Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/net/mac80211/iface.c

  1 /*
  2  * Interface handling
  3  *
  4  * Copyright 2002-2005, Instant802 Networks, Inc.
  5  * Copyright 2005-2006, Devicescape Software, Inc.
  6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  8  * Copyright 2013-2014  Intel Mobile Communications GmbH
  9  * 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                 /* XXX: for AP_VLAN, actually track AP queues */
723                 netif_tx_start_all_queues(dev);
724         } else if (dev) {
725                 unsigned long flags;
726                 int n_acs = IEEE80211_NUM_ACS;
727                 int ac;
728 
729                 if (local->hw.queues < IEEE80211_NUM_ACS)
730                         n_acs = 1;
731 
732                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
733                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
734                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
735                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
736                         for (ac = 0; ac < n_acs; ac++) {
737                                 int ac_queue = sdata->vif.hw_queue[ac];
738 
739                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
740                                     skb_queue_empty(&local->pending[ac_queue]))
741                                         netif_start_subqueue(dev, ac);
742                         }
743                 }
744                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
745         }
746 
747         return 0;
748  err_del_interface:
749         drv_remove_interface(local, sdata);
750  err_stop:
751         if (!local->open_count)
752                 drv_stop(local);
753  err_del_bss:
754         sdata->bss = NULL;
755         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
756                 mutex_lock(&local->mtx);
757                 list_del(&sdata->u.vlan.list);
758                 mutex_unlock(&local->mtx);
759         }
760         /* might already be clear but that doesn't matter */
761         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
762         return res;
763 }
764 
765 static int ieee80211_open(struct net_device *dev)
766 {
767         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
768         int err;
769 
770         /* fail early if user set an invalid address */
771         if (!is_valid_ether_addr(dev->dev_addr))
772                 return -EADDRNOTAVAIL;
773 
774         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
775         if (err)
776                 return err;
777 
778         return ieee80211_do_open(&sdata->wdev, true);
779 }
780 
781 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
782                               bool going_down)
783 {
784         struct ieee80211_local *local = sdata->local;
785         struct fq *fq = &local->fq;
786         unsigned long flags;
787         struct sk_buff *skb, *tmp;
788         u32 hw_reconf_flags = 0;
789         int i, flushed;
790         struct ps_data *ps;
791         struct cfg80211_chan_def chandef;
792         bool cancel_scan;
793         struct cfg80211_nan_func *func;
794 
795         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
796 
797         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
798         if (cancel_scan)
799                 ieee80211_scan_cancel(local);
800 
801         /*
802          * Stop TX on this interface first.
803          */
804         if (sdata->dev)
805                 netif_tx_stop_all_queues(sdata->dev);
806 
807         ieee80211_roc_purge(local, sdata);
808 
809         switch (sdata->vif.type) {
810         case NL80211_IFTYPE_STATION:
811                 ieee80211_mgd_stop(sdata);
812                 break;
813         case NL80211_IFTYPE_ADHOC:
814                 ieee80211_ibss_stop(sdata);
815                 break;
816         case NL80211_IFTYPE_AP:
817                 cancel_work_sync(&sdata->u.ap.request_smps_work);
818                 break;
819         default:
820                 break;
821         }
822 
823         /*
824          * Remove all stations associated with this interface.
825          *
826          * This must be done before calling ops->remove_interface()
827          * because otherwise we can later invoke ops->sta_notify()
828          * whenever the STAs are removed, and that invalidates driver
829          * assumptions about always getting a vif pointer that is valid
830          * (because if we remove a STA after ops->remove_interface()
831          * the driver will have removed the vif info already!)
832          *
833          * In WDS mode a station must exist here and be flushed, for
834          * AP_VLANs stations may exist since there's nothing else that
835          * would have removed them, but in other modes there shouldn't
836          * be any stations.
