mac80211: fix queue selection for data frames on monitor interfaces
[linux-2.6.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling (except master interface)
3  *
4  * Copyright 2002-2005, Instant802 Networks, Inc.
5  * Copyright 2005-2006, Devicescape Software, Inc.
6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/kernel.h>
14 #include <linux/if_arp.h>
15 #include <linux/netdevice.h>
16 #include <linux/rtnetlink.h>
17 #include <net/mac80211.h>
18 #include <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 inline int identical_mac_addr_allowed(int type1, int type2)
66 {
67         return type1 == NL80211_IFTYPE_MONITOR ||
68                 type2 == NL80211_IFTYPE_MONITOR ||
69                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
70                 (type1 == NL80211_IFTYPE_WDS &&
71                         (type2 == NL80211_IFTYPE_WDS ||
72                          type2 == NL80211_IFTYPE_AP)) ||
73                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
74                 (type1 == NL80211_IFTYPE_AP_VLAN &&
75                         (type2 == NL80211_IFTYPE_AP ||
76                          type2 == NL80211_IFTYPE_AP_VLAN));
77 }
78
79 static int ieee80211_open(struct net_device *dev)
80 {
81         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
82         struct ieee80211_sub_if_data *nsdata;
83         struct ieee80211_local *local = sdata->local;
84         struct sta_info *sta;
85         struct ieee80211_if_init_conf conf;
86         u32 changed = 0;
87         int res;
88         u32 hw_reconf_flags = 0;
89         u8 null_addr[ETH_ALEN] = {0};
90
91         /* fail early if user set an invalid address */
92         if (compare_ether_addr(dev->dev_addr, null_addr) &&
93             !is_valid_ether_addr(dev->dev_addr))
94                 return -EADDRNOTAVAIL;
95
96         /* we hold the RTNL here so can safely walk the list */
97         list_for_each_entry(nsdata, &local->interfaces, list) {
98                 struct net_device *ndev = nsdata->dev;
99
100                 if (ndev != dev && netif_running(ndev)) {
101                         /*
102                          * Allow only a single IBSS interface to be up at any
103                          * time. This is restricted because beacon distribution
104                          * cannot work properly if both are in the same IBSS.
105                          *
106                          * To remove this restriction we'd have to disallow them
107                          * from setting the same SSID on different IBSS interfaces
108                          * belonging to the same hardware. Then, however, we're
109                          * faced with having to adopt two different TSF timers...
110                          */
111                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
112                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
113                                 return -EBUSY;
114
115                         /*
116                          * The remaining checks are only performed for interfaces
117                          * with the same MAC address.
118                          */
119                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
120                                 continue;
121
122                         /*
123                          * check whether it may have the same address
124                          */
125                         if (!identical_mac_addr_allowed(sdata->vif.type,
126                                                         nsdata->vif.type))
127                                 return -ENOTUNIQ;
128
129                         /*
130                          * can only add VLANs to enabled APs
131                          */
132                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
133                             nsdata->vif.type == NL80211_IFTYPE_AP)
134                                 sdata->bss = &nsdata->u.ap;
135                 }
136         }
137
138         switch (sdata->vif.type) {
139         case NL80211_IFTYPE_WDS:
140                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
141                         return -ENOLINK;
142                 break;
143         case NL80211_IFTYPE_AP_VLAN:
144                 if (!sdata->bss)
145                         return -ENOLINK;
146                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
147                 break;
148         case NL80211_IFTYPE_AP:
149                 sdata->bss = &sdata->u.ap;
150                 break;
151         case NL80211_IFTYPE_MESH_POINT:
152                 if (!ieee80211_vif_is_mesh(&sdata->vif))
153                         break;
154                 /* mesh ifaces must set allmulti to forward mcast traffic */
155                 atomic_inc(&local->iff_allmultis);
156                 break;
157         case NL80211_IFTYPE_STATION:
158         case NL80211_IFTYPE_MONITOR:
159         case NL80211_IFTYPE_ADHOC:
160                 /* no special treatment */
161                 break;
162         case NL80211_IFTYPE_UNSPECIFIED:
163         case __NL80211_IFTYPE_AFTER_LAST:
164                 /* cannot happen */
165                 WARN_ON(1);
166                 break;
167         }
168
169         if (local->open_count == 0) {
170                 res = drv_start(local);
171                 if (res)
172                         goto err_del_bss;
173                 /* we're brought up, everything changes */
174                 hw_reconf_flags = ~0;
175                 ieee80211_led_radio(local, true);
176         }
177
178         /*
179          * Check all interfaces and copy the hopefully now-present
180          * MAC address to those that have the special null one.
