Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-3.10.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 #include "rate.h"
28
29 /**
30  * DOC: Interface list locking
31  *
32  * The interface list in each struct ieee80211_local is protected
33  * three-fold:
34  *
35  * (1) modifications may only be done under the RTNL
36  * (2) modifications and readers are protected against each other by
37  *     the iflist_mtx.
38  * (3) modifications are done in an RCU manner so atomic readers
39  *     can traverse the list in RCU-safe blocks.
40  *
41  * As a consequence, reads (traversals) of the list can be protected
42  * by either the RTNL, the iflist_mtx or RCU.
43  */
44
45
46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
47 {
48         int meshhdrlen;
49         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
50
51         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
52
53         /* FIX: what would be proper limits for MTU?
54          * This interface uses 802.3 frames. */
55         if (new_mtu < 256 ||
56             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
57                 return -EINVAL;
58         }
59
60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
61         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
63         dev->mtu = new_mtu;
64         return 0;
65 }
66
67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
68 {
69         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
70         struct sockaddr *sa = addr;
71         int ret;
72
73         if (ieee80211_sdata_running(sdata))
74                 return -EBUSY;
75
76         ret = eth_mac_addr(dev, sa);
77
78         if (ret == 0)
79                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
80
81         return ret;
82 }
83
84 static inline int identical_mac_addr_allowed(int type1, int type2)
85 {
86         return type1 == NL80211_IFTYPE_MONITOR ||
87                 type2 == NL80211_IFTYPE_MONITOR ||
88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
89                 (type1 == NL80211_IFTYPE_WDS &&
90                         (type2 == NL80211_IFTYPE_WDS ||
91                          type2 == NL80211_IFTYPE_AP)) ||
92                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
93                 (type1 == NL80211_IFTYPE_AP_VLAN &&
94                         (type2 == NL80211_IFTYPE_AP ||
95                          type2 == NL80211_IFTYPE_AP_VLAN));
96 }
97
98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
99                                             enum nl80211_iftype iftype)
100 {
101         struct ieee80211_local *local = sdata->local;
102         struct ieee80211_sub_if_data *nsdata;
103         struct net_device *dev = sdata->dev;
104
105         ASSERT_RTNL();
106
107         /* we hold the RTNL here so can safely walk the list */
108         list_for_each_entry(nsdata, &local->interfaces, list) {
109                 struct net_device *ndev = nsdata->dev;
110
111                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
112                         /*
113                          * Allow only a single IBSS interface to be up at any
114                          * time. This is restricted because beacon distribution
115                          * cannot work properly if both are in the same IBSS.
116                          *
117                          * To remove this restriction we'd have to disallow them
118                          * from setting the same SSID on different IBSS interfaces
119                          * belonging to the same hardware. Then, however, we're
120                          * faced with having to adopt two different TSF timers...
121                          */
122                         if (iftype == NL80211_IFTYPE_ADHOC &&
123                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
124                                 return -EBUSY;
125
126                         /*
127                          * The remaining checks are only performed for interfaces
128                          * with the same MAC address.
129                          */
130                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
131                                 continue;
132
133                         /*
134                          * check whether it may have the same address
135                          */
136                         if (!identical_mac_addr_allowed(iftype,
137                                                         nsdata->vif.type))
138                                 return -ENOTUNIQ;
139
140                         /*
141                          * can only add VLANs to enabled APs
142                          */
143                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
144                             nsdata->vif.type == NL80211_IFTYPE_AP)
145                                 sdata->bss = &nsdata->u.ap;
146                 }
147         }
148
149         return 0;
150 }
151
152 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
153                                     const int offset)
154 {
155         struct ieee80211_local *local = sdata->local;
156         u32 flags = sdata->u.mntr_flags;
157
158 #define ADJUST(_f, _s)  do {                                    \
159         if (flags & MONITOR_FLAG_##_f)                          \
160                 local->fif_##_s += offset;                      \
161         } while (0)
162
163         ADJUST(FCSFAIL, fcsfail);
164         ADJUST(PLCPFAIL, plcpfail);
165         ADJUST(CONTROL, control);
166         ADJUST(CONTROL, pspoll);
167         ADJUST(OTHER_BSS, other_bss);
168
169 #undef ADJUST
170 }
171
172 /*
173  * NOTE: Be very careful when changing this function, it must NOT return
174  * an error on interface type changes that have been pre-checked, so most
175  * checks should be in ieee80211_check_concurrent_iface.
