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
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)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
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
77 {
78 if (__ieee80211_recalc_txpower(sdata))
79 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
80 }
81
__ieee80211_idle_off(struct ieee80211_local * local)82 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
83 {
84 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
85 return 0;
86
87 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
88 return IEEE80211_CONF_CHANGE_IDLE;
89 }
90
__ieee80211_idle_on(struct ieee80211_local * local)91 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
92 {
93 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
94 return 0;
95
96 ieee80211_flush_queues(local, NULL);
97
98 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
99 return IEEE80211_CONF_CHANGE_IDLE;
100 }
101
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
103 bool force_active)
104 {
105 bool working, scanning, active;
106 unsigned int led_trig_start = 0, led_trig_stop = 0;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 working = !local->ops->remain_on_channel &&
115 !list_empty(&local->roc_list);
116
117 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
118 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
119
120 if (working || scanning)
121 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
122 else
123 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124
125 if (active)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129
130 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
131
132 if (working || scanning || active)
133 return __ieee80211_idle_off(local);
134 return __ieee80211_idle_on(local);
135 }
136
ieee80211_idle_off(struct ieee80211_local * local)137 u32 ieee80211_idle_off(struct ieee80211_local *local)
138 {
139 return __ieee80211_recalc_idle(local, true);
140 }
141
ieee80211_recalc_idle(struct ieee80211_local * local)142 void ieee80211_recalc_idle(struct ieee80211_local *local)
143 {
144 u32 change = __ieee80211_recalc_idle(local, false);
145 if (change)
146 ieee80211_hw_config(local, change);
147 }
148
ieee80211_change_mtu(struct net_device * dev,int new_mtu)149 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
150 {
151 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
152 return -EINVAL;
153
154 dev->mtu = new_mtu;
155 return 0;
156 }
157
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)158 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
159 bool check_dup)
160 {
161 struct ieee80211_local *local = sdata->local;
162 struct ieee80211_sub_if_data *iter;
163 u64 new, mask, tmp;
164 u8 *m;
165 int ret = 0;
166
167 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
168 return 0;
169
170 m = addr;
171 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174
175 m = local->hw.wiphy->addr_mask;
176 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
177 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
178 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
179
180 if (!check_dup)
181 return ret;
182
183 mutex_lock(&local->iflist_mtx);
184 list_for_each_entry(iter, &local->interfaces, list) {
185 if (iter == sdata)
186 continue;
187
188 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
189 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
190 continue;
191
192 m = iter->vif.addr;
193 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
194 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
195 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
196
197 if ((new & ~mask) != (tmp & ~mask)) {
198 ret = -EINVAL;
199 break;
200 }
201 }
202 mutex_unlock(&local->iflist_mtx);
203
204 return ret;
205 }
206
ieee80211_change_mac(struct net_device * dev,void * addr)207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
208 {
209 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
210 struct sockaddr *sa = addr;
211 bool check_dup = true;
212 int ret;
213
214 if (ieee80211_sdata_running(sdata))
215 return -EBUSY;
216
217 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
218 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
219 check_dup = false;
220
221 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
222 if (ret)
223 return ret;
224
225 ret = eth_mac_addr(dev, sa);
226
227 if (ret == 0)
228 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
229
230 return ret;
231 }
232
identical_mac_addr_allowed(int type1,int type2)233 static inline int identical_mac_addr_allowed(int type1, int type2)
234 {
235 return type1 == NL80211_IFTYPE_MONITOR ||
236 type2 == NL80211_IFTYPE_MONITOR ||
237 type1 == NL80211_IFTYPE_P2P_DEVICE ||
238 type2 == NL80211_IFTYPE_P2P_DEVICE ||
239 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
240 (type1 == NL80211_IFTYPE_WDS &&
241 (type2 == NL80211_IFTYPE_WDS ||
242 type2 == NL80211_IFTYPE_AP)) ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
244 (type1 == NL80211_IFTYPE_AP_VLAN &&
245 (type2 == NL80211_IFTYPE_AP ||
246 type2 == NL80211_IFTYPE_AP_VLAN));
247 }
248
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)249 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
250 enum nl80211_iftype iftype)
251 {
252 struct ieee80211_local *local = sdata->local;
253 struct ieee80211_sub_if_data *nsdata;
254 int ret;
255
256 ASSERT_RTNL();
257
258 /* we hold the RTNL here so can safely walk the list */
259 list_for_each_entry(nsdata, &local->interfaces, list) {
260 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
261 /*
262 * Allow only a single IBSS interface to be up at any
263 * time. This is restricted because beacon distribution
264 * cannot work properly if both are in the same IBSS.
265 *
266 * To remove this restriction we'd have to disallow them
267 * from setting the same SSID on different IBSS interfaces
268 * belonging to the same hardware. Then, however, we're
269 * faced with having to adopt two different TSF timers...
270 */
271 if (iftype == NL80211_IFTYPE_ADHOC &&
272 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
273 return -EBUSY;
274 /*
275 * will not add another interface while any channel
276 * switch is active.
277 */
278 if (nsdata->vif.csa_active)
279 return -EBUSY;
280
281 /*
282 * The remaining checks are only performed for interfaces
283 * with the same MAC address.
