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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / mac80211 / iface.c
blob5fe01f82df128807fc3823299a4fec374f2320f4
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 switch (sdata->vif.type) {
680 case NL80211_IFTYPE_WDS:
681 /* Create STA entry for the WDS peer */
682 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
683 GFP_KERNEL);
684 if (!sta) {
685 res = -ENOMEM;
686 goto err_del_interface;
687 }
688
689 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
690 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
691 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
692
693 res = sta_info_insert(sta);
694 if (res) {
695 /* STA has been freed */
696 goto err_del_interface;
697 }
698
699 rate_control_rate_init(sta);
700 netif_carrier_on(dev);
701 break;
702 case NL80211_IFTYPE_P2P_DEVICE:
703 rcu_assign_pointer(local->p2p_sdata, sdata);
704 break;
705 case NL80211_IFTYPE_MONITOR:
706 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
707 break;
708 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
709 break;
710 default:
711 break;
712 }
713
714 /*
715 * set_multicast_list will be invoked by the networking core
716 * which will check whether any increments here were done in
717 * error and sync them down to the hardware as filter flags.
718 */
719 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
720 atomic_inc(&local->iff_allmultis);
721
722 if (coming_up)
723 local->open_count++;
724
725 if (hw_reconf_flags)
726 ieee80211_hw_config(local, hw_reconf_flags);
727
728 ieee80211_recalc_ps(local);
729
730 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
731 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
732 local->ops->wake_tx_queue) {
733 /* XXX: for AP_VLAN, actually track AP queues */
734 if (dev)
735 netif_tx_start_all_queues(dev);
736 } else if (dev) {
737 unsigned long flags;
738 int n_acs = IEEE80211_NUM_ACS;
739 int ac;
740
741 if (local->hw.queues < IEEE80211_NUM_ACS)
742 n_acs = 1;
743
744 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
745 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
746 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
747 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
748 for (ac = 0; ac < n_acs; ac++) {
749 int ac_queue = sdata->vif.hw_queue[ac];
750
751 if (local->queue_stop_reasons[ac_queue] == 0 &&
752 skb_queue_empty(&local->pending[ac_queue]))
753 netif_start_subqueue(dev, ac);
754 }
755 }
756 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
757 }
758
759 return 0;
760 err_del_interface:
761 drv_remove_interface(local, sdata);
762 err_stop:
763 if (!local->open_count)
764 drv_stop(local);
765 err_del_bss:
766 sdata->bss = NULL;
767 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
768 mutex_lock(&local->mtx);
769 list_del(&sdata->u.vlan.list);
770 mutex_unlock(&local->mtx);
771 }
772 /* might already be clear but that doesn't matter */
773 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
774 return res;
775 }
776
777 static int ieee80211_open(struct net_device *dev)
778 {
779 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
780 int err;
781
782 /* fail early if user set an invalid address */
783 if (!is_valid_ether_addr(dev->dev_addr))
784 return -EADDRNOTAVAIL;
785
786 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
787 if (err)
788 return err;
789
790 return ieee80211_do_open(&sdata->wdev, true);
791 }
792
793 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
794 bool going_down)
795 {
796 struct ieee80211_local *local = sdata->local;
797 unsigned long flags;
798 struct sk_buff *skb, *tmp;
799 u32 hw_reconf_flags = 0;
800 int i, flushed;
801 struct ps_data *ps;
802 struct cfg80211_chan_def chandef;
803 bool cancel_scan;
804 struct cfg80211_nan_func *func;
805
806 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
807
808 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
809 if (cancel_scan)
810 ieee80211_scan_cancel(local);
811
812 /*
813 * Stop TX on this interface first.
