Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/net/mac80211/iface.c

  1 /*
  2  * Interface handling
  3  *
  4  * Copyright 2002-2005, Instant802 Networks, Inc.
  5  * Copyright 2005-2006, Devicescape Software, Inc.
  6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  8  * Copyright 2013-2014  Intel Mobile Communications GmbH
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  */
 14 #include <linux/slab.h>
 15 #include <linux/kernel.h>
 16 #include <linux/if_arp.h>
 17 #include <linux/netdevice.h>
 18 #include <linux/rtnetlink.h>
 19 #include <net/mac80211.h>
 20 #include <net/ieee80211_radiotap.h>
 21 #include "ieee80211_i.h"
 22 #include "sta_info.h"
 23 #include "debugfs_netdev.h"
 24 #include "mesh.h"
 25 #include "led.h"
 26 #include "driver-ops.h"
 27 #include "wme.h"
 28 #include "rate.h"
 29 
 30 /**
 31  * DOC: Interface list locking
 32  *
 33  * The interface list in each struct ieee80211_local is protected
 34  * three-fold:
 35  *
 36  * (1) modifications may only be done under the RTNL
 37  * (2) modifications and readers are protected against each other by
 38  *     the iflist_mtx.
 39  * (3) modifications are done in an RCU manner so atomic readers
 40  *     can traverse the list in RCU-safe blocks.
 41  *
 42  * As a consequence, reads (traversals) of the list can be protected
 43  * by either the RTNL, the iflist_mtx or RCU.
 44  */
 45 
 46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 47 {
 48         struct ieee80211_chanctx_conf *chanctx_conf;
 49         int power;
 50 
 51         rcu_read_lock();
 52         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 53         if (!chanctx_conf) {
 54                 rcu_read_unlock();
 55                 return false;
 56         }
 57 
 58         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 59         rcu_read_unlock();
 60 
 61         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 62                 power = min(power, sdata->user_power_level);
 63 
 64         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 65                 power = min(power, sdata->ap_power_level);
 66 
 67         if (power != sdata->vif.bss_conf.txpower) {
 68                 sdata->vif.bss_conf.txpower = power;
 69                 ieee80211_hw_config(sdata->local, 0);
 70                 return true;
 71         }
 72 
 73         return false;
 74 }
 75 
 76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 77                               bool update_bss)
 78 {
 79         if (__ieee80211_recalc_txpower(sdata) || update_bss)
 80                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 81 }
 82 
 83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 84 {
 85         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 86                 return 0;
 87 
 88         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 89         return IEEE80211_CONF_CHANGE_IDLE;
 90 }
 91 
 92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 93 {
 94         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 95                 return 0;
 96 
 97         ieee80211_flush_queues(local, NULL, false);
 98 
 99         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
100         return IEEE80211_CONF_CHANGE_IDLE;
101 }
102 
103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
104                                    bool force_active)
105 {
106         bool working, scanning, active;
107         unsigned int led_trig_start = 0, led_trig_stop = 0;
108 
109         lockdep_assert_held(&local->mtx);
110 
111         active = force_active ||
112                  !list_empty(&local->chanctx_list) ||
113                  local->monitors;
114 
115         working = !local->ops->remain_on_channel &&
116                   !list_empty(&local->roc_list);
117 
118         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
119                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
120 
121         if (working || scanning)
122                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123         else
124                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125 
126         if (active)
127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128         else
129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130 
131         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
132 
133         if (working || scanning || active)
134                 return __ieee80211_idle_off(local);
135         return __ieee80211_idle_on(local);
136 }
137 
138 u32 ieee80211_idle_off(struct ieee80211_local *local)
139 {
140         return __ieee80211_recalc_idle(local, true);
141 }
142 
143 void ieee80211_recalc_idle(struct ieee80211_local *local)
144 {
145         u32 change = __ieee80211_recalc_idle(local, false);
146         if (change)
147                 ieee80211_hw_config(local, change);
148 }
149 
150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
151 {
152         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
153                 return -EINVAL;
154 
155         dev->mtu = new_mtu;
156         return 0;
157 }
158 
159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
160                                 bool check_dup)
161 {
162         struct ieee80211_local *local = sdata->local;
163         struct ieee80211_sub_if_data *iter;
164         u64 new, mask, tmp;
165         u8 *m;
166         int ret = 0;
167 
168         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
169                 return 0;
170 
171         m = addr;
172         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175 
176         m = local->hw.wiphy->addr_mask;
177         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
178                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
179                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
180 
181         if (!check_dup)
182                 return ret;
183 
184         mutex_lock(&local->iflist_mtx);
185         list_for_each_entry(iter, &local->interfaces, list) {
186                 if (iter == sdata)
187                         continue;
188 
189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
190                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
191                         continue;
192 
193                 m = iter->vif.addr;
194                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
195                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
196                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
197 
198                 if ((new & ~mask) != (tmp & ~mask)) {
199                         ret = -EINVAL;
200                         break;
201                 }
202         }
203         mutex_unlock(&local->iflist_mtx);
204 
205         return ret;
206 }
207 
208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
209 {
210         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
211         struct sockaddr *sa = addr;
212         bool check_dup = true;
213         int ret;
214 
215         if (ieee80211_sdata_running(sdata))
216                 return -EBUSY;
217 
218         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
219             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
220                 check_dup = false;
221 
222         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
223         if (ret)
224                 return ret;
225 
226         ret = eth_mac_addr(dev, sa);
227 
228         if (ret == 0)
229                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
230 
231         return ret;
232 }
233 
234 static inline int identical_mac_addr_allowed(int type1, int type2)
235 {
236         return type1 == NL80211_IFTYPE_MONITOR ||
237                 type2 == NL80211_IFTYPE_MONITOR ||
238                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
239                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
241                 (type1 == NL80211_IFTYPE_WDS &&
242                         (type2 == NL80211_IFTYPE_WDS ||
243                          type2 == NL80211_IFTYPE_AP)) ||
244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
245                 (type1 == NL80211_IFTYPE_AP_VLAN &&
246                         (type2 == NL80211_IFTYPE_AP ||
247                          type2 == NL80211_IFTYPE_AP_VLAN));
248 }
249 
250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
251                                             enum nl80211_iftype iftype)
252 {
253         struct ieee80211_local *local = sdata->local;
254         struct ieee80211_sub_if_data *nsdata;
255         int ret;
256 
257         ASSERT_RTNL();
258 
259         /* we hold the RTNL here so can safely walk the list */
260         list_for_each_entry(nsdata, &local->interfaces, list) {
261                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
262                         /*
263                          * Only OCB and monitor mode may coexist
264                          */
265                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
266                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
267                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
268                              nsdata->vif.type == NL80211_IFTYPE_OCB))
269                                 return -EBUSY;
270 
271                         /*
272                          * Allow only a single IBSS interface to be up at any
273                          * time. This is restricted because beacon distribution
274                          * cannot work properly if both are in the same IBSS.
275                          *
276                          * To remove this restriction we'd have to disallow them
277                          * from setting the same SSID on different IBSS interfaces
278                          * belonging to the same hardware. Then, however, we're
279                          * faced with having to adopt two different TSF timers...
280                          */
281                         if (iftype == NL80211_IFTYPE_ADHOC &&
282                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
283                                 return -EBUSY;
284                         /*
285                          * will not add another interface while any channel
286                          * switch is active.
