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Merge remote-tracking branch 'lightnvm/for-next'
[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 static void ieee80211_iface_work(struct work_struct *work);
47
48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
49 {
50 struct ieee80211_chanctx_conf *chanctx_conf;
51 int power;
52
53 rcu_read_lock();
54 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
55 if (!chanctx_conf) {
56 rcu_read_unlock();
57 return false;
58 }
59
60 power = ieee80211_chandef_max_power(&chanctx_conf->def);
61 rcu_read_unlock();
62
63 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->user_power_level);
65
66 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 power = min(power, sdata->ap_power_level);
68
69 if (power != sdata->vif.bss_conf.txpower) {
70 sdata->vif.bss_conf.txpower = power;
71 ieee80211_hw_config(sdata->local, 0);
72 return true;
73 }
74
75 return false;
76 }
77
78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
79 bool update_bss)
80 {
81 if (__ieee80211_recalc_txpower(sdata) ||
82 (update_bss && ieee80211_sdata_running(sdata)))
83 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
84 }
85
86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
87 {
88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
89 return 0;
90
91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
92 return IEEE80211_CONF_CHANGE_IDLE;
93 }
94
95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
96 {
97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
98 return 0;
99
100 ieee80211_flush_queues(local, NULL, false);
101
102 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103 return IEEE80211_CONF_CHANGE_IDLE;
104 }
105
106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107 bool force_active)
108 {
109 bool working, scanning, active;
110 unsigned int led_trig_start = 0, led_trig_stop = 0;
111
112 lockdep_assert_held(&local->mtx);
113
114 active = force_active ||
115 !list_empty(&local->chanctx_list) ||
116 local->monitors;
117
118 working = !local->ops->remain_on_channel &&
119 !list_empty(&local->roc_list);
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156 return -EINVAL;
157
158 dev->mtu = new_mtu;
159 return 0;
160 }
161
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163 bool check_dup)
164 {
165 struct ieee80211_local *local = sdata->local;
166 struct ieee80211_sub_if_data *iter;
167 u64 new, mask, tmp;
168 u8 *m;
169 int ret = 0;
170
171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172 return 0;
173
174 m = addr;
175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178
179 m = local->hw.wiphy->addr_mask;
180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183
184 if (!check_dup)
185 return ret;
186
187 mutex_lock(&local->iflist_mtx);
188 list_for_each_entry(iter, &local->interfaces, list) {
189 if (iter == sdata)
190 continue;
191
192 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
194 continue;
195
196 m = iter->vif.addr;
197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200
201 if ((new & ~mask) != (tmp & ~mask)) {
202 ret = -EINVAL;
203 break;
204 }
205 }
206 mutex_unlock(&local->iflist_mtx);
207
208 return ret;
209 }
210
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214 struct sockaddr *sa = addr;
215 bool check_dup = true;
216 int ret;
217
218 if (ieee80211_sdata_running(sdata))
219 return -EBUSY;
220
221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
223 check_dup = false;
224
225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226 if (ret)
227 return ret;
228
229 ret = eth_mac_addr(dev, sa);
230
231 if (ret == 0)
232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233
234 return ret;
235 }
236
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239 return type1 == NL80211_IFTYPE_MONITOR ||
240 type2 == NL80211_IFTYPE_MONITOR ||
241 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244 (type1 == NL80211_IFTYPE_WDS &&
245 (type2 == NL80211_IFTYPE_WDS ||
246 type2 == NL80211_IFTYPE_AP)) ||
247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248 (type1 == NL80211_IFTYPE_AP_VLAN &&
249 (type2 == NL80211_IFTYPE_AP ||
250 type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254 enum nl80211_iftype iftype)
255 {
256 struct ieee80211_local *local = sdata->local;
257 struct ieee80211_sub_if_data *nsdata;
258 int ret;
259
260 ASSERT_RTNL();
261
262 /* we hold the RTNL here so can safely walk the list */
263 list_for_each_entry(nsdata, &local->interfaces, list) {
264 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
265 /*
266 * Only OCB and monitor mode may coexist
267 */
268 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
269 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
270 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
271 nsdata->vif.type == NL80211_IFTYPE_OCB))
272 return -EBUSY;
273
274 /*
275 * Allow only a single IBSS interface to be up at any
276 * time. This is restricted because beacon distribution
277 * cannot work properly if both are in the same IBSS.
278 *
279 * To remove this restriction we'd have to disallow them
280 * from setting the same SSID on different IBSS interfaces
281 * belonging to the same hardware. Then, however, we're
282 * faced with having to adopt two different TSF timers...
283 */
284 if (iftype == NL80211_IFTYPE_ADHOC &&
285 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
286 return -EBUSY;
287 /*
288 * will not add another interface while any channel
289 * switch is active.
290 */
291 if (nsdata->vif.csa_active)
292 return -EBUSY;
293
294 /*
295 * The remaining checks are only performed for interfaces
296 * with the same MAC address.
297 */
298 if (!ether_addr_equal(sdata->vif.addr,
299 nsdata->vif.addr))
300 continue;
301
302 /*
303 * check whether it may have the same address
304 */
305 if (!identical_mac_addr_allowed(iftype,
306 nsdata->vif.type))
307 return -ENOTUNIQ;
308
309 /*
310 * can only add VLANs to enabled APs
311 */
312 if (iftype == NL80211_IFTYPE_AP_VLAN &&
313 nsdata->vif.type == NL80211_IFTYPE_AP)
314 sdata->bss = &nsdata->u.ap;
315 }
316 }
317
318 mutex_lock(&local->chanctx_mtx);
319 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
320 mutex_unlock(&local->chanctx_mtx);
321 return ret;
322 }
323
324 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
325 enum nl80211_iftype iftype)
326 {
327 int n_queues = sdata->local->hw.queues;
328 int i;
329
330 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
331 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
