Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/net/mac80211/iface.c

  1 /*
  2  * Interface handling
  3  *
  4  * Copyright 2002-2005, Instant802 Networks, Inc.
  5  * Copyright 2005-2006, Devicescape Software, Inc.
  6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  8  * Copyright 2013-2014  Intel Mobile Communications GmbH
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  */
 14 #include <linux/slab.h>
 15 #include <linux/kernel.h>
 16 #include <linux/if_arp.h>
 17 #include <linux/netdevice.h>
 18 #include <linux/rtnetlink.h>
 19 #include <net/mac80211.h>
 20 #include <net/ieee80211_radiotap.h>
 21 #include "ieee80211_i.h"
 22 #include "sta_info.h"
 23 #include "debugfs_netdev.h"
 24 #include "mesh.h"
 25 #include "led.h"
 26 #include "driver-ops.h"
 27 #include "wme.h"
 28 #include "rate.h"
 29 
 30 /**
 31  * DOC: Interface list locking
 32  *
 33  * The interface list in each struct ieee80211_local is protected
 34  * three-fold:
 35  *
 36  * (1) modifications may only be done under the RTNL
 37  * (2) modifications and readers are protected against each other by
 38  *     the iflist_mtx.
 39  * (3) modifications are done in an RCU manner so atomic readers
 40  *     can traverse the list in RCU-safe blocks.
 41  *
 42  * As a consequence, reads (traversals) of the list can be protected
 43  * by either the RTNL, the iflist_mtx or RCU.
 44  */
 45 
 46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 47 {
 48         struct ieee80211_chanctx_conf *chanctx_conf;
 49         int power;
 50 
 51         rcu_read_lock();
 52         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 53         if (!chanctx_conf) {
 54                 rcu_read_unlock();
 55                 return false;
 56         }
 57 
 58         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 59         rcu_read_unlock();
 60 
 61         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 62                 power = min(power, sdata->user_power_level);
 63 
 64         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 65                 power = min(power, sdata->ap_power_level);
 66 
 67         if (power != sdata->vif.bss_conf.txpower) {
 68                 sdata->vif.bss_conf.txpower = power;
 69                 ieee80211_hw_config(sdata->local, 0);
 70                 return true;
 71         }
 72 
 73         return false;
 74 }
 75 
 76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 77                               bool update_bss)
 78 {
 79         if (__ieee80211_recalc_txpower(sdata) || update_bss)
 80                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 81 }
 82 
 83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 84 {
 85         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 86                 return 0;
 87 
 88         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 89         return IEEE80211_CONF_CHANGE_IDLE;
 90 }
 91 
 92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 93 {
 94         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 95                 return 0;
 96 
 97         ieee80211_flush_queues(local, NULL, false);
 98 
 99         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
100         return IEEE80211_CONF_CHANGE_IDLE;
101 }
102 
103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
104                                    bool force_active)
105 {
106         bool working, scanning, active;
107         unsigned int led_trig_start = 0, led_trig_stop = 0;
108 
109         lockdep_assert_held(&local->mtx);
110 
111         active = force_active ||
112                  !list_empty(&local->chanctx_list) ||
113                  local->monitors;
114 
115         working = !local->ops->remain_on_channel &&
116                   !list_empty(&local->roc_list);
117 
118         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
119                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
120 
121         if (working || scanning)
122                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123         else
124                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125 
126         if (active)
127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128         else
129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130 
131         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
132 
133         if (working || scanning || active)
134                 return __ieee80211_idle_off(local);
135         return __ieee80211_idle_on(local);
136 }
137 
138 u32 ieee80211_idle_off(struct ieee80211_local *local)
139 {
140         return __ieee80211_recalc_idle(local, true);
141 }
142 
143 void ieee80211_recalc_idle(struct ieee80211_local *local)
144 {
145         u32 change = __ieee80211_recalc_idle(local, false);
146         if (change)
147                 ieee80211_hw_config(local, change);
148 }
149 
150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
151 {
152         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
153                 return -EINVAL;
154 
155         dev->mtu = new_mtu;
156         return 0;
157 }
158 
159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
160                                 bool check_dup)
161 {
162         struct ieee80211_local *local = sdata->local;
163         struct ieee80211_sub_if_data *iter;
164         u64 new, mask, tmp;
165         u8 *m;
166         int ret = 0;
167 
168         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
169                 return 0;
170 
171         m = addr;
172         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175 
176         m = local->hw.wiphy->addr_mask;
177         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
178                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
179                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
180 
181         if (!check_dup)
182                 return ret;
183 
184         mutex_lock(&local->iflist_mtx);
185         list_for_each_entry(iter, &local->interfaces, list) {
186                 if (iter == sdata)
187                         continue;
188 
189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
190                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
191                         continue;
192 
193                 m = iter->vif.addr;
194                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
195                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
196                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
197 
198                 if ((new & ~mask) != (tmp & ~mask)) {
199                         ret = -EINVAL;
200                         break;
201                 }
202         }
203         mutex_unlock(&local->iflist_mtx);
204 
205         return ret;
206 }
207 
208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
209 {
210         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
211         struct sockaddr *sa = addr;
212         bool check_dup = true;
213         int ret;
214 
215         if (ieee80211_sdata_running(sdata))
216                 return -EBUSY;
217 
218         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
219             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
220                 check_dup = false;
221 
222         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
223         if (ret)
224                 return ret;
225 
226         ret = eth_mac_addr(dev, sa);
227 
228         if (ret == 0)
229                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
230 
231         return ret;
232 }
233 
234 static inline int identical_mac_addr_allowed(int type1, int type2)
235 {
236         return type1 == NL80211_IFTYPE_MONITOR ||
237                 type2 == NL80211_IFTYPE_MONITOR ||
238                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
239                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
241                 (type1 == NL80211_IFTYPE_WDS &&
242                         (type2 == NL80211_IFTYPE_WDS ||
243                          type2 == NL80211_IFTYPE_AP)) ||
244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
245                 (type1 == NL80211_IFTYPE_AP_VLAN &&
246                         (type2 == NL80211_IFTYPE_AP ||
247                          type2 == NL80211_IFTYPE_AP_VLAN));
248 }
249 
250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
251                                             enum nl80211_iftype iftype)
252 {
253         struct ieee80211_local *local = sdata->local;
254         struct ieee80211_sub_if_data *nsdata;
255         int ret;
256 
257         ASSERT_RTNL();
258 
259         /* we hold the RTNL here so can safely walk the list */
260         list_for_each_entry(nsdata, &local->interfaces, list) {
261                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
262                         /*
263                          * Only OCB and monitor mode may coexist
264                          */
265                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
266                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
267                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
268                              nsdata->vif.type == NL80211_IFTYPE_OCB))
269                                 return -EBUSY;
270 
271                         /*
272                          * Allow only a single IBSS interface to be up at any
273                          * time. This is restricted because beacon distribution
274                          * cannot work properly if both are in the same IBSS.
275                          *
276                          * To remove this restriction we'd have to disallow them
277                          * from setting the same SSID on different IBSS interfaces
278                          * belonging to the same hardware. Then, however, we're
279                          * faced with having to adopt two different TSF timers...
