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) 2018-2024 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 for_each_rdev(rdev) {
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 for_each_rdev(rdev2)
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 wiphy_lock(&rdev->wiphy);
195 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
196 if (!wdev->netdev)
197 continue;
198 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
199 }
200
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
210 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
211 if (!wdev->netdev)
212 continue;
213 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
214 }
215 wiphy_unlock(&rdev->wiphy);
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 wiphy_lock(&rdev->wiphy);
225 rdev_rfkill_poll(rdev);
226 wiphy_unlock(&rdev->wiphy);
227 }
228
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)229 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
230 struct wireless_dev *wdev)
231 {
232 lockdep_assert_held(&rdev->wiphy.mtx);
233
234 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
235 return;
236
237 if (!wdev_running(wdev))
238 return;
239
240 rdev_stop_p2p_device(rdev, wdev);
241 wdev->is_running = false;
242
243 rdev->opencount--;
244
245 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
246 if (WARN_ON(!rdev->scan_req->notified &&
247 (!rdev->int_scan_req ||
248 !rdev->int_scan_req->notified)))
249 rdev->scan_req->info.aborted = true;
250 ___cfg80211_scan_done(rdev, false);
251 }
252 }
253
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)254 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
255 struct wireless_dev *wdev)
256 {
257 lockdep_assert_held(&rdev->wiphy.mtx);
258
259 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
260 return;
261
262 if (!wdev_running(wdev))
263 return;
264
265 rdev_stop_nan(rdev, wdev);
266 wdev->is_running = false;
267
268 rdev->opencount--;
269 }
270
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)271 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
272 {
273 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
274 struct wireless_dev *wdev;
275
276 ASSERT_RTNL();
277
278 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
279 if (wdev->netdev) {
280 dev_close(wdev->netdev);
281 continue;
282 }
283
284 /* otherwise, check iftype */
285
286 wiphy_lock(wiphy);
287
288 switch (wdev->iftype) {
289 case NL80211_IFTYPE_P2P_DEVICE:
290 cfg80211_stop_p2p_device(rdev, wdev);
291 break;
292 case NL80211_IFTYPE_NAN:
293 cfg80211_stop_nan(rdev, wdev);
294 break;
295 default:
296 break;
297 }
298
299 wiphy_unlock(wiphy);
300 }
301 }
302 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
303
cfg80211_rfkill_set_block(void * data,bool blocked)304 static int cfg80211_rfkill_set_block(void *data, bool blocked)
305 {
306 struct cfg80211_registered_device *rdev = data;
307
308 if (!blocked)
309 return 0;
310
311 rtnl_lock();
312 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
313 rtnl_unlock();
314
315 return 0;
316 }
317
cfg80211_rfkill_block_work(struct work_struct * work)318 static void cfg80211_rfkill_block_work(struct work_struct *work)
319 {
320 struct cfg80211_registered_device *rdev;
321
322 rdev = container_of(work, struct cfg80211_registered_device,
323 rfkill_block);
324 cfg80211_rfkill_set_block(rdev, true);
325 }
326
cfg80211_event_work(struct work_struct * work)327 static void cfg80211_event_work(struct work_struct *work)
328 {
329 struct cfg80211_registered_device *rdev;
330
331 rdev = container_of(work, struct cfg80211_registered_device,
332 event_work);
333
334 wiphy_lock(&rdev->wiphy);
335 cfg80211_process_rdev_events(rdev);
336 wiphy_unlock(&rdev->wiphy);
337 }
338
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)339 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
340 {
341 struct wireless_dev *wdev, *tmp;
342
343 ASSERT_RTNL();
344
345 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
346 if (wdev->nl_owner_dead) {
347 if (wdev->netdev)
348 dev_close(wdev->netdev);
349
350 wiphy_lock(&rdev->wiphy);
351 cfg80211_leave(rdev, wdev);
352 cfg80211_remove_virtual_intf(rdev, wdev);
353 wiphy_unlock(&rdev->wiphy);
354 }
355 }
356 }
357
cfg80211_destroy_iface_wk(struct work_struct * work)358 static void cfg80211_destroy_iface_wk(struct work_struct *work)
359 {
360 struct cfg80211_registered_device *rdev;
361
362 rdev = container_of(work, struct cfg80211_registered_device,
363 destroy_work);
364
365 rtnl_lock();
366 cfg80211_destroy_ifaces(rdev);
367 rtnl_unlock();
368 }
369
cfg80211_sched_scan_stop_wk(struct wiphy * wiphy,struct wiphy_work * work)370 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
371 struct wiphy_work *work)
372 {
373 struct cfg80211_registered_device *rdev;
374 struct cfg80211_sched_scan_request *req, *tmp;
375
376 rdev = container_of(work, struct cfg80211_registered_device,
377 sched_scan_stop_wk);
378
379 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
380 if (req->nl_owner_dead)
381 cfg80211_stop_sched_scan_req(rdev, req, false);
382 }
383 }
384
cfg80211_propagate_radar_detect_wk(struct work_struct * work)385 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
386 {
387 struct cfg80211_registered_device *rdev;
388
389 rdev = container_of(work, struct cfg80211_registered_device,
390 propagate_radar_detect_wk);
391
392 rtnl_lock();
393
394 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
395 NL80211_DFS_UNAVAILABLE,
396 NL80211_RADAR_DETECTED);
397
398 rtnl_unlock();
399 }
400
cfg80211_propagate_cac_done_wk(struct work_struct * work)401 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
402 {
403 struct cfg80211_registered_device *rdev;
404
405 rdev = container_of(work, struct cfg80211_registered_device,
406 propagate_cac_done_wk);
407
408 rtnl_lock();
409
