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Merge branch 'fix/sun8i' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[mirror_ubuntu-bionic-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 * Copyright (c) 2016 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/if_arp.h>
18 #include <linux/netdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "sta_info.h"
24 #include "debugfs_netdev.h"
25 #include "mesh.h"
26 #include "led.h"
27 #include "driver-ops.h"
28 #include "wme.h"
29 #include "rate.h"
30
31 /**
32 * DOC: Interface list locking
33 *
34 * The interface list in each struct ieee80211_local is protected
35 * three-fold:
36 *
37 * (1) modifications may only be done under the RTNL
38 * (2) modifications and readers are protected against each other by
39 * the iflist_mtx.
40 * (3) modifications are done in an RCU manner so atomic readers
41 * can traverse the list in RCU-safe blocks.
42 *
43 * As a consequence, reads (traversals) of the list can be protected
44 * by either the RTNL, the iflist_mtx or RCU.
45 */
46
47 static void ieee80211_iface_work(struct work_struct *work);
48
49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
50 {
51 struct ieee80211_chanctx_conf *chanctx_conf;
52 int power;
53
54 rcu_read_lock();
55 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
56 if (!chanctx_conf) {
57 rcu_read_unlock();
58 return false;
59 }
60
61 power = ieee80211_chandef_max_power(&chanctx_conf->def);
62 rcu_read_unlock();
63
64 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->user_power_level);
66
67 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
68 power = min(power, sdata->ap_power_level);
69
70 if (power != sdata->vif.bss_conf.txpower) {
71 sdata->vif.bss_conf.txpower = power;
72 ieee80211_hw_config(sdata->local, 0);
73 return true;
74 }
75
76 return false;
77 }
78
79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
80 bool update_bss)
81 {
82 if (__ieee80211_recalc_txpower(sdata) ||
83 (update_bss && ieee80211_sdata_running(sdata)))
84 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
85 }
86
87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
88 {
89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 return 0;
91
92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 return IEEE80211_CONF_CHANGE_IDLE;
94 }
95
96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
97 {
98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 return 0;
100
101 ieee80211_flush_queues(local, NULL, false);
102
103 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 return IEEE80211_CONF_CHANGE_IDLE;
105 }
106
107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 bool force_active)
109 {
110 bool working, scanning, active;
111 unsigned int led_trig_start = 0, led_trig_stop = 0;
112
113 lockdep_assert_held(&local->mtx);
114
115 active = force_active ||
116 !list_empty(&local->chanctx_list) ||
117 local->monitors;
118
119 working = !local->ops->remain_on_channel &&
120 !list_empty(&local->roc_list);
121
122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124
125 if (working || scanning)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129
130 if (active)
131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 else
133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134
135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136
137 if (working || scanning || active)
138 return __ieee80211_idle_off(local);
139 return __ieee80211_idle_on(local);
140 }
141
142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 return __ieee80211_recalc_idle(local, true);
145 }
146
147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149 u32 change = __ieee80211_recalc_idle(local, false);
150 if (change)
151 ieee80211_hw_config(local, change);
152 }
153
154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155 bool check_dup)
156 {
157 struct ieee80211_local *local = sdata->local;
158 struct ieee80211_sub_if_data *iter;
159 u64 new, mask, tmp;
160 u8 *m;
161 int ret = 0;
162
163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164 return 0;
165
166 m = addr;
167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171 m = local->hw.wiphy->addr_mask;
172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175
176 if (!check_dup)
177 return ret;
178
179 mutex_lock(&local->iflist_mtx);
180 list_for_each_entry(iter, &local->interfaces, list) {
181 if (iter == sdata)
182 continue;
183
184 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186 continue;
187
188 m = iter->vif.addr;
189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192
193 if ((new & ~mask) != (tmp & ~mask)) {
194 ret = -EINVAL;
195 break;
196 }
197 }
198 mutex_unlock(&local->iflist_mtx);
199
200 return ret;
201 }
202
203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
204 {
205 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
206 struct sockaddr *sa = addr;
207 bool check_dup = true;
208 int ret;
209
210 if (ieee80211_sdata_running(sdata))
211 return -EBUSY;
212
213 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
214 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
215 check_dup = false;
216
217 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
218 if (ret)
219 return ret;
220
221 ret = eth_mac_addr(dev, sa);
222
223 if (ret == 0)
224 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
225
226 return ret;
227 }
228
229 static inline int identical_mac_addr_allowed(int type1, int type2)
230 {
231 return type1 == NL80211_IFTYPE_MONITOR ||
232 type2 == NL80211_IFTYPE_MONITOR ||
233 type1 == NL80211_IFTYPE_P2P_DEVICE ||
234 type2 == NL80211_IFTYPE_P2P_DEVICE ||
235 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
236 (type1 == NL80211_IFTYPE_WDS &&
237 (type2 == NL80211_IFTYPE_WDS ||
238 type2 == NL80211_IFTYPE_AP)) ||
239 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
240 (type1 == NL80211_IFTYPE_AP_VLAN &&
241 (type2 == NL80211_IFTYPE_AP ||
242 type2 == NL80211_IFTYPE_AP_VLAN));
243 }
244
245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
246 enum nl80211_iftype iftype)
247 {
248 struct ieee80211_local *local = sdata->local;
249 struct ieee80211_sub_if_data *nsdata;
250 int ret;
251
252 ASSERT_RTNL();
253
254 /* we hold the RTNL here so can safely walk the list */
255 list_for_each_entry(nsdata, &local->interfaces, list) {
256 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
257 /*
258 * Only OCB and monitor mode may coexist
259 */
260 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
261 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
262 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
263 nsdata->vif.type == NL80211_IFTYPE_OCB))
264 return -EBUSY;
265
266 /*
267 * Allow only a single IBSS interface to be up at any
268 * time. This is restricted because beacon distribution
269 * cannot work properly if both are in the same IBSS.
270 *
271 * To remove this restriction we'd have to disallow them
272 * from setting the same SSID on different IBSS interfaces
273 * belonging to the same hardware. Then, however, we're
274 * faced with having to adopt two different TSF timers...
275 */
276 if (iftype == NL80211_IFTYPE_ADHOC &&
277 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
278 return -EBUSY;
279 /*
280 * will not add another interface while any channel
281 * switch is active.
282 */
283 if (nsdata->vif.csa_active)
284 return -EBUSY;
285
286 /*
287 * The remaining checks are only performed for interfaces
288 * with the same MAC address.