837          */
838         flushed = sta_info_flush(sdata);
839         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
840                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
841                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
842 
843         /* don't count this interface for allmulti while it is down */
844         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
845                 atomic_dec(&local->iff_allmultis);
846 
847         if (sdata->vif.type == NL80211_IFTYPE_AP) {
848                 local->fif_pspoll--;
849                 local->fif_probe_req--;
850         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
851                 local->fif_probe_req--;
852         }
853 
854         if (sdata->dev) {
855                 netif_addr_lock_bh(sdata->dev);
856                 spin_lock_bh(&local->filter_lock);
857                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
858                                  sdata->dev->addr_len);
859                 spin_unlock_bh(&local->filter_lock);
860                 netif_addr_unlock_bh(sdata->dev);
861         }
862 
863         del_timer_sync(&local->dynamic_ps_timer);
864         cancel_work_sync(&local->dynamic_ps_enable_work);
865 
866         cancel_work_sync(&sdata->recalc_smps);
867         sdata_lock(sdata);
868         mutex_lock(&local->mtx);
869         sdata->vif.csa_active = false;
870         if (sdata->vif.type == NL80211_IFTYPE_STATION)
871                 sdata->u.mgd.csa_waiting_bcn = false;
872         if (sdata->csa_block_tx) {
873                 ieee80211_wake_vif_queues(local, sdata,
874                                           IEEE80211_QUEUE_STOP_REASON_CSA);
875                 sdata->csa_block_tx = false;
876         }
877         mutex_unlock(&local->mtx);
878         sdata_unlock(sdata);
879 
880         cancel_work_sync(&sdata->csa_finalize_work);
881 
882         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
883 
884         if (sdata->wdev.cac_started) {
885                 chandef = sdata->vif.bss_conf.chandef;
886                 WARN_ON(local->suspended);
887                 mutex_lock(&local->mtx);
888                 ieee80211_vif_release_channel(sdata);
889                 mutex_unlock(&local->mtx);
890                 cfg80211_cac_event(sdata->dev, &chandef,
891                                    NL80211_RADAR_CAC_ABORTED,
892                                    GFP_KERNEL);
893         }
894 
895         /* APs need special treatment */
896         if (sdata->vif.type == NL80211_IFTYPE_AP) {
897                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
898 
899                 /* down all dependent devices, that is VLANs */
900                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
901                                          u.vlan.list)
902                         dev_close(vlan->dev);
903                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
904         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
905                 /* remove all packets in parent bc_buf pointing to this dev */
906                 ps = &sdata->bss->ps;
907 
908                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
909                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
910                         if (skb->dev == sdata->dev) {
911                                 __skb_unlink(skb, &ps->bc_buf);
912                                 local->total_ps_buffered--;
913                                 ieee80211_free_txskb(&local->hw, skb);
914                         }
915                 }
916                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
917         }
918 
919         if (going_down)
920                 local->open_count--;
921 
922         switch (sdata->vif.type) {
923         case NL80211_IFTYPE_AP_VLAN:
924                 mutex_lock(&local->mtx);
925                 list_del(&sdata->u.vlan.list);
926                 mutex_unlock(&local->mtx);
927                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
928                 /* see comment in the default case below */
929                 ieee80211_free_keys(sdata, true);
930                 /* no need to tell driver */
931                 break;
932         case NL80211_IFTYPE_MONITOR:
933                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
934                         local->cooked_mntrs--;
935                         break;
936                 }
937 
938                 local->monitors--;
939                 if (local->monitors == 0) {
940                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
941                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
942                 }
943 
944                 ieee80211_adjust_monitor_flags(sdata, -1);
945                 break;
946         case NL80211_IFTYPE_NAN:
947                 /* clean all the functions */
948                 spin_lock_bh(&sdata->u.nan.func_lock);
949 
950                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
951                         idr_remove(&sdata->u.nan.function_inst_ids, i);
952                         cfg80211_free_nan_func(func);
953                 }
954                 idr_destroy(&sdata->u.nan.function_inst_ids);
955 
956                 spin_unlock_bh(&sdata->u.nan.func_lock);
957                 break;
958         case NL80211_IFTYPE_P2P_DEVICE:
959                 /* relies on synchronize_rcu() below */
960                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
961                 /* fall through */
962         default:
963                 cancel_work_sync(&sdata->work);
964                 /*
965                  * When we get here, the interface is marked down.
966                  * Free the remaining keys, if there are any
967                  * (which can happen in AP mode if userspace sets
968                  * keys before the interface is operating, and maybe
969                  * also in WDS mode)
970                  *
971                  * Force the key freeing to always synchronize_net()
972                  * to wait for the RX path in case it is using this
973                  * interface enqueuing frames at this very time on
974                  * another CPU.
975                  */
976                 ieee80211_free_keys(sdata, true);
977                 skb_queue_purge(&sdata->skb_queue);
978         }
979 
980         sdata->bss = NULL;
981 
982         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
983         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
984                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
985                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
986                         if (info->control.vif == &sdata->vif) {
987                                 __skb_unlink(skb, &local->pending[i]);
988                                 ieee80211_free_txskb(&local->hw, skb);
989                         }
990                 }
991         }
992         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
993 
994         if (sdata->vif.txq) {
995                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
996 
997                 spin_lock_bh(&fq->lock);
998                 ieee80211_txq_purge(local, txqi);
999                 spin_unlock_bh(&fq->lock);
1000         }
1001 
1002         if (local->open_count == 0)
1003                 ieee80211_clear_tx_pending(local);
1004 
1005         /*
1006          * If the interface goes down while suspended, presumably because
1007          * the device was unplugged and that happens before our resume,
1008          * then the driver is already unconfigured and the remainder of
1009          * this function isn't needed.
1010          * XXX: what about WoWLAN? If the device has software state, e.g.
1011          *      memory allocated, it might expect teardown commands from
1012          *      mac80211 here?
