mac80211: convert to cfg80211 IBSS API
[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
24 /**
25  * DOC: Interface list locking
26  *
27  * The interface list in each struct ieee80211_local is protected
28  * three-fold:
29  *
30  * (1) modifications may only be done under the RTNL
31  * (2) modifications and readers are protected against each other by
32  *     the iflist_mtx.
33  * (3) modifications are done in an RCU manner so atomic readers
34  *     can traverse the list in RCU-safe blocks.
35  *
36  * As a consequence, reads (traversals) of the list can be protected
37  * by either the RTNL, the iflist_mtx or RCU.
38  */
39
40
41 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
42 {
43         int meshhdrlen;
44         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
45
46         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
47
48         /* FIX: what would be proper limits for MTU?
49          * This interface uses 802.3 frames. */
50         if (new_mtu < 256 ||
51             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
52                 return -EINVAL;
53         }
54
55 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
56         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
57 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
58         dev->mtu = new_mtu;
59         return 0;
60 }
61
62 static inline int identical_mac_addr_allowed(int type1, int type2)
63 {
64         return type1 == NL80211_IFTYPE_MONITOR ||
65                 type2 == NL80211_IFTYPE_MONITOR ||
66                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
67                 (type1 == NL80211_IFTYPE_WDS &&
68                         (type2 == NL80211_IFTYPE_WDS ||
69                          type2 == NL80211_IFTYPE_AP)) ||
70                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
71                 (type1 == NL80211_IFTYPE_AP_VLAN &&
72                         (type2 == NL80211_IFTYPE_AP ||
73                          type2 == NL80211_IFTYPE_AP_VLAN));
74 }
75
76 static int ieee80211_open(struct net_device *dev)
77 {
78         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
79         struct ieee80211_sub_if_data *nsdata;
80         struct ieee80211_local *local = sdata->local;
81         struct sta_info *sta;
82         struct ieee80211_if_init_conf conf;
83         u32 changed = 0;
84         int res;
85         u32 hw_reconf_flags = 0;
86         u8 null_addr[ETH_ALEN] = {0};
87
88         /* fail early if user set an invalid address */
89         if (compare_ether_addr(dev->dev_addr, null_addr) &&
90             !is_valid_ether_addr(dev->dev_addr))
91                 return -EADDRNOTAVAIL;
92
93         /* we hold the RTNL here so can safely walk the list */
94         list_for_each_entry(nsdata, &local->interfaces, list) {
95                 struct net_device *ndev = nsdata->dev;
96
97                 if (ndev != dev && netif_running(ndev)) {
98                         /*
99                          * Allow only a single IBSS interface to be up at any
100                          * time. This is restricted because beacon distribution
101                          * cannot work properly if both are in the same IBSS.
102                          *
103                          * To remove this restriction we'd have to disallow them
104                          * from setting the same SSID on different IBSS interfaces
105                          * belonging to the same hardware. Then, however, we're
106                          * faced with having to adopt two different TSF timers...
107                          */
108                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
109                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
110                                 return -EBUSY;
111
112                         /*
113                          * The remaining checks are only performed for interfaces
114                          * with the same MAC address.
