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mac80211: use channel contexts
[mirror_ubuntu-jammy-kernel.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling (except master interface)
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 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45
46 static u32 ieee80211_idle_off(struct ieee80211_local *local,
47 const char *reason)
48 {
49 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
50 return 0;
51
52 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
53 return IEEE80211_CONF_CHANGE_IDLE;
54 }
55
56 static u32 ieee80211_idle_on(struct ieee80211_local *local)
57 {
58 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
59 return 0;
60
61 drv_flush(local, false);
62
63 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
64 return IEEE80211_CONF_CHANGE_IDLE;
65 }
66
67 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
68 {
69 struct ieee80211_sub_if_data *sdata;
70 int count = 0;
71 bool working = false, scanning = false;
72 unsigned int led_trig_start = 0, led_trig_stop = 0;
73 struct ieee80211_roc_work *roc;
74
75 #ifdef CONFIG_PROVE_LOCKING
76 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
77 !lockdep_is_held(&local->iflist_mtx));
78 #endif
79 lockdep_assert_held(&local->mtx);
80
81 list_for_each_entry(sdata, &local->interfaces, list) {
82 if (!ieee80211_sdata_running(sdata)) {
83 sdata->vif.bss_conf.idle = true;
84 continue;
85 }
86
87 sdata->old_idle = sdata->vif.bss_conf.idle;
88
89 /* do not count disabled managed interfaces */
90 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
91 !sdata->u.mgd.associated &&
92 !sdata->u.mgd.auth_data &&
93 !sdata->u.mgd.assoc_data) {
94 sdata->vif.bss_conf.idle = true;
95 continue;
96 }
97 /* do not count unused IBSS interfaces */
98 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
99 !sdata->u.ibss.ssid_len) {
100 sdata->vif.bss_conf.idle = true;
101 continue;
102 }
103
104 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
105 continue;
106
107 /* count everything else */
108 sdata->vif.bss_conf.idle = false;
109 count++;
110 }
111
112 if (!local->ops->remain_on_channel) {
113 list_for_each_entry(roc, &local->roc_list, list) {
114 working = true;
115 roc->sdata->vif.bss_conf.idle = false;
116 }
117 }
118
119 sdata = rcu_dereference_protected(local->scan_sdata,
120 lockdep_is_held(&local->mtx));
121 if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
122 scanning = true;
123 sdata->vif.bss_conf.idle = false;
124 }
125
126 list_for_each_entry(sdata, &local->interfaces, list) {
127 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
128 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
129 sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
130 continue;
131 if (sdata->old_idle == sdata->vif.bss_conf.idle)
132 continue;
133 if (!ieee80211_sdata_running(sdata))
134 continue;
135 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
136 }
137
138 if (working || scanning)
139 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
140 else
141 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
142
143 if (count)
144 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
145 else
146 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
147
148 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
149
150 if (working)
151 return ieee80211_idle_off(local, "working");
152 if (scanning)
153 return ieee80211_idle_off(local, "scanning");
154 if (!count)
155 return ieee80211_idle_on(local);
156 else
157 return ieee80211_idle_off(local, "in use");
158
159 return 0;
160 }
161
162 void ieee80211_recalc_idle(struct ieee80211_local *local)
163 {
164 u32 chg;
165
166 mutex_lock(&local->iflist_mtx);
167 chg = __ieee80211_recalc_idle(local);
168 mutex_unlock(&local->iflist_mtx);
169 if (chg)
170 ieee80211_hw_config(local, chg);
171 }
172
173 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
174 {
175 int meshhdrlen;
176 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
177
178 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
179
180 /* FIX: what would be proper limits for MTU?
181 * This interface uses 802.3 frames. */
182 if (new_mtu < 256 ||
183 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
184 return -EINVAL;
185 }
186
187 dev->mtu = new_mtu;
188 return 0;
189 }
190
191 static int ieee80211_change_mac(struct net_device *dev, void *addr)
192 {
193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
194 struct sockaddr *sa = addr;
195 int ret;
196
197 if (ieee80211_sdata_running(sdata))
198 return -EBUSY;
199
200 ret = eth_mac_addr(dev, sa);
201
202 if (ret == 0)
203 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
204
205 return ret;
206 }
207
208 static inline int identical_mac_addr_allowed(int type1, int type2)
209 {
210 return type1 == NL80211_IFTYPE_MONITOR ||
211 type2 == NL80211_IFTYPE_MONITOR ||
212 type1 == NL80211_IFTYPE_P2P_DEVICE ||
213 type2 == NL80211_IFTYPE_P2P_DEVICE ||
214 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
215 (type1 == NL80211_IFTYPE_WDS &&
216 (type2 == NL80211_IFTYPE_WDS ||
217 type2 == NL80211_IFTYPE_AP)) ||
218 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
219 (type1 == NL80211_IFTYPE_AP_VLAN &&
220 (type2 == NL80211_IFTYPE_AP ||
221 type2 == NL80211_IFTYPE_AP_VLAN));
222 }
223
224 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
225 enum nl80211_iftype iftype)
226 {
227 struct ieee80211_local *local = sdata->local;
228 struct ieee80211_sub_if_data *nsdata;
229
230 ASSERT_RTNL();
231
232 /* we hold the RTNL here so can safely walk the list */
233 list_for_each_entry(nsdata, &local->interfaces, list) {
234 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
235 /*
236 * Allow only a single IBSS interface to be up at any
237 * time. This is restricted because beacon distribution
238 * cannot work properly if both are in the same IBSS.
239 *
240 * To remove this restriction we'd have to disallow them
241 * from setting the same SSID on different IBSS interfaces
242 * belonging to the same hardware. Then, however, we're
243 * faced with having to adopt two different TSF timers...
244 */
245 if (iftype == NL80211_IFTYPE_ADHOC &&
246 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
247 return -EBUSY;
248
249 /*
250 * The remaining checks are only performed for interfaces
251 * with the same MAC address.
