xref: /openbmc/linux/net/wireless/core.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
1 /*
2  * This is the linux wireless configuration interface.
3  *
4  * Copyright 2006-2009		Johannes Berg <johannes@sipsolutions.net>
5  */
6 
7 #include <linux/if.h>
8 #include <linux/module.h>
9 #include <linux/err.h>
10 #include <linux/list.h>
11 #include <linux/nl80211.h>
12 #include <linux/debugfs.h>
13 #include <linux/notifier.h>
14 #include <linux/device.h>
15 #include <linux/etherdevice.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/sched.h>
18 #include <net/genetlink.h>
19 #include <net/cfg80211.h>
20 #include "nl80211.h"
21 #include "core.h"
22 #include "sysfs.h"
23 #include "debugfs.h"
24 #include "wext-compat.h"
25 #include "ethtool.h"
26 
27 /* name for sysfs, %d is appended */
28 #define PHY_NAME "phy"
29 
30 MODULE_AUTHOR("Johannes Berg");
31 MODULE_LICENSE("GPL");
32 MODULE_DESCRIPTION("wireless configuration support");
33 
34 /* RCU might be appropriate here since we usually
35  * only read the list, and that can happen quite
36  * often because we need to do it for each command */
37 LIST_HEAD(cfg80211_rdev_list);
38 int cfg80211_rdev_list_generation;
39 
40 /*
41  * This is used to protect the cfg80211_rdev_list
42  */
43 DEFINE_MUTEX(cfg80211_mutex);
44 
45 /* for debugfs */
46 static struct dentry *ieee80211_debugfs_dir;
47 
48 /* for the cleanup, scan and event works */
49 struct workqueue_struct *cfg80211_wq;
50 
51 /* requires cfg80211_mutex to be held! */
52 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
53 {
54 	struct cfg80211_registered_device *result = NULL, *rdev;
55 
56 	if (!wiphy_idx_valid(wiphy_idx))
57 		return NULL;
58 
59 	assert_cfg80211_lock();
60 
61 	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
62 		if (rdev->wiphy_idx == wiphy_idx) {
63 			result = rdev;
64 			break;
65 		}
66 	}
67 
68 	return result;
69 }
70 
71 int get_wiphy_idx(struct wiphy *wiphy)
72 {
73 	struct cfg80211_registered_device *rdev;
74 	if (!wiphy)
75 		return WIPHY_IDX_STALE;
76 	rdev = wiphy_to_dev(wiphy);
77 	return rdev->wiphy_idx;
78 }
79 
80 /* requires cfg80211_rdev_mutex to be held! */
81 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
82 {
83 	struct cfg80211_registered_device *rdev;
84 
85 	if (!wiphy_idx_valid(wiphy_idx))
86 		return NULL;
87 
88 	assert_cfg80211_lock();
89 
90 	rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
91 	if (!rdev)
92 		return NULL;
93 	return &rdev->wiphy;
94 }
95 
96 /* requires cfg80211_mutex to be held! */
97 struct cfg80211_registered_device *
98 __cfg80211_rdev_from_info(struct genl_info *info)
99 {
100 	int ifindex;
101 	struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
102 	struct net_device *dev;
103 	int err = -EINVAL;
104 
105 	assert_cfg80211_lock();
106 
107 	if (info->attrs[NL80211_ATTR_WIPHY]) {
108 		bywiphyidx = cfg80211_rdev_by_wiphy_idx(
109 				nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
110 		err = -ENODEV;
111 	}
112 
113 	if (info->attrs[NL80211_ATTR_IFINDEX]) {
114 		ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
115 		dev = dev_get_by_index(genl_info_net(info), ifindex);
116 		if (dev) {
117 			if (dev->ieee80211_ptr)
118 				byifidx =
119 					wiphy_to_dev(dev->ieee80211_ptr->wiphy);
120 			dev_put(dev);
121 		}
122 		err = -ENODEV;
123 	}
124 
125 	if (bywiphyidx && byifidx) {
126 		if (bywiphyidx != byifidx)
127 			return ERR_PTR(-EINVAL);
128 		else
129 			return bywiphyidx; /* == byifidx */
130 	}
131 	if (bywiphyidx)
132 		return bywiphyidx;
133 
134 	if (byifidx)
135 		return byifidx;
136 
137 	return ERR_PTR(err);
138 }
139 
140 struct cfg80211_registered_device *
141 cfg80211_get_dev_from_info(struct genl_info *info)