181          */
182         list_for_each_entry(nsdata, &local->interfaces, list) {
183                 struct net_device *ndev = nsdata->dev;
184
185                 /*
186                  * No need to check netif_running since we do not allow
187                  * it to start up with this invalid address.
188                  */
189                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
190                         memcpy(ndev->dev_addr,
191                                local->hw.wiphy->perm_addr,
192                                ETH_ALEN);
193                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
194                 }
195         }
196
197         /*
198          * Validate the MAC address for this device.
199          */
200         if (!is_valid_ether_addr(dev->dev_addr)) {
201                 if (!local->open_count)
202                         drv_stop(local);
203                 return -EADDRNOTAVAIL;
204         }
205
206         switch (sdata->vif.type) {
207         case NL80211_IFTYPE_AP_VLAN:
208                 /* no need to tell driver */
209                 break;
210         case NL80211_IFTYPE_MONITOR:
211                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
212                         local->cooked_mntrs++;
213                         break;
214                 }
215
216                 /* must be before the call to ieee80211_configure_filter */
217                 local->monitors++;
218                 if (local->monitors == 1) {
219                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
220                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
221                 }
222
223                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
224                         local->fif_fcsfail++;
225                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
226                         local->fif_plcpfail++;
227                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
228                         local->fif_control++;
229                         local->fif_pspoll++;
230                 }
231                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
232                         local->fif_other_bss++;
233
234                 ieee80211_configure_filter(local);
235                 break;
236         default:
237                 conf.vif = &sdata->vif;
238                 conf.type = sdata->vif.type;
239                 conf.mac_addr = dev->dev_addr;
240                 res = drv_add_interface(local, &conf);
241                 if (res)
242                         goto err_stop;
243
244                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
245                         local->fif_other_bss++;
246                         ieee80211_configure_filter(local);
247
248                         ieee80211_start_mesh(sdata);
249                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
250                         local->fif_pspoll++;
251
252                         ieee80211_configure_filter(local);
253                 }
254
255                 changed |= ieee80211_reset_erp_info(sdata);
256                 ieee80211_bss_info_change_notify(sdata, changed);
257                 ieee80211_enable_keys(sdata);
258
259                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
260                         netif_carrier_off(dev);
261                 else
262                         netif_carrier_on(dev);
263         }
264
265         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
266                 /* Create STA entry for the WDS peer */
267                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
268                                      GFP_KERNEL);
269                 if (!sta) {
270                         res = -ENOMEM;
271                         goto err_del_interface;
272                 }
273
274                 /* no locking required since STA is not live yet */
275                 sta->flags |= WLAN_STA_AUTHORIZED;
276
277                 res = sta_info_insert(sta);
278                 if (res) {
279                         /* STA has been freed */
280                         goto err_del_interface;
281                 }
282         }
283
284         /*
285          * set_multicast_list will be invoked by the networking core
286          * which will check whether any increments here were done in
287          * error and sync them down to the hardware as filter flags.
288          */
289         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
290                 atomic_inc(&local->iff_allmultis);
291
292         if (sdata->flags & IEEE80211_SDATA_PROMISC)
293                 atomic_inc(&local->iff_promiscs);
294
295         hw_reconf_flags |= __ieee80211_recalc_idle(local);
296
297         local->open_count++;
298         if (hw_reconf_flags) {
299                 ieee80211_hw_config(local, hw_reconf_flags);
300                 /*
301                  * set default queue parameters so drivers don't
302                  * need to initialise the hardware if the hardware
303                  * doesn't start up with sane defaults
304                  */
305                 ieee80211_set_wmm_default(sdata);
306         }
307
308         ieee80211_recalc_ps(local, -1);
309
310         /*
311          * ieee80211_sta_work is disabled while network interface
312          * is down. Therefore, some configuration changes may not
313          * yet be effective. Trigger execution of ieee80211_sta_work
314          * to fix this.
