1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This is the linux wireless configuration interface.
4 *
5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2015-2017 Intel Deutschland GmbH
8 * Copyright (C) 2018-2022 Intel Corporation
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/if.h>
14 #include <linux/module.h>
15 #include <linux/err.h>
16 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/nl80211.h>
19 #include <linux/debugfs.h>
20 #include <linux/notifier.h>
21 #include <linux/device.h>
22 #include <linux/etherdevice.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/sched.h>
25 #include <net/genetlink.h>
26 #include <net/cfg80211.h>
27 #include "nl80211.h"
28 #include "core.h"
29 #include "sysfs.h"
30 #include "debugfs.h"
31 #include "wext-compat.h"
32 #include "rdev-ops.h"
33
34 /* name for sysfs, %d is appended */
35 #define PHY_NAME "phy"
36
37 MODULE_AUTHOR("Johannes Berg");
38 MODULE_LICENSE("GPL");
39 MODULE_DESCRIPTION("wireless configuration support");
40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
41
42 /* RCU-protected (and RTNL for writers) */
43 LIST_HEAD(cfg80211_rdev_list);
44 int cfg80211_rdev_list_generation;
45
46 /* for debugfs */
47 static struct dentry *ieee80211_debugfs_dir;
48
49 /* for the cleanup, scan and event works */
50 struct workqueue_struct *cfg80211_wq;
51
52 static bool cfg80211_disable_40mhz_24ghz;
53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
55 "Disable 40MHz support in the 2.4GHz band");
56
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
58 {
59 struct cfg80211_registered_device *result = NULL, *rdev;
60
61 ASSERT_RTNL();
62
63 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
64 if (rdev->wiphy_idx == wiphy_idx) {
65 result = rdev;
66 break;
67 }
68 }
69
70 return result;
71 }
72
get_wiphy_idx(struct wiphy * wiphy)73 int get_wiphy_idx(struct wiphy *wiphy)
74 {
75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
76
77 return rdev->wiphy_idx;
78 }
79
wiphy_idx_to_wiphy(int wiphy_idx)80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
81 {
82 struct cfg80211_registered_device *rdev;
83
84 ASSERT_RTNL();
85
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
87 if (!rdev)
88 return NULL;
89 return &rdev->wiphy;
90 }
91
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
93 const char *newname)
94 {
95 struct cfg80211_registered_device *rdev2;
96 int wiphy_idx, taken = -1, digits;
97
98 ASSERT_RTNL();
99
100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
101 return -EINVAL;
102
103 /* prohibit calling the thing phy%d when %d is not its number */
104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
106 /* count number of places needed to print wiphy_idx */
107 digits = 1;
108 while (wiphy_idx /= 10)
109 digits++;
110 /*
111 * deny the name if it is phy<idx> where <idx> is printed
112 * without leading zeroes. taken == strlen(newname) here
113 */
114 if (taken == strlen(PHY_NAME) + digits)
115 return -EINVAL;
116 }
117
118 /* Ensure another device does not already have this name. */
119 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
121 return -EINVAL;
122
123 return 0;
124 }
125
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
127 char *newname)
128 {
129 int result;
130
131 ASSERT_RTNL();
132
133 /* Ignore nop renames */
134 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
135 return 0;
136
137 result = cfg80211_dev_check_name(rdev, newname);
138 if (result < 0)
139 return result;
140
141 result = device_rename(&rdev->wiphy.dev, newname);
142 if (result)
143 return result;
144
145 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
146 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
147 rdev->wiphy.debugfsdir,
148 rdev->wiphy.debugfsdir->d_parent, newname);
149
150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
151
152 return 0;
153 }
154
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
156 struct net *net)
157 {
158 struct wireless_dev *wdev;
159 int err = 0;
160
161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
162 return -EOPNOTSUPP;
163
164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
165 if (!wdev->netdev)
166 continue;
167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
169 if (err)
170 break;
171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
172 }
173
174 if (err) {
175 /* failed -- clean up to old netns */
176 net = wiphy_net(&rdev->wiphy);
177
178 list_for_each_entry_continue_reverse(wdev,
179 &rdev->wiphy.wdev_list,
180 list) {
181 if (!wdev->netdev)
182 continue;
183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
184 err = dev_change_net_namespace(wdev->netdev, net,
185 "wlan%d");
186 WARN_ON(err);
187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
188 }
189
190 return err;
191 }
192
193 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
194 if (!wdev->netdev)
195 continue;
196 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
197 }
198 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
199
200 wiphy_net_set(&rdev->wiphy, net);
201
202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
203 WARN_ON(err);
204
205 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
206 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
207 if (!wdev->netdev)
208 continue;
209 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
210 }
211
212 return 0;
213 }
214
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
216 {
217 struct cfg80211_registered_device *rdev = data;
218
219 wiphy_lock(&rdev->wiphy);
220 rdev_rfkill_poll(rdev);
221 wiphy_unlock(&rdev->wiphy);
222 }
223
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)224 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
225 struct wireless_dev *wdev)
226 {
227 lockdep_assert_held(&rdev->wiphy.mtx);
228
229 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
230 return;
231
232 if (!wdev_running(wdev))
233 return;
234
235 rdev_stop_p2p_device(rdev, wdev);
236 wdev->is_running = false;
237
238 rdev->opencount--;
239
240 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
241 if (WARN_ON(!rdev->scan_req->notified &&
242 (!rdev->int_scan_req ||
243 !rdev->int_scan_req->notified)))
244 rdev->scan_req->info.aborted = true;
245 ___cfg80211_scan_done(rdev, false);
246 }
247 }
248
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)249 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
250 struct wireless_dev *wdev)
251 {
252 lockdep_assert_held(&rdev->wiphy.mtx);
253
254 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
