9459aeee0ddc4da6cf655cb4c9f9391304f9cff7
[linux-2.6.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling (except master interface)
3  *
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>
8  *
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.
12  */
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"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27
28 /**
29  * DOC: Interface list locking
30  *
31  * The interface list in each struct ieee80211_local is protected
32  * three-fold:
33  *
34  * (1) modifications may only be done under the RTNL
35  * (2) modifications and readers are protected against each other by
36  *     the iflist_mtx.
37  * (3) modifications are done in an RCU manner so atomic readers
38  *     can traverse the list in RCU-safe blocks.
39  *
40  * As a consequence, reads (traversals) of the list can be protected
41  * by either the RTNL, the iflist_mtx or RCU.
42  */
43
44
45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
46 {
47         int meshhdrlen;
48         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
49
50         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
51
52         /* FIX: what would be proper limits for MTU?
53          * This interface uses 802.3 frames. */
54         if (new_mtu < 256 ||
55             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
56                 return -EINVAL;
57         }
58
59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
60         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
62         dev->mtu = new_mtu;
63         return 0;
64 }
65
66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
67 {
68         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
69         struct sockaddr *sa = addr;
70         int ret;
71
72         if (ieee80211_sdata_running(sdata))
73                 return -EBUSY;
74
75         ret = eth_mac_addr(dev, sa);
76
77         if (ret == 0)
78                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
79
80         return ret;
81 }
82
83 static inline int identical_mac_addr_allowed(int type1, int type2)
84 {
85         return type1 == NL80211_IFTYPE_MONITOR ||
86                 type2 == NL80211_IFTYPE_MONITOR ||
87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
88                 (type1 == NL80211_IFTYPE_WDS &&
89                         (type2 == NL80211_IFTYPE_WDS ||
90                          type2 == NL80211_IFTYPE_AP)) ||
91                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
92                 (type1 == NL80211_IFTYPE_AP_VLAN &&
93                         (type2 == NL80211_IFTYPE_AP ||
94                          type2 == NL80211_IFTYPE_AP_VLAN));
95 }
96
97 static int ieee80211_open(struct net_device *dev)
98 {
99         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
100         struct ieee80211_sub_if_data *nsdata;
101         struct ieee80211_local *local = sdata->local;
102         struct sta_info *sta;
103         u32 changed = 0;
104         int res;
105         u32 hw_reconf_flags = 0;
106         u8 null_addr[ETH_ALEN] = {0};
107
108         /* fail early if user set an invalid address */
109         if (compare_ether_addr(dev->dev_addr, null_addr) &&
110             !is_valid_ether_addr(dev->dev_addr))
111                 return -EADDRNOTAVAIL;
112
113         /* we hold the RTNL here so can safely walk the list */
114         list_for_each_entry(nsdata, &local->interfaces, list) {
115                 struct net_device *ndev = nsdata->dev;
116
117                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
118                         /*
119                          * Allow only a single IBSS interface to be up at any
120                          * time. This is restricted because beacon distribution
121                          * cannot work properly if both are in the same IBSS.
122                          *
123                          * To remove this restriction we'd have to disallow them
124                          * from setting the same SSID on different IBSS interfaces
125                          * belonging to the same hardware. Then, however, we're
126                          * faced with having to adopt two different TSF timers...
127                          */
128                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
129                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
130                                 return -EBUSY;
131
132                         /*
133                          * The remaining checks are only performed for interfaces
134                          * with the same MAC address.
135                          */
136                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
137                                 continue;
138
139                         /*
140                          * check whether it may have the same address
141                          */
142                         if (!identical_mac_addr_allowed(sdata->vif.type,
143                                                         nsdata->vif.type))
144                                 return -ENOTUNIQ;
145
146                         /*
147                          * can only add VLANs to enabled APs
148                          */
149                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
150                             nsdata->vif.type == NL80211_IFTYPE_AP)
151                                 sdata->bss = &nsdata->u.ap;
152                 }
153         }
154
155         switch (sdata->vif.type) {
156         case NL80211_IFTYPE_WDS:
157                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
158                         return -ENOLINK;
159                 break;
160         case NL80211_IFTYPE_AP_VLAN:
161                 if (!sdata->bss)
162                         return -ENOLINK;
163                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
164                 break;
165         case NL80211_IFTYPE_AP:
166                 sdata->bss = &sdata->u.ap;
167                 break;
168         case NL80211_IFTYPE_MESH_POINT:
169                 if (!ieee80211_vif_is_mesh(&sdata->vif))
170                         break;
171                 /* mesh ifaces must set allmulti to forward mcast traffic */
172                 atomic_inc(&local->iff_allmultis);
173                 break;
174         case NL80211_IFTYPE_STATION:
175         case NL80211_IFTYPE_MONITOR:
176         case NL80211_IFTYPE_ADHOC:
177                 /* no special treatment */
178                 break;
179         case NL80211_IFTYPE_UNSPECIFIED:
180         case __NL80211_IFTYPE_AFTER_LAST:
181                 /* cannot happen */
182                 WARN_ON(1);
183                 break;
184         }
185
186         if (local->open_count == 0) {
187                 res = drv_start(local);
188                 if (res)
189                         goto err_del_bss;
190                 if (local->ops->napi_poll)
191                         napi_enable(&local->napi);
192                 /* we're brought up, everything changes */
193                 hw_reconf_flags = ~0;
194                 ieee80211_led_radio(local, true);
195         }
196
197         /*
198          * Check all interfaces and copy the hopefully now-present
199          * MAC address to those that have the special null one.