315          */
316         if (sdata->vif.type == NL80211_IFTYPE_STATION)
317                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
318
319         netif_tx_start_all_queues(dev);
320
321         return 0;
322  err_del_interface:
323         drv_remove_interface(local, &conf);
324  err_stop:
325         if (!local->open_count)
326                 drv_stop(local);
327  err_del_bss:
328         sdata->bss = NULL;
329         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
330                 list_del(&sdata->u.vlan.list);
331         return res;
332 }
333
334 static int ieee80211_stop(struct net_device *dev)
335 {
336         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
337         struct ieee80211_local *local = sdata->local;
338         struct ieee80211_if_init_conf conf;
339         struct sta_info *sta;
340         unsigned long flags;
341         struct sk_buff *skb, *tmp;
342         u32 hw_reconf_flags = 0;
343         int i;
344
345         /*
346          * Stop TX on this interface first.
347          */
348         netif_tx_stop_all_queues(dev);
349
350         /*
351          * Now delete all active aggregation sessions.
352          */
353         rcu_read_lock();
354
355         list_for_each_entry_rcu(sta, &local->sta_list, list) {
356                 if (sta->sdata == sdata)
357                         ieee80211_sta_tear_down_BA_sessions(sta);
358         }
359
360         rcu_read_unlock();
361
362         /*
363          * Remove all stations associated with this interface.
364          *
365          * This must be done before calling ops->remove_interface()
366          * because otherwise we can later invoke ops->sta_notify()
367          * whenever the STAs are removed, and that invalidates driver
368          * assumptions about always getting a vif pointer that is valid
369          * (because if we remove a STA after ops->remove_interface()
370          * the driver will have removed the vif info already!)
371          *
372          * We could relax this and only unlink the stations from the
373          * hash table and list but keep them on a per-sdata list that
374          * will be inserted back again when the interface is brought
375          * up again, but I don't currently see a use case for that,
376          * except with WDS which gets a STA entry created when it is
377          * brought up.
378          */
379         sta_info_flush(local, sdata);
380
381         /*
382          * Don't count this interface for promisc/allmulti while it
383          * is down. dev_mc_unsync() will invoke set_multicast_list
384          * on the master interface which will sync these down to the
385          * hardware as filter flags.
386          */
387         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
388                 atomic_dec(&local->iff_allmultis);
389
390         if (sdata->flags & IEEE80211_SDATA_PROMISC)
391                 atomic_dec(&local->iff_promiscs);
392
393         if (sdata->vif.type == NL80211_IFTYPE_AP)
394                 local->fif_pspoll--;
395
396         netif_addr_lock_bh(dev);
397         spin_lock_bh(&local->filter_lock);
398         __dev_addr_unsync(&local->mc_list, &local->mc_count,
399                           &dev->mc_list, &dev->mc_count);
400         spin_unlock_bh(&local->filter_lock);
401         netif_addr_unlock_bh(dev);
402
403         ieee80211_configure_filter(local);
404
405         del_timer_sync(&local->dynamic_ps_timer);
406         cancel_work_sync(&local->dynamic_ps_enable_work);
407
408         /* APs need special treatment */
409         if (sdata->vif.type == NL80211_IFTYPE_AP) {
410                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
411                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
412
413                 /* remove beacon */
414                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
415                 synchronize_rcu();
416                 kfree(old_beacon);
417
418                 /* down all dependent devices, that is VLANs */
419                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
420                                          u.vlan.list)
421                         dev_close(vlan->dev);
422                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
423         }
424
425         local->open_count--;
426
427         switch (sdata->vif.type) {
428         case NL80211_IFTYPE_AP_VLAN:
429                 list_del(&sdata->u.vlan.list);
430                 /* no need to tell driver */
431                 break;
432         case NL80211_IFTYPE_MONITOR:
433                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
434                         local->cooked_mntrs--;
435                         break;
436                 }
437
438                 local->monitors--;
439                 if (local->monitors == 0) {
440                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
441                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
442                 }
443
444                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
445                         local->fif_fcsfail--;
446                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
447                         local->fif_plcpfail--;
448                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
449                         local->fif_pspoll--;
450                         local->fif_control--;
451                 }
452                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
453                         local->fif_other_bss--;
454
455                 ieee80211_configure_filter(local);
456                 break;
457         case NL80211_IFTYPE_STATION:
458                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
459                 del_timer_sync(&sdata->u.mgd.timer);
460                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
461                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
462                 /*
463                  * If any of the timers fired while we waited for it, it will
464                  * have queued its work. Now the work will be running again
465                  * but will not rearm the timer again because it checks
466                  * whether the interface is running, which, at this point,
467                  * it no longer is.
