1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Interface handling
4 *
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright (c) 2016 Intel Deutschland GmbH
11 * Copyright (C) 2018-2021 Intel Corporation
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) 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 iflist_mtx or RCU.
43 */
44
45 static void ieee80211_iface_work(struct work_struct *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.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->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
63 power = min(power, sdata->user_power_level);
64
65 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
66 power = min(power, sdata->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_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
83 }
84
__ieee80211_idle_off(struct ieee80211_local * local)85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
86 {
87 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
88 return 0;
89
90 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
91 return IEEE80211_CONF_CHANGE_IDLE;
92 }
93
__ieee80211_idle_on(struct ieee80211_local * local)94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
95 {
96 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
97 return 0;
98
99 ieee80211_flush_queues(local, NULL, false);
100
101 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
102 return IEEE80211_CONF_CHANGE_IDLE;
103 }
104
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
106 bool force_active)
107 {
108 bool working, scanning, active;
109 unsigned int led_trig_start = 0, led_trig_stop = 0;
110
111 lockdep_assert_held(&local->mtx);
112
113 active = force_active ||
114 !list_empty(&local->chanctx_list) ||
115 local->monitors;
116
117 working = !local->ops->remain_on_channel &&
118 !list_empty(&local->roc_list);
119
120 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
121 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
122
123 if (working || scanning)
124 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125 else
126 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127
128 if (active)
129 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130 else
131 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132
133 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
134
135 if (working || scanning || active)
136 return __ieee80211_idle_off(local);
137 return __ieee80211_idle_on(local);
138 }
139
ieee80211_idle_off(struct ieee80211_local * local)140 u32 ieee80211_idle_off(struct ieee80211_local *local)
141 {
142 return __ieee80211_recalc_idle(local, true);
143 }
144
ieee80211_recalc_idle(struct ieee80211_local * local)145 void ieee80211_recalc_idle(struct ieee80211_local *local)
146 {
147 u32 change = __ieee80211_recalc_idle(local, false);
148 if (change)
149 ieee80211_hw_config(local, change);
150 }
151
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
153 bool check_dup)
154 {
155 struct ieee80211_local *local = sdata->local;
156 struct ieee80211_sub_if_data *iter;
157 u64 new, mask, tmp;
158 u8 *m;
159 int ret = 0;
160
161 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
162 return 0;
163
164 m = addr;
165 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
166 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
167 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
168
169 m = local->hw.wiphy->addr_mask;
170 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
171 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
172 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
173
174 if (!check_dup)
175 return ret;
176
177 mutex_lock(&local->iflist_mtx);
178 list_for_each_entry(iter, &local->interfaces, list) {
179 if (iter == sdata)
180 continue;
181
182 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
183 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
184 continue;
185
186 m = iter->vif.addr;
187 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
188 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
189 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
190
191 if ((new & ~mask) != (tmp & ~mask)) {
192 ret = -EINVAL;
193 break;
194 }
195 }
196 mutex_unlock(&local->iflist_mtx);
197
198 return ret;
199 }
200
ieee80211_change_mac(struct net_device * dev,void * addr)201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
202 {
203 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
204 struct sockaddr *sa = addr;
205 bool check_dup = true;
206 int ret;
207
208 if (ieee80211_sdata_running(sdata))
209 return -EBUSY;
210
211 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
212 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
213 check_dup = false;
214
215 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
216 if (ret)
217 return ret;
218
219 ret = eth_mac_addr(dev, sa);
220
221 if (ret == 0)
222 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
223
224 return ret;
225 }
226
identical_mac_addr_allowed(int type1,int type2)227 static inline int identical_mac_addr_allowed(int type1, int type2)
228 {
229 return type1 == NL80211_IFTYPE_MONITOR ||
230 type2 == NL80211_IFTYPE_MONITOR ||
231 type1 == NL80211_IFTYPE_P2P_DEVICE ||
232 type2 == NL80211_IFTYPE_P2P_DEVICE ||
233 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
234 (type1 == NL80211_IFTYPE_WDS &&
235 (type2 == NL80211_IFTYPE_WDS ||
236 type2 == NL80211_IFTYPE_AP)) ||
237 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
238 (type1 == NL80211_IFTYPE_AP_VLAN &&
239 (type2 == NL80211_IFTYPE_AP ||
240 type2 == NL80211_IFTYPE_AP_VLAN));
241 }
242
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
244 enum nl80211_iftype iftype)
245 {
246 struct ieee80211_local *local = sdata->local;
247 struct ieee80211_sub_if_data *nsdata;
248 int ret;
249
250 ASSERT_RTNL();
251
252 /* we hold the RTNL here so can safely walk the list */
253 list_for_each_entry(nsdata, &local->interfaces, list) {
254 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
255 /*
256 * Only OCB and monitor mode may coexist
257 */
258 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
259 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
260 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
261 nsdata->vif.type == NL80211_IFTYPE_OCB))
262 return -EBUSY;
263
264 /*
265 * Allow only a single IBSS interface to be up at any
266 * time. This is restricted because beacon distribution
267 * cannot work properly if both are in the same IBSS.
268 *
269 * To remove this restriction we'd have to disallow them
270 * from setting the same SSID on different IBSS interfaces
271 * belonging to the same hardware. Then, however, we're
272 * faced with having to adopt two different TSF timers...
273 */
274 if (iftype == NL80211_IFTYPE_ADHOC &&
275 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276 return -EBUSY;
277 /*
278 * will not add another interface while any channel
279 * switch is active.
280 */
281 if (nsdata->vif.csa_active)
282 return -EBUSY;
283
284 /*
285 * The remaining checks are only performed for interfaces
286 * with the same MAC address.
287 */
288 if (!ether_addr_equal(sdata->vif.addr,
289 nsdata->vif.addr))
290 continue;
291
292 /*
293 * check whether it may have the same address
294 */
295 if (!identical_mac_addr_allowed(iftype,
296 nsdata->vif.type))
297 return -ENOTUNIQ;
298
299 /*
300 * can only add VLANs to enabled APs
301 */
302 if (iftype == NL80211_IFTYPE_AP_VLAN &&
303 nsdata->vif.type == NL80211_IFTYPE_AP)
304 sdata->bss = &nsdata->u.ap;
305 }
306 }
307
308 mutex_lock(&local->chanctx_mtx);
309 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
310 mutex_unlock(&local->chanctx_mtx);
311 return ret;
312 }
313
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
315 enum nl80211_iftype iftype)
316 {
317 int n_queues = sdata->local->hw.queues;
318 int i;
319
320 if (iftype == NL80211_IFTYPE_NAN)
321 return 0;
322
323 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
324 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
325 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
326 IEEE80211_INVAL_HW_QUEUE))
327 return -EINVAL;
328 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
329 n_queues))
330 return -EINVAL;
331 }
332 }
333
334 if ((iftype != NL80211_IFTYPE_AP &&
335 iftype != NL80211_IFTYPE_P2P_GO &&
336 iftype != NL80211_IFTYPE_MESH_POINT) ||
337 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
338 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
339 return 0;
340 }
341
342 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
343 return -EINVAL;
344
345 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
346 return -EINVAL;
347
348 return 0;
349 }
350
ieee80211_open(struct net_device * dev)351 static int ieee80211_open(struct net_device *dev)
352 {
353 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
354 int err;
355
356 /* fail early if user set an invalid address */
357 if (!is_valid_ether_addr(dev->dev_addr))
358 return -EADDRNOTAVAIL;
359
360 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
361 if (err)
362 return err;
363
364 return ieee80211_do_open(&sdata->wdev, true);
365 }
366
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)367 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
368 bool going_down)
369 {
370 struct ieee80211_local *local = sdata->local;
371 unsigned long flags;
372 struct sk_buff *skb, *tmp;
373 u32 hw_reconf_flags = 0;
374 int i, flushed;
375 struct ps_data *ps;
376 struct cfg80211_chan_def chandef;
377 bool cancel_scan;
378 struct cfg80211_nan_func *func;
379
380 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
381
382 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
383 if (cancel_scan)
384 ieee80211_scan_cancel(local);
385
386 /*
387 * Stop TX on this interface first.
