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Merge branch 'slabh' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc
[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/slab.h>
12 #include <linux/nl80211.h>
13 #include <linux/debugfs.h>
14 #include <linux/notifier.h>
15 #include <linux/device.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/sched.h>
19 #include <net/genetlink.h>
20 #include <net/cfg80211.h>
21 #include "nl80211.h"
22 #include "core.h"
23 #include "sysfs.h"
24 #include "debugfs.h"
25 #include "wext-compat.h"
26 #include "ethtool.h"
27
28 /* name for sysfs, %d is appended */
29 #define PHY_NAME "phy"
30
31 MODULE_AUTHOR("Johannes Berg");
32 MODULE_LICENSE("GPL");
33 MODULE_DESCRIPTION("wireless configuration support");
34
35 /* RCU-protected (and cfg80211_mutex for writers) */
36 LIST_HEAD(cfg80211_rdev_list);
37 int cfg80211_rdev_list_generation;
38
39 DEFINE_MUTEX(cfg80211_mutex);
40
41 /* for debugfs */
42 static struct dentry *ieee80211_debugfs_dir;
43
44 /* for the cleanup, scan and event works */
45 struct workqueue_struct *cfg80211_wq;
46
47 /* requires cfg80211_mutex to be held! */
48 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
49 {
50 struct cfg80211_registered_device *result = NULL, *rdev;
51
52 if (!wiphy_idx_valid(wiphy_idx))
53 return NULL;
54
55 assert_cfg80211_lock();
56
57 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
58 if (rdev->wiphy_idx == wiphy_idx) {
59 result = rdev;
60 break;
61 }
62 }
63
64 return result;
65 }
66
67 int get_wiphy_idx(struct wiphy *wiphy)
68 {
69 struct cfg80211_registered_device *rdev;
70 if (!wiphy)
71 return WIPHY_IDX_STALE;
72 rdev = wiphy_to_dev(wiphy);
73 return rdev->wiphy_idx;
74 }
75
76 /* requires cfg80211_rdev_mutex to be held! */
77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
78 {
79 struct cfg80211_registered_device *rdev;
80
81 if (!wiphy_idx_valid(wiphy_idx))
82 return NULL;
83
84 assert_cfg80211_lock();
85
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
87 if (!rdev)
88 return NULL;
89 return &rdev->wiphy;
90 }
91
92 /* requires cfg80211_mutex to be held! */
93 struct cfg80211_registered_device *
94 __cfg80211_rdev_from_info(struct genl_info *info)
95 {
96 int ifindex;
97 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
98 struct net_device *dev;
99 int err = -EINVAL;
100
101 assert_cfg80211_lock();
102
103 if (info->attrs[NL80211_ATTR_WIPHY]) {
104 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
105 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
106 err = -ENODEV;
107 }
108
109 if (info->attrs[NL80211_ATTR_IFINDEX]) {
110 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
111 dev = dev_get_by_index(genl_info_net(info), ifindex);
112 if (dev) {
113 if (dev->ieee80211_ptr)
114 byifidx =
115 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
116 dev_put(dev);
117 }
118 err = -ENODEV;
119 }
120
121 if (bywiphyidx && byifidx) {
122 if (bywiphyidx != byifidx)
123 return ERR_PTR(-EINVAL);
124 else
125 return bywiphyidx; /* == byifidx */
126 }
127 if (bywiphyidx)
128 return bywiphyidx;
129
130 if (byifidx)
131 return byifidx;
132
133 return ERR_PTR(err);
134 }
135
136 struct cfg80211_registered_device *
137 cfg80211_get_dev_from_info(struct genl_info *info)
138 {
139 struct cfg80211_registered_device *rdev;
140
141 mutex_lock(&cfg80211_mutex);
142 rdev = __cfg80211_rdev_from_info(info);
143
144 /* if it is not an error we grab the lock on
145 * it to assure it won't be going away while
146 * we operate on it */
147 if (!IS_ERR(rdev))
148 mutex_lock(&rdev->mtx);
149
150 mutex_unlock(&cfg80211_mutex);
151
152 return rdev;
153 }
154
155 struct cfg80211_registered_device *
156 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
157 {
158 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
159 struct net_device *dev;
160
161 mutex_lock(&cfg80211_mutex);
162 dev = dev_get_by_index(net, ifindex);