176  */
177 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
178 {
179         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
180         struct ieee80211_local *local = sdata->local;
181         struct sta_info *sta;
182         u32 changed = 0;
183         int res;
184         u32 hw_reconf_flags = 0;
185
186         switch (sdata->vif.type) {
187         case NL80211_IFTYPE_WDS:
188                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
189                         return -ENOLINK;
190                 break;
191         case NL80211_IFTYPE_AP_VLAN: {
192                 struct ieee80211_sub_if_data *master;
193
194                 if (!sdata->bss)
195                         return -ENOLINK;
196
197                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
198
199                 master = container_of(sdata->bss,
200                                       struct ieee80211_sub_if_data, u.ap);
201                 sdata->control_port_protocol =
202                         master->control_port_protocol;
203                 sdata->control_port_no_encrypt =
204                         master->control_port_no_encrypt;
205                 break;
206                 }
207         case NL80211_IFTYPE_AP:
208                 sdata->bss = &sdata->u.ap;
209                 break;
210         case NL80211_IFTYPE_MESH_POINT:
211         case NL80211_IFTYPE_STATION:
212         case NL80211_IFTYPE_MONITOR:
213         case NL80211_IFTYPE_ADHOC:
214                 /* no special treatment */
215                 break;
216         case NL80211_IFTYPE_UNSPECIFIED:
217         case NUM_NL80211_IFTYPES:
218         case NL80211_IFTYPE_P2P_CLIENT:
219         case NL80211_IFTYPE_P2P_GO:
220                 /* cannot happen */
221                 WARN_ON(1);
222                 break;
223         }
224
225         if (local->open_count == 0) {
226                 res = drv_start(local);
227                 if (res)
228                         goto err_del_bss;
229                 if (local->ops->napi_poll)
230                         napi_enable(&local->napi);
231                 /* we're brought up, everything changes */
232                 hw_reconf_flags = ~0;
233                 ieee80211_led_radio(local, true);
234                 ieee80211_mod_tpt_led_trig(local,
235                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
236         }
237
238         /*
239          * Copy the hopefully now-present MAC address to
240          * this interface, if it has the special null one.
241          */
242         if (is_zero_ether_addr(dev->dev_addr)) {
243                 memcpy(dev->dev_addr,
244                        local->hw.wiphy->perm_addr,
245                        ETH_ALEN);
246                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
247
248                 if (!is_valid_ether_addr(dev->dev_addr)) {
249                         if (!local->open_count)
250                                 drv_stop(local);
251                         return -EADDRNOTAVAIL;
252                 }
253         }
254
255         switch (sdata->vif.type) {
256         case NL80211_IFTYPE_AP_VLAN:
257                 /* no need to tell driver */
258                 break;
259         case NL80211_IFTYPE_MONITOR:
260                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
261                         local->cooked_mntrs++;
262                         break;
263                 }
264
265                 /* must be before the call to ieee80211_configure_filter */
266                 local->monitors++;
267                 if (local->monitors == 1) {
268                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
269                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
270                 }
271
272                 ieee80211_adjust_monitor_flags(sdata, 1);
273                 ieee80211_configure_filter(local);
274
275                 netif_carrier_on(dev);
276                 break;
277         default:
278                 if (coming_up) {
279                         res = drv_add_interface(local, sdata);
280                         if (res)
281                                 goto err_stop;
282                 }
283
284                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
285                         local->fif_pspoll++;
286                         local->fif_probe_req++;
287
288                         ieee80211_configure_filter(local);
289                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
290                         local->fif_probe_req++;
291                 }
292
293                 changed |= ieee80211_reset_erp_info(sdata);
294                 ieee80211_bss_info_change_notify(sdata, changed);
295
296                 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
297                     sdata->vif.type == NL80211_IFTYPE_ADHOC)
298                         netif_carrier_off(dev);
299                 else
300                         netif_carrier_on(dev);
301
302                 /*
303                  * set default queue parameters so drivers don't
304                  * need to initialise the hardware if the hardware
305                  * doesn't start up with sane defaults
306                  */
307                 ieee80211_set_wmm_default(sdata);
308         }
309
310         set_bit(SDATA_STATE_RUNNING, &sdata->state);
311
312         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
313                 /* Create STA entry for the WDS peer */
314                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
315                                      GFP_KERNEL);
316                 if (!sta) {
317                         res = -ENOMEM;
318                         goto err_del_interface;
319                 }
320
321                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
322                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
323                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
324
325                 res = sta_info_insert(sta);
326                 if (res) {
327                         /* STA has been freed */
328                         goto err_del_interface;
329                 }
330
331                 rate_control_rate_init(sta);
332         }
333
334         /*
335          * set_multicast_list will be invoked by the networking core
336          * which will check whether any increments here were done in
337          * error and sync them down to the hardware as filter flags.
