1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Interface handling
4 *
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright (c) 2016 Intel Deutschland GmbH
11 * Copyright (C) 2018-2021 Intel Corporation
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 static void ieee80211_iface_work(struct work_struct *work);
46
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
48 {
49 struct ieee80211_chanctx_conf *chanctx_conf;
50 int power;
51
52 rcu_read_lock();
53 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
54 if (!chanctx_conf) {
55 rcu_read_unlock();
56 return false;
57 }
58
59 power = ieee80211_chandef_max_power(&chanctx_conf->def);
60 rcu_read_unlock();
61
62 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
63 power = min(power, sdata->user_power_level);
64
65 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
66 power = min(power, sdata->ap_power_level);
67
68 if (power != sdata->vif.bss_conf.txpower) {
69 sdata->vif.bss_conf.txpower = power;
70 ieee80211_hw_config(sdata->local, 0);
71 return true;
72 }
73
74 return false;
75 }
76
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
78 bool update_bss)
79 {
80 if (__ieee80211_recalc_txpower(sdata) ||
81 (update_bss && ieee80211_sdata_running(sdata)))
82 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
83 }
84
__ieee80211_idle_off(struct ieee80211_local * local)85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
86 {
87 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
88 return 0;
89
90 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
91 return IEEE80211_CONF_CHANGE_IDLE;
92 }
93
__ieee80211_idle_on(struct ieee80211_local * local)94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
95 {
96 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
97 return 0;
98
99 ieee80211_flush_queues(local, NULL, false);
100
101 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
102 return IEEE80211_CONF_CHANGE_IDLE;
103 }
104
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
106 bool force_active)
107 {
108 bool working, scanning, active;
109 unsigned int led_trig_start = 0, led_trig_stop = 0;
110
111 lockdep_assert_held(&local->mtx);
112
113 active = force_active ||
114 !list_empty(&local->chanctx_list) ||
115 local->monitors;
116
117 working = !local->ops->remain_on_channel &&
118 !list_empty(&local->roc_list);
119
120 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
121 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
122
123 if (working || scanning)
124 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125 else
126 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127
128 if (active)
129 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130 else
131 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132
133 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
134
135 if (working || scanning || active)
136 return __ieee80211_idle_off(local);
137 return __ieee80211_idle_on(local);
138 }
139
ieee80211_idle_off(struct ieee80211_local * local)140 u32 ieee80211_idle_off(struct ieee80211_local *local)
141 {
142 return __ieee80211_recalc_idle(local, true);
143 }
144
ieee80211_recalc_idle(struct ieee80211_local * local)145 void ieee80211_recalc_idle(struct ieee80211_local *local)
146 {
147 u32 change = __ieee80211_recalc_idle(local, false);
148 if (change)
149 ieee80211_hw_config(local, change);
150 }
151
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
153 bool check_dup)
154 {
155 struct ieee80211_local *local = sdata->local;
156 struct ieee80211_sub_if_data *iter;
157 u64 new, mask, tmp;
158 u8 *m;
159 int ret = 0;
160
161 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
162 return 0;
163
164 m = addr;
165 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
166 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
167 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
168
169 m = local->hw.wiphy->addr_mask;
170 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
171 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
172 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
173
174 if (!check_dup)
175 return ret;
176
177 mutex_lock(&local->iflist_mtx);
178 list_for_each_entry(iter, &local->interfaces, list) {
179 if (iter == sdata)
180 continue;
181
182 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
183 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
184 continue;
185
186 m = iter->vif.addr;
187 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
188 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
189 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
190
191 if ((new & ~mask) != (tmp & ~mask)) {
192 ret = -EINVAL;
193 break;
194 }
195 }
196 mutex_unlock(&local->iflist_mtx);
197
198 return ret;
199 }
200
ieee80211_change_mac(struct net_device * dev,void * addr)201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
202 {
203 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
204 struct sockaddr *sa = addr;
205 bool check_dup = true;
206 int ret;
207
208 if (ieee80211_sdata_running(sdata))
209 return -EBUSY;
210
211 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
212 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
213 check_dup = false;
214
215 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
216 if (ret)
217 return ret;
218
219 ret = eth_mac_addr(dev, sa);
220
221 if (ret == 0)
222 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
223
224 return ret;
225 }
226
identical_mac_addr_allowed(int type1,int type2)227 static inline int identical_mac_addr_allowed(int type1, int type2)
228 {
229 return type1 == NL80211_IFTYPE_MONITOR ||
230 type2 == NL80211_IFTYPE_MONITOR ||
231 type1 == NL80211_IFTYPE_P2P_DEVICE ||
232 type2 == NL80211_IFTYPE_P2P_DEVICE ||
233 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
234 (type1 == NL80211_IFTYPE_WDS &&
235 (type2 == NL80211_IFTYPE_WDS ||
236 type2 == NL80211_IFTYPE_AP)) ||
237 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
238 (type1 == NL80211_IFTYPE_AP_VLAN &&
239 (type2 == NL80211_IFTYPE_AP ||
240 type2 == NL80211_IFTYPE_AP_VLAN));
241 }
242
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
244 enum nl80211_iftype iftype)
245 {
246 struct ieee80211_local *local = sdata->local;
247 struct ieee80211_sub_if_data *nsdata;
248 int ret;
249
250 ASSERT_RTNL();
251
252 /* we hold the RTNL here so can safely walk the list */
253 list_for_each_entry(nsdata, &local->interfaces, list) {
254 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
255 /*
256 * Only OCB and monitor mode may coexist
257 */
258 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
259 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
260 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
261 nsdata->vif.type == NL80211_IFTYPE_OCB))
262 return -EBUSY;
263
264 /*
265 * Allow only a single IBSS interface to be up at any
266 * time. This is restricted because beacon distribution
267 * cannot work properly if both are in the same IBSS.
268 *
269 * To remove this restriction we'd have to disallow them
270 * from setting the same SSID on different IBSS interfaces
271 * belonging to the same hardware. Then, however, we're
272 * faced with having to adopt two different TSF timers...
273 */
274 if (iftype == NL80211_IFTYPE_ADHOC &&
275 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276 return -EBUSY;
277 /*
278 * will not add another interface while any channel
279 * switch is active.
280 */
281 if (nsdata->vif.csa_active)
282 return -EBUSY;
283
284 /*
285 * The remaining checks are only performed for interfaces
286 * with the same MAC address.
287 */
288 if (!ether_addr_equal(sdata->vif.addr,
289 nsdata->vif.addr))
290 continue;
291
292 /*
293 * check whether it may have the same address
294 */
295 if (!identical_mac_addr_allowed(iftype,
296 nsdata->vif.type))
297 return -ENOTUNIQ;
298
299 /*
300 * can only add VLANs to enabled APs
301 */
302 if (iftype == NL80211_IFTYPE_AP_VLAN &&
303 nsdata->vif.type == NL80211_IFTYPE_AP)
304 sdata->bss = &nsdata->u.ap;
305 }
306 }
307
308 mutex_lock(&local->chanctx_mtx);
309 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
310 mutex_unlock(&local->chanctx_mtx);
311 return ret;
312 }
313
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
315 enum nl80211_iftype iftype)
316 {
317 int n_queues = sdata->local->hw.queues;
318 int i;
319
320 if (iftype == NL80211_IFTYPE_NAN)
321 return 0;
322
323 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
324 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
325 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
326 IEEE80211_INVAL_HW_QUEUE))
327 return -EINVAL;
328 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
329 n_queues))
330 return -EINVAL;
331 }
332 }
333
334 if ((iftype != NL80211_IFTYPE_AP &&
335 iftype != NL80211_IFTYPE_P2P_GO &&
336 iftype != NL80211_IFTYPE_MESH_POINT) ||
337 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
338 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
339 return 0;
340 }
341
342 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
343 return -EINVAL;
344
345 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
346 return -EINVAL;
347
348 return 0;
349 }
350
ieee80211_open(struct net_device * dev)351 static int ieee80211_open(struct net_device *dev)
352 {
353 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
354 int err;
355
356 /* fail early if user set an invalid address */
357 if (!is_valid_ether_addr(dev->dev_addr))
358 return -EADDRNOTAVAIL;
359
360 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
361 if (err)
362 return err;
363
364 return ieee80211_do_open(&sdata->wdev, true);
365 }
366
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)367 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
368 bool going_down)
369 {
370 struct ieee80211_local *local = sdata->local;
371 unsigned long flags;
372 struct sk_buff_head freeq;
373 struct sk_buff *skb, *tmp;
374 u32 hw_reconf_flags = 0;
375 int i, flushed;
376 struct ps_data *ps;
377 struct cfg80211_chan_def chandef;
378 bool cancel_scan;
379 struct cfg80211_nan_func *func;
380
381 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
382
383 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
384 if (cancel_scan)
385 ieee80211_scan_cancel(local);
386
387 /*
388 * Stop TX on this interface first.
