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TOMOYO Linux Cross Reference
Linux/net/mac80211/iface.c

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  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  * Copyright (c) 2016        Intel Deutschland GmbH
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License version 2 as
 13  * published by the Free Software Foundation.
 14  */
 15 #include <linux/slab.h>
 16 #include <linux/kernel.h>
 17 #include <linux/if_arp.h>
 18 #include <linux/netdevice.h>
 19 #include <linux/rtnetlink.h>
 20 #include <net/mac80211.h>
 21 #include <net/ieee80211_radiotap.h>
 22 #include "ieee80211_i.h"
 23 #include "sta_info.h"
 24 #include "debugfs_netdev.h"
 25 #include "mesh.h"
 26 #include "led.h"
 27 #include "driver-ops.h"
 28 #include "wme.h"
 29 #include "rate.h"
 30 
 31 /**
 32  * DOC: Interface list locking
 33  *
 34  * The interface list in each struct ieee80211_local is protected
 35  * three-fold:
 36  *
 37  * (1) modifications may only be done under the RTNL
 38  * (2) modifications and readers are protected against each other by
 39  *     the iflist_mtx.
 40  * (3) modifications are done in an RCU manner so atomic readers
 41  *     can traverse the list in RCU-safe blocks.
 42  *
 43  * As a consequence, reads (traversals) of the list can be protected
 44  * by either the RTNL, the iflist_mtx or RCU.
 45  */
 46 
 47 static void ieee80211_iface_work(struct work_struct *work);
 48 
 49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 50 {
 51         struct ieee80211_chanctx_conf *chanctx_conf;
 52         int power;
 53 
 54         rcu_read_lock();
 55         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 56         if (!chanctx_conf) {
 57                 rcu_read_unlock();
 58                 return false;
 59         }
 60 
 61         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 62         rcu_read_unlock();
 63 
 64         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 65                 power = min(power, sdata->user_power_level);
 66 
 67         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 68                 power = min(power, sdata->ap_power_level);
 69 
 70         if (power != sdata->vif.bss_conf.txpower) {
 71                 sdata->vif.bss_conf.txpower = power;
 72                 ieee80211_hw_config(sdata->local, 0);
 73                 return true;
 74         }
 75 
 76         return false;
 77 }
 78 
 79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 80                               bool update_bss)
 81 {
 82         if (__ieee80211_recalc_txpower(sdata) ||
 83             (update_bss && ieee80211_sdata_running(sdata)))
 84                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 85 }
 86 
 87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 88 {
 89         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 90                 return 0;
 91 
 92         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 93         return IEEE80211_CONF_CHANGE_IDLE;
 94 }
 95 
 96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 97 {
 98         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 99                 return 0;
100 
101         ieee80211_flush_queues(local, NULL, false);
102 
103         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104         return IEEE80211_CONF_CHANGE_IDLE;
105 }
106 
107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108                                    bool force_active)
109 {
110         bool working, scanning, active;
111         unsigned int led_trig_start = 0, led_trig_stop = 0;
112 
113         lockdep_assert_held(&local->mtx);
114 
115         active = force_active ||
116                  !list_empty(&local->chanctx_list) ||
117                  local->monitors;
118 
119         working = !local->ops->remain_on_channel &&
120                   !list_empty(&local->roc_list);
121 
122         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124 
125         if (working || scanning)
126                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127         else
128                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129 
130         if (active)
131                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132         else
133                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134 
135         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136 
137         if (working || scanning || active)
138                 return __ieee80211_idle_off(local);
139         return __ieee80211_idle_on(local);
140 }
141 
142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144         return __ieee80211_recalc_idle(local, true);
145 }
146 
147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149         u32 change = __ieee80211_recalc_idle(local, false);
150         if (change)
151                 ieee80211_hw_config(local, change);
152 }
153 
154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155                                 bool check_dup)
156 {
157         struct ieee80211_local *local = sdata->local;
158         struct ieee80211_sub_if_data *iter;
159         u64 new, mask, tmp;
160         u8 *m;
161         int ret = 0;
162 
163         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164                 return 0;
165 
166         m = addr;
167         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170 
171         m = local->hw.wiphy->addr_mask;
172         mask =  ((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         if (!check_dup)
177                 return ret;
178 
179         mutex_lock(&local->iflist_mtx);
180         list_for_each_entry(iter, &local->interfaces, list) {
181                 if (iter == sdata)
182                         continue;
183 
184                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186                         continue;
187 
188                 m = iter->vif.addr;
189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192 
193                 if ((new & ~mask) != (tmp & ~mask)) {
194                         ret = -EINVAL;
195                         break;
196                 }
197         }
198         mutex_unlock(&local->iflist_mtx);
199 
200         return ret;
201 }
202 
203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
204 {
205         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
206         struct sockaddr *sa = addr;
207         bool check_dup = true;
208         int ret;
209 
210         if (ieee80211_sdata_running(sdata))
211                 return -EBUSY;
212 
213         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
214             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
215                 check_dup = false;
216 
217         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
218         if (ret)
219                 return ret;
220 
221         ret = eth_mac_addr(dev, sa);
222 
223         if (ret == 0)
224                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
225 
226         return ret;
227 }
228 
229 static inline int identical_mac_addr_allowed(int type1, int type2)
230 {
231         return type1 == NL80211_IFTYPE_MONITOR ||
232                 type2 == NL80211_IFTYPE_MONITOR ||
233                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
234                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
235                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
236                 (type1 == NL80211_IFTYPE_WDS &&
237                         (type2 == NL80211_IFTYPE_WDS ||
238                          type2 == NL80211_IFTYPE_AP)) ||
239                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
240                 (type1 == NL80211_IFTYPE_AP_VLAN &&
241                         (type2 == NL80211_IFTYPE_AP ||
242                          type2 == NL80211_IFTYPE_AP_VLAN));
243 }
244 
245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
246                                             enum nl80211_iftype iftype)
247 {
248         struct ieee80211_local *local = sdata->local;
249         struct ieee80211_sub_if_data *nsdata;
250         int ret;
251 
252         ASSERT_RTNL();
253 
254         /* we hold the RTNL here so can safely walk the list */
255         list_for_each_entry(nsdata, &local->interfaces, list) {
256                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
257                         /*
258                          * Only OCB and monitor mode may coexist
259                          */
260                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
261                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
262                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
263                              nsdata->vif.type == NL80211_IFTYPE_OCB))
264                                 return -EBUSY;
265 
266                         /*
267                          * Allow only a single IBSS interface to be up at any
268                          * time. This is restricted because beacon distribution
269                          * cannot work properly if both are in the same IBSS.
270                          *
271                          * To remove this restriction we'd have to disallow them
272                          * from setting the same SSID on different IBSS interfaces
273                          * belonging to the same hardware. Then, however, we're
274                          * faced with having to adopt two different TSF timers...
275                          */
276                         if (iftype == NL80211_IFTYPE_ADHOC &&
277                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
278                                 return -EBUSY;
279                         /*
280                          * will not add another interface while any channel
281                          * switch is active.
282                          */
283                         if (nsdata->vif.csa_active)
284                                 return -EBUSY;
285 
286                         /*
287                          * The remaining checks are only performed for interfaces
288                          * with the same MAC address.