280                          */
281                         if (iftype == NL80211_IFTYPE_ADHOC &&
282                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
283                                 return -EBUSY;
284                         /*
285                          * will not add another interface while any channel
286                          * switch is active.
287                          */
288                         if (nsdata->vif.csa_active)
289                                 return -EBUSY;
290 
291                         /*
292                          * The remaining checks are only performed for interfaces
293                          * with the same MAC address.
294                          */
295                         if (!ether_addr_equal(sdata->vif.addr,
296                                               nsdata->vif.addr))
297                                 continue;
298 
299                         /*
300                          * check whether it may have the same address
301                          */
302                         if (!identical_mac_addr_allowed(iftype,
303                                                         nsdata->vif.type))
304                                 return -ENOTUNIQ;
305 
306                         /*
307                          * can only add VLANs to enabled APs
308                          */
309                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
310                             nsdata->vif.type == NL80211_IFTYPE_AP)
311                                 sdata->bss = &nsdata->u.ap;
312                 }
313         }
314 
315         mutex_lock(&local->chanctx_mtx);
316         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
317         mutex_unlock(&local->chanctx_mtx);
318         return ret;
319 }
320 
321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
322                                   enum nl80211_iftype iftype)
323 {
324         int n_queues = sdata->local->hw.queues;
325         int i;
326 
327         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
328                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
330                                          IEEE80211_INVAL_HW_QUEUE))
331                                 return -EINVAL;
332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
333                                          n_queues))
334                                 return -EINVAL;
335                 }
336         }
337 
338         if ((iftype != NL80211_IFTYPE_AP &&
339              iftype != NL80211_IFTYPE_P2P_GO &&
340              iftype != NL80211_IFTYPE_MESH_POINT) ||
341             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
342                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
343                 return 0;
344         }
345 
346         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
347                 return -EINVAL;
348 
349         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
350                 return -EINVAL;
351 
352         return 0;
353 }
354 
355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
356                                     const int offset)
357 {
358         struct ieee80211_local *local = sdata->local;
359         u32 flags = sdata->u.mntr_flags;
360 
361 #define ADJUST(_f, _s)  do {                                    \
362         if (flags & MONITOR_FLAG_##_f)                          \
363                 local->fif_##_s += offset;                      \
364         } while (0)
365 
366         ADJUST(FCSFAIL, fcsfail);
367         ADJUST(PLCPFAIL, plcpfail);
368         ADJUST(CONTROL, control);
369         ADJUST(CONTROL, pspoll);
370         ADJUST(OTHER_BSS, other_bss);
371 
372 #undef ADJUST
373 }
374 
375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
376 {
377         struct ieee80211_local *local = sdata->local;
378         int i;
379 
380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
381                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
382                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
383                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
384                         sdata->vif.hw_queue[i] = i;
385                 else
386                         sdata->vif.hw_queue[i] = 0;
387         }
388         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
389 }
390 
391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
392 {
393         struct ieee80211_sub_if_data *sdata;
394         int ret;
395 
396         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
397                 return 0;
398 
399         ASSERT_RTNL();
400 
401         if (local->monitor_sdata)
402                 return 0;
403 
404         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
405         if (!sdata)
406                 return -ENOMEM;
407 
408         /* set up data */
409         sdata->local = local;
410         sdata->vif.type = NL80211_IFTYPE_MONITOR;
411         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
412                  wiphy_name(local->hw.wiphy));
413         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
414 
415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
416 
417         ieee80211_set_default_queues(sdata);
418 
419         ret = drv_add_interface(local, sdata);
420         if (WARN_ON(ret)) {
421                 /* ok .. stupid driver, it asked for this! */
422                 kfree(sdata);
423                 return ret;
424         }
425 
426         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
427         if (ret) {
428                 kfree(sdata);
429                 return ret;
430         }
431 
432         mutex_lock(&local->iflist_mtx);
433         rcu_assign_pointer(local->monitor_sdata, sdata);
434         mutex_unlock(&local->iflist_mtx);
435 
436         mutex_lock(&local->mtx);
437         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
438                                         IEEE80211_CHANCTX_EXCLUSIVE);
439         mutex_unlock(&local->mtx);
440         if (ret) {
441                 mutex_lock(&local->iflist_mtx);
442                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
443                 mutex_unlock(&local->iflist_mtx);
444                 synchronize_net();
445                 drv_remove_interface(local, sdata);
446                 kfree(sdata);
447                 return ret;
448         }
449 
450         return 0;
451 }
452 
453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
454 {
455         struct ieee80211_sub_if_data *sdata;
456 
457         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
458                 return;
459 
460         ASSERT_RTNL();
461 
462         mutex_lock(&local->iflist_mtx);
463 
464         sdata = rcu_dereference_protected(local->monitor_sdata,
465                                           lockdep_is_held(&local->iflist_mtx));
466         if (!sdata) {
467                 mutex_unlock(&local->iflist_mtx);
468                 return;
469         }
470 
471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
472         mutex_unlock(&local->iflist_mtx);
473 
474         synchronize_net();
475 
476         mutex_lock(&local->mtx);
477         ieee80211_vif_release_channel(sdata);
478         mutex_unlock(&local->mtx);
479 
480         drv_remove_interface(local, sdata);
481 
482         kfree(sdata);
483 }
484 
485 /*
486  * NOTE: Be very careful when changing this function, it must NOT return
487  * an error on interface type changes that have been pre-checked, so most
488  * checks should be in ieee80211_check_concurrent_iface.
489  */
490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
491 {
492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
493         struct net_device *dev = wdev->netdev;
494         struct ieee80211_local *local = sdata->local;
495         struct sta_info *sta;
496         u32 changed = 0;
497         int res;
498         u32 hw_reconf_flags = 0;
499 
500         switch (sdata->vif.type) {
501         case NL80211_IFTYPE_WDS:
502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
503                         return -ENOLINK;
504                 break;
505         case NL80211_IFTYPE_AP_VLAN: {
506                 struct ieee80211_sub_if_data *master;
507 
508                 if (!sdata->bss)
509                         return -ENOLINK;
510 
511                 mutex_lock(&local->mtx);
512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
513                 mutex_unlock(&local->mtx);
514 
515                 master = container_of(sdata->bss,
516                                       struct ieee80211_sub_if_data, u.ap);
517                 sdata->control_port_protocol =
518                         master->control_port_protocol;
519                 sdata->control_port_no_encrypt =
520                         master->control_port_no_encrypt;
521                 sdata->vif.cab_queue = master->vif.cab_queue;
522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
523                        sizeof(sdata->vif.hw_queue));
524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
525 
526                 mutex_lock(&local->key_mtx);
527                 sdata->crypto_tx_tailroom_needed_cnt +=
528                         master->crypto_tx_tailroom_needed_cnt;
529                 mutex_unlock(&local->key_mtx);
530 
531                 break;
532                 }
533         case NL80211_IFTYPE_AP:
534                 sdata->bss = &sdata->u.ap;
535                 break;
536         case NL80211_IFTYPE_MESH_POINT:
537         case NL80211_IFTYPE_STATION:
538         case NL80211_IFTYPE_MONITOR:
539         case NL80211_IFTYPE_ADHOC:
540         case NL80211_IFTYPE_P2P_DEVICE:
541         case NL80211_IFTYPE_OCB:
542                 /* no special treatment */
543                 break;
544         case NL80211_IFTYPE_UNSPECIFIED:
545         case NUM_NL80211_IFTYPES:
546         case NL80211_IFTYPE_P2P_CLIENT:
547         case NL80211_IFTYPE_P2P_GO:
548                 /* cannot happen */
549                 WARN_ON(1);
550                 break;
551         }
552 
553         if (local->open_count == 0) {
554                 res = drv_start(local);
555                 if (res)
556                         goto err_del_bss;
557                 /* we're brought up, everything changes */
558                 hw_reconf_flags = ~0;
559                 ieee80211_led_radio(local, true);
560                 ieee80211_mod_tpt_led_trig(local,
561                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
562         }
563 
564         /*
565          * Copy the hopefully now-present MAC address to
566          * this interface, if it has the special null one.