142 {
143 	struct cfg80211_registered_device *rdev;
144 
145 	mutex_lock(&cfg80211_mutex);
146 	rdev = __cfg80211_rdev_from_info(info);
147 
148 	/* if it is not an error we grab the lock on
149 	 * it to assure it won't be going away while
150 	 * we operate on it */
151 	if (!IS_ERR(rdev))
152 		mutex_lock(&rdev->mtx);
153 
154 	mutex_unlock(&cfg80211_mutex);
155 
156 	return rdev;
157 }
158 
159 struct cfg80211_registered_device *
160 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
161 {
162 	struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
163 	struct net_device *dev;
164 
165 	mutex_lock(&cfg80211_mutex);
166 	dev = dev_get_by_index(net, ifindex);
167 	if (!dev)
168 		goto out;
169 	if (dev->ieee80211_ptr) {
170 		rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
171 		mutex_lock(&rdev->mtx);
172 	} else
173 		rdev = ERR_PTR(-ENODEV);
174 	dev_put(dev);
175  out:
176 	mutex_unlock(&cfg80211_mutex);
177 	return rdev;
178 }
179 
180 /* requires cfg80211_mutex to be held */
181 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
182 			char *newname)
183 {
184 	struct cfg80211_registered_device *rdev2;
185 	int wiphy_idx, taken = -1, result, digits;
186 
187 	assert_cfg80211_lock();
188 
189 	/* prohibit calling the thing phy%d when %d is not its number */
190 	sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
191 	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
192 		/* count number of places needed to print wiphy_idx */
193 		digits = 1;
194 		while (wiphy_idx /= 10)
195 			digits++;
196 		/*
197 		 * deny the name if it is phy<idx> where <idx> is printed
198 		 * without leading zeroes. taken == strlen(newname) here
199 		 */
200 		if (taken == strlen(PHY_NAME) + digits)
201 			return -EINVAL;
202 	}
203 
204 
205 	/* Ignore nop renames */
206 	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
207 		return 0;
208 
209 	/* Ensure another device does not already have this name. */
210 	list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
211 		if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
212 			return -EINVAL;
213 
214 	result = device_rename(&rdev->wiphy.dev, newname);
215 	if (result)
216 		return result;
217 
218 	if (rdev->wiphy.debugfsdir &&
219 	    !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
220 			    rdev->wiphy.debugfsdir,
221 			    rdev->wiphy.debugfsdir->d_parent,
222 			    newname))
223 		printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
224 		       newname);
225 
226 	nl80211_notify_dev_rename(rdev);
227 
228 	return 0;
229 }
230 
231 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
232 			  struct net *net)
233 {
234 	struct wireless_dev *wdev;
235 	int err = 0;
236 
237 	if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
238 		return -EOPNOTSUPP;
239 
240 	list_for_each_entry(wdev, &rdev->netdev_list, list) {
241 		wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
242 		err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
243 		if (err)
244 			break;
245 		wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
246 	}
247 
248 	if (err) {
249 		/* failed -- clean up to old netns */
250 		net = wiphy_net(&rdev->wiphy);
251 
252 		list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
253 						     list) {
254 			wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
255 			err = dev_change_net_namespace(wdev->netdev, net,
256 							"wlan%d");
257 			WARN_ON(err);
258 			wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
259 		}
260 	}
261 
262 	wiphy_net_set(&rdev->wiphy, net);
263 
264 	return err;
265 }
266 
267 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
268 {
