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 lockdep_assert_wiphy(&rdev->wiphy);
133
134 /* Ignore nop renames */
135 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
136 return 0;
137
138 result = cfg80211_dev_check_name(rdev, newname);
139 if (result < 0)
140 return result;
141
142 result = device_rename(&rdev->wiphy.dev, newname);
143 if (result)
144 return result;
145
146 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
147 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
148 rdev->wiphy.debugfsdir,
149 rdev->wiphy.debugfsdir->d_parent, newname);
150
151 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
152
153 return 0;
154 }
155
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
157 struct net *net)
158 {
159 struct wireless_dev *wdev;
160 int err = 0;
161
162 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
163 return -EOPNOTSUPP;
164
165 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
166 if (!wdev->netdev)
167 continue;
168 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
170 if (err)
171 break;
172 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
173 }
174
175 if (err) {
176 /* failed -- clean up to old netns */
177 net = wiphy_net(&rdev->wiphy);
178
179 list_for_each_entry_continue_reverse(wdev,
180 &rdev->wiphy.wdev_list,
181 list) {
182 if (!wdev->netdev)
183 continue;
184 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
185 err = dev_change_net_namespace(wdev->netdev, net,
186 "wlan%d");
187 WARN_ON(err);
188 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
189 }
190
191 return err;
192 }
193
194 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
195 if (!wdev->netdev)
196 continue;
197 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
198 }
199
200 wiphy_lock(&rdev->wiphy);
201 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
202
203 wiphy_net_set(&rdev->wiphy, net);
204
205 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
206 WARN_ON(err);
207
208 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
209 wiphy_unlock(&rdev->wiphy);
210
211 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
212 if (!wdev->netdev)
213 continue;
214 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
215 }
216
217 return 0;
218 }
219
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
221 {
222 struct cfg80211_registered_device *rdev = data;
223
224 rdev_rfkill_poll(rdev);
225 }
226
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)227 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
228 struct wireless_dev *wdev)
229 {
230 lockdep_assert_held(&rdev->wiphy.mtx);
231
232 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
233 return;
234
235 if (!wdev_running(wdev))
236 return;
237
238 rdev_stop_p2p_device(rdev, wdev);
239 wdev->is_running = false;
240
241 rdev->opencount--;
242
243 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
244 if (WARN_ON(!rdev->scan_req->notified &&
245 (!rdev->int_scan_req ||
246 !rdev->int_scan_req->notified)))
247 rdev->scan_req->info.aborted = true;
248 ___cfg80211_scan_done(rdev, false);
249 }
250 }
251
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)252 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
253 struct wireless_dev *wdev)
254 {
255 lockdep_assert_held(&rdev->wiphy.mtx);
256
257 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
258 return;
259
260 if (!wdev_running(wdev))
261 return;
262
263 rdev_stop_nan(rdev, wdev);
264 wdev->is_running = false;
265
266 rdev->opencount--;
267 }
268
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)269 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
270 {
271 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
272 struct wireless_dev *wdev;
273
274 ASSERT_RTNL();
275
276 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
277 if (wdev->netdev) {
278 dev_close(wdev->netdev);
279 continue;
280 }
281
282 /* otherwise, check iftype */
283
284 wiphy_lock(wiphy);
285
286 switch (wdev->iftype) {
287 case NL80211_IFTYPE_P2P_DEVICE:
288 cfg80211_stop_p2p_device(rdev, wdev);
289 break;
290 case NL80211_IFTYPE_NAN:
291 cfg80211_stop_nan(rdev, wdev);
292 break;
293 default:
294 break;
295 }
296
297 wiphy_unlock(wiphy);
298 }
299 }
300 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
301
cfg80211_rfkill_set_block(void * data,bool blocked)302 static int cfg80211_rfkill_set_block(void *data, bool blocked)
303 {
304 struct cfg80211_registered_device *rdev = data;
305
306 if (!blocked)
307 return 0;
308
309 rtnl_lock();
310 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
311 rtnl_unlock();
312
313 return 0;
314 }
315
cfg80211_rfkill_block_work(struct work_struct * work)316 static void cfg80211_rfkill_block_work(struct work_struct *work)
317 {
318 struct cfg80211_registered_device *rdev;
319
320 rdev = container_of(work, struct cfg80211_registered_device,
321 rfkill_block);
322 cfg80211_rfkill_set_block(rdev, true);
323 }
324
cfg80211_event_work(struct work_struct * work)325 static void cfg80211_event_work(struct work_struct *work)
326 {
327 struct cfg80211_registered_device *rdev;
328
329 rdev = container_of(work, struct cfg80211_registered_device,
330 event_work);
331
332 wiphy_lock(&rdev->wiphy);
333 cfg80211_process_rdev_events(rdev);
334 wiphy_unlock(&rdev->wiphy);
335 }
336
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)337 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
338 {
339 struct wireless_dev *wdev, *tmp;
340
341 ASSERT_RTNL();
342
343 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
344 if (wdev->nl_owner_dead) {
345 if (wdev->netdev)
346 dev_close(wdev->netdev);
347
348 wiphy_lock(&rdev->wiphy);
349 cfg80211_leave(rdev, wdev);
350 cfg80211_remove_virtual_intf(rdev, wdev);
351 wiphy_unlock(&rdev->wiphy);
352 }
353 }
354 }
355
cfg80211_destroy_iface_wk(struct work_struct * work)356 static void cfg80211_destroy_iface_wk(struct work_struct *work)
357 {
358 struct cfg80211_registered_device *rdev;
359
360 rdev = container_of(work, struct cfg80211_registered_device,
361 destroy_work);
362
363 rtnl_lock();
364 cfg80211_destroy_ifaces(rdev);
365 rtnl_unlock();
366 }
367
cfg80211_sched_scan_stop_wk(struct wiphy * wiphy,struct wiphy_work * work)368 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
369 struct wiphy_work *work)
370 {
371 struct cfg80211_registered_device *rdev;
372 struct cfg80211_sched_scan_request *req, *tmp;
373
374 rdev = container_of(work, struct cfg80211_registered_device,
375 sched_scan_stop_wk);
376
377 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
378 if (req->nl_owner_dead)
