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Merge tag 'driver-core-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / net / wireless / core.c
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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#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_dev(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
89int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
90 char *newname)
91{
92 struct cfg80211_registered_device *rdev2;
93 int wiphy_idx, taken = -1, result, 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
113 /* Ignore nop renames */
114 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
115 return 0;
116
117 /* Ensure another device does not already have this name. */
118 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
119 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
120 return -EINVAL;
121
122 result = device_rename(&rdev->wiphy.dev, newname);
123 if (result)
124 return result;
125
126 if (rdev->wiphy.debugfsdir &&
127 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
128 rdev->wiphy.debugfsdir,
129 rdev->wiphy.debugfsdir->d_parent,
130 newname))
131 pr_err("failed to rename debugfs dir to %s!\n", newname);
132
133 nl80211_notify_dev_rename(rdev);
134
135 return 0;
136}
137
138int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
139 struct net *net)
140{
141 struct wireless_dev *wdev;
142 int err = 0;
143
144 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
145 return -EOPNOTSUPP;
146
147 list_for_each_entry(wdev, &rdev->wdev_list, list) {
148 if (!wdev->netdev)
149 continue;
150 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
151 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
152 if (err)
153 break;
154 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
155 }
156
157 if (err) {
158 /* failed -- clean up to old netns */
159 net = wiphy_net(&rdev->wiphy);
160
161 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
162 list) {
163 if (!wdev->netdev)
164 continue;
165 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
166 err = dev_change_net_namespace(wdev->netdev, net,
167 "wlan%d");
168 WARN_ON(err);
169 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
170 }
171
172 return err;
173 }
174
175 wiphy_net_set(&rdev->wiphy, net);
176
177 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
178 WARN_ON(err);
179
180 return 0;
181}
182
183static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
184{
185 struct cfg80211_registered_device *rdev = data;
186
187 rdev_rfkill_poll(rdev);
188}
189
190void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
191 struct wireless_dev *wdev)
192{
193 ASSERT_RTNL();
194
195 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
196 return;
197
198 if (!wdev->p2p_started)
199 return;
200
201 rdev_stop_p2p_device(rdev, wdev);
202 wdev->p2p_started = false;
203
204 rdev->opencount--;
205
206 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
207 if (WARN_ON(!rdev->scan_req->notified))
208 rdev->scan_req->aborted = true;
209 ___cfg80211_scan_done(rdev, false);
210 }
211}
212
213static int cfg80211_rfkill_set_block(void *data, bool blocked)
214{
215 struct cfg80211_registered_device *rdev = data;
216 struct wireless_dev *wdev;
217
218 if (!blocked)
219 return 0;
220
221 rtnl_lock();
222
223 list_for_each_entry(wdev, &rdev->wdev_list, list) {
224 if (wdev->netdev) {
225 dev_close(wdev->netdev);
226 continue;
227 }
228 /* otherwise, check iftype */
229 switch (wdev->iftype) {
230 case NL80211_IFTYPE_P2P_DEVICE:
231 cfg80211_stop_p2p_device(rdev, wdev);
232 break;
233 default:
234 break;
235 }
236 }
237
238 rtnl_unlock();
239
240 return 0;
241}
242
243static void cfg80211_rfkill_sync_work(struct work_struct *work)
244{
245 struct cfg80211_registered_device *rdev;
246
247 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
248 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
249}
250
251static void cfg80211_event_work(struct work_struct *work)
252{
253 struct cfg80211_registered_device *rdev;
254
255 rdev = container_of(work, struct cfg80211_registered_device,
256 event_work);
257
258 rtnl_lock();
259 cfg80211_process_rdev_events(rdev);
260 rtnl_unlock();
261}
262
263/* exported functions */
264
265struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
266{
267 static atomic_t wiphy_counter = ATOMIC_INIT(0);
268
269 struct cfg80211_registered_device *rdev;
270 int alloc_size;
271
