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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 2006-2010 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-protected (and cfg80211_mutex for writers) */
35 LIST_HEAD(cfg80211_rdev_list);
36 int cfg80211_rdev_list_generation;
37
38 DEFINE_MUTEX(cfg80211_mutex);
39
40 /* for debugfs */
41 static struct dentry *ieee80211_debugfs_dir;
42
43 /* for the cleanup, scan and event works */
44 struct workqueue_struct *cfg80211_wq;
45
46 /* requires cfg80211_mutex to be held! */
47 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
48 {
49 struct cfg80211_registered_device *result = NULL, *rdev;
50
51 if (!wiphy_idx_valid(wiphy_idx))
52 return NULL;
53
54 assert_cfg80211_lock();
55
56 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
57 if (rdev->wiphy_idx == wiphy_idx) {
58 result = rdev;
59 break;
60 }
61 }
62
63 return result;
64 }
65
66 int get_wiphy_idx(struct wiphy *wiphy)
67 {
68 struct cfg80211_registered_device *rdev;
69 if (!wiphy)
70 return WIPHY_IDX_STALE;
71 rdev = wiphy_to_dev(wiphy);
72 return rdev->wiphy_idx;
73 }
74
75 /* requires cfg80211_rdev_mutex to be held! */
76 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
77 {
78 struct cfg80211_registered_device *rdev;
79
80 if (!wiphy_idx_valid(wiphy_idx))
81 return NULL;
82
83 assert_cfg80211_lock();
84
85 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
86 if (!rdev)
87 return NULL;
88 return &rdev->wiphy;
89 }
90
91 /* requires cfg80211_mutex to be held! */
92 struct cfg80211_registered_device *
93 __cfg80211_rdev_from_info(struct genl_info *info)
94 {
95 int ifindex;
96 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
97 struct net_device *dev;
98 int err = -EINVAL;
99
100 assert_cfg80211_lock();
101
102 if (info->attrs[NL80211_ATTR_WIPHY]) {
103 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
104 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
105 err = -ENODEV;
106 }
107
108 if (info->attrs[NL80211_ATTR_IFINDEX]) {
109 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
110 dev = dev_get_by_index(genl_info_net(info), ifindex);
111 if (dev) {
112 if (dev->ieee80211_ptr)
113 byifidx =
114 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
115 dev_put(dev);
116 }
117 err = -ENODEV;
118 }
119
120 if (bywiphyidx && byifidx) {
121 if (bywiphyidx != byifidx)
122 return ERR_PTR(-EINVAL);
123 else
124 return bywiphyidx; /* == byifidx */
125 }
126 if (bywiphyidx)
127 return bywiphyidx;
128
129 if (byifidx)
130 return byifidx;
131
132 return ERR_PTR(err);
133 }
134
135 struct cfg80211_registered_device *
136 cfg80211_get_dev_from_info(struct genl_info *info)
137 {
138 struct cfg80211_registered_device *rdev;
139
140 mutex_lock(&cfg80211_mutex);
141 rdev = __cfg80211_rdev_from_info(info);
142
143 /* if it is not an error we grab the lock on
144 * it to assure it won't be going away while
145 * we operate on it */
146 if (!IS_ERR(rdev))
147 mutex_lock(&rdev->mtx);
148
149 mutex_unlock(&cfg80211_mutex);
150
151 return rdev;
152 }
153
154 struct cfg80211_registered_device *
155 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
156 {
157 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
158 struct net_device *dev;
159
160 mutex_lock(&cfg80211_mutex);
161 dev = dev_get_by_index(net, ifindex);
162 if (!dev)
163 goto out;
164 if (dev->ieee80211_ptr) {
165 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
166 mutex_lock(&rdev->mtx);
167 } else
168 rdev = ERR_PTR(-ENODEV);
169 dev_put(dev);
170 out:
171 mutex_unlock(&cfg80211_mutex);
172 return rdev;
173 }
174
175 /* requires cfg80211_mutex to be held */
176 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
177 char *newname)
178 {
179 struct cfg80211_registered_device *rdev2;
180 int wiphy_idx, taken = -1, result, digits;
181
182 assert_cfg80211_lock();
183
184 /* prohibit calling the thing phy%d when %d is not its number */
185 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
186 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
187 /* count number of places needed to print wiphy_idx */
188 digits = 1;
189 while (wiphy_idx /= 10)
190 digits++;
191 /*
192 * deny the name if it is phy<idx> where <idx> is printed
193 * without leading zeroes. taken == strlen(newname) here
194 */
195 if (taken == strlen(PHY_NAME) + digits)
196 return -EINVAL;
197 }
198
199
200 /* Ignore nop renames */
201 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
202 return 0;
203
204 /* Ensure another device does not already have this name. */
205 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
206 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
207 return -EINVAL;
208
209 result = device_rename(&rdev->wiphy.dev, newname);
210 if (result)
211 return result;
212
213 if (rdev->wiphy.debugfsdir &&
