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

Version: ~ [ linux-5.0-rc6 ] ~ [ linux-4.20.10 ] ~ [ linux-4.19.23 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.101 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.158 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.174 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.134 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * Interface handling
  3  *
  4  * Copyright 2002-2005, Instant802 Networks, Inc.
  5  * Copyright 2005-2006, Devicescape Software, Inc.
  6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  8  * Copyright 2013-2014  Intel Mobile Communications GmbH
  9  * Copyright (c) 2016        Intel Deutschland GmbH
 10  * Copyright (C) 2018 Intel Corporation
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License version 2 as
 14  * published by the Free Software Foundation.
 15  */
 16 #include <linux/slab.h>
 17 #include <linux/kernel.h>
 18 #include <linux/if_arp.h>
 19 #include <linux/netdevice.h>
 20 #include <linux/rtnetlink.h>
 21 #include <net/mac80211.h>
 22 #include <net/ieee80211_radiotap.h>
 23 #include "ieee80211_i.h"
 24 #include "sta_info.h"
 25 #include "debugfs_netdev.h"
 26 #include "mesh.h"
 27 #include "led.h"
 28 #include "driver-ops.h"
 29 #include "wme.h"
 30 #include "rate.h"
 31 
 32 /**
 33  * DOC: Interface list locking
 34  *
 35  * The interface list in each struct ieee80211_local is protected
 36  * three-fold:
 37  *
 38  * (1) modifications may only be done under the RTNL
 39  * (2) modifications and readers are protected against each other by
 40  *     the iflist_mtx.
 41  * (3) modifications are done in an RCU manner so atomic readers
 42  *     can traverse the list in RCU-safe blocks.
 43  *
 44  * As a consequence, reads (traversals) of the list can be protected
 45  * by either the RTNL, the iflist_mtx or RCU.
 46  */
 47 
 48 static void ieee80211_iface_work(struct work_struct *work);
 49 
 50 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 51 {
 52         struct ieee80211_chanctx_conf *chanctx_conf;
 53         int power;
 54 
 55         rcu_read_lock();
 56         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 57         if (!chanctx_conf) {
 58                 rcu_read_unlock();
 59                 return false;
 60         }
 61 
 62         power = ieee80211_chandef_max_power(&chanctx_conf->def);
 63         rcu_read_unlock();
 64 
 65         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 66                 power = min(power, sdata->user_power_level);
 67 
 68         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
 69                 power = min(power, sdata->ap_power_level);
 70 
 71         if (power != sdata->vif.bss_conf.txpower) {
 72                 sdata->vif.bss_conf.txpower = power;
 73                 ieee80211_hw_config(sdata->local, 0);
 74                 return true;
 75         }
 76 
 77         return false;
 78 }
 79 
 80 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 81                               bool update_bss)
 82 {
 83         if (__ieee80211_recalc_txpower(sdata) ||
 84             (update_bss && ieee80211_sdata_running(sdata)))
 85                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 86 }
 87 
 88 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 89 {
 90         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
 91                 return 0;
 92 
 93         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
 94         return IEEE80211_CONF_CHANGE_IDLE;
 95 }
 96 
 97 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 98 {
 99         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
100                 return 0;
101 
102         ieee80211_flush_queues(local, NULL, false);
103 
104         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
105         return IEEE80211_CONF_CHANGE_IDLE;
106 }
107 
108 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
109                                    bool force_active)
110 {
111         bool working, scanning, active;
112         unsigned int led_trig_start = 0, led_trig_stop = 0;
113 
114         lockdep_assert_held(&local->mtx);
115 
116         active = force_active ||
117                  !list_empty(&local->chanctx_list) ||
118                  local->monitors;
119 
120         working = !local->ops->remain_on_channel &&
121                   !list_empty(&local->roc_list);
122 
123         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
124                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
125 
126         if (working || scanning)
127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128         else
129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
130 
131         if (active)
132                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133         else
134                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
135 
136         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
137 
138         if (working || scanning || active)
139                 return __ieee80211_idle_off(local);
140         return __ieee80211_idle_on(local);
141 }
142 
143 u32 ieee80211_idle_off(struct ieee80211_local *local)
144 {
145         return __ieee80211_recalc_idle(local, true);
146 }
147 
148 void ieee80211_recalc_idle(struct ieee80211_local *local)
149 {
150         u32 change = __ieee80211_recalc_idle(local, false);
151         if (change)
152                 ieee80211_hw_config(local, change);
153 }
154 
155 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
156                                 bool check_dup)
157 {
158         struct ieee80211_local *local = sdata->local;
159         struct ieee80211_sub_if_data *iter;
160         u64 new, mask, tmp;
161         u8 *m;
162         int ret = 0;
163 
164         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
165                 return 0;
166 
167         m = addr;
168         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
169                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
170                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
171 
172         m = local->hw.wiphy->addr_mask;
173         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176 
177         if (!check_dup)
178                 return ret;
179 
180         mutex_lock(&local->iflist_mtx);
181         list_for_each_entry(iter, &local->interfaces, list) {
182                 if (iter == sdata)
183                         continue;
184 
185                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
186                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
187                         continue;
188 
189                 m = iter->vif.addr;
190                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
191                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
192                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
193 
194                 if ((new & ~mask) != (tmp & ~mask)) {
195                         ret = -EINVAL;
196                         break;
197                 }
198         }
199         mutex_unlock(&local->iflist_mtx);
200 
201         return ret;
202 }
203 
204 static int ieee80211_change_mac(struct net_device *dev, void *addr)
205 {
206         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
207         struct sockaddr *sa = addr;
208         bool check_dup = true;
209         int ret;
210 
211         if (ieee80211_sdata_running(sdata))
212                 return -EBUSY;
213 
214         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
215             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
216                 check_dup = false;
217 
218         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
219         if (ret)
220                 return ret;
221 
222         ret = eth_mac_addr(dev, sa);
223 
224         if (ret == 0)
225                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
226 
227         return ret;
228 }
229 
230 static inline int identical_mac_addr_allowed(int type1, int type2)
231 {
232         return type1 == NL80211_IFTYPE_MONITOR ||
233                 type2 == NL80211_IFTYPE_MONITOR ||
234                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
235                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
236                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
237                 (type1 == NL80211_IFTYPE_WDS &&
238                         (type2 == NL80211_IFTYPE_WDS ||
239                          type2 == NL80211_IFTYPE_AP)) ||
240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
241                 (type1 == NL80211_IFTYPE_AP_VLAN &&
242                         (type2 == NL80211_IFTYPE_AP ||
243                          type2 == NL80211_IFTYPE_AP_VLAN));
244 }
245 
246 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
247                                             enum nl80211_iftype iftype)
248 {
249         struct ieee80211_local *local = sdata->local;
250         struct ieee80211_sub_if_data *nsdata;
251         int ret;
252 
253         ASSERT_RTNL();
254 
255         /* we hold the RTNL here so can safely walk the list */
256         list_for_each_entry(nsdata, &local->interfaces, list) {
257                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
258                         /*
259                          * Only OCB and monitor mode may coexist
260                          */
261                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
262                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
263                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
264                              nsdata->vif.type == NL80211_IFTYPE_OCB))
265                                 return -EBUSY;
266 
267                         /*
268                          * Allow only a single IBSS interface to be up at any
269                          * time. This is restricted because beacon distribution
270                          * cannot work properly if both are in the same IBSS.
