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) 2018-2021 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 rdev_rfkill_poll(rdev);
220 }
221
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
223 struct wireless_dev *wdev)
224 {
225 lockdep_assert_held(&rdev->wiphy.mtx);
226
227 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
228 return;
229
230 if (!wdev_running(wdev))
231 return;
232
233 rdev_stop_p2p_device(rdev, wdev);
234 wdev->is_running = false;
235
236 rdev->opencount--;
237
238 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
239 if (WARN_ON(!rdev->scan_req->notified &&
240 (!rdev->int_scan_req ||
241 !rdev->int_scan_req->notified)))
242 rdev->scan_req->info.aborted = true;
243 ___cfg80211_scan_done(rdev, false);
244 }
245 }
246
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
248 struct wireless_dev *wdev)
249 {
250 lockdep_assert_held(&rdev->wiphy.mtx);
251
252 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
253 return;
254
255 if (!wdev_running(wdev))
256 return;
257
258 rdev_stop_nan(rdev, wdev);
259 wdev->is_running = false;
260
261 rdev->opencount--;
262 }
263
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
265 {
266 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
267 struct wireless_dev *wdev;
268
269 ASSERT_RTNL();
270
271 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
272 if (wdev->netdev) {
273 dev_close(wdev->netdev);
274 continue;
275 }
276
277 /* otherwise, check iftype */
278
279 wiphy_lock(wiphy);
280
281 switch (wdev->iftype) {
282 case NL80211_IFTYPE_P2P_DEVICE:
283 cfg80211_stop_p2p_device(rdev, wdev);
284 break;
285 case NL80211_IFTYPE_NAN:
286 cfg80211_stop_nan(rdev, wdev);
287 break;
288 default:
289 break;
290 }
291
292 wiphy_unlock(wiphy);
293 }
294 }
295 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
296
cfg80211_rfkill_set_block(void * data,bool blocked)297 static int cfg80211_rfkill_set_block(void *data, bool blocked)
298 {
299 struct cfg80211_registered_device *rdev = data;
300
301 if (!blocked)
302 return 0;
303
304 rtnl_lock();
305 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
306 rtnl_unlock();
307
308 return 0;
309 }
310
cfg80211_rfkill_block_work(struct work_struct * work)311 static void cfg80211_rfkill_block_work(struct work_struct *work)
312 {
313 struct cfg80211_registered_device *rdev;
314
315 rdev = container_of(work, struct cfg80211_registered_device,
316 rfkill_block);
317 cfg80211_rfkill_set_block(rdev, true);
318 }
319
cfg80211_event_work(struct work_struct * work)320 static void cfg80211_event_work(struct work_struct *work)
321 {
322 struct cfg80211_registered_device *rdev;
323
324 rdev = container_of(work, struct cfg80211_registered_device,
325 event_work);
326
327 wiphy_lock(&rdev->wiphy);
328 cfg80211_process_rdev_events(rdev);
329 wiphy_unlock(&rdev->wiphy);
330 }
331
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)332 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
333 {
334 struct wireless_dev *wdev, *tmp;
335 bool found = false;
336
337 ASSERT_RTNL();
338
339 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
340 if (wdev->nl_owner_dead) {
341 if (wdev->netdev)
342 dev_close(wdev->netdev);
343 found = true;
344 }
345 }
346
347 if (!found)
348 return;
349
350 wiphy_lock(&rdev->wiphy);
351 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
352 if (wdev->nl_owner_dead) {
353 cfg80211_leave(rdev, wdev);
354 rdev_del_virtual_intf(rdev, wdev);
355 }
356 }
357 wiphy_unlock(&rdev->wiphy);
358 }
359
cfg80211_destroy_iface_wk(struct work_struct * work)360 static void cfg80211_destroy_iface_wk(struct work_struct *work)
361 {
362 struct cfg80211_registered_device *rdev;
363
364 rdev = container_of(work, struct cfg80211_registered_device,
365 destroy_work);
366
367 rtnl_lock();
368 cfg80211_destroy_ifaces(rdev);
369 rtnl_unlock();
370 }
371
cfg80211_sched_scan_stop_wk(struct work_struct * work)372 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
373 {
374 struct cfg80211_registered_device *rdev;
375 struct cfg80211_sched_scan_request *req, *tmp;
376
377 rdev = container_of(work, struct cfg80211_registered_device,
378 sched_scan_stop_wk);
379
380 rtnl_lock();
381 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
382 if (req->nl_owner_dead)
383 cfg80211_stop_sched_scan_req(rdev, req, false);
384 }
385 rtnl_unlock();
386 }
387
cfg80211_propagate_radar_detect_wk(struct work_struct * work)388 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
389 {
390 struct cfg80211_registered_device *rdev;
391
392 rdev = container_of(work, struct cfg80211_registered_device,
393 propagate_radar_detect_wk);
394
395 rtnl_lock();
396
397 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
398 NL80211_DFS_UNAVAILABLE,
399 NL80211_RADAR_DETECTED);
400
401 rtnl_unlock();
402 }
403
cfg80211_propagate_cac_done_wk(struct work_struct * work)404 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
405 {
406 struct cfg80211_registered_device *rdev;
407
408 rdev = container_of(work, struct cfg80211_registered_device,
409 propagate_cac_done_wk);
410
411 rtnl_lock();
412
413 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
414 NL80211_DFS_AVAILABLE,
415 NL80211_RADAR_CAC_FINISHED);
416
417 rtnl_unlock();
418 }
419
420 /* exported functions */
421
