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 <linux/kcov.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29
30 /**
31 * DOC: Interface list locking
32 *
33 * The interface list in each struct ieee80211_local is protected
34 * three-fold:
35 *
36 * (1) modifications may only be done under the RTNL
37 * (2) modifications and readers are protected against each other by
38 * the iflist_mtx.
39 * (3) modifications are done in an RCU manner so atomic readers
40 * can traverse the list in RCU-safe blocks.
41 *
42 * As a consequence, reads (traversals) of the list can be protected
43 * by either the RTNL, the iflist_mtx or RCU.
44 */
45
46 static void ieee80211_iface_work(struct work_struct *work);
47
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
49 {
50 struct ieee80211_chanctx_conf *chanctx_conf;
51 int power;
52
53 rcu_read_lock();
54 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
55 if (!chanctx_conf) {
56 rcu_read_unlock();
57 return false;
58 }
59
60 power = ieee80211_chandef_max_power(&chanctx_conf->def);
61 rcu_read_unlock();
62
63 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->user_power_level);
65
66 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 power = min(power, sdata->ap_power_level);
68
69 if (power != sdata->vif.bss_conf.txpower) {
70 sdata->vif.bss_conf.txpower = power;
71 ieee80211_hw_config(sdata->local, 0);
72 return true;
73 }
74
75 return false;
76 }
77
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
79 bool update_bss)
80 {
81 if (__ieee80211_recalc_txpower(sdata) ||
82 (update_bss && ieee80211_sdata_running(sdata)))
83 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
84 }
85
__ieee80211_idle_off(struct ieee80211_local * local)86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
87 {
88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
89 return 0;
90
91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
92 return IEEE80211_CONF_CHANGE_IDLE;
93 }
94
__ieee80211_idle_on(struct ieee80211_local * local)95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
96 {
97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
98 return 0;
99
100 ieee80211_flush_queues(local, NULL, false);
101
102 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103 return IEEE80211_CONF_CHANGE_IDLE;
104 }
105
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107 bool force_active)
108 {
109 bool working, scanning, active;
110 unsigned int led_trig_start = 0, led_trig_stop = 0;
111
112 lockdep_assert_held(&local->mtx);
113
114 active = force_active ||
115 !list_empty(&local->chanctx_list) ||
116 local->monitors;
117
118 working = !local->ops->remain_on_channel &&
119 !list_empty(&local->roc_list);
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
ieee80211_idle_off(struct ieee80211_local * local)141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
ieee80211_recalc_idle(struct ieee80211_local * local)146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
154 bool check_dup)
155 {
156 struct ieee80211_local *local = sdata->local;
157 struct ieee80211_sub_if_data *iter;
158 u64 new, mask, tmp;
159 u8 *m;
160 int ret = 0;
161
162 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
163 return 0;
164
165 m = addr;
166 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
167 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
168 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
169
170 m = local->hw.wiphy->addr_mask;
171 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174
175 if (!check_dup)
176 return ret;
177
178 mutex_lock(&local->iflist_mtx);
179 list_for_each_entry(iter, &local->interfaces, list) {
180 if (iter == sdata)
181 continue;
182
183 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
184 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
185 continue;
186
187 m = iter->vif.addr;
188 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
189 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
190 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
191
192 if ((new & ~mask) != (tmp & ~mask)) {
193 ret = -EINVAL;
194 break;
195 }
196 }
197 mutex_unlock(&local->iflist_mtx);
198
199 return ret;
200 }
201
ieee80211_change_mac(struct net_device * dev,void * addr)202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
203 {
204 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
205 struct sockaddr *sa = addr;
206 bool check_dup = true;
207 int ret;
208
209 if (ieee80211_sdata_running(sdata))
210 return -EBUSY;
211
212 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
213 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
214 check_dup = false;
215
216 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
217 if (ret)
218 return ret;
219
220 ret = eth_mac_addr(dev, sa);
221
222 if (ret == 0)
223 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
224
225 return ret;
226 }
227
identical_mac_addr_allowed(int type1,int type2)228 static inline int identical_mac_addr_allowed(int type1, int type2)
229 {
230 return type1 == NL80211_IFTYPE_MONITOR ||
231 type2 == NL80211_IFTYPE_MONITOR ||
232 type1 == NL80211_IFTYPE_P2P_DEVICE ||
233 type2 == NL80211_IFTYPE_P2P_DEVICE ||
234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
235 (type1 == NL80211_IFTYPE_AP_VLAN &&
236 (type2 == NL80211_IFTYPE_AP ||
237 type2 == NL80211_IFTYPE_AP_VLAN));
238 }
239
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
241 enum nl80211_iftype iftype)
242 {
243 struct ieee80211_local *local = sdata->local;
244 struct ieee80211_sub_if_data *nsdata;
245 int ret;
246
247 ASSERT_RTNL();
248
249 /* we hold the RTNL here so can safely walk the list */
250 list_for_each_entry(nsdata, &local->interfaces, list) {
251 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
252 /*
253 * Only OCB and monitor mode may coexist
254 */
255 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
256 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
257 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
258 nsdata->vif.type == NL80211_IFTYPE_OCB))
259 return -EBUSY;
260
261 /*
262 * Allow only a single IBSS interface to be up at any
263 * time. This is restricted because beacon distribution
264 * cannot work properly if both are in the same IBSS.
265 *
266 * To remove this restriction we'd have to disallow them
267 * from setting the same SSID on different IBSS interfaces
268 * belonging to the same hardware. Then, however, we're
269 * faced with having to adopt two different TSF timers...
270 */
271 if (iftype == NL80211_IFTYPE_ADHOC &&
272 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
273 return -EBUSY;
274 /*
275 * will not add another interface while any channel
276 * switch is active.
277 */
278 if (nsdata->vif.csa_active)
279 return -EBUSY;
280
281 /*
282 * The remaining checks are only performed for interfaces
283 * with the same MAC address.
284 */
285 if (!ether_addr_equal(sdata->vif.addr,
286 nsdata->vif.addr))
287 continue;
288
289 /*
290 * check whether it may have the same address
291 */
292 if (!identical_mac_addr_allowed(iftype,
293 nsdata->vif.type))
294 return -ENOTUNIQ;
295
296 /*
297 * can only add VLANs to enabled APs
298 */
299 if (iftype == NL80211_IFTYPE_AP_VLAN &&
300 nsdata->vif.type == NL80211_IFTYPE_AP)
301 sdata->bss = &nsdata->u.ap;
302 }
303 }
304
305 mutex_lock(&local->chanctx_mtx);
306 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
307 mutex_unlock(&local->chanctx_mtx);
308 return ret;
309 }
310
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype == NL80211_IFTYPE_NAN)
318 return 0;
319
320 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
321 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
323 IEEE80211_INVAL_HW_QUEUE))
324 return -EINVAL;
325 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
326 n_queues))
327 return -EINVAL;
328 }
329 }
330
331 if ((iftype != NL80211_IFTYPE_AP &&
332 iftype != NL80211_IFTYPE_P2P_GO &&
333 iftype != NL80211_IFTYPE_MESH_POINT) ||
334 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
335 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
336 return 0;
337 }
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
340 return -EINVAL;
341
342 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
343 return -EINVAL;
344
345 return 0;
346 }
347
ieee80211_open(struct net_device * dev)348 static int ieee80211_open(struct net_device *dev)
349 {
350 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
351 int err;
352
353 /* fail early if user set an invalid address */
354 if (!is_valid_ether_addr(dev->dev_addr))
355 return -EADDRNOTAVAIL;
356
357 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
358 if (err)
359 return err;
360
361 wiphy_lock(sdata->local->hw.wiphy);
362 err = ieee80211_do_open(&sdata->wdev, true);
363 wiphy_unlock(sdata->local->hw.wiphy);
364
365 return err;
366 }
367
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
369 {
370 struct ieee80211_local *local = sdata->local;
371 unsigned long flags;
372 struct sk_buff *skb, *tmp;
373 u32 hw_reconf_flags = 0;
374 int i, flushed;
375 struct ps_data *ps;
376 struct cfg80211_chan_def chandef;
377 bool cancel_scan;
378 struct cfg80211_nan_func *func;
379
380 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
381
382 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
383 if (cancel_scan)
384 ieee80211_scan_cancel(local);
385
386 /*
387 * Stop TX on this interface first.
