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[deliverable/linux.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/if_arp.h>
17 #include <linux/netdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29
30 /**
31 * DOC: Interface list locking
32 *
33 * The interface list in each struct ieee80211_local is protected
34 * three-fold:
35 *
36 * (1) modifications may only be done under the RTNL
37 * (2) modifications and readers are protected against each other by
38 * the iflist_mtx.
39 * (3) modifications are done in an RCU manner so atomic readers
40 * can traverse the list in RCU-safe blocks.
41 *
42 * As a consequence, reads (traversals) of the list can be protected
43 * by either the RTNL, the iflist_mtx or RCU.
44 */
45
46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
47 {
48 struct ieee80211_chanctx_conf *chanctx_conf;
49 int power;
50
51 rcu_read_lock();
52 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
53 if (!chanctx_conf) {
54 rcu_read_unlock();
55 return false;
56 }
57
58 power = ieee80211_chandef_max_power(&chanctx_conf->def);
59 rcu_read_unlock();
60
61 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
62 power = min(power, sdata->user_power_level);
63
64 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->ap_power_level);
66
67 if (power != sdata->vif.bss_conf.txpower) {
68 sdata->vif.bss_conf.txpower = power;
69 ieee80211_hw_config(sdata->local, 0);
70 return true;
71 }
72
73 return false;
74 }
75
76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
77 bool update_bss)
78 {
79 if (__ieee80211_recalc_txpower(sdata) ||
80 (update_bss && ieee80211_sdata_running(sdata)))
81 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
82 }
83
84 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
85 {
86 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
87 return 0;
88
89 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
90 return IEEE80211_CONF_CHANGE_IDLE;
91 }
92
93 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
94 {
95 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
96 return 0;
97
98 ieee80211_flush_queues(local, NULL, false);
99
100 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
101 return IEEE80211_CONF_CHANGE_IDLE;
102 }
103
104 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
105 bool force_active)
106 {
107 bool working, scanning, active;
108 unsigned int led_trig_start = 0, led_trig_stop = 0;
109
110 lockdep_assert_held(&local->mtx);
111
112 active = force_active ||
113 !list_empty(&local->chanctx_list) ||
114 local->monitors;
115
116 working = !local->ops->remain_on_channel &&
117 !list_empty(&local->roc_list);
118
119 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122 if (working || scanning)
123 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124 else
125 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127 if (active)
128 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129 else
130 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134 if (working || scanning || active)
135 return __ieee80211_idle_off(local);
136 return __ieee80211_idle_on(local);
137 }
138
139 u32 ieee80211_idle_off(struct ieee80211_local *local)
140 {
141 return __ieee80211_recalc_idle(local, true);
142 }
143
144 void ieee80211_recalc_idle(struct ieee80211_local *local)
145 {
146 u32 change = __ieee80211_recalc_idle(local, false);
147 if (change)
148 ieee80211_hw_config(local, change);
149 }
150
151 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
152 {
153 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
154 return -EINVAL;
155
156 dev->mtu = new_mtu;
157 return 0;
158 }
159
160 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
161 bool check_dup)
162 {
163 struct ieee80211_local *local = sdata->local;
164 struct ieee80211_sub_if_data *iter;
165 u64 new, mask, tmp;
166 u8 *m;
167 int ret = 0;
168
169 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
170 return 0;
171
172 m = addr;
173 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176
177 m = local->hw.wiphy->addr_mask;
178 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182 if (!check_dup)
183 return ret;
184
185 mutex_lock(&local->iflist_mtx);
186 list_for_each_entry(iter, &local->interfaces, list) {
187 if (iter == sdata)
188 continue;
189
190 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
191 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
192 continue;
193
194 m = iter->vif.addr;
195 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
196 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
197 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
198
199 if ((new & ~mask) != (tmp & ~mask)) {
200 ret = -EINVAL;
201 break;
202 }
203 }
204 mutex_unlock(&local->iflist_mtx);
205
206 return ret;
207 }
208
209 static int ieee80211_change_mac(struct net_device *dev, void *addr)
210 {
211 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
212 struct sockaddr *sa = addr;
213 bool check_dup = true;
214 int ret;
215
216 if (ieee80211_sdata_running(sdata))
217 return -EBUSY;
218
219 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
220 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
221 check_dup = false;
222
223 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
224 if (ret)
225 return ret;
226
227 ret = eth_mac_addr(dev, sa);
228
229 if (ret == 0)
230 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
231
232 return ret;
233 }
234
235 static inline int identical_mac_addr_allowed(int type1, int type2)
236 {
237 return type1 == NL80211_IFTYPE_MONITOR ||
238 type2 == NL80211_IFTYPE_MONITOR ||
239 type1 == NL80211_IFTYPE_P2P_DEVICE ||
240 type2 == NL80211_IFTYPE_P2P_DEVICE ||
241 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
242 (type1 == NL80211_IFTYPE_WDS &&
243 (type2 == NL80211_IFTYPE_WDS ||
244 type2 == NL80211_IFTYPE_AP)) ||
245 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
246 (type1 == NL80211_IFTYPE_AP_VLAN &&
247 (type2 == NL80211_IFTYPE_AP ||
248 type2 == NL80211_IFTYPE_AP_VLAN));
249 }
250
251 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
252 enum nl80211_iftype iftype)
253 {
254 struct ieee80211_local *local = sdata->local;
255 struct ieee80211_sub_if_data *nsdata;
256 int ret;
257
258 ASSERT_RTNL();
259
260 /* we hold the RTNL here so can safely walk the list */
261 list_for_each_entry(nsdata, &local->interfaces, list) {
262 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
263 /*
264 * Only OCB and monitor mode may coexist
265 */
266 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
267 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
268 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
269 nsdata->vif.type == NL80211_IFTYPE_OCB))
270 return -EBUSY;
271
272 /*
273 * Allow only a single IBSS interface to be up at any
274 * time. This is restricted because beacon distribution
275 * cannot work properly if both are in the same IBSS.
276 *
277 * To remove this restriction we'd have to disallow them
278 * from setting the same SSID on different IBSS interfaces
279 * belonging to the same hardware. Then, however, we're
280 * faced with having to adopt two different TSF timers...
281 */
282 if (iftype == NL80211_IFTYPE_ADHOC &&
283 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
284 return -EBUSY;
285 /*
286 * will not add another interface while any channel
287 * switch is active.
288 */
289 if (nsdata->vif.csa_active)
290 return -EBUSY;
291
292 /*
293 * The remaining checks are only performed for interfaces
294 * with the same MAC address.
