mac80211: allow using network namespaces
[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/kernel.h>
14 #include <linux/if_arp.h>
15 #include <linux/netdevice.h>
16 #include <linux/rtnetlink.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "sta_info.h"
20 #include "debugfs_netdev.h"
21 #include "mesh.h"
22 #include "led.h"
23 #include "driver-ops.h"
24
25 /**
26  * DOC: Interface list locking
27  *
28  * The interface list in each struct ieee80211_local is protected
29  * three-fold:
30  *
31  * (1) modifications may only be done under the RTNL
32  * (2) modifications and readers are protected against each other by
33  *     the iflist_mtx.
34  * (3) modifications are done in an RCU manner so atomic readers
35  *     can traverse the list in RCU-safe blocks.
36  *
37  * As a consequence, reads (traversals) of the list can be protected
38  * by either the RTNL, the iflist_mtx or RCU.
39  */
40
41
42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
43 {
44         int meshhdrlen;
45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
46
47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
48
49         /* FIX: what would be proper limits for MTU?
50          * This interface uses 802.3 frames. */
51         if (new_mtu < 256 ||
52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
53                 return -EINVAL;
54         }
55
56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
59         dev->mtu = new_mtu;
60         return 0;
61 }
62
63 static inline int identical_mac_addr_allowed(int type1, int type2)
64 {
65         return type1 == NL80211_IFTYPE_MONITOR ||
66                 type2 == NL80211_IFTYPE_MONITOR ||
67                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
68                 (type1 == NL80211_IFTYPE_WDS &&
69                         (type2 == NL80211_IFTYPE_WDS ||
70                          type2 == NL80211_IFTYPE_AP)) ||
71                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
72                 (type1 == NL80211_IFTYPE_AP_VLAN &&
73                         (type2 == NL80211_IFTYPE_AP ||
74                          type2 == NL80211_IFTYPE_AP_VLAN));
75 }
76
77 static int ieee80211_open(struct net_device *dev)
78 {
79         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
80         struct ieee80211_sub_if_data *nsdata;
81         struct ieee80211_local *local = sdata->local;
82         struct sta_info *sta;
83         struct ieee80211_if_init_conf conf;
84         u32 changed = 0;
85         int res;
86         u32 hw_reconf_flags = 0;
87         u8 null_addr[ETH_ALEN] = {0};
88
89         /* fail early if user set an invalid address */
90         if (compare_ether_addr(dev->dev_addr, null_addr) &&
91             !is_valid_ether_addr(dev->dev_addr))
92                 return -EADDRNOTAVAIL;
93
94         /* we hold the RTNL here so can safely walk the list */
95         list_for_each_entry(nsdata, &local->interfaces, list) {
96                 struct net_device *ndev = nsdata->dev;
97
98                 if (ndev != dev && netif_running(ndev)) {
99                         /*
100                          * Allow only a single IBSS interface to be up at any
101                          * time. This is restricted because beacon distribution
102                          * cannot work properly if both are in the same IBSS.
103                          *
104                          * To remove this restriction we'd have to disallow them
105                          * from setting the same SSID on different IBSS interfaces
106                          * belonging to the same hardware. Then, however, we're
107                          * faced with having to adopt two different TSF timers...
108                          */
109                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
110                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
111                                 return -EBUSY;
112
113                         /*
114                          * The remaining checks are only performed for interfaces
115                          * with the same MAC address.
