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 			cfg80211_remove_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 			bool has_ap, has_non_ap;
864 			u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
865 				      BIT(NL80211_IFTYPE_P2P_GO);
866 
867 			iftd = &sband->iftype_data[i];
868 
869 			if (WARN_ON(!iftd->types_mask))
870 				return -EINVAL;
871 			if (WARN_ON(types & iftd->types_mask))
872 				return -EINVAL;
873 
874 			/* at least one piece of information must be present */
875 			if (WARN_ON(!iftd->he_cap.has_he))
876 				return -EINVAL;
877 
878 			types |= iftd->types_mask;
879 
880 			if (i == 0)
881 				have_he = iftd->he_cap.has_he;
882 			else
883 				have_he = have_he &&
884 					  iftd->he_cap.has_he;
885 
886 			has_ap = iftd->types_mask & ap_bits;
887 			has_non_ap = iftd->types_mask & ~ap_bits;
888 
889 			/*
890 			 * For EHT 20 MHz STA, the capabilities format differs
891 			 * but to simplify, don't check 20 MHz but rather check
892 			 * only if AP and non-AP were mentioned at the same time,
893 			 * reject if so.
894 			 */
895 			if (WARN_ON(iftd->eht_cap.has_eht &&
896 				    has_ap && has_non_ap))
897 				return -EINVAL;
898 		}
899 
900 		if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
901 			return -EINVAL;
902 
903 		have_band = true;
904 	}
905 
906 	if (!have_band) {
907 		WARN_ON(1);
908 		return -EINVAL;
909 	}
910 
911 	for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
912 		/*
913 		 * Validate we have a policy (can be explicitly set to
914 		 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
915 		 * we have at least one of doit/dumpit.
916 		 */
917 		if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
918 			return -EINVAL;
919 		if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
920 			    !rdev->wiphy.vendor_commands[i].dumpit))
921 			return -EINVAL;
922 	}
923 
924 #ifdef CONFIG_PM
925 	if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
926 		    (!rdev->wiphy.wowlan->pattern_min_len ||
927 		     rdev->wiphy.wowlan->pattern_min_len >
928 				rdev->wiphy.wowlan->pattern_max_len)))
929 		return -EINVAL;
930 #endif
931 
932 	if (!wiphy->max_num_akm_suites)
933 		wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
934 	else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
935 		 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
936 		return -EINVAL;
937 
938 	/* check and set up bitrates */
939 	ieee80211_set_bitrate_flags(wiphy);
940 
941 	rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
942 
943 	rtnl_lock();
944 	res = device_add(&rdev->wiphy.dev);
945 	if (res) {
946 		rtnl_unlock();
947 		return res;
948 	}
949 
950 	list_add_rcu(&rdev->list, &cfg80211_rdev_list);
951 	cfg80211_rdev_list_generation++;
952 
953 	/* add to debugfs */
954 	rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
955 						    ieee80211_debugfs_dir);
956 
957 	cfg80211_debugfs_rdev_add(rdev);
958 	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
959 
960 	/* set up regulatory info */
961 	wiphy_regulatory_register(wiphy);
962 
963 	if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
964 		struct regulatory_request request;
965 
966 		request.wiphy_idx = get_wiphy_idx(wiphy);
967 		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
968 		request.alpha2[0] = '9';
969 		request.alpha2[1] = '9';
970 
971 		nl80211_send_reg_change_event(&request);
972 	}
973 
974 	/* Check that nobody globally advertises any capabilities they do not
975 	 * advertise on all possible interface types.
