mac80211: Speedup ieee80211_remove_interfaces()
[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                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
192                 }
193         }
194
195         /*
196          * Validate the MAC address for this device.
197          */
198         if (!is_valid_ether_addr(dev->dev_addr)) {
199                 if (!local->open_count)
200                         drv_stop(local);
201                 return -EADDRNOTAVAIL;
202         }
203
204         switch (sdata->vif.type) {
205         case NL80211_IFTYPE_AP_VLAN:
206                 /* no need to tell driver */
207                 break;
208         case NL80211_IFTYPE_MONITOR:
209                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
210                         local->cooked_mntrs++;
211                         break;
212                 }
213
214                 /* must be before the call to ieee80211_configure_filter */
215                 local->monitors++;
216                 if (local->monitors == 1) {
217                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
218                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
219                 }
220
221                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
222                         local->fif_fcsfail++;
223                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
224                         local->fif_plcpfail++;
225                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
226                         local->fif_control++;
227                         local->fif_pspoll++;
228                 }
229                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
230                         local->fif_other_bss++;
231
232                 ieee80211_configure_filter(local);
233                 break;
234         default:
235                 conf.vif = &sdata->vif;
236                 conf.type = sdata->vif.type;
237                 conf.mac_addr = dev->dev_addr;
238                 res = drv_add_interface(local, &conf);
239                 if (res)
240                         goto err_stop;
241
242                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
243                         local->fif_other_bss++;
244                         ieee80211_configure_filter(local);
245
246                         ieee80211_start_mesh(sdata);
247                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
248                         local->fif_pspoll++;
249
250                         ieee80211_configure_filter(local);
251                 }
252
253                 changed |= ieee80211_reset_erp_info(sdata);
254                 ieee80211_bss_info_change_notify(sdata, changed);
255                 ieee80211_enable_keys(sdata);
256
257                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
258                         netif_carrier_off(dev);
259                 else
260                         netif_carrier_on(dev);
261         }
262
263         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
264                 /* Create STA entry for the WDS peer */
265                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
266                                      GFP_KERNEL);
267                 if (!sta) {
268                         res = -ENOMEM;
269                         goto err_del_interface;
270                 }
271
272                 /* no locking required since STA is not live yet */
273                 sta->flags |= WLAN_STA_AUTHORIZED;
274
275                 res = sta_info_insert(sta);
276                 if (res) {
277                         /* STA has been freed */
278                         goto err_del_interface;
279                 }
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                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
316
317         netif_start_queue(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_stop_queue(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         if (sdata->vif.type == NL80211_IFTYPE_AP)
392                 local->fif_pspoll--;
393
394         netif_addr_lock_bh(dev);
395         spin_lock_bh(&local->filter_lock);
396         __dev_addr_unsync(&local->mc_list, &local->mc_count,
397                           &dev->mc_list, &dev->mc_count);
398         spin_unlock_bh(&local->filter_lock);
399         netif_addr_unlock_bh(dev);
400
401         ieee80211_configure_filter(local);
402
403         del_timer_sync(&local->dynamic_ps_timer);
404         cancel_work_sync(&local->dynamic_ps_enable_work);
405
406         /* APs need special treatment */
407         if (sdata->vif.type == NL80211_IFTYPE_AP) {
408                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
409                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
410
411                 /* remove beacon */
412                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
413                 synchronize_rcu();
414                 kfree(old_beacon);
415
416                 /* down all dependent devices, that is VLANs */
417                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
418                                          u.vlan.list)
419                         dev_close(vlan->dev);
420                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
421         }
422
423         local->open_count--;
424
425         switch (sdata->vif.type) {
426         case NL80211_IFTYPE_AP_VLAN:
427                 list_del(&sdata->u.vlan.list);
428                 /* no need to tell driver */
429                 break;
430         case NL80211_IFTYPE_MONITOR:
431                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
432                         local->cooked_mntrs--;
433                         break;
434                 }
435
436                 local->monitors--;
437                 if (local->monitors == 0) {
438                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
439                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
440                 }
441
442                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
443                         local->fif_fcsfail--;
444                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
445                         local->fif_plcpfail--;
446                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
447                         local->fif_pspoll--;
448                         local->fif_control--;
449                 }
450                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
451                         local->fif_other_bss--;
452
453                 ieee80211_configure_filter(local);
454                 break;
455         case NL80211_IFTYPE_STATION:
456                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
457                 del_timer_sync(&sdata->u.mgd.timer);
458                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
459                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
460                 /*
461                  * If any of the timers fired while we waited for it, it will
462                  * have queued its work. Now the work will be running again
463                  * but will not rearm the timer again because it checks
464                  * whether the interface is running, which, at this point,
465                  * it no longer is.