284 */
285 if (!ether_addr_equal(sdata->vif.addr,
286 nsdata->vif.addr))
287 continue;
288
289 /*
290 * check whether it may have the same address
291 */
292 if (!identical_mac_addr_allowed(iftype,
293 nsdata->vif.type))
294 return -ENOTUNIQ;
295
296 /*
297 * can only add VLANs to enabled APs
298 */
299 if (iftype == NL80211_IFTYPE_AP_VLAN &&
300 nsdata->vif.type == NL80211_IFTYPE_AP)
301 sdata->bss = &nsdata->u.ap;
302 }
303 }
304
305 mutex_lock(&local->chanctx_mtx);
306 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
307 mutex_unlock(&local->chanctx_mtx);
308 return ret;
309 }
310
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320 IEEE80211_INVAL_HW_QUEUE))
321 return -EINVAL;
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323 n_queues))
324 return -EINVAL;
325 }
326 }
327
328 if ((iftype != NL80211_IFTYPE_AP &&
329 iftype != NL80211_IFTYPE_P2P_GO &&
330 iftype != NL80211_IFTYPE_MESH_POINT) ||
331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333 return 0;
334 }
335
336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337 return -EINVAL;
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340 return -EINVAL;
341
342 return 0;
343 }
344
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346 const int offset)
347 {
348 struct ieee80211_local *local = sdata->local;
349 u32 flags = sdata->u.mntr_flags;
350
351 #define ADJUST(_f, _s) do { \
352 if (flags & MONITOR_FLAG_##_f) \
353 local->fif_##_s += offset; \
354 } while (0)
355
356 ADJUST(FCSFAIL, fcsfail);
357 ADJUST(PLCPFAIL, plcpfail);
358 ADJUST(CONTROL, control);
359 ADJUST(CONTROL, pspoll);
360 ADJUST(OTHER_BSS, other_bss);
361
362 #undef ADJUST
363 }
364
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367 struct ieee80211_local *local = sdata->local;
368 int i;
369
370 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374 sdata->vif.hw_queue[i] = i;
375 else
376 sdata->vif.hw_queue[i] = 0;
377 }
378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380
ieee80211_add_virtual_monitor(struct ieee80211_local * local)381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383 struct ieee80211_sub_if_data *sdata;
384 int ret;
385
386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387 return 0;
388
389 ASSERT_RTNL();
390
391 if (local->monitor_sdata)
392 return 0;
393
394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395 if (!sdata)
396 return -ENOMEM;
397
398 /* set up data */
399 sdata->local = local;
400 sdata->vif.type = NL80211_IFTYPE_MONITOR;
401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402 wiphy_name(local->hw.wiphy));
403 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
404
405 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
406
407 ieee80211_set_default_queues(sdata);
408
409 ret = drv_add_interface(local, sdata);
410 if (WARN_ON(ret)) {
411 /* ok .. stupid driver, it asked for this! */
412 kfree(sdata);
413 return ret;
414 }
415
416 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
417 if (ret) {
418 kfree(sdata);
419 return ret;
420 }
421
422 mutex_lock(&local->iflist_mtx);
423 rcu_assign_pointer(local->monitor_sdata, sdata);
424 mutex_unlock(&local->iflist_mtx);
425
426 mutex_lock(&local->mtx);
427 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
428 IEEE80211_CHANCTX_EXCLUSIVE);
429 mutex_unlock(&local->mtx);
430 if (ret) {
431 mutex_lock(&local->iflist_mtx);
432 RCU_INIT_POINTER(local->monitor_sdata, NULL);
433 mutex_unlock(&local->iflist_mtx);
434 synchronize_net();
435 drv_remove_interface(local, sdata);
436 kfree(sdata);
437 return ret;
438 }
439
440 return 0;
441 }
442
ieee80211_del_virtual_monitor(struct ieee80211_local * local)443 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
444 {
445 struct ieee80211_sub_if_data *sdata;
446
447 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
448 return;
449
450 ASSERT_RTNL();
451
452 mutex_lock(&local->iflist_mtx);
453
454 sdata = rcu_dereference_protected(local->monitor_sdata,
455 lockdep_is_held(&local->iflist_mtx));
456 if (!sdata) {
457 mutex_unlock(&local->iflist_mtx);
458 return;
459 }
460
461 RCU_INIT_POINTER(local->monitor_sdata, NULL);
462 mutex_unlock(&local->iflist_mtx);
463
464 synchronize_net();
465
466 mutex_lock(&local->mtx);
467 ieee80211_vif_release_channel(sdata);
468 mutex_unlock(&local->mtx);
469
470 drv_remove_interface(local, sdata);
471
472 kfree(sdata);
473 }
474
475 /*
476 * NOTE: Be very careful when changing this function, it must NOT return
477 * an error on interface type changes that have been pre-checked, so most
478 * checks should be in ieee80211_check_concurrent_iface.
479 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)480 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
481 {
482 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
483 struct net_device *dev = wdev->netdev;
484 struct ieee80211_local *local = sdata->local;
485 struct sta_info *sta;
486 u32 changed = 0;
487 int res;
488 u32 hw_reconf_flags = 0;
489
490 switch (sdata->vif.type) {
491 case NL80211_IFTYPE_WDS:
492 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
493 return -ENOLINK;
494 break;
495 case NL80211_IFTYPE_AP_VLAN: {
496 struct ieee80211_sub_if_data *master;
497
498 if (!sdata->bss)
499 return -ENOLINK;
500
501 mutex_lock(&local->mtx);
502 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
503 mutex_unlock(&local->mtx);
504
505 master = container_of(sdata->bss,
506 struct ieee80211_sub_if_data, u.ap);
507 sdata->control_port_protocol =
508 master->control_port_protocol;
509 sdata->control_port_no_encrypt =
510 master->control_port_no_encrypt;
511 sdata->vif.cab_queue = master->vif.cab_queue;
512 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
513 sizeof(sdata->vif.hw_queue));
514 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
515 break;
516 }
517 case NL80211_IFTYPE_AP:
518 sdata->bss = &sdata->u.ap;
519 break;
520 case NL80211_IFTYPE_MESH_POINT:
521 case NL80211_IFTYPE_STATION:
522 case NL80211_IFTYPE_MONITOR:
523 case NL80211_IFTYPE_ADHOC:
524 case NL80211_IFTYPE_P2P_DEVICE:
525 /* no special treatment */
526 break;
527 case NL80211_IFTYPE_UNSPECIFIED:
528 case NUM_NL80211_IFTYPES:
529 case NL80211_IFTYPE_P2P_CLIENT:
530 case NL80211_IFTYPE_P2P_GO:
531 /* cannot happen */
532 WARN_ON(1);
533 break;
534 }
535
536 if (local->open_count == 0) {
537 res = drv_start(local);
538 if (res)
539 goto err_del_bss;
540 /* we're brought up, everything changes */
541 hw_reconf_flags = ~0;
542 ieee80211_led_radio(local, true);
543 ieee80211_mod_tpt_led_trig(local,
544 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
545 }
546
547 /*
548 * Copy the hopefully now-present MAC address to
549 * this interface, if it has the special null one.
