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[mirror_ubuntu-artful-kernel.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 static void ieee80211_iface_work(struct work_struct *work);
47
48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
49 {
50 struct ieee80211_chanctx_conf *chanctx_conf;
51 int power;
52
53 rcu_read_lock();
54 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
55 if (!chanctx_conf) {
56 rcu_read_unlock();
57 return false;
58 }
59
60 power = ieee80211_chandef_max_power(&chanctx_conf->def);
61 rcu_read_unlock();
62
63 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->user_power_level);
65
66 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 power = min(power, sdata->ap_power_level);
68
69 if (power != sdata->vif.bss_conf.txpower) {
70 sdata->vif.bss_conf.txpower = power;
71 ieee80211_hw_config(sdata->local, 0);
72 return true;
73 }
74
75 return false;
76 }
77
78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
79 bool update_bss)
80 {
81 if (__ieee80211_recalc_txpower(sdata) ||
82 (update_bss && ieee80211_sdata_running(sdata)))
83 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
84 }
85
86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
87 {
88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
89 return 0;
90
91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
92 return IEEE80211_CONF_CHANGE_IDLE;
93 }
94
95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
96 {
97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
98 return 0;
99
100 ieee80211_flush_queues(local, NULL, false);
101
102 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103 return IEEE80211_CONF_CHANGE_IDLE;
104 }
105
106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107 bool force_active)
108 {
109 bool working, scanning, active;
110 unsigned int led_trig_start = 0, led_trig_stop = 0;
111
112 lockdep_assert_held(&local->mtx);
113
114 active = force_active ||
115 !list_empty(&local->chanctx_list) ||
116 local->monitors;
117
118 working = !local->ops->remain_on_channel &&
119 !list_empty(&local->roc_list);
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
154 bool check_dup)
155 {
156 struct ieee80211_local *local = sdata->local;
157 struct ieee80211_sub_if_data *iter;
158 u64 new, mask, tmp;
159 u8 *m;
160 int ret = 0;
161
162 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
163 return 0;
164
165 m = addr;
166 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
167 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
168 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
169
170 m = local->hw.wiphy->addr_mask;
171 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174
175 if (!check_dup)
176 return ret;
177
178 mutex_lock(&local->iflist_mtx);
179 list_for_each_entry(iter, &local->interfaces, list) {
180 if (iter == sdata)
181 continue;
182
183 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
184 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
185 continue;
186
187 m = iter->vif.addr;
188 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
189 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
190 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
191
192 if ((new & ~mask) != (tmp & ~mask)) {
193 ret = -EINVAL;
194 break;
195 }
196 }
197 mutex_unlock(&local->iflist_mtx);
198
199 return ret;
200 }
201
202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
203 {
204 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
205 struct sockaddr *sa = addr;
206 bool check_dup = true;
207 int ret;
208
209 if (ieee80211_sdata_running(sdata))
210 return -EBUSY;
211
212 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
213 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
214 check_dup = false;
215
216 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
217 if (ret)
218 return ret;
219
220 ret = eth_mac_addr(dev, sa);
221
222 if (ret == 0)
223 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
224
225 return ret;
226 }
227
228 static inline int identical_mac_addr_allowed(int type1, int type2)
229 {
230 return type1 == NL80211_IFTYPE_MONITOR ||
231 type2 == NL80211_IFTYPE_MONITOR ||
232 type1 == NL80211_IFTYPE_P2P_DEVICE ||
233 type2 == NL80211_IFTYPE_P2P_DEVICE ||
234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
235 (type1 == NL80211_IFTYPE_WDS &&
236 (type2 == NL80211_IFTYPE_WDS ||
237 type2 == NL80211_IFTYPE_AP)) ||
238 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
239 (type1 == NL80211_IFTYPE_AP_VLAN &&
240 (type2 == NL80211_IFTYPE_AP ||
241 type2 == NL80211_IFTYPE_AP_VLAN));
242 }
243
244 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
245 enum nl80211_iftype iftype)
246 {
247 struct ieee80211_local *local = sdata->local;
248 struct ieee80211_sub_if_data *nsdata;
249 int ret;
250
251 ASSERT_RTNL();
252
253 /* we hold the RTNL here so can safely walk the list */
254 list_for_each_entry(nsdata, &local->interfaces, list) {
255 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
256 /*
257 * Only OCB and monitor mode may coexist
258 */
259 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
260 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
261 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
262 nsdata->vif.type == NL80211_IFTYPE_OCB))
263 return -EBUSY;
264
265 /*
266 * Allow only a single IBSS interface to be up at any
267 * time. This is restricted because beacon distribution
268 * cannot work properly if both are in the same IBSS.
269 *
270 * To remove this restriction we'd have to disallow them
271 * from setting the same SSID on different IBSS interfaces
272 * belonging to the same hardware. Then, however, we're
273 * faced with having to adopt two different TSF timers...
274 */
275 if (iftype == NL80211_IFTYPE_ADHOC &&
276 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
277 return -EBUSY;
278 /*
279 * will not add another interface while any channel
280 * switch is active.
281 */
282 if (nsdata->vif.csa_active)
283 return -EBUSY;
284
285 /*
286 * The remaining checks are only performed for interfaces
287 * with the same MAC address.
