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Merge tag 'mvebu-fixes-4.2-0' of git://git.infradead.org/linux-mvebu into next/late
[deliverable/linux.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/if_arp.h>
17 #include <linux/netdevice.h>
18 #include <linux/rtnetlink.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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
47 {
48 struct ieee80211_chanctx_conf *chanctx_conf;
49 int power;
50
51 rcu_read_lock();
52 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
53 if (!chanctx_conf) {
54 rcu_read_unlock();
55 return false;
56 }
57
58 power = ieee80211_chandef_max_power(&chanctx_conf->def);
59 rcu_read_unlock();
60
61 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
62 power = min(power, sdata->user_power_level);
63
64 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->ap_power_level);
66
67 if (power != sdata->vif.bss_conf.txpower) {
68 sdata->vif.bss_conf.txpower = power;
69 ieee80211_hw_config(sdata->local, 0);
70 return true;
71 }
72
73 return false;
74 }
75
76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
77 bool update_bss)
78 {
79 if (__ieee80211_recalc_txpower(sdata) || update_bss)
80 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
81 }
82
83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
84 {
85 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
86 return 0;
87
88 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
89 return IEEE80211_CONF_CHANGE_IDLE;
90 }
91
92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
93 {
94 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
95 return 0;
96
97 ieee80211_flush_queues(local, NULL, false);
98
99 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
100 return IEEE80211_CONF_CHANGE_IDLE;
101 }
102
103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
104 bool force_active)
105 {
106 bool working, scanning, active;
107 unsigned int led_trig_start = 0, led_trig_stop = 0;
108
109 lockdep_assert_held(&local->mtx);
110
111 active = force_active ||
112 !list_empty(&local->chanctx_list) ||
113 local->monitors;
114
115 working = !local->ops->remain_on_channel &&
116 !list_empty(&local->roc_list);
117
118 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
119 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
120
121 if (working || scanning)
122 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123 else
124 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125
126 if (active)
127 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128 else
129 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130
131 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
132
133 if (working || scanning || active)
134 return __ieee80211_idle_off(local);
135 return __ieee80211_idle_on(local);
136 }
137
138 u32 ieee80211_idle_off(struct ieee80211_local *local)
139 {
140 return __ieee80211_recalc_idle(local, true);
141 }
142
143 void ieee80211_recalc_idle(struct ieee80211_local *local)
144 {
145 u32 change = __ieee80211_recalc_idle(local, false);
146 if (change)
147 ieee80211_hw_config(local, change);
148 }
149
150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
151 {
152 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
153 return -EINVAL;
154
155 dev->mtu = new_mtu;
156 return 0;
157 }
158
159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
160 bool check_dup)
161 {
162 struct ieee80211_local *local = sdata->local;
163 struct ieee80211_sub_if_data *iter;
164 u64 new, mask, tmp;
165 u8 *m;
166 int ret = 0;
167
168 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
169 return 0;
170
171 m = addr;
172 new = ((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 m = local->hw.wiphy->addr_mask;
177 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
178 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
179 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
180
181 if (!check_dup)
182 return ret;
183
184 mutex_lock(&local->iflist_mtx);
185 list_for_each_entry(iter, &local->interfaces, list) {
186 if (iter == sdata)
187 continue;
188
189 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
190 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
191 continue;
192
193 m = iter->vif.addr;
194 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
195 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
196 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
197
198 if ((new & ~mask) != (tmp & ~mask)) {
199 ret = -EINVAL;
200 break;
201 }
202 }
203 mutex_unlock(&local->iflist_mtx);
204
205 return ret;
206 }
207
208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
209 {
210 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
211 struct sockaddr *sa = addr;
212 bool check_dup = true;
213 int ret;
214
215 if (ieee80211_sdata_running(sdata))
216 return -EBUSY;
217
218 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
219 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
220 check_dup = false;
221
222 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
223 if (ret)
224 return ret;
225
226 ret = eth_mac_addr(dev, sa);
227
228 if (ret == 0)
229 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
230
231 return ret;
232 }
233
234 static inline int identical_mac_addr_allowed(int type1, int type2)
235 {
236 return type1 == NL80211_IFTYPE_MONITOR ||
237 type2 == NL80211_IFTYPE_MONITOR ||
238 type1 == NL80211_IFTYPE_P2P_DEVICE ||
239 type2 == NL80211_IFTYPE_P2P_DEVICE ||
240 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
241 (type1 == NL80211_IFTYPE_WDS &&
242 (type2 == NL80211_IFTYPE_WDS ||
243 type2 == NL80211_IFTYPE_AP)) ||
244 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
245 (type1 == NL80211_IFTYPE_AP_VLAN &&
246 (type2 == NL80211_IFTYPE_AP ||
247 type2 == NL80211_IFTYPE_AP_VLAN));
248 }
249
250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
251 enum nl80211_iftype iftype)
252 {
253 struct ieee80211_local *local = sdata->local;
254 struct ieee80211_sub_if_data *nsdata;
255 int ret;
256
257 ASSERT_RTNL();
258
259 /* we hold the RTNL here so can safely walk the list */
260 list_for_each_entry(nsdata, &local->interfaces, list) {
261 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
262 /*
263 * Only OCB and monitor mode may coexist
264 */
265 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
266 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
267 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
268 nsdata->vif.type == NL80211_IFTYPE_OCB))
269 return -EBUSY;
270
271 /*
272 * Allow only a single IBSS interface to be up at any
273 * time. This is restricted because beacon distribution
274 * cannot work properly if both are in the same IBSS.
275 *
276 * To remove this restriction we'd have to disallow them
277 * from setting the same SSID on different IBSS interfaces
278 * belonging to the same hardware. Then, however, we're
279 * faced with having to adopt two different TSF timers...
280 */
281 if (iftype == NL80211_IFTYPE_ADHOC &&
282 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
283 return -EBUSY;
284 /*
285 * will not add another interface while any channel
286 * switch is active.
287 */
288 if (nsdata->vif.csa_active)
289 return -EBUSY;
290
291 /*
292 * The remaining checks are only performed for interfaces
293 * with the same MAC address.
