edf21cebeee8984b5b5f1852520fea2065a51e21
[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 <net/ieee80211_radiotap.h>
19 #include "ieee80211_i.h"
20 #include "sta_info.h"
21 #include "debugfs_netdev.h"
22 #include "mesh.h"
23 #include "led.h"
24 #include "driver-ops.h"
25 #include "wme.h"
26
27 /**
28  * DOC: Interface list locking
29  *
30  * The interface list in each struct ieee80211_local is protected
31  * three-fold:
32  *
33  * (1) modifications may only be done under the RTNL
34  * (2) modifications and readers are protected against each other by
35  *     the iflist_mtx.
36  * (3) modifications are done in an RCU manner so atomic readers
37  *     can traverse the list in RCU-safe blocks.
38  *
39  * As a consequence, reads (traversals) of the list can be protected
40  * by either the RTNL, the iflist_mtx or RCU.
41  */
42
43
44 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
45 {
46         int meshhdrlen;
47         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
48
49         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
50
51         /* FIX: what would be proper limits for MTU?
52          * This interface uses 802.3 frames. */
53         if (new_mtu < 256 ||
54             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
55                 return -EINVAL;
56         }
57
58 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
59         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
60 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
61         dev->mtu = new_mtu;
62         return 0;
63 }
64
65 static int ieee80211_change_mac(struct net_device *dev, void *addr)
66 {
67         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
68         struct sockaddr *sa = addr;
69         int ret;
70
71         if (ieee80211_sdata_running(sdata))
72                 return -EBUSY;
73
74         ret = eth_mac_addr(dev, sa);
75
76         if (ret == 0)
77                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
78
79         return ret;
80 }
81
82 static inline int identical_mac_addr_allowed(int type1, int type2)
83 {
84         return type1 == NL80211_IFTYPE_MONITOR ||
85                 type2 == NL80211_IFTYPE_MONITOR ||
86                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
87                 (type1 == NL80211_IFTYPE_WDS &&
88                         (type2 == NL80211_IFTYPE_WDS ||
89                          type2 == NL80211_IFTYPE_AP)) ||
90                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
91                 (type1 == NL80211_IFTYPE_AP_VLAN &&
92                         (type2 == NL80211_IFTYPE_AP ||
93                          type2 == NL80211_IFTYPE_AP_VLAN));
94 }
95
96 static int ieee80211_open(struct net_device *dev)
97 {
98         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
99         struct ieee80211_sub_if_data *nsdata;
100         struct ieee80211_local *local = sdata->local;
101         struct sta_info *sta;
102         u32 changed = 0;
103         int res;
104         u32 hw_reconf_flags = 0;
105         u8 null_addr[ETH_ALEN] = {0};
106
107         /* fail early if user set an invalid address */
108         if (compare_ether_addr(dev->dev_addr, null_addr) &&
109             !is_valid_ether_addr(dev->dev_addr))
110                 return -EADDRNOTAVAIL;
111
112         /* we hold the RTNL here so can safely walk the list */
113         list_for_each_entry(nsdata, &local->interfaces, list) {
114                 struct net_device *ndev = nsdata->dev;
115
116                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
117                         /*
118                          * Allow only a single IBSS interface to be up at any
119                          * time. This is restricted because beacon distribution
120                          * cannot work properly if both are in the same IBSS.
121                          *
122                          * To remove this restriction we'd have to disallow them
123                          * from setting the same SSID on different IBSS interfaces
124                          * belonging to the same hardware. Then, however, we're
125                          * faced with having to adopt two different TSF timers...
126                          */
127                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
128                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
129                                 return -EBUSY;
130
131                         /*
132                          * The remaining checks are only performed for interfaces
133                          * with the same MAC address.
