Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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) ||
 80             (update_bss && ieee80211_sdata_running(sdata)))
 81                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 82 }
 83 
 84 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 85 {
 86         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 87                 return 0;
 88 
 89         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 90         return IEEE80211_CONF_CHANGE_IDLE;
 91 }
 92 
 93 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 94 {
 95         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 96                 return 0;
 97 
 98         ieee80211_flush_queues(local, NULL, false);
 99 
100         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
101         return IEEE80211_CONF_CHANGE_IDLE;
102 }
103 
104 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
105                                    bool force_active)
106 {
107         bool working, scanning, active;
108         unsigned int led_trig_start = 0, led_trig_stop = 0;
109 
110         lockdep_assert_held(&local->mtx);
111 
112         active = force_active ||
113                  !list_empty(&local->chanctx_list) ||
114                  local->monitors;
115 
116         working = !local->ops->remain_on_channel &&
117                   !list_empty(&local->roc_list);
118 
119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121 
122         if (working || scanning)
123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124         else
125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 
127         if (active)
128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129         else
130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 
132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133 
134         if (working || scanning || active)
135                 return __ieee80211_idle_off(local);
136         return __ieee80211_idle_on(local);
137 }
138 
139 u32 ieee80211_idle_off(struct ieee80211_local *local)
140 {
141         return __ieee80211_recalc_idle(local, true);
142 }
143 
144 void ieee80211_recalc_idle(struct ieee80211_local *local)
145 {
146         u32 change = __ieee80211_recalc_idle(local, false);
147         if (change)
148                 ieee80211_hw_config(local, change);
149 }
150 
151 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
152 {
153         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
154                 return -EINVAL;
155 
156         dev->mtu = new_mtu;
157         return 0;
158 }
159 
160 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
161                                 bool check_dup)
162 {
163         struct ieee80211_local *local = sdata->local;
164         struct ieee80211_sub_if_data *iter;
165         u64 new, mask, tmp;
166         u8 *m;
167         int ret = 0;
168 
169         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
170                 return 0;
171 
172         m = addr;
173         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176 
177         m = local->hw.wiphy->addr_mask;
178         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181 
182         if (!check_dup)
183                 return ret;
184 
185         mutex_lock(&local->iflist_mtx);
186         list_for_each_entry(iter, &local->interfaces, list) {
187                 if (iter == sdata)
188                         continue;
189 
190                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
191                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
192                         continue;
193 
194                 m = iter->vif.addr;
195                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
196                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
197                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
198 
199                 if ((new & ~mask) != (tmp & ~mask)) {
200                         ret = -EINVAL;
201                         break;
202                 }
203         }
204         mutex_unlock(&local->iflist_mtx);
205 
206         return ret;
207 }
208 
209 static int ieee80211_change_mac(struct net_device *dev, void *addr)
210 {
211         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
212         struct sockaddr *sa = addr;
213         bool check_dup = true;
214         int ret;
215 
216         if (ieee80211_sdata_running(sdata))
217                 return -EBUSY;
218 
219         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
220             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
221                 check_dup = false;
222 
223         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
224         if (ret)
225                 return ret;
226 
227         ret = eth_mac_addr(dev, sa);
228 
229         if (ret == 0)
230                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
231 
232         return ret;
233 }
234 
235 static inline int identical_mac_addr_allowed(int type1, int type2)
236 {
237         return type1 == NL80211_IFTYPE_MONITOR ||
238                 type2 == NL80211_IFTYPE_MONITOR ||
239                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
240                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
241                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
242                 (type1 == NL80211_IFTYPE_WDS &&
243                         (type2 == NL80211_IFTYPE_WDS ||
244                          type2 == NL80211_IFTYPE_AP)) ||
245                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
246                 (type1 == NL80211_IFTYPE_AP_VLAN &&
247                         (type2 == NL80211_IFTYPE_AP ||
248                          type2 == NL80211_IFTYPE_AP_VLAN));
249 }
250 
251 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
252                                             enum nl80211_iftype iftype)
253 {
254         struct ieee80211_local *local = sdata->local;
255         struct ieee80211_sub_if_data *nsdata;
256         int ret;
257 
258         ASSERT_RTNL();
259 
260         /* we hold the RTNL here so can safely walk the list */
261         list_for_each_entry(nsdata, &local->interfaces, list) {
262                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
263                         /*
264                          * Only OCB and monitor mode may coexist
265                          */
266                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
267                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
268                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
269                              nsdata->vif.type == NL80211_IFTYPE_OCB))
270                                 return -EBUSY;
271 
272                         /*
273                          * Allow only a single IBSS interface to be up at any
274                          * time. This is restricted because beacon distribution
275                          * cannot work properly if both are in the same IBSS.
276                          *
277                          * To remove this restriction we'd have to disallow them
278                          * from setting the same SSID on different IBSS interfaces
279                          * belonging to the same hardware. Then, however, we're
280                          * faced with having to adopt two different TSF timers...
281                          */
282                         if (iftype == NL80211_IFTYPE_ADHOC &&
283                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
284                                 return -EBUSY;
285                         /*
286                          * will not add another interface while any channel
287                          * switch is active.
288                          */
289                         if (nsdata->vif.csa_active)
290                                 return -EBUSY;
291 
292                         /*
293                          * The remaining checks are only performed for interfaces
294                          * with the same MAC address.
