mac80211: add p2p device type support
[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/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27
28 /**
29  * DOC: Interface list locking
30  *
31  * The interface list in each struct ieee80211_local is protected
32  * three-fold:
33  *
34  * (1) modifications may only be done under the RTNL
35  * (2) modifications and readers are protected against each other by
36  *     the iflist_mtx.
37  * (3) modifications are done in an RCU manner so atomic readers
38  *     can traverse the list in RCU-safe blocks.
39  *
40  * As a consequence, reads (traversals) of the list can be protected
41  * by either the RTNL, the iflist_mtx or RCU.
42  */
43
44
45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
46 {
47         int meshhdrlen;
48         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
49
50         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
51
52         /* FIX: what would be proper limits for MTU?
53          * This interface uses 802.3 frames. */
54         if (new_mtu < 256 ||
55             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
56                 return -EINVAL;
57         }
58
59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
60         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
62         dev->mtu = new_mtu;
63         return 0;
64 }
65
66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
67 {
68         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
69         struct sockaddr *sa = addr;
70         int ret;
71
72         if (ieee80211_sdata_running(sdata))
73                 return -EBUSY;
74
75         ret = eth_mac_addr(dev, sa);
76
77         if (ret == 0)
78                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
79
80         return ret;
81 }
82
83 static inline int identical_mac_addr_allowed(int type1, int type2)
84 {
85         return type1 == NL80211_IFTYPE_MONITOR ||
86                 type2 == NL80211_IFTYPE_MONITOR ||
87                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
88                 (type1 == NL80211_IFTYPE_WDS &&
89                         (type2 == NL80211_IFTYPE_WDS ||
90                          type2 == NL80211_IFTYPE_AP)) ||
91                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
92                 (type1 == NL80211_IFTYPE_AP_VLAN &&
93                         (type2 == NL80211_IFTYPE_AP ||
94                          type2 == NL80211_IFTYPE_AP_VLAN));
95 }
96
97 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
98                                             enum nl80211_iftype iftype)
99 {
100         struct ieee80211_local *local = sdata->local;
101         struct ieee80211_sub_if_data *nsdata;
102         struct net_device *dev = sdata->dev;
103
104         ASSERT_RTNL();
105
106         /* we hold the RTNL here so can safely walk the list */
107         list_for_each_entry(nsdata, &local->interfaces, list) {
108                 struct net_device *ndev = nsdata->dev;
109
110                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
111                         /*
112                          * Allow only a single IBSS interface to be up at any
113                          * time. This is restricted because beacon distribution
114                          * cannot work properly if both are in the same IBSS.
115                          *
116                          * To remove this restriction we'd have to disallow them
117                          * from setting the same SSID on different IBSS interfaces
118                          * belonging to the same hardware. Then, however, we're
119                          * faced with having to adopt two different TSF timers...
120                          */
121                         if (iftype == NL80211_IFTYPE_ADHOC &&
122                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
123                                 return -EBUSY;
124
125                         /*
126                          * The remaining checks are only performed for interfaces
127                          * with the same MAC address.
128                          */
129                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
130                                 continue;
131
132                         /*
133                          * check whether it may have the same address
134                          */
135                         if (!identical_mac_addr_allowed(iftype,
136                                                         nsdata->vif.type))
137                                 return -ENOTUNIQ;
138
139                         /*
140                          * can only add VLANs to enabled APs
141                          */
142                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
143                             nsdata->vif.type == NL80211_IFTYPE_AP)
144                                 sdata->bss = &nsdata->u.ap;
145                 }
146         }
147
148         return 0;
149 }
150
151 /*
152  * NOTE: Be very careful when changing this function, it must NOT return
153  * an error on interface type changes that have been pre-checked, so most
154  * checks should be in ieee80211_check_concurrent_iface.
155  */
156 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
157 {
158         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
159         struct ieee80211_local *local = sdata->local;
160         struct sta_info *sta;
161         u32 changed = 0;
162         int res;
163         u32 hw_reconf_flags = 0;
164
165         switch (sdata->vif.type) {
166         case NL80211_IFTYPE_WDS:
167                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
168                         return -ENOLINK;
169                 break;
170         case NL80211_IFTYPE_AP_VLAN:
171                 if (!sdata->bss)
172                         return -ENOLINK;
173                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
174                 break;
175         case NL80211_IFTYPE_AP:
176                 sdata->bss = &sdata->u.ap;
177                 break;
178         case NL80211_IFTYPE_MESH_POINT:
179                 if (!ieee80211_vif_is_mesh(&sdata->vif))
180                         break;
181                 /* mesh ifaces must set allmulti to forward mcast traffic */
182                 atomic_inc(&local->iff_allmultis);
183                 break;
184         case NL80211_IFTYPE_STATION:
185         case NL80211_IFTYPE_MONITOR:
186         case NL80211_IFTYPE_ADHOC:
187                 /* no special treatment */
188                 break;
189         case NL80211_IFTYPE_UNSPECIFIED:
190         case NUM_NL80211_IFTYPES:
191         case NL80211_IFTYPE_P2P_CLIENT:
192         case NL80211_IFTYPE_P2P_GO:
193                 /* cannot happen */
194                 WARN_ON(1);
195                 break;
196         }
197
198         if (local->open_count == 0) {
199                 res = drv_start(local);
200                 if (res)
201                         goto err_del_bss;
202                 if (local->ops->napi_poll)
203                         napi_enable(&local->napi);
204                 /* we're brought up, everything changes */
205                 hw_reconf_flags = ~0;
206                 ieee80211_led_radio(local, true);
207         }
208
209         /*
210          * Copy the hopefully now-present MAC address to
211          * this interface, if it has the special null one.
