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) 2018-2020 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 int i;
683
684 /* free extra data */
685 ieee80211_free_keys(sdata, false);
686
687 ieee80211_debugfs_remove_netdev(sdata);
688
689 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
690 __skb_queue_purge(&sdata->fragments[i].skb_list);
691 sdata->fragment_next = 0;
692
693 if (ieee80211_vif_is_mesh(&sdata->vif))
694 ieee80211_mesh_teardown_sdata(sdata);
695 }
696
ieee80211_uninit(struct net_device * dev)697 static void ieee80211_uninit(struct net_device *dev)
698 {
699 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
700 }
701
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)702 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
703 struct sk_buff *skb,
704 struct net_device *sb_dev)
705 {
706 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
707 }
708
709 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)710 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
711 {
712 dev_fetch_sw_netstats(stats, dev->tstats);
713 }
714
715 static const struct net_device_ops ieee80211_dataif_ops = {
716 .ndo_open = ieee80211_open,
717 .ndo_stop = ieee80211_stop,
718 .ndo_uninit = ieee80211_uninit,
719 .ndo_start_xmit = ieee80211_subif_start_xmit,
720 .ndo_set_rx_mode = ieee80211_set_multicast_list,
721 .ndo_set_mac_address = ieee80211_change_mac,
722 .ndo_select_queue = ieee80211_netdev_select_queue,
723 .ndo_get_stats64 = ieee80211_get_stats64,
724 };
725
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)726 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
727 struct sk_buff *skb,
728 struct net_device *sb_dev)
729 {
730 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
731 struct ieee80211_local *local = sdata->local;
732 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
733 struct ieee80211_hdr *hdr;
734 int len_rthdr;
735
736 if (local->hw.queues < IEEE80211_NUM_ACS)
737 return 0;
738
739 /* reset flags and info before parsing radiotap header */
740 memset(info, 0, sizeof(*info));
741
742 if (!ieee80211_parse_tx_radiotap(skb, dev))
743 return 0; /* doesn't matter, frame will be dropped */
744
745 len_rthdr = ieee80211_get_radiotap_len(skb->data);
746 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
747 if (skb->len < len_rthdr + 2 ||
748 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
749 return 0; /* doesn't matter, frame will be dropped */
750
751 return ieee80211_select_queue_80211(sdata, skb, hdr);
752 }
753
754 static const struct net_device_ops ieee80211_monitorif_ops = {
755 .ndo_open = ieee80211_open,
756 .ndo_stop = ieee80211_stop,
757 .ndo_uninit = ieee80211_uninit,
758 .ndo_start_xmit = ieee80211_monitor_start_xmit,
759 .ndo_set_rx_mode = ieee80211_set_multicast_list,
760 .ndo_set_mac_address = ieee80211_change_mac,
761 .ndo_select_queue = ieee80211_monitor_select_queue,
762 .ndo_get_stats64 = ieee80211_get_stats64,
763 };
764
765 static const struct net_device_ops ieee80211_dataif_8023_ops = {
766 .ndo_open = ieee80211_open,
767 .ndo_stop = ieee80211_stop,
768 .ndo_uninit = ieee80211_uninit,
769 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
770 .ndo_set_rx_mode = ieee80211_set_multicast_list,
771 .ndo_set_mac_address = ieee80211_change_mac,
772 .ndo_select_queue = ieee80211_netdev_select_queue,
773 .ndo_get_stats64 = ieee80211_get_stats64,
774 };
775
ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)776 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
777 {
778 switch (iftype) {
779 /* P2P GO and client are mapped to AP/STATION types */
780 case NL80211_IFTYPE_AP:
781 case NL80211_IFTYPE_STATION:
782 return true;
783 default:
784 return false;
785 }
786 }
787
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)788 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
789 {
790 struct ieee80211_local *local = sdata->local;
791 u32 flags;
792
793 flags = sdata->vif.offload_flags;
794
795 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
796 ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
797 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
798
799 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
800 local->hw.wiphy->frag_threshold != (u32)-1)
801 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
802
803 if (local->monitors)
804 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
805 } else {
806 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
807 }
808
809 if (sdata->vif.offload_flags == flags)
810 return false;
811
812 sdata->vif.offload_flags = flags;
813 return true;
814 }
815
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)816 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
817 {
818 struct ieee80211_local *local = sdata->local;
819 struct ieee80211_sub_if_data *bss = sdata;
820 bool enabled;
821
822 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
823 if (!sdata->bss)
824 return;
825
826 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
827 }
828
829 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
830 !ieee80211_iftype_supports_encap_offload(bss->vif.type))
831 return;
832
833 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