115                          */
116                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
117                                 continue;
118
119                         /*
120                          * check whether it may have the same address
121                          */
122                         if (!identical_mac_addr_allowed(sdata->vif.type,
123                                                         nsdata->vif.type))
124                                 return -ENOTUNIQ;
125
126                         /*
127                          * can only add VLANs to enabled APs
128                          */
129                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
130                             nsdata->vif.type == NL80211_IFTYPE_AP)
131                                 sdata->bss = &nsdata->u.ap;
132                 }
133         }
134
135         switch (sdata->vif.type) {
136         case NL80211_IFTYPE_WDS:
137                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
138                         return -ENOLINK;
139                 break;
140         case NL80211_IFTYPE_AP_VLAN:
141                 if (!sdata->bss)
142                         return -ENOLINK;
143                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
144                 break;
145         case NL80211_IFTYPE_AP:
146                 sdata->bss = &sdata->u.ap;
147                 break;
148         case NL80211_IFTYPE_MESH_POINT:
149                 if (!ieee80211_vif_is_mesh(&sdata->vif))
150                         break;
151                 /* mesh ifaces must set allmulti to forward mcast traffic */
152                 atomic_inc(&local->iff_allmultis);
153                 break;
154         case NL80211_IFTYPE_STATION:
155         case NL80211_IFTYPE_MONITOR:
156         case NL80211_IFTYPE_ADHOC:
157                 /* no special treatment */
158                 break;
159         case NL80211_IFTYPE_UNSPECIFIED:
160         case __NL80211_IFTYPE_AFTER_LAST:
161                 /* cannot happen */
162                 WARN_ON(1);
163                 break;
164         }
165
166         if (local->open_count == 0) {
167                 res = 0;
168                 if (local->ops->start)
169                         res = local->ops->start(local_to_hw(local));
170                 if (res)
171                         goto err_del_bss;
172                 /* we're brought up, everything changes */
173                 hw_reconf_flags = ~0;
174                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
175         }
176
177         /*
178          * Check all interfaces and copy the hopefully now-present
179          * MAC address to those that have the special null one.
180          */
181         list_for_each_entry(nsdata, &local->interfaces, list) {
182                 struct net_device *ndev = nsdata->dev;
183
184                 /*
185                  * No need to check netif_running since we do not allow
186                  * it to start up with this invalid address.
187                  */
188                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
189                         memcpy(ndev->dev_addr,
190                                local->hw.wiphy->perm_addr,
191                                ETH_ALEN);
192         }
193
194         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
195                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
196                        ETH_ALEN);
197
198         /*
199          * Validate the MAC address for this device.
200          */
201         if (!is_valid_ether_addr(dev->dev_addr)) {
202                 if (!local->open_count && local->ops->stop)
203                         local->ops->stop(local_to_hw(local));
204                 return -EADDRNOTAVAIL;
205         }
206
207         switch (sdata->vif.type) {
208         case NL80211_IFTYPE_AP_VLAN:
209                 /* no need to tell driver */
210                 break;
211         case NL80211_IFTYPE_MONITOR:
212                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
213                         local->cooked_mntrs++;
214                         break;
215                 }
216
217                 /* must be before the call to ieee80211_configure_filter */
218                 local->monitors++;
219                 if (local->monitors == 1) {
220                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
221                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
222                 }
223
224                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
225                         local->fif_fcsfail++;
226                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
227                         local->fif_plcpfail++;
228                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
229                         local->fif_control++;
230                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
231                         local->fif_other_bss++;
232
233                 netif_addr_lock_bh(local->mdev);
234                 ieee80211_configure_filter(local);
235                 netif_addr_unlock_bh(local->mdev);
236                 break;
237         case NL80211_IFTYPE_STATION:
238                 sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
239                 /* fall through */
240         default:
241                 conf.vif = &sdata->vif;
242                 conf.type = sdata->vif.type;
243                 conf.mac_addr = dev->dev_addr;
244                 res = local->ops->add_interface(local_to_hw(local), &conf);
245                 if (res)
246                         goto err_stop;
247
248                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
249                         local->fif_other_bss++;
250                         netif_addr_lock_bh(local->mdev);
251                         ieee80211_configure_filter(local);
252                         netif_addr_unlock_bh(local->mdev);
253
254                         ieee80211_start_mesh(sdata);
255                 }
256                 changed |= ieee80211_reset_erp_info(sdata);
257                 ieee80211_bss_info_change_notify(sdata, changed);
258                 ieee80211_enable_keys(sdata);
259
260                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
261                         netif_carrier_off(dev);
262                 else
263                         netif_carrier_on(dev);
264         }
265
266         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
267                 /* Create STA entry for the WDS peer */
268                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
269                                      GFP_KERNEL);
270                 if (!sta) {
271                         res = -ENOMEM;
272                         goto err_del_interface;
273                 }
274
275                 /* no locking required since STA is not live yet */
276                 sta->flags |= WLAN_STA_AUTHORIZED;
277
278                 res = sta_info_insert(sta);
279                 if (res) {
280                         /* STA has been freed */
281                         goto err_del_interface;
282                 }
283         }
284
285         if (local->open_count == 0) {
286                 res = dev_open(local->mdev);
287                 WARN_ON(res);
288                 if (res)
289                         goto err_del_interface;
290                 tasklet_enable(&local->tx_pending_tasklet);
291                 tasklet_enable(&local->tasklet);
292         }
293
294         /*
295          * set_multicast_list will be invoked by the networking core
296          * which will check whether any increments here were done in
297          * error and sync them down to the hardware as filter flags.
