mac80211: add ieee80211_sdata_running
[linux-2.6.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling (except master interface)
3  *
4  * Copyright 2002-2005, Instant802 Networks, Inc.
5  * Copyright 2005-2006, Devicescape Software, Inc.
6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/kernel.h>
14 #include <linux/if_arp.h>
15 #include <linux/netdevice.h>
16 #include <linux/rtnetlink.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "sta_info.h"
20 #include "debugfs_netdev.h"
21 #include "mesh.h"
22 #include "led.h"
23 #include "driver-ops.h"
24
25 /**
26  * DOC: Interface list locking
27  *
28  * The interface list in each struct ieee80211_local is protected
29  * three-fold:
30  *
31  * (1) modifications may only be done under the RTNL
32  * (2) modifications and readers are protected against each other by
33  *     the iflist_mtx.
34  * (3) modifications are done in an RCU manner so atomic readers
35  *     can traverse the list in RCU-safe blocks.
36  *
37  * As a consequence, reads (traversals) of the list can be protected
38  * by either the RTNL, the iflist_mtx or RCU.
39  */
40
41
42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
43 {
44         int meshhdrlen;
45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
46
47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
48
49         /* FIX: what would be proper limits for MTU?
50          * This interface uses 802.3 frames. */
51         if (new_mtu < 256 ||
52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
53                 return -EINVAL;
54         }
55
56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
57         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
59         dev->mtu = new_mtu;
60         return 0;
61 }
62
63 static int ieee80211_change_mac(struct net_device *dev, void *addr)
64 {
65         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
66         int ret;
67
68         if (ieee80211_sdata_running(sdata))
69                 return -EBUSY;
70
71         ret = eth_mac_addr(dev, addr);
72
73         if (ret == 0)
74                 memcpy(sdata->vif.addr, addr, ETH_ALEN);
75
76         return ret;
77 }
78
79 static inline int identical_mac_addr_allowed(int type1, int type2)
80 {
81         return type1 == NL80211_IFTYPE_MONITOR ||
82                 type2 == NL80211_IFTYPE_MONITOR ||
83                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
84                 (type1 == NL80211_IFTYPE_WDS &&
85                         (type2 == NL80211_IFTYPE_WDS ||
86                          type2 == NL80211_IFTYPE_AP)) ||
87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
88                 (type1 == NL80211_IFTYPE_AP_VLAN &&
89                         (type2 == NL80211_IFTYPE_AP ||
90                          type2 == NL80211_IFTYPE_AP_VLAN));
91 }
92
93 static int ieee80211_open(struct net_device *dev)
94 {
95         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
96         struct ieee80211_sub_if_data *nsdata;
97         struct ieee80211_local *local = sdata->local;
98         struct sta_info *sta;
99         struct ieee80211_if_init_conf conf;
100         u32 changed = 0;
101         int res;
102         u32 hw_reconf_flags = 0;
103         u8 null_addr[ETH_ALEN] = {0};
104
105         /* fail early if user set an invalid address */
106         if (compare_ether_addr(dev->dev_addr, null_addr) &&
107             !is_valid_ether_addr(dev->dev_addr))
108                 return -EADDRNOTAVAIL;
109
110         /* we hold the RTNL here so can safely walk the list */
111         list_for_each_entry(nsdata, &local->interfaces, list) {
112                 struct net_device *ndev = nsdata->dev;
113
114                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
115                         /*
116                          * Allow only a single IBSS interface to be up at any
117                          * time. This is restricted because beacon distribution
118                          * cannot work properly if both are in the same IBSS.
119                          *
120                          * To remove this restriction we'd have to disallow them
121                          * from setting the same SSID on different IBSS interfaces
122                          * belonging to the same hardware. Then, however, we're
123                          * faced with having to adopt two different TSF timers...
124                          */
125                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
126                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
127                                 return -EBUSY;
128
129                         /*
130                          * The remaining checks are only performed for interfaces
131                          * with the same MAC address.
