Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 46 {
 47         struct ieee80211_chanctx_conf *chanctx_conf;
 48         int power;
 49 
 50         rcu_read_lock();
 51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 52         if (!chanctx_conf) {
 53                 rcu_read_unlock();
 54                 return false;
 55         }
 56 
 57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 58         rcu_read_unlock();
 59 
 60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 61                 power = min(power, sdata->user_power_level);
 62 
 63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 64                 power = min(power, sdata->ap_power_level);
 65 
 66         if (power != sdata->vif.bss_conf.txpower) {
 67                 sdata->vif.bss_conf.txpower = power;
 68                 ieee80211_hw_config(sdata->local, 0);
 69                 return true;
 70         }
 71 
 72         return false;
 73 }
 74 
 75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 76 {
 77         if (__ieee80211_recalc_txpower(sdata))
 78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 79 }
 80 
 81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 82 {
 83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 84                 return 0;
 85 
 86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 87         return IEEE80211_CONF_CHANGE_IDLE;
 88 }
 89 
 90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 91 {
 92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 93                 return 0;
 94 
 95         ieee80211_flush_queues(local, NULL);
 96 
 97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 98         return IEEE80211_CONF_CHANGE_IDLE;
 99 }
100 
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102                                    bool force_active)
103 {
104         bool working, scanning, active;
105         unsigned int led_trig_start = 0, led_trig_stop = 0;
106 
107         lockdep_assert_held(&local->mtx);
108 
109         active = force_active ||
110                  !list_empty(&local->chanctx_list) ||
111                  local->monitors;
112 
113         working = !local->ops->remain_on_channel &&
114                   !list_empty(&local->roc_list);
115 
116         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
117                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
118 
119         if (working || scanning)
120                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
121         else
122                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123 
124         if (active)
125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
126         else
127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128 
129         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
130 
131         if (working || scanning || active)
132                 return __ieee80211_idle_off(local);
133         return __ieee80211_idle_on(local);
134 }
135 
136 u32 ieee80211_idle_off(struct ieee80211_local *local)
137 {
138         return __ieee80211_recalc_idle(local, true);
139 }
140 
141 void ieee80211_recalc_idle(struct ieee80211_local *local)
142 {
143         u32 change = __ieee80211_recalc_idle(local, false);
144         if (change)
145                 ieee80211_hw_config(local, change);
146 }
147 
148 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
149 {
150         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
151                 return -EINVAL;
152 
153         dev->mtu = new_mtu;
154         return 0;
155 }
156 
157 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
158                                 bool check_dup)
159 {
160         struct ieee80211_local *local = sdata->local;
161         struct ieee80211_sub_if_data *iter;
162         u64 new, mask, tmp;
163         u8 *m;
164         int ret = 0;
165 
166         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
167                 return 0;
168 
169         m = addr;
170         new =   ((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         m = local->hw.wiphy->addr_mask;
175         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178 
179         if (!check_dup)
180                 return ret;
181 
182         mutex_lock(&local->iflist_mtx);
183         list_for_each_entry(iter, &local->interfaces, list) {
184                 if (iter == sdata)
185                         continue;
186 
187                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
188                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
189                         continue;
190 
191                 m = iter->vif.addr;
192                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
193                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
194                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
195 
196                 if ((new & ~mask) != (tmp & ~mask)) {
197                         ret = -EINVAL;
198                         break;
199                 }
200         }
201         mutex_unlock(&local->iflist_mtx);
202 
203         return ret;
204 }
205 
206 static int ieee80211_change_mac(struct net_device *dev, void *addr)
207 {
208         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
209         struct sockaddr *sa = addr;
210         bool check_dup = true;
211         int ret;
212 
213         if (ieee80211_sdata_running(sdata))
214                 return -EBUSY;
215 
216         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
217             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
218                 check_dup = false;
219 
220         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
221         if (ret)
222                 return ret;
223 
224         ret = eth_mac_addr(dev, sa);
225 
226         if (ret == 0)
227                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
228 
229         return ret;
230 }
231 
232 static inline int identical_mac_addr_allowed(int type1, int type2)
233 {
234         return type1 == NL80211_IFTYPE_MONITOR ||
235                 type2 == NL80211_IFTYPE_MONITOR ||
236                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
237                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
238                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
239                 (type1 == NL80211_IFTYPE_WDS &&
240                         (type2 == NL80211_IFTYPE_WDS ||
241                          type2 == NL80211_IFTYPE_AP)) ||
242                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
243                 (type1 == NL80211_IFTYPE_AP_VLAN &&
244                         (type2 == NL80211_IFTYPE_AP ||
245                          type2 == NL80211_IFTYPE_AP_VLAN));
246 }
247 
248 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
249                                             enum nl80211_iftype iftype)
250 {
251         struct ieee80211_local *local = sdata->local;
252         struct ieee80211_sub_if_data *nsdata;
253         int ret;
254 
255         ASSERT_RTNL();
256 
257         /* we hold the RTNL here so can safely walk the list */
258         list_for_each_entry(nsdata, &local->interfaces, list) {
259                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
260                         /*
261                          * Allow only a single IBSS interface to be up at any
262                          * time. This is restricted because beacon distribution
263                          * cannot work properly if both are in the same IBSS.
264                          *
265                          * To remove this restriction we'd have to disallow them
266                          * from setting the same SSID on different IBSS interfaces
267                          * belonging to the same hardware. Then, however, we're
268                          * faced with having to adopt two different TSF timers...
269                          */
270                         if (iftype == NL80211_IFTYPE_ADHOC &&
271                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
272                                 return -EBUSY;
273                         /*
274                          * will not add another interface while any channel
275                          * switch is active.
276                          */
277                         if (nsdata->vif.csa_active)
278                                 return -EBUSY;
279 
280                         /*
281                          * The remaining checks are only performed for interfaces
282                          * with the same MAC address.
