Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

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 static void ieee80211_iface_work(struct work_struct *work);
 47 
 48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 49 {
 50         struct ieee80211_chanctx_conf *chanctx_conf;
 51         int power;
 52 
 53         rcu_read_lock();
 54         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 55         if (!chanctx_conf) {
 56                 rcu_read_unlock();
 57                 return false;
 58         }
 59 
 60         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 61         rcu_read_unlock();
 62 
 63         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 64                 power = min(power, sdata->user_power_level);
 65 
 66         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 67                 power = min(power, sdata->ap_power_level);
 68 
 69         if (power != sdata->vif.bss_conf.txpower) {
 70                 sdata->vif.bss_conf.txpower = power;
 71                 ieee80211_hw_config(sdata->local, 0);
 72                 return true;
 73         }
 74 
 75         return false;
 76 }
 77 
 78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 79                               bool update_bss)
 80 {
 81         if (__ieee80211_recalc_txpower(sdata) ||
 82             (update_bss && ieee80211_sdata_running(sdata)))
 83                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 84 }
 85 
 86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 87 {
 88         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 89                 return 0;
 90 
 91         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 92         return IEEE80211_CONF_CHANGE_IDLE;
 93 }
 94 
 95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 96 {
 97         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 98                 return 0;
 99 
100         ieee80211_flush_queues(local, NULL, false);
101 
102         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103         return IEEE80211_CONF_CHANGE_IDLE;
104 }
105 
106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107                                    bool force_active)
108 {
109         bool working, scanning, active;
110         unsigned int led_trig_start = 0, led_trig_stop = 0;
111 
112         lockdep_assert_held(&local->mtx);
113 
114         active = force_active ||
115                  !list_empty(&local->chanctx_list) ||
116                  local->monitors;
117 
118         working = !local->ops->remain_on_channel &&
119                   !list_empty(&local->roc_list);
120 
121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123 
124         if (working || scanning)
125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126         else
127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128 
129         if (active)
130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131         else
132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133 
134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135 
136         if (working || scanning || active)
137                 return __ieee80211_idle_off(local);
138         return __ieee80211_idle_on(local);
139 }
140 
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143         return __ieee80211_recalc_idle(local, true);
144 }
145 
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148         u32 change = __ieee80211_recalc_idle(local, false);
149         if (change)
150                 ieee80211_hw_config(local, change);
151 }
152 
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156                 return -EINVAL;
157 
158         dev->mtu = new_mtu;
159         return 0;
160 }
161 
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163                                 bool check_dup)
164 {
165         struct ieee80211_local *local = sdata->local;
166         struct ieee80211_sub_if_data *iter;
167         u64 new, mask, tmp;
168         u8 *m;
169         int ret = 0;
170 
171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172                 return 0;
173 
174         m = addr;
175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178 
179         m = local->hw.wiphy->addr_mask;
180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183 
184         if (!check_dup)
185                 return ret;
186 
187         mutex_lock(&local->iflist_mtx);
188         list_for_each_entry(iter, &local->interfaces, list) {
189                 if (iter == sdata)
190                         continue;
191 
192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
194                         continue;
195 
196                 m = iter->vif.addr;
197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200 
201                 if ((new & ~mask) != (tmp & ~mask)) {
202                         ret = -EINVAL;
203                         break;
204                 }
205         }
206         mutex_unlock(&local->iflist_mtx);
207 
208         return ret;
209 }
210 
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214         struct sockaddr *sa = addr;
215         bool check_dup = true;
216         int ret;
217 
218         if (ieee80211_sdata_running(sdata))
219                 return -EBUSY;
220 
221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
223                 check_dup = false;
224 
225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226         if (ret)
227                 return ret;
228 
229         ret = eth_mac_addr(dev, sa);
230 
231         if (ret == 0)
232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233 
234         return ret;
235 }
236 
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239         return type1 == NL80211_IFTYPE_MONITOR ||
240                 type2 == NL80211_IFTYPE_MONITOR ||
241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244                 (type1 == NL80211_IFTYPE_WDS &&
245                         (type2 == NL80211_IFTYPE_WDS ||
246                          type2 == NL80211_IFTYPE_AP)) ||
247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
249                         (type2 == NL80211_IFTYPE_AP ||
250                          type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252 
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254                                             enum nl80211_iftype iftype)
255 {
256         struct ieee80211_local *local = sdata->local;
257         struct ieee80211_sub_if_data *nsdata;
258         int ret;
259 
260         ASSERT_RTNL();
261 
262         /* we hold the RTNL here so can safely walk the list */
263         list_for_each_entry(nsdata, &local->interfaces, list) {
264                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
265                         /*
266                          * Only OCB and monitor mode may coexist
267                          */
268                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
269                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
270                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
271                              nsdata->vif.type == NL80211_IFTYPE_OCB))
272                                 return -EBUSY;
273 
274                         /*
275                          * Allow only a single IBSS interface to be up at any
276                          * time. This is restricted because beacon distribution
277                          * cannot work properly if both are in the same IBSS.
278                          *
279                          * To remove this restriction we'd have to disallow them
280                          * from setting the same SSID on different IBSS interfaces
281                          * belonging to the same hardware. Then, however, we're
282                          * faced with having to adopt two different TSF timers...
283                          */
284                         if (iftype == NL80211_IFTYPE_ADHOC &&
285                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
286                                 return -EBUSY;
287                         /*
288                          * will not add another interface while any channel
289                          * switch is active.
290                          */
291                         if (nsdata->vif.csa_active)
292                                 return -EBUSY;
293 
294                         /*
295                          * The remaining checks are only performed for interfaces
296                          * with the same MAC address.
