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_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)351 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
352 const int offset)
353 {
354 struct ieee80211_local *local = sdata->local;
355 u32 flags = sdata->u.mntr.flags;
356
357 #define ADJUST(_f, _s) do { \
358 if (flags & MONITOR_FLAG_##_f) \
359 local->fif_##_s += offset; \
360 } while (0)
361
362 ADJUST(FCSFAIL, fcsfail);
363 ADJUST(PLCPFAIL, plcpfail);
364 ADJUST(CONTROL, control);
365 ADJUST(CONTROL, pspoll);
366 ADJUST(OTHER_BSS, other_bss);
367
368 #undef ADJUST
369 }
370
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)371 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
372 {
373 struct ieee80211_local *local = sdata->local;
374 int i;
375
376 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
377 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
378 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
379 else if (local->hw.queues >= IEEE80211_NUM_ACS)
380 sdata->vif.hw_queue[i] = i;
381 else
382 sdata->vif.hw_queue[i] = 0;
383 }
384 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
385 }
386
ieee80211_add_virtual_monitor(struct ieee80211_local * local)387 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
388 {
389 struct ieee80211_sub_if_data *sdata;
390 int ret;
391
392 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
393 return 0;
394
395 ASSERT_RTNL();
396
397 if (local->monitor_sdata)
398 return 0;
399
400 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
401 if (!sdata)
402 return -ENOMEM;
403
404 /* set up data */
405 sdata->local = local;
406 sdata->vif.type = NL80211_IFTYPE_MONITOR;
407 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
408 wiphy_name(local->hw.wiphy));
409 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
410
411 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
412
413 ieee80211_set_default_queues(sdata);
414
415 ret = drv_add_interface(local, sdata);
416 if (WARN_ON(ret)) {
417 /* ok .. stupid driver, it asked for this! */
418 kfree(sdata);
419 return ret;
420 }
421
422 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
423 if (ret) {
424 kfree(sdata);
425 return ret;
426 }
427
428 mutex_lock(&local->iflist_mtx);
429 rcu_assign_pointer(local->monitor_sdata, sdata);
430 mutex_unlock(&local->iflist_mtx);
431
432 mutex_lock(&local->mtx);
433 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
434 IEEE80211_CHANCTX_EXCLUSIVE);
435 mutex_unlock(&local->mtx);
436 if (ret) {
437 mutex_lock(&local->iflist_mtx);
438 RCU_INIT_POINTER(local->monitor_sdata, NULL);
439 mutex_unlock(&local->iflist_mtx);
440 synchronize_net();
441 drv_remove_interface(local, sdata);
442 kfree(sdata);
443 return ret;
444 }
445
446 skb_queue_head_init(&sdata->skb_queue);
447 INIT_WORK(&sdata->work, ieee80211_iface_work);
448
449 return 0;
450 }
451
ieee80211_del_virtual_monitor(struct ieee80211_local * local)452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
453 {
454 struct ieee80211_sub_if_data *sdata;
455
456 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
457 return;
458
459 ASSERT_RTNL();
460
461 mutex_lock(&local->iflist_mtx);
462
463 sdata = rcu_dereference_protected(local->monitor_sdata,
464 lockdep_is_held(&local->iflist_mtx));
465 if (!sdata) {
466 mutex_unlock(&local->iflist_mtx);
467 return;
468 }
469
470 RCU_INIT_POINTER(local->monitor_sdata, NULL);
471 mutex_unlock(&local->iflist_mtx);
472
473 synchronize_net();
474
475 mutex_lock(&local->mtx);
476 ieee80211_vif_release_channel(sdata);
477 mutex_unlock(&local->mtx);
478
479 drv_remove_interface(local, sdata);
480
481 kfree(sdata);
482 }
483
484 /*
485 * NOTE: Be very careful when changing this function, it must NOT return
486 * an error on interface type changes that have been pre-checked, so most
487 * checks should be in ieee80211_check_concurrent_iface.
488 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
490 {
491 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
492 struct net_device *dev = wdev->netdev;
493 struct ieee80211_local *local = sdata->local;
494 struct sta_info *sta;
495 u32 changed = 0;
496 int res;
497 u32 hw_reconf_flags = 0;
498
499 switch (sdata->vif.type) {
500 case NL80211_IFTYPE_WDS:
501 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
502 return -ENOLINK;
503 break;
504 case NL80211_IFTYPE_AP_VLAN: {
505 struct ieee80211_sub_if_data *master;
506
507 if (!sdata->bss)
508 return -ENOLINK;
509
510 mutex_lock(&local->mtx);
511 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
512 mutex_unlock(&local->mtx);
513
514 master = container_of(sdata->bss,
515 struct ieee80211_sub_if_data, u.ap);
516 sdata->control_port_protocol =
517 master->control_port_protocol;
518 sdata->control_port_no_encrypt =
519 master->control_port_no_encrypt;
520 sdata->control_port_over_nl80211 =
521 master->control_port_over_nl80211;
522 sdata->vif.cab_queue = master->vif.cab_queue;
523 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524 sizeof(sdata->vif.hw_queue));
525 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
526
527 mutex_lock(&local->key_mtx);
528 sdata->crypto_tx_tailroom_needed_cnt +=
529 master->crypto_tx_tailroom_needed_cnt;
530 mutex_unlock(&local->key_mtx);
531
532 break;
533 }
534 case NL80211_IFTYPE_AP:
535 sdata->bss = &sdata->u.ap;
536 break;
537 case NL80211_IFTYPE_MESH_POINT:
538 case NL80211_IFTYPE_STATION:
539 case NL80211_IFTYPE_MONITOR:
540 case NL80211_IFTYPE_ADHOC:
541 case NL80211_IFTYPE_P2P_DEVICE:
542 case NL80211_IFTYPE_OCB:
543 case NL80211_IFTYPE_NAN:
544 /* no special treatment */
545 break;
546 case NL80211_IFTYPE_UNSPECIFIED:
547 case NUM_NL80211_IFTYPES:
548 case NL80211_IFTYPE_P2P_CLIENT:
549 case NL80211_IFTYPE_P2P_GO:
550 /* cannot happen */
551 WARN_ON(1);
552 break;
553 }
554
555 if (local->open_count == 0) {
556 res = drv_start(local);
557 if (res)
558 goto err_del_bss;
559 /* we're brought up, everything changes */
560 hw_reconf_flags = ~0;
561 ieee80211_led_radio(local, true);
562 ieee80211_mod_tpt_led_trig(local,
563 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
564 }
565
566 /*
567 * Copy the hopefully now-present MAC address to
568 * this interface, if it has the special null one.