298          */
299         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
300                 atomic_inc(&local->iff_allmultis);
301
302         if (sdata->flags & IEEE80211_SDATA_PROMISC)
303                 atomic_inc(&local->iff_promiscs);
304
305         local->open_count++;
306         if (hw_reconf_flags) {
307                 ieee80211_hw_config(local, hw_reconf_flags);
308                 /*
309                  * set default queue parameters so drivers don't
310                  * need to initialise the hardware if the hardware
311                  * doesn't start up with sane defaults
312                  */
313                 ieee80211_set_wmm_default(sdata);
314         }
315
316         ieee80211_recalc_ps(local, -1);
317
318         /*
319          * ieee80211_sta_work is disabled while network interface
320          * is down. Therefore, some configuration changes may not
321          * yet be effective. Trigger execution of ieee80211_sta_work
322          * to fix this.
323          */
324         if (sdata->vif.type == NL80211_IFTYPE_STATION)
325                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
326
327         netif_tx_start_all_queues(dev);
328
329         return 0;
330  err_del_interface:
331         local->ops->remove_interface(local_to_hw(local), &conf);
332  err_stop:
333         if (!local->open_count && local->ops->stop)
334                 local->ops->stop(local_to_hw(local));
335  err_del_bss:
336         sdata->bss = NULL;
337         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
338                 list_del(&sdata->u.vlan.list);
339         return res;
340 }
341
342 static int ieee80211_stop(struct net_device *dev)
343 {
344         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
345         struct ieee80211_local *local = sdata->local;
346         struct ieee80211_if_init_conf conf;
347         struct sta_info *sta;
348         u32 hw_reconf_flags = 0;
349
350         /*
351          * Stop TX on this interface first.
352          */
353         netif_tx_stop_all_queues(dev);
354
355         /*
356          * Now delete all active aggregation sessions.
357          */
358         rcu_read_lock();
359
360         list_for_each_entry_rcu(sta, &local->sta_list, list) {
361                 if (sta->sdata == sdata)
362                         ieee80211_sta_tear_down_BA_sessions(sta);
363         }
364
365         rcu_read_unlock();
366
367         /*
368          * Announce that we are leaving the network, in case we are a
369          * station interface type. This must be done before removing
370          * all stations associated with sta_info_flush, otherwise STA
371          * information will be gone and no announce being done.
372          */
373         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
374                 if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED)
375                         ieee80211_sta_deauthenticate(sdata,
376                                 WLAN_REASON_DEAUTH_LEAVING);
377         }
378
379         /*
380          * Remove all stations associated with this interface.
381          *
382          * This must be done before calling ops->remove_interface()
383          * because otherwise we can later invoke ops->sta_notify()
384          * whenever the STAs are removed, and that invalidates driver
385          * assumptions about always getting a vif pointer that is valid
386          * (because if we remove a STA after ops->remove_interface()
387          * the driver will have removed the vif info already!)
388          *
389          * We could relax this and only unlink the stations from the
390          * hash table and list but keep them on a per-sdata list that
391          * will be inserted back again when the interface is brought
392          * up again, but I don't currently see a use case for that,
393          * except with WDS which gets a STA entry created when it is
394          * brought up.
395          */
396         sta_info_flush(local, sdata);
397
398         /*
399          * Don't count this interface for promisc/allmulti while it
400          * is down. dev_mc_unsync() will invoke set_multicast_list
401          * on the master interface which will sync these down to the
402          * hardware as filter flags.
