Version:  2.0.40 2.2.26 2.4.37 3.3 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

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 {
 78         if (__ieee80211_recalc_txpower(sdata))
 79                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 80 }
 81 
 82 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 83 {
 84         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 85                 return 0;
 86 
 87         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 88         return IEEE80211_CONF_CHANGE_IDLE;
 89 }
 90 
 91 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 92 {
 93         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 94                 return 0;
 95 
 96         ieee80211_flush_queues(local, NULL);
 97 
 98         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 99         return IEEE80211_CONF_CHANGE_IDLE;
100 }
101 
102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
103                                    bool force_active)
104 {
105         bool working, scanning, active;
106         unsigned int led_trig_start = 0, led_trig_stop = 0;
107 
108         lockdep_assert_held(&local->mtx);
109 
110         active = force_active ||
111                  !list_empty(&local->chanctx_list) ||
112                  local->monitors;
113 
114         working = !local->ops->remain_on_channel &&
115                   !list_empty(&local->roc_list);
116 
117         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
118                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
119 
120         if (working || scanning)
121                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
122         else
123                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124 
125         if (active)
126                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
127         else
128                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129 
130         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
131 
132         if (working || scanning || active)
133                 return __ieee80211_idle_off(local);
134         return __ieee80211_idle_on(local);
135 }
136 
137 u32 ieee80211_idle_off(struct ieee80211_local *local)
138 {
139         return __ieee80211_recalc_idle(local, true);
140 }
141 
142 void ieee80211_recalc_idle(struct ieee80211_local *local)
143 {
144         u32 change = __ieee80211_recalc_idle(local, false);
145         if (change)
146                 ieee80211_hw_config(local, change);
147 }
148 
149 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
150 {
151         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
152                 return -EINVAL;
153 
154         dev->mtu = new_mtu;
155         return 0;
156 }
157 
158 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
159                                 bool check_dup)
160 {
161         struct ieee80211_local *local = sdata->local;
162         struct ieee80211_sub_if_data *iter;
163         u64 new, mask, tmp;
164         u8 *m;
165         int ret = 0;
166 
167         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
168                 return 0;
169 
170         m = addr;
171         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174 
175         m = local->hw.wiphy->addr_mask;
176         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
177                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
178                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
179 
180         if (!check_dup)
181                 return ret;
182 
183         mutex_lock(&local->iflist_mtx);
184         list_for_each_entry(iter, &local->interfaces, list) {
185                 if (iter == sdata)
186                         continue;
187 
188                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
189                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
190                         continue;
191 
192                 m = iter->vif.addr;
193                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
194                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
195                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
196 
197                 if ((new & ~mask) != (tmp & ~mask)) {
198                         ret = -EINVAL;
199                         break;
200                 }
201         }
202         mutex_unlock(&local->iflist_mtx);
203 
204         return ret;
205 }
206 
207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
208 {
209         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
210         struct sockaddr *sa = addr;
211         bool check_dup = true;
212         int ret;
213 
214         if (ieee80211_sdata_running(sdata))
215                 return -EBUSY;
216 
217         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
218             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
219                 check_dup = false;
220 
221         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
222         if (ret)
223                 return ret;
224 
225         ret = eth_mac_addr(dev, sa);
226 
227         if (ret == 0)
228                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
229 
230         return ret;
231 }
232 
233 static inline int identical_mac_addr_allowed(int type1, int type2)
234 {
235         return type1 == NL80211_IFTYPE_MONITOR ||
236                 type2 == NL80211_IFTYPE_MONITOR ||
237                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
238                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
239                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
240                 (type1 == NL80211_IFTYPE_WDS &&
241                         (type2 == NL80211_IFTYPE_WDS ||
242                          type2 == NL80211_IFTYPE_AP)) ||
243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
244                 (type1 == NL80211_IFTYPE_AP_VLAN &&
245                         (type2 == NL80211_IFTYPE_AP ||
246                          type2 == NL80211_IFTYPE_AP_VLAN));
247 }
248 
249 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
250                                             enum nl80211_iftype iftype)
251 {
252         struct ieee80211_local *local = sdata->local;
253         struct ieee80211_sub_if_data *nsdata;
254         int ret;
255 
256         ASSERT_RTNL();
257 
258         /* we hold the RTNL here so can safely walk the list */
259         list_for_each_entry(nsdata, &local->interfaces, list) {
260                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
261                         /*
262                          * Only OCB and monitor mode may coexist
263                          */
264                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
265                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
266                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
267                              nsdata->vif.type == NL80211_IFTYPE_OCB))
268                                 return -EBUSY;
269 
270                         /*
271                          * Allow only a single IBSS interface to be up at any
272                          * time. This is restricted because beacon distribution
273                          * cannot work properly if both are in the same IBSS.
274                          *
275                          * To remove this restriction we'd have to disallow them
276                          * from setting the same SSID on different IBSS interfaces
277                          * belonging to the same hardware. Then, however, we're
278                          * faced with having to adopt two different TSF timers...
279                          */
280                         if (iftype == NL80211_IFTYPE_ADHOC &&
281                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
282                                 return -EBUSY;
283                         /*
284                          * will not add another interface while any channel
285                          * switch is active.
286                          */
287                         if (nsdata->vif.csa_active)
288                                 return -EBUSY;
289 
290                         /*
291                          * The remaining checks are only performed for interfaces
292                          * with the same MAC address.
