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[linux/fpc-iii.git] / net / mac80211 / iface.c
blob638ec0759078c18ec6816bb9de5abe6f6cb40487
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_NAN)
331 return 0;
332
333 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
334 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
335 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
336 IEEE80211_INVAL_HW_QUEUE))
337 return -EINVAL;
338 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
339 n_queues))
340 return -EINVAL;
341 }
342 }
343
344 if ((iftype != NL80211_IFTYPE_AP &&
345 iftype != NL80211_IFTYPE_P2P_GO &&
346 iftype != NL80211_IFTYPE_MESH_POINT) ||
347 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
348 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
349 return 0;
350 }
351
352 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
353 return -EINVAL;
354
355 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
356 return -EINVAL;
357
358 return 0;
359 }
360
361 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
362 const int offset)
363 {
364 struct ieee80211_local *local = sdata->local;
365 u32 flags = sdata->u.mntr.flags;
366
367 #define ADJUST(_f, _s) do { \
368 if (flags & MONITOR_FLAG_##_f) \
369 local->fif_##_s += offset; \
370 } while (0)
371
372 ADJUST(FCSFAIL, fcsfail);
373 ADJUST(PLCPFAIL, plcpfail);
374 ADJUST(CONTROL, control);
375 ADJUST(CONTROL, pspoll);
376 ADJUST(OTHER_BSS, other_bss);
377
378 #undef ADJUST
379 }
380
381 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
382 {
383 struct ieee80211_local *local = sdata->local;
384 int i;
385
386 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
387 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
388 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
389 else if (local->hw.queues >= IEEE80211_NUM_ACS)
390 sdata->vif.hw_queue[i] = i;
391 else
392 sdata->vif.hw_queue[i] = 0;
393 }
394 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
395 }
396
397 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
398 {
399 struct ieee80211_sub_if_data *sdata;
400 int ret;
401
402 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
403 return 0;
404
405 ASSERT_RTNL();
406
407 if (local->monitor_sdata)
408 return 0;
409
410 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
411 if (!sdata)
412 return -ENOMEM;
413
414 /* set up data */
415 sdata->local = local;
416 sdata->vif.type = NL80211_IFTYPE_MONITOR;
417 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
418 wiphy_name(local->hw.wiphy));
419 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
420
421 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
422
423 ieee80211_set_default_queues(sdata);
424
425 ret = drv_add_interface(local, sdata);
426 if (WARN_ON(ret)) {
427 /* ok .. stupid driver, it asked for this! */
428 kfree(sdata);
429 return ret;
430 }
431
432 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
433 if (ret) {
434 kfree(sdata);
435 return ret;
436 }
437
438 mutex_lock(&local->iflist_mtx);
439 rcu_assign_pointer(local->monitor_sdata, sdata);
440 mutex_unlock(&local->iflist_mtx);
441
442 mutex_lock(&local->mtx);
443 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
444 IEEE80211_CHANCTX_EXCLUSIVE);
445 mutex_unlock(&local->mtx);
446 if (ret) {
447 mutex_lock(&local->iflist_mtx);
448 RCU_INIT_POINTER(local->monitor_sdata, NULL);
449 mutex_unlock(&local->iflist_mtx);
450 synchronize_net();
451 drv_remove_interface(local, sdata);
452 kfree(sdata);
453 return ret;
454 }
455
456 skb_queue_head_init(&sdata->skb_queue);
457 INIT_WORK(&sdata->work, ieee80211_iface_work);
458
459 return 0;
460 }
461
462 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
463 {
464 struct ieee80211_sub_if_data *sdata;
465
466 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
467 return;
468
469 ASSERT_RTNL();
470
471 mutex_lock(&local->iflist_mtx);
472
473 sdata = rcu_dereference_protected(local->monitor_sdata,
474 lockdep_is_held(&local->iflist_mtx));
475 if (!sdata) {
476 mutex_unlock(&local->iflist_mtx);
477 return;
478 }
479
480 RCU_INIT_POINTER(local->monitor_sdata, NULL);
481 mutex_unlock(&local->iflist_mtx);
482
483 synchronize_net();
484
485 mutex_lock(&local->mtx);
486 ieee80211_vif_release_channel(sdata);
487 mutex_unlock(&local->mtx);
488
489 drv_remove_interface(local, sdata);
490
491 kfree(sdata);
492 }
493
494 /*
495 * NOTE: Be very careful when changing this function, it must NOT return
496 * an error on interface type changes that have been pre-checked, so most
497 * checks should be in ieee80211_check_concurrent_iface.
498 */
499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
500 {
501 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
502 struct net_device *dev = wdev->netdev;
503 struct ieee80211_local *local = sdata->local;
504 struct sta_info *sta;
505 u32 changed = 0;
506 int res;
507 u32 hw_reconf_flags = 0;
508
509 switch (sdata->vif.type) {
510 case NL80211_IFTYPE_WDS:
511 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
512 return -ENOLINK;
513 break;
514 case NL80211_IFTYPE_AP_VLAN: {
515 struct ieee80211_sub_if_data *master;
516
517 if (!sdata->bss)
518 return -ENOLINK;
519
520 mutex_lock(&local->mtx);
521 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
522 mutex_unlock(&local->mtx);
523
524 master = container_of(sdata->bss,
525 struct ieee80211_sub_if_data, u.ap);
526 sdata->control_port_protocol =
527 master->control_port_protocol;
528 sdata->control_port_no_encrypt =
529 master->control_port_no_encrypt;
530 sdata->vif.cab_queue = master->vif.cab_queue;
531 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
532 sizeof(sdata->vif.hw_queue));
533 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
534
535 mutex_lock(&local->key_mtx);
536 sdata->crypto_tx_tailroom_needed_cnt +=
537 master->crypto_tx_tailroom_needed_cnt;
538 mutex_unlock(&local->key_mtx);
539
540 break;
541 }
542 case NL80211_IFTYPE_AP:
543 sdata->bss = &sdata->u.ap;
544 break;
545 case NL80211_IFTYPE_MESH_POINT:
546 case NL80211_IFTYPE_STATION:
547 case NL80211_IFTYPE_MONITOR:
548 case NL80211_IFTYPE_ADHOC:
549 case NL80211_IFTYPE_P2P_DEVICE:
550 case NL80211_IFTYPE_OCB:
551 case NL80211_IFTYPE_NAN:
552 /* no special treatment */
553 break;
554 case NL80211_IFTYPE_UNSPECIFIED:
555 case NUM_NL80211_IFTYPES:
556 case NL80211_IFTYPE_P2P_CLIENT:
557 case NL80211_IFTYPE_P2P_GO:
558 /* cannot happen */
559 WARN_ON(1);
560 break;
561 }
562
563 if (local->open_count == 0) {
564 res = drv_start(local);
565 if (res)
566 goto err_del_bss;
567 /* we're brought up, everything changes */
568 hw_reconf_flags = ~0;
569 ieee80211_led_radio(local, true);
570 ieee80211_mod_tpt_led_trig(local,
571 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
572 }
573
574 /*
575 * Copy the hopefully now-present MAC address to
576 * this interface, if it has the special null one.
