1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Interface handling
4 *
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright (c) 2016 Intel Deutschland GmbH
11 * Copyright (C) 2018-2023 Intel Corporation
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/kcov.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29
30 /**
31 * DOC: Interface list locking
32 *
33 * The interface list in each struct ieee80211_local is protected
34 * three-fold:
35 *
36 * (1) modifications may only be done under the RTNL
37 * (2) modifications and readers are protected against each other by
38 * the iflist_mtx.
39 * (3) modifications are done in an RCU manner so atomic readers
40 * can traverse the list in RCU-safe blocks.
41 *
42 * As a consequence, reads (traversals) of the list can be protected
43 * by either the RTNL, the iflist_mtx or RCU.
44 */
45
46 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work);
47
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
49 {
50 struct ieee80211_chanctx_conf *chanctx_conf;
51 int power;
52
53 rcu_read_lock();
54 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
55 if (!chanctx_conf) {
56 rcu_read_unlock();
57 return false;
58 }
59
60 power = ieee80211_chandef_max_power(&chanctx_conf->def);
61 rcu_read_unlock();
62
63 if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->deflink.user_power_level);
65
66 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 power = min(power, sdata->deflink.ap_power_level);
68
69 if (power != sdata->vif.bss_conf.txpower) {
70 sdata->vif.bss_conf.txpower = power;
71 ieee80211_hw_config(sdata->local, 0);
72 return true;
73 }
74
75 return false;
76 }
77
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
79 bool update_bss)
80 {
81 if (__ieee80211_recalc_txpower(sdata) ||
82 (update_bss && ieee80211_sdata_running(sdata)))
83 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
84 BSS_CHANGED_TXPOWER);
85 }
86
__ieee80211_idle_off(struct ieee80211_local * local)87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
88 {
89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 return 0;
91
92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 return IEEE80211_CONF_CHANGE_IDLE;
94 }
95
__ieee80211_idle_on(struct ieee80211_local * local)96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
97 {
98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 return 0;
100
101 ieee80211_flush_queues(local, NULL, false);
102
103 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 return IEEE80211_CONF_CHANGE_IDLE;
105 }
106
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 bool force_active)
109 {
110 bool working, scanning, active;
111 unsigned int led_trig_start = 0, led_trig_stop = 0;
112
113 lockdep_assert_held(&local->mtx);
114
115 active = force_active ||
116 !list_empty(&local->chanctx_list) ||
117 local->monitors;
118
119 working = !local->ops->remain_on_channel &&
120 !list_empty(&local->roc_list);
121
122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124
125 if (working || scanning)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129
130 if (active)
131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 else
133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134
135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136
137 if (working || scanning || active)
138 return __ieee80211_idle_off(local);
139 return __ieee80211_idle_on(local);
140 }
141
ieee80211_idle_off(struct ieee80211_local * local)142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 return __ieee80211_recalc_idle(local, true);
145 }
146
ieee80211_recalc_idle(struct ieee80211_local * local)147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149 u32 change = __ieee80211_recalc_idle(local, false);
150 if (change)
151 ieee80211_hw_config(local, change);
152 }
153
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155 bool check_dup)
156 {
157 struct ieee80211_local *local = sdata->local;
158 struct ieee80211_sub_if_data *iter;
159 u64 new, mask, tmp;
160 u8 *m;
161 int ret = 0;
162
163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164 return 0;
165
166 m = addr;
167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171 m = local->hw.wiphy->addr_mask;
172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175
176 if (!check_dup)
177 return ret;
178
179 mutex_lock(&local->iflist_mtx);
180 list_for_each_entry(iter, &local->interfaces, list) {
181 if (iter == sdata)
182 continue;
183
184 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186 continue;
187
188 m = iter->vif.addr;
189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192
193 if ((new & ~mask) != (tmp & ~mask)) {
194 ret = -EINVAL;
195 break;
196 }
197 }
198 mutex_unlock(&local->iflist_mtx);
199
200 return ret;
201 }
202
ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
204 {
205 struct ieee80211_roc_work *roc;
206 struct ieee80211_local *local = sdata->local;
207 struct ieee80211_sub_if_data *scan_sdata;
208 int ret = 0;
209
210 /* To be the most flexible here we want to only limit changing the
211 * address if the specific interface is doing offchannel work or
212 * scanning.
213 */
214 if (netif_carrier_ok(sdata->dev))
215 return -EBUSY;
216
217 mutex_lock(&local->mtx);
218
219 /* First check no ROC work is happening on this iface */
220 list_for_each_entry(roc, &local->roc_list, list) {
221 if (roc->sdata != sdata)
222 continue;
223
224 if (roc->started) {
225 ret = -EBUSY;
226 goto unlock;
227 }
228 }
229
230 /* And if this iface is scanning */
231 if (local->scanning) {
232 scan_sdata = rcu_dereference_protected(local->scan_sdata,
233 lockdep_is_held(&local->mtx));
234 if (sdata == scan_sdata)
235 ret = -EBUSY;
236 }
237
238 switch (sdata->vif.type) {
239 case NL80211_IFTYPE_STATION:
240 case NL80211_IFTYPE_P2P_CLIENT:
241 /* More interface types could be added here but changing the
242 * address while powered makes the most sense in client modes.
243 */
244 break;
245 default:
246 ret = -EOPNOTSUPP;
247 }
248
249 unlock:
250 mutex_unlock(&local->mtx);
251 return ret;
252 }
253
_ieee80211_change_mac(struct ieee80211_sub_if_data * sdata,void * addr)254 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
255 void *addr)
256 {
257 struct ieee80211_local *local = sdata->local;
258 struct sockaddr *sa = addr;
259 bool check_dup = true;
260 bool live = false;
261 int ret;
262
263 if (ieee80211_sdata_running(sdata)) {
264 ret = ieee80211_can_powered_addr_change(sdata);
265 if (ret)
266 return ret;
267
268 live = true;
269 }
270
271 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
272 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
273 check_dup = false;
274
275 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
276 if (ret)
277 return ret;
278
279 if (live)
280 drv_remove_interface(local, sdata);
281 ret = eth_mac_addr(sdata->dev, sa);
282
283 if (ret == 0) {
284 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
285 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
286 }
287
288 /* Regardless of eth_mac_addr() return we still want to add the
289 * interface back. This should not fail...
290 */
291 if (live)
292 WARN_ON(drv_add_interface(local, sdata));
293
294 return ret;
295 }
296
ieee80211_change_mac(struct net_device * dev,void * addr)297 static int ieee80211_change_mac(struct net_device *dev, void *addr)
298 {
299 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
300 struct ieee80211_local *local = sdata->local;
301 int ret;
302
303 /*
304 * This happens during unregistration if there's a bond device
305 * active (maybe other cases?) and we must get removed from it.
306 * But we really don't care anymore if it's not registered now.
307 */
308 if (!dev->ieee80211_ptr->registered)
309 return 0;
310
311 wiphy_lock(local->hw.wiphy);
312 ret = _ieee80211_change_mac(sdata, addr);
313 wiphy_unlock(local->hw.wiphy);
314
315 return ret;
316 }
317
identical_mac_addr_allowed(int type1,int type2)318 static inline int identical_mac_addr_allowed(int type1, int type2)
319 {
320 return type1 == NL80211_IFTYPE_MONITOR ||
321 type2 == NL80211_IFTYPE_MONITOR ||
322 type1 == NL80211_IFTYPE_P2P_DEVICE ||
323 type2 == NL80211_IFTYPE_P2P_DEVICE ||
324 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
325 (type1 == NL80211_IFTYPE_AP_VLAN &&
326 (type2 == NL80211_IFTYPE_AP ||
327 type2 == NL80211_IFTYPE_AP_VLAN));
328 }
329
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)330 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
331 enum nl80211_iftype iftype)
332 {
333 struct ieee80211_local *local = sdata->local;
334 struct ieee80211_sub_if_data *nsdata;
335 int ret;
336
337 ASSERT_RTNL();
338
339 /* we hold the RTNL here so can safely walk the list */
340 list_for_each_entry(nsdata, &local->interfaces, list) {
341 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
342 /*
343 * Only OCB and monitor mode may coexist
344 */
345 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
346 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
347 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
348 nsdata->vif.type == NL80211_IFTYPE_OCB))
349 return -EBUSY;
350
351 /*
352 * Allow only a single IBSS interface to be up at any
353 * time. This is restricted because beacon distribution
354 * cannot work properly if both are in the same IBSS.
355 *
356 * To remove this restriction we'd have to disallow them
357 * from setting the same SSID on different IBSS interfaces
358 * belonging to the same hardware. Then, however, we're
359 * faced with having to adopt two different TSF timers...
360 */
361 if (iftype == NL80211_IFTYPE_ADHOC &&
362 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
363 return -EBUSY;
364 /*
365 * will not add another interface while any channel
366 * switch is active.
367 */
368 if (nsdata->vif.bss_conf.csa_active)
369 return -EBUSY;
370
371 /*
372 * The remaining checks are only performed for interfaces
373 * with the same MAC address.