116                          */
117                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
118                                 continue;
119
120                         /*
121                          * check whether it may have the same address
122                          */
123                         if (!identical_mac_addr_allowed(sdata->vif.type,
124                                                         nsdata->vif.type))
125                                 return -ENOTUNIQ;
126
127                         /*
128                          * can only add VLANs to enabled APs
129                          */
130                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
131                             nsdata->vif.type == NL80211_IFTYPE_AP)
132                                 sdata->bss = &nsdata->u.ap;
133                 }
134         }
135
136         switch (sdata->vif.type) {
137         case NL80211_IFTYPE_WDS:
138                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
139                         return -ENOLINK;
140                 break;
141         case NL80211_IFTYPE_AP_VLAN:
142                 if (!sdata->bss)
143                         return -ENOLINK;
144                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
145                 break;
146         case NL80211_IFTYPE_AP:
147                 sdata->bss = &sdata->u.ap;
148                 break;
149         case NL80211_IFTYPE_MESH_POINT:
150                 if (!ieee80211_vif_is_mesh(&sdata->vif))
151                         break;
152                 /* mesh ifaces must set allmulti to forward mcast traffic */
153                 atomic_inc(&local->iff_allmultis);
154                 break;
155         case NL80211_IFTYPE_STATION:
156         case NL80211_IFTYPE_MONITOR:
157         case NL80211_IFTYPE_ADHOC:
158                 /* no special treatment */
159                 break;
160         case NL80211_IFTYPE_UNSPECIFIED:
161         case __NL80211_IFTYPE_AFTER_LAST:
162                 /* cannot happen */
163                 WARN_ON(1);
164                 break;
165         }
166
167         if (local->open_count == 0) {
168                 res = drv_start(local);
169                 if (res)
170                         goto err_del_bss;
171                 /* we're brought up, everything changes */
172                 hw_reconf_flags = ~0;
173                 ieee80211_led_radio(local, true);
174         }
175
176         /*
177          * Check all interfaces and copy the hopefully now-present
178          * MAC address to those that have the special null one.
179          */
180         list_for_each_entry(nsdata, &local->interfaces, list) {
181                 struct net_device *ndev = nsdata->dev;
182
183                 /*
184                  * No need to check netif_running since we do not allow
185                  * it to start up with this invalid address.
186                  */
187                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
188                         memcpy(ndev->dev_addr,
189                                local->hw.wiphy->perm_addr,
190                                ETH_ALEN);
191         }
192
193         /*
194          * Validate the MAC address for this device.
195          */
196         if (!is_valid_ether_addr(dev->dev_addr)) {
197                 if (!local->open_count)
198                         drv_stop(local);
199                 return -EADDRNOTAVAIL;
200         }
201
202         switch (sdata->vif.type) {
203         case NL80211_IFTYPE_AP_VLAN:
204                 /* no need to tell driver */
205                 break;
206         case NL80211_IFTYPE_MONITOR:
207                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
208                         local->cooked_mntrs++;
209                         break;
210                 }
211
212                 /* must be before the call to ieee80211_configure_filter */
213                 local->monitors++;
214                 if (local->monitors == 1) {
215                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
216                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
217                 }
218
219                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
220                         local->fif_fcsfail++;
221                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
222                         local->fif_plcpfail++;
223                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
224                         local->fif_control++;
225                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
226                         local->fif_other_bss++;
227
228                 spin_lock_bh(&local->filter_lock);
229                 ieee80211_configure_filter(local);
230                 spin_unlock_bh(&local->filter_lock);
231                 break;
232         default:
233                 conf.vif = &sdata->vif;
234                 conf.type = sdata->vif.type;
235                 conf.mac_addr = dev->dev_addr;
236                 res = drv_add_interface(local, &conf);
237                 if (res)
238                         goto err_stop;
239
240                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
241                         local->fif_other_bss++;
242                         spin_lock_bh(&local->filter_lock);
243                         ieee80211_configure_filter(local);
244                         spin_unlock_bh(&local->filter_lock);
245
246                         ieee80211_start_mesh(sdata);
247                 }
248                 changed |= ieee80211_reset_erp_info(sdata);
249                 ieee80211_bss_info_change_notify(sdata, changed);
250                 ieee80211_enable_keys(sdata);
251
252                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
253                         netif_carrier_off(dev);
254                 else
255                         netif_carrier_on(dev);
256         }
257
258         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
259                 /* Create STA entry for the WDS peer */
260                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
261                                      GFP_KERNEL);
262                 if (!sta) {
263                         res = -ENOMEM;
264                         goto err_del_interface;
265                 }
266
267                 /* no locking required since STA is not live yet */
268                 sta->flags |= WLAN_STA_AUTHORIZED;
269
270                 res = sta_info_insert(sta);
271                 if (res) {
272                         /* STA has been freed */
273                         goto err_del_interface;
274                 }
275         }
276
277         if (local->open_count == 0) {
278                 tasklet_enable(&local->tx_pending_tasklet);
279                 tasklet_enable(&local->tasklet);
280         }
281
282         /*
283          * set_multicast_list will be invoked by the networking core
284          * which will check whether any increments here were done in
285          * error and sync them down to the hardware as filter flags.
