1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Interface handling
4 *
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright (c) 2016 Intel Deutschland GmbH
11 * Copyright (C) 2018-2021 Intel Corporation
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 <linux/kcov.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
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)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.bss_conf.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
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)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
__ieee80211_idle_off(struct ieee80211_local * local)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
__ieee80211_idle_on(struct ieee80211_local * local)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
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)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
ieee80211_idle_off(struct ieee80211_local * local)141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
ieee80211_recalc_idle(struct ieee80211_local * local)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
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
154 bool check_dup)
155 {
156 struct ieee80211_local *local = sdata->local;
157 struct ieee80211_sub_if_data *iter;
158 u64 new, mask, tmp;
159 u8 *m;
160 int ret = 0;
161
162 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
163 return 0;
164
165 m = addr;
166 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
167 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
168 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
169
170 m = local->hw.wiphy->addr_mask;
171 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174
175 if (!check_dup)
176 return ret;
177
178 mutex_lock(&local->iflist_mtx);
179 list_for_each_entry(iter, &local->interfaces, list) {
180 if (iter == sdata)
181 continue;
182
183 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
184 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
185 continue;
186
187 m = iter->vif.addr;
188 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
189 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
190 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
191
192 if ((new & ~mask) != (tmp & ~mask)) {
193 ret = -EINVAL;
194 break;
195 }
196 }
197 mutex_unlock(&local->iflist_mtx);
198
199 return ret;
200 }
201
ieee80211_change_mac(struct net_device * dev,void * addr)202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
203 {
204 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
205 struct sockaddr *sa = addr;
206 bool check_dup = true;
207 int ret;
208
209 if (ieee80211_sdata_running(sdata))
210 return -EBUSY;
211
212 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
213 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
214 check_dup = false;
215
216 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
217 if (ret)
218 return ret;
219
220 ret = eth_mac_addr(dev, sa);
221
222 if (ret == 0)
223 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
224
225 return ret;
226 }
227
identical_mac_addr_allowed(int type1,int type2)228 static inline int identical_mac_addr_allowed(int type1, int type2)
229 {
230 return type1 == NL80211_IFTYPE_MONITOR ||
231 type2 == NL80211_IFTYPE_MONITOR ||
232 type1 == NL80211_IFTYPE_P2P_DEVICE ||
233 type2 == NL80211_IFTYPE_P2P_DEVICE ||
234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
235 (type1 == NL80211_IFTYPE_AP_VLAN &&
236 (type2 == NL80211_IFTYPE_AP ||
237 type2 == NL80211_IFTYPE_AP_VLAN));
238 }
239
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
241 enum nl80211_iftype iftype)
242 {
243 struct ieee80211_local *local = sdata->local;
244 struct ieee80211_sub_if_data *nsdata;
245 int ret;
246
247 ASSERT_RTNL();
248
249 /* we hold the RTNL here so can safely walk the list */
250 list_for_each_entry(nsdata, &local->interfaces, list) {
251 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
252 /*
253 * Only OCB and monitor mode may coexist
254 */
255 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
256 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
257 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
258 nsdata->vif.type == NL80211_IFTYPE_OCB))
259 return -EBUSY;
260
261 /*
262 * Allow only a single IBSS interface to be up at any
263 * time. This is restricted because beacon distribution
264 * cannot work properly if both are in the same IBSS.
265 *
266 * To remove this restriction we'd have to disallow them
267 * from setting the same SSID on different IBSS interfaces
268 * belonging to the same hardware. Then, however, we're
269 * faced with having to adopt two different TSF timers...
270 */
271 if (iftype == NL80211_IFTYPE_ADHOC &&
272 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
273 return -EBUSY;
274 /*
275 * will not add another interface while any channel
276 * switch is active.
277 */
278 if (nsdata->vif.bss_conf.csa_active)
279 return -EBUSY;
280
281 /*
282 * The remaining checks are only performed for interfaces
283 * with the same MAC address.
284 */
285 if (!ether_addr_equal(sdata->vif.addr,
286 nsdata->vif.addr))
287 continue;
288
289 /*
290 * check whether it may have the same address
291 */
292 if (!identical_mac_addr_allowed(iftype,
293 nsdata->vif.type))
294 return -ENOTUNIQ;
295
296 /*
297 * can only add VLANs to enabled APs
298 */
299 if (iftype == NL80211_IFTYPE_AP_VLAN &&
300 nsdata->vif.type == NL80211_IFTYPE_AP)
301 sdata->bss = &nsdata->u.ap;
302 }
303 }
304
305 mutex_lock(&local->chanctx_mtx);
306 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
307 mutex_unlock(&local->chanctx_mtx);
308 return ret;
309 }
310
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype == NL80211_IFTYPE_NAN)
318 return 0;
319
320 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
321 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
323 IEEE80211_INVAL_HW_QUEUE))
324 return -EINVAL;
325 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
326 n_queues))
327 return -EINVAL;
328 }
329 }
330
331 if ((iftype != NL80211_IFTYPE_AP &&
332 iftype != NL80211_IFTYPE_P2P_GO &&
333 iftype != NL80211_IFTYPE_MESH_POINT) ||
334 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
335 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
336 return 0;
337 }
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
340 return -EINVAL;
341
342 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
343 return -EINVAL;
344
345 return 0;
346 }
347
ieee80211_open(struct net_device * dev)348 static int ieee80211_open(struct net_device *dev)
349 {
350 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
351 int err;
352
353 /* fail early if user set an invalid address */
354 if (!is_valid_ether_addr(dev->dev_addr))
355 return -EADDRNOTAVAIL;
356
357 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
358 if (err)
359 return err;
360
361 wiphy_lock(sdata->local->hw.wiphy);
362 err = ieee80211_do_open(&sdata->wdev, true);
363 wiphy_unlock(sdata->local->hw.wiphy);
364
365 return err;
366 }
367
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
369 {
370 struct ieee80211_local *local = sdata->local;
371 unsigned long flags;
372 struct sk_buff *skb, *tmp;
373 u32 hw_reconf_flags = 0;
374 int i, flushed;
375 struct ps_data *ps;
376 struct cfg80211_chan_def chandef;
377 bool cancel_scan;
378 struct cfg80211_nan_func *func;
379
380 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
381 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
382
383 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
384 if (cancel_scan)
385 ieee80211_scan_cancel(local);
386
387 /*
388 * Stop TX on this interface first.
389 */
390 if (sdata->dev)
391 netif_tx_stop_all_queues(sdata->dev);
392
393 ieee80211_roc_purge(local, sdata);
394
395 switch (sdata->vif.type) {
396 case NL80211_IFTYPE_STATION:
397 ieee80211_mgd_stop(sdata);
398 break;
399 case NL80211_IFTYPE_ADHOC:
400 ieee80211_ibss_stop(sdata);
401 break;
402 case NL80211_IFTYPE_MONITOR:
403 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
404 break;
405 list_del_rcu(&sdata->u.mntr.list);
406 break;
407 default:
408 break;
409 }
410
411 /*
412 * Remove all stations associated with this interface.
413 *
414 * This must be done before calling ops->remove_interface()
415 * because otherwise we can later invoke ops->sta_notify()
416 * whenever the STAs are removed, and that invalidates driver
417 * assumptions about always getting a vif pointer that is valid
418 * (because if we remove a STA after ops->remove_interface()
419 * the driver will have removed the vif info already!)
420 *
421 * For AP_VLANs stations may exist since there's nothing else that
422 * would have removed them, but in other modes there shouldn't
423 * be any stations.
