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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
33MODULE_AUTHOR("Johannes Berg");
34MODULE_LICENSE("GPL");
35MODULE_DESCRIPTION("wireless configuration support");
36
37/* RCU-protected (and cfg80211_mutex for writers) */
38LIST_HEAD(cfg80211_rdev_list);
39int cfg80211_rdev_list_generation;
40
41DEFINE_MUTEX(cfg80211_mutex);
42
43/* for debugfs */
44static struct dentry *ieee80211_debugfs_dir;
45
46/* for the cleanup, scan and event works */
47struct workqueue_struct *cfg80211_wq;
48
49static bool cfg80211_disable_40mhz_24ghz;
50module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
51MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
52 "Disable 40MHz support in the 2.4GHz band");
53
54/* requires cfg80211_mutex to be held! */
55struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
56{
57 struct cfg80211_registered_device *result = NULL, *rdev;
58
59 if (!wiphy_idx_valid(wiphy_idx))
60 return NULL;
61
62 assert_cfg80211_lock();
63
64 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
65 if (rdev->wiphy_idx == wiphy_idx) {
66 result = rdev;
67 break;
68 }
69 }
70
71 return result;
72}
73
74int get_wiphy_idx(struct wiphy *wiphy)
75{
76 struct cfg80211_registered_device *rdev;
77 if (!wiphy)
78 return WIPHY_IDX_STALE;
79 rdev = wiphy_to_dev(wiphy);
80 return rdev->wiphy_idx;
81}
82
83/* requires cfg80211_rdev_mutex to be held! */
84struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
85{
86 struct cfg80211_registered_device *rdev;
87
88 if (!wiphy_idx_valid(wiphy_idx))
89 return NULL;
90
91 assert_cfg80211_lock();
92
93 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
94 if (!rdev)
95 return NULL;
96 return &rdev->wiphy;
97}
98
99/* requires cfg80211_mutex to be held! */
100struct cfg80211_registered_device *
101__cfg80211_rdev_from_info(struct genl_info *info)
102{
103 int ifindex;
104 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
105 struct net_device *dev;
106 int err = -EINVAL;
107
108 assert_cfg80211_lock();
109
110 if (info->attrs[NL80211_ATTR_WIPHY]) {
111 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
112 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
113 err = -ENODEV;
114 }
115
116 if (info->attrs[NL80211_ATTR_IFINDEX]) {
117 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
118 dev = dev_get_by_index(genl_info_net(info), ifindex);
119 if (dev) {
120 if (dev->ieee80211_ptr)
121 byifidx =
122 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
123 dev_put(dev);
124 }
125 err = -ENODEV;
126 }
127
128 if (bywiphyidx && byifidx) {
129 if (bywiphyidx != byifidx)
130 return ERR_PTR(-EINVAL);
131 else
132 return bywiphyidx; /* == byifidx */
133 }
134 if (bywiphyidx)
135 return bywiphyidx;
136
137 if (byifidx)
138 return byifidx;
139
140 return ERR_PTR(err);
141}
142
143struct cfg80211_registered_device *
144cfg80211_get_dev_from_info(struct genl_info *info)
145{
146 struct cfg80211_registered_device *rdev;
147
148 mutex_lock(&cfg80211_mutex);
149 rdev = __cfg80211_rdev_from_info(info);
150
151 /* if it is not an error we grab the lock on
152 * it to assure it won't be going away while
153 * we operate on it */
154 if (!IS_ERR(rdev))
155 mutex_lock(&rdev->mtx);
156
157 mutex_unlock(&cfg80211_mutex);
158
159 return rdev;
160}
161
162struct cfg80211_registered_device *
163cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
164{
165 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
166 struct net_device *dev;
167
168 mutex_lock(&cfg80211_mutex);
169 dev = dev_get_by_index(net, ifindex);
170 if (!dev)
171 goto out;
172 if (dev->ieee80211_ptr) {
173 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
174 mutex_lock(&rdev->mtx);
175 } else
176 rdev = ERR_PTR(-ENODEV);
177 dev_put(dev);
178 out:
179 mutex_unlock(&cfg80211_mutex);
180 return rdev;
181}
182
183/* requires cfg80211_mutex to be held */
184int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
185 char *newname)
186{
187 struct cfg80211_registered_device *rdev2;
188 int wiphy_idx, taken = -1, result, digits;
189
190 assert_cfg80211_lock();
191
192 /* prohibit calling the thing phy%d when %d is not its number */
193 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
194 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
195 /* count number of places needed to print wiphy_idx */
196 digits = 1;
197 while (wiphy_idx /= 10)
198 digits++;
199 /*
200 * deny the name if it is phy<idx> where <idx> is printed
201 * without leading zeroes. taken == strlen(newname) here
202 */
203 if (taken == strlen(PHY_NAME) + digits)
204 return -EINVAL;
205 }
206
207
208 /* Ignore nop renames */
209 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
210 return 0;
211
212 /* Ensure another device does not already have this name. */
213 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
214 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
215 return -EINVAL;
216
217 result = device_rename(&rdev->wiphy.dev, newname);
218 if (result)
219 return result;
220
221 if (rdev->wiphy.debugfsdir &&
222 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
223 rdev->wiphy.debugfsdir,
224 rdev->wiphy.debugfsdir->d_parent,
225 newname))
226 pr_err("failed to rename debugfs dir to %s!\n", newname);
227
228 nl80211_notify_dev_rename(rdev);
229
230 return 0;
231}
232
233int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
234 struct net *net)
235{
236 struct wireless_dev *wdev;
237 int err = 0;
238
239 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
240 return -EOPNOTSUPP;
241
242 list_for_each_entry(wdev, &rdev->netdev_list, list) {
243 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
244 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
245 if (err)
246 break;
247 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
248 }
249
250 if (err) {
251 /* failed -- clean up to old netns */
252 net = wiphy_net(&rdev->wiphy);
253
254 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
255 list) {
256 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
257 err = dev_change_net_namespace(wdev->netdev, net,
258 "wlan%d");
259 WARN_ON(err);
260 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
261 }
262
263 return err;
264 }
265
266 wiphy_net_set(&rdev->wiphy, net);
267
268 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
269 WARN_ON(err);
270
271 return 0;
272}
273
274static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
275{
276 struct cfg80211_registered_device *rdev = data;
277
278 rdev->ops->rfkill_poll(&rdev->wiphy);
279}
280
281static int cfg80211_rfkill_set_block(void *data, bool blocked)
282{
283 struct cfg80211_registered_device *rdev = data;
284 struct wireless_dev *wdev;
285
286 if (!blocked)
287 return 0;
288
289 rtnl_lock();
290 mutex_lock(&rdev->devlist_mtx);
291
292 list_for_each_entry(wdev, &rdev->netdev_list, list)
293 dev_close(wdev->netdev);
294
295 mutex_unlock(&rdev->devlist_mtx);
296 rtnl_unlock();
297
298 return 0;
299}
300
301static void cfg80211_rfkill_sync_work(struct work_struct *work)
302{
303 struct cfg80211_registered_device *rdev;
304
305 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
306 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
307}
308
309static void cfg80211_event_work(struct work_struct *work)
310{
311 struct cfg80211_registered_device *rdev;
312
313 rdev = container_of(work, struct cfg80211_registered_device,
314 event_work);
315
316 rtnl_lock();
317 cfg80211_lock_rdev(rdev);
318
319 cfg80211_process_rdev_events(rdev);
320 cfg80211_unlock_rdev(rdev);
321 rtnl_unlock();
322}
323
324/* exported functions */
325
326struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
327{
328 static int wiphy_counter;
329
330 struct cfg80211_registered_device *rdev;
331 int alloc_size;
332
333 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
334 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
335 WARN_ON(ops->connect && !ops->disconnect);
336 WARN_ON(ops->join_ibss && !ops->leave_ibss);
337 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
338 WARN_ON(ops->add_station && !ops->del_station);
339 WARN_ON(ops->add_mpath && !ops->del_mpath);
340 WARN_ON(ops->join_mesh && !ops->leave_mesh);
341
342 alloc_size = sizeof(*rdev) + sizeof_priv;
343
344 rdev = kzalloc(alloc_size, GFP_KERNEL);
345 if (!rdev)
346 return NULL;
347
348 rdev->ops = ops;
349
350 mutex_lock(&cfg80211_mutex);
351
352 rdev->wiphy_idx = wiphy_counter++;
353
354 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
355 wiphy_counter--;
356 mutex_unlock(&cfg80211_mutex);
357 /* ugh, wrapped! */
358 kfree(rdev);
359 return NULL;
360 }
361
362 mutex_unlock(&cfg80211_mutex);
363
364 /* give it a proper name */
365 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
366
367 mutex_init(&rdev->mtx);
368 mutex_init(&rdev->devlist_mtx);
369 mutex_init(&rdev->sched_scan_mtx);
370 INIT_LIST_HEAD(&rdev->netdev_list);
371 spin_lock_init(&rdev->bss_lock);
372 INIT_LIST_HEAD(&rdev->bss_list);
373 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
374 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
375#ifdef CONFIG_CFG80211_WEXT
376 rdev->wiphy.wext = &cfg80211_wext_handler;
377#endif
378
379 device_initialize(&rdev->wiphy.dev);
380 rdev->wiphy.dev.class = &ieee80211_class;
381 rdev->wiphy.dev.platform_data = rdev;
382
383#ifdef CONFIG_CFG80211_DEFAULT_PS
384 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
385#endif
386
387 wiphy_net_set(&rdev->wiphy, &init_net);
388
389 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
390 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
391 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
392 &rdev->rfkill_ops, rdev);
393
394 if (!rdev->rfkill) {
395 kfree(rdev);
396 return NULL;
397 }
398
399 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
400 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
401 INIT_WORK(&rdev->event_work, cfg80211_event_work);
402
403 init_waitqueue_head(&rdev->dev_wait);
404
405 /*
406 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
407 * Fragmentation and RTS threshold are disabled by default with the
408 * special -1 value.
