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) 2018-2023 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 wiphy *wiphy, struct wiphy_work *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->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->deflink.user_power_level);
65
66 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 power = min(power, sdata->deflink.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_link_info_change_notify(sdata, &sdata->deflink,
84 BSS_CHANGED_TXPOWER);
85 }
86
__ieee80211_idle_off(struct ieee80211_local * local)87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
88 {
89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 return 0;
91
92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 return IEEE80211_CONF_CHANGE_IDLE;
94 }
95
__ieee80211_idle_on(struct ieee80211_local * local)96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
97 {
98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 return 0;
100
101 ieee80211_flush_queues(local, NULL, false);
102
103 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 return IEEE80211_CONF_CHANGE_IDLE;
105 }
106
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 bool force_active)
109 {
110 bool working, scanning, active;
111 unsigned int led_trig_start = 0, led_trig_stop = 0;
112
113 lockdep_assert_held(&local->mtx);
114
115 active = force_active ||
116 !list_empty(&local->chanctx_list) ||
117 local->monitors;
118
119 working = !local->ops->remain_on_channel &&
120 !list_empty(&local->roc_list);
121
122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124
125 if (working || scanning)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129
130 if (active)
131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 else
133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134
135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136
137 if (working || scanning || active)
138 return __ieee80211_idle_off(local);
139 return __ieee80211_idle_on(local);
140 }
141
ieee80211_idle_off(struct ieee80211_local * local)142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 return __ieee80211_recalc_idle(local, true);
145 }
146
ieee80211_recalc_idle(struct ieee80211_local * local)147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149 u32 change = __ieee80211_recalc_idle(local, false);
150 if (change)
151 ieee80211_hw_config(local, change);
152 }
153
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155 bool check_dup)
156 {
157 struct ieee80211_local *local = sdata->local;
158 struct ieee80211_sub_if_data *iter;
159 u64 new, mask, tmp;
160 u8 *m;
161 int ret = 0;
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 mutex_lock(&local->iflist_mtx);
180 list_for_each_entry(iter, &local->interfaces, list) {
181 if (iter == sdata)
182 continue;
183
184 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186 continue;
187
188 m = iter->vif.addr;
189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192
193 if ((new & ~mask) != (tmp & ~mask)) {
194 ret = -EINVAL;
195 break;
196 }
197 }
198 mutex_unlock(&local->iflist_mtx);
199
200 return ret;
201 }
202
ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
204 {
205 struct ieee80211_roc_work *roc;
206 struct ieee80211_local *local = sdata->local;
207 struct ieee80211_sub_if_data *scan_sdata;
208 int ret = 0;
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 mutex_lock(&local->mtx);
218
219 /* First check no ROC work is happening on this iface */
220 list_for_each_entry(roc, &local->roc_list, list) {
221 if (roc->sdata != sdata)
222 continue;
223
224 if (roc->started) {
225 ret = -EBUSY;
226 goto unlock;
227 }
228 }
229
230 /* And if this iface is scanning */
231 if (local->scanning) {
232 scan_sdata = rcu_dereference_protected(local->scan_sdata,
233 lockdep_is_held(&local->mtx));
234 if (sdata == scan_sdata)
235 ret = -EBUSY;
236 }
237
238 switch (sdata->vif.type) {
239 case NL80211_IFTYPE_STATION:
240 case NL80211_IFTYPE_P2P_CLIENT:
241 /* More interface types could be added here but changing the
242 * address while powered makes the most sense in client modes.
243 */
244 break;
245 default:
246 ret = -EOPNOTSUPP;
247 }
248
249 unlock:
250 mutex_unlock(&local->mtx);
251 return ret;
252 }
253
ieee80211_change_mac(struct net_device * dev,void * addr)254 static int ieee80211_change_mac(struct net_device *dev, void *addr)
255 {
256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
257 struct ieee80211_local *local = sdata->local;
258 struct sockaddr *sa = addr;
259 bool check_dup = true;
260 bool live = false;
261 int ret;
262
263 if (ieee80211_sdata_running(sdata)) {
264 ret = ieee80211_can_powered_addr_change(sdata);
265 if (ret)
266 return ret;
267
268 live = true;
269 }
270
271 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
272 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
273 check_dup = false;
274
275 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
276 if (ret)
277 return ret;
278
279 if (live)
280 drv_remove_interface(local, sdata);
281 ret = eth_mac_addr(dev, sa);
282
283 if (ret == 0) {
284 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
285 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
286 }
287
288 /* Regardless of eth_mac_addr() return we still want to add the
289 * interface back. This should not fail...
290 */
291 if (live)
292 WARN_ON(drv_add_interface(local, sdata));
293
294 return ret;
295 }
296
identical_mac_addr_allowed(int type1,int type2)297 static inline int identical_mac_addr_allowed(int type1, int type2)
298 {
299 return type1 == NL80211_IFTYPE_MONITOR ||
300 type2 == NL80211_IFTYPE_MONITOR ||
301 type1 == NL80211_IFTYPE_P2P_DEVICE ||
302 type2 == NL80211_IFTYPE_P2P_DEVICE ||
303 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
304 (type1 == NL80211_IFTYPE_AP_VLAN &&
305 (type2 == NL80211_IFTYPE_AP ||
306 type2 == NL80211_IFTYPE_AP_VLAN));
307 }
308
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)309 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
310 enum nl80211_iftype iftype)
311 {
312 struct ieee80211_local *local = sdata->local;
313 struct ieee80211_sub_if_data *nsdata;
314 int ret;
315
316 ASSERT_RTNL();
317
318 /* we hold the RTNL here so can safely walk the list */
319 list_for_each_entry(nsdata, &local->interfaces, list) {
320 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
321 /*
322 * Only OCB and monitor mode may coexist
323 */
324 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
325 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
326 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
327 nsdata->vif.type == NL80211_IFTYPE_OCB))
328 return -EBUSY;
329
330 /*
331 * Allow only a single IBSS interface to be up at any
332 * time. This is restricted because beacon distribution
333 * cannot work properly if both are in the same IBSS.
334 *
335 * To remove this restriction we'd have to disallow them
336 * from setting the same SSID on different IBSS interfaces
337 * belonging to the same hardware. Then, however, we're
338 * faced with having to adopt two different TSF timers...
339 */
340 if (iftype == NL80211_IFTYPE_ADHOC &&
341 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
342 return -EBUSY;
343 /*
344 * will not add another interface while any channel
345 * switch is active.
346 */
347 if (nsdata->vif.bss_conf.csa_active)
348 return -EBUSY;
349
350 /*
351 * The remaining checks are only performed for interfaces
352 * with the same MAC address.