293                          */
294                         if (!ether_addr_equal(sdata->vif.addr,
295                                               nsdata->vif.addr))
296                                 continue;
297 
298                         /*
299                          * check whether it may have the same address
300                          */
301                         if (!identical_mac_addr_allowed(iftype,
302                                                         nsdata->vif.type))
303                                 return -ENOTUNIQ;
304 
305                         /*
306                          * can only add VLANs to enabled APs
307                          */
308                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
309                             nsdata->vif.type == NL80211_IFTYPE_AP)
310                                 sdata->bss = &nsdata->u.ap;
311                 }
312         }
313 
314         mutex_lock(&local->chanctx_mtx);
315         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
316         mutex_unlock(&local->chanctx_mtx);
317         return ret;
318 }
319 
320 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
321                                   enum nl80211_iftype iftype)
322 {
323         int n_queues = sdata->local->hw.queues;
324         int i;
325 
326         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
327                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
329                                          IEEE80211_INVAL_HW_QUEUE))
330                                 return -EINVAL;
331                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
332                                          n_queues))
333                                 return -EINVAL;
334                 }
335         }
336 
337         if ((iftype != NL80211_IFTYPE_AP &&
338              iftype != NL80211_IFTYPE_P2P_GO &&
339              iftype != NL80211_IFTYPE_MESH_POINT) ||
340             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
341                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
342                 return 0;
343         }
344 
345         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
346                 return -EINVAL;
347 
348         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
349                 return -EINVAL;
350 
351         return 0;
352 }
353 
354 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
355                                     const int offset)
356 {
357         struct ieee80211_local *local = sdata->local;
358         u32 flags = sdata->u.mntr_flags;
359 
360 #define ADJUST(_f, _s)  do {                                    \
361         if (flags & MONITOR_FLAG_##_f)                          \
362                 local->fif_##_s += offset;                      \
363         } while (0)
364 
365         ADJUST(FCSFAIL, fcsfail);
366         ADJUST(PLCPFAIL, plcpfail);
367         ADJUST(CONTROL, control);
368         ADJUST(CONTROL, pspoll);
369         ADJUST(OTHER_BSS, other_bss);
370 
371 #undef ADJUST
372 }
373 
374 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
375 {
376         struct ieee80211_local *local = sdata->local;
377         int i;
378 
379         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
380                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
381                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
382                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
383                         sdata->vif.hw_queue[i] = i;
384                 else
385                         sdata->vif.hw_queue[i] = 0;
386         }
387         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
388 }
389 
390 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
391 {
392         struct ieee80211_sub_if_data *sdata;
393         int ret;
394 
395         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
396                 return 0;
397 
398         ASSERT_RTNL();
399 
400         if (local->monitor_sdata)
401                 return 0;
402 
403         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
404         if (!sdata)
405                 return -ENOMEM;
406 
407         /* set up data */
408         sdata->local = local;
409         sdata->vif.type = NL80211_IFTYPE_MONITOR;
410         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
411                  wiphy_name(local->hw.wiphy));
412         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
413 
414         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
415 
416         ieee80211_set_default_queues(sdata);
417 
418         ret = drv_add_interface(local, sdata);
419         if (WARN_ON(ret)) {
420                 /* ok .. stupid driver, it asked for this! */
421                 kfree(sdata);
422                 return ret;
423         }
424 
425         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
426         if (ret) {
427                 kfree(sdata);
428                 return ret;
429         }
430 
431         mutex_lock(&local->iflist_mtx);
432         rcu_assign_pointer(local->monitor_sdata, sdata);
433         mutex_unlock(&local->iflist_mtx);
434 
435         mutex_lock(&local->mtx);
436         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
437                                         IEEE80211_CHANCTX_EXCLUSIVE);
438         mutex_unlock(&local->mtx);
439         if (ret) {
440                 mutex_lock(&local->iflist_mtx);
441                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
442                 mutex_unlock(&local->iflist_mtx);
443                 synchronize_net();
444                 drv_remove_interface(local, sdata);
445                 kfree(sdata);
446                 return ret;
447         }
448 
449         return 0;
450 }
451 
452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
453 {
454         struct ieee80211_sub_if_data *sdata;
455 
456         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
457                 return;
458 
459         ASSERT_RTNL();
460 
461         mutex_lock(&local->iflist_mtx);
462 
463         sdata = rcu_dereference_protected(local->monitor_sdata,
464                                           lockdep_is_held(&local->iflist_mtx));
465         if (!sdata) {
466                 mutex_unlock(&local->iflist_mtx);
467                 return;
468         }
469 
470         RCU_INIT_POINTER(local->monitor_sdata, NULL);
471         mutex_unlock(&local->iflist_mtx);
472 
473         synchronize_net();
474 
475         mutex_lock(&local->mtx);
476         ieee80211_vif_release_channel(sdata);
477         mutex_unlock(&local->mtx);
478 
479         drv_remove_interface(local, sdata);
480 
481         kfree(sdata);
482 }
483 
484 /*
485  * NOTE: Be very careful when changing this function, it must NOT return
486  * an error on interface type changes that have been pre-checked, so most
487  * checks should be in ieee80211_check_concurrent_iface.
488  */
489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
490 {
491         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
492         struct net_device *dev = wdev->netdev;
493         struct ieee80211_local *local = sdata->local;
494         struct sta_info *sta;
495         u32 changed = 0;
496         int res;
497         u32 hw_reconf_flags = 0;
498 
499         switch (sdata->vif.type) {
500         case NL80211_IFTYPE_WDS:
501                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
502                         return -ENOLINK;
503                 break;
504         case NL80211_IFTYPE_AP_VLAN: {
505                 struct ieee80211_sub_if_data *master;
506 
507                 if (!sdata->bss)
508                         return -ENOLINK;
509 
510                 mutex_lock(&local->mtx);
511                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
512                 mutex_unlock(&local->mtx);
513 
514                 master = container_of(sdata->bss,
515                                       struct ieee80211_sub_if_data, u.ap);
516                 sdata->control_port_protocol =
517                         master->control_port_protocol;
518                 sdata->control_port_no_encrypt =
519                         master->control_port_no_encrypt;
520                 sdata->vif.cab_queue = master->vif.cab_queue;
521                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
522                        sizeof(sdata->vif.hw_queue));
523                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
524                 break;
525                 }
526         case NL80211_IFTYPE_AP:
527                 sdata->bss = &sdata->u.ap;
528                 break;
529         case NL80211_IFTYPE_MESH_POINT:
530         case NL80211_IFTYPE_STATION:
531         case NL80211_IFTYPE_MONITOR:
532         case NL80211_IFTYPE_ADHOC:
533         case NL80211_IFTYPE_P2P_DEVICE:
534         case NL80211_IFTYPE_OCB:
535                 /* no special treatment */
536                 break;
537         case NL80211_IFTYPE_UNSPECIFIED:
538         case NUM_NL80211_IFTYPES:
539         case NL80211_IFTYPE_P2P_CLIENT:
540         case NL80211_IFTYPE_P2P_GO:
541                 /* cannot happen */
542                 WARN_ON(1);
543                 break;
544         }
545 
546         if (local->open_count == 0) {
547                 res = drv_start(local);
548                 if (res)
549                         goto err_del_bss;
550                 /* we're brought up, everything changes */
551                 hw_reconf_flags = ~0;
552                 ieee80211_led_radio(local, true);
553                 ieee80211_mod_tpt_led_trig(local,
554                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
555         }
556 
557         /*
558          * Copy the hopefully now-present MAC address to
559          * this interface, if it has the special null one.
