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TOMOYO Linux Cross Reference
Linux/net/mac80211/iface.c

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  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  * Copyright (c) 2016        Intel Deutschland GmbH
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License version 2 as
 13  * published by the Free Software Foundation.
 14  */
 15 #include <linux/slab.h>
 16 #include <linux/kernel.h>
 17 #include <linux/if_arp.h>
 18 #include <linux/netdevice.h>
 19 #include <linux/rtnetlink.h>
 20 #include <net/mac80211.h>
 21 #include <net/ieee80211_radiotap.h>
 22 #include "ieee80211_i.h"
 23 #include "sta_info.h"
 24 #include "debugfs_netdev.h"
 25 #include "mesh.h"
 26 #include "led.h"
 27 #include "driver-ops.h"
 28 #include "wme.h"
 29 #include "rate.h"
 30 
 31 /**
 32  * DOC: Interface list locking
 33  *
 34  * The interface list in each struct ieee80211_local is protected
 35  * three-fold:
 36  *
 37  * (1) modifications may only be done under the RTNL
 38  * (2) modifications and readers are protected against each other by
 39  *     the iflist_mtx.
 40  * (3) modifications are done in an RCU manner so atomic readers
 41  *     can traverse the list in RCU-safe blocks.
 42  *
 43  * As a consequence, reads (traversals) of the list can be protected
 44  * by either the RTNL, the iflist_mtx or RCU.
 45  */
 46 
 47 static void ieee80211_iface_work(struct work_struct *work);
 48 
 49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 50 {
 51         struct ieee80211_chanctx_conf *chanctx_conf;
 52         int power;
 53 
 54         rcu_read_lock();
 55         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 56         if (!chanctx_conf) {
 57                 rcu_read_unlock();
 58                 return false;
 59         }
 60 
 61         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 62         rcu_read_unlock();
 63 
 64         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 65                 power = min(power, sdata->user_power_level);
 66 
 67         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 68                 power = min(power, sdata->ap_power_level);
 69 
 70         if (power != sdata->vif.bss_conf.txpower) {
 71                 sdata->vif.bss_conf.txpower = power;
 72                 ieee80211_hw_config(sdata->local, 0);
 73                 return true;
 74         }
 75 
 76         return false;
 77 }
 78 
 79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 80                               bool update_bss)
 81 {
 82         if (__ieee80211_recalc_txpower(sdata) ||
 83             (update_bss && ieee80211_sdata_running(sdata)))
 84                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 85 }
 86 
 87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 88 {
 89         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 90                 return 0;
 91 
 92         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 93         return IEEE80211_CONF_CHANGE_IDLE;
 94 }
 95 
 96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 97 {
 98         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 99                 return 0;
100 
101         ieee80211_flush_queues(local, NULL, false);
102 
103         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104         return IEEE80211_CONF_CHANGE_IDLE;
105 }
106 
107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108                                    bool force_active)
109 {
110         bool working, scanning, active;
111         unsigned int led_trig_start = 0, led_trig_stop = 0;
112 
113         lockdep_assert_held(&local->mtx);
114 
115         active = force_active ||
116                  !list_empty(&local->chanctx_list) ||
117                  local->monitors;
118 
119         working = !local->ops->remain_on_channel &&
120                   !list_empty(&local->roc_list);
121 
122         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124 
125         if (working || scanning)
126                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127         else
128                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129 
130         if (active)
131                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132         else
133                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134 
135         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136 
137         if (working || scanning || active)
138                 return __ieee80211_idle_off(local);
139         return __ieee80211_idle_on(local);
140 }
141 
142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144         return __ieee80211_recalc_idle(local, true);
145 }
146 
147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149         u32 change = __ieee80211_recalc_idle(local, false);
150         if (change)
151                 ieee80211_hw_config(local, change);
152 }
153 
154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155                                 bool check_dup)
156 {
157         struct ieee80211_local *local = sdata->local;
158         struct ieee80211_sub_if_data *iter;
159         u64 new, mask, tmp;
160         u8 *m;
161         int ret = 0;
162 
163         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164                 return 0;
165 
166         m = addr;
167         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170 
171         m = local->hw.wiphy->addr_mask;
172         mask =  ((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         if (!check_dup)
177                 return ret;
178 
179         mutex_lock(&local->iflist_mtx);
180         list_for_each_entry(iter, &local->interfaces, list) {
181                 if (iter == sdata)
182                         continue;
183 
184                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186                         continue;
187 
188                 m = iter->vif.addr;
189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192 
193                 if ((new & ~mask) != (tmp & ~mask)) {
194                         ret = -EINVAL;
195                         break;
196                 }
197         }
198         mutex_unlock(&local->iflist_mtx);
199 
200         return ret;
201 }
202 
203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
204 {
205         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
206         struct sockaddr *sa = addr;
207         bool check_dup = true;
208         int ret;
209 
210         if (ieee80211_sdata_running(sdata))
211                 return -EBUSY;
212 
213         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
214             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
215                 check_dup = false;
216 
217         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
218         if (ret)
219                 return ret;
220 
221         ret = eth_mac_addr(dev, sa);
222 
223         if (ret == 0)
224                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
225 
226         return ret;
227 }
228 
229 static inline int identical_mac_addr_allowed(int type1, int type2)
230 {
231         return type1 == NL80211_IFTYPE_MONITOR ||
232                 type2 == NL80211_IFTYPE_MONITOR ||
233                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
234                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
235                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
236                 (type1 == NL80211_IFTYPE_WDS &&
237                         (type2 == NL80211_IFTYPE_WDS ||
238                          type2 == NL80211_IFTYPE_AP)) ||
239                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
240                 (type1 == NL80211_IFTYPE_AP_VLAN &&
241                         (type2 == NL80211_IFTYPE_AP ||
242                          type2 == NL80211_IFTYPE_AP_VLAN));
243 }
244 
245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
246                                             enum nl80211_iftype iftype)
247 {
248         struct ieee80211_local *local = sdata->local;
249         struct ieee80211_sub_if_data *nsdata;
250         int ret;
251 
252         ASSERT_RTNL();
253 
254         /* we hold the RTNL here so can safely walk the list */
255         list_for_each_entry(nsdata, &local->interfaces, list) {
256                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
257                         /*
258                          * Only OCB and monitor mode may coexist
259                          */
260                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
261                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
262                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
263                              nsdata->vif.type == NL80211_IFTYPE_OCB))
264                                 return -EBUSY;
265 
266                         /*
267                          * Allow only a single IBSS interface to be up at any
268                          * time. This is restricted because beacon distribution
269                          * cannot work properly if both are in the same IBSS.
270                          *
271                          * To remove this restriction we'd have to disallow them
272                          * from setting the same SSID on different IBSS interfaces
273                          * belonging to the same hardware. Then, however, we're
274                          * faced with having to adopt two different TSF timers...
275                          */
276                         if (iftype == NL80211_IFTYPE_ADHOC &&
277                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
278                                 return -EBUSY;
279                         /*
280                          * will not add another interface while any channel
281                          * switch is active.
282                          */
283                         if (nsdata->vif.csa_active)
284                                 return -EBUSY;
285 
286                         /*
287                          * The remaining checks are only performed for interfaces
288                          * with the same MAC address.