214 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
215 rdev->wiphy.debugfsdir,
216 rdev->wiphy.debugfsdir->d_parent,
217 newname))
218 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
219 newname);
220
221 nl80211_notify_dev_rename(rdev);
222
223 return 0;
224 }
225
226 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
227 struct net *net)
228 {
229 struct wireless_dev *wdev;
230 int err = 0;
231
232 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
233 return -EOPNOTSUPP;
234
235 list_for_each_entry(wdev, &rdev->netdev_list, list) {
236 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
237 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
238 if (err)
239 break;
240 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
241 }
242
243 if (err) {
244 /* failed -- clean up to old netns */
245 net = wiphy_net(&rdev->wiphy);
246
247 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
248 list) {
249 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
250 err = dev_change_net_namespace(wdev->netdev, net,
251 "wlan%d");
252 WARN_ON(err);
253 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
254 }
255 }
256
257 wiphy_net_set(&rdev->wiphy, net);
258
259 return err;
260 }
261
262 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
263 {
264 struct cfg80211_registered_device *rdev = data;
265
266 rdev->ops->rfkill_poll(&rdev->wiphy);
267 }
268
269 static int cfg80211_rfkill_set_block(void *data, bool blocked)
270 {
271 struct cfg80211_registered_device *rdev = data;
272 struct wireless_dev *wdev;
273
274 if (!blocked)
275 return 0;
276
277 rtnl_lock();
278 mutex_lock(&rdev->devlist_mtx);
279
280 list_for_each_entry(wdev, &rdev->netdev_list, list)
281 dev_close(wdev->netdev);
282
283 mutex_unlock(&rdev->devlist_mtx);
284 rtnl_unlock();
285
286 return 0;
287 }
288
289 static void cfg80211_rfkill_sync_work(struct work_struct *work)
290 {
291 struct cfg80211_registered_device *rdev;
292
293 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
294 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
295 }
296
297 static void cfg80211_event_work(struct work_struct *work)
298 {
299 struct cfg80211_registered_device *rdev;
300
301 rdev = container_of(work, struct cfg80211_registered_device,
302 event_work);
303
304 rtnl_lock();
305 cfg80211_lock_rdev(rdev);
306
307 cfg80211_process_rdev_events(rdev);
308 cfg80211_unlock_rdev(rdev);
309 rtnl_unlock();
310 }
311
312 /* exported functions */
313
314 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
315 {
316 static int wiphy_counter;
317
318 struct cfg80211_registered_device *rdev;
319 int alloc_size;
320
321 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
322 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
323 WARN_ON(ops->connect && !ops->disconnect);
324 WARN_ON(ops->join_ibss && !ops->leave_ibss);
325 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
326 WARN_ON(ops->add_station && !ops->del_station);
327 WARN_ON(ops->add_mpath && !ops->del_mpath);
328
329 alloc_size = sizeof(*rdev) + sizeof_priv;
330
331 rdev = kzalloc(alloc_size, GFP_KERNEL);
332 if (!rdev)
333 return NULL;
334
335 rdev->ops = ops;
336
337 mutex_lock(&cfg80211_mutex);
338
339 rdev->wiphy_idx = wiphy_counter++;
340
341 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
342 wiphy_counter--;
343 mutex_unlock(&cfg80211_mutex);
344 /* ugh, wrapped! */
345 kfree(rdev);
346 return NULL;
347 }
348
349 mutex_unlock(&cfg80211_mutex);
350
351 /* give it a proper name */
352 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
353
354 mutex_init(&rdev->mtx);
355 mutex_init(&rdev->devlist_mtx);
356 INIT_LIST_HEAD(&rdev->netdev_list);
357 spin_lock_init(&rdev->bss_lock);
358 INIT_LIST_HEAD(&rdev->bss_list);
359 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
360
361 #ifdef CONFIG_CFG80211_WEXT
362 rdev->wiphy.wext = &cfg80211_wext_handler;
363 #endif
364
365 device_initialize(&rdev->wiphy.dev);
366 rdev->wiphy.dev.class = &ieee80211_class;
367 rdev->wiphy.dev.platform_data = rdev;
368
369 #ifdef CONFIG_CFG80211_DEFAULT_PS
370 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
371 #endif
372
373 wiphy_net_set(&rdev->wiphy, &init_net);
374
375 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
376 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
377 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
378 &rdev->rfkill_ops, rdev);
379
380 if (!rdev->rfkill) {
381 kfree(rdev);
382 return NULL;
383 }
384
385 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
386 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
387 INIT_WORK(&rdev->event_work, cfg80211_event_work);
388
389 init_waitqueue_head(&rdev->dev_wait);
390
391 /*
392 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
393 * Fragmentation and RTS threshold are disabled by default with the
394 * special -1 value.