424 */
425 flushed = sta_info_flush(sdata);
426 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
427
428 /* don't count this interface for allmulti while it is down */
429 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
430 atomic_dec(&local->iff_allmultis);
431
432 if (sdata->vif.type == NL80211_IFTYPE_AP) {
433 local->fif_pspoll--;
434 local->fif_probe_req--;
435 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
436 local->fif_probe_req--;
437 }
438
439 if (sdata->dev) {
440 netif_addr_lock_bh(sdata->dev);
441 spin_lock_bh(&local->filter_lock);
442 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
443 sdata->dev->addr_len);
444 spin_unlock_bh(&local->filter_lock);
445 netif_addr_unlock_bh(sdata->dev);
446 }
447
448 del_timer_sync(&local->dynamic_ps_timer);
449 cancel_work_sync(&local->dynamic_ps_enable_work);
450
451 cancel_work_sync(&sdata->recalc_smps);
452 sdata_lock(sdata);
453 mutex_lock(&local->mtx);
454 sdata->vif.bss_conf.csa_active = false;
455 if (sdata->vif.type == NL80211_IFTYPE_STATION)
456 sdata->u.mgd.csa_waiting_bcn = false;
457 if (sdata->csa_block_tx) {
458 ieee80211_wake_vif_queues(local, sdata,
459 IEEE80211_QUEUE_STOP_REASON_CSA);
460 sdata->csa_block_tx = false;
461 }
462 mutex_unlock(&local->mtx);
463 sdata_unlock(sdata);
464
465 cancel_work_sync(&sdata->csa_finalize_work);
466 cancel_work_sync(&sdata->color_change_finalize_work);
467
468 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
469
470 if (sdata->wdev.cac_started) {
471 chandef = sdata->vif.bss_conf.chandef;
472 WARN_ON(local->suspended);
473 mutex_lock(&local->mtx);
474 ieee80211_vif_release_channel(sdata);
475 mutex_unlock(&local->mtx);
476 cfg80211_cac_event(sdata->dev, &chandef,
477 NL80211_RADAR_CAC_ABORTED,
478 GFP_KERNEL);
479 }
480
481 if (sdata->vif.type == NL80211_IFTYPE_AP) {
482 WARN_ON(!list_empty(&sdata->u.ap.vlans));
483 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
484 /* remove all packets in parent bc_buf pointing to this dev */
485 ps = &sdata->bss->ps;
486
487 spin_lock_irqsave(&ps->bc_buf.lock, flags);
488 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
489 if (skb->dev == sdata->dev) {
490 __skb_unlink(skb, &ps->bc_buf);
491 local->total_ps_buffered--;
492 ieee80211_free_txskb(&local->hw, skb);
493 }
494 }
495 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
496 }
497
498 if (going_down)
499 local->open_count--;
500
501 switch (sdata->vif.type) {
502 case NL80211_IFTYPE_AP_VLAN:
503 mutex_lock(&local->mtx);
504 list_del(&sdata->u.vlan.list);
505 mutex_unlock(&local->mtx);
506 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
507 /* see comment in the default case below */
508 ieee80211_free_keys(sdata, true);
509 /* no need to tell driver */
510 break;
511 case NL80211_IFTYPE_MONITOR:
512 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
513 local->cooked_mntrs--;
514 break;
515 }
516
517 local->monitors--;
518 if (local->monitors == 0) {
519 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
520 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
521 }
522
523 ieee80211_adjust_monitor_flags(sdata, -1);
524 break;
525 case NL80211_IFTYPE_NAN:
526 /* clean all the functions */
527 spin_lock_bh(&sdata->u.nan.func_lock);
528
529 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
530 idr_remove(&sdata->u.nan.function_inst_ids, i);
531 cfg80211_free_nan_func(func);
532 }
533 idr_destroy(&sdata->u.nan.function_inst_ids);
534
535 spin_unlock_bh(&sdata->u.nan.func_lock);
536 break;
537 case NL80211_IFTYPE_P2P_DEVICE:
538 /* relies on synchronize_rcu() below */
539 RCU_INIT_POINTER(local->p2p_sdata, NULL);
540 fallthrough;
541 default:
542 cancel_work_sync(&sdata->work);
543 /*
544 * When we get here, the interface is marked down.
545 * Free the remaining keys, if there are any
546 * (which can happen in AP mode if userspace sets
547 * keys before the interface is operating)
548 *
549 * Force the key freeing to always synchronize_net()
550 * to wait for the RX path in case it is using this
551 * interface enqueuing frames at this very time on
552 * another CPU.
553 */
554 ieee80211_free_keys(sdata, true);
555 skb_queue_purge(&sdata->skb_queue);
556 skb_queue_purge(&sdata->status_queue);
557 }
558
559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
560 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
561 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
562 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
563 if (info->control.vif == &sdata->vif) {
564 __skb_unlink(skb, &local->pending[i]);
565 ieee80211_free_txskb(&local->hw, skb);
566 }
567 }
568 }
569 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
570
571 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
572 ieee80211_txq_remove_vlan(local, sdata);
573
574 sdata->bss = NULL;
575
576 if (local->open_count == 0)
577 ieee80211_clear_tx_pending(local);
578
579 sdata->vif.bss_conf.beacon_int = 0;
580
581 /*
582 * If the interface goes down while suspended, presumably because
583 * the device was unplugged and that happens before our resume,
584 * then the driver is already unconfigured and the remainder of
585 * this function isn't needed.
586 * XXX: what about WoWLAN? If the device has software state, e.g.
587 * memory allocated, it might expect teardown commands from
588 * mac80211 here?
589 */
590 if (local->suspended) {
591 WARN_ON(local->wowlan);
592 WARN_ON(rcu_access_pointer(local->monitor_sdata));
593 return;
594 }
595
596 switch (sdata->vif.type) {
597 case NL80211_IFTYPE_AP_VLAN:
598 break;
599 case NL80211_IFTYPE_MONITOR:
600 if (local->monitors == 0)
601 ieee80211_del_virtual_monitor(local);
602
603 mutex_lock(&local->mtx);
604 ieee80211_recalc_idle(local);
605 mutex_unlock(&local->mtx);
606
607 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
608 break;
609
610 fallthrough;
611 default:
612 if (going_down)
613 drv_remove_interface(local, sdata);
614 }
615
616 ieee80211_recalc_ps(local);
617
618 if (cancel_scan)
619 flush_delayed_work(&local->scan_work);
620
621 if (local->open_count == 0) {
622 ieee80211_stop_device(local);
623
624 /* no reconfiguring after stop! */
625 return;
626 }
627
628 /* do after stop to avoid reconfiguring when we stop anyway */
629 ieee80211_configure_filter(local);
630 ieee80211_hw_config(local, hw_reconf_flags);
631
632 if (local->monitors == local->open_count)
633 ieee80211_add_virtual_monitor(local);
634 }
635
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)636 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
637 {
638 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
639 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
640
641 if (!tx_vif)
642 return;
643
644 tx_sdata = vif_to_sdata(tx_vif);
645 sdata->vif.mbssid_tx_vif = NULL;
646
647 list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
648 &tx_sdata->local->interfaces, list) {
649 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
650 non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
651 ieee80211_sdata_running(non_tx_sdata)) {
652 non_tx_sdata->vif.mbssid_tx_vif = NULL;
653 dev_close(non_tx_sdata->wdev.netdev);
654 }
655 }
656
657 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
658 tx_sdata->vif.mbssid_tx_vif = NULL;
659 dev_close(tx_sdata->wdev.netdev);
660 }
661 }
662
ieee80211_stop(struct net_device * dev)663 static int ieee80211_stop(struct net_device *dev)
664 {
665 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
666
667 /* close dependent VLAN and MBSSID interfaces before locking wiphy */
668 if (sdata->vif.type == NL80211_IFTYPE_AP) {
669 struct ieee80211_sub_if_data *vlan, *tmpsdata;
670
671 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
672 u.vlan.list)
673 dev_close(vlan->dev);
674
675 ieee80211_stop_mbssid(sdata);
676 }
677
678 wiphy_lock(sdata->local->hw.wiphy);
679 ieee80211_do_stop(sdata, true);
680 wiphy_unlock(sdata->local->hw.wiphy);
681
682 return 0;
683 }
684
ieee80211_set_multicast_list(struct net_device * dev)685 static void ieee80211_set_multicast_list(struct net_device *dev)
686 {
687 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
688 struct ieee80211_local *local = sdata->local;
689 int allmulti, sdata_allmulti;
690
691 allmulti = !!(dev->flags & IFF_ALLMULTI);
692 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
693
694 if (allmulti != sdata_allmulti) {
695 if (dev->flags & IFF_ALLMULTI)
696 atomic_inc(&local->iff_allmultis);
697 else
698 atomic_dec(&local->iff_allmultis);
699 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
700 }
701
702 spin_lock_bh(&local->filter_lock);
703 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
704 spin_unlock_bh(&local->filter_lock);
705 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
706 }
707
708 /*
709 * Called when the netdev is removed or, by the code below, before
710 * the interface type changes.
