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) 2018-2024 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 *and* wiphy mutex
37 * *and* iflist_mtx
38 * (2) 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 wiphy mutex, the iflist_mtx or RCU.
43 */
44
45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work);
46
__ieee80211_recalc_txpower(struct ieee80211_link_data * link)47 bool __ieee80211_recalc_txpower(struct ieee80211_link_data *link)
48 {
49 struct ieee80211_chanctx_conf *chanctx_conf;
50 int power;
51
52 rcu_read_lock();
53 chanctx_conf = rcu_dereference(link->conf->chanctx_conf);
54 if (!chanctx_conf) {
55 rcu_read_unlock();
56 return false;
57 }
58
59 power = ieee80211_chandef_max_power(&chanctx_conf->def);
60 rcu_read_unlock();
61
62 if (link->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
63 power = min(power, link->user_power_level);
64
65 if (link->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
66 power = min(power, link->ap_power_level);
67
68 if (power != link->conf->txpower) {
69 link->conf->txpower = power;
70 return true;
71 }
72
73 return false;
74 }
75
ieee80211_recalc_txpower(struct ieee80211_link_data * link,bool update_bss)76 void ieee80211_recalc_txpower(struct ieee80211_link_data *link,
77 bool update_bss)
78 {
79 if (__ieee80211_recalc_txpower(link) ||
80 (update_bss && ieee80211_sdata_running(link->sdata)))
81 ieee80211_link_info_change_notify(link->sdata, link,
82 BSS_CHANGED_TXPOWER);
83 }
84
__ieee80211_idle_off(struct ieee80211_local * local)85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
86 {
87 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
88 return 0;
89
90 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
91 return IEEE80211_CONF_CHANGE_IDLE;
92 }
93
__ieee80211_idle_on(struct ieee80211_local * local)94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
95 {
96 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
97 return 0;
98
99 ieee80211_flush_queues(local, NULL, false);
100
101 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
102 return IEEE80211_CONF_CHANGE_IDLE;
103 }
104
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
106 bool force_active)
107 {
108 bool working, scanning, active;
109 unsigned int led_trig_start = 0, led_trig_stop = 0;
110
111 lockdep_assert_wiphy(local->hw.wiphy);
112
113 active = force_active ||
114 !list_empty(&local->chanctx_list) ||
115 local->monitors;
116
117 working = !local->ops->remain_on_channel &&
118 !list_empty(&local->roc_list);
119
120 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
121 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
122
123 if (working || scanning)
124 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125 else
126 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127
128 if (active)
129 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130 else
131 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132
133 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
134
135 if (working || scanning || active)
136 return __ieee80211_idle_off(local);
137 return __ieee80211_idle_on(local);
138 }
139
ieee80211_idle_off(struct ieee80211_local * local)140 u32 ieee80211_idle_off(struct ieee80211_local *local)
141 {
142 return __ieee80211_recalc_idle(local, true);
143 }
144
ieee80211_recalc_idle(struct ieee80211_local * local)145 void ieee80211_recalc_idle(struct ieee80211_local *local)
146 {
147 u32 change = __ieee80211_recalc_idle(local, false);
148 if (change)
149 ieee80211_hw_config(local, change);
150 }
151
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
153 bool check_dup)
154 {
155 struct ieee80211_local *local = sdata->local;
156 struct ieee80211_sub_if_data *iter;
157 u64 new, mask, tmp;
158 u8 *m;
159 int ret = 0;
160
161 lockdep_assert_wiphy(local->hw.wiphy);
162
163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164 return 0;
165
166 m = addr;
167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171 m = local->hw.wiphy->addr_mask;
172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175
176 if (!check_dup)
177 return ret;
178
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
198 return ret;
199 }
200
ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)201 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
202 {
203 struct ieee80211_roc_work *roc;
204 struct ieee80211_local *local = sdata->local;
205 struct ieee80211_sub_if_data *scan_sdata;
206 int ret = 0;
207
208 lockdep_assert_wiphy(local->hw.wiphy);
209
210 /* To be the most flexible here we want to only limit changing the
211 * address if the specific interface is doing offchannel work or
212 * scanning.
213 */
214 if (netif_carrier_ok(sdata->dev))
215 return -EBUSY;
216
217 /* First check no ROC work is happening on this iface */
218 list_for_each_entry(roc, &local->roc_list, list) {
219 if (roc->sdata != sdata)
220 continue;
221
222 if (roc->started) {
223 ret = -EBUSY;
224 goto unlock;
225 }
226 }
227
228 /* And if this iface is scanning */
229 if (local->scanning) {
230 scan_sdata = rcu_dereference_protected(local->scan_sdata,
231 lockdep_is_held(&local->hw.wiphy->mtx));
232 if (sdata == scan_sdata)
233 ret = -EBUSY;
234 }
235
236 switch (sdata->vif.type) {
237 case NL80211_IFTYPE_STATION:
238 case NL80211_IFTYPE_P2P_CLIENT:
239 /* More interface types could be added here but changing the
240 * address while powered makes the most sense in client modes.
241 */
242 break;
243 default:
244 ret = -EOPNOTSUPP;
245 }
246
247 unlock:
248 return ret;
249 }
250
_ieee80211_change_mac(struct ieee80211_sub_if_data * sdata,void * addr)251 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
252 void *addr)
253 {
254 struct ieee80211_local *local = sdata->local;
255 struct sockaddr *sa = addr;
256 bool check_dup = true;
257 bool live = false;
258 int ret;
259
260 if (ieee80211_sdata_running(sdata)) {
261 ret = ieee80211_can_powered_addr_change(sdata);
262 if (ret)
263 return ret;
264
265 live = true;
266 }
267
268 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
269 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
270 check_dup = false;
271
272 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
273 if (ret)
274 return ret;
275
276 if (live)
277 drv_remove_interface(local, sdata);
278 ret = eth_mac_addr(sdata->dev, sa);
279
280 if (ret == 0) {
281 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
282 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
283 }
284
285 /* Regardless of eth_mac_addr() return we still want to add the
286 * interface back. This should not fail...
287 */
288 if (live)
289 WARN_ON(drv_add_interface(local, sdata));
290
291 return ret;
292 }
293
ieee80211_change_mac(struct net_device * dev,void * addr)294 static int ieee80211_change_mac(struct net_device *dev, void *addr)
295 {
296 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
297 struct ieee80211_local *local = sdata->local;
298
299 /*
300 * This happens during unregistration if there's a bond device
301 * active (maybe other cases?) and we must get removed from it.
302 * But we really don't care anymore if it's not registered now.
303 */
304 if (!dev->ieee80211_ptr->registered)
305 return 0;
306
307 guard(wiphy)(local->hw.wiphy);
308
309 return _ieee80211_change_mac(sdata, addr);
310 }
311
identical_mac_addr_allowed(int type1,int type2)312 static inline int identical_mac_addr_allowed(int type1, int type2)
313 {
314 return type1 == NL80211_IFTYPE_MONITOR ||
315 type2 == NL80211_IFTYPE_MONITOR ||
316 type1 == NL80211_IFTYPE_P2P_DEVICE ||
317 type2 == NL80211_IFTYPE_P2P_DEVICE ||
318 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
319 (type1 == NL80211_IFTYPE_AP_VLAN &&
320 (type2 == NL80211_IFTYPE_AP ||
321 type2 == NL80211_IFTYPE_AP_VLAN));
322 }
323
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)324 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
325 enum nl80211_iftype iftype)
326 {
327 struct ieee80211_local *local = sdata->local;
328 struct ieee80211_sub_if_data *nsdata;
329
330 ASSERT_RTNL();
331 lockdep_assert_wiphy(local->hw.wiphy);
332
333 /* we hold the RTNL here so can safely walk the list */
334 list_for_each_entry(nsdata, &local->interfaces, list) {
335 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
336 /*
337 * Only OCB and monitor mode may coexist
338 */
339 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
340 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
341 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
342 nsdata->vif.type == NL80211_IFTYPE_OCB))
343 return -EBUSY;
344
345 /*
346 * Allow only a single IBSS interface to be up at any
347 * time. This is restricted because beacon distribution
348 * cannot work properly if both are in the same IBSS.
349 *
350 * To remove this restriction we'd have to disallow them
351 * from setting the same SSID on different IBSS interfaces
352 * belonging to the same hardware. Then, however, we're
353 * faced with having to adopt two different TSF timers...
354 */
355 if (iftype == NL80211_IFTYPE_ADHOC &&
356 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
357 return -EBUSY;
358 /*
359 * will not add another interface while any channel
360 * switch is active.
361 */
362 if (nsdata->vif.bss_conf.csa_active)
363 return -EBUSY;
364
365 /*
366 * The remaining checks are only performed for interfaces
367 * with the same MAC address.