294 */
295 if (!ether_addr_equal(sdata->vif.addr,
296 nsdata->vif.addr))
297 continue;
298
299 /*
300 * check whether it may have the same address
301 */
302 if (!identical_mac_addr_allowed(iftype,
303 nsdata->vif.type))
304 return -ENOTUNIQ;
305
306 /*
307 * can only add VLANs to enabled APs
308 */
309 if (iftype == NL80211_IFTYPE_AP_VLAN &&
310 nsdata->vif.type == NL80211_IFTYPE_AP)
311 sdata->bss = &nsdata->u.ap;
312 }
313 }
314
315 mutex_lock(&local->chanctx_mtx);
316 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
317 mutex_unlock(&local->chanctx_mtx);
318 return ret;
319 }
320
321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
322 enum nl80211_iftype iftype)
323 {
324 int n_queues = sdata->local->hw.queues;
325 int i;
326
327 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
328 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
329 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
330 IEEE80211_INVAL_HW_QUEUE))
331 return -EINVAL;
332 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
333 n_queues))
334 return -EINVAL;
335 }
336 }
337
338 if ((iftype != NL80211_IFTYPE_AP &&
339 iftype != NL80211_IFTYPE_P2P_GO &&
340 iftype != NL80211_IFTYPE_MESH_POINT) ||
341 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
342 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
343 return 0;
344 }
345
346 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
347 return -EINVAL;
348
349 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
350 return -EINVAL;
351
352 return 0;
353 }
354
355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
356 const int offset)
357 {
358 struct ieee80211_local *local = sdata->local;
359 u32 flags = sdata->u.mntr_flags;
360
361 #define ADJUST(_f, _s) do { \
362 if (flags & MONITOR_FLAG_##_f) \
363 local->fif_##_s += offset; \
364 } while (0)
365
366 ADJUST(FCSFAIL, fcsfail);
367 ADJUST(PLCPFAIL, plcpfail);
368 ADJUST(CONTROL, control);
369 ADJUST(CONTROL, pspoll);
370 ADJUST(OTHER_BSS, other_bss);
371
372 #undef ADJUST
373 }
374
375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
376 {
377 struct ieee80211_local *local = sdata->local;
378 int i;
379
380 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
381 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
382 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
383 else if (local->hw.queues >= IEEE80211_NUM_ACS)
384 sdata->vif.hw_queue[i] = i;
385 else
386 sdata->vif.hw_queue[i] = 0;
387 }
388 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
389 }
390
391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
392 {
393 struct ieee80211_sub_if_data *sdata;
394 int ret;
395
396 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
397 return 0;
398
399 ASSERT_RTNL();
400
401 if (local->monitor_sdata)
402 return 0;
403
404 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
405 if (!sdata)
406 return -ENOMEM;
407
408 /* set up data */
409 sdata->local = local;
410 sdata->vif.type = NL80211_IFTYPE_MONITOR;
411 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
412 wiphy_name(local->hw.wiphy));
413 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
414
415 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
416
417 ieee80211_set_default_queues(sdata);
418
419 ret = drv_add_interface(local, sdata);
420 if (WARN_ON(ret)) {
421 /* ok .. stupid driver, it asked for this! */
422 kfree(sdata);
423 return ret;
424 }
425
426 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
427 if (ret) {
428 kfree(sdata);
429 return ret;
430 }
431
432 mutex_lock(&local->iflist_mtx);
433 rcu_assign_pointer(local->monitor_sdata, sdata);
434 mutex_unlock(&local->iflist_mtx);
435
436 mutex_lock(&local->mtx);
437 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
438 IEEE80211_CHANCTX_EXCLUSIVE);
439 mutex_unlock(&local->mtx);
440 if (ret) {
441 mutex_lock(&local->iflist_mtx);
442 RCU_INIT_POINTER(local->monitor_sdata, NULL);
443 mutex_unlock(&local->iflist_mtx);
444 synchronize_net();
445 drv_remove_interface(local, sdata);
446 kfree(sdata);
447 return ret;
448 }
449
450 return 0;
451 }
452
453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
454 {
455 struct ieee80211_sub_if_data *sdata;
456
457 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
458 return;
459
460 ASSERT_RTNL();
461
462 mutex_lock(&local->iflist_mtx);
463
464 sdata = rcu_dereference_protected(local->monitor_sdata,
465 lockdep_is_held(&local->iflist_mtx));
466 if (!sdata) {
467 mutex_unlock(&local->iflist_mtx);
468 return;
469 }
470
471 RCU_INIT_POINTER(local->monitor_sdata, NULL);
472 mutex_unlock(&local->iflist_mtx);
473
474 synchronize_net();
475
476 mutex_lock(&local->mtx);
477 ieee80211_vif_release_channel(sdata);
478 mutex_unlock(&local->mtx);
479
480 drv_remove_interface(local, sdata);
481
482 kfree(sdata);
483 }
484
485 /*
486 * NOTE: Be very careful when changing this function, it must NOT return
487 * an error on interface type changes that have been pre-checked, so most
488 * checks should be in ieee80211_check_concurrent_iface.
489 */
490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
491 {
492 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
493 struct net_device *dev = wdev->netdev;
494 struct ieee80211_local *local = sdata->local;
495 struct sta_info *sta;
496 u32 changed = 0;
497 int res;
498 u32 hw_reconf_flags = 0;
499
500 switch (sdata->vif.type) {
501 case NL80211_IFTYPE_WDS:
502 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
503 return -ENOLINK;
504 break;
505 case NL80211_IFTYPE_AP_VLAN: {
506 struct ieee80211_sub_if_data *master;
507
508 if (!sdata->bss)
509 return -ENOLINK;
510
511 mutex_lock(&local->mtx);
512 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
513 mutex_unlock(&local->mtx);
514
515 master = container_of(sdata->bss,
516 struct ieee80211_sub_if_data, u.ap);
517 sdata->control_port_protocol =
518 master->control_port_protocol;
519 sdata->control_port_no_encrypt =
520 master->control_port_no_encrypt;
521 sdata->vif.cab_queue = master->vif.cab_queue;
522 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
523 sizeof(sdata->vif.hw_queue));
524 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
525
526 mutex_lock(&local->key_mtx);
527 sdata->crypto_tx_tailroom_needed_cnt +=
528 master->crypto_tx_tailroom_needed_cnt;
529 mutex_unlock(&local->key_mtx);
530
531 break;
532 }
533 case NL80211_IFTYPE_AP:
534 sdata->bss = &sdata->u.ap;
535 break;
536 case NL80211_IFTYPE_MESH_POINT:
537 case NL80211_IFTYPE_STATION:
538 case NL80211_IFTYPE_MONITOR:
539 case NL80211_IFTYPE_ADHOC:
540 case NL80211_IFTYPE_P2P_DEVICE:
541 case NL80211_IFTYPE_OCB:
542 /* no special treatment */
543 break;
544 case NL80211_IFTYPE_UNSPECIFIED:
545 case NUM_NL80211_IFTYPES:
546 case NL80211_IFTYPE_P2P_CLIENT:
547 case NL80211_IFTYPE_P2P_GO:
548 /* cannot happen */
549 WARN_ON(1);
550 break;
551 }
552
553 if (local->open_count == 0) {
554 res = drv_start(local);
555 if (res)
556 goto err_del_bss;
557 /* we're brought up, everything changes */
558 hw_reconf_flags = ~0;
559 ieee80211_led_radio(local, true);
560 ieee80211_mod_tpt_led_trig(local,
561 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
562 }
563
564 /*
565 * Copy the hopefully now-present MAC address to
566 * this interface, if it has the special null one.