1013          */
1014         if (local->suspended) {
1015                 WARN_ON(local->wowlan);
1016                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1017                 return;
1018         }
1019 
1020         switch (sdata->vif.type) {
1021         case NL80211_IFTYPE_AP_VLAN:
1022                 break;
1023         case NL80211_IFTYPE_MONITOR:
1024                 if (local->monitors == 0)
1025                         ieee80211_del_virtual_monitor(local);
1026 
1027                 mutex_lock(&local->mtx);
1028                 ieee80211_recalc_idle(local);
1029                 mutex_unlock(&local->mtx);
1030 
1031                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1032                         break;
1033 
1034                 /* fall through */
1035         default:
1036                 if (going_down)
1037                         drv_remove_interface(local, sdata);
1038         }
1039 
1040         ieee80211_recalc_ps(local);
1041 
1042         if (cancel_scan)
1043                 flush_delayed_work(&local->scan_work);
1044 
1045         if (local->open_count == 0) {
1046                 ieee80211_stop_device(local);
1047 
1048                 /* no reconfiguring after stop! */
1049                 return;
1050         }
1051 
1052         /* do after stop to avoid reconfiguring when we stop anyway */
1053         ieee80211_configure_filter(local);
1054         ieee80211_hw_config(local, hw_reconf_flags);
1055 
1056         if (local->monitors == local->open_count)
1057                 ieee80211_add_virtual_monitor(local);
1058 }
1059 
1060 static int ieee80211_stop(struct net_device *dev)
1061 {
1062         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1063 
1064         ieee80211_do_stop(sdata, true);
1065 
1066         return 0;
1067 }
1068 
1069 static void ieee80211_set_multicast_list(struct net_device *dev)
1070 {
1071         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1072         struct ieee80211_local *local = sdata->local;
1073         int allmulti, sdata_allmulti;
1074 
1075         allmulti = !!(dev->flags & IFF_ALLMULTI);
1076         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1077 
1078         if (allmulti != sdata_allmulti) {
1079                 if (dev->flags & IFF_ALLMULTI)
1080                         atomic_inc(&local->iff_allmultis);
1081                 else
1082                         atomic_dec(&local->iff_allmultis);
1083                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1084         }
1085 
1086         spin_lock_bh(&local->filter_lock);
1087         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1088         spin_unlock_bh(&local->filter_lock);
1089         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1090 }
1091 
1092 /*
1093  * Called when the netdev is removed or, by the code below, before
1094  * the interface type changes.
1095  */
1096 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1097 {
1098         int i;
1099 
1100         /* free extra data */
1101         ieee80211_free_keys(sdata, false);
1102 
1103         ieee80211_debugfs_remove_netdev(sdata);
1104 
1105         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1106                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1107         sdata->fragment_next = 0;
1108 
1109         if (ieee80211_vif_is_mesh(&sdata->vif))
1110                 ieee80211_mesh_teardown_sdata(sdata);
1111 }
1112 
1113 static void ieee80211_uninit(struct net_device *dev)
1114 {
1115         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1116 }
1117 
1118 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1119                                          struct sk_buff *skb,
1120                                          void *accel_priv,
1121                                          select_queue_fallback_t fallback)
1122 {
1123         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1124 }
1125 
1126 static struct rtnl_link_stats64 *
1127 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1128 {
1129         int i;
1130 
1131         for_each_possible_cpu(i) {
1132                 const struct pcpu_sw_netstats *tstats;
1133                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1134                 unsigned int start;
1135 
1136                 tstats = per_cpu_ptr(dev->tstats, i);
1137 
1138                 do {
1139                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1140                         rx_packets = tstats->rx_packets;
1141                         tx_packets = tstats->tx_packets;
1142                         rx_bytes = tstats->rx_bytes;
1143                         tx_bytes = tstats->tx_bytes;
1144                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1145 
1146                 stats->rx_packets += rx_packets;
1147                 stats->tx_packets += tx_packets;
1148                 stats->rx_bytes   += rx_bytes;
1149                 stats->tx_bytes   += tx_bytes;
1150         }
1151 
1152         return stats;
1153 }
1154 
1155 static const struct net_device_ops ieee80211_dataif_ops = {
1156         .ndo_open               = ieee80211_open,
1157         .ndo_stop               = ieee80211_stop,
1158         .ndo_uninit             = ieee80211_uninit,
1159         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1160         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1161         .ndo_set_mac_address    = ieee80211_change_mac,
1162         .ndo_select_queue       = ieee80211_netdev_select_queue,
1163         .ndo_get_stats64        = ieee80211_get_stats64,
1164 };
1165 
1166 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1167                                           struct sk_buff *skb,
1168                                           void *accel_priv,
1169                                           select_queue_fallback_t fallback)
1170 {
1171         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1172         struct ieee80211_local *local = sdata->local;
1173         struct ieee80211_hdr *hdr;
1174         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1175 
1176         if (local->hw.queues < IEEE80211_NUM_ACS)
1177                 return 0;
1178 
1179         if (skb->len < 4 ||
1180             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1181                 return 0; /* doesn't matter, frame will be dropped */
1182 
1183         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1184 
1185         return ieee80211_select_queue_80211(sdata, skb, hdr);
1186 }
1187 
1188 static const struct net_device_ops ieee80211_monitorif_ops = {
1189         .ndo_open               = ieee80211_open,
1190         .ndo_stop               = ieee80211_stop,
1191         .ndo_uninit             = ieee80211_uninit,
1192         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1193         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1194         .ndo_set_mac_address    = ieee80211_change_mac,
1195         .ndo_select_queue       = ieee80211_monitor_select_queue,
1196         .ndo_get_stats64        = ieee80211_get_stats64,
1197 };
1198 
1199 static void ieee80211_if_free(struct net_device *dev)
1200 {
1201         free_percpu(dev->tstats);
1202         free_netdev(dev);
1203 }
1204 
1205 static void ieee80211_if_setup(struct net_device *dev)
1206 {
1207         ether_setup(dev);