368 */
369 if (!ether_addr_equal(sdata->vif.addr,
370 nsdata->vif.addr))
371 continue;
372
373 /*
374 * check whether it may have the same address
375 */
376 if (!identical_mac_addr_allowed(iftype,
377 nsdata->vif.type))
378 return -ENOTUNIQ;
379
380 /* No support for VLAN with MLO yet */
381 if (iftype == NL80211_IFTYPE_AP_VLAN &&
382 sdata->wdev.use_4addr &&
383 nsdata->vif.type == NL80211_IFTYPE_AP &&
384 nsdata->vif.valid_links)
385 return -EOPNOTSUPP;
386
387 /*
388 * can only add VLANs to enabled APs
389 */
390 if (iftype == NL80211_IFTYPE_AP_VLAN &&
391 nsdata->vif.type == NL80211_IFTYPE_AP)
392 sdata->bss = &nsdata->u.ap;
393 }
394 }
395
396 return ieee80211_check_combinations(sdata, NULL, 0, 0, -1);
397 }
398
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)399 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
400 enum nl80211_iftype iftype)
401 {
402 int n_queues = sdata->local->hw.queues;
403 int i;
404
405 if (iftype == NL80211_IFTYPE_NAN)
406 return 0;
407
408 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
409 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
410 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
411 IEEE80211_INVAL_HW_QUEUE))
412 return -EINVAL;
413 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
414 n_queues))
415 return -EINVAL;
416 }
417 }
418
419 if ((iftype != NL80211_IFTYPE_AP &&
420 iftype != NL80211_IFTYPE_P2P_GO &&
421 iftype != NL80211_IFTYPE_MESH_POINT) ||
422 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
423 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
424 return 0;
425 }
426
427 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
428 return -EINVAL;
429
430 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
431 return -EINVAL;
432
433 return 0;
434 }
435
ieee80211_open(struct net_device * dev)436 static int ieee80211_open(struct net_device *dev)
437 {
438 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
439 int err;
440
441 /* fail early if user set an invalid address */
442 if (!is_valid_ether_addr(dev->dev_addr))
443 return -EADDRNOTAVAIL;
444
445 guard(wiphy)(sdata->local->hw.wiphy);
446
447 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
448 if (err)
449 return err;
450
451 return ieee80211_do_open(&sdata->wdev, true);
452 }
453
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)454 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
455 {
456 struct ieee80211_local *local = sdata->local;
457 unsigned long flags;
458 struct sk_buff_head freeq;
459 struct sk_buff *skb, *tmp;
460 u32 hw_reconf_flags = 0;
461 int i, flushed;
462 struct ps_data *ps;
463 struct cfg80211_chan_def chandef;
464 bool cancel_scan;
465 struct cfg80211_nan_func *func;
466
467 lockdep_assert_wiphy(local->hw.wiphy);
468
469 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
470 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
471
472 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
473 if (cancel_scan)
474 ieee80211_scan_cancel(local);
475
476 ieee80211_roc_purge(local, sdata);
477
478 switch (sdata->vif.type) {
479 case NL80211_IFTYPE_STATION:
480 ieee80211_mgd_stop(sdata);
481 break;
482 case NL80211_IFTYPE_ADHOC:
483 ieee80211_ibss_stop(sdata);
484 break;
485 case NL80211_IFTYPE_MONITOR:
486 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
487 break;
488 list_del_rcu(&sdata->u.mntr.list);
489 break;
490 default:
491 break;
492 }
493
494 /*
495 * Remove all stations associated with this interface.
496 *
497 * This must be done before calling ops->remove_interface()
498 * because otherwise we can later invoke ops->sta_notify()
499 * whenever the STAs are removed, and that invalidates driver
500 * assumptions about always getting a vif pointer that is valid
501 * (because if we remove a STA after ops->remove_interface()
502 * the driver will have removed the vif info already!)
503 *
504 * For AP_VLANs stations may exist since there's nothing else that
505 * would have removed them, but in other modes there shouldn't
506 * be any stations.
507 */
508 flushed = sta_info_flush(sdata, -1);
509 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
510
511 /* don't count this interface for allmulti while it is down */
512 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
513 atomic_dec(&local->iff_allmultis);
514
515 if (sdata->vif.type == NL80211_IFTYPE_AP) {
516 local->fif_pspoll--;
517 local->fif_probe_req--;
518 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
519 local->fif_probe_req--;
520 }
521
522 if (sdata->dev) {
523 netif_addr_lock_bh(sdata->dev);
524 spin_lock_bh(&local->filter_lock);
525 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
526 sdata->dev->addr_len);
527 spin_unlock_bh(&local->filter_lock);
528 netif_addr_unlock_bh(sdata->dev);
529 }
530
531 del_timer_sync(&local->dynamic_ps_timer);
532 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work);
533
534 WARN(ieee80211_vif_is_mld(&sdata->vif),
535 "destroying interface with valid links 0x%04x\n",
536 sdata->vif.valid_links);
537
538 sdata->vif.bss_conf.csa_active = false;
539 if (sdata->vif.type == NL80211_IFTYPE_STATION)
540 sdata->deflink.u.mgd.csa.waiting_bcn = false;
541 ieee80211_vif_unblock_queues_csa(sdata);
542
543 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work);
544 wiphy_work_cancel(local->hw.wiphy,
545 &sdata->deflink.color_change_finalize_work);
546 wiphy_delayed_work_cancel(local->hw.wiphy,
547 &sdata->deflink.dfs_cac_timer_work);
548
549 if (sdata->wdev.links[0].cac_started) {
550 chandef = sdata->vif.bss_conf.chanreq.oper;
551 WARN_ON(local->suspended);
552 ieee80211_link_release_channel(&sdata->deflink);
553 cfg80211_cac_event(sdata->dev, &chandef,
554 NL80211_RADAR_CAC_ABORTED,
555 GFP_KERNEL, 0);
556 }
557
558 if (sdata->vif.type == NL80211_IFTYPE_AP) {
559 WARN_ON(!list_empty(&sdata->u.ap.vlans));
560 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
561 /* remove all packets in parent bc_buf pointing to this dev */
562 ps = &sdata->bss->ps;
563
564 spin_lock_irqsave(&ps->bc_buf.lock, flags);
565 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
566 if (skb->dev == sdata->dev) {
567 __skb_unlink(skb, &ps->bc_buf);
568 local->total_ps_buffered--;
569 ieee80211_free_txskb(&local->hw, skb);
570 }
571 }
572 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
573 }
574
575 if (going_down)
576 local->open_count--;
577
578 switch (sdata->vif.type) {
579 case NL80211_IFTYPE_AP_VLAN:
580 list_del(&sdata->u.vlan.list);
581 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
582 /* see comment in the default case below */
583 ieee80211_free_keys(sdata, true);
584 /* no need to tell driver */
585 break;
586 case NL80211_IFTYPE_MONITOR:
587 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
588 local->cooked_mntrs--;
589 break;
590 }
591
592 local->monitors--;
593 if (local->monitors == 0) {
594 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
595 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
596 }
597
598 ieee80211_adjust_monitor_flags(sdata, -1);
599 break;
600 case NL80211_IFTYPE_NAN:
601 /* clean all the functions */
602 spin_lock_bh(&sdata->u.nan.func_lock);
603
604 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
605 idr_remove(&sdata->u.nan.function_inst_ids, i);
606 cfg80211_free_nan_func(func);
607 }
608 idr_destroy(&sdata->u.nan.function_inst_ids);
609
610 spin_unlock_bh(&sdata->u.nan.func_lock);
611 break;
612 case NL80211_IFTYPE_P2P_DEVICE:
613 /* relies on synchronize_rcu() below */
614 RCU_INIT_POINTER(local->p2p_sdata, NULL);
615 fallthrough;
616 default:
617 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
618 /*
619 * When we get here, the interface is marked down.
620 * Free the remaining keys, if there are any
621 * (which can happen in AP mode if userspace sets
622 * keys before the interface is operating)
623 *
624 * Force the key freeing to always synchronize_net()
625 * to wait for the RX path in case it is using this
626 * interface enqueuing frames at this very time on
627 * another CPU.
628 */
629 ieee80211_free_keys(sdata, true);
630 skb_queue_purge(&sdata->skb_queue);
631 skb_queue_purge(&sdata->status_queue);
632 }
633
634 /*
635 * Since ieee80211_free_txskb() may issue __dev_queue_xmit()
636 * which should be called with interrupts enabled, reclamation
637 * is done in two phases:
638 */
639 __skb_queue_head_init(&freeq);
640
641 /* unlink from local queues... */
642 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
643 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
644 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
645 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
646 if (info->control.vif == &sdata->vif) {
647 __skb_unlink(skb, &local->pending[i]);
648 __skb_queue_tail(&freeq, skb);
649 }
650 }
651 }
652 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
653
654 /* ... and perform actual reclamation with interrupts enabled. */
655 skb_queue_walk_safe(&freeq, skb, tmp) {
656 __skb_unlink(skb, &freeq);
657 ieee80211_free_txskb(&local->hw, skb);
658 }
659
660 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
661 ieee80211_txq_remove_vlan(local, sdata);
662
663 sdata->bss = NULL;
664
665 if (local->open_count == 0)
666 ieee80211_clear_tx_pending(local);
667
668 sdata->vif.bss_conf.beacon_int = 0;
669
670 /*
671 * If the interface goes down while suspended, presumably because
672 * the device was unplugged and that happens before our resume,
673 * then the driver is already unconfigured and the remainder of
674 * this function isn't needed.