288 */
289 if (!ether_addr_equal(sdata->vif.addr,
290 nsdata->vif.addr))
291 continue;
292
293 /*
294 * check whether it may have the same address
295 */
296 if (!identical_mac_addr_allowed(iftype,
297 nsdata->vif.type))
298 return -ENOTUNIQ;
299
300 /*
301 * can only add VLANs to enabled APs
302 */
303 if (iftype == NL80211_IFTYPE_AP_VLAN &&
304 nsdata->vif.type == NL80211_IFTYPE_AP)
305 sdata->bss = &nsdata->u.ap;
306 }
307 }
308
309 mutex_lock(&local->chanctx_mtx);
310 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
311 mutex_unlock(&local->chanctx_mtx);
312 return ret;
313 }
314
315 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
316 enum nl80211_iftype iftype)
317 {
318 int n_queues = sdata->local->hw.queues;
319 int i;
320
321 if (iftype == NL80211_IFTYPE_NAN)
322 return 0;
323
324 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
325 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
326 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
327 IEEE80211_INVAL_HW_QUEUE))
328 return -EINVAL;
329 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
330 n_queues))
331 return -EINVAL;
332 }
333 }
334
335 if ((iftype != NL80211_IFTYPE_AP &&
336 iftype != NL80211_IFTYPE_P2P_GO &&
337 iftype != NL80211_IFTYPE_MESH_POINT) ||
338 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
339 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
340 return 0;
341 }
342
343 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
344 return -EINVAL;
345
346 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
347 return -EINVAL;
348
349 return 0;
350 }
351
352 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
353 const int offset)
354 {
355 struct ieee80211_local *local = sdata->local;
356 u32 flags = sdata->u.mntr.flags;
357
358 #define ADJUST(_f, _s) do { \
359 if (flags & MONITOR_FLAG_##_f) \
360 local->fif_##_s += offset; \
361 } while (0)
362
363 ADJUST(FCSFAIL, fcsfail);
364 ADJUST(PLCPFAIL, plcpfail);
365 ADJUST(CONTROL, control);
366 ADJUST(CONTROL, pspoll);
367 ADJUST(OTHER_BSS, other_bss);
368
369 #undef ADJUST
370 }
371
372 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
373 {
374 struct ieee80211_local *local = sdata->local;
375 int i;
376
377 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
378 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
379 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
380 else if (local->hw.queues >= IEEE80211_NUM_ACS)
381 sdata->vif.hw_queue[i] = i;
382 else
383 sdata->vif.hw_queue[i] = 0;
384 }
385 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
386 }
387
388 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
389 {
390 struct ieee80211_sub_if_data *sdata;
391 int ret;
392
393 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
394 return 0;
395
396 ASSERT_RTNL();
397
398 if (local->monitor_sdata)
399 return 0;
400
401 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
402 if (!sdata)
403 return -ENOMEM;
404
405 /* set up data */
406 sdata->local = local;
407 sdata->vif.type = NL80211_IFTYPE_MONITOR;
408 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
409 wiphy_name(local->hw.wiphy));
410 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
411
412 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
413
414 ieee80211_set_default_queues(sdata);
415
416 ret = drv_add_interface(local, sdata);
417 if (WARN_ON(ret)) {
418 /* ok .. stupid driver, it asked for this! */
419 kfree(sdata);
420 return ret;
421 }
422
423 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
424 if (ret) {
425 kfree(sdata);
426 return ret;
427 }
428
429 mutex_lock(&local->iflist_mtx);
430 rcu_assign_pointer(local->monitor_sdata, sdata);
431 mutex_unlock(&local->iflist_mtx);
432
433 mutex_lock(&local->mtx);
434 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
435 IEEE80211_CHANCTX_EXCLUSIVE);
436 mutex_unlock(&local->mtx);
437 if (ret) {
438 mutex_lock(&local->iflist_mtx);
439 RCU_INIT_POINTER(local->monitor_sdata, NULL);
440 mutex_unlock(&local->iflist_mtx);
441 synchronize_net();
442 drv_remove_interface(local, sdata);
443 kfree(sdata);
444 return ret;
445 }
446
447 skb_queue_head_init(&sdata->skb_queue);
448 INIT_WORK(&sdata->work, ieee80211_iface_work);
449
450 return 0;
451 }
452
453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
454 {
455 struct ieee80211_sub_if_data *sdata;
456
457 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
458 return;
459
460 ASSERT_RTNL();
461
462 mutex_lock(&local->iflist_mtx);
463
464 sdata = rcu_dereference_protected(local->monitor_sdata,
465 lockdep_is_held(&local->iflist_mtx));
466 if (!sdata) {
467 mutex_unlock(&local->iflist_mtx);
468 return;
469 }
470
471 RCU_INIT_POINTER(local->monitor_sdata, NULL);
472 mutex_unlock(&local->iflist_mtx);
473
474 synchronize_net();
475
476 mutex_lock(&local->mtx);
477 ieee80211_vif_release_channel(sdata);
478 mutex_unlock(&local->mtx);
479
480 drv_remove_interface(local, sdata);
481
482 kfree(sdata);
483 }
484
485 /*
486 * NOTE: Be very careful when changing this function, it must NOT return
487 * an error on interface type changes that have been pre-checked, so most
488 * checks should be in ieee80211_check_concurrent_iface.
489 */
490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
491 {
492 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
493 struct net_device *dev = wdev->netdev;
494 struct ieee80211_local *local = sdata->local;
495 struct sta_info *sta;
496 u32 changed = 0;
497 int res;
498 u32 hw_reconf_flags = 0;
499
500 switch (sdata->vif.type) {
501 case NL80211_IFTYPE_WDS:
502 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
503 return -ENOLINK;
504 break;
505 case NL80211_IFTYPE_AP_VLAN: {
506 struct ieee80211_sub_if_data *master;
507
508 if (!sdata->bss)
509 return -ENOLINK;
510
511 mutex_lock(&local->mtx);
512 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
513 mutex_unlock(&local->mtx);
514
515 master = container_of(sdata->bss,
516 struct ieee80211_sub_if_data, u.ap);
517 sdata->control_port_protocol =
518 master->control_port_protocol;
519 sdata->control_port_no_encrypt =
520 master->control_port_no_encrypt;
521 sdata->vif.cab_queue = master->vif.cab_queue;
522 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
523 sizeof(sdata->vif.hw_queue));
524 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
525
526 mutex_lock(&local->key_mtx);
527 sdata->crypto_tx_tailroom_needed_cnt +=
528 master->crypto_tx_tailroom_needed_cnt;
529 mutex_unlock(&local->key_mtx);
530
531 break;
532 }
533 case NL80211_IFTYPE_AP:
534 sdata->bss = &sdata->u.ap;
535 break;
536 case NL80211_IFTYPE_MESH_POINT:
537 case NL80211_IFTYPE_STATION:
538 case NL80211_IFTYPE_MONITOR:
539 case NL80211_IFTYPE_ADHOC:
540 case NL80211_IFTYPE_P2P_DEVICE:
541 case NL80211_IFTYPE_OCB:
542 case NL80211_IFTYPE_NAN:
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 sdata->vif.type != NL80211_IFTYPE_NAN)
646 changed |= ieee80211_reset_erp_info(sdata);
647 ieee80211_bss_info_change_notify(sdata, changed);
648
649 switch (sdata->vif.type) {
650 case NL80211_IFTYPE_STATION:
651 case NL80211_IFTYPE_ADHOC:
652 case NL80211_IFTYPE_AP:
653 case NL80211_IFTYPE_MESH_POINT:
654 case NL80211_IFTYPE_OCB:
655 netif_carrier_off(dev);
656 break;
657 case NL80211_IFTYPE_WDS:
658 case NL80211_IFTYPE_P2P_DEVICE:
659 case NL80211_IFTYPE_NAN:
660 break;
661 default:
662 /* not reached */
663 WARN_ON(1);
664 }
665
666 /*
667 * Set default queue parameters so drivers don't
668 * need to initialise the hardware if the hardware
669 * doesn't start up with sane defaults.
670 * Enable QoS for anything but station interfaces.
