1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This is the linux wireless configuration interface.
4 *
5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2015-2017 Intel Deutschland GmbH
8 * Copyright (C) 2018-2022 Intel Corporation
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/if.h>
14 #include <linux/module.h>
15 #include <linux/err.h>
16 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/nl80211.h>
19 #include <linux/debugfs.h>
20 #include <linux/notifier.h>
21 #include <linux/device.h>
22 #include <linux/etherdevice.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/sched.h>
25 #include <net/genetlink.h>
26 #include <net/cfg80211.h>
27 #include "nl80211.h"
28 #include "core.h"
29 #include "sysfs.h"
30 #include "debugfs.h"
31 #include "wext-compat.h"
32 #include "rdev-ops.h"
33
34 /* name for sysfs, %d is appended */
35 #define PHY_NAME "phy"
36
37 MODULE_AUTHOR("Johannes Berg");
38 MODULE_LICENSE("GPL");
39 MODULE_DESCRIPTION("wireless configuration support");
40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
41
42 /* RCU-protected (and RTNL for writers) */
43 LIST_HEAD(cfg80211_rdev_list);
44 int cfg80211_rdev_list_generation;
45
46 /* for debugfs */
47 static struct dentry *ieee80211_debugfs_dir;
48
49 /* for the cleanup, scan and event works */
50 struct workqueue_struct *cfg80211_wq;
51
52 static bool cfg80211_disable_40mhz_24ghz;
53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
55 "Disable 40MHz support in the 2.4GHz band");
56
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
58 {
59 struct cfg80211_registered_device *result = NULL, *rdev;
60
61 ASSERT_RTNL();
62
63 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
64 if (rdev->wiphy_idx == wiphy_idx) {
65 result = rdev;
66 break;
67 }
68 }
69
70 return result;
71 }
72
get_wiphy_idx(struct wiphy * wiphy)73 int get_wiphy_idx(struct wiphy *wiphy)
74 {
75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
76
77 return rdev->wiphy_idx;
78 }
79
wiphy_idx_to_wiphy(int wiphy_idx)80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
81 {
82 struct cfg80211_registered_device *rdev;
83
84 ASSERT_RTNL();
85
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
87 if (!rdev)
88 return NULL;
89 return &rdev->wiphy;
90 }
91
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
93 const char *newname)
94 {
95 struct cfg80211_registered_device *rdev2;
96 int wiphy_idx, taken = -1, digits;
97
98 ASSERT_RTNL();
99
100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
101 return -EINVAL;
102
103 /* prohibit calling the thing phy%d when %d is not its number */
104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
106 /* count number of places needed to print wiphy_idx */
107 digits = 1;
108 while (wiphy_idx /= 10)
109 digits++;
110 /*
111 * deny the name if it is phy<idx> where <idx> is printed
112 * without leading zeroes. taken == strlen(newname) here
113 */
114 if (taken == strlen(PHY_NAME) + digits)
115 return -EINVAL;
116 }
117
118 /* Ensure another device does not already have this name. */
119 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
121 return -EINVAL;
122
123 return 0;
124 }
125
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
127 char *newname)
128 {
129 int result;
130
131 ASSERT_RTNL();
132 lockdep_assert_wiphy(&rdev->wiphy);
133
134 /* Ignore nop renames */
135 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
136 return 0;
137
138 result = cfg80211_dev_check_name(rdev, newname);
139 if (result < 0)
140 return result;
141
142 result = device_rename(&rdev->wiphy.dev, newname);
143 if (result)
144 return result;
145
146 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
147 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
148 rdev->wiphy.debugfsdir,
149 rdev->wiphy.debugfsdir->d_parent, newname);
150
151 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
152
153 return 0;
154 }
155
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
157 struct net *net)
158 {
159 struct wireless_dev *wdev;
160 int err = 0;
161
162 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
163 return -EOPNOTSUPP;
164
165 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
166 if (!wdev->netdev)
167 continue;
168 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
170 if (err)
171 break;