353 */
354 if (!ether_addr_equal(sdata->vif.addr,
355 nsdata->vif.addr))
356 continue;
357
358 /*
359 * check whether it may have the same address
360 */
361 if (!identical_mac_addr_allowed(iftype,
362 nsdata->vif.type))
363 return -ENOTUNIQ;
364
365 /* No support for VLAN with MLO yet */
366 if (iftype == NL80211_IFTYPE_AP_VLAN &&
367 sdata->wdev.use_4addr &&
368 nsdata->vif.type == NL80211_IFTYPE_AP &&
369 nsdata->vif.valid_links)
370 return -EOPNOTSUPP;
371
372 /*
373 * can only add VLANs to enabled APs
374 */
375 if (iftype == NL80211_IFTYPE_AP_VLAN &&
376 nsdata->vif.type == NL80211_IFTYPE_AP)
377 sdata->bss = &nsdata->u.ap;
378 }
379 }
380
381 mutex_lock(&local->chanctx_mtx);
382 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
383 mutex_unlock(&local->chanctx_mtx);
384 return ret;
385 }
386
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)387 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
388 enum nl80211_iftype iftype)
389 {
390 int n_queues = sdata->local->hw.queues;
391 int i;
392
393 if (iftype == NL80211_IFTYPE_NAN)
394 return 0;
395
396 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
397 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
398 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
399 IEEE80211_INVAL_HW_QUEUE))
400 return -EINVAL;
401 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
402 n_queues))
403 return -EINVAL;
404 }
405 }
406
407 if ((iftype != NL80211_IFTYPE_AP &&
408 iftype != NL80211_IFTYPE_P2P_GO &&
409 iftype != NL80211_IFTYPE_MESH_POINT) ||
410 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
411 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
412 return 0;
413 }
414
415 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
416 return -EINVAL;
417
418 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
419 return -EINVAL;
420
421 return 0;
422 }
423
ieee80211_open(struct net_device * dev)424 static int ieee80211_open(struct net_device *dev)
425 {
426 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
427 int err;
428
429 /* fail early if user set an invalid address */
430 if (!is_valid_ether_addr(dev->dev_addr))
431 return -EADDRNOTAVAIL;
432
433 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
434 if (err)
435 return err;
436
437 wiphy_lock(sdata->local->hw.wiphy);
438 err = ieee80211_do_open(&sdata->wdev, true);
439 wiphy_unlock(sdata->local->hw.wiphy);
440
441 return err;
442 }
443
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)444 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
445 {
446 struct ieee80211_local *local = sdata->local;
447 unsigned long flags;
448 struct sk_buff *skb, *tmp;
449 u32 hw_reconf_flags = 0;
450 int i, flushed;
451 struct ps_data *ps;
452 struct cfg80211_chan_def chandef;
453 bool cancel_scan;
454 struct cfg80211_nan_func *func;
455
456 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
457 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
458
459 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
460 if (cancel_scan)
461 ieee80211_scan_cancel(local);
462
463 ieee80211_roc_purge(local, sdata);
464
465 switch (sdata->vif.type) {
466 case NL80211_IFTYPE_STATION:
467 ieee80211_mgd_stop(sdata);
468 break;
469 case NL80211_IFTYPE_ADHOC:
470 ieee80211_ibss_stop(sdata);
471 break;
472 case NL80211_IFTYPE_MONITOR:
473 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
474 break;
475 list_del_rcu(&sdata->u.mntr.list);
476 break;
477 default:
478 break;
479 }
480
481 /*
482 * Remove all stations associated with this interface.
483 *
484 * This must be done before calling ops->remove_interface()
485 * because otherwise we can later invoke ops->sta_notify()
486 * whenever the STAs are removed, and that invalidates driver
487 * assumptions about always getting a vif pointer that is valid
488 * (because if we remove a STA after ops->remove_interface()
489 * the driver will have removed the vif info already!)
490 *
491 * For AP_VLANs stations may exist since there's nothing else that
492 * would have removed them, but in other modes there shouldn't
493 * be any stations.
494 */
495 flushed = sta_info_flush(sdata);
496 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
497
498 /* don't count this interface for allmulti while it is down */
499 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
500 atomic_dec(&local->iff_allmultis);
501
502 if (sdata->vif.type == NL80211_IFTYPE_AP) {
503 local->fif_pspoll--;
504 local->fif_probe_req--;
505 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
506 local->fif_probe_req--;
507 }
508
509 if (sdata->dev) {
510 netif_addr_lock_bh(sdata->dev);
511 spin_lock_bh(&local->filter_lock);
512 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
513 sdata->dev->addr_len);
514 spin_unlock_bh(&local->filter_lock);
515 netif_addr_unlock_bh(sdata->dev);
516 }
517
518 del_timer_sync(&local->dynamic_ps_timer);
519 cancel_work_sync(&local->dynamic_ps_enable_work);
520
521 cancel_work_sync(&sdata->recalc_smps);
522
523 sdata_lock(sdata);
524 WARN(ieee80211_vif_is_mld(&sdata->vif),
525 "destroying interface with valid links 0x%04x\n",
526 sdata->vif.valid_links);
527
528 mutex_lock(&local->mtx);
529 sdata->vif.bss_conf.csa_active = false;
530 if (sdata->vif.type == NL80211_IFTYPE_STATION)
531 sdata->deflink.u.mgd.csa_waiting_bcn = false;
532 if (sdata->deflink.csa_block_tx) {
533 ieee80211_wake_vif_queues(local, sdata,
534 IEEE80211_QUEUE_STOP_REASON_CSA);
535 sdata->deflink.csa_block_tx = false;
536 }
537 mutex_unlock(&local->mtx);
538 sdata_unlock(sdata);
539
540 cancel_work_sync(&sdata->deflink.csa_finalize_work);
541 cancel_work_sync(&sdata->deflink.color_change_finalize_work);
542
543 cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
544
545 if (sdata->wdev.cac_started) {
546 chandef = sdata->vif.bss_conf.chandef;
547 WARN_ON(local->suspended);
548 mutex_lock(&local->mtx);
549 ieee80211_link_release_channel(&sdata->deflink);
550 mutex_unlock(&local->mtx);
551 cfg80211_cac_event(sdata->dev, &chandef,
552 NL80211_RADAR_CAC_ABORTED,
553 GFP_KERNEL);
554 }
555
556 if (sdata->vif.type == NL80211_IFTYPE_AP) {
557 WARN_ON(!list_empty(&sdata->u.ap.vlans));
558 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
559 /* remove all packets in parent bc_buf pointing to this dev */
560 ps = &sdata->bss->ps;
561
562 spin_lock_irqsave(&ps->bc_buf.lock, flags);
563 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
564 if (skb->dev == sdata->dev) {
565 __skb_unlink(skb, &ps->bc_buf);
566 local->total_ps_buffered--;
567 ieee80211_free_txskb(&local->hw, skb);
568 }
569 }
570 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
571 }
572
573 if (going_down)
574 local->open_count--;
575
576 switch (sdata->vif.type) {
577 case NL80211_IFTYPE_AP_VLAN:
578 mutex_lock(&local->mtx);
579 list_del(&sdata->u.vlan.list);
580 mutex_unlock(&local->mtx);
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 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
635 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
636 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
637 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
638 if (info->control.vif == &sdata->vif) {
639 __skb_unlink(skb, &local->pending[i]);
640 ieee80211_free_txskb(&local->hw, skb);
641 }
642 }
643 }
644 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
645
646 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
647 ieee80211_txq_remove_vlan(local, sdata);
648
649 sdata->bss = NULL;
650
651 if (local->open_count == 0)
652 ieee80211_clear_tx_pending(local);
653
654 sdata->vif.bss_conf.beacon_int = 0;
655
656 /*
657 * If the interface goes down while suspended, presumably because
658 * the device was unplugged and that happens before our resume,
659 * then the driver is already unconfigured and the remainder of
660 * this function isn't needed.
661 * XXX: what about WoWLAN? If the device has software state, e.g.
662 * memory allocated, it might expect teardown commands from
663 * mac80211 here?
