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->netns_local = false;
169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
170 if (err)
171 break;
172 wdev->netdev->netns_local = true;
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->netns_local = false;
185 err = dev_change_net_namespace(wdev->netdev, net,
186 "wlan%d");
187 WARN_ON(err);
188 wdev->netdev->netns_local = true;
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 trace_wiphy_work_worker_start(&rdev->wiphy);
425
426 wiphy_lock(&rdev->wiphy);
427 if (rdev->suspended)
428 goto out;
429
430 spin_lock_irq(&rdev->wiphy_work_lock);
431 wk = list_first_entry_or_null(&rdev->wiphy_work_list,
432 struct wiphy_work, entry);
433 if (wk) {
434 list_del_init(&wk->entry);
435 if (!list_empty(&rdev->wiphy_work_list))
436 queue_work(system_unbound_wq, work);
437 spin_unlock_irq(&rdev->wiphy_work_lock);
438
439 trace_wiphy_work_run(&rdev->wiphy, wk);
440 wk->func(&rdev->wiphy, wk);
441 } else {
442 spin_unlock_irq(&rdev->wiphy_work_lock);
443 }
444 out:
445 wiphy_unlock(&rdev->wiphy);
446 }
447
448 /* exported functions */
449
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)450 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
451 const char *requested_name)
452 {
453 static atomic_t wiphy_counter = ATOMIC_INIT(0);
454
455 struct cfg80211_registered_device *rdev;
456 int alloc_size;
457
458 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
459 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
460 WARN_ON(ops->connect && !ops->disconnect);
461 WARN_ON(ops->join_ibss && !ops->leave_ibss);
462 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
463 WARN_ON(ops->add_station && !ops->del_station);
464 WARN_ON(ops->add_mpath && !ops->del_mpath);
465 WARN_ON(ops->join_mesh && !ops->leave_mesh);
466 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
467 WARN_ON(ops->start_ap && !ops->stop_ap);
468 WARN_ON(ops->join_ocb && !ops->leave_ocb);
469 WARN_ON(ops->suspend && !ops->resume);
470 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
471 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
472 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
473 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
474
475 alloc_size = sizeof(*rdev) + sizeof_priv;
476
477 rdev = kzalloc(alloc_size, GFP_KERNEL);
478 if (!rdev)
479 return NULL;
480
481 rdev->ops = ops;
482
483 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
484
485 if (unlikely(rdev->wiphy_idx < 0)) {
486 /* ugh, wrapped! */
487 atomic_dec(&wiphy_counter);
488 kfree(rdev);
489 return NULL;
490 }
491
492 /* atomic_inc_return makes it start at 1, make it start at 0 */
493 rdev->wiphy_idx--;
494
495 /* give it a proper name */
496 if (requested_name && requested_name[0]) {
497 int rv;
498
499 rtnl_lock();
500 rv = cfg80211_dev_check_name(rdev, requested_name);
501
502 if (rv < 0) {
503 rtnl_unlock();
504 goto use_default_name;
505 }
506
507 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
508 rtnl_unlock();
509 if (rv)
510 goto use_default_name;
511 } else {
512 int rv;
513
514 use_default_name:
515 /* NOTE: This is *probably* safe w/out holding rtnl because of
516 * the restrictions on phy names. Probably this call could
517 * fail if some other part of the kernel (re)named a device
518 * phyX. But, might should add some locking and check return
519 * value, and use a different name if this one exists?
520 */
521 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
522 if (rv < 0) {
523 kfree(rdev);
524 return NULL;
525 }
526 }
527
528 mutex_init(&rdev->wiphy.mtx);
529 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
530 INIT_LIST_HEAD(&rdev->beacon_registrations);
531 spin_lock_init(&rdev->beacon_registrations_lock);
532 spin_lock_init(&rdev->bss_lock);
533 INIT_LIST_HEAD(&rdev->bss_list);
534 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
535 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
536 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
537 cfg80211_dfs_channels_update_work);
538 #ifdef CONFIG_CFG80211_WEXT
539 rdev->wiphy.wext = &cfg80211_wext_handler;
540 #endif
541
542 device_initialize(&rdev->wiphy.dev);
543 rdev->wiphy.dev.class = &ieee80211_class;
544 rdev->wiphy.dev.platform_data = rdev;
545 device_enable_async_suspend(&rdev->wiphy.dev);
546
547 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
548 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
549 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
550 INIT_WORK(&rdev->propagate_radar_detect_wk,
551 cfg80211_propagate_radar_detect_wk);
552 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
553 INIT_WORK(&rdev->mgmt_registrations_update_wk,
554 cfg80211_mgmt_registrations_update_wk);
555 spin_lock_init(&rdev->mgmt_registrations_lock);
556
557 #ifdef CONFIG_CFG80211_DEFAULT_PS
558 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
559 #endif
560
561 wiphy_net_set(&rdev->wiphy, &init_net);
562
563 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
564 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
565 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
566 &rdev->rfkill_ops, rdev);
567
568 if (!rdev->wiphy.rfkill) {
569 wiphy_free(&rdev->wiphy);
570 return NULL;
571 }
572
573 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
574 INIT_LIST_HEAD(&rdev->wiphy_work_list);
575 spin_lock_init(&rdev->wiphy_work_lock);
576 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
577 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
578 INIT_WORK(&rdev->event_work, cfg80211_event_work);
579 INIT_WORK(&rdev->background_cac_abort_wk,
580 cfg80211_background_cac_abort_wk);
581 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
582 cfg80211_background_cac_done_wk);
583
584 init_waitqueue_head(&rdev->dev_wait);
585
586 /*
587 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
588 * Fragmentation and RTS threshold are disabled by default with the
589 * special -1 value.
