1 /*
2 * This is the linux wireless configuration interface.
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/if.h>
10 #include <linux/module.h>
11 #include <linux/err.h>
12 #include <linux/list.h>
13 #include <linux/slab.h>
14 #include <linux/nl80211.h>
15 #include <linux/debugfs.h>
16 #include <linux/notifier.h>
17 #include <linux/device.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/sched.h>
21 #include <net/genetlink.h>
22 #include <net/cfg80211.h>
23 #include "nl80211.h"
24 #include "core.h"
25 #include "sysfs.h"
26 #include "debugfs.h"
27 #include "wext-compat.h"
28 #include "ethtool.h"
29
30 /* name for sysfs, %d is appended */
31 #define PHY_NAME "phy"
32
33 MODULE_AUTHOR("Johannes Berg");
34 MODULE_LICENSE("GPL");
35 MODULE_DESCRIPTION("wireless configuration support");
36
37 /* RCU-protected (and cfg80211_mutex for writers) */
38 LIST_HEAD(cfg80211_rdev_list);
39 int cfg80211_rdev_list_generation;
40
41 DEFINE_MUTEX(cfg80211_mutex);
42
43 /* for debugfs */
44 static struct dentry *ieee80211_debugfs_dir;
45
46 /* for the cleanup, scan and event works */
47 struct workqueue_struct *cfg80211_wq;
48
49 /* requires cfg80211_mutex to be held! */
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)50 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
51 {
52 struct cfg80211_registered_device *result = NULL, *rdev;
53
54 if (!wiphy_idx_valid(wiphy_idx))
55 return NULL;
56
57 assert_cfg80211_lock();
58
59 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
60 if (rdev->wiphy_idx == wiphy_idx) {
61 result = rdev;
62 break;
63 }
64 }
65
66 return result;
67 }
68
get_wiphy_idx(struct wiphy * wiphy)69 int get_wiphy_idx(struct wiphy *wiphy)
70 {
71 struct cfg80211_registered_device *rdev;
72 if (!wiphy)
73 return WIPHY_IDX_STALE;
74 rdev = wiphy_to_dev(wiphy);
75 return rdev->wiphy_idx;
76 }
77
78 /* requires cfg80211_rdev_mutex to be held! */
wiphy_idx_to_wiphy(int wiphy_idx)79 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
80 {
81 struct cfg80211_registered_device *rdev;
82
83 if (!wiphy_idx_valid(wiphy_idx))
84 return NULL;
85
86 assert_cfg80211_lock();
87
88 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
89 if (!rdev)
90 return NULL;
91 return &rdev->wiphy;
92 }
93
94 /* requires cfg80211_mutex to be held! */
95 struct cfg80211_registered_device *
__cfg80211_rdev_from_info(struct genl_info * info)96 __cfg80211_rdev_from_info(struct genl_info *info)
97 {
98 int ifindex;
99 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
100 struct net_device *dev;
101 int err = -EINVAL;
102
103 assert_cfg80211_lock();
104
105 if (info->attrs[NL80211_ATTR_WIPHY]) {
106 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
107 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
108 err = -ENODEV;
109 }
110
111 if (info->attrs[NL80211_ATTR_IFINDEX]) {
112 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
113 dev = dev_get_by_index(genl_info_net(info), ifindex);
114 if (dev) {
115 if (dev->ieee80211_ptr)
116 byifidx =
117 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
118 dev_put(dev);
119 }
120 err = -ENODEV;
121 }
122
123 if (bywiphyidx && byifidx) {
124 if (bywiphyidx != byifidx)
125 return ERR_PTR(-EINVAL);
126 else
127 return bywiphyidx; /* == byifidx */
128 }
129 if (bywiphyidx)
130 return bywiphyidx;
131
132 if (byifidx)
133 return byifidx;
134
135 return ERR_PTR(err);
136 }
137
138 struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info * info)139 cfg80211_get_dev_from_info(struct genl_info *info)
140 {
141 struct cfg80211_registered_device *rdev;
142
143 mutex_lock(&cfg80211_mutex);
144 rdev = __cfg80211_rdev_from_info(info);
145
146 /* if it is not an error we grab the lock on
147 * it to assure it won't be going away while
148 * we operate on it */
149 if (!IS_ERR(rdev))
150 mutex_lock(&rdev->mtx);
151
152 mutex_unlock(&cfg80211_mutex);
153
154 return rdev;
155 }
156
157 struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(struct net * net,int ifindex)158 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
159 {
160 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
161 struct net_device *dev;
162
163 mutex_lock(&cfg80211_mutex);
164 dev = dev_get_by_index(net, ifindex);