295 */
296 if (!ether_addr_equal(sdata->vif.addr,
297 nsdata->vif.addr))
298 continue;
299
300 /*
301 * check whether it may have the same address
302 */
303 if (!identical_mac_addr_allowed(iftype,
304 nsdata->vif.type))
305 return -ENOTUNIQ;
306
307 /*
308 * can only add VLANs to enabled APs
309 */
310 if (iftype == NL80211_IFTYPE_AP_VLAN &&
311 nsdata->vif.type == NL80211_IFTYPE_AP)
312 sdata->bss = &nsdata->u.ap;
313 }
314 }
315
316 mutex_lock(&local->chanctx_mtx);
317 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
318 mutex_unlock(&local->chanctx_mtx);
319 return ret;
320 }
321
322 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
323 enum nl80211_iftype iftype)
324 {
325 int n_queues = sdata->local->hw.queues;
326 int i;
327
328 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
329 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
331 IEEE80211_INVAL_HW_QUEUE))
332 return -EINVAL;
333 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
334 n_queues))
335 return -EINVAL;
336 }
337 }
338
339 if ((iftype != NL80211_IFTYPE_AP &&
340 iftype != NL80211_IFTYPE_P2P_GO &&
341 iftype != NL80211_IFTYPE_MESH_POINT) ||
342 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
343 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
344 return 0;
345 }
346
347 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
348 return -EINVAL;
349
350 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
351 return -EINVAL;
352
353 return 0;
354 }
355
356 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
357 const int offset)
358 {
359 struct ieee80211_local *local = sdata->local;
360 u32 flags = sdata->u.mntr_flags;
361
362 #define ADJUST(_f, _s) do { \
363 if (flags & MONITOR_FLAG_##_f) \
364 local->fif_##_s += offset; \
365 } while (0)
366
367 ADJUST(FCSFAIL, fcsfail);
368 ADJUST(PLCPFAIL, plcpfail);
369 ADJUST(CONTROL, control);
370 ADJUST(CONTROL, pspoll);
371 ADJUST(OTHER_BSS, other_bss);
372
373 #undef ADJUST
374 }
375
376 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
377 {
378 struct ieee80211_local *local = sdata->local;
379 int i;
380
381 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
382 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
383 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
384 else if (local->hw.queues >= IEEE80211_NUM_ACS)
385 sdata->vif.hw_queue[i] = i;
386 else
387 sdata->vif.hw_queue[i] = 0;
388 }
389 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
390 }
391
392 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
393 {
394 struct ieee80211_sub_if_data *sdata;
395 int ret;
396
397 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
398 return 0;
399
400 ASSERT_RTNL();
401
402 if (local->monitor_sdata)
403 return 0;
404
405 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
406 if (!sdata)
407 return -ENOMEM;
408
409 /* set up data */
410 sdata->local = local;
411 sdata->vif.type = NL80211_IFTYPE_MONITOR;
412 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
413 wiphy_name(local->hw.wiphy));
414 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
415
416 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
417
418 ieee80211_set_default_queues(sdata);
419
420 ret = drv_add_interface(local, sdata);
421 if (WARN_ON(ret)) {
422 /* ok .. stupid driver, it asked for this! */
423 kfree(sdata);
424 return ret;
425 }
426
427 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
428 if (ret) {
429 kfree(sdata);
430 return ret;
431 }
432
433 mutex_lock(&local->iflist_mtx);
434 rcu_assign_pointer(local->monitor_sdata, sdata);
435 mutex_unlock(&local->iflist_mtx);
436
437 mutex_lock(&local->mtx);
438 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
439 IEEE80211_CHANCTX_EXCLUSIVE);
440 mutex_unlock(&local->mtx);
441 if (ret) {
442 mutex_lock(&local->iflist_mtx);
443 RCU_INIT_POINTER(local->monitor_sdata, NULL);
444 mutex_unlock(&local->iflist_mtx);
445 synchronize_net();
446 drv_remove_interface(local, sdata);
447 kfree(sdata);
448 return ret;
449 }
450
451 return 0;
452 }
453
454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
455 {
456 struct ieee80211_sub_if_data *sdata;
457
458 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
459 return;
460
461 ASSERT_RTNL();
462
463 mutex_lock(&local->iflist_mtx);
464
465 sdata = rcu_dereference_protected(local->monitor_sdata,
466 lockdep_is_held(&local->iflist_mtx));
467 if (!sdata) {
468 mutex_unlock(&local->iflist_mtx);
469 return;
470 }
471
472 RCU_INIT_POINTER(local->monitor_sdata, NULL);
473 mutex_unlock(&local->iflist_mtx);
474
475 synchronize_net();
476
477 mutex_lock(&local->mtx);
478 ieee80211_vif_release_channel(sdata);
479 mutex_unlock(&local->mtx);
480
481 drv_remove_interface(local, sdata);
482
483 kfree(sdata);
484 }
485
486 /*
487 * NOTE: Be very careful when changing this function, it must NOT return
488 * an error on interface type changes that have been pre-checked, so most
489 * checks should be in ieee80211_check_concurrent_iface.
490 */
491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
492 {
493 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
494 struct net_device *dev = wdev->netdev;
495 struct ieee80211_local *local = sdata->local;
496 struct sta_info *sta;
497 u32 changed = 0;
498 int res;
499 u32 hw_reconf_flags = 0;
500
501 switch (sdata->vif.type) {
502 case NL80211_IFTYPE_WDS:
503 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
504 return -ENOLINK;
505 break;
506 case NL80211_IFTYPE_AP_VLAN: {
507 struct ieee80211_sub_if_data *master;
508
509 if (!sdata->bss)
510 return -ENOLINK;
511
512 mutex_lock(&local->mtx);
513 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
514 mutex_unlock(&local->mtx);
515
516 master = container_of(sdata->bss,
517 struct ieee80211_sub_if_data, u.ap);
518 sdata->control_port_protocol =
519 master->control_port_protocol;
520 sdata->control_port_no_encrypt =
521 master->control_port_no_encrypt;
522 sdata->vif.cab_queue = master->vif.cab_queue;
523 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524 sizeof(sdata->vif.hw_queue));
525 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
526
527 mutex_lock(&local->key_mtx);
528 sdata->crypto_tx_tailroom_needed_cnt +=
529 master->crypto_tx_tailroom_needed_cnt;
530 mutex_unlock(&local->key_mtx);
531
532 break;
533 }
534 case NL80211_IFTYPE_AP:
535 sdata->bss = &sdata->u.ap;
536 break;
537 case NL80211_IFTYPE_MESH_POINT:
538 case NL80211_IFTYPE_STATION:
539 case NL80211_IFTYPE_MONITOR:
540 case NL80211_IFTYPE_ADHOC:
541 case NL80211_IFTYPE_P2P_DEVICE:
542 case NL80211_IFTYPE_OCB:
543 /* no special treatment */
544 break;
545 case NL80211_IFTYPE_UNSPECIFIED:
546 case NUM_NL80211_IFTYPES:
547 case NL80211_IFTYPE_P2P_CLIENT:
548 case NL80211_IFTYPE_P2P_GO:
549 /* cannot happen */
550 WARN_ON(1);
551 break;
552 }
553
554 if (local->open_count == 0) {
555 res = drv_start(local);
556 if (res)
557 goto err_del_bss;
558 /* we're brought up, everything changes */
559 hw_reconf_flags = ~0;
560 ieee80211_led_radio(local, true);
561 ieee80211_mod_tpt_led_trig(local,
562 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
563 }
564
565 /*
566 * Copy the hopefully now-present MAC address to
567 * this interface, if it has the special null one.
