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_sub_if_data * sdata)47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
48 {
49 struct ieee80211_chanctx_conf *chanctx_conf;
50 int power;
51
52 rcu_read_lock();
53 chanctx_conf = rcu_dereference(sdata->vif.bss_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 (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
63 power = min(power, sdata->deflink.user_power_level);
64
65 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
66 power = min(power, sdata->deflink.ap_power_level);
67
68 if (power != sdata->vif.bss_conf.txpower) {
69 sdata->vif.bss_conf.txpower = power;
70 ieee80211_hw_config(sdata->local, 0);
71 return true;
72 }
73
74 return false;
75 }
76
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
78 bool update_bss)
79 {
80 if (__ieee80211_recalc_txpower(sdata) ||
81 (update_bss && ieee80211_sdata_running(sdata)))
82 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
83 BSS_CHANGED_TXPOWER);
84 }
85
__ieee80211_idle_off(struct ieee80211_local * local)86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
87 {
88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
89 return 0;
90
91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
92 return IEEE80211_CONF_CHANGE_IDLE;
93 }
94
__ieee80211_idle_on(struct ieee80211_local * local)95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
96 {
97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
98 return 0;
99
100 ieee80211_flush_queues(local, NULL, false);
101
102 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103 return IEEE80211_CONF_CHANGE_IDLE;
104 }
105
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107 bool force_active)
108 {
109 bool working, scanning, active;
110 unsigned int led_trig_start = 0, led_trig_stop = 0;
111
112 lockdep_assert_wiphy(local->hw.wiphy);
113
114 active = force_active ||
115 !list_empty(&local->chanctx_list) ||
116 local->monitors;
117
118 working = !local->ops->remain_on_channel &&
119 !list_empty(&local->roc_list);
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
ieee80211_idle_off(struct ieee80211_local * local)141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
ieee80211_recalc_idle(struct ieee80211_local * local)146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
154 bool check_dup)
155 {
156 struct ieee80211_local *local = sdata->local;
157 struct ieee80211_sub_if_data *iter;
158 u64 new, mask, tmp;
159 u8 *m;
160 int ret = 0;
161
162 lockdep_assert_wiphy(local->hw.wiphy);
163
164 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
165 return 0;
166
167 m = addr;
168 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
169 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
170 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
171
172 m = local->hw.wiphy->addr_mask;
173 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176
177 if (!check_dup)
178 return ret;
179
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
199 return ret;
200 }
201
ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)202 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
203 {
204 struct ieee80211_roc_work *roc;
205 struct ieee80211_local *local = sdata->local;
206 struct ieee80211_sub_if_data *scan_sdata;
207 int ret = 0;
208
209 lockdep_assert_wiphy(local->hw.wiphy);
210
211 /* To be the most flexible here we want to only limit changing the
212 * address if the specific interface is doing offchannel work or
213 * scanning.
214 */
215 if (netif_carrier_ok(sdata->dev))
216 return -EBUSY;
217
218 /* First check no ROC work is happening on this iface */
219 list_for_each_entry(roc, &local->roc_list, list) {
220 if (roc->sdata != sdata)
221 continue;
222
223 if (roc->started) {
224 ret = -EBUSY;
225 goto unlock;
226 }
227 }
228
229 /* And if this iface is scanning */
230 if (local->scanning) {
231 scan_sdata = rcu_dereference_protected(local->scan_sdata,
232 lockdep_is_held(&local->hw.wiphy->mtx));
233 if (sdata == scan_sdata)
234 ret = -EBUSY;
235 }
236
237 switch (sdata->vif.type) {
238 case NL80211_IFTYPE_STATION:
239 case NL80211_IFTYPE_P2P_CLIENT:
240 /* More interface types could be added here but changing the
241 * address while powered makes the most sense in client modes.
242 */
243 break;
244 default:
245 ret = -EOPNOTSUPP;
246 }
247
248 unlock:
249 return ret;
250 }
251
_ieee80211_change_mac(struct ieee80211_sub_if_data * sdata,void * addr)252 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
253 void *addr)
254 {
255 struct ieee80211_local *local = sdata->local;
256 struct sockaddr *sa = addr;
257 bool check_dup = true;
258 bool live = false;
259 int ret;
260
261 if (ieee80211_sdata_running(sdata)) {
262 ret = ieee80211_can_powered_addr_change(sdata);
263 if (ret)
264 return ret;
265
266 live = true;
267 }
268
269 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
270 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
271 check_dup = false;
272
273 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
274 if (ret)
275 return ret;
276
277 if (live)
278 drv_remove_interface(local, sdata);
279 ret = eth_mac_addr(sdata->dev, sa);
280
281 if (ret == 0) {
282 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
283 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
284 }
285
286 /* Regardless of eth_mac_addr() return we still want to add the
287 * interface back. This should not fail...
288 */
289 if (live)
290 WARN_ON(drv_add_interface(local, sdata));
291
292 return ret;
293 }
294
ieee80211_change_mac(struct net_device * dev,void * addr)295 static int ieee80211_change_mac(struct net_device *dev, void *addr)
296 {
297 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
298 struct ieee80211_local *local = sdata->local;
299 int ret;
300
301 /*
302 * This happens during unregistration if there's a bond device
303 * active (maybe other cases?) and we must get removed from it.
304 * But we really don't care anymore if it's not registered now.
305 */
306 if (!dev->ieee80211_ptr->registered)
307 return 0;
308
309 wiphy_lock(local->hw.wiphy);
310 ret = _ieee80211_change_mac(sdata, addr);
311 wiphy_unlock(local->hw.wiphy);
312
313 return ret;
314 }
315
identical_mac_addr_allowed(int type1,int type2)316 static inline int identical_mac_addr_allowed(int type1, int type2)
317 {
318 return type1 == NL80211_IFTYPE_MONITOR ||
319 type2 == NL80211_IFTYPE_MONITOR ||
320 type1 == NL80211_IFTYPE_P2P_DEVICE ||
321 type2 == NL80211_IFTYPE_P2P_DEVICE ||
322 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
323 (type1 == NL80211_IFTYPE_AP_VLAN &&
324 (type2 == NL80211_IFTYPE_AP ||
325 type2 == NL80211_IFTYPE_AP_VLAN));
326 }
327
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)328 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
329 enum nl80211_iftype iftype)
330 {
331 struct ieee80211_local *local = sdata->local;
332 struct ieee80211_sub_if_data *nsdata;
333
334 ASSERT_RTNL();
335 lockdep_assert_wiphy(local->hw.wiphy);
336
337 /* we hold the RTNL here so can safely walk the list */
338 list_for_each_entry(nsdata, &local->interfaces, list) {
339 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
340 /*
341 * Only OCB and monitor mode may coexist
342 */
343 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
344 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
345 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
346 nsdata->vif.type == NL80211_IFTYPE_OCB))
347 return -EBUSY;
348
349 /*
350 * Allow only a single IBSS interface to be up at any
351 * time. This is restricted because beacon distribution
352 * cannot work properly if both are in the same IBSS.
353 *
354 * To remove this restriction we'd have to disallow them
355 * from setting the same SSID on different IBSS interfaces
356 * belonging to the same hardware. Then, however, we're
357 * faced with having to adopt two different TSF timers...
358 */
359 if (iftype == NL80211_IFTYPE_ADHOC &&
360 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
361 return -EBUSY;
362 /*
363 * will not add another interface while any channel
364 * switch is active.
365 */
366 if (nsdata->vif.bss_conf.csa_active)
367 return -EBUSY;
368
369 /*
370 * The remaining checks are only performed for interfaces
371 * with the same MAC address.
