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"
26 /* name for sysfs, %d is appended */
27 #define PHY_NAME "phy"
29 MODULE_AUTHOR("Johannes Berg");
30 MODULE_LICENSE("GPL");
31 MODULE_DESCRIPTION("wireless configuration support");
33 /* RCU might be appropriate here since we usually
34 * only read the list, and that can happen quite
35 * often because we need to do it for each command */
36 LIST_HEAD(cfg80211_rdev_list);
37 int cfg80211_rdev_list_generation;
40 * This is used to protect the cfg80211_rdev_list
42 DEFINE_MUTEX(cfg80211_mutex);
45 static struct dentry *ieee80211_debugfs_dir;
47 /* requires cfg80211_mutex to be held! */
48 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
50 struct cfg80211_registered_device *result = NULL, *rdev;
52 if (!wiphy_idx_valid(wiphy_idx))
55 assert_cfg80211_lock();
57 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
58 if (rdev->wiphy_idx == wiphy_idx) {
67 int get_wiphy_idx(struct wiphy *wiphy)
69 struct cfg80211_registered_device *rdev;
71 return WIPHY_IDX_STALE;
72 rdev = wiphy_to_dev(wiphy);
73 return rdev->wiphy_idx;
76 /* requires cfg80211_rdev_mutex to be held! */
77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
79 struct cfg80211_registered_device *rdev;
81 if (!wiphy_idx_valid(wiphy_idx))
84 assert_cfg80211_lock();
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
92 /* requires cfg80211_mutex to be held! */
93 struct cfg80211_registered_device *
94 __cfg80211_rdev_from_info(struct genl_info *info)
97 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
98 struct net_device *dev;
101 assert_cfg80211_lock();
103 if (info->attrs[NL80211_ATTR_WIPHY]) {
104 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
105 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
109 if (info->attrs[NL80211_ATTR_IFINDEX]) {
110 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
111 dev = dev_get_by_index(genl_info_net(info), ifindex);
113 if (dev->ieee80211_ptr)
115 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
121 if (bywiphyidx && byifidx) {
122 if (bywiphyidx != byifidx)
123 return ERR_PTR(-EINVAL);
125 return bywiphyidx; /* == byifidx */
136 struct cfg80211_registered_device *
137 cfg80211_get_dev_from_info(struct genl_info *info)
139 struct cfg80211_registered_device *rdev;
141 mutex_lock(&cfg80211_mutex);
142 rdev = __cfg80211_rdev_from_info(info);
144 /* if it is not an error we grab the lock on
145 * it to assure it won't be going away while
146 * we operate on it */
148 mutex_lock(&rdev->mtx);
150 mutex_unlock(&cfg80211_mutex);
155 struct cfg80211_registered_device *
156 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
158 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
159 struct net_device *dev;
161 mutex_lock(&cfg80211_mutex);
162 dev = dev_get_by_index(net, ifindex);
165 if (dev->ieee80211_ptr) {
166 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
167 mutex_lock(&rdev->mtx);
169 rdev = ERR_PTR(-ENODEV);
172 mutex_unlock(&cfg80211_mutex);
176 /* requires cfg80211_mutex to be held */
177 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
180 struct cfg80211_registered_device *rdev2;
181 int wiphy_idx, taken = -1, result, digits;
183 assert_cfg80211_lock();
185 /* prohibit calling the thing phy%d when %d is not its number */
186 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
187 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
188 /* count number of places needed to print wiphy_idx */
190 while (wiphy_idx /= 10)
193 * deny the name if it is phy<idx> where <idx> is printed
194 * without leading zeroes. taken == strlen(newname) here
196 if (taken == strlen(PHY_NAME) + digits)
201 /* Ignore nop renames */
202 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
205 /* Ensure another device does not already have this name. */
206 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
207 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
210 result = device_rename(&rdev->wiphy.dev, newname);
214 if (rdev->wiphy.debugfsdir &&
215 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
216 rdev->wiphy.debugfsdir,
217 rdev->wiphy.debugfsdir->d_parent,
219 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
222 nl80211_notify_dev_rename(rdev);
227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
230 struct wireless_dev *wdev;
233 if (!rdev->wiphy.netnsok)
236 list_for_each_entry(wdev, &rdev->netdev_list, list) {