374 */
375 if (!ether_addr_equal(sdata->vif.addr,
376 nsdata->vif.addr))
377 continue;
378
379 /*
380 * check whether it may have the same address
381 */
382 if (!identical_mac_addr_allowed(iftype,
383 nsdata->vif.type))
384 return -ENOTUNIQ;
385
386 /* No support for VLAN with MLO yet */
387 if (iftype == NL80211_IFTYPE_AP_VLAN &&
388 sdata->wdev.use_4addr &&
389 nsdata->vif.type == NL80211_IFTYPE_AP &&
390 nsdata->vif.valid_links)
391 return -EOPNOTSUPP;
392
393 /*
394 * can only add VLANs to enabled APs
395 */
396 if (iftype == NL80211_IFTYPE_AP_VLAN &&
397 nsdata->vif.type == NL80211_IFTYPE_AP)
398 sdata->bss = &nsdata->u.ap;
399 }
400 }
401
402 mutex_lock(&local->chanctx_mtx);
403 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
404 mutex_unlock(&local->chanctx_mtx);
405 return ret;
406 }
407
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)408 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
409 enum nl80211_iftype iftype)
410 {
411 int n_queues = sdata->local->hw.queues;
412 int i;
413
414 if (iftype == NL80211_IFTYPE_NAN)
415 return 0;
416
417 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
418 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
419 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
420 IEEE80211_INVAL_HW_QUEUE))
421 return -EINVAL;
422 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
423 n_queues))
424 return -EINVAL;
425 }
426 }
427
428 if ((iftype != NL80211_IFTYPE_AP &&
429 iftype != NL80211_IFTYPE_P2P_GO &&
430 iftype != NL80211_IFTYPE_MESH_POINT) ||
431 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
432 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
433 return 0;
434 }
435
436 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
437 return -EINVAL;
438
439 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
440 return -EINVAL;
441
442 return 0;
443 }
444
ieee80211_open(struct net_device * dev)445 static int ieee80211_open(struct net_device *dev)
446 {
447 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
448 int err;
449
450 /* fail early if user set an invalid address */
451 if (!is_valid_ether_addr(dev->dev_addr))
452 return -EADDRNOTAVAIL;
453
454 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
455 if (err)
456 return err;
457
458 wiphy_lock(sdata->local->hw.wiphy);
459 err = ieee80211_do_open(&sdata->wdev, true);
460 wiphy_unlock(sdata->local->hw.wiphy);
461
462 return err;
463 }
464
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)465 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
466 {
467 struct ieee80211_local *local = sdata->local;
468 unsigned long flags;
469 struct sk_buff_head freeq;
470 struct sk_buff *skb, *tmp;
471 u32 hw_reconf_flags = 0;
472 int i, flushed;
473 struct ps_data *ps;
474 struct cfg80211_chan_def chandef;
475 bool cancel_scan;
476 struct cfg80211_nan_func *func;
477
478 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
479 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
480
481 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
482 if (cancel_scan)
483 ieee80211_scan_cancel(local);
484
485 ieee80211_roc_purge(local, sdata);
486
487 switch (sdata->vif.type) {
488 case NL80211_IFTYPE_STATION:
489 ieee80211_mgd_stop(sdata);
490 break;
491 case NL80211_IFTYPE_ADHOC:
492 ieee80211_ibss_stop(sdata);
493 break;
494 case NL80211_IFTYPE_MONITOR:
495 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
496 break;
497 list_del_rcu(&sdata->u.mntr.list);
498 break;
499 default:
500 break;
501 }
502
503 /*
504 * Remove all stations associated with this interface.
505 *
506 * This must be done before calling ops->remove_interface()
507 * because otherwise we can later invoke ops->sta_notify()
508 * whenever the STAs are removed, and that invalidates driver
509 * assumptions about always getting a vif pointer that is valid
510 * (because if we remove a STA after ops->remove_interface()
511 * the driver will have removed the vif info already!)
512 *
513 * For AP_VLANs stations may exist since there's nothing else that
514 * would have removed them, but in other modes there shouldn't
515 * be any stations.
516 */
517 flushed = sta_info_flush(sdata);
518 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
519
520 /* don't count this interface for allmulti while it is down */
521 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
522 atomic_dec(&local->iff_allmultis);
523
524 if (sdata->vif.type == NL80211_IFTYPE_AP) {
525 local->fif_pspoll--;
526 local->fif_probe_req--;
527 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
528 local->fif_probe_req--;
529 }
530
531 if (sdata->dev) {
532 netif_addr_lock_bh(sdata->dev);
533 spin_lock_bh(&local->filter_lock);
534 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
535 sdata->dev->addr_len);
536 spin_unlock_bh(&local->filter_lock);
537 netif_addr_unlock_bh(sdata->dev);
538 }
539
540 del_timer_sync(&local->dynamic_ps_timer);
541 cancel_work_sync(&local->dynamic_ps_enable_work);
542
543 cancel_work_sync(&sdata->recalc_smps);
544
545 sdata_lock(sdata);
546 WARN(ieee80211_vif_is_mld(&sdata->vif),
547 "destroying interface with valid links 0x%04x\n",
548 sdata->vif.valid_links);
549
550 mutex_lock(&local->mtx);
551 sdata->vif.bss_conf.csa_active = false;
552 if (sdata->vif.type == NL80211_IFTYPE_STATION)
553 sdata->deflink.u.mgd.csa_waiting_bcn = false;
554 if (sdata->deflink.csa_block_tx) {
555 ieee80211_wake_vif_queues(local, sdata,
556 IEEE80211_QUEUE_STOP_REASON_CSA);
557 sdata->deflink.csa_block_tx = false;
558 }
559 mutex_unlock(&local->mtx);
560 sdata_unlock(sdata);
561
562 cancel_work_sync(&sdata->deflink.csa_finalize_work);
563 cancel_work_sync(&sdata->deflink.color_change_finalize_work);
564
565 cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
566
567 if (sdata->wdev.cac_started) {
568 chandef = sdata->vif.bss_conf.chandef;
569 WARN_ON(local->suspended);
570 mutex_lock(&local->mtx);
571 ieee80211_link_release_channel(&sdata->deflink);
572 mutex_unlock(&local->mtx);
573 cfg80211_cac_event(sdata->dev, &chandef,
574 NL80211_RADAR_CAC_ABORTED,
575 GFP_KERNEL);
576 }
577
578 if (sdata->vif.type == NL80211_IFTYPE_AP) {
579 WARN_ON(!list_empty(&sdata->u.ap.vlans));
580 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
581 /* remove all packets in parent bc_buf pointing to this dev */
582 ps = &sdata->bss->ps;
583
584 spin_lock_irqsave(&ps->bc_buf.lock, flags);
585 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
586 if (skb->dev == sdata->dev) {
587 __skb_unlink(skb, &ps->bc_buf);
588 local->total_ps_buffered--;
589 ieee80211_free_txskb(&local->hw, skb);
590 }
591 }
592 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
593 }
594
595 if (going_down)
596 local->open_count--;
597
598 switch (sdata->vif.type) {
599 case NL80211_IFTYPE_AP_VLAN:
600 mutex_lock(&local->mtx);
601 list_del(&sdata->u.vlan.list);
602 mutex_unlock(&local->mtx);
603 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
604 /* see comment in the default case below */
605 ieee80211_free_keys(sdata, true);
606 /* no need to tell driver */
607 break;
608 case NL80211_IFTYPE_MONITOR:
609 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
610 local->cooked_mntrs--;
611 break;
612 }
613
614 local->monitors--;
615 if (local->monitors == 0) {
616 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
617 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
618 }
619
620 ieee80211_adjust_monitor_flags(sdata, -1);
621 break;
622 case NL80211_IFTYPE_NAN:
623 /* clean all the functions */
624 spin_lock_bh(&sdata->u.nan.func_lock);
625
626 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
627 idr_remove(&sdata->u.nan.function_inst_ids, i);
628 cfg80211_free_nan_func(func);
629 }
630 idr_destroy(&sdata->u.nan.function_inst_ids);
631
632 spin_unlock_bh(&sdata->u.nan.func_lock);
633 break;
634 case NL80211_IFTYPE_P2P_DEVICE:
635 /* relies on synchronize_rcu() below */
636 RCU_INIT_POINTER(local->p2p_sdata, NULL);
637 fallthrough;
638 default:
639 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
640 /*
641 * When we get here, the interface is marked down.
642 * Free the remaining keys, if there are any
643 * (which can happen in AP mode if userspace sets
644 * keys before the interface is operating)
645 *
646 * Force the key freeing to always synchronize_net()
647 * to wait for the RX path in case it is using this
648 * interface enqueuing frames at this very time on
649 * another CPU.