332 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
333 IEEE80211_INVAL_HW_QUEUE))
334 return -EINVAL;
335 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
336 n_queues))
337 return -EINVAL;
338 }
339 }
340
341 if ((iftype != NL80211_IFTYPE_AP &&
342 iftype != NL80211_IFTYPE_P2P_GO &&
343 iftype != NL80211_IFTYPE_MESH_POINT) ||
344 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
345 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
346 return 0;
347 }
348
349 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
350 return -EINVAL;
351
352 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
353 return -EINVAL;
354
355 return 0;
356 }
357
358 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
359 const int offset)
360 {
361 struct ieee80211_local *local = sdata->local;
362 u32 flags = sdata->u.mntr.flags;
363
364 #define ADJUST(_f, _s) do { \
365 if (flags & MONITOR_FLAG_##_f) \
366 local->fif_##_s += offset; \
367 } while (0)
368
369 ADJUST(FCSFAIL, fcsfail);
370 ADJUST(PLCPFAIL, plcpfail);
371 ADJUST(CONTROL, control);
372 ADJUST(CONTROL, pspoll);
373 ADJUST(OTHER_BSS, other_bss);
374
375 #undef ADJUST
376 }
377
378 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
379 {
380 struct ieee80211_local *local = sdata->local;
381 int i;
382
383 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
384 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
385 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
386 else if (local->hw.queues >= IEEE80211_NUM_ACS)
387 sdata->vif.hw_queue[i] = i;
388 else
389 sdata->vif.hw_queue[i] = 0;
390 }
391 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
392 }
393
394 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
395 {
396 struct ieee80211_sub_if_data *sdata;
397 int ret;
398
399 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
400 return 0;
401
402 ASSERT_RTNL();
403
404 if (local->monitor_sdata)
405 return 0;
406
407 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
408 if (!sdata)
409 return -ENOMEM;
410
411 /* set up data */
412 sdata->local = local;
413 sdata->vif.type = NL80211_IFTYPE_MONITOR;
414 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
415 wiphy_name(local->hw.wiphy));
416 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
417
418 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
419
420 ieee80211_set_default_queues(sdata);
421
422 ret = drv_add_interface(local, sdata);
423 if (WARN_ON(ret)) {
424 /* ok .. stupid driver, it asked for this! */
425 kfree(sdata);
426 return ret;
427 }
428
429 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
430 if (ret) {
431 kfree(sdata);
432 return ret;
433 }
434
435 mutex_lock(&local->iflist_mtx);
436 rcu_assign_pointer(local->monitor_sdata, sdata);
437 mutex_unlock(&local->iflist_mtx);
438
439 mutex_lock(&local->mtx);
440 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
441 IEEE80211_CHANCTX_EXCLUSIVE);
442 mutex_unlock(&local->mtx);
443 if (ret) {
444 mutex_lock(&local->iflist_mtx);
445 RCU_INIT_POINTER(local->monitor_sdata, NULL);
446 mutex_unlock(&local->iflist_mtx);
447 synchronize_net();
448 drv_remove_interface(local, sdata);
449 kfree(sdata);
450 return ret;
451 }
452
453 skb_queue_head_init(&sdata->skb_queue);
454 INIT_WORK(&sdata->work, ieee80211_iface_work);
455
456 return 0;
457 }
458
459 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
460 {
461 struct ieee80211_sub_if_data *sdata;
462
463 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
464 return;
465
466 ASSERT_RTNL();
467
468 mutex_lock(&local->iflist_mtx);
469
470 sdata = rcu_dereference_protected(local->monitor_sdata,
471 lockdep_is_held(&local->iflist_mtx));
472 if (!sdata) {
473 mutex_unlock(&local->iflist_mtx);
474 return;
475 }
476
477 RCU_INIT_POINTER(local->monitor_sdata, NULL);
478 mutex_unlock(&local->iflist_mtx);
479
480 synchronize_net();
481
482 mutex_lock(&local->mtx);
483 ieee80211_vif_release_channel(sdata);
484 mutex_unlock(&local->mtx);
485
486 drv_remove_interface(local, sdata);
487
488 kfree(sdata);
489 }
490
491 /*
492 * NOTE: Be very careful when changing this function, it must NOT return
493 * an error on interface type changes that have been pre-checked, so most
494 * checks should be in ieee80211_check_concurrent_iface.
495 */
496 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
497 {
498 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
499 struct net_device *dev = wdev->netdev;
500 struct ieee80211_local *local = sdata->local;
501 struct sta_info *sta;
502 u32 changed = 0;
503 int res;
504 u32 hw_reconf_flags = 0;
505
506 switch (sdata->vif.type) {
507 case NL80211_IFTYPE_WDS:
508 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
509 return -ENOLINK;
510 break;
511 case NL80211_IFTYPE_AP_VLAN: {
512 struct ieee80211_sub_if_data *master;
513
514 if (!sdata->bss)
515 return -ENOLINK;
516
517 mutex_lock(&local->mtx);
518 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
519 mutex_unlock(&local->mtx);
520
521 master = container_of(sdata->bss,
522 struct ieee80211_sub_if_data, u.ap);
523 sdata->control_port_protocol =
524 master->control_port_protocol;
525 sdata->control_port_no_encrypt =
526 master->control_port_no_encrypt;
527 sdata->vif.cab_queue = master->vif.cab_queue;
528 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
529 sizeof(sdata->vif.hw_queue));
530 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
531
532 mutex_lock(&local->key_mtx);
533 sdata->crypto_tx_tailroom_needed_cnt +=
534 master->crypto_tx_tailroom_needed_cnt;
535 mutex_unlock(&local->key_mtx);
536
537 break;
538 }
539 case NL80211_IFTYPE_AP:
540 sdata->bss = &sdata->u.ap;
541 break;
542 case NL80211_IFTYPE_MESH_POINT:
543 case NL80211_IFTYPE_STATION:
544 case NL80211_IFTYPE_MONITOR:
545 case NL80211_IFTYPE_ADHOC:
546 case NL80211_IFTYPE_P2P_DEVICE:
547 case NL80211_IFTYPE_OCB:
548 /* no special treatment */
549 break;
550 case NL80211_IFTYPE_UNSPECIFIED:
551 case NUM_NL80211_IFTYPES:
552 case NL80211_IFTYPE_P2P_CLIENT:
553 case NL80211_IFTYPE_P2P_GO:
554 /* cannot happen */
555 WARN_ON(1);
556 break;
557 }
558
559 if (local->open_count == 0) {
560 res = drv_start(local);
561 if (res)
562 goto err_del_bss;
563 /* we're brought up, everything changes */
564 hw_reconf_flags = ~0;
565 ieee80211_led_radio(local, true);
566 ieee80211_mod_tpt_led_trig(local,
567 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
568 }
569
570 /*
571 * Copy the hopefully now-present MAC address to
572 * this interface, if it has the special null one.