134                          */
135                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
136                                 continue;
137
138                         /*
139                          * check whether it may have the same address
140                          */
141                         if (!identical_mac_addr_allowed(sdata->vif.type,
142                                                         nsdata->vif.type))
143                                 return -ENOTUNIQ;
144
145                         /*
146                          * can only add VLANs to enabled APs
147                          */
148                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
149                             nsdata->vif.type == NL80211_IFTYPE_AP)
150                                 sdata->bss = &nsdata->u.ap;
151                 }
152         }
153
154         switch (sdata->vif.type) {
155         case NL80211_IFTYPE_WDS:
156                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
157                         return -ENOLINK;
158                 break;
159         case NL80211_IFTYPE_AP_VLAN:
160                 if (!sdata->bss)
161                         return -ENOLINK;
162                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
163                 break;
164         case NL80211_IFTYPE_AP:
165                 sdata->bss = &sdata->u.ap;
166                 break;
167         case NL80211_IFTYPE_MESH_POINT:
168                 if (!ieee80211_vif_is_mesh(&sdata->vif))
169                         break;
170                 /* mesh ifaces must set allmulti to forward mcast traffic */
171                 atomic_inc(&local->iff_allmultis);
172                 break;
173         case NL80211_IFTYPE_STATION:
174         case NL80211_IFTYPE_MONITOR:
175         case NL80211_IFTYPE_ADHOC:
176                 /* no special treatment */
177                 break;
178         case NL80211_IFTYPE_UNSPECIFIED:
179         case __NL80211_IFTYPE_AFTER_LAST:
180                 /* cannot happen */
181                 WARN_ON(1);
182                 break;
183         }
184
185         if (local->open_count == 0) {
186                 res = drv_start(local);
187                 if (res)
188                         goto err_del_bss;
189                 /* we're brought up, everything changes */
190                 hw_reconf_flags = ~0;
191                 ieee80211_led_radio(local, true);
192         }
193
194         /*
195          * Check all interfaces and copy the hopefully now-present
196          * MAC address to those that have the special null one.
197          */
198         list_for_each_entry(nsdata, &local->interfaces, list) {
199                 struct net_device *ndev = nsdata->dev;
200
201                 /*
202                  * No need to check running since we do not allow
203                  * it to start up with this invalid address.
204                  */
205                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
206                         memcpy(ndev->dev_addr,
207                                local->hw.wiphy->perm_addr,
208                                ETH_ALEN);
209                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
210                 }
211         }
212
213         /*
214          * Validate the MAC address for this device.
215          */
216         if (!is_valid_ether_addr(dev->dev_addr)) {
217                 if (!local->open_count)
218                         drv_stop(local);
219                 return -EADDRNOTAVAIL;
220         }
221
222         switch (sdata->vif.type) {
223         case NL80211_IFTYPE_AP_VLAN:
224                 /* no need to tell driver */
225                 break;
226         case NL80211_IFTYPE_MONITOR:
227                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
228                         local->cooked_mntrs++;
229                         break;
230                 }
231
232                 /* must be before the call to ieee80211_configure_filter */
233                 local->monitors++;
234                 if (local->monitors == 1) {
235                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
236                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
237                 }
238
239                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
240                         local->fif_fcsfail++;
241                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
242                         local->fif_plcpfail++;
243                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
244                         local->fif_control++;
245                         local->fif_pspoll++;
246                 }
247                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
248                         local->fif_other_bss++;
249
250                 ieee80211_configure_filter(local);
251                 break;
252         default:
253                 res = drv_add_interface(local, &sdata->vif);
254                 if (res)
255                         goto err_stop;
256
257                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
258                         local->fif_other_bss++;
259                         ieee80211_configure_filter(local);
260
261                         ieee80211_start_mesh(sdata);
262                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
263                         local->fif_pspoll++;
264
265                         ieee80211_configure_filter(local);
266                 }
267
268                 changed |= ieee80211_reset_erp_info(sdata);
269                 ieee80211_bss_info_change_notify(sdata, changed);
270                 ieee80211_enable_keys(sdata);
271
272                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
273                         netif_carrier_off(dev);
274                 else
275                         netif_carrier_on(dev);
276         }
277
278         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
279                 /* Create STA entry for the WDS peer */
280                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
281                                      GFP_KERNEL);
282                 if (!sta) {
283                         res = -ENOMEM;
284                         goto err_del_interface;
285                 }
286
287                 /* no locking required since STA is not live yet */
288                 sta->flags |= WLAN_STA_AUTHORIZED;
289
290                 res = sta_info_insert(sta);
291                 if (res) {
292                         /* STA has been freed */
293                         goto err_del_interface;
294                 }
295         }
296
297         /*
298          * set_multicast_list will be invoked by the networking core
299          * which will check whether any increments here were done in
300          * error and sync them down to the hardware as filter flags.