675 * XXX: what about WoWLAN? If the device has software state, e.g.
676 * memory allocated, it might expect teardown commands from
677 * mac80211 here?
678 */
679 if (local->suspended) {
680 WARN_ON(local->wowlan);
681 WARN_ON(rcu_access_pointer(local->monitor_sdata));
682 return;
683 }
684
685 switch (sdata->vif.type) {
686 case NL80211_IFTYPE_AP_VLAN:
687 break;
688 case NL80211_IFTYPE_MONITOR:
689 if (local->monitors == 0)
690 ieee80211_del_virtual_monitor(local);
691
692 ieee80211_recalc_idle(local);
693 ieee80211_recalc_offload(local);
694
695 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) &&
696 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
697 break;
698
699 ieee80211_link_release_channel(&sdata->deflink);
700 fallthrough;
701 default:
702 if (!going_down)
703 break;
704 drv_remove_interface(local, sdata);
705
706 /* Clear private driver data to prevent reuse */
707 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size);
708 }
709
710 ieee80211_recalc_ps(local);
711
712 if (cancel_scan)
713 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
714
715 if (local->open_count == 0) {
716 ieee80211_stop_device(local, false);
717
718 /* no reconfiguring after stop! */
719 return;
720 }
721
722 /* do after stop to avoid reconfiguring when we stop anyway */
723 ieee80211_configure_filter(local);
724 ieee80211_hw_config(local, hw_reconf_flags);
725
726 if (local->monitors == local->open_count)
727 ieee80211_add_virtual_monitor(local);
728 }
729
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)730 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
731 {
732 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
733 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
734
735 if (!tx_vif)
736 return;
737
738 tx_sdata = vif_to_sdata(tx_vif);
739 sdata->vif.mbssid_tx_vif = NULL;
740
741 list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
742 &tx_sdata->local->interfaces, list) {
743 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
744 non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
745 ieee80211_sdata_running(non_tx_sdata)) {
746 non_tx_sdata->vif.mbssid_tx_vif = NULL;
747 dev_close(non_tx_sdata->wdev.netdev);
748 }
749 }
750
751 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
752 tx_sdata->vif.mbssid_tx_vif = NULL;
753 dev_close(tx_sdata->wdev.netdev);
754 }
755 }
756
ieee80211_stop(struct net_device * dev)757 static int ieee80211_stop(struct net_device *dev)
758 {
759 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
760
761 /* close dependent VLAN and MBSSID interfaces before locking wiphy */
762 if (sdata->vif.type == NL80211_IFTYPE_AP) {
763 struct ieee80211_sub_if_data *vlan, *tmpsdata;
764
765 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
766 u.vlan.list)
767 dev_close(vlan->dev);
768
769 ieee80211_stop_mbssid(sdata);
770 }
771
772 guard(wiphy)(sdata->local->hw.wiphy);
773
774 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work);
775
776 ieee80211_do_stop(sdata, true);
777
778 return 0;
779 }
780
ieee80211_set_multicast_list(struct net_device * dev)781 static void ieee80211_set_multicast_list(struct net_device *dev)
782 {
783 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
784 struct ieee80211_local *local = sdata->local;
785 int allmulti, sdata_allmulti;
786
787 allmulti = !!(dev->flags & IFF_ALLMULTI);
788 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
789
790 if (allmulti != sdata_allmulti) {
791 if (dev->flags & IFF_ALLMULTI)
792 atomic_inc(&local->iff_allmultis);
793 else
794 atomic_dec(&local->iff_allmultis);
795 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
796 }
797
798 spin_lock_bh(&local->filter_lock);
799 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
800 spin_unlock_bh(&local->filter_lock);
801 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter);
802 }
803
804 /*
805 * Called when the netdev is removed or, by the code below, before
806 * the interface type changes.
807 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)808 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
809 {
810 /* free extra data */
811 ieee80211_free_keys(sdata, false);
812
813 ieee80211_debugfs_remove_netdev(sdata);
814
815 ieee80211_destroy_frag_cache(&sdata->frags);
816
817 if (ieee80211_vif_is_mesh(&sdata->vif))
818 ieee80211_mesh_teardown_sdata(sdata);
819
820 ieee80211_vif_clear_links(sdata);
821 ieee80211_link_stop(&sdata->deflink);
822 }
823
ieee80211_uninit(struct net_device * dev)824 static void ieee80211_uninit(struct net_device *dev)
825 {
826 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
827 }
828
ieee80211_netdev_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)829 static int ieee80211_netdev_setup_tc(struct net_device *dev,
830 enum tc_setup_type type, void *type_data)
831 {
832 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
833 struct ieee80211_local *local = sdata->local;
834
835 return drv_net_setup_tc(local, sdata, dev, type, type_data);
836 }
837
838 static const struct net_device_ops ieee80211_dataif_ops = {
839 .ndo_open = ieee80211_open,
840 .ndo_stop = ieee80211_stop,
841 .ndo_uninit = ieee80211_uninit,
842 .ndo_start_xmit = ieee80211_subif_start_xmit,
843 .ndo_set_rx_mode = ieee80211_set_multicast_list,
844 .ndo_set_mac_address = ieee80211_change_mac,
845 .ndo_setup_tc = ieee80211_netdev_setup_tc,
846 };
847
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)848 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
849 struct sk_buff *skb,
850 struct net_device *sb_dev)
851 {
852 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
853 struct ieee80211_local *local = sdata->local;
854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
855 struct ieee80211_hdr *hdr;
856 int len_rthdr;
857
858 if (local->hw.queues < IEEE80211_NUM_ACS)
859 return 0;
860
861 /* reset flags and info before parsing radiotap header */
862 memset(info, 0, sizeof(*info));
863
864 if (!ieee80211_parse_tx_radiotap(skb, dev))
865 return 0; /* doesn't matter, frame will be dropped */
866
867 len_rthdr = ieee80211_get_radiotap_len(skb->data);
868 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
869 if (skb->len < len_rthdr + 2 ||
870 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
871 return 0; /* doesn't matter, frame will be dropped */
872
873 return ieee80211_select_queue_80211(sdata, skb, hdr);
874 }
875
876 static const struct net_device_ops ieee80211_monitorif_ops = {
877 .ndo_open = ieee80211_open,
878 .ndo_stop = ieee80211_stop,
879 .ndo_uninit = ieee80211_uninit,
880 .ndo_start_xmit = ieee80211_monitor_start_xmit,
881 .ndo_set_rx_mode = ieee80211_set_multicast_list,
882 .ndo_set_mac_address = ieee80211_change_mac,
883 .ndo_select_queue = ieee80211_monitor_select_queue,
884 };
885
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)886 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
887 struct net_device_path *path)
888 {
889 struct ieee80211_sub_if_data *sdata;
890 struct ieee80211_local *local;
891 struct sta_info *sta;
892 int ret = -ENOENT;
893
894 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
895 local = sdata->local;
896
897 if (!local->ops->net_fill_forward_path)
898 return -EOPNOTSUPP;
899
900 rcu_read_lock();
901 switch (sdata->vif.type) {
902 case NL80211_IFTYPE_AP_VLAN:
903 sta = rcu_dereference(sdata->u.vlan.sta);
904 if (sta)
905 break;
906 if (sdata->wdev.use_4addr)
907 goto out;
908 if (is_multicast_ether_addr(ctx->daddr))
909 goto out;
910 sta = sta_info_get_bss(sdata, ctx->daddr);
911 break;
912 case NL80211_IFTYPE_AP:
913 if (is_multicast_ether_addr(ctx->daddr))
914 goto out;
915 sta = sta_info_get(sdata, ctx->daddr);
916 break;
917 case NL80211_IFTYPE_STATION:
918 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
919 sta = sta_info_get(sdata, ctx->daddr);
920 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
921 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
922 goto out;
923
924 break;
925 }
926 }
927
928 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
929 break;
930 default:
931 goto out;
932 }
933
934 if (!sta)
935 goto out;
936
937 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
938 out:
939 rcu_read_unlock();
940
941 return ret;
942 }
943
944 static const struct net_device_ops ieee80211_dataif_8023_ops = {
945 .ndo_open = ieee80211_open,
946 .ndo_stop = ieee80211_stop,
947 .ndo_uninit = ieee80211_uninit,
948 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
949 .ndo_set_rx_mode = ieee80211_set_multicast_list,
950 .ndo_set_mac_address = ieee80211_change_mac,