165 if (!dev)
166 goto out;
167 if (dev->ieee80211_ptr) {
168 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
169 mutex_lock(&rdev->mtx);
170 } else
171 rdev = ERR_PTR(-ENODEV);
172 dev_put(dev);
173 out:
174 mutex_unlock(&cfg80211_mutex);
175 return rdev;
176 }
177
178 /* requires cfg80211_mutex to be held */
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)179 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
180 char *newname)
181 {
182 struct cfg80211_registered_device *rdev2;
183 int wiphy_idx, taken = -1, result, digits;
184
185 assert_cfg80211_lock();
186
187 /* prohibit calling the thing phy%d when %d is not its number */
188 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
189 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
190 /* count number of places needed to print wiphy_idx */
191 digits = 1;
192 while (wiphy_idx /= 10)
193 digits++;
194 /*
195 * deny the name if it is phy<idx> where <idx> is printed
196 * without leading zeroes. taken == strlen(newname) here
197 */
198 if (taken == strlen(PHY_NAME) + digits)
199 return -EINVAL;
200 }
201
202
203 /* Ignore nop renames */
204 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
205 return 0;
206
207 /* Ensure another device does not already have this name. */
208 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
209 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
210 return -EINVAL;
211
212 result = device_rename(&rdev->wiphy.dev, newname);
213 if (result)
214 return result;
215
216 if (rdev->wiphy.debugfsdir &&
217 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
218 rdev->wiphy.debugfsdir,
219 rdev->wiphy.debugfsdir->d_parent,
220 newname))
221 pr_err("failed to rename debugfs dir to %s!\n", newname);
222
223 nl80211_notify_dev_rename(rdev);
224
225 return 0;
226 }
227
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)228 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
229 struct net *net)
230 {
231 struct wireless_dev *wdev;
232 int err = 0;
233
234 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
235 return -EOPNOTSUPP;
236
237 list_for_each_entry(wdev, &rdev->netdev_list, list) {
238 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
239 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
240 if (err)
241 break;
242 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
243 }
244
245 if (err) {
246 /* failed -- clean up to old netns */
247 net = wiphy_net(&rdev->wiphy);
248
249 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
250 list) {
251 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
252 err = dev_change_net_namespace(wdev->netdev, net,
253 "wlan%d");
254 WARN_ON(err);
255 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
256 }
257
258 return err;
259 }
260
261 wiphy_net_set(&rdev->wiphy, net);
262
263 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
264 WARN_ON(err);
265
266 return 0;
267 }
268
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)269 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
270 {
271 struct cfg80211_registered_device *rdev = data;
272
273 rdev->ops->rfkill_poll(&rdev->wiphy);
274 }
275
cfg80211_rfkill_set_block(void * data,bool blocked)276 static int cfg80211_rfkill_set_block(void *data, bool blocked)
277 {
278 struct cfg80211_registered_device *rdev = data;
279 struct wireless_dev *wdev;
280
281 if (!blocked)
282 return 0;
283
284 rtnl_lock();
285 mutex_lock(&rdev->devlist_mtx);
286
287 list_for_each_entry(wdev, &rdev->netdev_list, list)
288 dev_close(wdev->netdev);
289
290 mutex_unlock(&rdev->devlist_mtx);
291 rtnl_unlock();
292
293 return 0;
294 }
295
cfg80211_rfkill_sync_work(struct work_struct * work)296 static void cfg80211_rfkill_sync_work(struct work_struct *work)
297 {
298 struct cfg80211_registered_device *rdev;
299
300 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
301 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
302 }
303
cfg80211_event_work(struct work_struct * work)304 static void cfg80211_event_work(struct work_struct *work)
305 {
306 struct cfg80211_registered_device *rdev;
307
308 rdev = container_of(work, struct cfg80211_registered_device,
309 event_work);
310
311 rtnl_lock();