372 */
373 if (!ether_addr_equal(sdata->vif.addr,
374 nsdata->vif.addr))
375 continue;
376
377 /*
378 * check whether it may have the same address
379 */
380 if (!identical_mac_addr_allowed(iftype,
381 nsdata->vif.type))
382 return -ENOTUNIQ;
383
384 /* No support for VLAN with MLO yet */
385 if (iftype == NL80211_IFTYPE_AP_VLAN &&
386 sdata->wdev.use_4addr &&
387 nsdata->vif.type == NL80211_IFTYPE_AP &&
388 nsdata->vif.valid_links)
389 return -EOPNOTSUPP;
390
391 /*
392 * can only add VLANs to enabled APs
393 */
394 if (iftype == NL80211_IFTYPE_AP_VLAN &&
395 nsdata->vif.type == NL80211_IFTYPE_AP)
396 sdata->bss = &nsdata->u.ap;
397 }
398 }
399
400 return ieee80211_check_combinations(sdata, NULL, 0, 0, -1);
401 }
402
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)403 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
404 enum nl80211_iftype iftype)
405 {
406 int n_queues = sdata->local->hw.queues;
407 int i;
408
409 if (iftype == NL80211_IFTYPE_NAN)
410 return 0;
411
412 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
413 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
414 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
415 IEEE80211_INVAL_HW_QUEUE))
416 return -EINVAL;
417 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
418 n_queues))
419 return -EINVAL;
420 }
421 }
422
423 if ((iftype != NL80211_IFTYPE_AP &&
424 iftype != NL80211_IFTYPE_P2P_GO &&
425 iftype != NL80211_IFTYPE_MESH_POINT) ||
426 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
427 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
428 return 0;
429 }
430
431 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
432 return -EINVAL;
433
434 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
435 return -EINVAL;
436
437 return 0;
438 }
439
ieee80211_open(struct net_device * dev)440 static int ieee80211_open(struct net_device *dev)
441 {
442 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
443 int err;
444
445 /* fail early if user set an invalid address */
446 if (!is_valid_ether_addr(dev->dev_addr))
447 return -EADDRNOTAVAIL;
448
449 wiphy_lock(sdata->local->hw.wiphy);
450 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
451 if (err)
452 goto out;
453
454 err = ieee80211_do_open(&sdata->wdev, true);
455 out:
456 wiphy_unlock(sdata->local->hw.wiphy);
457
458 return err;
459 }
460
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)461 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
462 {
463 struct ieee80211_local *local = sdata->local;
464 unsigned long flags;
465 struct sk_buff *skb, *tmp;
466 u32 hw_reconf_flags = 0;
467 int i, flushed;
468 struct ps_data *ps;
469 struct cfg80211_chan_def chandef;
470 bool cancel_scan;
471 struct cfg80211_nan_func *func;
472
473 lockdep_assert_wiphy(local->hw.wiphy);
474
475 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
476 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
477
478 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
479 if (cancel_scan)
480 ieee80211_scan_cancel(local);
481
482 ieee80211_roc_purge(local, sdata);
483
484 switch (sdata->vif.type) {
485 case NL80211_IFTYPE_STATION:
486 ieee80211_mgd_stop(sdata);
487 break;
488 case NL80211_IFTYPE_ADHOC:
489 ieee80211_ibss_stop(sdata);
490 break;
491 case NL80211_IFTYPE_MONITOR:
492 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
493 break;
494 list_del_rcu(&sdata->u.mntr.list);
495 break;
496 default:
497 break;
498 }
499
500 /*
501 * Remove all stations associated with this interface.
502 *
503 * This must be done before calling ops->remove_interface()
504 * because otherwise we can later invoke ops->sta_notify()
505 * whenever the STAs are removed, and that invalidates driver
506 * assumptions about always getting a vif pointer that is valid
507 * (because if we remove a STA after ops->remove_interface()
508 * the driver will have removed the vif info already!)
509 *
510 * For AP_VLANs stations may exist since there's nothing else that
511 * would have removed them, but in other modes there shouldn't
512 * be any stations.
513 */
514 flushed = sta_info_flush(sdata, -1);
515 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
516
517 /* don't count this interface for allmulti while it is down */
518 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
519 atomic_dec(&local->iff_allmultis);
520
521 if (sdata->vif.type == NL80211_IFTYPE_AP) {
522 local->fif_pspoll--;
523 local->fif_probe_req--;
524 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
525 local->fif_probe_req--;
526 }
527
528 if (sdata->dev) {
529 netif_addr_lock_bh(sdata->dev);
530 spin_lock_bh(&local->filter_lock);
531 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
532 sdata->dev->addr_len);
533 spin_unlock_bh(&local->filter_lock);
534 netif_addr_unlock_bh(sdata->dev);
535 }
536
537 del_timer_sync(&local->dynamic_ps_timer);
538 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work);
539
540 WARN(ieee80211_vif_is_mld(&sdata->vif),
541 "destroying interface with valid links 0x%04x\n",
542 sdata->vif.valid_links);
543
544 sdata->vif.bss_conf.csa_active = false;
545 if (sdata->vif.type == NL80211_IFTYPE_STATION)
546 sdata->deflink.u.mgd.csa.waiting_bcn = false;
547 ieee80211_vif_unblock_queues_csa(sdata);
548
549 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work);
550 wiphy_work_cancel(local->hw.wiphy,
551 &sdata->deflink.color_change_finalize_work);
552 wiphy_delayed_work_cancel(local->hw.wiphy,
553 &sdata->dfs_cac_timer_work);
554
555 if (sdata->wdev.cac_started) {
556 chandef = sdata->vif.bss_conf.chanreq.oper;
557 WARN_ON(local->suspended);
558 ieee80211_link_release_channel(&sdata->deflink);
559 cfg80211_cac_event(sdata->dev, &chandef,
560 NL80211_RADAR_CAC_ABORTED,
561 GFP_KERNEL);
562 }
563
564 if (sdata->vif.type == NL80211_IFTYPE_AP) {
565 WARN_ON(!list_empty(&sdata->u.ap.vlans));
566 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
567 /* remove all packets in parent bc_buf pointing to this dev */
568 ps = &sdata->bss->ps;
569
570 spin_lock_irqsave(&ps->bc_buf.lock, flags);
571 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
572 if (skb->dev == sdata->dev) {
573 __skb_unlink(skb, &ps->bc_buf);
574 local->total_ps_buffered--;
575 ieee80211_free_txskb(&local->hw, skb);
576 }
577 }
578 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
579 }
580
581 if (going_down)
582 local->open_count--;
583
584 switch (sdata->vif.type) {
585 case NL80211_IFTYPE_AP_VLAN:
586 list_del(&sdata->u.vlan.list);
587 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
588 /* see comment in the default case below */
589 ieee80211_free_keys(sdata, true);
590 /* no need to tell driver */
591 break;
592 case NL80211_IFTYPE_MONITOR:
593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
594 local->cooked_mntrs--;
595 break;
596 }
597
598 local->monitors--;
599 if (local->monitors == 0) {
600 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
601 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
602 }
603
604 ieee80211_adjust_monitor_flags(sdata, -1);
605 break;
606 case NL80211_IFTYPE_NAN:
607 /* clean all the functions */
608 spin_lock_bh(&sdata->u.nan.func_lock);
609
610 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
611 idr_remove(&sdata->u.nan.function_inst_ids, i);
612 cfg80211_free_nan_func(func);
613 }
614 idr_destroy(&sdata->u.nan.function_inst_ids);
615
616 spin_unlock_bh(&sdata->u.nan.func_lock);
617 break;
618 case NL80211_IFTYPE_P2P_DEVICE:
619 /* relies on synchronize_rcu() below */
620 RCU_INIT_POINTER(local->p2p_sdata, NULL);
621 fallthrough;
622 default:
623 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
624 /*
625 * When we get here, the interface is marked down.
626 * Free the remaining keys, if there are any
627 * (which can happen in AP mode if userspace sets
628 * keys before the interface is operating)
629 *
630 * Force the key freeing to always synchronize_net()
631 * to wait for the RX path in case it is using this
632 * interface enqueuing frames at this very time on
633 * another CPU.
634 */
635 ieee80211_free_keys(sdata, true);
636 skb_queue_purge(&sdata->skb_queue);
637 skb_queue_purge(&sdata->status_queue);
638 }
639
640 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
641 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
642 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
644 if (info->control.vif == &sdata->vif) {
645 __skb_unlink(skb, &local->pending[i]);
646 ieee80211_free_txskb(&local->hw, skb);
647 }
648 }
649 }
650 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
651
652 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
653 ieee80211_txq_remove_vlan(local, sdata);
654
655 sdata->bss = NULL;
656
657 if (local->open_count == 0)
658 ieee80211_clear_tx_pending(local);
659
660 sdata->vif.bss_conf.beacon_int = 0;
661
662 /*
663 * If the interface goes down while suspended, presumably because
664 * the device was unplugged and that happens before our resume,
665 * then the driver is already unconfigured and the remainder of
666 * this function isn't needed.