590 */
591 rdev->wiphy.retry_short = 7;
592 rdev->wiphy.retry_long = 4;
593 rdev->wiphy.frag_threshold = (u32) -1;
594 rdev->wiphy.rts_threshold = (u32) -1;
595 rdev->wiphy.coverage_class = 0;
596
597 rdev->wiphy.max_num_csa_counters = 1;
598
599 rdev->wiphy.max_sched_scan_plans = 1;
600 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
601
602 return &rdev->wiphy;
603 }
604 EXPORT_SYMBOL(wiphy_new_nm);
605
wiphy_verify_combinations(struct wiphy * wiphy)606 static int wiphy_verify_combinations(struct wiphy *wiphy)
607 {
608 const struct ieee80211_iface_combination *c;
609 int i, j;
610
611 for (i = 0; i < wiphy->n_iface_combinations; i++) {
612 u32 cnt = 0;
613 u16 all_iftypes = 0;
614
615 c = &wiphy->iface_combinations[i];
616
617 /*
618 * Combinations with just one interface aren't real,
619 * however we make an exception for DFS.
620 */
621 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
622 return -EINVAL;
623
624 /* Need at least one channel */
625 if (WARN_ON(!c->num_different_channels))
626 return -EINVAL;
627
628 /* DFS only works on one channel. */
629 if (WARN_ON(c->radar_detect_widths &&
630 (c->num_different_channels > 1)))
631 return -EINVAL;
632
633 if (WARN_ON(!c->n_limits))
634 return -EINVAL;
635
636 for (j = 0; j < c->n_limits; j++) {
637 u16 types = c->limits[j].types;
638
639 /* interface types shouldn't overlap */
640 if (WARN_ON(types & all_iftypes))
641 return -EINVAL;
642 all_iftypes |= types;
643
644 if (WARN_ON(!c->limits[j].max))
645 return -EINVAL;
646
647 /* Shouldn't list software iftypes in combinations! */
648 if (WARN_ON(wiphy->software_iftypes & types))
649 return -EINVAL;
650
651 /* Only a single P2P_DEVICE can be allowed */
652 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
653 c->limits[j].max > 1))
654 return -EINVAL;
655
656 /* Only a single NAN can be allowed */
657 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
658 c->limits[j].max > 1))
659 return -EINVAL;
660
661 /*
662 * This isn't well-defined right now. If you have an
663 * IBSS interface, then its beacon interval may change
664 * by joining other networks, and nothing prevents it
665 * from doing that.
666 * So technically we probably shouldn't even allow AP
667 * and IBSS in the same interface, but it seems that
668 * some drivers support that, possibly only with fixed
669 * beacon intervals for IBSS.
670 */
671 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
672 c->beacon_int_min_gcd)) {
673 return -EINVAL;
674 }
675
676 cnt += c->limits[j].max;
677 /*
678 * Don't advertise an unsupported type
679 * in a combination.
