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 <net/genetlink.h>
18 #include <net/cfg80211.h>
23 #include "wext-compat.h"
25 /* name for sysfs, %d is appended */
26 #define PHY_NAME "phy"
28 MODULE_AUTHOR("Johannes Berg");
29 MODULE_LICENSE("GPL");
30 MODULE_DESCRIPTION("wireless configuration support");
32 /* RCU might be appropriate here since we usually
33 * only read the list, and that can happen quite
34 * often because we need to do it for each command */
35 LIST_HEAD(cfg80211_rdev_list);
36 int cfg80211_rdev_list_generation;
39 * This is used to protect the cfg80211_rdev_list
41 DEFINE_MUTEX(cfg80211_mutex);
44 static struct dentry *ieee80211_debugfs_dir;
46 /* requires cfg80211_mutex to be held! */
47 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
49 struct cfg80211_registered_device *result = NULL, *rdev;
51 if (!wiphy_idx_valid(wiphy_idx))
54 assert_cfg80211_lock();
56 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
57 if (rdev->wiphy_idx == wiphy_idx) {
66 int get_wiphy_idx(struct wiphy *wiphy)
68 struct cfg80211_registered_device *rdev;
70 return WIPHY_IDX_STALE;
71 rdev = wiphy_to_dev(wiphy);
72 return rdev->wiphy_idx;
75 /* requires cfg80211_rdev_mutex to be held! */
76 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
78 struct cfg80211_registered_device *rdev;
80 if (!wiphy_idx_valid(wiphy_idx))
83 assert_cfg80211_lock();
85 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
91 /* requires cfg80211_mutex to be held! */
92 struct cfg80211_registered_device *
93 __cfg80211_rdev_from_info(struct genl_info *info)
96 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
97 struct net_device *dev;
100 assert_cfg80211_lock();
102 if (info->attrs[NL80211_ATTR_WIPHY]) {
103 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
104 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
108 if (info->attrs[NL80211_ATTR_IFINDEX]) {
109 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
110 dev = dev_get_by_index(genl_info_net(info), ifindex);
112 if (dev->ieee80211_ptr)
114 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
120 if (bywiphyidx && byifidx) {
121 if (bywiphyidx != byifidx)
122 return ERR_PTR(-EINVAL);
124 return bywiphyidx; /* == byifidx */
135 struct cfg80211_registered_device *
136 cfg80211_get_dev_from_info(struct genl_info *info)
138 struct cfg80211_registered_device *rdev;
140 mutex_lock(&cfg80211_mutex);
141 rdev = __cfg80211_rdev_from_info(info);
143 /* if it is not an error we grab the lock on
144 * it to assure it won't be going away while
145 * we operate on it */
147 mutex_lock(&rdev->mtx);
149 mutex_unlock(&cfg80211_mutex);
154 struct cfg80211_registered_device *
155 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
157 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
158 struct net_device *dev;
160 mutex_lock(&cfg80211_mutex);
161 dev = dev_get_by_index(net, ifindex);
164 if (dev->ieee80211_ptr) {
165 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
166 mutex_lock(&rdev->mtx);
168 rdev = ERR_PTR(-ENODEV);
171 mutex_unlock(&cfg80211_mutex);
175 /* requires cfg80211_mutex to be held */
176 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
179 struct cfg80211_registered_device *rdev2;
180 int wiphy_idx, taken = -1, result, digits;
182 assert_cfg80211_lock();
184 /* prohibit calling the thing phy%d when %d is not its number */
185 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
186 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
187 /* count number of places needed to print wiphy_idx */
189 while (wiphy_idx /= 10)
192 * deny the name if it is phy<idx> where <idx> is printed
193 * without leading zeroes. taken == strlen(newname) here
195 if (taken == strlen(PHY_NAME) + digits)
200 /* Ignore nop renames */
201 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
204 /* Ensure another device does not already have this name. */
205 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
206 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
209 result = device_rename(&rdev->wiphy.dev, newname);
213 if (rdev->wiphy.debugfsdir &&
214 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
215 rdev->wiphy.debugfsdir,
216 rdev->wiphy.debugfsdir->d_parent,
218 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
221 nl80211_notify_dev_rename(rdev);
226 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
229 struct wireless_dev *wdev;
232 if (!rdev->wiphy.netnsok)