289 */
290 if (!ether_addr_equal(sdata->vif.addr,
291 nsdata->vif.addr))
292 continue;
293
294 /*
295 * check whether it may have the same address
296 */
297 if (!identical_mac_addr_allowed(iftype,
298 nsdata->vif.type))
299 return -ENOTUNIQ;
300
301 /*
302 * can only add VLANs to enabled APs
303 */
304 if (iftype == NL80211_IFTYPE_AP_VLAN &&
305 nsdata->vif.type == NL80211_IFTYPE_AP)
306 sdata->bss = &nsdata->u.ap;
307 }
308 }
309
310 mutex_lock(&local->chanctx_mtx);
311 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
312 mutex_unlock(&local->chanctx_mtx);
313 return ret;
314 }
315
316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
317 enum nl80211_iftype iftype)
318 {
319 int n_queues = sdata->local->hw.queues;
320 int i;
321
322 if (iftype == NL80211_IFTYPE_NAN)
323 return 0;
324
325 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
326 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
327 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
328 IEEE80211_INVAL_HW_QUEUE))
329 return -EINVAL;
330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
331 n_queues))
332 return -EINVAL;
333 }
334 }
335
336 if ((iftype != NL80211_IFTYPE_AP &&
337 iftype != NL80211_IFTYPE_P2P_GO &&
338 iftype != NL80211_IFTYPE_MESH_POINT) ||
339 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
340 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341 return 0;
342 }
343
344 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
345 return -EINVAL;
346
347 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
348 return -EINVAL;
349
350 return 0;
351 }
352
353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
354 const int offset)
355 {
356 struct ieee80211_local *local = sdata->local;
357 u32 flags = sdata->u.mntr.flags;
358
359 #define ADJUST(_f, _s) do { \
360 if (flags & MONITOR_FLAG_##_f) \
361 local->fif_##_s += offset; \
362 } while (0)
363
364 ADJUST(FCSFAIL, fcsfail);
365 ADJUST(PLCPFAIL, plcpfail);
366 ADJUST(CONTROL, control);
367 ADJUST(CONTROL, pspoll);
368 ADJUST(OTHER_BSS, other_bss);
369
370 #undef ADJUST
371 }
372
373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
374 {
375 struct ieee80211_local *local = sdata->local;
376 int i;
377
378 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
379 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
380 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
381 else if (local->hw.queues >= IEEE80211_NUM_ACS)
382 sdata->vif.hw_queue[i] = i;
383 else
384 sdata->vif.hw_queue[i] = 0;
385 }
386 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
387 }
388
389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
390 {
391 struct ieee80211_sub_if_data *sdata;
392 int ret;
393
394 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
395 return 0;
396
397 ASSERT_RTNL();
398
399 if (local->monitor_sdata)
400 return 0;
401
402 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
403 if (!sdata)
404 return -ENOMEM;
405
406 /* set up data */
407 sdata->local = local;
408 sdata->vif.type = NL80211_IFTYPE_MONITOR;
409 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
410 wiphy_name(local->hw.wiphy));
411 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
412
413 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
414
415 ieee80211_set_default_queues(sdata);
416
417 ret = drv_add_interface(local, sdata);
418 if (WARN_ON(ret)) {
419 /* ok .. stupid driver, it asked for this! */
420 kfree(sdata);
421 return ret;
422 }
423
424 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
425 if (ret) {
426 kfree(sdata);
427 return ret;
428 }
429
430 mutex_lock(&local->iflist_mtx);
431 rcu_assign_pointer(local->monitor_sdata, sdata);
432 mutex_unlock(&local->iflist_mtx);
433
434 mutex_lock(&local->mtx);
435 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
436 IEEE80211_CHANCTX_EXCLUSIVE);
437 mutex_unlock(&local->mtx);
438 if (ret) {
439 mutex_lock(&local->iflist_mtx);
440 RCU_INIT_POINTER(local->monitor_sdata, NULL);
441 mutex_unlock(&local->iflist_mtx);
442 synchronize_net();
443 drv_remove_interface(local, sdata);
444 kfree(sdata);
445 return ret;
446 }
447
448 skb_queue_head_init(&sdata->skb_queue);
449 INIT_WORK(&sdata->work, ieee80211_iface_work);
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 case NL80211_IFTYPE_NAN:
544 /* no special treatment */
545 break;
546 case NL80211_IFTYPE_UNSPECIFIED:
547 case NUM_NL80211_IFTYPES:
548 case NL80211_IFTYPE_P2P_CLIENT:
549 case NL80211_IFTYPE_P2P_GO:
550 /* cannot happen */
551 WARN_ON(1);
552 break;
553 }
554
555 if (local->open_count == 0) {
556 res = drv_start(local);
557 if (res)
558 goto err_del_bss;
559 /* we're brought up, everything changes */
560 hw_reconf_flags = ~0;
561 ieee80211_led_radio(local, true);
562 ieee80211_mod_tpt_led_trig(local,
563 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
564 }
565
566 /*
567 * Copy the hopefully now-present MAC address to
568 * this interface, if it has the special null one.
569 */
570 if (dev && is_zero_ether_addr(dev->dev_addr)) {
571 memcpy(dev->dev_addr,
572 local->hw.wiphy->perm_addr,
573 ETH_ALEN);
574 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
575
576 if (!is_valid_ether_addr(dev->dev_addr)) {
577 res = -EADDRNOTAVAIL;
578 goto err_stop;
579 }
580 }
581
582 switch (sdata->vif.type) {
583 case NL80211_IFTYPE_AP_VLAN:
584 /* no need to tell driver, but set carrier and chanctx */
585 if (rtnl_dereference(sdata->bss->beacon)) {
586 ieee80211_vif_vlan_copy_chanctx(sdata);
587 netif_carrier_on(dev);
588 } else {
589 netif_carrier_off(dev);
590 }
591 break;
592 case NL80211_IFTYPE_MONITOR:
593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
594 local->cooked_mntrs++;
595 break;
596 }
597
598 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
599 res = drv_add_interface(local, sdata);
600 if (res)
601 goto err_stop;
602 } else if (local->monitors == 0 && local->open_count == 0) {
603 res = ieee80211_add_virtual_monitor(local);
604 if (res)
605 goto err_stop;
606 }
607
608 /* must be before the call to ieee80211_configure_filter */
609 local->monitors++;
610 if (local->monitors == 1) {
611 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
612 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
613 }
614
615 ieee80211_adjust_monitor_flags(sdata, 1);
616 ieee80211_configure_filter(local);
617 mutex_lock(&local->mtx);
618 ieee80211_recalc_idle(local);
619 mutex_unlock(&local->mtx);
620
621 netif_carrier_on(dev);
622 break;
623 default:
624 if (coming_up) {
625 ieee80211_del_virtual_monitor(local);
626
627 res = drv_add_interface(local, sdata);
628 if (res)
629 goto err_stop;
630 res = ieee80211_check_queues(sdata,
631 ieee80211_vif_type_p2p(&sdata->vif));
632 if (res)
633 goto err_del_interface;
634 }
635
636 if (sdata->vif.type == NL80211_IFTYPE_AP) {
637 local->fif_pspoll++;
638 local->fif_probe_req++;
639
640 ieee80211_configure_filter(local);
641 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
642 local->fif_probe_req++;
643 }
644
645 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
646 sdata->vif.type != NL80211_IFTYPE_NAN)
647 changed |= ieee80211_reset_erp_info(sdata);
648 ieee80211_bss_info_change_notify(sdata, changed);
649
650 switch (sdata->vif.type) {
651 case NL80211_IFTYPE_STATION:
652 case NL80211_IFTYPE_ADHOC:
653 case NL80211_IFTYPE_AP:
654 case NL80211_IFTYPE_MESH_POINT:
655 case NL80211_IFTYPE_OCB:
656 netif_carrier_off(dev);
657 break;
658 case NL80211_IFTYPE_WDS:
659 case NL80211_IFTYPE_P2P_DEVICE:
660 case NL80211_IFTYPE_NAN:
661 break;
662 default:
663 /* not reached */
664 WARN_ON(1);
665 }
666
667 /*
668 * Set default queue parameters so drivers don't
669 * need to initialise the hardware if the hardware
670 * doesn't start up with sane defaults.
