Merge tag 'arm-soc-fixes-v5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / net / mac80211 / iface.c
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 <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
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.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->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64                 power = min(power, sdata->user_power_level);
65
66         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67                 power = min(power, sdata->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
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_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
84 }
85
86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
87 {
88         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
89                 return 0;
90
91         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
92         return IEEE80211_CONF_CHANGE_IDLE;
93 }
94
95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
96 {
97         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
98                 return 0;
99
100         ieee80211_flush_queues(local, NULL, false);
101
102         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103         return IEEE80211_CONF_CHANGE_IDLE;
104 }
105
106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107                                    bool force_active)
108 {
109         bool working, scanning, active;
110         unsigned int led_trig_start = 0, led_trig_stop = 0;
111
112         lockdep_assert_held(&local->mtx);
113
114         active = force_active ||
115                  !list_empty(&local->chanctx_list) ||
116                  local->monitors;
117
118         working = !local->ops->remain_on_channel &&
119                   !list_empty(&local->roc_list);
120
121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124         if (working || scanning)
125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126         else
127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129         if (active)
130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131         else
132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136         if (working || scanning || active)
137                 return __ieee80211_idle_off(local);
138         return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143         return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148         u32 change = __ieee80211_recalc_idle(local, false);
149         if (change)
150                 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
154                                 bool check_dup)
155 {
156         struct ieee80211_local *local = sdata->local;
157         struct ieee80211_sub_if_data *iter;
158         u64 new, mask, tmp;
159         u8 *m;
160         int ret = 0;
161
162         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
163                 return 0;
164
165         m = addr;
166         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
167                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
168                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
169
170         m = local->hw.wiphy->addr_mask;
171         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174
175         if (!check_dup)
176                 return ret;
177
178         mutex_lock(&local->iflist_mtx);
179         list_for_each_entry(iter, &local->interfaces, list) {
180                 if (iter == sdata)
181                         continue;
182
183                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
184                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
185                         continue;
186
187                 m = iter->vif.addr;
188                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
189                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
190                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
191
192                 if ((new & ~mask) != (tmp & ~mask)) {
193                         ret = -EINVAL;
194                         break;
195                 }
196         }
197         mutex_unlock(&local->iflist_mtx);
198
199         return ret;
200 }
201
202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
203 {
204         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
205         struct sockaddr *sa = addr;
206         bool check_dup = true;
207         int ret;
208
209         if (ieee80211_sdata_running(sdata))
210                 return -EBUSY;
211
212         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
213             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
214                 check_dup = false;
215
216         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
217         if (ret)
218                 return ret;
219
220         ret = eth_mac_addr(dev, sa);
221
222         if (ret == 0)
223                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
224
225         return ret;
226 }
227
228 static inline int identical_mac_addr_allowed(int type1, int type2)
229 {
230         return type1 == NL80211_IFTYPE_MONITOR ||
231                 type2 == NL80211_IFTYPE_MONITOR ||
232                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
233                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
235                 (type1 == NL80211_IFTYPE_AP_VLAN &&
236                         (type2 == NL80211_IFTYPE_AP ||
237                          type2 == NL80211_IFTYPE_AP_VLAN));
238 }
239
240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
241                                             enum nl80211_iftype iftype)
242 {
243         struct ieee80211_local *local = sdata->local;
244         struct ieee80211_sub_if_data *nsdata;
245         int ret;
246
247         ASSERT_RTNL();
248
249         /* we hold the RTNL here so can safely walk the list */
250         list_for_each_entry(nsdata, &local->interfaces, list) {
251                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
252                         /*
253                          * Only OCB and monitor mode may coexist
254                          */
255                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
256                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
257                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
258                              nsdata->vif.type == NL80211_IFTYPE_OCB))
259                                 return -EBUSY;
260
261                         /*
262                          * Allow only a single IBSS interface to be up at any
263                          * time. This is restricted because beacon distribution
264                          * cannot work properly if both are in the same IBSS.
265                          *
266                          * To remove this restriction we'd have to disallow them
267                          * from setting the same SSID on different IBSS interfaces
268                          * belonging to the same hardware. Then, however, we're
269                          * faced with having to adopt two different TSF timers...
270                          */
271                         if (iftype == NL80211_IFTYPE_ADHOC &&
272                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
273                                 return -EBUSY;
274                         /*
275                          * will not add another interface while any channel
276                          * switch is active.
277                          */
278                         if (nsdata->vif.csa_active)
279                                 return -EBUSY;
280
281                         /*
282                          * The remaining checks are only performed for interfaces
283                          * with the same MAC address.
284                          */
285                         if (!ether_addr_equal(sdata->vif.addr,
286                                               nsdata->vif.addr))
287                                 continue;
288
289                         /*
290                          * check whether it may have the same address
291                          */
292                         if (!identical_mac_addr_allowed(iftype,
293                                                         nsdata->vif.type))
294                                 return -ENOTUNIQ;
295
296                         /*
297                          * can only add VLANs to enabled APs
298                          */
299                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
300                             nsdata->vif.type == NL80211_IFTYPE_AP)
301                                 sdata->bss = &nsdata->u.ap;
302                 }
303         }
304
305         mutex_lock(&local->chanctx_mtx);
306         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
307         mutex_unlock(&local->chanctx_mtx);
308         return ret;
309 }
310
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312                                   enum nl80211_iftype iftype)
313 {
314         int n_queues = sdata->local->hw.queues;
315         int i;
316
317         if (iftype == NL80211_IFTYPE_NAN)
318                 return 0;
319
320         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
321                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
323                                          IEEE80211_INVAL_HW_QUEUE))
324                                 return -EINVAL;
325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
326                                          n_queues))
327                                 return -EINVAL;
328                 }
329         }
330
331         if ((iftype != NL80211_IFTYPE_AP &&
332              iftype != NL80211_IFTYPE_P2P_GO &&
333              iftype != NL80211_IFTYPE_MESH_POINT) ||
334             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
335                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
336                 return 0;
337         }
338
339         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
340                 return -EINVAL;
341
342         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
343                 return -EINVAL;
344
345         return 0;
346 }
347
348 static int ieee80211_open(struct net_device *dev)
349 {
350         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
351         int err;
352
353         /* fail early if user set an invalid address */
354         if (!is_valid_ether_addr(dev->dev_addr))
355                 return -EADDRNOTAVAIL;
356
357         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
358         if (err)
359                 return err;
360
361         wiphy_lock(sdata->local->hw.wiphy);
362         err = ieee80211_do_open(&sdata->wdev, true);
363         wiphy_unlock(sdata->local->hw.wiphy);
364
365         return err;
366 }
367
368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 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          * For AP_VLANs stations may exist since there's nothing else that
421          * would have removed them, but in other modes there shouldn't
422          * be any stations.