269 	struct cfg80211_registered_device *rdev = data;
270 
271 	rdev->ops->rfkill_poll(&rdev->wiphy);
272 }
273 
274 static int cfg80211_rfkill_set_block(void *data, bool blocked)
275 {
276 	struct cfg80211_registered_device *rdev = data;
277 	struct wireless_dev *wdev;
278 
279 	if (!blocked)
280 		return 0;
281 
282 	rtnl_lock();
283 	mutex_lock(&rdev->devlist_mtx);
284 
285 	list_for_each_entry(wdev, &rdev->netdev_list, list)
286 		dev_close(wdev->netdev);
287 
288 	mutex_unlock(&rdev->devlist_mtx);
289 	rtnl_unlock();
290 
291 	return 0;
292 }
293 
294 static void cfg80211_rfkill_sync_work(struct work_struct *work)
295 {
296 	struct cfg80211_registered_device *rdev;
297 
298 	rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
299 	cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
300 }
301 
302 static void cfg80211_event_work(struct work_struct *work)
303 {
304 	struct cfg80211_registered_device *rdev;
305 
306 	rdev = container_of(work, struct cfg80211_registered_device,
307 			    event_work);
308 
309 	rtnl_lock();
310 	cfg80211_lock_rdev(rdev);
311 
312 	cfg80211_process_rdev_events(rdev);
313 	cfg80211_unlock_rdev(rdev);
314 	rtnl_unlock();
315 }
316 
317 /* exported functions */
318 
319 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
320 {
321 	static int wiphy_counter;
322 
323 	struct cfg80211_registered_device *rdev;
324 	int alloc_size;
325 
326 	WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
327 	WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
328 	WARN_ON(ops->connect && !ops->disconnect);
329 	WARN_ON(ops->join_ibss && !ops->leave_ibss);
330 	WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
331 	WARN_ON(ops->add_station && !ops->del_station);
332 	WARN_ON(ops->add_mpath && !ops->del_mpath);
333 
334 	alloc_size = sizeof(*rdev) + sizeof_priv;
335 
336 	rdev = kzalloc(alloc_size, GFP_KERNEL);
337 	if (!rdev)
338 		return NULL;
339 
340 	rdev->ops = ops;
341 
342 	mutex_lock(&cfg80211_mutex);
343 
344 	rdev->wiphy_idx = wiphy_counter++;
345 
346 	if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
347 		wiphy_counter--;
348 		mutex_unlock(&cfg80211_mutex);
349 		/* ugh, wrapped! */
350 		kfree(rdev);
351 		return NULL;
352 	}
353 
354 	mutex_unlock(&cfg80211_mutex);
355 
356 	/* give it a proper name */
357 	dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
358 
359 	mutex_init(&rdev->mtx);
360 	mutex_init(&rdev->devlist_mtx);
361 	INIT_LIST_HEAD(&rdev->netdev_list);
362 	spin_lock_init(&rdev->bss_lock);
363 	INIT_LIST_HEAD(&rdev->bss_list);
364 	INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
365 
366 #ifdef CONFIG_CFG80211_WEXT
367 	rdev->wiphy.wext = &cfg80211_wext_handler;
368 #endif
369 
370 	device_initialize(&rdev->wiphy.dev);
371 	rdev->wiphy.dev.class = &ieee80211_class;
372 	rdev->wiphy.dev.platform_data = rdev;
373 
374 #ifdef CONFIG_CFG80211_DEFAULT_PS
375 	rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
376 #endif
377 
378 	wiphy_net_set(&rdev->wiphy, &init_net);
379 
380 	rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
381 	rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
382 				   &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
383 				   &rdev->rfkill_ops, rdev);
384 
385 	if (!rdev->rfkill) {
386 		kfree(rdev);
387 		return NULL;
388 	}
389 
390 	INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
391 	INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
392 	INIT_WORK(&rdev->event_work, cfg80211_event_work);
393 
394 	init_waitqueue_head(&rdev->dev_wait);
395 
396 	/*
397 	 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
398 	 * Fragmentation and RTS threshold are disabled by default with the
399 	 * special -1 value.