283                          */
284                         if (!ether_addr_equal(sdata->vif.addr,
285                                               nsdata->vif.addr))
286                                 continue;
287 
288                         /*
289                          * check whether it may have the same address
290                          */
291                         if (!identical_mac_addr_allowed(iftype,
292                                                         nsdata->vif.type))
293                                 return -ENOTUNIQ;
294 
295                         /*
296                          * can only add VLANs to enabled APs
297                          */
298                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
299                             nsdata->vif.type == NL80211_IFTYPE_AP)
300                                 sdata->bss = &nsdata->u.ap;
301                 }
302         }
303 
304         mutex_lock(&local->chanctx_mtx);
305         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
306         mutex_unlock(&local->chanctx_mtx);
307         return ret;
308 }
309 
310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
311                                   enum nl80211_iftype iftype)
312 {
313         int n_queues = sdata->local->hw.queues;
314         int i;
315 
316         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
317                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
318                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
319                                          IEEE80211_INVAL_HW_QUEUE))
320                                 return -EINVAL;
321                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
322                                          n_queues))
323                                 return -EINVAL;
324                 }
325         }
326 
327         if ((iftype != NL80211_IFTYPE_AP &&
328              iftype != NL80211_IFTYPE_P2P_GO &&
329              iftype != NL80211_IFTYPE_MESH_POINT) ||
330             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
331                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
332                 return 0;
333         }
334 
335         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
336                 return -EINVAL;
337 
338         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
339                 return -EINVAL;
340 
341         return 0;
342 }
343 
344 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
345                                     const int offset)
346 {
347         struct ieee80211_local *local = sdata->local;
348         u32 flags = sdata->u.mntr_flags;
349 
350 #define ADJUST(_f, _s)  do {                                    \
351         if (flags & MONITOR_FLAG_##_f)                          \
352                 local->fif_##_s += offset;                      \
353         } while (0)
354 
355         ADJUST(FCSFAIL, fcsfail);
356         ADJUST(PLCPFAIL, plcpfail);
357         ADJUST(CONTROL, control);
358         ADJUST(CONTROL, pspoll);
359         ADJUST(OTHER_BSS, other_bss);
360 
361 #undef ADJUST
362 }
363 
364 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
365 {
366         struct ieee80211_local *local = sdata->local;
367         int i;
368 
369         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
370                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
371                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
372                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
373                         sdata->vif.hw_queue[i] = i;
374                 else
375                         sdata->vif.hw_queue[i] = 0;
376         }
377         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
378 }
379 
380 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
381 {
382         struct ieee80211_sub_if_data *sdata;
383         int ret;
384 
385         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
386                 return 0;
387 
388         ASSERT_RTNL();
389 
390         if (local->monitor_sdata)
391                 return 0;
392 
393         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
394         if (!sdata)
395                 return -ENOMEM;
396 
397         /* set up data */
398         sdata->local = local;
399         sdata->vif.type = NL80211_IFTYPE_MONITOR;
400         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
401                  wiphy_name(local->hw.wiphy));
402         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
403 
404         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
405 
406         ieee80211_set_default_queues(sdata);
407 
408         ret = drv_add_interface(local, sdata);
409         if (WARN_ON(ret)) {
410                 /* ok .. stupid driver, it asked for this! */
411                 kfree(sdata);
412                 return ret;
413         }
414 
415         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
416         if (ret) {
417                 kfree(sdata);
418                 return ret;
419         }
420 
421         mutex_lock(&local->iflist_mtx);
422         rcu_assign_pointer(local->monitor_sdata, sdata);
423         mutex_unlock(&local->iflist_mtx);
424 
425         mutex_lock(&local->mtx);
426         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
427                                         IEEE80211_CHANCTX_EXCLUSIVE);
428         mutex_unlock(&local->mtx);
429         if (ret) {
430                 mutex_lock(&local->iflist_mtx);
431                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
432                 mutex_unlock(&local->iflist_mtx);
433                 synchronize_net();
434                 drv_remove_interface(local, sdata);
435                 kfree(sdata);
436                 return ret;
437         }
438 
439         return 0;
440 }
441 
442 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
443 {
444         struct ieee80211_sub_if_data *sdata;
445 
446         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
447                 return;
448 
449         ASSERT_RTNL();
450 
451         mutex_lock(&local->iflist_mtx);
452 
453         sdata = rcu_dereference_protected(local->monitor_sdata,
454                                           lockdep_is_held(&local->iflist_mtx));
455         if (!sdata) {
456                 mutex_unlock(&local->iflist_mtx);
457                 return;
458         }
459 
460         RCU_INIT_POINTER(local->monitor_sdata, NULL);
461         mutex_unlock(&local->iflist_mtx);
462 
463         synchronize_net();
464 
465         mutex_lock(&local->mtx);
466         ieee80211_vif_release_channel(sdata);
467         mutex_unlock(&local->mtx);
468 
469         drv_remove_interface(local, sdata);
470 
471         kfree(sdata);
472 }
473 
474 /*
475  * NOTE: Be very careful when changing this function, it must NOT return
476  * an error on interface type changes that have been pre-checked, so most
477  * checks should be in ieee80211_check_concurrent_iface.
478  */
479 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
480 {
481         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
482         struct net_device *dev = wdev->netdev;
483         struct ieee80211_local *local = sdata->local;
484         struct sta_info *sta;
485         u32 changed = 0;
486         int res;
487         u32 hw_reconf_flags = 0;
488 
489         switch (sdata->vif.type) {
490         case NL80211_IFTYPE_WDS:
491                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
492                         return -ENOLINK;
493                 break;
494         case NL80211_IFTYPE_AP_VLAN: {
495                 struct ieee80211_sub_if_data *master;
496 
497                 if (!sdata->bss)
498                         return -ENOLINK;
499 
500                 mutex_lock(&local->mtx);
501                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
502                 mutex_unlock(&local->mtx);
503 
504                 master = container_of(sdata->bss,
505                                       struct ieee80211_sub_if_data, u.ap);
506                 sdata->control_port_protocol =
507                         master->control_port_protocol;
508                 sdata->control_port_no_encrypt =
509                         master->control_port_no_encrypt;
510                 sdata->vif.cab_queue = master->vif.cab_queue;
511                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
512                        sizeof(sdata->vif.hw_queue));
513                 break;
514                 }
515         case NL80211_IFTYPE_AP:
516                 sdata->bss = &sdata->u.ap;
517                 break;
518         case NL80211_IFTYPE_MESH_POINT:
519         case NL80211_IFTYPE_STATION:
520         case NL80211_IFTYPE_MONITOR:
521         case NL80211_IFTYPE_ADHOC:
522         case NL80211_IFTYPE_P2P_DEVICE:
523                 /* no special treatment */
524                 break;
525         case NL80211_IFTYPE_UNSPECIFIED:
526         case NUM_NL80211_IFTYPES:
527         case NL80211_IFTYPE_P2P_CLIENT:
528         case NL80211_IFTYPE_P2P_GO:
529                 /* cannot happen */
530                 WARN_ON(1);
531                 break;
532         }
533 
534         if (local->open_count == 0) {
535                 res = drv_start(local);
536                 if (res)
537                         goto err_del_bss;
538                 /* we're brought up, everything changes */
539                 hw_reconf_flags = ~0;
540                 ieee80211_led_radio(local, true);
541                 ieee80211_mod_tpt_led_trig(local,
542                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
543         }
544 
545         /*
546          * Copy the hopefully now-present MAC address to
547          * this interface, if it has the special null one.