252 */
253 if (!ether_addr_equal(sdata->vif.addr,
254 nsdata->vif.addr))
255 continue;
256
257 /*
258 * check whether it may have the same address
259 */
260 if (!identical_mac_addr_allowed(iftype,
261 nsdata->vif.type))
262 return -ENOTUNIQ;
263
264 /*
265 * can only add VLANs to enabled APs
266 */
267 if (iftype == NL80211_IFTYPE_AP_VLAN &&
268 nsdata->vif.type == NL80211_IFTYPE_AP)
269 sdata->bss = &nsdata->u.ap;
270 }
271 }
272
273 return 0;
274 }
275
276 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
277 {
278 int n_queues = sdata->local->hw.queues;
279 int i;
280
281 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
282 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
283 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
284 IEEE80211_INVAL_HW_QUEUE))
285 return -EINVAL;
286 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
287 n_queues))
288 return -EINVAL;
289 }
290 }
291
292 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
293 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
294 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
295 return 0;
296 }
297
298 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
299 return -EINVAL;
300
301 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
302 return -EINVAL;
303
304 return 0;
305 }
306
307 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
308 const int offset)
309 {
310 struct ieee80211_local *local = sdata->local;
311 u32 flags = sdata->u.mntr_flags;
312
313 #define ADJUST(_f, _s) do { \
314 if (flags & MONITOR_FLAG_##_f) \
315 local->fif_##_s += offset; \
316 } while (0)
317
318 ADJUST(FCSFAIL, fcsfail);
319 ADJUST(PLCPFAIL, plcpfail);
320 ADJUST(CONTROL, control);
321 ADJUST(CONTROL, pspoll);
322 ADJUST(OTHER_BSS, other_bss);
323
324 #undef ADJUST
325 }
326
327 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
328 {
329 struct ieee80211_local *local = sdata->local;
330 int i;
331
332 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
333 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
334 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
335 else if (local->hw.queues >= IEEE80211_NUM_ACS)
336 sdata->vif.hw_queue[i] = i;
337 else
338 sdata->vif.hw_queue[i] = 0;
339 }
340 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341 }
342
343 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
344 {
345 struct ieee80211_sub_if_data *sdata;
346 int ret = 0;
347
348 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
349 return 0;
350
351 mutex_lock(&local->iflist_mtx);
352
353 if (local->monitor_sdata)
354 goto out_unlock;
355
356 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
357 if (!sdata) {
358 ret = -ENOMEM;
359 goto out_unlock;
360 }
361
362 /* set up data */
363 sdata->local = local;
364 sdata->vif.type = NL80211_IFTYPE_MONITOR;
365 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
366 wiphy_name(local->hw.wiphy));
367
368 ieee80211_set_default_queues(sdata);
369
370 ret = drv_add_interface(local, sdata);
371 if (WARN_ON(ret)) {
372 /* ok .. stupid driver, it asked for this! */
373 kfree(sdata);
374 goto out_unlock;
375 }
376
377 ret = ieee80211_check_queues(sdata);
378 if (ret) {
379 kfree(sdata);
380 goto out_unlock;
381 }
382
383 ret = ieee80211_vif_use_channel(sdata, local->monitor_channel,
384 local->monitor_channel_type,
385 IEEE80211_CHANCTX_EXCLUSIVE);
386 if (ret) {
387 drv_remove_interface(local, sdata);
388 kfree(sdata);
389 goto out_unlock;
390 }
391
392 rcu_assign_pointer(local->monitor_sdata, sdata);
393 out_unlock:
394 mutex_unlock(&local->iflist_mtx);
395 return ret;
396 }
397
398 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
399 {
400 struct ieee80211_sub_if_data *sdata;
401
402 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
403 return;
404
405 mutex_lock(&local->iflist_mtx);
406
407 sdata = rcu_dereference_protected(local->monitor_sdata,
408 lockdep_is_held(&local->iflist_mtx));
409 if (!sdata)
410 goto out_unlock;
411
412 rcu_assign_pointer(local->monitor_sdata, NULL);
413 synchronize_net();
414
415 ieee80211_vif_release_channel(sdata);
416
417 drv_remove_interface(local, sdata);
418
419 kfree(sdata);
420 out_unlock:
421 mutex_unlock(&local->iflist_mtx);
422 }
423
424 /*
425 * NOTE: Be very careful when changing this function, it must NOT return
426 * an error on interface type changes that have been pre-checked, so most
427 * checks should be in ieee80211_check_concurrent_iface.
428 */
429 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
430 {
431 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
432 struct net_device *dev = wdev->netdev;
433 struct ieee80211_local *local = sdata->local;
434 struct sta_info *sta;
435 u32 changed = 0;
436 int res;
437 u32 hw_reconf_flags = 0;
438
439 switch (sdata->vif.type) {
440 case NL80211_IFTYPE_WDS:
441 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
442 return -ENOLINK;
443 break;
444 case NL80211_IFTYPE_AP_VLAN: {
445 struct ieee80211_sub_if_data *master;
446
447 if (!sdata->bss)
448 return -ENOLINK;
449
450 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
451
452 master = container_of(sdata->bss,
453 struct ieee80211_sub_if_data, u.ap);
454 sdata->control_port_protocol =
455 master->control_port_protocol;
456 sdata->control_port_no_encrypt =
457 master->control_port_no_encrypt;
458 break;
459 }
460 case NL80211_IFTYPE_AP:
461 sdata->bss = &sdata->u.ap;
462 break;
463 case NL80211_IFTYPE_MESH_POINT:
464 case NL80211_IFTYPE_STATION:
465 case NL80211_IFTYPE_MONITOR:
466 case NL80211_IFTYPE_ADHOC:
467 case NL80211_IFTYPE_P2P_DEVICE:
468 /* no special treatment */
469 break;
470 case NL80211_IFTYPE_UNSPECIFIED:
471 case NUM_NL80211_IFTYPES:
472 case NL80211_IFTYPE_P2P_CLIENT:
473 case NL80211_IFTYPE_P2P_GO:
474 /* cannot happen */
475 WARN_ON(1);
476 break;
477 }
478
479 if (local->open_count == 0) {
480 res = drv_start(local);
481 if (res)
482 goto err_del_bss;
483 if (local->ops->napi_poll)
484 napi_enable(&local->napi);
485 /* we're brought up, everything changes */
486 hw_reconf_flags = ~0;
487 ieee80211_led_radio(local, true);
488 ieee80211_mod_tpt_led_trig(local,
489 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
490 }
491
492 /*
493 * Copy the hopefully now-present MAC address to
494 * this interface, if it has the special null one.