667 * XXX: what about WoWLAN? If the device has software state, e.g.
668 * memory allocated, it might expect teardown commands from
669 * mac80211 here?
670 */
671 if (local->suspended) {
672 WARN_ON(local->wowlan);
673 WARN_ON(rcu_access_pointer(local->monitor_sdata));
674 return;
675 }
676
677 switch (sdata->vif.type) {
678 case NL80211_IFTYPE_AP_VLAN:
679 break;
680 case NL80211_IFTYPE_MONITOR:
681 if (local->monitors == 0)
682 ieee80211_del_virtual_monitor(local);
683
684 ieee80211_recalc_idle(local);
685 ieee80211_recalc_offload(local);
686
687 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
688 break;
689
690 fallthrough;
691 default:
692 if (!going_down)
693 break;
694 drv_remove_interface(local, sdata);
695
696 /* Clear private driver data to prevent reuse */
697 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size);
698 }
699
700 ieee80211_recalc_ps(local);
701
702 if (cancel_scan)
703 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
704
705 if (local->open_count == 0) {
706 ieee80211_stop_device(local, false);
707
708 /* no reconfiguring after stop! */
709 return;
710 }
711
712 /* do after stop to avoid reconfiguring when we stop anyway */
713 ieee80211_configure_filter(local);
714 ieee80211_hw_config(local, hw_reconf_flags);
715
716 if (local->monitors == local->open_count)
717 ieee80211_add_virtual_monitor(local);
718 }
719
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)720 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
721 {
722 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
723 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
724
725 if (!tx_vif)
726 return;
727
728 tx_sdata = vif_to_sdata(tx_vif);
729 sdata->vif.mbssid_tx_vif = NULL;
730
731 list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
732 &tx_sdata->local->interfaces, list) {
733 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
734 non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
735 ieee80211_sdata_running(non_tx_sdata)) {
736 non_tx_sdata->vif.mbssid_tx_vif = NULL;
737 dev_close(non_tx_sdata->wdev.netdev);
738 }
739 }
740
741 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
742 tx_sdata->vif.mbssid_tx_vif = NULL;
743 dev_close(tx_sdata->wdev.netdev);
744 }
745 }
746
ieee80211_stop(struct net_device * dev)747 static int ieee80211_stop(struct net_device *dev)
748 {
749 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
750
751 /* close dependent VLAN and MBSSID interfaces before locking wiphy */
752 if (sdata->vif.type == NL80211_IFTYPE_AP) {
753 struct ieee80211_sub_if_data *vlan, *tmpsdata;
754
755 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
756 u.vlan.list)
757 dev_close(vlan->dev);
758
759 ieee80211_stop_mbssid(sdata);
760 }
761
762 wiphy_lock(sdata->local->hw.wiphy);
763 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work);
764
765 ieee80211_do_stop(sdata, true);
766 wiphy_unlock(sdata->local->hw.wiphy);
767
768 return 0;
769 }
770
ieee80211_set_multicast_list(struct net_device * dev)771 static void ieee80211_set_multicast_list(struct net_device *dev)
772 {
773 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
774 struct ieee80211_local *local = sdata->local;
775 int allmulti, sdata_allmulti;
776
777 allmulti = !!(dev->flags & IFF_ALLMULTI);
778 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
779
780 if (allmulti != sdata_allmulti) {
781 if (dev->flags & IFF_ALLMULTI)
782 atomic_inc(&local->iff_allmultis);
783 else
784 atomic_dec(&local->iff_allmultis);
785 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
786 }
787
788 spin_lock_bh(&local->filter_lock);
789 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
790 spin_unlock_bh(&local->filter_lock);
791 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter);
792 }
793
794 /*
795 * Called when the netdev is removed or, by the code below, before
796 * the interface type changes.
797 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)798 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
799 {
800 /* free extra data */
801 ieee80211_free_keys(sdata, false);
802
803 ieee80211_debugfs_remove_netdev(sdata);
804
805 ieee80211_destroy_frag_cache(&sdata->frags);
806
807 if (ieee80211_vif_is_mesh(&sdata->vif))
808 ieee80211_mesh_teardown_sdata(sdata);
809
810 ieee80211_vif_clear_links(sdata);
811 ieee80211_link_stop(&sdata->deflink);
812 }
813
ieee80211_uninit(struct net_device * dev)814 static void ieee80211_uninit(struct net_device *dev)
815 {
816 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
817 }
818
ieee80211_netdev_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)819 static int ieee80211_netdev_setup_tc(struct net_device *dev,
820 enum tc_setup_type type, void *type_data)
821 {
822 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
823 struct ieee80211_local *local = sdata->local;
824
825 return drv_net_setup_tc(local, sdata, dev, type, type_data);
826 }
827
828 static const struct net_device_ops ieee80211_dataif_ops = {
829 .ndo_open = ieee80211_open,
830 .ndo_stop = ieee80211_stop,
831 .ndo_uninit = ieee80211_uninit,
832 .ndo_start_xmit = ieee80211_subif_start_xmit,
833 .ndo_set_rx_mode = ieee80211_set_multicast_list,
834 .ndo_set_mac_address = ieee80211_change_mac,
835 .ndo_setup_tc = ieee80211_netdev_setup_tc,
836 };
837
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)838 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
839 struct sk_buff *skb,
840 struct net_device *sb_dev)
841 {
842 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
843 struct ieee80211_local *local = sdata->local;
844 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
845 struct ieee80211_hdr *hdr;
846 int len_rthdr;
847
848 if (local->hw.queues < IEEE80211_NUM_ACS)
849 return 0;
850
851 /* reset flags and info before parsing radiotap header */
852 memset(info, 0, sizeof(*info));
853
854 if (!ieee80211_parse_tx_radiotap(skb, dev))
855 return 0; /* doesn't matter, frame will be dropped */
856
857 len_rthdr = ieee80211_get_radiotap_len(skb->data);
858 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
859 if (skb->len < len_rthdr + 2 ||
860 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
861 return 0; /* doesn't matter, frame will be dropped */
862
863 return ieee80211_select_queue_80211(sdata, skb, hdr);
864 }
865
866 static const struct net_device_ops ieee80211_monitorif_ops = {
867 .ndo_open = ieee80211_open,
868 .ndo_stop = ieee80211_stop,
869 .ndo_uninit = ieee80211_uninit,
870 .ndo_start_xmit = ieee80211_monitor_start_xmit,
871 .ndo_set_rx_mode = ieee80211_set_multicast_list,
872 .ndo_set_mac_address = ieee80211_change_mac,
873 .ndo_select_queue = ieee80211_monitor_select_queue,
874 };
875
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)876 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
877 struct net_device_path *path)
878 {
879 struct ieee80211_sub_if_data *sdata;
880 struct ieee80211_local *local;
881 struct sta_info *sta;
882 int ret = -ENOENT;
883
884 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
885 local = sdata->local;
886
887 if (!local->ops->net_fill_forward_path)
888 return -EOPNOTSUPP;
889
890 rcu_read_lock();
891 switch (sdata->vif.type) {
892 case NL80211_IFTYPE_AP_VLAN:
893 sta = rcu_dereference(sdata->u.vlan.sta);
894 if (sta)
895 break;
896 if (sdata->wdev.use_4addr)
897 goto out;
898 if (is_multicast_ether_addr(ctx->daddr))
899 goto out;
900 sta = sta_info_get_bss(sdata, ctx->daddr);
901 break;
902 case NL80211_IFTYPE_AP:
903 if (is_multicast_ether_addr(ctx->daddr))
904 goto out;
905 sta = sta_info_get(sdata, ctx->daddr);
906 break;
907 case NL80211_IFTYPE_STATION:
908 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
909 sta = sta_info_get(sdata, ctx->daddr);
910 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
911 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
912 goto out;
913
914 break;
915 }
916 }
917
918 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
919 break;
920 default:
921 goto out;
922 }
923
924 if (!sta)
925 goto out;
926
927 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
928 out:
929 rcu_read_unlock();
930
931 return ret;
932 }
933
934 static const struct net_device_ops ieee80211_dataif_8023_ops = {
935 .ndo_open = ieee80211_open,
936 .ndo_stop = ieee80211_stop,
937 .ndo_uninit = ieee80211_uninit,
938 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
939 .ndo_set_rx_mode = ieee80211_set_multicast_list,
940 .ndo_set_mac_address = ieee80211_change_mac,
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 lockdep_assert_wiphy(local->hw.wiphy);
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
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1059 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1060 const int offset)
1061 {
1062 struct ieee80211_local *local = sdata->local;
1063 u32 flags = sdata->u.mntr.flags;
1064
1065 #define ADJUST(_f, _s) do { \
1066 if (flags & MONITOR_FLAG_##_f) \
1067 local->fif_##_s += offset; \
1068 } while (0)
1069
1070 ADJUST(FCSFAIL, fcsfail);
1071 ADJUST(PLCPFAIL, plcpfail);
1072 ADJUST(CONTROL, control);
1073 ADJUST(CONTROL, pspoll);
1074 ADJUST(OTHER_BSS, other_bss);
1075
1076 #undef ADJUST
1077 }
1078
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1079 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1080 {
1081 struct ieee80211_local *local = sdata->local;
1082 int i;
1083
1084 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1085 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1086 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1087 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1088 sdata->vif.hw_queue[i] = i;
1089 else
1090 sdata->vif.hw_queue[i] = 0;
1091 }
1092 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1093 }
1094
ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1095 static void ieee80211_sdata_init(struct ieee80211_local *local,
1096 struct ieee80211_sub_if_data *sdata)
1097 {
1098 sdata->local = local;
1099
1100 /*
1101 * Initialize the default link, so we can use link_id 0 for non-MLD,
1102 * and that continues to work for non-MLD-aware drivers that use just
1103 * vif.bss_conf instead of vif.link_conf.