671 * Enable QoS for anything but station interfaces.
672 */
673 ieee80211_set_wmm_default(sdata, true,
674 sdata->vif.type != NL80211_IFTYPE_STATION);
675 }
676
677 set_bit(SDATA_STATE_RUNNING, &sdata->state);
678
679 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
680 /* Create STA entry for the WDS peer */
681 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
682 GFP_KERNEL);
683 if (!sta) {
684 res = -ENOMEM;
685 goto err_del_interface;
686 }
687
688 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
689 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
690 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
691
692 res = sta_info_insert(sta);
693 if (res) {
694 /* STA has been freed */
695 goto err_del_interface;
696 }
697
698 rate_control_rate_init(sta);
699 netif_carrier_on(dev);
700 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
701 rcu_assign_pointer(local->p2p_sdata, sdata);
702 }
703
704 /*
705 * set_multicast_list will be invoked by the networking core
706 * which will check whether any increments here were done in
707 * error and sync them down to the hardware as filter flags.
708 */
709 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
710 atomic_inc(&local->iff_allmultis);
711
712 if (coming_up)
713 local->open_count++;
714
715 if (hw_reconf_flags)
716 ieee80211_hw_config(local, hw_reconf_flags);
717
718 ieee80211_recalc_ps(local);
719
720 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
721 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
722 /* XXX: for AP_VLAN, actually track AP queues */
723 netif_tx_start_all_queues(dev);
724 } else if (dev) {
725 unsigned long flags;
726 int n_acs = IEEE80211_NUM_ACS;
727 int ac;
728
729 if (local->hw.queues < IEEE80211_NUM_ACS)
730 n_acs = 1;
731
732 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
733 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
734 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
735 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
736 for (ac = 0; ac < n_acs; ac++) {
737 int ac_queue = sdata->vif.hw_queue[ac];
738
739 if (local->queue_stop_reasons[ac_queue] == 0 &&
740 skb_queue_empty(&local->pending[ac_queue]))
741 netif_start_subqueue(dev, ac);
742 }
743 }
744 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
745 }
746
747 return 0;
748 err_del_interface:
749 drv_remove_interface(local, sdata);
750 err_stop:
751 if (!local->open_count)
752 drv_stop(local);
753 err_del_bss:
754 sdata->bss = NULL;
755 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
756 mutex_lock(&local->mtx);
757 list_del(&sdata->u.vlan.list);
758 mutex_unlock(&local->mtx);
759 }
760 /* might already be clear but that doesn't matter */
761 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
762 return res;
763 }
764
765 static int ieee80211_open(struct net_device *dev)
766 {
767 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
768 int err;
769
770 /* fail early if user set an invalid address */
771 if (!is_valid_ether_addr(dev->dev_addr))
772 return -EADDRNOTAVAIL;
773
774 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
775 if (err)
776 return err;
777
778 return ieee80211_do_open(&sdata->wdev, true);
779 }
780
781 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
782 bool going_down)
783 {
784 struct ieee80211_local *local = sdata->local;
785 struct fq *fq = &local->fq;
786 unsigned long flags;
787 struct sk_buff *skb, *tmp;
788 u32 hw_reconf_flags = 0;
789 int i, flushed;
790 struct ps_data *ps;
791 struct cfg80211_chan_def chandef;
792 bool cancel_scan;
793 struct cfg80211_nan_func *func;
794
795 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
796
797 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
798 if (cancel_scan)
799 ieee80211_scan_cancel(local);
800
801 /*
802 * Stop TX on this interface first.
803 */
804 if (sdata->dev)
805 netif_tx_stop_all_queues(sdata->dev);
806
807 ieee80211_roc_purge(local, sdata);
808
809 switch (sdata->vif.type) {
810 case NL80211_IFTYPE_STATION:
811 ieee80211_mgd_stop(sdata);
812 break;
813 case NL80211_IFTYPE_ADHOC:
814 ieee80211_ibss_stop(sdata);
815 break;
816 case NL80211_IFTYPE_AP:
817 cancel_work_sync(&sdata->u.ap.request_smps_work);
818 break;
819 default:
820 break;
821 }
822
823 /*
824 * Remove all stations associated with this interface.
825 *
826 * This must be done before calling ops->remove_interface()
827 * because otherwise we can later invoke ops->sta_notify()
828 * whenever the STAs are removed, and that invalidates driver
829 * assumptions about always getting a vif pointer that is valid
830 * (because if we remove a STA after ops->remove_interface()
831 * the driver will have removed the vif info already!)
832 *
833 * In WDS mode a station must exist here and be flushed, for
834 * AP_VLANs stations may exist since there's nothing else that
835 * would have removed them, but in other modes there shouldn't
836 * be any stations.
