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Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[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 !ieee80211_hw_check(&sdata->local->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 (ieee80211_hw_check(&local->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 (!ieee80211_hw_check(&local->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 (!ieee80211_hw_check(&local->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 * Enable QoS for anything but station interfaces.
668 */
669 ieee80211_set_wmm_default(sdata, true,
670 sdata->vif.type != NL80211_IFTYPE_STATION);
671 }
672
673 set_bit(SDATA_STATE_RUNNING, &sdata->state);
674
675 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
676 /* Create STA entry for the WDS peer */
677 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
678 GFP_KERNEL);
679 if (!sta) {
680 res = -ENOMEM;
681 goto err_del_interface;
682 }
683
684 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
685 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
686 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
687
688 res = sta_info_insert(sta);
689 if (res) {
690 /* STA has been freed */
691 goto err_del_interface;
692 }
693
694 rate_control_rate_init(sta);
695 netif_carrier_on(dev);
696 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
697 rcu_assign_pointer(local->p2p_sdata, sdata);
698 }
699
700 /*
701 * set_multicast_list will be invoked by the networking core
702 * which will check whether any increments here were done in
703 * error and sync them down to the hardware as filter flags.
704 */
705 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
706 atomic_inc(&local->iff_allmultis);
707
708 if (coming_up)
709 local->open_count++;
710
711 if (hw_reconf_flags)
712 ieee80211_hw_config(local, hw_reconf_flags);
713
714 ieee80211_recalc_ps(local);
715
716 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
717 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
718 /* XXX: for AP_VLAN, actually track AP queues */
719 netif_tx_start_all_queues(dev);
720 } else if (dev) {
721 unsigned long flags;
722 int n_acs = IEEE80211_NUM_ACS;
723 int ac;
724
725 if (local->hw.queues < IEEE80211_NUM_ACS)
726 n_acs = 1;
727
728 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
729 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
730 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
731 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
732 for (ac = 0; ac < n_acs; ac++) {
733 int ac_queue = sdata->vif.hw_queue[ac];
734
735 if (local->queue_stop_reasons[ac_queue] == 0 &&
736 skb_queue_empty(&local->pending[ac_queue]))
737 netif_start_subqueue(dev, ac);
738 }
739 }
740 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
741 }
742
743 return 0;
744 err_del_interface:
745 drv_remove_interface(local, sdata);
746 err_stop:
747 if (!local->open_count)
748 drv_stop(local);
749 err_del_bss:
750 sdata->bss = NULL;
751 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
752 mutex_lock(&local->mtx);
753 list_del(&sdata->u.vlan.list);
754 mutex_unlock(&local->mtx);
755 }
756 /* might already be clear but that doesn't matter */
757 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
758 return res;
759 }
760
761 static int ieee80211_open(struct net_device *dev)
762 {
763 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
764 int err;
765
766 /* fail early if user set an invalid address */
767 if (!is_valid_ether_addr(dev->dev_addr))
768 return -EADDRNOTAVAIL;
769
770 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
771 if (err)
772 return err;
773
774 return ieee80211_do_open(&sdata->wdev, true);
775 }
776
777 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
778 bool going_down)
779 {
780 struct ieee80211_local *local = sdata->local;
781 unsigned long flags;
782 struct sk_buff *skb, *tmp;
783 u32 hw_reconf_flags = 0;
784 int i, flushed;
785 struct ps_data *ps;
786 struct cfg80211_chan_def chandef;
787 bool cancel_scan;
788
789 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
790
791 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
792 if (cancel_scan)
793 ieee80211_scan_cancel(local);
794
795 /*
796 * Stop TX on this interface first.
797 */
798 if (sdata->dev)
799 netif_tx_stop_all_queues(sdata->dev);
800
801 ieee80211_roc_purge(local, sdata);
802
803 switch (sdata->vif.type) {
804 case NL80211_IFTYPE_STATION:
805 ieee80211_mgd_stop(sdata);
806 break;
807 case NL80211_IFTYPE_ADHOC:
808 ieee80211_ibss_stop(sdata);
809 break;
810 case NL80211_IFTYPE_AP:
811 cancel_work_sync(&sdata->u.ap.request_smps_work);
812 break;
813 default:
814 break;
815 }
816
817 /*
818 * Remove all stations associated with this interface.
819 *
820 * This must be done before calling ops->remove_interface()
821 * because otherwise we can later invoke ops->sta_notify()
822 * whenever the STAs are removed, and that invalidates driver
823 * assumptions about always getting a vif pointer that is valid
824 * (because if we remove a STA after ops->remove_interface()
825 * the driver will have removed the vif info already!)
826 *
827 * In WDS mode a station must exist here and be flushed, for
828 * AP_VLANs stations may exist since there's nothing else that
829 * would have removed them, but in other modes there shouldn't
830 * be any stations.