814 */
815 if (sdata->dev)
816 netif_tx_stop_all_queues(sdata->dev);
817
818 ieee80211_roc_purge(local, sdata);
819
820 switch (sdata->vif.type) {
821 case NL80211_IFTYPE_STATION:
822 ieee80211_mgd_stop(sdata);
823 break;
824 case NL80211_IFTYPE_ADHOC:
825 ieee80211_ibss_stop(sdata);
826 break;
827 case NL80211_IFTYPE_AP:
828 cancel_work_sync(&sdata->u.ap.request_smps_work);
829 break;
830 case NL80211_IFTYPE_MONITOR:
831 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
832 break;
833 list_del_rcu(&sdata->u.mntr.list);
834 break;
835 default:
836 break;
837 }
838
839 /*
840 * Remove all stations associated with this interface.
841 *
842 * This must be done before calling ops->remove_interface()
843 * because otherwise we can later invoke ops->sta_notify()
844 * whenever the STAs are removed, and that invalidates driver
845 * assumptions about always getting a vif pointer that is valid
846 * (because if we remove a STA after ops->remove_interface()
847 * the driver will have removed the vif info already!)
848 *
849 * In WDS mode a station must exist here and be flushed, for
850 * AP_VLANs stations may exist since there's nothing else that
851 * would have removed them, but in other modes there shouldn't
852 * be any stations.
853 */
854 flushed = sta_info_flush(sdata);
855 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
856 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
857 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
858
859 /* don't count this interface for allmulti while it is down */
860 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
861 atomic_dec(&local->iff_allmultis);
862
863 if (sdata->vif.type == NL80211_IFTYPE_AP) {
864 local->fif_pspoll--;
865 local->fif_probe_req--;
866 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
867 local->fif_probe_req--;
868 }
869
870 if (sdata->dev) {
871 netif_addr_lock_bh(sdata->dev);
872 spin_lock_bh(&local->filter_lock);
873 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
874 sdata->dev->addr_len);
875 spin_unlock_bh(&local->filter_lock);
876 netif_addr_unlock_bh(sdata->dev);
877 }
878
879 del_timer_sync(&local->dynamic_ps_timer);
880 cancel_work_sync(&local->dynamic_ps_enable_work);
881
882 cancel_work_sync(&sdata->recalc_smps);
883 sdata_lock(sdata);
884 mutex_lock(&local->mtx);
885 sdata->vif.csa_active = false;
886 if (sdata->vif.type == NL80211_IFTYPE_STATION)
887 sdata->u.mgd.csa_waiting_bcn = false;
888 if (sdata->csa_block_tx) {
889 ieee80211_wake_vif_queues(local, sdata,
890 IEEE80211_QUEUE_STOP_REASON_CSA);
891 sdata->csa_block_tx = false;
892 }
893 mutex_unlock(&local->mtx);
894 sdata_unlock(sdata);
895
896 cancel_work_sync(&sdata->csa_finalize_work);
897
898 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
899
900 if (sdata->wdev.cac_started) {
901 chandef = sdata->vif.bss_conf.chandef;
902 WARN_ON(local->suspended);
903 mutex_lock(&local->mtx);
904 ieee80211_vif_release_channel(sdata);
905 mutex_unlock(&local->mtx);
906 cfg80211_cac_event(sdata->dev, &chandef,
907 NL80211_RADAR_CAC_ABORTED,
908 GFP_KERNEL);
909 }
910
911 /* APs need special treatment */
912 if (sdata->vif.type == NL80211_IFTYPE_AP) {
913 struct ieee80211_sub_if_data *vlan, *tmpsdata;
914
915 /* down all dependent devices, that is VLANs */
916 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
917 u.vlan.list)
918 dev_close(vlan->dev);
919 WARN_ON(!list_empty(&sdata->u.ap.vlans));