295                          */
296                         if (!ether_addr_equal(sdata->vif.addr,
297                                               nsdata->vif.addr))
298                                 continue;
299 
300                         /*
301                          * check whether it may have the same address
302                          */
303                         if (!identical_mac_addr_allowed(iftype,
304                                                         nsdata->vif.type))
305                                 return -ENOTUNIQ;
306 
307                         /*
308                          * can only add VLANs to enabled APs
309                          */
310                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
311                             nsdata->vif.type == NL80211_IFTYPE_AP)
312                                 sdata->bss = &nsdata->u.ap;
313                 }
314         }
315 
316         mutex_lock(&local->chanctx_mtx);
317         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
318         mutex_unlock(&local->chanctx_mtx);
319         return ret;
320 }
321 
322 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
323                                   enum nl80211_iftype iftype)
324 {
325         int n_queues = sdata->local->hw.queues;
326         int i;
327 
328         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
329                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
330                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
331                                          IEEE80211_INVAL_HW_QUEUE))
332                                 return -EINVAL;
333                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
334                                          n_queues))
335                                 return -EINVAL;
336                 }
337         }
338 
339         if ((iftype != NL80211_IFTYPE_AP &&
340              iftype != NL80211_IFTYPE_P2P_GO &&
341              iftype != NL80211_IFTYPE_MESH_POINT) ||
342             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
343                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
344                 return 0;
345         }
346 
347         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
348                 return -EINVAL;
349 
350         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
351                 return -EINVAL;
352 
353         return 0;
354 }
355 
356 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
357                                     const int offset)
358 {
359         struct ieee80211_local *local = sdata->local;
360         u32 flags = sdata->u.mntr_flags;
361 
362 #define ADJUST(_f, _s)  do {                                    \
363         if (flags & MONITOR_FLAG_##_f)                          \
364                 local->fif_##_s += offset;                      \
365         } while (0)
366 
367         ADJUST(FCSFAIL, fcsfail);
368         ADJUST(PLCPFAIL, plcpfail);
369         ADJUST(CONTROL, control);
370         ADJUST(CONTROL, pspoll);
371         ADJUST(OTHER_BSS, other_bss);
372 
373 #undef ADJUST
374 }
375 
376 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
377 {
378         struct ieee80211_local *local = sdata->local;
379         int i;
380 
381         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
382                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
383                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
384                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
385                         sdata->vif.hw_queue[i] = i;
386                 else
387                         sdata->vif.hw_queue[i] = 0;
388         }
389         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
390 }
391 
392 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
393 {
394         struct ieee80211_sub_if_data *sdata;
395         int ret;
396 
397         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
398                 return 0;
399 
400         ASSERT_RTNL();
401 
402         if (local->monitor_sdata)
403                 return 0;
404 
405         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
406         if (!sdata)
407                 return -ENOMEM;
408 
409         /* set up data */
410         sdata->local = local;
411         sdata->vif.type = NL80211_IFTYPE_MONITOR;
412         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
413                  wiphy_name(local->hw.wiphy));
414         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
415 
416         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
417 
418         ieee80211_set_default_queues(sdata);
419 
420         ret = drv_add_interface(local, sdata);
421         if (WARN_ON(ret)) {
422                 /* ok .. stupid driver, it asked for this! */
423                 kfree(sdata);
424                 return ret;
425         }
426 
427         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
428         if (ret) {
429                 kfree(sdata);
430                 return ret;
431         }
432 
433         mutex_lock(&local->iflist_mtx);
434         rcu_assign_pointer(local->monitor_sdata, sdata);
435         mutex_unlock(&local->iflist_mtx);
436 
437         mutex_lock(&local->mtx);
438         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
439                                         IEEE80211_CHANCTX_EXCLUSIVE);
440         mutex_unlock(&local->mtx);
441         if (ret) {
442                 mutex_lock(&local->iflist_mtx);
443                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
444                 mutex_unlock(&local->iflist_mtx);
445                 synchronize_net();
446                 drv_remove_interface(local, sdata);
447                 kfree(sdata);
448                 return ret;
449         }
450 
451         return 0;
452 }
453 
454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
455 {
456         struct ieee80211_sub_if_data *sdata;
457 
458         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
459                 return;
460 
461         ASSERT_RTNL();
462 
463         mutex_lock(&local->iflist_mtx);
464 
465         sdata = rcu_dereference_protected(local->monitor_sdata,
466                                           lockdep_is_held(&local->iflist_mtx));
467         if (!sdata) {
468                 mutex_unlock(&local->iflist_mtx);
469                 return;
470         }
471 
472         RCU_INIT_POINTER(local->monitor_sdata, NULL);
473         mutex_unlock(&local->iflist_mtx);
474 
475         synchronize_net();
476 
477         mutex_lock(&local->mtx);
478         ieee80211_vif_release_channel(sdata);
479         mutex_unlock(&local->mtx);
480 
481         drv_remove_interface(local, sdata);
482 
483         kfree(sdata);
484 }
485 
486 /*
487  * NOTE: Be very careful when changing this function, it must NOT return
488  * an error on interface type changes that have been pre-checked, so most
489  * checks should be in ieee80211_check_concurrent_iface.
490  */
491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
492 {
493         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
494         struct net_device *dev = wdev->netdev;
495         struct ieee80211_local *local = sdata->local;
496         struct sta_info *sta;
497         u32 changed = 0;
498         int res;
499         u32 hw_reconf_flags = 0;
500 
501         switch (sdata->vif.type) {
502         case NL80211_IFTYPE_WDS:
503                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
504                         return -ENOLINK;
505                 break;
506         case NL80211_IFTYPE_AP_VLAN: {
507                 struct ieee80211_sub_if_data *master;
508 
509                 if (!sdata->bss)
510                         return -ENOLINK;
511 
512                 mutex_lock(&local->mtx);
513                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
514                 mutex_unlock(&local->mtx);
515 
516                 master = container_of(sdata->bss,
517                                       struct ieee80211_sub_if_data, u.ap);
518                 sdata->control_port_protocol =
519                         master->control_port_protocol;
520                 sdata->control_port_no_encrypt =
521                         master->control_port_no_encrypt;
522                 sdata->vif.cab_queue = master->vif.cab_queue;
523                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524                        sizeof(sdata->vif.hw_queue));
525                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
526 
527                 mutex_lock(&local->key_mtx);
528                 sdata->crypto_tx_tailroom_needed_cnt +=
529                         master->crypto_tx_tailroom_needed_cnt;
530                 mutex_unlock(&local->key_mtx);
531 
532                 break;
533                 }
534         case NL80211_IFTYPE_AP:
535                 sdata->bss = &sdata->u.ap;
536                 break;
537         case NL80211_IFTYPE_MESH_POINT:
538         case NL80211_IFTYPE_STATION:
539         case NL80211_IFTYPE_MONITOR:
540         case NL80211_IFTYPE_ADHOC:
541         case NL80211_IFTYPE_P2P_DEVICE:
542         case NL80211_IFTYPE_OCB:
543                 /* no special treatment */
544                 break;
545         case NL80211_IFTYPE_UNSPECIFIED:
546         case NUM_NL80211_IFTYPES:
547         case NL80211_IFTYPE_P2P_CLIENT:
548         case NL80211_IFTYPE_P2P_GO:
549                 /* cannot happen */
550                 WARN_ON(1);
551                 break;
552         }
553 
554         if (local->open_count == 0) {
555                 res = drv_start(local);
556                 if (res)
557                         goto err_del_bss;
558                 /* we're brought up, everything changes */
559                 hw_reconf_flags = ~0;
560                 ieee80211_led_radio(local, true);
561                 ieee80211_mod_tpt_led_trig(local,
562                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
563         }
564 
565         /*
566          * Copy the hopefully now-present MAC address to
567          * this interface, if it has the special null one.