976 	 */
977 	if (wiphy->extended_capabilities_len &&
978 	    wiphy->num_iftype_ext_capab &&
979 	    wiphy->iftype_ext_capab) {
980 		u8 supported_on_all, j;
981 		const struct wiphy_iftype_ext_capab *capab;
982 
983 		capab = wiphy->iftype_ext_capab;
984 		for (j = 0; j < wiphy->extended_capabilities_len; j++) {
985 			if (capab[0].extended_capabilities_len > j)
986 				supported_on_all =
987 					capab[0].extended_capabilities[j];
988 			else
989 				supported_on_all = 0x00;
990 			for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
991 				if (j >= capab[i].extended_capabilities_len) {
992 					supported_on_all = 0x00;
993 					break;
994 				}
995 				supported_on_all &=
996 					capab[i].extended_capabilities[j];
997 			}
998 			if (WARN_ON(wiphy->extended_capabilities[j] &
999 				    ~supported_on_all))
1000 				break;
1001 		}
1002 	}
1003 
1004 	rdev->wiphy.registered = true;
1005 	rtnl_unlock();
1006 
1007 	res = rfkill_register(rdev->wiphy.rfkill);
1008 	if (res) {
1009 		rfkill_destroy(rdev->wiphy.rfkill);
1010 		rdev->wiphy.rfkill = NULL;
1011 		wiphy_unregister(&rdev->wiphy);
1012 		return res;
1013 	}
1014 
1015 	return 0;
1016 }
1017 EXPORT_SYMBOL(wiphy_register);
1018 
wiphy_rfkill_start_polling(struct wiphy * wiphy)1019 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1020 {
1021 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1022 
1023 	if (!rdev->ops->rfkill_poll)
1024 		return;
1025 	rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1026 	rfkill_resume_polling(wiphy->rfkill);
1027 }
1028 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1029 
wiphy_unregister(struct wiphy * wiphy)1030 void wiphy_unregister(struct wiphy *wiphy)
1031 {
1032 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1033 
1034 	wait_event(rdev->dev_wait, ({
1035 		int __count;
1036 		wiphy_lock(&rdev->wiphy);
1037 		__count = rdev->opencount;
1038 		wiphy_unlock(&rdev->wiphy);
1039 		__count == 0; }));
1040 
1041 	if (rdev->wiphy.rfkill)
1042 		rfkill_unregister(rdev->wiphy.rfkill);
1043 
1044 	rtnl_lock();
1045 	wiphy_lock(&rdev->wiphy);
1046 	nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1047 	rdev->wiphy.registered = false;
1048 
1049 	WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1050 
1051 	/*
1052 	 * First remove the hardware from everywhere, this makes
1053 	 * it impossible to find from userspace.
1054 	 */
1055 	debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1056 	list_del_rcu(&rdev->list);
1057 	synchronize_rcu();
1058 
1059 	/*
1060 	 * If this device got a regulatory hint tell core its
1061 	 * free to listen now to a new shiny device regulatory hint
1062 	 */
1063 	wiphy_regulatory_deregister(wiphy);
1064 
1065 	cfg80211_rdev_list_generation++;
1066 	device_del(&rdev->wiphy.dev);
1067 
1068 	wiphy_unlock(&rdev->wiphy);
1069 	rtnl_unlock();
1070 
1071 	flush_work(&rdev->scan_done_wk);
1072 	cancel_work_sync(&rdev->conn_work);
1073 	flush_work(&rdev->event_work);
1074 	cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1075 	cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1076 	flush_work(&rdev->destroy_work);
1077 	flush_work(&rdev->sched_scan_stop_wk);
1078 	flush_work(&rdev->propagate_radar_detect_wk);
1079 	flush_work(&rdev->propagate_cac_done_wk);
1080 	flush_work(&rdev->mgmt_registrations_update_wk);
1081 	flush_work(&rdev->background_cac_abort_wk);
1082 
1083 #ifdef CONFIG_PM
1084 	if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1085 		rdev_set_wakeup(rdev, false);
1086 #endif
1087 	cfg80211_rdev_free_wowlan(rdev);
1088 	cfg80211_rdev_free_coalesce(rdev);
1089 }
1090 EXPORT_SYMBOL(wiphy_unregister);
1091 
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1092 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1093 {
1094 	struct cfg80211_internal_bss *scan, *tmp;
1095 	struct cfg80211_beacon_registration *reg, *treg;
1096 	rfkill_destroy(rdev->wiphy.rfkill);
1097 	list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1098 		list_del(&reg->list);
1099 		kfree(reg);
1100 	}
1101 	list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1102 		cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1103 	mutex_destroy(&rdev->wiphy.mtx);
1104 
1105 	/*
1106 	 * The 'regd' can only be non-NULL if we never finished
1107 	 * initializing the wiphy and thus never went through the
1108 	 * unregister path - e.g. in failure scenarios. Thus, it
1109 	 * cannot have been visible to anyone if non-NULL, so we
1110 	 * can just free it here.
