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_MESH_POINT) |
734 BIT(NL80211_IFTYPE_P2P_GO) |
735 BIT(NL80211_IFTYPE_ADHOC) |
736 BIT(NL80211_IFTYPE_P2P_DEVICE) |
737 BIT(NL80211_IFTYPE_NAN) |
738 BIT(NL80211_IFTYPE_AP_VLAN) |
739 BIT(NL80211_IFTYPE_MONITOR)))
740 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
741
742 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
743 (wiphy->regulatory_flags &
744 (REGULATORY_CUSTOM_REG |
745 REGULATORY_STRICT_REG |
746 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
747 REGULATORY_COUNTRY_IE_IGNORE))))
748 return -EINVAL;
749
750 if (WARN_ON(wiphy->coalesce &&
751 (!wiphy->coalesce->n_rules ||
752 !wiphy->coalesce->n_patterns) &&
753 (!wiphy->coalesce->pattern_min_len ||
754 wiphy->coalesce->pattern_min_len >
755 wiphy->coalesce->pattern_max_len)))
756 return -EINVAL;
757
758 if (WARN_ON(wiphy->ap_sme_capa &&
759 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
760 return -EINVAL;
761
762 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
763 return -EINVAL;
764
765 if (WARN_ON(wiphy->addresses &&
766 !is_zero_ether_addr(wiphy->perm_addr) &&
767 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
768 ETH_ALEN)))
769 return -EINVAL;
770
771 if (WARN_ON(wiphy->max_acl_mac_addrs &&
772 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
773 !rdev->ops->set_mac_acl)))
774 return -EINVAL;
775
776 /* assure only valid behaviours are flagged by driver
777 * hence subtract 2 as bit 0 is invalid.
778 */
779 if (WARN_ON(wiphy->bss_select_support &&
780 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
781 return -EINVAL;
782
783 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
784 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
785 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
786 return -EINVAL;
787
788 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
789 rdev->ops->update_connect_params))
790 return -EINVAL;
791
792 if (wiphy->addresses)
793 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
794
795 /* sanity check ifmodes */
796 WARN_ON(!ifmodes);
797 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
798 if (WARN_ON(ifmodes != wiphy->interface_modes))
799 wiphy->interface_modes = ifmodes;
800
801 res = wiphy_verify_combinations(wiphy);
802 if (res)
803 return res;
804
805 /* sanity check supported bands/channels */
806 for (band = 0; band < NUM_NL80211_BANDS; band++) {
807 u16 types = 0;
808 bool have_he = false;
809
810 sband = wiphy->bands[band];
811 if (!sband)
812 continue;
813
814 sband->band = band;
815 if (WARN_ON(!sband->n_channels))
816 return -EINVAL;
817 /*
818 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
819 * n_bitrates is 0
820 */
821 if (WARN_ON((band != NL80211_BAND_60GHZ &&
822 band != NL80211_BAND_S1GHZ) &&
823 !sband->n_bitrates))
824 return -EINVAL;
825
826 if (WARN_ON(band == NL80211_BAND_6GHZ &&
827 (sband->ht_cap.ht_supported ||
828 sband->vht_cap.vht_supported)))
829 return -EINVAL;
830
831 /*
832 * Since cfg80211_disable_40mhz_24ghz is global, we can
833 * modify the sband's ht data even if the driver uses a
834 * global structure for that.
835 */
836 if (cfg80211_disable_40mhz_24ghz &&
837 band == NL80211_BAND_2GHZ &&
838 sband->ht_cap.ht_supported) {
839 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
840 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
841 }
842
843 /*
844 * Since we use a u32 for rate bitmaps in
845 * ieee80211_get_response_rate, we cannot
846 * have more than 32 legacy rates.
