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Linux/net/mac80211/iface.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Interface handling
  4  *
  5  * Copyright 2002-2005, Instant802 Networks, Inc.
  6  * Copyright 2005-2006, Devicescape Software, Inc.
  7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  9  * Copyright 2013-2014  Intel Mobile Communications GmbH
 10  * Copyright (c) 2016        Intel Deutschland GmbH
 11  * Copyright (C) 2018-2020 Intel Corporation
 12  */
 13 #include <linux/slab.h>
 14 #include <linux/kernel.h>
 15 #include <linux/if_arp.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/rtnetlink.h>
 18 #include <net/mac80211.h>
 19 #include <net/ieee80211_radiotap.h>
 20 #include "ieee80211_i.h"
 21 #include "sta_info.h"
 22 #include "debugfs_netdev.h"
 23 #include "mesh.h"
 24 #include "led.h"
 25 #include "driver-ops.h"
 26 #include "wme.h"
 27 #include "rate.h"
 28 
 29 /**
 30  * DOC: Interface list locking
 31  *
 32  * The interface list in each struct ieee80211_local is protected
 33  * three-fold:
 34  *
 35  * (1) modifications may only be done under the RTNL
 36  * (2) modifications and readers are protected against each other by
 37  *     the iflist_mtx.
 38  * (3) modifications are done in an RCU manner so atomic readers
 39  *     can traverse the list in RCU-safe blocks.
 40  *
 41  * As a consequence, reads (traversals) of the list can be protected
 42  * by either the RTNL, the iflist_mtx or RCU.
 43  */
 44 
 45 static void ieee80211_iface_work(struct work_struct *work);
 46 
 47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 48 {
 49         struct ieee80211_chanctx_conf *chanctx_conf;
 50         int power;
 51 
 52         rcu_read_lock();
 53         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 54         if (!chanctx_conf) {
 55                 rcu_read_unlock();
 56                 return false;
 57         }
 58 
 59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 60         rcu_read_unlock();
 61 
 62         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 63                 power = min(power, sdata->user_power_level);
 64 
 65         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 66                 power = min(power, sdata->ap_power_level);
 67 
 68         if (power != sdata->vif.bss_conf.txpower) {
 69                 sdata->vif.bss_conf.txpower = power;
 70                 ieee80211_hw_config(sdata->local, 0);
 71                 return true;
 72         }
 73 
 74         return false;
 75 }
 76 
 77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 78                               bool update_bss)
 79 {
 80         if (__ieee80211_recalc_txpower(sdata) ||
 81             (update_bss && ieee80211_sdata_running(sdata)))
 82                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 83 }
 84 
 85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 86 {
 87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 88                 return 0;
 89 
 90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 91         return IEEE80211_CONF_CHANGE_IDLE;
 92 }
 93 
 94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 95 {
 96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 97                 return 0;
 98 
 99         ieee80211_flush_queues(local, NULL, false);
100 
101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
102         return IEEE80211_CONF_CHANGE_IDLE;
103 }
104 
105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
106                                    bool force_active)
107 {
108         bool working, scanning, active;
109         unsigned int led_trig_start = 0, led_trig_stop = 0;
110 
111         lockdep_assert_held(&local->mtx);
112 
113         active = force_active ||
114                  !list_empty(&local->chanctx_list) ||
115                  local->monitors;
116 
117         working = !local->ops->remain_on_channel &&
118                   !list_empty(&local->roc_list);
119 
120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
122 
123         if (working || scanning)
124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125         else
126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 
128         if (active)
129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130         else
131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 
133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
134 
135         if (working || scanning || active)
136                 return __ieee80211_idle_off(local);
137         return __ieee80211_idle_on(local);
138 }
139 
140 u32 ieee80211_idle_off(struct ieee80211_local *local)
141 {
142         return __ieee80211_recalc_idle(local, true);
143 }
144 
145 void ieee80211_recalc_idle(struct ieee80211_local *local)
146 {
147         u32 change = __ieee80211_recalc_idle(local, false);
148         if (change)
149                 ieee80211_hw_config(local, change);
150 }
151 
152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
153                                 bool check_dup)
154 {
155         struct ieee80211_local *local = sdata->local;
156         struct ieee80211_sub_if_data *iter;
157         u64 new, mask, tmp;
158         u8 *m;
159         int ret = 0;
160 
161         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
162                 return 0;
163 
164         m = addr;
165         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
166                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
167                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
168 
169         m = local->hw.wiphy->addr_mask;
170         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
173 
174         if (!check_dup)
175                 return ret;
176 
177         mutex_lock(&local->iflist_mtx);
178         list_for_each_entry(iter, &local->interfaces, list) {
179                 if (iter == sdata)
180                         continue;
181 
182                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
183                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
184                         continue;
185 
186                 m = iter->vif.addr;
187                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
188                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
189                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
190 
191                 if ((new & ~mask) != (tmp & ~mask)) {
192                         ret = -EINVAL;
193                         break;
194                 }
195         }
196         mutex_unlock(&local->iflist_mtx);
197 
198         return ret;
199 }
200 
201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
202 {
203         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
204         struct sockaddr *sa = addr;
205         bool check_dup = true;
206         int ret;
207 
208         if (ieee80211_sdata_running(sdata))
209                 return -EBUSY;
210 
211         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
212             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
213                 check_dup = false;
214 
215         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
216         if (ret)
217                 return ret;
218 
219         ret = eth_mac_addr(dev, sa);
220 
221         if (ret == 0)
222                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
223 
224         return ret;
225 }
226 
227 static inline int identical_mac_addr_allowed(int type1, int type2)
228 {
229         return type1 == NL80211_IFTYPE_MONITOR ||
230                 type2 == NL80211_IFTYPE_MONITOR ||
231                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
232                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
233                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
234                 (type1 == NL80211_IFTYPE_WDS &&
235                         (type2 == NL80211_IFTYPE_WDS ||
236                          type2 == NL80211_IFTYPE_AP)) ||
237                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
238                 (type1 == NL80211_IFTYPE_AP_VLAN &&
239                         (type2 == NL80211_IFTYPE_AP ||
240                          type2 == NL80211_IFTYPE_AP_VLAN));
241 }
242 
243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
244                                             enum nl80211_iftype iftype)
245 {
246         struct ieee80211_local *local = sdata->local;
247         struct ieee80211_sub_if_data *nsdata;
248         int ret;
249 
250         ASSERT_RTNL();
251 
252         /* we hold the RTNL here so can safely walk the list */
253         list_for_each_entry(nsdata, &local->interfaces, list) {
254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
255                         /*
256                          * Only OCB and monitor mode may coexist
257                          */
258                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
259                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
260                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
261                              nsdata->vif.type == NL80211_IFTYPE_OCB))
262                                 return -EBUSY;
263 
264                         /*
265                          * Allow only a single IBSS interface to be up at any
266                          * time. This is restricted because beacon distribution
267                          * cannot work properly if both are in the same IBSS.
268                          *
269                          * To remove this restriction we'd have to disallow them
270                          * from setting the same SSID on different IBSS interfaces
271                          * belonging to the same hardware. Then, however, we're
272                          * faced with having to adopt two different TSF timers...
273                          */
274                         if (iftype == NL80211_IFTYPE_ADHOC &&
275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276                                 return -EBUSY;
277                         /*
278                          * will not add another interface while any channel
279                          * switch is active.
280                          */
281                         if (nsdata->vif.csa_active)
282                                 return -EBUSY;
283 
284                         /*
285                          * The remaining checks are only performed for interfaces
286                          * with the same MAC address.
