Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

Linux/net/mac80211/iface.c

  1 /*
  2  * Interface handling
  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  * Copyright 2013-2014  Intel Mobile Communications GmbH
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  */
 14 #include <linux/slab.h>
 15 #include <linux/kernel.h>
 16 #include <linux/if_arp.h>
 17 #include <linux/netdevice.h>
 18 #include <linux/rtnetlink.h>
 19 #include <net/mac80211.h>
 20 #include <net/ieee80211_radiotap.h>
 21 #include "ieee80211_i.h"
 22 #include "sta_info.h"
 23 #include "debugfs_netdev.h"
 24 #include "mesh.h"
 25 #include "led.h"
 26 #include "driver-ops.h"
 27 #include "wme.h"
 28 #include "rate.h"
 29 
 30 /**
 31  * DOC: Interface list locking
 32  *
 33  * The interface list in each struct ieee80211_local is protected
 34  * three-fold:
 35  *
 36  * (1) modifications may only be done under the RTNL
 37  * (2) modifications and readers are protected against each other by
 38  *     the iflist_mtx.
 39  * (3) modifications are done in an RCU manner so atomic readers
 40  *     can traverse the list in RCU-safe blocks.
 41  *
 42  * As a consequence, reads (traversals) of the list can be protected
 43  * by either the RTNL, the iflist_mtx or RCU.
 44  */
 45 
 46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 47 {
 48         struct ieee80211_chanctx_conf *chanctx_conf;
 49         int power;
 50 
 51         rcu_read_lock();
 52         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 53         if (!chanctx_conf) {
 54                 rcu_read_unlock();
 55                 return false;
 56         }
 57 
 58         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 59         rcu_read_unlock();
 60 
 61         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 62                 power = min(power, sdata->user_power_level);
 63 
 64         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 65                 power = min(power, sdata->ap_power_level);
 66 
 67         if (power != sdata->vif.bss_conf.txpower) {
 68                 sdata->vif.bss_conf.txpower = power;
 69                 ieee80211_hw_config(sdata->local, 0);
 70                 return true;
 71         }
 72 
 73         return false;
 74 }
 75 
 76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 77                               bool update_bss)
 78 {
 79         if (__ieee80211_recalc_txpower(sdata) || update_bss)
 80                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 81 }
 82 
 83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 84 {
 85         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 86                 return 0;
 87 
 88         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 89         return IEEE80211_CONF_CHANGE_IDLE;
 90 }
 91 
 92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 93 {
 94         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 95                 return 0;
 96 
 97         ieee80211_flush_queues(local, NULL, false);
 98 
 99         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
100         return IEEE80211_CONF_CHANGE_IDLE;
101 }
102 
103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
104                                    bool force_active)
105 {
106         bool working, scanning, active;
107         unsigned int led_trig_start = 0, led_trig_stop = 0;
108 
109         lockdep_assert_held(&local->mtx);
110 
111         active = force_active ||
112                  !list_empty(&local->chanctx_list) ||
113                  local->monitors;
114 
115         working = !local->ops->remain_on_channel &&
116                   !list_empty(&local->roc_list);
117 
118         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
119                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
120 
121         if (working || scanning)
122                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123         else
124                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125 
126         if (active)
127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128         else
129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130 
131         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
132 
133         if (working || scanning || active)
134                 return __ieee80211_idle_off(local);
135         return __ieee80211_idle_on(local);
136 }
137 
138 u32 ieee80211_idle_off(struct ieee80211_local *local)
139 {
140         return __ieee80211_recalc_idle(local, true);
141 }
142 
143 void ieee80211_recalc_idle(struct ieee80211_local *local)
144 {
145         u32 change = __ieee80211_recalc_idle(local, false);
146         if (change)
147                 ieee80211_hw_config(local, change);
148 }
149 
150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
151 {
152         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
153                 return -EINVAL;
154 
155         dev->mtu = new_mtu;
156         return 0;
157 }
158 
159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
160                                 bool check_dup)
161 {
162         struct ieee80211_local *local = sdata->local;
163         struct ieee80211_sub_if_data *iter;
164         u64 new, mask, tmp;
165         u8 *m;
166         int ret = 0;
167 
168         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
169                 return 0;
170 
171         m = addr;
172         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175 
176         m = local->hw.wiphy->addr_mask;
177         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
178                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
179                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
180 
181         if (!check_dup)
182                 return ret;
183 
184         mutex_lock(&local->iflist_mtx);
185         list_for_each_entry(iter, &local->interfaces, list) {
186                 if (iter == sdata)
187                         continue;
188 
189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
190                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
191                         continue;
192 
193                 m = iter->vif.addr;
194                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
195                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
196                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
197 
198                 if ((new & ~mask) != (tmp & ~mask)) {
199                         ret = -EINVAL;
200                         break;
201                 }
202         }
203         mutex_unlock(&local->iflist_mtx);
204 
205         return ret;
206 }
207 
208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
209 {
210         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
211         struct sockaddr *sa = addr;
212         bool check_dup = true;
213         int ret;
214 
215         if (ieee80211_sdata_running(sdata))
216                 return -EBUSY;
217 
218         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
219             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
220                 check_dup = false;
221 
222         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
223         if (ret)
224                 return ret;
225 
226         ret = eth_mac_addr(dev, sa);
227 
228         if (ret == 0)
229                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
230 
231         return ret;
232 }
233 
234 static inline int identical_mac_addr_allowed(int type1, int type2)
235 {
236         return type1 == NL80211_IFTYPE_MONITOR ||
237                 type2 == NL80211_IFTYPE_MONITOR ||
238                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
239                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
241                 (type1 == NL80211_IFTYPE_WDS &&
242                         (type2 == NL80211_IFTYPE_WDS ||
243                          type2 == NL80211_IFTYPE_AP)) ||
244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
245                 (type1 == NL80211_IFTYPE_AP_VLAN &&
246                         (type2 == NL80211_IFTYPE_AP ||
247                          type2 == NL80211_IFTYPE_AP_VLAN));
248 }
249 
250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
251                                             enum nl80211_iftype iftype)
252 {
253         struct ieee80211_local *local = sdata->local;
254         struct ieee80211_sub_if_data *nsdata;
255         int ret;
256 
257         ASSERT_RTNL();
258 
259         /* we hold the RTNL here so can safely walk the list */
260         list_for_each_entry(nsdata, &local->interfaces, list) {
261                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
262                         /*
263                          * Only OCB and monitor mode may coexist
264                          */
265                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
266                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
267                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
268                              nsdata->vif.type == NL80211_IFTYPE_OCB))
269                                 return -EBUSY;
270 
271                         /*
272                          * Allow only a single IBSS interface to be up at any
273                          * time. This is restricted because beacon distribution
274                          * cannot work properly if both are in the same IBSS.
275                          *
276                          * To remove this restriction we'd have to disallow them
277                          * from setting the same SSID on different IBSS interfaces
278                          * belonging to the same hardware. Then, however, we're
279                          * faced with having to adopt two different TSF timers...