200          */
201         list_for_each_entry(nsdata, &local->interfaces, list) {
202                 struct net_device *ndev = nsdata->dev;
203
204                 /*
205                  * No need to check running since we do not allow
206                  * it to start up with this invalid address.
207                  */
208                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
209                         memcpy(ndev->dev_addr,
210                                local->hw.wiphy->perm_addr,
211                                ETH_ALEN);
212                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
213                 }
214         }
215
216         /*
217          * Validate the MAC address for this device.
218          */
219         if (!is_valid_ether_addr(dev->dev_addr)) {
220                 if (!local->open_count)
221                         drv_stop(local);
222                 return -EADDRNOTAVAIL;
223         }
224
225         switch (sdata->vif.type) {
226         case NL80211_IFTYPE_AP_VLAN:
227                 /* no need to tell driver */
228                 break;
229         case NL80211_IFTYPE_MONITOR:
230                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
231                         local->cooked_mntrs++;
232                         break;
233                 }
234
235                 /* must be before the call to ieee80211_configure_filter */
236                 local->monitors++;
237                 if (local->monitors == 1) {
238                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
239                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
240                 }
241
242                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
243                         local->fif_fcsfail++;
244                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
245                         local->fif_plcpfail++;
246                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
247                         local->fif_control++;
248                         local->fif_pspoll++;
249                 }
250                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
251                         local->fif_other_bss++;
252
253                 ieee80211_configure_filter(local);
254
255                 netif_carrier_on(dev);
256                 break;
257         default:
258                 res = drv_add_interface(local, &sdata->vif);
259                 if (res)
260                         goto err_stop;
261
262                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
263                         local->fif_other_bss++;
264                         ieee80211_configure_filter(local);
265
266                         ieee80211_start_mesh(sdata);
267                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
268                         local->fif_pspoll++;
269
270                         ieee80211_configure_filter(local);
271                 }
272
273                 changed |= ieee80211_reset_erp_info(sdata);
274                 ieee80211_bss_info_change_notify(sdata, changed);
275
276                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
277                         netif_carrier_off(dev);
278                 else
279                         netif_carrier_on(dev);
280         }
281
282         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
283                 /* Create STA entry for the WDS peer */
284                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
285                                      GFP_KERNEL);
286                 if (!sta) {
287                         res = -ENOMEM;
288                         goto err_del_interface;
289                 }
290
291                 /* no locking required since STA is not live yet */
292                 sta->flags |= WLAN_STA_AUTHORIZED;
293
294                 res = sta_info_insert(sta);
295                 if (res) {
296                         /* STA has been freed */
297                         goto err_del_interface;
298                 }
299         }
300
301         /*
302          * set_multicast_list will be invoked by the networking core
303          * which will check whether any increments here were done in
304          * error and sync them down to the hardware as filter flags.
305          */
306         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
307                 atomic_inc(&local->iff_allmultis);
308
309         if (sdata->flags & IEEE80211_SDATA_PROMISC)
310                 atomic_inc(&local->iff_promiscs);
311
312         mutex_lock(&local->mtx);
313         hw_reconf_flags |= __ieee80211_recalc_idle(local);
314         mutex_unlock(&local->mtx);
315
316         local->open_count++;
317         if (hw_reconf_flags) {
318                 ieee80211_hw_config(local, hw_reconf_flags);
319                 /*
320                  * set default queue parameters so drivers don't
321                  * need to initialise the hardware if the hardware
322                  * doesn't start up with sane defaults
323                  */
324                 ieee80211_set_wmm_default(sdata);
325         }
326
327         ieee80211_recalc_ps(local, -1);
328
329         netif_tx_start_all_queues(dev);
330
331         return 0;
332  err_del_interface:
333         drv_remove_interface(local, &sdata->vif);
334  err_stop:
335         if (!local->open_count)
336                 drv_stop(local);
337  err_del_bss:
338         sdata->bss = NULL;
339         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
340                 list_del(&sdata->u.vlan.list);
341         return res;
342 }
343
344 static int ieee80211_stop(struct net_device *dev)
345 {
346         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
347         struct ieee80211_local *local = sdata->local;
348         unsigned long flags;
349         struct sk_buff *skb, *tmp;
350         u32 hw_reconf_flags = 0;
351         int i;
352
353         /*
354          * Stop TX on this interface first.