388 */
389 if (sdata->dev)
390 netif_tx_stop_all_queues(sdata->dev);
391
392 ieee80211_roc_purge(local, sdata);
393
394 switch (sdata->vif.type) {
395 case NL80211_IFTYPE_STATION:
396 ieee80211_mgd_stop(sdata);
397 break;
398 case NL80211_IFTYPE_ADHOC:
399 ieee80211_ibss_stop(sdata);
400 break;
401 case NL80211_IFTYPE_MONITOR:
402 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
403 break;
404 list_del_rcu(&sdata->u.mntr.list);
405 break;
406 default:
407 break;
408 }
409
410 /*
411 * Remove all stations associated with this interface.
412 *
413 * This must be done before calling ops->remove_interface()
414 * because otherwise we can later invoke ops->sta_notify()
415 * whenever the STAs are removed, and that invalidates driver
416 * assumptions about always getting a vif pointer that is valid
417 * (because if we remove a STA after ops->remove_interface()
418 * the driver will have removed the vif info already!)
419 *
420 * For AP_VLANs stations may exist since there's nothing else that
421 * would have removed them, but in other modes there shouldn't
422 * be any stations.
423 */
424 flushed = sta_info_flush(sdata);
425 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
426
427 /* don't count this interface for allmulti while it is down */
428 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
429 atomic_dec(&local->iff_allmultis);
430
431 if (sdata->vif.type == NL80211_IFTYPE_AP) {
432 local->fif_pspoll--;
433 local->fif_probe_req--;
434 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
435 local->fif_probe_req--;
436 }
437
438 if (sdata->dev) {
439 netif_addr_lock_bh(sdata->dev);
440 spin_lock_bh(&local->filter_lock);
441 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
442 sdata->dev->addr_len);
443 spin_unlock_bh(&local->filter_lock);
444 netif_addr_unlock_bh(sdata->dev);
445 }
446
447 del_timer_sync(&local->dynamic_ps_timer);
448 cancel_work_sync(&local->dynamic_ps_enable_work);
449
450 cancel_work_sync(&sdata->recalc_smps);
451 sdata_lock(sdata);
452 mutex_lock(&local->mtx);
453 sdata->vif.csa_active = false;
454 if (sdata->vif.type == NL80211_IFTYPE_STATION)
455 sdata->u.mgd.csa_waiting_bcn = false;
456 if (sdata->csa_block_tx) {
457 ieee80211_wake_vif_queues(local, sdata,
458 IEEE80211_QUEUE_STOP_REASON_CSA);
459 sdata->csa_block_tx = false;
460 }
461 mutex_unlock(&local->mtx);
462 sdata_unlock(sdata);
463
464 cancel_work_sync(&sdata->csa_finalize_work);
465
466 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
467
468 if (sdata->wdev.cac_started) {
469 chandef = sdata->vif.bss_conf.chandef;
470 WARN_ON(local->suspended);
471 mutex_lock(&local->mtx);
472 ieee80211_vif_release_channel(sdata);
473 mutex_unlock(&local->mtx);
474 cfg80211_cac_event(sdata->dev, &chandef,
475 NL80211_RADAR_CAC_ABORTED,
476 GFP_KERNEL);
477 }
478
479 /* APs need special treatment */
480 if (sdata->vif.type == NL80211_IFTYPE_AP) {
481 struct ieee80211_sub_if_data *vlan, *tmpsdata;
482
483 /* down all dependent devices, that is VLANs */
484 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
485 u.vlan.list)
486 dev_close(vlan->dev);
487 WARN_ON(!list_empty(&sdata->u.ap.vlans));
488 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
489 /* remove all packets in parent bc_buf pointing to this dev */
490 ps = &sdata->bss->ps;
491
492 spin_lock_irqsave(&ps->bc_buf.lock, flags);
493 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
494 if (skb->dev == sdata->dev) {
495 __skb_unlink(skb, &ps->bc_buf);
496 local->total_ps_buffered--;
497 ieee80211_free_txskb(&local->hw, skb);
498 }
499 }
500 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
501 }
502
503 if (going_down)
504 local->open_count--;
505
506 switch (sdata->vif.type) {
507 case NL80211_IFTYPE_AP_VLAN:
508 mutex_lock(&local->mtx);
509 list_del(&sdata->u.vlan.list);
510 mutex_unlock(&local->mtx);
511 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
512 /* see comment in the default case below */
513 ieee80211_free_keys(sdata, true);
514 /* no need to tell driver */
515 break;
516 case NL80211_IFTYPE_MONITOR:
517 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
518 local->cooked_mntrs--;
519 break;
520 }
521
522 local->monitors--;
523 if (local->monitors == 0) {
524 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
525 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
526 }
527
528 ieee80211_adjust_monitor_flags(sdata, -1);
529 break;
530 case NL80211_IFTYPE_NAN:
531 /* clean all the functions */
532 spin_lock_bh(&sdata->u.nan.func_lock);
533
534 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
535 idr_remove(&sdata->u.nan.function_inst_ids, i);
536 cfg80211_free_nan_func(func);
537 }
538 idr_destroy(&sdata->u.nan.function_inst_ids);
539
540 spin_unlock_bh(&sdata->u.nan.func_lock);
541 break;
542 case NL80211_IFTYPE_P2P_DEVICE:
543 /* relies on synchronize_rcu() below */
544 RCU_INIT_POINTER(local->p2p_sdata, NULL);
545 fallthrough;
546 default:
547 cancel_work_sync(&sdata->work);
548 /*
549 * When we get here, the interface is marked down.
550 * Free the remaining keys, if there are any
551 * (which can happen in AP mode if userspace sets
552 * keys before the interface is operating)
553 *
554 * Force the key freeing to always synchronize_net()
555 * to wait for the RX path in case it is using this
556 * interface enqueuing frames at this very time on
557 * another CPU.
558 */
559 ieee80211_free_keys(sdata, true);
560 skb_queue_purge(&sdata->skb_queue);
561 }
562
563 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
564 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
565 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
566 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
567 if (info->control.vif == &sdata->vif) {
568 __skb_unlink(skb, &local->pending[i]);
569 ieee80211_free_txskb(&local->hw, skb);
570 }
571 }
572 }
573 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
574
575 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
576 ieee80211_txq_remove_vlan(local, sdata);
577
578 sdata->bss = NULL;
579
580 if (local->open_count == 0)
581 ieee80211_clear_tx_pending(local);
582
583 sdata->vif.bss_conf.beacon_int = 0;
584
585 /*
586 * If the interface goes down while suspended, presumably because
587 * the device was unplugged and that happens before our resume,
588 * then the driver is already unconfigured and the remainder of
589 * this function isn't needed.
590 * XXX: what about WoWLAN? If the device has software state, e.g.
591 * memory allocated, it might expect teardown commands from
592 * mac80211 here?