379 cfg80211_stop_sched_scan_req(rdev, req, false);
380 }
381 }
382
cfg80211_propagate_radar_detect_wk(struct work_struct * work)383 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
384 {
385 struct cfg80211_registered_device *rdev;
386
387 rdev = container_of(work, struct cfg80211_registered_device,
388 propagate_radar_detect_wk);
389
390 rtnl_lock();
391
392 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
393 NL80211_DFS_UNAVAILABLE,
394 NL80211_RADAR_DETECTED);
395
396 rtnl_unlock();
397 }
398
cfg80211_propagate_cac_done_wk(struct work_struct * work)399 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
400 {
401 struct cfg80211_registered_device *rdev;
402
403 rdev = container_of(work, struct cfg80211_registered_device,
404 propagate_cac_done_wk);
405
406 rtnl_lock();
407
408 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
409 NL80211_DFS_AVAILABLE,
410 NL80211_RADAR_CAC_FINISHED);
411
412 rtnl_unlock();
413 }
414
cfg80211_wiphy_work(struct work_struct * work)415 static void cfg80211_wiphy_work(struct work_struct *work)
416 {
417 struct cfg80211_registered_device *rdev;
418 struct wiphy_work *wk;
419
420 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
421
422 wiphy_lock(&rdev->wiphy);
423 if (rdev->suspended)
424 goto out;
425
426 spin_lock_irq(&rdev->wiphy_work_lock);
427 wk = list_first_entry_or_null(&rdev->wiphy_work_list,
428 struct wiphy_work, entry);
429 if (wk) {
430 list_del_init(&wk->entry);
431 if (!list_empty(&rdev->wiphy_work_list))
432 schedule_work(work);
433 spin_unlock_irq(&rdev->wiphy_work_lock);
434
435 wk->func(&rdev->wiphy, wk);
436 } else {
437 spin_unlock_irq(&rdev->wiphy_work_lock);
438 }
439 out:
440 wiphy_unlock(&rdev->wiphy);
441 }
442
443 /* exported functions */
444
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)445 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
446 const char *requested_name)
447 {
448 static atomic_t wiphy_counter = ATOMIC_INIT(0);
449
450 struct cfg80211_registered_device *rdev;
451 int alloc_size;
452
453 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
454 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
455 WARN_ON(ops->connect && !ops->disconnect);
456 WARN_ON(ops->join_ibss && !ops->leave_ibss);
457 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
458 WARN_ON(ops->add_station && !ops->del_station);
459 WARN_ON(ops->add_mpath && !ops->del_mpath);
460 WARN_ON(ops->join_mesh && !ops->leave_mesh);
461 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
462 WARN_ON(ops->start_ap && !ops->stop_ap);
463 WARN_ON(ops->join_ocb && !ops->leave_ocb);
464 WARN_ON(ops->suspend && !ops->resume);
465 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
466 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
467 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
468 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
469
470 alloc_size = sizeof(*rdev) + sizeof_priv;
471
472 rdev = kzalloc(alloc_size, GFP_KERNEL);
473 if (!rdev)
474 return NULL;
475
476 rdev->ops = ops;
477
478 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
479
480 if (unlikely(rdev->wiphy_idx < 0)) {
481 /* ugh, wrapped! */
482 atomic_dec(&wiphy_counter);
483 kfree(rdev);
484 return NULL;
485 }
486
487 /* atomic_inc_return makes it start at 1, make it start at 0 */
488 rdev->wiphy_idx--;
489
490 /* give it a proper name */
491 if (requested_name && requested_name[0]) {
492 int rv;
493
494 rtnl_lock();
495 rv = cfg80211_dev_check_name(rdev, requested_name);
496
497 if (rv < 0) {
498 rtnl_unlock();
499 goto use_default_name;
500 }
501
502 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
503 rtnl_unlock();
504 if (rv)
505 goto use_default_name;
506 } else {
507 int rv;
508
509 use_default_name:
510 /* NOTE: This is *probably* safe w/out holding rtnl because of
511 * the restrictions on phy names. Probably this call could
512 * fail if some other part of the kernel (re)named a device
513 * phyX. But, might should add some locking and check return
514 * value, and use a different name if this one exists?
515 */
516 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
517 if (rv < 0) {
518 kfree(rdev);
519 return NULL;
520 }
521 }
522
523 mutex_init(&rdev->wiphy.mtx);
524 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
525 INIT_LIST_HEAD(&rdev->beacon_registrations);
526 spin_lock_init(&rdev->beacon_registrations_lock);
527 spin_lock_init(&rdev->bss_lock);
528 INIT_LIST_HEAD(&rdev->bss_list);
529 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
530 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
531 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
532 cfg80211_dfs_channels_update_work);
533 #ifdef CONFIG_CFG80211_WEXT
534 rdev->wiphy.wext = &cfg80211_wext_handler;
535 #endif
536
537 device_initialize(&rdev->wiphy.dev);
538 rdev->wiphy.dev.class = &ieee80211_class;
539 rdev->wiphy.dev.platform_data = rdev;
540 device_enable_async_suspend(&rdev->wiphy.dev);
541
542 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
543 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
544 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
545 INIT_WORK(&rdev->propagate_radar_detect_wk,
546 cfg80211_propagate_radar_detect_wk);
547 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
548 INIT_WORK(&rdev->mgmt_registrations_update_wk,
549 cfg80211_mgmt_registrations_update_wk);
550 spin_lock_init(&rdev->mgmt_registrations_lock);
551
552 #ifdef CONFIG_CFG80211_DEFAULT_PS
553 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
554 #endif
555
556 wiphy_net_set(&rdev->wiphy, &init_net);
557
558 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
559 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
560 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
561 &rdev->rfkill_ops, rdev);
562
563 if (!rdev->wiphy.rfkill) {
564 wiphy_free(&rdev->wiphy);
565 return NULL;
566 }
567
568 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
569 INIT_LIST_HEAD(&rdev->wiphy_work_list);
570 spin_lock_init(&rdev->wiphy_work_lock);
571 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
572 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
573 INIT_WORK(&rdev->event_work, cfg80211_event_work);
574 INIT_WORK(&rdev->background_cac_abort_wk,
575 cfg80211_background_cac_abort_wk);
576 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
577 cfg80211_background_cac_done_wk);
578
579 init_waitqueue_head(&rdev->dev_wait);
580
581 /*
582 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
583 * Fragmentation and RTS threshold are disabled by default with the
584 * special -1 value.