711 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)712 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
713 {
714 /* free extra data */
715 ieee80211_free_keys(sdata, false);
716
717 ieee80211_debugfs_remove_netdev(sdata);
718
719 ieee80211_destroy_frag_cache(&sdata->frags);
720
721 if (ieee80211_vif_is_mesh(&sdata->vif))
722 ieee80211_mesh_teardown_sdata(sdata);
723 }
724
ieee80211_uninit(struct net_device * dev)725 static void ieee80211_uninit(struct net_device *dev)
726 {
727 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
728 }
729
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)730 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
731 struct sk_buff *skb,
732 struct net_device *sb_dev)
733 {
734 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
735 }
736
737 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)738 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
739 {
740 dev_fetch_sw_netstats(stats, dev->tstats);
741 }
742
743 static const struct net_device_ops ieee80211_dataif_ops = {
744 .ndo_open = ieee80211_open,
745 .ndo_stop = ieee80211_stop,
746 .ndo_uninit = ieee80211_uninit,
747 .ndo_start_xmit = ieee80211_subif_start_xmit,
748 .ndo_set_rx_mode = ieee80211_set_multicast_list,
749 .ndo_set_mac_address = ieee80211_change_mac,
750 .ndo_select_queue = ieee80211_netdev_select_queue,
751 .ndo_get_stats64 = ieee80211_get_stats64,
752 };
753
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)754 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
755 struct sk_buff *skb,
756 struct net_device *sb_dev)
757 {
758 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
759 struct ieee80211_local *local = sdata->local;
760 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
761 struct ieee80211_hdr *hdr;
762 int len_rthdr;
763
764 if (local->hw.queues < IEEE80211_NUM_ACS)
765 return 0;
766
767 /* reset flags and info before parsing radiotap header */
768 memset(info, 0, sizeof(*info));
769
770 if (!ieee80211_parse_tx_radiotap(skb, dev))
771 return 0; /* doesn't matter, frame will be dropped */
772
773 len_rthdr = ieee80211_get_radiotap_len(skb->data);
774 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
775 if (skb->len < len_rthdr + 2 ||
776 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
777 return 0; /* doesn't matter, frame will be dropped */
778
779 return ieee80211_select_queue_80211(sdata, skb, hdr);
780 }
781
782 static const struct net_device_ops ieee80211_monitorif_ops = {
783 .ndo_open = ieee80211_open,
784 .ndo_stop = ieee80211_stop,
785 .ndo_uninit = ieee80211_uninit,
786 .ndo_start_xmit = ieee80211_monitor_start_xmit,
787 .ndo_set_rx_mode = ieee80211_set_multicast_list,
788 .ndo_set_mac_address = ieee80211_change_mac,
789 .ndo_select_queue = ieee80211_monitor_select_queue,
790 .ndo_get_stats64 = ieee80211_get_stats64,
791 };
792
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)793 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
794 struct net_device_path *path)
795 {
796 struct ieee80211_sub_if_data *sdata;
797 struct ieee80211_local *local;
798 struct sta_info *sta;
799 int ret = -ENOENT;
800
801 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
802 local = sdata->local;
803
804 if (!local->ops->net_fill_forward_path)
805 return -EOPNOTSUPP;
806
807 rcu_read_lock();
808 switch (sdata->vif.type) {
809 case NL80211_IFTYPE_AP_VLAN:
810 sta = rcu_dereference(sdata->u.vlan.sta);
811 if (sta)
812 break;
813 if (sdata->wdev.use_4addr)
814 goto out;
815 if (is_multicast_ether_addr(ctx->daddr))
816 goto out;
817 sta = sta_info_get_bss(sdata, ctx->daddr);
818 break;
819 case NL80211_IFTYPE_AP:
820 if (is_multicast_ether_addr(ctx->daddr))
821 goto out;
822 sta = sta_info_get(sdata, ctx->daddr);
823 break;
824 case NL80211_IFTYPE_STATION:
825 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
826 sta = sta_info_get(sdata, ctx->daddr);
827 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
828 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
829 goto out;
830
831 break;
832 }
833 }
834
835 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
836 break;
837 default:
838 goto out;
839 }
840
841 if (!sta)
842 goto out;
843
844 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
845 out:
846 rcu_read_unlock();
847
848 return ret;
849 }
850
851 static const struct net_device_ops ieee80211_dataif_8023_ops = {
852 .ndo_open = ieee80211_open,
853 .ndo_stop = ieee80211_stop,
854 .ndo_uninit = ieee80211_uninit,
855 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
856 .ndo_set_rx_mode = ieee80211_set_multicast_list,
857 .ndo_set_mac_address = ieee80211_change_mac,
858 .ndo_select_queue = ieee80211_netdev_select_queue,
859 .ndo_get_stats64 = ieee80211_get_stats64,
860 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
861 };
862
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)863 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
864 {
865 switch (iftype) {
866 /* P2P GO and client are mapped to AP/STATION types */
867 case NL80211_IFTYPE_AP:
868 case NL80211_IFTYPE_STATION:
869 return true;
870 default:
871 return false;
872 }
873 }
874
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)875 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
876 {
877 struct ieee80211_local *local = sdata->local;
878 u32 flags;
879
880 flags = sdata->vif.offload_flags;
881
882 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
883 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
884 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
885
886 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
887 local->hw.wiphy->frag_threshold != (u32)-1)
888 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
889
890 if (local->monitors)
891 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
892 } else {
893 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
894 }
895
896 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
897 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
898 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
899
900 if (local->monitors &&
901 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
902 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
903 } else {
904 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
905 }
906
907 if (sdata->vif.offload_flags == flags)
908 return false;
909
910 sdata->vif.offload_flags = flags;
911 ieee80211_check_fast_rx_iface(sdata);
912 return true;
913 }
914
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)915 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
916 {
917 struct ieee80211_local *local = sdata->local;
918 struct ieee80211_sub_if_data *bss = sdata;
919 bool enabled;
920
921 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
922 if (!sdata->bss)
923 return;
924
925 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
926 }
927
928 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
929 !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
930 return;
931
932 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
933 if (sdata->wdev.use_4addr &&
934 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
935 enabled = false;
936
937 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
938 &ieee80211_dataif_ops;
939 }
940
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)941 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
942 {
943 struct ieee80211_local *local = sdata->local;
944 struct ieee80211_sub_if_data *vsdata;
945
946 if (ieee80211_set_sdata_offload_flags(sdata)) {
947 drv_update_vif_offload(local, sdata);
948 ieee80211_set_vif_encap_ops(sdata);
949 }
950
951 list_for_each_entry(vsdata, &local->interfaces, list) {
952 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
953 vsdata->bss != &sdata->u.ap)
954 continue;
955
956 ieee80211_set_vif_encap_ops(vsdata);
957 }
958 }
959
ieee80211_recalc_offload(struct ieee80211_local * local)960 void ieee80211_recalc_offload(struct ieee80211_local *local)
961 {
962 struct ieee80211_sub_if_data *sdata;
963
964 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
965 return;
966
967 mutex_lock(&local->iflist_mtx);
968
969 list_for_each_entry(sdata, &local->interfaces, list) {
970 if (!ieee80211_sdata_running(sdata))
971 continue;
972
973 ieee80211_recalc_sdata_offload(sdata);
974 }
975
976 mutex_unlock(&local->iflist_mtx);
977 }
978
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)979 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
980 const int offset)
981 {
982 struct ieee80211_local *local = sdata->local;
983 u32 flags = sdata->u.mntr.flags;
984
985 #define ADJUST(_f, _s) do { \
986 if (flags & MONITOR_FLAG_##_f) \
987 local->fif_##_s += offset; \
988 } while (0)
989
990 ADJUST(FCSFAIL, fcsfail);
991 ADJUST(PLCPFAIL, plcpfail);
992 ADJUST(CONTROL, control);
993 ADJUST(CONTROL, pspoll);
994 ADJUST(OTHER_BSS, other_bss);
995
996 #undef ADJUST
997 }
998
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)999 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1000 {
