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