593 */
594 if (local->suspended) {
595 WARN_ON(local->wowlan);
596 WARN_ON(rtnl_dereference(local->monitor_sdata));
597 return;
598 }
599
600 switch (sdata->vif.type) {
601 case NL80211_IFTYPE_AP_VLAN:
602 break;
603 case NL80211_IFTYPE_MONITOR:
604 if (local->monitors == 0)
605 ieee80211_del_virtual_monitor(local);
606
607 mutex_lock(&local->mtx);
608 ieee80211_recalc_idle(local);
609 mutex_unlock(&local->mtx);
610
611 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
612 break;
613
614 fallthrough;
615 default:
616 if (going_down)
617 drv_remove_interface(local, sdata);
618 }
619
620 ieee80211_recalc_ps(local);
621
622 if (cancel_scan)
623 flush_delayed_work(&local->scan_work);
624
625 if (local->open_count == 0) {
626 ieee80211_stop_device(local);
627
628 /* no reconfiguring after stop! */
629 return;
630 }
631
632 /* do after stop to avoid reconfiguring when we stop anyway */
633 ieee80211_configure_filter(local);
634 ieee80211_hw_config(local, hw_reconf_flags);
635
636 if (local->monitors == local->open_count)
637 ieee80211_add_virtual_monitor(local);
638 }
639
ieee80211_stop(struct net_device * dev)640 static int ieee80211_stop(struct net_device *dev)
641 {
642 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
643
644 wiphy_lock(sdata->local->hw.wiphy);
645 ieee80211_do_stop(sdata, true);
646 wiphy_unlock(sdata->local->hw.wiphy);
647
648 return 0;
649 }
650
ieee80211_set_multicast_list(struct net_device * dev)651 static void ieee80211_set_multicast_list(struct net_device *dev)
652 {
653 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
654 struct ieee80211_local *local = sdata->local;
655 int allmulti, sdata_allmulti;
656
657 allmulti = !!(dev->flags & IFF_ALLMULTI);
658 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
659
660 if (allmulti != sdata_allmulti) {
661 if (dev->flags & IFF_ALLMULTI)
662 atomic_inc(&local->iff_allmultis);
663 else
664 atomic_dec(&local->iff_allmultis);
665 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
666 }
667
668 spin_lock_bh(&local->filter_lock);
669 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
670 spin_unlock_bh(&local->filter_lock);
671 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
672 }
673
674 /*
675 * Called when the netdev is removed or, by the code below, before
676 * the interface type changes.
677 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)678 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
679 {
680 int i;
681
682 /* free extra data */
683 ieee80211_free_keys(sdata, false);
684
685 ieee80211_debugfs_remove_netdev(sdata);
686
687 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
688 __skb_queue_purge(&sdata->fragments[i].skb_list);
689 sdata->fragment_next = 0;
690
691 if (ieee80211_vif_is_mesh(&sdata->vif))
692 ieee80211_mesh_teardown_sdata(sdata);
693 }
694
ieee80211_uninit(struct net_device * dev)695 static void ieee80211_uninit(struct net_device *dev)
696 {
697 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
698 }
699
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)700 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
701 struct sk_buff *skb,
702 struct net_device *sb_dev)
703 {
704 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
705 }
706
707 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)708 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
709 {
710 dev_fetch_sw_netstats(stats, dev->tstats);
711 }
712
713 static const struct net_device_ops ieee80211_dataif_ops = {
714 .ndo_open = ieee80211_open,
715 .ndo_stop = ieee80211_stop,
716 .ndo_uninit = ieee80211_uninit,
717 .ndo_start_xmit = ieee80211_subif_start_xmit,
718 .ndo_set_rx_mode = ieee80211_set_multicast_list,
719 .ndo_set_mac_address = ieee80211_change_mac,
720 .ndo_select_queue = ieee80211_netdev_select_queue,
721 .ndo_get_stats64 = ieee80211_get_stats64,
722 };
723
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)724 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
725 struct sk_buff *skb,
726 struct net_device *sb_dev)
727 {
728 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
729 struct ieee80211_local *local = sdata->local;
730 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
731 struct ieee80211_hdr *hdr;
732 int len_rthdr;
733
734 if (local->hw.queues < IEEE80211_NUM_ACS)
735 return 0;
736
737 /* reset flags and info before parsing radiotap header */
738 memset(info, 0, sizeof(*info));
739
740 if (!ieee80211_parse_tx_radiotap(skb, dev))
741 return 0; /* doesn't matter, frame will be dropped */
742
743 len_rthdr = ieee80211_get_radiotap_len(skb->data);
744 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
745 if (skb->len < len_rthdr + 2 ||
746 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
747 return 0; /* doesn't matter, frame will be dropped */
748
749 return ieee80211_select_queue_80211(sdata, skb, hdr);
750 }
751
752 static const struct net_device_ops ieee80211_monitorif_ops = {
753 .ndo_open = ieee80211_open,
754 .ndo_stop = ieee80211_stop,
755 .ndo_uninit = ieee80211_uninit,
756 .ndo_start_xmit = ieee80211_monitor_start_xmit,
757 .ndo_set_rx_mode = ieee80211_set_multicast_list,
758 .ndo_set_mac_address = ieee80211_change_mac,
759 .ndo_select_queue = ieee80211_monitor_select_queue,
760 .ndo_get_stats64 = ieee80211_get_stats64,
761 };
762
763 static const struct net_device_ops ieee80211_dataif_8023_ops = {
764 .ndo_open = ieee80211_open,
765 .ndo_stop = ieee80211_stop,
766 .ndo_uninit = ieee80211_uninit,
767 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
768 .ndo_set_rx_mode = ieee80211_set_multicast_list,
769 .ndo_set_mac_address = ieee80211_change_mac,
770 .ndo_select_queue = ieee80211_netdev_select_queue,
771 .ndo_get_stats64 = ieee80211_get_stats64,
772 };
773
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)774 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
775 {
776 switch (iftype) {
777 /* P2P GO and client are mapped to AP/STATION types */
778 case NL80211_IFTYPE_AP:
779 case NL80211_IFTYPE_STATION:
780 return true;
781 default:
782 return false;
783 }
784 }
785
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)786 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
787 {
788 struct ieee80211_local *local = sdata->local;
789 u32 flags;
790
791 flags = sdata->vif.offload_flags;
792
793 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
794 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
795 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
796
797 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
798 local->hw.wiphy->frag_threshold != (u32)-1)
799 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
800
801 if (local->monitors)
802 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
803 } else {
804 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
805 }
806
807 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
808 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
809 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
810
811 if (local->monitors &&
812 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
813 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
814 } else {
815 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
816 }
817
818 if (sdata->vif.offload_flags == flags)
819 return false;
820
821 sdata->vif.offload_flags = flags;
822 ieee80211_check_fast_rx_iface(sdata);
823 return true;
824 }
825
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)826 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
827 {
828 struct ieee80211_local *local = sdata->local;
829 struct ieee80211_sub_if_data *bss = sdata;
830 bool enabled;
831
832 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
833 if (!sdata->bss)
834 return;
835
836 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
837 }
838
839 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