951 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
952 .ndo_setup_tc = ieee80211_netdev_setup_tc,
953 };
954
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)955 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
956 {
957 switch (iftype) {
958 /* P2P GO and client are mapped to AP/STATION types */
959 case NL80211_IFTYPE_AP:
960 case NL80211_IFTYPE_STATION:
961 return true;
962 default:
963 return false;
964 }
965 }
966
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)967 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
968 {
969 struct ieee80211_local *local = sdata->local;
970 u32 flags;
971
972 flags = sdata->vif.offload_flags;
973
974 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
975 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
976 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
977
978 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
979 local->hw.wiphy->frag_threshold != (u32)-1)
980 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
981
982 if (local->monitors)
983 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
984 } else {
985 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
986 }
987
988 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
989 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
990 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
991
992 if (local->monitors &&
993 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
994 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
995 } else {
996 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
997 }
998
999 if (sdata->vif.offload_flags == flags)
1000 return false;
1001
1002 sdata->vif.offload_flags = flags;
1003 ieee80211_check_fast_rx_iface(sdata);
1004 return true;
1005 }
1006
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)1007 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1008 {
1009 struct ieee80211_local *local = sdata->local;
1010 struct ieee80211_sub_if_data *bss = sdata;
1011 bool enabled;
1012
1013 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1014 if (!sdata->bss)
1015 return;
1016
1017 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1018 }
1019
1020 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1021 !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1022 return;
1023
1024 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1025 if (sdata->wdev.use_4addr &&
1026 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1027 enabled = false;
1028
1029 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1030 &ieee80211_dataif_ops;
1031 }
1032
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1033 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1034 {
1035 struct ieee80211_local *local = sdata->local;
1036 struct ieee80211_sub_if_data *vsdata;
1037
1038 if (ieee80211_set_sdata_offload_flags(sdata)) {
1039 drv_update_vif_offload(local, sdata);
1040 ieee80211_set_vif_encap_ops(sdata);
1041 }
1042
1043 list_for_each_entry(vsdata, &local->interfaces, list) {
1044 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1045 vsdata->bss != &sdata->u.ap)
1046 continue;
1047
1048 ieee80211_set_vif_encap_ops(vsdata);
1049 }
1050 }
1051
ieee80211_recalc_offload(struct ieee80211_local * local)1052 void ieee80211_recalc_offload(struct ieee80211_local *local)
1053 {
1054 struct ieee80211_sub_if_data *sdata;
1055
1056 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1057 return;
1058
1059 lockdep_assert_wiphy(local->hw.wiphy);
1060
1061 list_for_each_entry(sdata, &local->interfaces, list) {
1062 if (!ieee80211_sdata_running(sdata))
1063 continue;
1064
1065 ieee80211_recalc_sdata_offload(sdata);
1066 }
1067 }
1068
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1069 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1070 const int offset)
1071 {
1072 struct ieee80211_local *local = sdata->local;
1073 u32 flags = sdata->u.mntr.flags;
1074
1075 #define ADJUST(_f, _s) do { \
1076 if (flags & MONITOR_FLAG_##_f) \
1077 local->fif_##_s += offset; \
1078 } while (0)
1079
1080 ADJUST(FCSFAIL, fcsfail);
1081 ADJUST(PLCPFAIL, plcpfail);
1082 ADJUST(CONTROL, control);
1083 ADJUST(CONTROL, pspoll);
1084 ADJUST(OTHER_BSS, other_bss);
1085 if (!(flags & MONITOR_FLAG_SKIP_TX))
1086 local->tx_mntrs += offset;
1087
1088 #undef ADJUST
1089 }
1090
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1091 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1092 {
1093 struct ieee80211_local *local = sdata->local;
1094 int i;
1095
1096 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1097 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1098 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1099 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1100 sdata->vif.hw_queue[i] = i;
1101 else
1102 sdata->vif.hw_queue[i] = 0;
1103 }
1104 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1105 }
1106
ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1107 static void ieee80211_sdata_init(struct ieee80211_local *local,
1108 struct ieee80211_sub_if_data *sdata)
1109 {
1110 sdata->local = local;
1111
1112 /*
1113 * Initialize the default link, so we can use link_id 0 for non-MLD,
1114 * and that continues to work for non-MLD-aware drivers that use just
1115 * vif.bss_conf instead of vif.link_conf.
1116 *
1117 * Note that we never change this, so if link ID 0 isn't used in an
1118 * MLD connection, we get a separate allocation for it.
1119 */
1120 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1121 }
1122
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1123 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1124 {
1125 struct ieee80211_sub_if_data *sdata;
1126 int ret;
1127
1128 ASSERT_RTNL();
1129 lockdep_assert_wiphy(local->hw.wiphy);
1130
1131 if (local->monitor_sdata ||
1132 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
1133 return 0;
1134
1135 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1136 if (!sdata)
1137 return -ENOMEM;
1138
1139 /* set up data */
1140 sdata->vif.type = NL80211_IFTYPE_MONITOR;
1141 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1142 wiphy_name(local->hw.wiphy));
1143 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1144 sdata->wdev.wiphy = local->hw.wiphy;
1145
1146 ieee80211_sdata_init(local, sdata);
1147
1148 ieee80211_set_default_queues(sdata);
1149
1150 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1151 ret = drv_add_interface(local, sdata);
1152 if (WARN_ON(ret)) {
1153 /* ok .. stupid driver, it asked for this! */
1154 kfree(sdata);
1155 return ret;
1156 }
1157 }
1158
1159 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1160
1161 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1162 if (ret) {
1163 kfree(sdata);
1164 return ret;
1165 }
1166
1167 mutex_lock(&local->iflist_mtx);
1168 rcu_assign_pointer(local->monitor_sdata, sdata);
1169 mutex_unlock(&local->iflist_mtx);
1170
1171 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq,
1172 IEEE80211_CHANCTX_EXCLUSIVE);
1173 if (ret) {
1174 mutex_lock(&local->iflist_mtx);
1175 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1176 mutex_unlock(&local->iflist_mtx);
1177 synchronize_net();
1178 drv_remove_interface(local, sdata);
1179 kfree(sdata);
1180 return ret;
1181 }
1182
1183 skb_queue_head_init(&sdata->skb_queue);
1184 skb_queue_head_init(&sdata->status_queue);
1185 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1186
1187 return 0;
1188 }
1189
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1190 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1191 {
1192 struct ieee80211_sub_if_data *sdata;
1193
1194 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
1195 return;
1196
1197 ASSERT_RTNL();
1198 lockdep_assert_wiphy(local->hw.wiphy);
1199
1200 mutex_lock(&local->iflist_mtx);
1201
1202 sdata = rcu_dereference_protected(local->monitor_sdata,
1203 lockdep_is_held(&local->iflist_mtx));
1204 if (!sdata) {
1205 mutex_unlock(&local->iflist_mtx);
1206 return;
1207 }
1208
1209 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1210 ieee80211_link_release_channel(&sdata->deflink);
1211
1212 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1213 drv_remove_interface(local, sdata);
1214
1215 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1216 mutex_unlock(&local->iflist_mtx);
1217
1218 synchronize_net();
1219
1220 kfree(sdata);
1221 }
1222
1223 /*
1224 * NOTE: Be very careful when changing this function, it must NOT return
1225 * an error on interface type changes that have been pre-checked, so most
1226 * checks should be in ieee80211_check_concurrent_iface.