680 */
681 if (WARN_ON((wiphy->interface_modes & types) != types))
682 return -EINVAL;
683 }
684
685 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
686 return -EINVAL;
687
688 /* You can't even choose that many! */
689 if (WARN_ON(cnt < c->max_interfaces))
690 return -EINVAL;
691 }
692
693 return 0;
694 }
695
wiphy_register(struct wiphy * wiphy)696 int wiphy_register(struct wiphy *wiphy)
697 {
698 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
699 int res;
700 enum nl80211_band band;
701 struct ieee80211_supported_band *sband;
702 bool have_band = false;
703 int i;
704 u16 ifmodes = wiphy->interface_modes;
705
706 #ifdef CONFIG_PM
707 if (WARN_ON(wiphy->wowlan &&
708 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
709 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
710 return -EINVAL;
711 if (WARN_ON(wiphy->wowlan &&
712 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
713 !wiphy->wowlan->tcp))
714 return -EINVAL;
715 #endif
716 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
717 (!rdev->ops->tdls_channel_switch ||
718 !rdev->ops->tdls_cancel_channel_switch)))
719 return -EINVAL;
720
721 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
722 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
723 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
724 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
725 return -EINVAL;
726
727 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
728 return -EINVAL;
729
730 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
731 return -EINVAL;
732
733 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
734 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
735 !wiphy->pmsr_capa->ftm.non_asap))
736 return -EINVAL;
737 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
738 !wiphy->pmsr_capa->ftm.bandwidths))
739 return -EINVAL;
740 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
741 ~(BIT(NL80211_PREAMBLE_LEGACY) |
742 BIT(NL80211_PREAMBLE_HT) |
743 BIT(NL80211_PREAMBLE_VHT) |
744 BIT(NL80211_PREAMBLE_HE) |
745 BIT(NL80211_PREAMBLE_DMG))))
746 return -EINVAL;
747 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
748 wiphy->pmsr_capa->ftm.non_trigger_based) &&
749 !(wiphy->pmsr_capa->ftm.preambles &
750 BIT(NL80211_PREAMBLE_HE))))
751 return -EINVAL;
752 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
753 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
754 BIT(NL80211_CHAN_WIDTH_20) |
755 BIT(NL80211_CHAN_WIDTH_40) |
756 BIT(NL80211_CHAN_WIDTH_80) |
757 BIT(NL80211_CHAN_WIDTH_80P80) |
758 BIT(NL80211_CHAN_WIDTH_160) |
759 BIT(NL80211_CHAN_WIDTH_5) |
760 BIT(NL80211_CHAN_WIDTH_10))))
761 return -EINVAL;
762 }
763
764 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
765 (wiphy->regulatory_flags &
766 (REGULATORY_CUSTOM_REG |
767 REGULATORY_STRICT_REG |
768 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
769 REGULATORY_COUNTRY_IE_IGNORE))))
770 return -EINVAL;
771
772 if (WARN_ON(wiphy->coalesce &&
773 (!wiphy->coalesce->n_rules ||
774 !wiphy->coalesce->n_patterns) &&
775 (!wiphy->coalesce->pattern_min_len ||
776 wiphy->coalesce->pattern_min_len >
777 wiphy->coalesce->pattern_max_len)))
778 return -EINVAL;
779
780 if (WARN_ON(wiphy->ap_sme_capa &&
781 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
782 return -EINVAL;
783
784 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
785 return -EINVAL;
786
787 if (WARN_ON(wiphy->addresses &&
788 !is_zero_ether_addr(wiphy->perm_addr) &&
789 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
790 ETH_ALEN)))
791 return -EINVAL;
792
793 if (WARN_ON(wiphy->max_acl_mac_addrs &&
794 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
795 !rdev->ops->set_mac_acl)))
796 return -EINVAL;
797
798 /* assure only valid behaviours are flagged by driver
799 * hence subtract 2 as bit 0 is invalid.
800 */
801 if (WARN_ON(wiphy->bss_select_support &&
802 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
803 return -EINVAL;
804
805 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
806 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
807 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
808 return -EINVAL;
809
810 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
811 rdev->ops->update_connect_params))
812 return -EINVAL;
813
814 if (wiphy->addresses)
815 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
816
817 /* sanity check ifmodes */
818 WARN_ON(!ifmodes);
819 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
820 if (WARN_ON(ifmodes != wiphy->interface_modes))
821 wiphy->interface_modes = ifmodes;
822
823 res = wiphy_verify_combinations(wiphy);
824 if (res)
825 return res;
826
827 /* sanity check supported bands/channels */
828 for (band = 0; band < NUM_NL80211_BANDS; band++) {
829 const struct ieee80211_sband_iftype_data *iftd;
830 u16 types = 0;
831 bool have_he = false;
832
833 sband = wiphy->bands[band];
834 if (!sband)
835 continue;
836
837 sband->band = band;
838 if (WARN_ON(!sband->n_channels))
839 return -EINVAL;
840 /*
841 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
842 * n_bitrates is 0
843 */
844 if (WARN_ON((band != NL80211_BAND_60GHZ &&
845 band != NL80211_BAND_S1GHZ) &&
846 !sband->n_bitrates))
847 return -EINVAL;
848
849 if (WARN_ON(band == NL80211_BAND_6GHZ &&
850 (sband->ht_cap.ht_supported ||
851 sband->vht_cap.vht_supported)))
852 return -EINVAL;
853
854 /*
855 * Since cfg80211_disable_40mhz_24ghz is global, we can
856 * modify the sband's ht data even if the driver uses a
857 * global structure for that.
