Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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
24 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
25 {
26         int meshhdrlen;
27         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
28
29         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
30
31         /* FIX: what would be proper limits for MTU?
32          * This interface uses 802.3 frames. */
33         if (new_mtu < 256 ||
34             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
35                 return -EINVAL;
36         }
37
38 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
39         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
40 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
41         dev->mtu = new_mtu;
42         return 0;
43 }
44
45 static inline int identical_mac_addr_allowed(int type1, int type2)
46 {
47         return type1 == NL80211_IFTYPE_MONITOR ||
48                 type2 == NL80211_IFTYPE_MONITOR ||
49                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
50                 (type1 == NL80211_IFTYPE_WDS &&
51                         (type2 == NL80211_IFTYPE_WDS ||
52                          type2 == NL80211_IFTYPE_AP)) ||
53                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
54                 (type1 == NL80211_IFTYPE_AP_VLAN &&
55                         (type2 == NL80211_IFTYPE_AP ||
56                          type2 == NL80211_IFTYPE_AP_VLAN));
57 }
58
59 static int ieee80211_open(struct net_device *dev)
60 {
61         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
62         struct ieee80211_sub_if_data *nsdata;
63         struct ieee80211_local *local = sdata->local;
64         struct sta_info *sta;
65         struct ieee80211_if_init_conf conf;
66         u32 changed = 0;
67         int res;
68         u32 hw_reconf_flags = 0;
69         u8 null_addr[ETH_ALEN] = {0};
70
71         /* fail early if user set an invalid address */
72         if (compare_ether_addr(dev->dev_addr, null_addr) &&
73             !is_valid_ether_addr(dev->dev_addr))
74                 return -EADDRNOTAVAIL;
75
76         /* we hold the RTNL here so can safely walk the list */
77         list_for_each_entry(nsdata, &local->interfaces, list) {
78                 struct net_device *ndev = nsdata->dev;
79
80                 if (ndev != dev && netif_running(ndev)) {
81                         /*
82                          * Allow only a single IBSS interface to be up at any
83                          * time. This is restricted because beacon distribution
84                          * cannot work properly if both are in the same IBSS.
85                          *
86                          * To remove this restriction we'd have to disallow them
87                          * from setting the same SSID on different IBSS interfaces
88                          * belonging to the same hardware. Then, however, we're
89                          * faced with having to adopt two different TSF timers...
90                          */
91                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
92                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
93                                 return -EBUSY;
94
95                         /*
96                          * The remaining checks are only performed for interfaces
97                          * with the same MAC address.
98                          */
99                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
100                                 continue;
101
102                         /*
103                          * check whether it may have the same address
104                          */
105                         if (!identical_mac_addr_allowed(sdata->vif.type,
106                                                         nsdata->vif.type))
107                                 return -ENOTUNIQ;
108
109                         /*
110                          * can only add VLANs to enabled APs
111                          */
112                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
113                             nsdata->vif.type == NL80211_IFTYPE_AP)
114                                 sdata->bss = &nsdata->u.ap;
115                 }
116         }
117
118         switch (sdata->vif.type) {
119         case NL80211_IFTYPE_WDS:
120                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
121                         return -ENOLINK;
122                 break;
123         case NL80211_IFTYPE_AP_VLAN:
124                 if (!sdata->bss)
125                         return -ENOLINK;
126                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
127                 break;
128         case NL80211_IFTYPE_AP:
129                 sdata->bss = &sdata->u.ap;
130                 break;
131         case NL80211_IFTYPE_MESH_POINT:
132                 if (!ieee80211_vif_is_mesh(&sdata->vif))
133                         break;
134                 /* mesh ifaces must set allmulti to forward mcast traffic */
135                 atomic_inc(&local->iff_allmultis);
136                 break;
137         case NL80211_IFTYPE_STATION:
138         case NL80211_IFTYPE_MONITOR:
139         case NL80211_IFTYPE_ADHOC:
140                 /* no special treatment */
141                 break;
142         case NL80211_IFTYPE_UNSPECIFIED:
143         case __NL80211_IFTYPE_AFTER_LAST:
144                 /* cannot happen */
145                 WARN_ON(1);
146                 break;
147         }
148
149         if (local->open_count == 0) {
150                 res = 0;
151                 if (local->ops->start)
152                         res = local->ops->start(local_to_hw(local));
153                 if (res)
154                         goto err_del_bss;
155                 /* we're brought up, everything changes */
156                 hw_reconf_flags = ~0;
157                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
158         }
159
160         /*
161          * Check all interfaces and copy the hopefully now-present
162          * MAC address to those that have the special null one.