577 */
578 if (dev && is_zero_ether_addr(dev->dev_addr)) {
579 memcpy(dev->dev_addr,
580 local->hw.wiphy->perm_addr,
581 ETH_ALEN);
582 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
583
584 if (!is_valid_ether_addr(dev->dev_addr)) {
585 res = -EADDRNOTAVAIL;
586 goto err_stop;
587 }
588 }
589
590 switch (sdata->vif.type) {
591 case NL80211_IFTYPE_AP_VLAN:
592 /* no need to tell driver, but set carrier and chanctx */
593 if (rtnl_dereference(sdata->bss->beacon)) {
594 ieee80211_vif_vlan_copy_chanctx(sdata);
595 netif_carrier_on(dev);
596 } else {
597 netif_carrier_off(dev);
598 }
599 break;
600 case NL80211_IFTYPE_MONITOR:
601 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
602 local->cooked_mntrs++;
603 break;
604 }
605
606 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
607 res = drv_add_interface(local, sdata);
608 if (res)
609 goto err_stop;
610 } else if (local->monitors == 0 && local->open_count == 0) {
611 res = ieee80211_add_virtual_monitor(local);
612 if (res)
613 goto err_stop;
614 }
615
616 /* must be before the call to ieee80211_configure_filter */
617 local->monitors++;
618 if (local->monitors == 1) {
619 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
620 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
621 }
622
623 ieee80211_adjust_monitor_flags(sdata, 1);
624 ieee80211_configure_filter(local);
625 mutex_lock(&local->mtx);
626 ieee80211_recalc_idle(local);
627 mutex_unlock(&local->mtx);
628
629 netif_carrier_on(dev);
630 break;
631 default:
632 if (coming_up) {
633 ieee80211_del_virtual_monitor(local);
634
635 res = drv_add_interface(local, sdata);
636 if (res)
637 goto err_stop;
638 res = ieee80211_check_queues(sdata,
639 ieee80211_vif_type_p2p(&sdata->vif));
640 if (res)
641 goto err_del_interface;
642 }
643
644 if (sdata->vif.type == NL80211_IFTYPE_AP) {
645 local->fif_pspoll++;
646 local->fif_probe_req++;
647
648 ieee80211_configure_filter(local);
649 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
650 local->fif_probe_req++;
651 }
652
653 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
654 sdata->vif.type != NL80211_IFTYPE_NAN)
655 changed |= ieee80211_reset_erp_info(sdata);
656 ieee80211_bss_info_change_notify(sdata, changed);
657
658 switch (sdata->vif.type) {
659 case NL80211_IFTYPE_STATION:
660 case NL80211_IFTYPE_ADHOC:
661 case NL80211_IFTYPE_AP:
662 case NL80211_IFTYPE_MESH_POINT:
663 case NL80211_IFTYPE_OCB:
664 netif_carrier_off(dev);
665 break;
666 case NL80211_IFTYPE_WDS:
667 case NL80211_IFTYPE_P2P_DEVICE:
668 case NL80211_IFTYPE_NAN:
669 break;
670 default:
671 /* not reached */
672 WARN_ON(1);
673 }
674
675 /*
676 * Set default queue parameters so drivers don't
677 * need to initialise the hardware if the hardware
678 * doesn't start up with sane defaults.
679 * Enable QoS for anything but station interfaces.
680 */
681 ieee80211_set_wmm_default(sdata, true,
682 sdata->vif.type != NL80211_IFTYPE_STATION);
683 }
684
685 set_bit(SDATA_STATE_RUNNING, &sdata->state);
686
687 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
688 /* Create STA entry for the WDS peer */
689 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
690 GFP_KERNEL);
691 if (!sta) {
692 res = -ENOMEM;
693 goto err_del_interface;
694 }
695
696 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
697 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
698 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
699
700 res = sta_info_insert(sta);
701 if (res) {
702 /* STA has been freed */
703 goto err_del_interface;
704 }
705
706 rate_control_rate_init(sta);
707 netif_carrier_on(dev);
708 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
709 rcu_assign_pointer(local->p2p_sdata, sdata);
710 }
711
712 /*
713 * set_multicast_list will be invoked by the networking core
714 * which will check whether any increments here were done in
715 * error and sync them down to the hardware as filter flags.
716 */
717 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
718 atomic_inc(&local->iff_allmultis);
719
720 if (coming_up)
721 local->open_count++;
722
723 if (hw_reconf_flags)
724 ieee80211_hw_config(local, hw_reconf_flags);
725
726 ieee80211_recalc_ps(local);
727
728 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
729 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
730 /* XXX: for AP_VLAN, actually track AP queues */
731 netif_tx_start_all_queues(dev);
732 } else if (dev) {
733 unsigned long flags;
734 int n_acs = IEEE80211_NUM_ACS;
735 int ac;
736
737 if (local->hw.queues < IEEE80211_NUM_ACS)
738 n_acs = 1;
739
740 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
741 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
742 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
743 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
744 for (ac = 0; ac < n_acs; ac++) {
745 int ac_queue = sdata->vif.hw_queue[ac];
746
747 if (local->queue_stop_reasons[ac_queue] == 0 &&
748 skb_queue_empty(&local->pending[ac_queue]))
749 netif_start_subqueue(dev, ac);
750 }
751 }
752 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
753 }
754
755 return 0;
756 err_del_interface:
757 drv_remove_interface(local, sdata);
758 err_stop:
759 if (!local->open_count)
760 drv_stop(local);
761 err_del_bss:
762 sdata->bss = NULL;
763 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
764 mutex_lock(&local->mtx);
765 list_del(&sdata->u.vlan.list);
766 mutex_unlock(&local->mtx);
767 }
768 /* might already be clear but that doesn't matter */
769 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
770 return res;
771 }
772
773 static int ieee80211_open(struct net_device *dev)
774 {
775 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
776 int err;
777
778 /* fail early if user set an invalid address */
779 if (!is_valid_ether_addr(dev->dev_addr))
780 return -EADDRNOTAVAIL;
781
782 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
783 if (err)
784 return err;
785
786 return ieee80211_do_open(&sdata->wdev, true);
787 }
788
789 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
790 bool going_down)
791 {
792 struct ieee80211_local *local = sdata->local;
793 struct fq *fq = &local->fq;
794 unsigned long flags;
795 struct sk_buff *skb, *tmp;
796 u32 hw_reconf_flags = 0;
797 int i, flushed;
798 struct ps_data *ps;
799 struct cfg80211_chan_def chandef;
800 bool cancel_scan;
801 struct cfg80211_nan_func *func;
802
803 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
804
805 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
806 if (cancel_scan)
807 ieee80211_scan_cancel(local);
808
809 /*
810 * Stop TX on this interface first.