287                          */
288                         if (nsdata->vif.csa_active)
289                                 return -EBUSY;
290 
291                         /*
292                          * The remaining checks are only performed for interfaces
293                          * with the same MAC address.
294                          */
295                         if (!ether_addr_equal(sdata->vif.addr,
296                                               nsdata->vif.addr))
297                                 continue;
298 
299                         /*
300                          * check whether it may have the same address
301                          */
302                         if (!identical_mac_addr_allowed(iftype,
303                                                         nsdata->vif.type))
304                                 return -ENOTUNIQ;
305 
306                         /*
307                          * can only add VLANs to enabled APs
308                          */
309                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
310                             nsdata->vif.type == NL80211_IFTYPE_AP)
311                                 sdata->bss = &nsdata->u.ap;
312                 }
313         }
314 
315         mutex_lock(&local->chanctx_mtx);
316         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
317         mutex_unlock(&local->chanctx_mtx);
318         return ret;
319 }
320 
321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
322                                   enum nl80211_iftype iftype)
323 {
324         int n_queues = sdata->local->hw.queues;
325         int i;
326 
327         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
328                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
330                                          IEEE80211_INVAL_HW_QUEUE))
331                                 return -EINVAL;
332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
333                                          n_queues))
334                                 return -EINVAL;
335                 }
336         }
337 
338         if ((iftype != NL80211_IFTYPE_AP &&
339              iftype != NL80211_IFTYPE_P2P_GO &&
340              iftype != NL80211_IFTYPE_MESH_POINT) ||
341             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
342                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
343                 return 0;
344         }
345 
346         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
347                 return -EINVAL;
348 
349         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
350                 return -EINVAL;
351 
352         return 0;
353 }
354 
355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
356                                     const int offset)
357 {
358         struct ieee80211_local *local = sdata->local;
359         u32 flags = sdata->u.mntr_flags;
360 
361 #define ADJUST(_f, _s)  do {                                    \
362         if (flags & MONITOR_FLAG_##_f)                          \
363                 local->fif_##_s += offset;                      \
364         } while (0)
365 
366         ADJUST(FCSFAIL, fcsfail);
367         ADJUST(PLCPFAIL, plcpfail);
368         ADJUST(CONTROL, control);
369         ADJUST(CONTROL, pspoll);
370         ADJUST(OTHER_BSS, other_bss);
371 
372 #undef ADJUST
373 }
374 
375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
376 {
377         struct ieee80211_local *local = sdata->local;
378         int i;
379 
380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
381                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
382                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
383                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
384                         sdata->vif.hw_queue[i] = i;
385                 else
386                         sdata->vif.hw_queue[i] = 0;
387         }
388         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
389 }
390 
391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
392 {
393         struct ieee80211_sub_if_data *sdata;
394         int ret;
395 
396         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
397                 return 0;
398 
399         ASSERT_RTNL();
400 
401         if (local->monitor_sdata)
402                 return 0;
403 
404         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
405         if (!sdata)
406                 return -ENOMEM;
407 
408         /* set up data */
409         sdata->local = local;
410         sdata->vif.type = NL80211_IFTYPE_MONITOR;
411         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
412                  wiphy_name(local->hw.wiphy));
413         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
414 
415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
416 
417         ieee80211_set_default_queues(sdata);
418 
419         ret = drv_add_interface(local, sdata);
420         if (WARN_ON(ret)) {
421                 /* ok .. stupid driver, it asked for this! */
422                 kfree(sdata);
423                 return ret;
424         }
425 
426         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
427         if (ret) {
428                 kfree(sdata);
429                 return ret;
430         }
431 
432         mutex_lock(&local->iflist_mtx);
433         rcu_assign_pointer(local->monitor_sdata, sdata);
434         mutex_unlock(&local->iflist_mtx);
435 
436         mutex_lock(&local->mtx);
437         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
438                                         IEEE80211_CHANCTX_EXCLUSIVE);
439         mutex_unlock(&local->mtx);
440         if (ret) {
441                 mutex_lock(&local->iflist_mtx);
442                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
443                 mutex_unlock(&local->iflist_mtx);
444                 synchronize_net();
445                 drv_remove_interface(local, sdata);
446                 kfree(sdata);
447                 return ret;
448         }
449 
450         return 0;
451 }
452 
453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
454 {
455         struct ieee80211_sub_if_data *sdata;
456 
457         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
458                 return;
459 
460         ASSERT_RTNL();
461 
462         mutex_lock(&local->iflist_mtx);
463 
464         sdata = rcu_dereference_protected(local->monitor_sdata,
465                                           lockdep_is_held(&local->iflist_mtx));
466         if (!sdata) {
467                 mutex_unlock(&local->iflist_mtx);
468                 return;
469         }
470 
471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
472         mutex_unlock(&local->iflist_mtx);
473 
474         synchronize_net();
475 
476         mutex_lock(&local->mtx);
477         ieee80211_vif_release_channel(sdata);
478         mutex_unlock(&local->mtx);
479 
480         drv_remove_interface(local, sdata);
481 
482         kfree(sdata);
483 }
484 
485 /*
486  * NOTE: Be very careful when changing this function, it must NOT return
487  * an error on interface type changes that have been pre-checked, so most
488  * checks should be in ieee80211_check_concurrent_iface.
489  */
490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
491 {
492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
493         struct net_device *dev = wdev->netdev;
494         struct ieee80211_local *local = sdata->local;
495         struct sta_info *sta;
496         u32 changed = 0;
497         int res;
498         u32 hw_reconf_flags = 0;
499 
500         switch (sdata->vif.type) {
501         case NL80211_IFTYPE_WDS:
502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
503                         return -ENOLINK;
504                 break;
505         case NL80211_IFTYPE_AP_VLAN: {
506                 struct ieee80211_sub_if_data *master;
507 
508                 if (!sdata->bss)
509                         return -ENOLINK;
510 
511                 mutex_lock(&local->mtx);
512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
513                 mutex_unlock(&local->mtx);
514 
515                 master = container_of(sdata->bss,
516                                       struct ieee80211_sub_if_data, u.ap);
517                 sdata->control_port_protocol =
518                         master->control_port_protocol;
519                 sdata->control_port_no_encrypt =
520                         master->control_port_no_encrypt;
521                 sdata->vif.cab_queue = master->vif.cab_queue;
522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
523                        sizeof(sdata->vif.hw_queue));
524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
525 
526                 mutex_lock(&local->key_mtx);
527                 sdata->crypto_tx_tailroom_needed_cnt +=
528                         master->crypto_tx_tailroom_needed_cnt;
529                 mutex_unlock(&local->key_mtx);
530 
531                 break;
532                 }
533         case NL80211_IFTYPE_AP:
534                 sdata->bss = &sdata->u.ap;
535                 break;
536         case NL80211_IFTYPE_MESH_POINT:
537         case NL80211_IFTYPE_STATION:
538         case NL80211_IFTYPE_MONITOR:
539         case NL80211_IFTYPE_ADHOC:
540         case NL80211_IFTYPE_P2P_DEVICE:
541         case NL80211_IFTYPE_OCB:
542                 /* no special treatment */
543                 break;
544         case NL80211_IFTYPE_UNSPECIFIED:
545         case NUM_NL80211_IFTYPES:
546         case NL80211_IFTYPE_P2P_CLIENT:
547         case NL80211_IFTYPE_P2P_GO:
548                 /* cannot happen */
549                 WARN_ON(1);
550                 break;
551         }
552 
553         if (local->open_count == 0) {
554                 res = drv_start(local);
555                 if (res)
556                         goto err_del_bss;
557                 /* we're brought up, everything changes */
558                 hw_reconf_flags = ~0;
559                 ieee80211_led_radio(local, true);
560                 ieee80211_mod_tpt_led_trig(local,
561                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
562         }
563 
564         /*
565          * Copy the hopefully now-present MAC address to
566          * this interface, if it has the special null one.