312 cfg80211_lock_rdev(rdev);
313
314 cfg80211_process_rdev_events(rdev);
315 cfg80211_unlock_rdev(rdev);
316 rtnl_unlock();
317 }
318
319 /* exported functions */
320
wiphy_new(const struct cfg80211_ops * ops,int sizeof_priv)321 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
322 {
323 static int wiphy_counter;
324
325 struct cfg80211_registered_device *rdev;
326 int alloc_size;
327
328 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
329 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
330 WARN_ON(ops->connect && !ops->disconnect);
331 WARN_ON(ops->join_ibss && !ops->leave_ibss);
332 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
333 WARN_ON(ops->add_station && !ops->del_station);
334 WARN_ON(ops->add_mpath && !ops->del_mpath);
335 WARN_ON(ops->join_mesh && !ops->leave_mesh);
336
337 alloc_size = sizeof(*rdev) + sizeof_priv;
338
339 rdev = kzalloc(alloc_size, GFP_KERNEL);
340 if (!rdev)
341 return NULL;
342
343 rdev->ops = ops;
344
345 mutex_lock(&cfg80211_mutex);
346
347 rdev->wiphy_idx = wiphy_counter++;
348
349 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
350 wiphy_counter--;
351 mutex_unlock(&cfg80211_mutex);
352 /* ugh, wrapped! */
353 kfree(rdev);
354 return NULL;
355 }
356
357 mutex_unlock(&cfg80211_mutex);
358
359 /* give it a proper name */
360 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
361
362 mutex_init(&rdev->mtx);
363 mutex_init(&rdev->devlist_mtx);
364 INIT_LIST_HEAD(&rdev->netdev_list);
365 spin_lock_init(&rdev->bss_lock);
366 INIT_LIST_HEAD(&rdev->bss_list);
367 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
368
369 #ifdef CONFIG_CFG80211_WEXT
370 rdev->wiphy.wext = &cfg80211_wext_handler;
371 #endif
372
373 device_initialize(&rdev->wiphy.dev);
374 rdev->wiphy.dev.class = &ieee80211_class;
375 rdev->wiphy.dev.platform_data = rdev;
376
377 #ifdef CONFIG_CFG80211_DEFAULT_PS
378 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
379 #endif
380
381 wiphy_net_set(&rdev->wiphy, &init_net);
382
383 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
384 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
385 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
386 &rdev->rfkill_ops, rdev);
387
388 if (!rdev->rfkill) {
389 kfree(rdev);
390 return NULL;
391 }
392
393 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
394 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
395 INIT_WORK(&rdev->event_work, cfg80211_event_work);
396
397 init_waitqueue_head(&rdev->dev_wait);
398
399 /*
400 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
401 * Fragmentation and RTS threshold are disabled by default with the
402 * special -1 value.
403 */
404 rdev->wiphy.retry_short = 7;
405 rdev->wiphy.retry_long = 4;
406 rdev->wiphy.frag_threshold = (u32) -1;
407 rdev->wiphy.rts_threshold = (u32) -1;
408 rdev->wiphy.coverage_class = 0;
409
410 return &rdev->wiphy;
411 }
412 EXPORT_SYMBOL(wiphy_new);
413
wiphy_register(struct wiphy * wiphy)414 int wiphy_register(struct wiphy *wiphy)
415 {
416 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
417 int res;
418 enum ieee80211_band band;
419 struct ieee80211_supported_band *sband;
420 bool have_band = false;
421 int i;
422 u16 ifmodes = wiphy->interface_modes;
423
424 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
425 return -EINVAL;
426
427 if (WARN_ON(wiphy->addresses &&
428 !is_zero_ether_addr(wiphy->perm_addr) &&
429 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
430 ETH_ALEN)))
431 return -EINVAL;
432
433 if (wiphy->addresses)
434 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
435
436 /* sanity check ifmodes */
437 WARN_ON(!ifmodes);
438 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
439 if (WARN_ON(ifmodes != wiphy->interface_modes))
440 wiphy->interface_modes = ifmodes;
441
442 /* sanity check supported bands/channels */
443 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
444 sband = wiphy->bands[band];
445 if (!sband)
446 continue;
447
448 sband->band = band;
449
450 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
451 return -EINVAL;
452
453 /*
454 * Since we use a u32 for rate bitmaps in
455 * ieee80211_get_response_rate, we cannot
456 * have more than 32 legacy rates.