847 */
848 if (WARN_ON(sband->n_bitrates > 32))
849 return -EINVAL;
850
851 for (i = 0; i < sband->n_channels; i++) {
852 sband->channels[i].orig_flags =
853 sband->channels[i].flags;
854 sband->channels[i].orig_mag = INT_MAX;
855 sband->channels[i].orig_mpwr =
856 sband->channels[i].max_power;
857 sband->channels[i].band = band;
858
859 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
860 return -EINVAL;
861 }
862
863 for (i = 0; i < sband->n_iftype_data; i++) {
864 const struct ieee80211_sband_iftype_data *iftd;
865 bool has_ap, has_non_ap;
866 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
867 BIT(NL80211_IFTYPE_P2P_GO);
868
869 iftd = &sband->iftype_data[i];
870
871 if (WARN_ON(!iftd->types_mask))
872 return -EINVAL;
873 if (WARN_ON(types & iftd->types_mask))
874 return -EINVAL;
875
876 /* at least one piece of information must be present */
877 if (WARN_ON(!iftd->he_cap.has_he))
878 return -EINVAL;
879
880 types |= iftd->types_mask;
881
882 if (i == 0)
883 have_he = iftd->he_cap.has_he;
884 else
885 have_he = have_he &&
886 iftd->he_cap.has_he;
887
888 has_ap = iftd->types_mask & ap_bits;
889 has_non_ap = iftd->types_mask & ~ap_bits;
890
891 /*
892 * For EHT 20 MHz STA, the capabilities format differs
893 * but to simplify, don't check 20 MHz but rather check
894 * only if AP and non-AP were mentioned at the same time,
895 * reject if so.
896 */
897 if (WARN_ON(iftd->eht_cap.has_eht &&
898 has_ap && has_non_ap))
899 return -EINVAL;
900 }
901
902 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
903 return -EINVAL;
904
905 have_band = true;
906 }
907
908 if (!have_band) {
909 WARN_ON(1);
910 return -EINVAL;
911 }
912
913 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
914 /*
915 * Validate we have a policy (can be explicitly set to
916 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
917 * we have at least one of doit/dumpit.
918 */
919 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
920 return -EINVAL;
921 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
922 !rdev->wiphy.vendor_commands[i].dumpit))
923 return -EINVAL;
924 }
925
926 #ifdef CONFIG_PM
927 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
928 (!rdev->wiphy.wowlan->pattern_min_len ||
929 rdev->wiphy.wowlan->pattern_min_len >
930 rdev->wiphy.wowlan->pattern_max_len)))
931 return -EINVAL;
932 #endif
933
934 if (!wiphy->max_num_akm_suites)
935 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
936 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
937 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
938 return -EINVAL;
939
940 /* check and set up bitrates */
941 ieee80211_set_bitrate_flags(wiphy);
942
943 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
944
945 rtnl_lock();
946 res = device_add(&rdev->wiphy.dev);
947 if (res) {
948 rtnl_unlock();
949 return res;
950 }
951
952 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
953 cfg80211_rdev_list_generation++;
954
955 /* add to debugfs */
956 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
957 ieee80211_debugfs_dir);
958
959 cfg80211_debugfs_rdev_add(rdev);
960 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
961
962 /* set up regulatory info */
963 wiphy_regulatory_register(wiphy);
964
965 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
966 struct regulatory_request request;
967
968 request.wiphy_idx = get_wiphy_idx(wiphy);
969 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
970 request.alpha2[0] = '9';
971 request.alpha2[1] = '9';
972
973 nl80211_send_reg_change_event(&request);
974 }
975
976 /* Check that nobody globally advertises any capabilities they do not
977 * advertise on all possible interface types.