569 */
570 if (dev && is_zero_ether_addr(dev->dev_addr)) {
571 memcpy(dev->dev_addr,
572 local->hw.wiphy->perm_addr,
573 ETH_ALEN);
574 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
575
576 if (!is_valid_ether_addr(dev->dev_addr)) {
577 res = -EADDRNOTAVAIL;
578 goto err_stop;
579 }
580 }
581
582 switch (sdata->vif.type) {
583 case NL80211_IFTYPE_AP_VLAN:
584 /* no need to tell driver, but set carrier and chanctx */
585 if (rtnl_dereference(sdata->bss->beacon)) {
586 ieee80211_vif_vlan_copy_chanctx(sdata);
587 netif_carrier_on(dev);
588 } else {
589 netif_carrier_off(dev);
590 }
591 break;
592 case NL80211_IFTYPE_MONITOR:
593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
594 local->cooked_mntrs++;
595 break;
596 }
597
598 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
599 res = drv_add_interface(local, sdata);
600 if (res)
601 goto err_stop;
602 } else if (local->monitors == 0 && local->open_count == 0) {
603 res = ieee80211_add_virtual_monitor(local);
604 if (res)
605 goto err_stop;
606 }
607
608 /* must be before the call to ieee80211_configure_filter */
609 local->monitors++;
610 if (local->monitors == 1) {
611 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
612 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
613 }
614
615 ieee80211_adjust_monitor_flags(sdata, 1);
616 ieee80211_configure_filter(local);
617 mutex_lock(&local->mtx);
618 ieee80211_recalc_idle(local);
619 mutex_unlock(&local->mtx);
620
621 netif_carrier_on(dev);
622 break;
623 default:
624 if (coming_up) {
625 ieee80211_del_virtual_monitor(local);
626
627 res = drv_add_interface(local, sdata);
628 if (res)
629 goto err_stop;
630 res = ieee80211_check_queues(sdata,
631 ieee80211_vif_type_p2p(&sdata->vif));
632 if (res)
633 goto err_del_interface;
634 }
635
636 if (sdata->vif.type == NL80211_IFTYPE_AP) {
637 local->fif_pspoll++;
638 local->fif_probe_req++;
639
640 ieee80211_configure_filter(local);
641 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
642 local->fif_probe_req++;
643 }
644
645 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
646 sdata->vif.type != NL80211_IFTYPE_NAN)
647 changed |= ieee80211_reset_erp_info(sdata);
648 ieee80211_bss_info_change_notify(sdata, changed);
649
650 switch (sdata->vif.type) {
651 case NL80211_IFTYPE_STATION:
652 case NL80211_IFTYPE_ADHOC:
653 case NL80211_IFTYPE_AP:
654 case NL80211_IFTYPE_MESH_POINT:
655 case NL80211_IFTYPE_OCB:
656 netif_carrier_off(dev);
657 break;
658 case NL80211_IFTYPE_WDS:
659 case NL80211_IFTYPE_P2P_DEVICE:
660 case NL80211_IFTYPE_NAN:
661 break;
662 default:
663 /* not reached */
664 WARN_ON(1);
665 }
666
667 /*
668 * Set default queue parameters so drivers don't
669 * need to initialise the hardware if the hardware
670 * doesn't start up with sane defaults.
671 * Enable QoS for anything but station interfaces.
672 */
673 ieee80211_set_wmm_default(sdata, true,
674 sdata->vif.type != NL80211_IFTYPE_STATION);
675 }
676
677 set_bit(SDATA_STATE_RUNNING, &sdata->state);
678
679 switch (sdata->vif.type) {
680 case NL80211_IFTYPE_WDS:
681 /* Create STA entry for the WDS peer */
682 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
683 GFP_KERNEL);
684 if (!sta) {
685 res = -ENOMEM;
686 goto err_del_interface;
687 }
688
689 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
690 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
691 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
692
693 res = sta_info_insert(sta);
694 if (res) {
695 /* STA has been freed */
696 goto err_del_interface;
697 }
698
699 rate_control_rate_init(sta);
700 netif_carrier_on(dev);
701 break;
702 case NL80211_IFTYPE_P2P_DEVICE:
703 rcu_assign_pointer(local->p2p_sdata, sdata);
704 break;
705 case NL80211_IFTYPE_MONITOR:
706 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
707 break;
708 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
709 break;
710 default:
711 break;
712 }
713
714 /*
715 * set_multicast_list will be invoked by the networking core
716 * which will check whether any increments here were done in
717 * error and sync them down to the hardware as filter flags.
718 */
719 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
720 atomic_inc(&local->iff_allmultis);
721
722 if (coming_up)
723 local->open_count++;
724
725 if (hw_reconf_flags)
726 ieee80211_hw_config(local, hw_reconf_flags);
727
728 ieee80211_recalc_ps(local);
729
730 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
731 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
732 local->ops->wake_tx_queue) {
733 /* XXX: for AP_VLAN, actually track AP queues */
734 if (dev)
735 netif_tx_start_all_queues(dev);
736 } else if (dev) {
737 unsigned long flags;
738 int n_acs = IEEE80211_NUM_ACS;
739 int ac;
740
741 if (local->hw.queues < IEEE80211_NUM_ACS)
742 n_acs = 1;
743
744 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
745 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
746 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
747 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
748 for (ac = 0; ac < n_acs; ac++) {
749 int ac_queue = sdata->vif.hw_queue[ac];
750
751 if (local->queue_stop_reasons[ac_queue] == 0 &&
752 skb_queue_empty(&local->pending[ac_queue]))
753 netif_start_subqueue(dev, ac);
754 }
755 }
756 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
757 }
758
759 return 0;
760 err_del_interface:
761 drv_remove_interface(local, sdata);
762 err_stop:
763 if (!local->open_count)
764 drv_stop(local);
765 err_del_bss:
766 sdata->bss = NULL;
767 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
768 mutex_lock(&local->mtx);
769 list_del(&sdata->u.vlan.list);
770 mutex_unlock(&local->mtx);
771 }
772 /* might already be clear but that doesn't matter */
773 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
774 return res;
775 }
776
ieee80211_open(struct net_device * dev)777 static int ieee80211_open(struct net_device *dev)
778 {
779 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
780 int err;
781
782 /* fail early if user set an invalid address */
783 if (!is_valid_ether_addr(dev->dev_addr))
784 return -EADDRNOTAVAIL;
785
786 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
787 if (err)
788 return err;
789
790 return ieee80211_do_open(&sdata->wdev, true);
791 }
792
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)793 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
794 bool going_down)
795 {
796 struct ieee80211_local *local = sdata->local;
797 unsigned long flags;
798 struct sk_buff *skb, *tmp;
799 u32 hw_reconf_flags = 0;
800 int i, flushed;
801 struct ps_data *ps;
802 struct cfg80211_chan_def chandef;
803 bool cancel_scan;
804 struct cfg80211_nan_func *func;
805
806 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
807
808 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
809 if (cancel_scan)
810 ieee80211_scan_cancel(local);
811
812 /*
813 * Stop TX on this interface first.