271                          *
272                          * To remove this restriction we'd have to disallow them
273                          * from setting the same SSID on different IBSS interfaces
274                          * belonging to the same hardware. Then, however, we're
275                          * faced with having to adopt two different TSF timers...
276                          */
277                         if (iftype == NL80211_IFTYPE_ADHOC &&
278                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
279                                 return -EBUSY;
280                         /*
281                          * will not add another interface while any channel
282                          * switch is active.
283                          */
284                         if (nsdata->vif.csa_active)
285                                 return -EBUSY;
286 
287                         /*
288                          * The remaining checks are only performed for interfaces
289                          * with the same MAC address.
290                          */
291                         if (!ether_addr_equal(sdata->vif.addr,
292                                               nsdata->vif.addr))
293                                 continue;
294 
295                         /*
296                          * check whether it may have the same address
297                          */
298                         if (!identical_mac_addr_allowed(iftype,
299                                                         nsdata->vif.type))
300                                 return -ENOTUNIQ;
301 
302                         /*
303                          * can only add VLANs to enabled APs
304                          */
305                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
306                             nsdata->vif.type == NL80211_IFTYPE_AP)
307                                 sdata->bss = &nsdata->u.ap;
308                 }
309         }
310 
311         mutex_lock(&local->chanctx_mtx);
312         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
313         mutex_unlock(&local->chanctx_mtx);
314         return ret;
315 }
316 
317 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
318                                   enum nl80211_iftype iftype)
319 {
320         int n_queues = sdata->local->hw.queues;
321         int i;
322 
323         if (iftype == NL80211_IFTYPE_NAN)
324                 return 0;
325 
326         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
327                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
329                                          IEEE80211_INVAL_HW_QUEUE))
330                                 return -EINVAL;
331                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
332                                          n_queues))
333                                 return -EINVAL;
334                 }
335         }
336 
337         if ((iftype != NL80211_IFTYPE_AP &&
338              iftype != NL80211_IFTYPE_P2P_GO &&
339              iftype != NL80211_IFTYPE_MESH_POINT) ||
340             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
341                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
342                 return 0;
343         }
344 
345         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
346                 return -EINVAL;
347 
348         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
349                 return -EINVAL;
350 
351         return 0;
352 }
353 
354 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
355                                     const int offset)
356 {
357         struct ieee80211_local *local = sdata->local;
358         u32 flags = sdata->u.mntr.flags;
359 
360 #define ADJUST(_f, _s)  do {                                    \
361         if (flags & MONITOR_FLAG_##_f)                          \
362                 local->fif_##_s += offset;                      \
363         } while (0)
364 
365         ADJUST(FCSFAIL, fcsfail);
366         ADJUST(PLCPFAIL, plcpfail);
367         ADJUST(CONTROL, control);
368         ADJUST(CONTROL, pspoll);
369         ADJUST(OTHER_BSS, other_bss);
370 
371 #undef ADJUST
372 }
373 
374 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
375 {
376         struct ieee80211_local *local = sdata->local;
377         int i;
378 
379         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
380                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
381                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
382                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
383                         sdata->vif.hw_queue[i] = i;
384                 else
385                         sdata->vif.hw_queue[i] = 0;
386         }
387         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
388 }
389 
390 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
391 {
392         struct ieee80211_sub_if_data *sdata;
393         int ret;
394 
395         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
396                 return 0;
397 
398         ASSERT_RTNL();
399 
400         if (local->monitor_sdata)
401                 return 0;
402 
403         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
404         if (!sdata)
405                 return -ENOMEM;
406 
407         /* set up data */
408         sdata->local = local;
409         sdata->vif.type = NL80211_IFTYPE_MONITOR;
410         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
411                  wiphy_name(local->hw.wiphy));
412         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
413 
414         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
415 
416         ieee80211_set_default_queues(sdata);
417 
418         ret = drv_add_interface(local, sdata);
419         if (WARN_ON(ret)) {
420                 /* ok .. stupid driver, it asked for this! */
421                 kfree(sdata);
422                 return ret;
423         }
424 
425         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
426         if (ret) {
427                 kfree(sdata);
428                 return ret;
429         }
430 
431         mutex_lock(&local->iflist_mtx);
432         rcu_assign_pointer(local->monitor_sdata, sdata);
433         mutex_unlock(&local->iflist_mtx);
434 
435         mutex_lock(&local->mtx);
436         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
437                                         IEEE80211_CHANCTX_EXCLUSIVE);
438         mutex_unlock(&local->mtx);
439         if (ret) {
440                 mutex_lock(&local->iflist_mtx);
441                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
442                 mutex_unlock(&local->iflist_mtx);
443                 synchronize_net();
444                 drv_remove_interface(local, sdata);
445                 kfree(sdata);
446                 return ret;
447         }
448 
449         skb_queue_head_init(&sdata->skb_queue);
450         INIT_WORK(&sdata->work, ieee80211_iface_work);
451 
452         return 0;
453 }
454 
455 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
456 {
457         struct ieee80211_sub_if_data *sdata;
458 
459         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
460                 return;
461 
462         ASSERT_RTNL();
463 
464         mutex_lock(&local->iflist_mtx);
465 
466         sdata = rcu_dereference_protected(local->monitor_sdata,
467                                           lockdep_is_held(&local->iflist_mtx));
468         if (!sdata) {
469                 mutex_unlock(&local->iflist_mtx);
470                 return;
471         }
472 
473         RCU_INIT_POINTER(local->monitor_sdata, NULL);
474         mutex_unlock(&local->iflist_mtx);
475 
476         synchronize_net();
477 
478         mutex_lock(&local->mtx);
479         ieee80211_vif_release_channel(sdata);
480         mutex_unlock(&local->mtx);
481 
482         drv_remove_interface(local, sdata);
483 
484         kfree(sdata);
485 }
486 
487 /*
488  * NOTE: Be very careful when changing this function, it must NOT return
489  * an error on interface type changes that have been pre-checked, so most
490  * checks should be in ieee80211_check_concurrent_iface.
491  */
492 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
493 {
494         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
495         struct net_device *dev = wdev->netdev;
496         struct ieee80211_local *local = sdata->local;
497         struct sta_info *sta;
498         u32 changed = 0;
499         int res;
500         u32 hw_reconf_flags = 0;
501 
502         switch (sdata->vif.type) {
503         case NL80211_IFTYPE_WDS:
504                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
505                         return -ENOLINK;
506                 break;
507         case NL80211_IFTYPE_AP_VLAN: {
508                 struct ieee80211_sub_if_data *master;
509 
510                 if (!sdata->bss)
511                         return -ENOLINK;
512 
513                 mutex_lock(&local->mtx);
514                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
515                 mutex_unlock(&local->mtx);
516 
517                 master = container_of(sdata->bss,
518                                       struct ieee80211_sub_if_data, u.ap);
519                 sdata->control_port_protocol =
520                         master->control_port_protocol;
521                 sdata->control_port_no_encrypt =
522                         master->control_port_no_encrypt;
523                 sdata->control_port_over_nl80211 =
524                         master->control_port_over_nl80211;
525                 sdata->vif.cab_queue = master->vif.cab_queue;
526                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
527                        sizeof(sdata->vif.hw_queue));
528                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
529 
530                 mutex_lock(&local->key_mtx);
531                 sdata->crypto_tx_tailroom_needed_cnt +=
532                         master->crypto_tx_tailroom_needed_cnt;
533                 mutex_unlock(&local->key_mtx);
534 
535                 break;
536                 }
537         case NL80211_IFTYPE_AP:
538                 sdata->bss = &sdata->u.ap;
539                 break;
540         case NL80211_IFTYPE_MESH_POINT:
541         case NL80211_IFTYPE_STATION:
542         case NL80211_IFTYPE_MONITOR:
543         case NL80211_IFTYPE_ADHOC:
544         case NL80211_IFTYPE_P2P_DEVICE:
545         case NL80211_IFTYPE_OCB:
546         case NL80211_IFTYPE_NAN:
547                 /* no special treatment */
548                 break;
549         case NL80211_IFTYPE_UNSPECIFIED:
550         case NUM_NL80211_IFTYPES:
551         case NL80211_IFTYPE_P2P_CLIENT:
552         case NL80211_IFTYPE_P2P_GO:
553                 /* cannot happen */
554                 WARN_ON(1);
555                 break;
556         }
557 
558         if (local->open_count == 0) {
559                 res = drv_start(local);
560                 if (res)
561                         goto err_del_bss;
562                 /* we're brought up, everything changes */
563                 hw_reconf_flags = ~0;
564                 ieee80211_led_radio(local, true);
565                 ieee80211_mod_tpt_led_trig(local,
566                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
567         }
568 
569         /*
570          * Copy the hopefully now-present MAC address to
571          * this interface, if it has the special null one.
