2 * Interface handling (except master interface)
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
22 #include "debugfs_netdev.h"
25 #include "driver-ops.h"
30 * DOC: Interface list locking
32 * The interface list in each struct ieee80211_local is protected
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
49 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
51 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
53 /* FIX: what would be proper limits for MTU?
54 * This interface uses 802.3 frames. */
56 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
61 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
69 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
70 struct sockaddr *sa = addr;
73 if (ieee80211_sdata_running(sdata))
76 ret = eth_mac_addr(dev, sa);
79 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
84 static inline int identical_mac_addr_allowed(int type1, int type2)
86 return type1 == NL80211_IFTYPE_MONITOR ||
87 type2 == NL80211_IFTYPE_MONITOR ||
88 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
89 (type1 == NL80211_IFTYPE_WDS &&
90 (type2 == NL80211_IFTYPE_WDS ||
91 type2 == NL80211_IFTYPE_AP)) ||
92 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
93 (type1 == NL80211_IFTYPE_AP_VLAN &&
94 (type2 == NL80211_IFTYPE_AP ||
95 type2 == NL80211_IFTYPE_AP_VLAN));
98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
99 enum nl80211_iftype iftype)
101 struct ieee80211_local *local = sdata->local;
102 struct ieee80211_sub_if_data *nsdata;
103 struct net_device *dev = sdata->dev;
107 /* we hold the RTNL here so can safely walk the list */
108 list_for_each_entry(nsdata, &local->interfaces, list) {
109 struct net_device *ndev = nsdata->dev;
111 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
113 * Allow only a single IBSS interface to be up at any
114 * time. This is restricted because beacon distribution
115 * cannot work properly if both are in the same IBSS.
117 * To remove this restriction we'd have to disallow them
118 * from setting the same SSID on different IBSS interfaces
119 * belonging to the same hardware. Then, however, we're
120 * faced with having to adopt two different TSF timers...
122 if (iftype == NL80211_IFTYPE_ADHOC &&
123 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
127 * The remaining checks are only performed for interfaces
128 * with the same MAC address.
130 if (!ether_addr_equal(dev->dev_addr, ndev->dev_addr))
134 * check whether it may have the same address
136 if (!identical_mac_addr_allowed(iftype,
141 * can only add VLANs to enabled APs
143 if (iftype == NL80211_IFTYPE_AP_VLAN &&
144 nsdata->vif.type == NL80211_IFTYPE_AP)
145 sdata->bss = &nsdata->u.ap;
152 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
154 int n_queues = sdata->local->hw.queues;
157 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
158 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
159 IEEE80211_INVAL_HW_QUEUE))
161 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
166 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
167 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
168 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
172 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
175 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
181 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
184 struct ieee80211_local *local = sdata->local;
185 u32 flags = sdata->u.mntr_flags;
187 #define ADJUST(_f, _s) do { \
188 if (flags & MONITOR_FLAG_##_f) \
189 local->fif_##_s += offset; \
192 ADJUST(FCSFAIL, fcsfail);
193 ADJUST(PLCPFAIL, plcpfail);
194 ADJUST(CONTROL, control);
195 ADJUST(CONTROL, pspoll);
196 ADJUST(OTHER_BSS, other_bss);
201 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
203 struct ieee80211_local *local = sdata->local;
206 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
207 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
208 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
209 else if (local->hw.queues >= IEEE80211_NUM_ACS)
210 sdata->vif.hw_queue[i] = i;
212 sdata->vif.hw_queue[i] = 0;
214 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
217 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
219 struct ieee80211_sub_if_data *sdata;
222 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
225 if (local->monitor_sdata)
228 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
233 sdata->local = local;
234 sdata->vif.type = NL80211_IFTYPE_MONITOR;
235 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
236 wiphy_name(local->hw.wiphy));
238 ieee80211_set_default_queues(sdata);
240 ret = drv_add_interface(local, sdata);
242 /* ok .. stupid driver, it asked for this! */
247 ret = ieee80211_check_queues(sdata);
253 rcu_assign_pointer(local->monitor_sdata, sdata);
258 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
260 struct ieee80211_sub_if_data *sdata;
262 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
265 sdata = rtnl_dereference(local->monitor_sdata);
270 rcu_assign_pointer(local->monitor_sdata, NULL);
273 drv_remove_interface(local, sdata);
279 * NOTE: Be very careful when changing this function, it must NOT return
280 * an error on interface type changes that have been pre-checked, so most
281 * checks should be in ieee80211_check_concurrent_iface.