560          */
561         if (dev && is_zero_ether_addr(dev->dev_addr)) {
562                 memcpy(dev->dev_addr,
563                        local->hw.wiphy->perm_addr,
564                        ETH_ALEN);
565                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
566 
567                 if (!is_valid_ether_addr(dev->dev_addr)) {
568                         res = -EADDRNOTAVAIL;
569                         goto err_stop;
570                 }
571         }
572 
573         switch (sdata->vif.type) {
574         case NL80211_IFTYPE_AP_VLAN:
575                 /* no need to tell driver, but set carrier and chanctx */
576                 if (rtnl_dereference(sdata->bss->beacon)) {
577                         ieee80211_vif_vlan_copy_chanctx(sdata);
578                         netif_carrier_on(dev);
579                 } else {
580                         netif_carrier_off(dev);
581                 }
582                 break;
583         case NL80211_IFTYPE_MONITOR:
584                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
585                         local->cooked_mntrs++;
586                         break;
587                 }
588 
589                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
590                         res = drv_add_interface(local, sdata);
591                         if (res)
592                                 goto err_stop;
593                 } else if (local->monitors == 0 && local->open_count == 0) {
594                         res = ieee80211_add_virtual_monitor(local);
595                         if (res)
596                                 goto err_stop;
597                 }
598 
599                 /* must be before the call to ieee80211_configure_filter */
600                 local->monitors++;
601                 if (local->monitors == 1) {
602                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
603                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
604                 }
605 
606                 ieee80211_adjust_monitor_flags(sdata, 1);
607                 ieee80211_configure_filter(local);
608                 mutex_lock(&local->mtx);
609                 ieee80211_recalc_idle(local);
610                 mutex_unlock(&local->mtx);
611 
612                 netif_carrier_on(dev);
613                 break;
614         default:
615                 if (coming_up) {
616                         ieee80211_del_virtual_monitor(local);
617 
618                         res = drv_add_interface(local, sdata);
619                         if (res)
620                                 goto err_stop;
621                         res = ieee80211_check_queues(sdata,
622                                 ieee80211_vif_type_p2p(&sdata->vif));
623                         if (res)
624                                 goto err_del_interface;
625                 }
626 
627                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
628                         local->fif_pspoll++;
629                         local->fif_probe_req++;
630 
631                         ieee80211_configure_filter(local);
632                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
633                         local->fif_probe_req++;
634                 }
635 
636                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
637                         changed |= ieee80211_reset_erp_info(sdata);
638                 ieee80211_bss_info_change_notify(sdata, changed);
639 
640                 switch (sdata->vif.type) {
641                 case NL80211_IFTYPE_STATION:
642                 case NL80211_IFTYPE_ADHOC:
643                 case NL80211_IFTYPE_AP:
644                 case NL80211_IFTYPE_MESH_POINT:
645                 case NL80211_IFTYPE_OCB:
646                         netif_carrier_off(dev);
647                         break;
648                 case NL80211_IFTYPE_WDS:
649                 case NL80211_IFTYPE_P2P_DEVICE:
650                         break;
651                 default:
652                         /* not reached */
653                         WARN_ON(1);
654                 }
655 
656                 /*
657                  * set default queue parameters so drivers don't
658                  * need to initialise the hardware if the hardware
659                  * doesn't start up with sane defaults
660                  */
661                 ieee80211_set_wmm_default(sdata, true);
662         }
663 
664         set_bit(SDATA_STATE_RUNNING, &sdata->state);
665 
666         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
667                 /* Create STA entry for the WDS peer */
668                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
669                                      GFP_KERNEL);
670                 if (!sta) {
671                         res = -ENOMEM;
672                         goto err_del_interface;
673                 }
674 
675                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
676                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
677                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
678 
679                 res = sta_info_insert(sta);
680                 if (res) {
681                         /* STA has been freed */
682                         goto err_del_interface;
683                 }
684 
685                 rate_control_rate_init(sta);
686                 netif_carrier_on(dev);
687         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
688                 rcu_assign_pointer(local->p2p_sdata, sdata);
689         }
690 
691         /*
692          * set_multicast_list will be invoked by the networking core
693          * which will check whether any increments here were done in
694          * error and sync them down to the hardware as filter flags.
695          */
696         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
697                 atomic_inc(&local->iff_allmultis);
698 
699         if (sdata->flags & IEEE80211_SDATA_PROMISC)
700                 atomic_inc(&local->iff_promiscs);
701 
702         if (coming_up)
703                 local->open_count++;
704 
705         if (hw_reconf_flags)
706                 ieee80211_hw_config(local, hw_reconf_flags);
707 
708         ieee80211_recalc_ps(local, -1);
709 
710         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
711             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
712                 /* XXX: for AP_VLAN, actually track AP queues */
713                 netif_tx_start_all_queues(dev);
714         } else if (dev) {
715                 unsigned long flags;
716                 int n_acs = IEEE80211_NUM_ACS;
717                 int ac;
718 
719                 if (local->hw.queues < IEEE80211_NUM_ACS)
720                         n_acs = 1;
721 
722                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
723                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
724                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
725                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
726                         for (ac = 0; ac < n_acs; ac++) {
727                                 int ac_queue = sdata->vif.hw_queue[ac];
728 
729                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
730                                     skb_queue_empty(&local->pending[ac_queue]))
731                                         netif_start_subqueue(dev, ac);
732                         }
733                 }
734                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
735         }
736 
737         return 0;
738  err_del_interface:
739         drv_remove_interface(local, sdata);
740  err_stop:
741         if (!local->open_count)
742                 drv_stop(local);
743  err_del_bss:
744         sdata->bss = NULL;
745         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
746                 mutex_lock(&local->mtx);
747                 list_del(&sdata->u.vlan.list);
748                 mutex_unlock(&local->mtx);
749         }
750         /* might already be clear but that doesn't matter */
751         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
752         return res;
753 }
754 
755 static int ieee80211_open(struct net_device *dev)
756 {
757         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
758         int err;
759 
760         /* fail early if user set an invalid address */
761         if (!is_valid_ether_addr(dev->dev_addr))
762                 return -EADDRNOTAVAIL;
763 
764         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
765         if (err)
766                 return err;
767 
768         return ieee80211_do_open(&sdata->wdev, true);
769 }
770 
771 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
772                               bool going_down)
773 {
774         struct ieee80211_local *local = sdata->local;
775         unsigned long flags;
776         struct sk_buff *skb, *tmp;
777         u32 hw_reconf_flags = 0;
778         int i, flushed;
779         struct ps_data *ps;
780         struct cfg80211_chan_def chandef;
781         bool cancel_scan;
782 
783         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
784 
785         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
786         if (cancel_scan)
787                 ieee80211_scan_cancel(local);
788 
789         /*
790          * Stop TX on this interface first.
791          */
792         if (sdata->dev)
793                 netif_tx_stop_all_queues(sdata->dev);
794 
795         ieee80211_roc_purge(local, sdata);
796 
797         switch (sdata->vif.type) {
798         case NL80211_IFTYPE_STATION:
799                 ieee80211_mgd_stop(sdata);
800                 break;
801         case NL80211_IFTYPE_ADHOC:
802                 ieee80211_ibss_stop(sdata);
803                 break;
804         case NL80211_IFTYPE_AP:
805                 cancel_work_sync(&sdata->u.ap.request_smps_work);
806                 break;
807         default:
808                 break;
809         }
810 
811         /*
812          * Remove all stations associated with this interface.