567 */
568 if (dev && is_zero_ether_addr(dev->dev_addr)) {
569 memcpy(dev->dev_addr,
570 local->hw.wiphy->perm_addr,
571 ETH_ALEN);
572 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
573
574 if (!is_valid_ether_addr(dev->dev_addr)) {
575 res = -EADDRNOTAVAIL;
576 goto err_stop;
577 }
578 }
579
580 switch (sdata->vif.type) {
581 case NL80211_IFTYPE_AP_VLAN:
582 /* no need to tell driver, but set carrier and chanctx */
583 if (rtnl_dereference(sdata->bss->beacon)) {
584 ieee80211_vif_vlan_copy_chanctx(sdata);
585 netif_carrier_on(dev);
586 } else {
587 netif_carrier_off(dev);
588 }
589 break;
590 case NL80211_IFTYPE_MONITOR:
591 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
592 local->cooked_mntrs++;
593 break;
594 }
595
596 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
597 res = drv_add_interface(local, sdata);
598 if (res)
599 goto err_stop;
600 } else if (local->monitors == 0 && local->open_count == 0) {
601 res = ieee80211_add_virtual_monitor(local);
602 if (res)
603 goto err_stop;
604 }
605
606 /* must be before the call to ieee80211_configure_filter */
607 local->monitors++;
608 if (local->monitors == 1) {
609 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
610 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
611 }
612
613 ieee80211_adjust_monitor_flags(sdata, 1);
614 ieee80211_configure_filter(local);
615 mutex_lock(&local->mtx);
616 ieee80211_recalc_idle(local);
617 mutex_unlock(&local->mtx);
618
619 netif_carrier_on(dev);
620 break;
621 default:
622 if (coming_up) {
623 ieee80211_del_virtual_monitor(local);
624
625 res = drv_add_interface(local, sdata);
626 if (res)
627 goto err_stop;
628 res = ieee80211_check_queues(sdata,
629 ieee80211_vif_type_p2p(&sdata->vif));
630 if (res)
631 goto err_del_interface;
632 }
633
634 if (sdata->vif.type == NL80211_IFTYPE_AP) {
635 local->fif_pspoll++;
636 local->fif_probe_req++;
637
638 ieee80211_configure_filter(local);
639 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
640 local->fif_probe_req++;
641 }
642
643 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
644 changed |= ieee80211_reset_erp_info(sdata);
645 ieee80211_bss_info_change_notify(sdata, changed);
646
647 switch (sdata->vif.type) {
648 case NL80211_IFTYPE_STATION:
649 case NL80211_IFTYPE_ADHOC:
650 case NL80211_IFTYPE_AP:
651 case NL80211_IFTYPE_MESH_POINT:
652 case NL80211_IFTYPE_OCB:
653 netif_carrier_off(dev);
654 break;
655 case NL80211_IFTYPE_WDS:
656 case NL80211_IFTYPE_P2P_DEVICE:
657 break;
658 default:
659 /* not reached */
660 WARN_ON(1);
661 }
662
663 /*
664 * set default queue parameters so drivers don't
665 * need to initialise the hardware if the hardware
666 * doesn't start up with sane defaults
667 */
668 ieee80211_set_wmm_default(sdata, true);
669 }
670
671 set_bit(SDATA_STATE_RUNNING, &sdata->state);
672
673 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
674 /* Create STA entry for the WDS peer */
675 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
676 GFP_KERNEL);
677 if (!sta) {
678 res = -ENOMEM;
679 goto err_del_interface;
680 }
681
682 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
683 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
684 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
685
686 res = sta_info_insert(sta);
687 if (res) {
688 /* STA has been freed */
689 goto err_del_interface;
690 }
691
692 rate_control_rate_init(sta);
693 netif_carrier_on(dev);
694 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
695 rcu_assign_pointer(local->p2p_sdata, sdata);
696 }
697
698 /*
699 * set_multicast_list will be invoked by the networking core
700 * which will check whether any increments here were done in
701 * error and sync them down to the hardware as filter flags.
702 */
703 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
704 atomic_inc(&local->iff_allmultis);
705
706 if (sdata->flags & IEEE80211_SDATA_PROMISC)
707 atomic_inc(&local->iff_promiscs);
708
709 if (coming_up)
710 local->open_count++;
711
712 if (hw_reconf_flags)
713 ieee80211_hw_config(local, hw_reconf_flags);
714
715 ieee80211_recalc_ps(local, -1);
716
717 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
718 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
719 /* XXX: for AP_VLAN, actually track AP queues */
720 netif_tx_start_all_queues(dev);
721 } else if (dev) {
722 unsigned long flags;
723 int n_acs = IEEE80211_NUM_ACS;
724 int ac;
725
726 if (local->hw.queues < IEEE80211_NUM_ACS)
727 n_acs = 1;
728
729 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
730 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
731 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
732 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
733 for (ac = 0; ac < n_acs; ac++) {
734 int ac_queue = sdata->vif.hw_queue[ac];
735
736 if (local->queue_stop_reasons[ac_queue] == 0 &&
737 skb_queue_empty(&local->pending[ac_queue]))
738 netif_start_subqueue(dev, ac);
739 }
740 }
741 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
742 }
743
744 return 0;
745 err_del_interface:
746 drv_remove_interface(local, sdata);
747 err_stop:
748 if (!local->open_count)
749 drv_stop(local);
750 err_del_bss:
751 sdata->bss = NULL;
752 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
753 mutex_lock(&local->mtx);
754 list_del(&sdata->u.vlan.list);
755 mutex_unlock(&local->mtx);
756 }
757 /* might already be clear but that doesn't matter */
758 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
759 return res;
760 }
761
762 static int ieee80211_open(struct net_device *dev)
763 {
764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
765 int err;
766
767 /* fail early if user set an invalid address */
768 if (!is_valid_ether_addr(dev->dev_addr))
769 return -EADDRNOTAVAIL;
770
771 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
772 if (err)
773 return err;
774
775 return ieee80211_do_open(&sdata->wdev, true);
776 }
777
778 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
779 bool going_down)
780 {
781 struct ieee80211_local *local = sdata->local;
782 unsigned long flags;
783 struct sk_buff *skb, *tmp;
784 u32 hw_reconf_flags = 0;
785 int i, flushed;
786 struct ps_data *ps;
787 struct cfg80211_chan_def chandef;
788 bool cancel_scan;
789
790 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
791
792 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
793 if (cancel_scan)
794 ieee80211_scan_cancel(local);
795
796 /*
797 * Stop TX on this interface first.
798 */
799 if (sdata->dev)
800 netif_tx_stop_all_queues(sdata->dev);
801
802 ieee80211_roc_purge(local, sdata);
803
804 switch (sdata->vif.type) {
805 case NL80211_IFTYPE_STATION:
806 ieee80211_mgd_stop(sdata);
807 break;
808 case NL80211_IFTYPE_ADHOC:
809 ieee80211_ibss_stop(sdata);
810 break;
811 case NL80211_IFTYPE_AP:
812 cancel_work_sync(&sdata->u.ap.request_smps_work);
813 break;
814 default:
815 break;
816 }
817
818 /*
819 * Remove all stations associated with this interface.