920 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
921 /* remove all packets in parent bc_buf pointing to this dev */
922 ps = &sdata->bss->ps;
923
924 spin_lock_irqsave(&ps->bc_buf.lock, flags);
925 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
926 if (skb->dev == sdata->dev) {
927 __skb_unlink(skb, &ps->bc_buf);
928 local->total_ps_buffered--;
929 ieee80211_free_txskb(&local->hw, skb);
930 }
931 }
932 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
933 }
934
935 if (going_down)
936 local->open_count--;
937
938 switch (sdata->vif.type) {
939 case NL80211_IFTYPE_AP_VLAN:
940 mutex_lock(&local->mtx);
941 list_del(&sdata->u.vlan.list);
942 mutex_unlock(&local->mtx);
943 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
944 /* see comment in the default case below */
945 ieee80211_free_keys(sdata, true);
946 /* no need to tell driver */
947 break;
948 case NL80211_IFTYPE_MONITOR:
949 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
950 local->cooked_mntrs--;
951 break;
952 }
953
954 local->monitors--;
955 if (local->monitors == 0) {
956 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
957 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
958 }
959
960 ieee80211_adjust_monitor_flags(sdata, -1);
961 break;
962 case NL80211_IFTYPE_NAN:
963 /* clean all the functions */
964 spin_lock_bh(&sdata->u.nan.func_lock);
965
966 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
967 idr_remove(&sdata->u.nan.function_inst_ids, i);
968 cfg80211_free_nan_func(func);
969 }
970 idr_destroy(&sdata->u.nan.function_inst_ids);
971
972 spin_unlock_bh(&sdata->u.nan.func_lock);
973 break;
974 case NL80211_IFTYPE_P2P_DEVICE:
975 /* relies on synchronize_rcu() below */
976 RCU_INIT_POINTER(local->p2p_sdata, NULL);
977 /* fall through */
978 default:
979 cancel_work_sync(&sdata->work);
980 /*
981 * When we get here, the interface is marked down.
982 * Free the remaining keys, if there are any
983 * (which can happen in AP mode if userspace sets
984 * keys before the interface is operating, and maybe
985 * also in WDS mode)
986 *
987 * Force the key freeing to always synchronize_net()
988 * to wait for the RX path in case it is using this
989 * interface enqueuing frames at this very time on
990 * another CPU.
991 */
992 ieee80211_free_keys(sdata, true);
993 skb_queue_purge(&sdata->skb_queue);
994 }
995
996 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
997 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
998 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
999 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1000 if (info->control.vif == &sdata->vif) {
1001 __skb_unlink(skb, &local->pending[i]);
1002 ieee80211_free_txskb(&local->hw, skb);
1003 }
1004 }
1005 }
1006 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1007
1008 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1009 ieee80211_txq_remove_vlan(local, sdata);
1010
1011 sdata->bss = NULL;
1012
1013 if (local->open_count == 0)
1014 ieee80211_clear_tx_pending(local);
1015
1016 /*
1017 * If the interface goes down while suspended, presumably because
1018 * the device was unplugged and that happens before our resume,
1019 * then the driver is already unconfigured and the remainder of
1020 * this function isn't needed.
1021 * XXX: what about WoWLAN? If the device has software state, e.g.
1022 * memory allocated, it might expect teardown commands from
1023 * mac80211 here?