1227 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1228 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1229 {
1230 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1231 struct net_device *dev = wdev->netdev;
1232 struct ieee80211_local *local = sdata->local;
1233 u64 changed = 0;
1234 int res;
1235 u32 hw_reconf_flags = 0;
1236
1237 lockdep_assert_wiphy(local->hw.wiphy);
1238
1239 switch (sdata->vif.type) {
1240 case NL80211_IFTYPE_AP_VLAN: {
1241 struct ieee80211_sub_if_data *master;
1242
1243 if (!sdata->bss)
1244 return -ENOLINK;
1245
1246 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1247
1248 master = container_of(sdata->bss,
1249 struct ieee80211_sub_if_data, u.ap);
1250 sdata->control_port_protocol =
1251 master->control_port_protocol;
1252 sdata->control_port_no_encrypt =
1253 master->control_port_no_encrypt;
1254 sdata->control_port_over_nl80211 =
1255 master->control_port_over_nl80211;
1256 sdata->control_port_no_preauth =
1257 master->control_port_no_preauth;
1258 sdata->vif.cab_queue = master->vif.cab_queue;
1259 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1260 sizeof(sdata->vif.hw_queue));
1261 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq;
1262
1263 sdata->crypto_tx_tailroom_needed_cnt +=
1264 master->crypto_tx_tailroom_needed_cnt;
1265
1266 break;
1267 }
1268 case NL80211_IFTYPE_AP:
1269 sdata->bss = &sdata->u.ap;
1270 break;
1271 case NL80211_IFTYPE_MESH_POINT:
1272 case NL80211_IFTYPE_STATION:
1273 case NL80211_IFTYPE_MONITOR:
1274 case NL80211_IFTYPE_ADHOC:
1275 case NL80211_IFTYPE_P2P_DEVICE:
1276 case NL80211_IFTYPE_OCB:
1277 case NL80211_IFTYPE_NAN:
1278 /* no special treatment */
1279 break;
1280 case NL80211_IFTYPE_UNSPECIFIED:
1281 case NUM_NL80211_IFTYPES:
1282 case NL80211_IFTYPE_P2P_CLIENT:
1283 case NL80211_IFTYPE_P2P_GO:
1284 case NL80211_IFTYPE_WDS:
1285 /* cannot happen */
1286 WARN_ON(1);
1287 break;
1288 }
1289
1290 if (local->open_count == 0) {
1291 /* here we can consider everything in good order (again) */
1292 local->reconfig_failure = false;
1293
1294 res = drv_start(local);
1295 if (res)
1296 goto err_del_bss;
1297 ieee80211_led_radio(local, true);
1298 ieee80211_mod_tpt_led_trig(local,
1299 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1300 }
1301
1302 /*
1303 * Copy the hopefully now-present MAC address to
1304 * this interface, if it has the special null one.
1305 */
1306 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1307 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1308 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1309
1310 if (!is_valid_ether_addr(dev->dev_addr)) {
1311 res = -EADDRNOTAVAIL;
1312 goto err_stop;
1313 }
1314 }
1315
1316 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1317 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE);
1318 switch (sdata->vif.type) {
1319 case NL80211_IFTYPE_AP_VLAN:
1320 /* no need to tell driver, but set carrier and chanctx */
1321 if (sdata->bss->active) {
1322 ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1323 netif_carrier_on(dev);
1324 ieee80211_set_vif_encap_ops(sdata);
1325 } else {
1326 netif_carrier_off(dev);
1327 }
1328 break;
1329 case NL80211_IFTYPE_MONITOR:
1330 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1331 local->cooked_mntrs++;
1332 break;
1333 }
1334
1335 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
1336 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
1337 res = drv_add_interface(local, sdata);
1338 if (res)
1339 goto err_stop;
1340 } else if (local->monitors == 0 && local->open_count == 0) {
1341 res = ieee80211_add_virtual_monitor(local);
1342 if (res)
1343 goto err_stop;
1344 }
1345
1346 /* must be before the call to ieee80211_configure_filter */
1347 local->monitors++;
1348 if (local->monitors == 1) {
1349 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1350 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1351 }
1352
1353 ieee80211_adjust_monitor_flags(sdata, 1);
1354 ieee80211_configure_filter(local);
1355 ieee80211_recalc_offload(local);
1356 ieee80211_recalc_idle(local);
1357
1358 netif_carrier_on(dev);
1359 break;
1360 default:
1361 if (coming_up) {
1362 ieee80211_del_virtual_monitor(local);
1363 ieee80211_set_sdata_offload_flags(sdata);
1364
1365 res = drv_add_interface(local, sdata);
1366 if (res)
1367 goto err_stop;
1368
1369 ieee80211_set_vif_encap_ops(sdata);
1370 res = ieee80211_check_queues(sdata,
1371 ieee80211_vif_type_p2p(&sdata->vif));
1372 if (res)
1373 goto err_del_interface;
1374 }
1375
1376 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1377 local->fif_pspoll++;
1378 local->fif_probe_req++;
1379
1380 ieee80211_configure_filter(local);
1381 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1382 local->fif_probe_req++;
1383 }
1384
1385 if (sdata->vif.probe_req_reg)
1386 drv_config_iface_filter(local, sdata,
1387 FIF_PROBE_REQ,
1388 FIF_PROBE_REQ);
1389
1390 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1391 sdata->vif.type != NL80211_IFTYPE_NAN)
1392 changed |= ieee80211_reset_erp_info(sdata);
1393 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1394 changed);
1395
1396 switch (sdata->vif.type) {
1397 case NL80211_IFTYPE_STATION:
1398 case NL80211_IFTYPE_ADHOC:
1399 case NL80211_IFTYPE_AP:
1400 case NL80211_IFTYPE_MESH_POINT:
1401 case NL80211_IFTYPE_OCB:
1402 netif_carrier_off(dev);
1403 break;
1404 case NL80211_IFTYPE_P2P_DEVICE:
1405 case NL80211_IFTYPE_NAN:
1406 break;
1407 default:
1408 /* not reached */
1409 WARN_ON(1);
1410 }
1411
1412 /*
1413 * Set default queue parameters so drivers don't
1414 * need to initialise the hardware if the hardware
1415 * doesn't start up with sane defaults.
1416 * Enable QoS for anything but station interfaces.
1417 */
1418 ieee80211_set_wmm_default(&sdata->deflink, true,
1419 sdata->vif.type != NL80211_IFTYPE_STATION);
1420 }
1421
1422 switch (sdata->vif.type) {
1423 case NL80211_IFTYPE_P2P_DEVICE:
1424 rcu_assign_pointer(local->p2p_sdata, sdata);
1425 break;
1426 case NL80211_IFTYPE_MONITOR:
1427 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1428 break;
1429 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1430 break;
1431 default:
1432 break;
1433 }
1434
1435 /*
1436 * set_multicast_list will be invoked by the networking core
1437 * which will check whether any increments here were done in
1438 * error and sync them down to the hardware as filter flags.
1439 */
1440 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1441 atomic_inc(&local->iff_allmultis);
1442
1443 if (coming_up)
1444 local->open_count++;
1445
1446 if (local->open_count == 1)
1447 ieee80211_hw_conf_init(local);
1448 else if (hw_reconf_flags)
1449 ieee80211_hw_config(local, hw_reconf_flags);
1450
1451 ieee80211_recalc_ps(local);
1452
1453 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1454
1455 return 0;
1456 err_del_interface:
1457 drv_remove_interface(local, sdata);
1458 err_stop:
1459 if (!local->open_count)
1460 drv_stop(local, false);
1461 err_del_bss:
1462 sdata->bss = NULL;
1463 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1464 list_del(&sdata->u.vlan.list);
1465 /* might already be clear but that doesn't matter */
1466 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1467 return res;
1468 }
1469
ieee80211_if_setup(struct net_device * dev)1470 static void ieee80211_if_setup(struct net_device *dev)
1471 {
1472 ether_setup(dev);
1473 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1474 dev->priv_flags |= IFF_NO_QUEUE;
1475 dev->netdev_ops = &ieee80211_dataif_ops;
1476 dev->needs_free_netdev = true;
1477 }
1478
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1479 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1480 struct ieee80211_sub_if_data *sdata,
1481 struct sk_buff *skb)
1482 {
1483 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1484
1485 lockdep_assert_wiphy(local->hw.wiphy);
1486
1487 if (ieee80211_is_action(mgmt->frame_control) &&
1488 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1489 struct sta_info *sta;
1490 int len = skb->len;
1491
1492 sta = sta_info_get_bss(sdata, mgmt->sa);
1493 if (sta) {
1494 switch (mgmt->u.action.u.addba_req.action_code) {
1495 case WLAN_ACTION_ADDBA_REQ:
1496 ieee80211_process_addba_request(local, sta,
1497 mgmt, len);
1498 break;
1499 case WLAN_ACTION_ADDBA_RESP:
1500 ieee80211_process_addba_resp(local, sta,
1501 mgmt, len);
1502 break;
1503 case WLAN_ACTION_DELBA:
1504 ieee80211_process_delba(sdata, sta,
1505 mgmt, len);
1506 break;
1507 default:
1508 WARN_ON(1);
1509 break;
1510 }
1511 }
1512 } else if (ieee80211_is_action(mgmt->frame_control) &&
1513 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1514 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1515 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1516 struct ieee80211_rx_status *status;
1517 enum nl80211_band band;
1518 struct sta_info *sta;
1519 u8 opmode;
1520
1521 status = IEEE80211_SKB_RXCB(skb);
1522 band = status->band;
1523 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1524
1525 sta = sta_info_get_bss(sdata, mgmt->sa);
1526
1527 if (sta)
1528 ieee80211_vht_handle_opmode(sdata,
1529 &sta->deflink,
1530 opmode, band);
1531
1532 break;
1533 }
1534 case WLAN_VHT_ACTION_GROUPID_MGMT:
1535 ieee80211_process_mu_groups(sdata, &sdata->deflink,
1536 mgmt);
1537 break;
1538 default:
1539 WARN_ON(1);
1540 break;
1541 }
1542 } else if (ieee80211_is_action(mgmt->frame_control) &&
1543 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1544 switch (mgmt->u.action.u.s1g.action_code) {
1545 case WLAN_S1G_TWT_TEARDOWN:
1546 case WLAN_S1G_TWT_SETUP:
1547 ieee80211_s1g_rx_twt_action(sdata, skb);
1548 break;
1549 default:
1550 break;
1551 }
1552 } else if (ieee80211_is_action(mgmt->frame_control) &&
1553 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) {
1554 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1555 switch (mgmt->u.action.u.ttlm_req.action_code) {
1556 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
1557 ieee80211_process_neg_ttlm_req(sdata, mgmt,
1558 skb->len);
1559 break;
1560 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
1561 ieee80211_process_neg_ttlm_res(sdata, mgmt,
1562 skb->len);
1563 break;
1564 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP:
1565 ieee80211_process_ml_reconf_resp(sdata, mgmt,
1566 skb->len);
1567 break;
1568 default:
1569 break;
1570 }
1571 }
1572 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1573 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1574 ieee80211_sta_rx_queued_ext(sdata, skb);
1575 else
1576 WARN_ON(1);
1577 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1578 struct ieee80211_hdr *hdr = (void *)mgmt;
1579 struct sta_info *sta;
1580
1581 /*
1582 * So the frame isn't mgmt, but frame_control
1583 * is at the right place anyway, of course, so
1584 * the if statement is correct.