858 */
859 if (cfg80211_disable_40mhz_24ghz &&
860 band == NL80211_BAND_2GHZ &&
861 sband->ht_cap.ht_supported) {
862 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
863 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
864 }
865
866 /*
867 * Since we use a u32 for rate bitmaps in
868 * ieee80211_get_response_rate, we cannot
869 * have more than 32 legacy rates.
870 */
871 if (WARN_ON(sband->n_bitrates > 32))
872 return -EINVAL;
873
874 for (i = 0; i < sband->n_channels; i++) {
875 sband->channels[i].orig_flags =
876 sband->channels[i].flags;
877 sband->channels[i].orig_mag = INT_MAX;
878 sband->channels[i].orig_mpwr =
879 sband->channels[i].max_power;
880 sband->channels[i].band = band;
881
882 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
883 return -EINVAL;
884 }
885
886 for_each_sband_iftype_data(sband, i, iftd) {
887 bool has_ap, has_non_ap;
888 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
889 BIT(NL80211_IFTYPE_P2P_GO);
890
891 if (WARN_ON(!iftd->types_mask))
892 return -EINVAL;
893 if (WARN_ON(types & iftd->types_mask))
894 return -EINVAL;
895
896 /* at least one piece of information must be present */
897 if (WARN_ON(!iftd->he_cap.has_he))
898 return -EINVAL;
899
900 types |= iftd->types_mask;
901
902 if (i == 0)
903 have_he = iftd->he_cap.has_he;
904 else
905 have_he = have_he &&
906 iftd->he_cap.has_he;
907
908 has_ap = iftd->types_mask & ap_bits;
909 has_non_ap = iftd->types_mask & ~ap_bits;
910
911 /*
912 * For EHT 20 MHz STA, the capabilities format differs
913 * but to simplify, don't check 20 MHz but rather check
914 * only if AP and non-AP were mentioned at the same time,
915 * reject if so.
916 */
917 if (WARN_ON(iftd->eht_cap.has_eht &&
918 has_ap && has_non_ap))
919 return -EINVAL;
920 }
921
922 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
923 return -EINVAL;
924
925 have_band = true;
926 }
927
928 if (!have_band) {
929 WARN_ON(1);
930 return -EINVAL;
931 }
932
933 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
934 /*
935 * Validate we have a policy (can be explicitly set to
936 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
937 * we have at least one of doit/dumpit.
938 */
939 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
940 return -EINVAL;
941 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
942 !rdev->wiphy.vendor_commands[i].dumpit))
943 return -EINVAL;
944 }
945
946 #ifdef CONFIG_PM
947 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
948 (!rdev->wiphy.wowlan->pattern_min_len ||
949 rdev->wiphy.wowlan->pattern_min_len >
950 rdev->wiphy.wowlan->pattern_max_len)))
951 return -EINVAL;
952 #endif
953
954 if (!wiphy->max_num_akm_suites)
955 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
956 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
957 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
958 return -EINVAL;
959
960 /* check and set up bitrates */
961 ieee80211_set_bitrate_flags(wiphy);
962
963 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
964
965 rtnl_lock();
966 wiphy_lock(&rdev->wiphy);
967 res = device_add(&rdev->wiphy.dev);
968 if (res) {
969 wiphy_unlock(&rdev->wiphy);
970 rtnl_unlock();
971 return res;
972 }
973
974 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
975 cfg80211_rdev_list_generation++;
976
977 /* add to debugfs */
978 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
979 ieee80211_debugfs_dir);
980
981 cfg80211_debugfs_rdev_add(rdev);
982 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
983 wiphy_unlock(&rdev->wiphy);
984
985 /* set up regulatory info */
986 wiphy_regulatory_register(wiphy);
987
988 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
989 struct regulatory_request request;
990
991 request.wiphy_idx = get_wiphy_idx(wiphy);
992 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
993 request.alpha2[0] = '9';
994 request.alpha2[1] = '9';
995
996 nl80211_send_reg_change_event(&request);
997 }
998
999 /* Check that nobody globally advertises any capabilities they do not
1000 * advertise on all possible interface types.