837 */
838 flushed = sta_info_flush(sdata);
839 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
840 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
841 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
842
843 /* don't count this interface for allmulti while it is down */
844 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
845 atomic_dec(&local->iff_allmultis);
846
847 if (sdata->vif.type == NL80211_IFTYPE_AP) {
848 local->fif_pspoll--;
849 local->fif_probe_req--;
850 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
851 local->fif_probe_req--;
852 }
853
854 if (sdata->dev) {
855 netif_addr_lock_bh(sdata->dev);
856 spin_lock_bh(&local->filter_lock);
857 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
858 sdata->dev->addr_len);
859 spin_unlock_bh(&local->filter_lock);
860 netif_addr_unlock_bh(sdata->dev);
861 }
862
863 del_timer_sync(&local->dynamic_ps_timer);
864 cancel_work_sync(&local->dynamic_ps_enable_work);
865
866 cancel_work_sync(&sdata->recalc_smps);
867 sdata_lock(sdata);
868 mutex_lock(&local->mtx);
869 sdata->vif.csa_active = false;
870 if (sdata->vif.type == NL80211_IFTYPE_STATION)
871 sdata->u.mgd.csa_waiting_bcn = false;
872 if (sdata->csa_block_tx) {
873 ieee80211_wake_vif_queues(local, sdata,
874 IEEE80211_QUEUE_STOP_REASON_CSA);
875 sdata->csa_block_tx = false;
876 }
877 mutex_unlock(&local->mtx);
878 sdata_unlock(sdata);
879
880 cancel_work_sync(&sdata->csa_finalize_work);
881
882 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
883
884 if (sdata->wdev.cac_started) {
885 chandef = sdata->vif.bss_conf.chandef;
886 WARN_ON(local->suspended);
887 mutex_lock(&local->mtx);
888 ieee80211_vif_release_channel(sdata);
889 mutex_unlock(&local->mtx);
890 cfg80211_cac_event(sdata->dev, &chandef,
891 NL80211_RADAR_CAC_ABORTED,
892 GFP_KERNEL);
893 }
894
895 /* APs need special treatment */
896 if (sdata->vif.type == NL80211_IFTYPE_AP) {
897 struct ieee80211_sub_if_data *vlan, *tmpsdata;
898
899 /* down all dependent devices, that is VLANs */
900 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
901 u.vlan.list)
902 dev_close(vlan->dev);
903 WARN_ON(!list_empty(&sdata->u.ap.vlans));
904 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
905 /* remove all packets in parent bc_buf pointing to this dev */
906 ps = &sdata->bss->ps;
907
908 spin_lock_irqsave(&ps->bc_buf.lock, flags);
909 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
910 if (skb->dev == sdata->dev) {
911 __skb_unlink(skb, &ps->bc_buf);
912 local->total_ps_buffered--;
913 ieee80211_free_txskb(&local->hw, skb);
914 }
915 }
916 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
917 }
918
919 if (going_down)
920 local->open_count--;
921
922 switch (sdata->vif.type) {
923 case NL80211_IFTYPE_AP_VLAN:
924 mutex_lock(&local->mtx);
925 list_del(&sdata->u.vlan.list);
926 mutex_unlock(&local->mtx);
927 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
928 /* see comment in the default case below */
929 ieee80211_free_keys(sdata, true);
930 /* no need to tell driver */
931 break;
932 case NL80211_IFTYPE_MONITOR:
933 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
934 local->cooked_mntrs--;
935 break;
936 }
937
938 local->monitors--;
939 if (local->monitors == 0) {
940 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
941 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
942 }
943
944 ieee80211_adjust_monitor_flags(sdata, -1);
945 break;
946 case NL80211_IFTYPE_NAN:
947 /* clean all the functions */
948 spin_lock_bh(&sdata->u.nan.func_lock);
949
950 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
951 idr_remove(&sdata->u.nan.function_inst_ids, i);
952 cfg80211_free_nan_func(func);
953 }
954 idr_destroy(&sdata->u.nan.function_inst_ids);
955
956 spin_unlock_bh(&sdata->u.nan.func_lock);
957 break;
958 case NL80211_IFTYPE_P2P_DEVICE:
959 /* relies on synchronize_rcu() below */
960 RCU_INIT_POINTER(local->p2p_sdata, NULL);
961 /* fall through */
962 default:
963 cancel_work_sync(&sdata->work);
964 /*
965 * When we get here, the interface is marked down.
966 * Free the remaining keys, if there are any
967 * (which can happen in AP mode if userspace sets
968 * keys before the interface is operating, and maybe
969 * also in WDS mode)
970 *
971 * Force the key freeing to always synchronize_net()
972 * to wait for the RX path in case it is using this
973 * interface enqueuing frames at this very time on
974 * another CPU.
975 */
976 ieee80211_free_keys(sdata, true);
977 skb_queue_purge(&sdata->skb_queue);
978 }
979
980 sdata->bss = NULL;
981
982 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
983 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
984 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
985 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
986 if (info->control.vif == &sdata->vif) {
987 __skb_unlink(skb, &local->pending[i]);
988 ieee80211_free_txskb(&local->hw, skb);
989 }
990 }
991 }
992 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
993
994 if (sdata->vif.txq) {
995 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
996
997 spin_lock_bh(&fq->lock);
998 ieee80211_txq_purge(local, txqi);
999 spin_unlock_bh(&fq->lock);
1000 }
1001
1002 if (local->open_count == 0)
1003 ieee80211_clear_tx_pending(local);
1004
1005 /*
1006 * If the interface goes down while suspended, presumably because
1007 * the device was unplugged and that happens before our resume,
1008 * then the driver is already unconfigured and the remainder of
1009 * this function isn't needed.
1010 * XXX: what about WoWLAN? If the device has software state, e.g.
1011 * memory allocated, it might expect teardown commands from
1012 * mac80211 here?
1013 */
1014 if (local->suspended) {
1015 WARN_ON(local->wowlan);
1016 WARN_ON(rtnl_dereference(local->monitor_sdata));
1017 return;
1018 }
1019
1020 switch (sdata->vif.type) {
1021 case NL80211_IFTYPE_AP_VLAN:
1022 break;
1023 case NL80211_IFTYPE_MONITOR:
1024 if (local->monitors == 0)
1025 ieee80211_del_virtual_monitor(local);
1026
1027 mutex_lock(&local->mtx);
1028 ieee80211_recalc_idle(local);
1029 mutex_unlock(&local->mtx);
1030
1031 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1032 break;
1033
1034 /* fall through */
1035 default:
1036 if (going_down)
1037 drv_remove_interface(local, sdata);
1038 }
1039
1040 ieee80211_recalc_ps(local);
1041
1042 if (cancel_scan)
1043 flush_delayed_work(&local->scan_work);
1044
1045 if (local->open_count == 0) {
1046 ieee80211_stop_device(local);
1047
1048 /* no reconfiguring after stop! */
1049 return;
1050 }
1051
1052 /* do after stop to avoid reconfiguring when we stop anyway */
1053 ieee80211_configure_filter(local);
1054 ieee80211_hw_config(local, hw_reconf_flags);
1055
1056 if (local->monitors == local->open_count)
1057 ieee80211_add_virtual_monitor(local);
1058 }
1059
1060 static int ieee80211_stop(struct net_device *dev)
1061 {
1062 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1063
1064 ieee80211_do_stop(sdata, true);
1065
1066 return 0;
1067 }
1068
1069 static void ieee80211_set_multicast_list(struct net_device *dev)
1070 {
1071 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1072 struct ieee80211_local *local = sdata->local;
1073 int allmulti, sdata_allmulti;
1074
1075 allmulti = !!(dev->flags & IFF_ALLMULTI);
1076 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1077
1078 if (allmulti != sdata_allmulti) {
1079 if (dev->flags & IFF_ALLMULTI)
1080 atomic_inc(&local->iff_allmultis);
1081 else
1082 atomic_dec(&local->iff_allmultis);
1083 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1084 }
1085
1086 spin_lock_bh(&local->filter_lock);
1087 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1088 spin_unlock_bh(&local->filter_lock);
1089 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1090 }
1091
1092 /*
1093 * Called when the netdev is removed or, by the code below, before
1094 * the interface type changes.