272 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
273 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
274 WARN_ON(ops->connect && !ops->disconnect);
275 WARN_ON(ops->join_ibss && !ops->leave_ibss);
276 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
277 WARN_ON(ops->add_station && !ops->del_station);
278 WARN_ON(ops->add_mpath && !ops->del_mpath);
279 WARN_ON(ops->join_mesh && !ops->leave_mesh);
280
281 alloc_size = sizeof(*rdev) + sizeof_priv;
282
283 rdev = kzalloc(alloc_size, GFP_KERNEL);
284 if (!rdev)
285 return NULL;
286
287 rdev->ops = ops;
288
289 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
290
291 if (unlikely(rdev->wiphy_idx < 0)) {
292 /* ugh, wrapped! */
293 atomic_dec(&wiphy_counter);
294 kfree(rdev);
295 return NULL;
296 }
297
298 /* atomic_inc_return makes it start at 1, make it start at 0 */
299 rdev->wiphy_idx--;
300
301 /* give it a proper name */
302 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
303
304 INIT_LIST_HEAD(&rdev->wdev_list);
305 INIT_LIST_HEAD(&rdev->beacon_registrations);
306 spin_lock_init(&rdev->beacon_registrations_lock);
307 spin_lock_init(&rdev->bss_lock);
308 INIT_LIST_HEAD(&rdev->bss_list);
309 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
310 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
311 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
312 cfg80211_dfs_channels_update_work);
313#ifdef CONFIG_CFG80211_WEXT
314 rdev->wiphy.wext = &cfg80211_wext_handler;
315#endif
316
317 device_initialize(&rdev->wiphy.dev);
318 rdev->wiphy.dev.class = &ieee80211_class;
319 rdev->wiphy.dev.platform_data = rdev;
320
321#ifdef CONFIG_CFG80211_DEFAULT_PS
322 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
323#endif
324
325 wiphy_net_set(&rdev->wiphy, &init_net);
326
327 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
328 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
329 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
330 &rdev->rfkill_ops, rdev);
331
332 if (!rdev->rfkill) {
333 kfree(rdev);
334 return NULL;
335 }
336
337 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
338 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
339 INIT_WORK(&rdev->event_work, cfg80211_event_work);
340
341 init_waitqueue_head(&rdev->dev_wait);
342
343 /*
344 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
345 * Fragmentation and RTS threshold are disabled by default with the
346 * special -1 value.
347 */
348 rdev->wiphy.retry_short = 7;
349 rdev->wiphy.retry_long = 4;
350 rdev->wiphy.frag_threshold = (u32) -1;
351 rdev->wiphy.rts_threshold = (u32) -1;
352 rdev->wiphy.coverage_class = 0;
353
354 return &rdev->wiphy;
355}
356EXPORT_SYMBOL(wiphy_new);
357
358static int wiphy_verify_combinations(struct wiphy *wiphy)
359{
360 const struct ieee80211_iface_combination *c;
361 int i, j;
362
363 for (i = 0; i < wiphy->n_iface_combinations; i++) {
364 u32 cnt = 0;
365 u16 all_iftypes = 0;
366
367 c = &wiphy->iface_combinations[i];
368
369 /*
370 * Combinations with just one interface aren't real,
371 * however we make an exception for DFS.
372 */
373 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
374 return -EINVAL;
375
376 /* Need at least one channel */
377 if (WARN_ON(!c->num_different_channels))
378 return -EINVAL;
379
380 /*
381 * Put a sane limit on maximum number of different
382 * channels to simplify channel accounting code.
383 */
384 if (WARN_ON(c->num_different_channels >
385 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
386 return -EINVAL;
387
388 /* DFS only works on one channel. */
389 if (WARN_ON(c->radar_detect_widths &&
390 (c->num_different_channels > 1)))
391 return -EINVAL;
392
393 if (WARN_ON(!c->n_limits))
394 return -EINVAL;
395
396 for (j = 0; j < c->n_limits; j++) {
397 u16 types = c->limits[j].types;
398
399 /*
400 * interface types shouldn't overlap, this is
401 * used in cfg80211_can_change_interface()
402 */
403 if (WARN_ON(types & all_iftypes))
404 return -EINVAL;
405 all_iftypes |= types;
406
407 if (WARN_ON(!c->limits[j].max))
408 return -EINVAL;
409
410 /* Shouldn't list software iftypes in combinations! */
411 if (WARN_ON(wiphy->software_iftypes & types))
412 return -EINVAL;
413
414 /* Only a single P2P_DEVICE can be allowed */
415 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
416 c->limits[j].max > 1))
417 return -EINVAL;
418
419 cnt += c->limits[j].max;
420 /*
421 * Don't advertise an unsupported type
422 * in a combination.