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)422 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
423 const char *requested_name)
424 {
425 static atomic_t wiphy_counter = ATOMIC_INIT(0);
426
427 struct cfg80211_registered_device *rdev;
428 int alloc_size;
429
430 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
431 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
432 WARN_ON(ops->connect && !ops->disconnect);
433 WARN_ON(ops->join_ibss && !ops->leave_ibss);
434 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
435 WARN_ON(ops->add_station && !ops->del_station);
436 WARN_ON(ops->add_mpath && !ops->del_mpath);
437 WARN_ON(ops->join_mesh && !ops->leave_mesh);
438 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
439 WARN_ON(ops->start_ap && !ops->stop_ap);
440 WARN_ON(ops->join_ocb && !ops->leave_ocb);
441 WARN_ON(ops->suspend && !ops->resume);
442 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
443 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
444 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
445 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
446
447 alloc_size = sizeof(*rdev) + sizeof_priv;
448
449 rdev = kzalloc(alloc_size, GFP_KERNEL);
450 if (!rdev)
451 return NULL;
452
453 rdev->ops = ops;
454
455 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
456
457 if (unlikely(rdev->wiphy_idx < 0)) {
458 /* ugh, wrapped! */
459 atomic_dec(&wiphy_counter);
460 kfree(rdev);
461 return NULL;
462 }
463
464 /* atomic_inc_return makes it start at 1, make it start at 0 */
465 rdev->wiphy_idx--;
466
467 /* give it a proper name */
468 if (requested_name && requested_name[0]) {
469 int rv;
470
471 rtnl_lock();
472 rv = cfg80211_dev_check_name(rdev, requested_name);
473
474 if (rv < 0) {
475 rtnl_unlock();
476 goto use_default_name;
477 }
478
479 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
480 rtnl_unlock();
481 if (rv)
482 goto use_default_name;
483 } else {
484 int rv;
485
486 use_default_name:
487 /* NOTE: This is *probably* safe w/out holding rtnl because of
488 * the restrictions on phy names. Probably this call could
489 * fail if some other part of the kernel (re)named a device
490 * phyX. But, might should add some locking and check return
491 * value, and use a different name if this one exists?
492 */
493 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
494 if (rv < 0) {
495 kfree(rdev);
496 return NULL;
497 }
498 }
499
500 mutex_init(&rdev->wiphy.mtx);
501 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
502 INIT_LIST_HEAD(&rdev->beacon_registrations);
503 spin_lock_init(&rdev->beacon_registrations_lock);
504 spin_lock_init(&rdev->bss_lock);
505 INIT_LIST_HEAD(&rdev->bss_list);
506 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
507 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
508 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
509 cfg80211_dfs_channels_update_work);
510 #ifdef CONFIG_CFG80211_WEXT
511 rdev->wiphy.wext = &cfg80211_wext_handler;
512 #endif
513
514 device_initialize(&rdev->wiphy.dev);
515 rdev->wiphy.dev.class = &ieee80211_class;
516 rdev->wiphy.dev.platform_data = rdev;
517 device_enable_async_suspend(&rdev->wiphy.dev);
518
519 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
520 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
521 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
522 INIT_WORK(&rdev->propagate_radar_detect_wk,
523 cfg80211_propagate_radar_detect_wk);
524 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
525 INIT_WORK(&rdev->mgmt_registrations_update_wk,
526 cfg80211_mgmt_registrations_update_wk);
527 spin_lock_init(&rdev->mgmt_registrations_lock);
528
529 #ifdef CONFIG_CFG80211_DEFAULT_PS
530 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
531 #endif
532
533 wiphy_net_set(&rdev->wiphy, &init_net);
534
535 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
536 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
537 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
538 &rdev->rfkill_ops, rdev);
539
540 if (!rdev->wiphy.rfkill) {
541 wiphy_free(&rdev->wiphy);
542 return NULL;
543 }
544
545 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
546 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
547 INIT_WORK(&rdev->event_work, cfg80211_event_work);
548
549 init_waitqueue_head(&rdev->dev_wait);
550
551 /*
552 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
553 * Fragmentation and RTS threshold are disabled by default with the
554 * special -1 value.
555 */
556 rdev->wiphy.retry_short = 7;
557 rdev->wiphy.retry_long = 4;
558 rdev->wiphy.frag_threshold = (u32) -1;
559 rdev->wiphy.rts_threshold = (u32) -1;
560 rdev->wiphy.coverage_class = 0;
561
562 rdev->wiphy.max_num_csa_counters = 1;
563
564 rdev->wiphy.max_sched_scan_plans = 1;
565 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
566
567 return &rdev->wiphy;
568 }
569 EXPORT_SYMBOL(wiphy_new_nm);
570
wiphy_verify_combinations(struct wiphy * wiphy)571 static int wiphy_verify_combinations(struct wiphy *wiphy)
572 {
573 const struct ieee80211_iface_combination *c;
574 int i, j;
575
576 for (i = 0; i < wiphy->n_iface_combinations; i++) {
577 u32 cnt = 0;
578 u16 all_iftypes = 0;
579
580 c = &wiphy->iface_combinations[i];
581
582 /*
583 * Combinations with just one interface aren't real,
584 * however we make an exception for DFS.