132                          */
133                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
134                                 continue;
135
136                         /*
137                          * check whether it may have the same address
138                          */
139                         if (!identical_mac_addr_allowed(sdata->vif.type,
140                                                         nsdata->vif.type))
141                                 return -ENOTUNIQ;
142
143                         /*
144                          * can only add VLANs to enabled APs
145                          */
146                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
147                             nsdata->vif.type == NL80211_IFTYPE_AP)
148                                 sdata->bss = &nsdata->u.ap;
149                 }
150         }
151
152         switch (sdata->vif.type) {
153         case NL80211_IFTYPE_WDS:
154                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
155                         return -ENOLINK;
156                 break;
157         case NL80211_IFTYPE_AP_VLAN:
158                 if (!sdata->bss)
159                         return -ENOLINK;
160                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
161                 break;
162         case NL80211_IFTYPE_AP:
163                 sdata->bss = &sdata->u.ap;
164                 break;
165         case NL80211_IFTYPE_MESH_POINT:
166                 if (!ieee80211_vif_is_mesh(&sdata->vif))
167                         break;
168                 /* mesh ifaces must set allmulti to forward mcast traffic */
169                 atomic_inc(&local->iff_allmultis);
170                 break;
171         case NL80211_IFTYPE_STATION:
172         case NL80211_IFTYPE_MONITOR:
173         case NL80211_IFTYPE_ADHOC:
174                 /* no special treatment */
175                 break;
176         case NL80211_IFTYPE_UNSPECIFIED:
177         case __NL80211_IFTYPE_AFTER_LAST:
178                 /* cannot happen */
179                 WARN_ON(1);
180                 break;
181         }
182
183         if (local->open_count == 0) {
184                 res = drv_start(local);
185                 if (res)
186                         goto err_del_bss;
187                 /* we're brought up, everything changes */
188                 hw_reconf_flags = ~0;
189                 ieee80211_led_radio(local, true);
190         }
191
192         /*
193          * Check all interfaces and copy the hopefully now-present
194          * MAC address to those that have the special null one.
195          */
196         list_for_each_entry(nsdata, &local->interfaces, list) {
197                 struct net_device *ndev = nsdata->dev;
198
199                 /*
200                  * No need to check running since we do not allow
201                  * it to start up with this invalid address.
202                  */
203                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
204                         memcpy(ndev->dev_addr,
205                                local->hw.wiphy->perm_addr,
206                                ETH_ALEN);
207                         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
208                 }
209         }
210
211         /*
212          * Validate the MAC address for this device.
213          */
214         if (!is_valid_ether_addr(dev->dev_addr)) {
215                 if (!local->open_count)
216                         drv_stop(local);
217                 return -EADDRNOTAVAIL;
218         }
219
220         switch (sdata->vif.type) {
221         case NL80211_IFTYPE_AP_VLAN:
222                 /* no need to tell driver */
223                 break;
224         case NL80211_IFTYPE_MONITOR:
225                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
226                         local->cooked_mntrs++;
227                         break;
228                 }
229
230                 /* must be before the call to ieee80211_configure_filter */
231                 local->monitors++;
232                 if (local->monitors == 1) {
233                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
234                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
235                 }
236
237                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
238                         local->fif_fcsfail++;
239                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
240                         local->fif_plcpfail++;
241                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
242                         local->fif_control++;
243                         local->fif_pspoll++;
244                 }
245                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
246                         local->fif_other_bss++;
247
248                 ieee80211_configure_filter(local);
249                 break;
250         default:
251                 conf.vif = &sdata->vif;
252                 conf.type = sdata->vif.type;
253                 conf.mac_addr = sdata->vif.addr;
254                 res = drv_add_interface(local, &conf);
255                 if (res)
256                         goto err_stop;
257
258                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
259                         local->fif_other_bss++;
260                         ieee80211_configure_filter(local);
261
262                         ieee80211_start_mesh(sdata);
263                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
264                         local->fif_pspoll++;
265
266                         ieee80211_configure_filter(local);
267                 }
268
269                 changed |= ieee80211_reset_erp_info(sdata);
270                 ieee80211_bss_info_change_notify(sdata, changed);
271                 ieee80211_enable_keys(sdata);
272
273                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
274                         netif_carrier_off(dev);
275                 else
276                         netif_carrier_on(dev);
277         }
278
279         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
280                 /* Create STA entry for the WDS peer */
281                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
282                                      GFP_KERNEL);
283                 if (!sta) {
284                         res = -ENOMEM;
285                         goto err_del_interface;
286                 }
287
288                 /* no locking required since STA is not live yet */
289                 sta->flags |= WLAN_STA_AUTHORIZED;
290
291                 res = sta_info_insert(sta);
292                 if (res) {
293                         /* STA has been freed */
294                         goto err_del_interface;
295                 }
296         }
297
298         /*
299          * set_multicast_list will be invoked by the networking core
300          * which will check whether any increments here were done in
301          * error and sync them down to the hardware as filter flags.