388 */
389 if (sdata->dev)
390 netif_tx_stop_all_queues(sdata->dev);
391
392 ieee80211_roc_purge(local, sdata);
393
394 switch (sdata->vif.type) {
395 case NL80211_IFTYPE_STATION:
396 ieee80211_mgd_stop(sdata);
397 break;
398 case NL80211_IFTYPE_ADHOC:
399 ieee80211_ibss_stop(sdata);
400 break;
401 case NL80211_IFTYPE_MONITOR:
402 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
403 break;
404 list_del_rcu(&sdata->u.mntr.list);
405 break;
406 default:
407 break;
408 }
409
410 /*
411 * Remove all stations associated with this interface.
412 *
413 * This must be done before calling ops->remove_interface()
414 * because otherwise we can later invoke ops->sta_notify()
415 * whenever the STAs are removed, and that invalidates driver
416 * assumptions about always getting a vif pointer that is valid
417 * (because if we remove a STA after ops->remove_interface()
418 * the driver will have removed the vif info already!)
419 *
420 * In WDS mode a station must exist here and be flushed, for
421 * AP_VLANs stations may exist since there's nothing else that
422 * would have removed them, but in other modes there shouldn't
423 * be any stations.
424 */
425 flushed = sta_info_flush(sdata);
426 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
427 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
428 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
429
430 /* don't count this interface for allmulti while it is down */
431 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
432 atomic_dec(&local->iff_allmultis);
433
434 if (sdata->vif.type == NL80211_IFTYPE_AP) {
435 local->fif_pspoll--;
436 local->fif_probe_req--;
437 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
438 local->fif_probe_req--;
439 }
440
441 if (sdata->dev) {
442 netif_addr_lock_bh(sdata->dev);
443 spin_lock_bh(&local->filter_lock);
444 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
445 sdata->dev->addr_len);
446 spin_unlock_bh(&local->filter_lock);
447 netif_addr_unlock_bh(sdata->dev);
448 }
449
450 del_timer_sync(&local->dynamic_ps_timer);
451 cancel_work_sync(&local->dynamic_ps_enable_work);
452
453 cancel_work_sync(&sdata->recalc_smps);
454 sdata_lock(sdata);
455 mutex_lock(&local->mtx);
456 sdata->vif.csa_active = false;
457 if (sdata->vif.type == NL80211_IFTYPE_STATION)
458 sdata->u.mgd.csa_waiting_bcn = false;
459 if (sdata->csa_block_tx) {
460 ieee80211_wake_vif_queues(local, sdata,
461 IEEE80211_QUEUE_STOP_REASON_CSA);
462 sdata->csa_block_tx = false;
463 }
464 mutex_unlock(&local->mtx);
465 sdata_unlock(sdata);
466
467 cancel_work_sync(&sdata->csa_finalize_work);
468
469 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
470
471 if (sdata->wdev.cac_started) {
472 chandef = sdata->vif.bss_conf.chandef;
473 WARN_ON(local->suspended);
474 mutex_lock(&local->mtx);
475 ieee80211_vif_release_channel(sdata);
476 mutex_unlock(&local->mtx);
477 cfg80211_cac_event(sdata->dev, &chandef,
478 NL80211_RADAR_CAC_ABORTED,
479 GFP_KERNEL);
480 }
481
482 /* APs need special treatment */
483 if (sdata->vif.type == NL80211_IFTYPE_AP) {
484 struct ieee80211_sub_if_data *vlan, *tmpsdata;
485
486 /* down all dependent devices, that is VLANs */
487 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
488 u.vlan.list)
489 dev_close(vlan->dev);
490 WARN_ON(!list_empty(&sdata->u.ap.vlans));
491 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
492 /* remove all packets in parent bc_buf pointing to this dev */
493 ps = &sdata->bss->ps;
494
495 spin_lock_irqsave(&ps->bc_buf.lock, flags);
496 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
497 if (skb->dev == sdata->dev) {
498 __skb_unlink(skb, &ps->bc_buf);
499 local->total_ps_buffered--;
500 ieee80211_free_txskb(&local->hw, skb);
501 }
502 }
503 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
504 }
505
506 if (going_down)
507 local->open_count--;
508
509 switch (sdata->vif.type) {
510 case NL80211_IFTYPE_AP_VLAN:
511 mutex_lock(&local->mtx);
512 list_del(&sdata->u.vlan.list);
513 mutex_unlock(&local->mtx);
514 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
515 /* see comment in the default case below */
516 ieee80211_free_keys(sdata, true);
517 /* no need to tell driver */
518 break;
519 case NL80211_IFTYPE_MONITOR:
520 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
521 local->cooked_mntrs--;
522 break;
523 }
524
525 local->monitors--;
526 if (local->monitors == 0) {
527 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
528 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
529 }
530
531 ieee80211_adjust_monitor_flags(sdata, -1);
532 break;
533 case NL80211_IFTYPE_NAN:
534 /* clean all the functions */
535 spin_lock_bh(&sdata->u.nan.func_lock);
536
537 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
538 idr_remove(&sdata->u.nan.function_inst_ids, i);
539 cfg80211_free_nan_func(func);
540 }
541 idr_destroy(&sdata->u.nan.function_inst_ids);
542
543 spin_unlock_bh(&sdata->u.nan.func_lock);
544 break;
545 case NL80211_IFTYPE_P2P_DEVICE:
546 /* relies on synchronize_rcu() below */
547 RCU_INIT_POINTER(local->p2p_sdata, NULL);
548 fallthrough;
549 default:
550 cancel_work_sync(&sdata->work);
551 /*
552 * When we get here, the interface is marked down.
553 * Free the remaining keys, if there are any
554 * (which can happen in AP mode if userspace sets
555 * keys before the interface is operating, and maybe
556 * also in WDS mode)
557 *
558 * Force the key freeing to always synchronize_net()
559 * to wait for the RX path in case it is using this
560 * interface enqueuing frames at this very time on
561 * another CPU.
562 */
563 ieee80211_free_keys(sdata, true);
564 skb_queue_purge(&sdata->skb_queue);
565 }
566
567 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
568 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
569 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
570 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
571 if (info->control.vif == &sdata->vif) {
572 __skb_unlink(skb, &local->pending[i]);
573 ieee80211_free_txskb(&local->hw, skb);
574 }
575 }
576 }
577 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
578
579 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
580 ieee80211_txq_remove_vlan(local, sdata);
581
582 sdata->bss = NULL;
583
584 if (local->open_count == 0)
585 ieee80211_clear_tx_pending(local);
586
587 sdata->vif.bss_conf.beacon_int = 0;
588
589 /*
590 * If the interface goes down while suspended, presumably because
591 * the device was unplugged and that happens before our resume,
592 * then the driver is already unconfigured and the remainder of
593 * this function isn't needed.
594 * XXX: what about WoWLAN? If the device has software state, e.g.
595 * memory allocated, it might expect teardown commands from
596 * mac80211 here?