287                          */
288                         if (!ether_addr_equal(sdata->vif.addr,
289                                               nsdata->vif.addr))
290                                 continue;
291 
292                         /*
293                          * check whether it may have the same address
294                          */
295                         if (!identical_mac_addr_allowed(iftype,
296                                                         nsdata->vif.type))
297                                 return -ENOTUNIQ;
298 
299                         /*
300                          * can only add VLANs to enabled APs
301                          */
302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
303                             nsdata->vif.type == NL80211_IFTYPE_AP)
304                                 sdata->bss = &nsdata->u.ap;
305                 }
306         }
307 
308         mutex_lock(&local->chanctx_mtx);
309         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
310         mutex_unlock(&local->chanctx_mtx);
311         return ret;
312 }
313 
314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
315                                   enum nl80211_iftype iftype)
316 {
317         int n_queues = sdata->local->hw.queues;
318         int i;
319 
320         if (iftype == NL80211_IFTYPE_NAN)
321                 return 0;
322 
323         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
324                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
326                                          IEEE80211_INVAL_HW_QUEUE))
327                                 return -EINVAL;
328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
329                                          n_queues))
330                                 return -EINVAL;
331                 }
332         }
333 
334         if ((iftype != NL80211_IFTYPE_AP &&
335              iftype != NL80211_IFTYPE_P2P_GO &&
336              iftype != NL80211_IFTYPE_MESH_POINT) ||
337             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
338                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
339                 return 0;
340         }
341 
342         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
343                 return -EINVAL;
344 
345         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
346                 return -EINVAL;
347 
348         return 0;
349 }
350 
351 static int ieee80211_open(struct net_device *dev)
352 {
353         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
354         int err;
355 
356         /* fail early if user set an invalid address */
357         if (!is_valid_ether_addr(dev->dev_addr))
358                 return -EADDRNOTAVAIL;
359 
360         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
361         if (err)
362                 return err;
363 
364         return ieee80211_do_open(&sdata->wdev, true);
365 }
366 
367 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
368                               bool going_down)
369 {
370         struct ieee80211_local *local = sdata->local;
371         unsigned long flags;
372         struct sk_buff *skb, *tmp;
373         u32 hw_reconf_flags = 0;
374         int i, flushed;
375         struct ps_data *ps;
376         struct cfg80211_chan_def chandef;
377         bool cancel_scan;
378         struct cfg80211_nan_func *func;
379 
380         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
381 
382         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
383         if (cancel_scan)
384                 ieee80211_scan_cancel(local);
385 
386         /*
387          * Stop TX on this interface first.
388          */
389         if (sdata->dev)
390                 netif_tx_stop_all_queues(sdata->dev);
391 
392         ieee80211_roc_purge(local, sdata);
393 
394         switch (sdata->vif.type) {
395         case NL80211_IFTYPE_STATION:
396                 ieee80211_mgd_stop(sdata);
397                 break;
398         case NL80211_IFTYPE_ADHOC:
399                 ieee80211_ibss_stop(sdata);
400                 break;
401         case NL80211_IFTYPE_MONITOR:
402                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
403                         break;
404                 list_del_rcu(&sdata->u.mntr.list);
405                 break;
406         default:
407                 break;
408         }
409 
410         /*
411          * Remove all stations associated with this interface.
412          *
413          * This must be done before calling ops->remove_interface()
414          * because otherwise we can later invoke ops->sta_notify()
415          * whenever the STAs are removed, and that invalidates driver
416          * assumptions about always getting a vif pointer that is valid
417          * (because if we remove a STA after ops->remove_interface()
418          * the driver will have removed the vif info already!)
419          *
420          * In WDS mode a station must exist here and be flushed, for
421          * AP_VLANs stations may exist since there's nothing else that
422          * would have removed them, but in other modes there shouldn't
423          * be any stations.
424          */
425         flushed = sta_info_flush(sdata);
426         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
427                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
428                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
429 
430         /* don't count this interface for allmulti while it is down */
431         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
432                 atomic_dec(&local->iff_allmultis);
433 
434         if (sdata->vif.type == NL80211_IFTYPE_AP) {
435                 local->fif_pspoll--;
436                 local->fif_probe_req--;
437         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
438                 local->fif_probe_req--;
439         }
440 
441         if (sdata->dev) {
442                 netif_addr_lock_bh(sdata->dev);
443                 spin_lock_bh(&local->filter_lock);
444                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
445                                  sdata->dev->addr_len);
446                 spin_unlock_bh(&local->filter_lock);
447                 netif_addr_unlock_bh(sdata->dev);
448         }
449 
450         del_timer_sync(&local->dynamic_ps_timer);
451         cancel_work_sync(&local->dynamic_ps_enable_work);
452 
453         cancel_work_sync(&sdata->recalc_smps);
454         sdata_lock(sdata);
455         mutex_lock(&local->mtx);
456         sdata->vif.csa_active = false;
457         if (sdata->vif.type == NL80211_IFTYPE_STATION)
458                 sdata->u.mgd.csa_waiting_bcn = false;
459         if (sdata->csa_block_tx) {
460                 ieee80211_wake_vif_queues(local, sdata,
461                                           IEEE80211_QUEUE_STOP_REASON_CSA);
462                 sdata->csa_block_tx = false;
463         }
464         mutex_unlock(&local->mtx);
465         sdata_unlock(sdata);
466 
467         cancel_work_sync(&sdata->csa_finalize_work);
468 
469         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
470 
471         if (sdata->wdev.cac_started) {
472                 chandef = sdata->vif.bss_conf.chandef;
473                 WARN_ON(local->suspended);
474                 mutex_lock(&local->mtx);
475                 ieee80211_vif_release_channel(sdata);
476                 mutex_unlock(&local->mtx);
477                 cfg80211_cac_event(sdata->dev, &chandef,
478                                    NL80211_RADAR_CAC_ABORTED,
479                                    GFP_KERNEL);
480         }
481 
482         /* APs need special treatment */
483         if (sdata->vif.type == NL80211_IFTYPE_AP) {
484                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
485 
486                 /* down all dependent devices, that is VLANs */
487                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
488                                          u.vlan.list)
489                         dev_close(vlan->dev);
490                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
491         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
492                 /* remove all packets in parent bc_buf pointing to this dev */
493                 ps = &sdata->bss->ps;
494 
495                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
496                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
497                         if (skb->dev == sdata->dev) {
498                                 __skb_unlink(skb, &ps->bc_buf);
499                                 local->total_ps_buffered--;
500                                 ieee80211_free_txskb(&local->hw, skb);
501                         }
502                 }
503                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
504         }
505 
506         if (going_down)
507                 local->open_count--;
508 
509         switch (sdata->vif.type) {
510         case NL80211_IFTYPE_AP_VLAN:
511                 mutex_lock(&local->mtx);
512                 list_del(&sdata->u.vlan.list);
513                 mutex_unlock(&local->mtx);
514                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
515                 /* see comment in the default case below */
516                 ieee80211_free_keys(sdata, true);
517                 /* no need to tell driver */
518                 break;
519         case NL80211_IFTYPE_MONITOR:
520                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
521                         local->cooked_mntrs--;
522                         break;
523                 }
524 
525                 local->monitors--;
526                 if (local->monitors == 0) {
527                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
528                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
529                 }
530 
531                 ieee80211_adjust_monitor_flags(sdata, -1);
532                 break;
533         case NL80211_IFTYPE_NAN:
534                 /* clean all the functions */
535                 spin_lock_bh(&sdata->u.nan.func_lock);
536 
537                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
538                         idr_remove(&sdata->u.nan.function_inst_ids, i);
539                         cfg80211_free_nan_func(func);
540                 }
541                 idr_destroy(&sdata->u.nan.function_inst_ids);
542 
543                 spin_unlock_bh(&sdata->u.nan.func_lock);
544                 break;
545         case NL80211_IFTYPE_P2P_DEVICE:
546                 /* relies on synchronize_rcu() below */
547                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
548                 fallthrough;
549         default:
550                 cancel_work_sync(&sdata->work);
551                 /*
552                  * When we get here, the interface is marked down.
553                  * Free the remaining keys, if there are any
554                  * (which can happen in AP mode if userspace sets
555                  * keys before the interface is operating, and maybe
556                  * also in WDS mode)
557                  *
558                  * Force the key freeing to always synchronize_net()
559                  * to wait for the RX path in case it is using this
560                  * interface enqueuing frames at this very time on
561                  * another CPU.