468                  */
469                 cancel_work_sync(&sdata->u.mgd.work);
470                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
471                 cancel_work_sync(&sdata->u.mgd.monitor_work);
472                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
473
474                 /*
475                  * When we get here, the interface is marked down.
476                  * Call synchronize_rcu() to wait for the RX path
477                  * should it be using the interface and enqueuing
478                  * frames at this very time on another CPU.
479                  */
480                 synchronize_rcu();
481                 skb_queue_purge(&sdata->u.mgd.skb_queue);
482                 /* fall through */
483         case NL80211_IFTYPE_ADHOC:
484                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
485                         del_timer_sync(&sdata->u.ibss.timer);
486                         cancel_work_sync(&sdata->u.ibss.work);
487                         synchronize_rcu();
488                         skb_queue_purge(&sdata->u.ibss.skb_queue);
489                 }
490                 /* fall through */
491         case NL80211_IFTYPE_MESH_POINT:
492                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
493                         /* other_bss and allmulti are always set on mesh
494                          * ifaces */
495                         local->fif_other_bss--;
496                         atomic_dec(&local->iff_allmultis);
497
498                         ieee80211_configure_filter(local);
499
500                         ieee80211_stop_mesh(sdata);
501                 }
502                 /* fall through */
503         default:
504                 if (local->scan_sdata == sdata)
505                         ieee80211_scan_cancel(local);
506
507                 /*
508                  * Disable beaconing for AP and mesh, IBSS can't
509                  * still be joined to a network at this point.
510                  */
511                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
512                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
513                         ieee80211_bss_info_change_notify(sdata,
514                                 BSS_CHANGED_BEACON_ENABLED);
515                 }
516
517                 conf.vif = &sdata->vif;
518                 conf.type = sdata->vif.type;
519                 conf.mac_addr = dev->dev_addr;
520                 /* disable all keys for as long as this netdev is down */
521                 ieee80211_disable_keys(sdata);
522                 drv_remove_interface(local, &conf);
523         }
524
525         sdata->bss = NULL;
526
527         hw_reconf_flags |= __ieee80211_recalc_idle(local);
528
529         ieee80211_recalc_ps(local, -1);
530
531         if (local->open_count == 0) {
532                 ieee80211_clear_tx_pending(local);
533                 ieee80211_stop_device(local);
534
535                 /* no reconfiguring after stop! */
536                 hw_reconf_flags = 0;
537         }
538
539         /* do after stop to avoid reconfiguring when we stop anyway */
540         if (hw_reconf_flags)
541                 ieee80211_hw_config(local, hw_reconf_flags);
542
543         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
544         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
545                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
546                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
547                         if (info->control.vif == &sdata->vif) {
548                                 __skb_unlink(skb, &local->pending[i]);
549                                 dev_kfree_skb_irq(skb);
550                         }
551                 }
552         }
553         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
554
555         return 0;
556 }
557
558 static void ieee80211_set_multicast_list(struct net_device *dev)
559 {
560         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
561         struct ieee80211_local *local = sdata->local;
562         int allmulti, promisc, sdata_allmulti, sdata_promisc;
563
564         allmulti = !!(dev->flags & IFF_ALLMULTI);
565         promisc = !!(dev->flags & IFF_PROMISC);
566         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
567         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
568
569         if (allmulti != sdata_allmulti) {
570                 if (dev->flags & IFF_ALLMULTI)
571                         atomic_inc(&local->iff_allmultis);
572                 else
573                         atomic_dec(&local->iff_allmultis);
574                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
575         }
576
577         if (promisc != sdata_promisc) {
578                 if (dev->flags & IFF_PROMISC)
579                         atomic_inc(&local->iff_promiscs);
580                 else
581                         atomic_dec(&local->iff_promiscs);
582                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
583         }
584         spin_lock_bh(&local->filter_lock);
585         __dev_addr_sync(&local->mc_list, &local->mc_count,
586                         &dev->mc_list, &dev->mc_count);
587         spin_unlock_bh(&local->filter_lock);
588         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
589 }
590
591 /*
592  * Called when the netdev is removed or, by the code below, before
593  * the interface type changes.