172 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
173 }
174
175 if (err) {
176 /* failed -- clean up to old netns */
177 net = wiphy_net(&rdev->wiphy);
178
179 list_for_each_entry_continue_reverse(wdev,
180 &rdev->wiphy.wdev_list,
181 list) {
182 if (!wdev->netdev)
183 continue;
184 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
185 err = dev_change_net_namespace(wdev->netdev, net,
186 "wlan%d");
187 WARN_ON(err);
188 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
189 }
190
191 return err;
192 }
193
194 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
195 if (!wdev->netdev)
196 continue;
197 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
198 }
199
200 wiphy_lock(&rdev->wiphy);
201 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
202
203 wiphy_net_set(&rdev->wiphy, net);
204
205 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
206 WARN_ON(err);
207
208 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
209 wiphy_unlock(&rdev->wiphy);
210
211 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
212 if (!wdev->netdev)
213 continue;
214 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
215 }
216
217 return 0;
218 }
219
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
221 {
222 struct cfg80211_registered_device *rdev = data;
223
224 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 u16 types = 0;
827 bool have_he = false;
828
829 sband = wiphy->bands[band];
830 if (!sband)
831 continue;
832
833 sband->band = band;
834 if (WARN_ON(!sband->n_channels))
835 return -EINVAL;
836 /*
837 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
838 * n_bitrates is 0
839 */
840 if (WARN_ON((band != NL80211_BAND_60GHZ &&
841 band != NL80211_BAND_S1GHZ) &&
842 !sband->n_bitrates))
843 return -EINVAL;
844
845 if (WARN_ON(band == NL80211_BAND_6GHZ &&
846 (sband->ht_cap.ht_supported ||
847 sband->vht_cap.vht_supported)))
848 return -EINVAL;
849
850 /*
851 * Since cfg80211_disable_40mhz_24ghz is global, we can
852 * modify the sband's ht data even if the driver uses a
853 * global structure for that.
854 */
855 if (cfg80211_disable_40mhz_24ghz &&
856 band == NL80211_BAND_2GHZ &&
857 sband->ht_cap.ht_supported) {
858 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
859 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
860 }
861
862 /*
863 * Since we use a u32 for rate bitmaps in
864 * ieee80211_get_response_rate, we cannot
865 * have more than 32 legacy rates.
866 */
867 if (WARN_ON(sband->n_bitrates > 32))
868 return -EINVAL;
869
870 for (i = 0; i < sband->n_channels; i++) {
871 sband->channels[i].orig_flags =
872 sband->channels[i].flags;
873 sband->channels[i].orig_mag = INT_MAX;
874 sband->channels[i].orig_mpwr =
875 sband->channels[i].max_power;
876 sband->channels[i].band = band;
877
878 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
879 return -EINVAL;
880 }
881
882 for (i = 0; i < sband->n_iftype_data; i++) {
883 const struct ieee80211_sband_iftype_data *iftd;
884 bool has_ap, has_non_ap;
885 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
886 BIT(NL80211_IFTYPE_P2P_GO);
887
888 iftd = &sband->iftype_data[i];
889
890 if (WARN_ON(!iftd->types_mask))
891 return -EINVAL;
892 if (WARN_ON(types & iftd->types_mask))
893 return -EINVAL;
894
895 /* at least one piece of information must be present */
896 if (WARN_ON(!iftd->he_cap.has_he))
897 return -EINVAL;
898
899 types |= iftd->types_mask;
900
901 if (i == 0)
902 have_he = iftd->he_cap.has_he;
903 else
904 have_he = have_he &&
905 iftd->he_cap.has_he;
906
907 has_ap = iftd->types_mask & ap_bits;
908 has_non_ap = iftd->types_mask & ~ap_bits;
909
910 /*
911 * For EHT 20 MHz STA, the capabilities format differs
912 * but to simplify, don't check 20 MHz but rather check
913 * only if AP and non-AP were mentioned at the same time,
914 * reject if so.
915 */
916 if (WARN_ON(iftd->eht_cap.has_eht &&
917 has_ap && has_non_ap))
918 return -EINVAL;
919 }
920
921 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
922 return -EINVAL;
923
924 have_band = true;
925 }
926
927 if (!have_band) {
928 WARN_ON(1);
929 return -EINVAL;
930 }
931
932 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
933 /*
934 * Validate we have a policy (can be explicitly set to
935 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
936 * we have at least one of doit/dumpit.