1104 *
1105 * Note that we never change this, so if link ID 0 isn't used in an
1106 * MLD connection, we get a separate allocation for it.
1107 */
1108 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1109 }
1110
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1111 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1112 {
1113 struct ieee80211_sub_if_data *sdata;
1114 int ret;
1115
1116 ASSERT_RTNL();
1117 lockdep_assert_wiphy(local->hw.wiphy);
1118
1119 if (local->monitor_sdata)
1120 return 0;
1121
1122 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1123 if (!sdata)
1124 return -ENOMEM;
1125
1126 /* set up data */
1127 sdata->vif.type = NL80211_IFTYPE_MONITOR;
1128 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1129 wiphy_name(local->hw.wiphy));
1130 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1131 sdata->wdev.wiphy = local->hw.wiphy;
1132
1133 ieee80211_sdata_init(local, sdata);
1134
1135 ieee80211_set_default_queues(sdata);
1136
1137 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1138 ret = drv_add_interface(local, sdata);
1139 if (WARN_ON(ret)) {
1140 /* ok .. stupid driver, it asked for this! */
1141 kfree(sdata);
1142 return ret;
1143 }
1144 }
1145
1146 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1147
1148 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1149 if (ret) {
1150 kfree(sdata);
1151 return ret;
1152 }
1153
1154 mutex_lock(&local->iflist_mtx);
1155 rcu_assign_pointer(local->monitor_sdata, sdata);
1156 mutex_unlock(&local->iflist_mtx);
1157
1158 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq,
1159 IEEE80211_CHANCTX_EXCLUSIVE);
1160 if (ret) {
1161 mutex_lock(&local->iflist_mtx);
1162 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1163 mutex_unlock(&local->iflist_mtx);
1164 synchronize_net();
1165 drv_remove_interface(local, sdata);
1166 kfree(sdata);
1167 return ret;
1168 }
1169
1170 skb_queue_head_init(&sdata->skb_queue);
1171 skb_queue_head_init(&sdata->status_queue);
1172 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1173
1174 return 0;
1175 }
1176
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1177 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1178 {
1179 struct ieee80211_sub_if_data *sdata;
1180
1181 ASSERT_RTNL();
1182 lockdep_assert_wiphy(local->hw.wiphy);
1183
1184 mutex_lock(&local->iflist_mtx);
1185
1186 sdata = rcu_dereference_protected(local->monitor_sdata,
1187 lockdep_is_held(&local->iflist_mtx));
1188 if (!sdata) {
1189 mutex_unlock(&local->iflist_mtx);
1190 return;
1191 }
1192
1193 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1194 mutex_unlock(&local->iflist_mtx);
1195
1196 synchronize_net();
1197
1198 ieee80211_link_release_channel(&sdata->deflink);
1199
1200 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1201 drv_remove_interface(local, sdata);
1202
1203 kfree(sdata);
1204 }
1205
1206 /*
1207 * NOTE: Be very careful when changing this function, it must NOT return
1208 * an error on interface type changes that have been pre-checked, so most
1209 * checks should be in ieee80211_check_concurrent_iface.
1210 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1211 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1212 {
1213 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1214 struct net_device *dev = wdev->netdev;
1215 struct ieee80211_local *local = sdata->local;
1216 u64 changed = 0;
1217 int res;
1218 u32 hw_reconf_flags = 0;
1219
1220 lockdep_assert_wiphy(local->hw.wiphy);
1221
1222 switch (sdata->vif.type) {
1223 case NL80211_IFTYPE_AP_VLAN: {
1224 struct ieee80211_sub_if_data *master;
1225
1226 if (!sdata->bss)
1227 return -ENOLINK;
1228
1229 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1230
1231 master = container_of(sdata->bss,
1232 struct ieee80211_sub_if_data, u.ap);
1233 sdata->control_port_protocol =
1234 master->control_port_protocol;
1235 sdata->control_port_no_encrypt =
1236 master->control_port_no_encrypt;
1237 sdata->control_port_over_nl80211 =
1238 master->control_port_over_nl80211;
1239 sdata->control_port_no_preauth =
1240 master->control_port_no_preauth;
1241 sdata->vif.cab_queue = master->vif.cab_queue;
1242 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1243 sizeof(sdata->vif.hw_queue));
1244 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq;
1245
1246 sdata->crypto_tx_tailroom_needed_cnt +=
1247 master->crypto_tx_tailroom_needed_cnt;
1248
1249 break;
1250 }
1251 case NL80211_IFTYPE_AP:
1252 sdata->bss = &sdata->u.ap;
1253 break;
1254 case NL80211_IFTYPE_MESH_POINT:
1255 case NL80211_IFTYPE_STATION:
1256 case NL80211_IFTYPE_MONITOR:
1257 case NL80211_IFTYPE_ADHOC:
1258 case NL80211_IFTYPE_P2P_DEVICE:
1259 case NL80211_IFTYPE_OCB:
1260 case NL80211_IFTYPE_NAN:
1261 /* no special treatment */
1262 break;
1263 case NL80211_IFTYPE_UNSPECIFIED:
1264 case NUM_NL80211_IFTYPES:
1265 case NL80211_IFTYPE_P2P_CLIENT:
1266 case NL80211_IFTYPE_P2P_GO:
1267 case NL80211_IFTYPE_WDS:
1268 /* cannot happen */
1269 WARN_ON(1);
1270 break;
1271 }
1272
1273 if (local->open_count == 0) {
1274 /* here we can consider everything in good order (again) */
1275 local->reconfig_failure = false;
1276
1277 res = drv_start(local);
1278 if (res)
1279 goto err_del_bss;
1280 ieee80211_led_radio(local, true);
1281 ieee80211_mod_tpt_led_trig(local,
1282 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1283 }
1284
1285 /*
1286 * Copy the hopefully now-present MAC address to
1287 * this interface, if it has the special null one.