572          */
573         if (dev && is_zero_ether_addr(dev->dev_addr)) {
574                 memcpy(dev->dev_addr,
575                        local->hw.wiphy->perm_addr,
576                        ETH_ALEN);
577                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
578 
579                 if (!is_valid_ether_addr(dev->dev_addr)) {
580                         res = -EADDRNOTAVAIL;
581                         goto err_stop;
582                 }
583         }
584 
585         switch (sdata->vif.type) {
586         case NL80211_IFTYPE_AP_VLAN:
587                 /* no need to tell driver, but set carrier and chanctx */
588                 if (rtnl_dereference(sdata->bss->beacon)) {
589                         ieee80211_vif_vlan_copy_chanctx(sdata);
590                         netif_carrier_on(dev);
591                 } else {
592                         netif_carrier_off(dev);
593                 }
594                 break;
595         case NL80211_IFTYPE_MONITOR:
596                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
597                         local->cooked_mntrs++;
598                         break;
599                 }
600 
601                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
602                         res = drv_add_interface(local, sdata);
603                         if (res)
604                                 goto err_stop;
605                 } else if (local->monitors == 0 && local->open_count == 0) {
606                         res = ieee80211_add_virtual_monitor(local);
607                         if (res)
608                                 goto err_stop;
609                 }
610 
611                 /* must be before the call to ieee80211_configure_filter */
612                 local->monitors++;
613                 if (local->monitors == 1) {
614                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
615                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
616                 }
617 
618                 ieee80211_adjust_monitor_flags(sdata, 1);
619                 ieee80211_configure_filter(local);
620                 mutex_lock(&local->mtx);
621                 ieee80211_recalc_idle(local);
622                 mutex_unlock(&local->mtx);
623 
624                 netif_carrier_on(dev);
625                 break;
626         default:
627                 if (coming_up) {
628                         ieee80211_del_virtual_monitor(local);
629 
630                         res = drv_add_interface(local, sdata);
631                         if (res)
632                                 goto err_stop;
633                         res = ieee80211_check_queues(sdata,
634                                 ieee80211_vif_type_p2p(&sdata->vif));
635                         if (res)
636                                 goto err_del_interface;
637                 }
638 
639                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
640                         local->fif_pspoll++;
641                         local->fif_probe_req++;
642 
643                         ieee80211_configure_filter(local);
644                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
645                         local->fif_probe_req++;
646                 }
647 
648                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
649                     sdata->vif.type != NL80211_IFTYPE_NAN)
650                         changed |= ieee80211_reset_erp_info(sdata);
651                 ieee80211_bss_info_change_notify(sdata, changed);
652 
653                 switch (sdata->vif.type) {
654                 case NL80211_IFTYPE_STATION:
655                 case NL80211_IFTYPE_ADHOC:
656                 case NL80211_IFTYPE_AP:
657                 case NL80211_IFTYPE_MESH_POINT:
658                 case NL80211_IFTYPE_OCB:
659                         netif_carrier_off(dev);
660                         break;
661                 case NL80211_IFTYPE_WDS:
662                 case NL80211_IFTYPE_P2P_DEVICE:
663                 case NL80211_IFTYPE_NAN:
664                         break;
665                 default:
666                         /* not reached */
667                         WARN_ON(1);
668                 }
669 
670                 /*
671                  * Set default queue parameters so drivers don't
672                  * need to initialise the hardware if the hardware
673                  * doesn't start up with sane defaults.
674                  * Enable QoS for anything but station interfaces.
675                  */
676                 ieee80211_set_wmm_default(sdata, true,
677                         sdata->vif.type != NL80211_IFTYPE_STATION);
678         }
679 
680         set_bit(SDATA_STATE_RUNNING, &sdata->state);
681 
682         switch (sdata->vif.type) {
683         case NL80211_IFTYPE_WDS:
684                 /* Create STA entry for the WDS peer */
685                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
686                                      GFP_KERNEL);
687                 if (!sta) {
688                         res = -ENOMEM;
689                         goto err_del_interface;
690                 }
691 
692                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
693                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
694                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
695 
696                 res = sta_info_insert(sta);
697                 if (res) {
698                         /* STA has been freed */
699                         goto err_del_interface;
700                 }
701 
702                 rate_control_rate_init(sta);
703                 netif_carrier_on(dev);
704                 break;
705         case NL80211_IFTYPE_P2P_DEVICE:
706                 rcu_assign_pointer(local->p2p_sdata, sdata);
707                 break;
708         case NL80211_IFTYPE_MONITOR:
709                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
710                         break;
711                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
712                 break;
713         default:
714                 break;
715         }
716 
717         /*
718          * set_multicast_list will be invoked by the networking core
719          * which will check whether any increments here were done in
720          * error and sync them down to the hardware as filter flags.
721          */
722         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
723                 atomic_inc(&local->iff_allmultis);
724 
725         if (coming_up)
726                 local->open_count++;
727 
728         if (hw_reconf_flags)
729                 ieee80211_hw_config(local, hw_reconf_flags);
730 
731         ieee80211_recalc_ps(local);
732 
733         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
734             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
735             local->ops->wake_tx_queue) {
736                 /* XXX: for AP_VLAN, actually track AP queues */
737                 if (dev)
738                         netif_tx_start_all_queues(dev);
739         } else if (dev) {
740                 unsigned long flags;
741                 int n_acs = IEEE80211_NUM_ACS;
742                 int ac;
743 
744                 if (local->hw.queues < IEEE80211_NUM_ACS)
745                         n_acs = 1;
746 
747                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
748                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
749                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
750                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
751                         for (ac = 0; ac < n_acs; ac++) {
752                                 int ac_queue = sdata->vif.hw_queue[ac];
753 
754                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
755                                     skb_queue_empty(&local->pending[ac_queue]))
756                                         netif_start_subqueue(dev, ac);
757                         }
758                 }
759                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
760         }
761 
762         return 0;
763  err_del_interface:
764         drv_remove_interface(local, sdata);
765  err_stop:
766         if (!local->open_count)
767                 drv_stop(local);
768  err_del_bss:
769         sdata->bss = NULL;
770         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
771                 mutex_lock(&local->mtx);
772                 list_del(&sdata->u.vlan.list);
773                 mutex_unlock(&local->mtx);
774         }
775         /* might already be clear but that doesn't matter */
776         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
777         return res;
778 }
779 
780 static int ieee80211_open(struct net_device *dev)
781 {
782         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
783         int err;
784 
785         /* fail early if user set an invalid address */
786         if (!is_valid_ether_addr(dev->dev_addr))
787                 return -EADDRNOTAVAIL;
788 
789         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
790         if (err)
791                 return err;
792 
793         return ieee80211_do_open(&sdata->wdev, true);
794 }
795 
796 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
797                               bool going_down)
798 {
799         struct ieee80211_local *local = sdata->local;
800         unsigned long flags;
801         struct sk_buff *skb, *tmp;
802         u32 hw_reconf_flags = 0;
803         int i, flushed;
804         struct ps_data *ps;
805         struct cfg80211_chan_def chandef;
806         bool cancel_scan;
807         struct cfg80211_nan_func *func;
808 
809         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
810 
811         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
812         if (cancel_scan)
813                 ieee80211_scan_cancel(local);
814 
815         /*
816          * Stop TX on this interface first.