840 !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
841 return;
842
843 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
844 if (sdata->wdev.use_4addr &&
845 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
846 enabled = false;
847
848 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
849 &ieee80211_dataif_ops;
850 }
851
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)852 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
853 {
854 struct ieee80211_local *local = sdata->local;
855 struct ieee80211_sub_if_data *vsdata;
856
857 if (ieee80211_set_sdata_offload_flags(sdata)) {
858 drv_update_vif_offload(local, sdata);
859 ieee80211_set_vif_encap_ops(sdata);
860 }
861
862 list_for_each_entry(vsdata, &local->interfaces, list) {
863 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
864 vsdata->bss != &sdata->u.ap)
865 continue;
866
867 ieee80211_set_vif_encap_ops(vsdata);
868 }
869 }
870
ieee80211_recalc_offload(struct ieee80211_local * local)871 void ieee80211_recalc_offload(struct ieee80211_local *local)
872 {
873 struct ieee80211_sub_if_data *sdata;
874
875 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
876 return;
877
878 mutex_lock(&local->iflist_mtx);
879
880 list_for_each_entry(sdata, &local->interfaces, list) {
881 if (!ieee80211_sdata_running(sdata))
882 continue;
883
884 ieee80211_recalc_sdata_offload(sdata);
885 }
886
887 mutex_unlock(&local->iflist_mtx);
888 }
889
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)890 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
891 const int offset)
892 {
893 struct ieee80211_local *local = sdata->local;
894 u32 flags = sdata->u.mntr.flags;
895
896 #define ADJUST(_f, _s) do { \
897 if (flags & MONITOR_FLAG_##_f) \
898 local->fif_##_s += offset; \
899 } while (0)
900
901 ADJUST(FCSFAIL, fcsfail);
902 ADJUST(PLCPFAIL, plcpfail);
903 ADJUST(CONTROL, control);
904 ADJUST(CONTROL, pspoll);
905 ADJUST(OTHER_BSS, other_bss);
906
907 #undef ADJUST
908 }
909
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)910 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
911 {
912 struct ieee80211_local *local = sdata->local;
913 int i;
914
915 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
916 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
917 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
918 else if (local->hw.queues >= IEEE80211_NUM_ACS)
919 sdata->vif.hw_queue[i] = i;
920 else
921 sdata->vif.hw_queue[i] = 0;
922 }
923 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
924 }
925
ieee80211_add_virtual_monitor(struct ieee80211_local * local)926 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
927 {
928 struct ieee80211_sub_if_data *sdata;
929 int ret;
930
931 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
932 return 0;
933
934 ASSERT_RTNL();
935
936 if (local->monitor_sdata)
937 return 0;
938
939 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
940 if (!sdata)
941 return -ENOMEM;
942
943 /* set up data */
944 sdata->local = local;
945 sdata->vif.type = NL80211_IFTYPE_MONITOR;
946 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
947 wiphy_name(local->hw.wiphy));
948 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
949
950 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
951
952 ieee80211_set_default_queues(sdata);
953
954 ret = drv_add_interface(local, sdata);
955 if (WARN_ON(ret)) {
956 /* ok .. stupid driver, it asked for this! */
957 kfree(sdata);
958 return ret;
959 }
960
961 set_bit(SDATA_STATE_RUNNING, &sdata->state);
962
963 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
964 if (ret) {
965 kfree(sdata);
966 return ret;
967 }
968
969 mutex_lock(&local->iflist_mtx);
970 rcu_assign_pointer(local->monitor_sdata, sdata);
971 mutex_unlock(&local->iflist_mtx);
972
973 mutex_lock(&local->mtx);
974 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
975 IEEE80211_CHANCTX_EXCLUSIVE);
976 mutex_unlock(&local->mtx);
977 if (ret) {
978 mutex_lock(&local->iflist_mtx);
979 RCU_INIT_POINTER(local->monitor_sdata, NULL);
980 mutex_unlock(&local->iflist_mtx);
981 synchronize_net();
982 drv_remove_interface(local, sdata);
983 kfree(sdata);
984 return ret;
985 }
986
987 skb_queue_head_init(&sdata->skb_queue);
988 INIT_WORK(&sdata->work, ieee80211_iface_work);
989
990 return 0;
991 }
992
ieee80211_del_virtual_monitor(struct ieee80211_local * local)993 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
994 {
995 struct ieee80211_sub_if_data *sdata;
996
997 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
998 return;
999
1000 ASSERT_RTNL();
1001
1002 mutex_lock(&local->iflist_mtx);
1003
1004 sdata = rcu_dereference_protected(local->monitor_sdata,
1005 lockdep_is_held(&local->iflist_mtx));
1006 if (!sdata) {
1007 mutex_unlock(&local->iflist_mtx);
1008 return;
1009 }
1010
1011 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1012 mutex_unlock(&local->iflist_mtx);
1013
1014 synchronize_net();
1015
1016 mutex_lock(&local->mtx);
1017 ieee80211_vif_release_channel(sdata);
1018 mutex_unlock(&local->mtx);
1019
1020 drv_remove_interface(local, sdata);
1021
1022 kfree(sdata);
1023 }
1024
1025 /*
1026 * NOTE: Be very careful when changing this function, it must NOT return
1027 * an error on interface type changes that have been pre-checked, so most
1028 * checks should be in ieee80211_check_concurrent_iface.
1029 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1030 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1031 {
1032 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1033 struct net_device *dev = wdev->netdev;
1034 struct ieee80211_local *local = sdata->local;
1035 u32 changed = 0;
1036 int res;
1037 u32 hw_reconf_flags = 0;
1038
1039 switch (sdata->vif.type) {
1040 case NL80211_IFTYPE_AP_VLAN: {
1041 struct ieee80211_sub_if_data *master;
1042
1043 if (!sdata->bss)
1044 return -ENOLINK;
1045
1046 mutex_lock(&local->mtx);
1047 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1048 mutex_unlock(&local->mtx);
1049
1050 master = container_of(sdata->bss,
1051 struct ieee80211_sub_if_data, u.ap);
1052 sdata->control_port_protocol =
1053 master->control_port_protocol;
1054 sdata->control_port_no_encrypt =
1055 master->control_port_no_encrypt;
1056 sdata->control_port_over_nl80211 =
1057 master->control_port_over_nl80211;
1058 sdata->control_port_no_preauth =
1059 master->control_port_no_preauth;
1060 sdata->vif.cab_queue = master->vif.cab_queue;
1061 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1062 sizeof(sdata->vif.hw_queue));
1063 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1064
1065 mutex_lock(&local->key_mtx);
1066 sdata->crypto_tx_tailroom_needed_cnt +=
1067 master->crypto_tx_tailroom_needed_cnt;
1068 mutex_unlock(&local->key_mtx);
1069
1070 break;
1071 }
1072 case NL80211_IFTYPE_AP:
1073 sdata->bss = &sdata->u.ap;
1074 break;
1075 case NL80211_IFTYPE_MESH_POINT:
1076 case NL80211_IFTYPE_STATION:
1077 case NL80211_IFTYPE_MONITOR:
1078 case NL80211_IFTYPE_ADHOC:
1079 case NL80211_IFTYPE_P2P_DEVICE:
1080 case NL80211_IFTYPE_OCB:
1081 case NL80211_IFTYPE_NAN:
1082 /* no special treatment */
1083 break;
1084 case NL80211_IFTYPE_UNSPECIFIED:
1085 case NUM_NL80211_IFTYPES:
1086 case NL80211_IFTYPE_P2P_CLIENT:
1087 case NL80211_IFTYPE_P2P_GO:
1088 case NL80211_IFTYPE_WDS:
1089 /* cannot happen */
1090 WARN_ON(1);
1091 break;
1092 }
1093
1094 if (local->open_count == 0) {
1095 res = drv_start(local);
1096 if (res)
1097 goto err_del_bss;
1098 /* we're brought up, everything changes */
1099 hw_reconf_flags = ~0;
1100 ieee80211_led_radio(local, true);
1101 ieee80211_mod_tpt_led_trig(local,
1102 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1103 }
1104
1105 /*
1106 * Copy the hopefully now-present MAC address to
1107 * this interface, if it has the special null one.