495 */
496 if (dev && is_zero_ether_addr(dev->dev_addr)) {
497 memcpy(dev->dev_addr,
498 local->hw.wiphy->perm_addr,
499 ETH_ALEN);
500 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
501
502 if (!is_valid_ether_addr(dev->dev_addr)) {
503 res = -EADDRNOTAVAIL;
504 goto err_stop;
505 }
506 }
507
508 switch (sdata->vif.type) {
509 case NL80211_IFTYPE_AP_VLAN:
510 /* no need to tell driver, but set carrier */
511 if (rtnl_dereference(sdata->bss->beacon))
512 netif_carrier_on(dev);
513 else
514 netif_carrier_off(dev);
515 break;
516 case NL80211_IFTYPE_MONITOR:
517 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
518 local->cooked_mntrs++;
519 break;
520 }
521
522 if (local->monitors == 0 && local->open_count == 0) {
523 res = ieee80211_add_virtual_monitor(local);
524 if (res)
525 goto err_stop;
526 }
527
528 /* must be before the call to ieee80211_configure_filter */
529 local->monitors++;
530 if (local->monitors == 1) {
531 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
532 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
533 }
534
535 ieee80211_adjust_monitor_flags(sdata, 1);
536 ieee80211_configure_filter(local);
537
538 netif_carrier_on(dev);
539 break;
540 default:
541 if (coming_up) {
542 ieee80211_del_virtual_monitor(local);
543
544 res = drv_add_interface(local, sdata);
545 if (res)
546 goto err_stop;
547 res = ieee80211_check_queues(sdata);
548 if (res)
549 goto err_del_interface;
550 }
551
552 if (sdata->vif.type == NL80211_IFTYPE_AP) {
553 local->fif_pspoll++;
554 local->fif_probe_req++;
555
556 ieee80211_configure_filter(local);
557 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
558 local->fif_probe_req++;
559 }
560
561 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
562 changed |= ieee80211_reset_erp_info(sdata);
563 ieee80211_bss_info_change_notify(sdata, changed);
564
565 switch (sdata->vif.type) {
566 case NL80211_IFTYPE_STATION:
567 case NL80211_IFTYPE_ADHOC:
568 case NL80211_IFTYPE_AP:
569 case NL80211_IFTYPE_MESH_POINT:
570 netif_carrier_off(dev);
571 break;
572 case NL80211_IFTYPE_WDS:
573 case NL80211_IFTYPE_P2P_DEVICE:
574 break;
575 default:
576 netif_carrier_on(dev);
577 }
578
579 /*
580 * set default queue parameters so drivers don't
581 * need to initialise the hardware if the hardware
582 * doesn't start up with sane defaults
583 */
584 ieee80211_set_wmm_default(sdata, true);
585 }
586
587 set_bit(SDATA_STATE_RUNNING, &sdata->state);
588
589 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
590 /* Create STA entry for the WDS peer */
591 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
592 GFP_KERNEL);
593 if (!sta) {
594 res = -ENOMEM;
595 goto err_del_interface;
596 }
597
598 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
599 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
600 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
601
602 res = sta_info_insert(sta);
603 if (res) {
604 /* STA has been freed */
605 goto err_del_interface;
606 }
607
608 rate_control_rate_init(sta);
609 netif_carrier_on(dev);
610 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
611 rcu_assign_pointer(local->p2p_sdata, sdata);
612 }
613
614 /*
615 * set_multicast_list will be invoked by the networking core
616 * which will check whether any increments here were done in
617 * error and sync them down to the hardware as filter flags.
618 */
619 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
620 atomic_inc(&local->iff_allmultis);
621
622 if (sdata->flags & IEEE80211_SDATA_PROMISC)
623 atomic_inc(&local->iff_promiscs);
624
625 mutex_lock(&local->mtx);
626 hw_reconf_flags |= __ieee80211_recalc_idle(local);
627 mutex_unlock(&local->mtx);
628
629 if (coming_up)
630 local->open_count++;
631
632 if (hw_reconf_flags)
633 ieee80211_hw_config(local, hw_reconf_flags);
634
635 ieee80211_recalc_ps(local, -1);
636
637 if (dev)
638 netif_tx_start_all_queues(dev);
639
640 return 0;
641 err_del_interface:
642 drv_remove_interface(local, sdata);
643 err_stop:
644 if (!local->open_count)
645 drv_stop(local);
646 err_del_bss:
647 sdata->bss = NULL;
648 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
649 list_del(&sdata->u.vlan.list);
650 /* might already be clear but that doesn't matter */
651 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
652 return res;
653 }
654
655 static int ieee80211_open(struct net_device *dev)
656 {
657 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
658 int err;
659
660 /* fail early if user set an invalid address */
661 if (!is_valid_ether_addr(dev->dev_addr))
662 return -EADDRNOTAVAIL;
663
664 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
665 if (err)
666 return err;
667
668 return ieee80211_do_open(&sdata->wdev, true);
669 }
670
671 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
672 bool going_down)
673 {
674 struct ieee80211_local *local = sdata->local;
675 unsigned long flags;
676 struct sk_buff *skb, *tmp;
677 u32 hw_reconf_flags = 0;
678 int i;
679
680 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
681
682 if (rcu_access_pointer(local->scan_sdata) == sdata)
683 ieee80211_scan_cancel(local);
684
685 /*
686 * Stop TX on this interface first.