1024 */
1025 if (local->suspended) {
1026 WARN_ON(local->wowlan);
1027 WARN_ON(rtnl_dereference(local->monitor_sdata));
1028 return;
1029 }
1030
1031 switch (sdata->vif.type) {
1032 case NL80211_IFTYPE_AP_VLAN:
1033 break;
1034 case NL80211_IFTYPE_MONITOR:
1035 if (local->monitors == 0)
1036 ieee80211_del_virtual_monitor(local);
1037
1038 mutex_lock(&local->mtx);
1039 ieee80211_recalc_idle(local);
1040 mutex_unlock(&local->mtx);
1041
1042 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1043 break;
1044
1045 /* fall through */
1046 default:
1047 if (going_down)
1048 drv_remove_interface(local, sdata);
1049 }
1050
1051 ieee80211_recalc_ps(local);
1052
1053 if (cancel_scan)
1054 flush_delayed_work(&local->scan_work);
1055
1056 if (local->open_count == 0) {
1057 ieee80211_stop_device(local);
1058
1059 /* no reconfiguring after stop! */
1060 return;
1061 }
1062
1063 /* do after stop to avoid reconfiguring when we stop anyway */
1064 ieee80211_configure_filter(local);
1065 ieee80211_hw_config(local, hw_reconf_flags);
1066
1067 if (local->monitors == local->open_count)
1068 ieee80211_add_virtual_monitor(local);
1069 }
1070
1071 static int ieee80211_stop(struct net_device *dev)
1072 {
1073 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1074
1075 ieee80211_do_stop(sdata, true);
1076
1077 return 0;
1078 }
1079
1080 static void ieee80211_set_multicast_list(struct net_device *dev)
1081 {
1082 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1083 struct ieee80211_local *local = sdata->local;
1084 int allmulti, sdata_allmulti;
1085
1086 allmulti = !!(dev->flags & IFF_ALLMULTI);
1087 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1088
1089 if (allmulti != sdata_allmulti) {
1090 if (dev->flags & IFF_ALLMULTI)
1091 atomic_inc(&local->iff_allmultis);
1092 else
1093 atomic_dec(&local->iff_allmultis);
1094 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1095 }
1096
1097 spin_lock_bh(&local->filter_lock);
1098 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1099 spin_unlock_bh(&local->filter_lock);
1100 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1101 }
1102
1103 /*
1104 * Called when the netdev is removed or, by the code below, before
1105 * the interface type changes.
1106 */
1107 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1108 {
1109 int i;
1110
1111 /* free extra data */
1112 ieee80211_free_keys(sdata, false);
1113
1114 ieee80211_debugfs_remove_netdev(sdata);
1115
1116 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1117 __skb_queue_purge(&sdata->fragments[i].skb_list);
1118 sdata->fragment_next = 0;
1119
1120 if (ieee80211_vif_is_mesh(&sdata->vif))
1121 ieee80211_mesh_teardown_sdata(sdata);
1122 }
1123
1124 static void ieee80211_uninit(struct net_device *dev)
1125 {
1126 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1127 }
1128
1129 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1130 struct sk_buff *skb,
1131 void *accel_priv,
1132 select_queue_fallback_t fallback)
1133 {
1134 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1135 }
1136
1137 static void
1138 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1139 {
1140 int i;
1141
1142 for_each_possible_cpu(i) {
1143 const struct pcpu_sw_netstats *tstats;
1144 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1145 unsigned int start;
1146
1147 tstats = per_cpu_ptr(dev->tstats, i);
1148
1149 do {
1150 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1151 rx_packets = tstats->rx_packets;
1152 tx_packets = tstats->tx_packets;
1153 rx_bytes = tstats->rx_bytes;
1154 tx_bytes = tstats->tx_bytes;
1155 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1156
1157 stats->rx_packets += rx_packets;
1158 stats->tx_packets += tx_packets;
1159 stats->rx_bytes += rx_bytes;
1160 stats->tx_bytes += tx_bytes;
1161 }
1162 }
1163
1164 static const struct net_device_ops ieee80211_dataif_ops = {
1165 .ndo_open = ieee80211_open,
1166 .ndo_stop = ieee80211_stop,
1167 .ndo_uninit = ieee80211_uninit,
1168 .ndo_start_xmit = ieee80211_subif_start_xmit,