235 list_for_each_entry(wdev, &rdev->netdev_list, list) {
236 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
237 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
240 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
244 /* failed -- clean up to old netns */
245 net = wiphy_net(&rdev->wiphy);
247 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
249 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
250 err = dev_change_net_namespace(wdev->netdev, net,
253 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
257 wiphy_net_set(&rdev->wiphy, net);
262 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
264 struct cfg80211_registered_device *rdev = data;
266 rdev->ops->rfkill_poll(&rdev->wiphy);
269 static int cfg80211_rfkill_set_block(void *data, bool blocked)
271 struct cfg80211_registered_device *rdev = data;
272 struct wireless_dev *wdev;
278 mutex_lock(&rdev->devlist_mtx);
280 list_for_each_entry(wdev, &rdev->netdev_list, list)
281 dev_close(wdev->netdev);
283 mutex_unlock(&rdev->devlist_mtx);
289 static void cfg80211_rfkill_sync_work(struct work_struct *work)
291 struct cfg80211_registered_device *rdev;
293 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
294 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
297 static void cfg80211_event_work(struct work_struct *work)
299 struct cfg80211_registered_device *rdev;
301 rdev = container_of(work, struct cfg80211_registered_device,
305 cfg80211_lock_rdev(rdev);
307 cfg80211_process_rdev_events(rdev);
308 cfg80211_unlock_rdev(rdev);
312 /* exported functions */
314 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
316 static int wiphy_counter;
318 struct cfg80211_registered_device *rdev;
321 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
322 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
323 WARN_ON(ops->connect && !ops->disconnect);
324 WARN_ON(ops->join_ibss && !ops->leave_ibss);
325 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
326 WARN_ON(ops->add_station && !ops->del_station);
327 WARN_ON(ops->add_mpath && !ops->del_mpath);
329 alloc_size = sizeof(*rdev) + sizeof_priv;
331 rdev = kzalloc(alloc_size, GFP_KERNEL);
337 mutex_lock(&cfg80211_mutex);
339 rdev->wiphy_idx = wiphy_counter++;
341 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
343 mutex_unlock(&cfg80211_mutex);
349 mutex_unlock(&cfg80211_mutex);
351 /* give it a proper name */
352 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
354 mutex_init(&rdev->mtx);
355 mutex_init(&rdev->devlist_mtx);
356 INIT_LIST_HEAD(&rdev->netdev_list);
357 spin_lock_init(&rdev->bss_lock);
358 INIT_LIST_HEAD(&rdev->bss_list);
359 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
361 #ifdef CONFIG_CFG80211_WEXT
362 rdev->wiphy.wext = &cfg80211_wext_handler;
365 device_initialize(&rdev->wiphy.dev);
366 rdev->wiphy.dev.class = &ieee80211_class;
367 rdev->wiphy.dev.platform_data = rdev;
369 rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
371 wiphy_net_set(&rdev->wiphy, &init_net);
373 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
374 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
375 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
376 &rdev->rfkill_ops, rdev);
383 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
384 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
385 INIT_WORK(&rdev->event_work, cfg80211_event_work);
387 init_waitqueue_head(&rdev->dev_wait);
390 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
391 * Fragmentation and RTS threshold are disabled by default with the
394 rdev->wiphy.retry_short = 7;
395 rdev->wiphy.retry_long = 4;
396 rdev->wiphy.frag_threshold = (u32) -1;
397 rdev->wiphy.rts_threshold = (u32) -1;
401 EXPORT_SYMBOL(wiphy_new);
403 int wiphy_register(struct wiphy *wiphy)
405 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
407 enum ieee80211_band band;
408 struct ieee80211_supported_band *sband;
409 bool have_band = false;
411 u16 ifmodes = wiphy->interface_modes;
413 /* sanity check ifmodes */
415 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
416 if (WARN_ON(ifmodes != wiphy->interface_modes))
417 wiphy->interface_modes = ifmodes;
419 /* sanity check supported bands/channels */
420 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
421 sband = wiphy->bands[band];
427 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
431 * Since we use a u32 for rate bitmaps in
432 * ieee80211_get_response_rate, we cannot
433 * have more than 32 legacy rates.
