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Merge tag 'dmaengine-fix-4.4-rc6' of git://git.infradead.org/users/vkoul/slave-dma
[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) ||
80 (update_bss && ieee80211_sdata_running(sdata)))
81 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
82 }
83
84 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
85 {
86 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
87 return 0;
88
89 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
90 return IEEE80211_CONF_CHANGE_IDLE;
91 }
92
93 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
94 {
95 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
96 return 0;
97
98 ieee80211_flush_queues(local, NULL, false);
99
100 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
101 return IEEE80211_CONF_CHANGE_IDLE;
102 }
103
104 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
105 bool force_active)
106 {
107 bool working, scanning, active;
108 unsigned int led_trig_start = 0, led_trig_stop = 0;
109
110 lockdep_assert_held(&local->mtx);
111
112 active = force_active ||
113 !list_empty(&local->chanctx_list) ||
114 local->monitors;
115
116 working = !local->ops->remain_on_channel &&
117 !list_empty(&local->roc_list);
118
119 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122 if (working || scanning)
123 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124 else
125 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127 if (active)
128 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129 else
130 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134 if (working || scanning || active)
135 return __ieee80211_idle_off(local);
136 return __ieee80211_idle_on(local);
137 }
138
139 u32 ieee80211_idle_off(struct ieee80211_local *local)
140 {
141 return __ieee80211_recalc_idle(local, true);
142 }
143
144 void ieee80211_recalc_idle(struct ieee80211_local *local)
145 {
146 u32 change = __ieee80211_recalc_idle(local, false);
147 if (change)
148 ieee80211_hw_config(local, change);
149 }
150
151 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
152 {
153 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
154 return -EINVAL;
155
156 dev->mtu = new_mtu;
157 return 0;
158 }
159
160 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
161 bool check_dup)
162 {
163 struct ieee80211_local *local = sdata->local;
164 struct ieee80211_sub_if_data *iter;
165 u64 new, mask, tmp;
166 u8 *m;
167 int ret = 0;
168
169 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
170 return 0;
171
172 m = addr;
173 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176
177 m = local->hw.wiphy->addr_mask;
178 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182 if (!check_dup)
183 return ret;
184
185 mutex_lock(&local->iflist_mtx);
186 list_for_each_entry(iter, &local->interfaces, list) {
187 if (iter == sdata)
188 continue;
189
190 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
191 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
192 continue;
193
194 m = iter->vif.addr;
195 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
196 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
197 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
198
199 if ((new & ~mask) != (tmp & ~mask)) {
200 ret = -EINVAL;
201 break;
202 }
203 }
204 mutex_unlock(&local->iflist_mtx);
205
206 return ret;
207 }
208
209 static int ieee80211_change_mac(struct net_device *dev, void *addr)
210 {
211 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
212 struct sockaddr *sa = addr;
213 bool check_dup = true;
214 int ret;
215
216 if (ieee80211_sdata_running(sdata))
217 return -EBUSY;
218
219 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
220 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
221 check_dup = false;
222
223 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
224 if (ret)
225 return ret;
226
227 ret = eth_mac_addr(dev, sa);
228
229 if (ret == 0)
230 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
231
232 return ret;
233 }
234
235 static inline int identical_mac_addr_allowed(int type1, int type2)
236 {
237 return type1 == NL80211_IFTYPE_MONITOR ||
238 type2 == NL80211_IFTYPE_MONITOR ||
239 type1 == NL80211_IFTYPE_P2P_DEVICE ||
240 type2 == NL80211_IFTYPE_P2P_DEVICE ||
241 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
242 (type1 == NL80211_IFTYPE_WDS &&
243 (type2 == NL80211_IFTYPE_WDS ||
244 type2 == NL80211_IFTYPE_AP)) ||
245 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
246 (type1 == NL80211_IFTYPE_AP_VLAN &&
247 (type2 == NL80211_IFTYPE_AP ||
248 type2 == NL80211_IFTYPE_AP_VLAN));
249 }
250
251 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
252 enum nl80211_iftype iftype)
253 {
254 struct ieee80211_local *local = sdata->local;
255 struct ieee80211_sub_if_data *nsdata;
256 int ret;
257
258 ASSERT_RTNL();
259
260 /* we hold the RTNL here so can safely walk the list */
261 list_for_each_entry(nsdata, &local->interfaces, list) {
262 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
263 /*
264 * Only OCB and monitor mode may coexist
265 */
266 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
267 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
268 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
269 nsdata->vif.type == NL80211_IFTYPE_OCB))
270 return -EBUSY;
271
272 /*
273 * Allow only a single IBSS interface to be up at any
274 * time. This is restricted because beacon distribution
275 * cannot work properly if both are in the same IBSS.
276 *
277 * To remove this restriction we'd have to disallow them
278 * from setting the same SSID on different IBSS interfaces
279 * belonging to the same hardware. Then, however, we're
280 * faced with having to adopt two different TSF timers...
281 */
282 if (iftype == NL80211_IFTYPE_ADHOC &&
283 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
284 return -EBUSY;
285 /*
286 * will not add another interface while any channel
287 * switch is active.
288 */
289 if (nsdata->vif.csa_active)
290 return -EBUSY;
291
292 /*
293 * The remaining checks are only performed for interfaces
294 * with the same MAC address.