1111 	 */
1112 	kfree(rcu_dereference_raw(rdev->wiphy.regd));
1113 
1114 	kfree(rdev);
1115 }
1116 
wiphy_free(struct wiphy * wiphy)1117 void wiphy_free(struct wiphy *wiphy)
1118 {
1119 	put_device(&wiphy->dev);
1120 }
1121 EXPORT_SYMBOL(wiphy_free);
1122 
wiphy_rfkill_set_hw_state_reason(struct wiphy * wiphy,bool blocked,enum rfkill_hard_block_reasons reason)1123 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1124 				      enum rfkill_hard_block_reasons reason)
1125 {
1126 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1127 
1128 	if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1129 		schedule_work(&rdev->rfkill_block);
1130 }
1131 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1132 
cfg80211_cqm_config_free(struct wireless_dev * wdev)1133 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1134 {
1135 	kfree(wdev->cqm_config);
1136 	wdev->cqm_config = NULL;
1137 }
1138 
_cfg80211_unregister_wdev(struct wireless_dev * wdev,bool unregister_netdev)1139 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1140 				      bool unregister_netdev)
1141 {
1142 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1143 	unsigned int link_id;
1144 
1145 	ASSERT_RTNL();
1146 	lockdep_assert_held(&rdev->wiphy.mtx);
1147 
1148 	flush_work(&wdev->pmsr_free_wk);
1149 
1150 	nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1151 
1152 	wdev->registered = false;
1153 
1154 	if (wdev->netdev) {
1155 		sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1156 		if (unregister_netdev)
1157 			unregister_netdevice(wdev->netdev);
1158 	}
1159 
1160 	list_del_rcu(&wdev->list);
1161 	synchronize_net();
1162 	rdev->devlist_generation++;
1163 
1164 	cfg80211_mlme_purge_registrations(wdev);
1165 
1166 	switch (wdev->iftype) {
1167 	case NL80211_IFTYPE_P2P_DEVICE:
1168 		cfg80211_stop_p2p_device(rdev, wdev);
1169 		break;
1170 	case NL80211_IFTYPE_NAN:
1171 		cfg80211_stop_nan(rdev, wdev);
1172 		break;
1173 	default:
1174 		break;
1175 	}
1176 
1177 #ifdef CONFIG_CFG80211_WEXT
1178 	kfree_sensitive(wdev->wext.keys);
1179 	wdev->wext.keys = NULL;
1180 #endif
1181 	/* only initialized if we have a netdev */
1182 	if (wdev->netdev)
1183 		flush_work(&wdev->disconnect_wk);
1184 
1185 	cfg80211_cqm_config_free(wdev);
1186 
1187 	/*
1188 	 * Ensure that all events have been processed and
1189 	 * freed.