163 if (!dev)
164 goto out;
165 if (dev->ieee80211_ptr) {
166 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
167 mutex_lock(&rdev->mtx);
168 } else
169 rdev = ERR_PTR(-ENODEV);
170 dev_put(dev);
171 out:
172 mutex_unlock(&cfg80211_mutex);
173 return rdev;
174 }
175
176 /* requires cfg80211_mutex to be held */
177 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
178 char *newname)
179 {
180 struct cfg80211_registered_device *rdev2;
181 int wiphy_idx, taken = -1, result, digits;
182
183 assert_cfg80211_lock();
184
185 /* prohibit calling the thing phy%d when %d is not its number */
186 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
187 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
188 /* count number of places needed to print wiphy_idx */
189 digits = 1;
190 while (wiphy_idx /= 10)
191 digits++;
192 /*
193 * deny the name if it is phy<idx> where <idx> is printed
194 * without leading zeroes. taken == strlen(newname) here
195 */
196 if (taken == strlen(PHY_NAME) + digits)
197 return -EINVAL;
198 }
199
200
201 /* Ignore nop renames */
202 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
203 return 0;
204
205 /* Ensure another device does not already have this name. */
206 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
207 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
208 return -EINVAL;
209
210 result = device_rename(&rdev->wiphy.dev, newname);
211 if (result)
212 return result;
213
214 if (rdev->wiphy.debugfsdir &&
215 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
216 rdev->wiphy.debugfsdir,
217 rdev->wiphy.debugfsdir->d_parent,
218 newname))
219 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
220 newname);
221
222 nl80211_notify_dev_rename(rdev);
223
224 return 0;
225 }
226
227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
228 struct net *net)
229 {
230 struct wireless_dev *wdev;
231 int err = 0;
232
233 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
234 return -EOPNOTSUPP;
235
236 list_for_each_entry(wdev, &rdev->netdev_list, list) {
237 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
238 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
239 if (err)
240 break;
241 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
242 }
243
244 if (err) {
245 /* failed -- clean up to old netns */
246 net = wiphy_net(&rdev->wiphy);
247
248 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
249 list) {
250 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
251 err = dev_change_net_namespace(wdev->netdev, net,
252 "wlan%d");
253 WARN_ON(err);
254 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
255 }
256 }
257
258 wiphy_net_set(&rdev->wiphy, net);
259
260 return err;
261 }
262
263 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
264 {
265 struct cfg80211_registered_device *rdev = data;
266
267 rdev->ops->rfkill_poll(&rdev->wiphy);
268 }
269
270 static int cfg80211_rfkill_set_block(void *data, bool blocked)
271 {
272 struct cfg80211_registered_device *rdev = data;
273 struct wireless_dev *wdev;
274
275 if (!blocked)
276 return 0;
277
278 rtnl_lock();
279 mutex_lock(&rdev->devlist_mtx);
280
281 list_for_each_entry(wdev, &rdev->netdev_list, list)
282 dev_close(wdev->netdev);
283
284 mutex_unlock(&rdev->devlist_mtx);
285 rtnl_unlock();
286
287 return 0;
288 }
289
290 static void cfg80211_rfkill_sync_work(struct work_struct *work)
291 {
292 struct cfg80211_registered_device *rdev;
293
294 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
295 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
296 }
297
298 static void cfg80211_event_work(struct work_struct *work)
299 {
300 struct cfg80211_registered_device *rdev;
301
302 rdev = container_of(work, struct cfg80211_registered_device,
303 event_work);
304
305 rtnl_lock();
306 cfg80211_lock_rdev(rdev);
307
308 cfg80211_process_rdev_events(rdev);
309 cfg80211_unlock_rdev(rdev);
310 rtnl_unlock();
311 }
312
