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

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  1 /*
  2  * Interface handling
  3  *
  4  * Copyright 2002-2005, Instant802 Networks, Inc.
  5  * Copyright 2005-2006, Devicescape Software, Inc.
  6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 46 {
 47         struct ieee80211_chanctx_conf *chanctx_conf;
 48         int power;
 49 
 50         rcu_read_lock();
 51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 52         if (!chanctx_conf) {
 53                 rcu_read_unlock();
 54                 return false;
 55         }
 56 
 57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 58         rcu_read_unlock();
 59 
 60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 61                 power = min(power, sdata->user_power_level);
 62 
 63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 64                 power = min(power, sdata->ap_power_level);
 65 
 66         if (power != sdata->vif.bss_conf.txpower) {
 67                 sdata->vif.bss_conf.txpower = power;
 68                 ieee80211_hw_config(sdata->local, 0);
 69                 return true;
 70         }
 71 
 72         return false;
 73 }
 74 
 75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 76 {
 77         if (__ieee80211_recalc_txpower(sdata))
 78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 79 }
 80 
 81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 82 {
 83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 84                 return 0;
 85 
 86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 87         return IEEE80211_CONF_CHANGE_IDLE;
 88 }
 89 
 90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 91 {
 92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
 93                 return 0;
 94 
 95         ieee80211_flush_queues(local, NULL);
 96 
 97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 98         return IEEE80211_CONF_CHANGE_IDLE;
 99 }
100 
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102                                    bool force_active)
103 {
104         bool working = false, scanning, active;
105         unsigned int led_trig_start = 0, led_trig_stop = 0;
106         struct ieee80211_roc_work *roc;
107 
108         lockdep_assert_held(&local->mtx);
109 
110         active = force_active ||
111                  !list_empty(&local->chanctx_list) ||
112                  local->monitors;
113 
114         if (!local->ops->remain_on_channel) {
115                 list_for_each_entry(roc, &local->roc_list, list) {
116                         working = true;
117                         break;
118                 }
119         }
120 
121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123 
124         if (working || scanning)
125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126         else
127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128 
129         if (active)
130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131         else
132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133 
134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135 
136         if (working || scanning || active)
137                 return __ieee80211_idle_off(local);
138         return __ieee80211_idle_on(local);
139 }
140 
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143         return __ieee80211_recalc_idle(local, true);
144 }
145 
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148         u32 change = __ieee80211_recalc_idle(local, false);
149         if (change)
150                 ieee80211_hw_config(local, change);
151 }
152 
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156                 return -EINVAL;
157 
158         dev->mtu = new_mtu;
159         return 0;
160 }
161 
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163                                 bool check_dup)
164 {
165         struct ieee80211_local *local = sdata->local;
166         struct ieee80211_sub_if_data *iter;
167         u64 new, mask, tmp;
168         u8 *m;
169         int ret = 0;
170 
171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172                 return 0;
173 
174         m = addr;
175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178 
179         m = local->hw.wiphy->addr_mask;
180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183 
184         if (!check_dup)
185                 return ret;
186 
187         mutex_lock(&local->iflist_mtx);
188         list_for_each_entry(iter, &local->interfaces, list) {
189                 if (iter == sdata)
190                         continue;
191 
192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
194                         continue;
195 
196                 m = iter->vif.addr;
197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200 
201                 if ((new & ~mask) != (tmp & ~mask)) {
202                         ret = -EINVAL;
203                         break;
204                 }
205         }
206         mutex_unlock(&local->iflist_mtx);
207 
208         return ret;
209 }
210 
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214         struct sockaddr *sa = addr;
215         bool check_dup = true;
216         int ret;
217 
218         if (ieee80211_sdata_running(sdata))
219                 return -EBUSY;
220 
221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
223                 check_dup = false;
224 
225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226         if (ret)
227                 return ret;
228 
229         ret = eth_mac_addr(dev, sa);
230 
231         if (ret == 0)
232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233 
234         return ret;
235 }
236 
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239         return type1 == NL80211_IFTYPE_MONITOR ||
240                 type2 == NL80211_IFTYPE_MONITOR ||
241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244                 (type1 == NL80211_IFTYPE_WDS &&
245                         (type2 == NL80211_IFTYPE_WDS ||
246                          type2 == NL80211_IFTYPE_AP)) ||
247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
249                         (type2 == NL80211_IFTYPE_AP ||
250                          type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252 
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254                                             enum nl80211_iftype iftype)
255 {
256         struct ieee80211_local *local = sdata->local;
257         struct ieee80211_sub_if_data *nsdata;
258 
259         ASSERT_RTNL();
260 
261         /* we hold the RTNL here so can safely walk the list */
262         list_for_each_entry(nsdata, &local->interfaces, list) {
263                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
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         return 0;
309 }
310 
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312                                   enum nl80211_iftype iftype)
313 {
314         int n_queues = sdata->local->hw.queues;
315         int i;
316 
317         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320                                          IEEE80211_INVAL_HW_QUEUE))
321                                 return -EINVAL;