423          */
424         flushed = sta_info_flush(sdata);
425         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
426
427         /* don't count this interface for allmulti while it is down */
428         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
429                 atomic_dec(&local->iff_allmultis);
430
431         if (sdata->vif.type == NL80211_IFTYPE_AP) {
432                 local->fif_pspoll--;
433                 local->fif_probe_req--;
434         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
435                 local->fif_probe_req--;
436         }
437
438         if (sdata->dev) {
439                 netif_addr_lock_bh(sdata->dev);
440                 spin_lock_bh(&local->filter_lock);
441                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
442                                  sdata->dev->addr_len);
443                 spin_unlock_bh(&local->filter_lock);
444                 netif_addr_unlock_bh(sdata->dev);
445         }
446
447         del_timer_sync(&local->dynamic_ps_timer);
448         cancel_work_sync(&local->dynamic_ps_enable_work);
449
450         cancel_work_sync(&sdata->recalc_smps);
451         sdata_lock(sdata);
452         mutex_lock(&local->mtx);
453         sdata->vif.csa_active = false;
454         if (sdata->vif.type == NL80211_IFTYPE_STATION)
455                 sdata->u.mgd.csa_waiting_bcn = false;
456         if (sdata->csa_block_tx) {
457                 ieee80211_wake_vif_queues(local, sdata,
458                                           IEEE80211_QUEUE_STOP_REASON_CSA);
459                 sdata->csa_block_tx = false;
460         }
461         mutex_unlock(&local->mtx);
462         sdata_unlock(sdata);
463
464         cancel_work_sync(&sdata->csa_finalize_work);
465
466         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
467
468         if (sdata->wdev.cac_started) {
469                 chandef = sdata->vif.bss_conf.chandef;
470                 WARN_ON(local->suspended);
471                 mutex_lock(&local->mtx);
472                 ieee80211_vif_release_channel(sdata);
473                 mutex_unlock(&local->mtx);
474                 cfg80211_cac_event(sdata->dev, &chandef,
475                                    NL80211_RADAR_CAC_ABORTED,
476                                    GFP_KERNEL);
477         }
478
479         /* APs need special treatment */
480         if (sdata->vif.type == NL80211_IFTYPE_AP) {
481                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
482
483                 /* down all dependent devices, that is VLANs */
484                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
485                                          u.vlan.list)
486                         dev_close(vlan->dev);
487                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
488         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
489                 /* remove all packets in parent bc_buf pointing to this dev */
490                 ps = &sdata->bss->ps;
491
492                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
493                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
494                         if (skb->dev == sdata->dev) {
495                                 __skb_unlink(skb, &ps->bc_buf);
496                                 local->total_ps_buffered--;
497                                 ieee80211_free_txskb(&local->hw, skb);
498                         }
499                 }
500                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
501         }
502
503         if (going_down)
504                 local->open_count--;
505
506         switch (sdata->vif.type) {
507         case NL80211_IFTYPE_AP_VLAN:
508                 mutex_lock(&local->mtx);
509                 list_del(&sdata->u.vlan.list);
510                 mutex_unlock(&local->mtx);
511                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
512                 /* see comment in the default case below */
513                 ieee80211_free_keys(sdata, true);
514                 /* no need to tell driver */
515                 break;
516         case NL80211_IFTYPE_MONITOR:
517                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
518                         local->cooked_mntrs--;
519                         break;
520                 }
521
522                 local->monitors--;
523                 if (local->monitors == 0) {
524                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
525                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
526                 }
527
528                 ieee80211_adjust_monitor_flags(sdata, -1);
529                 break;
530         case NL80211_IFTYPE_NAN:
531                 /* clean all the functions */
532                 spin_lock_bh(&sdata->u.nan.func_lock);
533
534                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
535                         idr_remove(&sdata->u.nan.function_inst_ids, i);
536                         cfg80211_free_nan_func(func);
537                 }
538                 idr_destroy(&sdata->u.nan.function_inst_ids);
539
540                 spin_unlock_bh(&sdata->u.nan.func_lock);
541                 break;
542         case NL80211_IFTYPE_P2P_DEVICE:
543                 /* relies on synchronize_rcu() below */
544                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
545                 fallthrough;
546         default:
547                 cancel_work_sync(&sdata->work);
548                 /*
549                  * When we get here, the interface is marked down.
550                  * Free the remaining keys, if there are any
551                  * (which can happen in AP mode if userspace sets
552                  * keys before the interface is operating)
553                  *
554                  * Force the key freeing to always synchronize_net()
555                  * to wait for the RX path in case it is using this
556                  * interface enqueuing frames at this very time on
557                  * another CPU.
558                  */
559                 ieee80211_free_keys(sdata, true);
560                 skb_queue_purge(&sdata->skb_queue);
561         }
562
563         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
564         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
565                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
566                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
567                         if (info->control.vif == &sdata->vif) {
568                                 __skb_unlink(skb, &local->pending[i]);
569                                 ieee80211_free_txskb(&local->hw, skb);
570                         }
571                 }
572         }
573         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
574
575         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
576                 ieee80211_txq_remove_vlan(local, sdata);
577
578         sdata->bss = NULL;
579
580         if (local->open_count == 0)
581                 ieee80211_clear_tx_pending(local);
582
583         sdata->vif.bss_conf.beacon_int = 0;
584
585         /*
586          * If the interface goes down while suspended, presumably because
587          * the device was unplugged and that happens before our resume,
588          * then the driver is already unconfigured and the remainder of
589          * this function isn't needed.
590          * XXX: what about WoWLAN? If the device has software state, e.g.
591          *      memory allocated, it might expect teardown commands from
592          *      mac80211 here?
593          */
594         if (local->suspended) {
595                 WARN_ON(local->wowlan);
596                 WARN_ON(rtnl_dereference(local->monitor_sdata));
597                 return;
598         }
599
600         switch (sdata->vif.type) {
601         case NL80211_IFTYPE_AP_VLAN:
602                 break;
603         case NL80211_IFTYPE_MONITOR:
604                 if (local->monitors == 0)
605                         ieee80211_del_virtual_monitor(local);
606
607                 mutex_lock(&local->mtx);
608                 ieee80211_recalc_idle(local);
609                 mutex_unlock(&local->mtx);
610
611                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
612                         break;
613
614                 fallthrough;
615         default:
616                 if (going_down)
617                         drv_remove_interface(local, sdata);
618         }
619
620         ieee80211_recalc_ps(local);
621
622         if (cancel_scan)
623                 flush_delayed_work(&local->scan_work);
624
625         if (local->open_count == 0) {
626                 ieee80211_stop_device(local);
627
628                 /* no reconfiguring after stop! */
629                 return;
630         }
631
632         /* do after stop to avoid reconfiguring when we stop anyway */
633         ieee80211_configure_filter(local);
634         ieee80211_hw_config(local, hw_reconf_flags);
635
636         if (local->monitors == local->open_count)
637                 ieee80211_add_virtual_monitor(local);
638 }
639
640 static int ieee80211_stop(struct net_device *dev)
641 {
642         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
643
644         wiphy_lock(sdata->local->hw.wiphy);
645         ieee80211_do_stop(sdata, true);
646         wiphy_unlock(sdata->local->hw.wiphy);
647
648         return 0;
649 }
650
651 static void ieee80211_set_multicast_list(struct net_device *dev)
652 {
653         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
654         struct ieee80211_local *local = sdata->local;
655         int allmulti, sdata_allmulti;
656
657         allmulti = !!(dev->flags & IFF_ALLMULTI);
658         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
659
660         if (allmulti != sdata_allmulti) {
661                 if (dev->flags & IFF_ALLMULTI)
662                         atomic_inc(&local->iff_allmultis);
663                 else
664                         atomic_dec(&local->iff_allmultis);
665                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
666         }
667
668         spin_lock_bh(&local->filter_lock);
669         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
670         spin_unlock_bh(&local->filter_lock);
671         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
672 }
673
674 /*
675  * Called when the netdev is removed or, by the code below, before
676  * the interface type changes.