650 */
651 ieee80211_free_keys(sdata, true);
652 skb_queue_purge(&sdata->skb_queue);
653 skb_queue_purge(&sdata->status_queue);
654 }
655
656 /*
657 * Since ieee80211_free_txskb() may issue __dev_queue_xmit()
658 * which should be called with interrupts enabled, reclamation
659 * is done in two phases:
660 */
661 __skb_queue_head_init(&freeq);
662
663 /* unlink from local queues... */
664 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
665 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
666 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
667 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
668 if (info->control.vif == &sdata->vif) {
669 __skb_unlink(skb, &local->pending[i]);
670 __skb_queue_tail(&freeq, skb);
671 }
672 }
673 }
674 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
675
676 /* ... and perform actual reclamation with interrupts enabled. */
677 skb_queue_walk_safe(&freeq, skb, tmp) {
678 __skb_unlink(skb, &freeq);
679 ieee80211_free_txskb(&local->hw, skb);
680 }
681
682 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
683 ieee80211_txq_remove_vlan(local, sdata);
684
685 sdata->bss = NULL;
686
687 if (local->open_count == 0)
688 ieee80211_clear_tx_pending(local);
689
690 sdata->vif.bss_conf.beacon_int = 0;
691
692 /*
693 * If the interface goes down while suspended, presumably because
694 * the device was unplugged and that happens before our resume,
695 * then the driver is already unconfigured and the remainder of
696 * this function isn't needed.
697 * XXX: what about WoWLAN? If the device has software state, e.g.
698 * memory allocated, it might expect teardown commands from
699 * mac80211 here?
700 */
701 if (local->suspended) {
702 WARN_ON(local->wowlan);
703 WARN_ON(rcu_access_pointer(local->monitor_sdata));
704 return;
705 }
706
707 switch (sdata->vif.type) {
708 case NL80211_IFTYPE_AP_VLAN:
709 break;
710 case NL80211_IFTYPE_MONITOR:
711 if (local->monitors == 0)
712 ieee80211_del_virtual_monitor(local);
713
714 mutex_lock(&local->mtx);
715 ieee80211_recalc_idle(local);
716 mutex_unlock(&local->mtx);
717
718 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
719 break;
720
721 fallthrough;
722 default:
723 if (going_down)
724 drv_remove_interface(local, sdata);
725 }
726
727 ieee80211_recalc_ps(local);
728
729 if (cancel_scan)
730 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
731
732 if (local->open_count == 0) {
733 ieee80211_stop_device(local);
734
735 /* no reconfiguring after stop! */
736 return;
737 }
738
739 /* do after stop to avoid reconfiguring when we stop anyway */
740 ieee80211_configure_filter(local);
741 ieee80211_hw_config(local, hw_reconf_flags);
742
743 if (local->monitors == local->open_count)
744 ieee80211_add_virtual_monitor(local);
745 }
746
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)747 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
748 {
749 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
750 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
751
752 if (!tx_vif)
753 return;
754
755 tx_sdata = vif_to_sdata(tx_vif);
756 sdata->vif.mbssid_tx_vif = NULL;
757
758 list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
759 &tx_sdata->local->interfaces, list) {
760 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
761 non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
762 ieee80211_sdata_running(non_tx_sdata)) {
763 non_tx_sdata->vif.mbssid_tx_vif = NULL;
764 dev_close(non_tx_sdata->wdev.netdev);
765 }
766 }
767
768 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
769 tx_sdata->vif.mbssid_tx_vif = NULL;
770 dev_close(tx_sdata->wdev.netdev);
771 }
772 }
773
ieee80211_stop(struct net_device * dev)774 static int ieee80211_stop(struct net_device *dev)
775 {
776 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
777
778 /* close dependent VLAN and MBSSID interfaces before locking wiphy */
779 if (sdata->vif.type == NL80211_IFTYPE_AP) {
780 struct ieee80211_sub_if_data *vlan, *tmpsdata;
781
782 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
783 u.vlan.list)
784 dev_close(vlan->dev);
785
786 ieee80211_stop_mbssid(sdata);
787 }
788
789 cancel_work_sync(&sdata->activate_links_work);
790
791 wiphy_lock(sdata->local->hw.wiphy);
792 ieee80211_do_stop(sdata, true);
793 wiphy_unlock(sdata->local->hw.wiphy);
794
795 return 0;
796 }
797
ieee80211_set_multicast_list(struct net_device * dev)798 static void ieee80211_set_multicast_list(struct net_device *dev)
799 {
800 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
801 struct ieee80211_local *local = sdata->local;
802 int allmulti, sdata_allmulti;
803
804 allmulti = !!(dev->flags & IFF_ALLMULTI);
805 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
806
807 if (allmulti != sdata_allmulti) {
808 if (dev->flags & IFF_ALLMULTI)
809 atomic_inc(&local->iff_allmultis);
810 else
811 atomic_dec(&local->iff_allmultis);
812 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
813 }
814
815 spin_lock_bh(&local->filter_lock);
816 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
817 spin_unlock_bh(&local->filter_lock);
818 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
819 }
820
821 /*
822 * Called when the netdev is removed or, by the code below, before
823 * the interface type changes.
824 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)825 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
826 {
827 /* free extra data */
828 ieee80211_free_keys(sdata, false);
829
830 ieee80211_debugfs_remove_netdev(sdata);
831
832 ieee80211_destroy_frag_cache(&sdata->frags);
833
834 if (ieee80211_vif_is_mesh(&sdata->vif))
835 ieee80211_mesh_teardown_sdata(sdata);
836
837 ieee80211_vif_clear_links(sdata);
838 ieee80211_link_stop(&sdata->deflink);
839 }
840
ieee80211_uninit(struct net_device * dev)841 static void ieee80211_uninit(struct net_device *dev)
842 {
843 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
844 }
845
846 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)847 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
848 {
849 dev_fetch_sw_netstats(stats, dev->tstats);
850 }
851
ieee80211_netdev_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)852 static int ieee80211_netdev_setup_tc(struct net_device *dev,
853 enum tc_setup_type type, void *type_data)
854 {
855 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
856 struct ieee80211_local *local = sdata->local;
857
858 return drv_net_setup_tc(local, sdata, dev, type, type_data);
859 }
860
861 static const struct net_device_ops ieee80211_dataif_ops = {
862 .ndo_open = ieee80211_open,
863 .ndo_stop = ieee80211_stop,
864 .ndo_uninit = ieee80211_uninit,
865 .ndo_start_xmit = ieee80211_subif_start_xmit,
866 .ndo_set_rx_mode = ieee80211_set_multicast_list,
867 .ndo_set_mac_address = ieee80211_change_mac,
868 .ndo_get_stats64 = ieee80211_get_stats64,
869 .ndo_setup_tc = ieee80211_netdev_setup_tc,
870 };
871
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)872 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
873 struct sk_buff *skb,
874 struct net_device *sb_dev)
875 {
876 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
877 struct ieee80211_local *local = sdata->local;
878 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
879 struct ieee80211_hdr *hdr;
880 int len_rthdr;
881
882 if (local->hw.queues < IEEE80211_NUM_ACS)
883 return 0;
884
885 /* reset flags and info before parsing radiotap header */
886 memset(info, 0, sizeof(*info));
887
888 if (!ieee80211_parse_tx_radiotap(skb, dev))
889 return 0; /* doesn't matter, frame will be dropped */
890
891 len_rthdr = ieee80211_get_radiotap_len(skb->data);
892 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
893 if (skb->len < len_rthdr + 2 ||
894 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
895 return 0; /* doesn't matter, frame will be dropped */
896
897 return ieee80211_select_queue_80211(sdata, skb, hdr);
898 }
899
900 static const struct net_device_ops ieee80211_monitorif_ops = {
901 .ndo_open = ieee80211_open,
902 .ndo_stop = ieee80211_stop,
903 .ndo_uninit = ieee80211_uninit,
904 .ndo_start_xmit = ieee80211_monitor_start_xmit,
905 .ndo_set_rx_mode = ieee80211_set_multicast_list,
906 .ndo_set_mac_address = ieee80211_change_mac,
907 .ndo_select_queue = ieee80211_monitor_select_queue,
908 .ndo_get_stats64 = ieee80211_get_stats64,
909 };
910
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)911 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
912 struct net_device_path *path)
913 {
914 struct ieee80211_sub_if_data *sdata;
915 struct ieee80211_local *local;
916 struct sta_info *sta;
917 int ret = -ENOENT;
918
919 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
920 local = sdata->local;
921
922 if (!local->ops->net_fill_forward_path)
923 return -EOPNOTSUPP;
924
925 rcu_read_lock();
926 switch (sdata->vif.type) {
927 case NL80211_IFTYPE_AP_VLAN:
928 sta = rcu_dereference(sdata->u.vlan.sta);
929 if (sta)
930 break;
931 if (sdata->wdev.use_4addr)
932 goto out;
933 if (is_multicast_ether_addr(ctx->daddr))
934 goto out;
935 sta = sta_info_get_bss(sdata, ctx->daddr);
936 break;
937 case NL80211_IFTYPE_AP:
938 if (is_multicast_ether_addr(ctx->daddr))
939 goto out;
940 sta = sta_info_get(sdata, ctx->daddr);
941 break;
942 case NL80211_IFTYPE_STATION:
943 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
944 sta = sta_info_get(sdata, ctx->daddr);
945 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