1288 */
1289 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1290 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1291 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1292
1293 if (!is_valid_ether_addr(dev->dev_addr)) {
1294 res = -EADDRNOTAVAIL;
1295 goto err_stop;
1296 }
1297 }
1298
1299 switch (sdata->vif.type) {
1300 case NL80211_IFTYPE_AP_VLAN:
1301 /* no need to tell driver, but set carrier and chanctx */
1302 if (sdata->bss->active) {
1303 ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1304 netif_carrier_on(dev);
1305 ieee80211_set_vif_encap_ops(sdata);
1306 } else {
1307 netif_carrier_off(dev);
1308 }
1309 break;
1310 case NL80211_IFTYPE_MONITOR:
1311 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1312 local->cooked_mntrs++;
1313 break;
1314 }
1315
1316 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1317 res = drv_add_interface(local, sdata);
1318 if (res)
1319 goto err_stop;
1320 } else if (local->monitors == 0 && local->open_count == 0) {
1321 res = ieee80211_add_virtual_monitor(local);
1322 if (res)
1323 goto err_stop;
1324 }
1325
1326 /* must be before the call to ieee80211_configure_filter */
1327 local->monitors++;
1328 if (local->monitors == 1) {
1329 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1330 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1331 }
1332
1333 ieee80211_adjust_monitor_flags(sdata, 1);
1334 ieee80211_configure_filter(local);
1335 ieee80211_recalc_offload(local);
1336 ieee80211_recalc_idle(local);
1337
1338 netif_carrier_on(dev);
1339 break;
1340 default:
1341 if (coming_up) {
1342 ieee80211_del_virtual_monitor(local);
1343 ieee80211_set_sdata_offload_flags(sdata);
1344
1345 res = drv_add_interface(local, sdata);
1346 if (res)
1347 goto err_stop;
1348
1349 ieee80211_set_vif_encap_ops(sdata);
1350 res = ieee80211_check_queues(sdata,
1351 ieee80211_vif_type_p2p(&sdata->vif));
1352 if (res)
1353 goto err_del_interface;
1354 }
1355
1356 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1357 local->fif_pspoll++;
1358 local->fif_probe_req++;
1359
1360 ieee80211_configure_filter(local);
1361 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1362 local->fif_probe_req++;
1363 }
1364
1365 if (sdata->vif.probe_req_reg)
1366 drv_config_iface_filter(local, sdata,
1367 FIF_PROBE_REQ,
1368 FIF_PROBE_REQ);
1369
1370 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1371 sdata->vif.type != NL80211_IFTYPE_NAN)
1372 changed |= ieee80211_reset_erp_info(sdata);
1373 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1374 changed);
1375
1376 switch (sdata->vif.type) {
1377 case NL80211_IFTYPE_STATION:
1378 case NL80211_IFTYPE_ADHOC:
1379 case NL80211_IFTYPE_AP:
1380 case NL80211_IFTYPE_MESH_POINT:
1381 case NL80211_IFTYPE_OCB:
1382 netif_carrier_off(dev);
1383 break;
1384 case NL80211_IFTYPE_P2P_DEVICE:
1385 case NL80211_IFTYPE_NAN:
1386 break;
1387 default:
1388 /* not reached */
1389 WARN_ON(1);
1390 }
1391
1392 /*
1393 * Set default queue parameters so drivers don't
1394 * need to initialise the hardware if the hardware
1395 * doesn't start up with sane defaults.
1396 * Enable QoS for anything but station interfaces.
1397 */
1398 ieee80211_set_wmm_default(&sdata->deflink, true,
1399 sdata->vif.type != NL80211_IFTYPE_STATION);
1400 }
1401
1402 switch (sdata->vif.type) {
1403 case NL80211_IFTYPE_P2P_DEVICE:
1404 rcu_assign_pointer(local->p2p_sdata, sdata);
1405 break;
1406 case NL80211_IFTYPE_MONITOR:
1407 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1408 break;
1409 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1410 break;
1411 default:
1412 break;
1413 }
1414
1415 /*
1416 * set_multicast_list will be invoked by the networking core
1417 * which will check whether any increments here were done in
1418 * error and sync them down to the hardware as filter flags.
1419 */
1420 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1421 atomic_inc(&local->iff_allmultis);
1422
1423 if (coming_up)
1424 local->open_count++;
1425
1426 if (local->open_count == 1)
1427 ieee80211_hw_conf_init(local);
1428 else if (hw_reconf_flags)
1429 ieee80211_hw_config(local, hw_reconf_flags);
1430
1431 ieee80211_recalc_ps(local);
1432
1433 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1434
1435 return 0;
1436 err_del_interface:
1437 drv_remove_interface(local, sdata);
1438 err_stop:
1439 if (!local->open_count)
1440 drv_stop(local, false);
1441 err_del_bss:
1442 sdata->bss = NULL;
1443 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1444 list_del(&sdata->u.vlan.list);
1445 /* might already be clear but that doesn't matter */
1446 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1447 return res;
1448 }
1449
ieee80211_if_setup(struct net_device * dev)1450 static void ieee80211_if_setup(struct net_device *dev)
1451 {
1452 ether_setup(dev);
1453 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1454 dev->priv_flags |= IFF_NO_QUEUE;
1455 dev->netdev_ops = &ieee80211_dataif_ops;
1456 dev->needs_free_netdev = true;
1457 }
1458
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1459 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1460 struct ieee80211_sub_if_data *sdata,
1461 struct sk_buff *skb)
1462 {
1463 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1464
1465 lockdep_assert_wiphy(local->hw.wiphy);
1466
1467 if (ieee80211_is_action(mgmt->frame_control) &&
1468 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1469 struct sta_info *sta;
1470 int len = skb->len;
1471
1472 sta = sta_info_get_bss(sdata, mgmt->sa);
1473 if (sta) {
1474 switch (mgmt->u.action.u.addba_req.action_code) {
1475 case WLAN_ACTION_ADDBA_REQ:
1476 ieee80211_process_addba_request(local, sta,
1477 mgmt, len);
1478 break;
1479 case WLAN_ACTION_ADDBA_RESP:
1480 ieee80211_process_addba_resp(local, sta,
1481 mgmt, len);
1482 break;
1483 case WLAN_ACTION_DELBA:
1484 ieee80211_process_delba(sdata, sta,
1485 mgmt, len);
1486 break;
1487 default:
1488 WARN_ON(1);
1489 break;
1490 }
1491 }
1492 } else if (ieee80211_is_action(mgmt->frame_control) &&
1493 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1494 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1495 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1496 struct ieee80211_rx_status *status;
1497 enum nl80211_band band;
1498 struct sta_info *sta;
1499 u8 opmode;
1500
1501 status = IEEE80211_SKB_RXCB(skb);
1502 band = status->band;
1503 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1504
1505 sta = sta_info_get_bss(sdata, mgmt->sa);
1506
1507 if (sta)
1508 ieee80211_vht_handle_opmode(sdata,
1509 &sta->deflink,
1510 opmode, band);
1511
1512 break;
1513 }
1514 case WLAN_VHT_ACTION_GROUPID_MGMT:
1515 ieee80211_process_mu_groups(sdata, &sdata->deflink,
1516 mgmt);
1517 break;
1518 default:
1519 WARN_ON(1);
1520 break;
1521 }
1522 } else if (ieee80211_is_action(mgmt->frame_control) &&
1523 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1524 switch (mgmt->u.action.u.s1g.action_code) {
1525 case WLAN_S1G_TWT_TEARDOWN:
1526 case WLAN_S1G_TWT_SETUP:
1527 ieee80211_s1g_rx_twt_action(sdata, skb);
1528 break;
1529 default:
1530 break;
1531 }
1532 } else if (ieee80211_is_action(mgmt->frame_control) &&
1533 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) {
1534 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1535 switch (mgmt->u.action.u.ttlm_req.action_code) {
1536 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
1537 ieee80211_process_neg_ttlm_req(sdata, mgmt,
1538 skb->len);
1539 break;
1540 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
1541 ieee80211_process_neg_ttlm_res(sdata, mgmt,
1542 skb->len);
1543 break;
1544 default:
1545 break;
1546 }
1547 }
1548 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1549 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1550 ieee80211_sta_rx_queued_ext(sdata, skb);
1551 else
1552 WARN_ON(1);
1553 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1554 struct ieee80211_hdr *hdr = (void *)mgmt;
1555 struct sta_info *sta;
1556
1557 /*
1558 * So the frame isn't mgmt, but frame_control
1559 * is at the right place anyway, of course, so
1560 * the if statement is correct.
1561 *
1562 * Warn if we have other data frame types here,
1563 * they must not get here.
1564 */
1565 WARN_ON(hdr->frame_control &
1566 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1567 WARN_ON(!(hdr->seq_ctrl &
1568 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1569 /*
1570 * This was a fragment of a frame, received while
1571 * a block-ack session was active. That cannot be
1572 * right, so terminate the session.