677  */
678 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
679 {
680         /* free extra data */
681         ieee80211_free_keys(sdata, false);
682
683         ieee80211_debugfs_remove_netdev(sdata);
684
685         ieee80211_destroy_frag_cache(&sdata->frags);
686
687         if (ieee80211_vif_is_mesh(&sdata->vif))
688                 ieee80211_mesh_teardown_sdata(sdata);
689 }
690
691 static void ieee80211_uninit(struct net_device *dev)
692 {
693         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
694 }
695
696 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
697                                          struct sk_buff *skb,
698                                          struct net_device *sb_dev)
699 {
700         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
701 }
702
703 static void
704 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
705 {
706         dev_fetch_sw_netstats(stats, dev->tstats);
707 }
708
709 static const struct net_device_ops ieee80211_dataif_ops = {
710         .ndo_open               = ieee80211_open,
711         .ndo_stop               = ieee80211_stop,
712         .ndo_uninit             = ieee80211_uninit,
713         .ndo_start_xmit         = ieee80211_subif_start_xmit,
714         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
715         .ndo_set_mac_address    = ieee80211_change_mac,
716         .ndo_select_queue       = ieee80211_netdev_select_queue,
717         .ndo_get_stats64        = ieee80211_get_stats64,
718 };
719
720 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
721                                           struct sk_buff *skb,
722                                           struct net_device *sb_dev)
723 {
724         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
725         struct ieee80211_local *local = sdata->local;
726         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
727         struct ieee80211_hdr *hdr;
728         int len_rthdr;
729
730         if (local->hw.queues < IEEE80211_NUM_ACS)
731                 return 0;
732
733         /* reset flags and info before parsing radiotap header */
734         memset(info, 0, sizeof(*info));
735
736         if (!ieee80211_parse_tx_radiotap(skb, dev))
737                 return 0; /* doesn't matter, frame will be dropped */
738
739         len_rthdr = ieee80211_get_radiotap_len(skb->data);
740         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
741         if (skb->len < len_rthdr + 2 ||
742             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
743                 return 0; /* doesn't matter, frame will be dropped */
744
745         return ieee80211_select_queue_80211(sdata, skb, hdr);
746 }
747
748 static const struct net_device_ops ieee80211_monitorif_ops = {
749         .ndo_open               = ieee80211_open,
750         .ndo_stop               = ieee80211_stop,
751         .ndo_uninit             = ieee80211_uninit,
752         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
753         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
754         .ndo_set_mac_address    = ieee80211_change_mac,
755         .ndo_select_queue       = ieee80211_monitor_select_queue,
756         .ndo_get_stats64        = ieee80211_get_stats64,
757 };
758
759 static const struct net_device_ops ieee80211_dataif_8023_ops = {
760         .ndo_open               = ieee80211_open,
761         .ndo_stop               = ieee80211_stop,
762         .ndo_uninit             = ieee80211_uninit,
763         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
764         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
765         .ndo_set_mac_address    = ieee80211_change_mac,
766         .ndo_select_queue       = ieee80211_netdev_select_queue,
767         .ndo_get_stats64        = ieee80211_get_stats64,
768 };
769
770 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
771 {
772         switch (iftype) {
773         /* P2P GO and client are mapped to AP/STATION types */
774         case NL80211_IFTYPE_AP:
775         case NL80211_IFTYPE_STATION:
776                 return true;
777         default:
778                 return false;
779         }
780 }
781
782 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
783 {
784         struct ieee80211_local *local = sdata->local;
785         u32 flags;
786
787         flags = sdata->vif.offload_flags;
788
789         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
790             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
791                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
792
793                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
794                     local->hw.wiphy->frag_threshold != (u32)-1)
795                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
796
797                 if (local->monitors)
798                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
799         } else {
800                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
801         }
802
803         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
804             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
805                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
806
807                 if (local->monitors &&
808                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
809                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
810         } else {
811                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
812         }
813
814         if (sdata->vif.offload_flags == flags)
815                 return false;
816
817         sdata->vif.offload_flags = flags;
818         ieee80211_check_fast_rx_iface(sdata);
819         return true;
820 }
821
822 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
823 {
824         struct ieee80211_local *local = sdata->local;
825         struct ieee80211_sub_if_data *bss = sdata;
826         bool enabled;
827
828         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
829                 if (!sdata->bss)
830                         return;
831
832                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
833         }
834
835         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
836             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
837                 return;
838
839         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
840         if (sdata->wdev.use_4addr &&
841             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
842                 enabled = false;
843
844         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
845                                            &ieee80211_dataif_ops;
846 }
847
848 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
849 {
850         struct ieee80211_local *local = sdata->local;
851         struct ieee80211_sub_if_data *vsdata;
852
853         if (ieee80211_set_sdata_offload_flags(sdata)) {
854                 drv_update_vif_offload(local, sdata);
855                 ieee80211_set_vif_encap_ops(sdata);
856         }
857
858         list_for_each_entry(vsdata, &local->interfaces, list) {
859                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
860                     vsdata->bss != &sdata->u.ap)
861                         continue;
862
863                 ieee80211_set_vif_encap_ops(vsdata);
864         }
865 }
866
867 void ieee80211_recalc_offload(struct ieee80211_local *local)
868 {
869         struct ieee80211_sub_if_data *sdata;
870
871         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
872                 return;
873
874         mutex_lock(&local->iflist_mtx);
875
876         list_for_each_entry(sdata, &local->interfaces, list) {
877                 if (!ieee80211_sdata_running(sdata))
878                         continue;
879
880                 ieee80211_recalc_sdata_offload(sdata);
881         }
882
883         mutex_unlock(&local->iflist_mtx);
884 }
885
886 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
887                                     const int offset)
888 {
889         struct ieee80211_local *local = sdata->local;
890         u32 flags = sdata->u.mntr.flags;
891
892 #define ADJUST(_f, _s)  do {                                    \
893         if (flags & MONITOR_FLAG_##_f)                          \
894                 local->fif_##_s += offset;                      \
895         } while (0)
896
897         ADJUST(FCSFAIL, fcsfail);
898         ADJUST(PLCPFAIL, plcpfail);
899         ADJUST(CONTROL, control);
900         ADJUST(CONTROL, pspoll);
901         ADJUST(OTHER_BSS, other_bss);
902
903 #undef ADJUST
904 }
905
906 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
907 {
908         struct ieee80211_local *local = sdata->local;
909         int i;
910
911         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
912                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
913                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
914                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
915                         sdata->vif.hw_queue[i] = i;
916                 else
917                         sdata->vif.hw_queue[i] = 0;
918         }
919         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
920 }
921
922 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
923 {
924         struct ieee80211_sub_if_data *sdata;
925         int ret;
926
927         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
928                 return 0;
929
930         ASSERT_RTNL();
931
932         if (local->monitor_sdata)
933                 return 0;
934
935         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
936         if (!sdata)
937                 return -ENOMEM;
938
939         /* set up data */
940         sdata->local = local;
941         sdata->vif.type = NL80211_IFTYPE_MONITOR;
942         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
943                  wiphy_name(local->hw.wiphy));
944         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
945
946         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
947
948         ieee80211_set_default_queues(sdata);
949
950         ret = drv_add_interface(local, sdata);
951         if (WARN_ON(ret)) {
952                 /* ok .. stupid driver, it asked for this! */
953                 kfree(sdata);
954                 return ret;
955         }
956
957         set_bit(SDATA_STATE_RUNNING, &sdata->state);
958
959         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
960         if (ret) {
961                 kfree(sdata);
962                 return ret;
963         }
964
965         mutex_lock(&local->iflist_mtx);
966         rcu_assign_pointer(local->monitor_sdata, sdata);
967         mutex_unlock(&local->iflist_mtx);
968
969         mutex_lock(&local->mtx);
970         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
971                                         IEEE80211_CHANCTX_EXCLUSIVE);
972         mutex_unlock(&local->mtx);
973         if (ret) {
974                 mutex_lock(&local->iflist_mtx);
975                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
976                 mutex_unlock(&local->iflist_mtx);
977                 synchronize_net();
978                 drv_remove_interface(local, sdata);
979                 kfree(sdata);
980                 return ret;
981         }
982
983         skb_queue_head_init(&sdata->skb_queue);
984         INIT_WORK(&sdata->work, ieee80211_iface_work);
985
986         return 0;
987 }
988
989 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
990 {
991         struct ieee80211_sub_if_data *sdata;
992
993         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
994                 return;
995
996         ASSERT_RTNL();
997
998         mutex_lock(&local->iflist_mtx);
999
1000         sdata = rcu_dereference_protected(local->monitor_sdata,
1001                                           lockdep_is_held(&local->iflist_mtx));
1002         if (!sdata) {
1003                 mutex_unlock(&local->iflist_mtx);
1004                 return;
1005         }
1006
1007         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1008         mutex_unlock(&local->iflist_mtx);
1009
1010         synchronize_net();
1011
1012         mutex_lock(&local->mtx);
1013         ieee80211_vif_release_channel(sdata);
1014         mutex_unlock(&local->mtx);
1015
1016         drv_remove_interface(local, sdata);
1017
1018         kfree(sdata);
1019 }
1020
1021 /*
1022  * NOTE: Be very careful when changing this function, it must NOT return
1023  * an error on interface type changes that have been pre-checked, so most
1024  * checks should be in ieee80211_check_concurrent_iface.