1095 */
1096 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1097 {
1098 int i;
1099
1100 /* free extra data */
1101 ieee80211_free_keys(sdata, false);
1102
1103 ieee80211_debugfs_remove_netdev(sdata);
1104
1105 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1106 __skb_queue_purge(&sdata->fragments[i].skb_list);
1107 sdata->fragment_next = 0;
1108
1109 if (ieee80211_vif_is_mesh(&sdata->vif))
1110 ieee80211_mesh_teardown_sdata(sdata);
1111 }
1112
1113 static void ieee80211_uninit(struct net_device *dev)
1114 {
1115 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1116 }
1117
1118 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1119 struct sk_buff *skb,
1120 void *accel_priv,
1121 select_queue_fallback_t fallback)
1122 {
1123 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1124 }
1125
1126 static void
1127 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1128 {
1129 int i;
1130
1131 for_each_possible_cpu(i) {
1132 const struct pcpu_sw_netstats *tstats;
1133 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1134 unsigned int start;
1135
1136 tstats = per_cpu_ptr(dev->tstats, i);
1137
1138 do {
1139 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1140 rx_packets = tstats->rx_packets;
1141 tx_packets = tstats->tx_packets;
1142 rx_bytes = tstats->rx_bytes;
1143 tx_bytes = tstats->tx_bytes;
1144 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1145
1146 stats->rx_packets += rx_packets;
1147 stats->tx_packets += tx_packets;
1148 stats->rx_bytes += rx_bytes;
1149 stats->tx_bytes += tx_bytes;
1150 }
1151 }
1152
1153 static const struct net_device_ops ieee80211_dataif_ops = {
1154 .ndo_open = ieee80211_open,
1155 .ndo_stop = ieee80211_stop,
1156 .ndo_uninit = ieee80211_uninit,
1157 .ndo_start_xmit = ieee80211_subif_start_xmit,
1158 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1159 .ndo_set_mac_address = ieee80211_change_mac,
1160 .ndo_select_queue = ieee80211_netdev_select_queue,
1161 .ndo_get_stats64 = ieee80211_get_stats64,
1162 };
1163
1164 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1165 struct sk_buff *skb,
1166 void *accel_priv,
1167 select_queue_fallback_t fallback)
1168 {
1169 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1170 struct ieee80211_local *local = sdata->local;
1171 struct ieee80211_hdr *hdr;
1172 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1173
1174 if (local->hw.queues < IEEE80211_NUM_ACS)
1175 return 0;
1176
1177 if (skb->len < 4 ||
1178 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1179 return 0; /* doesn't matter, frame will be dropped */
1180
1181 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1182
1183 return ieee80211_select_queue_80211(sdata, skb, hdr);
1184 }
1185
1186 static const struct net_device_ops ieee80211_monitorif_ops = {
1187 .ndo_open = ieee80211_open,
1188 .ndo_stop = ieee80211_stop,
1189 .ndo_uninit = ieee80211_uninit,
1190 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1191 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1192 .ndo_set_mac_address = ieee80211_change_mac,
1193 .ndo_select_queue = ieee80211_monitor_select_queue,
1194 .ndo_get_stats64 = ieee80211_get_stats64,
1195 };
1196
1197 static void ieee80211_if_free(struct net_device *dev)
1198 {
1199 free_percpu(dev->tstats);
1200 free_netdev(dev);
1201 }
1202
1203 static void ieee80211_if_setup(struct net_device *dev)
1204 {
1205 ether_setup(dev);
1206 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1207 dev->netdev_ops = &ieee80211_dataif_ops;
1208 dev->destructor = ieee80211_if_free;
1209 }
1210
1211 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1212 {
1213 ieee80211_if_setup(dev);
1214 dev->priv_flags |= IFF_NO_QUEUE;
1215 }
1216
1217 static void ieee80211_iface_work(struct work_struct *work)
1218 {
1219 struct ieee80211_sub_if_data *sdata =
1220 container_of(work, struct ieee80211_sub_if_data, work);
1221 struct ieee80211_local *local = sdata->local;
1222 struct sk_buff *skb;
1223 struct sta_info *sta;
1224 struct ieee80211_ra_tid *ra_tid;
1225 struct ieee80211_rx_agg *rx_agg;
1226
1227 if (!ieee80211_sdata_running(sdata))
1228 return;
1229
1230 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1231 return;
1232
1233 if (!ieee80211_can_run_worker(local))
1234 return;
1235
1236 /* first process frames */
1237 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1238 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1239
1240 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1241 ra_tid = (void *)&skb->cb;
1242 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1243 ra_tid->tid);
1244 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1245 ra_tid = (void *)&skb->cb;
1246 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1247 ra_tid->tid);
1248 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1249 rx_agg = (void *)&skb->cb;
1250 mutex_lock(&local->sta_mtx);
1251 sta = sta_info_get_bss(sdata, rx_agg->addr);
1252 if (sta)
1253 __ieee80211_start_rx_ba_session(sta,
1254 0, 0, 0, 1, rx_agg->tid,
1255 IEEE80211_MAX_AMPDU_BUF,
1256 false, true);
1257 mutex_unlock(&local->sta_mtx);
1258 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1259 rx_agg = (void *)&skb->cb;
1260 mutex_lock(&local->sta_mtx);
1261 sta = sta_info_get_bss(sdata, rx_agg->addr);
1262 if (sta)
1263 __ieee80211_stop_rx_ba_session(sta,
1264 rx_agg->tid,
1265 WLAN_BACK_RECIPIENT, 0,
1266 false);
1267 mutex_unlock(&local->sta_mtx);
1268 } else if (ieee80211_is_action(mgmt->frame_control) &&
1269 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1270 int len = skb->len;
1271
1272 mutex_lock(&local->sta_mtx);
1273 sta = sta_info_get_bss(sdata, mgmt->sa);
1274 if (sta) {
1275 switch (mgmt->u.action.u.addba_req.action_code) {
1276 case WLAN_ACTION_ADDBA_REQ:
1277 ieee80211_process_addba_request(
1278 local, sta, mgmt, len);
1279 break;
1280 case WLAN_ACTION_ADDBA_RESP:
1281 ieee80211_process_addba_resp(local, sta,
1282 mgmt, len);
1283 break;
1284 case WLAN_ACTION_DELBA:
1285 ieee80211_process_delba(sdata, sta,
1286 mgmt, len);
1287 break;
1288 default:
1289 WARN_ON(1);
1290 break;
1291 }
1292 }
1293 mutex_unlock(&local->sta_mtx);
1294 } else if (ieee80211_is_action(mgmt->frame_control) &&
1295 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1296 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1297 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1298 struct ieee80211_rx_status *status;
1299 enum nl80211_band band;
1300 u8 opmode;
1301
1302 status = IEEE80211_SKB_RXCB(skb);
1303 band = status->band;
1304 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1305
1306 mutex_lock(&local->sta_mtx);
1307 sta = sta_info_get_bss(sdata, mgmt->sa);
1308
1309 if (sta)
1310 ieee80211_vht_handle_opmode(sdata, sta,
1311 opmode,
1312 band);
1313
1314 mutex_unlock(&local->sta_mtx);
1315 break;
1316 }
1317 case WLAN_VHT_ACTION_GROUPID_MGMT:
1318 ieee80211_process_mu_groups(sdata, mgmt);
1319 break;
1320 default:
1321 WARN_ON(1);
1322 break;
1323 }
1324 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1325 struct ieee80211_hdr *hdr = (void *)mgmt;
1326 /*
1327 * So the frame isn't mgmt, but frame_control
1328 * is at the right place anyway, of course, so
1329 * the if statement is correct.
1330 *
1331 * Warn if we have other data frame types here,
1332 * they must not get here.