811 */
812 if (sdata->dev)
813 netif_tx_stop_all_queues(sdata->dev);
814
815 ieee80211_roc_purge(local, sdata);
816
817 switch (sdata->vif.type) {
818 case NL80211_IFTYPE_STATION:
819 ieee80211_mgd_stop(sdata);
820 break;
821 case NL80211_IFTYPE_ADHOC:
822 ieee80211_ibss_stop(sdata);
823 break;
824 case NL80211_IFTYPE_AP:
825 cancel_work_sync(&sdata->u.ap.request_smps_work);
826 break;
827 default:
828 break;
829 }
830
831 /*
832 * Remove all stations associated with this interface.
833 *
834 * This must be done before calling ops->remove_interface()
835 * because otherwise we can later invoke ops->sta_notify()
836 * whenever the STAs are removed, and that invalidates driver
837 * assumptions about always getting a vif pointer that is valid
838 * (because if we remove a STA after ops->remove_interface()
839 * the driver will have removed the vif info already!)
840 *
841 * In WDS mode a station must exist here and be flushed, for
842 * AP_VLANs stations may exist since there's nothing else that
843 * would have removed them, but in other modes there shouldn't
844 * be any stations.
845 */
846 flushed = sta_info_flush(sdata);
847 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
848 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
849 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
850
851 /* don't count this interface for allmulti while it is down */
852 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
853 atomic_dec(&local->iff_allmultis);
854
855 if (sdata->vif.type == NL80211_IFTYPE_AP) {
856 local->fif_pspoll--;
857 local->fif_probe_req--;
858 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
859 local->fif_probe_req--;
860 }
861
862 if (sdata->dev) {
863 netif_addr_lock_bh(sdata->dev);
864 spin_lock_bh(&local->filter_lock);
865 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
866 sdata->dev->addr_len);
867 spin_unlock_bh(&local->filter_lock);
868 netif_addr_unlock_bh(sdata->dev);
869 }
870
871 del_timer_sync(&local->dynamic_ps_timer);
872 cancel_work_sync(&local->dynamic_ps_enable_work);
873
874 cancel_work_sync(&sdata->recalc_smps);
875 sdata_lock(sdata);
876 mutex_lock(&local->mtx);
877 sdata->vif.csa_active = false;
878 if (sdata->vif.type == NL80211_IFTYPE_STATION)
879 sdata->u.mgd.csa_waiting_bcn = false;
880 if (sdata->csa_block_tx) {
881 ieee80211_wake_vif_queues(local, sdata,
882 IEEE80211_QUEUE_STOP_REASON_CSA);
883 sdata->csa_block_tx = false;
884 }
885 mutex_unlock(&local->mtx);
886 sdata_unlock(sdata);
887
888 cancel_work_sync(&sdata->csa_finalize_work);
889
890 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
891
892 if (sdata->wdev.cac_started) {
893 chandef = sdata->vif.bss_conf.chandef;
894 WARN_ON(local->suspended);
895 mutex_lock(&local->mtx);
896 ieee80211_vif_release_channel(sdata);
897 mutex_unlock(&local->mtx);
898 cfg80211_cac_event(sdata->dev, &chandef,
899 NL80211_RADAR_CAC_ABORTED,
900 GFP_KERNEL);
901 }
902
903 /* APs need special treatment */
904 if (sdata->vif.type == NL80211_IFTYPE_AP) {
905 struct ieee80211_sub_if_data *vlan, *tmpsdata;
906
907 /* down all dependent devices, that is VLANs */
908 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
909 u.vlan.list)
910 dev_close(vlan->dev);
911 WARN_ON(!list_empty(&sdata->u.ap.vlans));
912 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
913 /* remove all packets in parent bc_buf pointing to this dev */
914 ps = &sdata->bss->ps;
915
916 spin_lock_irqsave(&ps->bc_buf.lock, flags);
917 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
918 if (skb->dev == sdata->dev) {
919 __skb_unlink(skb, &ps->bc_buf);
920 local->total_ps_buffered--;
921 ieee80211_free_txskb(&local->hw, skb);
922 }
923 }
924 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
925 }
926
927 if (going_down)
928 local->open_count--;
929
930 switch (sdata->vif.type) {
931 case NL80211_IFTYPE_AP_VLAN:
932 mutex_lock(&local->mtx);
933 list_del(&sdata->u.vlan.list);
934 mutex_unlock(&local->mtx);
935 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
936 /* see comment in the default case below */
937 ieee80211_free_keys(sdata, true);
938 /* no need to tell driver */
939 break;
940 case NL80211_IFTYPE_MONITOR:
941 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
942 local->cooked_mntrs--;
943 break;
944 }
945
946 local->monitors--;
947 if (local->monitors == 0) {
948 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
949 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
950 }
951
952 ieee80211_adjust_monitor_flags(sdata, -1);
953 break;
954 case NL80211_IFTYPE_NAN:
955 /* clean all the functions */
956 spin_lock_bh(&sdata->u.nan.func_lock);
957
958 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
959 idr_remove(&sdata->u.nan.function_inst_ids, i);
960 cfg80211_free_nan_func(func);
961 }
962 idr_destroy(&sdata->u.nan.function_inst_ids);
963
964 spin_unlock_bh(&sdata->u.nan.func_lock);
965 break;
966 case NL80211_IFTYPE_P2P_DEVICE:
967 /* relies on synchronize_rcu() below */
968 RCU_INIT_POINTER(local->p2p_sdata, NULL);
969 /* fall through */
970 default:
971 cancel_work_sync(&sdata->work);
972 /*
973 * When we get here, the interface is marked down.