355          */
356         netif_tx_stop_all_queues(dev);
357
358         /*
359          * Purge work for this interface.
360          */
361         ieee80211_work_purge(sdata);
362
363         /*
364          * Remove all stations associated with this interface.
365          *
366          * This must be done before calling ops->remove_interface()
367          * because otherwise we can later invoke ops->sta_notify()
368          * whenever the STAs are removed, and that invalidates driver
369          * assumptions about always getting a vif pointer that is valid
370          * (because if we remove a STA after ops->remove_interface()
371          * the driver will have removed the vif info already!)
372          *
373          * We could relax this and only unlink the stations from the
374          * hash table and list but keep them on a per-sdata list that
375          * will be inserted back again when the interface is brought
376          * up again, but I don't currently see a use case for that,
377          * except with WDS which gets a STA entry created when it is
378          * brought up.
379          */
380         sta_info_flush(local, sdata);
381
382         /*
383          * Don't count this interface for promisc/allmulti while it
384          * is down. dev_mc_unsync() will invoke set_multicast_list
385          * on the master interface which will sync these down to the
386          * hardware as filter flags.
387          */
388         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
389                 atomic_dec(&local->iff_allmultis);
390
391         if (sdata->flags & IEEE80211_SDATA_PROMISC)
392                 atomic_dec(&local->iff_promiscs);
393
394         if (sdata->vif.type == NL80211_IFTYPE_AP)
395                 local->fif_pspoll--;
396
397         netif_addr_lock_bh(dev);
398         spin_lock_bh(&local->filter_lock);
399         __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
400         spin_unlock_bh(&local->filter_lock);
401         netif_addr_unlock_bh(dev);
402
403         ieee80211_configure_filter(local);
404
405         del_timer_sync(&local->dynamic_ps_timer);
406         cancel_work_sync(&local->dynamic_ps_enable_work);
407
408         /* APs need special treatment */
409         if (sdata->vif.type == NL80211_IFTYPE_AP) {
410                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
411                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
412
413                 /* remove beacon */
414                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
415                 synchronize_rcu();
416                 kfree(old_beacon);
417
418                 /* down all dependent devices, that is VLANs */
419                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
420                                          u.vlan.list)
421                         dev_close(vlan->dev);
422                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
423         }
424
425         local->open_count--;
426
427         switch (sdata->vif.type) {
428         case NL80211_IFTYPE_AP_VLAN:
429                 list_del(&sdata->u.vlan.list);
430                 /* no need to tell driver */
431                 break;
432         case NL80211_IFTYPE_MONITOR:
433                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
434                         local->cooked_mntrs--;
435                         break;
436                 }
437
438                 local->monitors--;
439                 if (local->monitors == 0) {
440                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
441                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
442                 }
443
444                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
445                         local->fif_fcsfail--;
446                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
447                         local->fif_plcpfail--;
448                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
449                         local->fif_pspoll--;
450                         local->fif_control--;
451                 }
452                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
453                         local->fif_other_bss--;
454
455                 ieee80211_configure_filter(local);
456                 break;
457         case NL80211_IFTYPE_STATION:
458                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
459                 del_timer_sync(&sdata->u.mgd.timer);
460                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
461                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
462                 /*
463                  * If any of the timers fired while we waited for it, it will
464                  * have queued its work. Now the work will be running again
465                  * but will not rearm the timer again because it checks
466                  * whether the interface is running, which, at this point,
467                  * it no longer is.
468                  */
469                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
470                 cancel_work_sync(&sdata->u.mgd.monitor_work);
471                 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
472
473                 /* fall through */
474         case NL80211_IFTYPE_ADHOC:
475                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
476                         del_timer_sync(&sdata->u.ibss.timer);
477                 /* fall through */
478         case NL80211_IFTYPE_MESH_POINT:
479                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
480                         /* other_bss and allmulti are always set on mesh
481                          * ifaces */
482                         local->fif_other_bss--;
483                         atomic_dec(&local->iff_allmultis);
484
485                         ieee80211_configure_filter(local);
486
487                         ieee80211_stop_mesh(sdata);
488                 }
489                 /* fall through */
490         default:
491                 flush_work(&sdata->work);
492                 /*
493                  * When we get here, the interface is marked down.
494                  * Call synchronize_rcu() to wait for the RX path
495                  * should it be using the interface and enqueuing
496                  * frames at this very time on another CPU.
497                  */
498                 synchronize_rcu();
499                 skb_queue_purge(&sdata->skb_queue);
500
501                 if (local->scan_sdata == sdata)
502                         ieee80211_scan_cancel(local);
503
504                 /*
505                  * Disable beaconing for AP and mesh, IBSS can't
506                  * still be joined to a network at this point.