1208         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1209         dev->netdev_ops = &ieee80211_dataif_ops;
1210         dev->destructor = ieee80211_if_free;
1211 }
1212 
1213 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1214 {
1215         ieee80211_if_setup(dev);
1216         dev->priv_flags |= IFF_NO_QUEUE;
1217 }
1218 
1219 static void ieee80211_iface_work(struct work_struct *work)
1220 {
1221         struct ieee80211_sub_if_data *sdata =
1222                 container_of(work, struct ieee80211_sub_if_data, work);
1223         struct ieee80211_local *local = sdata->local;
1224         struct sk_buff *skb;
1225         struct sta_info *sta;
1226         struct ieee80211_ra_tid *ra_tid;
1227         struct ieee80211_rx_agg *rx_agg;
1228 
1229         if (!ieee80211_sdata_running(sdata))
1230                 return;
1231 
1232         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1233                 return;
1234 
1235         if (!ieee80211_can_run_worker(local))
1236                 return;
1237 
1238         /* first process frames */
1239         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1240                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1241 
1242                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1243                         ra_tid = (void *)&skb->cb;
1244                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1245                                                  ra_tid->tid);
1246                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1247                         ra_tid = (void *)&skb->cb;
1248                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1249                                                 ra_tid->tid);
1250                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1251                         rx_agg = (void *)&skb->cb;
1252                         mutex_lock(&local->sta_mtx);
1253                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1254                         if (sta)
1255                                 __ieee80211_start_rx_ba_session(sta,
1256                                                 0, 0, 0, 1, rx_agg->tid,
1257                                                 IEEE80211_MAX_AMPDU_BUF,
1258                                                 false, true);
1259                         mutex_unlock(&local->sta_mtx);
1260                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1261                         rx_agg = (void *)&skb->cb;
1262                         mutex_lock(&local->sta_mtx);
1263                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1264                         if (sta)
1265                                 __ieee80211_stop_rx_ba_session(sta,
1266                                                         rx_agg->tid,
1267                                                         WLAN_BACK_RECIPIENT, 0,
1268                                                         false);
1269                         mutex_unlock(&local->sta_mtx);
1270                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1271                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1272                         int len = skb->len;
1273 
1274                         mutex_lock(&local->sta_mtx);
1275                         sta = sta_info_get_bss(sdata, mgmt->sa);
1276                         if (sta) {
1277                                 switch (mgmt->u.action.u.addba_req.action_code) {
1278                                 case WLAN_ACTION_ADDBA_REQ:
1279                                         ieee80211_process_addba_request(
1280                                                         local, sta, mgmt, len);
1281                                         break;
1282                                 case WLAN_ACTION_ADDBA_RESP:
1283                                         ieee80211_process_addba_resp(local, sta,
1284                                                                      mgmt, len);
1285                                         break;
1286                                 case WLAN_ACTION_DELBA:
1287                                         ieee80211_process_delba(sdata, sta,
1288                                                                 mgmt, len);
1289                                         break;
1290                                 default:
1291                                         WARN_ON(1);
1292                                         break;
1293                                 }
1294                         }
1295                         mutex_unlock(&local->sta_mtx);
1296                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1297                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1298                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1299                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1300                                 struct ieee80211_rx_status *status;
1301                                 enum nl80211_band band;
1302                                 u8 opmode;
1303 
1304                                 status = IEEE80211_SKB_RXCB(skb);
1305                                 band = status->band;
1306                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1307 
1308                                 mutex_lock(&local->sta_mtx);
1309                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1310 
1311                                 if (sta)
1312                                         ieee80211_vht_handle_opmode(sdata, sta,
1313                                                                     opmode,
1314                                                                     band);
1315 
1316                                 mutex_unlock(&local->sta_mtx);
1317                                 break;
1318                         }
1319                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1320                                 ieee80211_process_mu_groups(sdata, mgmt);
1321                                 break;
1322                         default:
1323                                 WARN_ON(1);
1324                                 break;
1325                         }
1326                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1327                         struct ieee80211_hdr *hdr = (void *)mgmt;
1328                         /*
1329                          * So the frame isn't mgmt, but frame_control
1330                          * is at the right place anyway, of course, so
1331                          * the if statement is correct.
1332                          *
1333                          * Warn if we have other data frame types here,
1334                          * they must not get here.
1335                          */
1336                         WARN_ON(hdr->frame_control &
1337                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1338                         WARN_ON(!(hdr->seq_ctrl &
1339                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1340                         /*
1341                          * This was a fragment of a frame, received while
1342                          * a block-ack session was active. That cannot be
1343                          * right, so terminate the session.