395 */
396 rdev->wiphy.retry_short = 7;
397 rdev->wiphy.retry_long = 4;
398 rdev->wiphy.frag_threshold = (u32) -1;
399 rdev->wiphy.rts_threshold = (u32) -1;
400 rdev->wiphy.coverage_class = 0;
401
402 return &rdev->wiphy;
403 }
404 EXPORT_SYMBOL(wiphy_new);
405
406 int wiphy_register(struct wiphy *wiphy)
407 {
408 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
409 int res;
410 enum ieee80211_band band;
411 struct ieee80211_supported_band *sband;
412 bool have_band = false;
413 int i;
414 u16 ifmodes = wiphy->interface_modes;
415
416 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
417 return -EINVAL;
418
419 if (WARN_ON(wiphy->addresses &&
420 !is_zero_ether_addr(wiphy->perm_addr) &&
421 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
422 ETH_ALEN)))
423 return -EINVAL;
424
425 if (wiphy->addresses)
426 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
427
428 /* sanity check ifmodes */
429 WARN_ON(!ifmodes);
430 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
431 if (WARN_ON(ifmodes != wiphy->interface_modes))
432 wiphy->interface_modes = ifmodes;
433
434 /* sanity check supported bands/channels */
435 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
436 sband = wiphy->bands[band];
437 if (!sband)
438 continue;
439
440 sband->band = band;
441
442 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
443 return -EINVAL;
444
445 /*
446 * Since we use a u32 for rate bitmaps in
447 * ieee80211_get_response_rate, we cannot
448 * have more than 32 legacy rates.
449 */
450 if (WARN_ON(sband->n_bitrates > 32))
451 return -EINVAL;
452
453 for (i = 0; i < sband->n_channels; i++) {
454 sband->channels[i].orig_flags =
455 sband->channels[i].flags;
456 sband->channels[i].orig_mag =
457 sband->channels[i].max_antenna_gain;
458 sband->channels[i].orig_mpwr =
459 sband->channels[i].max_power;
460 sband->channels[i].band = band;
461 }
462
463 have_band = true;
464 }
465
466 if (!have_band) {
467 WARN_ON(1);
468 return -EINVAL;
469 }
470
471 /* check and set up bitrates */
472 ieee80211_set_bitrate_flags(wiphy);
473
474 res = device_add(&rdev->wiphy.dev);
475 if (res)
476 return res;
477
478 res = rfkill_register(rdev->rfkill);
479 if (res)
480 goto out_rm_dev;
481
482 mutex_lock(&cfg80211_mutex);
483
484 /* set up regulatory info */
485 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
486
487 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
488 cfg80211_rdev_list_generation++;
489
490 mutex_unlock(&cfg80211_mutex);
491
492 /* add to debugfs */
493 rdev->wiphy.debugfsdir =
494 debugfs_create_dir(wiphy_name(&rdev->wiphy),
495 ieee80211_debugfs_dir);
496 if (IS_ERR(rdev->wiphy.debugfsdir))
497 rdev->wiphy.debugfsdir = NULL;
498
499 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
500 struct regulatory_request request;
501
502 request.wiphy_idx = get_wiphy_idx(wiphy);
503 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
504 request.alpha2[0] = '9';
505 request.alpha2[1] = '9';
506
507 nl80211_send_reg_change_event(&request);
508 }
509
510 cfg80211_debugfs_rdev_add(rdev);
511
512 return 0;
513
514 out_rm_dev:
515 device_del(&rdev->wiphy.dev);
516 return res;
517 }
518 EXPORT_SYMBOL(wiphy_register);
519
520 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
521 {
522 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
523
524 if (!rdev->ops->rfkill_poll)
525 return;
526 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
527 rfkill_resume_polling(rdev->rfkill);
528 }
529 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
530
531 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
532 {
533 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
534
535 rfkill_pause_polling(rdev->rfkill);
536 }
537 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
538
539 void wiphy_unregister(struct wiphy *wiphy)
540 {