409 */
410 rdev->wiphy.retry_short = 7;
411 rdev->wiphy.retry_long = 4;
412 rdev->wiphy.frag_threshold = (u32) -1;
413 rdev->wiphy.rts_threshold = (u32) -1;
414 rdev->wiphy.coverage_class = 0;
415
416 return &rdev->wiphy;
417}
418EXPORT_SYMBOL(wiphy_new);
419
420static int wiphy_verify_combinations(struct wiphy *wiphy)
421{
422 const struct ieee80211_iface_combination *c;
423 int i, j;
424
425 /* If we have combinations enforce them */
426 if (wiphy->n_iface_combinations)
427 wiphy->flags |= WIPHY_FLAG_ENFORCE_COMBINATIONS;
428
429 for (i = 0; i < wiphy->n_iface_combinations; i++) {
430 u32 cnt = 0;
431 u16 all_iftypes = 0;
432
433 c = &wiphy->iface_combinations[i];
434
435 /* Combinations with just one interface aren't real */
436 if (WARN_ON(c->max_interfaces < 2))
437 return -EINVAL;
438
439 /* Need at least one channel */
440 if (WARN_ON(!c->num_different_channels))
441 return -EINVAL;
442
443 if (WARN_ON(!c->n_limits))
444 return -EINVAL;
445
446 for (j = 0; j < c->n_limits; j++) {
447 u16 types = c->limits[j].types;
448
449 /*
450 * interface types shouldn't overlap, this is
451 * used in cfg80211_can_change_interface()
452 */
453 if (WARN_ON(types & all_iftypes))
454 return -EINVAL;
455 all_iftypes |= types;
456
457 if (WARN_ON(!c->limits[j].max))
458 return -EINVAL;
459
460 /* Shouldn't list software iftypes in combinations! */
461 if (WARN_ON(wiphy->software_iftypes & types))
462 return -EINVAL;
463
464 cnt += c->limits[j].max;
465 /*
466 * Don't advertise an unsupported type
467 * in a combination.
468 */
469 if (WARN_ON((wiphy->interface_modes & types) != types))
470 return -EINVAL;
471 }
472
473 /* You can't even choose that many! */
474 if (WARN_ON(cnt < c->max_interfaces))
475 return -EINVAL;
476 }
477
478 return 0;
479}
480
481int wiphy_register(struct wiphy *wiphy)
482{
483 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
484 int res;
485 enum ieee80211_band band;
486 struct ieee80211_supported_band *sband;
487 bool have_band = false;
488 int i;
489 u16 ifmodes = wiphy->interface_modes;
490
491 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
492 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
493 return -EINVAL;
494
495 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
496 return -EINVAL;
497
498 if (WARN_ON(wiphy->addresses &&
499 !is_zero_ether_addr(wiphy->perm_addr) &&
500 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
501 ETH_ALEN)))
502 return -EINVAL;
503
504 if (wiphy->addresses)
505 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
506
507 /* sanity check ifmodes */
508 WARN_ON(!ifmodes);
509 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
510 if (WARN_ON(ifmodes != wiphy->interface_modes))
511 wiphy->interface_modes = ifmodes;
512
513 res = wiphy_verify_combinations(wiphy);
514 if (res)
515 return res;
516
517 /* sanity check supported bands/channels */
518 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
519 sband = wiphy->bands[band];
520 if (!sband)
521 continue;
522
523 sband->band = band;
524
525 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
526 return -EINVAL;
527
528 /*
529 * Since cfg80211_disable_40mhz_24ghz is global, we can
530 * modify the sband's ht data even if the driver uses a
531 * global structure for that.
532 */
533 if (cfg80211_disable_40mhz_24ghz &&
534 band == IEEE80211_BAND_2GHZ &&
535 sband->ht_cap.ht_supported) {
536 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
537 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
538 }
539
540 /*
541 * Since we use a u32 for rate bitmaps in
542 * ieee80211_get_response_rate, we cannot
543 * have more than 32 legacy rates.
544 */
545 if (WARN_ON(sband->n_bitrates > 32))
546 return -EINVAL;
547
548 for (i = 0; i < sband->n_channels; i++) {
549 sband->channels[i].orig_flags =
550 sband->channels[i].flags;
551 sband->channels[i].orig_mag =
552 sband->channels[i].max_antenna_gain;
553 sband->channels[i].orig_mpwr =
554 sband->channels[i].max_power;
555 sband->channels[i].band = band;
556 }
557
558 have_band = true;
559 }
560
561 if (!have_band) {
562 WARN_ON(1);
563 return -EINVAL;
564 }
565
566 if (rdev->wiphy.wowlan.n_patterns) {
567 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
568 rdev->wiphy.wowlan.pattern_min_len >
569 rdev->wiphy.wowlan.pattern_max_len))
570 return -EINVAL;
571 }
572
573 /* check and set up bitrates */
574 ieee80211_set_bitrate_flags(wiphy);
575
576 mutex_lock(&cfg80211_mutex);
577
578 res = device_add(&rdev->wiphy.dev);
579 if (res) {
580 mutex_unlock(&cfg80211_mutex);
581 return res;
582 }
583
584 /* set up regulatory info */
585 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
586
587 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
588 cfg80211_rdev_list_generation++;
589
590 /* add to debugfs */
591 rdev->wiphy.debugfsdir =
592 debugfs_create_dir(wiphy_name(&rdev->wiphy),
593 ieee80211_debugfs_dir);
594 if (IS_ERR(rdev->wiphy.debugfsdir))
595 rdev->wiphy.debugfsdir = NULL;
596
597 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
598 struct regulatory_request request;
599
600 request.wiphy_idx = get_wiphy_idx(wiphy);
601 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
602 request.alpha2[0] = '9';
603 request.alpha2[1] = '9';
604
605 nl80211_send_reg_change_event(&request);
606 }
607
608 cfg80211_debugfs_rdev_add(rdev);
609 mutex_unlock(&cfg80211_mutex);
610
611 /*
612 * due to a locking dependency this has to be outside of the
613 * cfg80211_mutex lock
614 */
615 res = rfkill_register(rdev->rfkill);
616 if (res)
617 goto out_rm_dev;
618
619 rtnl_lock();
620 rdev->wiphy.registered = true;
621 rtnl_unlock();
622 return 0;
623
624out_rm_dev:
625 device_del(&rdev->wiphy.dev);
626 return res;
627}
628EXPORT_SYMBOL(wiphy_register);
629
630void wiphy_rfkill_start_polling(struct wiphy *wiphy)
631{
632 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
633
634 if (!rdev->ops->rfkill_poll)
635 return;
636 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
637 rfkill_resume_polling(rdev->rfkill);
638}
639EXPORT_SYMBOL(wiphy_rfkill_start_polling);
640
641void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
642{
643 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
644
645 rfkill_pause_polling(rdev->rfkill);
646}
647EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
648
649void wiphy_unregister(struct wiphy *wiphy)
650{
651 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
652
653 rtnl_lock();
654 rdev->wiphy.registered = false;
655 rtnl_unlock();
656
657 rfkill_unregister(rdev->rfkill);
658
659 /* protect the device list */
660 mutex_lock(&cfg80211_mutex);
661
662 wait_event(rdev->dev_wait, ({
663 int __count;
664 mutex_lock(&rdev->devlist_mtx);
665 __count = rdev->opencount;
666 mutex_unlock(&rdev->devlist_mtx);
667 __count == 0;}));
668
669 mutex_lock(&rdev->devlist_mtx);
670 BUG_ON(!list_empty(&rdev->netdev_list));
671 mutex_unlock(&rdev->devlist_mtx);
672
673 /*
674 * First remove the hardware from everywhere, this makes
675 * it impossible to find from userspace.