403          */
404         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
405                 atomic_dec(&local->iff_allmultis);
406
407         if (sdata->flags & IEEE80211_SDATA_PROMISC)
408                 atomic_dec(&local->iff_promiscs);
409
410         dev_mc_unsync(local->mdev, dev);
411         del_timer_sync(&local->dynamic_ps_timer);
412         cancel_work_sync(&local->dynamic_ps_enable_work);
413
414         /* APs need special treatment */
415         if (sdata->vif.type == NL80211_IFTYPE_AP) {
416                 struct ieee80211_sub_if_data *vlan, *tmp;
417                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
418
419                 /* remove beacon */
420                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
421                 synchronize_rcu();
422                 kfree(old_beacon);
423
424                 /* down all dependent devices, that is VLANs */
425                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
426                                          u.vlan.list)
427                         dev_close(vlan->dev);
428                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
429         }
430
431         local->open_count--;
432
433         switch (sdata->vif.type) {
434         case NL80211_IFTYPE_AP_VLAN:
435                 list_del(&sdata->u.vlan.list);
436                 /* no need to tell driver */
437                 break;
438         case NL80211_IFTYPE_MONITOR:
439                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
440                         local->cooked_mntrs--;
441                         break;
442                 }
443
444                 local->monitors--;
445                 if (local->monitors == 0) {
446                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
447                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
448                 }
449
450                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
451                         local->fif_fcsfail--;
452                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
453                         local->fif_plcpfail--;
454                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
455                         local->fif_control--;
456                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
457                         local->fif_other_bss--;
458
459                 netif_addr_lock_bh(local->mdev);
460                 ieee80211_configure_filter(local);
461                 netif_addr_unlock_bh(local->mdev);
462                 break;
463         case NL80211_IFTYPE_STATION:
464                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
465                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
466                 del_timer_sync(&sdata->u.mgd.timer);
467                 /*
468                  * If the timer fired while we waited for it, it will have
469                  * requeued the work. Now the work will be running again
470                  * but will not rearm the timer again because it checks
471                  * whether the interface is running, which, at this point,
472                  * it no longer is.
473                  */
474                 cancel_work_sync(&sdata->u.mgd.work);
475                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
476
477                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
478
479                 /*
480                  * When we get here, the interface is marked down.
481                  * Call synchronize_rcu() to wait for the RX path
482                  * should it be using the interface and enqueuing
483                  * frames at this very time on another CPU.
484                  */
485                 synchronize_rcu();
486                 skb_queue_purge(&sdata->u.mgd.skb_queue);
487
488                 sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
489                                         IEEE80211_STA_TKIP_WEP_USED);
490                 kfree(sdata->u.mgd.extra_ie);
491                 sdata->u.mgd.extra_ie = NULL;
492                 sdata->u.mgd.extra_ie_len = 0;
493                 /* fall through */
494         case NL80211_IFTYPE_ADHOC:
495                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
496                         del_timer_sync(&sdata->u.ibss.timer);
497                         cancel_work_sync(&sdata->u.ibss.work);
498                         synchronize_rcu();
499                         skb_queue_purge(&sdata->u.ibss.skb_queue);
500                 }
501                 /* fall through */
502         case NL80211_IFTYPE_MESH_POINT:
503                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
504                         /* other_bss and allmulti are always set on mesh
505                          * ifaces */
506                         local->fif_other_bss--;
507                         atomic_dec(&local->iff_allmultis);
508
509                         netif_addr_lock_bh(local->mdev);
510                         ieee80211_configure_filter(local);
511                         netif_addr_unlock_bh(local->mdev);
512
513                         ieee80211_stop_mesh(sdata);
514                 }
515                 /* fall through */
516         default:
517                 if (local->scan_sdata == sdata) {
518                         if (!local->ops->hw_scan)
519                                 cancel_delayed_work_sync(&local->scan_work);
520                         /*
521                          * The software scan can no longer run now, so we can
522                          * clear out the scan_sdata reference. However, the
523                          * hardware scan may still be running. The complete
524                          * function must be prepared to handle a NULL value.