813          *
814          * This must be done before calling ops->remove_interface()
815          * because otherwise we can later invoke ops->sta_notify()
816          * whenever the STAs are removed, and that invalidates driver
817          * assumptions about always getting a vif pointer that is valid
818          * (because if we remove a STA after ops->remove_interface()
819          * the driver will have removed the vif info already!)
820          *
821          * This is relevant only in WDS mode, in all other modes we've
822          * already removed all stations when disconnecting or similar,
823          * so warn otherwise.
824          */
825         flushed = sta_info_flush(sdata);
826         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
827                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
828 
829         /* don't count this interface for promisc/allmulti while it is down */
830         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
831                 atomic_dec(&local->iff_allmultis);
832 
833         if (sdata->flags & IEEE80211_SDATA_PROMISC)
834                 atomic_dec(&local->iff_promiscs);
835 
836         if (sdata->vif.type == NL80211_IFTYPE_AP) {
837                 local->fif_pspoll--;
838                 local->fif_probe_req--;
839         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
840                 local->fif_probe_req--;
841         }
842 
843         if (sdata->dev) {
844                 netif_addr_lock_bh(sdata->dev);
845                 spin_lock_bh(&local->filter_lock);
846                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
847                                  sdata->dev->addr_len);
848                 spin_unlock_bh(&local->filter_lock);
849                 netif_addr_unlock_bh(sdata->dev);
850         }
851 
852         del_timer_sync(&local->dynamic_ps_timer);
853         cancel_work_sync(&local->dynamic_ps_enable_work);
854 
855         cancel_work_sync(&sdata->recalc_smps);
856         sdata_lock(sdata);
857         mutex_lock(&local->mtx);
858         sdata->vif.csa_active = false;
859         if (sdata->vif.type == NL80211_IFTYPE_STATION)
860                 sdata->u.mgd.csa_waiting_bcn = false;
861         if (sdata->csa_block_tx) {
862                 ieee80211_wake_vif_queues(local, sdata,
863                                           IEEE80211_QUEUE_STOP_REASON_CSA);
864                 sdata->csa_block_tx = false;
865         }
866         mutex_unlock(&local->mtx);
867         sdata_unlock(sdata);
868 
869         cancel_work_sync(&sdata->csa_finalize_work);
870 
871         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
872 
873         if (sdata->wdev.cac_started) {
874                 chandef = sdata->vif.bss_conf.chandef;
875                 WARN_ON(local->suspended);
876                 mutex_lock(&local->mtx);
877                 ieee80211_vif_release_channel(sdata);
878                 mutex_unlock(&local->mtx);
879                 cfg80211_cac_event(sdata->dev, &chandef,
880                                    NL80211_RADAR_CAC_ABORTED,
881                                    GFP_KERNEL);
882         }
883 
884         /* APs need special treatment */
885         if (sdata->vif.type == NL80211_IFTYPE_AP) {
886                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
887 
888                 /* down all dependent devices, that is VLANs */
889                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
890                                          u.vlan.list)
891                         dev_close(vlan->dev);
892                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
893         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
894                 /* remove all packets in parent bc_buf pointing to this dev */
895                 ps = &sdata->bss->ps;
896 
897                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
898                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
899                         if (skb->dev == sdata->dev) {
900                                 __skb_unlink(skb, &ps->bc_buf);
901                                 local->total_ps_buffered--;
902                                 ieee80211_free_txskb(&local->hw, skb);
903                         }
904                 }
905                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
906         }
907 
908         if (going_down)
909                 local->open_count--;
910 
911         switch (sdata->vif.type) {
912         case NL80211_IFTYPE_AP_VLAN:
913                 mutex_lock(&local->mtx);
914                 list_del(&sdata->u.vlan.list);
915                 mutex_unlock(&local->mtx);
916                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
917                 /* see comment in the default case below */
918                 ieee80211_free_keys(sdata, true);
919                 /* no need to tell driver */
920                 break;
921         case NL80211_IFTYPE_MONITOR:
922                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
923                         local->cooked_mntrs--;
924                         break;
925                 }
926 
927                 local->monitors--;
928                 if (local->monitors == 0) {
929                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
930                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
931                 }
932 
933                 ieee80211_adjust_monitor_flags(sdata, -1);
934                 break;
935         case NL80211_IFTYPE_P2P_DEVICE:
936                 /* relies on synchronize_rcu() below */
937                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
938                 /* fall through */
939         default:
940                 cancel_work_sync(&sdata->work);
941                 /*
942                  * When we get here, the interface is marked down.
943                  * Free the remaining keys, if there are any
944                  * (which can happen in AP mode if userspace sets
945                  * keys before the interface is operating, and maybe
946                  * also in WDS mode)
947                  *
948                  * Force the key freeing to always synchronize_net()
949                  * to wait for the RX path in case it is using this
950                  * interface enqueuing frames at this very time on
951                  * another CPU.
952                  */
953                 ieee80211_free_keys(sdata, true);
954                 skb_queue_purge(&sdata->skb_queue);
955         }
956 
957         sdata->bss = NULL;
958 
959         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
960         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
961                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
962                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
963                         if (info->control.vif == &sdata->vif) {
964                                 __skb_unlink(skb, &local->pending[i]);
965                                 ieee80211_free_txskb(&local->hw, skb);
966                         }
967                 }
968         }
969         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
970 
971         if (local->open_count == 0)
972                 ieee80211_clear_tx_pending(local);
973 
974         /*
975          * If the interface goes down while suspended, presumably because
976          * the device was unplugged and that happens before our resume,
977          * then the driver is already unconfigured and the remainder of
978          * this function isn't needed.
979          * XXX: what about WoWLAN? If the device has software state, e.g.
980          *      memory allocated, it might expect teardown commands from
981          *      mac80211 here?