507                  */
508                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
509                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
510                         ieee80211_bss_info_change_notify(sdata,
511                                 BSS_CHANGED_BEACON_ENABLED);
512                 }
513
514                 /* free all remaining keys, there shouldn't be any */
515                 ieee80211_free_keys(sdata);
516                 drv_remove_interface(local, &sdata->vif);
517         }
518
519         sdata->bss = NULL;
520
521         mutex_lock(&local->mtx);
522         hw_reconf_flags |= __ieee80211_recalc_idle(local);
523         mutex_unlock(&local->mtx);
524
525         ieee80211_recalc_ps(local, -1);
526
527         if (local->open_count == 0) {
528                 if (local->ops->napi_poll)
529                         napi_disable(&local->napi);
530                 ieee80211_clear_tx_pending(local);
531                 ieee80211_stop_device(local);
532
533                 /* no reconfiguring after stop! */
534                 hw_reconf_flags = 0;
535         }
536
537         /* do after stop to avoid reconfiguring when we stop anyway */
538         if (hw_reconf_flags)
539                 ieee80211_hw_config(local, hw_reconf_flags);
540
541         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
542         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
543                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
544                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
545                         if (info->control.vif == &sdata->vif) {
546                                 __skb_unlink(skb, &local->pending[i]);
547                                 dev_kfree_skb_irq(skb);
548                         }
549                 }
550         }
551         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
552
553         return 0;
554 }
555
556 static void ieee80211_set_multicast_list(struct net_device *dev)
557 {
558         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
559         struct ieee80211_local *local = sdata->local;
560         int allmulti, promisc, sdata_allmulti, sdata_promisc;
561
562         allmulti = !!(dev->flags & IFF_ALLMULTI);
563         promisc = !!(dev->flags & IFF_PROMISC);
564         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
565         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
566
567         if (allmulti != sdata_allmulti) {
568                 if (dev->flags & IFF_ALLMULTI)
569                         atomic_inc(&local->iff_allmultis);
570                 else
571                         atomic_dec(&local->iff_allmultis);
572                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
573         }
574
575         if (promisc != sdata_promisc) {
576                 if (dev->flags & IFF_PROMISC)
577                         atomic_inc(&local->iff_promiscs);
578                 else
579                         atomic_dec(&local->iff_promiscs);
580                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
581         }
582         spin_lock_bh(&local->filter_lock);
583         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
584         spin_unlock_bh(&local->filter_lock);
585         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
586 }
587
588 /*
589  * Called when the netdev is removed or, by the code below, before
590  * the interface type changes.
591  */
592 static void ieee80211_teardown_sdata(struct net_device *dev)
593 {
594         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
595         struct ieee80211_local *local = sdata->local;
596         struct beacon_data *beacon;
597         struct sk_buff *skb;
598         int flushed;
599         int i;
600
601         /* free extra data */
602         ieee80211_free_keys(sdata);
603
604         ieee80211_debugfs_remove_netdev(sdata);
605
606         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
607                 __skb_queue_purge(&sdata->fragments[i].skb_list);
608         sdata->fragment_next = 0;
609
610         switch (sdata->vif.type) {
611         case NL80211_IFTYPE_AP:
612                 beacon = sdata->u.ap.beacon;
613                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
614                 synchronize_rcu();
615                 kfree(beacon);
616
617                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
618                         local->total_ps_buffered--;
619                         dev_kfree_skb(skb);
620                 }
621
622                 break;
623         case NL80211_IFTYPE_MESH_POINT:
624                 if (ieee80211_vif_is_mesh(&sdata->vif))
625                         mesh_rmc_free(sdata);
626                 break;
627         case NL80211_IFTYPE_ADHOC:
628                 if (WARN_ON(sdata->u.ibss.presp))
629                         kfree_skb(sdata->u.ibss.presp);
630                 break;
631         case NL80211_IFTYPE_STATION:
632         case NL80211_IFTYPE_WDS:
633         case NL80211_IFTYPE_AP_VLAN:
634         case NL80211_IFTYPE_MONITOR:
635                 break;
636         case NL80211_IFTYPE_UNSPECIFIED:
637         case __NL80211_IFTYPE_AFTER_LAST:
638                 BUG();
639                 break;
640         }
641
642         flushed = sta_info_flush(local, sdata);
643         WARN_ON(flushed);
644 }
645
646 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
647                                          struct sk_buff *skb)
648 {
649         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
650 }
651
652 static const struct net_device_ops ieee80211_dataif_ops = {
653         .ndo_open               = ieee80211_open,
654         .ndo_stop               = ieee80211_stop,
655         .ndo_uninit             = ieee80211_teardown_sdata,
656         .ndo_start_xmit         = ieee80211_subif_start_xmit,
657         .ndo_set_multicast_list = ieee80211_set_multicast_list,
658         .ndo_change_mtu         = ieee80211_change_mtu,
659         .ndo_set_mac_address    = ieee80211_change_mac,
660         .ndo_select_queue       = ieee80211_netdev_select_queue,