562                  */
563                 ieee80211_free_keys(sdata, true);
564                 skb_queue_purge(&sdata->skb_queue);
565         }
566 
567         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
568         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
569                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
570                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
571                         if (info->control.vif == &sdata->vif) {
572                                 __skb_unlink(skb, &local->pending[i]);
573                                 ieee80211_free_txskb(&local->hw, skb);
574                         }
575                 }
576         }
577         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
578 
579         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
580                 ieee80211_txq_remove_vlan(local, sdata);
581 
582         sdata->bss = NULL;
583 
584         if (local->open_count == 0)
585                 ieee80211_clear_tx_pending(local);
586 
587         sdata->vif.bss_conf.beacon_int = 0;
588 
589         /*
590          * If the interface goes down while suspended, presumably because
591          * the device was unplugged and that happens before our resume,
592          * then the driver is already unconfigured and the remainder of
593          * this function isn't needed.
594          * XXX: what about WoWLAN? If the device has software state, e.g.
595          *      memory allocated, it might expect teardown commands from
596          *      mac80211 here?
597          */
598         if (local->suspended) {
599                 WARN_ON(local->wowlan);
600                 WARN_ON(rtnl_dereference(local->monitor_sdata));
601                 return;
602         }
603 
604         switch (sdata->vif.type) {
605         case NL80211_IFTYPE_AP_VLAN:
606                 break;
607         case NL80211_IFTYPE_MONITOR:
608                 if (local->monitors == 0)
609                         ieee80211_del_virtual_monitor(local);
610 
611                 mutex_lock(&local->mtx);
612                 ieee80211_recalc_idle(local);
613                 mutex_unlock(&local->mtx);
614 
615                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
616                         break;
617 
618                 fallthrough;
619         default:
620                 if (going_down)
621                         drv_remove_interface(local, sdata);
622         }
623 
624         ieee80211_recalc_ps(local);
625 
626         if (cancel_scan)
627                 flush_delayed_work(&local->scan_work);
628 
629         if (local->open_count == 0) {
630                 ieee80211_stop_device(local);
631 
632                 /* no reconfiguring after stop! */
633                 return;
634         }
635 
636         /* do after stop to avoid reconfiguring when we stop anyway */
637         ieee80211_configure_filter(local);
638         ieee80211_hw_config(local, hw_reconf_flags);
639 
640         if (local->monitors == local->open_count)
641                 ieee80211_add_virtual_monitor(local);
642 }
643 
644 static int ieee80211_stop(struct net_device *dev)
645 {
646         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
647 
648         ieee80211_do_stop(sdata, true);
649 
650         return 0;
651 }
652 
653 static void ieee80211_set_multicast_list(struct net_device *dev)
654 {
655         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
656         struct ieee80211_local *local = sdata->local;
657         int allmulti, sdata_allmulti;
658 
659         allmulti = !!(dev->flags & IFF_ALLMULTI);
660         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
661 
662         if (allmulti != sdata_allmulti) {
663                 if (dev->flags & IFF_ALLMULTI)
664                         atomic_inc(&local->iff_allmultis);
665                 else
666                         atomic_dec(&local->iff_allmultis);
667                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
668         }
669 
670         spin_lock_bh(&local->filter_lock);
671         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
672         spin_unlock_bh(&local->filter_lock);
673         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
674 }
675 
676 /*
677  * Called when the netdev is removed or, by the code below, before
678  * the interface type changes.
679  */
680 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
681 {
682         int i;
683 
684         /* free extra data */
685         ieee80211_free_keys(sdata, false);
686 
687         ieee80211_debugfs_remove_netdev(sdata);
688 
689         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
690                 __skb_queue_purge(&sdata->fragments[i].skb_list);
691         sdata->fragment_next = 0;
692 
693         if (ieee80211_vif_is_mesh(&sdata->vif))
694                 ieee80211_mesh_teardown_sdata(sdata);
695 }
696 
697 static void ieee80211_uninit(struct net_device *dev)
698 {
699         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
700 }
701 
702 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
703                                          struct sk_buff *skb,
704                                          struct net_device *sb_dev)
705 {
706         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
707 }
708 
709 static void
710 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
711 {
712         dev_fetch_sw_netstats(stats, dev->tstats);
713 }
714 
715 static const struct net_device_ops ieee80211_dataif_ops = {
716         .ndo_open               = ieee80211_open,
717         .ndo_stop               = ieee80211_stop,
718         .ndo_uninit             = ieee80211_uninit,
719         .ndo_start_xmit         = ieee80211_subif_start_xmit,
720         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
721         .ndo_set_mac_address    = ieee80211_change_mac,
722         .ndo_select_queue       = ieee80211_netdev_select_queue,
723         .ndo_get_stats64        = ieee80211_get_stats64,
724 };
725 
726 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
727                                           struct sk_buff *skb,
728                                           struct net_device *sb_dev)
729 {
730         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
731         struct ieee80211_local *local = sdata->local;
732         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
733         struct ieee80211_hdr *hdr;
734         int len_rthdr;
735 
736         if (local->hw.queues < IEEE80211_NUM_ACS)
737                 return 0;
738 
739         /* reset flags and info before parsing radiotap header */
740         memset(info, 0, sizeof(*info));
741 
742         if (!ieee80211_parse_tx_radiotap(skb, dev))
743                 return 0; /* doesn't matter, frame will be dropped */
744 
745         len_rthdr = ieee80211_get_radiotap_len(skb->data);
746         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
747         if (skb->len < len_rthdr + 2 ||
748             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
749                 return 0; /* doesn't matter, frame will be dropped */
750 
751         return ieee80211_select_queue_80211(sdata, skb, hdr);
752 }
753 
754 static const struct net_device_ops ieee80211_monitorif_ops = {
755         .ndo_open               = ieee80211_open,
756         .ndo_stop               = ieee80211_stop,
757         .ndo_uninit             = ieee80211_uninit,
758         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
759         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
760         .ndo_set_mac_address    = ieee80211_change_mac,
761         .ndo_select_queue       = ieee80211_monitor_select_queue,
762         .ndo_get_stats64        = ieee80211_get_stats64,
763 };
764 
765 static const struct net_device_ops ieee80211_dataif_8023_ops = {
766         .ndo_open               = ieee80211_open,
767         .ndo_stop               = ieee80211_stop,
768         .ndo_uninit             = ieee80211_uninit,
769         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
770         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
771         .ndo_set_mac_address    = ieee80211_change_mac,
772         .ndo_select_queue       = ieee80211_netdev_select_queue,
773         .ndo_get_stats64        = ieee80211_get_stats64,
774 };
775 
776 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
777 {
778         switch (iftype) {
779         /* P2P GO and client are mapped to AP/STATION types */
780         case NL80211_IFTYPE_AP:
781         case NL80211_IFTYPE_STATION:
782                 return true;
783         default:
784                 return false;
785         }
786 }
787 
788 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
789 {
790         struct ieee80211_local *local = sdata->local;
791         u32 flags;
792 
793         flags = sdata->vif.offload_flags;
794 
795         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
796             ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
797                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
798 
799                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
800                     local->hw.wiphy->frag_threshold != (u32)-1)
801                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
802 
803                 if (local->monitors)
804                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
805         } else {
806                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
807         }
808 
809         if (sdata->vif.offload_flags == flags)
810                 return false;
811 
812         sdata->vif.offload_flags = flags;
813         return true;
814 }
815 
816 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
817 {
818         struct ieee80211_local *local = sdata->local;
819         struct ieee80211_sub_if_data *bss = sdata;
820         bool enabled;
821 
822         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
823                 if (!sdata->bss)
824                         return;
825 