946 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
947 goto out;
948
949 break;
950 }
951 }
952
953 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
954 break;
955 default:
956 goto out;
957 }
958
959 if (!sta)
960 goto out;
961
962 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
963 out:
964 rcu_read_unlock();
965
966 return ret;
967 }
968
969 static const struct net_device_ops ieee80211_dataif_8023_ops = {
970 .ndo_open = ieee80211_open,
971 .ndo_stop = ieee80211_stop,
972 .ndo_uninit = ieee80211_uninit,
973 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
974 .ndo_set_rx_mode = ieee80211_set_multicast_list,
975 .ndo_set_mac_address = ieee80211_change_mac,
976 .ndo_get_stats64 = ieee80211_get_stats64,
977 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
978 .ndo_setup_tc = ieee80211_netdev_setup_tc,
979 };
980
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)981 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
982 {
983 switch (iftype) {
984 /* P2P GO and client are mapped to AP/STATION types */
985 case NL80211_IFTYPE_AP:
986 case NL80211_IFTYPE_STATION:
987 return true;
988 default:
989 return false;
990 }
991 }
992
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)993 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
994 {
995 struct ieee80211_local *local = sdata->local;
996 u32 flags;
997
998 flags = sdata->vif.offload_flags;
999
1000 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
1001 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1002 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
1003
1004 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1005 local->hw.wiphy->frag_threshold != (u32)-1)
1006 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1007
1008 if (local->monitors)
1009 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1010 } else {
1011 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1012 }
1013
1014 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
1015 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1016 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
1017
1018 if (local->monitors &&
1019 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
1020 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1021 } else {
1022 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1023 }
1024
1025 if (sdata->vif.offload_flags == flags)
1026 return false;
1027
1028 sdata->vif.offload_flags = flags;
1029 ieee80211_check_fast_rx_iface(sdata);
1030 return true;
1031 }
1032
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)1033 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1034 {
1035 struct ieee80211_local *local = sdata->local;
1036 struct ieee80211_sub_if_data *bss = sdata;
1037 bool enabled;
1038
1039 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1040 if (!sdata->bss)
1041 return;
1042
1043 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1044 }
1045
1046 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1047 !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1048 return;
1049
1050 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1051 if (sdata->wdev.use_4addr &&
1052 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1053 enabled = false;
1054
1055 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1056 &ieee80211_dataif_ops;
1057 }
1058
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1059 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1060 {
1061 struct ieee80211_local *local = sdata->local;
1062 struct ieee80211_sub_if_data *vsdata;
1063
1064 if (ieee80211_set_sdata_offload_flags(sdata)) {
1065 drv_update_vif_offload(local, sdata);
1066 ieee80211_set_vif_encap_ops(sdata);
1067 }
1068
1069 list_for_each_entry(vsdata, &local->interfaces, list) {
1070 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1071 vsdata->bss != &sdata->u.ap)
1072 continue;
1073
1074 ieee80211_set_vif_encap_ops(vsdata);
1075 }
1076 }
1077
ieee80211_recalc_offload(struct ieee80211_local * local)1078 void ieee80211_recalc_offload(struct ieee80211_local *local)
1079 {
1080 struct ieee80211_sub_if_data *sdata;
1081
1082 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1083 return;
1084
1085 mutex_lock(&local->iflist_mtx);
1086
1087 list_for_each_entry(sdata, &local->interfaces, list) {
1088 if (!ieee80211_sdata_running(sdata))
1089 continue;
1090
1091 ieee80211_recalc_sdata_offload(sdata);
1092 }
1093
1094 mutex_unlock(&local->iflist_mtx);
1095 }
1096
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1097 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1098 const int offset)
1099 {
1100 struct ieee80211_local *local = sdata->local;
1101 u32 flags = sdata->u.mntr.flags;
1102
1103 #define ADJUST(_f, _s) do { \
1104 if (flags & MONITOR_FLAG_##_f) \
1105 local->fif_##_s += offset; \
1106 } while (0)
1107
1108 ADJUST(FCSFAIL, fcsfail);
1109 ADJUST(PLCPFAIL, plcpfail);
1110 ADJUST(CONTROL, control);
1111 ADJUST(CONTROL, pspoll);
1112 ADJUST(OTHER_BSS, other_bss);
1113
1114 #undef ADJUST
1115 }
1116
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1117 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1118 {
1119 struct ieee80211_local *local = sdata->local;
1120 int i;
1121
1122 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1123 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1124 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1125 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1126 sdata->vif.hw_queue[i] = i;
1127 else
1128 sdata->vif.hw_queue[i] = 0;
1129 }
1130 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1131 }
1132
ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1133 static void ieee80211_sdata_init(struct ieee80211_local *local,
1134 struct ieee80211_sub_if_data *sdata)
1135 {
1136 sdata->local = local;
1137
1138 /*
1139 * Initialize the default link, so we can use link_id 0 for non-MLD,
1140 * and that continues to work for non-MLD-aware drivers that use just
1141 * vif.bss_conf instead of vif.link_conf.
1142 *
1143 * Note that we never change this, so if link ID 0 isn't used in an
1144 * MLD connection, we get a separate allocation for it.
1145 */
1146 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1147 }
1148
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1149 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1150 {
1151 struct ieee80211_sub_if_data *sdata;
1152 int ret;
1153
1154 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1155 return 0;
1156
1157 ASSERT_RTNL();
1158 lockdep_assert_wiphy(local->hw.wiphy);
1159
1160 if (local->monitor_sdata)
1161 return 0;
1162
1163 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1164 if (!sdata)
1165 return -ENOMEM;
1166
1167 /* set up data */
1168 sdata->vif.type = NL80211_IFTYPE_MONITOR;
1169 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1170 wiphy_name(local->hw.wiphy));
1171 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1172 mutex_init(&sdata->wdev.mtx);
1173
1174 ieee80211_sdata_init(local, sdata);
1175
1176 ieee80211_set_default_queues(sdata);
1177
1178 ret = drv_add_interface(local, sdata);
1179 if (WARN_ON(ret)) {
1180 /* ok .. stupid driver, it asked for this! */
1181 kfree(sdata);
1182 return ret;
1183 }
1184
1185 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1186
1187 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1188 if (ret) {
1189 kfree(sdata);
1190 return ret;
1191 }
1192
1193 mutex_lock(&local->iflist_mtx);
1194 rcu_assign_pointer(local->monitor_sdata, sdata);
1195 mutex_unlock(&local->iflist_mtx);
1196
1197 sdata_lock(sdata);
1198 mutex_lock(&local->mtx);
1199 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1200 IEEE80211_CHANCTX_EXCLUSIVE);
1201 mutex_unlock(&local->mtx);
1202 sdata_unlock(sdata);
1203 if (ret) {
1204 mutex_lock(&local->iflist_mtx);
1205 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1206 mutex_unlock(&local->iflist_mtx);
1207 synchronize_net();
1208 drv_remove_interface(local, sdata);
1209 mutex_destroy(&sdata->wdev.mtx);
1210 kfree(sdata);
1211 return ret;
1212 }
1213
1214 skb_queue_head_init(&sdata->skb_queue);
1215 skb_queue_head_init(&sdata->status_queue);
1216 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1217
1218 return 0;
1219 }
1220
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1221 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1222 {
1223 struct ieee80211_sub_if_data *sdata;
1224
1225 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1226 return;
1227
1228 ASSERT_RTNL();
1229 lockdep_assert_wiphy(local->hw.wiphy);
1230
1231 mutex_lock(&local->iflist_mtx);
1232
1233 sdata = rcu_dereference_protected(local->monitor_sdata,
1234 lockdep_is_held(&local->iflist_mtx));
1235 if (!sdata) {
1236 mutex_unlock(&local->iflist_mtx);
1237 return;
1238 }
1239
1240 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1241 mutex_unlock(&local->iflist_mtx);
1242
1243 synchronize_net();
1244
1245 sdata_lock(sdata);
1246 mutex_lock(&local->mtx);
1247 ieee80211_link_release_channel(&sdata->deflink);
1248 mutex_unlock(&local->mtx);
1249 sdata_unlock(sdata);
1250
1251 drv_remove_interface(local, sdata);
1252
1253 mutex_destroy(&sdata->wdev.mtx);
1254 kfree(sdata);
1255 }
1256
1257 /*
1258 * NOTE: Be very careful when changing this function, it must NOT return
1259 * an error on interface type changes that have been pre-checked, so most
1260 * checks should be in ieee80211_check_concurrent_iface.