1025  */
1026 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1027 {
1028         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1029         struct net_device *dev = wdev->netdev;
1030         struct ieee80211_local *local = sdata->local;
1031         u32 changed = 0;
1032         int res;
1033         u32 hw_reconf_flags = 0;
1034
1035         switch (sdata->vif.type) {
1036         case NL80211_IFTYPE_AP_VLAN: {
1037                 struct ieee80211_sub_if_data *master;
1038
1039                 if (!sdata->bss)
1040                         return -ENOLINK;
1041
1042                 mutex_lock(&local->mtx);
1043                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1044                 mutex_unlock(&local->mtx);
1045
1046                 master = container_of(sdata->bss,
1047                                       struct ieee80211_sub_if_data, u.ap);
1048                 sdata->control_port_protocol =
1049                         master->control_port_protocol;
1050                 sdata->control_port_no_encrypt =
1051                         master->control_port_no_encrypt;
1052                 sdata->control_port_over_nl80211 =
1053                         master->control_port_over_nl80211;
1054                 sdata->control_port_no_preauth =
1055                         master->control_port_no_preauth;
1056                 sdata->vif.cab_queue = master->vif.cab_queue;
1057                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1058                        sizeof(sdata->vif.hw_queue));
1059                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1060
1061                 mutex_lock(&local->key_mtx);
1062                 sdata->crypto_tx_tailroom_needed_cnt +=
1063                         master->crypto_tx_tailroom_needed_cnt;
1064                 mutex_unlock(&local->key_mtx);
1065
1066                 break;
1067                 }
1068         case NL80211_IFTYPE_AP:
1069                 sdata->bss = &sdata->u.ap;
1070                 break;
1071         case NL80211_IFTYPE_MESH_POINT:
1072         case NL80211_IFTYPE_STATION:
1073         case NL80211_IFTYPE_MONITOR:
1074         case NL80211_IFTYPE_ADHOC:
1075         case NL80211_IFTYPE_P2P_DEVICE:
1076         case NL80211_IFTYPE_OCB:
1077         case NL80211_IFTYPE_NAN:
1078                 /* no special treatment */
1079                 break;
1080         case NL80211_IFTYPE_UNSPECIFIED:
1081         case NUM_NL80211_IFTYPES:
1082         case NL80211_IFTYPE_P2P_CLIENT:
1083         case NL80211_IFTYPE_P2P_GO:
1084         case NL80211_IFTYPE_WDS:
1085                 /* cannot happen */
1086                 WARN_ON(1);
1087                 break;
1088         }
1089
1090         if (local->open_count == 0) {
1091                 res = drv_start(local);
1092                 if (res)
1093                         goto err_del_bss;
1094                 /* we're brought up, everything changes */
1095                 hw_reconf_flags = ~0;
1096                 ieee80211_led_radio(local, true);
1097                 ieee80211_mod_tpt_led_trig(local,
1098                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1099         }
1100
1101         /*
1102          * Copy the hopefully now-present MAC address to
1103          * this interface, if it has the special null one.
1104          */
1105         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1106                 memcpy(dev->dev_addr,
1107                        local->hw.wiphy->perm_addr,
1108                        ETH_ALEN);
1109                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1110
1111                 if (!is_valid_ether_addr(dev->dev_addr)) {
1112                         res = -EADDRNOTAVAIL;
1113                         goto err_stop;
1114                 }
1115         }
1116
1117         switch (sdata->vif.type) {
1118         case NL80211_IFTYPE_AP_VLAN:
1119                 /* no need to tell driver, but set carrier and chanctx */
1120                 if (rtnl_dereference(sdata->bss->beacon)) {
1121                         ieee80211_vif_vlan_copy_chanctx(sdata);
1122                         netif_carrier_on(dev);
1123                         ieee80211_set_vif_encap_ops(sdata);
1124                 } else {
1125                         netif_carrier_off(dev);
1126                 }
1127                 break;
1128         case NL80211_IFTYPE_MONITOR:
1129                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1130                         local->cooked_mntrs++;
1131                         break;
1132                 }
1133
1134                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1135                         res = drv_add_interface(local, sdata);
1136                         if (res)
1137                                 goto err_stop;
1138                 } else if (local->monitors == 0 && local->open_count == 0) {
1139                         res = ieee80211_add_virtual_monitor(local);
1140                         if (res)
1141                                 goto err_stop;
1142                 }
1143
1144                 /* must be before the call to ieee80211_configure_filter */
1145                 local->monitors++;
1146                 if (local->monitors == 1) {
1147                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1148                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1149                 }
1150
1151                 ieee80211_adjust_monitor_flags(sdata, 1);
1152                 ieee80211_configure_filter(local);
1153                 ieee80211_recalc_offload(local);
1154                 mutex_lock(&local->mtx);
1155                 ieee80211_recalc_idle(local);
1156                 mutex_unlock(&local->mtx);
1157
1158                 netif_carrier_on(dev);
1159                 break;
1160         default:
1161                 if (coming_up) {
1162                         ieee80211_del_virtual_monitor(local);
1163                         ieee80211_set_sdata_offload_flags(sdata);
1164
1165                         res = drv_add_interface(local, sdata);
1166                         if (res)
1167                                 goto err_stop;
1168
1169                         ieee80211_set_vif_encap_ops(sdata);
1170                         res = ieee80211_check_queues(sdata,
1171                                 ieee80211_vif_type_p2p(&sdata->vif));
1172                         if (res)
1173                                 goto err_del_interface;
1174                 }
1175
1176                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1177                         local->fif_pspoll++;
1178                         local->fif_probe_req++;
1179
1180                         ieee80211_configure_filter(local);
1181                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1182                         local->fif_probe_req++;
1183                 }
1184
1185                 if (sdata->vif.probe_req_reg)
1186                         drv_config_iface_filter(local, sdata,
1187                                                 FIF_PROBE_REQ,
1188                                                 FIF_PROBE_REQ);
1189
1190                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1191                     sdata->vif.type != NL80211_IFTYPE_NAN)
1192                         changed |= ieee80211_reset_erp_info(sdata);
1193                 ieee80211_bss_info_change_notify(sdata, changed);
1194
1195                 switch (sdata->vif.type) {
1196                 case NL80211_IFTYPE_STATION:
1197                 case NL80211_IFTYPE_ADHOC:
1198                 case NL80211_IFTYPE_AP:
1199                 case NL80211_IFTYPE_MESH_POINT:
1200                 case NL80211_IFTYPE_OCB:
1201                         netif_carrier_off(dev);
1202                         break;
1203                 case NL80211_IFTYPE_P2P_DEVICE:
1204                 case NL80211_IFTYPE_NAN:
1205                         break;
1206                 default:
1207                         /* not reached */
1208                         WARN_ON(1);
1209                 }
1210
1211                 /*
1212                  * Set default queue parameters so drivers don't
1213                  * need to initialise the hardware if the hardware
1214                  * doesn't start up with sane defaults.