400 	 */
401 	rdev->wiphy.retry_short = 7;
402 	rdev->wiphy.retry_long = 4;
403 	rdev->wiphy.frag_threshold = (u32) -1;
404 	rdev->wiphy.rts_threshold = (u32) -1;
405 
406 	return &rdev->wiphy;
407 }
408 EXPORT_SYMBOL(wiphy_new);
409 
410 int wiphy_register(struct wiphy *wiphy)
411 {
412 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
413 	int res;
414 	enum ieee80211_band band;
415 	struct ieee80211_supported_band *sband;
416 	bool have_band = false;
417 	int i;
418 	u16 ifmodes = wiphy->interface_modes;
419 
420 	/* sanity check ifmodes */
421 	WARN_ON(!ifmodes);
422 	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
423 	if (WARN_ON(ifmodes != wiphy->interface_modes))
424 		wiphy->interface_modes = ifmodes;
425 
426 	/* sanity check supported bands/channels */
427 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
428 		sband = wiphy->bands[band];
429 		if (!sband)
430 			continue;
431 
432 		sband->band = band;
433 
434 		if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
435 			return -EINVAL;
436 
437 		/*
438 		 * Since we use a u32 for rate bitmaps in
439 		 * ieee80211_get_response_rate, we cannot
440 		 * have more than 32 legacy rates.
441 		 */
442 		if (WARN_ON(sband->n_bitrates > 32))
443 			return -EINVAL;
444 
445 		for (i = 0; i < sband->n_channels; i++) {
446 			sband->channels[i].orig_flags =
447 				sband->channels[i].flags;
448 			sband->channels[i].orig_mag =
449 				sband->channels[i].max_antenna_gain;
450 			sband->channels[i].orig_mpwr =
451 				sband->channels[i].max_power;
452 			sband->channels[i].band = band;
453 		}
454 
455 		have_band = true;
456 	}
457 
458 	if (!have_band) {
459 		WARN_ON(1);
460 		return -EINVAL;
461 	}
462 
463 	/* check and set up bitrates */
464 	ieee80211_set_bitrate_flags(wiphy);
465 
466 	res = device_add(&rdev->wiphy.dev);
467 	if (res)
468 		return res;
469 
470 	res = rfkill_register(rdev->rfkill);
471 	if (res)
472 		goto out_rm_dev;
473 
474 	mutex_lock(&cfg80211_mutex);
475 
476 	/* set up regulatory info */
477 	wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
478 
479 	list_add(&rdev->list, &cfg80211_rdev_list);
480 	cfg80211_rdev_list_generation++;
481 
482 	mutex_unlock(&cfg80211_mutex);
483 
484 	/* add to debugfs */
485 	rdev->wiphy.debugfsdir =
486 		debugfs_create_dir(wiphy_name(&rdev->wiphy),
487 				   ieee80211_debugfs_dir);
488 	if (IS_ERR(rdev->wiphy.debugfsdir))
489 		rdev->wiphy.debugfsdir = NULL;
490 
491 	if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
492 		struct regulatory_request request;
493 
494 		request.wiphy_idx = get_wiphy_idx(wiphy);
495 		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
496 		request.alpha2[0] = '9';
497 		request.alpha2[1] = '9';
498 
499 		nl80211_send_reg_change_event(&request);
500 	}
501 
502 	cfg80211_debugfs_rdev_add(rdev);
503 
504 	return 0;
505 
506  out_rm_dev:
507 	device_del(&rdev->wiphy.dev);
508 	return res;
509 }
510 EXPORT_SYMBOL(wiphy_register);
511 
512 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
513 {
514 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
515 
516 	if (!rdev->ops->rfkill_poll)
517 		return;
518 	rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
519 	rfkill_resume_polling(rdev->rfkill);
520 }
521 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
522 
523 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
524 {
525 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
526 
527 	rfkill_pause_polling(rdev->rfkill);
528 }
529 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
530 
531 void wiphy_unregister(struct wiphy *wiphy)
532 {
533 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
534 
535 	rfkill_unregister(rdev->rfkill);
536 
537 	/* protect the device list */
538 	mutex_lock(&cfg80211_mutex);
539 
540 	wait_event(rdev->dev_wait, ({
541 		int __count;
542 		mutex_lock(&rdev->devlist_mtx);
543 		__count = rdev->opencount;
544 		mutex_unlock(&rdev->devlist_mtx);
545 		__count == 0;}));
546 
547 	mutex_lock(&rdev->devlist_mtx);
548 	BUG_ON(!list_empty(&rdev->netdev_list));
549 	mutex_unlock(&rdev->devlist_mtx);
550 
551 	/*
552 	 * First remove the hardware from everywhere, this makes
553 	 * it impossible to find from userspace.