676 */
677 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
678 list_del_rcu(&rdev->list);
679 synchronize_rcu();
680
681 /*
682 * Try to grab rdev->mtx. If a command is still in progress,
683 * hopefully the driver will refuse it since it's tearing
684 * down the device already. We wait for this command to complete
685 * before unlinking the item from the list.
686 * Note: as codified by the BUG_ON above we cannot get here if
687 * a virtual interface is still present. Hence, we can only get
688 * to lock contention here if userspace issues a command that
689 * identified the hardware by wiphy index.
690 */
691 cfg80211_lock_rdev(rdev);
692 /* nothing */
693 cfg80211_unlock_rdev(rdev);
694
695 /* If this device got a regulatory hint tell core its
696 * free to listen now to a new shiny device regulatory hint */
697 reg_device_remove(wiphy);
698
699 cfg80211_rdev_list_generation++;
700 device_del(&rdev->wiphy.dev);
701
702 mutex_unlock(&cfg80211_mutex);
703
704 flush_work(&rdev->scan_done_wk);
705 cancel_work_sync(&rdev->conn_work);
706 flush_work(&rdev->event_work);
707}
708EXPORT_SYMBOL(wiphy_unregister);
709
710void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
711{
712 struct cfg80211_internal_bss *scan, *tmp;
713 rfkill_destroy(rdev->rfkill);
714 mutex_destroy(&rdev->mtx);
715 mutex_destroy(&rdev->devlist_mtx);
716 mutex_destroy(&rdev->sched_scan_mtx);
717 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
718 cfg80211_put_bss(&scan->pub);
719 cfg80211_rdev_free_wowlan(rdev);
720 kfree(rdev);
721}
722
723void wiphy_free(struct wiphy *wiphy)
724{
725 put_device(&wiphy->dev);
726}
727EXPORT_SYMBOL(wiphy_free);
728
729void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
730{
731 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
732
733 if (rfkill_set_hw_state(rdev->rfkill, blocked))
734 schedule_work(&rdev->rfkill_sync);
735}
736EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
737
738static void wdev_cleanup_work(struct work_struct *work)
739{
740 struct wireless_dev *wdev;
741 struct cfg80211_registered_device *rdev;
742
743 wdev = container_of(work, struct wireless_dev, cleanup_work);
744 rdev = wiphy_to_dev(wdev->wiphy);
745
746 cfg80211_lock_rdev(rdev);
747
748 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
749 rdev->scan_req->aborted = true;
750 ___cfg80211_scan_done(rdev, true);
751 }
752
753 cfg80211_unlock_rdev(rdev);
754
755 mutex_lock(&rdev->sched_scan_mtx);
756
757 if (WARN_ON(rdev->sched_scan_req &&
758 rdev->sched_scan_req->dev == wdev->netdev)) {
759 __cfg80211_stop_sched_scan(rdev, false);
760 }
761
762 mutex_unlock(&rdev->sched_scan_mtx);
763
764 mutex_lock(&rdev->devlist_mtx);
765 rdev->opencount--;
766 mutex_unlock(&rdev->devlist_mtx);
767 wake_up(&rdev->dev_wait);
768
769 dev_put(wdev->netdev);
770}
771
772static struct device_type wiphy_type = {
773 .name = "wlan",
774};
775
776static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
777 unsigned long state,
778 void *ndev)
779{
780 struct net_device *dev = ndev;
781 struct wireless_dev *wdev = dev->ieee80211_ptr;
782 struct cfg80211_registered_device *rdev;
783 int ret;
784
785 if (!wdev)
786 return NOTIFY_DONE;
787
788 rdev = wiphy_to_dev(wdev->wiphy);
789
790 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
791
792 switch (state) {
793 case NETDEV_POST_INIT:
794 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
795 break;
796 case NETDEV_REGISTER:
797 /*
798 * NB: cannot take rdev->mtx here because this may be
799 * called within code protected by it when interfaces
800 * are added with nl80211.
801 */
802 mutex_init(&wdev->mtx);
803 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
804 INIT_LIST_HEAD(&wdev->event_list);
805 spin_lock_init(&wdev->event_lock);
806 INIT_LIST_HEAD(&wdev->mgmt_registrations);
807 spin_lock_init(&wdev->mgmt_registrations_lock);
808
809 mutex_lock(&rdev->devlist_mtx);
810 list_add_rcu(&wdev->list, &rdev->netdev_list);
811 rdev->devlist_generation++;
812 /* can only change netns with wiphy */
813 dev->features |= NETIF_F_NETNS_LOCAL;
814
815 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
816 "phy80211")) {
817 pr_err("failed to add phy80211 symlink to netdev!\n");
818 }
819 wdev->netdev = dev;
820 wdev->sme_state = CFG80211_SME_IDLE;
821 mutex_unlock(&rdev->devlist_mtx);
822#ifdef CONFIG_CFG80211_WEXT
823 wdev->wext.default_key = -1;
824 wdev->wext.default_mgmt_key = -1;
825 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
826#endif
827
828 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
829 wdev->ps = true;
830 else
831 wdev->ps = false;
832 /* allow mac80211 to determine the timeout */
833 wdev->ps_timeout = -1;
834
835 if (!dev->ethtool_ops)
836 dev->ethtool_ops = &cfg80211_ethtool_ops;
837
838 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
839 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
840 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
841 dev->priv_flags |= IFF_DONT_BRIDGE;
842 break;
843 case NETDEV_GOING_DOWN:
844 switch (wdev->iftype) {
845 case NL80211_IFTYPE_ADHOC:
846 cfg80211_leave_ibss(rdev, dev, true);
847 break;
848 case NL80211_IFTYPE_P2P_CLIENT:
849 case NL80211_IFTYPE_STATION:
850 mutex_lock(&rdev->sched_scan_mtx);
851 __cfg80211_stop_sched_scan(rdev, false);
852 mutex_unlock(&rdev->sched_scan_mtx);
853
854 wdev_lock(wdev);
855#ifdef CONFIG_CFG80211_WEXT
856 kfree(wdev->wext.ie);
857 wdev->wext.ie = NULL;
858 wdev->wext.ie_len = 0;
859 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
860#endif
861 __cfg80211_disconnect(rdev, dev,
862 WLAN_REASON_DEAUTH_LEAVING, true);
863 cfg80211_mlme_down(rdev, dev);
864 wdev_unlock(wdev);
865 break;
866 case NL80211_IFTYPE_MESH_POINT:
867 cfg80211_leave_mesh(rdev, dev);
868 break;
869 default:
870 break;
871 }
872 wdev->beacon_interval = 0;
873 break;
874 case NETDEV_DOWN:
875 dev_hold(dev);
876 queue_work(cfg80211_wq, &wdev->cleanup_work);
877 break;
878 case NETDEV_UP:
879 /*
880 * If we have a really quick DOWN/UP succession we may
881 * have this work still pending ... cancel it and see
882 * if it was pending, in which case we need to account
883 * for some of the work it would have done.