289                          */
290                         if (!ether_addr_equal(sdata->vif.addr,
291                                               nsdata->vif.addr))
292                                 continue;
293 
294                         /*
295                          * check whether it may have the same address
296                          */
297                         if (!identical_mac_addr_allowed(iftype,
298                                                         nsdata->vif.type))
299                                 return -ENOTUNIQ;
300 
301                         /*
302                          * can only add VLANs to enabled APs
303                          */
304                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
305                             nsdata->vif.type == NL80211_IFTYPE_AP)
306                                 sdata->bss = &nsdata->u.ap;
307                 }
308         }
309 
310         mutex_lock(&local->chanctx_mtx);
311         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
312         mutex_unlock(&local->chanctx_mtx);
313         return ret;
314 }
315 
316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
317                                   enum nl80211_iftype iftype)
318 {
319         int n_queues = sdata->local->hw.queues;
320         int i;
321 
322         if (iftype == NL80211_IFTYPE_NAN)
323                 return 0;
324 
325         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
326                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
327                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
328                                          IEEE80211_INVAL_HW_QUEUE))
329                                 return -EINVAL;
330                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
331                                          n_queues))
332                                 return -EINVAL;
333                 }
334         }
335 
336         if ((iftype != NL80211_IFTYPE_AP &&
337              iftype != NL80211_IFTYPE_P2P_GO &&
338              iftype != NL80211_IFTYPE_MESH_POINT) ||
339             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
340                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341                 return 0;
342         }
343 
344         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
345                 return -EINVAL;
346 
347         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
348                 return -EINVAL;
349 
350         return 0;
351 }
352 
353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
354                                     const int offset)
355 {
356         struct ieee80211_local *local = sdata->local;
357         u32 flags = sdata->u.mntr.flags;
358 
359 #define ADJUST(_f, _s)  do {                                    \
360         if (flags & MONITOR_FLAG_##_f)                          \
361                 local->fif_##_s += offset;                      \
362         } while (0)
363 
364         ADJUST(FCSFAIL, fcsfail);
365         ADJUST(PLCPFAIL, plcpfail);
366         ADJUST(CONTROL, control);
367         ADJUST(CONTROL, pspoll);
368         ADJUST(OTHER_BSS, other_bss);
369 
370 #undef ADJUST
371 }
372 
373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
374 {
375         struct ieee80211_local *local = sdata->local;
376         int i;
377 
378         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
379                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
380                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
381                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
382                         sdata->vif.hw_queue[i] = i;
383                 else
384                         sdata->vif.hw_queue[i] = 0;
385         }
386         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
387 }
388 
389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
390 {
391         struct ieee80211_sub_if_data *sdata;
392         int ret;
393 
394         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
395                 return 0;
396 
397         ASSERT_RTNL();
398 
399         if (local->monitor_sdata)
400                 return 0;
401 
402         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
403         if (!sdata)
404                 return -ENOMEM;
405 
406         /* set up data */
407         sdata->local = local;
408         sdata->vif.type = NL80211_IFTYPE_MONITOR;
409         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
410                  wiphy_name(local->hw.wiphy));
411         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
412 
413         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
414 
415         ieee80211_set_default_queues(sdata);
416 
417         ret = drv_add_interface(local, sdata);
418         if (WARN_ON(ret)) {
419                 /* ok .. stupid driver, it asked for this! */
420                 kfree(sdata);
421                 return ret;
422         }
423 
424         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
425         if (ret) {
426                 kfree(sdata);
427                 return ret;
428         }
429 
430         mutex_lock(&local->iflist_mtx);
431         rcu_assign_pointer(local->monitor_sdata, sdata);
432         mutex_unlock(&local->iflist_mtx);
433 
434         mutex_lock(&local->mtx);
435         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
436                                         IEEE80211_CHANCTX_EXCLUSIVE);
437         mutex_unlock(&local->mtx);
438         if (ret) {
439                 mutex_lock(&local->iflist_mtx);
440                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
441                 mutex_unlock(&local->iflist_mtx);
442                 synchronize_net();
443                 drv_remove_interface(local, sdata);
444                 kfree(sdata);
445                 return ret;
446         }
447 
448         skb_queue_head_init(&sdata->skb_queue);
449         INIT_WORK(&sdata->work, ieee80211_iface_work);
450 
451         return 0;
452 }
453 
454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
455 {
456         struct ieee80211_sub_if_data *sdata;
457 
458         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
459                 return;
460 
461         ASSERT_RTNL();
462 
463         mutex_lock(&local->iflist_mtx);
464 
465         sdata = rcu_dereference_protected(local->monitor_sdata,
466                                           lockdep_is_held(&local->iflist_mtx));
467         if (!sdata) {
468                 mutex_unlock(&local->iflist_mtx);
469                 return;
470         }
471 
472         RCU_INIT_POINTER(local->monitor_sdata, NULL);
473         mutex_unlock(&local->iflist_mtx);
474 
475         synchronize_net();
476 
477         mutex_lock(&local->mtx);
478         ieee80211_vif_release_channel(sdata);
479         mutex_unlock(&local->mtx);
480 
481         drv_remove_interface(local, sdata);
482 
483         kfree(sdata);
484 }
485 
486 /*
487  * NOTE: Be very careful when changing this function, it must NOT return
488  * an error on interface type changes that have been pre-checked, so most
489  * checks should be in ieee80211_check_concurrent_iface.
490  */
491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
492 {
493         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
494         struct net_device *dev = wdev->netdev;
495         struct ieee80211_local *local = sdata->local;
496         struct sta_info *sta;
497         u32 changed = 0;
498         int res;
499         u32 hw_reconf_flags = 0;
500 
501         switch (sdata->vif.type) {
502         case NL80211_IFTYPE_WDS:
503                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
504                         return -ENOLINK;
505                 break;
506         case NL80211_IFTYPE_AP_VLAN: {
507                 struct ieee80211_sub_if_data *master;
508 
509                 if (!sdata->bss)
510                         return -ENOLINK;
511 
512                 mutex_lock(&local->mtx);
513                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
514                 mutex_unlock(&local->mtx);
515 
516                 master = container_of(sdata->bss,
517                                       struct ieee80211_sub_if_data, u.ap);
518                 sdata->control_port_protocol =
519                         master->control_port_protocol;
520                 sdata->control_port_no_encrypt =
521                         master->control_port_no_encrypt;
522                 sdata->control_port_over_nl80211 =
523                         master->control_port_over_nl80211;
524                 sdata->vif.cab_queue = master->vif.cab_queue;
525                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
526                        sizeof(sdata->vif.hw_queue));
527                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
528 
529                 mutex_lock(&local->key_mtx);
530                 sdata->crypto_tx_tailroom_needed_cnt +=
531                         master->crypto_tx_tailroom_needed_cnt;
532                 mutex_unlock(&local->key_mtx);
533 
534                 break;
535                 }
536         case NL80211_IFTYPE_AP:
537                 sdata->bss = &sdata->u.ap;
538                 break;
539         case NL80211_IFTYPE_MESH_POINT:
540         case NL80211_IFTYPE_STATION:
541         case NL80211_IFTYPE_MONITOR:
542         case NL80211_IFTYPE_ADHOC:
543         case NL80211_IFTYPE_P2P_DEVICE:
544         case NL80211_IFTYPE_OCB:
545         case NL80211_IFTYPE_NAN:
546                 /* no special treatment */
547                 break;
548         case NL80211_IFTYPE_UNSPECIFIED:
549         case NUM_NL80211_IFTYPES:
550         case NL80211_IFTYPE_P2P_CLIENT:
551         case NL80211_IFTYPE_P2P_GO:
552                 /* cannot happen */
553                 WARN_ON(1);
554                 break;
555         }
556 
557         if (local->open_count == 0) {
558                 res = drv_start(local);
559                 if (res)
560                         goto err_del_bss;
561                 /* we're brought up, everything changes */
562                 hw_reconf_flags = ~0;
563                 ieee80211_led_radio(local, true);
564                 ieee80211_mod_tpt_led_trig(local,
565                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
566         }
567 
568         /*
569          * Copy the hopefully now-present MAC address to
570          * this interface, if it has the special null one.
