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 kfree(rdev);
1085 }
1086
wiphy_free(struct wiphy * wiphy)1087 void wiphy_free(struct wiphy *wiphy)
1088 {
1089 put_device(&wiphy->dev);
1090 }
1091 EXPORT_SYMBOL(wiphy_free);
1092
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1093 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1094 enum rfkill_hard_block_reasons reason)
1095 {
1096 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1097
1098 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1099 schedule_work(&rdev->rfkill_block);
1100 }
1101 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1102
cfg80211_cqm_config_free(struct wireless_dev * wdev)1103 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1104 {
1105 kfree(wdev->cqm_config);
1106 wdev->cqm_config = NULL;
1107 }
1108
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1109 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1110 bool unregister_netdev)
1111 {
1112 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1113
1114 ASSERT_RTNL();
1115 lockdep_assert_held(&rdev->wiphy.mtx);
1116
1117 flush_work(&wdev->pmsr_free_wk);
1118
1119 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1120
1121 wdev->registered = false;
1122
1123 if (wdev->netdev) {
1124 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1125 if (unregister_netdev)
1126 unregister_netdevice(wdev->netdev);
1127 }
1128
1129 list_del_rcu(&wdev->list);
1130 synchronize_net();
1131 rdev->devlist_generation++;
1132
1133 cfg80211_mlme_purge_registrations(wdev);
1134
1135 switch (wdev->iftype) {
1136 case NL80211_IFTYPE_P2P_DEVICE:
1137 cfg80211_stop_p2p_device(rdev, wdev);
1138 break;
1139 case NL80211_IFTYPE_NAN:
1140 cfg80211_stop_nan(rdev, wdev);
1141 break;
1142 default:
1143 break;
1144 }
1145
1146 #ifdef CONFIG_CFG80211_WEXT
1147 kfree_sensitive(wdev->wext.keys);
1148 wdev->wext.keys = NULL;
1149 #endif
1150 /* only initialized if we have a netdev */
1151 if (wdev->netdev)
1152 flush_work(&wdev->disconnect_wk);
1153
1154 cfg80211_cqm_config_free(wdev);
1155
1156 /*
1157 * Ensure that all events have been processed and
1158 * freed.
1159 */
1160 cfg80211_process_wdev_events(wdev);
1161
1162 if (WARN_ON(wdev->current_bss)) {
1163 cfg80211_unhold_bss(wdev->current_bss);
1164 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1165 wdev->current_bss = NULL;
1166 }
1167 }
1168
cfg80211_unregister_wdev(struct wireless_dev * wdev)1169 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1170 {
1171 _cfg80211_unregister_wdev(wdev, true);
1172 }
1173 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1174
1175 static const struct device_type wiphy_type = {
1176 .name = "wlan",
1177 };
1178
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1179 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1180 enum nl80211_iftype iftype, int num)
1181 {
1182 lockdep_assert_held(&rdev->wiphy.mtx);
1183
1184 rdev->num_running_ifaces += num;
1185 if (iftype == NL80211_IFTYPE_MONITOR)
1186 rdev->num_running_monitor_ifaces += num;
1187 }
1188
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1189 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1190 struct wireless_dev *wdev)
1191 {
1192 struct net_device *dev = wdev->netdev;
1193 struct cfg80211_sched_scan_request *pos, *tmp;
1194
1195 lockdep_assert_held(&rdev->wiphy.mtx);
1196 ASSERT_WDEV_LOCK(wdev);
1197
1198 cfg80211_pmsr_wdev_down(wdev);
1199
1200 switch (wdev->iftype) {
1201 case NL80211_IFTYPE_ADHOC:
1202 __cfg80211_leave_ibss(rdev, dev, true);
1203 break;
1204 case NL80211_IFTYPE_P2P_CLIENT:
1205 case NL80211_IFTYPE_STATION:
