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Linux/net/mac80211/iface.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Interface handling
  4  *
  5  * Copyright 2002-2005, Instant802 Networks, Inc.
  6  * Copyright 2005-2006, Devicescape Software, Inc.
  7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  9  * Copyright 2013-2014  Intel Mobile Communications GmbH
 10  * Copyright (c) 2016        Intel Deutschland GmbH
 11  * Copyright (C) 2018-2020 Intel Corporation
 12  */
 13 #include <linux/slab.h>
 14 #include <linux/kernel.h>
 15 #include <linux/if_arp.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/rtnetlink.h>
 18 #include <net/mac80211.h>
 19 #include <net/ieee80211_radiotap.h>
 20 #include "ieee80211_i.h"
 21 #include "sta_info.h"
 22 #include "debugfs_netdev.h"
 23 #include "mesh.h"
 24 #include "led.h"
 25 #include "driver-ops.h"
 26 #include "wme.h"
 27 #include "rate.h"
 28 
 29 /**
 30  * DOC: Interface list locking
 31  *
 32  * The interface list in each struct ieee80211_local is protected
 33  * three-fold:
 34  *
 35  * (1) modifications may only be done under the RTNL
 36  * (2) modifications and readers are protected against each other by
 37  *     the iflist_mtx.
 38  * (3) modifications are done in an RCU manner so atomic readers
 39  *     can traverse the list in RCU-safe blocks.
 40  *
 41  * As a consequence, reads (traversals) of the list can be protected
 42  * by either the RTNL, the iflist_mtx or RCU.
 43  */
 44 
 45 static void ieee80211_iface_work(struct work_struct *work);
 46 
 47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 48 {
 49         struct ieee80211_chanctx_conf *chanctx_conf;
 50         int power;
 51 
 52         rcu_read_lock();
 53         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 54         if (!chanctx_conf) {
 55                 rcu_read_unlock();
 56                 return false;
 57         }
 58 
 59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 60         rcu_read_unlock();
 61 
 62         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 63                 power = min(power, sdata->user_power_level);
 64 
 65         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 66                 power = min(power, sdata->ap_power_level);
 67 
 68         if (power != sdata->vif.bss_conf.txpower) {
 69                 sdata->vif.bss_conf.txpower = power;
 70                 ieee80211_hw_config(sdata->local, 0);
 71                 return true;
 72         }
 73 
 74         return false;
 75 }
 76 
 77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 78                               bool update_bss)
 79 {
 80         if (__ieee80211_recalc_txpower(sdata) ||
 81             (update_bss && ieee80211_sdata_running(sdata)))
 82                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 83 }
 84 
 85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 86 {
 87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 88                 return 0;
 89 
 90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 91         return IEEE80211_CONF_CHANGE_IDLE;
 92 }
 93 
 94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 95 {
 96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 97                 return 0;
 98 
 99         ieee80211_flush_queues(local, NULL, false);
100 
101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
102         return IEEE80211_CONF_CHANGE_IDLE;
103 }
104 
105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
106                                    bool force_active)
107 {
108         bool working, scanning, active;
109         unsigned int led_trig_start = 0, led_trig_stop = 0;
110 
111         lockdep_assert_held(&local->mtx);
112 
113         active = force_active ||
114                  !list_empty(&local->chanctx_list) ||
115                  local->monitors;
116 
117         working = !local->ops->remain_on_channel &&
118                   !list_empty(&local->roc_list);
119 
120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
122 
123         if (working || scanning)
124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125         else
126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 
128         if (active)
129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130         else
131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 
133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
134 
135         if (working || scanning || active)
136                 return __ieee80211_idle_off(local);
137         return __ieee80211_idle_on(local);
138 }
139 
140 u32 ieee80211_idle_off(struct ieee80211_local *local)
141 {
142         return __ieee80211_recalc_idle(local, true);
143 }
144 
145 void ieee80211_recalc_idle(struct ieee80211_local *local)
146 {
147         u32 change = __ieee80211_recalc_idle(local, false);
148         if (change)
149                 ieee80211_hw_config(local, change);
150 }
151 
152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
153                                 bool check_dup)
154 {
155         struct ieee80211_local *local = sdata->local;
156         struct ieee80211_sub_if_data *iter;
157         u64 new, mask, tmp;
158         u8 *m;
159         int ret = 0;
160 
161         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
162                 return 0;
163 
164         m = addr;
165         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
166                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
167                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
168 
169         m = local->hw.wiphy->addr_mask;
170         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
173 
174         if (!check_dup)
175                 return ret;
176 
177         mutex_lock(&local->iflist_mtx);
178         list_for_each_entry(iter, &local->interfaces, list) {
179                 if (iter == sdata)
180                         continue;
181 
182                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
183                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
184                         continue;
185 
186                 m = iter->vif.addr;
187                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
188                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
189                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
190 
191                 if ((new & ~mask) != (tmp & ~mask)) {
192                         ret = -EINVAL;
193                         break;
194                 }
195         }
196         mutex_unlock(&local->iflist_mtx);
197 
198         return ret;
199 }
200 
201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
202 {
203         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
204         struct sockaddr *sa = addr;
205         bool check_dup = true;
206         int ret;
207 
208         if (ieee80211_sdata_running(sdata))
209                 return -EBUSY;
210 
211         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
212             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
213                 check_dup = false;
214 
215         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
216         if (ret)
217                 return ret;
218 
219         ret = eth_mac_addr(dev, sa);
220 
221         if (ret == 0)
222                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
223 
224         return ret;
225 }
226 
227 static inline int identical_mac_addr_allowed(int type1, int type2)
228 {
229         return type1 == NL80211_IFTYPE_MONITOR ||
230                 type2 == NL80211_IFTYPE_MONITOR ||
231                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
232                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
233                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
234                 (type1 == NL80211_IFTYPE_WDS &&
235                         (type2 == NL80211_IFTYPE_WDS ||
236                          type2 == NL80211_IFTYPE_AP)) ||
237                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
238                 (type1 == NL80211_IFTYPE_AP_VLAN &&
239                         (type2 == NL80211_IFTYPE_AP ||
240                          type2 == NL80211_IFTYPE_AP_VLAN));
241 }
242 
243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
244                                             enum nl80211_iftype iftype)
245 {
246         struct ieee80211_local *local = sdata->local;
247         struct ieee80211_sub_if_data *nsdata;
248         int ret;
249 
250         ASSERT_RTNL();
251 
252         /* we hold the RTNL here so can safely walk the list */
253         list_for_each_entry(nsdata, &local->interfaces, list) {
254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
255                         /*
256                          * Only OCB and monitor mode may coexist
257                          */
258                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
259                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
260                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
261                              nsdata->vif.type == NL80211_IFTYPE_OCB))
262                                 return -EBUSY;
263 
264                         /*
265                          * Allow only a single IBSS interface to be up at any
266                          * time. This is restricted because beacon distribution
267                          * cannot work properly if both are in the same IBSS.
268                          *
269                          * To remove this restriction we'd have to disallow them
270                          * from setting the same SSID on different IBSS interfaces
271                          * belonging to the same hardware. Then, however, we're
272                          * faced with having to adopt two different TSF timers...
273                          */
274                         if (iftype == NL80211_IFTYPE_ADHOC &&
275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276                                 return -EBUSY;
277                         /*
278                          * will not add another interface while any channel
279                          * switch is active.
280                          */
281                         if (nsdata->vif.csa_active)
282                                 return -EBUSY;
283 
284                         /*
285                          * The remaining checks are only performed for interfaces
286                          * with the same MAC address.