1001 struct ieee80211_local *local = sdata->local;
1002 int i;
1003
1004 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1005 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1006 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1007 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1008 sdata->vif.hw_queue[i] = i;
1009 else
1010 sdata->vif.hw_queue[i] = 0;
1011 }
1012 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1013 }
1014
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1015 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1016 {
1017 struct ieee80211_sub_if_data *sdata;
1018 int ret;
1019
1020 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1021 return 0;
1022
1023 ASSERT_RTNL();
1024 lockdep_assert_wiphy(local->hw.wiphy);
1025
1026 if (local->monitor_sdata)
1027 return 0;
1028
1029 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1030 if (!sdata)
1031 return -ENOMEM;
1032
1033 /* set up data */
1034 sdata->local = local;
1035 sdata->vif.type = NL80211_IFTYPE_MONITOR;
1036 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1037 wiphy_name(local->hw.wiphy));
1038 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1039
1040 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1041
1042 ieee80211_set_default_queues(sdata);
1043
1044 ret = drv_add_interface(local, sdata);
1045 if (WARN_ON(ret)) {
1046 /* ok .. stupid driver, it asked for this! */
1047 kfree(sdata);
1048 return ret;
1049 }
1050
1051 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1052
1053 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1054 if (ret) {
1055 kfree(sdata);
1056 return ret;
1057 }
1058
1059 mutex_lock(&local->iflist_mtx);
1060 rcu_assign_pointer(local->monitor_sdata, sdata);
1061 mutex_unlock(&local->iflist_mtx);
1062
1063 mutex_lock(&local->mtx);
1064 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
1065 IEEE80211_CHANCTX_EXCLUSIVE);
1066 mutex_unlock(&local->mtx);
1067 if (ret) {
1068 mutex_lock(&local->iflist_mtx);
1069 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1070 mutex_unlock(&local->iflist_mtx);
1071 synchronize_net();
1072 drv_remove_interface(local, sdata);
1073 kfree(sdata);
1074 return ret;
1075 }
1076
1077 skb_queue_head_init(&sdata->skb_queue);
1078 skb_queue_head_init(&sdata->status_queue);
1079 INIT_WORK(&sdata->work, ieee80211_iface_work);
1080
1081 return 0;
1082 }
1083
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1084 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1085 {
1086 struct ieee80211_sub_if_data *sdata;
1087
1088 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1089 return;
1090
1091 ASSERT_RTNL();
1092 lockdep_assert_wiphy(local->hw.wiphy);
1093
1094 mutex_lock(&local->iflist_mtx);
1095
1096 sdata = rcu_dereference_protected(local->monitor_sdata,
1097 lockdep_is_held(&local->iflist_mtx));
1098 if (!sdata) {
1099 mutex_unlock(&local->iflist_mtx);
1100 return;
1101 }
1102
1103 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1104 mutex_unlock(&local->iflist_mtx);
1105
1106 synchronize_net();
1107
1108 mutex_lock(&local->mtx);
1109 ieee80211_vif_release_channel(sdata);
1110 mutex_unlock(&local->mtx);
1111
1112 drv_remove_interface(local, sdata);
1113
1114 kfree(sdata);
1115 }
1116
1117 /*
1118 * NOTE: Be very careful when changing this function, it must NOT return
1119 * an error on interface type changes that have been pre-checked, so most
1120 * checks should be in ieee80211_check_concurrent_iface.
1121 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1122 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1123 {
1124 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1125 struct net_device *dev = wdev->netdev;
1126 struct ieee80211_local *local = sdata->local;
1127 u32 changed = 0;
1128 int res;
1129 u32 hw_reconf_flags = 0;
1130
1131 switch (sdata->vif.type) {
1132 case NL80211_IFTYPE_AP_VLAN: {
1133 struct ieee80211_sub_if_data *master;
1134
1135 if (!sdata->bss)
1136 return -ENOLINK;
1137
1138 mutex_lock(&local->mtx);
1139 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1140 mutex_unlock(&local->mtx);
1141
1142 master = container_of(sdata->bss,
1143 struct ieee80211_sub_if_data, u.ap);
1144 sdata->control_port_protocol =
1145 master->control_port_protocol;
1146 sdata->control_port_no_encrypt =
1147 master->control_port_no_encrypt;
1148 sdata->control_port_over_nl80211 =
1149 master->control_port_over_nl80211;
1150 sdata->control_port_no_preauth =
1151 master->control_port_no_preauth;
1152 sdata->vif.cab_queue = master->vif.cab_queue;
1153 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1154 sizeof(sdata->vif.hw_queue));
1155 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1156
1157 mutex_lock(&local->key_mtx);
1158 sdata->crypto_tx_tailroom_needed_cnt +=
1159 master->crypto_tx_tailroom_needed_cnt;
1160 mutex_unlock(&local->key_mtx);
1161
1162 break;
1163 }
1164 case NL80211_IFTYPE_AP:
1165 sdata->bss = &sdata->u.ap;
1166 break;
1167 case NL80211_IFTYPE_MESH_POINT:
1168 case NL80211_IFTYPE_STATION:
1169 case NL80211_IFTYPE_MONITOR:
1170 case NL80211_IFTYPE_ADHOC:
1171 case NL80211_IFTYPE_P2P_DEVICE:
1172 case NL80211_IFTYPE_OCB:
1173 case NL80211_IFTYPE_NAN:
1174 /* no special treatment */
1175 break;
1176 case NL80211_IFTYPE_UNSPECIFIED:
1177 case NUM_NL80211_IFTYPES:
1178 case NL80211_IFTYPE_P2P_CLIENT:
1179 case NL80211_IFTYPE_P2P_GO:
1180 case NL80211_IFTYPE_WDS:
1181 /* cannot happen */
1182 WARN_ON(1);
1183 break;
1184 }
1185
1186 if (local->open_count == 0) {
1187 res = drv_start(local);
1188 if (res)
1189 goto err_del_bss;
1190 /* we're brought up, everything changes */
1191 hw_reconf_flags = ~0;
1192 ieee80211_led_radio(local, true);
1193 ieee80211_mod_tpt_led_trig(local,
1194 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1195 }
1196
1197 /*
1198 * Copy the hopefully now-present MAC address to
1199 * this interface, if it has the special null one.
1200 */
1201 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1202 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1203 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1204
1205 if (!is_valid_ether_addr(dev->dev_addr)) {
1206 res = -EADDRNOTAVAIL;
1207 goto err_stop;
1208 }
1209 }
1210
1211 switch (sdata->vif.type) {
1212 case NL80211_IFTYPE_AP_VLAN:
1213 /* no need to tell driver, but set carrier and chanctx */
1214 if (rtnl_dereference(sdata->bss->beacon)) {
1215 ieee80211_vif_vlan_copy_chanctx(sdata);
1216 netif_carrier_on(dev);
1217 ieee80211_set_vif_encap_ops(sdata);
1218 } else {
1219 netif_carrier_off(dev);
1220 }
1221 break;
1222 case NL80211_IFTYPE_MONITOR:
1223 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1224 local->cooked_mntrs++;
1225 break;
1226 }
1227
1228 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1229 res = drv_add_interface(local, sdata);
1230 if (res)
1231 goto err_stop;
1232 } else if (local->monitors == 0 && local->open_count == 0) {
1233 res = ieee80211_add_virtual_monitor(local);
1234 if (res)
1235 goto err_stop;
1236 }
1237
1238 /* must be before the call to ieee80211_configure_filter */
1239 local->monitors++;
1240 if (local->monitors == 1) {
1241 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1242 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1243 }
1244
1245 ieee80211_adjust_monitor_flags(sdata, 1);
1246 ieee80211_configure_filter(local);
1247 ieee80211_recalc_offload(local);
1248 mutex_lock(&local->mtx);
1249 ieee80211_recalc_idle(local);
1250 mutex_unlock(&local->mtx);
1251
1252 netif_carrier_on(dev);
1253 break;
1254 default:
1255 if (coming_up) {
1256 ieee80211_del_virtual_monitor(local);
1257 ieee80211_set_sdata_offload_flags(sdata);
1258
1259 res = drv_add_interface(local, sdata);
1260 if (res)
1261 goto err_stop;
1262
1263 ieee80211_set_vif_encap_ops(sdata);
1264 res = ieee80211_check_queues(sdata,
1265 ieee80211_vif_type_p2p(&sdata->vif));
1266 if (res)
1267 goto err_del_interface;
1268 }
1269
1270 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1271 local->fif_pspoll++;
1272 local->fif_probe_req++;
1273
1274 ieee80211_configure_filter(local);
1275 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1276 local->fif_probe_req++;
1277 }
1278
1279 if (sdata->vif.probe_req_reg)
1280 drv_config_iface_filter(local, sdata,
1281 FIF_PROBE_REQ,
1282 FIF_PROBE_REQ);
1283
1284 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1285 sdata->vif.type != NL80211_IFTYPE_NAN)
1286 changed |= ieee80211_reset_erp_info(sdata);
1287 ieee80211_bss_info_change_notify(sdata, changed);
1288
1289 switch (sdata->vif.type) {
1290 case NL80211_IFTYPE_STATION:
1291 case NL80211_IFTYPE_ADHOC:
1292 case NL80211_IFTYPE_AP:
1293 case NL80211_IFTYPE_MESH_POINT:
1294 case NL80211_IFTYPE_OCB:
1295 netif_carrier_off(dev);
1296 break;
1297 case NL80211_IFTYPE_P2P_DEVICE:
1298 case NL80211_IFTYPE_NAN:
1299 break;
1300 default:
1301 /* not reached */
1302 WARN_ON(1);
1303 }
1304
1305 /*
1306 * Set default queue parameters so drivers don't
1307 * need to initialise the hardware if the hardware
1308 * doesn't start up with sane defaults.