982          */
983         if (local->suspended) {
984                 WARN_ON(local->wowlan);
985                 WARN_ON(rtnl_dereference(local->monitor_sdata));
986                 return;
987         }
988 
989         switch (sdata->vif.type) {
990         case NL80211_IFTYPE_AP_VLAN:
991                 break;
992         case NL80211_IFTYPE_MONITOR:
993                 if (local->monitors == 0)
994                         ieee80211_del_virtual_monitor(local);
995 
996                 mutex_lock(&local->mtx);
997                 ieee80211_recalc_idle(local);
998                 mutex_unlock(&local->mtx);
999 
1000                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1001                         break;
1002 
1003                 /* fall through */
1004         default:
1005                 if (going_down)
1006                         drv_remove_interface(local, sdata);
1007         }
1008 
1009         ieee80211_recalc_ps(local, -1);
1010 
1011         if (cancel_scan)
1012                 flush_delayed_work(&local->scan_work);
1013 
1014         if (local->open_count == 0) {
1015                 ieee80211_stop_device(local);
1016 
1017                 /* no reconfiguring after stop! */
1018                 return;
1019         }
1020 
1021         /* do after stop to avoid reconfiguring when we stop anyway */
1022         ieee80211_configure_filter(local);
1023         ieee80211_hw_config(local, hw_reconf_flags);
1024 
1025         if (local->monitors == local->open_count)
1026                 ieee80211_add_virtual_monitor(local);
1027 }
1028 
1029 static int ieee80211_stop(struct net_device *dev)
1030 {
1031         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1032 
1033         ieee80211_do_stop(sdata, true);
1034 
1035         return 0;
1036 }
1037 
1038 static void ieee80211_set_multicast_list(struct net_device *dev)
1039 {
1040         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1041         struct ieee80211_local *local = sdata->local;
1042         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1043 
1044         allmulti = !!(dev->flags & IFF_ALLMULTI);
1045         promisc = !!(dev->flags & IFF_PROMISC);
1046         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1047         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1048 
1049         if (allmulti != sdata_allmulti) {
1050                 if (dev->flags & IFF_ALLMULTI)
1051                         atomic_inc(&local->iff_allmultis);
1052                 else
1053                         atomic_dec(&local->iff_allmultis);
1054                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1055         }
1056 
1057         if (promisc != sdata_promisc) {
1058                 if (dev->flags & IFF_PROMISC)
1059                         atomic_inc(&local->iff_promiscs);
1060                 else
1061                         atomic_dec(&local->iff_promiscs);
1062                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1063         }
1064         spin_lock_bh(&local->filter_lock);
1065         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1066         spin_unlock_bh(&local->filter_lock);
1067         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1068 }
1069 
1070 /*
1071  * Called when the netdev is removed or, by the code below, before
1072  * the interface type changes.
1073  */
1074 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1075 {
1076         int i;
1077 
1078         /* free extra data */
1079         ieee80211_free_keys(sdata, false);
1080 
1081         ieee80211_debugfs_remove_netdev(sdata);
1082 
1083         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1084                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1085         sdata->fragment_next = 0;
1086 
1087         if (ieee80211_vif_is_mesh(&sdata->vif))
1088                 mesh_rmc_free(sdata);
1089 }
1090 
1091 static void ieee80211_uninit(struct net_device *dev)
1092 {
1093         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1094 }
1095 
1096 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1097                                          struct sk_buff *skb,
1098                                          void *accel_priv,
1099                                          select_queue_fallback_t fallback)
1100 {
1101         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1102 }
1103 
1104 static const struct net_device_ops ieee80211_dataif_ops = {
1105         .ndo_open               = ieee80211_open,
1106         .ndo_stop               = ieee80211_stop,
1107         .ndo_uninit             = ieee80211_uninit,
1108         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1109         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1110         .ndo_change_mtu         = ieee80211_change_mtu,
1111         .ndo_set_mac_address    = ieee80211_change_mac,
1112         .ndo_select_queue       = ieee80211_netdev_select_queue,
1113 };
1114 
1115 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1116                                           struct sk_buff *skb,
1117                                           void *accel_priv,
1118                                           select_queue_fallback_t fallback)
1119 {
1120         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1121         struct ieee80211_local *local = sdata->local;
1122         struct ieee80211_hdr *hdr;
1123         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1124 
1125         if (local->hw.queues < IEEE80211_NUM_ACS)
1126                 return 0;
1127 
1128         if (skb->len < 4 ||
1129             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1130                 return 0; /* doesn't matter, frame will be dropped */
1131 
1132         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1133 
1134         return ieee80211_select_queue_80211(sdata, skb, hdr);
1135 }
1136 
1137 static const struct net_device_ops ieee80211_monitorif_ops = {
1138         .ndo_open               = ieee80211_open,
1139         .ndo_stop               = ieee80211_stop,
1140         .ndo_uninit             = ieee80211_uninit,
1141         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1142         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1143         .ndo_change_mtu         = ieee80211_change_mtu,
1144         .ndo_set_mac_address    = ieee80211_change_mac,
1145         .ndo_select_queue       = ieee80211_monitor_select_queue,
1146 };
1147 
1148 static void ieee80211_if_setup(struct net_device *dev)
1149 {
1150         ether_setup(dev);
1151         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1152         dev->netdev_ops = &ieee80211_dataif_ops;
1153         dev->destructor = free_netdev;
1154 }
1155 
1156 static void ieee80211_iface_work(struct work_struct *work)
1157 {
1158         struct ieee80211_sub_if_data *sdata =
1159                 container_of(work, struct ieee80211_sub_if_data, work);
1160         struct ieee80211_local *local = sdata->local;
1161         struct sk_buff *skb;
1162         struct sta_info *sta;
1163         struct ieee80211_ra_tid *ra_tid;
1164         struct ieee80211_rx_agg *rx_agg;
1165 
1166         if (!ieee80211_sdata_running(sdata))
1167                 return;
1168 
1169         if (local->scanning)
1170                 return;
1171 
1172         /*
1173          * ieee80211_queue_work() should have picked up most cases,
1174          * here we'll pick the rest.
1175          */
1176         if (WARN(local->suspended,
1177                  "interface work scheduled while going to suspend\n"))
1178                 return;
1179 
1180         /* first process frames */
1181         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1182                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1183 
1184                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1185                         ra_tid = (void *)&skb->cb;
1186                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1187                                                  ra_tid->tid);
1188                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1189                         ra_tid = (void *)&skb->cb;
1190                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1191                                                 ra_tid->tid);
1192                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1193                         rx_agg = (void *)&skb->cb;
1194                         mutex_lock(&local->sta_mtx);
1195                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1196                         if (sta)
1197                                 __ieee80211_start_rx_ba_session(sta,
1198                                                 0, 0, 0, 1, rx_agg->tid,
1199                                                 IEEE80211_MAX_AMPDU_BUF,
1200                                                 false, true);
1201                         mutex_unlock(&local->sta_mtx);
1202                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1203                         rx_agg = (void *)&skb->cb;
1204                         mutex_lock(&local->sta_mtx);
1205                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1206                         if (sta)
1207                                 __ieee80211_stop_rx_ba_session(sta,
1208                                                         rx_agg->tid,
1209                                                         WLAN_BACK_RECIPIENT, 0,
1210                                                         false);
1211                         mutex_unlock(&local->sta_mtx);
1212                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1213                         ieee80211_process_tdls_channel_switch(sdata, skb);
1214                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1215                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1216                         int len = skb->len;
1217 
1218                         mutex_lock(&local->sta_mtx);
1219                         sta = sta_info_get_bss(sdata, mgmt->sa);
1220                         if (sta) {
1221                                 switch (mgmt->u.action.u.addba_req.action_code) {
1222                                 case WLAN_ACTION_ADDBA_REQ:
1223                                         ieee80211_process_addba_request(
1224                                                         local, sta, mgmt, len);
1225                                         break;
1226                                 case WLAN_ACTION_ADDBA_RESP:
1227                                         ieee80211_process_addba_resp(local, sta,
1228                                                                      mgmt, len);
1229                                         break;
1230                                 case WLAN_ACTION_DELBA:
1231                                         ieee80211_process_delba(sdata, sta,
1232                                                                 mgmt, len);
1233                                         break;
1234                                 default:
1235                                         WARN_ON(1);
1236                                         break;
1237                                 }
1238                         }
1239                         mutex_unlock(&local->sta_mtx);
1240                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1241                         struct ieee80211_hdr *hdr = (void *)mgmt;
1242                         /*
1243                          * So the frame isn't mgmt, but frame_control
1244                          * is at the right place anyway, of course, so
1245                          * the if statement is correct.
