(&rdev->devlist_mtx);
667 list_add(&wdev->list, &rdev->netdev_list);
668 rdev->devlist_generation++;
669 /* can only change netns with wiphy */
670 dev->features |= NETIF_F_NETNS_LOCAL;
672 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
674 printk(KERN_ERR "wireless: failed to add phy80211 "
675 "symlink to netdev!\n");
678 wdev->sme_state = CFG80211_SME_IDLE;
679 mutex_unlock(&rdev->devlist_mtx);
680 #ifdef CONFIG_CFG80211_WEXT
681 wdev->wext.default_key = -1;
682 wdev->wext.default_mgmt_key = -1;
683 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
684 wdev->wext.ps = wdev->wiphy->ps_default;
685 wdev->wext.ps_timeout = 100;
686 if (rdev->ops->set_power_mgmt)
687 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
689 wdev->wext.ps_timeout)) {
690 /* assume this means it's off */
691 wdev->wext.ps = false;
694 if (!dev->ethtool_ops)
695 dev->ethtool_ops = &cfg80211_ethtool_ops;
697 case NETDEV_GOING_DOWN:
698 switch (wdev->iftype) {
699 case NL80211_IFTYPE_ADHOC:
700 cfg80211_leave_ibss(rdev, dev, true);
702 case NL80211_IFTYPE_STATION:
704 #ifdef CONFIG_CFG80211_WEXT
705 kfree(wdev->wext.ie);
706 wdev->wext.ie = NULL;
707 wdev->wext.ie_len = 0;
708 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
710 __cfg80211_disconnect(rdev, dev,
711 WLAN_REASON_DEAUTH_LEAVING, true);
712 cfg80211_mlme_down(rdev, dev);
721 schedule_work(&wdev->cleanup_work);
725 * If we have a really quick DOWN/UP succession we may
726 * have this work still pending ... cancel it and see
727 * if it was pending, in which case we need to account
728 * for some of the work it would have done.
730 if (cancel_work_sync(&wdev->cleanup_work)) {
731 mutex_lock(&rdev->devlist_mtx);
733 mutex_unlock(&rdev->devlist_mtx);
736 #ifdef CONFIG_CFG80211_WEXT
737 cfg80211_lock_rdev(rdev);
738 mutex_lock(&rdev->devlist_mtx);
740 switch (wdev->iftype) {
741 case NL80211_IFTYPE_ADHOC:
742 cfg80211_ibss_wext_join(rdev, wdev);
744 case NL80211_IFTYPE_STATION:
745 cfg80211_mgd_wext_connect(rdev, wdev);
752 mutex_unlock(&rdev->devlist_mtx);
753 cfg80211_unlock_rdev(rdev);
756 case NETDEV_UNREGISTER:
758 * NB: cannot take rdev->mtx here because this may be
759 * called within code protected by it when interfaces
760 * are removed with nl80211.
762 mutex_lock(&rdev->devlist_mtx);
764 * It is possible to get NETDEV_UNREGISTER
765 * multiple times. To detect that, check
766 * that the interface is still on the list
767 * of registered interfaces, and only then
768 * remove and clean it up.
770 if (!list_empty(&wdev->list)) {
771 sysfs_remove_link(&dev->dev.kobj, "phy80211");
772 list_del_init(&wdev->list);
773 rdev->devlist_generation++;
774 #ifdef CONFIG_CFG80211_WEXT
775 kfree(wdev->wext.keys);
778 mutex_unlock(&rdev->devlist_mtx);
781 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
782 return notifier_from_errno(-EOPNOTSUPP);
783 if (rfkill_blocked(rdev->rfkill))
784 return notifier_from_errno(-ERFKILL);
791 static struct notifier_block cfg80211_netdev_notifier = {
792 .notifier_call = cfg80211_netdev_notifier_call,
795 static void __net_exit cfg80211_pernet_exit(struct net *net)
797 struct cfg80211_registered_device *rdev;
800 mutex_lock(&cfg80211_mutex);
801 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
802 if (net_eq(wiphy_net(&rdev->wiphy), net))
803 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
805 mutex_unlock(&cfg80211_mutex);
809 static struct pernet_operations cfg80211_pernet_ops = {
810 .exit = cfg80211_pernet_exit,
813 static int __init cfg80211_init(void)
817 err = register_pernet_device(&cfg80211_pernet_ops);
819 goto out_fail_pernet;
821 err = wiphy_sysfs_init();
825 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
827 goto out_fail_notifier;
829 err = nl80211_init();
831 goto out_fail_nl80211;
833 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
835 err = regulatory_init();
842 debugfs_remove(ieee80211_debugfs_dir);
844 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
848 unregister_pernet_device(&cfg80211_pernet_ops);
852 subsys_initcall(cfg80211_init);
854 static void cfg80211_exit(void)
856 debugfs_remove(ieee80211_debugfs_dir);
858 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
861 unregister_pernet_device(&cfg80211_pernet_ops);
863 module_exit(cfg80211_exit);