585 */
586 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
587 return -EINVAL;
588
589 /* Need at least one channel */
590 if (WARN_ON(!c->num_different_channels))
591 return -EINVAL;
592
593 /* DFS only works on one channel. */
594 if (WARN_ON(c->radar_detect_widths &&
595 (c->num_different_channels > 1)))
596 return -EINVAL;
597
598 if (WARN_ON(!c->n_limits))
599 return -EINVAL;
600
601 for (j = 0; j < c->n_limits; j++) {
602 u16 types = c->limits[j].types;
603
604 /* interface types shouldn't overlap */
605 if (WARN_ON(types & all_iftypes))
606 return -EINVAL;
607 all_iftypes |= types;
608
609 if (WARN_ON(!c->limits[j].max))
610 return -EINVAL;
611
612 /* Shouldn't list software iftypes in combinations! */
613 if (WARN_ON(wiphy->software_iftypes & types))
614 return -EINVAL;
615
616 /* Only a single P2P_DEVICE can be allowed */
617 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
618 c->limits[j].max > 1))
619 return -EINVAL;
620
621 /* Only a single NAN can be allowed */
622 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
623 c->limits[j].max > 1))
624 return -EINVAL;
625
626 /*
627 * This isn't well-defined right now. If you have an
628 * IBSS interface, then its beacon interval may change
629 * by joining other networks, and nothing prevents it
630 * from doing that.
631 * So technically we probably shouldn't even allow AP
632 * and IBSS in the same interface, but it seems that
633 * some drivers support that, possibly only with fixed
634 * beacon intervals for IBSS.
635 */
636 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
637 c->beacon_int_min_gcd)) {
638 return -EINVAL;
639 }
640
641 cnt += c->limits[j].max;
642 /*
643 * Don't advertise an unsupported type
644 * in a combination.
645 */
646 if (WARN_ON((wiphy->interface_modes & types) != types))
647 return -EINVAL;
648 }
649
650 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
651 return -EINVAL;
652
653 /* You can't even choose that many! */
654 if (WARN_ON(cnt < c->max_interfaces))
655 return -EINVAL;
656 }
657
658 return 0;
659 }
660
wiphy_register(struct wiphy * wiphy)661 int wiphy_register(struct wiphy *wiphy)
662 {
663 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
664 int res;
665 enum nl80211_band band;
666 struct ieee80211_supported_band *sband;
667 bool have_band = false;
668 int i;
669 u16 ifmodes = wiphy->interface_modes;
670
671 #ifdef CONFIG_PM
672 if (WARN_ON(wiphy->wowlan &&
673 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
674 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
675 return -EINVAL;
676 if (WARN_ON(wiphy->wowlan &&
677 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
678 !wiphy->wowlan->tcp))
679 return -EINVAL;
680 #endif
681 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
682 (!rdev->ops->tdls_channel_switch ||
683 !rdev->ops->tdls_cancel_channel_switch)))
684 return -EINVAL;
685
686 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
687 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
688 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
689 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
690 return -EINVAL;
691
692 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
693 return -EINVAL;
694
695 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
696 return -EINVAL;
697
698 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
699 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
700 !wiphy->pmsr_capa->ftm.non_asap))
701 return -EINVAL;
702 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
703 !wiphy->pmsr_capa->ftm.bandwidths))
704 return -EINVAL;
705 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
706 ~(BIT(NL80211_PREAMBLE_LEGACY) |
707 BIT(NL80211_PREAMBLE_HT) |
708 BIT(NL80211_PREAMBLE_VHT) |
709 BIT(NL80211_PREAMBLE_HE) |
710 BIT(NL80211_PREAMBLE_DMG))))
711 return -EINVAL;
712 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
713 wiphy->pmsr_capa->ftm.non_trigger_based) &&
714 !(wiphy->pmsr_capa->ftm.preambles &
715 BIT(NL80211_PREAMBLE_HE))))
716 return -EINVAL;
717 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
718 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
719 BIT(NL80211_CHAN_WIDTH_20) |
720 BIT(NL80211_CHAN_WIDTH_40) |
721 BIT(NL80211_CHAN_WIDTH_80) |
722 BIT(NL80211_CHAN_WIDTH_80P80) |
723 BIT(NL80211_CHAN_WIDTH_160) |
724 BIT(NL80211_CHAN_WIDTH_5) |
725 BIT(NL80211_CHAN_WIDTH_10))))
726 return -EINVAL;
727 }
728
729 /*
730 * if a wiphy has unsupported modes for regulatory channel enforcement,
731 * opt-out of enforcement checking
732 */
733 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
734 BIT(NL80211_IFTYPE_P2P_CLIENT) |
735 BIT(NL80211_IFTYPE_AP) |
736 BIT(NL80211_IFTYPE_P2P_GO) |
737 BIT(NL80211_IFTYPE_ADHOC) |
738 BIT(NL80211_IFTYPE_P2P_DEVICE) |
739 BIT(NL80211_IFTYPE_NAN) |
740 BIT(NL80211_IFTYPE_AP_VLAN) |
741 BIT(NL80211_IFTYPE_MONITOR)))
742 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
743
744 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
745 (wiphy->regulatory_flags &
746 (REGULATORY_CUSTOM_REG |
747 REGULATORY_STRICT_REG |
748 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
749 REGULATORY_COUNTRY_IE_IGNORE))))
750 return -EINVAL;
751
752 if (WARN_ON(wiphy->coalesce &&
753 (!wiphy->coalesce->n_rules ||
754 !wiphy->coalesce->n_patterns) &&
755 (!wiphy->coalesce->pattern_min_len ||
756 wiphy->coalesce->pattern_min_len >
757 wiphy->coalesce->pattern_max_len)))
758 return -EINVAL;
759
760 if (WARN_ON(wiphy->ap_sme_capa &&
761 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
762 return -EINVAL;
763
764 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
765 return -EINVAL;
766
767 if (WARN_ON(wiphy->addresses &&
768 !is_zero_ether_addr(wiphy->perm_addr) &&
769 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
770 ETH_ALEN)))
771 return -EINVAL;
772
773 if (WARN_ON(wiphy->max_acl_mac_addrs &&
774 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
775 !rdev->ops->set_mac_acl)))
776 return -EINVAL;
777
778 /* assure only valid behaviours are flagged by driver
779 * hence subtract 2 as bit 0 is invalid.