1246                          *
1247                          * Warn if we have other data frame types here,
1248                          * they must not get here.
1249                          */
1250                         WARN_ON(hdr->frame_control &
1251                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1252                         WARN_ON(!(hdr->seq_ctrl &
1253                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1254                         /*
1255                          * This was a fragment of a frame, received while
1256                          * a block-ack session was active. That cannot be
1257                          * right, so terminate the session.
1258                          */
1259                         mutex_lock(&local->sta_mtx);
1260                         sta = sta_info_get_bss(sdata, mgmt->sa);
1261                         if (sta) {
1262                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1263                                                 IEEE80211_QOS_CTL_TID_MASK;
1264 
1265                                 __ieee80211_stop_rx_ba_session(
1266                                         sta, tid, WLAN_BACK_RECIPIENT,
1267                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1268                                         true);
1269                         }
1270                         mutex_unlock(&local->sta_mtx);
1271                 } else switch (sdata->vif.type) {
1272                 case NL80211_IFTYPE_STATION:
1273                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1274                         break;
1275                 case NL80211_IFTYPE_ADHOC:
1276                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1277                         break;
1278                 case NL80211_IFTYPE_MESH_POINT:
1279                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1280                                 break;
1281                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1282                         break;
1283                 default:
1284                         WARN(1, "frame for unexpected interface type");
1285                         break;
1286                 }
1287 
1288                 kfree_skb(skb);
1289         }
1290 
1291         /* then other type-dependent work */
1292         switch (sdata->vif.type) {
1293         case NL80211_IFTYPE_STATION:
1294                 ieee80211_sta_work(sdata);
1295                 break;
1296         case NL80211_IFTYPE_ADHOC:
1297                 ieee80211_ibss_work(sdata);
1298                 break;
1299         case NL80211_IFTYPE_MESH_POINT:
1300                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1301                         break;
1302                 ieee80211_mesh_work(sdata);
1303                 break;
1304         case NL80211_IFTYPE_OCB:
1305                 ieee80211_ocb_work(sdata);
1306                 break;
1307         default:
1308                 break;
1309         }
1310 }
1311 
1312 static void ieee80211_recalc_smps_work(struct work_struct *work)
1313 {
1314         struct ieee80211_sub_if_data *sdata =
1315                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1316 
1317         ieee80211_recalc_smps(sdata);
1318 }
1319 
1320 /*
1321  * Helper function to initialise an interface to a specific type.
1322  */
1323 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1324                                   enum nl80211_iftype type)
1325 {
1326         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1327                                                     0xff, 0xff, 0xff};
1328 
1329         /* clear type-dependent union */
1330         memset(&sdata->u, 0, sizeof(sdata->u));
1331 
1332         /* and set some type-dependent values */
1333         sdata->vif.type = type;
1334         sdata->vif.p2p = false;
1335         sdata->wdev.iftype = type;
1336 
1337         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1338         sdata->control_port_no_encrypt = false;
1339         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1340         sdata->vif.bss_conf.idle = true;
1341 
1342         sdata->noack_map = 0;
1343 
1344         /* only monitor/p2p-device differ */
1345         if (sdata->dev) {
1346                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1347                 sdata->dev->type = ARPHRD_ETHER;
1348         }
1349 
1350         skb_queue_head_init(&sdata->skb_queue);
1351         INIT_WORK(&sdata->work, ieee80211_iface_work);
1352         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1353         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1354         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1355         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1356 
1357         switch (type) {
1358         case NL80211_IFTYPE_P2P_GO:
1359                 type = NL80211_IFTYPE_AP;
1360                 sdata->vif.type = type;
1361                 sdata->vif.p2p = true;
1362                 /* fall through */
1363         case NL80211_IFTYPE_AP:
1364                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1365                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1366                 INIT_WORK(&sdata->u.ap.request_smps_work,
1367                           ieee80211_request_smps_ap_work);
1368                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1369                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1370                 break;
1371         case NL80211_IFTYPE_P2P_CLIENT:
1372                 type = NL80211_IFTYPE_STATION;
1373                 sdata->vif.type = type;
1374                 sdata->vif.p2p = true;
1375                 /* fall through */
1376         case NL80211_IFTYPE_STATION:
1377                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1378                 ieee80211_sta_setup_sdata(sdata);
1379                 break;
1380         case NL80211_IFTYPE_OCB:
1381                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1382                 ieee80211_ocb_setup_sdata(sdata);
1383                 break;
1384         case NL80211_IFTYPE_ADHOC:
1385                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1386                 ieee80211_ibss_setup_sdata(sdata);
1387                 break;
1388         case NL80211_IFTYPE_MESH_POINT:
1389                 if (ieee80211_vif_is_mesh(&sdata->vif))
1390                         ieee80211_mesh_init_sdata(sdata);
1391                 break;
1392         case NL80211_IFTYPE_MONITOR:
1393                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1394                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1395                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1396                                       MONITOR_FLAG_OTHER_BSS;
1397                 break;
1398         case NL80211_IFTYPE_WDS:
1399                 sdata->vif.bss_conf.bssid = NULL;
1400                 break;
1401         case NL80211_IFTYPE_AP_VLAN:
1402         case NL80211_IFTYPE_P2P_DEVICE:
1403                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1404                 break;
1405         case NL80211_IFTYPE_UNSPECIFIED:
1406         case NUM_NL80211_IFTYPES:
1407                 BUG();
1408                 break;
1409         }
1410 
1411         ieee80211_debugfs_add_netdev(sdata);
1412 }
1413 
1414 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1415                                            enum nl80211_iftype type)
1416 {
1417         struct ieee80211_local *local = sdata->local;
1418         int ret, err;
1419         enum nl80211_iftype internal_type = type;
1420         bool p2p = false;
1421 
1422         ASSERT_RTNL();
1423 
1424         if (!local->ops->change_interface)
1425                 return -EBUSY;
1426 
1427         switch (sdata->vif.type) {
1428         case NL80211_IFTYPE_AP:
1429         case NL80211_IFTYPE_STATION:
1430         case NL80211_IFTYPE_ADHOC:
1431         case NL80211_IFTYPE_OCB:
1432                 /*
1433                  * Could maybe also all others here?