286          */
287         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
288                 atomic_inc(&local->iff_allmultis);
289
290         if (sdata->flags & IEEE80211_SDATA_PROMISC)
291                 atomic_inc(&local->iff_promiscs);
292
293         hw_reconf_flags |= __ieee80211_recalc_idle(local);
294
295         local->open_count++;
296         if (hw_reconf_flags) {
297                 ieee80211_hw_config(local, hw_reconf_flags);
298                 /*
299                  * set default queue parameters so drivers don't
300                  * need to initialise the hardware if the hardware
301                  * doesn't start up with sane defaults
302                  */
303                 ieee80211_set_wmm_default(sdata);
304         }
305
306         ieee80211_recalc_ps(local, -1);
307
308         /*
309          * ieee80211_sta_work is disabled while network interface
310          * is down. Therefore, some configuration changes may not
311          * yet be effective. Trigger execution of ieee80211_sta_work
312          * to fix this.
313          */
314         if (sdata->vif.type == NL80211_IFTYPE_STATION)
315                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
316
317         netif_tx_start_all_queues(dev);
318
319         return 0;
320  err_del_interface:
321         drv_remove_interface(local, &conf);
322  err_stop:
323         if (!local->open_count)
324                 drv_stop(local);
325  err_del_bss:
326         sdata->bss = NULL;
327         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
328                 list_del(&sdata->u.vlan.list);
329         return res;
330 }
331
332 static int ieee80211_stop(struct net_device *dev)
333 {
334         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
335         struct ieee80211_local *local = sdata->local;
336         struct ieee80211_if_init_conf conf;
337         struct sta_info *sta;
338         unsigned long flags;
339         struct sk_buff *skb, *tmp;
340         u32 hw_reconf_flags = 0;
341         int i;
342
343         /*
344          * Stop TX on this interface first.
345          */
346         netif_tx_stop_all_queues(dev);
347
348         /*
349          * Now delete all active aggregation sessions.
350          */
351         rcu_read_lock();
352
353         list_for_each_entry_rcu(sta, &local->sta_list, list) {
354                 if (sta->sdata == sdata)
355                         ieee80211_sta_tear_down_BA_sessions(sta);
356         }
357
358         rcu_read_unlock();
359
360         /*
361          * Remove all stations associated with this interface.
362          *
363          * This must be done before calling ops->remove_interface()
364          * because otherwise we can later invoke ops->sta_notify()
365          * whenever the STAs are removed, and that invalidates driver
366          * assumptions about always getting a vif pointer that is valid
367          * (because if we remove a STA after ops->remove_interface()
368          * the driver will have removed the vif info already!)
369          *
370          * We could relax this and only unlink the stations from the
371          * hash table and list but keep them on a per-sdata list that
372          * will be inserted back again when the interface is brought
373          * up again, but I don't currently see a use case for that,
374          * except with WDS which gets a STA entry created when it is
375          * brought up.
376          */
377         sta_info_flush(local, sdata);
378
379         /*
380          * Don't count this interface for promisc/allmulti while it
381          * is down. dev_mc_unsync() will invoke set_multicast_list
382          * on the master interface which will sync these down to the
383          * hardware as filter flags.