255 return;
256
257 if (!wdev_running(wdev))
258 return;
259
260 rdev_stop_nan(rdev, wdev);
261 wdev->is_running = false;
262
263 rdev->opencount--;
264 }
265
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)266 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
267 {
268 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
269 struct wireless_dev *wdev;
270
271 ASSERT_RTNL();
272
273 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
274 if (wdev->netdev) {
275 dev_close(wdev->netdev);
276 continue;
277 }
278
279 /* otherwise, check iftype */
280
281 wiphy_lock(wiphy);
282
283 switch (wdev->iftype) {
284 case NL80211_IFTYPE_P2P_DEVICE:
285 cfg80211_stop_p2p_device(rdev, wdev);
286 break;
287 case NL80211_IFTYPE_NAN:
288 cfg80211_stop_nan(rdev, wdev);
289 break;
290 default:
291 break;
292 }
293
294 wiphy_unlock(wiphy);
295 }
296 }
297 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
298
cfg80211_rfkill_set_block(void * data,bool blocked)299 static int cfg80211_rfkill_set_block(void *data, bool blocked)
300 {
301 struct cfg80211_registered_device *rdev = data;
302
303 if (!blocked)
304 return 0;
305
306 rtnl_lock();
307 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
308 rtnl_unlock();
309
310 return 0;
311 }
312
cfg80211_rfkill_block_work(struct work_struct * work)313 static void cfg80211_rfkill_block_work(struct work_struct *work)
314 {
315 struct cfg80211_registered_device *rdev;
316
317 rdev = container_of(work, struct cfg80211_registered_device,
318 rfkill_block);
319 cfg80211_rfkill_set_block(rdev, true);
320 }
321
cfg80211_event_work(struct work_struct * work)322 static void cfg80211_event_work(struct work_struct *work)
323 {
324 struct cfg80211_registered_device *rdev;
325
326 rdev = container_of(work, struct cfg80211_registered_device,
327 event_work);
328
329 wiphy_lock(&rdev->wiphy);
330 cfg80211_process_rdev_events(rdev);
331 wiphy_unlock(&rdev->wiphy);
332 }
333
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)334 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
335 {
336 struct wireless_dev *wdev, *tmp;
337
338 ASSERT_RTNL();
339
340 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
341 if (wdev->nl_owner_dead) {
342 if (wdev->netdev)
343 dev_close(wdev->netdev);
344
345 wiphy_lock(&rdev->wiphy);
346 cfg80211_leave(rdev, wdev);
347 cfg80211_remove_virtual_intf(rdev, wdev);
348 wiphy_unlock(&rdev->wiphy);
349 }
350 }
351 }
352
cfg80211_destroy_iface_wk(struct work_struct * work)353 static void cfg80211_destroy_iface_wk(struct work_struct *work)
354 {
355 struct cfg80211_registered_device *rdev;
356
357 rdev = container_of(work, struct cfg80211_registered_device,
358 destroy_work);
359
360 rtnl_lock();
361 cfg80211_destroy_ifaces(rdev);
362 rtnl_unlock();
363 }
364
cfg80211_sched_scan_stop_wk(struct work_struct * work)365 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
366 {
367 struct cfg80211_registered_device *rdev;
368 struct cfg80211_sched_scan_request *req, *tmp;
369
370 rdev = container_of(work, struct cfg80211_registered_device,
371 sched_scan_stop_wk);
372
373 wiphy_lock(&rdev->wiphy);
374 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
375 if (req->nl_owner_dead)
376 cfg80211_stop_sched_scan_req(rdev, req, false);
377 }
378 wiphy_unlock(&rdev->wiphy);
379 }
380
cfg80211_propagate_radar_detect_wk(struct work_struct * work)381 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
382 {
383 struct cfg80211_registered_device *rdev;
384
385 rdev = container_of(work, struct cfg80211_registered_device,
386 propagate_radar_detect_wk);
387
388 rtnl_lock();
389
390 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
391 NL80211_DFS_UNAVAILABLE,
392 NL80211_RADAR_DETECTED);
393
394 rtnl_unlock();
395 }
396
cfg80211_propagate_cac_done_wk(struct work_struct * work)397 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
398 {
399 struct cfg80211_registered_device *rdev;
400
401 rdev = container_of(work, struct cfg80211_registered_device,
402 propagate_cac_done_wk);
403
404 rtnl_lock();
405
406 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
407 NL80211_DFS_AVAILABLE,
408 NL80211_RADAR_CAC_FINISHED);
409
410 rtnl_unlock();
411 }
412
413 /* exported functions */
414
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)415 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
416 const char *requested_name)
417 {
418 static atomic_t wiphy_counter = ATOMIC_INIT(0);
419
420 struct cfg80211_registered_device *rdev;
421 int alloc_size;
422
423 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
424 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
425 WARN_ON(ops->connect && !ops->disconnect);
426 WARN_ON(ops->join_ibss && !ops->leave_ibss);
427 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
428 WARN_ON(ops->add_station && !ops->del_station);
429 WARN_ON(ops->add_mpath && !ops->del_mpath);
430 WARN_ON(ops->join_mesh && !ops->leave_mesh);
431 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
432 WARN_ON(ops->start_ap && !ops->stop_ap);
433 WARN_ON(ops->join_ocb && !ops->leave_ocb);
434 WARN_ON(ops->suspend && !ops->resume);
435 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
436 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
437 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
438 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
439
440 alloc_size = sizeof(*rdev) + sizeof_priv;
441
442 rdev = kzalloc(alloc_size, GFP_KERNEL);
443 if (!rdev)
444 return NULL;
445
446 rdev->ops = ops;
447
448 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
449
450 if (unlikely(rdev->wiphy_idx < 0)) {
451 /* ugh, wrapped! */
452 atomic_dec(&wiphy_counter);
453 kfree(rdev);
454 return NULL;
455 }
456
457 /* atomic_inc_return makes it start at 1, make it start at 0 */
458 rdev->wiphy_idx--;
459
460 /* give it a proper name */
461 if (requested_name && requested_name[0]) {
462 int rv;
463
464 rtnl_lock();
465 rv = cfg80211_dev_check_name(rdev, requested_name);
466
467 if (rv < 0) {
468 rtnl_unlock();
469 goto use_default_name;
470 }
471
472 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
473 rtnl_unlock();
474 if (rv)
475 goto use_default_name;
476 } else {
477 int rv;
478
479 use_default_name:
480 /* NOTE: This is *probably* safe w/out holding rtnl because of
481 * the restrictions on phy names. Probably this call could
482 * fail if some other part of the kernel (re)named a device
483 * phyX. But, might should add some locking and check return
484 * value, and use a different name if this one exists?