280                          */
281                         if (iftype == NL80211_IFTYPE_ADHOC &&
282                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
283                                 return -EBUSY;
284                         /*
285                          * will not add another interface while any channel
286                          * switch is active.
287                          */
288                         if (nsdata->vif.csa_active)
289                                 return -EBUSY;
290 
291                         /*
292                          * The remaining checks are only performed for interfaces
293                          * with the same MAC address.
294                          */
295                         if (!ether_addr_equal(sdata->vif.addr,
296                                               nsdata->vif.addr))
297                                 continue;
298 
299                         /*
300                          * check whether it may have the same address
301                          */
302                         if (!identical_mac_addr_allowed(iftype,
303                                                         nsdata->vif.type))
304                                 return -ENOTUNIQ;
305 
306                         /*
307                          * can only add VLANs to enabled APs
308                          */
309                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
310                             nsdata->vif.type == NL80211_IFTYPE_AP)
311                                 sdata->bss = &nsdata->u.ap;
312                 }
313         }
314 
315         mutex_lock(&local->chanctx_mtx);
316         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
317         mutex_unlock(&local->chanctx_mtx);
318         return ret;
319 }
320 
321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
322                                   enum nl80211_iftype iftype)
323 {
324         int n_queues = sdata->local->hw.queues;
325         int i;
326 
327         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
328                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
330                                          IEEE80211_INVAL_HW_QUEUE))
331                                 return -EINVAL;
332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
333                                          n_queues))
334                                 return -EINVAL;
335                 }
336         }
337 
338         if ((iftype != NL80211_IFTYPE_AP &&
339              iftype != NL80211_IFTYPE_P2P_GO &&
340              iftype != NL80211_IFTYPE_MESH_POINT) ||
341             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
342                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
343                 return 0;
344         }
345 
346         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
347                 return -EINVAL;
348 
349         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
350                 return -EINVAL;
351 
352         return 0;
353 }
354 
355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
356                                     const int offset)
357 {
358         struct ieee80211_local *local = sdata->local;
359         u32 flags = sdata->u.mntr_flags;
360 
361 #define ADJUST(_f, _s)  do {                                    \
362         if (flags & MONITOR_FLAG_##_f)                          \
363                 local->fif_##_s += offset;                      \
364         } while (0)
365 
366         ADJUST(FCSFAIL, fcsfail);
367         ADJUST(PLCPFAIL, plcpfail);
368         ADJUST(CONTROL, control);
369         ADJUST(CONTROL, pspoll);
370         ADJUST(OTHER_BSS, other_bss);
371 
372 #undef ADJUST
373 }
374 
375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
376 {
377         struct ieee80211_local *local = sdata->local;
378         int i;
379 
380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
381                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
382                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
383                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
384                         sdata->vif.hw_queue[i] = i;
385                 else
386                         sdata->vif.hw_queue[i] = 0;
387         }
388         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
389 }
390 
391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
392 {
393         struct ieee80211_sub_if_data *sdata;
394         int ret;
395 
396         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
397                 return 0;
398 
399         ASSERT_RTNL();
400 
401         if (local->monitor_sdata)
402                 return 0;
403 
404         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
405         if (!sdata)
406                 return -ENOMEM;
407 
408         /* set up data */
409         sdata->local = local;
410         sdata->vif.type = NL80211_IFTYPE_MONITOR;
411         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
412                  wiphy_name(local->hw.wiphy));
413         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
414 
415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
416 
417         ieee80211_set_default_queues(sdata);
418 
419         ret = drv_add_interface(local, sdata);
420         if (WARN_ON(ret)) {
421                 /* ok .. stupid driver, it asked for this! */
422                 kfree(sdata);
423                 return ret;
424         }
425 
426         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
427         if (ret) {
428                 kfree(sdata);
429                 return ret;
430         }
431 
432         mutex_lock(&local->iflist_mtx);
433         rcu_assign_pointer(local->monitor_sdata, sdata);
434         mutex_unlock(&local->iflist_mtx);
435 
436         mutex_lock(&local->mtx);
437         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
438                                         IEEE80211_CHANCTX_EXCLUSIVE);
439         mutex_unlock(&local->mtx);
440         if (ret) {
441                 mutex_lock(&local->iflist_mtx);
442                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
443                 mutex_unlock(&local->iflist_mtx);
444                 synchronize_net();
445                 drv_remove_interface(local, sdata);
446                 kfree(sdata);
447                 return ret;
448         }
449 
450         return 0;
451 }
452 
453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
454 {
455         struct ieee80211_sub_if_data *sdata;
456 
457         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
458                 return;
459 
460         ASSERT_RTNL();
461 
462         mutex_lock(&local->iflist_mtx);
463 
464         sdata = rcu_dereference_protected(local->monitor_sdata,
465                                           lockdep_is_held(&local->iflist_mtx));
466         if (!sdata) {
467                 mutex_unlock(&local->iflist_mtx);
468                 return;
469         }
470 
471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
472         mutex_unlock(&local->iflist_mtx);
473 
474         synchronize_net();
475 
476         mutex_lock(&local->mtx);
477         ieee80211_vif_release_channel(sdata);
478         mutex_unlock(&local->mtx);
479 
480         drv_remove_interface(local, sdata);
481 
482         kfree(sdata);
483 }
484 
485 /*
486  * NOTE: Be very careful when changing this function, it must NOT return
487  * an error on interface type changes that have been pre-checked, so most
488  * checks should be in ieee80211_check_concurrent_iface.
489  */
490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
491 {
492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
493         struct net_device *dev = wdev->netdev;
494         struct ieee80211_local *local = sdata->local;
495         struct sta_info *sta;
496         u32 changed = 0;
497         int res;
498         u32 hw_reconf_flags = 0;
499 
500         switch (sdata->vif.type) {
501         case NL80211_IFTYPE_WDS:
502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
503                         return -ENOLINK;
504                 break;
505         case NL80211_IFTYPE_AP_VLAN: {
506                 struct ieee80211_sub_if_data *master;
507 
508                 if (!sdata->bss)
509                         return -ENOLINK;
510 
511                 mutex_lock(&local->mtx);
512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
513                 mutex_unlock(&local->mtx);
514 
515                 master = container_of(sdata->bss,
516                                       struct ieee80211_sub_if_data, u.ap);
517                 sdata->control_port_protocol =
518                         master->control_port_protocol;
519                 sdata->control_port_no_encrypt =
520                         master->control_port_no_encrypt;
521                 sdata->vif.cab_queue = master->vif.cab_queue;
522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
523                        sizeof(sdata->vif.hw_queue));
524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
525                 break;
526                 }
527         case NL80211_IFTYPE_AP:
528                 sdata->bss = &sdata->u.ap;
529                 break;
530         case NL80211_IFTYPE_MESH_POINT:
531         case NL80211_IFTYPE_STATION:
532         case NL80211_IFTYPE_MONITOR:
533         case NL80211_IFTYPE_ADHOC:
534         case NL80211_IFTYPE_P2P_DEVICE:
535         case NL80211_IFTYPE_OCB:
536                 /* no special treatment */
537                 break;
538         case NL80211_IFTYPE_UNSPECIFIED:
539         case NUM_NL80211_IFTYPES:
540         case NL80211_IFTYPE_P2P_CLIENT:
541         case NL80211_IFTYPE_P2P_GO:
542                 /* cannot happen */
543                 WARN_ON(1);
544                 break;
545         }
546 
547         if (local->open_count == 0) {
548                 res = drv_start(local);
549                 if (res)
550                         goto err_del_bss;
551                 /* we're brought up, everything changes */
552                 hw_reconf_flags = ~0;
553                 ieee80211_led_radio(local, true);
554                 ieee80211_mod_tpt_led_trig(local,
555                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
556         }
557 
558         /*
559          * Copy the hopefully now-present MAC address to
560          * this interface, if it has the special null one.
