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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         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
680                 /* Create STA entry for the WDS peer */
681                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
682                                      GFP_KERNEL);
683                 if (!sta) {
684                         res = -ENOMEM;
685                         goto err_del_interface;
686                 }
687 
688                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
689                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
690                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
691 
692                 res = sta_info_insert(sta);
693                 if (res) {
694                         /* STA has been freed */
695                         goto err_del_interface;
696                 }
697 
698                 rate_control_rate_init(sta);
699                 netif_carrier_on(dev);
700         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
701                 rcu_assign_pointer(local->p2p_sdata, sdata);
702         }
703 
704         /*
705          * set_multicast_list will be invoked by the networking core
706          * which will check whether any increments here were done in
707          * error and sync them down to the hardware as filter flags.
708          */
709         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
710                 atomic_inc(&local->iff_allmultis);
711 
712         if (coming_up)
713                 local->open_count++;
714 
715         if (hw_reconf_flags)
716                 ieee80211_hw_config(local, hw_reconf_flags);
717 
718         ieee80211_recalc_ps(local);
719 
720         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
721             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
722             local->ops->wake_tx_queue) {
723                 /* XXX: for AP_VLAN, actually track AP queues */
724                 netif_tx_start_all_queues(dev);
725         } else if (dev) {
726                 unsigned long flags;
727                 int n_acs = IEEE80211_NUM_ACS;
728                 int ac;
729 
730                 if (local->hw.queues < IEEE80211_NUM_ACS)
731                         n_acs = 1;
732 
733                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
734                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
735                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
736                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
737                         for (ac = 0; ac < n_acs; ac++) {
738                                 int ac_queue = sdata->vif.hw_queue[ac];
739 
740                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
741                                     skb_queue_empty(&local->pending[ac_queue]))
742                                         netif_start_subqueue(dev, ac);
743                         }
744                 }
745                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
746         }
747 
748         return 0;
749  err_del_interface:
750         drv_remove_interface(local, sdata);
751  err_stop:
752         if (!local->open_count)
753                 drv_stop(local);
754  err_del_bss:
755         sdata->bss = NULL;
756         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
757                 mutex_lock(&local->mtx);
758                 list_del(&sdata->u.vlan.list);
759                 mutex_unlock(&local->mtx);
760         }
761         /* might already be clear but that doesn't matter */
762         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
763         return res;
764 }
765 
766 static int ieee80211_open(struct net_device *dev)
767 {
768         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
769         int err;
770 
771         /* fail early if user set an invalid address */
772         if (!is_valid_ether_addr(dev->dev_addr))
773                 return -EADDRNOTAVAIL;
774 
775         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
776         if (err)
777                 return err;
778 
779         return ieee80211_do_open(&sdata->wdev, true);
780 }
781 
782 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
783                               bool going_down)
784 {
785         struct ieee80211_local *local = sdata->local;
786         struct fq *fq = &local->fq;
787         unsigned long flags;
788         struct sk_buff *skb, *tmp;
789         u32 hw_reconf_flags = 0;
790         int i, flushed;
791         struct ps_data *ps;
792         struct cfg80211_chan_def chandef;
793         bool cancel_scan;
794         struct cfg80211_nan_func *func;
795 
796         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
797 
798         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
799         if (cancel_scan)
800                 ieee80211_scan_cancel(local);
801 
802         /*
803          * Stop TX on this interface first.
804          */
805         if (sdata->dev)
806                 netif_tx_stop_all_queues(sdata->dev);
807 
808         ieee80211_roc_purge(local, sdata);
809 
810         switch (sdata->vif.type) {
811         case NL80211_IFTYPE_STATION:
812                 ieee80211_mgd_stop(sdata);
813                 break;
814         case NL80211_IFTYPE_ADHOC:
815                 ieee80211_ibss_stop(sdata);
816                 break;
817         case NL80211_IFTYPE_AP:
818                 cancel_work_sync(&sdata->u.ap.request_smps_work);
819                 break;
820         default:
821                 break;
822         }
823 
824         /*
825          * Remove all stations associated with this interface.
826          *
827          * This must be done before calling ops->remove_interface()
828          * because otherwise we can later invoke ops->sta_notify()
829          * whenever the STAs are removed, and that invalidates driver
830          * assumptions about always getting a vif pointer that is valid
831          * (because if we remove a STA after ops->remove_interface()
832          * the driver will have removed the vif info already!)
833          *
834          * In WDS mode a station must exist here and be flushed, for
835          * AP_VLANs stations may exist since there's nothing else that
836          * would have removed them, but in other modes there shouldn't
837          * be any stations.
