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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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 spin_lock_bh(&txqi->queue.lock);
981 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
982 txqi->byte_cnt = 0;
983 spin_unlock_bh(&txqi->queue.lock);
984
985 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
986 }
987
988 if (local->open_count == 0)
989 ieee80211_clear_tx_pending(local);
990
991 /*
992 * If the interface goes down while suspended, presumably because
993 * the device was unplugged and that happens before our resume,
994 * then the driver is already unconfigured and the remainder of
995 * this function isn't needed.
996 * XXX: what about WoWLAN? If the device has software state, e.g.
997 * memory allocated, it might expect teardown commands from
998 * mac80211 here?
999 */
1000 if (local->suspended) {
1001 WARN_ON(local->wowlan);
1002 WARN_ON(rtnl_dereference(local->monitor_sdata));
1003 return;
1004 }
1005
1006 switch (sdata->vif.type) {
1007 case NL80211_IFTYPE_AP_VLAN:
1008 break;
1009 case NL80211_IFTYPE_MONITOR:
1010 if (local->monitors == 0)
1011 ieee80211_del_virtual_monitor(local);
1012
1013 mutex_lock(&local->mtx);
1014 ieee80211_recalc_idle(local);
1015 mutex_unlock(&local->mtx);
1016
1017 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1018 break;
1019
1020 /* fall through */
1021 default:
1022 if (going_down)
1023 drv_remove_interface(local, sdata);
1024 }
1025
1026 ieee80211_recalc_ps(local);
1027
1028 if (cancel_scan)
1029 flush_delayed_work(&local->scan_work);
1030
1031 if (local->open_count == 0) {
1032 ieee80211_stop_device(local);
1033
1034 /* no reconfiguring after stop! */
1035 return;
1036 }
1037
1038 /* do after stop to avoid reconfiguring when we stop anyway */
1039 ieee80211_configure_filter(local);
1040 ieee80211_hw_config(local, hw_reconf_flags);
1041
1042 if (local->monitors == local->open_count)
1043 ieee80211_add_virtual_monitor(local);
1044 }
1045
1046 static int ieee80211_stop(struct net_device *dev)
1047 {
1048 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1049
1050 ieee80211_do_stop(sdata, true);
1051
1052 return 0;
1053 }
1054
1055 static void ieee80211_set_multicast_list(struct net_device *dev)
1056 {
1057 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1058 struct ieee80211_local *local = sdata->local;
1059 int allmulti, sdata_allmulti;
1060
1061 allmulti = !!(dev->flags & IFF_ALLMULTI);
1062 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1063
1064 if (allmulti != sdata_allmulti) {
1065 if (dev->flags & IFF_ALLMULTI)
1066 atomic_inc(&local->iff_allmultis);
1067 else
1068 atomic_dec(&local->iff_allmultis);
1069 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1070 }
1071
1072 spin_lock_bh(&local->filter_lock);
1073 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1074 spin_unlock_bh(&local->filter_lock);
1075 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1076 }
1077
1078 /*
1079 * Called when the netdev is removed or, by the code below, before
1080 * the interface type changes.