322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323                                          n_queues))
324                                 return -EINVAL;
325                 }
326         }
327 
328         if ((iftype != NL80211_IFTYPE_AP &&
329              iftype != NL80211_IFTYPE_P2P_GO &&
330              iftype != NL80211_IFTYPE_MESH_POINT) ||
331             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333                 return 0;
334         }
335 
336         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337                 return -EINVAL;
338 
339         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340                 return -EINVAL;
341 
342         return 0;
343 }
344 
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346                                     const int offset)
347 {
348         struct ieee80211_local *local = sdata->local;
349         u32 flags = sdata->u.mntr_flags;
350 
351 #define ADJUST(_f, _s)  do {                                    \
352         if (flags & MONITOR_FLAG_##_f)                          \
353                 local->fif_##_s += offset;                      \
354         } while (0)
355 
356         ADJUST(FCSFAIL, fcsfail);
357         ADJUST(PLCPFAIL, plcpfail);
358         ADJUST(CONTROL, control);
359         ADJUST(CONTROL, pspoll);
360         ADJUST(OTHER_BSS, other_bss);
361 
362 #undef ADJUST
363 }
364 
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367         struct ieee80211_local *local = sdata->local;
368         int i;
369 
370         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374                         sdata->vif.hw_queue[i] = i;
375                 else
376                         sdata->vif.hw_queue[i] = 0;
377         }
378         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380 
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383         struct ieee80211_sub_if_data *sdata;
384         int ret;
385 
386         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387                 return 0;
388 
389         ASSERT_RTNL();
390 
391         if (local->monitor_sdata)
392                 return 0;
393 
394         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395         if (!sdata)
396                 return -ENOMEM;
397 
398         /* set up data */
399         sdata->local = local;
400         sdata->vif.type = NL80211_IFTYPE_MONITOR;
401         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402                  wiphy_name(local->hw.wiphy));
403 
404         ieee80211_set_default_queues(sdata);
405 
406         ret = drv_add_interface(local, sdata);
407         if (WARN_ON(ret)) {
408                 /* ok .. stupid driver, it asked for this! */
409                 kfree(sdata);
410                 return ret;
411         }
412 
413         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
414         if (ret) {
415                 kfree(sdata);
416                 return ret;
417         }
418 
419         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
420                                         IEEE80211_CHANCTX_EXCLUSIVE);
421         if (ret) {
422                 drv_remove_interface(local, sdata);
423                 kfree(sdata);
424                 return ret;
425         }
426 
427         mutex_lock(&local->iflist_mtx);
428         rcu_assign_pointer(local->monitor_sdata, sdata);
429         mutex_unlock(&local->iflist_mtx);
430 
431         return 0;
432 }
433 
434 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
435 {
436         struct ieee80211_sub_if_data *sdata;
437 
438         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
439                 return;
440 
441         ASSERT_RTNL();
442 
443         mutex_lock(&local->iflist_mtx);
444 
445         sdata = rcu_dereference_protected(local->monitor_sdata,
446                                           lockdep_is_held(&local->iflist_mtx));
447         if (!sdata) {
448                 mutex_unlock(&local->iflist_mtx);
449                 return;
450         }
451 
452         rcu_assign_pointer(local->monitor_sdata, NULL);
453         mutex_unlock(&local->iflist_mtx);
454 
455         synchronize_net();
456 
457         ieee80211_vif_release_channel(sdata);
458 
459         drv_remove_interface(local, sdata);
460 
461         kfree(sdata);
462 }
463 
464 /*
465  * NOTE: Be very careful when changing this function, it must NOT return
466  * an error on interface type changes that have been pre-checked, so most
467  * checks should be in ieee80211_check_concurrent_iface.
468  */
469 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
470 {
471         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
472         struct net_device *dev = wdev->netdev;
473         struct ieee80211_local *local = sdata->local;
474         struct sta_info *sta;
475         u32 changed = 0;
476         int res;
477         u32 hw_reconf_flags = 0;
478 
479         switch (sdata->vif.type) {
480         case NL80211_IFTYPE_WDS:
481                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
482                         return -ENOLINK;
483                 break;
484         case NL80211_IFTYPE_AP_VLAN: {
485                 struct ieee80211_sub_if_data *master;
486 
487                 if (!sdata->bss)
488                         return -ENOLINK;
489 
490                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
491 
492                 master = container_of(sdata->bss,
493                                       struct ieee80211_sub_if_data, u.ap);
494                 sdata->control_port_protocol =
495                         master->control_port_protocol;
496                 sdata->control_port_no_encrypt =
497                         master->control_port_no_encrypt;
498                 sdata->vif.cab_queue = master->vif.cab_queue;
499                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
500                        sizeof(sdata->vif.hw_queue));
501                 break;
502                 }
503         case NL80211_IFTYPE_AP:
504                 sdata->bss = &sdata->u.ap;
505                 break;
506         case NL80211_IFTYPE_MESH_POINT:
507         case NL80211_IFTYPE_STATION:
508         case NL80211_IFTYPE_MONITOR:
509         case NL80211_IFTYPE_ADHOC:
510         case NL80211_IFTYPE_P2P_DEVICE:
511                 /* no special treatment */
512                 break;
513         case NL80211_IFTYPE_UNSPECIFIED:
514         case NUM_NL80211_IFTYPES:
515         case NL80211_IFTYPE_P2P_CLIENT:
516         case NL80211_IFTYPE_P2P_GO:
517                 /* cannot happen */
518                 WARN_ON(1);
519                 break;
520         }
521 
522         if (local->open_count == 0) {
523                 res = drv_start(local);
524                 if (res)
525                         goto err_del_bss;
526                 /* we're brought up, everything changes */
527                 hw_reconf_flags = ~0;
528                 ieee80211_led_radio(local, true);
529                 ieee80211_mod_tpt_led_trig(local,
530                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
531         }
532 
533         /*
534          * Copy the hopefully now-present MAC address to
535          * this interface, if it has the special null one.