671 */
672 ieee80211_set_wmm_default(sdata, true,
673 sdata->vif.type != NL80211_IFTYPE_STATION);
674 }
675
676 set_bit(SDATA_STATE_RUNNING, &sdata->state);
677
678 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
679 /* Create STA entry for the WDS peer */
680 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
681 GFP_KERNEL);
682 if (!sta) {
683 res = -ENOMEM;
684 goto err_del_interface;
685 }
686
687 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
688 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
689 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
690
691 res = sta_info_insert(sta);
692 if (res) {
693 /* STA has been freed */
694 goto err_del_interface;
695 }
696
697 rate_control_rate_init(sta);
698 netif_carrier_on(dev);
699 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
700 rcu_assign_pointer(local->p2p_sdata, sdata);
701 }
702
703 /*
704 * set_multicast_list will be invoked by the networking core
705 * which will check whether any increments here were done in
706 * error and sync them down to the hardware as filter flags.
707 */
708 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
709 atomic_inc(&local->iff_allmultis);
710
711 if (coming_up)
712 local->open_count++;
713
714 if (hw_reconf_flags)
715 ieee80211_hw_config(local, hw_reconf_flags);
716
717 ieee80211_recalc_ps(local);
718
719 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
720 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
721 /* XXX: for AP_VLAN, actually track AP queues */
722 netif_tx_start_all_queues(dev);
723 } else if (dev) {
724 unsigned long flags;
725 int n_acs = IEEE80211_NUM_ACS;
726 int ac;
727
728 if (local->hw.queues < IEEE80211_NUM_ACS)
729 n_acs = 1;
730
731 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
732 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
733 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
734 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
735 for (ac = 0; ac < n_acs; ac++) {
736 int ac_queue = sdata->vif.hw_queue[ac];
737
738 if (local->queue_stop_reasons[ac_queue] == 0 &&
739 skb_queue_empty(&local->pending[ac_queue]))
740 netif_start_subqueue(dev, ac);
741 }
742 }
743 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
744 }
745
746 return 0;
747 err_del_interface:
748 drv_remove_interface(local, sdata);
749 err_stop:
750 if (!local->open_count)
751 drv_stop(local);
752 err_del_bss:
753 sdata->bss = NULL;
754 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
755 mutex_lock(&local->mtx);
756 list_del(&sdata->u.vlan.list);
757 mutex_unlock(&local->mtx);
758 }
759 /* might already be clear but that doesn't matter */
760 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
761 return res;
762 }
763
764 static int ieee80211_open(struct net_device *dev)
765 {
766 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
767 int err;
768
769 /* fail early if user set an invalid address */
770 if (!is_valid_ether_addr(dev->dev_addr))
771 return -EADDRNOTAVAIL;
772
773 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
774 if (err)
775 return err;
776
777 return ieee80211_do_open(&sdata->wdev, true);
778 }
779
780 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
781 bool going_down)
782 {
783 struct ieee80211_local *local = sdata->local;
784 struct fq *fq = &local->fq;
785 unsigned long flags;
786 struct sk_buff *skb, *tmp;
787 u32 hw_reconf_flags = 0;
788 int i, flushed;
789 struct ps_data *ps;
790 struct cfg80211_chan_def chandef;
791 bool cancel_scan;
792 struct cfg80211_nan_func *func;
793
794 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
795
796 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
797 if (cancel_scan)
798 ieee80211_scan_cancel(local);
799
800 /*
801 * Stop TX on this interface first.
802 */
803 if (sdata->dev)
804 netif_tx_stop_all_queues(sdata->dev);
805
806 ieee80211_roc_purge(local, sdata);
807
808 switch (sdata->vif.type) {
809 case NL80211_IFTYPE_STATION:
810 ieee80211_mgd_stop(sdata);
811 break;
812 case NL80211_IFTYPE_ADHOC:
813 ieee80211_ibss_stop(sdata);
814 break;
815 case NL80211_IFTYPE_AP:
816 cancel_work_sync(&sdata->u.ap.request_smps_work);
817 break;
818 default:
819 break;
820 }
821
822 /*
823 * Remove all stations associated with this interface.
824 *
825 * This must be done before calling ops->remove_interface()
826 * because otherwise we can later invoke ops->sta_notify()
827 * whenever the STAs are removed, and that invalidates driver
828 * assumptions about always getting a vif pointer that is valid
829 * (because if we remove a STA after ops->remove_interface()
830 * the driver will have removed the vif info already!)
831 *
832 * In WDS mode a station must exist here and be flushed, for
833 * AP_VLANs stations may exist since there's nothing else that
834 * would have removed them, but in other modes there shouldn't
835 * be any stations.
836 */
837 flushed = sta_info_flush(sdata);
838 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
839 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
840 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
841
842 /* don't count this interface for allmulti while it is down */
843 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
844 atomic_dec(&local->iff_allmultis);
845
846 if (sdata->vif.type == NL80211_IFTYPE_AP) {
847 local->fif_pspoll--;
848 local->fif_probe_req--;
849 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
850 local->fif_probe_req--;
851 }
852
853 if (sdata->dev) {
854 netif_addr_lock_bh(sdata->dev);
855 spin_lock_bh(&local->filter_lock);
856 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
857 sdata->dev->addr_len);
858 spin_unlock_bh(&local->filter_lock);
859 netif_addr_unlock_bh(sdata->dev);
860 }
861
862 del_timer_sync(&local->dynamic_ps_timer);
863 cancel_work_sync(&local->dynamic_ps_enable_work);
864
865 cancel_work_sync(&sdata->recalc_smps);
866 sdata_lock(sdata);
867 mutex_lock(&local->mtx);
868 sdata->vif.csa_active = false;
869 if (sdata->vif.type == NL80211_IFTYPE_STATION)
870 sdata->u.mgd.csa_waiting_bcn = false;
871 if (sdata->csa_block_tx) {
872 ieee80211_wake_vif_queues(local, sdata,
873 IEEE80211_QUEUE_STOP_REASON_CSA);
874 sdata->csa_block_tx = false;
875 }
876 mutex_unlock(&local->mtx);
877 sdata_unlock(sdata);
878
879 cancel_work_sync(&sdata->csa_finalize_work);
880
881 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
882
883 if (sdata->wdev.cac_started) {
884 chandef = sdata->vif.bss_conf.chandef;
885 WARN_ON(local->suspended);
886 mutex_lock(&local->mtx);
887 ieee80211_vif_release_channel(sdata);
888 mutex_unlock(&local->mtx);
889 cfg80211_cac_event(sdata->dev, &chandef,
890 NL80211_RADAR_CAC_ABORTED,
891 GFP_KERNEL);
892 }
893
894 /* APs need special treatment */
895 if (sdata->vif.type == NL80211_IFTYPE_AP) {
896 struct ieee80211_sub_if_data *vlan, *tmpsdata;
897
898 /* down all dependent devices, that is VLANs */
899 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
900 u.vlan.list)
901 dev_close(vlan->dev);
902 WARN_ON(!list_empty(&sdata->u.ap.vlans));
903 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
904 /* remove all packets in parent bc_buf pointing to this dev */
905 ps = &sdata->bss->ps;
906
907 spin_lock_irqsave(&ps->bc_buf.lock, flags);
908 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
909 if (skb->dev == sdata->dev) {
910 __skb_unlink(skb, &ps->bc_buf);
911 local->total_ps_buffered--;
912 ieee80211_free_txskb(&local->hw, skb);
913 }
914 }
915 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
916 }
917
918 if (going_down)
919 local->open_count--;
920
921 switch (sdata->vif.type) {
922 case NL80211_IFTYPE_AP_VLAN:
923 mutex_lock(&local->mtx);
924 list_del(&sdata->u.vlan.list);
925 mutex_unlock(&local->mtx);
926 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
927 /* see comment in the default case below */
928 ieee80211_free_keys(sdata, true);
929 /* no need to tell driver */
930 break;
931 case NL80211_IFTYPE_MONITOR:
932 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
933 local->cooked_mntrs--;
934 break;
935 }
936
937 local->monitors--;
938 if (local->monitors == 0) {
939 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
940 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
941 }
942
943 ieee80211_adjust_monitor_flags(sdata, -1);
944 break;
945 case NL80211_IFTYPE_NAN:
946 /* clean all the functions */
947 spin_lock_bh(&sdata->u.nan.func_lock);
948
949 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
950 idr_remove(&sdata->u.nan.function_inst_ids, i);
951 cfg80211_free_nan_func(func);
952 }
953 idr_destroy(&sdata->u.nan.function_inst_ids);
954
955 spin_unlock_bh(&sdata->u.nan.func_lock);
956 break;
957 case NL80211_IFTYPE_P2P_DEVICE:
958 /* relies on synchronize_rcu() below */
959 RCU_INIT_POINTER(local->p2p_sdata, NULL);
960 /* fall through */
961 default:
962 cancel_work_sync(&sdata->work);
963 /*
964 * When we get here, the interface is marked down.