1169 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1170 .ndo_set_mac_address = ieee80211_change_mac,
1171 .ndo_select_queue = ieee80211_netdev_select_queue,
1172 .ndo_get_stats64 = ieee80211_get_stats64,
1173 };
1174
1175 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1176 struct sk_buff *skb,
1177 void *accel_priv,
1178 select_queue_fallback_t fallback)
1179 {
1180 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181 struct ieee80211_local *local = sdata->local;
1182 struct ieee80211_hdr *hdr;
1183 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1184
1185 if (local->hw.queues < IEEE80211_NUM_ACS)
1186 return 0;
1187
1188 if (skb->len < 4 ||
1189 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1190 return 0; /* doesn't matter, frame will be dropped */
1191
1192 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1193
1194 return ieee80211_select_queue_80211(sdata, skb, hdr);
1195 }
1196
1197 static const struct net_device_ops ieee80211_monitorif_ops = {
1198 .ndo_open = ieee80211_open,
1199 .ndo_stop = ieee80211_stop,
1200 .ndo_uninit = ieee80211_uninit,
1201 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1202 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1203 .ndo_set_mac_address = ieee80211_change_mac,
1204 .ndo_select_queue = ieee80211_monitor_select_queue,
1205 .ndo_get_stats64 = ieee80211_get_stats64,
1206 };
1207
1208 static void ieee80211_if_free(struct net_device *dev)
1209 {
1210 free_percpu(dev->tstats);
1211 }
1212
1213 static void ieee80211_if_setup(struct net_device *dev)
1214 {
1215 ether_setup(dev);
1216 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1217 dev->netdev_ops = &ieee80211_dataif_ops;
1218 dev->needs_free_netdev = true;
1219 dev->priv_destructor = ieee80211_if_free;
1220 }
1221
1222 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1223 {
1224 ieee80211_if_setup(dev);
1225 dev->priv_flags |= IFF_NO_QUEUE;
1226 }
1227
1228 static void ieee80211_iface_work(struct work_struct *work)
1229 {
1230 struct ieee80211_sub_if_data *sdata =
1231 container_of(work, struct ieee80211_sub_if_data, work);
1232 struct ieee80211_local *local = sdata->local;
1233 struct sk_buff *skb;
1234 struct sta_info *sta;
1235
1236 if (!ieee80211_sdata_running(sdata))
1237 return;
1238
1239 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1240 return;
1241
1242 if (!ieee80211_can_run_worker(local))
1243 return;
1244
1245 /* first process frames */
1246 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1247 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1248
1249 if (ieee80211_is_action(mgmt->frame_control) &&
1250 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1251 int len = skb->len;
1252
1253 mutex_lock(&local->sta_mtx);
1254 sta = sta_info_get_bss(sdata, mgmt->sa);
1255 if (sta) {
1256 switch (mgmt->u.action.u.addba_req.action_code) {
1257 case WLAN_ACTION_ADDBA_REQ:
1258 ieee80211_process_addba_request(
1259 local, sta, mgmt, len);
1260 break;
1261 case WLAN_ACTION_ADDBA_RESP:
1262 ieee80211_process_addba_resp(local, sta,
1263 mgmt, len);
1264 break;
1265 case WLAN_ACTION_DELBA:
1266 ieee80211_process_delba(sdata, sta,
1267 mgmt, len);
1268 break;
1269 default:
1270 WARN_ON(1);
1271 break;
1272 }
1273 }
1274 mutex_unlock(&local->sta_mtx);
1275 } else if (ieee80211_is_action(mgmt->frame_control) &&
1276 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1277 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1278 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1279 struct ieee80211_rx_status *status;
1280 enum nl80211_band band;
1281 u8 opmode;
1282
1283 status = IEEE80211_SKB_RXCB(skb);
1284 band = status->band;
1285 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1286
1287 mutex_lock(&local->sta_mtx);
1288 sta = sta_info_get_bss(sdata, mgmt->sa);
1289
1290 if (sta)
1291 ieee80211_vht_handle_opmode(sdata, sta,
1292 opmode,
1293 band);
1294
1295 mutex_unlock(&local->sta_mtx);
1296 break;
1297 }
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 WARN_ON(1);