597 */
598 if (local->suspended) {
599 WARN_ON(local->wowlan);
600 WARN_ON(rtnl_dereference(local->monitor_sdata));
601 return;
602 }
603
604 switch (sdata->vif.type) {
605 case NL80211_IFTYPE_AP_VLAN:
606 break;
607 case NL80211_IFTYPE_MONITOR:
608 if (local->monitors == 0)
609 ieee80211_del_virtual_monitor(local);
610
611 mutex_lock(&local->mtx);
612 ieee80211_recalc_idle(local);
613 mutex_unlock(&local->mtx);
614
615 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
616 break;
617
618 fallthrough;
619 default:
620 if (going_down)
621 drv_remove_interface(local, sdata);
622 }
623
624 ieee80211_recalc_ps(local);
625
626 if (cancel_scan)
627 flush_delayed_work(&local->scan_work);
628
629 if (local->open_count == 0) {
630 ieee80211_stop_device(local);
631
632 /* no reconfiguring after stop! */
633 return;
634 }
635
636 /* do after stop to avoid reconfiguring when we stop anyway */
637 ieee80211_configure_filter(local);
638 ieee80211_hw_config(local, hw_reconf_flags);
639
640 if (local->monitors == local->open_count)
641 ieee80211_add_virtual_monitor(local);
642 }
643
ieee80211_stop(struct net_device * dev)644 static int ieee80211_stop(struct net_device *dev)
645 {
646 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
647
648 ieee80211_do_stop(sdata, true);
649
650 return 0;
651 }
652
ieee80211_set_multicast_list(struct net_device * dev)653 static void ieee80211_set_multicast_list(struct net_device *dev)
654 {
655 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
656 struct ieee80211_local *local = sdata->local;
657 int allmulti, sdata_allmulti;
658
659 allmulti = !!(dev->flags & IFF_ALLMULTI);
660 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
661
662 if (allmulti != sdata_allmulti) {
663 if (dev->flags & IFF_ALLMULTI)
664 atomic_inc(&local->iff_allmultis);
665 else
666 atomic_dec(&local->iff_allmultis);
667 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
668 }
669
670 spin_lock_bh(&local->filter_lock);
671 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
672 spin_unlock_bh(&local->filter_lock);
673 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
674 }
675
676 /*
677 * Called when the netdev is removed or, by the code below, before
678 * the interface type changes.
679 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)680 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
681 {
682 /* free extra data */
683 ieee80211_free_keys(sdata, false);
684
685 ieee80211_debugfs_remove_netdev(sdata);
686
687 ieee80211_destroy_frag_cache(&sdata->frags);
688
689 if (ieee80211_vif_is_mesh(&sdata->vif))
690 ieee80211_mesh_teardown_sdata(sdata);
691 }
692
ieee80211_uninit(struct net_device * dev)693 static void ieee80211_uninit(struct net_device *dev)
694 {
695 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
696 }
697
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)698 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
699 struct sk_buff *skb,
700 struct net_device *sb_dev)
701 {
702 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
703 }
704
705 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)706 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
707 {
708 dev_fetch_sw_netstats(stats, dev->tstats);
709 }
710
711 static const struct net_device_ops ieee80211_dataif_ops = {
712 .ndo_open = ieee80211_open,
713 .ndo_stop = ieee80211_stop,
714 .ndo_uninit = ieee80211_uninit,
715 .ndo_start_xmit = ieee80211_subif_start_xmit,
716 .ndo_set_rx_mode = ieee80211_set_multicast_list,
717 .ndo_set_mac_address = ieee80211_change_mac,
718 .ndo_select_queue = ieee80211_netdev_select_queue,
719 .ndo_get_stats64 = ieee80211_get_stats64,
720 };
721
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)722 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
723 struct sk_buff *skb,
724 struct net_device *sb_dev)
725 {
726 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
727 struct ieee80211_local *local = sdata->local;
728 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
729 struct ieee80211_hdr *hdr;
730 int len_rthdr;
731
732 if (local->hw.queues < IEEE80211_NUM_ACS)
733 return 0;
734
735 /* reset flags and info before parsing radiotap header */
736 memset(info, 0, sizeof(*info));
737
738 if (!ieee80211_parse_tx_radiotap(skb, dev))
739 return 0; /* doesn't matter, frame will be dropped */
740
741 len_rthdr = ieee80211_get_radiotap_len(skb->data);
742 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
743 if (skb->len < len_rthdr + 2 ||
744 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
745 return 0; /* doesn't matter, frame will be dropped */
746
747 return ieee80211_select_queue_80211(sdata, skb, hdr);
748 }
749
750 static const struct net_device_ops ieee80211_monitorif_ops = {
751 .ndo_open = ieee80211_open,
752 .ndo_stop = ieee80211_stop,
753 .ndo_uninit = ieee80211_uninit,
754 .ndo_start_xmit = ieee80211_monitor_start_xmit,
755 .ndo_set_rx_mode = ieee80211_set_multicast_list,
756 .ndo_set_mac_address = ieee80211_change_mac,
757 .ndo_select_queue = ieee80211_monitor_select_queue,
758 .ndo_get_stats64 = ieee80211_get_stats64,
759 };
760
761 static const struct net_device_ops ieee80211_dataif_8023_ops = {
762 .ndo_open = ieee80211_open,
763 .ndo_stop = ieee80211_stop,
764 .ndo_uninit = ieee80211_uninit,
765 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
766 .ndo_set_rx_mode = ieee80211_set_multicast_list,
767 .ndo_set_mac_address = ieee80211_change_mac,
768 .ndo_select_queue = ieee80211_netdev_select_queue,
769 .ndo_get_stats64 = ieee80211_get_stats64,
770 };
771
ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)772 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
773 {
774 switch (iftype) {
775 /* P2P GO and client are mapped to AP/STATION types */
776 case NL80211_IFTYPE_AP:
777 case NL80211_IFTYPE_STATION:
778 return true;
779 default:
780 return false;
781 }
782 }
783
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)784 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
785 {
786 struct ieee80211_local *local = sdata->local;
787 u32 flags;
788
789 flags = sdata->vif.offload_flags;
790
791 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
792 ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
793 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
794
795 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
796 local->hw.wiphy->frag_threshold != (u32)-1)
797 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
798
799 if (local->monitors)
800 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
801 } else {
802 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
803 }
804
805 if (sdata->vif.offload_flags == flags)
806 return false;
807
808 sdata->vif.offload_flags = flags;
809 return true;
810 }
811
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)812 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
813 {
814 struct ieee80211_local *local = sdata->local;
815 struct ieee80211_sub_if_data *bss = sdata;
816 bool enabled;
817
818 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
819 if (!sdata->bss)
820 return;
821
822 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
823 }
824
825 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
826 !ieee80211_iftype_supports_encap_offload(bss->vif.type))
827 return;
828
829 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
830 if (sdata->wdev.use_4addr &&
831 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
832 enabled = false;
833
834 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
835 &ieee80211_dataif_ops;
836 }
837