834 if (sdata->wdev.use_4addr &&
835 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
836 enabled = false;
837
838 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
839 &ieee80211_dataif_ops;
840 }
841
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)842 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
843 {
844 struct ieee80211_local *local = sdata->local;
845 struct ieee80211_sub_if_data *vsdata;
846
847 if (ieee80211_set_sdata_offload_flags(sdata)) {
848 drv_update_vif_offload(local, sdata);
849 ieee80211_set_vif_encap_ops(sdata);
850 }
851
852 list_for_each_entry(vsdata, &local->interfaces, list) {
853 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
854 vsdata->bss != &sdata->u.ap)
855 continue;
856
857 ieee80211_set_vif_encap_ops(vsdata);
858 }
859 }
860
ieee80211_recalc_offload(struct ieee80211_local * local)861 void ieee80211_recalc_offload(struct ieee80211_local *local)
862 {
863 struct ieee80211_sub_if_data *sdata;
864
865 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
866 return;
867
868 mutex_lock(&local->iflist_mtx);
869
870 list_for_each_entry(sdata, &local->interfaces, list) {
871 if (!ieee80211_sdata_running(sdata))
872 continue;
873
874 ieee80211_recalc_sdata_offload(sdata);
875 }
876
877 mutex_unlock(&local->iflist_mtx);
878 }
879
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)880 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
881 const int offset)
882 {
883 struct ieee80211_local *local = sdata->local;
884 u32 flags = sdata->u.mntr.flags;
885
886 #define ADJUST(_f, _s) do { \
887 if (flags & MONITOR_FLAG_##_f) \
888 local->fif_##_s += offset; \
889 } while (0)
890
891 ADJUST(FCSFAIL, fcsfail);
892 ADJUST(PLCPFAIL, plcpfail);
893 ADJUST(CONTROL, control);
894 ADJUST(CONTROL, pspoll);
895 ADJUST(OTHER_BSS, other_bss);
896
897 #undef ADJUST
898 }
899
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)900 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
901 {
902 struct ieee80211_local *local = sdata->local;
903 int i;
904
905 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
906 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
907 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
908 else if (local->hw.queues >= IEEE80211_NUM_ACS)
909 sdata->vif.hw_queue[i] = i;
910 else
911 sdata->vif.hw_queue[i] = 0;
912 }
913 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
914 }
915
ieee80211_add_virtual_monitor(struct ieee80211_local * local)916 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
917 {
918 struct ieee80211_sub_if_data *sdata;
919 int ret;
920
921 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
922 return 0;
923
924 ASSERT_RTNL();
925
926 if (local->monitor_sdata)
927 return 0;
928
929 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
930 if (!sdata)
931 return -ENOMEM;
932
933 /* set up data */
934 sdata->local = local;
935 sdata->vif.type = NL80211_IFTYPE_MONITOR;
936 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
937 wiphy_name(local->hw.wiphy));
938 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
939
940 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
941
942 ieee80211_set_default_queues(sdata);
943
944 ret = drv_add_interface(local, sdata);
945 if (WARN_ON(ret)) {
946 /* ok .. stupid driver, it asked for this! */
947 kfree(sdata);
948 return ret;
949 }
950
951 set_bit(SDATA_STATE_RUNNING, &sdata->state);
952
953 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
954 if (ret) {
955 kfree(sdata);
956 return ret;
957 }
958
959 mutex_lock(&local->iflist_mtx);
960 rcu_assign_pointer(local->monitor_sdata, sdata);
961 mutex_unlock(&local->iflist_mtx);
962
963 mutex_lock(&local->mtx);
964 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
965 IEEE80211_CHANCTX_EXCLUSIVE);
966 mutex_unlock(&local->mtx);
967 if (ret) {
968 mutex_lock(&local->iflist_mtx);
969 RCU_INIT_POINTER(local->monitor_sdata, NULL);
970 mutex_unlock(&local->iflist_mtx);
971 synchronize_net();
972 drv_remove_interface(local, sdata);
973 kfree(sdata);
974 return ret;
975 }
976
977 skb_queue_head_init(&sdata->skb_queue);
978 INIT_WORK(&sdata->work, ieee80211_iface_work);
979
980 return 0;
981 }
982
ieee80211_del_virtual_monitor(struct ieee80211_local * local)983 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
984 {
985 struct ieee80211_sub_if_data *sdata;
986
987 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
988 return;
989
990 ASSERT_RTNL();
991
992 mutex_lock(&local->iflist_mtx);
993
994 sdata = rcu_dereference_protected(local->monitor_sdata,
995 lockdep_is_held(&local->iflist_mtx));
996 if (!sdata) {
997 mutex_unlock(&local->iflist_mtx);
998 return;
999 }
1000
1001 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1002 mutex_unlock(&local->iflist_mtx);
1003
1004 synchronize_net();
1005
1006 mutex_lock(&local->mtx);
1007 ieee80211_vif_release_channel(sdata);
1008 mutex_unlock(&local->mtx);
1009
1010 drv_remove_interface(local, sdata);
1011
1012 kfree(sdata);
1013 }
1014
1015 /*
1016 * NOTE: Be very careful when changing this function, it must NOT return
1017 * an error on interface type changes that have been pre-checked, so most
1018 * checks should be in ieee80211_check_concurrent_iface.