661 };
662
663 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
664                                           struct sk_buff *skb)
665 {
666         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
667         struct ieee80211_local *local = sdata->local;
668         struct ieee80211_hdr *hdr;
669         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
670         u8 *p;
671
672         if (local->hw.queues < 4)
673                 return 0;
674
675         if (skb->len < 4 ||
676             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
677                 return 0; /* doesn't matter, frame will be dropped */
678
679         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
680
681         if (!ieee80211_is_data(hdr->frame_control)) {
682                 skb->priority = 7;
683                 return ieee802_1d_to_ac[skb->priority];
684         }
685         if (!ieee80211_is_data_qos(hdr->frame_control)) {
686                 skb->priority = 0;
687                 return ieee802_1d_to_ac[skb->priority];
688         }
689
690         p = ieee80211_get_qos_ctl(hdr);
691         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
692
693         return ieee80211_downgrade_queue(local, skb);
694 }
695
696 static const struct net_device_ops ieee80211_monitorif_ops = {
697         .ndo_open               = ieee80211_open,
698         .ndo_stop               = ieee80211_stop,
699         .ndo_uninit             = ieee80211_teardown_sdata,
700         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
701         .ndo_set_multicast_list = ieee80211_set_multicast_list,
702         .ndo_change_mtu         = ieee80211_change_mtu,
703         .ndo_set_mac_address    = eth_mac_addr,
704         .ndo_select_queue       = ieee80211_monitor_select_queue,
705 };
706
707 static void ieee80211_if_setup(struct net_device *dev)
708 {
709         ether_setup(dev);
710         dev->netdev_ops = &ieee80211_dataif_ops;
711         dev->destructor = free_netdev;
712 }
713
714 static void ieee80211_iface_work(struct work_struct *work)
715 {
716         struct ieee80211_sub_if_data *sdata =
717                 container_of(work, struct ieee80211_sub_if_data, work);
718         struct ieee80211_local *local = sdata->local;
719         struct sk_buff *skb;
720         struct sta_info *sta;
721         struct ieee80211_ra_tid *ra_tid;
722
723         if (!ieee80211_sdata_running(sdata))
724                 return;
725
726         if (local->scanning)
727                 return;
728
729         /*
730          * ieee80211_queue_work() should have picked up most cases,
731          * here we'll pick the rest.
732          */
733         if (WARN(local->suspended,
734                  "interface work scheduled while going to suspend\n"))
735                 return;
736
737         /* first process frames */
738         while ((skb = skb_dequeue(&sdata->skb_queue))) {
739                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
740
741                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
742                         ra_tid = (void *)&skb->cb;
743                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
744                                                  ra_tid->tid);
745                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
746                         ra_tid = (void *)&skb->cb;
747                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
748                                                 ra_tid->tid);
749                 } else if (ieee80211_is_action(mgmt->frame_control) &&
750                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
751                         int len = skb->len;
752
753                         mutex_lock(&local->sta_mtx);
754                         sta = sta_info_get_bss(sdata, mgmt->sa);
755                         if (sta) {
756                                 switch (mgmt->u.action.u.addba_req.action_code) {
757                                 case WLAN_ACTION_ADDBA_REQ:
758                                         ieee80211_process_addba_request(
759                                                         local, sta, mgmt, len);
760                                         break;
761                                 case WLAN_ACTION_ADDBA_RESP:
762                                         ieee80211_process_addba_resp(local, sta,
763                                                                      mgmt, len);
764                                         break;
765                                 case WLAN_ACTION_DELBA:
766                                         ieee80211_process_delba(sdata, sta,
767                                                                 mgmt, len);
768                                         break;
769                                 default:
770                                         WARN_ON(1);
771                                         break;
772                                 }
773                         }
774                         mutex_unlock(&local->sta_mtx);
775                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
776                         struct ieee80211_hdr *hdr = (void *)mgmt;
777                         /*
778                          * So the frame isn't mgmt, but frame_control
779                          * is at the right place anyway, of course, so
780                          * the if statement is correct.
781                          *
782                          * Warn if we have other data frame types here,
783                          * they must not get here.
784                          */
785                         WARN_ON(hdr->frame_control &
786                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
787                         WARN_ON(!(hdr->seq_ctrl &
788                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
789                         /*
790                          * This was a fragment of a frame, received while
791                          * a block-ack session was active. That cannot be
792                          * right, so terminate the session.