937 */
938 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
939 return -EINVAL;
940 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
941 !rdev->wiphy.vendor_commands[i].dumpit))
942 return -EINVAL;
943 }
944
945 #ifdef CONFIG_PM
946 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
947 (!rdev->wiphy.wowlan->pattern_min_len ||
948 rdev->wiphy.wowlan->pattern_min_len >
949 rdev->wiphy.wowlan->pattern_max_len)))
950 return -EINVAL;
951 #endif
952
953 if (!wiphy->max_num_akm_suites)
954 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
955 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
956 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
957 return -EINVAL;
958
959 /* check and set up bitrates */
960 ieee80211_set_bitrate_flags(wiphy);
961
962 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
963
964 rtnl_lock();
965 wiphy_lock(&rdev->wiphy);
966 res = device_add(&rdev->wiphy.dev);
967 if (res) {
968 wiphy_unlock(&rdev->wiphy);
969 rtnl_unlock();
970 return res;
971 }
972
973 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
974 cfg80211_rdev_list_generation++;
975
976 /* add to debugfs */
977 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
978 ieee80211_debugfs_dir);
979
980 cfg80211_debugfs_rdev_add(rdev);
981 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
982 wiphy_unlock(&rdev->wiphy);
983
984 /* set up regulatory info */
985 wiphy_regulatory_register(wiphy);
986
987 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
988 struct regulatory_request request;
989
990 request.wiphy_idx = get_wiphy_idx(wiphy);
991 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
992 request.alpha2[0] = '9';
993 request.alpha2[1] = '9';
994
995 nl80211_send_reg_change_event(&request);
996 }
997
998 /* Check that nobody globally advertises any capabilities they do not
999 * advertise on all possible interface types.
1000 */
1001 if (wiphy->extended_capabilities_len &&
1002 wiphy->num_iftype_ext_capab &&
1003 wiphy->iftype_ext_capab) {
1004 u8 supported_on_all, j;
1005 const struct wiphy_iftype_ext_capab *capab;
1006
1007 capab = wiphy->iftype_ext_capab;
1008 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1009 if (capab[0].extended_capabilities_len > j)
1010 supported_on_all =
1011 capab[0].extended_capabilities[j];
1012 else
1013 supported_on_all = 0x00;
1014 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1015 if (j >= capab[i].extended_capabilities_len) {
1016 supported_on_all = 0x00;
1017 break;
1018 }
1019 supported_on_all &=
1020 capab[i].extended_capabilities[j];
1021 }
1022 if (WARN_ON(wiphy->extended_capabilities[j] &
1023 ~supported_on_all))
1024 break;
1025 }
1026 }
1027
1028 rdev->wiphy.registered = true;
1029 rtnl_unlock();
1030
1031 res = rfkill_register(rdev->wiphy.rfkill);
1032 if (res) {
1033 rfkill_destroy(rdev->wiphy.rfkill);
1034 rdev->wiphy.rfkill = NULL;
1035 wiphy_unregister(&rdev->wiphy);
1036 return res;
1037 }
1038
1039 return 0;
1040 }
1041 EXPORT_SYMBOL(wiphy_register);
1042
wiphy_rfkill_start_polling(struct wiphy * wiphy)1043 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1044 {
1045 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1046
1047 if (!rdev->ops->rfkill_poll)
1048 return;
1049 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1050 rfkill_resume_polling(wiphy->rfkill);
1051 }
1052 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1053
cfg80211_process_wiphy_works(struct cfg80211_registered_device * rdev,struct wiphy_work * end)1054 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1055 struct wiphy_work *end)
1056 {
1057 unsigned int runaway_limit = 100;
1058 unsigned long flags;
1059
1060 lockdep_assert_held(&rdev->wiphy.mtx);
1061
1062 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1063 while (!list_empty(&rdev->wiphy_work_list)) {
1064 struct wiphy_work *wk;
1065
1066 wk = list_first_entry(&rdev->wiphy_work_list,
1067 struct wiphy_work, entry);
1068 list_del_init(&wk->entry);
1069 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1070
1071 wk->func(&rdev->wiphy, wk);
1072
1073 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1074
1075 if (wk == end)
1076 break;
1077
1078 if (WARN_ON(--runaway_limit == 0))
1079 INIT_LIST_HEAD(&rdev->wiphy_work_list);
1080 }
1081 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1082 }
1083
wiphy_unregister(struct wiphy * wiphy)1084 void wiphy_unregister(struct wiphy *wiphy)
1085 {
1086 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1087
1088 wait_event(rdev->dev_wait, ({
1089 int __count;
1090 wiphy_lock(&rdev->wiphy);
1091 __count = rdev->opencount;
1092 wiphy_unlock(&rdev->wiphy);
1093 __count == 0; }));
1094
1095 if (rdev->wiphy.rfkill)
1096 rfkill_unregister(rdev->wiphy.rfkill);
1097
1098 rtnl_lock();
1099 wiphy_lock(&rdev->wiphy);
1100 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1101 rdev->wiphy.registered = false;
1102
1103 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1104
1105 /*
1106 * First remove the hardware from everywhere, this makes
1107 * it impossible to find from userspace.