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 /* 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 type != NL80211_IFTYPE_AP_VLAN &&
1758 type != NL80211_IFTYPE_MONITOR)
1759 txq_size += sizeof(struct txq_info) +
1760 local->hw.txq_data_size;
1761
1762 if (local->ops->wake_tx_queue)
1763 if_setup = ieee80211_if_setup_no_queue;
1764 else
1765 if_setup = ieee80211_if_setup;
1766
1767 if (local->hw.queues >= IEEE80211_NUM_ACS)
1768 txqs = IEEE80211_NUM_ACS;
1769
1770 ndev = alloc_netdev_mqs(size + txq_size,
1771 name, name_assign_type,
1772 if_setup, txqs, 1);
1773 if (!ndev)
1774 return -ENOMEM;
1775 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1776
1777 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1778 if (!ndev->tstats) {
1779 free_netdev(ndev);
1780 return -ENOMEM;
1781 }
1782
1783 ndev->needed_headroom = local->tx_headroom +
1784 4*6 /* four MAC addresses */
1785 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1786 + 6 /* mesh */
1787 + 8 /* rfc1042/bridge tunnel */
1788 - ETH_HLEN /* ethernet hard_header_len */
1789 + IEEE80211_ENCRYPT_HEADROOM;
1790 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1791
1792 ret = dev_alloc_name(ndev, ndev->name);
1793 if (ret < 0) {
1794 ieee80211_if_free(ndev);
1795 free_netdev(ndev);
1796 return ret;
1797 }
1798
1799 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1800 if (params && is_valid_ether_addr(params->macaddr))
1801 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1802 else
1803 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1804 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1805
1806 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1807 sdata = netdev_priv(ndev);
1808 ndev->ieee80211_ptr = &sdata->wdev;
1809 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1810 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1811
1812 if (txq_size) {
1813 txqi = netdev_priv(ndev) + size;
1814 ieee80211_txq_init(sdata, NULL, txqi, 0);
1815 }
1816
1817 sdata->dev = ndev;
1818 }
1819
1820 /* initialise type-independent data */
1821 sdata->wdev.wiphy = local->hw.wiphy;
1822 sdata->local = local;
1823
1824 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1825 skb_queue_head_init(&sdata->fragments[i].skb_list);
1826
1827 INIT_LIST_HEAD(&sdata->key_list);
1828
1829 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1830 ieee80211_dfs_cac_timer_work);
1831 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1832 ieee80211_delayed_tailroom_dec);
1833
1834 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1835 struct ieee80211_supported_band *sband;
1836 sband = local->hw.wiphy->bands[i];
1837 sdata->rc_rateidx_mask[i] =
1838 sband ? (1 << sband->n_bitrates) - 1 : 0;
1839 if (sband) {
1840 __le16 cap;
1841 u16 *vht_rate_mask;
1842
1843 memcpy(sdata->rc_rateidx_mcs_mask[i],
1844 sband->ht_cap.mcs.rx_mask,
1845 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1846
1847 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1848 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1849 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1850 } else {
1851 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1852 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1853 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1854 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1855 }
1856 }
1857
1858 ieee80211_set_default_queues(sdata);
1859
1860 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1861 sdata->user_power_level = local->user_power_level;
1862
1863 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1864
1865 /* setup type-dependent data */
1866 ieee80211_setup_sdata(sdata, type);
1867
1868 if (ndev) {
1869 if (params) {
1870 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1871 if (type == NL80211_IFTYPE_STATION)
1872 sdata->u.mgd.use_4addr = params->use_4addr;
1873 }
1874
1875 ndev->features |= local->hw.netdev_features;
1876
1877 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1878
1879 /* MTU range: 256 - 2304 */
1880 ndev->min_mtu = 256;
1881 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1882