1019 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1020 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1021 {
1022 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1023 struct net_device *dev = wdev->netdev;
1024 struct ieee80211_local *local = sdata->local;
1025 struct sta_info *sta;
1026 u32 changed = 0;
1027 int res;
1028 u32 hw_reconf_flags = 0;
1029
1030 switch (sdata->vif.type) {
1031 case NL80211_IFTYPE_WDS:
1032 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
1033 return -ENOLINK;
1034 break;
1035 case NL80211_IFTYPE_AP_VLAN: {
1036 struct ieee80211_sub_if_data *master;
1037
1038 if (!sdata->bss)
1039 return -ENOLINK;
1040
1041 mutex_lock(&local->mtx);
1042 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1043 mutex_unlock(&local->mtx);
1044
1045 master = container_of(sdata->bss,
1046 struct ieee80211_sub_if_data, u.ap);
1047 sdata->control_port_protocol =
1048 master->control_port_protocol;
1049 sdata->control_port_no_encrypt =
1050 master->control_port_no_encrypt;
1051 sdata->control_port_over_nl80211 =
1052 master->control_port_over_nl80211;
1053 sdata->control_port_no_preauth =
1054 master->control_port_no_preauth;
1055 sdata->vif.cab_queue = master->vif.cab_queue;
1056 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1057 sizeof(sdata->vif.hw_queue));
1058 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1059
1060 mutex_lock(&local->key_mtx);
1061 sdata->crypto_tx_tailroom_needed_cnt +=
1062 master->crypto_tx_tailroom_needed_cnt;
1063 mutex_unlock(&local->key_mtx);
1064
1065 break;
1066 }
1067 case NL80211_IFTYPE_AP:
1068 sdata->bss = &sdata->u.ap;
1069 break;
1070 case NL80211_IFTYPE_MESH_POINT:
1071 case NL80211_IFTYPE_STATION:
1072 case NL80211_IFTYPE_MONITOR:
1073 case NL80211_IFTYPE_ADHOC:
1074 case NL80211_IFTYPE_P2P_DEVICE:
1075 case NL80211_IFTYPE_OCB:
1076 case NL80211_IFTYPE_NAN:
1077 /* no special treatment */
1078 break;
1079 case NL80211_IFTYPE_UNSPECIFIED:
1080 case NUM_NL80211_IFTYPES:
1081 case NL80211_IFTYPE_P2P_CLIENT:
1082 case NL80211_IFTYPE_P2P_GO:
1083 /* cannot happen */
1084 WARN_ON(1);
1085 break;
1086 }
1087
1088 if (local->open_count == 0) {
1089 res = drv_start(local);
1090 if (res)
1091 goto err_del_bss;
1092 /* we're brought up, everything changes */
1093 hw_reconf_flags = ~0;
1094 ieee80211_led_radio(local, true);
1095 ieee80211_mod_tpt_led_trig(local,
1096 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1097 }
1098
1099 /*
1100 * Copy the hopefully now-present MAC address to
1101 * this interface, if it has the special null one.
1102 */
1103 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1104 memcpy(dev->dev_addr,
1105 local->hw.wiphy->perm_addr,
1106 ETH_ALEN);
1107 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1108
1109 if (!is_valid_ether_addr(dev->dev_addr)) {
1110 res = -EADDRNOTAVAIL;
1111 goto err_stop;
1112 }
1113 }
1114
1115 switch (sdata->vif.type) {
1116 case NL80211_IFTYPE_AP_VLAN:
1117 /* no need to tell driver, but set carrier and chanctx */
1118 if (rtnl_dereference(sdata->bss->beacon)) {
1119 ieee80211_vif_vlan_copy_chanctx(sdata);
1120 netif_carrier_on(dev);
1121 ieee80211_set_vif_encap_ops(sdata);
1122 } else {
1123 netif_carrier_off(dev);
1124 }
1125 break;
1126 case NL80211_IFTYPE_MONITOR:
1127 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1128 local->cooked_mntrs++;
1129 break;
1130 }
1131
1132 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1133 res = drv_add_interface(local, sdata);
1134 if (res)
1135 goto err_stop;
1136 } else if (local->monitors == 0 && local->open_count == 0) {
1137 res = ieee80211_add_virtual_monitor(local);
1138 if (res)
1139 goto err_stop;
1140 }
1141
1142 /* must be before the call to ieee80211_configure_filter */
1143 local->monitors++;
1144 if (local->monitors == 1) {
1145 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1146 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1147 }
1148
1149 ieee80211_adjust_monitor_flags(sdata, 1);
1150 ieee80211_configure_filter(local);
1151 ieee80211_recalc_offload(local);
1152 mutex_lock(&local->mtx);
1153 ieee80211_recalc_idle(local);
1154 mutex_unlock(&local->mtx);
1155
1156 netif_carrier_on(dev);
1157 break;
1158 default:
1159 if (coming_up) {
1160 ieee80211_del_virtual_monitor(local);
1161 ieee80211_set_sdata_offload_flags(sdata);
1162
1163 res = drv_add_interface(local, sdata);
1164 if (res)
1165 goto err_stop;
1166
1167 ieee80211_set_vif_encap_ops(sdata);
1168 res = ieee80211_check_queues(sdata,
1169 ieee80211_vif_type_p2p(&sdata->vif));
1170 if (res)
1171 goto err_del_interface;
1172 }
1173
1174 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1175 local->fif_pspoll++;
1176 local->fif_probe_req++;
1177
1178 ieee80211_configure_filter(local);
1179 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1180 local->fif_probe_req++;
1181 }
1182
1183 if (sdata->vif.probe_req_reg)
1184 drv_config_iface_filter(local, sdata,
1185 FIF_PROBE_REQ,
1186 FIF_PROBE_REQ);
1187
1188 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1189 sdata->vif.type != NL80211_IFTYPE_NAN)
1190 changed |= ieee80211_reset_erp_info(sdata);
1191 ieee80211_bss_info_change_notify(sdata, changed);
1192
1193 switch (sdata->vif.type) {
1194 case NL80211_IFTYPE_STATION:
1195 case NL80211_IFTYPE_ADHOC:
1196 case NL80211_IFTYPE_AP:
1197 case NL80211_IFTYPE_MESH_POINT:
1198 case NL80211_IFTYPE_OCB:
1199 netif_carrier_off(dev);
1200 break;
1201 case NL80211_IFTYPE_WDS:
1202 case NL80211_IFTYPE_P2P_DEVICE:
1203 case NL80211_IFTYPE_NAN:
1204 break;
1205 default:
1206 /* not reached */
1207 WARN_ON(1);
1208 }
1209
1210 /*
1211 * Set default queue parameters so drivers don't
1212 * need to initialise the hardware if the hardware
1213 * doesn't start up with sane defaults.
1214 * Enable QoS for anything but station interfaces.