1215                  * Enable QoS for anything but station interfaces.
1216                  */
1217                 ieee80211_set_wmm_default(sdata, true,
1218                         sdata->vif.type != NL80211_IFTYPE_STATION);
1219         }
1220
1221         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1222
1223         switch (sdata->vif.type) {
1224         case NL80211_IFTYPE_P2P_DEVICE:
1225                 rcu_assign_pointer(local->p2p_sdata, sdata);
1226                 break;
1227         case NL80211_IFTYPE_MONITOR:
1228                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1229                         break;
1230                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1231                 break;
1232         default:
1233                 break;
1234         }
1235
1236         /*
1237          * set_multicast_list will be invoked by the networking core
1238          * which will check whether any increments here were done in
1239          * error and sync them down to the hardware as filter flags.
1240          */
1241         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1242                 atomic_inc(&local->iff_allmultis);
1243
1244         if (coming_up)
1245                 local->open_count++;
1246
1247         if (hw_reconf_flags)
1248                 ieee80211_hw_config(local, hw_reconf_flags);
1249
1250         ieee80211_recalc_ps(local);
1251
1252         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1253             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1254             local->ops->wake_tx_queue) {
1255                 /* XXX: for AP_VLAN, actually track AP queues */
1256                 if (dev)
1257                         netif_tx_start_all_queues(dev);
1258         } else if (dev) {
1259                 unsigned long flags;
1260                 int n_acs = IEEE80211_NUM_ACS;
1261                 int ac;
1262
1263                 if (local->hw.queues < IEEE80211_NUM_ACS)
1264                         n_acs = 1;
1265
1266                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1267                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1268                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1269                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1270                         for (ac = 0; ac < n_acs; ac++) {
1271                                 int ac_queue = sdata->vif.hw_queue[ac];
1272
1273                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1274                                     skb_queue_empty(&local->pending[ac_queue]))
1275                                         netif_start_subqueue(dev, ac);
1276                         }
1277                 }
1278                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1279         }
1280
1281         return 0;
1282  err_del_interface:
1283         drv_remove_interface(local, sdata);
1284  err_stop:
1285         if (!local->open_count)
1286                 drv_stop(local);
1287  err_del_bss:
1288         sdata->bss = NULL;
1289         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1290                 mutex_lock(&local->mtx);
1291                 list_del(&sdata->u.vlan.list);
1292                 mutex_unlock(&local->mtx);
1293         }
1294         /* might already be clear but that doesn't matter */
1295         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1296         return res;
1297 }
1298
1299 static void ieee80211_if_free(struct net_device *dev)
1300 {
1301         free_percpu(dev->tstats);
1302 }
1303
1304 static void ieee80211_if_setup(struct net_device *dev)
1305 {
1306         ether_setup(dev);
1307         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1308         dev->netdev_ops = &ieee80211_dataif_ops;
1309         dev->needs_free_netdev = true;
1310         dev->priv_destructor = ieee80211_if_free;
1311 }
1312
1313 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1314 {
1315         ieee80211_if_setup(dev);
1316         dev->priv_flags |= IFF_NO_QUEUE;
1317 }
1318
1319 static void ieee80211_iface_work(struct work_struct *work)
1320 {
1321         struct ieee80211_sub_if_data *sdata =
1322                 container_of(work, struct ieee80211_sub_if_data, work);
1323         struct ieee80211_local *local = sdata->local;
1324         struct sk_buff *skb;
1325         struct sta_info *sta;
1326
1327         if (!ieee80211_sdata_running(sdata))
1328                 return;
1329
1330         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1331                 return;
1332
1333         if (!ieee80211_can_run_worker(local))
1334                 return;
1335
1336         /* first process frames */
1337         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1338                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1339
1340                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1341                 if (ieee80211_is_action(mgmt->frame_control) &&
1342                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1343                         int len = skb->len;
1344
1345                         mutex_lock(&local->sta_mtx);
1346                         sta = sta_info_get_bss(sdata, mgmt->sa);
1347                         if (sta) {
1348                                 switch (mgmt->u.action.u.addba_req.action_code) {
1349                                 case WLAN_ACTION_ADDBA_REQ:
1350                                         ieee80211_process_addba_request(
1351                                                         local, sta, mgmt, len);
1352                                         break;
1353                                 case WLAN_ACTION_ADDBA_RESP:
1354                                         ieee80211_process_addba_resp(local, sta,
1355                                                                      mgmt, len);
1356                                         break;
1357                                 case WLAN_ACTION_DELBA:
1358                                         ieee80211_process_delba(sdata, sta,
1359                                                                 mgmt, len);
1360                                         break;
1361                                 default:
1362                                         WARN_ON(1);
1363                                         break;
1364                                 }
1365                         }
1366                         mutex_unlock(&local->sta_mtx);
1367                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1368                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1369                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1370                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1371                                 struct ieee80211_rx_status *status;
1372                                 enum nl80211_band band;
1373                                 u8 opmode;
1374
1375                                 status = IEEE80211_SKB_RXCB(skb);
1376                                 band = status->band;
1377                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1378
1379                                 mutex_lock(&local->sta_mtx);
1380                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1381
1382                                 if (sta)
1383                                         ieee80211_vht_handle_opmode(sdata, sta,
1384                                                                     opmode,
1385                                                                     band);
1386
1387                                 mutex_unlock(&local->sta_mtx);
1388                                 break;
1389                         }
1390                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1391                                 ieee80211_process_mu_groups(sdata, mgmt);
1392                                 break;
1393                         default:
1394                                 WARN_ON(1);
1395                                 break;
1396                         }
1397                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1398                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1399                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1400                         else
1401                                 WARN_ON(1);
1402                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1403                         struct ieee80211_hdr *hdr = (void *)mgmt;
1404                         /*
1405                          * So the frame isn't mgmt, but frame_control
1406                          * is at the right place anyway, of course, so
1407                          * the if statement is correct.