978 */
979 if (wiphy->extended_capabilities_len &&
980 wiphy->num_iftype_ext_capab &&
981 wiphy->iftype_ext_capab) {
982 u8 supported_on_all, j;
983 const struct wiphy_iftype_ext_capab *capab;
984
985 capab = wiphy->iftype_ext_capab;
986 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
987 if (capab[0].extended_capabilities_len > j)
988 supported_on_all =
989 capab[0].extended_capabilities[j];
990 else
991 supported_on_all = 0x00;
992 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
993 if (j >= capab[i].extended_capabilities_len) {
994 supported_on_all = 0x00;
995 break;
996 }
997 supported_on_all &=
998 capab[i].extended_capabilities[j];
999 }
1000 if (WARN_ON(wiphy->extended_capabilities[j] &
1001 ~supported_on_all))
1002 break;
1003 }
1004 }
1005
1006 rdev->wiphy.registered = true;
1007 rtnl_unlock();
1008
1009 res = rfkill_register(rdev->wiphy.rfkill);
1010 if (res) {
1011 rfkill_destroy(rdev->wiphy.rfkill);
1012 rdev->wiphy.rfkill = NULL;
1013 wiphy_unregister(&rdev->wiphy);
1014 return res;
1015 }
1016
1017 return 0;
1018 }
1019 EXPORT_SYMBOL(wiphy_register);
1020
wiphy_rfkill_start_polling(struct wiphy * wiphy)1021 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1022 {
1023 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1024
1025 if (!rdev->ops->rfkill_poll)
1026 return;
1027 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1028 rfkill_resume_polling(wiphy->rfkill);
1029 }
1030 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1031
wiphy_unregister(struct wiphy * wiphy)1032 void wiphy_unregister(struct wiphy *wiphy)
1033 {
1034 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1035
1036 wait_event(rdev->dev_wait, ({
1037 int __count;
1038 wiphy_lock(&rdev->wiphy);
1039 __count = rdev->opencount;
1040 wiphy_unlock(&rdev->wiphy);
1041 __count == 0; }));
1042
1043 if (rdev->wiphy.rfkill)
1044 rfkill_unregister(rdev->wiphy.rfkill);
1045
1046 rtnl_lock();
1047 wiphy_lock(&rdev->wiphy);
1048 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1049 rdev->wiphy.registered = false;
1050
1051 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1052
1053 /*
1054 * First remove the hardware from everywhere, this makes
1055 * it impossible to find from userspace.
1056 */
1057 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1058 list_del_rcu(&rdev->list);
1059 synchronize_rcu();
1060
1061 /*
1062 * If this device got a regulatory hint tell core its
1063 * free to listen now to a new shiny device regulatory hint
1064 */
1065 wiphy_regulatory_deregister(wiphy);
1066
1067 cfg80211_rdev_list_generation++;
1068 device_del(&rdev->wiphy.dev);
1069
1070 wiphy_unlock(&rdev->wiphy);
1071 rtnl_unlock();
1072
1073 flush_work(&rdev->scan_done_wk);
1074 cancel_work_sync(&rdev->conn_work);
1075 flush_work(&rdev->event_work);
1076 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1077 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1078 flush_work(&rdev->destroy_work);
1079 flush_work(&rdev->sched_scan_stop_wk);
1080 flush_work(&rdev->propagate_radar_detect_wk);
1081 flush_work(&rdev->propagate_cac_done_wk);
1082 flush_work(&rdev->mgmt_registrations_update_wk);
1083 flush_work(&rdev->background_cac_abort_wk);
1084
1085 #ifdef CONFIG_PM
1086 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1087 rdev_set_wakeup(rdev, false);
1088 #endif
1089 cfg80211_rdev_free_wowlan(rdev);
1090 cfg80211_rdev_free_coalesce(rdev);
1091 }
1092 EXPORT_SYMBOL(wiphy_unregister);
1093
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1094 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1095 {
1096 struct cfg80211_internal_bss *scan, *tmp;
1097 struct cfg80211_beacon_registration *reg, *treg;
1098 rfkill_destroy(rdev->wiphy.rfkill);
1099 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1100 list_del(®->list);
1101 kfree(reg);
1102 }
1103 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1104 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1105 mutex_destroy(&rdev->wiphy.mtx);
1106
1107 /*
1108 * The 'regd' can only be non-NULL if we never finished
1109 * initializing the wiphy and thus never went through the
1110 * unregister path - e.g. in failure scenarios. Thus, it
1111 * cannot have been visible to anyone if non-NULL, so we
1112 * can just free it here.