664 */
665 if (local->suspended) {
666 WARN_ON(local->wowlan);
667 WARN_ON(rcu_access_pointer(local->monitor_sdata));
668 return;
669 }
670
671 switch (sdata->vif.type) {
672 case NL80211_IFTYPE_AP_VLAN:
673 break;
674 case NL80211_IFTYPE_MONITOR:
675 if (local->monitors == 0)
676 ieee80211_del_virtual_monitor(local);
677
678 mutex_lock(&local->mtx);
679 ieee80211_recalc_idle(local);
680 mutex_unlock(&local->mtx);
681
682 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
683 break;
684
685 fallthrough;
686 default:
687 if (going_down)
688 drv_remove_interface(local, sdata);
689 }
690
691 ieee80211_recalc_ps(local);
692
693 if (cancel_scan)
694 flush_delayed_work(&local->scan_work);
695
696 if (local->open_count == 0) {
697 ieee80211_stop_device(local);
698
699 /* no reconfiguring after stop! */
700 return;
701 }
702
703 /* do after stop to avoid reconfiguring when we stop anyway */
704 ieee80211_configure_filter(local);
705 ieee80211_hw_config(local, hw_reconf_flags);
706
707 if (local->monitors == local->open_count)
708 ieee80211_add_virtual_monitor(local);
709 }
710
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)711 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
712 {
713 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
714 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
715
716 if (!tx_vif)
717 return;
718
719 tx_sdata = vif_to_sdata(tx_vif);
720 sdata->vif.mbssid_tx_vif = NULL;
721
722 list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
723 &tx_sdata->local->interfaces, list) {
724 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
725 non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
726 ieee80211_sdata_running(non_tx_sdata)) {
727 non_tx_sdata->vif.mbssid_tx_vif = NULL;
728 dev_close(non_tx_sdata->wdev.netdev);
729 }
730 }
731
732 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
733 tx_sdata->vif.mbssid_tx_vif = NULL;
734 dev_close(tx_sdata->wdev.netdev);
735 }
736 }
737
ieee80211_stop(struct net_device * dev)738 static int ieee80211_stop(struct net_device *dev)
739 {
740 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
741
742 /* close dependent VLAN and MBSSID interfaces before locking wiphy */
743 if (sdata->vif.type == NL80211_IFTYPE_AP) {
744 struct ieee80211_sub_if_data *vlan, *tmpsdata;
745
746 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
747 u.vlan.list)
748 dev_close(vlan->dev);
749
750 ieee80211_stop_mbssid(sdata);
751 }
752
753 cancel_work_sync(&sdata->activate_links_work);
754
755 wiphy_lock(sdata->local->hw.wiphy);
756 ieee80211_do_stop(sdata, true);
757 wiphy_unlock(sdata->local->hw.wiphy);
758
759 return 0;
760 }
761
ieee80211_set_multicast_list(struct net_device * dev)762 static void ieee80211_set_multicast_list(struct net_device *dev)
763 {
764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
765 struct ieee80211_local *local = sdata->local;
766 int allmulti, sdata_allmulti;
767
768 allmulti = !!(dev->flags & IFF_ALLMULTI);
769 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
770
771 if (allmulti != sdata_allmulti) {
772 if (dev->flags & IFF_ALLMULTI)
773 atomic_inc(&local->iff_allmultis);
774 else
775 atomic_dec(&local->iff_allmultis);
776 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
777 }
778
779 spin_lock_bh(&local->filter_lock);
780 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
781 spin_unlock_bh(&local->filter_lock);
782 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
783 }
784
785 /*
786 * Called when the netdev is removed or, by the code below, before
787 * the interface type changes.
788 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)789 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
790 {
791 /* free extra data */
792 ieee80211_free_keys(sdata, false);
793
794 ieee80211_debugfs_remove_netdev(sdata);
795
796 ieee80211_destroy_frag_cache(&sdata->frags);
797
798 if (ieee80211_vif_is_mesh(&sdata->vif))
799 ieee80211_mesh_teardown_sdata(sdata);
800
801 ieee80211_vif_clear_links(sdata);
802 ieee80211_link_stop(&sdata->deflink);
803 }
804
ieee80211_uninit(struct net_device * dev)805 static void ieee80211_uninit(struct net_device *dev)
806 {
807 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
808 }
809
810 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)811 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
812 {
813 dev_fetch_sw_netstats(stats, dev->tstats);
814 }
815
ieee80211_netdev_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)816 static int ieee80211_netdev_setup_tc(struct net_device *dev,
817 enum tc_setup_type type, void *type_data)
818 {
819 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
820 struct ieee80211_local *local = sdata->local;
821
822 return drv_net_setup_tc(local, sdata, dev, type, type_data);
823 }
824
825 static const struct net_device_ops ieee80211_dataif_ops = {
826 .ndo_open = ieee80211_open,
827 .ndo_stop = ieee80211_stop,
828 .ndo_uninit = ieee80211_uninit,
829 .ndo_start_xmit = ieee80211_subif_start_xmit,
830 .ndo_set_rx_mode = ieee80211_set_multicast_list,
831 .ndo_set_mac_address = ieee80211_change_mac,
832 .ndo_get_stats64 = ieee80211_get_stats64,
833 .ndo_setup_tc = ieee80211_netdev_setup_tc,
834 };
835
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)836 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
837 struct sk_buff *skb,
838 struct net_device *sb_dev)
839 {
840 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
841 struct ieee80211_local *local = sdata->local;
842 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
843 struct ieee80211_hdr *hdr;
844 int len_rthdr;
845
846 if (local->hw.queues < IEEE80211_NUM_ACS)
847 return 0;
848
849 /* reset flags and info before parsing radiotap header */
850 memset(info, 0, sizeof(*info));
851
852 if (!ieee80211_parse_tx_radiotap(skb, dev))
853 return 0; /* doesn't matter, frame will be dropped */
854
855 len_rthdr = ieee80211_get_radiotap_len(skb->data);
856 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
857 if (skb->len < len_rthdr + 2 ||
858 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
859 return 0; /* doesn't matter, frame will be dropped */
860
861 return ieee80211_select_queue_80211(sdata, skb, hdr);
862 }
863
864 static const struct net_device_ops ieee80211_monitorif_ops = {
865 .ndo_open = ieee80211_open,
866 .ndo_stop = ieee80211_stop,
867 .ndo_uninit = ieee80211_uninit,
868 .ndo_start_xmit = ieee80211_monitor_start_xmit,
869 .ndo_set_rx_mode = ieee80211_set_multicast_list,
870 .ndo_set_mac_address = ieee80211_change_mac,
871 .ndo_select_queue = ieee80211_monitor_select_queue,
872 .ndo_get_stats64 = ieee80211_get_stats64,
873 };
874
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)875 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
876 struct net_device_path *path)
877 {
878 struct ieee80211_sub_if_data *sdata;
879 struct ieee80211_local *local;
880 struct sta_info *sta;
881 int ret = -ENOENT;
882
883 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
884 local = sdata->local;
885
886 if (!local->ops->net_fill_forward_path)
887 return -EOPNOTSUPP;
888
889 rcu_read_lock();
890 switch (sdata->vif.type) {
891 case NL80211_IFTYPE_AP_VLAN:
892 sta = rcu_dereference(sdata->u.vlan.sta);
893 if (sta)
894 break;
895 if (sdata->wdev.use_4addr)
896 goto out;
897 if (is_multicast_ether_addr(ctx->daddr))
898 goto out;
899 sta = sta_info_get_bss(sdata, ctx->daddr);
900 break;
901 case NL80211_IFTYPE_AP:
902 if (is_multicast_ether_addr(ctx->daddr))
903 goto out;
904 sta = sta_info_get(sdata, ctx->daddr);
905 break;
906 case NL80211_IFTYPE_STATION:
907 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
908 sta = sta_info_get(sdata, ctx->daddr);
909 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
910 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
911 goto out;
912
913 break;
914 }
915 }
916
917 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
918 break;
919 default:
920 goto out;
921 }
922
923 if (!sta)
924 goto out;
925
926 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
927 out:
928 rcu_read_unlock();
929
930 return ret;
931 }
932
933 static const struct net_device_ops ieee80211_dataif_8023_ops = {
934 .ndo_open = ieee80211_open,
935 .ndo_stop = ieee80211_stop,
936 .ndo_uninit = ieee80211_uninit,
937 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
938 .ndo_set_rx_mode = ieee80211_set_multicast_list,
939 .ndo_set_mac_address = ieee80211_change_mac,
940 .ndo_get_stats64 = ieee80211_get_stats64,
941 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
942 .ndo_setup_tc = ieee80211_netdev_setup_tc,
943 };
944
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)945 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
946 {
947 switch (iftype) {
948 /* P2P GO and client are mapped to AP/STATION types */
949 case NL80211_IFTYPE_AP:
950 case NL80211_IFTYPE_STATION:
951 return true;
952 default:
953 return false;
954 }
955 }
956
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)957 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
958 {
959 struct ieee80211_local *local = sdata->local;
960 u32 flags;
961
962 flags = sdata->vif.offload_flags;
963
964 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
965 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
966 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
967
968 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
969 local->hw.wiphy->frag_threshold != (u32)-1)