568          */
569         if (dev && is_zero_ether_addr(dev->dev_addr)) {
570                 memcpy(dev->dev_addr,
571                        local->hw.wiphy->perm_addr,
572                        ETH_ALEN);
573                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
574 
575                 if (!is_valid_ether_addr(dev->dev_addr)) {
576                         res = -EADDRNOTAVAIL;
577                         goto err_stop;
578                 }
579         }
580 
581         switch (sdata->vif.type) {
582         case NL80211_IFTYPE_AP_VLAN:
583                 /* no need to tell driver, but set carrier and chanctx */
584                 if (rtnl_dereference(sdata->bss->beacon)) {
585                         ieee80211_vif_vlan_copy_chanctx(sdata);
586                         netif_carrier_on(dev);
587                 } else {
588                         netif_carrier_off(dev);
589                 }
590                 break;
591         case NL80211_IFTYPE_MONITOR:
592                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
593                         local->cooked_mntrs++;
594                         break;
595                 }
596 
597                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
598                         res = drv_add_interface(local, sdata);
599                         if (res)
600                                 goto err_stop;
601                 } else if (local->monitors == 0 && local->open_count == 0) {
602                         res = ieee80211_add_virtual_monitor(local);
603                         if (res)
604                                 goto err_stop;
605                 }
606 
607                 /* must be before the call to ieee80211_configure_filter */
608                 local->monitors++;
609                 if (local->monitors == 1) {
610                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
611                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
612                 }
613 
614                 ieee80211_adjust_monitor_flags(sdata, 1);
615                 ieee80211_configure_filter(local);
616                 mutex_lock(&local->mtx);
617                 ieee80211_recalc_idle(local);
618                 mutex_unlock(&local->mtx);
619 
620                 netif_carrier_on(dev);
621                 break;
622         default:
623                 if (coming_up) {
624                         ieee80211_del_virtual_monitor(local);
625 
626                         res = drv_add_interface(local, sdata);
627                         if (res)
628                                 goto err_stop;
629                         res = ieee80211_check_queues(sdata,
630                                 ieee80211_vif_type_p2p(&sdata->vif));
631                         if (res)
632                                 goto err_del_interface;
633                 }
634 
635                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
636                         local->fif_pspoll++;
637                         local->fif_probe_req++;
638 
639                         ieee80211_configure_filter(local);
640                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
641                         local->fif_probe_req++;
642                 }
643 
644                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
645                         changed |= ieee80211_reset_erp_info(sdata);
646                 ieee80211_bss_info_change_notify(sdata, changed);
647 
648                 switch (sdata->vif.type) {
649                 case NL80211_IFTYPE_STATION:
650                 case NL80211_IFTYPE_ADHOC:
651                 case NL80211_IFTYPE_AP:
652                 case NL80211_IFTYPE_MESH_POINT:
653                 case NL80211_IFTYPE_OCB:
654                         netif_carrier_off(dev);
655                         break;
656                 case NL80211_IFTYPE_WDS:
657                 case NL80211_IFTYPE_P2P_DEVICE:
658                         break;
659                 default:
660                         /* not reached */
661                         WARN_ON(1);
662                 }
663 
664                 /*
665                  * Set default queue parameters so drivers don't
666                  * need to initialise the hardware if the hardware
667                  * doesn't start up with sane defaults.
668                  * Enable QoS for anything but station interfaces.
669                  */
670                 ieee80211_set_wmm_default(sdata, true,
671                         sdata->vif.type != NL80211_IFTYPE_STATION);
672         }
673 
674         set_bit(SDATA_STATE_RUNNING, &sdata->state);
675 
676         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
677                 /* Create STA entry for the WDS peer */
678                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
679                                      GFP_KERNEL);
680                 if (!sta) {
681                         res = -ENOMEM;
682                         goto err_del_interface;
683                 }
684 
685                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
686                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
687                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
688 
689                 res = sta_info_insert(sta);
690                 if (res) {
691                         /* STA has been freed */
692                         goto err_del_interface;
693                 }
694 
695                 rate_control_rate_init(sta);
696                 netif_carrier_on(dev);
697         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
698                 rcu_assign_pointer(local->p2p_sdata, sdata);
699         }
700 
701         /*
702          * set_multicast_list will be invoked by the networking core
703          * which will check whether any increments here were done in
704          * error and sync them down to the hardware as filter flags.
705          */
706         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
707                 atomic_inc(&local->iff_allmultis);
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);
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         struct fq *fq = &local->fq;
783         unsigned long flags;
784         struct sk_buff *skb, *tmp;
785         u32 hw_reconf_flags = 0;
786         int i, flushed;
787         struct ps_data *ps;
788         struct cfg80211_chan_def chandef;
789         bool cancel_scan;
790 
791         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
792 
793         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
794         if (cancel_scan)
795                 ieee80211_scan_cancel(local);
796 
797         /*
798          * Stop TX on this interface first.
799          */
800         if (sdata->dev)
801                 netif_tx_stop_all_queues(sdata->dev);
802 
803         ieee80211_roc_purge(local, sdata);
804 
805         switch (sdata->vif.type) {
806         case NL80211_IFTYPE_STATION:
807                 ieee80211_mgd_stop(sdata);
808                 break;
809         case NL80211_IFTYPE_ADHOC:
810                 ieee80211_ibss_stop(sdata);
811                 break;
812         case NL80211_IFTYPE_AP:
813                 cancel_work_sync(&sdata->u.ap.request_smps_work);
814                 break;
815         default:
816                 break;
817         }
818 
819         /*
820          * Remove all stations associated with this interface.
821          *
822          * This must be done before calling ops->remove_interface()
823          * because otherwise we can later invoke ops->sta_notify()
824          * whenever the STAs are removed, and that invalidates driver
825          * assumptions about always getting a vif pointer that is valid
826          * (because if we remove a STA after ops->remove_interface()
827          * the driver will have removed the vif info already!)
828          *
829          * In WDS mode a station must exist here and be flushed, for
830          * AP_VLANs stations may exist since there's nothing else that
831          * would have removed them, but in other modes there shouldn't
832          * be any stations.