838          */
839         flushed = sta_info_flush(sdata);
840         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
841                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
842                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
843 
844         /* don't count this interface for allmulti while it is down */
845         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
846                 atomic_dec(&local->iff_allmultis);
847 
848         if (sdata->vif.type == NL80211_IFTYPE_AP) {
849                 local->fif_pspoll--;
850                 local->fif_probe_req--;
851         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
852                 local->fif_probe_req--;
853         }
854 
855         if (sdata->dev) {
856                 netif_addr_lock_bh(sdata->dev);
857                 spin_lock_bh(&local->filter_lock);
858                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
859                                  sdata->dev->addr_len);
860                 spin_unlock_bh(&local->filter_lock);
861                 netif_addr_unlock_bh(sdata->dev);
862         }
863 
864         del_timer_sync(&local->dynamic_ps_timer);
865         cancel_work_sync(&local->dynamic_ps_enable_work);
866 
867         cancel_work_sync(&sdata->recalc_smps);
868         sdata_lock(sdata);
869         mutex_lock(&local->mtx);
870         sdata->vif.csa_active = false;
871         if (sdata->vif.type == NL80211_IFTYPE_STATION)
872                 sdata->u.mgd.csa_waiting_bcn = false;
873         if (sdata->csa_block_tx) {
874                 ieee80211_wake_vif_queues(local, sdata,
875                                           IEEE80211_QUEUE_STOP_REASON_CSA);
876                 sdata->csa_block_tx = false;
877         }
878         mutex_unlock(&local->mtx);
879         sdata_unlock(sdata);
880 
881         cancel_work_sync(&sdata->csa_finalize_work);
882 
883         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
884 
885         if (sdata->wdev.cac_started) {
886                 chandef = sdata->vif.bss_conf.chandef;
887                 WARN_ON(local->suspended);
888                 mutex_lock(&local->mtx);
889                 ieee80211_vif_release_channel(sdata);
890                 mutex_unlock(&local->mtx);
891                 cfg80211_cac_event(sdata->dev, &chandef,
892                                    NL80211_RADAR_CAC_ABORTED,
893                                    GFP_KERNEL);
894         }
895 
896         /* APs need special treatment */
897         if (sdata->vif.type == NL80211_IFTYPE_AP) {
898                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
899 
900                 /* down all dependent devices, that is VLANs */
901                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
902                                          u.vlan.list)
903                         dev_close(vlan->dev);
904                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
905         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
906                 /* remove all packets in parent bc_buf pointing to this dev */
907                 ps = &sdata->bss->ps;
908 
909                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
910                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
911                         if (skb->dev == sdata->dev) {
912                                 __skb_unlink(skb, &ps->bc_buf);
913                                 local->total_ps_buffered--;
914                                 ieee80211_free_txskb(&local->hw, skb);
915                         }
916                 }
917                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
918         }
919 
920         if (going_down)
921                 local->open_count--;
922 
923         switch (sdata->vif.type) {
924         case NL80211_IFTYPE_AP_VLAN:
925                 mutex_lock(&local->mtx);
926                 list_del(&sdata->u.vlan.list);
927                 mutex_unlock(&local->mtx);
928                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
929                 /* see comment in the default case below */
930                 ieee80211_free_keys(sdata, true);
931                 /* no need to tell driver */
932                 break;
933         case NL80211_IFTYPE_MONITOR:
934                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
935                         local->cooked_mntrs--;
936                         break;
937                 }
938 
939                 local->monitors--;
940                 if (local->monitors == 0) {
941                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
942                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
943                 }
944 
945                 ieee80211_adjust_monitor_flags(sdata, -1);
946                 break;
947         case NL80211_IFTYPE_NAN:
948                 /* clean all the functions */
949                 spin_lock_bh(&sdata->u.nan.func_lock);
950 
951                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
952                         idr_remove(&sdata->u.nan.function_inst_ids, i);
953                         cfg80211_free_nan_func(func);
954                 }
955                 idr_destroy(&sdata->u.nan.function_inst_ids);
956 
957                 spin_unlock_bh(&sdata->u.nan.func_lock);
958                 break;
959         case NL80211_IFTYPE_P2P_DEVICE:
960                 /* relies on synchronize_rcu() below */
961                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
962                 /* fall through */
963         default:
964                 cancel_work_sync(&sdata->work);
965                 /*
966                  * When we get here, the interface is marked down.
967                  * Free the remaining keys, if there are any
968                  * (which can happen in AP mode if userspace sets
969                  * keys before the interface is operating, and maybe
970                  * also in WDS mode)
971                  *
972                  * Force the key freeing to always synchronize_net()
973                  * to wait for the RX path in case it is using this
974                  * interface enqueuing frames at this very time on
975                  * another CPU.
976                  */
977                 ieee80211_free_keys(sdata, true);
978                 skb_queue_purge(&sdata->skb_queue);
979         }
980 
981         sdata->bss = NULL;
982 
983         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
984         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
985                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
986                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
987                         if (info->control.vif == &sdata->vif) {
988                                 __skb_unlink(skb, &local->pending[i]);
989                                 ieee80211_free_txskb(&local->hw, skb);
990                         }
991                 }
992         }
993         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
994 
995         if (sdata->vif.txq) {
996                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
997 
998                 spin_lock_bh(&fq->lock);
999                 ieee80211_txq_purge(local, txqi);
1000                 spin_unlock_bh(&fq->lock);
1001         }
1002 
1003         if (local->open_count == 0)
1004                 ieee80211_clear_tx_pending(local);
1005 
1006         /*
1007          * If the interface goes down while suspended, presumably because
1008          * the device was unplugged and that happens before our resume,
1009          * then the driver is already unconfigured and the remainder of
1010          * this function isn't needed.
1011          * XXX: what about WoWLAN? If the device has software state, e.g.
1012          *      memory allocated, it might expect teardown commands from
1013          *      mac80211 here?