567          */
568         if (dev && is_zero_ether_addr(dev->dev_addr)) {
569                 memcpy(dev->dev_addr,
570                        local->hw.wiphy->perm_addr,
571                        ETH_ALEN);
572                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
573 
574                 if (!is_valid_ether_addr(dev->dev_addr)) {
575                         res = -EADDRNOTAVAIL;
576                         goto err_stop;
577                 }
578         }
579 
580         switch (sdata->vif.type) {
581         case NL80211_IFTYPE_AP_VLAN:
582                 /* no need to tell driver, but set carrier and chanctx */
583                 if (rtnl_dereference(sdata->bss->beacon)) {
584                         ieee80211_vif_vlan_copy_chanctx(sdata);
585                         netif_carrier_on(dev);
586                 } else {
587                         netif_carrier_off(dev);
588                 }
589                 break;
590         case NL80211_IFTYPE_MONITOR:
591                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
592                         local->cooked_mntrs++;
593                         break;
594                 }
595 
596                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
597                         res = drv_add_interface(local, sdata);
598                         if (res)
599                                 goto err_stop;
600                 } else if (local->monitors == 0 && local->open_count == 0) {
601                         res = ieee80211_add_virtual_monitor(local);
602                         if (res)
603                                 goto err_stop;
604                 }
605 
606                 /* must be before the call to ieee80211_configure_filter */
607                 local->monitors++;
608                 if (local->monitors == 1) {
609                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
610                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
611                 }
612 
613                 ieee80211_adjust_monitor_flags(sdata, 1);
614                 ieee80211_configure_filter(local);
615                 mutex_lock(&local->mtx);
616                 ieee80211_recalc_idle(local);
617                 mutex_unlock(&local->mtx);
618 
619                 netif_carrier_on(dev);
620                 break;
621         default:
622                 if (coming_up) {
623                         ieee80211_del_virtual_monitor(local);
624 
625                         res = drv_add_interface(local, sdata);
626                         if (res)
627                                 goto err_stop;
628                         res = ieee80211_check_queues(sdata,
629                                 ieee80211_vif_type_p2p(&sdata->vif));
630                         if (res)
631                                 goto err_del_interface;
632                 }
633 
634                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
635                         local->fif_pspoll++;
636                         local->fif_probe_req++;
637 
638                         ieee80211_configure_filter(local);
639                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
640                         local->fif_probe_req++;
641                 }
642 
643                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
644                         changed |= ieee80211_reset_erp_info(sdata);
645                 ieee80211_bss_info_change_notify(sdata, changed);
646 
647                 switch (sdata->vif.type) {
648                 case NL80211_IFTYPE_STATION:
649                 case NL80211_IFTYPE_ADHOC:
650                 case NL80211_IFTYPE_AP:
651                 case NL80211_IFTYPE_MESH_POINT:
652                 case NL80211_IFTYPE_OCB:
653                         netif_carrier_off(dev);
654                         break;
655                 case NL80211_IFTYPE_WDS:
656                 case NL80211_IFTYPE_P2P_DEVICE:
657                         break;
658                 default:
659                         /* not reached */
660                         WARN_ON(1);
661                 }
662 
663                 /*
664                  * set default queue parameters so drivers don't
665                  * need to initialise the hardware if the hardware
666                  * doesn't start up with sane defaults
667                  */
668                 ieee80211_set_wmm_default(sdata, true);
669         }
670 
671         set_bit(SDATA_STATE_RUNNING, &sdata->state);
672 
673         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
674                 /* Create STA entry for the WDS peer */
675                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
676                                      GFP_KERNEL);
677                 if (!sta) {
678                         res = -ENOMEM;
679                         goto err_del_interface;
680                 }
681 
682                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
683                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
684                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
685 
686                 res = sta_info_insert(sta);
687                 if (res) {
688                         /* STA has been freed */
689                         goto err_del_interface;
690                 }
691 
692                 rate_control_rate_init(sta);
693                 netif_carrier_on(dev);
694         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
695                 rcu_assign_pointer(local->p2p_sdata, sdata);
696         }
697 
698         /*
699          * set_multicast_list will be invoked by the networking core
700          * which will check whether any increments here were done in
701          * error and sync them down to the hardware as filter flags.
702          */
703         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
704                 atomic_inc(&local->iff_allmultis);
705 
706         if (coming_up)
707                 local->open_count++;
708 
709         if (hw_reconf_flags)
710                 ieee80211_hw_config(local, hw_reconf_flags);
711 
712         ieee80211_recalc_ps(local, -1);
713 
714         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
715             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
716                 /* XXX: for AP_VLAN, actually track AP queues */
717                 netif_tx_start_all_queues(dev);
718         } else if (dev) {
719                 unsigned long flags;
720                 int n_acs = IEEE80211_NUM_ACS;
721                 int ac;
722 
723                 if (local->hw.queues < IEEE80211_NUM_ACS)
724                         n_acs = 1;
725 
726                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
727                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
728                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
729                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
730                         for (ac = 0; ac < n_acs; ac++) {
731                                 int ac_queue = sdata->vif.hw_queue[ac];
732 
733                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
734                                     skb_queue_empty(&local->pending[ac_queue]))
735                                         netif_start_subqueue(dev, ac);
736                         }
737                 }
738                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
739         }
740 
741         return 0;
742  err_del_interface:
743         drv_remove_interface(local, sdata);
744  err_stop:
745         if (!local->open_count)
746                 drv_stop(local);
747  err_del_bss:
748         sdata->bss = NULL;
749         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
750                 mutex_lock(&local->mtx);
751                 list_del(&sdata->u.vlan.list);
752                 mutex_unlock(&local->mtx);
753         }
754         /* might already be clear but that doesn't matter */
755         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
756         return res;
757 }
758 
759 static int ieee80211_open(struct net_device *dev)
760 {
761         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
762         int err;
763 
764         /* fail early if user set an invalid address */
765         if (!is_valid_ether_addr(dev->dev_addr))
766                 return -EADDRNOTAVAIL;
767 
768         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
769         if (err)
770                 return err;
771 
772         return ieee80211_do_open(&sdata->wdev, true);
773 }
774 
775 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
776                               bool going_down)
777 {
778         struct ieee80211_local *local = sdata->local;
779         unsigned long flags;
780         struct sk_buff *skb, *tmp;
781         u32 hw_reconf_flags = 0;
782         int i, flushed;
783         struct ps_data *ps;
784         struct cfg80211_chan_def chandef;
785         bool cancel_scan;
786 
787         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
788 
789         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
790         if (cancel_scan)
791                 ieee80211_scan_cancel(local);
792 
793         /*
794          * Stop TX on this interface first.