163          */
164         list_for_each_entry(nsdata, &local->interfaces, list) {
165                 struct net_device *ndev = nsdata->dev;
166
167                 /*
168                  * No need to check netif_running since we do not allow
169                  * it to start up with this invalid address.
170                  */
171                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
172                         memcpy(ndev->dev_addr,
173                                local->hw.wiphy->perm_addr,
174                                ETH_ALEN);
175         }
176
177         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
178                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
179                        ETH_ALEN);
180
181         /*
182          * Validate the MAC address for this device.
183          */
184         if (!is_valid_ether_addr(dev->dev_addr)) {
185                 if (!local->open_count && local->ops->stop)
186                         local->ops->stop(local_to_hw(local));
187                 return -EADDRNOTAVAIL;
188         }
189
190         switch (sdata->vif.type) {
191         case NL80211_IFTYPE_AP_VLAN:
192                 /* no need to tell driver */
193                 break;
194         case NL80211_IFTYPE_MONITOR:
195                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
196                         local->cooked_mntrs++;
197                         break;
198                 }
199
200                 /* must be before the call to ieee80211_configure_filter */
201                 local->monitors++;
202                 if (local->monitors == 1) {
203                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
204                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
205                 }
206
207                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
208                         local->fif_fcsfail++;
209                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
210                         local->fif_plcpfail++;
211                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
212                         local->fif_control++;
213                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
214                         local->fif_other_bss++;
215
216                 netif_addr_lock_bh(local->mdev);
217                 ieee80211_configure_filter(local);
218                 netif_addr_unlock_bh(local->mdev);
219                 break;
220         case NL80211_IFTYPE_STATION:
221         case NL80211_IFTYPE_ADHOC:
222                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
223                 /* fall through */
224         default:
225                 conf.vif = &sdata->vif;
226                 conf.type = sdata->vif.type;
227                 conf.mac_addr = dev->dev_addr;
228                 res = local->ops->add_interface(local_to_hw(local), &conf);
229                 if (res)
230                         goto err_stop;
231
232                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
233                         local->fif_other_bss++;
234                         netif_addr_lock_bh(local->mdev);
235                         ieee80211_configure_filter(local);
236                         netif_addr_unlock_bh(local->mdev);
237
238                         ieee80211_start_mesh(sdata);
239                 }
240                 changed |= ieee80211_reset_erp_info(sdata);
241                 ieee80211_bss_info_change_notify(sdata, changed);
242                 ieee80211_enable_keys(sdata);
243
244                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
245                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
246                         netif_carrier_off(dev);
247                 else
248                         netif_carrier_on(dev);
249         }
250
251         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
252                 /* Create STA entry for the WDS peer */
253                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
254                                      GFP_KERNEL);
255                 if (!sta) {
256                         res = -ENOMEM;
257                         goto err_del_interface;
258                 }
259
260                 /* no locking required since STA is not live yet */
261                 sta->flags |= WLAN_STA_AUTHORIZED;
262
263                 res = sta_info_insert(sta);
264                 if (res) {
265                         /* STA has been freed */
266                         goto err_del_interface;
267                 }
268         }
269
270         if (local->open_count == 0) {
271                 res = dev_open(local->mdev);
272                 WARN_ON(res);
273                 if (res)
274                         goto err_del_interface;
275                 tasklet_enable(&local->tx_pending_tasklet);
276                 tasklet_enable(&local->tasklet);
277         }
278
279         /*
280          * set_multicast_list will be invoked by the networking core
281          * which will check whether any increments here were done in
282          * error and sync them down to the hardware as filter flags.