423 */
424 if (WARN_ON((wiphy->interface_modes & types) != types))
425 return -EINVAL;
426 }
427
428 /* You can't even choose that many! */
429 if (WARN_ON(cnt < c->max_interfaces))
430 return -EINVAL;
431 }
432
433 return 0;
434}
435
436int wiphy_register(struct wiphy *wiphy)
437{
438 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
439 int res;
440 enum ieee80211_band band;
441 struct ieee80211_supported_band *sband;
442 bool have_band = false;
443 int i;
444 u16 ifmodes = wiphy->interface_modes;
445
446 /*
447 * There are major locking problems in nl80211/mac80211 for CSA,
448 * disable for all drivers until this has been reworked.
449 */
450 wiphy->flags &= ~WIPHY_FLAG_HAS_CHANNEL_SWITCH;
451
452#ifdef CONFIG_PM
453 if (WARN_ON(wiphy->wowlan &&
454 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
455 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
456 return -EINVAL;
457 if (WARN_ON(wiphy->wowlan &&
458 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
459 !wiphy->wowlan->tcp))
460 return -EINVAL;
461#endif
462
463 if (WARN_ON(wiphy->coalesce &&
464 (!wiphy->coalesce->n_rules ||
465 !wiphy->coalesce->n_patterns) &&
466 (!wiphy->coalesce->pattern_min_len ||
467 wiphy->coalesce->pattern_min_len >
468 wiphy->coalesce->pattern_max_len)))
469 return -EINVAL;
470
471 if (WARN_ON(wiphy->ap_sme_capa &&
472 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
473 return -EINVAL;
474
475 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
476 return -EINVAL;
477
478 if (WARN_ON(wiphy->addresses &&
479 !is_zero_ether_addr(wiphy->perm_addr) &&
480 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
481 ETH_ALEN)))
482 return -EINVAL;
483
484 if (WARN_ON(wiphy->max_acl_mac_addrs &&
485 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
486 !rdev->ops->set_mac_acl)))
487 return -EINVAL;
488
489 if (wiphy->addresses)
490 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
491
492 /* sanity check ifmodes */
493 WARN_ON(!ifmodes);
494 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
495 if (WARN_ON(ifmodes != wiphy->interface_modes))
496 wiphy->interface_modes = ifmodes;
497
498 res = wiphy_verify_combinations(wiphy);
499 if (res)
500 return res;
501
502 /* sanity check supported bands/channels */
503 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
504 sband = wiphy->bands[band];
505 if (!sband)
506 continue;
507
508 sband->band = band;
509 if (WARN_ON(!sband->n_channels))
510 return -EINVAL;
511 /*
512 * on 60gHz band, there are no legacy rates, so
513 * n_bitrates is 0
514 */
515 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
516 !sband->n_bitrates))
517 return -EINVAL;
518
519 /*
520 * Since cfg80211_disable_40mhz_24ghz is global, we can
521 * modify the sband's ht data even if the driver uses a
522 * global structure for that.
523 */
524 if (cfg80211_disable_40mhz_24ghz &&
525 band == IEEE80211_BAND_2GHZ &&
526 sband->ht_cap.ht_supported) {
527 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
528 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
529 }
530
531 /*
532 * Since we use a u32 for rate bitmaps in
533 * ieee80211_get_response_rate, we cannot
534 * have more than 32 legacy rates.
535 */
536 if (WARN_ON(sband->n_bitrates > 32))
537 return -EINVAL;
538
539 for (i = 0; i < sband->n_channels; i++) {
540 sband->channels[i].orig_flags =
541 sband->channels[i].flags;
542 sband->channels[i].orig_mag = INT_MAX;
543 sband->channels[i].orig_mpwr =
544 sband->channels[i].max_power;
545 sband->channels[i].band = band;
546 }
547
548 have_band = true;
549 }
550
551 if (!have_band) {
552 WARN_ON(1);
553 return -EINVAL;
554 }
555
556#ifdef CONFIG_PM
557 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
558 (!rdev->wiphy.wowlan->pattern_min_len ||
559 rdev->wiphy.wowlan->pattern_min_len >
560 rdev->wiphy.wowlan->pattern_max_len)))
561 return -EINVAL;
562#endif
563
564 /* check and set up bitrates */
565 ieee80211_set_bitrate_flags(wiphy);
566
567 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
568
569 rtnl_lock();
570 res = device_add(&rdev->wiphy.dev);
571 if (res) {
572 rtnl_unlock();
573 return res;
574 }
575
576 /* set up regulatory info */