814 */
815 if (sdata->dev)
816 netif_tx_stop_all_queues(sdata->dev);
817
818 ieee80211_roc_purge(local, sdata);
819
820 switch (sdata->vif.type) {
821 case NL80211_IFTYPE_STATION:
822 ieee80211_mgd_stop(sdata);
823 break;
824 case NL80211_IFTYPE_ADHOC:
825 ieee80211_ibss_stop(sdata);
826 break;
827 case NL80211_IFTYPE_AP:
828 cancel_work_sync(&sdata->u.ap.request_smps_work);
829 break;
830 case NL80211_IFTYPE_MONITOR:
831 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
832 break;
833 list_del_rcu(&sdata->u.mntr.list);
834 break;
835 default:
836 break;
837 }
838
839 /*
840 * Remove all stations associated with this interface.
841 *
842 * This must be done before calling ops->remove_interface()
843 * because otherwise we can later invoke ops->sta_notify()
844 * whenever the STAs are removed, and that invalidates driver
845 * assumptions about always getting a vif pointer that is valid
846 * (because if we remove a STA after ops->remove_interface()
847 * the driver will have removed the vif info already!)
848 *
849 * In WDS mode a station must exist here and be flushed, for
850 * AP_VLANs stations may exist since there's nothing else that
851 * would have removed them, but in other modes there shouldn't
852 * be any stations.
853 */
854 flushed = sta_info_flush(sdata);
855 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
856 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
857 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
858
859 /* don't count this interface for allmulti while it is down */
860 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
861 atomic_dec(&local->iff_allmultis);
862
863 if (sdata->vif.type == NL80211_IFTYPE_AP) {
864 local->fif_pspoll--;
865 local->fif_probe_req--;
866 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
867 local->fif_probe_req--;
868 }
869
870 if (sdata->dev) {
871 netif_addr_lock_bh(sdata->dev);
872 spin_lock_bh(&local->filter_lock);
873 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
874 sdata->dev->addr_len);
875 spin_unlock_bh(&local->filter_lock);
876 netif_addr_unlock_bh(sdata->dev);
877 }
878
879 del_timer_sync(&local->dynamic_ps_timer);
880 cancel_work_sync(&local->dynamic_ps_enable_work);
881
882 cancel_work_sync(&sdata->recalc_smps);
883 sdata_lock(sdata);
884 mutex_lock(&local->mtx);
885 sdata->vif.csa_active = false;
886 if (sdata->vif.type == NL80211_IFTYPE_STATION)
887 sdata->u.mgd.csa_waiting_bcn = false;
888 if (sdata->csa_block_tx) {
889 ieee80211_wake_vif_queues(local, sdata,
890 IEEE80211_QUEUE_STOP_REASON_CSA);
891 sdata->csa_block_tx = false;
892 }
893 mutex_unlock(&local->mtx);
894 sdata_unlock(sdata);
895
896 cancel_work_sync(&sdata->csa_finalize_work);
897
898 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
899
900 if (sdata->wdev.cac_started) {
901 chandef = sdata->vif.bss_conf.chandef;
902 WARN_ON(local->suspended);
903 mutex_lock(&local->mtx);
904 ieee80211_vif_release_channel(sdata);
905 mutex_unlock(&local->mtx);
906 cfg80211_cac_event(sdata->dev, &chandef,
907 NL80211_RADAR_CAC_ABORTED,
908 GFP_KERNEL);
909 }
910
911 /* APs need special treatment */
912 if (sdata->vif.type == NL80211_IFTYPE_AP) {
913 struct ieee80211_sub_if_data *vlan, *tmpsdata;
914
915 /* down all dependent devices, that is VLANs */
916 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
917 u.vlan.list)
918 dev_close(vlan->dev);
919 WARN_ON(!list_empty(&sdata->u.ap.vlans));
920 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
921 /* remove all packets in parent bc_buf pointing to this dev */
922 ps = &sdata->bss->ps;
923
924 spin_lock_irqsave(&ps->bc_buf.lock, flags);
925 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
926 if (skb->dev == sdata->dev) {
927 __skb_unlink(skb, &ps->bc_buf);
928 local->total_ps_buffered--;
929 ieee80211_free_txskb(&local->hw, skb);
930 }
931 }
932 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
933 }
934
935 if (going_down)
936 local->open_count--;
937
938 switch (sdata->vif.type) {
939 case NL80211_IFTYPE_AP_VLAN:
940 mutex_lock(&local->mtx);
941 list_del(&sdata->u.vlan.list);
942 mutex_unlock(&local->mtx);
943 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
944 /* see comment in the default case below */
945 ieee80211_free_keys(sdata, true);
946 /* no need to tell driver */
947 break;
948 case NL80211_IFTYPE_MONITOR:
949 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
950 local->cooked_mntrs--;
951 break;
952 }
953
954 local->monitors--;
955 if (local->monitors == 0) {
956 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
957 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
958 }
959
960 ieee80211_adjust_monitor_flags(sdata, -1);
961 break;
962 case NL80211_IFTYPE_NAN:
963 /* clean all the functions */
964 spin_lock_bh(&sdata->u.nan.func_lock);
965
966 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
967 idr_remove(&sdata->u.nan.function_inst_ids, i);
968 cfg80211_free_nan_func(func);
969 }
970 idr_destroy(&sdata->u.nan.function_inst_ids);
971
972 spin_unlock_bh(&sdata->u.nan.func_lock);
973 break;
974 case NL80211_IFTYPE_P2P_DEVICE:
975 /* relies on synchronize_rcu() below */
976 RCU_INIT_POINTER(local->p2p_sdata, NULL);
977 /* fall through */
978 default:
979 cancel_work_sync(&sdata->work);
980 /*
981 * When we get here, the interface is marked down.
982 * Free the remaining keys, if there are any
983 * (which can happen in AP mode if userspace sets
984 * keys before the interface is operating, and maybe
985 * also in WDS mode)
986 *
987 * Force the key freeing to always synchronize_net()
988 * to wait for the RX path in case it is using this
989 * interface enqueuing frames at this very time on
990 * another CPU.