389 */
390 if (sdata->dev)
391 netif_tx_stop_all_queues(sdata->dev);
392
393 ieee80211_roc_purge(local, sdata);
394
395 switch (sdata->vif.type) {
396 case NL80211_IFTYPE_STATION:
397 ieee80211_mgd_stop(sdata);
398 break;
399 case NL80211_IFTYPE_ADHOC:
400 ieee80211_ibss_stop(sdata);
401 break;
402 case NL80211_IFTYPE_MONITOR:
403 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
404 break;
405 list_del_rcu(&sdata->u.mntr.list);
406 break;
407 default:
408 break;
409 }
410
411 /*
412 * Remove all stations associated with this interface.
413 *
414 * This must be done before calling ops->remove_interface()
415 * because otherwise we can later invoke ops->sta_notify()
416 * whenever the STAs are removed, and that invalidates driver
417 * assumptions about always getting a vif pointer that is valid
418 * (because if we remove a STA after ops->remove_interface()
419 * the driver will have removed the vif info already!)
420 *
421 * In WDS mode a station must exist here and be flushed, for
422 * AP_VLANs stations may exist since there's nothing else that
423 * would have removed them, but in other modes there shouldn't
424 * be any stations.
425 */
426 flushed = sta_info_flush(sdata);
427 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
428 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
429 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
430
431 /* don't count this interface for allmulti while it is down */
432 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
433 atomic_dec(&local->iff_allmultis);
434
435 if (sdata->vif.type == NL80211_IFTYPE_AP) {
436 local->fif_pspoll--;
437 local->fif_probe_req--;
438 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
439 local->fif_probe_req--;
440 }
441
442 if (sdata->dev) {
443 netif_addr_lock_bh(sdata->dev);
444 spin_lock_bh(&local->filter_lock);
445 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
446 sdata->dev->addr_len);
447 spin_unlock_bh(&local->filter_lock);
448 netif_addr_unlock_bh(sdata->dev);
449 }
450
451 del_timer_sync(&local->dynamic_ps_timer);
452 cancel_work_sync(&local->dynamic_ps_enable_work);
453
454 cancel_work_sync(&sdata->recalc_smps);
455 sdata_lock(sdata);
456 mutex_lock(&local->mtx);
457 sdata->vif.csa_active = false;
458 if (sdata->vif.type == NL80211_IFTYPE_STATION)
459 sdata->u.mgd.csa_waiting_bcn = false;
460 if (sdata->csa_block_tx) {
461 ieee80211_wake_vif_queues(local, sdata,
462 IEEE80211_QUEUE_STOP_REASON_CSA);
463 sdata->csa_block_tx = false;
464 }
465 mutex_unlock(&local->mtx);
466 sdata_unlock(sdata);
467
468 cancel_work_sync(&sdata->csa_finalize_work);
469
470 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
471
472 if (sdata->wdev.cac_started) {
473 chandef = sdata->vif.bss_conf.chandef;
474 WARN_ON(local->suspended);
475 mutex_lock(&local->mtx);
476 ieee80211_vif_release_channel(sdata);
477 mutex_unlock(&local->mtx);
478 cfg80211_cac_event(sdata->dev, &chandef,
479 NL80211_RADAR_CAC_ABORTED,
480 GFP_KERNEL);
481 }
482
483 /* APs need special treatment */
484 if (sdata->vif.type == NL80211_IFTYPE_AP) {
485 struct ieee80211_sub_if_data *vlan, *tmpsdata;
486
487 /* down all dependent devices, that is VLANs */
488 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
489 u.vlan.list)
490 dev_close(vlan->dev);
491 WARN_ON(!list_empty(&sdata->u.ap.vlans));
492 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
493 /* remove all packets in parent bc_buf pointing to this dev */
494 ps = &sdata->bss->ps;
495
496 spin_lock_irqsave(&ps->bc_buf.lock, flags);
497 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
498 if (skb->dev == sdata->dev) {
499 __skb_unlink(skb, &ps->bc_buf);
500 local->total_ps_buffered--;
501 ieee80211_free_txskb(&local->hw, skb);
502 }
503 }
504 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
505 }
506
507 if (going_down)
508 local->open_count--;
509
510 switch (sdata->vif.type) {
511 case NL80211_IFTYPE_AP_VLAN:
512 mutex_lock(&local->mtx);
513 list_del(&sdata->u.vlan.list);
514 mutex_unlock(&local->mtx);
515 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
516 /* see comment in the default case below */
517 ieee80211_free_keys(sdata, true);
518 /* no need to tell driver */
519 break;
520 case NL80211_IFTYPE_MONITOR:
521 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
522 local->cooked_mntrs--;
523 break;
524 }
525
526 local->monitors--;
527 if (local->monitors == 0) {
528 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
529 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
530 }
531
532 ieee80211_adjust_monitor_flags(sdata, -1);
533 break;
534 case NL80211_IFTYPE_NAN:
535 /* clean all the functions */
536 spin_lock_bh(&sdata->u.nan.func_lock);
537
538 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
539 idr_remove(&sdata->u.nan.function_inst_ids, i);
540 cfg80211_free_nan_func(func);
541 }
542 idr_destroy(&sdata->u.nan.function_inst_ids);
543
544 spin_unlock_bh(&sdata->u.nan.func_lock);
545 break;
546 case NL80211_IFTYPE_P2P_DEVICE:
547 /* relies on synchronize_rcu() below */
548 RCU_INIT_POINTER(local->p2p_sdata, NULL);
549 fallthrough;
550 default:
551 cancel_work_sync(&sdata->work);
552 /*
553 * When we get here, the interface is marked down.
554 * Free the remaining keys, if there are any
555 * (which can happen in AP mode if userspace sets
556 * keys before the interface is operating, and maybe
557 * also in WDS mode)
558 *
559 * Force the key freeing to always synchronize_net()
560 * to wait for the RX path in case it is using this
561 * interface enqueuing frames at this very time on
562 * another CPU.
563 */
564 ieee80211_free_keys(sdata, true);
565 skb_queue_purge(&sdata->skb_queue);
566 }
567
568 /*
569 * Since ieee80211_free_txskb() may issue __dev_queue_xmit()
570 * which should be called with interrupts enabled, reclamation
571 * is done in two phases:
572 */
573 __skb_queue_head_init(&freeq);
574
575 /* unlink from local queues... */
576 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
577 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
578 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
579 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
580 if (info->control.vif == &sdata->vif) {
581 __skb_unlink(skb, &local->pending[i]);
582 __skb_queue_tail(&freeq, skb);
583 }
584 }
585 }
586 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
587
588 /* ... and perform actual reclamation with interrupts enabled. */
589 skb_queue_walk_safe(&freeq, skb, tmp) {
590 __skb_unlink(skb, &freeq);
591 ieee80211_free_txskb(&local->hw, skb);
592 }
593
594 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
595 ieee80211_txq_remove_vlan(local, sdata);
596
597 sdata->bss = NULL;
598
599 if (local->open_count == 0)
600 ieee80211_clear_tx_pending(local);
601
602 sdata->vif.bss_conf.beacon_int = 0;
603
604 /*
605 * If the interface goes down while suspended, presumably because
606 * the device was unplugged and that happens before our resume,
607 * then the driver is already unconfigured and the remainder of
608 * this function isn't needed.