283 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
285 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
286 struct ieee80211_local *local = sdata->local;
287 struct sta_info *sta;
290 u32 hw_reconf_flags = 0;
292 switch (sdata->vif.type) {
293 case NL80211_IFTYPE_WDS:
294 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
297 case NL80211_IFTYPE_AP_VLAN: {
298 struct ieee80211_sub_if_data *master;
303 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
305 master = container_of(sdata->bss,
306 struct ieee80211_sub_if_data, u.ap);
307 sdata->control_port_protocol =
308 master->control_port_protocol;
309 sdata->control_port_no_encrypt =
310 master->control_port_no_encrypt;
313 case NL80211_IFTYPE_AP:
314 sdata->bss = &sdata->u.ap;
316 case NL80211_IFTYPE_MESH_POINT:
317 case NL80211_IFTYPE_STATION:
318 case NL80211_IFTYPE_MONITOR:
319 case NL80211_IFTYPE_ADHOC:
320 /* no special treatment */
322 case NL80211_IFTYPE_UNSPECIFIED:
323 case NUM_NL80211_IFTYPES:
324 case NL80211_IFTYPE_P2P_CLIENT:
325 case NL80211_IFTYPE_P2P_GO:
331 if (local->open_count == 0) {
332 res = drv_start(local);
335 if (local->ops->napi_poll)
336 napi_enable(&local->napi);
337 /* we're brought up, everything changes */
338 hw_reconf_flags = ~0;
339 ieee80211_led_radio(local, true);
340 ieee80211_mod_tpt_led_trig(local,
341 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
345 * Copy the hopefully now-present MAC address to
346 * this interface, if it has the special null one.
348 if (is_zero_ether_addr(dev->dev_addr)) {
349 memcpy(dev->dev_addr,
350 local->hw.wiphy->perm_addr,
352 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
354 if (!is_valid_ether_addr(dev->dev_addr)) {
355 res = -EADDRNOTAVAIL;
360 switch (sdata->vif.type) {
361 case NL80211_IFTYPE_AP_VLAN:
362 /* no need to tell driver, but set carrier */
363 if (rtnl_dereference(sdata->bss->beacon))
364 netif_carrier_on(dev);
366 netif_carrier_off(dev);
368 case NL80211_IFTYPE_MONITOR:
369 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
370 local->cooked_mntrs++;
374 if (local->monitors == 0 && local->open_count == 0) {
375 res = ieee80211_add_virtual_monitor(local);
380 /* must be before the call to ieee80211_configure_filter */
382 if (local->monitors == 1) {
383 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
384 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
387 ieee80211_adjust_monitor_flags(sdata, 1);
388 ieee80211_configure_filter(local);
390 netif_carrier_on(dev);
394 ieee80211_del_virtual_monitor(local);
396 res = drv_add_interface(local, sdata);
399 res = ieee80211_check_queues(sdata);
401 goto err_del_interface;
404 if (sdata->vif.type == NL80211_IFTYPE_AP) {
406 local->fif_probe_req++;
408 ieee80211_configure_filter(local);
409 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
410 local->fif_probe_req++;
413 changed |= ieee80211_reset_erp_info(sdata);
414 ieee80211_bss_info_change_notify(sdata, changed);
416 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
417 sdata->vif.type == NL80211_IFTYPE_ADHOC ||
418 sdata->vif.type == NL80211_IFTYPE_AP)
419 netif_carrier_off(dev);
421 netif_carrier_on(dev);
424 * set default queue parameters so drivers don't
425 * need to initialise the hardware if the hardware
426 * doesn't start up with sane defaults
428 ieee80211_set_wmm_default(sdata, true);
431 set_bit(SDATA_STATE_RUNNING, &sdata->state);
433 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
434 /* Create STA entry for the WDS peer */
435 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
439 goto err_del_interface;
442 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
443 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
444 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
446 res = sta_info_insert(sta);
448 /* STA has been freed */
449 goto err_del_interface;
452 rate_control_rate_init(sta);
456 * set_multicast_list will be invoked by the networking core
457 * which will check whether any increments here were done in
458 * error and sync them down to the hardware as filter flags.