826                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
827         }
828 
829         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
830             !ieee80211_iftype_supports_encap_offload(bss->vif.type))
831                 return;
832 
833         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
834         if (sdata->wdev.use_4addr &&
835             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
836                 enabled = false;
837 
838         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
839                                            &ieee80211_dataif_ops;
840 }
841 
842 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
843 {
844         struct ieee80211_local *local = sdata->local;
845         struct ieee80211_sub_if_data *vsdata;
846 
847         if (ieee80211_set_sdata_offload_flags(sdata)) {
848                 drv_update_vif_offload(local, sdata);
849                 ieee80211_set_vif_encap_ops(sdata);
850         }
851 
852         list_for_each_entry(vsdata, &local->interfaces, list) {
853                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
854                     vsdata->bss != &sdata->u.ap)
855                         continue;
856 
857                 ieee80211_set_vif_encap_ops(vsdata);
858         }
859 }
860 
861 void ieee80211_recalc_offload(struct ieee80211_local *local)
862 {
863         struct ieee80211_sub_if_data *sdata;
864 
865         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
866                 return;
867 
868         mutex_lock(&local->iflist_mtx);
869 
870         list_for_each_entry(sdata, &local->interfaces, list) {
871                 if (!ieee80211_sdata_running(sdata))
872                         continue;
873 
874                 ieee80211_recalc_sdata_offload(sdata);
875         }
876 
877         mutex_unlock(&local->iflist_mtx);
878 }
879 
880 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
881                                     const int offset)
882 {
883         struct ieee80211_local *local = sdata->local;
884         u32 flags = sdata->u.mntr.flags;
885 
886 #define ADJUST(_f, _s)  do {                                    \
887         if (flags & MONITOR_FLAG_##_f)                          \
888                 local->fif_##_s += offset;                      \
889         } while (0)
890 
891         ADJUST(FCSFAIL, fcsfail);
892         ADJUST(PLCPFAIL, plcpfail);
893         ADJUST(CONTROL, control);
894         ADJUST(CONTROL, pspoll);
895         ADJUST(OTHER_BSS, other_bss);
896 
897 #undef ADJUST
898 }
899 
900 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
901 {
902         struct ieee80211_local *local = sdata->local;
903         int i;
904 
905         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
906                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
907                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
908                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
909                         sdata->vif.hw_queue[i] = i;
910                 else
911                         sdata->vif.hw_queue[i] = 0;
912         }
913         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
914 }
915 
916 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
917 {
918         struct ieee80211_sub_if_data *sdata;
919         int ret;
920 
921         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
922                 return 0;
923 
924         ASSERT_RTNL();
925 
926         if (local->monitor_sdata)
927                 return 0;
928 
929         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
930         if (!sdata)
931                 return -ENOMEM;
932 
933         /* set up data */
934         sdata->local = local;
935         sdata->vif.type = NL80211_IFTYPE_MONITOR;
936         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
937                  wiphy_name(local->hw.wiphy));
938         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
939 
940         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
941 
942         ieee80211_set_default_queues(sdata);
943 
944         ret = drv_add_interface(local, sdata);
945         if (WARN_ON(ret)) {
946                 /* ok .. stupid driver, it asked for this! */
947                 kfree(sdata);
948                 return ret;
949         }
950 
951         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
952         if (ret) {
953                 kfree(sdata);
954                 return ret;
955         }
956 
957         mutex_lock(&local->iflist_mtx);
958         rcu_assign_pointer(local->monitor_sdata, sdata);
959         mutex_unlock(&local->iflist_mtx);
960 
961         mutex_lock(&local->mtx);
962         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
963                                         IEEE80211_CHANCTX_EXCLUSIVE);
964         mutex_unlock(&local->mtx);
965         if (ret) {
966                 mutex_lock(&local->iflist_mtx);
967                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
968                 mutex_unlock(&local->iflist_mtx);
969                 synchronize_net();
970                 drv_remove_interface(local, sdata);
971                 kfree(sdata);
972                 return ret;
973         }
974 
975         skb_queue_head_init(&sdata->skb_queue);
976         INIT_WORK(&sdata->work, ieee80211_iface_work);
977 
978         return 0;
979 }
980 
981 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
982 {
983         struct ieee80211_sub_if_data *sdata;
984 
985         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
986                 return;
987 
988         ASSERT_RTNL();
989 
990         mutex_lock(&local->iflist_mtx);
991 
992         sdata = rcu_dereference_protected(local->monitor_sdata,
993                                           lockdep_is_held(&local->iflist_mtx));
994         if (!sdata) {
995                 mutex_unlock(&local->iflist_mtx);
996                 return;
997         }
998 
999         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1000         mutex_unlock(&local->iflist_mtx);
1001 
1002         synchronize_net();
1003 
1004         mutex_lock(&local->mtx);
1005         ieee80211_vif_release_channel(sdata);
1006         mutex_unlock(&local->mtx);
1007 
1008         drv_remove_interface(local, sdata);
1009 
1010         kfree(sdata);
1011 }
1012 
1013 /*
1014  * NOTE: Be very careful when changing this function, it must NOT return
1015  * an error on interface type changes that have been pre-checked, so most
1016  * checks should be in ieee80211_check_concurrent_iface.
1017  */
1018 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1019 {
1020         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1021         struct net_device *dev = wdev->netdev;
1022         struct ieee80211_local *local = sdata->local;
1023         struct sta_info *sta;
1024         u32 changed = 0;
1025         int res;
1026         u32 hw_reconf_flags = 0;
1027 
1028         switch (sdata->vif.type) {
1029         case NL80211_IFTYPE_WDS:
1030                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
1031                         return -ENOLINK;
1032                 break;
1033         case NL80211_IFTYPE_AP_VLAN: {
1034                 struct ieee80211_sub_if_data *master;
1035 
1036                 if (!sdata->bss)
1037                         return -ENOLINK;
1038 
1039                 mutex_lock(&local->mtx);
1040                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1041                 mutex_unlock(&local->mtx);
1042 
1043                 master = container_of(sdata->bss,
1044                                       struct ieee80211_sub_if_data, u.ap);
1045                 sdata->control_port_protocol =
1046                         master->control_port_protocol;
1047                 sdata->control_port_no_encrypt =
1048                         master->control_port_no_encrypt;
1049                 sdata->control_port_over_nl80211 =
1050                         master->control_port_over_nl80211;
1051                 sdata->control_port_no_preauth =
1052                         master->control_port_no_preauth;
1053                 sdata->vif.cab_queue = master->vif.cab_queue;
1054                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1055                        sizeof(sdata->vif.hw_queue));
1056                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1057 
1058                 mutex_lock(&local->key_mtx);
1059                 sdata->crypto_tx_tailroom_needed_cnt +=
1060                         master->crypto_tx_tailroom_needed_cnt;
1061                 mutex_unlock(&local->key_mtx);
1062 
1063                 break;
1064                 }
1065         case NL80211_IFTYPE_AP:
1066                 sdata->bss = &sdata->u.ap;
1067                 break;
1068         case NL80211_IFTYPE_MESH_POINT:
1069         case NL80211_IFTYPE_STATION:
1070         case NL80211_IFTYPE_MONITOR:
1071         case NL80211_IFTYPE_ADHOC:
1072         case NL80211_IFTYPE_P2P_DEVICE:
1073         case NL80211_IFTYPE_OCB:
1074         case NL80211_IFTYPE_NAN:
1075                 /* no special treatment */
1076                 break;
1077         case NL80211_IFTYPE_UNSPECIFIED:
1078         case NUM_NL80211_IFTYPES:
1079         case NL80211_IFTYPE_P2P_CLIENT:
1080         case NL80211_IFTYPE_P2P_GO:
1081                 /* cannot happen */
1082                 WARN_ON(1);
1083                 break;
1084         }
1085 
1086         if (local->open_count == 0) {
1087                 res = drv_start(local);
1088                 if (res)
1089                         goto err_del_bss;
1090                 /* we're brought up, everything changes */
1091                 hw_reconf_flags = ~0;
1092                 ieee80211_led_radio(local, true);
1093                 ieee80211_mod_tpt_led_trig(local,
1094                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1095         }
1096 
1097         /*
1098          * Copy the hopefully now-present MAC address to
1099          * this interface, if it has the special null one.