833          */
834         flushed = sta_info_flush(sdata);
835         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
836                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
837                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
838 
839         /* don't count this interface for allmulti while it is down */
840         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
841                 atomic_dec(&local->iff_allmultis);
842 
843         if (sdata->vif.type == NL80211_IFTYPE_AP) {
844                 local->fif_pspoll--;
845                 local->fif_probe_req--;
846         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
847                 local->fif_probe_req--;
848         }
849 
850         if (sdata->dev) {
851                 netif_addr_lock_bh(sdata->dev);
852                 spin_lock_bh(&local->filter_lock);
853                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
854                                  sdata->dev->addr_len);
855                 spin_unlock_bh(&local->filter_lock);
856                 netif_addr_unlock_bh(sdata->dev);
857         }
858 
859         del_timer_sync(&local->dynamic_ps_timer);
860         cancel_work_sync(&local->dynamic_ps_enable_work);
861 
862         cancel_work_sync(&sdata->recalc_smps);
863         sdata_lock(sdata);
864         mutex_lock(&local->mtx);
865         sdata->vif.csa_active = false;
866         if (sdata->vif.type == NL80211_IFTYPE_STATION)
867                 sdata->u.mgd.csa_waiting_bcn = false;
868         if (sdata->csa_block_tx) {
869                 ieee80211_wake_vif_queues(local, sdata,
870                                           IEEE80211_QUEUE_STOP_REASON_CSA);
871                 sdata->csa_block_tx = false;
872         }
873         mutex_unlock(&local->mtx);
874         sdata_unlock(sdata);
875 
876         cancel_work_sync(&sdata->csa_finalize_work);
877 
878         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
879 
880         if (sdata->wdev.cac_started) {
881                 chandef = sdata->vif.bss_conf.chandef;
882                 WARN_ON(local->suspended);
883                 mutex_lock(&local->mtx);
884                 ieee80211_vif_release_channel(sdata);
885                 mutex_unlock(&local->mtx);
886                 cfg80211_cac_event(sdata->dev, &chandef,
887                                    NL80211_RADAR_CAC_ABORTED,
888                                    GFP_KERNEL);
889         }
890 
891         /* APs need special treatment */
892         if (sdata->vif.type == NL80211_IFTYPE_AP) {
893                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
894 
895                 /* down all dependent devices, that is VLANs */
896                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
897                                          u.vlan.list)
898                         dev_close(vlan->dev);
899                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
900         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
901                 /* remove all packets in parent bc_buf pointing to this dev */
902                 ps = &sdata->bss->ps;
903 
904                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
905                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
906                         if (skb->dev == sdata->dev) {
907                                 __skb_unlink(skb, &ps->bc_buf);
908                                 local->total_ps_buffered--;
909                                 ieee80211_free_txskb(&local->hw, skb);
910                         }
911                 }
912                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
913         }
914 
915         if (going_down)
916                 local->open_count--;
917 
918         switch (sdata->vif.type) {
919         case NL80211_IFTYPE_AP_VLAN:
920                 mutex_lock(&local->mtx);
921                 list_del(&sdata->u.vlan.list);
922                 mutex_unlock(&local->mtx);
923                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
924                 /* see comment in the default case below */
925                 ieee80211_free_keys(sdata, true);
926                 /* no need to tell driver */
927                 break;
928         case NL80211_IFTYPE_MONITOR:
929                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
930                         local->cooked_mntrs--;
931                         break;
932                 }
933 
934                 local->monitors--;
935                 if (local->monitors == 0) {
936                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
937                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
938                 }
939 
940                 ieee80211_adjust_monitor_flags(sdata, -1);
941                 break;
942         case NL80211_IFTYPE_P2P_DEVICE:
943                 /* relies on synchronize_rcu() below */
944                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
945                 /* fall through */
946         default:
947                 cancel_work_sync(&sdata->work);
948                 /*
949                  * When we get here, the interface is marked down.
950                  * Free the remaining keys, if there are any
951                  * (which can happen in AP mode if userspace sets
952                  * keys before the interface is operating, and maybe
953                  * also in WDS mode)
954                  *
955                  * Force the key freeing to always synchronize_net()
956                  * to wait for the RX path in case it is using this
957                  * interface enqueuing frames at this very time on
958                  * another CPU.
959                  */
960                 ieee80211_free_keys(sdata, true);
961                 skb_queue_purge(&sdata->skb_queue);
962         }
963 
964         sdata->bss = NULL;
965 
966         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
967         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
968                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
969                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
970                         if (info->control.vif == &sdata->vif) {
971                                 __skb_unlink(skb, &local->pending[i]);
972                                 ieee80211_free_txskb(&local->hw, skb);
973                         }
974                 }
975         }
976         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
977 
978         if (sdata->vif.txq) {
979                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
980 
981                 spin_lock_bh(&fq->lock);
982                 ieee80211_txq_purge(local, txqi);
983                 spin_unlock_bh(&fq->lock);
984         }
985 
986         if (local->open_count == 0)
987                 ieee80211_clear_tx_pending(local);
988 
989         /*
990          * If the interface goes down while suspended, presumably because
991          * the device was unplugged and that happens before our resume,
992          * then the driver is already unconfigured and the remainder of
993          * this function isn't needed.
994          * XXX: what about WoWLAN? If the device has software state, e.g.
995          *      memory allocated, it might expect teardown commands from
996          *      mac80211 here?
997          */
998         if (local->suspended) {
999                 WARN_ON(local->wowlan);
1000                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1001                 return;
1002         }
1003 
1004         switch (sdata->vif.type) {
1005         case NL80211_IFTYPE_AP_VLAN:
1006                 break;
1007         case NL80211_IFTYPE_MONITOR:
1008                 if (local->monitors == 0)
1009                         ieee80211_del_virtual_monitor(local);
1010 
1011                 mutex_lock(&local->mtx);
1012                 ieee80211_recalc_idle(local);
1013                 mutex_unlock(&local->mtx);
1014 
1015                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1016                         break;
1017 
1018                 /* fall through */
1019         default:
1020                 if (going_down)
1021                         drv_remove_interface(local, sdata);
1022         }
1023 
1024         ieee80211_recalc_ps(local);
1025 
1026         if (cancel_scan)
1027                 flush_delayed_work(&local->scan_work);
1028 
1029         if (local->open_count == 0) {
1030                 ieee80211_stop_device(local);
1031 
1032                 /* no reconfiguring after stop! */
1033                 return;
1034         }
1035 
1036         /* do after stop to avoid reconfiguring when we stop anyway */
1037         ieee80211_configure_filter(local);
1038         ieee80211_hw_config(local, hw_reconf_flags);
1039 
1040         if (local->monitors == local->open_count)
1041                 ieee80211_add_virtual_monitor(local);
1042 }
1043 
1044 static int ieee80211_stop(struct net_device *dev)
1045 {
1046         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1047 
1048         ieee80211_do_stop(sdata, true);
1049 
1050         return 0;
1051 }
1052 
1053 static void ieee80211_set_multicast_list(struct net_device *dev)
1054 {
1055         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1056         struct ieee80211_local *local = sdata->local;
1057         int allmulti, sdata_allmulti;
1058 
1059         allmulti = !!(dev->flags & IFF_ALLMULTI);
1060         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1061 
1062         if (allmulti != sdata_allmulti) {
1063                 if (dev->flags & IFF_ALLMULTI)
1064                         atomic_inc(&local->iff_allmultis);
1065                 else
1066                         atomic_dec(&local->iff_allmultis);
1067                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1068         }
1069 
1070         spin_lock_bh(&local->filter_lock);
1071         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1072         spin_unlock_bh(&local->filter_lock);
1073         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1074 }
1075 
1076 /*
1077  * Called when the netdev is removed or, by the code below, before
1078  * the interface type changes.