237 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
238 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
241 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
245 /* failed -- clean up to old netns */
246 net = wiphy_net(&rdev->wiphy);
248 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
250 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
251 err = dev_change_net_namespace(wdev->netdev, net,
254 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
258 wiphy_net_set(&rdev->wiphy, net);
263 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
265 struct cfg80211_registered_device *rdev = data;
267 rdev->ops->rfkill_poll(&rdev->wiphy);
270 static int cfg80211_rfkill_set_block(void *data, bool blocked)
272 struct cfg80211_registered_device *rdev = data;
273 struct wireless_dev *wdev;
279 mutex_lock(&rdev->devlist_mtx);
281 list_for_each_entry(wdev, &rdev->netdev_list, list)
282 dev_close(wdev->netdev);
284 mutex_unlock(&rdev->devlist_mtx);
290 static void cfg80211_rfkill_sync_work(struct work_struct *work)
292 struct cfg80211_registered_device *rdev;
294 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
295 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
298 static void cfg80211_event_work(struct work_struct *work)
300 struct cfg80211_registered_device *rdev;
302 rdev = container_of(work, struct cfg80211_registered_device,
306 cfg80211_lock_rdev(rdev);
308 cfg80211_process_rdev_events(rdev);
309 cfg80211_unlock_rdev(rdev);
313 /* exported functions */
315 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
317 static int wiphy_counter;
319 struct cfg80211_registered_device *rdev;
322 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
323 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
324 WARN_ON(ops->connect && !ops->disconnect);
325 WARN_ON(ops->join_ibss && !ops->leave_ibss);
326 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
327 WARN_ON(ops->add_station && !ops->del_station);
328 WARN_ON(ops->add_mpath && !ops->del_mpath);
330 alloc_size = sizeof(*rdev) + sizeof_priv;
332 rdev = kzalloc(alloc_size, GFP_KERNEL);
338 mutex_lock(&cfg80211_mutex);
340 rdev->wiphy_idx = wiphy_counter++;
342 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
344 mutex_unlock(&cfg80211_mutex);
350 mutex_unlock(&cfg80211_mutex);
352 /* give it a proper name */
353 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
355 mutex_init(&rdev->mtx);
356 mutex_init(&rdev->devlist_mtx);
357 INIT_LIST_HEAD(&rdev->netdev_list);
358 spin_lock_init(&rdev->bss_lock);
359 INIT_LIST_HEAD(&rdev->bss_list);
360 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
362 #ifdef CONFIG_CFG80211_WEXT
363 rdev->wiphy.wext = &cfg80211_wext_handler;
366 device_initialize(&rdev->wiphy.dev);
367 rdev->wiphy.dev.class = &ieee80211_class;
368 rdev->wiphy.dev.platform_data = rdev;
370 rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
372 wiphy_net_set(&rdev->wiphy, &init_net);
374 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
375 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
376 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
377 &rdev->rfkill_ops, rdev);
384 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
385 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
386 INIT_WORK(&rdev->event_work, cfg80211_event_work);
388 init_waitqueue_head(&rdev->dev_wait);
391 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
392 * Fragmentation and RTS threshold are disabled by default with the
395 rdev->wiphy.retry_short = 7;
396 rdev->wiphy.retry_long = 4;
397 rdev->wiphy.frag_threshold = (u32) -1;
398 rdev->wiphy.rts_threshold = (u32) -1;
402 EXPORT_SYMBOL(wiphy_new);
404 int wiphy_register(struct wiphy *wiphy)
406 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
408 enum ieee80211_band band;
409 struct ieee80211_supported_band *sband;
410 bool have_band = false;
412 u16 ifmodes = wiphy->interface_modes;
414 /* sanity check ifmodes */
416 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
417 if (WARN_ON(ifmodes != wiphy->interface_modes))
418 wiphy->interface_modes = ifmodes;
420 /* sanity check supported bands/channels */
421 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
422 sband = wiphy->bands[band];
428 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
432 * Since we use a u32 for rate bitmaps in
433 * ieee80211_get_response_rate, we cannot
434 * have more than 32 legacy rates.