302          */
303         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
304                 atomic_inc(&local->iff_allmultis);
305
306         if (sdata->flags & IEEE80211_SDATA_PROMISC)
307                 atomic_inc(&local->iff_promiscs);
308
309         hw_reconf_flags |= __ieee80211_recalc_idle(local);
310
311         local->open_count++;
312         if (hw_reconf_flags) {
313                 ieee80211_hw_config(local, hw_reconf_flags);
314                 /*
315                  * set default queue parameters so drivers don't
316                  * need to initialise the hardware if the hardware
317                  * doesn't start up with sane defaults
318                  */
319                 ieee80211_set_wmm_default(sdata);
320         }
321
322         ieee80211_recalc_ps(local, -1);
323
324         /*
325          * ieee80211_sta_work is disabled while network interface
326          * is down. Therefore, some configuration changes may not
327          * yet be effective. Trigger execution of ieee80211_sta_work
328          * to fix this.
329          */
330         if (sdata->vif.type == NL80211_IFTYPE_STATION)
331                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
332
333         netif_start_queue(dev);
334
335         return 0;
336  err_del_interface:
337         drv_remove_interface(local, &conf);
338  err_stop:
339         if (!local->open_count)
340                 drv_stop(local);
341  err_del_bss:
342         sdata->bss = NULL;
343         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
344                 list_del(&sdata->u.vlan.list);
345         return res;
346 }
347
348 static int ieee80211_stop(struct net_device *dev)
349 {
350         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
351         struct ieee80211_local *local = sdata->local;
352         struct ieee80211_if_init_conf conf;
353         struct sta_info *sta;
354         unsigned long flags;
355         struct sk_buff *skb, *tmp;
356         u32 hw_reconf_flags = 0;
357         int i;
358
359         /*
360          * Stop TX on this interface first.
361          */
362         netif_stop_queue(dev);
363
364         /*
365          * Now delete all active aggregation sessions.
366          */
367         rcu_read_lock();
368
369         list_for_each_entry_rcu(sta, &local->sta_list, list) {
370                 if (sta->sdata == sdata)
371                         ieee80211_sta_tear_down_BA_sessions(sta);
372         }
373
374         rcu_read_unlock();
375
376         /*
377          * Remove all stations associated with this interface.
378          *
379          * This must be done before calling ops->remove_interface()
380          * because otherwise we can later invoke ops->sta_notify()
381          * whenever the STAs are removed, and that invalidates driver
382          * assumptions about always getting a vif pointer that is valid
383          * (because if we remove a STA after ops->remove_interface()
384          * the driver will have removed the vif info already!)
385          *
386          * We could relax this and only unlink the stations from the
387          * hash table and list but keep them on a per-sdata list that
388          * will be inserted back again when the interface is brought
389          * up again, but I don't currently see a use case for that,
390          * except with WDS which gets a STA entry created when it is
391          * brought up.
392          */
393         sta_info_flush(local, sdata);
394
395         /*
396          * Don't count this interface for promisc/allmulti while it
397          * is down. dev_mc_unsync() will invoke set_multicast_list
398          * on the master interface which will sync these down to the
399          * hardware as filter flags.
400          */
401         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
402                 atomic_dec(&local->iff_allmultis);
403
404         if (sdata->flags & IEEE80211_SDATA_PROMISC)
405                 atomic_dec(&local->iff_promiscs);
406
407         if (sdata->vif.type == NL80211_IFTYPE_AP)
408                 local->fif_pspoll--;
409
410         netif_addr_lock_bh(dev);
411         spin_lock_bh(&local->filter_lock);
412         __dev_addr_unsync(&local->mc_list, &local->mc_count,
413                           &dev->mc_list, &dev->mc_count);
414         spin_unlock_bh(&local->filter_lock);
415         netif_addr_unlock_bh(dev);
416
417         ieee80211_configure_filter(local);
418
419         del_timer_sync(&local->dynamic_ps_timer);
420         cancel_work_sync(&local->dynamic_ps_enable_work);
421
422         /* APs need special treatment */
423         if (sdata->vif.type == NL80211_IFTYPE_AP) {
424                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
425                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
426
427                 /* remove beacon */
428                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
429                 synchronize_rcu();
430                 kfree(old_beacon);
431
432                 /* down all dependent devices, that is VLANs */
433                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
434                                          u.vlan.list)
435                         dev_close(vlan->dev);
436                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
437         }
438
439         local->open_count--;
440
441         switch (sdata->vif.type) {
442         case NL80211_IFTYPE_AP_VLAN:
443                 list_del(&sdata->u.vlan.list);
444                 /* no need to tell driver */
445                 break;
446         case NL80211_IFTYPE_MONITOR:
447                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
448                         local->cooked_mntrs--;
449                         break;
450                 }
451
452                 local->monitors--;
453                 if (local->monitors == 0) {
454                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
455                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
456                 }
457
458                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
459                         local->fif_fcsfail--;
460                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
461                         local->fif_plcpfail--;
462                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
463                         local->fif_pspoll--;
464                         local->fif_control--;
465                 }
466                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
467                         local->fif_other_bss--;
468
469                 ieee80211_configure_filter(local);
470                 break;
471         case NL80211_IFTYPE_STATION:
472                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
473                 del_timer_sync(&sdata->u.mgd.timer);
474                 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
475                 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
476                 /*
477                  * If any of the timers fired while we waited for it, it will
478                  * have queued its work. Now the work will be running again
479                  * but will not rearm the timer again because it checks
480                  * whether the interface is running, which, at this point,
481                  * it no longer is.