1408                          *
1409                          * Warn if we have other data frame types here,
1410                          * they must not get here.
1411                          */
1412                         WARN_ON(hdr->frame_control &
1413                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1414                         WARN_ON(!(hdr->seq_ctrl &
1415                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1416                         /*
1417                          * This was a fragment of a frame, received while
1418                          * a block-ack session was active. That cannot be
1419                          * right, so terminate the session.
1420                          */
1421                         mutex_lock(&local->sta_mtx);
1422                         sta = sta_info_get_bss(sdata, mgmt->sa);
1423                         if (sta) {
1424                                 u16 tid = ieee80211_get_tid(hdr);
1425
1426                                 __ieee80211_stop_rx_ba_session(
1427                                         sta, tid, WLAN_BACK_RECIPIENT,
1428                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1429                                         true);
1430                         }
1431                         mutex_unlock(&local->sta_mtx);
1432                 } else switch (sdata->vif.type) {
1433                 case NL80211_IFTYPE_STATION:
1434                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1435                         break;
1436                 case NL80211_IFTYPE_ADHOC:
1437                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1438                         break;
1439                 case NL80211_IFTYPE_MESH_POINT:
1440                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1441                                 break;
1442                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1443                         break;
1444                 default:
1445                         WARN(1, "frame for unexpected interface type");
1446                         break;
1447                 }
1448
1449                 kfree_skb(skb);
1450                 kcov_remote_stop();
1451         }
1452
1453         /* then other type-dependent work */
1454         switch (sdata->vif.type) {
1455         case NL80211_IFTYPE_STATION:
1456                 ieee80211_sta_work(sdata);
1457                 break;
1458         case NL80211_IFTYPE_ADHOC:
1459                 ieee80211_ibss_work(sdata);
1460                 break;
1461         case NL80211_IFTYPE_MESH_POINT:
1462                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1463                         break;
1464                 ieee80211_mesh_work(sdata);
1465                 break;
1466         case NL80211_IFTYPE_OCB:
1467                 ieee80211_ocb_work(sdata);
1468                 break;
1469         default:
1470                 break;
1471         }
1472 }
1473
1474 static void ieee80211_recalc_smps_work(struct work_struct *work)
1475 {
1476         struct ieee80211_sub_if_data *sdata =
1477                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1478
1479         ieee80211_recalc_smps(sdata);
1480 }
1481
1482 /*
1483  * Helper function to initialise an interface to a specific type.
1484  */
1485 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1486                                   enum nl80211_iftype type)
1487 {
1488         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1489                                                     0xff, 0xff, 0xff};
1490
1491         /* clear type-dependent union */
1492         memset(&sdata->u, 0, sizeof(sdata->u));
1493
1494         /* and set some type-dependent values */
1495         sdata->vif.type = type;
1496         sdata->vif.p2p = false;
1497         sdata->wdev.iftype = type;
1498
1499         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1500         sdata->control_port_no_encrypt = false;
1501         sdata->control_port_over_nl80211 = false;
1502         sdata->control_port_no_preauth = false;
1503         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1504         sdata->vif.bss_conf.idle = true;
1505         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1506
1507         sdata->noack_map = 0;
1508
1509         /* only monitor/p2p-device differ */
1510         if (sdata->dev) {
1511                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1512                 sdata->dev->type = ARPHRD_ETHER;
1513         }
1514
1515         skb_queue_head_init(&sdata->skb_queue);
1516         INIT_WORK(&sdata->work, ieee80211_iface_work);
1517         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1518         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1519         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1520         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1521
1522         switch (type) {
1523         case NL80211_IFTYPE_P2P_GO:
1524                 type = NL80211_IFTYPE_AP;
1525                 sdata->vif.type = type;
1526                 sdata->vif.p2p = true;
1527                 fallthrough;
1528         case NL80211_IFTYPE_AP:
1529                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1530                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1531                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1532                 break;
1533         case NL80211_IFTYPE_P2P_CLIENT:
1534                 type = NL80211_IFTYPE_STATION;
1535                 sdata->vif.type = type;
1536                 sdata->vif.p2p = true;
1537                 fallthrough;
1538         case NL80211_IFTYPE_STATION:
1539                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1540                 ieee80211_sta_setup_sdata(sdata);
1541                 break;
1542         case NL80211_IFTYPE_OCB:
1543                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1544                 ieee80211_ocb_setup_sdata(sdata);
1545                 break;
1546         case NL80211_IFTYPE_ADHOC:
1547                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1548                 ieee80211_ibss_setup_sdata(sdata);
1549                 break;
1550         case NL80211_IFTYPE_MESH_POINT:
1551                 if (ieee80211_vif_is_mesh(&sdata->vif))
1552                         ieee80211_mesh_init_sdata(sdata);
1553                 break;
1554         case NL80211_IFTYPE_MONITOR:
1555                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1556                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1557                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1558                                       MONITOR_FLAG_OTHER_BSS;
1559                 break;
1560         case NL80211_IFTYPE_NAN:
1561                 idr_init(&sdata->u.nan.function_inst_ids);
1562                 spin_lock_init(&sdata->u.nan.func_lock);
1563                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1564                 break;
1565         case NL80211_IFTYPE_AP_VLAN:
1566         case NL80211_IFTYPE_P2P_DEVICE:
1567                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1568                 break;
1569         case NL80211_IFTYPE_UNSPECIFIED:
1570         case NL80211_IFTYPE_WDS:
1571         case NUM_NL80211_IFTYPES:
1572                 WARN_ON(1);
1573                 break;
1574         }
1575
1576         ieee80211_debugfs_add_netdev(sdata);
1577 }
1578
1579 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1580                                            enum nl80211_iftype type)
1581 {
1582         struct ieee80211_local *local = sdata->local;
1583         int ret, err;
1584         enum nl80211_iftype internal_type = type;
1585         bool p2p = false;
1586
1587         ASSERT_RTNL();
1588
1589         if (!local->ops->change_interface)
1590                 return -EBUSY;
1591
1592         switch (sdata->vif.type) {
1593         case NL80211_IFTYPE_AP:
1594         case NL80211_IFTYPE_STATION:
1595         case NL80211_IFTYPE_ADHOC:
1596         case NL80211_IFTYPE_OCB:
1597                 /*
1598                  * Could maybe also all others here?
1599                  * Just not sure how that interacts
1600                  * with the RX/config path e.g. for
1601                  * mesh.
1602                  */
1603                 break;
1604         default:
1605                 return -EBUSY;
1606         }
1607
1608         switch (type) {
1609         case NL80211_IFTYPE_AP:
1610         case NL80211_IFTYPE_STATION:
1611         case NL80211_IFTYPE_ADHOC:
1612         case NL80211_IFTYPE_OCB:
1613                 /*
1614                  * Could probably support everything
1615                  * but here.