820 *
821 * This must be done before calling ops->remove_interface()
822 * because otherwise we can later invoke ops->sta_notify()
823 * whenever the STAs are removed, and that invalidates driver
824 * assumptions about always getting a vif pointer that is valid
825 * (because if we remove a STA after ops->remove_interface()
826 * the driver will have removed the vif info already!)
827 *
828 * In WDS mode a station must exist here and be flushed, for
829 * AP_VLANs stations may exist since there's nothing else that
830 * would have removed them, but in other modes there shouldn't
831 * be any stations.
832 */
833 flushed = sta_info_flush(sdata);
834 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
835 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
836 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
837
838 /* don't count this interface for promisc/allmulti while it is down */
839 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
840 atomic_dec(&local->iff_allmultis);
841
842 if (sdata->flags & IEEE80211_SDATA_PROMISC)
843 atomic_dec(&local->iff_promiscs);
844
845 if (sdata->vif.type == NL80211_IFTYPE_AP) {
846 local->fif_pspoll--;
847 local->fif_probe_req--;
848 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
849 local->fif_probe_req--;
850 }
851
852 if (sdata->dev) {
853 netif_addr_lock_bh(sdata->dev);
854 spin_lock_bh(&local->filter_lock);
855 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
856 sdata->dev->addr_len);
857 spin_unlock_bh(&local->filter_lock);
858 netif_addr_unlock_bh(sdata->dev);
859 }
860
861 del_timer_sync(&local->dynamic_ps_timer);
862 cancel_work_sync(&local->dynamic_ps_enable_work);
863
864 cancel_work_sync(&sdata->recalc_smps);
865 sdata_lock(sdata);
866 mutex_lock(&local->mtx);
867 sdata->vif.csa_active = false;
868 if (sdata->vif.type == NL80211_IFTYPE_STATION)
869 sdata->u.mgd.csa_waiting_bcn = false;
870 if (sdata->csa_block_tx) {
871 ieee80211_wake_vif_queues(local, sdata,
872 IEEE80211_QUEUE_STOP_REASON_CSA);
873 sdata->csa_block_tx = false;
874 }
875 mutex_unlock(&local->mtx);
876 sdata_unlock(sdata);
877
878 cancel_work_sync(&sdata->csa_finalize_work);
879
880 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
881
882 if (sdata->wdev.cac_started) {
883 chandef = sdata->vif.bss_conf.chandef;
884 WARN_ON(local->suspended);
885 mutex_lock(&local->mtx);
886 ieee80211_vif_release_channel(sdata);
887 mutex_unlock(&local->mtx);
888 cfg80211_cac_event(sdata->dev, &chandef,
889 NL80211_RADAR_CAC_ABORTED,
890 GFP_KERNEL);
891 }
892
893 /* APs need special treatment */
894 if (sdata->vif.type == NL80211_IFTYPE_AP) {
895 struct ieee80211_sub_if_data *vlan, *tmpsdata;
896
897 /* down all dependent devices, that is VLANs */
898 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
899 u.vlan.list)
900 dev_close(vlan->dev);
901 WARN_ON(!list_empty(&sdata->u.ap.vlans));
902 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
903 /* remove all packets in parent bc_buf pointing to this dev */
904 ps = &sdata->bss->ps;
905
906 spin_lock_irqsave(&ps->bc_buf.lock, flags);
907 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
908 if (skb->dev == sdata->dev) {
909 __skb_unlink(skb, &ps->bc_buf);
910 local->total_ps_buffered--;
911 ieee80211_free_txskb(&local->hw, skb);
912 }
913 }
914 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
915 }
916
917 if (going_down)
918 local->open_count--;
919
920 switch (sdata->vif.type) {
921 case NL80211_IFTYPE_AP_VLAN:
922 mutex_lock(&local->mtx);
923 list_del(&sdata->u.vlan.list);
924 mutex_unlock(&local->mtx);
925 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
926 /* see comment in the default case below */
927 ieee80211_free_keys(sdata, true);
928 /* no need to tell driver */
929 break;
930 case NL80211_IFTYPE_MONITOR:
931 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
932 local->cooked_mntrs--;
933 break;
934 }
935
936 local->monitors--;
937 if (local->monitors == 0) {
938 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
939 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
940 }
941
942 ieee80211_adjust_monitor_flags(sdata, -1);
943 break;
944 case NL80211_IFTYPE_P2P_DEVICE:
945 /* relies on synchronize_rcu() below */
946 RCU_INIT_POINTER(local->p2p_sdata, NULL);
947 /* fall through */
948 default:
949 cancel_work_sync(&sdata->work);
950 /*
951 * When we get here, the interface is marked down.
952 * Free the remaining keys, if there are any
953 * (which can happen in AP mode if userspace sets
954 * keys before the interface is operating, and maybe
955 * also in WDS mode)
956 *
957 * Force the key freeing to always synchronize_net()
958 * to wait for the RX path in case it is using this
959 * interface enqueuing frames at this very time on
960 * another CPU.
961 */
962 ieee80211_free_keys(sdata, true);
963 skb_queue_purge(&sdata->skb_queue);
964 }
965
966 sdata->bss = NULL;
967
968 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
969 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
970 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
971 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
972 if (info->control.vif == &sdata->vif) {
973 __skb_unlink(skb, &local->pending[i]);
974 ieee80211_free_txskb(&local->hw, skb);
975 }
976 }
977 }
978 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
979
980 if (sdata->vif.txq) {
981 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
982
983 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
984 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
985 }
986
987 if (local->open_count == 0)
988 ieee80211_clear_tx_pending(local);
989
990 /*
991 * If the interface goes down while suspended, presumably because
992 * the device was unplugged and that happens before our resume,
993 * then the driver is already unconfigured and the remainder of
994 * this function isn't needed.
995 * XXX: what about WoWLAN? If the device has software state, e.g.
996 * memory allocated, it might expect teardown commands from
997 * mac80211 here?