212          */
213         if (is_zero_ether_addr(dev->dev_addr)) {
214                 memcpy(dev->dev_addr,
215                        local->hw.wiphy->perm_addr,
216                        ETH_ALEN);
217                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
218
219                 if (!is_valid_ether_addr(dev->dev_addr)) {
220                         if (!local->open_count)
221                                 drv_stop(local);
222                         return -EADDRNOTAVAIL;
223                 }
224         }
225
226         switch (sdata->vif.type) {
227         case NL80211_IFTYPE_AP_VLAN:
228                 /* no need to tell driver */
229                 break;
230         case NL80211_IFTYPE_MONITOR:
231                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
232                         local->cooked_mntrs++;
233                         break;
234                 }
235
236                 /* must be before the call to ieee80211_configure_filter */
237                 local->monitors++;
238                 if (local->monitors == 1) {
239                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
240                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
241                 }
242
243                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
244                         local->fif_fcsfail++;
245                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
246                         local->fif_plcpfail++;
247                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
248                         local->fif_control++;
249                         local->fif_pspoll++;
250                 }
251                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
252                         local->fif_other_bss++;
253
254                 ieee80211_configure_filter(local);
255
256                 netif_carrier_on(dev);
257                 break;
258         default:
259                 if (coming_up) {
260                         res = drv_add_interface(local, &sdata->vif);
261                         if (res)
262                                 goto err_stop;
263                 }
264
265                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
266                         local->fif_other_bss++;
267                         ieee80211_configure_filter(local);
268
269                         ieee80211_start_mesh(sdata);
270                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
271                         local->fif_pspoll++;
272
273                         ieee80211_configure_filter(local);
274                 }
275
276                 changed |= ieee80211_reset_erp_info(sdata);
277                 ieee80211_bss_info_change_notify(sdata, changed);
278
279                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
280                         netif_carrier_off(dev);
281                 else
282                         netif_carrier_on(dev);
283         }
284
285         set_bit(SDATA_STATE_RUNNING, &sdata->state);
286
287         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
288                 /* Create STA entry for the WDS peer */
289                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
290                                      GFP_KERNEL);
291                 if (!sta) {
292                         res = -ENOMEM;
293                         goto err_del_interface;
294                 }
295
296                 /* no locking required since STA is not live yet */
297                 sta->flags |= WLAN_STA_AUTHORIZED;
298
299                 res = sta_info_insert(sta);
300                 if (res) {
301                         /* STA has been freed */
302                         goto err_del_interface;
303                 }
304         }
305
306         /*
307          * set_multicast_list will be invoked by the networking core
308          * which will check whether any increments here were done in
309          * error and sync them down to the hardware as filter flags.
310          */
311         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
312                 atomic_inc(&local->iff_allmultis);
313
314         if (sdata->flags & IEEE80211_SDATA_PROMISC)
315                 atomic_inc(&local->iff_promiscs);
316
317         mutex_lock(&local->mtx);
318         hw_reconf_flags |= __ieee80211_recalc_idle(local);
319         mutex_unlock(&local->mtx);
320
321         if (coming_up)
322                 local->open_count++;
323
324         if (hw_reconf_flags) {
325                 ieee80211_hw_config(local, hw_reconf_flags);
326                 /*
327                  * set default queue parameters so drivers don't
328                  * need to initialise the hardware if the hardware
329                  * doesn't start up with sane defaults
330                  */
331                 ieee80211_set_wmm_default(sdata);
332         }
333
334         ieee80211_recalc_ps(local, -1);
335
336         netif_tx_start_all_queues(dev);
337
338         return 0;
339  err_del_interface:
340         drv_remove_interface(local, &sdata->vif);
341  err_stop:
342         if (!local->open_count)
343                 drv_stop(local);
344  err_del_bss:
345         sdata->bss = NULL;
346         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
347                 list_del(&sdata->u.vlan.list);
348         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
349         return res;
350 }
351
352 static int ieee80211_open(struct net_device *dev)
353 {
354         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
355         int err;
356
357         /* fail early if user set an invalid address */
358         if (!is_zero_ether_addr(dev->dev_addr) &&
359             !is_valid_ether_addr(dev->dev_addr))
360                 return -EADDRNOTAVAIL;
361
362         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
363         if (err)
364                 return err;
365
366         return ieee80211_do_open(dev, true);
367 }
368
369 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
370                               bool going_down)
371 {
372         struct ieee80211_local *local = sdata->local;
373         unsigned long flags;
374         struct sk_buff *skb, *tmp;
375         u32 hw_reconf_flags = 0;
376         int i;
377
378         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
379
380         /*
381          * Stop TX on this interface first.
