1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This is the linux wireless configuration interface.
4 *
5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2015-2017 Intel Deutschland GmbH
8 * Copyright (C) 2018-2022 Intel Corporation
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/if.h>
14 #include <linux/module.h>
15 #include <linux/err.h>
16 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/nl80211.h>
19 #include <linux/debugfs.h>
20 #include <linux/notifier.h>
21 #include <linux/device.h>
22 #include <linux/etherdevice.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/sched.h>
25 #include <net/genetlink.h>
26 #include <net/cfg80211.h>
27 #include "nl80211.h"
28 #include "core.h"
29 #include "sysfs.h"
30 #include "debugfs.h"
31 #include "wext-compat.h"
32 #include "rdev-ops.h"
33
34 /* name for sysfs, %d is appended */
35 #define PHY_NAME "phy"
36
37 MODULE_AUTHOR("Johannes Berg");
38 MODULE_LICENSE("GPL");
39 MODULE_DESCRIPTION("wireless configuration support");
40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
41
42 /* RCU-protected (and RTNL for writers) */
43 LIST_HEAD(cfg80211_rdev_list);
44 int cfg80211_rdev_list_generation;
45
46 /* for debugfs */
47 static struct dentry *ieee80211_debugfs_dir;
48
49 /* for the cleanup, scan and event works */
50 struct workqueue_struct *cfg80211_wq;
51
52 static bool cfg80211_disable_40mhz_24ghz;
53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
55 "Disable 40MHz support in the 2.4GHz band");
56
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
58 {
59 struct cfg80211_registered_device *result = NULL, *rdev;
60
61 ASSERT_RTNL();
62
63 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
64 if (rdev->wiphy_idx == wiphy_idx) {
65 result = rdev;
66 break;
67 }
68 }
69
70 return result;
71 }
72
get_wiphy_idx(struct wiphy * wiphy)73 int get_wiphy_idx(struct wiphy *wiphy)
74 {
75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
76
77 return rdev->wiphy_idx;
78 }
79
wiphy_idx_to_wiphy(int wiphy_idx)80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
81 {
82 struct cfg80211_registered_device *rdev;
83
84 ASSERT_RTNL();
85
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
87 if (!rdev)
88 return NULL;
89 return &rdev->wiphy;
90 }
91
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
93 const char *newname)
94 {
95 struct cfg80211_registered_device *rdev2;
96 int wiphy_idx, taken = -1, digits;
97
98 ASSERT_RTNL();
99
100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
101 return -EINVAL;
102
103 /* prohibit calling the thing phy%d when %d is not its number */
104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
106 /* count number of places needed to print wiphy_idx */
107 digits = 1;
108 while (wiphy_idx /= 10)
109 digits++;
110 /*
111 * deny the name if it is phy<idx> where <idx> is printed
112 * without leading zeroes. taken == strlen(newname) here
113 */
114 if (taken == strlen(PHY_NAME) + digits)
115 return -EINVAL;
116 }
117
118 /* Ensure another device does not already have this name. */
119 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
121 return -EINVAL;
122
123 return 0;
124 }
125
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
127 char *newname)
128 {
129 int result;
130
131 ASSERT_RTNL();
132
133 /* Ignore nop renames */
134 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
135 return 0;
136
137 result = cfg80211_dev_check_name(rdev, newname);
138 if (result < 0)
139 return result;
140
141 result = device_rename(&rdev->wiphy.dev, newname);
142 if (result)
143 return result;
144
145 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
146 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
147 rdev->wiphy.debugfsdir,
148 rdev->wiphy.debugfsdir->d_parent, newname);
149
150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
151
152 return 0;
153 }
154
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
156 struct net *net)
157 {
158 struct wireless_dev *wdev;
159 int err = 0;
160
161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
162 return -EOPNOTSUPP;
163
164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
165 if (!wdev->netdev)
166 continue;
167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
169 if (err)
170 break;
171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
172 }
173
174 if (err) {
175 /* failed -- clean up to old netns */
176 net = wiphy_net(&rdev->wiphy);
177
178 list_for_each_entry_continue_reverse(wdev,
179 &rdev->wiphy.wdev_list,
180 list) {
181 if (!wdev->netdev)
182 continue;
183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
184 err = dev_change_net_namespace(wdev->netdev, net,
185 "wlan%d");
186 WARN_ON(err);
187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
188 }
189
190 return err;
191 }
192
193 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
194 if (!wdev->netdev)
195 continue;
196 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
197 }
198 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
199
200 wiphy_net_set(&rdev->wiphy, net);
201
202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
203 WARN_ON(err);
204
205 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
206 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
207 if (!wdev->netdev)
208 continue;
209 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
210 }
211
212 return 0;
213 }
214
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
216 {
217 struct cfg80211_registered_device *rdev = data;
218
219 wiphy_lock(&rdev->wiphy);
220 rdev_rfkill_poll(rdev);
221 wiphy_unlock(&rdev->wiphy);
222 }
223
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)224 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
225 struct wireless_dev *wdev)
226 {
227 lockdep_assert_held(&rdev->wiphy.mtx);
228
229 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
230 return;
231
232 if (!wdev_running(wdev))
233 return;
234
235 rdev_stop_p2p_device(rdev, wdev);
236 wdev->is_running = false;
237
238 rdev->opencount--;
239
240 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
241 if (WARN_ON(!rdev->scan_req->notified &&
242 (!rdev->int_scan_req ||
243 !rdev->int_scan_req->notified)))
244 rdev->scan_req->info.aborted = true;
245 ___cfg80211_scan_done(rdev, false);
246 }
247 }
248
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)249 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
250 struct wireless_dev *wdev)
251 {
252 lockdep_assert_held(&rdev->wiphy.mtx);
253
254 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
255 return;
256
257 if (!wdev_running(wdev))
258 return;
259
260 rdev_stop_nan(rdev, wdev);
261 wdev->is_running = false;
262
263 rdev->opencount--;
264 }
265
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)266 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
267 {
268 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
269 struct wireless_dev *wdev;
270
271 ASSERT_RTNL();