554 	 */
555 	debugfs_remove_recursive(rdev->wiphy.debugfsdir);
556 	list_del(&rdev->list);
557 
558 	/*
559 	 * Try to grab rdev->mtx. If a command is still in progress,
560 	 * hopefully the driver will refuse it since it's tearing
561 	 * down the device already. We wait for this command to complete
562 	 * before unlinking the item from the list.
563 	 * Note: as codified by the BUG_ON above we cannot get here if
564 	 * a virtual interface is still present. Hence, we can only get
565 	 * to lock contention here if userspace issues a command that
566 	 * identified the hardware by wiphy index.
567 	 */
568 	cfg80211_lock_rdev(rdev);
569 	/* nothing */
570 	cfg80211_unlock_rdev(rdev);
571 
572 	/* If this device got a regulatory hint tell core its
573 	 * free to listen now to a new shiny device regulatory hint */
574 	reg_device_remove(wiphy);
575 
576 	cfg80211_rdev_list_generation++;
577 	device_del(&rdev->wiphy.dev);
578 
579 	mutex_unlock(&cfg80211_mutex);
580 
581 	flush_work(&rdev->scan_done_wk);
582 	cancel_work_sync(&rdev->conn_work);
583 	flush_work(&rdev->event_work);
584 }
585 EXPORT_SYMBOL(wiphy_unregister);
586 
587 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
588 {
589 	struct cfg80211_internal_bss *scan, *tmp;
590 	rfkill_destroy(rdev->rfkill);
591 	mutex_destroy(&rdev->mtx);
592 	mutex_destroy(&rdev->devlist_mtx);
593 	list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
594 		cfg80211_put_bss(&scan->pub);
595 	kfree(rdev);
596 }
597 
598 void wiphy_free(struct wiphy *wiphy)
599 {
600 	put_device(&wiphy->dev);
601 }
602 EXPORT_SYMBOL(wiphy_free);
603 
604 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
605 {
606 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
607 
608 	if (rfkill_set_hw_state(rdev->rfkill, blocked))
609 		schedule_work(&rdev->rfkill_sync);
610 }
611 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
612 
613 static void wdev_cleanup_work(struct work_struct *work)
614 {
615 	struct wireless_dev *wdev;
616 	struct cfg80211_registered_device *rdev;
617 
618 	wdev = container_of(work, struct wireless_dev, cleanup_work);
619 	rdev = wiphy_to_dev(wdev->wiphy);
620 
621 	cfg80211_lock_rdev(rdev);
622 
623 	if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
624 		rdev->scan_req->aborted = true;
625 		___cfg80211_scan_done(rdev, true);
626 	}
627 
628 	cfg80211_unlock_rdev(rdev);
629 
630 	mutex_lock(&rdev->devlist_mtx);
631 	rdev->opencount--;
632 	mutex_unlock(&rdev->devlist_mtx);
633 	wake_up(&rdev->dev_wait);
634 
635 	dev_put(wdev->netdev);
636 }
637 
638 static struct device_type wiphy_type = {
639 	.name	= "wlan",
640 };
641 
642 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
643 					 unsigned long state,
644 					 void *ndev)
645 {
646 	struct net_device *dev = ndev;
647 	struct wireless_dev *wdev = dev->ieee80211_ptr;
648 	struct cfg80211_registered_device *rdev;
649 
650 	if (!wdev)
651 		return NOTIFY_DONE;
652 
653 	rdev = wiphy_to_dev(wdev->wiphy);
654 
655 	WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
656 
657 	switch (state) {
658 	case NETDEV_POST_INIT:
659 		SET_NETDEV_DEVTYPE(dev, &wiphy_type);
660 		break;
661 	case NETDEV_REGISTER:
662 		/*
663 		 * NB: cannot take rdev->mtx here because this may be
664 		 * called within code protected by it when interfaces
665 		 * are added with nl80211.