410 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
411 NL80211_DFS_AVAILABLE,
412 NL80211_RADAR_CAC_FINISHED);
413
414 rtnl_unlock();
415 }
416
cfg80211_wiphy_work(struct work_struct * work)417 static void cfg80211_wiphy_work(struct work_struct *work)
418 {
419 struct cfg80211_registered_device *rdev;
420 struct wiphy_work *wk;
421
422 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
423
424 wiphy_lock(&rdev->wiphy);
425 if (rdev->suspended)
426 goto out;
427
428 spin_lock_irq(&rdev->wiphy_work_lock);
429 wk = list_first_entry_or_null(&rdev->wiphy_work_list,
430 struct wiphy_work, entry);
431 if (wk) {
432 list_del_init(&wk->entry);
433 if (!list_empty(&rdev->wiphy_work_list))
434 queue_work(system_unbound_wq, work);
435 spin_unlock_irq(&rdev->wiphy_work_lock);
436
437 wk->func(&rdev->wiphy, wk);
438 } else {
439 spin_unlock_irq(&rdev->wiphy_work_lock);
440 }
441 out:
442 wiphy_unlock(&rdev->wiphy);
443 }
444
445 /* exported functions */
446
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)447 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
448 const char *requested_name)
449 {
450 static atomic_t wiphy_counter = ATOMIC_INIT(0);
451
452 struct cfg80211_registered_device *rdev;
453 int alloc_size;
454
455 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
456 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
457 WARN_ON(ops->connect && !ops->disconnect);
458 WARN_ON(ops->join_ibss && !ops->leave_ibss);
459 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
460 WARN_ON(ops->add_station && !ops->del_station);
461 WARN_ON(ops->add_mpath && !ops->del_mpath);
462 WARN_ON(ops->join_mesh && !ops->leave_mesh);
463 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
464 WARN_ON(ops->start_ap && !ops->stop_ap);
465 WARN_ON(ops->join_ocb && !ops->leave_ocb);
466 WARN_ON(ops->suspend && !ops->resume);
467 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
468 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
469 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
470 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
471
472 alloc_size = sizeof(*rdev) + sizeof_priv;
473
474 rdev = kzalloc(alloc_size, GFP_KERNEL);
475 if (!rdev)
476 return NULL;
477
478 rdev->ops = ops;
479
480 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
481
482 if (unlikely(rdev->wiphy_idx < 0)) {
483 /* ugh, wrapped! */
484 atomic_dec(&wiphy_counter);
485 kfree(rdev);
486 return NULL;
487 }
488
489 /* atomic_inc_return makes it start at 1, make it start at 0 */
490 rdev->wiphy_idx--;
491
492 /* give it a proper name */
493 if (requested_name && requested_name[0]) {
494 int rv;
495
496 rtnl_lock();
497 rv = cfg80211_dev_check_name(rdev, requested_name);
498
499 if (rv < 0) {
500 rtnl_unlock();
501 goto use_default_name;
502 }
503
504 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
505 rtnl_unlock();
506 if (rv)
507 goto use_default_name;
508 } else {
509 int rv;
510
511 use_default_name:
512 /* NOTE: This is *probably* safe w/out holding rtnl because of
513 * the restrictions on phy names. Probably this call could
514 * fail if some other part of the kernel (re)named a device
515 * phyX. But, might should add some locking and check return
516 * value, and use a different name if this one exists?
517 */
518 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
519 if (rv < 0) {
520 kfree(rdev);
521 return NULL;
522 }
523 }
524
525 mutex_init(&rdev->wiphy.mtx);
526 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
527 INIT_LIST_HEAD(&rdev->beacon_registrations);
528 spin_lock_init(&rdev->beacon_registrations_lock);
529 spin_lock_init(&rdev->bss_lock);
530 INIT_LIST_HEAD(&rdev->bss_list);
531 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
532 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
533 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
534 cfg80211_dfs_channels_update_work);
535 #ifdef CONFIG_CFG80211_WEXT
536 rdev->wiphy.wext = &cfg80211_wext_handler;
537 #endif
538
539 device_initialize(&rdev->wiphy.dev);
540 rdev->wiphy.dev.class = &ieee80211_class;
541 rdev->wiphy.dev.platform_data = rdev;
542 device_enable_async_suspend(&rdev->wiphy.dev);
543
544 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
545 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
546 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
547 INIT_WORK(&rdev->propagate_radar_detect_wk,
548 cfg80211_propagate_radar_detect_wk);
549 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
550 INIT_WORK(&rdev->mgmt_registrations_update_wk,
551 cfg80211_mgmt_registrations_update_wk);
552 spin_lock_init(&rdev->mgmt_registrations_lock);
553
554 #ifdef CONFIG_CFG80211_DEFAULT_PS
555 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
556 #endif
557
558 wiphy_net_set(&rdev->wiphy, &init_net);
559
560 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
561 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
562 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
563 &rdev->rfkill_ops, rdev);
564
565 if (!rdev->wiphy.rfkill) {
566 wiphy_free(&rdev->wiphy);
567 return NULL;
568 }
569
570 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
571 INIT_LIST_HEAD(&rdev->wiphy_work_list);
572 spin_lock_init(&rdev->wiphy_work_lock);
573 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
574 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
575 INIT_WORK(&rdev->event_work, cfg80211_event_work);
576 INIT_WORK(&rdev->background_cac_abort_wk,
577 cfg80211_background_cac_abort_wk);
578 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
579 cfg80211_background_cac_done_wk);
580
581 init_waitqueue_head(&rdev->dev_wait);
582
583 /*
584 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
585 * Fragmentation and RTS threshold are disabled by default with the
586 * special -1 value.