687 */
688 if (sdata->dev)
689 netif_tx_stop_all_queues(sdata->dev);
690
691 ieee80211_roc_purge(sdata);
692
693 /*
694 * Remove all stations associated with this interface.
695 *
696 * This must be done before calling ops->remove_interface()
697 * because otherwise we can later invoke ops->sta_notify()
698 * whenever the STAs are removed, and that invalidates driver
699 * assumptions about always getting a vif pointer that is valid
700 * (because if we remove a STA after ops->remove_interface()
701 * the driver will have removed the vif info already!)
702 *
703 * This is relevant only in AP, WDS and mesh modes, since in
704 * all other modes we've already removed all stations when
705 * disconnecting etc.
706 */
707 sta_info_flush(local, sdata);
708
709 /*
710 * Don't count this interface for promisc/allmulti while it
711 * is down. dev_mc_unsync() will invoke set_multicast_list
712 * on the master interface which will sync these down to the
713 * hardware as filter flags.
714 */
715 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
716 atomic_dec(&local->iff_allmultis);
717
718 if (sdata->flags & IEEE80211_SDATA_PROMISC)
719 atomic_dec(&local->iff_promiscs);
720
721 if (sdata->vif.type == NL80211_IFTYPE_AP) {
722 local->fif_pspoll--;
723 local->fif_probe_req--;
724 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
725 local->fif_probe_req--;
726 }
727
728 if (sdata->dev) {
729 netif_addr_lock_bh(sdata->dev);
730 spin_lock_bh(&local->filter_lock);
731 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
732 sdata->dev->addr_len);
733 spin_unlock_bh(&local->filter_lock);
734 netif_addr_unlock_bh(sdata->dev);
735
736 ieee80211_configure_filter(local);
737 }
738
739 del_timer_sync(&local->dynamic_ps_timer);
740 cancel_work_sync(&local->dynamic_ps_enable_work);
741
742 /* APs need special treatment */
743 if (sdata->vif.type == NL80211_IFTYPE_AP) {
744 struct ieee80211_sub_if_data *vlan, *tmpsdata;
745 struct beacon_data *old_beacon =
746 rtnl_dereference(sdata->u.ap.beacon);
747 struct probe_resp *old_probe_resp =
748 rtnl_dereference(sdata->u.ap.probe_resp);
749
750 /* sdata_running will return false, so this will disable */
751 ieee80211_bss_info_change_notify(sdata,
752 BSS_CHANGED_BEACON_ENABLED);
753
754 /* remove beacon and probe response */
755 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
756 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
757 synchronize_rcu();
758 kfree(old_beacon);
759 kfree(old_probe_resp);
760
761 /* down all dependent devices, that is VLANs */
762 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
763 u.vlan.list)
764 dev_close(vlan->dev);
765 WARN_ON(!list_empty(&sdata->u.ap.vlans));
766
767 /* free all potentially still buffered bcast frames */
768 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
769 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
770 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
771 ieee80211_mgd_stop(sdata);
772 }
773
774 if (going_down)
775 local->open_count--;
776
777 switch (sdata->vif.type) {
778 case NL80211_IFTYPE_AP_VLAN:
779 list_del(&sdata->u.vlan.list);
780 /* no need to tell driver */
781 break;
782 case NL80211_IFTYPE_MONITOR:
783 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
784 local->cooked_mntrs--;
785 break;
786 }
787
788 local->monitors--;
789 if (local->monitors == 0) {
790 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
791 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
792 ieee80211_del_virtual_monitor(local);
793 }
794
795 ieee80211_adjust_monitor_flags(sdata, -1);
796 ieee80211_configure_filter(local);
797 break;
798 case NL80211_IFTYPE_P2P_DEVICE:
799 /* relies on synchronize_rcu() below */
800 rcu_assign_pointer(local->p2p_sdata, NULL);
801 /* fall through */
802 default:
803 flush_work(&sdata->work);
804 /*
805 * When we get here, the interface is marked down.
806 * Call rcu_barrier() to wait both for the RX path
807 * should it be using the interface and enqueuing
808 * frames at this very time on another CPU, and
809 * for the sta free call_rcu callbacks.
810 */
811 rcu_barrier();
812
813 /*
814 * free_sta_rcu() enqueues a work for the actual
815 * sta cleanup, so we need to flush it while
816 * sdata is still valid.
817 */
818 flush_workqueue(local->workqueue);
819
820 skb_queue_purge(&sdata->skb_queue);
821
822 /*
823 * Free all remaining keys, there shouldn't be any,
824 * except maybe group keys in AP more or WDS?
825 */
826 ieee80211_free_keys(sdata);
827
828 if (going_down)
829 drv_remove_interface(local, sdata);
830 }
831
832 sdata->bss = NULL;
833
834 mutex_lock(&local->mtx);
835 hw_reconf_flags |= __ieee80211_recalc_idle(local);
836 mutex_unlock(&local->mtx);
837
838 ieee80211_recalc_ps(local, -1);
839
840 if (local->open_count == 0) {
841 if (local->ops->napi_poll)
842 napi_disable(&local->napi);
843 ieee80211_clear_tx_pending(local);
844 ieee80211_stop_device(local);
845
846 /* no reconfiguring after stop! */
847 hw_reconf_flags = 0;
848 }
849
850 /* do after stop to avoid reconfiguring when we stop anyway */
851 if (hw_reconf_flags)
852 ieee80211_hw_config(local, hw_reconf_flags);
853
854 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
855 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
856 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
857 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
858 if (info->control.vif == &sdata->vif) {
859 __skb_unlink(skb, &local->pending[i]);
860 dev_kfree_skb_irq(skb);
861 }
862 }
863 }
864 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
865
866 if (local->monitors == local->open_count && local->monitors > 0)
867 ieee80211_add_virtual_monitor(local);
868 }
869
870 static int ieee80211_stop(struct net_device *dev)
871 {
872 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
873
874 ieee80211_do_stop(sdata, true);
875
876 return 0;
877 }
878
879 static void ieee80211_set_multicast_list(struct net_device *dev)
880 {
881 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
882 struct ieee80211_local *local = sdata->local;
883 int allmulti, promisc, sdata_allmulti, sdata_promisc;
884
885 allmulti = !!(dev->flags & IFF_ALLMULTI);
886 promisc = !!(dev->flags & IFF_PROMISC);
887 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
888 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
889
890 if (allmulti != sdata_allmulti) {
891 if (dev->flags & IFF_ALLMULTI)
892 atomic_inc(&local->iff_allmultis);
893 else
894 atomic_dec(&local->iff_allmultis);
895 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
896 }
897
898 if (promisc != sdata_promisc) {
899 if (dev->flags & IFF_PROMISC)
900 atomic_inc(&local->iff_promiscs);
901 else
902 atomic_dec(&local->iff_promiscs);
903 sdata->flags ^= IEEE80211_SDATA_PROMISC;
904 }
905 spin_lock_bh(&local->filter_lock);
906 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
907 spin_unlock_bh(&local->filter_lock);
908 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
909 }
910
911 /*
912 * Called when the netdev is removed or, by the code below, before
913 * the interface type changes.