571          */
572         if (dev && is_zero_ether_addr(dev->dev_addr)) {
573                 memcpy(dev->dev_addr,
574                        local->hw.wiphy->perm_addr,
575                        ETH_ALEN);
576                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
577 
578                 if (!is_valid_ether_addr(dev->dev_addr)) {
579                         res = -EADDRNOTAVAIL;
580                         goto err_stop;
581                 }
582         }
583 
584         switch (sdata->vif.type) {
585         case NL80211_IFTYPE_AP_VLAN:
586                 /* no need to tell driver, but set carrier and chanctx */
587                 if (rtnl_dereference(sdata->bss->beacon)) {
588                         ieee80211_vif_vlan_copy_chanctx(sdata);
589                         netif_carrier_on(dev);
590                 } else {
591                         netif_carrier_off(dev);
592                 }
593                 break;
594         case NL80211_IFTYPE_MONITOR:
595                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
596                         local->cooked_mntrs++;
597                         break;
598                 }
599 
600                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
601                         res = drv_add_interface(local, sdata);
602                         if (res)
603                                 goto err_stop;
604                 } else if (local->monitors == 0 && local->open_count == 0) {
605                         res = ieee80211_add_virtual_monitor(local);
606                         if (res)
607                                 goto err_stop;
608                 }
609 
610                 /* must be before the call to ieee80211_configure_filter */
611                 local->monitors++;
612                 if (local->monitors == 1) {
613                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
614                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
615                 }
616 
617                 ieee80211_adjust_monitor_flags(sdata, 1);
618                 ieee80211_configure_filter(local);
619                 mutex_lock(&local->mtx);
620                 ieee80211_recalc_idle(local);
621                 mutex_unlock(&local->mtx);
622 
623                 netif_carrier_on(dev);
624                 break;
625         default:
626                 if (coming_up) {
627                         ieee80211_del_virtual_monitor(local);
628 
629                         res = drv_add_interface(local, sdata);
630                         if (res)
631                                 goto err_stop;
632                         res = ieee80211_check_queues(sdata,
633                                 ieee80211_vif_type_p2p(&sdata->vif));
634                         if (res)
635                                 goto err_del_interface;
636                 }
637 
638                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
639                         local->fif_pspoll++;
640                         local->fif_probe_req++;
641 
642                         ieee80211_configure_filter(local);
643                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
644                         local->fif_probe_req++;
645                 }
646 
647                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
648                     sdata->vif.type != NL80211_IFTYPE_NAN)
649                         changed |= ieee80211_reset_erp_info(sdata);
650                 ieee80211_bss_info_change_notify(sdata, changed);
651 
652                 switch (sdata->vif.type) {
653                 case NL80211_IFTYPE_STATION:
654                 case NL80211_IFTYPE_ADHOC:
655                 case NL80211_IFTYPE_AP:
656                 case NL80211_IFTYPE_MESH_POINT:
657                 case NL80211_IFTYPE_OCB:
658                         netif_carrier_off(dev);
659                         break;
660                 case NL80211_IFTYPE_WDS:
661                 case NL80211_IFTYPE_P2P_DEVICE:
662                 case NL80211_IFTYPE_NAN:
663                         break;
664                 default:
665                         /* not reached */
666                         WARN_ON(1);
667                 }
668 
669                 /*
670                  * Set default queue parameters so drivers don't
671                  * need to initialise the hardware if the hardware
672                  * doesn't start up with sane defaults.
673                  * Enable QoS for anything but station interfaces.
674                  */
675                 ieee80211_set_wmm_default(sdata, true,
676                         sdata->vif.type != NL80211_IFTYPE_STATION);
677         }
678 
679         set_bit(SDATA_STATE_RUNNING, &sdata->state);
680 
681         switch (sdata->vif.type) {
682         case NL80211_IFTYPE_WDS:
683                 /* Create STA entry for the WDS peer */
684                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
685                                      GFP_KERNEL);
686                 if (!sta) {
687                         res = -ENOMEM;
688                         goto err_del_interface;
689                 }
690 
691                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
692                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
693                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
694 
695                 res = sta_info_insert(sta);
696                 if (res) {
697                         /* STA has been freed */
698                         goto err_del_interface;
699                 }
700 
701                 rate_control_rate_init(sta);
702                 netif_carrier_on(dev);
703                 break;
704         case NL80211_IFTYPE_P2P_DEVICE:
705                 rcu_assign_pointer(local->p2p_sdata, sdata);
706                 break;
707         case NL80211_IFTYPE_MONITOR:
708                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
709                         break;
710                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
711                 break;
712         default:
713                 break;
714         }
715 
716         /*
717          * set_multicast_list will be invoked by the networking core
718          * which will check whether any increments here were done in
719          * error and sync them down to the hardware as filter flags.
720          */
721         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
722                 atomic_inc(&local->iff_allmultis);
723 
724         if (coming_up)
725                 local->open_count++;
726 
727         if (hw_reconf_flags)
728                 ieee80211_hw_config(local, hw_reconf_flags);
729 
730         ieee80211_recalc_ps(local);
731 
732         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
733             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
734             local->ops->wake_tx_queue) {
735                 /* XXX: for AP_VLAN, actually track AP queues */
736                 if (dev)
737                         netif_tx_start_all_queues(dev);
738         } else if (dev) {
739                 unsigned long flags;
740                 int n_acs = IEEE80211_NUM_ACS;
741                 int ac;
742 
743                 if (local->hw.queues < IEEE80211_NUM_ACS)
744                         n_acs = 1;
745 
746                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
747                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
748                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
749                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
750                         for (ac = 0; ac < n_acs; ac++) {
751                                 int ac_queue = sdata->vif.hw_queue[ac];
752 
753                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
754                                     skb_queue_empty(&local->pending[ac_queue]))
755                                         netif_start_subqueue(dev, ac);
756                         }
757                 }
758                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
759         }
760 
761         return 0;
762  err_del_interface:
763         drv_remove_interface(local, sdata);
764  err_stop:
765         if (!local->open_count)
766                 drv_stop(local);
767  err_del_bss:
768         sdata->bss = NULL;
769         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
770                 mutex_lock(&local->mtx);
771                 list_del(&sdata->u.vlan.list);
772                 mutex_unlock(&local->mtx);
773         }
774         /* might already be clear but that doesn't matter */
775         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
776         return res;
777 }
778 
779 static int ieee80211_open(struct net_device *dev)
780 {
781         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
782         int err;
783 
784         /* fail early if user set an invalid address */
785         if (!is_valid_ether_addr(dev->dev_addr))
786                 return -EADDRNOTAVAIL;
787 
788         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
789         if (err)
790                 return err;
791 
792         return ieee80211_do_open(&sdata->wdev, true);
793 }
794 
795 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
796                               bool going_down)
797 {
798         struct ieee80211_local *local = sdata->local;
799         unsigned long flags;
800         struct sk_buff *skb, *tmp;
801         u32 hw_reconf_flags = 0;
802         int i, flushed;
803         struct ps_data *ps;
804         struct cfg80211_chan_def chandef;
805         bool cancel_scan;
806         struct cfg80211_nan_func *func;
807 
808         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
809 
810         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
811         if (cancel_scan)
812                 ieee80211_scan_cancel(local);
813 
814         /*
815          * Stop TX on this interface first.