970 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
971
972 if (local->monitors)
973 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
974 } else {
975 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
976 }
977
978 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
979 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
980 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
981
982 if (local->monitors &&
983 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
984 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
985 } else {
986 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
987 }
988
989 if (sdata->vif.offload_flags == flags)
990 return false;
991
992 sdata->vif.offload_flags = flags;
993 ieee80211_check_fast_rx_iface(sdata);
994 return true;
995 }
996
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)997 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
998 {
999 struct ieee80211_local *local = sdata->local;
1000 struct ieee80211_sub_if_data *bss = sdata;
1001 bool enabled;
1002
1003 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1004 if (!sdata->bss)
1005 return;
1006
1007 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1008 }
1009
1010 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1011 !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1012 return;
1013
1014 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1015 if (sdata->wdev.use_4addr &&
1016 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1017 enabled = false;
1018
1019 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1020 &ieee80211_dataif_ops;
1021 }
1022
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1023 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1024 {
1025 struct ieee80211_local *local = sdata->local;
1026 struct ieee80211_sub_if_data *vsdata;
1027
1028 if (ieee80211_set_sdata_offload_flags(sdata)) {
1029 drv_update_vif_offload(local, sdata);
1030 ieee80211_set_vif_encap_ops(sdata);
1031 }
1032
1033 list_for_each_entry(vsdata, &local->interfaces, list) {
1034 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1035 vsdata->bss != &sdata->u.ap)
1036 continue;
1037
1038 ieee80211_set_vif_encap_ops(vsdata);
1039 }
1040 }
1041
ieee80211_recalc_offload(struct ieee80211_local * local)1042 void ieee80211_recalc_offload(struct ieee80211_local *local)
1043 {
1044 struct ieee80211_sub_if_data *sdata;
1045
1046 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1047 return;
1048
1049 mutex_lock(&local->iflist_mtx);
1050
1051 list_for_each_entry(sdata, &local->interfaces, list) {
1052 if (!ieee80211_sdata_running(sdata))
1053 continue;
1054
1055 ieee80211_recalc_sdata_offload(sdata);
1056 }
1057
1058 mutex_unlock(&local->iflist_mtx);
1059 }
1060
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1061 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1062 const int offset)
1063 {
1064 struct ieee80211_local *local = sdata->local;
1065 u32 flags = sdata->u.mntr.flags;
1066
1067 #define ADJUST(_f, _s) do { \
1068 if (flags & MONITOR_FLAG_##_f) \
1069 local->fif_##_s += offset; \
1070 } while (0)
1071
1072 ADJUST(FCSFAIL, fcsfail);
1073 ADJUST(PLCPFAIL, plcpfail);
1074 ADJUST(CONTROL, control);
1075 ADJUST(CONTROL, pspoll);
1076 ADJUST(OTHER_BSS, other_bss);
1077
1078 #undef ADJUST
1079 }
1080
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1081 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1082 {
1083 struct ieee80211_local *local = sdata->local;
1084 int i;
1085
1086 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1087 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1088 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1089 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1090 sdata->vif.hw_queue[i] = i;
1091 else
1092 sdata->vif.hw_queue[i] = 0;
1093 }
1094 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1095 }
1096
ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1097 static void ieee80211_sdata_init(struct ieee80211_local *local,
1098 struct ieee80211_sub_if_data *sdata)
1099 {
1100 sdata->local = local;
1101
1102 /*
1103 * Initialize the default link, so we can use link_id 0 for non-MLD,
1104 * and that continues to work for non-MLD-aware drivers that use just
1105 * vif.bss_conf instead of vif.link_conf.
1106 *
1107 * Note that we never change this, so if link ID 0 isn't used in an
1108 * MLD connection, we get a separate allocation for it.
1109 */
1110 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1111 }
1112
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1113 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1114 {
1115 struct ieee80211_sub_if_data *sdata;
1116 int ret;
1117
1118 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1119 return 0;
1120
1121 ASSERT_RTNL();
1122 lockdep_assert_wiphy(local->hw.wiphy);
1123
1124 if (local->monitor_sdata)
1125 return 0;
1126
1127 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1128 if (!sdata)
1129 return -ENOMEM;
1130
1131 /* set up data */
1132 sdata->vif.type = NL80211_IFTYPE_MONITOR;
1133 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1134 wiphy_name(local->hw.wiphy));
1135 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1136 mutex_init(&sdata->wdev.mtx);
1137
1138 ieee80211_sdata_init(local, sdata);
1139
1140 ieee80211_set_default_queues(sdata);
1141
1142 ret = drv_add_interface(local, sdata);
1143 if (WARN_ON(ret)) {
1144 /* ok .. stupid driver, it asked for this! */
1145 kfree(sdata);
1146 return ret;
1147 }
1148
1149 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1150
1151 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1152 if (ret) {
1153 kfree(sdata);
1154 return ret;
1155 }
1156
1157 mutex_lock(&local->iflist_mtx);
1158 rcu_assign_pointer(local->monitor_sdata, sdata);
1159 mutex_unlock(&local->iflist_mtx);
1160
1161 sdata_lock(sdata);
1162 mutex_lock(&local->mtx);
1163 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1164 IEEE80211_CHANCTX_EXCLUSIVE);
1165 mutex_unlock(&local->mtx);
1166 sdata_unlock(sdata);
1167 if (ret) {
1168 mutex_lock(&local->iflist_mtx);
1169 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1170 mutex_unlock(&local->iflist_mtx);
1171 synchronize_net();
1172 drv_remove_interface(local, sdata);
1173 mutex_destroy(&sdata->wdev.mtx);
1174 kfree(sdata);
1175 return ret;
1176 }
1177
1178 skb_queue_head_init(&sdata->skb_queue);
1179 skb_queue_head_init(&sdata->status_queue);
1180 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1181
1182 return 0;
1183 }
1184
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1185 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1186 {
1187 struct ieee80211_sub_if_data *sdata;
1188
1189 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1190 return;
1191
1192 ASSERT_RTNL();
1193 lockdep_assert_wiphy(local->hw.wiphy);
1194
1195 mutex_lock(&local->iflist_mtx);
1196
1197 sdata = rcu_dereference_protected(local->monitor_sdata,
1198 lockdep_is_held(&local->iflist_mtx));
1199 if (!sdata) {
1200 mutex_unlock(&local->iflist_mtx);
1201 return;
1202 }
1203
1204 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1205 mutex_unlock(&local->iflist_mtx);
1206
1207 synchronize_net();
1208
1209 sdata_lock(sdata);
1210 mutex_lock(&local->mtx);
1211 ieee80211_link_release_channel(&sdata->deflink);
1212 mutex_unlock(&local->mtx);
1213 sdata_unlock(sdata);
1214
1215 drv_remove_interface(local, sdata);
1216
1217 mutex_destroy(&sdata->wdev.mtx);
1218 kfree(sdata);
1219 }
1220
1221 /*
1222 * NOTE: Be very careful when changing this function, it must NOT return
1223 * an error on interface type changes that have been pre-checked, so most
1224 * checks should be in ieee80211_check_concurrent_iface.
1225 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1226 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1227 {
1228 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1229 struct net_device *dev = wdev->netdev;
1230 struct ieee80211_local *local = sdata->local;
1231 u64 changed = 0;
1232 int res;
1233 u32 hw_reconf_flags = 0;
1234
1235 switch (sdata->vif.type) {
1236 case NL80211_IFTYPE_AP_VLAN: {
1237 struct ieee80211_sub_if_data *master;
1238
1239 if (!sdata->bss)
1240 return -ENOLINK;
1241
1242 mutex_lock(&local->mtx);
1243 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1244 mutex_unlock(&local->mtx);
1245
1246 master = container_of(sdata->bss,
1247 struct ieee80211_sub_if_data, u.ap);
1248 sdata->control_port_protocol =
1249 master->control_port_protocol;
1250 sdata->control_port_no_encrypt =
1251 master->control_port_no_encrypt;
1252 sdata->control_port_over_nl80211 =
1253 master->control_port_over_nl80211;
1254 sdata->control_port_no_preauth =
1255 master->control_port_no_preauth;
1256 sdata->vif.cab_queue = master->vif.cab_queue;
1257 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1258 sizeof(sdata->vif.hw_queue));
1259 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1260
1261 mutex_lock(&local->key_mtx);
1262 sdata->crypto_tx_tailroom_needed_cnt +=
1263 master->crypto_tx_tailroom_needed_cnt;
1264 mutex_unlock(&local->key_mtx);
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 /* we're brought up, everything changes */
1298 hw_reconf_flags = ~0;
1299 ieee80211_led_radio(local, true);
1300 ieee80211_mod_tpt_led_trig(local,
1301 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1302 }
1303
1304 /*
1305 * Copy the hopefully now-present MAC address to
1306 * this interface, if it has the special null one.