338          */
339         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
340                 atomic_inc(&local->iff_allmultis);
341
342         if (sdata->flags & IEEE80211_SDATA_PROMISC)
343                 atomic_inc(&local->iff_promiscs);
344
345         mutex_lock(&local->mtx);
346         hw_reconf_flags |= __ieee80211_recalc_idle(local);
347         mutex_unlock(&local->mtx);
348
349         if (coming_up)
350                 local->open_count++;
351
352         if (hw_reconf_flags)
353                 ieee80211_hw_config(local, hw_reconf_flags);
354
355         ieee80211_recalc_ps(local, -1);
356
357         netif_tx_start_all_queues(dev);
358
359         return 0;
360  err_del_interface:
361         drv_remove_interface(local, sdata);
362  err_stop:
363         if (!local->open_count)
364                 drv_stop(local);
365  err_del_bss:
366         sdata->bss = NULL;
367         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
368                 list_del(&sdata->u.vlan.list);
369         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
370         return res;
371 }
372
373 static int ieee80211_open(struct net_device *dev)
374 {
375         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
376         int err;
377
378         /* fail early if user set an invalid address */
379         if (!is_valid_ether_addr(dev->dev_addr))
380                 return -EADDRNOTAVAIL;
381
382         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
383         if (err)
384                 return err;
385
386         return ieee80211_do_open(dev, true);
387 }
388
389 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
390                               bool going_down)
391 {
392         struct ieee80211_local *local = sdata->local;
393         unsigned long flags;
394         struct sk_buff *skb, *tmp;
395         u32 hw_reconf_flags = 0;
396         int i;
397         enum nl80211_channel_type orig_ct;
398
399         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
400
401         if (local->scan_sdata == sdata)
402                 ieee80211_scan_cancel(local);
403
404         /*
405          * Stop TX on this interface first.
406          */
407         netif_tx_stop_all_queues(sdata->dev);
408
409         /*
410          * Purge work for this interface.
411          */
412         ieee80211_work_purge(sdata);
413
414         /*
415          * Remove all stations associated with this interface.
416          *
417          * This must be done before calling ops->remove_interface()
418          * because otherwise we can later invoke ops->sta_notify()
419          * whenever the STAs are removed, and that invalidates driver
420          * assumptions about always getting a vif pointer that is valid
421          * (because if we remove a STA after ops->remove_interface()
422          * the driver will have removed the vif info already!)
423          *
424          * This is relevant only in AP, WDS and mesh modes, since in
425          * all other modes we've already removed all stations when
426          * disconnecting etc.
427          */
428         sta_info_flush(local, sdata);
429
430         /*
431          * Don't count this interface for promisc/allmulti while it
432          * is down. dev_mc_unsync() will invoke set_multicast_list
433          * on the master interface which will sync these down to the
434          * hardware as filter flags.
435          */
436         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
437                 atomic_dec(&local->iff_allmultis);
438
439         if (sdata->flags & IEEE80211_SDATA_PROMISC)
440                 atomic_dec(&local->iff_promiscs);
441
442         if (sdata->vif.type == NL80211_IFTYPE_AP) {
443                 local->fif_pspoll--;
444                 local->fif_probe_req--;
445         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
446                 local->fif_probe_req--;
447         }
448
449         netif_addr_lock_bh(sdata->dev);
450         spin_lock_bh(&local->filter_lock);
451         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
452                          sdata->dev->addr_len);
453         spin_unlock_bh(&local->filter_lock);
454         netif_addr_unlock_bh(sdata->dev);
455
456         ieee80211_configure_filter(local);
457
458         del_timer_sync(&local->dynamic_ps_timer);
459         cancel_work_sync(&local->dynamic_ps_enable_work);
460
461         /* APs need special treatment */
462         if (sdata->vif.type == NL80211_IFTYPE_AP) {
463                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
464                 struct beacon_data *old_beacon =
465                         rtnl_dereference(sdata->u.ap.beacon);
466                 struct sk_buff *old_probe_resp =
467                         rtnl_dereference(sdata->u.ap.probe_resp);
468
469                 /* sdata_running will return false, so this will disable */
470                 ieee80211_bss_info_change_notify(sdata,
471                                                  BSS_CHANGED_BEACON_ENABLED);
472
473                 /* remove beacon and probe response */
474                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
475                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
476                 synchronize_rcu();
477                 kfree(old_beacon);
478                 kfree_skb(old_probe_resp);
479
480                 /* down all dependent devices, that is VLANs */
481                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
482                                          u.vlan.list)
483                         dev_close(vlan->dev);
484                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
485
486                 /* free all potentially still buffered bcast frames */
487                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
488                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
489         }
490
491         if (going_down)
492                 local->open_count--;
493
494         switch (sdata->vif.type) {
495         case NL80211_IFTYPE_AP_VLAN:
496                 list_del(&sdata->u.vlan.list);
497                 /* no need to tell driver */
498                 break;
499         case NL80211_IFTYPE_MONITOR:
500                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
501                         local->cooked_mntrs--;
502                         break;
503                 }
504
505                 local->monitors--;
506                 if (local->monitors == 0) {
507                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
508                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
509                 }
510
511                 ieee80211_adjust_monitor_flags(sdata, -1);
512                 ieee80211_configure_filter(local);
513                 break;
514         default:
515                 flush_work(&sdata->work);
516                 /*
517                  * When we get here, the interface is marked down.