289                          */
290                         if (!ether_addr_equal(sdata->vif.addr,
291                                               nsdata->vif.addr))
292                                 continue;
293 
294                         /*
295                          * check whether it may have the same address
296                          */
297                         if (!identical_mac_addr_allowed(iftype,
298                                                         nsdata->vif.type))
299                                 return -ENOTUNIQ;
300 
301                         /*
302                          * can only add VLANs to enabled APs
303                          */
304                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
305                             nsdata->vif.type == NL80211_IFTYPE_AP)
306                                 sdata->bss = &nsdata->u.ap;
307                 }
308         }
309 
310         mutex_lock(&local->chanctx_mtx);
311         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
312         mutex_unlock(&local->chanctx_mtx);
313         return ret;
314 }
315 
316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
317                                   enum nl80211_iftype iftype)
318 {
319         int n_queues = sdata->local->hw.queues;
320         int i;
321 
322         if (iftype == NL80211_IFTYPE_NAN)
323                 return 0;
324 
325         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
326                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
327                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
328                                          IEEE80211_INVAL_HW_QUEUE))
329                                 return -EINVAL;
330                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
331                                          n_queues))
332                                 return -EINVAL;
333                 }
334         }
335 
336         if ((iftype != NL80211_IFTYPE_AP &&
337              iftype != NL80211_IFTYPE_P2P_GO &&
338              iftype != NL80211_IFTYPE_MESH_POINT) ||
339             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
340                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341                 return 0;
342         }
343 
344         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
345                 return -EINVAL;
346 
347         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
348                 return -EINVAL;
349 
350         return 0;
351 }
352 
353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
354                                     const int offset)
355 {
356         struct ieee80211_local *local = sdata->local;
357         u32 flags = sdata->u.mntr.flags;
358 
359 #define ADJUST(_f, _s)  do {                                    \
360         if (flags & MONITOR_FLAG_##_f)                          \
361                 local->fif_##_s += offset;                      \
362         } while (0)
363 
364         ADJUST(FCSFAIL, fcsfail);
365         ADJUST(PLCPFAIL, plcpfail);
366         ADJUST(CONTROL, control);
367         ADJUST(CONTROL, pspoll);
368         ADJUST(OTHER_BSS, other_bss);
369 
370 #undef ADJUST
371 }
372 
373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
374 {
375         struct ieee80211_local *local = sdata->local;
376         int i;
377 
378         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
379                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
380                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
381                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
382                         sdata->vif.hw_queue[i] = i;
383                 else
384                         sdata->vif.hw_queue[i] = 0;
385         }
386         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
387 }
388 
389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
390 {
391         struct ieee80211_sub_if_data *sdata;
392         int ret;
393 
394         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
395                 return 0;
396 
397         ASSERT_RTNL();
398 
399         if (local->monitor_sdata)
400                 return 0;
401 
402         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
403         if (!sdata)
404                 return -ENOMEM;
405 
406         /* set up data */
407         sdata->local = local;
408         sdata->vif.type = NL80211_IFTYPE_MONITOR;
409         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
410                  wiphy_name(local->hw.wiphy));
411         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
412 
413         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
414 
415         ieee80211_set_default_queues(sdata);
416 
417         ret = drv_add_interface(local, sdata);
418         if (WARN_ON(ret)) {
419                 /* ok .. stupid driver, it asked for this! */
420                 kfree(sdata);
421                 return ret;
422         }
423 
424         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
425         if (ret) {
426                 kfree(sdata);
427                 return ret;
428         }
429 
430         mutex_lock(&local->iflist_mtx);
431         rcu_assign_pointer(local->monitor_sdata, sdata);
432         mutex_unlock(&local->iflist_mtx);
433 
434         mutex_lock(&local->mtx);
435         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
436                                         IEEE80211_CHANCTX_EXCLUSIVE);
437         mutex_unlock(&local->mtx);
438         if (ret) {
439                 mutex_lock(&local->iflist_mtx);
440                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
441                 mutex_unlock(&local->iflist_mtx);
442                 synchronize_net();
443                 drv_remove_interface(local, sdata);
444                 kfree(sdata);
445                 return ret;
446         }
447 
448         skb_queue_head_init(&sdata->skb_queue);
449         INIT_WORK(&sdata->work, ieee80211_iface_work);
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         case NL80211_IFTYPE_NAN:
544                 /* no special treatment */
545                 break;
546         case NL80211_IFTYPE_UNSPECIFIED:
547         case NUM_NL80211_IFTYPES:
548         case NL80211_IFTYPE_P2P_CLIENT:
549         case NL80211_IFTYPE_P2P_GO:
550                 /* cannot happen */
551                 WARN_ON(1);
552                 break;
553         }
554 
555         if (local->open_count == 0) {
556                 res = drv_start(local);
557                 if (res)
558                         goto err_del_bss;
559                 /* we're brought up, everything changes */
560                 hw_reconf_flags = ~0;
561                 ieee80211_led_radio(local, true);
562                 ieee80211_mod_tpt_led_trig(local,
563                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
564         }
565 
566         /*
567          * Copy the hopefully now-present MAC address to
568          * this interface, if it has the special null one.
569          */
570         if (dev && is_zero_ether_addr(dev->dev_addr)) {
571                 memcpy(dev->dev_addr,
572                        local->hw.wiphy->perm_addr,
573                        ETH_ALEN);
574                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
575 
576                 if (!is_valid_ether_addr(dev->dev_addr)) {
577                         res = -EADDRNOTAVAIL;
578                         goto err_stop;
579                 }
580         }
581 
582         switch (sdata->vif.type) {
583         case NL80211_IFTYPE_AP_VLAN:
584                 /* no need to tell driver, but set carrier and chanctx */
585                 if (rtnl_dereference(sdata->bss->beacon)) {
586                         ieee80211_vif_vlan_copy_chanctx(sdata);
587                         netif_carrier_on(dev);
588                 } else {
589                         netif_carrier_off(dev);
590                 }
591                 break;
592         case NL80211_IFTYPE_MONITOR:
593                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
594                         local->cooked_mntrs++;
595                         break;
596                 }
597 
598                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
599                         res = drv_add_interface(local, sdata);
600                         if (res)
601                                 goto err_stop;
602                 } else if (local->monitors == 0 && local->open_count == 0) {
603                         res = ieee80211_add_virtual_monitor(local);
604                         if (res)
605                                 goto err_stop;
606                 }
607 
608                 /* must be before the call to ieee80211_configure_filter */
609                 local->monitors++;
610                 if (local->monitors == 1) {
611                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
612                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
613                 }
614 
615                 ieee80211_adjust_monitor_flags(sdata, 1);
616                 ieee80211_configure_filter(local);
617                 mutex_lock(&local->mtx);
618                 ieee80211_recalc_idle(local);
619                 mutex_unlock(&local->mtx);
620 
621                 netif_carrier_on(dev);
622                 break;
623         default:
624                 if (coming_up) {
625                         ieee80211_del_virtual_monitor(local);
626 
627                         res = drv_add_interface(local, sdata);
628                         if (res)
629                                 goto err_stop;
630                         res = ieee80211_check_queues(sdata,
631                                 ieee80211_vif_type_p2p(&sdata->vif));
632                         if (res)
633                                 goto err_del_interface;
634                 }
635 
636                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
637                         local->fif_pspoll++;
638                         local->fif_probe_req++;
639 
640                         ieee80211_configure_filter(local);
641                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
642                         local->fif_probe_req++;
643                 }
644 
645                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
646                     sdata->vif.type != NL80211_IFTYPE_NAN)
647                         changed |= ieee80211_reset_erp_info(sdata);
648                 ieee80211_bss_info_change_notify(sdata, changed);
649 
650                 switch (sdata->vif.type) {
651                 case NL80211_IFTYPE_STATION:
652                 case NL80211_IFTYPE_ADHOC:
653                 case NL80211_IFTYPE_AP:
654                 case NL80211_IFTYPE_MESH_POINT:
655                 case NL80211_IFTYPE_OCB:
656                         netif_carrier_off(dev);
657                         break;
658                 case NL80211_IFTYPE_WDS:
659                 case NL80211_IFTYPE_P2P_DEVICE:
660                 case NL80211_IFTYPE_NAN:
661                         break;
662                 default:
663                         /* not reached */
664                         WARN_ON(1);
665                 }
666 
667                 /*
668                  * Set default queue parameters so drivers don't
669                  * need to initialise the hardware if the hardware
670                  * doesn't start up with sane defaults.