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)838 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
839 {
840 struct ieee80211_local *local = sdata->local;
841 struct ieee80211_sub_if_data *vsdata;
842
843 if (ieee80211_set_sdata_offload_flags(sdata)) {
844 drv_update_vif_offload(local, sdata);
845 ieee80211_set_vif_encap_ops(sdata);
846 }
847
848 list_for_each_entry(vsdata, &local->interfaces, list) {
849 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
850 vsdata->bss != &sdata->u.ap)
851 continue;
852
853 ieee80211_set_vif_encap_ops(vsdata);
854 }
855 }
856
ieee80211_recalc_offload(struct ieee80211_local * local)857 void ieee80211_recalc_offload(struct ieee80211_local *local)
858 {
859 struct ieee80211_sub_if_data *sdata;
860
861 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
862 return;
863
864 mutex_lock(&local->iflist_mtx);
865
866 list_for_each_entry(sdata, &local->interfaces, list) {
867 if (!ieee80211_sdata_running(sdata))
868 continue;
869
870 ieee80211_recalc_sdata_offload(sdata);
871 }
872
873 mutex_unlock(&local->iflist_mtx);
874 }
875
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)876 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
877 const int offset)
878 {
879 struct ieee80211_local *local = sdata->local;
880 u32 flags = sdata->u.mntr.flags;
881
882 #define ADJUST(_f, _s) do { \
883 if (flags & MONITOR_FLAG_##_f) \
884 local->fif_##_s += offset; \
885 } while (0)
886
887 ADJUST(FCSFAIL, fcsfail);
888 ADJUST(PLCPFAIL, plcpfail);
889 ADJUST(CONTROL, control);
890 ADJUST(CONTROL, pspoll);
891 ADJUST(OTHER_BSS, other_bss);
892
893 #undef ADJUST
894 }
895
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)896 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
897 {
898 struct ieee80211_local *local = sdata->local;
899 int i;
900
901 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
902 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
903 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
904 else if (local->hw.queues >= IEEE80211_NUM_ACS)
905 sdata->vif.hw_queue[i] = i;
906 else
907 sdata->vif.hw_queue[i] = 0;
908 }
909 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
910 }
911
ieee80211_add_virtual_monitor(struct ieee80211_local * local)912 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
913 {
914 struct ieee80211_sub_if_data *sdata;
915 int ret;
916
917 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
918 return 0;
919
920 ASSERT_RTNL();
921
922 if (local->monitor_sdata)
923 return 0;
924
925 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
926 if (!sdata)
927 return -ENOMEM;
928
929 /* set up data */
930 sdata->local = local;
931 sdata->vif.type = NL80211_IFTYPE_MONITOR;
932 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
933 wiphy_name(local->hw.wiphy));
934 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
935
936 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
937
938 ieee80211_set_default_queues(sdata);
939
940 ret = drv_add_interface(local, sdata);
941 if (WARN_ON(ret)) {
942 /* ok .. stupid driver, it asked for this! */
943 kfree(sdata);
944 return ret;
945 }
946
947 set_bit(SDATA_STATE_RUNNING, &sdata->state);
948
949 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
950 if (ret) {
951 kfree(sdata);
952 return ret;
953 }
954
955 mutex_lock(&local->iflist_mtx);
956 rcu_assign_pointer(local->monitor_sdata, sdata);
957 mutex_unlock(&local->iflist_mtx);
958
959 mutex_lock(&local->mtx);
960 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
961 IEEE80211_CHANCTX_EXCLUSIVE);
962 mutex_unlock(&local->mtx);
963 if (ret) {
964 mutex_lock(&local->iflist_mtx);
965 RCU_INIT_POINTER(local->monitor_sdata, NULL);
966 mutex_unlock(&local->iflist_mtx);
967 synchronize_net();
968 drv_remove_interface(local, sdata);
969 kfree(sdata);
970 return ret;
971 }
972
973 skb_queue_head_init(&sdata->skb_queue);
974 INIT_WORK(&sdata->work, ieee80211_iface_work);
975
976 return 0;
977 }
978
ieee80211_del_virtual_monitor(struct ieee80211_local * local)979 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
980 {
981 struct ieee80211_sub_if_data *sdata;
982
983 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
984 return;
985
986 ASSERT_RTNL();
987
988 mutex_lock(&local->iflist_mtx);
989
990 sdata = rcu_dereference_protected(local->monitor_sdata,
991 lockdep_is_held(&local->iflist_mtx));
992 if (!sdata) {
993 mutex_unlock(&local->iflist_mtx);
994 return;
995 }
996
997 RCU_INIT_POINTER(local->monitor_sdata, NULL);
998 mutex_unlock(&local->iflist_mtx);
999
1000 synchronize_net();
1001
1002 mutex_lock(&local->mtx);
1003 ieee80211_vif_release_channel(sdata);
1004 mutex_unlock(&local->mtx);
1005
1006 drv_remove_interface(local, sdata);
1007
1008 kfree(sdata);
1009 }
1010
1011 /*
1012 * NOTE: Be very careful when changing this function, it must NOT return
1013 * an error on interface type changes that have been pre-checked, so most
1014 * checks should be in ieee80211_check_concurrent_iface.
1015 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1016 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1017 {
1018 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1019 struct net_device *dev = wdev->netdev;
1020 struct ieee80211_local *local = sdata->local;
1021 struct sta_info *sta;
1022 u32 changed = 0;
1023 int res;
1024 u32 hw_reconf_flags = 0;
1025
1026 switch (sdata->vif.type) {
1027 case NL80211_IFTYPE_WDS:
1028 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
1029 return -ENOLINK;
1030 break;
1031 case NL80211_IFTYPE_AP_VLAN: {
1032 struct ieee80211_sub_if_data *master;
1033
1034 if (!sdata->bss)
1035 return -ENOLINK;
1036
1037 mutex_lock(&local->mtx);
1038 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1039 mutex_unlock(&local->mtx);
1040
1041 master = container_of(sdata->bss,
1042 struct ieee80211_sub_if_data, u.ap);
1043 sdata->control_port_protocol =
1044 master->control_port_protocol;
1045 sdata->control_port_no_encrypt =
1046 master->control_port_no_encrypt;
1047 sdata->control_port_over_nl80211 =
1048 master->control_port_over_nl80211;
1049 sdata->control_port_no_preauth =
1050 master->control_port_no_preauth;
1051 sdata->vif.cab_queue = master->vif.cab_queue;
1052 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1053 sizeof(sdata->vif.hw_queue));
1054 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1055
1056 mutex_lock(&local->key_mtx);
1057 sdata->crypto_tx_tailroom_needed_cnt +=
1058 master->crypto_tx_tailroom_needed_cnt;
1059 mutex_unlock(&local->key_mtx);
1060
1061 break;
1062 }
1063 case NL80211_IFTYPE_AP:
1064 sdata->bss = &sdata->u.ap;
1065 break;
1066 case NL80211_IFTYPE_MESH_POINT:
1067 case NL80211_IFTYPE_STATION:
1068 case NL80211_IFTYPE_MONITOR:
1069 case NL80211_IFTYPE_ADHOC:
1070 case NL80211_IFTYPE_P2P_DEVICE:
1071 case NL80211_IFTYPE_OCB:
1072 case NL80211_IFTYPE_NAN:
1073 /* no special treatment */
1074 break;
1075 case NL80211_IFTYPE_UNSPECIFIED:
1076 case NUM_NL80211_IFTYPES:
1077 case NL80211_IFTYPE_P2P_CLIENT:
1078 case NL80211_IFTYPE_P2P_GO:
1079 /* cannot happen */
1080 WARN_ON(1);
1081 break;
1082 }
1083
1084 if (local->open_count == 0) {
1085 res = drv_start(local);
1086 if (res)
1087 goto err_del_bss;
1088 /* we're brought up, everything changes */
1089 hw_reconf_flags = ~0;
1090 ieee80211_led_radio(local, true);
1091 ieee80211_mod_tpt_led_trig(local,
1092 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1093 }
1094
1095 /*
1096 * Copy the hopefully now-present MAC address to
1097 * this interface, if it has the special null one.
