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) 2018-2022 Intel Corporation
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/kcov.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29
30 /**
31 * DOC: Interface list locking
32 *
33 * The interface list in each struct ieee80211_local is protected
34 * three-fold:
35 *
36 * (1) modifications may only be done under the RTNL
37 * (2) modifications and readers are protected against each other by
38 * the iflist_mtx.
39 * (3) modifications are done in an RCU manner so atomic readers
40 * can traverse the list in RCU-safe blocks.
41 *
42 * As a consequence, reads (traversals) of the list can be protected
43 * by either the RTNL, the iflist_mtx or RCU.
44 */
45
46 static void ieee80211_iface_work(struct work_struct *work);
47
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
49 {
50 struct ieee80211_chanctx_conf *chanctx_conf;
51 int power;
52
53 rcu_read_lock();
54 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
55 if (!chanctx_conf) {
56 rcu_read_unlock();
57 return false;
58 }
59
60 power = ieee80211_chandef_max_power(&chanctx_conf->def);
61 rcu_read_unlock();
62
63 if (sdata->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 nsdata->wdev.use_4addr)
368 return -EOPNOTSUPP;
369
370 /*
371 * can only add VLANs to enabled APs
372 */
373 if (iftype == NL80211_IFTYPE_AP_VLAN &&
374 nsdata->vif.type == NL80211_IFTYPE_AP)
375 sdata->bss = &nsdata->u.ap;
376 }
377 }
378
379 mutex_lock(&local->chanctx_mtx);
380 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
381 mutex_unlock(&local->chanctx_mtx);
382 return ret;
383 }
384
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)385 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
386 enum nl80211_iftype iftype)
387 {
388 int n_queues = sdata->local->hw.queues;
389 int i;
390
391 if (iftype == NL80211_IFTYPE_NAN)
392 return 0;
393
394 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
395 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
396 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
397 IEEE80211_INVAL_HW_QUEUE))
398 return -EINVAL;
399 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
400 n_queues))
401 return -EINVAL;
402 }
403 }
404
405 if ((iftype != NL80211_IFTYPE_AP &&
406 iftype != NL80211_IFTYPE_P2P_GO &&
407 iftype != NL80211_IFTYPE_MESH_POINT) ||
408 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
409 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
410 return 0;
411 }
412
413 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
414 return -EINVAL;
415
416 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
417 return -EINVAL;
418
419 return 0;
420 }
421
ieee80211_open(struct net_device * dev)422 static int ieee80211_open(struct net_device *dev)
423 {
424 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
425 int err;
426
427 /* fail early if user set an invalid address */
428 if (!is_valid_ether_addr(dev->dev_addr))
429 return -EADDRNOTAVAIL;
430
431 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
432 if (err)
433 return err;
434
435 wiphy_lock(sdata->local->hw.wiphy);
436 err = ieee80211_do_open(&sdata->wdev, true);
437 wiphy_unlock(sdata->local->hw.wiphy);
438
439 return err;
440 }
441
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)442 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
443 {
444 struct ieee80211_local *local = sdata->local;
445 unsigned long flags;
446 struct sk_buff *skb, *tmp;
447 u32 hw_reconf_flags = 0;
448 int i, flushed;
449 struct ps_data *ps;
450 struct cfg80211_chan_def chandef;
451 bool cancel_scan;
452 struct cfg80211_nan_func *func;
453
454 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
455 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
456
457 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
458 if (cancel_scan)
459 ieee80211_scan_cancel(local);
460
461 /*
462 * Stop TX on this interface first.
463 */
464 if (!local->ops->wake_tx_queue && sdata->dev)
465 netif_tx_stop_all_queues(sdata->dev);
466
467 ieee80211_roc_purge(local, sdata);
468
469 switch (sdata->vif.type) {
470 case NL80211_IFTYPE_STATION:
471 ieee80211_mgd_stop(sdata);
472 break;
473 case NL80211_IFTYPE_ADHOC:
474 ieee80211_ibss_stop(sdata);
475 break;
476 case NL80211_IFTYPE_MONITOR:
477 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
478 break;
479 list_del_rcu(&sdata->u.mntr.list);
480 break;
481 default:
482 break;
483 }
484
485 /*
486 * Remove all stations associated with this interface.
487 *
488 * This must be done before calling ops->remove_interface()
489 * because otherwise we can later invoke ops->sta_notify()
490 * whenever the STAs are removed, and that invalidates driver
491 * assumptions about always getting a vif pointer that is valid
492 * (because if we remove a STA after ops->remove_interface()
493 * the driver will have removed the vif info already!)
494 *
495 * For AP_VLANs stations may exist since there's nothing else that
496 * would have removed them, but in other modes there shouldn't
497 * be any stations.
498 */
499 flushed = sta_info_flush(sdata);
500 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
501
502 /* don't count this interface for allmulti while it is down */
503 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
504 atomic_dec(&local->iff_allmultis);
505
506 if (sdata->vif.type == NL80211_IFTYPE_AP) {
507 local->fif_pspoll--;
508 local->fif_probe_req--;
509 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
510 local->fif_probe_req--;
511 }
512
513 if (sdata->dev) {
514 netif_addr_lock_bh(sdata->dev);
515 spin_lock_bh(&local->filter_lock);
516 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
517 sdata->dev->addr_len);
518 spin_unlock_bh(&local->filter_lock);
519 netif_addr_unlock_bh(sdata->dev);
520 }
521
522 del_timer_sync(&local->dynamic_ps_timer);
523 cancel_work_sync(&local->dynamic_ps_enable_work);
524
525 cancel_work_sync(&sdata->recalc_smps);
526
527 sdata_lock(sdata);
528 WARN(sdata->vif.valid_links,
529 "destroying interface with valid links 0x%04x\n",
530 sdata->vif.valid_links);
531
532 mutex_lock(&local->mtx);
533 sdata->vif.bss_conf.csa_active = false;
534 if (sdata->vif.type == NL80211_IFTYPE_STATION)
535 sdata->deflink.u.mgd.csa_waiting_bcn = false;
536 if (sdata->deflink.csa_block_tx) {
537 ieee80211_wake_vif_queues(local, sdata,
538 IEEE80211_QUEUE_STOP_REASON_CSA);
539 sdata->deflink.csa_block_tx = false;
540 }
541 mutex_unlock(&local->mtx);
542 sdata_unlock(sdata);
543
544 cancel_work_sync(&sdata->deflink.csa_finalize_work);
545 cancel_work_sync(&sdata->deflink.color_change_finalize_work);
546
547 cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
548
549 if (sdata->wdev.cac_started) {
550 chandef = sdata->vif.bss_conf.chandef;
551 WARN_ON(local->suspended);
552 mutex_lock(&local->mtx);
553 ieee80211_link_release_channel(&sdata->deflink);
554 mutex_unlock(&local->mtx);
555 cfg80211_cac_event(sdata->dev, &chandef,
556 NL80211_RADAR_CAC_ABORTED,
557 GFP_KERNEL);
558 }
559
560 if (sdata->vif.type == NL80211_IFTYPE_AP) {
561 WARN_ON(!list_empty(&sdata->u.ap.vlans));
562 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
563 /* remove all packets in parent bc_buf pointing to this dev */
564 ps = &sdata->bss->ps;
565
566 spin_lock_irqsave(&ps->bc_buf.lock, flags);
567 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
568 if (skb->dev == sdata->dev) {
569 __skb_unlink(skb, &ps->bc_buf);
570 local->total_ps_buffered--;
571 ieee80211_free_txskb(&local->hw, skb);
572 }
573 }
574 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
575 }
576
577 if (going_down)
578 local->open_count--;
579
580 switch (sdata->vif.type) {
581 case NL80211_IFTYPE_AP_VLAN:
582 mutex_lock(&local->mtx);
583 list_del(&sdata->u.vlan.list);
584 mutex_unlock(&local->mtx);
585 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
586 /* see comment in the default case below */
587 ieee80211_free_keys(sdata, true);
588 /* no need to tell driver */
589 break;
590 case NL80211_IFTYPE_MONITOR:
591 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
592 local->cooked_mntrs--;
593 break;
594 }
595
596 local->monitors--;
597 if (local->monitors == 0) {
598 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
599 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
600 }
601
602 ieee80211_adjust_monitor_flags(sdata, -1);
603 break;
604 case NL80211_IFTYPE_NAN:
605 /* clean all the functions */
606 spin_lock_bh(&sdata->u.nan.func_lock);
607
608 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
609 idr_remove(&sdata->u.nan.function_inst_ids, i);
610 cfg80211_free_nan_func(func);
611 }
612 idr_destroy(&sdata->u.nan.function_inst_ids);
613
614 spin_unlock_bh(&sdata->u.nan.func_lock);
615 break;
616 case NL80211_IFTYPE_P2P_DEVICE:
617 /* relies on synchronize_rcu() below */
618 RCU_INIT_POINTER(local->p2p_sdata, NULL);
619 fallthrough;
620 default:
621 cancel_work_sync(&sdata->work);
622 /*
623 * When we get here, the interface is marked down.