283          */
284         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
285                 atomic_inc(&local->iff_allmultis);
286
287         if (sdata->flags & IEEE80211_SDATA_PROMISC)
288                 atomic_inc(&local->iff_promiscs);
289
290         local->open_count++;
291         if (hw_reconf_flags) {
292                 ieee80211_hw_config(local, hw_reconf_flags);
293                 /*
294                  * set default queue parameters so drivers don't
295                  * need to initialise the hardware if the hardware
296                  * doesn't start up with sane defaults
297                  */
298                 ieee80211_set_wmm_default(sdata);
299         }
300
301         /*
302          * ieee80211_sta_work is disabled while network interface
303          * is down. Therefore, some configuration changes may not
304          * yet be effective. Trigger execution of ieee80211_sta_work
305          * to fix this.
306          */
307         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
308             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
309                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
310                 queue_work(local->hw.workqueue, &ifsta->work);
311         }
312
313         netif_tx_start_all_queues(dev);
314
315         return 0;
316  err_del_interface:
317         local->ops->remove_interface(local_to_hw(local), &conf);
318  err_stop:
319         if (!local->open_count && local->ops->stop)
320                 local->ops->stop(local_to_hw(local));
321  err_del_bss:
322         sdata->bss = NULL;
323         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
324                 list_del(&sdata->u.vlan.list);
325         return res;
326 }
327
328 static int ieee80211_stop(struct net_device *dev)
329 {
330         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
331         struct ieee80211_local *local = sdata->local;
332         struct ieee80211_if_init_conf conf;
333         struct sta_info *sta;
334         u32 hw_reconf_flags = 0;
335
336         /*
337          * Stop TX on this interface first.
338          */
339         netif_tx_stop_all_queues(dev);
340
341         /*
342          * Now delete all active aggregation sessions.
343          */
344         rcu_read_lock();
345
346         list_for_each_entry_rcu(sta, &local->sta_list, list) {
347                 if (sta->sdata == sdata)
348                         ieee80211_sta_tear_down_BA_sessions(sdata,
349                                                             sta->sta.addr);
350         }
351
352         rcu_read_unlock();
353
354         /*
355          * Remove all stations associated with this interface.
356          *
357          * This must be done before calling ops->remove_interface()
358          * because otherwise we can later invoke ops->sta_notify()
359          * whenever the STAs are removed, and that invalidates driver
360          * assumptions about always getting a vif pointer that is valid
361          * (because if we remove a STA after ops->remove_interface()
362          * the driver will have removed the vif info already!)
363          *
364          * We could relax this and only unlink the stations from the
365          * hash table and list but keep them on a per-sdata list that
366          * will be inserted back again when the interface is brought
367          * up again, but I don't currently see a use case for that,
368          * except with WDS which gets a STA entry created when it is
369          * brought up.
370          */
371         sta_info_flush(local, sdata);
372
373         /*
374          * Don't count this interface for promisc/allmulti while it
375          * is down. dev_mc_unsync() will invoke set_multicast_list
376          * on the master interface which will sync these down to the
377          * hardware as filter flags.
378          */
379         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
380                 atomic_dec(&local->iff_allmultis);
381
382         if (sdata->flags & IEEE80211_SDATA_PROMISC)
383                 atomic_dec(&local->iff_promiscs);
384
385         dev_mc_unsync(local->mdev, dev);
386
387         /* APs need special treatment */
388         if (sdata->vif.type == NL80211_IFTYPE_AP) {
389                 struct ieee80211_sub_if_data *vlan, *tmp;
390                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
391
392                 /* remove beacon */
393                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
394                 synchronize_rcu();
395                 kfree(old_beacon);
396
397                 /* down all dependent devices, that is VLANs */
398                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
399                                          u.vlan.list)
400                         dev_close(vlan->dev);
401                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
402         }
403
404         local->open_count--;
405
406         switch (sdata->vif.type) {
407         case NL80211_IFTYPE_AP_VLAN:
408                 list_del(&sdata->u.vlan.list);
409                 /* no need to tell driver */
410                 break;
411         case NL80211_IFTYPE_MONITOR:
412                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
413                         local->cooked_mntrs--;
414                         break;
415                 }
416
417                 local->monitors--;
418                 if (local->monitors == 0) {
419                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
420                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
421                 }
422
423                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
424                         local->fif_fcsfail--;
425                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
426                         local->fif_plcpfail--;
427                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
428                         local->fif_control--;
429                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
430                         local->fif_other_bss--;
431
432                 netif_addr_lock_bh(local->mdev);
433                 ieee80211_configure_filter(local);
434                 netif_addr_unlock_bh(local->mdev);
435                 break;
436         case NL80211_IFTYPE_STATION:
437         case NL80211_IFTYPE_ADHOC:
438                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
439                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
440                 del_timer_sync(&sdata->u.sta.timer);
441                 /*
442                  * If the timer fired while we waited for it, it will have
443                  * requeued the work. Now the work will be running again
444                  * but will not rearm the timer again because it checks
445                  * whether the interface is running, which, at this point,
446                  * it no longer is.