460 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
461 atomic_inc(&local->iff_allmultis);
463 if (sdata->flags & IEEE80211_SDATA_PROMISC)
464 atomic_inc(&local->iff_promiscs);
466 mutex_lock(&local->mtx);
467 hw_reconf_flags |= __ieee80211_recalc_idle(local);
468 mutex_unlock(&local->mtx);
474 ieee80211_hw_config(local, hw_reconf_flags);
476 ieee80211_recalc_ps(local, -1);
478 netif_tx_start_all_queues(dev);
482 drv_remove_interface(local, sdata);
484 if (!local->open_count)
488 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
489 list_del(&sdata->u.vlan.list);
490 /* might already be clear but that doesn't matter */
491 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
495 static int ieee80211_open(struct net_device *dev)
497 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
500 /* fail early if user set an invalid address */
501 if (!is_valid_ether_addr(dev->dev_addr))
502 return -EADDRNOTAVAIL;
504 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
508 return ieee80211_do_open(dev, true);
511 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
514 struct ieee80211_local *local = sdata->local;
516 struct sk_buff *skb, *tmp;
517 u32 hw_reconf_flags = 0;
519 enum nl80211_channel_type orig_ct;
521 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
523 if (local->scan_sdata == sdata)
524 ieee80211_scan_cancel(local);
527 * Stop TX on this interface first.
529 netif_tx_stop_all_queues(sdata->dev);
532 * Purge work for this interface.
534 ieee80211_work_purge(sdata);
537 * Remove all stations associated with this interface.
539 * This must be done before calling ops->remove_interface()
540 * because otherwise we can later invoke ops->sta_notify()
541 * whenever the STAs are removed, and that invalidates driver
542 * assumptions about always getting a vif pointer that is valid
543 * (because if we remove a STA after ops->remove_interface()
544 * the driver will have removed the vif info already!)
546 * This is relevant only in AP, WDS and mesh modes, since in
547 * all other modes we've already removed all stations when
550 sta_info_flush(local, sdata);
553 * Don't count this interface for promisc/allmulti while it
554 * is down. dev_mc_unsync() will invoke set_multicast_list
555 * on the master interface which will sync these down to the
556 * hardware as filter flags.
558 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
559 atomic_dec(&local->iff_allmultis);
561 if (sdata->flags & IEEE80211_SDATA_PROMISC)
562 atomic_dec(&local->iff_promiscs);
564 if (sdata->vif.type == NL80211_IFTYPE_AP) {
566 local->fif_probe_req--;
567 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
568 local->fif_probe_req--;
571 netif_addr_lock_bh(sdata->dev);
572 spin_lock_bh(&local->filter_lock);
573 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
574 sdata->dev->addr_len);
575 spin_unlock_bh(&local->filter_lock);
576 netif_addr_unlock_bh(sdata->dev);
578 ieee80211_configure_filter(local);
580 del_timer_sync(&local->dynamic_ps_timer);
581 cancel_work_sync(&local->dynamic_ps_enable_work);
583 /* APs need special treatment */
584 if (sdata->vif.type == NL80211_IFTYPE_AP) {
585 struct ieee80211_sub_if_data *vlan, *tmpsdata;
586 struct beacon_data *old_beacon =
587 rtnl_dereference(sdata->u.ap.beacon);
588 struct sk_buff *old_probe_resp =
589 rtnl_dereference(sdata->u.ap.probe_resp);
591 /* sdata_running will return false, so this will disable */
592 ieee80211_bss_info_change_notify(sdata,
593 BSS_CHANGED_BEACON_ENABLED);
595 /* remove beacon and probe response */
596 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
597 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
600 kfree_skb(old_probe_resp);
602 /* down all dependent devices, that is VLANs */
603 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
605 dev_close(vlan->dev);
606 WARN_ON(!list_empty(&sdata->u.ap.vlans));
608 /* free all potentially still buffered bcast frames */
609 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
610 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
611 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
612 ieee80211_mgd_stop(sdata);
618 switch (sdata->vif.type) {
619 case NL80211_IFTYPE_AP_VLAN:
620 list_del(&sdata->u.vlan.list);
621 /* no need to tell driver */
623 case NL80211_IFTYPE_MONITOR:
624 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
625 local->cooked_mntrs--;
630 if (local->monitors == 0) {
631 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
632 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
633 ieee80211_del_virtual_monitor(local);
636 ieee80211_adjust_monitor_flags(sdata, -1);
637 ieee80211_configure_filter(local);
640 mutex_lock(&local->mtx);
641 if (local->hw_roc_dev == sdata->dev &&
642 local->hw_roc_channel) {
643 /* ignore return value since this is racy */
644 drv_cancel_remain_on_channel(local);
645 ieee80211_queue_work(&local->hw, &local->hw_roc_done);
647 mutex_unlock(&local->mtx);
649 flush_work(&local->hw_roc_start);
650 flush_work(&local->hw_roc_done);
652 flush_work(&sdata->work);
654 * When we get here, the interface is marked down.