666 		 */
667 		mutex_init(&wdev->mtx);
668 		INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
669 		INIT_LIST_HEAD(&wdev->event_list);
670 		spin_lock_init(&wdev->event_lock);
671 		mutex_lock(&rdev->devlist_mtx);
672 		list_add(&wdev->list, &rdev->netdev_list);
673 		rdev->devlist_generation++;
674 		/* can only change netns with wiphy */
675 		dev->features |= NETIF_F_NETNS_LOCAL;
676 
677 		if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
678 				      "phy80211")) {
679 			printk(KERN_ERR "wireless: failed to add phy80211 "
680 				"symlink to netdev!\n");
681 		}
682 		wdev->netdev = dev;
683 		wdev->sme_state = CFG80211_SME_IDLE;
684 		mutex_unlock(&rdev->devlist_mtx);
685 #ifdef CONFIG_CFG80211_WEXT
686 		wdev->wext.default_key = -1;
687 		wdev->wext.default_mgmt_key = -1;
688 		wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
689 		if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
690 			wdev->wext.ps = true;
691 		else
692 			wdev->wext.ps = false;
693 		wdev->wext.ps_timeout = 100;
694 		if (rdev->ops->set_power_mgmt)
695 			if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
696 						      wdev->wext.ps,
697 						      wdev->wext.ps_timeout)) {
698 				/* assume this means it's off */
699 				wdev->wext.ps = false;
700 			}
701 #endif
702 		if (!dev->ethtool_ops)
703 			dev->ethtool_ops = &cfg80211_ethtool_ops;
704 
705 		if ((wdev->iftype == NL80211_IFTYPE_STATION ||
706 		     wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
707 			dev->priv_flags |= IFF_DONT_BRIDGE;
708 		break;
709 	case NETDEV_GOING_DOWN:
710 		switch (wdev->iftype) {
711 		case NL80211_IFTYPE_ADHOC:
712 			cfg80211_leave_ibss(rdev, dev, true);
713 			break;
714 		case NL80211_IFTYPE_STATION:
715 			wdev_lock(wdev);
716 #ifdef CONFIG_CFG80211_WEXT
717 			kfree(wdev->wext.ie);
718 			wdev->wext.ie = NULL;
719 			wdev->wext.ie_len = 0;
720 			wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
721 #endif
722 			__cfg80211_disconnect(rdev, dev,
723 					      WLAN_REASON_DEAUTH_LEAVING, true);
724 			cfg80211_mlme_down(rdev, dev);
725 			wdev_unlock(wdev);
726 			break;
727 		default:
728 			break;
729 		}
730 		break;
731 	case NETDEV_DOWN:
732 		dev_hold(dev);
733 		queue_work(cfg80211_wq, &wdev->cleanup_work);
734 		break;
735 	case NETDEV_UP:
736 		/*
737 		 * If we have a really quick DOWN/UP succession we may
738 		 * have this work still pending ... cancel it and see
739 		 * if it was pending, in which case we need to account
740 		 * for some of the work it would have done.
741 		 */
742 		if (cancel_work_sync(&wdev->cleanup_work)) {
743 			mutex_lock(&rdev->devlist_mtx);
744 			rdev->opencount--;
745 			mutex_unlock(&rdev->devlist_mtx);
746 			dev_put(dev);
747 		}
748 		cfg80211_lock_rdev(rdev);
749 		mutex_lock(&rdev->devlist_mtx);
750 #ifdef CONFIG_CFG80211_WEXT
751 		wdev_lock(wdev);
752 		switch (wdev->iftype) {
753 		case NL80211_IFTYPE_ADHOC:
754 			cfg80211_ibss_wext_join(rdev, wdev);
755 			break;
756 		case NL80211_IFTYPE_STATION:
757 			cfg80211_mgd_wext_connect(rdev, wdev);
758 			break;
759 		default:
760 			break;
761 		}
762 		wdev_unlock(wdev);
763 #endif
764 		rdev->opencount++;
765 		mutex_unlock(&rdev->devlist_mtx);
766 		cfg80211_unlock_rdev(rdev);
767 		break;
768 	case NETDEV_UNREGISTER:
769 		/*
770 		 * NB: cannot take rdev->mtx here because this may be
771 		 * called within code protected by it when interfaces
772 		 * are removed with nl80211.