297                          */
298                         if (!ether_addr_equal(sdata->vif.addr,
299                                               nsdata->vif.addr))
300                                 continue;
301 
302                         /*
303                          * check whether it may have the same address
304                          */
305                         if (!identical_mac_addr_allowed(iftype,
306                                                         nsdata->vif.type))
307                                 return -ENOTUNIQ;
308 
309                         /*
310                          * can only add VLANs to enabled APs
311                          */
312                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
313                             nsdata->vif.type == NL80211_IFTYPE_AP)
314                                 sdata->bss = &nsdata->u.ap;
315                 }
316         }
317 
318         mutex_lock(&local->chanctx_mtx);
319         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
320         mutex_unlock(&local->chanctx_mtx);
321         return ret;
322 }
323 
324 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
325                                   enum nl80211_iftype iftype)
326 {
327         int n_queues = sdata->local->hw.queues;
328         int i;
329 
330         if (iftype == NL80211_IFTYPE_NAN)
331                 return 0;
332 
333         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
334                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
335                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
336                                          IEEE80211_INVAL_HW_QUEUE))
337                                 return -EINVAL;
338                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
339                                          n_queues))
340                                 return -EINVAL;
341                 }
342         }
343 
344         if ((iftype != NL80211_IFTYPE_AP &&
345              iftype != NL80211_IFTYPE_P2P_GO &&
346              iftype != NL80211_IFTYPE_MESH_POINT) ||
347             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
348                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
349                 return 0;
350         }
351 
352         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
353                 return -EINVAL;
354 
355         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
356                 return -EINVAL;
357 
358         return 0;
359 }
360 
361 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
362                                     const int offset)
363 {
364         struct ieee80211_local *local = sdata->local;
365         u32 flags = sdata->u.mntr.flags;
366 
367 #define ADJUST(_f, _s)  do {                                    \
368         if (flags & MONITOR_FLAG_##_f)                          \
369                 local->fif_##_s += offset;                      \
370         } while (0)
371 
372         ADJUST(FCSFAIL, fcsfail);
373         ADJUST(PLCPFAIL, plcpfail);
374         ADJUST(CONTROL, control);
375         ADJUST(CONTROL, pspoll);
376         ADJUST(OTHER_BSS, other_bss);
377 
378 #undef ADJUST
379 }
380 
381 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
382 {
383         struct ieee80211_local *local = sdata->local;
384         int i;
385 
386         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
387                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
388                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
389                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
390                         sdata->vif.hw_queue[i] = i;
391                 else
392                         sdata->vif.hw_queue[i] = 0;
393         }
394         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
395 }
396 
397 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
398 {
399         struct ieee80211_sub_if_data *sdata;
400         int ret;
401 
402         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
403                 return 0;
404 
405         ASSERT_RTNL();
406 
407         if (local->monitor_sdata)
408                 return 0;
409 
410         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
411         if (!sdata)
412                 return -ENOMEM;
413 
414         /* set up data */
415         sdata->local = local;
416         sdata->vif.type = NL80211_IFTYPE_MONITOR;
417         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
418                  wiphy_name(local->hw.wiphy));
419         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
420 
421         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
422 
423         ieee80211_set_default_queues(sdata);
424 
425         ret = drv_add_interface(local, sdata);
426         if (WARN_ON(ret)) {
427                 /* ok .. stupid driver, it asked for this! */
428                 kfree(sdata);
429                 return ret;
430         }
431 
432         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
433         if (ret) {
434                 kfree(sdata);
435                 return ret;
436         }
437 
438         mutex_lock(&local->iflist_mtx);
439         rcu_assign_pointer(local->monitor_sdata, sdata);
440         mutex_unlock(&local->iflist_mtx);
441 
442         mutex_lock(&local->mtx);
443         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
444                                         IEEE80211_CHANCTX_EXCLUSIVE);
445         mutex_unlock(&local->mtx);
446         if (ret) {
447                 mutex_lock(&local->iflist_mtx);
448                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
449                 mutex_unlock(&local->iflist_mtx);
450                 synchronize_net();
451                 drv_remove_interface(local, sdata);
452                 kfree(sdata);
453                 return ret;
454         }
455 
456         skb_queue_head_init(&sdata->skb_queue);
457         INIT_WORK(&sdata->work, ieee80211_iface_work);
458 
459         return 0;
460 }
461 
462 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
463 {
464         struct ieee80211_sub_if_data *sdata;
465 
466         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
467                 return;
468 
469         ASSERT_RTNL();
470 
471         mutex_lock(&local->iflist_mtx);
472 
473         sdata = rcu_dereference_protected(local->monitor_sdata,
474                                           lockdep_is_held(&local->iflist_mtx));
475         if (!sdata) {
476                 mutex_unlock(&local->iflist_mtx);
477                 return;
478         }
479 
480         RCU_INIT_POINTER(local->monitor_sdata, NULL);
481         mutex_unlock(&local->iflist_mtx);
482 
483         synchronize_net();
484 
485         mutex_lock(&local->mtx);
486         ieee80211_vif_release_channel(sdata);
487         mutex_unlock(&local->mtx);
488 
489         drv_remove_interface(local, sdata);
490 
491         kfree(sdata);
492 }
493 
494 /*
495  * NOTE: Be very careful when changing this function, it must NOT return
496  * an error on interface type changes that have been pre-checked, so most
497  * checks should be in ieee80211_check_concurrent_iface.
498  */
499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
500 {
501         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
502         struct net_device *dev = wdev->netdev;
503         struct ieee80211_local *local = sdata->local;
504         struct sta_info *sta;
505         u32 changed = 0;
506         int res;
507         u32 hw_reconf_flags = 0;
508 
509         switch (sdata->vif.type) {
510         case NL80211_IFTYPE_WDS:
511                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
512                         return -ENOLINK;
513                 break;
514         case NL80211_IFTYPE_AP_VLAN: {
515                 struct ieee80211_sub_if_data *master;
516 
517                 if (!sdata->bss)
518                         return -ENOLINK;
519 
520                 mutex_lock(&local->mtx);
521                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
522                 mutex_unlock(&local->mtx);
523 
524                 master = container_of(sdata->bss,
525                                       struct ieee80211_sub_if_data, u.ap);
526                 sdata->control_port_protocol =
527                         master->control_port_protocol;
528                 sdata->control_port_no_encrypt =
529                         master->control_port_no_encrypt;
530                 sdata->vif.cab_queue = master->vif.cab_queue;
531                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
532                        sizeof(sdata->vif.hw_queue));
533                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
534 
535                 mutex_lock(&local->key_mtx);
536                 sdata->crypto_tx_tailroom_needed_cnt +=
537                         master->crypto_tx_tailroom_needed_cnt;
538                 mutex_unlock(&local->key_mtx);
539 
540                 break;
541                 }
542         case NL80211_IFTYPE_AP:
543                 sdata->bss = &sdata->u.ap;
544                 break;
545         case NL80211_IFTYPE_MESH_POINT:
546         case NL80211_IFTYPE_STATION:
547         case NL80211_IFTYPE_MONITOR:
548         case NL80211_IFTYPE_ADHOC:
549         case NL80211_IFTYPE_P2P_DEVICE:
550         case NL80211_IFTYPE_OCB:
551         case NL80211_IFTYPE_NAN:
552                 /* no special treatment */
553                 break;
554         case NL80211_IFTYPE_UNSPECIFIED:
555         case NUM_NL80211_IFTYPES:
556         case NL80211_IFTYPE_P2P_CLIENT:
557         case NL80211_IFTYPE_P2P_GO:
558                 /* cannot happen */
559                 WARN_ON(1);
560                 break;
561         }
562 
563         if (local->open_count == 0) {
564                 res = drv_start(local);
565                 if (res)
566                         goto err_del_bss;
567                 /* we're brought up, everything changes */
568                 hw_reconf_flags = ~0;
569                 ieee80211_led_radio(local, true);
570                 ieee80211_mod_tpt_led_trig(local,
571                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
572         }
573 
574         /*
575          * Copy the hopefully now-present MAC address to
576          * this interface, if it has the special null one.