1215 */
1216 ieee80211_set_wmm_default(sdata, true,
1217 sdata->vif.type != NL80211_IFTYPE_STATION);
1218 }
1219
1220 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1221
1222 switch (sdata->vif.type) {
1223 case NL80211_IFTYPE_WDS:
1224 /* Create STA entry for the WDS peer */
1225 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
1226 GFP_KERNEL);
1227 if (!sta) {
1228 res = -ENOMEM;
1229 goto err_del_interface;
1230 }
1231
1232 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
1233 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
1234 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
1235
1236 res = sta_info_insert(sta);
1237 if (res) {
1238 /* STA has been freed */
1239 goto err_del_interface;
1240 }
1241
1242 rate_control_rate_init(sta);
1243 netif_carrier_on(dev);
1244 break;
1245 case NL80211_IFTYPE_P2P_DEVICE:
1246 rcu_assign_pointer(local->p2p_sdata, sdata);
1247 break;
1248 case NL80211_IFTYPE_MONITOR:
1249 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1250 break;
1251 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1252 break;
1253 default:
1254 break;
1255 }
1256
1257 /*
1258 * set_multicast_list will be invoked by the networking core
1259 * which will check whether any increments here were done in
1260 * error and sync them down to the hardware as filter flags.
1261 */
1262 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1263 atomic_inc(&local->iff_allmultis);
1264
1265 if (coming_up)
1266 local->open_count++;
1267
1268 if (hw_reconf_flags)
1269 ieee80211_hw_config(local, hw_reconf_flags);
1270
1271 ieee80211_recalc_ps(local);
1272
1273 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1274 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1275 local->ops->wake_tx_queue) {
1276 /* XXX: for AP_VLAN, actually track AP queues */
1277 if (dev)
1278 netif_tx_start_all_queues(dev);
1279 } else if (dev) {
1280 unsigned long flags;
1281 int n_acs = IEEE80211_NUM_ACS;
1282 int ac;
1283
1284 if (local->hw.queues < IEEE80211_NUM_ACS)
1285 n_acs = 1;
1286
1287 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1288 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1289 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1290 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1291 for (ac = 0; ac < n_acs; ac++) {
1292 int ac_queue = sdata->vif.hw_queue[ac];
1293
1294 if (local->queue_stop_reasons[ac_queue] == 0 &&
1295 skb_queue_empty(&local->pending[ac_queue]))
1296 netif_start_subqueue(dev, ac);
1297 }
1298 }
1299 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1300 }
1301
1302 return 0;
1303 err_del_interface:
1304 drv_remove_interface(local, sdata);
1305 err_stop:
1306 if (!local->open_count)
1307 drv_stop(local);
1308 err_del_bss:
1309 sdata->bss = NULL;
1310 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1311 mutex_lock(&local->mtx);
1312 list_del(&sdata->u.vlan.list);
1313 mutex_unlock(&local->mtx);
1314 }
1315 /* might already be clear but that doesn't matter */
1316 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1317 return res;
1318 }
1319
ieee80211_if_free(struct net_device * dev)1320 static void ieee80211_if_free(struct net_device *dev)
1321 {
1322 free_percpu(dev->tstats);
1323 }
1324
ieee80211_if_setup(struct net_device * dev)1325 static void ieee80211_if_setup(struct net_device *dev)
1326 {
1327 ether_setup(dev);
1328 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1329 dev->netdev_ops = &ieee80211_dataif_ops;
1330 dev->needs_free_netdev = true;
1331 dev->priv_destructor = ieee80211_if_free;
1332 }
1333
ieee80211_if_setup_no_queue(struct net_device * dev)1334 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1335 {
1336 ieee80211_if_setup(dev);
1337 dev->priv_flags |= IFF_NO_QUEUE;
1338 }
1339
ieee80211_iface_work(struct work_struct * work)1340 static void ieee80211_iface_work(struct work_struct *work)
1341 {
1342 struct ieee80211_sub_if_data *sdata =
1343 container_of(work, struct ieee80211_sub_if_data, work);
1344 struct ieee80211_local *local = sdata->local;
1345 struct sk_buff *skb;
1346 struct sta_info *sta;
1347
1348 if (!ieee80211_sdata_running(sdata))
1349 return;
1350
1351 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1352 return;
1353
1354 if (!ieee80211_can_run_worker(local))
1355 return;
1356
1357 /* first process frames */
1358 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1359 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1360
1361 if (ieee80211_is_action(mgmt->frame_control) &&
1362 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1363 int len = skb->len;
1364
1365 mutex_lock(&local->sta_mtx);
1366 sta = sta_info_get_bss(sdata, mgmt->sa);
1367 if (sta) {
1368 switch (mgmt->u.action.u.addba_req.action_code) {
1369 case WLAN_ACTION_ADDBA_REQ:
1370 ieee80211_process_addba_request(
1371 local, sta, mgmt, len);
1372 break;
1373 case WLAN_ACTION_ADDBA_RESP:
1374 ieee80211_process_addba_resp(local, sta,
1375 mgmt, len);
1376 break;
1377 case WLAN_ACTION_DELBA:
1378 ieee80211_process_delba(sdata, sta,
1379 mgmt, len);
1380 break;
1381 default:
1382 WARN_ON(1);
1383 break;
1384 }
1385 }
1386 mutex_unlock(&local->sta_mtx);
1387 } else if (ieee80211_is_action(mgmt->frame_control) &&
1388 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1389 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1390 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1391 struct ieee80211_rx_status *status;
1392 enum nl80211_band band;
1393 u8 opmode;
1394
1395 status = IEEE80211_SKB_RXCB(skb);
1396 band = status->band;
1397 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1398
1399 mutex_lock(&local->sta_mtx);
1400 sta = sta_info_get_bss(sdata, mgmt->sa);
1401
1402 if (sta)
1403 ieee80211_vht_handle_opmode(sdata, sta,
1404 opmode,
1405 band);
1406
1407 mutex_unlock(&local->sta_mtx);
1408 break;
1409 }
1410 case WLAN_VHT_ACTION_GROUPID_MGMT:
1411 ieee80211_process_mu_groups(sdata, mgmt);
1412 break;
1413 default:
1414 WARN_ON(1);
1415 break;
1416 }
1417 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1418 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1419 ieee80211_sta_rx_queued_ext(sdata, skb);
1420 else
1421 WARN_ON(1);
1422 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1423 struct ieee80211_hdr *hdr = (void *)mgmt;
1424 /*
1425 * So the frame isn't mgmt, but frame_control
1426 * is at the right place anyway, of course, so
1427 * the if statement is correct.