965 * Free the remaining keys, if there are any
966 * (which can happen in AP mode if userspace sets
967 * keys before the interface is operating, and maybe
968 * also in WDS mode)
969 *
970 * Force the key freeing to always synchronize_net()
971 * to wait for the RX path in case it is using this
972 * interface enqueuing frames at this very time on
973 * another CPU.
974 */
975 ieee80211_free_keys(sdata, true);
976 skb_queue_purge(&sdata->skb_queue);
977 }
978
979 sdata->bss = NULL;
980
981 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
982 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
983 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
984 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
985 if (info->control.vif == &sdata->vif) {
986 __skb_unlink(skb, &local->pending[i]);
987 ieee80211_free_txskb(&local->hw, skb);
988 }
989 }
990 }
991 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
992
993 if (sdata->vif.txq) {
994 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
995
996 spin_lock_bh(&fq->lock);
997 ieee80211_txq_purge(local, txqi);
998 spin_unlock_bh(&fq->lock);
999 }
1000
1001 if (local->open_count == 0)
1002 ieee80211_clear_tx_pending(local);
1003
1004 /*
1005 * If the interface goes down while suspended, presumably because
1006 * the device was unplugged and that happens before our resume,
1007 * then the driver is already unconfigured and the remainder of
1008 * this function isn't needed.
1009 * XXX: what about WoWLAN? If the device has software state, e.g.
1010 * memory allocated, it might expect teardown commands from
1011 * mac80211 here?
1012 */
1013 if (local->suspended) {
1014 WARN_ON(local->wowlan);
1015 WARN_ON(rtnl_dereference(local->monitor_sdata));
1016 return;
1017 }
1018
1019 switch (sdata->vif.type) {
1020 case NL80211_IFTYPE_AP_VLAN:
1021 break;
1022 case NL80211_IFTYPE_MONITOR:
1023 if (local->monitors == 0)
1024 ieee80211_del_virtual_monitor(local);
1025
1026 mutex_lock(&local->mtx);
1027 ieee80211_recalc_idle(local);
1028 mutex_unlock(&local->mtx);
1029
1030 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1031 break;
1032
1033 /* fall through */
1034 default:
1035 if (going_down)
1036 drv_remove_interface(local, sdata);
1037 }
1038
1039 ieee80211_recalc_ps(local);
1040
1041 if (cancel_scan)
1042 flush_delayed_work(&local->scan_work);
1043
1044 if (local->open_count == 0) {
1045 ieee80211_stop_device(local);
1046
1047 /* no reconfiguring after stop! */
1048 return;
1049 }
1050
1051 /* do after stop to avoid reconfiguring when we stop anyway */
1052 ieee80211_configure_filter(local);
1053 ieee80211_hw_config(local, hw_reconf_flags);
1054
1055 if (local->monitors == local->open_count)
1056 ieee80211_add_virtual_monitor(local);
1057 }
1058
1059 static int ieee80211_stop(struct net_device *dev)
1060 {
1061 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1062
1063 ieee80211_do_stop(sdata, true);
1064
1065 return 0;
1066 }
1067
1068 static void ieee80211_set_multicast_list(struct net_device *dev)
1069 {
1070 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071 struct ieee80211_local *local = sdata->local;
1072 int allmulti, sdata_allmulti;
1073
1074 allmulti = !!(dev->flags & IFF_ALLMULTI);
1075 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1076
1077 if (allmulti != sdata_allmulti) {
1078 if (dev->flags & IFF_ALLMULTI)
1079 atomic_inc(&local->iff_allmultis);
1080 else
1081 atomic_dec(&local->iff_allmultis);
1082 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1083 }
1084
1085 spin_lock_bh(&local->filter_lock);
1086 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1087 spin_unlock_bh(&local->filter_lock);
1088 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1089 }
1090
1091 /*
1092 * Called when the netdev is removed or, by the code below, before
1093 * the interface type changes.