577          */
578         if (dev && is_zero_ether_addr(dev->dev_addr)) {
579                 memcpy(dev->dev_addr,
580                        local->hw.wiphy->perm_addr,
581                        ETH_ALEN);
582                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
583 
584                 if (!is_valid_ether_addr(dev->dev_addr)) {
585                         res = -EADDRNOTAVAIL;
586                         goto err_stop;
587                 }
588         }
589 
590         switch (sdata->vif.type) {
591         case NL80211_IFTYPE_AP_VLAN:
592                 /* no need to tell driver, but set carrier and chanctx */
593                 if (rtnl_dereference(sdata->bss->beacon)) {
594                         ieee80211_vif_vlan_copy_chanctx(sdata);
595                         netif_carrier_on(dev);
596                 } else {
597                         netif_carrier_off(dev);
598                 }
599                 break;
600         case NL80211_IFTYPE_MONITOR:
601                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
602                         local->cooked_mntrs++;
603                         break;
604                 }
605 
606                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
607                         res = drv_add_interface(local, sdata);
608                         if (res)
609                                 goto err_stop;
610                 } else if (local->monitors == 0 && local->open_count == 0) {
611                         res = ieee80211_add_virtual_monitor(local);
612                         if (res)
613                                 goto err_stop;
614                 }
615 
616                 /* must be before the call to ieee80211_configure_filter */
617                 local->monitors++;
618                 if (local->monitors == 1) {
619                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
620                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
621                 }
622 
623                 ieee80211_adjust_monitor_flags(sdata, 1);
624                 ieee80211_configure_filter(local);
625                 mutex_lock(&local->mtx);
626                 ieee80211_recalc_idle(local);
627                 mutex_unlock(&local->mtx);
628 
629                 netif_carrier_on(dev);
630                 break;
631         default:
632                 if (coming_up) {
633                         ieee80211_del_virtual_monitor(local);
634 
635                         res = drv_add_interface(local, sdata);
636                         if (res)
637                                 goto err_stop;
638                         res = ieee80211_check_queues(sdata,
639                                 ieee80211_vif_type_p2p(&sdata->vif));
640                         if (res)
641                                 goto err_del_interface;
642                 }
643 
644                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
645                         local->fif_pspoll++;
646                         local->fif_probe_req++;
647 
648                         ieee80211_configure_filter(local);
649                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
650                         local->fif_probe_req++;
651                 }
652 
653                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
654                     sdata->vif.type != NL80211_IFTYPE_NAN)
655                         changed |= ieee80211_reset_erp_info(sdata);
656                 ieee80211_bss_info_change_notify(sdata, changed);
657 
658                 switch (sdata->vif.type) {
659                 case NL80211_IFTYPE_STATION:
660                 case NL80211_IFTYPE_ADHOC:
661                 case NL80211_IFTYPE_AP:
662                 case NL80211_IFTYPE_MESH_POINT:
663                 case NL80211_IFTYPE_OCB:
664                         netif_carrier_off(dev);
665                         break;
666                 case NL80211_IFTYPE_WDS:
667                 case NL80211_IFTYPE_P2P_DEVICE:
668                 case NL80211_IFTYPE_NAN:
669                         break;
670                 default:
671                         /* not reached */
672                         WARN_ON(1);
673                 }
674 
675                 /*
676                  * Set default queue parameters so drivers don't
677                  * need to initialise the hardware if the hardware
678                  * doesn't start up with sane defaults.
679                  * Enable QoS for anything but station interfaces.
680                  */
681                 ieee80211_set_wmm_default(sdata, true,
682                         sdata->vif.type != NL80211_IFTYPE_STATION);
683         }
684 
685         set_bit(SDATA_STATE_RUNNING, &sdata->state);
686 
687         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
688                 /* Create STA entry for the WDS peer */
689                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
690                                      GFP_KERNEL);
691                 if (!sta) {
692                         res = -ENOMEM;
693                         goto err_del_interface;
694                 }
695 
696                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
697                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
698                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
699 
700                 res = sta_info_insert(sta);
701                 if (res) {
702                         /* STA has been freed */
703                         goto err_del_interface;
704                 }
705 
706                 rate_control_rate_init(sta);
707                 netif_carrier_on(dev);
708         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
709                 rcu_assign_pointer(local->p2p_sdata, sdata);
710         }
711 
712         /*
713          * set_multicast_list will be invoked by the networking core
714          * which will check whether any increments here were done in
715          * error and sync them down to the hardware as filter flags.
716          */
717         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
718                 atomic_inc(&local->iff_allmultis);
719 
720         if (coming_up)
721                 local->open_count++;
722 
723         if (hw_reconf_flags)
724                 ieee80211_hw_config(local, hw_reconf_flags);
725 
726         ieee80211_recalc_ps(local);
727 
728         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
729             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
730                 /* XXX: for AP_VLAN, actually track AP queues */
731                 netif_tx_start_all_queues(dev);
732         } else if (dev) {
733                 unsigned long flags;
734                 int n_acs = IEEE80211_NUM_ACS;
735                 int ac;
736 
737                 if (local->hw.queues < IEEE80211_NUM_ACS)
738                         n_acs = 1;
739 
740                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
741                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
742                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
743                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
744                         for (ac = 0; ac < n_acs; ac++) {
745                                 int ac_queue = sdata->vif.hw_queue[ac];
746 
747                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
748                                     skb_queue_empty(&local->pending[ac_queue]))
749                                         netif_start_subqueue(dev, ac);
750                         }
751                 }
752                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
753         }
754 
755         return 0;
756  err_del_interface:
757         drv_remove_interface(local, sdata);
758  err_stop:
759         if (!local->open_count)
760                 drv_stop(local);
761  err_del_bss:
762         sdata->bss = NULL;
763         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
764                 mutex_lock(&local->mtx);
765                 list_del(&sdata->u.vlan.list);
766                 mutex_unlock(&local->mtx);
767         }
768         /* might already be clear but that doesn't matter */
769         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
770         return res;
771 }
772 
773 static int ieee80211_open(struct net_device *dev)
774 {
775         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
776         int err;
777 
778         /* fail early if user set an invalid address */
779         if (!is_valid_ether_addr(dev->dev_addr))
780                 return -EADDRNOTAVAIL;
781 
782         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
783         if (err)
784                 return err;
785 
786         return ieee80211_do_open(&sdata->wdev, true);
787 }
788 
789 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
790                               bool going_down)
791 {
792         struct ieee80211_local *local = sdata->local;
793         struct fq *fq = &local->fq;
794         unsigned long flags;
795         struct sk_buff *skb, *tmp;
796         u32 hw_reconf_flags = 0;
797         int i, flushed;
798         struct ps_data *ps;
799         struct cfg80211_chan_def chandef;
800         bool cancel_scan;
801         struct cfg80211_nan_func *func;
802 
803         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
804 
805         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
806         if (cancel_scan)
807                 ieee80211_scan_cancel(local);
808 
809         /*
810          * Stop TX on this interface first.
811          */
812         if (sdata->dev)
813                 netif_tx_stop_all_queues(sdata->dev);
814 
815         ieee80211_roc_purge(local, sdata);
816 
817         switch (sdata->vif.type) {
818         case NL80211_IFTYPE_STATION:
819                 ieee80211_mgd_stop(sdata);
820                 break;
821         case NL80211_IFTYPE_ADHOC:
822                 ieee80211_ibss_stop(sdata);
823                 break;
824         case NL80211_IFTYPE_AP:
825                 cancel_work_sync(&sdata->u.ap.request_smps_work);
826                 break;
827         default:
828                 break;
829         }
830 
831         /*
832          * Remove all stations associated with this interface.
833          *
834          * This must be done before calling ops->remove_interface()
835          * because otherwise we can later invoke ops->sta_notify()
836          * whenever the STAs are removed, and that invalidates driver
837          * assumptions about always getting a vif pointer that is valid
838          * (because if we remove a STA after ops->remove_interface()
839          * the driver will have removed the vif info already!)
840          *
841          * In WDS mode a station must exist here and be flushed, for
842          * AP_VLANs stations may exist since there's nothing else that
843          * would have removed them, but in other modes there shouldn't
844          * be any stations.