587 */
588 rdev->wiphy.retry_short = 7;
589 rdev->wiphy.retry_long = 4;
590 rdev->wiphy.frag_threshold = (u32) -1;
591 rdev->wiphy.rts_threshold = (u32) -1;
592 rdev->wiphy.coverage_class = 0;
593
594 rdev->wiphy.max_num_csa_counters = 1;
595
596 rdev->wiphy.max_sched_scan_plans = 1;
597 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
598
599 return &rdev->wiphy;
600 }
601 EXPORT_SYMBOL(wiphy_new_nm);
602
wiphy_verify_combinations(struct wiphy * wiphy)603 static int wiphy_verify_combinations(struct wiphy *wiphy)
604 {
605 const struct ieee80211_iface_combination *c;
606 int i, j;
607
608 for (i = 0; i < wiphy->n_iface_combinations; i++) {
609 u32 cnt = 0;
610 u16 all_iftypes = 0;
611
612 c = &wiphy->iface_combinations[i];
613
614 /*
615 * Combinations with just one interface aren't real,
616 * however we make an exception for DFS.
617 */
618 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
619 return -EINVAL;
620
621 /* Need at least one channel */
622 if (WARN_ON(!c->num_different_channels))
623 return -EINVAL;
624
625 /* DFS only works on one channel. */
626 if (WARN_ON(c->radar_detect_widths &&
627 (c->num_different_channels > 1)))
628 return -EINVAL;
629
630 if (WARN_ON(!c->n_limits))
631 return -EINVAL;
632
633 for (j = 0; j < c->n_limits; j++) {
634 u16 types = c->limits[j].types;
635
636 /* interface types shouldn't overlap */
637 if (WARN_ON(types & all_iftypes))
638 return -EINVAL;
639 all_iftypes |= types;
640
641 if (WARN_ON(!c->limits[j].max))
642 return -EINVAL;
643
644 /* Shouldn't list software iftypes in combinations! */
645 if (WARN_ON(wiphy->software_iftypes & types))
646 return -EINVAL;
647
648 /* Only a single P2P_DEVICE can be allowed */
649 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
650 c->limits[j].max > 1))
651 return -EINVAL;
652
653 /* Only a single NAN can be allowed */
654 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
655 c->limits[j].max > 1))
656 return -EINVAL;
657
658 /*
659 * This isn't well-defined right now. If you have an
660 * IBSS interface, then its beacon interval may change
661 * by joining other networks, and nothing prevents it
662 * from doing that.
663 * So technically we probably shouldn't even allow AP
664 * and IBSS in the same interface, but it seems that
665 * some drivers support that, possibly only with fixed
666 * beacon intervals for IBSS.
667 */
668 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
669 c->beacon_int_min_gcd)) {
670 return -EINVAL;
671 }
672
673 cnt += c->limits[j].max;
674 /*
675 * Don't advertise an unsupported type
676 * in a combination.
677 */
678 if (WARN_ON((wiphy->interface_modes & types) != types))
679 return -EINVAL;
680 }
681
682 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
683 return -EINVAL;
684
685 /* You can't even choose that many! */
686 if (WARN_ON(cnt < c->max_interfaces))
687 return -EINVAL;
688 }
689
690 return 0;
691 }
692
wiphy_register(struct wiphy * wiphy)693 int wiphy_register(struct wiphy *wiphy)
694 {
695 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
696 int res;
697 enum nl80211_band band;
698 struct ieee80211_supported_band *sband;
699 bool have_band = false;
700 int i;
701 u16 ifmodes = wiphy->interface_modes;
702
703 #ifdef CONFIG_PM
704 if (WARN_ON(wiphy->wowlan &&
705 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
706 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
707 return -EINVAL;
708 if (WARN_ON(wiphy->wowlan &&
709 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
710 !wiphy->wowlan->tcp))
711 return -EINVAL;
712 #endif
713 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
714 (!rdev->ops->tdls_channel_switch ||
715 !rdev->ops->tdls_cancel_channel_switch)))
716 return -EINVAL;
717
718 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
719 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
720 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
721 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
722 return -EINVAL;
723
724 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
725 return -EINVAL;
726
727 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
728 return -EINVAL;
729
730 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
731 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
732 !wiphy->pmsr_capa->ftm.non_asap))
733 return -EINVAL;
734 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
735 !wiphy->pmsr_capa->ftm.bandwidths))
736 return -EINVAL;
737 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
738 ~(BIT(NL80211_PREAMBLE_LEGACY) |
739 BIT(NL80211_PREAMBLE_HT) |
740 BIT(NL80211_PREAMBLE_VHT) |
741 BIT(NL80211_PREAMBLE_HE) |
742 BIT(NL80211_PREAMBLE_DMG))))
743 return -EINVAL;
744 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
745 wiphy->pmsr_capa->ftm.non_trigger_based) &&
746 !(wiphy->pmsr_capa->ftm.preambles &
747 BIT(NL80211_PREAMBLE_HE))))
748 return -EINVAL;
749 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
750 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
751 BIT(NL80211_CHAN_WIDTH_20) |
752 BIT(NL80211_CHAN_WIDTH_40) |
753 BIT(NL80211_CHAN_WIDTH_80) |
754 BIT(NL80211_CHAN_WIDTH_80P80) |
755 BIT(NL80211_CHAN_WIDTH_160) |
756 BIT(NL80211_CHAN_WIDTH_5) |
757 BIT(NL80211_CHAN_WIDTH_10))))
758 return -EINVAL;
759 }
760
761 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
762 (wiphy->regulatory_flags &
763 (REGULATORY_CUSTOM_REG |