1079  */
1080 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1081 {
1082         int i;
1083 
1084         /* free extra data */
1085         ieee80211_free_keys(sdata, false);
1086 
1087         ieee80211_debugfs_remove_netdev(sdata);
1088 
1089         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1090                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1091         sdata->fragment_next = 0;
1092 
1093         if (ieee80211_vif_is_mesh(&sdata->vif))
1094                 ieee80211_mesh_teardown_sdata(sdata);
1095 }
1096 
1097 static void ieee80211_uninit(struct net_device *dev)
1098 {
1099         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1100 }
1101 
1102 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1103                                          struct sk_buff *skb,
1104                                          void *accel_priv,
1105                                          select_queue_fallback_t fallback)
1106 {
1107         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1108 }
1109 
1110 static struct rtnl_link_stats64 *
1111 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1112 {
1113         int i;
1114 
1115         for_each_possible_cpu(i) {
1116                 const struct pcpu_sw_netstats *tstats;
1117                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1118                 unsigned int start;
1119 
1120                 tstats = per_cpu_ptr(dev->tstats, i);
1121 
1122                 do {
1123                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1124                         rx_packets = tstats->rx_packets;
1125                         tx_packets = tstats->tx_packets;
1126                         rx_bytes = tstats->rx_bytes;
1127                         tx_bytes = tstats->tx_bytes;
1128                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1129 
1130                 stats->rx_packets += rx_packets;
1131                 stats->tx_packets += tx_packets;
1132                 stats->rx_bytes   += rx_bytes;
1133                 stats->tx_bytes   += tx_bytes;
1134         }
1135 
1136         return stats;
1137 }
1138 
1139 static const struct net_device_ops ieee80211_dataif_ops = {
1140         .ndo_open               = ieee80211_open,
1141         .ndo_stop               = ieee80211_stop,
1142         .ndo_uninit             = ieee80211_uninit,
1143         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1144         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1145         .ndo_change_mtu         = ieee80211_change_mtu,
1146         .ndo_set_mac_address    = ieee80211_change_mac,
1147         .ndo_select_queue       = ieee80211_netdev_select_queue,
1148         .ndo_get_stats64        = ieee80211_get_stats64,
1149 };
1150 
1151 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1152                                           struct sk_buff *skb,
1153                                           void *accel_priv,
1154                                           select_queue_fallback_t fallback)
1155 {
1156         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1157         struct ieee80211_local *local = sdata->local;
1158         struct ieee80211_hdr *hdr;
1159         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1160 
1161         if (local->hw.queues < IEEE80211_NUM_ACS)
1162                 return 0;
1163 
1164         if (skb->len < 4 ||
1165             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1166                 return 0; /* doesn't matter, frame will be dropped */
1167 
1168         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1169 
1170         return ieee80211_select_queue_80211(sdata, skb, hdr);
1171 }
1172 
1173 static const struct net_device_ops ieee80211_monitorif_ops = {
1174         .ndo_open               = ieee80211_open,
1175         .ndo_stop               = ieee80211_stop,
1176         .ndo_uninit             = ieee80211_uninit,
1177         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1178         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1179         .ndo_change_mtu         = ieee80211_change_mtu,
1180         .ndo_set_mac_address    = ieee80211_change_mac,
1181         .ndo_select_queue       = ieee80211_monitor_select_queue,
1182         .ndo_get_stats64        = ieee80211_get_stats64,
1183 };
1184 
1185 static void ieee80211_if_free(struct net_device *dev)
1186 {
1187         free_percpu(dev->tstats);
1188         free_netdev(dev);
1189 }
1190 
1191 static void ieee80211_if_setup(struct net_device *dev)
1192 {
1193         ether_setup(dev);
1194         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1195         dev->netdev_ops = &ieee80211_dataif_ops;
1196         dev->destructor = ieee80211_if_free;
1197 }
1198 
1199 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1200 {
1201         ieee80211_if_setup(dev);
1202         dev->priv_flags |= IFF_NO_QUEUE;
1203 }
1204 
1205 static void ieee80211_iface_work(struct work_struct *work)
1206 {
1207         struct ieee80211_sub_if_data *sdata =
1208                 container_of(work, struct ieee80211_sub_if_data, work);
1209         struct ieee80211_local *local = sdata->local;
1210         struct sk_buff *skb;
1211         struct sta_info *sta;
1212         struct ieee80211_ra_tid *ra_tid;
1213         struct ieee80211_rx_agg *rx_agg;
1214 
1215         if (!ieee80211_sdata_running(sdata))
1216                 return;
1217 
1218         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1219                 return;
1220 
1221         if (!ieee80211_can_run_worker(local))
1222                 return;
1223 
1224         /* first process frames */
1225         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1226                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1227 
1228                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1229                         ra_tid = (void *)&skb->cb;
1230                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1231                                                  ra_tid->tid);
1232                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1233                         ra_tid = (void *)&skb->cb;
1234                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1235                                                 ra_tid->tid);
1236                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1237                         rx_agg = (void *)&skb->cb;
1238                         mutex_lock(&local->sta_mtx);
1239                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1240                         if (sta)
1241                                 __ieee80211_start_rx_ba_session(sta,
1242                                                 0, 0, 0, 1, rx_agg->tid,
1243                                                 IEEE80211_MAX_AMPDU_BUF,
1244                                                 false, true);
1245                         mutex_unlock(&local->sta_mtx);
1246                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1247                         rx_agg = (void *)&skb->cb;
1248                         mutex_lock(&local->sta_mtx);
1249                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1250                         if (sta)
1251                                 __ieee80211_stop_rx_ba_session(sta,
1252                                                         rx_agg->tid,
1253                                                         WLAN_BACK_RECIPIENT, 0,
1254                                                         false);
1255                         mutex_unlock(&local->sta_mtx);
1256                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1257                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1258                         int len = skb->len;
1259 
1260                         mutex_lock(&local->sta_mtx);
1261                         sta = sta_info_get_bss(sdata, mgmt->sa);
1262                         if (sta) {
1263                                 switch (mgmt->u.action.u.addba_req.action_code) {
1264                                 case WLAN_ACTION_ADDBA_REQ:
1265                                         ieee80211_process_addba_request(
1266                                                         local, sta, mgmt, len);
1267                                         break;
1268                                 case WLAN_ACTION_ADDBA_RESP:
1269                                         ieee80211_process_addba_resp(local, sta,
1270                                                                      mgmt, len);
1271                                         break;
1272                                 case WLAN_ACTION_DELBA:
1273                                         ieee80211_process_delba(sdata, sta,
1274                                                                 mgmt, len);
1275                                         break;
1276                                 default:
1277                                         WARN_ON(1);
1278                                         break;
1279                                 }
1280                         }
1281                         mutex_unlock(&local->sta_mtx);
1282                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1283                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1284                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1285                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1286                                 ieee80211_process_mu_groups(sdata, mgmt);
1287                                 break;
1288                         default:
1289                                 WARN_ON(1);
1290                                 break;
1291                         }
1292                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1293                         struct ieee80211_hdr *hdr = (void *)mgmt;
1294                         /*
1295                          * So the frame isn't mgmt, but frame_control
1296                          * is at the right place anyway, of course, so
1297                          * the if statement is correct.
1298                          *
1299                          * Warn if we have other data frame types here,
1300                          * they must not get here.