998 */
999 if (local->suspended) {
1000 WARN_ON(local->wowlan);
1001 WARN_ON(rtnl_dereference(local->monitor_sdata));
1002 return;
1003 }
1004
1005 switch (sdata->vif.type) {
1006 case NL80211_IFTYPE_AP_VLAN:
1007 break;
1008 case NL80211_IFTYPE_MONITOR:
1009 if (local->monitors == 0)
1010 ieee80211_del_virtual_monitor(local);
1011
1012 mutex_lock(&local->mtx);
1013 ieee80211_recalc_idle(local);
1014 mutex_unlock(&local->mtx);
1015
1016 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1017 break;
1018
1019 /* fall through */
1020 default:
1021 if (going_down)
1022 drv_remove_interface(local, sdata);
1023 }
1024
1025 ieee80211_recalc_ps(local, -1);
1026
1027 if (cancel_scan)
1028 flush_delayed_work(&local->scan_work);
1029
1030 if (local->open_count == 0) {
1031 ieee80211_stop_device(local);
1032
1033 /* no reconfiguring after stop! */
1034 return;
1035 }
1036
1037 /* do after stop to avoid reconfiguring when we stop anyway */
1038 ieee80211_configure_filter(local);
1039 ieee80211_hw_config(local, hw_reconf_flags);
1040
1041 if (local->monitors == local->open_count)
1042 ieee80211_add_virtual_monitor(local);
1043 }
1044
1045 static int ieee80211_stop(struct net_device *dev)
1046 {
1047 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1048
1049 ieee80211_do_stop(sdata, true);
1050
1051 return 0;
1052 }
1053
1054 static void ieee80211_set_multicast_list(struct net_device *dev)
1055 {
1056 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1057 struct ieee80211_local *local = sdata->local;
1058 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1059
1060 allmulti = !!(dev->flags & IFF_ALLMULTI);
1061 promisc = !!(dev->flags & IFF_PROMISC);
1062 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1063 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1064
1065 if (allmulti != sdata_allmulti) {
1066 if (dev->flags & IFF_ALLMULTI)
1067 atomic_inc(&local->iff_allmultis);
1068 else
1069 atomic_dec(&local->iff_allmultis);
1070 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1071 }
1072
1073 if (promisc != sdata_promisc) {
1074 if (dev->flags & IFF_PROMISC)
1075 atomic_inc(&local->iff_promiscs);
1076 else
1077 atomic_dec(&local->iff_promiscs);
1078 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1079 }
1080 spin_lock_bh(&local->filter_lock);
1081 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1082 spin_unlock_bh(&local->filter_lock);
1083 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1084 }
1085
1086 /*
1087 * Called when the netdev is removed or, by the code below, before
1088 * the interface type changes.
1089 */
1090 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1091 {
1092 int i;
1093
1094 /* free extra data */
1095 ieee80211_free_keys(sdata, false);
1096
1097 ieee80211_debugfs_remove_netdev(sdata);
1098
1099 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1100 __skb_queue_purge(&sdata->fragments[i].skb_list);
1101 sdata->fragment_next = 0;
1102
1103 if (ieee80211_vif_is_mesh(&sdata->vif))
1104 mesh_rmc_free(sdata);
1105 }
1106
1107 static void ieee80211_uninit(struct net_device *dev)
1108 {
1109 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1110 }
1111
1112 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1113 struct sk_buff *skb,
1114 void *accel_priv,
1115 select_queue_fallback_t fallback)
1116 {
1117 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1118 }
1119
1120 static const struct net_device_ops ieee80211_dataif_ops = {
1121 .ndo_open = ieee80211_open,
1122 .ndo_stop = ieee80211_stop,
1123 .ndo_uninit = ieee80211_uninit,
1124 .ndo_start_xmit = ieee80211_subif_start_xmit,
1125 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1126 .ndo_change_mtu = ieee80211_change_mtu,
1127 .ndo_set_mac_address = ieee80211_change_mac,
1128 .ndo_select_queue = ieee80211_netdev_select_queue,
1129 };
1130
1131 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1132 struct sk_buff *skb,
1133 void *accel_priv,
1134 select_queue_fallback_t fallback)
1135 {
1136 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1137 struct ieee80211_local *local = sdata->local;
1138 struct ieee80211_hdr *hdr;
1139 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1140
1141 if (local->hw.queues < IEEE80211_NUM_ACS)
1142 return 0;
1143
1144 if (skb->len < 4 ||
1145 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1146 return 0; /* doesn't matter, frame will be dropped */
1147
1148 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1149
1150 return ieee80211_select_queue_80211(sdata, skb, hdr);
1151 }
1152
1153 static const struct net_device_ops ieee80211_monitorif_ops = {
1154 .ndo_open = ieee80211_open,
1155 .ndo_stop = ieee80211_stop,
1156 .ndo_uninit = ieee80211_uninit,
1157 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1158 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1159 .ndo_change_mtu = ieee80211_change_mtu,
1160 .ndo_set_mac_address = ieee80211_change_mac,
1161 .ndo_select_queue = ieee80211_monitor_select_queue,
1162 };
1163
1164 static void ieee80211_if_setup(struct net_device *dev)
1165 {
1166 ether_setup(dev);
1167 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1168 dev->netdev_ops = &ieee80211_dataif_ops;
1169 dev->destructor = free_netdev;
1170 }
1171
1172 static void ieee80211_iface_work(struct work_struct *work)
1173 {
1174 struct ieee80211_sub_if_data *sdata =
1175 container_of(work, struct ieee80211_sub_if_data, work);
1176 struct ieee80211_local *local = sdata->local;
1177 struct sk_buff *skb;
1178 struct sta_info *sta;
1179 struct ieee80211_ra_tid *ra_tid;
1180 struct ieee80211_rx_agg *rx_agg;
1181
1182 if (!ieee80211_sdata_running(sdata))
1183 return;
1184
1185 if (local->scanning)
1186 return;
1187
1188 if (!ieee80211_can_run_worker(local))
1189 return;
1190
1191 /* first process frames */
1192 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1193 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1194
1195 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1196 ra_tid = (void *)&skb->cb;
1197 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1198 ra_tid->tid);
1199 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1200 ra_tid = (void *)&skb->cb;
1201 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1202 ra_tid->tid);
1203 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1204 rx_agg = (void *)&skb->cb;
1205 mutex_lock(&local->sta_mtx);
1206 sta = sta_info_get_bss(sdata, rx_agg->addr);
1207 if (sta)
1208 __ieee80211_start_rx_ba_session(sta,
1209 0, 0, 0, 1, rx_agg->tid,
1210 IEEE80211_MAX_AMPDU_BUF,
1211 false, true);
1212 mutex_unlock(&local->sta_mtx);
1213 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1214 rx_agg = (void *)&skb->cb;
1215 mutex_lock(&local->sta_mtx);
1216 sta = sta_info_get_bss(sdata, rx_agg->addr);
1217 if (sta)
1218 __ieee80211_stop_rx_ba_session(sta,
1219 rx_agg->tid,
1220 WLAN_BACK_RECIPIENT, 0,
1221 false);
1222 mutex_unlock(&local->sta_mtx);
1223 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1224 ieee80211_process_tdls_channel_switch(sdata, skb);
1225 } else if (ieee80211_is_action(mgmt->frame_control) &&
1226 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1227 int len = skb->len;
1228
1229 mutex_lock(&local->sta_mtx);
1230 sta = sta_info_get_bss(sdata, mgmt->sa);
1231 if (sta) {
1232 switch (mgmt->u.action.u.addba_req.action_code) {
1233 case WLAN_ACTION_ADDBA_REQ:
1234 ieee80211_process_addba_request(
1235 local, sta, mgmt, len);
1236 break;
1237 case WLAN_ACTION_ADDBA_RESP:
1238 ieee80211_process_addba_resp(local, sta,
1239 mgmt, len);
1240 break;
1241 case WLAN_ACTION_DELBA:
1242 ieee80211_process_delba(sdata, sta,
1243 mgmt, len);
1244 break;
1245 default:
1246 WARN_ON(1);
1247 break;
1248 }
1249 }
1250 mutex_unlock(&local->sta_mtx);
1251 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1252 struct ieee80211_hdr *hdr = (void *)mgmt;
1253 /*
1254 * So the frame isn't mgmt, but frame_control
1255 * is at the right place anyway, of course, so
1256 * the if statement is correct.