1098 */
1099 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1100 memcpy(dev->dev_addr,
1101 local->hw.wiphy->perm_addr,
1102 ETH_ALEN);
1103 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1104
1105 if (!is_valid_ether_addr(dev->dev_addr)) {
1106 res = -EADDRNOTAVAIL;
1107 goto err_stop;
1108 }
1109 }
1110
1111 switch (sdata->vif.type) {
1112 case NL80211_IFTYPE_AP_VLAN:
1113 /* no need to tell driver, but set carrier and chanctx */
1114 if (rtnl_dereference(sdata->bss->beacon)) {
1115 ieee80211_vif_vlan_copy_chanctx(sdata);
1116 netif_carrier_on(dev);
1117 ieee80211_set_vif_encap_ops(sdata);
1118 } else {
1119 netif_carrier_off(dev);
1120 }
1121 break;
1122 case NL80211_IFTYPE_MONITOR:
1123 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1124 local->cooked_mntrs++;
1125 break;
1126 }
1127
1128 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1129 res = drv_add_interface(local, sdata);
1130 if (res)
1131 goto err_stop;
1132 } else if (local->monitors == 0 && local->open_count == 0) {
1133 res = ieee80211_add_virtual_monitor(local);
1134 if (res)
1135 goto err_stop;
1136 }
1137
1138 /* must be before the call to ieee80211_configure_filter */
1139 local->monitors++;
1140 if (local->monitors == 1) {
1141 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1142 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1143 }
1144
1145 ieee80211_adjust_monitor_flags(sdata, 1);
1146 ieee80211_configure_filter(local);
1147 ieee80211_recalc_offload(local);
1148 mutex_lock(&local->mtx);
1149 ieee80211_recalc_idle(local);
1150 mutex_unlock(&local->mtx);
1151
1152 netif_carrier_on(dev);
1153 break;
1154 default:
1155 if (coming_up) {
1156 ieee80211_del_virtual_monitor(local);
1157 ieee80211_set_sdata_offload_flags(sdata);
1158
1159 res = drv_add_interface(local, sdata);
1160 if (res)
1161 goto err_stop;
1162
1163 ieee80211_set_vif_encap_ops(sdata);
1164 res = ieee80211_check_queues(sdata,
1165 ieee80211_vif_type_p2p(&sdata->vif));
1166 if (res)
1167 goto err_del_interface;
1168 }
1169
1170 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1171 local->fif_pspoll++;
1172 local->fif_probe_req++;
1173
1174 ieee80211_configure_filter(local);
1175 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1176 local->fif_probe_req++;
1177 }
1178
1179 if (sdata->vif.probe_req_reg)
1180 drv_config_iface_filter(local, sdata,
1181 FIF_PROBE_REQ,
1182 FIF_PROBE_REQ);
1183
1184 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1185 sdata->vif.type != NL80211_IFTYPE_NAN)
1186 changed |= ieee80211_reset_erp_info(sdata);
1187 ieee80211_bss_info_change_notify(sdata, changed);
1188
1189 switch (sdata->vif.type) {
1190 case NL80211_IFTYPE_STATION:
1191 case NL80211_IFTYPE_ADHOC:
1192 case NL80211_IFTYPE_AP:
1193 case NL80211_IFTYPE_MESH_POINT:
1194 case NL80211_IFTYPE_OCB:
1195 netif_carrier_off(dev);
1196 break;
1197 case NL80211_IFTYPE_WDS:
1198 case NL80211_IFTYPE_P2P_DEVICE:
1199 case NL80211_IFTYPE_NAN:
1200 break;
1201 default:
1202 /* not reached */
1203 WARN_ON(1);
1204 }
1205
1206 /*
1207 * Set default queue parameters so drivers don't
1208 * need to initialise the hardware if the hardware
1209 * doesn't start up with sane defaults.
1210 * Enable QoS for anything but station interfaces.
1211 */
1212 ieee80211_set_wmm_default(sdata, true,
1213 sdata->vif.type != NL80211_IFTYPE_STATION);
1214 }
1215
1216 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1217
1218 switch (sdata->vif.type) {
1219 case NL80211_IFTYPE_WDS:
1220 /* Create STA entry for the WDS peer */
1221 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
1222 GFP_KERNEL);
1223 if (!sta) {
1224 res = -ENOMEM;
1225 goto err_del_interface;
1226 }
1227
1228 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
1229 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
1230 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
1231
1232 res = sta_info_insert(sta);
1233 if (res) {
1234 /* STA has been freed */
1235 goto err_del_interface;
1236 }
1237
1238 rate_control_rate_init(sta);
1239 netif_carrier_on(dev);
1240 break;
1241 case NL80211_IFTYPE_P2P_DEVICE:
1242 rcu_assign_pointer(local->p2p_sdata, sdata);
1243 break;
1244 case NL80211_IFTYPE_MONITOR:
1245 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1246 break;
1247 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1248 break;
1249 default:
1250 break;
1251 }
1252
1253 /*
1254 * set_multicast_list will be invoked by the networking core
1255 * which will check whether any increments here were done in
1256 * error and sync them down to the hardware as filter flags.
1257 */
1258 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1259 atomic_inc(&local->iff_allmultis);
1260
1261 if (coming_up)
1262 local->open_count++;
1263
1264 if (hw_reconf_flags)
1265 ieee80211_hw_config(local, hw_reconf_flags);
1266
1267 ieee80211_recalc_ps(local);
1268
1269 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1270 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1271 local->ops->wake_tx_queue) {
1272 /* XXX: for AP_VLAN, actually track AP queues */
1273 if (dev)
1274 netif_tx_start_all_queues(dev);
1275 } else if (dev) {
1276 unsigned long flags;
1277 int n_acs = IEEE80211_NUM_ACS;
1278 int ac;
1279
1280 if (local->hw.queues < IEEE80211_NUM_ACS)
1281 n_acs = 1;
1282
1283 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1284 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1285 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1286 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1287 for (ac = 0; ac < n_acs; ac++) {
1288 int ac_queue = sdata->vif.hw_queue[ac];
1289
1290 if (local->queue_stop_reasons[ac_queue] == 0 &&
1291 skb_queue_empty(&local->pending[ac_queue]))
1292 netif_start_subqueue(dev, ac);
1293 }
1294 }
1295 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1296 }
1297
1298 return 0;
1299 err_del_interface:
1300 drv_remove_interface(local, sdata);
1301 err_stop:
1302 if (!local->open_count)
1303 drv_stop(local);
1304 err_del_bss:
1305 sdata->bss = NULL;
1306 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1307 mutex_lock(&local->mtx);
1308 list_del(&sdata->u.vlan.list);
1309 mutex_unlock(&local->mtx);
1310 }
1311 /* might already be clear but that doesn't matter */
1312 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1313 return res;
1314 }
1315
ieee80211_if_free(struct net_device * dev)1316 static void ieee80211_if_free(struct net_device *dev)
1317 {
1318 free_percpu(dev->tstats);
1319 }
1320
ieee80211_if_setup(struct net_device * dev)1321 static void ieee80211_if_setup(struct net_device *dev)
1322 {
1323 ether_setup(dev);
1324 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1325 dev->netdev_ops = &ieee80211_dataif_ops;
1326 dev->needs_free_netdev = true;
1327 dev->priv_destructor = ieee80211_if_free;
1328 }
1329
ieee80211_if_setup_no_queue(struct net_device * dev)1330 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1331 {
1332 ieee80211_if_setup(dev);
1333 dev->priv_flags |= IFF_NO_QUEUE;
1334 }
1335
ieee80211_iface_work(struct work_struct * work)1336 static void ieee80211_iface_work(struct work_struct *work)
1337 {
1338 struct ieee80211_sub_if_data *sdata =
1339 container_of(work, struct ieee80211_sub_if_data, work);
1340 struct ieee80211_local *local = sdata->local;
1341 struct sk_buff *skb;
1342 struct sta_info *sta;
1343
1344 if (!ieee80211_sdata_running(sdata))
1345 return;
1346
1347 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1348 return;
1349
1350 if (!ieee80211_can_run_worker(local))
1351 return;
1352
1353 /* first process frames */
1354 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1355 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1356
1357 if (ieee80211_is_action(mgmt->frame_control) &&
1358 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1359 int len = skb->len;
1360
1361 mutex_lock(&local->sta_mtx);
1362 sta = sta_info_get_bss(sdata, mgmt->sa);
1363 if (sta) {
1364 switch (mgmt->u.action.u.addba_req.action_code) {
1365 case WLAN_ACTION_ADDBA_REQ:
1366 ieee80211_process_addba_request(
1367 local, sta, mgmt, len);
1368 break;
1369 case WLAN_ACTION_ADDBA_RESP:
1370 ieee80211_process_addba_resp(local, sta,
1371 mgmt, len);
1372 break;
1373 case WLAN_ACTION_DELBA:
1374 ieee80211_process_delba(sdata, sta,
1375 mgmt, len);
1376 break;
1377 default:
1378 WARN_ON(1);
1379 break;
1380 }
1381 }
1382 mutex_unlock(&local->sta_mtx);
1383 } else if (ieee80211_is_action(mgmt->frame_control) &&
1384 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1385 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1386 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1387 struct ieee80211_rx_status *status;
1388 enum nl80211_band band;
1389 u8 opmode;
1390
1391 status = IEEE80211_SKB_RXCB(skb);
1392 band = status->band;
1393 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1394
1395 mutex_lock(&local->sta_mtx);
1396 sta = sta_info_get_bss(sdata, mgmt->sa);
1397
1398 if (sta)
1399 ieee80211_vht_handle_opmode(sdata, sta,
1400 opmode,
1401 band);
1402
1403 mutex_unlock(&local->sta_mtx);
1404 break;
1405 }
1406 case WLAN_VHT_ACTION_GROUPID_MGMT:
1407 ieee80211_process_mu_groups(sdata, mgmt);
1408 break;
1409 default:
1410 WARN_ON(1);
1411 break;
1412 }
1413 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1414 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1415 ieee80211_sta_rx_queued_ext(sdata, skb);
1416 else
1417 WARN_ON(1);
1418 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1419 struct ieee80211_hdr *hdr = (void *)mgmt;
1420 /*
1421 * So the frame isn't mgmt, but frame_control
1422 * is at the right place anyway, of course, so
1423 * the if statement is correct.