1344                          */
1345                         mutex_lock(&local->sta_mtx);
1346                         sta = sta_info_get_bss(sdata, mgmt->sa);
1347                         if (sta) {
1348                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1349                                                 IEEE80211_QOS_CTL_TID_MASK;
1350 
1351                                 __ieee80211_stop_rx_ba_session(
1352                                         sta, tid, WLAN_BACK_RECIPIENT,
1353                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1354                                         true);
1355                         }
1356                         mutex_unlock(&local->sta_mtx);
1357                 } else switch (sdata->vif.type) {
1358                 case NL80211_IFTYPE_STATION:
1359                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1360                         break;
1361                 case NL80211_IFTYPE_ADHOC:
1362                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1363                         break;
1364                 case NL80211_IFTYPE_MESH_POINT:
1365                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1366                                 break;
1367                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1368                         break;
1369                 default:
1370                         WARN(1, "frame for unexpected interface type");
1371                         break;
1372                 }
1373 
1374                 kfree_skb(skb);
1375         }
1376 
1377         /* then other type-dependent work */
1378         switch (sdata->vif.type) {
1379         case NL80211_IFTYPE_STATION:
1380                 ieee80211_sta_work(sdata);
1381                 break;
1382         case NL80211_IFTYPE_ADHOC:
1383                 ieee80211_ibss_work(sdata);
1384                 break;
1385         case NL80211_IFTYPE_MESH_POINT:
1386                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1387                         break;
1388                 ieee80211_mesh_work(sdata);
1389                 break;
1390         case NL80211_IFTYPE_OCB:
1391                 ieee80211_ocb_work(sdata);
1392                 break;
1393         default:
1394                 break;
1395         }
1396 }
1397 
1398 static void ieee80211_recalc_smps_work(struct work_struct *work)
1399 {
1400         struct ieee80211_sub_if_data *sdata =
1401                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1402 
1403         ieee80211_recalc_smps(sdata);
1404 }
1405 
1406 /*
1407  * Helper function to initialise an interface to a specific type.
1408  */
1409 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1410                                   enum nl80211_iftype type)
1411 {
1412         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1413                                                     0xff, 0xff, 0xff};
1414 
1415         /* clear type-dependent union */
1416         memset(&sdata->u, 0, sizeof(sdata->u));
1417 
1418         /* and set some type-dependent values */
1419         sdata->vif.type = type;
1420         sdata->vif.p2p = false;
1421         sdata->wdev.iftype = type;
1422 
1423         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1424         sdata->control_port_no_encrypt = false;
1425         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1426         sdata->vif.bss_conf.idle = true;
1427 
1428         sdata->noack_map = 0;
1429 
1430         /* only monitor/p2p-device differ */
1431         if (sdata->dev) {
1432                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1433                 sdata->dev->type = ARPHRD_ETHER;
1434         }
1435 
1436         skb_queue_head_init(&sdata->skb_queue);
1437         INIT_WORK(&sdata->work, ieee80211_iface_work);
1438         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1439         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1440         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1441         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1442 
1443         switch (type) {
1444         case NL80211_IFTYPE_P2P_GO:
1445                 type = NL80211_IFTYPE_AP;
1446                 sdata->vif.type = type;
1447                 sdata->vif.p2p = true;
1448                 /* fall through */
1449         case NL80211_IFTYPE_AP:
1450                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1451                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1452                 INIT_WORK(&sdata->u.ap.request_smps_work,
1453                           ieee80211_request_smps_ap_work);
1454                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1455                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1456                 break;
1457         case NL80211_IFTYPE_P2P_CLIENT:
1458                 type = NL80211_IFTYPE_STATION;
1459                 sdata->vif.type = type;
1460                 sdata->vif.p2p = true;
1461                 /* fall through */
1462         case NL80211_IFTYPE_STATION:
1463                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1464                 ieee80211_sta_setup_sdata(sdata);
1465                 break;
1466         case NL80211_IFTYPE_OCB:
1467                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1468                 ieee80211_ocb_setup_sdata(sdata);
1469                 break;
1470         case NL80211_IFTYPE_ADHOC:
1471                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1472                 ieee80211_ibss_setup_sdata(sdata);
1473                 break;
1474         case NL80211_IFTYPE_MESH_POINT:
1475                 if (ieee80211_vif_is_mesh(&sdata->vif))
1476                         ieee80211_mesh_init_sdata(sdata);
1477                 break;
1478         case NL80211_IFTYPE_MONITOR:
1479                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1480                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1481                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1482                                       MONITOR_FLAG_OTHER_BSS;
1483                 break;
1484         case NL80211_IFTYPE_WDS:
1485                 sdata->vif.bss_conf.bssid = NULL;
1486                 break;
1487         case NL80211_IFTYPE_NAN:
1488                 idr_init(&sdata->u.nan.function_inst_ids);
1489                 spin_lock_init(&sdata->u.nan.func_lock);
1490                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1491                 break;
1492         case NL80211_IFTYPE_AP_VLAN:
1493         case NL80211_IFTYPE_P2P_DEVICE:
1494                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1495                 break;
1496         case NL80211_IFTYPE_UNSPECIFIED:
1497         case NUM_NL80211_IFTYPES:
1498                 BUG();
1499                 break;
1500         }
1501 
1502         ieee80211_debugfs_add_netdev(sdata);
1503 }
1504 
1505 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1506                                            enum nl80211_iftype type)
1507 {
1508         struct ieee80211_local *local = sdata->local;
1509         int ret, err;
1510         enum nl80211_iftype internal_type = type;
1511         bool p2p = false;
1512 
1513         ASSERT_RTNL();
1514 
1515         if (!local->ops->change_interface)
1516                 return -EBUSY;
1517 
1518         switch (sdata->vif.type) {
1519         case NL80211_IFTYPE_AP:
1520         case NL80211_IFTYPE_STATION:
1521         case NL80211_IFTYPE_ADHOC:
1522         case NL80211_IFTYPE_OCB:
1523                 /*
1524                  * Could maybe also all others here?