831 */
832 flushed = sta_info_flush(sdata);
833 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
834 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
835 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
836
837 /* don't count this interface for allmulti while it is down */
838 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
839 atomic_dec(&local->iff_allmultis);
840
841 if (sdata->vif.type == NL80211_IFTYPE_AP) {
842 local->fif_pspoll--;
843 local->fif_probe_req--;
844 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
845 local->fif_probe_req--;
846 }
847
848 if (sdata->dev) {
849 netif_addr_lock_bh(sdata->dev);
850 spin_lock_bh(&local->filter_lock);
851 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
852 sdata->dev->addr_len);
853 spin_unlock_bh(&local->filter_lock);
854 netif_addr_unlock_bh(sdata->dev);
855 }
856
857 del_timer_sync(&local->dynamic_ps_timer);
858 cancel_work_sync(&local->dynamic_ps_enable_work);
859
860 cancel_work_sync(&sdata->recalc_smps);
861 sdata_lock(sdata);
862 mutex_lock(&local->mtx);
863 sdata->vif.csa_active = false;
864 if (sdata->vif.type == NL80211_IFTYPE_STATION)
865 sdata->u.mgd.csa_waiting_bcn = false;
866 if (sdata->csa_block_tx) {
867 ieee80211_wake_vif_queues(local, sdata,
868 IEEE80211_QUEUE_STOP_REASON_CSA);
869 sdata->csa_block_tx = false;
870 }
871 mutex_unlock(&local->mtx);
872 sdata_unlock(sdata);
873
874 cancel_work_sync(&sdata->csa_finalize_work);
875
876 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
877
878 if (sdata->wdev.cac_started) {
879 chandef = sdata->vif.bss_conf.chandef;
880 WARN_ON(local->suspended);
881 mutex_lock(&local->mtx);
882 ieee80211_vif_release_channel(sdata);
883 mutex_unlock(&local->mtx);
884 cfg80211_cac_event(sdata->dev, &chandef,
885 NL80211_RADAR_CAC_ABORTED,
886 GFP_KERNEL);
887 }
888
889 /* APs need special treatment */
890 if (sdata->vif.type == NL80211_IFTYPE_AP) {
891 struct ieee80211_sub_if_data *vlan, *tmpsdata;
892
893 /* down all dependent devices, that is VLANs */
894 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
895 u.vlan.list)
896 dev_close(vlan->dev);
897 WARN_ON(!list_empty(&sdata->u.ap.vlans));
898 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
899 /* remove all packets in parent bc_buf pointing to this dev */
900 ps = &sdata->bss->ps;
901
902 spin_lock_irqsave(&ps->bc_buf.lock, flags);
903 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
904 if (skb->dev == sdata->dev) {
905 __skb_unlink(skb, &ps->bc_buf);
906 local->total_ps_buffered--;
907 ieee80211_free_txskb(&local->hw, skb);
908 }
909 }
910 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
911 }
912
913 if (going_down)
914 local->open_count--;
915
916 switch (sdata->vif.type) {
917 case NL80211_IFTYPE_AP_VLAN:
918 mutex_lock(&local->mtx);
919 list_del(&sdata->u.vlan.list);
920 mutex_unlock(&local->mtx);
921 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
922 /* see comment in the default case below */
923 ieee80211_free_keys(sdata, true);
924 /* no need to tell driver */
925 break;
926 case NL80211_IFTYPE_MONITOR:
927 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
928 local->cooked_mntrs--;
929 break;
930 }
931
932 local->monitors--;
933 if (local->monitors == 0) {
934 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
935 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
936 }
937
938 ieee80211_adjust_monitor_flags(sdata, -1);
939 break;
940 case NL80211_IFTYPE_P2P_DEVICE:
941 /* relies on synchronize_rcu() below */
942 RCU_INIT_POINTER(local->p2p_sdata, NULL);
943 /* fall through */
944 default:
945 cancel_work_sync(&sdata->work);
946 /*
947 * When we get here, the interface is marked down.
948 * Free the remaining keys, if there are any
949 * (which can happen in AP mode if userspace sets
950 * keys before the interface is operating, and maybe
951 * also in WDS mode)
952 *
953 * Force the key freeing to always synchronize_net()
954 * to wait for the RX path in case it is using this
955 * interface enqueuing frames at this very time on
956 * another CPU.
957 */
958 ieee80211_free_keys(sdata, true);
959 skb_queue_purge(&sdata->skb_queue);
960 }
961
962 sdata->bss = NULL;
963
964 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
965 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
966 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
967 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
968 if (info->control.vif == &sdata->vif) {
969 __skb_unlink(skb, &local->pending[i]);
970 ieee80211_free_txskb(&local->hw, skb);
971 }
972 }
973 }
974 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
975
976 if (sdata->vif.txq) {
977 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
978
979 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
980 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
981 }
982
983 if (local->open_count == 0)
984 ieee80211_clear_tx_pending(local);
985
986 /*
987 * If the interface goes down while suspended, presumably because
988 * the device was unplugged and that happens before our resume,
989 * then the driver is already unconfigured and the remainder of
990 * this function isn't needed.