301          */
302         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
303                 atomic_inc(&local->iff_allmultis);
304
305         if (sdata->flags & IEEE80211_SDATA_PROMISC)
306                 atomic_inc(&local->iff_promiscs);
307
308         hw_reconf_flags |= __ieee80211_recalc_idle(local);
309
310         local->open_count++;
311         if (hw_reconf_flags) {
312                 ieee80211_hw_config(local, hw_reconf_flags);
313                 /*
314                  * set default queue parameters so drivers don't
315                  * need to initialise the hardware if the hardware
316                  * doesn't start up with sane defaults
317                  */
318                 ieee80211_set_wmm_default(sdata);
319         }
320
321         ieee80211_recalc_ps(local, -1);
322
323         /*
324          * ieee80211_sta_work is disabled while network interface
325          * is down. Therefore, some configuration changes may not
326          * yet be effective. Trigger execution of ieee80211_sta_work
327          * to fix this.
328          */
329         if (sdata->vif.type == NL80211_IFTYPE_STATION)
330                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
331
332         netif_tx_start_all_queues(dev);
333
334         return 0;
335  err_del_interface:
336         drv_remove_interface(local, &sdata->vif);
337  err_stop:
338         if (!local->open_count)
339                 drv_stop(local);
340  err_del_bss:
341         sdata->bss = NULL;
342         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
343                 list_del(&sdata->u.vlan.list);
344         return res;
345 }
346
347 static int ieee80211_stop(struct net_device *dev)
348 {
349         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
350         struct ieee80211_local *local = sdata->local;
351         struct sta_info *sta;
352         unsigned long flags;
353         struct sk_buff *skb, *tmp;
354         u32 hw_reconf_flags = 0;
355         int i;
356
357         /*
358          * Stop TX on this interface first.
359          */
360         netif_tx_stop_all_queues(dev);
361
362         /*
363          * Purge work for this interface.
364          */
365         ieee80211_work_purge(sdata);
366
367         /*
368          * Now delete all active aggregation sessions.
369          */
370         rcu_read_lock();
371
372         list_for_each_entry_rcu(sta, &local->sta_list, list) {
373                 if (sta->sdata == sdata)
374                         ieee80211_sta_tear_down_BA_sessions(sta);
375         }
376
377         rcu_read_unlock();
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         if (sdata->vif.type == NL80211_IFTYPE_AP)
411                 local->fif_pspoll--;
412
413         netif_addr_lock_bh(dev);
414         spin_lock_bh(&local->filter_lock);
415         __dev_addr_unsync(&local->mc_list, &local->mc_count,
416                           &dev->mc_list, &dev->mc_count);
417         spin_unlock_bh(&local->filter_lock);
418         netif_addr_unlock_bh(dev);
419
420         ieee80211_configure_filter(local);
421
422         del_timer_sync(&local->dynamic_ps_timer);
423         cancel_work_sync(&local->dynamic_ps_enable_work);
424
425         /* APs need special treatment */
426         if (sdata->vif.type == NL80211_IFTYPE_AP) {
427                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
428                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
429
430                 /* remove beacon */
431                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
432                 synchronize_rcu();
433                 kfree(old_beacon);
434
435                 /* down all dependent devices, that is VLANs */
436                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
437                                          u.vlan.list)
438                         dev_close(vlan->dev);
439                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
440         }
441
442         local->open_count--;
443
444         switch (sdata->vif.type) {
445         case NL80211_IFTYPE_AP_VLAN:
446                 list_del(&sdata->u.vlan.list);
447                 /* no need to tell driver */
448                 break;
449         case NL80211_IFTYPE_MONITOR:
450                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
451                         local->cooked_mntrs--;
452                         break;
453                 }
454
455                 local->monitors--;
456                 if (local->monitors == 0) {
457                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
458                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
459                 }
460
461                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
462                         local->fif_fcsfail--;
463                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
464                         local->fif_plcpfail--;
465                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
466                         local->fif_pspoll--;
467                         local->fif_control--;
468                 }
469                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
470                         local->fif_other_bss--;
471
472                 ieee80211_configure_filter(local);
473                 break;
474         case NL80211_IFTYPE_STATION:
475                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
476                 del_timer_sync(&sdata->u.mgd.timer);
477                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
478                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
479                 /*
480                  * If any of the timers fired while we waited for it, it will
481                  * have queued its work. Now the work will be running again
482                  * but will not rearm the timer again because it checks
483                  * whether the interface is running, which, at this point,
484                  * it no longer is.
