mac80211: allow configure_filter callback to sleep
[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                         local->fif_pspoll++;
226                 }
227                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
228                         local->fif_other_bss++;
229
230                 ieee80211_configure_filter(local);
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                         ieee80211_configure_filter(local);
243
244                         ieee80211_start_mesh(sdata);
245                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
246                         local->fif_pspoll++;
247
248                         ieee80211_configure_filter(local);
249                 }
250
251                 changed |= ieee80211_reset_erp_info(sdata);
252                 ieee80211_bss_info_change_notify(sdata, changed);
253                 ieee80211_enable_keys(sdata);
254
255                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
256                         netif_carrier_off(dev);
257                 else
258                         netif_carrier_on(dev);
259         }
260
261         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
262                 /* Create STA entry for the WDS peer */
263                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
264                                      GFP_KERNEL);
265                 if (!sta) {
266                         res = -ENOMEM;
267                         goto err_del_interface;
268                 }
269
270                 /* no locking required since STA is not live yet */
271                 sta->flags |= WLAN_STA_AUTHORIZED;
272
273                 res = sta_info_insert(sta);
274                 if (res) {
275                         /* STA has been freed */
276                         goto err_del_interface;
277                 }
278         }
279
280         if (local->open_count == 0) {
281                 tasklet_enable(&local->tx_pending_tasklet);
282                 tasklet_enable(&local->tasklet);
283         }
284
285         /*
286          * set_multicast_list will be invoked by the networking core
287          * which will check whether any increments here were done in
288          * error and sync them down to the hardware as filter flags.
289          */
290         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
291                 atomic_inc(&local->iff_allmultis);
292
293         if (sdata->flags & IEEE80211_SDATA_PROMISC)
294                 atomic_inc(&local->iff_promiscs);
295
296         hw_reconf_flags |= __ieee80211_recalc_idle(local);
297
298         local->open_count++;
299         if (hw_reconf_flags) {
300                 ieee80211_hw_config(local, hw_reconf_flags);
301                 /*
302                  * set default queue parameters so drivers don't
303                  * need to initialise the hardware if the hardware
304                  * doesn't start up with sane defaults
305                  */
306                 ieee80211_set_wmm_default(sdata);
307         }
308
309         ieee80211_recalc_ps(local, -1);
310
311         /*
312          * ieee80211_sta_work is disabled while network interface
313          * is down. Therefore, some configuration changes may not
314          * yet be effective. Trigger execution of ieee80211_sta_work
315          * to fix this.
316          */
317         if (sdata->vif.type == NL80211_IFTYPE_STATION)
318                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
319
320         netif_tx_start_all_queues(dev);
321
322         return 0;
323  err_del_interface:
324         drv_remove_interface(local, &conf);
325  err_stop:
326         if (!local->open_count)
327                 drv_stop(local);
328  err_del_bss:
329         sdata->bss = NULL;
330         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
331                 list_del(&sdata->u.vlan.list);
332         return res;
333 }
334
335 static int ieee80211_stop(struct net_device *dev)
336 {
337         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
338         struct ieee80211_local *local = sdata->local;
339         struct ieee80211_if_init_conf conf;
340         struct sta_info *sta;
341         unsigned long flags;
342         struct sk_buff *skb, *tmp;
343         u32 hw_reconf_flags = 0;
344         int i;
345
346         /*
347          * Stop TX on this interface first.
348          */
349         netif_tx_stop_all_queues(dev);
350
351         /*
352          * Now delete all active aggregation sessions.