1100          */
1101         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1102                 memcpy(dev->dev_addr,
1103                        local->hw.wiphy->perm_addr,
1104                        ETH_ALEN);
1105                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1106 
1107                 if (!is_valid_ether_addr(dev->dev_addr)) {
1108                         res = -EADDRNOTAVAIL;
1109                         goto err_stop;
1110                 }
1111         }
1112 
1113         switch (sdata->vif.type) {
1114         case NL80211_IFTYPE_AP_VLAN:
1115                 /* no need to tell driver, but set carrier and chanctx */
1116                 if (rtnl_dereference(sdata->bss->beacon)) {
1117                         ieee80211_vif_vlan_copy_chanctx(sdata);
1118                         netif_carrier_on(dev);
1119                         ieee80211_set_vif_encap_ops(sdata);
1120                 } else {
1121                         netif_carrier_off(dev);
1122                 }
1123                 break;
1124         case NL80211_IFTYPE_MONITOR:
1125                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1126                         local->cooked_mntrs++;
1127                         break;
1128                 }
1129 
1130                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1131                         res = drv_add_interface(local, sdata);
1132                         if (res)
1133                                 goto err_stop;
1134                 } else if (local->monitors == 0 && local->open_count == 0) {
1135                         res = ieee80211_add_virtual_monitor(local);
1136                         if (res)
1137                                 goto err_stop;
1138                 }
1139 
1140                 /* must be before the call to ieee80211_configure_filter */
1141                 local->monitors++;
1142                 if (local->monitors == 1) {
1143                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1144                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1145                 }
1146 
1147                 ieee80211_adjust_monitor_flags(sdata, 1);
1148                 ieee80211_configure_filter(local);
1149                 ieee80211_recalc_offload(local);
1150                 mutex_lock(&local->mtx);
1151                 ieee80211_recalc_idle(local);
1152                 mutex_unlock(&local->mtx);
1153 
1154                 netif_carrier_on(dev);
1155                 break;
1156         default:
1157                 if (coming_up) {
1158                         ieee80211_del_virtual_monitor(local);
1159                         ieee80211_set_sdata_offload_flags(sdata);
1160 
1161                         res = drv_add_interface(local, sdata);
1162                         if (res)
1163                                 goto err_stop;
1164 
1165                         ieee80211_set_vif_encap_ops(sdata);
1166                         res = ieee80211_check_queues(sdata,
1167                                 ieee80211_vif_type_p2p(&sdata->vif));
1168                         if (res)
1169                                 goto err_del_interface;
1170                 }
1171 
1172                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1173                         local->fif_pspoll++;
1174                         local->fif_probe_req++;
1175 
1176                         ieee80211_configure_filter(local);
1177                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1178                         local->fif_probe_req++;
1179                 }
1180 
1181                 if (sdata->vif.probe_req_reg)
1182                         drv_config_iface_filter(local, sdata,
1183                                                 FIF_PROBE_REQ,
1184                                                 FIF_PROBE_REQ);
1185 
1186                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1187                     sdata->vif.type != NL80211_IFTYPE_NAN)
1188                         changed |= ieee80211_reset_erp_info(sdata);
1189                 ieee80211_bss_info_change_notify(sdata, changed);
1190 
1191                 switch (sdata->vif.type) {
1192                 case NL80211_IFTYPE_STATION:
1193                 case NL80211_IFTYPE_ADHOC:
1194                 case NL80211_IFTYPE_AP:
1195                 case NL80211_IFTYPE_MESH_POINT:
1196                 case NL80211_IFTYPE_OCB:
1197                         netif_carrier_off(dev);
1198                         break;
1199                 case NL80211_IFTYPE_WDS:
1200                 case NL80211_IFTYPE_P2P_DEVICE:
1201                 case NL80211_IFTYPE_NAN:
1202                         break;
1203                 default:
1204                         /* not reached */
1205                         WARN_ON(1);
1206                 }
1207 
1208                 /*
1209                  * Set default queue parameters so drivers don't
1210                  * need to initialise the hardware if the hardware
1211                  * doesn't start up with sane defaults.
1212                  * Enable QoS for anything but station interfaces.
1213                  */
1214                 ieee80211_set_wmm_default(sdata, true,
1215                         sdata->vif.type != NL80211_IFTYPE_STATION);
1216         }
1217 
1218         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1219 
1220         switch (sdata->vif.type) {
1221         case NL80211_IFTYPE_WDS:
1222                 /* Create STA entry for the WDS peer */
1223                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
1224                                      GFP_KERNEL);
1225                 if (!sta) {
1226                         res = -ENOMEM;
1227                         goto err_del_interface;
1228                 }
1229 
1230                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
1231                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
1232                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
1233 
1234                 res = sta_info_insert(sta);
1235                 if (res) {
1236                         /* STA has been freed */
1237                         goto err_del_interface;
1238                 }
1239 
1240                 rate_control_rate_init(sta);
1241                 netif_carrier_on(dev);
1242                 break;
1243         case NL80211_IFTYPE_P2P_DEVICE:
1244                 rcu_assign_pointer(local->p2p_sdata, sdata);
1245                 break;
1246         case NL80211_IFTYPE_MONITOR:
1247                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1248                         break;
1249                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1250                 break;
1251         default:
1252                 break;
1253         }
1254 
1255         /*
1256          * set_multicast_list will be invoked by the networking core
1257          * which will check whether any increments here were done in
1258          * error and sync them down to the hardware as filter flags.
1259          */
1260         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1261                 atomic_inc(&local->iff_allmultis);
1262 
1263         if (coming_up)
1264                 local->open_count++;
1265 
1266         if (hw_reconf_flags)
1267                 ieee80211_hw_config(local, hw_reconf_flags);
1268 
1269         ieee80211_recalc_ps(local);
1270 
1271         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1272             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1273             local->ops->wake_tx_queue) {
1274                 /* XXX: for AP_VLAN, actually track AP queues */
1275                 if (dev)
1276                         netif_tx_start_all_queues(dev);
1277         } else if (dev) {
1278                 unsigned long flags;
1279                 int n_acs = IEEE80211_NUM_ACS;
1280                 int ac;
1281 
1282                 if (local->hw.queues < IEEE80211_NUM_ACS)
1283                         n_acs = 1;
1284 
1285                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1286                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1287                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1288                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1289                         for (ac = 0; ac < n_acs; ac++) {
1290                                 int ac_queue = sdata->vif.hw_queue[ac];
1291 
1292                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1293                                     skb_queue_empty(&local->pending[ac_queue]))
1294                                         netif_start_subqueue(dev, ac);
1295                         }
1296                 }
1297                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1298         }
1299 
1300         return 0;
1301  err_del_interface:
1302         drv_remove_interface(local, sdata);
1303  err_stop:
1304         if (!local->open_count)
1305                 drv_stop(local);
1306  err_del_bss:
1307         sdata->bss = NULL;
1308         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1309                 mutex_lock(&local->mtx);
1310                 list_del(&sdata->u.vlan.list);
1311                 mutex_unlock(&local->mtx);
1312         }
1313         /* might already be clear but that doesn't matter */
1314         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1315         return res;
1316 }
1317 
1318 static void ieee80211_if_free(struct net_device *dev)
1319 {
1320         free_percpu(dev->tstats);
1321 }
1322 
1323 static void ieee80211_if_setup(struct net_device *dev)
1324 {
1325         ether_setup(dev);
1326         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1327         dev->netdev_ops = &ieee80211_dataif_ops;
1328         dev->needs_free_netdev = true;
1329         dev->priv_destructor = ieee80211_if_free;
1330 }
1331 
1332 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1333 {
1334         ieee80211_if_setup(dev);
1335         dev->priv_flags |= IFF_NO_QUEUE;
1336 }
1337 
1338 static void ieee80211_iface_work(struct work_struct *work)
1339 {
1340         struct ieee80211_sub_if_data *sdata =
1341                 container_of(work, struct ieee80211_sub_if_data, work);
1342         struct ieee80211_local *local = sdata->local;
1343         struct sk_buff *skb;
1344         struct sta_info *sta;
1345 
1346         if (!ieee80211_sdata_running(sdata))
1347                 return;
1348 
1349         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1350                 return;
1351 
1352         if (!ieee80211_can_run_worker(local))
1353                 return;
1354 
1355         /* first process frames */
1356         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1357                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1358 
1359                 if (ieee80211_is_action(mgmt->frame_control) &&
1360                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1361                         int len = skb->len;
1362 
1363                         mutex_lock(&local->sta_mtx);
1364                         sta = sta_info_get_bss(sdata, mgmt->sa);
1365                         if (sta) {
1366                                 switch (mgmt->u.action.u.addba_req.action_code) {
1367                                 case WLAN_ACTION_ADDBA_REQ:
1368                                         ieee80211_process_addba_request(
1369                                                         local, sta, mgmt, len);
1370                                         break;
1371                                 case WLAN_ACTION_ADDBA_RESP:
1372                                         ieee80211_process_addba_resp(local, sta,
1373                                                                      mgmt, len);
1374                                         break;
1375                                 case WLAN_ACTION_DELBA:
1376                                         ieee80211_process_delba(sdata, sta,
1377                                                                 mgmt, len);
1378                                         break;
1379                                 default:
1380                                         WARN_ON(1);
1381                                         break;
1382                                 }
1383                         }
1384                         mutex_unlock(&local->sta_mtx);
1385                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1386                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1387                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1388                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1389                                 struct ieee80211_rx_status *status;
1390                                 enum nl80211_band band;
1391                                 u8 opmode;
1392 
1393                                 status = IEEE80211_SKB_RXCB(skb);
1394                                 band = status->band;
1395                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1396 
1397                                 mutex_lock(&local->sta_mtx);
1398                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1399 
1400                                 if (sta)
1401                                         ieee80211_vht_handle_opmode(sdata, sta,
1402                                                                     opmode,
1403                                                                     band);
1404 
1405                                 mutex_unlock(&local->sta_mtx);
1406                                 break;
1407                         }
1408                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1409                                 ieee80211_process_mu_groups(sdata, mgmt);
1410                                 break;
1411                         default:
1412                                 WARN_ON(1);
1413                                 break;
1414                         }
1415                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1416                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1417                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1418                         else
1419                                 WARN_ON(1);
1420                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1421                         struct ieee80211_hdr *hdr = (void *)mgmt;
1422                         /*
1423                          * So the frame isn't mgmt, but frame_control
1424                          * is at the right place anyway, of course, so
1425                          * the if statement is correct.