485                  */
486                 cancel_work_sync(&sdata->u.mgd.work);
487                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
488                 cancel_work_sync(&sdata->u.mgd.monitor_work);
489                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
490
491                 /*
492                  * When we get here, the interface is marked down.
493                  * Call synchronize_rcu() to wait for the RX path
494                  * should it be using the interface and enqueuing
495                  * frames at this very time on another CPU.
496                  */
497                 synchronize_rcu();
498                 skb_queue_purge(&sdata->u.mgd.skb_queue);
499                 /* fall through */
500         case NL80211_IFTYPE_ADHOC:
501                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
502                         del_timer_sync(&sdata->u.ibss.timer);
503                         cancel_work_sync(&sdata->u.ibss.work);
504                         synchronize_rcu();
505                         skb_queue_purge(&sdata->u.ibss.skb_queue);
506                 }
507                 /* fall through */
508         case NL80211_IFTYPE_MESH_POINT:
509                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
510                         /* other_bss and allmulti are always set on mesh
511                          * ifaces */
512                         local->fif_other_bss--;
513                         atomic_dec(&local->iff_allmultis);
514
515                         ieee80211_configure_filter(local);
516
517                         ieee80211_stop_mesh(sdata);
518                 }
519                 /* fall through */
520         default:
521                 if (local->scan_sdata == sdata)
522                         ieee80211_scan_cancel(local);
523
524                 /*
525                  * Disable beaconing for AP and mesh, IBSS can't
526                  * still be joined to a network at this point.
527                  */
528                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
529                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
530                         ieee80211_bss_info_change_notify(sdata,
531                                 BSS_CHANGED_BEACON_ENABLED);
532                 }
533
534                 /* disable all keys for as long as this netdev is down */
535                 ieee80211_disable_keys(sdata);
536                 drv_remove_interface(local, &sdata->vif);
537         }
538
539         sdata->bss = NULL;
540
541         hw_reconf_flags |= __ieee80211_recalc_idle(local);
542
543         ieee80211_recalc_ps(local, -1);
544
545         if (local->open_count == 0) {
546                 ieee80211_clear_tx_pending(local);
547                 ieee80211_stop_device(local);
548
549                 /* no reconfiguring after stop! */
550                 hw_reconf_flags = 0;
551         }
552
553         /* do after stop to avoid reconfiguring when we stop anyway */
554         if (hw_reconf_flags)
555                 ieee80211_hw_config(local, hw_reconf_flags);
556
557         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
558         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
559                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
560                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
561                         if (info->control.vif == &sdata->vif) {
562                                 __skb_unlink(skb, &local->pending[i]);
563                                 dev_kfree_skb_irq(skb);
564                         }
565                 }
566         }
567         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
568
569         return 0;
570 }
571
572 static void ieee80211_set_multicast_list(struct net_device *dev)
573 {
574         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
575         struct ieee80211_local *local = sdata->local;
576         int allmulti, promisc, sdata_allmulti, sdata_promisc;
577
578         allmulti = !!(dev->flags & IFF_ALLMULTI);
579         promisc = !!(dev->flags & IFF_PROMISC);
580         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
581         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
582
583         if (allmulti != sdata_allmulti) {
584                 if (dev->flags & IFF_ALLMULTI)
585                         atomic_inc(&local->iff_allmultis);
586                 else
587                         atomic_dec(&local->iff_allmultis);
588                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
589         }
590
591         if (promisc != sdata_promisc) {
592                 if (dev->flags & IFF_PROMISC)
593                         atomic_inc(&local->iff_promiscs);
594                 else
595                         atomic_dec(&local->iff_promiscs);
596                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
597         }
598         spin_lock_bh(&local->filter_lock);
599         __dev_addr_sync(&local->mc_list, &local->mc_count,
600                         &dev->mc_list, &dev->mc_count);
601         spin_unlock_bh(&local->filter_lock);
602         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
603 }
604
605 /*
606  * Called when the netdev is removed or, by the code below, before
607  * the interface type changes.