561          */
562         if (dev && is_zero_ether_addr(dev->dev_addr)) {
563                 memcpy(dev->dev_addr,
564                        local->hw.wiphy->perm_addr,
565                        ETH_ALEN);
566                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
567 
568                 if (!is_valid_ether_addr(dev->dev_addr)) {
569                         res = -EADDRNOTAVAIL;
570                         goto err_stop;
571                 }
572         }
573 
574         switch (sdata->vif.type) {
575         case NL80211_IFTYPE_AP_VLAN:
576                 /* no need to tell driver, but set carrier and chanctx */
577                 if (rtnl_dereference(sdata->bss->beacon)) {
578                         ieee80211_vif_vlan_copy_chanctx(sdata);
579                         netif_carrier_on(dev);
580                 } else {
581                         netif_carrier_off(dev);
582                 }
583                 break;
584         case NL80211_IFTYPE_MONITOR:
585                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
586                         local->cooked_mntrs++;
587                         break;
588                 }
589 
590                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
591                         res = drv_add_interface(local, sdata);
592                         if (res)
593                                 goto err_stop;
594                 } else if (local->monitors == 0 && local->open_count == 0) {
595                         res = ieee80211_add_virtual_monitor(local);
596                         if (res)
597                                 goto err_stop;
598                 }
599 
600                 /* must be before the call to ieee80211_configure_filter */
601                 local->monitors++;
602                 if (local->monitors == 1) {
603                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
604                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
605                 }
606 
607                 ieee80211_adjust_monitor_flags(sdata, 1);
608                 ieee80211_configure_filter(local);
609                 mutex_lock(&local->mtx);
610                 ieee80211_recalc_idle(local);
611                 mutex_unlock(&local->mtx);
612 
613                 netif_carrier_on(dev);
614                 break;
615         default:
616                 if (coming_up) {
617                         ieee80211_del_virtual_monitor(local);
618 
619                         res = drv_add_interface(local, sdata);
620                         if (res)
621                                 goto err_stop;
622                         res = ieee80211_check_queues(sdata,
623                                 ieee80211_vif_type_p2p(&sdata->vif));
624                         if (res)
625                                 goto err_del_interface;
626                 }
627 
628                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
629                         local->fif_pspoll++;
630                         local->fif_probe_req++;
631 
632                         ieee80211_configure_filter(local);
633                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
634                         local->fif_probe_req++;
635                 }
636 
637                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
638                         changed |= ieee80211_reset_erp_info(sdata);
639                 ieee80211_bss_info_change_notify(sdata, changed);
640 
641                 switch (sdata->vif.type) {
642                 case NL80211_IFTYPE_STATION:
643                 case NL80211_IFTYPE_ADHOC:
644                 case NL80211_IFTYPE_AP:
645                 case NL80211_IFTYPE_MESH_POINT:
646                 case NL80211_IFTYPE_OCB:
647                         netif_carrier_off(dev);
648                         break;
649                 case NL80211_IFTYPE_WDS:
650                 case NL80211_IFTYPE_P2P_DEVICE:
651                         break;
652                 default:
653                         /* not reached */
654                         WARN_ON(1);
655                 }
656 
657                 /*
658                  * set default queue parameters so drivers don't
659                  * need to initialise the hardware if the hardware
660                  * doesn't start up with sane defaults
661                  */
662                 ieee80211_set_wmm_default(sdata, true);
663         }
664 
665         set_bit(SDATA_STATE_RUNNING, &sdata->state);
666 
667         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
668                 /* Create STA entry for the WDS peer */
669                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
670                                      GFP_KERNEL);
671                 if (!sta) {
672                         res = -ENOMEM;
673                         goto err_del_interface;
674                 }
675 
676                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
677                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
678                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
679 
680                 res = sta_info_insert(sta);
681                 if (res) {
682                         /* STA has been freed */
683                         goto err_del_interface;
684                 }
685 
686                 rate_control_rate_init(sta);
687                 netif_carrier_on(dev);
688         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
689                 rcu_assign_pointer(local->p2p_sdata, sdata);
690         }
691 
692         /*
693          * set_multicast_list will be invoked by the networking core
694          * which will check whether any increments here were done in
695          * error and sync them down to the hardware as filter flags.
696          */
697         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
698                 atomic_inc(&local->iff_allmultis);
699 
700         if (sdata->flags & IEEE80211_SDATA_PROMISC)
701                 atomic_inc(&local->iff_promiscs);
702 
703         if (coming_up)
704                 local->open_count++;
705 
706         if (hw_reconf_flags)
707                 ieee80211_hw_config(local, hw_reconf_flags);
708 
709         ieee80211_recalc_ps(local, -1);
710 
711         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
712             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
713                 /* XXX: for AP_VLAN, actually track AP queues */
714                 netif_tx_start_all_queues(dev);
715         } else if (dev) {
716                 unsigned long flags;
717                 int n_acs = IEEE80211_NUM_ACS;
718                 int ac;
719 
720                 if (local->hw.queues < IEEE80211_NUM_ACS)
721                         n_acs = 1;
722 
723                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
724                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
725                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
726                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
727                         for (ac = 0; ac < n_acs; ac++) {
728                                 int ac_queue = sdata->vif.hw_queue[ac];
729 
730                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
731                                     skb_queue_empty(&local->pending[ac_queue]))
732                                         netif_start_subqueue(dev, ac);
733                         }
734                 }
735                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
736         }
737 
738         return 0;
739  err_del_interface:
740         drv_remove_interface(local, sdata);
741  err_stop:
742         if (!local->open_count)
743                 drv_stop(local);
744  err_del_bss:
745         sdata->bss = NULL;
746         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
747                 mutex_lock(&local->mtx);
748                 list_del(&sdata->u.vlan.list);
749                 mutex_unlock(&local->mtx);
750         }
751         /* might already be clear but that doesn't matter */
752         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
753         return res;
754 }
755 
756 static int ieee80211_open(struct net_device *dev)
757 {
758         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
759         int err;
760 
761         /* fail early if user set an invalid address */
762         if (!is_valid_ether_addr(dev->dev_addr))
763                 return -EADDRNOTAVAIL;
764 
765         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
766         if (err)
767                 return err;
768 
769         return ieee80211_do_open(&sdata->wdev, true);
770 }
771 
772 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
773                               bool going_down)
774 {
775         struct ieee80211_local *local = sdata->local;
776         unsigned long flags;
777         struct sk_buff *skb, *tmp;
778         u32 hw_reconf_flags = 0;
779         int i, flushed;
780         struct ps_data *ps;
781         struct cfg80211_chan_def chandef;
782         bool cancel_scan;
783 
784         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
785 
786         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
787         if (cancel_scan)
788                 ieee80211_scan_cancel(local);
789 
790         /*
791          * Stop TX on this interface first.