609 * XXX: what about WoWLAN? If the device has software state, e.g.
610 * memory allocated, it might expect teardown commands from
611 * mac80211 here?
612 */
613 if (local->suspended) {
614 WARN_ON(local->wowlan);
615 WARN_ON(rtnl_dereference(local->monitor_sdata));
616 return;
617 }
618
619 switch (sdata->vif.type) {
620 case NL80211_IFTYPE_AP_VLAN:
621 break;
622 case NL80211_IFTYPE_MONITOR:
623 if (local->monitors == 0)
624 ieee80211_del_virtual_monitor(local);
625
626 mutex_lock(&local->mtx);
627 ieee80211_recalc_idle(local);
628 mutex_unlock(&local->mtx);
629
630 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
631 break;
632
633 fallthrough;
634 default:
635 if (going_down)
636 drv_remove_interface(local, sdata);
637 }
638
639 ieee80211_recalc_ps(local);
640
641 if (cancel_scan)
642 flush_delayed_work(&local->scan_work);
643
644 if (local->open_count == 0) {
645 ieee80211_stop_device(local);
646
647 /* no reconfiguring after stop! */
648 return;
649 }
650
651 /* do after stop to avoid reconfiguring when we stop anyway */
652 ieee80211_configure_filter(local);
653 ieee80211_hw_config(local, hw_reconf_flags);
654
655 if (local->monitors == local->open_count)
656 ieee80211_add_virtual_monitor(local);
657 }
658
ieee80211_stop(struct net_device * dev)659 static int ieee80211_stop(struct net_device *dev)
660 {
661 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
662
663 ieee80211_do_stop(sdata, true);
664
665 return 0;
666 }
667
ieee80211_set_multicast_list(struct net_device * dev)668 static void ieee80211_set_multicast_list(struct net_device *dev)
669 {
670 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
671 struct ieee80211_local *local = sdata->local;
672 int allmulti, sdata_allmulti;
673
674 allmulti = !!(dev->flags & IFF_ALLMULTI);
675 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
676
677 if (allmulti != sdata_allmulti) {
678 if (dev->flags & IFF_ALLMULTI)
679 atomic_inc(&local->iff_allmultis);
680 else
681 atomic_dec(&local->iff_allmultis);
682 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
683 }
684
685 spin_lock_bh(&local->filter_lock);
686 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
687 spin_unlock_bh(&local->filter_lock);
688 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
689 }
690
691 /*
692 * Called when the netdev is removed or, by the code below, before
693 * the interface type changes.
694 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)695 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
696 {
697 /* free extra data */
698 ieee80211_free_keys(sdata, false);
699
700 ieee80211_debugfs_remove_netdev(sdata);
701
702 ieee80211_destroy_frag_cache(&sdata->frags);
703
704 if (ieee80211_vif_is_mesh(&sdata->vif))
705 ieee80211_mesh_teardown_sdata(sdata);
706 }
707
ieee80211_uninit(struct net_device * dev)708 static void ieee80211_uninit(struct net_device *dev)
709 {
710 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
711 }
712
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)713 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
714 struct sk_buff *skb,
715 struct net_device *sb_dev)
716 {
717 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
718 }
719
720 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)721 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
722 {
723 dev_fetch_sw_netstats(stats, dev->tstats);
724 }
725
726 static const struct net_device_ops ieee80211_dataif_ops = {
727 .ndo_open = ieee80211_open,
728 .ndo_stop = ieee80211_stop,
729 .ndo_uninit = ieee80211_uninit,
730 .ndo_start_xmit = ieee80211_subif_start_xmit,
731 .ndo_set_rx_mode = ieee80211_set_multicast_list,
732 .ndo_set_mac_address = ieee80211_change_mac,
733 .ndo_select_queue = ieee80211_netdev_select_queue,
734 .ndo_get_stats64 = ieee80211_get_stats64,
735 };
736
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)737 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
738 struct sk_buff *skb,
739 struct net_device *sb_dev)
740 {
741 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
742 struct ieee80211_local *local = sdata->local;
743 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
744 struct ieee80211_hdr *hdr;
745 int len_rthdr;
746
747 if (local->hw.queues < IEEE80211_NUM_ACS)
748 return 0;
749
750 /* reset flags and info before parsing radiotap header */
751 memset(info, 0, sizeof(*info));
752
753 if (!ieee80211_parse_tx_radiotap(skb, dev))
754 return 0; /* doesn't matter, frame will be dropped */
755
756 len_rthdr = ieee80211_get_radiotap_len(skb->data);
757 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
758 if (skb->len < len_rthdr + 2 ||
759 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
760 return 0; /* doesn't matter, frame will be dropped */
761
762 return ieee80211_select_queue_80211(sdata, skb, hdr);
763 }
764
765 static const struct net_device_ops ieee80211_monitorif_ops = {
766 .ndo_open = ieee80211_open,
767 .ndo_stop = ieee80211_stop,
768 .ndo_uninit = ieee80211_uninit,
769 .ndo_start_xmit = ieee80211_monitor_start_xmit,
770 .ndo_set_rx_mode = ieee80211_set_multicast_list,
771 .ndo_set_mac_address = ieee80211_change_mac,
772 .ndo_select_queue = ieee80211_monitor_select_queue,
773 .ndo_get_stats64 = ieee80211_get_stats64,
774 };
775
776 static const struct net_device_ops ieee80211_dataif_8023_ops = {
777 .ndo_open = ieee80211_open,
778 .ndo_stop = ieee80211_stop,
779 .ndo_uninit = ieee80211_uninit,
780 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
781 .ndo_set_rx_mode = ieee80211_set_multicast_list,
782 .ndo_set_mac_address = ieee80211_change_mac,
783 .ndo_select_queue = ieee80211_netdev_select_queue,
784 .ndo_get_stats64 = ieee80211_get_stats64,
785 };
786
ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)787 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
788 {
789 switch (iftype) {
790 /* P2P GO and client are mapped to AP/STATION types */
791 case NL80211_IFTYPE_AP:
792 case NL80211_IFTYPE_STATION:
793 return true;
794 default:
795 return false;
796 }
797 }
798
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)799 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
800 {
801 struct ieee80211_local *local = sdata->local;
802 u32 flags;
803
804 flags = sdata->vif.offload_flags;
805
806 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
807 ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
808 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
809
810 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
811 local->hw.wiphy->frag_threshold != (u32)-1)
812 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
813
814 if (local->monitors)
815 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
816 } else {
817 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
818 }
819
820 if (sdata->vif.offload_flags == flags)
821 return false;
822
823 sdata->vif.offload_flags = flags;
824 return true;
825 }
826
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)827 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
828 {
829 struct ieee80211_local *local = sdata->local;
830 struct ieee80211_sub_if_data *bss = sdata;
831 bool enabled;
832
833 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
834 if (!sdata->bss)
835 return;
836
837 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
838 }
839
840 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
841 !ieee80211_iftype_supports_encap_offload(bss->vif.type))
842 return;
843
844 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
845 if (sdata->wdev.use_4addr &&
846 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
847 enabled = false;
848
849 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