1525                  * Just not sure how that interacts
1526                  * with the RX/config path e.g. for
1527                  * mesh.
1528                  */
1529                 break;
1530         default:
1531                 return -EBUSY;
1532         }
1533 
1534         switch (type) {
1535         case NL80211_IFTYPE_AP:
1536         case NL80211_IFTYPE_STATION:
1537         case NL80211_IFTYPE_ADHOC:
1538         case NL80211_IFTYPE_OCB:
1539                 /*
1540                  * Could probably support everything
1541                  * but WDS here (WDS do_open can fail
1542                  * under memory pressure, which this
1543                  * code isn't prepared to handle).
1544                  */
1545                 break;
1546         case NL80211_IFTYPE_P2P_CLIENT:
1547                 p2p = true;
1548                 internal_type = NL80211_IFTYPE_STATION;
1549                 break;
1550         case NL80211_IFTYPE_P2P_GO:
1551                 p2p = true;
1552                 internal_type = NL80211_IFTYPE_AP;
1553                 break;
1554         default:
1555                 return -EBUSY;
1556         }
1557 
1558         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1559         if (ret)
1560                 return ret;
1561 
1562         ieee80211_do_stop(sdata, false);
1563 
1564         ieee80211_teardown_sdata(sdata);
1565 
1566         ret = drv_change_interface(local, sdata, internal_type, p2p);
1567         if (ret)
1568                 type = ieee80211_vif_type_p2p(&sdata->vif);
1569 
1570         /*
1571          * Ignore return value here, there's not much we can do since
1572          * the driver changed the interface type internally already.
1573          * The warnings will hopefully make driver authors fix it :-)
1574          */
1575         ieee80211_check_queues(sdata, type);
1576 
1577         ieee80211_setup_sdata(sdata, type);
1578 
1579         err = ieee80211_do_open(&sdata->wdev, false);
1580         WARN(err, "type change: do_open returned %d", err);
1581 
1582         return ret;
1583 }
1584 
1585 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1586                              enum nl80211_iftype type)
1587 {
1588         int ret;
1589 
1590         ASSERT_RTNL();
1591 
1592         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1593                 return 0;
1594 
1595         if (ieee80211_sdata_running(sdata)) {
1596                 ret = ieee80211_runtime_change_iftype(sdata, type);
1597                 if (ret)
1598                         return ret;
1599         } else {
1600                 /* Purge and reset type-dependent state. */
1601                 ieee80211_teardown_sdata(sdata);
1602                 ieee80211_setup_sdata(sdata, type);
1603         }
1604 
1605         /* reset some values that shouldn't be kept across type changes */
1606         if (type == NL80211_IFTYPE_STATION)
1607                 sdata->u.mgd.use_4addr = false;
1608 
1609         return 0;
1610 }
1611 
1612 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1613                                        u8 *perm_addr, enum nl80211_iftype type)
1614 {
1615         struct ieee80211_sub_if_data *sdata;
1616         u64 mask, start, addr, val, inc;
1617         u8 *m;
1618         u8 tmp_addr[ETH_ALEN];
1619         int i;
1620 
1621         /* default ... something at least */
1622         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1623 
1624         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1625             local->hw.wiphy->n_addresses <= 1)
1626                 return;
1627 
1628         mutex_lock(&local->iflist_mtx);
1629 
1630         switch (type) {
1631         case NL80211_IFTYPE_MONITOR:
1632                 /* doesn't matter */
1633                 break;
1634         case NL80211_IFTYPE_WDS:
1635         case NL80211_IFTYPE_AP_VLAN:
1636                 /* match up with an AP interface */
1637                 list_for_each_entry(sdata, &local->interfaces, list) {
1638                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1639                                 continue;
1640                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1641                         break;
1642                 }
1643                 /* keep default if no AP interface present */
1644                 break;
1645         case NL80211_IFTYPE_P2P_CLIENT:
1646         case NL80211_IFTYPE_P2P_GO:
1647                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1648                         list_for_each_entry(sdata, &local->interfaces, list) {
1649                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1650                                         continue;
1651                                 if (!ieee80211_sdata_running(sdata))
1652                                         continue;
1653                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1654                                 goto out_unlock;
1655                         }
1656                 }
1657                 /* otherwise fall through */
1658         default:
1659                 /* assign a new address if possible -- try n_addresses first */
1660                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1661                         bool used = false;
1662 
1663                         list_for_each_entry(sdata, &local->interfaces, list) {
1664                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1665                                                      sdata->vif.addr)) {
1666                                         used = true;
1667                                         break;
1668                                 }
1669                         }
1670 
1671                         if (!used) {
1672                                 memcpy(perm_addr,
1673                                        local->hw.wiphy->addresses[i].addr,
1674                                        ETH_ALEN);
1675                                 break;
1676                         }
1677                 }
1678 
1679                 /* try mask if available */
1680                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1681                         break;
1682 
1683                 m = local->hw.wiphy->addr_mask;
1684                 mask =  ((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                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1689                         /* not a contiguous mask ... not handled now! */
1690                         pr_info("not contiguous\n");
1691                         break;
1692                 }
1693 
1694                 /*
1695                  * Pick address of existing interface in case user changed
1696                  * MAC address manually, default to perm_addr.