1426                          *
1427                          * Warn if we have other data frame types here,
1428                          * they must not get here.
1429                          */
1430                         WARN_ON(hdr->frame_control &
1431                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1432                         WARN_ON(!(hdr->seq_ctrl &
1433                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1434                         /*
1435                          * This was a fragment of a frame, received while
1436                          * a block-ack session was active. That cannot be
1437                          * right, so terminate the session.
1438                          */
1439                         mutex_lock(&local->sta_mtx);
1440                         sta = sta_info_get_bss(sdata, mgmt->sa);
1441                         if (sta) {
1442                                 u16 tid = ieee80211_get_tid(hdr);
1443 
1444                                 __ieee80211_stop_rx_ba_session(
1445                                         sta, tid, WLAN_BACK_RECIPIENT,
1446                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1447                                         true);
1448                         }
1449                         mutex_unlock(&local->sta_mtx);
1450                 } else switch (sdata->vif.type) {
1451                 case NL80211_IFTYPE_STATION:
1452                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1453                         break;
1454                 case NL80211_IFTYPE_ADHOC:
1455                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1456                         break;
1457                 case NL80211_IFTYPE_MESH_POINT:
1458                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1459                                 break;
1460                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1461                         break;
1462                 default:
1463                         WARN(1, "frame for unexpected interface type");
1464                         break;
1465                 }
1466 
1467                 kfree_skb(skb);
1468         }
1469 
1470         /* then other type-dependent work */
1471         switch (sdata->vif.type) {
1472         case NL80211_IFTYPE_STATION:
1473                 ieee80211_sta_work(sdata);
1474                 break;
1475         case NL80211_IFTYPE_ADHOC:
1476                 ieee80211_ibss_work(sdata);
1477                 break;
1478         case NL80211_IFTYPE_MESH_POINT:
1479                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1480                         break;
1481                 ieee80211_mesh_work(sdata);
1482                 break;
1483         case NL80211_IFTYPE_OCB:
1484                 ieee80211_ocb_work(sdata);
1485                 break;
1486         default:
1487                 break;
1488         }
1489 }
1490 
1491 static void ieee80211_recalc_smps_work(struct work_struct *work)
1492 {
1493         struct ieee80211_sub_if_data *sdata =
1494                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1495 
1496         ieee80211_recalc_smps(sdata);
1497 }
1498 
1499 /*
1500  * Helper function to initialise an interface to a specific type.
1501  */
1502 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1503                                   enum nl80211_iftype type)
1504 {
1505         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1506                                                     0xff, 0xff, 0xff};
1507 
1508         /* clear type-dependent union */
1509         memset(&sdata->u, 0, sizeof(sdata->u));
1510 
1511         /* and set some type-dependent values */
1512         sdata->vif.type = type;
1513         sdata->vif.p2p = false;
1514         sdata->wdev.iftype = type;
1515 
1516         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1517         sdata->control_port_no_encrypt = false;
1518         sdata->control_port_over_nl80211 = false;
1519         sdata->control_port_no_preauth = false;
1520         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1521         sdata->vif.bss_conf.idle = true;
1522         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1523 
1524         sdata->noack_map = 0;
1525 
1526         /* only monitor/p2p-device differ */
1527         if (sdata->dev) {
1528                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1529                 sdata->dev->type = ARPHRD_ETHER;
1530         }
1531 
1532         skb_queue_head_init(&sdata->skb_queue);
1533         INIT_WORK(&sdata->work, ieee80211_iface_work);
1534         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1535         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1536         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1537         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1538 
1539         switch (type) {
1540         case NL80211_IFTYPE_P2P_GO:
1541                 type = NL80211_IFTYPE_AP;
1542                 sdata->vif.type = type;
1543                 sdata->vif.p2p = true;
1544                 fallthrough;
1545         case NL80211_IFTYPE_AP:
1546                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1547                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1548                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1549                 break;
1550         case NL80211_IFTYPE_P2P_CLIENT:
1551                 type = NL80211_IFTYPE_STATION;
1552                 sdata->vif.type = type;
1553                 sdata->vif.p2p = true;
1554                 fallthrough;
1555         case NL80211_IFTYPE_STATION:
1556                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1557                 ieee80211_sta_setup_sdata(sdata);
1558                 break;
1559         case NL80211_IFTYPE_OCB:
1560                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1561                 ieee80211_ocb_setup_sdata(sdata);
1562                 break;
1563         case NL80211_IFTYPE_ADHOC:
1564                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1565                 ieee80211_ibss_setup_sdata(sdata);
1566                 break;
1567         case NL80211_IFTYPE_MESH_POINT:
1568                 if (ieee80211_vif_is_mesh(&sdata->vif))
1569                         ieee80211_mesh_init_sdata(sdata);
1570                 break;
1571         case NL80211_IFTYPE_MONITOR:
1572                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1573                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1574                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1575                                       MONITOR_FLAG_OTHER_BSS;
1576                 break;
1577         case NL80211_IFTYPE_WDS:
1578                 sdata->vif.bss_conf.bssid = NULL;
1579                 break;
1580         case NL80211_IFTYPE_NAN:
1581                 idr_init(&sdata->u.nan.function_inst_ids);
1582                 spin_lock_init(&sdata->u.nan.func_lock);
1583                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1584                 break;
1585         case NL80211_IFTYPE_AP_VLAN:
1586         case NL80211_IFTYPE_P2P_DEVICE:
1587                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1588                 break;
1589         case NL80211_IFTYPE_UNSPECIFIED:
1590         case NUM_NL80211_IFTYPES:
1591                 WARN_ON(1);
1592                 break;
1593         }
1594 
1595         ieee80211_debugfs_add_netdev(sdata);
1596 }
1597 
1598 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1599                                            enum nl80211_iftype type)
1600 {
1601         struct ieee80211_local *local = sdata->local;
1602         int ret, err;
1603         enum nl80211_iftype internal_type = type;
1604         bool p2p = false;
1605 
1606         ASSERT_RTNL();
1607 
1608         if (!local->ops->change_interface)
1609                 return -EBUSY;
1610 
1611         switch (sdata->vif.type) {
1612         case NL80211_IFTYPE_AP:
1613         case NL80211_IFTYPE_STATION:
1614         case NL80211_IFTYPE_ADHOC:
1615         case NL80211_IFTYPE_OCB:
1616                 /*
1617                  * Could maybe also all others here?