1113 */
1114 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1115
1116 kfree(rdev);
1117 }
1118
wiphy_free(struct wiphy * wiphy)1119 void wiphy_free(struct wiphy *wiphy)
1120 {
1121 put_device(&wiphy->dev);
1122 }
1123 EXPORT_SYMBOL(wiphy_free);
1124
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1125 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1126 enum rfkill_hard_block_reasons reason)
1127 {
1128 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1129
1130 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1131 schedule_work(&rdev->rfkill_block);
1132 }
1133 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1134
cfg80211_cqm_config_free(struct wireless_dev * wdev)1135 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1136 {
1137 kfree(wdev->cqm_config);
1138 wdev->cqm_config = NULL;
1139 }
1140
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1141 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1142 bool unregister_netdev)
1143 {
1144 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1145 unsigned int link_id;
1146
1147 ASSERT_RTNL();
1148 lockdep_assert_held(&rdev->wiphy.mtx);
1149
1150 flush_work(&wdev->pmsr_free_wk);
1151
1152 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1153
1154 wdev->registered = false;
1155
1156 if (wdev->netdev) {
1157 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1158 if (unregister_netdev)
1159 unregister_netdevice(wdev->netdev);
1160 }
1161
1162 list_del_rcu(&wdev->list);
1163 synchronize_net();
1164 rdev->devlist_generation++;
1165
1166 cfg80211_mlme_purge_registrations(wdev);
1167
1168 switch (wdev->iftype) {
1169 case NL80211_IFTYPE_P2P_DEVICE:
1170 cfg80211_stop_p2p_device(rdev, wdev);
1171 break;
1172 case NL80211_IFTYPE_NAN:
1173 cfg80211_stop_nan(rdev, wdev);
1174 break;
1175 default:
1176 break;
1177 }
1178
1179 #ifdef CONFIG_CFG80211_WEXT
1180 kfree_sensitive(wdev->wext.keys);
1181 wdev->wext.keys = NULL;
1182 #endif
1183 /* only initialized if we have a netdev */
1184 if (wdev->netdev)
1185 flush_work(&wdev->disconnect_wk);
1186
1187 cfg80211_cqm_config_free(wdev);
1188
1189 /*
1190 * Ensure that all events have been processed and
1191 * freed.
1192 */
1193 cfg80211_process_wdev_events(wdev);
1194
1195 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1196 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1197 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1198 struct cfg80211_internal_bss *curbss;
1199
1200 curbss = wdev->links[link_id].client.current_bss;
1201
1202 if (WARN_ON(curbss)) {
1203 cfg80211_unhold_bss(curbss);
1204 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1205 wdev->links[link_id].client.current_bss = NULL;
1206 }
1207 }
1208 }
1209
1210 wdev->connected = false;
1211 }
1212
cfg80211_unregister_wdev(struct wireless_dev * wdev)1213 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1214 {
1215 _cfg80211_unregister_wdev(wdev, true);
1216 }
1217 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1218
1219 static const struct device_type wiphy_type = {
1220 .name = "wlan",
1221 };
1222
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1223 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1224 enum nl80211_iftype iftype, int num)
1225 {
1226 lockdep_assert_held(&rdev->wiphy.mtx);
1227
1228 rdev->num_running_ifaces += num;
1229 if (iftype == NL80211_IFTYPE_MONITOR)
1230 rdev->num_running_monitor_ifaces += num;
1231 }
1232
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1233 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1234 struct wireless_dev *wdev)
1235 {
1236 struct net_device *dev = wdev->netdev;
1237 struct cfg80211_sched_scan_request *pos, *tmp;
1238
1239 lockdep_assert_held(&rdev->wiphy.mtx);
1240 ASSERT_WDEV_LOCK(wdev);
1241
1242 cfg80211_pmsr_wdev_down(wdev);
1243
1244 cfg80211_stop_background_radar_detection(wdev);