435 if (WARN_ON(sband->n_bitrates > 32))
438 for (i = 0; i < sband->n_channels; i++) {
439 sband->channels[i].orig_flags =
440 sband->channels[i].flags;
441 sband->channels[i].orig_mag =
442 sband->channels[i].max_antenna_gain;
443 sband->channels[i].orig_mpwr =
444 sband->channels[i].max_power;
445 sband->channels[i].band = band;
456 /* check and set up bitrates */
457 ieee80211_set_bitrate_flags(wiphy);
459 res = device_add(&rdev->wiphy.dev);
463 res = rfkill_register(rdev->rfkill);
467 mutex_lock(&cfg80211_mutex);
469 /* set up regulatory info */
470 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
472 list_add(&rdev->list, &cfg80211_rdev_list);
473 cfg80211_rdev_list_generation++;
475 mutex_unlock(&cfg80211_mutex);
478 rdev->wiphy.debugfsdir =
479 debugfs_create_dir(wiphy_name(&rdev->wiphy),
480 ieee80211_debugfs_dir);
481 if (IS_ERR(rdev->wiphy.debugfsdir))
482 rdev->wiphy.debugfsdir = NULL;
484 if (wiphy->custom_regulatory) {
485 struct regulatory_request request;
487 request.wiphy_idx = get_wiphy_idx(wiphy);
488 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
489 request.alpha2[0] = '9';
490 request.alpha2[1] = '9';
492 nl80211_send_reg_change_event(&request);
495 cfg80211_debugfs_rdev_add(rdev);
500 device_del(&rdev->wiphy.dev);
503 EXPORT_SYMBOL(wiphy_register);
505 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
507 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
509 if (!rdev->ops->rfkill_poll)
511 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
512 rfkill_resume_polling(rdev->rfkill);
514 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
516 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
518 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
520 rfkill_pause_polling(rdev->rfkill);
522 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
524 void wiphy_unregister(struct wiphy *wiphy)
526 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
528 rfkill_unregister(rdev->rfkill);
530 /* protect the device list */
531 mutex_lock(&cfg80211_mutex);
533 wait_event(rdev->dev_wait, ({
535 mutex_lock(&rdev->devlist_mtx);
536 __count = rdev->opencount;
537 mutex_unlock(&rdev->devlist_mtx);
540 mutex_lock(&rdev->devlist_mtx);
541 BUG_ON(!list_empty(&rdev->netdev_list));
542 mutex_unlock(&rdev->devlist_mtx);
545 * First remove the hardware from everywhere, this makes
546 * it impossible to find from userspace.
548 cfg80211_debugfs_rdev_del(rdev);
549 list_del(&rdev->list);
552 * Try to grab rdev->mtx. If a command is still in progress,
553 * hopefully the driver will refuse it since it's tearing
554 * down the device already. We wait for this command to complete
555 * before unlinking the item from the list.
556 * Note: as codified by the BUG_ON above we cannot get here if
557 * a virtual interface is still present. Hence, we can only get
558 * to lock contention here if userspace issues a command that
559 * identified the hardware by wiphy index.
561 cfg80211_lock_rdev(rdev);
563 cfg80211_unlock_rdev(rdev);
565 /* If this device got a regulatory hint tell core its
566 * free to listen now to a new shiny device regulatory hint */
567 reg_device_remove(wiphy);
569 cfg80211_rdev_list_generation++;
570 device_del(&rdev->wiphy.dev);
571 debugfs_remove(rdev->wiphy.debugfsdir);
573 mutex_unlock(&cfg80211_mutex);
575 flush_work(&rdev->scan_done_wk);
576 cancel_work_sync(&rdev->conn_work);
577 flush_work(&rdev->event_work);
579 EXPORT_SYMBOL(wiphy_unregister);
581 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
583 struct cfg80211_internal_bss *scan, *tmp;
584 rfkill_destroy(rdev->rfkill);
585 mutex_destroy(&rdev->mtx);
586 mutex_destroy(&rdev->devlist_mtx);
587 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
588 cfg80211_put_bss(&scan->pub);
592 void wiphy_free(struct wiphy *wiphy)
594 put_device(&wiphy->dev);
596 EXPORT_SYMBOL(wiphy_free);
598 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
600 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
602 if (rfkill_set_hw_state(rdev->rfkill, blocked))
603 schedule_work(&rdev->rfkill_sync);
605 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
607 static void wdev_cleanup_work(struct work_struct *work)
609 struct wireless_dev *wdev;
610 struct cfg80211_registered_device *rdev;
612 wdev = container_of(work, struct wireless_dev, cleanup_work);
613 rdev = wiphy_to_dev(wdev->wiphy);
615 cfg80211_lock_rdev(rdev);
617 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
618 rdev->scan_req->aborted = true;
619 ___cfg80211_scan_done(rdev, true);
622 cfg80211_unlock_rdev(rdev);
624 mutex_lock(&rdev->devlist_mtx);
626 mutex_unlock(&rdev->devlist_mtx);
627 wake_up(&rdev->dev_wait);
629 dev_put(wdev->netdev);
632 static struct device_type wiphy_type = {
636 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
640 struct net_device *dev = ndev;
641 struct wireless_dev *wdev = dev->ieee80211_ptr;
642 struct cfg80211_registered_device *rdev;
647 rdev = wiphy_to_dev(wdev->wiphy);
649 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
652 case NETDEV_POST_INIT:
653 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
655 case NETDEV_REGISTER:
657 * NB: cannot take rdev->mtx here because this may be
658 * called within code protected by it when interfaces
659 * are added with nl80211.