550 */
551 if (dev && is_zero_ether_addr(dev->dev_addr)) {
552 memcpy(dev->dev_addr,
553 local->hw.wiphy->perm_addr,
554 ETH_ALEN);
555 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
556
557 if (!is_valid_ether_addr(dev->dev_addr)) {
558 res = -EADDRNOTAVAIL;
559 goto err_stop;
560 }
561 }
562
563 switch (sdata->vif.type) {
564 case NL80211_IFTYPE_AP_VLAN:
565 /* no need to tell driver, but set carrier and chanctx */
566 if (rtnl_dereference(sdata->bss->beacon)) {
567 ieee80211_vif_vlan_copy_chanctx(sdata);
568 netif_carrier_on(dev);
569 } else {
570 netif_carrier_off(dev);
571 }
572 break;
573 case NL80211_IFTYPE_MONITOR:
574 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
575 local->cooked_mntrs++;
576 break;
577 }
578
579 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
580 res = drv_add_interface(local, sdata);
581 if (res)
582 goto err_stop;
583 } else if (local->monitors == 0 && local->open_count == 0) {
584 res = ieee80211_add_virtual_monitor(local);
585 if (res)
586 goto err_stop;
587 }
588
589 /* must be before the call to ieee80211_configure_filter */
590 local->monitors++;
591 if (local->monitors == 1) {
592 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
593 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
594 }
595
596 ieee80211_adjust_monitor_flags(sdata, 1);
597 ieee80211_configure_filter(local);
598 mutex_lock(&local->mtx);
599 ieee80211_recalc_idle(local);
600 mutex_unlock(&local->mtx);
601
602 netif_carrier_on(dev);
603 break;
604 default:
605 if (coming_up) {
606 ieee80211_del_virtual_monitor(local);
607
608 res = drv_add_interface(local, sdata);
609 if (res)
610 goto err_stop;
611 res = ieee80211_check_queues(sdata,
612 ieee80211_vif_type_p2p(&sdata->vif));
613 if (res)
614 goto err_del_interface;
615 }
616
617 if (sdata->vif.type == NL80211_IFTYPE_AP) {
618 local->fif_pspoll++;
619 local->fif_probe_req++;
620
621 ieee80211_configure_filter(local);
622 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
623 local->fif_probe_req++;
624 }
625
626 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
627 changed |= ieee80211_reset_erp_info(sdata);
628 ieee80211_bss_info_change_notify(sdata, changed);
629
630 switch (sdata->vif.type) {
631 case NL80211_IFTYPE_STATION:
632 case NL80211_IFTYPE_ADHOC:
633 case NL80211_IFTYPE_AP:
634 case NL80211_IFTYPE_MESH_POINT:
635 netif_carrier_off(dev);
636 break;
637 case NL80211_IFTYPE_WDS:
638 case NL80211_IFTYPE_P2P_DEVICE:
639 break;
640 default:
641 /* not reached */
642 WARN_ON(1);
643 }
644
645 /*
646 * set default queue parameters so drivers don't
647 * need to initialise the hardware if the hardware
648 * doesn't start up with sane defaults
649 */
650 ieee80211_set_wmm_default(sdata, true);
651 }
652
653 set_bit(SDATA_STATE_RUNNING, &sdata->state);
654
655 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
656 /* Create STA entry for the WDS peer */
657 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
658 GFP_KERNEL);
659 if (!sta) {
660 res = -ENOMEM;
661 goto err_del_interface;
662 }
663
664 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
665 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
666 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
667
668 res = sta_info_insert(sta);
669 if (res) {
670 /* STA has been freed */
671 goto err_del_interface;
672 }
673
674 rate_control_rate_init(sta);
675 netif_carrier_on(dev);
676 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
677 rcu_assign_pointer(local->p2p_sdata, sdata);
678 }
679
680 /*
681 * set_multicast_list will be invoked by the networking core
682 * which will check whether any increments here were done in
683 * error and sync them down to the hardware as filter flags.
684 */
685 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
686 atomic_inc(&local->iff_allmultis);
687
688 if (sdata->flags & IEEE80211_SDATA_PROMISC)
689 atomic_inc(&local->iff_promiscs);
690
691 if (coming_up)
692 local->open_count++;
693
694 if (hw_reconf_flags)
695 ieee80211_hw_config(local, hw_reconf_flags);
696
697 ieee80211_recalc_ps(local, -1);
698
699 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
700 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
701 /* XXX: for AP_VLAN, actually track AP queues */
702 netif_tx_start_all_queues(dev);
703 } else if (dev) {
704 unsigned long flags;
705 int n_acs = IEEE80211_NUM_ACS;
706 int ac;
707
708 if (local->hw.queues < IEEE80211_NUM_ACS)
709 n_acs = 1;
710
711 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
712 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
713 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
714 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
715 for (ac = 0; ac < n_acs; ac++) {
716 int ac_queue = sdata->vif.hw_queue[ac];
717
718 if (local->queue_stop_reasons[ac_queue] == 0 &&
719 skb_queue_empty(&local->pending[ac_queue]))
720 netif_start_subqueue(dev, ac);
721 }
722 }
723 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
724 }
725
726 return 0;
727 err_del_interface:
728 drv_remove_interface(local, sdata);
729 err_stop:
730 if (!local->open_count)
731 drv_stop(local);
732 err_del_bss:
733 sdata->bss = NULL;
734 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
735 mutex_lock(&local->mtx);
736 list_del(&sdata->u.vlan.list);
737 mutex_unlock(&local->mtx);
738 }
739 /* might already be clear but that doesn't matter */
740 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
741 return res;
742 }
743
ieee80211_open(struct net_device * dev)744 static int ieee80211_open(struct net_device *dev)
745 {
746 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
747 int err;
748
749 /* fail early if user set an invalid address */
750 if (!is_valid_ether_addr(dev->dev_addr))
751 return -EADDRNOTAVAIL;
752
753 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
754 if (err)
755 return err;
756
757 return ieee80211_do_open(&sdata->wdev, true);
758 }
759
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)760 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
761 bool going_down)
762 {
763 struct ieee80211_local *local = sdata->local;
764 unsigned long flags;
765 struct sk_buff *skb, *tmp;
766 u32 hw_reconf_flags = 0;
767 int i, flushed;
768 struct ps_data *ps;
769 struct cfg80211_chan_def chandef;
770 bool cancel_scan;
771
772 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
773
774 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
775 if (cancel_scan)
776 ieee80211_scan_cancel(local);
777
778 /*
779 * Stop TX on this interface first.
780 */
781 if (sdata->dev)
782 netif_tx_stop_all_queues(sdata->dev);
783
784 ieee80211_roc_purge(local, sdata);
785
786 switch (sdata->vif.type) {
787 case NL80211_IFTYPE_STATION:
788 ieee80211_mgd_stop(sdata);
789 break;
790 case NL80211_IFTYPE_ADHOC:
791 ieee80211_ibss_stop(sdata);
792 break;
793 case NL80211_IFTYPE_AP:
794 cancel_work_sync(&sdata->u.ap.request_smps_work);
795 break;
796 default:
797 break;
798 }
799
800 /*
801 * Remove all stations associated with this interface.
802 *
803 * This must be done before calling ops->remove_interface()
804 * because otherwise we can later invoke ops->sta_notify()
805 * whenever the STAs are removed, and that invalidates driver
806 * assumptions about always getting a vif pointer that is valid
807 * (because if we remove a STA after ops->remove_interface()
808 * the driver will have removed the vif info already!)