1261 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1262 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1263 {
1264 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1265 struct net_device *dev = wdev->netdev;
1266 struct ieee80211_local *local = sdata->local;
1267 u64 changed = 0;
1268 int res;
1269 u32 hw_reconf_flags = 0;
1270
1271 switch (sdata->vif.type) {
1272 case NL80211_IFTYPE_AP_VLAN: {
1273 struct ieee80211_sub_if_data *master;
1274
1275 if (!sdata->bss)
1276 return -ENOLINK;
1277
1278 mutex_lock(&local->mtx);
1279 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1280 mutex_unlock(&local->mtx);
1281
1282 master = container_of(sdata->bss,
1283 struct ieee80211_sub_if_data, u.ap);
1284 sdata->control_port_protocol =
1285 master->control_port_protocol;
1286 sdata->control_port_no_encrypt =
1287 master->control_port_no_encrypt;
1288 sdata->control_port_over_nl80211 =
1289 master->control_port_over_nl80211;
1290 sdata->control_port_no_preauth =
1291 master->control_port_no_preauth;
1292 sdata->vif.cab_queue = master->vif.cab_queue;
1293 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1294 sizeof(sdata->vif.hw_queue));
1295 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1296
1297 mutex_lock(&local->key_mtx);
1298 sdata->crypto_tx_tailroom_needed_cnt +=
1299 master->crypto_tx_tailroom_needed_cnt;
1300 mutex_unlock(&local->key_mtx);
1301
1302 break;
1303 }
1304 case NL80211_IFTYPE_AP:
1305 sdata->bss = &sdata->u.ap;
1306 break;
1307 case NL80211_IFTYPE_MESH_POINT:
1308 case NL80211_IFTYPE_STATION:
1309 case NL80211_IFTYPE_MONITOR:
1310 case NL80211_IFTYPE_ADHOC:
1311 case NL80211_IFTYPE_P2P_DEVICE:
1312 case NL80211_IFTYPE_OCB:
1313 case NL80211_IFTYPE_NAN:
1314 /* no special treatment */
1315 break;
1316 case NL80211_IFTYPE_UNSPECIFIED:
1317 case NUM_NL80211_IFTYPES:
1318 case NL80211_IFTYPE_P2P_CLIENT:
1319 case NL80211_IFTYPE_P2P_GO:
1320 case NL80211_IFTYPE_WDS:
1321 /* cannot happen */
1322 WARN_ON(1);
1323 break;
1324 }
1325
1326 if (local->open_count == 0) {
1327 /* here we can consider everything in good order (again) */
1328 local->reconfig_failure = false;
1329
1330 res = drv_start(local);
1331 if (res)
1332 goto err_del_bss;
1333 /* we're brought up, everything changes */
1334 hw_reconf_flags = ~0;
1335 ieee80211_led_radio(local, true);
1336 ieee80211_mod_tpt_led_trig(local,
1337 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1338 }
1339
1340 /*
1341 * Copy the hopefully now-present MAC address to
1342 * this interface, if it has the special null one.
1343 */
1344 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1345 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1346 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1347
1348 if (!is_valid_ether_addr(dev->dev_addr)) {
1349 res = -EADDRNOTAVAIL;
1350 goto err_stop;
1351 }
1352 }
1353
1354 switch (sdata->vif.type) {
1355 case NL80211_IFTYPE_AP_VLAN:
1356 /* no need to tell driver, but set carrier and chanctx */
1357 if (sdata->bss->active) {
1358 ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1359 netif_carrier_on(dev);
1360 ieee80211_set_vif_encap_ops(sdata);
1361 } else {
1362 netif_carrier_off(dev);
1363 }
1364 break;
1365 case NL80211_IFTYPE_MONITOR:
1366 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1367 local->cooked_mntrs++;
1368 break;
1369 }
1370
1371 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1372 res = drv_add_interface(local, sdata);
1373 if (res)
1374 goto err_stop;
1375 } else if (local->monitors == 0 && local->open_count == 0) {
1376 res = ieee80211_add_virtual_monitor(local);
1377 if (res)
1378 goto err_stop;
1379 }
1380
1381 /* must be before the call to ieee80211_configure_filter */
1382 local->monitors++;
1383 if (local->monitors == 1) {
1384 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1385 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1386 }
1387
1388 ieee80211_adjust_monitor_flags(sdata, 1);
1389 ieee80211_configure_filter(local);
1390 ieee80211_recalc_offload(local);
1391 mutex_lock(&local->mtx);
1392 ieee80211_recalc_idle(local);
1393 mutex_unlock(&local->mtx);
1394
1395 netif_carrier_on(dev);
1396 break;
1397 default:
1398 if (coming_up) {
1399 ieee80211_del_virtual_monitor(local);
1400 ieee80211_set_sdata_offload_flags(sdata);
1401
1402 res = drv_add_interface(local, sdata);
1403 if (res)
1404 goto err_stop;
1405
1406 ieee80211_set_vif_encap_ops(sdata);
1407 res = ieee80211_check_queues(sdata,
1408 ieee80211_vif_type_p2p(&sdata->vif));
1409 if (res)
1410 goto err_del_interface;
1411 }
1412
1413 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1414 local->fif_pspoll++;
1415 local->fif_probe_req++;
1416
1417 ieee80211_configure_filter(local);
1418 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1419 local->fif_probe_req++;
1420 }
1421
1422 if (sdata->vif.probe_req_reg)
1423 drv_config_iface_filter(local, sdata,
1424 FIF_PROBE_REQ,
1425 FIF_PROBE_REQ);
1426
1427 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1428 sdata->vif.type != NL80211_IFTYPE_NAN)
1429 changed |= ieee80211_reset_erp_info(sdata);
1430 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1431 changed);
1432
1433 switch (sdata->vif.type) {
1434 case NL80211_IFTYPE_STATION:
1435 case NL80211_IFTYPE_ADHOC:
1436 case NL80211_IFTYPE_AP:
1437 case NL80211_IFTYPE_MESH_POINT:
1438 case NL80211_IFTYPE_OCB:
1439 netif_carrier_off(dev);
1440 break;
1441 case NL80211_IFTYPE_P2P_DEVICE:
1442 case NL80211_IFTYPE_NAN:
1443 break;
1444 default:
1445 /* not reached */
1446 WARN_ON(1);
1447 }
1448
1449 /*
1450 * Set default queue parameters so drivers don't
1451 * need to initialise the hardware if the hardware
1452 * doesn't start up with sane defaults.
1453 * Enable QoS for anything but station interfaces.
1454 */
1455 ieee80211_set_wmm_default(&sdata->deflink, true,
1456 sdata->vif.type != NL80211_IFTYPE_STATION);
1457 }
1458
1459 switch (sdata->vif.type) {
1460 case NL80211_IFTYPE_P2P_DEVICE:
1461 rcu_assign_pointer(local->p2p_sdata, sdata);
1462 break;
1463 case NL80211_IFTYPE_MONITOR:
1464 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1465 break;
1466 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1467 break;
1468 default:
1469 break;
1470 }
1471
1472 /*
1473 * set_multicast_list will be invoked by the networking core
1474 * which will check whether any increments here were done in
1475 * error and sync them down to the hardware as filter flags.
1476 */
1477 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1478 atomic_inc(&local->iff_allmultis);
1479
1480 if (coming_up)
1481 local->open_count++;
1482
1483 if (hw_reconf_flags)
1484 ieee80211_hw_config(local, hw_reconf_flags);
1485
1486 ieee80211_recalc_ps(local);
1487
1488 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1489
1490 return 0;
1491 err_del_interface:
1492 drv_remove_interface(local, sdata);
1493 err_stop:
1494 if (!local->open_count)
1495 drv_stop(local);
1496 err_del_bss:
1497 sdata->bss = NULL;
1498 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1499 mutex_lock(&local->mtx);
1500 list_del(&sdata->u.vlan.list);
1501 mutex_unlock(&local->mtx);
1502 }
1503 /* might already be clear but that doesn't matter */
1504 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1505 return res;
1506 }
1507
ieee80211_if_free(struct net_device * dev)1508 static void ieee80211_if_free(struct net_device *dev)
1509 {
1510 free_percpu(dev->tstats);
1511 }
1512
ieee80211_if_setup(struct net_device * dev)1513 static void ieee80211_if_setup(struct net_device *dev)
1514 {
1515 ether_setup(dev);
1516 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1517 dev->priv_flags |= IFF_NO_QUEUE;
1518 dev->netdev_ops = &ieee80211_dataif_ops;
1519 dev->needs_free_netdev = true;
1520 dev->priv_destructor = ieee80211_if_free;
1521 }
1522
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1523 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1524 struct ieee80211_sub_if_data *sdata,
1525 struct sk_buff *skb)
1526 {
1527 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1528
1529 if (ieee80211_is_action(mgmt->frame_control) &&
1530 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1531 struct sta_info *sta;
1532 int len = skb->len;
1533
1534 mutex_lock(&local->sta_mtx);
1535 sta = sta_info_get_bss(sdata, mgmt->sa);
1536 if (sta) {
1537 switch (mgmt->u.action.u.addba_req.action_code) {
1538 case WLAN_ACTION_ADDBA_REQ:
1539 ieee80211_process_addba_request(local, sta,
1540 mgmt, len);
1541 break;
1542 case WLAN_ACTION_ADDBA_RESP:
1543 ieee80211_process_addba_resp(local, sta,
1544 mgmt, len);
1545 break;
1546 case WLAN_ACTION_DELBA:
1547 ieee80211_process_delba(sdata, sta,
1548 mgmt, len);
1549 break;
1550 default:
1551 WARN_ON(1);
1552 break;
1553 }
1554 }
1555 mutex_unlock(&local->sta_mtx);
1556 } else if (ieee80211_is_action(mgmt->frame_control) &&
1557 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1558 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1559 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1560 struct ieee80211_rx_status *status;
1561 enum nl80211_band band;
1562 struct sta_info *sta;
1563 u8 opmode;
1564
1565 status = IEEE80211_SKB_RXCB(skb);
1566 band = status->band;
1567 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1568
1569 mutex_lock(&local->sta_mtx);
1570 sta = sta_info_get_bss(sdata, mgmt->sa);
1571
1572 if (sta)
1573 ieee80211_vht_handle_opmode(sdata,
1574 &sta->deflink,
1575 opmode, band);
1576
1577 mutex_unlock(&local->sta_mtx);
1578 break;
1579 }
1580 case WLAN_VHT_ACTION_GROUPID_MGMT:
1581 ieee80211_process_mu_groups(sdata, &sdata->deflink,
1582 mgmt);
1583 break;
1584 default:
1585 WARN_ON(1);
1586 break;
1587 }
1588 } else if (ieee80211_is_action(mgmt->frame_control) &&
1589 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1590 switch (mgmt->u.action.u.s1g.action_code) {
1591 case WLAN_S1G_TWT_TEARDOWN:
1592 case WLAN_S1G_TWT_SETUP:
1593 ieee80211_s1g_rx_twt_action(sdata, skb);
1594 break;
1595 default:
1596 break;
1597 }
1598 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1599 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1600 ieee80211_sta_rx_queued_ext(sdata, skb);
1601 else
1602 WARN_ON(1);
1603 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1604 struct ieee80211_hdr *hdr = (void *)mgmt;
1605 struct sta_info *sta;
1606
1607 /*
1608 * So the frame isn't mgmt, but frame_control
1609 * is at the right place anyway, of course, so
1610 * the if statement is correct.