764 REGULATORY_STRICT_REG |
765 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
766 REGULATORY_COUNTRY_IE_IGNORE))))
767 return -EINVAL;
768
769 if (WARN_ON(wiphy->coalesce &&
770 (!wiphy->coalesce->n_rules ||
771 !wiphy->coalesce->n_patterns) &&
772 (!wiphy->coalesce->pattern_min_len ||
773 wiphy->coalesce->pattern_min_len >
774 wiphy->coalesce->pattern_max_len)))
775 return -EINVAL;
776
777 if (WARN_ON(wiphy->ap_sme_capa &&
778 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
779 return -EINVAL;
780
781 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
782 return -EINVAL;
783
784 if (WARN_ON(wiphy->addresses &&
785 !is_zero_ether_addr(wiphy->perm_addr) &&
786 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
787 ETH_ALEN)))
788 return -EINVAL;
789
790 if (WARN_ON(wiphy->max_acl_mac_addrs &&
791 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
792 !rdev->ops->set_mac_acl)))
793 return -EINVAL;
794
795 /* assure only valid behaviours are flagged by driver
796 * hence subtract 2 as bit 0 is invalid.
797 */
798 if (WARN_ON(wiphy->bss_select_support &&
799 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
800 return -EINVAL;
801
802 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
803 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
804 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
805 return -EINVAL;
806
807 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
808 rdev->ops->update_connect_params))
809 return -EINVAL;
810
811 if (wiphy->addresses)
812 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
813
814 /* sanity check ifmodes */
815 WARN_ON(!ifmodes);
816 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
817 if (WARN_ON(ifmodes != wiphy->interface_modes))
818 wiphy->interface_modes = ifmodes;
819
820 res = wiphy_verify_combinations(wiphy);
821 if (res)
822 return res;
823
824 /* sanity check supported bands/channels */
825 for (band = 0; band < NUM_NL80211_BANDS; band++) {
826 const struct ieee80211_sband_iftype_data *iftd;
827 u16 types = 0;
828 bool have_he = false;
829
830 sband = wiphy->bands[band];
831 if (!sband)
832 continue;
833
834 sband->band = band;
835 if (WARN_ON(!sband->n_channels))
836 return -EINVAL;
837 /*
838 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
839 * n_bitrates is 0
840 */
841 if (WARN_ON((band != NL80211_BAND_60GHZ &&
842 band != NL80211_BAND_S1GHZ) &&
843 !sband->n_bitrates))
844 return -EINVAL;
845
846 if (WARN_ON(band == NL80211_BAND_6GHZ &&
847 (sband->ht_cap.ht_supported ||
848 sband->vht_cap.vht_supported)))
849 return -EINVAL;
850
851 /*
852 * Since cfg80211_disable_40mhz_24ghz is global, we can
853 * modify the sband's ht data even if the driver uses a
854 * global structure for that.
855 */
856 if (cfg80211_disable_40mhz_24ghz &&
857 band == NL80211_BAND_2GHZ &&
858 sband->ht_cap.ht_supported) {
859 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
860 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
861 }
862
863 /*
864 * Since we use a u32 for rate bitmaps in
865 * ieee80211_get_response_rate, we cannot
866 * have more than 32 legacy rates.
867 */
868 if (WARN_ON(sband->n_bitrates > 32))
869 return -EINVAL;
870
871 for (i = 0; i < sband->n_channels; i++) {
872 sband->channels[i].orig_flags =
873 sband->channels[i].flags;
874 sband->channels[i].orig_mag = INT_MAX;
875 sband->channels[i].orig_mpwr =
876 sband->channels[i].max_power;
877 sband->channels[i].band = band;
878
879 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
880 return -EINVAL;
881 }
882
883 for_each_sband_iftype_data(sband, i, iftd) {
884 bool has_ap, has_non_ap;
885 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
886 BIT(NL80211_IFTYPE_P2P_GO);
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,struct wiphy_work * end)1052 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1053 struct wiphy_work *end)
1054 {
1055 unsigned int runaway_limit = 100;
1056 unsigned long flags;
1057
1058 lockdep_assert_held(&rdev->wiphy.mtx);
1059
1060 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1061 while (!list_empty(&rdev->wiphy_work_list)) {
1062 struct wiphy_work *wk;
1063
1064 wk = list_first_entry(&rdev->wiphy_work_list,
1065 struct wiphy_work, entry);
1066 list_del_init(&wk->entry);
1067 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1068
1069 wk->func(&rdev->wiphy, wk);
1070
1071 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1072
1073 if (wk == end)
1074 break;
1075
1076 if (WARN_ON(--runaway_limit == 0))
1077 INIT_LIST_HEAD(&rdev->wiphy_work_list);
1078 }
1079 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1080 }
1081
wiphy_unregister(struct wiphy * wiphy)1082 void wiphy_unregister(struct wiphy *wiphy)
1083 {
1084 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1085
1086 wait_event(rdev->dev_wait, ({
1087 int __count;
1088 wiphy_lock(&rdev->wiphy);
1089 __count = rdev->opencount;
1090 wiphy_unlock(&rdev->wiphy);
1091 __count == 0; }));
1092
1093 if (rdev->wiphy.rfkill)
1094 rfkill_unregister(rdev->wiphy.rfkill);
1095
1096 rtnl_lock();
1097 wiphy_lock(&rdev->wiphy);
1098 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1099 rdev->wiphy.registered = false;
1100
1101 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1102
1103 /*
1104 * First remove the hardware from everywhere, this makes
1105 * it impossible to find from userspace.