447                  */
448                 cancel_work_sync(&sdata->u.sta.work);
449                 /*
450                  * When we get here, the interface is marked down.
451                  * Call synchronize_rcu() to wait for the RX path
452                  * should it be using the interface and enqueuing
453                  * frames at this very time on another CPU.
454                  */
455                 synchronize_rcu();
456                 skb_queue_purge(&sdata->u.sta.skb_queue);
457
458                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
459                 kfree(sdata->u.sta.extra_ie);
460                 sdata->u.sta.extra_ie = NULL;
461                 sdata->u.sta.extra_ie_len = 0;
462                 /* fall through */
463         case NL80211_IFTYPE_MESH_POINT:
464                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
465                         /* other_bss and allmulti are always set on mesh
466                          * ifaces */
467                         local->fif_other_bss--;
468                         atomic_dec(&local->iff_allmultis);
469
470                         netif_addr_lock_bh(local->mdev);
471                         ieee80211_configure_filter(local);
472                         netif_addr_unlock_bh(local->mdev);
473
474                         ieee80211_stop_mesh(sdata);
475                 }
476                 /* fall through */
477         default:
478                 if (local->scan_sdata == sdata) {
479                         if (!local->ops->hw_scan)
480                                 cancel_delayed_work_sync(&local->scan_work);
481                         /*
482                          * The software scan can no longer run now, so we can
483                          * clear out the scan_sdata reference. However, the
484                          * hardware scan may still be running. The complete
485                          * function must be prepared to handle a NULL value.
486                          */
487                         local->scan_sdata = NULL;
488                         /*
489                          * The memory barrier guarantees that another CPU
490                          * that is hardware-scanning will now see the fact
491                          * that this interface is gone.
492                          */
493                         smp_mb();
494                         /*
495                          * If software scanning, complete the scan but since
496                          * the scan_sdata is NULL already don't send out a
497                          * scan event to userspace -- the scan is incomplete.
498                          */
499                         if (local->sw_scanning)
500                                 ieee80211_scan_completed(&local->hw);
501                 }
502
503                 conf.vif = &sdata->vif;
504                 conf.type = sdata->vif.type;
505                 conf.mac_addr = dev->dev_addr;
506                 /* disable all keys for as long as this netdev is down */
507                 ieee80211_disable_keys(sdata);
508                 local->ops->remove_interface(local_to_hw(local), &conf);
509         }
510
511         sdata->bss = NULL;
512
513         if (local->open_count == 0) {
514                 if (netif_running(local->mdev))
515                         dev_close(local->mdev);
516
517                 if (local->ops->stop)
518                         local->ops->stop(local_to_hw(local));
519
520                 ieee80211_led_radio(local, 0);
521
522                 flush_workqueue(local->hw.workqueue);
523
524                 tasklet_disable(&local->tx_pending_tasklet);
525                 tasklet_disable(&local->tasklet);
526
527                 /* no reconfiguring after stop! */
528                 hw_reconf_flags = 0;
529         }
530
531         /* do after stop to avoid reconfiguring when we stop anyway */
532         if (hw_reconf_flags)
533                 ieee80211_hw_config(local, hw_reconf_flags);
534
535         return 0;
536 }
537
538 static void ieee80211_set_multicast_list(struct net_device *dev)
539 {
540         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
541         struct ieee80211_local *local = sdata->local;
542         int allmulti, promisc, sdata_allmulti, sdata_promisc;
543
544         allmulti = !!(dev->flags & IFF_ALLMULTI);
545         promisc = !!(dev->flags & IFF_PROMISC);
546         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
547         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
548
549         if (allmulti != sdata_allmulti) {
550                 if (dev->flags & IFF_ALLMULTI)
551                         atomic_inc(&local->iff_allmultis);
552                 else
553                         atomic_dec(&local->iff_allmultis);
554                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
555         }
556
557         if (promisc != sdata_promisc) {
558                 if (dev->flags & IFF_PROMISC)
559                         atomic_inc(&local->iff_promiscs);
560                 else
561                         atomic_dec(&local->iff_promiscs);
562                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
563         }
564
565         dev_mc_sync(local->mdev, dev);
566 }
567
568 static void ieee80211_if_setup(struct net_device *dev)
569 {
570         ether_setup(dev);
571         dev->hard_start_xmit = ieee80211_subif_start_xmit;
572         dev->wireless_handlers = &ieee80211_iw_handler_def;
573         dev->set_multicast_list = ieee80211_set_multicast_list;
574         dev->change_mtu = ieee80211_change_mtu;
575         dev->open = ieee80211_open;
576         dev->stop = ieee80211_stop;
577         dev->destructor = free_netdev;
578         /* we will validate the address ourselves in ->open */
579         dev->validate_addr = NULL;
580 }
581 /*
582  * Called when the netdev is removed or, by the code below, before
583  * the interface type changes.