795          */
796         if (sdata->dev)
797                 netif_tx_stop_all_queues(sdata->dev);
798 
799         ieee80211_roc_purge(local, sdata);
800 
801         switch (sdata->vif.type) {
802         case NL80211_IFTYPE_STATION:
803                 ieee80211_mgd_stop(sdata);
804                 break;
805         case NL80211_IFTYPE_ADHOC:
806                 ieee80211_ibss_stop(sdata);
807                 break;
808         case NL80211_IFTYPE_AP:
809                 cancel_work_sync(&sdata->u.ap.request_smps_work);
810                 break;
811         default:
812                 break;
813         }
814 
815         /*
816          * Remove all stations associated with this interface.
817          *
818          * This must be done before calling ops->remove_interface()
819          * because otherwise we can later invoke ops->sta_notify()
820          * whenever the STAs are removed, and that invalidates driver
821          * assumptions about always getting a vif pointer that is valid
822          * (because if we remove a STA after ops->remove_interface()
823          * the driver will have removed the vif info already!)
824          *
825          * In WDS mode a station must exist here and be flushed, for
826          * AP_VLANs stations may exist since there's nothing else that
827          * would have removed them, but in other modes there shouldn't
828          * be any stations.
829          */
830         flushed = sta_info_flush(sdata);
831         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
832                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
833                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
834 
835         /* don't count this interface for allmulti while it is down */
836         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
837                 atomic_dec(&local->iff_allmultis);
838 
839         if (sdata->vif.type == NL80211_IFTYPE_AP) {
840                 local->fif_pspoll--;
841                 local->fif_probe_req--;
842         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
843                 local->fif_probe_req--;
844         }
845 
846         if (sdata->dev) {
847                 netif_addr_lock_bh(sdata->dev);
848                 spin_lock_bh(&local->filter_lock);
849                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
850                                  sdata->dev->addr_len);
851                 spin_unlock_bh(&local->filter_lock);
852                 netif_addr_unlock_bh(sdata->dev);
853         }
854 
855         del_timer_sync(&local->dynamic_ps_timer);
856         cancel_work_sync(&local->dynamic_ps_enable_work);
857 
858         cancel_work_sync(&sdata->recalc_smps);
859         sdata_lock(sdata);
860         mutex_lock(&local->mtx);
861         sdata->vif.csa_active = false;
862         if (sdata->vif.type == NL80211_IFTYPE_STATION)
863                 sdata->u.mgd.csa_waiting_bcn = false;
864         if (sdata->csa_block_tx) {
865                 ieee80211_wake_vif_queues(local, sdata,
866                                           IEEE80211_QUEUE_STOP_REASON_CSA);
867                 sdata->csa_block_tx = false;
868         }
869         mutex_unlock(&local->mtx);
870         sdata_unlock(sdata);
871 
872         cancel_work_sync(&sdata->csa_finalize_work);
873 
874         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
875 
876         if (sdata->wdev.cac_started) {
877                 chandef = sdata->vif.bss_conf.chandef;
878                 WARN_ON(local->suspended);
879                 mutex_lock(&local->mtx);
880                 ieee80211_vif_release_channel(sdata);
881                 mutex_unlock(&local->mtx);
882                 cfg80211_cac_event(sdata->dev, &chandef,
883                                    NL80211_RADAR_CAC_ABORTED,
884                                    GFP_KERNEL);
885         }
886 
887         /* APs need special treatment */
888         if (sdata->vif.type == NL80211_IFTYPE_AP) {
889                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
890 
891                 /* down all dependent devices, that is VLANs */
892                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
893                                          u.vlan.list)
894                         dev_close(vlan->dev);
895                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
896         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
897                 /* remove all packets in parent bc_buf pointing to this dev */
898                 ps = &sdata->bss->ps;
899 
900                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
901                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
902                         if (skb->dev == sdata->dev) {
903                                 __skb_unlink(skb, &ps->bc_buf);
904                                 local->total_ps_buffered--;
905                                 ieee80211_free_txskb(&local->hw, skb);
906                         }
907                 }
908                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
909         }
910 
911         if (going_down)
912                 local->open_count--;
913 
914         switch (sdata->vif.type) {
915         case NL80211_IFTYPE_AP_VLAN:
916                 mutex_lock(&local->mtx);
917                 list_del(&sdata->u.vlan.list);
918                 mutex_unlock(&local->mtx);
919                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
920                 /* see comment in the default case below */
921                 ieee80211_free_keys(sdata, true);
922                 /* no need to tell driver */
923                 break;
924         case NL80211_IFTYPE_MONITOR:
925                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
926                         local->cooked_mntrs--;
927                         break;
928                 }
929 
930                 local->monitors--;
931                 if (local->monitors == 0) {
932                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
933                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
934                 }
935 
936                 ieee80211_adjust_monitor_flags(sdata, -1);
937                 break;
938         case NL80211_IFTYPE_P2P_DEVICE:
939                 /* relies on synchronize_rcu() below */
940                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
941                 /* fall through */
942         default:
943                 cancel_work_sync(&sdata->work);
944                 /*
945                  * When we get here, the interface is marked down.
946                  * Free the remaining keys, if there are any
947                  * (which can happen in AP mode if userspace sets
948                  * keys before the interface is operating, and maybe
949                  * also in WDS mode)
950                  *
951                  * Force the key freeing to always synchronize_net()
952                  * to wait for the RX path in case it is using this
953                  * interface enqueuing frames at this very time on
954                  * another CPU.
955                  */
956                 ieee80211_free_keys(sdata, true);
957                 skb_queue_purge(&sdata->skb_queue);
958         }
959 
960         sdata->bss = NULL;
961 
962         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
963         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
964                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
965                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
966                         if (info->control.vif == &sdata->vif) {
967                                 __skb_unlink(skb, &local->pending[i]);
968                                 ieee80211_free_txskb(&local->hw, skb);
969                         }
970                 }
971         }
972         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
973 
974         if (sdata->vif.txq) {
975                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
976 
977                 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
978                 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
979         }
980 
981         if (local->open_count == 0)
982                 ieee80211_clear_tx_pending(local);
983 
984         /*
985          * If the interface goes down while suspended, presumably because
986          * the device was unplugged and that happens before our resume,
987          * then the driver is already unconfigured and the remainder of
988          * this function isn't needed.
989          * XXX: what about WoWLAN? If the device has software state, e.g.
990          *      memory allocated, it might expect teardown commands from
991          *      mac80211 here?