295 */
296 if (!ether_addr_equal(sdata->vif.addr,
297 nsdata->vif.addr))
298 continue;
299
300 /*
301 * check whether it may have the same address
302 */
303 if (!identical_mac_addr_allowed(iftype,
304 nsdata->vif.type))
305 return -ENOTUNIQ;
306
307 /*
308 * can only add VLANs to enabled APs
309 */
310 if (iftype == NL80211_IFTYPE_AP_VLAN &&
311 nsdata->vif.type == NL80211_IFTYPE_AP)
312 sdata->bss = &nsdata->u.ap;
313 }
314 }
315
316 mutex_lock(&local->chanctx_mtx);
317 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
318 mutex_unlock(&local->chanctx_mtx);
319 return ret;
320 }
321
322 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
323 enum nl80211_iftype iftype)
324 {
325 int n_queues = sdata->local->hw.queues;
326 int i;
327
328 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
329 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
331 IEEE80211_INVAL_HW_QUEUE))
332 return -EINVAL;
333 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
334 n_queues))
335 return -EINVAL;
336 }
337 }
338
339 if ((iftype != NL80211_IFTYPE_AP &&
340 iftype != NL80211_IFTYPE_P2P_GO &&
341 iftype != NL80211_IFTYPE_MESH_POINT) ||
342 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
343 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
344 return 0;
345 }
346
347 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
348 return -EINVAL;
349
350 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
351 return -EINVAL;
352
353 return 0;
354 }
355
356 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
357 const int offset)
358 {
359 struct ieee80211_local *local = sdata->local;
360 u32 flags = sdata->u.mntr_flags;
361
362 #define ADJUST(_f, _s) do { \
363 if (flags & MONITOR_FLAG_##_f) \
364 local->fif_##_s += offset; \
365 } while (0)
366
367 ADJUST(FCSFAIL, fcsfail);
368 ADJUST(PLCPFAIL, plcpfail);
369 ADJUST(CONTROL, control);
370 ADJUST(CONTROL, pspoll);
371 ADJUST(OTHER_BSS, other_bss);
372
373 #undef ADJUST
374 }
375
376 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
377 {
378 struct ieee80211_local *local = sdata->local;
379 int i;
380
381 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
382 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
383 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
384 else if (local->hw.queues >= IEEE80211_NUM_ACS)
385 sdata->vif.hw_queue[i] = i;
386 else
387 sdata->vif.hw_queue[i] = 0;
388 }
389 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
390 }
391
392 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
393 {
394 struct ieee80211_sub_if_data *sdata;
395 int ret;
396
397 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
398 return 0;
399
400 ASSERT_RTNL();
401
402 if (local->monitor_sdata)
403 return 0;
404
405 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
406 if (!sdata)
407 return -ENOMEM;
408
409 /* set up data */
410 sdata->local = local;
411 sdata->vif.type = NL80211_IFTYPE_MONITOR;
412 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
413 wiphy_name(local->hw.wiphy));
414 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
415
416 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
417
418 ieee80211_set_default_queues(sdata);
419
420 ret = drv_add_interface(local, sdata);
421 if (WARN_ON(ret)) {
422 /* ok .. stupid driver, it asked for this! */
423 kfree(sdata);
424 return ret;
425 }
426
427 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
428 if (ret) {
429 kfree(sdata);
430 return ret;
431 }
432
433 mutex_lock(&local->iflist_mtx);
434 rcu_assign_pointer(local->monitor_sdata, sdata);
435 mutex_unlock(&local->iflist_mtx);
436
437 mutex_lock(&local->mtx);
438 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
439 IEEE80211_CHANCTX_EXCLUSIVE);
440 mutex_unlock(&local->mtx);
441 if (ret) {
442 mutex_lock(&local->iflist_mtx);
443 RCU_INIT_POINTER(local->monitor_sdata, NULL);
444 mutex_unlock(&local->iflist_mtx);
445 synchronize_net();
446 drv_remove_interface(local, sdata);
447 kfree(sdata);
448 return ret;
449 }
450
451 return 0;
452 }
453
454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
455 {
456 struct ieee80211_sub_if_data *sdata;
457
458 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
459 return;
460
461 ASSERT_RTNL();
462
463 mutex_lock(&local->iflist_mtx);
464
465 sdata = rcu_dereference_protected(local->monitor_sdata,
466 lockdep_is_held(&local->iflist_mtx));
467 if (!sdata) {
468 mutex_unlock(&local->iflist_mtx);
469 return;
470 }
471
472 RCU_INIT_POINTER(local->monitor_sdata, NULL);
473 mutex_unlock(&local->iflist_mtx);
474
475 synchronize_net();
476
477 mutex_lock(&local->mtx);
478 ieee80211_vif_release_channel(sdata);
479 mutex_unlock(&local->mtx);
480
481 drv_remove_interface(local, sdata);
482
483 kfree(sdata);
484 }
485
486 /*
487 * NOTE: Be very careful when changing this function, it must NOT return
488 * an error on interface type changes that have been pre-checked, so most
489 * checks should be in ieee80211_check_concurrent_iface.
490 */
491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
492 {
493 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
494 struct net_device *dev = wdev->netdev;
495 struct ieee80211_local *local = sdata->local;
496 struct sta_info *sta;
497 u32 changed = 0;
498 int res;
499 u32 hw_reconf_flags = 0;
500
501 switch (sdata->vif.type) {
502 case NL80211_IFTYPE_WDS:
503 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
504 return -ENOLINK;
505 break;
506 case NL80211_IFTYPE_AP_VLAN: {
507 struct ieee80211_sub_if_data *master;
508
509 if (!sdata->bss)
510 return -ENOLINK;
511
512 mutex_lock(&local->mtx);
513 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
514 mutex_unlock(&local->mtx);
515
516 master = container_of(sdata->bss,
517 struct ieee80211_sub_if_data, u.ap);
518 sdata->control_port_protocol =
519 master->control_port_protocol;
520 sdata->control_port_no_encrypt =
521 master->control_port_no_encrypt;
522 sdata->vif.cab_queue = master->vif.cab_queue;
523 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524 sizeof(sdata->vif.hw_queue));
525 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
526
527 mutex_lock(&local->key_mtx);
528 sdata->crypto_tx_tailroom_needed_cnt +=
529 master->crypto_tx_tailroom_needed_cnt;
530 mutex_unlock(&local->key_mtx);
531
532 break;
533 }
534 case NL80211_IFTYPE_AP:
535 sdata->bss = &sdata->u.ap;
536 break;
537 case NL80211_IFTYPE_MESH_POINT:
538 case NL80211_IFTYPE_STATION:
539 case NL80211_IFTYPE_MONITOR:
540 case NL80211_IFTYPE_ADHOC:
541 case NL80211_IFTYPE_P2P_DEVICE:
542 case NL80211_IFTYPE_OCB:
543 /* no special treatment */
544 break;
545 case NL80211_IFTYPE_UNSPECIFIED:
546 case NUM_NL80211_IFTYPES:
547 case NL80211_IFTYPE_P2P_CLIENT:
548 case NL80211_IFTYPE_P2P_GO:
549 /* cannot happen */
550 WARN_ON(1);
551 break;
552 }
553
554 if (local->open_count == 0) {
555 res = drv_start(local);
556 if (res)
557 goto err_del_bss;
558 /* we're brought up, everything changes */
559 hw_reconf_flags = ~0;
560 ieee80211_led_radio(local, true);
561 ieee80211_mod_tpt_led_trig(local,
562 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
563 }
564
565 /*
566 * Copy the hopefully now-present MAC address to
567 * this interface, if it has the special null one.