1106 */
1107 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1108 list_del_rcu(&rdev->list);
1109 synchronize_rcu();
1110
1111 /*
1112 * If this device got a regulatory hint tell core its
1113 * free to listen now to a new shiny device regulatory hint
1114 */
1115 wiphy_regulatory_deregister(wiphy);
1116
1117 cfg80211_rdev_list_generation++;
1118 device_del(&rdev->wiphy.dev);
1119
1120 #ifdef CONFIG_PM
1121 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1122 rdev_set_wakeup(rdev, false);
1123 #endif
1124
1125 /* surely nothing is reachable now, clean up work */
1126 cfg80211_process_wiphy_works(rdev, NULL);
1127 wiphy_unlock(&rdev->wiphy);
1128 rtnl_unlock();
1129
1130 /* this has nothing to do now but make sure it's gone */
1131 cancel_work_sync(&rdev->wiphy_work);
1132
1133 cancel_work_sync(&rdev->conn_work);
1134 flush_work(&rdev->event_work);
1135 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1136 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1137 flush_work(&rdev->destroy_work);
1138 flush_work(&rdev->propagate_radar_detect_wk);
1139 flush_work(&rdev->propagate_cac_done_wk);
1140 flush_work(&rdev->mgmt_registrations_update_wk);
1141 flush_work(&rdev->background_cac_abort_wk);
1142
1143 cfg80211_rdev_free_wowlan(rdev);
1144 cfg80211_rdev_free_coalesce(rdev);
1145 }
1146 EXPORT_SYMBOL(wiphy_unregister);
1147
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1148 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1149 {
1150 struct cfg80211_internal_bss *scan, *tmp;
1151 struct cfg80211_beacon_registration *reg, *treg;
1152 rfkill_destroy(rdev->wiphy.rfkill);
1153 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1154 list_del(®->list);
1155 kfree(reg);
1156 }
1157 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1158 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1159 mutex_destroy(&rdev->wiphy.mtx);
1160
1161 /*
1162 * The 'regd' can only be non-NULL if we never finished
1163 * initializing the wiphy and thus never went through the
1164 * unregister path - e.g. in failure scenarios. Thus, it
1165 * cannot have been visible to anyone if non-NULL, so we
1166 * can just free it here.
1167 */
1168 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1169
1170 kfree(rdev);
1171 }
1172
wiphy_free(struct wiphy * wiphy)1173 void wiphy_free(struct wiphy *wiphy)
1174 {
1175 put_device(&wiphy->dev);
1176 }
1177 EXPORT_SYMBOL(wiphy_free);
1178
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1179 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1180 enum rfkill_hard_block_reasons reason)
1181 {
1182 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1183
1184 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1185 schedule_work(&rdev->rfkill_block);
1186 }
1187 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1188
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1189 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1190 bool unregister_netdev)
1191 {
1192 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1193 struct cfg80211_cqm_config *cqm_config;
1194 unsigned int link_id;
1195
1196 ASSERT_RTNL();
1197 lockdep_assert_held(&rdev->wiphy.mtx);
1198
1199 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1200
1201 wdev->registered = false;
1202
1203 if (wdev->netdev) {
1204 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1205 if (unregister_netdev)
1206 unregister_netdevice(wdev->netdev);
1207 }
1208
1209 list_del_rcu(&wdev->list);
1210 synchronize_net();
1211 rdev->devlist_generation++;
1212
1213 cfg80211_mlme_purge_registrations(wdev);
1214
1215 switch (wdev->iftype) {
1216 case NL80211_IFTYPE_P2P_DEVICE:
1217 cfg80211_stop_p2p_device(rdev, wdev);
1218 break;
1219 case NL80211_IFTYPE_NAN:
1220 cfg80211_stop_nan(rdev, wdev);
1221 break;
1222 default:
1223 break;
1224 }
1225
1226 #ifdef CONFIG_CFG80211_WEXT
1227 kfree_sensitive(wdev->wext.keys);
1228 wdev->wext.keys = NULL;
1229 #endif
1230 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1231 /* deleted from the list, so can't be found from nl80211 any more */
1232 cqm_config = rcu_access_pointer(wdev->cqm_config);
1233 kfree_rcu(cqm_config, rcu_head);
1234
1235 /*
1236 * Ensure that all events have been processed and
1237 * freed.