884 */
885 if (cancel_work_sync(&wdev->cleanup_work)) {
886 mutex_lock(&rdev->devlist_mtx);
887 rdev->opencount--;
888 mutex_unlock(&rdev->devlist_mtx);
889 dev_put(dev);
890 }
891 cfg80211_lock_rdev(rdev);
892 mutex_lock(&rdev->devlist_mtx);
893 wdev_lock(wdev);
894 switch (wdev->iftype) {
895#ifdef CONFIG_CFG80211_WEXT
896 case NL80211_IFTYPE_ADHOC:
897 cfg80211_ibss_wext_join(rdev, wdev);
898 break;
899 case NL80211_IFTYPE_STATION:
900 cfg80211_mgd_wext_connect(rdev, wdev);
901 break;
902#endif
903#ifdef CONFIG_MAC80211_MESH
904 case NL80211_IFTYPE_MESH_POINT:
905 {
906 /* backward compat code... */
907 struct mesh_setup setup;
908 memcpy(&setup, &default_mesh_setup,
909 sizeof(setup));
910 /* back compat only needed for mesh_id */
911 setup.mesh_id = wdev->ssid;
912 setup.mesh_id_len = wdev->mesh_id_up_len;
913 if (wdev->mesh_id_up_len)
914 __cfg80211_join_mesh(rdev, dev,
915 &setup,
916 &default_mesh_config);
917 break;
918 }
919#endif
920 default:
921 break;
922 }
923 wdev_unlock(wdev);
924 rdev->opencount++;
925 mutex_unlock(&rdev->devlist_mtx);
926 cfg80211_unlock_rdev(rdev);
927
928 /*
929 * Configure power management to the driver here so that its
930 * correctly set also after interface type changes etc.
931 */
932 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
933 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
934 rdev->ops->set_power_mgmt)
935 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
936 wdev->ps,
937 wdev->ps_timeout)) {
938 /* assume this means it's off */
939 wdev->ps = false;
940 }
941 break;
942 case NETDEV_UNREGISTER:
943 /*
944 * NB: cannot take rdev->mtx here because this may be
945 * called within code protected by it when interfaces
946 * are removed with nl80211.
947 */
948 mutex_lock(&rdev->devlist_mtx);
949 /*
950 * It is possible to get NETDEV_UNREGISTER
951 * multiple times. To detect that, check
952 * that the interface is still on the list
953 * of registered interfaces, and only then
954 * remove and clean it up.
955 */
956 if (!list_empty(&wdev->list)) {
957 sysfs_remove_link(&dev->dev.kobj, "phy80211");
958 list_del_rcu(&wdev->list);
959 rdev->devlist_generation++;
960 cfg80211_mlme_purge_registrations(wdev);
961#ifdef CONFIG_CFG80211_WEXT
962 kfree(wdev->wext.keys);
963#endif
964 }
965 mutex_unlock(&rdev->devlist_mtx);
966 /*
967 * synchronise (so that we won't find this netdev
968 * from other code any more) and then clear the list
969 * head so that the above code can safely check for
970 * !list_empty() to avoid double-cleanup.
971 */
972 synchronize_rcu();
973 INIT_LIST_HEAD(&wdev->list);
974 break;
975 case NETDEV_PRE_UP:
976 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
977 return notifier_from_errno(-EOPNOTSUPP);
978 if (rfkill_blocked(rdev->rfkill))
979 return notifier_from_errno(-ERFKILL);
980 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
981 if (ret)
982 return notifier_from_errno(ret);
983 break;
984 }
985
986 return NOTIFY_DONE;
987}
988
989static struct notifier_block cfg80211_netdev_notifier = {
990 .notifier_call = cfg80211_netdev_notifier_call,
991};
992
993static void __net_exit cfg80211_pernet_exit(struct net *net)
994{
995 struct cfg80211_registered_device *rdev;
996
997 rtnl_lock();
998 mutex_lock(&cfg80211_mutex);
999 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1000 if (net_eq(wiphy_net(&rdev->wiphy), net))
1001 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1002 }
1003 mutex_unlock(&cfg80211_mutex);
1004 rtnl_unlock();
1005}
1006
1007static struct pernet_operations cfg80211_pernet_ops = {
1008 .exit = cfg80211_pernet_exit,
1009};
1010
1011static int __init cfg80211_init(void)
1012{
1013 int err;
1014
1015 err = register_pernet_device(&cfg80211_pernet_ops);
1016 if (err)
1017 goto out_fail_pernet;
1018
1019 err = wiphy_sysfs_init();
1020 if (err)
1021 goto out_fail_sysfs;
1022
1023 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1024 if (err)
1025 goto out_fail_notifier;
1026
1027 err = nl80211_init();
1028 if (err)
1029 goto out_fail_nl80211;
1030
1031 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1032
1033 err = regulatory_init();
1034 if (err)
1035 goto out_fail_reg;
1036
1037 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1038 if (!cfg80211_wq)
1039 goto out_fail_wq;
1040
1041 return 0;
1042
1043out_fail_wq:
1044 regulatory_exit();
1045out_fail_reg:
1046 debugfs_remove(ieee80211_debugfs_dir);
1047out_fail_nl80211:
1048 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1049out_fail_notifier:
1050 wiphy_sysfs_exit();
1051out_fail_sysfs:
1052 unregister_pernet_device(&cfg80211_pernet_ops);
1053out_fail_pernet:
1054 return err;
1055}
1056subsys_initcall(cfg80211_init);
1057
1058static void __exit cfg80211_exit(void)
1059{
1060 debugfs_remove(ieee80211_debugfs_dir);
1061 nl80211_exit();
1062 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1063 wiphy_sysfs_exit();
1064 regulatory_exit();
1065 unregister_pernet_device(&cfg80211_pernet_ops);
1066 destroy_workqueue(cfg80211_wq);
1067}
1068module_exit(cfg80211_exit);
1/*
2 * This is the linux wireless configuration interface.
3 *
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/if.h>
11#include <linux/module.h>
12#include <linux/err.h>
13#include <linux/list.h>
14#include <linux/slab.h>
15#include <linux/nl80211.h>
16#include <linux/debugfs.h>
17#include <linux/notifier.h>
18#include <linux/device.h>
19#include <linux/etherdevice.h>
20#include <linux/rtnetlink.h>
21#include <linux/sched.h>
22#include <net/genetlink.h>
23#include <net/cfg80211.h>
24#include "nl80211.h"
25#include "core.h"
26#include "sysfs.h"
27#include "debugfs.h"
28#include "wext-compat.h"
29#include "rdev-ops.h"
30
31/* name for sysfs, %d is appended */
32#define PHY_NAME "phy"
33
34MODULE_AUTHOR("Johannes Berg");
35MODULE_LICENSE("GPL");
36MODULE_DESCRIPTION("wireless configuration support");
37MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
38
39/* RCU-protected (and RTNL for writers) */
40LIST_HEAD(cfg80211_rdev_list);
41int cfg80211_rdev_list_generation;
42
43/* for debugfs */
44static struct dentry *ieee80211_debugfs_dir;
45
46/* for the cleanup, scan and event works */
47struct workqueue_struct *cfg80211_wq;
48
49static bool cfg80211_disable_40mhz_24ghz;
50module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
51MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
52 "Disable 40MHz support in the 2.4GHz band");
53
54struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
55{
56 struct cfg80211_registered_device *result = NULL, *rdev;
57
58 ASSERT_RTNL();
59
60 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
61 if (rdev->wiphy_idx == wiphy_idx) {
62 result = rdev;
63 break;
64 }
65 }
66
67 return result;
68}
69
70int get_wiphy_idx(struct wiphy *wiphy)
71{
72 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
73
74 return rdev->wiphy_idx;
75}
76
77struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
78{
79 struct cfg80211_registered_device *rdev;
80
81 ASSERT_RTNL();
82
83 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
84 if (!rdev)
85 return NULL;
86 return &rdev->wiphy;
87}
88
89static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
90 const char *newname)
91{
92 struct cfg80211_registered_device *rdev2;
93 int wiphy_idx, taken = -1, digits;
94
95 ASSERT_RTNL();
96
97 /* prohibit calling the thing phy%d when %d is not its number */
98 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
99 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
100 /* count number of places needed to print wiphy_idx */
101 digits = 1;
102 while (wiphy_idx /= 10)
103 digits++;
104 /*
105 * deny the name if it is phy<idx> where <idx> is printed
106 * without leading zeroes. taken == strlen(newname) here
107 */
108 if (taken == strlen(PHY_NAME) + digits)
109 return -EINVAL;
110 }
111