541 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
542
543 rfkill_unregister(rdev->rfkill);
544
545 /* protect the device list */
546 mutex_lock(&cfg80211_mutex);
547
548 wait_event(rdev->dev_wait, ({
549 int __count;
550 mutex_lock(&rdev->devlist_mtx);
551 __count = rdev->opencount;
552 mutex_unlock(&rdev->devlist_mtx);
553 __count == 0;}));
554
555 mutex_lock(&rdev->devlist_mtx);
556 BUG_ON(!list_empty(&rdev->netdev_list));
557 mutex_unlock(&rdev->devlist_mtx);
558
559 /*
560 * First remove the hardware from everywhere, this makes
561 * it impossible to find from userspace.
562 */
563 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
564 list_del_rcu(&rdev->list);
565 synchronize_rcu();
566
567 /*
568 * Try to grab rdev->mtx. If a command is still in progress,
569 * hopefully the driver will refuse it since it's tearing
570 * down the device already. We wait for this command to complete
571 * before unlinking the item from the list.
572 * Note: as codified by the BUG_ON above we cannot get here if
573 * a virtual interface is still present. Hence, we can only get
574 * to lock contention here if userspace issues a command that
575 * identified the hardware by wiphy index.
576 */
577 cfg80211_lock_rdev(rdev);
578 /* nothing */
579 cfg80211_unlock_rdev(rdev);
580
581 /* If this device got a regulatory hint tell core its
582 * free to listen now to a new shiny device regulatory hint */
583 reg_device_remove(wiphy);
584
585 cfg80211_rdev_list_generation++;
586 device_del(&rdev->wiphy.dev);
587
588 mutex_unlock(&cfg80211_mutex);
589
590 flush_work(&rdev->scan_done_wk);
591 cancel_work_sync(&rdev->conn_work);
592 flush_work(&rdev->event_work);
593 }
594 EXPORT_SYMBOL(wiphy_unregister);
595
596 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
597 {
598 struct cfg80211_internal_bss *scan, *tmp;
599 rfkill_destroy(rdev->rfkill);
600 mutex_destroy(&rdev->mtx);
601 mutex_destroy(&rdev->devlist_mtx);
602 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
603 cfg80211_put_bss(&scan->pub);
604 kfree(rdev);
605 }
606
607 void wiphy_free(struct wiphy *wiphy)
608 {
609 put_device(&wiphy->dev);
610 }
611 EXPORT_SYMBOL(wiphy_free);
612
613 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
614 {
615 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
616
617 if (rfkill_set_hw_state(rdev->rfkill, blocked))
618 schedule_work(&rdev->rfkill_sync);
619 }
620 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
621
622 static void wdev_cleanup_work(struct work_struct *work)
623 {
624 struct wireless_dev *wdev;
625 struct cfg80211_registered_device *rdev;
626
627 wdev = container_of(work, struct wireless_dev, cleanup_work);
628 rdev = wiphy_to_dev(wdev->wiphy);
629
630 cfg80211_lock_rdev(rdev);
631
632 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
633 rdev->scan_req->aborted = true;
634 ___cfg80211_scan_done(rdev, true);
635 }
636
637 cfg80211_unlock_rdev(rdev);
638
639 mutex_lock(&rdev->devlist_mtx);
640 rdev->opencount--;
641 mutex_unlock(&rdev->devlist_mtx);
642 wake_up(&rdev->dev_wait);
643
644 dev_put(wdev->netdev);
645 }
646
647 static struct device_type wiphy_type = {
648 .name = "wlan",
649 };
650
651 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
652 unsigned long state,
653 void *ndev)
654 {
655 struct net_device *dev = ndev;
656 struct wireless_dev *wdev = dev->ieee80211_ptr;
657 struct cfg80211_registered_device *rdev;
658
659 if (!wdev)
660 return NOTIFY_DONE;
661
662 rdev = wiphy_to_dev(wdev->wiphy);
663
664 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
665
666 switch (state) {
667 case NETDEV_POST_INIT:
668 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
669 break;
670 case NETDEV_REGISTER:
671 /*
672 * NB: cannot take rdev->mtx here because this may be
673 * called within code protected by it when interfaces
674 * are added with nl80211.