1001 */
1002 if (wiphy->extended_capabilities_len &&
1003 wiphy->num_iftype_ext_capab &&
1004 wiphy->iftype_ext_capab) {
1005 u8 supported_on_all, j;
1006 const struct wiphy_iftype_ext_capab *capab;
1007
1008 capab = wiphy->iftype_ext_capab;
1009 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1010 if (capab[0].extended_capabilities_len > j)
1011 supported_on_all =
1012 capab[0].extended_capabilities[j];
1013 else
1014 supported_on_all = 0x00;
1015 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1016 if (j >= capab[i].extended_capabilities_len) {
1017 supported_on_all = 0x00;
1018 break;
1019 }
1020 supported_on_all &=
1021 capab[i].extended_capabilities[j];
1022 }
1023 if (WARN_ON(wiphy->extended_capabilities[j] &
1024 ~supported_on_all))
1025 break;
1026 }
1027 }
1028
1029 rdev->wiphy.registered = true;
1030 rtnl_unlock();
1031
1032 res = rfkill_register(rdev->wiphy.rfkill);
1033 if (res) {
1034 rfkill_destroy(rdev->wiphy.rfkill);
1035 rdev->wiphy.rfkill = NULL;
1036 wiphy_unregister(&rdev->wiphy);
1037 return res;
1038 }
1039
1040 return 0;
1041 }
1042 EXPORT_SYMBOL(wiphy_register);
1043
wiphy_rfkill_start_polling(struct wiphy * wiphy)1044 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1045 {
1046 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1047
1048 if (!rdev->ops->rfkill_poll)
1049 return;
1050 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1051 rfkill_resume_polling(wiphy->rfkill);
1052 }
1053 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1054
cfg80211_process_wiphy_works(struct cfg80211_registered_device * rdev,struct wiphy_work * end)1055 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1056 struct wiphy_work *end)
1057 {
1058 unsigned int runaway_limit = 100;
1059 unsigned long flags;
1060
1061 lockdep_assert_held(&rdev->wiphy.mtx);
1062
1063 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1064 while (!list_empty(&rdev->wiphy_work_list)) {
1065 struct wiphy_work *wk;
1066
1067 wk = list_first_entry(&rdev->wiphy_work_list,
1068 struct wiphy_work, entry);
1069 list_del_init(&wk->entry);
1070 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1071
1072 trace_wiphy_work_run(&rdev->wiphy, wk);
1073 wk->func(&rdev->wiphy, wk);
1074
1075 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1076
1077 if (wk == end)
1078 break;
1079
1080 if (WARN_ON(--runaway_limit == 0))
1081 INIT_LIST_HEAD(&rdev->wiphy_work_list);
1082 }
1083 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1084 }
1085
wiphy_unregister(struct wiphy * wiphy)1086 void wiphy_unregister(struct wiphy *wiphy)
1087 {
1088 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1089
1090 wait_event(rdev->dev_wait, ({
1091 int __count;
1092 wiphy_lock(&rdev->wiphy);
1093 __count = rdev->opencount;
1094 wiphy_unlock(&rdev->wiphy);
1095 __count == 0; }));
1096
1097 if (rdev->wiphy.rfkill)
1098 rfkill_unregister(rdev->wiphy.rfkill);
1099
1100 rtnl_lock();
1101 wiphy_lock(&rdev->wiphy);
1102 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1103 rdev->wiphy.registered = false;
1104
1105 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1106
1107 /*
1108 * First remove the hardware from everywhere, this makes
1109 * it impossible to find from userspace.
1110 */
1111 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1112 list_del_rcu(&rdev->list);
1113 synchronize_rcu();
1114
1115 /*
1116 * If this device got a regulatory hint tell core its
1117 * free to listen now to a new shiny device regulatory hint
1118 */
1119 wiphy_regulatory_deregister(wiphy);
1120
1121 cfg80211_rdev_list_generation++;
1122 device_del(&rdev->wiphy.dev);
1123
1124 #ifdef CONFIG_PM
1125 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1126 rdev_set_wakeup(rdev, false);
1127 #endif
1128
1129 /* surely nothing is reachable now, clean up work */
1130 cfg80211_process_wiphy_works(rdev, NULL);
1131 wiphy_unlock(&rdev->wiphy);
1132 rtnl_unlock();
1133
1134 /* this has nothing to do now but make sure it's gone */
1135 cancel_work_sync(&rdev->wiphy_work);
1136
1137 cancel_work_sync(&rdev->conn_work);
1138 flush_work(&rdev->event_work);
1139 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1140 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1141 flush_work(&rdev->destroy_work);
1142 flush_work(&rdev->propagate_radar_detect_wk);
1143 flush_work(&rdev->propagate_cac_done_wk);
1144 flush_work(&rdev->mgmt_registrations_update_wk);
1145 flush_work(&rdev->background_cac_abort_wk);
1146
1147 cfg80211_rdev_free_wowlan(rdev);
1148 cfg80211_free_coalesce(rdev->coalesce);
1149 rdev->coalesce = NULL;
1150 }
1151 EXPORT_SYMBOL(wiphy_unregister);
1152
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1153 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1154 {
1155 struct cfg80211_internal_bss *scan, *tmp;
1156 struct cfg80211_beacon_registration *reg, *treg;
1157 rfkill_destroy(rdev->wiphy.rfkill);
1158 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1159 list_del(®->list);
1160 kfree(reg);
1161 }
1162 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1163 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1164 mutex_destroy(&rdev->wiphy.mtx);
1165
1166 /*
1167 * The 'regd' can only be non-NULL if we never finished
1168 * initializing the wiphy and thus never went through the
1169 * unregister path - e.g. in failure scenarios. Thus, it
1170 * cannot have been visible to anyone if non-NULL, so we
1171 * can just free it here.