568 */
569 if (dev && is_zero_ether_addr(dev->dev_addr)) {
570 memcpy(dev->dev_addr,
571 local->hw.wiphy->perm_addr,
572 ETH_ALEN);
573 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
574
575 if (!is_valid_ether_addr(dev->dev_addr)) {
576 res = -EADDRNOTAVAIL;
577 goto err_stop;
578 }
579 }
580
581 switch (sdata->vif.type) {
582 case NL80211_IFTYPE_AP_VLAN:
583 /* no need to tell driver, but set carrier and chanctx */
584 if (rtnl_dereference(sdata->bss->beacon)) {
585 ieee80211_vif_vlan_copy_chanctx(sdata);
586 netif_carrier_on(dev);
587 } else {
588 netif_carrier_off(dev);
589 }
590 break;
591 case NL80211_IFTYPE_MONITOR:
592 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
593 local->cooked_mntrs++;
594 break;
595 }
596
597 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
598 res = drv_add_interface(local, sdata);
599 if (res)
600 goto err_stop;
601 } else if (local->monitors == 0 && local->open_count == 0) {
602 res = ieee80211_add_virtual_monitor(local);
603 if (res)
604 goto err_stop;
605 }
606
607 /* must be before the call to ieee80211_configure_filter */
608 local->monitors++;
609 if (local->monitors == 1) {
610 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
611 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
612 }
613
614 ieee80211_adjust_monitor_flags(sdata, 1);
615 ieee80211_configure_filter(local);
616 mutex_lock(&local->mtx);
617 ieee80211_recalc_idle(local);
618 mutex_unlock(&local->mtx);
619
620 netif_carrier_on(dev);
621 break;
622 default:
623 if (coming_up) {
624 ieee80211_del_virtual_monitor(local);
625
626 res = drv_add_interface(local, sdata);
627 if (res)
628 goto err_stop;
629 res = ieee80211_check_queues(sdata,
630 ieee80211_vif_type_p2p(&sdata->vif));
631 if (res)
632 goto err_del_interface;
633 }
634
635 if (sdata->vif.type == NL80211_IFTYPE_AP) {
636 local->fif_pspoll++;
637 local->fif_probe_req++;
638
639 ieee80211_configure_filter(local);
640 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
641 local->fif_probe_req++;
642 }
643
644 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
645 changed |= ieee80211_reset_erp_info(sdata);
646 ieee80211_bss_info_change_notify(sdata, changed);
647
648 switch (sdata->vif.type) {
649 case NL80211_IFTYPE_STATION:
650 case NL80211_IFTYPE_ADHOC:
651 case NL80211_IFTYPE_AP:
652 case NL80211_IFTYPE_MESH_POINT:
653 case NL80211_IFTYPE_OCB:
654 netif_carrier_off(dev);
655 break;
656 case NL80211_IFTYPE_WDS:
657 case NL80211_IFTYPE_P2P_DEVICE:
658 break;
659 default:
660 /* not reached */
661 WARN_ON(1);
662 }
663
664 /*
665 * Set default queue parameters so drivers don't
666 * need to initialise the hardware if the hardware
667 * doesn't start up with sane defaults.
668 * Enable QoS for anything but station interfaces.
669 */
670 ieee80211_set_wmm_default(sdata, true,
671 sdata->vif.type != NL80211_IFTYPE_STATION);
672 }
673
674 set_bit(SDATA_STATE_RUNNING, &sdata->state);
675
676 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
677 /* Create STA entry for the WDS peer */
678 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
679 GFP_KERNEL);
680 if (!sta) {
681 res = -ENOMEM;
682 goto err_del_interface;
683 }
684
685 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
686 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
687 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
688
689 res = sta_info_insert(sta);
690 if (res) {
691 /* STA has been freed */
692 goto err_del_interface;
693 }
694
695 rate_control_rate_init(sta);
696 netif_carrier_on(dev);
697 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
698 rcu_assign_pointer(local->p2p_sdata, sdata);
699 }
700
701 /*
702 * set_multicast_list will be invoked by the networking core
703 * which will check whether any increments here were done in
704 * error and sync them down to the hardware as filter flags.
705 */
706 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
707 atomic_inc(&local->iff_allmultis);
708
709 if (coming_up)
710 local->open_count++;
711
712 if (hw_reconf_flags)
713 ieee80211_hw_config(local, hw_reconf_flags);
714
715 ieee80211_recalc_ps(local);
716
717 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
718 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
719 /* XXX: for AP_VLAN, actually track AP queues */
720 netif_tx_start_all_queues(dev);
721 } else if (dev) {
722 unsigned long flags;
723 int n_acs = IEEE80211_NUM_ACS;
724 int ac;
725
726 if (local->hw.queues < IEEE80211_NUM_ACS)
727 n_acs = 1;
728
729 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
730 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
731 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
732 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
733 for (ac = 0; ac < n_acs; ac++) {
734 int ac_queue = sdata->vif.hw_queue[ac];
735
736 if (local->queue_stop_reasons[ac_queue] == 0 &&
737 skb_queue_empty(&local->pending[ac_queue]))
738 netif_start_subqueue(dev, ac);
739 }
740 }
741 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
742 }
743
744 return 0;
745 err_del_interface:
746 drv_remove_interface(local, sdata);
747 err_stop:
748 if (!local->open_count)
749 drv_stop(local);
750 err_del_bss:
751 sdata->bss = NULL;
752 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
753 mutex_lock(&local->mtx);
754 list_del(&sdata->u.vlan.list);
755 mutex_unlock(&local->mtx);
756 }
757 /* might already be clear but that doesn't matter */
758 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
759 return res;
760 }
761
762 static int ieee80211_open(struct net_device *dev)
763 {
764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
765 int err;
766
767 /* fail early if user set an invalid address */
768 if (!is_valid_ether_addr(dev->dev_addr))
769 return -EADDRNOTAVAIL;
770
771 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
772 if (err)
773 return err;
774
775 return ieee80211_do_open(&sdata->wdev, true);
776 }
777
778 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
779 bool going_down)
780 {
781 struct ieee80211_local *local = sdata->local;
782 unsigned long flags;
783 struct sk_buff *skb, *tmp;
784 u32 hw_reconf_flags = 0;
785 int i, flushed;
786 struct ps_data *ps;
787 struct cfg80211_chan_def chandef;
788 bool cancel_scan;
789
790 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
791
792 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
793 if (cancel_scan)
794 ieee80211_scan_cancel(local);
795
796 /*
797 * Stop TX on this interface first.
798 */
799 if (sdata->dev)
800 netif_tx_stop_all_queues(sdata->dev);
801
802 ieee80211_roc_purge(local, sdata);
803
804 switch (sdata->vif.type) {
805 case NL80211_IFTYPE_STATION:
806 ieee80211_mgd_stop(sdata);
807 break;
808 case NL80211_IFTYPE_ADHOC:
809 ieee80211_ibss_stop(sdata);
810 break;
811 case NL80211_IFTYPE_AP:
812 cancel_work_sync(&sdata->u.ap.request_smps_work);
813 break;
814 default:
815 break;
816 }
817
818 /*
819 * Remove all stations associated with this interface.
820 *
821 * This must be done before calling ops->remove_interface()
822 * because otherwise we can later invoke ops->sta_notify()
823 * whenever the STAs are removed, and that invalidates driver
824 * assumptions about always getting a vif pointer that is valid
825 * (because if we remove a STA after ops->remove_interface()
826 * the driver will have removed the vif info already!)
827 *
828 * In WDS mode a station must exist here and be flushed, for
829 * AP_VLANs stations may exist since there's nothing else that
830 * would have removed them, but in other modes there shouldn't
831 * be any stations.