1333 */
1334 WARN_ON(hdr->frame_control &
1335 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1336 WARN_ON(!(hdr->seq_ctrl &
1337 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1338 /*
1339 * This was a fragment of a frame, received while
1340 * a block-ack session was active. That cannot be
1341 * right, so terminate the session.
1342 */
1343 mutex_lock(&local->sta_mtx);
1344 sta = sta_info_get_bss(sdata, mgmt->sa);
1345 if (sta) {
1346 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1347 IEEE80211_QOS_CTL_TID_MASK;
1348
1349 __ieee80211_stop_rx_ba_session(
1350 sta, tid, WLAN_BACK_RECIPIENT,
1351 WLAN_REASON_QSTA_REQUIRE_SETUP,
1352 true);
1353 }
1354 mutex_unlock(&local->sta_mtx);
1355 } else switch (sdata->vif.type) {
1356 case NL80211_IFTYPE_STATION:
1357 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1358 break;
1359 case NL80211_IFTYPE_ADHOC:
1360 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1361 break;
1362 case NL80211_IFTYPE_MESH_POINT:
1363 if (!ieee80211_vif_is_mesh(&sdata->vif))
1364 break;
1365 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1366 break;
1367 default:
1368 WARN(1, "frame for unexpected interface type");
1369 break;
1370 }
1371
1372 kfree_skb(skb);
1373 }
1374
1375 /* then other type-dependent work */
1376 switch (sdata->vif.type) {
1377 case NL80211_IFTYPE_STATION:
1378 ieee80211_sta_work(sdata);
1379 break;
1380 case NL80211_IFTYPE_ADHOC:
1381 ieee80211_ibss_work(sdata);
1382 break;
1383 case NL80211_IFTYPE_MESH_POINT:
1384 if (!ieee80211_vif_is_mesh(&sdata->vif))
1385 break;
1386 ieee80211_mesh_work(sdata);
1387 break;
1388 case NL80211_IFTYPE_OCB:
1389 ieee80211_ocb_work(sdata);
1390 break;
1391 default:
1392 break;
1393 }
1394 }
1395
1396 static void ieee80211_recalc_smps_work(struct work_struct *work)
1397 {
1398 struct ieee80211_sub_if_data *sdata =
1399 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1400
1401 ieee80211_recalc_smps(sdata);
1402 }
1403
1404 /*
1405 * Helper function to initialise an interface to a specific type.
1406 */
1407 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1408 enum nl80211_iftype type)
1409 {
1410 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1411 0xff, 0xff, 0xff};
1412
1413 /* clear type-dependent union */
1414 memset(&sdata->u, 0, sizeof(sdata->u));
1415
1416 /* and set some type-dependent values */
1417 sdata->vif.type = type;
1418 sdata->vif.p2p = false;
1419 sdata->wdev.iftype = type;
1420
1421 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1422 sdata->control_port_no_encrypt = false;
1423 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1424 sdata->vif.bss_conf.idle = true;
1425
1426 sdata->noack_map = 0;
1427
1428 /* only monitor/p2p-device differ */
1429 if (sdata->dev) {
1430 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1431 sdata->dev->type = ARPHRD_ETHER;
1432 }
1433
1434 skb_queue_head_init(&sdata->skb_queue);
1435 INIT_WORK(&sdata->work, ieee80211_iface_work);
1436 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1437 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1438 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1439 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1440
1441 switch (type) {
1442 case NL80211_IFTYPE_P2P_GO:
1443 type = NL80211_IFTYPE_AP;
1444 sdata->vif.type = type;
1445 sdata->vif.p2p = true;
1446 /* fall through */
1447 case NL80211_IFTYPE_AP:
1448 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1449 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1450 INIT_WORK(&sdata->u.ap.request_smps_work,
1451 ieee80211_request_smps_ap_work);
1452 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1453 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1454 break;
1455 case NL80211_IFTYPE_P2P_CLIENT:
1456 type = NL80211_IFTYPE_STATION;
1457 sdata->vif.type = type;
1458 sdata->vif.p2p = true;
1459 /* fall through */
1460 case NL80211_IFTYPE_STATION:
1461 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1462 ieee80211_sta_setup_sdata(sdata);
1463 break;
1464 case NL80211_IFTYPE_OCB:
1465 sdata->vif.bss_conf.bssid = bssid_wildcard;
1466 ieee80211_ocb_setup_sdata(sdata);
1467 break;
1468 case NL80211_IFTYPE_ADHOC:
1469 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1470 ieee80211_ibss_setup_sdata(sdata);
1471 break;
1472 case NL80211_IFTYPE_MESH_POINT:
1473 if (ieee80211_vif_is_mesh(&sdata->vif))
1474 ieee80211_mesh_init_sdata(sdata);
1475 break;
1476 case NL80211_IFTYPE_MONITOR:
1477 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1478 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1479 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1480 MONITOR_FLAG_OTHER_BSS;
1481 break;
1482 case NL80211_IFTYPE_WDS:
1483 sdata->vif.bss_conf.bssid = NULL;
1484 break;
1485 case NL80211_IFTYPE_NAN:
1486 idr_init(&sdata->u.nan.function_inst_ids);
1487 spin_lock_init(&sdata->u.nan.func_lock);
1488 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1489 break;
1490 case NL80211_IFTYPE_AP_VLAN:
1491 case NL80211_IFTYPE_P2P_DEVICE:
1492 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1493 break;
1494 case NL80211_IFTYPE_UNSPECIFIED:
1495 case NUM_NL80211_IFTYPES:
1496 BUG();
1497 break;
1498 }
1499
1500 ieee80211_debugfs_add_netdev(sdata);
1501 }
1502
1503 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1504 enum nl80211_iftype type)
1505 {
1506 struct ieee80211_local *local = sdata->local;
1507 int ret, err;
1508 enum nl80211_iftype internal_type = type;
1509 bool p2p = false;
1510
1511 ASSERT_RTNL();
1512
1513 if (!local->ops->change_interface)
1514 return -EBUSY;
1515
1516 switch (sdata->vif.type) {
1517 case NL80211_IFTYPE_AP:
1518 case NL80211_IFTYPE_STATION:
1519 case NL80211_IFTYPE_ADHOC:
1520 case NL80211_IFTYPE_OCB:
1521 /*
1522 * Could maybe also all others here?
1523 * Just not sure how that interacts
1524 * with the RX/config path e.g. for
1525 * mesh.
1526 */
1527 break;
1528 default:
1529 return -EBUSY;
1530 }
1531
1532 switch (type) {
1533 case NL80211_IFTYPE_AP:
1534 case NL80211_IFTYPE_STATION:
1535 case NL80211_IFTYPE_ADHOC:
1536 case NL80211_IFTYPE_OCB:
1537 /*
1538 * Could probably support everything
1539 * but WDS here (WDS do_open can fail
1540 * under memory pressure, which this
1541 * code isn't prepared to handle).
