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[mirror_ubuntu-bionic-kernel.git] / net / wireless / core.c
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);