832 */
833 flushed = sta_info_flush(sdata);
834 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
835 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
836 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
837
838 /* don't count this interface for allmulti while it is down */
839 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
840 atomic_dec(&local->iff_allmultis);
841
842 if (sdata->vif.type == NL80211_IFTYPE_AP) {
843 local->fif_pspoll--;
844 local->fif_probe_req--;
845 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
846 local->fif_probe_req--;
847 }
848
849 if (sdata->dev) {
850 netif_addr_lock_bh(sdata->dev);
851 spin_lock_bh(&local->filter_lock);
852 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
853 sdata->dev->addr_len);
854 spin_unlock_bh(&local->filter_lock);
855 netif_addr_unlock_bh(sdata->dev);
856 }
857
858 del_timer_sync(&local->dynamic_ps_timer);
859 cancel_work_sync(&local->dynamic_ps_enable_work);
860
861 cancel_work_sync(&sdata->recalc_smps);
862 sdata_lock(sdata);
863 mutex_lock(&local->mtx);
864 sdata->vif.csa_active = false;
865 if (sdata->vif.type == NL80211_IFTYPE_STATION)
866 sdata->u.mgd.csa_waiting_bcn = false;
867 if (sdata->csa_block_tx) {
868 ieee80211_wake_vif_queues(local, sdata,
869 IEEE80211_QUEUE_STOP_REASON_CSA);
870 sdata->csa_block_tx = false;
871 }
872 mutex_unlock(&local->mtx);
873 sdata_unlock(sdata);
874
875 cancel_work_sync(&sdata->csa_finalize_work);
876
877 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
878
879 if (sdata->wdev.cac_started) {
880 chandef = sdata->vif.bss_conf.chandef;
881 WARN_ON(local->suspended);
882 mutex_lock(&local->mtx);
883 ieee80211_vif_release_channel(sdata);
884 mutex_unlock(&local->mtx);
885 cfg80211_cac_event(sdata->dev, &chandef,
886 NL80211_RADAR_CAC_ABORTED,
887 GFP_KERNEL);
888 }
889
890 /* APs need special treatment */
891 if (sdata->vif.type == NL80211_IFTYPE_AP) {
892 struct ieee80211_sub_if_data *vlan, *tmpsdata;
893
894 /* down all dependent devices, that is VLANs */
895 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
896 u.vlan.list)
897 dev_close(vlan->dev);
898 WARN_ON(!list_empty(&sdata->u.ap.vlans));
899 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
900 /* remove all packets in parent bc_buf pointing to this dev */
901 ps = &sdata->bss->ps;
902
903 spin_lock_irqsave(&ps->bc_buf.lock, flags);
904 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
905 if (skb->dev == sdata->dev) {
906 __skb_unlink(skb, &ps->bc_buf);
907 local->total_ps_buffered--;
908 ieee80211_free_txskb(&local->hw, skb);
909 }
910 }
911 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
912 }
913
914 if (going_down)
915 local->open_count--;
916
917 switch (sdata->vif.type) {
918 case NL80211_IFTYPE_AP_VLAN:
919 mutex_lock(&local->mtx);
920 list_del(&sdata->u.vlan.list);
921 mutex_unlock(&local->mtx);
922 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
923 /* see comment in the default case below */
924 ieee80211_free_keys(sdata, true);
925 /* no need to tell driver */
926 break;
927 case NL80211_IFTYPE_MONITOR:
928 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
929 local->cooked_mntrs--;
930 break;
931 }
932
933 local->monitors--;
934 if (local->monitors == 0) {
935 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
936 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
937 }
938
939 ieee80211_adjust_monitor_flags(sdata, -1);
940 break;
941 case NL80211_IFTYPE_P2P_DEVICE:
942 /* relies on synchronize_rcu() below */
943 RCU_INIT_POINTER(local->p2p_sdata, NULL);
944 /* fall through */
945 default:
946 cancel_work_sync(&sdata->work);
947 /*
948 * When we get here, the interface is marked down.
949 * Free the remaining keys, if there are any
950 * (which can happen in AP mode if userspace sets
951 * keys before the interface is operating, and maybe
952 * also in WDS mode)
953 *
954 * Force the key freeing to always synchronize_net()
955 * to wait for the RX path in case it is using this
956 * interface enqueuing frames at this very time on
957 * another CPU.
958 */
959 ieee80211_free_keys(sdata, true);
960 skb_queue_purge(&sdata->skb_queue);
961 }
962
963 sdata->bss = NULL;
964
965 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
966 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
967 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
968 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
969 if (info->control.vif == &sdata->vif) {
970 __skb_unlink(skb, &local->pending[i]);
971 ieee80211_free_txskb(&local->hw, skb);
972 }
973 }
974 }
975 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
976
977 if (sdata->vif.txq) {
978 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
979
980 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
981 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
982 }
983
984 if (local->open_count == 0)
985 ieee80211_clear_tx_pending(local);
986
987 /*
988 * If the interface goes down while suspended, presumably because
989 * the device was unplugged and that happens before our resume,
990 * then the driver is already unconfigured and the remainder of
991 * this function isn't needed.
992 * XXX: what about WoWLAN? If the device has software state, e.g.
993 * memory allocated, it might expect teardown commands from
994 * mac80211 here?
995 */
996 if (local->suspended) {
997 WARN_ON(local->wowlan);
998 WARN_ON(rtnl_dereference(local->monitor_sdata));
999 return;
1000 }
1001
1002 switch (sdata->vif.type) {
1003 case NL80211_IFTYPE_AP_VLAN:
1004 break;
1005 case NL80211_IFTYPE_MONITOR:
1006 if (local->monitors == 0)
1007 ieee80211_del_virtual_monitor(local);
1008
1009 mutex_lock(&local->mtx);
1010 ieee80211_recalc_idle(local);
1011 mutex_unlock(&local->mtx);
1012
1013 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1014 break;
1015
1016 /* fall through */
1017 default:
1018 if (going_down)
1019 drv_remove_interface(local, sdata);
1020 }
1021
1022 ieee80211_recalc_ps(local);
1023
1024 if (cancel_scan)
1025 flush_delayed_work(&local->scan_work);
1026
1027 if (local->open_count == 0) {
1028 ieee80211_stop_device(local);
1029
1030 /* no reconfiguring after stop! */
1031 return;
1032 }
1033
1034 /* do after stop to avoid reconfiguring when we stop anyway */
1035 ieee80211_configure_filter(local);
1036 ieee80211_hw_config(local, hw_reconf_flags);
1037
1038 if (local->monitors == local->open_count)
1039 ieee80211_add_virtual_monitor(local);
1040 }
1041
1042 static int ieee80211_stop(struct net_device *dev)
1043 {
1044 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1045
1046 ieee80211_do_stop(sdata, true);
1047
1048 return 0;
1049 }
1050
1051 static void ieee80211_set_multicast_list(struct net_device *dev)
1052 {
1053 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1054 struct ieee80211_local *local = sdata->local;
1055 int allmulti, sdata_allmulti;
1056
1057 allmulti = !!(dev->flags & IFF_ALLMULTI);
1058 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1059
1060 if (allmulti != sdata_allmulti) {
1061 if (dev->flags & IFF_ALLMULTI)
1062 atomic_inc(&local->iff_allmultis);
1063 else
1064 atomic_dec(&local->iff_allmultis);
1065 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1066 }
1067
1068 spin_lock_bh(&local->filter_lock);
1069 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1070 spin_unlock_bh(&local->filter_lock);
1071 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1072 }
1073
1074 /*
1075 * Called when the netdev is removed or, by the code below, before
1076 * the interface type changes.