624 * Free the remaining keys, if there are any
625 * (which can happen in AP mode if userspace sets
626 * keys before the interface is operating)
627 *
628 * Force the key freeing to always synchronize_net()
629 * to wait for the RX path in case it is using this
630 * interface enqueuing frames at this very time on
631 * another CPU.
632 */
633 ieee80211_free_keys(sdata, true);
634 skb_queue_purge(&sdata->skb_queue);
635 skb_queue_purge(&sdata->status_queue);
636 }
637
638 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
639 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
640 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
641 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
642 if (info->control.vif == &sdata->vif) {
643 __skb_unlink(skb, &local->pending[i]);
644 ieee80211_free_txskb(&local->hw, skb);
645 }
646 }
647 }
648 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
649
650 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
651 ieee80211_txq_remove_vlan(local, sdata);
652
653 sdata->bss = NULL;
654
655 if (local->open_count == 0)
656 ieee80211_clear_tx_pending(local);
657
658 sdata->vif.bss_conf.beacon_int = 0;
659
660 /*
661 * If the interface goes down while suspended, presumably because
662 * the device was unplugged and that happens before our resume,
663 * then the driver is already unconfigured and the remainder of
664 * this function isn't needed.
665 * XXX: what about WoWLAN? If the device has software state, e.g.
666 * memory allocated, it might expect teardown commands from
667 * mac80211 here?
668 */
669 if (local->suspended) {
670 WARN_ON(local->wowlan);
671 WARN_ON(rcu_access_pointer(local->monitor_sdata));
672 return;
673 }
674
675 switch (sdata->vif.type) {
676 case NL80211_IFTYPE_AP_VLAN:
677 break;
678 case NL80211_IFTYPE_MONITOR:
679 if (local->monitors == 0)
680 ieee80211_del_virtual_monitor(local);
681
682 mutex_lock(&local->mtx);
683 ieee80211_recalc_idle(local);
684 mutex_unlock(&local->mtx);
685
686 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
687 break;
688
689 fallthrough;
690 default:
691 if (going_down)
692 drv_remove_interface(local, sdata);
693 }
694
695 ieee80211_recalc_ps(local);
696
697 if (cancel_scan)
698 flush_delayed_work(&local->scan_work);
699
700 if (local->open_count == 0) {
701 ieee80211_stop_device(local);
702
703 /* no reconfiguring after stop! */
704 return;
705 }
706
707 /* do after stop to avoid reconfiguring when we stop anyway */
708 ieee80211_configure_filter(local);
709 ieee80211_hw_config(local, hw_reconf_flags);
710
711 if (local->monitors == local->open_count)
712 ieee80211_add_virtual_monitor(local);
713 }
714
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)715 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
716 {
717 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
718 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
719
720 if (!tx_vif)
721 return;
722
723 tx_sdata = vif_to_sdata(tx_vif);
724 sdata->vif.mbssid_tx_vif = NULL;
725
726 list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
727 &tx_sdata->local->interfaces, list) {
728 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
729 non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
730 ieee80211_sdata_running(non_tx_sdata)) {
731 non_tx_sdata->vif.mbssid_tx_vif = NULL;
732 dev_close(non_tx_sdata->wdev.netdev);
733 }
734 }
735
736 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
737 tx_sdata->vif.mbssid_tx_vif = NULL;
738 dev_close(tx_sdata->wdev.netdev);
739 }
740 }
741
ieee80211_stop(struct net_device * dev)742 static int ieee80211_stop(struct net_device *dev)
743 {
744 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
745
746 /* close dependent VLAN and MBSSID interfaces before locking wiphy */
747 if (sdata->vif.type == NL80211_IFTYPE_AP) {
748 struct ieee80211_sub_if_data *vlan, *tmpsdata;
749
750 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
751 u.vlan.list)
752 dev_close(vlan->dev);
753
754 ieee80211_stop_mbssid(sdata);
755 }
756
757 cancel_work_sync(&sdata->activate_links_work);
758
759 wiphy_lock(sdata->local->hw.wiphy);
760 ieee80211_do_stop(sdata, true);
761 wiphy_unlock(sdata->local->hw.wiphy);
762
763 return 0;
764 }
765
ieee80211_set_multicast_list(struct net_device * dev)766 static void ieee80211_set_multicast_list(struct net_device *dev)
767 {
768 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
769 struct ieee80211_local *local = sdata->local;
770 int allmulti, sdata_allmulti;
771
772 allmulti = !!(dev->flags & IFF_ALLMULTI);
773 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
774
775 if (allmulti != sdata_allmulti) {
776 if (dev->flags & IFF_ALLMULTI)
777 atomic_inc(&local->iff_allmultis);
778 else
779 atomic_dec(&local->iff_allmultis);
780 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
781 }
782
783 spin_lock_bh(&local->filter_lock);
784 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
785 spin_unlock_bh(&local->filter_lock);
786 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
787 }
788
789 /*
790 * Called when the netdev is removed or, by the code below, before
791 * the interface type changes.