793                          */
794                         mutex_lock(&local->sta_mtx);
795                         sta = sta_info_get_bss(sdata, mgmt->sa);
796                         if (sta) {
797                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
798                                                 IEEE80211_QOS_CTL_TID_MASK;
799
800                                 __ieee80211_stop_rx_ba_session(
801                                         sta, tid, WLAN_BACK_RECIPIENT,
802                                         WLAN_REASON_QSTA_REQUIRE_SETUP);
803                         }
804                         mutex_unlock(&local->sta_mtx);
805                 } else switch (sdata->vif.type) {
806                 case NL80211_IFTYPE_STATION:
807                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
808                         break;
809                 case NL80211_IFTYPE_ADHOC:
810                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
811                         break;
812                 case NL80211_IFTYPE_MESH_POINT:
813                         if (!ieee80211_vif_is_mesh(&sdata->vif))
814                                 break;
815                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
816                         break;
817                 default:
818                         WARN(1, "frame for unexpected interface type");
819                         break;
820                 }
821
822                 kfree_skb(skb);
823         }
824
825         /* then other type-dependent work */
826         switch (sdata->vif.type) {
827         case NL80211_IFTYPE_STATION:
828                 ieee80211_sta_work(sdata);
829                 break;
830         case NL80211_IFTYPE_ADHOC:
831                 ieee80211_ibss_work(sdata);
832                 break;
833         case NL80211_IFTYPE_MESH_POINT:
834                 if (!ieee80211_vif_is_mesh(&sdata->vif))
835                         break;
836                 ieee80211_mesh_work(sdata);
837                 break;
838         default:
839                 break;
840         }
841 }
842
843
844 /*
845  * Helper function to initialise an interface to a specific type.
846  */
847 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
848                                   enum nl80211_iftype type)
849 {
850         /* clear type-dependent union */
851         memset(&sdata->u, 0, sizeof(sdata->u));
852
853         /* and set some type-dependent values */
854         sdata->vif.type = type;
855         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
856         sdata->wdev.iftype = type;
857
858         /* only monitor differs */
859         sdata->dev->type = ARPHRD_ETHER;
860
861         skb_queue_head_init(&sdata->skb_queue);
862         INIT_WORK(&sdata->work, ieee80211_iface_work);
863
864         switch (type) {
865         case NL80211_IFTYPE_AP:
866                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
867                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
868                 break;
869         case NL80211_IFTYPE_STATION:
870                 ieee80211_sta_setup_sdata(sdata);
871                 break;
872         case NL80211_IFTYPE_ADHOC:
873                 ieee80211_ibss_setup_sdata(sdata);
874                 break;
875         case NL80211_IFTYPE_MESH_POINT:
876                 if (ieee80211_vif_is_mesh(&sdata->vif))
877                         ieee80211_mesh_init_sdata(sdata);
878                 break;
879         case NL80211_IFTYPE_MONITOR:
880                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
881                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
882                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
883                                       MONITOR_FLAG_OTHER_BSS;
884                 break;
885         case NL80211_IFTYPE_WDS:
886         case NL80211_IFTYPE_AP_VLAN:
887                 break;
888         case NL80211_IFTYPE_UNSPECIFIED:
889         case __NL80211_IFTYPE_AFTER_LAST:
890                 BUG();
891                 break;
892         }
893
894         ieee80211_debugfs_add_netdev(sdata);
895 }
896
897 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
898                              enum nl80211_iftype type)
899 {
900         ASSERT_RTNL();
901
902         if (type == sdata->vif.type)
903                 return 0;
904
905         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
906         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
907             type == NL80211_IFTYPE_ADHOC)
908                 return -EOPNOTSUPP;
909
910         /*
911          * We could, here, on changes between IBSS/STA/MESH modes,
912          * invoke an MLME function instead that disassociates etc.
913          * and goes into the requested mode.
914          */
915
916         if (ieee80211_sdata_running(sdata))
917                 return -EBUSY;
918
919         /* Purge and reset type-dependent state. */
920         ieee80211_teardown_sdata(sdata->dev);
921         ieee80211_setup_sdata(sdata, type);
922
923         /* reset some values that shouldn't be kept across type changes */
924         sdata->vif.bss_conf.basic_rates =
925                 ieee80211_mandatory_rates(sdata->local,
926                         sdata->local->hw.conf.channel->band);
927         sdata->drop_unencrypted = 0;
928         if (type == NL80211_IFTYPE_STATION)
929                 sdata->u.mgd.use_4addr = false;
930
931         return 0;
932 }
933
934 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
935                                        struct net_device *dev,
936                                        enum nl80211_iftype type)
937 {
938         struct ieee80211_sub_if_data *sdata;
939         u64 mask, start, addr, val, inc;
940         u8 *m;
941         u8 tmp_addr[ETH_ALEN];
942         int i;
943
944         /* default ... something at least */
945         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
946
947         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
948             local->hw.wiphy->n_addresses <= 1)
949                 return;
950
951
952         mutex_lock(&local->iflist_mtx);
953
954         switch (type) {
955         case NL80211_IFTYPE_MONITOR:
956                 /* doesn't matter */
957                 break;
958         case NL80211_IFTYPE_WDS:
959         case NL80211_IFTYPE_AP_VLAN:
960                 /* match up with an AP interface */
961                 list_for_each_entry(sdata, &local->interfaces, list) {
962                         if (sdata->vif.type != NL80211_IFTYPE_AP)
963                                 continue;
964                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
965                         break;
966                 }
967                 /* keep default if no AP interface present */
968                 break;
969         default:
970                 /* assign a new address if possible -- try n_addresses first */
971                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
972                         bool used = false;
973
974                         list_for_each_entry(sdata, &local->interfaces, list) {