1616                  */
1617                 break;
1618         case NL80211_IFTYPE_P2P_CLIENT:
1619                 p2p = true;
1620                 internal_type = NL80211_IFTYPE_STATION;
1621                 break;
1622         case NL80211_IFTYPE_P2P_GO:
1623                 p2p = true;
1624                 internal_type = NL80211_IFTYPE_AP;
1625                 break;
1626         default:
1627                 return -EBUSY;
1628         }
1629
1630         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1631         if (ret)
1632                 return ret;
1633
1634         ieee80211_stop_vif_queues(local, sdata,
1635                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1636         synchronize_net();
1637
1638         ieee80211_do_stop(sdata, false);
1639
1640         ieee80211_teardown_sdata(sdata);
1641
1642         ieee80211_set_sdata_offload_flags(sdata);
1643         ret = drv_change_interface(local, sdata, internal_type, p2p);
1644         if (ret)
1645                 type = ieee80211_vif_type_p2p(&sdata->vif);
1646
1647         /*
1648          * Ignore return value here, there's not much we can do since
1649          * the driver changed the interface type internally already.
1650          * The warnings will hopefully make driver authors fix it :-)
1651          */
1652         ieee80211_check_queues(sdata, type);
1653
1654         ieee80211_setup_sdata(sdata, type);
1655         ieee80211_set_vif_encap_ops(sdata);
1656
1657         err = ieee80211_do_open(&sdata->wdev, false);
1658         WARN(err, "type change: do_open returned %d", err);
1659
1660         ieee80211_wake_vif_queues(local, sdata,
1661                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1662         return ret;
1663 }
1664
1665 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1666                              enum nl80211_iftype type)
1667 {
1668         int ret;
1669
1670         ASSERT_RTNL();
1671
1672         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1673                 return 0;
1674
1675         if (ieee80211_sdata_running(sdata)) {
1676                 ret = ieee80211_runtime_change_iftype(sdata, type);
1677                 if (ret)
1678                         return ret;
1679         } else {
1680                 /* Purge and reset type-dependent state. */
1681                 ieee80211_teardown_sdata(sdata);
1682                 ieee80211_setup_sdata(sdata, type);
1683         }
1684
1685         /* reset some values that shouldn't be kept across type changes */
1686         if (type == NL80211_IFTYPE_STATION)
1687                 sdata->u.mgd.use_4addr = false;
1688
1689         return 0;
1690 }
1691
1692 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1693                                        u8 *perm_addr, enum nl80211_iftype type)
1694 {
1695         struct ieee80211_sub_if_data *sdata;
1696         u64 mask, start, addr, val, inc;
1697         u8 *m;
1698         u8 tmp_addr[ETH_ALEN];
1699         int i;
1700
1701         /* default ... something at least */
1702         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1703
1704         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1705             local->hw.wiphy->n_addresses <= 1)
1706                 return;
1707
1708         mutex_lock(&local->iflist_mtx);
1709
1710         switch (type) {
1711         case NL80211_IFTYPE_MONITOR:
1712                 /* doesn't matter */
1713                 break;
1714         case NL80211_IFTYPE_AP_VLAN:
1715                 /* match up with an AP interface */
1716                 list_for_each_entry(sdata, &local->interfaces, list) {
1717                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1718                                 continue;
1719                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1720                         break;
1721                 }
1722                 /* keep default if no AP interface present */
1723                 break;
1724         case NL80211_IFTYPE_P2P_CLIENT:
1725         case NL80211_IFTYPE_P2P_GO:
1726                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1727                         list_for_each_entry(sdata, &local->interfaces, list) {
1728                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1729                                         continue;
1730                                 if (!ieee80211_sdata_running(sdata))
1731                                         continue;
1732                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1733                                 goto out_unlock;
1734                         }
1735                 }
1736                 fallthrough;
1737         default:
1738                 /* assign a new address if possible -- try n_addresses first */
1739                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1740                         bool used = false;
1741
1742                         list_for_each_entry(sdata, &local->interfaces, list) {
1743                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1744                                                      sdata->vif.addr)) {
1745                                         used = true;
1746                                         break;
1747                                 }
1748                         }
1749
1750                         if (!used) {
1751                                 memcpy(perm_addr,
1752                                        local->hw.wiphy->addresses[i].addr,
1753                                        ETH_ALEN);
1754                                 break;
1755                         }
1756                 }
1757
1758                 /* try mask if available */
1759                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1760                         break;
1761
1762                 m = local->hw.wiphy->addr_mask;
1763                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1764                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1765                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1766
1767                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1768                         /* not a contiguous mask ... not handled now! */
1769                         pr_info("not contiguous\n");
1770                         break;
1771                 }
1772
1773                 /*
1774                  * Pick address of existing interface in case user changed
1775                  * MAC address manually, default to perm_addr.
1776                  */
1777                 m = local->hw.wiphy->perm_addr;
1778                 list_for_each_entry(sdata, &local->interfaces, list) {
1779                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1780                                 continue;
1781                         m = sdata->vif.addr;
1782                         break;
1783                 }
1784                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1785                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1786                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1787
1788                 inc = 1ULL<<__ffs64(mask);
1789                 val = (start & mask);
1790                 addr = (start & ~mask) | (val & mask);
1791                 do {
1792                         bool used = false;
1793
1794                         tmp_addr[5] = addr >> 0*8;
1795                         tmp_addr[4] = addr >> 1*8;
1796                         tmp_addr[3] = addr >> 2*8;
1797                         tmp_addr[2] = addr >> 3*8;
1798                         tmp_addr[1] = addr >> 4*8;
1799                         tmp_addr[0] = addr >> 5*8;
1800
1801                         val += inc;
1802
1803                         list_for_each_entry(sdata, &local->interfaces, list) {
1804                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1805                                         used = true;
1806                                         break;
1807                                 }
1808                         }
1809
1810                         if (!used) {
1811                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1812                                 break;
1813                         }
1814                         addr = (start & ~mask) | (val & mask);
1815                 } while (addr != start);
1816
1817                 break;
1818         }
1819
1820  out_unlock:
1821         mutex_unlock(&local->iflist_mtx);
1822 }
1823
1824 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1825                      unsigned char name_assign_type,
1826                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1827                      struct vif_params *params)
1828 {
1829         struct net_device *ndev = NULL;
1830         struct ieee80211_sub_if_data *sdata = NULL;
1831         struct txq_info *txqi;
1832         void (*if_setup)(struct net_device *dev);
1833         int ret, i;
1834         int txqs = 1;
1835
1836         ASSERT_RTNL();
1837
1838         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1839                 struct wireless_dev *wdev;
1840
1841                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1842                                 GFP_KERNEL);
1843                 if (!sdata)
1844                         return -ENOMEM;
1845                 wdev = &sdata->wdev;
1846
1847                 sdata->dev = NULL;
1848                 strlcpy(sdata->name, name, IFNAMSIZ);
1849                 ieee80211_assign_perm_addr(local, wdev->address, type);
1850                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1851         } else {
1852                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1853                                  sizeof(void *));
1854                 int txq_size = 0;
1855
1856                 if (local->ops->wake_tx_queue &&
1857                     type != NL80211_IFTYPE_AP_VLAN &&
1858                     (type != NL80211_IFTYPE_MONITOR ||
1859                      (params->flags & MONITOR_FLAG_ACTIVE)))
1860                         txq_size += sizeof(struct txq_info) +
1861                                     local->hw.txq_data_size;
1862
1863                 if (local->ops->wake_tx_queue) {
1864                         if_setup = ieee80211_if_setup_no_queue;
1865                 } else {
1866                         if_setup = ieee80211_if_setup;
1867                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1868                                 txqs = IEEE80211_NUM_ACS;