850 &ieee80211_dataif_ops;
851 }
852
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)853 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
854 {
855 struct ieee80211_local *local = sdata->local;
856 struct ieee80211_sub_if_data *vsdata;
857
858 if (ieee80211_set_sdata_offload_flags(sdata)) {
859 drv_update_vif_offload(local, sdata);
860 ieee80211_set_vif_encap_ops(sdata);
861 }
862
863 list_for_each_entry(vsdata, &local->interfaces, list) {
864 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
865 vsdata->bss != &sdata->u.ap)
866 continue;
867
868 ieee80211_set_vif_encap_ops(vsdata);
869 }
870 }
871
ieee80211_recalc_offload(struct ieee80211_local * local)872 void ieee80211_recalc_offload(struct ieee80211_local *local)
873 {
874 struct ieee80211_sub_if_data *sdata;
875
876 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
877 return;
878
879 mutex_lock(&local->iflist_mtx);
880
881 list_for_each_entry(sdata, &local->interfaces, list) {
882 if (!ieee80211_sdata_running(sdata))
883 continue;
884
885 ieee80211_recalc_sdata_offload(sdata);
886 }
887
888 mutex_unlock(&local->iflist_mtx);
889 }
890
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)891 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
892 const int offset)
893 {
894 struct ieee80211_local *local = sdata->local;
895 u32 flags = sdata->u.mntr.flags;
896
897 #define ADJUST(_f, _s) do { \
898 if (flags & MONITOR_FLAG_##_f) \
899 local->fif_##_s += offset; \
900 } while (0)
901
902 ADJUST(FCSFAIL, fcsfail);
903 ADJUST(PLCPFAIL, plcpfail);
904 ADJUST(CONTROL, control);
905 ADJUST(CONTROL, pspoll);
906 ADJUST(OTHER_BSS, other_bss);
907
908 #undef ADJUST
909 }
910
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)911 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
912 {
913 struct ieee80211_local *local = sdata->local;
914 int i;
915
916 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
917 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
918 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
919 else if (local->hw.queues >= IEEE80211_NUM_ACS)
920 sdata->vif.hw_queue[i] = i;
921 else
922 sdata->vif.hw_queue[i] = 0;
923 }
924 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
925 }
926
ieee80211_add_virtual_monitor(struct ieee80211_local * local)927 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
928 {
929 struct ieee80211_sub_if_data *sdata;
930 int ret;
931
932 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
933 return 0;
934
935 ASSERT_RTNL();
936
937 if (local->monitor_sdata)
938 return 0;
939
940 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
941 if (!sdata)
942 return -ENOMEM;
943
944 /* set up data */
945 sdata->local = local;
946 sdata->vif.type = NL80211_IFTYPE_MONITOR;
947 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
948 wiphy_name(local->hw.wiphy));
949 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
950
951 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
952
953 ieee80211_set_default_queues(sdata);
954
955 ret = drv_add_interface(local, sdata);
956 if (WARN_ON(ret)) {
957 /* ok .. stupid driver, it asked for this! */
958 kfree(sdata);
959 return ret;
960 }
961
962 set_bit(SDATA_STATE_RUNNING, &sdata->state);
963
964 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
965 if (ret) {
966 kfree(sdata);
967 return ret;
968 }
969
970 mutex_lock(&local->iflist_mtx);
971 rcu_assign_pointer(local->monitor_sdata, sdata);
972 mutex_unlock(&local->iflist_mtx);
973
974 mutex_lock(&local->mtx);
975 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
976 IEEE80211_CHANCTX_EXCLUSIVE);
977 mutex_unlock(&local->mtx);
978 if (ret) {
979 mutex_lock(&local->iflist_mtx);
980 RCU_INIT_POINTER(local->monitor_sdata, NULL);
981 mutex_unlock(&local->iflist_mtx);
982 synchronize_net();
983 drv_remove_interface(local, sdata);
984 kfree(sdata);
985 return ret;
986 }
987
988 skb_queue_head_init(&sdata->skb_queue);
989 INIT_WORK(&sdata->work, ieee80211_iface_work);
990
991 return 0;
992 }
993
ieee80211_del_virtual_monitor(struct ieee80211_local * local)994 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
995 {
996 struct ieee80211_sub_if_data *sdata;
997
998 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
999 return;
1000
1001 ASSERT_RTNL();
1002
1003 mutex_lock(&local->iflist_mtx);
1004
1005 sdata = rcu_dereference_protected(local->monitor_sdata,
1006 lockdep_is_held(&local->iflist_mtx));
1007 if (!sdata) {
1008 mutex_unlock(&local->iflist_mtx);
1009 return;
1010 }
1011
1012 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1013 mutex_unlock(&local->iflist_mtx);
1014
1015 synchronize_net();
1016
1017 mutex_lock(&local->mtx);
1018 ieee80211_vif_release_channel(sdata);
1019 mutex_unlock(&local->mtx);
1020
1021 drv_remove_interface(local, sdata);
1022
1023 kfree(sdata);
1024 }
1025
1026 /*
1027 * NOTE: Be very careful when changing this function, it must NOT return
1028 * an error on interface type changes that have been pre-checked, so most
1029 * checks should be in ieee80211_check_concurrent_iface.
1030 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1031 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1032 {
1033 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1034 struct net_device *dev = wdev->netdev;
1035 struct ieee80211_local *local = sdata->local;
1036 struct sta_info *sta;
1037 u32 changed = 0;
1038 int res;
1039 u32 hw_reconf_flags = 0;
1040
1041 switch (sdata->vif.type) {
1042 case NL80211_IFTYPE_WDS:
1043 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
1044 return -ENOLINK;
1045 break;
1046 case NL80211_IFTYPE_AP_VLAN: {
1047 struct ieee80211_sub_if_data *master;
1048
1049 if (!sdata->bss)
1050 return -ENOLINK;
1051
1052 mutex_lock(&local->mtx);
1053 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1054 mutex_unlock(&local->mtx);
1055
1056 master = container_of(sdata->bss,
1057 struct ieee80211_sub_if_data, u.ap);
1058 sdata->control_port_protocol =
1059 master->control_port_protocol;
1060 sdata->control_port_no_encrypt =
1061 master->control_port_no_encrypt;
1062 sdata->control_port_over_nl80211 =
1063 master->control_port_over_nl80211;
1064 sdata->control_port_no_preauth =
1065 master->control_port_no_preauth;
1066 sdata->vif.cab_queue = master->vif.cab_queue;
1067 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1068 sizeof(sdata->vif.hw_queue));
1069 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1070
1071 mutex_lock(&local->key_mtx);
1072 sdata->crypto_tx_tailroom_needed_cnt +=
1073 master->crypto_tx_tailroom_needed_cnt;
1074 mutex_unlock(&local->key_mtx);
1075
1076 break;
1077 }
1078 case NL80211_IFTYPE_AP:
1079 sdata->bss = &sdata->u.ap;
1080 break;
1081 case NL80211_IFTYPE_MESH_POINT:
1082 case NL80211_IFTYPE_STATION:
1083 case NL80211_IFTYPE_MONITOR:
1084 case NL80211_IFTYPE_ADHOC:
1085 case NL80211_IFTYPE_P2P_DEVICE:
1086 case NL80211_IFTYPE_OCB:
1087 case NL80211_IFTYPE_NAN:
1088 /* no special treatment */
1089 break;
1090 case NL80211_IFTYPE_UNSPECIFIED:
1091 case NUM_NL80211_IFTYPES:
1092 case NL80211_IFTYPE_P2P_CLIENT:
1093 case NL80211_IFTYPE_P2P_GO:
1094 /* cannot happen */
1095 WARN_ON(1);
1096 break;
1097 }
1098
1099 if (local->open_count == 0) {
1100 res = drv_start(local);
1101 if (res)
1102 goto err_del_bss;
1103 /* we're brought up, everything changes */
1104 hw_reconf_flags = ~0;
1105 ieee80211_led_radio(local, true);
1106 ieee80211_mod_tpt_led_trig(local,
1107 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1108 }
1109
1110 /*
1111 * Copy the hopefully now-present MAC address to
1112 * this interface, if it has the special null one.