1014          */
1015         if (local->suspended) {
1016                 WARN_ON(local->wowlan);
1017                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1018                 return;
1019         }
1020 
1021         switch (sdata->vif.type) {
1022         case NL80211_IFTYPE_AP_VLAN:
1023                 break;
1024         case NL80211_IFTYPE_MONITOR:
1025                 if (local->monitors == 0)
1026                         ieee80211_del_virtual_monitor(local);
1027 
1028                 mutex_lock(&local->mtx);
1029                 ieee80211_recalc_idle(local);
1030                 mutex_unlock(&local->mtx);
1031 
1032                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1033                         break;
1034 
1035                 /* fall through */
1036         default:
1037                 if (going_down)
1038                         drv_remove_interface(local, sdata);
1039         }
1040 
1041         ieee80211_recalc_ps(local);
1042 
1043         if (cancel_scan)
1044                 flush_delayed_work(&local->scan_work);
1045 
1046         if (local->open_count == 0) {
1047                 ieee80211_stop_device(local);
1048 
1049                 /* no reconfiguring after stop! */
1050                 return;
1051         }
1052 
1053         /* do after stop to avoid reconfiguring when we stop anyway */
1054         ieee80211_configure_filter(local);
1055         ieee80211_hw_config(local, hw_reconf_flags);
1056 
1057         if (local->monitors == local->open_count)
1058                 ieee80211_add_virtual_monitor(local);
1059 }
1060 
1061 static int ieee80211_stop(struct net_device *dev)
1062 {
1063         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1064 
1065         ieee80211_do_stop(sdata, true);
1066 
1067         return 0;
1068 }
1069 
1070 static void ieee80211_set_multicast_list(struct net_device *dev)
1071 {
1072         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1073         struct ieee80211_local *local = sdata->local;
1074         int allmulti, sdata_allmulti;
1075 
1076         allmulti = !!(dev->flags & IFF_ALLMULTI);
1077         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1078 
1079         if (allmulti != sdata_allmulti) {
1080                 if (dev->flags & IFF_ALLMULTI)
1081                         atomic_inc(&local->iff_allmultis);
1082                 else
1083                         atomic_dec(&local->iff_allmultis);
1084                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1085         }
1086 
1087         spin_lock_bh(&local->filter_lock);
1088         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1089         spin_unlock_bh(&local->filter_lock);
1090         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1091 }
1092 
1093 /*
1094  * Called when the netdev is removed or, by the code below, before
1095  * the interface type changes.
1096  */
1097 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1098 {
1099         int i;
1100 
1101         /* free extra data */
1102         ieee80211_free_keys(sdata, false);
1103 
1104         ieee80211_debugfs_remove_netdev(sdata);
1105 
1106         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1107                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1108         sdata->fragment_next = 0;
1109 
1110         if (ieee80211_vif_is_mesh(&sdata->vif))
1111                 ieee80211_mesh_teardown_sdata(sdata);
1112 }
1113 
1114 static void ieee80211_uninit(struct net_device *dev)
1115 {
1116         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1117 }
1118 
1119 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1120                                          struct sk_buff *skb,
1121                                          void *accel_priv,
1122                                          select_queue_fallback_t fallback)
1123 {
1124         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1125 }
1126 
1127 static struct rtnl_link_stats64 *
1128 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1129 {
1130         int i;
1131 
1132         for_each_possible_cpu(i) {
1133                 const struct pcpu_sw_netstats *tstats;
1134                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1135                 unsigned int start;
1136 
1137                 tstats = per_cpu_ptr(dev->tstats, i);
1138 
1139                 do {
1140                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1141                         rx_packets = tstats->rx_packets;
1142                         tx_packets = tstats->tx_packets;
1143                         rx_bytes = tstats->rx_bytes;
1144                         tx_bytes = tstats->tx_bytes;
1145                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1146 
1147                 stats->rx_packets += rx_packets;
1148                 stats->tx_packets += tx_packets;
1149                 stats->rx_bytes   += rx_bytes;
1150                 stats->tx_bytes   += tx_bytes;
1151         }
1152 
1153         return stats;
1154 }
1155 
1156 static const struct net_device_ops ieee80211_dataif_ops = {
1157         .ndo_open               = ieee80211_open,
1158         .ndo_stop               = ieee80211_stop,
1159         .ndo_uninit             = ieee80211_uninit,
1160         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1161         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1162         .ndo_set_mac_address    = ieee80211_change_mac,
1163         .ndo_select_queue       = ieee80211_netdev_select_queue,
1164         .ndo_get_stats64        = ieee80211_get_stats64,
1165 };
1166 
1167 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1168                                           struct sk_buff *skb,
1169                                           void *accel_priv,
1170                                           select_queue_fallback_t fallback)
1171 {
1172         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1173         struct ieee80211_local *local = sdata->local;
1174         struct ieee80211_hdr *hdr;
1175         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1176 
1177         if (local->hw.queues < IEEE80211_NUM_ACS)
1178                 return 0;
1179 
1180         if (skb->len < 4 ||
1181             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1182                 return 0; /* doesn't matter, frame will be dropped */
1183 
1184         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1185 
1186         return ieee80211_select_queue_80211(sdata, skb, hdr);
1187 }
1188 
1189 static const struct net_device_ops ieee80211_monitorif_ops = {
1190         .ndo_open               = ieee80211_open,
1191         .ndo_stop               = ieee80211_stop,
1192         .ndo_uninit             = ieee80211_uninit,
1193         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1194         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1195         .ndo_set_mac_address    = ieee80211_change_mac,
1196         .ndo_select_queue       = ieee80211_monitor_select_queue,
1197         .ndo_get_stats64        = ieee80211_get_stats64,
1198 };
1199 
1200 static void ieee80211_if_free(struct net_device *dev)
1201 {
1202         free_percpu(dev->tstats);
1203         free_netdev(dev);
1204 }
1205 
1206 static void ieee80211_if_setup(struct net_device *dev)
1207 {
1208         ether_setup(dev);