1108 */
1109 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1110 list_del_rcu(&rdev->list);
1111 synchronize_rcu();
1112
1113 /*
1114 * If this device got a regulatory hint tell core its
1115 * free to listen now to a new shiny device regulatory hint
1116 */
1117 wiphy_regulatory_deregister(wiphy);
1118
1119 cfg80211_rdev_list_generation++;
1120 device_del(&rdev->wiphy.dev);
1121
1122 #ifdef CONFIG_PM
1123 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1124 rdev_set_wakeup(rdev, false);
1125 #endif
1126
1127 /* surely nothing is reachable now, clean up work */
1128 cfg80211_process_wiphy_works(rdev, NULL);
1129 wiphy_unlock(&rdev->wiphy);
1130 rtnl_unlock();
1131
1132 /* this has nothing to do now but make sure it's gone */
1133 cancel_work_sync(&rdev->wiphy_work);
1134
1135 cancel_work_sync(&rdev->conn_work);
1136 flush_work(&rdev->event_work);
1137 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1138 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1139 flush_work(&rdev->destroy_work);
1140 flush_work(&rdev->propagate_radar_detect_wk);
1141 flush_work(&rdev->propagate_cac_done_wk);
1142 flush_work(&rdev->mgmt_registrations_update_wk);
1143 flush_work(&rdev->background_cac_abort_wk);
1144
1145 cfg80211_rdev_free_wowlan(rdev);
1146 cfg80211_rdev_free_coalesce(rdev);
1147 }
1148 EXPORT_SYMBOL(wiphy_unregister);
1149
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1150 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1151 {
1152 struct cfg80211_internal_bss *scan, *tmp;
1153 struct cfg80211_beacon_registration *reg, *treg;
1154 rfkill_destroy(rdev->wiphy.rfkill);
1155 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1156 list_del(®->list);
1157 kfree(reg);
1158 }
1159 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1160 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1161 mutex_destroy(&rdev->wiphy.mtx);
1162
1163 /*
1164 * The 'regd' can only be non-NULL if we never finished
1165 * initializing the wiphy and thus never went through the
1166 * unregister path - e.g. in failure scenarios. Thus, it
1167 * cannot have been visible to anyone if non-NULL, so we
1168 * can just free it here.
1169 */
1170 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1171
1172 kfree(rdev);
1173 }
1174
wiphy_free(struct wiphy * wiphy)1175 void wiphy_free(struct wiphy *wiphy)
1176 {
1177 put_device(&wiphy->dev);
1178 }
1179 EXPORT_SYMBOL(wiphy_free);
1180
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1181 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1182 enum rfkill_hard_block_reasons reason)
1183 {
1184 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1185
1186 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1187 schedule_work(&rdev->rfkill_block);
1188 }
1189 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1190
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1191 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1192 bool unregister_netdev)
1193 {
1194 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1195 struct cfg80211_cqm_config *cqm_config;
1196 unsigned int link_id;
1197
1198 ASSERT_RTNL();
1199 lockdep_assert_held(&rdev->wiphy.mtx);
1200
1201 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1202
1203 wdev->registered = false;
1204
1205 if (wdev->netdev) {
1206 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1207 if (unregister_netdev)
1208 unregister_netdevice(wdev->netdev);
1209 }
1210
1211 list_del_rcu(&wdev->list);
1212 synchronize_net();
1213 rdev->devlist_generation++;
1214
1215 cfg80211_mlme_purge_registrations(wdev);
1216
1217 switch (wdev->iftype) {
1218 case NL80211_IFTYPE_P2P_DEVICE:
1219 cfg80211_stop_p2p_device(rdev, wdev);
1220 break;
1221 case NL80211_IFTYPE_NAN:
1222 cfg80211_stop_nan(rdev, wdev);
1223 break;
1224 default:
1225 break;
1226 }
1227
1228 #ifdef CONFIG_CFG80211_WEXT
1229 kfree_sensitive(wdev->wext.keys);
1230 wdev->wext.keys = NULL;
1231 #endif
1232 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1233 /* deleted from the list, so can't be found from nl80211 any more */
1234 cqm_config = rcu_access_pointer(wdev->cqm_config);
1235 kfree_rcu(cqm_config, rcu_head);
1236
1237 /*
1238 * Ensure that all events have been processed and
1239 * freed.