353          */
354         rcu_read_lock();
355
356         list_for_each_entry_rcu(sta, &local->sta_list, list) {
357                 if (sta->sdata == sdata)
358                         ieee80211_sta_tear_down_BA_sessions(sta);
359         }
360
361         rcu_read_unlock();
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         __dev_addr_unsync(&local->mc_list, &local->mc_count,
400                           &dev->mc_list, &dev->mc_count);
401         spin_unlock_bh(&local->filter_lock);
402         netif_addr_unlock_bh(dev);
403
404         ieee80211_configure_filter(local);
405
406         del_timer_sync(&local->dynamic_ps_timer);
407         cancel_work_sync(&local->dynamic_ps_enable_work);
408
409         /* APs need special treatment */
410         if (sdata->vif.type == NL80211_IFTYPE_AP) {
411                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
412                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
413
414                 /* remove beacon */
415                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
416                 synchronize_rcu();
417                 kfree(old_beacon);
418
419                 /* down all dependent devices, that is VLANs */
420                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
421                                          u.vlan.list)
422                         dev_close(vlan->dev);
423                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
424         }
425
426         local->open_count--;
427
428         switch (sdata->vif.type) {
429         case NL80211_IFTYPE_AP_VLAN:
430                 list_del(&sdata->u.vlan.list);
431                 /* no need to tell driver */
432                 break;
433         case NL80211_IFTYPE_MONITOR:
434                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
435                         local->cooked_mntrs--;
436                         break;
437                 }
438
439                 local->monitors--;
440                 if (local->monitors == 0) {
441                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
442                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
443                 }
444
445                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
446                         local->fif_fcsfail--;
447                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
448                         local->fif_plcpfail--;
449                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
450                         local->fif_pspoll--;
451                         local->fif_control--;
452                 }
453                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
454                         local->fif_other_bss--;
455
456                 ieee80211_configure_filter(local);
457                 break;
458         case NL80211_IFTYPE_STATION:
459                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
460                 del_timer_sync(&sdata->u.mgd.timer);
461                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
462                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
463                 /*
464                  * If any of the timers fired while we waited for it, it will
465                  * have queued its work. Now the work will be running again
466                  * but will not rearm the timer again because it checks
467                  * whether the interface is running, which, at this point,
468                  * it no longer is.
469                  */
470                 cancel_work_sync(&sdata->u.mgd.work);
471                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
472                 cancel_work_sync(&sdata->u.mgd.monitor_work);
473                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
474
475                 /*
476                  * When we get here, the interface is marked down.
477                  * Call synchronize_rcu() to wait for the RX path
478                  * should it be using the interface and enqueuing
479                  * frames at this very time on another CPU.
480                  */
481                 synchronize_rcu();
482                 skb_queue_purge(&sdata->u.mgd.skb_queue);
483                 /* fall through */
484         case NL80211_IFTYPE_ADHOC:
485                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
486                         del_timer_sync(&sdata->u.ibss.timer);
487                         cancel_work_sync(&sdata->u.ibss.work);
488                         synchronize_rcu();
489                         skb_queue_purge(&sdata->u.ibss.skb_queue);
490                 }
491                 /* fall through */
492         case NL80211_IFTYPE_MESH_POINT:
493                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
494                         /* other_bss and allmulti are always set on mesh
495                          * ifaces */
496                         local->fif_other_bss--;
497                         atomic_dec(&local->iff_allmultis);
498
499                         ieee80211_configure_filter(local);
500
501                         ieee80211_stop_mesh(sdata);
502                 }
503                 /* fall through */
504         default:
505                 if (local->scan_sdata == sdata) {
506                         if (!local->ops->hw_scan)
507                                 cancel_delayed_work_sync(&local->scan_work);
508                         /*
509                          * The software scan can no longer run now, so we can
510                          * clear out the scan_sdata reference. However, the
511                          * hardware scan may still be running. The complete
512                          * function must be prepared to handle a NULL value.
513                          */
514                         local->scan_sdata = NULL;
515                         /*
516                          * The memory barrier guarantees that another CPU
517                          * that is hardware-scanning will now see the fact
518                          * that this interface is gone.
519                          */
520                         smp_mb();
521                         /*
522                          * If software scanning, complete the scan but since
523                          * the scan_sdata is NULL already don't send out a
524                          * scan event to userspace -- the scan is incomplete.
525                          */
526                         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
527                                 ieee80211_scan_completed(&local->hw, true);
528                 }
529
530                 /*
531                  * Disable beaconing for AP and mesh, IBSS can't
532                  * still be joined to a network at this point.