816          */
817         if (sdata->dev)
818                 netif_tx_stop_all_queues(sdata->dev);
819 
820         ieee80211_roc_purge(local, sdata);
821 
822         switch (sdata->vif.type) {
823         case NL80211_IFTYPE_STATION:
824                 ieee80211_mgd_stop(sdata);
825                 break;
826         case NL80211_IFTYPE_ADHOC:
827                 ieee80211_ibss_stop(sdata);
828                 break;
829         case NL80211_IFTYPE_AP:
830                 cancel_work_sync(&sdata->u.ap.request_smps_work);
831                 break;
832         case NL80211_IFTYPE_MONITOR:
833                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
834                         break;
835                 list_del_rcu(&sdata->u.mntr.list);
836                 break;
837         default:
838                 break;
839         }
840 
841         /*
842          * Remove all stations associated with this interface.
843          *
844          * This must be done before calling ops->remove_interface()
845          * because otherwise we can later invoke ops->sta_notify()
846          * whenever the STAs are removed, and that invalidates driver
847          * assumptions about always getting a vif pointer that is valid
848          * (because if we remove a STA after ops->remove_interface()
849          * the driver will have removed the vif info already!)
850          *
851          * In WDS mode a station must exist here and be flushed, for
852          * AP_VLANs stations may exist since there's nothing else that
853          * would have removed them, but in other modes there shouldn't
854          * be any stations.
855          */
856         flushed = sta_info_flush(sdata);
857         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
858                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
859                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
860 
861         /* don't count this interface for allmulti while it is down */
862         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
863                 atomic_dec(&local->iff_allmultis);
864 
865         if (sdata->vif.type == NL80211_IFTYPE_AP) {
866                 local->fif_pspoll--;
867                 local->fif_probe_req--;
868         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
869                 local->fif_probe_req--;
870         }
871 
872         if (sdata->dev) {
873                 netif_addr_lock_bh(sdata->dev);
874                 spin_lock_bh(&local->filter_lock);
875                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
876                                  sdata->dev->addr_len);
877                 spin_unlock_bh(&local->filter_lock);
878                 netif_addr_unlock_bh(sdata->dev);
879         }
880 
881         del_timer_sync(&local->dynamic_ps_timer);
882         cancel_work_sync(&local->dynamic_ps_enable_work);
883 
884         cancel_work_sync(&sdata->recalc_smps);
885         sdata_lock(sdata);
886         mutex_lock(&local->mtx);
887         sdata->vif.csa_active = false;
888         if (sdata->vif.type == NL80211_IFTYPE_STATION)
889                 sdata->u.mgd.csa_waiting_bcn = false;
890         if (sdata->csa_block_tx) {
891                 ieee80211_wake_vif_queues(local, sdata,
892                                           IEEE80211_QUEUE_STOP_REASON_CSA);
893                 sdata->csa_block_tx = false;
894         }
895         mutex_unlock(&local->mtx);
896         sdata_unlock(sdata);
897 
898         cancel_work_sync(&sdata->csa_finalize_work);
899 
900         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
901 
902         if (sdata->wdev.cac_started) {
903                 chandef = sdata->vif.bss_conf.chandef;
904                 WARN_ON(local->suspended);
905                 mutex_lock(&local->mtx);
906                 ieee80211_vif_release_channel(sdata);
907                 mutex_unlock(&local->mtx);
908                 cfg80211_cac_event(sdata->dev, &chandef,
909                                    NL80211_RADAR_CAC_ABORTED,
910                                    GFP_KERNEL);
911         }
912 
913         /* APs need special treatment */
914         if (sdata->vif.type == NL80211_IFTYPE_AP) {
915                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
916 
917                 /* down all dependent devices, that is VLANs */
918                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
919                                          u.vlan.list)
920                         dev_close(vlan->dev);
921                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
922         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
923                 /* remove all packets in parent bc_buf pointing to this dev */
924                 ps = &sdata->bss->ps;
925 
926                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
927                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
928                         if (skb->dev == sdata->dev) {
929                                 __skb_unlink(skb, &ps->bc_buf);
930                                 local->total_ps_buffered--;
931                                 ieee80211_free_txskb(&local->hw, skb);
932                         }
933                 }
934                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
935         }
936 
937         if (going_down)
938                 local->open_count--;
939 
940         switch (sdata->vif.type) {
941         case NL80211_IFTYPE_AP_VLAN:
942                 mutex_lock(&local->mtx);
943                 list_del(&sdata->u.vlan.list);
944                 mutex_unlock(&local->mtx);
945                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
946                 /* see comment in the default case below */
947                 ieee80211_free_keys(sdata, true);
948                 /* no need to tell driver */
949                 break;
950         case NL80211_IFTYPE_MONITOR:
951                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
952                         local->cooked_mntrs--;
953                         break;
954                 }
955 
956                 local->monitors--;
957                 if (local->monitors == 0) {
958                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
959                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
960                 }
961 
962                 ieee80211_adjust_monitor_flags(sdata, -1);
963                 break;
964         case NL80211_IFTYPE_NAN:
965                 /* clean all the functions */
966                 spin_lock_bh(&sdata->u.nan.func_lock);
967 
968                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
969                         idr_remove(&sdata->u.nan.function_inst_ids, i);
970                         cfg80211_free_nan_func(func);
971                 }
972                 idr_destroy(&sdata->u.nan.function_inst_ids);
973 
974                 spin_unlock_bh(&sdata->u.nan.func_lock);
975                 break;
976         case NL80211_IFTYPE_P2P_DEVICE:
977                 /* relies on synchronize_rcu() below */
978                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
979                 /* fall through */
980         default:
981                 cancel_work_sync(&sdata->work);
982                 /*
983                  * When we get here, the interface is marked down.
984                  * Free the remaining keys, if there are any
985                  * (which can happen in AP mode if userspace sets
986                  * keys before the interface is operating, and maybe
987                  * also in WDS mode)
988                  *
989                  * Force the key freeing to always synchronize_net()
990                  * to wait for the RX path in case it is using this
991                  * interface enqueuing frames at this very time on
992                  * another CPU.
993                  */
994                 ieee80211_free_keys(sdata, true);
995                 skb_queue_purge(&sdata->skb_queue);
996         }
997 
998         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
999         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1000                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1001                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1002                         if (info->control.vif == &sdata->vif) {
1003                                 __skb_unlink(skb, &local->pending[i]);
1004                                 ieee80211_free_txskb(&local->hw, skb);
1005                         }
1006                 }
1007         }
1008         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1009 
1010         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1011                 ieee80211_txq_remove_vlan(local, sdata);
1012 
1013         sdata->bss = NULL;
1014 
1015         if (local->open_count == 0)
1016                 ieee80211_clear_tx_pending(local);
1017 
1018         /*
1019          * If the interface goes down while suspended, presumably because
1020          * the device was unplugged and that happens before our resume,
1021          * then the driver is already unconfigured and the remainder of
1022          * this function isn't needed.
1023          * XXX: what about WoWLAN? If the device has software state, e.g.
1024          *      memory allocated, it might expect teardown commands from
1025          *      mac80211 here?
