mac80211: disable beacons before removing the associated interface
[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 (test_bit(SCAN_SW_SCANNING, &local->scanning))
522                                 ieee80211_scan_completed(&local->hw, true);
523                 }
524
525                 /*
526                  * Disable beaconing for AP and mesh, IBSS can't
527                  * still be joined to a network at this point.
528                  */
529                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
530                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
531                         ieee80211_bss_info_change_notify(sdata,
532                                 BSS_CHANGED_BEACON_ENABLED);
533                 }
534
535                 conf.vif = &sdata->vif;
536                 conf.type = sdata->vif.type;
537                 conf.mac_addr = dev->dev_addr;
538                 /* disable all keys for as long as this netdev is down */
539                 ieee80211_disable_keys(sdata);
540                 drv_remove_interface(local, &conf);
541         }
542
543         sdata->bss = NULL;
544
545         hw_reconf_flags |= __ieee80211_recalc_idle(local);
546
547         ieee80211_recalc_ps(local, -1);
548
549         if (local->open_count == 0) {
550                 drv_stop(local);
551
552                 ieee80211_led_radio(local, false);
553
554                 flush_workqueue(local->hw.workqueue);
555
556                 tasklet_disable(&local->tx_pending_tasklet);
557                 tasklet_disable(&local->tasklet);
558
559                 /* no reconfiguring after stop! */
560                 hw_reconf_flags = 0;
561         }
562
563         /* do after stop to avoid reconfiguring when we stop anyway */
564         if (hw_reconf_flags)
565                 ieee80211_hw_config(local, hw_reconf_flags);
566
567         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
568         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
569                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
570                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
571                         if (info->control.vif == &sdata->vif) {
572                                 __skb_unlink(skb, &local->pending[i]);
573                                 dev_kfree_skb_irq(skb);
574                         }
575                 }
576         }
577         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
578
579         return 0;
580 }
581
582 static void ieee80211_set_multicast_list(struct net_device *dev)
583 {
584         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
585         struct ieee80211_local *local = sdata->local;
586         int allmulti, promisc, sdata_allmulti, sdata_promisc;
587
588         allmulti = !!(dev->flags & IFF_ALLMULTI);
589         promisc = !!(dev->flags & IFF_PROMISC);
590         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
591         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
592
593         if (allmulti != sdata_allmulti) {
594                 if (dev->flags & IFF_ALLMULTI)
595                         atomic_inc(&local->iff_allmultis);
596                 else
597                         atomic_dec(&local->iff_allmultis);
598                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
599         }
600
601         if (promisc != sdata_promisc) {
602                 if (dev->flags & IFF_PROMISC)
603                         atomic_inc(&local->iff_promiscs);
604                 else
605                         atomic_dec(&local->iff_promiscs);
606                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
607         }
608         spin_lock_bh(&local->filter_lock);
609         __dev_addr_sync(&local->mc_list, &local->mc_count,
610                         &dev->mc_list, &dev->mc_count);
611         ieee80211_configure_filter(local);
612         spin_unlock_bh(&local->filter_lock);
613 }
614
615 /*
616  * Called when the netdev is removed or, by the code below, before
617  * the interface type changes.
618  */
619 static void ieee80211_teardown_sdata(struct net_device *dev)
620 {
621         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
622         struct ieee80211_local *local = sdata->local;
623         struct beacon_data *beacon;
624         struct sk_buff *skb;
625         int flushed;
626         int i;
627
628         /* free extra data */
629         ieee80211_free_keys(sdata);
630
631         ieee80211_debugfs_remove_netdev(sdata);
632
633         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
634                 __skb_queue_purge(&sdata->fragments[i].skb_list);
635         sdata->fragment_next = 0;
636
637         switch (sdata->vif.type) {
638         case NL80211_IFTYPE_AP:
639                 beacon = sdata->u.ap.beacon;
640                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
641                 synchronize_rcu();
642                 kfree(beacon);
643
644                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
645                         local->total_ps_buffered--;
646                         dev_kfree_skb(skb);
647                 }
648
649                 break;
650         case NL80211_IFTYPE_MESH_POINT:
651                 if (ieee80211_vif_is_mesh(&sdata->vif))
652                         mesh_rmc_free(sdata);
653                 break;
654         case NL80211_IFTYPE_ADHOC:
655                 if (WARN_ON(sdata->u.ibss.presp))
656                         kfree_skb(sdata->u.ibss.presp);
657                 break;
658         case NL80211_IFTYPE_STATION:
659         case NL80211_IFTYPE_WDS:
660         case NL80211_IFTYPE_AP_VLAN:
661         case NL80211_IFTYPE_MONITOR:
662                 break;
663         case NL80211_IFTYPE_UNSPECIFIED:
664         case __NL80211_IFTYPE_AFTER_LAST:
665                 BUG();
666                 break;
667         }
668
669         flushed = sta_info_flush(local, sdata);
670         WARN_ON(flushed);
671 }
672
673 static const struct net_device_ops ieee80211_dataif_ops = {
674         .ndo_open               = ieee80211_open,
675         .ndo_stop               = ieee80211_stop,
676         .ndo_uninit             = ieee80211_teardown_sdata,
677         .ndo_start_xmit         = ieee80211_subif_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 const struct net_device_ops ieee80211_monitorif_ops = {
684         .ndo_open               = ieee80211_open,
685         .ndo_stop               = ieee80211_stop,
686         .ndo_uninit             = ieee80211_teardown_sdata,
687         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
688         .ndo_set_multicast_list = ieee80211_set_multicast_list,
689         .ndo_change_mtu         = ieee80211_change_mtu,
690         .ndo_set_mac_address    = eth_mac_addr,
691 };
692
693 static void ieee80211_if_setup(struct net_device *dev)
694 {
695         ether_setup(dev);
696         dev->netdev_ops = &ieee80211_dataif_ops;
697         dev->destructor = free_netdev;
698 }
699
700 /*
701  * Helper function to initialise an interface to a specific type.