661 mutex_init(&wdev->mtx);
662 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
663 INIT_LIST_HEAD(&wdev->event_list);
664 spin_lock_init(&wdev->event_lock);
665 mutex_lock(&rdev->devlist_mtx);
666 list_add(&wdev->list, &rdev->netdev_list);
667 rdev->devlist_generation++;
668 /* can only change netns with wiphy */
669 dev->features |= NETIF_F_NETNS_LOCAL;
671 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
673 printk(KERN_ERR "wireless: failed to add phy80211 "
674 "symlink to netdev!\n");
677 wdev->sme_state = CFG80211_SME_IDLE;
678 mutex_unlock(&rdev->devlist_mtx);
679 #ifdef CONFIG_CFG80211_WEXT
680 wdev->wext.default_key = -1;
681 wdev->wext.default_mgmt_key = -1;
682 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
683 wdev->wext.ps = wdev->wiphy->ps_default;
684 wdev->wext.ps_timeout = 100;
685 if (rdev->ops->set_power_mgmt)
686 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
688 wdev->wext.ps_timeout)) {
689 /* assume this means it's off */
690 wdev->wext.ps = false;
694 case NETDEV_GOING_DOWN:
695 switch (wdev->iftype) {
696 case NL80211_IFTYPE_ADHOC:
697 cfg80211_leave_ibss(rdev, dev, true);
699 case NL80211_IFTYPE_STATION:
701 #ifdef CONFIG_CFG80211_WEXT
702 kfree(wdev->wext.ie);
703 wdev->wext.ie = NULL;
704 wdev->wext.ie_len = 0;
705 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
707 __cfg80211_disconnect(rdev, dev,
708 WLAN_REASON_DEAUTH_LEAVING, true);
709 cfg80211_mlme_down(rdev, dev);
718 schedule_work(&wdev->cleanup_work);
722 * If we have a really quick DOWN/UP succession we may
723 * have this work still pending ... cancel it and see
724 * if it was pending, in which case we need to account
725 * for some of the work it would have done.
727 if (cancel_work_sync(&wdev->cleanup_work)) {
728 mutex_lock(&rdev->devlist_mtx);
730 mutex_unlock(&rdev->devlist_mtx);
733 #ifdef CONFIG_CFG80211_WEXT
734 cfg80211_lock_rdev(rdev);
735 mutex_lock(&rdev->devlist_mtx);
737 switch (wdev->iftype) {
738 case NL80211_IFTYPE_ADHOC:
739 cfg80211_ibss_wext_join(rdev, wdev);
741 case NL80211_IFTYPE_STATION:
742 cfg80211_mgd_wext_connect(rdev, wdev);
749 mutex_unlock(&rdev->devlist_mtx);
750 cfg80211_unlock_rdev(rdev);
753 case NETDEV_UNREGISTER:
755 * NB: cannot take rdev->mtx here because this may be
756 * called within code protected by it when interfaces
757 * are removed with nl80211.
759 mutex_lock(&rdev->devlist_mtx);
761 * It is possible to get NETDEV_UNREGISTER
762 * multiple times. To detect that, check
763 * that the interface is still on the list
764 * of registered interfaces, and only then
765 * remove and clean it up.
767 if (!list_empty(&wdev->list)) {
768 sysfs_remove_link(&dev->dev.kobj, "phy80211");
769 list_del_init(&wdev->list);
770 rdev->devlist_generation++;
771 #ifdef CONFIG_CFG80211_WEXT
772 kfree(wdev->wext.keys);
775 mutex_unlock(&rdev->devlist_mtx);
778 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
779 return notifier_from_errno(-EOPNOTSUPP);
780 if (rfkill_blocked(rdev->rfkill))
781 return notifier_from_errno(-ERFKILL);
788 static struct notifier_block cfg80211_netdev_notifier = {
789 .notifier_call = cfg80211_netdev_notifier_call,
792 static void __net_exit cfg80211_pernet_exit(struct net *net)
794 struct cfg80211_registered_device *rdev;
797 mutex_lock(&cfg80211_mutex);
798 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
799 if (net_eq(wiphy_net(&rdev->wiphy), net))
800 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
802 mutex_unlock(&cfg80211_mutex);
806 static struct pernet_operations cfg80211_pernet_ops = {
807 .exit = cfg80211_pernet_exit,
810 static int __init cfg80211_init(void)
814 err = register_pernet_device(&cfg80211_pernet_ops);
816 goto out_fail_pernet;
818 err = wiphy_sysfs_init();
822 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
824 goto out_fail_notifier;
826 err = nl80211_init();
828 goto out_fail_nl80211;
830 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
832 err = regulatory_init();
839 debugfs_remove(ieee80211_debugfs_dir);
841 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
845 unregister_pernet_device(&cfg80211_pernet_ops);
849 subsys_initcall(cfg80211_init);
851 static void cfg80211_exit(void)
853 debugfs_remove(ieee80211_debugfs_dir);
855 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
858 unregister_pernet_device(&cfg80211_pernet_ops);
860 module_exit(cfg80211_exit);