485 */
486 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
487 if (rv < 0) {
488 kfree(rdev);
489 return NULL;
490 }
491 }
492
493 mutex_init(&rdev->wiphy.mtx);
494 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
495 INIT_LIST_HEAD(&rdev->beacon_registrations);
496 spin_lock_init(&rdev->beacon_registrations_lock);
497 spin_lock_init(&rdev->bss_lock);
498 INIT_LIST_HEAD(&rdev->bss_list);
499 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
500 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
501 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
502 cfg80211_dfs_channels_update_work);
503 #ifdef CONFIG_CFG80211_WEXT
504 rdev->wiphy.wext = &cfg80211_wext_handler;
505 #endif
506
507 device_initialize(&rdev->wiphy.dev);
508 rdev->wiphy.dev.class = &ieee80211_class;
509 rdev->wiphy.dev.platform_data = rdev;
510 device_enable_async_suspend(&rdev->wiphy.dev);
511
512 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
513 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
514 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
515 INIT_WORK(&rdev->propagate_radar_detect_wk,
516 cfg80211_propagate_radar_detect_wk);
517 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
518 INIT_WORK(&rdev->mgmt_registrations_update_wk,
519 cfg80211_mgmt_registrations_update_wk);
520 spin_lock_init(&rdev->mgmt_registrations_lock);
521
522 #ifdef CONFIG_CFG80211_DEFAULT_PS
523 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
524 #endif
525
526 wiphy_net_set(&rdev->wiphy, &init_net);
527
528 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
529 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
530 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
531 &rdev->rfkill_ops, rdev);
532
533 if (!rdev->wiphy.rfkill) {
534 wiphy_free(&rdev->wiphy);
535 return NULL;
536 }
537
538 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
539 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
540 INIT_WORK(&rdev->event_work, cfg80211_event_work);
541 INIT_WORK(&rdev->background_cac_abort_wk,
542 cfg80211_background_cac_abort_wk);
543 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
544 cfg80211_background_cac_done_wk);
545
546 init_waitqueue_head(&rdev->dev_wait);
547
548 /*
549 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
550 * Fragmentation and RTS threshold are disabled by default with the
551 * special -1 value.
552 */
553 rdev->wiphy.retry_short = 7;
554 rdev->wiphy.retry_long = 4;
555 rdev->wiphy.frag_threshold = (u32) -1;
556 rdev->wiphy.rts_threshold = (u32) -1;
557 rdev->wiphy.coverage_class = 0;
558
559 rdev->wiphy.max_num_csa_counters = 1;
560
561 rdev->wiphy.max_sched_scan_plans = 1;
562 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
563
564 return &rdev->wiphy;
565 }
566 EXPORT_SYMBOL(wiphy_new_nm);
567
wiphy_verify_combinations(struct wiphy * wiphy)568 static int wiphy_verify_combinations(struct wiphy *wiphy)
569 {
570 const struct ieee80211_iface_combination *c;
571 int i, j;
572
573 for (i = 0; i < wiphy->n_iface_combinations; i++) {
574 u32 cnt = 0;
575 u16 all_iftypes = 0;
576
577 c = &wiphy->iface_combinations[i];
578
579 /*
580 * Combinations with just one interface aren't real,
581 * however we make an exception for DFS.
582 */
583 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
584 return -EINVAL;
585
586 /* Need at least one channel */
587 if (WARN_ON(!c->num_different_channels))
588 return -EINVAL;
589
590 /* DFS only works on one channel. */
591 if (WARN_ON(c->radar_detect_widths &&
592 (c->num_different_channels > 1)))
593 return -EINVAL;
594
595 if (WARN_ON(!c->n_limits))
596 return -EINVAL;
597
598 for (j = 0; j < c->n_limits; j++) {
599 u16 types = c->limits[j].types;
600
601 /* interface types shouldn't overlap */
602 if (WARN_ON(types & all_iftypes))
603 return -EINVAL;
604 all_iftypes |= types;
605
606 if (WARN_ON(!c->limits[j].max))
607 return -EINVAL;
608
609 /* Shouldn't list software iftypes in combinations! */
610 if (WARN_ON(wiphy->software_iftypes & types))
611 return -EINVAL;
612
613 /* Only a single P2P_DEVICE can be allowed */
614 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
615 c->limits[j].max > 1))
616 return -EINVAL;
617
618 /* Only a single NAN can be allowed */
619 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
620 c->limits[j].max > 1))
621 return -EINVAL;
622
623 /*
624 * This isn't well-defined right now. If you have an
625 * IBSS interface, then its beacon interval may change
626 * by joining other networks, and nothing prevents it
627 * from doing that.
628 * So technically we probably shouldn't even allow AP
629 * and IBSS in the same interface, but it seems that
630 * some drivers support that, possibly only with fixed
631 * beacon intervals for IBSS.
632 */
633 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
634 c->beacon_int_min_gcd)) {
635 return -EINVAL;
636 }
637
638 cnt += c->limits[j].max;
639 /*
640 * Don't advertise an unsupported type
641 * in a combination.