1108 */
1109 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1110 memcpy(dev->dev_addr,
1111 local->hw.wiphy->perm_addr,
1112 ETH_ALEN);
1113 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1114
1115 if (!is_valid_ether_addr(dev->dev_addr)) {
1116 res = -EADDRNOTAVAIL;
1117 goto err_stop;
1118 }
1119 }
1120
1121 switch (sdata->vif.type) {
1122 case NL80211_IFTYPE_AP_VLAN:
1123 /* no need to tell driver, but set carrier and chanctx */
1124 if (rtnl_dereference(sdata->bss->beacon)) {
1125 ieee80211_vif_vlan_copy_chanctx(sdata);
1126 netif_carrier_on(dev);
1127 ieee80211_set_vif_encap_ops(sdata);
1128 } else {
1129 netif_carrier_off(dev);
1130 }
1131 break;
1132 case NL80211_IFTYPE_MONITOR:
1133 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1134 local->cooked_mntrs++;
1135 break;
1136 }
1137
1138 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1139 res = drv_add_interface(local, sdata);
1140 if (res)
1141 goto err_stop;
1142 } else if (local->monitors == 0 && local->open_count == 0) {
1143 res = ieee80211_add_virtual_monitor(local);
1144 if (res)
1145 goto err_stop;
1146 }
1147
1148 /* must be before the call to ieee80211_configure_filter */
1149 local->monitors++;
1150 if (local->monitors == 1) {
1151 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1152 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1153 }
1154
1155 ieee80211_adjust_monitor_flags(sdata, 1);
1156 ieee80211_configure_filter(local);
1157 ieee80211_recalc_offload(local);
1158 mutex_lock(&local->mtx);
1159 ieee80211_recalc_idle(local);
1160 mutex_unlock(&local->mtx);
1161
1162 netif_carrier_on(dev);
1163 break;
1164 default:
1165 if (coming_up) {
1166 ieee80211_del_virtual_monitor(local);
1167 ieee80211_set_sdata_offload_flags(sdata);
1168
1169 res = drv_add_interface(local, sdata);
1170 if (res)
1171 goto err_stop;
1172
1173 ieee80211_set_vif_encap_ops(sdata);
1174 res = ieee80211_check_queues(sdata,
1175 ieee80211_vif_type_p2p(&sdata->vif));
1176 if (res)
1177 goto err_del_interface;
1178 }
1179
1180 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1181 local->fif_pspoll++;
1182 local->fif_probe_req++;
1183
1184 ieee80211_configure_filter(local);
1185 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1186 local->fif_probe_req++;
1187 }
1188
1189 if (sdata->vif.probe_req_reg)
1190 drv_config_iface_filter(local, sdata,
1191 FIF_PROBE_REQ,
1192 FIF_PROBE_REQ);
1193
1194 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1195 sdata->vif.type != NL80211_IFTYPE_NAN)
1196 changed |= ieee80211_reset_erp_info(sdata);
1197 ieee80211_bss_info_change_notify(sdata, changed);
1198
1199 switch (sdata->vif.type) {
1200 case NL80211_IFTYPE_STATION:
1201 case NL80211_IFTYPE_ADHOC:
1202 case NL80211_IFTYPE_AP:
1203 case NL80211_IFTYPE_MESH_POINT:
1204 case NL80211_IFTYPE_OCB:
1205 netif_carrier_off(dev);
1206 break;
1207 case NL80211_IFTYPE_P2P_DEVICE:
1208 case NL80211_IFTYPE_NAN:
1209 break;
1210 default:
1211 /* not reached */
1212 WARN_ON(1);
1213 }
1214
1215 /*
1216 * Set default queue parameters so drivers don't
1217 * need to initialise the hardware if the hardware
1218 * doesn't start up with sane defaults.
1219 * Enable QoS for anything but station interfaces.
1220 */
1221 ieee80211_set_wmm_default(sdata, true,
1222 sdata->vif.type != NL80211_IFTYPE_STATION);
1223 }
1224
1225 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1226
1227 switch (sdata->vif.type) {
1228 case NL80211_IFTYPE_P2P_DEVICE:
1229 rcu_assign_pointer(local->p2p_sdata, sdata);
1230 break;
1231 case NL80211_IFTYPE_MONITOR:
1232 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1233 break;
1234 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1235 break;
1236 default:
1237 break;
1238 }
1239
1240 /*
1241 * set_multicast_list will be invoked by the networking core
1242 * which will check whether any increments here were done in
1243 * error and sync them down to the hardware as filter flags.
1244 */
1245 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1246 atomic_inc(&local->iff_allmultis);
1247
1248 if (coming_up)
1249 local->open_count++;
1250
1251 if (hw_reconf_flags)
1252 ieee80211_hw_config(local, hw_reconf_flags);
1253
1254 ieee80211_recalc_ps(local);
1255
1256 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1257 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1258 local->ops->wake_tx_queue) {
1259 /* XXX: for AP_VLAN, actually track AP queues */
1260 if (dev)
1261 netif_tx_start_all_queues(dev);
1262 } else if (dev) {
1263 unsigned long flags;
1264 int n_acs = IEEE80211_NUM_ACS;
1265 int ac;
1266
1267 if (local->hw.queues < IEEE80211_NUM_ACS)
1268 n_acs = 1;
1269
1270 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1271 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1272 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1273 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1274 for (ac = 0; ac < n_acs; ac++) {
1275 int ac_queue = sdata->vif.hw_queue[ac];
1276
1277 if (local->queue_stop_reasons[ac_queue] == 0 &&
1278 skb_queue_empty(&local->pending[ac_queue]))
1279 netif_start_subqueue(dev, ac);
1280 }
1281 }
1282 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1283 }
1284
1285 return 0;
1286 err_del_interface:
1287 drv_remove_interface(local, sdata);
1288 err_stop:
1289 if (!local->open_count)
1290 drv_stop(local);
1291 err_del_bss:
1292 sdata->bss = NULL;
1293 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1294 mutex_lock(&local->mtx);
1295 list_del(&sdata->u.vlan.list);
1296 mutex_unlock(&local->mtx);
1297 }
1298 /* might already be clear but that doesn't matter */
1299 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1300 return res;
1301 }
1302
ieee80211_if_free(struct net_device * dev)1303 static void ieee80211_if_free(struct net_device *dev)
1304 {
1305 free_percpu(dev->tstats);
1306 }
1307
ieee80211_if_setup(struct net_device * dev)1308 static void ieee80211_if_setup(struct net_device *dev)
1309 {
1310 ether_setup(dev);
1311 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1312 dev->netdev_ops = &ieee80211_dataif_ops;
1313 dev->needs_free_netdev = true;
1314 dev->priv_destructor = ieee80211_if_free;
1315 }
1316
ieee80211_if_setup_no_queue(struct net_device * dev)1317 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1318 {
1319 ieee80211_if_setup(dev);
1320 dev->priv_flags |= IFF_NO_QUEUE;
1321 }
1322
ieee80211_iface_work(struct work_struct * work)1323 static void ieee80211_iface_work(struct work_struct *work)
1324 {
1325 struct ieee80211_sub_if_data *sdata =
1326 container_of(work, struct ieee80211_sub_if_data, work);
1327 struct ieee80211_local *local = sdata->local;
1328 struct sk_buff *skb;
1329 struct sta_info *sta;
1330
1331 if (!ieee80211_sdata_running(sdata))
1332 return;
1333
1334 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1335 return;
1336
1337 if (!ieee80211_can_run_worker(local))
1338 return;
1339
1340 /* first process frames */
1341 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1342 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1343
1344 kcov_remote_start_common(skb_get_kcov_handle(skb));
1345 if (ieee80211_is_action(mgmt->frame_control) &&
1346 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1347 int len = skb->len;
1348
1349 mutex_lock(&local->sta_mtx);
1350 sta = sta_info_get_bss(sdata, mgmt->sa);
1351 if (sta) {
1352 switch (mgmt->u.action.u.addba_req.action_code) {
1353 case WLAN_ACTION_ADDBA_REQ:
1354 ieee80211_process_addba_request(
1355 local, sta, mgmt, len);
1356 break;
1357 case WLAN_ACTION_ADDBA_RESP:
1358 ieee80211_process_addba_resp(local, sta,
1359 mgmt, len);
1360 break;
1361 case WLAN_ACTION_DELBA:
1362 ieee80211_process_delba(sdata, sta,
1363 mgmt, len);
1364 break;
1365 default:
1366 WARN_ON(1);
1367 break;
1368 }
1369 }
1370 mutex_unlock(&local->sta_mtx);
1371 } else if (ieee80211_is_action(mgmt->frame_control) &&
1372 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1373 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1374 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1375 struct ieee80211_rx_status *status;
1376 enum nl80211_band band;
1377 u8 opmode;
1378
1379 status = IEEE80211_SKB_RXCB(skb);
1380 band = status->band;
1381 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1382
1383 mutex_lock(&local->sta_mtx);
1384 sta = sta_info_get_bss(sdata, mgmt->sa);
1385
1386 if (sta)
1387 ieee80211_vht_handle_opmode(sdata, sta,
1388 opmode,
1389 band);
1390
1391 mutex_unlock(&local->sta_mtx);
1392 break;
1393 }
1394 case WLAN_VHT_ACTION_GROUPID_MGMT:
1395 ieee80211_process_mu_groups(sdata, mgmt);
1396 break;
1397 default:
1398 WARN_ON(1);
1399 break;
1400 }
1401 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1402 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1403 ieee80211_sta_rx_queued_ext(sdata, skb);
1404 else
1405 WARN_ON(1);
1406 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1407 struct ieee80211_hdr *hdr = (void *)mgmt;
1408 /*
1409 * So the frame isn't mgmt, but frame_control
1410 * is at the right place anyway, of course, so
1411 * the if statement is correct.