809 *
810 * This is relevant only in WDS mode, in all other modes we've
811 * already removed all stations when disconnecting or similar,
812 * so warn otherwise.
813 */
814 flushed = sta_info_flush(sdata);
815 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
816 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
817
818 /* don't count this interface for promisc/allmulti while it is down */
819 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
820 atomic_dec(&local->iff_allmultis);
821
822 if (sdata->flags & IEEE80211_SDATA_PROMISC)
823 atomic_dec(&local->iff_promiscs);
824
825 if (sdata->vif.type == NL80211_IFTYPE_AP) {
826 local->fif_pspoll--;
827 local->fif_probe_req--;
828 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
829 local->fif_probe_req--;
830 }
831
832 if (sdata->dev) {
833 netif_addr_lock_bh(sdata->dev);
834 spin_lock_bh(&local->filter_lock);
835 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
836 sdata->dev->addr_len);
837 spin_unlock_bh(&local->filter_lock);
838 netif_addr_unlock_bh(sdata->dev);
839 }
840
841 del_timer_sync(&local->dynamic_ps_timer);
842 cancel_work_sync(&local->dynamic_ps_enable_work);
843
844 cancel_work_sync(&sdata->recalc_smps);
845 sdata_lock(sdata);
846 mutex_lock(&local->mtx);
847 sdata->vif.csa_active = false;
848 if (sdata->csa_block_tx) {
849 ieee80211_wake_vif_queues(local, sdata,
850 IEEE80211_QUEUE_STOP_REASON_CSA);
851 sdata->csa_block_tx = false;
852 }
853 mutex_unlock(&local->mtx);
854 sdata_unlock(sdata);
855
856 cancel_work_sync(&sdata->csa_finalize_work);
857
858 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
859
860 if (sdata->wdev.cac_started) {
861 chandef = sdata->vif.bss_conf.chandef;
862 WARN_ON(local->suspended);
863 mutex_lock(&local->mtx);
864 ieee80211_vif_release_channel(sdata);
865 mutex_unlock(&local->mtx);
866 cfg80211_cac_event(sdata->dev, &chandef,
867 NL80211_RADAR_CAC_ABORTED,
868 GFP_KERNEL);
869 }
870
871 /* APs need special treatment */
872 if (sdata->vif.type == NL80211_IFTYPE_AP) {
873 struct ieee80211_sub_if_data *vlan, *tmpsdata;
874
875 /* down all dependent devices, that is VLANs */
876 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
877 u.vlan.list)
878 dev_close(vlan->dev);
879 WARN_ON(!list_empty(&sdata->u.ap.vlans));
880 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
881 /* remove all packets in parent bc_buf pointing to this dev */
882 ps = &sdata->bss->ps;
883
884 spin_lock_irqsave(&ps->bc_buf.lock, flags);
885 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
886 if (skb->dev == sdata->dev) {
887 __skb_unlink(skb, &ps->bc_buf);
888 local->total_ps_buffered--;
889 ieee80211_free_txskb(&local->hw, skb);
890 }
891 }
892 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
893 }
894
895 if (going_down)
896 local->open_count--;
897
898 switch (sdata->vif.type) {
899 case NL80211_IFTYPE_AP_VLAN:
900 mutex_lock(&local->mtx);
901 list_del(&sdata->u.vlan.list);
902 mutex_unlock(&local->mtx);
903 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
904 /* see comment in the default case below */
905 ieee80211_free_keys(sdata, true);
906 /* no need to tell driver */
907 break;
908 case NL80211_IFTYPE_MONITOR:
909 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
910 local->cooked_mntrs--;
911 break;
912 }
913
914 local->monitors--;
915 if (local->monitors == 0) {
916 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
917 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
918 }
919
920 ieee80211_adjust_monitor_flags(sdata, -1);
921 break;
922 case NL80211_IFTYPE_P2P_DEVICE:
923 /* relies on synchronize_rcu() below */
924 RCU_INIT_POINTER(local->p2p_sdata, NULL);
925 /* fall through */
926 default:
927 cancel_work_sync(&sdata->work);
928 /*
929 * When we get here, the interface is marked down.
930 * Free the remaining keys, if there are any
931 * (which can happen in AP mode if userspace sets
932 * keys before the interface is operating, and maybe
933 * also in WDS mode)
934 *
935 * Force the key freeing to always synchronize_net()
936 * to wait for the RX path in case it is using this
937 * interface enqueuing frames at this very time on
938 * another CPU.
939 */
940 ieee80211_free_keys(sdata, true);
941 skb_queue_purge(&sdata->skb_queue);
942 }
943
944 sdata->bss = NULL;
945
946 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
947 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
948 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
949 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
950 if (info->control.vif == &sdata->vif) {
951 __skb_unlink(skb, &local->pending[i]);
952 ieee80211_free_txskb(&local->hw, skb);
953 }
954 }
955 }
956 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
957
958 if (local->open_count == 0)
959 ieee80211_clear_tx_pending(local);
960
961 /*
962 * If the interface goes down while suspended, presumably because
963 * the device was unplugged and that happens before our resume,
964 * then the driver is already unconfigured and the remainder of
965 * this function isn't needed.
966 * XXX: what about WoWLAN? If the device has software state, e.g.
967 * memory allocated, it might expect teardown commands from
968 * mac80211 here?
969 */
970 if (local->suspended) {
971 WARN_ON(local->wowlan);
972 WARN_ON(rtnl_dereference(local->monitor_sdata));
973 return;
974 }
975
976 switch (sdata->vif.type) {
977 case NL80211_IFTYPE_AP_VLAN:
978 break;
979 case NL80211_IFTYPE_MONITOR:
980 if (local->monitors == 0)
981 ieee80211_del_virtual_monitor(local);
982
983 mutex_lock(&local->mtx);
984 ieee80211_recalc_idle(local);
985 mutex_unlock(&local->mtx);
986
987 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
988 break;
989
990 /* fall through */
991 default:
992 if (going_down)
993 drv_remove_interface(local, sdata);
994 }
995
996 ieee80211_recalc_ps(local, -1);
997
998 if (cancel_scan)
999 flush_delayed_work(&local->scan_work);
1000
1001 if (local->open_count == 0) {
1002 ieee80211_stop_device(local);
1003
1004 /* no reconfiguring after stop! */
1005 return;
1006 }
1007
1008 /* do after stop to avoid reconfiguring when we stop anyway */
1009 ieee80211_configure_filter(local);
1010 ieee80211_hw_config(local, hw_reconf_flags);
1011
1012 if (local->monitors == local->open_count)
1013 ieee80211_add_virtual_monitor(local);
1014 }
1015
ieee80211_stop(struct net_device * dev)1016 static int ieee80211_stop(struct net_device *dev)
1017 {
1018 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1019
1020 ieee80211_do_stop(sdata, true);
1021
1022 return 0;
1023 }
1024
ieee80211_set_multicast_list(struct net_device * dev)1025 static void ieee80211_set_multicast_list(struct net_device *dev)
1026 {
1027 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1028 struct ieee80211_local *local = sdata->local;
1029 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1030
1031 allmulti = !!(dev->flags & IFF_ALLMULTI);
1032 promisc = !!(dev->flags & IFF_PROMISC);
1033 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1034 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1035
1036 if (allmulti != sdata_allmulti) {
1037 if (dev->flags & IFF_ALLMULTI)
1038 atomic_inc(&local->iff_allmultis);
1039 else
1040 atomic_dec(&local->iff_allmultis);
1041 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1042 }
1043
1044 if (promisc != sdata_promisc) {
1045 if (dev->flags & IFF_PROMISC)
1046 atomic_inc(&local->iff_promiscs);
1047 else
1048 atomic_dec(&local->iff_promiscs);
1049 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1050 }
1051 spin_lock_bh(&local->filter_lock);
1052 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1053 spin_unlock_bh(&local->filter_lock);
1054 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1055 }
1056
1057 /*
1058 * Called when the netdev is removed or, by the code below, before
1059 * the interface type changes.