313 /* exported functions */
314
315 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
316 {
317 static int wiphy_counter;
318
319 struct cfg80211_registered_device *rdev;
320 int alloc_size;
321
322 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
323 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
324 WARN_ON(ops->connect && !ops->disconnect);
325 WARN_ON(ops->join_ibss && !ops->leave_ibss);
326 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
327 WARN_ON(ops->add_station && !ops->del_station);
328 WARN_ON(ops->add_mpath && !ops->del_mpath);
329
330 alloc_size = sizeof(*rdev) + sizeof_priv;
331
332 rdev = kzalloc(alloc_size, GFP_KERNEL);
333 if (!rdev)
334 return NULL;
335
336 rdev->ops = ops;
337
338 mutex_lock(&cfg80211_mutex);
339
340 rdev->wiphy_idx = wiphy_counter++;
341
342 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
343 wiphy_counter--;
344 mutex_unlock(&cfg80211_mutex);
345 /* ugh, wrapped! */
346 kfree(rdev);
347 return NULL;
348 }
349
350 mutex_unlock(&cfg80211_mutex);
351
352 /* give it a proper name */
353 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
354
355 mutex_init(&rdev->mtx);
356 mutex_init(&rdev->devlist_mtx);
357 INIT_LIST_HEAD(&rdev->netdev_list);
358 spin_lock_init(&rdev->bss_lock);
359 INIT_LIST_HEAD(&rdev->bss_list);
360 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
361
362 #ifdef CONFIG_CFG80211_WEXT
363 rdev->wiphy.wext = &cfg80211_wext_handler;
364 #endif
365
366 device_initialize(&rdev->wiphy.dev);
367 rdev->wiphy.dev.class = &ieee80211_class;
368 rdev->wiphy.dev.platform_data = rdev;
369
370 #ifdef CONFIG_CFG80211_DEFAULT_PS
371 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
372 #endif
373
374 wiphy_net_set(&rdev->wiphy, &init_net);
375
376 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
377 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
378 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
379 &rdev->rfkill_ops, rdev);
380
381 if (!rdev->rfkill) {
382 kfree(rdev);
383 return NULL;
384 }
385
386 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
387 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
388 INIT_WORK(&rdev->event_work, cfg80211_event_work);
389
390 init_waitqueue_head(&rdev->dev_wait);
391
392 /*
393 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
394 * Fragmentation and RTS threshold are disabled by default with the
395 * special -1 value.
396 */
397 rdev->wiphy.retry_short = 7;
398 rdev->wiphy.retry_long = 4;
399 rdev->wiphy.frag_threshold = (u32) -1;
400 rdev->wiphy.rts_threshold = (u32) -1;
401 rdev->wiphy.coverage_class = 0;
402
403 return &rdev->wiphy;
404 }
405 EXPORT_SYMBOL(wiphy_new);
406
407 int wiphy_register(struct wiphy *wiphy)
408 {
409 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
410 int res;
411 enum ieee80211_band band;
412 struct ieee80211_supported_band *sband;
413 bool have_band = false;
414 int i;
415 u16 ifmodes = wiphy->interface_modes;
416
417 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
418 return -EINVAL;
419
420 if (WARN_ON(wiphy->addresses &&
421 !is_zero_ether_addr(wiphy->perm_addr) &&
422 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
423 ETH_ALEN)))
424 return -EINVAL;
425
426 if (wiphy->addresses)
427 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
428
429 /* sanity check ifmodes */
430 WARN_ON(!ifmodes);
431 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
432 if (WARN_ON(ifmodes != wiphy->interface_modes))
433 wiphy->interface_modes = ifmodes;
434
435 /* sanity check supported bands/channels */
436 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
437 sband = wiphy->bands[band];
438 if (!sband)
439 continue;
440
441 sband->band = band;
442
443 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
444 return -EINVAL;
445
446 /*
447 * Since we use a u32 for rate bitmaps in
448 * ieee80211_get_response_rate, we cannot
449 * have more than 32 legacy rates.