1434                  * Just not sure how that interacts
1435                  * with the RX/config path e.g. for
1436                  * mesh.
1437                  */
1438                 break;
1439         default:
1440                 return -EBUSY;
1441         }
1442 
1443         switch (type) {
1444         case NL80211_IFTYPE_AP:
1445         case NL80211_IFTYPE_STATION:
1446         case NL80211_IFTYPE_ADHOC:
1447         case NL80211_IFTYPE_OCB:
1448                 /*
1449                  * Could probably support everything
1450                  * but WDS here (WDS do_open can fail
1451                  * under memory pressure, which this
1452                  * code isn't prepared to handle).
1453                  */
1454                 break;
1455         case NL80211_IFTYPE_P2P_CLIENT:
1456                 p2p = true;
1457                 internal_type = NL80211_IFTYPE_STATION;
1458                 break;
1459         case NL80211_IFTYPE_P2P_GO:
1460                 p2p = true;
1461                 internal_type = NL80211_IFTYPE_AP;
1462                 break;
1463         default:
1464                 return -EBUSY;
1465         }
1466 
1467         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1468         if (ret)
1469                 return ret;
1470 
1471         ieee80211_do_stop(sdata, false);
1472 
1473         ieee80211_teardown_sdata(sdata);
1474 
1475         ret = drv_change_interface(local, sdata, internal_type, p2p);
1476         if (ret)
1477                 type = ieee80211_vif_type_p2p(&sdata->vif);
1478 
1479         /*
1480          * Ignore return value here, there's not much we can do since
1481          * the driver changed the interface type internally already.
1482          * The warnings will hopefully make driver authors fix it :-)
1483          */
1484         ieee80211_check_queues(sdata, type);
1485 
1486         ieee80211_setup_sdata(sdata, type);
1487 
1488         err = ieee80211_do_open(&sdata->wdev, false);
1489         WARN(err, "type change: do_open returned %d", err);
1490 
1491         return ret;
1492 }
1493 
1494 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1495                              enum nl80211_iftype type)
1496 {
1497         int ret;
1498 
1499         ASSERT_RTNL();
1500 
1501         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1502                 return 0;
1503 
1504         if (ieee80211_sdata_running(sdata)) {
1505                 ret = ieee80211_runtime_change_iftype(sdata, type);
1506                 if (ret)
1507                         return ret;
1508         } else {
1509                 /* Purge and reset type-dependent state. */
1510                 ieee80211_teardown_sdata(sdata);
1511                 ieee80211_setup_sdata(sdata, type);
1512         }
1513 
1514         /* reset some values that shouldn't be kept across type changes */
1515         sdata->drop_unencrypted = 0;
1516         if (type == NL80211_IFTYPE_STATION)
1517                 sdata->u.mgd.use_4addr = false;
1518 
1519         return 0;
1520 }
1521 
1522 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1523                                        u8 *perm_addr, enum nl80211_iftype type)
1524 {
1525         struct ieee80211_sub_if_data *sdata;
1526         u64 mask, start, addr, val, inc;
1527         u8 *m;
1528         u8 tmp_addr[ETH_ALEN];
1529         int i;
1530 
1531         /* default ... something at least */
1532         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1533 
1534         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1535             local->hw.wiphy->n_addresses <= 1)
1536                 return;
1537 
1538         mutex_lock(&local->iflist_mtx);
1539 
1540         switch (type) {
1541         case NL80211_IFTYPE_MONITOR:
1542                 /* doesn't matter */
1543                 break;
1544         case NL80211_IFTYPE_WDS:
1545         case NL80211_IFTYPE_AP_VLAN:
1546                 /* match up with an AP interface */
1547                 list_for_each_entry(sdata, &local->interfaces, list) {
1548                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1549                                 continue;
1550                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1551                         break;
1552                 }
1553                 /* keep default if no AP interface present */
1554                 break;
1555         case NL80211_IFTYPE_P2P_CLIENT:
1556         case NL80211_IFTYPE_P2P_GO:
1557                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1558                         list_for_each_entry(sdata, &local->interfaces, list) {
1559                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1560                                         continue;
1561                                 if (!ieee80211_sdata_running(sdata))
1562                                         continue;
1563                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1564                                 goto out_unlock;
1565                         }
1566                 }
1567                 /* otherwise fall through */
1568         default:
1569                 /* assign a new address if possible -- try n_addresses first */
1570                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1571                         bool used = false;
1572 
1573                         list_for_each_entry(sdata, &local->interfaces, list) {
1574                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1575                                                      sdata->vif.addr)) {
1576                                         used = true;
1577                                         break;
1578                                 }
1579                         }
1580 
1581                         if (!used) {
1582                                 memcpy(perm_addr,
1583                                        local->hw.wiphy->addresses[i].addr,
1584                                        ETH_ALEN);
1585                                 break;
1586                         }
1587                 }
1588 
1589                 /* try mask if available */
1590                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1591                         break;
1592 
1593                 m = local->hw.wiphy->addr_mask;
1594                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1595                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1596                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1597 
1598                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1599                         /* not a contiguous mask ... not handled now! */
1600                         pr_info("not contiguous\n");
1601                         break;
1602                 }
1603 
1604                 /*
1605                  * Pick address of existing interface in case user changed
1606                  * MAC address manually, default to perm_addr.