1081 */
1082 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1083 {
1084 int i;
1085
1086 /* free extra data */
1087 ieee80211_free_keys(sdata, false);
1088
1089 ieee80211_debugfs_remove_netdev(sdata);
1090
1091 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1092 __skb_queue_purge(&sdata->fragments[i].skb_list);
1093 sdata->fragment_next = 0;
1094
1095 if (ieee80211_vif_is_mesh(&sdata->vif))
1096 mesh_rmc_free(sdata);
1097 }
1098
1099 static void ieee80211_uninit(struct net_device *dev)
1100 {
1101 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1102 }
1103
1104 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1105 struct sk_buff *skb,
1106 void *accel_priv,
1107 select_queue_fallback_t fallback)
1108 {
1109 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1110 }
1111
1112 static struct rtnl_link_stats64 *
1113 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1114 {
1115 int i;
1116
1117 for_each_possible_cpu(i) {
1118 const struct pcpu_sw_netstats *tstats;
1119 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1120 unsigned int start;
1121
1122 tstats = per_cpu_ptr(dev->tstats, i);
1123
1124 do {
1125 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1126 rx_packets = tstats->rx_packets;
1127 tx_packets = tstats->tx_packets;
1128 rx_bytes = tstats->rx_bytes;
1129 tx_bytes = tstats->tx_bytes;
1130 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1131
1132 stats->rx_packets += rx_packets;
1133 stats->tx_packets += tx_packets;
1134 stats->rx_bytes += rx_bytes;
1135 stats->tx_bytes += tx_bytes;
1136 }
1137
1138 return stats;
1139 }
1140
1141 static const struct net_device_ops ieee80211_dataif_ops = {
1142 .ndo_open = ieee80211_open,
1143 .ndo_stop = ieee80211_stop,
1144 .ndo_uninit = ieee80211_uninit,
1145 .ndo_start_xmit = ieee80211_subif_start_xmit,
1146 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1147 .ndo_change_mtu = ieee80211_change_mtu,
1148 .ndo_set_mac_address = ieee80211_change_mac,
1149 .ndo_select_queue = ieee80211_netdev_select_queue,
1150 .ndo_get_stats64 = ieee80211_get_stats64,
1151 };
1152
1153 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1154 struct sk_buff *skb,
1155 void *accel_priv,
1156 select_queue_fallback_t fallback)
1157 {
1158 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1159 struct ieee80211_local *local = sdata->local;
1160 struct ieee80211_hdr *hdr;
1161 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1162
1163 if (local->hw.queues < IEEE80211_NUM_ACS)
1164 return 0;
1165
1166 if (skb->len < 4 ||
1167 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1168 return 0; /* doesn't matter, frame will be dropped */
1169
1170 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1171
1172 return ieee80211_select_queue_80211(sdata, skb, hdr);
1173 }
1174
1175 static const struct net_device_ops ieee80211_monitorif_ops = {
1176 .ndo_open = ieee80211_open,
1177 .ndo_stop = ieee80211_stop,
1178 .ndo_uninit = ieee80211_uninit,
1179 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1180 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1181 .ndo_change_mtu = ieee80211_change_mtu,
1182 .ndo_set_mac_address = ieee80211_change_mac,
1183 .ndo_select_queue = ieee80211_monitor_select_queue,
1184 .ndo_get_stats64 = ieee80211_get_stats64,
1185 };
1186
1187 static void ieee80211_if_free(struct net_device *dev)
1188 {
1189 free_percpu(dev->tstats);
1190 free_netdev(dev);
1191 }
1192
1193 static void ieee80211_if_setup(struct net_device *dev)
1194 {
1195 ether_setup(dev);
1196 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1197 dev->netdev_ops = &ieee80211_dataif_ops;
1198 dev->destructor = ieee80211_if_free;
1199 }
1200
1201 static void ieee80211_iface_work(struct work_struct *work)
1202 {
1203 struct ieee80211_sub_if_data *sdata =
1204 container_of(work, struct ieee80211_sub_if_data, work);
1205 struct ieee80211_local *local = sdata->local;
1206 struct sk_buff *skb;
1207 struct sta_info *sta;
1208 struct ieee80211_ra_tid *ra_tid;
1209 struct ieee80211_rx_agg *rx_agg;
1210
1211 if (!ieee80211_sdata_running(sdata))
1212 return;
1213
1214 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1215 return;
1216
1217 if (!ieee80211_can_run_worker(local))
1218 return;
1219
1220 /* first process frames */
1221 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1222 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1223