1238 */
1239 cfg80211_process_wdev_events(wdev);
1240
1241 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1242 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1243 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1244 struct cfg80211_internal_bss *curbss;
1245
1246 curbss = wdev->links[link_id].client.current_bss;
1247
1248 if (WARN_ON(curbss)) {
1249 cfg80211_unhold_bss(curbss);
1250 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1251 wdev->links[link_id].client.current_bss = NULL;
1252 }
1253 }
1254 }
1255
1256 wdev->connected = false;
1257 }
1258
cfg80211_unregister_wdev(struct wireless_dev * wdev)1259 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1260 {
1261 _cfg80211_unregister_wdev(wdev, true);
1262 }
1263 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1264
1265 static const struct device_type wiphy_type = {
1266 .name = "wlan",
1267 };
1268
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1269 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1270 enum nl80211_iftype iftype, int num)
1271 {
1272 lockdep_assert_held(&rdev->wiphy.mtx);
1273
1274 rdev->num_running_ifaces += num;
1275 if (iftype == NL80211_IFTYPE_MONITOR)
1276 rdev->num_running_monitor_ifaces += num;
1277 }
1278
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1279 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1280 struct wireless_dev *wdev)
1281 {
1282 struct net_device *dev = wdev->netdev;
1283 struct cfg80211_sched_scan_request *pos, *tmp;
1284
1285 lockdep_assert_held(&rdev->wiphy.mtx);
1286
1287 cfg80211_pmsr_wdev_down(wdev);
1288
1289 cfg80211_stop_background_radar_detection(wdev);
1290
1291 switch (wdev->iftype) {
1292 case NL80211_IFTYPE_ADHOC:
1293 cfg80211_leave_ibss(rdev, dev, true);
1294 break;
1295 case NL80211_IFTYPE_P2P_CLIENT:
1296 case NL80211_IFTYPE_STATION:
1297 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1298 list) {
1299 if (dev == pos->dev)
1300 cfg80211_stop_sched_scan_req(rdev, pos, false);
1301 }
1302
1303 #ifdef CONFIG_CFG80211_WEXT
1304 kfree(wdev->wext.ie);
1305 wdev->wext.ie = NULL;
1306 wdev->wext.ie_len = 0;
1307 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1308 #endif
1309 cfg80211_disconnect(rdev, dev,
1310 WLAN_REASON_DEAUTH_LEAVING, true);
1311 break;
1312 case NL80211_IFTYPE_MESH_POINT:
1313 cfg80211_leave_mesh(rdev, dev);
1314 break;
1315 case NL80211_IFTYPE_AP:
1316 case NL80211_IFTYPE_P2P_GO:
1317 cfg80211_stop_ap(rdev, dev, -1, true);
1318 break;
1319 case NL80211_IFTYPE_OCB:
1320 cfg80211_leave_ocb(rdev, dev);
1321 break;
1322 case NL80211_IFTYPE_P2P_DEVICE:
1323 case NL80211_IFTYPE_NAN:
1324 /* cannot happen, has no netdev */
1325 break;
1326 case NL80211_IFTYPE_AP_VLAN:
1327 case NL80211_IFTYPE_MONITOR:
1328 /* nothing to do */
1329 break;
1330 case NL80211_IFTYPE_UNSPECIFIED:
1331 case NL80211_IFTYPE_WDS:
1332 case NUM_NL80211_IFTYPES:
1333 /* invalid */
1334 break;
1335 }
1336 }
1337
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1338 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1339 gfp_t gfp)
1340 {
1341 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1342 struct cfg80211_event *ev;
1343 unsigned long flags;
1344
1345 trace_cfg80211_stop_iface(wiphy, wdev);
1346
1347 ev = kzalloc(sizeof(*ev), gfp);
1348 if (!ev)
1349 return;
1350
1351 ev->type = EVENT_STOPPED;
1352
1353 spin_lock_irqsave(&wdev->event_lock, flags);
1354 list_add_tail(&ev->list, &wdev->event_list);
1355 spin_unlock_irqrestore(&wdev->event_lock, flags);
1356 queue_work(cfg80211_wq, &rdev->event_work);
1357 }
1358 EXPORT_SYMBOL(cfg80211_stop_iface);
1359
cfg80211_init_wdev(struct wireless_dev * wdev)1360 void cfg80211_init_wdev(struct wireless_dev *wdev)
1361 {
1362 INIT_LIST_HEAD(&wdev->event_list);
1363 spin_lock_init(&wdev->event_lock);
1364 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1365 INIT_LIST_HEAD(&wdev->pmsr_list);
1366 spin_lock_init(&wdev->pmsr_lock);
1367 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1368
1369 #ifdef CONFIG_CFG80211_WEXT
1370 wdev->wext.default_key = -1;
1371 wdev->wext.default_mgmt_key = -1;
1372 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1373 #endif
1374
1375 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1376
1377 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1378 wdev->ps = true;
1379 else
1380 wdev->ps = false;
1381 /* allow mac80211 to determine the timeout */
1382 wdev->ps_timeout = -1;
1383
1384 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1385 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1386 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1387 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1388
1389 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1390 }
1391
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1392 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1393 struct wireless_dev *wdev)
1394 {
1395 ASSERT_RTNL();
1396 lockdep_assert_held(&rdev->wiphy.mtx);
1397
1398 /*
1399 * We get here also when the interface changes network namespaces,
1400 * as it's registered into the new one, but we don't want it to
1401 * change ID in that case. Checking if the ID is already assigned
1402 * works, because 0 isn't considered a valid ID and the memory is
1403 * 0-initialized.