1113 */
1114 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1115 memcpy(dev->dev_addr,
1116 local->hw.wiphy->perm_addr,
1117 ETH_ALEN);
1118 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1119
1120 if (!is_valid_ether_addr(dev->dev_addr)) {
1121 res = -EADDRNOTAVAIL;
1122 goto err_stop;
1123 }
1124 }
1125
1126 switch (sdata->vif.type) {
1127 case NL80211_IFTYPE_AP_VLAN:
1128 /* no need to tell driver, but set carrier and chanctx */
1129 if (rtnl_dereference(sdata->bss->beacon)) {
1130 ieee80211_vif_vlan_copy_chanctx(sdata);
1131 netif_carrier_on(dev);
1132 ieee80211_set_vif_encap_ops(sdata);
1133 } else {
1134 netif_carrier_off(dev);
1135 }
1136 break;
1137 case NL80211_IFTYPE_MONITOR:
1138 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1139 local->cooked_mntrs++;
1140 break;
1141 }
1142
1143 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1144 res = drv_add_interface(local, sdata);
1145 if (res)
1146 goto err_stop;
1147 } else if (local->monitors == 0 && local->open_count == 0) {
1148 res = ieee80211_add_virtual_monitor(local);
1149 if (res)
1150 goto err_stop;
1151 }
1152
1153 /* must be before the call to ieee80211_configure_filter */
1154 local->monitors++;
1155 if (local->monitors == 1) {
1156 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1157 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1158 }
1159
1160 ieee80211_adjust_monitor_flags(sdata, 1);
1161 ieee80211_configure_filter(local);
1162 ieee80211_recalc_offload(local);
1163 mutex_lock(&local->mtx);
1164 ieee80211_recalc_idle(local);
1165 mutex_unlock(&local->mtx);
1166
1167 netif_carrier_on(dev);
1168 break;
1169 default:
1170 if (coming_up) {
1171 ieee80211_del_virtual_monitor(local);
1172 ieee80211_set_sdata_offload_flags(sdata);
1173
1174 res = drv_add_interface(local, sdata);
1175 if (res)
1176 goto err_stop;
1177
1178 ieee80211_set_vif_encap_ops(sdata);
1179 res = ieee80211_check_queues(sdata,
1180 ieee80211_vif_type_p2p(&sdata->vif));
1181 if (res)
1182 goto err_del_interface;
1183 }
1184
1185 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1186 local->fif_pspoll++;
1187 local->fif_probe_req++;
1188
1189 ieee80211_configure_filter(local);
1190 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1191 local->fif_probe_req++;
1192 }
1193
1194 if (sdata->vif.probe_req_reg)
1195 drv_config_iface_filter(local, sdata,
1196 FIF_PROBE_REQ,
1197 FIF_PROBE_REQ);
1198
1199 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1200 sdata->vif.type != NL80211_IFTYPE_NAN)
1201 changed |= ieee80211_reset_erp_info(sdata);
1202 ieee80211_bss_info_change_notify(sdata, changed);
1203
1204 switch (sdata->vif.type) {
1205 case NL80211_IFTYPE_STATION:
1206 case NL80211_IFTYPE_ADHOC:
1207 case NL80211_IFTYPE_AP:
1208 case NL80211_IFTYPE_MESH_POINT:
1209 case NL80211_IFTYPE_OCB:
1210 netif_carrier_off(dev);
1211 break;
1212 case NL80211_IFTYPE_WDS:
1213 case NL80211_IFTYPE_P2P_DEVICE:
1214 case NL80211_IFTYPE_NAN:
1215 break;
1216 default:
1217 /* not reached */
1218 WARN_ON(1);
1219 }
1220
1221 /*
1222 * Set default queue parameters so drivers don't
1223 * need to initialise the hardware if the hardware
1224 * doesn't start up with sane defaults.
1225 * Enable QoS for anything but station interfaces.
1226 */
1227 ieee80211_set_wmm_default(sdata, true,
1228 sdata->vif.type != NL80211_IFTYPE_STATION);
1229 }
1230
1231 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1232
1233 switch (sdata->vif.type) {
1234 case NL80211_IFTYPE_WDS:
1235 /* Create STA entry for the WDS peer */
1236 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
1237 GFP_KERNEL);
1238 if (!sta) {
1239 res = -ENOMEM;
1240 goto err_del_interface;
1241 }
1242
1243 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
1244 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
1245 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
1246
1247 res = sta_info_insert(sta);
1248 if (res) {
1249 /* STA has been freed */
1250 goto err_del_interface;
1251 }
1252
1253 rate_control_rate_init(sta);
1254 netif_carrier_on(dev);
1255 break;
1256 case NL80211_IFTYPE_P2P_DEVICE:
1257 rcu_assign_pointer(local->p2p_sdata, sdata);
1258 break;
1259 case NL80211_IFTYPE_MONITOR:
1260 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1261 break;
1262 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1263 break;
1264 default:
1265 break;
1266 }
1267
1268 /*
1269 * set_multicast_list will be invoked by the networking core
1270 * which will check whether any increments here were done in
1271 * error and sync them down to the hardware as filter flags.
1272 */
1273 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1274 atomic_inc(&local->iff_allmultis);
1275
1276 if (coming_up)
1277 local->open_count++;
1278
1279 if (hw_reconf_flags)
1280 ieee80211_hw_config(local, hw_reconf_flags);
1281
1282 ieee80211_recalc_ps(local);
1283
1284 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1285 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1286 local->ops->wake_tx_queue) {
1287 /* XXX: for AP_VLAN, actually track AP queues */
1288 if (dev)
1289 netif_tx_start_all_queues(dev);
1290 } else if (dev) {
1291 unsigned long flags;
1292 int n_acs = IEEE80211_NUM_ACS;
1293 int ac;
1294
1295 if (local->hw.queues < IEEE80211_NUM_ACS)
1296 n_acs = 1;
1297
1298 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1299 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1300 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1301 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1302 for (ac = 0; ac < n_acs; ac++) {
1303 int ac_queue = sdata->vif.hw_queue[ac];
1304
1305 if (local->queue_stop_reasons[ac_queue] == 0 &&
1306 skb_queue_empty(&local->pending[ac_queue]))
1307 netif_start_subqueue(dev, ac);
1308 }
1309 }
1310 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1311 }
1312
1313 return 0;
1314 err_del_interface:
1315 drv_remove_interface(local, sdata);
1316 err_stop:
1317 if (!local->open_count)
1318 drv_stop(local);
1319 err_del_bss:
1320 sdata->bss = NULL;
1321 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1322 mutex_lock(&local->mtx);
1323 list_del(&sdata->u.vlan.list);
1324 mutex_unlock(&local->mtx);
1325 }
1326 /* might already be clear but that doesn't matter */
1327 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1328 return res;
1329 }
1330
ieee80211_if_free(struct net_device * dev)1331 static void ieee80211_if_free(struct net_device *dev)
1332 {
1333 free_percpu(dev->tstats);
1334 }
1335
ieee80211_if_setup(struct net_device * dev)1336 static void ieee80211_if_setup(struct net_device *dev)
1337 {
1338 ether_setup(dev);
1339 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1340 dev->netdev_ops = &ieee80211_dataif_ops;
1341 dev->needs_free_netdev = true;
1342 dev->priv_destructor = ieee80211_if_free;
1343 }
1344
ieee80211_if_setup_no_queue(struct net_device * dev)1345 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1346 {
1347 ieee80211_if_setup(dev);
1348 dev->priv_flags |= IFF_NO_QUEUE;
1349 }
1350
ieee80211_iface_work(struct work_struct * work)1351 static void ieee80211_iface_work(struct work_struct *work)
1352 {
1353 struct ieee80211_sub_if_data *sdata =
1354 container_of(work, struct ieee80211_sub_if_data, work);
1355 struct ieee80211_local *local = sdata->local;
1356 struct sk_buff *skb;
1357 struct sta_info *sta;
1358
1359 if (!ieee80211_sdata_running(sdata))
1360 return;
1361
1362 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1363 return;
1364
1365 if (!ieee80211_can_run_worker(local))
1366 return;
1367
1368 /* first process frames */
1369 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1370 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1371
1372 if (ieee80211_is_action(mgmt->frame_control) &&
1373 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1374 int len = skb->len;
1375
1376 mutex_lock(&local->sta_mtx);
1377 sta = sta_info_get_bss(sdata, mgmt->sa);
1378 if (sta) {
1379 switch (mgmt->u.action.u.addba_req.action_code) {
1380 case WLAN_ACTION_ADDBA_REQ:
1381 ieee80211_process_addba_request(
1382 local, sta, mgmt, len);
1383 break;
1384 case WLAN_ACTION_ADDBA_RESP:
1385 ieee80211_process_addba_resp(local, sta,
1386 mgmt, len);
1387 break;
1388 case WLAN_ACTION_DELBA:
1389 ieee80211_process_delba(sdata, sta,
1390 mgmt, len);
1391 break;
1392 default:
1393 WARN_ON(1);
1394 break;
1395 }
1396 }
1397 mutex_unlock(&local->sta_mtx);
1398 } else if (ieee80211_is_action(mgmt->frame_control) &&
1399 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1400 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1401 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1402 struct ieee80211_rx_status *status;
1403 enum nl80211_band band;
1404 u8 opmode;
1405
1406 status = IEEE80211_SKB_RXCB(skb);
1407 band = status->band;
1408 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1409
1410 mutex_lock(&local->sta_mtx);
1411 sta = sta_info_get_bss(sdata, mgmt->sa);
1412
1413 if (sta)
1414 ieee80211_vht_handle_opmode(sdata, sta,
1415 opmode,
1416 band);
1417
1418 mutex_unlock(&local->sta_mtx);
1419 break;
1420 }
1421 case WLAN_VHT_ACTION_GROUPID_MGMT:
1422 ieee80211_process_mu_groups(sdata, mgmt);
1423 break;
1424 default:
1425 WARN_ON(1);
1426 break;
1427 }
1428 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1429 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1430 ieee80211_sta_rx_queued_ext(sdata, skb);
1431 else
1432 WARN_ON(1);
1433 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1434 struct ieee80211_hdr *hdr = (void *)mgmt;
1435 /*
1436 * So the frame isn't mgmt, but frame_control
1437 * is at the right place anyway, of course, so
1438 * the if statement is correct.