518                  * Call synchronize_rcu() to wait for the RX path
519                  * should it be using the interface and enqueuing
520                  * frames at this very time on another CPU.
521                  */
522                 synchronize_rcu();
523                 skb_queue_purge(&sdata->skb_queue);
524
525                 /*
526                  * Disable beaconing here for mesh only, AP and IBSS
527                  * are already taken care of.
528                  */
529                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
530                         ieee80211_bss_info_change_notify(sdata,
531                                 BSS_CHANGED_BEACON_ENABLED);
532
533                 /*
534                  * Free all remaining keys, there shouldn't be any,
535                  * except maybe group keys in AP more or WDS?
536                  */
537                 ieee80211_free_keys(sdata);
538
539                 if (going_down)
540                         drv_remove_interface(local, sdata);
541         }
542
543         sdata->bss = NULL;
544
545         mutex_lock(&local->mtx);
546         hw_reconf_flags |= __ieee80211_recalc_idle(local);
547         mutex_unlock(&local->mtx);
548
549         ieee80211_recalc_ps(local, -1);
550
551         if (local->open_count == 0) {
552                 if (local->ops->napi_poll)
553                         napi_disable(&local->napi);
554                 ieee80211_clear_tx_pending(local);
555                 ieee80211_stop_device(local);
556
557                 /* no reconfiguring after stop! */
558                 hw_reconf_flags = 0;
559         }
560
561         /* Re-calculate channel-type, in case there are multiple vifs
562          * on different channel types.
563          */
564         orig_ct = local->_oper_channel_type;
565         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
566
567         /* do after stop to avoid reconfiguring when we stop anyway */
568         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
569                 ieee80211_hw_config(local, hw_reconf_flags);
570
571         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
572         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
573                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
574                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
575                         if (info->control.vif == &sdata->vif) {
576                                 __skb_unlink(skb, &local->pending[i]);
577                                 dev_kfree_skb_irq(skb);
578                         }
579                 }
580         }
581         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
582 }
583
584 static int ieee80211_stop(struct net_device *dev)
585 {
586         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
587
588         ieee80211_do_stop(sdata, true);
589
590         return 0;
591 }
592
593 static void ieee80211_set_multicast_list(struct net_device *dev)
594 {
595         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
596         struct ieee80211_local *local = sdata->local;
597         int allmulti, promisc, sdata_allmulti, sdata_promisc;
598
599         allmulti = !!(dev->flags & IFF_ALLMULTI);
600         promisc = !!(dev->flags & IFF_PROMISC);
601         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
602         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
603
604         if (allmulti != sdata_allmulti) {
605                 if (dev->flags & IFF_ALLMULTI)
606                         atomic_inc(&local->iff_allmultis);
607                 else
608                         atomic_dec(&local->iff_allmultis);
609                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
610         }
611
612         if (promisc != sdata_promisc) {
613                 if (dev->flags & IFF_PROMISC)
614                         atomic_inc(&local->iff_promiscs);
615                 else
616                         atomic_dec(&local->iff_promiscs);
617                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
618         }
619         spin_lock_bh(&local->filter_lock);
620         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
621         spin_unlock_bh(&local->filter_lock);
622         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
623 }
624
625 /*
626  * Called when the netdev is removed or, by the code below, before
627  * the interface type changes.
628  */
629 static void ieee80211_teardown_sdata(struct net_device *dev)
630 {
631         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
632         struct ieee80211_local *local = sdata->local;
633         int flushed;
634         int i;
635
636         /* free extra data */
637         ieee80211_free_keys(sdata);
638
639         ieee80211_debugfs_remove_netdev(sdata);
640
641         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
642                 __skb_queue_purge(&sdata->fragments[i].skb_list);
643         sdata->fragment_next = 0;
644
645         if (ieee80211_vif_is_mesh(&sdata->vif))
646                 mesh_rmc_free(sdata);
647
648         flushed = sta_info_flush(local, sdata);
649         WARN_ON(flushed);
650 }
651
652 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
653                                          struct sk_buff *skb)
654 {
655         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
656 }
657
658 static const struct net_device_ops ieee80211_dataif_ops = {
659         .ndo_open               = ieee80211_open,
660         .ndo_stop               = ieee80211_stop,
661         .ndo_uninit             = ieee80211_teardown_sdata,
662         .ndo_start_xmit         = ieee80211_subif_start_xmit,
663         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
664         .ndo_change_mtu         = ieee80211_change_mtu,
665         .ndo_set_mac_address    = ieee80211_change_mac,
666         .ndo_select_queue       = ieee80211_netdev_select_queue,
667 };
668
669 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
670                                           struct sk_buff *skb)
671 {
672         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
673         struct ieee80211_local *local = sdata->local;