573 */
574 if (dev && is_zero_ether_addr(dev->dev_addr)) {
575 memcpy(dev->dev_addr,
576 local->hw.wiphy->perm_addr,
577 ETH_ALEN);
578 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
579
580 if (!is_valid_ether_addr(dev->dev_addr)) {
581 res = -EADDRNOTAVAIL;
582 goto err_stop;
583 }
584 }
585
586 switch (sdata->vif.type) {
587 case NL80211_IFTYPE_AP_VLAN:
588 /* no need to tell driver, but set carrier and chanctx */
589 if (rtnl_dereference(sdata->bss->beacon)) {
590 ieee80211_vif_vlan_copy_chanctx(sdata);
591 netif_carrier_on(dev);
592 } else {
593 netif_carrier_off(dev);
594 }
595 break;
596 case NL80211_IFTYPE_MONITOR:
597 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
598 local->cooked_mntrs++;
599 break;
600 }
601
602 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
603 res = drv_add_interface(local, sdata);
604 if (res)
605 goto err_stop;
606 } else if (local->monitors == 0 && local->open_count == 0) {
607 res = ieee80211_add_virtual_monitor(local);
608 if (res)
609 goto err_stop;
610 }
611
612 /* must be before the call to ieee80211_configure_filter */
613 local->monitors++;
614 if (local->monitors == 1) {
615 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
616 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
617 }
618
619 ieee80211_adjust_monitor_flags(sdata, 1);
620 ieee80211_configure_filter(local);
621 mutex_lock(&local->mtx);
622 ieee80211_recalc_idle(local);
623 mutex_unlock(&local->mtx);
624
625 netif_carrier_on(dev);
626 break;
627 default:
628 if (coming_up) {
629 ieee80211_del_virtual_monitor(local);
630
631 res = drv_add_interface(local, sdata);
632 if (res)
633 goto err_stop;
634 res = ieee80211_check_queues(sdata,
635 ieee80211_vif_type_p2p(&sdata->vif));
636 if (res)
637 goto err_del_interface;
638 }
639
640 if (sdata->vif.type == NL80211_IFTYPE_AP) {
641 local->fif_pspoll++;
642 local->fif_probe_req++;
643
644 ieee80211_configure_filter(local);
645 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
646 local->fif_probe_req++;
647 }
648
649 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
650 changed |= ieee80211_reset_erp_info(sdata);
651 ieee80211_bss_info_change_notify(sdata, changed);
652
653 switch (sdata->vif.type) {
654 case NL80211_IFTYPE_STATION:
655 case NL80211_IFTYPE_ADHOC:
656 case NL80211_IFTYPE_AP:
657 case NL80211_IFTYPE_MESH_POINT:
658 case NL80211_IFTYPE_OCB:
659 netif_carrier_off(dev);
660 break;
661 case NL80211_IFTYPE_WDS:
662 case NL80211_IFTYPE_P2P_DEVICE:
663 break;
664 default:
665 /* not reached */
666 WARN_ON(1);
667 }
668
669 /*
670 * Set default queue parameters so drivers don't
671 * need to initialise the hardware if the hardware
672 * doesn't start up with sane defaults.
673 * Enable QoS for anything but station interfaces.
674 */
675 ieee80211_set_wmm_default(sdata, true,
676 sdata->vif.type != NL80211_IFTYPE_STATION);
677 }
678
679 set_bit(SDATA_STATE_RUNNING, &sdata->state);
680
681 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
682 /* Create STA entry for the WDS peer */
683 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
684 GFP_KERNEL);
685 if (!sta) {
686 res = -ENOMEM;
687 goto err_del_interface;
688 }
689
690 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
691 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
692 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
693
694 res = sta_info_insert(sta);
695 if (res) {
696 /* STA has been freed */
697 goto err_del_interface;
698 }
699
700 rate_control_rate_init(sta);
701 netif_carrier_on(dev);
702 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
703 rcu_assign_pointer(local->p2p_sdata, sdata);
704 }
705
706 /*
707 * set_multicast_list will be invoked by the networking core
708 * which will check whether any increments here were done in
709 * error and sync them down to the hardware as filter flags.
710 */
711 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
712 atomic_inc(&local->iff_allmultis);
713
714 if (coming_up)
715 local->open_count++;
716
717 if (hw_reconf_flags)
718 ieee80211_hw_config(local, hw_reconf_flags);
719
720 ieee80211_recalc_ps(local);
721
722 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
723 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
724 /* XXX: for AP_VLAN, actually track AP queues */
725 netif_tx_start_all_queues(dev);
726 } else if (dev) {
727 unsigned long flags;
728 int n_acs = IEEE80211_NUM_ACS;
729 int ac;
730
731 if (local->hw.queues < IEEE80211_NUM_ACS)
732 n_acs = 1;
733
734 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
735 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
736 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
737 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
738 for (ac = 0; ac < n_acs; ac++) {
739 int ac_queue = sdata->vif.hw_queue[ac];
740
741 if (local->queue_stop_reasons[ac_queue] == 0 &&
742 skb_queue_empty(&local->pending[ac_queue]))
743 netif_start_subqueue(dev, ac);
744 }
745 }
746 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
747 }
748
749 return 0;
750 err_del_interface:
751 drv_remove_interface(local, sdata);
752 err_stop:
753 if (!local->open_count)
754 drv_stop(local);
755 err_del_bss:
756 sdata->bss = NULL;
757 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
758 mutex_lock(&local->mtx);
759 list_del(&sdata->u.vlan.list);
760 mutex_unlock(&local->mtx);
761 }
762 /* might already be clear but that doesn't matter */
763 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
764 return res;
765 }
766
767 static int ieee80211_open(struct net_device *dev)
768 {
769 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
770 int err;
771
772 /* fail early if user set an invalid address */
773 if (!is_valid_ether_addr(dev->dev_addr))
774 return -EADDRNOTAVAIL;
775
776 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
777 if (err)
778 return err;
779
780 return ieee80211_do_open(&sdata->wdev, true);
781 }
782
783 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
784 bool going_down)
785 {
786 struct ieee80211_local *local = sdata->local;
787 struct fq *fq = &local->fq;
788 unsigned long flags;
789 struct sk_buff *skb, *tmp;
790 u32 hw_reconf_flags = 0;
791 int i, flushed;
792 struct ps_data *ps;
793 struct cfg80211_chan_def chandef;
794 bool cancel_scan;
795
796 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
797
798 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
799 if (cancel_scan)
800 ieee80211_scan_cancel(local);
801
802 /*
803 * Stop TX on this interface first.
804 */
805 if (sdata->dev)
806 netif_tx_stop_all_queues(sdata->dev);
807
808 ieee80211_roc_purge(local, sdata);
809
810 switch (sdata->vif.type) {
811 case NL80211_IFTYPE_STATION:
812 ieee80211_mgd_stop(sdata);
813 break;
814 case NL80211_IFTYPE_ADHOC:
815 ieee80211_ibss_stop(sdata);
816 break;
817 case NL80211_IFTYPE_AP:
818 cancel_work_sync(&sdata->u.ap.request_smps_work);
819 break;
820 default:
821 break;
822 }
823
824 /*
825 * Remove all stations associated with this interface.
826 *
827 * This must be done before calling ops->remove_interface()
828 * because otherwise we can later invoke ops->sta_notify()
829 * whenever the STAs are removed, and that invalidates driver
830 * assumptions about always getting a vif pointer that is valid
831 * (because if we remove a STA after ops->remove_interface()
832 * the driver will have removed the vif info already!)
833 *
834 * In WDS mode a station must exist here and be flushed, for
835 * AP_VLANs stations may exist since there's nothing else that
836 * would have removed them, but in other modes there shouldn't
837 * be any stations.