671                  * Enable QoS for anything but station interfaces.
672                  */
673                 ieee80211_set_wmm_default(sdata, true,
674                         sdata->vif.type != NL80211_IFTYPE_STATION);
675         }
676 
677         set_bit(SDATA_STATE_RUNNING, &sdata->state);
678 
679         switch (sdata->vif.type) {
680         case NL80211_IFTYPE_WDS:
681                 /* Create STA entry for the WDS peer */
682                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
683                                      GFP_KERNEL);
684                 if (!sta) {
685                         res = -ENOMEM;
686                         goto err_del_interface;
687                 }
688 
689                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
690                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
691                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
692 
693                 res = sta_info_insert(sta);
694                 if (res) {
695                         /* STA has been freed */
696                         goto err_del_interface;
697                 }
698 
699                 rate_control_rate_init(sta);
700                 netif_carrier_on(dev);
701                 break;
702         case NL80211_IFTYPE_P2P_DEVICE:
703                 rcu_assign_pointer(local->p2p_sdata, sdata);
704                 break;
705         case NL80211_IFTYPE_MONITOR:
706                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
707                         break;
708                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
709                 break;
710         default:
711                 break;
712         }
713 
714         /*
715          * set_multicast_list will be invoked by the networking core
716          * which will check whether any increments here were done in
717          * error and sync them down to the hardware as filter flags.
718          */
719         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
720                 atomic_inc(&local->iff_allmultis);
721 
722         if (coming_up)
723                 local->open_count++;
724 
725         if (hw_reconf_flags)
726                 ieee80211_hw_config(local, hw_reconf_flags);
727 
728         ieee80211_recalc_ps(local);
729 
730         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
731             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
732             local->ops->wake_tx_queue) {
733                 /* XXX: for AP_VLAN, actually track AP queues */
734                 if (dev)
735                         netif_tx_start_all_queues(dev);
736         } else if (dev) {
737                 unsigned long flags;
738                 int n_acs = IEEE80211_NUM_ACS;
739                 int ac;
740 
741                 if (local->hw.queues < IEEE80211_NUM_ACS)
742                         n_acs = 1;
743 
744                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
745                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
746                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
747                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
748                         for (ac = 0; ac < n_acs; ac++) {
749                                 int ac_queue = sdata->vif.hw_queue[ac];
750 
751                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
752                                     skb_queue_empty(&local->pending[ac_queue]))
753                                         netif_start_subqueue(dev, ac);
754                         }
755                 }
756                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
757         }
758 
759         return 0;
760  err_del_interface:
761         drv_remove_interface(local, sdata);
762  err_stop:
763         if (!local->open_count)
764                 drv_stop(local);
765  err_del_bss:
766         sdata->bss = NULL;
767         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
768                 mutex_lock(&local->mtx);
769                 list_del(&sdata->u.vlan.list);
770                 mutex_unlock(&local->mtx);
771         }
772         /* might already be clear but that doesn't matter */
773         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
774         return res;
775 }
776 
777 static int ieee80211_open(struct net_device *dev)
778 {
779         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
780         int err;
781 
782         /* fail early if user set an invalid address */
783         if (!is_valid_ether_addr(dev->dev_addr))
784                 return -EADDRNOTAVAIL;
785 
786         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
787         if (err)
788                 return err;
789 
790         return ieee80211_do_open(&sdata->wdev, true);
791 }
792 
793 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
794                               bool going_down)
795 {
796         struct ieee80211_local *local = sdata->local;
797         unsigned long flags;
798         struct sk_buff *skb, *tmp;
799         u32 hw_reconf_flags = 0;
800         int i, flushed;
801         struct ps_data *ps;
802         struct cfg80211_chan_def chandef;
803         bool cancel_scan;
804         struct cfg80211_nan_func *func;
805 
806         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
807 
808         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
809         if (cancel_scan)
810                 ieee80211_scan_cancel(local);
811 
812         /*
813          * Stop TX on this interface first.
814          */
815         if (sdata->dev)
816                 netif_tx_stop_all_queues(sdata->dev);
817 
818         ieee80211_roc_purge(local, sdata);
819 
820         switch (sdata->vif.type) {
821         case NL80211_IFTYPE_STATION:
822                 ieee80211_mgd_stop(sdata);
823                 break;
824         case NL80211_IFTYPE_ADHOC:
825                 ieee80211_ibss_stop(sdata);
826                 break;
827         case NL80211_IFTYPE_AP:
828                 cancel_work_sync(&sdata->u.ap.request_smps_work);
829                 break;
830         case NL80211_IFTYPE_MONITOR:
831                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
832                         break;
833                 list_del_rcu(&sdata->u.mntr.list);
834                 break;
835         default:
836                 break;
837         }
838 
839         /*
840          * Remove all stations associated with this interface.
841          *
842          * This must be done before calling ops->remove_interface()
843          * because otherwise we can later invoke ops->sta_notify()
844          * whenever the STAs are removed, and that invalidates driver
845          * assumptions about always getting a vif pointer that is valid
846          * (because if we remove a STA after ops->remove_interface()
847          * the driver will have removed the vif info already!)
848          *
849          * In WDS mode a station must exist here and be flushed, for
850          * AP_VLANs stations may exist since there's nothing else that
851          * would have removed them, but in other modes there shouldn't
852          * be any stations.