1573 */
1574 sta = sta_info_get_bss(sdata, mgmt->sa);
1575 if (sta) {
1576 u16 tid = ieee80211_get_tid(hdr);
1577
1578 __ieee80211_stop_rx_ba_session(
1579 sta, tid, WLAN_BACK_RECIPIENT,
1580 WLAN_REASON_QSTA_REQUIRE_SETUP,
1581 true);
1582 }
1583 } else switch (sdata->vif.type) {
1584 case NL80211_IFTYPE_STATION:
1585 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1586 break;
1587 case NL80211_IFTYPE_ADHOC:
1588 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1589 break;
1590 case NL80211_IFTYPE_MESH_POINT:
1591 if (!ieee80211_vif_is_mesh(&sdata->vif))
1592 break;
1593 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1594 break;
1595 default:
1596 WARN(1, "frame for unexpected interface type");
1597 break;
1598 }
1599 }
1600
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1601 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1602 struct sk_buff *skb)
1603 {
1604 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1605
1606 if (ieee80211_is_action(mgmt->frame_control) &&
1607 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1608 switch (mgmt->u.action.u.s1g.action_code) {
1609 case WLAN_S1G_TWT_TEARDOWN:
1610 case WLAN_S1G_TWT_SETUP:
1611 ieee80211_s1g_status_twt_action(sdata, skb);
1612 break;
1613 default:
1614 break;
1615 }
1616 }
1617 }
1618
ieee80211_iface_work(struct wiphy * wiphy,struct wiphy_work * work)1619 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1620 {
1621 struct ieee80211_sub_if_data *sdata =
1622 container_of(work, struct ieee80211_sub_if_data, work);
1623 struct ieee80211_local *local = sdata->local;
1624 struct sk_buff *skb;
1625
1626 if (!ieee80211_sdata_running(sdata))
1627 return;
1628
1629 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1630 return;
1631
1632 if (!ieee80211_can_run_worker(local))
1633 return;
1634
1635 /* first process frames */
1636 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1637 kcov_remote_start_common(skb_get_kcov_handle(skb));
1638
1639 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1640 ieee80211_process_tdls_channel_switch(sdata, skb);
1641 else
1642 ieee80211_iface_process_skb(local, sdata, skb);
1643
1644 kfree_skb(skb);
1645 kcov_remote_stop();
1646 }
1647
1648 /* process status queue */
1649 while ((skb = skb_dequeue(&sdata->status_queue))) {
1650 kcov_remote_start_common(skb_get_kcov_handle(skb));
1651
1652 ieee80211_iface_process_status(sdata, skb);
1653 kfree_skb(skb);
1654
1655 kcov_remote_stop();
1656 }
1657
1658 /* then other type-dependent work */
1659 switch (sdata->vif.type) {
1660 case NL80211_IFTYPE_STATION:
1661 ieee80211_sta_work(sdata);
1662 break;
1663 case NL80211_IFTYPE_ADHOC:
1664 ieee80211_ibss_work(sdata);
1665 break;
1666 case NL80211_IFTYPE_MESH_POINT:
1667 if (!ieee80211_vif_is_mesh(&sdata->vif))
1668 break;
1669 ieee80211_mesh_work(sdata);
1670 break;
1671 case NL80211_IFTYPE_OCB:
1672 ieee80211_ocb_work(sdata);
1673 break;
1674 default:
1675 break;
1676 }
1677 }
1678
ieee80211_activate_links_work(struct wiphy * wiphy,struct wiphy_work * work)1679 static void ieee80211_activate_links_work(struct wiphy *wiphy,
1680 struct wiphy_work *work)
1681 {
1682 struct ieee80211_sub_if_data *sdata =
1683 container_of(work, struct ieee80211_sub_if_data,
1684 activate_links_work);
1685 struct ieee80211_local *local = wiphy_priv(wiphy);
1686
1687 if (local->in_reconfig)
1688 return;
1689
1690 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1691 sdata->desired_active_links = 0;
1692 }
1693
1694 /*
1695 * Helper function to initialise an interface to a specific type.
1696 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1697 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1698 enum nl80211_iftype type)
1699 {
1700 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1701 0xff, 0xff, 0xff};
1702
1703 /* clear type-dependent unions */
1704 memset(&sdata->u, 0, sizeof(sdata->u));
1705 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1706
1707 /* and set some type-dependent values */
1708 sdata->vif.type = type;
1709 sdata->vif.p2p = false;
1710 sdata->wdev.iftype = type;
1711
1712 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1713 sdata->control_port_no_encrypt = false;
1714 sdata->control_port_over_nl80211 = false;
1715 sdata->control_port_no_preauth = false;
1716 sdata->vif.cfg.idle = true;
1717 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1718
1719 sdata->noack_map = 0;
1720
1721 /* only monitor/p2p-device differ */
1722 if (sdata->dev) {
1723 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1724 sdata->dev->type = ARPHRD_ETHER;
1725 }
1726
1727 skb_queue_head_init(&sdata->skb_queue);
1728 skb_queue_head_init(&sdata->status_queue);
1729 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1730 wiphy_work_init(&sdata->activate_links_work,
1731 ieee80211_activate_links_work);
1732 wiphy_delayed_work_init(&sdata->dfs_cac_timer_work,
1733 ieee80211_dfs_cac_timer_work);
1734
1735 switch (type) {
1736 case NL80211_IFTYPE_P2P_GO:
1737 type = NL80211_IFTYPE_AP;
1738 sdata->vif.type = type;
1739 sdata->vif.p2p = true;
1740 fallthrough;
1741 case NL80211_IFTYPE_AP:
1742 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1743 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1744 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1745 break;
1746 case NL80211_IFTYPE_P2P_CLIENT:
1747 type = NL80211_IFTYPE_STATION;
1748 sdata->vif.type = type;
1749 sdata->vif.p2p = true;
1750 fallthrough;
1751 case NL80211_IFTYPE_STATION:
1752 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1753 ieee80211_sta_setup_sdata(sdata);
1754 break;
1755 case NL80211_IFTYPE_OCB:
1756 sdata->vif.bss_conf.bssid = bssid_wildcard;
1757 ieee80211_ocb_setup_sdata(sdata);
1758 break;
1759 case NL80211_IFTYPE_ADHOC:
1760 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1761 ieee80211_ibss_setup_sdata(sdata);
1762 break;
1763 case NL80211_IFTYPE_MESH_POINT:
1764 if (ieee80211_vif_is_mesh(&sdata->vif))
1765 ieee80211_mesh_init_sdata(sdata);
1766 break;
1767 case NL80211_IFTYPE_MONITOR:
1768 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1769 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1770 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1771 MONITOR_FLAG_OTHER_BSS;
1772 break;
1773 case NL80211_IFTYPE_NAN:
1774 idr_init(&sdata->u.nan.function_inst_ids);
1775 spin_lock_init(&sdata->u.nan.func_lock);
1776 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1777 break;
1778 case NL80211_IFTYPE_AP_VLAN:
1779 case NL80211_IFTYPE_P2P_DEVICE:
1780 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1781 break;
1782 case NL80211_IFTYPE_UNSPECIFIED:
1783 case NL80211_IFTYPE_WDS:
1784 case NUM_NL80211_IFTYPES:
1785 WARN_ON(1);
1786 break;
1787 }
1788
1789 /* need to do this after the switch so vif.type is correct */
1790 ieee80211_link_setup(&sdata->deflink);
1791
1792 ieee80211_debugfs_recreate_netdev(sdata, false);
1793 }
1794
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1795 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1796 enum nl80211_iftype type)
1797 {
1798 struct ieee80211_local *local = sdata->local;
1799 int ret, err;
1800 enum nl80211_iftype internal_type = type;
1801 bool p2p = false;
1802
1803 ASSERT_RTNL();
1804
1805 if (!local->ops->change_interface)
1806 return -EBUSY;
1807
1808 /* for now, don't support changing while links exist */
1809 if (ieee80211_vif_is_mld(&sdata->vif))
1810 return -EBUSY;
1811
1812 switch (sdata->vif.type) {
1813 case NL80211_IFTYPE_AP:
1814 if (!list_empty(&sdata->u.ap.vlans))
1815 return -EBUSY;
1816 break;
1817 case NL80211_IFTYPE_STATION:
1818 case NL80211_IFTYPE_ADHOC:
1819 case NL80211_IFTYPE_OCB:
1820 /*
1821 * Could maybe also all others here?
1822 * Just not sure how that interacts
1823 * with the RX/config path e.g. for
1824 * mesh.