548          */
549         if (dev && is_zero_ether_addr(dev->dev_addr)) {
550                 memcpy(dev->dev_addr,
551                        local->hw.wiphy->perm_addr,
552                        ETH_ALEN);
553                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
554 
555                 if (!is_valid_ether_addr(dev->dev_addr)) {
556                         res = -EADDRNOTAVAIL;
557                         goto err_stop;
558                 }
559         }
560 
561         switch (sdata->vif.type) {
562         case NL80211_IFTYPE_AP_VLAN:
563                 /* no need to tell driver, but set carrier and chanctx */
564                 if (rtnl_dereference(sdata->bss->beacon)) {
565                         ieee80211_vif_vlan_copy_chanctx(sdata);
566                         netif_carrier_on(dev);
567                 } else {
568                         netif_carrier_off(dev);
569                 }
570                 break;
571         case NL80211_IFTYPE_MONITOR:
572                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
573                         local->cooked_mntrs++;
574                         break;
575                 }
576 
577                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
578                         res = drv_add_interface(local, sdata);
579                         if (res)
580                                 goto err_stop;
581                 } else if (local->monitors == 0 && local->open_count == 0) {
582                         res = ieee80211_add_virtual_monitor(local);
583                         if (res)
584                                 goto err_stop;
585                 }
586 
587                 /* must be before the call to ieee80211_configure_filter */
588                 local->monitors++;
589                 if (local->monitors == 1) {
590                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
591                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
592                 }
593 
594                 ieee80211_adjust_monitor_flags(sdata, 1);
595                 ieee80211_configure_filter(local);
596                 mutex_lock(&local->mtx);
597                 ieee80211_recalc_idle(local);
598                 mutex_unlock(&local->mtx);
599 
600                 netif_carrier_on(dev);
601                 break;
602         default:
603                 if (coming_up) {
604                         ieee80211_del_virtual_monitor(local);
605 
606                         res = drv_add_interface(local, sdata);
607                         if (res)
608                                 goto err_stop;
609                         res = ieee80211_check_queues(sdata,
610                                 ieee80211_vif_type_p2p(&sdata->vif));
611                         if (res)
612                                 goto err_del_interface;
613                 }
614 
615                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
616                         local->fif_pspoll++;
617                         local->fif_probe_req++;
618 
619                         ieee80211_configure_filter(local);
620                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
621                         local->fif_probe_req++;
622                 }
623 
624                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
625                         changed |= ieee80211_reset_erp_info(sdata);
626                 ieee80211_bss_info_change_notify(sdata, changed);
627 
628                 switch (sdata->vif.type) {
629                 case NL80211_IFTYPE_STATION:
630                 case NL80211_IFTYPE_ADHOC:
631                 case NL80211_IFTYPE_AP:
632                 case NL80211_IFTYPE_MESH_POINT:
633                         netif_carrier_off(dev);
634                         break;
635                 case NL80211_IFTYPE_WDS:
636                 case NL80211_IFTYPE_P2P_DEVICE:
637                         break;
638                 default:
639                         /* not reached */
640                         WARN_ON(1);
641                 }
642 
643                 /*
644                  * set default queue parameters so drivers don't
645                  * need to initialise the hardware if the hardware
646                  * doesn't start up with sane defaults
647                  */
648                 ieee80211_set_wmm_default(sdata, true);
649         }
650 
651         set_bit(SDATA_STATE_RUNNING, &sdata->state);
652 
653         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
654                 /* Create STA entry for the WDS peer */
655                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
656                                      GFP_KERNEL);
657                 if (!sta) {
658                         res = -ENOMEM;
659                         goto err_del_interface;
660                 }
661 
662                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
663                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
664                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
665 
666                 res = sta_info_insert(sta);
667                 if (res) {
668                         /* STA has been freed */
669                         goto err_del_interface;
670                 }
671 
672                 rate_control_rate_init(sta);
673                 netif_carrier_on(dev);
674         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
675                 rcu_assign_pointer(local->p2p_sdata, sdata);
676         }
677 
678         /*
679          * set_multicast_list will be invoked by the networking core
680          * which will check whether any increments here were done in
681          * error and sync them down to the hardware as filter flags.
682          */
683         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
684                 atomic_inc(&local->iff_allmultis);
685 
686         if (sdata->flags & IEEE80211_SDATA_PROMISC)
687                 atomic_inc(&local->iff_promiscs);
688 
689         if (coming_up)
690                 local->open_count++;
691 
692         if (hw_reconf_flags)
693                 ieee80211_hw_config(local, hw_reconf_flags);
694 
695         ieee80211_recalc_ps(local, -1);
696 
697         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
698             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
699                 /* XXX: for AP_VLAN, actually track AP queues */
700                 netif_tx_start_all_queues(dev);
701         } else if (dev) {
702                 unsigned long flags;
703                 int n_acs = IEEE80211_NUM_ACS;
704                 int ac;
705 
706                 if (local->hw.queues < IEEE80211_NUM_ACS)
707                         n_acs = 1;
708 
709                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
710                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
711                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
712                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
713                         for (ac = 0; ac < n_acs; ac++) {
714                                 int ac_queue = sdata->vif.hw_queue[ac];
715 
716                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
717                                     skb_queue_empty(&local->pending[ac_queue]))
718                                         netif_start_subqueue(dev, ac);
719                         }
720                 }
721                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
722         }
723 
724         return 0;
725  err_del_interface:
726         drv_remove_interface(local, sdata);
727  err_stop:
728         if (!local->open_count)
729                 drv_stop(local);
730  err_del_bss:
731         sdata->bss = NULL;
732         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
733                 mutex_lock(&local->mtx);
734                 list_del(&sdata->u.vlan.list);
735                 mutex_unlock(&local->mtx);
736         }
737         /* might already be clear but that doesn't matter */
738         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
739         return res;
740 }
741 
742 static int ieee80211_open(struct net_device *dev)
743 {
744         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
745         int err;
746 
747         /* fail early if user set an invalid address */
748         if (!is_valid_ether_addr(dev->dev_addr))
749                 return -EADDRNOTAVAIL;
750 
751         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
752         if (err)
753                 return err;
754 
755         return ieee80211_do_open(&sdata->wdev, true);
756 }
757 
758 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
759                               bool going_down)
760 {
761         struct ieee80211_local *local = sdata->local;
762         unsigned long flags;
763         struct sk_buff *skb, *tmp;
764         u32 hw_reconf_flags = 0;
765         int i, flushed;
766         struct ps_data *ps;
767         struct cfg80211_chan_def chandef;
768 
769         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
770 
771         if (rcu_access_pointer(local->scan_sdata) == sdata)
772                 ieee80211_scan_cancel(local);
773 
774         /*
775          * Stop TX on this interface first.