1094 */
1095 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1096 {
1097 int i;
1098
1099 /* free extra data */
1100 ieee80211_free_keys(sdata, false);
1101
1102 ieee80211_debugfs_remove_netdev(sdata);
1103
1104 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1105 __skb_queue_purge(&sdata->fragments[i].skb_list);
1106 sdata->fragment_next = 0;
1107
1108 if (ieee80211_vif_is_mesh(&sdata->vif))
1109 ieee80211_mesh_teardown_sdata(sdata);
1110 }
1111
1112 static void ieee80211_uninit(struct net_device *dev)
1113 {
1114 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1115 }
1116
1117 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1118 struct sk_buff *skb,
1119 void *accel_priv,
1120 select_queue_fallback_t fallback)
1121 {
1122 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1123 }
1124
1125 static struct rtnl_link_stats64 *
1126 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1127 {
1128 int i;
1129
1130 for_each_possible_cpu(i) {
1131 const struct pcpu_sw_netstats *tstats;
1132 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1133 unsigned int start;
1134
1135 tstats = per_cpu_ptr(dev->tstats, i);
1136
1137 do {
1138 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1139 rx_packets = tstats->rx_packets;
1140 tx_packets = tstats->tx_packets;
1141 rx_bytes = tstats->rx_bytes;
1142 tx_bytes = tstats->tx_bytes;
1143 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1144
1145 stats->rx_packets += rx_packets;
1146 stats->tx_packets += tx_packets;
1147 stats->rx_bytes += rx_bytes;
1148 stats->tx_bytes += tx_bytes;
1149 }
1150
1151 return stats;
1152 }
1153
1154 static const struct net_device_ops ieee80211_dataif_ops = {
1155 .ndo_open = ieee80211_open,
1156 .ndo_stop = ieee80211_stop,
1157 .ndo_uninit = ieee80211_uninit,
1158 .ndo_start_xmit = ieee80211_subif_start_xmit,
1159 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1160 .ndo_set_mac_address = ieee80211_change_mac,
1161 .ndo_select_queue = ieee80211_netdev_select_queue,
1162 .ndo_get_stats64 = ieee80211_get_stats64,
1163 };
1164
1165 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1166 struct sk_buff *skb,
1167 void *accel_priv,
1168 select_queue_fallback_t fallback)
1169 {
1170 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1171 struct ieee80211_local *local = sdata->local;
1172 struct ieee80211_hdr *hdr;
1173 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1174
1175 if (local->hw.queues < IEEE80211_NUM_ACS)
1176 return 0;
1177
1178 if (skb->len < 4 ||
1179 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1180 return 0; /* doesn't matter, frame will be dropped */
1181
1182 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1183
1184 return ieee80211_select_queue_80211(sdata, skb, hdr);
1185 }
1186
1187 static const struct net_device_ops ieee80211_monitorif_ops = {
1188 .ndo_open = ieee80211_open,
1189 .ndo_stop = ieee80211_stop,
1190 .ndo_uninit = ieee80211_uninit,
1191 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1192 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1193 .ndo_set_mac_address = ieee80211_change_mac,
1194 .ndo_select_queue = ieee80211_monitor_select_queue,
1195 .ndo_get_stats64 = ieee80211_get_stats64,
1196 };
1197
1198 static void ieee80211_if_free(struct net_device *dev)
1199 {
1200 free_percpu(dev->tstats);
1201 free_netdev(dev);
1202 }
1203
1204 static void ieee80211_if_setup(struct net_device *dev)
1205 {
1206 ether_setup(dev);
1207 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1208 dev->netdev_ops = &ieee80211_dataif_ops;
1209 dev->destructor = ieee80211_if_free;
1210 }
1211
1212 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1213 {
1214 ieee80211_if_setup(dev);
1215 dev->priv_flags |= IFF_NO_QUEUE;
1216 }
1217
1218 static void ieee80211_iface_work(struct work_struct *work)
1219 {
1220 struct ieee80211_sub_if_data *sdata =
1221 container_of(work, struct ieee80211_sub_if_data, work);
1222 struct ieee80211_local *local = sdata->local;
1223 struct sk_buff *skb;
1224 struct sta_info *sta;
1225 struct ieee80211_ra_tid *ra_tid;
1226 struct ieee80211_rx_agg *rx_agg;
1227
1228 if (!ieee80211_sdata_running(sdata))
1229 return;
1230
1231 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1232 return;
1233
1234 if (!ieee80211_can_run_worker(local))
1235 return;
1236
1237 /* first process frames */
1238 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1239 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1240
1241 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1242 ra_tid = (void *)&skb->cb;
1243 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1244 ra_tid->tid);
1245 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1246 ra_tid = (void *)&skb->cb;
1247 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1248 ra_tid->tid);
1249 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1250 rx_agg = (void *)&skb->cb;
1251 mutex_lock(&local->sta_mtx);
1252 sta = sta_info_get_bss(sdata, rx_agg->addr);
1253 if (sta)
1254 __ieee80211_start_rx_ba_session(sta,
1255 0, 0, 0, 1, rx_agg->tid,
1256 IEEE80211_MAX_AMPDU_BUF,
1257 false, true);
1258 mutex_unlock(&local->sta_mtx);
1259 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1260 rx_agg = (void *)&skb->cb;
1261 mutex_lock(&local->sta_mtx);
1262 sta = sta_info_get_bss(sdata, rx_agg->addr);
1263 if (sta)
1264 __ieee80211_stop_rx_ba_session(sta,
1265 rx_agg->tid,
1266 WLAN_BACK_RECIPIENT, 0,
1267 false);
1268 mutex_unlock(&local->sta_mtx);
1269 } else if (ieee80211_is_action(mgmt->frame_control) &&
1270 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1271 int len = skb->len;
1272
1273 mutex_lock(&local->sta_mtx);
1274 sta = sta_info_get_bss(sdata, mgmt->sa);
1275 if (sta) {
1276 switch (mgmt->u.action.u.addba_req.action_code) {
1277 case WLAN_ACTION_ADDBA_REQ:
1278 ieee80211_process_addba_request(
1279 local, sta, mgmt, len);
1280 break;
1281 case WLAN_ACTION_ADDBA_RESP:
1282 ieee80211_process_addba_resp(local, sta,
1283 mgmt, len);
1284 break;
1285 case WLAN_ACTION_DELBA:
1286 ieee80211_process_delba(sdata, sta,
1287 mgmt, len);
1288 break;
1289 default:
1290 WARN_ON(1);
1291 break;
1292 }
1293 }
1294 mutex_unlock(&local->sta_mtx);
1295 } else if (ieee80211_is_action(mgmt->frame_control) &&
1296 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1297 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1298 case WLAN_VHT_ACTION_GROUPID_MGMT:
1299 ieee80211_process_mu_groups(sdata, mgmt);
1300 break;
1301 default:
1302 WARN_ON(1);
1303 break;
1304 }
1305 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1306 struct ieee80211_hdr *hdr = (void *)mgmt;
1307 /*
1308 * So the frame isn't mgmt, but frame_control
1309 * is at the right place anyway, of course, so
1310 * the if statement is correct.
1311 *
1312 * Warn if we have other data frame types here,
1313 * they must not get here.
1314 */
1315 WARN_ON(hdr->frame_control &
1316 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1317 WARN_ON(!(hdr->seq_ctrl &
1318 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1319 /*
1320 * This was a fragment of a frame, received while
1321 * a block-ack session was active. That cannot be
1322 * right, so terminate the session.