1026          */
1027         if (local->suspended) {
1028                 WARN_ON(local->wowlan);
1029                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1030                 return;
1031         }
1032 
1033         switch (sdata->vif.type) {
1034         case NL80211_IFTYPE_AP_VLAN:
1035                 break;
1036         case NL80211_IFTYPE_MONITOR:
1037                 if (local->monitors == 0)
1038                         ieee80211_del_virtual_monitor(local);
1039 
1040                 mutex_lock(&local->mtx);
1041                 ieee80211_recalc_idle(local);
1042                 mutex_unlock(&local->mtx);
1043 
1044                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1045                         break;
1046 
1047                 /* fall through */
1048         default:
1049                 if (going_down)
1050                         drv_remove_interface(local, sdata);
1051         }
1052 
1053         ieee80211_recalc_ps(local);
1054 
1055         if (cancel_scan)
1056                 flush_delayed_work(&local->scan_work);
1057 
1058         if (local->open_count == 0) {
1059                 ieee80211_stop_device(local);
1060 
1061                 /* no reconfiguring after stop! */
1062                 return;
1063         }
1064 
1065         /* do after stop to avoid reconfiguring when we stop anyway */
1066         ieee80211_configure_filter(local);
1067         ieee80211_hw_config(local, hw_reconf_flags);
1068 
1069         if (local->monitors == local->open_count)
1070                 ieee80211_add_virtual_monitor(local);
1071 }
1072 
1073 static int ieee80211_stop(struct net_device *dev)
1074 {
1075         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1076 
1077         ieee80211_do_stop(sdata, true);
1078 
1079         return 0;
1080 }
1081 
1082 static void ieee80211_set_multicast_list(struct net_device *dev)
1083 {
1084         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1085         struct ieee80211_local *local = sdata->local;
1086         int allmulti, sdata_allmulti;
1087 
1088         allmulti = !!(dev->flags & IFF_ALLMULTI);
1089         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1090 
1091         if (allmulti != sdata_allmulti) {
1092                 if (dev->flags & IFF_ALLMULTI)
1093                         atomic_inc(&local->iff_allmultis);
1094                 else
1095                         atomic_dec(&local->iff_allmultis);
1096                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1097         }
1098 
1099         spin_lock_bh(&local->filter_lock);
1100         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1101         spin_unlock_bh(&local->filter_lock);
1102         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1103 }
1104 
1105 /*
1106  * Called when the netdev is removed or, by the code below, before
1107  * the interface type changes.
1108  */
1109 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1110 {
1111         int i;
1112 
1113         /* free extra data */
1114         ieee80211_free_keys(sdata, false);
1115 
1116         ieee80211_debugfs_remove_netdev(sdata);
1117 
1118         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1119                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1120         sdata->fragment_next = 0;
1121 
1122         if (ieee80211_vif_is_mesh(&sdata->vif))
1123                 ieee80211_mesh_teardown_sdata(sdata);
1124 }
1125 
1126 static void ieee80211_uninit(struct net_device *dev)
1127 {
1128         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1129 }
1130 
1131 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1132                                          struct sk_buff *skb,
1133                                          struct net_device *sb_dev,
1134                                          select_queue_fallback_t fallback)
1135 {
1136         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1137 }
1138 
1139 static void
1140 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1141 {
1142         int i;
1143 
1144         for_each_possible_cpu(i) {
1145                 const struct pcpu_sw_netstats *tstats;
1146                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1147                 unsigned int start;
1148 
1149                 tstats = per_cpu_ptr(dev->tstats, i);
1150 
1151                 do {
1152                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1153                         rx_packets = tstats->rx_packets;
1154                         tx_packets = tstats->tx_packets;
1155                         rx_bytes = tstats->rx_bytes;
1156                         tx_bytes = tstats->tx_bytes;
1157                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1158 
1159                 stats->rx_packets += rx_packets;
1160                 stats->tx_packets += tx_packets;
1161                 stats->rx_bytes   += rx_bytes;
1162                 stats->tx_bytes   += tx_bytes;
1163         }
1164 }
1165 
1166 static const struct net_device_ops ieee80211_dataif_ops = {
1167         .ndo_open               = ieee80211_open,
1168         .ndo_stop               = ieee80211_stop,
1169         .ndo_uninit             = ieee80211_uninit,
1170         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1171         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1172         .ndo_set_mac_address    = ieee80211_change_mac,
1173         .ndo_select_queue       = ieee80211_netdev_select_queue,
1174         .ndo_get_stats64        = ieee80211_get_stats64,
1175 };
1176 
1177 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1178                                           struct sk_buff *skb,
1179                                           struct net_device *sb_dev,
1180                                           select_queue_fallback_t fallback)
1181 {
1182         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1183         struct ieee80211_local *local = sdata->local;
1184         struct ieee80211_hdr *hdr;
1185         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1186 
1187         if (local->hw.queues < IEEE80211_NUM_ACS)
1188                 return 0;
1189 
1190         if (skb->len < 4 ||
1191             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1192                 return 0; /* doesn't matter, frame will be dropped */
1193 
1194         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1195 
1196         return ieee80211_select_queue_80211(sdata, skb, hdr);
1197 }
1198 
1199 static const struct net_device_ops ieee80211_monitorif_ops = {
1200         .ndo_open               = ieee80211_open,
1201         .ndo_stop               = ieee80211_stop,
1202         .ndo_uninit             = ieee80211_uninit,
1203         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1204         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1205         .ndo_set_mac_address    = ieee80211_change_mac,
1206         .ndo_select_queue       = ieee80211_monitor_select_queue,
1207         .ndo_get_stats64        = ieee80211_get_stats64,
1208 };
1209 
1210 static void ieee80211_if_free(struct net_device *dev)
1211 {
1212         free_percpu(dev->tstats);
1213 }
1214 
1215 static void ieee80211_if_setup(struct net_device *dev)
1216 {
1217         ether_setup(dev);
1218         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1219         dev->netdev_ops = &ieee80211_dataif_ops;
1220         dev->needs_free_netdev = true;
1221         dev->priv_destructor = ieee80211_if_free;
1222 }
1223 
1224 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1225 {
1226         ieee80211_if_setup(dev);
1227         dev->priv_flags |= IFF_NO_QUEUE;
1228 }
1229 
1230 static void ieee80211_iface_work(struct work_struct *work)
1231 {
1232         struct ieee80211_sub_if_data *sdata =
1233                 container_of(work, struct ieee80211_sub_if_data, work);
1234         struct ieee80211_local *local = sdata->local;
1235         struct sk_buff *skb;
1236         struct sta_info *sta;
1237 
1238         if (!ieee80211_sdata_running(sdata))
1239                 return;
1240 
1241         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1242                 return;
1243 
1244         if (!ieee80211_can_run_worker(local))
1245                 return;
1246 
1247         /* first process frames */
1248         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1249                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1250 
1251                 if (ieee80211_is_action(mgmt->frame_control) &&
1252                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1253                         int len = skb->len;
1254 
1255                         mutex_lock(&local->sta_mtx);
1256                         sta = sta_info_get_bss(sdata, mgmt->sa);
1257                         if (sta) {
1258                                 switch (mgmt->u.action.u.addba_req.action_code) {
1259                                 case WLAN_ACTION_ADDBA_REQ:
1260                                         ieee80211_process_addba_request(
1261                                                         local, sta, mgmt, len);
1262                                         break;
1263                                 case WLAN_ACTION_ADDBA_RESP:
1264                                         ieee80211_process_addba_resp(local, sta,
1265                                                                      mgmt, len);
1266                                         break;
1267                                 case WLAN_ACTION_DELBA:
1268                                         ieee80211_process_delba(sdata, sta,
1269                                                                 mgmt, len);
1270                                         break;
1271                                 default:
1272                                         WARN_ON(1);
1273                                         break;
1274                                 }
1275                         }
1276                         mutex_unlock(&local->sta_mtx);
1277                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1278                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1279                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1280                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1281                                 struct ieee80211_rx_status *status;
1282                                 enum nl80211_band band;
1283                                 u8 opmode;
1284 
1285                                 status = IEEE80211_SKB_RXCB(skb);
1286                                 band = status->band;
1287                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1288 
1289                                 mutex_lock(&local->sta_mtx);
1290                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1291 
1292                                 if (sta)
1293                                         ieee80211_vht_handle_opmode(sdata, sta,
1294                                                                     opmode,
1295                                                                     band);
1296 
1297                                 mutex_unlock(&local->sta_mtx);
1298                                 break;
1299                         }
1300                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1301                                 ieee80211_process_mu_groups(sdata, mgmt);
1302                                 break;
1303                         default:
1304                                 WARN_ON(1);
1305                                 break;
1306                         }
1307                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1308                         struct ieee80211_hdr *hdr = (void *)mgmt;
1309                         /*
1310                          * So the frame isn't mgmt, but frame_control
1311                          * is at the right place anyway, of course, so
1312                          * the if statement is correct.