853          */
854         flushed = sta_info_flush(sdata);
855         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
856                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
857                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
858 
859         /* don't count this interface for allmulti while it is down */
860         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
861                 atomic_dec(&local->iff_allmultis);
862 
863         if (sdata->vif.type == NL80211_IFTYPE_AP) {
864                 local->fif_pspoll--;
865                 local->fif_probe_req--;
866         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
867                 local->fif_probe_req--;
868         }
869 
870         if (sdata->dev) {
871                 netif_addr_lock_bh(sdata->dev);
872                 spin_lock_bh(&local->filter_lock);
873                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
874                                  sdata->dev->addr_len);
875                 spin_unlock_bh(&local->filter_lock);
876                 netif_addr_unlock_bh(sdata->dev);
877         }
878 
879         del_timer_sync(&local->dynamic_ps_timer);
880         cancel_work_sync(&local->dynamic_ps_enable_work);
881 
882         cancel_work_sync(&sdata->recalc_smps);
883         sdata_lock(sdata);
884         mutex_lock(&local->mtx);
885         sdata->vif.csa_active = false;
886         if (sdata->vif.type == NL80211_IFTYPE_STATION)
887                 sdata->u.mgd.csa_waiting_bcn = false;
888         if (sdata->csa_block_tx) {
889                 ieee80211_wake_vif_queues(local, sdata,
890                                           IEEE80211_QUEUE_STOP_REASON_CSA);
891                 sdata->csa_block_tx = false;
892         }
893         mutex_unlock(&local->mtx);
894         sdata_unlock(sdata);
895 
896         cancel_work_sync(&sdata->csa_finalize_work);
897 
898         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
899 
900         if (sdata->wdev.cac_started) {
901                 chandef = sdata->vif.bss_conf.chandef;
902                 WARN_ON(local->suspended);
903                 mutex_lock(&local->mtx);
904                 ieee80211_vif_release_channel(sdata);
905                 mutex_unlock(&local->mtx);
906                 cfg80211_cac_event(sdata->dev, &chandef,
907                                    NL80211_RADAR_CAC_ABORTED,
908                                    GFP_KERNEL);
909         }
910 
911         /* APs need special treatment */
912         if (sdata->vif.type == NL80211_IFTYPE_AP) {
913                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
914 
915                 /* down all dependent devices, that is VLANs */
916                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
917                                          u.vlan.list)
918                         dev_close(vlan->dev);
919                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
920         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
921                 /* remove all packets in parent bc_buf pointing to this dev */
922                 ps = &sdata->bss->ps;
923 
924                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
925                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
926                         if (skb->dev == sdata->dev) {
927                                 __skb_unlink(skb, &ps->bc_buf);
928                                 local->total_ps_buffered--;
929                                 ieee80211_free_txskb(&local->hw, skb);
930                         }
931                 }
932                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
933         }
934 
935         if (going_down)
936                 local->open_count--;
937 
938         switch (sdata->vif.type) {
939         case NL80211_IFTYPE_AP_VLAN:
940                 mutex_lock(&local->mtx);
941                 list_del(&sdata->u.vlan.list);
942                 mutex_unlock(&local->mtx);
943                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
944                 /* see comment in the default case below */
945                 ieee80211_free_keys(sdata, true);
946                 /* no need to tell driver */
947                 break;
948         case NL80211_IFTYPE_MONITOR:
949                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
950                         local->cooked_mntrs--;
951                         break;
952                 }
953 
954                 local->monitors--;
955                 if (local->monitors == 0) {
956                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
957                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
958                 }
959 
960                 ieee80211_adjust_monitor_flags(sdata, -1);
961                 break;
962         case NL80211_IFTYPE_NAN:
963                 /* clean all the functions */
964                 spin_lock_bh(&sdata->u.nan.func_lock);
965 
966                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
967                         idr_remove(&sdata->u.nan.function_inst_ids, i);
968                         cfg80211_free_nan_func(func);
969                 }
970                 idr_destroy(&sdata->u.nan.function_inst_ids);
971 
972                 spin_unlock_bh(&sdata->u.nan.func_lock);
973                 break;
974         case NL80211_IFTYPE_P2P_DEVICE:
975                 /* relies on synchronize_rcu() below */
976                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
977                 /* fall through */
978         default:
979                 cancel_work_sync(&sdata->work);
980                 /*
981                  * When we get here, the interface is marked down.
982                  * Free the remaining keys, if there are any
983                  * (which can happen in AP mode if userspace sets
984                  * keys before the interface is operating, and maybe
985                  * also in WDS mode)
986                  *
987                  * Force the key freeing to always synchronize_net()
988                  * to wait for the RX path in case it is using this
989                  * interface enqueuing frames at this very time on
990                  * another CPU.
991                  */
992                 ieee80211_free_keys(sdata, true);
993                 skb_queue_purge(&sdata->skb_queue);
994         }
995 
996         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
997         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
998                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
999                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1000                         if (info->control.vif == &sdata->vif) {
1001                                 __skb_unlink(skb, &local->pending[i]);
1002                                 ieee80211_free_txskb(&local->hw, skb);
1003                         }
1004                 }
1005         }
1006         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1007 
1008         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1009                 ieee80211_txq_remove_vlan(local, sdata);
1010 
1011         sdata->bss = NULL;
1012 
1013         if (local->open_count == 0)
1014                 ieee80211_clear_tx_pending(local);
1015 
1016         /*
1017          * If the interface goes down while suspended, presumably because
1018          * the device was unplugged and that happens before our resume,
1019          * then the driver is already unconfigured and the remainder of
1020          * this function isn't needed.
1021          * XXX: what about WoWLAN? If the device has software state, e.g.
1022          *      memory allocated, it might expect teardown commands from
1023          *      mac80211 here?
1024          */
1025         if (local->suspended) {
1026                 WARN_ON(local->wowlan);
1027                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1028                 return;
1029         }
1030 
1031         switch (sdata->vif.type) {
1032         case NL80211_IFTYPE_AP_VLAN:
1033                 break;
1034         case NL80211_IFTYPE_MONITOR:
1035                 if (local->monitors == 0)
1036                         ieee80211_del_virtual_monitor(local);
1037 
1038                 mutex_lock(&local->mtx);
1039                 ieee80211_recalc_idle(local);
1040                 mutex_unlock(&local->mtx);
1041 
1042                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1043                         break;
1044 
1045                 /* fall through */
1046         default:
1047                 if (going_down)
1048                         drv_remove_interface(local, sdata);
1049         }
1050 
1051         ieee80211_recalc_ps(local);
1052 
1053         if (cancel_scan)
1054                 flush_delayed_work(&local->scan_work);
1055 
1056         if (local->open_count == 0) {
1057                 ieee80211_stop_device(local);
1058 
1059                 /* no reconfiguring after stop! */
1060                 return;
1061         }
1062 
1063         /* do after stop to avoid reconfiguring when we stop anyway */
1064         ieee80211_configure_filter(local);
1065         ieee80211_hw_config(local, hw_reconf_flags);
1066 
1067         if (local->monitors == local->open_count)
1068                 ieee80211_add_virtual_monitor(local);
1069 }
1070 
1071 static int ieee80211_stop(struct net_device *dev)
1072 {
1073         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1074 
1075         ieee80211_do_stop(sdata, true);
1076 
1077         return 0;
1078 }
1079 
1080 static void ieee80211_set_multicast_list(struct net_device *dev)
1081 {
1082         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1083         struct ieee80211_local *local = sdata->local;
1084         int allmulti, sdata_allmulti;
1085 
1086         allmulti = !!(dev->flags & IFF_ALLMULTI);
1087         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1088 
1089         if (allmulti != sdata_allmulti) {
1090                 if (dev->flags & IFF_ALLMULTI)
1091                         atomic_inc(&local->iff_allmultis);
1092                 else
1093                         atomic_dec(&local->iff_allmultis);
1094                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1095         }
1096 
1097         spin_lock_bh(&local->filter_lock);
1098         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1099         spin_unlock_bh(&local->filter_lock);
1100         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1101 }
1102 
1103 /*
1104  * Called when the netdev is removed or, by the code below, before
1105  * the interface type changes.