1428 *
1429 * Warn if we have other data frame types here,
1430 * they must not get here.
1431 */
1432 WARN_ON(hdr->frame_control &
1433 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1434 WARN_ON(!(hdr->seq_ctrl &
1435 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1436 /*
1437 * This was a fragment of a frame, received while
1438 * a block-ack session was active. That cannot be
1439 * right, so terminate the session.
1440 */
1441 mutex_lock(&local->sta_mtx);
1442 sta = sta_info_get_bss(sdata, mgmt->sa);
1443 if (sta) {
1444 u16 tid = ieee80211_get_tid(hdr);
1445
1446 __ieee80211_stop_rx_ba_session(
1447 sta, tid, WLAN_BACK_RECIPIENT,
1448 WLAN_REASON_QSTA_REQUIRE_SETUP,
1449 true);
1450 }
1451 mutex_unlock(&local->sta_mtx);
1452 } else switch (sdata->vif.type) {
1453 case NL80211_IFTYPE_STATION:
1454 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1455 break;
1456 case NL80211_IFTYPE_ADHOC:
1457 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1458 break;
1459 case NL80211_IFTYPE_MESH_POINT:
1460 if (!ieee80211_vif_is_mesh(&sdata->vif))
1461 break;
1462 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1463 break;
1464 default:
1465 WARN(1, "frame for unexpected interface type");
1466 break;
1467 }
1468
1469 kfree_skb(skb);
1470 }
1471
1472 /* then other type-dependent work */
1473 switch (sdata->vif.type) {
1474 case NL80211_IFTYPE_STATION:
1475 ieee80211_sta_work(sdata);
1476 break;
1477 case NL80211_IFTYPE_ADHOC:
1478 ieee80211_ibss_work(sdata);
1479 break;
1480 case NL80211_IFTYPE_MESH_POINT:
1481 if (!ieee80211_vif_is_mesh(&sdata->vif))
1482 break;
1483 ieee80211_mesh_work(sdata);
1484 break;
1485 case NL80211_IFTYPE_OCB:
1486 ieee80211_ocb_work(sdata);
1487 break;
1488 default:
1489 break;
1490 }
1491 }
1492
ieee80211_recalc_smps_work(struct work_struct * work)1493 static void ieee80211_recalc_smps_work(struct work_struct *work)
1494 {
1495 struct ieee80211_sub_if_data *sdata =
1496 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1497
1498 ieee80211_recalc_smps(sdata);
1499 }
1500
1501 /*
1502 * Helper function to initialise an interface to a specific type.
1503 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1504 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1505 enum nl80211_iftype type)
1506 {
1507 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1508 0xff, 0xff, 0xff};
1509
1510 /* clear type-dependent union */
1511 memset(&sdata->u, 0, sizeof(sdata->u));
1512
1513 /* and set some type-dependent values */
1514 sdata->vif.type = type;
1515 sdata->vif.p2p = false;
1516 sdata->wdev.iftype = type;
1517
1518 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1519 sdata->control_port_no_encrypt = false;
1520 sdata->control_port_over_nl80211 = false;
1521 sdata->control_port_no_preauth = false;
1522 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1523 sdata->vif.bss_conf.idle = true;
1524 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1525
1526 sdata->noack_map = 0;
1527
1528 /* only monitor/p2p-device differ */
1529 if (sdata->dev) {
1530 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1531 sdata->dev->type = ARPHRD_ETHER;
1532 }
1533
1534 skb_queue_head_init(&sdata->skb_queue);
1535 INIT_WORK(&sdata->work, ieee80211_iface_work);
1536 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1537 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1538 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1539 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1540
1541 switch (type) {
1542 case NL80211_IFTYPE_P2P_GO:
1543 type = NL80211_IFTYPE_AP;
1544 sdata->vif.type = type;
1545 sdata->vif.p2p = true;
1546 fallthrough;
1547 case NL80211_IFTYPE_AP:
1548 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1549 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1550 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1551 break;
1552 case NL80211_IFTYPE_P2P_CLIENT:
1553 type = NL80211_IFTYPE_STATION;
1554 sdata->vif.type = type;
1555 sdata->vif.p2p = true;
1556 fallthrough;
1557 case NL80211_IFTYPE_STATION:
1558 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1559 ieee80211_sta_setup_sdata(sdata);
1560 break;
1561 case NL80211_IFTYPE_OCB:
1562 sdata->vif.bss_conf.bssid = bssid_wildcard;
1563 ieee80211_ocb_setup_sdata(sdata);
1564 break;
1565 case NL80211_IFTYPE_ADHOC:
1566 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1567 ieee80211_ibss_setup_sdata(sdata);
1568 break;
1569 case NL80211_IFTYPE_MESH_POINT:
1570 if (ieee80211_vif_is_mesh(&sdata->vif))
1571 ieee80211_mesh_init_sdata(sdata);
1572 break;
1573 case NL80211_IFTYPE_MONITOR:
1574 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1575 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1576 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1577 MONITOR_FLAG_OTHER_BSS;
1578 break;
1579 case NL80211_IFTYPE_WDS:
1580 sdata->vif.bss_conf.bssid = NULL;
1581 break;
1582 case NL80211_IFTYPE_NAN:
1583 idr_init(&sdata->u.nan.function_inst_ids);
1584 spin_lock_init(&sdata->u.nan.func_lock);
1585 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1586 break;