776          */
777         if (sdata->dev)
778                 netif_tx_stop_all_queues(sdata->dev);
779 
780         ieee80211_roc_purge(local, sdata);
781 
782         switch (sdata->vif.type) {
783         case NL80211_IFTYPE_STATION:
784                 ieee80211_mgd_stop(sdata);
785                 break;
786         case NL80211_IFTYPE_ADHOC:
787                 ieee80211_ibss_stop(sdata);
788                 break;
789         case NL80211_IFTYPE_AP:
790                 cancel_work_sync(&sdata->u.ap.request_smps_work);
791                 break;
792         default:
793                 break;
794         }
795 
796         /*
797          * Remove all stations associated with this interface.
798          *
799          * This must be done before calling ops->remove_interface()
800          * because otherwise we can later invoke ops->sta_notify()
801          * whenever the STAs are removed, and that invalidates driver
802          * assumptions about always getting a vif pointer that is valid
803          * (because if we remove a STA after ops->remove_interface()
804          * the driver will have removed the vif info already!)
805          *
806          * This is relevant only in WDS mode, in all other modes we've
807          * already removed all stations when disconnecting or similar,
808          * so warn otherwise.
809          */
810         flushed = sta_info_flush(sdata);
811         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
812                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
813 
814         /* don't count this interface for promisc/allmulti while it is down */
815         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
816                 atomic_dec(&local->iff_allmultis);
817 
818         if (sdata->flags & IEEE80211_SDATA_PROMISC)
819                 atomic_dec(&local->iff_promiscs);
820 
821         if (sdata->vif.type == NL80211_IFTYPE_AP) {
822                 local->fif_pspoll--;
823                 local->fif_probe_req--;
824         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
825                 local->fif_probe_req--;
826         }
827 
828         if (sdata->dev) {
829                 netif_addr_lock_bh(sdata->dev);
830                 spin_lock_bh(&local->filter_lock);
831                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
832                                  sdata->dev->addr_len);
833                 spin_unlock_bh(&local->filter_lock);
834                 netif_addr_unlock_bh(sdata->dev);
835         }
836 
837         del_timer_sync(&local->dynamic_ps_timer);
838         cancel_work_sync(&local->dynamic_ps_enable_work);
839 
840         cancel_work_sync(&sdata->recalc_smps);
841         sdata_lock(sdata);
842         mutex_lock(&local->mtx);
843         sdata->vif.csa_active = false;
844         if (sdata->csa_block_tx) {
845                 ieee80211_wake_vif_queues(local, sdata,
846                                           IEEE80211_QUEUE_STOP_REASON_CSA);
847                 sdata->csa_block_tx = false;
848         }
849         mutex_unlock(&local->mtx);
850         sdata_unlock(sdata);
851 
852         cancel_work_sync(&sdata->csa_finalize_work);
853 
854         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
855 
856         if (sdata->wdev.cac_started) {
857                 chandef = sdata->vif.bss_conf.chandef;
858                 WARN_ON(local->suspended);
859                 mutex_lock(&local->mtx);
860                 ieee80211_vif_release_channel(sdata);
861                 mutex_unlock(&local->mtx);
862                 cfg80211_cac_event(sdata->dev, &chandef,
863                                    NL80211_RADAR_CAC_ABORTED,
864                                    GFP_KERNEL);
865         }
866 
867         /* APs need special treatment */
868         if (sdata->vif.type == NL80211_IFTYPE_AP) {
869                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
870 
871                 /* down all dependent devices, that is VLANs */
872                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
873                                          u.vlan.list)
874                         dev_close(vlan->dev);
875                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
876         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
877                 /* remove all packets in parent bc_buf pointing to this dev */
878                 ps = &sdata->bss->ps;
879 
880                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
881                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
882                         if (skb->dev == sdata->dev) {
883                                 __skb_unlink(skb, &ps->bc_buf);
884                                 local->total_ps_buffered--;
885                                 ieee80211_free_txskb(&local->hw, skb);
886                         }
887                 }
888                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
889         }
890 
891         if (going_down)
892                 local->open_count--;
893 
894         switch (sdata->vif.type) {
895         case NL80211_IFTYPE_AP_VLAN:
896                 mutex_lock(&local->mtx);
897                 list_del(&sdata->u.vlan.list);
898                 mutex_unlock(&local->mtx);
899                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
900                 /* no need to tell driver */
901                 break;
902         case NL80211_IFTYPE_MONITOR:
903                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
904                         local->cooked_mntrs--;
905                         break;
906                 }
907 
908                 local->monitors--;
909                 if (local->monitors == 0) {
910                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
911                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
912                 }
913 
914                 ieee80211_adjust_monitor_flags(sdata, -1);
915                 break;
916         case NL80211_IFTYPE_P2P_DEVICE:
917                 /* relies on synchronize_rcu() below */
918                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
919                 /* fall through */
920         default:
921                 cancel_work_sync(&sdata->work);
922                 /*
923                  * When we get here, the interface is marked down.
924                  * Free the remaining keys, if there are any
925                  * (shouldn't be, except maybe in WDS mode?)
926                  *
927                  * Force the key freeing to always synchronize_net()
928                  * to wait for the RX path in case it is using this
929                  * interface enqueuing frames * at this very time on
930                  * another CPU.
931                  */
932                 ieee80211_free_keys(sdata, true);
933 
934                 /* fall through */
935         case NL80211_IFTYPE_AP:
936                 skb_queue_purge(&sdata->skb_queue);
937         }
938 
939         sdata->bss = NULL;
940 
941         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
942         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
943                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
944                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
945                         if (info->control.vif == &sdata->vif) {
946                                 __skb_unlink(skb, &local->pending[i]);
947                                 ieee80211_free_txskb(&local->hw, skb);
948                         }
949                 }
950         }
951         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
952 
953         if (local->open_count == 0)
954                 ieee80211_clear_tx_pending(local);
955 
956         /*
957          * If the interface goes down while suspended, presumably because
958          * the device was unplugged and that happens before our resume,
959          * then the driver is already unconfigured and the remainder of
960          * this function isn't needed.
961          * XXX: what about WoWLAN? If the device has software state, e.g.
962          *      memory allocated, it might expect teardown commands from
963          *      mac80211 here?