1307 */
1308 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1309 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1310 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1311
1312 if (!is_valid_ether_addr(dev->dev_addr)) {
1313 res = -EADDRNOTAVAIL;
1314 goto err_stop;
1315 }
1316 }
1317
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 res = drv_add_interface(local, sdata);
1337 if (res)
1338 goto err_stop;
1339 } else if (local->monitors == 0 && local->open_count == 0) {
1340 res = ieee80211_add_virtual_monitor(local);
1341 if (res)
1342 goto err_stop;
1343 }
1344
1345 /* must be before the call to ieee80211_configure_filter */
1346 local->monitors++;
1347 if (local->monitors == 1) {
1348 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1349 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1350 }
1351
1352 ieee80211_adjust_monitor_flags(sdata, 1);
1353 ieee80211_configure_filter(local);
1354 ieee80211_recalc_offload(local);
1355 mutex_lock(&local->mtx);
1356 ieee80211_recalc_idle(local);
1357 mutex_unlock(&local->mtx);
1358
1359 netif_carrier_on(dev);
1360 break;
1361 default:
1362 if (coming_up) {
1363 ieee80211_del_virtual_monitor(local);
1364 ieee80211_set_sdata_offload_flags(sdata);
1365
1366 res = drv_add_interface(local, sdata);
1367 if (res)
1368 goto err_stop;
1369
1370 ieee80211_set_vif_encap_ops(sdata);
1371 res = ieee80211_check_queues(sdata,
1372 ieee80211_vif_type_p2p(&sdata->vif));
1373 if (res)
1374 goto err_del_interface;
1375 }
1376
1377 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1378 local->fif_pspoll++;
1379 local->fif_probe_req++;
1380
1381 ieee80211_configure_filter(local);
1382 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1383 local->fif_probe_req++;
1384 }
1385
1386 if (sdata->vif.probe_req_reg)
1387 drv_config_iface_filter(local, sdata,
1388 FIF_PROBE_REQ,
1389 FIF_PROBE_REQ);
1390
1391 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1392 sdata->vif.type != NL80211_IFTYPE_NAN)
1393 changed |= ieee80211_reset_erp_info(sdata);
1394 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1395 changed);
1396
1397 switch (sdata->vif.type) {
1398 case NL80211_IFTYPE_STATION:
1399 case NL80211_IFTYPE_ADHOC:
1400 case NL80211_IFTYPE_AP:
1401 case NL80211_IFTYPE_MESH_POINT:
1402 case NL80211_IFTYPE_OCB:
1403 netif_carrier_off(dev);
1404 break;
1405 case NL80211_IFTYPE_P2P_DEVICE:
1406 case NL80211_IFTYPE_NAN:
1407 break;
1408 default:
1409 /* not reached */
1410 WARN_ON(1);
1411 }
1412
1413 /*
1414 * Set default queue parameters so drivers don't
1415 * need to initialise the hardware if the hardware
1416 * doesn't start up with sane defaults.
1417 * Enable QoS for anything but station interfaces.
1418 */
1419 ieee80211_set_wmm_default(&sdata->deflink, true,
1420 sdata->vif.type != NL80211_IFTYPE_STATION);
1421 }
1422
1423 switch (sdata->vif.type) {
1424 case NL80211_IFTYPE_P2P_DEVICE:
1425 rcu_assign_pointer(local->p2p_sdata, sdata);
1426 break;
1427 case NL80211_IFTYPE_MONITOR:
1428 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1429 break;
1430 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1431 break;
1432 default:
1433 break;
1434 }
1435
1436 /*
1437 * set_multicast_list will be invoked by the networking core
1438 * which will check whether any increments here were done in
1439 * error and sync them down to the hardware as filter flags.
1440 */
1441 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1442 atomic_inc(&local->iff_allmultis);
1443
1444 if (coming_up)
1445 local->open_count++;
1446
1447 if (hw_reconf_flags)
1448 ieee80211_hw_config(local, hw_reconf_flags);
1449
1450 ieee80211_recalc_ps(local);
1451
1452 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1453
1454 return 0;
1455 err_del_interface:
1456 drv_remove_interface(local, sdata);
1457 err_stop:
1458 if (!local->open_count)
1459 drv_stop(local);
1460 err_del_bss:
1461 sdata->bss = NULL;
1462 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1463 mutex_lock(&local->mtx);
1464 list_del(&sdata->u.vlan.list);
1465 mutex_unlock(&local->mtx);
1466 }
1467 /* might already be clear but that doesn't matter */
1468 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1469 return res;
1470 }
1471
ieee80211_if_free(struct net_device * dev)1472 static void ieee80211_if_free(struct net_device *dev)
1473 {
1474 free_percpu(dev->tstats);
1475 }
1476
ieee80211_if_setup(struct net_device * dev)1477 static void ieee80211_if_setup(struct net_device *dev)
1478 {
1479 ether_setup(dev);
1480 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1481 dev->priv_flags |= IFF_NO_QUEUE;
1482 dev->netdev_ops = &ieee80211_dataif_ops;
1483 dev->needs_free_netdev = true;
1484 dev->priv_destructor = ieee80211_if_free;
1485 }
1486
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1487 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1488 struct ieee80211_sub_if_data *sdata,
1489 struct sk_buff *skb)
1490 {
1491 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1492
1493 if (ieee80211_is_action(mgmt->frame_control) &&
1494 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1495 struct sta_info *sta;
1496 int len = skb->len;
1497
1498 mutex_lock(&local->sta_mtx);
1499 sta = sta_info_get_bss(sdata, mgmt->sa);
1500 if (sta) {
1501 switch (mgmt->u.action.u.addba_req.action_code) {
1502 case WLAN_ACTION_ADDBA_REQ:
1503 ieee80211_process_addba_request(local, sta,
1504 mgmt, len);
1505 break;
1506 case WLAN_ACTION_ADDBA_RESP:
1507 ieee80211_process_addba_resp(local, sta,
1508 mgmt, len);
1509 break;
1510 case WLAN_ACTION_DELBA:
1511 ieee80211_process_delba(sdata, sta,
1512 mgmt, len);
1513 break;
1514 default:
1515 WARN_ON(1);
1516 break;
1517 }
1518 }
1519 mutex_unlock(&local->sta_mtx);
1520 } else if (ieee80211_is_action(mgmt->frame_control) &&
1521 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1522 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1523 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1524 struct ieee80211_rx_status *status;
1525 enum nl80211_band band;
1526 struct sta_info *sta;
1527 u8 opmode;
1528
1529 status = IEEE80211_SKB_RXCB(skb);
1530 band = status->band;
1531 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1532
1533 mutex_lock(&local->sta_mtx);
1534 sta = sta_info_get_bss(sdata, mgmt->sa);
1535
1536 if (sta)
1537 ieee80211_vht_handle_opmode(sdata,
1538 &sta->deflink,
1539 opmode, band);
1540
1541 mutex_unlock(&local->sta_mtx);
1542 break;
1543 }
1544 case WLAN_VHT_ACTION_GROUPID_MGMT:
1545 ieee80211_process_mu_groups(sdata, &sdata->deflink,
1546 mgmt);
1547 break;
1548 default:
1549 WARN_ON(1);
1550 break;
1551 }
1552 } else if (ieee80211_is_action(mgmt->frame_control) &&
1553 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1554 switch (mgmt->u.action.u.s1g.action_code) {
1555 case WLAN_S1G_TWT_TEARDOWN:
1556 case WLAN_S1G_TWT_SETUP:
1557 ieee80211_s1g_rx_twt_action(sdata, skb);
1558 break;
1559 default:
1560 break;
1561 }
1562 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1563 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1564 ieee80211_sta_rx_queued_ext(sdata, skb);
1565 else
1566 WARN_ON(1);
1567 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1568 struct ieee80211_hdr *hdr = (void *)mgmt;
1569 struct sta_info *sta;
1570
1571 /*
1572 * So the frame isn't mgmt, but frame_control
1573 * is at the right place anyway, of course, so
1574 * the if statement is correct.