466                  */
467                 cancel_work_sync(&sdata->u.mgd.work);
468                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
469                 cancel_work_sync(&sdata->u.mgd.monitor_work);
470                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
471
472                 /*
473                  * When we get here, the interface is marked down.
474                  * Call synchronize_rcu() to wait for the RX path
475                  * should it be using the interface and enqueuing
476                  * frames at this very time on another CPU.
477                  */
478                 synchronize_rcu();
479                 skb_queue_purge(&sdata->u.mgd.skb_queue);
480                 /* fall through */
481         case NL80211_IFTYPE_ADHOC:
482                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
483                         del_timer_sync(&sdata->u.ibss.timer);
484                         cancel_work_sync(&sdata->u.ibss.work);
485                         synchronize_rcu();
486                         skb_queue_purge(&sdata->u.ibss.skb_queue);
487                 }
488                 /* fall through */
489         case NL80211_IFTYPE_MESH_POINT:
490                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
491                         /* other_bss and allmulti are always set on mesh
492                          * ifaces */
493                         local->fif_other_bss--;
494                         atomic_dec(&local->iff_allmultis);
495
496                         ieee80211_configure_filter(local);
497
498                         ieee80211_stop_mesh(sdata);
499                 }
500                 /* fall through */
501         default:
502                 if (local->scan_sdata == sdata)
503                         ieee80211_scan_cancel(local);
504
505                 /*
506                  * Disable beaconing for AP and mesh, IBSS can't
507                  * still be joined to a network at this point.
508                  */
509                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
510                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
511                         ieee80211_bss_info_change_notify(sdata,
512                                 BSS_CHANGED_BEACON_ENABLED);
513                 }
514
515                 conf.vif = &sdata->vif;
516                 conf.type = sdata->vif.type;
517                 conf.mac_addr = dev->dev_addr;
518                 /* disable all keys for as long as this netdev is down */
519                 ieee80211_disable_keys(sdata);
520                 drv_remove_interface(local, &conf);
521         }
522
523         sdata->bss = NULL;
524
525         hw_reconf_flags |= __ieee80211_recalc_idle(local);
526
527         ieee80211_recalc_ps(local, -1);
528
529         if (local->open_count == 0) {
530                 ieee80211_clear_tx_pending(local);
531                 ieee80211_stop_device(local);
532
533                 /* no reconfiguring after stop! */
534                 hw_reconf_flags = 0;
535         }
536
537         /* do after stop to avoid reconfiguring when we stop anyway */
538         if (hw_reconf_flags)
539                 ieee80211_hw_config(local, hw_reconf_flags);
540
541         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
542         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
543                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
544                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
545                         if (info->control.vif == &sdata->vif) {
546                                 __skb_unlink(skb, &local->pending[i]);
547                                 dev_kfree_skb_irq(skb);
548                         }
549                 }
550         }
551         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
552
553         return 0;
554 }
555
556 static void ieee80211_set_multicast_list(struct net_device *dev)
557 {
558         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
559         struct ieee80211_local *local = sdata->local;
560         int allmulti, promisc, sdata_allmulti, sdata_promisc;
561
562         allmulti = !!(dev->flags & IFF_ALLMULTI);
563         promisc = !!(dev->flags & IFF_PROMISC);
564         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
565         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
566
567         if (allmulti != sdata_allmulti) {
568                 if (dev->flags & IFF_ALLMULTI)
569                         atomic_inc(&local->iff_allmultis);
570                 else
571                         atomic_dec(&local->iff_allmultis);
572                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
573         }
574
575         if (promisc != sdata_promisc) {
576                 if (dev->flags & IFF_PROMISC)
577                         atomic_inc(&local->iff_promiscs);
578                 else
579                         atomic_dec(&local->iff_promiscs);
580                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
581         }
582         spin_lock_bh(&local->filter_lock);
583         __dev_addr_sync(&local->mc_list, &local->mc_count,
584                         &dev->mc_list, &dev->mc_count);
585         spin_unlock_bh(&local->filter_lock);
586         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
587 }
588
589 /*
590  * Called when the netdev is removed or, by the code below, before
591  * the interface type changes.