1245
1246 switch (wdev->iftype) {
1247 case NL80211_IFTYPE_ADHOC:
1248 __cfg80211_leave_ibss(rdev, dev, true);
1249 break;
1250 case NL80211_IFTYPE_P2P_CLIENT:
1251 case NL80211_IFTYPE_STATION:
1252 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1253 list) {
1254 if (dev == pos->dev)
1255 cfg80211_stop_sched_scan_req(rdev, pos, false);
1256 }
1257
1258 #ifdef CONFIG_CFG80211_WEXT
1259 kfree(wdev->wext.ie);
1260 wdev->wext.ie = NULL;
1261 wdev->wext.ie_len = 0;
1262 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1263 #endif
1264 cfg80211_disconnect(rdev, dev,
1265 WLAN_REASON_DEAUTH_LEAVING, true);
1266 break;
1267 case NL80211_IFTYPE_MESH_POINT:
1268 __cfg80211_leave_mesh(rdev, dev);
1269 break;
1270 case NL80211_IFTYPE_AP:
1271 case NL80211_IFTYPE_P2P_GO:
1272 __cfg80211_stop_ap(rdev, dev, -1, true);
1273 break;
1274 case NL80211_IFTYPE_OCB:
1275 __cfg80211_leave_ocb(rdev, dev);
1276 break;
1277 case NL80211_IFTYPE_P2P_DEVICE:
1278 case NL80211_IFTYPE_NAN:
1279 /* cannot happen, has no netdev */
1280 break;
1281 case NL80211_IFTYPE_AP_VLAN:
1282 case NL80211_IFTYPE_MONITOR:
1283 /* nothing to do */
1284 break;
1285 case NL80211_IFTYPE_UNSPECIFIED:
1286 case NL80211_IFTYPE_WDS:
1287 case NUM_NL80211_IFTYPES:
1288 /* invalid */
1289 break;
1290 }
1291 }
1292
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1293 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1294 struct wireless_dev *wdev)
1295 {
1296 wdev_lock(wdev);
1297 __cfg80211_leave(rdev, wdev);
1298 wdev_unlock(wdev);
1299 }
1300
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1301 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1302 gfp_t gfp)
1303 {
1304 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1305 struct cfg80211_event *ev;
1306 unsigned long flags;
1307
1308 trace_cfg80211_stop_iface(wiphy, wdev);
1309
1310 ev = kzalloc(sizeof(*ev), gfp);
1311 if (!ev)
1312 return;
1313
1314 ev->type = EVENT_STOPPED;
1315
1316 spin_lock_irqsave(&wdev->event_lock, flags);
1317 list_add_tail(&ev->list, &wdev->event_list);
1318 spin_unlock_irqrestore(&wdev->event_lock, flags);
1319 queue_work(cfg80211_wq, &rdev->event_work);
1320 }
1321 EXPORT_SYMBOL(cfg80211_stop_iface);
1322
cfg80211_init_wdev(struct wireless_dev * wdev)1323 void cfg80211_init_wdev(struct wireless_dev *wdev)
1324 {
1325 mutex_init(&wdev->mtx);
1326 INIT_LIST_HEAD(&wdev->event_list);
1327 spin_lock_init(&wdev->event_lock);
1328 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1329 INIT_LIST_HEAD(&wdev->pmsr_list);
1330 spin_lock_init(&wdev->pmsr_lock);
1331 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1332
1333 #ifdef CONFIG_CFG80211_WEXT
1334 wdev->wext.default_key = -1;
1335 wdev->wext.default_mgmt_key = -1;
1336 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1337 #endif
1338
1339 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1340 wdev->ps = true;
1341 else
1342 wdev->ps = false;
1343 /* allow mac80211 to determine the timeout */
1344 wdev->ps_timeout = -1;
1345
1346 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1347 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1348 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1349 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1350
1351 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1352 }
1353
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1354 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1355 struct wireless_dev *wdev)
1356 {
1357 ASSERT_RTNL();
1358 lockdep_assert_held(&rdev->wiphy.mtx);
1359
1360 /*
1361 * We get here also when the interface changes network namespaces,
1362 * as it's registered into the new one, but we don't want it to
1363 * change ID in that case. Checking if the ID is already assigned
1364 * works, because 0 isn't considered a valid ID and the memory is
1365 * 0-initialized.