792 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)793 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
794 {
795 /* free extra data */
796 ieee80211_free_keys(sdata, false);
797
798 ieee80211_debugfs_remove_netdev(sdata);
799
800 ieee80211_destroy_frag_cache(&sdata->frags);
801
802 if (ieee80211_vif_is_mesh(&sdata->vif))
803 ieee80211_mesh_teardown_sdata(sdata);
804
805 ieee80211_vif_clear_links(sdata);
806 ieee80211_link_stop(&sdata->deflink);
807 }
808
ieee80211_uninit(struct net_device * dev)809 static void ieee80211_uninit(struct net_device *dev)
810 {
811 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
812 }
813
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)814 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
815 struct sk_buff *skb,
816 struct net_device *sb_dev)
817 {
818 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
819 }
820
821 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)822 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
823 {
824 dev_fetch_sw_netstats(stats, dev->tstats);
825 }
826
827 static const struct net_device_ops ieee80211_dataif_ops = {
828 .ndo_open = ieee80211_open,
829 .ndo_stop = ieee80211_stop,
830 .ndo_uninit = ieee80211_uninit,
831 .ndo_start_xmit = ieee80211_subif_start_xmit,
832 .ndo_set_rx_mode = ieee80211_set_multicast_list,
833 .ndo_set_mac_address = ieee80211_change_mac,
834 .ndo_select_queue = ieee80211_netdev_select_queue,
835 .ndo_get_stats64 = ieee80211_get_stats64,
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 .ndo_get_stats64 = ieee80211_get_stats64,
875 };
876
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)877 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
878 struct net_device_path *path)
879 {
880 struct ieee80211_sub_if_data *sdata;
881 struct ieee80211_local *local;
882 struct sta_info *sta;
883 int ret = -ENOENT;
884
885 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
886 local = sdata->local;
887
888 if (!local->ops->net_fill_forward_path)
889 return -EOPNOTSUPP;
890
891 rcu_read_lock();
892 switch (sdata->vif.type) {
893 case NL80211_IFTYPE_AP_VLAN:
894 sta = rcu_dereference(sdata->u.vlan.sta);
895 if (sta)
896 break;
897 if (sdata->wdev.use_4addr)
898 goto out;
899 if (is_multicast_ether_addr(ctx->daddr))
900 goto out;
901 sta = sta_info_get_bss(sdata, ctx->daddr);
902 break;
903 case NL80211_IFTYPE_AP:
904 if (is_multicast_ether_addr(ctx->daddr))
905 goto out;
906 sta = sta_info_get(sdata, ctx->daddr);
907 break;
908 case NL80211_IFTYPE_STATION:
909 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
910 sta = sta_info_get(sdata, ctx->daddr);
911 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
912 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
913 goto out;
914
915 break;
916 }
917 }
918
919 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
920 break;
921 default:
922 goto out;
923 }
924
925 if (!sta)
926 goto out;
927
928 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
929 out:
930 rcu_read_unlock();
931
932 return ret;
933 }
934
935 static const struct net_device_ops ieee80211_dataif_8023_ops = {
936 .ndo_open = ieee80211_open,
937 .ndo_stop = ieee80211_stop,
938 .ndo_uninit = ieee80211_uninit,
939 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
940 .ndo_set_rx_mode = ieee80211_set_multicast_list,
941 .ndo_set_mac_address = ieee80211_change_mac,
942 .ndo_select_queue = ieee80211_netdev_select_queue,
943 .ndo_get_stats64 = ieee80211_get_stats64,
944 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
945 };
946
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)947 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
948 {
949 switch (iftype) {
950 /* P2P GO and client are mapped to AP/STATION types */
951 case NL80211_IFTYPE_AP:
952 case NL80211_IFTYPE_STATION:
953 return true;
954 default:
955 return false;
956 }
957 }
958
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)959 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
960 {
961 struct ieee80211_local *local = sdata->local;
962 u32 flags;
963
964 flags = sdata->vif.offload_flags;
965
966 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
967 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
968 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
969
970 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
971 local->hw.wiphy->frag_threshold != (u32)-1)
972 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
973
974 if (local->monitors)
975 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
976 } else {
977 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
978 }
979
980 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
981 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
982 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
983
984 if (local->monitors &&
985 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
986 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
987 } else {
988 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
989 }
990
991 if (sdata->vif.offload_flags == flags)
992 return false;
993
994 sdata->vif.offload_flags = flags;
995 ieee80211_check_fast_rx_iface(sdata);
996 return true;
997 }
998
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)999 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1000 {
1001 struct ieee80211_local *local = sdata->local;
1002 struct ieee80211_sub_if_data *bss = sdata;
1003 bool enabled;
1004
1005 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1006 if (!sdata->bss)
1007 return;
1008
1009 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1010 }
1011
1012 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1013 !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1014 return;
1015
1016 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1017 if (sdata->wdev.use_4addr &&
1018 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1019 enabled = false;
1020
1021 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1022 &ieee80211_dataif_ops;
1023 }
1024
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1025 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1026 {
1027 struct ieee80211_local *local = sdata->local;
1028 struct ieee80211_sub_if_data *vsdata;
1029
1030 if (ieee80211_set_sdata_offload_flags(sdata)) {
1031 drv_update_vif_offload(local, sdata);
1032 ieee80211_set_vif_encap_ops(sdata);
1033 }
1034
1035 list_for_each_entry(vsdata, &local->interfaces, list) {
1036 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1037 vsdata->bss != &sdata->u.ap)
1038 continue;
1039
1040 ieee80211_set_vif_encap_ops(vsdata);
1041 }
1042 }
1043
ieee80211_recalc_offload(struct ieee80211_local * local)1044 void ieee80211_recalc_offload(struct ieee80211_local *local)
1045 {
1046 struct ieee80211_sub_if_data *sdata;
1047
1048 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1049 return;
1050
1051 mutex_lock(&local->iflist_mtx);
1052
1053 list_for_each_entry(sdata, &local->interfaces, list) {
1054 if (!ieee80211_sdata_running(sdata))
1055 continue;
1056
1057 ieee80211_recalc_sdata_offload(sdata);
1058 }
1059
1060 mutex_unlock(&local->iflist_mtx);
1061 }
1062
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1063 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1064 const int offset)
1065 {
1066 struct ieee80211_local *local = sdata->local;
1067 u32 flags = sdata->u.mntr.flags;
1068
1069 #define ADJUST(_f, _s) do { \
1070 if (flags & MONITOR_FLAG_##_f) \
1071 local->fif_##_s += offset; \
1072 } while (0)
1073
1074 ADJUST(FCSFAIL, fcsfail);
1075 ADJUST(PLCPFAIL, plcpfail);
1076 ADJUST(CONTROL, control);
1077 ADJUST(CONTROL, pspoll);
1078 ADJUST(OTHER_BSS, other_bss);
1079
1080 #undef ADJUST
1081 }
1082
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1083 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1084 {
1085 struct ieee80211_local *local = sdata->local;
1086 int i;
1087
1088 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1089 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1090 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1091 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1092 sdata->vif.hw_queue[i] = i;
1093 else
1094 sdata->vif.hw_queue[i] = 0;
1095 }
1096 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1097 }
1098
ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1099 static void ieee80211_sdata_init(struct ieee80211_local *local,
1100 struct ieee80211_sub_if_data *sdata)
1101 {
1102 sdata->local = local;
1103
1104 /*
1105 * Initialize the default link, so we can use link_id 0 for non-MLD,
1106 * and that continues to work for non-MLD-aware drivers that use just
1107 * vif.bss_conf instead of vif.link_conf.
1108 *
1109 * Note that we never change this, so if link ID 0 isn't used in an
1110 * MLD connection, we get a separate allocation for it.
1111 */
1112 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1113 }
1114
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1115 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1116 {
1117 struct ieee80211_sub_if_data *sdata;
1118 int ret;
1119
1120 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1121 return 0;
1122
1123 ASSERT_RTNL();
1124 lockdep_assert_wiphy(local->hw.wiphy);
1125
1126 if (local->monitor_sdata)
1127 return 0;
1128
1129 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1130 if (!sdata)
1131 return -ENOMEM;
1132
1133 /* set up data */
1134 sdata->vif.type = NL80211_IFTYPE_MONITOR;
1135 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1136 wiphy_name(local->hw.wiphy));
1137 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1138
1139 ieee80211_sdata_init(local, sdata);
1140
1141 ieee80211_set_default_queues(sdata);
1142
1143 ret = drv_add_interface(local, sdata);
1144 if (WARN_ON(ret)) {
1145 /* ok .. stupid driver, it asked for this! */
1146 kfree(sdata);
1147 return ret;
1148 }
1149
1150 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1151
1152 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1153 if (ret) {
1154 kfree(sdata);
1155 return ret;
1156 }
1157
1158 mutex_lock(&local->iflist_mtx);
1159 rcu_assign_pointer(local->monitor_sdata, sdata);
1160 mutex_unlock(&local->iflist_mtx);
1161
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 if (ret) {
1167 mutex_lock(&local->iflist_mtx);
1168 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1169 mutex_unlock(&local->iflist_mtx);
1170 synchronize_net();
1171 drv_remove_interface(local, sdata);
1172 kfree(sdata);
1173 return ret;
1174 }
1175
1176 skb_queue_head_init(&sdata->skb_queue);
1177 skb_queue_head_init(&sdata->status_queue);
1178 INIT_WORK(&sdata->work, ieee80211_iface_work);
1179
1180 return 0;
1181 }
1182
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1183 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1184 {
1185 struct ieee80211_sub_if_data *sdata;
1186
1187 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1188 return;
1189
1190 ASSERT_RTNL();
1191 lockdep_assert_wiphy(local->hw.wiphy);
1192
1193 mutex_lock(&local->iflist_mtx);
1194
1195 sdata = rcu_dereference_protected(local->monitor_sdata,
1196 lockdep_is_held(&local->iflist_mtx));
1197 if (!sdata) {
1198 mutex_unlock(&local->iflist_mtx);
1199 return;
1200 }
1201
1202 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1203 mutex_unlock(&local->iflist_mtx);
1204
1205 synchronize_net();
1206
1207 mutex_lock(&local->mtx);
1208 ieee80211_link_release_channel(&sdata->deflink);
1209 mutex_unlock(&local->mtx);
1210
1211 drv_remove_interface(local, sdata);
1212
1213 kfree(sdata);
1214 }
1215
1216 /*
1217 * NOTE: Be very careful when changing this function, it must NOT return
1218 * an error on interface type changes that have been pre-checked, so most
1219 * checks should be in ieee80211_check_concurrent_iface.