914 */
915 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
916 {
917 struct ieee80211_local *local = sdata->local;
918 int flushed;
919 int i;
920
921 /* free extra data */
922 ieee80211_free_keys(sdata);
923
924 ieee80211_debugfs_remove_netdev(sdata);
925
926 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
927 __skb_queue_purge(&sdata->fragments[i].skb_list);
928 sdata->fragment_next = 0;
929
930 if (ieee80211_vif_is_mesh(&sdata->vif))
931 mesh_rmc_free(sdata);
932
933 flushed = sta_info_flush(local, sdata);
934 WARN_ON(flushed);
935 }
936
937 static void ieee80211_uninit(struct net_device *dev)
938 {
939 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
940 }
941
942 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
943 struct sk_buff *skb)
944 {
945 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
946 }
947
948 static const struct net_device_ops ieee80211_dataif_ops = {
949 .ndo_open = ieee80211_open,
950 .ndo_stop = ieee80211_stop,
951 .ndo_uninit = ieee80211_uninit,
952 .ndo_start_xmit = ieee80211_subif_start_xmit,
953 .ndo_set_rx_mode = ieee80211_set_multicast_list,
954 .ndo_change_mtu = ieee80211_change_mtu,
955 .ndo_set_mac_address = ieee80211_change_mac,
956 .ndo_select_queue = ieee80211_netdev_select_queue,
957 };
958
959 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
960 struct sk_buff *skb)
961 {
962 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
963 struct ieee80211_local *local = sdata->local;
964 struct ieee80211_hdr *hdr;
965 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
966
967 if (local->hw.queues < IEEE80211_NUM_ACS)
968 return 0;
969
970 if (skb->len < 4 ||
971 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
972 return 0; /* doesn't matter, frame will be dropped */
973
974 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
975
976 return ieee80211_select_queue_80211(sdata, skb, hdr);
977 }
978
979 static const struct net_device_ops ieee80211_monitorif_ops = {
980 .ndo_open = ieee80211_open,
981 .ndo_stop = ieee80211_stop,
982 .ndo_uninit = ieee80211_uninit,
983 .ndo_start_xmit = ieee80211_monitor_start_xmit,
984 .ndo_set_rx_mode = ieee80211_set_multicast_list,
985 .ndo_change_mtu = ieee80211_change_mtu,
986 .ndo_set_mac_address = eth_mac_addr,
987 .ndo_select_queue = ieee80211_monitor_select_queue,
988 };
989
990 static void ieee80211_if_setup(struct net_device *dev)
991 {
992 ether_setup(dev);
993 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
994 dev->netdev_ops = &ieee80211_dataif_ops;
995 dev->destructor = free_netdev;
996 }
997
998 static void ieee80211_iface_work(struct work_struct *work)
999 {
1000 struct ieee80211_sub_if_data *sdata =
1001 container_of(work, struct ieee80211_sub_if_data, work);
1002 struct ieee80211_local *local = sdata->local;
1003 struct sk_buff *skb;
1004 struct sta_info *sta;
1005 struct ieee80211_ra_tid *ra_tid;
1006
1007 if (!ieee80211_sdata_running(sdata))
1008 return;
1009
1010 if (local->scanning)
1011 return;
1012
1013 /*
1014 * ieee80211_queue_work() should have picked up most cases,
1015 * here we'll pick the rest.
1016 */
1017 if (WARN(local->suspended,
1018 "interface work scheduled while going to suspend\n"))
1019 return;
1020
1021 /* first process frames */
1022 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1023 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1024
1025 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1026 ra_tid = (void *)&skb->cb;
1027 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1028 ra_tid->tid);
1029 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1030 ra_tid = (void *)&skb->cb;
1031 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1032 ra_tid->tid);
1033 } else if (ieee80211_is_action(mgmt->frame_control) &&
1034 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1035 int len = skb->len;
1036
1037 mutex_lock(&local->sta_mtx);
1038 sta = sta_info_get_bss(sdata, mgmt->sa);
1039 if (sta) {
1040 switch (mgmt->u.action.u.addba_req.action_code) {
1041 case WLAN_ACTION_ADDBA_REQ:
1042 ieee80211_process_addba_request(
1043 local, sta, mgmt, len);
1044 break;
1045 case WLAN_ACTION_ADDBA_RESP:
1046 ieee80211_process_addba_resp(local, sta,
1047 mgmt, len);
1048 break;
1049 case WLAN_ACTION_DELBA:
1050 ieee80211_process_delba(sdata, sta,
1051 mgmt, len);
1052 break;
1053 default:
1054 WARN_ON(1);
1055 break;
1056 }
1057 }
1058 mutex_unlock(&local->sta_mtx);
1059 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1060 struct ieee80211_hdr *hdr = (void *)mgmt;
1061 /*
1062 * So the frame isn't mgmt, but frame_control
1063 * is at the right place anyway, of course, so
1064 * the if statement is correct.