1424 *
1425 * Warn if we have other data frame types here,
1426 * they must not get here.
1427 */
1428 WARN_ON(hdr->frame_control &
1429 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1430 WARN_ON(!(hdr->seq_ctrl &
1431 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1432 /*
1433 * This was a fragment of a frame, received while
1434 * a block-ack session was active. That cannot be
1435 * right, so terminate the session.
1436 */
1437 mutex_lock(&local->sta_mtx);
1438 sta = sta_info_get_bss(sdata, mgmt->sa);
1439 if (sta) {
1440 u16 tid = ieee80211_get_tid(hdr);
1441
1442 __ieee80211_stop_rx_ba_session(
1443 sta, tid, WLAN_BACK_RECIPIENT,
1444 WLAN_REASON_QSTA_REQUIRE_SETUP,
1445 true);
1446 }
1447 mutex_unlock(&local->sta_mtx);
1448 } else switch (sdata->vif.type) {
1449 case NL80211_IFTYPE_STATION:
1450 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1451 break;
1452 case NL80211_IFTYPE_ADHOC:
1453 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1454 break;
1455 case NL80211_IFTYPE_MESH_POINT:
1456 if (!ieee80211_vif_is_mesh(&sdata->vif))
1457 break;
1458 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1459 break;
1460 default:
1461 WARN(1, "frame for unexpected interface type");
1462 break;
1463 }
1464
1465 kfree_skb(skb);
1466 }
1467
1468 /* then other type-dependent work */
1469 switch (sdata->vif.type) {
1470 case NL80211_IFTYPE_STATION:
1471 ieee80211_sta_work(sdata);
1472 break;
1473 case NL80211_IFTYPE_ADHOC:
1474 ieee80211_ibss_work(sdata);
1475 break;
1476 case NL80211_IFTYPE_MESH_POINT:
1477 if (!ieee80211_vif_is_mesh(&sdata->vif))
1478 break;
1479 ieee80211_mesh_work(sdata);
1480 break;
1481 case NL80211_IFTYPE_OCB:
1482 ieee80211_ocb_work(sdata);
1483 break;
1484 default:
1485 break;
1486 }
1487 }
1488
ieee80211_recalc_smps_work(struct work_struct * work)1489 static void ieee80211_recalc_smps_work(struct work_struct *work)
1490 {
1491 struct ieee80211_sub_if_data *sdata =
1492 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1493
1494 ieee80211_recalc_smps(sdata);
1495 }
1496
1497 /*
1498 * Helper function to initialise an interface to a specific type.
1499 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1500 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1501 enum nl80211_iftype type)
1502 {
1503 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1504 0xff, 0xff, 0xff};
1505
1506 /* clear type-dependent union */
1507 memset(&sdata->u, 0, sizeof(sdata->u));
1508
1509 /* and set some type-dependent values */
1510 sdata->vif.type = type;
1511 sdata->vif.p2p = false;
1512 sdata->wdev.iftype = type;
1513
1514 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1515 sdata->control_port_no_encrypt = false;
1516 sdata->control_port_over_nl80211 = false;
1517 sdata->control_port_no_preauth = false;
1518 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1519 sdata->vif.bss_conf.idle = true;
1520 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1521
1522 sdata->noack_map = 0;
1523
1524 /* only monitor/p2p-device differ */
1525 if (sdata->dev) {
1526 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1527 sdata->dev->type = ARPHRD_ETHER;
1528 }
1529
1530 skb_queue_head_init(&sdata->skb_queue);
1531 INIT_WORK(&sdata->work, ieee80211_iface_work);
1532 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1533 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1534 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1535 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1536
1537 switch (type) {
1538 case NL80211_IFTYPE_P2P_GO:
1539 type = NL80211_IFTYPE_AP;
1540 sdata->vif.type = type;
1541 sdata->vif.p2p = true;
1542 fallthrough;
1543 case NL80211_IFTYPE_AP:
1544 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1545 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1546 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1547 break;
1548 case NL80211_IFTYPE_P2P_CLIENT:
1549 type = NL80211_IFTYPE_STATION;
1550 sdata->vif.type = type;
1551 sdata->vif.p2p = true;
1552 fallthrough;
1553 case NL80211_IFTYPE_STATION:
1554 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1555 ieee80211_sta_setup_sdata(sdata);
1556 break;
1557 case NL80211_IFTYPE_OCB:
1558 sdata->vif.bss_conf.bssid = bssid_wildcard;
1559 ieee80211_ocb_setup_sdata(sdata);
1560 break;
1561 case NL80211_IFTYPE_ADHOC:
1562 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1563 ieee80211_ibss_setup_sdata(sdata);
1564 break;
1565 case NL80211_IFTYPE_MESH_POINT:
1566 if (ieee80211_vif_is_mesh(&sdata->vif))
1567 ieee80211_mesh_init_sdata(sdata);
1568 break;
1569 case NL80211_IFTYPE_MONITOR:
1570 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1571 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1572 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1573 MONITOR_FLAG_OTHER_BSS;
1574 break;
1575 case NL80211_IFTYPE_WDS:
1576 sdata->vif.bss_conf.bssid = NULL;
1577 break;
1578 case NL80211_IFTYPE_NAN:
1579 idr_init(&sdata->u.nan.function_inst_ids);
1580 spin_lock_init(&sdata->u.nan.func_lock);
1581 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1582 break;
1583 case NL80211_IFTYPE_AP_VLAN:
1584 case NL80211_IFTYPE_P2P_DEVICE:
1585 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1586 break;
1587 case NL80211_IFTYPE_UNSPECIFIED:
1588 case NUM_NL80211_IFTYPES:
1589 WARN_ON(1);
1590 break;
1591 }
1592
1593 ieee80211_debugfs_add_netdev(sdata);
1594 }
1595
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1596 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1597 enum nl80211_iftype type)
1598 {
1599 struct ieee80211_local *local = sdata->local;
1600 int ret, err;
1601 enum nl80211_iftype internal_type = type;
1602 bool p2p = false;
1603
1604 ASSERT_RTNL();
1605
1606 if (!local->ops->change_interface)
1607 return -EBUSY;
1608
1609 switch (sdata->vif.type) {
1610 case NL80211_IFTYPE_AP:
1611 case NL80211_IFTYPE_STATION:
1612 case NL80211_IFTYPE_ADHOC:
1613 case NL80211_IFTYPE_OCB:
1614 /*
1615 * Could maybe also all others here?
1616 * Just not sure how that interacts
1617 * with the RX/config path e.g. for
1618 * mesh.
1619 */
1620 break;
1621 default:
1622 return -EBUSY;
1623 }
1624
1625 switch (type) {
1626 case NL80211_IFTYPE_AP:
1627 case NL80211_IFTYPE_STATION:
1628 case NL80211_IFTYPE_ADHOC:
1629 case NL80211_IFTYPE_OCB:
1630 /*
1631 * Could probably support everything
1632 * but WDS here (WDS do_open can fail
1633 * under memory pressure, which this
1634 * code isn't prepared to handle).