655 * Call synchronize_rcu() to wait for the RX path
656 * should it be using the interface and enqueuing
657 * frames at this very time on another CPU.
660 skb_queue_purge(&sdata->skb_queue);
663 * Disable beaconing here for mesh only, AP and IBSS
664 * are already taken care of.
666 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
667 ieee80211_bss_info_change_notify(sdata,
668 BSS_CHANGED_BEACON_ENABLED);
671 * Free all remaining keys, there shouldn't be any,
672 * except maybe group keys in AP more or WDS?
674 ieee80211_free_keys(sdata);
677 drv_remove_interface(local, sdata);
682 mutex_lock(&local->mtx);
683 hw_reconf_flags |= __ieee80211_recalc_idle(local);
684 mutex_unlock(&local->mtx);
686 ieee80211_recalc_ps(local, -1);
688 if (local->open_count == 0) {
689 if (local->ops->napi_poll)
690 napi_disable(&local->napi);
691 ieee80211_clear_tx_pending(local);
692 ieee80211_stop_device(local);
694 /* no reconfiguring after stop! */
698 /* Re-calculate channel-type, in case there are multiple vifs
699 * on different channel types.
701 orig_ct = local->_oper_channel_type;
702 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
704 /* do after stop to avoid reconfiguring when we stop anyway */
705 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
706 ieee80211_hw_config(local, hw_reconf_flags);
708 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
709 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
710 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
711 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
712 if (info->control.vif == &sdata->vif) {
713 __skb_unlink(skb, &local->pending[i]);
714 dev_kfree_skb_irq(skb);
718 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
720 if (local->monitors == local->open_count && local->monitors > 0)
721 ieee80211_add_virtual_monitor(local);
724 static int ieee80211_stop(struct net_device *dev)
726 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
728 ieee80211_do_stop(sdata, true);
733 static void ieee80211_set_multicast_list(struct net_device *dev)
735 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
736 struct ieee80211_local *local = sdata->local;
737 int allmulti, promisc, sdata_allmulti, sdata_promisc;
739 allmulti = !!(dev->flags & IFF_ALLMULTI);
740 promisc = !!(dev->flags & IFF_PROMISC);
741 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
742 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
744 if (allmulti != sdata_allmulti) {
745 if (dev->flags & IFF_ALLMULTI)
746 atomic_inc(&local->iff_allmultis);
748 atomic_dec(&local->iff_allmultis);
749 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
752 if (promisc != sdata_promisc) {
753 if (dev->flags & IFF_PROMISC)
754 atomic_inc(&local->iff_promiscs);
756 atomic_dec(&local->iff_promiscs);
757 sdata->flags ^= IEEE80211_SDATA_PROMISC;
759 spin_lock_bh(&local->filter_lock);
760 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
761 spin_unlock_bh(&local->filter_lock);
762 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
766 * Called when the netdev is removed or, by the code below, before
767 * the interface type changes.
769 static void ieee80211_teardown_sdata(struct net_device *dev)
771 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
772 struct ieee80211_local *local = sdata->local;
776 /* free extra data */
777 ieee80211_free_keys(sdata);
779 ieee80211_debugfs_remove_netdev(sdata);
781 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
782 __skb_queue_purge(&sdata->fragments[i].skb_list);
783 sdata->fragment_next = 0;
785 if (ieee80211_vif_is_mesh(&sdata->vif))
786 mesh_rmc_free(sdata);
788 flushed = sta_info_flush(local, sdata);
792 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
795 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
798 static const struct net_device_ops ieee80211_dataif_ops = {
799 .ndo_open = ieee80211_open,
800 .ndo_stop = ieee80211_stop,
801 .ndo_uninit = ieee80211_teardown_sdata,
802 .ndo_start_xmit = ieee80211_subif_start_xmit,
803 .ndo_set_rx_mode = ieee80211_set_multicast_list,
804 .ndo_change_mtu = ieee80211_change_mtu,
805 .ndo_set_mac_address = ieee80211_change_mac,
806 .ndo_select_queue = ieee80211_netdev_select_queue,
809 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
812 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
813 struct ieee80211_local *local = sdata->local;
814 struct ieee80211_hdr *hdr;
815 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
817 if (local->hw.queues < IEEE80211_NUM_ACS)
821 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
822 return 0; /* doesn't matter, frame will be dropped */
824 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
826 return ieee80211_select_queue_80211(local, skb, hdr);
829 static const struct net_device_ops ieee80211_monitorif_ops = {
830 .ndo_open = ieee80211_open,
831 .ndo_stop = ieee80211_stop,
832 .ndo_uninit = ieee80211_teardown_sdata,
833 .ndo_start_xmit = ieee80211_monitor_start_xmit,
834 .ndo_set_rx_mode = ieee80211_set_multicast_list,
835 .ndo_change_mtu = ieee80211_change_mtu,
836 .ndo_set_mac_address = eth_mac_addr,
837 .ndo_select_queue = ieee80211_monitor_select_queue,
840 static void ieee80211_if_setup(struct net_device *dev)
843 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
844 dev->netdev_ops = &ieee80211_dataif_ops;
845 dev->destructor = free_netdev;
848 static void ieee80211_iface_work(struct work_struct *work)
850 struct ieee80211_sub_if_data *sdata =
851 container_of(work, struct ieee80211_sub_if_data, work);
852 struct ieee80211_local *local = sdata->local;
854 struct sta_info *sta;
855 struct ieee80211_ra_tid *ra_tid;
857 if (!ieee80211_sdata_running(sdata))
864 * ieee80211_queue_work() should have picked up most cases,
865 * here we'll pick the rest.