1206 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1207 list) {
1208 if (dev == pos->dev)
1209 cfg80211_stop_sched_scan_req(rdev, pos, false);
1210 }
1211
1212 #ifdef CONFIG_CFG80211_WEXT
1213 kfree(wdev->wext.ie);
1214 wdev->wext.ie = NULL;
1215 wdev->wext.ie_len = 0;
1216 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1217 #endif
1218 cfg80211_disconnect(rdev, dev,
1219 WLAN_REASON_DEAUTH_LEAVING, true);
1220 break;
1221 case NL80211_IFTYPE_MESH_POINT:
1222 __cfg80211_leave_mesh(rdev, dev);
1223 break;
1224 case NL80211_IFTYPE_AP:
1225 case NL80211_IFTYPE_P2P_GO:
1226 __cfg80211_stop_ap(rdev, dev, true);
1227 break;
1228 case NL80211_IFTYPE_OCB:
1229 __cfg80211_leave_ocb(rdev, dev);
1230 break;
1231 case NL80211_IFTYPE_P2P_DEVICE:
1232 case NL80211_IFTYPE_NAN:
1233 /* cannot happen, has no netdev */
1234 break;
1235 case NL80211_IFTYPE_AP_VLAN:
1236 case NL80211_IFTYPE_MONITOR:
1237 /* nothing to do */
1238 break;
1239 case NL80211_IFTYPE_UNSPECIFIED:
1240 case NL80211_IFTYPE_WDS:
1241 case NUM_NL80211_IFTYPES:
1242 /* invalid */
1243 break;
1244 }
1245 }
1246
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1247 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1248 struct wireless_dev *wdev)
1249 {
1250 wdev_lock(wdev);
1251 __cfg80211_leave(rdev, wdev);
1252 wdev_unlock(wdev);
1253 }
1254
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1255 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1256 gfp_t gfp)
1257 {
1258 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1259 struct cfg80211_event *ev;
1260 unsigned long flags;
1261
1262 trace_cfg80211_stop_iface(wiphy, wdev);
1263
1264 ev = kzalloc(sizeof(*ev), gfp);
1265 if (!ev)
1266 return;
1267
1268 ev->type = EVENT_STOPPED;
1269
1270 spin_lock_irqsave(&wdev->event_lock, flags);
1271 list_add_tail(&ev->list, &wdev->event_list);
1272 spin_unlock_irqrestore(&wdev->event_lock, flags);
1273 queue_work(cfg80211_wq, &rdev->event_work);
1274 }
1275 EXPORT_SYMBOL(cfg80211_stop_iface);
1276
cfg80211_init_wdev(struct wireless_dev * wdev)1277 void cfg80211_init_wdev(struct wireless_dev *wdev)
1278 {
1279 mutex_init(&wdev->mtx);
1280 INIT_LIST_HEAD(&wdev->event_list);
1281 spin_lock_init(&wdev->event_lock);
1282 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1283 INIT_LIST_HEAD(&wdev->pmsr_list);
1284 spin_lock_init(&wdev->pmsr_lock);
1285 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1286
1287 #ifdef CONFIG_CFG80211_WEXT
1288 wdev->wext.default_key = -1;
1289 wdev->wext.default_mgmt_key = -1;
1290 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1291 #endif
1292
1293 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1294 wdev->ps = true;
1295 else
1296 wdev->ps = false;
1297 /* allow mac80211 to determine the timeout */
1298 wdev->ps_timeout = -1;
1299
1300 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1301 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1302 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1303 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1304
1305 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1306 }
1307
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1308 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1309 struct wireless_dev *wdev)
1310 {
1311 ASSERT_RTNL();
1312 lockdep_assert_held(&rdev->wiphy.mtx);
1313
1314 /*
1315 * We get here also when the interface changes network namespaces,
1316 * as it's registered into the new one, but we don't want it to
1317 * change ID in that case. Checking if the ID is already assigned
1318 * works, because 0 isn't considered a valid ID and the memory is
1319 * 0-initialized.