1309 * Enable QoS for anything but station interfaces.
1310 */
1311 ieee80211_set_wmm_default(sdata, true,
1312 sdata->vif.type != NL80211_IFTYPE_STATION);
1313 }
1314
1315 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1316
1317 switch (sdata->vif.type) {
1318 case NL80211_IFTYPE_P2P_DEVICE:
1319 rcu_assign_pointer(local->p2p_sdata, sdata);
1320 break;
1321 case NL80211_IFTYPE_MONITOR:
1322 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1323 break;
1324 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1325 break;
1326 default:
1327 break;
1328 }
1329
1330 /*
1331 * set_multicast_list will be invoked by the networking core
1332 * which will check whether any increments here were done in
1333 * error and sync them down to the hardware as filter flags.
1334 */
1335 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1336 atomic_inc(&local->iff_allmultis);
1337
1338 if (coming_up)
1339 local->open_count++;
1340
1341 if (hw_reconf_flags)
1342 ieee80211_hw_config(local, hw_reconf_flags);
1343
1344 ieee80211_recalc_ps(local);
1345
1346 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1347 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1348 local->ops->wake_tx_queue) {
1349 /* XXX: for AP_VLAN, actually track AP queues */
1350 if (dev)
1351 netif_tx_start_all_queues(dev);
1352 } else if (dev) {
1353 unsigned long flags;
1354 int n_acs = IEEE80211_NUM_ACS;
1355 int ac;
1356
1357 if (local->hw.queues < IEEE80211_NUM_ACS)
1358 n_acs = 1;
1359
1360 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1361 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1362 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1363 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1364 for (ac = 0; ac < n_acs; ac++) {
1365 int ac_queue = sdata->vif.hw_queue[ac];
1366
1367 if (local->queue_stop_reasons[ac_queue] == 0 &&
1368 skb_queue_empty(&local->pending[ac_queue]))
1369 netif_start_subqueue(dev, ac);
1370 }
1371 }
1372 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1373 }
1374
1375 return 0;
1376 err_del_interface:
1377 drv_remove_interface(local, sdata);
1378 err_stop:
1379 if (!local->open_count)
1380 drv_stop(local);
1381 err_del_bss:
1382 sdata->bss = NULL;
1383 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1384 mutex_lock(&local->mtx);
1385 list_del(&sdata->u.vlan.list);
1386 mutex_unlock(&local->mtx);
1387 }
1388 /* might already be clear but that doesn't matter */
1389 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1390 return res;
1391 }
1392
ieee80211_if_free(struct net_device * dev)1393 static void ieee80211_if_free(struct net_device *dev)
1394 {
1395 free_percpu(dev->tstats);
1396 }
1397
ieee80211_if_setup(struct net_device * dev)1398 static void ieee80211_if_setup(struct net_device *dev)
1399 {
1400 ether_setup(dev);
1401 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1402 dev->netdev_ops = &ieee80211_dataif_ops;
1403 dev->needs_free_netdev = true;
1404 dev->priv_destructor = ieee80211_if_free;
1405 }
1406
ieee80211_if_setup_no_queue(struct net_device * dev)1407 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1408 {
1409 ieee80211_if_setup(dev);
1410 dev->priv_flags |= IFF_NO_QUEUE;
1411 }
1412
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1413 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1414 struct ieee80211_sub_if_data *sdata,
1415 struct sk_buff *skb)
1416 {
1417 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1418
1419 if (ieee80211_is_action(mgmt->frame_control) &&
1420 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1421 struct sta_info *sta;
1422 int len = skb->len;
1423
1424 mutex_lock(&local->sta_mtx);
1425 sta = sta_info_get_bss(sdata, mgmt->sa);
1426 if (sta) {
1427 switch (mgmt->u.action.u.addba_req.action_code) {
1428 case WLAN_ACTION_ADDBA_REQ:
1429 ieee80211_process_addba_request(local, sta,
1430 mgmt, len);
1431 break;
1432 case WLAN_ACTION_ADDBA_RESP:
1433 ieee80211_process_addba_resp(local, sta,
1434 mgmt, len);
1435 break;
1436 case WLAN_ACTION_DELBA:
1437 ieee80211_process_delba(sdata, sta,
1438 mgmt, len);
1439 break;
1440 default:
1441 WARN_ON(1);
1442 break;
1443 }
1444 }
1445 mutex_unlock(&local->sta_mtx);
1446 } else if (ieee80211_is_action(mgmt->frame_control) &&
1447 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1448 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1449 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1450 struct ieee80211_rx_status *status;
1451 enum nl80211_band band;
1452 struct sta_info *sta;
1453 u8 opmode;
1454
1455 status = IEEE80211_SKB_RXCB(skb);
1456 band = status->band;
1457 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1458
1459 mutex_lock(&local->sta_mtx);
1460 sta = sta_info_get_bss(sdata, mgmt->sa);
1461
1462 if (sta)
1463 ieee80211_vht_handle_opmode(sdata, sta, opmode,
1464 band);
1465
1466 mutex_unlock(&local->sta_mtx);
1467 break;
1468 }
1469 case WLAN_VHT_ACTION_GROUPID_MGMT:
1470 ieee80211_process_mu_groups(sdata, mgmt);
1471 break;
1472 default:
1473 WARN_ON(1);
1474 break;
1475 }
1476 } else if (ieee80211_is_action(mgmt->frame_control) &&
1477 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1478 switch (mgmt->u.action.u.s1g.action_code) {
1479 case WLAN_S1G_TWT_TEARDOWN:
1480 case WLAN_S1G_TWT_SETUP:
1481 ieee80211_s1g_rx_twt_action(sdata, skb);
1482 break;
1483 default:
1484 break;
1485 }
1486 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1487 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1488 ieee80211_sta_rx_queued_ext(sdata, skb);
1489 else
1490 WARN_ON(1);
1491 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1492 struct ieee80211_hdr *hdr = (void *)mgmt;
1493 struct sta_info *sta;
1494
1495 /*
1496 * So the frame isn't mgmt, but frame_control
1497 * is at the right place anyway, of course, so
1498 * the if statement is correct.
1499 *
1500 * Warn if we have other data frame types here,
1501 * they must not get here.
1502 */
1503 WARN_ON(hdr->frame_control &
1504 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1505 WARN_ON(!(hdr->seq_ctrl &
1506 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1507 /*
1508 * This was a fragment of a frame, received while
1509 * a block-ack session was active. That cannot be
1510 * right, so terminate the session.