287                          */
288                         if (!ether_addr_equal(sdata->vif.addr,
289                                               nsdata->vif.addr))
290                                 continue;
291 
292                         /*
293                          * check whether it may have the same address
294                          */
295                         if (!identical_mac_addr_allowed(iftype,
296                                                         nsdata->vif.type))
297                                 return -ENOTUNIQ;
298 
299                         /*
300                          * can only add VLANs to enabled APs
301                          */
302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
303                             nsdata->vif.type == NL80211_IFTYPE_AP)
304                                 sdata->bss = &nsdata->u.ap;
305                 }
306         }
307 
308         mutex_lock(&local->chanctx_mtx);
309         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
310         mutex_unlock(&local->chanctx_mtx);
311         return ret;
312 }
313 
314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
315                                   enum nl80211_iftype iftype)
316 {
317         int n_queues = sdata->local->hw.queues;
318         int i;
319 
320         if (iftype == NL80211_IFTYPE_NAN)
321                 return 0;
322 
323         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
324                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
326                                          IEEE80211_INVAL_HW_QUEUE))
327                                 return -EINVAL;
328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
329                                          n_queues))
330                                 return -EINVAL;
331                 }
332         }
333 
334         if ((iftype != NL80211_IFTYPE_AP &&
335              iftype != NL80211_IFTYPE_P2P_GO &&
336              iftype != NL80211_IFTYPE_MESH_POINT) ||
337             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
338                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
339                 return 0;
340         }
341 
342         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
343                 return -EINVAL;
344 
345         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
346                 return -EINVAL;
347 
348         return 0;
349 }
350 
351 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
352                                     const int offset)
353 {
354         struct ieee80211_local *local = sdata->local;
355         u32 flags = sdata->u.mntr.flags;
356 
357 #define ADJUST(_f, _s)  do {                                    \
358         if (flags & MONITOR_FLAG_##_f)                          \
359                 local->fif_##_s += offset;                      \
360         } while (0)
361 
362         ADJUST(FCSFAIL, fcsfail);
363         ADJUST(PLCPFAIL, plcpfail);
364         ADJUST(CONTROL, control);
365         ADJUST(CONTROL, pspoll);
366         ADJUST(OTHER_BSS, other_bss);
367 
368 #undef ADJUST
369 }
370 
371 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
372 {
373         struct ieee80211_local *local = sdata->local;
374         int i;
375 
376         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
377                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
378                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
379                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
380                         sdata->vif.hw_queue[i] = i;
381                 else
382                         sdata->vif.hw_queue[i] = 0;
383         }
384         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
385 }
386 
387 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
388 {
389         struct ieee80211_sub_if_data *sdata;
390         int ret;
391 
392         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
393                 return 0;
394 
395         ASSERT_RTNL();
396 
397         if (local->monitor_sdata)
398                 return 0;
399 
400         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
401         if (!sdata)
402                 return -ENOMEM;
403 
404         /* set up data */
405         sdata->local = local;
406         sdata->vif.type = NL80211_IFTYPE_MONITOR;
407         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
408                  wiphy_name(local->hw.wiphy));
409         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
410 
411         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
412 
413         ieee80211_set_default_queues(sdata);
414 
415         ret = drv_add_interface(local, sdata);
416         if (WARN_ON(ret)) {
417                 /* ok .. stupid driver, it asked for this! */
418                 kfree(sdata);
419                 return ret;
420         }
421 
422         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
423         if (ret) {
424                 kfree(sdata);
425                 return ret;
426         }
427 
428         mutex_lock(&local->iflist_mtx);
429         rcu_assign_pointer(local->monitor_sdata, sdata);
430         mutex_unlock(&local->iflist_mtx);
431 
432         mutex_lock(&local->mtx);
433         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
434                                         IEEE80211_CHANCTX_EXCLUSIVE);
435         mutex_unlock(&local->mtx);
436         if (ret) {
437                 mutex_lock(&local->iflist_mtx);
438                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
439                 mutex_unlock(&local->iflist_mtx);
440                 synchronize_net();
441                 drv_remove_interface(local, sdata);
442                 kfree(sdata);
443                 return ret;
444         }
445 
446         skb_queue_head_init(&sdata->skb_queue);
447         INIT_WORK(&sdata->work, ieee80211_iface_work);
448 
449         return 0;
450 }
451 
452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
453 {
454         struct ieee80211_sub_if_data *sdata;
455 
456         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
457                 return;
458 
459         ASSERT_RTNL();
460 
461         mutex_lock(&local->iflist_mtx);
462 
463         sdata = rcu_dereference_protected(local->monitor_sdata,
464                                           lockdep_is_held(&local->iflist_mtx));
465         if (!sdata) {
466                 mutex_unlock(&local->iflist_mtx);
467                 return;
468         }
469 
470         RCU_INIT_POINTER(local->monitor_sdata, NULL);
471         mutex_unlock(&local->iflist_mtx);
472 
473         synchronize_net();
474 
475         mutex_lock(&local->mtx);
476         ieee80211_vif_release_channel(sdata);
477         mutex_unlock(&local->mtx);
478 
479         drv_remove_interface(local, sdata);
480 
481         kfree(sdata);
482 }
483 
484 /*
485  * NOTE: Be very careful when changing this function, it must NOT return
486  * an error on interface type changes that have been pre-checked, so most
487  * checks should be in ieee80211_check_concurrent_iface.
488  */
489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
490 {
491         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
492         struct net_device *dev = wdev->netdev;
493         struct ieee80211_local *local = sdata->local;
494         struct sta_info *sta;
495         u32 changed = 0;
496         int res;
497         u32 hw_reconf_flags = 0;
498 
499         switch (sdata->vif.type) {
500         case NL80211_IFTYPE_WDS:
501                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
502                         return -ENOLINK;
503                 break;
504         case NL80211_IFTYPE_AP_VLAN: {
505                 struct ieee80211_sub_if_data *master;
506 
507                 if (!sdata->bss)
508                         return -ENOLINK;
509 
510                 mutex_lock(&local->mtx);
511                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
512                 mutex_unlock(&local->mtx);
513 
514                 master = container_of(sdata->bss,
515                                       struct ieee80211_sub_if_data, u.ap);
516                 sdata->control_port_protocol =
517                         master->control_port_protocol;
518                 sdata->control_port_no_encrypt =
519                         master->control_port_no_encrypt;
520                 sdata->control_port_over_nl80211 =
521                         master->control_port_over_nl80211;
522                 sdata->control_port_no_preauth =
523                         master->control_port_no_preauth;
524                 sdata->vif.cab_queue = master->vif.cab_queue;
525                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
526                        sizeof(sdata->vif.hw_queue));
527                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
528 
529                 mutex_lock(&local->key_mtx);
530                 sdata->crypto_tx_tailroom_needed_cnt +=
531                         master->crypto_tx_tailroom_needed_cnt;
532                 mutex_unlock(&local->key_mtx);
533 
534                 break;
535                 }
536         case NL80211_IFTYPE_AP:
537                 sdata->bss = &sdata->u.ap;
538                 break;
539         case NL80211_IFTYPE_MESH_POINT:
540         case NL80211_IFTYPE_STATION:
541         case NL80211_IFTYPE_MONITOR:
542         case NL80211_IFTYPE_ADHOC:
543         case NL80211_IFTYPE_P2P_DEVICE:
544         case NL80211_IFTYPE_OCB:
545         case NL80211_IFTYPE_NAN:
546                 /* no special treatment */
547                 break;
548         case NL80211_IFTYPE_UNSPECIFIED:
549         case NUM_NL80211_IFTYPES:
550         case NL80211_IFTYPE_P2P_CLIENT:
551         case NL80211_IFTYPE_P2P_GO:
552                 /* cannot happen */
553                 WARN_ON(1);
554                 break;
555         }
556 
557         if (local->open_count == 0) {
558                 res = drv_start(local);
559                 if (res)
560                         goto err_del_bss;
561                 /* we're brought up, everything changes */
562                 hw_reconf_flags = ~0;
563                 ieee80211_led_radio(local, true);
564                 ieee80211_mod_tpt_led_trig(local,
565                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
566         }
567 
568         /*
569          * Copy the hopefully now-present MAC address to
570          * this interface, if it has the special null one.