838 */
839 flushed = sta_info_flush(sdata);
840 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
841 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
842 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
843
844 /* don't count this interface for allmulti while it is down */
845 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
846 atomic_dec(&local->iff_allmultis);
847
848 if (sdata->vif.type == NL80211_IFTYPE_AP) {
849 local->fif_pspoll--;
850 local->fif_probe_req--;
851 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
852 local->fif_probe_req--;
853 }
854
855 if (sdata->dev) {
856 netif_addr_lock_bh(sdata->dev);
857 spin_lock_bh(&local->filter_lock);
858 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
859 sdata->dev->addr_len);
860 spin_unlock_bh(&local->filter_lock);
861 netif_addr_unlock_bh(sdata->dev);
862 }
863
864 del_timer_sync(&local->dynamic_ps_timer);
865 cancel_work_sync(&local->dynamic_ps_enable_work);
866
867 cancel_work_sync(&sdata->recalc_smps);
868 sdata_lock(sdata);
869 mutex_lock(&local->mtx);
870 sdata->vif.csa_active = false;
871 if (sdata->vif.type == NL80211_IFTYPE_STATION)
872 sdata->u.mgd.csa_waiting_bcn = false;
873 if (sdata->csa_block_tx) {
874 ieee80211_wake_vif_queues(local, sdata,
875 IEEE80211_QUEUE_STOP_REASON_CSA);
876 sdata->csa_block_tx = false;
877 }
878 mutex_unlock(&local->mtx);
879 sdata_unlock(sdata);
880
881 cancel_work_sync(&sdata->csa_finalize_work);
882
883 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
884
885 if (sdata->wdev.cac_started) {
886 chandef = sdata->vif.bss_conf.chandef;
887 WARN_ON(local->suspended);
888 mutex_lock(&local->mtx);
889 ieee80211_vif_release_channel(sdata);
890 mutex_unlock(&local->mtx);
891 cfg80211_cac_event(sdata->dev, &chandef,
892 NL80211_RADAR_CAC_ABORTED,
893 GFP_KERNEL);
894 }
895
896 /* APs need special treatment */
897 if (sdata->vif.type == NL80211_IFTYPE_AP) {
898 struct ieee80211_sub_if_data *vlan, *tmpsdata;
899
900 /* down all dependent devices, that is VLANs */
901 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
902 u.vlan.list)
903 dev_close(vlan->dev);
904 WARN_ON(!list_empty(&sdata->u.ap.vlans));
905 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
906 /* remove all packets in parent bc_buf pointing to this dev */
907 ps = &sdata->bss->ps;
908
909 spin_lock_irqsave(&ps->bc_buf.lock, flags);
910 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
911 if (skb->dev == sdata->dev) {
912 __skb_unlink(skb, &ps->bc_buf);
913 local->total_ps_buffered--;
914 ieee80211_free_txskb(&local->hw, skb);
915 }
916 }
917 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
918 }
919
920 if (going_down)
921 local->open_count--;
922
923 switch (sdata->vif.type) {
924 case NL80211_IFTYPE_AP_VLAN:
925 mutex_lock(&local->mtx);
926 list_del(&sdata->u.vlan.list);
927 mutex_unlock(&local->mtx);
928 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
929 /* see comment in the default case below */
930 ieee80211_free_keys(sdata, true);
931 /* no need to tell driver */
932 break;
933 case NL80211_IFTYPE_MONITOR:
934 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
935 local->cooked_mntrs--;
936 break;
937 }
938
939 local->monitors--;
940 if (local->monitors == 0) {
941 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
942 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
943 }
944
945 ieee80211_adjust_monitor_flags(sdata, -1);
946 break;
947 case NL80211_IFTYPE_P2P_DEVICE:
948 /* relies on synchronize_rcu() below */
949 RCU_INIT_POINTER(local->p2p_sdata, NULL);
950 /* fall through */
951 default:
952 cancel_work_sync(&sdata->work);
953 /*
954 * When we get here, the interface is marked down.
955 * Free the remaining keys, if there are any
956 * (which can happen in AP mode if userspace sets
957 * keys before the interface is operating, and maybe
958 * also in WDS mode)
959 *
960 * Force the key freeing to always synchronize_net()
961 * to wait for the RX path in case it is using this
962 * interface enqueuing frames at this very time on
963 * another CPU.
964 */
965 ieee80211_free_keys(sdata, true);
966 skb_queue_purge(&sdata->skb_queue);
967 }
968
969 sdata->bss = NULL;
970
971 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
972 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
973 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
974 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
975 if (info->control.vif == &sdata->vif) {
976 __skb_unlink(skb, &local->pending[i]);
977 ieee80211_free_txskb(&local->hw, skb);
978 }
979 }
980 }
981 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
982
983 if (sdata->vif.txq) {
984 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
985
986 spin_lock_bh(&fq->lock);
987 ieee80211_txq_purge(local, txqi);
988 spin_unlock_bh(&fq->lock);
989 }
990
991 if (local->open_count == 0)
992 ieee80211_clear_tx_pending(local);
993
994 /*
995 * If the interface goes down while suspended, presumably because
996 * the device was unplugged and that happens before our resume,
997 * then the driver is already unconfigured and the remainder of
998 * this function isn't needed.
999 * XXX: what about WoWLAN? If the device has software state, e.g.
1000 * memory allocated, it might expect teardown commands from
1001 * mac80211 here?
1002 */
1003 if (local->suspended) {
1004 WARN_ON(local->wowlan);
1005 WARN_ON(rtnl_dereference(local->monitor_sdata));
1006 return;
1007 }
1008
1009 switch (sdata->vif.type) {
1010 case NL80211_IFTYPE_AP_VLAN:
1011 break;
1012 case NL80211_IFTYPE_MONITOR:
1013 if (local->monitors == 0)
1014 ieee80211_del_virtual_monitor(local);
1015
1016 mutex_lock(&local->mtx);
1017 ieee80211_recalc_idle(local);
1018 mutex_unlock(&local->mtx);
1019
1020 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1021 break;
1022
1023 /* fall through */
1024 default:
1025 if (going_down)
1026 drv_remove_interface(local, sdata);
1027 }
1028
1029 ieee80211_recalc_ps(local);
1030
1031 if (cancel_scan)
1032 flush_delayed_work(&local->scan_work);
1033
1034 if (local->open_count == 0) {
1035 ieee80211_stop_device(local);
1036
1037 /* no reconfiguring after stop! */
1038 return;
1039 }
1040
1041 /* do after stop to avoid reconfiguring when we stop anyway */
1042 ieee80211_configure_filter(local);
1043 ieee80211_hw_config(local, hw_reconf_flags);
1044
1045 if (local->monitors == local->open_count)
1046 ieee80211_add_virtual_monitor(local);
1047 }
1048
1049 static int ieee80211_stop(struct net_device *dev)
1050 {
1051 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1052
1053 ieee80211_do_stop(sdata, true);
1054
1055 return 0;
1056 }
1057
1058 static void ieee80211_set_multicast_list(struct net_device *dev)
1059 {
1060 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1061 struct ieee80211_local *local = sdata->local;
1062 int allmulti, sdata_allmulti;
1063
1064 allmulti = !!(dev->flags & IFF_ALLMULTI);
1065 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1066
1067 if (allmulti != sdata_allmulti) {
1068 if (dev->flags & IFF_ALLMULTI)
1069 atomic_inc(&local->iff_allmultis);
1070 else
1071 atomic_dec(&local->iff_allmultis);
1072 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1073 }
1074
1075 spin_lock_bh(&local->filter_lock);
1076 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1077 spin_unlock_bh(&local->filter_lock);
1078 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1079 }
1080
1081 /*
1082 * Called when the netdev is removed or, by the code below, before
1083 * the interface type changes.