585 */
586 rdev->wiphy.retry_short = 7;
587 rdev->wiphy.retry_long = 4;
588 rdev->wiphy.frag_threshold = (u32) -1;
589 rdev->wiphy.rts_threshold = (u32) -1;
590 rdev->wiphy.coverage_class = 0;
591
592 rdev->wiphy.max_num_csa_counters = 1;
593
594 rdev->wiphy.max_sched_scan_plans = 1;
595 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
596
597 return &rdev->wiphy;
598 }
599 EXPORT_SYMBOL(wiphy_new_nm);
600
wiphy_verify_combinations(struct wiphy * wiphy)601 static int wiphy_verify_combinations(struct wiphy *wiphy)
602 {
603 const struct ieee80211_iface_combination *c;
604 int i, j;
605
606 for (i = 0; i < wiphy->n_iface_combinations; i++) {
607 u32 cnt = 0;
608 u16 all_iftypes = 0;
609
610 c = &wiphy->iface_combinations[i];
611
612 /*
613 * Combinations with just one interface aren't real,
614 * however we make an exception for DFS.
615 */
616 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
617 return -EINVAL;
618
619 /* Need at least one channel */
620 if (WARN_ON(!c->num_different_channels))
621 return -EINVAL;
622
623 /* DFS only works on one channel. */
624 if (WARN_ON(c->radar_detect_widths &&
625 (c->num_different_channels > 1)))
626 return -EINVAL;
627
628 if (WARN_ON(!c->n_limits))
629 return -EINVAL;
630
631 for (j = 0; j < c->n_limits; j++) {
632 u16 types = c->limits[j].types;
633
634 /* interface types shouldn't overlap */
635 if (WARN_ON(types & all_iftypes))
636 return -EINVAL;
637 all_iftypes |= types;
638
639 if (WARN_ON(!c->limits[j].max))
640 return -EINVAL;
641
642 /* Shouldn't list software iftypes in combinations! */
643 if (WARN_ON(wiphy->software_iftypes & types))
644 return -EINVAL;
645
646 /* Only a single P2P_DEVICE can be allowed */
647 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
648 c->limits[j].max > 1))
649 return -EINVAL;
650
651 /* Only a single NAN can be allowed */
652 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
653 c->limits[j].max > 1))
654 return -EINVAL;
655
656 /*
657 * This isn't well-defined right now. If you have an
658 * IBSS interface, then its beacon interval may change
659 * by joining other networks, and nothing prevents it
660 * from doing that.
661 * So technically we probably shouldn't even allow AP
662 * and IBSS in the same interface, but it seems that
663 * some drivers support that, possibly only with fixed
664 * beacon intervals for IBSS.
665 */
666 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
667 c->beacon_int_min_gcd)) {
668 return -EINVAL;
669 }
670
671 cnt += c->limits[j].max;
672 /*
673 * Don't advertise an unsupported type
674 * in a combination.
675 */
676 if (WARN_ON((wiphy->interface_modes & types) != types))
677 return -EINVAL;
678 }
679
680 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
681 return -EINVAL;
682
683 /* You can't even choose that many! */
684 if (WARN_ON(cnt < c->max_interfaces))
685 return -EINVAL;
686 }
687
688 return 0;
689 }
690
wiphy_register(struct wiphy * wiphy)691 int wiphy_register(struct wiphy *wiphy)
692 {
693 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
694 int res;
695 enum nl80211_band band;
696 struct ieee80211_supported_band *sband;
697 bool have_band = false;
698 int i;
699 u16 ifmodes = wiphy->interface_modes;
700
701 #ifdef CONFIG_PM
702 if (WARN_ON(wiphy->wowlan &&
703 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
704 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
705 return -EINVAL;
706 if (WARN_ON(wiphy->wowlan &&
707 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
708 !wiphy->wowlan->tcp))
709 return -EINVAL;
710 #endif
711 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
712 (!rdev->ops->tdls_channel_switch ||
713 !rdev->ops->tdls_cancel_channel_switch)))
714 return -EINVAL;
715
716 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
717 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
718 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
719 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
720 return -EINVAL;
721
722 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
723 return -EINVAL;
724
725 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
726 return -EINVAL;
727
728 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
729 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
730 !wiphy->pmsr_capa->ftm.non_asap))
731 return -EINVAL;
732 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
733 !wiphy->pmsr_capa->ftm.bandwidths))
734 return -EINVAL;
735 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
736 ~(BIT(NL80211_PREAMBLE_LEGACY) |
737 BIT(NL80211_PREAMBLE_HT) |
738 BIT(NL80211_PREAMBLE_VHT) |
739 BIT(NL80211_PREAMBLE_HE) |
740 BIT(NL80211_PREAMBLE_DMG))))
741 return -EINVAL;
742 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
743 wiphy->pmsr_capa->ftm.non_trigger_based) &&
744 !(wiphy->pmsr_capa->ftm.preambles &
745 BIT(NL80211_PREAMBLE_HE))))
746 return -EINVAL;
747 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
748 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
749 BIT(NL80211_CHAN_WIDTH_20) |
750 BIT(NL80211_CHAN_WIDTH_40) |
751 BIT(NL80211_CHAN_WIDTH_80) |
752 BIT(NL80211_CHAN_WIDTH_80P80) |
753 BIT(NL80211_CHAN_WIDTH_160) |
754 BIT(NL80211_CHAN_WIDTH_5) |
755 BIT(NL80211_CHAN_WIDTH_10))))
756 return -EINVAL;
757 }
758
759 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
760 (wiphy->regulatory_flags &
761 (REGULATORY_CUSTOM_REG |
762 REGULATORY_STRICT_REG |
763 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
764 REGULATORY_COUNTRY_IE_IGNORE))))
765 return -EINVAL;
766
767 if (WARN_ON(wiphy->coalesce &&
768 (!wiphy->coalesce->n_rules ||
769 !wiphy->coalesce->n_patterns) &&
770 (!wiphy->coalesce->pattern_min_len ||
771 wiphy->coalesce->pattern_min_len >
772 wiphy->coalesce->pattern_max_len)))
773 return -EINVAL;
774
775 if (WARN_ON(wiphy->ap_sme_capa &&
776 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
777 return -EINVAL;
778
779 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
780 return -EINVAL;
781
782 if (WARN_ON(wiphy->addresses &&
783 !is_zero_ether_addr(wiphy->perm_addr) &&
784 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
785 ETH_ALEN)))
786 return -EINVAL;
787
788 if (WARN_ON(wiphy->max_acl_mac_addrs &&
789 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
790 !rdev->ops->set_mac_acl)))
791 return -EINVAL;
792
793 /* assure only valid behaviours are flagged by driver
794 * hence subtract 2 as bit 0 is invalid.