1585 *
1586 * Warn if we have other data frame types here,
1587 * they must not get here.
1588 */
1589 WARN_ON(hdr->frame_control &
1590 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1591 WARN_ON(!(hdr->seq_ctrl &
1592 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1593 /*
1594 * This was a fragment of a frame, received while
1595 * a block-ack session was active. That cannot be
1596 * right, so terminate the session.
1597 */
1598 sta = sta_info_get_bss(sdata, mgmt->sa);
1599 if (sta) {
1600 u16 tid = ieee80211_get_tid(hdr);
1601
1602 __ieee80211_stop_rx_ba_session(
1603 sta, tid, WLAN_BACK_RECIPIENT,
1604 WLAN_REASON_QSTA_REQUIRE_SETUP,
1605 true);
1606 }
1607 } else switch (sdata->vif.type) {
1608 case NL80211_IFTYPE_STATION:
1609 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1610 break;
1611 case NL80211_IFTYPE_ADHOC:
1612 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1613 break;
1614 case NL80211_IFTYPE_MESH_POINT:
1615 if (!ieee80211_vif_is_mesh(&sdata->vif))
1616 break;
1617 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1618 break;
1619 default:
1620 WARN(1, "frame for unexpected interface type");
1621 break;
1622 }
1623 }
1624
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1625 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1626 struct sk_buff *skb)
1627 {
1628 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1629
1630 if (ieee80211_is_action(mgmt->frame_control) &&
1631 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1632 switch (mgmt->u.action.u.s1g.action_code) {
1633 case WLAN_S1G_TWT_TEARDOWN:
1634 case WLAN_S1G_TWT_SETUP:
1635 ieee80211_s1g_status_twt_action(sdata, skb);
1636 break;
1637 default:
1638 break;
1639 }
1640 }
1641 }
1642
ieee80211_iface_work(struct wiphy * wiphy,struct wiphy_work * work)1643 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1644 {
1645 struct ieee80211_sub_if_data *sdata =
1646 container_of(work, struct ieee80211_sub_if_data, work);
1647 struct ieee80211_local *local = sdata->local;
1648 struct sk_buff *skb;
1649
1650 if (!ieee80211_sdata_running(sdata))
1651 return;
1652
1653 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1654 return;
1655
1656 if (!ieee80211_can_run_worker(local))
1657 return;
1658
1659 /* first process frames */
1660 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1661 kcov_remote_start_common(skb_get_kcov_handle(skb));
1662
1663 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1664 ieee80211_process_tdls_channel_switch(sdata, skb);
1665 else
1666 ieee80211_iface_process_skb(local, sdata, skb);
1667
1668 kfree_skb(skb);
1669 kcov_remote_stop();
1670 }
1671
1672 /* process status queue */
1673 while ((skb = skb_dequeue(&sdata->status_queue))) {
1674 kcov_remote_start_common(skb_get_kcov_handle(skb));
1675
1676 ieee80211_iface_process_status(sdata, skb);
1677 kfree_skb(skb);
1678
1679 kcov_remote_stop();
1680 }
1681
1682 /* then other type-dependent work */
1683 switch (sdata->vif.type) {
1684 case NL80211_IFTYPE_STATION:
1685 ieee80211_sta_work(sdata);
1686 break;
1687 case NL80211_IFTYPE_ADHOC:
1688 ieee80211_ibss_work(sdata);
1689 break;
1690 case NL80211_IFTYPE_MESH_POINT:
1691 if (!ieee80211_vif_is_mesh(&sdata->vif))
1692 break;
1693 ieee80211_mesh_work(sdata);
1694 break;
1695 case NL80211_IFTYPE_OCB:
1696 ieee80211_ocb_work(sdata);
1697 break;
1698 default:
1699 break;
1700 }
1701 }
1702
ieee80211_activate_links_work(struct wiphy * wiphy,struct wiphy_work * work)1703 static void ieee80211_activate_links_work(struct wiphy *wiphy,
1704 struct wiphy_work *work)
1705 {
1706 struct ieee80211_sub_if_data *sdata =
1707 container_of(work, struct ieee80211_sub_if_data,
1708 activate_links_work);
1709 struct ieee80211_local *local = wiphy_priv(wiphy);
1710
1711 if (local->in_reconfig)
1712 return;
1713
1714 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1715 sdata->desired_active_links = 0;
1716 }
1717
1718 /*
1719 * Helper function to initialise an interface to a specific type.
1720 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1721 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1722 enum nl80211_iftype type)
1723 {
1724 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1725 0xff, 0xff, 0xff};
1726
1727 /* clear type-dependent unions */
1728 memset(&sdata->u, 0, sizeof(sdata->u));
1729 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1730
1731 /* and set some type-dependent values */
1732 sdata->vif.type = type;
1733 sdata->vif.p2p = false;
1734 sdata->wdev.iftype = type;
1735
1736 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1737 sdata->control_port_no_encrypt = false;
1738 sdata->control_port_over_nl80211 = false;
1739 sdata->control_port_no_preauth = false;
1740 sdata->vif.cfg.idle = true;
1741 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1742
1743 sdata->noack_map = 0;
1744
1745 /* only monitor/p2p-device differ */
1746 if (sdata->dev) {
1747 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1748 sdata->dev->type = ARPHRD_ETHER;
1749 }
1750
1751 skb_queue_head_init(&sdata->skb_queue);
1752 skb_queue_head_init(&sdata->status_queue);
1753 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1754 wiphy_work_init(&sdata->activate_links_work,
1755 ieee80211_activate_links_work);
1756
1757 switch (type) {
1758 case NL80211_IFTYPE_P2P_GO:
1759 type = NL80211_IFTYPE_AP;
1760 sdata->vif.type = type;
1761 sdata->vif.p2p = true;
1762 fallthrough;
1763 case NL80211_IFTYPE_AP:
1764 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1765 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1766 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1767 break;
1768 case NL80211_IFTYPE_P2P_CLIENT:
1769 type = NL80211_IFTYPE_STATION;
1770 sdata->vif.type = type;
1771 sdata->vif.p2p = true;
1772 fallthrough;
1773 case NL80211_IFTYPE_STATION:
1774 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1775 ieee80211_sta_setup_sdata(sdata);
1776 break;
1777 case NL80211_IFTYPE_OCB:
1778 sdata->vif.bss_conf.bssid = bssid_wildcard;
1779 ieee80211_ocb_setup_sdata(sdata);
1780 break;
1781 case NL80211_IFTYPE_ADHOC:
1782 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1783 ieee80211_ibss_setup_sdata(sdata);
1784 break;
1785 case NL80211_IFTYPE_MESH_POINT:
1786 if (ieee80211_vif_is_mesh(&sdata->vif))
1787 ieee80211_mesh_init_sdata(sdata);
1788 break;
1789 case NL80211_IFTYPE_MONITOR:
1790 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1791 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1792 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1793 MONITOR_FLAG_OTHER_BSS;
1794 break;
1795 case NL80211_IFTYPE_NAN:
1796 idr_init(&sdata->u.nan.function_inst_ids);
1797 spin_lock_init(&sdata->u.nan.func_lock);
1798 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1799 break;
1800 case NL80211_IFTYPE_AP_VLAN:
1801 case NL80211_IFTYPE_P2P_DEVICE:
1802 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1803 break;
1804 case NL80211_IFTYPE_UNSPECIFIED:
1805 case NL80211_IFTYPE_WDS:
1806 case NUM_NL80211_IFTYPES:
1807 WARN_ON(1);
1808 break;
1809 }
1810
1811 /* need to do this after the switch so vif.type is correct */
1812 ieee80211_link_setup(&sdata->deflink);
1813
1814 ieee80211_debugfs_recreate_netdev(sdata, false);
1815 }
1816
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1817 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1818 enum nl80211_iftype type)
1819 {
1820 struct ieee80211_local *local = sdata->local;
1821 int ret, err;
1822 enum nl80211_iftype internal_type = type;
1823 bool p2p = false;
1824
1825 ASSERT_RTNL();
1826
1827 if (!local->ops->change_interface)
1828 return -EBUSY;
1829
1830 /* for now, don't support changing while links exist */
1831 if (ieee80211_vif_is_mld(&sdata->vif))
1832 return -EBUSY;
1833
1834 switch (sdata->vif.type) {
1835 case NL80211_IFTYPE_AP:
1836 if (!list_empty(&sdata->u.ap.vlans))
1837 return -EBUSY;
1838 break;
1839 case NL80211_IFTYPE_STATION:
1840 case NL80211_IFTYPE_ADHOC:
1841 case NL80211_IFTYPE_OCB:
1842 /*
1843 * Could maybe also all others here?