845          */
846         flushed = sta_info_flush(sdata);
847         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
848                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
849                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
850 
851         /* don't count this interface for allmulti while it is down */
852         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
853                 atomic_dec(&local->iff_allmultis);
854 
855         if (sdata->vif.type == NL80211_IFTYPE_AP) {
856                 local->fif_pspoll--;
857                 local->fif_probe_req--;
858         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
859                 local->fif_probe_req--;
860         }
861 
862         if (sdata->dev) {
863                 netif_addr_lock_bh(sdata->dev);
864                 spin_lock_bh(&local->filter_lock);
865                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
866                                  sdata->dev->addr_len);
867                 spin_unlock_bh(&local->filter_lock);
868                 netif_addr_unlock_bh(sdata->dev);
869         }
870 
871         del_timer_sync(&local->dynamic_ps_timer);
872         cancel_work_sync(&local->dynamic_ps_enable_work);
873 
874         cancel_work_sync(&sdata->recalc_smps);
875         sdata_lock(sdata);
876         mutex_lock(&local->mtx);
877         sdata->vif.csa_active = false;
878         if (sdata->vif.type == NL80211_IFTYPE_STATION)
879                 sdata->u.mgd.csa_waiting_bcn = false;
880         if (sdata->csa_block_tx) {
881                 ieee80211_wake_vif_queues(local, sdata,
882                                           IEEE80211_QUEUE_STOP_REASON_CSA);
883                 sdata->csa_block_tx = false;
884         }
885         mutex_unlock(&local->mtx);
886         sdata_unlock(sdata);
887 
888         cancel_work_sync(&sdata->csa_finalize_work);
889 
890         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
891 
892         if (sdata->wdev.cac_started) {
893                 chandef = sdata->vif.bss_conf.chandef;
894                 WARN_ON(local->suspended);
895                 mutex_lock(&local->mtx);
896                 ieee80211_vif_release_channel(sdata);
897                 mutex_unlock(&local->mtx);
898                 cfg80211_cac_event(sdata->dev, &chandef,
899                                    NL80211_RADAR_CAC_ABORTED,
900                                    GFP_KERNEL);
901         }
902 
903         /* APs need special treatment */
904         if (sdata->vif.type == NL80211_IFTYPE_AP) {
905                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
906 
907                 /* down all dependent devices, that is VLANs */
908                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
909                                          u.vlan.list)
910                         dev_close(vlan->dev);
911                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
912         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
913                 /* remove all packets in parent bc_buf pointing to this dev */
914                 ps = &sdata->bss->ps;
915 
916                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
917                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
918                         if (skb->dev == sdata->dev) {
919                                 __skb_unlink(skb, &ps->bc_buf);
920                                 local->total_ps_buffered--;
921                                 ieee80211_free_txskb(&local->hw, skb);
922                         }
923                 }
924                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
925         }
926 
927         if (going_down)
928                 local->open_count--;
929 
930         switch (sdata->vif.type) {
931         case NL80211_IFTYPE_AP_VLAN:
932                 mutex_lock(&local->mtx);
933                 list_del(&sdata->u.vlan.list);
934                 mutex_unlock(&local->mtx);
935                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
936                 /* see comment in the default case below */
937                 ieee80211_free_keys(sdata, true);
938                 /* no need to tell driver */
939                 break;
940         case NL80211_IFTYPE_MONITOR:
941                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
942                         local->cooked_mntrs--;
943                         break;
944                 }
945 
946                 local->monitors--;
947                 if (local->monitors == 0) {
948                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
949                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
950                 }
951 
952                 ieee80211_adjust_monitor_flags(sdata, -1);
953                 break;
954         case NL80211_IFTYPE_NAN:
955                 /* clean all the functions */
956                 spin_lock_bh(&sdata->u.nan.func_lock);
957 
958                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
959                         idr_remove(&sdata->u.nan.function_inst_ids, i);
960                         cfg80211_free_nan_func(func);
961                 }
962                 idr_destroy(&sdata->u.nan.function_inst_ids);
963 
964                 spin_unlock_bh(&sdata->u.nan.func_lock);
965                 break;
966         case NL80211_IFTYPE_P2P_DEVICE:
967                 /* relies on synchronize_rcu() below */
968                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
969                 /* fall through */
970         default:
971                 cancel_work_sync(&sdata->work);
972                 /*
973                  * When we get here, the interface is marked down.
974                  * Free the remaining keys, if there are any
975                  * (which can happen in AP mode if userspace sets
976                  * keys before the interface is operating, and maybe
977                  * also in WDS mode)
978                  *
979                  * Force the key freeing to always synchronize_net()
980                  * to wait for the RX path in case it is using this
981                  * interface enqueuing frames at this very time on
982                  * another CPU.
983                  */
984                 ieee80211_free_keys(sdata, true);
985                 skb_queue_purge(&sdata->skb_queue);
986         }
987 
988         sdata->bss = NULL;
989 
990         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
991         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
992                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
993                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
994                         if (info->control.vif == &sdata->vif) {
995                                 __skb_unlink(skb, &local->pending[i]);
996                                 ieee80211_free_txskb(&local->hw, skb);
997                         }
998                 }
999         }
1000         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1001 
1002         if (sdata->vif.txq) {
1003                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
1004 
1005                 spin_lock_bh(&fq->lock);
1006                 ieee80211_txq_purge(local, txqi);
1007                 spin_unlock_bh(&fq->lock);
1008         }
1009 
1010         if (local->open_count == 0)
1011                 ieee80211_clear_tx_pending(local);
1012 
1013         /*
1014          * If the interface goes down while suspended, presumably because
1015          * the device was unplugged and that happens before our resume,
1016          * then the driver is already unconfigured and the remainder of
1017          * this function isn't needed.
1018          * XXX: what about WoWLAN? If the device has software state, e.g.
1019          *      memory allocated, it might expect teardown commands from
1020          *      mac80211 here?
1021          */
1022         if (local->suspended) {
1023                 WARN_ON(local->wowlan);
1024                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1025                 return;
1026         }
1027 
1028         switch (sdata->vif.type) {
1029         case NL80211_IFTYPE_AP_VLAN:
1030                 break;
1031         case NL80211_IFTYPE_MONITOR:
1032                 if (local->monitors == 0)
1033                         ieee80211_del_virtual_monitor(local);
1034 
1035                 mutex_lock(&local->mtx);
1036                 ieee80211_recalc_idle(local);
1037                 mutex_unlock(&local->mtx);
1038 
1039                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1040                         break;
1041 
1042                 /* fall through */
1043         default:
1044                 if (going_down)
1045                         drv_remove_interface(local, sdata);
1046         }
1047 
1048         ieee80211_recalc_ps(local);
1049 
1050         if (cancel_scan)
1051                 flush_delayed_work(&local->scan_work);
1052 
1053         if (local->open_count == 0) {
1054                 ieee80211_stop_device(local);
1055 
1056                 /* no reconfiguring after stop! */
1057                 return;
1058         }
1059 
1060         /* do after stop to avoid reconfiguring when we stop anyway */
1061         ieee80211_configure_filter(local);
1062         ieee80211_hw_config(local, hw_reconf_flags);
1063 
1064         if (local->monitors == local->open_count)
1065                 ieee80211_add_virtual_monitor(local);
1066 }
1067 
1068 static int ieee80211_stop(struct net_device *dev)
1069 {
1070         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071 
1072         ieee80211_do_stop(sdata, true);
1073 
1074         return 0;
1075 }
1076 
1077 static void ieee80211_set_multicast_list(struct net_device *dev)
1078 {
1079         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080         struct ieee80211_local *local = sdata->local;
1081         int allmulti, sdata_allmulti;
1082 
1083         allmulti = !!(dev->flags & IFF_ALLMULTI);
1084         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1085 
1086         if (allmulti != sdata_allmulti) {
1087                 if (dev->flags & IFF_ALLMULTI)
1088                         atomic_inc(&local->iff_allmultis);
1089                 else
1090                         atomic_dec(&local->iff_allmultis);
1091                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1092         }
1093 
1094         spin_lock_bh(&local->filter_lock);
1095         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1096         spin_unlock_bh(&local->filter_lock);
1097         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1098 }
1099 
1100 /*
1101  * Called when the netdev is removed or, by the code below, before
1102  * the interface type changes.