1320 */
1321 if (!wdev->identifier)
1322 wdev->identifier = ++rdev->wdev_id;
1323 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1324 rdev->devlist_generation++;
1325 wdev->registered = true;
1326
1327 if (wdev->netdev &&
1328 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1329 "phy80211"))
1330 pr_err("failed to add phy80211 symlink to netdev!\n");
1331
1332 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1333 }
1334
cfg80211_register_netdevice(struct net_device * dev)1335 int cfg80211_register_netdevice(struct net_device *dev)
1336 {
1337 struct wireless_dev *wdev = dev->ieee80211_ptr;
1338 struct cfg80211_registered_device *rdev;
1339 int ret;
1340
1341 ASSERT_RTNL();
1342
1343 if (WARN_ON(!wdev))
1344 return -EINVAL;
1345
1346 rdev = wiphy_to_rdev(wdev->wiphy);
1347
1348 lockdep_assert_held(&rdev->wiphy.mtx);
1349
1350 /* we'll take care of this */
1351 wdev->registered = true;
1352 wdev->registering = true;
1353 ret = register_netdevice(dev);
1354 if (ret)
1355 goto out;
1356
1357 cfg80211_register_wdev(rdev, wdev);
1358 ret = 0;
1359 out:
1360 wdev->registering = false;
1361 if (ret)
1362 wdev->registered = false;
1363 return ret;
1364 }
1365 EXPORT_SYMBOL(cfg80211_register_netdevice);
1366
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1367 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1368 unsigned long state, void *ptr)
1369 {
1370 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1371 struct wireless_dev *wdev = dev->ieee80211_ptr;
1372 struct cfg80211_registered_device *rdev;
1373 struct cfg80211_sched_scan_request *pos, *tmp;
1374
1375 if (!wdev)
1376 return NOTIFY_DONE;
1377
1378 rdev = wiphy_to_rdev(wdev->wiphy);
1379
1380 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1381
1382 switch (state) {
1383 case NETDEV_POST_INIT:
1384 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1385 wdev->netdev = dev;
1386 /* can only change netns with wiphy */
1387 dev->features |= NETIF_F_NETNS_LOCAL;
1388
1389 cfg80211_init_wdev(wdev);
1390 break;
1391 case NETDEV_REGISTER:
1392 if (!wdev->registered) {
1393 wiphy_lock(&rdev->wiphy);
1394 cfg80211_register_wdev(rdev, wdev);
1395 wiphy_unlock(&rdev->wiphy);
1396 }
1397 break;
1398 case NETDEV_UNREGISTER:
1399 /*
1400 * It is possible to get NETDEV_UNREGISTER multiple times,
1401 * so check wdev->registered.
1402 */
1403 if (wdev->registered && !wdev->registering) {
1404 wiphy_lock(&rdev->wiphy);
1405 _cfg80211_unregister_wdev(wdev, false);
1406 wiphy_unlock(&rdev->wiphy);
1407 }
1408 break;
1409 case NETDEV_GOING_DOWN:
1410 wiphy_lock(&rdev->wiphy);
1411 cfg80211_leave(rdev, wdev);
1412 wiphy_unlock(&rdev->wiphy);
1413 break;
1414 case NETDEV_DOWN:
1415 wiphy_lock(&rdev->wiphy);
1416 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1417 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1418 if (WARN_ON(!rdev->scan_req->notified &&
1419 (!rdev->int_scan_req ||
1420 !rdev->int_scan_req->notified)))
1421 rdev->scan_req->info.aborted = true;
1422 ___cfg80211_scan_done(rdev, false);
1423 }
1424
1425 list_for_each_entry_safe(pos, tmp,
1426 &rdev->sched_scan_req_list, list) {
1427 if (WARN_ON(pos->dev == wdev->netdev))
1428 cfg80211_stop_sched_scan_req(rdev, pos, false);
1429 }
1430
1431 rdev->opencount--;
1432 wiphy_unlock(&rdev->wiphy);
1433 wake_up(&rdev->dev_wait);
1434 break;
1435 case NETDEV_UP:
1436 wiphy_lock(&rdev->wiphy);
1437 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1438 wdev_lock(wdev);
1439 switch (wdev->iftype) {
1440 #ifdef CONFIG_CFG80211_WEXT
1441 case NL80211_IFTYPE_ADHOC:
1442 cfg80211_ibss_wext_join(rdev, wdev);
1443 break;
1444 case NL80211_IFTYPE_STATION:
1445 cfg80211_mgd_wext_connect(rdev, wdev);
1446 break;
1447 #endif
1448 #ifdef CONFIG_MAC80211_MESH
1449 case NL80211_IFTYPE_MESH_POINT:
1450 {
1451 /* backward compat code... */
1452 struct mesh_setup setup;
1453 memcpy(&setup, &default_mesh_setup,
1454 sizeof(setup));
1455 /* back compat only needed for mesh_id */
1456 setup.mesh_id = wdev->ssid;
1457 setup.mesh_id_len = wdev->mesh_id_up_len;
1458 if (wdev->mesh_id_up_len)
1459 __cfg80211_join_mesh(rdev, dev,
1460 &setup,
1461 &default_mesh_config);
1462 break;
1463 }
1464 #endif
1465 default:
1466 break;
1467 }
1468 wdev_unlock(wdev);
1469 rdev->opencount++;
1470
1471 /*
1472 * Configure power management to the driver here so that its
1473 * correctly set also after interface type changes etc.