1611 *
1612 * Warn if we have other data frame types here,
1613 * they must not get here.
1614 */
1615 WARN_ON(hdr->frame_control &
1616 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1617 WARN_ON(!(hdr->seq_ctrl &
1618 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1619 /*
1620 * This was a fragment of a frame, received while
1621 * a block-ack session was active. That cannot be
1622 * right, so terminate the session.
1623 */
1624 mutex_lock(&local->sta_mtx);
1625 sta = sta_info_get_bss(sdata, mgmt->sa);
1626 if (sta) {
1627 u16 tid = ieee80211_get_tid(hdr);
1628
1629 __ieee80211_stop_rx_ba_session(
1630 sta, tid, WLAN_BACK_RECIPIENT,
1631 WLAN_REASON_QSTA_REQUIRE_SETUP,
1632 true);
1633 }
1634 mutex_unlock(&local->sta_mtx);
1635 } else switch (sdata->vif.type) {
1636 case NL80211_IFTYPE_STATION:
1637 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1638 break;
1639 case NL80211_IFTYPE_ADHOC:
1640 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1641 break;
1642 case NL80211_IFTYPE_MESH_POINT:
1643 if (!ieee80211_vif_is_mesh(&sdata->vif))
1644 break;
1645 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1646 break;
1647 default:
1648 WARN(1, "frame for unexpected interface type");
1649 break;
1650 }
1651 }
1652
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1653 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1654 struct sk_buff *skb)
1655 {
1656 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1657
1658 if (ieee80211_is_action(mgmt->frame_control) &&
1659 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1660 switch (mgmt->u.action.u.s1g.action_code) {
1661 case WLAN_S1G_TWT_TEARDOWN:
1662 case WLAN_S1G_TWT_SETUP:
1663 ieee80211_s1g_status_twt_action(sdata, skb);
1664 break;
1665 default:
1666 break;
1667 }
1668 }
1669 }
1670
ieee80211_iface_work(struct wiphy * wiphy,struct wiphy_work * work)1671 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1672 {
1673 struct ieee80211_sub_if_data *sdata =
1674 container_of(work, struct ieee80211_sub_if_data, work);
1675 struct ieee80211_local *local = sdata->local;
1676 struct sk_buff *skb;
1677
1678 if (!ieee80211_sdata_running(sdata))
1679 return;
1680
1681 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1682 return;
1683
1684 if (!ieee80211_can_run_worker(local))
1685 return;
1686
1687 /* first process frames */
1688 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1689 kcov_remote_start_common(skb_get_kcov_handle(skb));
1690
1691 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1692 ieee80211_process_tdls_channel_switch(sdata, skb);
1693 else
1694 ieee80211_iface_process_skb(local, sdata, skb);
1695
1696 kfree_skb(skb);
1697 kcov_remote_stop();
1698 }
1699
1700 /* process status queue */
1701 while ((skb = skb_dequeue(&sdata->status_queue))) {
1702 kcov_remote_start_common(skb_get_kcov_handle(skb));
1703
1704 ieee80211_iface_process_status(sdata, skb);
1705 kfree_skb(skb);
1706
1707 kcov_remote_stop();
1708 }
1709
1710 /* then other type-dependent work */
1711 switch (sdata->vif.type) {
1712 case NL80211_IFTYPE_STATION:
1713 ieee80211_sta_work(sdata);
1714 break;
1715 case NL80211_IFTYPE_ADHOC:
1716 ieee80211_ibss_work(sdata);
1717 break;
1718 case NL80211_IFTYPE_MESH_POINT:
1719 if (!ieee80211_vif_is_mesh(&sdata->vif))
1720 break;
1721 ieee80211_mesh_work(sdata);
1722 break;
1723 case NL80211_IFTYPE_OCB:
1724 ieee80211_ocb_work(sdata);
1725 break;
1726 default:
1727 break;
1728 }
1729 }
1730
ieee80211_recalc_smps_work(struct work_struct * work)1731 static void ieee80211_recalc_smps_work(struct work_struct *work)
1732 {
1733 struct ieee80211_sub_if_data *sdata =
1734 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1735
1736 ieee80211_recalc_smps(sdata, &sdata->deflink);
1737 }
1738
ieee80211_activate_links_work(struct work_struct * work)1739 static void ieee80211_activate_links_work(struct work_struct *work)
1740 {
1741 struct ieee80211_sub_if_data *sdata =
1742 container_of(work, struct ieee80211_sub_if_data,
1743 activate_links_work);
1744
1745 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1746 }
1747
1748 /*
1749 * Helper function to initialise an interface to a specific type.
1750 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1751 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1752 enum nl80211_iftype type)
1753 {
1754 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1755 0xff, 0xff, 0xff};
1756
1757 /* clear type-dependent unions */
1758 memset(&sdata->u, 0, sizeof(sdata->u));
1759 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1760
1761 /* and set some type-dependent values */
1762 sdata->vif.type = type;
1763 sdata->vif.p2p = false;
1764 sdata->wdev.iftype = type;
1765
1766 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1767 sdata->control_port_no_encrypt = false;
1768 sdata->control_port_over_nl80211 = false;
1769 sdata->control_port_no_preauth = false;
1770 sdata->vif.cfg.idle = true;
1771 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1772
1773 sdata->noack_map = 0;
1774
1775 /* only monitor/p2p-device differ */
1776 if (sdata->dev) {
1777 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1778 sdata->dev->type = ARPHRD_ETHER;
1779 }
1780
1781 skb_queue_head_init(&sdata->skb_queue);
1782 skb_queue_head_init(&sdata->status_queue);
1783 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1784 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1785 INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1786
1787 switch (type) {
1788 case NL80211_IFTYPE_P2P_GO:
1789 type = NL80211_IFTYPE_AP;
1790 sdata->vif.type = type;
1791 sdata->vif.p2p = true;
1792 fallthrough;
1793 case NL80211_IFTYPE_AP:
1794 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1795 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1796 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1797 break;
1798 case NL80211_IFTYPE_P2P_CLIENT:
1799 type = NL80211_IFTYPE_STATION;
1800 sdata->vif.type = type;
1801 sdata->vif.p2p = true;
1802 fallthrough;
1803 case NL80211_IFTYPE_STATION:
1804 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1805 ieee80211_sta_setup_sdata(sdata);
1806 break;
1807 case NL80211_IFTYPE_OCB:
1808 sdata->vif.bss_conf.bssid = bssid_wildcard;
1809 ieee80211_ocb_setup_sdata(sdata);
1810 break;
1811 case NL80211_IFTYPE_ADHOC:
1812 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1813 ieee80211_ibss_setup_sdata(sdata);
1814 break;
1815 case NL80211_IFTYPE_MESH_POINT:
1816 if (ieee80211_vif_is_mesh(&sdata->vif))
1817 ieee80211_mesh_init_sdata(sdata);
1818 break;
1819 case NL80211_IFTYPE_MONITOR:
1820 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1821 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1822 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1823 MONITOR_FLAG_OTHER_BSS;
1824 break;
1825 case NL80211_IFTYPE_NAN:
1826 idr_init(&sdata->u.nan.function_inst_ids);
1827 spin_lock_init(&sdata->u.nan.func_lock);
1828 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1829 break;
1830 case NL80211_IFTYPE_AP_VLAN:
1831 case NL80211_IFTYPE_P2P_DEVICE:
1832 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1833 break;
1834 case NL80211_IFTYPE_UNSPECIFIED:
1835 case NL80211_IFTYPE_WDS:
1836 case NUM_NL80211_IFTYPES:
1837 WARN_ON(1);
1838 break;
1839 }
1840
1841 /* need to do this after the switch so vif.type is correct */
1842 ieee80211_link_setup(&sdata->deflink);
1843
1844 ieee80211_debugfs_add_netdev(sdata);
1845 }
1846
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1847 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1848 enum nl80211_iftype type)
1849 {
1850 struct ieee80211_local *local = sdata->local;
1851 int ret, err;
1852 enum nl80211_iftype internal_type = type;
1853 bool p2p = false;
1854
1855 ASSERT_RTNL();
1856
1857 if (!local->ops->change_interface)
1858 return -EBUSY;
1859
1860 /* for now, don't support changing while links exist */
1861 if (ieee80211_vif_is_mld(&sdata->vif))
1862 return -EBUSY;
1863
1864 switch (sdata->vif.type) {
1865 case NL80211_IFTYPE_AP:
1866 if (!list_empty(&sdata->u.ap.vlans))
1867 return -EBUSY;
1868 break;
1869 case NL80211_IFTYPE_STATION:
1870 case NL80211_IFTYPE_ADHOC:
1871 case NL80211_IFTYPE_OCB:
1872 /*
1873 * Could maybe also all others here?