817          */
818         if (sdata->dev)
819                 netif_tx_stop_all_queues(sdata->dev);
820 
821         ieee80211_roc_purge(local, sdata);
822 
823         switch (sdata->vif.type) {
824         case NL80211_IFTYPE_STATION:
825                 ieee80211_mgd_stop(sdata);
826                 break;
827         case NL80211_IFTYPE_ADHOC:
828                 ieee80211_ibss_stop(sdata);
829                 break;
830         case NL80211_IFTYPE_AP:
831                 cancel_work_sync(&sdata->u.ap.request_smps_work);
832                 break;
833         case NL80211_IFTYPE_MONITOR:
834                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
835                         break;
836                 list_del_rcu(&sdata->u.mntr.list);
837                 break;
838         default:
839                 break;
840         }
841 
842         /*
843          * Remove all stations associated with this interface.
844          *
845          * This must be done before calling ops->remove_interface()
846          * because otherwise we can later invoke ops->sta_notify()
847          * whenever the STAs are removed, and that invalidates driver
848          * assumptions about always getting a vif pointer that is valid
849          * (because if we remove a STA after ops->remove_interface()
850          * the driver will have removed the vif info already!)
851          *
852          * In WDS mode a station must exist here and be flushed, for
853          * AP_VLANs stations may exist since there's nothing else that
854          * would have removed them, but in other modes there shouldn't
855          * be any stations.
856          */
857         flushed = sta_info_flush(sdata);
858         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
859                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
860                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
861 
862         /* don't count this interface for allmulti while it is down */
863         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
864                 atomic_dec(&local->iff_allmultis);
865 
866         if (sdata->vif.type == NL80211_IFTYPE_AP) {
867                 local->fif_pspoll--;
868                 local->fif_probe_req--;
869         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
870                 local->fif_probe_req--;
871         }
872 
873         if (sdata->dev) {
874                 netif_addr_lock_bh(sdata->dev);
875                 spin_lock_bh(&local->filter_lock);
876                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
877                                  sdata->dev->addr_len);
878                 spin_unlock_bh(&local->filter_lock);
879                 netif_addr_unlock_bh(sdata->dev);
880         }
881 
882         del_timer_sync(&local->dynamic_ps_timer);
883         cancel_work_sync(&local->dynamic_ps_enable_work);
884 
885         cancel_work_sync(&sdata->recalc_smps);
886         sdata_lock(sdata);
887         mutex_lock(&local->mtx);
888         sdata->vif.csa_active = false;
889         if (sdata->vif.type == NL80211_IFTYPE_STATION)
890                 sdata->u.mgd.csa_waiting_bcn = false;
891         if (sdata->csa_block_tx) {
892                 ieee80211_wake_vif_queues(local, sdata,
893                                           IEEE80211_QUEUE_STOP_REASON_CSA);
894                 sdata->csa_block_tx = false;
895         }
896         mutex_unlock(&local->mtx);
897         sdata_unlock(sdata);
898 
899         cancel_work_sync(&sdata->csa_finalize_work);
900 
901         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
902 
903         if (sdata->wdev.cac_started) {
904                 chandef = sdata->vif.bss_conf.chandef;
905                 WARN_ON(local->suspended);
906                 mutex_lock(&local->mtx);
907                 ieee80211_vif_release_channel(sdata);
908                 mutex_unlock(&local->mtx);
909                 cfg80211_cac_event(sdata->dev, &chandef,
910                                    NL80211_RADAR_CAC_ABORTED,
911                                    GFP_KERNEL);
912         }
913 
914         /* APs need special treatment */
915         if (sdata->vif.type == NL80211_IFTYPE_AP) {
916                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
917 
918                 /* down all dependent devices, that is VLANs */
919                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
920                                          u.vlan.list)
921                         dev_close(vlan->dev);
922                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
923         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
924                 /* remove all packets in parent bc_buf pointing to this dev */
925                 ps = &sdata->bss->ps;
926 
927                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
928                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
929                         if (skb->dev == sdata->dev) {
930                                 __skb_unlink(skb, &ps->bc_buf);
931                                 local->total_ps_buffered--;
932                                 ieee80211_free_txskb(&local->hw, skb);
933                         }
934                 }
935                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
936         }
937 
938         if (going_down)
939                 local->open_count--;
940 
941         switch (sdata->vif.type) {
942         case NL80211_IFTYPE_AP_VLAN:
943                 mutex_lock(&local->mtx);
944                 list_del(&sdata->u.vlan.list);
945                 mutex_unlock(&local->mtx);
946                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
947                 /* see comment in the default case below */
948                 ieee80211_free_keys(sdata, true);
949                 /* no need to tell driver */
950                 break;
951         case NL80211_IFTYPE_MONITOR:
952                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
953                         local->cooked_mntrs--;
954                         break;
955                 }
956 
957                 local->monitors--;
958                 if (local->monitors == 0) {
959                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
960                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
961                 }
962 
963                 ieee80211_adjust_monitor_flags(sdata, -1);
964                 break;
965         case NL80211_IFTYPE_NAN:
966                 /* clean all the functions */
967                 spin_lock_bh(&sdata->u.nan.func_lock);
968 
969                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
970                         idr_remove(&sdata->u.nan.function_inst_ids, i);
971                         cfg80211_free_nan_func(func);
972                 }
973                 idr_destroy(&sdata->u.nan.function_inst_ids);
974 
975                 spin_unlock_bh(&sdata->u.nan.func_lock);
976                 break;
977         case NL80211_IFTYPE_P2P_DEVICE:
978                 /* relies on synchronize_rcu() below */
979                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
980                 /* fall through */
981         default:
982                 cancel_work_sync(&sdata->work);
983                 /*
984                  * When we get here, the interface is marked down.
985                  * Free the remaining keys, if there are any
986                  * (which can happen in AP mode if userspace sets
987                  * keys before the interface is operating, and maybe
988                  * also in WDS mode)
989                  *
990                  * Force the key freeing to always synchronize_net()
991                  * to wait for the RX path in case it is using this
992                  * interface enqueuing frames at this very time on
993                  * another CPU.