1511 */
1512 mutex_lock(&local->sta_mtx);
1513 sta = sta_info_get_bss(sdata, mgmt->sa);
1514 if (sta) {
1515 u16 tid = ieee80211_get_tid(hdr);
1516
1517 __ieee80211_stop_rx_ba_session(
1518 sta, tid, WLAN_BACK_RECIPIENT,
1519 WLAN_REASON_QSTA_REQUIRE_SETUP,
1520 true);
1521 }
1522 mutex_unlock(&local->sta_mtx);
1523 } else switch (sdata->vif.type) {
1524 case NL80211_IFTYPE_STATION:
1525 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1526 break;
1527 case NL80211_IFTYPE_ADHOC:
1528 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1529 break;
1530 case NL80211_IFTYPE_MESH_POINT:
1531 if (!ieee80211_vif_is_mesh(&sdata->vif))
1532 break;
1533 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1534 break;
1535 default:
1536 WARN(1, "frame for unexpected interface type");
1537 break;
1538 }
1539 }
1540
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1541 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1542 struct sk_buff *skb)
1543 {
1544 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1545
1546 if (ieee80211_is_action(mgmt->frame_control) &&
1547 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1548 switch (mgmt->u.action.u.s1g.action_code) {
1549 case WLAN_S1G_TWT_TEARDOWN:
1550 case WLAN_S1G_TWT_SETUP:
1551 ieee80211_s1g_status_twt_action(sdata, skb);
1552 break;
1553 default:
1554 break;
1555 }
1556 }
1557 }
1558
ieee80211_iface_work(struct work_struct * work)1559 static void ieee80211_iface_work(struct work_struct *work)
1560 {
1561 struct ieee80211_sub_if_data *sdata =
1562 container_of(work, struct ieee80211_sub_if_data, work);
1563 struct ieee80211_local *local = sdata->local;
1564 struct sk_buff *skb;
1565
1566 if (!ieee80211_sdata_running(sdata))
1567 return;
1568
1569 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1570 return;
1571
1572 if (!ieee80211_can_run_worker(local))
1573 return;
1574
1575 /* first process frames */
1576 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1577 kcov_remote_start_common(skb_get_kcov_handle(skb));
1578
1579 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1580 ieee80211_process_tdls_channel_switch(sdata, skb);
1581 else
1582 ieee80211_iface_process_skb(local, sdata, skb);
1583
1584 kfree_skb(skb);
1585 kcov_remote_stop();
1586 }
1587
1588 /* process status queue */
1589 while ((skb = skb_dequeue(&sdata->status_queue))) {
1590 kcov_remote_start_common(skb_get_kcov_handle(skb));
1591
1592 ieee80211_iface_process_status(sdata, skb);
1593 kfree_skb(skb);
1594
1595 kcov_remote_stop();
1596 }
1597
1598 /* then other type-dependent work */
1599 switch (sdata->vif.type) {
1600 case NL80211_IFTYPE_STATION:
1601 ieee80211_sta_work(sdata);
1602 break;
1603 case NL80211_IFTYPE_ADHOC:
1604 ieee80211_ibss_work(sdata);
1605 break;
1606 case NL80211_IFTYPE_MESH_POINT:
1607 if (!ieee80211_vif_is_mesh(&sdata->vif))
1608 break;
1609 ieee80211_mesh_work(sdata);
1610 break;
1611 case NL80211_IFTYPE_OCB:
1612 ieee80211_ocb_work(sdata);
1613 break;
1614 default:
1615 break;
1616 }
1617 }
1618
ieee80211_recalc_smps_work(struct work_struct * work)1619 static void ieee80211_recalc_smps_work(struct work_struct *work)
1620 {
1621 struct ieee80211_sub_if_data *sdata =
1622 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1623
1624 ieee80211_recalc_smps(sdata);
1625 }
1626
1627 /*
1628 * Helper function to initialise an interface to a specific type.
1629 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1630 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1631 enum nl80211_iftype type)
1632 {
1633 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1634 0xff, 0xff, 0xff};
1635
1636 /* clear type-dependent union */
1637 memset(&sdata->u, 0, sizeof(sdata->u));
1638
1639 /* and set some type-dependent values */
1640 sdata->vif.type = type;
1641 sdata->vif.p2p = false;
1642 sdata->wdev.iftype = type;
1643
1644 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1645 sdata->control_port_no_encrypt = false;
1646 sdata->control_port_over_nl80211 = false;
1647 sdata->control_port_no_preauth = false;
1648 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1649 sdata->vif.bss_conf.idle = true;
1650 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1651
1652 sdata->noack_map = 0;
1653
1654 /* only monitor/p2p-device differ */
1655 if (sdata->dev) {
1656 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1657 sdata->dev->type = ARPHRD_ETHER;
1658 }
1659
1660 skb_queue_head_init(&sdata->skb_queue);
1661 skb_queue_head_init(&sdata->status_queue);
1662 INIT_WORK(&sdata->work, ieee80211_iface_work);
1663 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1664 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1665 INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work);
1666 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1667 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1668
1669 switch (type) {
1670 case NL80211_IFTYPE_P2P_GO:
1671 type = NL80211_IFTYPE_AP;
1672 sdata->vif.type = type;
1673 sdata->vif.p2p = true;
1674 fallthrough;
1675 case NL80211_IFTYPE_AP:
1676 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1677 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1678 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1679 break;
1680 case NL80211_IFTYPE_P2P_CLIENT:
1681 type = NL80211_IFTYPE_STATION;
1682 sdata->vif.type = type;
1683 sdata->vif.p2p = true;
1684 fallthrough;
1685 case NL80211_IFTYPE_STATION:
1686 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1687 ieee80211_sta_setup_sdata(sdata);
1688 break;
1689 case NL80211_IFTYPE_OCB:
1690 sdata->vif.bss_conf.bssid = bssid_wildcard;
1691 ieee80211_ocb_setup_sdata(sdata);
1692 break;
1693 case NL80211_IFTYPE_ADHOC:
1694 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1695 ieee80211_ibss_setup_sdata(sdata);
1696 break;
1697 case NL80211_IFTYPE_MESH_POINT:
1698 if (ieee80211_vif_is_mesh(&sdata->vif))
1699 ieee80211_mesh_init_sdata(sdata);
1700 break;
1701 case NL80211_IFTYPE_MONITOR:
1702 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1703 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1704 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1705 MONITOR_FLAG_OTHER_BSS;
1706 break;
1707 case NL80211_IFTYPE_NAN:
1708 idr_init(&sdata->u.nan.function_inst_ids);
1709 spin_lock_init(&sdata->u.nan.func_lock);
1710 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1711 break;
1712 case NL80211_IFTYPE_AP_VLAN:
1713 case NL80211_IFTYPE_P2P_DEVICE:
1714 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1715 break;
1716 case NL80211_IFTYPE_UNSPECIFIED:
1717 case NL80211_IFTYPE_WDS:
1718 case NUM_NL80211_IFTYPES:
1719 WARN_ON(1);
1720 break;
1721 }
1722
1723 ieee80211_debugfs_add_netdev(sdata);
1724 }
1725
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1726 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1727 enum nl80211_iftype type)
1728 {
1729 struct ieee80211_local *local = sdata->local;
1730 int ret, err;
1731 enum nl80211_iftype internal_type = type;
1732 bool p2p = false;
1733
1734 ASSERT_RTNL();
1735
1736 if (!local->ops->change_interface)
1737 return -EBUSY;
1738
1739 switch (sdata->vif.type) {
1740 case NL80211_IFTYPE_AP:
1741 if (!list_empty(&sdata->u.ap.vlans))
1742 return -EBUSY;
1743 break;
1744 case NL80211_IFTYPE_STATION:
1745 case NL80211_IFTYPE_ADHOC:
1746 case NL80211_IFTYPE_OCB:
1747 /*
1748 * Could maybe also all others here?
1749 * Just not sure how that interacts
1750 * with the RX/config path e.g. for
1751 * mesh.
1752 */
1753 break;
1754 default:
1755 return -EBUSY;
1756 }
1757
1758 switch (type) {
1759 case NL80211_IFTYPE_AP:
1760 case NL80211_IFTYPE_STATION:
1761 case NL80211_IFTYPE_ADHOC:
1762 case NL80211_IFTYPE_OCB:
1763 /*
1764 * Could probably support everything
1765 * but here.