567          */
568         if (dev && is_zero_ether_addr(dev->dev_addr)) {
569                 memcpy(dev->dev_addr,
570                        local->hw.wiphy->perm_addr,
571                        ETH_ALEN);
572                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
573 
574                 if (!is_valid_ether_addr(dev->dev_addr)) {
575                         res = -EADDRNOTAVAIL;
576                         goto err_stop;
577                 }
578         }
579 
580         switch (sdata->vif.type) {
581         case NL80211_IFTYPE_AP_VLAN:
582                 /* no need to tell driver, but set carrier and chanctx */
583                 if (rtnl_dereference(sdata->bss->beacon)) {
584                         ieee80211_vif_vlan_copy_chanctx(sdata);
585                         netif_carrier_on(dev);
586                 } else {
587                         netif_carrier_off(dev);
588                 }
589                 break;
590         case NL80211_IFTYPE_MONITOR:
591                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
592                         local->cooked_mntrs++;
593                         break;
594                 }
595 
596                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
597                         res = drv_add_interface(local, sdata);
598                         if (res)
599                                 goto err_stop;
600                 } else if (local->monitors == 0 && local->open_count == 0) {
601                         res = ieee80211_add_virtual_monitor(local);
602                         if (res)
603                                 goto err_stop;
604                 }
605 
606                 /* must be before the call to ieee80211_configure_filter */
607                 local->monitors++;
608                 if (local->monitors == 1) {
609                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
610                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
611                 }
612 
613                 ieee80211_adjust_monitor_flags(sdata, 1);
614                 ieee80211_configure_filter(local);
615                 mutex_lock(&local->mtx);
616                 ieee80211_recalc_idle(local);
617                 mutex_unlock(&local->mtx);
618 
619                 netif_carrier_on(dev);
620                 break;
621         default:
622                 if (coming_up) {
623                         ieee80211_del_virtual_monitor(local);
624 
625                         res = drv_add_interface(local, sdata);
626                         if (res)
627                                 goto err_stop;
628                         res = ieee80211_check_queues(sdata,
629                                 ieee80211_vif_type_p2p(&sdata->vif));
630                         if (res)
631                                 goto err_del_interface;
632                 }
633 
634                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
635                         local->fif_pspoll++;
636                         local->fif_probe_req++;
637 
638                         ieee80211_configure_filter(local);
639                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
640                         local->fif_probe_req++;
641                 }
642 
643                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
644                         changed |= ieee80211_reset_erp_info(sdata);
645                 ieee80211_bss_info_change_notify(sdata, changed);
646 
647                 switch (sdata->vif.type) {
648                 case NL80211_IFTYPE_STATION:
649                 case NL80211_IFTYPE_ADHOC:
650                 case NL80211_IFTYPE_AP:
651                 case NL80211_IFTYPE_MESH_POINT:
652                 case NL80211_IFTYPE_OCB:
653                         netif_carrier_off(dev);
654                         break;
655                 case NL80211_IFTYPE_WDS:
656                 case NL80211_IFTYPE_P2P_DEVICE:
657                         break;
658                 default:
659                         /* not reached */
660                         WARN_ON(1);
661                 }
662 
663                 /*
664                  * set default queue parameters so drivers don't
665                  * need to initialise the hardware if the hardware
666                  * doesn't start up with sane defaults
667                  */
668                 ieee80211_set_wmm_default(sdata, true);
669         }
670 
671         set_bit(SDATA_STATE_RUNNING, &sdata->state);
672 
673         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
674                 /* Create STA entry for the WDS peer */
675                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
676                                      GFP_KERNEL);
677                 if (!sta) {
678                         res = -ENOMEM;
679                         goto err_del_interface;
680                 }
681 
682                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
683                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
684                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
685 
686                 res = sta_info_insert(sta);
687                 if (res) {
688                         /* STA has been freed */
689                         goto err_del_interface;
690                 }
691 
692                 rate_control_rate_init(sta);
693                 netif_carrier_on(dev);
694         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
695                 rcu_assign_pointer(local->p2p_sdata, sdata);
696         }
697 
698         /*
699          * set_multicast_list will be invoked by the networking core
700          * which will check whether any increments here were done in
701          * error and sync them down to the hardware as filter flags.
702          */
703         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
704                 atomic_inc(&local->iff_allmultis);
705 
706         if (sdata->flags & IEEE80211_SDATA_PROMISC)
707                 atomic_inc(&local->iff_promiscs);
708 
709         if (coming_up)
710                 local->open_count++;
711 
712         if (hw_reconf_flags)
713                 ieee80211_hw_config(local, hw_reconf_flags);
714 
715         ieee80211_recalc_ps(local, -1);
716 
717         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
718             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
719                 /* XXX: for AP_VLAN, actually track AP queues */
720                 netif_tx_start_all_queues(dev);
721         } else if (dev) {
722                 unsigned long flags;
723                 int n_acs = IEEE80211_NUM_ACS;
724                 int ac;
725 
726                 if (local->hw.queues < IEEE80211_NUM_ACS)
727                         n_acs = 1;
728 
729                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
730                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
731                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
732                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
733                         for (ac = 0; ac < n_acs; ac++) {
734                                 int ac_queue = sdata->vif.hw_queue[ac];
735 
736                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
737                                     skb_queue_empty(&local->pending[ac_queue]))
738                                         netif_start_subqueue(dev, ac);
739                         }
740                 }
741                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
742         }
743 
744         return 0;
745  err_del_interface:
746         drv_remove_interface(local, sdata);
747  err_stop:
748         if (!local->open_count)
749                 drv_stop(local);
750  err_del_bss:
751         sdata->bss = NULL;
752         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
753                 mutex_lock(&local->mtx);
754                 list_del(&sdata->u.vlan.list);
755                 mutex_unlock(&local->mtx);
756         }
757         /* might already be clear but that doesn't matter */
758         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
759         return res;
760 }
761 
762 static int ieee80211_open(struct net_device *dev)
763 {
764         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
765         int err;
766 
767         /* fail early if user set an invalid address */
768         if (!is_valid_ether_addr(dev->dev_addr))
769                 return -EADDRNOTAVAIL;
770 
771         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
772         if (err)
773                 return err;
774 
775         return ieee80211_do_open(&sdata->wdev, true);
776 }
777 
778 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
779                               bool going_down)
780 {
781         struct ieee80211_local *local = sdata->local;
782         unsigned long flags;
783         struct sk_buff *skb, *tmp;
784         u32 hw_reconf_flags = 0;
785         int i, flushed;
786         struct ps_data *ps;
787         struct cfg80211_chan_def chandef;
788         bool cancel_scan;
789 
790         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
791 
792         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
793         if (cancel_scan)
794                 ieee80211_scan_cancel(local);
795 
796         /*
797          * Stop TX on this interface first.