1084 */
1085 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1086 {
1087 int i;
1088
1089 /* free extra data */
1090 ieee80211_free_keys(sdata, false);
1091
1092 ieee80211_debugfs_remove_netdev(sdata);
1093
1094 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1095 __skb_queue_purge(&sdata->fragments[i].skb_list);
1096 sdata->fragment_next = 0;
1097
1098 if (ieee80211_vif_is_mesh(&sdata->vif))
1099 ieee80211_mesh_teardown_sdata(sdata);
1100 }
1101
1102 static void ieee80211_uninit(struct net_device *dev)
1103 {
1104 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1105 }
1106
1107 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1108 struct sk_buff *skb,
1109 void *accel_priv,
1110 select_queue_fallback_t fallback)
1111 {
1112 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1113 }
1114
1115 static struct rtnl_link_stats64 *
1116 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1117 {
1118 int i;
1119
1120 for_each_possible_cpu(i) {
1121 const struct pcpu_sw_netstats *tstats;
1122 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1123 unsigned int start;
1124
1125 tstats = per_cpu_ptr(dev->tstats, i);
1126
1127 do {
1128 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1129 rx_packets = tstats->rx_packets;
1130 tx_packets = tstats->tx_packets;
1131 rx_bytes = tstats->rx_bytes;
1132 tx_bytes = tstats->tx_bytes;
1133 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1134
1135 stats->rx_packets += rx_packets;
1136 stats->tx_packets += tx_packets;
1137 stats->rx_bytes += rx_bytes;
1138 stats->tx_bytes += tx_bytes;
1139 }
1140
1141 return stats;
1142 }
1143
1144 static const struct net_device_ops ieee80211_dataif_ops = {
1145 .ndo_open = ieee80211_open,
1146 .ndo_stop = ieee80211_stop,
1147 .ndo_uninit = ieee80211_uninit,
1148 .ndo_start_xmit = ieee80211_subif_start_xmit,
1149 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1150 .ndo_change_mtu = ieee80211_change_mtu,
1151 .ndo_set_mac_address = ieee80211_change_mac,
1152 .ndo_select_queue = ieee80211_netdev_select_queue,
1153 .ndo_get_stats64 = ieee80211_get_stats64,
1154 };
1155
1156 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1157 struct sk_buff *skb,
1158 void *accel_priv,
1159 select_queue_fallback_t fallback)
1160 {
1161 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1162 struct ieee80211_local *local = sdata->local;
1163 struct ieee80211_hdr *hdr;
1164 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1165
1166 if (local->hw.queues < IEEE80211_NUM_ACS)
1167 return 0;
1168
1169 if (skb->len < 4 ||
1170 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1171 return 0; /* doesn't matter, frame will be dropped */
1172
1173 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1174
1175 return ieee80211_select_queue_80211(sdata, skb, hdr);
1176 }
1177
1178 static const struct net_device_ops ieee80211_monitorif_ops = {
1179 .ndo_open = ieee80211_open,
1180 .ndo_stop = ieee80211_stop,
1181 .ndo_uninit = ieee80211_uninit,
1182 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1183 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1184 .ndo_change_mtu = ieee80211_change_mtu,
1185 .ndo_set_mac_address = ieee80211_change_mac,
1186 .ndo_select_queue = ieee80211_monitor_select_queue,
1187 .ndo_get_stats64 = ieee80211_get_stats64,
1188 };
1189
1190 static void ieee80211_if_free(struct net_device *dev)
1191 {
1192 free_percpu(dev->tstats);
1193 free_netdev(dev);
1194 }
1195
1196 static void ieee80211_if_setup(struct net_device *dev)
1197 {
1198 ether_setup(dev);
1199 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1200 dev->netdev_ops = &ieee80211_dataif_ops;
1201 dev->destructor = ieee80211_if_free;
1202 }
1203
1204 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1205 {
1206 ieee80211_if_setup(dev);
1207 dev->priv_flags |= IFF_NO_QUEUE;
1208 }
1209
1210 static void ieee80211_iface_work(struct work_struct *work)
1211 {
1212 struct ieee80211_sub_if_data *sdata =
1213 container_of(work, struct ieee80211_sub_if_data, work);
1214 struct ieee80211_local *local = sdata->local;
1215 struct sk_buff *skb;
1216 struct sta_info *sta;
1217 struct ieee80211_ra_tid *ra_tid;
1218 struct ieee80211_rx_agg *rx_agg;
1219
1220 if (!ieee80211_sdata_running(sdata))
1221 return;
1222
1223 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1224 return;
1225
1226 if (!ieee80211_can_run_worker(local))
1227 return;
1228
1229 /* first process frames */
1230 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1231 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1232
1233 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1234 ra_tid = (void *)&skb->cb;
1235 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1236 ra_tid->tid);
1237 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1238 ra_tid = (void *)&skb->cb;
1239 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1240 ra_tid->tid);
1241 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1242 rx_agg = (void *)&skb->cb;
1243 mutex_lock(&local->sta_mtx);
1244 sta = sta_info_get_bss(sdata, rx_agg->addr);
1245 if (sta)
1246 __ieee80211_start_rx_ba_session(sta,
1247 0, 0, 0, 1, rx_agg->tid,
1248 IEEE80211_MAX_AMPDU_BUF,
1249 false, true);
1250 mutex_unlock(&local->sta_mtx);
1251 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1252 rx_agg = (void *)&skb->cb;
1253 mutex_lock(&local->sta_mtx);
1254 sta = sta_info_get_bss(sdata, rx_agg->addr);
1255 if (sta)
1256 __ieee80211_stop_rx_ba_session(sta,
1257 rx_agg->tid,
1258 WLAN_BACK_RECIPIENT, 0,
1259 false);
1260 mutex_unlock(&local->sta_mtx);
1261 } else if (ieee80211_is_action(mgmt->frame_control) &&
1262 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1263 int len = skb->len;
1264
1265 mutex_lock(&local->sta_mtx);
1266 sta = sta_info_get_bss(sdata, mgmt->sa);
1267 if (sta) {
1268 switch (mgmt->u.action.u.addba_req.action_code) {
1269 case WLAN_ACTION_ADDBA_REQ:
1270 ieee80211_process_addba_request(
1271 local, sta, mgmt, len);
1272 break;
1273 case WLAN_ACTION_ADDBA_RESP:
1274 ieee80211_process_addba_resp(local, sta,
1275 mgmt, len);
1276 break;
1277 case WLAN_ACTION_DELBA:
1278 ieee80211_process_delba(sdata, sta,
1279 mgmt, len);
1280 break;
1281 default:
1282 WARN_ON(1);
1283 break;
1284 }
1285 }
1286 mutex_unlock(&local->sta_mtx);
1287 } else if (ieee80211_is_action(mgmt->frame_control) &&
1288 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1289 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1290 case WLAN_VHT_ACTION_GROUPID_MGMT:
1291 ieee80211_process_mu_groups(sdata, mgmt);
1292 break;
1293 default:
1294 WARN_ON(1);
1295 break;
1296 }
1297 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1298 struct ieee80211_hdr *hdr = (void *)mgmt;
1299 /*
1300 * So the frame isn't mgmt, but frame_control
1301 * is at the right place anyway, of course, so
1302 * the if statement is correct.