780 */
781 if (WARN_ON(wiphy->bss_select_support &&
782 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
783 return -EINVAL;
784
785 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
786 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
787 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
788 return -EINVAL;
789
790 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
791 rdev->ops->update_connect_params))
792 return -EINVAL;
793
794 if (wiphy->addresses)
795 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
796
797 /* sanity check ifmodes */
798 WARN_ON(!ifmodes);
799 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
800 if (WARN_ON(ifmodes != wiphy->interface_modes))
801 wiphy->interface_modes = ifmodes;
802
803 res = wiphy_verify_combinations(wiphy);
804 if (res)
805 return res;
806
807 /* sanity check supported bands/channels */
808 for (band = 0; band < NUM_NL80211_BANDS; band++) {
809 u16 types = 0;
810 bool have_he = false;
811
812 sband = wiphy->bands[band];
813 if (!sband)
814 continue;
815
816 sband->band = band;
817 if (WARN_ON(!sband->n_channels))
818 return -EINVAL;
819 /*
820 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
821 * n_bitrates is 0
822 */
823 if (WARN_ON((band != NL80211_BAND_60GHZ &&
824 band != NL80211_BAND_S1GHZ) &&
825 !sband->n_bitrates))
826 return -EINVAL;
827
828 if (WARN_ON(band == NL80211_BAND_6GHZ &&
829 (sband->ht_cap.ht_supported ||
830 sband->vht_cap.vht_supported)))
831 return -EINVAL;
832
833 /*
834 * Since cfg80211_disable_40mhz_24ghz is global, we can
835 * modify the sband's ht data even if the driver uses a
836 * global structure for that.
837 */
838 if (cfg80211_disable_40mhz_24ghz &&
839 band == NL80211_BAND_2GHZ &&
840 sband->ht_cap.ht_supported) {
841 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
842 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
843 }
844
845 /*
846 * Since we use a u32 for rate bitmaps in
847 * ieee80211_get_response_rate, we cannot
848 * have more than 32 legacy rates.
849 */
850 if (WARN_ON(sband->n_bitrates > 32))
851 return -EINVAL;
852
853 for (i = 0; i < sband->n_channels; i++) {
854 sband->channels[i].orig_flags =
855 sband->channels[i].flags;
856 sband->channels[i].orig_mag = INT_MAX;
857 sband->channels[i].orig_mpwr =
858 sband->channels[i].max_power;
859 sband->channels[i].band = band;
860
861 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
862 return -EINVAL;
863 }
864
865 for (i = 0; i < sband->n_iftype_data; i++) {
866 const struct ieee80211_sband_iftype_data *iftd;
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
888 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
889 return -EINVAL;
890
891 have_band = true;
892 }
893
894 if (!have_band) {
895 WARN_ON(1);
896 return -EINVAL;
897 }
898
899 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
900 /*
901 * Validate we have a policy (can be explicitly set to
902 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
903 * we have at least one of doit/dumpit.
904 */
905 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
906 return -EINVAL;
907 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
908 !rdev->wiphy.vendor_commands[i].dumpit))
909 return -EINVAL;
910 }
911
912 #ifdef CONFIG_PM
913 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
914 (!rdev->wiphy.wowlan->pattern_min_len ||
915 rdev->wiphy.wowlan->pattern_min_len >
916 rdev->wiphy.wowlan->pattern_max_len)))
917 return -EINVAL;
918 #endif
919
920 /* check and set up bitrates */
921 ieee80211_set_bitrate_flags(wiphy);
922
923 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
924
925 rtnl_lock();
926 res = device_add(&rdev->wiphy.dev);
927 if (res) {
928 rtnl_unlock();
929 return res;
930 }
931
932 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
933 cfg80211_rdev_list_generation++;
934
935 /* add to debugfs */
936 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
937 ieee80211_debugfs_dir);
938
939 cfg80211_debugfs_rdev_add(rdev);
940 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
941
942 /* set up regulatory info */
943 wiphy_regulatory_register(wiphy);
944
945 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
946 struct regulatory_request request;
947
948 request.wiphy_idx = get_wiphy_idx(wiphy);
949 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
950 request.alpha2[0] = '9';
951 request.alpha2[1] = '9';
952
953 nl80211_send_reg_change_event(&request);
954 }
955
956 /* Check that nobody globally advertises any capabilities they do not
957 * advertise on all possible interface types.