1883 ret = register_netdevice(ndev);
1884 if (ret) {
1885 free_netdev(ndev);
1886 return ret;
1887 }
1888 }
1889
1890 mutex_lock(&local->iflist_mtx);
1891 list_add_tail_rcu(&sdata->list, &local->interfaces);
1892 mutex_unlock(&local->iflist_mtx);
1893
1894 if (new_wdev)
1895 *new_wdev = &sdata->wdev;
1896
1897 return 0;
1898 }
1899
1900 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1901 {
1902 ASSERT_RTNL();
1903
1904 mutex_lock(&sdata->local->iflist_mtx);
1905 list_del_rcu(&sdata->list);
1906 mutex_unlock(&sdata->local->iflist_mtx);
1907
1908 synchronize_rcu();
1909
1910 if (sdata->dev) {
1911 unregister_netdevice(sdata->dev);
1912 } else {
1913 cfg80211_unregister_wdev(&sdata->wdev);
1914 ieee80211_teardown_sdata(sdata);
1915 kfree(sdata);
1916 }
1917 }
1918
1919 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1920 {
1921 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1922 return;
1923 ieee80211_do_stop(sdata, true);
1924 }
1925
1926 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1927 {
1928 struct ieee80211_sub_if_data *sdata, *tmp;
1929 LIST_HEAD(unreg_list);
1930 LIST_HEAD(wdev_list);
1931
1932 ASSERT_RTNL();
1933
1934 /* Before destroying the interfaces, make sure they're all stopped so
1935 * that the hardware is stopped. Otherwise, the driver might still be
1936 * iterating the interfaces during the shutdown, e.g. from a worker
1937 * or from RX processing or similar, and if it does so (using atomic
1938 * iteration) while we're manipulating the list, the iteration will
1939 * crash.
1940 *
1941 * After this, the hardware should be stopped and the driver should
1942 * have stopped all of its activities, so that we can do RCU-unaware
1943 * manipulations of the interface list below.
1944 */
1945 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1946
1947 WARN(local->open_count, "%s: open count remains %d\n",
1948 wiphy_name(local->hw.wiphy), local->open_count);
1949
1950 mutex_lock(&local->iflist_mtx);
1951 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1952 list_del(&sdata->list);
1953
1954 if (sdata->dev)
1955 unregister_netdevice_queue(sdata->dev, &unreg_list);
1956 else
1957 list_add(&sdata->list, &wdev_list);
1958 }
1959 mutex_unlock(&local->iflist_mtx);
1960 unregister_netdevice_many(&unreg_list);
1961
1962 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1963 list_del(&sdata->list);
1964 cfg80211_unregister_wdev(&sdata->wdev);
1965 kfree(sdata);
1966 }
1967 }
1968
1969 static int netdev_notify(struct notifier_block *nb,
1970 unsigned long state, void *ptr)
1971 {
1972 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1973 struct ieee80211_sub_if_data *sdata;
1974
1975 if (state != NETDEV_CHANGENAME)
1976 return NOTIFY_DONE;
1977
1978 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1979 return NOTIFY_DONE;
1980
1981 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1982 return NOTIFY_DONE;
1983
1984 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1985 memcpy(sdata->name, dev->name, IFNAMSIZ);
1986 ieee80211_debugfs_rename_netdev(sdata);
1987
1988 return NOTIFY_OK;
1989 }
1990
1991 static struct notifier_block mac80211_netdev_notifier = {
1992 .notifier_call = netdev_notify,
1993 };
1994
1995 int ieee80211_iface_init(void)
1996 {
1997 return register_netdevice_notifier(&mac80211_netdev_notifier);
1998 }
1999
2000 void ieee80211_iface_exit(void)
2001 {
2002 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2003 }
2004
2005 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2006 {
2007 if (sdata->vif.type == NL80211_IFTYPE_AP)
2008 atomic_inc(&sdata->u.ap.num_mcast_sta);
2009 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2010 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2011 }
2012
2013 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2014 {
2015 if (sdata->vif.type == NL80211_IFTYPE_AP)
2016 atomic_dec(&sdata->u.ap.num_mcast_sta);
2017 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2018 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2019 }
CRIS linux kernel tree