798          */
799         if (sdata->dev)
800                 netif_tx_stop_all_queues(sdata->dev);
801 
802         ieee80211_roc_purge(local, sdata);
803 
804         switch (sdata->vif.type) {
805         case NL80211_IFTYPE_STATION:
806                 ieee80211_mgd_stop(sdata);
807                 break;
808         case NL80211_IFTYPE_ADHOC:
809                 ieee80211_ibss_stop(sdata);
810                 break;
811         case NL80211_IFTYPE_AP:
812                 cancel_work_sync(&sdata->u.ap.request_smps_work);
813                 break;
814         default:
815                 break;
816         }
817 
818         /*
819          * Remove all stations associated with this interface.
820          *
821          * This must be done before calling ops->remove_interface()
822          * because otherwise we can later invoke ops->sta_notify()
823          * whenever the STAs are removed, and that invalidates driver
824          * assumptions about always getting a vif pointer that is valid
825          * (because if we remove a STA after ops->remove_interface()
826          * the driver will have removed the vif info already!)
827          *
828          * In WDS mode a station must exist here and be flushed, for
829          * AP_VLANs stations may exist since there's nothing else that
830          * would have removed them, but in other modes there shouldn't
831          * be any stations.
832          */
833         flushed = sta_info_flush(sdata);
834         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
835                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
836                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
837 
838         /* don't count this interface for promisc/allmulti while it is down */
839         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
840                 atomic_dec(&local->iff_allmultis);
841 
842         if (sdata->flags & IEEE80211_SDATA_PROMISC)
843                 atomic_dec(&local->iff_promiscs);
844 
845         if (sdata->vif.type == NL80211_IFTYPE_AP) {
846                 local->fif_pspoll--;
847                 local->fif_probe_req--;
848         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
849                 local->fif_probe_req--;
850         }
851 
852         if (sdata->dev) {
853                 netif_addr_lock_bh(sdata->dev);
854                 spin_lock_bh(&local->filter_lock);
855                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
856                                  sdata->dev->addr_len);
857                 spin_unlock_bh(&local->filter_lock);
858                 netif_addr_unlock_bh(sdata->dev);
859         }
860 
861         del_timer_sync(&local->dynamic_ps_timer);
862         cancel_work_sync(&local->dynamic_ps_enable_work);
863 
864         cancel_work_sync(&sdata->recalc_smps);
865         sdata_lock(sdata);
866         mutex_lock(&local->mtx);
867         sdata->vif.csa_active = false;
868         if (sdata->vif.type == NL80211_IFTYPE_STATION)
869                 sdata->u.mgd.csa_waiting_bcn = false;
870         if (sdata->csa_block_tx) {
871                 ieee80211_wake_vif_queues(local, sdata,
872                                           IEEE80211_QUEUE_STOP_REASON_CSA);
873                 sdata->csa_block_tx = false;
874         }
875         mutex_unlock(&local->mtx);
876         sdata_unlock(sdata);
877 
878         cancel_work_sync(&sdata->csa_finalize_work);
879 
880         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
881 
882         if (sdata->wdev.cac_started) {
883                 chandef = sdata->vif.bss_conf.chandef;
884                 WARN_ON(local->suspended);
885                 mutex_lock(&local->mtx);
886                 ieee80211_vif_release_channel(sdata);
887                 mutex_unlock(&local->mtx);
888                 cfg80211_cac_event(sdata->dev, &chandef,
889                                    NL80211_RADAR_CAC_ABORTED,
890                                    GFP_KERNEL);
891         }
892 
893         /* APs need special treatment */
894         if (sdata->vif.type == NL80211_IFTYPE_AP) {
895                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
896 
897                 /* down all dependent devices, that is VLANs */
898                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
899                                          u.vlan.list)
900                         dev_close(vlan->dev);
901                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
902         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
903                 /* remove all packets in parent bc_buf pointing to this dev */
904                 ps = &sdata->bss->ps;
905 
906                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
907                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
908                         if (skb->dev == sdata->dev) {
909                                 __skb_unlink(skb, &ps->bc_buf);
910                                 local->total_ps_buffered--;
911                                 ieee80211_free_txskb(&local->hw, skb);
912                         }
913                 }
914                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
915         }
916 
917         if (going_down)
918                 local->open_count--;
919 
920         switch (sdata->vif.type) {
921         case NL80211_IFTYPE_AP_VLAN:
922                 mutex_lock(&local->mtx);
923                 list_del(&sdata->u.vlan.list);
924                 mutex_unlock(&local->mtx);
925                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
926                 /* see comment in the default case below */
927                 ieee80211_free_keys(sdata, true);
928                 /* no need to tell driver */
929                 break;
930         case NL80211_IFTYPE_MONITOR:
931                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
932                         local->cooked_mntrs--;
933                         break;
934                 }
935 
936                 local->monitors--;
937                 if (local->monitors == 0) {
938                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
939                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
940                 }
941 
942                 ieee80211_adjust_monitor_flags(sdata, -1);
943                 break;
944         case NL80211_IFTYPE_P2P_DEVICE:
945                 /* relies on synchronize_rcu() below */
946                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
947                 /* fall through */
948         default:
949                 cancel_work_sync(&sdata->work);
950                 /*
951                  * When we get here, the interface is marked down.
952                  * Free the remaining keys, if there are any
953                  * (which can happen in AP mode if userspace sets
954                  * keys before the interface is operating, and maybe
955                  * also in WDS mode)
956                  *
957                  * Force the key freeing to always synchronize_net()
958                  * to wait for the RX path in case it is using this
959                  * interface enqueuing frames at this very time on
960                  * another CPU.
961                  */
962                 ieee80211_free_keys(sdata, true);
963                 skb_queue_purge(&sdata->skb_queue);
964         }
965 
966         sdata->bss = NULL;
967 
968         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
969         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
970                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
971                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
972                         if (info->control.vif == &sdata->vif) {
973                                 __skb_unlink(skb, &local->pending[i]);
974                                 ieee80211_free_txskb(&local->hw, skb);
975                         }
976                 }
977         }
978         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
979 
980         if (sdata->vif.txq) {
981                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
982 
983                 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
984                 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
985         }
986 
987         if (local->open_count == 0)
988                 ieee80211_clear_tx_pending(local);
989 
990         /*
991          * If the interface goes down while suspended, presumably because
992          * the device was unplugged and that happens before our resume,
993          * then the driver is already unconfigured and the remainder of
994          * this function isn't needed.
995          * XXX: what about WoWLAN? If the device has software state, e.g.