994                  */
995                 ieee80211_free_keys(sdata, true);
996                 skb_queue_purge(&sdata->skb_queue);
997         }
998 
999         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1000         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1001                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1002                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1003                         if (info->control.vif == &sdata->vif) {
1004                                 __skb_unlink(skb, &local->pending[i]);
1005                                 ieee80211_free_txskb(&local->hw, skb);
1006                         }
1007                 }
1008         }
1009         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1010 
1011         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1012                 ieee80211_txq_remove_vlan(local, sdata);
1013 
1014         sdata->bss = NULL;
1015 
1016         if (local->open_count == 0)
1017                 ieee80211_clear_tx_pending(local);
1018 
1019         sdata->vif.bss_conf.beacon_int = 0;
1020 
1021         /*
1022          * If the interface goes down while suspended, presumably because
1023          * the device was unplugged and that happens before our resume,
1024          * then the driver is already unconfigured and the remainder of
1025          * this function isn't needed.
1026          * XXX: what about WoWLAN? If the device has software state, e.g.
1027          *      memory allocated, it might expect teardown commands from
1028          *      mac80211 here?
1029          */
1030         if (local->suspended) {
1031                 WARN_ON(local->wowlan);
1032                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1033                 return;
1034         }
1035 
1036         switch (sdata->vif.type) {
1037         case NL80211_IFTYPE_AP_VLAN:
1038                 break;
1039         case NL80211_IFTYPE_MONITOR:
1040                 if (local->monitors == 0)
1041                         ieee80211_del_virtual_monitor(local);
1042 
1043                 mutex_lock(&local->mtx);
1044                 ieee80211_recalc_idle(local);
1045                 mutex_unlock(&local->mtx);
1046 
1047                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1048                         break;
1049 
1050                 /* fall through */
1051         default:
1052                 if (going_down)
1053                         drv_remove_interface(local, sdata);
1054         }
1055 
1056         ieee80211_recalc_ps(local);
1057 
1058         if (cancel_scan)
1059                 flush_delayed_work(&local->scan_work);
1060 
1061         if (local->open_count == 0) {
1062                 ieee80211_stop_device(local);
1063 
1064                 /* no reconfiguring after stop! */
1065                 return;
1066         }
1067 
1068         /* do after stop to avoid reconfiguring when we stop anyway */
1069         ieee80211_configure_filter(local);
1070         ieee80211_hw_config(local, hw_reconf_flags);
1071 
1072         if (local->monitors == local->open_count)
1073                 ieee80211_add_virtual_monitor(local);
1074 }
1075 
1076 static int ieee80211_stop(struct net_device *dev)
1077 {
1078         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1079 
1080         ieee80211_do_stop(sdata, true);
1081 
1082         return 0;
1083 }
1084 
1085 static void ieee80211_set_multicast_list(struct net_device *dev)
1086 {
1087         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1088         struct ieee80211_local *local = sdata->local;
1089         int allmulti, sdata_allmulti;
1090 
1091         allmulti = !!(dev->flags & IFF_ALLMULTI);
1092         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1093 
1094         if (allmulti != sdata_allmulti) {
1095                 if (dev->flags & IFF_ALLMULTI)
1096                         atomic_inc(&local->iff_allmultis);
1097                 else
1098                         atomic_dec(&local->iff_allmultis);
1099                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1100         }
1101 
1102         spin_lock_bh(&local->filter_lock);
1103         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1104         spin_unlock_bh(&local->filter_lock);
1105         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1106 }
1107 
1108 /*
1109  * Called when the netdev is removed or, by the code below, before
1110  * the interface type changes.
1111  */
1112 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1113 {
1114         int i;
1115 
1116         /* free extra data */
1117         ieee80211_free_keys(sdata, false);
1118 
1119         ieee80211_debugfs_remove_netdev(sdata);
1120 
1121         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1122                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1123         sdata->fragment_next = 0;
1124 
1125         if (ieee80211_vif_is_mesh(&sdata->vif))
1126                 ieee80211_mesh_teardown_sdata(sdata);
1127 }
1128 
1129 static void ieee80211_uninit(struct net_device *dev)
1130 {
1131         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1132 }
1133 
1134 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1135                                          struct sk_buff *skb,
1136                                          struct net_device *sb_dev,
1137                                          select_queue_fallback_t fallback)
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                                           select_queue_fallback_t fallback)
1184 {
1185         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1186         struct ieee80211_local *local = sdata->local;
1187         struct ieee80211_hdr *hdr;
1188         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1189 
1190         if (local->hw.queues < IEEE80211_NUM_ACS)
1191                 return 0;
1192 
1193         if (skb->len < 4 ||
1194             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1195                 return 0; /* doesn't matter, frame will be dropped */
1196 
1197         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1198 
1199         return ieee80211_select_queue_80211(sdata, skb, hdr);
1200 }
1201 
1202 static const struct net_device_ops ieee80211_monitorif_ops = {
1203         .ndo_open               = ieee80211_open,
1204         .ndo_stop               = ieee80211_stop,
1205         .ndo_uninit             = ieee80211_uninit,
1206         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1207         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1208         .ndo_set_mac_address    = ieee80211_change_mac,
1209         .ndo_select_queue       = ieee80211_monitor_select_queue,
1210         .ndo_get_stats64        = ieee80211_get_stats64,
1211 };
1212 
1213 static void ieee80211_if_free(struct net_device *dev)
1214 {
1215         free_percpu(dev->tstats);
1216 }
1217 
1218 static void ieee80211_if_setup(struct net_device *dev)
1219 {
1220         ether_setup(dev);
1221         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1222         dev->netdev_ops = &ieee80211_dataif_ops;
1223         dev->needs_free_netdev = true;
1224         dev->priv_destructor = ieee80211_if_free;
1225 }
1226 
1227 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1228 {
1229         ieee80211_if_setup(dev);
1230         dev->priv_flags |= IFF_NO_QUEUE;
1231 }
1232 
1233 static void ieee80211_iface_work(struct work_struct *work)
1234 {
1235         struct ieee80211_sub_if_data *sdata =
1236                 container_of(work, struct ieee80211_sub_if_data, work);
1237         struct ieee80211_local *local = sdata->local;
1238         struct sk_buff *skb;
1239         struct sta_info *sta;
1240 
1241         if (!ieee80211_sdata_running(sdata))
1242                 return;
1243 
1244         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1245                 return;
1246 
1247         if (!ieee80211_can_run_worker(local))
1248                 return;
1249 
1250         /* first process frames */
1251         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1252                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1253 
1254                 if (ieee80211_is_action(mgmt->frame_control) &&
1255                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1256                         int len = skb->len;
1257 
1258                         mutex_lock(&local->sta_mtx);
1259                         sta = sta_info_get_bss(sdata, mgmt->sa);
1260                         if (sta) {
1261                                 switch (mgmt->u.action.u.addba_req.action_code) {
1262                                 case WLAN_ACTION_ADDBA_REQ:
1263                                         ieee80211_process_addba_request(
1264                                                         local, sta, mgmt, len);
1265                                         break;
1266                                 case WLAN_ACTION_ADDBA_RESP:
1267                                         ieee80211_process_addba_resp(local, sta,
1268                                                                      mgmt, len);
1269                                         break;
1270                                 case WLAN_ACTION_DELBA:
1271                                         ieee80211_process_delba(sdata, sta,
1272                                                                 mgmt, len);
1273                                         break;
1274                                 default:
1275                                         WARN_ON(1);
1276                                         break;
1277                                 }
1278                         }
1279                         mutex_unlock(&local->sta_mtx);
1280                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1281                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1282                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1283                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1284                                 struct ieee80211_rx_status *status;
1285                                 enum nl80211_band band;
1286                                 u8 opmode;
1287 
1288                                 status = IEEE80211_SKB_RXCB(skb);
1289                                 band = status->band;
1290                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1291 
1292                                 mutex_lock(&local->sta_mtx);
1293                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1294 
1295                                 if (sta)
1296                                         ieee80211_vht_handle_opmode(sdata, sta,
1297                                                                     opmode,
1298                                                                     band);
1299 
1300                                 mutex_unlock(&local->sta_mtx);
1301                                 break;
1302                         }
1303                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1304                                 ieee80211_process_mu_groups(sdata, mgmt);
1305                                 break;
1306                         default:
1307                                 WARN_ON(1);
1308                                 break;
1309                         }
1310                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1311                         struct ieee80211_hdr *hdr = (void *)mgmt;
1312                         /*
1313                          * So the frame isn't mgmt, but frame_control
1314                          * is at the right place anyway, of course, so
1315                          * the if statement is correct.