1825 */
1826 break;
1827 default:
1828 return -EBUSY;
1829 }
1830
1831 switch (type) {
1832 case NL80211_IFTYPE_AP:
1833 case NL80211_IFTYPE_STATION:
1834 case NL80211_IFTYPE_ADHOC:
1835 case NL80211_IFTYPE_OCB:
1836 /*
1837 * Could probably support everything
1838 * but here.
1839 */
1840 break;
1841 case NL80211_IFTYPE_P2P_CLIENT:
1842 p2p = true;
1843 internal_type = NL80211_IFTYPE_STATION;
1844 break;
1845 case NL80211_IFTYPE_P2P_GO:
1846 p2p = true;
1847 internal_type = NL80211_IFTYPE_AP;
1848 break;
1849 default:
1850 return -EBUSY;
1851 }
1852
1853 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1854 if (ret)
1855 return ret;
1856
1857 ieee80211_stop_vif_queues(local, sdata,
1858 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1859 /* do_stop will synchronize_rcu() first thing */
1860 ieee80211_do_stop(sdata, false);
1861
1862 ieee80211_teardown_sdata(sdata);
1863
1864 ieee80211_set_sdata_offload_flags(sdata);
1865 ret = drv_change_interface(local, sdata, internal_type, p2p);
1866 if (ret)
1867 type = ieee80211_vif_type_p2p(&sdata->vif);
1868
1869 /*
1870 * Ignore return value here, there's not much we can do since
1871 * the driver changed the interface type internally already.
1872 * The warnings will hopefully make driver authors fix it :-)
1873 */
1874 ieee80211_check_queues(sdata, type);
1875
1876 ieee80211_setup_sdata(sdata, type);
1877 ieee80211_set_vif_encap_ops(sdata);
1878
1879 err = ieee80211_do_open(&sdata->wdev, false);
1880 WARN(err, "type change: do_open returned %d", err);
1881
1882 ieee80211_wake_vif_queues(local, sdata,
1883 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1884 return ret;
1885 }
1886
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1887 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1888 enum nl80211_iftype type)
1889 {
1890 int ret;
1891
1892 ASSERT_RTNL();
1893
1894 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1895 return 0;
1896
1897 if (ieee80211_sdata_running(sdata)) {
1898 ret = ieee80211_runtime_change_iftype(sdata, type);
1899 if (ret)
1900 return ret;
1901 } else {
1902 /* Purge and reset type-dependent state. */
1903 ieee80211_teardown_sdata(sdata);
1904 ieee80211_setup_sdata(sdata, type);
1905 }
1906
1907 /* reset some values that shouldn't be kept across type changes */
1908 if (type == NL80211_IFTYPE_STATION)
1909 sdata->u.mgd.use_4addr = false;
1910
1911 return 0;
1912 }
1913
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1914 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1915 u8 *perm_addr, enum nl80211_iftype type)
1916 {
1917 struct ieee80211_sub_if_data *sdata;
1918 u64 mask, start, addr, val, inc;
1919 u8 *m;
1920 u8 tmp_addr[ETH_ALEN];
1921 int i;
1922
1923 lockdep_assert_wiphy(local->hw.wiphy);
1924
1925 /* default ... something at least */
1926 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1927
1928 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1929 local->hw.wiphy->n_addresses <= 1)
1930 return;
1931
1932 switch (type) {
1933 case NL80211_IFTYPE_MONITOR:
1934 /* doesn't matter */
1935 break;
1936 case NL80211_IFTYPE_AP_VLAN:
1937 /* match up with an AP interface */
1938 list_for_each_entry(sdata, &local->interfaces, list) {
1939 if (sdata->vif.type != NL80211_IFTYPE_AP)
1940 continue;
1941 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1942 break;
1943 }
1944 /* keep default if no AP interface present */
1945 break;
1946 case NL80211_IFTYPE_P2P_CLIENT:
1947 case NL80211_IFTYPE_P2P_GO:
1948 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1949 list_for_each_entry(sdata, &local->interfaces, list) {
1950 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1951 continue;
1952 if (!ieee80211_sdata_running(sdata))
1953 continue;
1954 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1955 return;
1956 }
1957 }
1958 fallthrough;
1959 default:
1960 /* assign a new address if possible -- try n_addresses first */
1961 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1962 bool used = false;
1963
1964 list_for_each_entry(sdata, &local->interfaces, list) {
1965 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1966 sdata->vif.addr)) {
1967 used = true;
1968 break;
1969 }
1970 }
1971
1972 if (!used) {
1973 memcpy(perm_addr,
1974 local->hw.wiphy->addresses[i].addr,
1975 ETH_ALEN);
1976 break;
1977 }
1978 }
1979
1980 /* try mask if available */
1981 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1982 break;
1983
1984 m = local->hw.wiphy->addr_mask;
1985 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1986 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1987 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1988
1989 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1990 /* not a contiguous mask ... not handled now! */
1991 pr_info("not contiguous\n");
1992 break;
1993 }
1994
1995 /*
1996 * Pick address of existing interface in case user changed
1997 * MAC address manually, default to perm_addr.
1998 */
1999 m = local->hw.wiphy->perm_addr;
2000 list_for_each_entry(sdata, &local->interfaces, list) {
2001 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2002 continue;
2003 m = sdata->vif.addr;
2004 break;
2005 }
2006 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2007 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2008 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2009
2010 inc = 1ULL<<__ffs64(mask);
2011 val = (start & mask);
2012 addr = (start & ~mask) | (val & mask);
2013 do {
2014 bool used = false;
2015
2016 tmp_addr[5] = addr >> 0*8;
2017 tmp_addr[4] = addr >> 1*8;
2018 tmp_addr[3] = addr >> 2*8;
2019 tmp_addr[2] = addr >> 3*8;
2020 tmp_addr[1] = addr >> 4*8;
2021 tmp_addr[0] = addr >> 5*8;
2022
2023 val += inc;
2024
2025 list_for_each_entry(sdata, &local->interfaces, list) {
2026 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2027 used = true;
2028 break;
2029 }
2030 }
2031
2032 if (!used) {
2033 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2034 break;
2035 }
2036 addr = (start & ~mask) | (val & mask);
2037 } while (addr != start);
2038
2039 break;
2040 }
2041 }
2042
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)2043 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2044 unsigned char name_assign_type,
2045 struct wireless_dev **new_wdev, enum nl80211_iftype type,
2046 struct vif_params *params)
2047 {
2048 struct net_device *ndev = NULL;
2049 struct ieee80211_sub_if_data *sdata = NULL;
2050 struct txq_info *txqi;
2051 int ret, i;
2052
2053 ASSERT_RTNL();
2054 lockdep_assert_wiphy(local->hw.wiphy);
2055
2056 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2057 struct wireless_dev *wdev;
2058
2059 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2060 GFP_KERNEL);
2061 if (!sdata)
2062 return -ENOMEM;
2063 wdev = &sdata->wdev;
2064
2065 sdata->dev = NULL;
2066 strscpy(sdata->name, name, IFNAMSIZ);
2067 ieee80211_assign_perm_addr(local, wdev->address, type);
2068 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2069 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2070 } else {
2071 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2072 sizeof(void *));
2073 int txq_size = 0;
2074
2075 if (type != NL80211_IFTYPE_AP_VLAN &&
2076 (type != NL80211_IFTYPE_MONITOR ||
2077 (params->flags & MONITOR_FLAG_ACTIVE)))
2078 txq_size += sizeof(struct txq_info) +
2079 local->hw.txq_data_size;
2080
2081 ndev = alloc_netdev_mqs(size + txq_size,
2082 name, name_assign_type,
2083 ieee80211_if_setup, 1, 1);
2084 if (!ndev)
2085 return -ENOMEM;
2086
2087 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2088
2089 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2090
2091 ndev->needed_headroom = local->tx_headroom +
2092 4*6 /* four MAC addresses */
2093 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2094 + 6 /* mesh */
2095 + 8 /* rfc1042/bridge tunnel */
2096 - ETH_HLEN /* ethernet hard_header_len */
2097 + IEEE80211_ENCRYPT_HEADROOM;
2098 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2099
2100 ret = dev_alloc_name(ndev, ndev->name);
2101 if (ret < 0) {
2102 free_netdev(ndev);
2103 return ret;
2104 }
2105
2106 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2107 if (is_valid_ether_addr(params->macaddr))
2108 eth_hw_addr_set(ndev, params->macaddr);
2109 else
2110 eth_hw_addr_set(ndev, ndev->perm_addr);
2111 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2112