568 */
569 if (dev && is_zero_ether_addr(dev->dev_addr)) {
570 memcpy(dev->dev_addr,
571 local->hw.wiphy->perm_addr,
572 ETH_ALEN);
573 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
574
575 if (!is_valid_ether_addr(dev->dev_addr)) {
576 res = -EADDRNOTAVAIL;
577 goto err_stop;
578 }
579 }
580
581 switch (sdata->vif.type) {
582 case NL80211_IFTYPE_AP_VLAN:
583 /* no need to tell driver, but set carrier and chanctx */
584 if (rtnl_dereference(sdata->bss->beacon)) {
585 ieee80211_vif_vlan_copy_chanctx(sdata);
586 netif_carrier_on(dev);
587 } else {
588 netif_carrier_off(dev);
589 }
590 break;
591 case NL80211_IFTYPE_MONITOR:
592 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
593 local->cooked_mntrs++;
594 break;
595 }
596
597 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
598 res = drv_add_interface(local, sdata);
599 if (res)
600 goto err_stop;
601 } else if (local->monitors == 0 && local->open_count == 0) {
602 res = ieee80211_add_virtual_monitor(local);
603 if (res)
604 goto err_stop;
605 }
606
607 /* must be before the call to ieee80211_configure_filter */
608 local->monitors++;
609 if (local->monitors == 1) {
610 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
611 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
612 }
613
614 ieee80211_adjust_monitor_flags(sdata, 1);
615 ieee80211_configure_filter(local);
616 mutex_lock(&local->mtx);
617 ieee80211_recalc_idle(local);
618 mutex_unlock(&local->mtx);
619
620 netif_carrier_on(dev);
621 break;
622 default:
623 if (coming_up) {
624 ieee80211_del_virtual_monitor(local);
625
626 res = drv_add_interface(local, sdata);
627 if (res)
628 goto err_stop;
629 res = ieee80211_check_queues(sdata,
630 ieee80211_vif_type_p2p(&sdata->vif));
631 if (res)
632 goto err_del_interface;
633 }
634
635 if (sdata->vif.type == NL80211_IFTYPE_AP) {
636 local->fif_pspoll++;
637 local->fif_probe_req++;
638
639 ieee80211_configure_filter(local);
640 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
641 local->fif_probe_req++;
642 }
643
644 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
645 changed |= ieee80211_reset_erp_info(sdata);
646 ieee80211_bss_info_change_notify(sdata, changed);
647
648 switch (sdata->vif.type) {
649 case NL80211_IFTYPE_STATION:
650 case NL80211_IFTYPE_ADHOC:
651 case NL80211_IFTYPE_AP:
652 case NL80211_IFTYPE_MESH_POINT:
653 case NL80211_IFTYPE_OCB:
654 netif_carrier_off(dev);
655 break;
656 case NL80211_IFTYPE_WDS:
657 case NL80211_IFTYPE_P2P_DEVICE:
658 break;
659 default:
660 /* not reached */
661 WARN_ON(1);
662 }
663
664 /*
665 * Set default queue parameters so drivers don't
666 * need to initialise the hardware if the hardware
667 * doesn't start up with sane defaults.
668 * Enable QoS for anything but station interfaces.
669 */
670 ieee80211_set_wmm_default(sdata, true,
671 sdata->vif.type != NL80211_IFTYPE_STATION);
672 }
673
674 set_bit(SDATA_STATE_RUNNING, &sdata->state);
675
676 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
677 /* Create STA entry for the WDS peer */
678 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
679 GFP_KERNEL);
680 if (!sta) {
681 res = -ENOMEM;
682 goto err_del_interface;
683 }
684
685 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
686 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
687 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
688
689 res = sta_info_insert(sta);
690 if (res) {
691 /* STA has been freed */
692 goto err_del_interface;
693 }
694
695 rate_control_rate_init(sta);
696 netif_carrier_on(dev);
697 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
698 rcu_assign_pointer(local->p2p_sdata, sdata);
699 }
700
701 /*
702 * set_multicast_list will be invoked by the networking core
703 * which will check whether any increments here were done in
704 * error and sync them down to the hardware as filter flags.
705 */
706 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
707 atomic_inc(&local->iff_allmultis);
708
709 if (coming_up)
710 local->open_count++;
711
712 if (hw_reconf_flags)
713 ieee80211_hw_config(local, hw_reconf_flags);
714
715 ieee80211_recalc_ps(local);
716
717 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
718 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
719 /* XXX: for AP_VLAN, actually track AP queues */
720 netif_tx_start_all_queues(dev);
721 } else if (dev) {
722 unsigned long flags;
723 int n_acs = IEEE80211_NUM_ACS;
724 int ac;
725
726 if (local->hw.queues < IEEE80211_NUM_ACS)
727 n_acs = 1;
728
729 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
730 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
731 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
732 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
733 for (ac = 0; ac < n_acs; ac++) {
734 int ac_queue = sdata->vif.hw_queue[ac];
735
736 if (local->queue_stop_reasons[ac_queue] == 0 &&
737 skb_queue_empty(&local->pending[ac_queue]))
738 netif_start_subqueue(dev, ac);
739 }
740 }
741 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
742 }
743
744 return 0;
745 err_del_interface:
746 drv_remove_interface(local, sdata);
747 err_stop:
748 if (!local->open_count)
749 drv_stop(local);
750 err_del_bss:
751 sdata->bss = NULL;
752 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
753 mutex_lock(&local->mtx);
754 list_del(&sdata->u.vlan.list);
755 mutex_unlock(&local->mtx);
756 }
757 /* might already be clear but that doesn't matter */
758 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
759 return res;
760 }
761
762 static int ieee80211_open(struct net_device *dev)
763 {
764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
765 int err;
766
767 /* fail early if user set an invalid address */
768 if (!is_valid_ether_addr(dev->dev_addr))
769 return -EADDRNOTAVAIL;
770
771 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
772 if (err)
773 return err;
774
775 return ieee80211_do_open(&sdata->wdev, true);
776 }
777
778 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
779 bool going_down)
780 {
781 struct ieee80211_local *local = sdata->local;
782 struct fq *fq = &local->fq;
783 unsigned long flags;
784 struct sk_buff *skb, *tmp;
785 u32 hw_reconf_flags = 0;
786 int i, flushed;
787 struct ps_data *ps;
788 struct cfg80211_chan_def chandef;
789 bool cancel_scan;
790
791 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
792
793 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
794 if (cancel_scan)
795 ieee80211_scan_cancel(local);
796
797 /*
798 * Stop TX on this interface first.
799 */
800 if (sdata->dev)
801 netif_tx_stop_all_queues(sdata->dev);
802
803 ieee80211_roc_purge(local, sdata);
804
805 switch (sdata->vif.type) {
806 case NL80211_IFTYPE_STATION:
807 ieee80211_mgd_stop(sdata);
808 break;
809 case NL80211_IFTYPE_ADHOC:
810 ieee80211_ibss_stop(sdata);
811 break;
812 case NL80211_IFTYPE_AP:
813 cancel_work_sync(&sdata->u.ap.request_smps_work);
814 break;
815 default:
816 break;
817 }
818
819 /*
820 * Remove all stations associated with this interface.
821 *
822 * This must be done before calling ops->remove_interface()
823 * because otherwise we can later invoke ops->sta_notify()
824 * whenever the STAs are removed, and that invalidates driver
825 * assumptions about always getting a vif pointer that is valid
826 * (because if we remove a STA after ops->remove_interface()
827 * the driver will have removed the vif info already!)