958 */
959 if (wiphy->extended_capabilities_len &&
960 wiphy->num_iftype_ext_capab &&
961 wiphy->iftype_ext_capab) {
962 u8 supported_on_all, j;
963 const struct wiphy_iftype_ext_capab *capab;
964
965 capab = wiphy->iftype_ext_capab;
966 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
967 if (capab[0].extended_capabilities_len > j)
968 supported_on_all =
969 capab[0].extended_capabilities[j];
970 else
971 supported_on_all = 0x00;
972 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
973 if (j >= capab[i].extended_capabilities_len) {
974 supported_on_all = 0x00;
975 break;
976 }
977 supported_on_all &=
978 capab[i].extended_capabilities[j];
979 }
980 if (WARN_ON(wiphy->extended_capabilities[j] &
981 ~supported_on_all))
982 break;
983 }
984 }
985
986 rdev->wiphy.registered = true;
987 rtnl_unlock();
988
989 res = rfkill_register(rdev->wiphy.rfkill);
990 if (res) {
991 rfkill_destroy(rdev->wiphy.rfkill);
992 rdev->wiphy.rfkill = NULL;
993 wiphy_unregister(&rdev->wiphy);
994 return res;
995 }
996
997 return 0;
998 }
999 EXPORT_SYMBOL(wiphy_register);
1000
wiphy_rfkill_start_polling(struct wiphy * wiphy)1001 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1002 {
1003 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1004
1005 if (!rdev->ops->rfkill_poll)
1006 return;
1007 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1008 rfkill_resume_polling(wiphy->rfkill);
1009 }
1010 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1011
wiphy_unregister(struct wiphy * wiphy)1012 void wiphy_unregister(struct wiphy *wiphy)
1013 {
1014 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1015
1016 wait_event(rdev->dev_wait, ({
1017 int __count;
1018 wiphy_lock(&rdev->wiphy);
1019 __count = rdev->opencount;
1020 wiphy_unlock(&rdev->wiphy);
1021 __count == 0; }));
1022
1023 if (rdev->wiphy.rfkill)
1024 rfkill_unregister(rdev->wiphy.rfkill);
1025
1026 rtnl_lock();
1027 wiphy_lock(&rdev->wiphy);
1028 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1029 rdev->wiphy.registered = false;
1030
1031 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1032
1033 /*
1034 * First remove the hardware from everywhere, this makes
1035 * it impossible to find from userspace.
1036 */
1037 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1038 list_del_rcu(&rdev->list);
1039 synchronize_rcu();
1040
1041 /*
1042 * If this device got a regulatory hint tell core its
1043 * free to listen now to a new shiny device regulatory hint
1044 */
1045 wiphy_regulatory_deregister(wiphy);
1046
1047 cfg80211_rdev_list_generation++;
1048 device_del(&rdev->wiphy.dev);
1049
1050 wiphy_unlock(&rdev->wiphy);
1051 rtnl_unlock();
1052
1053 flush_work(&rdev->scan_done_wk);
1054 cancel_work_sync(&rdev->conn_work);
1055 flush_work(&rdev->event_work);
1056 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1057 flush_work(&rdev->destroy_work);
1058 flush_work(&rdev->sched_scan_stop_wk);
1059 flush_work(&rdev->propagate_radar_detect_wk);
1060 flush_work(&rdev->propagate_cac_done_wk);
1061 flush_work(&rdev->mgmt_registrations_update_wk);
1062
1063 #ifdef CONFIG_PM
1064 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1065 rdev_set_wakeup(rdev, false);
1066 #endif
1067 cfg80211_rdev_free_wowlan(rdev);
1068 cfg80211_rdev_free_coalesce(rdev);
1069 }
1070 EXPORT_SYMBOL(wiphy_unregister);
1071
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1072 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1073 {
1074 struct cfg80211_internal_bss *scan, *tmp;
1075 struct cfg80211_beacon_registration *reg, *treg;
1076 rfkill_destroy(rdev->wiphy.rfkill);
1077 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1078 list_del(®->list);
1079 kfree(reg);
1080 }
1081 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1082 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1083 mutex_destroy(&rdev->wiphy.mtx);
1084
1085 /*
1086 * The 'regd' can only be non-NULL if we never finished
1087 * initializing the wiphy and thus never went through the
1088 * unregister path - e.g. in failure scenarios. Thus, it
1089 * cannot have been visible to anyone if non-NULL, so we
1090 * can just free it here.