1542 */
1543 break;
1544 case NL80211_IFTYPE_P2P_CLIENT:
1545 p2p = true;
1546 internal_type = NL80211_IFTYPE_STATION;
1547 break;
1548 case NL80211_IFTYPE_P2P_GO:
1549 p2p = true;
1550 internal_type = NL80211_IFTYPE_AP;
1551 break;
1552 default:
1553 return -EBUSY;
1554 }
1555
1556 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1557 if (ret)
1558 return ret;
1559
1560 ieee80211_do_stop(sdata, false);
1561
1562 ieee80211_teardown_sdata(sdata);
1563
1564 ret = drv_change_interface(local, sdata, internal_type, p2p);
1565 if (ret)
1566 type = ieee80211_vif_type_p2p(&sdata->vif);
1567
1568 /*
1569 * Ignore return value here, there's not much we can do since
1570 * the driver changed the interface type internally already.
1571 * The warnings will hopefully make driver authors fix it :-)
1572 */
1573 ieee80211_check_queues(sdata, type);
1574
1575 ieee80211_setup_sdata(sdata, type);
1576
1577 err = ieee80211_do_open(&sdata->wdev, false);
1578 WARN(err, "type change: do_open returned %d", err);
1579
1580 return ret;
1581 }
1582
1583 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1584 enum nl80211_iftype type)
1585 {
1586 int ret;
1587
1588 ASSERT_RTNL();
1589
1590 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1591 return 0;
1592
1593 if (ieee80211_sdata_running(sdata)) {
1594 ret = ieee80211_runtime_change_iftype(sdata, type);
1595 if (ret)
1596 return ret;
1597 } else {
1598 /* Purge and reset type-dependent state. */
1599 ieee80211_teardown_sdata(sdata);
1600 ieee80211_setup_sdata(sdata, type);
1601 }
1602
1603 /* reset some values that shouldn't be kept across type changes */
1604 if (type == NL80211_IFTYPE_STATION)
1605 sdata->u.mgd.use_4addr = false;
1606
1607 return 0;
1608 }
1609
1610 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1611 u8 *perm_addr, enum nl80211_iftype type)
1612 {
1613 struct ieee80211_sub_if_data *sdata;
1614 u64 mask, start, addr, val, inc;
1615 u8 *m;
1616 u8 tmp_addr[ETH_ALEN];
1617 int i;
1618
1619 /* default ... something at least */
1620 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1621
1622 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1623 local->hw.wiphy->n_addresses <= 1)
1624 return;
1625
1626 mutex_lock(&local->iflist_mtx);
1627
1628 switch (type) {
1629 case NL80211_IFTYPE_MONITOR:
1630 /* doesn't matter */
1631 break;
1632 case NL80211_IFTYPE_WDS:
1633 case NL80211_IFTYPE_AP_VLAN:
1634 /* match up with an AP interface */
1635 list_for_each_entry(sdata, &local->interfaces, list) {
1636 if (sdata->vif.type != NL80211_IFTYPE_AP)
1637 continue;
1638 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1639 break;
1640 }
1641 /* keep default if no AP interface present */
1642 break;
1643 case NL80211_IFTYPE_P2P_CLIENT:
1644 case NL80211_IFTYPE_P2P_GO:
1645 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1646 list_for_each_entry(sdata, &local->interfaces, list) {
1647 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1648 continue;
1649 if (!ieee80211_sdata_running(sdata))
1650 continue;
1651 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1652 goto out_unlock;
1653 }
1654 }
1655 /* otherwise fall through */
1656 default:
1657 /* assign a new address if possible -- try n_addresses first */
1658 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1659 bool used = false;
1660
1661 list_for_each_entry(sdata, &local->interfaces, list) {
1662 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1663 sdata->vif.addr)) {
1664 used = true;
1665 break;
1666 }
1667 }
1668
1669 if (!used) {
1670 memcpy(perm_addr,
1671 local->hw.wiphy->addresses[i].addr,
1672 ETH_ALEN);
1673 break;
1674 }
1675 }
1676
1677 /* try mask if available */
1678 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1679 break;
1680
1681 m = local->hw.wiphy->addr_mask;
1682 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1683 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1684 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1685
1686 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1687 /* not a contiguous mask ... not handled now! */
1688 pr_info("not contiguous\n");
1689 break;
1690 }
1691
1692 /*
1693 * Pick address of existing interface in case user changed
1694 * MAC address manually, default to perm_addr.
1695 */
1696 m = local->hw.wiphy->perm_addr;
1697 list_for_each_entry(sdata, &local->interfaces, list) {
1698 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1699 continue;
1700 m = sdata->vif.addr;
1701 break;
1702 }
1703 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1704 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1705 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1706
1707 inc = 1ULL<<__ffs64(mask);
1708 val = (start & mask);
1709 addr = (start & ~mask) | (val & mask);
1710 do {
1711 bool used = false;
1712
1713 tmp_addr[5] = addr >> 0*8;
1714 tmp_addr[4] = addr >> 1*8;
1715 tmp_addr[3] = addr >> 2*8;
1716 tmp_addr[2] = addr >> 3*8;
1717 tmp_addr[1] = addr >> 4*8;
1718 tmp_addr[0] = addr >> 5*8;
1719
1720 val += inc;
1721
1722 list_for_each_entry(sdata, &local->interfaces, list) {
1723 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1724 used = true;
1725 break;
1726 }
1727 }
1728
1729 if (!used) {
1730 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1731 break;
1732 }
1733 addr = (start & ~mask) | (val & mask);
1734 } while (addr != start);
1735
1736 break;
1737 }
1738
1739 out_unlock:
1740 mutex_unlock(&local->iflist_mtx);
1741 }
1742
1743 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1744 unsigned char name_assign_type,
1745 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1746 struct vif_params *params)
1747 {
1748 struct net_device *ndev = NULL;
1749 struct ieee80211_sub_if_data *sdata = NULL;
1750 struct txq_info *txqi;
1751 void (*if_setup)(struct net_device *dev);
1752 int ret, i;
1753 int txqs = 1;
1754
1755 ASSERT_RTNL();
1756
1757 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1758 struct wireless_dev *wdev;
1759
1760 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1761 GFP_KERNEL);
1762 if (!sdata)
1763 return -ENOMEM;
1764 wdev = &sdata->wdev;
1765
1766 sdata->dev = NULL;
1767 strlcpy(sdata->name, name, IFNAMSIZ);
1768 ieee80211_assign_perm_addr(local, wdev->address, type);
1769 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1770 } else {
1771 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1772 sizeof(void *));
1773 int txq_size = 0;
1774
1775 if (local->ops->wake_tx_queue)
1776 txq_size += sizeof(struct txq_info) +
1777 local->hw.txq_data_size;
1778
1779 if (local->ops->wake_tx_queue)
1780 if_setup = ieee80211_if_setup_no_queue;
1781 else
1782 if_setup = ieee80211_if_setup;
1783
1784 if (local->hw.queues >= IEEE80211_NUM_ACS)
1785 txqs = IEEE80211_NUM_ACS;
1786
1787 ndev = alloc_netdev_mqs(size + txq_size,
1788 name, name_assign_type,
1789 if_setup, txqs, 1);
1790 if (!ndev)
1791 return -ENOMEM;
1792 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1793
1794 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1795 if (!ndev->tstats) {
1796 free_netdev(ndev);
1797 return -ENOMEM;
1798 }
1799
1800 ndev->needed_headroom = local->tx_headroom +
1801 4*6 /* four MAC addresses */
1802 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1803 + 6 /* mesh */