1439 *
1440 * Warn if we have other data frame types here,
1441 * they must not get here.
1442 */
1443 WARN_ON(hdr->frame_control &
1444 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1445 WARN_ON(!(hdr->seq_ctrl &
1446 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1447 /*
1448 * This was a fragment of a frame, received while
1449 * a block-ack session was active. That cannot be
1450 * right, so terminate the session.
1451 */
1452 mutex_lock(&local->sta_mtx);
1453 sta = sta_info_get_bss(sdata, mgmt->sa);
1454 if (sta) {
1455 u16 tid = ieee80211_get_tid(hdr);
1456
1457 __ieee80211_stop_rx_ba_session(
1458 sta, tid, WLAN_BACK_RECIPIENT,
1459 WLAN_REASON_QSTA_REQUIRE_SETUP,
1460 true);
1461 }
1462 mutex_unlock(&local->sta_mtx);
1463 } else switch (sdata->vif.type) {
1464 case NL80211_IFTYPE_STATION:
1465 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1466 break;
1467 case NL80211_IFTYPE_ADHOC:
1468 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1469 break;
1470 case NL80211_IFTYPE_MESH_POINT:
1471 if (!ieee80211_vif_is_mesh(&sdata->vif))
1472 break;
1473 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1474 break;
1475 default:
1476 WARN(1, "frame for unexpected interface type");
1477 break;
1478 }
1479
1480 kfree_skb(skb);
1481 }
1482
1483 /* then other type-dependent work */
1484 switch (sdata->vif.type) {
1485 case NL80211_IFTYPE_STATION:
1486 ieee80211_sta_work(sdata);
1487 break;
1488 case NL80211_IFTYPE_ADHOC:
1489 ieee80211_ibss_work(sdata);
1490 break;
1491 case NL80211_IFTYPE_MESH_POINT:
1492 if (!ieee80211_vif_is_mesh(&sdata->vif))
1493 break;
1494 ieee80211_mesh_work(sdata);
1495 break;
1496 case NL80211_IFTYPE_OCB:
1497 ieee80211_ocb_work(sdata);
1498 break;
1499 default:
1500 break;
1501 }
1502 }
1503
ieee80211_recalc_smps_work(struct work_struct * work)1504 static void ieee80211_recalc_smps_work(struct work_struct *work)
1505 {
1506 struct ieee80211_sub_if_data *sdata =
1507 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1508
1509 ieee80211_recalc_smps(sdata);
1510 }
1511
1512 /*
1513 * Helper function to initialise an interface to a specific type.
1514 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1515 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1516 enum nl80211_iftype type)
1517 {
1518 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1519 0xff, 0xff, 0xff};
1520
1521 /* clear type-dependent union */
1522 memset(&sdata->u, 0, sizeof(sdata->u));
1523
1524 /* and set some type-dependent values */
1525 sdata->vif.type = type;
1526 sdata->vif.p2p = false;
1527 sdata->wdev.iftype = type;
1528
1529 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1530 sdata->control_port_no_encrypt = false;
1531 sdata->control_port_over_nl80211 = false;
1532 sdata->control_port_no_preauth = false;
1533 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1534 sdata->vif.bss_conf.idle = true;
1535 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1536
1537 sdata->noack_map = 0;
1538
1539 /* only monitor/p2p-device differ */
1540 if (sdata->dev) {
1541 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1542 sdata->dev->type = ARPHRD_ETHER;
1543 }
1544
1545 skb_queue_head_init(&sdata->skb_queue);
1546 INIT_WORK(&sdata->work, ieee80211_iface_work);
1547 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1548 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1549 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1550 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1551
1552 switch (type) {
1553 case NL80211_IFTYPE_P2P_GO:
1554 type = NL80211_IFTYPE_AP;
1555 sdata->vif.type = type;
1556 sdata->vif.p2p = true;
1557 fallthrough;
1558 case NL80211_IFTYPE_AP:
1559 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1560 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1561 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1562 break;
1563 case NL80211_IFTYPE_P2P_CLIENT:
1564 type = NL80211_IFTYPE_STATION;
1565 sdata->vif.type = type;
1566 sdata->vif.p2p = true;
1567 fallthrough;
1568 case NL80211_IFTYPE_STATION:
1569 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1570 ieee80211_sta_setup_sdata(sdata);
1571 break;
1572 case NL80211_IFTYPE_OCB:
1573 sdata->vif.bss_conf.bssid = bssid_wildcard;
1574 ieee80211_ocb_setup_sdata(sdata);
1575 break;
1576 case NL80211_IFTYPE_ADHOC:
1577 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1578 ieee80211_ibss_setup_sdata(sdata);
1579 break;
1580 case NL80211_IFTYPE_MESH_POINT:
1581 if (ieee80211_vif_is_mesh(&sdata->vif))
1582 ieee80211_mesh_init_sdata(sdata);
1583 break;
1584 case NL80211_IFTYPE_MONITOR:
1585 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1586 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1587 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1588 MONITOR_FLAG_OTHER_BSS;
1589 break;
1590 case NL80211_IFTYPE_WDS:
1591 sdata->vif.bss_conf.bssid = NULL;
1592 break;
1593 case NL80211_IFTYPE_NAN:
1594 idr_init(&sdata->u.nan.function_inst_ids);
1595 spin_lock_init(&sdata->u.nan.func_lock);
1596 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1597 break;
1598 case NL80211_IFTYPE_AP_VLAN:
1599 case NL80211_IFTYPE_P2P_DEVICE:
1600 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1601 break;
1602 case NL80211_IFTYPE_UNSPECIFIED:
1603 case NUM_NL80211_IFTYPES:
1604 WARN_ON(1);
1605 break;
1606 }
1607
1608 ieee80211_debugfs_add_netdev(sdata);
1609 }
1610
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1611 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1612 enum nl80211_iftype type)
1613 {
1614 struct ieee80211_local *local = sdata->local;
1615 int ret, err;
1616 enum nl80211_iftype internal_type = type;
1617 bool p2p = false;
1618
1619 ASSERT_RTNL();
1620
1621 if (!local->ops->change_interface)
1622 return -EBUSY;
1623
1624 switch (sdata->vif.type) {
1625 case NL80211_IFTYPE_AP:
1626 case NL80211_IFTYPE_STATION:
1627 case NL80211_IFTYPE_ADHOC:
1628 case NL80211_IFTYPE_OCB:
1629 /*
1630 * Could maybe also all others here?
1631 * Just not sure how that interacts
1632 * with the RX/config path e.g. for
1633 * mesh.