1301                          */
1302                         WARN_ON(hdr->frame_control &
1303                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1304                         WARN_ON(!(hdr->seq_ctrl &
1305                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1306                         /*
1307                          * This was a fragment of a frame, received while
1308                          * a block-ack session was active. That cannot be
1309                          * right, so terminate the session.
1310                          */
1311                         mutex_lock(&local->sta_mtx);
1312                         sta = sta_info_get_bss(sdata, mgmt->sa);
1313                         if (sta) {
1314                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1315                                                 IEEE80211_QOS_CTL_TID_MASK;
1316 
1317                                 __ieee80211_stop_rx_ba_session(
1318                                         sta, tid, WLAN_BACK_RECIPIENT,
1319                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1320                                         true);
1321                         }
1322                         mutex_unlock(&local->sta_mtx);
1323                 } else switch (sdata->vif.type) {
1324                 case NL80211_IFTYPE_STATION:
1325                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1326                         break;
1327                 case NL80211_IFTYPE_ADHOC:
1328                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1329                         break;
1330                 case NL80211_IFTYPE_MESH_POINT:
1331                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1332                                 break;
1333                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1334                         break;
1335                 default:
1336                         WARN(1, "frame for unexpected interface type");
1337                         break;
1338                 }
1339 
1340                 kfree_skb(skb);
1341         }
1342 
1343         /* then other type-dependent work */
1344         switch (sdata->vif.type) {
1345         case NL80211_IFTYPE_STATION:
1346                 ieee80211_sta_work(sdata);
1347                 break;
1348         case NL80211_IFTYPE_ADHOC:
1349                 ieee80211_ibss_work(sdata);
1350                 break;
1351         case NL80211_IFTYPE_MESH_POINT:
1352                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1353                         break;
1354                 ieee80211_mesh_work(sdata);
1355                 break;
1356         case NL80211_IFTYPE_OCB:
1357                 ieee80211_ocb_work(sdata);
1358                 break;
1359         default:
1360                 break;
1361         }
1362 }
1363 
1364 static void ieee80211_recalc_smps_work(struct work_struct *work)
1365 {
1366         struct ieee80211_sub_if_data *sdata =
1367                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1368 
1369         ieee80211_recalc_smps(sdata);
1370 }
1371 
1372 /*
1373  * Helper function to initialise an interface to a specific type.
1374  */
1375 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1376                                   enum nl80211_iftype type)
1377 {
1378         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1379                                                     0xff, 0xff, 0xff};
1380 
1381         /* clear type-dependent union */
1382         memset(&sdata->u, 0, sizeof(sdata->u));
1383 
1384         /* and set some type-dependent values */
1385         sdata->vif.type = type;
1386         sdata->vif.p2p = false;
1387         sdata->wdev.iftype = type;
1388 
1389         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1390         sdata->control_port_no_encrypt = false;
1391         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1392         sdata->vif.bss_conf.idle = true;
1393 
1394         sdata->noack_map = 0;
1395 
1396         /* only monitor/p2p-device differ */
1397         if (sdata->dev) {
1398                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1399                 sdata->dev->type = ARPHRD_ETHER;
1400         }
1401 
1402         skb_queue_head_init(&sdata->skb_queue);
1403         INIT_WORK(&sdata->work, ieee80211_iface_work);
1404         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1405         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1406         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1407         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1408 
1409         switch (type) {
1410         case NL80211_IFTYPE_P2P_GO:
1411                 type = NL80211_IFTYPE_AP;
1412                 sdata->vif.type = type;
1413                 sdata->vif.p2p = true;
1414                 /* fall through */
1415         case NL80211_IFTYPE_AP:
1416                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1417                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1418                 INIT_WORK(&sdata->u.ap.request_smps_work,
1419                           ieee80211_request_smps_ap_work);
1420                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1421                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1422                 break;
1423         case NL80211_IFTYPE_P2P_CLIENT:
1424                 type = NL80211_IFTYPE_STATION;
1425                 sdata->vif.type = type;
1426                 sdata->vif.p2p = true;
1427                 /* fall through */
1428         case NL80211_IFTYPE_STATION:
1429                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1430                 ieee80211_sta_setup_sdata(sdata);
1431                 break;
1432         case NL80211_IFTYPE_OCB:
1433                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1434                 ieee80211_ocb_setup_sdata(sdata);
1435                 break;
1436         case NL80211_IFTYPE_ADHOC:
1437                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1438                 ieee80211_ibss_setup_sdata(sdata);
1439                 break;
1440         case NL80211_IFTYPE_MESH_POINT:
1441                 if (ieee80211_vif_is_mesh(&sdata->vif))
1442                         ieee80211_mesh_init_sdata(sdata);
1443                 break;
1444         case NL80211_IFTYPE_MONITOR:
1445                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1446                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1447                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1448                                       MONITOR_FLAG_OTHER_BSS;
1449                 break;
1450         case NL80211_IFTYPE_WDS:
1451                 sdata->vif.bss_conf.bssid = NULL;
1452                 break;
1453         case NL80211_IFTYPE_AP_VLAN:
1454         case NL80211_IFTYPE_P2P_DEVICE:
1455                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1456                 break;
1457         case NL80211_IFTYPE_UNSPECIFIED:
1458         case NUM_NL80211_IFTYPES:
1459                 BUG();
1460                 break;
1461         }
1462 
1463         ieee80211_debugfs_add_netdev(sdata);
1464 }
1465 
1466 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1467                                            enum nl80211_iftype type)
1468 {
1469         struct ieee80211_local *local = sdata->local;
1470         int ret, err;
1471         enum nl80211_iftype internal_type = type;
1472         bool p2p = false;
1473 
1474         ASSERT_RTNL();
1475 
1476         if (!local->ops->change_interface)
1477                 return -EBUSY;
1478 
1479         switch (sdata->vif.type) {
1480         case NL80211_IFTYPE_AP:
1481         case NL80211_IFTYPE_STATION:
1482         case NL80211_IFTYPE_ADHOC:
1483         case NL80211_IFTYPE_OCB:
1484                 /*
1485                  * Could maybe also all others here?
1486                  * Just not sure how that interacts
1487                  * with the RX/config path e.g. for
1488                  * mesh.
1489                  */
1490                 break;
1491         default:
1492                 return -EBUSY;
1493         }
1494 
1495         switch (type) {
1496         case NL80211_IFTYPE_AP:
1497         case NL80211_IFTYPE_STATION:
1498         case NL80211_IFTYPE_ADHOC:
1499         case NL80211_IFTYPE_OCB:
1500                 /*
1501                  * Could probably support everything
1502                  * but WDS here (WDS do_open can fail
1503                  * under memory pressure, which this
1504                  * code isn't prepared to handle).