1697                  */
1698                 m = local->hw.wiphy->perm_addr;
1699                 list_for_each_entry(sdata, &local->interfaces, list) {
1700                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1701                                 continue;
1702                         m = sdata->vif.addr;
1703                         break;
1704                 }
1705                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1706                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1707                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1708 
1709                 inc = 1ULL<<__ffs64(mask);
1710                 val = (start & mask);
1711                 addr = (start & ~mask) | (val & mask);
1712                 do {
1713                         bool used = false;
1714 
1715                         tmp_addr[5] = addr >> 0*8;
1716                         tmp_addr[4] = addr >> 1*8;
1717                         tmp_addr[3] = addr >> 2*8;
1718                         tmp_addr[2] = addr >> 3*8;
1719                         tmp_addr[1] = addr >> 4*8;
1720                         tmp_addr[0] = addr >> 5*8;
1721 
1722                         val += inc;
1723 
1724                         list_for_each_entry(sdata, &local->interfaces, list) {
1725                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1726                                         used = true;
1727                                         break;
1728                                 }
1729                         }
1730 
1731                         if (!used) {
1732                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1733                                 break;
1734                         }
1735                         addr = (start & ~mask) | (val & mask);
1736                 } while (addr != start);
1737 
1738                 break;
1739         }
1740 
1741  out_unlock:
1742         mutex_unlock(&local->iflist_mtx);
1743 }
1744 
1745 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1746                      unsigned char name_assign_type,
1747                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1748                      struct vif_params *params)
1749 {
1750         struct net_device *ndev = NULL;
1751         struct ieee80211_sub_if_data *sdata = NULL;
1752         struct txq_info *txqi;
1753         void (*if_setup)(struct net_device *dev);
1754         int ret, i;
1755         int txqs = 1;
1756 
1757         ASSERT_RTNL();
1758 
1759         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1760                 struct wireless_dev *wdev;
1761 
1762                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1763                                 GFP_KERNEL);
1764                 if (!sdata)
1765                         return -ENOMEM;
1766                 wdev = &sdata->wdev;
1767 
1768                 sdata->dev = NULL;
1769                 strlcpy(sdata->name, name, IFNAMSIZ);
1770                 ieee80211_assign_perm_addr(local, wdev->address, type);
1771                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1772         } else {
1773                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1774                                  sizeof(void *));
1775                 int txq_size = 0;
1776 
1777                 if (local->ops->wake_tx_queue)
1778                         txq_size += sizeof(struct txq_info) +
1779                                     local->hw.txq_data_size;
1780 
1781                 if (local->ops->wake_tx_queue)
1782                         if_setup = ieee80211_if_setup_no_queue;
1783                 else
1784                         if_setup = ieee80211_if_setup;
1785 
1786                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1787                         txqs = IEEE80211_NUM_ACS;
1788 
1789                 ndev = alloc_netdev_mqs(size + txq_size,
1790                                         name, name_assign_type,
1791                                         if_setup, txqs, 1);
1792                 if (!ndev)
1793                         return -ENOMEM;
1794                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1795 
1796                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1797                 if (!ndev->tstats) {
1798                         free_netdev(ndev);
1799                         return -ENOMEM;
1800                 }
1801 
1802                 ndev->needed_headroom = local->tx_headroom +
1803                                         4*6 /* four MAC addresses */
1804                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1805                                         + 6 /* mesh */
1806                                         + 8 /* rfc1042/bridge tunnel */
1807                                         - ETH_HLEN /* ethernet hard_header_len */
1808                                         + IEEE80211_ENCRYPT_HEADROOM;
1809                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1810 
1811                 ret = dev_alloc_name(ndev, ndev->name);
1812                 if (ret < 0) {
1813                         ieee80211_if_free(ndev);
1814                         return ret;
1815                 }
1816 
1817                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1818                 if (params && is_valid_ether_addr(params->macaddr))
1819                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1820                 else
1821                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1822                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1823 
1824                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1825                 sdata = netdev_priv(ndev);
1826                 ndev->ieee80211_ptr = &sdata->wdev;
1827                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1828                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1829 
1830                 if (txq_size) {
1831                         txqi = netdev_priv(ndev) + size;
1832                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1833                 }
1834 
1835                 sdata->dev = ndev;
1836         }
1837 
1838         /* initialise type-independent data */
1839         sdata->wdev.wiphy = local->hw.wiphy;
1840         sdata->local = local;
1841 
1842         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1843                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1844 
1845         INIT_LIST_HEAD(&sdata->key_list);
1846 
1847         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1848                           ieee80211_dfs_cac_timer_work);
1849         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1850                           ieee80211_delayed_tailroom_dec);
1851 
1852         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1853                 struct ieee80211_supported_band *sband;
1854                 sband = local->hw.wiphy->bands[i];