571          */
572         if (dev && is_zero_ether_addr(dev->dev_addr)) {
573                 memcpy(dev->dev_addr,
574                        local->hw.wiphy->perm_addr,
575                        ETH_ALEN);
576                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
577 
578                 if (!is_valid_ether_addr(dev->dev_addr)) {
579                         res = -EADDRNOTAVAIL;
580                         goto err_stop;
581                 }
582         }
583 
584         switch (sdata->vif.type) {
585         case NL80211_IFTYPE_AP_VLAN:
586                 /* no need to tell driver, but set carrier and chanctx */
587                 if (rtnl_dereference(sdata->bss->beacon)) {
588                         ieee80211_vif_vlan_copy_chanctx(sdata);
589                         netif_carrier_on(dev);
590                 } else {
591                         netif_carrier_off(dev);
592                 }
593                 break;
594         case NL80211_IFTYPE_MONITOR:
595                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
596                         local->cooked_mntrs++;
597                         break;
598                 }
599 
600                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
601                         res = drv_add_interface(local, sdata);
602                         if (res)
603                                 goto err_stop;
604                 } else if (local->monitors == 0 && local->open_count == 0) {
605                         res = ieee80211_add_virtual_monitor(local);
606                         if (res)
607                                 goto err_stop;
608                 }
609 
610                 /* must be before the call to ieee80211_configure_filter */
611                 local->monitors++;
612                 if (local->monitors == 1) {
613                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
614                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
615                 }
616 
617                 ieee80211_adjust_monitor_flags(sdata, 1);
618                 ieee80211_configure_filter(local);
619                 mutex_lock(&local->mtx);
620                 ieee80211_recalc_idle(local);
621                 mutex_unlock(&local->mtx);
622 
623                 netif_carrier_on(dev);
624                 break;
625         default:
626                 if (coming_up) {
627                         ieee80211_del_virtual_monitor(local);
628 
629                         res = drv_add_interface(local, sdata);
630                         if (res)
631                                 goto err_stop;
632                         res = ieee80211_check_queues(sdata,
633                                 ieee80211_vif_type_p2p(&sdata->vif));
634                         if (res)
635                                 goto err_del_interface;
636                 }
637 
638                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
639                         local->fif_pspoll++;
640                         local->fif_probe_req++;
641 
642                         ieee80211_configure_filter(local);
643                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
644                         local->fif_probe_req++;
645                 }
646 
647                 if (sdata->vif.probe_req_reg)
648                         drv_config_iface_filter(local, sdata,
649                                                 FIF_PROBE_REQ,
650                                                 FIF_PROBE_REQ);
651 
652                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
653                     sdata->vif.type != NL80211_IFTYPE_NAN)
654                         changed |= ieee80211_reset_erp_info(sdata);
655                 ieee80211_bss_info_change_notify(sdata, changed);
656 
657                 switch (sdata->vif.type) {
658                 case NL80211_IFTYPE_STATION:
659                 case NL80211_IFTYPE_ADHOC:
660                 case NL80211_IFTYPE_AP:
661                 case NL80211_IFTYPE_MESH_POINT:
662                 case NL80211_IFTYPE_OCB:
663                         netif_carrier_off(dev);
664                         break;
665                 case NL80211_IFTYPE_WDS:
666                 case NL80211_IFTYPE_P2P_DEVICE:
667                 case NL80211_IFTYPE_NAN:
668                         break;
669                 default:
670                         /* not reached */
671                         WARN_ON(1);
672                 }
673 
674                 /*
675                  * Set default queue parameters so drivers don't
676                  * need to initialise the hardware if the hardware
677                  * doesn't start up with sane defaults.
678                  * Enable QoS for anything but station interfaces.
679                  */
680                 ieee80211_set_wmm_default(sdata, true,
681                         sdata->vif.type != NL80211_IFTYPE_STATION);
682         }
683 
684         set_bit(SDATA_STATE_RUNNING, &sdata->state);
685 
686         switch (sdata->vif.type) {
687         case NL80211_IFTYPE_WDS:
688                 /* Create STA entry for the WDS peer */
689                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
690                                      GFP_KERNEL);
691                 if (!sta) {
692                         res = -ENOMEM;
693                         goto err_del_interface;
694                 }
695 
696                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
697                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
698                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
699 
700                 res = sta_info_insert(sta);
701                 if (res) {
702                         /* STA has been freed */
703                         goto err_del_interface;
704                 }
705 
706                 rate_control_rate_init(sta);
707                 netif_carrier_on(dev);
708                 break;
709         case NL80211_IFTYPE_P2P_DEVICE:
710                 rcu_assign_pointer(local->p2p_sdata, sdata);
711                 break;
712         case NL80211_IFTYPE_MONITOR:
713                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
714                         break;
715                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
716                 break;
717         default:
718                 break;
719         }
720 
721         /*
722          * set_multicast_list will be invoked by the networking core
723          * which will check whether any increments here were done in
724          * error and sync them down to the hardware as filter flags.
725          */
726         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
727                 atomic_inc(&local->iff_allmultis);
728 
729         if (coming_up)
730                 local->open_count++;
731 
732         if (hw_reconf_flags)
733                 ieee80211_hw_config(local, hw_reconf_flags);
734 
735         ieee80211_recalc_ps(local);
736 
737         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
738             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
739             local->ops->wake_tx_queue) {
740                 /* XXX: for AP_VLAN, actually track AP queues */
741                 if (dev)
742                         netif_tx_start_all_queues(dev);
743         } else if (dev) {
744                 unsigned long flags;
745                 int n_acs = IEEE80211_NUM_ACS;
746                 int ac;
747 
748                 if (local->hw.queues < IEEE80211_NUM_ACS)
749                         n_acs = 1;
750 
751                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
752                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
753                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
754                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
755                         for (ac = 0; ac < n_acs; ac++) {
756                                 int ac_queue = sdata->vif.hw_queue[ac];
757 
758                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
759                                     skb_queue_empty(&local->pending[ac_queue]))
760                                         netif_start_subqueue(dev, ac);
761                         }
762                 }
763                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
764         }
765 
766         return 0;
767  err_del_interface:
768         drv_remove_interface(local, sdata);
769  err_stop:
770         if (!local->open_count)
771                 drv_stop(local);
772  err_del_bss:
773         sdata->bss = NULL;
774         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
775                 mutex_lock(&local->mtx);
776                 list_del(&sdata->u.vlan.list);
777                 mutex_unlock(&local->mtx);
778         }
779         /* might already be clear but that doesn't matter */
780         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
781         return res;
782 }
783 
784 static int ieee80211_open(struct net_device *dev)
785 {
786         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
787         int err;
788 
789         /* fail early if user set an invalid address */
790         if (!is_valid_ether_addr(dev->dev_addr))
791                 return -EADDRNOTAVAIL;
792 
793         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
794         if (err)
795                 return err;
796 
797         return ieee80211_do_open(&sdata->wdev, true);
798 }
799 
800 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
801                               bool going_down)
802 {
803         struct ieee80211_local *local = sdata->local;
804         unsigned long flags;
805         struct sk_buff *skb, *tmp;
806         u32 hw_reconf_flags = 0;
807         int i, flushed;
808         struct ps_data *ps;
809         struct cfg80211_chan_def chandef;
810         bool cancel_scan;
811         struct cfg80211_nan_func *func;
812 
813         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
814 
815         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
816         if (cancel_scan)
817                 ieee80211_scan_cancel(local);
818 
819         /*
820          * Stop TX on this interface first.
821          */
822         if (sdata->dev)
823                 netif_tx_stop_all_queues(sdata->dev);
824 
825         ieee80211_roc_purge(local, sdata);
826 
827         switch (sdata->vif.type) {
828         case NL80211_IFTYPE_STATION:
829                 ieee80211_mgd_stop(sdata);
830                 break;
831         case NL80211_IFTYPE_ADHOC:
832                 ieee80211_ibss_stop(sdata);
833                 break;
834         case NL80211_IFTYPE_MONITOR:
835                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
836                         break;
837                 list_del_rcu(&sdata->u.mntr.list);
838                 break;
839         default:
840                 break;
841         }
842 
843         /*
844          * Remove all stations associated with this interface.