642 */
643 if (WARN_ON((wiphy->interface_modes & types) != types))
644 return -EINVAL;
645 }
646
647 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
648 return -EINVAL;
649
650 /* You can't even choose that many! */
651 if (WARN_ON(cnt < c->max_interfaces))
652 return -EINVAL;
653 }
654
655 return 0;
656 }
657
wiphy_register(struct wiphy * wiphy)658 int wiphy_register(struct wiphy *wiphy)
659 {
660 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
661 int res;
662 enum nl80211_band band;
663 struct ieee80211_supported_band *sband;
664 bool have_band = false;
665 int i;
666 u16 ifmodes = wiphy->interface_modes;
667
668 #ifdef CONFIG_PM
669 if (WARN_ON(wiphy->wowlan &&
670 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
671 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
672 return -EINVAL;
673 if (WARN_ON(wiphy->wowlan &&
674 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
675 !wiphy->wowlan->tcp))
676 return -EINVAL;
677 #endif
678 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
679 (!rdev->ops->tdls_channel_switch ||
680 !rdev->ops->tdls_cancel_channel_switch)))
681 return -EINVAL;
682
683 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
684 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
685 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
686 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
687 return -EINVAL;
688
689 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
690 return -EINVAL;
691
692 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
693 return -EINVAL;
694
695 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
696 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
697 !wiphy->pmsr_capa->ftm.non_asap))
698 return -EINVAL;
699 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
700 !wiphy->pmsr_capa->ftm.bandwidths))
701 return -EINVAL;
702 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
703 ~(BIT(NL80211_PREAMBLE_LEGACY) |
704 BIT(NL80211_PREAMBLE_HT) |
705 BIT(NL80211_PREAMBLE_VHT) |
706 BIT(NL80211_PREAMBLE_HE) |
707 BIT(NL80211_PREAMBLE_DMG))))
708 return -EINVAL;
709 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
710 wiphy->pmsr_capa->ftm.non_trigger_based) &&
711 !(wiphy->pmsr_capa->ftm.preambles &
712 BIT(NL80211_PREAMBLE_HE))))
713 return -EINVAL;
714 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
715 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
716 BIT(NL80211_CHAN_WIDTH_20) |
717 BIT(NL80211_CHAN_WIDTH_40) |
718 BIT(NL80211_CHAN_WIDTH_80) |
719 BIT(NL80211_CHAN_WIDTH_80P80) |
720 BIT(NL80211_CHAN_WIDTH_160) |
721 BIT(NL80211_CHAN_WIDTH_5) |
722 BIT(NL80211_CHAN_WIDTH_10))))
723 return -EINVAL;
724 }
725
726 /*
727 * if a wiphy has unsupported modes for regulatory channel enforcement,
728 * opt-out of enforcement checking
729 */
730 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
731 BIT(NL80211_IFTYPE_P2P_CLIENT) |
732 BIT(NL80211_IFTYPE_AP) |
733 BIT(NL80211_IFTYPE_P2P_GO) |
734 BIT(NL80211_IFTYPE_ADHOC) |
735 BIT(NL80211_IFTYPE_P2P_DEVICE) |
736 BIT(NL80211_IFTYPE_NAN) |
737 BIT(NL80211_IFTYPE_AP_VLAN) |
738 BIT(NL80211_IFTYPE_MONITOR)))
739 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
740
741 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
742 (wiphy->regulatory_flags &
743 (REGULATORY_CUSTOM_REG |
744 REGULATORY_STRICT_REG |
745 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
746 REGULATORY_COUNTRY_IE_IGNORE))))
747 return -EINVAL;
748
749 if (WARN_ON(wiphy->coalesce &&
750 (!wiphy->coalesce->n_rules ||
751 !wiphy->coalesce->n_patterns) &&
752 (!wiphy->coalesce->pattern_min_len ||
753 wiphy->coalesce->pattern_min_len >
754 wiphy->coalesce->pattern_max_len)))
755 return -EINVAL;
756
757 if (WARN_ON(wiphy->ap_sme_capa &&
758 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
759 return -EINVAL;
760
761 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
762 return -EINVAL;
763
764 if (WARN_ON(wiphy->addresses &&
765 !is_zero_ether_addr(wiphy->perm_addr) &&
766 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
767 ETH_ALEN)))
768 return -EINVAL;
769
770 if (WARN_ON(wiphy->max_acl_mac_addrs &&
771 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
772 !rdev->ops->set_mac_acl)))
773 return -EINVAL;
774
775 /* assure only valid behaviours are flagged by driver
776 * hence subtract 2 as bit 0 is invalid.
777 */
778 if (WARN_ON(wiphy->bss_select_support &&
779 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
780 return -EINVAL;
781
782 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
783 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
784 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
785 return -EINVAL;
786
787 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
788 rdev->ops->update_connect_params))
789 return -EINVAL;
790
791 if (wiphy->addresses)
792 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
793
794 /* sanity check ifmodes */
795 WARN_ON(!ifmodes);
796 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
797 if (WARN_ON(ifmodes != wiphy->interface_modes))
798 wiphy->interface_modes = ifmodes;
799
800 res = wiphy_verify_combinations(wiphy);
801 if (res)
802 return res;
803
804 /* sanity check supported bands/channels */
805 for (band = 0; band < NUM_NL80211_BANDS; band++) {
806 u16 types = 0;
807 bool have_he = false;
808
809 sband = wiphy->bands[band];
810 if (!sband)
811 continue;
812
813 sband->band = band;
814 if (WARN_ON(!sband->n_channels))
815 return -EINVAL;
816 /*
817 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
818 * n_bitrates is 0
819 */
820 if (WARN_ON((band != NL80211_BAND_60GHZ &&
821 band != NL80211_BAND_S1GHZ) &&
822 !sband->n_bitrates))
823 return -EINVAL;
824
825 if (WARN_ON(band == NL80211_BAND_6GHZ &&
826 (sband->ht_cap.ht_supported ||
827 sband->vht_cap.vht_supported)))
828 return -EINVAL;
829
830 /*
831 * Since cfg80211_disable_40mhz_24ghz is global, we can
832 * modify the sband's ht data even if the driver uses a
833 * global structure for that.
834 */
835 if (cfg80211_disable_40mhz_24ghz &&
836 band == NL80211_BAND_2GHZ &&
837 sband->ht_cap.ht_supported) {
838 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
839 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
840 }
841
842 /*
843 * Since we use a u32 for rate bitmaps in
844 * ieee80211_get_response_rate, we cannot
845 * have more than 32 legacy rates.
846 */
847 if (WARN_ON(sband->n_bitrates > 32))
848 return -EINVAL;
849
850 for (i = 0; i < sband->n_channels; i++) {
851 sband->channels[i].orig_flags =
852 sband->channels[i].flags;
853 sband->channels[i].orig_mag = INT_MAX;
854 sband->channels[i].orig_mpwr =
855 sband->channels[i].max_power;
856 sband->channels[i].band = band;
857
858 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
859 return -EINVAL;
860 }
861
862 for (i = 0; i < sband->n_iftype_data; i++) {
863 const struct ieee80211_sband_iftype_data *iftd;
864 bool has_ap, has_non_ap;
865 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
866 BIT(NL80211_IFTYPE_P2P_GO);
867
868 iftd = &sband->iftype_data[i];
869
870 if (WARN_ON(!iftd->types_mask))
871 return -EINVAL;
872 if (WARN_ON(types & iftd->types_mask))
873 return -EINVAL;
874
875 /* at least one piece of information must be present */
876 if (WARN_ON(!iftd->he_cap.has_he))
877 return -EINVAL;
878
879 types |= iftd->types_mask;
880
881 if (i == 0)
882 have_he = iftd->he_cap.has_he;
883 else
884 have_he = have_he &&
885 iftd->he_cap.has_he;
886
887 has_ap = iftd->types_mask & ap_bits;
888 has_non_ap = iftd->types_mask & ~ap_bits;
889
890 /*
891 * For EHT 20 MHz STA, the capabilities format differs
892 * but to simplify, don't check 20 MHz but rather check
893 * only if AP and non-AP were mentioned at the same time,
894 * reject if so.