991 * XXX: what about WoWLAN? If the device has software state, e.g.
992 * memory allocated, it might expect teardown commands from
993 * mac80211 here?
994 */
995 if (local->suspended) {
996 WARN_ON(local->wowlan);
997 WARN_ON(rtnl_dereference(local->monitor_sdata));
998 return;
999 }
1000
1001 switch (sdata->vif.type) {
1002 case NL80211_IFTYPE_AP_VLAN:
1003 break;
1004 case NL80211_IFTYPE_MONITOR:
1005 if (local->monitors == 0)
1006 ieee80211_del_virtual_monitor(local);
1007
1008 mutex_lock(&local->mtx);
1009 ieee80211_recalc_idle(local);
1010 mutex_unlock(&local->mtx);
1011
1012 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1013 break;
1014
1015 /* fall through */
1016 default:
1017 if (going_down)
1018 drv_remove_interface(local, sdata);
1019 }
1020
1021 ieee80211_recalc_ps(local);
1022
1023 if (cancel_scan)
1024 flush_delayed_work(&local->scan_work);
1025
1026 if (local->open_count == 0) {
1027 ieee80211_stop_device(local);
1028
1029 /* no reconfiguring after stop! */
1030 return;
1031 }
1032
1033 /* do after stop to avoid reconfiguring when we stop anyway */
1034 ieee80211_configure_filter(local);
1035 ieee80211_hw_config(local, hw_reconf_flags);
1036
1037 if (local->monitors == local->open_count)
1038 ieee80211_add_virtual_monitor(local);
1039 }
1040
1041 static int ieee80211_stop(struct net_device *dev)
1042 {
1043 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1044
1045 ieee80211_do_stop(sdata, true);
1046
1047 return 0;
1048 }
1049
1050 static void ieee80211_set_multicast_list(struct net_device *dev)
1051 {
1052 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1053 struct ieee80211_local *local = sdata->local;
1054 int allmulti, sdata_allmulti;
1055
1056 allmulti = !!(dev->flags & IFF_ALLMULTI);
1057 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1058
1059 if (allmulti != sdata_allmulti) {
1060 if (dev->flags & IFF_ALLMULTI)
1061 atomic_inc(&local->iff_allmultis);
1062 else
1063 atomic_dec(&local->iff_allmultis);
1064 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1065 }
1066
1067 spin_lock_bh(&local->filter_lock);
1068 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1069 spin_unlock_bh(&local->filter_lock);
1070 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1071 }
1072
1073 /*
1074 * Called when the netdev is removed or, by the code below, before
1075 * the interface type changes.
1076 */
1077 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1078 {
1079 int i;
1080
1081 /* free extra data */
1082 ieee80211_free_keys(sdata, false);
1083
1084 ieee80211_debugfs_remove_netdev(sdata);
1085
1086 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1087 __skb_queue_purge(&sdata->fragments[i].skb_list);
1088 sdata->fragment_next = 0;
1089
1090 if (ieee80211_vif_is_mesh(&sdata->vif))
1091 mesh_rmc_free(sdata);
1092 }
1093
1094 static void ieee80211_uninit(struct net_device *dev)
1095 {
1096 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1097 }
1098
1099 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1100 struct sk_buff *skb,
1101 void *accel_priv,
1102 select_queue_fallback_t fallback)
1103 {
1104 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1105 }
1106
1107 static struct rtnl_link_stats64 *
1108 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1109 {
1110 int i;
1111
1112 for_each_possible_cpu(i) {
1113 const struct pcpu_sw_netstats *tstats;
1114 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1115 unsigned int start;
1116
1117 tstats = per_cpu_ptr(dev->tstats, i);
1118
1119 do {
1120 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1121 rx_packets = tstats->rx_packets;
1122 tx_packets = tstats->tx_packets;
1123 rx_bytes = tstats->rx_bytes;
1124 tx_bytes = tstats->tx_bytes;
1125 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1126
1127 stats->rx_packets += rx_packets;
1128 stats->tx_packets += tx_packets;
1129 stats->rx_bytes += rx_bytes;
1130 stats->tx_bytes += tx_bytes;
1131 }
1132
1133 return stats;
1134 }
1135
1136 static const struct net_device_ops ieee80211_dataif_ops = {
1137 .ndo_open = ieee80211_open,
1138 .ndo_stop = ieee80211_stop,
1139 .ndo_uninit = ieee80211_uninit,
1140 .ndo_start_xmit = ieee80211_subif_start_xmit,
1141 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1142 .ndo_change_mtu = ieee80211_change_mtu,
1143 .ndo_set_mac_address = ieee80211_change_mac,
1144 .ndo_select_queue = ieee80211_netdev_select_queue,
1145 .ndo_get_stats64 = ieee80211_get_stats64,
1146 };
1147
1148 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1149 struct sk_buff *skb,
1150 void *accel_priv,