1313                          *
1314                          * Warn if we have other data frame types here,
1315                          * they must not get here.
1316                          */
1317                         WARN_ON(hdr->frame_control &
1318                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1319                         WARN_ON(!(hdr->seq_ctrl &
1320                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1321                         /*
1322                          * This was a fragment of a frame, received while
1323                          * a block-ack session was active. That cannot be
1324                          * right, so terminate the session.
1325                          */
1326                         mutex_lock(&local->sta_mtx);
1327                         sta = sta_info_get_bss(sdata, mgmt->sa);
1328                         if (sta) {
1329                                 u16 tid = ieee80211_get_tid(hdr);
1330 
1331                                 __ieee80211_stop_rx_ba_session(
1332                                         sta, tid, WLAN_BACK_RECIPIENT,
1333                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1334                                         true);
1335                         }
1336                         mutex_unlock(&local->sta_mtx);
1337                 } else switch (sdata->vif.type) {
1338                 case NL80211_IFTYPE_STATION:
1339                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1340                         break;
1341                 case NL80211_IFTYPE_ADHOC:
1342                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1343                         break;
1344                 case NL80211_IFTYPE_MESH_POINT:
1345                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1346                                 break;
1347                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1348                         break;
1349                 default:
1350                         WARN(1, "frame for unexpected interface type");
1351                         break;
1352                 }
1353 
1354                 kfree_skb(skb);
1355         }
1356 
1357         /* then other type-dependent work */
1358         switch (sdata->vif.type) {
1359         case NL80211_IFTYPE_STATION:
1360                 ieee80211_sta_work(sdata);
1361                 break;
1362         case NL80211_IFTYPE_ADHOC:
1363                 ieee80211_ibss_work(sdata);
1364                 break;
1365         case NL80211_IFTYPE_MESH_POINT:
1366                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1367                         break;
1368                 ieee80211_mesh_work(sdata);
1369                 break;
1370         case NL80211_IFTYPE_OCB:
1371                 ieee80211_ocb_work(sdata);
1372                 break;
1373         default:
1374                 break;
1375         }
1376 }
1377 
1378 static void ieee80211_recalc_smps_work(struct work_struct *work)
1379 {
1380         struct ieee80211_sub_if_data *sdata =
1381                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1382 
1383         ieee80211_recalc_smps(sdata);
1384 }
1385 
1386 /*
1387  * Helper function to initialise an interface to a specific type.
1388  */
1389 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1390                                   enum nl80211_iftype type)
1391 {
1392         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1393                                                     0xff, 0xff, 0xff};
1394 
1395         /* clear type-dependent union */
1396         memset(&sdata->u, 0, sizeof(sdata->u));
1397 
1398         /* and set some type-dependent values */
1399         sdata->vif.type = type;
1400         sdata->vif.p2p = false;
1401         sdata->wdev.iftype = type;
1402 
1403         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1404         sdata->control_port_no_encrypt = false;
1405         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1406         sdata->vif.bss_conf.idle = true;
1407 
1408         sdata->noack_map = 0;
1409 
1410         /* only monitor/p2p-device differ */
1411         if (sdata->dev) {
1412                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1413                 sdata->dev->type = ARPHRD_ETHER;
1414         }
1415 
1416         skb_queue_head_init(&sdata->skb_queue);
1417         INIT_WORK(&sdata->work, ieee80211_iface_work);
1418         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1419         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1420         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1421         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1422 
1423         switch (type) {
1424         case NL80211_IFTYPE_P2P_GO:
1425                 type = NL80211_IFTYPE_AP;
1426                 sdata->vif.type = type;
1427                 sdata->vif.p2p = true;
1428                 /* fall through */
1429         case NL80211_IFTYPE_AP:
1430                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1431                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1432                 INIT_WORK(&sdata->u.ap.request_smps_work,
1433                           ieee80211_request_smps_ap_work);
1434                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1435                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1436                 break;
1437         case NL80211_IFTYPE_P2P_CLIENT:
1438                 type = NL80211_IFTYPE_STATION;
1439                 sdata->vif.type = type;
1440                 sdata->vif.p2p = true;
1441                 /* fall through */
1442         case NL80211_IFTYPE_STATION:
1443                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1444                 ieee80211_sta_setup_sdata(sdata);
1445                 break;
1446         case NL80211_IFTYPE_OCB:
1447                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1448                 ieee80211_ocb_setup_sdata(sdata);
1449                 break;
1450         case NL80211_IFTYPE_ADHOC:
1451                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1452                 ieee80211_ibss_setup_sdata(sdata);
1453                 break;
1454         case NL80211_IFTYPE_MESH_POINT:
1455                 if (ieee80211_vif_is_mesh(&sdata->vif))
1456                         ieee80211_mesh_init_sdata(sdata);
1457                 break;
1458         case NL80211_IFTYPE_MONITOR:
1459                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1460                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1461                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1462                                       MONITOR_FLAG_OTHER_BSS;
1463                 break;
1464         case NL80211_IFTYPE_WDS:
1465                 sdata->vif.bss_conf.bssid = NULL;
1466                 break;
1467         case NL80211_IFTYPE_NAN:
1468                 idr_init(&sdata->u.nan.function_inst_ids);
1469                 spin_lock_init(&sdata->u.nan.func_lock);
1470                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1471                 break;
1472         case NL80211_IFTYPE_AP_VLAN:
1473         case NL80211_IFTYPE_P2P_DEVICE:
1474                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1475                 break;
1476         case NL80211_IFTYPE_UNSPECIFIED:
1477         case NUM_NL80211_IFTYPES:
1478                 WARN_ON(1);
1479                 break;
1480         }
1481 
1482         ieee80211_debugfs_add_netdev(sdata);
1483 }
1484 
1485 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1486                                            enum nl80211_iftype type)
1487 {
1488         struct ieee80211_local *local = sdata->local;
1489         int ret, err;
1490         enum nl80211_iftype internal_type = type;
1491         bool p2p = false;
1492 
1493         ASSERT_RTNL();
1494 
1495         if (!local->ops->change_interface)
1496                 return -EBUSY;
1497 
1498         switch (sdata->vif.type) {
1499         case NL80211_IFTYPE_AP:
1500         case NL80211_IFTYPE_STATION:
1501         case NL80211_IFTYPE_ADHOC:
1502         case NL80211_IFTYPE_OCB:
1503                 /*
1504                  * Could maybe also all others here?
1505                  * Just not sure how that interacts
1506                  * with the RX/config path e.g. for
1507                  * mesh.