457 */
458 if (WARN_ON(sband->n_bitrates > 32))
459 return -EINVAL;
460
461 for (i = 0; i < sband->n_channels; i++) {
462 sband->channels[i].orig_flags =
463 sband->channels[i].flags;
464 sband->channels[i].orig_mag =
465 sband->channels[i].max_antenna_gain;
466 sband->channels[i].orig_mpwr =
467 sband->channels[i].max_power;
468 sband->channels[i].band = band;
469 }
470
471 have_band = true;
472 }
473
474 if (!have_band) {
475 WARN_ON(1);
476 return -EINVAL;
477 }
478
479 /* check and set up bitrates */
480 ieee80211_set_bitrate_flags(wiphy);
481
482 mutex_lock(&cfg80211_mutex);
483
484 res = device_add(&rdev->wiphy.dev);
485 if (res) {
486 mutex_unlock(&cfg80211_mutex);
487 return res;
488 }
489
490 /* set up regulatory info */
491 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
492
493 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
494 cfg80211_rdev_list_generation++;
495
496 /* add to debugfs */
497 rdev->wiphy.debugfsdir =
498 debugfs_create_dir(wiphy_name(&rdev->wiphy),
499 ieee80211_debugfs_dir);
500 if (IS_ERR(rdev->wiphy.debugfsdir))
501 rdev->wiphy.debugfsdir = NULL;
502
503 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
504 struct regulatory_request request;
505
506 request.wiphy_idx = get_wiphy_idx(wiphy);
507 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
508 request.alpha2[0] = '9';
509 request.alpha2[1] = '9';
510
511 nl80211_send_reg_change_event(&request);
512 }
513
514 cfg80211_debugfs_rdev_add(rdev);
515 mutex_unlock(&cfg80211_mutex);
516
517 /*
518 * due to a locking dependency this has to be outside of the
519 * cfg80211_mutex lock
520 */
521 res = rfkill_register(rdev->rfkill);
522 if (res)
523 goto out_rm_dev;
524
525 return 0;
526
527 out_rm_dev:
528 device_del(&rdev->wiphy.dev);
529 return res;
530 }
531 EXPORT_SYMBOL(wiphy_register);
532
wiphy_rfkill_start_polling(struct wiphy * wiphy)533 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
534 {
535 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
536
537 if (!rdev->ops->rfkill_poll)
538 return;
539 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
540 rfkill_resume_polling(rdev->rfkill);
541 }
542 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
543
wiphy_rfkill_stop_polling(struct wiphy * wiphy)544 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
545 {
546 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
547
548 rfkill_pause_polling(rdev->rfkill);
549 }
550 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
551
wiphy_unregister(struct wiphy * wiphy)552 void wiphy_unregister(struct wiphy *wiphy)
553 {
554 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
555
556 rfkill_unregister(rdev->rfkill);
557
558 /* protect the device list */
559 mutex_lock(&cfg80211_mutex);
560
561 wait_event(rdev->dev_wait, ({
562 int __count;
563 mutex_lock(&rdev->devlist_mtx);
564 __count = rdev->opencount;
565 mutex_unlock(&rdev->devlist_mtx);
566 __count == 0;}));
567
568 mutex_lock(&rdev->devlist_mtx);
569 BUG_ON(!list_empty(&rdev->netdev_list));
570 mutex_unlock(&rdev->devlist_mtx);
571
572 /*
573 * First remove the hardware from everywhere, this makes
574 * it impossible to find from userspace.
575 */
576 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
577 list_del_rcu(&rdev->list);
578 synchronize_rcu();
579
580 /*
581 * Try to grab rdev->mtx. If a command is still in progress,
582 * hopefully the driver will refuse it since it's tearing
583 * down the device already. We wait for this command to complete
584 * before unlinking the item from the list.