1412 *
1413 * Warn if we have other data frame types here,
1414 * they must not get here.
1415 */
1416 WARN_ON(hdr->frame_control &
1417 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1418 WARN_ON(!(hdr->seq_ctrl &
1419 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1420 /*
1421 * This was a fragment of a frame, received while
1422 * a block-ack session was active. That cannot be
1423 * right, so terminate the session.
1424 */
1425 mutex_lock(&local->sta_mtx);
1426 sta = sta_info_get_bss(sdata, mgmt->sa);
1427 if (sta) {
1428 u16 tid = ieee80211_get_tid(hdr);
1429
1430 __ieee80211_stop_rx_ba_session(
1431 sta, tid, WLAN_BACK_RECIPIENT,
1432 WLAN_REASON_QSTA_REQUIRE_SETUP,
1433 true);
1434 }
1435 mutex_unlock(&local->sta_mtx);
1436 } else switch (sdata->vif.type) {
1437 case NL80211_IFTYPE_STATION:
1438 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1439 break;
1440 case NL80211_IFTYPE_ADHOC:
1441 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1442 break;
1443 case NL80211_IFTYPE_MESH_POINT:
1444 if (!ieee80211_vif_is_mesh(&sdata->vif))
1445 break;
1446 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1447 break;
1448 default:
1449 WARN(1, "frame for unexpected interface type");
1450 break;
1451 }
1452
1453 kfree_skb(skb);
1454 kcov_remote_stop();
1455 }
1456
1457 /* then other type-dependent work */
1458 switch (sdata->vif.type) {
1459 case NL80211_IFTYPE_STATION:
1460 ieee80211_sta_work(sdata);
1461 break;
1462 case NL80211_IFTYPE_ADHOC:
1463 ieee80211_ibss_work(sdata);
1464 break;
1465 case NL80211_IFTYPE_MESH_POINT:
1466 if (!ieee80211_vif_is_mesh(&sdata->vif))
1467 break;
1468 ieee80211_mesh_work(sdata);
1469 break;
1470 case NL80211_IFTYPE_OCB:
1471 ieee80211_ocb_work(sdata);
1472 break;
1473 default:
1474 break;
1475 }
1476 }
1477
ieee80211_recalc_smps_work(struct work_struct * work)1478 static void ieee80211_recalc_smps_work(struct work_struct *work)
1479 {
1480 struct ieee80211_sub_if_data *sdata =
1481 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1482
1483 ieee80211_recalc_smps(sdata);
1484 }
1485
1486 /*
1487 * Helper function to initialise an interface to a specific type.
1488 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1489 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1490 enum nl80211_iftype type)
1491 {
1492 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1493 0xff, 0xff, 0xff};
1494
1495 /* clear type-dependent union */
1496 memset(&sdata->u, 0, sizeof(sdata->u));
1497
1498 /* and set some type-dependent values */
1499 sdata->vif.type = type;
1500 sdata->vif.p2p = false;
1501 sdata->wdev.iftype = type;
1502
1503 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1504 sdata->control_port_no_encrypt = false;
1505 sdata->control_port_over_nl80211 = false;
1506 sdata->control_port_no_preauth = false;
1507 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1508 sdata->vif.bss_conf.idle = true;
1509 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1510
1511 sdata->noack_map = 0;
1512
1513 /* only monitor/p2p-device differ */
1514 if (sdata->dev) {
1515 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1516 sdata->dev->type = ARPHRD_ETHER;
1517 }
1518
1519 skb_queue_head_init(&sdata->skb_queue);
1520 INIT_WORK(&sdata->work, ieee80211_iface_work);
1521 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1522 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1523 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1524 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1525
1526 switch (type) {
1527 case NL80211_IFTYPE_P2P_GO:
1528 type = NL80211_IFTYPE_AP;
1529 sdata->vif.type = type;
1530 sdata->vif.p2p = true;
1531 fallthrough;
1532 case NL80211_IFTYPE_AP:
1533 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1534 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1535 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1536 break;
1537 case NL80211_IFTYPE_P2P_CLIENT:
1538 type = NL80211_IFTYPE_STATION;
1539 sdata->vif.type = type;
1540 sdata->vif.p2p = true;
1541 fallthrough;
1542 case NL80211_IFTYPE_STATION:
1543 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1544 ieee80211_sta_setup_sdata(sdata);
1545 break;
1546 case NL80211_IFTYPE_OCB:
1547 sdata->vif.bss_conf.bssid = bssid_wildcard;
1548 ieee80211_ocb_setup_sdata(sdata);
1549 break;
1550 case NL80211_IFTYPE_ADHOC:
1551 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1552 ieee80211_ibss_setup_sdata(sdata);
1553 break;
1554 case NL80211_IFTYPE_MESH_POINT:
1555 if (ieee80211_vif_is_mesh(&sdata->vif))
1556 ieee80211_mesh_init_sdata(sdata);
1557 break;
1558 case NL80211_IFTYPE_MONITOR:
1559 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1560 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1561 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1562 MONITOR_FLAG_OTHER_BSS;
1563 break;
1564 case NL80211_IFTYPE_NAN:
1565 idr_init(&sdata->u.nan.function_inst_ids);
1566 spin_lock_init(&sdata->u.nan.func_lock);
1567 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1568 break;
1569 case NL80211_IFTYPE_AP_VLAN:
1570 case NL80211_IFTYPE_P2P_DEVICE:
1571 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1572 break;
1573 case NL80211_IFTYPE_UNSPECIFIED:
1574 case NL80211_IFTYPE_WDS:
1575 case NUM_NL80211_IFTYPES:
1576 WARN_ON(1);
1577 break;
1578 }
1579
1580 ieee80211_debugfs_add_netdev(sdata);
1581 }
1582
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1583 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1584 enum nl80211_iftype type)
1585 {
1586 struct ieee80211_local *local = sdata->local;
1587 int ret, err;
1588 enum nl80211_iftype internal_type = type;
1589 bool p2p = false;
1590
1591 ASSERT_RTNL();
1592
1593 if (!local->ops->change_interface)
1594 return -EBUSY;
1595
1596 switch (sdata->vif.type) {
1597 case NL80211_IFTYPE_AP:
1598 case NL80211_IFTYPE_STATION:
1599 case NL80211_IFTYPE_ADHOC:
1600 case NL80211_IFTYPE_OCB:
1601 /*
1602 * Could maybe also all others here?
1603 * Just not sure how that interacts
1604 * with the RX/config path e.g. for
1605 * mesh.