533                  */
534                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
535                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
536                         ieee80211_bss_info_change_notify(sdata,
537                                 BSS_CHANGED_BEACON_ENABLED);
538                 }
539
540                 conf.vif = &sdata->vif;
541                 conf.type = sdata->vif.type;
542                 conf.mac_addr = dev->dev_addr;
543                 /* disable all keys for as long as this netdev is down */
544                 ieee80211_disable_keys(sdata);
545                 drv_remove_interface(local, &conf);
546         }
547
548         sdata->bss = NULL;
549
550         hw_reconf_flags |= __ieee80211_recalc_idle(local);
551
552         ieee80211_recalc_ps(local, -1);
553
554         if (local->open_count == 0) {
555                 drv_stop(local);
556
557                 ieee80211_led_radio(local, false);
558
559                 flush_workqueue(local->workqueue);
560
561                 tasklet_disable(&local->tx_pending_tasklet);
562                 tasklet_disable(&local->tasklet);
563
564                 /* no reconfiguring after stop! */
565                 hw_reconf_flags = 0;
566         }
567
568         /* do after stop to avoid reconfiguring when we stop anyway */
569         if (hw_reconf_flags)
570                 ieee80211_hw_config(local, hw_reconf_flags);
571
572         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
573         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
574                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
575                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
576                         if (info->control.vif == &sdata->vif) {
577                                 __skb_unlink(skb, &local->pending[i]);
578                                 dev_kfree_skb_irq(skb);
579                         }
580                 }
581         }
582         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
583
584         return 0;
585 }
586
587 static void ieee80211_set_multicast_list(struct net_device *dev)
588 {
589         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
590         struct ieee80211_local *local = sdata->local;
591         int allmulti, promisc, sdata_allmulti, sdata_promisc;
592
593         allmulti = !!(dev->flags & IFF_ALLMULTI);
594         promisc = !!(dev->flags & IFF_PROMISC);
595         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
596         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
597
598         if (allmulti != sdata_allmulti) {
599                 if (dev->flags & IFF_ALLMULTI)
600                         atomic_inc(&local->iff_allmultis);
601                 else
602                         atomic_dec(&local->iff_allmultis);
603                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
604         }
605
606         if (promisc != sdata_promisc) {
607                 if (dev->flags & IFF_PROMISC)
608                         atomic_inc(&local->iff_promiscs);
609                 else
610                         atomic_dec(&local->iff_promiscs);
611                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
612         }
613         spin_lock_bh(&local->filter_lock);
614         __dev_addr_sync(&local->mc_list, &local->mc_count,
615                         &dev->mc_list, &dev->mc_count);
616         spin_unlock_bh(&local->filter_lock);
617         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
618 }
619
620 /*
621  * Called when the netdev is removed or, by the code below, before
622  * the interface type changes.
623  */
624 static void ieee80211_teardown_sdata(struct net_device *dev)
625 {
626         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
627         struct ieee80211_local *local = sdata->local;
628         struct beacon_data *beacon;
629         struct sk_buff *skb;
630         int flushed;
631         int i;
632
633         /* free extra data */
634         ieee80211_free_keys(sdata);
635
636         ieee80211_debugfs_remove_netdev(sdata);
637
638         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
639                 __skb_queue_purge(&sdata->fragments[i].skb_list);
640         sdata->fragment_next = 0;
641
642         switch (sdata->vif.type) {
643         case NL80211_IFTYPE_AP:
644                 beacon = sdata->u.ap.beacon;
645                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
646                 synchronize_rcu();
647                 kfree(beacon);
648
649                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
650                         local->total_ps_buffered--;
651                         dev_kfree_skb(skb);
652                 }
653
654                 break;
655         case NL80211_IFTYPE_MESH_POINT:
656                 if (ieee80211_vif_is_mesh(&sdata->vif))
657                         mesh_rmc_free(sdata);
658                 break;
659         case NL80211_IFTYPE_ADHOC:
660                 if (WARN_ON(sdata->u.ibss.presp))
661                         kfree_skb(sdata->u.ibss.presp);
662                 break;
663         case NL80211_IFTYPE_STATION:
664         case NL80211_IFTYPE_WDS:
665         case NL80211_IFTYPE_AP_VLAN:
666         case NL80211_IFTYPE_MONITOR:
667                 break;
668         case NL80211_IFTYPE_UNSPECIFIED:
669         case __NL80211_IFTYPE_AFTER_LAST:
670                 BUG();
671                 break;
672         }
673
674         flushed = sta_info_flush(local, sdata);
675         WARN_ON(flushed);
676 }
677
678 static const struct net_device_ops ieee80211_dataif_ops = {
679         .ndo_open               = ieee80211_open,
680         .ndo_stop               = ieee80211_stop,
681         .ndo_uninit             = ieee80211_teardown_sdata,
682         .ndo_start_xmit         = ieee80211_subif_start_xmit,
683         .ndo_set_multicast_list = ieee80211_set_multicast_list,
684         .ndo_change_mtu         = ieee80211_change_mtu,
685         .ndo_set_mac_address    = eth_mac_addr,
686 };
687
688 static const struct net_device_ops ieee80211_monitorif_ops = {
689         .ndo_open               = ieee80211_open,
690         .ndo_stop               = ieee80211_stop,
691         .ndo_uninit             = ieee80211_teardown_sdata,
692         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
693         .ndo_set_multicast_list = ieee80211_set_multicast_list,
694         .ndo_change_mtu         = ieee80211_change_mtu,
695         .ndo_set_mac_address    = eth_mac_addr,
696 };
697
698 static void ieee80211_if_setup(struct net_device *dev)
699 {
700         ether_setup(dev);
701         dev->netdev_ops = &ieee80211_dataif_ops;
702         dev->destructor = free_netdev;
703 }
704
705 /*
706  * Helper function to initialise an interface to a specific type.