112 /* Ensure another device does not already have this name. */
113 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
114 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
115 return -EINVAL;
116
117 return 0;
118}
119
120int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
121 char *newname)
122{
123 int result;
124
125 ASSERT_RTNL();
126
127 /* Ignore nop renames */
128 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
129 return 0;
130
131 result = cfg80211_dev_check_name(rdev, newname);
132 if (result < 0)
133 return result;
134
135 result = device_rename(&rdev->wiphy.dev, newname);
136 if (result)
137 return result;
138
139 if (rdev->wiphy.debugfsdir &&
140 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
141 rdev->wiphy.debugfsdir,
142 rdev->wiphy.debugfsdir->d_parent,
143 newname))
144 pr_err("failed to rename debugfs dir to %s!\n", newname);
145
146 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
147
148 return 0;
149}
150
151int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
152 struct net *net)
153{
154 struct wireless_dev *wdev;
155 int err = 0;
156
157 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
158 return -EOPNOTSUPP;
159
160 list_for_each_entry(wdev, &rdev->wdev_list, list) {
161 if (!wdev->netdev)
162 continue;
163 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
164 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
165 if (err)
166 break;
167 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
168 }
169
170 if (err) {
171 /* failed -- clean up to old netns */
172 net = wiphy_net(&rdev->wiphy);
173
174 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
175 list) {
176 if (!wdev->netdev)
177 continue;
178 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
179 err = dev_change_net_namespace(wdev->netdev, net,
180 "wlan%d");
181 WARN_ON(err);
182 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
183 }
184
185 return err;
186 }
187
188 wiphy_net_set(&rdev->wiphy, net);
189
190 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
191 WARN_ON(err);
192
193 return 0;
194}
195
196static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
197{
198 struct cfg80211_registered_device *rdev = data;
199
200 rdev_rfkill_poll(rdev);
201}
202
203void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
204 struct wireless_dev *wdev)
205{
206 ASSERT_RTNL();
207
208 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
209 return;
210
211 if (!wdev->p2p_started)
212 return;
213
214 rdev_stop_p2p_device(rdev, wdev);
215 wdev->p2p_started = false;
216
217 rdev->opencount--;
218
219 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
220 if (WARN_ON(!rdev->scan_req->notified))
221 rdev->scan_req->aborted = true;
222 ___cfg80211_scan_done(rdev, false);
223 }
224}
225
226void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
227{
228 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
229 struct wireless_dev *wdev;
230
231 ASSERT_RTNL();
232
233 list_for_each_entry(wdev, &rdev->wdev_list, list) {
234 if (wdev->netdev) {
235 dev_close(wdev->netdev);
236 continue;
237 }
238 /* otherwise, check iftype */
239 switch (wdev->iftype) {
240 case NL80211_IFTYPE_P2P_DEVICE:
241 cfg80211_stop_p2p_device(rdev, wdev);
242 break;
243 default:
244 break;
245 }
246 }
247}
248EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
249
250static int cfg80211_rfkill_set_block(void *data, bool blocked)
251{
252 struct cfg80211_registered_device *rdev = data;
253
254 if (!blocked)
255 return 0;
256
257 rtnl_lock();
258 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
259 rtnl_unlock();
260
261 return 0;
262}
263
264static void cfg80211_rfkill_sync_work(struct work_struct *work)
265{
266 struct cfg80211_registered_device *rdev;
267
268 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
269 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
270}
271
272static void cfg80211_event_work(struct work_struct *work)
273{
274 struct cfg80211_registered_device *rdev;
275
276 rdev = container_of(work, struct cfg80211_registered_device,
277 event_work);
278
279 rtnl_lock();
280 cfg80211_process_rdev_events(rdev);
281 rtnl_unlock();
282}
283
284void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
285{
286 struct cfg80211_iface_destroy *item;
287
288 ASSERT_RTNL();
289
290 spin_lock_irq(&rdev->destroy_list_lock);
291 while ((item = list_first_entry_or_null(&rdev->destroy_list,
292 struct cfg80211_iface_destroy,
293 list))) {
294 struct wireless_dev *wdev, *tmp;
295 u32 nlportid = item->nlportid;
296
297 list_del(&item->list);
298 kfree(item);
299 spin_unlock_irq(&rdev->destroy_list_lock);
300
301 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
302 if (nlportid == wdev->owner_nlportid)
303 rdev_del_virtual_intf(rdev, wdev);
304 }
305
306 spin_lock_irq(&rdev->destroy_list_lock);
307 }
308 spin_unlock_irq(&rdev->destroy_list_lock);
309}
310
311static void cfg80211_destroy_iface_wk(struct work_struct *work)
312{
313 struct cfg80211_registered_device *rdev;
314
315 rdev = container_of(work, struct cfg80211_registered_device,
316 destroy_work);
317
318 rtnl_lock();
319 cfg80211_destroy_ifaces(rdev);
320 rtnl_unlock();
321}
322
323static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
324{
325 struct cfg80211_registered_device *rdev;
326
327 rdev = container_of(work, struct cfg80211_registered_device,
328 sched_scan_stop_wk);
329
330 rtnl_lock();
331
332 __cfg80211_stop_sched_scan(rdev, false);
333
334 rtnl_unlock();
335}
336
337/* exported functions */
338
339struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
340 const char *requested_name)
341{
342 static atomic_t wiphy_counter = ATOMIC_INIT(0);
343
344 struct cfg80211_registered_device *rdev;
345 int alloc_size;
346
347 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
348 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
349 WARN_ON(ops->connect && !ops->disconnect);
350 WARN_ON(ops->join_ibss && !ops->leave_ibss);
351 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
352 WARN_ON(ops->add_station && !ops->del_station);
353 WARN_ON(ops->add_mpath && !ops->del_mpath);
354 WARN_ON(ops->join_mesh && !ops->leave_mesh);
355 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
356 WARN_ON(ops->start_ap && !ops->stop_ap);
357 WARN_ON(ops->join_ocb && !ops->leave_ocb);
358 WARN_ON(ops->suspend && !ops->resume);
359 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
360 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
361 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
362 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
363 WARN_ON(ops->set_tx_power && !ops->get_tx_power);
364 WARN_ON(ops->set_antenna && !ops->get_antenna);
365
366 alloc_size = sizeof(*rdev) + sizeof_priv;
367
368 rdev = kzalloc(alloc_size, GFP_KERNEL);
369 if (!rdev)
370 return NULL;
371
372 rdev->ops = ops;
373
374 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
375
376 if (unlikely(rdev->wiphy_idx < 0)) {
377 /* ugh, wrapped! */
378 atomic_dec(&wiphy_counter);
379 kfree(rdev);
380 return NULL;
381 }
382
383 /* atomic_inc_return makes it start at 1, make it start at 0 */
384 rdev->wiphy_idx--;
385
386 /* give it a proper name */
387 if (requested_name && requested_name[0]) {
388 int rv;
389
390 rtnl_lock();
391 rv = cfg80211_dev_check_name(rdev, requested_name);
392
393 if (rv < 0) {
394 rtnl_unlock();
395 goto use_default_name;
396 }
397
398 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
399 rtnl_unlock();
400 if (rv)
401 goto use_default_name;
402 } else {
403use_default_name:
404 /* NOTE: This is *probably* safe w/out holding rtnl because of
405 * the restrictions on phy names. Probably this call could
406 * fail if some other part of the kernel (re)named a device
407 * phyX. But, might should add some locking and check return
408 * value, and use a different name if this one exists?