845          *
846          * This must be done before calling ops->remove_interface()
847          * because otherwise we can later invoke ops->sta_notify()
848          * whenever the STAs are removed, and that invalidates driver
849          * assumptions about always getting a vif pointer that is valid
850          * (because if we remove a STA after ops->remove_interface()
851          * the driver will have removed the vif info already!)
852          *
853          * In WDS mode a station must exist here and be flushed, for
854          * AP_VLANs stations may exist since there's nothing else that
855          * would have removed them, but in other modes there shouldn't
856          * be any stations.
857          */
858         flushed = sta_info_flush(sdata);
859         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
860                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
861                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
862 
863         /* don't count this interface for allmulti while it is down */
864         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
865                 atomic_dec(&local->iff_allmultis);
866 
867         if (sdata->vif.type == NL80211_IFTYPE_AP) {
868                 local->fif_pspoll--;
869                 local->fif_probe_req--;
870         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
871                 local->fif_probe_req--;
872         }
873 
874         if (sdata->dev) {
875                 netif_addr_lock_bh(sdata->dev);
876                 spin_lock_bh(&local->filter_lock);
877                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
878                                  sdata->dev->addr_len);
879                 spin_unlock_bh(&local->filter_lock);
880                 netif_addr_unlock_bh(sdata->dev);
881         }
882 
883         del_timer_sync(&local->dynamic_ps_timer);
884         cancel_work_sync(&local->dynamic_ps_enable_work);
885 
886         cancel_work_sync(&sdata->recalc_smps);
887         sdata_lock(sdata);
888         mutex_lock(&local->mtx);
889         sdata->vif.csa_active = false;
890         if (sdata->vif.type == NL80211_IFTYPE_STATION)
891                 sdata->u.mgd.csa_waiting_bcn = false;
892         if (sdata->csa_block_tx) {
893                 ieee80211_wake_vif_queues(local, sdata,
894                                           IEEE80211_QUEUE_STOP_REASON_CSA);
895                 sdata->csa_block_tx = false;
896         }
897         mutex_unlock(&local->mtx);
898         sdata_unlock(sdata);
899 
900         cancel_work_sync(&sdata->csa_finalize_work);
901 
902         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
903 
904         if (sdata->wdev.cac_started) {
905                 chandef = sdata->vif.bss_conf.chandef;
906                 WARN_ON(local->suspended);
907                 mutex_lock(&local->mtx);
908                 ieee80211_vif_release_channel(sdata);
909                 mutex_unlock(&local->mtx);
910                 cfg80211_cac_event(sdata->dev, &chandef,
911                                    NL80211_RADAR_CAC_ABORTED,
912                                    GFP_KERNEL);
913         }
914 
915         /* APs need special treatment */
916         if (sdata->vif.type == NL80211_IFTYPE_AP) {
917                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
918 
919                 /* down all dependent devices, that is VLANs */
920                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
921                                          u.vlan.list)
922                         dev_close(vlan->dev);
923                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
924         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
925                 /* remove all packets in parent bc_buf pointing to this dev */
926                 ps = &sdata->bss->ps;
927 
928                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
929                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
930                         if (skb->dev == sdata->dev) {
931                                 __skb_unlink(skb, &ps->bc_buf);
932                                 local->total_ps_buffered--;
933                                 ieee80211_free_txskb(&local->hw, skb);
934                         }
935                 }
936                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
937         }
938 
939         if (going_down)
940                 local->open_count--;
941 
942         switch (sdata->vif.type) {
943         case NL80211_IFTYPE_AP_VLAN:
944                 mutex_lock(&local->mtx);
945                 list_del(&sdata->u.vlan.list);
946                 mutex_unlock(&local->mtx);
947                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
948                 /* see comment in the default case below */
949                 ieee80211_free_keys(sdata, true);
950                 /* no need to tell driver */
951                 break;
952         case NL80211_IFTYPE_MONITOR:
953                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
954                         local->cooked_mntrs--;
955                         break;
956                 }
957 
958                 local->monitors--;
959                 if (local->monitors == 0) {
960                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
961                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
962                 }
963 
964                 ieee80211_adjust_monitor_flags(sdata, -1);
965                 break;
966         case NL80211_IFTYPE_NAN:
967                 /* clean all the functions */
968                 spin_lock_bh(&sdata->u.nan.func_lock);
969 
970                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
971                         idr_remove(&sdata->u.nan.function_inst_ids, i);
972                         cfg80211_free_nan_func(func);
973                 }
974                 idr_destroy(&sdata->u.nan.function_inst_ids);
975 
976                 spin_unlock_bh(&sdata->u.nan.func_lock);
977                 break;
978         case NL80211_IFTYPE_P2P_DEVICE:
979                 /* relies on synchronize_rcu() below */
980                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
981                 /* fall through */
982         default:
983                 cancel_work_sync(&sdata->work);
984                 /*
985                  * When we get here, the interface is marked down.
986                  * Free the remaining keys, if there are any
987                  * (which can happen in AP mode if userspace sets
988                  * keys before the interface is operating, and maybe
989                  * also in WDS mode)
990                  *
991                  * Force the key freeing to always synchronize_net()
992                  * to wait for the RX path in case it is using this
993                  * interface enqueuing frames at this very time on
994                  * another CPU.
995                  */
996                 ieee80211_free_keys(sdata, true);
997                 skb_queue_purge(&sdata->skb_queue);
998         }
999 
1000         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1001         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1002                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1003                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1004                         if (info->control.vif == &sdata->vif) {
1005                                 __skb_unlink(skb, &local->pending[i]);
1006                                 ieee80211_free_txskb(&local->hw, skb);
1007                         }
1008                 }
1009         }
1010         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1011 
1012         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1013                 ieee80211_txq_remove_vlan(local, sdata);
1014 
1015         sdata->bss = NULL;
1016 
1017         if (local->open_count == 0)
1018                 ieee80211_clear_tx_pending(local);
1019 
1020         sdata->vif.bss_conf.beacon_int = 0;
1021 
1022         /*
1023          * If the interface goes down while suspended, presumably because
1024          * the device was unplugged and that happens before our resume,
1025          * then the driver is already unconfigured and the remainder of
1026          * this function isn't needed.
1027          * XXX: what about WoWLAN? If the device has software state, e.g.
1028          *      memory allocated, it might expect teardown commands from
1029          *      mac80211 here?
1030          */
1031         if (local->suspended) {
1032                 WARN_ON(local->wowlan);
1033                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1034                 return;
1035         }
1036 
1037         switch (sdata->vif.type) {
1038         case NL80211_IFTYPE_AP_VLAN:
1039                 break;
1040         case NL80211_IFTYPE_MONITOR:
1041                 if (local->monitors == 0)
1042                         ieee80211_del_virtual_monitor(local);
1043 
1044                 mutex_lock(&local->mtx);
1045                 ieee80211_recalc_idle(local);
1046                 mutex_unlock(&local->mtx);
1047 
1048                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1049                         break;
1050 
1051                 /* fall through */
1052         default:
1053                 if (going_down)
1054                         drv_remove_interface(local, sdata);
1055         }
1056 
1057         ieee80211_recalc_ps(local);
1058 
1059         if (cancel_scan)
1060                 flush_delayed_work(&local->scan_work);
1061 
1062         if (local->open_count == 0) {
1063                 ieee80211_stop_device(local);
1064 
1065                 /* no reconfiguring after stop! */
1066                 return;
1067         }
1068 
1069         /* do after stop to avoid reconfiguring when we stop anyway */
1070         ieee80211_configure_filter(local);
1071         ieee80211_hw_config(local, hw_reconf_flags);
1072 
1073         if (local->monitors == local->open_count)
1074                 ieee80211_add_virtual_monitor(local);
1075 }
1076 
1077 static int ieee80211_stop(struct net_device *dev)
1078 {
1079         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080 
1081         ieee80211_do_stop(sdata, true);
1082 
1083         return 0;
1084 }
1085 
1086 static void ieee80211_set_multicast_list(struct net_device *dev)
1087 {
1088         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1089         struct ieee80211_local *local = sdata->local;
1090         int allmulti, sdata_allmulti;
1091 
1092         allmulti = !!(dev->flags & IFF_ALLMULTI);
1093         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1094 
1095         if (allmulti != sdata_allmulti) {
1096                 if (dev->flags & IFF_ALLMULTI)
1097                         atomic_inc(&local->iff_allmultis);
1098                 else
1099                         atomic_dec(&local->iff_allmultis);
1100                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1101         }
1102 
1103         spin_lock_bh(&local->filter_lock);
1104         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1105         spin_unlock_bh(&local->filter_lock);
1106         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1107 }
1108 
1109 /*
1110  * Called when the netdev is removed or, by the code below, before
1111  * the interface type changes.