992          */
993         if (local->suspended) {
994                 WARN_ON(local->wowlan);
995                 WARN_ON(rtnl_dereference(local->monitor_sdata));
996                 return;
997         }
998 
999         switch (sdata->vif.type) {
1000         case NL80211_IFTYPE_AP_VLAN:
1001                 break;
1002         case NL80211_IFTYPE_MONITOR:
1003                 if (local->monitors == 0)
1004                         ieee80211_del_virtual_monitor(local);
1005 
1006                 mutex_lock(&local->mtx);
1007                 ieee80211_recalc_idle(local);
1008                 mutex_unlock(&local->mtx);
1009 
1010                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1011                         break;
1012 
1013                 /* fall through */
1014         default:
1015                 if (going_down)
1016                         drv_remove_interface(local, sdata);
1017         }
1018 
1019         ieee80211_recalc_ps(local, -1);
1020 
1021         if (cancel_scan)
1022                 flush_delayed_work(&local->scan_work);
1023 
1024         if (local->open_count == 0) {
1025                 ieee80211_stop_device(local);
1026 
1027                 /* no reconfiguring after stop! */
1028                 return;
1029         }
1030 
1031         /* do after stop to avoid reconfiguring when we stop anyway */
1032         ieee80211_configure_filter(local);
1033         ieee80211_hw_config(local, hw_reconf_flags);
1034 
1035         if (local->monitors == local->open_count)
1036                 ieee80211_add_virtual_monitor(local);
1037 }
1038 
1039 static int ieee80211_stop(struct net_device *dev)
1040 {
1041         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1042 
1043         ieee80211_do_stop(sdata, true);
1044 
1045         return 0;
1046 }
1047 
1048 static void ieee80211_set_multicast_list(struct net_device *dev)
1049 {
1050         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1051         struct ieee80211_local *local = sdata->local;
1052         int allmulti, sdata_allmulti;
1053 
1054         allmulti = !!(dev->flags & IFF_ALLMULTI);
1055         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1056 
1057         if (allmulti != sdata_allmulti) {
1058                 if (dev->flags & IFF_ALLMULTI)
1059                         atomic_inc(&local->iff_allmultis);
1060                 else
1061                         atomic_dec(&local->iff_allmultis);
1062                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1063         }
1064 
1065         spin_lock_bh(&local->filter_lock);
1066         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1067         spin_unlock_bh(&local->filter_lock);
1068         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1069 }
1070 
1071 /*
1072  * Called when the netdev is removed or, by the code below, before
1073  * the interface type changes.
1074  */
1075 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1076 {
1077         int i;
1078 
1079         /* free extra data */
1080         ieee80211_free_keys(sdata, false);
1081 
1082         ieee80211_debugfs_remove_netdev(sdata);
1083 
1084         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1085                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1086         sdata->fragment_next = 0;
1087 
1088         if (ieee80211_vif_is_mesh(&sdata->vif))
1089                 mesh_rmc_free(sdata);
1090 }
1091 
1092 static void ieee80211_uninit(struct net_device *dev)
1093 {
1094         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1095 }
1096 
1097 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1098                                          struct sk_buff *skb,
1099                                          void *accel_priv,
1100                                          select_queue_fallback_t fallback)
1101 {
1102         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1103 }
1104 
1105 static struct rtnl_link_stats64 *
1106 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1107 {
1108         int i;
1109 
1110         for_each_possible_cpu(i) {
1111                 const struct pcpu_sw_netstats *tstats;
1112                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1113                 unsigned int start;
1114 
1115                 tstats = per_cpu_ptr(dev->tstats, i);
1116 
1117                 do {
1118                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1119                         rx_packets = tstats->rx_packets;
1120                         tx_packets = tstats->tx_packets;
1121                         rx_bytes = tstats->rx_bytes;
1122                         tx_bytes = tstats->tx_bytes;
1123                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1124 
1125                 stats->rx_packets += rx_packets;
1126                 stats->tx_packets += tx_packets;
1127                 stats->rx_bytes   += rx_bytes;
1128                 stats->tx_bytes   += tx_bytes;
1129         }
1130 
1131         return stats;
1132 }
1133 
1134 static const struct net_device_ops ieee80211_dataif_ops = {
1135         .ndo_open               = ieee80211_open,
1136         .ndo_stop               = ieee80211_stop,
1137         .ndo_uninit             = ieee80211_uninit,
1138         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1139         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1140         .ndo_change_mtu         = ieee80211_change_mtu,
1141         .ndo_set_mac_address    = ieee80211_change_mac,
1142         .ndo_select_queue       = ieee80211_netdev_select_queue,
1143         .ndo_get_stats64        = ieee80211_get_stats64,
1144 };
1145 
1146 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1147                                           struct sk_buff *skb,
1148                                           void *accel_priv,
1149                                           select_queue_fallback_t fallback)
1150 {
1151         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1152         struct ieee80211_local *local = sdata->local;
1153         struct ieee80211_hdr *hdr;
1154         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1155 
1156         if (local->hw.queues < IEEE80211_NUM_ACS)
1157                 return 0;
1158 
1159         if (skb->len < 4 ||
1160             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1161                 return 0; /* doesn't matter, frame will be dropped */
1162 
1163         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1164 
1165         return ieee80211_select_queue_80211(sdata, skb, hdr);
1166 }
1167 
1168 static const struct net_device_ops ieee80211_monitorif_ops = {
1169         .ndo_open               = ieee80211_open,
1170         .ndo_stop               = ieee80211_stop,
1171         .ndo_uninit             = ieee80211_uninit,
1172         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1173         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1174         .ndo_change_mtu         = ieee80211_change_mtu,
1175         .ndo_set_mac_address    = ieee80211_change_mac,
1176         .ndo_select_queue       = ieee80211_monitor_select_queue,
1177         .ndo_get_stats64        = ieee80211_get_stats64,
1178 };
1179 
1180 static void ieee80211_if_free(struct net_device *dev)
1181 {
1182         free_percpu(dev->tstats);
1183         free_netdev(dev);
1184 }
1185 
1186 static void ieee80211_if_setup(struct net_device *dev)
1187 {
1188         ether_setup(dev);
1189         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1190         dev->netdev_ops = &ieee80211_dataif_ops;
1191         dev->destructor = ieee80211_if_free;
1192 }
1193 
1194 static void ieee80211_iface_work(struct work_struct *work)
1195 {
1196         struct ieee80211_sub_if_data *sdata =
1197                 container_of(work, struct ieee80211_sub_if_data, work);
1198         struct ieee80211_local *local = sdata->local;
1199         struct sk_buff *skb;
1200         struct sta_info *sta;
1201         struct ieee80211_ra_tid *ra_tid;
1202         struct ieee80211_rx_agg *rx_agg;
1203 
1204         if (!ieee80211_sdata_running(sdata))
1205                 return;
1206 
1207         if (local->scanning)
1208                 return;
1209 
1210         if (!ieee80211_can_run_worker(local))
1211                 return;
1212 
1213         /* first process frames */
1214         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1215                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1216 
1217                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1218                         ra_tid = (void *)&skb->cb;
1219                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1220                                                  ra_tid->tid);
1221                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1222                         ra_tid = (void *)&skb->cb;
1223                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1224                                                 ra_tid->tid);
1225                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1226                         rx_agg = (void *)&skb->cb;
1227                         mutex_lock(&local->sta_mtx);
1228                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1229                         if (sta)
1230                                 __ieee80211_start_rx_ba_session(sta,
1231                                                 0, 0, 0, 1, rx_agg->tid,
1232                                                 IEEE80211_MAX_AMPDU_BUF,
1233                                                 false, true);
1234                         mutex_unlock(&local->sta_mtx);
1235                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1236                         rx_agg = (void *)&skb->cb;
1237                         mutex_lock(&local->sta_mtx);
1238                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1239                         if (sta)
1240                                 __ieee80211_stop_rx_ba_session(sta,
1241                                                         rx_agg->tid,
1242                                                         WLAN_BACK_RECIPIENT, 0,
1243                                                         false);
1244                         mutex_unlock(&local->sta_mtx);
1245                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1246                         ieee80211_process_tdls_channel_switch(sdata, skb);
1247                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1248                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1249                         int len = skb->len;
1250 
1251                         mutex_lock(&local->sta_mtx);
1252                         sta = sta_info_get_bss(sdata, mgmt->sa);
1253                         if (sta) {
1254                                 switch (mgmt->u.action.u.addba_req.action_code) {
1255                                 case WLAN_ACTION_ADDBA_REQ:
1256                                         ieee80211_process_addba_request(
1257                                                         local, sta, mgmt, len);
1258                                         break;
1259                                 case WLAN_ACTION_ADDBA_RESP:
1260                                         ieee80211_process_addba_resp(local, sta,
1261                                                                      mgmt, len);
1262                                         break;
1263                                 case WLAN_ACTION_DELBA:
1264                                         ieee80211_process_delba(sdata, sta,
1265                                                                 mgmt, len);
1266                                         break;
1267                                 default:
1268                                         WARN_ON(1);
1269                                         break;
1270                                 }
1271                         }
1272                         mutex_unlock(&local->sta_mtx);
1273                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1274                         struct ieee80211_hdr *hdr = (void *)mgmt;
1275                         /*
1276                          * So the frame isn't mgmt, but frame_control
1277                          * is at the right place anyway, of course, so
1278                          * the if statement is correct.