1060 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)1061 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1062 {
1063 int i;
1064
1065 /* free extra data */
1066 ieee80211_free_keys(sdata, false);
1067
1068 ieee80211_debugfs_remove_netdev(sdata);
1069
1070 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1071 __skb_queue_purge(&sdata->fragments[i].skb_list);
1072 sdata->fragment_next = 0;
1073
1074 if (ieee80211_vif_is_mesh(&sdata->vif))
1075 mesh_rmc_free(sdata);
1076 }
1077
ieee80211_uninit(struct net_device * dev)1078 static void ieee80211_uninit(struct net_device *dev)
1079 {
1080 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1081 }
1082
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,void * accel_priv,select_queue_fallback_t fallback)1083 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1084 struct sk_buff *skb,
1085 void *accel_priv,
1086 select_queue_fallback_t fallback)
1087 {
1088 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1089 }
1090
1091 static const struct net_device_ops ieee80211_dataif_ops = {
1092 .ndo_open = ieee80211_open,
1093 .ndo_stop = ieee80211_stop,
1094 .ndo_uninit = ieee80211_uninit,
1095 .ndo_start_xmit = ieee80211_subif_start_xmit,
1096 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1097 .ndo_change_mtu = ieee80211_change_mtu,
1098 .ndo_set_mac_address = ieee80211_change_mac,
1099 .ndo_select_queue = ieee80211_netdev_select_queue,
1100 };
1101
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,void * accel_priv,select_queue_fallback_t fallback)1102 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1103 struct sk_buff *skb,
1104 void *accel_priv,
1105 select_queue_fallback_t fallback)
1106 {
1107 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1108 struct ieee80211_local *local = sdata->local;
1109 struct ieee80211_hdr *hdr;
1110 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1111
1112 if (local->hw.queues < IEEE80211_NUM_ACS)
1113 return 0;
1114
1115 if (skb->len < 4 ||
1116 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1117 return 0; /* doesn't matter, frame will be dropped */
1118
1119 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1120
1121 return ieee80211_select_queue_80211(sdata, skb, hdr);
1122 }
1123
1124 static const struct net_device_ops ieee80211_monitorif_ops = {
1125 .ndo_open = ieee80211_open,
1126 .ndo_stop = ieee80211_stop,
1127 .ndo_uninit = ieee80211_uninit,
1128 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1129 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1130 .ndo_change_mtu = ieee80211_change_mtu,
1131 .ndo_set_mac_address = ieee80211_change_mac,
1132 .ndo_select_queue = ieee80211_monitor_select_queue,
1133 };
1134
ieee80211_if_setup(struct net_device * dev)1135 static void ieee80211_if_setup(struct net_device *dev)
1136 {
1137 ether_setup(dev);
1138 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1139 dev->netdev_ops = &ieee80211_dataif_ops;
1140 dev->destructor = free_netdev;
1141 }
1142
ieee80211_iface_work(struct work_struct * work)1143 static void ieee80211_iface_work(struct work_struct *work)
1144 {
1145 struct ieee80211_sub_if_data *sdata =
1146 container_of(work, struct ieee80211_sub_if_data, work);
1147 struct ieee80211_local *local = sdata->local;
1148 struct sk_buff *skb;
1149 struct sta_info *sta;
1150 struct ieee80211_ra_tid *ra_tid;
1151 struct ieee80211_rx_agg *rx_agg;
1152
1153 if (!ieee80211_sdata_running(sdata))
1154 return;
1155
1156 if (local->scanning)
1157 return;
1158
1159 /*
1160 * ieee80211_queue_work() should have picked up most cases,
1161 * here we'll pick the rest.
1162 */
1163 if (WARN(local->suspended,
1164 "interface work scheduled while going to suspend\n"))
1165 return;
1166
1167 /* first process frames */
1168 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1169 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1170
1171 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1172 ra_tid = (void *)&skb->cb;
1173 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1174 ra_tid->tid);
1175 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1176 ra_tid = (void *)&skb->cb;
1177 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1178 ra_tid->tid);
1179 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1180 rx_agg = (void *)&skb->cb;
1181 mutex_lock(&local->sta_mtx);
1182 sta = sta_info_get_bss(sdata, rx_agg->addr);
1183 if (sta)
1184 __ieee80211_start_rx_ba_session(sta,
1185 0, 0, 0, 1, rx_agg->tid,
1186 IEEE80211_MAX_AMPDU_BUF,
1187 false, true);
1188 mutex_unlock(&local->sta_mtx);
1189 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1190 rx_agg = (void *)&skb->cb;
1191 mutex_lock(&local->sta_mtx);
1192 sta = sta_info_get_bss(sdata, rx_agg->addr);
1193 if (sta)
1194 __ieee80211_stop_rx_ba_session(sta,
1195 rx_agg->tid,
1196 WLAN_BACK_RECIPIENT, 0,
1197 false);
1198 mutex_unlock(&local->sta_mtx);
1199 } else if (ieee80211_is_action(mgmt->frame_control) &&
1200 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1201 int len = skb->len;
1202
1203 mutex_lock(&local->sta_mtx);
1204 sta = sta_info_get_bss(sdata, mgmt->sa);
1205 if (sta) {
1206 switch (mgmt->u.action.u.addba_req.action_code) {
1207 case WLAN_ACTION_ADDBA_REQ:
1208 ieee80211_process_addba_request(
1209 local, sta, mgmt, len);
1210 break;
1211 case WLAN_ACTION_ADDBA_RESP:
1212 ieee80211_process_addba_resp(local, sta,
1213 mgmt, len);
1214 break;
1215 case WLAN_ACTION_DELBA:
1216 ieee80211_process_delba(sdata, sta,
1217 mgmt, len);
1218 break;
1219 default:
1220 WARN_ON(1);
1221 break;
1222 }
1223 }
1224 mutex_unlock(&local->sta_mtx);
1225 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1226 struct ieee80211_hdr *hdr = (void *)mgmt;
1227 /*
1228 * So the frame isn't mgmt, but frame_control
1229 * is at the right place anyway, of course, so
1230 * the if statement is correct.