525                          */
526                         local->scan_sdata = NULL;
527                         /*
528                          * The memory barrier guarantees that another CPU
529                          * that is hardware-scanning will now see the fact
530                          * that this interface is gone.
531                          */
532                         smp_mb();
533                         /*
534                          * If software scanning, complete the scan but since
535                          * the scan_sdata is NULL already don't send out a
536                          * scan event to userspace -- the scan is incomplete.
537                          */
538                         if (local->sw_scanning)
539                                 ieee80211_scan_completed(&local->hw, true);
540                 }
541
542                 conf.vif = &sdata->vif;
543                 conf.type = sdata->vif.type;
544                 conf.mac_addr = dev->dev_addr;
545                 /* disable all keys for as long as this netdev is down */
546                 ieee80211_disable_keys(sdata);
547                 local->ops->remove_interface(local_to_hw(local), &conf);
548         }
549
550         sdata->bss = NULL;
551
552         if (local->open_count == 0) {
553                 if (netif_running(local->mdev))
554                         dev_close(local->mdev);
555
556                 if (local->ops->stop)
557                         local->ops->stop(local_to_hw(local));
558
559                 ieee80211_led_radio(local, 0);
560
561                 flush_workqueue(local->hw.workqueue);
562
563                 tasklet_disable(&local->tx_pending_tasklet);
564                 tasklet_disable(&local->tasklet);
565
566                 /* no reconfiguring after stop! */
567                 hw_reconf_flags = 0;
568         }
569
570         ieee80211_recalc_ps(local, -1);
571
572         /* do after stop to avoid reconfiguring when we stop anyway */
573         if (hw_reconf_flags)
574                 ieee80211_hw_config(local, hw_reconf_flags);
575
576         return 0;
577 }
578
579 static void ieee80211_set_multicast_list(struct net_device *dev)
580 {
581         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
582         struct ieee80211_local *local = sdata->local;
583         int allmulti, promisc, sdata_allmulti, sdata_promisc;
584
585         allmulti = !!(dev->flags & IFF_ALLMULTI);
586         promisc = !!(dev->flags & IFF_PROMISC);
587         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
588         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
589
590         if (allmulti != sdata_allmulti) {
591                 if (dev->flags & IFF_ALLMULTI)
592                         atomic_inc(&local->iff_allmultis);
593                 else
594                         atomic_dec(&local->iff_allmultis);
595                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
596         }
597
598         if (promisc != sdata_promisc) {
599                 if (dev->flags & IFF_PROMISC)
600                         atomic_inc(&local->iff_promiscs);
601                 else
602                         atomic_dec(&local->iff_promiscs);
603                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
604         }
605
606         dev_mc_sync(local->mdev, dev);
607 }
608
609 /*
610  * Called when the netdev is removed or, by the code below, before
611  * the interface type changes.
612  */
613 static void ieee80211_teardown_sdata(struct net_device *dev)
614 {
615         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
616         struct ieee80211_local *local = sdata->local;
617         struct beacon_data *beacon;
618         struct sk_buff *skb;
619         int flushed;
620         int i;
621
622         /* free extra data */
623         ieee80211_free_keys(sdata);
624
625         ieee80211_debugfs_remove_netdev(sdata);
626
627         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
628                 __skb_queue_purge(&sdata->fragments[i].skb_list);
629         sdata->fragment_next = 0;
630
631         switch (sdata->vif.type) {
632         case NL80211_IFTYPE_AP:
633                 beacon = sdata->u.ap.beacon;
634                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
635                 synchronize_rcu();
636                 kfree(beacon);
637
638                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
639                         local->total_ps_buffered--;
640                         dev_kfree_skb(skb);
641                 }
642
643                 break;
644         case NL80211_IFTYPE_MESH_POINT:
645                 if (ieee80211_vif_is_mesh(&sdata->vif))