991 */
992 ieee80211_free_keys(sdata, true);
993 skb_queue_purge(&sdata->skb_queue);
994 }
995
996 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
997 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
998 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
999 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1000 if (info->control.vif == &sdata->vif) {
1001 __skb_unlink(skb, &local->pending[i]);
1002 ieee80211_free_txskb(&local->hw, skb);
1003 }
1004 }
1005 }
1006 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1007
1008 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1009 ieee80211_txq_remove_vlan(local, sdata);
1010
1011 sdata->bss = NULL;
1012
1013 if (local->open_count == 0)
1014 ieee80211_clear_tx_pending(local);
1015
1016 sdata->vif.bss_conf.beacon_int = 0;
1017
1018 /*
1019 * If the interface goes down while suspended, presumably because
1020 * the device was unplugged and that happens before our resume,
1021 * then the driver is already unconfigured and the remainder of
1022 * this function isn't needed.
1023 * XXX: what about WoWLAN? If the device has software state, e.g.
1024 * memory allocated, it might expect teardown commands from
1025 * mac80211 here?
1026 */
1027 if (local->suspended) {
1028 WARN_ON(local->wowlan);
1029 WARN_ON(rtnl_dereference(local->monitor_sdata));
1030 return;
1031 }
1032
1033 switch (sdata->vif.type) {
1034 case NL80211_IFTYPE_AP_VLAN:
1035 break;
1036 case NL80211_IFTYPE_MONITOR:
1037 if (local->monitors == 0)
1038 ieee80211_del_virtual_monitor(local);
1039
1040 mutex_lock(&local->mtx);
1041 ieee80211_recalc_idle(local);
1042 mutex_unlock(&local->mtx);
1043
1044 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1045 break;
1046
1047 /* fall through */
1048 default:
1049 if (going_down)
1050 drv_remove_interface(local, sdata);
1051 }
1052
1053 ieee80211_recalc_ps(local);
1054
1055 if (cancel_scan)
1056 flush_delayed_work(&local->scan_work);
1057
1058 if (local->open_count == 0) {
1059 ieee80211_stop_device(local);
1060
1061 /* no reconfiguring after stop! */
1062 return;
1063 }
1064
1065 /* do after stop to avoid reconfiguring when we stop anyway */
1066 ieee80211_configure_filter(local);
1067 ieee80211_hw_config(local, hw_reconf_flags);
1068
1069 if (local->monitors == local->open_count)
1070 ieee80211_add_virtual_monitor(local);
1071 }
1072
ieee80211_stop(struct net_device * dev)1073 static int ieee80211_stop(struct net_device *dev)
1074 {
1075 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1076
1077 ieee80211_do_stop(sdata, true);
1078
1079 return 0;
1080 }
1081
ieee80211_set_multicast_list(struct net_device * dev)1082 static void ieee80211_set_multicast_list(struct net_device *dev)
1083 {
1084 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1085 struct ieee80211_local *local = sdata->local;
1086 int allmulti, sdata_allmulti;
1087
1088 allmulti = !!(dev->flags & IFF_ALLMULTI);
1089 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1090
1091 if (allmulti != sdata_allmulti) {
1092 if (dev->flags & IFF_ALLMULTI)
1093 atomic_inc(&local->iff_allmultis);
1094 else
1095 atomic_dec(&local->iff_allmultis);
1096 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1097 }
1098
1099 spin_lock_bh(&local->filter_lock);
1100 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1101 spin_unlock_bh(&local->filter_lock);
1102 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1103 }
1104
1105 /*
1106 * Called when the netdev is removed or, by the code below, before
1107 * the interface type changes.
1108 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)1109 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1110 {
1111 /* free extra data */
1112 ieee80211_free_keys(sdata, false);
1113
1114 ieee80211_debugfs_remove_netdev(sdata);
1115
1116 ieee80211_destroy_frag_cache(&sdata->frags);
1117
1118 if (ieee80211_vif_is_mesh(&sdata->vif))
1119 ieee80211_mesh_teardown_sdata(sdata);
1120 }
1121
ieee80211_uninit(struct net_device * dev)1122 static void ieee80211_uninit(struct net_device *dev)
1123 {
1124 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1125 }
1126
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)1127 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1128 struct sk_buff *skb,
1129 struct net_device *sb_dev)
1130 {
1131 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1132 }
1133
1134 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)1135 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1136 {
1137 int i;
1138
1139 for_each_possible_cpu(i) {
1140 const struct pcpu_sw_netstats *tstats;
1141 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1142 unsigned int start;
1143
1144 tstats = per_cpu_ptr(dev->tstats, i);
1145
1146 do {
1147 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1148 rx_packets = tstats->rx_packets;
1149 tx_packets = tstats->tx_packets;
1150 rx_bytes = tstats->rx_bytes;
1151 tx_bytes = tstats->tx_bytes;
1152 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1153
1154 stats->rx_packets += rx_packets;
1155 stats->tx_packets += tx_packets;
1156 stats->rx_bytes += rx_bytes;
1157 stats->tx_bytes += tx_bytes;
1158 }
1159 }
1160
1161 static const struct net_device_ops ieee80211_dataif_ops = {
1162 .ndo_open = ieee80211_open,
1163 .ndo_stop = ieee80211_stop,
1164 .ndo_uninit = ieee80211_uninit,
1165 .ndo_start_xmit = ieee80211_subif_start_xmit,
1166 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1167 .ndo_set_mac_address = ieee80211_change_mac,
1168 .ndo_select_queue = ieee80211_netdev_select_queue,
1169 .ndo_get_stats64 = ieee80211_get_stats64,
1170 };
1171
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)1172 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1173 struct sk_buff *skb,
1174 struct net_device *sb_dev)
1175 {
1176 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1177 struct ieee80211_local *local = sdata->local;
1178 struct ieee80211_hdr *hdr;
1179 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1180
1181 if (local->hw.queues < IEEE80211_NUM_ACS)
1182 return 0;