1404 */
1405 if (!wdev->identifier)
1406 wdev->identifier = ++rdev->wdev_id;
1407 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1408 rdev->devlist_generation++;
1409 wdev->registered = true;
1410
1411 if (wdev->netdev &&
1412 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1413 "phy80211"))
1414 pr_err("failed to add phy80211 symlink to netdev!\n");
1415
1416 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1417 }
1418
cfg80211_register_netdevice(struct net_device * dev)1419 int cfg80211_register_netdevice(struct net_device *dev)
1420 {
1421 struct wireless_dev *wdev = dev->ieee80211_ptr;
1422 struct cfg80211_registered_device *rdev;
1423 int ret;
1424
1425 ASSERT_RTNL();
1426
1427 if (WARN_ON(!wdev))
1428 return -EINVAL;
1429
1430 rdev = wiphy_to_rdev(wdev->wiphy);
1431
1432 lockdep_assert_held(&rdev->wiphy.mtx);
1433
1434 /* we'll take care of this */
1435 wdev->registered = true;
1436 wdev->registering = true;
1437 ret = register_netdevice(dev);
1438 if (ret)
1439 goto out;
1440
1441 cfg80211_register_wdev(rdev, wdev);
1442 ret = 0;
1443 out:
1444 wdev->registering = false;
1445 if (ret)
1446 wdev->registered = false;
1447 return ret;
1448 }
1449 EXPORT_SYMBOL(cfg80211_register_netdevice);
1450
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1451 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1452 unsigned long state, void *ptr)
1453 {
1454 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1455 struct wireless_dev *wdev = dev->ieee80211_ptr;
1456 struct cfg80211_registered_device *rdev;
1457 struct cfg80211_sched_scan_request *pos, *tmp;
1458
1459 if (!wdev)
1460 return NOTIFY_DONE;
1461
1462 rdev = wiphy_to_rdev(wdev->wiphy);
1463
1464 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1465
1466 switch (state) {
1467 case NETDEV_POST_INIT:
1468 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1469 wdev->netdev = dev;
1470 /* can only change netns with wiphy */
1471 dev->features |= NETIF_F_NETNS_LOCAL;
1472
1473 cfg80211_init_wdev(wdev);
1474 break;
1475 case NETDEV_REGISTER:
1476 if (!wdev->registered) {
1477 wiphy_lock(&rdev->wiphy);
1478 cfg80211_register_wdev(rdev, wdev);
1479 wiphy_unlock(&rdev->wiphy);
1480 }
1481 break;
1482 case NETDEV_UNREGISTER:
1483 /*
1484 * It is possible to get NETDEV_UNREGISTER multiple times,
1485 * so check wdev->registered.
1486 */
1487 if (wdev->registered && !wdev->registering) {
1488 wiphy_lock(&rdev->wiphy);
1489 _cfg80211_unregister_wdev(wdev, false);
1490 wiphy_unlock(&rdev->wiphy);
1491 }
1492 break;
1493 case NETDEV_GOING_DOWN:
1494 wiphy_lock(&rdev->wiphy);
1495 cfg80211_leave(rdev, wdev);
1496 cfg80211_remove_links(wdev);
1497 wiphy_unlock(&rdev->wiphy);
1498 /* since we just did cfg80211_leave() nothing to do there */
1499 cancel_work_sync(&wdev->disconnect_wk);
1500 cancel_work_sync(&wdev->pmsr_free_wk);
1501 break;
1502 case NETDEV_DOWN:
1503 wiphy_lock(&rdev->wiphy);
1504 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1505 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1506 if (WARN_ON(!rdev->scan_req->notified &&
1507 (!rdev->int_scan_req ||
1508 !rdev->int_scan_req->notified)))
1509 rdev->scan_req->info.aborted = true;
1510 ___cfg80211_scan_done(rdev, false);
1511 }
1512
1513 list_for_each_entry_safe(pos, tmp,
1514 &rdev->sched_scan_req_list, list) {
1515 if (WARN_ON(pos->dev == wdev->netdev))
1516 cfg80211_stop_sched_scan_req(rdev, pos, false);
1517 }
1518
1519 rdev->opencount--;
1520 wiphy_unlock(&rdev->wiphy);
1521 wake_up(&rdev->dev_wait);
1522 break;
1523 case NETDEV_UP:
1524 wiphy_lock(&rdev->wiphy);
1525 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1526 switch (wdev->iftype) {
1527 #ifdef CONFIG_CFG80211_WEXT
1528 case NL80211_IFTYPE_ADHOC:
1529 cfg80211_ibss_wext_join(rdev, wdev);
1530 break;
1531 case NL80211_IFTYPE_STATION:
1532 cfg80211_mgd_wext_connect(rdev, wdev);
1533 break;
1534 #endif
1535 #ifdef CONFIG_MAC80211_MESH
1536 case NL80211_IFTYPE_MESH_POINT:
1537 {
1538 /* backward compat code... */
1539 struct mesh_setup setup;
1540 memcpy(&setup, &default_mesh_setup,
1541 sizeof(setup));
1542 /* back compat only needed for mesh_id */
1543 setup.mesh_id = wdev->u.mesh.id;
1544 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1545 if (wdev->u.mesh.id_up_len)
1546 __cfg80211_join_mesh(rdev, dev,
1547 &setup,
1548 &default_mesh_config);
1549 break;
1550 }
1551 #endif
1552 default:
1553 break;
1554 }
1555 rdev->opencount++;
1556
1557 /*
1558 * Configure power management to the driver here so that its
1559 * correctly set also after interface type changes etc.