592  */
593 static void ieee80211_teardown_sdata(struct net_device *dev)
594 {
595         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
596         struct ieee80211_local *local = sdata->local;
597         struct beacon_data *beacon;
598         struct sk_buff *skb;
599         int flushed;
600         int i;
601
602         /* free extra data */
603         ieee80211_free_keys(sdata);
604
605         ieee80211_debugfs_remove_netdev(sdata);
606
607         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
608                 __skb_queue_purge(&sdata->fragments[i].skb_list);
609         sdata->fragment_next = 0;
610
611         switch (sdata->vif.type) {
612         case NL80211_IFTYPE_AP:
613                 beacon = sdata->u.ap.beacon;
614                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
615                 synchronize_rcu();
616                 kfree(beacon);
617
618                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
619                         local->total_ps_buffered--;
620                         dev_kfree_skb(skb);
621                 }
622
623                 break;
624         case NL80211_IFTYPE_MESH_POINT:
625                 if (ieee80211_vif_is_mesh(&sdata->vif))
626                         mesh_rmc_free(sdata);
627                 break;
628         case NL80211_IFTYPE_ADHOC:
629                 if (WARN_ON(sdata->u.ibss.presp))
630                         kfree_skb(sdata->u.ibss.presp);
631                 break;
632         case NL80211_IFTYPE_STATION:
633         case NL80211_IFTYPE_WDS:
634         case NL80211_IFTYPE_AP_VLAN:
635         case NL80211_IFTYPE_MONITOR:
636                 break;
637         case NL80211_IFTYPE_UNSPECIFIED:
638         case __NL80211_IFTYPE_AFTER_LAST:
639                 BUG();
640                 break;
641         }
642
643         flushed = sta_info_flush(local, sdata);
644         WARN_ON(flushed);
645 }
646
647 static const struct net_device_ops ieee80211_dataif_ops = {
648         .ndo_open               = ieee80211_open,
649         .ndo_stop               = ieee80211_stop,
650         .ndo_uninit             = ieee80211_teardown_sdata,
651         .ndo_start_xmit         = ieee80211_subif_start_xmit,
652         .ndo_set_multicast_list = ieee80211_set_multicast_list,
653         .ndo_change_mtu         = ieee80211_change_mtu,
654         .ndo_set_mac_address    = eth_mac_addr,
655 };
656
657 static const struct net_device_ops ieee80211_monitorif_ops = {
658         .ndo_open               = ieee80211_open,
659         .ndo_stop               = ieee80211_stop,
660         .ndo_uninit             = ieee80211_teardown_sdata,
661         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
662         .ndo_set_multicast_list = ieee80211_set_multicast_list,
663         .ndo_change_mtu         = ieee80211_change_mtu,
664         .ndo_set_mac_address    = eth_mac_addr,
665 };
666
667 static void ieee80211_if_setup(struct net_device *dev)
668 {
669         ether_setup(dev);
670         dev->netdev_ops = &ieee80211_dataif_ops;
671         dev->destructor = free_netdev;
672 }
673
674 /*
675  * Helper function to initialise an interface to a specific type.