792          */
793         if (sdata->dev)
794                 netif_tx_stop_all_queues(sdata->dev);
795 
796         ieee80211_roc_purge(local, sdata);
797 
798         switch (sdata->vif.type) {
799         case NL80211_IFTYPE_STATION:
800                 ieee80211_mgd_stop(sdata);
801                 break;
802         case NL80211_IFTYPE_ADHOC:
803                 ieee80211_ibss_stop(sdata);
804                 break;
805         case NL80211_IFTYPE_AP:
806                 cancel_work_sync(&sdata->u.ap.request_smps_work);
807                 break;
808         default:
809                 break;
810         }
811 
812         /*
813          * Remove all stations associated with this interface.
814          *
815          * This must be done before calling ops->remove_interface()
816          * because otherwise we can later invoke ops->sta_notify()
817          * whenever the STAs are removed, and that invalidates driver
818          * assumptions about always getting a vif pointer that is valid
819          * (because if we remove a STA after ops->remove_interface()
820          * the driver will have removed the vif info already!)
821          *
822          * This is relevant only in WDS mode, in all other modes we've
823          * already removed all stations when disconnecting or similar,
824          * so warn otherwise.
825          */
826         flushed = sta_info_flush(sdata);
827         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
828                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
829 
830         /* don't count this interface for promisc/allmulti while it is down */
831         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
832                 atomic_dec(&local->iff_allmultis);
833 
834         if (sdata->flags & IEEE80211_SDATA_PROMISC)
835                 atomic_dec(&local->iff_promiscs);
836 
837         if (sdata->vif.type == NL80211_IFTYPE_AP) {
838                 local->fif_pspoll--;
839                 local->fif_probe_req--;
840         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
841                 local->fif_probe_req--;
842         }
843 
844         if (sdata->dev) {
845                 netif_addr_lock_bh(sdata->dev);
846                 spin_lock_bh(&local->filter_lock);
847                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
848                                  sdata->dev->addr_len);
849                 spin_unlock_bh(&local->filter_lock);
850                 netif_addr_unlock_bh(sdata->dev);
851         }
852 
853         del_timer_sync(&local->dynamic_ps_timer);
854         cancel_work_sync(&local->dynamic_ps_enable_work);
855 
856         cancel_work_sync(&sdata->recalc_smps);
857         sdata_lock(sdata);
858         mutex_lock(&local->mtx);
859         sdata->vif.csa_active = false;
860         if (sdata->vif.type == NL80211_IFTYPE_STATION)
861                 sdata->u.mgd.csa_waiting_bcn = false;
862         if (sdata->csa_block_tx) {
863                 ieee80211_wake_vif_queues(local, sdata,
864                                           IEEE80211_QUEUE_STOP_REASON_CSA);
865                 sdata->csa_block_tx = false;
866         }
867         mutex_unlock(&local->mtx);
868         sdata_unlock(sdata);
869 
870         cancel_work_sync(&sdata->csa_finalize_work);
871 
872         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
873 
874         if (sdata->wdev.cac_started) {
875                 chandef = sdata->vif.bss_conf.chandef;
876                 WARN_ON(local->suspended);
877                 mutex_lock(&local->mtx);
878                 ieee80211_vif_release_channel(sdata);
879                 mutex_unlock(&local->mtx);
880                 cfg80211_cac_event(sdata->dev, &chandef,
881                                    NL80211_RADAR_CAC_ABORTED,
882                                    GFP_KERNEL);
883         }
884 
885         /* APs need special treatment */
886         if (sdata->vif.type == NL80211_IFTYPE_AP) {
887                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
888 
889                 /* down all dependent devices, that is VLANs */
890                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
891                                          u.vlan.list)
892                         dev_close(vlan->dev);
893                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
894         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
895                 /* remove all packets in parent bc_buf pointing to this dev */
896                 ps = &sdata->bss->ps;
897 
898                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
899                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
900                         if (skb->dev == sdata->dev) {
901                                 __skb_unlink(skb, &ps->bc_buf);
902                                 local->total_ps_buffered--;
903                                 ieee80211_free_txskb(&local->hw, skb);
904                         }
905                 }
906                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
907         }
908 
909         if (going_down)
910                 local->open_count--;
911 
912         switch (sdata->vif.type) {
913         case NL80211_IFTYPE_AP_VLAN:
914                 mutex_lock(&local->mtx);
915                 list_del(&sdata->u.vlan.list);
916                 mutex_unlock(&local->mtx);
917                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
918                 /* see comment in the default case below */
919                 ieee80211_free_keys(sdata, true);
920                 /* no need to tell driver */
921                 break;
922         case NL80211_IFTYPE_MONITOR:
923                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
924                         local->cooked_mntrs--;
925                         break;
926                 }
927 
928                 local->monitors--;
929                 if (local->monitors == 0) {
930                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
931                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
932                 }
933 
934                 ieee80211_adjust_monitor_flags(sdata, -1);
935                 break;
936         case NL80211_IFTYPE_P2P_DEVICE:
937                 /* relies on synchronize_rcu() below */
938                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
939                 /* fall through */
940         default:
941                 cancel_work_sync(&sdata->work);
942                 /*
943                  * When we get here, the interface is marked down.
944                  * Free the remaining keys, if there are any
945                  * (which can happen in AP mode if userspace sets
946                  * keys before the interface is operating, and maybe
947                  * also in WDS mode)
948                  *
949                  * Force the key freeing to always synchronize_net()
950                  * to wait for the RX path in case it is using this
951                  * interface enqueuing frames at this very time on
952                  * another CPU.
953                  */
954                 ieee80211_free_keys(sdata, true);
955                 skb_queue_purge(&sdata->skb_queue);
956         }
957 
958         sdata->bss = NULL;
959 
960         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
961         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
962                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
963                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
964                         if (info->control.vif == &sdata->vif) {
965                                 __skb_unlink(skb, &local->pending[i]);
966                                 ieee80211_free_txskb(&local->hw, skb);
967                         }
968                 }
969         }
970         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
971 
972         if (local->open_count == 0)
973                 ieee80211_clear_tx_pending(local);
974 
975         /*
976          * If the interface goes down while suspended, presumably because
977          * the device was unplugged and that happens before our resume,
978          * then the driver is already unconfigured and the remainder of
979          * this function isn't needed.
980          * XXX: what about WoWLAN? If the device has software state, e.g.
981          *      memory allocated, it might expect teardown commands from
982          *      mac80211 here?