1634 */
1635 break;
1636 default:
1637 return -EBUSY;
1638 }
1639
1640 switch (type) {
1641 case NL80211_IFTYPE_AP:
1642 case NL80211_IFTYPE_STATION:
1643 case NL80211_IFTYPE_ADHOC:
1644 case NL80211_IFTYPE_OCB:
1645 /*
1646 * Could probably support everything
1647 * but WDS here (WDS do_open can fail
1648 * under memory pressure, which this
1649 * code isn't prepared to handle).
1650 */
1651 break;
1652 case NL80211_IFTYPE_P2P_CLIENT:
1653 p2p = true;
1654 internal_type = NL80211_IFTYPE_STATION;
1655 break;
1656 case NL80211_IFTYPE_P2P_GO:
1657 p2p = true;
1658 internal_type = NL80211_IFTYPE_AP;
1659 break;
1660 default:
1661 return -EBUSY;
1662 }
1663
1664 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1665 if (ret)
1666 return ret;
1667
1668 ieee80211_stop_vif_queues(local, sdata,
1669 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1670 synchronize_net();
1671
1672 ieee80211_do_stop(sdata, false);
1673
1674 ieee80211_teardown_sdata(sdata);
1675
1676 ieee80211_set_sdata_offload_flags(sdata);
1677 ret = drv_change_interface(local, sdata, internal_type, p2p);
1678 if (ret)
1679 type = ieee80211_vif_type_p2p(&sdata->vif);
1680
1681 /*
1682 * Ignore return value here, there's not much we can do since
1683 * the driver changed the interface type internally already.
1684 * The warnings will hopefully make driver authors fix it :-)
1685 */
1686 ieee80211_check_queues(sdata, type);
1687
1688 ieee80211_setup_sdata(sdata, type);
1689 ieee80211_set_vif_encap_ops(sdata);
1690
1691 err = ieee80211_do_open(&sdata->wdev, false);
1692 WARN(err, "type change: do_open returned %d", err);
1693
1694 ieee80211_wake_vif_queues(local, sdata,
1695 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1696 return ret;
1697 }
1698
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1699 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1700 enum nl80211_iftype type)
1701 {
1702 int ret;
1703
1704 ASSERT_RTNL();
1705
1706 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1707 return 0;
1708
1709 if (ieee80211_sdata_running(sdata)) {
1710 ret = ieee80211_runtime_change_iftype(sdata, type);
1711 if (ret)
1712 return ret;
1713 } else {
1714 /* Purge and reset type-dependent state. */
1715 ieee80211_teardown_sdata(sdata);
1716 ieee80211_setup_sdata(sdata, type);
1717 }
1718
1719 /* reset some values that shouldn't be kept across type changes */
1720 if (type == NL80211_IFTYPE_STATION)
1721 sdata->u.mgd.use_4addr = false;
1722
1723 return 0;
1724 }
1725
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1726 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1727 u8 *perm_addr, enum nl80211_iftype type)
1728 {
1729 struct ieee80211_sub_if_data *sdata;
1730 u64 mask, start, addr, val, inc;
1731 u8 *m;
1732 u8 tmp_addr[ETH_ALEN];
1733 int i;
1734
1735 /* default ... something at least */
1736 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1737
1738 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1739 local->hw.wiphy->n_addresses <= 1)
1740 return;
1741
1742 mutex_lock(&local->iflist_mtx);
1743
1744 switch (type) {
1745 case NL80211_IFTYPE_MONITOR:
1746 /* doesn't matter */
1747 break;
1748 case NL80211_IFTYPE_WDS:
1749 case NL80211_IFTYPE_AP_VLAN:
1750 /* match up with an AP interface */
1751 list_for_each_entry(sdata, &local->interfaces, list) {
1752 if (sdata->vif.type != NL80211_IFTYPE_AP)
1753 continue;
1754 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1755 break;
1756 }
1757 /* keep default if no AP interface present */
1758 break;
1759 case NL80211_IFTYPE_P2P_CLIENT:
1760 case NL80211_IFTYPE_P2P_GO:
1761 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1762 list_for_each_entry(sdata, &local->interfaces, list) {
1763 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1764 continue;
1765 if (!ieee80211_sdata_running(sdata))
1766 continue;
1767 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1768 goto out_unlock;
1769 }
1770 }
1771 fallthrough;
1772 default:
1773 /* assign a new address if possible -- try n_addresses first */
1774 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1775 bool used = false;
1776
1777 list_for_each_entry(sdata, &local->interfaces, list) {
1778 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1779 sdata->vif.addr)) {
1780 used = true;
1781 break;
1782 }
1783 }
1784
1785 if (!used) {
1786 memcpy(perm_addr,
1787 local->hw.wiphy->addresses[i].addr,
1788 ETH_ALEN);
1789 break;
1790 }
1791 }
1792
1793 /* try mask if available */
1794 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1795 break;
1796
1797 m = local->hw.wiphy->addr_mask;
1798 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1799 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1800 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1801
1802 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1803 /* not a contiguous mask ... not handled now! */
1804 pr_info("not contiguous\n");
1805 break;
1806 }
1807
1808 /*
1809 * Pick address of existing interface in case user changed
1810 * MAC address manually, default to perm_addr.
1811 */
1812 m = local->hw.wiphy->perm_addr;
1813 list_for_each_entry(sdata, &local->interfaces, list) {
1814 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1815 continue;
1816 m = sdata->vif.addr;
1817 break;
1818 }
1819 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1820 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1821 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1822
1823 inc = 1ULL<<__ffs64(mask);
1824 val = (start & mask);
1825 addr = (start & ~mask) | (val & mask);
1826 do {
1827 bool used = false;
1828
1829 tmp_addr[5] = addr >> 0*8;
1830 tmp_addr[4] = addr >> 1*8;
1831 tmp_addr[3] = addr >> 2*8;
1832 tmp_addr[2] = addr >> 3*8;
1833 tmp_addr[1] = addr >> 4*8;
1834 tmp_addr[0] = addr >> 5*8;
1835
1836 val += inc;
1837
1838 list_for_each_entry(sdata, &local->interfaces, list) {
1839 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1840 used = true;
1841 break;
1842 }
1843 }
1844
1845 if (!used) {
1846 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1847 break;
1848 }
1849 addr = (start & ~mask) | (val & mask);
1850 } while (addr != start);
1851
1852 break;
1853 }
1854
1855 out_unlock:
1856 mutex_unlock(&local->iflist_mtx);
1857 }
1858
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)1859 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1860 unsigned char name_assign_type,
1861 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1862 struct vif_params *params)
1863 {
1864 struct net_device *ndev = NULL;
1865 struct ieee80211_sub_if_data *sdata = NULL;
1866 struct txq_info *txqi;
1867 void (*if_setup)(struct net_device *dev);
1868 int ret, i;
1869 int txqs = 1;
1870
1871 ASSERT_RTNL();
1872
1873 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1874 struct wireless_dev *wdev;
1875
1876 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1877 GFP_KERNEL);
1878 if (!sdata)
1879 return -ENOMEM;
1880 wdev = &sdata->wdev;
1881
1882 sdata->dev = NULL;
1883 strlcpy(sdata->name, name, IFNAMSIZ);
1884 ieee80211_assign_perm_addr(local, wdev->address, type);
1885 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1886 } else {
1887 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1888 sizeof(void *));
1889 int txq_size = 0;
1890
1891 if (local->ops->wake_tx_queue &&
1892 type != NL80211_IFTYPE_AP_VLAN &&
1893 (type != NL80211_IFTYPE_MONITOR ||
1894 (params->flags & MONITOR_FLAG_ACTIVE)))
1895 txq_size += sizeof(struct txq_info) +
1896 local->hw.txq_data_size;
1897
1898 if (local->ops->wake_tx_queue) {
1899 if_setup = ieee80211_if_setup_no_queue;
1900 } else {
1901 if_setup = ieee80211_if_setup;
1902 if (local->hw.queues >= IEEE80211_NUM_ACS)
1903 txqs = IEEE80211_NUM_ACS;
1904 }
1905
1906 ndev = alloc_netdev_mqs(size + txq_size,
1907 name, name_assign_type,
1908 if_setup, txqs, 1);
1909 if (!ndev)
1910 return -ENOMEM;
1911
1912 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1913 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1914
1915 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1916
1917 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1918 if (!ndev->tstats) {