1183
1184 if (skb->len < 4 ||
1185 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1186 return 0; /* doesn't matter, frame will be dropped */
1187
1188 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1189
1190 return ieee80211_select_queue_80211(sdata, skb, hdr);
1191 }
1192
1193 static const struct net_device_ops ieee80211_monitorif_ops = {
1194 .ndo_open = ieee80211_open,
1195 .ndo_stop = ieee80211_stop,
1196 .ndo_uninit = ieee80211_uninit,
1197 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1198 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1199 .ndo_set_mac_address = ieee80211_change_mac,
1200 .ndo_select_queue = ieee80211_monitor_select_queue,
1201 .ndo_get_stats64 = ieee80211_get_stats64,
1202 };
1203
ieee80211_if_free(struct net_device * dev)1204 static void ieee80211_if_free(struct net_device *dev)
1205 {
1206 free_percpu(dev->tstats);
1207 }
1208
ieee80211_if_setup(struct net_device * dev)1209 static void ieee80211_if_setup(struct net_device *dev)
1210 {
1211 ether_setup(dev);
1212 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1213 dev->netdev_ops = &ieee80211_dataif_ops;
1214 dev->needs_free_netdev = true;
1215 dev->priv_destructor = ieee80211_if_free;
1216 }
1217
ieee80211_if_setup_no_queue(struct net_device * dev)1218 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1219 {
1220 ieee80211_if_setup(dev);
1221 dev->priv_flags |= IFF_NO_QUEUE;
1222 }
1223
ieee80211_iface_work(struct work_struct * work)1224 static void ieee80211_iface_work(struct work_struct *work)
1225 {
1226 struct ieee80211_sub_if_data *sdata =
1227 container_of(work, struct ieee80211_sub_if_data, work);
1228 struct ieee80211_local *local = sdata->local;
1229 struct sk_buff *skb;
1230 struct sta_info *sta;
1231
1232 if (!ieee80211_sdata_running(sdata))
1233 return;
1234
1235 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1236 return;
1237
1238 if (!ieee80211_can_run_worker(local))
1239 return;
1240
1241 /* first process frames */
1242 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1243 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1244
1245 if (ieee80211_is_action(mgmt->frame_control) &&
1246 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1247 int len = skb->len;
1248
1249 mutex_lock(&local->sta_mtx);
1250 sta = sta_info_get_bss(sdata, mgmt->sa);
1251 if (sta) {
1252 switch (mgmt->u.action.u.addba_req.action_code) {
1253 case WLAN_ACTION_ADDBA_REQ:
1254 ieee80211_process_addba_request(
1255 local, sta, mgmt, len);
1256 break;
1257 case WLAN_ACTION_ADDBA_RESP:
1258 ieee80211_process_addba_resp(local, sta,
1259 mgmt, len);
1260 break;
1261 case WLAN_ACTION_DELBA:
1262 ieee80211_process_delba(sdata, sta,
1263 mgmt, len);
1264 break;
1265 default:
1266 WARN_ON(1);
1267 break;
1268 }
1269 }
1270 mutex_unlock(&local->sta_mtx);
1271 } else if (ieee80211_is_action(mgmt->frame_control) &&
1272 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1273 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1274 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1275 struct ieee80211_rx_status *status;
1276 enum nl80211_band band;
1277 u8 opmode;
1278
1279 status = IEEE80211_SKB_RXCB(skb);
1280 band = status->band;
1281 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1282
1283 mutex_lock(&local->sta_mtx);
1284 sta = sta_info_get_bss(sdata, mgmt->sa);
1285
1286 if (sta)
1287 ieee80211_vht_handle_opmode(sdata, sta,
1288 opmode,
1289 band);
1290
1291 mutex_unlock(&local->sta_mtx);
1292 break;
1293 }
1294 case WLAN_VHT_ACTION_GROUPID_MGMT:
1295 ieee80211_process_mu_groups(sdata, mgmt);
1296 break;
1297 default:
1298 WARN_ON(1);
1299 break;
1300 }
1301 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1302 struct ieee80211_hdr *hdr = (void *)mgmt;
1303 /*
1304 * So the frame isn't mgmt, but frame_control
1305 * is at the right place anyway, of course, so
1306 * the if statement is correct.
1307 *
1308 * Warn if we have other data frame types here,
1309 * they must not get here.
1310 */
1311 WARN_ON(hdr->frame_control &
1312 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1313 WARN_ON(!(hdr->seq_ctrl &
1314 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1315 /*
1316 * This was a fragment of a frame, received while
1317 * a block-ack session was active. That cannot be
1318 * right, so terminate the session.
1319 */
1320 mutex_lock(&local->sta_mtx);
1321 sta = sta_info_get_bss(sdata, mgmt->sa);
1322 if (sta) {
1323 u16 tid = ieee80211_get_tid(hdr);
1324
1325 __ieee80211_stop_rx_ba_session(
1326 sta, tid, WLAN_BACK_RECIPIENT,
1327 WLAN_REASON_QSTA_REQUIRE_SETUP,
1328 true);
1329 }
1330 mutex_unlock(&local->sta_mtx);
1331 } else switch (sdata->vif.type) {
1332 case NL80211_IFTYPE_STATION:
1333 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1334 break;
1335 case NL80211_IFTYPE_ADHOC:
1336 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1337 break;
1338 case NL80211_IFTYPE_MESH_POINT:
1339 if (!ieee80211_vif_is_mesh(&sdata->vif))
1340 break;
1341 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1342 break;
1343 default:
1344 WARN(1, "frame for unexpected interface type");
1345 break;
1346 }
1347
1348 kfree_skb(skb);
1349 }
1350
1351 /* then other type-dependent work */
1352 switch (sdata->vif.type) {
1353 case NL80211_IFTYPE_STATION:
1354 ieee80211_sta_work(sdata);
1355 break;
1356 case NL80211_IFTYPE_ADHOC:
1357 ieee80211_ibss_work(sdata);
1358 break;
1359 case NL80211_IFTYPE_MESH_POINT:
1360 if (!ieee80211_vif_is_mesh(&sdata->vif))
1361 break;
1362 ieee80211_mesh_work(sdata);
1363 break;
1364 case NL80211_IFTYPE_OCB:
1365 ieee80211_ocb_work(sdata);
1366 break;
1367 default:
1368 break;
1369 }
1370 }
1371
ieee80211_recalc_smps_work(struct work_struct * work)1372 static void ieee80211_recalc_smps_work(struct work_struct *work)
1373 {
1374 struct ieee80211_sub_if_data *sdata =
1375 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1376
1377 ieee80211_recalc_smps(sdata);
1378 }
1379
1380 /*
1381 * Helper function to initialise an interface to a specific type.