1172 */
1173 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1174
1175 kfree(rdev);
1176 }
1177
wiphy_free(struct wiphy * wiphy)1178 void wiphy_free(struct wiphy *wiphy)
1179 {
1180 put_device(&wiphy->dev);
1181 }
1182 EXPORT_SYMBOL(wiphy_free);
1183
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1184 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1185 enum rfkill_hard_block_reasons reason)
1186 {
1187 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1188
1189 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1190 schedule_work(&rdev->rfkill_block);
1191 }
1192 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1193
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1194 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1195 bool unregister_netdev)
1196 {
1197 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1198 struct cfg80211_cqm_config *cqm_config;
1199 unsigned int link_id;
1200
1201 ASSERT_RTNL();
1202 lockdep_assert_held(&rdev->wiphy.mtx);
1203
1204 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1205
1206 wdev->registered = false;
1207
1208 if (wdev->netdev) {
1209 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1210 if (unregister_netdev)
1211 unregister_netdevice(wdev->netdev);
1212 }
1213
1214 list_del_rcu(&wdev->list);
1215 synchronize_net();
1216 rdev->devlist_generation++;
1217
1218 cfg80211_mlme_purge_registrations(wdev);
1219
1220 switch (wdev->iftype) {
1221 case NL80211_IFTYPE_P2P_DEVICE:
1222 cfg80211_stop_p2p_device(rdev, wdev);
1223 break;
1224 case NL80211_IFTYPE_NAN:
1225 cfg80211_stop_nan(rdev, wdev);
1226 break;
1227 default:
1228 break;
1229 }
1230
1231 #ifdef CONFIG_CFG80211_WEXT
1232 kfree_sensitive(wdev->wext.keys);
1233 wdev->wext.keys = NULL;
1234 #endif
1235 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1236 /* deleted from the list, so can't be found from nl80211 any more */
1237 cqm_config = rcu_access_pointer(wdev->cqm_config);
1238 kfree_rcu(cqm_config, rcu_head);
1239
1240 /*
1241 * Ensure that all events have been processed and
1242 * freed.
1243 */
1244 cfg80211_process_wdev_events(wdev);
1245
1246 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1247 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1248 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1249 struct cfg80211_internal_bss *curbss;
1250
1251 curbss = wdev->links[link_id].client.current_bss;
1252
1253 if (WARN_ON(curbss)) {
1254 cfg80211_unhold_bss(curbss);
1255 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1256 wdev->links[link_id].client.current_bss = NULL;
1257 }
1258 }
1259 }
1260
1261 wdev->connected = false;
1262 }
1263
cfg80211_unregister_wdev(struct wireless_dev * wdev)1264 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1265 {
1266 _cfg80211_unregister_wdev(wdev, true);
1267 }
1268 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1269
1270 static const struct device_type wiphy_type = {
1271 .name = "wlan",
1272 };
1273
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1274 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1275 enum nl80211_iftype iftype, int num)
1276 {
1277 lockdep_assert_held(&rdev->wiphy.mtx);
1278
1279 rdev->num_running_ifaces += num;
1280 if (iftype == NL80211_IFTYPE_MONITOR)
1281 rdev->num_running_monitor_ifaces += num;
1282 }
1283
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1284 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1285 struct wireless_dev *wdev)