828 *
829 * In WDS mode a station must exist here and be flushed, for
830 * AP_VLANs stations may exist since there's nothing else that
831 * would have removed them, but in other modes there shouldn't
832 * be any stations.
833 */
834 flushed = sta_info_flush(sdata);
835 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
836 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
837 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
838
839 /* don't count this interface for allmulti while it is down */
840 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
841 atomic_dec(&local->iff_allmultis);
842
843 if (sdata->vif.type == NL80211_IFTYPE_AP) {
844 local->fif_pspoll--;
845 local->fif_probe_req--;
846 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
847 local->fif_probe_req--;
848 }
849
850 if (sdata->dev) {
851 netif_addr_lock_bh(sdata->dev);
852 spin_lock_bh(&local->filter_lock);
853 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
854 sdata->dev->addr_len);
855 spin_unlock_bh(&local->filter_lock);
856 netif_addr_unlock_bh(sdata->dev);
857 }
858
859 del_timer_sync(&local->dynamic_ps_timer);
860 cancel_work_sync(&local->dynamic_ps_enable_work);
861
862 cancel_work_sync(&sdata->recalc_smps);
863 sdata_lock(sdata);
864 mutex_lock(&local->mtx);
865 sdata->vif.csa_active = false;
866 if (sdata->vif.type == NL80211_IFTYPE_STATION)
867 sdata->u.mgd.csa_waiting_bcn = false;
868 if (sdata->csa_block_tx) {
869 ieee80211_wake_vif_queues(local, sdata,
870 IEEE80211_QUEUE_STOP_REASON_CSA);
871 sdata->csa_block_tx = false;
872 }
873 mutex_unlock(&local->mtx);
874 sdata_unlock(sdata);
875
876 cancel_work_sync(&sdata->csa_finalize_work);
877
878 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
879
880 if (sdata->wdev.cac_started) {
881 chandef = sdata->vif.bss_conf.chandef;
882 WARN_ON(local->suspended);
883 mutex_lock(&local->mtx);
884 ieee80211_vif_release_channel(sdata);
885 mutex_unlock(&local->mtx);
886 cfg80211_cac_event(sdata->dev, &chandef,
887 NL80211_RADAR_CAC_ABORTED,
888 GFP_KERNEL);
889 }
890
891 /* APs need special treatment */
892 if (sdata->vif.type == NL80211_IFTYPE_AP) {
893 struct ieee80211_sub_if_data *vlan, *tmpsdata;
894
895 /* down all dependent devices, that is VLANs */
896 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
897 u.vlan.list)
898 dev_close(vlan->dev);
899 WARN_ON(!list_empty(&sdata->u.ap.vlans));
900 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
901 /* remove all packets in parent bc_buf pointing to this dev */
902 ps = &sdata->bss->ps;
903
904 spin_lock_irqsave(&ps->bc_buf.lock, flags);
905 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
906 if (skb->dev == sdata->dev) {
907 __skb_unlink(skb, &ps->bc_buf);
908 local->total_ps_buffered--;
909 ieee80211_free_txskb(&local->hw, skb);
910 }
911 }
912 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
913 }
914
915 if (going_down)
916 local->open_count--;
917
918 switch (sdata->vif.type) {
919 case NL80211_IFTYPE_AP_VLAN:
920 mutex_lock(&local->mtx);
921 list_del(&sdata->u.vlan.list);
922 mutex_unlock(&local->mtx);
923 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
924 /* see comment in the default case below */
925 ieee80211_free_keys(sdata, true);
926 /* no need to tell driver */
927 break;
928 case NL80211_IFTYPE_MONITOR:
929 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
930 local->cooked_mntrs--;
931 break;
932 }
933
934 local->monitors--;
935 if (local->monitors == 0) {
936 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
937 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
938 }
939
940 ieee80211_adjust_monitor_flags(sdata, -1);
941 break;
942 case NL80211_IFTYPE_P2P_DEVICE:
943 /* relies on synchronize_rcu() below */
944 RCU_INIT_POINTER(local->p2p_sdata, NULL);
945 /* fall through */
946 default:
947 cancel_work_sync(&sdata->work);
948 /*
949 * When we get here, the interface is marked down.
950 * Free the remaining keys, if there are any
951 * (which can happen in AP mode if userspace sets
952 * keys before the interface is operating, and maybe
953 * also in WDS mode)
954 *
955 * Force the key freeing to always synchronize_net()
956 * to wait for the RX path in case it is using this
957 * interface enqueuing frames at this very time on
958 * another CPU.
959 */
960 ieee80211_free_keys(sdata, true);
961 skb_queue_purge(&sdata->skb_queue);
962 }
963
964 sdata->bss = NULL;
965
966 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
967 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
968 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
969 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
970 if (info->control.vif == &sdata->vif) {
971 __skb_unlink(skb, &local->pending[i]);
972 ieee80211_free_txskb(&local->hw, skb);
973 }
974 }
975 }
976 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
977
978 if (sdata->vif.txq) {
979 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
980
981 spin_lock_bh(&fq->lock);
982 ieee80211_txq_purge(local, txqi);
983 spin_unlock_bh(&fq->lock);
984 }
985
986 if (local->open_count == 0)
987 ieee80211_clear_tx_pending(local);
988
989 /*
990 * If the interface goes down while suspended, presumably because
991 * the device was unplugged and that happens before our resume,
992 * then the driver is already unconfigured and the remainder of
993 * this function isn't needed.
994 * XXX: what about WoWLAN? If the device has software state, e.g.
995 * memory allocated, it might expect teardown commands from
996 * mac80211 here?
997 */
998 if (local->suspended) {
999 WARN_ON(local->wowlan);
1000 WARN_ON(rtnl_dereference(local->monitor_sdata));
1001 return;
1002 }
1003
1004 switch (sdata->vif.type) {
1005 case NL80211_IFTYPE_AP_VLAN:
1006 break;
1007 case NL80211_IFTYPE_MONITOR:
1008 if (local->monitors == 0)
1009 ieee80211_del_virtual_monitor(local);
1010
1011 mutex_lock(&local->mtx);
1012 ieee80211_recalc_idle(local);
1013 mutex_unlock(&local->mtx);
1014
1015 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1016 break;
1017
1018 /* fall through */
1019 default:
1020 if (going_down)
1021 drv_remove_interface(local, sdata);
1022 }
1023
1024 ieee80211_recalc_ps(local);
1025
1026 if (cancel_scan)
1027 flush_delayed_work(&local->scan_work);
1028
1029 if (local->open_count == 0) {
1030 ieee80211_stop_device(local);
1031
1032 /* no reconfiguring after stop! */
1033 return;
1034 }
1035
1036 /* do after stop to avoid reconfiguring when we stop anyway */
1037 ieee80211_configure_filter(local);
1038 ieee80211_hw_config(local, hw_reconf_flags);
1039
1040 if (local->monitors == local->open_count)
1041 ieee80211_add_virtual_monitor(local);
1042 }
1043
1044 static int ieee80211_stop(struct net_device *dev)
1045 {
1046 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1047
1048 ieee80211_do_stop(sdata, true);
1049
1050 return 0;
1051 }
1052
1053 static void ieee80211_set_multicast_list(struct net_device *dev)
1054 {
1055 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1056 struct ieee80211_local *local = sdata->local;
1057 int allmulti, sdata_allmulti;
1058
1059 allmulti = !!(dev->flags & IFF_ALLMULTI);
1060 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1061
1062 if (allmulti != sdata_allmulti) {
1063 if (dev->flags & IFF_ALLMULTI)
1064 atomic_inc(&local->iff_allmultis);
1065 else
1066 atomic_dec(&local->iff_allmultis);
1067 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1068 }
1069
1070 spin_lock_bh(&local->filter_lock);
1071 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1072 spin_unlock_bh(&local->filter_lock);
1073 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1074 }
1075
1076 /*
1077 * Called when the netdev is removed or, by the code below, before
1078 * the interface type changes.