646                         mesh_rmc_free(sdata);
647                 break;
648         case NL80211_IFTYPE_ADHOC:
649                 if (WARN_ON(sdata->u.ibss.presp))
650                         kfree_skb(sdata->u.ibss.presp);
651                 break;
652         case NL80211_IFTYPE_STATION:
653                 kfree(sdata->u.mgd.extra_ie);
654                 kfree(sdata->u.mgd.assocreq_ies);
655                 kfree(sdata->u.mgd.assocresp_ies);
656                 kfree(sdata->u.mgd.sme_auth_ie);
657                 break;
658         case NL80211_IFTYPE_WDS:
659         case NL80211_IFTYPE_AP_VLAN:
660         case NL80211_IFTYPE_MONITOR:
661                 break;
662         case NL80211_IFTYPE_UNSPECIFIED:
663         case __NL80211_IFTYPE_AFTER_LAST:
664                 BUG();
665                 break;
666         }
667
668         flushed = sta_info_flush(local, sdata);
669         WARN_ON(flushed);
670 }
671
672 static const struct net_device_ops ieee80211_dataif_ops = {
673         .ndo_open               = ieee80211_open,
674         .ndo_stop               = ieee80211_stop,
675         .ndo_uninit             = ieee80211_teardown_sdata,
676         .ndo_start_xmit         = ieee80211_subif_start_xmit,
677         .ndo_set_multicast_list = ieee80211_set_multicast_list,
678         .ndo_change_mtu         = ieee80211_change_mtu,
679         .ndo_set_mac_address    = eth_mac_addr,
680 };
681
682 static const struct net_device_ops ieee80211_monitorif_ops = {
683         .ndo_open               = ieee80211_open,
684         .ndo_stop               = ieee80211_stop,
685         .ndo_uninit             = ieee80211_teardown_sdata,
686         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
687         .ndo_set_multicast_list = ieee80211_set_multicast_list,
688         .ndo_change_mtu         = ieee80211_change_mtu,
689         .ndo_set_mac_address    = eth_mac_addr,
690 };
691
692 static void ieee80211_if_setup(struct net_device *dev)
693 {
694         ether_setup(dev);
695         dev->netdev_ops = &ieee80211_dataif_ops;
696         dev->wireless_handlers = &ieee80211_iw_handler_def;
697         dev->destructor = free_netdev;
698 }
699
700 /*
701  * Helper function to initialise an interface to a specific type.
702  */
703 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
704                                   enum nl80211_iftype type)
705 {
706         /* clear type-dependent union */
707         memset(&sdata->u, 0, sizeof(sdata->u));
708
709         /* and set some type-dependent values */
710         sdata->vif.type = type;
711         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
712         sdata->wdev.iftype = type;
713
714         /* only monitor differs */
715         sdata->dev->type = ARPHRD_ETHER;
716
717         switch (type) {
718         case NL80211_IFTYPE_AP:
719                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
720                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
721                 break;
722         case NL80211_IFTYPE_STATION:
723                 ieee80211_sta_setup_sdata(sdata);
724                 break;
725         case NL80211_IFTYPE_ADHOC:
726                 ieee80211_ibss_setup_sdata(sdata);
727                 break;
728         case NL80211_IFTYPE_MESH_POINT:
729                 if (ieee80211_vif_is_mesh(&sdata->vif))
730                         ieee80211_mesh_init_sdata(sdata);
731                 break;
732         case NL80211_IFTYPE_MONITOR:
733                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
734                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
735                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
736                                       MONITOR_FLAG_OTHER_BSS;
737                 break;
738         case NL80211_IFTYPE_WDS:
739         case NL80211_IFTYPE_AP_VLAN:
740                 break;
741         case NL80211_IFTYPE_UNSPECIFIED:
742         case __NL80211_IFTYPE_AFTER_LAST:
743                 BUG();
744                 break;
745         }
746
747         ieee80211_debugfs_add_netdev(sdata);
748 }
749
750 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
751                              enum nl80211_iftype type)
752 {
753         ASSERT_RTNL();
754
755         if (type == sdata->vif.type)
756                 return 0;
757
758         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
759         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
760             type == NL80211_IFTYPE_ADHOC)
761                 return -EOPNOTSUPP;
762
763         /*
764          * We could, here, on changes between IBSS/STA/MESH modes,
765          * invoke an MLME function instead that disassociates etc.