1190 	 */
1191 	cfg80211_process_wdev_events(wdev);
1192 
1193 	if (wdev->iftype == NL80211_IFTYPE_STATION ||
1194 	    wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1195 		for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1196 			struct cfg80211_internal_bss *curbss;
1197 
1198 			curbss = wdev->links[link_id].client.current_bss;
1199 
1200 			if (WARN_ON(curbss)) {
1201 				cfg80211_unhold_bss(curbss);
1202 				cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1203 				wdev->links[link_id].client.current_bss = NULL;
1204 			}
1205 		}
1206 	}
1207 
1208 	wdev->connected = false;
1209 }
1210 
cfg80211_unregister_wdev(struct wireless_dev * wdev)1211 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1212 {
1213 	_cfg80211_unregister_wdev(wdev, true);
1214 }
1215 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1216 
1217 static const struct device_type wiphy_type = {
1218 	.name	= "wlan",
1219 };
1220 
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1221 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1222 			       enum nl80211_iftype iftype, int num)
1223 {
1224 	lockdep_assert_held(&rdev->wiphy.mtx);
1225 
1226 	rdev->num_running_ifaces += num;
1227 	if (iftype == NL80211_IFTYPE_MONITOR)
1228 		rdev->num_running_monitor_ifaces += num;
1229 }
1230 
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1231 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1232 		      struct wireless_dev *wdev)
1233 {
1234 	struct net_device *dev = wdev->netdev;
1235 	struct cfg80211_sched_scan_request *pos, *tmp;
1236 
1237 	lockdep_assert_held(&rdev->wiphy.mtx);
1238 	ASSERT_WDEV_LOCK(wdev);
1239 
1240 	cfg80211_pmsr_wdev_down(wdev);
1241 
1242 	cfg80211_stop_background_radar_detection(wdev);
1243 
1244 	switch (wdev->iftype) {
1245 	case NL80211_IFTYPE_ADHOC:
1246 		__cfg80211_leave_ibss(rdev, dev, true);
1247 		break;
1248 	case NL80211_IFTYPE_P2P_CLIENT:
1249 	case NL80211_IFTYPE_STATION:
1250 		list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1251 					 list) {
1252 			if (dev == pos->dev)
1253 				cfg80211_stop_sched_scan_req(rdev, pos, false);
1254 		}
1255 
1256 #ifdef CONFIG_CFG80211_WEXT
1257 		kfree(wdev->wext.ie);
1258 		wdev->wext.ie = NULL;
1259 		wdev->wext.ie_len = 0;
1260 		wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1261 #endif
1262 		cfg80211_disconnect(rdev, dev,
1263 				    WLAN_REASON_DEAUTH_LEAVING, true);
1264 		break;
1265 	case NL80211_IFTYPE_MESH_POINT:
1266 		__cfg80211_leave_mesh(rdev, dev);
1267 		break;
1268 	case NL80211_IFTYPE_AP:
1269 	case NL80211_IFTYPE_P2P_GO:
1270 		__cfg80211_stop_ap(rdev, dev, -1, true);
1271 		break;
1272 	case NL80211_IFTYPE_OCB:
1273 		__cfg80211_leave_ocb(rdev, dev);
1274 		break;
1275 	case NL80211_IFTYPE_P2P_DEVICE:
1276 	case NL80211_IFTYPE_NAN:
1277 		/* cannot happen, has no netdev */
1278 		break;
1279 	case NL80211_IFTYPE_AP_VLAN:
1280 	case NL80211_IFTYPE_MONITOR:
1281 		/* nothing to do */
1282 		break;
1283 	case NL80211_IFTYPE_UNSPECIFIED:
1284 	case NL80211_IFTYPE_WDS:
1285 	case NUM_NL80211_IFTYPES:
1286 		/* invalid */
1287 		break;
1288 	}
1289 }
1290 
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1291 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1292 		    struct wireless_dev *wdev)
1293 {
1294 	wdev_lock(wdev);
1295 	__cfg80211_leave(rdev, wdev);
1296 	wdev_unlock(wdev);
1297 }
1298 
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1299 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1300 			 gfp_t gfp)
1301 {
1302 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1303 	struct cfg80211_event *ev;
1304 	unsigned long flags;
1305 
1306 	trace_cfg80211_stop_iface(wiphy, wdev);
1307 
1308 	ev = kzalloc(sizeof(*ev), gfp);
1309 	if (!ev)
1310 		return;
1311 
1312 	ev->type = EVENT_STOPPED;
1313 
1314 	spin_lock_irqsave(&wdev->event_lock, flags);
1315 	list_add_tail(&ev->list, &wdev->event_list);
1316 	spin_unlock_irqrestore(&wdev->event_lock, flags);
1317 	queue_work(cfg80211_wq, &rdev->event_work);
1318 }
1319 EXPORT_SYMBOL(cfg80211_stop_iface);
1320 