384          */
385         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
386                 atomic_dec(&local->iff_allmultis);
387
388         if (sdata->flags & IEEE80211_SDATA_PROMISC)
389                 atomic_dec(&local->iff_promiscs);
390
391         netif_addr_lock_bh(dev);
392         spin_lock_bh(&local->filter_lock);
393         __dev_addr_unsync(&local->mc_list, &local->mc_count,
394                           &dev->mc_list, &dev->mc_count);
395         ieee80211_configure_filter(local);
396         spin_unlock_bh(&local->filter_lock);
397         netif_addr_unlock_bh(dev);
398
399         del_timer_sync(&local->dynamic_ps_timer);
400         cancel_work_sync(&local->dynamic_ps_enable_work);
401
402         /* APs need special treatment */
403         if (sdata->vif.type == NL80211_IFTYPE_AP) {
404                 struct ieee80211_sub_if_data *vlan, *tmp;
405                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
406
407                 /* remove beacon */
408                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
409                 synchronize_rcu();
410                 kfree(old_beacon);
411
412                 /* down all dependent devices, that is VLANs */
413                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
414                                          u.vlan.list)
415                         dev_close(vlan->dev);
416                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
417         }
418
419         local->open_count--;
420
421         switch (sdata->vif.type) {
422         case NL80211_IFTYPE_AP_VLAN:
423                 list_del(&sdata->u.vlan.list);
424                 /* no need to tell driver */
425                 break;
426         case NL80211_IFTYPE_MONITOR:
427                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
428                         local->cooked_mntrs--;
429                         break;
430                 }
431
432                 local->monitors--;
433                 if (local->monitors == 0) {
434                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
435                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
436                 }
437
438                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
439                         local->fif_fcsfail--;
440                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
441                         local->fif_plcpfail--;
442                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
443                         local->fif_control--;
444                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
445                         local->fif_other_bss--;
446
447                 spin_lock_bh(&local->filter_lock);
448                 ieee80211_configure_filter(local);
449                 spin_unlock_bh(&local->filter_lock);
450                 break;
451         case NL80211_IFTYPE_STATION:
452                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
453                 del_timer_sync(&sdata->u.mgd.timer);
454                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
455                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
456                 /*
457                  * If any of the timers fired while we waited for it, it will
458                  * have queued its work. Now the work will be running again
459                  * but will not rearm the timer again because it checks
460                  * whether the interface is running, which, at this point,
461                  * it no longer is.
462                  */
463                 cancel_work_sync(&sdata->u.mgd.work);
464                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
465                 cancel_work_sync(&sdata->u.mgd.monitor_work);
466                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
467
468                 /*
469                  * When we get here, the interface is marked down.
470                  * Call synchronize_rcu() to wait for the RX path
471                  * should it be using the interface and enqueuing
472                  * frames at this very time on another CPU.
473                  */
474                 synchronize_rcu();
475                 skb_queue_purge(&sdata->u.mgd.skb_queue);
476                 /* fall through */
477         case NL80211_IFTYPE_ADHOC:
478                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
479                         del_timer_sync(&sdata->u.ibss.timer);
480                         cancel_work_sync(&sdata->u.ibss.work);
481                         synchronize_rcu();
482                         skb_queue_purge(&sdata->u.ibss.skb_queue);
483                 }
484                 /* fall through */
485         case NL80211_IFTYPE_MESH_POINT:
486                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
487                         /* other_bss and allmulti are always set on mesh
488                          * ifaces */
489                         local->fif_other_bss--;
490                         atomic_dec(&local->iff_allmultis);
491
492                         spin_lock_bh(&local->filter_lock);
493                         ieee80211_configure_filter(local);
494                         spin_unlock_bh(&local->filter_lock);
495
496                         ieee80211_stop_mesh(sdata);
497                 }
498                 /* fall through */
499         default:
500                 if (local->scan_sdata == sdata) {
501                         if (!local->ops->hw_scan)
502                                 cancel_delayed_work_sync(&local->scan_work);
503                         /*
504                          * The software scan can no longer run now, so we can
505                          * clear out the scan_sdata reference. However, the
506                          * hardware scan may still be running. The complete
507                          * function must be prepared to handle a NULL value.
508                          */
509                         local->scan_sdata = NULL;
510                         /*
511                          * The memory barrier guarantees that another CPU
512                          * that is hardware-scanning will now see the fact
513                          * that this interface is gone.
514                          */
515                         smp_mb();
516                         /*
517                          * If software scanning, complete the scan but since
518                          * the scan_sdata is NULL already don't send out a
519                          * scan event to userspace -- the scan is incomplete.