1855                 sdata->rc_rateidx_mask[i] =
1856                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1857                 if (sband) {
1858                         __le16 cap;
1859                         u16 *vht_rate_mask;
1860 
1861                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1862                                sband->ht_cap.mcs.rx_mask,
1863                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1864 
1865                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1866                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1867                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1868                 } else {
1869                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1870                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1871                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1872                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1873                 }
1874         }
1875 
1876         ieee80211_set_default_queues(sdata);
1877 
1878         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1879         sdata->user_power_level = local->user_power_level;
1880 
1881         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1882 
1883         /* setup type-dependent data */
1884         ieee80211_setup_sdata(sdata, type);
1885 
1886         if (ndev) {
1887                 if (params) {
1888                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1889                         if (type == NL80211_IFTYPE_STATION)
1890                                 sdata->u.mgd.use_4addr = params->use_4addr;
1891                 }
1892 
1893                 ndev->features |= local->hw.netdev_features;
1894 
1895                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1896 
1897                 /* MTU range: 256 - 2304 */
1898                 ndev->min_mtu = 256;
1899                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1900 
1901                 ret = register_netdevice(ndev);
1902                 if (ret) {
1903                         ieee80211_if_free(ndev);
1904                         return ret;
1905                 }
1906         }
1907 
1908         mutex_lock(&local->iflist_mtx);
1909         list_add_tail_rcu(&sdata->list, &local->interfaces);
1910         mutex_unlock(&local->iflist_mtx);
1911 
1912         if (new_wdev)
1913                 *new_wdev = &sdata->wdev;
1914 
1915         return 0;
1916 }
1917 
1918 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1919 {
1920         ASSERT_RTNL();
1921 
1922         mutex_lock(&sdata->local->iflist_mtx);
1923         list_del_rcu(&sdata->list);
1924         mutex_unlock(&sdata->local->iflist_mtx);
1925 
1926         synchronize_rcu();
1927 
1928         if (sdata->dev) {
1929                 unregister_netdevice(sdata->dev);
1930         } else {
1931                 cfg80211_unregister_wdev(&sdata->wdev);
1932                 ieee80211_teardown_sdata(sdata);
1933                 kfree(sdata);
1934         }
1935 }
1936 
1937 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1938 {
1939         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1940                 return;
1941         ieee80211_do_stop(sdata, true);
1942 }
1943 
1944 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1945 {
1946         struct ieee80211_sub_if_data *sdata, *tmp;
1947         LIST_HEAD(unreg_list);
1948         LIST_HEAD(wdev_list);
1949 
1950         ASSERT_RTNL();
1951 
1952         /* Before destroying the interfaces, make sure they're all stopped so
1953          * that the hardware is stopped. Otherwise, the driver might still be
1954          * iterating the interfaces during the shutdown, e.g. from a worker
1955          * or from RX processing or similar, and if it does so (using atomic
1956          * iteration) while we're manipulating the list, the iteration will
1957          * crash.
1958          *
1959          * After this, the hardware should be stopped and the driver should
1960          * have stopped all of its activities, so that we can do RCU-unaware
1961          * manipulations of the interface list below.
1962          */
1963         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1964 
1965         WARN(local->open_count, "%s: open count remains %d\n",
1966              wiphy_name(local->hw.wiphy), local->open_count);
1967 
1968         mutex_lock(&local->iflist_mtx);
1969         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1970                 list_del(&sdata->list);
1971 
1972                 if (sdata->dev)
1973                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1974                 else
1975                         list_add(&sdata->list, &wdev_list);
1976         }
1977         mutex_unlock(&local->iflist_mtx);
1978         unregister_netdevice_many(&unreg_list);
1979 
1980         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1981                 list_del(&sdata->list);
1982                 cfg80211_unregister_wdev(&sdata->wdev);
1983                 kfree(sdata);
1984         }
1985 }
1986 
1987 static int netdev_notify(struct notifier_block *nb,
1988                          unsigned long state, void *ptr)
1989 {
1990         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1991         struct ieee80211_sub_if_data *sdata;
1992 
1993         if (state != NETDEV_CHANGENAME)
1994                 return NOTIFY_DONE;
1995 
1996         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1997                 return NOTIFY_DONE;
1998 
1999         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2000                 return NOTIFY_DONE;
2001 
2002         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2003         memcpy(sdata->name, dev->name, IFNAMSIZ);
2004         ieee80211_debugfs_rename_netdev(sdata);
2005 
2006         return NOTIFY_OK;
2007 }
2008 
2009 static struct notifier_block mac80211_netdev_notifier = {
2010         .notifier_call = netdev_notify,
2011 };
2012 
2013 int ieee80211_iface_init(void)
2014 {
2015         return register_netdevice_notifier(&mac80211_netdev_notifier);
2016 }
2017 
2018 void ieee80211_iface_exit(void)
2019 {
2020         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2021 }
2022 
2023 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2024 {
2025         if (sdata->vif.type == NL80211_IFTYPE_AP)
2026                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2027         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2028                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2029 }
2030 
2031 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2032 {
2033         if (sdata->vif.type == NL80211_IFTYPE_AP)
2034                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2035         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2036                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2037 }
2038 

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