cfg80211_init_wdev(struct wireless_dev * wdev)1321 void cfg80211_init_wdev(struct wireless_dev *wdev)
1322 {
1323 	mutex_init(&wdev->mtx);
1324 	INIT_LIST_HEAD(&wdev->event_list);
1325 	spin_lock_init(&wdev->event_lock);
1326 	INIT_LIST_HEAD(&wdev->mgmt_registrations);
1327 	INIT_LIST_HEAD(&wdev->pmsr_list);
1328 	spin_lock_init(&wdev->pmsr_lock);
1329 	INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1330 
1331 #ifdef CONFIG_CFG80211_WEXT
1332 	wdev->wext.default_key = -1;
1333 	wdev->wext.default_mgmt_key = -1;
1334 	wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1335 #endif
1336 
1337 	if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1338 		wdev->ps = true;
1339 	else
1340 		wdev->ps = false;
1341 	/* allow mac80211 to determine the timeout */
1342 	wdev->ps_timeout = -1;
1343 
1344 	if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1345 	     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1346 	     wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1347 		wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1348 
1349 	INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1350 }
1351 
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1352 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1353 			    struct wireless_dev *wdev)
1354 {
1355 	ASSERT_RTNL();
1356 	lockdep_assert_held(&rdev->wiphy.mtx);
1357 
1358 	/*
1359 	 * We get here also when the interface changes network namespaces,
1360 	 * as it's registered into the new one, but we don't want it to
1361 	 * change ID in that case. Checking if the ID is already assigned
1362 	 * works, because 0 isn't considered a valid ID and the memory is
1363 	 * 0-initialized.
1364 	 */
1365 	if (!wdev->identifier)
1366 		wdev->identifier = ++rdev->wdev_id;
1367 	list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1368 	rdev->devlist_generation++;
1369 	wdev->registered = true;
1370 
1371 	if (wdev->netdev &&
1372 	    sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1373 			      "phy80211"))
1374 		pr_err("failed to add phy80211 symlink to netdev!\n");
1375 
1376 	nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1377 }
1378 
cfg80211_register_netdevice(struct net_device * dev)1379 int cfg80211_register_netdevice(struct net_device *dev)
1380 {
1381 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1382 	struct cfg80211_registered_device *rdev;
1383 	int ret;
1384 
1385 	ASSERT_RTNL();
1386 
1387 	if (WARN_ON(!wdev))
1388 		return -EINVAL;
1389 
1390 	rdev = wiphy_to_rdev(wdev->wiphy);
1391 
1392 	lockdep_assert_held(&rdev->wiphy.mtx);
1393 
1394 	/* we'll take care of this */
1395 	wdev->registered = true;
1396 	wdev->registering = true;
1397 	ret = register_netdevice(dev);
1398 	if (ret)
1399 		goto out;
1400 
1401 	cfg80211_register_wdev(rdev, wdev);
1402 	ret = 0;
1403 out:
1404 	wdev->registering = false;
1405 	if (ret)
1406 		wdev->registered = false;
1407 	return ret;
1408 }
1409 EXPORT_SYMBOL(cfg80211_register_netdevice);
1410 
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1411 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1412 					 unsigned long state, void *ptr)
1413 {
1414 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1415 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1416 	struct cfg80211_registered_device *rdev;
1417 	struct cfg80211_sched_scan_request *pos, *tmp;
1418 
1419 	if (!wdev)
1420 		return NOTIFY_DONE;
1421 
1422 	rdev = wiphy_to_rdev(wdev->wiphy);
1423 
1424 	WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1425 
1426 	switch (state) {
1427 	case NETDEV_POST_INIT:
1428 		SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1429 		wdev->netdev = dev;
1430 		/* can only change netns with wiphy */
1431 		dev->features |= NETIF_F_NETNS_LOCAL;
1432 
1433 		cfg80211_init_wdev(wdev);
1434 		break;
1435 	case NETDEV_REGISTER:
1436 		if (!wdev->registered) {
1437 			wiphy_lock(&rdev->wiphy);
1438 			cfg80211_register_wdev(rdev, wdev);
1439 			wiphy_unlock(&rdev->wiphy);
1440 		}
1441 		break;
1442 	case NETDEV_UNREGISTER:
1443 		/*
1444 		 * It is possible to get NETDEV_UNREGISTER multiple times,
1445 		 * so check wdev->registered.