675 */
676 mutex_init(&wdev->mtx);
677 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
678 INIT_LIST_HEAD(&wdev->event_list);
679 spin_lock_init(&wdev->event_lock);
680 INIT_LIST_HEAD(&wdev->action_registrations);
681 spin_lock_init(&wdev->action_registrations_lock);
682
683 mutex_lock(&rdev->devlist_mtx);
684 list_add_rcu(&wdev->list, &rdev->netdev_list);
685 rdev->devlist_generation++;
686 /* can only change netns with wiphy */
687 dev->features |= NETIF_F_NETNS_LOCAL;
688
689 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
690 "phy80211")) {
691 printk(KERN_ERR "wireless: failed to add phy80211 "
692 "symlink to netdev!\n");
693 }
694 wdev->netdev = dev;
695 wdev->sme_state = CFG80211_SME_IDLE;
696 mutex_unlock(&rdev->devlist_mtx);
697 #ifdef CONFIG_CFG80211_WEXT
698 wdev->wext.default_key = -1;
699 wdev->wext.default_mgmt_key = -1;
700 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
701 #endif
702
703 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
704 wdev->ps = true;
705 else
706 wdev->ps = false;
707 wdev->ps_timeout = 100;
708 if (rdev->ops->set_power_mgmt)
709 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
710 wdev->ps,
711 wdev->ps_timeout)) {
712 /* assume this means it's off */
713 wdev->ps = false;
714 }
715
716 if (!dev->ethtool_ops)
717 dev->ethtool_ops = &cfg80211_ethtool_ops;
718
719 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
720 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
721 dev->priv_flags |= IFF_DONT_BRIDGE;
722 break;
723 case NETDEV_GOING_DOWN:
724 switch (wdev->iftype) {
725 case NL80211_IFTYPE_ADHOC:
726 cfg80211_leave_ibss(rdev, dev, true);
727 break;
728 case NL80211_IFTYPE_STATION:
729 wdev_lock(wdev);
730 #ifdef CONFIG_CFG80211_WEXT
731 kfree(wdev->wext.ie);
732 wdev->wext.ie = NULL;
733 wdev->wext.ie_len = 0;
734 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
735 #endif
736 __cfg80211_disconnect(rdev, dev,
737 WLAN_REASON_DEAUTH_LEAVING, true);
738 cfg80211_mlme_down(rdev, dev);
739 wdev_unlock(wdev);
740 break;
741 default:
742 break;
743 }
744 break;
745 case NETDEV_DOWN:
746 dev_hold(dev);
747 queue_work(cfg80211_wq, &wdev->cleanup_work);
748 break;
749 case NETDEV_UP:
750 /*
751 * If we have a really quick DOWN/UP succession we may
752 * have this work still pending ... cancel it and see
753 * if it was pending, in which case we need to account
754 * for some of the work it would have done.