1065 *
1066 * Warn if we have other data frame types here,
1067 * they must not get here.
1068 */
1069 WARN_ON(hdr->frame_control &
1070 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1071 WARN_ON(!(hdr->seq_ctrl &
1072 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1073 /*
1074 * This was a fragment of a frame, received while
1075 * a block-ack session was active. That cannot be
1076 * right, so terminate the session.
1077 */
1078 mutex_lock(&local->sta_mtx);
1079 sta = sta_info_get_bss(sdata, mgmt->sa);
1080 if (sta) {
1081 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1082 IEEE80211_QOS_CTL_TID_MASK;
1083
1084 __ieee80211_stop_rx_ba_session(
1085 sta, tid, WLAN_BACK_RECIPIENT,
1086 WLAN_REASON_QSTA_REQUIRE_SETUP,
1087 true);
1088 }
1089 mutex_unlock(&local->sta_mtx);
1090 } else switch (sdata->vif.type) {
1091 case NL80211_IFTYPE_STATION:
1092 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1093 break;
1094 case NL80211_IFTYPE_ADHOC:
1095 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1096 break;
1097 case NL80211_IFTYPE_MESH_POINT:
1098 if (!ieee80211_vif_is_mesh(&sdata->vif))
1099 break;
1100 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1101 break;
1102 default:
1103 WARN(1, "frame for unexpected interface type");
1104 break;
1105 }
1106
1107 kfree_skb(skb);
1108 }
1109
1110 /* then other type-dependent work */
1111 switch (sdata->vif.type) {
1112 case NL80211_IFTYPE_STATION:
1113 ieee80211_sta_work(sdata);
1114 break;
1115 case NL80211_IFTYPE_ADHOC:
1116 ieee80211_ibss_work(sdata);
1117 break;
1118 case NL80211_IFTYPE_MESH_POINT:
1119 if (!ieee80211_vif_is_mesh(&sdata->vif))
1120 break;
1121 ieee80211_mesh_work(sdata);
1122 break;
1123 default:
1124 break;
1125 }
1126 }
1127
1128
1129 /*
1130 * Helper function to initialise an interface to a specific type.
1131 */
1132 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1133 enum nl80211_iftype type)
1134 {
1135 /* clear type-dependent union */
1136 memset(&sdata->u, 0, sizeof(sdata->u));
1137
1138 /* and set some type-dependent values */
1139 sdata->vif.type = type;
1140 sdata->vif.p2p = false;
1141 sdata->wdev.iftype = type;
1142
1143 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1144 sdata->control_port_no_encrypt = false;
1145
1146 sdata->noack_map = 0;
1147
1148 /* only monitor/p2p-device differ */
1149 if (sdata->dev) {
1150 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1151 sdata->dev->type = ARPHRD_ETHER;
1152 }
1153
1154 skb_queue_head_init(&sdata->skb_queue);
1155 INIT_WORK(&sdata->work, ieee80211_iface_work);
1156
1157 switch (type) {
1158 case NL80211_IFTYPE_P2P_GO:
1159 type = NL80211_IFTYPE_AP;
1160 sdata->vif.type = type;
1161 sdata->vif.p2p = true;
1162 /* fall through */
1163 case NL80211_IFTYPE_AP:
1164 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1165 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1166 break;
1167 case NL80211_IFTYPE_P2P_CLIENT:
1168 type = NL80211_IFTYPE_STATION;
1169 sdata->vif.type = type;
1170 sdata->vif.p2p = true;
1171 /* fall through */
1172 case NL80211_IFTYPE_STATION:
1173 ieee80211_sta_setup_sdata(sdata);
1174 break;
1175 case NL80211_IFTYPE_ADHOC:
1176 ieee80211_ibss_setup_sdata(sdata);
1177 break;
1178 case NL80211_IFTYPE_MESH_POINT:
1179 if (ieee80211_vif_is_mesh(&sdata->vif))
1180 ieee80211_mesh_init_sdata(sdata);
1181 break;
1182 case NL80211_IFTYPE_MONITOR:
1183 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1184 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1185 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1186 MONITOR_FLAG_OTHER_BSS;
1187 break;
1188 case NL80211_IFTYPE_WDS:
1189 case NL80211_IFTYPE_AP_VLAN:
1190 case NL80211_IFTYPE_P2P_DEVICE:
1191 break;
1192 case NL80211_IFTYPE_UNSPECIFIED:
1193 case NUM_NL80211_IFTYPES:
1194 BUG();
1195 break;
1196 }
1197
1198 ieee80211_debugfs_add_netdev(sdata);
1199 }
1200
1201 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1202 enum nl80211_iftype type)
1203 {
1204 struct ieee80211_local *local = sdata->local;
1205 int ret, err;
1206 enum nl80211_iftype internal_type = type;
1207 bool p2p = false;
1208
1209 ASSERT_RTNL();
1210
1211 if (!local->ops->change_interface)
1212 return -EBUSY;
1213
1214 switch (sdata->vif.type) {
1215 case NL80211_IFTYPE_AP:
1216 case NL80211_IFTYPE_STATION:
1217 case NL80211_IFTYPE_ADHOC:
1218 /*
1219 * Could maybe also all others here?
1220 * Just not sure how that interacts
1221 * with the RX/config path e.g. for
1222 * mesh.
1223 */
1224 break;
1225 default:
1226 return -EBUSY;
1227 }
1228
1229 switch (type) {
1230 case NL80211_IFTYPE_AP:
1231 case NL80211_IFTYPE_STATION:
1232 case NL80211_IFTYPE_ADHOC:
1233 /*
1234 * Could probably support everything
1235 * but WDS here (WDS do_open can fail
1236 * under memory pressure, which this
1237 * code isn't prepared to handle).