996          *      memory allocated, it might expect teardown commands from
997          *      mac80211 here?
998          */
999         if (local->suspended) {
1000                 WARN_ON(local->wowlan);
1001                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1002                 return;
1003         }
1004 
1005         switch (sdata->vif.type) {
1006         case NL80211_IFTYPE_AP_VLAN:
1007                 break;
1008         case NL80211_IFTYPE_MONITOR:
1009                 if (local->monitors == 0)
1010                         ieee80211_del_virtual_monitor(local);
1011 
1012                 mutex_lock(&local->mtx);
1013                 ieee80211_recalc_idle(local);
1014                 mutex_unlock(&local->mtx);
1015 
1016                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1017                         break;
1018 
1019                 /* fall through */
1020         default:
1021                 if (going_down)
1022                         drv_remove_interface(local, sdata);
1023         }
1024 
1025         ieee80211_recalc_ps(local, -1);
1026 
1027         if (cancel_scan)
1028                 flush_delayed_work(&local->scan_work);
1029 
1030         if (local->open_count == 0) {
1031                 ieee80211_stop_device(local);
1032 
1033                 /* no reconfiguring after stop! */
1034                 return;
1035         }
1036 
1037         /* do after stop to avoid reconfiguring when we stop anyway */
1038         ieee80211_configure_filter(local);
1039         ieee80211_hw_config(local, hw_reconf_flags);
1040 
1041         if (local->monitors == local->open_count)
1042                 ieee80211_add_virtual_monitor(local);
1043 }
1044 
1045 static int ieee80211_stop(struct net_device *dev)
1046 {
1047         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1048 
1049         ieee80211_do_stop(sdata, true);
1050 
1051         return 0;
1052 }
1053 
1054 static void ieee80211_set_multicast_list(struct net_device *dev)
1055 {
1056         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1057         struct ieee80211_local *local = sdata->local;
1058         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1059 
1060         allmulti = !!(dev->flags & IFF_ALLMULTI);
1061         promisc = !!(dev->flags & IFF_PROMISC);
1062         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1063         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1064 
1065         if (allmulti != sdata_allmulti) {
1066                 if (dev->flags & IFF_ALLMULTI)
1067                         atomic_inc(&local->iff_allmultis);
1068                 else
1069                         atomic_dec(&local->iff_allmultis);
1070                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1071         }
1072 
1073         if (promisc != sdata_promisc) {
1074                 if (dev->flags & IFF_PROMISC)
1075                         atomic_inc(&local->iff_promiscs);
1076                 else
1077                         atomic_dec(&local->iff_promiscs);
1078                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1079         }
1080         spin_lock_bh(&local->filter_lock);
1081         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1082         spin_unlock_bh(&local->filter_lock);
1083         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1084 }
1085 
1086 /*
1087  * Called when the netdev is removed or, by the code below, before
1088  * the interface type changes.
1089  */
1090 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1091 {
1092         int i;
1093 
1094         /* free extra data */
1095         ieee80211_free_keys(sdata, false);
1096 
1097         ieee80211_debugfs_remove_netdev(sdata);
1098 
1099         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1100                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1101         sdata->fragment_next = 0;
1102 
1103         if (ieee80211_vif_is_mesh(&sdata->vif))
1104                 mesh_rmc_free(sdata);
1105 }
1106 
1107 static void ieee80211_uninit(struct net_device *dev)
1108 {
1109         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1110 }
1111 
1112 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1113                                          struct sk_buff *skb,
1114                                          void *accel_priv,
1115                                          select_queue_fallback_t fallback)
1116 {
1117         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1118 }
1119 
1120 static const struct net_device_ops ieee80211_dataif_ops = {
1121         .ndo_open               = ieee80211_open,
1122         .ndo_stop               = ieee80211_stop,
1123         .ndo_uninit             = ieee80211_uninit,
1124         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1125         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1126         .ndo_change_mtu         = ieee80211_change_mtu,
1127         .ndo_set_mac_address    = ieee80211_change_mac,
1128         .ndo_select_queue       = ieee80211_netdev_select_queue,
1129 };
1130 
1131 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1132                                           struct sk_buff *skb,
1133                                           void *accel_priv,
1134                                           select_queue_fallback_t fallback)
1135 {
1136         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1137         struct ieee80211_local *local = sdata->local;
1138         struct ieee80211_hdr *hdr;
1139         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1140 
1141         if (local->hw.queues < IEEE80211_NUM_ACS)
1142                 return 0;
1143 
1144         if (skb->len < 4 ||
1145             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1146                 return 0; /* doesn't matter, frame will be dropped */
1147 
1148         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1149 
1150         return ieee80211_select_queue_80211(sdata, skb, hdr);
1151 }
1152 
1153 static const struct net_device_ops ieee80211_monitorif_ops = {
1154         .ndo_open               = ieee80211_open,
1155         .ndo_stop               = ieee80211_stop,
1156         .ndo_uninit             = ieee80211_uninit,
1157         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1158         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1159         .ndo_change_mtu         = ieee80211_change_mtu,
1160         .ndo_set_mac_address    = ieee80211_change_mac,
1161         .ndo_select_queue       = ieee80211_monitor_select_queue,
1162 };
1163 
1164 static void ieee80211_if_setup(struct net_device *dev)
1165 {
1166         ether_setup(dev);
1167         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1168         dev->netdev_ops = &ieee80211_dataif_ops;
1169         dev->destructor = free_netdev;
1170 }
1171 
1172 static void ieee80211_iface_work(struct work_struct *work)
1173 {
1174         struct ieee80211_sub_if_data *sdata =
1175                 container_of(work, struct ieee80211_sub_if_data, work);
1176         struct ieee80211_local *local = sdata->local;
1177         struct sk_buff *skb;
1178         struct sta_info *sta;
1179         struct ieee80211_ra_tid *ra_tid;
1180         struct ieee80211_rx_agg *rx_agg;
1181 
1182         if (!ieee80211_sdata_running(sdata))
1183                 return;
1184 
1185         if (local->scanning)
1186                 return;
1187 
1188         if (!ieee80211_can_run_worker(local))
1189                 return;
1190 
1191         /* first process frames */
1192         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1193                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1194 
1195                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1196                         ra_tid = (void *)&skb->cb;
1197                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1198                                                  ra_tid->tid);
1199                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1200                         ra_tid = (void *)&skb->cb;
1201                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1202                                                 ra_tid->tid);
1203                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1204                         rx_agg = (void *)&skb->cb;
1205                         mutex_lock(&local->sta_mtx);
1206                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1207                         if (sta)
1208                                 __ieee80211_start_rx_ba_session(sta,
1209                                                 0, 0, 0, 1, rx_agg->tid,
1210                                                 IEEE80211_MAX_AMPDU_BUF,
1211                                                 false, true);
1212                         mutex_unlock(&local->sta_mtx);
1213                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1214                         rx_agg = (void *)&skb->cb;
1215                         mutex_lock(&local->sta_mtx);
1216                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1217                         if (sta)
1218                                 __ieee80211_stop_rx_ba_session(sta,
1219                                                         rx_agg->tid,
1220                                                         WLAN_BACK_RECIPIENT, 0,
1221                                                         false);
1222                         mutex_unlock(&local->sta_mtx);
1223                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1224                         ieee80211_process_tdls_channel_switch(sdata, skb);
1225                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1226                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1227                         int len = skb->len;
1228 
1229                         mutex_lock(&local->sta_mtx);
1230                         sta = sta_info_get_bss(sdata, mgmt->sa);
1231                         if (sta) {
1232                                 switch (mgmt->u.action.u.addba_req.action_code) {
1233                                 case WLAN_ACTION_ADDBA_REQ:
1234                                         ieee80211_process_addba_request(
1235                                                         local, sta, mgmt, len);
1236                                         break;
1237                                 case WLAN_ACTION_ADDBA_RESP:
1238                                         ieee80211_process_addba_resp(local, sta,
1239                                                                      mgmt, len);
1240                                         break;
1241                                 case WLAN_ACTION_DELBA:
1242                                         ieee80211_process_delba(sdata, sta,
1243                                                                 mgmt, len);
1244                                         break;
1245                                 default:
1246                                         WARN_ON(1);
1247                                         break;
1248                                 }
1249                         }
1250                         mutex_unlock(&local->sta_mtx);
1251                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1252                         struct ieee80211_hdr *hdr = (void *)mgmt;
1253                         /*
1254                          * So the frame isn't mgmt, but frame_control
1255                          * is at the right place anyway, of course, so
1256                          * the if statement is correct.