594  */
595 static void ieee80211_teardown_sdata(struct net_device *dev)
596 {
597         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
598         struct ieee80211_local *local = sdata->local;
599         struct beacon_data *beacon;
600         struct sk_buff *skb;
601         int flushed;
602         int i;
603
604         /* free extra data */
605         ieee80211_free_keys(sdata);
606
607         ieee80211_debugfs_remove_netdev(sdata);
608
609         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
610                 __skb_queue_purge(&sdata->fragments[i].skb_list);
611         sdata->fragment_next = 0;
612
613         switch (sdata->vif.type) {
614         case NL80211_IFTYPE_AP:
615                 beacon = sdata->u.ap.beacon;
616                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
617                 synchronize_rcu();
618                 kfree(beacon);
619
620                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
621                         local->total_ps_buffered--;
622                         dev_kfree_skb(skb);
623                 }
624
625                 break;
626         case NL80211_IFTYPE_MESH_POINT:
627                 if (ieee80211_vif_is_mesh(&sdata->vif))
628                         mesh_rmc_free(sdata);
629                 break;
630         case NL80211_IFTYPE_ADHOC:
631                 if (WARN_ON(sdata->u.ibss.presp))
632                         kfree_skb(sdata->u.ibss.presp);
633                 break;
634         case NL80211_IFTYPE_STATION:
635         case NL80211_IFTYPE_WDS:
636         case NL80211_IFTYPE_AP_VLAN:
637         case NL80211_IFTYPE_MONITOR:
638                 break;
639         case NL80211_IFTYPE_UNSPECIFIED:
640         case __NL80211_IFTYPE_AFTER_LAST:
641                 BUG();
642                 break;
643         }
644
645         flushed = sta_info_flush(local, sdata);
646         WARN_ON(flushed);
647 }
648
649 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
650                                          struct sk_buff *skb)
651 {
652         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
653 }
654
655 static const struct net_device_ops ieee80211_dataif_ops = {
656         .ndo_open               = ieee80211_open,
657         .ndo_stop               = ieee80211_stop,
658         .ndo_uninit             = ieee80211_teardown_sdata,
659         .ndo_start_xmit         = ieee80211_subif_start_xmit,
660         .ndo_set_multicast_list = ieee80211_set_multicast_list,
661         .ndo_change_mtu         = ieee80211_change_mtu,
662         .ndo_set_mac_address    = eth_mac_addr,
663         .ndo_select_queue       = ieee80211_netdev_select_queue,
664 };
665
666 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
667                                           struct sk_buff *skb)
668 {
669         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
670         struct ieee80211_local *local = sdata->local;
671         struct ieee80211_hdr *hdr;
672         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
673         u8 *p;
674
675         if (local->hw.queues < 4)
676                 return 0;
677
678         if (skb->len < 4 ||
679             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
680                 return 0; /* doesn't matter, frame will be dropped */
681
682         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
683
684         if (!ieee80211_is_data_qos(hdr->frame_control)) {
685                 skb->priority = 7;
686                 return ieee802_1d_to_ac[skb->priority];
687         }
688
689         p = ieee80211_get_qos_ctl(hdr);
690         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
691
692         return ieee80211_downgrade_queue(local, skb);
693 }
694
695 static const struct net_device_ops ieee80211_monitorif_ops = {
696         .ndo_open               = ieee80211_open,
697         .ndo_stop               = ieee80211_stop,
698         .ndo_uninit             = ieee80211_teardown_sdata,
699         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
700         .ndo_set_multicast_list = ieee80211_set_multicast_list,
701         .ndo_change_mtu         = ieee80211_change_mtu,
702         .ndo_set_mac_address    = eth_mac_addr,
703         .ndo_select_queue       = ieee80211_monitor_select_queue,
704 };
705
706 static void ieee80211_if_setup(struct net_device *dev)
707 {
708         ether_setup(dev);
709         dev->netdev_ops = &ieee80211_dataif_ops;
710         dev->destructor = free_netdev;
711 }
712
713 /*
714  * Helper function to initialise an interface to a specific type.