1575 *
1576 * Warn if we have other data frame types here,
1577 * they must not get here.
1578 */
1579 WARN_ON(hdr->frame_control &
1580 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1581 WARN_ON(!(hdr->seq_ctrl &
1582 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1583 /*
1584 * This was a fragment of a frame, received while
1585 * a block-ack session was active. That cannot be
1586 * right, so terminate the session.
1587 */
1588 mutex_lock(&local->sta_mtx);
1589 sta = sta_info_get_bss(sdata, mgmt->sa);
1590 if (sta) {
1591 u16 tid = ieee80211_get_tid(hdr);
1592
1593 __ieee80211_stop_rx_ba_session(
1594 sta, tid, WLAN_BACK_RECIPIENT,
1595 WLAN_REASON_QSTA_REQUIRE_SETUP,
1596 true);
1597 }
1598 mutex_unlock(&local->sta_mtx);
1599 } else switch (sdata->vif.type) {
1600 case NL80211_IFTYPE_STATION:
1601 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1602 break;
1603 case NL80211_IFTYPE_ADHOC:
1604 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1605 break;
1606 case NL80211_IFTYPE_MESH_POINT:
1607 if (!ieee80211_vif_is_mesh(&sdata->vif))
1608 break;
1609 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1610 break;
1611 default:
1612 WARN(1, "frame for unexpected interface type");
1613 break;
1614 }
1615 }
1616
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1617 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1618 struct sk_buff *skb)
1619 {
1620 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1621
1622 if (ieee80211_is_action(mgmt->frame_control) &&
1623 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1624 switch (mgmt->u.action.u.s1g.action_code) {
1625 case WLAN_S1G_TWT_TEARDOWN:
1626 case WLAN_S1G_TWT_SETUP:
1627 ieee80211_s1g_status_twt_action(sdata, skb);
1628 break;
1629 default:
1630 break;
1631 }
1632 }
1633 }
1634
ieee80211_iface_work(struct wiphy * wiphy,struct wiphy_work * work)1635 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1636 {
1637 struct ieee80211_sub_if_data *sdata =
1638 container_of(work, struct ieee80211_sub_if_data, work);
1639 struct ieee80211_local *local = sdata->local;
1640 struct sk_buff *skb;
1641
1642 if (!ieee80211_sdata_running(sdata))
1643 return;
1644
1645 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1646 return;
1647
1648 if (!ieee80211_can_run_worker(local))
1649 return;
1650
1651 /* first process frames */
1652 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1653 kcov_remote_start_common(skb_get_kcov_handle(skb));
1654
1655 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1656 ieee80211_process_tdls_channel_switch(sdata, skb);
1657 else
1658 ieee80211_iface_process_skb(local, sdata, skb);
1659
1660 kfree_skb(skb);
1661 kcov_remote_stop();
1662 }
1663
1664 /* process status queue */
1665 while ((skb = skb_dequeue(&sdata->status_queue))) {
1666 kcov_remote_start_common(skb_get_kcov_handle(skb));
1667
1668 ieee80211_iface_process_status(sdata, skb);
1669 kfree_skb(skb);
1670
1671 kcov_remote_stop();
1672 }
1673
1674 /* then other type-dependent work */
1675 switch (sdata->vif.type) {
1676 case NL80211_IFTYPE_STATION:
1677 ieee80211_sta_work(sdata);
1678 break;
1679 case NL80211_IFTYPE_ADHOC:
1680 ieee80211_ibss_work(sdata);
1681 break;
1682 case NL80211_IFTYPE_MESH_POINT:
1683 if (!ieee80211_vif_is_mesh(&sdata->vif))
1684 break;
1685 ieee80211_mesh_work(sdata);
1686 break;
1687 case NL80211_IFTYPE_OCB:
1688 ieee80211_ocb_work(sdata);
1689 break;
1690 default:
1691 break;
1692 }
1693 }
1694
ieee80211_recalc_smps_work(struct work_struct * work)1695 static void ieee80211_recalc_smps_work(struct work_struct *work)
1696 {
1697 struct ieee80211_sub_if_data *sdata =
1698 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1699
1700 ieee80211_recalc_smps(sdata, &sdata->deflink);
1701 }
1702
ieee80211_activate_links_work(struct work_struct * work)1703 static void ieee80211_activate_links_work(struct work_struct *work)
1704 {
1705 struct ieee80211_sub_if_data *sdata =
1706 container_of(work, struct ieee80211_sub_if_data,
1707 activate_links_work);
1708
1709 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1710 }
1711
1712 /*
1713 * Helper function to initialise an interface to a specific type.
1714 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1715 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1716 enum nl80211_iftype type)
1717 {
1718 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1719 0xff, 0xff, 0xff};
1720
1721 /* clear type-dependent unions */
1722 memset(&sdata->u, 0, sizeof(sdata->u));
1723 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1724
1725 /* and set some type-dependent values */
1726 sdata->vif.type = type;
1727 sdata->vif.p2p = false;
1728 sdata->wdev.iftype = type;
1729
1730 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1731 sdata->control_port_no_encrypt = false;
1732 sdata->control_port_over_nl80211 = false;
1733 sdata->control_port_no_preauth = false;
1734 sdata->vif.cfg.idle = true;
1735 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1736
1737 sdata->noack_map = 0;
1738
1739 /* only monitor/p2p-device differ */
1740 if (sdata->dev) {
1741 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1742 sdata->dev->type = ARPHRD_ETHER;
1743 }
1744
1745 skb_queue_head_init(&sdata->skb_queue);
1746 skb_queue_head_init(&sdata->status_queue);
1747 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1748 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1749 INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1750
1751 switch (type) {
1752 case NL80211_IFTYPE_P2P_GO:
1753 type = NL80211_IFTYPE_AP;
1754 sdata->vif.type = type;
1755 sdata->vif.p2p = true;
1756 fallthrough;
1757 case NL80211_IFTYPE_AP:
1758 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1759 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1760 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1761 break;
1762 case NL80211_IFTYPE_P2P_CLIENT:
1763 type = NL80211_IFTYPE_STATION;
1764 sdata->vif.type = type;
1765 sdata->vif.p2p = true;
1766 fallthrough;
1767 case NL80211_IFTYPE_STATION:
1768 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1769 ieee80211_sta_setup_sdata(sdata);
1770 break;
1771 case NL80211_IFTYPE_OCB:
1772 sdata->vif.bss_conf.bssid = bssid_wildcard;
1773 ieee80211_ocb_setup_sdata(sdata);
1774 break;
1775 case NL80211_IFTYPE_ADHOC:
1776 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1777 ieee80211_ibss_setup_sdata(sdata);
1778 break;
1779 case NL80211_IFTYPE_MESH_POINT:
1780 if (ieee80211_vif_is_mesh(&sdata->vif))
1781 ieee80211_mesh_init_sdata(sdata);
1782 break;
1783 case NL80211_IFTYPE_MONITOR:
1784 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1785 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1786 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1787 MONITOR_FLAG_OTHER_BSS;
1788 break;
1789 case NL80211_IFTYPE_NAN:
1790 idr_init(&sdata->u.nan.function_inst_ids);
1791 spin_lock_init(&sdata->u.nan.func_lock);
1792 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1793 break;
1794 case NL80211_IFTYPE_AP_VLAN:
1795 case NL80211_IFTYPE_P2P_DEVICE:
1796 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1797 break;
1798 case NL80211_IFTYPE_UNSPECIFIED:
1799 case NL80211_IFTYPE_WDS:
1800 case NUM_NL80211_IFTYPES:
1801 WARN_ON(1);
1802 break;
1803 }
1804
1805 /* need to do this after the switch so vif.type is correct */
1806 ieee80211_link_setup(&sdata->deflink);
1807
1808 ieee80211_debugfs_add_netdev(sdata);
1809 }
1810
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1811 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1812 enum nl80211_iftype type)
1813 {
1814 struct ieee80211_local *local = sdata->local;
1815 int ret, err;
1816 enum nl80211_iftype internal_type = type;
1817 bool p2p = false;
1818
1819 ASSERT_RTNL();
1820
1821 if (!local->ops->change_interface)
1822 return -EBUSY;
1823
1824 /* for now, don't support changing while links exist */
1825 if (ieee80211_vif_is_mld(&sdata->vif))
1826 return -EBUSY;
1827
1828 switch (sdata->vif.type) {
1829 case NL80211_IFTYPE_AP:
1830 if (!list_empty(&sdata->u.ap.vlans))
1831 return -EBUSY;
1832 break;
1833 case NL80211_IFTYPE_STATION:
1834 case NL80211_IFTYPE_ADHOC:
1835 case NL80211_IFTYPE_OCB:
1836 /*
1837 * Could maybe also all others here?