1240 */
1241 cfg80211_process_wdev_events(wdev);
1242
1243 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1244 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1245 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1246 struct cfg80211_internal_bss *curbss;
1247
1248 curbss = wdev->links[link_id].client.current_bss;
1249
1250 if (WARN_ON(curbss)) {
1251 cfg80211_unhold_bss(curbss);
1252 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1253 wdev->links[link_id].client.current_bss = NULL;
1254 }
1255 }
1256 }
1257
1258 wdev->connected = false;
1259 }
1260
cfg80211_unregister_wdev(struct wireless_dev * wdev)1261 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1262 {
1263 _cfg80211_unregister_wdev(wdev, true);
1264 }
1265 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1266
1267 static const struct device_type wiphy_type = {
1268 .name = "wlan",
1269 };
1270
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1271 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1272 enum nl80211_iftype iftype, int num)
1273 {
1274 lockdep_assert_held(&rdev->wiphy.mtx);
1275
1276 rdev->num_running_ifaces += num;
1277 if (iftype == NL80211_IFTYPE_MONITOR)
1278 rdev->num_running_monitor_ifaces += num;
1279 }
1280
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1281 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1282 struct wireless_dev *wdev)
1283 {
1284 struct net_device *dev = wdev->netdev;
1285 struct cfg80211_sched_scan_request *pos, *tmp;
1286
1287 lockdep_assert_held(&rdev->wiphy.mtx);
1288 ASSERT_WDEV_LOCK(wdev);
1289
1290 cfg80211_pmsr_wdev_down(wdev);
1291
1292 cfg80211_stop_background_radar_detection(wdev);
1293
1294 switch (wdev->iftype) {
1295 case NL80211_IFTYPE_ADHOC:
1296 __cfg80211_leave_ibss(rdev, dev, true);
1297 break;
1298 case NL80211_IFTYPE_P2P_CLIENT:
1299 case NL80211_IFTYPE_STATION:
1300 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1301 list) {
1302 if (dev == pos->dev)
1303 cfg80211_stop_sched_scan_req(rdev, pos, false);
1304 }
1305
1306 #ifdef CONFIG_CFG80211_WEXT
1307 kfree(wdev->wext.ie);
1308 wdev->wext.ie = NULL;
1309 wdev->wext.ie_len = 0;
1310 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1311 #endif
1312 cfg80211_disconnect(rdev, dev,
1313 WLAN_REASON_DEAUTH_LEAVING, true);
1314 break;
1315 case NL80211_IFTYPE_MESH_POINT:
1316 __cfg80211_leave_mesh(rdev, dev);
1317 break;
1318 case NL80211_IFTYPE_AP:
1319 case NL80211_IFTYPE_P2P_GO:
1320 __cfg80211_stop_ap(rdev, dev, -1, true);
1321 break;
1322 case NL80211_IFTYPE_OCB:
1323 __cfg80211_leave_ocb(rdev, dev);
1324 break;
1325 case NL80211_IFTYPE_P2P_DEVICE:
1326 case NL80211_IFTYPE_NAN:
1327 /* cannot happen, has no netdev */
1328 break;
1329 case NL80211_IFTYPE_AP_VLAN:
1330 case NL80211_IFTYPE_MONITOR:
1331 /* nothing to do */
1332 break;
1333 case NL80211_IFTYPE_UNSPECIFIED:
1334 case NL80211_IFTYPE_WDS:
1335 case NUM_NL80211_IFTYPES:
1336 /* invalid */
1337 break;
1338 }
1339 }
1340
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1341 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1342 struct wireless_dev *wdev)
1343 {
1344 wdev_lock(wdev);
1345 __cfg80211_leave(rdev, wdev);
1346 wdev_unlock(wdev);
1347 }
1348
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1349 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1350 gfp_t gfp)
1351 {
1352 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1353 struct cfg80211_event *ev;
1354 unsigned long flags;
1355
1356 trace_cfg80211_stop_iface(wiphy, wdev);
1357
1358 ev = kzalloc(sizeof(*ev), gfp);
1359 if (!ev)
1360 return;
1361
1362 ev->type = EVENT_STOPPED;
1363
1364 spin_lock_irqsave(&wdev->event_lock, flags);
1365 list_add_tail(&ev->list, &wdev->event_list);
1366 spin_unlock_irqrestore(&wdev->event_lock, flags);
1367 queue_work(cfg80211_wq, &rdev->event_work);
1368 }
1369 EXPORT_SYMBOL(cfg80211_stop_iface);
1370
cfg80211_init_wdev(struct wireless_dev * wdev)1371 void cfg80211_init_wdev(struct wireless_dev *wdev)