1316                          *
1317                          * Warn if we have other data frame types here,
1318                          * they must not get here.
1319                          */
1320                         WARN_ON(hdr->frame_control &
1321                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1322                         WARN_ON(!(hdr->seq_ctrl &
1323                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1324                         /*
1325                          * This was a fragment of a frame, received while
1326                          * a block-ack session was active. That cannot be
1327                          * right, so terminate the session.
1328                          */
1329                         mutex_lock(&local->sta_mtx);
1330                         sta = sta_info_get_bss(sdata, mgmt->sa);
1331                         if (sta) {
1332                                 u16 tid = ieee80211_get_tid(hdr);
1333 
1334                                 __ieee80211_stop_rx_ba_session(
1335                                         sta, tid, WLAN_BACK_RECIPIENT,
1336                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1337                                         true);
1338                         }
1339                         mutex_unlock(&local->sta_mtx);
1340                 } else switch (sdata->vif.type) {
1341                 case NL80211_IFTYPE_STATION:
1342                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1343                         break;
1344                 case NL80211_IFTYPE_ADHOC:
1345                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1346                         break;
1347                 case NL80211_IFTYPE_MESH_POINT:
1348                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1349                                 break;
1350                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1351                         break;
1352                 default:
1353                         WARN(1, "frame for unexpected interface type");
1354                         break;
1355                 }
1356 
1357                 kfree_skb(skb);
1358         }
1359 
1360         /* then other type-dependent work */
1361         switch (sdata->vif.type) {
1362         case NL80211_IFTYPE_STATION:
1363                 ieee80211_sta_work(sdata);
1364                 break;
1365         case NL80211_IFTYPE_ADHOC:
1366                 ieee80211_ibss_work(sdata);
1367                 break;
1368         case NL80211_IFTYPE_MESH_POINT:
1369                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1370                         break;
1371                 ieee80211_mesh_work(sdata);
1372                 break;
1373         case NL80211_IFTYPE_OCB:
1374                 ieee80211_ocb_work(sdata);
1375                 break;
1376         default:
1377                 break;
1378         }
1379 }
1380 
1381 static void ieee80211_recalc_smps_work(struct work_struct *work)
1382 {
1383         struct ieee80211_sub_if_data *sdata =
1384                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1385 
1386         ieee80211_recalc_smps(sdata);
1387 }
1388 
1389 /*
1390  * Helper function to initialise an interface to a specific type.
1391  */
1392 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1393                                   enum nl80211_iftype type)
1394 {
1395         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1396                                                     0xff, 0xff, 0xff};
1397 
1398         /* clear type-dependent union */
1399         memset(&sdata->u, 0, sizeof(sdata->u));
1400 
1401         /* and set some type-dependent values */
1402         sdata->vif.type = type;
1403         sdata->vif.p2p = false;
1404         sdata->wdev.iftype = type;
1405 
1406         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1407         sdata->control_port_no_encrypt = false;
1408         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1409         sdata->vif.bss_conf.idle = true;
1410 
1411         sdata->noack_map = 0;
1412 
1413         /* only monitor/p2p-device differ */
1414         if (sdata->dev) {
1415                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1416                 sdata->dev->type = ARPHRD_ETHER;
1417         }
1418 
1419         skb_queue_head_init(&sdata->skb_queue);
1420         INIT_WORK(&sdata->work, ieee80211_iface_work);
1421         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1422         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1423         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1424         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1425 
1426         switch (type) {
1427         case NL80211_IFTYPE_P2P_GO:
1428                 type = NL80211_IFTYPE_AP;
1429                 sdata->vif.type = type;
1430                 sdata->vif.p2p = true;
1431                 /* fall through */
1432         case NL80211_IFTYPE_AP:
1433                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1434                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1435                 INIT_WORK(&sdata->u.ap.request_smps_work,
1436                           ieee80211_request_smps_ap_work);
1437                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1438                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1439                 break;
1440         case NL80211_IFTYPE_P2P_CLIENT:
1441                 type = NL80211_IFTYPE_STATION;
1442                 sdata->vif.type = type;
1443                 sdata->vif.p2p = true;
1444                 /* fall through */
1445         case NL80211_IFTYPE_STATION:
1446                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1447                 ieee80211_sta_setup_sdata(sdata);
1448                 break;
1449         case NL80211_IFTYPE_OCB:
1450                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1451                 ieee80211_ocb_setup_sdata(sdata);
1452                 break;
1453         case NL80211_IFTYPE_ADHOC:
1454                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1455                 ieee80211_ibss_setup_sdata(sdata);
1456                 break;
1457         case NL80211_IFTYPE_MESH_POINT:
1458                 if (ieee80211_vif_is_mesh(&sdata->vif))
1459                         ieee80211_mesh_init_sdata(sdata);
1460                 break;
1461         case NL80211_IFTYPE_MONITOR:
1462                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1463                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1464                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1465                                       MONITOR_FLAG_OTHER_BSS;
1466                 break;
1467         case NL80211_IFTYPE_WDS:
1468                 sdata->vif.bss_conf.bssid = NULL;
1469                 break;
1470         case NL80211_IFTYPE_NAN:
1471                 idr_init(&sdata->u.nan.function_inst_ids);
1472                 spin_lock_init(&sdata->u.nan.func_lock);
1473                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1474                 break;
1475         case NL80211_IFTYPE_AP_VLAN:
1476         case NL80211_IFTYPE_P2P_DEVICE:
1477                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1478                 break;
1479         case NL80211_IFTYPE_UNSPECIFIED:
1480         case NUM_NL80211_IFTYPES:
1481                 WARN_ON(1);
1482                 break;
1483         }
1484 
1485         ieee80211_debugfs_add_netdev(sdata);
1486 }
1487 
1488 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1489                                            enum nl80211_iftype type)
1490 {
1491         struct ieee80211_local *local = sdata->local;
1492         int ret, err;
1493         enum nl80211_iftype internal_type = type;
1494         bool p2p = false;
1495 
1496         ASSERT_RTNL();
1497 
1498         if (!local->ops->change_interface)
1499                 return -EBUSY;
1500 
1501         switch (sdata->vif.type) {
1502         case NL80211_IFTYPE_AP:
1503         case NL80211_IFTYPE_STATION:
1504         case NL80211_IFTYPE_ADHOC:
1505         case NL80211_IFTYPE_OCB:
1506                 /*
1507                  * Could maybe also all others here?
1508                  * Just not sure how that interacts
1509                  * with the RX/config path e.g. for
1510                  * mesh.