1366 */
1367 if (!wdev->identifier)
1368 wdev->identifier = ++rdev->wdev_id;
1369 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1370 rdev->devlist_generation++;
1371 wdev->registered = true;
1372
1373 if (wdev->netdev &&
1374 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1375 "phy80211"))
1376 pr_err("failed to add phy80211 symlink to netdev!\n");
1377
1378 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1379 }
1380
cfg80211_register_netdevice(struct net_device * dev)1381 int cfg80211_register_netdevice(struct net_device *dev)
1382 {
1383 struct wireless_dev *wdev = dev->ieee80211_ptr;
1384 struct cfg80211_registered_device *rdev;
1385 int ret;
1386
1387 ASSERT_RTNL();
1388
1389 if (WARN_ON(!wdev))
1390 return -EINVAL;
1391
1392 rdev = wiphy_to_rdev(wdev->wiphy);
1393
1394 lockdep_assert_held(&rdev->wiphy.mtx);
1395
1396 /* we'll take care of this */
1397 wdev->registered = true;
1398 wdev->registering = true;
1399 ret = register_netdevice(dev);
1400 if (ret)
1401 goto out;
1402
1403 cfg80211_register_wdev(rdev, wdev);
1404 ret = 0;
1405 out:
1406 wdev->registering = false;
1407 if (ret)
1408 wdev->registered = false;
1409 return ret;
1410 }
1411 EXPORT_SYMBOL(cfg80211_register_netdevice);
1412
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1413 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1414 unsigned long state, void *ptr)
1415 {
1416 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1417 struct wireless_dev *wdev = dev->ieee80211_ptr;
1418 struct cfg80211_registered_device *rdev;
1419 struct cfg80211_sched_scan_request *pos, *tmp;
1420
1421 if (!wdev)
1422 return NOTIFY_DONE;
1423
1424 rdev = wiphy_to_rdev(wdev->wiphy);
1425
1426 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1427
1428 switch (state) {
1429 case NETDEV_POST_INIT:
1430 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1431 wdev->netdev = dev;
1432 /* can only change netns with wiphy */
1433 dev->features |= NETIF_F_NETNS_LOCAL;
1434
1435 cfg80211_init_wdev(wdev);
1436 break;
1437 case NETDEV_REGISTER:
1438 if (!wdev->registered) {
1439 wiphy_lock(&rdev->wiphy);
1440 cfg80211_register_wdev(rdev, wdev);
1441 wiphy_unlock(&rdev->wiphy);
1442 }
1443 break;
1444 case NETDEV_UNREGISTER:
1445 /*
1446 * It is possible to get NETDEV_UNREGISTER multiple times,
1447 * so check wdev->registered.
1448 */
1449 if (wdev->registered && !wdev->registering) {
1450 wiphy_lock(&rdev->wiphy);
1451 _cfg80211_unregister_wdev(wdev, false);
1452 wiphy_unlock(&rdev->wiphy);
1453 }
1454 break;
1455 case NETDEV_GOING_DOWN:
1456 wiphy_lock(&rdev->wiphy);
1457 cfg80211_leave(rdev, wdev);
1458 cfg80211_remove_links(wdev);
1459 wiphy_unlock(&rdev->wiphy);
1460 break;
1461 case NETDEV_DOWN:
1462 wiphy_lock(&rdev->wiphy);
1463 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1464 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1465 if (WARN_ON(!rdev->scan_req->notified &&
1466 (!rdev->int_scan_req ||
1467 !rdev->int_scan_req->notified)))
1468 rdev->scan_req->info.aborted = true;
1469 ___cfg80211_scan_done(rdev, false);
1470 }
1471
1472 list_for_each_entry_safe(pos, tmp,
1473 &rdev->sched_scan_req_list, list) {
1474 if (WARN_ON(pos->dev == wdev->netdev))
1475 cfg80211_stop_sched_scan_req(rdev, pos, false);
1476 }
1477
1478 rdev->opencount--;
1479 wiphy_unlock(&rdev->wiphy);
1480 wake_up(&rdev->dev_wait);
1481 break;
1482 case NETDEV_UP:
1483 wiphy_lock(&rdev->wiphy);
1484 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1485 wdev_lock(wdev);
1486 switch (wdev->iftype) {
1487 #ifdef CONFIG_CFG80211_WEXT
1488 case NL80211_IFTYPE_ADHOC:
1489 cfg80211_ibss_wext_join(rdev, wdev);
1490 break;
1491 case NL80211_IFTYPE_STATION:
1492 cfg80211_mgd_wext_connect(rdev, wdev);
1493 break;
1494 #endif
1495 #ifdef CONFIG_MAC80211_MESH
1496 case NL80211_IFTYPE_MESH_POINT:
1497 {
1498 /* backward compat code... */
1499 struct mesh_setup setup;
1500 memcpy(&setup, &default_mesh_setup,
1501 sizeof(setup));
1502 /* back compat only needed for mesh_id */
1503 setup.mesh_id = wdev->u.mesh.id;
1504 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1505 if (wdev->u.mesh.id_up_len)
1506 __cfg80211_join_mesh(rdev, dev,
1507 &setup,
1508 &default_mesh_config);
1509 break;
1510 }
1511 #endif
1512 default:
1513 break;
1514 }
1515 wdev_unlock(wdev);
1516 rdev->opencount++;
1517
1518 /*
1519 * Configure power management to the driver here so that its
1520 * correctly set also after interface type changes etc.