1382 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1383 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1384 enum nl80211_iftype type)
1385 {
1386 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1387 0xff, 0xff, 0xff};
1388
1389 /* clear type-dependent union */
1390 memset(&sdata->u, 0, sizeof(sdata->u));
1391
1392 /* and set some type-dependent values */
1393 sdata->vif.type = type;
1394 sdata->vif.p2p = false;
1395 sdata->wdev.iftype = type;
1396
1397 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1398 sdata->control_port_no_encrypt = false;
1399 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1400 sdata->vif.bss_conf.idle = true;
1401
1402 sdata->noack_map = 0;
1403
1404 /* only monitor/p2p-device differ */
1405 if (sdata->dev) {
1406 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1407 sdata->dev->type = ARPHRD_ETHER;
1408 }
1409
1410 skb_queue_head_init(&sdata->skb_queue);
1411 INIT_WORK(&sdata->work, ieee80211_iface_work);
1412 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1413 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1414 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1415 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1416
1417 switch (type) {
1418 case NL80211_IFTYPE_P2P_GO:
1419 type = NL80211_IFTYPE_AP;
1420 sdata->vif.type = type;
1421 sdata->vif.p2p = true;
1422 /* fall through */
1423 case NL80211_IFTYPE_AP:
1424 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1425 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1426 INIT_WORK(&sdata->u.ap.request_smps_work,
1427 ieee80211_request_smps_ap_work);
1428 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1429 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1430 break;
1431 case NL80211_IFTYPE_P2P_CLIENT:
1432 type = NL80211_IFTYPE_STATION;
1433 sdata->vif.type = type;
1434 sdata->vif.p2p = true;
1435 /* fall through */
1436 case NL80211_IFTYPE_STATION:
1437 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1438 ieee80211_sta_setup_sdata(sdata);
1439 break;
1440 case NL80211_IFTYPE_OCB:
1441 sdata->vif.bss_conf.bssid = bssid_wildcard;
1442 ieee80211_ocb_setup_sdata(sdata);
1443 break;
1444 case NL80211_IFTYPE_ADHOC:
1445 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1446 ieee80211_ibss_setup_sdata(sdata);
1447 break;
1448 case NL80211_IFTYPE_MESH_POINT:
1449 if (ieee80211_vif_is_mesh(&sdata->vif))
1450 ieee80211_mesh_init_sdata(sdata);
1451 break;
1452 case NL80211_IFTYPE_MONITOR:
1453 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1454 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1455 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1456 MONITOR_FLAG_OTHER_BSS;
1457 break;
1458 case NL80211_IFTYPE_WDS:
1459 sdata->vif.bss_conf.bssid = NULL;
1460 break;
1461 case NL80211_IFTYPE_NAN:
1462 idr_init(&sdata->u.nan.function_inst_ids);
1463 spin_lock_init(&sdata->u.nan.func_lock);
1464 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1465 break;
1466 case NL80211_IFTYPE_AP_VLAN:
1467 case NL80211_IFTYPE_P2P_DEVICE:
1468 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1469 break;
1470 case NL80211_IFTYPE_UNSPECIFIED:
1471 case NUM_NL80211_IFTYPES:
1472 WARN_ON(1);
1473 break;
1474 }
1475
1476 ieee80211_debugfs_add_netdev(sdata);
1477 }
1478
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1479 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1480 enum nl80211_iftype type)
1481 {
1482 struct ieee80211_local *local = sdata->local;
1483 int ret, err;
1484 enum nl80211_iftype internal_type = type;
1485 bool p2p = false;
1486
1487 ASSERT_RTNL();
1488
1489 if (!local->ops->change_interface)
1490 return -EBUSY;
1491
1492 switch (sdata->vif.type) {
1493 case NL80211_IFTYPE_AP:
1494 case NL80211_IFTYPE_STATION:
1495 case NL80211_IFTYPE_ADHOC:
1496 case NL80211_IFTYPE_OCB:
1497 /*
1498 * Could maybe also all others here?
1499 * Just not sure how that interacts
1500 * with the RX/config path e.g. for
1501 * mesh.
1502 */
1503 break;
1504 default:
1505 return -EBUSY;
1506 }
1507
1508 switch (type) {
1509 case NL80211_IFTYPE_AP:
1510 case NL80211_IFTYPE_STATION:
1511 case NL80211_IFTYPE_ADHOC:
1512 case NL80211_IFTYPE_OCB:
1513 /*
1514 * Could probably support everything
1515 * but WDS here (WDS do_open can fail
1516 * under memory pressure, which this
1517 * code isn't prepared to handle).
1518 */
1519 break;
1520 case NL80211_IFTYPE_P2P_CLIENT:
1521 p2p = true;
1522 internal_type = NL80211_IFTYPE_STATION;
1523 break;
1524 case NL80211_IFTYPE_P2P_GO:
1525 p2p = true;
1526 internal_type = NL80211_IFTYPE_AP;
1527 break;
1528 default:
1529 return -EBUSY;
1530 }
1531
1532 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1533 if (ret)
1534 return ret;
1535
1536 ieee80211_stop_vif_queues(local, sdata,
1537 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1538 synchronize_net();
1539
1540 ieee80211_do_stop(sdata, false);
1541
1542 ieee80211_teardown_sdata(sdata);
1543
1544 ret = drv_change_interface(local, sdata, internal_type, p2p);
1545 if (ret)
1546 type = ieee80211_vif_type_p2p(&sdata->vif);
1547
1548 /*
1549 * Ignore return value here, there's not much we can do since
1550 * the driver changed the interface type internally already.