1238 */
1239 break;
1240 case NL80211_IFTYPE_P2P_CLIENT:
1241 p2p = true;
1242 internal_type = NL80211_IFTYPE_STATION;
1243 break;
1244 case NL80211_IFTYPE_P2P_GO:
1245 p2p = true;
1246 internal_type = NL80211_IFTYPE_AP;
1247 break;
1248 default:
1249 return -EBUSY;
1250 }
1251
1252 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1253 if (ret)
1254 return ret;
1255
1256 ieee80211_do_stop(sdata, false);
1257
1258 ieee80211_teardown_sdata(sdata);
1259
1260 ret = drv_change_interface(local, sdata, internal_type, p2p);
1261 if (ret)
1262 type = sdata->vif.type;
1263
1264 /*
1265 * Ignore return value here, there's not much we can do since
1266 * the driver changed the interface type internally already.
1267 * The warnings will hopefully make driver authors fix it :-)
1268 */
1269 ieee80211_check_queues(sdata);
1270
1271 ieee80211_setup_sdata(sdata, type);
1272
1273 err = ieee80211_do_open(&sdata->wdev, false);
1274 WARN(err, "type change: do_open returned %d", err);
1275
1276 return ret;
1277 }
1278
1279 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1280 enum nl80211_iftype type)
1281 {
1282 int ret;
1283
1284 ASSERT_RTNL();
1285
1286 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1287 return 0;
1288
1289 if (ieee80211_sdata_running(sdata)) {
1290 ret = ieee80211_runtime_change_iftype(sdata, type);
1291 if (ret)
1292 return ret;
1293 } else {
1294 /* Purge and reset type-dependent state. */
1295 ieee80211_teardown_sdata(sdata);
1296 ieee80211_setup_sdata(sdata, type);
1297 }
1298
1299 /* reset some values that shouldn't be kept across type changes */
1300 sdata->drop_unencrypted = 0;
1301 if (type == NL80211_IFTYPE_STATION)
1302 sdata->u.mgd.use_4addr = false;
1303
1304 return 0;
1305 }
1306
1307 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1308 u8 *perm_addr, enum nl80211_iftype type)
1309 {
1310 struct ieee80211_sub_if_data *sdata;
1311 u64 mask, start, addr, val, inc;
1312 u8 *m;
1313 u8 tmp_addr[ETH_ALEN];
1314 int i;
1315
1316 /* default ... something at least */
1317 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1318
1319 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1320 local->hw.wiphy->n_addresses <= 1)
1321 return;
1322
1323 mutex_lock(&local->iflist_mtx);
1324
1325 switch (type) {
1326 case NL80211_IFTYPE_MONITOR:
1327 /* doesn't matter */
1328 break;
1329 case NL80211_IFTYPE_WDS:
1330 case NL80211_IFTYPE_AP_VLAN:
1331 /* match up with an AP interface */
1332 list_for_each_entry(sdata, &local->interfaces, list) {
1333 if (sdata->vif.type != NL80211_IFTYPE_AP)
1334 continue;
1335 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1336 break;
1337 }
1338 /* keep default if no AP interface present */
1339 break;
1340 case NL80211_IFTYPE_P2P_CLIENT:
1341 case NL80211_IFTYPE_P2P_GO:
1342 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1343 list_for_each_entry(sdata, &local->interfaces, list) {
1344 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1345 continue;
1346 if (!ieee80211_sdata_running(sdata))
1347 continue;
1348 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1349 goto out_unlock;
1350 }
1351 }
1352 /* otherwise fall through */
1353 default:
1354 /* assign a new address if possible -- try n_addresses first */
1355 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1356 bool used = false;
1357
1358 list_for_each_entry(sdata, &local->interfaces, list) {
1359 if (memcmp(local->hw.wiphy->addresses[i].addr,
1360 sdata->vif.addr, ETH_ALEN) == 0) {
1361 used = true;
1362 break;
1363 }
1364 }
1365
1366 if (!used) {
1367 memcpy(perm_addr,
1368 local->hw.wiphy->addresses[i].addr,
1369 ETH_ALEN);
1370 break;
1371 }
1372 }
1373
1374 /* try mask if available */
1375 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1376 break;
1377
1378 m = local->hw.wiphy->addr_mask;
1379 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1380 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1381 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1382
1383 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1384 /* not a contiguous mask ... not handled now! */
1385 pr_info("not contiguous\n");
1386 break;
1387 }
1388
1389 m = local->hw.wiphy->perm_addr;
1390 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1391 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1392 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1393
1394 inc = 1ULL<<__ffs64(mask);
1395 val = (start & mask);
1396 addr = (start & ~mask) | (val & mask);
1397 do {
1398 bool used = false;
1399
1400 tmp_addr[5] = addr >> 0*8;
1401 tmp_addr[4] = addr >> 1*8;
1402 tmp_addr[3] = addr >> 2*8;
1403 tmp_addr[2] = addr >> 3*8;
1404 tmp_addr[1] = addr >> 4*8;
1405 tmp_addr[0] = addr >> 5*8;
1406
1407 val += inc;
1408
1409 list_for_each_entry(sdata, &local->interfaces, list) {
1410 if (memcmp(tmp_addr, sdata->vif.addr,
1411 ETH_ALEN) == 0) {
1412 used = true;
1413 break;
1414 }
1415 }
1416
1417 if (!used) {
1418 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1419 break;
1420 }
1421 addr = (start & ~mask) | (val & mask);
1422 } while (addr != start);
1423
1424 break;
1425 }
1426
1427 out_unlock:
1428 mutex_unlock(&local->iflist_mtx);
1429 }
1430
1431 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1432 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1433 struct vif_params *params)
1434 {
1435 struct net_device *ndev = NULL;
1436 struct ieee80211_sub_if_data *sdata = NULL;
1437 int ret, i;
1438 int txqs = 1;
1439
1440 ASSERT_RTNL();
1441
1442 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1443 struct wireless_dev *wdev;
1444
1445 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1446 GFP_KERNEL);