795 */
796 if (WARN_ON(wiphy->bss_select_support &&
797 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
798 return -EINVAL;
799
800 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
801 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
802 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
803 return -EINVAL;
804
805 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
806 rdev->ops->update_connect_params))
807 return -EINVAL;
808
809 if (wiphy->addresses)
810 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
811
812 /* sanity check ifmodes */
813 WARN_ON(!ifmodes);
814 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
815 if (WARN_ON(ifmodes != wiphy->interface_modes))
816 wiphy->interface_modes = ifmodes;
817
818 res = wiphy_verify_combinations(wiphy);
819 if (res)
820 return res;
821
822 /* sanity check supported bands/channels */
823 for (band = 0; band < NUM_NL80211_BANDS; band++) {
824 u16 types = 0;
825 bool have_he = false;
826
827 sband = wiphy->bands[band];
828 if (!sband)
829 continue;
830
831 sband->band = band;
832 if (WARN_ON(!sband->n_channels))
833 return -EINVAL;
834 /*
835 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
836 * n_bitrates is 0
837 */
838 if (WARN_ON((band != NL80211_BAND_60GHZ &&
839 band != NL80211_BAND_S1GHZ) &&
840 !sband->n_bitrates))
841 return -EINVAL;
842
843 if (WARN_ON(band == NL80211_BAND_6GHZ &&
844 (sband->ht_cap.ht_supported ||
845 sband->vht_cap.vht_supported)))
846 return -EINVAL;
847
848 /*
849 * Since cfg80211_disable_40mhz_24ghz is global, we can
850 * modify the sband's ht data even if the driver uses a
851 * global structure for that.
852 */
853 if (cfg80211_disable_40mhz_24ghz &&
854 band == NL80211_BAND_2GHZ &&
855 sband->ht_cap.ht_supported) {
856 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
857 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
858 }
859
860 /*
861 * Since we use a u32 for rate bitmaps in
862 * ieee80211_get_response_rate, we cannot
863 * have more than 32 legacy rates.
864 */
865 if (WARN_ON(sband->n_bitrates > 32))
866 return -EINVAL;
867
868 for (i = 0; i < sband->n_channels; i++) {
869 sband->channels[i].orig_flags =
870 sband->channels[i].flags;
871 sband->channels[i].orig_mag = INT_MAX;
872 sband->channels[i].orig_mpwr =
873 sband->channels[i].max_power;
874 sband->channels[i].band = band;
875
876 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
877 return -EINVAL;
878 }
879
880 for (i = 0; i < sband->n_iftype_data; i++) {
881 const struct ieee80211_sband_iftype_data *iftd;
882 bool has_ap, has_non_ap;
883 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
884 BIT(NL80211_IFTYPE_P2P_GO);
885
886 iftd = &sband->iftype_data[i];
887
888 if (WARN_ON(!iftd->types_mask))
889 return -EINVAL;
890 if (WARN_ON(types & iftd->types_mask))
891 return -EINVAL;
892
893 /* at least one piece of information must be present */
894 if (WARN_ON(!iftd->he_cap.has_he))
895 return -EINVAL;
896
897 types |= iftd->types_mask;
898
899 if (i == 0)
900 have_he = iftd->he_cap.has_he;
901 else
902 have_he = have_he &&
903 iftd->he_cap.has_he;
904
905 has_ap = iftd->types_mask & ap_bits;
906 has_non_ap = iftd->types_mask & ~ap_bits;
907
908 /*
909 * For EHT 20 MHz STA, the capabilities format differs
910 * but to simplify, don't check 20 MHz but rather check
911 * only if AP and non-AP were mentioned at the same time,
912 * reject if so.
913 */
914 if (WARN_ON(iftd->eht_cap.has_eht &&
915 has_ap && has_non_ap))
916 return -EINVAL;
917 }
918
919 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
920 return -EINVAL;
921
922 have_band = true;
923 }
924
925 if (!have_band) {
926 WARN_ON(1);
927 return -EINVAL;
928 }
929
930 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
931 /*
932 * Validate we have a policy (can be explicitly set to
933 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
934 * we have at least one of doit/dumpit.