382          */
383         netif_tx_stop_all_queues(sdata->dev);
384
385         /*
386          * Purge work for this interface.
387          */
388         ieee80211_work_purge(sdata);
389
390         /*
391          * Remove all stations associated with this interface.
392          *
393          * This must be done before calling ops->remove_interface()
394          * because otherwise we can later invoke ops->sta_notify()
395          * whenever the STAs are removed, and that invalidates driver
396          * assumptions about always getting a vif pointer that is valid
397          * (because if we remove a STA after ops->remove_interface()
398          * the driver will have removed the vif info already!)
399          *
400          * This is relevant only in AP, WDS and mesh modes, since in
401          * all other modes we've already removed all stations when
402          * disconnecting etc.
403          */
404         sta_info_flush(local, sdata);
405
406         /*
407          * Don't count this interface for promisc/allmulti while it
408          * is down. dev_mc_unsync() will invoke set_multicast_list
409          * on the master interface which will sync these down to the
410          * hardware as filter flags.
411          */
412         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
413                 atomic_dec(&local->iff_allmultis);
414
415         if (sdata->flags & IEEE80211_SDATA_PROMISC)
416                 atomic_dec(&local->iff_promiscs);
417
418         if (sdata->vif.type == NL80211_IFTYPE_AP)
419                 local->fif_pspoll--;
420
421         netif_addr_lock_bh(sdata->dev);
422         spin_lock_bh(&local->filter_lock);
423         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
424                          sdata->dev->addr_len);
425         spin_unlock_bh(&local->filter_lock);
426         netif_addr_unlock_bh(sdata->dev);
427
428         ieee80211_configure_filter(local);
429
430         del_timer_sync(&local->dynamic_ps_timer);
431         cancel_work_sync(&local->dynamic_ps_enable_work);
432
433         /* APs need special treatment */
434         if (sdata->vif.type == NL80211_IFTYPE_AP) {
435                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
436                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
437
438                 /* sdata_running will return false, so this will disable */
439                 ieee80211_bss_info_change_notify(sdata,
440                                                  BSS_CHANGED_BEACON_ENABLED);
441
442                 /* remove beacon */
443                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
444                 synchronize_rcu();
445                 kfree(old_beacon);
446
447                 /* free all potentially still buffered bcast frames */
448                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
449                         local->total_ps_buffered--;
450                         dev_kfree_skb(skb);
451                 }
452
453                 /* down all dependent devices, that is VLANs */
454                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
455                                          u.vlan.list)
456                         dev_close(vlan->dev);
457                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
458         }
459
460         if (going_down)
461                 local->open_count--;
462
463         switch (sdata->vif.type) {
464         case NL80211_IFTYPE_AP_VLAN:
465                 list_del(&sdata->u.vlan.list);
466                 /* no need to tell driver */
467                 break;
468         case NL80211_IFTYPE_MONITOR:
469                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
470                         local->cooked_mntrs--;
471                         break;
472                 }
473
474                 local->monitors--;
475                 if (local->monitors == 0) {
476                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
477                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
478                 }
479
480                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
481                         local->fif_fcsfail--;
482                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
483                         local->fif_plcpfail--;
484                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
485                         local->fif_pspoll--;
486                         local->fif_control--;
487                 }
488                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
489                         local->fif_other_bss--;
490
491                 ieee80211_configure_filter(local);
492                 break;
493         case NL80211_IFTYPE_MESH_POINT:
494                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
495                         /* other_bss and allmulti are always set on mesh
496                          * ifaces */
497                         local->fif_other_bss--;
498                         atomic_dec(&local->iff_allmultis);
499
500                         ieee80211_configure_filter(local);
501
502                         ieee80211_stop_mesh(sdata);
503                 }
504                 /* fall through */
505         default:
506                 flush_work(&sdata->work);
507                 /*
508                  * When we get here, the interface is marked down.
509                  * Call synchronize_rcu() to wait for the RX path
510                  * should it be using the interface and enqueuing
511                  * frames at this very time on another CPU.
512                  */
513                 synchronize_rcu();
514                 skb_queue_purge(&sdata->skb_queue);
515
516                 if (local->scan_sdata == sdata)
517                         ieee80211_scan_cancel(local);
518
519                 /*
520                  * Disable beaconing here for mesh only, AP and IBSS
521                  * are already taken care of.
522                  */
523                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
524                         ieee80211_bss_info_change_notify(sdata,
525                                 BSS_CHANGED_BEACON_ENABLED);
526
527                 /*
528                  * Free all remaining keys, there shouldn't be any,
529                  * except maybe group keys in AP more or WDS?