585 * Note: as codified by the BUG_ON above we cannot get here if
586 * a virtual interface is still present. Hence, we can only get
587 * to lock contention here if userspace issues a command that
588 * identified the hardware by wiphy index.
589 */
590 cfg80211_lock_rdev(rdev);
591 /* nothing */
592 cfg80211_unlock_rdev(rdev);
593
594 /* If this device got a regulatory hint tell core its
595 * free to listen now to a new shiny device regulatory hint */
596 reg_device_remove(wiphy);
597
598 cfg80211_rdev_list_generation++;
599 device_del(&rdev->wiphy.dev);
600
601 mutex_unlock(&cfg80211_mutex);
602
603 flush_work(&rdev->scan_done_wk);
604 cancel_work_sync(&rdev->conn_work);
605 flush_work(&rdev->event_work);
606 }
607 EXPORT_SYMBOL(wiphy_unregister);
608
cfg80211_dev_free(struct cfg80211_registered_device * rdev)609 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
610 {
611 struct cfg80211_internal_bss *scan, *tmp;
612 rfkill_destroy(rdev->rfkill);
613 mutex_destroy(&rdev->mtx);
614 mutex_destroy(&rdev->devlist_mtx);
615 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
616 cfg80211_put_bss(&scan->pub);
617 kfree(rdev);
618 }
619
wiphy_free(struct wiphy * wiphy)620 void wiphy_free(struct wiphy *wiphy)
621 {
622 put_device(&wiphy->dev);
623 }
624 EXPORT_SYMBOL(wiphy_free);
625
wiphy_rfkill_set_hw_state(struct wiphy * wiphy,bool blocked)626 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
627 {
628 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
629
630 if (rfkill_set_hw_state(rdev->rfkill, blocked))
631 schedule_work(&rdev->rfkill_sync);
632 }
633 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
634
wdev_cleanup_work(struct work_struct * work)635 static void wdev_cleanup_work(struct work_struct *work)
636 {
637 struct wireless_dev *wdev;
638 struct cfg80211_registered_device *rdev;
639
640 wdev = container_of(work, struct wireless_dev, cleanup_work);
641 rdev = wiphy_to_dev(wdev->wiphy);
642
643 cfg80211_lock_rdev(rdev);
644
645 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
646 rdev->scan_req->aborted = true;
647 ___cfg80211_scan_done(rdev, true);
648 }
649
650 cfg80211_unlock_rdev(rdev);
651
652 mutex_lock(&rdev->devlist_mtx);
653 rdev->opencount--;
654 mutex_unlock(&rdev->devlist_mtx);
655 wake_up(&rdev->dev_wait);
656
657 dev_put(wdev->netdev);
658 }
659
660 static struct device_type wiphy_type = {
661 .name = "wlan",
662 };
663
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ndev)664 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
665 unsigned long state,
666 void *ndev)
667 {
668 struct net_device *dev = ndev;
669 struct wireless_dev *wdev = dev->ieee80211_ptr;
670 struct cfg80211_registered_device *rdev;
671
672 if (!wdev)
673 return NOTIFY_DONE;
674
675 rdev = wiphy_to_dev(wdev->wiphy);
676
677 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
678
679 switch (state) {
680 case NETDEV_POST_INIT:
681 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
682 break;
683 case NETDEV_REGISTER:
684 /*
685 * NB: cannot take rdev->mtx here because this may be
686 * called within code protected by it when interfaces
687 * are added with nl80211.