482                  */
483                 cancel_work_sync(&sdata->u.mgd.work);
484                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
485                 cancel_work_sync(&sdata->u.mgd.monitor_work);
486                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
487
488                 /*
489                  * When we get here, the interface is marked down.
490                  * Call synchronize_rcu() to wait for the RX path
491                  * should it be using the interface and enqueuing
492                  * frames at this very time on another CPU.
493                  */
494                 synchronize_rcu();
495                 skb_queue_purge(&sdata->u.mgd.skb_queue);
496                 /* fall through */
497         case NL80211_IFTYPE_ADHOC:
498                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
499                         del_timer_sync(&sdata->u.ibss.timer);
500                         cancel_work_sync(&sdata->u.ibss.work);
501                         synchronize_rcu();
502                         skb_queue_purge(&sdata->u.ibss.skb_queue);
503                 }
504                 /* fall through */
505         case NL80211_IFTYPE_MESH_POINT:
506                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
507                         /* other_bss and allmulti are always set on mesh
508                          * ifaces */
509                         local->fif_other_bss--;
510                         atomic_dec(&local->iff_allmultis);
511
512                         ieee80211_configure_filter(local);
513
514                         ieee80211_stop_mesh(sdata);
515                 }
516                 /* fall through */
517         default:
518                 if (local->scan_sdata == sdata)
519                         ieee80211_scan_cancel(local);
520
521                 /*
522                  * Disable beaconing for AP and mesh, IBSS can't
523                  * still be joined to a network at this point.
524                  */
525                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
526                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
527                         ieee80211_bss_info_change_notify(sdata,
528                                 BSS_CHANGED_BEACON_ENABLED);
529                 }
530
531                 conf.vif = &sdata->vif;
532                 conf.type = sdata->vif.type;
533                 conf.mac_addr = sdata->vif.addr;
534                 /* disable all keys for as long as this netdev is down */
535                 ieee80211_disable_keys(sdata);
536                 drv_remove_interface(local, &conf);
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 const struct net_device_ops ieee80211_dataif_ops = {
664         .ndo_open               = ieee80211_open,
665         .ndo_stop               = ieee80211_stop,
666         .ndo_uninit             = ieee80211_teardown_sdata,
667         .ndo_start_xmit         = ieee80211_subif_start_xmit,
668         .ndo_set_multicast_list = ieee80211_set_multicast_list,
669         .ndo_change_mtu         = ieee80211_change_mtu,
670         .ndo_set_mac_address    = ieee80211_change_mac,
671 };
672
673 static const struct net_device_ops ieee80211_monitorif_ops = {
674         .ndo_open               = ieee80211_open,
675         .ndo_stop               = ieee80211_stop,
676         .ndo_uninit             = ieee80211_teardown_sdata,
677         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
678         .ndo_set_multicast_list = ieee80211_set_multicast_list,
679         .ndo_change_mtu         = ieee80211_change_mtu,
680         .ndo_set_mac_address    = eth_mac_addr,
681 };
682
683 static void ieee80211_if_setup(struct net_device *dev)
684 {
685         ether_setup(dev);
686         dev->netdev_ops = &ieee80211_dataif_ops;
687         dev->destructor = free_netdev;
688 }
689
690 /*
691  * Helper function to initialise an interface to a specific type.