520                          */
521                         if (local->sw_scanning)
522                                 ieee80211_scan_completed(&local->hw, true);
523                 }
524
525                 conf.vif = &sdata->vif;
526                 conf.type = sdata->vif.type;
527                 conf.mac_addr = dev->dev_addr;
528                 /* disable all keys for as long as this netdev is down */
529                 ieee80211_disable_keys(sdata);
530                 drv_remove_interface(local, &conf);
531         }
532
533         sdata->bss = NULL;
534
535         hw_reconf_flags |= __ieee80211_recalc_idle(local);
536
537         ieee80211_recalc_ps(local, -1);
538
539         if (local->open_count == 0) {
540                 drv_stop(local);
541
542                 ieee80211_led_radio(local, false);
543
544                 flush_workqueue(local->hw.workqueue);
545
546                 tasklet_disable(&local->tx_pending_tasklet);
547                 tasklet_disable(&local->tasklet);
548
549                 /* no reconfiguring after stop! */
550                 hw_reconf_flags = 0;
551         }
552
553         /* do after stop to avoid reconfiguring when we stop anyway */
554         if (hw_reconf_flags)
555                 ieee80211_hw_config(local, hw_reconf_flags);
556
557         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
558         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
559                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
560                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
561                         if (info->control.vif == &sdata->vif) {
562                                 __skb_unlink(skb, &local->pending[i]);
563                                 dev_kfree_skb_irq(skb);
564                         }
565                 }
566         }
567         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
568
569         return 0;
570 }
571
572 static void ieee80211_set_multicast_list(struct net_device *dev)
573 {
574         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
575         struct ieee80211_local *local = sdata->local;
576         int allmulti, promisc, sdata_allmulti, sdata_promisc;
577
578         allmulti = !!(dev->flags & IFF_ALLMULTI);
579         promisc = !!(dev->flags & IFF_PROMISC);
580         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
581         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
582
583         if (allmulti != sdata_allmulti) {
584                 if (dev->flags & IFF_ALLMULTI)
585                         atomic_inc(&local->iff_allmultis);
586                 else
587                         atomic_dec(&local->iff_allmultis);
588                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
589         }
590
591         if (promisc != sdata_promisc) {
592                 if (dev->flags & IFF_PROMISC)
593                         atomic_inc(&local->iff_promiscs);
594                 else
595                         atomic_dec(&local->iff_promiscs);
596                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
597         }
598         spin_lock_bh(&local->filter_lock);
599         __dev_addr_sync(&local->mc_list, &local->mc_count,
600                         &dev->mc_list, &dev->mc_count);
601         ieee80211_configure_filter(local);
602         spin_unlock_bh(&local->filter_lock);
603 }
604
605 /*
606  * Called when the netdev is removed or, by the code below, before
607  * the interface type changes.
608  */
609 static void ieee80211_teardown_sdata(struct net_device *dev)
610 {
611         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
612         struct ieee80211_local *local = sdata->local;
613         struct beacon_data *beacon;
614         struct sk_buff *skb;
615         int flushed;
616         int i;
617
618         /* free extra data */
619         ieee80211_free_keys(sdata);
620
621         ieee80211_debugfs_remove_netdev(sdata);
622
623         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
624                 __skb_queue_purge(&sdata->fragments[i].skb_list);
625         sdata->fragment_next = 0;
626
627         switch (sdata->vif.type) {
628         case NL80211_IFTYPE_AP:
629                 beacon = sdata->u.ap.beacon;
630                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
631                 synchronize_rcu();
632                 kfree(beacon);
633
634                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
635                         local->total_ps_buffered--;
636                         dev_kfree_skb(skb);
637                 }
638
639                 break;
640         case NL80211_IFTYPE_MESH_POINT:
641                 if (ieee80211_vif_is_mesh(&sdata->vif))
642                         mesh_rmc_free(sdata);
643                 break;
644         case NL80211_IFTYPE_ADHOC:
645                 if (WARN_ON(sdata->u.ibss.presp))
646                         kfree_skb(sdata->u.ibss.presp);
647                 break;
648         case NL80211_IFTYPE_STATION:
649         case NL80211_IFTYPE_WDS:
650         case NL80211_IFTYPE_AP_VLAN:
651         case NL80211_IFTYPE_MONITOR:
652                 break;
653         case NL80211_IFTYPE_UNSPECIFIED:
654         case __NL80211_IFTYPE_AFTER_LAST:
655                 BUG();
656                 break;
657         }
658
659         flushed = sta_info_flush(local, sdata);
660         WARN_ON(flushed);
661 }
662
663 static const struct net_device_ops ieee80211_dataif_ops = {
664         .ndo_open               = ieee80211_open,
665         .ndo_stop               = ieee80211_stop,
666         .ndo_uninit             = ieee80211_teardown_sdata,
667         .ndo_start_xmit         = ieee80211_subif_start_xmit,
668         .ndo_set_multicast_list = ieee80211_set_multicast_list,
669         .ndo_change_mtu         = ieee80211_change_mtu,
670         .ndo_set_mac_address    = eth_mac_addr,
671 };
672
673 static const struct net_device_ops ieee80211_monitorif_ops = {
674         .ndo_open               = ieee80211_open,
675         .ndo_stop               = ieee80211_stop,
676         .ndo_uninit             = ieee80211_teardown_sdata,
677         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
678         .ndo_set_multicast_list = ieee80211_set_multicast_list,
679         .ndo_change_mtu         = ieee80211_change_mtu,
680         .ndo_set_mac_address    = eth_mac_addr,
681 };
682
683 static void ieee80211_if_setup(struct net_device *dev)
684 {
685         ether_setup(dev);
686         dev->netdev_ops = &ieee80211_dataif_ops;
687         dev->wireless_handlers = &ieee80211_iw_handler_def;
688         dev->destructor = free_netdev;
689 }
690
691 /*
692  * Helper function to initialise an interface to a specific type.