530                  */
531                 ieee80211_free_keys(sdata);
532
533                 if (going_down)
534                         drv_remove_interface(local, &sdata->vif);
535         }
536
537         sdata->bss = NULL;
538
539         mutex_lock(&local->mtx);
540         hw_reconf_flags |= __ieee80211_recalc_idle(local);
541         mutex_unlock(&local->mtx);
542
543         ieee80211_recalc_ps(local, -1);
544
545         if (local->open_count == 0) {
546                 if (local->ops->napi_poll)
547                         napi_disable(&local->napi);
548                 ieee80211_clear_tx_pending(local);
549                 ieee80211_stop_device(local);
550
551                 /* no reconfiguring after stop! */
552                 hw_reconf_flags = 0;
553         }
554
555         /* do after stop to avoid reconfiguring when we stop anyway */
556         if (hw_reconf_flags)
557                 ieee80211_hw_config(local, hw_reconf_flags);
558
559         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
560         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
561                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
562                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
563                         if (info->control.vif == &sdata->vif) {
564                                 __skb_unlink(skb, &local->pending[i]);
565                                 dev_kfree_skb_irq(skb);
566                         }
567                 }
568         }
569         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
570 }
571
572 static int ieee80211_stop(struct net_device *dev)
573 {
574         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
575
576         ieee80211_do_stop(sdata, true);
577
578         return 0;
579 }
580
581 static void ieee80211_set_multicast_list(struct net_device *dev)
582 {
583         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
584         struct ieee80211_local *local = sdata->local;
585         int allmulti, promisc, sdata_allmulti, sdata_promisc;
586
587         allmulti = !!(dev->flags & IFF_ALLMULTI);
588         promisc = !!(dev->flags & IFF_PROMISC);
589         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
590         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
591
592         if (allmulti != sdata_allmulti) {
593                 if (dev->flags & IFF_ALLMULTI)
594                         atomic_inc(&local->iff_allmultis);
595                 else
596                         atomic_dec(&local->iff_allmultis);
597                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
598         }
599
600         if (promisc != sdata_promisc) {
601                 if (dev->flags & IFF_PROMISC)
602                         atomic_inc(&local->iff_promiscs);
603                 else
604                         atomic_dec(&local->iff_promiscs);
605                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
606         }
607         spin_lock_bh(&local->filter_lock);
608         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
609         spin_unlock_bh(&local->filter_lock);
610         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
611 }
612
613 /*
614  * Called when the netdev is removed or, by the code below, before
615  * the interface type changes.
616  */
617 static void ieee80211_teardown_sdata(struct net_device *dev)
618 {
619         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
620         struct ieee80211_local *local = sdata->local;
621         int flushed;
622         int i;
623
624         /* free extra data */
625         ieee80211_free_keys(sdata);
626
627         ieee80211_debugfs_remove_netdev(sdata);
628
629         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
630                 __skb_queue_purge(&sdata->fragments[i].skb_list);
631         sdata->fragment_next = 0;
632
633         if (ieee80211_vif_is_mesh(&sdata->vif))
634                 mesh_rmc_free(sdata);
635
636         flushed = sta_info_flush(local, sdata);
637         WARN_ON(flushed);
638 }
639
640 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
641                                          struct sk_buff *skb)
642 {
643         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
644 }
645
646 static const struct net_device_ops ieee80211_dataif_ops = {
647         .ndo_open               = ieee80211_open,
648         .ndo_stop               = ieee80211_stop,
649         .ndo_uninit             = ieee80211_teardown_sdata,
650         .ndo_start_xmit         = ieee80211_subif_start_xmit,
651         .ndo_set_multicast_list = ieee80211_set_multicast_list,
652         .ndo_change_mtu         = ieee80211_change_mtu,
653         .ndo_set_mac_address    = ieee80211_change_mac,
654         .ndo_select_queue       = ieee80211_netdev_select_queue,
655 };
656
657 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
658                                           struct sk_buff *skb)
659 {
660         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
661         struct ieee80211_local *local = sdata->local;
662         struct ieee80211_hdr *hdr;
663         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
664         u8 *p;
665
666         if (local->hw.queues < 4)
667                 return 0;
668
669         if (skb->len < 4 ||
670             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
671                 return 0; /* doesn't matter, frame will be dropped */
672
673         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
674
675         if (!ieee80211_is_data(hdr->frame_control)) {
676                 skb->priority = 7;
677                 return ieee802_1d_to_ac[skb->priority];
678         }
679         if (!ieee80211_is_data_qos(hdr->frame_control)) {
680                 skb->priority = 0;
681                 return ieee802_1d_to_ac[skb->priority];
682         }
683
684         p = ieee80211_get_qos_ctl(hdr);
685         skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
686
687         return ieee80211_downgrade_queue(local, skb);
688 }
689
690 static const struct net_device_ops ieee80211_monitorif_ops = {
691         .ndo_open               = ieee80211_open,
692         .ndo_stop               = ieee80211_stop,
693         .ndo_uninit             = ieee80211_teardown_sdata,
694         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
695         .ndo_set_multicast_list = ieee80211_set_multicast_list,
696         .ndo_change_mtu         = ieee80211_change_mtu,
697         .ndo_set_mac_address    = eth_mac_addr,
698         .ndo_select_queue       = ieee80211_monitor_select_queue,
699 };
700
701 static void ieee80211_if_setup(struct net_device *dev)
702 {
703         ether_setup(dev);
704         dev->netdev_ops = &ieee80211_dataif_ops;
705         dev->destructor = free_netdev;
706 }
707
708 static void ieee80211_iface_work(struct work_struct *work)
709 {
710         struct ieee80211_sub_if_data *sdata =
711                 container_of(work, struct ieee80211_sub_if_data, work);
712         struct ieee80211_local *local = sdata->local;
713         struct sk_buff *skb;
714         struct sta_info *sta;
715         struct ieee80211_ra_tid *ra_tid;
716
717         if (!ieee80211_sdata_running(sdata))
718                 return;
719
720         if (local->scanning)
721                 return;
722
723         /*
724          * ieee80211_queue_work() should have picked up most cases,
725          * here we'll pick the rest.