608  */
609 static void ieee80211_teardown_sdata(struct net_device *dev)
610 {
611         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
612         struct ieee80211_local *local = sdata->local;
613         struct beacon_data *beacon;
614         struct sk_buff *skb;
615         int flushed;
616         int i;
617
618         /* free extra data */
619         ieee80211_free_keys(sdata);
620
621         ieee80211_debugfs_remove_netdev(sdata);
622
623         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
624                 __skb_queue_purge(&sdata->fragments[i].skb_list);
625         sdata->fragment_next = 0;
626
627         switch (sdata->vif.type) {
628         case NL80211_IFTYPE_AP:
629                 beacon = sdata->u.ap.beacon;
630                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
631                 synchronize_rcu();
632                 kfree(beacon);
633
634                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
635                         local->total_ps_buffered--;
636                         dev_kfree_skb(skb);
637                 }
638
639                 break;
640         case NL80211_IFTYPE_MESH_POINT:
641                 if (ieee80211_vif_is_mesh(&sdata->vif))
642                         mesh_rmc_free(sdata);
643                 break;
644         case NL80211_IFTYPE_ADHOC:
645                 if (WARN_ON(sdata->u.ibss.presp))
646                         kfree_skb(sdata->u.ibss.presp);
647                 break;
648         case NL80211_IFTYPE_STATION:
649         case NL80211_IFTYPE_WDS:
650         case NL80211_IFTYPE_AP_VLAN:
651         case NL80211_IFTYPE_MONITOR:
652                 break;
653         case NL80211_IFTYPE_UNSPECIFIED:
654         case __NL80211_IFTYPE_AFTER_LAST:
655                 BUG();
656                 break;
657         }
658
659         flushed = sta_info_flush(local, sdata);
660         WARN_ON(flushed);
661 }
662
663 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
664                                          struct sk_buff *skb)
665 {
666         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
667 }
668
669 static const struct net_device_ops ieee80211_dataif_ops = {
670         .ndo_open               = ieee80211_open,
671         .ndo_stop               = ieee80211_stop,
672         .ndo_uninit             = ieee80211_teardown_sdata,
673         .ndo_start_xmit         = ieee80211_subif_start_xmit,
674         .ndo_set_multicast_list = ieee80211_set_multicast_list,
675         .ndo_change_mtu         = ieee80211_change_mtu,
676         .ndo_set_mac_address    = ieee80211_change_mac,
677         .ndo_select_queue       = ieee80211_netdev_select_queue,
678 };
679
680 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
681                                           struct sk_buff *skb)
682 {
683         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
684         struct ieee80211_local *local = sdata->local;
685         struct ieee80211_hdr *hdr;
686         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
687         u8 *p;
688
689         if (local->hw.queues < 4)
690                 return 0;
691
692         if (skb->len < 4 ||
693             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
694                 return 0; /* doesn't matter, frame will be dropped */
695
696         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
697
698         if (!ieee80211_is_data_qos(hdr->frame_control)) {
699                 skb->priority = 7;
700                 return ieee802_1d_to_ac[skb->priority];
701         }
702
703         p = ieee80211_get_qos_ctl(hdr);
704         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
705
706         return ieee80211_downgrade_queue(local, skb);
707 }
708
709 static const struct net_device_ops ieee80211_monitorif_ops = {
710         .ndo_open               = ieee80211_open,
711         .ndo_stop               = ieee80211_stop,
712         .ndo_uninit             = ieee80211_teardown_sdata,
713         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
714         .ndo_set_multicast_list = ieee80211_set_multicast_list,
715         .ndo_change_mtu         = ieee80211_change_mtu,
716         .ndo_set_mac_address    = eth_mac_addr,
717         .ndo_select_queue       = ieee80211_monitor_select_queue,
718 };
719
720 static void ieee80211_if_setup(struct net_device *dev)
721 {
722         ether_setup(dev);
723         dev->netdev_ops = &ieee80211_dataif_ops;
724         dev->destructor = free_netdev;
725 }
726
727 /*
728  * Helper function to initialise an interface to a specific type.