1838 * Just not sure how that interacts
1839 * with the RX/config path e.g. for
1840 * mesh.
1841 */
1842 break;
1843 default:
1844 return -EBUSY;
1845 }
1846
1847 switch (type) {
1848 case NL80211_IFTYPE_AP:
1849 case NL80211_IFTYPE_STATION:
1850 case NL80211_IFTYPE_ADHOC:
1851 case NL80211_IFTYPE_OCB:
1852 /*
1853 * Could probably support everything
1854 * but here.
1855 */
1856 break;
1857 case NL80211_IFTYPE_P2P_CLIENT:
1858 p2p = true;
1859 internal_type = NL80211_IFTYPE_STATION;
1860 break;
1861 case NL80211_IFTYPE_P2P_GO:
1862 p2p = true;
1863 internal_type = NL80211_IFTYPE_AP;
1864 break;
1865 default:
1866 return -EBUSY;
1867 }
1868
1869 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1870 if (ret)
1871 return ret;
1872
1873 ieee80211_stop_vif_queues(local, sdata,
1874 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1875 /* do_stop will synchronize_rcu() first thing */
1876 ieee80211_do_stop(sdata, false);
1877
1878 ieee80211_teardown_sdata(sdata);
1879
1880 ieee80211_set_sdata_offload_flags(sdata);
1881 ret = drv_change_interface(local, sdata, internal_type, p2p);
1882 if (ret)
1883 type = ieee80211_vif_type_p2p(&sdata->vif);
1884
1885 /*
1886 * Ignore return value here, there's not much we can do since
1887 * the driver changed the interface type internally already.
1888 * The warnings will hopefully make driver authors fix it :-)
1889 */
1890 ieee80211_check_queues(sdata, type);
1891
1892 ieee80211_setup_sdata(sdata, type);
1893 ieee80211_set_vif_encap_ops(sdata);
1894
1895 err = ieee80211_do_open(&sdata->wdev, false);
1896 WARN(err, "type change: do_open returned %d", err);
1897
1898 ieee80211_wake_vif_queues(local, sdata,
1899 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1900 return ret;
1901 }
1902
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1903 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1904 enum nl80211_iftype type)
1905 {
1906 int ret;
1907
1908 ASSERT_RTNL();
1909
1910 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1911 return 0;
1912
1913 if (ieee80211_sdata_running(sdata)) {
1914 ret = ieee80211_runtime_change_iftype(sdata, type);
1915 if (ret)
1916 return ret;
1917 } else {
1918 /* Purge and reset type-dependent state. */
1919 ieee80211_teardown_sdata(sdata);
1920 ieee80211_setup_sdata(sdata, type);
1921 }
1922
1923 /* reset some values that shouldn't be kept across type changes */
1924 if (type == NL80211_IFTYPE_STATION)
1925 sdata->u.mgd.use_4addr = false;
1926
1927 return 0;
1928 }
1929
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1930 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1931 u8 *perm_addr, enum nl80211_iftype type)
1932 {
1933 struct ieee80211_sub_if_data *sdata;
1934 u64 mask, start, addr, val, inc;
1935 u8 *m;
1936 u8 tmp_addr[ETH_ALEN];
1937 int i;
1938
1939 /* default ... something at least */
1940 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1941
1942 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1943 local->hw.wiphy->n_addresses <= 1)
1944 return;
1945
1946 mutex_lock(&local->iflist_mtx);
1947
1948 switch (type) {
1949 case NL80211_IFTYPE_MONITOR:
1950 /* doesn't matter */
1951 break;
1952 case NL80211_IFTYPE_AP_VLAN:
1953 /* match up with an AP interface */
1954 list_for_each_entry(sdata, &local->interfaces, list) {
1955 if (sdata->vif.type != NL80211_IFTYPE_AP)
1956 continue;
1957 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1958 break;
1959 }
1960 /* keep default if no AP interface present */
1961 break;
1962 case NL80211_IFTYPE_P2P_CLIENT:
1963 case NL80211_IFTYPE_P2P_GO:
1964 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1965 list_for_each_entry(sdata, &local->interfaces, list) {
1966 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1967 continue;
1968 if (!ieee80211_sdata_running(sdata))
1969 continue;
1970 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1971 goto out_unlock;
1972 }
1973 }
1974 fallthrough;
1975 default:
1976 /* assign a new address if possible -- try n_addresses first */
1977 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1978 bool used = false;
1979
1980 list_for_each_entry(sdata, &local->interfaces, list) {
1981 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1982 sdata->vif.addr)) {
1983 used = true;
1984 break;
1985 }
1986 }
1987
1988 if (!used) {
1989 memcpy(perm_addr,
1990 local->hw.wiphy->addresses[i].addr,
1991 ETH_ALEN);
1992 break;
1993 }
1994 }
1995
1996 /* try mask if available */
1997 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1998 break;
1999
2000 m = local->hw.wiphy->addr_mask;
2001 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2002 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2003 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2004
2005 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2006 /* not a contiguous mask ... not handled now! */
2007 pr_info("not contiguous\n");
2008 break;
2009 }
2010
2011 /*
2012 * Pick address of existing interface in case user changed
2013 * MAC address manually, default to perm_addr.