726          */
727         if (WARN(local->suspended,
728                  "interface work scheduled while going to suspend\n"))
729                 return;
730
731         /* first process frames */
732         while ((skb = skb_dequeue(&sdata->skb_queue))) {
733                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
734
735                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
736                         ra_tid = (void *)&skb->cb;
737                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
738                                                  ra_tid->tid);
739                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
740                         ra_tid = (void *)&skb->cb;
741                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
742                                                 ra_tid->tid);
743                 } else if (ieee80211_is_action(mgmt->frame_control) &&
744                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
745                         int len = skb->len;
746
747                         mutex_lock(&local->sta_mtx);
748                         sta = sta_info_get_bss(sdata, mgmt->sa);
749                         if (sta) {
750                                 switch (mgmt->u.action.u.addba_req.action_code) {
751                                 case WLAN_ACTION_ADDBA_REQ:
752                                         ieee80211_process_addba_request(
753                                                         local, sta, mgmt, len);
754                                         break;
755                                 case WLAN_ACTION_ADDBA_RESP:
756                                         ieee80211_process_addba_resp(local, sta,
757                                                                      mgmt, len);
758                                         break;
759                                 case WLAN_ACTION_DELBA:
760                                         ieee80211_process_delba(sdata, sta,
761                                                                 mgmt, len);
762                                         break;
763                                 default:
764                                         WARN_ON(1);
765                                         break;
766                                 }
767                         }
768                         mutex_unlock(&local->sta_mtx);
769                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
770                         struct ieee80211_hdr *hdr = (void *)mgmt;
771                         /*
772                          * So the frame isn't mgmt, but frame_control
773                          * is at the right place anyway, of course, so
774                          * the if statement is correct.
775                          *
776                          * Warn if we have other data frame types here,
777                          * they must not get here.
778                          */
779                         WARN_ON(hdr->frame_control &
780                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
781                         WARN_ON(!(hdr->seq_ctrl &
782                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
783                         /*
784                          * This was a fragment of a frame, received while
785                          * a block-ack session was active. That cannot be
786                          * right, so terminate the session.
787                          */
788                         mutex_lock(&local->sta_mtx);
789                         sta = sta_info_get_bss(sdata, mgmt->sa);
790                         if (sta) {
791                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
792                                                 IEEE80211_QOS_CTL_TID_MASK;
793
794                                 __ieee80211_stop_rx_ba_session(
795                                         sta, tid, WLAN_BACK_RECIPIENT,
796                                         WLAN_REASON_QSTA_REQUIRE_SETUP);
797                         }
798                         mutex_unlock(&local->sta_mtx);
799                 } else switch (sdata->vif.type) {
800                 case NL80211_IFTYPE_STATION:
801                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
802                         break;
803                 case NL80211_IFTYPE_ADHOC:
804                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
805                         break;
806                 case NL80211_IFTYPE_MESH_POINT:
807                         if (!ieee80211_vif_is_mesh(&sdata->vif))
808                                 break;
809                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
810                         break;
811                 default:
812                         WARN(1, "frame for unexpected interface type");
813                         break;
814                 }
815
816                 kfree_skb(skb);
817         }
818
819         /* then other type-dependent work */
820         switch (sdata->vif.type) {
821         case NL80211_IFTYPE_STATION:
822                 ieee80211_sta_work(sdata);
823                 break;
824         case NL80211_IFTYPE_ADHOC:
825                 ieee80211_ibss_work(sdata);
826                 break;
827         case NL80211_IFTYPE_MESH_POINT:
828                 if (!ieee80211_vif_is_mesh(&sdata->vif))
829                         break;
830                 ieee80211_mesh_work(sdata);
831                 break;
832         default:
833                 break;
834         }
835 }
836
837
838 /*
839  * Helper function to initialise an interface to a specific type.