688 */
689 mutex_init(&wdev->mtx);
690 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
691 INIT_LIST_HEAD(&wdev->event_list);
692 spin_lock_init(&wdev->event_lock);
693 INIT_LIST_HEAD(&wdev->mgmt_registrations);
694 spin_lock_init(&wdev->mgmt_registrations_lock);
695
696 mutex_lock(&rdev->devlist_mtx);
697 list_add_rcu(&wdev->list, &rdev->netdev_list);
698 rdev->devlist_generation++;
699 /* can only change netns with wiphy */
700 dev->features |= NETIF_F_NETNS_LOCAL;
701
702 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
703 "phy80211")) {
704 pr_err("failed to add phy80211 symlink to netdev!\n");
705 }
706 wdev->netdev = dev;
707 wdev->sme_state = CFG80211_SME_IDLE;
708 mutex_unlock(&rdev->devlist_mtx);
709 #ifdef CONFIG_CFG80211_WEXT
710 wdev->wext.default_key = -1;
711 wdev->wext.default_mgmt_key = -1;
712 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
713 #endif
714
715 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
716 wdev->ps = true;
717 else
718 wdev->ps = false;
719 /* allow mac80211 to determine the timeout */
720 wdev->ps_timeout = -1;
721
722 if (!dev->ethtool_ops)
723 dev->ethtool_ops = &cfg80211_ethtool_ops;
724
725 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
726 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
727 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
728 dev->priv_flags |= IFF_DONT_BRIDGE;
729 break;
730 case NETDEV_GOING_DOWN:
731 switch (wdev->iftype) {
732 case NL80211_IFTYPE_ADHOC:
733 cfg80211_leave_ibss(rdev, dev, true);
734 break;
735 case NL80211_IFTYPE_P2P_CLIENT:
736 case NL80211_IFTYPE_STATION:
737 wdev_lock(wdev);
738 #ifdef CONFIG_CFG80211_WEXT
739 kfree(wdev->wext.ie);
740 wdev->wext.ie = NULL;
741 wdev->wext.ie_len = 0;
742 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
743 #endif
744 __cfg80211_disconnect(rdev, dev,
745 WLAN_REASON_DEAUTH_LEAVING, true);
746 cfg80211_mlme_down(rdev, dev);
747 wdev_unlock(wdev);
748 break;
749 case NL80211_IFTYPE_MESH_POINT:
750 cfg80211_leave_mesh(rdev, dev);
751 break;
752 default:
753 break;
754 }
755 break;
756 case NETDEV_DOWN:
757 dev_hold(dev);
758 queue_work(cfg80211_wq, &wdev->cleanup_work);
759 break;
760 case NETDEV_UP:
761 /*
762 * If we have a really quick DOWN/UP succession we may
763 * have this work still pending ... cancel it and see
764 * if it was pending, in which case we need to account
765 * for some of the work it would have done.
766 */
767 if (cancel_work_sync(&wdev->cleanup_work)) {
768 mutex_lock(&rdev->devlist_mtx);
769 rdev->opencount--;
770 mutex_unlock(&rdev->devlist_mtx);
771 dev_put(dev);
772 }
773 cfg80211_lock_rdev(rdev);
774 mutex_lock(&rdev->devlist_mtx);
775 wdev_lock(wdev);
776 switch (wdev->iftype) {
777 #ifdef CONFIG_CFG80211_WEXT
778 case NL80211_IFTYPE_ADHOC:
779 cfg80211_ibss_wext_join(rdev, wdev);
780 break;
781 case NL80211_IFTYPE_STATION:
782 cfg80211_mgd_wext_connect(rdev, wdev);
783 break;
784 #endif
785 #ifdef CONFIG_MAC80211_MESH
786 case NL80211_IFTYPE_MESH_POINT:
787 {
788 /* backward compat code... */
789 struct mesh_setup setup;
790 memcpy(&setup, &default_mesh_setup,
791 sizeof(setup));
792 /* back compat only needed for mesh_id */
793 setup.mesh_id = wdev->ssid;
794 setup.mesh_id_len = wdev->mesh_id_up_len;
795 if (wdev->mesh_id_up_len)
796 __cfg80211_join_mesh(rdev, dev,
797 &setup,
798 &default_mesh_config);
799 break;
800 }
801 #endif
802 default:
803 break;
804 }
805 wdev_unlock(wdev);
806 rdev->opencount++;
807 mutex_unlock(&rdev->devlist_mtx);
808 cfg80211_unlock_rdev(rdev);
809
810 /*
811 * Configure power management to the driver here so that its
812 * correctly set also after interface type changes etc.