1209         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1210         dev->netdev_ops = &ieee80211_dataif_ops;
1211         dev->destructor = ieee80211_if_free;
1212 }
1213 
1214 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1215 {
1216         ieee80211_if_setup(dev);
1217         dev->priv_flags |= IFF_NO_QUEUE;
1218 }
1219 
1220 static void ieee80211_iface_work(struct work_struct *work)
1221 {
1222         struct ieee80211_sub_if_data *sdata =
1223                 container_of(work, struct ieee80211_sub_if_data, work);
1224         struct ieee80211_local *local = sdata->local;
1225         struct sk_buff *skb;
1226         struct sta_info *sta;
1227         struct ieee80211_ra_tid *ra_tid;
1228         struct ieee80211_rx_agg *rx_agg;
1229 
1230         if (!ieee80211_sdata_running(sdata))
1231                 return;
1232 
1233         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1234                 return;
1235 
1236         if (!ieee80211_can_run_worker(local))
1237                 return;
1238 
1239         /* first process frames */
1240         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1241                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1242 
1243                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1244                         ra_tid = (void *)&skb->cb;
1245                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1246                                                  ra_tid->tid);
1247                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1248                         ra_tid = (void *)&skb->cb;
1249                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1250                                                 ra_tid->tid);
1251                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1252                         rx_agg = (void *)&skb->cb;
1253                         mutex_lock(&local->sta_mtx);
1254                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1255                         if (sta)
1256                                 __ieee80211_start_rx_ba_session(sta,
1257                                                 0, 0, 0, 1, rx_agg->tid,
1258                                                 IEEE80211_MAX_AMPDU_BUF,
1259                                                 false, true);
1260                         mutex_unlock(&local->sta_mtx);
1261                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1262                         rx_agg = (void *)&skb->cb;
1263                         mutex_lock(&local->sta_mtx);
1264                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1265                         if (sta)
1266                                 __ieee80211_stop_rx_ba_session(sta,
1267                                                         rx_agg->tid,
1268                                                         WLAN_BACK_RECIPIENT, 0,
1269                                                         false);
1270                         mutex_unlock(&local->sta_mtx);
1271                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1272                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1273                         int len = skb->len;
1274 
1275                         mutex_lock(&local->sta_mtx);
1276                         sta = sta_info_get_bss(sdata, mgmt->sa);
1277                         if (sta) {
1278                                 switch (mgmt->u.action.u.addba_req.action_code) {
1279                                 case WLAN_ACTION_ADDBA_REQ:
1280                                         ieee80211_process_addba_request(
1281                                                         local, sta, mgmt, len);
1282                                         break;
1283                                 case WLAN_ACTION_ADDBA_RESP:
1284                                         ieee80211_process_addba_resp(local, sta,
1285                                                                      mgmt, len);
1286                                         break;
1287                                 case WLAN_ACTION_DELBA:
1288                                         ieee80211_process_delba(sdata, sta,
1289                                                                 mgmt, len);
1290                                         break;
1291                                 default:
1292                                         WARN_ON(1);
1293                                         break;
1294                                 }
1295                         }
1296                         mutex_unlock(&local->sta_mtx);
1297                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1298                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1299                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1300                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1301                                 struct ieee80211_rx_status *status;
1302                                 enum nl80211_band band;
1303                                 u8 opmode;
1304 
1305                                 status = IEEE80211_SKB_RXCB(skb);
1306                                 band = status->band;
1307                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1308 
1309                                 mutex_lock(&local->sta_mtx);
1310                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1311 
1312                                 if (sta)
1313                                         ieee80211_vht_handle_opmode(sdata, sta,
1314                                                                     opmode,
1315                                                                     band);
1316 
1317                                 mutex_unlock(&local->sta_mtx);
1318                                 break;
1319                         }
1320                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1321                                 ieee80211_process_mu_groups(sdata, mgmt);
1322                                 break;
1323                         default:
1324                                 WARN_ON(1);
1325                                 break;
1326                         }
1327                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1328                         struct ieee80211_hdr *hdr = (void *)mgmt;
1329                         /*
1330                          * So the frame isn't mgmt, but frame_control
1331                          * is at the right place anyway, of course, so
1332                          * the if statement is correct.
1333                          *
1334                          * Warn if we have other data frame types here,
1335                          * they must not get here.
1336                          */
1337                         WARN_ON(hdr->frame_control &
1338                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1339                         WARN_ON(!(hdr->seq_ctrl &
1340                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1341                         /*
1342                          * This was a fragment of a frame, received while
1343                          * a block-ack session was active. That cannot be
1344                          * right, so terminate the session.