536          */
537         if (dev && is_zero_ether_addr(dev->dev_addr)) {
538                 memcpy(dev->dev_addr,
539                        local->hw.wiphy->perm_addr,
540                        ETH_ALEN);
541                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
542 
543                 if (!is_valid_ether_addr(dev->dev_addr)) {
544                         res = -EADDRNOTAVAIL;
545                         goto err_stop;
546                 }
547         }
548 
549         switch (sdata->vif.type) {
550         case NL80211_IFTYPE_AP_VLAN:
551                 /* no need to tell driver, but set carrier and chanctx */
552                 if (rtnl_dereference(sdata->bss->beacon)) {
553                         ieee80211_vif_vlan_copy_chanctx(sdata);
554                         netif_carrier_on(dev);
555                 } else {
556                         netif_carrier_off(dev);
557                 }
558                 break;
559         case NL80211_IFTYPE_MONITOR:
560                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
561                         local->cooked_mntrs++;
562                         break;
563                 }
564 
565                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
566                         res = drv_add_interface(local, sdata);
567                         if (res)
568                                 goto err_stop;
569                 } else if (local->monitors == 0 && local->open_count == 0) {
570                         res = ieee80211_add_virtual_monitor(local);
571                         if (res)
572                                 goto err_stop;
573                 }
574 
575                 /* must be before the call to ieee80211_configure_filter */
576                 local->monitors++;
577                 if (local->monitors == 1) {
578                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
579                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
580                 }
581 
582                 ieee80211_adjust_monitor_flags(sdata, 1);
583                 ieee80211_configure_filter(local);
584                 mutex_lock(&local->mtx);
585                 ieee80211_recalc_idle(local);
586                 mutex_unlock(&local->mtx);
587 
588                 netif_carrier_on(dev);
589                 break;
590         default:
591                 if (coming_up) {
592                         ieee80211_del_virtual_monitor(local);
593 
594                         res = drv_add_interface(local, sdata);
595                         if (res)
596                                 goto err_stop;
597                         res = ieee80211_check_queues(sdata,
598                                 ieee80211_vif_type_p2p(&sdata->vif));
599                         if (res)
600                                 goto err_del_interface;
601                 }
602 
603                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
604                         local->fif_pspoll++;
605                         local->fif_probe_req++;
606 
607                         ieee80211_configure_filter(local);
608                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
609                         local->fif_probe_req++;
610                 }
611 
612                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
613                         changed |= ieee80211_reset_erp_info(sdata);
614                 ieee80211_bss_info_change_notify(sdata, changed);
615 
616                 switch (sdata->vif.type) {
617                 case NL80211_IFTYPE_STATION:
618                 case NL80211_IFTYPE_ADHOC:
619                 case NL80211_IFTYPE_AP:
620                 case NL80211_IFTYPE_MESH_POINT:
621                         netif_carrier_off(dev);
622                         break;
623                 case NL80211_IFTYPE_WDS:
624                 case NL80211_IFTYPE_P2P_DEVICE:
625                         break;
626                 default:
627                         /* not reached */
628                         WARN_ON(1);
629                 }
630 
631                 /*
632                  * set default queue parameters so drivers don't
633                  * need to initialise the hardware if the hardware
634                  * doesn't start up with sane defaults
635                  */
636                 ieee80211_set_wmm_default(sdata, true);
637         }
638 
639         set_bit(SDATA_STATE_RUNNING, &sdata->state);
640 
641         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
642                 /* Create STA entry for the WDS peer */
643                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
644                                      GFP_KERNEL);
645                 if (!sta) {
646                         res = -ENOMEM;
647                         goto err_del_interface;
648                 }
649 
650                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
651                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
652                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
653 
654                 res = sta_info_insert(sta);
655                 if (res) {
656                         /* STA has been freed */
657                         goto err_del_interface;
658                 }
659 
660                 rate_control_rate_init(sta);
661                 netif_carrier_on(dev);
662         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
663                 rcu_assign_pointer(local->p2p_sdata, sdata);
664         }
665 
666         /*
667          * set_multicast_list will be invoked by the networking core
668          * which will check whether any increments here were done in
669          * error and sync them down to the hardware as filter flags.
670          */
671         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
672                 atomic_inc(&local->iff_allmultis);
673 
674         if (sdata->flags & IEEE80211_SDATA_PROMISC)
675                 atomic_inc(&local->iff_promiscs);
676 
677         if (coming_up)
678                 local->open_count++;
679 
680         if (hw_reconf_flags)
681                 ieee80211_hw_config(local, hw_reconf_flags);
682 
683         ieee80211_recalc_ps(local, -1);
684 
685         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
686             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
687                 /* XXX: for AP_VLAN, actually track AP queues */
688                 netif_tx_start_all_queues(dev);
689         } else if (dev) {
690                 unsigned long flags;
691                 int n_acs = IEEE80211_NUM_ACS;
692                 int ac;
693 
694                 if (local->hw.queues < IEEE80211_NUM_ACS)
695                         n_acs = 1;
696 
697                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
698                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
699                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
700                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
701                         for (ac = 0; ac < n_acs; ac++) {
702                                 int ac_queue = sdata->vif.hw_queue[ac];
703 
704                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
705                                     skb_queue_empty(&local->pending[ac_queue]))
706                                         netif_start_subqueue(dev, ac);
707                         }
708                 }
709                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
710         }
711 
712         return 0;
713  err_del_interface:
714         drv_remove_interface(local, sdata);
715  err_stop:
716         if (!local->open_count)
717                 drv_stop(local);
718  err_del_bss:
719         sdata->bss = NULL;
720         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
721                 list_del(&sdata->u.vlan.list);
722         /* might already be clear but that doesn't matter */
723         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
724         return res;
725 }
726 
727 static int ieee80211_open(struct net_device *dev)
728 {
729         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
730         int err;
731 
732         /* fail early if user set an invalid address */
733         if (!is_valid_ether_addr(dev->dev_addr))
734                 return -EADDRNOTAVAIL;
735 
736         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
737         if (err)
738                 return err;
739 
740         return ieee80211_do_open(&sdata->wdev, true);
741 }
742 
743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
744                               bool going_down)
745 {
746         struct ieee80211_local *local = sdata->local;
747         unsigned long flags;
748         struct sk_buff *skb, *tmp;
749         u32 hw_reconf_flags = 0;
750         int i, flushed;
751         struct ps_data *ps;
752 
753         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
754 
755         if (rcu_access_pointer(local->scan_sdata) == sdata)
756                 ieee80211_scan_cancel(local);
757 
758         /*
759          * Stop TX on this interface first.
760          */
761         if (sdata->dev)
762                 netif_tx_stop_all_queues(sdata->dev);
763 
764         ieee80211_roc_purge(local, sdata);
765 
766         if (sdata->vif.type == NL80211_IFTYPE_STATION)
767                 ieee80211_mgd_stop(sdata);
768 
769         if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
770                 ieee80211_ibss_stop(sdata);
771 
772 
773         /*
774          * Remove all stations associated with this interface.
775          *
776          * This must be done before calling ops->remove_interface()
777          * because otherwise we can later invoke ops->sta_notify()
778          * whenever the STAs are removed, and that invalidates driver
779          * assumptions about always getting a vif pointer that is valid
780          * (because if we remove a STA after ops->remove_interface()
781          * the driver will have removed the vif info already!)
782          *
783          * This is relevant only in WDS mode, in all other modes we've
784          * already removed all stations when disconnecting or similar,
785          * so warn otherwise.
786          *
787          * We call sta_info_flush_cleanup() later, to combine RCU waits.