1220 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1221 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1222 {
1223 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1224 struct net_device *dev = wdev->netdev;
1225 struct ieee80211_local *local = sdata->local;
1226 u32 changed = 0;
1227 int res;
1228 u32 hw_reconf_flags = 0;
1229
1230 switch (sdata->vif.type) {
1231 case NL80211_IFTYPE_AP_VLAN: {
1232 struct ieee80211_sub_if_data *master;
1233
1234 if (!sdata->bss)
1235 return -ENOLINK;
1236
1237 mutex_lock(&local->mtx);
1238 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1239 mutex_unlock(&local->mtx);
1240
1241 master = container_of(sdata->bss,
1242 struct ieee80211_sub_if_data, u.ap);
1243 sdata->control_port_protocol =
1244 master->control_port_protocol;
1245 sdata->control_port_no_encrypt =
1246 master->control_port_no_encrypt;
1247 sdata->control_port_over_nl80211 =
1248 master->control_port_over_nl80211;
1249 sdata->control_port_no_preauth =
1250 master->control_port_no_preauth;
1251 sdata->vif.cab_queue = master->vif.cab_queue;
1252 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1253 sizeof(sdata->vif.hw_queue));
1254 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1255
1256 mutex_lock(&local->key_mtx);
1257 sdata->crypto_tx_tailroom_needed_cnt +=
1258 master->crypto_tx_tailroom_needed_cnt;
1259 mutex_unlock(&local->key_mtx);
1260
1261 break;
1262 }
1263 case NL80211_IFTYPE_AP:
1264 sdata->bss = &sdata->u.ap;
1265 break;
1266 case NL80211_IFTYPE_MESH_POINT:
1267 case NL80211_IFTYPE_STATION:
1268 case NL80211_IFTYPE_MONITOR:
1269 case NL80211_IFTYPE_ADHOC:
1270 case NL80211_IFTYPE_P2P_DEVICE:
1271 case NL80211_IFTYPE_OCB:
1272 case NL80211_IFTYPE_NAN:
1273 /* no special treatment */
1274 break;
1275 case NL80211_IFTYPE_UNSPECIFIED:
1276 case NUM_NL80211_IFTYPES:
1277 case NL80211_IFTYPE_P2P_CLIENT:
1278 case NL80211_IFTYPE_P2P_GO:
1279 case NL80211_IFTYPE_WDS:
1280 /* cannot happen */
1281 WARN_ON(1);
1282 break;
1283 }
1284
1285 if (local->open_count == 0) {
1286 res = drv_start(local);
1287 if (res)
1288 goto err_del_bss;
1289 /* we're brought up, everything changes */
1290 hw_reconf_flags = ~0;
1291 ieee80211_led_radio(local, true);
1292 ieee80211_mod_tpt_led_trig(local,
1293 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1294 }
1295
1296 /*
1297 * Copy the hopefully now-present MAC address to
1298 * this interface, if it has the special null one.
1299 */
1300 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1301 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1302 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1303
1304 if (!is_valid_ether_addr(dev->dev_addr)) {
1305 res = -EADDRNOTAVAIL;
1306 goto err_stop;
1307 }
1308 }
1309
1310 switch (sdata->vif.type) {
1311 case NL80211_IFTYPE_AP_VLAN:
1312 /* no need to tell driver, but set carrier and chanctx */
1313 if (sdata->bss->active) {
1314 ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1315 netif_carrier_on(dev);
1316 ieee80211_set_vif_encap_ops(sdata);
1317 } else {
1318 netif_carrier_off(dev);
1319 }
1320 break;
1321 case NL80211_IFTYPE_MONITOR:
1322 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1323 local->cooked_mntrs++;
1324 break;
1325 }
1326
1327 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1328 res = drv_add_interface(local, sdata);
1329 if (res)
1330 goto err_stop;
1331 } else if (local->monitors == 0 && local->open_count == 0) {
1332 res = ieee80211_add_virtual_monitor(local);
1333 if (res)
1334 goto err_stop;
1335 }
1336
1337 /* must be before the call to ieee80211_configure_filter */
1338 local->monitors++;
1339 if (local->monitors == 1) {
1340 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1341 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1342 }
1343
1344 ieee80211_adjust_monitor_flags(sdata, 1);
1345 ieee80211_configure_filter(local);
1346 ieee80211_recalc_offload(local);
1347 mutex_lock(&local->mtx);
1348 ieee80211_recalc_idle(local);
1349 mutex_unlock(&local->mtx);
1350
1351 netif_carrier_on(dev);
1352 break;
1353 default:
1354 if (coming_up) {
1355 ieee80211_del_virtual_monitor(local);
1356 ieee80211_set_sdata_offload_flags(sdata);
1357
1358 res = drv_add_interface(local, sdata);
1359 if (res)
1360 goto err_stop;
1361
1362 ieee80211_set_vif_encap_ops(sdata);
1363 res = ieee80211_check_queues(sdata,
1364 ieee80211_vif_type_p2p(&sdata->vif));
1365 if (res)
1366 goto err_del_interface;
1367 }
1368
1369 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1370 local->fif_pspoll++;
1371 local->fif_probe_req++;
1372
1373 ieee80211_configure_filter(local);
1374 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1375 local->fif_probe_req++;
1376 }
1377
1378 if (sdata->vif.probe_req_reg)
1379 drv_config_iface_filter(local, sdata,
1380 FIF_PROBE_REQ,
1381 FIF_PROBE_REQ);
1382
1383 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1384 sdata->vif.type != NL80211_IFTYPE_NAN)
1385 changed |= ieee80211_reset_erp_info(sdata);
1386 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1387 changed);
1388
1389 switch (sdata->vif.type) {
1390 case NL80211_IFTYPE_STATION:
1391 case NL80211_IFTYPE_ADHOC:
1392 case NL80211_IFTYPE_AP:
1393 case NL80211_IFTYPE_MESH_POINT:
1394 case NL80211_IFTYPE_OCB:
1395 netif_carrier_off(dev);
1396 break;
1397 case NL80211_IFTYPE_P2P_DEVICE:
1398 case NL80211_IFTYPE_NAN:
1399 break;
1400 default:
1401 /* not reached */
1402 WARN_ON(1);
1403 }
1404
1405 /*
1406 * Set default queue parameters so drivers don't
1407 * need to initialise the hardware if the hardware
1408 * doesn't start up with sane defaults.
1409 * Enable QoS for anything but station interfaces.