702  */
703 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
704                                   enum nl80211_iftype type)
705 {
706         /* clear type-dependent union */
707         memset(&sdata->u, 0, sizeof(sdata->u));
708
709         /* and set some type-dependent values */
710         sdata->vif.type = type;
711         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
712         sdata->wdev.iftype = type;
713
714         /* only monitor differs */
715         sdata->dev->type = ARPHRD_ETHER;
716
717         switch (type) {
718         case NL80211_IFTYPE_AP:
719                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
720                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
721                 break;
722         case NL80211_IFTYPE_STATION:
723                 ieee80211_sta_setup_sdata(sdata);
724                 break;
725         case NL80211_IFTYPE_ADHOC:
726                 ieee80211_ibss_setup_sdata(sdata);
727                 break;
728         case NL80211_IFTYPE_MESH_POINT:
729                 if (ieee80211_vif_is_mesh(&sdata->vif))
730                         ieee80211_mesh_init_sdata(sdata);
731                 break;
732         case NL80211_IFTYPE_MONITOR:
733                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
734                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
735                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
736                                       MONITOR_FLAG_OTHER_BSS;
737                 break;
738         case NL80211_IFTYPE_WDS:
739         case NL80211_IFTYPE_AP_VLAN:
740                 break;
741         case NL80211_IFTYPE_UNSPECIFIED:
742         case __NL80211_IFTYPE_AFTER_LAST:
743                 BUG();
744                 break;
745         }
746
747         ieee80211_debugfs_add_netdev(sdata);
748 }
749
750 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
751                              enum nl80211_iftype type)
752 {
753         ASSERT_RTNL();
754
755         if (type == sdata->vif.type)
756                 return 0;
757
758         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
759         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
760             type == NL80211_IFTYPE_ADHOC)
761                 return -EOPNOTSUPP;
762
763         /*
764          * We could, here, on changes between IBSS/STA/MESH modes,
765          * invoke an MLME function instead that disassociates etc.
766          * and goes into the requested mode.