1257 *
1258 * Warn if we have other data frame types here,
1259 * they must not get here.
1260 */
1261 WARN_ON(hdr->frame_control &
1262 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1263 WARN_ON(!(hdr->seq_ctrl &
1264 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1265 /*
1266 * This was a fragment of a frame, received while
1267 * a block-ack session was active. That cannot be
1268 * right, so terminate the session.
1269 */
1270 mutex_lock(&local->sta_mtx);
1271 sta = sta_info_get_bss(sdata, mgmt->sa);
1272 if (sta) {
1273 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1274 IEEE80211_QOS_CTL_TID_MASK;
1275
1276 __ieee80211_stop_rx_ba_session(
1277 sta, tid, WLAN_BACK_RECIPIENT,
1278 WLAN_REASON_QSTA_REQUIRE_SETUP,
1279 true);
1280 }
1281 mutex_unlock(&local->sta_mtx);
1282 } else switch (sdata->vif.type) {
1283 case NL80211_IFTYPE_STATION:
1284 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1285 break;
1286 case NL80211_IFTYPE_ADHOC:
1287 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1288 break;
1289 case NL80211_IFTYPE_MESH_POINT:
1290 if (!ieee80211_vif_is_mesh(&sdata->vif))
1291 break;
1292 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1293 break;
1294 default:
1295 WARN(1, "frame for unexpected interface type");
1296 break;
1297 }
1298
1299 kfree_skb(skb);
1300 }
1301
1302 /* then other type-dependent work */
1303 switch (sdata->vif.type) {
1304 case NL80211_IFTYPE_STATION:
1305 ieee80211_sta_work(sdata);
1306 break;
1307 case NL80211_IFTYPE_ADHOC:
1308 ieee80211_ibss_work(sdata);
1309 break;
1310 case NL80211_IFTYPE_MESH_POINT:
1311 if (!ieee80211_vif_is_mesh(&sdata->vif))
1312 break;
1313 ieee80211_mesh_work(sdata);
1314 break;
1315 case NL80211_IFTYPE_OCB:
1316 ieee80211_ocb_work(sdata);
1317 break;
1318 default:
1319 break;
1320 }
1321 }
1322
1323 static void ieee80211_recalc_smps_work(struct work_struct *work)
1324 {
1325 struct ieee80211_sub_if_data *sdata =
1326 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1327
1328 ieee80211_recalc_smps(sdata);
1329 }
1330
1331 /*
1332 * Helper function to initialise an interface to a specific type.
1333 */
1334 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1335 enum nl80211_iftype type)
1336 {
1337 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1338 0xff, 0xff, 0xff};
1339
1340 /* clear type-dependent union */
1341 memset(&sdata->u, 0, sizeof(sdata->u));
1342
1343 /* and set some type-dependent values */
1344 sdata->vif.type = type;
1345 sdata->vif.p2p = false;
1346 sdata->wdev.iftype = type;
1347
1348 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1349 sdata->control_port_no_encrypt = false;
1350 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1351 sdata->vif.bss_conf.idle = true;
1352
1353 sdata->noack_map = 0;
1354
1355 /* only monitor/p2p-device differ */
1356 if (sdata->dev) {
1357 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1358 sdata->dev->type = ARPHRD_ETHER;
1359 }
1360
1361 skb_queue_head_init(&sdata->skb_queue);
1362 INIT_WORK(&sdata->work, ieee80211_iface_work);
1363 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1364 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1365 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1366 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1367
1368 switch (type) {
1369 case NL80211_IFTYPE_P2P_GO:
1370 type = NL80211_IFTYPE_AP;
1371 sdata->vif.type = type;
1372 sdata->vif.p2p = true;
1373 /* fall through */
1374 case NL80211_IFTYPE_AP:
1375 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1376 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1377 INIT_WORK(&sdata->u.ap.request_smps_work,
1378 ieee80211_request_smps_ap_work);
1379 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1380 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1381 break;
1382 case NL80211_IFTYPE_P2P_CLIENT:
1383 type = NL80211_IFTYPE_STATION;
1384 sdata->vif.type = type;
1385 sdata->vif.p2p = true;
1386 /* fall through */
1387 case NL80211_IFTYPE_STATION:
1388 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1389 ieee80211_sta_setup_sdata(sdata);
1390 break;
1391 case NL80211_IFTYPE_OCB:
1392 sdata->vif.bss_conf.bssid = bssid_wildcard;
1393 ieee80211_ocb_setup_sdata(sdata);
1394 break;
1395 case NL80211_IFTYPE_ADHOC:
1396 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1397 ieee80211_ibss_setup_sdata(sdata);
1398 break;
1399 case NL80211_IFTYPE_MESH_POINT:
1400 if (ieee80211_vif_is_mesh(&sdata->vif))
1401 ieee80211_mesh_init_sdata(sdata);
1402 break;
1403 case NL80211_IFTYPE_MONITOR:
1404 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1405 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1406 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1407 MONITOR_FLAG_OTHER_BSS;
1408 break;
1409 case NL80211_IFTYPE_WDS:
1410 sdata->vif.bss_conf.bssid = NULL;
1411 break;
1412 case NL80211_IFTYPE_AP_VLAN:
1413 case NL80211_IFTYPE_P2P_DEVICE:
1414 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1415 break;
1416 case NL80211_IFTYPE_UNSPECIFIED:
1417 case NUM_NL80211_IFTYPES:
1418 BUG();
1419 break;
1420 }
1421
1422 ieee80211_debugfs_add_netdev(sdata);
1423 }
1424
1425 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1426 enum nl80211_iftype type)
1427 {
1428 struct ieee80211_local *local = sdata->local;
1429 int ret, err;
1430 enum nl80211_iftype internal_type = type;
1431 bool p2p = false;
1432
1433 ASSERT_RTNL();
1434
1435 if (!local->ops->change_interface)
1436 return -EBUSY;
1437
1438 switch (sdata->vif.type) {
1439 case NL80211_IFTYPE_AP:
1440 case NL80211_IFTYPE_STATION:
1441 case NL80211_IFTYPE_ADHOC:
1442 case NL80211_IFTYPE_OCB:
1443 /*
1444 * Could maybe also all others here?