1874 * Just not sure how that interacts
1875 * with the RX/config path e.g. for
1876 * mesh.
1877 */
1878 break;
1879 default:
1880 return -EBUSY;
1881 }
1882
1883 switch (type) {
1884 case NL80211_IFTYPE_AP:
1885 case NL80211_IFTYPE_STATION:
1886 case NL80211_IFTYPE_ADHOC:
1887 case NL80211_IFTYPE_OCB:
1888 /*
1889 * Could probably support everything
1890 * but here.
1891 */
1892 break;
1893 case NL80211_IFTYPE_P2P_CLIENT:
1894 p2p = true;
1895 internal_type = NL80211_IFTYPE_STATION;
1896 break;
1897 case NL80211_IFTYPE_P2P_GO:
1898 p2p = true;
1899 internal_type = NL80211_IFTYPE_AP;
1900 break;
1901 default:
1902 return -EBUSY;
1903 }
1904
1905 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1906 if (ret)
1907 return ret;
1908
1909 ieee80211_stop_vif_queues(local, sdata,
1910 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1911 /* do_stop will synchronize_rcu() first thing */
1912 ieee80211_do_stop(sdata, false);
1913
1914 ieee80211_teardown_sdata(sdata);
1915
1916 ieee80211_set_sdata_offload_flags(sdata);
1917 ret = drv_change_interface(local, sdata, internal_type, p2p);
1918 if (ret)
1919 type = ieee80211_vif_type_p2p(&sdata->vif);
1920
1921 /*
1922 * Ignore return value here, there's not much we can do since
1923 * the driver changed the interface type internally already.
1924 * The warnings will hopefully make driver authors fix it :-)
1925 */
1926 ieee80211_check_queues(sdata, type);
1927
1928 ieee80211_setup_sdata(sdata, type);
1929 ieee80211_set_vif_encap_ops(sdata);
1930
1931 err = ieee80211_do_open(&sdata->wdev, false);
1932 WARN(err, "type change: do_open returned %d", err);
1933
1934 ieee80211_wake_vif_queues(local, sdata,
1935 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1936 return ret;
1937 }
1938
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1939 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1940 enum nl80211_iftype type)
1941 {
1942 int ret;
1943
1944 ASSERT_RTNL();
1945
1946 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1947 return 0;
1948
1949 if (ieee80211_sdata_running(sdata)) {
1950 ret = ieee80211_runtime_change_iftype(sdata, type);
1951 if (ret)
1952 return ret;
1953 } else {
1954 /* Purge and reset type-dependent state. */
1955 ieee80211_teardown_sdata(sdata);
1956 ieee80211_setup_sdata(sdata, type);
1957 }
1958
1959 /* reset some values that shouldn't be kept across type changes */
1960 if (type == NL80211_IFTYPE_STATION)
1961 sdata->u.mgd.use_4addr = false;
1962
1963 return 0;
1964 }
1965
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1966 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1967 u8 *perm_addr, enum nl80211_iftype type)
1968 {
1969 struct ieee80211_sub_if_data *sdata;
1970 u64 mask, start, addr, val, inc;
1971 u8 *m;
1972 u8 tmp_addr[ETH_ALEN];
1973 int i;
1974
1975 /* default ... something at least */
1976 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1977
1978 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1979 local->hw.wiphy->n_addresses <= 1)
1980 return;
1981
1982 mutex_lock(&local->iflist_mtx);
1983
1984 switch (type) {
1985 case NL80211_IFTYPE_MONITOR:
1986 /* doesn't matter */
1987 break;
1988 case NL80211_IFTYPE_AP_VLAN:
1989 /* match up with an AP interface */
1990 list_for_each_entry(sdata, &local->interfaces, list) {
1991 if (sdata->vif.type != NL80211_IFTYPE_AP)
1992 continue;
1993 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1994 break;
1995 }
1996 /* keep default if no AP interface present */
1997 break;
1998 case NL80211_IFTYPE_P2P_CLIENT:
1999 case NL80211_IFTYPE_P2P_GO:
2000 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
2001 list_for_each_entry(sdata, &local->interfaces, list) {
2002 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
2003 continue;
2004 if (!ieee80211_sdata_running(sdata))
2005 continue;
2006 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
2007 goto out_unlock;
2008 }
2009 }
2010 fallthrough;
2011 default:
2012 /* assign a new address if possible -- try n_addresses first */
2013 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
2014 bool used = false;
2015
2016 list_for_each_entry(sdata, &local->interfaces, list) {
2017 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
2018 sdata->vif.addr)) {
2019 used = true;
2020 break;
2021 }
2022 }
2023
2024 if (!used) {
2025 memcpy(perm_addr,
2026 local->hw.wiphy->addresses[i].addr,
2027 ETH_ALEN);
2028 break;
2029 }
2030 }
2031
2032 /* try mask if available */
2033 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2034 break;
2035
2036 m = local->hw.wiphy->addr_mask;
2037 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2038 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2039 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2040
2041 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2042 /* not a contiguous mask ... not handled now! */
2043 pr_info("not contiguous\n");
2044 break;
2045 }
2046
2047 /*
2048 * Pick address of existing interface in case user changed
2049 * MAC address manually, default to perm_addr.