935 */
936 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
937 return -EINVAL;
938 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
939 !rdev->wiphy.vendor_commands[i].dumpit))
940 return -EINVAL;
941 }
942
943 #ifdef CONFIG_PM
944 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
945 (!rdev->wiphy.wowlan->pattern_min_len ||
946 rdev->wiphy.wowlan->pattern_min_len >
947 rdev->wiphy.wowlan->pattern_max_len)))
948 return -EINVAL;
949 #endif
950
951 if (!wiphy->max_num_akm_suites)
952 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
953 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
954 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
955 return -EINVAL;
956
957 /* check and set up bitrates */
958 ieee80211_set_bitrate_flags(wiphy);
959
960 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
961
962 rtnl_lock();
963 wiphy_lock(&rdev->wiphy);
964 res = device_add(&rdev->wiphy.dev);
965 if (res) {
966 wiphy_unlock(&rdev->wiphy);
967 rtnl_unlock();
968 return res;
969 }
970
971 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
972 cfg80211_rdev_list_generation++;
973
974 /* add to debugfs */
975 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
976 ieee80211_debugfs_dir);
977
978 cfg80211_debugfs_rdev_add(rdev);
979 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
980 wiphy_unlock(&rdev->wiphy);
981
982 /* set up regulatory info */
983 wiphy_regulatory_register(wiphy);
984
985 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
986 struct regulatory_request request;
987
988 request.wiphy_idx = get_wiphy_idx(wiphy);
989 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
990 request.alpha2[0] = '9';
991 request.alpha2[1] = '9';
992
993 nl80211_send_reg_change_event(&request);
994 }
995
996 /* Check that nobody globally advertises any capabilities they do not
997 * advertise on all possible interface types.
998 */
999 if (wiphy->extended_capabilities_len &&
1000 wiphy->num_iftype_ext_capab &&
1001 wiphy->iftype_ext_capab) {
1002 u8 supported_on_all, j;
1003 const struct wiphy_iftype_ext_capab *capab;
1004
1005 capab = wiphy->iftype_ext_capab;
1006 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1007 if (capab[0].extended_capabilities_len > j)
1008 supported_on_all =
1009 capab[0].extended_capabilities[j];
1010 else
1011 supported_on_all = 0x00;
1012 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1013 if (j >= capab[i].extended_capabilities_len) {
1014 supported_on_all = 0x00;
1015 break;
1016 }
1017 supported_on_all &=
1018 capab[i].extended_capabilities[j];
1019 }
1020 if (WARN_ON(wiphy->extended_capabilities[j] &
1021 ~supported_on_all))
1022 break;
1023 }
1024 }
1025
1026 rdev->wiphy.registered = true;
1027 rtnl_unlock();
1028
1029 res = rfkill_register(rdev->wiphy.rfkill);
1030 if (res) {
1031 rfkill_destroy(rdev->wiphy.rfkill);
1032 rdev->wiphy.rfkill = NULL;
1033 wiphy_unregister(&rdev->wiphy);
1034 return res;
1035 }
1036
1037 return 0;
1038 }
1039 EXPORT_SYMBOL(wiphy_register);
1040
wiphy_rfkill_start_polling(struct wiphy * wiphy)1041 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1042 {
1043 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1044
1045 if (!rdev->ops->rfkill_poll)
1046 return;
1047 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1048 rfkill_resume_polling(wiphy->rfkill);
1049 }
1050 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1051
cfg80211_process_wiphy_works(struct cfg80211_registered_device * rdev)1052 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev)
1053 {
1054 unsigned int runaway_limit = 100;
1055 unsigned long flags;
1056
1057 lockdep_assert_held(&rdev->wiphy.mtx);
1058
1059 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1060 while (!list_empty(&rdev->wiphy_work_list)) {
1061 struct wiphy_work *wk;
1062
1063 wk = list_first_entry(&rdev->wiphy_work_list,
1064 struct wiphy_work, entry);
1065 list_del_init(&wk->entry);
1066 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1067
1068 wk->func(&rdev->wiphy, wk);
1069
1070 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
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);
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 cancel_work_sync(&rdev->conn_work);
1129 flush_work(&rdev->event_work);
1130 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1131 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1132 flush_work(&rdev->destroy_work);
1133 flush_work(&rdev->propagate_radar_detect_wk);
1134 flush_work(&rdev->propagate_cac_done_wk);
1135 flush_work(&rdev->mgmt_registrations_update_wk);
1136 flush_work(&rdev->background_cac_abort_wk);
1137
1138 cfg80211_rdev_free_wowlan(rdev);
1139 cfg80211_rdev_free_coalesce(rdev);
1140 }
1141 EXPORT_SYMBOL(wiphy_unregister);
1142
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1143 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1144 {
1145 struct cfg80211_internal_bss *scan, *tmp;
1146 struct cfg80211_beacon_registration *reg, *treg;
1147 rfkill_destroy(rdev->wiphy.rfkill);
1148 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1149 list_del(®->list);
1150 kfree(reg);
1151 }
1152 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1153 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1154 mutex_destroy(&rdev->wiphy.mtx);
1155
1156 /*
1157 * The 'regd' can only be non-NULL if we never finished
1158 * initializing the wiphy and thus never went through the
1159 * unregister path - e.g. in failure scenarios. Thus, it
1160 * cannot have been visible to anyone if non-NULL, so we
1161 * can just free it here.