409 */
410 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
411 }
412
413 INIT_LIST_HEAD(&rdev->wdev_list);
414 INIT_LIST_HEAD(&rdev->beacon_registrations);
415 spin_lock_init(&rdev->beacon_registrations_lock);
416 spin_lock_init(&rdev->bss_lock);
417 INIT_LIST_HEAD(&rdev->bss_list);
418 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
419 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
420 INIT_LIST_HEAD(&rdev->mlme_unreg);
421 spin_lock_init(&rdev->mlme_unreg_lock);
422 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
423 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
424 cfg80211_dfs_channels_update_work);
425#ifdef CONFIG_CFG80211_WEXT
426 rdev->wiphy.wext = &cfg80211_wext_handler;
427#endif
428
429 device_initialize(&rdev->wiphy.dev);
430 rdev->wiphy.dev.class = &ieee80211_class;
431 rdev->wiphy.dev.platform_data = rdev;
432 device_enable_async_suspend(&rdev->wiphy.dev);
433
434 INIT_LIST_HEAD(&rdev->destroy_list);
435 spin_lock_init(&rdev->destroy_list_lock);
436 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
437 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
438
439#ifdef CONFIG_CFG80211_DEFAULT_PS
440 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
441#endif
442
443 wiphy_net_set(&rdev->wiphy, &init_net);
444
445 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
446 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
447 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
448 &rdev->rfkill_ops, rdev);
449
450 if (!rdev->rfkill) {
451 kfree(rdev);
452 return NULL;
453 }
454
455 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
456 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
457 INIT_WORK(&rdev->event_work, cfg80211_event_work);
458
459 init_waitqueue_head(&rdev->dev_wait);
460
461 /*
462 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
463 * Fragmentation and RTS threshold are disabled by default with the
464 * special -1 value.
465 */
466 rdev->wiphy.retry_short = 7;
467 rdev->wiphy.retry_long = 4;
468 rdev->wiphy.frag_threshold = (u32) -1;
469 rdev->wiphy.rts_threshold = (u32) -1;
470 rdev->wiphy.coverage_class = 0;
471
472 rdev->wiphy.max_num_csa_counters = 1;
473
474 rdev->wiphy.max_sched_scan_plans = 1;
475 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
476
477 return &rdev->wiphy;
478}
479EXPORT_SYMBOL(wiphy_new_nm);
480
481static int wiphy_verify_combinations(struct wiphy *wiphy)
482{
483 const struct ieee80211_iface_combination *c;
484 int i, j;
485
486 for (i = 0; i < wiphy->n_iface_combinations; i++) {
487 u32 cnt = 0;
488 u16 all_iftypes = 0;
489
490 c = &wiphy->iface_combinations[i];
491
492 /*
493 * Combinations with just one interface aren't real,
494 * however we make an exception for DFS.
495 */
496 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
497 return -EINVAL;
498
499 /* Need at least one channel */
500 if (WARN_ON(!c->num_different_channels))
501 return -EINVAL;
502
503 /*
504 * Put a sane limit on maximum number of different
505 * channels to simplify channel accounting code.
506 */
507 if (WARN_ON(c->num_different_channels >
508 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
509 return -EINVAL;
510
511 /* DFS only works on one channel. */
512 if (WARN_ON(c->radar_detect_widths &&
513 (c->num_different_channels > 1)))
514 return -EINVAL;
515
516 if (WARN_ON(!c->n_limits))
517 return -EINVAL;
518
519 for (j = 0; j < c->n_limits; j++) {
520 u16 types = c->limits[j].types;
521
522 /* interface types shouldn't overlap */
523 if (WARN_ON(types & all_iftypes))
524 return -EINVAL;
525 all_iftypes |= types;
526
527 if (WARN_ON(!c->limits[j].max))
528 return -EINVAL;
529
530 /* Shouldn't list software iftypes in combinations! */
531 if (WARN_ON(wiphy->software_iftypes & types))
532 return -EINVAL;
533
534 /* Only a single P2P_DEVICE can be allowed */
535 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
536 c->limits[j].max > 1))
537 return -EINVAL;
538
539 cnt += c->limits[j].max;
540 /*
541 * Don't advertise an unsupported type
542 * in a combination.
543 */
544 if (WARN_ON((wiphy->interface_modes & types) != types))
545 return -EINVAL;
546 }
547
548 /* You can't even choose that many! */
549 if (WARN_ON(cnt < c->max_interfaces))
550 return -EINVAL;
551 }
552
553 return 0;
554}
555
556int wiphy_register(struct wiphy *wiphy)
557{
558 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
559 int res;
560 enum ieee80211_band band;
561 struct ieee80211_supported_band *sband;
562 bool have_band = false;
563 int i;
564 u16 ifmodes = wiphy->interface_modes;
565
566#ifdef CONFIG_PM
567 if (WARN_ON(wiphy->wowlan &&
568 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
569 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
570 return -EINVAL;
571 if (WARN_ON(wiphy->wowlan &&
572 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
573 !wiphy->wowlan->tcp))
574 return -EINVAL;
575#endif
576 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
577 (!rdev->ops->tdls_channel_switch ||
578 !rdev->ops->tdls_cancel_channel_switch)))
579 return -EINVAL;
580
581 /*
582 * if a wiphy has unsupported modes for regulatory channel enforcement,
583 * opt-out of enforcement checking
584 */
585 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
586 BIT(NL80211_IFTYPE_P2P_CLIENT) |
587 BIT(NL80211_IFTYPE_AP) |
588 BIT(NL80211_IFTYPE_P2P_GO) |
589 BIT(NL80211_IFTYPE_ADHOC) |
590 BIT(NL80211_IFTYPE_P2P_DEVICE) |
591 BIT(NL80211_IFTYPE_AP_VLAN) |
592 BIT(NL80211_IFTYPE_MONITOR)))
593 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
594
595 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
596 (wiphy->regulatory_flags &
597 (REGULATORY_CUSTOM_REG |
598 REGULATORY_STRICT_REG |
599 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
600 REGULATORY_COUNTRY_IE_IGNORE))))
601 return -EINVAL;
602
603 if (WARN_ON(wiphy->coalesce &&
604 (!wiphy->coalesce->n_rules ||
605 !wiphy->coalesce->n_patterns) &&
606 (!wiphy->coalesce->pattern_min_len ||
607 wiphy->coalesce->pattern_min_len >
608 wiphy->coalesce->pattern_max_len)))
609 return -EINVAL;
610
611 if (WARN_ON(wiphy->ap_sme_capa &&
612 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
613 return -EINVAL;
614
615 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
616 return -EINVAL;
617
618 if (WARN_ON(wiphy->addresses &&
619 !is_zero_ether_addr(wiphy->perm_addr) &&
620 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
621 ETH_ALEN)))
622 return -EINVAL;
623
624 if (WARN_ON(wiphy->max_acl_mac_addrs &&
625 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
626 !rdev->ops->set_mac_acl)))
627 return -EINVAL;
628
629 if (wiphy->addresses)
630 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
631
632 /* sanity check ifmodes */
633 WARN_ON(!ifmodes);
634 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
635 if (WARN_ON(ifmodes != wiphy->interface_modes))
636 wiphy->interface_modes = ifmodes;
637
638 res = wiphy_verify_combinations(wiphy);
639 if (res)
640 return res;
641
642 /* sanity check supported bands/channels */
643 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
644 sband = wiphy->bands[band];
645 if (!sband)
646 continue;
647
648 sband->band = band;
649 if (WARN_ON(!sband->n_channels))
650 return -EINVAL;
651 /*
652 * on 60GHz band, there are no legacy rates, so
653 * n_bitrates is 0
654 */
655 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
656 !sband->n_bitrates))
657 return -EINVAL;
658
659 /*
660 * Since cfg80211_disable_40mhz_24ghz is global, we can
661 * modify the sband's ht data even if the driver uses a
662 * global structure for that.
663 */
664 if (cfg80211_disable_40mhz_24ghz &&
665 band == IEEE80211_BAND_2GHZ &&
666 sband->ht_cap.ht_supported) {
667 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
668 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
669 }
670
671 /*
672 * Since we use a u32 for rate bitmaps in
673 * ieee80211_get_response_rate, we cannot
674 * have more than 32 legacy rates.