1587 case NL80211_IFTYPE_AP_VLAN:
1588 case NL80211_IFTYPE_P2P_DEVICE:
1589 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1590 break;
1591 case NL80211_IFTYPE_UNSPECIFIED:
1592 case NUM_NL80211_IFTYPES:
1593 WARN_ON(1);
1594 break;
1595 }
1596
1597 ieee80211_debugfs_add_netdev(sdata);
1598 }
1599
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1600 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1601 enum nl80211_iftype type)
1602 {
1603 struct ieee80211_local *local = sdata->local;
1604 int ret, err;
1605 enum nl80211_iftype internal_type = type;
1606 bool p2p = false;
1607
1608 ASSERT_RTNL();
1609
1610 if (!local->ops->change_interface)
1611 return -EBUSY;
1612
1613 switch (sdata->vif.type) {
1614 case NL80211_IFTYPE_AP:
1615 case NL80211_IFTYPE_STATION:
1616 case NL80211_IFTYPE_ADHOC:
1617 case NL80211_IFTYPE_OCB:
1618 /*
1619 * Could maybe also all others here?
1620 * Just not sure how that interacts
1621 * with the RX/config path e.g. for
1622 * mesh.
1623 */
1624 break;
1625 default:
1626 return -EBUSY;
1627 }
1628
1629 switch (type) {
1630 case NL80211_IFTYPE_AP:
1631 case NL80211_IFTYPE_STATION:
1632 case NL80211_IFTYPE_ADHOC:
1633 case NL80211_IFTYPE_OCB:
1634 /*
1635 * Could probably support everything
1636 * but WDS here (WDS do_open can fail
1637 * under memory pressure, which this
1638 * code isn't prepared to handle).
1639 */
1640 break;
1641 case NL80211_IFTYPE_P2P_CLIENT:
1642 p2p = true;
1643 internal_type = NL80211_IFTYPE_STATION;
1644 break;
1645 case NL80211_IFTYPE_P2P_GO:
1646 p2p = true;
1647 internal_type = NL80211_IFTYPE_AP;
1648 break;
1649 default:
1650 return -EBUSY;
1651 }
1652
1653 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1654 if (ret)
1655 return ret;
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 return ret;
1680 }
1681
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1682 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1683 enum nl80211_iftype type)
1684 {
1685 int ret;
1686
1687 ASSERT_RTNL();
1688
1689 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1690 return 0;
1691
1692 if (ieee80211_sdata_running(sdata)) {
1693 ret = ieee80211_runtime_change_iftype(sdata, type);
1694 if (ret)
1695 return ret;
1696 } else {
1697 /* Purge and reset type-dependent state. */
1698 ieee80211_teardown_sdata(sdata);
1699 ieee80211_setup_sdata(sdata, type);
1700 }
1701
1702 /* reset some values that shouldn't be kept across type changes */
1703 if (type == NL80211_IFTYPE_STATION)
1704 sdata->u.mgd.use_4addr = false;
1705
1706 return 0;
1707 }
1708
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1709 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1710 u8 *perm_addr, enum nl80211_iftype type)
1711 {
1712 struct ieee80211_sub_if_data *sdata;
1713 u64 mask, start, addr, val, inc;
1714 u8 *m;
1715 u8 tmp_addr[ETH_ALEN];
1716 int i;
1717
1718 /* default ... something at least */
1719 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1720
1721 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1722 local->hw.wiphy->n_addresses <= 1)
1723 return;
1724
1725 mutex_lock(&local->iflist_mtx);
1726
1727 switch (type) {
1728 case NL80211_IFTYPE_MONITOR:
1729 /* doesn't matter */
1730 break;
1731 case NL80211_IFTYPE_WDS:
1732 case NL80211_IFTYPE_AP_VLAN:
1733 /* match up with an AP interface */
1734 list_for_each_entry(sdata, &local->interfaces, list) {
1735 if (sdata->vif.type != NL80211_IFTYPE_AP)
1736 continue;
1737 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1738 break;
1739 }
1740 /* keep default if no AP interface present */
1741 break;
1742 case NL80211_IFTYPE_P2P_CLIENT:
1743 case NL80211_IFTYPE_P2P_GO:
1744 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1745 list_for_each_entry(sdata, &local->interfaces, list) {
1746 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1747 continue;
1748 if (!ieee80211_sdata_running(sdata))
1749 continue;
1750 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1751 goto out_unlock;
1752 }
1753 }
1754 fallthrough;
1755 default:
1756 /* assign a new address if possible -- try n_addresses first */
1757 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1758 bool used = false;
1759
1760 list_for_each_entry(sdata, &local->interfaces, list) {
1761 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1762 sdata->vif.addr)) {
1763 used = true;
1764 break;
1765 }
1766 }
1767
1768 if (!used) {
1769 memcpy(perm_addr,
1770 local->hw.wiphy->addresses[i].addr,
1771 ETH_ALEN);
1772 break;
1773 }
1774 }
1775
1776 /* try mask if available */
1777 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1778 break;
1779
1780 m = local->hw.wiphy->addr_mask;
1781 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1782 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1783 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1784
1785 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1786 /* not a contiguous mask ... not handled now! */
1787 pr_info("not contiguous\n");
1788 break;
1789 }
1790
1791 /*
1792 * Pick address of existing interface in case user changed
1793 * MAC address manually, default to perm_addr.