674         struct ieee80211_hdr *hdr;
675         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
676
677         if (local->hw.queues < 4)
678                 return 0;
679
680         if (skb->len < 4 ||
681             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
682                 return 0; /* doesn't matter, frame will be dropped */
683
684         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
685
686         return ieee80211_select_queue_80211(local, skb, hdr);
687 }
688
689 static const struct net_device_ops ieee80211_monitorif_ops = {
690         .ndo_open               = ieee80211_open,
691         .ndo_stop               = ieee80211_stop,
692         .ndo_uninit             = ieee80211_teardown_sdata,
693         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
694         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
695         .ndo_change_mtu         = ieee80211_change_mtu,
696         .ndo_set_mac_address    = eth_mac_addr,
697         .ndo_select_queue       = ieee80211_monitor_select_queue,
698 };
699
700 static void ieee80211_if_setup(struct net_device *dev)
701 {
702         ether_setup(dev);
703         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
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                                         true);
798                         }
799                         mutex_unlock(&local->sta_mtx);
800                 } else switch (sdata->vif.type) {
801                 case NL80211_IFTYPE_STATION:
802                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
803                         break;
804                 case NL80211_IFTYPE_ADHOC:
805                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
806                         break;
807                 case NL80211_IFTYPE_MESH_POINT:
808                         if (!ieee80211_vif_is_mesh(&sdata->vif))
809                                 break;
810                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
811                         break;
812                 default:
813                         WARN(1, "frame for unexpected interface type");
814                         break;
815                 }
816
817                 kfree_skb(skb);
818         }
819
820         /* then other type-dependent work */
821         switch (sdata->vif.type) {
822         case NL80211_IFTYPE_STATION:
823                 ieee80211_sta_work(sdata);
824                 break;
825         case NL80211_IFTYPE_ADHOC:
826                 ieee80211_ibss_work(sdata);
827                 break;
828         case NL80211_IFTYPE_MESH_POINT:
829                 if (!ieee80211_vif_is_mesh(&sdata->vif))
830                         break;
831                 ieee80211_mesh_work(sdata);
832                 break;
833         default:
834                 break;
835         }
836 }
837
838
839 /*
840  * Helper function to initialise an interface to a specific type.
841  */
842 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
843                                   enum nl80211_iftype type)
844 {
845         /* clear type-dependent union */
846         memset(&sdata->u, 0, sizeof(sdata->u));
847
848         /* and set some type-dependent values */
849         sdata->vif.type = type;
850         sdata->vif.p2p = false;
851         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
852         sdata->wdev.iftype = type;
853
854         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
855         sdata->control_port_no_encrypt = false;
856
857         sdata->noack_map = 0;
858
859         /* only monitor differs */
860         sdata->dev->type = ARPHRD_ETHER;
861
862         skb_queue_head_init(&sdata->skb_queue);
863         INIT_WORK(&sdata->work, ieee80211_iface_work);
864
865         switch (type) {
866         case NL80211_IFTYPE_P2P_GO:
867                 type = NL80211_IFTYPE_AP;
868                 sdata->vif.type = type;
869                 sdata->vif.p2p = true;
870                 /* fall through */
871         case NL80211_IFTYPE_AP:
872                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
873                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
874                 break;
875         case NL80211_IFTYPE_P2P_CLIENT:
876                 type = NL80211_IFTYPE_STATION;
877                 sdata->vif.type = type;
878                 sdata->vif.p2p = true;
879                 /* fall through */
880         case NL80211_IFTYPE_STATION:
881                 ieee80211_sta_setup_sdata(sdata);
882                 break;
883         case NL80211_IFTYPE_ADHOC:
884                 ieee80211_ibss_setup_sdata(sdata);
885                 break;
886         case NL80211_IFTYPE_MESH_POINT:
887                 if (ieee80211_vif_is_mesh(&sdata->vif))
888                         ieee80211_mesh_init_sdata(sdata);
889                 break;
890         case NL80211_IFTYPE_MONITOR:
891                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
892                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
893                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
894                                       MONITOR_FLAG_OTHER_BSS;
895                 break;
896         case NL80211_IFTYPE_WDS:
897         case NL80211_IFTYPE_AP_VLAN:
898                 break;
899         case NL80211_IFTYPE_UNSPECIFIED:
900         case NUM_NL80211_IFTYPES:
901                 BUG();
902                 break;
903         }
904
905         ieee80211_debugfs_add_netdev(sdata);
906 }
907
908 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
909                                            enum nl80211_iftype type)
910 {
911         struct ieee80211_local *local = sdata->local;
912         int ret, err;
913         enum nl80211_iftype internal_type = type;
914         bool p2p = false;
915
916         ASSERT_RTNL();
917
918         if (!local->ops->change_interface)
919                 return -EBUSY;
920
921         switch (sdata->vif.type) {
922         case NL80211_IFTYPE_AP:
923         case NL80211_IFTYPE_STATION:
924         case NL80211_IFTYPE_ADHOC:
925                 /*
926                  * Could maybe also all others here?