1077 */
1078 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1079 {
1080 int i;
1081
1082 /* free extra data */
1083 ieee80211_free_keys(sdata, false);
1084
1085 ieee80211_debugfs_remove_netdev(sdata);
1086
1087 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1088 __skb_queue_purge(&sdata->fragments[i].skb_list);
1089 sdata->fragment_next = 0;
1090
1091 if (ieee80211_vif_is_mesh(&sdata->vif))
1092 mesh_rmc_free(sdata);
1093 }
1094
1095 static void ieee80211_uninit(struct net_device *dev)
1096 {
1097 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1098 }
1099
1100 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1101 struct sk_buff *skb,
1102 void *accel_priv,
1103 select_queue_fallback_t fallback)
1104 {
1105 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1106 }
1107
1108 static struct rtnl_link_stats64 *
1109 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1110 {
1111 int i;
1112
1113 for_each_possible_cpu(i) {
1114 const struct pcpu_sw_netstats *tstats;
1115 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1116 unsigned int start;
1117
1118 tstats = per_cpu_ptr(dev->tstats, i);
1119
1120 do {
1121 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1122 rx_packets = tstats->rx_packets;
1123 tx_packets = tstats->tx_packets;
1124 rx_bytes = tstats->rx_bytes;
1125 tx_bytes = tstats->tx_bytes;
1126 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1127
1128 stats->rx_packets += rx_packets;
1129 stats->tx_packets += tx_packets;
1130 stats->rx_bytes += rx_bytes;
1131 stats->tx_bytes += tx_bytes;
1132 }
1133
1134 return stats;
1135 }
1136
1137 static const struct net_device_ops ieee80211_dataif_ops = {
1138 .ndo_open = ieee80211_open,
1139 .ndo_stop = ieee80211_stop,
1140 .ndo_uninit = ieee80211_uninit,
1141 .ndo_start_xmit = ieee80211_subif_start_xmit,
1142 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1143 .ndo_change_mtu = ieee80211_change_mtu,
1144 .ndo_set_mac_address = ieee80211_change_mac,
1145 .ndo_select_queue = ieee80211_netdev_select_queue,
1146 .ndo_get_stats64 = ieee80211_get_stats64,
1147 };
1148
1149 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1150 struct sk_buff *skb,
1151 void *accel_priv,
1152 select_queue_fallback_t fallback)
1153 {
1154 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1155 struct ieee80211_local *local = sdata->local;
1156 struct ieee80211_hdr *hdr;
1157 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1158
1159 if (local->hw.queues < IEEE80211_NUM_ACS)
1160 return 0;
1161
1162 if (skb->len < 4 ||
1163 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1164 return 0; /* doesn't matter, frame will be dropped */
1165
1166 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1167
1168 return ieee80211_select_queue_80211(sdata, skb, hdr);
1169 }
1170
1171 static const struct net_device_ops ieee80211_monitorif_ops = {
1172 .ndo_open = ieee80211_open,
1173 .ndo_stop = ieee80211_stop,
1174 .ndo_uninit = ieee80211_uninit,
1175 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1176 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1177 .ndo_change_mtu = ieee80211_change_mtu,
1178 .ndo_set_mac_address = ieee80211_change_mac,
1179 .ndo_select_queue = ieee80211_monitor_select_queue,
1180 .ndo_get_stats64 = ieee80211_get_stats64,
1181 };
1182
1183 static void ieee80211_if_free(struct net_device *dev)
1184 {
1185 free_percpu(dev->tstats);
1186 free_netdev(dev);
1187 }
1188
1189 static void ieee80211_if_setup(struct net_device *dev)
1190 {
1191 ether_setup(dev);
1192 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1193 dev->netdev_ops = &ieee80211_dataif_ops;
1194 dev->destructor = ieee80211_if_free;
1195 }
1196
1197 static void ieee80211_iface_work(struct work_struct *work)
1198 {
1199 struct ieee80211_sub_if_data *sdata =
1200 container_of(work, struct ieee80211_sub_if_data, work);
1201 struct ieee80211_local *local = sdata->local;
1202 struct sk_buff *skb;
1203 struct sta_info *sta;
1204 struct ieee80211_ra_tid *ra_tid;
1205 struct ieee80211_rx_agg *rx_agg;
1206
1207 if (!ieee80211_sdata_running(sdata))
1208 return;
1209
1210 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1211 return;
1212
1213 if (!ieee80211_can_run_worker(local))
1214 return;
1215
1216 /* first process frames */
1217 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1218 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1219
1220 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1221 ra_tid = (void *)&skb->cb;
1222 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1223 ra_tid->tid);
1224 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1225 ra_tid = (void *)&skb->cb;
1226 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1227 ra_tid->tid);
1228 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1229 rx_agg = (void *)&skb->cb;
1230 mutex_lock(&local->sta_mtx);
1231 sta = sta_info_get_bss(sdata, rx_agg->addr);
1232 if (sta)
1233 __ieee80211_start_rx_ba_session(sta,
1234 0, 0, 0, 1, rx_agg->tid,
1235 IEEE80211_MAX_AMPDU_BUF,
1236 false, true);
1237 mutex_unlock(&local->sta_mtx);
1238 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1239 rx_agg = (void *)&skb->cb;
1240 mutex_lock(&local->sta_mtx);
1241 sta = sta_info_get_bss(sdata, rx_agg->addr);
1242 if (sta)
1243 __ieee80211_stop_rx_ba_session(sta,
1244 rx_agg->tid,
1245 WLAN_BACK_RECIPIENT, 0,
1246 false);
1247 mutex_unlock(&local->sta_mtx);
1248 } else if (ieee80211_is_action(mgmt->frame_control) &&
1249 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1250 int len = skb->len;
1251
1252 mutex_lock(&local->sta_mtx);
1253 sta = sta_info_get_bss(sdata, mgmt->sa);
1254 if (sta) {
1255 switch (mgmt->u.action.u.addba_req.action_code) {
1256 case WLAN_ACTION_ADDBA_REQ:
1257 ieee80211_process_addba_request(
1258 local, sta, mgmt, len);
1259 break;
1260 case WLAN_ACTION_ADDBA_RESP:
1261 ieee80211_process_addba_resp(local, sta,
1262 mgmt, len);
1263 break;
1264 case WLAN_ACTION_DELBA:
1265 ieee80211_process_delba(sdata, sta,
1266 mgmt, len);
1267 break;
1268 default:
1269 WARN_ON(1);
1270 break;
1271 }
1272 }
1273 mutex_unlock(&local->sta_mtx);
1274 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1275 struct ieee80211_hdr *hdr = (void *)mgmt;
1276 /*
1277 * So the frame isn't mgmt, but frame_control
1278 * is at the right place anyway, of course, so
1279 * the if statement is correct.