1445 * Just not sure how that interacts
1446 * with the RX/config path e.g. for
1447 * mesh.
1448 */
1449 break;
1450 default:
1451 return -EBUSY;
1452 }
1453
1454 switch (type) {
1455 case NL80211_IFTYPE_AP:
1456 case NL80211_IFTYPE_STATION:
1457 case NL80211_IFTYPE_ADHOC:
1458 case NL80211_IFTYPE_OCB:
1459 /*
1460 * Could probably support everything
1461 * but WDS here (WDS do_open can fail
1462 * under memory pressure, which this
1463 * code isn't prepared to handle).
1464 */
1465 break;
1466 case NL80211_IFTYPE_P2P_CLIENT:
1467 p2p = true;
1468 internal_type = NL80211_IFTYPE_STATION;
1469 break;
1470 case NL80211_IFTYPE_P2P_GO:
1471 p2p = true;
1472 internal_type = NL80211_IFTYPE_AP;
1473 break;
1474 default:
1475 return -EBUSY;
1476 }
1477
1478 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1479 if (ret)
1480 return ret;
1481
1482 ieee80211_do_stop(sdata, false);
1483
1484 ieee80211_teardown_sdata(sdata);
1485
1486 ret = drv_change_interface(local, sdata, internal_type, p2p);
1487 if (ret)
1488 type = ieee80211_vif_type_p2p(&sdata->vif);
1489
1490 /*
1491 * Ignore return value here, there's not much we can do since
1492 * the driver changed the interface type internally already.
1493 * The warnings will hopefully make driver authors fix it :-)
1494 */
1495 ieee80211_check_queues(sdata, type);
1496
1497 ieee80211_setup_sdata(sdata, type);
1498
1499 err = ieee80211_do_open(&sdata->wdev, false);
1500 WARN(err, "type change: do_open returned %d", err);
1501
1502 return ret;
1503 }
1504
1505 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1506 enum nl80211_iftype type)
1507 {
1508 int ret;
1509
1510 ASSERT_RTNL();
1511
1512 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1513 return 0;
1514
1515 if (ieee80211_sdata_running(sdata)) {
1516 ret = ieee80211_runtime_change_iftype(sdata, type);
1517 if (ret)
1518 return ret;
1519 } else {
1520 /* Purge and reset type-dependent state. */
1521 ieee80211_teardown_sdata(sdata);
1522 ieee80211_setup_sdata(sdata, type);
1523 }
1524
1525 /* reset some values that shouldn't be kept across type changes */
1526 if (type == NL80211_IFTYPE_STATION)
1527 sdata->u.mgd.use_4addr = false;
1528
1529 return 0;
1530 }
1531
1532 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1533 u8 *perm_addr, enum nl80211_iftype type)
1534 {
1535 struct ieee80211_sub_if_data *sdata;
1536 u64 mask, start, addr, val, inc;
1537 u8 *m;
1538 u8 tmp_addr[ETH_ALEN];
1539 int i;
1540
1541 /* default ... something at least */
1542 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1543
1544 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1545 local->hw.wiphy->n_addresses <= 1)
1546 return;
1547
1548 mutex_lock(&local->iflist_mtx);
1549
1550 switch (type) {
1551 case NL80211_IFTYPE_MONITOR:
1552 /* doesn't matter */
1553 break;
1554 case NL80211_IFTYPE_WDS:
1555 case NL80211_IFTYPE_AP_VLAN:
1556 /* match up with an AP interface */
1557 list_for_each_entry(sdata, &local->interfaces, list) {
1558 if (sdata->vif.type != NL80211_IFTYPE_AP)
1559 continue;
1560 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1561 break;
1562 }
1563 /* keep default if no AP interface present */
1564 break;
1565 case NL80211_IFTYPE_P2P_CLIENT:
1566 case NL80211_IFTYPE_P2P_GO:
1567 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1568 list_for_each_entry(sdata, &local->interfaces, list) {
1569 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1570 continue;
1571 if (!ieee80211_sdata_running(sdata))
1572 continue;
1573 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1574 goto out_unlock;
1575 }
1576 }
1577 /* otherwise fall through */
1578 default:
1579 /* assign a new address if possible -- try n_addresses first */
1580 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1581 bool used = false;
1582
1583 list_for_each_entry(sdata, &local->interfaces, list) {
1584 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1585 sdata->vif.addr)) {
1586 used = true;
1587 break;
1588 }
1589 }
1590
1591 if (!used) {
1592 memcpy(perm_addr,
1593 local->hw.wiphy->addresses[i].addr,
1594 ETH_ALEN);
1595 break;
1596 }
1597 }
1598
1599 /* try mask if available */
1600 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1601 break;
1602
1603 m = local->hw.wiphy->addr_mask;
1604 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1605 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1606 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1607
1608 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1609 /* not a contiguous mask ... not handled now! */
1610 pr_info("not contiguous\n");
1611 break;
1612 }
1613
1614 /*
1615 * Pick address of existing interface in case user changed
1616 * MAC address manually, default to perm_addr.