577 wiphy_regulatory_register(wiphy);
578
579 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
580 cfg80211_rdev_list_generation++;
581
582 /* add to debugfs */
583 rdev->wiphy.debugfsdir =
584 debugfs_create_dir(wiphy_name(&rdev->wiphy),
585 ieee80211_debugfs_dir);
586 if (IS_ERR(rdev->wiphy.debugfsdir))
587 rdev->wiphy.debugfsdir = NULL;
588
589 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
590 struct regulatory_request request;
591
592 request.wiphy_idx = get_wiphy_idx(wiphy);
593 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
594 request.alpha2[0] = '9';
595 request.alpha2[1] = '9';
596
597 nl80211_send_reg_change_event(&request);
598 }
599
600 cfg80211_debugfs_rdev_add(rdev);
601
602 rdev->wiphy.registered = true;
603 rtnl_unlock();
604
605 res = rfkill_register(rdev->rfkill);
606 if (res) {
607 rfkill_destroy(rdev->rfkill);
608 rdev->rfkill = NULL;
609 wiphy_unregister(&rdev->wiphy);
610 return res;
611 }
612
613 return 0;
614}
615EXPORT_SYMBOL(wiphy_register);
616
617void wiphy_rfkill_start_polling(struct wiphy *wiphy)
618{
619 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
620
621 if (!rdev->ops->rfkill_poll)
622 return;
623 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
624 rfkill_resume_polling(rdev->rfkill);
625}
626EXPORT_SYMBOL(wiphy_rfkill_start_polling);
627
628void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
629{
630 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
631
632 rfkill_pause_polling(rdev->rfkill);
633}
634EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
635
636void wiphy_unregister(struct wiphy *wiphy)
637{
638 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
639
640 wait_event(rdev->dev_wait, ({
641 int __count;
642 rtnl_lock();
643 __count = rdev->opencount;
644 rtnl_unlock();
645 __count == 0; }));
646
647 if (rdev->rfkill)
648 rfkill_unregister(rdev->rfkill);
649
650 rtnl_lock();
651 rdev->wiphy.registered = false;
652
653 BUG_ON(!list_empty(&rdev->wdev_list));
654
655 /*
656 * First remove the hardware from everywhere, this makes
657 * it impossible to find from userspace.
658 */
659 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
660 list_del_rcu(&rdev->list);
661 synchronize_rcu();
662
663 /*
664 * If this device got a regulatory hint tell core its
665 * free to listen now to a new shiny device regulatory hint
666 */
667 wiphy_regulatory_deregister(wiphy);
668
669 cfg80211_rdev_list_generation++;
670 device_del(&rdev->wiphy.dev);
671
672 rtnl_unlock();
673
674 flush_work(&rdev->scan_done_wk);
675 cancel_work_sync(&rdev->conn_work);
676 flush_work(&rdev->event_work);
677 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
678
679#ifdef CONFIG_PM
680 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
681 rdev_set_wakeup(rdev, false);
682#endif
683 cfg80211_rdev_free_wowlan(rdev);
684 cfg80211_rdev_free_coalesce(rdev);
685}
686EXPORT_SYMBOL(wiphy_unregister);
687
688void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
689{
690 struct cfg80211_internal_bss *scan, *tmp;
691 struct cfg80211_beacon_registration *reg, *treg;
692 rfkill_destroy(rdev->rfkill);
693 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
694 list_del(&reg->list);
695 kfree(reg);
696 }
697 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
698 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
699 kfree(rdev);
700}
701
702void wiphy_free(struct wiphy *wiphy)
703{
704 put_device(&wiphy->dev);
705}
706EXPORT_SYMBOL(wiphy_free);
707
708void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
709{
710 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
711
712 if (rfkill_set_hw_state(rdev->rfkill, blocked))
713 schedule_work(&rdev->rfkill_sync);
714}
715EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
716
717void cfg80211_unregister_wdev(struct wireless_dev *wdev)
718{
719 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
720
721 ASSERT_RTNL();
722
723 if (WARN_ON(wdev->netdev))
724 return;
725
726 list_del_rcu(&wdev->list);
727 rdev->devlist_generation++;
728
729 switch (wdev->iftype) {
730 case NL80211_IFTYPE_P2P_DEVICE:
731 cfg80211_stop_p2p_device(rdev, wdev);
732 break;
733 default:
734 WARN_ON_ONCE(1);
735 break;
736 }
737}