964          */
965         if (local->suspended) {
966                 WARN_ON(local->wowlan);
967                 WARN_ON(rtnl_dereference(local->monitor_sdata));
968                 return;
969         }
970 
971         switch (sdata->vif.type) {
972         case NL80211_IFTYPE_AP_VLAN:
973                 break;
974         case NL80211_IFTYPE_MONITOR:
975                 if (local->monitors == 0)
976                         ieee80211_del_virtual_monitor(local);
977 
978                 mutex_lock(&local->mtx);
979                 ieee80211_recalc_idle(local);
980                 mutex_unlock(&local->mtx);
981 
982                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
983                         break;
984 
985                 /* fall through */
986         default:
987                 if (going_down)
988                         drv_remove_interface(local, sdata);
989         }
990 
991         ieee80211_recalc_ps(local, -1);
992 
993         if (local->open_count == 0) {
994                 ieee80211_stop_device(local);
995 
996                 /* no reconfiguring after stop! */
997                 return;
998         }
999 
1000         /* do after stop to avoid reconfiguring when we stop anyway */
1001         ieee80211_configure_filter(local);
1002         ieee80211_hw_config(local, hw_reconf_flags);
1003 
1004         if (local->monitors == local->open_count)
1005                 ieee80211_add_virtual_monitor(local);
1006 }
1007 
1008 static int ieee80211_stop(struct net_device *dev)
1009 {
1010         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1011 
1012         ieee80211_do_stop(sdata, true);
1013 
1014         return 0;
1015 }
1016 
1017 static void ieee80211_set_multicast_list(struct net_device *dev)
1018 {
1019         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1020         struct ieee80211_local *local = sdata->local;
1021         int allmulti, promisc, sdata_allmulti, sdata_promisc;
1022 
1023         allmulti = !!(dev->flags & IFF_ALLMULTI);
1024         promisc = !!(dev->flags & IFF_PROMISC);
1025         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1026         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1027 
1028         if (allmulti != sdata_allmulti) {
1029                 if (dev->flags & IFF_ALLMULTI)
1030                         atomic_inc(&local->iff_allmultis);
1031                 else
1032                         atomic_dec(&local->iff_allmultis);
1033                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1034         }
1035 
1036         if (promisc != sdata_promisc) {
1037                 if (dev->flags & IFF_PROMISC)
1038                         atomic_inc(&local->iff_promiscs);
1039                 else
1040                         atomic_dec(&local->iff_promiscs);
1041                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1042         }
1043         spin_lock_bh(&local->filter_lock);
1044         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1045         spin_unlock_bh(&local->filter_lock);
1046         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1047 }
1048 
1049 /*
1050  * Called when the netdev is removed or, by the code below, before
1051  * the interface type changes.
1052  */
1053 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1054 {
1055         int i;
1056 
1057         /* free extra data */
1058         ieee80211_free_keys(sdata, false);
1059 
1060         ieee80211_debugfs_remove_netdev(sdata);
1061 
1062         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1063                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1064         sdata->fragment_next = 0;
1065 
1066         if (ieee80211_vif_is_mesh(&sdata->vif))
1067                 mesh_rmc_free(sdata);
1068 }
1069 
1070 static void ieee80211_uninit(struct net_device *dev)
1071 {
1072         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1073 }
1074 
1075 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1076                                          struct sk_buff *skb,
1077                                          void *accel_priv,
1078                                          select_queue_fallback_t fallback)
1079 {
1080         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1081 }
1082 
1083 static const struct net_device_ops ieee80211_dataif_ops = {
1084         .ndo_open               = ieee80211_open,
1085         .ndo_stop               = ieee80211_stop,
1086         .ndo_uninit             = ieee80211_uninit,
1087         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1088         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1089         .ndo_change_mtu         = ieee80211_change_mtu,
1090         .ndo_set_mac_address    = ieee80211_change_mac,
1091         .ndo_select_queue       = ieee80211_netdev_select_queue,
1092 };
1093 
1094 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1095                                           struct sk_buff *skb,
1096                                           void *accel_priv,
1097                                           select_queue_fallback_t fallback)
1098 {
1099         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1100         struct ieee80211_local *local = sdata->local;
1101         struct ieee80211_hdr *hdr;
1102         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1103 
1104         if (local->hw.queues < IEEE80211_NUM_ACS)
1105                 return 0;
1106 
1107         if (skb->len < 4 ||
1108             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1109                 return 0; /* doesn't matter, frame will be dropped */
1110 
1111         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1112 
1113         return ieee80211_select_queue_80211(sdata, skb, hdr);
1114 }
1115 
1116 static const struct net_device_ops ieee80211_monitorif_ops = {
1117         .ndo_open               = ieee80211_open,
1118         .ndo_stop               = ieee80211_stop,
1119         .ndo_uninit             = ieee80211_uninit,
1120         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1121         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1122         .ndo_change_mtu         = ieee80211_change_mtu,
1123         .ndo_set_mac_address    = ieee80211_change_mac,
1124         .ndo_select_queue       = ieee80211_monitor_select_queue,
1125 };
1126 
1127 static void ieee80211_if_setup(struct net_device *dev)
1128 {
1129         ether_setup(dev);
1130         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1131         dev->netdev_ops = &ieee80211_dataif_ops;
1132         dev->destructor = free_netdev;
1133 }
1134 
1135 static void ieee80211_iface_work(struct work_struct *work)
1136 {
1137         struct ieee80211_sub_if_data *sdata =
1138                 container_of(work, struct ieee80211_sub_if_data, work);
1139         struct ieee80211_local *local = sdata->local;
1140         struct sk_buff *skb;
1141         struct sta_info *sta;
1142         struct ieee80211_ra_tid *ra_tid;
1143         struct ieee80211_rx_agg *rx_agg;
1144 
1145         if (!ieee80211_sdata_running(sdata))
1146                 return;
1147 
1148         if (local->scanning)
1149                 return;
1150 
1151         /*
1152          * ieee80211_queue_work() should have picked up most cases,
1153          * here we'll pick the rest.
1154          */
1155         if (WARN(local->suspended,
1156                  "interface work scheduled while going to suspend\n"))
1157                 return;
1158 
1159         /* first process frames */
1160         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1161                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1162 
1163                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1164                         ra_tid = (void *)&skb->cb;
1165                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1166                                                  ra_tid->tid);
1167                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1168                         ra_tid = (void *)&skb->cb;
1169                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1170                                                 ra_tid->tid);
1171                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1172                         rx_agg = (void *)&skb->cb;
1173                         mutex_lock(&local->sta_mtx);
1174                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1175                         if (sta) {
1176                                 u16 last_seq;
1177 
1178                                 last_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(
1179                                         sta->last_seq_ctrl[rx_agg->tid]));
1180 
1181                                 __ieee80211_start_rx_ba_session(sta,
1182                                                 0, 0,
1183                                                 ieee80211_sn_inc(last_seq),
1184                                                 1, rx_agg->tid,
1185                                                 IEEE80211_MAX_AMPDU_BUF,
1186                                                 false);
1187                         }
1188                         mutex_unlock(&local->sta_mtx);
1189                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1190                         rx_agg = (void *)&skb->cb;
1191                         mutex_lock(&local->sta_mtx);
1192                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1193                         if (sta)
1194                                 __ieee80211_stop_rx_ba_session(sta,
1195                                                         rx_agg->tid,
1196                                                         WLAN_BACK_RECIPIENT, 0,
1197                                                         false);
1198                         mutex_unlock(&local->sta_mtx);
1199                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1200                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1201                         int len = skb->len;
1202 
1203                         mutex_lock(&local->sta_mtx);
1204                         sta = sta_info_get_bss(sdata, mgmt->sa);
1205                         if (sta) {
1206                                 switch (mgmt->u.action.u.addba_req.action_code) {
1207                                 case WLAN_ACTION_ADDBA_REQ:
1208                                         ieee80211_process_addba_request(
1209                                                         local, sta, mgmt, len);
1210                                         break;
1211                                 case WLAN_ACTION_ADDBA_RESP:
1212                                         ieee80211_process_addba_resp(local, sta,
1213                                                                      mgmt, len);
1214                                         break;
1215                                 case WLAN_ACTION_DELBA:
1216                                         ieee80211_process_delba(sdata, sta,
1217                                                                 mgmt, len);
1218                                         break;
1219                                 default:
1220                                         WARN_ON(1);
1221                                         break;
1222                                 }
1223                         }
1224                         mutex_unlock(&local->sta_mtx);
1225                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1226                         struct ieee80211_hdr *hdr = (void *)mgmt;
1227                         /*
1228                          * So the frame isn't mgmt, but frame_control
1229                          * is at the right place anyway, of course, so
1230                          * the if statement is correct.