1446 		 */
1447 		if (wdev->registered && !wdev->registering) {
1448 			wiphy_lock(&rdev->wiphy);
1449 			_cfg80211_unregister_wdev(wdev, false);
1450 			wiphy_unlock(&rdev->wiphy);
1451 		}
1452 		break;
1453 	case NETDEV_GOING_DOWN:
1454 		wiphy_lock(&rdev->wiphy);
1455 		cfg80211_leave(rdev, wdev);
1456 		cfg80211_remove_links(wdev);
1457 		wiphy_unlock(&rdev->wiphy);
1458 		break;
1459 	case NETDEV_DOWN:
1460 		wiphy_lock(&rdev->wiphy);
1461 		cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1462 		if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1463 			if (WARN_ON(!rdev->scan_req->notified &&
1464 				    (!rdev->int_scan_req ||
1465 				     !rdev->int_scan_req->notified)))
1466 				rdev->scan_req->info.aborted = true;
1467 			___cfg80211_scan_done(rdev, false);
1468 		}
1469 
1470 		list_for_each_entry_safe(pos, tmp,
1471 					 &rdev->sched_scan_req_list, list) {
1472 			if (WARN_ON(pos->dev == wdev->netdev))
1473 				cfg80211_stop_sched_scan_req(rdev, pos, false);
1474 		}
1475 
1476 		rdev->opencount--;
1477 		wiphy_unlock(&rdev->wiphy);
1478 		wake_up(&rdev->dev_wait);
1479 		break;
1480 	case NETDEV_UP:
1481 		wiphy_lock(&rdev->wiphy);
1482 		cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1483 		wdev_lock(wdev);
1484 		switch (wdev->iftype) {
1485 #ifdef CONFIG_CFG80211_WEXT
1486 		case NL80211_IFTYPE_ADHOC:
1487 			cfg80211_ibss_wext_join(rdev, wdev);
1488 			break;
1489 		case NL80211_IFTYPE_STATION:
1490 			cfg80211_mgd_wext_connect(rdev, wdev);
1491 			break;
1492 #endif
1493 #ifdef CONFIG_MAC80211_MESH
1494 		case NL80211_IFTYPE_MESH_POINT:
1495 			{
1496 				/* backward compat code... */
1497 				struct mesh_setup setup;
1498 				memcpy(&setup, &default_mesh_setup,
1499 						sizeof(setup));
1500 				 /* back compat only needed for mesh_id */
1501 				setup.mesh_id = wdev->u.mesh.id;
1502 				setup.mesh_id_len = wdev->u.mesh.id_up_len;
1503 				if (wdev->u.mesh.id_up_len)
1504 					__cfg80211_join_mesh(rdev, dev,
1505 							&setup,
1506 							&default_mesh_config);
1507 				break;
1508 			}
1509 #endif
1510 		default:
1511 			break;
1512 		}
1513 		wdev_unlock(wdev);
1514 		rdev->opencount++;
1515 
1516 		/*
1517 		 * Configure power management to the driver here so that its
1518 		 * correctly set also after interface type changes etc.