1257                          *
1258                          * Warn if we have other data frame types here,
1259                          * they must not get here.
1260                          */
1261                         WARN_ON(hdr->frame_control &
1262                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1263                         WARN_ON(!(hdr->seq_ctrl &
1264                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1265                         /*
1266                          * This was a fragment of a frame, received while
1267                          * a block-ack session was active. That cannot be
1268                          * right, so terminate the session.
1269                          */
1270                         mutex_lock(&local->sta_mtx);
1271                         sta = sta_info_get_bss(sdata, mgmt->sa);
1272                         if (sta) {
1273                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1274                                                 IEEE80211_QOS_CTL_TID_MASK;
1275 
1276                                 __ieee80211_stop_rx_ba_session(
1277                                         sta, tid, WLAN_BACK_RECIPIENT,
1278                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1279                                         true);
1280                         }
1281                         mutex_unlock(&local->sta_mtx);
1282                 } else switch (sdata->vif.type) {
1283                 case NL80211_IFTYPE_STATION:
1284                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1285                         break;
1286                 case NL80211_IFTYPE_ADHOC:
1287                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1288                         break;
1289                 case NL80211_IFTYPE_MESH_POINT:
1290                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1291                                 break;
1292                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1293                         break;
1294                 default:
1295                         WARN(1, "frame for unexpected interface type");
1296                         break;
1297                 }
1298 
1299                 kfree_skb(skb);
1300         }
1301 
1302         /* then other type-dependent work */
1303         switch (sdata->vif.type) {
1304         case NL80211_IFTYPE_STATION:
1305                 ieee80211_sta_work(sdata);
1306                 break;
1307         case NL80211_IFTYPE_ADHOC:
1308                 ieee80211_ibss_work(sdata);
1309                 break;
1310         case NL80211_IFTYPE_MESH_POINT:
1311                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1312                         break;
1313                 ieee80211_mesh_work(sdata);
1314                 break;
1315         case NL80211_IFTYPE_OCB:
1316                 ieee80211_ocb_work(sdata);
1317                 break;
1318         default:
1319                 break;
1320         }
1321 }
1322 
1323 static void ieee80211_recalc_smps_work(struct work_struct *work)
1324 {
1325         struct ieee80211_sub_if_data *sdata =
1326                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1327 
1328         ieee80211_recalc_smps(sdata);
1329 }
1330 
1331 /*
1332  * Helper function to initialise an interface to a specific type.
1333  */
1334 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1335                                   enum nl80211_iftype type)
1336 {
1337         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1338                                                     0xff, 0xff, 0xff};
1339 
1340         /* clear type-dependent union */
1341         memset(&sdata->u, 0, sizeof(sdata->u));
1342 
1343         /* and set some type-dependent values */
1344         sdata->vif.type = type;
1345         sdata->vif.p2p = false;
1346         sdata->wdev.iftype = type;
1347 
1348         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1349         sdata->control_port_no_encrypt = false;
1350         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1351         sdata->vif.bss_conf.idle = true;
1352 
1353         sdata->noack_map = 0;
1354 
1355         /* only monitor/p2p-device differ */
1356         if (sdata->dev) {
1357                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1358                 sdata->dev->type = ARPHRD_ETHER;
1359         }
1360 
1361         skb_queue_head_init(&sdata->skb_queue);
1362         INIT_WORK(&sdata->work, ieee80211_iface_work);
1363         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1364         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1365         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1366         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1367 
1368         switch (type) {
1369         case NL80211_IFTYPE_P2P_GO:
1370                 type = NL80211_IFTYPE_AP;
1371                 sdata->vif.type = type;
1372                 sdata->vif.p2p = true;
1373                 /* fall through */
1374         case NL80211_IFTYPE_AP:
1375                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1376                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1377                 INIT_WORK(&sdata->u.ap.request_smps_work,
1378                           ieee80211_request_smps_ap_work);
1379                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1380                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1381                 break;
1382         case NL80211_IFTYPE_P2P_CLIENT:
1383                 type = NL80211_IFTYPE_STATION;
1384                 sdata->vif.type = type;
1385                 sdata->vif.p2p = true;
1386                 /* fall through */
1387         case NL80211_IFTYPE_STATION:
1388                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1389                 ieee80211_sta_setup_sdata(sdata);
1390                 break;
1391         case NL80211_IFTYPE_OCB:
1392                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1393                 ieee80211_ocb_setup_sdata(sdata);
1394                 break;
1395         case NL80211_IFTYPE_ADHOC:
1396                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1397                 ieee80211_ibss_setup_sdata(sdata);
1398                 break;
1399         case NL80211_IFTYPE_MESH_POINT:
1400                 if (ieee80211_vif_is_mesh(&sdata->vif))
1401                         ieee80211_mesh_init_sdata(sdata);
1402                 break;
1403         case NL80211_IFTYPE_MONITOR:
1404                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1405                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1406                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1407                                       MONITOR_FLAG_OTHER_BSS;
1408                 break;
1409         case NL80211_IFTYPE_WDS:
1410                 sdata->vif.bss_conf.bssid = NULL;
1411                 break;
1412         case NL80211_IFTYPE_AP_VLAN:
1413         case NL80211_IFTYPE_P2P_DEVICE:
1414                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1415                 break;
1416         case NL80211_IFTYPE_UNSPECIFIED:
1417         case NUM_NL80211_IFTYPES:
1418                 BUG();
1419                 break;
1420         }
1421 
1422         ieee80211_debugfs_add_netdev(sdata);
1423 }
1424 
1425 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1426                                            enum nl80211_iftype type)
1427 {
1428         struct ieee80211_local *local = sdata->local;
1429         int ret, err;
1430         enum nl80211_iftype internal_type = type;
1431         bool p2p = false;
1432 
1433         ASSERT_RTNL();
1434 
1435         if (!local->ops->change_interface)
1436                 return -EBUSY;
1437 
1438         switch (sdata->vif.type) {
1439         case NL80211_IFTYPE_AP:
1440         case NL80211_IFTYPE_STATION:
1441         case NL80211_IFTYPE_ADHOC:
1442         case NL80211_IFTYPE_OCB:
1443                 /*
1444                  * Could maybe also all others here?