1410 */
1411 ieee80211_set_wmm_default(&sdata->deflink, true,
1412 sdata->vif.type != NL80211_IFTYPE_STATION);
1413 }
1414
1415 switch (sdata->vif.type) {
1416 case NL80211_IFTYPE_P2P_DEVICE:
1417 rcu_assign_pointer(local->p2p_sdata, sdata);
1418 break;
1419 case NL80211_IFTYPE_MONITOR:
1420 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1421 break;
1422 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1423 break;
1424 default:
1425 break;
1426 }
1427
1428 /*
1429 * set_multicast_list will be invoked by the networking core
1430 * which will check whether any increments here were done in
1431 * error and sync them down to the hardware as filter flags.
1432 */
1433 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1434 atomic_inc(&local->iff_allmultis);
1435
1436 if (coming_up)
1437 local->open_count++;
1438
1439 if (hw_reconf_flags)
1440 ieee80211_hw_config(local, hw_reconf_flags);
1441
1442 ieee80211_recalc_ps(local);
1443
1444 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1445 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1446 local->ops->wake_tx_queue) {
1447 /* XXX: for AP_VLAN, actually track AP queues */
1448 if (dev)
1449 netif_tx_start_all_queues(dev);
1450 } else if (dev) {
1451 unsigned long flags;
1452 int n_acs = IEEE80211_NUM_ACS;
1453 int ac;
1454
1455 if (local->hw.queues < IEEE80211_NUM_ACS)
1456 n_acs = 1;
1457
1458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1459 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1460 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1461 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1462 for (ac = 0; ac < n_acs; ac++) {
1463 int ac_queue = sdata->vif.hw_queue[ac];
1464
1465 if (local->queue_stop_reasons[ac_queue] == 0 &&
1466 skb_queue_empty(&local->pending[ac_queue]))
1467 netif_start_subqueue(dev, ac);
1468 }
1469 }
1470 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1471 }
1472
1473 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1474
1475 return 0;
1476 err_del_interface:
1477 drv_remove_interface(local, sdata);
1478 err_stop:
1479 if (!local->open_count)
1480 drv_stop(local);
1481 err_del_bss:
1482 sdata->bss = NULL;
1483 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1484 mutex_lock(&local->mtx);
1485 list_del(&sdata->u.vlan.list);
1486 mutex_unlock(&local->mtx);
1487 }
1488 /* might already be clear but that doesn't matter */
1489 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1490 return res;
1491 }
1492
ieee80211_if_free(struct net_device * dev)1493 static void ieee80211_if_free(struct net_device *dev)
1494 {
1495 free_percpu(dev->tstats);
1496 }
1497
ieee80211_if_setup(struct net_device * dev)1498 static void ieee80211_if_setup(struct net_device *dev)
1499 {
1500 ether_setup(dev);
1501 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1502 dev->netdev_ops = &ieee80211_dataif_ops;
1503 dev->needs_free_netdev = true;
1504 dev->priv_destructor = ieee80211_if_free;
1505 }
1506
ieee80211_if_setup_no_queue(struct net_device * dev)1507 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1508 {
1509 ieee80211_if_setup(dev);
1510 dev->priv_flags |= IFF_NO_QUEUE;
1511 }
1512
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1513 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1514 struct ieee80211_sub_if_data *sdata,
1515 struct sk_buff *skb)
1516 {
1517 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1518
1519 if (ieee80211_is_action(mgmt->frame_control) &&
1520 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1521 struct sta_info *sta;
1522 int len = skb->len;
1523
1524 mutex_lock(&local->sta_mtx);
1525 sta = sta_info_get_bss(sdata, mgmt->sa);
1526 if (sta) {
1527 switch (mgmt->u.action.u.addba_req.action_code) {
1528 case WLAN_ACTION_ADDBA_REQ:
1529 ieee80211_process_addba_request(local, sta,
1530 mgmt, len);
1531 break;
1532 case WLAN_ACTION_ADDBA_RESP:
1533 ieee80211_process_addba_resp(local, sta,
1534 mgmt, len);
1535 break;
1536 case WLAN_ACTION_DELBA:
1537 ieee80211_process_delba(sdata, sta,
1538 mgmt, len);
1539 break;
1540 default:
1541 WARN_ON(1);
1542 break;
1543 }
1544 }
1545 mutex_unlock(&local->sta_mtx);
1546 } else if (ieee80211_is_action(mgmt->frame_control) &&
1547 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1548 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1549 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1550 struct ieee80211_rx_status *status;
1551 enum nl80211_band band;
1552 struct sta_info *sta;
1553 u8 opmode;
1554
1555 status = IEEE80211_SKB_RXCB(skb);
1556 band = status->band;
1557 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1558
1559 mutex_lock(&local->sta_mtx);
1560 sta = sta_info_get_bss(sdata, mgmt->sa);
1561
1562 if (sta)
1563 ieee80211_vht_handle_opmode(sdata,
1564 &sta->deflink,
1565 opmode, band);
1566
1567 mutex_unlock(&local->sta_mtx);
1568 break;
1569 }
1570 case WLAN_VHT_ACTION_GROUPID_MGMT:
1571 ieee80211_process_mu_groups(sdata, &sdata->deflink,
1572 mgmt);
1573 break;
1574 default:
1575 WARN_ON(1);
1576 break;
1577 }
1578 } else if (ieee80211_is_action(mgmt->frame_control) &&
1579 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1580 switch (mgmt->u.action.u.s1g.action_code) {
1581 case WLAN_S1G_TWT_TEARDOWN:
1582 case WLAN_S1G_TWT_SETUP:
1583 ieee80211_s1g_rx_twt_action(sdata, skb);
1584 break;
1585 default:
1586 break;
1587 }
1588 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1589 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1590 ieee80211_sta_rx_queued_ext(sdata, skb);
1591 else
1592 WARN_ON(1);
1593 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1594 struct ieee80211_hdr *hdr = (void *)mgmt;
1595 struct sta_info *sta;
1596
1597 /*
1598 * So the frame isn't mgmt, but frame_control
1599 * is at the right place anyway, of course, so
1600 * the if statement is correct.
1601 *
1602 * Warn if we have other data frame types here,
1603 * they must not get here.
1604 */
1605 WARN_ON(hdr->frame_control &
1606 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1607 WARN_ON(!(hdr->seq_ctrl &
1608 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1609 /*
1610 * This was a fragment of a frame, received while
1611 * a block-ack session was active. That cannot be
1612 * right, so terminate the session.