927                  * Just not sure how that interacts
928                  * with the RX/config path e.g. for
929                  * mesh.
930                  */
931                 break;
932         default:
933                 return -EBUSY;
934         }
935
936         switch (type) {
937         case NL80211_IFTYPE_AP:
938         case NL80211_IFTYPE_STATION:
939         case NL80211_IFTYPE_ADHOC:
940                 /*
941                  * Could probably support everything
942                  * but WDS here (WDS do_open can fail
943                  * under memory pressure, which this
944                  * code isn't prepared to handle).
945                  */
946                 break;
947         case NL80211_IFTYPE_P2P_CLIENT:
948                 p2p = true;
949                 internal_type = NL80211_IFTYPE_STATION;
950                 break;
951         case NL80211_IFTYPE_P2P_GO:
952                 p2p = true;
953                 internal_type = NL80211_IFTYPE_AP;
954                 break;
955         default:
956                 return -EBUSY;
957         }
958
959         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
960         if (ret)
961                 return ret;
962
963         ieee80211_do_stop(sdata, false);
964
965         ieee80211_teardown_sdata(sdata->dev);
966
967         ret = drv_change_interface(local, sdata, internal_type, p2p);
968         if (ret)
969                 type = sdata->vif.type;
970
971         ieee80211_setup_sdata(sdata, type);
972
973         err = ieee80211_do_open(sdata->dev, false);
974         WARN(err, "type change: do_open returned %d", err);
975
976         return ret;
977 }
978
979 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
980                              enum nl80211_iftype type)
981 {
982         int ret;
983
984         ASSERT_RTNL();
985
986         if (type == ieee80211_vif_type_p2p(&sdata->vif))
987                 return 0;
988
989         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
990         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
991             type == NL80211_IFTYPE_ADHOC)
992                 return -EOPNOTSUPP;
993
994         if (ieee80211_sdata_running(sdata)) {
995                 ret = ieee80211_runtime_change_iftype(sdata, type);
996                 if (ret)
997                         return ret;
998         } else {
999                 /* Purge and reset type-dependent state. */
1000                 ieee80211_teardown_sdata(sdata->dev);
1001                 ieee80211_setup_sdata(sdata, type);
1002         }
1003
1004         /* reset some values that shouldn't be kept across type changes */
1005         sdata->vif.bss_conf.basic_rates =
1006                 ieee80211_mandatory_rates(sdata->local,
1007                         sdata->local->hw.conf.channel->band);
1008         sdata->drop_unencrypted = 0;
1009         if (type == NL80211_IFTYPE_STATION)
1010                 sdata->u.mgd.use_4addr = false;
1011
1012         return 0;
1013 }
1014
1015 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1016                                        struct net_device *dev,
1017                                        enum nl80211_iftype type)
1018 {
1019         struct ieee80211_sub_if_data *sdata;
1020         u64 mask, start, addr, val, inc;
1021         u8 *m;
1022         u8 tmp_addr[ETH_ALEN];
1023         int i;
1024
1025         /* default ... something at least */
1026         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1027
1028         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1029             local->hw.wiphy->n_addresses <= 1)
1030                 return;
1031
1032
1033         mutex_lock(&local->iflist_mtx);
1034
1035         switch (type) {
1036         case NL80211_IFTYPE_MONITOR:
1037                 /* doesn't matter */
1038                 break;
1039         case NL80211_IFTYPE_WDS:
1040         case NL80211_IFTYPE_AP_VLAN:
1041                 /* match up with an AP interface */
1042                 list_for_each_entry(sdata, &local->interfaces, list) {
1043                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1044                                 continue;
1045                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1046                         break;
1047                 }
1048                 /* keep default if no AP interface present */
1049                 break;
1050         default:
1051                 /* assign a new address if possible -- try n_addresses first */
1052                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1053                         bool used = false;
1054
1055                         list_for_each_entry(sdata, &local->interfaces, list) {
1056                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1057                                            sdata->vif.addr, ETH_ALEN) == 0) {
1058                                         used = true;
1059                                         break;
1060                                 }
1061                         }
1062
1063                         if (!used) {
1064                                 memcpy(dev->perm_addr,
1065                                        local->hw.wiphy->addresses[i].addr,
1066                                        ETH_ALEN);
1067                                 break;
1068                         }
1069                 }
1070
1071                 /* try mask if available */
1072                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1073                         break;
1074
1075                 m = local->hw.wiphy->addr_mask;
1076                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1077                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1078                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1079
1080                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1081                         /* not a contiguous mask ... not handled now! */
1082                         printk(KERN_DEBUG "not contiguous\n");
1083                         break;