1560 */
1561 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1562 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1563 rdev->ops->set_power_mgmt &&
1564 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1565 wdev->ps_timeout)) {
1566 /* assume this means it's off */
1567 wdev->ps = false;
1568 }
1569 wiphy_unlock(&rdev->wiphy);
1570 break;
1571 case NETDEV_PRE_UP:
1572 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1573 wdev->use_4addr, 0))
1574 return notifier_from_errno(-EOPNOTSUPP);
1575
1576 if (rfkill_blocked(rdev->wiphy.rfkill))
1577 return notifier_from_errno(-ERFKILL);
1578 break;
1579 default:
1580 return NOTIFY_DONE;
1581 }
1582
1583 wireless_nlevent_flush();
1584
1585 return NOTIFY_OK;
1586 }
1587
1588 static struct notifier_block cfg80211_netdev_notifier = {
1589 .notifier_call = cfg80211_netdev_notifier_call,
1590 };
1591
cfg80211_pernet_exit(struct net * net)1592 static void __net_exit cfg80211_pernet_exit(struct net *net)
1593 {
1594 struct cfg80211_registered_device *rdev;
1595
1596 rtnl_lock();
1597 for_each_rdev(rdev) {
1598 if (net_eq(wiphy_net(&rdev->wiphy), net))
1599 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1600 }
1601 rtnl_unlock();
1602 }
1603
1604 static struct pernet_operations cfg80211_pernet_ops = {
1605 .exit = cfg80211_pernet_exit,
1606 };
1607
wiphy_work_queue(struct wiphy * wiphy,struct wiphy_work * work)1608 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1609 {
1610 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1611 unsigned long flags;
1612
1613 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1614 if (list_empty(&work->entry))
1615 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1616 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1617
1618 queue_work(system_unbound_wq, &rdev->wiphy_work);
1619 }
1620 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1621
wiphy_work_cancel(struct wiphy * wiphy,struct wiphy_work * work)1622 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1623 {
1624 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1625 unsigned long flags;
1626
1627 lockdep_assert_held(&wiphy->mtx);
1628
1629 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1630 if (!list_empty(&work->entry))
1631 list_del_init(&work->entry);
1632 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1633 }
1634 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1635
wiphy_work_flush(struct wiphy * wiphy,struct wiphy_work * work)1636 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1637 {
1638 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1639 unsigned long flags;
1640 bool run;
1641
1642 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1643 run = !work || !list_empty(&work->entry);
1644 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1645
1646 if (run)
1647 cfg80211_process_wiphy_works(rdev, work);
1648 }
1649 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1650
wiphy_delayed_work_timer(struct timer_list * t)1651 void wiphy_delayed_work_timer(struct timer_list *t)
1652 {
1653 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1654
1655 wiphy_work_queue(dwork->wiphy, &dwork->work);
1656 }
1657 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1658
wiphy_delayed_work_queue(struct wiphy * wiphy,struct wiphy_delayed_work * dwork,unsigned long delay)1659 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1660 struct wiphy_delayed_work *dwork,
1661 unsigned long delay)
1662 {
1663 if (!delay) {
1664 del_timer(&dwork->timer);
1665 wiphy_work_queue(wiphy, &dwork->work);
1666 return;
1667 }
1668
1669 dwork->wiphy = wiphy;
1670 mod_timer(&dwork->timer, jiffies + delay);
1671 }
1672 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1673
wiphy_delayed_work_cancel(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1674 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1675 struct wiphy_delayed_work *dwork)
1676 {
1677 lockdep_assert_held(&wiphy->mtx);
1678
1679 del_timer_sync(&dwork->timer);
1680 wiphy_work_cancel(wiphy, &dwork->work);
1681 }
1682 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1683
wiphy_delayed_work_flush(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1684 void wiphy_delayed_work_flush(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_flush(wiphy, &dwork->work);
1691 }
1692 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1693
cfg80211_init(void)1694 static int __init cfg80211_init(void)
1695 {
1696 int err;
1697
1698 err = register_pernet_device(&cfg80211_pernet_ops);
1699 if (err)
1700 goto out_fail_pernet;
1701
1702 err = wiphy_sysfs_init();
1703 if (err)
1704 goto out_fail_sysfs;
1705
1706 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1707 if (err)
1708 goto out_fail_notifier;
1709
1710 err = nl80211_init();
1711 if (err)
1712 goto out_fail_nl80211;
1713
1714 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1715
1716 err = regulatory_init();
1717 if (err)
1718 goto out_fail_reg;
1719
1720 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1721 if (!cfg80211_wq) {
1722 err = -ENOMEM;
1723 goto out_fail_wq;
1724 }
1725
1726 return 0;
1727
1728 out_fail_wq:
1729 regulatory_exit();
1730 out_fail_reg:
1731 debugfs_remove(ieee80211_debugfs_dir);
1732 nl80211_exit();
1733 out_fail_nl80211:
1734 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1735 out_fail_notifier:
1736 wiphy_sysfs_exit();
1737 out_fail_sysfs:
1738 unregister_pernet_device(&cfg80211_pernet_ops);
1739 out_fail_pernet:
1740 return err;
1741 }
1742 fs_initcall(cfg80211_init);
1743
cfg80211_exit(void)1744 static void __exit cfg80211_exit(void)
1745 {
1746 debugfs_remove(ieee80211_debugfs_dir);
1747 nl80211_exit();
1748 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1749 wiphy_sysfs_exit();
1750 regulatory_exit();
1751 unregister_pernet_device(&cfg80211_pernet_ops);
1752 destroy_workqueue(cfg80211_wq);
1753 }
1754 module_exit(cfg80211_exit);
1755