1323 */
1324 mutex_lock(&local->sta_mtx);
1325 sta = sta_info_get_bss(sdata, mgmt->sa);
1326 if (sta) {
1327 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1328 IEEE80211_QOS_CTL_TID_MASK;
1329
1330 __ieee80211_stop_rx_ba_session(
1331 sta, tid, WLAN_BACK_RECIPIENT,
1332 WLAN_REASON_QSTA_REQUIRE_SETUP,
1333 true);
1334 }
1335 mutex_unlock(&local->sta_mtx);
1336 } else switch (sdata->vif.type) {
1337 case NL80211_IFTYPE_STATION:
1338 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1339 break;
1340 case NL80211_IFTYPE_ADHOC:
1341 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1342 break;
1343 case NL80211_IFTYPE_MESH_POINT:
1344 if (!ieee80211_vif_is_mesh(&sdata->vif))
1345 break;
1346 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1347 break;
1348 default:
1349 WARN(1, "frame for unexpected interface type");
1350 break;
1351 }
1352
1353 kfree_skb(skb);
1354 }
1355
1356 /* then other type-dependent work */
1357 switch (sdata->vif.type) {
1358 case NL80211_IFTYPE_STATION:
1359 ieee80211_sta_work(sdata);
1360 break;
1361 case NL80211_IFTYPE_ADHOC:
1362 ieee80211_ibss_work(sdata);
1363 break;
1364 case NL80211_IFTYPE_MESH_POINT:
1365 if (!ieee80211_vif_is_mesh(&sdata->vif))
1366 break;
1367 ieee80211_mesh_work(sdata);
1368 break;
1369 case NL80211_IFTYPE_OCB:
1370 ieee80211_ocb_work(sdata);
1371 break;
1372 default:
1373 break;
1374 }
1375 }
1376
1377 static void ieee80211_recalc_smps_work(struct work_struct *work)
1378 {
1379 struct ieee80211_sub_if_data *sdata =
1380 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1381
1382 ieee80211_recalc_smps(sdata);
1383 }
1384
1385 /*
1386 * Helper function to initialise an interface to a specific type.
1387 */
1388 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1389 enum nl80211_iftype type)
1390 {
1391 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1392 0xff, 0xff, 0xff};
1393
1394 /* clear type-dependent union */
1395 memset(&sdata->u, 0, sizeof(sdata->u));
1396
1397 /* and set some type-dependent values */
1398 sdata->vif.type = type;
1399 sdata->vif.p2p = false;
1400 sdata->wdev.iftype = type;
1401
1402 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1403 sdata->control_port_no_encrypt = false;
1404 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1405 sdata->vif.bss_conf.idle = true;
1406
1407 sdata->noack_map = 0;
1408
1409 /* only monitor/p2p-device differ */
1410 if (sdata->dev) {
1411 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1412 sdata->dev->type = ARPHRD_ETHER;
1413 }
1414
1415 skb_queue_head_init(&sdata->skb_queue);
1416 INIT_WORK(&sdata->work, ieee80211_iface_work);
1417 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1418 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1419 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1420 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1421
1422 switch (type) {
1423 case NL80211_IFTYPE_P2P_GO:
1424 type = NL80211_IFTYPE_AP;
1425 sdata->vif.type = type;
1426 sdata->vif.p2p = true;
1427 /* fall through */
1428 case NL80211_IFTYPE_AP:
1429 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1430 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1431 INIT_WORK(&sdata->u.ap.request_smps_work,
1432 ieee80211_request_smps_ap_work);
1433 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1434 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1435 break;
1436 case NL80211_IFTYPE_P2P_CLIENT:
1437 type = NL80211_IFTYPE_STATION;
1438 sdata->vif.type = type;
1439 sdata->vif.p2p = true;
1440 /* fall through */
1441 case NL80211_IFTYPE_STATION:
1442 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1443 ieee80211_sta_setup_sdata(sdata);
1444 break;
1445 case NL80211_IFTYPE_OCB:
1446 sdata->vif.bss_conf.bssid = bssid_wildcard;
1447 ieee80211_ocb_setup_sdata(sdata);
1448 break;
1449 case NL80211_IFTYPE_ADHOC:
1450 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1451 ieee80211_ibss_setup_sdata(sdata);
1452 break;
1453 case NL80211_IFTYPE_MESH_POINT:
1454 if (ieee80211_vif_is_mesh(&sdata->vif))
1455 ieee80211_mesh_init_sdata(sdata);
1456 break;
1457 case NL80211_IFTYPE_MONITOR:
1458 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1459 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1460 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1461 MONITOR_FLAG_OTHER_BSS;
1462 break;
1463 case NL80211_IFTYPE_WDS:
1464 sdata->vif.bss_conf.bssid = NULL;
1465 break;
1466 case NL80211_IFTYPE_NAN:
1467 idr_init(&sdata->u.nan.function_inst_ids);
1468 spin_lock_init(&sdata->u.nan.func_lock);
1469 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1470 break;
1471 case NL80211_IFTYPE_AP_VLAN:
1472 case NL80211_IFTYPE_P2P_DEVICE:
1473 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1474 break;
1475 case NL80211_IFTYPE_UNSPECIFIED:
1476 case NUM_NL80211_IFTYPES:
1477 BUG();
1478 break;
1479 }
1480
1481 ieee80211_debugfs_add_netdev(sdata);
1482 }
1483
1484 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1485 enum nl80211_iftype type)
1486 {
1487 struct ieee80211_local *local = sdata->local;
1488 int ret, err;
1489 enum nl80211_iftype internal_type = type;
1490 bool p2p = false;
1491
1492 ASSERT_RTNL();
1493
1494 if (!local->ops->change_interface)
1495 return -EBUSY;
1496
1497 switch (sdata->vif.type) {
1498 case NL80211_IFTYPE_AP:
1499 case NL80211_IFTYPE_STATION:
1500 case NL80211_IFTYPE_ADHOC:
1501 case NL80211_IFTYPE_OCB:
1502 /*
1503 * Could maybe also all others here?
1504 * Just not sure how that interacts
1505 * with the RX/config path e.g. for
1506 * mesh.
1507 */
1508 break;
1509 default:
1510 return -EBUSY;
1511 }
1512
1513 switch (type) {
1514 case NL80211_IFTYPE_AP:
1515 case NL80211_IFTYPE_STATION:
1516 case NL80211_IFTYPE_ADHOC:
1517 case NL80211_IFTYPE_OCB:
1518 /*
1519 * Could probably support everything
1520 * but WDS here (WDS do_open can fail
1521 * under memory pressure, which this
1522 * code isn't prepared to handle).
1523 */
1524 break;
1525 case NL80211_IFTYPE_P2P_CLIENT:
1526 p2p = true;
1527 internal_type = NL80211_IFTYPE_STATION;
1528 break;
1529 case NL80211_IFTYPE_P2P_GO:
1530 p2p = true;
1531 internal_type = NL80211_IFTYPE_AP;
1532 break;
1533 default:
1534 return -EBUSY;
1535 }
1536
1537 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1538 if (ret)
1539 return ret;
1540
1541 ieee80211_do_stop(sdata, false);
1542
1543 ieee80211_teardown_sdata(sdata);
1544
1545 ret = drv_change_interface(local, sdata, internal_type, p2p);
1546 if (ret)
1547 type = ieee80211_vif_type_p2p(&sdata->vif);
1548
1549 /*
1550 * Ignore return value here, there's not much we can do since
1551 * the driver changed the interface type internally already.