272
273 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
274 if (wdev->netdev) {
275 dev_close(wdev->netdev);
276 continue;
277 }
278
279 /* otherwise, check iftype */
280
281 wiphy_lock(wiphy);
282
283 switch (wdev->iftype) {
284 case NL80211_IFTYPE_P2P_DEVICE:
285 cfg80211_stop_p2p_device(rdev, wdev);
286 break;
287 case NL80211_IFTYPE_NAN:
288 cfg80211_stop_nan(rdev, wdev);
289 break;
290 default:
291 break;
292 }
293
294 wiphy_unlock(wiphy);
295 }
296 }
297 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
298
cfg80211_rfkill_set_block(void * data,bool blocked)299 static int cfg80211_rfkill_set_block(void *data, bool blocked)
300 {
301 struct cfg80211_registered_device *rdev = data;
302
303 if (!blocked)
304 return 0;
305
306 rtnl_lock();
307 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
308 rtnl_unlock();
309
310 return 0;
311 }
312
cfg80211_rfkill_block_work(struct work_struct * work)313 static void cfg80211_rfkill_block_work(struct work_struct *work)
314 {
315 struct cfg80211_registered_device *rdev;
316
317 rdev = container_of(work, struct cfg80211_registered_device,
318 rfkill_block);
319 cfg80211_rfkill_set_block(rdev, true);
320 }
321
cfg80211_event_work(struct work_struct * work)322 static void cfg80211_event_work(struct work_struct *work)
323 {
324 struct cfg80211_registered_device *rdev;
325
326 rdev = container_of(work, struct cfg80211_registered_device,
327 event_work);
328
329 wiphy_lock(&rdev->wiphy);
330 cfg80211_process_rdev_events(rdev);
331 wiphy_unlock(&rdev->wiphy);
332 }
333
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)334 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
335 {
336 struct wireless_dev *wdev, *tmp;
337
338 ASSERT_RTNL();
339
340 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
341 if (wdev->nl_owner_dead) {
342 if (wdev->netdev)
343 dev_close(wdev->netdev);
344
345 wiphy_lock(&rdev->wiphy);
346 cfg80211_leave(rdev, wdev);
347 cfg80211_remove_virtual_intf(rdev, wdev);
348 wiphy_unlock(&rdev->wiphy);
349 }
350 }
351 }
352
cfg80211_destroy_iface_wk(struct work_struct * work)353 static void cfg80211_destroy_iface_wk(struct work_struct *work)
354 {
355 struct cfg80211_registered_device *rdev;
356
357 rdev = container_of(work, struct cfg80211_registered_device,
358 destroy_work);
359
360 rtnl_lock();
361 cfg80211_destroy_ifaces(rdev);
362 rtnl_unlock();
363 }
364
cfg80211_sched_scan_stop_wk(struct work_struct * work)365 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
366 {
367 struct cfg80211_registered_device *rdev;
368 struct cfg80211_sched_scan_request *req, *tmp;
369
370 rdev = container_of(work, struct cfg80211_registered_device,
371 sched_scan_stop_wk);
372
373 wiphy_lock(&rdev->wiphy);
374 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
375 if (req->nl_owner_dead)
376 cfg80211_stop_sched_scan_req(rdev, req, false);
377 }
378 wiphy_unlock(&rdev->wiphy);
379 }
380
cfg80211_propagate_radar_detect_wk(struct work_struct * work)381 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
382 {
383 struct cfg80211_registered_device *rdev;
384
385 rdev = container_of(work, struct cfg80211_registered_device,
386 propagate_radar_detect_wk);
387
388 rtnl_lock();
389
390 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
391 NL80211_DFS_UNAVAILABLE,
392 NL80211_RADAR_DETECTED);
393
394 rtnl_unlock();
395 }
396
cfg80211_propagate_cac_done_wk(struct work_struct * work)397 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
398 {
399 struct cfg80211_registered_device *rdev;
400
401 rdev = container_of(work, struct cfg80211_registered_device,
402 propagate_cac_done_wk);
403
404 rtnl_lock();
405
406 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
407 NL80211_DFS_AVAILABLE,
408 NL80211_RADAR_CAC_FINISHED);
409
410 rtnl_unlock();
411 }
412
cfg80211_wiphy_work(struct work_struct * work)413 static void cfg80211_wiphy_work(struct work_struct *work)
414 {
415 struct cfg80211_registered_device *rdev;
416 struct wiphy_work *wk;
417
418 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
419
420 wiphy_lock(&rdev->wiphy);
421 if (rdev->suspended)
422 goto out;
423
424 spin_lock_irq(&rdev->wiphy_work_lock);
425 wk = list_first_entry_or_null(&rdev->wiphy_work_list,
426 struct wiphy_work, entry);
427 if (wk) {
428 list_del_init(&wk->entry);
429 if (!list_empty(&rdev->wiphy_work_list))
430 schedule_work(work);
431 spin_unlock_irq(&rdev->wiphy_work_lock);
432
433 wk->func(&rdev->wiphy, wk);
434 } else {
435 spin_unlock_irq(&rdev->wiphy_work_lock);
436 }
437 out:
438 wiphy_unlock(&rdev->wiphy);
439 }
440
441 /* exported functions */
442
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)443 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
444 const char *requested_name)
445 {
446 static atomic_t wiphy_counter = ATOMIC_INIT(0);
447
448 struct cfg80211_registered_device *rdev;
449 int alloc_size;
450
451 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
452 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
453 WARN_ON(ops->connect && !ops->disconnect);
454 WARN_ON(ops->join_ibss && !ops->leave_ibss);
455 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
456 WARN_ON(ops->add_station && !ops->del_station);
457 WARN_ON(ops->add_mpath && !ops->del_mpath);
458 WARN_ON(ops->join_mesh && !ops->leave_mesh);
459 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
460 WARN_ON(ops->start_ap && !ops->stop_ap);
461 WARN_ON(ops->join_ocb && !ops->leave_ocb);
462 WARN_ON(ops->suspend && !ops->resume);
463 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
464 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
465 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
466 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
467
468 alloc_size = sizeof(*rdev) + sizeof_priv;
469
470 rdev = kzalloc(alloc_size, GFP_KERNEL);
471 if (!rdev)
472 return NULL;
473
474 rdev->ops = ops;
475
476 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
477
478 if (unlikely(rdev->wiphy_idx < 0)) {
479 /* ugh, wrapped! */
480 atomic_dec(&wiphy_counter);
481 kfree(rdev);
482 return NULL;
483 }
484
485 /* atomic_inc_return makes it start at 1, make it start at 0 */
486 rdev->wiphy_idx--;
487
488 /* give it a proper name */
489 if (requested_name && requested_name[0]) {
490 int rv;
491
492 rtnl_lock();
493 rv = cfg80211_dev_check_name(rdev, requested_name);
494
495 if (rv < 0) {
496 rtnl_unlock();
497 goto use_default_name;
498 }
499
500 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
501 rtnl_unlock();
502 if (rv)
503 goto use_default_name;
504 } else {
505 int rv;
506
507 use_default_name:
508 /* NOTE: This is *probably* safe w/out holding rtnl because of
509 * the restrictions on phy names. Probably this call could
510 * fail if some other part of the kernel (re)named a device
511 * phyX. But, might should add some locking and check return
512 * value, and use a different name if this one exists?