1345                          */
1346                         mutex_lock(&local->sta_mtx);
1347                         sta = sta_info_get_bss(sdata, mgmt->sa);
1348                         if (sta) {
1349                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1350                                                 IEEE80211_QOS_CTL_TID_MASK;
1351 
1352                                 __ieee80211_stop_rx_ba_session(
1353                                         sta, tid, WLAN_BACK_RECIPIENT,
1354                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1355                                         true);
1356                         }
1357                         mutex_unlock(&local->sta_mtx);
1358                 } else switch (sdata->vif.type) {
1359                 case NL80211_IFTYPE_STATION:
1360                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1361                         break;
1362                 case NL80211_IFTYPE_ADHOC:
1363                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1364                         break;
1365                 case NL80211_IFTYPE_MESH_POINT:
1366                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1367                                 break;
1368                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1369                         break;
1370                 default:
1371                         WARN(1, "frame for unexpected interface type");
1372                         break;
1373                 }
1374 
1375                 kfree_skb(skb);
1376         }
1377 
1378         /* then other type-dependent work */
1379         switch (sdata->vif.type) {
1380         case NL80211_IFTYPE_STATION:
1381                 ieee80211_sta_work(sdata);
1382                 break;
1383         case NL80211_IFTYPE_ADHOC:
1384                 ieee80211_ibss_work(sdata);
1385                 break;
1386         case NL80211_IFTYPE_MESH_POINT:
1387                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1388                         break;
1389                 ieee80211_mesh_work(sdata);
1390                 break;
1391         case NL80211_IFTYPE_OCB:
1392                 ieee80211_ocb_work(sdata);
1393                 break;
1394         default:
1395                 break;
1396         }
1397 }
1398 
1399 static void ieee80211_recalc_smps_work(struct work_struct *work)
1400 {
1401         struct ieee80211_sub_if_data *sdata =
1402                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1403 
1404         ieee80211_recalc_smps(sdata);
1405 }
1406 
1407 /*
1408  * Helper function to initialise an interface to a specific type.
1409  */
1410 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1411                                   enum nl80211_iftype type)
1412 {
1413         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1414                                                     0xff, 0xff, 0xff};
1415 
1416         /* clear type-dependent union */
1417         memset(&sdata->u, 0, sizeof(sdata->u));
1418 
1419         /* and set some type-dependent values */
1420         sdata->vif.type = type;
1421         sdata->vif.p2p = false;
1422         sdata->wdev.iftype = type;
1423 
1424         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1425         sdata->control_port_no_encrypt = false;
1426         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1427         sdata->vif.bss_conf.idle = true;
1428 
1429         sdata->noack_map = 0;
1430 
1431         /* only monitor/p2p-device differ */
1432         if (sdata->dev) {
1433                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1434                 sdata->dev->type = ARPHRD_ETHER;
1435         }
1436 
1437         skb_queue_head_init(&sdata->skb_queue);
1438         INIT_WORK(&sdata->work, ieee80211_iface_work);
1439         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1440         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1441         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1442         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1443 
1444         switch (type) {
1445         case NL80211_IFTYPE_P2P_GO:
1446                 type = NL80211_IFTYPE_AP;
1447                 sdata->vif.type = type;
1448                 sdata->vif.p2p = true;
1449                 /* fall through */
1450         case NL80211_IFTYPE_AP:
1451                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1452                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1453                 INIT_WORK(&sdata->u.ap.request_smps_work,
1454                           ieee80211_request_smps_ap_work);
1455                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1456                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1457                 break;
1458         case NL80211_IFTYPE_P2P_CLIENT:
1459                 type = NL80211_IFTYPE_STATION;
1460                 sdata->vif.type = type;
1461                 sdata->vif.p2p = true;
1462                 /* fall through */
1463         case NL80211_IFTYPE_STATION:
1464                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1465                 ieee80211_sta_setup_sdata(sdata);
1466                 break;
1467         case NL80211_IFTYPE_OCB:
1468                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1469                 ieee80211_ocb_setup_sdata(sdata);
1470                 break;
1471         case NL80211_IFTYPE_ADHOC:
1472                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1473                 ieee80211_ibss_setup_sdata(sdata);
1474                 break;
1475         case NL80211_IFTYPE_MESH_POINT:
1476                 if (ieee80211_vif_is_mesh(&sdata->vif))
1477                         ieee80211_mesh_init_sdata(sdata);
1478                 break;
1479         case NL80211_IFTYPE_MONITOR:
1480                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1481                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1482                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1483                                       MONITOR_FLAG_OTHER_BSS;
1484                 break;
1485         case NL80211_IFTYPE_WDS:
1486                 sdata->vif.bss_conf.bssid = NULL;
1487                 break;
1488         case NL80211_IFTYPE_NAN:
1489                 idr_init(&sdata->u.nan.function_inst_ids);
1490                 spin_lock_init(&sdata->u.nan.func_lock);
1491                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1492                 break;
1493         case NL80211_IFTYPE_AP_VLAN:
1494         case NL80211_IFTYPE_P2P_DEVICE:
1495                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1496                 break;
1497         case NL80211_IFTYPE_UNSPECIFIED:
1498         case NUM_NL80211_IFTYPES:
1499                 BUG();
1500                 break;
1501         }
1502 
1503         ieee80211_debugfs_add_netdev(sdata);
1504 }
1505 
1506 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1507                                            enum nl80211_iftype type)
1508 {
1509         struct ieee80211_local *local = sdata->local;
1510         int ret, err;
1511         enum nl80211_iftype internal_type = type;
1512         bool p2p = false;
1513 
1514         ASSERT_RTNL();
1515 
1516         if (!local->ops->change_interface)
1517                 return -EBUSY;
1518 
1519         switch (sdata->vif.type) {
1520         case NL80211_IFTYPE_AP:
1521         case NL80211_IFTYPE_STATION:
1522         case NL80211_IFTYPE_ADHOC:
1523         case NL80211_IFTYPE_OCB:
1524                 /*
1525                  * Could maybe also all others here?