1372 {
1373 mutex_init(&wdev->mtx);
1374 INIT_LIST_HEAD(&wdev->event_list);
1375 spin_lock_init(&wdev->event_lock);
1376 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1377 INIT_LIST_HEAD(&wdev->pmsr_list);
1378 spin_lock_init(&wdev->pmsr_lock);
1379 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1380
1381 #ifdef CONFIG_CFG80211_WEXT
1382 wdev->wext.default_key = -1;
1383 wdev->wext.default_mgmt_key = -1;
1384 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1385 #endif
1386
1387 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1388
1389 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1390 wdev->ps = true;
1391 else
1392 wdev->ps = false;
1393 /* allow mac80211 to determine the timeout */
1394 wdev->ps_timeout = -1;
1395
1396 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1397 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1398 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1399 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1400
1401 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1402 }
1403
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1404 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1405 struct wireless_dev *wdev)
1406 {
1407 ASSERT_RTNL();
1408 lockdep_assert_held(&rdev->wiphy.mtx);
1409
1410 /*
1411 * We get here also when the interface changes network namespaces,
1412 * as it's registered into the new one, but we don't want it to
1413 * change ID in that case. Checking if the ID is already assigned
1414 * works, because 0 isn't considered a valid ID and the memory is
1415 * 0-initialized.
1416 */
1417 if (!wdev->identifier)
1418 wdev->identifier = ++rdev->wdev_id;
1419 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1420 rdev->devlist_generation++;
1421 wdev->registered = true;
1422
1423 if (wdev->netdev &&
1424 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1425 "phy80211"))
1426 pr_err("failed to add phy80211 symlink to netdev!\n");
1427
1428 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1429 }
1430
cfg80211_register_netdevice(struct net_device * dev)1431 int cfg80211_register_netdevice(struct net_device *dev)
1432 {
1433 struct wireless_dev *wdev = dev->ieee80211_ptr;
1434 struct cfg80211_registered_device *rdev;
1435 int ret;
1436
1437 ASSERT_RTNL();
1438
1439 if (WARN_ON(!wdev))
1440 return -EINVAL;
1441
1442 rdev = wiphy_to_rdev(wdev->wiphy);
1443
1444 lockdep_assert_held(&rdev->wiphy.mtx);
1445
1446 /* we'll take care of this */
1447 wdev->registered = true;
1448 wdev->registering = true;
1449 ret = register_netdevice(dev);
1450 if (ret)
1451 goto out;
1452
1453 cfg80211_register_wdev(rdev, wdev);
1454 ret = 0;
1455 out:
1456 wdev->registering = false;
1457 if (ret)
1458 wdev->registered = false;
1459 return ret;
1460 }
1461 EXPORT_SYMBOL(cfg80211_register_netdevice);
1462
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1463 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1464 unsigned long state, void *ptr)
1465 {
1466 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1467 struct wireless_dev *wdev = dev->ieee80211_ptr;
1468 struct cfg80211_registered_device *rdev;
1469 struct cfg80211_sched_scan_request *pos, *tmp;
1470
1471 if (!wdev)
1472 return NOTIFY_DONE;
1473
1474 rdev = wiphy_to_rdev(wdev->wiphy);
1475
1476 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1477
1478 switch (state) {
1479 case NETDEV_POST_INIT:
1480 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1481 wdev->netdev = dev;
1482 /* can only change netns with wiphy */
1483 dev->features |= NETIF_F_NETNS_LOCAL;
1484
1485 cfg80211_init_wdev(wdev);
1486 break;
1487 case NETDEV_REGISTER:
1488 if (!wdev->registered) {
1489 wiphy_lock(&rdev->wiphy);
1490 cfg80211_register_wdev(rdev, wdev);
1491 wiphy_unlock(&rdev->wiphy);
1492 }
1493 break;
1494 case NETDEV_UNREGISTER:
1495 /*
1496 * It is possible to get NETDEV_UNREGISTER multiple times,
1497 * so check wdev->registered.