1919 free_netdev(ndev);
1920 return -ENOMEM;
1921 }
1922
1923 ndev->needed_headroom = local->tx_headroom +
1924 4*6 /* four MAC addresses */
1925 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1926 + 6 /* mesh */
1927 + 8 /* rfc1042/bridge tunnel */
1928 - ETH_HLEN /* ethernet hard_header_len */
1929 + IEEE80211_ENCRYPT_HEADROOM;
1930 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1931
1932 ret = dev_alloc_name(ndev, ndev->name);
1933 if (ret < 0) {
1934 ieee80211_if_free(ndev);
1935 free_netdev(ndev);
1936 return ret;
1937 }
1938
1939 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1940 if (is_valid_ether_addr(params->macaddr))
1941 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1942 else
1943 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1944 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1945
1946 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1947 sdata = netdev_priv(ndev);
1948 ndev->ieee80211_ptr = &sdata->wdev;
1949 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1950 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1951
1952 if (txq_size) {
1953 txqi = netdev_priv(ndev) + size;
1954 ieee80211_txq_init(sdata, NULL, txqi, 0);
1955 }
1956
1957 sdata->dev = ndev;
1958 }
1959
1960 /* initialise type-independent data */
1961 sdata->wdev.wiphy = local->hw.wiphy;
1962 sdata->local = local;
1963
1964 ieee80211_init_frag_cache(&sdata->frags);
1965
1966 INIT_LIST_HEAD(&sdata->key_list);
1967
1968 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1969 ieee80211_dfs_cac_timer_work);
1970 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1971 ieee80211_delayed_tailroom_dec);
1972
1973 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1974 struct ieee80211_supported_band *sband;
1975 sband = local->hw.wiphy->bands[i];
1976 sdata->rc_rateidx_mask[i] =
1977 sband ? (1 << sband->n_bitrates) - 1 : 0;
1978 if (sband) {
1979 __le16 cap;
1980 u16 *vht_rate_mask;
1981
1982 memcpy(sdata->rc_rateidx_mcs_mask[i],
1983 sband->ht_cap.mcs.rx_mask,
1984 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1985
1986 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1987 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1988 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1989 } else {
1990 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1991 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1992 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1993 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1994 }
1995 }
1996
1997 ieee80211_set_default_queues(sdata);
1998
1999 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2000 sdata->user_power_level = local->user_power_level;
2001
2002 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2003
2004 /* setup type-dependent data */
2005 ieee80211_setup_sdata(sdata, type);
2006
2007 if (ndev) {
2008 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2009 if (type == NL80211_IFTYPE_STATION)
2010 sdata->u.mgd.use_4addr = params->use_4addr;
2011
2012 ndev->features |= local->hw.netdev_features;
2013 ndev->hw_features |= ndev->features &
2014 MAC80211_SUPPORTED_FEATURES_TX;
2015
2016 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2017
2018 /* MTU range is normally 256 - 2304, where the upper limit is
2019 * the maximum MSDU size. Monitor interfaces send and receive
2020 * MPDU and A-MSDU frames which may be much larger so we do
2021 * not impose an upper limit in that case.
2022 */
2023 ndev->min_mtu = 256;
2024 if (type == NL80211_IFTYPE_MONITOR)
2025 ndev->max_mtu = 0;
2026 else
2027 ndev->max_mtu = local->hw.max_mtu;
2028
2029 ret = register_netdevice(ndev);
2030 if (ret) {
2031 free_netdev(ndev);
2032 return ret;
2033 }
2034 }
2035
2036 mutex_lock(&local->iflist_mtx);
2037 list_add_tail_rcu(&sdata->list, &local->interfaces);
2038 mutex_unlock(&local->iflist_mtx);
2039
2040 if (new_wdev)
2041 *new_wdev = &sdata->wdev;
2042
2043 return 0;
2044 }
2045
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2046 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2047 {
2048 ASSERT_RTNL();
2049
2050 mutex_lock(&sdata->local->iflist_mtx);
2051 list_del_rcu(&sdata->list);
2052 mutex_unlock(&sdata->local->iflist_mtx);
2053
2054 if (sdata->vif.txq)
2055 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2056
2057 synchronize_rcu();
2058
2059 if (sdata->dev) {
2060 unregister_netdevice(sdata->dev);
2061 } else {
2062 cfg80211_unregister_wdev(&sdata->wdev);
2063 ieee80211_teardown_sdata(sdata);
2064 kfree(sdata);
2065 }
2066 }
2067
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2068 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2069 {
2070 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2071 return;
2072 ieee80211_do_stop(sdata, true);
2073 }
2074
ieee80211_remove_interfaces(struct ieee80211_local * local)2075 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2076 {
2077 struct ieee80211_sub_if_data *sdata, *tmp;
2078 LIST_HEAD(unreg_list);
2079 LIST_HEAD(wdev_list);
2080
2081 ASSERT_RTNL();
2082
2083 /* Before destroying the interfaces, make sure they're all stopped so
2084 * that the hardware is stopped. Otherwise, the driver might still be
2085 * iterating the interfaces during the shutdown, e.g. from a worker
2086 * or from RX processing or similar, and if it does so (using atomic
2087 * iteration) while we're manipulating the list, the iteration will
2088 * crash.
2089 *
2090 * After this, the hardware should be stopped and the driver should
2091 * have stopped all of its activities, so that we can do RCU-unaware
2092 * manipulations of the interface list below.
2093 */
2094 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2095
2096 WARN(local->open_count, "%s: open count remains %d\n",
2097 wiphy_name(local->hw.wiphy), local->open_count);
2098
2099 ieee80211_txq_teardown_flows(local);
2100
2101 mutex_lock(&local->iflist_mtx);
2102 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2103 list_del(&sdata->list);
2104
2105 if (sdata->dev)
2106 unregister_netdevice_queue(sdata->dev, &unreg_list);
2107 else
2108 list_add(&sdata->list, &wdev_list);
2109 }
2110 mutex_unlock(&local->iflist_mtx);
2111 unregister_netdevice_many(&unreg_list);
2112
2113 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2114 list_del(&sdata->list);
2115 cfg80211_unregister_wdev(&sdata->wdev);
2116 kfree(sdata);
2117 }
2118 }
2119
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2120 static int netdev_notify(struct notifier_block *nb,
2121 unsigned long state, void *ptr)
2122 {
2123 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2124 struct ieee80211_sub_if_data *sdata;
2125
2126 if (state != NETDEV_CHANGENAME)
2127 return NOTIFY_DONE;
2128
2129 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2130 return NOTIFY_DONE;
2131
2132 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2133 return NOTIFY_DONE;
2134
2135 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2136 memcpy(sdata->name, dev->name, IFNAMSIZ);
2137 ieee80211_debugfs_rename_netdev(sdata);
2138
2139 return NOTIFY_OK;
2140 }
2141
2142 static struct notifier_block mac80211_netdev_notifier = {
2143 .notifier_call = netdev_notify,
2144 };
2145
ieee80211_iface_init(void)2146 int ieee80211_iface_init(void)
2147 {
2148 return register_netdevice_notifier(&mac80211_netdev_notifier);
2149 }
2150
ieee80211_iface_exit(void)2151 void ieee80211_iface_exit(void)
2152 {
2153 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2154 }
2155
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2156 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2157 {
2158 if (sdata->vif.type == NL80211_IFTYPE_AP)
2159 atomic_inc(&sdata->u.ap.num_mcast_sta);
2160 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2161 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2162 }
2163
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2164 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2165 {
2166 if (sdata->vif.type == NL80211_IFTYPE_AP)
2167 atomic_dec(&sdata->u.ap.num_mcast_sta);
2168 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2169 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2170 }
2171