1804 + 8 /* rfc1042/bridge tunnel */
1805 - ETH_HLEN /* ethernet hard_header_len */
1806 + IEEE80211_ENCRYPT_HEADROOM;
1807 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1808
1809 ret = dev_alloc_name(ndev, ndev->name);
1810 if (ret < 0) {
1811 ieee80211_if_free(ndev);
1812 return ret;
1813 }
1814
1815 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1816 if (params && is_valid_ether_addr(params->macaddr))
1817 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1818 else
1819 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1820 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1821
1822 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1823 sdata = netdev_priv(ndev);
1824 ndev->ieee80211_ptr = &sdata->wdev;
1825 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1826 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1827
1828 if (txq_size) {
1829 txqi = netdev_priv(ndev) + size;
1830 ieee80211_txq_init(sdata, NULL, txqi, 0);
1831 }
1832
1833 sdata->dev = ndev;
1834 }
1835
1836 /* initialise type-independent data */
1837 sdata->wdev.wiphy = local->hw.wiphy;
1838 sdata->local = local;
1839
1840 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1841 skb_queue_head_init(&sdata->fragments[i].skb_list);
1842
1843 INIT_LIST_HEAD(&sdata->key_list);
1844
1845 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1846 ieee80211_dfs_cac_timer_work);
1847 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1848 ieee80211_delayed_tailroom_dec);
1849
1850 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1851 struct ieee80211_supported_band *sband;
1852 sband = local->hw.wiphy->bands[i];
1853 sdata->rc_rateidx_mask[i] =
1854 sband ? (1 << sband->n_bitrates) - 1 : 0;
1855 if (sband) {
1856 __le16 cap;
1857 u16 *vht_rate_mask;
1858
1859 memcpy(sdata->rc_rateidx_mcs_mask[i],
1860 sband->ht_cap.mcs.rx_mask,
1861 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1862
1863 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1864 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1865 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1866 } else {
1867 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1868 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1869 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1870 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1871 }
1872 }
1873
1874 ieee80211_set_default_queues(sdata);
1875
1876 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1877 sdata->user_power_level = local->user_power_level;
1878
1879 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1880
1881 /* setup type-dependent data */
1882 ieee80211_setup_sdata(sdata, type);
1883
1884 if (ndev) {
1885 if (params) {
1886 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1887 if (type == NL80211_IFTYPE_STATION)
1888 sdata->u.mgd.use_4addr = params->use_4addr;
1889 }
1890
1891 ndev->features |= local->hw.netdev_features;
1892
1893 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1894
1895 /* MTU range: 256 - 2304 */
1896 ndev->min_mtu = 256;
1897 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1898
1899 ret = register_netdevice(ndev);
1900 if (ret) {
1901 ieee80211_if_free(ndev);
1902 return ret;
1903 }
1904 }
1905
1906 mutex_lock(&local->iflist_mtx);
1907 list_add_tail_rcu(&sdata->list, &local->interfaces);
1908 mutex_unlock(&local->iflist_mtx);
1909
1910 if (new_wdev)
1911 *new_wdev = &sdata->wdev;
1912
1913 return 0;
1914 }
1915
1916 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1917 {
1918 ASSERT_RTNL();
1919
1920 mutex_lock(&sdata->local->iflist_mtx);
1921 list_del_rcu(&sdata->list);
1922 mutex_unlock(&sdata->local->iflist_mtx);
1923
1924 synchronize_rcu();
1925
1926 if (sdata->dev) {
1927 unregister_netdevice(sdata->dev);
1928 } else {
1929 cfg80211_unregister_wdev(&sdata->wdev);
1930 ieee80211_teardown_sdata(sdata);
1931 kfree(sdata);
1932 }
1933 }
1934
1935 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1936 {
1937 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1938 return;
1939 ieee80211_do_stop(sdata, true);
1940 }
1941
1942 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1943 {
1944 struct ieee80211_sub_if_data *sdata, *tmp;
1945 LIST_HEAD(unreg_list);
1946 LIST_HEAD(wdev_list);
1947
1948 ASSERT_RTNL();
1949
1950 /* Before destroying the interfaces, make sure they're all stopped so
1951 * that the hardware is stopped. Otherwise, the driver might still be
1952 * iterating the interfaces during the shutdown, e.g. from a worker
1953 * or from RX processing or similar, and if it does so (using atomic
1954 * iteration) while we're manipulating the list, the iteration will
1955 * crash.
1956 *
1957 * After this, the hardware should be stopped and the driver should
1958 * have stopped all of its activities, so that we can do RCU-unaware
1959 * manipulations of the interface list below.
1960 */
1961 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1962
1963 WARN(local->open_count, "%s: open count remains %d\n",
1964 wiphy_name(local->hw.wiphy), local->open_count);
1965
1966 mutex_lock(&local->iflist_mtx);
1967 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1968 list_del(&sdata->list);
1969
1970 if (sdata->dev)
1971 unregister_netdevice_queue(sdata->dev, &unreg_list);
1972 else
1973 list_add(&sdata->list, &wdev_list);
1974 }
1975 mutex_unlock(&local->iflist_mtx);
1976 unregister_netdevice_many(&unreg_list);
1977
1978 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1979 list_del(&sdata->list);
1980 cfg80211_unregister_wdev(&sdata->wdev);
1981 kfree(sdata);
1982 }
1983 }
1984
1985 static int netdev_notify(struct notifier_block *nb,
1986 unsigned long state, void *ptr)
1987 {
1988 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1989 struct ieee80211_sub_if_data *sdata;
1990
1991 if (state != NETDEV_CHANGENAME)
1992 return NOTIFY_DONE;
1993
1994 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1995 return NOTIFY_DONE;
1996
1997 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1998 return NOTIFY_DONE;
1999
2000 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2001 memcpy(sdata->name, dev->name, IFNAMSIZ);
2002 ieee80211_debugfs_rename_netdev(sdata);
2003
2004 return NOTIFY_OK;
2005 }
2006
2007 static struct notifier_block mac80211_netdev_notifier = {
2008 .notifier_call = netdev_notify,
2009 };
2010
2011 int ieee80211_iface_init(void)
2012 {
2013 return register_netdevice_notifier(&mac80211_netdev_notifier);
2014 }
2015
2016 void ieee80211_iface_exit(void)
2017 {
2018 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2019 }
2020
2021 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2022 {
2023 if (sdata->vif.type == NL80211_IFTYPE_AP)
2024 atomic_inc(&sdata->u.ap.num_mcast_sta);
2025 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2026 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2027 }
2028
2029 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2030 {
2031 if (sdata->vif.type == NL80211_IFTYPE_AP)
2032 atomic_dec(&sdata->u.ap.num_mcast_sta);
2033 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2034 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2035 }
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