867 if (WARN(local->suspended,
868 "interface work scheduled while going to suspend\n"))
871 /* first process frames */
872 while ((skb = skb_dequeue(&sdata->skb_queue))) {
873 struct ieee80211_mgmt *mgmt = (void *)skb->data;
875 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
876 ra_tid = (void *)&skb->cb;
877 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
879 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
880 ra_tid = (void *)&skb->cb;
881 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
883 } else if (ieee80211_is_action(mgmt->frame_control) &&
884 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
887 mutex_lock(&local->sta_mtx);
888 sta = sta_info_get_bss(sdata, mgmt->sa);
890 switch (mgmt->u.action.u.addba_req.action_code) {
891 case WLAN_ACTION_ADDBA_REQ:
892 ieee80211_process_addba_request(
893 local, sta, mgmt, len);
895 case WLAN_ACTION_ADDBA_RESP:
896 ieee80211_process_addba_resp(local, sta,
899 case WLAN_ACTION_DELBA:
900 ieee80211_process_delba(sdata, sta,
908 mutex_unlock(&local->sta_mtx);
909 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
910 struct ieee80211_hdr *hdr = (void *)mgmt;
912 * So the frame isn't mgmt, but frame_control
913 * is at the right place anyway, of course, so
914 * the if statement is correct.
916 * Warn if we have other data frame types here,
917 * they must not get here.
919 WARN_ON(hdr->frame_control &
920 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
921 WARN_ON(!(hdr->seq_ctrl &
922 cpu_to_le16(IEEE80211_SCTL_FRAG)));
924 * This was a fragment of a frame, received while
925 * a block-ack session was active. That cannot be
926 * right, so terminate the session.
928 mutex_lock(&local->sta_mtx);
929 sta = sta_info_get_bss(sdata, mgmt->sa);
931 u16 tid = *ieee80211_get_qos_ctl(hdr) &
932 IEEE80211_QOS_CTL_TID_MASK;
934 __ieee80211_stop_rx_ba_session(
935 sta, tid, WLAN_BACK_RECIPIENT,
936 WLAN_REASON_QSTA_REQUIRE_SETUP,
939 mutex_unlock(&local->sta_mtx);
940 } else switch (sdata->vif.type) {
941 case NL80211_IFTYPE_STATION:
942 ieee80211_sta_rx_queued_mgmt(sdata, skb);
944 case NL80211_IFTYPE_ADHOC:
945 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
947 case NL80211_IFTYPE_MESH_POINT:
948 if (!ieee80211_vif_is_mesh(&sdata->vif))
950 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
953 WARN(1, "frame for unexpected interface type");
960 /* then other type-dependent work */
961 switch (sdata->vif.type) {
962 case NL80211_IFTYPE_STATION:
963 ieee80211_sta_work(sdata);
965 case NL80211_IFTYPE_ADHOC:
966 ieee80211_ibss_work(sdata);
968 case NL80211_IFTYPE_MESH_POINT:
969 if (!ieee80211_vif_is_mesh(&sdata->vif))
971 ieee80211_mesh_work(sdata);
980 * Helper function to initialise an interface to a specific type.