1231 *
1232 * Warn if we have other data frame types here,
1233 * they must not get here.
1234 */
1235 WARN_ON(hdr->frame_control &
1236 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1237 WARN_ON(!(hdr->seq_ctrl &
1238 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1239 /*
1240 * This was a fragment of a frame, received while
1241 * a block-ack session was active. That cannot be
1242 * right, so terminate the session.
1243 */
1244 mutex_lock(&local->sta_mtx);
1245 sta = sta_info_get_bss(sdata, mgmt->sa);
1246 if (sta) {
1247 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1248 IEEE80211_QOS_CTL_TID_MASK;
1249
1250 __ieee80211_stop_rx_ba_session(
1251 sta, tid, WLAN_BACK_RECIPIENT,
1252 WLAN_REASON_QSTA_REQUIRE_SETUP,
1253 true);
1254 }
1255 mutex_unlock(&local->sta_mtx);
1256 } else switch (sdata->vif.type) {
1257 case NL80211_IFTYPE_STATION:
1258 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1259 break;
1260 case NL80211_IFTYPE_ADHOC:
1261 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1262 break;
1263 case NL80211_IFTYPE_MESH_POINT:
1264 if (!ieee80211_vif_is_mesh(&sdata->vif))
1265 break;
1266 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1267 break;
1268 default:
1269 WARN(1, "frame for unexpected interface type");
1270 break;
1271 }
1272
1273 kfree_skb(skb);
1274 }
1275
1276 /* then other type-dependent work */
1277 switch (sdata->vif.type) {
1278 case NL80211_IFTYPE_STATION:
1279 ieee80211_sta_work(sdata);
1280 break;
1281 case NL80211_IFTYPE_ADHOC:
1282 ieee80211_ibss_work(sdata);
1283 break;
1284 case NL80211_IFTYPE_MESH_POINT:
1285 if (!ieee80211_vif_is_mesh(&sdata->vif))
1286 break;
1287 ieee80211_mesh_work(sdata);
1288 break;
1289 default:
1290 break;
1291 }
1292 }
1293
ieee80211_recalc_smps_work(struct work_struct * work)1294 static void ieee80211_recalc_smps_work(struct work_struct *work)
1295 {
1296 struct ieee80211_sub_if_data *sdata =
1297 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1298
1299 ieee80211_recalc_smps(sdata);
1300 }
1301
1302 /*
1303 * Helper function to initialise an interface to a specific type.
1304 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1305 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1306 enum nl80211_iftype type)
1307 {
1308 /* clear type-dependent union */
1309 memset(&sdata->u, 0, sizeof(sdata->u));
1310
1311 /* and set some type-dependent values */
1312 sdata->vif.type = type;
1313 sdata->vif.p2p = false;
1314 sdata->wdev.iftype = type;
1315
1316 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1317 sdata->control_port_no_encrypt = false;
1318 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1319 sdata->vif.bss_conf.idle = true;
1320
1321 sdata->noack_map = 0;
1322
1323 /* only monitor/p2p-device differ */
1324 if (sdata->dev) {
1325 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1326 sdata->dev->type = ARPHRD_ETHER;
1327 }
1328
1329 skb_queue_head_init(&sdata->skb_queue);
1330 INIT_WORK(&sdata->work, ieee80211_iface_work);
1331 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1332 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1333 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1334 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1335
1336 switch (type) {
1337 case NL80211_IFTYPE_P2P_GO:
1338 type = NL80211_IFTYPE_AP;
1339 sdata->vif.type = type;
1340 sdata->vif.p2p = true;
1341 /* fall through */
1342 case NL80211_IFTYPE_AP:
1343 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1344 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1345 INIT_WORK(&sdata->u.ap.request_smps_work,
1346 ieee80211_request_smps_ap_work);
1347 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1348 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1349 break;
1350 case NL80211_IFTYPE_P2P_CLIENT:
1351 type = NL80211_IFTYPE_STATION;
1352 sdata->vif.type = type;
1353 sdata->vif.p2p = true;
1354 /* fall through */
1355 case NL80211_IFTYPE_STATION:
1356 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1357 ieee80211_sta_setup_sdata(sdata);
1358 break;
1359 case NL80211_IFTYPE_ADHOC:
1360 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1361 ieee80211_ibss_setup_sdata(sdata);
1362 break;
1363 case NL80211_IFTYPE_MESH_POINT:
1364 if (ieee80211_vif_is_mesh(&sdata->vif))
1365 ieee80211_mesh_init_sdata(sdata);
1366 break;
1367 case NL80211_IFTYPE_MONITOR:
1368 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1369 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1370 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1371 MONITOR_FLAG_OTHER_BSS;
1372 break;
1373 case NL80211_IFTYPE_WDS:
1374 sdata->vif.bss_conf.bssid = NULL;
1375 break;
1376 case NL80211_IFTYPE_AP_VLAN:
1377 case NL80211_IFTYPE_P2P_DEVICE:
1378 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1379 break;
1380 case NL80211_IFTYPE_UNSPECIFIED:
1381 case NUM_NL80211_IFTYPES:
1382 BUG();
1383 break;
1384 }
1385
1386 ieee80211_debugfs_add_netdev(sdata);
1387 }
1388
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1389 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1390 enum nl80211_iftype type)
1391 {
1392 struct ieee80211_local *local = sdata->local;
1393 int ret, err;
1394 enum nl80211_iftype internal_type = type;
1395 bool p2p = false;
1396
1397 ASSERT_RTNL();
1398
1399 if (!local->ops->change_interface)
1400 return -EBUSY;
1401
1402 switch (sdata->vif.type) {
1403 case NL80211_IFTYPE_AP:
1404 case NL80211_IFTYPE_STATION:
1405 case NL80211_IFTYPE_ADHOC:
1406 /*
1407 * Could maybe also all others here?
1408 * Just not sure how that interacts
1409 * with the RX/config path e.g. for
1410 * mesh.