1551 * The warnings will hopefully make driver authors fix it :-)
1552 */
1553 ieee80211_check_queues(sdata, type);
1554
1555 ieee80211_setup_sdata(sdata, type);
1556
1557 err = ieee80211_do_open(&sdata->wdev, false);
1558 WARN(err, "type change: do_open returned %d", err);
1559
1560 ieee80211_wake_vif_queues(local, sdata,
1561 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1562 return ret;
1563 }
1564
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1565 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1566 enum nl80211_iftype type)
1567 {
1568 int ret;
1569
1570 ASSERT_RTNL();
1571
1572 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1573 return 0;
1574
1575 if (ieee80211_sdata_running(sdata)) {
1576 ret = ieee80211_runtime_change_iftype(sdata, type);
1577 if (ret)
1578 return ret;
1579 } else {
1580 /* Purge and reset type-dependent state. */
1581 ieee80211_teardown_sdata(sdata);
1582 ieee80211_setup_sdata(sdata, type);
1583 }
1584
1585 /* reset some values that shouldn't be kept across type changes */
1586 if (type == NL80211_IFTYPE_STATION)
1587 sdata->u.mgd.use_4addr = false;
1588
1589 return 0;
1590 }
1591
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1592 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1593 u8 *perm_addr, enum nl80211_iftype type)
1594 {
1595 struct ieee80211_sub_if_data *sdata;
1596 u64 mask, start, addr, val, inc;
1597 u8 *m;
1598 u8 tmp_addr[ETH_ALEN];
1599 int i;
1600
1601 /* default ... something at least */
1602 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1603
1604 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1605 local->hw.wiphy->n_addresses <= 1)
1606 return;
1607
1608 mutex_lock(&local->iflist_mtx);
1609
1610 switch (type) {
1611 case NL80211_IFTYPE_MONITOR:
1612 /* doesn't matter */
1613 break;
1614 case NL80211_IFTYPE_WDS:
1615 case NL80211_IFTYPE_AP_VLAN:
1616 /* match up with an AP interface */
1617 list_for_each_entry(sdata, &local->interfaces, list) {
1618 if (sdata->vif.type != NL80211_IFTYPE_AP)
1619 continue;
1620 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1621 break;
1622 }
1623 /* keep default if no AP interface present */
1624 break;
1625 case NL80211_IFTYPE_P2P_CLIENT:
1626 case NL80211_IFTYPE_P2P_GO:
1627 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1628 list_for_each_entry(sdata, &local->interfaces, list) {
1629 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1630 continue;
1631 if (!ieee80211_sdata_running(sdata))
1632 continue;
1633 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1634 goto out_unlock;
1635 }
1636 }
1637 /* fall through */
1638 default:
1639 /* assign a new address if possible -- try n_addresses first */
1640 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1641 bool used = false;
1642
1643 list_for_each_entry(sdata, &local->interfaces, list) {
1644 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1645 sdata->vif.addr)) {
1646 used = true;
1647 break;
1648 }
1649 }
1650
1651 if (!used) {
1652 memcpy(perm_addr,
1653 local->hw.wiphy->addresses[i].addr,
1654 ETH_ALEN);
1655 break;
1656 }
1657 }
1658
1659 /* try mask if available */
1660 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1661 break;
1662
1663 m = local->hw.wiphy->addr_mask;
1664 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1665 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1666 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1667
1668 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1669 /* not a contiguous mask ... not handled now! */
1670 pr_info("not contiguous\n");
1671 break;
1672 }
1673
1674 /*
1675 * Pick address of existing interface in case user changed
1676 * MAC address manually, default to perm_addr.
1677 */
1678 m = local->hw.wiphy->perm_addr;
1679 list_for_each_entry(sdata, &local->interfaces, list) {
1680 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1681 continue;
1682 m = sdata->vif.addr;
1683 break;
1684 }
1685 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1686 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1687 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1688
1689 inc = 1ULL<<__ffs64(mask);
1690 val = (start & mask);
1691 addr = (start & ~mask) | (val & mask);
1692 do {
1693 bool used = false;
1694
1695 tmp_addr[5] = addr >> 0*8;
1696 tmp_addr[4] = addr >> 1*8;
1697 tmp_addr[3] = addr >> 2*8;
1698 tmp_addr[2] = addr >> 3*8;
1699 tmp_addr[1] = addr >> 4*8;
1700 tmp_addr[0] = addr >> 5*8;
1701
1702 val += inc;
1703
1704 list_for_each_entry(sdata, &local->interfaces, list) {
1705 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1706 used = true;
1707 break;
1708 }
1709 }
1710
1711 if (!used) {
1712 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1713 break;
1714 }
1715 addr = (start & ~mask) | (val & mask);
1716 } while (addr != start);
1717
1718 break;
1719 }
1720
1721 out_unlock:
1722 mutex_unlock(&local->iflist_mtx);
1723 }
1724
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)1725 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1726 unsigned char name_assign_type,
1727 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1728 struct vif_params *params)
1729 {
1730 struct net_device *ndev = NULL;
1731 struct ieee80211_sub_if_data *sdata = NULL;
1732 struct txq_info *txqi;
1733 void (*if_setup)(struct net_device *dev);
1734 int ret, i;
1735 int txqs = 1;
1736
1737 ASSERT_RTNL();
1738
1739 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1740 struct wireless_dev *wdev;
1741
1742 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1743 GFP_KERNEL);
1744 if (!sdata)
1745 return -ENOMEM;
1746 wdev = &sdata->wdev;
1747
1748 sdata->dev = NULL;
1749 strlcpy(sdata->name, name, IFNAMSIZ);
1750 ieee80211_assign_perm_addr(local, wdev->address, type);
1751 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1752 } else {
1753 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1754 sizeof(void *));
1755 int txq_size = 0;
1756
1757 if (local->ops->wake_tx_queue &&
1758 type != NL80211_IFTYPE_AP_VLAN &&
1759 (type != NL80211_IFTYPE_MONITOR ||
1760 (params->flags & MONITOR_FLAG_ACTIVE)))
1761 txq_size += sizeof(struct txq_info) +
1762 local->hw.txq_data_size;
1763
1764 if (local->ops->wake_tx_queue) {
1765 if_setup = ieee80211_if_setup_no_queue;
1766 } else {
1767 if_setup = ieee80211_if_setup;
1768 if (local->hw.queues >= IEEE80211_NUM_ACS)
1769 txqs = IEEE80211_NUM_ACS;
1770 }
1771
1772 ndev = alloc_netdev_mqs(size + txq_size,
1773 name, name_assign_type,
1774 if_setup, txqs, 1);
1775 if (!ndev)
1776 return -ENOMEM;
1777 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1778
1779 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1780 if (!ndev->tstats) {
1781 free_netdev(ndev);
1782 return -ENOMEM;
1783 }
1784
1785 ndev->needed_headroom = local->tx_headroom +
1786 4*6 /* four MAC addresses */
1787 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1788 + 6 /* mesh */
1789 + 8 /* rfc1042/bridge tunnel */
1790 - ETH_HLEN /* ethernet hard_header_len */
1791 + IEEE80211_ENCRYPT_HEADROOM;
1792 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1793
1794 ret = dev_alloc_name(ndev, ndev->name);
1795 if (ret < 0) {
1796 ieee80211_if_free(ndev);
1797 free_netdev(ndev);
1798 return ret;
1799 }
1800
1801 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1802 if (is_valid_ether_addr(params->macaddr))
1803 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1804 else
1805 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1806 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1807
1808 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1809 sdata = netdev_priv(ndev);
1810 ndev->ieee80211_ptr = &sdata->wdev;
1811 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1812 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1813
1814 if (txq_size) {
1815 txqi = netdev_priv(ndev) + size;
1816 ieee80211_txq_init(sdata, NULL, txqi, 0);
1817 }
1818
1819 sdata->dev = ndev;
1820 }
1821
1822 /* initialise type-independent data */
1823 sdata->wdev.wiphy = local->hw.wiphy;
1824 sdata->local = local;
1825
1826 ieee80211_init_frag_cache(&sdata->frags);
1827
1828 INIT_LIST_HEAD(&sdata->key_list);
1829
1830 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1831 ieee80211_dfs_cac_timer_work);
1832 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1833 ieee80211_delayed_tailroom_dec);
1834
1835 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1836 struct ieee80211_supported_band *sband;
1837 sband = local->hw.wiphy->bands[i];
1838 sdata->rc_rateidx_mask[i] =
1839 sband ? (1 << sband->n_bitrates) - 1 : 0;
1840 if (sband) {
1841 __le16 cap;
1842 u16 *vht_rate_mask;
1843
1844 memcpy(sdata->rc_rateidx_mcs_mask[i],
1845 sband->ht_cap.mcs.rx_mask,
1846 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1847
1848 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1849 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1850 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1851 } else {
1852 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1853 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1854 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1855 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1856 }
1857 }
1858
1859 ieee80211_set_default_queues(sdata);
1860
1861 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1862 sdata->user_power_level = local->user_power_level;
1863
1864 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1865
1866 /* setup type-dependent data */
1867 ieee80211_setup_sdata(sdata, type);
1868
1869 if (ndev) {
1870 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1871 if (type == NL80211_IFTYPE_STATION)
1872 sdata->u.mgd.use_4addr = params->use_4addr;
1873
1874 ndev->features |= local->hw.netdev_features;
1875
1876 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1877
1878 /* MTU range is normally 256 - 2304, where the upper limit is
1879 * the maximum MSDU size. Monitor interfaces send and receive
1880 * MPDU and A-MSDU frames which may be much larger so we do
1881 * not impose an upper limit in that case.