1151 select_queue_fallback_t fallback)
1152 {
1153 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1154 struct ieee80211_local *local = sdata->local;
1155 struct ieee80211_hdr *hdr;
1156 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1157
1158 if (local->hw.queues < IEEE80211_NUM_ACS)
1159 return 0;
1160
1161 if (skb->len < 4 ||
1162 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1163 return 0; /* doesn't matter, frame will be dropped */
1164
1165 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1166
1167 return ieee80211_select_queue_80211(sdata, skb, hdr);
1168 }
1169
1170 static const struct net_device_ops ieee80211_monitorif_ops = {
1171 .ndo_open = ieee80211_open,
1172 .ndo_stop = ieee80211_stop,
1173 .ndo_uninit = ieee80211_uninit,
1174 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1175 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1176 .ndo_change_mtu = ieee80211_change_mtu,
1177 .ndo_set_mac_address = ieee80211_change_mac,
1178 .ndo_select_queue = ieee80211_monitor_select_queue,
1179 .ndo_get_stats64 = ieee80211_get_stats64,
1180 };
1181
1182 static void ieee80211_if_free(struct net_device *dev)
1183 {
1184 free_percpu(dev->tstats);
1185 free_netdev(dev);
1186 }
1187
1188 static void ieee80211_if_setup(struct net_device *dev)
1189 {
1190 ether_setup(dev);
1191 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1192 dev->netdev_ops = &ieee80211_dataif_ops;
1193 dev->destructor = ieee80211_if_free;
1194 }
1195
1196 static void ieee80211_iface_work(struct work_struct *work)
1197 {
1198 struct ieee80211_sub_if_data *sdata =
1199 container_of(work, struct ieee80211_sub_if_data, work);
1200 struct ieee80211_local *local = sdata->local;
1201 struct sk_buff *skb;
1202 struct sta_info *sta;
1203 struct ieee80211_ra_tid *ra_tid;
1204 struct ieee80211_rx_agg *rx_agg;
1205
1206 if (!ieee80211_sdata_running(sdata))
1207 return;
1208
1209 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1210 return;
1211
1212 if (!ieee80211_can_run_worker(local))
1213 return;
1214
1215 /* first process frames */
1216 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1217 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1218
1219 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1220 ra_tid = (void *)&skb->cb;
1221 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1222 ra_tid->tid);
1223 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1224 ra_tid = (void *)&skb->cb;
1225 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1226 ra_tid->tid);
1227 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1228 rx_agg = (void *)&skb->cb;
1229 mutex_lock(&local->sta_mtx);
1230 sta = sta_info_get_bss(sdata, rx_agg->addr);
1231 if (sta)
1232 __ieee80211_start_rx_ba_session(sta,
1233 0, 0, 0, 1, rx_agg->tid,
1234 IEEE80211_MAX_AMPDU_BUF,
1235 false, true);
1236 mutex_unlock(&local->sta_mtx);
1237 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1238 rx_agg = (void *)&skb->cb;
1239 mutex_lock(&local->sta_mtx);
1240 sta = sta_info_get_bss(sdata, rx_agg->addr);
1241 if (sta)
1242 __ieee80211_stop_rx_ba_session(sta,
1243 rx_agg->tid,
1244 WLAN_BACK_RECIPIENT, 0,
1245 false);
1246 mutex_unlock(&local->sta_mtx);
1247 } else if (ieee80211_is_action(mgmt->frame_control) &&
1248 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1249 int len = skb->len;
1250
1251 mutex_lock(&local->sta_mtx);
1252 sta = sta_info_get_bss(sdata, mgmt->sa);
1253 if (sta) {
1254 switch (mgmt->u.action.u.addba_req.action_code) {
1255 case WLAN_ACTION_ADDBA_REQ:
1256 ieee80211_process_addba_request(
1257 local, sta, mgmt, len);
1258 break;
1259 case WLAN_ACTION_ADDBA_RESP:
1260 ieee80211_process_addba_resp(local, sta,
1261 mgmt, len);
1262 break;
1263 case WLAN_ACTION_DELBA:
1264 ieee80211_process_delba(sdata, sta,
1265 mgmt, len);
1266 break;
1267 default:
1268 WARN_ON(1);
1269 break;
1270 }
1271 }
1272 mutex_unlock(&local->sta_mtx);
1273 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1274 struct ieee80211_hdr *hdr = (void *)mgmt;
1275 /*
1276 * So the frame isn't mgmt, but frame_control
1277 * is at the right place anyway, of course, so
1278 * the if statement is correct.
1279 *
1280 * Warn if we have other data frame types here,
1281 * they must not get here.
1282 */
1283 WARN_ON(hdr->frame_control &
1284 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1285 WARN_ON(!(hdr->seq_ctrl &
1286 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1287 /*
1288 * This was a fragment of a frame, received while
1289 * a block-ack session was active. That cannot be
1290 * right, so terminate the session.