1224 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1225 ra_tid = (void *)&skb->cb;
1226 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1227 ra_tid->tid);
1228 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1229 ra_tid = (void *)&skb->cb;
1230 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1231 ra_tid->tid);
1232 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1233 rx_agg = (void *)&skb->cb;
1234 mutex_lock(&local->sta_mtx);
1235 sta = sta_info_get_bss(sdata, rx_agg->addr);
1236 if (sta)
1237 __ieee80211_start_rx_ba_session(sta,
1238 0, 0, 0, 1, rx_agg->tid,
1239 IEEE80211_MAX_AMPDU_BUF,
1240 false, true);
1241 mutex_unlock(&local->sta_mtx);
1242 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1243 rx_agg = (void *)&skb->cb;
1244 mutex_lock(&local->sta_mtx);
1245 sta = sta_info_get_bss(sdata, rx_agg->addr);
1246 if (sta)
1247 __ieee80211_stop_rx_ba_session(sta,
1248 rx_agg->tid,
1249 WLAN_BACK_RECIPIENT, 0,
1250 false);
1251 mutex_unlock(&local->sta_mtx);
1252 } else if (ieee80211_is_action(mgmt->frame_control) &&
1253 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1254 int len = skb->len;
1255
1256 mutex_lock(&local->sta_mtx);
1257 sta = sta_info_get_bss(sdata, mgmt->sa);
1258 if (sta) {
1259 switch (mgmt->u.action.u.addba_req.action_code) {
1260 case WLAN_ACTION_ADDBA_REQ:
1261 ieee80211_process_addba_request(
1262 local, sta, mgmt, len);
1263 break;
1264 case WLAN_ACTION_ADDBA_RESP:
1265 ieee80211_process_addba_resp(local, sta,
1266 mgmt, len);
1267 break;
1268 case WLAN_ACTION_DELBA:
1269 ieee80211_process_delba(sdata, sta,
1270 mgmt, len);
1271 break;
1272 default:
1273 WARN_ON(1);
1274 break;
1275 }
1276 }
1277 mutex_unlock(&local->sta_mtx);
1278 } else if (ieee80211_is_action(mgmt->frame_control) &&
1279 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1280 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1281 case WLAN_VHT_ACTION_GROUPID_MGMT:
1282 ieee80211_process_mu_groups(sdata, mgmt);
1283 break;
1284 default:
1285 WARN_ON(1);
1286 break;
1287 }
1288 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1289 struct ieee80211_hdr *hdr = (void *)mgmt;
1290 /*
1291 * So the frame isn't mgmt, but frame_control
1292 * is at the right place anyway, of course, so
1293 * the if statement is correct.
1294 *
1295 * Warn if we have other data frame types here,
1296 * they must not get here.
1297 */
1298 WARN_ON(hdr->frame_control &
1299 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1300 WARN_ON(!(hdr->seq_ctrl &
1301 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1302 /*
1303 * This was a fragment of a frame, received while
1304 * a block-ack session was active. That cannot be
1305 * right, so terminate the session.
1306 */
1307 mutex_lock(&local->sta_mtx);
1308 sta = sta_info_get_bss(sdata, mgmt->sa);
1309 if (sta) {
1310 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1311 IEEE80211_QOS_CTL_TID_MASK;
1312
1313 __ieee80211_stop_rx_ba_session(
1314 sta, tid, WLAN_BACK_RECIPIENT,
1315 WLAN_REASON_QSTA_REQUIRE_SETUP,
1316 true);
1317 }
1318 mutex_unlock(&local->sta_mtx);
1319 } else switch (sdata->vif.type) {
1320 case NL80211_IFTYPE_STATION:
1321 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1322 break;
1323 case NL80211_IFTYPE_ADHOC:
1324 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1325 break;
1326 case NL80211_IFTYPE_MESH_POINT:
1327 if (!ieee80211_vif_is_mesh(&sdata->vif))
1328 break;
1329 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1330 break;
1331 default:
1332 WARN(1, "frame for unexpected interface type");
1333 break;
1334 }
1335
1336 kfree_skb(skb);
1337 }
1338
1339 /* then other type-dependent work */
1340 switch (sdata->vif.type) {
1341 case NL80211_IFTYPE_STATION:
1342 ieee80211_sta_work(sdata);
1343 break;
1344 case NL80211_IFTYPE_ADHOC:
1345 ieee80211_ibss_work(sdata);
1346 break;
1347 case NL80211_IFTYPE_MESH_POINT:
1348 if (!ieee80211_vif_is_mesh(&sdata->vif))
1349 break;
1350 ieee80211_mesh_work(sdata);
1351 break;
1352 case NL80211_IFTYPE_OCB:
1353 ieee80211_ocb_work(sdata);
1354 break;
1355 default:
1356 break;
1357 }
1358 }
1359
1360 static void ieee80211_recalc_smps_work(struct work_struct *work)
1361 {
1362 struct ieee80211_sub_if_data *sdata =
1363 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1364
1365 ieee80211_recalc_smps(sdata);
1366 }
1367
1368 /*
1369 * Helper function to initialise an interface to a specific type.