729  */
730 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
731                                   enum nl80211_iftype type)
732 {
733         /* clear type-dependent union */
734         memset(&sdata->u, 0, sizeof(sdata->u));
735
736         /* and set some type-dependent values */
737         sdata->vif.type = type;
738         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
739         sdata->wdev.iftype = type;
740
741         /* only monitor differs */
742         sdata->dev->type = ARPHRD_ETHER;
743
744         switch (type) {
745         case NL80211_IFTYPE_AP:
746                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
747                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
748                 break;
749         case NL80211_IFTYPE_STATION:
750                 ieee80211_sta_setup_sdata(sdata);
751                 break;
752         case NL80211_IFTYPE_ADHOC:
753                 ieee80211_ibss_setup_sdata(sdata);
754                 break;
755         case NL80211_IFTYPE_MESH_POINT:
756                 if (ieee80211_vif_is_mesh(&sdata->vif))
757                         ieee80211_mesh_init_sdata(sdata);
758                 break;
759         case NL80211_IFTYPE_MONITOR:
760                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
761                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
762                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
763                                       MONITOR_FLAG_OTHER_BSS;
764                 break;
765         case NL80211_IFTYPE_WDS:
766         case NL80211_IFTYPE_AP_VLAN:
767                 break;
768         case NL80211_IFTYPE_UNSPECIFIED:
769         case __NL80211_IFTYPE_AFTER_LAST:
770                 BUG();
771                 break;
772         }
773
774         ieee80211_debugfs_add_netdev(sdata);
775 }
776
777 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
778                              enum nl80211_iftype type)
779 {
780         ASSERT_RTNL();
781
782         if (type == sdata->vif.type)
783                 return 0;
784
785         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
786         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
787             type == NL80211_IFTYPE_ADHOC)
788                 return -EOPNOTSUPP;
789
790         /*
791          * We could, here, on changes between IBSS/STA/MESH modes,
792          * invoke an MLME function instead that disassociates etc.
793          * and goes into the requested mode.
794          */
795
796         if (ieee80211_sdata_running(sdata))
797                 return -EBUSY;
798
799         /* Purge and reset type-dependent state. */
800         ieee80211_teardown_sdata(sdata->dev);
801         ieee80211_setup_sdata(sdata, type);
802
803         /* reset some values that shouldn't be kept across type changes */
804         sdata->vif.bss_conf.basic_rates =
805                 ieee80211_mandatory_rates(sdata->local,
806                         sdata->local->hw.conf.channel->band);
807         sdata->drop_unencrypted = 0;
808         if (type == NL80211_IFTYPE_STATION)
809                 sdata->u.mgd.use_4addr = false;
810
811         return 0;
812 }
813
814 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
815                      struct net_device **new_dev, enum nl80211_iftype type,
816                      struct vif_params *params)
817 {
818         struct net_device *ndev;
819         struct ieee80211_sub_if_data *sdata = NULL;
820         int ret, i;
821
822         ASSERT_RTNL();
823
824         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
825                                name, ieee80211_if_setup, local->hw.queues);
826         if (!ndev)
827                 return -ENOMEM;
828         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
829
830         ndev->needed_headroom = local->tx_headroom +
831                                 4*6 /* four MAC addresses */
832                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
833                                 + 6 /* mesh */
834                                 + 8 /* rfc1042/bridge tunnel */
835                                 - ETH_HLEN /* ethernet hard_header_len */
836                                 + IEEE80211_ENCRYPT_HEADROOM;
837         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
838
839         ret = dev_alloc_name(ndev, ndev->name);
840         if (ret < 0)
841                 goto fail;
842
843         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
844         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
845         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
846
847         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
848         sdata = netdev_priv(ndev);
849         ndev->ieee80211_ptr = &sdata->wdev;
850         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
851         memcpy(sdata->name, ndev->name, IFNAMSIZ);
852
853         /* initialise type-independent data */
854         sdata->wdev.wiphy = local->hw.wiphy;
855         sdata->local = local;
856         sdata->dev = ndev;
857
858         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
859                 skb_queue_head_init(&sdata->fragments[i].skb_list);
860
861         INIT_LIST_HEAD(&sdata->key_list);
862
863         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
864                 struct ieee80211_supported_band *sband;
865                 sband = local->hw.wiphy->bands[i];
866                 sdata->rc_rateidx_mask[i] =
867                         sband ? (1 << sband->n_bitrates) - 1 : 0;
868         }
869
870         /* setup type-dependent data */
871         ieee80211_setup_sdata(sdata, type);
872
873         if (params) {
874                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
875                 if (type == NL80211_IFTYPE_STATION)
876                         sdata->u.mgd.use_4addr = params->use_4addr;
877         }
878
879         ret = register_netdevice(ndev);
880         if (ret)
881                 goto fail;
882
883         if (ieee80211_vif_is_mesh(&sdata->vif) &&
884             params && params->mesh_id_len)
885                 ieee80211_sdata_set_mesh_id(sdata,
886                                             params->mesh_id_len,
887                                             params->mesh_id);
888
889         mutex_lock(&local->iflist_mtx);
890         list_add_tail_rcu(&sdata->list, &local->interfaces);
891         mutex_unlock(&local->iflist_mtx);
892
893         if (new_dev)
894                 *new_dev = ndev;
895
896         return 0;
897
898  fail:
899         free_netdev(ndev);
900         return ret;
901 }
902
903 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
904 {
905         ASSERT_RTNL();
906
907         mutex_lock(&sdata->local->iflist_mtx);
908         list_del_rcu(&sdata->list);
909         mutex_unlock(&sdata->local->iflist_mtx);
910
911         synchronize_rcu();
912         unregister_netdevice(sdata->dev);
913 }
914
915 /*
916  * Remove all interfaces, may only be called at hardware unregistration
917  * time because it doesn't do RCU-safe list removals.