1794 */
1795 m = local->hw.wiphy->perm_addr;
1796 list_for_each_entry(sdata, &local->interfaces, list) {
1797 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1798 continue;
1799 m = sdata->vif.addr;
1800 break;
1801 }
1802 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1803 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1804 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1805
1806 inc = 1ULL<<__ffs64(mask);
1807 val = (start & mask);
1808 addr = (start & ~mask) | (val & mask);
1809 do {
1810 bool used = false;
1811
1812 tmp_addr[5] = addr >> 0*8;
1813 tmp_addr[4] = addr >> 1*8;
1814 tmp_addr[3] = addr >> 2*8;
1815 tmp_addr[2] = addr >> 3*8;
1816 tmp_addr[1] = addr >> 4*8;
1817 tmp_addr[0] = addr >> 5*8;
1818
1819 val += inc;
1820
1821 list_for_each_entry(sdata, &local->interfaces, list) {
1822 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1823 used = true;
1824 break;
1825 }
1826 }
1827
1828 if (!used) {
1829 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1830 break;
1831 }
1832 addr = (start & ~mask) | (val & mask);
1833 } while (addr != start);
1834
1835 break;
1836 }
1837
1838 out_unlock:
1839 mutex_unlock(&local->iflist_mtx);
1840 }
1841
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)1842 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1843 unsigned char name_assign_type,
1844 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1845 struct vif_params *params)
1846 {
1847 struct net_device *ndev = NULL;
1848 struct ieee80211_sub_if_data *sdata = NULL;
1849 struct txq_info *txqi;
1850 void (*if_setup)(struct net_device *dev);
1851 int ret, i;
1852 int txqs = 1;
1853
1854 ASSERT_RTNL();
1855
1856 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1857 struct wireless_dev *wdev;
1858
1859 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1860 GFP_KERNEL);
1861 if (!sdata)
1862 return -ENOMEM;
1863 wdev = &sdata->wdev;
1864
1865 sdata->dev = NULL;
1866 strlcpy(sdata->name, name, IFNAMSIZ);
1867 ieee80211_assign_perm_addr(local, wdev->address, type);
1868 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1869 } else {
1870 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1871 sizeof(void *));
1872 int txq_size = 0;
1873
1874 if (local->ops->wake_tx_queue &&
1875 type != NL80211_IFTYPE_AP_VLAN &&
1876 (type != NL80211_IFTYPE_MONITOR ||
1877 (params->flags & MONITOR_FLAG_ACTIVE)))
1878 txq_size += sizeof(struct txq_info) +
1879 local->hw.txq_data_size;
1880
1881 if (local->ops->wake_tx_queue) {
1882 if_setup = ieee80211_if_setup_no_queue;
1883 } else {
1884 if_setup = ieee80211_if_setup;
1885 if (local->hw.queues >= IEEE80211_NUM_ACS)
1886 txqs = IEEE80211_NUM_ACS;
1887 }
1888
1889 ndev = alloc_netdev_mqs(size + txq_size,
1890 name, name_assign_type,
1891 if_setup, txqs, 1);
1892 if (!ndev)
1893 return -ENOMEM;
1894
1895 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1896 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1897
1898 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1899
1900 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1901 if (!ndev->tstats) {
1902 free_netdev(ndev);
1903 return -ENOMEM;
1904 }
1905
1906 ndev->needed_headroom = local->tx_headroom +
1907 4*6 /* four MAC addresses */
1908 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1909 + 6 /* mesh */
1910 + 8 /* rfc1042/bridge tunnel */
1911 - ETH_HLEN /* ethernet hard_header_len */
1912 + IEEE80211_ENCRYPT_HEADROOM;
1913 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1914
1915 ret = dev_alloc_name(ndev, ndev->name);
1916 if (ret < 0) {
1917 ieee80211_if_free(ndev);
1918 free_netdev(ndev);
1919 return ret;
1920 }
1921
1922 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1923 if (is_valid_ether_addr(params->macaddr))
1924 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1925 else
1926 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1927 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1928
1929 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1930 sdata = netdev_priv(ndev);
1931 ndev->ieee80211_ptr = &sdata->wdev;
1932 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1933 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1934
1935 if (txq_size) {
1936 txqi = netdev_priv(ndev) + size;
1937 ieee80211_txq_init(sdata, NULL, txqi, 0);
1938 }
1939
1940 sdata->dev = ndev;
1941 }
1942
1943 /* initialise type-independent data */
1944 sdata->wdev.wiphy = local->hw.wiphy;
1945 sdata->local = local;
1946
1947 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1948 skb_queue_head_init(&sdata->fragments[i].skb_list);
1949
1950 INIT_LIST_HEAD(&sdata->key_list);
1951
1952 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1953 ieee80211_dfs_cac_timer_work);
1954 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1955 ieee80211_delayed_tailroom_dec);
1956
1957 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1958 struct ieee80211_supported_band *sband;
1959 sband = local->hw.wiphy->bands[i];
1960 sdata->rc_rateidx_mask[i] =
1961 sband ? (1 << sband->n_bitrates) - 1 : 0;
1962 if (sband) {
1963 __le16 cap;
1964 u16 *vht_rate_mask;
1965
1966 memcpy(sdata->rc_rateidx_mcs_mask[i],
1967 sband->ht_cap.mcs.rx_mask,
1968 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1969
1970 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1971 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1972 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1973 } else {