513 */
514 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
515 if (rv < 0) {
516 kfree(rdev);
517 return NULL;
518 }
519 }
520
521 mutex_init(&rdev->wiphy.mtx);
522 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
523 INIT_LIST_HEAD(&rdev->beacon_registrations);
524 spin_lock_init(&rdev->beacon_registrations_lock);
525 spin_lock_init(&rdev->bss_lock);
526 INIT_LIST_HEAD(&rdev->bss_list);
527 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
528 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
529 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
530 cfg80211_dfs_channels_update_work);
531 #ifdef CONFIG_CFG80211_WEXT
532 rdev->wiphy.wext = &cfg80211_wext_handler;
533 #endif
534
535 device_initialize(&rdev->wiphy.dev);
536 rdev->wiphy.dev.class = &ieee80211_class;
537 rdev->wiphy.dev.platform_data = rdev;
538 device_enable_async_suspend(&rdev->wiphy.dev);
539
540 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
541 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
542 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
543 INIT_WORK(&rdev->propagate_radar_detect_wk,
544 cfg80211_propagate_radar_detect_wk);
545 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
546 INIT_WORK(&rdev->mgmt_registrations_update_wk,
547 cfg80211_mgmt_registrations_update_wk);
548 spin_lock_init(&rdev->mgmt_registrations_lock);
549
550 #ifdef CONFIG_CFG80211_DEFAULT_PS
551 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
552 #endif
553
554 wiphy_net_set(&rdev->wiphy, &init_net);
555
556 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
557 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
558 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
559 &rdev->rfkill_ops, rdev);
560
561 if (!rdev->wiphy.rfkill) {
562 wiphy_free(&rdev->wiphy);
563 return NULL;
564 }
565
566 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
567 INIT_LIST_HEAD(&rdev->wiphy_work_list);
568 spin_lock_init(&rdev->wiphy_work_lock);
569 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
570 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
571 INIT_WORK(&rdev->event_work, cfg80211_event_work);
572 INIT_WORK(&rdev->background_cac_abort_wk,
573 cfg80211_background_cac_abort_wk);
574 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
575 cfg80211_background_cac_done_wk);
576
577 init_waitqueue_head(&rdev->dev_wait);
578
579 /*
580 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
581 * Fragmentation and RTS threshold are disabled by default with the
582 * special -1 value.
583 */
584 rdev->wiphy.retry_short = 7;
585 rdev->wiphy.retry_long = 4;
586 rdev->wiphy.frag_threshold = (u32) -1;
587 rdev->wiphy.rts_threshold = (u32) -1;
588 rdev->wiphy.coverage_class = 0;
589
590 rdev->wiphy.max_num_csa_counters = 1;
591
592 rdev->wiphy.max_sched_scan_plans = 1;
593 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
594
595 return &rdev->wiphy;
596 }
597 EXPORT_SYMBOL(wiphy_new_nm);
598
wiphy_verify_combinations(struct wiphy * wiphy)599 static int wiphy_verify_combinations(struct wiphy *wiphy)
600 {
601 const struct ieee80211_iface_combination *c;
602 int i, j;
603
604 for (i = 0; i < wiphy->n_iface_combinations; i++) {
605 u32 cnt = 0;
606 u16 all_iftypes = 0;
607
608 c = &wiphy->iface_combinations[i];
609
610 /*
611 * Combinations with just one interface aren't real,
612 * however we make an exception for DFS.
613 */
614 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
615 return -EINVAL;
616
617 /* Need at least one channel */
618 if (WARN_ON(!c->num_different_channels))
619 return -EINVAL;
620
621 /* DFS only works on one channel. */
622 if (WARN_ON(c->radar_detect_widths &&
623 (c->num_different_channels > 1)))
624 return -EINVAL;
625
626 if (WARN_ON(!c->n_limits))
627 return -EINVAL;
628
629 for (j = 0; j < c->n_limits; j++) {
630 u16 types = c->limits[j].types;
631
632 /* interface types shouldn't overlap */
633 if (WARN_ON(types & all_iftypes))
634 return -EINVAL;
635 all_iftypes |= types;
636
637 if (WARN_ON(!c->limits[j].max))
638 return -EINVAL;
639
640 /* Shouldn't list software iftypes in combinations! */
641 if (WARN_ON(wiphy->software_iftypes & types))
642 return -EINVAL;
643
644 /* Only a single P2P_DEVICE can be allowed */
645 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
646 c->limits[j].max > 1))
647 return -EINVAL;
648
649 /* Only a single NAN can be allowed */
650 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
651 c->limits[j].max > 1))
652 return -EINVAL;
653
654 /*
655 * This isn't well-defined right now. If you have an
656 * IBSS interface, then its beacon interval may change
657 * by joining other networks, and nothing prevents it
658 * from doing that.
659 * So technically we probably shouldn't even allow AP
660 * and IBSS in the same interface, but it seems that
661 * some drivers support that, possibly only with fixed
662 * beacon intervals for IBSS.
663 */
664 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
665 c->beacon_int_min_gcd)) {
666 return -EINVAL;
667 }
668
669 cnt += c->limits[j].max;
670 /*
671 * Don't advertise an unsupported type
672 * in a combination.