1606 */
1607 break;
1608 default:
1609 return -EBUSY;
1610 }
1611
1612 switch (type) {
1613 case NL80211_IFTYPE_AP:
1614 case NL80211_IFTYPE_STATION:
1615 case NL80211_IFTYPE_ADHOC:
1616 case NL80211_IFTYPE_OCB:
1617 /*
1618 * Could probably support everything
1619 * but here.
1620 */
1621 break;
1622 case NL80211_IFTYPE_P2P_CLIENT:
1623 p2p = true;
1624 internal_type = NL80211_IFTYPE_STATION;
1625 break;
1626 case NL80211_IFTYPE_P2P_GO:
1627 p2p = true;
1628 internal_type = NL80211_IFTYPE_AP;
1629 break;
1630 default:
1631 return -EBUSY;
1632 }
1633
1634 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1635 if (ret)
1636 return ret;
1637
1638 ieee80211_stop_vif_queues(local, sdata,
1639 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1640 synchronize_net();
1641
1642 ieee80211_do_stop(sdata, false);
1643
1644 ieee80211_teardown_sdata(sdata);
1645
1646 ieee80211_set_sdata_offload_flags(sdata);
1647 ret = drv_change_interface(local, sdata, internal_type, p2p);
1648 if (ret)
1649 type = ieee80211_vif_type_p2p(&sdata->vif);
1650
1651 /*
1652 * Ignore return value here, there's not much we can do since
1653 * the driver changed the interface type internally already.
1654 * The warnings will hopefully make driver authors fix it :-)
1655 */
1656 ieee80211_check_queues(sdata, type);
1657
1658 ieee80211_setup_sdata(sdata, type);
1659 ieee80211_set_vif_encap_ops(sdata);
1660
1661 err = ieee80211_do_open(&sdata->wdev, false);
1662 WARN(err, "type change: do_open returned %d", err);
1663
1664 ieee80211_wake_vif_queues(local, sdata,
1665 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1666 return ret;
1667 }
1668
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1669 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1670 enum nl80211_iftype type)
1671 {
1672 int ret;
1673
1674 ASSERT_RTNL();
1675
1676 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1677 return 0;
1678
1679 if (ieee80211_sdata_running(sdata)) {
1680 ret = ieee80211_runtime_change_iftype(sdata, type);
1681 if (ret)
1682 return ret;
1683 } else {
1684 /* Purge and reset type-dependent state. */
1685 ieee80211_teardown_sdata(sdata);
1686 ieee80211_setup_sdata(sdata, type);
1687 }
1688
1689 /* reset some values that shouldn't be kept across type changes */
1690 if (type == NL80211_IFTYPE_STATION)
1691 sdata->u.mgd.use_4addr = false;
1692
1693 return 0;
1694 }
1695
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1696 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1697 u8 *perm_addr, enum nl80211_iftype type)
1698 {
1699 struct ieee80211_sub_if_data *sdata;
1700 u64 mask, start, addr, val, inc;
1701 u8 *m;
1702 u8 tmp_addr[ETH_ALEN];
1703 int i;
1704
1705 /* default ... something at least */
1706 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1707
1708 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1709 local->hw.wiphy->n_addresses <= 1)
1710 return;
1711
1712 mutex_lock(&local->iflist_mtx);
1713
1714 switch (type) {
1715 case NL80211_IFTYPE_MONITOR:
1716 /* doesn't matter */
1717 break;
1718 case NL80211_IFTYPE_AP_VLAN:
1719 /* match up with an AP interface */
1720 list_for_each_entry(sdata, &local->interfaces, list) {
1721 if (sdata->vif.type != NL80211_IFTYPE_AP)
1722 continue;
1723 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1724 break;
1725 }
1726 /* keep default if no AP interface present */
1727 break;
1728 case NL80211_IFTYPE_P2P_CLIENT:
1729 case NL80211_IFTYPE_P2P_GO:
1730 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1731 list_for_each_entry(sdata, &local->interfaces, list) {
1732 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1733 continue;
1734 if (!ieee80211_sdata_running(sdata))
1735 continue;
1736 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1737 goto out_unlock;
1738 }
1739 }
1740 fallthrough;
1741 default:
1742 /* assign a new address if possible -- try n_addresses first */
1743 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1744 bool used = false;
1745
1746 list_for_each_entry(sdata, &local->interfaces, list) {
1747 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1748 sdata->vif.addr)) {
1749 used = true;
1750 break;
1751 }
1752 }
1753
1754 if (!used) {
1755 memcpy(perm_addr,
1756 local->hw.wiphy->addresses[i].addr,
1757 ETH_ALEN);
1758 break;
1759 }
1760 }
1761
1762 /* try mask if available */
1763 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1764 break;
1765
1766 m = local->hw.wiphy->addr_mask;
1767 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1768 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1769 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1770
1771 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1772 /* not a contiguous mask ... not handled now! */
1773 pr_info("not contiguous\n");
1774 break;
1775 }
1776
1777 /*
1778 * Pick address of existing interface in case user changed
1779 * MAC address manually, default to perm_addr.
1780 */
1781 m = local->hw.wiphy->perm_addr;
1782 list_for_each_entry(sdata, &local->interfaces, list) {
1783 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1784 continue;
1785 m = sdata->vif.addr;
1786 break;
1787 }
1788 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1789 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1790 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1791
1792 inc = 1ULL<<__ffs64(mask);
1793 val = (start & mask);
1794 addr = (start & ~mask) | (val & mask);
1795 do {
1796 bool used = false;
1797
1798 tmp_addr[5] = addr >> 0*8;
1799 tmp_addr[4] = addr >> 1*8;
1800 tmp_addr[3] = addr >> 2*8;
1801 tmp_addr[2] = addr >> 3*8;
1802 tmp_addr[1] = addr >> 4*8;
1803 tmp_addr[0] = addr >> 5*8;
1804
1805 val += inc;
1806
1807 list_for_each_entry(sdata, &local->interfaces, list) {
1808 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1809 used = true;
1810 break;
1811 }
1812 }
1813
1814 if (!used) {
1815 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1816 break;
1817 }
1818 addr = (start & ~mask) | (val & mask);
1819 } while (addr != start);
1820
1821 break;
1822 }
1823
1824 out_unlock:
1825 mutex_unlock(&local->iflist_mtx);
1826 }
1827
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)1828 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1829 unsigned char name_assign_type,
1830 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1831 struct vif_params *params)
1832 {
1833 struct net_device *ndev = NULL;
1834 struct ieee80211_sub_if_data *sdata = NULL;
1835 struct txq_info *txqi;
1836 void (*if_setup)(struct net_device *dev);
1837 int ret, i;
1838 int txqs = 1;
1839
1840 ASSERT_RTNL();
1841
1842 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1843 struct wireless_dev *wdev;
1844
1845 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1846 GFP_KERNEL);
1847 if (!sdata)
1848 return -ENOMEM;
1849 wdev = &sdata->wdev;
1850
1851 sdata->dev = NULL;
1852 strlcpy(sdata->name, name, IFNAMSIZ);
1853 ieee80211_assign_perm_addr(local, wdev->address, type);
1854 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1855 } else {
1856 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1857 sizeof(void *));
1858 int txq_size = 0;
1859
1860 if (local->ops->wake_tx_queue &&
1861 type != NL80211_IFTYPE_AP_VLAN &&
1862 (type != NL80211_IFTYPE_MONITOR ||
1863 (params->flags & MONITOR_FLAG_ACTIVE)))
1864 txq_size += sizeof(struct txq_info) +
1865 local->hw.txq_data_size;
1866
1867 if (local->ops->wake_tx_queue) {
1868 if_setup = ieee80211_if_setup_no_queue;
1869 } else {
1870 if_setup = ieee80211_if_setup;
1871 if (local->hw.queues >= IEEE80211_NUM_ACS)
1872 txqs = IEEE80211_NUM_ACS;
1873 }
1874
1875 ndev = alloc_netdev_mqs(size + txq_size,
1876 name, name_assign_type,
1877 if_setup, txqs, 1);
1878 if (!ndev)
1879 return -ENOMEM;
1880
1881 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1882 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1883
1884 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1885
1886 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1887 if (!ndev->tstats) {