436 if (WARN_ON(sband->n_bitrates > 32))
439 for (i = 0; i < sband->n_channels; i++) {
440 sband->channels[i].orig_flags =
441 sband->channels[i].flags;
442 sband->channels[i].orig_mag =
443 sband->channels[i].max_antenna_gain;
444 sband->channels[i].orig_mpwr =
445 sband->channels[i].max_power;
446 sband->channels[i].band = band;
457 /* check and set up bitrates */
458 ieee80211_set_bitrate_flags(wiphy);
460 res = device_add(&rdev->wiphy.dev);
464 res = rfkill_register(rdev->rfkill);
468 mutex_lock(&cfg80211_mutex);
470 /* set up regulatory info */
471 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
473 list_add(&rdev->list, &cfg80211_rdev_list);
474 cfg80211_rdev_list_generation++;
476 mutex_unlock(&cfg80211_mutex);
479 rdev->wiphy.debugfsdir =
480 debugfs_create_dir(wiphy_name(&rdev->wiphy),
481 ieee80211_debugfs_dir);
482 if (IS_ERR(rdev->wiphy.debugfsdir))
483 rdev->wiphy.debugfsdir = NULL;
485 if (wiphy->custom_regulatory) {
486 struct regulatory_request request;
488 request.wiphy_idx = get_wiphy_idx(wiphy);
489 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
490 request.alpha2[0] = '9';
491 request.alpha2[1] = '9';
493 nl80211_send_reg_change_event(&request);
496 cfg80211_debugfs_rdev_add(rdev);
501 device_del(&rdev->wiphy.dev);
504 EXPORT_SYMBOL(wiphy_register);
506 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
508 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
510 if (!rdev->ops->rfkill_poll)
512 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
513 rfkill_resume_polling(rdev->rfkill);
515 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
517 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
519 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
521 rfkill_pause_polling(rdev->rfkill);
523 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
525 void wiphy_unregister(struct wiphy *wiphy)
527 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
529 rfkill_unregister(rdev->rfkill);
531 /* protect the device list */
532 mutex_lock(&cfg80211_mutex);
534 wait_event(rdev->dev_wait, ({
536 mutex_lock(&rdev->devlist_mtx);
537 __count = rdev->opencount;
538 mutex_unlock(&rdev->devlist_mtx);
541 mutex_lock(&rdev->devlist_mtx);
542 BUG_ON(!list_empty(&rdev->netdev_list));
543 mutex_unlock(&rdev->devlist_mtx);
546 * First remove the hardware from everywhere, this makes
547 * it impossible to find from userspace.
549 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
550 list_del(&rdev->list);
553 * Try to grab rdev->mtx. If a command is still in progress,
554 * hopefully the driver will refuse it since it's tearing
555 * down the device already. We wait for this command to complete
556 * before unlinking the item from the list.
557 * Note: as codified by the BUG_ON above we cannot get here if
558 * a virtual interface is still present. Hence, we can only get
559 * to lock contention here if userspace issues a command that
560 * identified the hardware by wiphy index.