1613 */
1614 mutex_lock(&local->sta_mtx);
1615 sta = sta_info_get_bss(sdata, mgmt->sa);
1616 if (sta) {
1617 u16 tid = ieee80211_get_tid(hdr);
1618
1619 __ieee80211_stop_rx_ba_session(
1620 sta, tid, WLAN_BACK_RECIPIENT,
1621 WLAN_REASON_QSTA_REQUIRE_SETUP,
1622 true);
1623 }
1624 mutex_unlock(&local->sta_mtx);
1625 } else switch (sdata->vif.type) {
1626 case NL80211_IFTYPE_STATION:
1627 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1628 break;
1629 case NL80211_IFTYPE_ADHOC:
1630 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1631 break;
1632 case NL80211_IFTYPE_MESH_POINT:
1633 if (!ieee80211_vif_is_mesh(&sdata->vif))
1634 break;
1635 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1636 break;
1637 default:
1638 WARN(1, "frame for unexpected interface type");
1639 break;
1640 }
1641 }
1642
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1643 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1644 struct sk_buff *skb)
1645 {
1646 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1647
1648 if (ieee80211_is_action(mgmt->frame_control) &&
1649 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1650 switch (mgmt->u.action.u.s1g.action_code) {
1651 case WLAN_S1G_TWT_TEARDOWN:
1652 case WLAN_S1G_TWT_SETUP:
1653 ieee80211_s1g_status_twt_action(sdata, skb);
1654 break;
1655 default:
1656 break;
1657 }
1658 }
1659 }
1660
ieee80211_iface_work(struct work_struct * work)1661 static void ieee80211_iface_work(struct work_struct *work)
1662 {
1663 struct ieee80211_sub_if_data *sdata =
1664 container_of(work, struct ieee80211_sub_if_data, work);
1665 struct ieee80211_local *local = sdata->local;
1666 struct sk_buff *skb;
1667
1668 if (!ieee80211_sdata_running(sdata))
1669 return;
1670
1671 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1672 return;
1673
1674 if (!ieee80211_can_run_worker(local))
1675 return;
1676
1677 /* first process frames */
1678 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1679 kcov_remote_start_common(skb_get_kcov_handle(skb));
1680
1681 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1682 ieee80211_process_tdls_channel_switch(sdata, skb);
1683 else
1684 ieee80211_iface_process_skb(local, sdata, skb);
1685
1686 kfree_skb(skb);
1687 kcov_remote_stop();
1688 }
1689
1690 /* process status queue */
1691 while ((skb = skb_dequeue(&sdata->status_queue))) {
1692 kcov_remote_start_common(skb_get_kcov_handle(skb));
1693
1694 ieee80211_iface_process_status(sdata, skb);
1695 kfree_skb(skb);
1696
1697 kcov_remote_stop();
1698 }
1699
1700 /* then other type-dependent work */
1701 switch (sdata->vif.type) {
1702 case NL80211_IFTYPE_STATION:
1703 ieee80211_sta_work(sdata);
1704 break;
1705 case NL80211_IFTYPE_ADHOC:
1706 ieee80211_ibss_work(sdata);
1707 break;
1708 case NL80211_IFTYPE_MESH_POINT:
1709 if (!ieee80211_vif_is_mesh(&sdata->vif))
1710 break;
1711 ieee80211_mesh_work(sdata);
1712 break;
1713 case NL80211_IFTYPE_OCB:
1714 ieee80211_ocb_work(sdata);
1715 break;
1716 default:
1717 break;
1718 }
1719 }
1720
ieee80211_recalc_smps_work(struct work_struct * work)1721 static void ieee80211_recalc_smps_work(struct work_struct *work)
1722 {
1723 struct ieee80211_sub_if_data *sdata =
1724 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1725
1726 ieee80211_recalc_smps(sdata, &sdata->deflink);
1727 }
1728
ieee80211_activate_links_work(struct work_struct * work)1729 static void ieee80211_activate_links_work(struct work_struct *work)
1730 {
1731 struct ieee80211_sub_if_data *sdata =
1732 container_of(work, struct ieee80211_sub_if_data,
1733 activate_links_work);
1734
1735 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1736 }
1737
1738 /*
1739 * Helper function to initialise an interface to a specific type.
1740 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1741 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1742 enum nl80211_iftype type)
1743 {
1744 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1745 0xff, 0xff, 0xff};
1746
1747 /* clear type-dependent unions */
1748 memset(&sdata->u, 0, sizeof(sdata->u));
1749 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1750
1751 /* and set some type-dependent values */
1752 sdata->vif.type = type;
1753 sdata->vif.p2p = false;
1754 sdata->wdev.iftype = type;
1755
1756 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1757 sdata->control_port_no_encrypt = false;
1758 sdata->control_port_over_nl80211 = false;
1759 sdata->control_port_no_preauth = false;
1760 sdata->vif.cfg.idle = true;
1761 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1762
1763 sdata->noack_map = 0;
1764
1765 /* only monitor/p2p-device differ */
1766 if (sdata->dev) {
1767 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1768 sdata->dev->type = ARPHRD_ETHER;
1769 }
1770
1771 skb_queue_head_init(&sdata->skb_queue);
1772 skb_queue_head_init(&sdata->status_queue);
1773 INIT_WORK(&sdata->work, ieee80211_iface_work);
1774 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1775 INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1776
1777 switch (type) {
1778 case NL80211_IFTYPE_P2P_GO:
1779 type = NL80211_IFTYPE_AP;
1780 sdata->vif.type = type;
1781 sdata->vif.p2p = true;
1782 fallthrough;
1783 case NL80211_IFTYPE_AP:
1784 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1785 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1786 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1787 break;
1788 case NL80211_IFTYPE_P2P_CLIENT:
1789 type = NL80211_IFTYPE_STATION;
1790 sdata->vif.type = type;
1791 sdata->vif.p2p = true;
1792 fallthrough;
1793 case NL80211_IFTYPE_STATION:
1794 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1795 ieee80211_sta_setup_sdata(sdata);
1796 break;
1797 case NL80211_IFTYPE_OCB:
1798 sdata->vif.bss_conf.bssid = bssid_wildcard;
1799 ieee80211_ocb_setup_sdata(sdata);
1800 break;
1801 case NL80211_IFTYPE_ADHOC:
1802 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1803 ieee80211_ibss_setup_sdata(sdata);
1804 break;
1805 case NL80211_IFTYPE_MESH_POINT:
1806 if (ieee80211_vif_is_mesh(&sdata->vif))
1807 ieee80211_mesh_init_sdata(sdata);
1808 break;
1809 case NL80211_IFTYPE_MONITOR:
1810 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1811 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1812 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1813 MONITOR_FLAG_OTHER_BSS;
1814 break;
1815 case NL80211_IFTYPE_NAN:
1816 idr_init(&sdata->u.nan.function_inst_ids);
1817 spin_lock_init(&sdata->u.nan.func_lock);
1818 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1819 break;
1820 case NL80211_IFTYPE_AP_VLAN:
1821 case NL80211_IFTYPE_P2P_DEVICE:
1822 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1823 break;
1824 case NL80211_IFTYPE_UNSPECIFIED:
1825 case NL80211_IFTYPE_WDS:
1826 case NUM_NL80211_IFTYPES:
1827 WARN_ON(1);
1828 break;
1829 }
1830
1831 /* need to do this after the switch so vif.type is correct */
1832 ieee80211_link_setup(&sdata->deflink);
1833
1834 ieee80211_debugfs_add_netdev(sdata);
1835 }
1836
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1837 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1838 enum nl80211_iftype type)
1839 {
1840 struct ieee80211_local *local = sdata->local;
1841 int ret, err;
1842 enum nl80211_iftype internal_type = type;
1843 bool p2p = false;
1844
1845 ASSERT_RTNL();
1846
1847 if (!local->ops->change_interface)
1848 return -EBUSY;
1849
1850 /* for now, don't support changing while links exist */
1851 if (sdata->vif.valid_links)
1852 return -EBUSY;
1853
1854 switch (sdata->vif.type) {
1855 case NL80211_IFTYPE_AP:
1856 if (!list_empty(&sdata->u.ap.vlans))
1857 return -EBUSY;
1858 break;
1859 case NL80211_IFTYPE_STATION:
1860 case NL80211_IFTYPE_ADHOC:
1861 case NL80211_IFTYPE_OCB:
1862 /*
1863 * Could maybe also all others here?
1864 * Just not sure how that interacts
1865 * with the RX/config path e.g. for
1866 * mesh.
1867 */
1868 break;
1869 default:
1870 return -EBUSY;
1871 }
1872
1873 switch (type) {
1874 case NL80211_IFTYPE_AP:
1875 case NL80211_IFTYPE_STATION:
1876 case NL80211_IFTYPE_ADHOC:
1877 case NL80211_IFTYPE_OCB:
1878 /*
1879 * Could probably support everything
1880 * but here.