788          */
789         flushed = sta_info_flush_defer(sdata);
790         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
791                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
792 
793         /* don't count this interface for promisc/allmulti while it is down */
794         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
795                 atomic_dec(&local->iff_allmultis);
796 
797         if (sdata->flags & IEEE80211_SDATA_PROMISC)
798                 atomic_dec(&local->iff_promiscs);
799 
800         if (sdata->vif.type == NL80211_IFTYPE_AP) {
801                 local->fif_pspoll--;
802                 local->fif_probe_req--;
803         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
804                 local->fif_probe_req--;
805         }
806 
807         if (sdata->dev) {
808                 netif_addr_lock_bh(sdata->dev);
809                 spin_lock_bh(&local->filter_lock);
810                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
811                                  sdata->dev->addr_len);
812                 spin_unlock_bh(&local->filter_lock);
813                 netif_addr_unlock_bh(sdata->dev);
814         }
815 
816         del_timer_sync(&local->dynamic_ps_timer);
817         cancel_work_sync(&local->dynamic_ps_enable_work);
818 
819         cancel_work_sync(&sdata->recalc_smps);
820         sdata->vif.csa_active = false;
821         cancel_work_sync(&sdata->csa_finalize_work);
822 
823         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
824 
825         if (sdata->wdev.cac_started) {
826                 WARN_ON(local->suspended);
827                 mutex_lock(&local->iflist_mtx);
828                 ieee80211_vif_release_channel(sdata);
829                 mutex_unlock(&local->iflist_mtx);
830                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
831                                    GFP_KERNEL);
832         }
833 
834         /* APs need special treatment */
835         if (sdata->vif.type == NL80211_IFTYPE_AP) {
836                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
837 
838                 /* down all dependent devices, that is VLANs */
839                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
840                                          u.vlan.list)
841                         dev_close(vlan->dev);
842                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
843         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
844                 /* remove all packets in parent bc_buf pointing to this dev */
845                 ps = &sdata->bss->ps;
846 
847                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
848                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
849                         if (skb->dev == sdata->dev) {
850                                 __skb_unlink(skb, &ps->bc_buf);
851                                 local->total_ps_buffered--;
852                                 ieee80211_free_txskb(&local->hw, skb);
853                         }
854                 }
855                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
856         }
857 
858         if (going_down)
859                 local->open_count--;
860 
861         switch (sdata->vif.type) {
862         case NL80211_IFTYPE_AP_VLAN:
863                 list_del(&sdata->u.vlan.list);
864                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
865                 /* no need to tell driver */
866                 break;
867         case NL80211_IFTYPE_MONITOR:
868                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
869                         local->cooked_mntrs--;
870                         break;
871                 }
872 
873                 local->monitors--;
874                 if (local->monitors == 0) {
875                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
876                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
877                 }
878 
879                 ieee80211_adjust_monitor_flags(sdata, -1);
880                 break;
881         case NL80211_IFTYPE_P2P_DEVICE:
882                 /* relies on synchronize_rcu() below */
883                 rcu_assign_pointer(local->p2p_sdata, NULL);
884                 /* fall through */
885         default:
886                 cancel_work_sync(&sdata->work);
887                 /*
888                  * When we get here, the interface is marked down.
889                  *
890                  * sta_info_flush_cleanup() requires rcu_barrier()
891                  * first to wait for the station call_rcu() calls
892                  * to complete, and we also need synchronize_rcu()
893                  * to wait for the RX path in case it is using the
894                  * interface and enqueuing frames at this very time on
895                  * another CPU.
896                  */
897                 synchronize_rcu();
898                 rcu_barrier();
899                 sta_info_flush_cleanup(sdata);
900 
901                 /*
902                  * Free all remaining keys, there shouldn't be any,
903                  * except maybe in WDS mode?
904                  */
905                 ieee80211_free_keys(sdata);
906 
907                 /* fall through */
908         case NL80211_IFTYPE_AP:
909                 skb_queue_purge(&sdata->skb_queue);
910         }
911 
912         sdata->bss = NULL;
913 
914         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
915         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
916                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
917                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
918                         if (info->control.vif == &sdata->vif) {
919                                 __skb_unlink(skb, &local->pending[i]);
920                                 ieee80211_free_txskb(&local->hw, skb);
921                         }
922                 }
923         }
924         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
925 
926         if (local->open_count == 0)
927                 ieee80211_clear_tx_pending(local);
928 
929         /*
930          * If the interface goes down while suspended, presumably because
931          * the device was unplugged and that happens before our resume,
932          * then the driver is already unconfigured and the remainder of
933          * this function isn't needed.
934          * XXX: what about WoWLAN? If the device has software state, e.g.
935          *      memory allocated, it might expect teardown commands from
936          *      mac80211 here?
937          */
938         if (local->suspended) {
939                 WARN_ON(local->wowlan);
940                 WARN_ON(rtnl_dereference(local->monitor_sdata));
941                 return;
942         }
943 
944         switch (sdata->vif.type) {
945         case NL80211_IFTYPE_AP_VLAN:
946                 break;
947         case NL80211_IFTYPE_MONITOR:
948                 if (local->monitors == 0)
949                         ieee80211_del_virtual_monitor(local);
950 
951                 mutex_lock(&local->mtx);
952                 ieee80211_recalc_idle(local);
953                 mutex_unlock(&local->mtx);
954 
955                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
956                         break;
957 
958                 /* fall through */
959         default:
960                 if (going_down)
961                         drv_remove_interface(local, sdata);
962         }
963 
964         ieee80211_recalc_ps(local, -1);
965 
966         if (local->open_count == 0) {
967                 ieee80211_stop_device(local);
968 
969                 /* no reconfiguring after stop! */
970                 return;
971         }
972 
973         /* do after stop to avoid reconfiguring when we stop anyway */
974         ieee80211_configure_filter(local);
975         ieee80211_hw_config(local, hw_reconf_flags);
976 
977         if (local->monitors == local->open_count)
978                 ieee80211_add_virtual_monitor(local);
979 }
980 
981 static int ieee80211_stop(struct net_device *dev)
982 {
983         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
984 
985         ieee80211_do_stop(sdata, true);
986 
987         return 0;
988 }
989 
990 static void ieee80211_set_multicast_list(struct net_device *dev)
991 {
992         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
993         struct ieee80211_local *local = sdata->local;
994         int allmulti, promisc, sdata_allmulti, sdata_promisc;
995 
996         allmulti = !!(dev->flags & IFF_ALLMULTI);
997         promisc = !!(dev->flags & IFF_PROMISC);
998         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
999         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1000 
1001         if (allmulti != sdata_allmulti) {
1002                 if (dev->flags & IFF_ALLMULTI)
1003                         atomic_inc(&local->iff_allmultis);
1004                 else
1005                         atomic_dec(&local->iff_allmultis);
1006                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1007         }
1008 
1009         if (promisc != sdata_promisc) {
1010                 if (dev->flags & IFF_PROMISC)
1011                         atomic_inc(&local->iff_promiscs);
1012                 else
1013                         atomic_dec(&local->iff_promiscs);
1014                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1015         }
1016 
1017         /*
1018          * TODO: If somebody needs this on AP interfaces,
1019          *       it can be enabled easily but multicast
1020          *       addresses from VLANs need to be synced.