1508                  */
1509                 break;
1510         default:
1511                 return -EBUSY;
1512         }
1513 
1514         switch (type) {
1515         case NL80211_IFTYPE_AP:
1516         case NL80211_IFTYPE_STATION:
1517         case NL80211_IFTYPE_ADHOC:
1518         case NL80211_IFTYPE_OCB:
1519                 /*
1520                  * Could probably support everything
1521                  * but WDS here (WDS do_open can fail
1522                  * under memory pressure, which this
1523                  * code isn't prepared to handle).
1524                  */
1525                 break;
1526         case NL80211_IFTYPE_P2P_CLIENT:
1527                 p2p = true;
1528                 internal_type = NL80211_IFTYPE_STATION;
1529                 break;
1530         case NL80211_IFTYPE_P2P_GO:
1531                 p2p = true;
1532                 internal_type = NL80211_IFTYPE_AP;
1533                 break;
1534         default:
1535                 return -EBUSY;
1536         }
1537 
1538         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1539         if (ret)
1540                 return ret;
1541 
1542         ieee80211_do_stop(sdata, false);
1543 
1544         ieee80211_teardown_sdata(sdata);
1545 
1546         ret = drv_change_interface(local, sdata, internal_type, p2p);
1547         if (ret)
1548                 type = ieee80211_vif_type_p2p(&sdata->vif);
1549 
1550         /*
1551          * Ignore return value here, there's not much we can do since
1552          * the driver changed the interface type internally already.
1553          * The warnings will hopefully make driver authors fix it :-)
1554          */
1555         ieee80211_check_queues(sdata, type);
1556 
1557         ieee80211_setup_sdata(sdata, type);
1558 
1559         err = ieee80211_do_open(&sdata->wdev, false);
1560         WARN(err, "type change: do_open returned %d", err);
1561 
1562         return ret;
1563 }
1564 
1565 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1566                              enum nl80211_iftype type)
1567 {
1568         int ret;
1569 
1570         ASSERT_RTNL();
1571 
1572         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1573                 return 0;
1574 
1575         if (ieee80211_sdata_running(sdata)) {
1576                 ret = ieee80211_runtime_change_iftype(sdata, type);
1577                 if (ret)
1578                         return ret;
1579         } else {
1580                 /* Purge and reset type-dependent state. */
1581                 ieee80211_teardown_sdata(sdata);
1582                 ieee80211_setup_sdata(sdata, type);
1583         }
1584 
1585         /* reset some values that shouldn't be kept across type changes */
1586         if (type == NL80211_IFTYPE_STATION)
1587                 sdata->u.mgd.use_4addr = false;
1588 
1589         return 0;
1590 }
1591 
1592 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1593                                        u8 *perm_addr, enum nl80211_iftype type)
1594 {
1595         struct ieee80211_sub_if_data *sdata;
1596         u64 mask, start, addr, val, inc;
1597         u8 *m;
1598         u8 tmp_addr[ETH_ALEN];
1599         int i;
1600 
1601         /* default ... something at least */
1602         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1603 
1604         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1605             local->hw.wiphy->n_addresses <= 1)
1606                 return;
1607 
1608         mutex_lock(&local->iflist_mtx);
1609 
1610         switch (type) {
1611         case NL80211_IFTYPE_MONITOR:
1612                 /* doesn't matter */
1613                 break;
1614         case NL80211_IFTYPE_WDS:
1615         case NL80211_IFTYPE_AP_VLAN:
1616                 /* match up with an AP interface */
1617                 list_for_each_entry(sdata, &local->interfaces, list) {
1618                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1619                                 continue;
1620                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1621                         break;
1622                 }
1623                 /* keep default if no AP interface present */
1624                 break;
1625         case NL80211_IFTYPE_P2P_CLIENT:
1626         case NL80211_IFTYPE_P2P_GO:
1627                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1628                         list_for_each_entry(sdata, &local->interfaces, list) {
1629                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1630                                         continue;
1631                                 if (!ieee80211_sdata_running(sdata))
1632                                         continue;
1633                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1634                                 goto out_unlock;
1635                         }
1636                 }
1637                 /* fall through */
1638         default:
1639                 /* assign a new address if possible -- try n_addresses first */
1640                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1641                         bool used = false;
1642 
1643                         list_for_each_entry(sdata, &local->interfaces, list) {
1644                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1645                                                      sdata->vif.addr)) {
1646                                         used = true;
1647                                         break;
1648                                 }
1649                         }
1650 
1651                         if (!used) {
1652                                 memcpy(perm_addr,
1653                                        local->hw.wiphy->addresses[i].addr,
1654                                        ETH_ALEN);
1655                                 break;
1656                         }
1657                 }
1658 
1659                 /* try mask if available */
1660                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1661                         break;
1662 
1663                 m = local->hw.wiphy->addr_mask;
1664                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1665                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1666                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1667 
1668                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1669                         /* not a contiguous mask ... not handled now! */
1670                         pr_info("not contiguous\n");
1671                         break;
1672                 }
1673 
1674                 /*
1675                  * Pick address of existing interface in case user changed
1676                  * MAC address manually, default to perm_addr.
1677                  */
1678                 m = local->hw.wiphy->perm_addr;
1679                 list_for_each_entry(sdata, &local->interfaces, list) {
1680                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1681                                 continue;
1682                         m = sdata->vif.addr;
1683                         break;
1684                 }
1685                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1686                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1687                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1688 
1689                 inc = 1ULL<<__ffs64(mask);
1690                 val = (start & mask);
1691                 addr = (start & ~mask) | (val & mask);
1692                 do {
1693                         bool used = false;
1694 
1695                         tmp_addr[5] = addr >> 0*8;
1696                         tmp_addr[4] = addr >> 1*8;
1697                         tmp_addr[3] = addr >> 2*8;
1698                         tmp_addr[2] = addr >> 3*8;
1699                         tmp_addr[1] = addr >> 4*8;
1700                         tmp_addr[0] = addr >> 5*8;
1701 
1702                         val += inc;
1703 
1704                         list_for_each_entry(sdata, &local->interfaces, list) {
1705                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1706                                         used = true;
1707                                         break;
1708                                 }
1709                         }
1710 
1711                         if (!used) {
1712                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1713                                 break;
1714                         }
1715                         addr = (start & ~mask) | (val & mask);
1716                 } while (addr != start);
1717 
1718                 break;
1719         }
1720 
1721  out_unlock:
1722         mutex_unlock(&local->iflist_mtx);
1723 }
1724 
1725 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1726                      unsigned char name_assign_type,
1727                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1728                      struct vif_params *params)
1729 {
1730         struct net_device *ndev = NULL;
1731         struct ieee80211_sub_if_data *sdata = NULL;
1732         struct txq_info *txqi;
1733         void (*if_setup)(struct net_device *dev);
1734         int ret, i;
1735         int txqs = 1;
1736 
1737         ASSERT_RTNL();
1738 
1739         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1740                 struct wireless_dev *wdev;
1741 
1742                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1743                                 GFP_KERNEL);
1744                 if (!sdata)
1745                         return -ENOMEM;
1746                 wdev = &sdata->wdev;
1747 
1748                 sdata->dev = NULL;
1749                 strlcpy(sdata->name, name, IFNAMSIZ);
1750                 ieee80211_assign_perm_addr(local, wdev->address, type);
1751                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1752         } else {
1753                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1754                                  sizeof(void *));
1755                 int txq_size = 0;
1756 
1757                 if (local->ops->wake_tx_queue &&
1758                     type != NL80211_IFTYPE_AP_VLAN &&
1759                     type != NL80211_IFTYPE_MONITOR)
1760                         txq_size += sizeof(struct txq_info) +
1761                                     local->hw.txq_data_size;
1762 
1763                 if (local->ops->wake_tx_queue)