1303 *
1304 * Warn if we have other data frame types here,
1305 * they must not get here.
1306 */
1307 WARN_ON(hdr->frame_control &
1308 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1309 WARN_ON(!(hdr->seq_ctrl &
1310 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1311 /*
1312 * This was a fragment of a frame, received while
1313 * a block-ack session was active. That cannot be
1314 * right, so terminate the session.
1315 */
1316 mutex_lock(&local->sta_mtx);
1317 sta = sta_info_get_bss(sdata, mgmt->sa);
1318 if (sta) {
1319 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1320 IEEE80211_QOS_CTL_TID_MASK;
1321
1322 __ieee80211_stop_rx_ba_session(
1323 sta, tid, WLAN_BACK_RECIPIENT,
1324 WLAN_REASON_QSTA_REQUIRE_SETUP,
1325 true);
1326 }
1327 mutex_unlock(&local->sta_mtx);
1328 } else switch (sdata->vif.type) {
1329 case NL80211_IFTYPE_STATION:
1330 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1331 break;
1332 case NL80211_IFTYPE_ADHOC:
1333 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1334 break;
1335 case NL80211_IFTYPE_MESH_POINT:
1336 if (!ieee80211_vif_is_mesh(&sdata->vif))
1337 break;
1338 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1339 break;
1340 default:
1341 WARN(1, "frame for unexpected interface type");
1342 break;
1343 }
1344
1345 kfree_skb(skb);
1346 }
1347
1348 /* then other type-dependent work */
1349 switch (sdata->vif.type) {
1350 case NL80211_IFTYPE_STATION:
1351 ieee80211_sta_work(sdata);
1352 break;
1353 case NL80211_IFTYPE_ADHOC:
1354 ieee80211_ibss_work(sdata);
1355 break;
1356 case NL80211_IFTYPE_MESH_POINT:
1357 if (!ieee80211_vif_is_mesh(&sdata->vif))
1358 break;
1359 ieee80211_mesh_work(sdata);
1360 break;
1361 case NL80211_IFTYPE_OCB:
1362 ieee80211_ocb_work(sdata);
1363 break;
1364 default:
1365 break;
1366 }
1367 }
1368
1369 static void ieee80211_recalc_smps_work(struct work_struct *work)
1370 {
1371 struct ieee80211_sub_if_data *sdata =
1372 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1373
1374 ieee80211_recalc_smps(sdata);
1375 }
1376
1377 /*
1378 * Helper function to initialise an interface to a specific type.
1379 */
1380 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1381 enum nl80211_iftype type)
1382 {
1383 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1384 0xff, 0xff, 0xff};
1385
1386 /* clear type-dependent union */
1387 memset(&sdata->u, 0, sizeof(sdata->u));
1388
1389 /* and set some type-dependent values */
1390 sdata->vif.type = type;
1391 sdata->vif.p2p = false;
1392 sdata->wdev.iftype = type;
1393
1394 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1395 sdata->control_port_no_encrypt = false;
1396 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1397 sdata->vif.bss_conf.idle = true;
1398
1399 sdata->noack_map = 0;
1400
1401 /* only monitor/p2p-device differ */
1402 if (sdata->dev) {
1403 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1404 sdata->dev->type = ARPHRD_ETHER;
1405 }
1406
1407 skb_queue_head_init(&sdata->skb_queue);
1408 INIT_WORK(&sdata->work, ieee80211_iface_work);
1409 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1410 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1411 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1412 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1413
1414 switch (type) {
1415 case NL80211_IFTYPE_P2P_GO:
1416 type = NL80211_IFTYPE_AP;
1417 sdata->vif.type = type;
1418 sdata->vif.p2p = true;
1419 /* fall through */
1420 case NL80211_IFTYPE_AP:
1421 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1422 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1423 INIT_WORK(&sdata->u.ap.request_smps_work,
1424 ieee80211_request_smps_ap_work);
1425 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1426 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1427 break;
1428 case NL80211_IFTYPE_P2P_CLIENT:
1429 type = NL80211_IFTYPE_STATION;
1430 sdata->vif.type = type;
1431 sdata->vif.p2p = true;
1432 /* fall through */
1433 case NL80211_IFTYPE_STATION:
1434 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1435 ieee80211_sta_setup_sdata(sdata);
1436 break;
1437 case NL80211_IFTYPE_OCB:
1438 sdata->vif.bss_conf.bssid = bssid_wildcard;
1439 ieee80211_ocb_setup_sdata(sdata);
1440 break;
1441 case NL80211_IFTYPE_ADHOC:
1442 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1443 ieee80211_ibss_setup_sdata(sdata);
1444 break;
1445 case NL80211_IFTYPE_MESH_POINT:
1446 if (ieee80211_vif_is_mesh(&sdata->vif))
1447 ieee80211_mesh_init_sdata(sdata);
1448 break;
1449 case NL80211_IFTYPE_MONITOR:
1450 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1451 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1452 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1453 MONITOR_FLAG_OTHER_BSS;
1454 break;
1455 case NL80211_IFTYPE_WDS:
1456 sdata->vif.bss_conf.bssid = NULL;
1457 break;
1458 case NL80211_IFTYPE_AP_VLAN:
1459 case NL80211_IFTYPE_P2P_DEVICE:
1460 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1461 break;
1462 case NL80211_IFTYPE_UNSPECIFIED:
1463 case NUM_NL80211_IFTYPES:
1464 BUG();
1465 break;
1466 }
1467
1468 ieee80211_debugfs_add_netdev(sdata);
1469 }
1470
1471 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1472 enum nl80211_iftype type)
1473 {
1474 struct ieee80211_local *local = sdata->local;
1475 int ret, err;
1476 enum nl80211_iftype internal_type = type;
1477 bool p2p = false;
1478
1479 ASSERT_RTNL();
1480
1481 if (!local->ops->change_interface)
1482 return -EBUSY;
1483
1484 switch (sdata->vif.type) {
1485 case NL80211_IFTYPE_AP:
1486 case NL80211_IFTYPE_STATION:
1487 case NL80211_IFTYPE_ADHOC:
1488 case NL80211_IFTYPE_OCB:
1489 /*
1490 * Could maybe also all others here?
1491 * Just not sure how that interacts
1492 * with the RX/config path e.g. for
1493 * mesh.
1494 */
1495 break;
1496 default:
1497 return -EBUSY;
1498 }
1499
1500 switch (type) {
1501 case NL80211_IFTYPE_AP:
1502 case NL80211_IFTYPE_STATION:
1503 case NL80211_IFTYPE_ADHOC:
1504 case NL80211_IFTYPE_OCB:
1505 /*
1506 * Could probably support everything
1507 * but WDS here (WDS do_open can fail
1508 * under memory pressure, which this
1509 * code isn't prepared to handle).