766          * and goes into the requested mode.
767          */
768
769         if (netif_running(sdata->dev))
770                 return -EBUSY;
771
772         /* Purge and reset type-dependent state. */
773         ieee80211_teardown_sdata(sdata->dev);
774         ieee80211_setup_sdata(sdata, type);
775
776         /* reset some values that shouldn't be kept across type changes */
777         sdata->vif.bss_conf.basic_rates =
778                 ieee80211_mandatory_rates(sdata->local,
779                         sdata->local->hw.conf.channel->band);
780         sdata->drop_unencrypted = 0;
781
782         return 0;
783 }
784
785 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
786                      struct net_device **new_dev, enum nl80211_iftype type,
787                      struct vif_params *params)
788 {
789         struct net_device *ndev;
790         struct ieee80211_sub_if_data *sdata = NULL;
791         int ret, i;
792
793         ASSERT_RTNL();
794
795         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
796                             name, ieee80211_if_setup);
797         if (!ndev)
798                 return -ENOMEM;
799
800         ndev->needed_headroom = local->tx_headroom +
801                                 4*6 /* four MAC addresses */
802                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
803                                 + 6 /* mesh */
804                                 + 8 /* rfc1042/bridge tunnel */
805                                 - ETH_HLEN /* ethernet hard_header_len */
806                                 + IEEE80211_ENCRYPT_HEADROOM;
807         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
808
809         ret = dev_alloc_name(ndev, ndev->name);
810         if (ret < 0)
811                 goto fail;
812
813         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
814         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
815         ndev->features |= NETIF_F_NETNS_LOCAL;
816
817         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
818         sdata = netdev_priv(ndev);
819         ndev->ieee80211_ptr = &sdata->wdev;
820
821         /* initialise type-independent data */
822         sdata->wdev.wiphy = local->hw.wiphy;
823         sdata->local = local;
824         sdata->dev = ndev;
825
826         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
827                 skb_queue_head_init(&sdata->fragments[i].skb_list);
828
829         INIT_LIST_HEAD(&sdata->key_list);
830
831         sdata->force_unicast_rateidx = -1;
832         sdata->max_ratectrl_rateidx = -1;
833
834         /* setup type-dependent data */
835         ieee80211_setup_sdata(sdata, type);
836
837         ret = register_netdevice(ndev);
838         if (ret)
839                 goto fail;
840
841         if (ieee80211_vif_is_mesh(&sdata->vif) &&
842             params && params->mesh_id_len)
843                 ieee80211_sdata_set_mesh_id(sdata,
844                                             params->mesh_id_len,
845                                             params->mesh_id);
846
847         mutex_lock(&local->iflist_mtx);
848         list_add_tail_rcu(&sdata->list, &local->interfaces);
849         mutex_unlock(&local->iflist_mtx);
850
851         if (new_dev)
852                 *new_dev = ndev;
853
854         return 0;
855
856  fail:
857         free_netdev(ndev);
858         return ret;
859 }
860
861 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
862 {
863         ASSERT_RTNL();
864
865         mutex_lock(&sdata->local->iflist_mtx);
866         list_del_rcu(&sdata->list);
867         mutex_unlock(&sdata->local->iflist_mtx);
868
869         synchronize_rcu();
870         unregister_netdevice(sdata->dev);
871 }
872
873 /*
874  * Remove all interfaces, may only be called at hardware unregistration
875  * time because it doesn't do RCU-safe list removals.
876  */
877 void ieee80211_remove_interfaces(struct ieee80211_local *local)
878 {
879         struct ieee80211_sub_if_data *sdata, *tmp;
880
881         ASSERT_RTNL();
882
883         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
884                 /*
885                  * we cannot hold the iflist_mtx across unregister_netdevice,
886                  * but we only need to hold it for list modifications to lock
887                  * out readers since we're under the RTNL here as all other
888                  * writers.
889                  */
890                 mutex_lock(&local->iflist_mtx);
891                 list_del(&sdata->list);
892                 mutex_unlock(&local->iflist_mtx);
893
894                 unregister_netdevice(sdata->dev);
895         }
896 }