1844 * Just not sure how that interacts
1845 * with the RX/config path e.g. for
1846 * mesh.
1847 */
1848 break;
1849 default:
1850 return -EBUSY;
1851 }
1852
1853 switch (type) {
1854 case NL80211_IFTYPE_AP:
1855 case NL80211_IFTYPE_STATION:
1856 case NL80211_IFTYPE_ADHOC:
1857 case NL80211_IFTYPE_OCB:
1858 /*
1859 * Could probably support everything
1860 * but here.
1861 */
1862 break;
1863 case NL80211_IFTYPE_P2P_CLIENT:
1864 p2p = true;
1865 internal_type = NL80211_IFTYPE_STATION;
1866 break;
1867 case NL80211_IFTYPE_P2P_GO:
1868 p2p = true;
1869 internal_type = NL80211_IFTYPE_AP;
1870 break;
1871 default:
1872 return -EBUSY;
1873 }
1874
1875 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1876 if (ret)
1877 return ret;
1878
1879 ieee80211_stop_vif_queues(local, sdata,
1880 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1881 /* do_stop will synchronize_rcu() first thing */
1882 ieee80211_do_stop(sdata, false);
1883
1884 ieee80211_teardown_sdata(sdata);
1885
1886 ieee80211_set_sdata_offload_flags(sdata);
1887 ret = drv_change_interface(local, sdata, internal_type, p2p);
1888 if (ret)
1889 type = ieee80211_vif_type_p2p(&sdata->vif);
1890
1891 /*
1892 * Ignore return value here, there's not much we can do since
1893 * the driver changed the interface type internally already.
1894 * The warnings will hopefully make driver authors fix it :-)
1895 */
1896 ieee80211_check_queues(sdata, type);
1897
1898 ieee80211_setup_sdata(sdata, type);
1899 ieee80211_set_vif_encap_ops(sdata);
1900
1901 err = ieee80211_do_open(&sdata->wdev, false);
1902 WARN(err, "type change: do_open returned %d", err);
1903
1904 ieee80211_wake_vif_queues(local, sdata,
1905 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1906 return ret;
1907 }
1908
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1909 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1910 enum nl80211_iftype type)
1911 {
1912 int ret;
1913
1914 ASSERT_RTNL();
1915
1916 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1917 return 0;
1918
1919 if (ieee80211_sdata_running(sdata)) {
1920 ret = ieee80211_runtime_change_iftype(sdata, type);
1921 if (ret)
1922 return ret;
1923 } else {
1924 /* Purge and reset type-dependent state. */
1925 ieee80211_teardown_sdata(sdata);
1926 ieee80211_setup_sdata(sdata, type);
1927 }
1928
1929 /* reset some values that shouldn't be kept across type changes */
1930 if (type == NL80211_IFTYPE_STATION)
1931 sdata->u.mgd.use_4addr = false;
1932
1933 return 0;
1934 }
1935
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1936 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1937 u8 *perm_addr, enum nl80211_iftype type)
1938 {
1939 struct ieee80211_sub_if_data *sdata;
1940 u64 mask, start, addr, val, inc;
1941 u8 *m;
1942 u8 tmp_addr[ETH_ALEN];
1943 int i;
1944
1945 lockdep_assert_wiphy(local->hw.wiphy);
1946
1947 /* default ... something at least */
1948 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1949
1950 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1951 local->hw.wiphy->n_addresses <= 1)
1952 return;
1953
1954 switch (type) {
1955 case NL80211_IFTYPE_MONITOR:
1956 /* doesn't matter */
1957 break;
1958 case NL80211_IFTYPE_AP_VLAN:
1959 /* match up with an AP interface */
1960 list_for_each_entry(sdata, &local->interfaces, list) {
1961 if (sdata->vif.type != NL80211_IFTYPE_AP)
1962 continue;
1963 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1964 break;
1965 }
1966 /* keep default if no AP interface present */
1967 break;
1968 case NL80211_IFTYPE_P2P_CLIENT:
1969 case NL80211_IFTYPE_P2P_GO:
1970 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1971 list_for_each_entry(sdata, &local->interfaces, list) {
1972 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1973 continue;
1974 if (!ieee80211_sdata_running(sdata))
1975 continue;
1976 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1977 return;
1978 }
1979 }
1980 fallthrough;
1981 default:
1982 /* assign a new address if possible -- try n_addresses first */
1983 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1984 bool used = false;
1985
1986 list_for_each_entry(sdata, &local->interfaces, list) {
1987 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1988 sdata->vif.addr)) {
1989 used = true;
1990 break;
1991 }
1992 }
1993
1994 if (!used) {
1995 memcpy(perm_addr,
1996 local->hw.wiphy->addresses[i].addr,
1997 ETH_ALEN);
1998 break;
1999 }
2000 }
2001
2002 /* try mask if available */
2003 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2004 break;
2005
2006 m = local->hw.wiphy->addr_mask;
2007 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2008 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2009 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2010
2011 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2012 /* not a contiguous mask ... not handled now! */
2013 pr_info("not contiguous\n");
2014 break;
2015 }
2016
2017 /*
2018 * Pick address of existing interface in case user changed
2019 * MAC address manually, default to perm_addr.