840  */
841 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
842                                   enum nl80211_iftype type)
843 {
844         /* clear type-dependent union */
845         memset(&sdata->u, 0, sizeof(sdata->u));
846
847         /* and set some type-dependent values */
848         sdata->vif.type = type;
849         sdata->vif.p2p = false;
850         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
851         sdata->wdev.iftype = type;
852
853         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
854         sdata->control_port_no_encrypt = false;
855
856         /* only monitor differs */
857         sdata->dev->type = ARPHRD_ETHER;
858
859         skb_queue_head_init(&sdata->skb_queue);
860         INIT_WORK(&sdata->work, ieee80211_iface_work);
861
862         switch (type) {
863         case NL80211_IFTYPE_P2P_GO:
864                 type = NL80211_IFTYPE_AP;
865                 sdata->vif.type = type;
866                 sdata->vif.p2p = true;
867                 /* fall through */
868         case NL80211_IFTYPE_AP:
869                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
870                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
871                 break;
872         case NL80211_IFTYPE_P2P_CLIENT:
873                 type = NL80211_IFTYPE_STATION;
874                 sdata->vif.type = type;
875                 sdata->vif.p2p = true;
876                 /* fall through */
877         case NL80211_IFTYPE_STATION:
878                 ieee80211_sta_setup_sdata(sdata);
879                 break;
880         case NL80211_IFTYPE_ADHOC:
881                 ieee80211_ibss_setup_sdata(sdata);
882                 break;
883         case NL80211_IFTYPE_MESH_POINT:
884                 if (ieee80211_vif_is_mesh(&sdata->vif))
885                         ieee80211_mesh_init_sdata(sdata);
886                 break;
887         case NL80211_IFTYPE_MONITOR:
888                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
889                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
890                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
891                                       MONITOR_FLAG_OTHER_BSS;
892                 break;
893         case NL80211_IFTYPE_WDS:
894         case NL80211_IFTYPE_AP_VLAN:
895                 break;
896         case NL80211_IFTYPE_UNSPECIFIED:
897         case NUM_NL80211_IFTYPES:
898                 BUG();
899                 break;
900         }
901
902         ieee80211_debugfs_add_netdev(sdata);
903 }
904
905 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
906                                            enum nl80211_iftype type)
907 {
908         struct ieee80211_local *local = sdata->local;
909         int ret, err;
910         enum nl80211_iftype internal_type = type;
911         bool p2p = false;
912
913         ASSERT_RTNL();
914
915         if (!local->ops->change_interface)
916                 return -EBUSY;
917
918         switch (sdata->vif.type) {
919         case NL80211_IFTYPE_AP:
920         case NL80211_IFTYPE_STATION:
921         case NL80211_IFTYPE_ADHOC:
922                 /*
923                  * Could maybe also all others here?
924                  * Just not sure how that interacts
925                  * with the RX/config path e.g. for
926                  * mesh.
927                  */
928                 break;
929         default:
930                 return -EBUSY;
931         }
932
933         switch (type) {
934         case NL80211_IFTYPE_AP:
935         case NL80211_IFTYPE_STATION:
936         case NL80211_IFTYPE_ADHOC:
937                 /*
938                  * Could probably support everything
939                  * but WDS here (WDS do_open can fail
940                  * under memory pressure, which this
941                  * code isn't prepared to handle).
942                  */
943                 break;
944         case NL80211_IFTYPE_P2P_CLIENT:
945                 p2p = true;
946                 internal_type = NL80211_IFTYPE_STATION;
947                 break;
948         case NL80211_IFTYPE_P2P_GO:
949                 p2p = true;
950                 internal_type = NL80211_IFTYPE_AP;
951                 break;
952         default:
953                 return -EBUSY;
954         }
955
956         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
957         if (ret)
958                 return ret;
959
960         ieee80211_do_stop(sdata, false);
961
962         ieee80211_teardown_sdata(sdata->dev);
963
964         ret = drv_change_interface(local, sdata, internal_type, p2p);
965         if (ret)
966                 type = sdata->vif.type;
967
968         ieee80211_setup_sdata(sdata, type);
969
970         err = ieee80211_do_open(sdata->dev, false);
971         WARN(err, "type change: do_open returned %d", err);
972
973         return ret;
974 }
975
976 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
977                              enum nl80211_iftype type)
978 {
979         int ret;
980
981         ASSERT_RTNL();
982
983         if (type == ieee80211_vif_type_p2p(&sdata->vif))
984                 return 0;
985
986         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
987         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
988             type == NL80211_IFTYPE_ADHOC)
989                 return -EOPNOTSUPP;
990
991         if (ieee80211_sdata_running(sdata)) {
992                 ret = ieee80211_runtime_change_iftype(sdata, type);
993                 if (ret)
994                         return ret;
995         } else {
996                 /* Purge and reset type-dependent state. */
997                 ieee80211_teardown_sdata(sdata->dev);
998                 ieee80211_setup_sdata(sdata, type);
999         }
1000
1001         /* reset some values that shouldn't be kept across type changes */
1002         sdata->vif.bss_conf.basic_rates =
1003                 ieee80211_mandatory_rates(sdata->local,
1004                         sdata->local->hw.conf.channel->band);
1005         sdata->drop_unencrypted = 0;
1006         if (type == NL80211_IFTYPE_STATION)
1007                 sdata->u.mgd.use_4addr = false;
1008
1009         return 0;
1010 }
1011
1012 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1013                                        struct net_device *dev,
1014                                        enum nl80211_iftype type)
1015 {
1016         struct ieee80211_sub_if_data *sdata;
1017         u64 mask, start, addr, val, inc;
1018         u8 *m;
1019         u8 tmp_addr[ETH_ALEN];
1020         int i;
1021
1022         /* default ... something at least */
1023         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1024
1025         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1026             local->hw.wiphy->n_addresses <= 1)
1027                 return;
1028
1029
1030         mutex_lock(&local->iflist_mtx);
1031
1032         switch (type) {
1033         case NL80211_IFTYPE_MONITOR:
1034                 /* doesn't matter */
1035                 break;
1036         case NL80211_IFTYPE_WDS:
1037         case NL80211_IFTYPE_AP_VLAN:
1038                 /* match up with an AP interface */
1039                 list_for_each_entry(sdata, &local->interfaces, list) {
1040                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1041                                 continue;
1042                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1043                         break;
1044                 }
1045                 /* keep default if no AP interface present */