1112  */
1113 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1114 {
1115         int i;
1116 
1117         /* free extra data */
1118         ieee80211_free_keys(sdata, false);
1119 
1120         ieee80211_debugfs_remove_netdev(sdata);
1121 
1122         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1123                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1124         sdata->fragment_next = 0;
1125 
1126         if (ieee80211_vif_is_mesh(&sdata->vif))
1127                 ieee80211_mesh_teardown_sdata(sdata);
1128 }
1129 
1130 static void ieee80211_uninit(struct net_device *dev)
1131 {
1132         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1133 }
1134 
1135 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1136                                          struct sk_buff *skb,
1137                                          struct net_device *sb_dev)
1138 {
1139         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1140 }
1141 
1142 static void
1143 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1144 {
1145         int i;
1146 
1147         for_each_possible_cpu(i) {
1148                 const struct pcpu_sw_netstats *tstats;
1149                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1150                 unsigned int start;
1151 
1152                 tstats = per_cpu_ptr(dev->tstats, i);
1153 
1154                 do {
1155                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1156                         rx_packets = tstats->rx_packets;
1157                         tx_packets = tstats->tx_packets;
1158                         rx_bytes = tstats->rx_bytes;
1159                         tx_bytes = tstats->tx_bytes;
1160                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1161 
1162                 stats->rx_packets += rx_packets;
1163                 stats->tx_packets += tx_packets;
1164                 stats->rx_bytes   += rx_bytes;
1165                 stats->tx_bytes   += tx_bytes;
1166         }
1167 }
1168 
1169 static const struct net_device_ops ieee80211_dataif_ops = {
1170         .ndo_open               = ieee80211_open,
1171         .ndo_stop               = ieee80211_stop,
1172         .ndo_uninit             = ieee80211_uninit,
1173         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1174         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1175         .ndo_set_mac_address    = ieee80211_change_mac,
1176         .ndo_select_queue       = ieee80211_netdev_select_queue,
1177         .ndo_get_stats64        = ieee80211_get_stats64,
1178 };
1179 
1180 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1181                                           struct sk_buff *skb,
1182                                           struct net_device *sb_dev)
1183 {
1184         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1185         struct ieee80211_local *local = sdata->local;
1186         struct ieee80211_hdr *hdr;
1187         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1188 
1189         if (local->hw.queues < IEEE80211_NUM_ACS)
1190                 return 0;
1191 
1192         if (skb->len < 4 ||
1193             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1194                 return 0; /* doesn't matter, frame will be dropped */
1195 
1196         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1197 
1198         return ieee80211_select_queue_80211(sdata, skb, hdr);
1199 }
1200 
1201 static const struct net_device_ops ieee80211_monitorif_ops = {
1202         .ndo_open               = ieee80211_open,
1203         .ndo_stop               = ieee80211_stop,
1204         .ndo_uninit             = ieee80211_uninit,
1205         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1206         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1207         .ndo_set_mac_address    = ieee80211_change_mac,
1208         .ndo_select_queue       = ieee80211_monitor_select_queue,
1209         .ndo_get_stats64        = ieee80211_get_stats64,
1210 };
1211 
1212 static const struct net_device_ops ieee80211_dataif_8023_ops = {
1213         .ndo_open               = ieee80211_open,
1214         .ndo_stop               = ieee80211_stop,
1215         .ndo_uninit             = ieee80211_uninit,
1216         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
1217         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1218         .ndo_set_mac_address    = ieee80211_change_mac,
1219         .ndo_select_queue       = ieee80211_netdev_select_queue,
1220         .ndo_get_stats64        = ieee80211_get_stats64,
1221 };
1222 
1223 static void __ieee80211_set_hw_80211_encap(struct ieee80211_sub_if_data *sdata,
1224                                            bool enable)
1225 {
1226         sdata->dev->netdev_ops = enable ? &ieee80211_dataif_8023_ops :
1227                                           &ieee80211_dataif_ops;
1228         sdata->hw_80211_encap = enable;
1229 }
1230 
1231 bool ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable)
1232 {
1233         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1234         struct ieee80211_local *local = sdata->local;
1235         struct ieee80211_sub_if_data *iter;
1236         struct ieee80211_key *key;
1237 
1238         mutex_lock(&local->iflist_mtx);
1239         list_for_each_entry(iter, &local->interfaces, list) {
1240                 struct ieee80211_sub_if_data *disable = NULL;
1241 
1242                 if (vif->type == NL80211_IFTYPE_MONITOR) {
1243                         disable = iter;
1244                         __ieee80211_set_hw_80211_encap(iter, false);
1245                 } else if (iter->vif.type == NL80211_IFTYPE_MONITOR) {
1246                         disable = sdata;
1247                         enable = false;
1248                 }
1249                 if (disable)
1250                         sdata_dbg(disable,
1251                                   "disable hw 80211 encap due to mon co-exist\n");
1252         }
1253         mutex_unlock(&local->iflist_mtx);
1254 
1255         if (enable == sdata->hw_80211_encap)
1256                 return enable;
1257 
1258         if (!sdata->dev)
1259                 return false;
1260 
1261         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1262             (local->hw.wiphy->frag_threshold != (u32)-1))
1263                 enable = false;
1264 
1265         mutex_lock(&sdata->local->key_mtx);
1266         list_for_each_entry(key, &sdata->key_list, list) {
1267                 if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
1268                         enable = false;
1269         }
1270         mutex_unlock(&sdata->local->key_mtx);
1271 
1272         __ieee80211_set_hw_80211_encap(sdata, enable);
1273 
1274         return enable;
1275 }
1276 EXPORT_SYMBOL(ieee80211_set_hw_80211_encap);
1277 
1278 static void ieee80211_if_free(struct net_device *dev)
1279 {
1280         free_percpu(dev->tstats);
1281 }
1282 
1283 static void ieee80211_if_setup(struct net_device *dev)
1284 {
1285         ether_setup(dev);
1286         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1287         dev->netdev_ops = &ieee80211_dataif_ops;
1288         dev->needs_free_netdev = true;
1289         dev->priv_destructor = ieee80211_if_free;
1290 }
1291 
1292 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1293 {
1294         ieee80211_if_setup(dev);
1295         dev->priv_flags |= IFF_NO_QUEUE;
1296 }
1297 
1298 static void ieee80211_iface_work(struct work_struct *work)
1299 {
1300         struct ieee80211_sub_if_data *sdata =
1301                 container_of(work, struct ieee80211_sub_if_data, work);
1302         struct ieee80211_local *local = sdata->local;
1303         struct sk_buff *skb;
1304         struct sta_info *sta;
1305 
1306         if (!ieee80211_sdata_running(sdata))
1307                 return;
1308 
1309         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1310                 return;
1311 
1312         if (!ieee80211_can_run_worker(local))
1313                 return;
1314 
1315         /* first process frames */
1316         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1317                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1318 
1319                 if (ieee80211_is_action(mgmt->frame_control) &&
1320                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1321                         int len = skb->len;
1322 
1323                         mutex_lock(&local->sta_mtx);
1324                         sta = sta_info_get_bss(sdata, mgmt->sa);
1325                         if (sta) {
1326                                 switch (mgmt->u.action.u.addba_req.action_code) {
1327                                 case WLAN_ACTION_ADDBA_REQ:
1328                                         ieee80211_process_addba_request(
1329                                                         local, sta, mgmt, len);
1330                                         break;
1331                                 case WLAN_ACTION_ADDBA_RESP:
1332                                         ieee80211_process_addba_resp(local, sta,
1333                                                                      mgmt, len);
1334                                         break;
1335                                 case WLAN_ACTION_DELBA:
1336                                         ieee80211_process_delba(sdata, sta,
1337                                                                 mgmt, len);
1338                                         break;
1339                                 default:
1340                                         WARN_ON(1);
1341                                         break;
1342                                 }
1343                         }
1344                         mutex_unlock(&local->sta_mtx);
1345                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1346                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1347                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1348                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1349                                 struct ieee80211_rx_status *status;
1350                                 enum nl80211_band band;
1351                                 u8 opmode;
1352 
1353                                 status = IEEE80211_SKB_RXCB(skb);
1354                                 band = status->band;
1355                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1356 
1357                                 mutex_lock(&local->sta_mtx);
1358                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1359 
1360                                 if (sta)
1361                                         ieee80211_vht_handle_opmode(sdata, sta,
1362                                                                     opmode,
1363                                                                     band);
1364 
1365                                 mutex_unlock(&local->sta_mtx);
1366                                 break;
1367                         }
1368                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1369                                 ieee80211_process_mu_groups(sdata, mgmt);
1370                                 break;
1371                         default:
1372                                 WARN_ON(1);
1373                                 break;
1374                         }
1375                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1376                         struct ieee80211_hdr *hdr = (void *)mgmt;
1377                         /*
1378                          * So the frame isn't mgmt, but frame_control
1379                          * is at the right place anyway, of course, so
1380                          * the if statement is correct.