1510 */
1511 break;
1512 case NL80211_IFTYPE_P2P_CLIENT:
1513 p2p = true;
1514 internal_type = NL80211_IFTYPE_STATION;
1515 break;
1516 case NL80211_IFTYPE_P2P_GO:
1517 p2p = true;
1518 internal_type = NL80211_IFTYPE_AP;
1519 break;
1520 default:
1521 return -EBUSY;
1522 }
1523
1524 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1525 if (ret)
1526 return ret;
1527
1528 ieee80211_do_stop(sdata, false);
1529
1530 ieee80211_teardown_sdata(sdata);
1531
1532 ret = drv_change_interface(local, sdata, internal_type, p2p);
1533 if (ret)
1534 type = ieee80211_vif_type_p2p(&sdata->vif);
1535
1536 /*
1537 * Ignore return value here, there's not much we can do since
1538 * the driver changed the interface type internally already.
1539 * The warnings will hopefully make driver authors fix it :-)
1540 */
1541 ieee80211_check_queues(sdata, type);
1542
1543 ieee80211_setup_sdata(sdata, type);
1544
1545 err = ieee80211_do_open(&sdata->wdev, false);
1546 WARN(err, "type change: do_open returned %d", err);
1547
1548 return ret;
1549 }
1550
1551 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1552 enum nl80211_iftype type)
1553 {
1554 int ret;
1555
1556 ASSERT_RTNL();
1557
1558 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1559 return 0;
1560
1561 if (ieee80211_sdata_running(sdata)) {
1562 ret = ieee80211_runtime_change_iftype(sdata, type);
1563 if (ret)
1564 return ret;
1565 } else {
1566 /* Purge and reset type-dependent state. */
1567 ieee80211_teardown_sdata(sdata);
1568 ieee80211_setup_sdata(sdata, type);
1569 }
1570
1571 /* reset some values that shouldn't be kept across type changes */
1572 if (type == NL80211_IFTYPE_STATION)
1573 sdata->u.mgd.use_4addr = false;
1574
1575 return 0;
1576 }
1577
1578 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1579 u8 *perm_addr, enum nl80211_iftype type)
1580 {
1581 struct ieee80211_sub_if_data *sdata;
1582 u64 mask, start, addr, val, inc;
1583 u8 *m;
1584 u8 tmp_addr[ETH_ALEN];
1585 int i;
1586
1587 /* default ... something at least */
1588 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1589
1590 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1591 local->hw.wiphy->n_addresses <= 1)
1592 return;
1593
1594 mutex_lock(&local->iflist_mtx);
1595
1596 switch (type) {
1597 case NL80211_IFTYPE_MONITOR:
1598 /* doesn't matter */
1599 break;
1600 case NL80211_IFTYPE_WDS:
1601 case NL80211_IFTYPE_AP_VLAN:
1602 /* match up with an AP interface */
1603 list_for_each_entry(sdata, &local->interfaces, list) {
1604 if (sdata->vif.type != NL80211_IFTYPE_AP)
1605 continue;
1606 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1607 break;
1608 }
1609 /* keep default if no AP interface present */
1610 break;
1611 case NL80211_IFTYPE_P2P_CLIENT:
1612 case NL80211_IFTYPE_P2P_GO:
1613 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1614 list_for_each_entry(sdata, &local->interfaces, list) {
1615 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1616 continue;
1617 if (!ieee80211_sdata_running(sdata))
1618 continue;
1619 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1620 goto out_unlock;
1621 }
1622 }
1623 /* otherwise fall through */
1624 default:
1625 /* assign a new address if possible -- try n_addresses first */
1626 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1627 bool used = false;
1628
1629 list_for_each_entry(sdata, &local->interfaces, list) {
1630 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1631 sdata->vif.addr)) {
1632 used = true;
1633 break;
1634 }
1635 }
1636
1637 if (!used) {
1638 memcpy(perm_addr,
1639 local->hw.wiphy->addresses[i].addr,
1640 ETH_ALEN);
1641 break;
1642 }
1643 }
1644
1645 /* try mask if available */
1646 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1647 break;
1648
1649 m = local->hw.wiphy->addr_mask;
1650 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1651 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1652 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1653
1654 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1655 /* not a contiguous mask ... not handled now! */
1656 pr_info("not contiguous\n");
1657 break;
1658 }
1659
1660 /*
1661 * Pick address of existing interface in case user changed
1662 * MAC address manually, default to perm_addr.
1663 */
1664 m = local->hw.wiphy->perm_addr;
1665 list_for_each_entry(sdata, &local->interfaces, list) {
1666 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1667 continue;
1668 m = sdata->vif.addr;
1669 break;
1670 }
1671 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1672 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1673 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1674
1675 inc = 1ULL<<__ffs64(mask);
1676 val = (start & mask);
1677 addr = (start & ~mask) | (val & mask);
1678 do {
1679 bool used = false;
1680
1681 tmp_addr[5] = addr >> 0*8;
1682 tmp_addr[4] = addr >> 1*8;
1683 tmp_addr[3] = addr >> 2*8;
1684 tmp_addr[2] = addr >> 3*8;
1685 tmp_addr[1] = addr >> 4*8;
1686 tmp_addr[0] = addr >> 5*8;
1687
1688 val += inc;
1689
1690 list_for_each_entry(sdata, &local->interfaces, list) {
1691 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1692 used = true;
1693 break;
1694 }
1695 }
1696
1697 if (!used) {
1698 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1699 break;
1700 }
1701 addr = (start & ~mask) | (val & mask);
1702 } while (addr != start);
1703
1704 break;
1705 }
1706
1707 out_unlock:
1708 mutex_unlock(&local->iflist_mtx);
1709 }
1710
1711 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1712 unsigned char name_assign_type,
1713 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1714 struct vif_params *params)
1715 {
1716 struct net_device *ndev = NULL;
1717 struct ieee80211_sub_if_data *sdata = NULL;
1718 struct txq_info *txqi;
1719 void (*if_setup)(struct net_device *dev);
1720 int ret, i;
1721 int txqs = 1;
1722
1723 ASSERT_RTNL();
1724
1725 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1726 struct wireless_dev *wdev;
1727
1728 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1729 GFP_KERNEL);
1730 if (!sdata)
1731 return -ENOMEM;
1732 wdev = &sdata->wdev;
1733
1734 sdata->dev = NULL;
1735 strlcpy(sdata->name, name, IFNAMSIZ);
1736 ieee80211_assign_perm_addr(local, wdev->address, type);
1737 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1738 } else {
1739 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1740 sizeof(void *));
1741 int txq_size = 0;
1742
1743 if (local->ops->wake_tx_queue)
1744 txq_size += sizeof(struct txq_info) +
1745 local->hw.txq_data_size;
1746
1747 if (local->ops->wake_tx_queue)
1748 if_setup = ieee80211_if_setup_no_queue;
1749 else
1750 if_setup = ieee80211_if_setup;
1751
1752 if (local->hw.queues >= IEEE80211_NUM_ACS)
1753 txqs = IEEE80211_NUM_ACS;
1754
1755 ndev = alloc_netdev_mqs(size + txq_size,
1756 name, name_assign_type,
1757 if_setup, txqs, 1);
1758 if (!ndev)
1759 return -ENOMEM;