692  */
693 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
694                                   enum nl80211_iftype type)
695 {
696         /* clear type-dependent union */
697         memset(&sdata->u, 0, sizeof(sdata->u));
698
699         /* and set some type-dependent values */
700         sdata->vif.type = type;
701         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
702         sdata->wdev.iftype = type;
703
704         /* only monitor differs */
705         sdata->dev->type = ARPHRD_ETHER;
706
707         switch (type) {
708         case NL80211_IFTYPE_AP:
709                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
710                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
711                 break;
712         case NL80211_IFTYPE_STATION:
713                 ieee80211_sta_setup_sdata(sdata);
714                 break;
715         case NL80211_IFTYPE_ADHOC:
716                 ieee80211_ibss_setup_sdata(sdata);
717                 break;
718         case NL80211_IFTYPE_MESH_POINT:
719                 if (ieee80211_vif_is_mesh(&sdata->vif))
720                         ieee80211_mesh_init_sdata(sdata);
721                 break;
722         case NL80211_IFTYPE_MONITOR:
723                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
724                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
725                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
726                                       MONITOR_FLAG_OTHER_BSS;
727                 break;
728         case NL80211_IFTYPE_WDS:
729         case NL80211_IFTYPE_AP_VLAN:
730                 break;
731         case NL80211_IFTYPE_UNSPECIFIED:
732         case __NL80211_IFTYPE_AFTER_LAST:
733                 BUG();
734                 break;
735         }
736
737         ieee80211_debugfs_add_netdev(sdata);
738 }
739
740 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
741                              enum nl80211_iftype type)
742 {
743         ASSERT_RTNL();
744
745         if (type == sdata->vif.type)
746                 return 0;
747
748         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
749         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
750             type == NL80211_IFTYPE_ADHOC)
751                 return -EOPNOTSUPP;
752
753         /*
754          * We could, here, on changes between IBSS/STA/MESH modes,
755          * invoke an MLME function instead that disassociates etc.
756          * and goes into the requested mode.
757          */
758
759         if (ieee80211_sdata_running(sdata))
760                 return -EBUSY;
761
762         /* Purge and reset type-dependent state. */
763         ieee80211_teardown_sdata(sdata->dev);
764         ieee80211_setup_sdata(sdata, type);
765
766         /* reset some values that shouldn't be kept across type changes */
767         sdata->vif.bss_conf.basic_rates =
768                 ieee80211_mandatory_rates(sdata->local,
769                         sdata->local->hw.conf.channel->band);
770         sdata->drop_unencrypted = 0;
771         if (type == NL80211_IFTYPE_STATION)
772                 sdata->u.mgd.use_4addr = false;
773
774         return 0;
775 }
776
777 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
778                      struct net_device **new_dev, enum nl80211_iftype type,
779                      struct vif_params *params)
780 {
781         struct net_device *ndev;
782         struct ieee80211_sub_if_data *sdata = NULL;
783         int ret, i;
784
785         ASSERT_RTNL();
786
787         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
788                             name, ieee80211_if_setup);
789         if (!ndev)
790                 return -ENOMEM;
791         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
792
793         ndev->needed_headroom = local->tx_headroom +
794                                 4*6 /* four MAC addresses */
795                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
796                                 + 6 /* mesh */
797                                 + 8 /* rfc1042/bridge tunnel */
798                                 - ETH_HLEN /* ethernet hard_header_len */
799                                 + IEEE80211_ENCRYPT_HEADROOM;
800         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
801
802         ret = dev_alloc_name(ndev, ndev->name);
803         if (ret < 0)
804                 goto fail;
805
806         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
807         memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
808         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
809
810         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
811         sdata = netdev_priv(ndev);
812         ndev->ieee80211_ptr = &sdata->wdev;
813         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
814         memcpy(sdata->name, ndev->name, IFNAMSIZ);
815
816         /* initialise type-independent data */
817         sdata->wdev.wiphy = local->hw.wiphy;
818         sdata->local = local;
819         sdata->dev = ndev;
820
821         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
822                 skb_queue_head_init(&sdata->fragments[i].skb_list);
823
824         INIT_LIST_HEAD(&sdata->key_list);
825
826         sdata->force_unicast_rateidx = -1;
827         sdata->max_ratectrl_rateidx = -1;
828
829         /* setup type-dependent data */
830         ieee80211_setup_sdata(sdata, type);
831
832         if (params) {
833                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
834                 if (type == NL80211_IFTYPE_STATION)
835                         sdata->u.mgd.use_4addr = params->use_4addr;
836         }
837
838         ret = register_netdevice(ndev);
839         if (ret)
840                 goto fail;
841
842         if (ieee80211_vif_is_mesh(&sdata->vif) &&
843             params && params->mesh_id_len)
844                 ieee80211_sdata_set_mesh_id(sdata,
845                                             params->mesh_id_len,
846                                             params->mesh_id);
847
848         mutex_lock(&local->iflist_mtx);
849         list_add_tail_rcu(&sdata->list, &local->interfaces);
850         mutex_unlock(&local->iflist_mtx);
851
852         if (new_dev)
853                 *new_dev = ndev;
854
855         return 0;
856
857  fail:
858         free_netdev(ndev);
859         return ret;
860 }
861
862 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
863 {
864         ASSERT_RTNL();
865
866         mutex_lock(&sdata->local->iflist_mtx);
867         list_del_rcu(&sdata->list);
868         mutex_unlock(&sdata->local->iflist_mtx);
869
870         synchronize_rcu();
871         unregister_netdevice(sdata->dev);
872 }
873
874 /*
875  * Remove all interfaces, may only be called at hardware unregistration
876  * time because it doesn't do RCU-safe list removals.