975                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
976                                            sdata->vif.addr, ETH_ALEN) == 0) {
977                                         used = true;
978                                         break;
979                                 }
980                         }
981
982                         if (!used) {
983                                 memcpy(dev->perm_addr,
984                                        local->hw.wiphy->addresses[i].addr,
985                                        ETH_ALEN);
986                                 break;
987                         }
988                 }
989
990                 /* try mask if available */
991                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
992                         break;
993
994                 m = local->hw.wiphy->addr_mask;
995                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
996                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
997                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
998
999                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1000                         /* not a contiguous mask ... not handled now! */
1001                         printk(KERN_DEBUG "not contiguous\n");
1002                         break;
1003                 }
1004
1005                 m = local->hw.wiphy->perm_addr;
1006                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1007                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1008                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1009
1010                 inc = 1ULL<<__ffs64(mask);
1011                 val = (start & mask);
1012                 addr = (start & ~mask) | (val & mask);
1013                 do {
1014                         bool used = false;
1015
1016                         tmp_addr[5] = addr >> 0*8;
1017                         tmp_addr[4] = addr >> 1*8;
1018                         tmp_addr[3] = addr >> 2*8;
1019                         tmp_addr[2] = addr >> 3*8;
1020                         tmp_addr[1] = addr >> 4*8;
1021                         tmp_addr[0] = addr >> 5*8;
1022
1023                         val += inc;
1024
1025                         list_for_each_entry(sdata, &local->interfaces, list) {
1026                                 if (memcmp(tmp_addr, sdata->vif.addr,
1027                                                         ETH_ALEN) == 0) {
1028                                         used = true;
1029                                         break;
1030                                 }
1031                         }
1032
1033                         if (!used) {
1034                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1035                                 break;
1036                         }
1037                         addr = (start & ~mask) | (val & mask);
1038                 } while (addr != start);
1039
1040                 break;
1041         }
1042
1043         mutex_unlock(&local->iflist_mtx);
1044 }
1045
1046 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1047                      struct net_device **new_dev, enum nl80211_iftype type,
1048                      struct vif_params *params)
1049 {
1050         struct net_device *ndev;
1051         struct ieee80211_sub_if_data *sdata = NULL;
1052         int ret, i;
1053
1054         ASSERT_RTNL();
1055
1056         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1057                                name, ieee80211_if_setup, local->hw.queues);
1058         if (!ndev)
1059                 return -ENOMEM;
1060         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1061
1062         ndev->needed_headroom = local->tx_headroom +
1063                                 4*6 /* four MAC addresses */
1064                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1065                                 + 6 /* mesh */
1066                                 + 8 /* rfc1042/bridge tunnel */
1067                                 - ETH_HLEN /* ethernet hard_header_len */
1068                                 + IEEE80211_ENCRYPT_HEADROOM;
1069         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1070
1071         ret = dev_alloc_name(ndev, ndev->name);
1072         if (ret < 0)
1073                 goto fail;
1074
1075         ieee80211_assign_perm_addr(local, ndev, type);
1076         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1077         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1078
1079         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1080         sdata = netdev_priv(ndev);
1081         ndev->ieee80211_ptr = &sdata->wdev;
1082         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1083         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1084
1085         /* initialise type-independent data */
1086         sdata->wdev.wiphy = local->hw.wiphy;
1087         sdata->local = local;
1088         sdata->dev = ndev;
1089 #ifdef CONFIG_INET
1090         sdata->arp_filter_state = true;
1091 #endif
1092
1093         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1094                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1095
1096         INIT_LIST_HEAD(&sdata->key_list);
1097
1098         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1099                 struct ieee80211_supported_band *sband;
1100                 sband = local->hw.wiphy->bands[i];
1101                 sdata->rc_rateidx_mask[i] =
1102                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1103         }
1104
1105         /* setup type-dependent data */
1106         ieee80211_setup_sdata(sdata, type);
1107
1108         if (params) {
1109                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1110                 if (type == NL80211_IFTYPE_STATION)
1111                         sdata->u.mgd.use_4addr = params->use_4addr;
1112         }
1113
1114         ret = register_netdevice(ndev);
1115         if (ret)
1116                 goto fail;
1117
1118         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1119             params && params->mesh_id_len)
1120                 ieee80211_sdata_set_mesh_id(sdata,
1121                                             params->mesh_id_len,
1122                                             params->mesh_id);
1123
1124         mutex_lock(&local->iflist_mtx);
1125         list_add_tail_rcu(&sdata->list, &local->interfaces);
1126         mutex_unlock(&local->iflist_mtx);
1127
1128         if (new_dev)
1129                 *new_dev = ndev;
1130
1131         return 0;
1132
1133  fail:
1134         free_netdev(ndev);
1135         return ret;
1136 }
1137
1138 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1139 {
1140         ASSERT_RTNL();
1141
1142         mutex_lock(&sdata->local->iflist_mtx);
1143         list_del_rcu(&sdata->list);
1144         mutex_unlock(&sdata->local->iflist_mtx);
1145
1146         synchronize_rcu();
1147         unregister_netdevice(sdata->dev);
1148 }
1149
1150 /*
1151  * Remove all interfaces, may only be called at hardware unregistration
1152  * time because it doesn't do RCU-safe list removals.