1162 */
1163 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1164
1165 kfree(rdev);
1166 }
1167
wiphy_free(struct wiphy * wiphy)1168 void wiphy_free(struct wiphy *wiphy)
1169 {
1170 put_device(&wiphy->dev);
1171 }
1172 EXPORT_SYMBOL(wiphy_free);
1173
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1174 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1175 enum rfkill_hard_block_reasons reason)
1176 {
1177 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1178
1179 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1180 schedule_work(&rdev->rfkill_block);
1181 }
1182 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1183
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1184 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1185 bool unregister_netdev)
1186 {
1187 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1188 struct cfg80211_cqm_config *cqm_config;
1189 unsigned int link_id;
1190
1191 ASSERT_RTNL();
1192 lockdep_assert_held(&rdev->wiphy.mtx);
1193
1194 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1195
1196 wdev->registered = false;
1197
1198 if (wdev->netdev) {
1199 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1200 if (unregister_netdev)
1201 unregister_netdevice(wdev->netdev);
1202 }
1203
1204 list_del_rcu(&wdev->list);
1205 synchronize_net();
1206 rdev->devlist_generation++;
1207
1208 cfg80211_mlme_purge_registrations(wdev);
1209
1210 switch (wdev->iftype) {
1211 case NL80211_IFTYPE_P2P_DEVICE:
1212 cfg80211_stop_p2p_device(rdev, wdev);
1213 break;
1214 case NL80211_IFTYPE_NAN:
1215 cfg80211_stop_nan(rdev, wdev);
1216 break;
1217 default:
1218 break;
1219 }
1220
1221 #ifdef CONFIG_CFG80211_WEXT
1222 kfree_sensitive(wdev->wext.keys);
1223 wdev->wext.keys = NULL;
1224 #endif
1225 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1226 /* deleted from the list, so can't be found from nl80211 any more */
1227 cqm_config = rcu_access_pointer(wdev->cqm_config);
1228 kfree_rcu(cqm_config, rcu_head);
1229
1230 /*
1231 * Ensure that all events have been processed and
1232 * freed.
1233 */
1234 cfg80211_process_wdev_events(wdev);
1235
1236 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1237 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1238 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1239 struct cfg80211_internal_bss *curbss;
1240
1241 curbss = wdev->links[link_id].client.current_bss;
1242
1243 if (WARN_ON(curbss)) {
1244 cfg80211_unhold_bss(curbss);
1245 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1246 wdev->links[link_id].client.current_bss = NULL;
1247 }
1248 }
1249 }
1250
1251 wdev->connected = false;
1252 }
1253
cfg80211_unregister_wdev(struct wireless_dev * wdev)1254 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1255 {
1256 _cfg80211_unregister_wdev(wdev, true);
1257 }
1258 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1259
1260 static const struct device_type wiphy_type = {
1261 .name = "wlan",
1262 };
1263
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1264 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1265 enum nl80211_iftype iftype, int num)
1266 {
1267 lockdep_assert_held(&rdev->wiphy.mtx);
1268
1269 rdev->num_running_ifaces += num;
1270 if (iftype == NL80211_IFTYPE_MONITOR)
1271 rdev->num_running_monitor_ifaces += num;
1272 }
1273
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1274 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1275 struct wireless_dev *wdev)
1276 {
1277 struct net_device *dev = wdev->netdev;
1278 struct cfg80211_sched_scan_request *pos, *tmp;
1279
1280 lockdep_assert_held(&rdev->wiphy.mtx);
1281 ASSERT_WDEV_LOCK(wdev);
1282
1283 cfg80211_pmsr_wdev_down(wdev);
1284
1285 cfg80211_stop_background_radar_detection(wdev);
1286
1287 switch (wdev->iftype) {
1288 case NL80211_IFTYPE_ADHOC:
1289 __cfg80211_leave_ibss(rdev, dev, true);
1290 break;
1291 case NL80211_IFTYPE_P2P_CLIENT:
1292 case NL80211_IFTYPE_STATION:
1293 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1294 list) {
1295 if (dev == pos->dev)
1296 cfg80211_stop_sched_scan_req(rdev, pos, false);
1297 }
1298
1299 #ifdef CONFIG_CFG80211_WEXT
1300 kfree(wdev->wext.ie);
1301 wdev->wext.ie = NULL;
1302 wdev->wext.ie_len = 0;
1303 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1304 #endif
1305 cfg80211_disconnect(rdev, dev,
1306 WLAN_REASON_DEAUTH_LEAVING, true);
1307 break;
1308 case NL80211_IFTYPE_MESH_POINT:
1309 __cfg80211_leave_mesh(rdev, dev);
1310 break;
1311 case NL80211_IFTYPE_AP:
1312 case NL80211_IFTYPE_P2P_GO:
1313 __cfg80211_stop_ap(rdev, dev, -1, true);
1314 break;
1315 case NL80211_IFTYPE_OCB:
1316 __cfg80211_leave_ocb(rdev, dev);
1317 break;
1318 case NL80211_IFTYPE_P2P_DEVICE:
1319 case NL80211_IFTYPE_NAN:
1320 /* cannot happen, has no netdev */
1321 break;
1322 case NL80211_IFTYPE_AP_VLAN:
1323 case NL80211_IFTYPE_MONITOR:
1324 /* nothing to do */
1325 break;
1326 case NL80211_IFTYPE_UNSPECIFIED:
1327 case NL80211_IFTYPE_WDS:
1328 case NUM_NL80211_IFTYPES:
1329 /* invalid */
1330 break;
1331 }
1332 }
1333
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1334 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1335 struct wireless_dev *wdev)
1336 {
1337 wdev_lock(wdev);
1338 __cfg80211_leave(rdev, wdev);
1339 wdev_unlock(wdev);
1340 }
1341
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1342 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1343 gfp_t gfp)
1344 {
1345 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1346 struct cfg80211_event *ev;
1347 unsigned long flags;
1348
1349 trace_cfg80211_stop_iface(wiphy, wdev);
1350
1351 ev = kzalloc(sizeof(*ev), gfp);
1352 if (!ev)
1353 return;
1354
1355 ev->type = EVENT_STOPPED;
1356
1357 spin_lock_irqsave(&wdev->event_lock, flags);
1358 list_add_tail(&ev->list, &wdev->event_list);
1359 spin_unlock_irqrestore(&wdev->event_lock, flags);
1360 queue_work(cfg80211_wq, &rdev->event_work);
1361 }
1362 EXPORT_SYMBOL(cfg80211_stop_iface);
1363
cfg80211_init_wdev(struct wireless_dev * wdev)1364 void cfg80211_init_wdev(struct wireless_dev *wdev)
1365 {
1366 mutex_init(&wdev->mtx);
1367 INIT_LIST_HEAD(&wdev->event_list);
1368 spin_lock_init(&wdev->event_lock);
1369 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1370 INIT_LIST_HEAD(&wdev->pmsr_list);
1371 spin_lock_init(&wdev->pmsr_lock);
1372 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1373
1374 #ifdef CONFIG_CFG80211_WEXT
1375 wdev->wext.default_key = -1;
1376 wdev->wext.default_mgmt_key = -1;
1377 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1378 #endif
1379
1380 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1381
1382 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1383 wdev->ps = true;
1384 else
1385 wdev->ps = false;
1386 /* allow mac80211 to determine the timeout */
1387 wdev->ps_timeout = -1;
1388
1389 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1390 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1391 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1392 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1393
1394 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1395 }
1396
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1397 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1398 struct wireless_dev *wdev)
1399 {
1400 ASSERT_RTNL();
1401 lockdep_assert_held(&rdev->wiphy.mtx);
1402
1403 /*
1404 * We get here also when the interface changes network namespaces,
1405 * as it's registered into the new one, but we don't want it to
1406 * change ID in that case. Checking if the ID is already assigned
1407 * works, because 0 isn't considered a valid ID and the memory is
1408 * 0-initialized.