1381                          *
1382                          * Warn if we have other data frame types here,
1383                          * they must not get here.
1384                          */
1385                         WARN_ON(hdr->frame_control &
1386                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1387                         WARN_ON(!(hdr->seq_ctrl &
1388                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1389                         /*
1390                          * This was a fragment of a frame, received while
1391                          * a block-ack session was active. That cannot be
1392                          * right, so terminate the session.
1393                          */
1394                         mutex_lock(&local->sta_mtx);
1395                         sta = sta_info_get_bss(sdata, mgmt->sa);
1396                         if (sta) {
1397                                 u16 tid = ieee80211_get_tid(hdr);
1398 
1399                                 __ieee80211_stop_rx_ba_session(
1400                                         sta, tid, WLAN_BACK_RECIPIENT,
1401                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1402                                         true);
1403                         }
1404                         mutex_unlock(&local->sta_mtx);
1405                 } else switch (sdata->vif.type) {
1406                 case NL80211_IFTYPE_STATION:
1407                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1408                         break;
1409                 case NL80211_IFTYPE_ADHOC:
1410                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1411                         break;
1412                 case NL80211_IFTYPE_MESH_POINT:
1413                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1414                                 break;
1415                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1416                         break;
1417                 default:
1418                         WARN(1, "frame for unexpected interface type");
1419                         break;
1420                 }
1421 
1422                 kfree_skb(skb);
1423         }
1424 
1425         /* then other type-dependent work */
1426         switch (sdata->vif.type) {
1427         case NL80211_IFTYPE_STATION:
1428                 ieee80211_sta_work(sdata);
1429                 break;
1430         case NL80211_IFTYPE_ADHOC:
1431                 ieee80211_ibss_work(sdata);
1432                 break;
1433         case NL80211_IFTYPE_MESH_POINT:
1434                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1435                         break;
1436                 ieee80211_mesh_work(sdata);
1437                 break;
1438         case NL80211_IFTYPE_OCB:
1439                 ieee80211_ocb_work(sdata);
1440                 break;
1441         default:
1442                 break;
1443         }
1444 }
1445 
1446 static void ieee80211_recalc_smps_work(struct work_struct *work)
1447 {
1448         struct ieee80211_sub_if_data *sdata =
1449                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1450 
1451         ieee80211_recalc_smps(sdata);
1452 }
1453 
1454 /*
1455  * Helper function to initialise an interface to a specific type.
1456  */
1457 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1458                                   enum nl80211_iftype type)
1459 {
1460         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1461                                                     0xff, 0xff, 0xff};
1462 
1463         /* clear type-dependent union */
1464         memset(&sdata->u, 0, sizeof(sdata->u));
1465 
1466         /* and set some type-dependent values */
1467         sdata->vif.type = type;
1468         sdata->vif.p2p = false;
1469         sdata->wdev.iftype = type;
1470 
1471         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1472         sdata->control_port_no_encrypt = false;
1473         sdata->control_port_over_nl80211 = false;
1474         sdata->control_port_no_preauth = false;
1475         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1476         sdata->vif.bss_conf.idle = true;
1477         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1478 
1479         sdata->noack_map = 0;
1480         sdata->hw_80211_encap = false;
1481 
1482         /* only monitor/p2p-device differ */
1483         if (sdata->dev) {
1484                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1485                 sdata->dev->type = ARPHRD_ETHER;
1486         }
1487 
1488         skb_queue_head_init(&sdata->skb_queue);
1489         INIT_WORK(&sdata->work, ieee80211_iface_work);
1490         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1491         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1492         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1493         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1494 
1495         switch (type) {
1496         case NL80211_IFTYPE_P2P_GO:
1497                 type = NL80211_IFTYPE_AP;
1498                 sdata->vif.type = type;
1499                 sdata->vif.p2p = true;
1500                 /* fall through */
1501         case NL80211_IFTYPE_AP:
1502                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1503                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1504                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1505                 break;
1506         case NL80211_IFTYPE_P2P_CLIENT:
1507                 type = NL80211_IFTYPE_STATION;
1508                 sdata->vif.type = type;
1509                 sdata->vif.p2p = true;
1510                 /* fall through */
1511         case NL80211_IFTYPE_STATION:
1512                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1513                 ieee80211_sta_setup_sdata(sdata);
1514                 break;
1515         case NL80211_IFTYPE_OCB:
1516                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1517                 ieee80211_ocb_setup_sdata(sdata);
1518                 break;
1519         case NL80211_IFTYPE_ADHOC:
1520                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1521                 ieee80211_ibss_setup_sdata(sdata);
1522                 break;
1523         case NL80211_IFTYPE_MESH_POINT:
1524                 if (ieee80211_vif_is_mesh(&sdata->vif))
1525                         ieee80211_mesh_init_sdata(sdata);
1526                 break;
1527         case NL80211_IFTYPE_MONITOR:
1528                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1529                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1530                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1531                                       MONITOR_FLAG_OTHER_BSS;
1532                 break;
1533         case NL80211_IFTYPE_WDS:
1534                 sdata->vif.bss_conf.bssid = NULL;
1535                 break;
1536         case NL80211_IFTYPE_NAN:
1537                 idr_init(&sdata->u.nan.function_inst_ids);
1538                 spin_lock_init(&sdata->u.nan.func_lock);
1539                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1540                 break;
1541         case NL80211_IFTYPE_AP_VLAN:
1542         case NL80211_IFTYPE_P2P_DEVICE:
1543                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1544                 break;
1545         case NL80211_IFTYPE_UNSPECIFIED:
1546         case NUM_NL80211_IFTYPES:
1547                 WARN_ON(1);
1548                 break;
1549         }
1550 
1551         ieee80211_debugfs_add_netdev(sdata);
1552 }
1553 
1554 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1555                                            enum nl80211_iftype type)
1556 {
1557         struct ieee80211_local *local = sdata->local;
1558         int ret, err;
1559         enum nl80211_iftype internal_type = type;
1560         bool p2p = false;
1561 
1562         ASSERT_RTNL();
1563 
1564         if (!local->ops->change_interface)
1565                 return -EBUSY;
1566 
1567         switch (sdata->vif.type) {
1568         case NL80211_IFTYPE_AP:
1569         case NL80211_IFTYPE_STATION:
1570         case NL80211_IFTYPE_ADHOC:
1571         case NL80211_IFTYPE_OCB:
1572                 /*
1573                  * Could maybe also all others here?