1279                          *
1280                          * Warn if we have other data frame types here,
1281                          * they must not get here.
1282                          */
1283                         WARN_ON(hdr->frame_control &
1284                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1285                         WARN_ON(!(hdr->seq_ctrl &
1286                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1287                         /*
1288                          * This was a fragment of a frame, received while
1289                          * a block-ack session was active. That cannot be
1290                          * right, so terminate the session.
1291                          */
1292                         mutex_lock(&local->sta_mtx);
1293                         sta = sta_info_get_bss(sdata, mgmt->sa);
1294                         if (sta) {
1295                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1296                                                 IEEE80211_QOS_CTL_TID_MASK;
1297 
1298                                 __ieee80211_stop_rx_ba_session(
1299                                         sta, tid, WLAN_BACK_RECIPIENT,
1300                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1301                                         true);
1302                         }
1303                         mutex_unlock(&local->sta_mtx);
1304                 } else switch (sdata->vif.type) {
1305                 case NL80211_IFTYPE_STATION:
1306                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1307                         break;
1308                 case NL80211_IFTYPE_ADHOC:
1309                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1310                         break;
1311                 case NL80211_IFTYPE_MESH_POINT:
1312                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1313                                 break;
1314                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1315                         break;
1316                 default:
1317                         WARN(1, "frame for unexpected interface type");
1318                         break;
1319                 }
1320 
1321                 kfree_skb(skb);
1322         }
1323 
1324         /* then other type-dependent work */
1325         switch (sdata->vif.type) {
1326         case NL80211_IFTYPE_STATION:
1327                 ieee80211_sta_work(sdata);
1328                 break;
1329         case NL80211_IFTYPE_ADHOC:
1330                 ieee80211_ibss_work(sdata);
1331                 break;
1332         case NL80211_IFTYPE_MESH_POINT:
1333                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1334                         break;
1335                 ieee80211_mesh_work(sdata);
1336                 break;
1337         case NL80211_IFTYPE_OCB:
1338                 ieee80211_ocb_work(sdata);
1339                 break;
1340         default:
1341                 break;
1342         }
1343 }
1344 
1345 static void ieee80211_recalc_smps_work(struct work_struct *work)
1346 {
1347         struct ieee80211_sub_if_data *sdata =
1348                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1349 
1350         ieee80211_recalc_smps(sdata);
1351 }
1352 
1353 /*
1354  * Helper function to initialise an interface to a specific type.
1355  */
1356 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1357                                   enum nl80211_iftype type)
1358 {
1359         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1360                                                     0xff, 0xff, 0xff};
1361 
1362         /* clear type-dependent union */
1363         memset(&sdata->u, 0, sizeof(sdata->u));
1364 
1365         /* and set some type-dependent values */
1366         sdata->vif.type = type;
1367         sdata->vif.p2p = false;
1368         sdata->wdev.iftype = type;
1369 
1370         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1371         sdata->control_port_no_encrypt = false;
1372         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1373         sdata->vif.bss_conf.idle = true;
1374 
1375         sdata->noack_map = 0;
1376 
1377         /* only monitor/p2p-device differ */
1378         if (sdata->dev) {
1379                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1380                 sdata->dev->type = ARPHRD_ETHER;
1381         }
1382 
1383         skb_queue_head_init(&sdata->skb_queue);
1384         INIT_WORK(&sdata->work, ieee80211_iface_work);
1385         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1386         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1387         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1388         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1389 
1390         switch (type) {
1391         case NL80211_IFTYPE_P2P_GO:
1392                 type = NL80211_IFTYPE_AP;
1393                 sdata->vif.type = type;
1394                 sdata->vif.p2p = true;
1395                 /* fall through */
1396         case NL80211_IFTYPE_AP:
1397                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1398                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1399                 INIT_WORK(&sdata->u.ap.request_smps_work,
1400                           ieee80211_request_smps_ap_work);
1401                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1402                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1403                 break;
1404         case NL80211_IFTYPE_P2P_CLIENT:
1405                 type = NL80211_IFTYPE_STATION;
1406                 sdata->vif.type = type;
1407                 sdata->vif.p2p = true;
1408                 /* fall through */
1409         case NL80211_IFTYPE_STATION:
1410                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1411                 ieee80211_sta_setup_sdata(sdata);
1412                 break;
1413         case NL80211_IFTYPE_OCB:
1414                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1415                 ieee80211_ocb_setup_sdata(sdata);
1416                 break;
1417         case NL80211_IFTYPE_ADHOC:
1418                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1419                 ieee80211_ibss_setup_sdata(sdata);
1420                 break;
1421         case NL80211_IFTYPE_MESH_POINT:
1422                 if (ieee80211_vif_is_mesh(&sdata->vif))
1423                         ieee80211_mesh_init_sdata(sdata);
1424                 break;
1425         case NL80211_IFTYPE_MONITOR:
1426                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1427                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1428                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1429                                       MONITOR_FLAG_OTHER_BSS;
1430                 break;
1431         case NL80211_IFTYPE_WDS:
1432                 sdata->vif.bss_conf.bssid = NULL;
1433                 break;
1434         case NL80211_IFTYPE_AP_VLAN:
1435         case NL80211_IFTYPE_P2P_DEVICE:
1436                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1437                 break;
1438         case NL80211_IFTYPE_UNSPECIFIED:
1439         case NUM_NL80211_IFTYPES:
1440                 BUG();
1441                 break;
1442         }
1443 
1444         ieee80211_debugfs_add_netdev(sdata);
1445 }
1446 
1447 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1448                                            enum nl80211_iftype type)
1449 {
1450         struct ieee80211_local *local = sdata->local;
1451         int ret, err;
1452         enum nl80211_iftype internal_type = type;
1453         bool p2p = false;
1454 
1455         ASSERT_RTNL();
1456 
1457         if (!local->ops->change_interface)
1458                 return -EBUSY;
1459 
1460         switch (sdata->vif.type) {
1461         case NL80211_IFTYPE_AP:
1462         case NL80211_IFTYPE_STATION:
1463         case NL80211_IFTYPE_ADHOC:
1464         case NL80211_IFTYPE_OCB:
1465                 /*
1466                  * Could maybe also all others here?