813 */
814 if (wdev->iftype == NL80211_IFTYPE_STATION &&
815 rdev->ops->set_power_mgmt)
816 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
817 wdev->ps,
818 wdev->ps_timeout)) {
819 /* assume this means it's off */
820 wdev->ps = false;
821 }
822 break;
823 case NETDEV_UNREGISTER:
824 /*
825 * NB: cannot take rdev->mtx here because this may be
826 * called within code protected by it when interfaces
827 * are removed with nl80211.
828 */
829 mutex_lock(&rdev->devlist_mtx);
830 /*
831 * It is possible to get NETDEV_UNREGISTER
832 * multiple times. To detect that, check
833 * that the interface is still on the list
834 * of registered interfaces, and only then
835 * remove and clean it up.
836 */
837 if (!list_empty(&wdev->list)) {
838 sysfs_remove_link(&dev->dev.kobj, "phy80211");
839 list_del_rcu(&wdev->list);
840 rdev->devlist_generation++;
841 cfg80211_mlme_purge_registrations(wdev);
842 #ifdef CONFIG_CFG80211_WEXT
843 kfree(wdev->wext.keys);
844 #endif
845 }
846 mutex_unlock(&rdev->devlist_mtx);
847 /*
848 * synchronise (so that we won't find this netdev
849 * from other code any more) and then clear the list
850 * head so that the above code can safely check for
851 * !list_empty() to avoid double-cleanup.
852 */
853 synchronize_rcu();
854 INIT_LIST_HEAD(&wdev->list);
855 break;
856 case NETDEV_PRE_UP:
857 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
858 return notifier_from_errno(-EOPNOTSUPP);
859 if (rfkill_blocked(rdev->rfkill))
860 return notifier_from_errno(-ERFKILL);
861 break;
862 }
863
864 return NOTIFY_DONE;
865 }
866
867 static struct notifier_block cfg80211_netdev_notifier = {
868 .notifier_call = cfg80211_netdev_notifier_call,
869 };
870
cfg80211_pernet_exit(struct net * net)871 static void __net_exit cfg80211_pernet_exit(struct net *net)
872 {
873 struct cfg80211_registered_device *rdev;
874
875 rtnl_lock();
876 mutex_lock(&cfg80211_mutex);
877 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
878 if (net_eq(wiphy_net(&rdev->wiphy), net))
879 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
880 }
881 mutex_unlock(&cfg80211_mutex);
882 rtnl_unlock();
883 }
884
885 static struct pernet_operations cfg80211_pernet_ops = {
886 .exit = cfg80211_pernet_exit,
887 };
888
cfg80211_init(void)889 static int __init cfg80211_init(void)
890 {
891 int err;
892
893 err = register_pernet_device(&cfg80211_pernet_ops);
894 if (err)
895 goto out_fail_pernet;
896
897 err = wiphy_sysfs_init();
898 if (err)
899 goto out_fail_sysfs;
900
901 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
902 if (err)
903 goto out_fail_notifier;
904
905 err = nl80211_init();
906 if (err)
907 goto out_fail_nl80211;
908
909 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
910
911 err = regulatory_init();
912 if (err)
913 goto out_fail_reg;
914
915 cfg80211_wq = create_singlethread_workqueue("cfg80211");
916 if (!cfg80211_wq)
917 goto out_fail_wq;
918
919 return 0;
920
921 out_fail_wq:
922 regulatory_exit();
923 out_fail_reg:
924 debugfs_remove(ieee80211_debugfs_dir);
925 out_fail_nl80211:
926 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
927 out_fail_notifier:
928 wiphy_sysfs_exit();
929 out_fail_sysfs:
930 unregister_pernet_device(&cfg80211_pernet_ops);
931 out_fail_pernet:
932 return err;
933 }
934 subsys_initcall(cfg80211_init);
935
cfg80211_exit(void)936 static void __exit cfg80211_exit(void)
937 {
938 debugfs_remove(ieee80211_debugfs_dir);
939 nl80211_exit();
940 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
941 wiphy_sysfs_exit();
942 regulatory_exit();
943 unregister_pernet_device(&cfg80211_pernet_ops);
944 destroy_workqueue(cfg80211_wq);
945 }
946 module_exit(cfg80211_exit);
947