1370 */
1371 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1372 enum nl80211_iftype type)
1373 {
1374 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1375 0xff, 0xff, 0xff};
1376
1377 /* clear type-dependent union */
1378 memset(&sdata->u, 0, sizeof(sdata->u));
1379
1380 /* and set some type-dependent values */
1381 sdata->vif.type = type;
1382 sdata->vif.p2p = false;
1383 sdata->wdev.iftype = type;
1384
1385 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1386 sdata->control_port_no_encrypt = false;
1387 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1388 sdata->vif.bss_conf.idle = true;
1389
1390 sdata->noack_map = 0;
1391
1392 /* only monitor/p2p-device differ */
1393 if (sdata->dev) {
1394 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1395 sdata->dev->type = ARPHRD_ETHER;
1396 }
1397
1398 skb_queue_head_init(&sdata->skb_queue);
1399 INIT_WORK(&sdata->work, ieee80211_iface_work);
1400 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1401 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1402 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1403 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1404
1405 switch (type) {
1406 case NL80211_IFTYPE_P2P_GO:
1407 type = NL80211_IFTYPE_AP;
1408 sdata->vif.type = type;
1409 sdata->vif.p2p = true;
1410 /* fall through */
1411 case NL80211_IFTYPE_AP:
1412 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1413 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1414 INIT_WORK(&sdata->u.ap.request_smps_work,
1415 ieee80211_request_smps_ap_work);
1416 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1417 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1418 break;
1419 case NL80211_IFTYPE_P2P_CLIENT:
1420 type = NL80211_IFTYPE_STATION;
1421 sdata->vif.type = type;
1422 sdata->vif.p2p = true;
1423 /* fall through */
1424 case NL80211_IFTYPE_STATION:
1425 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1426 ieee80211_sta_setup_sdata(sdata);
1427 break;
1428 case NL80211_IFTYPE_OCB:
1429 sdata->vif.bss_conf.bssid = bssid_wildcard;
1430 ieee80211_ocb_setup_sdata(sdata);
1431 break;
1432 case NL80211_IFTYPE_ADHOC:
1433 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1434 ieee80211_ibss_setup_sdata(sdata);
1435 break;
1436 case NL80211_IFTYPE_MESH_POINT:
1437 if (ieee80211_vif_is_mesh(&sdata->vif))
1438 ieee80211_mesh_init_sdata(sdata);
1439 break;
1440 case NL80211_IFTYPE_MONITOR:
1441 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1442 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1443 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1444 MONITOR_FLAG_OTHER_BSS;
1445 break;
1446 case NL80211_IFTYPE_WDS:
1447 sdata->vif.bss_conf.bssid = NULL;
1448 break;
1449 case NL80211_IFTYPE_AP_VLAN:
1450 case NL80211_IFTYPE_P2P_DEVICE:
1451 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1452 break;
1453 case NL80211_IFTYPE_UNSPECIFIED:
1454 case NUM_NL80211_IFTYPES:
1455 BUG();
1456 break;
1457 }
1458
1459 ieee80211_debugfs_add_netdev(sdata);
1460 }
1461
1462 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1463 enum nl80211_iftype type)
1464 {
1465 struct ieee80211_local *local = sdata->local;
1466 int ret, err;
1467 enum nl80211_iftype internal_type = type;
1468 bool p2p = false;
1469
1470 ASSERT_RTNL();
1471
1472 if (!local->ops->change_interface)
1473 return -EBUSY;
1474
1475 switch (sdata->vif.type) {
1476 case NL80211_IFTYPE_AP:
1477 case NL80211_IFTYPE_STATION:
1478 case NL80211_IFTYPE_ADHOC:
1479 case NL80211_IFTYPE_OCB:
1480 /*
1481 * Could maybe also all others here?
1482 * Just not sure how that interacts
1483 * with the RX/config path e.g. for
1484 * mesh.
1485 */
1486 break;
1487 default:
1488 return -EBUSY;
1489 }
1490
1491 switch (type) {
1492 case NL80211_IFTYPE_AP:
1493 case NL80211_IFTYPE_STATION:
1494 case NL80211_IFTYPE_ADHOC:
1495 case NL80211_IFTYPE_OCB:
1496 /*
1497 * Could probably support everything
1498 * but WDS here (WDS do_open can fail
1499 * under memory pressure, which this
1500 * code isn't prepared to handle).
1501 */
1502 break;
1503 case NL80211_IFTYPE_P2P_CLIENT:
1504 p2p = true;
1505 internal_type = NL80211_IFTYPE_STATION;
1506 break;
1507 case NL80211_IFTYPE_P2P_GO:
1508 p2p = true;
1509 internal_type = NL80211_IFTYPE_AP;
1510 break;
1511 default:
1512 return -EBUSY;
1513 }
1514
1515 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1516 if (ret)
1517 return ret;
1518
1519 ieee80211_do_stop(sdata, false);
1520
1521 ieee80211_teardown_sdata(sdata);
1522
1523 ret = drv_change_interface(local, sdata, internal_type, p2p);
1524 if (ret)
1525 type = ieee80211_vif_type_p2p(&sdata->vif);
1526
1527 /*
1528 * Ignore return value here, there's not much we can do since
1529 * the driver changed the interface type internally already.