974 * Free the remaining keys, if there are any
975 * (which can happen in AP mode if userspace sets
976 * keys before the interface is operating, and maybe
977 * also in WDS mode)
978 *
979 * Force the key freeing to always synchronize_net()
980 * to wait for the RX path in case it is using this
981 * interface enqueuing frames at this very time on
982 * another CPU.
983 */
984 ieee80211_free_keys(sdata, true);
985 skb_queue_purge(&sdata->skb_queue);
986 }
987
988 sdata->bss = NULL;
989
990 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
991 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
992 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
993 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
994 if (info->control.vif == &sdata->vif) {
995 __skb_unlink(skb, &local->pending[i]);
996 ieee80211_free_txskb(&local->hw, skb);
997 }
998 }
999 }
1000 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1001
1002 if (sdata->vif.txq) {
1003 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
1004
1005 spin_lock_bh(&fq->lock);
1006 ieee80211_txq_purge(local, txqi);
1007 spin_unlock_bh(&fq->lock);
1008 }
1009
1010 if (local->open_count == 0)
1011 ieee80211_clear_tx_pending(local);
1012
1013 /*
1014 * If the interface goes down while suspended, presumably because
1015 * the device was unplugged and that happens before our resume,
1016 * then the driver is already unconfigured and the remainder of
1017 * this function isn't needed.
1018 * XXX: what about WoWLAN? If the device has software state, e.g.
1019 * memory allocated, it might expect teardown commands from
1020 * mac80211 here?
1021 */
1022 if (local->suspended) {
1023 WARN_ON(local->wowlan);
1024 WARN_ON(rtnl_dereference(local->monitor_sdata));
1025 return;
1026 }
1027
1028 switch (sdata->vif.type) {
1029 case NL80211_IFTYPE_AP_VLAN:
1030 break;
1031 case NL80211_IFTYPE_MONITOR:
1032 if (local->monitors == 0)
1033 ieee80211_del_virtual_monitor(local);
1034
1035 mutex_lock(&local->mtx);
1036 ieee80211_recalc_idle(local);
1037 mutex_unlock(&local->mtx);
1038
1039 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1040 break;
1041
1042 /* fall through */
1043 default:
1044 if (going_down)
1045 drv_remove_interface(local, sdata);
1046 }
1047
1048 ieee80211_recalc_ps(local);
1049
1050 if (cancel_scan)
1051 flush_delayed_work(&local->scan_work);
1052
1053 if (local->open_count == 0) {
1054 ieee80211_stop_device(local);
1055
1056 /* no reconfiguring after stop! */
1057 return;
1058 }
1059
1060 /* do after stop to avoid reconfiguring when we stop anyway */
1061 ieee80211_configure_filter(local);
1062 ieee80211_hw_config(local, hw_reconf_flags);
1063
1064 if (local->monitors == local->open_count)
1065 ieee80211_add_virtual_monitor(local);
1066 }
1067
1068 static int ieee80211_stop(struct net_device *dev)
1069 {
1070 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071
1072 ieee80211_do_stop(sdata, true);
1073
1074 return 0;
1075 }
1076
1077 static void ieee80211_set_multicast_list(struct net_device *dev)
1078 {
1079 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080 struct ieee80211_local *local = sdata->local;
1081 int allmulti, sdata_allmulti;
1082
1083 allmulti = !!(dev->flags & IFF_ALLMULTI);
1084 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1085
1086 if (allmulti != sdata_allmulti) {
1087 if (dev->flags & IFF_ALLMULTI)
1088 atomic_inc(&local->iff_allmultis);
1089 else
1090 atomic_dec(&local->iff_allmultis);
1091 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1092 }
1093
1094 spin_lock_bh(&local->filter_lock);
1095 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1096 spin_unlock_bh(&local->filter_lock);
1097 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1098 }
1099
1100 /*
1101 * Called when the netdev is removed or, by the code below, before
1102 * the interface type changes.
1103 */
1104 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1105 {
1106 int i;
1107
1108 /* free extra data */
1109 ieee80211_free_keys(sdata, false);
1110
1111 ieee80211_debugfs_remove_netdev(sdata);
1112
1113 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1114 __skb_queue_purge(&sdata->fragments[i].skb_list);
1115 sdata->fragment_next = 0;
1116
1117 if (ieee80211_vif_is_mesh(&sdata->vif))
1118 ieee80211_mesh_teardown_sdata(sdata);
1119 }
1120
1121 static void ieee80211_uninit(struct net_device *dev)
1122 {
1123 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1124 }
1125
1126 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1127 struct sk_buff *skb,
1128 void *accel_priv,
1129 select_queue_fallback_t fallback)
1130 {
1131 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1132 }
1133
1134 static struct rtnl_link_stats64 *
1135 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1136 {
1137 int i;
1138
1139 for_each_possible_cpu(i) {
1140 const struct pcpu_sw_netstats *tstats;
1141 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1142 unsigned int start;
1143
1144 tstats = per_cpu_ptr(dev->tstats, i);
1145
1146 do {
1147 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1148 rx_packets = tstats->rx_packets;
1149 tx_packets = tstats->tx_packets;
1150 rx_bytes = tstats->rx_bytes;
1151 tx_bytes = tstats->tx_bytes;
1152 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1153
1154 stats->rx_packets += rx_packets;
1155 stats->tx_packets += tx_packets;
1156 stats->rx_bytes += rx_bytes;
1157 stats->tx_bytes += tx_bytes;
1158 }
1159
1160 return stats;
1161 }
1162
1163 static const struct net_device_ops ieee80211_dataif_ops = {
1164 .ndo_open = ieee80211_open,
1165 .ndo_stop = ieee80211_stop,
1166 .ndo_uninit = ieee80211_uninit,
1167 .ndo_start_xmit = ieee80211_subif_start_xmit,
1168 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1169 .ndo_change_mtu = ieee80211_change_mtu,
1170 .ndo_set_mac_address = ieee80211_change_mac,
1171 .ndo_select_queue = ieee80211_netdev_select_queue,
1172 .ndo_get_stats64 = ieee80211_get_stats64,
1173 };
1174
1175 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1176 struct sk_buff *skb,
1177 void *accel_priv,
1178 select_queue_fallback_t fallback)
1179 {
1180 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181 struct ieee80211_local *local = sdata->local;
1182 struct ieee80211_hdr *hdr;
1183 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1184
1185 if (local->hw.queues < IEEE80211_NUM_ACS)
1186 return 0;
1187
1188 if (skb->len < 4 ||