1291 */
1292 mutex_lock(&local->sta_mtx);
1293 sta = sta_info_get_bss(sdata, mgmt->sa);
1294 if (sta) {
1295 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1296 IEEE80211_QOS_CTL_TID_MASK;
1297
1298 __ieee80211_stop_rx_ba_session(
1299 sta, tid, WLAN_BACK_RECIPIENT,
1300 WLAN_REASON_QSTA_REQUIRE_SETUP,
1301 true);
1302 }
1303 mutex_unlock(&local->sta_mtx);
1304 } else switch (sdata->vif.type) {
1305 case NL80211_IFTYPE_STATION:
1306 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1307 break;
1308 case NL80211_IFTYPE_ADHOC:
1309 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1310 break;
1311 case NL80211_IFTYPE_MESH_POINT:
1312 if (!ieee80211_vif_is_mesh(&sdata->vif))
1313 break;
1314 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1315 break;
1316 default:
1317 WARN(1, "frame for unexpected interface type");
1318 break;
1319 }
1320
1321 kfree_skb(skb);
1322 }
1323
1324 /* then other type-dependent work */
1325 switch (sdata->vif.type) {
1326 case NL80211_IFTYPE_STATION:
1327 ieee80211_sta_work(sdata);
1328 break;
1329 case NL80211_IFTYPE_ADHOC:
1330 ieee80211_ibss_work(sdata);
1331 break;
1332 case NL80211_IFTYPE_MESH_POINT:
1333 if (!ieee80211_vif_is_mesh(&sdata->vif))
1334 break;
1335 ieee80211_mesh_work(sdata);
1336 break;
1337 case NL80211_IFTYPE_OCB:
1338 ieee80211_ocb_work(sdata);
1339 break;
1340 default:
1341 break;
1342 }
1343 }
1344
1345 static void ieee80211_recalc_smps_work(struct work_struct *work)
1346 {
1347 struct ieee80211_sub_if_data *sdata =
1348 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1349
1350 ieee80211_recalc_smps(sdata);
1351 }
1352
1353 /*
1354 * Helper function to initialise an interface to a specific type.
1355 */
1356 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1357 enum nl80211_iftype type)
1358 {
1359 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1360 0xff, 0xff, 0xff};
1361
1362 /* clear type-dependent union */
1363 memset(&sdata->u, 0, sizeof(sdata->u));
1364
1365 /* and set some type-dependent values */
1366 sdata->vif.type = type;
1367 sdata->vif.p2p = false;
1368 sdata->wdev.iftype = type;
1369
1370 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1371 sdata->control_port_no_encrypt = false;
1372 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1373 sdata->vif.bss_conf.idle = true;
1374
1375 sdata->noack_map = 0;
1376
1377 /* only monitor/p2p-device differ */
1378 if (sdata->dev) {
1379 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1380 sdata->dev->type = ARPHRD_ETHER;
1381 }
1382
1383 skb_queue_head_init(&sdata->skb_queue);
1384 INIT_WORK(&sdata->work, ieee80211_iface_work);
1385 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1386 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1387 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1388 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1389
1390 switch (type) {
1391 case NL80211_IFTYPE_P2P_GO:
1392 type = NL80211_IFTYPE_AP;
1393 sdata->vif.type = type;
1394 sdata->vif.p2p = true;
1395 /* fall through */
1396 case NL80211_IFTYPE_AP:
1397 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1398 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1399 INIT_WORK(&sdata->u.ap.request_smps_work,
1400 ieee80211_request_smps_ap_work);
1401 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1402 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1403 break;
1404 case NL80211_IFTYPE_P2P_CLIENT:
1405 type = NL80211_IFTYPE_STATION;
1406 sdata->vif.type = type;
1407 sdata->vif.p2p = true;
1408 /* fall through */
1409 case NL80211_IFTYPE_STATION:
1410 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1411 ieee80211_sta_setup_sdata(sdata);
1412 break;
1413 case NL80211_IFTYPE_OCB:
1414 sdata->vif.bss_conf.bssid = bssid_wildcard;
1415 ieee80211_ocb_setup_sdata(sdata);
1416 break;
1417 case NL80211_IFTYPE_ADHOC:
1418 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1419 ieee80211_ibss_setup_sdata(sdata);
1420 break;
1421 case NL80211_IFTYPE_MESH_POINT:
1422 if (ieee80211_vif_is_mesh(&sdata->vif))
1423 ieee80211_mesh_init_sdata(sdata);
1424 break;
1425 case NL80211_IFTYPE_MONITOR:
1426 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1427 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1428 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1429 MONITOR_FLAG_OTHER_BSS;
1430 break;
1431 case NL80211_IFTYPE_WDS:
1432 sdata->vif.bss_conf.bssid = NULL;
1433 break;
1434 case NL80211_IFTYPE_AP_VLAN:
1435 case NL80211_IFTYPE_P2P_DEVICE:
1436 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1437 break;
1438 case NL80211_IFTYPE_UNSPECIFIED:
1439 case NUM_NL80211_IFTYPES:
1440 BUG();
1441 break;
1442 }
1443
1444 ieee80211_debugfs_add_netdev(sdata);
1445 }
1446
1447 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1448 enum nl80211_iftype type)
1449 {
1450 struct ieee80211_local *local = sdata->local;
1451 int ret, err;
1452 enum nl80211_iftype internal_type = type;
1453 bool p2p = false;
1454
1455 ASSERT_RTNL();
1456
1457 if (!local->ops->change_interface)
1458 return -EBUSY;
1459
1460 switch (sdata->vif.type) {
1461 case NL80211_IFTYPE_AP:
1462 case NL80211_IFTYPE_STATION:
1463 case NL80211_IFTYPE_ADHOC:
1464 case NL80211_IFTYPE_OCB:
1465 /*
1466 * Could maybe also all others here?