673 */
674 if (WARN_ON((wiphy->interface_modes & types) != types))
675 return -EINVAL;
676 }
677
678 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
679 return -EINVAL;
680
681 /* You can't even choose that many! */
682 if (WARN_ON(cnt < c->max_interfaces))
683 return -EINVAL;
684 }
685
686 return 0;
687 }
688
wiphy_register(struct wiphy * wiphy)689 int wiphy_register(struct wiphy *wiphy)
690 {
691 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
692 int res;
693 enum nl80211_band band;
694 struct ieee80211_supported_band *sband;
695 bool have_band = false;
696 int i;
697 u16 ifmodes = wiphy->interface_modes;
698
699 #ifdef CONFIG_PM
700 if (WARN_ON(wiphy->wowlan &&
701 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
702 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
703 return -EINVAL;
704 if (WARN_ON(wiphy->wowlan &&
705 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
706 !wiphy->wowlan->tcp))
707 return -EINVAL;
708 #endif
709 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
710 (!rdev->ops->tdls_channel_switch ||
711 !rdev->ops->tdls_cancel_channel_switch)))
712 return -EINVAL;
713
714 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
715 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
716 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
717 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
718 return -EINVAL;
719
720 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
721 return -EINVAL;
722
723 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
724 return -EINVAL;
725
726 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
727 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
728 !wiphy->pmsr_capa->ftm.non_asap))
729 return -EINVAL;
730 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
731 !wiphy->pmsr_capa->ftm.bandwidths))
732 return -EINVAL;
733 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
734 ~(BIT(NL80211_PREAMBLE_LEGACY) |
735 BIT(NL80211_PREAMBLE_HT) |
736 BIT(NL80211_PREAMBLE_VHT) |
737 BIT(NL80211_PREAMBLE_HE) |
738 BIT(NL80211_PREAMBLE_DMG))))
739 return -EINVAL;
740 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
741 wiphy->pmsr_capa->ftm.non_trigger_based) &&
742 !(wiphy->pmsr_capa->ftm.preambles &
743 BIT(NL80211_PREAMBLE_HE))))
744 return -EINVAL;
745 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
746 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
747 BIT(NL80211_CHAN_WIDTH_20) |
748 BIT(NL80211_CHAN_WIDTH_40) |
749 BIT(NL80211_CHAN_WIDTH_80) |
750 BIT(NL80211_CHAN_WIDTH_80P80) |
751 BIT(NL80211_CHAN_WIDTH_160) |
752 BIT(NL80211_CHAN_WIDTH_5) |
753 BIT(NL80211_CHAN_WIDTH_10))))
754 return -EINVAL;
755 }
756
757 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
758 (wiphy->regulatory_flags &
759 (REGULATORY_CUSTOM_REG |
760 REGULATORY_STRICT_REG |
761 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
762 REGULATORY_COUNTRY_IE_IGNORE))))
763 return -EINVAL;
764
765 if (WARN_ON(wiphy->coalesce &&
766 (!wiphy->coalesce->n_rules ||
767 !wiphy->coalesce->n_patterns) &&
768 (!wiphy->coalesce->pattern_min_len ||
769 wiphy->coalesce->pattern_min_len >
770 wiphy->coalesce->pattern_max_len)))
771 return -EINVAL;
772
773 if (WARN_ON(wiphy->ap_sme_capa &&
774 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
775 return -EINVAL;
776
777 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
778 return -EINVAL;
779
780 if (WARN_ON(wiphy->addresses &&
781 !is_zero_ether_addr(wiphy->perm_addr) &&
782 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
783 ETH_ALEN)))
784 return -EINVAL;
785
786 if (WARN_ON(wiphy->max_acl_mac_addrs &&
787 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
788 !rdev->ops->set_mac_acl)))
789 return -EINVAL;
790
791 /* assure only valid behaviours are flagged by driver
792 * hence subtract 2 as bit 0 is invalid.
793 */
794 if (WARN_ON(wiphy->bss_select_support &&
795 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
796 return -EINVAL;
797
798 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
799 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
800 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
801 return -EINVAL;
802
803 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
804 rdev->ops->update_connect_params))
805 return -EINVAL;
806
807 if (wiphy->addresses)
808 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
809
810 /* sanity check ifmodes */
811 WARN_ON(!ifmodes);
812 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
813 if (WARN_ON(ifmodes != wiphy->interface_modes))
814 wiphy->interface_modes = ifmodes;
815
816 res = wiphy_verify_combinations(wiphy);
817 if (res)
818 return res;
819
820 /* sanity check supported bands/channels */
821 for (band = 0; band < NUM_NL80211_BANDS; band++) {
822 u16 types = 0;
823 bool have_he = false;
824
825 sband = wiphy->bands[band];
826 if (!sband)
827 continue;
828
829 sband->band = band;
830 if (WARN_ON(!sband->n_channels))
831 return -EINVAL;
832 /*
833 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
834 * n_bitrates is 0
835 */
836 if (WARN_ON((band != NL80211_BAND_60GHZ &&
837 band != NL80211_BAND_S1GHZ) &&
838 !sband->n_bitrates))
839 return -EINVAL;
840
841 if (WARN_ON(band == NL80211_BAND_6GHZ &&
842 (sband->ht_cap.ht_supported ||
843 sband->vht_cap.vht_supported)))
844 return -EINVAL;
845
846 /*
847 * Since cfg80211_disable_40mhz_24ghz is global, we can
848 * modify the sband's ht data even if the driver uses a
849 * global structure for that.
850 */
851 if (cfg80211_disable_40mhz_24ghz &&
852 band == NL80211_BAND_2GHZ &&
853 sband->ht_cap.ht_supported) {
854 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
855 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
856 }
857
858 /*
859 * Since we use a u32 for rate bitmaps in
860 * ieee80211_get_response_rate, we cannot
861 * have more than 32 legacy rates.
862 */
863 if (WARN_ON(sband->n_bitrates > 32))
864 return -EINVAL;
865
866 for (i = 0; i < sband->n_channels; i++) {
867 sband->channels[i].orig_flags =
868 sband->channels[i].flags;
869 sband->channels[i].orig_mag = INT_MAX;
870 sband->channels[i].orig_mpwr =
871 sband->channels[i].max_power;
872 sband->channels[i].band = band;
873
874 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
875 return -EINVAL;
876 }
877
878 for (i = 0; i < sband->n_iftype_data; i++) {
879 const struct ieee80211_sband_iftype_data *iftd;
880 bool has_ap, has_non_ap;
881 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
882 BIT(NL80211_IFTYPE_P2P_GO);
883
884 iftd = &sband->iftype_data[i];
885
886 if (WARN_ON(!iftd->types_mask))
887 return -EINVAL;
888 if (WARN_ON(types & iftd->types_mask))
889 return -EINVAL;
890
891 /* at least one piece of information must be present */
892 if (WARN_ON(!iftd->he_cap.has_he))
893 return -EINVAL;
894
895 types |= iftd->types_mask;
896
897 if (i == 0)
898 have_he = iftd->he_cap.has_he;
899 else
900 have_he = have_he &&
901 iftd->he_cap.has_he;
902
903 has_ap = iftd->types_mask & ap_bits;
904 has_non_ap = iftd->types_mask & ~ap_bits;
905
906 /*
907 * For EHT 20 MHz STA, the capabilities format differs
908 * but to simplify, don't check 20 MHz but rather check
909 * only if AP and non-AP were mentioned at the same time,
910 * reject if so.
911 */
912 if (WARN_ON(iftd->eht_cap.has_eht &&
913 has_ap && has_non_ap))
914 return -EINVAL;
915 }
916
917 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
918 return -EINVAL;
919
920 have_band = true;
921 }
922
923 if (!have_band) {
924 WARN_ON(1);
925 return -EINVAL;
926 }
927
928 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
929 /*
930 * Validate we have a policy (can be explicitly set to
931 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
932 * we have at least one of doit/dumpit.