1519 		 */
1520 		if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1521 		     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1522 		    rdev->ops->set_power_mgmt &&
1523 		    rdev_set_power_mgmt(rdev, dev, wdev->ps,
1524 					wdev->ps_timeout)) {
1525 			/* assume this means it's off */
1526 			wdev->ps = false;
1527 		}
1528 		wiphy_unlock(&rdev->wiphy);
1529 		break;
1530 	case NETDEV_PRE_UP:
1531 		if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1532 					     wdev->use_4addr, 0))
1533 			return notifier_from_errno(-EOPNOTSUPP);
1534 
1535 		if (rfkill_blocked(rdev->wiphy.rfkill))
1536 			return notifier_from_errno(-ERFKILL);
1537 		break;
1538 	default:
1539 		return NOTIFY_DONE;
1540 	}
1541 
1542 	wireless_nlevent_flush();
1543 
1544 	return NOTIFY_OK;
1545 }
1546 
1547 static struct notifier_block cfg80211_netdev_notifier = {
1548 	.notifier_call = cfg80211_netdev_notifier_call,
1549 };
1550 
cfg80211_pernet_exit(struct net * net)1551 static void __net_exit cfg80211_pernet_exit(struct net *net)
1552 {
1553 	struct cfg80211_registered_device *rdev;
1554 
1555 	rtnl_lock();
1556 	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1557 		if (net_eq(wiphy_net(&rdev->wiphy), net))
1558 			WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1559 	}
1560 	rtnl_unlock();
1561 }
1562 
1563 static struct pernet_operations cfg80211_pernet_ops = {
1564 	.exit = cfg80211_pernet_exit,
1565 };
1566 
cfg80211_init(void)1567 static int __init cfg80211_init(void)
1568 {
1569 	int err;
1570 
1571 	err = register_pernet_device(&cfg80211_pernet_ops);
1572 	if (err)
1573 		goto out_fail_pernet;
1574 
1575 	err = wiphy_sysfs_init();
1576 	if (err)
1577 		goto out_fail_sysfs;
1578 
1579 	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1580 	if (err)
1581 		goto out_fail_notifier;
1582 
1583 	err = nl80211_init();
1584 	if (err)
1585 		goto out_fail_nl80211;
1586 
1587 	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1588 
1589 	err = regulatory_init();
1590 	if (err)
1591 		goto out_fail_reg;
1592 
1593 	cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1594 	if (!cfg80211_wq) {
1595 		err = -ENOMEM;
1596 		goto out_fail_wq;
1597 	}
1598 
1599 	return 0;
1600 
1601 out_fail_wq:
1602 	regulatory_exit();
1603 out_fail_reg:
1604 	debugfs_remove(ieee80211_debugfs_dir);
1605 	nl80211_exit();
1606 out_fail_nl80211:
1607 	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1608 out_fail_notifier:
1609 	wiphy_sysfs_exit();
1610 out_fail_sysfs:
1611 	unregister_pernet_device(&cfg80211_pernet_ops);
1612 out_fail_pernet:
1613 	return err;
1614 }
1615 fs_initcall(cfg80211_init);
1616 
cfg80211_exit(void)1617 static void __exit cfg80211_exit(void)
1618 {
1619 	debugfs_remove(ieee80211_debugfs_dir);
1620 	nl80211_exit();
1621 	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1622 	wiphy_sysfs_exit();
1623 	regulatory_exit();
1624 	unregister_pernet_device(&cfg80211_pernet_ops);
1625 	destroy_workqueue(cfg80211_wq);
1626 }
1627 module_exit(cfg80211_exit);
1628