1103  */
1104 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1105 {
1106         int i;
1107 
1108         /* free extra data */
1109         ieee80211_free_keys(sdata, false);
1110 
1111         ieee80211_debugfs_remove_netdev(sdata);
1112 
1113         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1114                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1115         sdata->fragment_next = 0;
1116 
1117         if (ieee80211_vif_is_mesh(&sdata->vif))
1118                 ieee80211_mesh_teardown_sdata(sdata);
1119 }
1120 
1121 static void ieee80211_uninit(struct net_device *dev)
1122 {
1123         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1124 }
1125 
1126 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1127                                          struct sk_buff *skb,
1128                                          void *accel_priv,
1129                                          select_queue_fallback_t fallback)
1130 {
1131         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1132 }
1133 
1134 static struct rtnl_link_stats64 *
1135 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1136 {
1137         int i;
1138 
1139         for_each_possible_cpu(i) {
1140                 const struct pcpu_sw_netstats *tstats;
1141                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1142                 unsigned int start;
1143 
1144                 tstats = per_cpu_ptr(dev->tstats, i);
1145 
1146                 do {
1147                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1148                         rx_packets = tstats->rx_packets;
1149                         tx_packets = tstats->tx_packets;
1150                         rx_bytes = tstats->rx_bytes;
1151                         tx_bytes = tstats->tx_bytes;
1152                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1153 
1154                 stats->rx_packets += rx_packets;
1155                 stats->tx_packets += tx_packets;
1156                 stats->rx_bytes   += rx_bytes;
1157                 stats->tx_bytes   += tx_bytes;
1158         }
1159 
1160         return stats;
1161 }
1162 
1163 static const struct net_device_ops ieee80211_dataif_ops = {
1164         .ndo_open               = ieee80211_open,
1165         .ndo_stop               = ieee80211_stop,
1166         .ndo_uninit             = ieee80211_uninit,
1167         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1168         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1169         .ndo_change_mtu         = ieee80211_change_mtu,
1170         .ndo_set_mac_address    = ieee80211_change_mac,
1171         .ndo_select_queue       = ieee80211_netdev_select_queue,
1172         .ndo_get_stats64        = ieee80211_get_stats64,
1173 };
1174 
1175 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1176                                           struct sk_buff *skb,
1177                                           void *accel_priv,
1178                                           select_queue_fallback_t fallback)
1179 {
1180         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181         struct ieee80211_local *local = sdata->local;
1182         struct ieee80211_hdr *hdr;
1183         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1184 
1185         if (local->hw.queues < IEEE80211_NUM_ACS)
1186                 return 0;
1187 
1188         if (skb->len < 4 ||
1189             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1190                 return 0; /* doesn't matter, frame will be dropped */
1191 
1192         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1193 
1194         return ieee80211_select_queue_80211(sdata, skb, hdr);
1195 }
1196 
1197 static const struct net_device_ops ieee80211_monitorif_ops = {
1198         .ndo_open               = ieee80211_open,
1199         .ndo_stop               = ieee80211_stop,
1200         .ndo_uninit             = ieee80211_uninit,
1201         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1202         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1203         .ndo_change_mtu         = ieee80211_change_mtu,
1204         .ndo_set_mac_address    = ieee80211_change_mac,
1205         .ndo_select_queue       = ieee80211_monitor_select_queue,
1206         .ndo_get_stats64        = ieee80211_get_stats64,
1207 };
1208 
1209 static void ieee80211_if_free(struct net_device *dev)
1210 {
1211         free_percpu(dev->tstats);
1212         free_netdev(dev);
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->destructor = ieee80211_if_free;
1221 }
1222 
1223 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1224 {
1225         ieee80211_if_setup(dev);
1226         dev->priv_flags |= IFF_NO_QUEUE;
1227 }
1228 
1229 static void ieee80211_iface_work(struct work_struct *work)
1230 {
1231         struct ieee80211_sub_if_data *sdata =
1232                 container_of(work, struct ieee80211_sub_if_data, work);
1233         struct ieee80211_local *local = sdata->local;
1234         struct sk_buff *skb;
1235         struct sta_info *sta;
1236         struct ieee80211_ra_tid *ra_tid;
1237         struct ieee80211_rx_agg *rx_agg;
1238 
1239         if (!ieee80211_sdata_running(sdata))
1240                 return;
1241 
1242         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1243                 return;
1244 
1245         if (!ieee80211_can_run_worker(local))
1246                 return;
1247 
1248         /* first process frames */
1249         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1250                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1251 
1252                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1253                         ra_tid = (void *)&skb->cb;
1254                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1255                                                  ra_tid->tid);
1256                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1257                         ra_tid = (void *)&skb->cb;
1258                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1259                                                 ra_tid->tid);
1260                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1261                         rx_agg = (void *)&skb->cb;
1262                         mutex_lock(&local->sta_mtx);
1263                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1264                         if (sta)
1265                                 __ieee80211_start_rx_ba_session(sta,
1266                                                 0, 0, 0, 1, rx_agg->tid,
1267                                                 IEEE80211_MAX_AMPDU_BUF,
1268                                                 false, true);
1269                         mutex_unlock(&local->sta_mtx);
1270                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1271                         rx_agg = (void *)&skb->cb;
1272                         mutex_lock(&local->sta_mtx);
1273                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1274                         if (sta)
1275                                 __ieee80211_stop_rx_ba_session(sta,
1276                                                         rx_agg->tid,
1277                                                         WLAN_BACK_RECIPIENT, 0,
1278                                                         false);
1279                         mutex_unlock(&local->sta_mtx);
1280                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1281                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1282                         int len = skb->len;
1283 
1284                         mutex_lock(&local->sta_mtx);
1285                         sta = sta_info_get_bss(sdata, mgmt->sa);
1286                         if (sta) {
1287                                 switch (mgmt->u.action.u.addba_req.action_code) {
1288                                 case WLAN_ACTION_ADDBA_REQ:
1289                                         ieee80211_process_addba_request(
1290                                                         local, sta, mgmt, len);
1291                                         break;
1292                                 case WLAN_ACTION_ADDBA_RESP:
1293                                         ieee80211_process_addba_resp(local, sta,
1294                                                                      mgmt, len);
1295                                         break;
1296                                 case WLAN_ACTION_DELBA:
1297                                         ieee80211_process_delba(sdata, sta,
1298                                                                 mgmt, len);
1299                                         break;
1300                                 default:
1301                                         WARN_ON(1);
1302                                         break;
1303                                 }
1304                         }
1305                         mutex_unlock(&local->sta_mtx);
1306                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1307                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1308                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1309                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1310                                 ieee80211_process_mu_groups(sdata, mgmt);
1311                                 break;
1312                         default:
1313                                 WARN_ON(1);
1314                                 break;
1315                         }
1316                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1317                         struct ieee80211_hdr *hdr = (void *)mgmt;
1318                         /*
1319                          * So the frame isn't mgmt, but frame_control
1320                          * is at the right place anyway, of course, so
1321                          * the if statement is correct.