933 */
934 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
935 return -EINVAL;
936 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
937 !rdev->wiphy.vendor_commands[i].dumpit))
938 return -EINVAL;
939 }
940
941 #ifdef CONFIG_PM
942 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
943 (!rdev->wiphy.wowlan->pattern_min_len ||
944 rdev->wiphy.wowlan->pattern_min_len >
945 rdev->wiphy.wowlan->pattern_max_len)))
946 return -EINVAL;
947 #endif
948
949 if (!wiphy->max_num_akm_suites)
950 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
951 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
952 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
953 return -EINVAL;
954
955 /* check and set up bitrates */
956 ieee80211_set_bitrate_flags(wiphy);
957
958 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
959
960 rtnl_lock();
961 res = device_add(&rdev->wiphy.dev);
962 if (res) {
963 rtnl_unlock();
964 return res;
965 }
966
967 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
968 cfg80211_rdev_list_generation++;
969
970 /* add to debugfs */
971 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
972 ieee80211_debugfs_dir);
973
974 cfg80211_debugfs_rdev_add(rdev);
975 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
976
977 /* set up regulatory info */
978 wiphy_regulatory_register(wiphy);
979
980 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
981 struct regulatory_request request;
982
983 request.wiphy_idx = get_wiphy_idx(wiphy);
984 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
985 request.alpha2[0] = '9';
986 request.alpha2[1] = '9';
987
988 nl80211_send_reg_change_event(&request);
989 }
990
991 /* Check that nobody globally advertises any capabilities they do not
992 * advertise on all possible interface types.
993 */
994 if (wiphy->extended_capabilities_len &&
995 wiphy->num_iftype_ext_capab &&
996 wiphy->iftype_ext_capab) {
997 u8 supported_on_all, j;
998 const struct wiphy_iftype_ext_capab *capab;
999
1000 capab = wiphy->iftype_ext_capab;
1001 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1002 if (capab[0].extended_capabilities_len > j)
1003 supported_on_all =
1004 capab[0].extended_capabilities[j];
1005 else
1006 supported_on_all = 0x00;
1007 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1008 if (j >= capab[i].extended_capabilities_len) {
1009 supported_on_all = 0x00;
1010 break;
1011 }
1012 supported_on_all &=
1013 capab[i].extended_capabilities[j];
1014 }
1015 if (WARN_ON(wiphy->extended_capabilities[j] &
1016 ~supported_on_all))
1017 break;
1018 }
1019 }
1020
1021 rdev->wiphy.registered = true;
1022 rtnl_unlock();
1023
1024 res = rfkill_register(rdev->wiphy.rfkill);
1025 if (res) {
1026 rfkill_destroy(rdev->wiphy.rfkill);
1027 rdev->wiphy.rfkill = NULL;
1028 wiphy_unregister(&rdev->wiphy);
1029 return res;
1030 }
1031
1032 return 0;
1033 }
1034 EXPORT_SYMBOL(wiphy_register);
1035
wiphy_rfkill_start_polling(struct wiphy * wiphy)1036 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1037 {
1038 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1039
1040 if (!rdev->ops->rfkill_poll)
1041 return;
1042 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1043 rfkill_resume_polling(wiphy->rfkill);
1044 }
1045 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1046
cfg80211_process_wiphy_works(struct cfg80211_registered_device * rdev,struct wiphy_work * end)1047 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1048 struct wiphy_work *end)
1049 {
1050 unsigned int runaway_limit = 100;
1051 unsigned long flags;
1052
1053 lockdep_assert_held(&rdev->wiphy.mtx);
1054
1055 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1056 while (!list_empty(&rdev->wiphy_work_list)) {
1057 struct wiphy_work *wk;
1058
1059 wk = list_first_entry(&rdev->wiphy_work_list,
1060 struct wiphy_work, entry);
1061 list_del_init(&wk->entry);
1062 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1063
1064 wk->func(&rdev->wiphy, wk);
1065
1066 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1067
1068 if (wk == end)
1069 break;
1070
1071 if (WARN_ON(--runaway_limit == 0))
1072 INIT_LIST_HEAD(&rdev->wiphy_work_list);
1073 }
1074 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1075 }
1076
wiphy_unregister(struct wiphy * wiphy)1077 void wiphy_unregister(struct wiphy *wiphy)
1078 {
1079 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1080
1081 wait_event(rdev->dev_wait, ({
1082 int __count;
1083 wiphy_lock(&rdev->wiphy);
1084 __count = rdev->opencount;
1085 wiphy_unlock(&rdev->wiphy);
1086 __count == 0; }));
1087
1088 if (rdev->wiphy.rfkill)
1089 rfkill_unregister(rdev->wiphy.rfkill);
1090
1091 rtnl_lock();
1092 wiphy_lock(&rdev->wiphy);
1093 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1094 rdev->wiphy.registered = false;
1095
1096 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1097
1098 /*
1099 * First remove the hardware from everywhere, this makes
1100 * it impossible to find from userspace.
1101 */
1102 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1103 list_del_rcu(&rdev->list);
1104 synchronize_rcu();
1105
1106 /*
1107 * If this device got a regulatory hint tell core its
1108 * free to listen now to a new shiny device regulatory hint
1109 */
1110 wiphy_regulatory_deregister(wiphy);
1111
1112 cfg80211_rdev_list_generation++;
1113 device_del(&rdev->wiphy.dev);
1114
1115 #ifdef CONFIG_PM
1116 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1117 rdev_set_wakeup(rdev, false);
1118 #endif
1119
1120 /* surely nothing is reachable now, clean up work */
1121 cfg80211_process_wiphy_works(rdev, NULL);
1122 wiphy_unlock(&rdev->wiphy);
1123 rtnl_unlock();
1124
1125 /* this has nothing to do now but make sure it's gone */
1126 cancel_work_sync(&rdev->wiphy_work);
1127
1128 flush_work(&rdev->scan_done_wk);
1129 cancel_work_sync(&rdev->conn_work);
1130 flush_work(&rdev->event_work);
1131 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1132 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1133 flush_work(&rdev->destroy_work);
1134 flush_work(&rdev->sched_scan_stop_wk);
1135 flush_work(&rdev->propagate_radar_detect_wk);
1136 flush_work(&rdev->propagate_cac_done_wk);
1137 flush_work(&rdev->mgmt_registrations_update_wk);
1138 flush_work(&rdev->background_cac_abort_wk);
1139
1140 cfg80211_rdev_free_wowlan(rdev);
1141 cfg80211_rdev_free_coalesce(rdev);
1142 }
1143 EXPORT_SYMBOL(wiphy_unregister);
1144
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1145 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1146 {
1147 struct cfg80211_internal_bss *scan, *tmp;
1148 struct cfg80211_beacon_registration *reg, *treg;
1149 rfkill_destroy(rdev->wiphy.rfkill);
1150 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1151 list_del(®->list);
1152 kfree(reg);
1153 }
1154 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1155 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1156 mutex_destroy(&rdev->wiphy.mtx);
1157
1158 /*
1159 * The 'regd' can only be non-NULL if we never finished
1160 * initializing the wiphy and thus never went through the
1161 * unregister path - e.g. in failure scenarios. Thus, it
1162 * cannot have been visible to anyone if non-NULL, so we
1163 * can just free it here.