1882 */
1883 ndev->min_mtu = 256;
1884 if (type == NL80211_IFTYPE_MONITOR)
1885 ndev->max_mtu = 0;
1886 else
1887 ndev->max_mtu = local->hw.max_mtu;
1888
1889 ret = register_netdevice(ndev);
1890 if (ret) {
1891 free_netdev(ndev);
1892 return ret;
1893 }
1894 }
1895
1896 mutex_lock(&local->iflist_mtx);
1897 list_add_tail_rcu(&sdata->list, &local->interfaces);
1898 mutex_unlock(&local->iflist_mtx);
1899
1900 if (new_wdev)
1901 *new_wdev = &sdata->wdev;
1902
1903 return 0;
1904 }
1905
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)1906 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1907 {
1908 ASSERT_RTNL();
1909
1910 mutex_lock(&sdata->local->iflist_mtx);
1911 list_del_rcu(&sdata->list);
1912 mutex_unlock(&sdata->local->iflist_mtx);
1913
1914 if (sdata->vif.txq)
1915 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1916
1917 synchronize_rcu();
1918
1919 if (sdata->dev) {
1920 unregister_netdevice(sdata->dev);
1921 } else {
1922 cfg80211_unregister_wdev(&sdata->wdev);
1923 ieee80211_teardown_sdata(sdata);
1924 kfree(sdata);
1925 }
1926 }
1927
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)1928 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1929 {
1930 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1931 return;
1932 ieee80211_do_stop(sdata, true);
1933 }
1934
ieee80211_remove_interfaces(struct ieee80211_local * local)1935 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1936 {
1937 struct ieee80211_sub_if_data *sdata, *tmp;
1938 LIST_HEAD(unreg_list);
1939 LIST_HEAD(wdev_list);
1940
1941 ASSERT_RTNL();
1942
1943 /* Before destroying the interfaces, make sure they're all stopped so
1944 * that the hardware is stopped. Otherwise, the driver might still be
1945 * iterating the interfaces during the shutdown, e.g. from a worker
1946 * or from RX processing or similar, and if it does so (using atomic
1947 * iteration) while we're manipulating the list, the iteration will
1948 * crash.
1949 *
1950 * After this, the hardware should be stopped and the driver should
1951 * have stopped all of its activities, so that we can do RCU-unaware
1952 * manipulations of the interface list below.
1953 */
1954 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1955
1956 WARN(local->open_count, "%s: open count remains %d\n",
1957 wiphy_name(local->hw.wiphy), local->open_count);
1958
1959 ieee80211_txq_teardown_flows(local);
1960
1961 mutex_lock(&local->iflist_mtx);
1962 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1963 list_del(&sdata->list);
1964
1965 if (sdata->dev)
1966 unregister_netdevice_queue(sdata->dev, &unreg_list);
1967 else
1968 list_add(&sdata->list, &wdev_list);
1969 }
1970 mutex_unlock(&local->iflist_mtx);
1971 unregister_netdevice_many(&unreg_list);
1972
1973 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1974 list_del(&sdata->list);
1975 cfg80211_unregister_wdev(&sdata->wdev);
1976 kfree(sdata);
1977 }
1978 }
1979
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)1980 static int netdev_notify(struct notifier_block *nb,
1981 unsigned long state, void *ptr)
1982 {
1983 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1984 struct ieee80211_sub_if_data *sdata;
1985
1986 if (state != NETDEV_CHANGENAME)
1987 return NOTIFY_DONE;
1988
1989 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1990 return NOTIFY_DONE;
1991
1992 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1993 return NOTIFY_DONE;
1994
1995 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1996 memcpy(sdata->name, dev->name, IFNAMSIZ);
1997 ieee80211_debugfs_rename_netdev(sdata);
1998
1999 return NOTIFY_OK;
2000 }
2001
2002 static struct notifier_block mac80211_netdev_notifier = {
2003 .notifier_call = netdev_notify,
2004 };
2005
ieee80211_iface_init(void)2006 int ieee80211_iface_init(void)
2007 {
2008 return register_netdevice_notifier(&mac80211_netdev_notifier);
2009 }
2010
ieee80211_iface_exit(void)2011 void ieee80211_iface_exit(void)
2012 {
2013 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2014 }
2015
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2016 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2017 {
2018 if (sdata->vif.type == NL80211_IFTYPE_AP)
2019 atomic_inc(&sdata->u.ap.num_mcast_sta);
2020 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2021 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2022 }
2023
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2024 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2025 {
2026 if (sdata->vif.type == NL80211_IFTYPE_AP)
2027 atomic_dec(&sdata->u.ap.num_mcast_sta);
2028 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2029 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2030 }
2031