983          */
984         if (local->suspended) {
985                 WARN_ON(local->wowlan);
986                 WARN_ON(rtnl_dereference(local->monitor_sdata));
987                 return;
988         }
989 
990         switch (sdata->vif.type) {
991         case NL80211_IFTYPE_AP_VLAN:
992                 break;
993         case NL80211_IFTYPE_MONITOR:
994                 if (local->monitors == 0)
995                         ieee80211_del_virtual_monitor(local);
996 
997                 mutex_lock(&local->mtx);
998                 ieee80211_recalc_idle(local);
999                 mutex_unlock(&local->mtx);
1000 
1001                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1002                         break;
1003 
1004                 /* fall through */
1005         default:
1006                 if (going_down)
1007                         drv_remove_interface(local, sdata);
1008         }
1009 
1010         ieee80211_recalc_ps(local, -1);
1011 
1012         if (cancel_scan)
1013                 flush_delayed_work(&local->scan_work);
1014 
1015         if (local->open_count == 0) {
1016                 ieee80211_stop_device(local);
1017 
1018                 /* no reconfiguring after stop! */
1019                 return;
1020         }
1021 
1022         /* do after stop to avoid reconfiguring when we stop anyway */
1023         ieee80211_configure_filter(local);
1024         ieee80211_hw_config(local, hw_reconf_flags);
1025 
1026         if (local->monitors == local->open_count)
1027                 ieee80211_add_virtual_monitor(local);
1028 }
1029 
1030 static int ieee80211_stop(struct net_device *dev)
1031 {
1032         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1033 
1034         ieee80211_do_stop(sdata, true);
1035 
1036         return 0;
1037 }
1038 
1039 static void ieee80211_set_multicast_list(struct net_device *dev)
1040 {
1041         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1042         struct ieee80211_local *local = sdata->local;
1043         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1044 
1045         allmulti = !!(dev->flags & IFF_ALLMULTI);
1046         promisc = !!(dev->flags & IFF_PROMISC);
1047         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1048         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1049 
1050         if (allmulti != sdata_allmulti) {
1051                 if (dev->flags & IFF_ALLMULTI)
1052                         atomic_inc(&local->iff_allmultis);
1053                 else
1054                         atomic_dec(&local->iff_allmultis);
1055                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1056         }
1057 
1058         if (promisc != sdata_promisc) {
1059                 if (dev->flags & IFF_PROMISC)
1060                         atomic_inc(&local->iff_promiscs);
1061                 else
1062                         atomic_dec(&local->iff_promiscs);
1063                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1064         }
1065         spin_lock_bh(&local->filter_lock);
1066         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1067         spin_unlock_bh(&local->filter_lock);
1068         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1069 }
1070 
1071 /*
1072  * Called when the netdev is removed or, by the code below, before
1073  * the interface type changes.
1074  */
1075 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1076 {
1077         int i;
1078 
1079         /* free extra data */
1080         ieee80211_free_keys(sdata, false);
1081 
1082         ieee80211_debugfs_remove_netdev(sdata);
1083 
1084         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1085                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1086         sdata->fragment_next = 0;
1087 
1088         if (ieee80211_vif_is_mesh(&sdata->vif))
1089                 mesh_rmc_free(sdata);
1090 }
1091 
1092 static void ieee80211_uninit(struct net_device *dev)
1093 {
1094         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1095 }
1096 
1097 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1098                                          struct sk_buff *skb,
1099                                          void *accel_priv,
1100                                          select_queue_fallback_t fallback)
1101 {
1102         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1103 }
1104 
1105 static const struct net_device_ops ieee80211_dataif_ops = {
1106         .ndo_open               = ieee80211_open,
1107         .ndo_stop               = ieee80211_stop,
1108         .ndo_uninit             = ieee80211_uninit,
1109         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1110         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1111         .ndo_change_mtu         = ieee80211_change_mtu,
1112         .ndo_set_mac_address    = ieee80211_change_mac,
1113         .ndo_select_queue       = ieee80211_netdev_select_queue,
1114 };
1115 
1116 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1117                                           struct sk_buff *skb,
1118                                           void *accel_priv,
1119                                           select_queue_fallback_t fallback)
1120 {
1121         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1122         struct ieee80211_local *local = sdata->local;
1123         struct ieee80211_hdr *hdr;
1124         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1125 
1126         if (local->hw.queues < IEEE80211_NUM_ACS)
1127                 return 0;
1128 
1129         if (skb->len < 4 ||
1130             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1131                 return 0; /* doesn't matter, frame will be dropped */
1132 
1133         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1134 
1135         return ieee80211_select_queue_80211(sdata, skb, hdr);
1136 }
1137 
1138 static const struct net_device_ops ieee80211_monitorif_ops = {
1139         .ndo_open               = ieee80211_open,
1140         .ndo_stop               = ieee80211_stop,
1141         .ndo_uninit             = ieee80211_uninit,
1142         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1143         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1144         .ndo_change_mtu         = ieee80211_change_mtu,
1145         .ndo_set_mac_address    = ieee80211_change_mac,
1146         .ndo_select_queue       = ieee80211_monitor_select_queue,
1147 };
1148 
1149 static void ieee80211_if_setup(struct net_device *dev)
1150 {
1151         ether_setup(dev);
1152         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1153         dev->netdev_ops = &ieee80211_dataif_ops;
1154         dev->destructor = free_netdev;
1155 }
1156 
1157 static void ieee80211_iface_work(struct work_struct *work)
1158 {
1159         struct ieee80211_sub_if_data *sdata =
1160                 container_of(work, struct ieee80211_sub_if_data, work);
1161         struct ieee80211_local *local = sdata->local;
1162         struct sk_buff *skb;
1163         struct sta_info *sta;
1164         struct ieee80211_ra_tid *ra_tid;
1165         struct ieee80211_rx_agg *rx_agg;
1166 
1167         if (!ieee80211_sdata_running(sdata))
1168                 return;
1169 
1170         if (local->scanning)
1171                 return;
1172 
1173         if (!ieee80211_can_run_worker(local))
1174                 return;
1175 
1176         /* first process frames */
1177         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1178                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1179 
1180                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1181                         ra_tid = (void *)&skb->cb;
1182                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1183                                                  ra_tid->tid);
1184                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1185                         ra_tid = (void *)&skb->cb;
1186                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1187                                                 ra_tid->tid);
1188                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1189                         rx_agg = (void *)&skb->cb;
1190                         mutex_lock(&local->sta_mtx);
1191                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1192                         if (sta)
1193                                 __ieee80211_start_rx_ba_session(sta,
1194                                                 0, 0, 0, 1, rx_agg->tid,
1195                                                 IEEE80211_MAX_AMPDU_BUF,
1196                                                 false, true);
1197                         mutex_unlock(&local->sta_mtx);
1198                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1199                         rx_agg = (void *)&skb->cb;
1200                         mutex_lock(&local->sta_mtx);
1201                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1202                         if (sta)
1203                                 __ieee80211_stop_rx_ba_session(sta,
1204                                                         rx_agg->tid,
1205                                                         WLAN_BACK_RECIPIENT, 0,
1206                                                         false);
1207                         mutex_unlock(&local->sta_mtx);
1208                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1209                         ieee80211_process_tdls_channel_switch(sdata, skb);
1210                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1211                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1212                         int len = skb->len;
1213 
1214                         mutex_lock(&local->sta_mtx);
1215                         sta = sta_info_get_bss(sdata, mgmt->sa);
1216                         if (sta) {
1217                                 switch (mgmt->u.action.u.addba_req.action_code) {
1218                                 case WLAN_ACTION_ADDBA_REQ:
1219                                         ieee80211_process_addba_request(
1220                                                         local, sta, mgmt, len);
1221                                         break;
1222                                 case WLAN_ACTION_ADDBA_RESP:
1223                                         ieee80211_process_addba_resp(local, sta,
1224                                                                      mgmt, len);
1225                                         break;
1226                                 case WLAN_ACTION_DELBA:
1227                                         ieee80211_process_delba(sdata, sta,
1228                                                                 mgmt, len);
1229                                         break;
1230                                 default:
1231                                         WARN_ON(1);
1232                                         break;
1233                                 }
1234                         }
1235                         mutex_unlock(&local->sta_mtx);
1236                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1237                         struct ieee80211_hdr *hdr = (void *)mgmt;
1238                         /*
1239                          * So the frame isn't mgmt, but frame_control
1240                          * is at the right place anyway, of course, so
1241                          * the if statement is correct.