773 		 */
774 		mutex_lock(&rdev->devlist_mtx);
775 		/*
776 		 * It is possible to get NETDEV_UNREGISTER
777 		 * multiple times. To detect that, check
778 		 * that the interface is still on the list
779 		 * of registered interfaces, and only then
780 		 * remove and clean it up.
781 		 */
782 		if (!list_empty(&wdev->list)) {
783 			sysfs_remove_link(&dev->dev.kobj, "phy80211");
784 			list_del_init(&wdev->list);
785 			rdev->devlist_generation++;
786 #ifdef CONFIG_CFG80211_WEXT
787 			kfree(wdev->wext.keys);
788 #endif
789 		}
790 		mutex_unlock(&rdev->devlist_mtx);
791 		break;
792 	case NETDEV_PRE_UP:
793 		if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
794 			return notifier_from_errno(-EOPNOTSUPP);
795 		if (rfkill_blocked(rdev->rfkill))
796 			return notifier_from_errno(-ERFKILL);
797 		break;
798 	}
799 
800 	return NOTIFY_DONE;
801 }
802 
803 static struct notifier_block cfg80211_netdev_notifier = {
804 	.notifier_call = cfg80211_netdev_notifier_call,
805 };
806 
807 static void __net_exit cfg80211_pernet_exit(struct net *net)
808 {
809 	struct cfg80211_registered_device *rdev;
810 
811 	rtnl_lock();
812 	mutex_lock(&cfg80211_mutex);
813 	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
814 		if (net_eq(wiphy_net(&rdev->wiphy), net))
815 			WARN_ON(cfg80211_switch_netns(rdev, &init_net));
816 	}
817 	mutex_unlock(&cfg80211_mutex);
818 	rtnl_unlock();
819 }
820 
821 static struct pernet_operations cfg80211_pernet_ops = {
822 	.exit = cfg80211_pernet_exit,
823 };
824 
825 static int __init cfg80211_init(void)
826 {
827 	int err;
828 
829 	err = register_pernet_device(&cfg80211_pernet_ops);
830 	if (err)
831 		goto out_fail_pernet;
832 
833 	err = wiphy_sysfs_init();
834 	if (err)
835 		goto out_fail_sysfs;
836 
837 	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
838 	if (err)
839 		goto out_fail_notifier;
840 
841 	err = nl80211_init();
842 	if (err)
843 		goto out_fail_nl80211;
844 
845 	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
846 
847 	err = regulatory_init();
848 	if (err)
849 		goto out_fail_reg;
850 
851 	cfg80211_wq = create_singlethread_workqueue("cfg80211");
852 	if (!cfg80211_wq)
853 		goto out_fail_wq;
854 
855 	return 0;
856 
857 out_fail_wq:
858 	regulatory_exit();
859 out_fail_reg:
860 	debugfs_remove(ieee80211_debugfs_dir);
861 out_fail_nl80211:
862 	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
863 out_fail_notifier:
864 	wiphy_sysfs_exit();
865 out_fail_sysfs:
866 	unregister_pernet_device(&cfg80211_pernet_ops);
867 out_fail_pernet:
868 	return err;
869 }
870 subsys_initcall(cfg80211_init);
871 
872 static void cfg80211_exit(void)
873 {
874 	debugfs_remove(ieee80211_debugfs_dir);
875 	nl80211_exit();
876 	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
877 	wiphy_sysfs_exit();
878 	regulatory_exit();
879 	unregister_pernet_device(&cfg80211_pernet_ops);
880 	destroy_workqueue(cfg80211_wq);
881 }
882 module_exit(cfg80211_exit);
883