1530 * The warnings will hopefully make driver authors fix it :-)
1531 */
1532 ieee80211_check_queues(sdata, type);
1533
1534 ieee80211_setup_sdata(sdata, type);
1535
1536 err = ieee80211_do_open(&sdata->wdev, false);
1537 WARN(err, "type change: do_open returned %d", err);
1538
1539 return ret;
1540 }
1541
1542 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1543 enum nl80211_iftype type)
1544 {
1545 int ret;
1546
1547 ASSERT_RTNL();
1548
1549 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1550 return 0;
1551
1552 if (ieee80211_sdata_running(sdata)) {
1553 ret = ieee80211_runtime_change_iftype(sdata, type);
1554 if (ret)
1555 return ret;
1556 } else {
1557 /* Purge and reset type-dependent state. */
1558 ieee80211_teardown_sdata(sdata);
1559 ieee80211_setup_sdata(sdata, type);
1560 }
1561
1562 /* reset some values that shouldn't be kept across type changes */
1563 if (type == NL80211_IFTYPE_STATION)
1564 sdata->u.mgd.use_4addr = false;
1565
1566 return 0;
1567 }
1568
1569 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1570 u8 *perm_addr, enum nl80211_iftype type)
1571 {
1572 struct ieee80211_sub_if_data *sdata;
1573 u64 mask, start, addr, val, inc;
1574 u8 *m;
1575 u8 tmp_addr[ETH_ALEN];
1576 int i;
1577
1578 /* default ... something at least */
1579 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1580
1581 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1582 local->hw.wiphy->n_addresses <= 1)
1583 return;
1584
1585 mutex_lock(&local->iflist_mtx);
1586
1587 switch (type) {
1588 case NL80211_IFTYPE_MONITOR:
1589 /* doesn't matter */
1590 break;
1591 case NL80211_IFTYPE_WDS:
1592 case NL80211_IFTYPE_AP_VLAN:
1593 /* match up with an AP interface */
1594 list_for_each_entry(sdata, &local->interfaces, list) {
1595 if (sdata->vif.type != NL80211_IFTYPE_AP)
1596 continue;
1597 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1598 break;
1599 }
1600 /* keep default if no AP interface present */
1601 break;
1602 case NL80211_IFTYPE_P2P_CLIENT:
1603 case NL80211_IFTYPE_P2P_GO:
1604 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1605 list_for_each_entry(sdata, &local->interfaces, list) {
1606 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1607 continue;
1608 if (!ieee80211_sdata_running(sdata))
1609 continue;
1610 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1611 goto out_unlock;
1612 }
1613 }
1614 /* otherwise fall through */
1615 default:
1616 /* assign a new address if possible -- try n_addresses first */
1617 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1618 bool used = false;
1619
1620 list_for_each_entry(sdata, &local->interfaces, list) {
1621 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1622 sdata->vif.addr)) {
1623 used = true;
1624 break;
1625 }
1626 }
1627
1628 if (!used) {
1629 memcpy(perm_addr,
1630 local->hw.wiphy->addresses[i].addr,
1631 ETH_ALEN);
1632 break;
1633 }
1634 }
1635
1636 /* try mask if available */
1637 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1638 break;
1639
1640 m = local->hw.wiphy->addr_mask;
1641 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1642 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1643 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1644
1645 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1646 /* not a contiguous mask ... not handled now! */
1647 pr_info("not contiguous\n");
1648 break;
1649 }
1650
1651 /*
1652 * Pick address of existing interface in case user changed
1653 * MAC address manually, default to perm_addr.