1242                          *
1243                          * Warn if we have other data frame types here,
1244                          * they must not get here.
1245                          */
1246                         WARN_ON(hdr->frame_control &
1247                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1248                         WARN_ON(!(hdr->seq_ctrl &
1249                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1250                         /*
1251                          * This was a fragment of a frame, received while
1252                          * a block-ack session was active. That cannot be
1253                          * right, so terminate the session.
1254                          */
1255                         mutex_lock(&local->sta_mtx);
1256                         sta = sta_info_get_bss(sdata, mgmt->sa);
1257                         if (sta) {
1258                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1259                                                 IEEE80211_QOS_CTL_TID_MASK;
1260 
1261                                 __ieee80211_stop_rx_ba_session(
1262                                         sta, tid, WLAN_BACK_RECIPIENT,
1263                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1264                                         true);
1265                         }
1266                         mutex_unlock(&local->sta_mtx);
1267                 } else switch (sdata->vif.type) {
1268                 case NL80211_IFTYPE_STATION:
1269                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1270                         break;
1271                 case NL80211_IFTYPE_ADHOC:
1272                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1273                         break;
1274                 case NL80211_IFTYPE_MESH_POINT:
1275                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1276                                 break;
1277                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1278                         break;
1279                 default:
1280                         WARN(1, "frame for unexpected interface type");
1281                         break;
1282                 }
1283 
1284                 kfree_skb(skb);
1285         }
1286 
1287         /* then other type-dependent work */
1288         switch (sdata->vif.type) {
1289         case NL80211_IFTYPE_STATION:
1290                 ieee80211_sta_work(sdata);
1291                 break;
1292         case NL80211_IFTYPE_ADHOC:
1293                 ieee80211_ibss_work(sdata);
1294                 break;
1295         case NL80211_IFTYPE_MESH_POINT:
1296                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1297                         break;
1298                 ieee80211_mesh_work(sdata);
1299                 break;
1300         case NL80211_IFTYPE_OCB:
1301                 ieee80211_ocb_work(sdata);
1302                 break;
1303         default:
1304                 break;
1305         }
1306 }
1307 
1308 static void ieee80211_recalc_smps_work(struct work_struct *work)
1309 {
1310         struct ieee80211_sub_if_data *sdata =
1311                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1312 
1313         ieee80211_recalc_smps(sdata);
1314 }
1315 
1316 /*
1317  * Helper function to initialise an interface to a specific type.
1318  */
1319 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1320                                   enum nl80211_iftype type)
1321 {
1322         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1323                                                     0xff, 0xff, 0xff};
1324 
1325         /* clear type-dependent union */
1326         memset(&sdata->u, 0, sizeof(sdata->u));
1327 
1328         /* and set some type-dependent values */
1329         sdata->vif.type = type;
1330         sdata->vif.p2p = false;
1331         sdata->wdev.iftype = type;
1332 
1333         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1334         sdata->control_port_no_encrypt = false;
1335         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1336         sdata->vif.bss_conf.idle = true;
1337 
1338         sdata->noack_map = 0;
1339 
1340         /* only monitor/p2p-device differ */
1341         if (sdata->dev) {
1342                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1343                 sdata->dev->type = ARPHRD_ETHER;
1344         }
1345 
1346         skb_queue_head_init(&sdata->skb_queue);
1347         INIT_WORK(&sdata->work, ieee80211_iface_work);
1348         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1349         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1350         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1351         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1352 
1353         switch (type) {
1354         case NL80211_IFTYPE_P2P_GO:
1355                 type = NL80211_IFTYPE_AP;
1356                 sdata->vif.type = type;
1357                 sdata->vif.p2p = true;
1358                 /* fall through */
1359         case NL80211_IFTYPE_AP:
1360                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1361                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1362                 INIT_WORK(&sdata->u.ap.request_smps_work,
1363                           ieee80211_request_smps_ap_work);
1364                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1365                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1366                 break;
1367         case NL80211_IFTYPE_P2P_CLIENT:
1368                 type = NL80211_IFTYPE_STATION;
1369                 sdata->vif.type = type;
1370                 sdata->vif.p2p = true;
1371                 /* fall through */
1372         case NL80211_IFTYPE_STATION:
1373                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1374                 ieee80211_sta_setup_sdata(sdata);
1375                 break;
1376         case NL80211_IFTYPE_OCB:
1377                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1378                 ieee80211_ocb_setup_sdata(sdata);
1379                 break;
1380         case NL80211_IFTYPE_ADHOC:
1381                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1382                 ieee80211_ibss_setup_sdata(sdata);
1383                 break;
1384         case NL80211_IFTYPE_MESH_POINT:
1385                 if (ieee80211_vif_is_mesh(&sdata->vif))
1386                         ieee80211_mesh_init_sdata(sdata);
1387                 break;
1388         case NL80211_IFTYPE_MONITOR:
1389                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1390                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1391                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1392                                       MONITOR_FLAG_OTHER_BSS;
1393                 break;
1394         case NL80211_IFTYPE_WDS:
1395                 sdata->vif.bss_conf.bssid = NULL;
1396                 break;
1397         case NL80211_IFTYPE_AP_VLAN:
1398         case NL80211_IFTYPE_P2P_DEVICE:
1399                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1400                 break;
1401         case NL80211_IFTYPE_UNSPECIFIED:
1402         case NUM_NL80211_IFTYPES:
1403                 BUG();
1404                 break;
1405         }
1406 
1407         ieee80211_debugfs_add_netdev(sdata);
1408 }
1409 
1410 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1411                                            enum nl80211_iftype type)
1412 {
1413         struct ieee80211_local *local = sdata->local;
1414         int ret, err;
1415         enum nl80211_iftype internal_type = type;
1416         bool p2p = false;
1417 
1418         ASSERT_RTNL();
1419 
1420         if (!local->ops->change_interface)
1421                 return -EBUSY;
1422 
1423         switch (sdata->vif.type) {
1424         case NL80211_IFTYPE_AP:
1425         case NL80211_IFTYPE_STATION:
1426         case NL80211_IFTYPE_ADHOC:
1427         case NL80211_IFTYPE_OCB:
1428                 /*
1429                  * Could maybe also all others here?