1411 */
1412 break;
1413 default:
1414 return -EBUSY;
1415 }
1416
1417 switch (type) {
1418 case NL80211_IFTYPE_AP:
1419 case NL80211_IFTYPE_STATION:
1420 case NL80211_IFTYPE_ADHOC:
1421 /*
1422 * Could probably support everything
1423 * but WDS here (WDS do_open can fail
1424 * under memory pressure, which this
1425 * code isn't prepared to handle).
1426 */
1427 break;
1428 case NL80211_IFTYPE_P2P_CLIENT:
1429 p2p = true;
1430 internal_type = NL80211_IFTYPE_STATION;
1431 break;
1432 case NL80211_IFTYPE_P2P_GO:
1433 p2p = true;
1434 internal_type = NL80211_IFTYPE_AP;
1435 break;
1436 default:
1437 return -EBUSY;
1438 }
1439
1440 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1441 if (ret)
1442 return ret;
1443
1444 ieee80211_do_stop(sdata, false);
1445
1446 ieee80211_teardown_sdata(sdata);
1447
1448 ret = drv_change_interface(local, sdata, internal_type, p2p);
1449 if (ret)
1450 type = ieee80211_vif_type_p2p(&sdata->vif);
1451
1452 /*
1453 * Ignore return value here, there's not much we can do since
1454 * the driver changed the interface type internally already.
1455 * The warnings will hopefully make driver authors fix it :-)
1456 */
1457 ieee80211_check_queues(sdata, type);
1458
1459 ieee80211_setup_sdata(sdata, type);
1460
1461 err = ieee80211_do_open(&sdata->wdev, false);
1462 WARN(err, "type change: do_open returned %d", err);
1463
1464 return ret;
1465 }
1466
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1467 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1468 enum nl80211_iftype type)
1469 {
1470 int ret;
1471
1472 ASSERT_RTNL();
1473
1474 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1475 return 0;
1476
1477 if (ieee80211_sdata_running(sdata)) {
1478 ret = ieee80211_runtime_change_iftype(sdata, type);
1479 if (ret)
1480 return ret;
1481 } else {
1482 /* Purge and reset type-dependent state. */
1483 ieee80211_teardown_sdata(sdata);
1484 ieee80211_setup_sdata(sdata, type);
1485 }
1486
1487 /* reset some values that shouldn't be kept across type changes */
1488 sdata->drop_unencrypted = 0;
1489 if (type == NL80211_IFTYPE_STATION)
1490 sdata->u.mgd.use_4addr = false;
1491
1492 return 0;
1493 }
1494
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1495 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1496 u8 *perm_addr, enum nl80211_iftype type)
1497 {
1498 struct ieee80211_sub_if_data *sdata;
1499 u64 mask, start, addr, val, inc;
1500 u8 *m;
1501 u8 tmp_addr[ETH_ALEN];
1502 int i;
1503
1504 /* default ... something at least */
1505 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1506
1507 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1508 local->hw.wiphy->n_addresses <= 1)
1509 return;
1510
1511 mutex_lock(&local->iflist_mtx);
1512
1513 switch (type) {
1514 case NL80211_IFTYPE_MONITOR:
1515 /* doesn't matter */
1516 break;
1517 case NL80211_IFTYPE_WDS:
1518 case NL80211_IFTYPE_AP_VLAN:
1519 /* match up with an AP interface */
1520 list_for_each_entry(sdata, &local->interfaces, list) {
1521 if (sdata->vif.type != NL80211_IFTYPE_AP)
1522 continue;
1523 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1524 break;
1525 }
1526 /* keep default if no AP interface present */
1527 break;
1528 case NL80211_IFTYPE_P2P_CLIENT:
1529 case NL80211_IFTYPE_P2P_GO:
1530 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1531 list_for_each_entry(sdata, &local->interfaces, list) {
1532 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1533 continue;
1534 if (!ieee80211_sdata_running(sdata))
1535 continue;
1536 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1537 goto out_unlock;
1538 }
1539 }
1540 /* otherwise fall through */
1541 default:
1542 /* assign a new address if possible -- try n_addresses first */
1543 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1544 bool used = false;
1545
1546 list_for_each_entry(sdata, &local->interfaces, list) {
1547 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1548 sdata->vif.addr)) {
1549 used = true;
1550 break;
1551 }
1552 }
1553
1554 if (!used) {
1555 memcpy(perm_addr,
1556 local->hw.wiphy->addresses[i].addr,
1557 ETH_ALEN);
1558 break;
1559 }
1560 }
1561
1562 /* try mask if available */
1563 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1564 break;
1565
1566 m = local->hw.wiphy->addr_mask;
1567 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1568 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1569 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1570
1571 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1572 /* not a contiguous mask ... not handled now! */
1573 pr_info("not contiguous\n");
1574 break;
1575 }
1576
1577 /*
1578 * Pick address of existing interface in case user changed
1579 * MAC address manually, default to perm_addr.