1106  */
1107 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1108 {
1109         int i;
1110 
1111         /* free extra data */
1112         ieee80211_free_keys(sdata, false);
1113 
1114         ieee80211_debugfs_remove_netdev(sdata);
1115 
1116         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1117                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1118         sdata->fragment_next = 0;
1119 
1120         if (ieee80211_vif_is_mesh(&sdata->vif))
1121                 ieee80211_mesh_teardown_sdata(sdata);
1122 }
1123 
1124 static void ieee80211_uninit(struct net_device *dev)
1125 {
1126         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1127 }
1128 
1129 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1130                                          struct sk_buff *skb,
1131                                          void *accel_priv,
1132                                          select_queue_fallback_t fallback)
1133 {
1134         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1135 }
1136 
1137 static void
1138 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1139 {
1140         int i;
1141 
1142         for_each_possible_cpu(i) {
1143                 const struct pcpu_sw_netstats *tstats;
1144                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1145                 unsigned int start;
1146 
1147                 tstats = per_cpu_ptr(dev->tstats, i);
1148 
1149                 do {
1150                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1151                         rx_packets = tstats->rx_packets;
1152                         tx_packets = tstats->tx_packets;
1153                         rx_bytes = tstats->rx_bytes;
1154                         tx_bytes = tstats->tx_bytes;
1155                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1156 
1157                 stats->rx_packets += rx_packets;
1158                 stats->tx_packets += tx_packets;
1159                 stats->rx_bytes   += rx_bytes;
1160                 stats->tx_bytes   += tx_bytes;
1161         }
1162 }
1163 
1164 static const struct net_device_ops ieee80211_dataif_ops = {
1165         .ndo_open               = ieee80211_open,
1166         .ndo_stop               = ieee80211_stop,
1167         .ndo_uninit             = ieee80211_uninit,
1168         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1169         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1170         .ndo_set_mac_address    = ieee80211_change_mac,
1171         .ndo_select_queue       = ieee80211_netdev_select_queue,
1172         .ndo_get_stats64        = ieee80211_get_stats64,
1173 };
1174 
1175 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1176                                           struct sk_buff *skb,
1177                                           void *accel_priv,
1178                                           select_queue_fallback_t fallback)
1179 {
1180         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181         struct ieee80211_local *local = sdata->local;
1182         struct ieee80211_hdr *hdr;
1183         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1184 
1185         if (local->hw.queues < IEEE80211_NUM_ACS)
1186                 return 0;
1187 
1188         if (skb->len < 4 ||
1189             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1190                 return 0; /* doesn't matter, frame will be dropped */
1191 
1192         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1193 
1194         return ieee80211_select_queue_80211(sdata, skb, hdr);
1195 }
1196 
1197 static const struct net_device_ops ieee80211_monitorif_ops = {
1198         .ndo_open               = ieee80211_open,
1199         .ndo_stop               = ieee80211_stop,
1200         .ndo_uninit             = ieee80211_uninit,
1201         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1202         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1203         .ndo_set_mac_address    = ieee80211_change_mac,
1204         .ndo_select_queue       = ieee80211_monitor_select_queue,
1205         .ndo_get_stats64        = ieee80211_get_stats64,
1206 };
1207 
1208 static void ieee80211_if_free(struct net_device *dev)
1209 {
1210         free_percpu(dev->tstats);
1211 }
1212 
1213 static void ieee80211_if_setup(struct net_device *dev)
1214 {
1215         ether_setup(dev);
1216         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1217         dev->netdev_ops = &ieee80211_dataif_ops;
1218         dev->needs_free_netdev = true;
1219         dev->priv_destructor = ieee80211_if_free;
1220 }
1221 
1222 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1223 {
1224         ieee80211_if_setup(dev);
1225         dev->priv_flags |= IFF_NO_QUEUE;
1226 }
1227 
1228 static void ieee80211_iface_work(struct work_struct *work)
1229 {
1230         struct ieee80211_sub_if_data *sdata =
1231                 container_of(work, struct ieee80211_sub_if_data, work);
1232         struct ieee80211_local *local = sdata->local;
1233         struct sk_buff *skb;
1234         struct sta_info *sta;
1235 
1236         if (!ieee80211_sdata_running(sdata))
1237                 return;
1238 
1239         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1240                 return;
1241 
1242         if (!ieee80211_can_run_worker(local))
1243                 return;
1244 
1245         /* first process frames */
1246         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1247                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1248 
1249                 if (ieee80211_is_action(mgmt->frame_control) &&
1250                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1251                         int len = skb->len;
1252 
1253                         mutex_lock(&local->sta_mtx);
1254                         sta = sta_info_get_bss(sdata, mgmt->sa);
1255                         if (sta) {
1256                                 switch (mgmt->u.action.u.addba_req.action_code) {
1257                                 case WLAN_ACTION_ADDBA_REQ:
1258                                         ieee80211_process_addba_request(
1259                                                         local, sta, mgmt, len);
1260                                         break;
1261                                 case WLAN_ACTION_ADDBA_RESP:
1262                                         ieee80211_process_addba_resp(local, sta,
1263                                                                      mgmt, len);
1264                                         break;
1265                                 case WLAN_ACTION_DELBA:
1266                                         ieee80211_process_delba(sdata, sta,
1267                                                                 mgmt, len);
1268                                         break;
1269                                 default:
1270                                         WARN_ON(1);
1271                                         break;
1272                                 }
1273                         }
1274                         mutex_unlock(&local->sta_mtx);
1275                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1276                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1277                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1278                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1279                                 struct ieee80211_rx_status *status;
1280                                 enum nl80211_band band;
1281                                 u8 opmode;
1282 
1283                                 status = IEEE80211_SKB_RXCB(skb);
1284                                 band = status->band;
1285                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1286 
1287                                 mutex_lock(&local->sta_mtx);
1288                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1289 
1290                                 if (sta)
1291                                         ieee80211_vht_handle_opmode(sdata, sta,
1292                                                                     opmode,
1293                                                                     band);
1294 
1295                                 mutex_unlock(&local->sta_mtx);
1296                                 break;
1297                         }
1298                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1299                                 ieee80211_process_mu_groups(sdata, mgmt);
1300                                 break;
1301                         default:
1302                                 WARN_ON(1);
1303                                 break;
1304                         }
1305                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1306                         struct ieee80211_hdr *hdr = (void *)mgmt;
1307                         /*
1308                          * So the frame isn't mgmt, but frame_control
1309                          * is at the right place anyway, of course, so
1310                          * the if statement is correct.
1311                          *
1312                          * Warn if we have other data frame types here,
1313                          * they must not get here.