1322                          *
1323                          * Warn if we have other data frame types here,
1324                          * they must not get here.
1325                          */
1326                         WARN_ON(hdr->frame_control &
1327                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1328                         WARN_ON(!(hdr->seq_ctrl &
1329                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1330                         /*
1331                          * This was a fragment of a frame, received while
1332                          * a block-ack session was active. That cannot be
1333                          * right, so terminate the session.
1334                          */
1335                         mutex_lock(&local->sta_mtx);
1336                         sta = sta_info_get_bss(sdata, mgmt->sa);
1337                         if (sta) {
1338                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1339                                                 IEEE80211_QOS_CTL_TID_MASK;
1340 
1341                                 __ieee80211_stop_rx_ba_session(
1342                                         sta, tid, WLAN_BACK_RECIPIENT,
1343                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1344                                         true);
1345                         }
1346                         mutex_unlock(&local->sta_mtx);
1347                 } else switch (sdata->vif.type) {
1348                 case NL80211_IFTYPE_STATION:
1349                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1350                         break;
1351                 case NL80211_IFTYPE_ADHOC:
1352                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1353                         break;
1354                 case NL80211_IFTYPE_MESH_POINT:
1355                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1356                                 break;
1357                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1358                         break;
1359                 default:
1360                         WARN(1, "frame for unexpected interface type");
1361                         break;
1362                 }
1363 
1364                 kfree_skb(skb);
1365         }
1366 
1367         /* then other type-dependent work */
1368         switch (sdata->vif.type) {
1369         case NL80211_IFTYPE_STATION:
1370                 ieee80211_sta_work(sdata);
1371                 break;
1372         case NL80211_IFTYPE_ADHOC:
1373                 ieee80211_ibss_work(sdata);
1374                 break;
1375         case NL80211_IFTYPE_MESH_POINT:
1376                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1377                         break;
1378                 ieee80211_mesh_work(sdata);
1379                 break;
1380         case NL80211_IFTYPE_OCB:
1381                 ieee80211_ocb_work(sdata);
1382                 break;
1383         default:
1384                 break;
1385         }
1386 }
1387 
1388 static void ieee80211_recalc_smps_work(struct work_struct *work)
1389 {
1390         struct ieee80211_sub_if_data *sdata =
1391                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1392 
1393         ieee80211_recalc_smps(sdata);
1394 }
1395 
1396 /*
1397  * Helper function to initialise an interface to a specific type.
1398  */
1399 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1400                                   enum nl80211_iftype type)
1401 {
1402         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1403                                                     0xff, 0xff, 0xff};
1404 
1405         /* clear type-dependent union */
1406         memset(&sdata->u, 0, sizeof(sdata->u));
1407 
1408         /* and set some type-dependent values */
1409         sdata->vif.type = type;
1410         sdata->vif.p2p = false;
1411         sdata->wdev.iftype = type;
1412 
1413         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1414         sdata->control_port_no_encrypt = false;
1415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1416         sdata->vif.bss_conf.idle = true;
1417 
1418         sdata->noack_map = 0;
1419 
1420         /* only monitor/p2p-device differ */
1421         if (sdata->dev) {
1422                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1423                 sdata->dev->type = ARPHRD_ETHER;
1424         }
1425 
1426         skb_queue_head_init(&sdata->skb_queue);
1427         INIT_WORK(&sdata->work, ieee80211_iface_work);
1428         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1429         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1430         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1431         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1432 
1433         switch (type) {
1434         case NL80211_IFTYPE_P2P_GO:
1435                 type = NL80211_IFTYPE_AP;
1436                 sdata->vif.type = type;
1437                 sdata->vif.p2p = true;
1438                 /* fall through */
1439         case NL80211_IFTYPE_AP:
1440                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1441                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1442                 INIT_WORK(&sdata->u.ap.request_smps_work,
1443                           ieee80211_request_smps_ap_work);
1444                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1445                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1446                 break;
1447         case NL80211_IFTYPE_P2P_CLIENT:
1448                 type = NL80211_IFTYPE_STATION;
1449                 sdata->vif.type = type;
1450                 sdata->vif.p2p = true;
1451                 /* fall through */
1452         case NL80211_IFTYPE_STATION:
1453                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1454                 ieee80211_sta_setup_sdata(sdata);
1455                 break;
1456         case NL80211_IFTYPE_OCB:
1457                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1458                 ieee80211_ocb_setup_sdata(sdata);
1459                 break;
1460         case NL80211_IFTYPE_ADHOC:
1461                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1462                 ieee80211_ibss_setup_sdata(sdata);
1463                 break;
1464         case NL80211_IFTYPE_MESH_POINT:
1465                 if (ieee80211_vif_is_mesh(&sdata->vif))
1466                         ieee80211_mesh_init_sdata(sdata);
1467                 break;
1468         case NL80211_IFTYPE_MONITOR:
1469                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1470                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1471                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1472                                       MONITOR_FLAG_OTHER_BSS;
1473                 break;
1474         case NL80211_IFTYPE_WDS:
1475                 sdata->vif.bss_conf.bssid = NULL;
1476                 break;
1477         case NL80211_IFTYPE_NAN:
1478                 idr_init(&sdata->u.nan.function_inst_ids);
1479                 spin_lock_init(&sdata->u.nan.func_lock);
1480                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1481                 break;
1482         case NL80211_IFTYPE_AP_VLAN:
1483         case NL80211_IFTYPE_P2P_DEVICE:
1484                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1485                 break;
1486         case NL80211_IFTYPE_UNSPECIFIED:
1487         case NUM_NL80211_IFTYPES:
1488                 BUG();
1489                 break;
1490         }
1491 
1492         ieee80211_debugfs_add_netdev(sdata);
1493 }
1494 
1495 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1496                                            enum nl80211_iftype type)
1497 {
1498         struct ieee80211_local *local = sdata->local;
1499         int ret, err;
1500         enum nl80211_iftype internal_type = type;
1501         bool p2p = false;
1502 
1503         ASSERT_RTNL();
1504 
1505         if (!local->ops->change_interface)
1506                 return -EBUSY;
1507 
1508         switch (sdata->vif.type) {
1509         case NL80211_IFTYPE_AP:
1510         case NL80211_IFTYPE_STATION:
1511         case NL80211_IFTYPE_ADHOC:
1512         case NL80211_IFTYPE_OCB:
1513                 /*
1514                  * Could maybe also all others here?
1515                  * Just not sure how that interacts
1516                  * with the RX/config path e.g. for
1517                  * mesh.