1091 */
1092 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1093
1094 kfree(rdev);
1095 }
1096
wiphy_free(struct wiphy * wiphy)1097 void wiphy_free(struct wiphy *wiphy)
1098 {
1099 put_device(&wiphy->dev);
1100 }
1101 EXPORT_SYMBOL(wiphy_free);
1102
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1103 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1104 enum rfkill_hard_block_reasons reason)
1105 {
1106 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1107
1108 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1109 schedule_work(&rdev->rfkill_block);
1110 }
1111 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1112
cfg80211_cqm_config_free(struct wireless_dev * wdev)1113 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1114 {
1115 kfree(wdev->cqm_config);
1116 wdev->cqm_config = NULL;
1117 }
1118
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1119 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1120 bool unregister_netdev)
1121 {
1122 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1123
1124 ASSERT_RTNL();
1125 lockdep_assert_held(&rdev->wiphy.mtx);
1126
1127 flush_work(&wdev->pmsr_free_wk);
1128
1129 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1130
1131 wdev->registered = false;
1132
1133 if (wdev->netdev) {
1134 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1135 if (unregister_netdev)
1136 unregister_netdevice(wdev->netdev);
1137 }
1138
1139 list_del_rcu(&wdev->list);
1140 synchronize_net();
1141 rdev->devlist_generation++;
1142
1143 cfg80211_mlme_purge_registrations(wdev);
1144
1145 switch (wdev->iftype) {
1146 case NL80211_IFTYPE_P2P_DEVICE:
1147 cfg80211_stop_p2p_device(rdev, wdev);
1148 break;
1149 case NL80211_IFTYPE_NAN:
1150 cfg80211_stop_nan(rdev, wdev);
1151 break;
1152 default:
1153 break;
1154 }
1155
1156 #ifdef CONFIG_CFG80211_WEXT
1157 kfree_sensitive(wdev->wext.keys);
1158 wdev->wext.keys = NULL;
1159 #endif
1160 /* only initialized if we have a netdev */
1161 if (wdev->netdev)
1162 flush_work(&wdev->disconnect_wk);
1163
1164 cfg80211_cqm_config_free(wdev);
1165
1166 /*
1167 * Ensure that all events have been processed and
1168 * freed.
1169 */
1170 cfg80211_process_wdev_events(wdev);
1171
1172 if (WARN_ON(wdev->current_bss)) {
1173 cfg80211_unhold_bss(wdev->current_bss);
1174 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1175 wdev->current_bss = NULL;
1176 }
1177 }
1178
cfg80211_unregister_wdev(struct wireless_dev * wdev)1179 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1180 {
1181 _cfg80211_unregister_wdev(wdev, true);
1182 }
1183 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1184
1185 static const struct device_type wiphy_type = {
1186 .name = "wlan",
1187 };
1188
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1189 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1190 enum nl80211_iftype iftype, int num)
1191 {
1192 lockdep_assert_held(&rdev->wiphy.mtx);
1193
1194 rdev->num_running_ifaces += num;
1195 if (iftype == NL80211_IFTYPE_MONITOR)
1196 rdev->num_running_monitor_ifaces += num;
1197 }
1198
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1199 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1200 struct wireless_dev *wdev)
1201 {
1202 struct net_device *dev = wdev->netdev;
1203 struct cfg80211_sched_scan_request *pos, *tmp;
1204
1205 lockdep_assert_held(&rdev->wiphy.mtx);
1206 ASSERT_WDEV_LOCK(wdev);
1207
1208 cfg80211_pmsr_wdev_down(wdev);
1209
1210 switch (wdev->iftype) {
1211 case NL80211_IFTYPE_ADHOC:
1212 __cfg80211_leave_ibss(rdev, dev, true);
1213 break;
1214 case NL80211_IFTYPE_P2P_CLIENT:
1215 case NL80211_IFTYPE_STATION:
1216 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1217 list) {
1218 if (dev == pos->dev)
1219 cfg80211_stop_sched_scan_req(rdev, pos, false);
1220 }
1221
1222 #ifdef CONFIG_CFG80211_WEXT
1223 kfree(wdev->wext.ie);
1224 wdev->wext.ie = NULL;
1225 wdev->wext.ie_len = 0;
1226 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1227 #endif
1228 cfg80211_disconnect(rdev, dev,
1229 WLAN_REASON_DEAUTH_LEAVING, true);
1230 break;
1231 case NL80211_IFTYPE_MESH_POINT:
1232 __cfg80211_leave_mesh(rdev, dev);
1233 break;
1234 case NL80211_IFTYPE_AP:
1235 case NL80211_IFTYPE_P2P_GO:
1236 __cfg80211_stop_ap(rdev, dev, true);
1237 break;
1238 case NL80211_IFTYPE_OCB:
1239 __cfg80211_leave_ocb(rdev, dev);
1240 break;
1241 case NL80211_IFTYPE_P2P_DEVICE:
1242 case NL80211_IFTYPE_NAN:
1243 /* cannot happen, has no netdev */
1244 break;
1245 case NL80211_IFTYPE_AP_VLAN:
1246 case NL80211_IFTYPE_MONITOR:
1247 /* nothing to do */
1248 break;
1249 case NL80211_IFTYPE_UNSPECIFIED:
1250 case NL80211_IFTYPE_WDS:
1251 case NUM_NL80211_IFTYPES:
1252 /* invalid */
1253 break;
1254 }
1255 }
1256
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1257 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1258 struct wireless_dev *wdev)