675 */
676 if (WARN_ON(sband->n_bitrates > 32))
677 return -EINVAL;
678
679 for (i = 0; i < sband->n_channels; i++) {
680 sband->channels[i].orig_flags =
681 sband->channels[i].flags;
682 sband->channels[i].orig_mag = INT_MAX;
683 sband->channels[i].orig_mpwr =
684 sband->channels[i].max_power;
685 sband->channels[i].band = band;
686 }
687
688 have_band = true;
689 }
690
691 if (!have_band) {
692 WARN_ON(1);
693 return -EINVAL;
694 }
695
696#ifdef CONFIG_PM
697 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
698 (!rdev->wiphy.wowlan->pattern_min_len ||
699 rdev->wiphy.wowlan->pattern_min_len >
700 rdev->wiphy.wowlan->pattern_max_len)))
701 return -EINVAL;
702#endif
703
704 /* check and set up bitrates */
705 ieee80211_set_bitrate_flags(wiphy);
706
707 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
708
709 rtnl_lock();
710 res = device_add(&rdev->wiphy.dev);
711 if (res) {
712 rtnl_unlock();
713 return res;
714 }
715
716 /* set up regulatory info */
717 wiphy_regulatory_register(wiphy);
718
719 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
720 cfg80211_rdev_list_generation++;
721
722 /* add to debugfs */
723 rdev->wiphy.debugfsdir =
724 debugfs_create_dir(wiphy_name(&rdev->wiphy),
725 ieee80211_debugfs_dir);
726 if (IS_ERR(rdev->wiphy.debugfsdir))
727 rdev->wiphy.debugfsdir = NULL;
728
729 cfg80211_debugfs_rdev_add(rdev);
730 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
731
732 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
733 struct regulatory_request request;
734
735 request.wiphy_idx = get_wiphy_idx(wiphy);
736 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
737 request.alpha2[0] = '9';
738 request.alpha2[1] = '9';
739
740 nl80211_send_reg_change_event(&request);
741 }
742
743 rdev->wiphy.registered = true;
744 rtnl_unlock();
745
746 res = rfkill_register(rdev->rfkill);
747 if (res) {
748 rfkill_destroy(rdev->rfkill);
749 rdev->rfkill = NULL;
750 wiphy_unregister(&rdev->wiphy);
751 return res;
752 }
753
754 return 0;
755}
756EXPORT_SYMBOL(wiphy_register);
757
758void wiphy_rfkill_start_polling(struct wiphy *wiphy)
759{
760 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
761
762 if (!rdev->ops->rfkill_poll)
763 return;
764 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
765 rfkill_resume_polling(rdev->rfkill);
766}
767EXPORT_SYMBOL(wiphy_rfkill_start_polling);
768
769void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
770{
771 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
772
773 rfkill_pause_polling(rdev->rfkill);
774}
775EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
776
777void wiphy_unregister(struct wiphy *wiphy)
778{
779 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
780
781 wait_event(rdev->dev_wait, ({
782 int __count;
783 rtnl_lock();
784 __count = rdev->opencount;
785 rtnl_unlock();
786 __count == 0; }));
787
788 if (rdev->rfkill)
789 rfkill_unregister(rdev->rfkill);
790
791 rtnl_lock();
792 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
793 rdev->wiphy.registered = false;
794
795 WARN_ON(!list_empty(&rdev->wdev_list));
796
797 /*
798 * First remove the hardware from everywhere, this makes
799 * it impossible to find from userspace.
800 */
801 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
802 list_del_rcu(&rdev->list);
803 synchronize_rcu();
804
805 /*
806 * If this device got a regulatory hint tell core its
807 * free to listen now to a new shiny device regulatory hint
808 */
809 wiphy_regulatory_deregister(wiphy);
810
811 cfg80211_rdev_list_generation++;
812 device_del(&rdev->wiphy.dev);
813
814 rtnl_unlock();
815
816 flush_work(&rdev->scan_done_wk);
817 cancel_work_sync(&rdev->conn_work);
818 flush_work(&rdev->event_work);
819 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
820 flush_work(&rdev->destroy_work);
821 flush_work(&rdev->sched_scan_stop_wk);
822 flush_work(&rdev->mlme_unreg_wk);
823
824#ifdef CONFIG_PM
825 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
826 rdev_set_wakeup(rdev, false);
827#endif
828 cfg80211_rdev_free_wowlan(rdev);
829 cfg80211_rdev_free_coalesce(rdev);
830}
831EXPORT_SYMBOL(wiphy_unregister);
832
833void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
834{
835 struct cfg80211_internal_bss *scan, *tmp;
836 struct cfg80211_beacon_registration *reg, *treg;
837 rfkill_destroy(rdev->rfkill);
838 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
839 list_del(®->list);
840 kfree(reg);
841 }
842 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
843 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
844 kfree(rdev);
845}
846
847void wiphy_free(struct wiphy *wiphy)
848{
849 put_device(&wiphy->dev);
850}
851EXPORT_SYMBOL(wiphy_free);
852
853void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
854{
855 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
856
857 if (rfkill_set_hw_state(rdev->rfkill, blocked))
858 schedule_work(&rdev->rfkill_sync);
859}
860EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
861
862void cfg80211_unregister_wdev(struct wireless_dev *wdev)
863{
864 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
865
866 ASSERT_RTNL();
867
868 if (WARN_ON(wdev->netdev))
869 return;
870
871 list_del_rcu(&wdev->list);
872 rdev->devlist_generation++;
873
874 switch (wdev->iftype) {
875 case NL80211_IFTYPE_P2P_DEVICE:
876 cfg80211_mlme_purge_registrations(wdev);
877 cfg80211_stop_p2p_device(rdev, wdev);
878 break;
879 default:
880 WARN_ON_ONCE(1);
881 break;
882 }
883}
884EXPORT_SYMBOL(cfg80211_unregister_wdev);
885
886static const struct device_type wiphy_type = {
887 .name = "wlan",
888};
889
890void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
891 enum nl80211_iftype iftype, int num)
892{
893 ASSERT_RTNL();
894
895 rdev->num_running_ifaces += num;
896 if (iftype == NL80211_IFTYPE_MONITOR)
897 rdev->num_running_monitor_ifaces += num;
898}
899
900void __cfg80211_leave(struct cfg80211_registered_device *rdev,
901 struct wireless_dev *wdev)
902{
903 struct net_device *dev = wdev->netdev;
904 struct cfg80211_sched_scan_request *sched_scan_req;
905
906 ASSERT_RTNL();
907 ASSERT_WDEV_LOCK(wdev);
908
909 switch (wdev->iftype) {
910 case NL80211_IFTYPE_ADHOC:
911 __cfg80211_leave_ibss(rdev, dev, true);
912 break;
913 case NL80211_IFTYPE_P2P_CLIENT:
914 case NL80211_IFTYPE_STATION:
915 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
916 if (sched_scan_req && dev == sched_scan_req->dev)
917 __cfg80211_stop_sched_scan(rdev, false);
918
919#ifdef CONFIG_CFG80211_WEXT
920 kfree(wdev->wext.ie);
921 wdev->wext.ie = NULL;
922 wdev->wext.ie_len = 0;
923 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
924#endif
925 cfg80211_disconnect(rdev, dev,
926 WLAN_REASON_DEAUTH_LEAVING, true);
927 break;
928 case NL80211_IFTYPE_MESH_POINT:
929 __cfg80211_leave_mesh(rdev, dev);
930 break;
931 case NL80211_IFTYPE_AP:
932 case NL80211_IFTYPE_P2P_GO:
933 __cfg80211_stop_ap(rdev, dev, true);
934 break;
935 case NL80211_IFTYPE_OCB:
936 __cfg80211_leave_ocb(rdev, dev);
937 break;
938 case NL80211_IFTYPE_WDS:
939 /* must be handled by mac80211/driver, has no APIs */
940 break;
941 case NL80211_IFTYPE_P2P_DEVICE:
942 /* cannot happen, has no netdev */
943 break;
944 case NL80211_IFTYPE_AP_VLAN:
945 case NL80211_IFTYPE_MONITOR:
946 /* nothing to do */
947 break;
948 case NL80211_IFTYPE_UNSPECIFIED:
949 case NUM_NL80211_IFTYPES:
950 /* invalid */
951 break;
952 }
953}
954
955void cfg80211_leave(struct cfg80211_registered_device *rdev,
956 struct wireless_dev *wdev)
957{
958 wdev_lock(wdev);
959 __cfg80211_leave(rdev, wdev);
960 wdev_unlock(wdev);
961}
962
963void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
964 gfp_t gfp)
965{
966 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
967 struct cfg80211_event *ev;
968 unsigned long flags;
969
970 trace_cfg80211_stop_iface(wiphy, wdev);
971
972 ev = kzalloc(sizeof(*ev), gfp);
973 if (!ev)
974 return;
975
976 ev->type = EVENT_STOPPED;
977
978 spin_lock_irqsave(&wdev->event_lock, flags);
979 list_add_tail(&ev->list, &wdev->event_list);
980 spin_unlock_irqrestore(&wdev->event_lock, flags);
981 queue_work(cfg80211_wq, &rdev->event_work);
982}
983EXPORT_SYMBOL(cfg80211_stop_iface);
984
985static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
986 unsigned long state, void *ptr)
987{
988 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
989 struct wireless_dev *wdev = dev->ieee80211_ptr;
990 struct cfg80211_registered_device *rdev;
991 struct cfg80211_sched_scan_request *sched_scan_req;
992
993 if (!wdev)
994 return NOTIFY_DONE;
995
996 rdev = wiphy_to_rdev(wdev->wiphy);
997
998 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
999
1000 switch (state) {
1001 case NETDEV_POST_INIT:
1002 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1003 break;
1004 case NETDEV_REGISTER:
1005 /*
1006 * NB: cannot take rdev->mtx here because this may be
1007 * called within code protected by it when interfaces
1008 * are added with nl80211.