1280 *
1281 * Warn if we have other data frame types here,
1282 * they must not get here.
1283 */
1284 WARN_ON(hdr->frame_control &
1285 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1286 WARN_ON(!(hdr->seq_ctrl &
1287 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1288 /*
1289 * This was a fragment of a frame, received while
1290 * a block-ack session was active. That cannot be
1291 * right, so terminate the session.
1292 */
1293 mutex_lock(&local->sta_mtx);
1294 sta = sta_info_get_bss(sdata, mgmt->sa);
1295 if (sta) {
1296 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1297 IEEE80211_QOS_CTL_TID_MASK;
1298
1299 __ieee80211_stop_rx_ba_session(
1300 sta, tid, WLAN_BACK_RECIPIENT,
1301 WLAN_REASON_QSTA_REQUIRE_SETUP,
1302 true);
1303 }
1304 mutex_unlock(&local->sta_mtx);
1305 } else switch (sdata->vif.type) {
1306 case NL80211_IFTYPE_STATION:
1307 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1308 break;
1309 case NL80211_IFTYPE_ADHOC:
1310 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1311 break;
1312 case NL80211_IFTYPE_MESH_POINT:
1313 if (!ieee80211_vif_is_mesh(&sdata->vif))
1314 break;
1315 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1316 break;
1317 default:
1318 WARN(1, "frame for unexpected interface type");
1319 break;
1320 }
1321
1322 kfree_skb(skb);
1323 }
1324
1325 /* then other type-dependent work */
1326 switch (sdata->vif.type) {
1327 case NL80211_IFTYPE_STATION:
1328 ieee80211_sta_work(sdata);
1329 break;
1330 case NL80211_IFTYPE_ADHOC:
1331 ieee80211_ibss_work(sdata);
1332 break;
1333 case NL80211_IFTYPE_MESH_POINT:
1334 if (!ieee80211_vif_is_mesh(&sdata->vif))
1335 break;
1336 ieee80211_mesh_work(sdata);
1337 break;
1338 case NL80211_IFTYPE_OCB:
1339 ieee80211_ocb_work(sdata);
1340 break;
1341 default:
1342 break;
1343 }
1344 }
1345
1346 static void ieee80211_recalc_smps_work(struct work_struct *work)
1347 {
1348 struct ieee80211_sub_if_data *sdata =
1349 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1350
1351 ieee80211_recalc_smps(sdata);
1352 }
1353
1354 /*
1355 * Helper function to initialise an interface to a specific type.
1356 */
1357 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1358 enum nl80211_iftype type)
1359 {
1360 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1361 0xff, 0xff, 0xff};
1362
1363 /* clear type-dependent union */
1364 memset(&sdata->u, 0, sizeof(sdata->u));
1365
1366 /* and set some type-dependent values */
1367 sdata->vif.type = type;
1368 sdata->vif.p2p = false;
1369 sdata->wdev.iftype = type;
1370
1371 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1372 sdata->control_port_no_encrypt = false;
1373 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1374 sdata->vif.bss_conf.idle = true;
1375
1376 sdata->noack_map = 0;
1377
1378 /* only monitor/p2p-device differ */
1379 if (sdata->dev) {
1380 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1381 sdata->dev->type = ARPHRD_ETHER;
1382 }
1383
1384 skb_queue_head_init(&sdata->skb_queue);
1385 INIT_WORK(&sdata->work, ieee80211_iface_work);
1386 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1387 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1388 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1389 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1390
1391 switch (type) {
1392 case NL80211_IFTYPE_P2P_GO:
1393 type = NL80211_IFTYPE_AP;
1394 sdata->vif.type = type;
1395 sdata->vif.p2p = true;
1396 /* fall through */
1397 case NL80211_IFTYPE_AP:
1398 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1399 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1400 INIT_WORK(&sdata->u.ap.request_smps_work,
1401 ieee80211_request_smps_ap_work);
1402 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1403 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1404 break;
1405 case NL80211_IFTYPE_P2P_CLIENT:
1406 type = NL80211_IFTYPE_STATION;
1407 sdata->vif.type = type;
1408 sdata->vif.p2p = true;
1409 /* fall through */
1410 case NL80211_IFTYPE_STATION:
1411 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1412 ieee80211_sta_setup_sdata(sdata);
1413 break;
1414 case NL80211_IFTYPE_OCB:
1415 sdata->vif.bss_conf.bssid = bssid_wildcard;
1416 ieee80211_ocb_setup_sdata(sdata);
1417 break;
1418 case NL80211_IFTYPE_ADHOC:
1419 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1420 ieee80211_ibss_setup_sdata(sdata);
1421 break;
1422 case NL80211_IFTYPE_MESH_POINT:
1423 if (ieee80211_vif_is_mesh(&sdata->vif))
1424 ieee80211_mesh_init_sdata(sdata);
1425 break;
1426 case NL80211_IFTYPE_MONITOR:
1427 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1428 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1429 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1430 MONITOR_FLAG_OTHER_BSS;
1431 break;
1432 case NL80211_IFTYPE_WDS:
1433 sdata->vif.bss_conf.bssid = NULL;
1434 break;
1435 case NL80211_IFTYPE_AP_VLAN:
1436 case NL80211_IFTYPE_P2P_DEVICE:
1437 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1438 break;
1439 case NL80211_IFTYPE_UNSPECIFIED:
1440 case NUM_NL80211_IFTYPES:
1441 BUG();
1442 break;
1443 }
1444
1445 ieee80211_debugfs_add_netdev(sdata);
1446 }
1447
1448 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1449 enum nl80211_iftype type)
1450 {
1451 struct ieee80211_local *local = sdata->local;
1452 int ret, err;
1453 enum nl80211_iftype internal_type = type;
1454 bool p2p = false;
1455
1456 ASSERT_RTNL();
1457
1458 if (!local->ops->change_interface)
1459 return -EBUSY;
1460
1461 switch (sdata->vif.type) {
1462 case NL80211_IFTYPE_AP:
1463 case NL80211_IFTYPE_STATION:
1464 case NL80211_IFTYPE_ADHOC:
1465 case NL80211_IFTYPE_OCB:
1466 /*
1467 * Could maybe also all others here?
1468 * Just not sure how that interacts
1469 * with the RX/config path e.g. for
1470 * mesh.