1079 */
1080 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1081 {
1082 int i;
1083
1084 /* free extra data */
1085 ieee80211_free_keys(sdata, false);
1086
1087 ieee80211_debugfs_remove_netdev(sdata);
1088
1089 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1090 __skb_queue_purge(&sdata->fragments[i].skb_list);
1091 sdata->fragment_next = 0;
1092
1093 if (ieee80211_vif_is_mesh(&sdata->vif))
1094 ieee80211_mesh_teardown_sdata(sdata);
1095 }
1096
1097 static void ieee80211_uninit(struct net_device *dev)
1098 {
1099 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1100 }
1101
1102 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1103 struct sk_buff *skb,
1104 void *accel_priv,
1105 select_queue_fallback_t fallback)
1106 {
1107 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1108 }
1109
1110 static struct rtnl_link_stats64 *
1111 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1112 {
1113 int i;
1114
1115 for_each_possible_cpu(i) {
1116 const struct pcpu_sw_netstats *tstats;
1117 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1118 unsigned int start;
1119
1120 tstats = per_cpu_ptr(dev->tstats, i);
1121
1122 do {
1123 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1124 rx_packets = tstats->rx_packets;
1125 tx_packets = tstats->tx_packets;
1126 rx_bytes = tstats->rx_bytes;
1127 tx_bytes = tstats->tx_bytes;
1128 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1129
1130 stats->rx_packets += rx_packets;
1131 stats->tx_packets += tx_packets;
1132 stats->rx_bytes += rx_bytes;
1133 stats->tx_bytes += tx_bytes;
1134 }
1135
1136 return stats;
1137 }
1138
1139 static const struct net_device_ops ieee80211_dataif_ops = {
1140 .ndo_open = ieee80211_open,
1141 .ndo_stop = ieee80211_stop,
1142 .ndo_uninit = ieee80211_uninit,
1143 .ndo_start_xmit = ieee80211_subif_start_xmit,
1144 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1145 .ndo_change_mtu = ieee80211_change_mtu,
1146 .ndo_set_mac_address = ieee80211_change_mac,
1147 .ndo_select_queue = ieee80211_netdev_select_queue,
1148 .ndo_get_stats64 = ieee80211_get_stats64,
1149 };
1150
1151 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1152 struct sk_buff *skb,
1153 void *accel_priv,
1154 select_queue_fallback_t fallback)
1155 {
1156 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1157 struct ieee80211_local *local = sdata->local;
1158 struct ieee80211_hdr *hdr;
1159 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1160
1161 if (local->hw.queues < IEEE80211_NUM_ACS)
1162 return 0;
1163
1164 if (skb->len < 4 ||
1165 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1166 return 0; /* doesn't matter, frame will be dropped */
1167
1168 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1169
1170 return ieee80211_select_queue_80211(sdata, skb, hdr);
1171 }
1172
1173 static const struct net_device_ops ieee80211_monitorif_ops = {
1174 .ndo_open = ieee80211_open,
1175 .ndo_stop = ieee80211_stop,
1176 .ndo_uninit = ieee80211_uninit,
1177 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1178 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1179 .ndo_change_mtu = ieee80211_change_mtu,
1180 .ndo_set_mac_address = ieee80211_change_mac,
1181 .ndo_select_queue = ieee80211_monitor_select_queue,
1182 .ndo_get_stats64 = ieee80211_get_stats64,
1183 };
1184
1185 static void ieee80211_if_free(struct net_device *dev)
1186 {
1187 free_percpu(dev->tstats);
1188 free_netdev(dev);
1189 }
1190
1191 static void ieee80211_if_setup(struct net_device *dev)
1192 {
1193 ether_setup(dev);
1194 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1195 dev->netdev_ops = &ieee80211_dataif_ops;
1196 dev->destructor = ieee80211_if_free;
1197 }
1198
1199 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1200 {
1201 ieee80211_if_setup(dev);
1202 dev->priv_flags |= IFF_NO_QUEUE;
1203 }
1204
1205 static void ieee80211_iface_work(struct work_struct *work)
1206 {
1207 struct ieee80211_sub_if_data *sdata =
1208 container_of(work, struct ieee80211_sub_if_data, work);
1209 struct ieee80211_local *local = sdata->local;
1210 struct sk_buff *skb;
1211 struct sta_info *sta;
1212 struct ieee80211_ra_tid *ra_tid;
1213 struct ieee80211_rx_agg *rx_agg;
1214
1215 if (!ieee80211_sdata_running(sdata))
1216 return;
1217
1218 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1219 return;
1220
1221 if (!ieee80211_can_run_worker(local))
1222 return;
1223
1224 /* first process frames */
1225 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1226 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1227
1228 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1229 ra_tid = (void *)&skb->cb;
1230 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1231 ra_tid->tid);
1232 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1233 ra_tid = (void *)&skb->cb;
1234 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1235 ra_tid->tid);
1236 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1237 rx_agg = (void *)&skb->cb;
1238 mutex_lock(&local->sta_mtx);
1239 sta = sta_info_get_bss(sdata, rx_agg->addr);
1240 if (sta)
1241 __ieee80211_start_rx_ba_session(sta,
1242 0, 0, 0, 1, rx_agg->tid,
1243 IEEE80211_MAX_AMPDU_BUF,
1244 false, true);
1245 mutex_unlock(&local->sta_mtx);
1246 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1247 rx_agg = (void *)&skb->cb;
1248 mutex_lock(&local->sta_mtx);
1249 sta = sta_info_get_bss(sdata, rx_agg->addr);
1250 if (sta)
1251 __ieee80211_stop_rx_ba_session(sta,
1252 rx_agg->tid,
1253 WLAN_BACK_RECIPIENT, 0,
1254 false);
1255 mutex_unlock(&local->sta_mtx);
1256 } else if (ieee80211_is_action(mgmt->frame_control) &&
1257 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1258 int len = skb->len;
1259
1260 mutex_lock(&local->sta_mtx);
1261 sta = sta_info_get_bss(sdata, mgmt->sa);
1262 if (sta) {
1263 switch (mgmt->u.action.u.addba_req.action_code) {
1264 case WLAN_ACTION_ADDBA_REQ:
1265 ieee80211_process_addba_request(
1266 local, sta, mgmt, len);
1267 break;
1268 case WLAN_ACTION_ADDBA_RESP:
1269 ieee80211_process_addba_resp(local, sta,
1270 mgmt, len);
1271 break;
1272 case WLAN_ACTION_DELBA:
1273 ieee80211_process_delba(sdata, sta,
1274 mgmt, len);
1275 break;
1276 default:
1277 WARN_ON(1);
1278 break;
1279 }
1280 }
1281 mutex_unlock(&local->sta_mtx);
1282 } else if (ieee80211_is_action(mgmt->frame_control) &&
1283 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1284 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1285 case WLAN_VHT_ACTION_GROUPID_MGMT:
1286 ieee80211_process_mu_groups(sdata, mgmt);
1287 break;
1288 default:
1289 WARN_ON(1);
1290 break;
1291 }
1292 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1293 struct ieee80211_hdr *hdr = (void *)mgmt;
1294 /*
1295 * So the frame isn't mgmt, but frame_control
1296 * is at the right place anyway, of course, so
1297 * the if statement is correct.