1314                          */
1315                         WARN_ON(hdr->frame_control &
1316                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1317                         WARN_ON(!(hdr->seq_ctrl &
1318                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1319                         /*
1320                          * This was a fragment of a frame, received while
1321                          * a block-ack session was active. That cannot be
1322                          * right, so terminate the session.
1323                          */
1324                         mutex_lock(&local->sta_mtx);
1325                         sta = sta_info_get_bss(sdata, mgmt->sa);
1326                         if (sta) {
1327                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1328                                                 IEEE80211_QOS_CTL_TID_MASK;
1329 
1330                                 __ieee80211_stop_rx_ba_session(
1331                                         sta, tid, WLAN_BACK_RECIPIENT,
1332                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1333                                         true);
1334                         }
1335                         mutex_unlock(&local->sta_mtx);
1336                 } else switch (sdata->vif.type) {
1337                 case NL80211_IFTYPE_STATION:
1338                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1339                         break;
1340                 case NL80211_IFTYPE_ADHOC:
1341                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1342                         break;
1343                 case NL80211_IFTYPE_MESH_POINT:
1344                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1345                                 break;
1346                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1347                         break;
1348                 default:
1349                         WARN(1, "frame for unexpected interface type");
1350                         break;
1351                 }
1352 
1353                 kfree_skb(skb);
1354         }
1355 
1356         /* then other type-dependent work */
1357         switch (sdata->vif.type) {
1358         case NL80211_IFTYPE_STATION:
1359                 ieee80211_sta_work(sdata);
1360                 break;
1361         case NL80211_IFTYPE_ADHOC:
1362                 ieee80211_ibss_work(sdata);
1363                 break;
1364         case NL80211_IFTYPE_MESH_POINT:
1365                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1366                         break;
1367                 ieee80211_mesh_work(sdata);
1368                 break;
1369         case NL80211_IFTYPE_OCB:
1370                 ieee80211_ocb_work(sdata);
1371                 break;
1372         default:
1373                 break;
1374         }
1375 }
1376 
1377 static void ieee80211_recalc_smps_work(struct work_struct *work)
1378 {
1379         struct ieee80211_sub_if_data *sdata =
1380                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1381 
1382         ieee80211_recalc_smps(sdata);
1383 }
1384 
1385 /*
1386  * Helper function to initialise an interface to a specific type.
1387  */
1388 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1389                                   enum nl80211_iftype type)
1390 {
1391         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1392                                                     0xff, 0xff, 0xff};
1393 
1394         /* clear type-dependent union */
1395         memset(&sdata->u, 0, sizeof(sdata->u));
1396 
1397         /* and set some type-dependent values */
1398         sdata->vif.type = type;
1399         sdata->vif.p2p = false;
1400         sdata->wdev.iftype = type;
1401 
1402         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1403         sdata->control_port_no_encrypt = false;
1404         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1405         sdata->vif.bss_conf.idle = true;
1406 
1407         sdata->noack_map = 0;
1408 
1409         /* only monitor/p2p-device differ */
1410         if (sdata->dev) {
1411                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1412                 sdata->dev->type = ARPHRD_ETHER;
1413         }
1414 
1415         skb_queue_head_init(&sdata->skb_queue);
1416         INIT_WORK(&sdata->work, ieee80211_iface_work);
1417         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1418         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1419         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1420         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1421 
1422         switch (type) {
1423         case NL80211_IFTYPE_P2P_GO:
1424                 type = NL80211_IFTYPE_AP;
1425                 sdata->vif.type = type;
1426                 sdata->vif.p2p = true;
1427                 /* fall through */
1428         case NL80211_IFTYPE_AP:
1429                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1430                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1431                 INIT_WORK(&sdata->u.ap.request_smps_work,
1432                           ieee80211_request_smps_ap_work);
1433                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1434                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1435                 break;
1436         case NL80211_IFTYPE_P2P_CLIENT:
1437                 type = NL80211_IFTYPE_STATION;
1438                 sdata->vif.type = type;
1439                 sdata->vif.p2p = true;
1440                 /* fall through */
1441         case NL80211_IFTYPE_STATION:
1442                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1443                 ieee80211_sta_setup_sdata(sdata);
1444                 break;
1445         case NL80211_IFTYPE_OCB:
1446                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1447                 ieee80211_ocb_setup_sdata(sdata);
1448                 break;
1449         case NL80211_IFTYPE_ADHOC:
1450                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1451                 ieee80211_ibss_setup_sdata(sdata);
1452                 break;
1453         case NL80211_IFTYPE_MESH_POINT:
1454                 if (ieee80211_vif_is_mesh(&sdata->vif))
1455                         ieee80211_mesh_init_sdata(sdata);
1456                 break;
1457         case NL80211_IFTYPE_MONITOR:
1458                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1459                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1460                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1461                                       MONITOR_FLAG_OTHER_BSS;
1462                 break;
1463         case NL80211_IFTYPE_WDS:
1464                 sdata->vif.bss_conf.bssid = NULL;
1465                 break;
1466         case NL80211_IFTYPE_NAN:
1467                 idr_init(&sdata->u.nan.function_inst_ids);
1468                 spin_lock_init(&sdata->u.nan.func_lock);
1469                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1470                 break;
1471         case NL80211_IFTYPE_AP_VLAN:
1472         case NL80211_IFTYPE_P2P_DEVICE:
1473                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1474                 break;
1475         case NL80211_IFTYPE_UNSPECIFIED:
1476         case NUM_NL80211_IFTYPES:
1477                 WARN_ON(1);
1478                 break;
1479         }
1480 
1481         ieee80211_debugfs_add_netdev(sdata);
1482 }
1483 
1484 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1485                                            enum nl80211_iftype type)
1486 {
1487         struct ieee80211_local *local = sdata->local;
1488         int ret, err;
1489         enum nl80211_iftype internal_type = type;
1490         bool p2p = false;
1491 
1492         ASSERT_RTNL();
1493 
1494         if (!local->ops->change_interface)
1495                 return -EBUSY;
1496 
1497         switch (sdata->vif.type) {
1498         case NL80211_IFTYPE_AP:
1499         case NL80211_IFTYPE_STATION:
1500         case NL80211_IFTYPE_ADHOC:
1501         case NL80211_IFTYPE_OCB:
1502                 /*
1503                  * Could maybe also all others here?
1504                  * Just not sure how that interacts
1505                  * with the RX/config path e.g. for
1506                  * mesh.
1507                  */
1508                 break;
1509         default:
1510                 return -EBUSY;
1511         }
1512 
1513         switch (type) {
1514         case NL80211_IFTYPE_AP:
1515         case NL80211_IFTYPE_STATION:
1516         case NL80211_IFTYPE_ADHOC:
1517         case NL80211_IFTYPE_OCB:
1518                 /*
1519                  * Could probably support everything
1520                  * but WDS here (WDS do_open can fail
1521                  * under memory pressure, which this
1522                  * code isn't prepared to handle).