1617 */
1618 m = local->hw.wiphy->perm_addr;
1619 list_for_each_entry(sdata, &local->interfaces, list) {
1620 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1621 continue;
1622 m = sdata->vif.addr;
1623 break;
1624 }
1625 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1626 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1627 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1628
1629 inc = 1ULL<<__ffs64(mask);
1630 val = (start & mask);
1631 addr = (start & ~mask) | (val & mask);
1632 do {
1633 bool used = false;
1634
1635 tmp_addr[5] = addr >> 0*8;
1636 tmp_addr[4] = addr >> 1*8;
1637 tmp_addr[3] = addr >> 2*8;
1638 tmp_addr[2] = addr >> 3*8;
1639 tmp_addr[1] = addr >> 4*8;
1640 tmp_addr[0] = addr >> 5*8;
1641
1642 val += inc;
1643
1644 list_for_each_entry(sdata, &local->interfaces, list) {
1645 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1646 used = true;
1647 break;
1648 }
1649 }
1650
1651 if (!used) {
1652 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1653 break;
1654 }
1655 addr = (start & ~mask) | (val & mask);
1656 } while (addr != start);
1657
1658 break;
1659 }
1660
1661 out_unlock:
1662 mutex_unlock(&local->iflist_mtx);
1663 }
1664
1665 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1666 unsigned char name_assign_type,
1667 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1668 struct vif_params *params)
1669 {
1670 struct net_device *ndev = NULL;
1671 struct ieee80211_sub_if_data *sdata = NULL;
1672 struct txq_info *txqi;
1673 int ret, i;
1674 int txqs = 1;
1675
1676 ASSERT_RTNL();
1677
1678 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1679 struct wireless_dev *wdev;
1680
1681 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1682 GFP_KERNEL);
1683 if (!sdata)
1684 return -ENOMEM;
1685 wdev = &sdata->wdev;
1686
1687 sdata->dev = NULL;
1688 strlcpy(sdata->name, name, IFNAMSIZ);
1689 ieee80211_assign_perm_addr(local, wdev->address, type);
1690 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1691 } else {
1692 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1693 sizeof(void *));
1694 int txq_size = 0;
1695
1696 if (local->ops->wake_tx_queue)
1697 txq_size += sizeof(struct txq_info) +
1698 local->hw.txq_data_size;
1699
1700 if (local->hw.queues >= IEEE80211_NUM_ACS)
1701 txqs = IEEE80211_NUM_ACS;
1702
1703 ndev = alloc_netdev_mqs(size + txq_size,
1704 name, name_assign_type,
1705 ieee80211_if_setup, txqs, 1);
1706 if (!ndev)
1707 return -ENOMEM;
1708 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1709
1710 ndev->needed_headroom = local->tx_headroom +
1711 4*6 /* four MAC addresses */
1712 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1713 + 6 /* mesh */
1714 + 8 /* rfc1042/bridge tunnel */
1715 - ETH_HLEN /* ethernet hard_header_len */
1716 + IEEE80211_ENCRYPT_HEADROOM;
1717 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1718
1719 ret = dev_alloc_name(ndev, ndev->name);
1720 if (ret < 0) {
1721 free_netdev(ndev);
1722 return ret;
1723 }
1724
1725 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1726 if (params && is_valid_ether_addr(params->macaddr))
1727 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1728 else
1729 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1730 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1731
1732 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1733 sdata = netdev_priv(ndev);
1734 ndev->ieee80211_ptr = &sdata->wdev;
1735 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1736 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1737
1738 if (txq_size) {
1739 txqi = netdev_priv(ndev) + size;
1740 ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1741 }
1742
1743 sdata->dev = ndev;
1744 }
1745
1746 /* initialise type-independent data */
1747 sdata->wdev.wiphy = local->hw.wiphy;
1748 sdata->local = local;
1749
1750 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1751 skb_queue_head_init(&sdata->fragments[i].skb_list);
1752
1753 INIT_LIST_HEAD(&sdata->key_list);
1754
1755 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1756 ieee80211_dfs_cac_timer_work);
1757 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1758 ieee80211_delayed_tailroom_dec);
1759
1760 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1761 struct ieee80211_supported_band *sband;
1762 sband = local->hw.wiphy->bands[i];
1763 sdata->rc_rateidx_mask[i] =
1764 sband ? (1 << sband->n_bitrates) - 1 : 0;
1765 if (sband)
1766 memcpy(sdata->rc_rateidx_mcs_mask[i],
1767 sband->ht_cap.mcs.rx_mask,
1768 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1769 else
1770 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1771 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1772 }
1773
1774 ieee80211_set_default_queues(sdata);
1775
1776 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1777 sdata->user_power_level = local->user_power_level;
1778
1779 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1780
1781 /* setup type-dependent data */
1782 ieee80211_setup_sdata(sdata, type);
1783
1784 if (ndev) {
1785 if (params) {
1786 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1787 if (type == NL80211_IFTYPE_STATION)
1788 sdata->u.mgd.use_4addr = params->use_4addr;
1789 }
1790
1791 ndev->features |= local->hw.netdev_features;
1792
1793 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1794
1795 ret = register_netdevice(ndev);
1796 if (ret) {
1797 free_netdev(ndev);
1798 return ret;
1799 }
1800 }
1801
1802 mutex_lock(&local->iflist_mtx);
1803 list_add_tail_rcu(&sdata->list, &local->interfaces);
1804 mutex_unlock(&local->iflist_mtx);
1805
1806 if (new_wdev)
1807 *new_wdev = &sdata->wdev;
1808
1809 return 0;
1810 }
1811
1812 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1813 {
1814 ASSERT_RTNL();
1815
1816 mutex_lock(&sdata->local->iflist_mtx);
1817 list_del_rcu(&sdata->list);
1818 mutex_unlock(&sdata->local->iflist_mtx);
1819
1820 synchronize_rcu();
1821
1822 if (sdata->dev) {
1823 unregister_netdevice(sdata->dev);
1824 } else {
1825 cfg80211_unregister_wdev(&sdata->wdev);
1826 kfree(sdata);
1827 }
1828 }
1829
1830 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1831 {
1832 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1833 return;
1834 ieee80211_do_stop(sdata, true);
1835 ieee80211_teardown_sdata(sdata);
1836 }
1837
1838 /*
1839 * Remove all interfaces, may only be called at hardware unregistration
1840 * time because it doesn't do RCU-safe list removals.
1841 */
1842 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1843 {
1844 struct ieee80211_sub_if_data *sdata, *tmp;
1845 LIST_HEAD(unreg_list);
1846 LIST_HEAD(wdev_list);
1847
1848 ASSERT_RTNL();
1849
1850 /*
1851 * Close all AP_VLAN interfaces first, as otherwise they
1852 * might be closed while the AP interface they belong to
1853 * is closed, causing unregister_netdevice_many() to crash.
1854 */
1855 list_for_each_entry(sdata, &local->interfaces, list)
1856 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1857 dev_close(sdata->dev);
1858
1859 mutex_lock(&local->iflist_mtx);
1860 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1861 list_del(&sdata->list);
1862
1863 if (sdata->dev)
1864 unregister_netdevice_queue(sdata->dev, &unreg_list);
1865 else
1866 list_add(&sdata->list, &wdev_list);
1867 }
1868 mutex_unlock(&local->iflist_mtx);
1869 unregister_netdevice_many(&unreg_list);
1870
1871 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1872 list_del(&sdata->list);
1873 cfg80211_unregister_wdev(&sdata->wdev);
1874 kfree(sdata);
1875 }
1876 }
1877
1878 static int netdev_notify(struct notifier_block *nb,
1879 unsigned long state, void *ptr)
1880 {
1881 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1882 struct ieee80211_sub_if_data *sdata;
1883
1884 if (state != NETDEV_CHANGENAME)
1885 return NOTIFY_DONE;
1886
1887 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1888 return NOTIFY_DONE;
1889
1890 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1891 return NOTIFY_DONE;
1892
1893 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1894 memcpy(sdata->name, dev->name, IFNAMSIZ);
1895 ieee80211_debugfs_rename_netdev(sdata);
1896
1897 return NOTIFY_OK;
1898 }
1899
1900 static struct notifier_block mac80211_netdev_notifier = {
1901 .notifier_call = netdev_notify,
1902 };
1903
1904 int ieee80211_iface_init(void)
1905 {
1906 return register_netdevice_notifier(&mac80211_netdev_notifier);
1907 }
1908
1909 void ieee80211_iface_exit(void)
1910 {
1911 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1912 }
Linux kernel - Deliverables
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