1409 */
1410 if (!wdev->identifier)
1411 wdev->identifier = ++rdev->wdev_id;
1412 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1413 rdev->devlist_generation++;
1414 wdev->registered = true;
1415
1416 if (wdev->netdev &&
1417 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1418 "phy80211"))
1419 pr_err("failed to add phy80211 symlink to netdev!\n");
1420
1421 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1422 }
1423
cfg80211_register_netdevice(struct net_device * dev)1424 int cfg80211_register_netdevice(struct net_device *dev)
1425 {
1426 struct wireless_dev *wdev = dev->ieee80211_ptr;
1427 struct cfg80211_registered_device *rdev;
1428 int ret;
1429
1430 ASSERT_RTNL();
1431
1432 if (WARN_ON(!wdev))
1433 return -EINVAL;
1434
1435 rdev = wiphy_to_rdev(wdev->wiphy);
1436
1437 lockdep_assert_held(&rdev->wiphy.mtx);
1438
1439 /* we'll take care of this */
1440 wdev->registered = true;
1441 wdev->registering = true;
1442 ret = register_netdevice(dev);
1443 if (ret)
1444 goto out;
1445
1446 cfg80211_register_wdev(rdev, wdev);
1447 ret = 0;
1448 out:
1449 wdev->registering = false;
1450 if (ret)
1451 wdev->registered = false;
1452 return ret;
1453 }
1454 EXPORT_SYMBOL(cfg80211_register_netdevice);
1455
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1456 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1457 unsigned long state, void *ptr)
1458 {
1459 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1460 struct wireless_dev *wdev = dev->ieee80211_ptr;
1461 struct cfg80211_registered_device *rdev;
1462 struct cfg80211_sched_scan_request *pos, *tmp;
1463
1464 if (!wdev)
1465 return NOTIFY_DONE;
1466
1467 rdev = wiphy_to_rdev(wdev->wiphy);
1468
1469 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1470
1471 switch (state) {
1472 case NETDEV_POST_INIT:
1473 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1474 wdev->netdev = dev;
1475 /* can only change netns with wiphy */
1476 dev->features |= NETIF_F_NETNS_LOCAL;
1477
1478 cfg80211_init_wdev(wdev);
1479 break;
1480 case NETDEV_REGISTER:
1481 if (!wdev->registered) {
1482 wiphy_lock(&rdev->wiphy);
1483 cfg80211_register_wdev(rdev, wdev);
1484 wiphy_unlock(&rdev->wiphy);
1485 }
1486 break;
1487 case NETDEV_UNREGISTER:
1488 /*
1489 * It is possible to get NETDEV_UNREGISTER multiple times,
1490 * so check wdev->registered.
1491 */
1492 if (wdev->registered && !wdev->registering) {
1493 wiphy_lock(&rdev->wiphy);
1494 _cfg80211_unregister_wdev(wdev, false);
1495 wiphy_unlock(&rdev->wiphy);
1496 }
1497 break;
1498 case NETDEV_GOING_DOWN:
1499 wiphy_lock(&rdev->wiphy);
1500 cfg80211_leave(rdev, wdev);
1501 cfg80211_remove_links(wdev);
1502 wiphy_unlock(&rdev->wiphy);
1503 /* since we just did cfg80211_leave() nothing to do there */
1504 cancel_work_sync(&wdev->disconnect_wk);
1505 cancel_work_sync(&wdev->pmsr_free_wk);
1506 break;
1507 case NETDEV_DOWN:
1508 wiphy_lock(&rdev->wiphy);
1509 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1510 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1511 if (WARN_ON(!rdev->scan_req->notified &&
1512 (!rdev->int_scan_req ||
1513 !rdev->int_scan_req->notified)))
1514 rdev->scan_req->info.aborted = true;
1515 ___cfg80211_scan_done(rdev, false);
1516 }
1517
1518 list_for_each_entry_safe(pos, tmp,
1519 &rdev->sched_scan_req_list, list) {
1520 if (WARN_ON(pos->dev == wdev->netdev))
1521 cfg80211_stop_sched_scan_req(rdev, pos, false);
1522 }
1523
1524 rdev->opencount--;
1525 wiphy_unlock(&rdev->wiphy);
1526 wake_up(&rdev->dev_wait);
1527 break;
1528 case NETDEV_UP:
1529 wiphy_lock(&rdev->wiphy);
1530 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1531 wdev_lock(wdev);
1532 switch (wdev->iftype) {
1533 #ifdef CONFIG_CFG80211_WEXT
1534 case NL80211_IFTYPE_ADHOC:
1535 cfg80211_ibss_wext_join(rdev, wdev);
1536 break;
1537 case NL80211_IFTYPE_STATION:
1538 cfg80211_mgd_wext_connect(rdev, wdev);
1539 break;
1540 #endif
1541 #ifdef CONFIG_MAC80211_MESH
1542 case NL80211_IFTYPE_MESH_POINT:
1543 {
1544 /* backward compat code... */
1545 struct mesh_setup setup;
1546 memcpy(&setup, &default_mesh_setup,
1547 sizeof(setup));
1548 /* back compat only needed for mesh_id */
1549 setup.mesh_id = wdev->u.mesh.id;
1550 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1551 if (wdev->u.mesh.id_up_len)
1552 __cfg80211_join_mesh(rdev, dev,
1553 &setup,
1554 &default_mesh_config);
1555 break;
1556 }
1557 #endif
1558 default:
1559 break;
1560 }
1561 wdev_unlock(wdev);
1562 rdev->opencount++;
1563
1564 /*
1565 * Configure power management to the driver here so that its
1566 * correctly set also after interface type changes etc.