1021          */
1022         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1023             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1024             sdata->vif.type != NL80211_IFTYPE_AP)
1025                 drv_set_multicast_list(local, sdata, &dev->mc);
1026 
1027         spin_lock_bh(&local->filter_lock);
1028         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1029         spin_unlock_bh(&local->filter_lock);
1030         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1031 }
1032 
1033 /*
1034  * Called when the netdev is removed or, by the code below, before
1035  * the interface type changes.
1036  */
1037 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1038 {
1039         int flushed;
1040         int i;
1041 
1042         /* free extra data */
1043         ieee80211_free_keys(sdata);
1044 
1045         ieee80211_debugfs_remove_netdev(sdata);
1046 
1047         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1048                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1049         sdata->fragment_next = 0;
1050 
1051         if (ieee80211_vif_is_mesh(&sdata->vif))
1052                 mesh_rmc_free(sdata);
1053 
1054         flushed = sta_info_flush(sdata);
1055         WARN_ON(flushed);
1056 }
1057 
1058 static void ieee80211_uninit(struct net_device *dev)
1059 {
1060         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1061 }
1062 
1063 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1064                                          struct sk_buff *skb,
1065                                          void *accel_priv)
1066 {
1067         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1068 }
1069 
1070 static const struct net_device_ops ieee80211_dataif_ops = {
1071         .ndo_open               = ieee80211_open,
1072         .ndo_stop               = ieee80211_stop,
1073         .ndo_uninit             = ieee80211_uninit,
1074         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1075         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1076         .ndo_change_mtu         = ieee80211_change_mtu,
1077         .ndo_set_mac_address    = ieee80211_change_mac,
1078         .ndo_select_queue       = ieee80211_netdev_select_queue,
1079 };
1080 
1081 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1082                                           struct sk_buff *skb,
1083                                           void *accel_priv)
1084 {
1085         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1086         struct ieee80211_local *local = sdata->local;
1087         struct ieee80211_hdr *hdr;
1088         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1089 
1090         if (local->hw.queues < IEEE80211_NUM_ACS)
1091                 return 0;
1092 
1093         if (skb->len < 4 ||
1094             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1095                 return 0; /* doesn't matter, frame will be dropped */
1096 
1097         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1098 
1099         return ieee80211_select_queue_80211(sdata, skb, hdr);
1100 }
1101 
1102 static const struct net_device_ops ieee80211_monitorif_ops = {
1103         .ndo_open               = ieee80211_open,
1104         .ndo_stop               = ieee80211_stop,
1105         .ndo_uninit             = ieee80211_uninit,
1106         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1107         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1108         .ndo_change_mtu         = ieee80211_change_mtu,
1109         .ndo_set_mac_address    = ieee80211_change_mac,
1110         .ndo_select_queue       = ieee80211_monitor_select_queue,
1111 };
1112 
1113 static void ieee80211_if_setup(struct net_device *dev)
1114 {
1115         ether_setup(dev);
1116         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1117         dev->netdev_ops = &ieee80211_dataif_ops;
1118         dev->destructor = free_netdev;
1119 }
1120 
1121 static void ieee80211_iface_work(struct work_struct *work)
1122 {
1123         struct ieee80211_sub_if_data *sdata =
1124                 container_of(work, struct ieee80211_sub_if_data, work);
1125         struct ieee80211_local *local = sdata->local;
1126         struct sk_buff *skb;
1127         struct sta_info *sta;
1128         struct ieee80211_ra_tid *ra_tid;
1129 
1130         if (!ieee80211_sdata_running(sdata))
1131                 return;
1132 
1133         if (local->scanning)
1134                 return;
1135 
1136         /*
1137          * ieee80211_queue_work() should have picked up most cases,
1138          * here we'll pick the rest.
1139          */
1140         if (WARN(local->suspended,
1141                  "interface work scheduled while going to suspend\n"))
1142                 return;
1143 
1144         /* first process frames */
1145         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1146                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1147 
1148                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1149                         ra_tid = (void *)&skb->cb;
1150                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1151                                                  ra_tid->tid);
1152                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1153                         ra_tid = (void *)&skb->cb;
1154                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1155                                                 ra_tid->tid);
1156                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1157                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1158                         int len = skb->len;
1159 
1160                         mutex_lock(&local->sta_mtx);
1161                         sta = sta_info_get_bss(sdata, mgmt->sa);
1162                         if (sta) {
1163                                 switch (mgmt->u.action.u.addba_req.action_code) {
1164                                 case WLAN_ACTION_ADDBA_REQ:
1165                                         ieee80211_process_addba_request(
1166                                                         local, sta, mgmt, len);
1167                                         break;
1168                                 case WLAN_ACTION_ADDBA_RESP:
1169                                         ieee80211_process_addba_resp(local, sta,
1170                                                                      mgmt, len);
1171                                         break;
1172                                 case WLAN_ACTION_DELBA:
1173                                         ieee80211_process_delba(sdata, sta,
1174                                                                 mgmt, len);
1175                                         break;
1176                                 default:
1177                                         WARN_ON(1);
1178                                         break;
1179                                 }
1180                         }
1181                         mutex_unlock(&local->sta_mtx);
1182                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1183                         struct ieee80211_hdr *hdr = (void *)mgmt;
1184                         /*
1185                          * So the frame isn't mgmt, but frame_control
1186                          * is at the right place anyway, of course, so
1187                          * the if statement is correct.
1188                          *
1189                          * Warn if we have other data frame types here,
1190                          * they must not get here.
1191                          */
1192                         WARN_ON(hdr->frame_control &
1193                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1194                         WARN_ON(!(hdr->seq_ctrl &
1195                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1196                         /*
1197                          * This was a fragment of a frame, received while
1198                          * a block-ack session was active. That cannot be
1199                          * right, so terminate the session.