1467                  * Just not sure how that interacts
1468                  * with the RX/config path e.g. for
1469                  * mesh.
1470                  */
1471                 break;
1472         default:
1473                 return -EBUSY;
1474         }
1475 
1476         switch (type) {
1477         case NL80211_IFTYPE_AP:
1478         case NL80211_IFTYPE_STATION:
1479         case NL80211_IFTYPE_ADHOC:
1480         case NL80211_IFTYPE_OCB:
1481                 /*
1482                  * Could probably support everything
1483                  * but WDS here (WDS do_open can fail
1484                  * under memory pressure, which this
1485                  * code isn't prepared to handle).
1486                  */
1487                 break;
1488         case NL80211_IFTYPE_P2P_CLIENT:
1489                 p2p = true;
1490                 internal_type = NL80211_IFTYPE_STATION;
1491                 break;
1492         case NL80211_IFTYPE_P2P_GO:
1493                 p2p = true;
1494                 internal_type = NL80211_IFTYPE_AP;
1495                 break;
1496         default:
1497                 return -EBUSY;
1498         }
1499 
1500         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1501         if (ret)
1502                 return ret;
1503 
1504         ieee80211_do_stop(sdata, false);
1505 
1506         ieee80211_teardown_sdata(sdata);
1507 
1508         ret = drv_change_interface(local, sdata, internal_type, p2p);
1509         if (ret)
1510                 type = ieee80211_vif_type_p2p(&sdata->vif);
1511 
1512         /*
1513          * Ignore return value here, there's not much we can do since
1514          * the driver changed the interface type internally already.
1515          * The warnings will hopefully make driver authors fix it :-)
1516          */
1517         ieee80211_check_queues(sdata, type);
1518 
1519         ieee80211_setup_sdata(sdata, type);
1520 
1521         err = ieee80211_do_open(&sdata->wdev, false);
1522         WARN(err, "type change: do_open returned %d", err);
1523 
1524         return ret;
1525 }
1526 
1527 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1528                              enum nl80211_iftype type)
1529 {
1530         int ret;
1531 
1532         ASSERT_RTNL();
1533 
1534         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1535                 return 0;
1536 
1537         if (ieee80211_sdata_running(sdata)) {
1538                 ret = ieee80211_runtime_change_iftype(sdata, type);
1539                 if (ret)
1540                         return ret;
1541         } else {
1542                 /* Purge and reset type-dependent state. */
1543                 ieee80211_teardown_sdata(sdata);
1544                 ieee80211_setup_sdata(sdata, type);
1545         }
1546 
1547         /* reset some values that shouldn't be kept across type changes */
1548         if (type == NL80211_IFTYPE_STATION)
1549                 sdata->u.mgd.use_4addr = false;
1550 
1551         return 0;
1552 }
1553 
1554 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1555                                        u8 *perm_addr, enum nl80211_iftype type)
1556 {
1557         struct ieee80211_sub_if_data *sdata;
1558         u64 mask, start, addr, val, inc;
1559         u8 *m;
1560         u8 tmp_addr[ETH_ALEN];
1561         int i;
1562 
1563         /* default ... something at least */
1564         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1565 
1566         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1567             local->hw.wiphy->n_addresses <= 1)
1568                 return;
1569 
1570         mutex_lock(&local->iflist_mtx);
1571 
1572         switch (type) {
1573         case NL80211_IFTYPE_MONITOR:
1574                 /* doesn't matter */
1575                 break;
1576         case NL80211_IFTYPE_WDS:
1577         case NL80211_IFTYPE_AP_VLAN:
1578                 /* match up with an AP interface */
1579                 list_for_each_entry(sdata, &local->interfaces, list) {
1580                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1581                                 continue;
1582                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1583                         break;
1584                 }
1585                 /* keep default if no AP interface present */
1586                 break;
1587         case NL80211_IFTYPE_P2P_CLIENT:
1588         case NL80211_IFTYPE_P2P_GO:
1589                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1590                         list_for_each_entry(sdata, &local->interfaces, list) {
1591                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1592                                         continue;
1593                                 if (!ieee80211_sdata_running(sdata))
1594                                         continue;
1595                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1596                                 goto out_unlock;
1597                         }
1598                 }
1599                 /* otherwise fall through */
1600         default:
1601                 /* assign a new address if possible -- try n_addresses first */
1602                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1603                         bool used = false;
1604 
1605                         list_for_each_entry(sdata, &local->interfaces, list) {
1606                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1607                                                      sdata->vif.addr)) {
1608                                         used = true;
1609                                         break;
1610                                 }
1611                         }
1612 
1613                         if (!used) {
1614                                 memcpy(perm_addr,
1615                                        local->hw.wiphy->addresses[i].addr,
1616                                        ETH_ALEN);
1617                                 break;
1618                         }
1619                 }
1620 
1621                 /* try mask if available */
1622                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1623                         break;
1624 
1625                 m = local->hw.wiphy->addr_mask;
1626                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1627                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1628                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1629 
1630                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1631                         /* not a contiguous mask ... not handled now! */
1632                         pr_info("not contiguous\n");
1633                         break;
1634                 }
1635 
1636                 /*
1637                  * Pick address of existing interface in case user changed
1638                  * MAC address manually, default to perm_addr.