1607                  */
1608                 m = local->hw.wiphy->perm_addr;
1609                 list_for_each_entry(sdata, &local->interfaces, list) {
1610                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1611                                 continue;
1612                         m = sdata->vif.addr;
1613                         break;
1614                 }
1615                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1616                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1617                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1618 
1619                 inc = 1ULL<<__ffs64(mask);
1620                 val = (start & mask);
1621                 addr = (start & ~mask) | (val & mask);
1622                 do {
1623                         bool used = false;
1624 
1625                         tmp_addr[5] = addr >> 0*8;
1626                         tmp_addr[4] = addr >> 1*8;
1627                         tmp_addr[3] = addr >> 2*8;
1628                         tmp_addr[2] = addr >> 3*8;
1629                         tmp_addr[1] = addr >> 4*8;
1630                         tmp_addr[0] = addr >> 5*8;
1631 
1632                         val += inc;
1633 
1634                         list_for_each_entry(sdata, &local->interfaces, list) {
1635                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1636                                         used = true;
1637                                         break;
1638                                 }
1639                         }
1640 
1641                         if (!used) {
1642                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1643                                 break;
1644                         }
1645                         addr = (start & ~mask) | (val & mask);
1646                 } while (addr != start);
1647 
1648                 break;
1649         }
1650 
1651  out_unlock:
1652         mutex_unlock(&local->iflist_mtx);
1653 }
1654 
1655 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1656                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1657                      struct vif_params *params)
1658 {
1659         struct net_device *ndev = NULL;
1660         struct ieee80211_sub_if_data *sdata = NULL;
1661         int ret, i;
1662         int txqs = 1;
1663 
1664         ASSERT_RTNL();
1665 
1666         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1667                 struct wireless_dev *wdev;
1668 
1669                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1670                                 GFP_KERNEL);
1671                 if (!sdata)
1672                         return -ENOMEM;
1673                 wdev = &sdata->wdev;
1674 
1675                 sdata->dev = NULL;
1676                 strlcpy(sdata->name, name, IFNAMSIZ);
1677                 ieee80211_assign_perm_addr(local, wdev->address, type);
1678                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1679         } else {
1680                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1681                         txqs = IEEE80211_NUM_ACS;
1682 
1683                 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1684                                         name, NET_NAME_UNKNOWN,
1685                                         ieee80211_if_setup, txqs, 1);
1686                 if (!ndev)
1687                         return -ENOMEM;
1688                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1689 
1690                 ndev->needed_headroom = local->tx_headroom +
1691                                         4*6 /* four MAC addresses */
1692                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1693                                         + 6 /* mesh */
1694                                         + 8 /* rfc1042/bridge tunnel */
1695                                         - ETH_HLEN /* ethernet hard_header_len */
1696                                         + IEEE80211_ENCRYPT_HEADROOM;
1697                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1698 
1699                 ret = dev_alloc_name(ndev, ndev->name);
1700                 if (ret < 0) {
1701                         free_netdev(ndev);
1702                         return ret;
1703                 }
1704 
1705                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1706                 if (params && is_valid_ether_addr(params->macaddr))
1707                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1708                 else
1709                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1710                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1711 
1712                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1713                 sdata = netdev_priv(ndev);
1714                 ndev->ieee80211_ptr = &sdata->wdev;
1715                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1716                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1717 
1718                 sdata->dev = ndev;
1719         }
1720 
1721         /* initialise type-independent data */
1722         sdata->wdev.wiphy = local->hw.wiphy;
1723         sdata->local = local;
1724 
1725         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1726                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1727 
1728         INIT_LIST_HEAD(&sdata->key_list);
1729 
1730         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1731                           ieee80211_dfs_cac_timer_work);
1732         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1733                           ieee80211_delayed_tailroom_dec);
1734 
1735         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1736                 struct ieee80211_supported_band *sband;
1737                 sband = local->hw.wiphy->bands[i];
1738                 sdata->rc_rateidx_mask[i] =
1739                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1740                 if (sband)
1741                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1742                                sband->ht_cap.mcs.rx_mask,
1743                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1744                 else
1745                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1746                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1747         }
1748 
1749         ieee80211_set_default_queues(sdata);
1750 
1751         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1752         sdata->user_power_level = local->user_power_level;
1753 
1754         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1755 
1756         /* setup type-dependent data */
1757         ieee80211_setup_sdata(sdata, type);
1758 
1759         if (ndev) {
1760                 if (params) {
1761                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1762                         if (type == NL80211_IFTYPE_STATION)
1763                                 sdata->u.mgd.use_4addr = params->use_4addr;
1764                 }
1765 
1766                 ndev->features |= local->hw.netdev_features;
1767 
1768                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1769 
1770                 ret = register_netdevice(ndev);
1771                 if (ret) {
1772                         free_netdev(ndev);
1773                         return ret;
1774                 }
1775         }
1776 
1777         mutex_lock(&local->iflist_mtx);
1778         list_add_tail_rcu(&sdata->list, &local->interfaces);
1779         mutex_unlock(&local->iflist_mtx);
1780 
1781         if (new_wdev)
1782                 *new_wdev = &sdata->wdev;
1783 
1784         return 0;
1785 }
1786 
1787 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1788 {
1789         ASSERT_RTNL();
1790 
1791         mutex_lock(&sdata->local->iflist_mtx);
1792         list_del_rcu(&sdata->list);
1793         mutex_unlock(&sdata->local->iflist_mtx);
1794 
1795         synchronize_rcu();
1796 
1797         if (sdata->dev) {
1798                 unregister_netdevice(sdata->dev);
1799         } else {
1800                 cfg80211_unregister_wdev(&sdata->wdev);
1801                 kfree(sdata);
1802         }
1803 }
1804 
1805 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1806 {
1807         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1808                 return;
1809         ieee80211_do_stop(sdata, true);
1810         ieee80211_teardown_sdata(sdata);
1811 }
1812 
1813 /*
1814  * Remove all interfaces, may only be called at hardware unregistration
1815  * time because it doesn't do RCU-safe list removals.
1816  */
1817 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1818 {
1819         struct ieee80211_sub_if_data *sdata, *tmp;
1820         LIST_HEAD(unreg_list);
1821         LIST_HEAD(wdev_list);
1822 
1823         ASSERT_RTNL();
1824 
1825         /*
1826          * Close all AP_VLAN interfaces first, as otherwise they
1827          * might be closed while the AP interface they belong to
1828          * is closed, causing unregister_netdevice_many() to crash.
1829          */
1830         list_for_each_entry(sdata, &local->interfaces, list)
1831                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1832                         dev_close(sdata->dev);
1833 
1834         mutex_lock(&local->iflist_mtx);
1835         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1836                 list_del(&sdata->list);
1837 
1838                 if (sdata->dev)
1839                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1840                 else
1841                         list_add(&sdata->list, &wdev_list);
1842         }
1843         mutex_unlock(&local->iflist_mtx);
1844         unregister_netdevice_many(&unreg_list);
1845 
1846         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1847                 list_del(&sdata->list);
1848                 cfg80211_unregister_wdev(&sdata->wdev);
1849                 kfree(sdata);
1850         }
1851 }
1852 
1853 static int netdev_notify(struct notifier_block *nb,
1854                          unsigned long state, void *ptr)
1855 {
1856         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1857         struct ieee80211_sub_if_data *sdata;
1858 
1859         if (state != NETDEV_CHANGENAME)
1860                 return NOTIFY_DONE;
1861 
1862         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1863                 return NOTIFY_DONE;
1864 
1865         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1866                 return NOTIFY_DONE;
1867 
1868         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1869         memcpy(sdata->name, dev->name, IFNAMSIZ);
1870         ieee80211_debugfs_rename_netdev(sdata);
1871 
1872         return NOTIFY_OK;
1873 }
1874 
1875 static struct notifier_block mac80211_netdev_notifier = {
1876         .notifier_call = netdev_notify,
1877 };
1878 
1879 int ieee80211_iface_init(void)
1880 {
1881         return register_netdevice_notifier(&mac80211_netdev_notifier);
1882 }
1883 
1884 void ieee80211_iface_exit(void)
1885 {
1886         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1887 }
1888 

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