715  */
716 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
717                                   enum nl80211_iftype type)
718 {
719         /* clear type-dependent union */
720         memset(&sdata->u, 0, sizeof(sdata->u));
721
722         /* and set some type-dependent values */
723         sdata->vif.type = type;
724         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
725         sdata->wdev.iftype = type;
726
727         /* only monitor differs */
728         sdata->dev->type = ARPHRD_ETHER;
729
730         switch (type) {
731         case NL80211_IFTYPE_AP:
732                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
733                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
734                 break;
735         case NL80211_IFTYPE_STATION:
736                 ieee80211_sta_setup_sdata(sdata);
737                 break;
738         case NL80211_IFTYPE_ADHOC:
739                 ieee80211_ibss_setup_sdata(sdata);
740                 break;
741         case NL80211_IFTYPE_MESH_POINT:
742                 if (ieee80211_vif_is_mesh(&sdata->vif))
743                         ieee80211_mesh_init_sdata(sdata);
744                 break;
745         case NL80211_IFTYPE_MONITOR:
746                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
747                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
748                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
749                                       MONITOR_FLAG_OTHER_BSS;
750                 break;
751         case NL80211_IFTYPE_WDS:
752         case NL80211_IFTYPE_AP_VLAN:
753                 break;
754         case NL80211_IFTYPE_UNSPECIFIED:
755         case __NL80211_IFTYPE_AFTER_LAST:
756                 BUG();
757                 break;
758         }
759
760         ieee80211_debugfs_add_netdev(sdata);
761 }
762
763 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
764                              enum nl80211_iftype type)
765 {
766         ASSERT_RTNL();
767
768         if (type == sdata->vif.type)
769                 return 0;
770
771         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
772         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
773             type == NL80211_IFTYPE_ADHOC)
774                 return -EOPNOTSUPP;
775
776         /*
777          * We could, here, on changes between IBSS/STA/MESH modes,
778          * invoke an MLME function instead that disassociates etc.
779          * and goes into the requested mode.
780          */
781
782         if (netif_running(sdata->dev))
783                 return -EBUSY;
784
785         /* Purge and reset type-dependent state. */
786         ieee80211_teardown_sdata(sdata->dev);
787         ieee80211_setup_sdata(sdata, type);
788
789         /* reset some values that shouldn't be kept across type changes */
790         sdata->vif.bss_conf.basic_rates =
791                 ieee80211_mandatory_rates(sdata->local,
792                         sdata->local->hw.conf.channel->band);
793         sdata->drop_unencrypted = 0;
794         if (type == NL80211_IFTYPE_STATION)
795                 sdata->u.mgd.use_4addr = false;
796
797         return 0;
798 }
799
800 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
801                      struct net_device **new_dev, enum nl80211_iftype type,
802                      struct vif_params *params)
803 {
804         struct net_device *ndev;
805         struct ieee80211_sub_if_data *sdata = NULL;
806         int ret, i;
807
808         ASSERT_RTNL();
809
810         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
811                                name, ieee80211_if_setup, local->hw.queues);
812         if (!ndev)
813                 return -ENOMEM;
814         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
815
816         ndev->needed_headroom = local->tx_headroom +
817                                 4*6 /* four MAC addresses */
818                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
819                                 + 6 /* mesh */
820                                 + 8 /* rfc1042/bridge tunnel */
821                                 - ETH_HLEN /* ethernet hard_header_len */
822                                 + IEEE80211_ENCRYPT_HEADROOM;
823         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
824
825         ret = dev_alloc_name(ndev, ndev->name);
826         if (ret < 0)
827                 goto fail;
828
829         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
830         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
831         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
832
833         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
834         sdata = netdev_priv(ndev);
835         ndev->ieee80211_ptr = &sdata->wdev;
836
837         /* initialise type-independent data */
838         sdata->wdev.wiphy = local->hw.wiphy;
839         sdata->local = local;