895 */
896 if (WARN_ON(iftd->eht_cap.has_eht &&
897 has_ap && has_non_ap))
898 return -EINVAL;
899 }
900
901 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
902 return -EINVAL;
903
904 have_band = true;
905 }
906
907 if (!have_band) {
908 WARN_ON(1);
909 return -EINVAL;
910 }
911
912 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
913 /*
914 * Validate we have a policy (can be explicitly set to
915 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
916 * we have at least one of doit/dumpit.
917 */
918 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
919 return -EINVAL;
920 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
921 !rdev->wiphy.vendor_commands[i].dumpit))
922 return -EINVAL;
923 }
924
925 #ifdef CONFIG_PM
926 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
927 (!rdev->wiphy.wowlan->pattern_min_len ||
928 rdev->wiphy.wowlan->pattern_min_len >
929 rdev->wiphy.wowlan->pattern_max_len)))
930 return -EINVAL;
931 #endif
932
933 if (!wiphy->max_num_akm_suites)
934 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
935 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
936 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
937 return -EINVAL;
938
939 /* check backport information when indicated */
940 if (wiphy->backport) {
941 int i;
942 const struct wiphy_backport *backport = wiphy->backport;
943
944 /* should implement num_iftype_ext_capab2 */
945 if (WARN_ON(wiphy->num_iftype_ext_capab !=
946 backport->num_iftype_ext_capab2))
947 return -EINVAL;
948
949 for (i = 0; i < wiphy->num_iftype_ext_capab; i++) {
950 if (WARN_ON(wiphy->iftype_ext_capab[i].iftype !=
951 backport->iftype_ext_capab2[i].iftype))
952 return -EINVAL;
953 }
954 }
955
956 /* check and set up bitrates */
957 ieee80211_set_bitrate_flags(wiphy);
958
959 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
960
961 rtnl_lock();
962 res = device_add(&rdev->wiphy.dev);
963 if (res) {
964 rtnl_unlock();
965 return res;
966 }
967
968 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
969 cfg80211_rdev_list_generation++;
970
971 /* add to debugfs */
972 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
973 ieee80211_debugfs_dir);
974
975 cfg80211_debugfs_rdev_add(rdev);
976 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
977
978 /* set up regulatory info */
979 wiphy_regulatory_register(wiphy);
980
981 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
982 struct regulatory_request request;
983
984 request.wiphy_idx = get_wiphy_idx(wiphy);
985 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
986 request.alpha2[0] = '9';
987 request.alpha2[1] = '9';
988
989 nl80211_send_reg_change_event(&request);
990 }
991
992 /* Check that nobody globally advertises any capabilities they do not
993 * advertise on all possible interface types.
994 */
995 if (wiphy->extended_capabilities_len &&
996 wiphy->num_iftype_ext_capab &&
997 wiphy->iftype_ext_capab) {
998 u8 supported_on_all, j;
999 const struct wiphy_iftype_ext_capab *capab;
1000
1001 capab = wiphy->iftype_ext_capab;
1002 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1003 if (capab[0].extended_capabilities_len > j)
1004 supported_on_all =
1005 capab[0].extended_capabilities[j];
1006 else
1007 supported_on_all = 0x00;
1008 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1009 if (j >= capab[i].extended_capabilities_len) {
1010 supported_on_all = 0x00;
1011 break;
1012 }
1013 supported_on_all &=
1014 capab[i].extended_capabilities[j];
1015 }
1016 if (WARN_ON(wiphy->extended_capabilities[j] &
1017 ~supported_on_all))
1018 break;
1019 }
1020 }
1021
1022 rdev->wiphy.registered = true;
1023 rtnl_unlock();
1024
1025 res = rfkill_register(rdev->wiphy.rfkill);
1026 if (res) {
1027 rfkill_destroy(rdev->wiphy.rfkill);
1028 rdev->wiphy.rfkill = NULL;
1029 wiphy_unregister(&rdev->wiphy);
1030 return res;
1031 }
1032
1033 return 0;
1034 }
1035 EXPORT_SYMBOL(wiphy_register);
1036
wiphy_rfkill_start_polling(struct wiphy * wiphy)1037 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1038 {
1039 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1040
1041 if (!rdev->ops->rfkill_poll)
1042 return;
1043 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1044 rfkill_resume_polling(wiphy->rfkill);
1045 }
1046 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1047
wiphy_unregister(struct wiphy * wiphy)1048 void wiphy_unregister(struct wiphy *wiphy)
1049 {
1050 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1051
1052 wait_event(rdev->dev_wait, ({
1053 int __count;
1054 wiphy_lock(&rdev->wiphy);
1055 __count = rdev->opencount;
1056 wiphy_unlock(&rdev->wiphy);
1057 __count == 0; }));
1058
1059 if (rdev->wiphy.rfkill)
1060 rfkill_unregister(rdev->wiphy.rfkill);
1061
1062 rtnl_lock();
1063 wiphy_lock(&rdev->wiphy);
1064 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1065 rdev->wiphy.registered = false;
1066
1067 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1068
1069 /*
1070 * First remove the hardware from everywhere, this makes
1071 * it impossible to find from userspace.