450 */
451 if (WARN_ON(sband->n_bitrates > 32))
452 return -EINVAL;
453
454 for (i = 0; i < sband->n_channels; i++) {
455 sband->channels[i].orig_flags =
456 sband->channels[i].flags;
457 sband->channels[i].orig_mag =
458 sband->channels[i].max_antenna_gain;
459 sband->channels[i].orig_mpwr =
460 sband->channels[i].max_power;
461 sband->channels[i].band = band;
462 }
463
464 have_band = true;
465 }
466
467 if (!have_band) {
468 WARN_ON(1);
469 return -EINVAL;
470 }
471
472 /* check and set up bitrates */
473 ieee80211_set_bitrate_flags(wiphy);
474
475 res = device_add(&rdev->wiphy.dev);
476 if (res)
477 return res;
478
479 res = rfkill_register(rdev->rfkill);
480 if (res)
481 goto out_rm_dev;
482
483 mutex_lock(&cfg80211_mutex);
484
485 /* set up regulatory info */
486 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
487
488 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
489 cfg80211_rdev_list_generation++;
490
491 mutex_unlock(&cfg80211_mutex);
492
493 /* add to debugfs */
494 rdev->wiphy.debugfsdir =
495 debugfs_create_dir(wiphy_name(&rdev->wiphy),
496 ieee80211_debugfs_dir);
497 if (IS_ERR(rdev->wiphy.debugfsdir))
498 rdev->wiphy.debugfsdir = NULL;
499
500 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
501 struct regulatory_request request;
502
503 request.wiphy_idx = get_wiphy_idx(wiphy);
504 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
505 request.alpha2[0] = '9';
506 request.alpha2[1] = '9';
507
508 nl80211_send_reg_change_event(&request);
509 }
510
511 cfg80211_debugfs_rdev_add(rdev);
512
513 return 0;
514
515 out_rm_dev:
516 device_del(&rdev->wiphy.dev);
517 return res;
518 }
519 EXPORT_SYMBOL(wiphy_register);
520
521 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
522 {
523 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
524
525 if (!rdev->ops->rfkill_poll)
526 return;
527 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
528 rfkill_resume_polling(rdev->rfkill);
529 }
530 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
531
532 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
533 {
534 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
535
536 rfkill_pause_polling(rdev->rfkill);
537 }
538 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
539
540 void wiphy_unregister(struct wiphy *wiphy)
541 {
542 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
543
544 rfkill_unregister(rdev->rfkill);
545
546 /* protect the device list */
547 mutex_lock(&cfg80211_mutex);
548
549 wait_event(rdev->dev_wait, ({
550 int __count;
551 mutex_lock(&rdev->devlist_mtx);
552 __count = rdev->opencount;
553 mutex_unlock(&rdev->devlist_mtx);
554 __count == 0;}));
555
556 mutex_lock(&rdev->devlist_mtx);
557 BUG_ON(!list_empty(&rdev->netdev_list));
558 mutex_unlock(&rdev->devlist_mtx);
559
560 /*
561 * First remove the hardware from everywhere, this makes
562 * it impossible to find from userspace.
563 */
564 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
565 list_del_rcu(&rdev->list);
566 synchronize_rcu();
567
568 /*
569 * Try to grab rdev->mtx. If a command is still in progress,
570 * hopefully the driver will refuse it since it's tearing
571 * down the device already. We wait for this command to complete
572 * before unlinking the item from the list.
573 * Note: as codified by the BUG_ON above we cannot get here if
574 * a virtual interface is still present. Hence, we can only get
575 * to lock contention here if userspace issues a command that
576 * identified the hardware by wiphy index.
577 */
578 cfg80211_lock_rdev(rdev);
579 /* nothing */
580 cfg80211_unlock_rdev(rdev);
581
582 /* If this device got a regulatory hint tell core its
583 * free to listen now to a new shiny device regulatory hint */
584 reg_device_remove(wiphy);
585
586 cfg80211_rdev_list_generation++;
587 device_del(&rdev->wiphy.dev);
588
589 mutex_unlock(&cfg80211_mutex);
590
591 flush_work(&rdev->scan_done_wk);
592 cancel_work_sync(&rdev->conn_work);
593 flush_work(&rdev->event_work);
594 }
595 EXPORT_SYMBOL(wiphy_unregister);
596
597 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
598 {
599 struct cfg80211_internal_bss *scan, *tmp;
600 rfkill_destroy(rdev->rfkill);
601 mutex_destroy(&rdev->mtx);
602 mutex_destroy(&rdev->devlist_mtx);
603 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
604 cfg80211_put_bss(&scan->pub);
605 kfree(rdev);
606 }
607
608 void wiphy_free(struct wiphy *wiphy)
609 {
610 put_device(&wiphy->dev);
611 }
612 EXPORT_SYMBOL(wiphy_free);
613
614 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
615 {
616 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
617
618 if (rfkill_set_hw_state(rdev->rfkill, blocked))
619 schedule_work(&rdev->rfkill_sync);
620 }
621 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
622
623 static void wdev_cleanup_work(struct work_struct *work)
624 {
625 struct wireless_dev *wdev;
626 struct cfg80211_registered_device *rdev;
627
628 wdev = container_of(work, struct wireless_dev, cleanup_work);
629 rdev = wiphy_to_dev(wdev->wiphy);
630
631 cfg80211_lock_rdev(rdev);
632
633 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
634 rdev->scan_req->aborted = true;
635 ___cfg80211_scan_done(rdev, true);
636 }
637
638 cfg80211_unlock_rdev(rdev);
639
640 mutex_lock(&rdev->devlist_mtx);
641 rdev->opencount--;
642 mutex_unlock(&rdev->devlist_mtx);
643 wake_up(&rdev->dev_wait);
644
645 dev_put(wdev->netdev);
646 }
647
648 static struct device_type wiphy_type = {
649 .name = "wlan",
650 };
651
652 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
653 unsigned long state,
654 void *ndev)
655 {
656 struct net_device *dev = ndev;
657 struct wireless_dev *wdev = dev->ieee80211_ptr;
658 struct cfg80211_registered_device *rdev;
659
660 if (!wdev)
661 return NOTIFY_DONE;
662
663 rdev = wiphy_to_dev(wdev->wiphy);
664
665 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
666
667 switch (state) {
668 case NETDEV_POST_INIT:
669 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
670 break;
671 case NETDEV_REGISTER:
672 /*
673 * NB: cannot take rdev->mtx here because this may be
674 * called within code protected by it when interfaces
675 * are added with nl80211.