1518                  */
1519                 break;
1520         default:
1521                 return -EBUSY;
1522         }
1523 
1524         switch (type) {
1525         case NL80211_IFTYPE_AP:
1526         case NL80211_IFTYPE_STATION:
1527         case NL80211_IFTYPE_ADHOC:
1528         case NL80211_IFTYPE_OCB:
1529                 /*
1530                  * Could probably support everything
1531                  * but WDS here (WDS do_open can fail
1532                  * under memory pressure, which this
1533                  * code isn't prepared to handle).
1534                  */
1535                 break;
1536         case NL80211_IFTYPE_P2P_CLIENT:
1537                 p2p = true;
1538                 internal_type = NL80211_IFTYPE_STATION;
1539                 break;
1540         case NL80211_IFTYPE_P2P_GO:
1541                 p2p = true;
1542                 internal_type = NL80211_IFTYPE_AP;
1543                 break;
1544         default:
1545                 return -EBUSY;
1546         }
1547 
1548         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1549         if (ret)
1550                 return ret;
1551 
1552         ieee80211_do_stop(sdata, false);
1553 
1554         ieee80211_teardown_sdata(sdata);
1555 
1556         ret = drv_change_interface(local, sdata, internal_type, p2p);
1557         if (ret)
1558                 type = ieee80211_vif_type_p2p(&sdata->vif);
1559 
1560         /*
1561          * Ignore return value here, there's not much we can do since
1562          * the driver changed the interface type internally already.
1563          * The warnings will hopefully make driver authors fix it :-)
1564          */
1565         ieee80211_check_queues(sdata, type);
1566 
1567         ieee80211_setup_sdata(sdata, type);
1568 
1569         err = ieee80211_do_open(&sdata->wdev, false);
1570         WARN(err, "type change: do_open returned %d", err);
1571 
1572         return ret;
1573 }
1574 
1575 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1576                              enum nl80211_iftype type)
1577 {
1578         int ret;
1579 
1580         ASSERT_RTNL();
1581 
1582         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1583                 return 0;
1584 
1585         if (ieee80211_sdata_running(sdata)) {
1586                 ret = ieee80211_runtime_change_iftype(sdata, type);
1587                 if (ret)
1588                         return ret;
1589         } else {
1590                 /* Purge and reset type-dependent state. */
1591                 ieee80211_teardown_sdata(sdata);
1592                 ieee80211_setup_sdata(sdata, type);
1593         }
1594 
1595         /* reset some values that shouldn't be kept across type changes */
1596         if (type == NL80211_IFTYPE_STATION)
1597                 sdata->u.mgd.use_4addr = false;
1598 
1599         return 0;
1600 }
1601 
1602 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1603                                        u8 *perm_addr, enum nl80211_iftype type)
1604 {
1605         struct ieee80211_sub_if_data *sdata;
1606         u64 mask, start, addr, val, inc;
1607         u8 *m;
1608         u8 tmp_addr[ETH_ALEN];
1609         int i;
1610 
1611         /* default ... something at least */
1612         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1613 
1614         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1615             local->hw.wiphy->n_addresses <= 1)
1616                 return;
1617 
1618         mutex_lock(&local->iflist_mtx);
1619 
1620         switch (type) {
1621         case NL80211_IFTYPE_MONITOR:
1622                 /* doesn't matter */
1623                 break;
1624         case NL80211_IFTYPE_WDS:
1625         case NL80211_IFTYPE_AP_VLAN:
1626                 /* match up with an AP interface */
1627                 list_for_each_entry(sdata, &local->interfaces, list) {
1628                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1629                                 continue;
1630                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1631                         break;
1632                 }
1633                 /* keep default if no AP interface present */
1634                 break;
1635         case NL80211_IFTYPE_P2P_CLIENT:
1636         case NL80211_IFTYPE_P2P_GO:
1637                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1638                         list_for_each_entry(sdata, &local->interfaces, list) {
1639                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1640                                         continue;
1641                                 if (!ieee80211_sdata_running(sdata))
1642                                         continue;
1643                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1644                                 goto out_unlock;
1645                         }
1646                 }
1647                 /* otherwise fall through */
1648         default:
1649                 /* assign a new address if possible -- try n_addresses first */
1650                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1651                         bool used = false;
1652 
1653                         list_for_each_entry(sdata, &local->interfaces, list) {
1654                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1655                                                      sdata->vif.addr)) {
1656                                         used = true;
1657                                         break;
1658                                 }
1659                         }
1660 
1661                         if (!used) {
1662                                 memcpy(perm_addr,
1663                                        local->hw.wiphy->addresses[i].addr,
1664                                        ETH_ALEN);
1665                                 break;
1666                         }
1667                 }
1668 
1669                 /* try mask if available */
1670                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1671                         break;
1672 
1673                 m = local->hw.wiphy->addr_mask;
1674                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1675                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1676                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1677 
1678                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1679                         /* not a contiguous mask ... not handled now! */
1680                         pr_info("not contiguous\n");
1681                         break;
1682                 }
1683 
1684                 /*
1685                  * Pick address of existing interface in case user changed
1686                  * MAC address manually, default to perm_addr.