1200                          */
1201                         mutex_lock(&local->sta_mtx);
1202                         sta = sta_info_get_bss(sdata, mgmt->sa);
1203                         if (sta) {
1204                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1205                                                 IEEE80211_QOS_CTL_TID_MASK;
1206 
1207                                 __ieee80211_stop_rx_ba_session(
1208                                         sta, tid, WLAN_BACK_RECIPIENT,
1209                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1210                                         true);
1211                         }
1212                         mutex_unlock(&local->sta_mtx);
1213                 } else switch (sdata->vif.type) {
1214                 case NL80211_IFTYPE_STATION:
1215                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1216                         break;
1217                 case NL80211_IFTYPE_ADHOC:
1218                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1219                         break;
1220                 case NL80211_IFTYPE_MESH_POINT:
1221                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1222                                 break;
1223                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1224                         break;
1225                 default:
1226                         WARN(1, "frame for unexpected interface type");
1227                         break;
1228                 }
1229 
1230                 kfree_skb(skb);
1231         }
1232 
1233         /* then other type-dependent work */
1234         switch (sdata->vif.type) {
1235         case NL80211_IFTYPE_STATION:
1236                 ieee80211_sta_work(sdata);
1237                 break;
1238         case NL80211_IFTYPE_ADHOC:
1239                 ieee80211_ibss_work(sdata);
1240                 break;
1241         case NL80211_IFTYPE_MESH_POINT:
1242                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1243                         break;
1244                 ieee80211_mesh_work(sdata);
1245                 break;
1246         default:
1247                 break;
1248         }
1249 }
1250 
1251 static void ieee80211_recalc_smps_work(struct work_struct *work)
1252 {
1253         struct ieee80211_sub_if_data *sdata =
1254                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1255 
1256         ieee80211_recalc_smps(sdata);
1257 }
1258 
1259 /*
1260  * Helper function to initialise an interface to a specific type.
1261  */
1262 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1263                                   enum nl80211_iftype type)
1264 {
1265         /* clear type-dependent union */
1266         memset(&sdata->u, 0, sizeof(sdata->u));
1267 
1268         /* and set some type-dependent values */
1269         sdata->vif.type = type;
1270         sdata->vif.p2p = false;
1271         sdata->wdev.iftype = type;
1272 
1273         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1274         sdata->control_port_no_encrypt = false;
1275 
1276         sdata->noack_map = 0;
1277 
1278         /* only monitor/p2p-device differ */
1279         if (sdata->dev) {
1280                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1281                 sdata->dev->type = ARPHRD_ETHER;
1282         }
1283 
1284         skb_queue_head_init(&sdata->skb_queue);
1285         INIT_WORK(&sdata->work, ieee80211_iface_work);
1286         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1287         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1288 
1289         switch (type) {
1290         case NL80211_IFTYPE_P2P_GO:
1291                 type = NL80211_IFTYPE_AP;
1292                 sdata->vif.type = type;
1293                 sdata->vif.p2p = true;
1294                 /* fall through */
1295         case NL80211_IFTYPE_AP:
1296                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1297                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1298                 INIT_WORK(&sdata->u.ap.request_smps_work,
1299                           ieee80211_request_smps_ap_work);
1300                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1301                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1302                 break;
1303         case NL80211_IFTYPE_P2P_CLIENT:
1304                 type = NL80211_IFTYPE_STATION;
1305                 sdata->vif.type = type;
1306                 sdata->vif.p2p = true;
1307                 /* fall through */
1308         case NL80211_IFTYPE_STATION:
1309                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1310                 ieee80211_sta_setup_sdata(sdata);
1311                 break;
1312         case NL80211_IFTYPE_ADHOC:
1313                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1314                 ieee80211_ibss_setup_sdata(sdata);
1315                 break;
1316         case NL80211_IFTYPE_MESH_POINT:
1317                 if (ieee80211_vif_is_mesh(&sdata->vif))
1318                         ieee80211_mesh_init_sdata(sdata);
1319                 break;
1320         case NL80211_IFTYPE_MONITOR:
1321                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1322                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1323                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1324                                       MONITOR_FLAG_OTHER_BSS;
1325                 break;
1326         case NL80211_IFTYPE_WDS:
1327                 sdata->vif.bss_conf.bssid = NULL;
1328                 break;
1329         case NL80211_IFTYPE_AP_VLAN:
1330         case NL80211_IFTYPE_P2P_DEVICE:
1331                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1332                 break;
1333         case NL80211_IFTYPE_UNSPECIFIED:
1334         case NUM_NL80211_IFTYPES:
1335                 BUG();
1336                 break;
1337         }
1338 
1339         ieee80211_debugfs_add_netdev(sdata);
1340 }
1341 
1342 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1343                                            enum nl80211_iftype type)
1344 {
1345         struct ieee80211_local *local = sdata->local;
1346         int ret, err;
1347         enum nl80211_iftype internal_type = type;
1348         bool p2p = false;
1349 
1350         ASSERT_RTNL();
1351 
1352         if (!local->ops->change_interface)
1353                 return -EBUSY;
1354 
1355         switch (sdata->vif.type) {
1356         case NL80211_IFTYPE_AP:
1357         case NL80211_IFTYPE_STATION:
1358         case NL80211_IFTYPE_ADHOC:
1359                 /*
1360                  * Could maybe also all others here?
1361                  * Just not sure how that interacts
1362                  * with the RX/config path e.g. for
1363                  * mesh.
1364                  */
1365                 break;
1366         default:
1367                 return -EBUSY;
1368         }
1369 
1370         switch (type) {
1371         case NL80211_IFTYPE_AP:
1372         case NL80211_IFTYPE_STATION:
1373         case NL80211_IFTYPE_ADHOC:
1374                 /*
1375                  * Could probably support everything
1376                  * but WDS here (WDS do_open can fail
1377                  * under memory pressure, which this
1378                  * code isn't prepared to handle).
1379                  */
1380                 break;
1381         case NL80211_IFTYPE_P2P_CLIENT:
1382                 p2p = true;
1383                 internal_type = NL80211_IFTYPE_STATION;
1384                 break;
1385         case NL80211_IFTYPE_P2P_GO:
1386                 p2p = true;
1387                 internal_type = NL80211_IFTYPE_AP;
1388                 break;
1389         default:
1390                 return -EBUSY;
1391         }
1392 
1393         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1394         if (ret)
1395                 return ret;
1396 
1397         ieee80211_do_stop(sdata, false);
1398 
1399         ieee80211_teardown_sdata(sdata);
1400 
1401         ret = drv_change_interface(local, sdata, internal_type, p2p);
1402         if (ret)
1403                 type = ieee80211_vif_type_p2p(&sdata->vif);
1404 
1405         /*
1406          * Ignore return value here, there's not much we can do since
1407          * the driver changed the interface type internally already.