1635 */
1636 break;
1637 case NL80211_IFTYPE_P2P_CLIENT:
1638 p2p = true;
1639 internal_type = NL80211_IFTYPE_STATION;
1640 break;
1641 case NL80211_IFTYPE_P2P_GO:
1642 p2p = true;
1643 internal_type = NL80211_IFTYPE_AP;
1644 break;
1645 default:
1646 return -EBUSY;
1647 }
1648
1649 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1650 if (ret)
1651 return ret;
1652
1653 ieee80211_stop_vif_queues(local, sdata,
1654 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1655 synchronize_net();
1656
1657 ieee80211_do_stop(sdata, false);
1658
1659 ieee80211_teardown_sdata(sdata);
1660
1661 ieee80211_set_sdata_offload_flags(sdata);
1662 ret = drv_change_interface(local, sdata, internal_type, p2p);
1663 if (ret)
1664 type = ieee80211_vif_type_p2p(&sdata->vif);
1665
1666 /*
1667 * Ignore return value here, there's not much we can do since
1668 * the driver changed the interface type internally already.
1669 * The warnings will hopefully make driver authors fix it :-)
1670 */
1671 ieee80211_check_queues(sdata, type);
1672
1673 ieee80211_setup_sdata(sdata, type);
1674 ieee80211_set_vif_encap_ops(sdata);
1675
1676 err = ieee80211_do_open(&sdata->wdev, false);
1677 WARN(err, "type change: do_open returned %d", err);
1678
1679 ieee80211_wake_vif_queues(local, sdata,
1680 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1681 return ret;
1682 }
1683
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1684 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1685 enum nl80211_iftype type)
1686 {
1687 int ret;
1688
1689 ASSERT_RTNL();
1690
1691 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1692 return 0;
1693
1694 if (ieee80211_sdata_running(sdata)) {
1695 ret = ieee80211_runtime_change_iftype(sdata, type);
1696 if (ret)
1697 return ret;
1698 } else {
1699 /* Purge and reset type-dependent state. */
1700 ieee80211_teardown_sdata(sdata);
1701 ieee80211_setup_sdata(sdata, type);
1702 }
1703
1704 /* reset some values that shouldn't be kept across type changes */
1705 if (type == NL80211_IFTYPE_STATION)
1706 sdata->u.mgd.use_4addr = false;
1707
1708 return 0;
1709 }
1710
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1711 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1712 u8 *perm_addr, enum nl80211_iftype type)
1713 {
1714 struct ieee80211_sub_if_data *sdata;
1715 u64 mask, start, addr, val, inc;
1716 u8 *m;
1717 u8 tmp_addr[ETH_ALEN];
1718 int i;
1719
1720 /* default ... something at least */
1721 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1722
1723 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1724 local->hw.wiphy->n_addresses <= 1)
1725 return;
1726
1727 mutex_lock(&local->iflist_mtx);
1728
1729 switch (type) {
1730 case NL80211_IFTYPE_MONITOR:
1731 /* doesn't matter */
1732 break;
1733 case NL80211_IFTYPE_WDS:
1734 case NL80211_IFTYPE_AP_VLAN:
1735 /* match up with an AP interface */
1736 list_for_each_entry(sdata, &local->interfaces, list) {
1737 if (sdata->vif.type != NL80211_IFTYPE_AP)
1738 continue;
1739 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1740 break;
1741 }
1742 /* keep default if no AP interface present */
1743 break;
1744 case NL80211_IFTYPE_P2P_CLIENT:
1745 case NL80211_IFTYPE_P2P_GO:
1746 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1747 list_for_each_entry(sdata, &local->interfaces, list) {
1748 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1749 continue;
1750 if (!ieee80211_sdata_running(sdata))
1751 continue;
1752 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1753 goto out_unlock;
1754 }
1755 }
1756 fallthrough;
1757 default:
1758 /* assign a new address if possible -- try n_addresses first */
1759 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1760 bool used = false;
1761
1762 list_for_each_entry(sdata, &local->interfaces, list) {
1763 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1764 sdata->vif.addr)) {
1765 used = true;
1766 break;
1767 }
1768 }
1769
1770 if (!used) {
1771 memcpy(perm_addr,
1772 local->hw.wiphy->addresses[i].addr,
1773 ETH_ALEN);
1774 break;
1775 }
1776 }
1777
1778 /* try mask if available */
1779 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1780 break;
1781
1782 m = local->hw.wiphy->addr_mask;
1783 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1784 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1785 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1786
1787 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1788 /* not a contiguous mask ... not handled now! */
1789 pr_info("not contiguous\n");
1790 break;
1791 }
1792
1793 /*
1794 * Pick address of existing interface in case user changed
1795 * MAC address manually, default to perm_addr.
1796 */
1797 m = local->hw.wiphy->perm_addr;
1798 list_for_each_entry(sdata, &local->interfaces, list) {
1799 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1800 continue;
1801 m = sdata->vif.addr;
1802 break;
1803 }
1804 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1805 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1806 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1807
1808 inc = 1ULL<<__ffs64(mask);
1809 val = (start & mask);
1810 addr = (start & ~mask) | (val & mask);
1811 do {
1812 bool used = false;
1813
1814 tmp_addr[5] = addr >> 0*8;
1815 tmp_addr[4] = addr >> 1*8;
1816 tmp_addr[3] = addr >> 2*8;
1817 tmp_addr[2] = addr >> 3*8;
1818 tmp_addr[1] = addr >> 4*8;
1819 tmp_addr[0] = addr >> 5*8;
1820
1821 val += inc;
1822
1823 list_for_each_entry(sdata, &local->interfaces, list) {
1824 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1825 used = true;
1826 break;
1827 }
1828 }
1829
1830 if (!used) {
1831 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1832 break;
1833 }
1834 addr = (start & ~mask) | (val & mask);
1835 } while (addr != start);
1836
1837 break;
1838 }
1839
1840 out_unlock:
1841 mutex_unlock(&local->iflist_mtx);
1842 }
1843
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)1844 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1845 unsigned char name_assign_type,
1846 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1847 struct vif_params *params)
1848 {
1849 struct net_device *ndev = NULL;
1850 struct ieee80211_sub_if_data *sdata = NULL;
1851 struct txq_info *txqi;
1852 void (*if_setup)(struct net_device *dev);
1853 int ret, i;
1854 int txqs = 1;
1855
1856 ASSERT_RTNL();
1857
1858 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1859 struct wireless_dev *wdev;
1860
1861 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1862 GFP_KERNEL);
1863 if (!sdata)
1864 return -ENOMEM;
1865 wdev = &sdata->wdev;
1866
1867 sdata->dev = NULL;
1868 strlcpy(sdata->name, name, IFNAMSIZ);
1869 ieee80211_assign_perm_addr(local, wdev->address, type);
1870 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1871 } else {
1872 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1873 sizeof(void *));
1874 int txq_size = 0;
1875
1876 if (local->ops->wake_tx_queue &&
1877 type != NL80211_IFTYPE_AP_VLAN &&
1878 (type != NL80211_IFTYPE_MONITOR ||
1879 (params->flags & MONITOR_FLAG_ACTIVE)))
1880 txq_size += sizeof(struct txq_info) +
1881 local->hw.txq_data_size;
1882
1883 if (local->ops->wake_tx_queue) {
1884 if_setup = ieee80211_if_setup_no_queue;
1885 } else {
1886 if_setup = ieee80211_if_setup;
1887 if (local->hw.queues >= IEEE80211_NUM_ACS)
1888 txqs = IEEE80211_NUM_ACS;
1889 }
1890
1891 ndev = alloc_netdev_mqs(size + txq_size,
1892 name, name_assign_type,
1893 if_setup, txqs, 1);
1894 if (!ndev)
1895 return -ENOMEM;
1896
1897 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1898 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1899
1900 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1901
1902 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1903 if (!ndev->tstats) {
1904 free_netdev(ndev);
1905 return -ENOMEM;
1906 }
1907
1908 ndev->needed_headroom = local->tx_headroom +
1909 4*6 /* four MAC addresses */
1910 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1911 + 6 /* mesh */