1764                         if_setup = ieee80211_if_setup_no_queue;
1765                 else
1766                         if_setup = ieee80211_if_setup;
1767 
1768                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1769                         txqs = IEEE80211_NUM_ACS;
1770 
1771                 ndev = alloc_netdev_mqs(size + txq_size,
1772                                         name, name_assign_type,
1773                                         if_setup, txqs, 1);
1774                 if (!ndev)
1775                         return -ENOMEM;
1776                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1777 
1778                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1779                 if (!ndev->tstats) {
1780                         free_netdev(ndev);
1781                         return -ENOMEM;
1782                 }
1783 
1784                 ndev->needed_headroom = local->tx_headroom +
1785                                         4*6 /* four MAC addresses */
1786                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1787                                         + 6 /* mesh */
1788                                         + 8 /* rfc1042/bridge tunnel */
1789                                         - ETH_HLEN /* ethernet hard_header_len */
1790                                         + IEEE80211_ENCRYPT_HEADROOM;
1791                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1792 
1793                 ret = dev_alloc_name(ndev, ndev->name);
1794                 if (ret < 0) {
1795                         ieee80211_if_free(ndev);
1796                         free_netdev(ndev);
1797                         return ret;
1798                 }
1799 
1800                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1801                 if (params && is_valid_ether_addr(params->macaddr))
1802                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1803                 else
1804                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1805                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1806 
1807                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1808                 sdata = netdev_priv(ndev);
1809                 ndev->ieee80211_ptr = &sdata->wdev;
1810                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1811                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1812 
1813                 if (txq_size) {
1814                         txqi = netdev_priv(ndev) + size;
1815                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1816                 }
1817 
1818                 sdata->dev = ndev;
1819         }
1820 
1821         /* initialise type-independent data */
1822         sdata->wdev.wiphy = local->hw.wiphy;
1823         sdata->local = local;
1824 
1825         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1826                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1827 
1828         INIT_LIST_HEAD(&sdata->key_list);
1829 
1830         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1831                           ieee80211_dfs_cac_timer_work);
1832         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1833                           ieee80211_delayed_tailroom_dec);
1834 
1835         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1836                 struct ieee80211_supported_band *sband;
1837                 sband = local->hw.wiphy->bands[i];
1838                 sdata->rc_rateidx_mask[i] =
1839                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1840                 if (sband) {
1841                         __le16 cap;
1842                         u16 *vht_rate_mask;
1843 
1844                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1845                                sband->ht_cap.mcs.rx_mask,
1846                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1847 
1848                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1849                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1850                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1851                 } else {
1852                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1853                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1854                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1855                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1856                 }
1857         }
1858 
1859         ieee80211_set_default_queues(sdata);
1860 
1861         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1862         sdata->user_power_level = local->user_power_level;
1863 
1864         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1865 
1866         /* setup type-dependent data */
1867         ieee80211_setup_sdata(sdata, type);
1868 
1869         if (ndev) {
1870                 if (params) {
1871                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1872                         if (type == NL80211_IFTYPE_STATION)
1873                                 sdata->u.mgd.use_4addr = params->use_4addr;
1874                 }
1875 
1876                 ndev->features |= local->hw.netdev_features;
1877 
1878                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1879 
1880                 /* MTU range: 256 - 2304 */
1881                 ndev->min_mtu = 256;
1882                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1883 
1884                 ret = register_netdevice(ndev);
1885                 if (ret) {
1886                         free_netdev(ndev);
1887                         return ret;
1888                 }
1889         }
1890 
1891         mutex_lock(&local->iflist_mtx);
1892         list_add_tail_rcu(&sdata->list, &local->interfaces);
1893         mutex_unlock(&local->iflist_mtx);
1894 
1895         if (new_wdev)
1896                 *new_wdev = &sdata->wdev;
1897 
1898         return 0;
1899 }
1900 
1901 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1902 {
1903         ASSERT_RTNL();
1904 
1905         mutex_lock(&sdata->local->iflist_mtx);
1906         list_del_rcu(&sdata->list);
1907         mutex_unlock(&sdata->local->iflist_mtx);
1908 
1909         synchronize_rcu();
1910 
1911         if (sdata->dev) {
1912                 unregister_netdevice(sdata->dev);
1913         } else {
1914                 cfg80211_unregister_wdev(&sdata->wdev);
1915                 ieee80211_teardown_sdata(sdata);
1916                 kfree(sdata);
1917         }
1918 }
1919 
1920 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1921 {
1922         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1923                 return;
1924         ieee80211_do_stop(sdata, true);
1925 }
1926 
1927 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1928 {
1929         struct ieee80211_sub_if_data *sdata, *tmp;
1930         LIST_HEAD(unreg_list);
1931         LIST_HEAD(wdev_list);
1932 
1933         ASSERT_RTNL();
1934 
1935         /* Before destroying the interfaces, make sure they're all stopped so
1936          * that the hardware is stopped. Otherwise, the driver might still be
1937          * iterating the interfaces during the shutdown, e.g. from a worker
1938          * or from RX processing or similar, and if it does so (using atomic
1939          * iteration) while we're manipulating the list, the iteration will
1940          * crash.
1941          *
1942          * After this, the hardware should be stopped and the driver should
1943          * have stopped all of its activities, so that we can do RCU-unaware
1944          * manipulations of the interface list below.
1945          */
1946         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1947 
1948         WARN(local->open_count, "%s: open count remains %d\n",
1949              wiphy_name(local->hw.wiphy), local->open_count);
1950 
1951         mutex_lock(&local->iflist_mtx);
1952         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1953                 list_del(&sdata->list);
1954 
1955                 if (sdata->dev)
1956                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1957                 else
1958                         list_add(&sdata->list, &wdev_list);
1959         }
1960         mutex_unlock(&local->iflist_mtx);
1961         unregister_netdevice_many(&unreg_list);
1962 
1963         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1964                 list_del(&sdata->list);
1965                 cfg80211_unregister_wdev(&sdata->wdev);
1966                 kfree(sdata);
1967         }
1968 }
1969 
1970 static int netdev_notify(struct notifier_block *nb,
1971                          unsigned long state, void *ptr)
1972 {
1973         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1974         struct ieee80211_sub_if_data *sdata;
1975 
1976         if (state != NETDEV_CHANGENAME)
1977                 return NOTIFY_DONE;
1978 
1979         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1980                 return NOTIFY_DONE;
1981 
1982         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1983                 return NOTIFY_DONE;
1984 
1985         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1986         memcpy(sdata->name, dev->name, IFNAMSIZ);
1987         ieee80211_debugfs_rename_netdev(sdata);
1988 
1989         return NOTIFY_OK;
1990 }
1991 
1992 static struct notifier_block mac80211_netdev_notifier = {
1993         .notifier_call = netdev_notify,
1994 };
1995 
1996 int ieee80211_iface_init(void)
1997 {
1998         return register_netdevice_notifier(&mac80211_netdev_notifier);
1999 }
2000 
2001 void ieee80211_iface_exit(void)
2002 {
2003         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2004 }
2005 
2006 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2007 {
2008         if (sdata->vif.type == NL80211_IFTYPE_AP)
2009                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2010         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2011                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2012 }
2013 
2014 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2015 {
2016         if (sdata->vif.type == NL80211_IFTYPE_AP)
2017                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2018         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2019                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2020 }
2021 

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