1474 */
1475 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1476 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1477 rdev->ops->set_power_mgmt &&
1478 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1479 wdev->ps_timeout)) {
1480 /* assume this means it's off */
1481 wdev->ps = false;
1482 }
1483 wiphy_unlock(&rdev->wiphy);
1484 break;
1485 case NETDEV_PRE_UP:
1486 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1487 wdev->use_4addr, 0))
1488 return notifier_from_errno(-EOPNOTSUPP);
1489
1490 if (rfkill_blocked(rdev->wiphy.rfkill))
1491 return notifier_from_errno(-ERFKILL);
1492 break;
1493 default:
1494 return NOTIFY_DONE;
1495 }
1496
1497 wireless_nlevent_flush();
1498
1499 return NOTIFY_OK;
1500 }
1501
1502 static struct notifier_block cfg80211_netdev_notifier = {
1503 .notifier_call = cfg80211_netdev_notifier_call,
1504 };
1505
cfg80211_pernet_exit(struct net * net)1506 static void __net_exit cfg80211_pernet_exit(struct net *net)
1507 {
1508 struct cfg80211_registered_device *rdev;
1509
1510 rtnl_lock();
1511 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1512 if (net_eq(wiphy_net(&rdev->wiphy), net))
1513 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1514 }
1515 rtnl_unlock();
1516 }
1517
1518 static struct pernet_operations cfg80211_pernet_ops = {
1519 .exit = cfg80211_pernet_exit,
1520 };
1521
cfg80211_init(void)1522 static int __init cfg80211_init(void)
1523 {
1524 int err;
1525
1526 err = register_pernet_device(&cfg80211_pernet_ops);
1527 if (err)
1528 goto out_fail_pernet;
1529
1530 err = wiphy_sysfs_init();
1531 if (err)
1532 goto out_fail_sysfs;
1533
1534 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1535 if (err)
1536 goto out_fail_notifier;
1537
1538 err = nl80211_init();
1539 if (err)
1540 goto out_fail_nl80211;
1541
1542 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1543
1544 err = regulatory_init();
1545 if (err)
1546 goto out_fail_reg;
1547
1548 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1549 if (!cfg80211_wq) {
1550 err = -ENOMEM;
1551 goto out_fail_wq;
1552 }
1553
1554 return 0;
1555
1556 out_fail_wq:
1557 regulatory_exit();
1558 out_fail_reg:
1559 debugfs_remove(ieee80211_debugfs_dir);
1560 nl80211_exit();
1561 out_fail_nl80211:
1562 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1563 out_fail_notifier:
1564 wiphy_sysfs_exit();
1565 out_fail_sysfs:
1566 unregister_pernet_device(&cfg80211_pernet_ops);
1567 out_fail_pernet:
1568 return err;
1569 }
1570 fs_initcall(cfg80211_init);
1571
cfg80211_exit(void)1572 static void __exit cfg80211_exit(void)
1573 {
1574 debugfs_remove(ieee80211_debugfs_dir);
1575 nl80211_exit();
1576 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1577 wiphy_sysfs_exit();
1578 regulatory_exit();
1579 unregister_pernet_device(&cfg80211_pernet_ops);
1580 destroy_workqueue(cfg80211_wq);
1581 }
1582 module_exit(cfg80211_exit);
1583