1888 free_netdev(ndev);
1889 return -ENOMEM;
1890 }
1891
1892 ndev->needed_headroom = local->tx_headroom +
1893 4*6 /* four MAC addresses */
1894 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1895 + 6 /* mesh */
1896 + 8 /* rfc1042/bridge tunnel */
1897 - ETH_HLEN /* ethernet hard_header_len */
1898 + IEEE80211_ENCRYPT_HEADROOM;
1899 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1900
1901 ret = dev_alloc_name(ndev, ndev->name);
1902 if (ret < 0) {
1903 ieee80211_if_free(ndev);
1904 free_netdev(ndev);
1905 return ret;
1906 }
1907
1908 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1909 if (is_valid_ether_addr(params->macaddr))
1910 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1911 else
1912 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1913 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1914
1915 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1916 sdata = netdev_priv(ndev);
1917 ndev->ieee80211_ptr = &sdata->wdev;
1918 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1919 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1920
1921 if (txq_size) {
1922 txqi = netdev_priv(ndev) + size;
1923 ieee80211_txq_init(sdata, NULL, txqi, 0);
1924 }
1925
1926 sdata->dev = ndev;
1927 }
1928
1929 /* initialise type-independent data */
1930 sdata->wdev.wiphy = local->hw.wiphy;
1931 sdata->local = local;
1932
1933 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1934 skb_queue_head_init(&sdata->fragments[i].skb_list);
1935
1936 INIT_LIST_HEAD(&sdata->key_list);
1937
1938 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1939 ieee80211_dfs_cac_timer_work);
1940 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1941 ieee80211_delayed_tailroom_dec);
1942
1943 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1944 struct ieee80211_supported_band *sband;
1945 sband = local->hw.wiphy->bands[i];
1946 sdata->rc_rateidx_mask[i] =
1947 sband ? (1 << sband->n_bitrates) - 1 : 0;
1948 if (sband) {
1949 __le16 cap;
1950 u16 *vht_rate_mask;
1951
1952 memcpy(sdata->rc_rateidx_mcs_mask[i],
1953 sband->ht_cap.mcs.rx_mask,
1954 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1955
1956 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1957 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1958 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1959 } else {
1960 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1961 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1962 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1963 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1964 }
1965 }
1966
1967 ieee80211_set_default_queues(sdata);
1968
1969 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1970 sdata->user_power_level = local->user_power_level;
1971
1972 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1973
1974 /* setup type-dependent data */
1975 ieee80211_setup_sdata(sdata, type);
1976
1977 if (ndev) {
1978 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1979 if (type == NL80211_IFTYPE_STATION)
1980 sdata->u.mgd.use_4addr = params->use_4addr;
1981
1982 ndev->features |= local->hw.netdev_features;
1983 ndev->hw_features |= ndev->features &
1984 MAC80211_SUPPORTED_FEATURES_TX;
1985
1986 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1987
1988 /* MTU range: 256 - 2304 */
1989 ndev->min_mtu = 256;
1990 ndev->max_mtu = local->hw.max_mtu;
1991
1992 ret = cfg80211_register_netdevice(ndev);
1993 if (ret) {
1994 free_netdev(ndev);
1995 return ret;
1996 }
1997 }
1998
1999 mutex_lock(&local->iflist_mtx);
2000 list_add_tail_rcu(&sdata->list, &local->interfaces);
2001 mutex_unlock(&local->iflist_mtx);
2002
2003 if (new_wdev)
2004 *new_wdev = &sdata->wdev;
2005
2006 return 0;
2007 }
2008
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2009 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2010 {
2011 ASSERT_RTNL();
2012
2013 mutex_lock(&sdata->local->iflist_mtx);
2014 list_del_rcu(&sdata->list);
2015 mutex_unlock(&sdata->local->iflist_mtx);
2016
2017 if (sdata->vif.txq)
2018 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2019
2020 synchronize_rcu();
2021
2022 cfg80211_unregister_wdev(&sdata->wdev);
2023
2024 if (!sdata->dev) {
2025 ieee80211_teardown_sdata(sdata);
2026 kfree(sdata);
2027 }
2028 }
2029
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2030 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2031 {
2032 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2033 return;
2034 ieee80211_do_stop(sdata, true);
2035 }
2036
ieee80211_remove_interfaces(struct ieee80211_local * local)2037 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2038 {
2039 struct ieee80211_sub_if_data *sdata, *tmp;
2040 LIST_HEAD(unreg_list);
2041 LIST_HEAD(wdev_list);
2042
2043 ASSERT_RTNL();
2044
2045 /* Before destroying the interfaces, make sure they're all stopped so
2046 * that the hardware is stopped. Otherwise, the driver might still be
2047 * iterating the interfaces during the shutdown, e.g. from a worker
2048 * or from RX processing or similar, and if it does so (using atomic
2049 * iteration) while we're manipulating the list, the iteration will
2050 * crash.
2051 *
2052 * After this, the hardware should be stopped and the driver should
2053 * have stopped all of its activities, so that we can do RCU-unaware
2054 * manipulations of the interface list below.
2055 */
2056 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2057
2058 WARN(local->open_count, "%s: open count remains %d\n",
2059 wiphy_name(local->hw.wiphy), local->open_count);
2060
2061 ieee80211_txq_teardown_flows(local);
2062
2063 mutex_lock(&local->iflist_mtx);
2064 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2065 list_del(&sdata->list);
2066
2067 if (sdata->dev)
2068 unregister_netdevice_queue(sdata->dev, &unreg_list);
2069 else
2070 list_add(&sdata->list, &wdev_list);
2071 }
2072 mutex_unlock(&local->iflist_mtx);
2073
2074 unregister_netdevice_many(&unreg_list);
2075
2076 wiphy_lock(local->hw.wiphy);
2077 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2078 list_del(&sdata->list);
2079 cfg80211_unregister_wdev(&sdata->wdev);
2080 kfree(sdata);
2081 }
2082 wiphy_unlock(local->hw.wiphy);
2083 }
2084
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2085 static int netdev_notify(struct notifier_block *nb,
2086 unsigned long state, void *ptr)
2087 {
2088 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2089 struct ieee80211_sub_if_data *sdata;
2090
2091 if (state != NETDEV_CHANGENAME)
2092 return NOTIFY_DONE;
2093
2094 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2095 return NOTIFY_DONE;
2096
2097 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2098 return NOTIFY_DONE;
2099
2100 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2101 memcpy(sdata->name, dev->name, IFNAMSIZ);
2102 ieee80211_debugfs_rename_netdev(sdata);
2103
2104 return NOTIFY_OK;
2105 }
2106
2107 static struct notifier_block mac80211_netdev_notifier = {
2108 .notifier_call = netdev_notify,
2109 };
2110
ieee80211_iface_init(void)2111 int ieee80211_iface_init(void)
2112 {
2113 return register_netdevice_notifier(&mac80211_netdev_notifier);
2114 }
2115
ieee80211_iface_exit(void)2116 void ieee80211_iface_exit(void)
2117 {
2118 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2119 }
2120
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2121 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2122 {
2123 if (sdata->vif.type == NL80211_IFTYPE_AP)
2124 atomic_inc(&sdata->u.ap.num_mcast_sta);
2125 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2126 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2127 }
2128
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2129 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2130 {
2131 if (sdata->vif.type == NL80211_IFTYPE_AP)
2132 atomic_dec(&sdata->u.ap.num_mcast_sta);
2133 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2134 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2135 }
2136