1498 */
1499 if (wdev->registered && !wdev->registering) {
1500 wiphy_lock(&rdev->wiphy);
1501 _cfg80211_unregister_wdev(wdev, false);
1502 wiphy_unlock(&rdev->wiphy);
1503 }
1504 break;
1505 case NETDEV_GOING_DOWN:
1506 wiphy_lock(&rdev->wiphy);
1507 cfg80211_leave(rdev, wdev);
1508 cfg80211_remove_links(wdev);
1509 wiphy_unlock(&rdev->wiphy);
1510 /* since we just did cfg80211_leave() nothing to do there */
1511 cancel_work_sync(&wdev->disconnect_wk);
1512 cancel_work_sync(&wdev->pmsr_free_wk);
1513 break;
1514 case NETDEV_DOWN:
1515 wiphy_lock(&rdev->wiphy);
1516 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1517 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1518 if (WARN_ON(!rdev->scan_req->notified &&
1519 (!rdev->int_scan_req ||
1520 !rdev->int_scan_req->notified)))
1521 rdev->scan_req->info.aborted = true;
1522 ___cfg80211_scan_done(rdev, false);
1523 }
1524
1525 list_for_each_entry_safe(pos, tmp,
1526 &rdev->sched_scan_req_list, list) {
1527 if (WARN_ON(pos->dev == wdev->netdev))
1528 cfg80211_stop_sched_scan_req(rdev, pos, false);
1529 }
1530
1531 rdev->opencount--;
1532 wiphy_unlock(&rdev->wiphy);
1533 wake_up(&rdev->dev_wait);
1534 break;
1535 case NETDEV_UP:
1536 wiphy_lock(&rdev->wiphy);
1537 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1538 wdev_lock(wdev);
1539 switch (wdev->iftype) {
1540 #ifdef CONFIG_CFG80211_WEXT
1541 case NL80211_IFTYPE_ADHOC:
1542 cfg80211_ibss_wext_join(rdev, wdev);
1543 break;
1544 case NL80211_IFTYPE_STATION:
1545 cfg80211_mgd_wext_connect(rdev, wdev);
1546 break;
1547 #endif
1548 #ifdef CONFIG_MAC80211_MESH
1549 case NL80211_IFTYPE_MESH_POINT:
1550 {
1551 /* backward compat code... */
1552 struct mesh_setup setup;
1553 memcpy(&setup, &default_mesh_setup,
1554 sizeof(setup));
1555 /* back compat only needed for mesh_id */
1556 setup.mesh_id = wdev->u.mesh.id;
1557 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1558 if (wdev->u.mesh.id_up_len)
1559 __cfg80211_join_mesh(rdev, dev,
1560 &setup,
1561 &default_mesh_config);
1562 break;
1563 }
1564 #endif
1565 default:
1566 break;
1567 }
1568 wdev_unlock(wdev);
1569 rdev->opencount++;
1570
1571 /*
1572 * Configure power management to the driver here so that its
1573 * correctly set also after interface type changes etc.
1574 */
1575 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1576 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1577 rdev->ops->set_power_mgmt &&
1578 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1579 wdev->ps_timeout)) {
1580 /* assume this means it's off */
1581 wdev->ps = false;
1582 }
1583 wiphy_unlock(&rdev->wiphy);
1584 break;
1585 case NETDEV_PRE_UP:
1586 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1587 wdev->use_4addr, 0))
1588 return notifier_from_errno(-EOPNOTSUPP);
1589
1590 if (rfkill_blocked(rdev->wiphy.rfkill))
1591 return notifier_from_errno(-ERFKILL);
1592 break;
1593 default:
1594 return NOTIFY_DONE;
1595 }
1596
1597 wireless_nlevent_flush();
1598
1599 return NOTIFY_OK;
1600 }
1601
1602 static struct notifier_block cfg80211_netdev_notifier = {
1603 .notifier_call = cfg80211_netdev_notifier_call,
1604 };
1605
cfg80211_pernet_exit(struct net * net)1606 static void __net_exit cfg80211_pernet_exit(struct net *net)
1607 {
1608 struct cfg80211_registered_device *rdev;
1609
1610 rtnl_lock();
1611 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1612 if (net_eq(wiphy_net(&rdev->wiphy), net))
1613 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1614 }
1615 rtnl_unlock();
1616 }
1617
1618 static struct pernet_operations cfg80211_pernet_ops = {
1619 .exit = cfg80211_pernet_exit,
1620 };
1621
wiphy_work_queue(struct wiphy * wiphy,struct wiphy_work * work)1622 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1623 {
1624 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1625 unsigned long flags;
1626
1627 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1628 if (list_empty(&work->entry))
1629 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1630 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1631
1632 queue_work(system_unbound_wq, &rdev->wiphy_work);
1633 }
1634 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1635