1766 */
1767 break;
1768 case NL80211_IFTYPE_P2P_CLIENT:
1769 p2p = true;
1770 internal_type = NL80211_IFTYPE_STATION;
1771 break;
1772 case NL80211_IFTYPE_P2P_GO:
1773 p2p = true;
1774 internal_type = NL80211_IFTYPE_AP;
1775 break;
1776 default:
1777 return -EBUSY;
1778 }
1779
1780 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1781 if (ret)
1782 return ret;
1783
1784 ieee80211_stop_vif_queues(local, sdata,
1785 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1786 synchronize_net();
1787
1788 ieee80211_do_stop(sdata, false);
1789
1790 ieee80211_teardown_sdata(sdata);
1791
1792 ieee80211_set_sdata_offload_flags(sdata);
1793 ret = drv_change_interface(local, sdata, internal_type, p2p);
1794 if (ret)
1795 type = ieee80211_vif_type_p2p(&sdata->vif);
1796
1797 /*
1798 * Ignore return value here, there's not much we can do since
1799 * the driver changed the interface type internally already.
1800 * The warnings will hopefully make driver authors fix it :-)
1801 */
1802 ieee80211_check_queues(sdata, type);
1803
1804 ieee80211_setup_sdata(sdata, type);
1805 ieee80211_set_vif_encap_ops(sdata);
1806
1807 err = ieee80211_do_open(&sdata->wdev, false);
1808 WARN(err, "type change: do_open returned %d", err);
1809
1810 ieee80211_wake_vif_queues(local, sdata,
1811 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1812 return ret;
1813 }
1814
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1815 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1816 enum nl80211_iftype type)
1817 {
1818 int ret;
1819
1820 ASSERT_RTNL();
1821
1822 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1823 return 0;
1824
1825 if (ieee80211_sdata_running(sdata)) {
1826 ret = ieee80211_runtime_change_iftype(sdata, type);
1827 if (ret)
1828 return ret;
1829 } else {
1830 /* Purge and reset type-dependent state. */
1831 ieee80211_teardown_sdata(sdata);
1832 ieee80211_setup_sdata(sdata, type);
1833 }
1834
1835 /* reset some values that shouldn't be kept across type changes */
1836 if (type == NL80211_IFTYPE_STATION)
1837 sdata->u.mgd.use_4addr = false;
1838
1839 return 0;
1840 }
1841
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1842 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1843 u8 *perm_addr, enum nl80211_iftype type)
1844 {
1845 struct ieee80211_sub_if_data *sdata;
1846 u64 mask, start, addr, val, inc;
1847 u8 *m;
1848 u8 tmp_addr[ETH_ALEN];
1849 int i;
1850
1851 /* default ... something at least */
1852 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1853
1854 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1855 local->hw.wiphy->n_addresses <= 1)
1856 return;
1857
1858 mutex_lock(&local->iflist_mtx);
1859
1860 switch (type) {
1861 case NL80211_IFTYPE_MONITOR:
1862 /* doesn't matter */
1863 break;
1864 case NL80211_IFTYPE_AP_VLAN:
1865 /* match up with an AP interface */
1866 list_for_each_entry(sdata, &local->interfaces, list) {
1867 if (sdata->vif.type != NL80211_IFTYPE_AP)
1868 continue;
1869 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1870 break;
1871 }
1872 /* keep default if no AP interface present */
1873 break;
1874 case NL80211_IFTYPE_P2P_CLIENT:
1875 case NL80211_IFTYPE_P2P_GO:
1876 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1877 list_for_each_entry(sdata, &local->interfaces, list) {
1878 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1879 continue;
1880 if (!ieee80211_sdata_running(sdata))
1881 continue;
1882 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1883 goto out_unlock;
1884 }
1885 }
1886 fallthrough;
1887 default:
1888 /* assign a new address if possible -- try n_addresses first */
1889 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1890 bool used = false;
1891
1892 list_for_each_entry(sdata, &local->interfaces, list) {
1893 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1894 sdata->vif.addr)) {
1895 used = true;
1896 break;
1897 }
1898 }
1899
1900 if (!used) {
1901 memcpy(perm_addr,
1902 local->hw.wiphy->addresses[i].addr,
1903 ETH_ALEN);
1904 break;
1905 }
1906 }
1907
1908 /* try mask if available */
1909 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1910 break;
1911
1912 m = local->hw.wiphy->addr_mask;
1913 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1914 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1915 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1916
1917 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1918 /* not a contiguous mask ... not handled now! */
1919 pr_info("not contiguous\n");
1920 break;
1921 }
1922
1923 /*
1924 * Pick address of existing interface in case user changed
1925 * MAC address manually, default to perm_addr.
1926 */
1927 m = local->hw.wiphy->perm_addr;
1928 list_for_each_entry(sdata, &local->interfaces, list) {
1929 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1930 continue;
1931 m = sdata->vif.addr;
1932 break;
1933 }
1934 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1935 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1936 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1937
1938 inc = 1ULL<<__ffs64(mask);
1939 val = (start & mask);
1940 addr = (start & ~mask) | (val & mask);
1941 do {
1942 bool used = false;
1943
1944 tmp_addr[5] = addr >> 0*8;
1945 tmp_addr[4] = addr >> 1*8;
1946 tmp_addr[3] = addr >> 2*8;
1947 tmp_addr[2] = addr >> 3*8;
1948 tmp_addr[1] = addr >> 4*8;
1949 tmp_addr[0] = addr >> 5*8;
1950
1951 val += inc;
1952
1953 list_for_each_entry(sdata, &local->interfaces, list) {
1954 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1955 used = true;
1956 break;
1957 }
1958 }
1959
1960 if (!used) {
1961 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1962 break;
1963 }
1964 addr = (start & ~mask) | (val & mask);
1965 } while (addr != start);
1966
1967 break;
1968 }
1969
1970 out_unlock:
1971 mutex_unlock(&local->iflist_mtx);
1972 }
1973
ieee80211_if_add(struct ieee80211_local * local,const char * name,unsigned char name_assign_type,struct wireless_dev ** new_wdev,enum nl80211_iftype type,struct vif_params * params)1974 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1975 unsigned char name_assign_type,
1976 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1977 struct vif_params *params)
1978 {
1979 struct net_device *ndev = NULL;
1980 struct ieee80211_sub_if_data *sdata = NULL;
1981 struct txq_info *txqi;
1982 void (*if_setup)(struct net_device *dev);
1983 int ret, i;
1984 int txqs = 1;
1985
1986 ASSERT_RTNL();
1987
1988 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1989 struct wireless_dev *wdev;
1990
1991 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1992 GFP_KERNEL);
1993 if (!sdata)
1994 return -ENOMEM;
1995 wdev = &sdata->wdev;
1996
1997 sdata->dev = NULL;
1998 strlcpy(sdata->name, name, IFNAMSIZ);
1999 ieee80211_assign_perm_addr(local, wdev->address, type);
2000 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2001 } else {
2002 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2003 sizeof(void *));
2004 int txq_size = 0;
2005
2006 if (local->ops->wake_tx_queue &&
2007 type != NL80211_IFTYPE_AP_VLAN &&
2008 (type != NL80211_IFTYPE_MONITOR ||
2009 (params->flags & MONITOR_FLAG_ACTIVE)))
2010 txq_size += sizeof(struct txq_info) +
2011 local->hw.txq_data_size;
2012
2013 if (local->ops->wake_tx_queue) {
2014 if_setup = ieee80211_if_setup_no_queue;
2015 } else {
2016 if_setup = ieee80211_if_setup;
2017 if (local->hw.queues >= IEEE80211_NUM_ACS)
2018 txqs = IEEE80211_NUM_ACS;
2019 }
2020
2021 ndev = alloc_netdev_mqs(size + txq_size,
2022 name, name_assign_type,
2023 if_setup, txqs, 1);
2024 if (!ndev)
2025 return -ENOMEM;
2026
2027 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
2028 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
2029
2030 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2031
2032 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2033 if (!ndev->tstats) {
2034 free_netdev(ndev);
2035 return -ENOMEM;
2036 }
2037
2038 ndev->needed_headroom = local->tx_headroom +
2039 4*6 /* four MAC addresses */
2040 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2041 + 6 /* mesh */