1445                  * Just not sure how that interacts
1446                  * with the RX/config path e.g. for
1447                  * mesh.
1448                  */
1449                 break;
1450         default:
1451                 return -EBUSY;
1452         }
1453 
1454         switch (type) {
1455         case NL80211_IFTYPE_AP:
1456         case NL80211_IFTYPE_STATION:
1457         case NL80211_IFTYPE_ADHOC:
1458         case NL80211_IFTYPE_OCB:
1459                 /*
1460                  * Could probably support everything
1461                  * but WDS here (WDS do_open can fail
1462                  * under memory pressure, which this
1463                  * code isn't prepared to handle).
1464                  */
1465                 break;
1466         case NL80211_IFTYPE_P2P_CLIENT:
1467                 p2p = true;
1468                 internal_type = NL80211_IFTYPE_STATION;
1469                 break;
1470         case NL80211_IFTYPE_P2P_GO:
1471                 p2p = true;
1472                 internal_type = NL80211_IFTYPE_AP;
1473                 break;
1474         default:
1475                 return -EBUSY;
1476         }
1477 
1478         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1479         if (ret)
1480                 return ret;
1481 
1482         ieee80211_do_stop(sdata, false);
1483 
1484         ieee80211_teardown_sdata(sdata);
1485 
1486         ret = drv_change_interface(local, sdata, internal_type, p2p);
1487         if (ret)
1488                 type = ieee80211_vif_type_p2p(&sdata->vif);
1489 
1490         /*
1491          * Ignore return value here, there's not much we can do since
1492          * the driver changed the interface type internally already.
1493          * The warnings will hopefully make driver authors fix it :-)
1494          */
1495         ieee80211_check_queues(sdata, type);
1496 
1497         ieee80211_setup_sdata(sdata, type);
1498 
1499         err = ieee80211_do_open(&sdata->wdev, false);
1500         WARN(err, "type change: do_open returned %d", err);
1501 
1502         return ret;
1503 }
1504 
1505 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1506                              enum nl80211_iftype type)
1507 {
1508         int ret;
1509 
1510         ASSERT_RTNL();
1511 
1512         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1513                 return 0;
1514 
1515         if (ieee80211_sdata_running(sdata)) {
1516                 ret = ieee80211_runtime_change_iftype(sdata, type);
1517                 if (ret)
1518                         return ret;
1519         } else {
1520                 /* Purge and reset type-dependent state. */
1521                 ieee80211_teardown_sdata(sdata);
1522                 ieee80211_setup_sdata(sdata, type);
1523         }
1524 
1525         /* reset some values that shouldn't be kept across type changes */
1526         if (type == NL80211_IFTYPE_STATION)
1527                 sdata->u.mgd.use_4addr = false;
1528 
1529         return 0;
1530 }
1531 
1532 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1533                                        u8 *perm_addr, enum nl80211_iftype type)
1534 {
1535         struct ieee80211_sub_if_data *sdata;
1536         u64 mask, start, addr, val, inc;
1537         u8 *m;
1538         u8 tmp_addr[ETH_ALEN];
1539         int i;
1540 
1541         /* default ... something at least */
1542         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1543 
1544         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1545             local->hw.wiphy->n_addresses <= 1)
1546                 return;
1547 
1548         mutex_lock(&local->iflist_mtx);
1549 
1550         switch (type) {
1551         case NL80211_IFTYPE_MONITOR:
1552                 /* doesn't matter */
1553                 break;
1554         case NL80211_IFTYPE_WDS:
1555         case NL80211_IFTYPE_AP_VLAN:
1556                 /* match up with an AP interface */
1557                 list_for_each_entry(sdata, &local->interfaces, list) {
1558                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1559                                 continue;
1560                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1561                         break;
1562                 }
1563                 /* keep default if no AP interface present */
1564                 break;
1565         case NL80211_IFTYPE_P2P_CLIENT:
1566         case NL80211_IFTYPE_P2P_GO:
1567                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1568                         list_for_each_entry(sdata, &local->interfaces, list) {
1569                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1570                                         continue;
1571                                 if (!ieee80211_sdata_running(sdata))
1572                                         continue;
1573                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1574                                 goto out_unlock;
1575                         }
1576                 }
1577                 /* otherwise fall through */
1578         default:
1579                 /* assign a new address if possible -- try n_addresses first */
1580                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1581                         bool used = false;
1582 
1583                         list_for_each_entry(sdata, &local->interfaces, list) {
1584                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1585                                                      sdata->vif.addr)) {
1586                                         used = true;
1587                                         break;
1588                                 }
1589                         }
1590 
1591                         if (!used) {
1592                                 memcpy(perm_addr,
1593                                        local->hw.wiphy->addresses[i].addr,
1594                                        ETH_ALEN);
1595                                 break;
1596                         }
1597                 }
1598 
1599                 /* try mask if available */
1600                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1601                         break;
1602 
1603                 m = local->hw.wiphy->addr_mask;
1604                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1605                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1606                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1607 
1608                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1609                         /* not a contiguous mask ... not handled now! */
1610                         pr_info("not contiguous\n");
1611                         break;
1612                 }
1613 
1614                 /*
1615                  * Pick address of existing interface in case user changed
1616                  * MAC address manually, default to perm_addr.