1231                          *
1232                          * Warn if we have other data frame types here,
1233                          * they must not get here.
1234                          */
1235                         WARN_ON(hdr->frame_control &
1236                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1237                         WARN_ON(!(hdr->seq_ctrl &
1238                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1239                         /*
1240                          * This was a fragment of a frame, received while
1241                          * a block-ack session was active. That cannot be
1242                          * right, so terminate the session.
1243                          */
1244                         mutex_lock(&local->sta_mtx);
1245                         sta = sta_info_get_bss(sdata, mgmt->sa);
1246                         if (sta) {
1247                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1248                                                 IEEE80211_QOS_CTL_TID_MASK;
1249 
1250                                 __ieee80211_stop_rx_ba_session(
1251                                         sta, tid, WLAN_BACK_RECIPIENT,
1252                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1253                                         true);
1254                         }
1255                         mutex_unlock(&local->sta_mtx);
1256                 } else switch (sdata->vif.type) {
1257                 case NL80211_IFTYPE_STATION:
1258                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1259                         break;
1260                 case NL80211_IFTYPE_ADHOC:
1261                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1262                         break;
1263                 case NL80211_IFTYPE_MESH_POINT:
1264                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1265                                 break;
1266                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1267                         break;
1268                 default:
1269                         WARN(1, "frame for unexpected interface type");
1270                         break;
1271                 }
1272 
1273                 kfree_skb(skb);
1274         }
1275 
1276         /* then other type-dependent work */
1277         switch (sdata->vif.type) {
1278         case NL80211_IFTYPE_STATION:
1279                 ieee80211_sta_work(sdata);
1280                 break;
1281         case NL80211_IFTYPE_ADHOC:
1282                 ieee80211_ibss_work(sdata);
1283                 break;
1284         case NL80211_IFTYPE_MESH_POINT:
1285                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1286                         break;
1287                 ieee80211_mesh_work(sdata);
1288                 break;
1289         default:
1290                 break;
1291         }
1292 }
1293 
1294 static void ieee80211_recalc_smps_work(struct work_struct *work)
1295 {
1296         struct ieee80211_sub_if_data *sdata =
1297                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1298 
1299         ieee80211_recalc_smps(sdata);
1300 }
1301 
1302 /*
1303  * Helper function to initialise an interface to a specific type.
1304  */
1305 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1306                                   enum nl80211_iftype type)
1307 {
1308         /* clear type-dependent union */
1309         memset(&sdata->u, 0, sizeof(sdata->u));
1310 
1311         /* and set some type-dependent values */
1312         sdata->vif.type = type;
1313         sdata->vif.p2p = false;
1314         sdata->wdev.iftype = type;
1315 
1316         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1317         sdata->control_port_no_encrypt = false;
1318         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1319         sdata->vif.bss_conf.idle = true;
1320 
1321         sdata->noack_map = 0;
1322 
1323         /* only monitor/p2p-device differ */
1324         if (sdata->dev) {
1325                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1326                 sdata->dev->type = ARPHRD_ETHER;
1327         }
1328 
1329         skb_queue_head_init(&sdata->skb_queue);
1330         INIT_WORK(&sdata->work, ieee80211_iface_work);
1331         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1332         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1333         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1334         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1335 
1336         switch (type) {
1337         case NL80211_IFTYPE_P2P_GO:
1338                 type = NL80211_IFTYPE_AP;
1339                 sdata->vif.type = type;
1340                 sdata->vif.p2p = true;
1341                 /* fall through */
1342         case NL80211_IFTYPE_AP:
1343                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1344                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1345                 INIT_WORK(&sdata->u.ap.request_smps_work,
1346                           ieee80211_request_smps_ap_work);
1347                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1348                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1349                 break;
1350         case NL80211_IFTYPE_P2P_CLIENT:
1351                 type = NL80211_IFTYPE_STATION;
1352                 sdata->vif.type = type;
1353                 sdata->vif.p2p = true;
1354                 /* fall through */
1355         case NL80211_IFTYPE_STATION:
1356                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1357                 ieee80211_sta_setup_sdata(sdata);
1358                 break;
1359         case NL80211_IFTYPE_ADHOC:
1360                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1361                 ieee80211_ibss_setup_sdata(sdata);
1362                 break;
1363         case NL80211_IFTYPE_MESH_POINT:
1364                 if (ieee80211_vif_is_mesh(&sdata->vif))
1365                         ieee80211_mesh_init_sdata(sdata);
1366                 break;
1367         case NL80211_IFTYPE_MONITOR:
1368                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1369                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1370                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1371                                       MONITOR_FLAG_OTHER_BSS;
1372                 break;
1373         case NL80211_IFTYPE_WDS:
1374                 sdata->vif.bss_conf.bssid = NULL;
1375                 break;
1376         case NL80211_IFTYPE_AP_VLAN:
1377         case NL80211_IFTYPE_P2P_DEVICE:
1378                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1379                 break;
1380         case NL80211_IFTYPE_UNSPECIFIED:
1381         case NUM_NL80211_IFTYPES:
1382                 BUG();
1383                 break;
1384         }
1385 
1386         ieee80211_debugfs_add_netdev(sdata);
1387 }
1388 
1389 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1390                                            enum nl80211_iftype type)
1391 {
1392         struct ieee80211_local *local = sdata->local;
1393         int ret, err;
1394         enum nl80211_iftype internal_type = type;
1395         bool p2p = false;
1396 
1397         ASSERT_RTNL();
1398 
1399         if (!local->ops->change_interface)
1400                 return -EBUSY;
1401 
1402         switch (sdata->vif.type) {
1403         case NL80211_IFTYPE_AP:
1404         case NL80211_IFTYPE_STATION:
1405         case NL80211_IFTYPE_ADHOC:
1406                 /*
1407                  * Could maybe also all others here?