1505                  */
1506                 break;
1507         case NL80211_IFTYPE_P2P_CLIENT:
1508                 p2p = true;
1509                 internal_type = NL80211_IFTYPE_STATION;
1510                 break;
1511         case NL80211_IFTYPE_P2P_GO:
1512                 p2p = true;
1513                 internal_type = NL80211_IFTYPE_AP;
1514                 break;
1515         default:
1516                 return -EBUSY;
1517         }
1518 
1519         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1520         if (ret)
1521                 return ret;
1522 
1523         ieee80211_do_stop(sdata, false);
1524 
1525         ieee80211_teardown_sdata(sdata);
1526 
1527         ret = drv_change_interface(local, sdata, internal_type, p2p);
1528         if (ret)
1529                 type = ieee80211_vif_type_p2p(&sdata->vif);
1530 
1531         /*
1532          * Ignore return value here, there's not much we can do since
1533          * the driver changed the interface type internally already.
1534          * The warnings will hopefully make driver authors fix it :-)
1535          */
1536         ieee80211_check_queues(sdata, type);
1537 
1538         ieee80211_setup_sdata(sdata, type);
1539 
1540         err = ieee80211_do_open(&sdata->wdev, false);
1541         WARN(err, "type change: do_open returned %d", err);
1542 
1543         return ret;
1544 }
1545 
1546 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1547                              enum nl80211_iftype type)
1548 {
1549         int ret;
1550 
1551         ASSERT_RTNL();
1552 
1553         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1554                 return 0;
1555 
1556         if (ieee80211_sdata_running(sdata)) {
1557                 ret = ieee80211_runtime_change_iftype(sdata, type);
1558                 if (ret)
1559                         return ret;
1560         } else {
1561                 /* Purge and reset type-dependent state. */
1562                 ieee80211_teardown_sdata(sdata);
1563                 ieee80211_setup_sdata(sdata, type);
1564         }
1565 
1566         /* reset some values that shouldn't be kept across type changes */
1567         if (type == NL80211_IFTYPE_STATION)
1568                 sdata->u.mgd.use_4addr = false;
1569 
1570         return 0;
1571 }
1572 
1573 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1574                                        u8 *perm_addr, enum nl80211_iftype type)
1575 {
1576         struct ieee80211_sub_if_data *sdata;
1577         u64 mask, start, addr, val, inc;
1578         u8 *m;
1579         u8 tmp_addr[ETH_ALEN];
1580         int i;
1581 
1582         /* default ... something at least */
1583         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1584 
1585         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1586             local->hw.wiphy->n_addresses <= 1)
1587                 return;
1588 
1589         mutex_lock(&local->iflist_mtx);
1590 
1591         switch (type) {
1592         case NL80211_IFTYPE_MONITOR:
1593                 /* doesn't matter */
1594                 break;
1595         case NL80211_IFTYPE_WDS:
1596         case NL80211_IFTYPE_AP_VLAN:
1597                 /* match up with an AP interface */
1598                 list_for_each_entry(sdata, &local->interfaces, list) {
1599                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1600                                 continue;
1601                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1602                         break;
1603                 }
1604                 /* keep default if no AP interface present */
1605                 break;
1606         case NL80211_IFTYPE_P2P_CLIENT:
1607         case NL80211_IFTYPE_P2P_GO:
1608                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1609                         list_for_each_entry(sdata, &local->interfaces, list) {
1610                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1611                                         continue;
1612                                 if (!ieee80211_sdata_running(sdata))
1613                                         continue;
1614                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1615                                 goto out_unlock;
1616                         }
1617                 }
1618                 /* otherwise fall through */
1619         default:
1620                 /* assign a new address if possible -- try n_addresses first */
1621                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1622                         bool used = false;
1623 
1624                         list_for_each_entry(sdata, &local->interfaces, list) {
1625                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1626                                                      sdata->vif.addr)) {
1627                                         used = true;
1628                                         break;
1629                                 }
1630                         }
1631 
1632                         if (!used) {
1633                                 memcpy(perm_addr,
1634                                        local->hw.wiphy->addresses[i].addr,
1635                                        ETH_ALEN);
1636                                 break;
1637                         }
1638                 }
1639 
1640                 /* try mask if available */
1641                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1642                         break;
1643 
1644                 m = local->hw.wiphy->addr_mask;
1645                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1646                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1647                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1648 
1649                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1650                         /* not a contiguous mask ... not handled now! */
1651                         pr_info("not contiguous\n");
1652                         break;
1653                 }
1654 
1655                 /*
1656                  * Pick address of existing interface in case user changed
1657                  * MAC address manually, default to perm_addr.
1658                  */
1659                 m = local->hw.wiphy->perm_addr;
1660                 list_for_each_entry(sdata, &local->interfaces, list) {
1661                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1662                                 continue;
1663                         m = sdata->vif.addr;
1664                         break;
1665                 }
1666                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1667                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1668                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1669 
1670                 inc = 1ULL<<__ffs64(mask);
1671                 val = (start & mask);
1672                 addr = (start & ~mask) | (val & mask);
1673                 do {
1674                         bool used = false;
1675 
1676                         tmp_addr[5] = addr >> 0*8;
1677                         tmp_addr[4] = addr >> 1*8;
1678                         tmp_addr[3] = addr >> 2*8;
1679                         tmp_addr[2] = addr >> 3*8;
1680                         tmp_addr[1] = addr >> 4*8;
1681                         tmp_addr[0] = addr >> 5*8;
1682 
1683                         val += inc;
1684 
1685                         list_for_each_entry(sdata, &local->interfaces, list) {
1686                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1687                                         used = true;
1688                                         break;
1689                                 }
1690                         }
1691 
1692                         if (!used) {
1693                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1694                                 break;
1695                         }
1696                         addr = (start & ~mask) | (val & mask);
1697                 } while (addr != start);
1698 
1699                 break;
1700         }
1701 
1702  out_unlock:
1703         mutex_unlock(&local->iflist_mtx);
1704 }
1705 
1706 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1707                      unsigned char name_assign_type,
1708                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1709                      struct vif_params *params)
1710 {
1711         struct net_device *ndev = NULL;
1712         struct ieee80211_sub_if_data *sdata = NULL;
1713         struct txq_info *txqi;
1714         void (*if_setup)(struct net_device *dev);
1715         int ret, i;
1716         int txqs = 1;
1717 
1718         ASSERT_RTNL();
1719 
1720         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1721                 struct wireless_dev *wdev;
1722 
1723                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1724                                 GFP_KERNEL);
1725                 if (!sdata)
1726                         return -ENOMEM;
1727                 wdev = &sdata->wdev;
1728 
1729                 sdata->dev = NULL;
1730                 strlcpy(sdata->name, name, IFNAMSIZ);
1731                 ieee80211_assign_perm_addr(local, wdev->address, type);
1732                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1733         } else {
1734                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1735                                  sizeof(void *));
1736                 int txq_size = 0;
1737 
1738                 if (local->ops->wake_tx_queue)
1739                         txq_size += sizeof(struct txq_info) +
1740                                     local->hw.txq_data_size;