2050 */
2051 m = local->hw.wiphy->perm_addr;
2052 list_for_each_entry(sdata, &local->interfaces, list) {
2053 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2054 continue;
2055 m = sdata->vif.addr;
2056 break;
2057 }
2058 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2059 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2060 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2061
2062 inc = 1ULL<<__ffs64(mask);
2063 val = (start & mask);
2064 addr = (start & ~mask) | (val & mask);
2065 do {
2066 bool used = false;
2067
2068 tmp_addr[5] = addr >> 0*8;
2069 tmp_addr[4] = addr >> 1*8;
2070 tmp_addr[3] = addr >> 2*8;
2071 tmp_addr[2] = addr >> 3*8;
2072 tmp_addr[1] = addr >> 4*8;
2073 tmp_addr[0] = addr >> 5*8;
2074
2075 val += inc;
2076
2077 list_for_each_entry(sdata, &local->interfaces, list) {
2078 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2079 used = true;
2080 break;
2081 }
2082 }
2083
2084 if (!used) {
2085 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2086 break;
2087 }
2088 addr = (start & ~mask) | (val & mask);
2089 } while (addr != start);
2090
2091 break;
2092 }
2093
2094 out_unlock:
2095 mutex_unlock(&local->iflist_mtx);
2096 }
2097
ieee80211_if_add(struct ieee80211_local * local,const char * name,unsigned char name_assign_type,struct wireless_dev ** new_wdev,enum nl80211_iftype type,struct vif_params * params)2098 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2099 unsigned char name_assign_type,
2100 struct wireless_dev **new_wdev, enum nl80211_iftype type,
2101 struct vif_params *params)
2102 {
2103 struct net_device *ndev = NULL;
2104 struct ieee80211_sub_if_data *sdata = NULL;
2105 struct txq_info *txqi;
2106 int ret, i;
2107
2108 ASSERT_RTNL();
2109
2110 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2111 struct wireless_dev *wdev;
2112
2113 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2114 GFP_KERNEL);
2115 if (!sdata)
2116 return -ENOMEM;
2117 wdev = &sdata->wdev;
2118
2119 sdata->dev = NULL;
2120 strscpy(sdata->name, name, IFNAMSIZ);
2121 ieee80211_assign_perm_addr(local, wdev->address, type);
2122 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2123 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2124 } else {
2125 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2126 sizeof(void *));
2127 int txq_size = 0;
2128
2129 if (type != NL80211_IFTYPE_AP_VLAN &&
2130 (type != NL80211_IFTYPE_MONITOR ||
2131 (params->flags & MONITOR_FLAG_ACTIVE)))
2132 txq_size += sizeof(struct txq_info) +
2133 local->hw.txq_data_size;
2134
2135 ndev = alloc_netdev_mqs(size + txq_size,
2136 name, name_assign_type,
2137 ieee80211_if_setup, 1, 1);
2138 if (!ndev)
2139 return -ENOMEM;
2140
2141 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2142
2143 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2144 if (!ndev->tstats) {
2145 free_netdev(ndev);
2146 return -ENOMEM;
2147 }
2148
2149 ndev->needed_headroom = local->tx_headroom +
2150 4*6 /* four MAC addresses */
2151 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2152 + 6 /* mesh */
2153 + 8 /* rfc1042/bridge tunnel */
2154 - ETH_HLEN /* ethernet hard_header_len */
2155 + IEEE80211_ENCRYPT_HEADROOM;
2156 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2157
2158 ret = dev_alloc_name(ndev, ndev->name);
2159 if (ret < 0) {
2160 ieee80211_if_free(ndev);
2161 free_netdev(ndev);
2162 return ret;
2163 }
2164
2165 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2166 if (is_valid_ether_addr(params->macaddr))
2167 eth_hw_addr_set(ndev, params->macaddr);
2168 else
2169 eth_hw_addr_set(ndev, ndev->perm_addr);
2170 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2171
2172 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2173 sdata = netdev_priv(ndev);
2174 ndev->ieee80211_ptr = &sdata->wdev;
2175 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2176 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2177 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2178
2179 if (txq_size) {
2180 txqi = netdev_priv(ndev) + size;
2181 ieee80211_txq_init(sdata, NULL, txqi, 0);
2182 }
2183
2184 sdata->dev = ndev;
2185 }
2186
2187 /* initialise type-independent data */
2188 sdata->wdev.wiphy = local->hw.wiphy;
2189
2190 ieee80211_sdata_init(local, sdata);
2191
2192 ieee80211_init_frag_cache(&sdata->frags);
2193
2194 INIT_LIST_HEAD(&sdata->key_list);
2195
2196 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2197 ieee80211_delayed_tailroom_dec);
2198
2199 for (i = 0; i < NUM_NL80211_BANDS; i++) {
2200 struct ieee80211_supported_band *sband;
2201 sband = local->hw.wiphy->bands[i];
2202 sdata->rc_rateidx_mask[i] =
2203 sband ? (1 << sband->n_bitrates) - 1 : 0;
2204 if (sband) {
2205 __le16 cap;
2206 u16 *vht_rate_mask;
2207
2208 memcpy(sdata->rc_rateidx_mcs_mask[i],
2209 sband->ht_cap.mcs.rx_mask,
2210 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2211
2212 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2213 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2214 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2215 } else {
2216 memset(sdata->rc_rateidx_mcs_mask[i], 0,
2217 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2218 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2219 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2220 }
2221 }
2222
2223 ieee80211_set_default_queues(sdata);
2224
2225 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2226 sdata->deflink.user_power_level = local->user_power_level;
2227
2228 /* setup type-dependent data */
2229 ieee80211_setup_sdata(sdata, type);
2230
2231 if (ndev) {
2232 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2233 if (type == NL80211_IFTYPE_STATION)
2234 sdata->u.mgd.use_4addr = params->use_4addr;
2235
2236 ndev->features |= local->hw.netdev_features;
2237 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2238 ndev->hw_features |= ndev->features &
2239 MAC80211_SUPPORTED_FEATURES_TX;
2240 sdata->vif.netdev_features = local->hw.netdev_features;
2241
2242 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2243
2244 /* MTU range is normally 256 - 2304, where the upper limit is
2245 * the maximum MSDU size. Monitor interfaces send and receive
2246 * MPDU and A-MSDU frames which may be much larger so we do
2247 * not impose an upper limit in that case.
2248 */
2249 ndev->min_mtu = 256;
2250 if (type == NL80211_IFTYPE_MONITOR)
2251 ndev->max_mtu = 0;
2252 else
2253 ndev->max_mtu = local->hw.max_mtu;
2254
2255 ret = cfg80211_register_netdevice(ndev);
2256 if (ret) {
2257 free_netdev(ndev);
2258 return ret;
2259 }
2260 }
2261
2262 mutex_lock(&local->iflist_mtx);
2263 list_add_tail_rcu(&sdata->list, &local->interfaces);
2264 mutex_unlock(&local->iflist_mtx);
2265
2266 if (new_wdev)
2267 *new_wdev = &sdata->wdev;
2268
2269 return 0;
2270 }
2271
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2272 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2273 {
2274 ASSERT_RTNL();
2275
2276 mutex_lock(&sdata->local->iflist_mtx);
2277 list_del_rcu(&sdata->list);
2278 mutex_unlock(&sdata->local->iflist_mtx);
2279
2280 if (sdata->vif.txq)
2281 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2282
2283 synchronize_rcu();
2284
2285 cfg80211_unregister_wdev(&sdata->wdev);
2286
2287 if (!sdata->dev) {
2288 ieee80211_teardown_sdata(sdata);
2289 kfree(sdata);
2290 }
2291 }
2292
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2293 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2294 {
2295 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2296 return;
2297 ieee80211_do_stop(sdata, true);
2298 }
2299
ieee80211_remove_interfaces(struct ieee80211_local * local)2300 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2301 {
2302 struct ieee80211_sub_if_data *sdata, *tmp;
2303 LIST_HEAD(unreg_list);
2304
2305 ASSERT_RTNL();
2306
2307 /* Before destroying the interfaces, make sure they're all stopped so
2308 * that the hardware is stopped. Otherwise, the driver might still be
2309 * iterating the interfaces during the shutdown, e.g. from a worker
2310 * or from RX processing or similar, and if it does so (using atomic
2311 * iteration) while we're manipulating the list, the iteration will
2312 * crash.
2313 *
2314 * After this, the hardware should be stopped and the driver should
2315 * have stopped all of its activities, so that we can do RCU-unaware
2316 * manipulations of the interface list below.
2317 */
2318 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2319
2320 WARN(local->open_count, "%s: open count remains %d\n",
2321 wiphy_name(local->hw.wiphy), local->open_count);
2322
2323 ieee80211_txq_teardown_flows(local);
2324
2325 mutex_lock(&local->iflist_mtx);
2326 list_splice_init(&local->interfaces, &unreg_list);
2327 mutex_unlock(&local->iflist_mtx);
2328
2329 wiphy_lock(local->hw.wiphy);
2330 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2331 bool netdev = sdata->dev;
2332
2333 /*
2334 * Remove IP addresses explicitly, since the notifier will
2335 * skip the callbacks if wdev->registered is false, since
2336 * we can't acquire the wiphy_lock() again there if already
2337 * inside this locked section.
2338 */
2339 sdata_lock(sdata);
2340 sdata->vif.cfg.arp_addr_cnt = 0;
2341 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2342 sdata->u.mgd.associated)
2343 ieee80211_vif_cfg_change_notify(sdata,
2344 BSS_CHANGED_ARP_FILTER);
2345 sdata_unlock(sdata);
2346
2347 list_del(&sdata->list);
2348 cfg80211_unregister_wdev(&sdata->wdev);
2349
2350 if (!netdev)
2351 kfree(sdata);
2352 }
2353 wiphy_unlock(local->hw.wiphy);
2354 }
2355
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2356 static int netdev_notify(struct notifier_block *nb,
2357 unsigned long state, void *ptr)
2358 {
2359 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2360 struct ieee80211_sub_if_data *sdata;
2361
2362 if (state != NETDEV_CHANGENAME)
2363 return NOTIFY_DONE;
2364
2365 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2366 return NOTIFY_DONE;
2367
2368 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2369 return NOTIFY_DONE;
2370
2371 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2372 memcpy(sdata->name, dev->name, IFNAMSIZ);
2373 ieee80211_debugfs_rename_netdev(sdata);
2374
2375 return NOTIFY_OK;
2376 }
2377
2378 static struct notifier_block mac80211_netdev_notifier = {
2379 .notifier_call = netdev_notify,
2380 };
2381
ieee80211_iface_init(void)2382 int ieee80211_iface_init(void)
2383 {
2384 return register_netdevice_notifier(&mac80211_netdev_notifier);
2385 }
2386
ieee80211_iface_exit(void)2387 void ieee80211_iface_exit(void)
2388 {
2389 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2390 }
2391
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2392 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2393 {
2394 if (sdata->vif.type == NL80211_IFTYPE_AP)
2395 atomic_inc(&sdata->u.ap.num_mcast_sta);
2396 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2397 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2398 }
2399
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2400 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2401 {
2402 if (sdata->vif.type == NL80211_IFTYPE_AP)
2403 atomic_dec(&sdata->u.ap.num_mcast_sta);
2404 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2405 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2406 }
2407