1164 */
1165 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1166
1167 kfree(rdev);
1168 }
1169
wiphy_free(struct wiphy * wiphy)1170 void wiphy_free(struct wiphy *wiphy)
1171 {
1172 put_device(&wiphy->dev);
1173 }
1174 EXPORT_SYMBOL(wiphy_free);
1175
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1176 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1177 enum rfkill_hard_block_reasons reason)
1178 {
1179 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1180
1181 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1182 schedule_work(&rdev->rfkill_block);
1183 }
1184 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1185
cfg80211_cqm_config_free(struct wireless_dev * wdev)1186 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1187 {
1188 kfree(wdev->cqm_config);
1189 wdev->cqm_config = NULL;
1190 }
1191
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1192 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1193 bool unregister_netdev)
1194 {
1195 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1196 unsigned int link_id;
1197
1198 ASSERT_RTNL();
1199 lockdep_assert_held(&rdev->wiphy.mtx);
1200
1201 flush_work(&wdev->pmsr_free_wk);
1202
1203 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1204
1205 wdev->registered = false;
1206
1207 if (wdev->netdev) {
1208 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1209 if (unregister_netdev)
1210 unregister_netdevice(wdev->netdev);
1211 }
1212
1213 list_del_rcu(&wdev->list);
1214 synchronize_net();
1215 rdev->devlist_generation++;
1216
1217 cfg80211_mlme_purge_registrations(wdev);
1218
1219 switch (wdev->iftype) {
1220 case NL80211_IFTYPE_P2P_DEVICE:
1221 cfg80211_stop_p2p_device(rdev, wdev);
1222 break;
1223 case NL80211_IFTYPE_NAN:
1224 cfg80211_stop_nan(rdev, wdev);
1225 break;
1226 default:
1227 break;
1228 }
1229
1230 #ifdef CONFIG_CFG80211_WEXT
1231 kfree_sensitive(wdev->wext.keys);
1232 wdev->wext.keys = NULL;
1233 #endif
1234 cfg80211_cqm_config_free(wdev);
1235
1236 /*
1237 * Ensure that all events have been processed and
1238 * freed.
1239 */
1240 cfg80211_process_wdev_events(wdev);
1241
1242 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1243 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1244 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1245 struct cfg80211_internal_bss *curbss;
1246
1247 curbss = wdev->links[link_id].client.current_bss;
1248
1249 if (WARN_ON(curbss)) {
1250 cfg80211_unhold_bss(curbss);
1251 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1252 wdev->links[link_id].client.current_bss = NULL;
1253 }
1254 }
1255 }
1256
1257 wdev->connected = false;
1258 }
1259
cfg80211_unregister_wdev(struct wireless_dev * wdev)1260 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1261 {
1262 _cfg80211_unregister_wdev(wdev, true);
1263 }
1264 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1265
1266 static const struct device_type wiphy_type = {
1267 .name = "wlan",
1268 };
1269
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1270 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1271 enum nl80211_iftype iftype, int num)
1272 {
1273 lockdep_assert_held(&rdev->wiphy.mtx);
1274
1275 rdev->num_running_ifaces += num;
1276 if (iftype == NL80211_IFTYPE_MONITOR)
1277 rdev->num_running_monitor_ifaces += num;
1278 }
1279
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1280 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1281 struct wireless_dev *wdev)
1282 {
1283 struct net_device *dev = wdev->netdev;
1284 struct cfg80211_sched_scan_request *pos, *tmp;
1285
1286 lockdep_assert_held(&rdev->wiphy.mtx);
1287 ASSERT_WDEV_LOCK(wdev);
1288
1289 cfg80211_pmsr_wdev_down(wdev);
1290
1291 cfg80211_stop_background_radar_detection(wdev);
1292
1293 switch (wdev->iftype) {
1294 case NL80211_IFTYPE_ADHOC:
1295 __cfg80211_leave_ibss(rdev, dev, true);
1296 break;
1297 case NL80211_IFTYPE_P2P_CLIENT:
1298 case NL80211_IFTYPE_STATION:
1299 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1300 list) {
1301 if (dev == pos->dev)
1302 cfg80211_stop_sched_scan_req(rdev, pos, false);
1303 }
1304
1305 #ifdef CONFIG_CFG80211_WEXT
1306 kfree(wdev->wext.ie);
1307 wdev->wext.ie = NULL;
1308 wdev->wext.ie_len = 0;
1309 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1310 #endif
1311 cfg80211_disconnect(rdev, dev,
1312 WLAN_REASON_DEAUTH_LEAVING, true);
1313 break;
1314 case NL80211_IFTYPE_MESH_POINT:
1315 __cfg80211_leave_mesh(rdev, dev);
1316 break;
1317 case NL80211_IFTYPE_AP:
1318 case NL80211_IFTYPE_P2P_GO:
1319 __cfg80211_stop_ap(rdev, dev, -1, true);
1320 break;
1321 case NL80211_IFTYPE_OCB:
1322 __cfg80211_leave_ocb(rdev, dev);
1323 break;
1324 case NL80211_IFTYPE_P2P_DEVICE:
1325 case NL80211_IFTYPE_NAN:
1326 /* cannot happen, has no netdev */
1327 break;
1328 case NL80211_IFTYPE_AP_VLAN:
1329 case NL80211_IFTYPE_MONITOR:
1330 /* nothing to do */
1331 break;
1332 case NL80211_IFTYPE_UNSPECIFIED:
1333 case NL80211_IFTYPE_WDS:
1334 case NUM_NL80211_IFTYPES:
1335 /* invalid */
1336 break;
1337 }
1338 }
1339
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1340 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1341 struct wireless_dev *wdev)
1342 {
1343 wdev_lock(wdev);
1344 __cfg80211_leave(rdev, wdev);
1345 wdev_unlock(wdev);
1346 }
1347
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1348 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1349 gfp_t gfp)
1350 {
1351 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1352 struct cfg80211_event *ev;
1353 unsigned long flags;
1354
1355 trace_cfg80211_stop_iface(wiphy, wdev);
1356
1357 ev = kzalloc(sizeof(*ev), gfp);
1358 if (!ev)
1359 return;
1360
1361 ev->type = EVENT_STOPPED;
1362
1363 spin_lock_irqsave(&wdev->event_lock, flags);
1364 list_add_tail(&ev->list, &wdev->event_list);
1365 spin_unlock_irqrestore(&wdev->event_lock, flags);
1366 queue_work(cfg80211_wq, &rdev->event_work);
1367 }
1368 EXPORT_SYMBOL(cfg80211_stop_iface);
1369
cfg80211_init_wdev(struct wireless_dev * wdev)1370 void cfg80211_init_wdev(struct wireless_dev *wdev)
1371 {
1372 mutex_init(&wdev->mtx);
1373 INIT_LIST_HEAD(&wdev->event_list);
1374 spin_lock_init(&wdev->event_lock);
1375 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1376 INIT_LIST_HEAD(&wdev->pmsr_list);
1377 spin_lock_init(&wdev->pmsr_lock);
1378 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1379
1380 #ifdef CONFIG_CFG80211_WEXT
1381 wdev->wext.default_key = -1;
1382 wdev->wext.default_mgmt_key = -1;
1383 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1384 #endif
1385
1386 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1387 wdev->ps = true;
1388 else
1389 wdev->ps = false;
1390 /* allow mac80211 to determine the timeout */
1391 wdev->ps_timeout = -1;
1392
1393 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1394 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1395 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1396 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1397
1398 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1399 }
1400
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1401 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1402 struct wireless_dev *wdev)
1403 {
1404 ASSERT_RTNL();
1405 lockdep_assert_held(&rdev->wiphy.mtx);
1406
1407 /*
1408 * We get here also when the interface changes network namespaces,
1409 * as it's registered into the new one, but we don't want it to
1410 * change ID in that case. Checking if the ID is already assigned
1411 * works, because 0 isn't considered a valid ID and the memory is
1412 * 0-initialized.