1574                  * Just not sure how that interacts
1575                  * with the RX/config path e.g. for
1576                  * mesh.
1577                  */
1578                 break;
1579         default:
1580                 return -EBUSY;
1581         }
1582 
1583         switch (type) {
1584         case NL80211_IFTYPE_AP:
1585         case NL80211_IFTYPE_STATION:
1586         case NL80211_IFTYPE_ADHOC:
1587         case NL80211_IFTYPE_OCB:
1588                 /*
1589                  * Could probably support everything
1590                  * but WDS here (WDS do_open can fail
1591                  * under memory pressure, which this
1592                  * code isn't prepared to handle).
1593                  */
1594                 break;
1595         case NL80211_IFTYPE_P2P_CLIENT:
1596                 p2p = true;
1597                 internal_type = NL80211_IFTYPE_STATION;
1598                 break;
1599         case NL80211_IFTYPE_P2P_GO:
1600                 p2p = true;
1601                 internal_type = NL80211_IFTYPE_AP;
1602                 break;
1603         default:
1604                 return -EBUSY;
1605         }
1606 
1607         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1608         if (ret)
1609                 return ret;
1610 
1611         ieee80211_do_stop(sdata, false);
1612 
1613         ieee80211_teardown_sdata(sdata);
1614 
1615         ret = drv_change_interface(local, sdata, internal_type, p2p);
1616         if (ret)
1617                 type = ieee80211_vif_type_p2p(&sdata->vif);
1618 
1619         /*
1620          * Ignore return value here, there's not much we can do since
1621          * the driver changed the interface type internally already.
1622          * The warnings will hopefully make driver authors fix it :-)
1623          */
1624         ieee80211_check_queues(sdata, type);
1625 
1626         ieee80211_setup_sdata(sdata, type);
1627 
1628         err = ieee80211_do_open(&sdata->wdev, false);
1629         WARN(err, "type change: do_open returned %d", err);
1630 
1631         return ret;
1632 }
1633 
1634 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1635                              enum nl80211_iftype type)
1636 {
1637         int ret;
1638 
1639         ASSERT_RTNL();
1640 
1641         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1642                 return 0;
1643 
1644         if (ieee80211_sdata_running(sdata)) {
1645                 ret = ieee80211_runtime_change_iftype(sdata, type);
1646                 if (ret)
1647                         return ret;
1648         } else {
1649                 /* Purge and reset type-dependent state. */
1650                 ieee80211_teardown_sdata(sdata);
1651                 ieee80211_setup_sdata(sdata, type);
1652         }
1653 
1654         /* reset some values that shouldn't be kept across type changes */
1655         if (type == NL80211_IFTYPE_STATION)
1656                 sdata->u.mgd.use_4addr = false;
1657 
1658         return 0;
1659 }
1660 
1661 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1662                                        u8 *perm_addr, enum nl80211_iftype type)
1663 {
1664         struct ieee80211_sub_if_data *sdata;
1665         u64 mask, start, addr, val, inc;
1666         u8 *m;
1667         u8 tmp_addr[ETH_ALEN];
1668         int i;
1669 
1670         /* default ... something at least */
1671         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1672 
1673         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1674             local->hw.wiphy->n_addresses <= 1)
1675                 return;
1676 
1677         mutex_lock(&local->iflist_mtx);
1678 
1679         switch (type) {
1680         case NL80211_IFTYPE_MONITOR:
1681                 /* doesn't matter */
1682                 break;
1683         case NL80211_IFTYPE_WDS:
1684         case NL80211_IFTYPE_AP_VLAN:
1685                 /* match up with an AP interface */
1686                 list_for_each_entry(sdata, &local->interfaces, list) {
1687                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1688                                 continue;
1689                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1690                         break;
1691                 }
1692                 /* keep default if no AP interface present */
1693                 break;
1694         case NL80211_IFTYPE_P2P_CLIENT:
1695         case NL80211_IFTYPE_P2P_GO:
1696                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1697                         list_for_each_entry(sdata, &local->interfaces, list) {
1698                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1699                                         continue;
1700                                 if (!ieee80211_sdata_running(sdata))
1701                                         continue;
1702                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1703                                 goto out_unlock;
1704                         }
1705                 }
1706                 /* fall through */
1707         default:
1708                 /* assign a new address if possible -- try n_addresses first */
1709                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1710                         bool used = false;
1711 
1712                         list_for_each_entry(sdata, &local->interfaces, list) {
1713                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1714                                                      sdata->vif.addr)) {
1715                                         used = true;
1716                                         break;
1717                                 }
1718                         }
1719 
1720                         if (!used) {
1721                                 memcpy(perm_addr,
1722                                        local->hw.wiphy->addresses[i].addr,
1723                                        ETH_ALEN);
1724                                 break;
1725                         }
1726                 }
1727 
1728                 /* try mask if available */
1729                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1730                         break;
1731 
1732                 m = local->hw.wiphy->addr_mask;
1733                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1734                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1735                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1736 
1737                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1738                         /* not a contiguous mask ... not handled now! */
1739                         pr_info("not contiguous\n");
1740                         break;
1741                 }
1742 
1743                 /*
1744                  * Pick address of existing interface in case user changed
1745                  * MAC address manually, default to perm_addr.
1746                  */
1747                 m = local->hw.wiphy->perm_addr;
1748                 list_for_each_entry(sdata, &local->interfaces, list) {
1749                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1750                                 continue;
1751                         m = sdata->vif.addr;
1752                         break;
1753                 }
1754                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1755                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1756                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1757 
1758                 inc = 1ULL<<__ffs64(mask);
1759                 val = (start & mask);
1760                 addr = (start & ~mask) | (val & mask);
1761                 do {
1762                         bool used = false;
1763 
1764                         tmp_addr[5] = addr >> 0*8;
1765                         tmp_addr[4] = addr >> 1*8;
1766                         tmp_addr[3] = addr >> 2*8;
1767                         tmp_addr[2] = addr >> 3*8;
1768                         tmp_addr[1] = addr >> 4*8;
1769                         tmp_addr[0] = addr >> 5*8;
1770 
1771                         val += inc;
1772 
1773                         list_for_each_entry(sdata, &local->interfaces, list) {
1774                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1775                                         used = true;
1776                                         break;
1777                                 }
1778                         }
1779 
1780                         if (!used) {
1781                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1782                                 break;
1783                         }
1784                         addr = (start & ~mask) | (val & mask);
1785                 } while (addr != start);
1786 
1787                 break;
1788         }
1789 
1790  out_unlock:
1791         mutex_unlock(&local->iflist_mtx);
1792 }
1793 
1794 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1795                      unsigned char name_assign_type,
1796                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1797                      struct vif_params *params)
1798 {
1799         struct net_device *ndev = NULL;
1800         struct ieee80211_sub_if_data *sdata = NULL;
1801         struct txq_info *txqi;
1802         void (*if_setup)(struct net_device *dev);
1803         int ret, i;
1804         int txqs = 1;
1805 
1806         ASSERT_RTNL();
1807 
1808         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1809                 struct wireless_dev *wdev;
1810 
1811                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1812                                 GFP_KERNEL);
1813                 if (!sdata)
1814                         return -ENOMEM;
1815                 wdev = &sdata->wdev;
1816 
1817                 sdata->dev = NULL;
1818                 strlcpy(sdata->name, name, IFNAMSIZ);
1819                 ieee80211_assign_perm_addr(local, wdev->address, type);
1820                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1821         } else {
1822                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1823                                  sizeof(void *));
1824                 int txq_size = 0;
1825 
1826                 if (local->ops->wake_tx_queue &&
1827                     type != NL80211_IFTYPE_AP_VLAN &&
1828                     (type != NL80211_IFTYPE_MONITOR ||
1829                      (params->flags & MONITOR_FLAG_ACTIVE)))
1830                         txq_size += sizeof(struct txq_info) +
1831                                     local->hw.txq_data_size;
1832 
1833                 if (local->ops->wake_tx_queue) {
1834                         if_setup = ieee80211_if_setup_no_queue;
1835                 } else {