1430                  * Just not sure how that interacts
1431                  * with the RX/config path e.g. for
1432                  * mesh.
1433                  */
1434                 break;
1435         default:
1436                 return -EBUSY;
1437         }
1438 
1439         switch (type) {
1440         case NL80211_IFTYPE_AP:
1441         case NL80211_IFTYPE_STATION:
1442         case NL80211_IFTYPE_ADHOC:
1443         case NL80211_IFTYPE_OCB:
1444                 /*
1445                  * Could probably support everything
1446                  * but WDS here (WDS do_open can fail
1447                  * under memory pressure, which this
1448                  * code isn't prepared to handle).
1449                  */
1450                 break;
1451         case NL80211_IFTYPE_P2P_CLIENT:
1452                 p2p = true;
1453                 internal_type = NL80211_IFTYPE_STATION;
1454                 break;
1455         case NL80211_IFTYPE_P2P_GO:
1456                 p2p = true;
1457                 internal_type = NL80211_IFTYPE_AP;
1458                 break;
1459         default:
1460                 return -EBUSY;
1461         }
1462 
1463         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1464         if (ret)
1465                 return ret;
1466 
1467         ieee80211_do_stop(sdata, false);
1468 
1469         ieee80211_teardown_sdata(sdata);
1470 
1471         ret = drv_change_interface(local, sdata, internal_type, p2p);
1472         if (ret)
1473                 type = ieee80211_vif_type_p2p(&sdata->vif);
1474 
1475         /*
1476          * Ignore return value here, there's not much we can do since
1477          * the driver changed the interface type internally already.
1478          * The warnings will hopefully make driver authors fix it :-)
1479          */
1480         ieee80211_check_queues(sdata, type);
1481 
1482         ieee80211_setup_sdata(sdata, type);
1483 
1484         err = ieee80211_do_open(&sdata->wdev, false);
1485         WARN(err, "type change: do_open returned %d", err);
1486 
1487         return ret;
1488 }
1489 
1490 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1491                              enum nl80211_iftype type)
1492 {
1493         int ret;
1494 
1495         ASSERT_RTNL();
1496 
1497         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1498                 return 0;
1499 
1500         if (ieee80211_sdata_running(sdata)) {
1501                 ret = ieee80211_runtime_change_iftype(sdata, type);
1502                 if (ret)
1503                         return ret;
1504         } else {
1505                 /* Purge and reset type-dependent state. */
1506                 ieee80211_teardown_sdata(sdata);
1507                 ieee80211_setup_sdata(sdata, type);
1508         }
1509 
1510         /* reset some values that shouldn't be kept across type changes */
1511         sdata->drop_unencrypted = 0;
1512         if (type == NL80211_IFTYPE_STATION)
1513                 sdata->u.mgd.use_4addr = false;
1514 
1515         return 0;
1516 }
1517 
1518 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1519                                        u8 *perm_addr, enum nl80211_iftype type)
1520 {
1521         struct ieee80211_sub_if_data *sdata;
1522         u64 mask, start, addr, val, inc;
1523         u8 *m;
1524         u8 tmp_addr[ETH_ALEN];
1525         int i;
1526 
1527         /* default ... something at least */
1528         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1529 
1530         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1531             local->hw.wiphy->n_addresses <= 1)
1532                 return;
1533 
1534         mutex_lock(&local->iflist_mtx);
1535 
1536         switch (type) {
1537         case NL80211_IFTYPE_MONITOR:
1538                 /* doesn't matter */
1539                 break;
1540         case NL80211_IFTYPE_WDS:
1541         case NL80211_IFTYPE_AP_VLAN:
1542                 /* match up with an AP interface */
1543                 list_for_each_entry(sdata, &local->interfaces, list) {
1544                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1545                                 continue;
1546                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1547                         break;
1548                 }
1549                 /* keep default if no AP interface present */
1550                 break;
1551         case NL80211_IFTYPE_P2P_CLIENT:
1552         case NL80211_IFTYPE_P2P_GO:
1553                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1554                         list_for_each_entry(sdata, &local->interfaces, list) {
1555                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1556                                         continue;
1557                                 if (!ieee80211_sdata_running(sdata))
1558                                         continue;
1559                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1560                                 goto out_unlock;
1561                         }
1562                 }
1563                 /* otherwise fall through */
1564         default:
1565                 /* assign a new address if possible -- try n_addresses first */
1566                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1567                         bool used = false;
1568 
1569                         list_for_each_entry(sdata, &local->interfaces, list) {
1570                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1571                                                      sdata->vif.addr)) {
1572                                         used = true;
1573                                         break;
1574                                 }
1575                         }
1576 
1577                         if (!used) {
1578                                 memcpy(perm_addr,
1579                                        local->hw.wiphy->addresses[i].addr,
1580                                        ETH_ALEN);
1581                                 break;
1582                         }
1583                 }
1584 
1585                 /* try mask if available */
1586                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1587                         break;
1588 
1589                 m = local->hw.wiphy->addr_mask;
1590                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1591                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1592                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1593 
1594                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1595                         /* not a contiguous mask ... not handled now! */
1596                         pr_info("not contiguous\n");
1597                         break;
1598                 }
1599 
1600                 /*
1601                  * Pick address of existing interface in case user changed
1602                  * MAC address manually, default to perm_addr.