693  */
694 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
695                                   enum nl80211_iftype type)
696 {
697         /* clear type-dependent union */
698         memset(&sdata->u, 0, sizeof(sdata->u));
699
700         /* and set some type-dependent values */
701         sdata->vif.type = type;
702         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
703         sdata->wdev.iftype = type;
704
705         /* only monitor differs */
706         sdata->dev->type = ARPHRD_ETHER;
707
708         switch (type) {
709         case NL80211_IFTYPE_AP:
710                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
711                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
712                 break;
713         case NL80211_IFTYPE_STATION:
714                 ieee80211_sta_setup_sdata(sdata);
715                 break;
716         case NL80211_IFTYPE_ADHOC:
717                 ieee80211_ibss_setup_sdata(sdata);
718                 break;
719         case NL80211_IFTYPE_MESH_POINT:
720                 if (ieee80211_vif_is_mesh(&sdata->vif))
721                         ieee80211_mesh_init_sdata(sdata);
722                 break;
723         case NL80211_IFTYPE_MONITOR:
724                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
725                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
726                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
727                                       MONITOR_FLAG_OTHER_BSS;
728                 break;
729         case NL80211_IFTYPE_WDS:
730         case NL80211_IFTYPE_AP_VLAN:
731                 break;
732         case NL80211_IFTYPE_UNSPECIFIED:
733         case __NL80211_IFTYPE_AFTER_LAST:
734                 BUG();
735                 break;
736         }
737
738         ieee80211_debugfs_add_netdev(sdata);
739 }
740
741 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
742                              enum nl80211_iftype type)
743 {
744         ASSERT_RTNL();
745
746         if (type == sdata->vif.type)
747                 return 0;
748
749         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
750         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
751             type == NL80211_IFTYPE_ADHOC)
752                 return -EOPNOTSUPP;
753
754         /*
755          * We could, here, on changes between IBSS/STA/MESH modes,
756          * invoke an MLME function instead that disassociates etc.
757          * and goes into the requested mode.
758          */
759
760         if (netif_running(sdata->dev))
761                 return -EBUSY;
762
763         /* Purge and reset type-dependent state. */
764         ieee80211_teardown_sdata(sdata->dev);
765         ieee80211_setup_sdata(sdata, type);
766
767         /* reset some values that shouldn't be kept across type changes */
768         sdata->vif.bss_conf.basic_rates =
769                 ieee80211_mandatory_rates(sdata->local,
770                         sdata->local->hw.conf.channel->band);
771         sdata->drop_unencrypted = 0;
772
773         return 0;
774 }
775
776 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
777                      struct net_device **new_dev, enum nl80211_iftype type,
778                      struct vif_params *params)
779 {
780         struct net_device *ndev;
781         struct ieee80211_sub_if_data *sdata = NULL;
782         int ret, i;
783
784         ASSERT_RTNL();
785
786         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
787                             name, ieee80211_if_setup);
788         if (!ndev)
789                 return -ENOMEM;
790         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
791
792         ndev->needed_headroom = local->tx_headroom +
793                                 4*6 /* four MAC addresses */
794                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
795                                 + 6 /* mesh */
796                                 + 8 /* rfc1042/bridge tunnel */
797                                 - ETH_HLEN /* ethernet hard_header_len */
798                                 + IEEE80211_ENCRYPT_HEADROOM;
799         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
800
801         ret = dev_alloc_name(ndev, ndev->name);
802         if (ret < 0)
803                 goto fail;
804
805         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
806         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
807
808         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
809         sdata = netdev_priv(ndev);
810         ndev->ieee80211_ptr = &sdata->wdev;
811
812         /* initialise type-independent data */
813         sdata->wdev.wiphy = local->hw.wiphy;
814         sdata->local = local;
815         sdata->dev = ndev;
816
817         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