1526                  * Just not sure how that interacts
1527                  * with the RX/config path e.g. for
1528                  * mesh.
1529                  */
1530                 break;
1531         default:
1532                 return -EBUSY;
1533         }
1534 
1535         switch (type) {
1536         case NL80211_IFTYPE_AP:
1537         case NL80211_IFTYPE_STATION:
1538         case NL80211_IFTYPE_ADHOC:
1539         case NL80211_IFTYPE_OCB:
1540                 /*
1541                  * Could probably support everything
1542                  * but WDS here (WDS do_open can fail
1543                  * under memory pressure, which this
1544                  * code isn't prepared to handle).
1545                  */
1546                 break;
1547         case NL80211_IFTYPE_P2P_CLIENT:
1548                 p2p = true;
1549                 internal_type = NL80211_IFTYPE_STATION;
1550                 break;
1551         case NL80211_IFTYPE_P2P_GO:
1552                 p2p = true;
1553                 internal_type = NL80211_IFTYPE_AP;
1554                 break;
1555         default:
1556                 return -EBUSY;
1557         }
1558 
1559         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1560         if (ret)
1561                 return ret;
1562 
1563         ieee80211_do_stop(sdata, false);
1564 
1565         ieee80211_teardown_sdata(sdata);
1566 
1567         ret = drv_change_interface(local, sdata, internal_type, p2p);
1568         if (ret)
1569                 type = ieee80211_vif_type_p2p(&sdata->vif);
1570 
1571         /*
1572          * Ignore return value here, there's not much we can do since
1573          * the driver changed the interface type internally already.
1574          * The warnings will hopefully make driver authors fix it :-)
1575          */
1576         ieee80211_check_queues(sdata, type);
1577 
1578         ieee80211_setup_sdata(sdata, type);
1579 
1580         err = ieee80211_do_open(&sdata->wdev, false);
1581         WARN(err, "type change: do_open returned %d", err);
1582 
1583         return ret;
1584 }
1585 
1586 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1587                              enum nl80211_iftype type)
1588 {
1589         int ret;
1590 
1591         ASSERT_RTNL();
1592 
1593         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1594                 return 0;
1595 
1596         if (ieee80211_sdata_running(sdata)) {
1597                 ret = ieee80211_runtime_change_iftype(sdata, type);
1598                 if (ret)
1599                         return ret;
1600         } else {
1601                 /* Purge and reset type-dependent state. */
1602                 ieee80211_teardown_sdata(sdata);
1603                 ieee80211_setup_sdata(sdata, type);
1604         }
1605 
1606         /* reset some values that shouldn't be kept across type changes */
1607         if (type == NL80211_IFTYPE_STATION)
1608                 sdata->u.mgd.use_4addr = false;
1609 
1610         return 0;
1611 }
1612 
1613 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1614                                        u8 *perm_addr, enum nl80211_iftype type)
1615 {
1616         struct ieee80211_sub_if_data *sdata;
1617         u64 mask, start, addr, val, inc;
1618         u8 *m;
1619         u8 tmp_addr[ETH_ALEN];
1620         int i;
1621 
1622         /* default ... something at least */
1623         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1624 
1625         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1626             local->hw.wiphy->n_addresses <= 1)
1627                 return;
1628 
1629         mutex_lock(&local->iflist_mtx);
1630 
1631         switch (type) {
1632         case NL80211_IFTYPE_MONITOR:
1633                 /* doesn't matter */
1634                 break;
1635         case NL80211_IFTYPE_WDS:
1636         case NL80211_IFTYPE_AP_VLAN:
1637                 /* match up with an AP interface */
1638                 list_for_each_entry(sdata, &local->interfaces, list) {
1639                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1640                                 continue;
1641                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1642                         break;
1643                 }
1644                 /* keep default if no AP interface present */
1645                 break;
1646         case NL80211_IFTYPE_P2P_CLIENT:
1647         case NL80211_IFTYPE_P2P_GO:
1648                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1649                         list_for_each_entry(sdata, &local->interfaces, list) {
1650                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1651                                         continue;
1652                                 if (!ieee80211_sdata_running(sdata))
1653                                         continue;
1654                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1655                                 goto out_unlock;
1656                         }
1657                 }
1658                 /* otherwise fall through */
1659         default:
1660                 /* assign a new address if possible -- try n_addresses first */
1661                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1662                         bool used = false;
1663 
1664                         list_for_each_entry(sdata, &local->interfaces, list) {
1665                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1666                                                      sdata->vif.addr)) {
1667                                         used = true;
1668                                         break;
1669                                 }
1670                         }
1671 
1672                         if (!used) {
1673                                 memcpy(perm_addr,
1674                                        local->hw.wiphy->addresses[i].addr,
1675                                        ETH_ALEN);
1676                                 break;
1677                         }
1678                 }
1679 
1680                 /* try mask if available */
1681                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1682                         break;
1683 
1684                 m = local->hw.wiphy->addr_mask;
1685                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1686                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1687                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1688 
1689                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1690                         /* not a contiguous mask ... not handled now! */
1691                         pr_info("not contiguous\n");
1692                         break;
1693                 }
1694 
1695                 /*
1696                  * Pick address of existing interface in case user changed
1697                  * MAC address manually, default to perm_addr.