1654 */
1655 m = local->hw.wiphy->perm_addr;
1656 list_for_each_entry(sdata, &local->interfaces, list) {
1657 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1658 continue;
1659 m = sdata->vif.addr;
1660 break;
1661 }
1662 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1663 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1664 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1665
1666 inc = 1ULL<<__ffs64(mask);
1667 val = (start & mask);
1668 addr = (start & ~mask) | (val & mask);
1669 do {
1670 bool used = false;
1671
1672 tmp_addr[5] = addr >> 0*8;
1673 tmp_addr[4] = addr >> 1*8;
1674 tmp_addr[3] = addr >> 2*8;
1675 tmp_addr[2] = addr >> 3*8;
1676 tmp_addr[1] = addr >> 4*8;
1677 tmp_addr[0] = addr >> 5*8;
1678
1679 val += inc;
1680
1681 list_for_each_entry(sdata, &local->interfaces, list) {
1682 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1683 used = true;
1684 break;
1685 }
1686 }
1687
1688 if (!used) {
1689 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1690 break;
1691 }
1692 addr = (start & ~mask) | (val & mask);
1693 } while (addr != start);
1694
1695 break;
1696 }
1697
1698 out_unlock:
1699 mutex_unlock(&local->iflist_mtx);
1700 }
1701
1702 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1703 unsigned char name_assign_type,
1704 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1705 struct vif_params *params)
1706 {
1707 struct net_device *ndev = NULL;
1708 struct ieee80211_sub_if_data *sdata = NULL;
1709 struct txq_info *txqi;
1710 int ret, i;
1711 int txqs = 1;
1712
1713 ASSERT_RTNL();
1714
1715 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1716 struct wireless_dev *wdev;
1717
1718 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1719 GFP_KERNEL);
1720 if (!sdata)
1721 return -ENOMEM;
1722 wdev = &sdata->wdev;
1723
1724 sdata->dev = NULL;
1725 strlcpy(sdata->name, name, IFNAMSIZ);
1726 ieee80211_assign_perm_addr(local, wdev->address, type);
1727 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1728 } else {
1729 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1730 sizeof(void *));
1731 int txq_size = 0;
1732
1733 if (local->ops->wake_tx_queue)
1734 txq_size += sizeof(struct txq_info) +
1735 local->hw.txq_data_size;
1736
1737 if (local->hw.queues >= IEEE80211_NUM_ACS)
1738 txqs = IEEE80211_NUM_ACS;
1739
1740 ndev = alloc_netdev_mqs(size + txq_size,
1741 name, name_assign_type,
1742 ieee80211_if_setup, txqs, 1);
1743 if (!ndev)
1744 return -ENOMEM;
1745 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1746
1747 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1748 if (!ndev->tstats) {
1749 free_netdev(ndev);
1750 return -ENOMEM;
1751 }
1752
1753 ndev->needed_headroom = local->tx_headroom +
1754 4*6 /* four MAC addresses */
1755 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1756 + 6 /* mesh */
1757 + 8 /* rfc1042/bridge tunnel */
1758 - ETH_HLEN /* ethernet hard_header_len */
1759 + IEEE80211_ENCRYPT_HEADROOM;
1760 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1761
1762 ret = dev_alloc_name(ndev, ndev->name);
1763 if (ret < 0) {
1764 ieee80211_if_free(ndev);
1765 return ret;
1766 }
1767
1768 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1769 if (params && is_valid_ether_addr(params->macaddr))
1770 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1771 else
1772 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1773 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1774
1775 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1776 sdata = netdev_priv(ndev);
1777 ndev->ieee80211_ptr = &sdata->wdev;
1778 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1779 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1780
1781 if (txq_size) {
1782 txqi = netdev_priv(ndev) + size;
1783 ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1784 }
1785
1786 sdata->dev = ndev;
1787 }
1788
1789 /* initialise type-independent data */
1790 sdata->wdev.wiphy = local->hw.wiphy;
1791 sdata->local = local;
1792
1793 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1794 skb_queue_head_init(&sdata->fragments[i].skb_list);
1795
1796 INIT_LIST_HEAD(&sdata->key_list);
1797
1798 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1799 ieee80211_dfs_cac_timer_work);
1800 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1801 ieee80211_delayed_tailroom_dec);
1802
1803 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1804 struct ieee80211_supported_band *sband;
1805 sband = local->hw.wiphy->bands[i];
1806 sdata->rc_rateidx_mask[i] =
1807 sband ? (1 << sband->n_bitrates) - 1 : 0;
1808 if (sband) {
1809 __le16 cap;
1810 u16 *vht_rate_mask;
1811
1812 memcpy(sdata->rc_rateidx_mcs_mask[i],