676 */
677 mutex_init(&wdev->mtx);
678 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
679 INIT_LIST_HEAD(&wdev->event_list);
680 spin_lock_init(&wdev->event_lock);
681 INIT_LIST_HEAD(&wdev->action_registrations);
682 spin_lock_init(&wdev->action_registrations_lock);
683
684 mutex_lock(&rdev->devlist_mtx);
685 list_add_rcu(&wdev->list, &rdev->netdev_list);
686 rdev->devlist_generation++;
687 /* can only change netns with wiphy */
688 dev->features |= NETIF_F_NETNS_LOCAL;
689
690 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
691 "phy80211")) {
692 printk(KERN_ERR "wireless: failed to add phy80211 "
693 "symlink to netdev!\n");
694 }
695 wdev->netdev = dev;
696 wdev->sme_state = CFG80211_SME_IDLE;
697 mutex_unlock(&rdev->devlist_mtx);
698 #ifdef CONFIG_CFG80211_WEXT
699 wdev->wext.default_key = -1;
700 wdev->wext.default_mgmt_key = -1;
701 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
702 #endif
703
704 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
705 wdev->ps = true;
706 else
707 wdev->ps = false;
708 wdev->ps_timeout = 100;
709 if (rdev->ops->set_power_mgmt)
710 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
711 wdev->ps,
712 wdev->ps_timeout)) {
713 /* assume this means it's off */
714 wdev->ps = false;
715 }
716
717 if (!dev->ethtool_ops)
718 dev->ethtool_ops = &cfg80211_ethtool_ops;
719
720 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
721 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
722 dev->priv_flags |= IFF_DONT_BRIDGE;
723 break;
724 case NETDEV_GOING_DOWN:
725 switch (wdev->iftype) {
726 case NL80211_IFTYPE_ADHOC:
727 cfg80211_leave_ibss(rdev, dev, true);
728 break;
729 case NL80211_IFTYPE_STATION:
730 wdev_lock(wdev);
731 #ifdef CONFIG_CFG80211_WEXT
732 kfree(wdev->wext.ie);
733 wdev->wext.ie = NULL;
734 wdev->wext.ie_len = 0;
735 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
736 #endif
737 __cfg80211_disconnect(rdev, dev,
738 WLAN_REASON_DEAUTH_LEAVING, true);
739 cfg80211_mlme_down(rdev, dev);
740 wdev_unlock(wdev);
741 break;
742 default:
743 break;
744 }
745 break;
746 case NETDEV_DOWN:
747 dev_hold(dev);
748 queue_work(cfg80211_wq, &wdev->cleanup_work);
749 break;
750 case NETDEV_UP:
751 /*
752 * If we have a really quick DOWN/UP succession we may
753 * have this work still pending ... cancel it and see
754 * if it was pending, in which case we need to account
755 * for some of the work it would have done.