2014 */
2015 m = local->hw.wiphy->perm_addr;
2016 list_for_each_entry(sdata, &local->interfaces, list) {
2017 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2018 continue;
2019 m = sdata->vif.addr;
2020 break;
2021 }
2022 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2023 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2024 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2025
2026 inc = 1ULL<<__ffs64(mask);
2027 val = (start & mask);
2028 addr = (start & ~mask) | (val & mask);
2029 do {
2030 bool used = false;
2031
2032 tmp_addr[5] = addr >> 0*8;
2033 tmp_addr[4] = addr >> 1*8;
2034 tmp_addr[3] = addr >> 2*8;
2035 tmp_addr[2] = addr >> 3*8;
2036 tmp_addr[1] = addr >> 4*8;
2037 tmp_addr[0] = addr >> 5*8;
2038
2039 val += inc;
2040
2041 list_for_each_entry(sdata, &local->interfaces, list) {
2042 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2043 used = true;
2044 break;
2045 }
2046 }
2047
2048 if (!used) {
2049 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2050 break;
2051 }
2052 addr = (start & ~mask) | (val & mask);
2053 } while (addr != start);
2054
2055 break;
2056 }
2057
2058 out_unlock:
2059 mutex_unlock(&local->iflist_mtx);
2060 }
2061
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)2062 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2063 unsigned char name_assign_type,
2064 struct wireless_dev **new_wdev, enum nl80211_iftype type,
2065 struct vif_params *params)
2066 {
2067 struct net_device *ndev = NULL;
2068 struct ieee80211_sub_if_data *sdata = NULL;
2069 struct txq_info *txqi;
2070 int ret, i;
2071
2072 ASSERT_RTNL();
2073
2074 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2075 struct wireless_dev *wdev;
2076
2077 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2078 GFP_KERNEL);
2079 if (!sdata)
2080 return -ENOMEM;
2081 wdev = &sdata->wdev;
2082
2083 sdata->dev = NULL;
2084 strscpy(sdata->name, name, IFNAMSIZ);
2085 ieee80211_assign_perm_addr(local, wdev->address, type);
2086 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2087 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2088 } else {
2089 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2090 sizeof(void *));
2091 int txq_size = 0;
2092
2093 if (type != NL80211_IFTYPE_AP_VLAN &&
2094 (type != NL80211_IFTYPE_MONITOR ||
2095 (params->flags & MONITOR_FLAG_ACTIVE)))
2096 txq_size += sizeof(struct txq_info) +
2097 local->hw.txq_data_size;
2098
2099 ndev = alloc_netdev_mqs(size + txq_size,
2100 name, name_assign_type,
2101 ieee80211_if_setup, 1, 1);
2102 if (!ndev)
2103 return -ENOMEM;
2104
2105 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2106
2107 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2108 if (!ndev->tstats) {
2109 free_netdev(ndev);
2110 return -ENOMEM;
2111 }
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 ieee80211_if_free(ndev);
2125 free_netdev(ndev);
2126 return ret;
2127 }
2128
2129 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2130 if (is_valid_ether_addr(params->macaddr))
2131 eth_hw_addr_set(ndev, params->macaddr);
2132 else
2133 eth_hw_addr_set(ndev, ndev->perm_addr);
2134 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2135
2136 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2137 sdata = netdev_priv(ndev);
2138 ndev->ieee80211_ptr = &sdata->wdev;
2139 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2140 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2141 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2142
2143 if (txq_size) {
2144 txqi = netdev_priv(ndev) + size;
2145 ieee80211_txq_init(sdata, NULL, txqi, 0);
2146 }
2147
2148 sdata->dev = ndev;
2149 }
2150
2151 /* initialise type-independent data */
2152 sdata->wdev.wiphy = local->hw.wiphy;
2153
2154 ieee80211_sdata_init(local, sdata);
2155
2156 ieee80211_init_frag_cache(&sdata->frags);
2157
2158 INIT_LIST_HEAD(&sdata->key_list);
2159
2160 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2161 ieee80211_delayed_tailroom_dec);
2162
2163 for (i = 0; i < NUM_NL80211_BANDS; i++) {
2164 struct ieee80211_supported_band *sband;
2165 sband = local->hw.wiphy->bands[i];
2166 sdata->rc_rateidx_mask[i] =
2167 sband ? (1 << sband->n_bitrates) - 1 : 0;
2168 if (sband) {
2169 __le16 cap;
2170 u16 *vht_rate_mask;
2171
2172 memcpy(sdata->rc_rateidx_mcs_mask[i],
2173 sband->ht_cap.mcs.rx_mask,
2174 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2175
2176 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2177 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2178 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2179 } else {
2180 memset(sdata->rc_rateidx_mcs_mask[i], 0,
2181 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2182 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2183 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2184 }
2185 }
2186
2187 ieee80211_set_default_queues(sdata);
2188
2189 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2190 sdata->deflink.user_power_level = local->user_power_level;
2191
2192 /* setup type-dependent data */
2193 ieee80211_setup_sdata(sdata, type);
2194
2195 if (ndev) {
2196 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2197 if (type == NL80211_IFTYPE_STATION)
2198 sdata->u.mgd.use_4addr = params->use_4addr;
2199
2200 ndev->features |= local->hw.netdev_features;
2201 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2202 ndev->hw_features |= ndev->features &
2203 MAC80211_SUPPORTED_FEATURES_TX;
2204 sdata->vif.netdev_features = local->hw.netdev_features;
2205
2206 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2207
2208 /* MTU range is normally 256 - 2304, where the upper limit is
2209 * the maximum MSDU size. Monitor interfaces send and receive
2210 * MPDU and A-MSDU frames which may be much larger so we do
2211 * not impose an upper limit in that case.
2212 */
2213 ndev->min_mtu = 256;
2214 if (type == NL80211_IFTYPE_MONITOR)
2215 ndev->max_mtu = 0;
2216 else
2217 ndev->max_mtu = local->hw.max_mtu;
2218
2219 ret = cfg80211_register_netdevice(ndev);
2220 if (ret) {
2221 free_netdev(ndev);
2222 return ret;
2223 }
2224 }
2225
2226 mutex_lock(&local->iflist_mtx);
2227 list_add_tail_rcu(&sdata->list, &local->interfaces);
2228 mutex_unlock(&local->iflist_mtx);
2229
2230 if (new_wdev)
2231 *new_wdev = &sdata->wdev;
2232
2233 return 0;
2234 }
2235
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2236 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2237 {
2238 ASSERT_RTNL();
2239
2240 mutex_lock(&sdata->local->iflist_mtx);
2241 list_del_rcu(&sdata->list);
2242 mutex_unlock(&sdata->local->iflist_mtx);
2243
2244 if (sdata->vif.txq)
2245 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2246
2247 synchronize_rcu();
2248
2249 cfg80211_unregister_wdev(&sdata->wdev);
2250
2251 if (!sdata->dev) {
2252 ieee80211_teardown_sdata(sdata);
2253 kfree(sdata);
2254 }
2255 }
2256
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2257 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2258 {
2259 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2260 return;
2261 ieee80211_do_stop(sdata, true);
2262 }
2263
ieee80211_remove_interfaces(struct ieee80211_local * local)2264 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2265 {
2266 struct ieee80211_sub_if_data *sdata, *tmp;
2267 LIST_HEAD(unreg_list);
2268
2269 ASSERT_RTNL();
2270
2271 /* Before destroying the interfaces, make sure they're all stopped so
2272 * that the hardware is stopped. Otherwise, the driver might still be
2273 * iterating the interfaces during the shutdown, e.g. from a worker
2274 * or from RX processing or similar, and if it does so (using atomic
2275 * iteration) while we're manipulating the list, the iteration will
2276 * crash.
2277 *
2278 * After this, the hardware should be stopped and the driver should
2279 * have stopped all of its activities, so that we can do RCU-unaware
2280 * manipulations of the interface list below.
2281 */
2282 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2283
2284 WARN(local->open_count, "%s: open count remains %d\n",
2285 wiphy_name(local->hw.wiphy), local->open_count);
2286
2287 ieee80211_txq_teardown_flows(local);
2288
2289 mutex_lock(&local->iflist_mtx);
2290 list_splice_init(&local->interfaces, &unreg_list);
2291 mutex_unlock(&local->iflist_mtx);
2292
2293 wiphy_lock(local->hw.wiphy);
2294 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2295 bool netdev = sdata->dev;
2296
2297 list_del(&sdata->list);
2298 cfg80211_unregister_wdev(&sdata->wdev);
2299
2300 if (!netdev)
2301 kfree(sdata);
2302 }
2303 wiphy_unlock(local->hw.wiphy);
2304 }
2305
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2306 static int netdev_notify(struct notifier_block *nb,
2307 unsigned long state, void *ptr)
2308 {
2309 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2310 struct ieee80211_sub_if_data *sdata;
2311
2312 if (state != NETDEV_CHANGENAME)
2313 return NOTIFY_DONE;
2314
2315 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2316 return NOTIFY_DONE;
2317
2318 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2319 return NOTIFY_DONE;
2320
2321 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2322 memcpy(sdata->name, dev->name, IFNAMSIZ);
2323 ieee80211_debugfs_rename_netdev(sdata);
2324
2325 return NOTIFY_OK;
2326 }
2327
2328 static struct notifier_block mac80211_netdev_notifier = {
2329 .notifier_call = netdev_notify,
2330 };
2331
ieee80211_iface_init(void)2332 int ieee80211_iface_init(void)
2333 {
2334 return register_netdevice_notifier(&mac80211_netdev_notifier);
2335 }
2336
ieee80211_iface_exit(void)2337 void ieee80211_iface_exit(void)
2338 {
2339 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2340 }
2341
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2342 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2343 {
2344 if (sdata->vif.type == NL80211_IFTYPE_AP)
2345 atomic_inc(&sdata->u.ap.num_mcast_sta);
2346 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2347 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2348 }
2349
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2350 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2351 {
2352 if (sdata->vif.type == NL80211_IFTYPE_AP)
2353 atomic_dec(&sdata->u.ap.num_mcast_sta);
2354 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2355 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2356 }
2357