1760 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1761
1762 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1763 if (!ndev->tstats) {
1764 free_netdev(ndev);
1765 return -ENOMEM;
1766 }
1767
1768 ndev->needed_headroom = local->tx_headroom +
1769 4*6 /* four MAC addresses */
1770 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1771 + 6 /* mesh */
1772 + 8 /* rfc1042/bridge tunnel */
1773 - ETH_HLEN /* ethernet hard_header_len */
1774 + IEEE80211_ENCRYPT_HEADROOM;
1775 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1776
1777 ret = dev_alloc_name(ndev, ndev->name);
1778 if (ret < 0) {
1779 ieee80211_if_free(ndev);
1780 return ret;
1781 }
1782
1783 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1784 if (params && is_valid_ether_addr(params->macaddr))
1785 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1786 else
1787 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1788 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1789
1790 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1791 sdata = netdev_priv(ndev);
1792 ndev->ieee80211_ptr = &sdata->wdev;
1793 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1794 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1795
1796 if (txq_size) {
1797 txqi = netdev_priv(ndev) + size;
1798 ieee80211_txq_init(sdata, NULL, txqi, 0);
1799 }
1800
1801 sdata->dev = ndev;
1802 }
1803
1804 /* initialise type-independent data */
1805 sdata->wdev.wiphy = local->hw.wiphy;
1806 sdata->local = local;
1807
1808 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1809 skb_queue_head_init(&sdata->fragments[i].skb_list);
1810
1811 INIT_LIST_HEAD(&sdata->key_list);
1812
1813 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1814 ieee80211_dfs_cac_timer_work);
1815 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1816 ieee80211_delayed_tailroom_dec);
1817
1818 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1819 struct ieee80211_supported_band *sband;
1820 sband = local->hw.wiphy->bands[i];
1821 sdata->rc_rateidx_mask[i] =
1822 sband ? (1 << sband->n_bitrates) - 1 : 0;
1823 if (sband) {
1824 __le16 cap;
1825 u16 *vht_rate_mask;
1826
1827 memcpy(sdata->rc_rateidx_mcs_mask[i],
1828 sband->ht_cap.mcs.rx_mask,
1829 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1830
1831 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1832 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1833 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1834 } else {
1835 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1836 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1837 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1838 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1839 }
1840 }
1841
1842 ieee80211_set_default_queues(sdata);
1843
1844 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1845 sdata->user_power_level = local->user_power_level;
1846
1847 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1848
1849 /* setup type-dependent data */
1850 ieee80211_setup_sdata(sdata, type);
1851
1852 if (ndev) {
1853 if (params) {
1854 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1855 if (type == NL80211_IFTYPE_STATION)
1856 sdata->u.mgd.use_4addr = params->use_4addr;
1857 }
1858
1859 ndev->features |= local->hw.netdev_features;
1860
1861 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1862
1863 ret = register_netdevice(ndev);
1864 if (ret) {
1865 ieee80211_if_free(ndev);
1866 return ret;
1867 }
1868 }
1869
1870 mutex_lock(&local->iflist_mtx);
1871 list_add_tail_rcu(&sdata->list, &local->interfaces);
1872 mutex_unlock(&local->iflist_mtx);
1873
1874 if (new_wdev)
1875 *new_wdev = &sdata->wdev;
1876
1877 return 0;
1878 }
1879
1880 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1881 {
1882 ASSERT_RTNL();
1883
1884 mutex_lock(&sdata->local->iflist_mtx);
1885 list_del_rcu(&sdata->list);
1886 mutex_unlock(&sdata->local->iflist_mtx);
1887
1888 synchronize_rcu();
1889
1890 if (sdata->dev) {
1891 unregister_netdevice(sdata->dev);
1892 } else {
1893 cfg80211_unregister_wdev(&sdata->wdev);
1894 ieee80211_teardown_sdata(sdata);
1895 kfree(sdata);
1896 }
1897 }
1898
1899 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1900 {
1901 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1902 return;
1903 ieee80211_do_stop(sdata, true);
1904 }
1905
1906 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1907 {
1908 struct ieee80211_sub_if_data *sdata, *tmp;
1909 LIST_HEAD(unreg_list);
1910 LIST_HEAD(wdev_list);
1911
1912 ASSERT_RTNL();
1913
1914 /* Before destroying the interfaces, make sure they're all stopped so
1915 * that the hardware is stopped. Otherwise, the driver might still be
1916 * iterating the interfaces during the shutdown, e.g. from a worker
1917 * or from RX processing or similar, and if it does so (using atomic
1918 * iteration) while we're manipulating the list, the iteration will
1919 * crash.
1920 *
1921 * After this, the hardware should be stopped and the driver should
1922 * have stopped all of its activities, so that we can do RCU-unaware
1923 * manipulations of the interface list below.
1924 */
1925 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1926
1927 WARN(local->open_count, "%s: open count remains %d\n",
1928 wiphy_name(local->hw.wiphy), local->open_count);
1929
1930 mutex_lock(&local->iflist_mtx);
1931 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1932 list_del(&sdata->list);
1933
1934 if (sdata->dev)
1935 unregister_netdevice_queue(sdata->dev, &unreg_list);
1936 else
1937 list_add(&sdata->list, &wdev_list);
1938 }
1939 mutex_unlock(&local->iflist_mtx);
1940 unregister_netdevice_many(&unreg_list);
1941
1942 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1943 list_del(&sdata->list);
1944 cfg80211_unregister_wdev(&sdata->wdev);
1945 kfree(sdata);
1946 }
1947 }
1948
1949 static int netdev_notify(struct notifier_block *nb,
1950 unsigned long state, void *ptr)
1951 {
1952 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1953 struct ieee80211_sub_if_data *sdata;
1954
1955 if (state != NETDEV_CHANGENAME)
1956 return NOTIFY_DONE;
1957
1958 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1959 return NOTIFY_DONE;
1960
1961 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1962 return NOTIFY_DONE;
1963
1964 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1965 memcpy(sdata->name, dev->name, IFNAMSIZ);
1966 ieee80211_debugfs_rename_netdev(sdata);
1967
1968 return NOTIFY_OK;
1969 }
1970
1971 static struct notifier_block mac80211_netdev_notifier = {
1972 .notifier_call = netdev_notify,
1973 };
1974
1975 int ieee80211_iface_init(void)
1976 {
1977 return register_netdevice_notifier(&mac80211_netdev_notifier);
1978 }
1979
1980 void ieee80211_iface_exit(void)
1981 {
1982 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1983 }
Linux kernel - Deliverables
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