1189 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1190 return 0; /* doesn't matter, frame will be dropped */
1191
1192 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1193
1194 return ieee80211_select_queue_80211(sdata, skb, hdr);
1195 }
1196
1197 static const struct net_device_ops ieee80211_monitorif_ops = {
1198 .ndo_open = ieee80211_open,
1199 .ndo_stop = ieee80211_stop,
1200 .ndo_uninit = ieee80211_uninit,
1201 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1202 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1203 .ndo_change_mtu = ieee80211_change_mtu,
1204 .ndo_set_mac_address = ieee80211_change_mac,
1205 .ndo_select_queue = ieee80211_monitor_select_queue,
1206 .ndo_get_stats64 = ieee80211_get_stats64,
1207 };
1208
1209 static void ieee80211_if_free(struct net_device *dev)
1210 {
1211 free_percpu(dev->tstats);
1212 free_netdev(dev);
1213 }
1214
1215 static void ieee80211_if_setup(struct net_device *dev)
1216 {
1217 ether_setup(dev);
1218 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1219 dev->netdev_ops = &ieee80211_dataif_ops;
1220 dev->destructor = ieee80211_if_free;
1221 }
1222
1223 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1224 {
1225 ieee80211_if_setup(dev);
1226 dev->priv_flags |= IFF_NO_QUEUE;
1227 }
1228
1229 static void ieee80211_iface_work(struct work_struct *work)
1230 {
1231 struct ieee80211_sub_if_data *sdata =
1232 container_of(work, struct ieee80211_sub_if_data, work);
1233 struct ieee80211_local *local = sdata->local;
1234 struct sk_buff *skb;
1235 struct sta_info *sta;
1236 struct ieee80211_ra_tid *ra_tid;
1237 struct ieee80211_rx_agg *rx_agg;
1238
1239 if (!ieee80211_sdata_running(sdata))
1240 return;
1241
1242 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1243 return;
1244
1245 if (!ieee80211_can_run_worker(local))
1246 return;
1247
1248 /* first process frames */
1249 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1250 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1251
1252 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1253 ra_tid = (void *)&skb->cb;
1254 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1255 ra_tid->tid);
1256 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1257 ra_tid = (void *)&skb->cb;
1258 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1259 ra_tid->tid);
1260 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1261 rx_agg = (void *)&skb->cb;
1262 mutex_lock(&local->sta_mtx);
1263 sta = sta_info_get_bss(sdata, rx_agg->addr);
1264 if (sta)
1265 __ieee80211_start_rx_ba_session(sta,
1266 0, 0, 0, 1, rx_agg->tid,
1267 IEEE80211_MAX_AMPDU_BUF,
1268 false, true);
1269 mutex_unlock(&local->sta_mtx);
1270 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1271 rx_agg = (void *)&skb->cb;
1272 mutex_lock(&local->sta_mtx);
1273 sta = sta_info_get_bss(sdata, rx_agg->addr);
1274 if (sta)
1275 __ieee80211_stop_rx_ba_session(sta,
1276 rx_agg->tid,
1277 WLAN_BACK_RECIPIENT, 0,
1278 false);
1279 mutex_unlock(&local->sta_mtx);
1280 } else if (ieee80211_is_action(mgmt->frame_control) &&
1281 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1282 int len = skb->len;
1283
1284 mutex_lock(&local->sta_mtx);
1285 sta = sta_info_get_bss(sdata, mgmt->sa);
1286 if (sta) {
1287 switch (mgmt->u.action.u.addba_req.action_code) {
1288 case WLAN_ACTION_ADDBA_REQ:
1289 ieee80211_process_addba_request(
1290 local, sta, mgmt, len);
1291 break;
1292 case WLAN_ACTION_ADDBA_RESP:
1293 ieee80211_process_addba_resp(local, sta,
1294 mgmt, len);
1295 break;
1296 case WLAN_ACTION_DELBA:
1297 ieee80211_process_delba(sdata, sta,
1298 mgmt, len);
1299 break;
1300 default:
1301 WARN_ON(1);
1302 break;
1303 }
1304 }
1305 mutex_unlock(&local->sta_mtx);
1306 } else if (ieee80211_is_action(mgmt->frame_control) &&
1307 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1308 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1309 case WLAN_VHT_ACTION_GROUPID_MGMT:
1310 ieee80211_process_mu_groups(sdata, mgmt);
1311 break;
1312 default:
1313 WARN_ON(1);
1314 break;
1315 }
1316 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1317 struct ieee80211_hdr *hdr = (void *)mgmt;
1318 /*
1319 * So the frame isn't mgmt, but frame_control
1320 * is at the right place anyway, of course, so
1321 * the if statement is correct.
1322 *
1323 * Warn if we have other data frame types here,
1324 * they must not get here.
1325 */
1326 WARN_ON(hdr->frame_control &
1327 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1328 WARN_ON(!(hdr->seq_ctrl &
1329 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1330 /*
1331 * This was a fragment of a frame, received while
1332 * a block-ack session was active. That cannot be
1333 * right, so terminate the session.
1334 */
1335 mutex_lock(&local->sta_mtx);
1336 sta = sta_info_get_bss(sdata, mgmt->sa);
1337 if (sta) {
1338 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1339 IEEE80211_QOS_CTL_TID_MASK;
1340
1341 __ieee80211_stop_rx_ba_session(
1342 sta, tid, WLAN_BACK_RECIPIENT,
1343 WLAN_REASON_QSTA_REQUIRE_SETUP,
1344 true);
1345 }
1346 mutex_unlock(&local->sta_mtx);
1347 } else switch (sdata->vif.type) {
1348 case NL80211_IFTYPE_STATION:
1349 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1350 break;
1351 case NL80211_IFTYPE_ADHOC:
1352 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1353 break;
1354 case NL80211_IFTYPE_MESH_POINT:
1355 if (!ieee80211_vif_is_mesh(&sdata->vif))
1356 break;
1357 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1358 break;
1359 default:
1360 WARN(1, "frame for unexpected interface type");
1361 break;
1362 }
1363
1364 kfree_skb(skb);
1365 }
1366
1367 /* then other type-dependent work */
1368 switch (sdata->vif.type) {
1369 case NL80211_IFTYPE_STATION:
1370 ieee80211_sta_work(sdata);
1371 break;
1372 case NL80211_IFTYPE_ADHOC:
1373 ieee80211_ibss_work(sdata);
1374 break;
1375 case NL80211_IFTYPE_MESH_POINT:
1376 if (!ieee80211_vif_is_mesh(&sdata->vif))
1377 break;
1378 ieee80211_mesh_work(sdata);
1379 break;
1380 case NL80211_IFTYPE_OCB:
1381 ieee80211_ocb_work(sdata);
1382 break;
1383 default:
1384 break;
1385 }
1386 }
1387
1388 static void ieee80211_recalc_smps_work(struct work_struct *work)
1389 {
1390 struct ieee80211_sub_if_data *sdata =
1391 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1392
1393 ieee80211_recalc_smps(sdata);
1394 }
1395
1396 /*
1397 * Helper function to initialise an interface to a specific type.