1447 if (!sdata)
1448 return -ENOMEM;
1449 wdev = &sdata->wdev;
1450
1451 sdata->dev = NULL;
1452 strlcpy(sdata->name, name, IFNAMSIZ);
1453 ieee80211_assign_perm_addr(local, wdev->address, type);
1454 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1455 } else {
1456 if (local->hw.queues >= IEEE80211_NUM_ACS)
1457 txqs = IEEE80211_NUM_ACS;
1458
1459 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1460 local->hw.vif_data_size,
1461 name, ieee80211_if_setup, txqs, 1);
1462 if (!ndev)
1463 return -ENOMEM;
1464 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1465
1466 ndev->needed_headroom = local->tx_headroom +
1467 4*6 /* four MAC addresses */
1468 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1469 + 6 /* mesh */
1470 + 8 /* rfc1042/bridge tunnel */
1471 - ETH_HLEN /* ethernet hard_header_len */
1472 + IEEE80211_ENCRYPT_HEADROOM;
1473 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1474
1475 ret = dev_alloc_name(ndev, ndev->name);
1476 if (ret < 0) {
1477 free_netdev(ndev);
1478 return ret;
1479 }
1480
1481 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1482 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1483 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1484
1485 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1486 sdata = netdev_priv(ndev);
1487 ndev->ieee80211_ptr = &sdata->wdev;
1488 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1489 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1490
1491 sdata->dev = ndev;
1492 }
1493
1494 /* initialise type-independent data */
1495 sdata->wdev.wiphy = local->hw.wiphy;
1496 sdata->local = local;
1497 #ifdef CONFIG_INET
1498 sdata->arp_filter_state = true;
1499 #endif
1500
1501 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1502 skb_queue_head_init(&sdata->fragments[i].skb_list);
1503
1504 INIT_LIST_HEAD(&sdata->key_list);
1505
1506 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1507 struct ieee80211_supported_band *sband;
1508 sband = local->hw.wiphy->bands[i];
1509 sdata->rc_rateidx_mask[i] =
1510 sband ? (1 << sband->n_bitrates) - 1 : 0;
1511 if (sband)
1512 memcpy(sdata->rc_rateidx_mcs_mask[i],
1513 sband->ht_cap.mcs.rx_mask,
1514 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1515 else
1516 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1517 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1518 }
1519
1520 ieee80211_set_default_queues(sdata);
1521
1522 /* setup type-dependent data */
1523 ieee80211_setup_sdata(sdata, type);
1524
1525 if (ndev) {
1526 if (params) {
1527 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1528 if (type == NL80211_IFTYPE_STATION)
1529 sdata->u.mgd.use_4addr = params->use_4addr;
1530 }
1531
1532 ndev->features |= local->hw.netdev_features;
1533
1534 ret = register_netdevice(ndev);
1535 if (ret) {
1536 free_netdev(ndev);
1537 return ret;
1538 }
1539 }
1540
1541 mutex_lock(&local->iflist_mtx);
1542 list_add_tail_rcu(&sdata->list, &local->interfaces);
1543 mutex_unlock(&local->iflist_mtx);
1544
1545 if (new_wdev)
1546 *new_wdev = &sdata->wdev;
1547
1548 return 0;
1549 }
1550
1551 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1552 {
1553 ASSERT_RTNL();
1554
1555 mutex_lock(&sdata->local->iflist_mtx);
1556 list_del_rcu(&sdata->list);
1557 mutex_unlock(&sdata->local->iflist_mtx);
1558
1559 synchronize_rcu();
1560
1561 if (sdata->dev) {
1562 unregister_netdevice(sdata->dev);
1563 } else {
1564 cfg80211_unregister_wdev(&sdata->wdev);
1565 kfree(sdata);
1566 }
1567 }
1568
1569 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1570 {
1571 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1572 return;
1573 ieee80211_do_stop(sdata, true);
1574 ieee80211_teardown_sdata(sdata);
1575 }
1576
1577 /*
1578 * Remove all interfaces, may only be called at hardware unregistration
1579 * time because it doesn't do RCU-safe list removals.
1580 */
1581 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1582 {
1583 struct ieee80211_sub_if_data *sdata, *tmp;
1584 LIST_HEAD(unreg_list);
1585 LIST_HEAD(wdev_list);
1586
1587 ASSERT_RTNL();
1588
1589 mutex_lock(&local->iflist_mtx);
1590 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1591 list_del(&sdata->list);
1592
1593 if (sdata->dev)
1594 unregister_netdevice_queue(sdata->dev, &unreg_list);
1595 else
1596 list_add(&sdata->list, &wdev_list);
1597 }
1598 mutex_unlock(&local->iflist_mtx);
1599 unregister_netdevice_many(&unreg_list);
1600 list_del(&unreg_list);
1601
1602 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1603 list_del(&sdata->list);
1604 cfg80211_unregister_wdev(&sdata->wdev);
1605 kfree(sdata);
1606 }
1607 }
1608
1609 static int netdev_notify(struct notifier_block *nb,
1610 unsigned long state,
1611 void *ndev)
1612 {
1613 struct net_device *dev = ndev;
1614 struct ieee80211_sub_if_data *sdata;
1615
1616 if (state != NETDEV_CHANGENAME)
1617 return 0;
1618
1619 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1620 return 0;
1621
1622 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1623 return 0;
1624
1625 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1626
1627 memcpy(sdata->name, dev->name, IFNAMSIZ);
1628
1629 ieee80211_debugfs_rename_netdev(sdata);
1630 return 0;
1631 }
1632
1633 static struct notifier_block mac80211_netdev_notifier = {
1634 .notifier_call = netdev_notify,
1635 };
1636
1637 int ieee80211_iface_init(void)
1638 {
1639 return register_netdevice_notifier(&mac80211_netdev_notifier);
1640 }
1641
1642 void ieee80211_iface_exit(void)
1643 {
1644 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1645 }
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