1603                  */
1604                 m = local->hw.wiphy->perm_addr;
1605                 list_for_each_entry(sdata, &local->interfaces, list) {
1606                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1607                                 continue;
1608                         m = sdata->vif.addr;
1609                         break;
1610                 }
1611                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1612                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1613                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1614 
1615                 inc = 1ULL<<__ffs64(mask);
1616                 val = (start & mask);
1617                 addr = (start & ~mask) | (val & mask);
1618                 do {
1619                         bool used = false;
1620 
1621                         tmp_addr[5] = addr >> 0*8;
1622                         tmp_addr[4] = addr >> 1*8;
1623                         tmp_addr[3] = addr >> 2*8;
1624                         tmp_addr[2] = addr >> 3*8;
1625                         tmp_addr[1] = addr >> 4*8;
1626                         tmp_addr[0] = addr >> 5*8;
1627 
1628                         val += inc;
1629 
1630                         list_for_each_entry(sdata, &local->interfaces, list) {
1631                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1632                                         used = true;
1633                                         break;
1634                                 }
1635                         }
1636 
1637                         if (!used) {
1638                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1639                                 break;
1640                         }
1641                         addr = (start & ~mask) | (val & mask);
1642                 } while (addr != start);
1643 
1644                 break;
1645         }
1646 
1647  out_unlock:
1648         mutex_unlock(&local->iflist_mtx);
1649 }
1650 
1651 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1652                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1653                      struct vif_params *params)
1654 {
1655         struct net_device *ndev = NULL;
1656         struct ieee80211_sub_if_data *sdata = NULL;
1657         int ret, i;
1658         int txqs = 1;
1659 
1660         ASSERT_RTNL();
1661 
1662         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1663                 struct wireless_dev *wdev;
1664 
1665                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1666                                 GFP_KERNEL);
1667                 if (!sdata)
1668                         return -ENOMEM;
1669                 wdev = &sdata->wdev;
1670 
1671                 sdata->dev = NULL;
1672                 strlcpy(sdata->name, name, IFNAMSIZ);
1673                 ieee80211_assign_perm_addr(local, wdev->address, type);
1674                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1675         } else {
1676                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1677                         txqs = IEEE80211_NUM_ACS;
1678 
1679                 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1680                                         name, NET_NAME_UNKNOWN,
1681                                         ieee80211_if_setup, txqs, 1);
1682                 if (!ndev)
1683                         return -ENOMEM;
1684                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1685 
1686                 ndev->needed_headroom = local->tx_headroom +
1687                                         4*6 /* four MAC addresses */
1688                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1689                                         + 6 /* mesh */
1690                                         + 8 /* rfc1042/bridge tunnel */
1691                                         - ETH_HLEN /* ethernet hard_header_len */
1692                                         + IEEE80211_ENCRYPT_HEADROOM;
1693                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1694 
1695                 ret = dev_alloc_name(ndev, ndev->name);
1696                 if (ret < 0) {
1697                         free_netdev(ndev);
1698                         return ret;
1699                 }
1700 
1701                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1702                 if (params && is_valid_ether_addr(params->macaddr))
1703                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1704                 else
1705                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1706                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1707 
1708                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1709                 sdata = netdev_priv(ndev);
1710                 ndev->ieee80211_ptr = &sdata->wdev;
1711                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1712                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1713 
1714                 sdata->dev = ndev;
1715         }
1716 
1717         /* initialise type-independent data */
1718         sdata->wdev.wiphy = local->hw.wiphy;
1719         sdata->local = local;
1720 
1721         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1722                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1723 
1724         INIT_LIST_HEAD(&sdata->key_list);
1725 
1726         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1727                           ieee80211_dfs_cac_timer_work);
1728         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1729                           ieee80211_delayed_tailroom_dec);
1730 
1731         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1732                 struct ieee80211_supported_band *sband;
1733                 sband = local->hw.wiphy->bands[i];
1734                 sdata->rc_rateidx_mask[i] =
1735                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1736                 if (sband)
1737                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1738                                sband->ht_cap.mcs.rx_mask,
1739                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1740                 else
1741                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1742                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1743         }
1744 
1745         ieee80211_set_default_queues(sdata);
1746 
1747         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1748         sdata->user_power_level = local->user_power_level;
1749 
1750         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1751 
1752         /* setup type-dependent data */
1753         ieee80211_setup_sdata(sdata, type);
1754 
1755         if (ndev) {
1756                 if (params) {
1757                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1758                         if (type == NL80211_IFTYPE_STATION)
1759                                 sdata->u.mgd.use_4addr = params->use_4addr;
1760                 }
1761 
1762                 ndev->features |= local->hw.netdev_features;
1763 
1764                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1765 
1766                 ret = register_netdevice(ndev);
1767                 if (ret) {
1768                         free_netdev(ndev);
1769                         return ret;
1770                 }
1771         }
1772 
1773         mutex_lock(&local->iflist_mtx);
1774         list_add_tail_rcu(&sdata->list, &local->interfaces);
1775         mutex_unlock(&local->iflist_mtx);
1776 
1777         if (new_wdev)
1778                 *new_wdev = &sdata->wdev;
1779 
1780         return 0;
1781 }
1782 
1783 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1784 {
1785         ASSERT_RTNL();
1786 
1787         mutex_lock(&sdata->local->iflist_mtx);
1788         list_del_rcu(&sdata->list);
1789         mutex_unlock(&sdata->local->iflist_mtx);
1790 
1791         synchronize_rcu();
1792 
1793         if (sdata->dev) {
1794                 unregister_netdevice(sdata->dev);
1795         } else {
1796                 cfg80211_unregister_wdev(&sdata->wdev);
1797                 kfree(sdata);
1798         }
1799 }
1800 
1801 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1802 {
1803         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1804                 return;
1805         ieee80211_do_stop(sdata, true);
1806         ieee80211_teardown_sdata(sdata);
1807 }
1808 
1809 /*
1810  * Remove all interfaces, may only be called at hardware unregistration
1811  * time because it doesn't do RCU-safe list removals.
1812  */
1813 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1814 {
1815         struct ieee80211_sub_if_data *sdata, *tmp;
1816         LIST_HEAD(unreg_list);
1817         LIST_HEAD(wdev_list);
1818 
1819         ASSERT_RTNL();
1820 
1821         /*
1822          * Close all AP_VLAN interfaces first, as otherwise they
1823          * might be closed while the AP interface they belong to
1824          * is closed, causing unregister_netdevice_many() to crash.
1825          */
1826         list_for_each_entry(sdata, &local->interfaces, list)
1827                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1828                         dev_close(sdata->dev);
1829 
1830         mutex_lock(&local->iflist_mtx);
1831         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1832                 list_del(&sdata->list);
1833 
1834                 if (sdata->dev)
1835                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1836                 else
1837                         list_add(&sdata->list, &wdev_list);
1838         }
1839         mutex_unlock(&local->iflist_mtx);
1840         unregister_netdevice_many(&unreg_list);
1841 
1842         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1843                 list_del(&sdata->list);
1844                 cfg80211_unregister_wdev(&sdata->wdev);
1845                 kfree(sdata);
1846         }
1847 }
1848 
1849 static int netdev_notify(struct notifier_block *nb,
1850                          unsigned long state, void *ptr)
1851 {
1852         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1853         struct ieee80211_sub_if_data *sdata;
1854 
1855         if (state != NETDEV_CHANGENAME)
1856                 return NOTIFY_DONE;
1857 
1858         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1859                 return NOTIFY_DONE;
1860 
1861         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1862                 return NOTIFY_DONE;
1863 
1864         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1865         memcpy(sdata->name, dev->name, IFNAMSIZ);
1866         ieee80211_debugfs_rename_netdev(sdata);
1867 
1868         return NOTIFY_OK;
1869 }
1870 
1871 static struct notifier_block mac80211_netdev_notifier = {
1872         .notifier_call = netdev_notify,
1873 };
1874 
1875 int ieee80211_iface_init(void)
1876 {
1877         return register_netdevice_notifier(&mac80211_netdev_notifier);
1878 }
1879 
1880 void ieee80211_iface_exit(void)
1881 {
1882         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1883 }
1884 

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