1084                 }
1085
1086                 m = local->hw.wiphy->perm_addr;
1087                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1088                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1089                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1090
1091                 inc = 1ULL<<__ffs64(mask);
1092                 val = (start & mask);
1093                 addr = (start & ~mask) | (val & mask);
1094                 do {
1095                         bool used = false;
1096
1097                         tmp_addr[5] = addr >> 0*8;
1098                         tmp_addr[4] = addr >> 1*8;
1099                         tmp_addr[3] = addr >> 2*8;
1100                         tmp_addr[2] = addr >> 3*8;
1101                         tmp_addr[1] = addr >> 4*8;
1102                         tmp_addr[0] = addr >> 5*8;
1103
1104                         val += inc;
1105
1106                         list_for_each_entry(sdata, &local->interfaces, list) {
1107                                 if (memcmp(tmp_addr, sdata->vif.addr,
1108                                                         ETH_ALEN) == 0) {
1109                                         used = true;
1110                                         break;
1111                                 }
1112                         }
1113
1114                         if (!used) {
1115                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1116                                 break;
1117                         }
1118                         addr = (start & ~mask) | (val & mask);
1119                 } while (addr != start);
1120
1121                 break;
1122         }
1123
1124         mutex_unlock(&local->iflist_mtx);
1125 }
1126
1127 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1128                      struct net_device **new_dev, enum nl80211_iftype type,
1129                      struct vif_params *params)
1130 {
1131         struct net_device *ndev;
1132         struct ieee80211_sub_if_data *sdata = NULL;
1133         int ret, i;
1134
1135         ASSERT_RTNL();
1136
1137         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1138                                 name, ieee80211_if_setup, local->hw.queues, 1);
1139         if (!ndev)
1140                 return -ENOMEM;
1141         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1142
1143         ndev->needed_headroom = local->tx_headroom +
1144                                 4*6 /* four MAC addresses */
1145                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1146                                 + 6 /* mesh */
1147                                 + 8 /* rfc1042/bridge tunnel */
1148                                 - ETH_HLEN /* ethernet hard_header_len */
1149                                 + IEEE80211_ENCRYPT_HEADROOM;
1150         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1151
1152         ret = dev_alloc_name(ndev, ndev->name);
1153         if (ret < 0)
1154                 goto fail;
1155
1156         ieee80211_assign_perm_addr(local, ndev, type);
1157         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1158         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1159
1160         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1161         sdata = netdev_priv(ndev);
1162         ndev->ieee80211_ptr = &sdata->wdev;
1163         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1164         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1165
1166         /* initialise type-independent data */
1167         sdata->wdev.wiphy = local->hw.wiphy;
1168         sdata->local = local;
1169         sdata->dev = ndev;
1170 #ifdef CONFIG_INET
1171         sdata->arp_filter_state = true;
1172 #endif
1173
1174         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1175                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1176
1177         INIT_LIST_HEAD(&sdata->key_list);
1178
1179         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1180                 struct ieee80211_supported_band *sband;
1181                 sband = local->hw.wiphy->bands[i];
1182                 sdata->rc_rateidx_mask[i] =
1183                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1184                 if (sband)
1185                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1186                                sband->ht_cap.mcs.rx_mask,
1187                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1188                 else
1189                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1190                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1191         }
1192
1193         /* setup type-dependent data */
1194         ieee80211_setup_sdata(sdata, type);
1195
1196         if (params) {
1197                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1198                 if (type == NL80211_IFTYPE_STATION)
1199                         sdata->u.mgd.use_4addr = params->use_4addr;
1200         }
1201
1202         ret = register_netdevice(ndev);
1203         if (ret)
1204                 goto fail;
1205
1206         mutex_lock(&local->iflist_mtx);
1207         list_add_tail_rcu(&sdata->list, &local->interfaces);
1208         mutex_unlock(&local->iflist_mtx);
1209
1210         if (new_dev)
1211                 *new_dev = ndev;
1212
1213         return 0;
1214
1215  fail:
1216         free_netdev(ndev);
1217         return ret;
1218 }
1219
1220 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1221 {
1222         ASSERT_RTNL();
1223
1224         mutex_lock(&sdata->local->iflist_mtx);
1225         list_del_rcu(&sdata->list);
1226         mutex_unlock(&sdata->local->iflist_mtx);
1227
1228         if (ieee80211_vif_is_mesh(&sdata->vif))
1229                 mesh_path_flush_by_iface(sdata);
1230
1231         synchronize_rcu();
1232         unregister_netdevice(sdata->dev);
1233 }
1234
1235 /*
1236  * Remove all interfaces, may only be called at hardware unregistration
1237  * time because it doesn't do RCU-safe list removals.