2020 */
2021 m = local->hw.wiphy->perm_addr;
2022 list_for_each_entry(sdata, &local->interfaces, list) {
2023 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2024 continue;
2025 m = sdata->vif.addr;
2026 break;
2027 }
2028 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2029 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2030 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2031
2032 inc = 1ULL<<__ffs64(mask);
2033 val = (start & mask);
2034 addr = (start & ~mask) | (val & mask);
2035 do {
2036 bool used = false;
2037
2038 tmp_addr[5] = addr >> 0*8;
2039 tmp_addr[4] = addr >> 1*8;
2040 tmp_addr[3] = addr >> 2*8;
2041 tmp_addr[2] = addr >> 3*8;
2042 tmp_addr[1] = addr >> 4*8;
2043 tmp_addr[0] = addr >> 5*8;
2044
2045 val += inc;
2046
2047 list_for_each_entry(sdata, &local->interfaces, list) {
2048 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2049 used = true;
2050 break;
2051 }
2052 }
2053
2054 if (!used) {
2055 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2056 break;
2057 }
2058 addr = (start & ~mask) | (val & mask);
2059 } while (addr != start);
2060
2061 break;
2062 }
2063 }
2064
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)2065 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2066 unsigned char name_assign_type,
2067 struct wireless_dev **new_wdev, enum nl80211_iftype type,
2068 struct vif_params *params)
2069 {
2070 struct net_device *ndev = NULL;
2071 struct ieee80211_sub_if_data *sdata = NULL;
2072 struct txq_info *txqi;
2073 int ret, i;
2074
2075 ASSERT_RTNL();
2076 lockdep_assert_wiphy(local->hw.wiphy);
2077
2078 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2079 struct wireless_dev *wdev;
2080
2081 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2082 GFP_KERNEL);
2083 if (!sdata)
2084 return -ENOMEM;
2085 wdev = &sdata->wdev;
2086
2087 sdata->dev = NULL;
2088 strscpy(sdata->name, name, IFNAMSIZ);
2089 ieee80211_assign_perm_addr(local, wdev->address, type);
2090 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2091 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2092 } else {
2093 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2094 sizeof(void *));
2095 int txq_size = 0;
2096
2097 if (type != NL80211_IFTYPE_AP_VLAN &&
2098 (type != NL80211_IFTYPE_MONITOR ||
2099 (params->flags & MONITOR_FLAG_ACTIVE)))
2100 txq_size += sizeof(struct txq_info) +
2101 local->hw.txq_data_size;
2102
2103 ndev = alloc_netdev_mqs(size + txq_size,
2104 name, name_assign_type,
2105 ieee80211_if_setup, 1, 1);
2106 if (!ndev)
2107 return -ENOMEM;
2108
2109 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2110
2111 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2112
2113 ndev->needed_headroom = local->tx_headroom +
2114 4*6 /* four MAC addresses */
2115 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2116 + 6 /* mesh */
2117 + 8 /* rfc1042/bridge tunnel */
2118 - ETH_HLEN /* ethernet hard_header_len */
2119 + IEEE80211_ENCRYPT_HEADROOM;
2120 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2121
2122 ret = dev_alloc_name(ndev, ndev->name);
2123 if (ret < 0) {
2124 free_netdev(ndev);
2125 return ret;
2126 }
2127
2128 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2129 if (is_valid_ether_addr(params->macaddr))
2130 eth_hw_addr_set(ndev, params->macaddr);
2131 else
2132 eth_hw_addr_set(ndev, ndev->perm_addr);
2133 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2134
2135 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2136 sdata = netdev_priv(ndev);
2137 ndev->ieee80211_ptr = &sdata->wdev;
2138 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2139 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2140 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2141
2142 if (txq_size) {
2143 txqi = netdev_priv(ndev) + size;
2144 ieee80211_txq_init(sdata, NULL, txqi, 0);
2145 }
2146
2147 sdata->dev = ndev;
2148 }
2149
2150 /* initialise type-independent data */
2151 sdata->wdev.wiphy = local->hw.wiphy;
2152
2153 ieee80211_sdata_init(local, sdata);
2154
2155 ieee80211_init_frag_cache(&sdata->frags);
2156
2157 INIT_LIST_HEAD(&sdata->key_list);
2158
2159 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk,
2160 ieee80211_delayed_tailroom_dec);
2161
2162 for (i = 0; i < NUM_NL80211_BANDS; i++) {
2163 struct ieee80211_supported_band *sband;
2164 sband = local->hw.wiphy->bands[i];
2165 sdata->rc_rateidx_mask[i] =
2166 sband ? (1 << sband->n_bitrates) - 1 : 0;
2167 if (sband) {
2168 __le16 cap;
2169 u16 *vht_rate_mask;
2170
2171 memcpy(sdata->rc_rateidx_mcs_mask[i],
2172 sband->ht_cap.mcs.rx_mask,
2173 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2174
2175 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2176 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2177 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2178 } else {
2179 memset(sdata->rc_rateidx_mcs_mask[i], 0,
2180 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2181 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2182 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2183 }
2184 }
2185
2186 ieee80211_set_default_queues(sdata);
2187
2188 /* setup type-dependent data */
2189 ieee80211_setup_sdata(sdata, type);
2190
2191 if (ndev) {
2192 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2193 if (type == NL80211_IFTYPE_STATION)
2194 sdata->u.mgd.use_4addr = params->use_4addr;
2195
2196 ndev->features |= local->hw.netdev_features;
2197 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2198 ndev->hw_features |= ndev->features &
2199 MAC80211_SUPPORTED_FEATURES_TX;
2200 sdata->vif.netdev_features = local->hw.netdev_features;
2201
2202 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2203
2204 /* MTU range is normally 256 - 2304, where the upper limit is
2205 * the maximum MSDU size. Monitor interfaces send and receive
2206 * MPDU and A-MSDU frames which may be much larger so we do
2207 * not impose an upper limit in that case.
2208 */
2209 ndev->min_mtu = 256;
2210 if (type == NL80211_IFTYPE_MONITOR)
2211 ndev->max_mtu = 0;
2212 else
2213 ndev->max_mtu = local->hw.max_mtu;
2214
2215 ret = cfg80211_register_netdevice(ndev);
2216 if (ret) {
2217 free_netdev(ndev);
2218 return ret;
2219 }
2220 }
2221
2222 mutex_lock(&local->iflist_mtx);
2223 list_add_tail_rcu(&sdata->list, &local->interfaces);
2224 mutex_unlock(&local->iflist_mtx);
2225
2226 if (new_wdev)
2227 *new_wdev = &sdata->wdev;
2228
2229 return 0;
2230 }
2231
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2232 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2233 {
2234 ASSERT_RTNL();
2235 lockdep_assert_wiphy(sdata->local->hw.wiphy);
2236
2237 mutex_lock(&sdata->local->iflist_mtx);
2238 list_del_rcu(&sdata->list);
2239 mutex_unlock(&sdata->local->iflist_mtx);
2240
2241 if (sdata->vif.txq)
2242 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2243
2244 synchronize_rcu();
2245
2246 cfg80211_unregister_wdev(&sdata->wdev);
2247
2248 if (!sdata->dev) {
2249 ieee80211_teardown_sdata(sdata);
2250 kfree(sdata);
2251 }
2252 }
2253
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2254 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2255 {
2256 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2257 return;
2258 ieee80211_do_stop(sdata, true);
2259 }
2260
ieee80211_remove_interfaces(struct ieee80211_local * local)2261 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2262 {
2263 struct ieee80211_sub_if_data *sdata, *tmp;
2264 LIST_HEAD(unreg_list);
2265
2266 ASSERT_RTNL();
2267
2268 /* Before destroying the interfaces, make sure they're all stopped so
2269 * that the hardware is stopped. Otherwise, the driver might still be
2270 * iterating the interfaces during the shutdown, e.g. from a worker
2271 * or from RX processing or similar, and if it does so (using atomic
2272 * iteration) while we're manipulating the list, the iteration will
2273 * crash.
2274 *
2275 * After this, the hardware should be stopped and the driver should
2276 * have stopped all of its activities, so that we can do RCU-unaware
2277 * manipulations of the interface list below.
2278 */
2279 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2280
2281 guard(wiphy)(local->hw.wiphy);
2282
2283 WARN(local->open_count, "%s: open count remains %d\n",
2284 wiphy_name(local->hw.wiphy), local->open_count);
2285
2286 mutex_lock(&local->iflist_mtx);
2287 list_splice_init(&local->interfaces, &unreg_list);
2288 mutex_unlock(&local->iflist_mtx);
2289
2290 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2291 bool netdev = sdata->dev;
2292
2293 /*
2294 * Remove IP addresses explicitly, since the notifier will
2295 * skip the callbacks if wdev->registered is false, since
2296 * we can't acquire the wiphy_lock() again there if already
2297 * inside this locked section.
2298 */
2299 sdata->vif.cfg.arp_addr_cnt = 0;
2300 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2301 sdata->u.mgd.associated)
2302 ieee80211_vif_cfg_change_notify(sdata,
2303 BSS_CHANGED_ARP_FILTER);
2304
2305 list_del(&sdata->list);
2306 cfg80211_unregister_wdev(&sdata->wdev);
2307
2308 if (!netdev)
2309 kfree(sdata);
2310 }
2311 }
2312
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2313 static int netdev_notify(struct notifier_block *nb,
2314 unsigned long state, void *ptr)
2315 {
2316 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2317 struct ieee80211_sub_if_data *sdata;
2318
2319 if (state != NETDEV_CHANGENAME)
2320 return NOTIFY_DONE;
2321
2322 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2323 return NOTIFY_DONE;
2324
2325 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2326 return NOTIFY_DONE;
2327
2328 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2329 memcpy(sdata->name, dev->name, IFNAMSIZ);
2330 ieee80211_debugfs_rename_netdev(sdata);
2331
2332 return NOTIFY_OK;
2333 }
2334
2335 static struct notifier_block mac80211_netdev_notifier = {
2336 .notifier_call = netdev_notify,
2337 };
2338
ieee80211_iface_init(void)2339 int ieee80211_iface_init(void)
2340 {
2341 return register_netdevice_notifier(&mac80211_netdev_notifier);
2342 }
2343
ieee80211_iface_exit(void)2344 void ieee80211_iface_exit(void)
2345 {
2346 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2347 }
2348
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2349 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2350 {
2351 if (sdata->vif.type == NL80211_IFTYPE_AP)
2352 atomic_inc(&sdata->u.ap.num_mcast_sta);
2353 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2354 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2355 }
2356
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2357 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2358 {
2359 if (sdata->vif.type == NL80211_IFTYPE_AP)
2360 atomic_dec(&sdata->u.ap.num_mcast_sta);
2361 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2362 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2363 }
2364
ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data * sdata)2365 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata)
2366 {
2367 struct ieee80211_local *local = sdata->local;
2368
2369 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA))
2370 return;
2371
2372 ieee80211_stop_vif_queues_norefcount(local, sdata,
2373 IEEE80211_QUEUE_STOP_REASON_CSA);
2374 }
2375
ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data * sdata)2376 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata)
2377 {
2378 struct ieee80211_local *local = sdata->local;
2379
2380 ieee80211_wake_vif_queues_norefcount(local, sdata,
2381 IEEE80211_QUEUE_STOP_REASON_CSA);
2382 }
2383