1552 * The warnings will hopefully make driver authors fix it :-)
1553 */
1554 ieee80211_check_queues(sdata, type);
1555
1556 ieee80211_setup_sdata(sdata, type);
1557
1558 err = ieee80211_do_open(&sdata->wdev, false);
1559 WARN(err, "type change: do_open returned %d", err);
1560
1561 return ret;
1562 }
1563
1564 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1565 enum nl80211_iftype type)
1566 {
1567 int ret;
1568
1569 ASSERT_RTNL();
1570
1571 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1572 return 0;
1573
1574 if (ieee80211_sdata_running(sdata)) {
1575 ret = ieee80211_runtime_change_iftype(sdata, type);
1576 if (ret)
1577 return ret;
1578 } else {
1579 /* Purge and reset type-dependent state. */
1580 ieee80211_teardown_sdata(sdata);
1581 ieee80211_setup_sdata(sdata, type);
1582 }
1583
1584 /* reset some values that shouldn't be kept across type changes */
1585 if (type == NL80211_IFTYPE_STATION)
1586 sdata->u.mgd.use_4addr = false;
1587
1588 return 0;
1589 }
1590
1591 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1592 u8 *perm_addr, enum nl80211_iftype type)
1593 {
1594 struct ieee80211_sub_if_data *sdata;
1595 u64 mask, start, addr, val, inc;
1596 u8 *m;
1597 u8 tmp_addr[ETH_ALEN];
1598 int i;
1599
1600 /* default ... something at least */
1601 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1602
1603 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1604 local->hw.wiphy->n_addresses <= 1)
1605 return;
1606
1607 mutex_lock(&local->iflist_mtx);
1608
1609 switch (type) {
1610 case NL80211_IFTYPE_MONITOR:
1611 /* doesn't matter */
1612 break;
1613 case NL80211_IFTYPE_WDS:
1614 case NL80211_IFTYPE_AP_VLAN:
1615 /* match up with an AP interface */
1616 list_for_each_entry(sdata, &local->interfaces, list) {
1617 if (sdata->vif.type != NL80211_IFTYPE_AP)
1618 continue;
1619 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1620 break;
1621 }
1622 /* keep default if no AP interface present */
1623 break;
1624 case NL80211_IFTYPE_P2P_CLIENT:
1625 case NL80211_IFTYPE_P2P_GO:
1626 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1627 list_for_each_entry(sdata, &local->interfaces, list) {
1628 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1629 continue;
1630 if (!ieee80211_sdata_running(sdata))
1631 continue;
1632 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1633 goto out_unlock;
1634 }
1635 }
1636 /* otherwise fall through */
1637 default:
1638 /* assign a new address if possible -- try n_addresses first */
1639 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1640 bool used = false;
1641
1642 list_for_each_entry(sdata, &local->interfaces, list) {
1643 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1644 sdata->vif.addr)) {
1645 used = true;
1646 break;
1647 }
1648 }
1649
1650 if (!used) {
1651 memcpy(perm_addr,
1652 local->hw.wiphy->addresses[i].addr,
1653 ETH_ALEN);
1654 break;
1655 }
1656 }
1657
1658 /* try mask if available */
1659 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1660 break;
1661
1662 m = local->hw.wiphy->addr_mask;
1663 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1664 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1665 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1666
1667 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1668 /* not a contiguous mask ... not handled now! */
1669 pr_info("not contiguous\n");
1670 break;
1671 }
1672
1673 /*
1674 * Pick address of existing interface in case user changed
1675 * MAC address manually, default to perm_addr.
1676 */
1677 m = local->hw.wiphy->perm_addr;
1678 list_for_each_entry(sdata, &local->interfaces, list) {
1679 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1680 continue;
1681 m = sdata->vif.addr;
1682 break;
1683 }
1684 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1685 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1686 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1687
1688 inc = 1ULL<<__ffs64(mask);
1689 val = (start & mask);
1690 addr = (start & ~mask) | (val & mask);
1691 do {
1692 bool used = false;
1693
1694 tmp_addr[5] = addr >> 0*8;
1695 tmp_addr[4] = addr >> 1*8;
1696 tmp_addr[3] = addr >> 2*8;
1697 tmp_addr[2] = addr >> 3*8;
1698 tmp_addr[1] = addr >> 4*8;
1699 tmp_addr[0] = addr >> 5*8;
1700
1701 val += inc;
1702
1703 list_for_each_entry(sdata, &local->interfaces, list) {
1704 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1705 used = true;
1706 break;
1707 }
1708 }
1709
1710 if (!used) {
1711 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1712 break;
1713 }
1714 addr = (start & ~mask) | (val & mask);
1715 } while (addr != start);
1716
1717 break;
1718 }
1719
1720 out_unlock:
1721 mutex_unlock(&local->iflist_mtx);
1722 }
1723
1724 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1725 unsigned char name_assign_type,
1726 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1727 struct vif_params *params)
1728 {
1729 struct net_device *ndev = NULL;
1730 struct ieee80211_sub_if_data *sdata = NULL;
1731 struct txq_info *txqi;
1732 void (*if_setup)(struct net_device *dev);
1733 int ret, i;
1734 int txqs = 1;
1735
1736 ASSERT_RTNL();
1737
1738 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1739 struct wireless_dev *wdev;
1740
1741 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1742 GFP_KERNEL);
1743 if (!sdata)
1744 return -ENOMEM;
1745 wdev = &sdata->wdev;
1746
1747 sdata->dev = NULL;
1748 strlcpy(sdata->name, name, IFNAMSIZ);
1749 ieee80211_assign_perm_addr(local, wdev->address, type);
1750 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1751 } else {
1752 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1753 sizeof(void *));
1754 int txq_size = 0;
1755
1756 if (local->ops->wake_tx_queue)
1757 txq_size += sizeof(struct txq_info) +
1758 local->hw.txq_data_size;
1759
1760 if (local->ops->wake_tx_queue)
1761 if_setup = ieee80211_if_setup_no_queue;
1762 else
1763 if_setup = ieee80211_if_setup;
1764
1765 if (local->hw.queues >= IEEE80211_NUM_ACS)
1766 txqs = IEEE80211_NUM_ACS;
1767
1768 ndev = alloc_netdev_mqs(size + txq_size,
1769 name, name_assign_type,
1770 if_setup, txqs, 1);
1771 if (!ndev)
1772 return -ENOMEM;
1773 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1774
1775 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1776 if (!ndev->tstats) {
1777 free_netdev(ndev);
1778 return -ENOMEM;
1779 }
1780
1781 ndev->needed_headroom = local->tx_headroom +
1782 4*6 /* four MAC addresses */
1783 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1784 + 6 /* mesh */
1785 + 8 /* rfc1042/bridge tunnel */
1786 - ETH_HLEN /* ethernet hard_header_len */
1787 + IEEE80211_ENCRYPT_HEADROOM;
1788 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1789
1790 ret = dev_alloc_name(ndev, ndev->name);
1791 if (ret < 0) {
1792 ieee80211_if_free(ndev);
1793 return ret;
1794 }
1795