756 */
757 if (cancel_work_sync(&wdev->cleanup_work)) {
758 mutex_lock(&rdev->devlist_mtx);
759 rdev->opencount--;
760 mutex_unlock(&rdev->devlist_mtx);
761 dev_put(dev);
762 }
763 cfg80211_lock_rdev(rdev);
764 mutex_lock(&rdev->devlist_mtx);
765 #ifdef CONFIG_CFG80211_WEXT
766 wdev_lock(wdev);
767 switch (wdev->iftype) {
768 case NL80211_IFTYPE_ADHOC:
769 cfg80211_ibss_wext_join(rdev, wdev);
770 break;
771 case NL80211_IFTYPE_STATION:
772 cfg80211_mgd_wext_connect(rdev, wdev);
773 break;
774 default:
775 break;
776 }
777 wdev_unlock(wdev);
778 #endif
779 rdev->opencount++;
780 mutex_unlock(&rdev->devlist_mtx);
781 cfg80211_unlock_rdev(rdev);
782 break;
783 case NETDEV_UNREGISTER:
784 /*
785 * NB: cannot take rdev->mtx here because this may be
786 * called within code protected by it when interfaces
787 * are removed with nl80211.
788 */
789 mutex_lock(&rdev->devlist_mtx);
790 /*
791 * It is possible to get NETDEV_UNREGISTER
792 * multiple times. To detect that, check
793 * that the interface is still on the list
794 * of registered interfaces, and only then
795 * remove and clean it up.
796 */
797 if (!list_empty(&wdev->list)) {
798 sysfs_remove_link(&dev->dev.kobj, "phy80211");
799 list_del_rcu(&wdev->list);
800 rdev->devlist_generation++;
801 cfg80211_mlme_purge_actions(wdev);
802 #ifdef CONFIG_CFG80211_WEXT
803 kfree(wdev->wext.keys);
804 #endif
805 }
806 mutex_unlock(&rdev->devlist_mtx);
807 /*
808 * synchronise (so that we won't find this netdev
809 * from other code any more) and then clear the list
810 * head so that the above code can safely check for
811 * !list_empty() to avoid double-cleanup.
812 */
813 synchronize_rcu();
814 INIT_LIST_HEAD(&wdev->list);
815 break;
816 case NETDEV_PRE_UP:
817 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
818 return notifier_from_errno(-EOPNOTSUPP);
819 if (rfkill_blocked(rdev->rfkill))
820 return notifier_from_errno(-ERFKILL);
821 break;
822 }
823
824 return NOTIFY_DONE;
825 }
826
827 static struct notifier_block cfg80211_netdev_notifier = {
828 .notifier_call = cfg80211_netdev_notifier_call,
829 };
830
831 static void __net_exit cfg80211_pernet_exit(struct net *net)
832 {
833 struct cfg80211_registered_device *rdev;
834
835 rtnl_lock();
836 mutex_lock(&cfg80211_mutex);
837 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
838 if (net_eq(wiphy_net(&rdev->wiphy), net))
839 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
840 }
841 mutex_unlock(&cfg80211_mutex);
842 rtnl_unlock();
843 }
844
845 static struct pernet_operations cfg80211_pernet_ops = {
846 .exit = cfg80211_pernet_exit,
847 };
848
849 static int __init cfg80211_init(void)
850 {
851 int err;
852
853 err = register_pernet_device(&cfg80211_pernet_ops);
854 if (err)
855 goto out_fail_pernet;
856
857 err = wiphy_sysfs_init();
858 if (err)
859 goto out_fail_sysfs;
860
861 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
862 if (err)
863 goto out_fail_notifier;
864
865 err = nl80211_init();
866 if (err)
867 goto out_fail_nl80211;
868
869 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
870
871 err = regulatory_init();
872 if (err)
873 goto out_fail_reg;
874
875 cfg80211_wq = create_singlethread_workqueue("cfg80211");
876 if (!cfg80211_wq)
877 goto out_fail_wq;
878
879 return 0;
880
881 out_fail_wq:
882 regulatory_exit();
883 out_fail_reg:
884 debugfs_remove(ieee80211_debugfs_dir);
885 out_fail_nl80211:
886 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
887 out_fail_notifier:
888 wiphy_sysfs_exit();
889 out_fail_sysfs:
890 unregister_pernet_device(&cfg80211_pernet_ops);
891 out_fail_pernet:
892 return err;
893 }
894 subsys_initcall(cfg80211_init);
895
896 static void cfg80211_exit(void)
897 {
898 debugfs_remove(ieee80211_debugfs_dir);
899 nl80211_exit();
900 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
901 wiphy_sysfs_exit();
902 regulatory_exit();
903 unregister_pernet_device(&cfg80211_pernet_ops);
904 destroy_workqueue(cfg80211_wq);
905 }
906 module_exit(cfg80211_exit);