877  */
878 void ieee80211_remove_interfaces(struct ieee80211_local *local)
879 {
880         struct ieee80211_sub_if_data *sdata, *tmp;
881         LIST_HEAD(unreg_list);
882
883         ASSERT_RTNL();
884
885         mutex_lock(&local->iflist_mtx);
886         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
887                 list_del(&sdata->list);
888
889                 unregister_netdevice_queue(sdata->dev, &unreg_list);
890         }
891         mutex_unlock(&local->iflist_mtx);
892         unregister_netdevice_many(&unreg_list);
893 }
894
895 static u32 ieee80211_idle_off(struct ieee80211_local *local,
896                               const char *reason)
897 {
898         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
899                 return 0;
900
901 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
902         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
903                wiphy_name(local->hw.wiphy), reason);
904 #endif
905
906         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
907         return IEEE80211_CONF_CHANGE_IDLE;
908 }
909
910 static u32 ieee80211_idle_on(struct ieee80211_local *local)
911 {
912         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
913                 return 0;
914
915 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
916         printk(KERN_DEBUG "%s: device now idle\n",
917                wiphy_name(local->hw.wiphy));
918 #endif
919
920         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
921         return IEEE80211_CONF_CHANGE_IDLE;
922 }
923
924 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
925 {
926         struct ieee80211_sub_if_data *sdata;
927         int count = 0;
928
929         if (local->scanning)
930                 return ieee80211_idle_off(local, "scanning");
931
932         list_for_each_entry(sdata, &local->interfaces, list) {
933                 if (!ieee80211_sdata_running(sdata))
934                         continue;
935                 /* do not count disabled managed interfaces */
936                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
937                     !sdata->u.mgd.associated &&
938                     list_empty(&sdata->u.mgd.work_list))
939                         continue;
940                 /* do not count unused IBSS interfaces */
941                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
942                     !sdata->u.ibss.ssid_len)
943                         continue;
944                 /* count everything else */
945                 count++;
946         }
947
948         if (!count)
949                 return ieee80211_idle_on(local);
950         else
951                 return ieee80211_idle_off(local, "in use");
952
953         return 0;
954 }
955
956 void ieee80211_recalc_idle(struct ieee80211_local *local)
957 {
958         u32 chg;
959
960         mutex_lock(&local->iflist_mtx);
961         chg = __ieee80211_recalc_idle(local);
962         mutex_unlock(&local->iflist_mtx);
963         if (chg)
964                 ieee80211_hw_config(local, chg);
965 }
966
967 static int netdev_notify(struct notifier_block *nb,
968                          unsigned long state,
969                          void *ndev)
970 {
971         struct net_device *dev = ndev;
972         struct ieee80211_sub_if_data *sdata;
973
974         if (state != NETDEV_CHANGENAME)
975                 return 0;
976
977         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
978                 return 0;
979
980         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
981                 return 0;
982
983         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
984
985         memcpy(sdata->name, sdata->name, IFNAMSIZ);
986
987         ieee80211_debugfs_rename_netdev(sdata);
988         return 0;
989 }
990
991 static struct notifier_block mac80211_netdev_notifier = {
992         .notifier_call = netdev_notify,
993 };
994
995 int ieee80211_iface_init(void)
996 {
997         return register_netdevice_notifier(&mac80211_netdev_notifier);
998 }
999
1000 void ieee80211_iface_exit(void)
1001 {
1002         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1003 }