1471 */
1472 break;
1473 default:
1474 return -EBUSY;
1475 }
1476
1477 switch (type) {
1478 case NL80211_IFTYPE_AP:
1479 case NL80211_IFTYPE_STATION:
1480 case NL80211_IFTYPE_ADHOC:
1481 case NL80211_IFTYPE_OCB:
1482 /*
1483 * Could probably support everything
1484 * but WDS here (WDS do_open can fail
1485 * under memory pressure, which this
1486 * code isn't prepared to handle).
1487 */
1488 break;
1489 case NL80211_IFTYPE_P2P_CLIENT:
1490 p2p = true;
1491 internal_type = NL80211_IFTYPE_STATION;
1492 break;
1493 case NL80211_IFTYPE_P2P_GO:
1494 p2p = true;
1495 internal_type = NL80211_IFTYPE_AP;
1496 break;
1497 default:
1498 return -EBUSY;
1499 }
1500
1501 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1502 if (ret)
1503 return ret;
1504
1505 ieee80211_do_stop(sdata, false);
1506
1507 ieee80211_teardown_sdata(sdata);
1508
1509 ret = drv_change_interface(local, sdata, internal_type, p2p);
1510 if (ret)
1511 type = ieee80211_vif_type_p2p(&sdata->vif);
1512
1513 /*
1514 * Ignore return value here, there's not much we can do since
1515 * the driver changed the interface type internally already.
1516 * The warnings will hopefully make driver authors fix it :-)
1517 */
1518 ieee80211_check_queues(sdata, type);
1519
1520 ieee80211_setup_sdata(sdata, type);
1521
1522 err = ieee80211_do_open(&sdata->wdev, false);
1523 WARN(err, "type change: do_open returned %d", err);
1524
1525 return ret;
1526 }
1527
1528 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1529 enum nl80211_iftype type)
1530 {
1531 int ret;
1532
1533 ASSERT_RTNL();
1534
1535 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1536 return 0;
1537
1538 if (ieee80211_sdata_running(sdata)) {
1539 ret = ieee80211_runtime_change_iftype(sdata, type);
1540 if (ret)
1541 return ret;
1542 } else {
1543 /* Purge and reset type-dependent state. */
1544 ieee80211_teardown_sdata(sdata);
1545 ieee80211_setup_sdata(sdata, type);
1546 }
1547
1548 /* reset some values that shouldn't be kept across type changes */
1549 if (type == NL80211_IFTYPE_STATION)
1550 sdata->u.mgd.use_4addr = false;
1551
1552 return 0;
1553 }
1554
1555 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1556 u8 *perm_addr, enum nl80211_iftype type)
1557 {
1558 struct ieee80211_sub_if_data *sdata;
1559 u64 mask, start, addr, val, inc;
1560 u8 *m;
1561 u8 tmp_addr[ETH_ALEN];
1562 int i;
1563
1564 /* default ... something at least */
1565 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1566
1567 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1568 local->hw.wiphy->n_addresses <= 1)
1569 return;
1570
1571 mutex_lock(&local->iflist_mtx);
1572
1573 switch (type) {
1574 case NL80211_IFTYPE_MONITOR:
1575 /* doesn't matter */
1576 break;
1577 case NL80211_IFTYPE_WDS:
1578 case NL80211_IFTYPE_AP_VLAN:
1579 /* match up with an AP interface */
1580 list_for_each_entry(sdata, &local->interfaces, list) {
1581 if (sdata->vif.type != NL80211_IFTYPE_AP)
1582 continue;
1583 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1584 break;
1585 }
1586 /* keep default if no AP interface present */
1587 break;
1588 case NL80211_IFTYPE_P2P_CLIENT:
1589 case NL80211_IFTYPE_P2P_GO:
1590 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1591 list_for_each_entry(sdata, &local->interfaces, list) {
1592 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1593 continue;
1594 if (!ieee80211_sdata_running(sdata))
1595 continue;
1596 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1597 goto out_unlock;
1598 }
1599 }
1600 /* otherwise fall through */
1601 default:
1602 /* assign a new address if possible -- try n_addresses first */
1603 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1604 bool used = false;
1605
1606 list_for_each_entry(sdata, &local->interfaces, list) {
1607 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1608 sdata->vif.addr)) {
1609 used = true;
1610 break;
1611 }
1612 }
1613
1614 if (!used) {
1615 memcpy(perm_addr,
1616 local->hw.wiphy->addresses[i].addr,
1617 ETH_ALEN);
1618 break;
1619 }
1620 }
1621
1622 /* try mask if available */
1623 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1624 break;
1625
1626 m = local->hw.wiphy->addr_mask;
1627 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1628 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1629 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1630
1631 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1632 /* not a contiguous mask ... not handled now! */
1633 pr_info("not contiguous\n");
1634 break;
1635 }
1636
1637 /*
1638 * Pick address of existing interface in case user changed
1639 * MAC address manually, default to perm_addr.
1640 */
1641 m = local->hw.wiphy->perm_addr;
1642 list_for_each_entry(sdata, &local->interfaces, list) {
1643 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1644 continue;
1645 m = sdata->vif.addr;
1646 break;
1647 }
1648 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1649 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1650 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1651
1652 inc = 1ULL<<__ffs64(mask);
1653 val = (start & mask);
1654 addr = (start & ~mask) | (val & mask);
1655 do {
1656 bool used = false;
1657
1658 tmp_addr[5] = addr >> 0*8;
1659 tmp_addr[4] = addr >> 1*8;
1660 tmp_addr[3] = addr >> 2*8;
1661 tmp_addr[2] = addr >> 3*8;
1662 tmp_addr[1] = addr >> 4*8;
1663 tmp_addr[0] = addr >> 5*8;
1664
1665 val += inc;
1666
1667 list_for_each_entry(sdata, &local->interfaces, list) {
1668 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1669 used = true;
1670 break;
1671 }
1672 }
1673
1674 if (!used) {
1675 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1676 break;
1677 }
1678 addr = (start & ~mask) | (val & mask);
1679 } while (addr != start);
1680
1681 break;
1682 }
1683
1684 out_unlock:
1685 mutex_unlock(&local->iflist_mtx);
1686 }
1687
1688 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1689 unsigned char name_assign_type,
1690 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1691 struct vif_params *params)
1692 {
1693 struct net_device *ndev = NULL;
1694 struct ieee80211_sub_if_data *sdata = NULL;
1695 struct txq_info *txqi;
1696 int ret, i;
1697 int txqs = 1;
1698
1699 ASSERT_RTNL();
1700
1701 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1702 struct wireless_dev *wdev;
1703
1704 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1705 GFP_KERNEL);
1706 if (!sdata)
1707 return -ENOMEM;
1708 wdev = &sdata->wdev;
1709
1710 sdata->dev = NULL;
1711 strlcpy(sdata->name, name, IFNAMSIZ);
1712 ieee80211_assign_perm_addr(local, wdev->address, type);
1713 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1714 } else {
1715 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1716 sizeof(void *));
1717 int txq_size = 0;
1718
1719 if (local->ops->wake_tx_queue)
1720 txq_size += sizeof(struct txq_info) +
1721 local->hw.txq_data_size;
1722
1723 if (local->hw.queues >= IEEE80211_NUM_ACS)
1724 txqs = IEEE80211_NUM_ACS;
1725
1726 ndev = alloc_netdev_mqs(size + txq_size,