676  */
677 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
678                                   enum nl80211_iftype type)
679 {
680         /* clear type-dependent union */
681         memset(&sdata->u, 0, sizeof(sdata->u));
682
683         /* and set some type-dependent values */
684         sdata->vif.type = type;
685         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
686         sdata->wdev.iftype = type;
687
688         /* only monitor differs */
689         sdata->dev->type = ARPHRD_ETHER;
690
691         switch (type) {
692         case NL80211_IFTYPE_AP:
693                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
694                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
695                 break;
696         case NL80211_IFTYPE_STATION:
697                 ieee80211_sta_setup_sdata(sdata);
698                 break;
699         case NL80211_IFTYPE_ADHOC:
700                 ieee80211_ibss_setup_sdata(sdata);
701                 break;
702         case NL80211_IFTYPE_MESH_POINT:
703                 if (ieee80211_vif_is_mesh(&sdata->vif))
704                         ieee80211_mesh_init_sdata(sdata);
705                 break;
706         case NL80211_IFTYPE_MONITOR:
707                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
708                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
709                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
710                                       MONITOR_FLAG_OTHER_BSS;
711                 break;
712         case NL80211_IFTYPE_WDS:
713         case NL80211_IFTYPE_AP_VLAN:
714                 break;
715         case NL80211_IFTYPE_UNSPECIFIED:
716         case __NL80211_IFTYPE_AFTER_LAST:
717                 BUG();
718                 break;
719         }
720
721         ieee80211_debugfs_add_netdev(sdata);
722 }
723
724 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
725                              enum nl80211_iftype type)
726 {
727         ASSERT_RTNL();
728
729         if (type == sdata->vif.type)
730                 return 0;
731
732         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
733         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
734             type == NL80211_IFTYPE_ADHOC)
735                 return -EOPNOTSUPP;
736
737         /*
738          * We could, here, on changes between IBSS/STA/MESH modes,
739          * invoke an MLME function instead that disassociates etc.
740          * and goes into the requested mode.
741          */
742
743         if (netif_running(sdata->dev))
744                 return -EBUSY;
745
746         /* Purge and reset type-dependent state. */
747         ieee80211_teardown_sdata(sdata->dev);
748         ieee80211_setup_sdata(sdata, type);
749
750         /* reset some values that shouldn't be kept across type changes */
751         sdata->vif.bss_conf.basic_rates =
752                 ieee80211_mandatory_rates(sdata->local,
753                         sdata->local->hw.conf.channel->band);
754         sdata->drop_unencrypted = 0;
755         if (type == NL80211_IFTYPE_STATION)
756                 sdata->u.mgd.use_4addr = false;
757
758         return 0;
759 }
760
761 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
762                      struct net_device **new_dev, enum nl80211_iftype type,
763                      struct vif_params *params)
764 {
765         struct net_device *ndev;
766         struct ieee80211_sub_if_data *sdata = NULL;
767         int ret, i;
768
769         ASSERT_RTNL();
770
771         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
772                             name, ieee80211_if_setup);
773         if (!ndev)
774                 return -ENOMEM;
775         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
776
777         ndev->needed_headroom = local->tx_headroom +
778                                 4*6 /* four MAC addresses */
779                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
780                                 + 6 /* mesh */
781                                 + 8 /* rfc1042/bridge tunnel */
782                                 - ETH_HLEN /* ethernet hard_header_len */
783                                 + IEEE80211_ENCRYPT_HEADROOM;
784         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
785
786         ret = dev_alloc_name(ndev, ndev->name);
787         if (ret < 0)
788                 goto fail;
789
790         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
791         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
792         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
793
794         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
795         sdata = netdev_priv(ndev);
796         ndev->ieee80211_ptr = &sdata->wdev;
797
798         /* initialise type-independent data */
799         sdata->wdev.wiphy = local->hw.wiphy;
800         sdata->local = local;