1796 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1797 if (params && is_valid_ether_addr(params->macaddr))
1798 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1799 else
1800 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1801 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1802
1803 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1804 sdata = netdev_priv(ndev);
1805 ndev->ieee80211_ptr = &sdata->wdev;
1806 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1807 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1808
1809 if (txq_size) {
1810 txqi = netdev_priv(ndev) + size;
1811 ieee80211_txq_init(sdata, NULL, txqi, 0);
1812 }
1813
1814 sdata->dev = ndev;
1815 }
1816
1817 /* initialise type-independent data */
1818 sdata->wdev.wiphy = local->hw.wiphy;
1819 sdata->local = local;
1820
1821 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1822 skb_queue_head_init(&sdata->fragments[i].skb_list);
1823
1824 INIT_LIST_HEAD(&sdata->key_list);
1825
1826 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1827 ieee80211_dfs_cac_timer_work);
1828 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1829 ieee80211_delayed_tailroom_dec);
1830
1831 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1832 struct ieee80211_supported_band *sband;
1833 sband = local->hw.wiphy->bands[i];
1834 sdata->rc_rateidx_mask[i] =
1835 sband ? (1 << sband->n_bitrates) - 1 : 0;
1836 if (sband) {
1837 __le16 cap;
1838 u16 *vht_rate_mask;
1839
1840 memcpy(sdata->rc_rateidx_mcs_mask[i],
1841 sband->ht_cap.mcs.rx_mask,
1842 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1843
1844 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1845 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1846 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1847 } else {
1848 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1849 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1850 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1851 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1852 }
1853 }
1854
1855 ieee80211_set_default_queues(sdata);
1856
1857 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1858 sdata->user_power_level = local->user_power_level;
1859
1860 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1861
1862 /* setup type-dependent data */
1863 ieee80211_setup_sdata(sdata, type);
1864
1865 if (ndev) {
1866 if (params) {
1867 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1868 if (type == NL80211_IFTYPE_STATION)
1869 sdata->u.mgd.use_4addr = params->use_4addr;
1870 }
1871
1872 ndev->features |= local->hw.netdev_features;
1873
1874 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1875
1876 /* MTU range: 256 - 2304 */
1877 ndev->min_mtu = 256;
1878 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1879
1880 ret = register_netdevice(ndev);
1881 if (ret) {
1882 ieee80211_if_free(ndev);
1883 return ret;
1884 }
1885 }
1886
1887 mutex_lock(&local->iflist_mtx);
1888 list_add_tail_rcu(&sdata->list, &local->interfaces);
1889 mutex_unlock(&local->iflist_mtx);
1890
1891 if (new_wdev)
1892 *new_wdev = &sdata->wdev;
1893
1894 return 0;
1895 }
1896
1897 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1898 {
1899 ASSERT_RTNL();
1900
1901 mutex_lock(&sdata->local->iflist_mtx);
1902 list_del_rcu(&sdata->list);
1903 mutex_unlock(&sdata->local->iflist_mtx);
1904
1905 synchronize_rcu();
1906
1907 if (sdata->dev) {
1908 unregister_netdevice(sdata->dev);
1909 } else {
1910 cfg80211_unregister_wdev(&sdata->wdev);
1911 ieee80211_teardown_sdata(sdata);
1912 kfree(sdata);
1913 }
1914 }
1915
1916 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1917 {
1918 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1919 return;
1920 ieee80211_do_stop(sdata, true);
1921 }
1922
1923 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1924 {
1925 struct ieee80211_sub_if_data *sdata, *tmp;
1926 LIST_HEAD(unreg_list);
1927 LIST_HEAD(wdev_list);
1928
1929 ASSERT_RTNL();
1930
1931 /* Before destroying the interfaces, make sure they're all stopped so
1932 * that the hardware is stopped. Otherwise, the driver might still be
1933 * iterating the interfaces during the shutdown, e.g. from a worker
1934 * or from RX processing or similar, and if it does so (using atomic
1935 * iteration) while we're manipulating the list, the iteration will
1936 * crash.
1937 *
1938 * After this, the hardware should be stopped and the driver should
1939 * have stopped all of its activities, so that we can do RCU-unaware
1940 * manipulations of the interface list below.
1941 */
1942 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1943
1944 WARN(local->open_count, "%s: open count remains %d\n",
1945 wiphy_name(local->hw.wiphy), local->open_count);
1946
1947 mutex_lock(&local->iflist_mtx);
1948 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1949 list_del(&sdata->list);
1950
1951 if (sdata->dev)
1952 unregister_netdevice_queue(sdata->dev, &unreg_list);
1953 else
1954 list_add(&sdata->list, &wdev_list);
1955 }
1956 mutex_unlock(&local->iflist_mtx);
1957 unregister_netdevice_many(&unreg_list);
1958
1959 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1960 list_del(&sdata->list);
1961 cfg80211_unregister_wdev(&sdata->wdev);
1962 kfree(sdata);
1963 }
1964 }
1965
1966 static int netdev_notify(struct notifier_block *nb,
1967 unsigned long state, void *ptr)
1968 {
1969 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1970 struct ieee80211_sub_if_data *sdata;
1971
1972 if (state != NETDEV_CHANGENAME)
1973 return NOTIFY_DONE;
1974
1975 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1976 return NOTIFY_DONE;
1977
1978 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1979 return NOTIFY_DONE;
1980
1981 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1982 memcpy(sdata->name, dev->name, IFNAMSIZ);
1983 ieee80211_debugfs_rename_netdev(sdata);
1984
1985 return NOTIFY_OK;
1986 }
1987
1988 static struct notifier_block mac80211_netdev_notifier = {
1989 .notifier_call = netdev_notify,
1990 };
1991
1992 int ieee80211_iface_init(void)
1993 {
1994 return register_netdevice_notifier(&mac80211_netdev_notifier);
1995 }
1996
1997 void ieee80211_iface_exit(void)
1998 {
1999 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2000 }
2001
2002 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2003 {
2004 if (sdata->vif.type == NL80211_IFTYPE_AP)
2005 atomic_inc(&sdata->u.ap.num_mcast_sta);
2006 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2007 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2008 }
2009
2010 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2011 {
2012 if (sdata->vif.type == NL80211_IFTYPE_AP)
2013 atomic_dec(&sdata->u.ap.num_mcast_sta);
2014 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2015 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2016 }
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