584  */
585 static void ieee80211_teardown_sdata(struct net_device *dev)
586 {
587         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
588         struct ieee80211_local *local = sdata->local;
589         struct beacon_data *beacon;
590         struct sk_buff *skb;
591         int flushed;
592         int i;
593
594         /* free extra data */
595         ieee80211_free_keys(sdata);
596
597         ieee80211_debugfs_remove_netdev(sdata);
598
599         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
600                 __skb_queue_purge(&sdata->fragments[i].skb_list);
601         sdata->fragment_next = 0;
602
603         switch (sdata->vif.type) {
604         case NL80211_IFTYPE_AP:
605                 beacon = sdata->u.ap.beacon;
606                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
607                 synchronize_rcu();
608                 kfree(beacon);
609
610                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
611                         local->total_ps_buffered--;
612                         dev_kfree_skb(skb);
613                 }
614
615                 break;
616         case NL80211_IFTYPE_MESH_POINT:
617                 if (ieee80211_vif_is_mesh(&sdata->vif))
618                         mesh_rmc_free(sdata);
619                 break;
620         case NL80211_IFTYPE_STATION:
621         case NL80211_IFTYPE_ADHOC:
622                 kfree(sdata->u.sta.extra_ie);
623                 kfree(sdata->u.sta.assocreq_ies);
624                 kfree(sdata->u.sta.assocresp_ies);
625                 kfree_skb(sdata->u.sta.probe_resp);
626                 break;
627         case NL80211_IFTYPE_WDS:
628         case NL80211_IFTYPE_AP_VLAN:
629         case NL80211_IFTYPE_MONITOR:
630                 break;
631         case NL80211_IFTYPE_UNSPECIFIED:
632         case __NL80211_IFTYPE_AFTER_LAST:
633                 BUG();
634                 break;
635         }
636
637         flushed = sta_info_flush(local, sdata);
638         WARN_ON(flushed);
639 }
640
641 /*
642  * Helper function to initialise an interface to a specific type.
643  */
644 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
645                                   enum nl80211_iftype type)
646 {
647         /* clear type-dependent union */
648         memset(&sdata->u, 0, sizeof(sdata->u));
649
650         /* and set some type-dependent values */
651         sdata->vif.type = type;
652         sdata->dev->hard_start_xmit = ieee80211_subif_start_xmit;
653         sdata->wdev.iftype = type;
654
655         /* only monitor differs */
656         sdata->dev->type = ARPHRD_ETHER;
657
658         switch (type) {
659         case NL80211_IFTYPE_AP:
660                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
661                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
662                 break;
663         case NL80211_IFTYPE_STATION:
664         case NL80211_IFTYPE_ADHOC:
665                 ieee80211_sta_setup_sdata(sdata);
666                 break;
667         case NL80211_IFTYPE_MESH_POINT:
668                 if (ieee80211_vif_is_mesh(&sdata->vif))
669                         ieee80211_mesh_init_sdata(sdata);
670                 break;
671         case NL80211_IFTYPE_MONITOR:
672                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
673                 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
674                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
675                                       MONITOR_FLAG_OTHER_BSS;
676                 break;
677         case NL80211_IFTYPE_WDS:
678         case NL80211_IFTYPE_AP_VLAN:
679                 break;
680         case NL80211_IFTYPE_UNSPECIFIED:
681         case __NL80211_IFTYPE_AFTER_LAST:
682                 BUG();
683                 break;
684         }
685
686         ieee80211_debugfs_add_netdev(sdata);
687 }
688
689 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
690                              enum nl80211_iftype type)
691 {
692         ASSERT_RTNL();
693
694         if (type == sdata->vif.type)
695                 return 0;
696
697         /*
698          * We could, here, on changes between IBSS/STA/MESH modes,
699          * invoke an MLME function instead that disassociates etc.