1567 */
1568 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1569 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1570 rdev->ops->set_power_mgmt &&
1571 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1572 wdev->ps_timeout)) {
1573 /* assume this means it's off */
1574 wdev->ps = false;
1575 }
1576 wiphy_unlock(&rdev->wiphy);
1577 break;
1578 case NETDEV_PRE_UP:
1579 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1580 wdev->use_4addr, 0))
1581 return notifier_from_errno(-EOPNOTSUPP);
1582
1583 if (rfkill_blocked(rdev->wiphy.rfkill))
1584 return notifier_from_errno(-ERFKILL);
1585 break;
1586 default:
1587 return NOTIFY_DONE;
1588 }
1589
1590 wireless_nlevent_flush();
1591
1592 return NOTIFY_OK;
1593 }
1594
1595 static struct notifier_block cfg80211_netdev_notifier = {
1596 .notifier_call = cfg80211_netdev_notifier_call,
1597 };
1598
cfg80211_pernet_exit(struct net * net)1599 static void __net_exit cfg80211_pernet_exit(struct net *net)
1600 {
1601 struct cfg80211_registered_device *rdev;
1602
1603 rtnl_lock();
1604 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1605 if (net_eq(wiphy_net(&rdev->wiphy), net))
1606 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1607 }
1608 rtnl_unlock();
1609 }
1610
1611 static struct pernet_operations cfg80211_pernet_ops = {
1612 .exit = cfg80211_pernet_exit,
1613 };
1614
wiphy_work_queue(struct wiphy * wiphy,struct wiphy_work * work)1615 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1616 {
1617 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1618 unsigned long flags;
1619
1620 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1621 if (list_empty(&work->entry))
1622 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1623 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1624
1625 queue_work(system_unbound_wq, &rdev->wiphy_work);
1626 }
1627 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1628
wiphy_work_cancel(struct wiphy * wiphy,struct wiphy_work * work)1629 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1630 {
1631 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1632 unsigned long flags;
1633
1634 lockdep_assert_held(&wiphy->mtx);
1635
1636 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1637 if (!list_empty(&work->entry))
1638 list_del_init(&work->entry);
1639 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1640 }
1641 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1642
wiphy_delayed_work_timer(struct timer_list * t)1643 void wiphy_delayed_work_timer(struct timer_list *t)
1644 {
1645 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1646
1647 wiphy_work_queue(dwork->wiphy, &dwork->work);
1648 }
1649 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1650
wiphy_delayed_work_queue(struct wiphy * wiphy,struct wiphy_delayed_work * dwork,unsigned long delay)1651 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1652 struct wiphy_delayed_work *dwork,
1653 unsigned long delay)
1654 {
1655 if (!delay) {
1656 wiphy_work_queue(wiphy, &dwork->work);
1657 return;
1658 }
1659
1660 dwork->wiphy = wiphy;
1661 mod_timer(&dwork->timer, jiffies + delay);
1662 }
1663 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1664
wiphy_delayed_work_cancel(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1665 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1666 struct wiphy_delayed_work *dwork)
1667 {
1668 lockdep_assert_held(&wiphy->mtx);
1669
1670 del_timer_sync(&dwork->timer);
1671 wiphy_work_cancel(wiphy, &dwork->work);
1672 }
1673 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1674
cfg80211_init(void)1675 static int __init cfg80211_init(void)
1676 {
1677 int err;
1678
1679 err = register_pernet_device(&cfg80211_pernet_ops);
1680 if (err)
1681 goto out_fail_pernet;
1682
1683 err = wiphy_sysfs_init();
1684 if (err)
1685 goto out_fail_sysfs;
1686
1687 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1688 if (err)
1689 goto out_fail_notifier;
1690
1691 err = nl80211_init();
1692 if (err)
1693 goto out_fail_nl80211;
1694
1695 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1696
1697 err = regulatory_init();
1698 if (err)
1699 goto out_fail_reg;
1700
1701 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1702 if (!cfg80211_wq) {
1703 err = -ENOMEM;
1704 goto out_fail_wq;
1705 }
1706
1707 return 0;
1708
1709 out_fail_wq:
1710 regulatory_exit();
1711 out_fail_reg:
1712 debugfs_remove(ieee80211_debugfs_dir);
1713 nl80211_exit();
1714 out_fail_nl80211:
1715 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1716 out_fail_notifier:
1717 wiphy_sysfs_exit();
1718 out_fail_sysfs:
1719 unregister_pernet_device(&cfg80211_pernet_ops);
1720 out_fail_pernet:
1721 return err;
1722 }
1723 fs_initcall(cfg80211_init);
1724
cfg80211_exit(void)1725 static void __exit cfg80211_exit(void)
1726 {
1727 debugfs_remove(ieee80211_debugfs_dir);
1728 nl80211_exit();
1729 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1730 wiphy_sysfs_exit();
1731 regulatory_exit();
1732 unregister_pernet_device(&cfg80211_pernet_ops);
1733 destroy_workqueue(cfg80211_wq);
1734 }
1735 module_exit(cfg80211_exit);
1736