918  */
919 void ieee80211_remove_interfaces(struct ieee80211_local *local)
920 {
921         struct ieee80211_sub_if_data *sdata, *tmp;
922         LIST_HEAD(unreg_list);
923
924         ASSERT_RTNL();
925
926         mutex_lock(&local->iflist_mtx);
927         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
928                 list_del(&sdata->list);
929
930                 unregister_netdevice_queue(sdata->dev, &unreg_list);
931         }
932         mutex_unlock(&local->iflist_mtx);
933         unregister_netdevice_many(&unreg_list);
934 }
935
936 static u32 ieee80211_idle_off(struct ieee80211_local *local,
937                               const char *reason)
938 {
939         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
940                 return 0;
941
942 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
943         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
944                wiphy_name(local->hw.wiphy), reason);
945 #endif
946
947         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
948         return IEEE80211_CONF_CHANGE_IDLE;
949 }
950
951 static u32 ieee80211_idle_on(struct ieee80211_local *local)
952 {
953         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
954                 return 0;
955
956 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
957         printk(KERN_DEBUG "%s: device now idle\n",
958                wiphy_name(local->hw.wiphy));
959 #endif
960
961         drv_flush(local, false);
962
963         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
964         return IEEE80211_CONF_CHANGE_IDLE;
965 }
966
967 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
968 {
969         struct ieee80211_sub_if_data *sdata;
970         int count = 0;
971
972         if (!list_empty(&local->work_list))
973                 return ieee80211_idle_off(local, "working");
974
975         if (local->scanning)
976                 return ieee80211_idle_off(local, "scanning");
977
978         list_for_each_entry(sdata, &local->interfaces, list) {
979                 if (!ieee80211_sdata_running(sdata))
980                         continue;
981                 /* do not count disabled managed interfaces */
982                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
983                     !sdata->u.mgd.associated)
984                         continue;
985                 /* do not count unused IBSS interfaces */
986                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
987                     !sdata->u.ibss.ssid_len)
988                         continue;
989                 /* count everything else */
990                 count++;
991         }
992
993         if (!count)
994                 return ieee80211_idle_on(local);
995         else
996                 return ieee80211_idle_off(local, "in use");
997
998         return 0;
999 }
1000
1001 void ieee80211_recalc_idle(struct ieee80211_local *local)
1002 {
1003         u32 chg;
1004
1005         mutex_lock(&local->iflist_mtx);
1006         chg = __ieee80211_recalc_idle(local);
1007         mutex_unlock(&local->iflist_mtx);
1008         if (chg)
1009                 ieee80211_hw_config(local, chg);
1010 }
1011
1012 static int netdev_notify(struct notifier_block *nb,
1013                          unsigned long state,
1014                          void *ndev)
1015 {
1016         struct net_device *dev = ndev;
1017         struct ieee80211_sub_if_data *sdata;
1018
1019         if (state != NETDEV_CHANGENAME)
1020                 return 0;
1021
1022         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1023                 return 0;
1024
1025         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1026                 return 0;
1027
1028         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1029
1030         memcpy(sdata->name, sdata->name, IFNAMSIZ);
1031
1032         ieee80211_debugfs_rename_netdev(sdata);
1033         return 0;
1034 }
1035
1036 static struct notifier_block mac80211_netdev_notifier = {
1037         .notifier_call = netdev_notify,
1038 };
1039
1040 int ieee80211_iface_init(void)
1041 {
1042         return register_netdevice_notifier(&mac80211_netdev_notifier);
1043 }
1044
1045 void ieee80211_iface_exit(void)
1046 {
1047         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1048 }