1881 */
1882 break;
1883 case NL80211_IFTYPE_P2P_CLIENT:
1884 p2p = true;
1885 internal_type = NL80211_IFTYPE_STATION;
1886 break;
1887 case NL80211_IFTYPE_P2P_GO:
1888 p2p = true;
1889 internal_type = NL80211_IFTYPE_AP;
1890 break;
1891 default:
1892 return -EBUSY;
1893 }
1894
1895 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1896 if (ret)
1897 return ret;
1898
1899 ieee80211_stop_vif_queues(local, sdata,
1900 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1901 synchronize_net();
1902
1903 ieee80211_do_stop(sdata, false);
1904
1905 ieee80211_teardown_sdata(sdata);
1906
1907 ieee80211_set_sdata_offload_flags(sdata);
1908 ret = drv_change_interface(local, sdata, internal_type, p2p);
1909 if (ret)
1910 type = ieee80211_vif_type_p2p(&sdata->vif);
1911
1912 /*
1913 * Ignore return value here, there's not much we can do since
1914 * the driver changed the interface type internally already.
1915 * The warnings will hopefully make driver authors fix it :-)
1916 */
1917 ieee80211_check_queues(sdata, type);
1918
1919 ieee80211_setup_sdata(sdata, type);
1920 ieee80211_set_vif_encap_ops(sdata);
1921
1922 err = ieee80211_do_open(&sdata->wdev, false);
1923 WARN(err, "type change: do_open returned %d", err);
1924
1925 ieee80211_wake_vif_queues(local, sdata,
1926 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1927 return ret;
1928 }
1929
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1930 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1931 enum nl80211_iftype type)
1932 {
1933 int ret;
1934
1935 ASSERT_RTNL();
1936
1937 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1938 return 0;
1939
1940 if (ieee80211_sdata_running(sdata)) {
1941 ret = ieee80211_runtime_change_iftype(sdata, type);
1942 if (ret)
1943 return ret;
1944 } else {
1945 /* Purge and reset type-dependent state. */
1946 ieee80211_teardown_sdata(sdata);
1947 ieee80211_setup_sdata(sdata, type);
1948 }
1949
1950 /* reset some values that shouldn't be kept across type changes */
1951 if (type == NL80211_IFTYPE_STATION)
1952 sdata->u.mgd.use_4addr = false;
1953
1954 return 0;
1955 }
1956
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1957 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1958 u8 *perm_addr, enum nl80211_iftype type)
1959 {
1960 struct ieee80211_sub_if_data *sdata;
1961 u64 mask, start, addr, val, inc;
1962 u8 *m;
1963 u8 tmp_addr[ETH_ALEN];
1964 int i;
1965
1966 /* default ... something at least */
1967 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1968
1969 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1970 local->hw.wiphy->n_addresses <= 1)
1971 return;
1972
1973 mutex_lock(&local->iflist_mtx);
1974
1975 switch (type) {
1976 case NL80211_IFTYPE_MONITOR:
1977 /* doesn't matter */
1978 break;
1979 case NL80211_IFTYPE_AP_VLAN:
1980 /* match up with an AP interface */
1981 list_for_each_entry(sdata, &local->interfaces, list) {
1982 if (sdata->vif.type != NL80211_IFTYPE_AP)
1983 continue;
1984 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1985 break;
1986 }
1987 /* keep default if no AP interface present */
1988 break;
1989 case NL80211_IFTYPE_P2P_CLIENT:
1990 case NL80211_IFTYPE_P2P_GO:
1991 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1992 list_for_each_entry(sdata, &local->interfaces, list) {
1993 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1994 continue;
1995 if (!ieee80211_sdata_running(sdata))
1996 continue;
1997 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1998 goto out_unlock;
1999 }
2000 }
2001 fallthrough;
2002 default:
2003 /* assign a new address if possible -- try n_addresses first */
2004 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
2005 bool used = false;
2006
2007 list_for_each_entry(sdata, &local->interfaces, list) {
2008 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
2009 sdata->vif.addr)) {
2010 used = true;
2011 break;
2012 }
2013 }
2014
2015 if (!used) {
2016 memcpy(perm_addr,
2017 local->hw.wiphy->addresses[i].addr,
2018 ETH_ALEN);
2019 break;
2020 }
2021 }
2022
2023 /* try mask if available */
2024 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2025 break;
2026
2027 m = local->hw.wiphy->addr_mask;
2028 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2029 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2030 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2031
2032 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2033 /* not a contiguous mask ... not handled now! */
2034 pr_info("not contiguous\n");
2035 break;
2036 }
2037
2038 /*
2039 * Pick address of existing interface in case user changed
2040 * MAC address manually, default to perm_addr.
2041 */
2042 m = local->hw.wiphy->perm_addr;
2043 list_for_each_entry(sdata, &local->interfaces, list) {
2044 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2045 continue;
2046 m = sdata->vif.addr;
2047 break;
2048 }
2049 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2050 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2051 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2052
2053 inc = 1ULL<<__ffs64(mask);
2054 val = (start & mask);
2055 addr = (start & ~mask) | (val & mask);
2056 do {
2057 bool used = false;
2058
2059 tmp_addr[5] = addr >> 0*8;
2060 tmp_addr[4] = addr >> 1*8;
2061 tmp_addr[3] = addr >> 2*8;
2062 tmp_addr[2] = addr >> 3*8;
2063 tmp_addr[1] = addr >> 4*8;
2064 tmp_addr[0] = addr >> 5*8;
2065
2066 val += inc;
2067
2068 list_for_each_entry(sdata, &local->interfaces, list) {
2069 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2070 used = true;
2071 break;
2072 }
2073 }
2074
2075 if (!used) {
2076 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2077 break;
2078 }
2079 addr = (start & ~mask) | (val & mask);
2080 } while (addr != start);
2081
2082 break;
2083 }
2084
2085 out_unlock:
2086 mutex_unlock(&local->iflist_mtx);
2087 }
2088
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)2089 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2090 unsigned char name_assign_type,
2091 struct wireless_dev **new_wdev, enum nl80211_iftype type,
2092 struct vif_params *params)
2093 {
2094 struct net_device *ndev = NULL;
2095 struct ieee80211_sub_if_data *sdata = NULL;
2096 struct txq_info *txqi;
2097 void (*if_setup)(struct net_device *dev);
2098 int ret, i;
2099 int txqs = 1;
2100
2101 ASSERT_RTNL();
2102
2103 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2104 struct wireless_dev *wdev;
2105
2106 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2107 GFP_KERNEL);
2108 if (!sdata)
2109 return -ENOMEM;
2110 wdev = &sdata->wdev;
2111
2112 sdata->dev = NULL;
2113 strscpy(sdata->name, name, IFNAMSIZ);
2114 ieee80211_assign_perm_addr(local, wdev->address, type);
2115 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2116 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2117 } else {
2118 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2119 sizeof(void *));
2120 int txq_size = 0;
2121
2122 if (local->ops->wake_tx_queue &&
2123 type != NL80211_IFTYPE_AP_VLAN &&
2124 (type != NL80211_IFTYPE_MONITOR ||
2125 (params->flags & MONITOR_FLAG_ACTIVE)))
2126 txq_size += sizeof(struct txq_info) +
2127 local->hw.txq_data_size;
2128
2129 if (local->ops->wake_tx_queue) {
2130 if_setup = ieee80211_if_setup_no_queue;
2131 } else {
2132 if_setup = ieee80211_if_setup;
2133 if (local->hw.queues >= IEEE80211_NUM_ACS)
2134 txqs = IEEE80211_NUM_ACS;
2135 }
2136
2137 ndev = alloc_netdev_mqs(size + txq_size,
2138 name, name_assign_type,
2139 if_setup, txqs, 1);
2140 if (!ndev)
2141 return -ENOMEM;
2142
2143 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
2144 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
2145
2146 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2147
2148 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2149 if (!ndev->tstats) {
2150 free_netdev(ndev);
2151 return -ENOMEM;
2152 }
2153
2154 ndev->needed_headroom = local->tx_headroom +
2155 4*6 /* four MAC addresses */