1408          * The warnings will hopefully make driver authors fix it :-)
1409          */
1410         ieee80211_check_queues(sdata, type);
1411 
1412         ieee80211_setup_sdata(sdata, type);
1413 
1414         err = ieee80211_do_open(&sdata->wdev, false);
1415         WARN(err, "type change: do_open returned %d", err);
1416 
1417         return ret;
1418 }
1419 
1420 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1421                              enum nl80211_iftype type)
1422 {
1423         int ret;
1424 
1425         ASSERT_RTNL();
1426 
1427         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1428                 return 0;
1429 
1430         if (ieee80211_sdata_running(sdata)) {
1431                 ret = ieee80211_runtime_change_iftype(sdata, type);
1432                 if (ret)
1433                         return ret;
1434         } else {
1435                 /* Purge and reset type-dependent state. */
1436                 ieee80211_teardown_sdata(sdata);
1437                 ieee80211_setup_sdata(sdata, type);
1438         }
1439 
1440         /* reset some values that shouldn't be kept across type changes */
1441         sdata->drop_unencrypted = 0;
1442         if (type == NL80211_IFTYPE_STATION)
1443                 sdata->u.mgd.use_4addr = false;
1444 
1445         return 0;
1446 }
1447 
1448 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1449                                        u8 *perm_addr, enum nl80211_iftype type)
1450 {
1451         struct ieee80211_sub_if_data *sdata;
1452         u64 mask, start, addr, val, inc;
1453         u8 *m;
1454         u8 tmp_addr[ETH_ALEN];
1455         int i;
1456 
1457         /* default ... something at least */
1458         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1459 
1460         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1461             local->hw.wiphy->n_addresses <= 1)
1462                 return;
1463 
1464         mutex_lock(&local->iflist_mtx);
1465 
1466         switch (type) {
1467         case NL80211_IFTYPE_MONITOR:
1468                 /* doesn't matter */
1469                 break;
1470         case NL80211_IFTYPE_WDS:
1471         case NL80211_IFTYPE_AP_VLAN:
1472                 /* match up with an AP interface */
1473                 list_for_each_entry(sdata, &local->interfaces, list) {
1474                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1475                                 continue;
1476                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1477                         break;
1478                 }
1479                 /* keep default if no AP interface present */
1480                 break;
1481         case NL80211_IFTYPE_P2P_CLIENT:
1482         case NL80211_IFTYPE_P2P_GO:
1483                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1484                         list_for_each_entry(sdata, &local->interfaces, list) {
1485                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1486                                         continue;
1487                                 if (!ieee80211_sdata_running(sdata))
1488                                         continue;
1489                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1490                                 goto out_unlock;
1491                         }
1492                 }
1493                 /* otherwise fall through */
1494         default:
1495                 /* assign a new address if possible -- try n_addresses first */
1496                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1497                         bool used = false;
1498 
1499                         list_for_each_entry(sdata, &local->interfaces, list) {
1500                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1501                                            sdata->vif.addr, ETH_ALEN) == 0) {
1502                                         used = true;
1503                                         break;
1504                                 }
1505                         }
1506 
1507                         if (!used) {
1508                                 memcpy(perm_addr,
1509                                        local->hw.wiphy->addresses[i].addr,
1510                                        ETH_ALEN);
1511                                 break;
1512                         }
1513                 }
1514 
1515                 /* try mask if available */
1516                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1517                         break;
1518 
1519                 m = local->hw.wiphy->addr_mask;
1520                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1521                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1522                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1523 
1524                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1525                         /* not a contiguous mask ... not handled now! */
1526                         pr_info("not contiguous\n");
1527                         break;
1528                 }
1529 
1530                 /*
1531                  * Pick address of existing interface in case user changed
1532                  * MAC address manually, default to perm_addr.
1533                  */
1534                 m = local->hw.wiphy->perm_addr;
1535                 list_for_each_entry(sdata, &local->interfaces, list) {
1536                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1537                                 continue;
1538                         m = sdata->vif.addr;
1539                         break;
1540                 }
1541                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1542                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1543                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1544 
1545                 inc = 1ULL<<__ffs64(mask);
1546                 val = (start & mask);
1547                 addr = (start & ~mask) | (val & mask);
1548                 do {
1549                         bool used = false;
1550 
1551                         tmp_addr[5] = addr >> 0*8;
1552                         tmp_addr[4] = addr >> 1*8;
1553                         tmp_addr[3] = addr >> 2*8;
1554                         tmp_addr[2] = addr >> 3*8;
1555                         tmp_addr[1] = addr >> 4*8;
1556                         tmp_addr[0] = addr >> 5*8;
1557 
1558                         val += inc;
1559 
1560                         list_for_each_entry(sdata, &local->interfaces, list) {
1561                                 if (memcmp(tmp_addr, sdata->vif.addr,
1562                                                         ETH_ALEN) == 0) {
1563                                         used = true;
1564                                         break;
1565                                 }
1566                         }
1567 
1568                         if (!used) {
1569                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1570                                 break;
1571                         }
1572                         addr = (start & ~mask) | (val & mask);
1573                 } while (addr != start);
1574 
1575                 break;
1576         }
1577 
1578  out_unlock:
1579         mutex_unlock(&local->iflist_mtx);
1580 }
1581 
1582 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1583 {
1584         struct ieee80211_sub_if_data *sdata;
1585 
1586         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1587 
1588         ieee80211_cleanup_sdata_stas(sdata);
1589 }
1590 
1591 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1592                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1593                      struct vif_params *params)
1594 {
1595         struct net_device *ndev = NULL;
1596         struct ieee80211_sub_if_data *sdata = NULL;
1597         int ret, i;
1598         int txqs = 1;
1599 
1600         ASSERT_RTNL();
1601 
1602         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1603                 struct wireless_dev *wdev;
1604 
1605                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1606                                 GFP_KERNEL);
1607                 if (!sdata)
1608                         return -ENOMEM;
1609                 wdev = &sdata->wdev;
1610 
1611                 sdata->dev = NULL;