840         sdata->dev = ndev;
841
842         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
843                 skb_queue_head_init(&sdata->fragments[i].skb_list);
844
845         INIT_LIST_HEAD(&sdata->key_list);
846
847         sdata->force_unicast_rateidx = -1;
848         sdata->max_ratectrl_rateidx = -1;
849
850         /* setup type-dependent data */
851         ieee80211_setup_sdata(sdata, type);
852
853         if (params) {
854                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
855                 if (type == NL80211_IFTYPE_STATION)
856                         sdata->u.mgd.use_4addr = params->use_4addr;
857         }
858
859         ret = register_netdevice(ndev);
860         if (ret)
861                 goto fail;
862
863         if (ieee80211_vif_is_mesh(&sdata->vif) &&
864             params && params->mesh_id_len)
865                 ieee80211_sdata_set_mesh_id(sdata,
866                                             params->mesh_id_len,
867                                             params->mesh_id);
868
869         mutex_lock(&local->iflist_mtx);
870         list_add_tail_rcu(&sdata->list, &local->interfaces);
871         mutex_unlock(&local->iflist_mtx);
872
873         if (new_dev)
874                 *new_dev = ndev;
875
876         return 0;
877
878  fail:
879         free_netdev(ndev);
880         return ret;
881 }
882
883 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
884 {
885         ASSERT_RTNL();
886
887         mutex_lock(&sdata->local->iflist_mtx);
888         list_del_rcu(&sdata->list);
889         mutex_unlock(&sdata->local->iflist_mtx);
890
891         synchronize_rcu();
892         unregister_netdevice(sdata->dev);
893 }
894
895 /*
896  * Remove all interfaces, may only be called at hardware unregistration
897  * time because it doesn't do RCU-safe list removals.
898  */
899 void ieee80211_remove_interfaces(struct ieee80211_local *local)
900 {
901         struct ieee80211_sub_if_data *sdata, *tmp;
902         LIST_HEAD(unreg_list);
903
904         ASSERT_RTNL();
905
906         mutex_lock(&local->iflist_mtx);
907         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
908                 list_del(&sdata->list);
909
910                 unregister_netdevice_queue(sdata->dev, &unreg_list);
911         }
912         mutex_unlock(&local->iflist_mtx);
913         unregister_netdevice_many(&unreg_list);
914 }
915
916 static u32 ieee80211_idle_off(struct ieee80211_local *local,
917                               const char *reason)
918 {
919         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
920                 return 0;
921
922 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
923         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
924                wiphy_name(local->hw.wiphy), reason);
925 #endif
926
927         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
928         return IEEE80211_CONF_CHANGE_IDLE;
929 }
930
931 static u32 ieee80211_idle_on(struct ieee80211_local *local)
932 {
933         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
934                 return 0;
935
936 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
937         printk(KERN_DEBUG "%s: device now idle\n",
938                wiphy_name(local->hw.wiphy));
939 #endif
940
941         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
942         return IEEE80211_CONF_CHANGE_IDLE;
943 }
944
945 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
946 {
947         struct ieee80211_sub_if_data *sdata;
948         int count = 0;
949
950         if (local->scanning)
951                 return ieee80211_idle_off(local, "scanning");
952
953         list_for_each_entry(sdata, &local->interfaces, list) {
954                 if (!netif_running(sdata->dev))
955                         continue;
956                 /* do not count disabled managed interfaces */
957                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
958                     !sdata->u.mgd.associated &&
959                     list_empty(&sdata->u.mgd.work_list))
960                         continue;
961                 /* do not count unused IBSS interfaces */
962                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
963                     !sdata->u.ibss.ssid_len)
964                         continue;
965                 /* count everything else */
966                 count++;
967         }
968
969         if (!count)
970                 return ieee80211_idle_on(local);
971         else
972                 return ieee80211_idle_off(local, "in use");
973
974         return 0;
975 }
976
977 void ieee80211_recalc_idle(struct ieee80211_local *local)
978 {
979         u32 chg;
980
981         mutex_lock(&local->iflist_mtx);
982         chg = __ieee80211_recalc_idle(local);
983         mutex_unlock(&local->iflist_mtx);
984         if (chg)
985                 ieee80211_hw_config(local, chg);
986 }