1836                         if_setup = ieee80211_if_setup;
1837                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1838                                 txqs = IEEE80211_NUM_ACS;
1839                 }
1840 
1841                 ndev = alloc_netdev_mqs(size + txq_size,
1842                                         name, name_assign_type,
1843                                         if_setup, txqs, 1);
1844                 if (!ndev)
1845                         return -ENOMEM;
1846 
1847                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1848                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1849 
1850                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1851 
1852                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1853                 if (!ndev->tstats) {
1854                         free_netdev(ndev);
1855                         return -ENOMEM;
1856                 }
1857 
1858                 ndev->needed_headroom = local->tx_headroom +
1859                                         4*6 /* four MAC addresses */
1860                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1861                                         + 6 /* mesh */
1862                                         + 8 /* rfc1042/bridge tunnel */
1863                                         - ETH_HLEN /* ethernet hard_header_len */
1864                                         + IEEE80211_ENCRYPT_HEADROOM;
1865                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1866 
1867                 ret = dev_alloc_name(ndev, ndev->name);
1868                 if (ret < 0) {
1869                         ieee80211_if_free(ndev);
1870                         free_netdev(ndev);
1871                         return ret;
1872                 }
1873 
1874                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1875                 if (is_valid_ether_addr(params->macaddr))
1876                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1877                 else
1878                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1879                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1880 
1881                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1882                 sdata = netdev_priv(ndev);
1883                 ndev->ieee80211_ptr = &sdata->wdev;
1884                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1885                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1886 
1887                 if (txq_size) {
1888                         txqi = netdev_priv(ndev) + size;
1889                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1890                 }
1891 
1892                 sdata->dev = ndev;
1893         }
1894 
1895         /* initialise type-independent data */
1896         sdata->wdev.wiphy = local->hw.wiphy;
1897         sdata->local = local;
1898 
1899         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1900                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1901 
1902         INIT_LIST_HEAD(&sdata->key_list);
1903 
1904         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1905                           ieee80211_dfs_cac_timer_work);
1906         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1907                           ieee80211_delayed_tailroom_dec);
1908 
1909         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1910                 struct ieee80211_supported_band *sband;
1911                 sband = local->hw.wiphy->bands[i];
1912                 sdata->rc_rateidx_mask[i] =
1913                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1914                 if (sband) {
1915                         __le16 cap;
1916                         u16 *vht_rate_mask;
1917 
1918                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1919                                sband->ht_cap.mcs.rx_mask,
1920                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1921 
1922                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1923                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1924                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1925                 } else {
1926                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1927                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1928                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1929                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1930                 }
1931         }
1932 
1933         ieee80211_set_default_queues(sdata);
1934 
1935         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1936         sdata->user_power_level = local->user_power_level;
1937 
1938         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1939 
1940         /* setup type-dependent data */
1941         ieee80211_setup_sdata(sdata, type);
1942 
1943         if (ndev) {
1944                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1945                 if (type == NL80211_IFTYPE_STATION)
1946                         sdata->u.mgd.use_4addr = params->use_4addr;
1947 
1948                 ndev->features |= local->hw.netdev_features;
1949                 ndev->hw_features |= ndev->features &
1950                                         MAC80211_SUPPORTED_FEATURES_TX;
1951 
1952                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1953 
1954                 /* MTU range: 256 - 2304 */
1955                 ndev->min_mtu = 256;
1956                 ndev->max_mtu = local->hw.max_mtu;
1957 
1958                 ret = register_netdevice(ndev);
1959                 if (ret) {
1960                         free_netdev(ndev);
1961                         return ret;
1962                 }
1963         }
1964 
1965         mutex_lock(&local->iflist_mtx);
1966         list_add_tail_rcu(&sdata->list, &local->interfaces);
1967         mutex_unlock(&local->iflist_mtx);
1968 
1969         if (new_wdev)
1970                 *new_wdev = &sdata->wdev;
1971 
1972         return 0;
1973 }
1974 
1975 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1976 {
1977         ASSERT_RTNL();
1978 
1979         mutex_lock(&sdata->local->iflist_mtx);
1980         list_del_rcu(&sdata->list);
1981         mutex_unlock(&sdata->local->iflist_mtx);
1982 
1983         if (sdata->vif.txq)
1984                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1985 
1986         synchronize_rcu();
1987 
1988         if (sdata->dev) {
1989                 unregister_netdevice(sdata->dev);
1990         } else {
1991                 cfg80211_unregister_wdev(&sdata->wdev);
1992                 ieee80211_teardown_sdata(sdata);
1993                 kfree(sdata);
1994         }
1995 }
1996 
1997 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1998 {
1999         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2000                 return;
2001         ieee80211_do_stop(sdata, true);
2002 }
2003 
2004 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2005 {
2006         struct ieee80211_sub_if_data *sdata, *tmp;
2007         LIST_HEAD(unreg_list);
2008         LIST_HEAD(wdev_list);
2009 
2010         ASSERT_RTNL();
2011 
2012         /* Before destroying the interfaces, make sure they're all stopped so
2013          * that the hardware is stopped. Otherwise, the driver might still be
2014          * iterating the interfaces during the shutdown, e.g. from a worker
2015          * or from RX processing or similar, and if it does so (using atomic
2016          * iteration) while we're manipulating the list, the iteration will
2017          * crash.
2018          *
2019          * After this, the hardware should be stopped and the driver should
2020          * have stopped all of its activities, so that we can do RCU-unaware
2021          * manipulations of the interface list below.
2022          */
2023         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2024 
2025         WARN(local->open_count, "%s: open count remains %d\n",
2026              wiphy_name(local->hw.wiphy), local->open_count);
2027 
2028         ieee80211_txq_teardown_flows(local);
2029 
2030         mutex_lock(&local->iflist_mtx);
2031         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2032                 list_del(&sdata->list);
2033 
2034                 if (sdata->dev)
2035                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2036                 else
2037                         list_add(&sdata->list, &wdev_list);
2038         }
2039         mutex_unlock(&local->iflist_mtx);
2040         unregister_netdevice_many(&unreg_list);
2041 
2042         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2043                 list_del(&sdata->list);
2044                 cfg80211_unregister_wdev(&sdata->wdev);
2045                 kfree(sdata);
2046         }
2047 }
2048 
2049 static int netdev_notify(struct notifier_block *nb,
2050                          unsigned long state, void *ptr)
2051 {
2052         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2053         struct ieee80211_sub_if_data *sdata;
2054 
2055         if (state != NETDEV_CHANGENAME)
2056                 return NOTIFY_DONE;
2057 
2058         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2059                 return NOTIFY_DONE;
2060 
2061         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2062                 return NOTIFY_DONE;
2063 
2064         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2065         memcpy(sdata->name, dev->name, IFNAMSIZ);
2066         ieee80211_debugfs_rename_netdev(sdata);
2067 
2068         return NOTIFY_OK;
2069 }
2070 
2071 static struct notifier_block mac80211_netdev_notifier = {
2072         .notifier_call = netdev_notify,
2073 };
2074 
2075 int ieee80211_iface_init(void)
2076 {
2077         return register_netdevice_notifier(&mac80211_netdev_notifier);
2078 }
2079 
2080 void ieee80211_iface_exit(void)
2081 {
2082         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2083 }
2084 
2085 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2086 {
2087         if (sdata->vif.type == NL80211_IFTYPE_AP)
2088                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2089         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2090                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2091 }
2092 
2093 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2094 {
2095         if (sdata->vif.type == NL80211_IFTYPE_AP)
2096                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2097         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2098                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2099 }
2100 

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