2042 + 8 /* rfc1042/bridge tunnel */
2043 - ETH_HLEN /* ethernet hard_header_len */
2044 + IEEE80211_ENCRYPT_HEADROOM;
2045 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2046
2047 ret = dev_alloc_name(ndev, ndev->name);
2048 if (ret < 0) {
2049 ieee80211_if_free(ndev);
2050 free_netdev(ndev);
2051 return ret;
2052 }
2053
2054 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2055 if (is_valid_ether_addr(params->macaddr))
2056 eth_hw_addr_set(ndev, params->macaddr);
2057 else
2058 eth_hw_addr_set(ndev, ndev->perm_addr);
2059 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2060
2061 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2062 sdata = netdev_priv(ndev);
2063 ndev->ieee80211_ptr = &sdata->wdev;
2064 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2065 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2066
2067 if (txq_size) {
2068 txqi = netdev_priv(ndev) + size;
2069 ieee80211_txq_init(sdata, NULL, txqi, 0);
2070 }
2071
2072 sdata->dev = ndev;
2073 }
2074
2075 /* initialise type-independent data */
2076 sdata->wdev.wiphy = local->hw.wiphy;
2077 sdata->local = local;
2078
2079 ieee80211_init_frag_cache(&sdata->frags);
2080
2081 INIT_LIST_HEAD(&sdata->key_list);
2082
2083 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
2084 ieee80211_dfs_cac_timer_work);
2085 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2086 ieee80211_delayed_tailroom_dec);
2087
2088 for (i = 0; i < NUM_NL80211_BANDS; i++) {
2089 struct ieee80211_supported_band *sband;
2090 sband = local->hw.wiphy->bands[i];
2091 sdata->rc_rateidx_mask[i] =
2092 sband ? (1 << sband->n_bitrates) - 1 : 0;
2093 if (sband) {
2094 __le16 cap;
2095 u16 *vht_rate_mask;
2096
2097 memcpy(sdata->rc_rateidx_mcs_mask[i],
2098 sband->ht_cap.mcs.rx_mask,
2099 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2100
2101 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2102 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2103 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2104 } else {
2105 memset(sdata->rc_rateidx_mcs_mask[i], 0,
2106 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2107 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2108 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2109 }
2110 }
2111
2112 for (i = 0; i < IEEE80211_NUM_ACS; i++)
2113 init_airtime_info(&sdata->airtime[i], &local->airtime[i]);
2114
2115 ieee80211_set_default_queues(sdata);
2116
2117 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2118 sdata->user_power_level = local->user_power_level;
2119
2120 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2121
2122 /* setup type-dependent data */
2123 ieee80211_setup_sdata(sdata, type);
2124
2125 if (ndev) {
2126 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2127 if (type == NL80211_IFTYPE_STATION)
2128 sdata->u.mgd.use_4addr = params->use_4addr;
2129
2130 ndev->features |= local->hw.netdev_features;
2131 ndev->hw_features |= ndev->features &
2132 MAC80211_SUPPORTED_FEATURES_TX;
2133
2134 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2135
2136 /* MTU range is normally 256 - 2304, where the upper limit is
2137 * the maximum MSDU size. Monitor interfaces send and receive
2138 * MPDU and A-MSDU frames which may be much larger so we do
2139 * not impose an upper limit in that case.
2140 */
2141 ndev->min_mtu = 256;
2142 if (type == NL80211_IFTYPE_MONITOR)
2143 ndev->max_mtu = 0;
2144 else
2145 ndev->max_mtu = local->hw.max_mtu;
2146
2147 ret = cfg80211_register_netdevice(ndev);
2148 if (ret) {
2149 free_netdev(ndev);
2150 return ret;
2151 }
2152 }
2153
2154 mutex_lock(&local->iflist_mtx);
2155 list_add_tail_rcu(&sdata->list, &local->interfaces);
2156 mutex_unlock(&local->iflist_mtx);
2157
2158 if (new_wdev)
2159 *new_wdev = &sdata->wdev;
2160
2161 return 0;
2162 }
2163
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2164 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2165 {
2166 ASSERT_RTNL();
2167
2168 mutex_lock(&sdata->local->iflist_mtx);
2169 list_del_rcu(&sdata->list);
2170 mutex_unlock(&sdata->local->iflist_mtx);
2171
2172 if (sdata->vif.txq)
2173 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2174
2175 synchronize_rcu();
2176
2177 cfg80211_unregister_wdev(&sdata->wdev);
2178
2179 if (!sdata->dev) {
2180 ieee80211_teardown_sdata(sdata);
2181 kfree(sdata);
2182 }
2183 }
2184
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2185 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2186 {
2187 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2188 return;
2189 ieee80211_do_stop(sdata, true);
2190 }
2191
ieee80211_remove_interfaces(struct ieee80211_local * local)2192 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2193 {
2194 struct ieee80211_sub_if_data *sdata, *tmp;
2195 LIST_HEAD(unreg_list);
2196 LIST_HEAD(wdev_list);
2197
2198 ASSERT_RTNL();
2199
2200 /* Before destroying the interfaces, make sure they're all stopped so
2201 * that the hardware is stopped. Otherwise, the driver might still be
2202 * iterating the interfaces during the shutdown, e.g. from a worker
2203 * or from RX processing or similar, and if it does so (using atomic
2204 * iteration) while we're manipulating the list, the iteration will
2205 * crash.
2206 *
2207 * After this, the hardware should be stopped and the driver should
2208 * have stopped all of its activities, so that we can do RCU-unaware
2209 * manipulations of the interface list below.
2210 */
2211 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2212
2213 WARN(local->open_count, "%s: open count remains %d\n",
2214 wiphy_name(local->hw.wiphy), local->open_count);
2215
2216 ieee80211_txq_teardown_flows(local);
2217
2218 mutex_lock(&local->iflist_mtx);
2219 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2220 list_del(&sdata->list);
2221
2222 if (sdata->dev)
2223 unregister_netdevice_queue(sdata->dev, &unreg_list);
2224 else
2225 list_add(&sdata->list, &wdev_list);
2226 }
2227 mutex_unlock(&local->iflist_mtx);
2228
2229 unregister_netdevice_many(&unreg_list);
2230
2231 wiphy_lock(local->hw.wiphy);
2232 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2233 list_del(&sdata->list);
2234 cfg80211_unregister_wdev(&sdata->wdev);
2235 kfree(sdata);
2236 }
2237 wiphy_unlock(local->hw.wiphy);
2238 }
2239
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2240 static int netdev_notify(struct notifier_block *nb,
2241 unsigned long state, void *ptr)
2242 {
2243 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2244 struct ieee80211_sub_if_data *sdata;
2245
2246 if (state != NETDEV_CHANGENAME)
2247 return NOTIFY_DONE;
2248
2249 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2250 return NOTIFY_DONE;
2251
2252 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2253 return NOTIFY_DONE;
2254
2255 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2256 memcpy(sdata->name, dev->name, IFNAMSIZ);
2257 ieee80211_debugfs_rename_netdev(sdata);
2258
2259 return NOTIFY_OK;
2260 }
2261
2262 static struct notifier_block mac80211_netdev_notifier = {
2263 .notifier_call = netdev_notify,
2264 };
2265
ieee80211_iface_init(void)2266 int ieee80211_iface_init(void)
2267 {
2268 return register_netdevice_notifier(&mac80211_netdev_notifier);
2269 }
2270
ieee80211_iface_exit(void)2271 void ieee80211_iface_exit(void)
2272 {
2273 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2274 }
2275
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2276 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2277 {
2278 if (sdata->vif.type == NL80211_IFTYPE_AP)
2279 atomic_inc(&sdata->u.ap.num_mcast_sta);
2280 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2281 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2282 }
2283
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2284 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2285 {
2286 if (sdata->vif.type == NL80211_IFTYPE_AP)
2287 atomic_dec(&sdata->u.ap.num_mcast_sta);
2288 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2289 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2290 }
2291