982 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
983 enum nl80211_iftype type)
985 /* clear type-dependent union */
986 memset(&sdata->u, 0, sizeof(sdata->u));
988 /* and set some type-dependent values */
989 sdata->vif.type = type;
990 sdata->vif.p2p = false;
991 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
992 sdata->wdev.iftype = type;
994 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
995 sdata->control_port_no_encrypt = false;
997 sdata->noack_map = 0;
999 /* only monitor differs */
1000 sdata->dev->type = ARPHRD_ETHER;
1002 skb_queue_head_init(&sdata->skb_queue);
1003 INIT_WORK(&sdata->work, ieee80211_iface_work);
1006 case NL80211_IFTYPE_P2P_GO:
1007 type = NL80211_IFTYPE_AP;
1008 sdata->vif.type = type;
1009 sdata->vif.p2p = true;
1011 case NL80211_IFTYPE_AP:
1012 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1013 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1015 case NL80211_IFTYPE_P2P_CLIENT:
1016 type = NL80211_IFTYPE_STATION;
1017 sdata->vif.type = type;
1018 sdata->vif.p2p = true;
1020 case NL80211_IFTYPE_STATION:
1021 ieee80211_sta_setup_sdata(sdata);
1023 case NL80211_IFTYPE_ADHOC:
1024 ieee80211_ibss_setup_sdata(sdata);
1026 case NL80211_IFTYPE_MESH_POINT:
1027 if (ieee80211_vif_is_mesh(&sdata->vif))
1028 ieee80211_mesh_init_sdata(sdata);
1030 case NL80211_IFTYPE_MONITOR:
1031 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1032 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1033 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1034 MONITOR_FLAG_OTHER_BSS;
1036 case NL80211_IFTYPE_WDS:
1037 case NL80211_IFTYPE_AP_VLAN:
1039 case NL80211_IFTYPE_UNSPECIFIED:
1040 case NUM_NL80211_IFTYPES:
1045 ieee80211_debugfs_add_netdev(sdata);
1048 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1050 switch (sdata->vif.type) {
1051 case NL80211_IFTYPE_MESH_POINT:
1052 mesh_path_flush_by_iface(sdata);
1060 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1061 enum nl80211_iftype type)
1063 struct ieee80211_local *local = sdata->local;
1065 enum nl80211_iftype internal_type = type;
1070 if (!local->ops->change_interface)
1073 switch (sdata->vif.type) {
1074 case NL80211_IFTYPE_AP:
1075 case NL80211_IFTYPE_STATION:
1076 case NL80211_IFTYPE_ADHOC:
1078 * Could maybe also all others here?
1079 * Just not sure how that interacts
1080 * with the RX/config path e.g. for
1089 case NL80211_IFTYPE_AP:
1090 case NL80211_IFTYPE_STATION:
1091 case NL80211_IFTYPE_ADHOC:
1093 * Could probably support everything
1094 * but WDS here (WDS do_open can fail
1095 * under memory pressure, which this
1096 * code isn't prepared to handle).
1099 case NL80211_IFTYPE_P2P_CLIENT:
1101 internal_type = NL80211_IFTYPE_STATION;
1103 case NL80211_IFTYPE_P2P_GO:
1105 internal_type = NL80211_IFTYPE_AP;
1111 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1115 ieee80211_do_stop(sdata, false);
1117 ieee80211_teardown_sdata(sdata->dev);
1119 ret = drv_change_interface(local, sdata, internal_type, p2p);
1121 type = sdata->vif.type;
1124 * Ignore return value here, there's not much we can do since
1125 * the driver changed the interface type internally already.