755 */
756 if (cancel_work_sync(&wdev->cleanup_work)) {
757 mutex_lock(&rdev->devlist_mtx);
758 rdev->opencount--;
759 mutex_unlock(&rdev->devlist_mtx);
760 dev_put(dev);
761 }
762 cfg80211_lock_rdev(rdev);
763 mutex_lock(&rdev->devlist_mtx);
764 #ifdef CONFIG_CFG80211_WEXT
765 wdev_lock(wdev);
766 switch (wdev->iftype) {
767 case NL80211_IFTYPE_ADHOC:
768 cfg80211_ibss_wext_join(rdev, wdev);
769 break;
770 case NL80211_IFTYPE_STATION:
771 cfg80211_mgd_wext_connect(rdev, wdev);
772 break;
773 default:
774 break;
775 }
776 wdev_unlock(wdev);
777 #endif
778 rdev->opencount++;
779 mutex_unlock(&rdev->devlist_mtx);
780 cfg80211_unlock_rdev(rdev);
781 break;
782 case NETDEV_UNREGISTER:
783 /*
784 * NB: cannot take rdev->mtx here because this may be
785 * called within code protected by it when interfaces
786 * are removed with nl80211.
787 */
788 mutex_lock(&rdev->devlist_mtx);
789 /*
790 * It is possible to get NETDEV_UNREGISTER
791 * multiple times. To detect that, check
792 * that the interface is still on the list
793 * of registered interfaces, and only then
794 * remove and clean it up.
795 */
796 if (!list_empty(&wdev->list)) {
797 sysfs_remove_link(&dev->dev.kobj, "phy80211");
798 list_del_rcu(&wdev->list);
799 rdev->devlist_generation++;
800 cfg80211_mlme_purge_actions(wdev);
801 #ifdef CONFIG_CFG80211_WEXT
802 kfree(wdev->wext.keys);
803 #endif
804 }
805 mutex_unlock(&rdev->devlist_mtx);
806 /*
807 * synchronise (so that we won't find this netdev
808 * from other code any more) and then clear the list
809 * head so that the above code can safely check for
810 * !list_empty() to avoid double-cleanup.
811 */
812 synchronize_rcu();
813 INIT_LIST_HEAD(&wdev->list);
814 break;
815 case NETDEV_PRE_UP:
816 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
817 return notifier_from_errno(-EOPNOTSUPP);
818 if (rfkill_blocked(rdev->rfkill))
819 return notifier_from_errno(-ERFKILL);
820 break;
821 }
822
823 return NOTIFY_DONE;
824 }
825
826 static struct notifier_block cfg80211_netdev_notifier = {
827 .notifier_call = cfg80211_netdev_notifier_call,
828 };
829
830 static void __net_exit cfg80211_pernet_exit(struct net *net)
831 {
832 struct cfg80211_registered_device *rdev;
833
834 rtnl_lock();
835 mutex_lock(&cfg80211_mutex);
836 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
837 if (net_eq(wiphy_net(&rdev->wiphy), net))
838 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
839 }
840 mutex_unlock(&cfg80211_mutex);
841 rtnl_unlock();
842 }
843
844 static struct pernet_operations cfg80211_pernet_ops = {
845 .exit = cfg80211_pernet_exit,
846 };
847
848 static int __init cfg80211_init(void)
849 {
850 int err;
851
852 err = register_pernet_device(&cfg80211_pernet_ops);
853 if (err)
854 goto out_fail_pernet;
855
856 err = wiphy_sysfs_init();
857 if (err)
858 goto out_fail_sysfs;
859
860 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
861 if (err)
862 goto out_fail_notifier;
863
864 err = nl80211_init();
865 if (err)
866 goto out_fail_nl80211;
867
868 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
869
870 err = regulatory_init();
871 if (err)
872 goto out_fail_reg;
873
874 cfg80211_wq = create_singlethread_workqueue("cfg80211");
875 if (!cfg80211_wq)
876 goto out_fail_wq;
877
878 return 0;
879
880 out_fail_wq:
881 regulatory_exit();
882 out_fail_reg:
883 debugfs_remove(ieee80211_debugfs_dir);
884 out_fail_nl80211:
885 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
886 out_fail_notifier:
887 wiphy_sysfs_exit();
888 out_fail_sysfs:
889 unregister_pernet_device(&cfg80211_pernet_ops);
890 out_fail_pernet:
891 return err;
892 }
893 subsys_initcall(cfg80211_init);
894
895 static void cfg80211_exit(void)
896 {
897 debugfs_remove(ieee80211_debugfs_dir);
898 nl80211_exit();
899 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
900 wiphy_sysfs_exit();
901 regulatory_exit();
902 unregister_pernet_device(&cfg80211_pernet_ops);
903 destroy_workqueue(cfg80211_wq);
904 }
905 module_exit(cfg80211_exit);