1741 
1742                 if (local->ops->wake_tx_queue)
1743                         if_setup = ieee80211_if_setup_no_queue;
1744                 else
1745                         if_setup = ieee80211_if_setup;
1746 
1747                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1748                         txqs = IEEE80211_NUM_ACS;
1749 
1750                 ndev = alloc_netdev_mqs(size + txq_size,
1751                                         name, name_assign_type,
1752                                         if_setup, txqs, 1);
1753                 if (!ndev)
1754                         return -ENOMEM;
1755                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1756 
1757                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1758                 if (!ndev->tstats) {
1759                         free_netdev(ndev);
1760                         return -ENOMEM;
1761                 }
1762 
1763                 ndev->needed_headroom = local->tx_headroom +
1764                                         4*6 /* four MAC addresses */
1765                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1766                                         + 6 /* mesh */
1767                                         + 8 /* rfc1042/bridge tunnel */
1768                                         - ETH_HLEN /* ethernet hard_header_len */
1769                                         + IEEE80211_ENCRYPT_HEADROOM;
1770                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1771 
1772                 ret = dev_alloc_name(ndev, ndev->name);
1773                 if (ret < 0) {
1774                         ieee80211_if_free(ndev);
1775                         return ret;
1776                 }
1777 
1778                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1779                 if (params && is_valid_ether_addr(params->macaddr))
1780                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1781                 else
1782                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1783                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1784 
1785                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1786                 sdata = netdev_priv(ndev);
1787                 ndev->ieee80211_ptr = &sdata->wdev;
1788                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1789                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1790 
1791                 if (txq_size) {
1792                         txqi = netdev_priv(ndev) + size;
1793                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1794                 }
1795 
1796                 sdata->dev = ndev;
1797         }
1798 
1799         /* initialise type-independent data */
1800         sdata->wdev.wiphy = local->hw.wiphy;
1801         sdata->local = local;
1802 
1803         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1804                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1805 
1806         INIT_LIST_HEAD(&sdata->key_list);
1807 
1808         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1809                           ieee80211_dfs_cac_timer_work);
1810         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1811                           ieee80211_delayed_tailroom_dec);
1812 
1813         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1814                 struct ieee80211_supported_band *sband;
1815                 sband = local->hw.wiphy->bands[i];
1816                 sdata->rc_rateidx_mask[i] =
1817                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1818                 if (sband) {
1819                         __le16 cap;
1820                         u16 *vht_rate_mask;
1821 
1822                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1823                                sband->ht_cap.mcs.rx_mask,
1824                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1825 
1826                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1827                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1828                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1829                 } else {
1830                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1831                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1832                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1833                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1834                 }
1835         }
1836 
1837         ieee80211_set_default_queues(sdata);
1838 
1839         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1840         sdata->user_power_level = local->user_power_level;
1841 
1842         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1843 
1844         /* setup type-dependent data */
1845         ieee80211_setup_sdata(sdata, type);
1846 
1847         if (ndev) {
1848                 if (params) {
1849                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1850                         if (type == NL80211_IFTYPE_STATION)
1851                                 sdata->u.mgd.use_4addr = params->use_4addr;
1852                 }
1853 
1854                 ndev->features |= local->hw.netdev_features;
1855 
1856                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1857 
1858                 ret = register_netdevice(ndev);
1859                 if (ret) {
1860                         ieee80211_if_free(ndev);
1861                         return ret;
1862                 }
1863         }
1864 
1865         mutex_lock(&local->iflist_mtx);
1866         list_add_tail_rcu(&sdata->list, &local->interfaces);
1867         mutex_unlock(&local->iflist_mtx);
1868 
1869         if (new_wdev)
1870                 *new_wdev = &sdata->wdev;
1871 
1872         return 0;
1873 }
1874 
1875 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1876 {
1877         ASSERT_RTNL();
1878 
1879         mutex_lock(&sdata->local->iflist_mtx);
1880         list_del_rcu(&sdata->list);
1881         mutex_unlock(&sdata->local->iflist_mtx);
1882 
1883         synchronize_rcu();
1884 
1885         if (sdata->dev) {
1886                 unregister_netdevice(sdata->dev);
1887         } else {
1888                 cfg80211_unregister_wdev(&sdata->wdev);
1889                 ieee80211_teardown_sdata(sdata);
1890                 kfree(sdata);
1891         }
1892 }
1893 
1894 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1895 {
1896         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1897                 return;
1898         ieee80211_do_stop(sdata, true);
1899 }
1900 
1901 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1902 {
1903         struct ieee80211_sub_if_data *sdata, *tmp;
1904         LIST_HEAD(unreg_list);
1905         LIST_HEAD(wdev_list);
1906 
1907         ASSERT_RTNL();
1908 
1909         /* Before destroying the interfaces, make sure they're all stopped so
1910          * that the hardware is stopped. Otherwise, the driver might still be
1911          * iterating the interfaces during the shutdown, e.g. from a worker
1912          * or from RX processing or similar, and if it does so (using atomic
1913          * iteration) while we're manipulating the list, the iteration will
1914          * crash.
1915          *
1916          * After this, the hardware should be stopped and the driver should
1917          * have stopped all of its activities, so that we can do RCU-unaware
1918          * manipulations of the interface list below.
1919          */
1920         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1921 
1922         WARN(local->open_count, "%s: open count remains %d\n",
1923              wiphy_name(local->hw.wiphy), local->open_count);
1924 
1925         mutex_lock(&local->iflist_mtx);
1926         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1927                 list_del(&sdata->list);
1928 
1929                 if (sdata->dev)
1930                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1931                 else
1932                         list_add(&sdata->list, &wdev_list);
1933         }
1934         mutex_unlock(&local->iflist_mtx);
1935         unregister_netdevice_many(&unreg_list);
1936 
1937         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1938                 list_del(&sdata->list);
1939                 cfg80211_unregister_wdev(&sdata->wdev);
1940                 kfree(sdata);
1941         }
1942 }
1943 
1944 static int netdev_notify(struct notifier_block *nb,
1945                          unsigned long state, void *ptr)
1946 {
1947         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1948         struct ieee80211_sub_if_data *sdata;
1949 
1950         if (state != NETDEV_CHANGENAME)
1951                 return NOTIFY_DONE;
1952 
1953         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1954                 return NOTIFY_DONE;
1955 
1956         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1957                 return NOTIFY_DONE;
1958 
1959         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1960         memcpy(sdata->name, dev->name, IFNAMSIZ);
1961         ieee80211_debugfs_rename_netdev(sdata);
1962 
1963         return NOTIFY_OK;
1964 }
1965 
1966 static struct notifier_block mac80211_netdev_notifier = {
1967         .notifier_call = netdev_notify,
1968 };
1969 
1970 int ieee80211_iface_init(void)
1971 {
1972         return register_netdevice_notifier(&mac80211_netdev_notifier);
1973 }
1974 
1975 void ieee80211_iface_exit(void)
1976 {
1977         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1978 }
1979 

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