707  */
708 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
709                                   enum nl80211_iftype type)
710 {
711         /* clear type-dependent union */
712         memset(&sdata->u, 0, sizeof(sdata->u));
713
714         /* and set some type-dependent values */
715         sdata->vif.type = type;
716         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
717         sdata->wdev.iftype = type;
718
719         /* only monitor differs */
720         sdata->dev->type = ARPHRD_ETHER;
721
722         switch (type) {
723         case NL80211_IFTYPE_AP:
724                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
725                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
726                 break;
727         case NL80211_IFTYPE_STATION:
728                 ieee80211_sta_setup_sdata(sdata);
729                 break;
730         case NL80211_IFTYPE_ADHOC:
731                 ieee80211_ibss_setup_sdata(sdata);
732                 break;
733         case NL80211_IFTYPE_MESH_POINT:
734                 if (ieee80211_vif_is_mesh(&sdata->vif))
735                         ieee80211_mesh_init_sdata(sdata);
736                 break;
737         case NL80211_IFTYPE_MONITOR:
738                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
739                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
740                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
741                                       MONITOR_FLAG_OTHER_BSS;
742                 break;
743         case NL80211_IFTYPE_WDS:
744         case NL80211_IFTYPE_AP_VLAN:
745                 break;
746         case NL80211_IFTYPE_UNSPECIFIED:
747         case __NL80211_IFTYPE_AFTER_LAST:
748                 BUG();
749                 break;
750         }
751
752         ieee80211_debugfs_add_netdev(sdata);
753 }
754
755 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
756                              enum nl80211_iftype type)
757 {
758         ASSERT_RTNL();
759
760         if (type == sdata->vif.type)
761                 return 0;
762
763         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
764         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
765             type == NL80211_IFTYPE_ADHOC)
766                 return -EOPNOTSUPP;
767
768         /*
769          * We could, here, on changes between IBSS/STA/MESH modes,
770          * invoke an MLME function instead that disassociates etc.
771          * and goes into the requested mode.
772          */
773
774         if (netif_running(sdata->dev))
775                 return -EBUSY;
776
777         /* Purge and reset type-dependent state. */
778         ieee80211_teardown_sdata(sdata->dev);
779         ieee80211_setup_sdata(sdata, type);
780
781         /* reset some values that shouldn't be kept across type changes */
782         sdata->vif.bss_conf.basic_rates =
783                 ieee80211_mandatory_rates(sdata->local,
784                         sdata->local->hw.conf.channel->band);
785         sdata->drop_unencrypted = 0;
786
787         return 0;
788 }
789
790 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
791                      struct net_device **new_dev, enum nl80211_iftype type,
792                      struct vif_params *params)
793 {
794         struct net_device *ndev;
795         struct ieee80211_sub_if_data *sdata = NULL;
796         int ret, i;
797
798         ASSERT_RTNL();
799
800         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
801                             name, ieee80211_if_setup);
802         if (!ndev)
803                 return -ENOMEM;
804         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
805
806         ndev->needed_headroom = local->tx_headroom +
807                                 4*6 /* four MAC addresses */
808                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
809                                 + 6 /* mesh */
810                                 + 8 /* rfc1042/bridge tunnel */
811                                 - ETH_HLEN /* ethernet hard_header_len */
812                                 + IEEE80211_ENCRYPT_HEADROOM;
813         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
814
815         ret = dev_alloc_name(ndev, ndev->name);
816         if (ret < 0)
817                 goto fail;
818
819         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
820         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
821
822         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
823         sdata = netdev_priv(ndev);
824         ndev->ieee80211_ptr = &sdata->wdev;
825
826         /* initialise type-independent data */
827         sdata->wdev.wiphy = local->hw.wiphy;
828         sdata->local = local;