1813 sband->ht_cap.mcs.rx_mask,
1814 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1815
1816 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1817 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1818 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1819 } else {
1820 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1821 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1822 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1823 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1824 }
1825 }
1826
1827 ieee80211_set_default_queues(sdata);
1828
1829 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1830 sdata->user_power_level = local->user_power_level;
1831
1832 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1833
1834 /* setup type-dependent data */
1835 ieee80211_setup_sdata(sdata, type);
1836
1837 if (ndev) {
1838 if (params) {
1839 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1840 if (type == NL80211_IFTYPE_STATION)
1841 sdata->u.mgd.use_4addr = params->use_4addr;
1842 }
1843
1844 ndev->features |= local->hw.netdev_features;
1845
1846 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1847
1848 ret = register_netdevice(ndev);
1849 if (ret) {
1850 ieee80211_if_free(ndev);
1851 return ret;
1852 }
1853 }
1854
1855 mutex_lock(&local->iflist_mtx);
1856 list_add_tail_rcu(&sdata->list, &local->interfaces);
1857 mutex_unlock(&local->iflist_mtx);
1858
1859 if (new_wdev)
1860 *new_wdev = &sdata->wdev;
1861
1862 return 0;
1863 }
1864
1865 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1866 {
1867 ASSERT_RTNL();
1868
1869 mutex_lock(&sdata->local->iflist_mtx);
1870 list_del_rcu(&sdata->list);
1871 mutex_unlock(&sdata->local->iflist_mtx);
1872
1873 synchronize_rcu();
1874
1875 if (sdata->dev) {
1876 unregister_netdevice(sdata->dev);
1877 } else {
1878 cfg80211_unregister_wdev(&sdata->wdev);
1879 ieee80211_teardown_sdata(sdata);
1880 kfree(sdata);
1881 }
1882 }
1883
1884 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1885 {
1886 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1887 return;
1888 ieee80211_do_stop(sdata, true);
1889 }
1890
1891 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1892 {
1893 struct ieee80211_sub_if_data *sdata, *tmp;
1894 LIST_HEAD(unreg_list);
1895 LIST_HEAD(wdev_list);
1896
1897 ASSERT_RTNL();
1898
1899 /* Before destroying the interfaces, make sure they're all stopped so
1900 * that the hardware is stopped. Otherwise, the driver might still be
1901 * iterating the interfaces during the shutdown, e.g. from a worker
1902 * or from RX processing or similar, and if it does so (using atomic
1903 * iteration) while we're manipulating the list, the iteration will
1904 * crash.
1905 *
1906 * After this, the hardware should be stopped and the driver should
1907 * have stopped all of its activities, so that we can do RCU-unaware
1908 * manipulations of the interface list below.
1909 */
1910 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1911
1912 WARN(local->open_count, "%s: open count remains %d\n",
1913 wiphy_name(local->hw.wiphy), local->open_count);
1914
1915 mutex_lock(&local->iflist_mtx);
1916 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1917 list_del(&sdata->list);
1918
1919 if (sdata->dev)
1920 unregister_netdevice_queue(sdata->dev, &unreg_list);
1921 else
1922 list_add(&sdata->list, &wdev_list);
1923 }
1924 mutex_unlock(&local->iflist_mtx);
1925 unregister_netdevice_many(&unreg_list);
1926
1927 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1928 list_del(&sdata->list);
1929 cfg80211_unregister_wdev(&sdata->wdev);
1930 kfree(sdata);
1931 }
1932 }
1933
1934 static int netdev_notify(struct notifier_block *nb,
1935 unsigned long state, void *ptr)
1936 {
1937 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1938 struct ieee80211_sub_if_data *sdata;
1939
1940 if (state != NETDEV_CHANGENAME)
1941 return NOTIFY_DONE;
1942
1943 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1944 return NOTIFY_DONE;
1945
1946 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1947 return NOTIFY_DONE;
1948
1949 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1950 memcpy(sdata->name, dev->name, IFNAMSIZ);
1951 ieee80211_debugfs_rename_netdev(sdata);
1952
1953 return NOTIFY_OK;
1954 }
1955
1956 static struct notifier_block mac80211_netdev_notifier = {
1957 .notifier_call = netdev_notify,
1958 };
1959
1960 int ieee80211_iface_init(void)
1961 {
1962 return register_netdevice_notifier(&mac80211_netdev_notifier);
1963 }
1964
1965 void ieee80211_iface_exit(void)
1966 {
1967 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1968 }
Linux kernel - Deliverables
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