1408                  * Just not sure how that interacts
1409                  * with the RX/config path e.g. for
1410                  * mesh.
1411                  */
1412                 break;
1413         default:
1414                 return -EBUSY;
1415         }
1416 
1417         switch (type) {
1418         case NL80211_IFTYPE_AP:
1419         case NL80211_IFTYPE_STATION:
1420         case NL80211_IFTYPE_ADHOC:
1421                 /*
1422                  * Could probably support everything
1423                  * but WDS here (WDS do_open can fail
1424                  * under memory pressure, which this
1425                  * code isn't prepared to handle).
1426                  */
1427                 break;
1428         case NL80211_IFTYPE_P2P_CLIENT:
1429                 p2p = true;
1430                 internal_type = NL80211_IFTYPE_STATION;
1431                 break;
1432         case NL80211_IFTYPE_P2P_GO:
1433                 p2p = true;
1434                 internal_type = NL80211_IFTYPE_AP;
1435                 break;
1436         default:
1437                 return -EBUSY;
1438         }
1439 
1440         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1441         if (ret)
1442                 return ret;
1443 
1444         ieee80211_do_stop(sdata, false);
1445 
1446         ieee80211_teardown_sdata(sdata);
1447 
1448         ret = drv_change_interface(local, sdata, internal_type, p2p);
1449         if (ret)
1450                 type = ieee80211_vif_type_p2p(&sdata->vif);
1451 
1452         /*
1453          * Ignore return value here, there's not much we can do since
1454          * the driver changed the interface type internally already.
1455          * The warnings will hopefully make driver authors fix it :-)
1456          */
1457         ieee80211_check_queues(sdata, type);
1458 
1459         ieee80211_setup_sdata(sdata, type);
1460 
1461         err = ieee80211_do_open(&sdata->wdev, false);
1462         WARN(err, "type change: do_open returned %d", err);
1463 
1464         return ret;
1465 }
1466 
1467 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1468                              enum nl80211_iftype type)
1469 {
1470         int ret;
1471 
1472         ASSERT_RTNL();
1473 
1474         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1475                 return 0;
1476 
1477         if (ieee80211_sdata_running(sdata)) {
1478                 ret = ieee80211_runtime_change_iftype(sdata, type);
1479                 if (ret)
1480                         return ret;
1481         } else {
1482                 /* Purge and reset type-dependent state. */
1483                 ieee80211_teardown_sdata(sdata);
1484                 ieee80211_setup_sdata(sdata, type);
1485         }
1486 
1487         /* reset some values that shouldn't be kept across type changes */
1488         sdata->drop_unencrypted = 0;
1489         if (type == NL80211_IFTYPE_STATION)
1490                 sdata->u.mgd.use_4addr = false;
1491 
1492         return 0;
1493 }
1494 
1495 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1496                                        u8 *perm_addr, enum nl80211_iftype type)
1497 {
1498         struct ieee80211_sub_if_data *sdata;
1499         u64 mask, start, addr, val, inc;
1500         u8 *m;
1501         u8 tmp_addr[ETH_ALEN];
1502         int i;
1503 
1504         /* default ... something at least */
1505         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1506 
1507         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1508             local->hw.wiphy->n_addresses <= 1)
1509                 return;
1510 
1511         mutex_lock(&local->iflist_mtx);
1512 
1513         switch (type) {
1514         case NL80211_IFTYPE_MONITOR:
1515                 /* doesn't matter */
1516                 break;
1517         case NL80211_IFTYPE_WDS:
1518         case NL80211_IFTYPE_AP_VLAN:
1519                 /* match up with an AP interface */
1520                 list_for_each_entry(sdata, &local->interfaces, list) {
1521                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1522                                 continue;
1523                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1524                         break;
1525                 }
1526                 /* keep default if no AP interface present */
1527                 break;
1528         case NL80211_IFTYPE_P2P_CLIENT:
1529         case NL80211_IFTYPE_P2P_GO:
1530                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1531                         list_for_each_entry(sdata, &local->interfaces, list) {
1532                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1533                                         continue;
1534                                 if (!ieee80211_sdata_running(sdata))
1535                                         continue;
1536                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1537                                 goto out_unlock;
1538                         }
1539                 }
1540                 /* otherwise fall through */
1541         default:
1542                 /* assign a new address if possible -- try n_addresses first */
1543                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1544                         bool used = false;
1545 
1546                         list_for_each_entry(sdata, &local->interfaces, list) {
1547                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1548                                                      sdata->vif.addr)) {
1549                                         used = true;
1550                                         break;
1551                                 }
1552                         }
1553 
1554                         if (!used) {
1555                                 memcpy(perm_addr,
1556                                        local->hw.wiphy->addresses[i].addr,
1557                                        ETH_ALEN);
1558                                 break;
1559                         }
1560                 }
1561 
1562                 /* try mask if available */
1563                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1564                         break;
1565 
1566                 m = local->hw.wiphy->addr_mask;
1567                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1568                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1569                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1570 
1571                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1572                         /* not a contiguous mask ... not handled now! */
1573                         pr_info("not contiguous\n");
1574                         break;
1575                 }
1576 
1577                 /*
1578                  * Pick address of existing interface in case user changed
1579                  * MAC address manually, default to perm_addr.