1259 {
1260 wdev_lock(wdev);
1261 __cfg80211_leave(rdev, wdev);
1262 wdev_unlock(wdev);
1263 }
1264
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1265 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1266 gfp_t gfp)
1267 {
1268 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1269 struct cfg80211_event *ev;
1270 unsigned long flags;
1271
1272 trace_cfg80211_stop_iface(wiphy, wdev);
1273
1274 ev = kzalloc(sizeof(*ev), gfp);
1275 if (!ev)
1276 return;
1277
1278 ev->type = EVENT_STOPPED;
1279
1280 spin_lock_irqsave(&wdev->event_lock, flags);
1281 list_add_tail(&ev->list, &wdev->event_list);
1282 spin_unlock_irqrestore(&wdev->event_lock, flags);
1283 queue_work(cfg80211_wq, &rdev->event_work);
1284 }
1285 EXPORT_SYMBOL(cfg80211_stop_iface);
1286
cfg80211_init_wdev(struct wireless_dev * wdev)1287 void cfg80211_init_wdev(struct wireless_dev *wdev)
1288 {
1289 mutex_init(&wdev->mtx);
1290 INIT_LIST_HEAD(&wdev->event_list);
1291 spin_lock_init(&wdev->event_lock);
1292 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1293 INIT_LIST_HEAD(&wdev->pmsr_list);
1294 spin_lock_init(&wdev->pmsr_lock);
1295 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1296
1297 #ifdef CONFIG_CFG80211_WEXT
1298 wdev->wext.default_key = -1;
1299 wdev->wext.default_mgmt_key = -1;
1300 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1301 #endif
1302
1303 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1304 wdev->ps = true;
1305 else
1306 wdev->ps = false;
1307 /* allow mac80211 to determine the timeout */
1308 wdev->ps_timeout = -1;
1309
1310 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1311 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1312 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1313 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1314
1315 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1316 }
1317
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1318 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1319 struct wireless_dev *wdev)
1320 {
1321 ASSERT_RTNL();
1322 lockdep_assert_held(&rdev->wiphy.mtx);
1323
1324 /*
1325 * We get here also when the interface changes network namespaces,
1326 * as it's registered into the new one, but we don't want it to
1327 * change ID in that case. Checking if the ID is already assigned
1328 * works, because 0 isn't considered a valid ID and the memory is
1329 * 0-initialized.
1330 */
1331 if (!wdev->identifier)
1332 wdev->identifier = ++rdev->wdev_id;
1333 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1334 rdev->devlist_generation++;
1335 wdev->registered = true;
1336
1337 if (wdev->netdev &&
1338 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1339 "phy80211"))
1340 pr_err("failed to add phy80211 symlink to netdev!\n");
1341
1342 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1343 }
1344
cfg80211_register_netdevice(struct net_device * dev)1345 int cfg80211_register_netdevice(struct net_device *dev)
1346 {
1347 struct wireless_dev *wdev = dev->ieee80211_ptr;
1348 struct cfg80211_registered_device *rdev;
1349 int ret;
1350
1351 ASSERT_RTNL();
1352
1353 if (WARN_ON(!wdev))
1354 return -EINVAL;
1355
1356 rdev = wiphy_to_rdev(wdev->wiphy);
1357
1358 lockdep_assert_held(&rdev->wiphy.mtx);
1359
1360 /* we'll take care of this */
1361 wdev->registered = true;
1362 wdev->registering = true;
1363 ret = register_netdevice(dev);
1364 if (ret)
1365 goto out;
1366
1367 cfg80211_register_wdev(rdev, wdev);
1368 ret = 0;
1369 out:
1370 wdev->registering = false;
1371 if (ret)
1372 wdev->registered = false;
1373 return ret;
1374 }
1375 EXPORT_SYMBOL(cfg80211_register_netdevice);
1376
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1377 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1378 unsigned long state, void *ptr)
1379 {
1380 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1381 struct wireless_dev *wdev = dev->ieee80211_ptr;
1382 struct cfg80211_registered_device *rdev;
1383 struct cfg80211_sched_scan_request *pos, *tmp;
1384
1385 if (!wdev)
1386 return NOTIFY_DONE;
1387
1388 rdev = wiphy_to_rdev(wdev->wiphy);
1389
1390 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1391
1392 switch (state) {
1393 case NETDEV_POST_INIT:
1394 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1395 wdev->netdev = dev;
1396 /* can only change netns with wiphy */
1397 dev->features |= NETIF_F_NETNS_LOCAL;
1398
1399 cfg80211_init_wdev(wdev);
1400 break;
1401 case NETDEV_REGISTER:
1402 if (!wdev->registered) {
1403 wiphy_lock(&rdev->wiphy);
1404 cfg80211_register_wdev(rdev, wdev);
1405 wiphy_unlock(&rdev->wiphy);
1406 }
1407 break;
1408 case NETDEV_UNREGISTER:
1409 /*
1410 * It is possible to get NETDEV_UNREGISTER multiple times,
1411 * so check wdev->registered.