1521 */
1522 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1523 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1524 rdev->ops->set_power_mgmt &&
1525 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1526 wdev->ps_timeout)) {
1527 /* assume this means it's off */
1528 wdev->ps = false;
1529 }
1530 wiphy_unlock(&rdev->wiphy);
1531 break;
1532 case NETDEV_PRE_UP:
1533 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1534 wdev->use_4addr, 0))
1535 return notifier_from_errno(-EOPNOTSUPP);
1536
1537 if (rfkill_blocked(rdev->wiphy.rfkill))
1538 return notifier_from_errno(-ERFKILL);
1539 break;
1540 default:
1541 return NOTIFY_DONE;
1542 }
1543
1544 wireless_nlevent_flush();
1545
1546 return NOTIFY_OK;
1547 }
1548
1549 static struct notifier_block cfg80211_netdev_notifier = {
1550 .notifier_call = cfg80211_netdev_notifier_call,
1551 };
1552
cfg80211_pernet_exit(struct net * net)1553 static void __net_exit cfg80211_pernet_exit(struct net *net)
1554 {
1555 struct cfg80211_registered_device *rdev;
1556
1557 rtnl_lock();
1558 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1559 if (net_eq(wiphy_net(&rdev->wiphy), net))
1560 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1561 }
1562 rtnl_unlock();
1563 }
1564
1565 static struct pernet_operations cfg80211_pernet_ops = {
1566 .exit = cfg80211_pernet_exit,
1567 };
1568
cfg80211_init(void)1569 static int __init cfg80211_init(void)
1570 {
1571 int err;
1572
1573 err = register_pernet_device(&cfg80211_pernet_ops);
1574 if (err)
1575 goto out_fail_pernet;
1576
1577 err = wiphy_sysfs_init();
1578 if (err)
1579 goto out_fail_sysfs;
1580
1581 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1582 if (err)
1583 goto out_fail_notifier;
1584
1585 err = nl80211_init();
1586 if (err)
1587 goto out_fail_nl80211;
1588
1589 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1590
1591 err = regulatory_init();
1592 if (err)
1593 goto out_fail_reg;
1594
1595 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1596 if (!cfg80211_wq) {
1597 err = -ENOMEM;
1598 goto out_fail_wq;
1599 }
1600
1601 return 0;
1602
1603 out_fail_wq:
1604 regulatory_exit();
1605 out_fail_reg:
1606 debugfs_remove(ieee80211_debugfs_dir);
1607 nl80211_exit();
1608 out_fail_nl80211:
1609 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1610 out_fail_notifier:
1611 wiphy_sysfs_exit();
1612 out_fail_sysfs:
1613 unregister_pernet_device(&cfg80211_pernet_ops);
1614 out_fail_pernet:
1615 return err;
1616 }
1617 fs_initcall(cfg80211_init);
1618
cfg80211_exit(void)1619 static void __exit cfg80211_exit(void)
1620 {
1621 debugfs_remove(ieee80211_debugfs_dir);
1622 nl80211_exit();
1623 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1624 wiphy_sysfs_exit();
1625 regulatory_exit();
1626 unregister_pernet_device(&cfg80211_pernet_ops);
1627 destroy_workqueue(cfg80211_wq);
1628 }
1629 module_exit(cfg80211_exit);
1630