1072 */
1073 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1074 list_del_rcu(&rdev->list);
1075 synchronize_rcu();
1076
1077 /*
1078 * If this device got a regulatory hint tell core its
1079 * free to listen now to a new shiny device regulatory hint
1080 */
1081 wiphy_regulatory_deregister(wiphy);
1082
1083 cfg80211_rdev_list_generation++;
1084 device_del(&rdev->wiphy.dev);
1085
1086 wiphy_unlock(&rdev->wiphy);
1087 rtnl_unlock();
1088
1089 flush_work(&rdev->scan_done_wk);
1090 cancel_work_sync(&rdev->conn_work);
1091 flush_work(&rdev->event_work);
1092 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1093 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1094 flush_work(&rdev->destroy_work);
1095 flush_work(&rdev->sched_scan_stop_wk);
1096 flush_work(&rdev->propagate_radar_detect_wk);
1097 flush_work(&rdev->propagate_cac_done_wk);
1098 flush_work(&rdev->mgmt_registrations_update_wk);
1099 flush_work(&rdev->background_cac_abort_wk);
1100
1101 #ifdef CONFIG_PM
1102 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1103 rdev_set_wakeup(rdev, false);
1104 #endif
1105 cfg80211_rdev_free_wowlan(rdev);
1106 cfg80211_rdev_free_coalesce(rdev);
1107 }
1108 EXPORT_SYMBOL(wiphy_unregister);
1109
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1110 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1111 {
1112 struct cfg80211_internal_bss *scan, *tmp;
1113 struct cfg80211_beacon_registration *reg, *treg;
1114 rfkill_destroy(rdev->wiphy.rfkill);
1115 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1116 list_del(®->list);
1117 kfree(reg);
1118 }
1119 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1120 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1121 mutex_destroy(&rdev->wiphy.mtx);
1122
1123 /*
1124 * The 'regd' can only be non-NULL if we never finished
1125 * initializing the wiphy and thus never went through the
1126 * unregister path - e.g. in failure scenarios. Thus, it
1127 * cannot have been visible to anyone if non-NULL, so we
1128 * can just free it here.
1129 */
1130 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1131
1132 kfree(rdev);
1133 }
1134
wiphy_free(struct wiphy * wiphy)1135 void wiphy_free(struct wiphy *wiphy)
1136 {
1137 put_device(&wiphy->dev);
1138 }
1139 EXPORT_SYMBOL(wiphy_free);
1140
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1141 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1142 enum rfkill_hard_block_reasons reason)
1143 {
1144 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1145
1146 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1147 schedule_work(&rdev->rfkill_block);
1148 }
1149 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1150
cfg80211_cqm_config_free(struct wireless_dev * wdev)1151 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1152 {
1153 kfree(wdev->cqm_config);
1154 wdev->cqm_config = NULL;
1155 }
1156
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1157 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1158 bool unregister_netdev)
1159 {
1160 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1161 unsigned int link_id;
1162
1163 ASSERT_RTNL();
1164 lockdep_assert_held(&rdev->wiphy.mtx);
1165
1166 flush_work(&wdev->pmsr_free_wk);
1167
1168 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1169
1170 wdev->registered = false;
1171
1172 if (wdev->netdev) {
1173 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1174 if (unregister_netdev)
1175 unregister_netdevice(wdev->netdev);
1176 }
1177
1178 list_del_rcu(&wdev->list);
1179 synchronize_net();
1180 rdev->devlist_generation++;
1181
1182 cfg80211_mlme_purge_registrations(wdev);
1183
1184 switch (wdev->iftype) {
1185 case NL80211_IFTYPE_P2P_DEVICE:
1186 cfg80211_stop_p2p_device(rdev, wdev);
1187 break;
1188 case NL80211_IFTYPE_NAN:
1189 cfg80211_stop_nan(rdev, wdev);
1190 break;
1191 default:
1192 break;
1193 }
1194
1195 #ifdef CONFIG_CFG80211_WEXT
1196 kfree_sensitive(wdev->wext.keys);
1197 wdev->wext.keys = NULL;
1198 #endif
1199 /* only initialized if we have a netdev */
1200 if (wdev->netdev)
1201 flush_work(&wdev->disconnect_wk);
1202
1203 cfg80211_cqm_config_free(wdev);
1204
1205 /*
1206 * Ensure that all events have been processed and
1207 * freed.
1208 */
1209 cfg80211_process_wdev_events(wdev);
1210
1211 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1212 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1213 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1214 struct cfg80211_internal_bss *curbss;
1215
1216 curbss = wdev->links[link_id].client.current_bss;
1217
1218 if (WARN_ON(curbss)) {
1219 cfg80211_unhold_bss(curbss);
1220 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1221 wdev->links[link_id].client.current_bss = NULL;
1222 }
1223 }
1224 }
1225
1226 wdev->connected = false;
1227 }
1228
cfg80211_unregister_wdev(struct wireless_dev * wdev)1229 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1230 {
1231 _cfg80211_unregister_wdev(wdev, true);
1232 }
1233 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1234
1235 static const struct device_type wiphy_type = {
1236 .name = "wlan",
1237 };
1238
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1239 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1240 enum nl80211_iftype iftype, int num)
1241 {
1242 lockdep_assert_held(&rdev->wiphy.mtx);
1243
1244 rdev->num_running_ifaces += num;
1245 if (iftype == NL80211_IFTYPE_MONITOR)
1246 rdev->num_running_monitor_ifaces += num;
1247 }
1248
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1249 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1250 struct wireless_dev *wdev)
1251 {
1252 struct net_device *dev = wdev->netdev;
1253 struct cfg80211_sched_scan_request *pos, *tmp;
1254
1255 lockdep_assert_held(&rdev->wiphy.mtx);
1256 ASSERT_WDEV_LOCK(wdev);
1257
1258 cfg80211_pmsr_wdev_down(wdev);
1259
1260 cfg80211_stop_background_radar_detection(wdev);
1261
1262 switch (wdev->iftype) {
1263 case NL80211_IFTYPE_ADHOC:
1264 __cfg80211_leave_ibss(rdev, dev, true);
1265 break;
1266 case NL80211_IFTYPE_P2P_CLIENT:
1267 case NL80211_IFTYPE_STATION:
1268 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1269 list) {
1270 if (dev == pos->dev)
1271 cfg80211_stop_sched_scan_req(rdev, pos, false);
1272 }
1273
1274 #ifdef CONFIG_CFG80211_WEXT
1275 kfree(wdev->wext.ie);
1276 wdev->wext.ie = NULL;
1277 wdev->wext.ie_len = 0;
1278 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1279 #endif
1280 cfg80211_disconnect(rdev, dev,
1281 WLAN_REASON_DEAUTH_LEAVING, true);
1282 break;
1283 case NL80211_IFTYPE_MESH_POINT:
1284 __cfg80211_leave_mesh(rdev, dev);
1285 break;
1286 case NL80211_IFTYPE_AP:
1287 case NL80211_IFTYPE_P2P_GO:
1288 __cfg80211_stop_ap(rdev, dev, -1, true);
1289 break;
1290 case NL80211_IFTYPE_OCB:
1291 __cfg80211_leave_ocb(rdev, dev);
1292 break;
1293 case NL80211_IFTYPE_P2P_DEVICE:
1294 case NL80211_IFTYPE_NAN:
1295 /* cannot happen, has no netdev */
1296 break;
1297 case NL80211_IFTYPE_AP_VLAN:
1298 case NL80211_IFTYPE_MONITOR:
1299 /* nothing to do */
1300 break;
1301 case NL80211_IFTYPE_UNSPECIFIED:
1302 case NL80211_IFTYPE_WDS:
1303 case NUM_NL80211_IFTYPES:
1304 /* invalid */
1305 break;
1306 }
1307 }
1308
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1309 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1310 struct wireless_dev *wdev)
1311 {
1312 wdev_lock(wdev);
1313 __cfg80211_leave(rdev, wdev);
1314 wdev_unlock(wdev);
1315 }
1316
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1317 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1318 gfp_t gfp)
1319 {
1320 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1321 struct cfg80211_event *ev;
1322 unsigned long flags;
1323
1324 trace_cfg80211_stop_iface(wiphy, wdev);
1325
1326 ev = kzalloc(sizeof(*ev), gfp);
1327 if (!ev)
1328 return;
1329
1330 ev->type = EVENT_STOPPED;
1331
1332 spin_lock_irqsave(&wdev->event_lock, flags);
1333 list_add_tail(&ev->list, &wdev->event_list);
1334 spin_unlock_irqrestore(&wdev->event_lock, flags);
1335 queue_work(cfg80211_wq, &rdev->event_work);
1336 }
1337 EXPORT_SYMBOL(cfg80211_stop_iface);
1338
cfg80211_init_wdev(struct wireless_dev * wdev)1339 void cfg80211_init_wdev(struct wireless_dev *wdev)
1340 {
1341 mutex_init(&wdev->mtx);
1342 INIT_LIST_HEAD(&wdev->event_list);
1343 spin_lock_init(&wdev->event_lock);
1344 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1345 INIT_LIST_HEAD(&wdev->pmsr_list);
1346 spin_lock_init(&wdev->pmsr_lock);
1347 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1348
1349 #ifdef CONFIG_CFG80211_WEXT
1350 wdev->wext.default_key = -1;
1351 wdev->wext.default_mgmt_key = -1;
1352 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1353 #endif
1354
1355 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1356 wdev->ps = true;
1357 else
1358 wdev->ps = false;
1359 /* allow mac80211 to determine the timeout */
1360 wdev->ps_timeout = -1;
1361
1362 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1363 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1364 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1365 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1366
1367 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1368 }
1369
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1370 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1371 struct wireless_dev *wdev)
1372 {
1373 ASSERT_RTNL();
1374 lockdep_assert_held(&rdev->wiphy.mtx);
1375
1376 /*
1377 * We get here also when the interface changes network namespaces,
1378 * as it's registered into the new one, but we don't want it to
1379 * change ID in that case. Checking if the ID is already assigned
1380 * works, because 0 isn't considered a valid ID and the memory is
1381 * 0-initialized.
1382 */
1383 if (!wdev->identifier)
1384 wdev->identifier = ++rdev->wdev_id;
1385 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1386 rdev->devlist_generation++;
1387 wdev->registered = true;
1388
1389 if (wdev->netdev &&
1390 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1391 "phy80211"))
1392 pr_err("failed to add phy80211 symlink to netdev!\n");
1393
1394 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1395 }
1396
cfg80211_register_netdevice(struct net_device * dev)1397 int cfg80211_register_netdevice(struct net_device *dev)
1398 {
1399 struct wireless_dev *wdev = dev->ieee80211_ptr;
1400 struct cfg80211_registered_device *rdev;
1401 int ret;
1402
1403 ASSERT_RTNL();
1404
1405 if (WARN_ON(!wdev))
1406 return -EINVAL;
1407
1408 rdev = wiphy_to_rdev(wdev->wiphy);
1409
1410 lockdep_assert_held(&rdev->wiphy.mtx);
1411
1412 /* we'll take care of this */
1413 wdev->registered = true;
1414 wdev->registering = true;
1415 ret = register_netdevice(dev);
1416 if (ret)
1417 goto out;
1418
1419 cfg80211_register_wdev(rdev, wdev);
1420 ret = 0;
1421 out:
1422 wdev->registering = false;
1423 if (ret)
1424 wdev->registered = false;
1425 return ret;
1426 }
1427 EXPORT_SYMBOL(cfg80211_register_netdevice);
1428
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1429 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1430 unsigned long state, void *ptr)
1431 {
1432 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1433 struct wireless_dev *wdev = dev->ieee80211_ptr;
1434 struct cfg80211_registered_device *rdev;
1435 struct cfg80211_sched_scan_request *pos, *tmp;
1436
1437 if (!wdev)
1438 return NOTIFY_DONE;
1439
1440 rdev = wiphy_to_rdev(wdev->wiphy);
1441
1442 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1443
1444 switch (state) {
1445 case NETDEV_POST_INIT:
1446 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1447 wdev->netdev = dev;
1448 /* can only change netns with wiphy */
1449 dev->features |= NETIF_F_NETNS_LOCAL;
1450
1451 cfg80211_init_wdev(wdev);
1452 break;
1453 case NETDEV_REGISTER:
1454 if (!wdev->registered) {
1455 wiphy_lock(&rdev->wiphy);
1456 cfg80211_register_wdev(rdev, wdev);
1457 wiphy_unlock(&rdev->wiphy);
1458 }
1459 break;
1460 case NETDEV_UNREGISTER:
1461 /*
1462 * It is possible to get NETDEV_UNREGISTER multiple times,
1463 * so check wdev->registered.