1238  */
1239 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1240 {
1241         struct ieee80211_sub_if_data *sdata, *tmp;
1242         LIST_HEAD(unreg_list);
1243
1244         ASSERT_RTNL();
1245
1246         mutex_lock(&local->iflist_mtx);
1247         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1248                 list_del(&sdata->list);
1249
1250                 if (ieee80211_vif_is_mesh(&sdata->vif))
1251                         mesh_path_flush_by_iface(sdata);
1252
1253                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1254         }
1255         mutex_unlock(&local->iflist_mtx);
1256         unregister_netdevice_many(&unreg_list);
1257         list_del(&unreg_list);
1258 }
1259
1260 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1261                               const char *reason)
1262 {
1263         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1264                 return 0;
1265
1266 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1267         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1268 #endif
1269
1270         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1271         return IEEE80211_CONF_CHANGE_IDLE;
1272 }
1273
1274 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1275 {
1276         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1277                 return 0;
1278
1279 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1280         wiphy_debug(local->hw.wiphy, "device now idle\n");
1281 #endif
1282
1283         drv_flush(local, false);
1284
1285         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1286         return IEEE80211_CONF_CHANGE_IDLE;
1287 }
1288
1289 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1290 {
1291         struct ieee80211_sub_if_data *sdata;
1292         int count = 0;
1293         bool working = false, scanning = false, hw_roc = false;
1294         struct ieee80211_work *wk;
1295         unsigned int led_trig_start = 0, led_trig_stop = 0;
1296
1297 #ifdef CONFIG_PROVE_LOCKING
1298         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1299                 !lockdep_is_held(&local->iflist_mtx));
1300 #endif
1301         lockdep_assert_held(&local->mtx);
1302
1303         list_for_each_entry(sdata, &local->interfaces, list) {
1304                 if (!ieee80211_sdata_running(sdata)) {
1305                         sdata->vif.bss_conf.idle = true;
1306                         continue;
1307                 }
1308
1309                 sdata->old_idle = sdata->vif.bss_conf.idle;
1310
1311                 /* do not count disabled managed interfaces */
1312                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1313                     !sdata->u.mgd.associated &&
1314                     !sdata->u.mgd.auth_data &&
1315                     !sdata->u.mgd.assoc_data) {
1316                         sdata->vif.bss_conf.idle = true;
1317                         continue;
1318                 }
1319                 /* do not count unused IBSS interfaces */
1320                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1321                     !sdata->u.ibss.ssid_len) {
1322                         sdata->vif.bss_conf.idle = true;
1323                         continue;
1324                 }
1325                 /* count everything else */
1326                 sdata->vif.bss_conf.idle = false;
1327                 count++;
1328         }
1329
1330         list_for_each_entry(wk, &local->work_list, list) {
1331                 working = true;
1332                 wk->sdata->vif.bss_conf.idle = false;
1333         }
1334
1335         if (local->scan_sdata &&
1336             !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1337                 scanning = true;
1338                 local->scan_sdata->vif.bss_conf.idle = false;
1339         }
1340
1341         if (local->hw_roc_channel)
1342                 hw_roc = true;
1343
1344         list_for_each_entry(sdata, &local->interfaces, list) {
1345                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1346                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1347                         continue;
1348                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1349                         continue;
1350                 if (!ieee80211_sdata_running(sdata))
1351                         continue;
1352                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1353         }
1354
1355         if (working || scanning || hw_roc)
1356                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1357         else
1358                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1359
1360         if (count)
1361                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1362         else
1363                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1364
1365         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1366
1367         if (hw_roc)
1368                 return ieee80211_idle_off(local, "hw remain-on-channel");
1369         if (working)
1370                 return ieee80211_idle_off(local, "working");
1371         if (scanning)
1372                 return ieee80211_idle_off(local, "scanning");
1373         if (!count)
1374                 return ieee80211_idle_on(local);
1375         else
1376                 return ieee80211_idle_off(local, "in use");
1377
1378         return 0;
1379 }
1380
1381 void ieee80211_recalc_idle(struct ieee80211_local *local)
1382 {
1383         u32 chg;
1384
1385         mutex_lock(&local->iflist_mtx);
1386         chg = __ieee80211_recalc_idle(local);
1387         mutex_unlock(&local->iflist_mtx);
1388         if (chg)
1389                 ieee80211_hw_config(local, chg);
1390 }
1391
1392 static int netdev_notify(struct notifier_block *nb,
1393                          unsigned long state,
1394                          void *ndev)
1395 {
1396         struct net_device *dev = ndev;
1397         struct ieee80211_sub_if_data *sdata;
1398
1399         if (state != NETDEV_CHANGENAME)
1400                 return 0;
1401
1402         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1403                 return 0;
1404
1405         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1406                 return 0;
1407
1408         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1409
1410         memcpy(sdata->name, dev->name, IFNAMSIZ);
1411
1412         ieee80211_debugfs_rename_netdev(sdata);
1413         return 0;
1414 }
1415
1416 static struct notifier_block mac80211_netdev_notifier = {
1417         .notifier_call = netdev_notify,
1418 };
1419
1420 int ieee80211_iface_init(void)
1421 {
1422         return register_netdevice_notifier(&mac80211_netdev_notifier);
1423 }
1424
1425 void ieee80211_iface_exit(void)
1426 {
1427         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1428 }