1467 * Just not sure how that interacts
1468 * with the RX/config path e.g. for
1469 * mesh.
1470 */
1471 break;
1472 default:
1473 return -EBUSY;
1474 }
1475
1476 switch (type) {
1477 case NL80211_IFTYPE_AP:
1478 case NL80211_IFTYPE_STATION:
1479 case NL80211_IFTYPE_ADHOC:
1480 case NL80211_IFTYPE_OCB:
1481 /*
1482 * Could probably support everything
1483 * but WDS here (WDS do_open can fail
1484 * under memory pressure, which this
1485 * code isn't prepared to handle).
1486 */
1487 break;
1488 case NL80211_IFTYPE_P2P_CLIENT:
1489 p2p = true;
1490 internal_type = NL80211_IFTYPE_STATION;
1491 break;
1492 case NL80211_IFTYPE_P2P_GO:
1493 p2p = true;
1494 internal_type = NL80211_IFTYPE_AP;
1495 break;
1496 default:
1497 return -EBUSY;
1498 }
1499
1500 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1501 if (ret)
1502 return ret;
1503
1504 ieee80211_do_stop(sdata, false);
1505
1506 ieee80211_teardown_sdata(sdata);
1507
1508 ret = drv_change_interface(local, sdata, internal_type, p2p);
1509 if (ret)
1510 type = ieee80211_vif_type_p2p(&sdata->vif);
1511
1512 /*
1513 * Ignore return value here, there's not much we can do since
1514 * the driver changed the interface type internally already.
1515 * The warnings will hopefully make driver authors fix it :-)
1516 */
1517 ieee80211_check_queues(sdata, type);
1518
1519 ieee80211_setup_sdata(sdata, type);
1520
1521 err = ieee80211_do_open(&sdata->wdev, false);
1522 WARN(err, "type change: do_open returned %d", err);
1523
1524 return ret;
1525 }
1526
1527 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1528 enum nl80211_iftype type)
1529 {
1530 int ret;
1531
1532 ASSERT_RTNL();
1533
1534 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1535 return 0;
1536
1537 if (ieee80211_sdata_running(sdata)) {
1538 ret = ieee80211_runtime_change_iftype(sdata, type);
1539 if (ret)
1540 return ret;
1541 } else {
1542 /* Purge and reset type-dependent state. */
1543 ieee80211_teardown_sdata(sdata);
1544 ieee80211_setup_sdata(sdata, type);
1545 }
1546
1547 /* reset some values that shouldn't be kept across type changes */
1548 if (type == NL80211_IFTYPE_STATION)
1549 sdata->u.mgd.use_4addr = false;
1550
1551 return 0;
1552 }
1553
1554 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1555 u8 *perm_addr, enum nl80211_iftype type)
1556 {
1557 struct ieee80211_sub_if_data *sdata;
1558 u64 mask, start, addr, val, inc;
1559 u8 *m;
1560 u8 tmp_addr[ETH_ALEN];
1561 int i;
1562
1563 /* default ... something at least */
1564 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1565
1566 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1567 local->hw.wiphy->n_addresses <= 1)
1568 return;
1569
1570 mutex_lock(&local->iflist_mtx);
1571
1572 switch (type) {
1573 case NL80211_IFTYPE_MONITOR:
1574 /* doesn't matter */
1575 break;
1576 case NL80211_IFTYPE_WDS:
1577 case NL80211_IFTYPE_AP_VLAN:
1578 /* match up with an AP interface */
1579 list_for_each_entry(sdata, &local->interfaces, list) {
1580 if (sdata->vif.type != NL80211_IFTYPE_AP)
1581 continue;
1582 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1583 break;
1584 }
1585 /* keep default if no AP interface present */
1586 break;
1587 case NL80211_IFTYPE_P2P_CLIENT:
1588 case NL80211_IFTYPE_P2P_GO:
1589 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1590 list_for_each_entry(sdata, &local->interfaces, list) {
1591 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1592 continue;
1593 if (!ieee80211_sdata_running(sdata))
1594 continue;
1595 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1596 goto out_unlock;
1597 }
1598 }
1599 /* otherwise fall through */
1600 default:
1601 /* assign a new address if possible -- try n_addresses first */
1602 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1603 bool used = false;
1604
1605 list_for_each_entry(sdata, &local->interfaces, list) {
1606 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1607 sdata->vif.addr)) {
1608 used = true;
1609 break;
1610 }
1611 }
1612
1613 if (!used) {
1614 memcpy(perm_addr,
1615 local->hw.wiphy->addresses[i].addr,
1616 ETH_ALEN);
1617 break;
1618 }
1619 }
1620
1621 /* try mask if available */
1622 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1623 break;
1624
1625 m = local->hw.wiphy->addr_mask;
1626 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1627 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1628 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1629
1630 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1631 /* not a contiguous mask ... not handled now! */
1632 pr_info("not contiguous\n");
1633 break;
1634 }
1635
1636 /*
1637 * Pick address of existing interface in case user changed
1638 * MAC address manually, default to perm_addr.