1727 name, name_assign_type,
1728 ieee80211_if_setup, txqs, 1);
1729 if (!ndev)
1730 return -ENOMEM;
1731 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1732
1733 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1734 if (!ndev->tstats) {
1735 free_netdev(ndev);
1736 return -ENOMEM;
1737 }
1738
1739 ndev->needed_headroom = local->tx_headroom +
1740 4*6 /* four MAC addresses */
1741 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1742 + 6 /* mesh */
1743 + 8 /* rfc1042/bridge tunnel */
1744 - ETH_HLEN /* ethernet hard_header_len */
1745 + IEEE80211_ENCRYPT_HEADROOM;
1746 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1747
1748 ret = dev_alloc_name(ndev, ndev->name);
1749 if (ret < 0) {
1750 free_netdev(ndev);
1751 return ret;
1752 }
1753
1754 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1755 if (params && is_valid_ether_addr(params->macaddr))
1756 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1757 else
1758 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1759 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1760
1761 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1762 sdata = netdev_priv(ndev);
1763 ndev->ieee80211_ptr = &sdata->wdev;
1764 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1765 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1766
1767 if (txq_size) {
1768 txqi = netdev_priv(ndev) + size;
1769 ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1770 }
1771
1772 sdata->dev = ndev;
1773 }
1774
1775 /* initialise type-independent data */
1776 sdata->wdev.wiphy = local->hw.wiphy;
1777 sdata->local = local;
1778
1779 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1780 skb_queue_head_init(&sdata->fragments[i].skb_list);
1781
1782 INIT_LIST_HEAD(&sdata->key_list);
1783
1784 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1785 ieee80211_dfs_cac_timer_work);
1786 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1787 ieee80211_delayed_tailroom_dec);
1788
1789 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1790 struct ieee80211_supported_band *sband;
1791 sband = local->hw.wiphy->bands[i];
1792 sdata->rc_rateidx_mask[i] =
1793 sband ? (1 << sband->n_bitrates) - 1 : 0;
1794 if (sband) {
1795 __le16 cap;
1796 u16 *vht_rate_mask;
1797
1798 memcpy(sdata->rc_rateidx_mcs_mask[i],
1799 sband->ht_cap.mcs.rx_mask,
1800 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1801
1802 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1803 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1804 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1805 } else {
1806 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1807 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1808 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1809 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1810 }
1811 }
1812
1813 ieee80211_set_default_queues(sdata);
1814
1815 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1816 sdata->user_power_level = local->user_power_level;
1817
1818 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1819
1820 /* setup type-dependent data */
1821 ieee80211_setup_sdata(sdata, type);
1822
1823 if (ndev) {
1824 if (params) {
1825 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1826 if (type == NL80211_IFTYPE_STATION)
1827 sdata->u.mgd.use_4addr = params->use_4addr;
1828 }
1829
1830 ndev->features |= local->hw.netdev_features;
1831
1832 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1833
1834 ret = register_netdevice(ndev);
1835 if (ret) {
1836 free_netdev(ndev);
1837 return ret;
1838 }
1839 }
1840
1841 mutex_lock(&local->iflist_mtx);
1842 list_add_tail_rcu(&sdata->list, &local->interfaces);
1843 mutex_unlock(&local->iflist_mtx);
1844
1845 if (new_wdev)
1846 *new_wdev = &sdata->wdev;
1847
1848 return 0;
1849 }
1850
1851 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1852 {
1853 ASSERT_RTNL();
1854
1855 mutex_lock(&sdata->local->iflist_mtx);
1856 list_del_rcu(&sdata->list);
1857 mutex_unlock(&sdata->local->iflist_mtx);
1858
1859 synchronize_rcu();
1860
1861 if (sdata->dev) {
1862 unregister_netdevice(sdata->dev);
1863 } else {
1864 cfg80211_unregister_wdev(&sdata->wdev);
1865 ieee80211_teardown_sdata(sdata);
1866 kfree(sdata);
1867 }
1868 }
1869
1870 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1871 {
1872 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1873 return;
1874 ieee80211_do_stop(sdata, true);
1875 }
1876
1877 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1878 {
1879 struct ieee80211_sub_if_data *sdata, *tmp;
1880 LIST_HEAD(unreg_list);
1881 LIST_HEAD(wdev_list);
1882
1883 ASSERT_RTNL();
1884
1885 /* Before destroying the interfaces, make sure they're all stopped so
1886 * that the hardware is stopped. Otherwise, the driver might still be
1887 * iterating the interfaces during the shutdown, e.g. from a worker
1888 * or from RX processing or similar, and if it does so (using atomic
1889 * iteration) while we're manipulating the list, the iteration will
1890 * crash.
1891 *
1892 * After this, the hardware should be stopped and the driver should
1893 * have stopped all of its activities, so that we can do RCU-unaware
1894 * manipulations of the interface list below.
1895 */
1896 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1897
1898 WARN(local->open_count, "%s: open count remains %d\n",
1899 wiphy_name(local->hw.wiphy), local->open_count);
1900
1901 mutex_lock(&local->iflist_mtx);
1902 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1903 list_del(&sdata->list);
1904
1905 if (sdata->dev)
1906 unregister_netdevice_queue(sdata->dev, &unreg_list);
1907 else
1908 list_add(&sdata->list, &wdev_list);
1909 }
1910 mutex_unlock(&local->iflist_mtx);
1911 unregister_netdevice_many(&unreg_list);
1912
1913 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1914 list_del(&sdata->list);
1915 cfg80211_unregister_wdev(&sdata->wdev);
1916 kfree(sdata);
1917 }
1918 }
1919
1920 static int netdev_notify(struct notifier_block *nb,
1921 unsigned long state, void *ptr)
1922 {
1923 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1924 struct ieee80211_sub_if_data *sdata;
1925
1926 if (state != NETDEV_CHANGENAME)
1927 return NOTIFY_DONE;
1928
1929 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1930 return NOTIFY_DONE;
1931
1932 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1933 return NOTIFY_DONE;
1934
1935 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1936 memcpy(sdata->name, dev->name, IFNAMSIZ);
1937 ieee80211_debugfs_rename_netdev(sdata);
1938
1939 return NOTIFY_OK;
1940 }
1941
1942 static struct notifier_block mac80211_netdev_notifier = {
1943 .notifier_call = netdev_notify,
1944 };
1945
1946 int ieee80211_iface_init(void)
1947 {
1948 return register_netdevice_notifier(&mac80211_netdev_notifier);
1949 }
1950
1951 void ieee80211_iface_exit(void)
1952 {
1953 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1954 }
Linux kernel - Deliverables
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