1298 *
1299 * Warn if we have other data frame types here,
1300 * they must not get here.
1301 */
1302 WARN_ON(hdr->frame_control &
1303 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1304 WARN_ON(!(hdr->seq_ctrl &
1305 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1306 /*
1307 * This was a fragment of a frame, received while
1308 * a block-ack session was active. That cannot be
1309 * right, so terminate the session.
1310 */
1311 mutex_lock(&local->sta_mtx);
1312 sta = sta_info_get_bss(sdata, mgmt->sa);
1313 if (sta) {
1314 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1315 IEEE80211_QOS_CTL_TID_MASK;
1316
1317 __ieee80211_stop_rx_ba_session(
1318 sta, tid, WLAN_BACK_RECIPIENT,
1319 WLAN_REASON_QSTA_REQUIRE_SETUP,
1320 true);
1321 }
1322 mutex_unlock(&local->sta_mtx);
1323 } else switch (sdata->vif.type) {
1324 case NL80211_IFTYPE_STATION:
1325 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1326 break;
1327 case NL80211_IFTYPE_ADHOC:
1328 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1329 break;
1330 case NL80211_IFTYPE_MESH_POINT:
1331 if (!ieee80211_vif_is_mesh(&sdata->vif))
1332 break;
1333 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1334 break;
1335 default:
1336 WARN(1, "frame for unexpected interface type");
1337 break;
1338 }
1339
1340 kfree_skb(skb);
1341 }
1342
1343 /* then other type-dependent work */
1344 switch (sdata->vif.type) {
1345 case NL80211_IFTYPE_STATION:
1346 ieee80211_sta_work(sdata);
1347 break;
1348 case NL80211_IFTYPE_ADHOC:
1349 ieee80211_ibss_work(sdata);
1350 break;
1351 case NL80211_IFTYPE_MESH_POINT:
1352 if (!ieee80211_vif_is_mesh(&sdata->vif))
1353 break;
1354 ieee80211_mesh_work(sdata);
1355 break;
1356 case NL80211_IFTYPE_OCB:
1357 ieee80211_ocb_work(sdata);
1358 break;
1359 default:
1360 break;
1361 }
1362 }
1363
1364 static void ieee80211_recalc_smps_work(struct work_struct *work)
1365 {
1366 struct ieee80211_sub_if_data *sdata =
1367 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1368
1369 ieee80211_recalc_smps(sdata);
1370 }
1371
1372 /*
1373 * Helper function to initialise an interface to a specific type.
1374 */
1375 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1376 enum nl80211_iftype type)
1377 {
1378 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1379 0xff, 0xff, 0xff};
1380
1381 /* clear type-dependent union */
1382 memset(&sdata->u, 0, sizeof(sdata->u));
1383
1384 /* and set some type-dependent values */
1385 sdata->vif.type = type;
1386 sdata->vif.p2p = false;
1387 sdata->wdev.iftype = type;
1388
1389 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1390 sdata->control_port_no_encrypt = false;
1391 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1392 sdata->vif.bss_conf.idle = true;
1393
1394 sdata->noack_map = 0;
1395
1396 /* only monitor/p2p-device differ */
1397 if (sdata->dev) {
1398 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1399 sdata->dev->type = ARPHRD_ETHER;
1400 }
1401
1402 skb_queue_head_init(&sdata->skb_queue);
1403 INIT_WORK(&sdata->work, ieee80211_iface_work);
1404 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1405 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1406 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1407 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1408
1409 switch (type) {
1410 case NL80211_IFTYPE_P2P_GO:
1411 type = NL80211_IFTYPE_AP;
1412 sdata->vif.type = type;
1413 sdata->vif.p2p = true;
1414 /* fall through */
1415 case NL80211_IFTYPE_AP:
1416 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1417 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1418 INIT_WORK(&sdata->u.ap.request_smps_work,
1419 ieee80211_request_smps_ap_work);
1420 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1421 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1422 break;
1423 case NL80211_IFTYPE_P2P_CLIENT:
1424 type = NL80211_IFTYPE_STATION;
1425 sdata->vif.type = type;
1426 sdata->vif.p2p = true;
1427 /* fall through */
1428 case NL80211_IFTYPE_STATION:
1429 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1430 ieee80211_sta_setup_sdata(sdata);
1431 break;
1432 case NL80211_IFTYPE_OCB:
1433 sdata->vif.bss_conf.bssid = bssid_wildcard;
1434 ieee80211_ocb_setup_sdata(sdata);
1435 break;
1436 case NL80211_IFTYPE_ADHOC:
1437 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1438 ieee80211_ibss_setup_sdata(sdata);
1439 break;
1440 case NL80211_IFTYPE_MESH_POINT:
1441 if (ieee80211_vif_is_mesh(&sdata->vif))
1442 ieee80211_mesh_init_sdata(sdata);
1443 break;
1444 case NL80211_IFTYPE_MONITOR:
1445 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1446 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1447 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1448 MONITOR_FLAG_OTHER_BSS;
1449 break;
1450 case NL80211_IFTYPE_WDS:
1451 sdata->vif.bss_conf.bssid = NULL;
1452 break;
1453 case NL80211_IFTYPE_AP_VLAN:
1454 case NL80211_IFTYPE_P2P_DEVICE:
1455 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1456 break;
1457 case NL80211_IFTYPE_UNSPECIFIED:
1458 case NUM_NL80211_IFTYPES:
1459 BUG();
1460 break;
1461 }
1462
1463 ieee80211_debugfs_add_netdev(sdata);
1464 }
1465
1466 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1467 enum nl80211_iftype type)
1468 {
1469 struct ieee80211_local *local = sdata->local;
1470 int ret, err;
1471 enum nl80211_iftype internal_type = type;
1472 bool p2p = false;
1473
1474 ASSERT_RTNL();
1475
1476 if (!local->ops->change_interface)
1477 return -EBUSY;
1478
1479 switch (sdata->vif.type) {
1480 case NL80211_IFTYPE_AP:
1481 case NL80211_IFTYPE_STATION:
1482 case NL80211_IFTYPE_ADHOC:
1483 case NL80211_IFTYPE_OCB:
1484 /*
1485 * Could maybe also all others here?