1639 */
1640 m = local->hw.wiphy->perm_addr;
1641 list_for_each_entry(sdata, &local->interfaces, list) {
1642 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1643 continue;
1644 m = sdata->vif.addr;
1645 break;
1646 }
1647 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1648 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1649 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1650
1651 inc = 1ULL<<__ffs64(mask);
1652 val = (start & mask);
1653 addr = (start & ~mask) | (val & mask);
1654 do {
1655 bool used = false;
1656
1657 tmp_addr[5] = addr >> 0*8;
1658 tmp_addr[4] = addr >> 1*8;
1659 tmp_addr[3] = addr >> 2*8;
1660 tmp_addr[2] = addr >> 3*8;
1661 tmp_addr[1] = addr >> 4*8;
1662 tmp_addr[0] = addr >> 5*8;
1663
1664 val += inc;
1665
1666 list_for_each_entry(sdata, &local->interfaces, list) {
1667 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1668 used = true;
1669 break;
1670 }
1671 }
1672
1673 if (!used) {
1674 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1675 break;
1676 }
1677 addr = (start & ~mask) | (val & mask);
1678 } while (addr != start);
1679
1680 break;
1681 }
1682
1683 out_unlock:
1684 mutex_unlock(&local->iflist_mtx);
1685 }
1686
1687 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1688 unsigned char name_assign_type,
1689 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1690 struct vif_params *params)
1691 {
1692 struct net_device *ndev = NULL;
1693 struct ieee80211_sub_if_data *sdata = NULL;
1694 struct txq_info *txqi;
1695 int ret, i;
1696 int txqs = 1;
1697
1698 ASSERT_RTNL();
1699
1700 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1701 struct wireless_dev *wdev;
1702
1703 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1704 GFP_KERNEL);
1705 if (!sdata)
1706 return -ENOMEM;
1707 wdev = &sdata->wdev;
1708
1709 sdata->dev = NULL;
1710 strlcpy(sdata->name, name, IFNAMSIZ);
1711 ieee80211_assign_perm_addr(local, wdev->address, type);
1712 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1713 } else {
1714 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1715 sizeof(void *));
1716 int txq_size = 0;
1717
1718 if (local->ops->wake_tx_queue)
1719 txq_size += sizeof(struct txq_info) +
1720 local->hw.txq_data_size;
1721
1722 if (local->hw.queues >= IEEE80211_NUM_ACS)
1723 txqs = IEEE80211_NUM_ACS;
1724
1725 ndev = alloc_netdev_mqs(size + txq_size,
1726 name, name_assign_type,
1727 ieee80211_if_setup, txqs, 1);
1728 if (!ndev)
1729 return -ENOMEM;
1730 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1731
1732 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1733 if (!ndev->tstats) {
1734 free_netdev(ndev);
1735 return -ENOMEM;
1736 }
1737
1738 ndev->needed_headroom = local->tx_headroom +
1739 4*6 /* four MAC addresses */
1740 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1741 + 6 /* mesh */
1742 + 8 /* rfc1042/bridge tunnel */
1743 - ETH_HLEN /* ethernet hard_header_len */
1744 + IEEE80211_ENCRYPT_HEADROOM;
1745 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1746
1747 ret = dev_alloc_name(ndev, ndev->name);
1748 if (ret < 0) {
1749 free_netdev(ndev);
1750 return ret;
1751 }
1752
1753 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1754 if (params && is_valid_ether_addr(params->macaddr))
1755 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1756 else
1757 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1758 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1759
1760 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1761 sdata = netdev_priv(ndev);
1762 ndev->ieee80211_ptr = &sdata->wdev;
1763 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1764 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1765
1766 if (txq_size) {
1767 txqi = netdev_priv(ndev) + size;
1768 ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1769 }
1770
1771 sdata->dev = ndev;
1772 }
1773
1774 /* initialise type-independent data */
1775 sdata->wdev.wiphy = local->hw.wiphy;
1776 sdata->local = local;
1777
1778 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1779 skb_queue_head_init(&sdata->fragments[i].skb_list);
1780
1781 INIT_LIST_HEAD(&sdata->key_list);
1782
1783 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1784 ieee80211_dfs_cac_timer_work);
1785 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1786 ieee80211_delayed_tailroom_dec);
1787
1788 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1789 struct ieee80211_supported_band *sband;
1790 sband = local->hw.wiphy->bands[i];
1791 sdata->rc_rateidx_mask[i] =
1792 sband ? (1 << sband->n_bitrates) - 1 : 0;
1793 if (sband) {
1794 __le16 cap;
1795 u16 *vht_rate_mask;
1796
1797 memcpy(sdata->rc_rateidx_mcs_mask[i],