1046                 break;
1047         default:
1048                 /* assign a new address if possible -- try n_addresses first */
1049                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1050                         bool used = false;
1051
1052                         list_for_each_entry(sdata, &local->interfaces, list) {
1053                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1054                                            sdata->vif.addr, ETH_ALEN) == 0) {
1055                                         used = true;
1056                                         break;
1057                                 }
1058                         }
1059
1060                         if (!used) {
1061                                 memcpy(dev->perm_addr,
1062                                        local->hw.wiphy->addresses[i].addr,
1063                                        ETH_ALEN);
1064                                 break;
1065                         }
1066                 }
1067
1068                 /* try mask if available */
1069                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1070                         break;
1071
1072                 m = local->hw.wiphy->addr_mask;
1073                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1074                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1075                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1076
1077                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1078                         /* not a contiguous mask ... not handled now! */
1079                         printk(KERN_DEBUG "not contiguous\n");
1080                         break;
1081                 }
1082
1083                 m = local->hw.wiphy->perm_addr;
1084                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1085                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1086                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1087
1088                 inc = 1ULL<<__ffs64(mask);
1089                 val = (start & mask);
1090                 addr = (start & ~mask) | (val & mask);
1091                 do {
1092                         bool used = false;
1093
1094                         tmp_addr[5] = addr >> 0*8;
1095                         tmp_addr[4] = addr >> 1*8;
1096                         tmp_addr[3] = addr >> 2*8;
1097                         tmp_addr[2] = addr >> 3*8;
1098                         tmp_addr[1] = addr >> 4*8;
1099                         tmp_addr[0] = addr >> 5*8;
1100
1101                         val += inc;
1102
1103                         list_for_each_entry(sdata, &local->interfaces, list) {
1104                                 if (memcmp(tmp_addr, sdata->vif.addr,
1105                                                         ETH_ALEN) == 0) {
1106                                         used = true;
1107                                         break;
1108                                 }
1109                         }
1110
1111                         if (!used) {
1112                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1113                                 break;
1114                         }
1115                         addr = (start & ~mask) | (val & mask);
1116                 } while (addr != start);
1117
1118                 break;
1119         }
1120
1121         mutex_unlock(&local->iflist_mtx);
1122 }
1123
1124 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1125                      struct net_device **new_dev, enum nl80211_iftype type,
1126                      struct vif_params *params)
1127 {
1128         struct net_device *ndev;
1129         struct ieee80211_sub_if_data *sdata = NULL;
1130         int ret, i;
1131
1132         ASSERT_RTNL();
1133
1134         ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1135                                name, ieee80211_if_setup, local->hw.queues);
1136         if (!ndev)
1137                 return -ENOMEM;
1138         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1139
1140         ndev->needed_headroom = local->tx_headroom +
1141                                 4*6 /* four MAC addresses */
1142                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1143                                 + 6 /* mesh */
1144                                 + 8 /* rfc1042/bridge tunnel */
1145                                 - ETH_HLEN /* ethernet hard_header_len */
1146                                 + IEEE80211_ENCRYPT_HEADROOM;
1147         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1148
1149         ret = dev_alloc_name(ndev, ndev->name);
1150         if (ret < 0)
1151                 goto fail;
1152
1153         ieee80211_assign_perm_addr(local, ndev, type);
1154         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1155         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1156
1157         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1158         sdata = netdev_priv(ndev);
1159         ndev->ieee80211_ptr = &sdata->wdev;
1160         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1161         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1162
1163         /* initialise type-independent data */
1164         sdata->wdev.wiphy = local->hw.wiphy;
1165         sdata->local = local;
1166         sdata->dev = ndev;
1167 #ifdef CONFIG_INET
1168         sdata->arp_filter_state = true;
1169 #endif
1170
1171         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1172                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1173
1174         INIT_LIST_HEAD(&sdata->key_list);
1175
1176         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1177                 struct ieee80211_supported_band *sband;
1178                 sband = local->hw.wiphy->bands[i];
1179                 sdata->rc_rateidx_mask[i] =
1180                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1181         }
1182
1183         /* setup type-dependent data */
1184         ieee80211_setup_sdata(sdata, type);
1185
1186         if (params) {
1187                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1188                 if (type == NL80211_IFTYPE_STATION)
1189                         sdata->u.mgd.use_4addr = params->use_4addr;
1190         }
1191
1192         ret = register_netdevice(ndev);
1193         if (ret)
1194                 goto fail;
1195
1196         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1197             params && params->mesh_id_len)
1198                 ieee80211_sdata_set_mesh_id(sdata,
1199                                             params->mesh_id_len,
1200                                             params->mesh_id);
1201
1202         mutex_lock(&local->iflist_mtx);
1203         list_add_tail_rcu(&sdata->list, &local->interfaces);
1204         mutex_unlock(&local->iflist_mtx);
1205
1206         if (new_dev)
1207                 *new_dev = ndev;
1208
1209         return 0;
1210
1211  fail:
1212         free_netdev(ndev);
1213         return ret;
1214 }
1215
1216 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1217 {
1218         ASSERT_RTNL();
1219
1220         mutex_lock(&sdata->local->iflist_mtx);
1221         list_del_rcu(&sdata->list);
1222         mutex_unlock(&sdata->local->iflist_mtx);
1223
1224         synchronize_rcu();
1225         unregister_netdevice(sdata->dev);
1226 }
1227
1228 /*
1229  * Remove all interfaces, may only be called at hardware unregistration
1230  * time because it doesn't do RCU-safe list removals.