wiphy_work_cancel(struct wiphy * wiphy,struct wiphy_work * work)1636 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1637 {
1638 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1639 unsigned long flags;
1640
1641 lockdep_assert_held(&wiphy->mtx);
1642
1643 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1644 if (!list_empty(&work->entry))
1645 list_del_init(&work->entry);
1646 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1647 }
1648 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1649
wiphy_work_flush(struct wiphy * wiphy,struct wiphy_work * work)1650 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1651 {
1652 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1653 unsigned long flags;
1654 bool run;
1655
1656 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1657 run = !work || !list_empty(&work->entry);
1658 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1659
1660 if (run)
1661 cfg80211_process_wiphy_works(rdev, work);
1662 }
1663 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1664
wiphy_delayed_work_timer(struct timer_list * t)1665 void wiphy_delayed_work_timer(struct timer_list *t)
1666 {
1667 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1668
1669 wiphy_work_queue(dwork->wiphy, &dwork->work);
1670 }
1671 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1672
wiphy_delayed_work_queue(struct wiphy * wiphy,struct wiphy_delayed_work * dwork,unsigned long delay)1673 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1674 struct wiphy_delayed_work *dwork,
1675 unsigned long delay)
1676 {
1677 if (!delay) {
1678 del_timer(&dwork->timer);
1679 wiphy_work_queue(wiphy, &dwork->work);
1680 return;
1681 }
1682
1683 dwork->wiphy = wiphy;
1684 mod_timer(&dwork->timer, jiffies + delay);
1685 }
1686 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1687
wiphy_delayed_work_cancel(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1688 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1689 struct wiphy_delayed_work *dwork)
1690 {
1691 lockdep_assert_held(&wiphy->mtx);
1692
1693 del_timer_sync(&dwork->timer);
1694 wiphy_work_cancel(wiphy, &dwork->work);
1695 }
1696 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1697
wiphy_delayed_work_flush(struct wiphy * wiphy,struct wiphy_delayed_work * dwork)1698 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1699 struct wiphy_delayed_work *dwork)
1700 {
1701 lockdep_assert_held(&wiphy->mtx);
1702
1703 del_timer_sync(&dwork->timer);
1704 wiphy_work_flush(wiphy, &dwork->work);
1705 }
1706 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1707
cfg80211_init(void)1708 static int __init cfg80211_init(void)
1709 {
1710 int err;
1711
1712 err = register_pernet_device(&cfg80211_pernet_ops);
1713 if (err)
1714 goto out_fail_pernet;
1715
1716 err = wiphy_sysfs_init();
1717 if (err)
1718 goto out_fail_sysfs;
1719
1720 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1721 if (err)
1722 goto out_fail_notifier;
1723
1724 err = nl80211_init();
1725 if (err)
1726 goto out_fail_nl80211;
1727
1728 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1729
1730 err = regulatory_init();
1731 if (err)
1732 goto out_fail_reg;
1733
1734 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1735 if (!cfg80211_wq) {
1736 err = -ENOMEM;
1737 goto out_fail_wq;
1738 }
1739
1740 return 0;
1741
1742 out_fail_wq:
1743 regulatory_exit();
1744 out_fail_reg:
1745 debugfs_remove(ieee80211_debugfs_dir);
1746 nl80211_exit();
1747 out_fail_nl80211:
1748 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1749 out_fail_notifier:
1750 wiphy_sysfs_exit();
1751 out_fail_sysfs:
1752 unregister_pernet_device(&cfg80211_pernet_ops);
1753 out_fail_pernet:
1754 return err;
1755 }
1756 fs_initcall(cfg80211_init);
1757
cfg80211_exit(void)1758 static void __exit cfg80211_exit(void)
1759 {
1760 debugfs_remove(ieee80211_debugfs_dir);
1761 nl80211_exit();
1762 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1763 wiphy_sysfs_exit();
1764 regulatory_exit();
1765 unregister_pernet_device(&cfg80211_pernet_ops);
1766 destroy_workqueue(cfg80211_wq);
1767 }
1768 module_exit(cfg80211_exit);
1769