829         sdata->dev = ndev;
830
831         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
832                 skb_queue_head_init(&sdata->fragments[i].skb_list);
833
834         INIT_LIST_HEAD(&sdata->key_list);
835
836         sdata->force_unicast_rateidx = -1;
837         sdata->max_ratectrl_rateidx = -1;
838
839         /* setup type-dependent data */
840         ieee80211_setup_sdata(sdata, type);
841
842         ret = register_netdevice(ndev);
843         if (ret)
844                 goto fail;
845
846         if (ieee80211_vif_is_mesh(&sdata->vif) &&
847             params && params->mesh_id_len)
848                 ieee80211_sdata_set_mesh_id(sdata,
849                                             params->mesh_id_len,
850                                             params->mesh_id);
851
852         mutex_lock(&local->iflist_mtx);
853         list_add_tail_rcu(&sdata->list, &local->interfaces);
854         mutex_unlock(&local->iflist_mtx);
855
856         if (new_dev)
857                 *new_dev = ndev;
858
859         return 0;
860
861  fail:
862         free_netdev(ndev);
863         return ret;
864 }
865
866 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
867 {
868         ASSERT_RTNL();
869
870         mutex_lock(&sdata->local->iflist_mtx);
871         list_del_rcu(&sdata->list);
872         mutex_unlock(&sdata->local->iflist_mtx);
873
874         synchronize_rcu();
875         unregister_netdevice(sdata->dev);
876 }
877
878 /*
879  * Remove all interfaces, may only be called at hardware unregistration
880  * time because it doesn't do RCU-safe list removals.
881  */
882 void ieee80211_remove_interfaces(struct ieee80211_local *local)
883 {
884         struct ieee80211_sub_if_data *sdata, *tmp;
885
886         ASSERT_RTNL();
887
888         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
889                 /*
890                  * we cannot hold the iflist_mtx across unregister_netdevice,
891                  * but we only need to hold it for list modifications to lock
892                  * out readers since we're under the RTNL here as all other
893                  * writers.
894                  */
895                 mutex_lock(&local->iflist_mtx);
896                 list_del(&sdata->list);
897                 mutex_unlock(&local->iflist_mtx);
898
899                 unregister_netdevice(sdata->dev);
900         }
901 }
902
903 static u32 ieee80211_idle_off(struct ieee80211_local *local,
904                               const char *reason)
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 no longer idle - %s\n",
911                wiphy_name(local->hw.wiphy), reason);
912 #endif
913
914         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
915         return IEEE80211_CONF_CHANGE_IDLE;
916 }
917
918 static u32 ieee80211_idle_on(struct ieee80211_local *local)
919 {
920         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
921                 return 0;
922
923 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
924         printk(KERN_DEBUG "%s: device now idle\n",
925                wiphy_name(local->hw.wiphy));
926 #endif
927
928         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
929         return IEEE80211_CONF_CHANGE_IDLE;
930 }
931
932 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
933 {
934         struct ieee80211_sub_if_data *sdata;
935         int count = 0;
936
937         if (local->scanning)
938                 return ieee80211_idle_off(local, "scanning");
939
940         list_for_each_entry(sdata, &local->interfaces, list) {
941                 if (!netif_running(sdata->dev))
942                         continue;
943                 /* do not count disabled managed interfaces */
944                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
945                     !sdata->u.mgd.associated &&
946                     list_empty(&sdata->u.mgd.work_list))
947                         continue;
948                 /* do not count unused IBSS interfaces */
949                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
950                     !sdata->u.ibss.ssid_len)
951                         continue;
952                 /* count everything else */
953                 count++;
954         }
955
956         if (!count)
957                 return ieee80211_idle_on(local);
958         else
959                 return ieee80211_idle_off(local, "in use");
960
961         return 0;
962 }
963
964 void ieee80211_recalc_idle(struct ieee80211_local *local)
965 {
966         u32 chg;
967
968         mutex_lock(&local->iflist_mtx);
969         chg = __ieee80211_recalc_idle(local);
970         mutex_unlock(&local->iflist_mtx);
971         if (chg)
972                 ieee80211_hw_config(local, chg);
973 }