700          * and goes into the requested mode.
701          */
702
703         if (netif_running(sdata->dev))
704                 return -EBUSY;
705
706         /* Purge and reset type-dependent state. */
707         ieee80211_teardown_sdata(sdata->dev);
708         ieee80211_setup_sdata(sdata, type);
709
710         /* reset some values that shouldn't be kept across type changes */
711         sdata->vif.bss_conf.basic_rates =
712                 ieee80211_mandatory_rates(sdata->local,
713                         sdata->local->hw.conf.channel->band);
714         sdata->drop_unencrypted = 0;
715
716         return 0;
717 }
718
719 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
720                      struct net_device **new_dev, enum nl80211_iftype type,
721                      struct vif_params *params)
722 {
723         struct net_device *ndev;
724         struct ieee80211_sub_if_data *sdata = NULL;
725         int ret, i;
726
727         ASSERT_RTNL();
728
729         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
730                             name, ieee80211_if_setup);
731         if (!ndev)
732                 return -ENOMEM;
733
734         ndev->needed_headroom = local->tx_headroom +
735                                 4*6 /* four MAC addresses */
736                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
737                                 + 6 /* mesh */
738                                 + 8 /* rfc1042/bridge tunnel */
739                                 - ETH_HLEN /* ethernet hard_header_len */
740                                 + IEEE80211_ENCRYPT_HEADROOM;
741         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
742
743         ret = dev_alloc_name(ndev, ndev->name);
744         if (ret < 0)
745                 goto fail;
746
747         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
748         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
749
750         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
751         sdata = netdev_priv(ndev);
752         ndev->ieee80211_ptr = &sdata->wdev;
753
754         /* initialise type-independent data */
755         sdata->wdev.wiphy = local->hw.wiphy;
756         sdata->local = local;
757         sdata->dev = ndev;
758
759         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
760                 skb_queue_head_init(&sdata->fragments[i].skb_list);
761
762         INIT_LIST_HEAD(&sdata->key_list);
763
764         sdata->force_unicast_rateidx = -1;
765         sdata->max_ratectrl_rateidx = -1;
766
767         /* setup type-dependent data */
768         ieee80211_setup_sdata(sdata, type);
769
770         ret = register_netdevice(ndev);
771         if (ret)
772                 goto fail;
773
774         ndev->uninit = ieee80211_teardown_sdata;
775
776         if (ieee80211_vif_is_mesh(&sdata->vif) &&
777             params && params->mesh_id_len)
778                 ieee80211_sdata_set_mesh_id(sdata,
779                                             params->mesh_id_len,
780                                             params->mesh_id);
781
782         list_add_tail_rcu(&sdata->list, &local->interfaces);
783
784         if (new_dev)
785                 *new_dev = ndev;
786
787         return 0;
788
789  fail:
790         free_netdev(ndev);
791         return ret;
792 }
793
794 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
795 {
796         ASSERT_RTNL();
797
798         list_del_rcu(&sdata->list);
799         synchronize_rcu();
800         unregister_netdevice(sdata->dev);
801 }
802
803 /*
804  * Remove all interfaces, may only be called at hardware unregistration
805  * time because it doesn't do RCU-safe list removals.
806  */
807 void ieee80211_remove_interfaces(struct ieee80211_local *local)
808 {
809         struct ieee80211_sub_if_data *sdata, *tmp;
810
811         ASSERT_RTNL();
812
813         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
814                 list_del(&sdata->list);
815                 unregister_netdevice(sdata->dev);
816         }
817 }