1798 sband->ht_cap.mcs.rx_mask,
1799 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1800
1801 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1802 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1803 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1804 } else {
1805 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1806 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1807 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1808 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1809 }
1810 }
1811
1812 ieee80211_set_default_queues(sdata);
1813
1814 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1815 sdata->user_power_level = local->user_power_level;
1816
1817 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1818
1819 /* setup type-dependent data */
1820 ieee80211_setup_sdata(sdata, type);
1821
1822 if (ndev) {
1823 if (params) {
1824 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1825 if (type == NL80211_IFTYPE_STATION)
1826 sdata->u.mgd.use_4addr = params->use_4addr;
1827 }
1828
1829 ndev->features |= local->hw.netdev_features;
1830
1831 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1832
1833 ret = register_netdevice(ndev);
1834 if (ret) {
1835 free_netdev(ndev);
1836 return ret;
1837 }
1838 }
1839
1840 mutex_lock(&local->iflist_mtx);
1841 list_add_tail_rcu(&sdata->list, &local->interfaces);
1842 mutex_unlock(&local->iflist_mtx);
1843
1844 if (new_wdev)
1845 *new_wdev = &sdata->wdev;
1846
1847 return 0;
1848 }
1849
1850 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1851 {
1852 ASSERT_RTNL();
1853
1854 mutex_lock(&sdata->local->iflist_mtx);
1855 list_del_rcu(&sdata->list);
1856 mutex_unlock(&sdata->local->iflist_mtx);
1857
1858 synchronize_rcu();
1859
1860 if (sdata->dev) {
1861 unregister_netdevice(sdata->dev);
1862 } else {
1863 cfg80211_unregister_wdev(&sdata->wdev);
1864 kfree(sdata);
1865 }
1866 }
1867
1868 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1869 {
1870 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1871 return;
1872 ieee80211_do_stop(sdata, true);
1873 ieee80211_teardown_sdata(sdata);
1874 }
1875
1876 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1877 {
1878 struct ieee80211_sub_if_data *sdata, *tmp;
1879 LIST_HEAD(unreg_list);
1880 LIST_HEAD(wdev_list);
1881
1882 ASSERT_RTNL();
1883
1884 /* Before destroying the interfaces, make sure they're all stopped so
1885 * that the hardware is stopped. Otherwise, the driver might still be
1886 * iterating the interfaces during the shutdown, e.g. from a worker
1887 * or from RX processing or similar, and if it does so (using atomic
1888 * iteration) while we're manipulating the list, the iteration will
1889 * crash.
1890 *
1891 * After this, the hardware should be stopped and the driver should
1892 * have stopped all of its activities, so that we can do RCU-unaware
1893 * manipulations of the interface list below.
1894 */
1895 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1896
1897 WARN(local->open_count, "%s: open count remains %d\n",
1898 wiphy_name(local->hw.wiphy), local->open_count);
1899
1900 mutex_lock(&local->iflist_mtx);
1901 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1902 list_del(&sdata->list);
1903
1904 if (sdata->dev)
1905 unregister_netdevice_queue(sdata->dev, &unreg_list);
1906 else
1907 list_add(&sdata->list, &wdev_list);
1908 }
1909 mutex_unlock(&local->iflist_mtx);
1910 unregister_netdevice_many(&unreg_list);
1911
1912 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1913 list_del(&sdata->list);
1914 cfg80211_unregister_wdev(&sdata->wdev);
1915 kfree(sdata);
1916 }
1917 }
1918
1919 static int netdev_notify(struct notifier_block *nb,
1920 unsigned long state, void *ptr)
1921 {
1922 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1923 struct ieee80211_sub_if_data *sdata;
1924
1925 if (state != NETDEV_CHANGENAME)
1926 return NOTIFY_DONE;
1927
1928 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1929 return NOTIFY_DONE;
1930
1931 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1932 return NOTIFY_DONE;
1933
1934 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1935 memcpy(sdata->name, dev->name, IFNAMSIZ);
1936 ieee80211_debugfs_rename_netdev(sdata);
1937
1938 return NOTIFY_OK;
1939 }
1940
1941 static struct notifier_block mac80211_netdev_notifier = {
1942 .notifier_call = netdev_notify,
1943 };
1944
1945 int ieee80211_iface_init(void)
1946 {
1947 return register_netdevice_notifier(&mac80211_netdev_notifier);
1948 }
1949
1950 void ieee80211_iface_exit(void)
1951 {
1952 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1953 }
Linux kernel - Deliverables
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