818                 skb_queue_head_init(&sdata->fragments[i].skb_list);
819
820         INIT_LIST_HEAD(&sdata->key_list);
821
822         sdata->force_unicast_rateidx = -1;
823         sdata->max_ratectrl_rateidx = -1;
824
825         /* setup type-dependent data */
826         ieee80211_setup_sdata(sdata, type);
827
828         ret = register_netdevice(ndev);
829         if (ret)
830                 goto fail;
831
832         if (ieee80211_vif_is_mesh(&sdata->vif) &&
833             params && params->mesh_id_len)
834                 ieee80211_sdata_set_mesh_id(sdata,
835                                             params->mesh_id_len,
836                                             params->mesh_id);
837
838         mutex_lock(&local->iflist_mtx);
839         list_add_tail_rcu(&sdata->list, &local->interfaces);
840         mutex_unlock(&local->iflist_mtx);
841
842         if (new_dev)
843                 *new_dev = ndev;
844
845         return 0;
846
847  fail:
848         free_netdev(ndev);
849         return ret;
850 }
851
852 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
853 {
854         ASSERT_RTNL();
855
856         mutex_lock(&sdata->local->iflist_mtx);
857         list_del_rcu(&sdata->list);
858         mutex_unlock(&sdata->local->iflist_mtx);
859
860         synchronize_rcu();
861         unregister_netdevice(sdata->dev);
862 }
863
864 /*
865  * Remove all interfaces, may only be called at hardware unregistration
866  * time because it doesn't do RCU-safe list removals.
867  */
868 void ieee80211_remove_interfaces(struct ieee80211_local *local)
869 {
870         struct ieee80211_sub_if_data *sdata, *tmp;
871
872         ASSERT_RTNL();
873
874         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
875                 /*
876                  * we cannot hold the iflist_mtx across unregister_netdevice,
877                  * but we only need to hold it for list modifications to lock
878                  * out readers since we're under the RTNL here as all other
879                  * writers.
880                  */
881                 mutex_lock(&local->iflist_mtx);
882                 list_del(&sdata->list);
883                 mutex_unlock(&local->iflist_mtx);
884
885                 unregister_netdevice(sdata->dev);
886         }
887 }
888
889 static u32 ieee80211_idle_off(struct ieee80211_local *local,
890                               const char *reason)
891 {
892         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
893                 return 0;
894
895 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
896         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
897                wiphy_name(local->hw.wiphy), reason);
898 #endif
899
900         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
901         return IEEE80211_CONF_CHANGE_IDLE;
902 }
903
904 static u32 ieee80211_idle_on(struct ieee80211_local *local)
905 {
906         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
907                 return 0;
908
909 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
910         printk(KERN_DEBUG "%s: device now idle\n",
911                wiphy_name(local->hw.wiphy));
912 #endif
913
914         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
915         return IEEE80211_CONF_CHANGE_IDLE;
916 }
917
918 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
919 {
920         struct ieee80211_sub_if_data *sdata;
921         int count = 0;
922
923         if (local->hw_scanning || local->sw_scanning)
924                 return ieee80211_idle_off(local, "scanning");
925
926         list_for_each_entry(sdata, &local->interfaces, list) {
927                 if (!netif_running(sdata->dev))
928                         continue;
929                 /* do not count disabled managed interfaces */
930                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
931                     !sdata->u.mgd.associated &&
932                     list_empty(&sdata->u.mgd.work_list))
933                         continue;
934                 /* do not count unused IBSS interfaces */
935                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
936                     !sdata->u.ibss.ssid_len)
937                         continue;
938                 /* count everything else */
939                 count++;
940         }
941
942         if (!count)
943                 return ieee80211_idle_on(local);
944         else
945                 return ieee80211_idle_off(local, "in use");
946
947         return 0;
948 }
949
950 void ieee80211_recalc_idle(struct ieee80211_local *local)
951 {
952         u32 chg;
953
954         mutex_lock(&local->iflist_mtx);
955         chg = __ieee80211_recalc_idle(local);
956         mutex_unlock(&local->iflist_mtx);
957         if (chg)
958                 ieee80211_hw_config(local, chg);
959 }