1398 */
1399 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1400 enum nl80211_iftype type)
1401 {
1402 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1403 0xff, 0xff, 0xff};
1404
1405 /* clear type-dependent union */
1406 memset(&sdata->u, 0, sizeof(sdata->u));
1407
1408 /* and set some type-dependent values */
1409 sdata->vif.type = type;
1410 sdata->vif.p2p = false;
1411 sdata->wdev.iftype = type;
1412
1413 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1414 sdata->control_port_no_encrypt = false;
1415 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1416 sdata->vif.bss_conf.idle = true;
1417
1418 sdata->noack_map = 0;
1419
1420 /* only monitor/p2p-device differ */
1421 if (sdata->dev) {
1422 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1423 sdata->dev->type = ARPHRD_ETHER;
1424 }
1425
1426 skb_queue_head_init(&sdata->skb_queue);
1427 INIT_WORK(&sdata->work, ieee80211_iface_work);
1428 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1429 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1430 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1431 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1432
1433 switch (type) {
1434 case NL80211_IFTYPE_P2P_GO:
1435 type = NL80211_IFTYPE_AP;
1436 sdata->vif.type = type;
1437 sdata->vif.p2p = true;
1438 /* fall through */
1439 case NL80211_IFTYPE_AP:
1440 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1441 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1442 INIT_WORK(&sdata->u.ap.request_smps_work,
1443 ieee80211_request_smps_ap_work);
1444 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1445 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1446 break;
1447 case NL80211_IFTYPE_P2P_CLIENT:
1448 type = NL80211_IFTYPE_STATION;
1449 sdata->vif.type = type;
1450 sdata->vif.p2p = true;
1451 /* fall through */
1452 case NL80211_IFTYPE_STATION:
1453 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1454 ieee80211_sta_setup_sdata(sdata);
1455 break;
1456 case NL80211_IFTYPE_OCB:
1457 sdata->vif.bss_conf.bssid = bssid_wildcard;
1458 ieee80211_ocb_setup_sdata(sdata);
1459 break;
1460 case NL80211_IFTYPE_ADHOC:
1461 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1462 ieee80211_ibss_setup_sdata(sdata);
1463 break;
1464 case NL80211_IFTYPE_MESH_POINT:
1465 if (ieee80211_vif_is_mesh(&sdata->vif))
1466 ieee80211_mesh_init_sdata(sdata);
1467 break;
1468 case NL80211_IFTYPE_MONITOR:
1469 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1470 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1471 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1472 MONITOR_FLAG_OTHER_BSS;
1473 break;
1474 case NL80211_IFTYPE_WDS:
1475 sdata->vif.bss_conf.bssid = NULL;
1476 break;
1477 case NL80211_IFTYPE_NAN:
1478 idr_init(&sdata->u.nan.function_inst_ids);
1479 spin_lock_init(&sdata->u.nan.func_lock);
1480 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1481 break;
1482 case NL80211_IFTYPE_AP_VLAN:
1483 case NL80211_IFTYPE_P2P_DEVICE:
1484 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1485 break;
1486 case NL80211_IFTYPE_UNSPECIFIED:
1487 case NUM_NL80211_IFTYPES:
1488 BUG();
1489 break;
1490 }
1491
1492 ieee80211_debugfs_add_netdev(sdata);
1493 }
1494
1495 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1496 enum nl80211_iftype type)
1497 {
1498 struct ieee80211_local *local = sdata->local;
1499 int ret, err;
1500 enum nl80211_iftype internal_type = type;
1501 bool p2p = false;
1502
1503 ASSERT_RTNL();
1504
1505 if (!local->ops->change_interface)
1506 return -EBUSY;
1507
1508 switch (sdata->vif.type) {
1509 case NL80211_IFTYPE_AP:
1510 case NL80211_IFTYPE_STATION:
1511 case NL80211_IFTYPE_ADHOC:
1512 case NL80211_IFTYPE_OCB:
1513 /*
1514 * Could maybe also all others here?
1515 * Just not sure how that interacts
1516 * with the RX/config path e.g. for
1517 * mesh.
1518 */
1519 break;
1520 default:
1521 return -EBUSY;
1522 }
1523
1524 switch (type) {
1525 case NL80211_IFTYPE_AP:
1526 case NL80211_IFTYPE_STATION:
1527 case NL80211_IFTYPE_ADHOC:
1528 case NL80211_IFTYPE_OCB:
1529 /*
1530 * Could probably support everything
1531 * but WDS here (WDS do_open can fail
1532 * under memory pressure, which this
1533 * code isn't prepared to handle).
1534 */
1535 break;
1536 case NL80211_IFTYPE_P2P_CLIENT:
1537 p2p = true;
1538 internal_type = NL80211_IFTYPE_STATION;
1539 break;
1540 case NL80211_IFTYPE_P2P_GO:
1541 p2p = true;
1542 internal_type = NL80211_IFTYPE_AP;
1543 break;
1544 default:
1545 return -EBUSY;
1546 }
1547
1548 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1549 if (ret)
1550 return ret;
1551
1552 ieee80211_do_stop(sdata, false);
1553
1554 ieee80211_teardown_sdata(sdata);
1555
1556 ret = drv_change_interface(local, sdata, internal_type, p2p);
1557 if (ret)
1558 type = ieee80211_vif_type_p2p(&sdata->vif);
1559
1560 /*
1561 * Ignore return value here, there's not much we can do since
1562 * the driver changed the interface type internally already.