1009 */
1010 mutex_init(&wdev->mtx);
1011 INIT_LIST_HEAD(&wdev->event_list);
1012 spin_lock_init(&wdev->event_lock);
1013 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1014 spin_lock_init(&wdev->mgmt_registrations_lock);
1015
1016 wdev->identifier = ++rdev->wdev_id;
1017 list_add_rcu(&wdev->list, &rdev->wdev_list);
1018 rdev->devlist_generation++;
1019 /* can only change netns with wiphy */
1020 dev->features |= NETIF_F_NETNS_LOCAL;
1021
1022 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1023 "phy80211")) {
1024 pr_err("failed to add phy80211 symlink to netdev!\n");
1025 }
1026 wdev->netdev = dev;
1027#ifdef CONFIG_CFG80211_WEXT
1028 wdev->wext.default_key = -1;
1029 wdev->wext.default_mgmt_key = -1;
1030 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1031#endif
1032
1033 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1034 wdev->ps = true;
1035 else
1036 wdev->ps = false;
1037 /* allow mac80211 to determine the timeout */
1038 wdev->ps_timeout = -1;
1039
1040 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1041 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1042 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1043 dev->priv_flags |= IFF_DONT_BRIDGE;
1044 break;
1045 case NETDEV_GOING_DOWN:
1046 cfg80211_leave(rdev, wdev);
1047 break;
1048 case NETDEV_DOWN:
1049 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1050 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1051 if (WARN_ON(!rdev->scan_req->notified))
1052 rdev->scan_req->aborted = true;
1053 ___cfg80211_scan_done(rdev, false);
1054 }
1055
1056 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1057 if (WARN_ON(sched_scan_req &&
1058 sched_scan_req->dev == wdev->netdev)) {
1059 __cfg80211_stop_sched_scan(rdev, false);
1060 }
1061
1062 rdev->opencount--;
1063 wake_up(&rdev->dev_wait);
1064 break;
1065 case NETDEV_UP:
1066 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1067 wdev_lock(wdev);
1068 switch (wdev->iftype) {
1069#ifdef CONFIG_CFG80211_WEXT
1070 case NL80211_IFTYPE_ADHOC:
1071 cfg80211_ibss_wext_join(rdev, wdev);
1072 break;
1073 case NL80211_IFTYPE_STATION:
1074 cfg80211_mgd_wext_connect(rdev, wdev);
1075 break;
1076#endif
1077#ifdef CONFIG_MAC80211_MESH
1078 case NL80211_IFTYPE_MESH_POINT:
1079 {
1080 /* backward compat code... */
1081 struct mesh_setup setup;
1082 memcpy(&setup, &default_mesh_setup,
1083 sizeof(setup));
1084 /* back compat only needed for mesh_id */
1085 setup.mesh_id = wdev->ssid;
1086 setup.mesh_id_len = wdev->mesh_id_up_len;
1087 if (wdev->mesh_id_up_len)
1088 __cfg80211_join_mesh(rdev, dev,
1089 &setup,
1090 &default_mesh_config);
1091 break;
1092 }
1093#endif
1094 default:
1095 break;
1096 }
1097 wdev_unlock(wdev);
1098 rdev->opencount++;
1099
1100 /*
1101 * Configure power management to the driver here so that its
1102 * correctly set also after interface type changes etc.
1103 */
1104 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1105 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1106 rdev->ops->set_power_mgmt)
1107 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1108 wdev->ps_timeout)) {
1109 /* assume this means it's off */
1110 wdev->ps = false;
1111 }
1112 break;
1113 case NETDEV_UNREGISTER:
1114 /*
1115 * It is possible to get NETDEV_UNREGISTER
1116 * multiple times. To detect that, check
1117 * that the interface is still on the list
1118 * of registered interfaces, and only then
1119 * remove and clean it up.
1120 */
1121 if (!list_empty(&wdev->list)) {
1122 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1123 list_del_rcu(&wdev->list);
1124 rdev->devlist_generation++;
1125 cfg80211_mlme_purge_registrations(wdev);
1126#ifdef CONFIG_CFG80211_WEXT
1127 kzfree(wdev->wext.keys);
1128#endif
1129 }
1130 /*
1131 * synchronise (so that we won't find this netdev
1132 * from other code any more) and then clear the list
1133 * head so that the above code can safely check for
1134 * !list_empty() to avoid double-cleanup.
1135 */
1136 synchronize_rcu();
1137 INIT_LIST_HEAD(&wdev->list);
1138 /*
1139 * Ensure that all events have been processed and
1140 * freed.
1141 */
1142 cfg80211_process_wdev_events(wdev);
1143
1144 if (WARN_ON(wdev->current_bss)) {
1145 cfg80211_unhold_bss(wdev->current_bss);
1146 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1147 wdev->current_bss = NULL;
1148 }
1149 break;
1150 case NETDEV_PRE_UP:
1151 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1152 return notifier_from_errno(-EOPNOTSUPP);
1153 if (rfkill_blocked(rdev->rfkill))
1154 return notifier_from_errno(-ERFKILL);
1155 break;
1156 default:
1157 return NOTIFY_DONE;
1158 }
1159
1160 wireless_nlevent_flush();
1161
1162 return NOTIFY_OK;
1163}
1164
1165static struct notifier_block cfg80211_netdev_notifier = {
1166 .notifier_call = cfg80211_netdev_notifier_call,
1167};
1168
1169static void __net_exit cfg80211_pernet_exit(struct net *net)
1170{
1171 struct cfg80211_registered_device *rdev;
1172
1173 rtnl_lock();
1174 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1175 if (net_eq(wiphy_net(&rdev->wiphy), net))
1176 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1177 }
1178 rtnl_unlock();
1179}
1180
1181static struct pernet_operations cfg80211_pernet_ops = {
1182 .exit = cfg80211_pernet_exit,
1183};
1184
1185static int __init cfg80211_init(void)
1186{
1187 int err;
1188
1189 err = register_pernet_device(&cfg80211_pernet_ops);
1190 if (err)
1191 goto out_fail_pernet;
1192
1193 err = wiphy_sysfs_init();
1194 if (err)
1195 goto out_fail_sysfs;
1196
1197 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1198 if (err)
1199 goto out_fail_notifier;
1200
1201 err = nl80211_init();
1202 if (err)
1203 goto out_fail_nl80211;
1204
1205 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1206
1207 err = regulatory_init();
1208 if (err)
1209 goto out_fail_reg;
1210
1211 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1212 if (!cfg80211_wq) {
1213 err = -ENOMEM;
1214 goto out_fail_wq;
1215 }
1216
1217 return 0;
1218
1219out_fail_wq:
1220 regulatory_exit();
1221out_fail_reg:
1222 debugfs_remove(ieee80211_debugfs_dir);
1223 nl80211_exit();
1224out_fail_nl80211:
1225 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1226out_fail_notifier:
1227 wiphy_sysfs_exit();
1228out_fail_sysfs:
1229 unregister_pernet_device(&cfg80211_pernet_ops);
1230out_fail_pernet:
1231 return err;
1232}
1233subsys_initcall(cfg80211_init);
1234
1235static void __exit cfg80211_exit(void)
1236{
1237 debugfs_remove(ieee80211_debugfs_dir);
1238 nl80211_exit();
1239 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1240 wiphy_sysfs_exit();
1241 regulatory_exit();
1242 unregister_pernet_device(&cfg80211_pernet_ops);
1243 destroy_workqueue(cfg80211_wq);
1244}
1245module_exit(cfg80211_exit);