1486 * Just not sure how that interacts
1487 * with the RX/config path e.g. for
1488 * mesh.
1489 */
1490 break;
1491 default:
1492 return -EBUSY;
1493 }
1494
1495 switch (type) {
1496 case NL80211_IFTYPE_AP:
1497 case NL80211_IFTYPE_STATION:
1498 case NL80211_IFTYPE_ADHOC:
1499 case NL80211_IFTYPE_OCB:
1500 /*
1501 * Could probably support everything
1502 * but WDS here (WDS do_open can fail
1503 * under memory pressure, which this
1504 * code isn't prepared to handle).
1505 */
1506 break;
1507 case NL80211_IFTYPE_P2P_CLIENT:
1508 p2p = true;
1509 internal_type = NL80211_IFTYPE_STATION;
1510 break;
1511 case NL80211_IFTYPE_P2P_GO:
1512 p2p = true;
1513 internal_type = NL80211_IFTYPE_AP;
1514 break;
1515 default:
1516 return -EBUSY;
1517 }
1518
1519 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1520 if (ret)
1521 return ret;
1522
1523 ieee80211_do_stop(sdata, false);
1524
1525 ieee80211_teardown_sdata(sdata);
1526
1527 ret = drv_change_interface(local, sdata, internal_type, p2p);
1528 if (ret)
1529 type = ieee80211_vif_type_p2p(&sdata->vif);
1530
1531 /*
1532 * Ignore return value here, there's not much we can do since
1533 * the driver changed the interface type internally already.
1534 * The warnings will hopefully make driver authors fix it :-)
1535 */
1536 ieee80211_check_queues(sdata, type);
1537
1538 ieee80211_setup_sdata(sdata, type);
1539
1540 err = ieee80211_do_open(&sdata->wdev, false);
1541 WARN(err, "type change: do_open returned %d", err);
1542
1543 return ret;
1544 }
1545
1546 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1547 enum nl80211_iftype type)
1548 {
1549 int ret;
1550
1551 ASSERT_RTNL();
1552
1553 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1554 return 0;
1555
1556 if (ieee80211_sdata_running(sdata)) {
1557 ret = ieee80211_runtime_change_iftype(sdata, type);
1558 if (ret)
1559 return ret;
1560 } else {
1561 /* Purge and reset type-dependent state. */
1562 ieee80211_teardown_sdata(sdata);
1563 ieee80211_setup_sdata(sdata, type);
1564 }
1565
1566 /* reset some values that shouldn't be kept across type changes */
1567 if (type == NL80211_IFTYPE_STATION)
1568 sdata->u.mgd.use_4addr = false;
1569
1570 return 0;
1571 }
1572
1573 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1574 u8 *perm_addr, enum nl80211_iftype type)
1575 {
1576 struct ieee80211_sub_if_data *sdata;
1577 u64 mask, start, addr, val, inc;
1578 u8 *m;
1579 u8 tmp_addr[ETH_ALEN];
1580 int i;
1581
1582 /* default ... something at least */
1583 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1584
1585 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1586 local->hw.wiphy->n_addresses <= 1)
1587 return;
1588
1589 mutex_lock(&local->iflist_mtx);
1590
1591 switch (type) {
1592 case NL80211_IFTYPE_MONITOR:
1593 /* doesn't matter */
1594 break;
1595 case NL80211_IFTYPE_WDS:
1596 case NL80211_IFTYPE_AP_VLAN:
1597 /* match up with an AP interface */
1598 list_for_each_entry(sdata, &local->interfaces, list) {
1599 if (sdata->vif.type != NL80211_IFTYPE_AP)
1600 continue;
1601 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1602 break;
1603 }
1604 /* keep default if no AP interface present */
1605 break;
1606 case NL80211_IFTYPE_P2P_CLIENT:
1607 case NL80211_IFTYPE_P2P_GO:
1608 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1609 list_for_each_entry(sdata, &local->interfaces, list) {
1610 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1611 continue;
1612 if (!ieee80211_sdata_running(sdata))
1613 continue;
1614 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1615 goto out_unlock;
1616 }
1617 }
1618 /* otherwise fall through */
1619 default:
1620 /* assign a new address if possible -- try n_addresses first */
1621 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1622 bool used = false;
1623
1624 list_for_each_entry(sdata, &local->interfaces, list) {
1625 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1626 sdata->vif.addr)) {
1627 used = true;
1628 break;
1629 }
1630 }
1631
1632 if (!used) {
1633 memcpy(perm_addr,
1634 local->hw.wiphy->addresses[i].addr,
1635 ETH_ALEN);
1636 break;
1637 }
1638 }
1639
1640 /* try mask if available */
1641 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1642 break;
1643
1644 m = local->hw.wiphy->addr_mask;
1645 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1646 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1647 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1648
1649 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1650 /* not a contiguous mask ... not handled now! */
1651 pr_info("not contiguous\n");
1652 break;
1653 }
1654
1655 /*
1656 * Pick address of existing interface in case user changed
1657 * MAC address manually, default to perm_addr.
1658 */
1659 m = local->hw.wiphy->perm_addr;
1660 list_for_each_entry(sdata, &local->interfaces, list) {
1661 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1662 continue;
1663 m = sdata->vif.addr;
1664 break;
1665 }
1666 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1667 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1668 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1669
1670 inc = 1ULL<<__ffs64(mask);
1671 val = (start & mask);
1672 addr = (start & ~mask) | (val & mask);
1673 do {
1674 bool used = false;
1675
1676 tmp_addr[5] = addr >> 0*8;
1677 tmp_addr[4] = addr >> 1*8;
1678 tmp_addr[3] = addr >> 2*8;
1679 tmp_addr[2] = addr >> 3*8;
1680 tmp_addr[1] = addr >> 4*8;
1681 tmp_addr[0] = addr >> 5*8;
1682
1683 val += inc;
1684
1685 list_for_each_entry(sdata, &local->interfaces, list) {
1686 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1687 used = true;
1688 break;
1689 }
1690 }
1691
1692 if (!used) {
1693 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1694 break;
1695 }
1696 addr = (start & ~mask) | (val & mask);
1697 } while (addr != start);
1698
1699 break;
1700 }
1701
1702 out_unlock:
1703 mutex_unlock(&local->iflist_mtx);
1704 }
1705
1706 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1707 unsigned char name_assign_type,
1708 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1709 struct vif_params *params)
1710 {
1711 struct net_device *ndev = NULL;
1712 struct ieee80211_sub_if_data *sdata = NULL;
1713 struct txq_info *txqi;
1714 void (*if_setup)(struct net_device *dev);
1715 int ret, i;
1716 int txqs = 1;
1717
1718 ASSERT_RTNL();
1719
1720 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1721 struct wireless_dev *wdev;
1722
1723 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1724 GFP_KERNEL);
1725 if (!sdata)
1726 return -ENOMEM;
1727 wdev = &sdata->wdev;
1728
1729 sdata->dev = NULL;
1730 strlcpy(sdata->name, name, IFNAMSIZ);
1731 ieee80211_assign_perm_addr(local, wdev->address, type);
1732 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1733 } else {
1734 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1735 sizeof(void *));
1736 int txq_size = 0;
1737
1738 if (local->ops->wake_tx_queue)
1739 txq_size += sizeof(struct txq_info) +
1740 local->hw.txq_data_size;
1741
1742 if (local->ops->wake_tx_queue)
1743 if_setup = ieee80211_if_setup_no_queue;
1744 else
1745 if_setup = ieee80211_if_setup;