1563 * The warnings will hopefully make driver authors fix it :-)
1564 */
1565 ieee80211_check_queues(sdata, type);
1566
1567 ieee80211_setup_sdata(sdata, type);
1568
1569 err = ieee80211_do_open(&sdata->wdev, false);
1570 WARN(err, "type change: do_open returned %d", err);
1571
1572 return ret;
1573 }
1574
1575 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1576 enum nl80211_iftype type)
1577 {
1578 int ret;
1579
1580 ASSERT_RTNL();
1581
1582 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1583 return 0;
1584
1585 if (ieee80211_sdata_running(sdata)) {
1586 ret = ieee80211_runtime_change_iftype(sdata, type);
1587 if (ret)
1588 return ret;
1589 } else {
1590 /* Purge and reset type-dependent state. */
1591 ieee80211_teardown_sdata(sdata);
1592 ieee80211_setup_sdata(sdata, type);
1593 }
1594
1595 /* reset some values that shouldn't be kept across type changes */
1596 if (type == NL80211_IFTYPE_STATION)
1597 sdata->u.mgd.use_4addr = false;
1598
1599 return 0;
1600 }
1601
1602 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1603 u8 *perm_addr, enum nl80211_iftype type)
1604 {
1605 struct ieee80211_sub_if_data *sdata;
1606 u64 mask, start, addr, val, inc;
1607 u8 *m;
1608 u8 tmp_addr[ETH_ALEN];
1609 int i;
1610
1611 /* default ... something at least */
1612 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1613
1614 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1615 local->hw.wiphy->n_addresses <= 1)
1616 return;
1617
1618 mutex_lock(&local->iflist_mtx);
1619
1620 switch (type) {
1621 case NL80211_IFTYPE_MONITOR:
1622 /* doesn't matter */
1623 break;
1624 case NL80211_IFTYPE_WDS:
1625 case NL80211_IFTYPE_AP_VLAN:
1626 /* match up with an AP interface */
1627 list_for_each_entry(sdata, &local->interfaces, list) {
1628 if (sdata->vif.type != NL80211_IFTYPE_AP)
1629 continue;
1630 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1631 break;
1632 }
1633 /* keep default if no AP interface present */
1634 break;
1635 case NL80211_IFTYPE_P2P_CLIENT:
1636 case NL80211_IFTYPE_P2P_GO:
1637 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1638 list_for_each_entry(sdata, &local->interfaces, list) {
1639 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1640 continue;
1641 if (!ieee80211_sdata_running(sdata))
1642 continue;
1643 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1644 goto out_unlock;
1645 }
1646 }
1647 /* otherwise fall through */
1648 default:
1649 /* assign a new address if possible -- try n_addresses first */
1650 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1651 bool used = false;
1652
1653 list_for_each_entry(sdata, &local->interfaces, list) {
1654 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1655 sdata->vif.addr)) {
1656 used = true;
1657 break;
1658 }
1659 }
1660
1661 if (!used) {
1662 memcpy(perm_addr,
1663 local->hw.wiphy->addresses[i].addr,
1664 ETH_ALEN);
1665 break;
1666 }
1667 }
1668
1669 /* try mask if available */
1670 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1671 break;
1672
1673 m = local->hw.wiphy->addr_mask;
1674 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1675 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1676 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1677
1678 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1679 /* not a contiguous mask ... not handled now! */
1680 pr_info("not contiguous\n");
1681 break;
1682 }
1683
1684 /*
1685 * Pick address of existing interface in case user changed
1686 * MAC address manually, default to perm_addr.
1687 */
1688 m = local->hw.wiphy->perm_addr;
1689 list_for_each_entry(sdata, &local->interfaces, list) {
1690 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1691 continue;
1692 m = sdata->vif.addr;
1693 break;
1694 }
1695 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1696 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1697 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1698
1699 inc = 1ULL<<__ffs64(mask);
1700 val = (start & mask);
1701 addr = (start & ~mask) | (val & mask);
1702 do {
1703 bool used = false;
1704
1705 tmp_addr[5] = addr >> 0*8;
1706 tmp_addr[4] = addr >> 1*8;
1707 tmp_addr[3] = addr >> 2*8;
1708 tmp_addr[2] = addr >> 3*8;
1709 tmp_addr[1] = addr >> 4*8;
1710 tmp_addr[0] = addr >> 5*8;
1711
1712 val += inc;
1713
1714 list_for_each_entry(sdata, &local->interfaces, list) {
1715 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1716 used = true;
1717 break;
1718 }
1719 }
1720
1721 if (!used) {
1722 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1723 break;
1724 }
1725 addr = (start & ~mask) | (val & mask);
1726 } while (addr != start);
1727
1728 break;
1729 }
1730
1731 out_unlock:
1732 mutex_unlock(&local->iflist_mtx);
1733 }
1734
1735 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1736 unsigned char name_assign_type,
1737 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1738 struct vif_params *params)
1739 {
1740 struct net_device *ndev = NULL;
1741 struct ieee80211_sub_if_data *sdata = NULL;
1742 struct txq_info *txqi;
1743 void (*if_setup)(struct net_device *dev);
1744 int ret, i;
1745 int txqs = 1;
1746
1747 ASSERT_RTNL();
1748
1749 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1750 struct wireless_dev *wdev;
1751
1752 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1753 GFP_KERNEL);
1754 if (!sdata)
1755 return -ENOMEM;
1756 wdev = &sdata->wdev;
1757
1758 sdata->dev = NULL;
1759 strlcpy(sdata->name, name, IFNAMSIZ);
1760 ieee80211_assign_perm_addr(local, wdev->address, type);
1761 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1762 } else {
1763 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1764 sizeof(void *));
1765 int txq_size = 0;
1766
1767 if (local->ops->wake_tx_queue)
1768 txq_size += sizeof(struct txq_info) +
1769 local->hw.txq_data_size;
1770
1771 if (local->ops->wake_tx_queue)
1772 if_setup = ieee80211_if_setup_no_queue;
1773 else
1774 if_setup = ieee80211_if_setup;
1775
1776 if (local->hw.queues >= IEEE80211_NUM_ACS)
1777 txqs = IEEE80211_NUM_ACS;
1778
1779 ndev = alloc_netdev_mqs(size + txq_size,
1780 name, name_assign_type,
1781 if_setup, txqs, 1);
1782 if (!ndev)
1783 return -ENOMEM;
1784 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1785
1786 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1787 if (!ndev->tstats) {
1788 free_netdev(ndev);
1789 return -ENOMEM;
1790 }
1791
1792 ndev->needed_headroom = local->tx_headroom +
1793 4*6 /* four MAC addresses */
1794 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1795 + 6 /* mesh */