1698                  */
1699                 m = local->hw.wiphy->perm_addr;
1700                 list_for_each_entry(sdata, &local->interfaces, list) {
1701                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1702                                 continue;
1703                         m = sdata->vif.addr;
1704                         break;
1705                 }
1706                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1707                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1708                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1709 
1710                 inc = 1ULL<<__ffs64(mask);
1711                 val = (start & mask);
1712                 addr = (start & ~mask) | (val & mask);
1713                 do {
1714                         bool used = false;
1715 
1716                         tmp_addr[5] = addr >> 0*8;
1717                         tmp_addr[4] = addr >> 1*8;
1718                         tmp_addr[3] = addr >> 2*8;
1719                         tmp_addr[2] = addr >> 3*8;
1720                         tmp_addr[1] = addr >> 4*8;
1721                         tmp_addr[0] = addr >> 5*8;
1722 
1723                         val += inc;
1724 
1725                         list_for_each_entry(sdata, &local->interfaces, list) {
1726                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1727                                         used = true;
1728                                         break;
1729                                 }
1730                         }
1731 
1732                         if (!used) {
1733                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1734                                 break;
1735                         }
1736                         addr = (start & ~mask) | (val & mask);
1737                 } while (addr != start);
1738 
1739                 break;
1740         }
1741 
1742  out_unlock:
1743         mutex_unlock(&local->iflist_mtx);
1744 }
1745 
1746 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1747                      unsigned char name_assign_type,
1748                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1749                      struct vif_params *params)
1750 {
1751         struct net_device *ndev = NULL;
1752         struct ieee80211_sub_if_data *sdata = NULL;
1753         struct txq_info *txqi;
1754         void (*if_setup)(struct net_device *dev);
1755         int ret, i;
1756         int txqs = 1;
1757 
1758         ASSERT_RTNL();
1759 
1760         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1761                 struct wireless_dev *wdev;
1762 
1763                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1764                                 GFP_KERNEL);
1765                 if (!sdata)
1766                         return -ENOMEM;
1767                 wdev = &sdata->wdev;
1768 
1769                 sdata->dev = NULL;
1770                 strlcpy(sdata->name, name, IFNAMSIZ);
1771                 ieee80211_assign_perm_addr(local, wdev->address, type);
1772                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1773         } else {
1774                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1775                                  sizeof(void *));
1776                 int txq_size = 0;
1777 
1778                 if (local->ops->wake_tx_queue)
1779                         txq_size += sizeof(struct txq_info) +
1780                                     local->hw.txq_data_size;
1781 
1782                 if (local->ops->wake_tx_queue)
1783                         if_setup = ieee80211_if_setup_no_queue;
1784                 else
1785                         if_setup = ieee80211_if_setup;
1786 
1787                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1788                         txqs = IEEE80211_NUM_ACS;
1789 
1790                 ndev = alloc_netdev_mqs(size + txq_size,
1791                                         name, name_assign_type,
1792                                         if_setup, txqs, 1);
1793                 if (!ndev)
1794                         return -ENOMEM;
1795                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1796 
1797                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1798                 if (!ndev->tstats) {
1799                         free_netdev(ndev);
1800                         return -ENOMEM;
1801                 }
1802 
1803                 ndev->needed_headroom = local->tx_headroom +
1804                                         4*6 /* four MAC addresses */
1805                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1806                                         + 6 /* mesh */
1807                                         + 8 /* rfc1042/bridge tunnel */
1808                                         - ETH_HLEN /* ethernet hard_header_len */
1809                                         + IEEE80211_ENCRYPT_HEADROOM;
1810                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1811 
1812                 ret = dev_alloc_name(ndev, ndev->name);
1813                 if (ret < 0) {
1814                         ieee80211_if_free(ndev);
1815                         return ret;
1816                 }
1817 
1818                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1819                 if (params && is_valid_ether_addr(params->macaddr))
1820                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1821                 else
1822                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1823                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1824 
1825                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1826                 sdata = netdev_priv(ndev);
1827                 ndev->ieee80211_ptr = &sdata->wdev;
1828                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1829                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1830 
1831                 if (txq_size) {
1832                         txqi = netdev_priv(ndev) + size;
1833                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1834                 }
1835 
1836                 sdata->dev = ndev;
1837         }
1838 
1839         /* initialise type-independent data */
1840         sdata->wdev.wiphy = local->hw.wiphy;
1841         sdata->local = local;
1842 
1843         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1844                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1845 
1846         INIT_LIST_HEAD(&sdata->key_list);
1847 
1848         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1849                           ieee80211_dfs_cac_timer_work);
1850         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1851                           ieee80211_delayed_tailroom_dec);
1852 
1853         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1854                 struct ieee80211_supported_band *sband;
1855                 sband = local->hw.wiphy->bands[i];