1746
1747 if (local->hw.queues >= IEEE80211_NUM_ACS)
1748 txqs = IEEE80211_NUM_ACS;
1749
1750 ndev = alloc_netdev_mqs(size + txq_size,
1751 name, name_assign_type,
1752 if_setup, txqs, 1);
1753 if (!ndev)
1754 return -ENOMEM;
1755 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1756
1757 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1758 if (!ndev->tstats) {
1759 free_netdev(ndev);
1760 return -ENOMEM;
1761 }
1762
1763 ndev->needed_headroom = local->tx_headroom +
1764 4*6 /* four MAC addresses */
1765 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1766 + 6 /* mesh */
1767 + 8 /* rfc1042/bridge tunnel */
1768 - ETH_HLEN /* ethernet hard_header_len */
1769 + IEEE80211_ENCRYPT_HEADROOM;
1770 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1771
1772 ret = dev_alloc_name(ndev, ndev->name);
1773 if (ret < 0) {
1774 ieee80211_if_free(ndev);
1775 return ret;
1776 }
1777
1778 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1779 if (params && is_valid_ether_addr(params->macaddr))
1780 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1781 else
1782 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1783 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1784
1785 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1786 sdata = netdev_priv(ndev);
1787 ndev->ieee80211_ptr = &sdata->wdev;
1788 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1789 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1790
1791 if (txq_size) {
1792 txqi = netdev_priv(ndev) + size;
1793 ieee80211_txq_init(sdata, NULL, txqi, 0);
1794 }
1795
1796 sdata->dev = ndev;
1797 }
1798
1799 /* initialise type-independent data */
1800 sdata->wdev.wiphy = local->hw.wiphy;
1801 sdata->local = local;
1802
1803 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1804 skb_queue_head_init(&sdata->fragments[i].skb_list);
1805
1806 INIT_LIST_HEAD(&sdata->key_list);
1807
1808 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1809 ieee80211_dfs_cac_timer_work);
1810 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1811 ieee80211_delayed_tailroom_dec);
1812
1813 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1814 struct ieee80211_supported_band *sband;
1815 sband = local->hw.wiphy->bands[i];
1816 sdata->rc_rateidx_mask[i] =
1817 sband ? (1 << sband->n_bitrates) - 1 : 0;
1818 if (sband) {
1819 __le16 cap;
1820 u16 *vht_rate_mask;
1821
1822 memcpy(sdata->rc_rateidx_mcs_mask[i],
1823 sband->ht_cap.mcs.rx_mask,
1824 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1825
1826 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1827 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1828 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1829 } else {
1830 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1831 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1832 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1833 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1834 }
1835 }
1836
1837 ieee80211_set_default_queues(sdata);
1838
1839 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1840 sdata->user_power_level = local->user_power_level;
1841
1842 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1843
1844 /* setup type-dependent data */
1845 ieee80211_setup_sdata(sdata, type);
1846
1847 if (ndev) {
1848 if (params) {
1849 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1850 if (type == NL80211_IFTYPE_STATION)
1851 sdata->u.mgd.use_4addr = params->use_4addr;
1852 }
1853
1854 ndev->features |= local->hw.netdev_features;
1855
1856 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1857
1858 ret = register_netdevice(ndev);
1859 if (ret) {
1860 ieee80211_if_free(ndev);
1861 return ret;
1862 }
1863 }
1864
1865 mutex_lock(&local->iflist_mtx);
1866 list_add_tail_rcu(&sdata->list, &local->interfaces);
1867 mutex_unlock(&local->iflist_mtx);
1868
1869 if (new_wdev)
1870 *new_wdev = &sdata->wdev;
1871
1872 return 0;
1873 }
1874
1875 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1876 {
1877 ASSERT_RTNL();
1878
1879 mutex_lock(&sdata->local->iflist_mtx);
1880 list_del_rcu(&sdata->list);
1881 mutex_unlock(&sdata->local->iflist_mtx);
1882
1883 synchronize_rcu();
1884
1885 if (sdata->dev) {
1886 unregister_netdevice(sdata->dev);
1887 } else {
1888 cfg80211_unregister_wdev(&sdata->wdev);
1889 ieee80211_teardown_sdata(sdata);
1890 kfree(sdata);
1891 }
1892 }
1893
1894 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1895 {
1896 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1897 return;
1898 ieee80211_do_stop(sdata, true);
1899 }
1900
1901 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1902 {
1903 struct ieee80211_sub_if_data *sdata, *tmp;
1904 LIST_HEAD(unreg_list);
1905 LIST_HEAD(wdev_list);
1906
1907 ASSERT_RTNL();
1908
1909 /* Before destroying the interfaces, make sure they're all stopped so
1910 * that the hardware is stopped. Otherwise, the driver might still be
1911 * iterating the interfaces during the shutdown, e.g. from a worker
1912 * or from RX processing or similar, and if it does so (using atomic
1913 * iteration) while we're manipulating the list, the iteration will
1914 * crash.
1915 *
1916 * After this, the hardware should be stopped and the driver should
1917 * have stopped all of its activities, so that we can do RCU-unaware
1918 * manipulations of the interface list below.
1919 */
1920 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1921
1922 WARN(local->open_count, "%s: open count remains %d\n",
1923 wiphy_name(local->hw.wiphy), local->open_count);
1924
1925 mutex_lock(&local->iflist_mtx);
1926 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1927 list_del(&sdata->list);
1928
1929 if (sdata->dev)
1930 unregister_netdevice_queue(sdata->dev, &unreg_list);
1931 else
1932 list_add(&sdata->list, &wdev_list);
1933 }
1934 mutex_unlock(&local->iflist_mtx);
1935 unregister_netdevice_many(&unreg_list);
1936
1937 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1938 list_del(&sdata->list);
1939 cfg80211_unregister_wdev(&sdata->wdev);
1940 kfree(sdata);
1941 }
1942 }
1943
1944 static int netdev_notify(struct notifier_block *nb,
1945 unsigned long state, void *ptr)
1946 {
1947 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1948 struct ieee80211_sub_if_data *sdata;
1949
1950 if (state != NETDEV_CHANGENAME)
1951 return NOTIFY_DONE;
1952
1953 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1954 return NOTIFY_DONE;
1955
1956 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1957 return NOTIFY_DONE;
1958
1959 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1960 memcpy(sdata->name, dev->name, IFNAMSIZ);
1961 ieee80211_debugfs_rename_netdev(sdata);
1962
1963 return NOTIFY_OK;
1964 }
1965
1966 static struct notifier_block mac80211_netdev_notifier = {
1967 .notifier_call = netdev_notify,
1968 };
1969
1970 int ieee80211_iface_init(void)
1971 {
1972 return register_netdevice_notifier(&mac80211_netdev_notifier);
1973 }
1974
1975 void ieee80211_iface_exit(void)
1976 {
1977 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1978 }
Linux kernel - Deliverables
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