1687                  */
1688                 m = local->hw.wiphy->perm_addr;
1689                 list_for_each_entry(sdata, &local->interfaces, list) {
1690                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1691                                 continue;
1692                         m = sdata->vif.addr;
1693                         break;
1694                 }
1695                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1696                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1697                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1698 
1699                 inc = 1ULL<<__ffs64(mask);
1700                 val = (start & mask);
1701                 addr = (start & ~mask) | (val & mask);
1702                 do {
1703                         bool used = false;
1704 
1705                         tmp_addr[5] = addr >> 0*8;
1706                         tmp_addr[4] = addr >> 1*8;
1707                         tmp_addr[3] = addr >> 2*8;
1708                         tmp_addr[2] = addr >> 3*8;
1709                         tmp_addr[1] = addr >> 4*8;
1710                         tmp_addr[0] = addr >> 5*8;
1711 
1712                         val += inc;
1713 
1714                         list_for_each_entry(sdata, &local->interfaces, list) {
1715                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1716                                         used = true;
1717                                         break;
1718                                 }
1719                         }
1720 
1721                         if (!used) {
1722                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1723                                 break;
1724                         }
1725                         addr = (start & ~mask) | (val & mask);
1726                 } while (addr != start);
1727 
1728                 break;
1729         }
1730 
1731  out_unlock:
1732         mutex_unlock(&local->iflist_mtx);
1733 }
1734 
1735 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1736                      unsigned char name_assign_type,
1737                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1738                      struct vif_params *params)
1739 {
1740         struct net_device *ndev = NULL;
1741         struct ieee80211_sub_if_data *sdata = NULL;
1742         struct txq_info *txqi;
1743         void (*if_setup)(struct net_device *dev);
1744         int ret, i;
1745         int txqs = 1;
1746 
1747         ASSERT_RTNL();
1748 
1749         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1750                 struct wireless_dev *wdev;
1751 
1752                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1753                                 GFP_KERNEL);
1754                 if (!sdata)
1755                         return -ENOMEM;
1756                 wdev = &sdata->wdev;
1757 
1758                 sdata->dev = NULL;
1759                 strlcpy(sdata->name, name, IFNAMSIZ);
1760                 ieee80211_assign_perm_addr(local, wdev->address, type);
1761                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1762         } else {
1763                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1764                                  sizeof(void *));
1765                 int txq_size = 0;
1766 
1767                 if (local->ops->wake_tx_queue)
1768                         txq_size += sizeof(struct txq_info) +
1769                                     local->hw.txq_data_size;
1770 
1771                 if (local->ops->wake_tx_queue)
1772                         if_setup = ieee80211_if_setup_no_queue;
1773                 else
1774                         if_setup = ieee80211_if_setup;
1775 
1776                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1777                         txqs = IEEE80211_NUM_ACS;
1778 
1779                 ndev = alloc_netdev_mqs(size + txq_size,
1780                                         name, name_assign_type,
1781                                         if_setup, txqs, 1);
1782                 if (!ndev)
1783                         return -ENOMEM;
1784                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1785 
1786                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1787                 if (!ndev->tstats) {
1788                         free_netdev(ndev);
1789                         return -ENOMEM;
1790                 }
1791 
1792                 ndev->needed_headroom = local->tx_headroom +
1793                                         4*6 /* four MAC addresses */
1794                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1795                                         + 6 /* mesh */
1796                                         + 8 /* rfc1042/bridge tunnel */
1797                                         - ETH_HLEN /* ethernet hard_header_len */
1798                                         + IEEE80211_ENCRYPT_HEADROOM;
1799                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1800 
1801                 ret = dev_alloc_name(ndev, ndev->name);
1802                 if (ret < 0) {
1803                         ieee80211_if_free(ndev);
1804                         return ret;
1805                 }
1806 
1807                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1808                 if (params && is_valid_ether_addr(params->macaddr))
1809                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1810                 else
1811                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1812                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1813 
1814                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1815                 sdata = netdev_priv(ndev);
1816                 ndev->ieee80211_ptr = &sdata->wdev;
1817                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1818                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1819 
1820                 if (txq_size) {
1821                         txqi = netdev_priv(ndev) + size;
1822                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1823                 }
1824 
1825                 sdata->dev = ndev;
1826         }
1827 
1828         /* initialise type-independent data */
1829         sdata->wdev.wiphy = local->hw.wiphy;
1830         sdata->local = local;
1831 
1832         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1833                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1834 
1835         INIT_LIST_HEAD(&sdata->key_list);
1836 
1837         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1838                           ieee80211_dfs_cac_timer_work);
1839         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1840                           ieee80211_delayed_tailroom_dec);
1841 
1842         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1843                 struct ieee80211_supported_band *sband;
1844                 sband = local->hw.wiphy->bands[i];
1845                 sdata->rc_rateidx_mask[i] =
1846                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1847                 if (sband) {
1848                         __le16 cap;
1849                         u16 *vht_rate_mask;
1850 
1851                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1852                                sband->ht_cap.mcs.rx_mask,
1853                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1854 
1855                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1856                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1857                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1858                 } else {
1859                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1860                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1861                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1862                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1863                 }
1864         }
1865 
1866         ieee80211_set_default_queues(sdata);
1867 
1868         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1869         sdata->user_power_level = local->user_power_level;
1870 
1871         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1872 
1873         /* setup type-dependent data */
1874         ieee80211_setup_sdata(sdata, type);
1875 
1876         if (ndev) {
1877                 if (params) {
1878                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1879                         if (type == NL80211_IFTYPE_STATION)
1880                                 sdata->u.mgd.use_4addr = params->use_4addr;
1881                 }
1882 
1883                 ndev->features |= local->hw.netdev_features;
1884 
1885                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1886 
1887                 ret = register_netdevice(ndev);
1888                 if (ret) {
1889                         ieee80211_if_free(ndev);
1890                         return ret;
1891                 }
1892         }
1893 
1894         mutex_lock(&local->iflist_mtx);
1895         list_add_tail_rcu(&sdata->list, &local->interfaces);
1896         mutex_unlock(&local->iflist_mtx);
1897 
1898         if (new_wdev)
1899                 *new_wdev = &sdata->wdev;
1900 
1901         return 0;
1902 }
1903 
1904 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1905 {
1906         ASSERT_RTNL();
1907 
1908         mutex_lock(&sdata->local->iflist_mtx);
1909         list_del_rcu(&sdata->list);
1910         mutex_unlock(&sdata->local->iflist_mtx);
1911 
1912         synchronize_rcu();
1913 
1914         if (sdata->dev) {
1915                 unregister_netdevice(sdata->dev);
1916         } else {
1917                 cfg80211_unregister_wdev(&sdata->wdev);
1918                 ieee80211_teardown_sdata(sdata);
1919                 kfree(sdata);
1920         }
1921 }
1922 
1923 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1924 {
1925         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1926                 return;
1927         ieee80211_do_stop(sdata, true);
1928 }
1929 
1930 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1931 {
1932         struct ieee80211_sub_if_data *sdata, *tmp;
1933         LIST_HEAD(unreg_list);
1934         LIST_HEAD(wdev_list);
1935 
1936         ASSERT_RTNL();
1937 
1938         /* Before destroying the interfaces, make sure they're all stopped so
1939          * that the hardware is stopped. Otherwise, the driver might still be
1940          * iterating the interfaces during the shutdown, e.g. from a worker
1941          * or from RX processing or similar, and if it does so (using atomic
1942          * iteration) while we're manipulating the list, the iteration will
1943          * crash.
1944          *
1945          * After this, the hardware should be stopped and the driver should
1946          * have stopped all of its activities, so that we can do RCU-unaware
1947          * manipulations of the interface list below.
1948          */
1949         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1950 
1951         WARN(local->open_count, "%s: open count remains %d\n",
1952              wiphy_name(local->hw.wiphy), local->open_count);
1953 
1954         mutex_lock(&local->iflist_mtx);
1955         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1956                 list_del(&sdata->list);
1957 
1958                 if (sdata->dev)
1959                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1960                 else
1961                         list_add(&sdata->list, &wdev_list);
1962         }
1963         mutex_unlock(&local->iflist_mtx);
1964         unregister_netdevice_many(&unreg_list);
1965 
1966         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1967                 list_del(&sdata->list);
1968                 cfg80211_unregister_wdev(&sdata->wdev);
1969                 kfree(sdata);
1970         }
1971 }
1972 
1973 static int netdev_notify(struct notifier_block *nb,
1974                          unsigned long state, void *ptr)
1975 {
1976         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1977         struct ieee80211_sub_if_data *sdata;
1978 
1979         if (state != NETDEV_CHANGENAME)
1980                 return NOTIFY_DONE;
1981 
1982         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1983                 return NOTIFY_DONE;
1984 
1985         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1986                 return NOTIFY_DONE;
1987 
1988         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1989         memcpy(sdata->name, dev->name, IFNAMSIZ);
1990         ieee80211_debugfs_rename_netdev(sdata);
1991 
1992         return NOTIFY_OK;
1993 }
1994 
1995 static struct notifier_block mac80211_netdev_notifier = {
1996         .notifier_call = netdev_notify,
1997 };
1998 
1999 int ieee80211_iface_init(void)
2000 {
2001         return register_netdevice_notifier(&mac80211_netdev_notifier);
2002 }
2003 
2004 void ieee80211_iface_exit(void)
2005 {
2006         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2007 }
2008 

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