1464 */
1465 if (wdev->registered && !wdev->registering) {
1466 wiphy_lock(&rdev->wiphy);
1467 _cfg80211_unregister_wdev(wdev, false);
1468 wiphy_unlock(&rdev->wiphy);
1469 }
1470 break;
1471 case NETDEV_GOING_DOWN:
1472 wiphy_lock(&rdev->wiphy);
1473 cfg80211_leave(rdev, wdev);
1474 cfg80211_remove_links(wdev);
1475 wiphy_unlock(&rdev->wiphy);
1476 break;
1477 case NETDEV_DOWN:
1478 wiphy_lock(&rdev->wiphy);
1479 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1480 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1481 if (WARN_ON(!rdev->scan_req->notified &&
1482 (!rdev->int_scan_req ||
1483 !rdev->int_scan_req->notified)))
1484 rdev->scan_req->info.aborted = true;
1485 ___cfg80211_scan_done(rdev, false);
1486 }
1487
1488 list_for_each_entry_safe(pos, tmp,
1489 &rdev->sched_scan_req_list, list) {
1490 if (WARN_ON(pos->dev == wdev->netdev))
1491 cfg80211_stop_sched_scan_req(rdev, pos, false);
1492 }
1493
1494 rdev->opencount--;
1495 wiphy_unlock(&rdev->wiphy);
1496 wake_up(&rdev->dev_wait);
1497 break;
1498 case NETDEV_UP:
1499 wiphy_lock(&rdev->wiphy);
1500 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1501 wdev_lock(wdev);
1502 switch (wdev->iftype) {
1503 #ifdef CONFIG_CFG80211_WEXT
1504 case NL80211_IFTYPE_ADHOC:
1505 cfg80211_ibss_wext_join(rdev, wdev);
1506 break;
1507 case NL80211_IFTYPE_STATION:
1508 cfg80211_mgd_wext_connect(rdev, wdev);
1509 break;
1510 #endif
1511 #ifdef CONFIG_MAC80211_MESH
1512 case NL80211_IFTYPE_MESH_POINT:
1513 {
1514 /* backward compat code... */
1515 struct mesh_setup setup;
1516 memcpy(&setup, &default_mesh_setup,
1517 sizeof(setup));
1518 /* back compat only needed for mesh_id */
1519 setup.mesh_id = wdev->u.mesh.id;
1520 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1521 if (wdev->u.mesh.id_up_len)
1522 __cfg80211_join_mesh(rdev, dev,
1523 &setup,
1524 &default_mesh_config);
1525 break;
1526 }
1527 #endif
1528 default:
1529 break;
1530 }
1531 wdev_unlock(wdev);
1532 rdev->opencount++;
1533
1534 /*
1535 * Configure power management to the driver here so that its
1536 * correctly set also after interface type changes etc.
1537 */
1538 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1539 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1540 rdev->ops->set_power_mgmt &&
1541 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1542 wdev->ps_timeout)) {
1543 /* assume this means it's off */
1544 wdev->ps = false;
1545 }
1546 wiphy_unlock(&rdev->wiphy);
1547 break;
1548 case NETDEV_PRE_UP:
1549 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1550 wdev->use_4addr, 0))
1551 return notifier_from_errno(-EOPNOTSUPP);
1552
1553 if (rfkill_blocked(rdev->wiphy.rfkill))
1554 return notifier_from_errno(-ERFKILL);
1555 break;
1556 default:
1557 return NOTIFY_DONE;
1558 }
1559
1560 wireless_nlevent_flush();
1561
1562 return NOTIFY_OK;
1563 }
1564
1565 static struct notifier_block cfg80211_netdev_notifier = {
1566 .notifier_call = cfg80211_netdev_notifier_call,
1567 };
1568
cfg80211_pernet_exit(struct net * net)1569 static void __net_exit cfg80211_pernet_exit(struct net *net)
1570 {
1571 struct cfg80211_registered_device *rdev;
1572
1573 rtnl_lock();
1574 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1575 if (net_eq(wiphy_net(&rdev->wiphy), net))
1576 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1577 }
1578 rtnl_unlock();
1579 }
1580
1581 static struct pernet_operations cfg80211_pernet_ops = {
1582 .exit = cfg80211_pernet_exit,
1583 };
1584
cfg80211_init(void)1585 static int __init cfg80211_init(void)
1586 {
1587 int err;
1588
1589 err = register_pernet_device(&cfg80211_pernet_ops);
1590 if (err)
1591 goto out_fail_pernet;
1592
1593 err = wiphy_sysfs_init();
1594 if (err)
1595 goto out_fail_sysfs;
1596
1597 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1598 if (err)
1599 goto out_fail_notifier;
1600
1601 err = nl80211_init();
1602 if (err)
1603 goto out_fail_nl80211;
1604
1605 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1606
1607 err = regulatory_init();
1608 if (err)
1609 goto out_fail_reg;
1610
1611 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1612 if (!cfg80211_wq) {
1613 err = -ENOMEM;
1614 goto out_fail_wq;
1615 }
1616
1617 return 0;
1618
1619 out_fail_wq:
1620 regulatory_exit();
1621 out_fail_reg:
1622 debugfs_remove(ieee80211_debugfs_dir);
1623 nl80211_exit();
1624 out_fail_nl80211:
1625 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1626 out_fail_notifier:
1627 wiphy_sysfs_exit();
1628 out_fail_sysfs:
1629 unregister_pernet_device(&cfg80211_pernet_ops);
1630 out_fail_pernet:
1631 return err;
1632 }
1633 fs_initcall(cfg80211_init);
1634
cfg80211_exit(void)1635 static void __exit cfg80211_exit(void)
1636 {
1637 debugfs_remove(ieee80211_debugfs_dir);
1638 nl80211_exit();
1639 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1640 wiphy_sysfs_exit();
1641 regulatory_exit();
1642 unregister_pernet_device(&cfg80211_pernet_ops);
1643 destroy_workqueue(cfg80211_wq);
1644 }
1645 module_exit(cfg80211_exit);
1646