1612                 strlcpy(sdata->name, name, IFNAMSIZ);
1613                 ieee80211_assign_perm_addr(local, wdev->address, type);
1614                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1615         } else {
1616                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1617                         txqs = IEEE80211_NUM_ACS;
1618 
1619                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1620                                         local->hw.vif_data_size,
1621                                         name, ieee80211_if_setup, txqs, 1);
1622                 if (!ndev)
1623                         return -ENOMEM;
1624                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1625 
1626                 ndev->needed_headroom = local->tx_headroom +
1627                                         4*6 /* four MAC addresses */
1628                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1629                                         + 6 /* mesh */
1630                                         + 8 /* rfc1042/bridge tunnel */
1631                                         - ETH_HLEN /* ethernet hard_header_len */
1632                                         + IEEE80211_ENCRYPT_HEADROOM;
1633                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1634 
1635                 ret = dev_alloc_name(ndev, ndev->name);
1636                 if (ret < 0) {
1637                         free_netdev(ndev);
1638                         return ret;
1639                 }
1640 
1641                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1642                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1643                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1644 
1645                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1646                 sdata = netdev_priv(ndev);
1647                 ndev->ieee80211_ptr = &sdata->wdev;
1648                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1649                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1650 
1651                 sdata->dev = ndev;
1652         }
1653 
1654         /* initialise type-independent data */
1655         sdata->wdev.wiphy = local->hw.wiphy;
1656         sdata->local = local;
1657 
1658         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1659                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1660 
1661         INIT_LIST_HEAD(&sdata->key_list);
1662 
1663         spin_lock_init(&sdata->cleanup_stations_lock);
1664         INIT_LIST_HEAD(&sdata->cleanup_stations);
1665         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1666         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1667                           ieee80211_dfs_cac_timer_work);
1668         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1669                           ieee80211_delayed_tailroom_dec);
1670 
1671         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1672                 struct ieee80211_supported_band *sband;
1673                 sband = local->hw.wiphy->bands[i];
1674                 sdata->rc_rateidx_mask[i] =
1675                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1676                 if (sband)
1677                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1678                                sband->ht_cap.mcs.rx_mask,
1679                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1680                 else
1681                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1682                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1683         }
1684 
1685         ieee80211_set_default_queues(sdata);
1686 
1687         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1688         sdata->user_power_level = local->user_power_level;
1689 
1690         /* setup type-dependent data */
1691         ieee80211_setup_sdata(sdata, type);
1692 
1693         if (ndev) {
1694                 if (params) {
1695                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1696                         if (type == NL80211_IFTYPE_STATION)
1697                                 sdata->u.mgd.use_4addr = params->use_4addr;
1698                 }
1699 
1700                 ndev->features |= local->hw.netdev_features;
1701 
1702                 ret = register_netdevice(ndev);
1703                 if (ret) {
1704                         free_netdev(ndev);
1705                         return ret;
1706                 }
1707         }
1708 
1709         mutex_lock(&local->iflist_mtx);
1710         list_add_tail_rcu(&sdata->list, &local->interfaces);
1711         mutex_unlock(&local->iflist_mtx);
1712 
1713         if (new_wdev)
1714                 *new_wdev = &sdata->wdev;
1715 
1716         return 0;
1717 }
1718 
1719 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1720 {
1721         ASSERT_RTNL();
1722 
1723         mutex_lock(&sdata->local->iflist_mtx);
1724         list_del_rcu(&sdata->list);
1725         mutex_unlock(&sdata->local->iflist_mtx);
1726 
1727         synchronize_rcu();
1728 
1729         if (sdata->dev) {
1730                 unregister_netdevice(sdata->dev);
1731         } else {
1732                 cfg80211_unregister_wdev(&sdata->wdev);
1733                 kfree(sdata);
1734         }
1735 }
1736 
1737 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1738 {
1739         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1740                 return;
1741         ieee80211_do_stop(sdata, true);
1742         ieee80211_teardown_sdata(sdata);
1743 }
1744 
1745 /*
1746  * Remove all interfaces, may only be called at hardware unregistration
1747  * time because it doesn't do RCU-safe list removals.
1748  */
1749 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1750 {
1751         struct ieee80211_sub_if_data *sdata, *tmp;
1752         LIST_HEAD(unreg_list);
1753         LIST_HEAD(wdev_list);
1754 
1755         ASSERT_RTNL();
1756 
1757         /*
1758          * Close all AP_VLAN interfaces first, as otherwise they
1759          * might be closed while the AP interface they belong to
1760          * is closed, causing unregister_netdevice_many() to crash.
1761          */
1762         list_for_each_entry(sdata, &local->interfaces, list)
1763                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1764                         dev_close(sdata->dev);
1765 
1766         mutex_lock(&local->iflist_mtx);
1767         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1768                 list_del(&sdata->list);
1769 
1770                 if (sdata->dev)
1771                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1772                 else
1773                         list_add(&sdata->list, &wdev_list);
1774         }
1775         mutex_unlock(&local->iflist_mtx);
1776         unregister_netdevice_many(&unreg_list);
1777         list_del(&unreg_list);
1778 
1779         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1780                 list_del(&sdata->list);
1781                 cfg80211_unregister_wdev(&sdata->wdev);
1782                 kfree(sdata);
1783         }
1784 }
1785 
1786 static int netdev_notify(struct notifier_block *nb,
1787                          unsigned long state, void *ptr)
1788 {
1789         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1790         struct ieee80211_sub_if_data *sdata;
1791 
1792         if (state != NETDEV_CHANGENAME)
1793                 return 0;
1794 
1795         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1796                 return 0;
1797 
1798         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1799                 return 0;
1800 
1801         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1802 
1803         memcpy(sdata->name, dev->name, IFNAMSIZ);
1804 
1805         ieee80211_debugfs_rename_netdev(sdata);
1806         return 0;
1807 }
1808 
1809 static struct notifier_block mac80211_netdev_notifier = {
1810         .notifier_call = netdev_notify,
1811 };
1812 
1813 int ieee80211_iface_init(void)
1814 {
1815         return register_netdevice_notifier(&mac80211_netdev_notifier);
1816 }
1817 
1818 void ieee80211_iface_exit(void)
1819 {
1820         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1821 }
1822 

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