1580                  */
1581                 m = local->hw.wiphy->perm_addr;
1582                 list_for_each_entry(sdata, &local->interfaces, list) {
1583                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1584                                 continue;
1585                         m = sdata->vif.addr;
1586                         break;
1587                 }
1588                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1589                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1590                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1591 
1592                 inc = 1ULL<<__ffs64(mask);
1593                 val = (start & mask);
1594                 addr = (start & ~mask) | (val & mask);
1595                 do {
1596                         bool used = false;
1597 
1598                         tmp_addr[5] = addr >> 0*8;
1599                         tmp_addr[4] = addr >> 1*8;
1600                         tmp_addr[3] = addr >> 2*8;
1601                         tmp_addr[2] = addr >> 3*8;
1602                         tmp_addr[1] = addr >> 4*8;
1603                         tmp_addr[0] = addr >> 5*8;
1604 
1605                         val += inc;
1606 
1607                         list_for_each_entry(sdata, &local->interfaces, list) {
1608                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1609                                         used = true;
1610                                         break;
1611                                 }
1612                         }
1613 
1614                         if (!used) {
1615                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1616                                 break;
1617                         }
1618                         addr = (start & ~mask) | (val & mask);
1619                 } while (addr != start);
1620 
1621                 break;
1622         }
1623 
1624  out_unlock:
1625         mutex_unlock(&local->iflist_mtx);
1626 }
1627 
1628 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1629                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1630                      struct vif_params *params)
1631 {
1632         struct net_device *ndev = NULL;
1633         struct ieee80211_sub_if_data *sdata = NULL;
1634         int ret, i;
1635         int txqs = 1;
1636 
1637         ASSERT_RTNL();
1638 
1639         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1640                 struct wireless_dev *wdev;
1641 
1642                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1643                                 GFP_KERNEL);
1644                 if (!sdata)
1645                         return -ENOMEM;
1646                 wdev = &sdata->wdev;
1647 
1648                 sdata->dev = NULL;
1649                 strlcpy(sdata->name, name, IFNAMSIZ);
1650                 ieee80211_assign_perm_addr(local, wdev->address, type);
1651                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1652         } else {
1653                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1654                         txqs = IEEE80211_NUM_ACS;
1655 
1656                 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1657                                         name, NET_NAME_UNKNOWN,
1658                                         ieee80211_if_setup, txqs, 1);
1659                 if (!ndev)
1660                         return -ENOMEM;
1661                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1662 
1663                 ndev->needed_headroom = local->tx_headroom +
1664                                         4*6 /* four MAC addresses */
1665                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1666                                         + 6 /* mesh */
1667                                         + 8 /* rfc1042/bridge tunnel */
1668                                         - ETH_HLEN /* ethernet hard_header_len */
1669                                         + IEEE80211_ENCRYPT_HEADROOM;
1670                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1671 
1672                 ret = dev_alloc_name(ndev, ndev->name);
1673                 if (ret < 0) {
1674                         free_netdev(ndev);
1675                         return ret;
1676                 }
1677 
1678                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1679                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1680                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1681 
1682                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1683                 sdata = netdev_priv(ndev);
1684                 ndev->ieee80211_ptr = &sdata->wdev;
1685                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1686                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1687 
1688                 sdata->dev = ndev;
1689         }
1690 
1691         /* initialise type-independent data */
1692         sdata->wdev.wiphy = local->hw.wiphy;
1693         sdata->local = local;
1694 
1695         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1696                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1697 
1698         INIT_LIST_HEAD(&sdata->key_list);
1699 
1700         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1701                           ieee80211_dfs_cac_timer_work);
1702         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1703                           ieee80211_delayed_tailroom_dec);
1704 
1705         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1706                 struct ieee80211_supported_band *sband;
1707                 sband = local->hw.wiphy->bands[i];
1708                 sdata->rc_rateidx_mask[i] =
1709                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1710                 if (sband)
1711                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1712                                sband->ht_cap.mcs.rx_mask,
1713                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1714                 else
1715                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1716                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1717         }
1718 
1719         ieee80211_set_default_queues(sdata);
1720 
1721         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1722         sdata->user_power_level = local->user_power_level;
1723 
1724         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1725 
1726         /* setup type-dependent data */
1727         ieee80211_setup_sdata(sdata, type);
1728 
1729         if (ndev) {
1730                 if (params) {
1731                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1732                         if (type == NL80211_IFTYPE_STATION)
1733                                 sdata->u.mgd.use_4addr = params->use_4addr;
1734                 }
1735 
1736                 ndev->features |= local->hw.netdev_features;
1737 
1738                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1739 
1740                 ret = register_netdevice(ndev);
1741                 if (ret) {
1742                         free_netdev(ndev);
1743                         return ret;
1744                 }
1745         }
1746 
1747         mutex_lock(&local->iflist_mtx);
1748         list_add_tail_rcu(&sdata->list, &local->interfaces);
1749         mutex_unlock(&local->iflist_mtx);
1750 
1751         if (new_wdev)
1752                 *new_wdev = &sdata->wdev;
1753 
1754         return 0;
1755 }
1756 
1757 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1758 {
1759         ASSERT_RTNL();
1760 
1761         mutex_lock(&sdata->local->iflist_mtx);
1762         list_del_rcu(&sdata->list);
1763         mutex_unlock(&sdata->local->iflist_mtx);
1764 
1765         synchronize_rcu();
1766 
1767         if (sdata->dev) {
1768                 unregister_netdevice(sdata->dev);
1769         } else {
1770                 cfg80211_unregister_wdev(&sdata->wdev);
1771                 kfree(sdata);
1772         }
1773 }
1774 
1775 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1776 {
1777         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1778                 return;
1779         ieee80211_do_stop(sdata, true);
1780         ieee80211_teardown_sdata(sdata);
1781 }
1782 
1783 /*
1784  * Remove all interfaces, may only be called at hardware unregistration
1785  * time because it doesn't do RCU-safe list removals.
1786  */
1787 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1788 {
1789         struct ieee80211_sub_if_data *sdata, *tmp;
1790         LIST_HEAD(unreg_list);
1791         LIST_HEAD(wdev_list);
1792 
1793         ASSERT_RTNL();
1794 
1795         /*
1796          * Close all AP_VLAN interfaces first, as otherwise they
1797          * might be closed while the AP interface they belong to
1798          * is closed, causing unregister_netdevice_many() to crash.
1799          */
1800         list_for_each_entry(sdata, &local->interfaces, list)
1801                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1802                         dev_close(sdata->dev);
1803 
1804         mutex_lock(&local->iflist_mtx);
1805         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1806                 list_del(&sdata->list);
1807 
1808                 if (sdata->dev)
1809                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1810                 else
1811                         list_add(&sdata->list, &wdev_list);
1812         }
1813         mutex_unlock(&local->iflist_mtx);
1814         unregister_netdevice_many(&unreg_list);
1815 
1816         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1817                 list_del(&sdata->list);
1818                 cfg80211_unregister_wdev(&sdata->wdev);
1819                 kfree(sdata);
1820         }
1821 }
1822 
1823 static int netdev_notify(struct notifier_block *nb,
1824                          unsigned long state, void *ptr)
1825 {
1826         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1827         struct ieee80211_sub_if_data *sdata;
1828 
1829         if (state != NETDEV_CHANGENAME)
1830                 return NOTIFY_DONE;
1831 
1832         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1833                 return NOTIFY_DONE;
1834 
1835         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1836                 return NOTIFY_DONE;
1837 
1838         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1839         memcpy(sdata->name, dev->name, IFNAMSIZ);
1840         ieee80211_debugfs_rename_netdev(sdata);
1841 
1842         return NOTIFY_OK;
1843 }
1844 
1845 static struct notifier_block mac80211_netdev_notifier = {
1846         .notifier_call = netdev_notify,
1847 };
1848 
1849 int ieee80211_iface_init(void)
1850 {
1851         return register_netdevice_notifier(&mac80211_netdev_notifier);
1852 }
1853 
1854 void ieee80211_iface_exit(void)
1855 {
1856         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1857 }
1858 

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