1618                  * Just not sure how that interacts
1619                  * with the RX/config path e.g. for
1620                  * mesh.
1621                  */
1622                 break;
1623         default:
1624                 return -EBUSY;
1625         }
1626 
1627         switch (type) {
1628         case NL80211_IFTYPE_AP:
1629         case NL80211_IFTYPE_STATION:
1630         case NL80211_IFTYPE_ADHOC:
1631         case NL80211_IFTYPE_OCB:
1632                 /*
1633                  * Could probably support everything
1634                  * but WDS here (WDS do_open can fail
1635                  * under memory pressure, which this
1636                  * code isn't prepared to handle).
1637                  */
1638                 break;
1639         case NL80211_IFTYPE_P2P_CLIENT:
1640                 p2p = true;
1641                 internal_type = NL80211_IFTYPE_STATION;
1642                 break;
1643         case NL80211_IFTYPE_P2P_GO:
1644                 p2p = true;
1645                 internal_type = NL80211_IFTYPE_AP;
1646                 break;
1647         default:
1648                 return -EBUSY;
1649         }
1650 
1651         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1652         if (ret)
1653                 return ret;
1654 
1655         ieee80211_do_stop(sdata, false);
1656 
1657         ieee80211_teardown_sdata(sdata);
1658 
1659         ieee80211_set_sdata_offload_flags(sdata);
1660         ret = drv_change_interface(local, sdata, internal_type, p2p);
1661         if (ret)
1662                 type = ieee80211_vif_type_p2p(&sdata->vif);
1663 
1664         /*
1665          * Ignore return value here, there's not much we can do since
1666          * the driver changed the interface type internally already.
1667          * The warnings will hopefully make driver authors fix it :-)
1668          */
1669         ieee80211_check_queues(sdata, type);
1670 
1671         ieee80211_setup_sdata(sdata, type);
1672         ieee80211_set_vif_encap_ops(sdata);
1673 
1674         err = ieee80211_do_open(&sdata->wdev, false);
1675         WARN(err, "type change: do_open returned %d", err);
1676 
1677         return ret;
1678 }
1679 
1680 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1681                              enum nl80211_iftype type)
1682 {
1683         int ret;
1684 
1685         ASSERT_RTNL();
1686 
1687         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1688                 return 0;
1689 
1690         if (ieee80211_sdata_running(sdata)) {
1691                 ret = ieee80211_runtime_change_iftype(sdata, type);
1692                 if (ret)
1693                         return ret;
1694         } else {
1695                 /* Purge and reset type-dependent state. */
1696                 ieee80211_teardown_sdata(sdata);
1697                 ieee80211_setup_sdata(sdata, type);
1698         }
1699 
1700         /* reset some values that shouldn't be kept across type changes */
1701         if (type == NL80211_IFTYPE_STATION)
1702                 sdata->u.mgd.use_4addr = false;
1703 
1704         return 0;
1705 }
1706 
1707 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1708                                        u8 *perm_addr, enum nl80211_iftype type)
1709 {
1710         struct ieee80211_sub_if_data *sdata;
1711         u64 mask, start, addr, val, inc;
1712         u8 *m;
1713         u8 tmp_addr[ETH_ALEN];
1714         int i;
1715 
1716         /* default ... something at least */
1717         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1718 
1719         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1720             local->hw.wiphy->n_addresses <= 1)
1721                 return;
1722 
1723         mutex_lock(&local->iflist_mtx);
1724 
1725         switch (type) {
1726         case NL80211_IFTYPE_MONITOR:
1727                 /* doesn't matter */
1728                 break;
1729         case NL80211_IFTYPE_WDS:
1730         case NL80211_IFTYPE_AP_VLAN:
1731                 /* match up with an AP interface */
1732                 list_for_each_entry(sdata, &local->interfaces, list) {
1733                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1734                                 continue;
1735                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1736                         break;
1737                 }
1738                 /* keep default if no AP interface present */
1739                 break;
1740         case NL80211_IFTYPE_P2P_CLIENT:
1741         case NL80211_IFTYPE_P2P_GO:
1742                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1743                         list_for_each_entry(sdata, &local->interfaces, list) {
1744                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1745                                         continue;
1746                                 if (!ieee80211_sdata_running(sdata))
1747                                         continue;
1748                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1749                                 goto out_unlock;
1750                         }
1751                 }
1752                 fallthrough;
1753         default:
1754                 /* assign a new address if possible -- try n_addresses first */
1755                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1756                         bool used = false;
1757 
1758                         list_for_each_entry(sdata, &local->interfaces, list) {
1759                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1760                                                      sdata->vif.addr)) {
1761                                         used = true;
1762                                         break;
1763                                 }
1764                         }
1765 
1766                         if (!used) {
1767                                 memcpy(perm_addr,
1768                                        local->hw.wiphy->addresses[i].addr,
1769                                        ETH_ALEN);
1770                                 break;
1771                         }
1772                 }
1773 
1774                 /* try mask if available */
1775                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1776                         break;
1777 
1778                 m = local->hw.wiphy->addr_mask;
1779                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1780                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1781                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1782 
1783                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1784                         /* not a contiguous mask ... not handled now! */
1785                         pr_info("not contiguous\n");
1786                         break;
1787                 }
1788 
1789                 /*
1790                  * Pick address of existing interface in case user changed
1791                  * MAC address manually, default to perm_addr.