1413 */
1414 if (!wdev->identifier)
1415 wdev->identifier = ++rdev->wdev_id;
1416 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1417 rdev->devlist_generation++;
1418 wdev->registered = true;
1419
1420 if (wdev->netdev &&
1421 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1422 "phy80211"))
1423 pr_err("failed to add phy80211 symlink to netdev!\n");
1424
1425 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1426 }
1427
cfg80211_register_netdevice(struct net_device * dev)1428 int cfg80211_register_netdevice(struct net_device *dev)
1429 {
1430 struct wireless_dev *wdev = dev->ieee80211_ptr;
1431 struct cfg80211_registered_device *rdev;
1432 int ret;
1433
1434 ASSERT_RTNL();
1435
1436 if (WARN_ON(!wdev))
1437 return -EINVAL;
1438
1439 rdev = wiphy_to_rdev(wdev->wiphy);
1440
1441 lockdep_assert_held(&rdev->wiphy.mtx);
1442
1443 /* we'll take care of this */
1444 wdev->registered = true;
1445 wdev->registering = true;
1446 ret = register_netdevice(dev);
1447 if (ret)
1448 goto out;
1449
1450 cfg80211_register_wdev(rdev, wdev);
1451 ret = 0;
1452 out:
1453 wdev->registering = false;
1454 if (ret)
1455 wdev->registered = false;
1456 return ret;
1457 }
1458 EXPORT_SYMBOL(cfg80211_register_netdevice);
1459
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1460 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1461 unsigned long state, void *ptr)
1462 {
1463 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1464 struct wireless_dev *wdev = dev->ieee80211_ptr;
1465 struct cfg80211_registered_device *rdev;
1466 struct cfg80211_sched_scan_request *pos, *tmp;
1467
1468 if (!wdev)
1469 return NOTIFY_DONE;
1470
1471 rdev = wiphy_to_rdev(wdev->wiphy);
1472
1473 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1474
1475 switch (state) {
1476 case NETDEV_POST_INIT:
1477 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1478 wdev->netdev = dev;
1479 /* can only change netns with wiphy */
1480 dev->features |= NETIF_F_NETNS_LOCAL;
1481
1482 cfg80211_init_wdev(wdev);
1483 break;
1484 case NETDEV_REGISTER:
1485 if (!wdev->registered) {
1486 wiphy_lock(&rdev->wiphy);
1487 cfg80211_register_wdev(rdev, wdev);
1488 wiphy_unlock(&rdev->wiphy);
1489 }
1490 break;
1491 case NETDEV_UNREGISTER:
1492 /*
1493 * It is possible to get NETDEV_UNREGISTER multiple times,
1494 * so check wdev->registered.
1495 */
1496 if (wdev->registered && !wdev->registering) {
1497 wiphy_lock(&rdev->wiphy);
1498 _cfg80211_unregister_wdev(wdev, false);
1499 wiphy_unlock(&rdev->wiphy);
1500 }
1501 break;
1502 case NETDEV_GOING_DOWN:
1503 wiphy_lock(&rdev->wiphy);
1504 cfg80211_leave(rdev, wdev);
1505 cfg80211_remove_links(wdev);
1506 wiphy_unlock(&rdev->wiphy);
1507 /* since we just did cfg80211_leave() nothing to do there */
1508 cancel_work_sync(&wdev->disconnect_wk);
1509 break;
1510 case NETDEV_DOWN:
1511 wiphy_lock(&rdev->wiphy);
1512 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1513 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1514 if (WARN_ON(!rdev->scan_req->notified &&
1515 (!rdev->int_scan_req ||
1516 !rdev->int_scan_req->notified)))
1517 rdev->scan_req->info.aborted = true;
1518 ___cfg80211_scan_done(rdev, false);
1519 }
1520
1521 list_for_each_entry_safe(pos, tmp,
1522 &rdev->sched_scan_req_list, list) {
1523 if (WARN_ON(pos->dev == wdev->netdev))
1524 cfg80211_stop_sched_scan_req(rdev, pos, false);
1525 }
1526
1527 rdev->opencount--;
1528 wiphy_unlock(&rdev->wiphy);
1529 wake_up(&rdev->dev_wait);
1530 break;
1531 case NETDEV_UP:
1532 wiphy_lock(&rdev->wiphy);
1533 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1534 wdev_lock(wdev);
1535 switch (wdev->iftype) {
1536 #ifdef CONFIG_CFG80211_WEXT
1537 case NL80211_IFTYPE_ADHOC:
1538 cfg80211_ibss_wext_join(rdev, wdev);
1539 break;
1540 case NL80211_IFTYPE_STATION:
1541 cfg80211_mgd_wext_connect(rdev, wdev);
1542 break;
1543 #endif
1544 #ifdef CONFIG_MAC80211_MESH
1545 case NL80211_IFTYPE_MESH_POINT:
1546 {
1547 /* backward compat code... */
1548 struct mesh_setup setup;
1549 memcpy(&setup, &default_mesh_setup,
1550 sizeof(setup));
1551 /* back compat only needed for mesh_id */
1552 setup.mesh_id = wdev->u.mesh.id;
1553 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1554 if (wdev->u.mesh.id_up_len)
1555 __cfg80211_join_mesh(rdev, dev,
1556 &setup,
1557 &default_mesh_config);
1558 break;
1559 }
1560 #endif
1561 default:
1562 break;
1563 }
1564 wdev_unlock(wdev);
1565 rdev->opencount++;
1566
1567 /*
1568 * Configure power management to the driver here so that its
1569 * correctly set also after interface type changes etc.