1856                 sdata->rc_rateidx_mask[i] =
1857                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1858                 if (sband) {
1859                         __le16 cap;
1860                         u16 *vht_rate_mask;
1861 
1862                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1863                                sband->ht_cap.mcs.rx_mask,
1864                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1865 
1866                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1867                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1868                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1869                 } else {
1870                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1871                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1872                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1873                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1874                 }
1875         }
1876 
1877         ieee80211_set_default_queues(sdata);
1878 
1879         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1880         sdata->user_power_level = local->user_power_level;
1881 
1882         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1883 
1884         /* setup type-dependent data */
1885         ieee80211_setup_sdata(sdata, type);
1886 
1887         if (ndev) {
1888                 if (params) {
1889                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1890                         if (type == NL80211_IFTYPE_STATION)
1891                                 sdata->u.mgd.use_4addr = params->use_4addr;
1892                 }
1893 
1894                 ndev->features |= local->hw.netdev_features;
1895 
1896                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1897 
1898                 /* MTU range: 256 - 2304 */
1899                 ndev->min_mtu = 256;
1900                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1901 
1902                 ret = register_netdevice(ndev);
1903                 if (ret) {
1904                         ieee80211_if_free(ndev);
1905                         return ret;
1906                 }
1907         }
1908 
1909         mutex_lock(&local->iflist_mtx);
1910         list_add_tail_rcu(&sdata->list, &local->interfaces);
1911         mutex_unlock(&local->iflist_mtx);
1912 
1913         if (new_wdev)
1914                 *new_wdev = &sdata->wdev;
1915 
1916         return 0;
1917 }
1918 
1919 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1920 {
1921         ASSERT_RTNL();
1922 
1923         mutex_lock(&sdata->local->iflist_mtx);
1924         list_del_rcu(&sdata->list);
1925         mutex_unlock(&sdata->local->iflist_mtx);
1926 
1927         synchronize_rcu();
1928 
1929         if (sdata->dev) {
1930                 unregister_netdevice(sdata->dev);
1931         } else {
1932                 cfg80211_unregister_wdev(&sdata->wdev);
1933                 ieee80211_teardown_sdata(sdata);
1934                 kfree(sdata);
1935         }
1936 }
1937 
1938 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1939 {
1940         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1941                 return;
1942         ieee80211_do_stop(sdata, true);
1943 }
1944 
1945 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1946 {
1947         struct ieee80211_sub_if_data *sdata, *tmp;
1948         LIST_HEAD(unreg_list);
1949         LIST_HEAD(wdev_list);
1950 
1951         ASSERT_RTNL();
1952 
1953         /* Before destroying the interfaces, make sure they're all stopped so
1954          * that the hardware is stopped. Otherwise, the driver might still be
1955          * iterating the interfaces during the shutdown, e.g. from a worker
1956          * or from RX processing or similar, and if it does so (using atomic
1957          * iteration) while we're manipulating the list, the iteration will
1958          * crash.
1959          *
1960          * After this, the hardware should be stopped and the driver should
1961          * have stopped all of its activities, so that we can do RCU-unaware
1962          * manipulations of the interface list below.
1963          */
1964         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1965 
1966         WARN(local->open_count, "%s: open count remains %d\n",
1967              wiphy_name(local->hw.wiphy), local->open_count);
1968 
1969         mutex_lock(&local->iflist_mtx);
1970         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1971                 list_del(&sdata->list);
1972 
1973                 if (sdata->dev)
1974                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1975                 else
1976                         list_add(&sdata->list, &wdev_list);
1977         }
1978         mutex_unlock(&local->iflist_mtx);
1979         unregister_netdevice_many(&unreg_list);
1980 
1981         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1982                 list_del(&sdata->list);
1983                 cfg80211_unregister_wdev(&sdata->wdev);
1984                 kfree(sdata);
1985         }
1986 }
1987 
1988 static int netdev_notify(struct notifier_block *nb,
1989                          unsigned long state, void *ptr)
1990 {
1991         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1992         struct ieee80211_sub_if_data *sdata;
1993 
1994         if (state != NETDEV_CHANGENAME)
1995                 return NOTIFY_DONE;
1996 
1997         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1998                 return NOTIFY_DONE;
1999 
2000         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2001                 return NOTIFY_DONE;
2002 
2003         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2004         memcpy(sdata->name, dev->name, IFNAMSIZ);
2005         ieee80211_debugfs_rename_netdev(sdata);
2006 
2007         return NOTIFY_OK;
2008 }
2009 
2010 static struct notifier_block mac80211_netdev_notifier = {
2011         .notifier_call = netdev_notify,
2012 };
2013 
2014 int ieee80211_iface_init(void)
2015 {
2016         return register_netdevice_notifier(&mac80211_netdev_notifier);
2017 }
2018 
2019 void ieee80211_iface_exit(void)
2020 {
2021         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2022 }
2023 
2024 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2025 {
2026         if (sdata->vif.type == NL80211_IFTYPE_AP)
2027                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2028         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2029                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2030 }
2031 
2032 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2033 {
2034         if (sdata->vif.type == NL80211_IFTYPE_AP)
2035                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2036         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2037                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2038 }
2039 

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