1792                  */
1793                 m = local->hw.wiphy->perm_addr;
1794                 list_for_each_entry(sdata, &local->interfaces, list) {
1795                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1796                                 continue;
1797                         m = sdata->vif.addr;
1798                         break;
1799                 }
1800                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1801                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1802                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1803 
1804                 inc = 1ULL<<__ffs64(mask);
1805                 val = (start & mask);
1806                 addr = (start & ~mask) | (val & mask);
1807                 do {
1808                         bool used = false;
1809 
1810                         tmp_addr[5] = addr >> 0*8;
1811                         tmp_addr[4] = addr >> 1*8;
1812                         tmp_addr[3] = addr >> 2*8;
1813                         tmp_addr[2] = addr >> 3*8;
1814                         tmp_addr[1] = addr >> 4*8;
1815                         tmp_addr[0] = addr >> 5*8;
1816 
1817                         val += inc;
1818 
1819                         list_for_each_entry(sdata, &local->interfaces, list) {
1820                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1821                                         used = true;
1822                                         break;
1823                                 }
1824                         }
1825 
1826                         if (!used) {
1827                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1828                                 break;
1829                         }
1830                         addr = (start & ~mask) | (val & mask);
1831                 } while (addr != start);
1832 
1833                 break;
1834         }
1835 
1836  out_unlock:
1837         mutex_unlock(&local->iflist_mtx);
1838 }
1839 
1840 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1841                      unsigned char name_assign_type,
1842                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1843                      struct vif_params *params)
1844 {
1845         struct net_device *ndev = NULL;
1846         struct ieee80211_sub_if_data *sdata = NULL;
1847         struct txq_info *txqi;
1848         void (*if_setup)(struct net_device *dev);
1849         int ret, i;
1850         int txqs = 1;
1851 
1852         ASSERT_RTNL();
1853 
1854         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1855                 struct wireless_dev *wdev;
1856 
1857                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1858                                 GFP_KERNEL);
1859                 if (!sdata)
1860                         return -ENOMEM;
1861                 wdev = &sdata->wdev;
1862 
1863                 sdata->dev = NULL;
1864                 strlcpy(sdata->name, name, IFNAMSIZ);
1865                 ieee80211_assign_perm_addr(local, wdev->address, type);
1866                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1867         } else {
1868                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1869                                  sizeof(void *));
1870                 int txq_size = 0;
1871 
1872                 if (local->ops->wake_tx_queue &&
1873                     type != NL80211_IFTYPE_AP_VLAN &&
1874                     (type != NL80211_IFTYPE_MONITOR ||
1875                      (params->flags & MONITOR_FLAG_ACTIVE)))
1876                         txq_size += sizeof(struct txq_info) +
1877                                     local->hw.txq_data_size;
1878 
1879                 if (local->ops->wake_tx_queue) {
1880                         if_setup = ieee80211_if_setup_no_queue;
1881                 } else {
1882                         if_setup = ieee80211_if_setup;
1883                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1884                                 txqs = IEEE80211_NUM_ACS;
1885                 }
1886 
1887                 ndev = alloc_netdev_mqs(size + txq_size,
1888                                         name, name_assign_type,
1889                                         if_setup, txqs, 1);
1890                 if (!ndev)
1891                         return -ENOMEM;
1892 
1893                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1894                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1895 
1896                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1897 
1898                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1899                 if (!ndev->tstats) {
1900                         free_netdev(ndev);
1901                         return -ENOMEM;
1902                 }
1903 
1904                 ndev->needed_headroom = local->tx_headroom +
1905                                         4*6 /* four MAC addresses */
1906                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1907                                         + 6 /* mesh */
1908                                         + 8 /* rfc1042/bridge tunnel */
1909                                         - ETH_HLEN /* ethernet hard_header_len */
1910                                         + IEEE80211_ENCRYPT_HEADROOM;
1911                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1912 
1913                 ret = dev_alloc_name(ndev, ndev->name);
1914                 if (ret < 0) {
1915                         ieee80211_if_free(ndev);
1916                         free_netdev(ndev);
1917                         return ret;
1918                 }
1919 
1920                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1921                 if (is_valid_ether_addr(params->macaddr))
1922                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1923                 else
1924                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1925                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1926 
1927                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1928                 sdata = netdev_priv(ndev);
1929                 ndev->ieee80211_ptr = &sdata->wdev;
1930                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1931                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1932 
1933                 if (txq_size) {
1934                         txqi = netdev_priv(ndev) + size;
1935                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1936                 }
1937 
1938                 sdata->dev = ndev;
1939         }
1940 
1941         /* initialise type-independent data */
1942         sdata->wdev.wiphy = local->hw.wiphy;
1943         sdata->local = local;
1944 
1945         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1946                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1947 
1948         INIT_LIST_HEAD(&sdata->key_list);
1949 
1950         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1951                           ieee80211_dfs_cac_timer_work);
1952         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1953                           ieee80211_delayed_tailroom_dec);
1954 
1955         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1956                 struct ieee80211_supported_band *sband;
1957                 sband = local->hw.wiphy->bands[i];
1958                 sdata->rc_rateidx_mask[i] =
1959                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1960                 if (sband) {
1961                         __le16 cap;
1962                         u16 *vht_rate_mask;
1963 
1964                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1965                                sband->ht_cap.mcs.rx_mask,
1966                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1967 
1968                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1969                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1970                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1971                 } else {
1972                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1973                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1974                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1975                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1976                 }
1977         }
1978 
1979         ieee80211_set_default_queues(sdata);
1980 
1981         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1982         sdata->user_power_level = local->user_power_level;
1983 
1984         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1985 
1986         /* setup type-dependent data */
1987         ieee80211_setup_sdata(sdata, type);
1988 
1989         if (ndev) {
1990                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1991                 if (type == NL80211_IFTYPE_STATION)
1992                         sdata->u.mgd.use_4addr = params->use_4addr;
1993 
1994                 ndev->features |= local->hw.netdev_features;
1995                 ndev->hw_features |= ndev->features &
1996                                         MAC80211_SUPPORTED_FEATURES_TX;
1997 
1998                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1999 
2000                 /* MTU range: 256 - 2304 */
2001                 ndev->min_mtu = 256;
2002                 ndev->max_mtu = local->hw.max_mtu;
2003 
2004                 ret = register_netdevice(ndev);
2005                 if (ret) {
2006                         free_netdev(ndev);
2007                         return ret;
2008                 }
2009         }
2010 
2011         mutex_lock(&local->iflist_mtx);
2012         list_add_tail_rcu(&sdata->list, &local->interfaces);
2013         mutex_unlock(&local->iflist_mtx);
2014 
2015         if (new_wdev)
2016                 *new_wdev = &sdata->wdev;
2017 
2018         return 0;
2019 }
2020 
2021 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2022 {
2023         ASSERT_RTNL();
2024 
2025         mutex_lock(&sdata->local->iflist_mtx);
2026         list_del_rcu(&sdata->list);
2027         mutex_unlock(&sdata->local->iflist_mtx);
2028 
2029         if (sdata->vif.txq)
2030                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2031 
2032         synchronize_rcu();
2033 
2034         if (sdata->dev) {
2035                 unregister_netdevice(sdata->dev);
2036         } else {
2037                 cfg80211_unregister_wdev(&sdata->wdev);
2038                 ieee80211_teardown_sdata(sdata);
2039                 kfree(sdata);
2040         }
2041 }
2042 
2043 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2044 {
2045         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2046                 return;
2047         ieee80211_do_stop(sdata, true);
2048 }
2049 
2050 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2051 {
2052         struct ieee80211_sub_if_data *sdata, *tmp;
2053         LIST_HEAD(unreg_list);
2054         LIST_HEAD(wdev_list);
2055 
2056         ASSERT_RTNL();
2057 
2058         /* Before destroying the interfaces, make sure they're all stopped so
2059          * that the hardware is stopped. Otherwise, the driver might still be
2060          * iterating the interfaces during the shutdown, e.g. from a worker
2061          * or from RX processing or similar, and if it does so (using atomic
2062          * iteration) while we're manipulating the list, the iteration will
2063          * crash.
2064          *
2065          * After this, the hardware should be stopped and the driver should
2066          * have stopped all of its activities, so that we can do RCU-unaware
2067          * manipulations of the interface list below.
2068          */
2069         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2070 
2071         WARN(local->open_count, "%s: open count remains %d\n",
2072              wiphy_name(local->hw.wiphy), local->open_count);
2073 
2074         ieee80211_txq_teardown_flows(local);
2075 
2076         mutex_lock(&local->iflist_mtx);
2077         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2078                 list_del(&sdata->list);
2079 
2080                 if (sdata->dev)
2081                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2082                 else
2083                         list_add(&sdata->list, &wdev_list);
2084         }
2085         mutex_unlock(&local->iflist_mtx);
2086         unregister_netdevice_many(&unreg_list);
2087 
2088         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2089                 list_del(&sdata->list);
2090                 cfg80211_unregister_wdev(&sdata->wdev);
2091                 kfree(sdata);
2092         }
2093 }
2094 
2095 static int netdev_notify(struct notifier_block *nb,
2096                          unsigned long state, void *ptr)
2097 {
2098         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2099         struct ieee80211_sub_if_data *sdata;
2100 
2101         if (state != NETDEV_CHANGENAME)
2102                 return NOTIFY_DONE;
2103 
2104         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2105                 return NOTIFY_DONE;
2106 
2107         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2108                 return NOTIFY_DONE;
2109 
2110         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2111         memcpy(sdata->name, dev->name, IFNAMSIZ);
2112         ieee80211_debugfs_rename_netdev(sdata);
2113 
2114         return NOTIFY_OK;
2115 }
2116 
2117 static struct notifier_block mac80211_netdev_notifier = {
2118         .notifier_call = netdev_notify,
2119 };
2120 
2121 int ieee80211_iface_init(void)
2122 {
2123         return register_netdevice_notifier(&mac80211_netdev_notifier);
2124 }
2125 
2126 void ieee80211_iface_exit(void)
2127 {
2128         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2129 }
2130 
2131 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2132 {
2133         if (sdata->vif.type == NL80211_IFTYPE_AP)
2134                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2135         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2136                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2137 }
2138 
2139 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2140 {
2141         if (sdata->vif.type == NL80211_IFTYPE_AP)
2142                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2143         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2144                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2145 }
2146 

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