1912 + 8 /* rfc1042/bridge tunnel */
1913 - ETH_HLEN /* ethernet hard_header_len */
1914 + IEEE80211_ENCRYPT_HEADROOM;
1915 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1916
1917 ret = dev_alloc_name(ndev, ndev->name);
1918 if (ret < 0) {
1919 ieee80211_if_free(ndev);
1920 free_netdev(ndev);
1921 return ret;
1922 }
1923
1924 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1925 if (is_valid_ether_addr(params->macaddr))
1926 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1927 else
1928 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1929 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1930
1931 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1932 sdata = netdev_priv(ndev);
1933 ndev->ieee80211_ptr = &sdata->wdev;
1934 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1935 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1936
1937 if (txq_size) {
1938 txqi = netdev_priv(ndev) + size;
1939 ieee80211_txq_init(sdata, NULL, txqi, 0);
1940 }
1941
1942 sdata->dev = ndev;
1943 }
1944
1945 /* initialise type-independent data */
1946 sdata->wdev.wiphy = local->hw.wiphy;
1947 sdata->local = local;
1948
1949 ieee80211_init_frag_cache(&sdata->frags);
1950
1951 INIT_LIST_HEAD(&sdata->key_list);
1952
1953 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1954 ieee80211_dfs_cac_timer_work);
1955 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1956 ieee80211_delayed_tailroom_dec);
1957
1958 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1959 struct ieee80211_supported_band *sband;
1960 sband = local->hw.wiphy->bands[i];
1961 sdata->rc_rateidx_mask[i] =
1962 sband ? (1 << sband->n_bitrates) - 1 : 0;
1963 if (sband) {
1964 __le16 cap;
1965 u16 *vht_rate_mask;
1966
1967 memcpy(sdata->rc_rateidx_mcs_mask[i],
1968 sband->ht_cap.mcs.rx_mask,
1969 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1970
1971 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1972 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1973 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1974 } else {
1975 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1976 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1977 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1978 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1979 }
1980 }
1981
1982 ieee80211_set_default_queues(sdata);
1983
1984 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1985 sdata->user_power_level = local->user_power_level;
1986
1987 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1988
1989 /* setup type-dependent data */
1990 ieee80211_setup_sdata(sdata, type);
1991
1992 if (ndev) {
1993 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1994 if (type == NL80211_IFTYPE_STATION)
1995 sdata->u.mgd.use_4addr = params->use_4addr;
1996
1997 ndev->features |= local->hw.netdev_features;
1998 ndev->hw_features |= ndev->features &
1999 MAC80211_SUPPORTED_FEATURES_TX;
2000
2001 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2002
2003 /* MTU range is normally 256 - 2304, where the upper limit is
2004 * the maximum MSDU size. Monitor interfaces send and receive
2005 * MPDU and A-MSDU frames which may be much larger so we do
2006 * not impose an upper limit in that case.
2007 */
2008 ndev->min_mtu = 256;
2009 if (type == NL80211_IFTYPE_MONITOR)
2010 ndev->max_mtu = 0;
2011 else
2012 ndev->max_mtu = local->hw.max_mtu;
2013
2014 ret = register_netdevice(ndev);
2015 if (ret) {
2016 free_netdev(ndev);
2017 return ret;
2018 }
2019 }
2020
2021 mutex_lock(&local->iflist_mtx);
2022 list_add_tail_rcu(&sdata->list, &local->interfaces);
2023 mutex_unlock(&local->iflist_mtx);
2024
2025 if (new_wdev)
2026 *new_wdev = &sdata->wdev;
2027
2028 return 0;
2029 }
2030
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2031 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2032 {
2033 ASSERT_RTNL();
2034
2035 mutex_lock(&sdata->local->iflist_mtx);
2036 list_del_rcu(&sdata->list);
2037 mutex_unlock(&sdata->local->iflist_mtx);
2038
2039 if (sdata->vif.txq)
2040 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2041
2042 synchronize_rcu();
2043
2044 if (sdata->dev) {
2045 unregister_netdevice(sdata->dev);
2046 } else {
2047 cfg80211_unregister_wdev(&sdata->wdev);
2048 ieee80211_teardown_sdata(sdata);
2049 kfree(sdata);
2050 }
2051 }
2052
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2053 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2054 {
2055 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2056 return;
2057 ieee80211_do_stop(sdata, true);
2058 }
2059
ieee80211_remove_interfaces(struct ieee80211_local * local)2060 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2061 {
2062 struct ieee80211_sub_if_data *sdata, *tmp;
2063 LIST_HEAD(unreg_list);
2064 LIST_HEAD(wdev_list);
2065
2066 ASSERT_RTNL();
2067
2068 /* Before destroying the interfaces, make sure they're all stopped so
2069 * that the hardware is stopped. Otherwise, the driver might still be
2070 * iterating the interfaces during the shutdown, e.g. from a worker
2071 * or from RX processing or similar, and if it does so (using atomic
2072 * iteration) while we're manipulating the list, the iteration will
2073 * crash.
2074 *
2075 * After this, the hardware should be stopped and the driver should
2076 * have stopped all of its activities, so that we can do RCU-unaware
2077 * manipulations of the interface list below.
2078 */
2079 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2080
2081 WARN(local->open_count, "%s: open count remains %d\n",
2082 wiphy_name(local->hw.wiphy), local->open_count);
2083
2084 ieee80211_txq_teardown_flows(local);
2085
2086 mutex_lock(&local->iflist_mtx);
2087 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2088 list_del(&sdata->list);
2089
2090 if (sdata->dev)
2091 unregister_netdevice_queue(sdata->dev, &unreg_list);
2092 else
2093 list_add(&sdata->list, &wdev_list);
2094 }
2095 mutex_unlock(&local->iflist_mtx);
2096 unregister_netdevice_many(&unreg_list);
2097
2098 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2099 list_del(&sdata->list);
2100 cfg80211_unregister_wdev(&sdata->wdev);
2101 kfree(sdata);
2102 }
2103 }
2104
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2105 static int netdev_notify(struct notifier_block *nb,
2106 unsigned long state, void *ptr)
2107 {
2108 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2109 struct ieee80211_sub_if_data *sdata;
2110
2111 if (state != NETDEV_CHANGENAME)
2112 return NOTIFY_DONE;
2113
2114 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2115 return NOTIFY_DONE;
2116
2117 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2118 return NOTIFY_DONE;
2119
2120 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2121 memcpy(sdata->name, dev->name, IFNAMSIZ);
2122 ieee80211_debugfs_rename_netdev(sdata);
2123
2124 return NOTIFY_OK;
2125 }
2126
2127 static struct notifier_block mac80211_netdev_notifier = {
2128 .notifier_call = netdev_notify,
2129 };
2130
ieee80211_iface_init(void)2131 int ieee80211_iface_init(void)
2132 {
2133 return register_netdevice_notifier(&mac80211_netdev_notifier);
2134 }
2135
ieee80211_iface_exit(void)2136 void ieee80211_iface_exit(void)
2137 {
2138 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2139 }
2140
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2141 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2142 {
2143 if (sdata->vif.type == NL80211_IFTYPE_AP)
2144 atomic_inc(&sdata->u.ap.num_mcast_sta);
2145 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2146 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2147 }
2148
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2149 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2150 {
2151 if (sdata->vif.type == NL80211_IFTYPE_AP)
2152 atomic_dec(&sdata->u.ap.num_mcast_sta);
2153 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2154 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2155 }
2156