1153  */
1154 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1155 {
1156         struct ieee80211_sub_if_data *sdata, *tmp;
1157         LIST_HEAD(unreg_list);
1158
1159         ASSERT_RTNL();
1160
1161         mutex_lock(&local->iflist_mtx);
1162         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1163                 list_del(&sdata->list);
1164
1165                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1166         }
1167         mutex_unlock(&local->iflist_mtx);
1168         unregister_netdevice_many(&unreg_list);
1169 }
1170
1171 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1172                               const char *reason)
1173 {
1174         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1175                 return 0;
1176
1177 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1178         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1179                wiphy_name(local->hw.wiphy), reason);
1180 #endif
1181
1182         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1183         return IEEE80211_CONF_CHANGE_IDLE;
1184 }
1185
1186 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1187 {
1188         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1189                 return 0;
1190
1191 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1192         printk(KERN_DEBUG "%s: device now idle\n",
1193                wiphy_name(local->hw.wiphy));
1194 #endif
1195
1196         drv_flush(local, false);
1197
1198         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1199         return IEEE80211_CONF_CHANGE_IDLE;
1200 }
1201
1202 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1203 {
1204         struct ieee80211_sub_if_data *sdata;
1205         int count = 0;
1206         bool working = false, scanning = false;
1207         struct ieee80211_work *wk;
1208
1209 #ifdef CONFIG_PROVE_LOCKING
1210         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1211                 !lockdep_is_held(&local->iflist_mtx));
1212 #endif
1213         lockdep_assert_held(&local->mtx);
1214
1215         list_for_each_entry(sdata, &local->interfaces, list) {
1216                 if (!ieee80211_sdata_running(sdata)) {
1217                         sdata->vif.bss_conf.idle = true;
1218                         continue;
1219                 }
1220
1221                 sdata->old_idle = sdata->vif.bss_conf.idle;
1222
1223                 /* do not count disabled managed interfaces */
1224                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1225                     !sdata->u.mgd.associated) {
1226                         sdata->vif.bss_conf.idle = true;
1227                         continue;
1228                 }
1229                 /* do not count unused IBSS interfaces */
1230                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1231                     !sdata->u.ibss.ssid_len) {
1232                         sdata->vif.bss_conf.idle = true;
1233                         continue;
1234                 }
1235                 /* count everything else */
1236                 count++;
1237         }
1238
1239         list_for_each_entry(wk, &local->work_list, list) {
1240                 working = true;
1241                 wk->sdata->vif.bss_conf.idle = false;
1242         }
1243
1244         if (local->scan_sdata) {
1245                 scanning = true;
1246                 local->scan_sdata->vif.bss_conf.idle = false;
1247         }
1248
1249         list_for_each_entry(sdata, &local->interfaces, list) {
1250                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1251                         continue;
1252                 if (!ieee80211_sdata_running(sdata))
1253                         continue;
1254                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1255         }
1256
1257         if (working)
1258                 return ieee80211_idle_off(local, "working");
1259         if (scanning)
1260                 return ieee80211_idle_off(local, "scanning");
1261         if (!count)
1262                 return ieee80211_idle_on(local);
1263         else
1264                 return ieee80211_idle_off(local, "in use");
1265
1266         return 0;
1267 }
1268
1269 void ieee80211_recalc_idle(struct ieee80211_local *local)
1270 {
1271         u32 chg;
1272
1273         mutex_lock(&local->iflist_mtx);
1274         chg = __ieee80211_recalc_idle(local);
1275         mutex_unlock(&local->iflist_mtx);
1276         if (chg)
1277                 ieee80211_hw_config(local, chg);
1278 }
1279
1280 static int netdev_notify(struct notifier_block *nb,
1281                          unsigned long state,
1282                          void *ndev)
1283 {
1284         struct net_device *dev = ndev;
1285         struct ieee80211_sub_if_data *sdata;
1286
1287         if (state != NETDEV_CHANGENAME)
1288                 return 0;
1289
1290         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1291                 return 0;
1292
1293         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1294                 return 0;
1295
1296         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1297
1298         memcpy(sdata->name, dev->name, IFNAMSIZ);
1299
1300         ieee80211_debugfs_rename_netdev(sdata);
1301         return 0;
1302 }
1303
1304 static struct notifier_block mac80211_netdev_notifier = {
1305         .notifier_call = netdev_notify,
1306 };
1307
1308 int ieee80211_iface_init(void)
1309 {
1310         return register_netdevice_notifier(&mac80211_netdev_notifier);
1311 }
1312
1313 void ieee80211_iface_exit(void)
1314 {
1315         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1316 }