1639                  */
1640                 m = local->hw.wiphy->perm_addr;
1641                 list_for_each_entry(sdata, &local->interfaces, list) {
1642                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1643                                 continue;
1644                         m = sdata->vif.addr;
1645                         break;
1646                 }
1647                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1648                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1649                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1650 
1651                 inc = 1ULL<<__ffs64(mask);
1652                 val = (start & mask);
1653                 addr = (start & ~mask) | (val & mask);
1654                 do {
1655                         bool used = false;
1656 
1657                         tmp_addr[5] = addr >> 0*8;
1658                         tmp_addr[4] = addr >> 1*8;
1659                         tmp_addr[3] = addr >> 2*8;
1660                         tmp_addr[2] = addr >> 3*8;
1661                         tmp_addr[1] = addr >> 4*8;
1662                         tmp_addr[0] = addr >> 5*8;
1663 
1664                         val += inc;
1665 
1666                         list_for_each_entry(sdata, &local->interfaces, list) {
1667                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1668                                         used = true;
1669                                         break;
1670                                 }
1671                         }
1672 
1673                         if (!used) {
1674                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1675                                 break;
1676                         }
1677                         addr = (start & ~mask) | (val & mask);
1678                 } while (addr != start);
1679 
1680                 break;
1681         }
1682 
1683  out_unlock:
1684         mutex_unlock(&local->iflist_mtx);
1685 }
1686 
1687 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1688                      unsigned char name_assign_type,
1689                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1690                      struct vif_params *params)
1691 {
1692         struct net_device *ndev = NULL;
1693         struct ieee80211_sub_if_data *sdata = NULL;
1694         struct txq_info *txqi;
1695         int ret, i;
1696         int txqs = 1;
1697 
1698         ASSERT_RTNL();
1699 
1700         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1701                 struct wireless_dev *wdev;
1702 
1703                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1704                                 GFP_KERNEL);
1705                 if (!sdata)
1706                         return -ENOMEM;
1707                 wdev = &sdata->wdev;
1708 
1709                 sdata->dev = NULL;
1710                 strlcpy(sdata->name, name, IFNAMSIZ);
1711                 ieee80211_assign_perm_addr(local, wdev->address, type);
1712                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1713         } else {
1714                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1715                                  sizeof(void *));
1716                 int txq_size = 0;
1717 
1718                 if (local->ops->wake_tx_queue)
1719                         txq_size += sizeof(struct txq_info) +
1720                                     local->hw.txq_data_size;
1721 
1722                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1723                         txqs = IEEE80211_NUM_ACS;
1724 
1725                 ndev = alloc_netdev_mqs(size + txq_size,
1726                                         name, name_assign_type,
1727                                         ieee80211_if_setup, txqs, 1);
1728                 if (!ndev)
1729                         return -ENOMEM;
1730                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1731 
1732                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1733                 if (!ndev->tstats) {
1734                         free_netdev(ndev);
1735                         return -ENOMEM;
1736                 }
1737 
1738                 ndev->needed_headroom = local->tx_headroom +
1739                                         4*6 /* four MAC addresses */
1740                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1741                                         + 6 /* mesh */
1742                                         + 8 /* rfc1042/bridge tunnel */
1743                                         - ETH_HLEN /* ethernet hard_header_len */
1744                                         + IEEE80211_ENCRYPT_HEADROOM;
1745                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1746 
1747                 ret = dev_alloc_name(ndev, ndev->name);
1748                 if (ret < 0) {
1749                         free_netdev(ndev);
1750                         return ret;
1751                 }
1752 
1753                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1754                 if (params && is_valid_ether_addr(params->macaddr))
1755                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1756                 else
1757                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1758                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1759 
1760                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1761                 sdata = netdev_priv(ndev);
1762                 ndev->ieee80211_ptr = &sdata->wdev;
1763                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1764                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1765 
1766                 if (txq_size) {
1767                         txqi = netdev_priv(ndev) + size;
1768                         ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1769                 }
1770 
1771                 sdata->dev = ndev;
1772         }
1773 
1774         /* initialise type-independent data */
1775         sdata->wdev.wiphy = local->hw.wiphy;
1776         sdata->local = local;
1777 
1778         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1779                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1780 
1781         INIT_LIST_HEAD(&sdata->key_list);
1782 
1783         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1784                           ieee80211_dfs_cac_timer_work);
1785         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1786                           ieee80211_delayed_tailroom_dec);
1787 
1788         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1789                 struct ieee80211_supported_band *sband;
1790                 sband = local->hw.wiphy->bands[i];
1791                 sdata->rc_rateidx_mask[i] =
1792                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1793                 if (sband)
1794                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1795                                sband->ht_cap.mcs.rx_mask,
1796                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1797                 else
1798                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1799                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1800         }
1801 
1802         ieee80211_set_default_queues(sdata);
1803 
1804         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1805         sdata->user_power_level = local->user_power_level;
1806 
1807         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1808 
1809         /* setup type-dependent data */
1810         ieee80211_setup_sdata(sdata, type);
1811 
1812         if (ndev) {
1813                 if (params) {
1814                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1815                         if (type == NL80211_IFTYPE_STATION)
1816                                 sdata->u.mgd.use_4addr = params->use_4addr;
1817                 }
1818 
1819                 ndev->features |= local->hw.netdev_features;
1820 
1821                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1822 
1823                 ret = register_netdevice(ndev);
1824                 if (ret) {
1825                         free_netdev(ndev);
1826                         return ret;
1827                 }
1828         }
1829 
1830         mutex_lock(&local->iflist_mtx);
1831         list_add_tail_rcu(&sdata->list, &local->interfaces);
1832         mutex_unlock(&local->iflist_mtx);
1833 
1834         if (new_wdev)
1835                 *new_wdev = &sdata->wdev;
1836 
1837         return 0;
1838 }
1839 
1840 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1841 {
1842         ASSERT_RTNL();
1843 
1844         mutex_lock(&sdata->local->iflist_mtx);
1845         list_del_rcu(&sdata->list);
1846         mutex_unlock(&sdata->local->iflist_mtx);
1847 
1848         synchronize_rcu();
1849 
1850         if (sdata->dev) {
1851                 unregister_netdevice(sdata->dev);
1852         } else {
1853                 cfg80211_unregister_wdev(&sdata->wdev);
1854                 kfree(sdata);
1855         }
1856 }
1857 
1858 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1859 {
1860         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1861                 return;
1862         ieee80211_do_stop(sdata, true);
1863         ieee80211_teardown_sdata(sdata);
1864 }
1865 
1866 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1867 {
1868         struct ieee80211_sub_if_data *sdata, *tmp;
1869         LIST_HEAD(unreg_list);
1870         LIST_HEAD(wdev_list);
1871 
1872         ASSERT_RTNL();
1873 
1874         /* Before destroying the interfaces, make sure they're all stopped so
1875          * that the hardware is stopped. Otherwise, the driver might still be
1876          * iterating the interfaces during the shutdown, e.g. from a worker
1877          * or from RX processing or similar, and if it does so (using atomic
1878          * iteration) while we're manipulating the list, the iteration will
1879          * crash.
1880          *
1881          * After this, the hardware should be stopped and the driver should
1882          * have stopped all of its activities, so that we can do RCU-unaware
1883          * manipulations of the interface list below.
1884          */
1885         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1886 
1887         WARN(local->open_count, "%s: open count remains %d\n",
1888              wiphy_name(local->hw.wiphy), local->open_count);
1889 
1890         mutex_lock(&local->iflist_mtx);
1891         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1892                 list_del(&sdata->list);
1893 
1894                 if (sdata->dev)
1895                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1896                 else
1897                         list_add(&sdata->list, &wdev_list);
1898         }
1899         mutex_unlock(&local->iflist_mtx);
1900         unregister_netdevice_many(&unreg_list);
1901 
1902         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1903                 list_del(&sdata->list);
1904                 cfg80211_unregister_wdev(&sdata->wdev);
1905                 kfree(sdata);
1906         }
1907 }
1908 
1909 static int netdev_notify(struct notifier_block *nb,
1910                          unsigned long state, void *ptr)
1911 {
1912         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1913         struct ieee80211_sub_if_data *sdata;
1914 
1915         if (state != NETDEV_CHANGENAME)
1916                 return NOTIFY_DONE;
1917 
1918         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1919                 return NOTIFY_DONE;
1920 
1921         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1922                 return NOTIFY_DONE;
1923 
1924         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1925         memcpy(sdata->name, dev->name, IFNAMSIZ);
1926         ieee80211_debugfs_rename_netdev(sdata);
1927 
1928         return NOTIFY_OK;
1929 }
1930 
1931 static struct notifier_block mac80211_netdev_notifier = {
1932         .notifier_call = netdev_notify,
1933 };
1934 
1935 int ieee80211_iface_init(void)
1936 {
1937         return register_netdevice_notifier(&mac80211_netdev_notifier);
1938 }
1939 
1940 void ieee80211_iface_exit(void)
1941 {
1942         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1943 }
1944 

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