1523                  */
1524                 break;
1525         case NL80211_IFTYPE_P2P_CLIENT:
1526                 p2p = true;
1527                 internal_type = NL80211_IFTYPE_STATION;
1528                 break;
1529         case NL80211_IFTYPE_P2P_GO:
1530                 p2p = true;
1531                 internal_type = NL80211_IFTYPE_AP;
1532                 break;
1533         default:
1534                 return -EBUSY;
1535         }
1536 
1537         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1538         if (ret)
1539                 return ret;
1540 
1541         ieee80211_do_stop(sdata, false);
1542 
1543         ieee80211_teardown_sdata(sdata);
1544 
1545         ret = drv_change_interface(local, sdata, internal_type, p2p);
1546         if (ret)
1547                 type = ieee80211_vif_type_p2p(&sdata->vif);
1548 
1549         /*
1550          * Ignore return value here, there's not much we can do since
1551          * the driver changed the interface type internally already.
1552          * The warnings will hopefully make driver authors fix it :-)
1553          */
1554         ieee80211_check_queues(sdata, type);
1555 
1556         ieee80211_setup_sdata(sdata, type);
1557 
1558         err = ieee80211_do_open(&sdata->wdev, false);
1559         WARN(err, "type change: do_open returned %d", err);
1560 
1561         return ret;
1562 }
1563 
1564 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1565                              enum nl80211_iftype type)
1566 {
1567         int ret;
1568 
1569         ASSERT_RTNL();
1570 
1571         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1572                 return 0;
1573 
1574         if (ieee80211_sdata_running(sdata)) {
1575                 ret = ieee80211_runtime_change_iftype(sdata, type);
1576                 if (ret)
1577                         return ret;
1578         } else {
1579                 /* Purge and reset type-dependent state. */
1580                 ieee80211_teardown_sdata(sdata);
1581                 ieee80211_setup_sdata(sdata, type);
1582         }
1583 
1584         /* reset some values that shouldn't be kept across type changes */
1585         if (type == NL80211_IFTYPE_STATION)
1586                 sdata->u.mgd.use_4addr = false;
1587 
1588         return 0;
1589 }
1590 
1591 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1592                                        u8 *perm_addr, enum nl80211_iftype type)
1593 {
1594         struct ieee80211_sub_if_data *sdata;
1595         u64 mask, start, addr, val, inc;
1596         u8 *m;
1597         u8 tmp_addr[ETH_ALEN];
1598         int i;
1599 
1600         /* default ... something at least */
1601         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1602 
1603         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1604             local->hw.wiphy->n_addresses <= 1)
1605                 return;
1606 
1607         mutex_lock(&local->iflist_mtx);
1608 
1609         switch (type) {
1610         case NL80211_IFTYPE_MONITOR:
1611                 /* doesn't matter */
1612                 break;
1613         case NL80211_IFTYPE_WDS:
1614         case NL80211_IFTYPE_AP_VLAN:
1615                 /* match up with an AP interface */
1616                 list_for_each_entry(sdata, &local->interfaces, list) {
1617                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1618                                 continue;
1619                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1620                         break;
1621                 }
1622                 /* keep default if no AP interface present */
1623                 break;
1624         case NL80211_IFTYPE_P2P_CLIENT:
1625         case NL80211_IFTYPE_P2P_GO:
1626                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1627                         list_for_each_entry(sdata, &local->interfaces, list) {
1628                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1629                                         continue;
1630                                 if (!ieee80211_sdata_running(sdata))
1631                                         continue;
1632                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1633                                 goto out_unlock;
1634                         }
1635                 }
1636                 /* otherwise fall through */
1637         default:
1638                 /* assign a new address if possible -- try n_addresses first */
1639                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1640                         bool used = false;
1641 
1642                         list_for_each_entry(sdata, &local->interfaces, list) {
1643                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1644                                                      sdata->vif.addr)) {
1645                                         used = true;
1646                                         break;
1647                                 }
1648                         }
1649 
1650                         if (!used) {
1651                                 memcpy(perm_addr,
1652                                        local->hw.wiphy->addresses[i].addr,
1653                                        ETH_ALEN);
1654                                 break;
1655                         }
1656                 }
1657 
1658                 /* try mask if available */
1659                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1660                         break;
1661 
1662                 m = local->hw.wiphy->addr_mask;
1663                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1664                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1665                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1666 
1667                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1668                         /* not a contiguous mask ... not handled now! */
1669                         pr_info("not contiguous\n");
1670                         break;
1671                 }
1672 
1673                 /*
1674                  * Pick address of existing interface in case user changed
1675                  * MAC address manually, default to perm_addr.
1676                  */
1677                 m = local->hw.wiphy->perm_addr;
1678                 list_for_each_entry(sdata, &local->interfaces, list) {
1679                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1680                                 continue;
1681                         m = sdata->vif.addr;
1682                         break;
1683                 }
1684                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1685                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1686                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1687 
1688                 inc = 1ULL<<__ffs64(mask);
1689                 val = (start & mask);
1690                 addr = (start & ~mask) | (val & mask);
1691                 do {
1692                         bool used = false;
1693 
1694                         tmp_addr[5] = addr >> 0*8;
1695                         tmp_addr[4] = addr >> 1*8;
1696                         tmp_addr[3] = addr >> 2*8;
1697                         tmp_addr[2] = addr >> 3*8;
1698                         tmp_addr[1] = addr >> 4*8;
1699                         tmp_addr[0] = addr >> 5*8;
1700 
1701                         val += inc;
1702 
1703                         list_for_each_entry(sdata, &local->interfaces, list) {
1704                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1705                                         used = true;
1706                                         break;
1707                                 }
1708                         }
1709 
1710                         if (!used) {
1711                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1712                                 break;
1713                         }
1714                         addr = (start & ~mask) | (val & mask);
1715                 } while (addr != start);
1716 
1717                 break;
1718         }
1719 
1720  out_unlock:
1721         mutex_unlock(&local->iflist_mtx);
1722 }
1723 
1724 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1725                      unsigned char name_assign_type,
1726                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1727                      struct vif_params *params)
1728 {
1729         struct net_device *ndev = NULL;
1730         struct ieee80211_sub_if_data *sdata = NULL;
1731         struct txq_info *txqi;
1732         void (*if_setup)(struct net_device *dev);
1733         int ret, i;
1734         int txqs = 1;
1735 
1736         ASSERT_RTNL();
1737 
1738         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1739                 struct wireless_dev *wdev;
1740 
1741                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1742                                 GFP_KERNEL);
1743                 if (!sdata)
1744                         return -ENOMEM;
1745                 wdev = &sdata->wdev;
1746 
1747                 sdata->dev = NULL;
1748                 strlcpy(sdata->name, name, IFNAMSIZ);
1749                 ieee80211_assign_perm_addr(local, wdev->address, type);
1750                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1751         } else {
1752                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1753                                  sizeof(void *));
1754                 int txq_size = 0;
1755 
1756                 if (local->ops->wake_tx_queue &&
1757                     type != NL80211_IFTYPE_AP_VLAN &&
1758                     type != NL80211_IFTYPE_MONITOR)
1759                         txq_size += sizeof(struct txq_info) +
1760                                     local->hw.txq_data_size;
1761 
1762                 if (local->ops->wake_tx_queue)
1763                         if_setup = ieee80211_if_setup_no_queue;
1764                 else
1765                         if_setup = ieee80211_if_setup;
1766 
1767                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1768                         txqs = IEEE80211_NUM_ACS;
1769 