1511                  */
1512                 break;
1513         default:
1514                 return -EBUSY;
1515         }
1516 
1517         switch (type) {
1518         case NL80211_IFTYPE_AP:
1519         case NL80211_IFTYPE_STATION:
1520         case NL80211_IFTYPE_ADHOC:
1521         case NL80211_IFTYPE_OCB:
1522                 /*
1523                  * Could probably support everything
1524                  * but WDS here (WDS do_open can fail
1525                  * under memory pressure, which this
1526                  * code isn't prepared to handle).
1527                  */
1528                 break;
1529         case NL80211_IFTYPE_P2P_CLIENT:
1530                 p2p = true;
1531                 internal_type = NL80211_IFTYPE_STATION;
1532                 break;
1533         case NL80211_IFTYPE_P2P_GO:
1534                 p2p = true;
1535                 internal_type = NL80211_IFTYPE_AP;
1536                 break;
1537         default:
1538                 return -EBUSY;
1539         }
1540 
1541         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1542         if (ret)
1543                 return ret;
1544 
1545         ieee80211_do_stop(sdata, false);
1546 
1547         ieee80211_teardown_sdata(sdata);
1548 
1549         ret = drv_change_interface(local, sdata, internal_type, p2p);
1550         if (ret)
1551                 type = ieee80211_vif_type_p2p(&sdata->vif);
1552 
1553         /*
1554          * Ignore return value here, there's not much we can do since
1555          * the driver changed the interface type internally already.
1556          * The warnings will hopefully make driver authors fix it :-)
1557          */
1558         ieee80211_check_queues(sdata, type);
1559 
1560         ieee80211_setup_sdata(sdata, type);
1561 
1562         err = ieee80211_do_open(&sdata->wdev, false);
1563         WARN(err, "type change: do_open returned %d", err);
1564 
1565         return ret;
1566 }
1567 
1568 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1569                              enum nl80211_iftype type)
1570 {
1571         int ret;
1572 
1573         ASSERT_RTNL();
1574 
1575         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1576                 return 0;
1577 
1578         if (ieee80211_sdata_running(sdata)) {
1579                 ret = ieee80211_runtime_change_iftype(sdata, type);
1580                 if (ret)
1581                         return ret;
1582         } else {
1583                 /* Purge and reset type-dependent state. */
1584                 ieee80211_teardown_sdata(sdata);
1585                 ieee80211_setup_sdata(sdata, type);
1586         }
1587 
1588         /* reset some values that shouldn't be kept across type changes */
1589         if (type == NL80211_IFTYPE_STATION)
1590                 sdata->u.mgd.use_4addr = false;
1591 
1592         return 0;
1593 }
1594 
1595 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1596                                        u8 *perm_addr, enum nl80211_iftype type)
1597 {
1598         struct ieee80211_sub_if_data *sdata;
1599         u64 mask, start, addr, val, inc;
1600         u8 *m;
1601         u8 tmp_addr[ETH_ALEN];
1602         int i;
1603 
1604         /* default ... something at least */
1605         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1606 
1607         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1608             local->hw.wiphy->n_addresses <= 1)
1609                 return;
1610 
1611         mutex_lock(&local->iflist_mtx);
1612 
1613         switch (type) {
1614         case NL80211_IFTYPE_MONITOR:
1615                 /* doesn't matter */
1616                 break;
1617         case NL80211_IFTYPE_WDS:
1618         case NL80211_IFTYPE_AP_VLAN:
1619                 /* match up with an AP interface */
1620                 list_for_each_entry(sdata, &local->interfaces, list) {
1621                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1622                                 continue;
1623                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1624                         break;
1625                 }
1626                 /* keep default if no AP interface present */
1627                 break;
1628         case NL80211_IFTYPE_P2P_CLIENT:
1629         case NL80211_IFTYPE_P2P_GO:
1630                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1631                         list_for_each_entry(sdata, &local->interfaces, list) {
1632                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1633                                         continue;
1634                                 if (!ieee80211_sdata_running(sdata))
1635                                         continue;
1636                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1637                                 goto out_unlock;
1638                         }
1639                 }
1640                 /* fall through */
1641         default:
1642                 /* assign a new address if possible -- try n_addresses first */
1643                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1644                         bool used = false;
1645 
1646                         list_for_each_entry(sdata, &local->interfaces, list) {
1647                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1648                                                      sdata->vif.addr)) {
1649                                         used = true;
1650                                         break;
1651                                 }
1652                         }
1653 
1654                         if (!used) {
1655                                 memcpy(perm_addr,
1656                                        local->hw.wiphy->addresses[i].addr,
1657                                        ETH_ALEN);
1658                                 break;
1659                         }
1660                 }
1661 
1662                 /* try mask if available */
1663                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1664                         break;
1665 
1666                 m = local->hw.wiphy->addr_mask;
1667                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1668                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1669                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1670 
1671                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1672                         /* not a contiguous mask ... not handled now! */
1673                         pr_info("not contiguous\n");
1674                         break;
1675                 }
1676 
1677                 /*
1678                  * Pick address of existing interface in case user changed
1679                  * MAC address manually, default to perm_addr.
1680                  */
1681                 m = local->hw.wiphy->perm_addr;
1682                 list_for_each_entry(sdata, &local->interfaces, list) {
1683                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1684                                 continue;
1685                         m = sdata->vif.addr;
1686                         break;
1687                 }
1688                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1689                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1690                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1691 
1692                 inc = 1ULL<<__ffs64(mask);
1693                 val = (start & mask);
1694                 addr = (start & ~mask) | (val & mask);
1695                 do {
1696                         bool used = false;
1697 
1698                         tmp_addr[5] = addr >> 0*8;
1699                         tmp_addr[4] = addr >> 1*8;
1700                         tmp_addr[3] = addr >> 2*8;
1701                         tmp_addr[2] = addr >> 3*8;
1702                         tmp_addr[1] = addr >> 4*8;
1703                         tmp_addr[0] = addr >> 5*8;
1704 
1705                         val += inc;
1706 
1707                         list_for_each_entry(sdata, &local->interfaces, list) {
1708                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1709                                         used = true;
1710                                         break;
1711                                 }
1712                         }
1713 
1714                         if (!used) {
1715                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1716                                 break;
1717                         }
1718                         addr = (start & ~mask) | (val & mask);
1719                 } while (addr != start);
1720 
1721                 break;
1722         }
1723 
1724  out_unlock:
1725         mutex_unlock(&local->iflist_mtx);
1726 }
1727 
1728 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1729                      unsigned char name_assign_type,
1730                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1731                      struct vif_params *params)
1732 {
1733         struct net_device *ndev = NULL;
1734         struct ieee80211_sub_if_data *sdata = NULL;
1735         struct txq_info *txqi;
1736         void (*if_setup)(struct net_device *dev);
1737         int ret, i;
1738         int txqs = 1;
1739 
1740         ASSERT_RTNL();
1741 
1742         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1743                 struct wireless_dev *wdev;
1744 
1745                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1746                                 GFP_KERNEL);
1747                 if (!sdata)
1748                         return -ENOMEM;
1749                 wdev = &sdata->wdev;
1750 
1751                 sdata->dev = NULL;
1752                 strlcpy(sdata->name, name, IFNAMSIZ);
1753                 ieee80211_assign_perm_addr(local, wdev->address, type);
1754                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1755         } else {
1756                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1757                                  sizeof(void *));
1758                 int txq_size = 0;
1759 
1760                 if (local->ops->wake_tx_queue &&
1761                     type != NL80211_IFTYPE_AP_VLAN &&
1762                     (type != NL80211_IFTYPE_MONITOR ||
1763                      (params->flags & MONITOR_FLAG_ACTIVE)))
1764                         txq_size += sizeof(struct txq_info) +
1765                                     local->hw.txq_data_size;
1766 
1767                 if (local->ops->wake_tx_queue)