1286 {
1287 struct net_device *dev = wdev->netdev;
1288 struct cfg80211_sched_scan_request *pos, *tmp;
1289
1290 lockdep_assert_held(&rdev->wiphy.mtx);
1291
1292 cfg80211_pmsr_wdev_down(wdev);
1293
1294 cfg80211_stop_background_radar_detection(wdev);
1295
1296 switch (wdev->iftype) {
1297 case NL80211_IFTYPE_ADHOC:
1298 cfg80211_leave_ibss(rdev, dev, true);
1299 break;
1300 case NL80211_IFTYPE_P2P_CLIENT:
1301 case NL80211_IFTYPE_STATION:
1302 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1303 list) {
1304 if (dev == pos->dev)
1305 cfg80211_stop_sched_scan_req(rdev, pos, false);
1306 }
1307
1308 #ifdef CONFIG_CFG80211_WEXT
1309 kfree(wdev->wext.ie);
1310 wdev->wext.ie = NULL;
1311 wdev->wext.ie_len = 0;
1312 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1313 #endif
1314 cfg80211_disconnect(rdev, dev,
1315 WLAN_REASON_DEAUTH_LEAVING, true);
1316 break;
1317 case NL80211_IFTYPE_MESH_POINT:
1318 cfg80211_leave_mesh(rdev, dev);
1319 break;
1320 case NL80211_IFTYPE_AP:
1321 case NL80211_IFTYPE_P2P_GO:
1322 cfg80211_stop_ap(rdev, dev, -1, true);
1323 break;
1324 case NL80211_IFTYPE_OCB:
1325 cfg80211_leave_ocb(rdev, dev);
1326 break;
1327 case NL80211_IFTYPE_P2P_DEVICE:
1328 case NL80211_IFTYPE_NAN:
1329 /* cannot happen, has no netdev */
1330 break;
1331 case NL80211_IFTYPE_AP_VLAN:
1332 case NL80211_IFTYPE_MONITOR:
1333 /* nothing to do */
1334 break;
1335 case NL80211_IFTYPE_UNSPECIFIED:
1336 case NL80211_IFTYPE_WDS:
1337 case NUM_NL80211_IFTYPES:
1338 /* invalid */
1339 break;
1340 }
1341 }
1342
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1343 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1344 gfp_t gfp)
1345 {
1346 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1347 struct cfg80211_event *ev;
1348 unsigned long flags;
1349
1350 trace_cfg80211_stop_iface(wiphy, wdev);
1351
1352 ev = kzalloc(sizeof(*ev), gfp);
1353 if (!ev)
1354 return;
1355
1356 ev->type = EVENT_STOPPED;
1357
1358 spin_lock_irqsave(&wdev->event_lock, flags);
1359 list_add_tail(&ev->list, &wdev->event_list);
1360 spin_unlock_irqrestore(&wdev->event_lock, flags);
1361 queue_work(cfg80211_wq, &rdev->event_work);
1362 }
1363 EXPORT_SYMBOL(cfg80211_stop_iface);
1364
cfg80211_init_wdev(struct wireless_dev * wdev)1365 void cfg80211_init_wdev(struct wireless_dev *wdev)
1366 {
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->netns_local = true;
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 switch (wdev->iftype) {
1532 #ifdef CONFIG_CFG80211_WEXT
1533 case NL80211_IFTYPE_ADHOC:
1534 cfg80211_ibss_wext_join(rdev, wdev);
1535 break;
1536 case NL80211_IFTYPE_STATION:
1537 cfg80211_mgd_wext_connect(rdev, wdev);
1538 break;
1539 #endif
1540 #ifdef CONFIG_MAC80211_MESH
1541 case NL80211_IFTYPE_MESH_POINT:
1542 {
1543 /* backward compat code... */
1544 struct mesh_setup setup;
1545 memcpy(&setup, &default_mesh_setup,
1546 sizeof(setup));
1547 /* back compat only needed for mesh_id */
1548 setup.mesh_id = wdev->u.mesh.id;
1549 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1550 if (wdev->u.mesh.id_up_len)
1551 __cfg80211_join_mesh(rdev, dev,
1552 &setup,
1553 &default_mesh_config);
1554 break;
1555 }
1556 #endif
1557 default:
1558 break;
1559 }
1560 rdev->opencount++;
1561
1562 /*
1563 * Configure power management to the driver here so that its
1564 * correctly set also after interface type changes etc.