1974 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1975 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1976 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1977 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1978 }
1979 }
1980
1981 ieee80211_set_default_queues(sdata);
1982
1983 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1984 sdata->user_power_level = local->user_power_level;
1985
1986 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1987
1988 /* setup type-dependent data */
1989 ieee80211_setup_sdata(sdata, type);
1990
1991 if (ndev) {
1992 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1993 if (type == NL80211_IFTYPE_STATION)
1994 sdata->u.mgd.use_4addr = params->use_4addr;
1995
1996 ndev->features |= local->hw.netdev_features;
1997 ndev->hw_features |= ndev->features &
1998 MAC80211_SUPPORTED_FEATURES_TX;
1999
2000 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2001
2002 /* MTU range: 256 - 2304 */
2003 ndev->min_mtu = 256;
2004 ndev->max_mtu = local->hw.max_mtu;
2005
2006 ret = register_netdevice(ndev);
2007 if (ret) {
2008 free_netdev(ndev);
2009 return ret;
2010 }
2011 }
2012
2013 mutex_lock(&local->iflist_mtx);
2014 list_add_tail_rcu(&sdata->list, &local->interfaces);
2015 mutex_unlock(&local->iflist_mtx);
2016
2017 if (new_wdev)
2018 *new_wdev = &sdata->wdev;
2019
2020 return 0;
2021 }
2022
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2023 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2024 {
2025 ASSERT_RTNL();
2026
2027 mutex_lock(&sdata->local->iflist_mtx);
2028 list_del_rcu(&sdata->list);
2029 mutex_unlock(&sdata->local->iflist_mtx);
2030
2031 if (sdata->vif.txq)
2032 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2033
2034 synchronize_rcu();
2035
2036 if (sdata->dev) {
2037 unregister_netdevice(sdata->dev);
2038 } else {
2039 cfg80211_unregister_wdev(&sdata->wdev);
2040 ieee80211_teardown_sdata(sdata);
2041 kfree(sdata);
2042 }
2043 }
2044
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2045 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2046 {
2047 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2048 return;
2049 ieee80211_do_stop(sdata, true);
2050 }
2051
ieee80211_remove_interfaces(struct ieee80211_local * local)2052 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2053 {
2054 struct ieee80211_sub_if_data *sdata, *tmp;
2055 LIST_HEAD(unreg_list);
2056 LIST_HEAD(wdev_list);
2057
2058 ASSERT_RTNL();
2059
2060 /* Before destroying the interfaces, make sure they're all stopped so
2061 * that the hardware is stopped. Otherwise, the driver might still be
2062 * iterating the interfaces during the shutdown, e.g. from a worker
2063 * or from RX processing or similar, and if it does so (using atomic
2064 * iteration) while we're manipulating the list, the iteration will
2065 * crash.
2066 *
2067 * After this, the hardware should be stopped and the driver should
2068 * have stopped all of its activities, so that we can do RCU-unaware
2069 * manipulations of the interface list below.
2070 */
2071 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2072
2073 WARN(local->open_count, "%s: open count remains %d\n",
2074 wiphy_name(local->hw.wiphy), local->open_count);
2075
2076 ieee80211_txq_teardown_flows(local);
2077
2078 mutex_lock(&local->iflist_mtx);
2079 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2080 list_del(&sdata->list);
2081
2082 if (sdata->dev)
2083 unregister_netdevice_queue(sdata->dev, &unreg_list);
2084 else
2085 list_add(&sdata->list, &wdev_list);
2086 }
2087 mutex_unlock(&local->iflist_mtx);
2088 unregister_netdevice_many(&unreg_list);
2089
2090 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2091 list_del(&sdata->list);
2092 cfg80211_unregister_wdev(&sdata->wdev);
2093 kfree(sdata);
2094 }
2095 }
2096
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2097 static int netdev_notify(struct notifier_block *nb,
2098 unsigned long state, void *ptr)
2099 {
2100 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2101 struct ieee80211_sub_if_data *sdata;
2102
2103 if (state != NETDEV_CHANGENAME)
2104 return NOTIFY_DONE;
2105
2106 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2107 return NOTIFY_DONE;
2108
2109 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2110 return NOTIFY_DONE;
2111
2112 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2113 memcpy(sdata->name, dev->name, IFNAMSIZ);
2114 ieee80211_debugfs_rename_netdev(sdata);
2115
2116 return NOTIFY_OK;
2117 }
2118
2119 static struct notifier_block mac80211_netdev_notifier = {
2120 .notifier_call = netdev_notify,
2121 };
2122
ieee80211_iface_init(void)2123 int ieee80211_iface_init(void)
2124 {
2125 return register_netdevice_notifier(&mac80211_netdev_notifier);
2126 }
2127
ieee80211_iface_exit(void)2128 void ieee80211_iface_exit(void)
2129 {
2130 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2131 }
2132
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2133 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2134 {
2135 if (sdata->vif.type == NL80211_IFTYPE_AP)
2136 atomic_inc(&sdata->u.ap.num_mcast_sta);
2137 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2138 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2139 }
2140
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2141 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2142 {
2143 if (sdata->vif.type == NL80211_IFTYPE_AP)
2144 atomic_dec(&sdata->u.ap.num_mcast_sta);
2145 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2146 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2147 }
2148