1231  */
1232 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1233 {
1234         struct ieee80211_sub_if_data *sdata, *tmp;
1235         LIST_HEAD(unreg_list);
1236
1237         ASSERT_RTNL();
1238
1239         mutex_lock(&local->iflist_mtx);
1240         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1241                 list_del(&sdata->list);
1242
1243                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1244         }
1245         mutex_unlock(&local->iflist_mtx);
1246         unregister_netdevice_many(&unreg_list);
1247 }
1248
1249 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1250                               const char *reason)
1251 {
1252         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1253                 return 0;
1254
1255 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1256         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1257 #endif
1258
1259         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1260         return IEEE80211_CONF_CHANGE_IDLE;
1261 }
1262
1263 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1264 {
1265         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1266                 return 0;
1267
1268 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1269         wiphy_debug(local->hw.wiphy, "device now idle\n");
1270 #endif
1271
1272         drv_flush(local, false);
1273
1274         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1275         return IEEE80211_CONF_CHANGE_IDLE;
1276 }
1277
1278 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1279 {
1280         struct ieee80211_sub_if_data *sdata;
1281         int count = 0;
1282         bool working = false, scanning = false;
1283         struct ieee80211_work *wk;
1284
1285 #ifdef CONFIG_PROVE_LOCKING
1286         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1287                 !lockdep_is_held(&local->iflist_mtx));
1288 #endif
1289         lockdep_assert_held(&local->mtx);
1290
1291         list_for_each_entry(sdata, &local->interfaces, list) {
1292                 if (!ieee80211_sdata_running(sdata)) {
1293                         sdata->vif.bss_conf.idle = true;
1294                         continue;
1295                 }
1296
1297                 sdata->old_idle = sdata->vif.bss_conf.idle;
1298
1299                 /* do not count disabled managed interfaces */
1300                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1301                     !sdata->u.mgd.associated) {
1302                         sdata->vif.bss_conf.idle = true;
1303                         continue;
1304                 }
1305                 /* do not count unused IBSS interfaces */
1306                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1307                     !sdata->u.ibss.ssid_len) {
1308                         sdata->vif.bss_conf.idle = true;
1309                         continue;
1310                 }
1311                 /* count everything else */
1312                 count++;
1313         }
1314
1315         list_for_each_entry(wk, &local->work_list, list) {
1316                 working = true;
1317                 wk->sdata->vif.bss_conf.idle = false;
1318         }
1319
1320         if (local->scan_sdata) {
1321                 scanning = true;
1322                 local->scan_sdata->vif.bss_conf.idle = false;
1323         }
1324
1325         list_for_each_entry(sdata, &local->interfaces, list) {
1326                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1327                         continue;
1328                 if (!ieee80211_sdata_running(sdata))
1329                         continue;
1330                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1331         }
1332
1333         if (working)
1334                 return ieee80211_idle_off(local, "working");
1335         if (scanning)
1336                 return ieee80211_idle_off(local, "scanning");
1337         if (!count)
1338                 return ieee80211_idle_on(local);
1339         else
1340                 return ieee80211_idle_off(local, "in use");
1341
1342         return 0;
1343 }
1344
1345 void ieee80211_recalc_idle(struct ieee80211_local *local)
1346 {
1347         u32 chg;
1348
1349         mutex_lock(&local->iflist_mtx);
1350         chg = __ieee80211_recalc_idle(local);
1351         mutex_unlock(&local->iflist_mtx);
1352         if (chg)
1353                 ieee80211_hw_config(local, chg);
1354 }
1355
1356 static int netdev_notify(struct notifier_block *nb,
1357                          unsigned long state,
1358                          void *ndev)
1359 {
1360         struct net_device *dev = ndev;
1361         struct ieee80211_sub_if_data *sdata;
1362
1363         if (state != NETDEV_CHANGENAME)
1364                 return 0;
1365
1366         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1367                 return 0;
1368
1369         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1370                 return 0;
1371
1372         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1373
1374         memcpy(sdata->name, dev->name, IFNAMSIZ);
1375
1376         ieee80211_debugfs_rename_netdev(sdata);
1377         return 0;
1378 }
1379
1380 static struct notifier_block mac80211_netdev_notifier = {
1381         .notifier_call = netdev_notify,
1382 };
1383
1384 int ieee80211_iface_init(void)
1385 {
1386         return register_netdevice_notifier(&mac80211_netdev_notifier);
1387 }
1388
1389 void ieee80211_iface_exit(void)
1390 {
1391         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1392 }