2156 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2157 + 6 /* mesh */
2158 + 8 /* rfc1042/bridge tunnel */
2159 - ETH_HLEN /* ethernet hard_header_len */
2160 + IEEE80211_ENCRYPT_HEADROOM;
2161 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2162
2163 ret = dev_alloc_name(ndev, ndev->name);
2164 if (ret < 0) {
2165 ieee80211_if_free(ndev);
2166 free_netdev(ndev);
2167 return ret;
2168 }
2169
2170 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2171 if (is_valid_ether_addr(params->macaddr))
2172 eth_hw_addr_set(ndev, params->macaddr);
2173 else
2174 eth_hw_addr_set(ndev, ndev->perm_addr);
2175 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2176
2177 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2178 sdata = netdev_priv(ndev);
2179 ndev->ieee80211_ptr = &sdata->wdev;
2180 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2181 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2182 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2183
2184 if (txq_size) {
2185 txqi = netdev_priv(ndev) + size;
2186 ieee80211_txq_init(sdata, NULL, txqi, 0);
2187 }
2188
2189 sdata->dev = ndev;
2190 }
2191
2192 /* initialise type-independent data */
2193 sdata->wdev.wiphy = local->hw.wiphy;
2194
2195 ieee80211_sdata_init(local, sdata);
2196
2197 ieee80211_init_frag_cache(&sdata->frags);
2198
2199 INIT_LIST_HEAD(&sdata->key_list);
2200
2201 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2202 ieee80211_delayed_tailroom_dec);
2203
2204 for (i = 0; i < NUM_NL80211_BANDS; i++) {
2205 struct ieee80211_supported_band *sband;
2206 sband = local->hw.wiphy->bands[i];
2207 sdata->rc_rateidx_mask[i] =
2208 sband ? (1 << sband->n_bitrates) - 1 : 0;
2209 if (sband) {
2210 __le16 cap;
2211 u16 *vht_rate_mask;
2212
2213 memcpy(sdata->rc_rateidx_mcs_mask[i],
2214 sband->ht_cap.mcs.rx_mask,
2215 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2216
2217 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2218 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2219 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2220 } else {
2221 memset(sdata->rc_rateidx_mcs_mask[i], 0,
2222 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2223 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2224 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2225 }
2226 }
2227
2228 ieee80211_set_default_queues(sdata);
2229
2230 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2231 sdata->deflink.user_power_level = local->user_power_level;
2232
2233 /* setup type-dependent data */
2234 ieee80211_setup_sdata(sdata, type);
2235
2236 if (ndev) {
2237 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2238 if (type == NL80211_IFTYPE_STATION)
2239 sdata->u.mgd.use_4addr = params->use_4addr;
2240
2241 ndev->features |= local->hw.netdev_features;
2242 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2243 ndev->hw_features |= ndev->features &
2244 MAC80211_SUPPORTED_FEATURES_TX;
2245
2246 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2247
2248 /* MTU range is normally 256 - 2304, where the upper limit is
2249 * the maximum MSDU size. Monitor interfaces send and receive
2250 * MPDU and A-MSDU frames which may be much larger so we do
2251 * not impose an upper limit in that case.
2252 */
2253 ndev->min_mtu = 256;
2254 if (type == NL80211_IFTYPE_MONITOR)
2255 ndev->max_mtu = 0;
2256 else
2257 ndev->max_mtu = local->hw.max_mtu;
2258
2259 ret = cfg80211_register_netdevice(ndev);
2260 if (ret) {
2261 free_netdev(ndev);
2262 return ret;
2263 }
2264 }
2265
2266 mutex_lock(&local->iflist_mtx);
2267 list_add_tail_rcu(&sdata->list, &local->interfaces);
2268 mutex_unlock(&local->iflist_mtx);
2269
2270 if (new_wdev)
2271 *new_wdev = &sdata->wdev;
2272
2273 return 0;
2274 }
2275
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2276 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2277 {
2278 ASSERT_RTNL();
2279
2280 mutex_lock(&sdata->local->iflist_mtx);
2281 list_del_rcu(&sdata->list);
2282 mutex_unlock(&sdata->local->iflist_mtx);
2283
2284 if (sdata->vif.txq)
2285 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2286
2287 synchronize_rcu();
2288
2289 cfg80211_unregister_wdev(&sdata->wdev);
2290
2291 if (!sdata->dev) {
2292 ieee80211_teardown_sdata(sdata);
2293 kfree(sdata);
2294 }
2295 }
2296
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2297 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2298 {
2299 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2300 return;
2301 ieee80211_do_stop(sdata, true);
2302 }
2303
ieee80211_remove_interfaces(struct ieee80211_local * local)2304 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2305 {
2306 struct ieee80211_sub_if_data *sdata, *tmp;
2307 LIST_HEAD(unreg_list);
2308 LIST_HEAD(wdev_list);
2309
2310 ASSERT_RTNL();
2311
2312 /* Before destroying the interfaces, make sure they're all stopped so
2313 * that the hardware is stopped. Otherwise, the driver might still be
2314 * iterating the interfaces during the shutdown, e.g. from a worker
2315 * or from RX processing or similar, and if it does so (using atomic
2316 * iteration) while we're manipulating the list, the iteration will
2317 * crash.
2318 *
2319 * After this, the hardware should be stopped and the driver should
2320 * have stopped all of its activities, so that we can do RCU-unaware
2321 * manipulations of the interface list below.
2322 */
2323 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2324
2325 WARN(local->open_count, "%s: open count remains %d\n",
2326 wiphy_name(local->hw.wiphy), local->open_count);
2327
2328 ieee80211_txq_teardown_flows(local);
2329
2330 mutex_lock(&local->iflist_mtx);
2331 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2332 list_del(&sdata->list);
2333
2334 if (sdata->dev)
2335 unregister_netdevice_queue(sdata->dev, &unreg_list);
2336 else
2337 list_add(&sdata->list, &wdev_list);
2338 }
2339 mutex_unlock(&local->iflist_mtx);
2340
2341 unregister_netdevice_many(&unreg_list);
2342
2343 wiphy_lock(local->hw.wiphy);
2344 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2345 list_del(&sdata->list);
2346 cfg80211_unregister_wdev(&sdata->wdev);
2347 kfree(sdata);
2348 }
2349 wiphy_unlock(local->hw.wiphy);
2350 }
2351
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2352 static int netdev_notify(struct notifier_block *nb,
2353 unsigned long state, void *ptr)
2354 {
2355 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2356 struct ieee80211_sub_if_data *sdata;
2357
2358 if (state != NETDEV_CHANGENAME)
2359 return NOTIFY_DONE;
2360
2361 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2362 return NOTIFY_DONE;
2363
2364 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2365 return NOTIFY_DONE;
2366
2367 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2368 memcpy(sdata->name, dev->name, IFNAMSIZ);
2369 ieee80211_debugfs_rename_netdev(sdata);
2370
2371 return NOTIFY_OK;
2372 }
2373
2374 static struct notifier_block mac80211_netdev_notifier = {
2375 .notifier_call = netdev_notify,
2376 };
2377
ieee80211_iface_init(void)2378 int ieee80211_iface_init(void)
2379 {
2380 return register_netdevice_notifier(&mac80211_netdev_notifier);
2381 }
2382
ieee80211_iface_exit(void)2383 void ieee80211_iface_exit(void)
2384 {
2385 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2386 }
2387
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2388 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2389 {
2390 if (sdata->vif.type == NL80211_IFTYPE_AP)
2391 atomic_inc(&sdata->u.ap.num_mcast_sta);
2392 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2393 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2394 }
2395
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2396 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2397 {
2398 if (sdata->vif.type == NL80211_IFTYPE_AP)
2399 atomic_dec(&sdata->u.ap.num_mcast_sta);
2400 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2401 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2402 }
2403