1580 */
1581 m = local->hw.wiphy->perm_addr;
1582 list_for_each_entry(sdata, &local->interfaces, list) {
1583 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1584 continue;
1585 m = sdata->vif.addr;
1586 break;
1587 }
1588 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1589 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1590 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1591
1592 inc = 1ULL<<__ffs64(mask);
1593 val = (start & mask);
1594 addr = (start & ~mask) | (val & mask);
1595 do {
1596 bool used = false;
1597
1598 tmp_addr[5] = addr >> 0*8;
1599 tmp_addr[4] = addr >> 1*8;
1600 tmp_addr[3] = addr >> 2*8;
1601 tmp_addr[2] = addr >> 3*8;
1602 tmp_addr[1] = addr >> 4*8;
1603 tmp_addr[0] = addr >> 5*8;
1604
1605 val += inc;
1606
1607 list_for_each_entry(sdata, &local->interfaces, list) {
1608 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1609 used = true;
1610 break;
1611 }
1612 }
1613
1614 if (!used) {
1615 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1616 break;
1617 }
1618 addr = (start & ~mask) | (val & mask);
1619 } while (addr != start);
1620
1621 break;
1622 }
1623
1624 out_unlock:
1625 mutex_unlock(&local->iflist_mtx);
1626 }
1627
ieee80211_if_add(struct ieee80211_local * local,const char * name,struct wireless_dev ** new_wdev,enum nl80211_iftype type,struct vif_params * params)1628 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1629 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1630 struct vif_params *params)
1631 {
1632 struct net_device *ndev = NULL;
1633 struct ieee80211_sub_if_data *sdata = NULL;
1634 int ret, i;
1635 int txqs = 1;
1636
1637 ASSERT_RTNL();
1638
1639 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1640 struct wireless_dev *wdev;
1641
1642 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1643 GFP_KERNEL);
1644 if (!sdata)
1645 return -ENOMEM;
1646 wdev = &sdata->wdev;
1647
1648 sdata->dev = NULL;
1649 strlcpy(sdata->name, name, IFNAMSIZ);
1650 ieee80211_assign_perm_addr(local, wdev->address, type);
1651 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1652 } else {
1653 if (local->hw.queues >= IEEE80211_NUM_ACS)
1654 txqs = IEEE80211_NUM_ACS;
1655
1656 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1657 name, NET_NAME_UNKNOWN,
1658 ieee80211_if_setup, txqs, 1);
1659 if (!ndev)
1660 return -ENOMEM;
1661 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1662
1663 ndev->needed_headroom = local->tx_headroom +
1664 4*6 /* four MAC addresses */
1665 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1666 + 6 /* mesh */
1667 + 8 /* rfc1042/bridge tunnel */
1668 - ETH_HLEN /* ethernet hard_header_len */
1669 + IEEE80211_ENCRYPT_HEADROOM;
1670 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1671
1672 ret = dev_alloc_name(ndev, ndev->name);
1673 if (ret < 0) {
1674 free_netdev(ndev);
1675 return ret;
1676 }
1677
1678 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1679 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1680 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1681
1682 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1683 sdata = netdev_priv(ndev);
1684 ndev->ieee80211_ptr = &sdata->wdev;
1685 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1686 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1687
1688 sdata->dev = ndev;
1689 }
1690
1691 /* initialise type-independent data */
1692 sdata->wdev.wiphy = local->hw.wiphy;
1693 sdata->local = local;
1694
1695 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1696 skb_queue_head_init(&sdata->fragments[i].skb_list);
1697
1698 INIT_LIST_HEAD(&sdata->key_list);
1699
1700 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1701 ieee80211_dfs_cac_timer_work);
1702 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1703 ieee80211_delayed_tailroom_dec);
1704
1705 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1706 struct ieee80211_supported_band *sband;
1707 sband = local->hw.wiphy->bands[i];
1708 sdata->rc_rateidx_mask[i] =
1709 sband ? (1 << sband->n_bitrates) - 1 : 0;
1710 if (sband)
1711 memcpy(sdata->rc_rateidx_mcs_mask[i],
1712 sband->ht_cap.mcs.rx_mask,
1713 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1714 else
1715 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1716 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1717 }
1718
1719 ieee80211_set_default_queues(sdata);
1720
1721 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1722 sdata->user_power_level = local->user_power_level;
1723
1724 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1725
1726 /* setup type-dependent data */
1727 ieee80211_setup_sdata(sdata, type);
1728
1729 if (ndev) {
1730 if (params) {
1731 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1732 if (type == NL80211_IFTYPE_STATION)
1733 sdata->u.mgd.use_4addr = params->use_4addr;
1734 }
1735
1736 ndev->features |= local->hw.netdev_features;
1737
1738 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1739
1740 ret = register_netdevice(ndev);
1741 if (ret) {
1742 free_netdev(ndev);
1743 return ret;
1744 }
1745 }
1746
1747 mutex_lock(&local->iflist_mtx);
1748 list_add_tail_rcu(&sdata->list, &local->interfaces);
1749 mutex_unlock(&local->iflist_mtx);
1750
1751 if (new_wdev)
1752 *new_wdev = &sdata->wdev;
1753
1754 return 0;
1755 }
1756
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)1757 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1758 {
1759 ASSERT_RTNL();
1760
1761 mutex_lock(&sdata->local->iflist_mtx);
1762 list_del_rcu(&sdata->list);
1763 mutex_unlock(&sdata->local->iflist_mtx);
1764
1765 synchronize_rcu();
1766
1767 if (sdata->dev) {
1768 unregister_netdevice(sdata->dev);
1769 } else {
1770 cfg80211_unregister_wdev(&sdata->wdev);
1771 kfree(sdata);
1772 }
1773 }
1774
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)1775 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1776 {
1777 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1778 return;
1779 ieee80211_do_stop(sdata, true);
1780 ieee80211_teardown_sdata(sdata);
1781 }
1782
1783 /*
1784 * Remove all interfaces, may only be called at hardware unregistration
1785 * time because it doesn't do RCU-safe list removals.
1786 */
ieee80211_remove_interfaces(struct ieee80211_local * local)1787 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1788 {
1789 struct ieee80211_sub_if_data *sdata, *tmp;
1790 LIST_HEAD(unreg_list);
1791 LIST_HEAD(wdev_list);
1792
1793 ASSERT_RTNL();
1794
1795 /*
1796 * Close all AP_VLAN interfaces first, as otherwise they
1797 * might be closed while the AP interface they belong to
1798 * is closed, causing unregister_netdevice_many() to crash.
1799 */
1800 list_for_each_entry(sdata, &local->interfaces, list)
1801 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1802 dev_close(sdata->dev);
1803
1804 mutex_lock(&local->iflist_mtx);
1805 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1806 list_del(&sdata->list);
1807
1808 if (sdata->dev)
1809 unregister_netdevice_queue(sdata->dev, &unreg_list);
1810 else
1811 list_add(&sdata->list, &wdev_list);
1812 }
1813 mutex_unlock(&local->iflist_mtx);
1814 unregister_netdevice_many(&unreg_list);
1815
1816 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1817 list_del(&sdata->list);
1818 cfg80211_unregister_wdev(&sdata->wdev);
1819 kfree(sdata);
1820 }
1821 }
1822
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)1823 static int netdev_notify(struct notifier_block *nb,
1824 unsigned long state, void *ptr)
1825 {
1826 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1827 struct ieee80211_sub_if_data *sdata;
1828
1829 if (state != NETDEV_CHANGENAME)
1830 return NOTIFY_DONE;
1831
1832 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1833 return NOTIFY_DONE;
1834
1835 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1836 return NOTIFY_DONE;
1837
1838 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1839 memcpy(sdata->name, dev->name, IFNAMSIZ);
1840 ieee80211_debugfs_rename_netdev(sdata);
1841
1842 return NOTIFY_OK;
1843 }
1844
1845 static struct notifier_block mac80211_netdev_notifier = {
1846 .notifier_call = netdev_notify,
1847 };
1848
ieee80211_iface_init(void)1849 int ieee80211_iface_init(void)
1850 {
1851 return register_netdevice_notifier(&mac80211_netdev_notifier);
1852 }
1853
ieee80211_iface_exit(void)1854 void ieee80211_iface_exit(void)
1855 {
1856 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1857 }
1858