767          */
768
769         if (netif_running(sdata->dev))
770                 return -EBUSY;
771
772         /* Purge and reset type-dependent state. */
773         ieee80211_teardown_sdata(sdata->dev);
774         ieee80211_setup_sdata(sdata, type);
775
776         /* reset some values that shouldn't be kept across type changes */
777         sdata->vif.bss_conf.basic_rates =
778                 ieee80211_mandatory_rates(sdata->local,
779                         sdata->local->hw.conf.channel->band);
780         sdata->drop_unencrypted = 0;
781
782         return 0;
783 }
784
785 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
786                      struct net_device **new_dev, enum nl80211_iftype type,
787                      struct vif_params *params)
788 {
789         struct net_device *ndev;
790         struct ieee80211_sub_if_data *sdata = NULL;
791         int ret, i;
792
793         ASSERT_RTNL();
794
795         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
796                             name, ieee80211_if_setup);
797         if (!ndev)
798                 return -ENOMEM;
799         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
800
801         ndev->needed_headroom = local->tx_headroom +
802                                 4*6 /* four MAC addresses */
803                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
804                                 + 6 /* mesh */
805                                 + 8 /* rfc1042/bridge tunnel */
806                                 - ETH_HLEN /* ethernet hard_header_len */
807                                 + IEEE80211_ENCRYPT_HEADROOM;
808         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
809
810         ret = dev_alloc_name(ndev, ndev->name);
811         if (ret < 0)
812                 goto fail;
813
814         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
815         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
816
817         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
818         sdata = netdev_priv(ndev);
819         ndev->ieee80211_ptr = &sdata->wdev;
820
821         /* initialise type-independent data */
822         sdata->wdev.wiphy = local->hw.wiphy;
823         sdata->local = local;
824         sdata->dev = ndev;
825
826         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
827                 skb_queue_head_init(&sdata->fragments[i].skb_list);
828
829         INIT_LIST_HEAD(&sdata->key_list);
830
831         sdata->force_unicast_rateidx = -1;
832         sdata->max_ratectrl_rateidx = -1;
833
834         /* setup type-dependent data */
835         ieee80211_setup_sdata(sdata, type);
836
837         ret = register_netdevice(ndev);
838         if (ret)
839                 goto fail;
840
841         if (ieee80211_vif_is_mesh(&sdata->vif) &&
842             params && params->mesh_id_len)
843                 ieee80211_sdata_set_mesh_id(sdata,
844                                             params->mesh_id_len,
845                                             params->mesh_id);
846
847         mutex_lock(&local->iflist_mtx);
848         list_add_tail_rcu(&sdata->list, &local->interfaces);
849         mutex_unlock(&local->iflist_mtx);
850
851         if (new_dev)
852                 *new_dev = ndev;
853
854         return 0;
855
856  fail:
857         free_netdev(ndev);
858         return ret;
859 }
860
861 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
862 {
863         ASSERT_RTNL();
864
865         mutex_lock(&sdata->local->iflist_mtx);
866         list_del_rcu(&sdata->list);
867         mutex_unlock(&sdata->local->iflist_mtx);
868
869         synchronize_rcu();
870         unregister_netdevice(sdata->dev);
871 }
872
873 /*
874  * Remove all interfaces, may only be called at hardware unregistration
875  * time because it doesn't do RCU-safe list removals.
876  */
877 void ieee80211_remove_interfaces(struct ieee80211_local *local)
878 {
879         struct ieee80211_sub_if_data *sdata, *tmp;
880
881         ASSERT_RTNL();
882
883         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
884                 /*
885                  * we cannot hold the iflist_mtx across unregister_netdevice,
886                  * but we only need to hold it for list modifications to lock
887                  * out readers since we're under the RTNL here as all other
888                  * writers.
889                  */
890                 mutex_lock(&local->iflist_mtx);
891                 list_del(&sdata->list);
892                 mutex_unlock(&local->iflist_mtx);
893
894                 unregister_netdevice(sdata->dev);
895         }
896 }
897
898 static u32 ieee80211_idle_off(struct ieee80211_local *local,
899                               const char *reason)
900 {
901         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
902                 return 0;
903
904 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
905         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
906                wiphy_name(local->hw.wiphy), reason);
907 #endif
908
909         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
910         return IEEE80211_CONF_CHANGE_IDLE;
911 }
912
913 static u32 ieee80211_idle_on(struct ieee80211_local *local)
914 {
915         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
916                 return 0;
917
918 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
919         printk(KERN_DEBUG "%s: device now idle\n",
920                wiphy_name(local->hw.wiphy));
921 #endif
922
923         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
924         return IEEE80211_CONF_CHANGE_IDLE;
925 }
926
927 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
928 {
929         struct ieee80211_sub_if_data *sdata;
930         int count = 0;
931
932         if (local->scanning)
933                 return ieee80211_idle_off(local, "scanning");
934
935         list_for_each_entry(sdata, &local->interfaces, list) {
936                 if (!netif_running(sdata->dev))
937                         continue;
938                 /* do not count disabled managed interfaces */
939                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
940                     !sdata->u.mgd.associated &&
941                     list_empty(&sdata->u.mgd.work_list))
942                         continue;
943                 /* do not count unused IBSS interfaces */
944                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
945                     !sdata->u.ibss.ssid_len)
946                         continue;
947                 /* count everything else */
948                 count++;
949         }
950
951         if (!count)
952                 return ieee80211_idle_on(local);
953         else
954                 return ieee80211_idle_off(local, "in use");
955
956         return 0;
957 }
958
959 void ieee80211_recalc_idle(struct ieee80211_local *local)
960 {
961         u32 chg;
962
963         mutex_lock(&local->iflist_mtx);
964         chg = __ieee80211_recalc_idle(local);
965         mutex_unlock(&local->iflist_mtx);
966         if (chg)
967                 ieee80211_hw_config(local, chg);
968 }