801         sdata->dev = ndev;
802
803         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
804                 skb_queue_head_init(&sdata->fragments[i].skb_list);
805
806         INIT_LIST_HEAD(&sdata->key_list);
807
808         sdata->force_unicast_rateidx = -1;
809         sdata->max_ratectrl_rateidx = -1;
810
811         /* setup type-dependent data */
812         ieee80211_setup_sdata(sdata, type);
813
814         if (params) {
815                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
816                 if (type == NL80211_IFTYPE_STATION)
817                         sdata->u.mgd.use_4addr = params->use_4addr;
818         }
819
820         ret = register_netdevice(ndev);
821         if (ret)
822                 goto fail;
823
824         if (ieee80211_vif_is_mesh(&sdata->vif) &&
825             params && params->mesh_id_len)
826                 ieee80211_sdata_set_mesh_id(sdata,
827                                             params->mesh_id_len,
828                                             params->mesh_id);
829
830         mutex_lock(&local->iflist_mtx);
831         list_add_tail_rcu(&sdata->list, &local->interfaces);
832         mutex_unlock(&local->iflist_mtx);
833
834         if (new_dev)
835                 *new_dev = ndev;
836
837         return 0;
838
839  fail:
840         free_netdev(ndev);
841         return ret;
842 }
843
844 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
845 {
846         ASSERT_RTNL();
847
848         mutex_lock(&sdata->local->iflist_mtx);
849         list_del_rcu(&sdata->list);
850         mutex_unlock(&sdata->local->iflist_mtx);
851
852         synchronize_rcu();
853         unregister_netdevice(sdata->dev);
854 }
855
856 /*
857  * Remove all interfaces, may only be called at hardware unregistration
858  * time because it doesn't do RCU-safe list removals.
859  */
860 void ieee80211_remove_interfaces(struct ieee80211_local *local)
861 {
862         struct ieee80211_sub_if_data *sdata, *tmp;
863         LIST_HEAD(unreg_list);
864
865         ASSERT_RTNL();
866
867         mutex_lock(&local->iflist_mtx);
868         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
869                 list_del(&sdata->list);
870
871                 unregister_netdevice_queue(sdata->dev, &unreg_list);
872         }
873         mutex_unlock(&local->iflist_mtx);
874         unregister_netdevice_many(&unreg_list);
875 }
876
877 static u32 ieee80211_idle_off(struct ieee80211_local *local,
878                               const char *reason)
879 {
880         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
881                 return 0;
882
883 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
884         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
885                wiphy_name(local->hw.wiphy), reason);
886 #endif
887
888         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
889         return IEEE80211_CONF_CHANGE_IDLE;
890 }
891
892 static u32 ieee80211_idle_on(struct ieee80211_local *local)
893 {
894         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
895                 return 0;
896
897 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
898         printk(KERN_DEBUG "%s: device now idle\n",
899                wiphy_name(local->hw.wiphy));
900 #endif
901
902         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
903         return IEEE80211_CONF_CHANGE_IDLE;
904 }
905
906 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
907 {
908         struct ieee80211_sub_if_data *sdata;
909         int count = 0;
910
911         if (local->scanning)
912                 return ieee80211_idle_off(local, "scanning");
913
914         list_for_each_entry(sdata, &local->interfaces, list) {
915                 if (!netif_running(sdata->dev))
916                         continue;
917                 /* do not count disabled managed interfaces */
918                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
919                     !sdata->u.mgd.associated &&
920                     list_empty(&sdata->u.mgd.work_list))
921                         continue;
922                 /* do not count unused IBSS interfaces */
923                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
924                     !sdata->u.ibss.ssid_len)
925                         continue;
926                 /* count everything else */
927                 count++;
928         }
929
930         if (!count)
931                 return ieee80211_idle_on(local);
932         else
933                 return ieee80211_idle_off(local, "in use");
934
935         return 0;
936 }
937
938 void ieee80211_recalc_idle(struct ieee80211_local *local)
939 {
940         u32 chg;
941
942         mutex_lock(&local->iflist_mtx);
943         chg = __ieee80211_recalc_idle(local);
944         mutex_unlock(&local->iflist_mtx);
945         if (chg)
946                 ieee80211_hw_config(local, chg);
947 }