2113 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2114 sdata = netdev_priv(ndev);
2115 ndev->ieee80211_ptr = &sdata->wdev;
2116 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2117 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2118 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2119
2120 if (txq_size) {
2121 txqi = netdev_priv(ndev) + size;
2122 ieee80211_txq_init(sdata, NULL, txqi, 0);
2123 }
2124
2125 sdata->dev = ndev;
2126 }
2127
2128 /* initialise type-independent data */
2129 sdata->wdev.wiphy = local->hw.wiphy;
2130
2131 ieee80211_sdata_init(local, sdata);
2132
2133 ieee80211_init_frag_cache(&sdata->frags);
2134
2135 INIT_LIST_HEAD(&sdata->key_list);
2136
2137 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk,
2138 ieee80211_delayed_tailroom_dec);
2139
2140 for (i = 0; i < NUM_NL80211_BANDS; i++) {
2141 struct ieee80211_supported_band *sband;
2142 sband = local->hw.wiphy->bands[i];
2143 sdata->rc_rateidx_mask[i] =
2144 sband ? (1 << sband->n_bitrates) - 1 : 0;
2145 if (sband) {
2146 __le16 cap;
2147 u16 *vht_rate_mask;
2148
2149 memcpy(sdata->rc_rateidx_mcs_mask[i],
2150 sband->ht_cap.mcs.rx_mask,
2151 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2152
2153 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2154 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2155 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2156 } else {
2157 memset(sdata->rc_rateidx_mcs_mask[i], 0,
2158 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2159 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2160 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2161 }
2162 }
2163
2164 ieee80211_set_default_queues(sdata);
2165
2166 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2167 sdata->deflink.user_power_level = local->user_power_level;
2168
2169 /* setup type-dependent data */
2170 ieee80211_setup_sdata(sdata, type);
2171
2172 if (ndev) {
2173 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2174 if (type == NL80211_IFTYPE_STATION)
2175 sdata->u.mgd.use_4addr = params->use_4addr;
2176
2177 ndev->features |= local->hw.netdev_features;
2178 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2179 ndev->hw_features |= ndev->features &
2180 MAC80211_SUPPORTED_FEATURES_TX;
2181 sdata->vif.netdev_features = local->hw.netdev_features;
2182
2183 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2184
2185 /* MTU range is normally 256 - 2304, where the upper limit is
2186 * the maximum MSDU size. Monitor interfaces send and receive
2187 * MPDU and A-MSDU frames which may be much larger so we do
2188 * not impose an upper limit in that case.
2189 */
2190 ndev->min_mtu = 256;
2191 if (type == NL80211_IFTYPE_MONITOR)
2192 ndev->max_mtu = 0;
2193 else
2194 ndev->max_mtu = local->hw.max_mtu;
2195
2196 ret = cfg80211_register_netdevice(ndev);
2197 if (ret) {
2198 free_netdev(ndev);
2199 return ret;
2200 }
2201 }
2202
2203 mutex_lock(&local->iflist_mtx);
2204 list_add_tail_rcu(&sdata->list, &local->interfaces);
2205 mutex_unlock(&local->iflist_mtx);
2206
2207 if (new_wdev)
2208 *new_wdev = &sdata->wdev;
2209
2210 return 0;
2211 }
2212
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2213 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2214 {
2215 ASSERT_RTNL();
2216 lockdep_assert_wiphy(sdata->local->hw.wiphy);
2217
2218 mutex_lock(&sdata->local->iflist_mtx);
2219 list_del_rcu(&sdata->list);
2220 mutex_unlock(&sdata->local->iflist_mtx);
2221
2222 if (sdata->vif.txq)
2223 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2224
2225 synchronize_rcu();
2226
2227 cfg80211_unregister_wdev(&sdata->wdev);
2228
2229 if (!sdata->dev) {
2230 ieee80211_teardown_sdata(sdata);
2231 kfree(sdata);
2232 }
2233 }
2234
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2235 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2236 {
2237 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2238 return;
2239 ieee80211_do_stop(sdata, true);
2240 }
2241
ieee80211_remove_interfaces(struct ieee80211_local * local)2242 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2243 {
2244 struct ieee80211_sub_if_data *sdata, *tmp;
2245 LIST_HEAD(unreg_list);
2246
2247 ASSERT_RTNL();
2248
2249 /* Before destroying the interfaces, make sure they're all stopped so
2250 * that the hardware is stopped. Otherwise, the driver might still be
2251 * iterating the interfaces during the shutdown, e.g. from a worker
2252 * or from RX processing or similar, and if it does so (using atomic
2253 * iteration) while we're manipulating the list, the iteration will
2254 * crash.
2255 *
2256 * After this, the hardware should be stopped and the driver should
2257 * have stopped all of its activities, so that we can do RCU-unaware
2258 * manipulations of the interface list below.
2259 */
2260 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2261
2262 wiphy_lock(local->hw.wiphy);
2263
2264 WARN(local->open_count, "%s: open count remains %d\n",
2265 wiphy_name(local->hw.wiphy), local->open_count);
2266
2267 mutex_lock(&local->iflist_mtx);
2268 list_splice_init(&local->interfaces, &unreg_list);
2269 mutex_unlock(&local->iflist_mtx);
2270
2271 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2272 bool netdev = sdata->dev;
2273
2274 /*
2275 * Remove IP addresses explicitly, since the notifier will
2276 * skip the callbacks if wdev->registered is false, since
2277 * we can't acquire the wiphy_lock() again there if already
2278 * inside this locked section.
2279 */
2280 sdata->vif.cfg.arp_addr_cnt = 0;
2281 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2282 sdata->u.mgd.associated)
2283 ieee80211_vif_cfg_change_notify(sdata,
2284 BSS_CHANGED_ARP_FILTER);
2285
2286 list_del(&sdata->list);
2287 cfg80211_unregister_wdev(&sdata->wdev);
2288
2289 if (!netdev)
2290 kfree(sdata);
2291 }
2292 wiphy_unlock(local->hw.wiphy);
2293 }
2294
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2295 static int netdev_notify(struct notifier_block *nb,
2296 unsigned long state, void *ptr)
2297 {
2298 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2299 struct ieee80211_sub_if_data *sdata;
2300
2301 if (state != NETDEV_CHANGENAME)
2302 return NOTIFY_DONE;
2303
2304 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2305 return NOTIFY_DONE;
2306
2307 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2308 return NOTIFY_DONE;
2309
2310 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2311 memcpy(sdata->name, dev->name, IFNAMSIZ);
2312 ieee80211_debugfs_rename_netdev(sdata);
2313
2314 return NOTIFY_OK;
2315 }
2316
2317 static struct notifier_block mac80211_netdev_notifier = {
2318 .notifier_call = netdev_notify,
2319 };
2320
ieee80211_iface_init(void)2321 int ieee80211_iface_init(void)
2322 {
2323 return register_netdevice_notifier(&mac80211_netdev_notifier);
2324 }
2325
ieee80211_iface_exit(void)2326 void ieee80211_iface_exit(void)
2327 {
2328 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2329 }
2330
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2331 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2332 {
2333 if (sdata->vif.type == NL80211_IFTYPE_AP)
2334 atomic_inc(&sdata->u.ap.num_mcast_sta);
2335 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2336 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2337 }
2338
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2339 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2340 {
2341 if (sdata->vif.type == NL80211_IFTYPE_AP)
2342 atomic_dec(&sdata->u.ap.num_mcast_sta);
2343 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2344 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2345 }
2346
ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data * sdata)2347 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata)
2348 {
2349 struct ieee80211_local *local = sdata->local;
2350
2351 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA))
2352 return;
2353
2354 ieee80211_stop_vif_queues(local, sdata,
2355 IEEE80211_QUEUE_STOP_REASON_CSA);
2356 sdata->csa_blocked_queues = true;
2357 }
2358
ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data * sdata)2359 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata)
2360 {
2361 struct ieee80211_local *local = sdata->local;
2362
2363 if (sdata->csa_blocked_queues) {
2364 ieee80211_wake_vif_queues(local, sdata,
2365 IEEE80211_QUEUE_STOP_REASON_CSA);
2366 sdata->csa_blocked_queues = false;
2367 }
2368 }
2369