1770                 ndev = alloc_netdev_mqs(size + txq_size,
1771                                         name, name_assign_type,
1772                                         if_setup, txqs, 1);
1773                 if (!ndev)
1774                         return -ENOMEM;
1775                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1776 
1777                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1778                 if (!ndev->tstats) {
1779                         free_netdev(ndev);
1780                         return -ENOMEM;
1781                 }
1782 
1783                 ndev->needed_headroom = local->tx_headroom +
1784                                         4*6 /* four MAC addresses */
1785                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1786                                         + 6 /* mesh */
1787                                         + 8 /* rfc1042/bridge tunnel */
1788                                         - ETH_HLEN /* ethernet hard_header_len */
1789                                         + IEEE80211_ENCRYPT_HEADROOM;
1790                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1791 
1792                 ret = dev_alloc_name(ndev, ndev->name);
1793                 if (ret < 0) {
1794                         ieee80211_if_free(ndev);
1795                         free_netdev(ndev);
1796                         return ret;
1797                 }
1798 
1799                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1800                 if (params && is_valid_ether_addr(params->macaddr))
1801                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1802                 else
1803                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1804                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1805 
1806                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1807                 sdata = netdev_priv(ndev);
1808                 ndev->ieee80211_ptr = &sdata->wdev;
1809                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1810                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1811 
1812                 if (txq_size) {
1813                         txqi = netdev_priv(ndev) + size;
1814                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1815                 }
1816 
1817                 sdata->dev = ndev;
1818         }
1819 
1820         /* initialise type-independent data */
1821         sdata->wdev.wiphy = local->hw.wiphy;
1822         sdata->local = local;
1823 
1824         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1825                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1826 
1827         INIT_LIST_HEAD(&sdata->key_list);
1828 
1829         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1830                           ieee80211_dfs_cac_timer_work);
1831         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1832                           ieee80211_delayed_tailroom_dec);
1833 
1834         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1835                 struct ieee80211_supported_band *sband;
1836                 sband = local->hw.wiphy->bands[i];
1837                 sdata->rc_rateidx_mask[i] =
1838                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1839                 if (sband) {
1840                         __le16 cap;
1841                         u16 *vht_rate_mask;
1842 
1843                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1844                                sband->ht_cap.mcs.rx_mask,
1845                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1846 
1847                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1848                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1849                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1850                 } else {
1851                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1852                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1853                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1854                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1855                 }
1856         }
1857 
1858         ieee80211_set_default_queues(sdata);
1859 
1860         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1861         sdata->user_power_level = local->user_power_level;
1862 
1863         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1864 
1865         /* setup type-dependent data */
1866         ieee80211_setup_sdata(sdata, type);
1867 
1868         if (ndev) {
1869                 if (params) {
1870                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1871                         if (type == NL80211_IFTYPE_STATION)
1872                                 sdata->u.mgd.use_4addr = params->use_4addr;
1873                 }
1874 
1875                 ndev->features |= local->hw.netdev_features;
1876 
1877                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1878 
1879                 /* MTU range: 256 - 2304 */
1880                 ndev->min_mtu = 256;
1881                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1882 
1883                 ret = register_netdevice(ndev);
1884                 if (ret) {
1885                         free_netdev(ndev);
1886                         return ret;
1887                 }
1888         }
1889 
1890         mutex_lock(&local->iflist_mtx);
1891         list_add_tail_rcu(&sdata->list, &local->interfaces);
1892         mutex_unlock(&local->iflist_mtx);
1893 
1894         if (new_wdev)
1895                 *new_wdev = &sdata->wdev;
1896 
1897         return 0;
1898 }
1899 
1900 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1901 {
1902         ASSERT_RTNL();
1903 
1904         mutex_lock(&sdata->local->iflist_mtx);
1905         list_del_rcu(&sdata->list);
1906         mutex_unlock(&sdata->local->iflist_mtx);
1907 
1908         synchronize_rcu();
1909 
1910         if (sdata->dev) {
1911                 unregister_netdevice(sdata->dev);
1912         } else {
1913                 cfg80211_unregister_wdev(&sdata->wdev);
1914                 ieee80211_teardown_sdata(sdata);
1915                 kfree(sdata);
1916         }
1917 }
1918 
1919 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1920 {
1921         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1922                 return;
1923         ieee80211_do_stop(sdata, true);
1924 }
1925 
1926 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1927 {
1928         struct ieee80211_sub_if_data *sdata, *tmp;
1929         LIST_HEAD(unreg_list);
1930         LIST_HEAD(wdev_list);
1931 
1932         ASSERT_RTNL();
1933 
1934         /* Before destroying the interfaces, make sure they're all stopped so
1935          * that the hardware is stopped. Otherwise, the driver might still be
1936          * iterating the interfaces during the shutdown, e.g. from a worker
1937          * or from RX processing or similar, and if it does so (using atomic
1938          * iteration) while we're manipulating the list, the iteration will
1939          * crash.
1940          *
1941          * After this, the hardware should be stopped and the driver should
1942          * have stopped all of its activities, so that we can do RCU-unaware
1943          * manipulations of the interface list below.
1944          */
1945         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1946 
1947         WARN(local->open_count, "%s: open count remains %d\n",
1948              wiphy_name(local->hw.wiphy), local->open_count);
1949 
1950         mutex_lock(&local->iflist_mtx);
1951         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1952                 list_del(&sdata->list);
1953 
1954                 if (sdata->dev)
1955                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1956                 else
1957                         list_add(&sdata->list, &wdev_list);
1958         }
1959         mutex_unlock(&local->iflist_mtx);
1960         unregister_netdevice_many(&unreg_list);
1961 
1962         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1963                 list_del(&sdata->list);
1964                 cfg80211_unregister_wdev(&sdata->wdev);
1965                 kfree(sdata);
1966         }
1967 }
1968 
1969 static int netdev_notify(struct notifier_block *nb,
1970                          unsigned long state, void *ptr)
1971 {
1972         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1973         struct ieee80211_sub_if_data *sdata;
1974 
1975         if (state != NETDEV_CHANGENAME)
1976                 return NOTIFY_DONE;
1977 
1978         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1979                 return NOTIFY_DONE;
1980 
1981         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1982                 return NOTIFY_DONE;
1983 
1984         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1985         memcpy(sdata->name, dev->name, IFNAMSIZ);
1986         ieee80211_debugfs_rename_netdev(sdata);
1987 
1988         return NOTIFY_OK;
1989 }
1990 
1991 static struct notifier_block mac80211_netdev_notifier = {
1992         .notifier_call = netdev_notify,
1993 };
1994 
1995 int ieee80211_iface_init(void)
1996 {
1997         return register_netdevice_notifier(&mac80211_netdev_notifier);
1998 }
1999 
2000 void ieee80211_iface_exit(void)
2001 {
2002         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2003 }
2004 
2005 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2006 {
2007         if (sdata->vif.type == NL80211_IFTYPE_AP)
2008                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2009         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2010                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2011 }
2012 
2013 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2014 {
2015         if (sdata->vif.type == NL80211_IFTYPE_AP)
2016                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2017         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2018                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2019 }
2020 

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