1768                         if_setup = ieee80211_if_setup_no_queue;
1769                 else
1770                         if_setup = ieee80211_if_setup;
1771 
1772                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1773                         txqs = IEEE80211_NUM_ACS;
1774 
1775                 ndev = alloc_netdev_mqs(size + txq_size,
1776                                         name, name_assign_type,
1777                                         if_setup, txqs, 1);
1778                 if (!ndev)
1779                         return -ENOMEM;
1780                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1781 
1782                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1783                 if (!ndev->tstats) {
1784                         free_netdev(ndev);
1785                         return -ENOMEM;
1786                 }
1787 
1788                 ndev->needed_headroom = local->tx_headroom +
1789                                         4*6 /* four MAC addresses */
1790                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1791                                         + 6 /* mesh */
1792                                         + 8 /* rfc1042/bridge tunnel */
1793                                         - ETH_HLEN /* ethernet hard_header_len */
1794                                         + IEEE80211_ENCRYPT_HEADROOM;
1795                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1796 
1797                 ret = dev_alloc_name(ndev, ndev->name);
1798                 if (ret < 0) {
1799                         ieee80211_if_free(ndev);
1800                         free_netdev(ndev);
1801                         return ret;
1802                 }
1803 
1804                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1805                 if (is_valid_ether_addr(params->macaddr))
1806                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1807                 else
1808                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1809                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1810 
1811                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1812                 sdata = netdev_priv(ndev);
1813                 ndev->ieee80211_ptr = &sdata->wdev;
1814                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1815                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1816 
1817                 if (txq_size) {
1818                         txqi = netdev_priv(ndev) + size;
1819                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1820                 }
1821 
1822                 sdata->dev = ndev;
1823         }
1824 
1825         /* initialise type-independent data */
1826         sdata->wdev.wiphy = local->hw.wiphy;
1827         sdata->local = local;
1828 
1829         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1830                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1831 
1832         INIT_LIST_HEAD(&sdata->key_list);
1833 
1834         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1835                           ieee80211_dfs_cac_timer_work);
1836         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1837                           ieee80211_delayed_tailroom_dec);
1838 
1839         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1840                 struct ieee80211_supported_band *sband;
1841                 sband = local->hw.wiphy->bands[i];
1842                 sdata->rc_rateidx_mask[i] =
1843                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1844                 if (sband) {
1845                         __le16 cap;
1846                         u16 *vht_rate_mask;
1847 
1848                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1849                                sband->ht_cap.mcs.rx_mask,
1850                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1851 
1852                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1853                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1854                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1855                 } else {
1856                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1857                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1858                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1859                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1860                 }
1861         }
1862 
1863         ieee80211_set_default_queues(sdata);
1864 
1865         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1866         sdata->user_power_level = local->user_power_level;
1867 
1868         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1869 
1870         /* setup type-dependent data */
1871         ieee80211_setup_sdata(sdata, type);
1872 
1873         if (ndev) {
1874                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1875                 if (type == NL80211_IFTYPE_STATION)
1876                         sdata->u.mgd.use_4addr = params->use_4addr;
1877 
1878                 ndev->features |= local->hw.netdev_features;
1879 
1880                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1881 
1882                 /* MTU range: 256 - 2304 */
1883                 ndev->min_mtu = 256;
1884                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1885 
1886                 ret = register_netdevice(ndev);
1887                 if (ret) {
1888                         free_netdev(ndev);
1889                         return ret;
1890                 }
1891         }
1892 
1893         mutex_lock(&local->iflist_mtx);
1894         list_add_tail_rcu(&sdata->list, &local->interfaces);
1895         mutex_unlock(&local->iflist_mtx);
1896 
1897         if (new_wdev)
1898                 *new_wdev = &sdata->wdev;
1899 
1900         return 0;
1901 }
1902 
1903 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1904 {
1905         ASSERT_RTNL();
1906 
1907         mutex_lock(&sdata->local->iflist_mtx);
1908         list_del_rcu(&sdata->list);
1909         mutex_unlock(&sdata->local->iflist_mtx);
1910 
1911         synchronize_rcu();
1912 
1913         if (sdata->dev) {
1914                 unregister_netdevice(sdata->dev);
1915         } else {
1916                 cfg80211_unregister_wdev(&sdata->wdev);
1917                 ieee80211_teardown_sdata(sdata);
1918                 kfree(sdata);
1919         }
1920 }
1921 
1922 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1923 {
1924         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1925                 return;
1926         ieee80211_do_stop(sdata, true);
1927 }
1928 
1929 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1930 {
1931         struct ieee80211_sub_if_data *sdata, *tmp;
1932         LIST_HEAD(unreg_list);
1933         LIST_HEAD(wdev_list);
1934 
1935         ASSERT_RTNL();
1936 
1937         /* Before destroying the interfaces, make sure they're all stopped so
1938          * that the hardware is stopped. Otherwise, the driver might still be
1939          * iterating the interfaces during the shutdown, e.g. from a worker
1940          * or from RX processing or similar, and if it does so (using atomic
1941          * iteration) while we're manipulating the list, the iteration will
1942          * crash.
1943          *
1944          * After this, the hardware should be stopped and the driver should
1945          * have stopped all of its activities, so that we can do RCU-unaware
1946          * manipulations of the interface list below.
1947          */
1948         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1949 
1950         WARN(local->open_count, "%s: open count remains %d\n",
1951              wiphy_name(local->hw.wiphy), local->open_count);
1952 
1953         ieee80211_txq_teardown_flows(local);
1954 
1955         mutex_lock(&local->iflist_mtx);
1956         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1957                 list_del(&sdata->list);
1958 
1959                 if (sdata->dev)
1960                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1961                 else
1962                         list_add(&sdata->list, &wdev_list);
1963         }
1964         mutex_unlock(&local->iflist_mtx);
1965         unregister_netdevice_many(&unreg_list);
1966 
1967         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1968                 list_del(&sdata->list);
1969                 cfg80211_unregister_wdev(&sdata->wdev);
1970                 kfree(sdata);
1971         }
1972 }
1973 
1974 static int netdev_notify(struct notifier_block *nb,
1975                          unsigned long state, void *ptr)
1976 {
1977         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1978         struct ieee80211_sub_if_data *sdata;
1979 
1980         if (state != NETDEV_CHANGENAME)
1981                 return NOTIFY_DONE;
1982 
1983         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1984                 return NOTIFY_DONE;
1985 
1986         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1987                 return NOTIFY_DONE;
1988 
1989         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1990         memcpy(sdata->name, dev->name, IFNAMSIZ);
1991         ieee80211_debugfs_rename_netdev(sdata);
1992 
1993         return NOTIFY_OK;
1994 }
1995 
1996 static struct notifier_block mac80211_netdev_notifier = {
1997         .notifier_call = netdev_notify,
1998 };
1999 
2000 int ieee80211_iface_init(void)
2001 {
2002         return register_netdevice_notifier(&mac80211_netdev_notifier);
2003 }
2004 
2005 void ieee80211_iface_exit(void)
2006 {
2007         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2008 }
2009 
2010 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2011 {
2012         if (sdata->vif.type == NL80211_IFTYPE_AP)
2013                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2014         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2015                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2016 }
2017 
2018 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2019 {
2020         if (sdata->vif.type == NL80211_IFTYPE_AP)
2021                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2022         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2023                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2024 }
2025 

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