1565 */
1566 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1567 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1568 rdev->ops->set_power_mgmt &&
1569 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1570 wdev->ps_timeout)) {
1571 /* assume this means it's off */
1572 wdev->ps = false;
1573 }
1574 wiphy_unlock(&rdev->wiphy);
1575 break;
1576 case NETDEV_PRE_UP:
1577 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1578 wdev->use_4addr, 0))
1579 return notifier_from_errno(-EOPNOTSUPP);
1580
1581 if (rfkill_blocked(rdev->wiphy.rfkill))
1582 return notifier_from_errno(-ERFKILL);
1583 break;
1584 default:
1585 return NOTIFY_DONE;
1586 }
1587
1588 wireless_nlevent_flush();
1589
1590 return NOTIFY_OK;
1591 }
1592
1593 static struct notifier_block cfg80211_netdev_notifier = {
1594 .notifier_call = cfg80211_netdev_notifier_call,
1595 };
1596
cfg80211_pernet_exit(struct net * net)1597 static void __net_exit cfg80211_pernet_exit(struct net *net)
1598 {
1599 struct cfg80211_registered_device *rdev;
1600
1601 rtnl_lock();
1602 for_each_rdev(rdev) {
1603 if (net_eq(wiphy_net(&rdev->wiphy), net))
1604 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1605 }
1606 rtnl_unlock();
1607 }
1608
1609 static struct pernet_operations cfg80211_pernet_ops = {
1610 .exit = cfg80211_pernet_exit,
1611 };
1612
wiphy_work_queue(struct wiphy * wiphy,struct wiphy_work * work)1613 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1614 {
1615 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1616 unsigned long flags;
1617
1618 trace_wiphy_work_queue(wiphy, work);
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 trace_wiphy_work_cancel(wiphy, work);
1637
1638 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1639 if (!list_empty(&work->entry))
1640 list_del_init(&work->entry);
1641 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1642 }
1643 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1644
wiphy_work_flush(struct wiphy * wiphy,struct wiphy_work * work)1645 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1646 {
1647 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1648 unsigned long flags;
1649 bool run;
1650
1651 trace_wiphy_work_flush(wiphy, work);
1652
1653 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1654 run = !work || !list_empty(&work->entry);
1655 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1656
1657 if (run)
1658 cfg80211_process_wiphy_works(rdev, work);
1659 }
1660 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1661
wiphy_delayed_work_timer(struct timer_list * t)1662 void wiphy_delayed_work_timer(struct timer_list *t)
1663 {
1664 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1665
1666 wiphy_work_queue(dwork->wiphy, &dwork->work);
1667 }
1668 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1669
wiphy_delayed_work_queue(struct wiphy * wiphy,struct wiphy_delayed_work * dwork,unsigned long delay)1670 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1671 struct wiphy_delayed_work *dwork,
1672 unsigned long delay)
1673 {
1674 trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay);
1675
1676 if (!delay) {
1677 del_timer(&dwork->timer);
1678 wiphy_work_queue(wiphy, &dwork->work);
1679 return;
1680 }
1681
1682 dwork->wiphy = wiphy;
1683 mod_timer(&dwork->timer, jiffies + delay);
1684 }
1685 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1686
wiphy_delayed_work_cancel(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1687 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1688 struct wiphy_delayed_work *dwork)
1689 {
1690 lockdep_assert_held(&wiphy->mtx);
1691
1692 del_timer_sync(&dwork->timer);
1693 wiphy_work_cancel(wiphy, &dwork->work);
1694 }
1695 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1696
wiphy_delayed_work_flush(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1697 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1698 struct wiphy_delayed_work *dwork)
1699 {
1700 lockdep_assert_held(&wiphy->mtx);
1701
1702 del_timer_sync(&dwork->timer);
1703 wiphy_work_flush(wiphy, &dwork->work);
1704 }
1705 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1706
cfg80211_init(void)1707 static int __init cfg80211_init(void)
1708 {
1709 int err;
1710
1711 err = register_pernet_device(&cfg80211_pernet_ops);
1712 if (err)
1713 goto out_fail_pernet;
1714
1715 err = wiphy_sysfs_init();
1716 if (err)
1717 goto out_fail_sysfs;
1718
1719 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1720 if (err)
1721 goto out_fail_notifier;
1722
1723 err = nl80211_init();
1724 if (err)
1725 goto out_fail_nl80211;
1726
1727 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1728
1729 err = regulatory_init();
1730 if (err)
1731 goto out_fail_reg;
1732
1733 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1734 if (!cfg80211_wq) {
1735 err = -ENOMEM;
1736 goto out_fail_wq;
1737 }
1738
1739 return 0;
1740
1741 out_fail_wq:
1742 regulatory_exit();
1743 out_fail_reg:
1744 debugfs_remove(ieee80211_debugfs_dir);
1745 nl80211_exit();
1746 out_fail_nl80211:
1747 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1748 out_fail_notifier:
1749 wiphy_sysfs_exit();
1750 out_fail_sysfs:
1751 unregister_pernet_device(&cfg80211_pernet_ops);
1752 out_fail_pernet:
1753 return err;
1754 }
1755 fs_initcall(cfg80211_init);
1756
cfg80211_exit(void)1757 static void __exit cfg80211_exit(void)
1758 {
1759 debugfs_remove(ieee80211_debugfs_dir);
1760 nl80211_exit();
1761 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1762 wiphy_sysfs_exit();
1763 regulatory_exit();
1764 unregister_pernet_device(&cfg80211_pernet_ops);
1765 destroy_workqueue(cfg80211_wq);
1766 }
1767 module_exit(cfg80211_exit);
1768