1617                  */
1618                 m = local->hw.wiphy->perm_addr;
1619                 list_for_each_entry(sdata, &local->interfaces, list) {
1620                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1621                                 continue;
1622                         m = sdata->vif.addr;
1623                         break;
1624                 }
1625                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1626                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1627                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1628 
1629                 inc = 1ULL<<__ffs64(mask);
1630                 val = (start & mask);
1631                 addr = (start & ~mask) | (val & mask);
1632                 do {
1633                         bool used = false;
1634 
1635                         tmp_addr[5] = addr >> 0*8;
1636                         tmp_addr[4] = addr >> 1*8;
1637                         tmp_addr[3] = addr >> 2*8;
1638                         tmp_addr[2] = addr >> 3*8;
1639                         tmp_addr[1] = addr >> 4*8;
1640                         tmp_addr[0] = addr >> 5*8;
1641 
1642                         val += inc;
1643 
1644                         list_for_each_entry(sdata, &local->interfaces, list) {
1645                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1646                                         used = true;
1647                                         break;
1648                                 }
1649                         }
1650 
1651                         if (!used) {
1652                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1653                                 break;
1654                         }
1655                         addr = (start & ~mask) | (val & mask);
1656                 } while (addr != start);
1657 
1658                 break;
1659         }
1660 
1661  out_unlock:
1662         mutex_unlock(&local->iflist_mtx);
1663 }
1664 
1665 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1666                      unsigned char name_assign_type,
1667                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1668                      struct vif_params *params)
1669 {
1670         struct net_device *ndev = NULL;
1671         struct ieee80211_sub_if_data *sdata = NULL;
1672         struct txq_info *txqi;
1673         int ret, i;
1674         int txqs = 1;
1675 
1676         ASSERT_RTNL();
1677 
1678         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1679                 struct wireless_dev *wdev;
1680 
1681                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1682                                 GFP_KERNEL);
1683                 if (!sdata)
1684                         return -ENOMEM;
1685                 wdev = &sdata->wdev;
1686 
1687                 sdata->dev = NULL;
1688                 strlcpy(sdata->name, name, IFNAMSIZ);
1689                 ieee80211_assign_perm_addr(local, wdev->address, type);
1690                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1691         } else {
1692                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1693                                  sizeof(void *));
1694                 int txq_size = 0;
1695 
1696                 if (local->ops->wake_tx_queue)
1697                         txq_size += sizeof(struct txq_info) +
1698                                     local->hw.txq_data_size;
1699 
1700                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1701                         txqs = IEEE80211_NUM_ACS;
1702 
1703                 ndev = alloc_netdev_mqs(size + txq_size,
1704                                         name, name_assign_type,
1705                                         ieee80211_if_setup, txqs, 1);
1706                 if (!ndev)
1707                         return -ENOMEM;
1708                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1709 
1710                 ndev->needed_headroom = local->tx_headroom +
1711                                         4*6 /* four MAC addresses */
1712                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1713                                         + 6 /* mesh */
1714                                         + 8 /* rfc1042/bridge tunnel */
1715                                         - ETH_HLEN /* ethernet hard_header_len */
1716                                         + IEEE80211_ENCRYPT_HEADROOM;
1717                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1718 
1719                 ret = dev_alloc_name(ndev, ndev->name);
1720                 if (ret < 0) {
1721                         free_netdev(ndev);
1722                         return ret;
1723                 }
1724 
1725                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1726                 if (params && is_valid_ether_addr(params->macaddr))
1727                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1728                 else
1729                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1730                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1731 
1732                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1733                 sdata = netdev_priv(ndev);
1734                 ndev->ieee80211_ptr = &sdata->wdev;
1735                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1736                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1737 
1738                 if (txq_size) {
1739                         txqi = netdev_priv(ndev) + size;
1740                         ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1741                 }
1742 
1743                 sdata->dev = ndev;
1744         }
1745 
1746         /* initialise type-independent data */
1747         sdata->wdev.wiphy = local->hw.wiphy;
1748         sdata->local = local;
1749 
1750         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1751                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1752 
1753         INIT_LIST_HEAD(&sdata->key_list);
1754 
1755         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1756                           ieee80211_dfs_cac_timer_work);
1757         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1758                           ieee80211_delayed_tailroom_dec);
1759 
1760         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1761                 struct ieee80211_supported_band *sband;
1762                 sband = local->hw.wiphy->bands[i];
1763                 sdata->rc_rateidx_mask[i] =
1764                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1765                 if (sband)
1766                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1767                                sband->ht_cap.mcs.rx_mask,
1768                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1769                 else
1770                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1771                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1772         }
1773 
1774         ieee80211_set_default_queues(sdata);
1775 
1776         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1777         sdata->user_power_level = local->user_power_level;
1778 
1779         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1780 
1781         /* setup type-dependent data */
1782         ieee80211_setup_sdata(sdata, type);
1783 
1784         if (ndev) {
1785                 if (params) {
1786                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1787                         if (type == NL80211_IFTYPE_STATION)
1788                                 sdata->u.mgd.use_4addr = params->use_4addr;
1789                 }
1790 
1791                 ndev->features |= local->hw.netdev_features;
1792 
1793                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1794 
1795                 ret = register_netdevice(ndev);
1796                 if (ret) {
1797                         free_netdev(ndev);
1798                         return ret;
1799                 }
1800         }
1801 
1802         mutex_lock(&local->iflist_mtx);
1803         list_add_tail_rcu(&sdata->list, &local->interfaces);
1804         mutex_unlock(&local->iflist_mtx);
1805 
1806         if (new_wdev)
1807                 *new_wdev = &sdata->wdev;
1808 
1809         return 0;
1810 }
1811 
1812 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1813 {
1814         ASSERT_RTNL();
1815 
1816         mutex_lock(&sdata->local->iflist_mtx);
1817         list_del_rcu(&sdata->list);
1818         mutex_unlock(&sdata->local->iflist_mtx);
1819 
1820         synchronize_rcu();
1821 
1822         if (sdata->dev) {
1823                 unregister_netdevice(sdata->dev);
1824         } else {
1825                 cfg80211_unregister_wdev(&sdata->wdev);
1826                 kfree(sdata);
1827         }
1828 }
1829 
1830 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1831 {
1832         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1833                 return;
1834         ieee80211_do_stop(sdata, true);
1835         ieee80211_teardown_sdata(sdata);
1836 }
1837 
1838 /*
1839  * Remove all interfaces, may only be called at hardware unregistration
1840  * time because it doesn't do RCU-safe list removals.
1841  */
1842 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1843 {
1844         struct ieee80211_sub_if_data *sdata, *tmp;
1845         LIST_HEAD(unreg_list);
1846         LIST_HEAD(wdev_list);
1847 
1848         ASSERT_RTNL();
1849 
1850         /*
1851          * Close all AP_VLAN interfaces first, as otherwise they
1852          * might be closed while the AP interface they belong to
1853          * is closed, causing unregister_netdevice_many() to crash.
1854          */
1855         list_for_each_entry(sdata, &local->interfaces, list)
1856                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1857                         dev_close(sdata->dev);
1858 
1859         mutex_lock(&local->iflist_mtx);
1860         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1861                 list_del(&sdata->list);
1862 
1863                 if (sdata->dev)
1864                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1865                 else
1866                         list_add(&sdata->list, &wdev_list);
1867         }
1868         mutex_unlock(&local->iflist_mtx);
1869         unregister_netdevice_many(&unreg_list);
1870 
1871         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1872                 list_del(&sdata->list);
1873                 cfg80211_unregister_wdev(&sdata->wdev);
1874                 kfree(sdata);
1875         }
1876 }
1877 
1878 static int netdev_notify(struct notifier_block *nb,
1879                          unsigned long state, void *ptr)
1880 {
1881         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1882         struct ieee80211_sub_if_data *sdata;
1883 
1884         if (state != NETDEV_CHANGENAME)
1885                 return NOTIFY_DONE;
1886 
1887         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1888                 return NOTIFY_DONE;
1889 
1890         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1891                 return NOTIFY_DONE;
1892 
1893         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1894         memcpy(sdata->name, dev->name, IFNAMSIZ);
1895         ieee80211_debugfs_rename_netdev(sdata);
1896 
1897         return NOTIFY_OK;
1898 }
1899 
1900 static struct notifier_block mac80211_netdev_notifier = {
1901         .notifier_call = netdev_notify,
1902 };
1903 
1904 int ieee80211_iface_init(void)
1905 {
1906         return register_netdevice_notifier(&mac80211_netdev_notifier);
1907 }
1908 
1909 void ieee80211_iface_exit(void)
1910 {
1911         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1912 }
1913 

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