1126 * The warnings will hopefully make driver authors fix it :-)
1128 ieee80211_check_queues(sdata);
1130 ieee80211_setup_sdata(sdata, type);
1132 err = ieee80211_do_open(sdata->dev, false);
1133 WARN(err, "type change: do_open returned %d", err);
1138 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1139 enum nl80211_iftype type)
1145 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1148 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1149 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1150 type == NL80211_IFTYPE_ADHOC)
1153 if (ieee80211_sdata_running(sdata)) {
1154 ret = ieee80211_runtime_change_iftype(sdata, type);
1158 /* Purge and reset type-dependent state. */
1159 ieee80211_teardown_sdata(sdata->dev);
1160 ieee80211_setup_sdata(sdata, type);
1163 /* reset some values that shouldn't be kept across type changes */
1164 sdata->vif.bss_conf.basic_rates =
1165 ieee80211_mandatory_rates(sdata->local,
1166 sdata->local->hw.conf.channel->band);
1167 sdata->drop_unencrypted = 0;
1168 if (type == NL80211_IFTYPE_STATION)
1169 sdata->u.mgd.use_4addr = false;
1174 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1175 struct net_device *dev,
1176 enum nl80211_iftype type)
1178 struct ieee80211_sub_if_data *sdata;
1179 u64 mask, start, addr, val, inc;
1181 u8 tmp_addr[ETH_ALEN];
1184 /* default ... something at least */
1185 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1187 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1188 local->hw.wiphy->n_addresses <= 1)
1192 mutex_lock(&local->iflist_mtx);
1195 case NL80211_IFTYPE_MONITOR:
1196 /* doesn't matter */
1198 case NL80211_IFTYPE_WDS:
1199 case NL80211_IFTYPE_AP_VLAN:
1200 /* match up with an AP interface */
1201 list_for_each_entry(sdata, &local->interfaces, list) {
1202 if (sdata->vif.type != NL80211_IFTYPE_AP)
1204 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1207 /* keep default if no AP interface present */
1210 /* assign a new address if possible -- try n_addresses first */
1211 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1214 list_for_each_entry(sdata, &local->interfaces, list) {
1215 if (memcmp(local->hw.wiphy->addresses[i].addr,
1216 sdata->vif.addr, ETH_ALEN) == 0) {
1223 memcpy(dev->perm_addr,
1224 local->hw.wiphy->addresses[i].addr,
1230 /* try mask if available */
1231 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1234 m = local->hw.wiphy->addr_mask;
1235 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1236 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1237 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1239 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1240 /* not a contiguous mask ... not handled now! */
1241 printk(KERN_DEBUG "not contiguous\n");
1245 m = local->hw.wiphy->perm_addr;
1246 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1247 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1248 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1250 inc = 1ULL<<__ffs64(mask);
1251 val = (start & mask);
1252 addr = (start & ~mask) | (val & mask);
1256 tmp_addr[5] = addr >> 0*8;
1257 tmp_addr[4] = addr >> 1*8;
1258 tmp_addr[3] = addr >> 2*8;
1259 tmp_addr[2] = addr >> 3*8;
1260 tmp_addr[1] = addr >> 4*8;
1261 tmp_addr[0] = addr >> 5*8;
1265 list_for_each_entry(sdata, &local->interfaces, list) {
1266 if (memcmp(tmp_addr, sdata->vif.addr,
1274 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1277 addr = (start & ~mask) | (val & mask);
1278 } while (addr != start);
1283 mutex_unlock(&local->iflist_mtx);
1286 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1287 struct net_device **new_dev, enum nl80211_iftype type,
1288 struct vif_params *params)
1290 struct net_device *ndev;
1291 struct ieee80211_sub_if_data *sdata = NULL;
1297 if (local->hw.queues >= IEEE80211_NUM_ACS)
1298 txqs = IEEE80211_NUM_ACS;
1300 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1301 name, ieee80211_if_setup, txqs, 1);
1304 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1306 ndev->needed_headroom = local->tx_headroom +
1307 4*6 /* four MAC addresses */
1308 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1310 + 8 /* rfc1042/bridge tunnel */
1311 - ETH_HLEN /* ethernet hard_header_len */
1312 + IEEE80211_ENCRYPT_HEADROOM;
1313 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1315 ret = dev_alloc_name(ndev, ndev->name);
1319 ieee80211_assign_perm_addr(local, ndev, type);
1320 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1321 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1323 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1324 sdata = netdev_priv(ndev);
1325 ndev->ieee80211_ptr = &sdata->wdev;
1326 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1327 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1329 /* initialise type-independent data */
1330 sdata->wdev.wiphy = local->hw.wiphy;
1331 sdata->local = local;
1334 sdata->arp_filter_state = true;
1337 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1338 skb_queue_head_init(&sdata->fragments[i].skb_list);
1340 INIT_LIST_HEAD(&sdata->key_list);
1342 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1343 struct ieee80211_supported_band *sband;
1344 sband = local->hw.wiphy->bands[i];
1345 sdata->rc_rateidx_mask[i] =
1346 sband ? (1 << sband->n_bitrates) - 1 : 0;
1348 memcpy(sdata->rc_rateidx_mcs_mask[i],
1349 sband->ht_cap.mcs.rx_mask,
1350 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1352 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1353 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1356 ieee80211_set_default_queues(sdata);
1358 /* setup type-dependent data */
1359 ieee80211_setup_sdata(sdata, type);
1362 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1363 if (type == NL80211_IFTYPE_STATION)
1364 sdata->u.mgd.use_4addr = params->use_4addr;
1367 ret = register_netdevice(ndev);
1371 mutex_lock(&local->iflist_mtx);
1372 list_add_tail_rcu(&sdata->list, &local->interfaces);
1373 mutex_unlock(&local->iflist_mtx);
1385 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1389 mutex_lock(&sdata->local->iflist_mtx);
1390 list_del_rcu(&sdata->list);
1391 mutex_unlock(&sdata->local->iflist_mtx);
1393 /* clean up type-dependent data */
1394 ieee80211_clean_sdata(sdata);
1397 unregister_netdevice(sdata->dev);
1401 * Remove all interfaces, may only be called at hardware unregistration
1402 * time because it doesn't do RCU-safe list removals.