562 cfg80211_lock_rdev(rdev);
564 cfg80211_unlock_rdev(rdev);
566 /* If this device got a regulatory hint tell core its
567 * free to listen now to a new shiny device regulatory hint */
568 reg_device_remove(wiphy);
570 cfg80211_rdev_list_generation++;
571 device_del(&rdev->wiphy.dev);
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;
693 if (!dev->ethtool_ops)
694 dev->ethtool_ops = &cfg80211_ethtool_ops;
696 case NETDEV_GOING_DOWN:
697 switch (wdev->iftype) {
698 case NL80211_IFTYPE_ADHOC:
699 cfg80211_leave_ibss(rdev, dev, true);
701 case NL80211_IFTYPE_STATION:
703 #ifdef CONFIG_CFG80211_WEXT
704 kfree(wdev->wext.ie);
705 wdev->wext.ie = NULL;
706 wdev->wext.ie_len = 0;
707 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
709 __cfg80211_disconnect(rdev, dev,
710 WLAN_REASON_DEAUTH_LEAVING, true);
711 cfg80211_mlme_down(rdev, dev);
720 schedule_work(&wdev->cleanup_work);
724 * If we have a really quick DOWN/UP succession we may
725 * have this work still pending ... cancel it and see
726 * if it was pending, in which case we need to account
727 * for some of the work it would have done.
729 if (cancel_work_sync(&wdev->cleanup_work)) {
730 mutex_lock(&rdev->devlist_mtx);
732 mutex_unlock(&rdev->devlist_mtx);
735 #ifdef CONFIG_CFG80211_WEXT
736 cfg80211_lock_rdev(rdev);
737 mutex_lock(&rdev->devlist_mtx);
739 switch (wdev->iftype) {
740 case NL80211_IFTYPE_ADHOC:
741 cfg80211_ibss_wext_join(rdev, wdev);
743 case NL80211_IFTYPE_STATION:
744 cfg80211_mgd_wext_connect(rdev, wdev);
751 mutex_unlock(&rdev->devlist_mtx);
752 cfg80211_unlock_rdev(rdev);
755 case NETDEV_UNREGISTER:
757 * NB: cannot take rdev->mtx here because this may be
758 * called within code protected by it when interfaces
759 * are removed with nl80211.
761 mutex_lock(&rdev->devlist_mtx);
763 * It is possible to get NETDEV_UNREGISTER
764 * multiple times. To detect that, check
765 * that the interface is still on the list
766 * of registered interfaces, and only then
767 * remove and clean it up.
769 if (!list_empty(&wdev->list)) {
770 sysfs_remove_link(&dev->dev.kobj, "phy80211");
771 list_del_init(&wdev->list);
772 rdev->devlist_generation++;
773 #ifdef CONFIG_CFG80211_WEXT
774 kfree(wdev->wext.keys);
777 mutex_unlock(&rdev->devlist_mtx);
780 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
781 return notifier_from_errno(-EOPNOTSUPP);
782 if (rfkill_blocked(rdev->rfkill))
783 return notifier_from_errno(-ERFKILL);
790 static struct notifier_block cfg80211_netdev_notifier = {
791 .notifier_call = cfg80211_netdev_notifier_call,
794 static void __net_exit cfg80211_pernet_exit(struct net *net)
796 struct cfg80211_registered_device *rdev;
799 mutex_lock(&cfg80211_mutex);
800 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
801 if (net_eq(wiphy_net(&rdev->wiphy), net))
802 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
804 mutex_unlock(&cfg80211_mutex);
808 static struct pernet_operations cfg80211_pernet_ops = {
809 .exit = cfg80211_pernet_exit,
812 static int __init cfg80211_init(void)
816 err = register_pernet_device(&cfg80211_pernet_ops);
818 goto out_fail_pernet;
820 err = wiphy_sysfs_init();
824 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
826 goto out_fail_notifier;
828 err = nl80211_init();
830 goto out_fail_nl80211;
832 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
834 err = regulatory_init();
841 debugfs_remove(ieee80211_debugfs_dir);
843 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
847 unregister_pernet_device(&cfg80211_pernet_ops);
851 subsys_initcall(cfg80211_init);
853 static void cfg80211_exit(void)
855 debugfs_remove(ieee80211_debugfs_dir);
857 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
860 unregister_pernet_device(&cfg80211_pernet_ops);
862 module_exit(cfg80211_exit);