1412 */
1413 if (wdev->registered && !wdev->registering) {
1414 wiphy_lock(&rdev->wiphy);
1415 _cfg80211_unregister_wdev(wdev, false);
1416 wiphy_unlock(&rdev->wiphy);
1417 }
1418 break;
1419 case NETDEV_GOING_DOWN:
1420 wiphy_lock(&rdev->wiphy);
1421 cfg80211_leave(rdev, wdev);
1422 wiphy_unlock(&rdev->wiphy);
1423 break;
1424 case NETDEV_DOWN:
1425 wiphy_lock(&rdev->wiphy);
1426 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1427 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1428 if (WARN_ON(!rdev->scan_req->notified &&
1429 (!rdev->int_scan_req ||
1430 !rdev->int_scan_req->notified)))
1431 rdev->scan_req->info.aborted = true;
1432 ___cfg80211_scan_done(rdev, false);
1433 }
1434
1435 list_for_each_entry_safe(pos, tmp,
1436 &rdev->sched_scan_req_list, list) {
1437 if (WARN_ON(pos->dev == wdev->netdev))
1438 cfg80211_stop_sched_scan_req(rdev, pos, false);
1439 }
1440
1441 rdev->opencount--;
1442 wiphy_unlock(&rdev->wiphy);
1443 wake_up(&rdev->dev_wait);
1444 break;
1445 case NETDEV_UP:
1446 wiphy_lock(&rdev->wiphy);
1447 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1448 wdev_lock(wdev);
1449 switch (wdev->iftype) {
1450 #ifdef CONFIG_CFG80211_WEXT
1451 case NL80211_IFTYPE_ADHOC:
1452 cfg80211_ibss_wext_join(rdev, wdev);
1453 break;
1454 case NL80211_IFTYPE_STATION:
1455 cfg80211_mgd_wext_connect(rdev, wdev);
1456 break;
1457 #endif
1458 #ifdef CONFIG_MAC80211_MESH
1459 case NL80211_IFTYPE_MESH_POINT:
1460 {
1461 /* backward compat code... */
1462 struct mesh_setup setup;
1463 memcpy(&setup, &default_mesh_setup,
1464 sizeof(setup));
1465 /* back compat only needed for mesh_id */
1466 setup.mesh_id = wdev->ssid;
1467 setup.mesh_id_len = wdev->mesh_id_up_len;
1468 if (wdev->mesh_id_up_len)
1469 __cfg80211_join_mesh(rdev, dev,
1470 &setup,
1471 &default_mesh_config);
1472 break;
1473 }
1474 #endif
1475 default:
1476 break;
1477 }
1478 wdev_unlock(wdev);
1479 rdev->opencount++;
1480
1481 /*
1482 * Configure power management to the driver here so that its
1483 * correctly set also after interface type changes etc.
1484 */
1485 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1486 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1487 rdev->ops->set_power_mgmt &&
1488 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1489 wdev->ps_timeout)) {
1490 /* assume this means it's off */
1491 wdev->ps = false;
1492 }
1493 wiphy_unlock(&rdev->wiphy);
1494 break;
1495 case NETDEV_PRE_UP:
1496 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1497 wdev->use_4addr, 0))
1498 return notifier_from_errno(-EOPNOTSUPP);
1499
1500 if (rfkill_blocked(rdev->wiphy.rfkill))
1501 return notifier_from_errno(-ERFKILL);
1502 break;
1503 default:
1504 return NOTIFY_DONE;
1505 }
1506
1507 wireless_nlevent_flush();
1508
1509 return NOTIFY_OK;
1510 }
1511
1512 static struct notifier_block cfg80211_netdev_notifier = {
1513 .notifier_call = cfg80211_netdev_notifier_call,
1514 };
1515
cfg80211_pernet_exit(struct net * net)1516 static void __net_exit cfg80211_pernet_exit(struct net *net)
1517 {
1518 struct cfg80211_registered_device *rdev;
1519
1520 rtnl_lock();
1521 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1522 if (net_eq(wiphy_net(&rdev->wiphy), net))
1523 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1524 }
1525 rtnl_unlock();
1526 }
1527
1528 static struct pernet_operations cfg80211_pernet_ops = {
1529 .exit = cfg80211_pernet_exit,
1530 };
1531
cfg80211_init(void)1532 static int __init cfg80211_init(void)
1533 {
1534 int err;
1535
1536 err = register_pernet_device(&cfg80211_pernet_ops);
1537 if (err)
1538 goto out_fail_pernet;
1539
1540 err = wiphy_sysfs_init();
1541 if (err)
1542 goto out_fail_sysfs;
1543
1544 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1545 if (err)
1546 goto out_fail_notifier;
1547
1548 err = nl80211_init();
1549 if (err)
1550 goto out_fail_nl80211;
1551
1552 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1553
1554 err = regulatory_init();
1555 if (err)
1556 goto out_fail_reg;
1557
1558 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1559 if (!cfg80211_wq) {
1560 err = -ENOMEM;
1561 goto out_fail_wq;
1562 }
1563
1564 return 0;
1565
1566 out_fail_wq:
1567 regulatory_exit();
1568 out_fail_reg:
1569 debugfs_remove(ieee80211_debugfs_dir);
1570 nl80211_exit();
1571 out_fail_nl80211:
1572 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1573 out_fail_notifier:
1574 wiphy_sysfs_exit();
1575 out_fail_sysfs:
1576 unregister_pernet_device(&cfg80211_pernet_ops);
1577 out_fail_pernet:
1578 return err;
1579 }
1580 fs_initcall(cfg80211_init);
1581
cfg80211_exit(void)1582 static void __exit cfg80211_exit(void)
1583 {
1584 debugfs_remove(ieee80211_debugfs_dir);
1585 nl80211_exit();
1586 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1587 wiphy_sysfs_exit();
1588 regulatory_exit();
1589 unregister_pernet_device(&cfg80211_pernet_ops);
1590 destroy_workqueue(cfg80211_wq);
1591 }
1592 module_exit(cfg80211_exit);
1593