1796 + 8 /* rfc1042/bridge tunnel */
1797 - ETH_HLEN /* ethernet hard_header_len */
1798 + IEEE80211_ENCRYPT_HEADROOM;
1799 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1800
1801 ret = dev_alloc_name(ndev, ndev->name);
1802 if (ret < 0) {
1803 ieee80211_if_free(ndev);
1804 return ret;
1805 }
1806
1807 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1808 if (params && is_valid_ether_addr(params->macaddr))
1809 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1810 else
1811 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1812 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1813
1814 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1815 sdata = netdev_priv(ndev);
1816 ndev->ieee80211_ptr = &sdata->wdev;
1817 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1818 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1819
1820 if (txq_size) {
1821 txqi = netdev_priv(ndev) + size;
1822 ieee80211_txq_init(sdata, NULL, txqi, 0);
1823 }
1824
1825 sdata->dev = ndev;
1826 }
1827
1828 /* initialise type-independent data */
1829 sdata->wdev.wiphy = local->hw.wiphy;
1830 sdata->local = local;
1831
1832 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1833 skb_queue_head_init(&sdata->fragments[i].skb_list);
1834
1835 INIT_LIST_HEAD(&sdata->key_list);
1836
1837 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1838 ieee80211_dfs_cac_timer_work);
1839 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1840 ieee80211_delayed_tailroom_dec);
1841
1842 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1843 struct ieee80211_supported_band *sband;
1844 sband = local->hw.wiphy->bands[i];
1845 sdata->rc_rateidx_mask[i] =
1846 sband ? (1 << sband->n_bitrates) - 1 : 0;
1847 if (sband) {
1848 __le16 cap;
1849 u16 *vht_rate_mask;
1850
1851 memcpy(sdata->rc_rateidx_mcs_mask[i],
1852 sband->ht_cap.mcs.rx_mask,
1853 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1854
1855 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1856 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1857 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1858 } else {
1859 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1860 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1861 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1862 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1863 }
1864 }
1865
1866 ieee80211_set_default_queues(sdata);
1867
1868 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1869 sdata->user_power_level = local->user_power_level;
1870
1871 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1872
1873 /* setup type-dependent data */
1874 ieee80211_setup_sdata(sdata, type);
1875
1876 if (ndev) {
1877 if (params) {
1878 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1879 if (type == NL80211_IFTYPE_STATION)
1880 sdata->u.mgd.use_4addr = params->use_4addr;
1881 }
1882
1883 ndev->features |= local->hw.netdev_features;
1884
1885 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1886
1887 ret = register_netdevice(ndev);
1888 if (ret) {
1889 ieee80211_if_free(ndev);
1890 return ret;
1891 }
1892 }
1893
1894 mutex_lock(&local->iflist_mtx);
1895 list_add_tail_rcu(&sdata->list, &local->interfaces);
1896 mutex_unlock(&local->iflist_mtx);
1897
1898 if (new_wdev)
1899 *new_wdev = &sdata->wdev;
1900
1901 return 0;
1902 }
1903
1904 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1905 {
1906 ASSERT_RTNL();
1907
1908 mutex_lock(&sdata->local->iflist_mtx);
1909 list_del_rcu(&sdata->list);
1910 mutex_unlock(&sdata->local->iflist_mtx);
1911
1912 synchronize_rcu();
1913
1914 if (sdata->dev) {
1915 unregister_netdevice(sdata->dev);
1916 } else {
1917 cfg80211_unregister_wdev(&sdata->wdev);
1918 ieee80211_teardown_sdata(sdata);
1919 kfree(sdata);
1920 }
1921 }
1922
1923 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1924 {
1925 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1926 return;
1927 ieee80211_do_stop(sdata, true);
1928 }
1929
1930 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1931 {
1932 struct ieee80211_sub_if_data *sdata, *tmp;
1933 LIST_HEAD(unreg_list);
1934 LIST_HEAD(wdev_list);
1935
1936 ASSERT_RTNL();
1937
1938 /* Before destroying the interfaces, make sure they're all stopped so
1939 * that the hardware is stopped. Otherwise, the driver might still be
1940 * iterating the interfaces during the shutdown, e.g. from a worker
1941 * or from RX processing or similar, and if it does so (using atomic
1942 * iteration) while we're manipulating the list, the iteration will
1943 * crash.
1944 *
1945 * After this, the hardware should be stopped and the driver should
1946 * have stopped all of its activities, so that we can do RCU-unaware
1947 * manipulations of the interface list below.
1948 */
1949 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1950
1951 WARN(local->open_count, "%s: open count remains %d\n",
1952 wiphy_name(local->hw.wiphy), local->open_count);
1953
1954 mutex_lock(&local->iflist_mtx);
1955 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1956 list_del(&sdata->list);
1957
1958 if (sdata->dev)
1959 unregister_netdevice_queue(sdata->dev, &unreg_list);
1960 else
1961 list_add(&sdata->list, &wdev_list);
1962 }
1963 mutex_unlock(&local->iflist_mtx);
1964 unregister_netdevice_many(&unreg_list);
1965
1966 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1967 list_del(&sdata->list);
1968 cfg80211_unregister_wdev(&sdata->wdev);
1969 kfree(sdata);
1970 }
1971 }
1972
1973 static int netdev_notify(struct notifier_block *nb,
1974 unsigned long state, void *ptr)
1975 {
1976 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1977 struct ieee80211_sub_if_data *sdata;
1978
1979 if (state != NETDEV_CHANGENAME)
1980 return NOTIFY_DONE;
1981
1982 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1983 return NOTIFY_DONE;
1984
1985 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1986 return NOTIFY_DONE;
1987
1988 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1989 memcpy(sdata->name, dev->name, IFNAMSIZ);
1990 ieee80211_debugfs_rename_netdev(sdata);
1991
1992 return NOTIFY_OK;
1993 }
1994
1995 static struct notifier_block mac80211_netdev_notifier = {
1996 .notifier_call = netdev_notify,
1997 };
1998
1999 int ieee80211_iface_init(void)
2000 {
2001 return register_netdevice_notifier(&mac80211_netdev_notifier);
2002 }
2003
2004 void ieee80211_iface_exit(void)
2005 {
2006 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2007 }
Linux with added FPC-III support