1404 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1406 struct ieee80211_sub_if_data *sdata, *tmp;
1407 LIST_HEAD(unreg_list);
1411 mutex_lock(&local->iflist_mtx);
1412 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1413 list_del(&sdata->list);
1415 ieee80211_clean_sdata(sdata);
1417 unregister_netdevice_queue(sdata->dev, &unreg_list);
1419 mutex_unlock(&local->iflist_mtx);
1420 unregister_netdevice_many(&unreg_list);
1421 list_del(&unreg_list);
1424 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1427 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1430 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1431 wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1434 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1435 return IEEE80211_CONF_CHANGE_IDLE;
1438 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1440 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1443 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1444 wiphy_debug(local->hw.wiphy, "device now idle\n");
1447 drv_flush(local, false);
1449 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1450 return IEEE80211_CONF_CHANGE_IDLE;
1453 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1455 struct ieee80211_sub_if_data *sdata;
1457 bool working = false, scanning = false, hw_roc = false;
1458 struct ieee80211_work *wk;
1459 unsigned int led_trig_start = 0, led_trig_stop = 0;
1461 #ifdef CONFIG_PROVE_LOCKING
1462 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1463 !lockdep_is_held(&local->iflist_mtx));
1465 lockdep_assert_held(&local->mtx);
1467 list_for_each_entry(sdata, &local->interfaces, list) {
1468 if (!ieee80211_sdata_running(sdata)) {
1469 sdata->vif.bss_conf.idle = true;
1473 sdata->old_idle = sdata->vif.bss_conf.idle;
1475 /* do not count disabled managed interfaces */
1476 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1477 !sdata->u.mgd.associated &&
1478 !sdata->u.mgd.auth_data &&
1479 !sdata->u.mgd.assoc_data) {
1480 sdata->vif.bss_conf.idle = true;
1483 /* do not count unused IBSS interfaces */
1484 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1485 !sdata->u.ibss.ssid_len) {
1486 sdata->vif.bss_conf.idle = true;
1489 /* count everything else */
1490 sdata->vif.bss_conf.idle = false;
1494 list_for_each_entry(wk, &local->work_list, list) {
1496 wk->sdata->vif.bss_conf.idle = false;
1499 if (local->scan_sdata &&
1500 !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1502 local->scan_sdata->vif.bss_conf.idle = false;
1505 if (local->hw_roc_channel)
1508 list_for_each_entry(sdata, &local->interfaces, list) {
1509 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1510 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1512 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1514 if (!ieee80211_sdata_running(sdata))
1516 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1519 if (working || scanning || hw_roc)
1520 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1522 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1525 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1527 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1529 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1532 return ieee80211_idle_off(local, "hw remain-on-channel");
1534 return ieee80211_idle_off(local, "working");
1536 return ieee80211_idle_off(local, "scanning");
1538 return ieee80211_idle_on(local);
1540 return ieee80211_idle_off(local, "in use");
1545 void ieee80211_recalc_idle(struct ieee80211_local *local)
1549 mutex_lock(&local->iflist_mtx);
1550 chg = __ieee80211_recalc_idle(local);
1551 mutex_unlock(&local->iflist_mtx);
1553 ieee80211_hw_config(local, chg);
1556 static int netdev_notify(struct notifier_block *nb,
1557 unsigned long state,
1560 struct net_device *dev = ndev;
1561 struct ieee80211_sub_if_data *sdata;
1563 if (state != NETDEV_CHANGENAME)
1566 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1569 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1572 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1574 memcpy(sdata->name, dev->name, IFNAMSIZ);
1576 ieee80211_debugfs_rename_netdev(sdata);
1580 static struct notifier_block mac80211_netdev_notifier = {
1581 .notifier_call = netdev_notify,
1584 int ieee80211_iface_init(void)
1586 return register_netdevice_notifier(&mac80211_netdev_notifier);
1589 void ieee80211_iface_exit(void)
1591 unregister_netdevice_notifier(&mac80211_netdev_notifier);