1570 */
1571 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1572 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1573 rdev->ops->set_power_mgmt &&
1574 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1575 wdev->ps_timeout)) {
1576 /* assume this means it's off */
1577 wdev->ps = false;
1578 }
1579 wiphy_unlock(&rdev->wiphy);
1580 break;
1581 case NETDEV_PRE_UP:
1582 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1583 wdev->use_4addr, 0))
1584 return notifier_from_errno(-EOPNOTSUPP);
1585
1586 if (rfkill_blocked(rdev->wiphy.rfkill))
1587 return notifier_from_errno(-ERFKILL);
1588 break;
1589 default:
1590 return NOTIFY_DONE;
1591 }
1592
1593 wireless_nlevent_flush();
1594
1595 return NOTIFY_OK;
1596 }
1597
1598 static struct notifier_block cfg80211_netdev_notifier = {
1599 .notifier_call = cfg80211_netdev_notifier_call,
1600 };
1601
cfg80211_pernet_exit(struct net * net)1602 static void __net_exit cfg80211_pernet_exit(struct net *net)
1603 {
1604 struct cfg80211_registered_device *rdev;
1605
1606 rtnl_lock();
1607 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1608 if (net_eq(wiphy_net(&rdev->wiphy), net))
1609 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1610 }
1611 rtnl_unlock();
1612 }
1613
1614 static struct pernet_operations cfg80211_pernet_ops = {
1615 .exit = cfg80211_pernet_exit,
1616 };
1617
wiphy_work_queue(struct wiphy * wiphy,struct wiphy_work * work)1618 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1619 {
1620 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1621 unsigned long flags;
1622
1623 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1624 if (list_empty(&work->entry))
1625 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1626 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1627
1628 queue_work(system_unbound_wq, &rdev->wiphy_work);
1629 }
1630 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1631
wiphy_work_cancel(struct wiphy * wiphy,struct wiphy_work * work)1632 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1633 {
1634 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1635 unsigned long flags;
1636
1637 lockdep_assert_held(&wiphy->mtx);
1638
1639 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1640 if (!list_empty(&work->entry))
1641 list_del_init(&work->entry);
1642 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1643 }
1644 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1645
wiphy_work_flush(struct wiphy * wiphy,struct wiphy_work * work)1646 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1647 {
1648 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1649 unsigned long flags;
1650 bool run;
1651
1652 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1653 run = !work || !list_empty(&work->entry);
1654 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1655
1656 if (run)
1657 cfg80211_process_wiphy_works(rdev, work);
1658 }
1659 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1660
wiphy_delayed_work_timer(struct timer_list * t)1661 void wiphy_delayed_work_timer(struct timer_list *t)
1662 {
1663 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1664
1665 wiphy_work_queue(dwork->wiphy, &dwork->work);
1666 }
1667 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1668
wiphy_delayed_work_queue(struct wiphy * wiphy,struct wiphy_delayed_work * dwork,unsigned long delay)1669 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1670 struct wiphy_delayed_work *dwork,
1671 unsigned long delay)
1672 {
1673 if (!delay) {
1674 del_timer(&dwork->timer);
1675 wiphy_work_queue(wiphy, &dwork->work);
1676 return;
1677 }
1678
1679 dwork->wiphy = wiphy;
1680 mod_timer(&dwork->timer, jiffies + delay);
1681 }
1682 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1683
wiphy_delayed_work_cancel(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1684 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1685 struct wiphy_delayed_work *dwork)
1686 {
1687 lockdep_assert_held(&wiphy->mtx);
1688
1689 del_timer_sync(&dwork->timer);
1690 wiphy_work_cancel(wiphy, &dwork->work);
1691 }
1692 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1693
wiphy_delayed_work_flush(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1694 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1695 struct wiphy_delayed_work *dwork)
1696 {
1697 lockdep_assert_held(&wiphy->mtx);
1698
1699 del_timer_sync(&dwork->timer);
1700 wiphy_work_flush(wiphy, &dwork->work);
1701 }
1702 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1703
cfg80211_init(void)1704 static int __init cfg80211_init(void)
1705 {
1706 int err;
1707
1708 err = register_pernet_device(&cfg80211_pernet_ops);
1709 if (err)
1710 goto out_fail_pernet;
1711
1712 err = wiphy_sysfs_init();
1713 if (err)
1714 goto out_fail_sysfs;
1715
1716 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1717 if (err)
1718 goto out_fail_notifier;
1719
1720 err = nl80211_init();
1721 if (err)
1722 goto out_fail_nl80211;
1723
1724 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1725
1726 err = regulatory_init();
1727 if (err)
1728 goto out_fail_reg;
1729
1730 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1731 if (!cfg80211_wq) {
1732 err = -ENOMEM;
1733 goto out_fail_wq;
1734 }
1735
1736 return 0;
1737
1738 out_fail_wq:
1739 regulatory_exit();
1740 out_fail_reg:
1741 debugfs_remove(ieee80211_debugfs_dir);
1742 nl80211_exit();
1743 out_fail_nl80211:
1744 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1745 out_fail_notifier:
1746 wiphy_sysfs_exit();
1747 out_fail_sysfs:
1748 unregister_pernet_device(&cfg80211_pernet_ops);
1749 out_fail_pernet:
1750 return err;
1751 }
1752 fs_initcall(cfg80211_init);
1753
cfg80211_exit(void)1754 static void __exit cfg80211_exit(void)
1755 {
1756 debugfs_remove(ieee80211_debugfs_dir);
1757 nl80211_exit();
1758 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1759 wiphy_sysfs_exit();
1760 regulatory_exit();
1761 unregister_pernet_device(&cfg80211_pernet_ops);
1762 destroy_workqueue(cfg80211_wq);
1763 }
1764 module_exit(cfg80211_exit);
1765