1869                 }
1870
1871                 ndev = alloc_netdev_mqs(size + txq_size,
1872                                         name, name_assign_type,
1873                                         if_setup, txqs, 1);
1874                 if (!ndev)
1875                         return -ENOMEM;
1876
1877                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1878                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1879
1880                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1881
1882                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1883                 if (!ndev->tstats) {
1884                         free_netdev(ndev);
1885                         return -ENOMEM;
1886                 }
1887
1888                 ndev->needed_headroom = local->tx_headroom +
1889                                         4*6 /* four MAC addresses */
1890                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1891                                         + 6 /* mesh */
1892                                         + 8 /* rfc1042/bridge tunnel */
1893                                         - ETH_HLEN /* ethernet hard_header_len */
1894                                         + IEEE80211_ENCRYPT_HEADROOM;
1895                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1896
1897                 ret = dev_alloc_name(ndev, ndev->name);
1898                 if (ret < 0) {
1899                         ieee80211_if_free(ndev);
1900                         free_netdev(ndev);
1901                         return ret;
1902                 }
1903
1904                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1905                 if (is_valid_ether_addr(params->macaddr))
1906                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1907                 else
1908                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1909                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1910
1911                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1912                 sdata = netdev_priv(ndev);
1913                 ndev->ieee80211_ptr = &sdata->wdev;
1914                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1915                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1916
1917                 if (txq_size) {
1918                         txqi = netdev_priv(ndev) + size;
1919                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1920                 }
1921
1922                 sdata->dev = ndev;
1923         }
1924
1925         /* initialise type-independent data */
1926         sdata->wdev.wiphy = local->hw.wiphy;
1927         sdata->local = local;
1928
1929         ieee80211_init_frag_cache(&sdata->frags);
1930
1931         INIT_LIST_HEAD(&sdata->key_list);
1932
1933         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1934                           ieee80211_dfs_cac_timer_work);
1935         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1936                           ieee80211_delayed_tailroom_dec);
1937
1938         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1939                 struct ieee80211_supported_band *sband;
1940                 sband = local->hw.wiphy->bands[i];
1941                 sdata->rc_rateidx_mask[i] =
1942                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1943                 if (sband) {
1944                         __le16 cap;
1945                         u16 *vht_rate_mask;
1946
1947                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1948                                sband->ht_cap.mcs.rx_mask,
1949                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1950
1951                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1952                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1953                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1954                 } else {
1955                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1956                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1957                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1958                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1959                 }
1960         }
1961
1962         ieee80211_set_default_queues(sdata);
1963
1964         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1965         sdata->user_power_level = local->user_power_level;
1966
1967         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1968
1969         /* setup type-dependent data */
1970         ieee80211_setup_sdata(sdata, type);
1971
1972         if (ndev) {
1973                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1974                 if (type == NL80211_IFTYPE_STATION)
1975                         sdata->u.mgd.use_4addr = params->use_4addr;
1976
1977                 ndev->features |= local->hw.netdev_features;
1978                 ndev->hw_features |= ndev->features &
1979                                         MAC80211_SUPPORTED_FEATURES_TX;
1980
1981                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1982
1983                 /* MTU range: 256 - 2304 */
1984                 ndev->min_mtu = 256;
1985                 ndev->max_mtu = local->hw.max_mtu;
1986
1987                 ret = cfg80211_register_netdevice(ndev);
1988                 if (ret) {
1989                         free_netdev(ndev);
1990                         return ret;
1991                 }
1992         }
1993
1994         mutex_lock(&local->iflist_mtx);
1995         list_add_tail_rcu(&sdata->list, &local->interfaces);
1996         mutex_unlock(&local->iflist_mtx);
1997
1998         if (new_wdev)
1999                 *new_wdev = &sdata->wdev;
2000
2001         return 0;
2002 }
2003
2004 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2005 {
2006         ASSERT_RTNL();
2007
2008         mutex_lock(&sdata->local->iflist_mtx);
2009         list_del_rcu(&sdata->list);
2010         mutex_unlock(&sdata->local->iflist_mtx);
2011
2012         if (sdata->vif.txq)
2013                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2014
2015         synchronize_rcu();
2016
2017         cfg80211_unregister_wdev(&sdata->wdev);
2018
2019         if (!sdata->dev) {
2020                 ieee80211_teardown_sdata(sdata);
2021                 kfree(sdata);
2022         }
2023 }
2024
2025 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2026 {
2027         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2028                 return;
2029         ieee80211_do_stop(sdata, true);
2030 }
2031
2032 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2033 {
2034         struct ieee80211_sub_if_data *sdata, *tmp;
2035         LIST_HEAD(unreg_list);
2036         LIST_HEAD(wdev_list);
2037
2038         ASSERT_RTNL();
2039
2040         /* Before destroying the interfaces, make sure they're all stopped so
2041          * that the hardware is stopped. Otherwise, the driver might still be
2042          * iterating the interfaces during the shutdown, e.g. from a worker
2043          * or from RX processing or similar, and if it does so (using atomic
2044          * iteration) while we're manipulating the list, the iteration will
2045          * crash.
2046          *
2047          * After this, the hardware should be stopped and the driver should
2048          * have stopped all of its activities, so that we can do RCU-unaware
2049          * manipulations of the interface list below.
2050          */
2051         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2052
2053         WARN(local->open_count, "%s: open count remains %d\n",
2054              wiphy_name(local->hw.wiphy), local->open_count);
2055
2056         ieee80211_txq_teardown_flows(local);
2057
2058         mutex_lock(&local->iflist_mtx);
2059         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2060                 list_del(&sdata->list);
2061
2062                 if (sdata->dev)
2063                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2064                 else
2065                         list_add(&sdata->list, &wdev_list);
2066         }
2067         mutex_unlock(&local->iflist_mtx);
2068
2069         unregister_netdevice_many(&unreg_list);
2070
2071         wiphy_lock(local->hw.wiphy);
2072         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2073                 list_del(&sdata->list);
2074                 cfg80211_unregister_wdev(&sdata->wdev);
2075                 kfree(sdata);
2076         }
2077         wiphy_unlock(local->hw.wiphy);
2078 }
2079
2080 static int netdev_notify(struct notifier_block *nb,
2081                          unsigned long state, void *ptr)
2082 {
2083         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2084         struct ieee80211_sub_if_data *sdata;
2085
2086         if (state != NETDEV_CHANGENAME)
2087                 return NOTIFY_DONE;
2088
2089         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2090                 return NOTIFY_DONE;
2091
2092         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2093                 return NOTIFY_DONE;
2094
2095         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2096         memcpy(sdata->name, dev->name, IFNAMSIZ);
2097         ieee80211_debugfs_rename_netdev(sdata);
2098
2099         return NOTIFY_OK;
2100 }
2101
2102 static struct notifier_block mac80211_netdev_notifier = {
2103         .notifier_call = netdev_notify,
2104 };
2105
2106 int ieee80211_iface_init(void)
2107 {
2108         return register_netdevice_notifier(&mac80211_netdev_notifier);
2109 }
2110
2111 void ieee80211_iface_exit(void)
2112 {
2113         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2114 }
2115
2116 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2117 {
2118         if (sdata->vif.type == NL80211_IFTYPE_AP)
2119                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2120         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2121                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2122 }
2123
2124 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2125 {
2126         if (sdata->vif.type == NL80211_IFTYPE_AP)
2127                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2128         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2129                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2130 }