738EXPORT_SYMBOL(cfg80211_unregister_wdev);
739
740static struct device_type wiphy_type = {
741 .name = "wlan",
742};
743
744void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
745 enum nl80211_iftype iftype, int num)
746{
747 ASSERT_RTNL();
748
749 rdev->num_running_ifaces += num;
750 if (iftype == NL80211_IFTYPE_MONITOR)
751 rdev->num_running_monitor_ifaces += num;
752}
753
754void cfg80211_leave(struct cfg80211_registered_device *rdev,
755 struct wireless_dev *wdev)
756{
757 struct net_device *dev = wdev->netdev;
758
759 ASSERT_RTNL();
760
761 switch (wdev->iftype) {
762 case NL80211_IFTYPE_ADHOC:
763 cfg80211_leave_ibss(rdev, dev, true);
764 break;
765 case NL80211_IFTYPE_P2P_CLIENT:
766 case NL80211_IFTYPE_STATION:
767 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev)
768 __cfg80211_stop_sched_scan(rdev, false);
769
770 wdev_lock(wdev);
771#ifdef CONFIG_CFG80211_WEXT
772 kfree(wdev->wext.ie);
773 wdev->wext.ie = NULL;
774 wdev->wext.ie_len = 0;
775 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
776#endif
777 cfg80211_disconnect(rdev, dev,
778 WLAN_REASON_DEAUTH_LEAVING, true);
779 wdev_unlock(wdev);
780 break;
781 case NL80211_IFTYPE_MESH_POINT:
782 cfg80211_leave_mesh(rdev, dev);
783 break;
784 case NL80211_IFTYPE_AP:
785 case NL80211_IFTYPE_P2P_GO:
786 cfg80211_stop_ap(rdev, dev);
787 break;
788 default:
789 break;
790 }
791}
792
793static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
794 unsigned long state, void *ptr)
795{
796 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
797 struct wireless_dev *wdev = dev->ieee80211_ptr;
798 struct cfg80211_registered_device *rdev;
799 int ret;
800
801 if (!wdev)
802 return NOTIFY_DONE;
803
804 rdev = wiphy_to_dev(wdev->wiphy);
805
806 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
807
808 switch (state) {
809 case NETDEV_POST_INIT:
810 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
811 break;
812 case NETDEV_REGISTER:
813 /*
814 * NB: cannot take rdev->mtx here because this may be
815 * called within code protected by it when interfaces
816 * are added with nl80211.
817 */
818 mutex_init(&wdev->mtx);
819 INIT_LIST_HEAD(&wdev->event_list);
820 spin_lock_init(&wdev->event_lock);
821 INIT_LIST_HEAD(&wdev->mgmt_registrations);
822 spin_lock_init(&wdev->mgmt_registrations_lock);
823
824 wdev->identifier = ++rdev->wdev_id;
825 list_add_rcu(&wdev->list, &rdev->wdev_list);
826 rdev->devlist_generation++;
827 /* can only change netns with wiphy */
828 dev->features |= NETIF_F_NETNS_LOCAL;
829
830 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
831 "phy80211")) {
832 pr_err("failed to add phy80211 symlink to netdev!\n");
833 }
834 wdev->netdev = dev;
835#ifdef CONFIG_CFG80211_WEXT
836 wdev->wext.default_key = -1;
837 wdev->wext.default_mgmt_key = -1;
838 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
839#endif
840
841 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
842 wdev->ps = true;
843 else
844 wdev->ps = false;
845 /* allow mac80211 to determine the timeout */
846 wdev->ps_timeout = -1;
847
848 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
849
850 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
851 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
852 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
853 dev->priv_flags |= IFF_DONT_BRIDGE;
854 break;
855 case NETDEV_GOING_DOWN:
856 cfg80211_leave(rdev, wdev);
857 break;
858 case NETDEV_DOWN:
859 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
860 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
861 if (WARN_ON(!rdev->scan_req->notified))
862 rdev->scan_req->aborted = true;
863 ___cfg80211_scan_done(rdev, false);
864 }
865
866 if (WARN_ON(rdev->sched_scan_req &&
867 rdev->sched_scan_req->dev == wdev->netdev)) {
868 __cfg80211_stop_sched_scan(rdev, false);
869 }
870
871 rdev->opencount--;
872 wake_up(&rdev->dev_wait);
873 break;
874 case NETDEV_UP:
875 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
876 wdev_lock(wdev);
877 switch (wdev->iftype) {
878#ifdef CONFIG_CFG80211_WEXT
879 case NL80211_IFTYPE_ADHOC:
880 cfg80211_ibss_wext_join(rdev, wdev);
881 break;
882 case NL80211_IFTYPE_STATION:
883 cfg80211_mgd_wext_connect(rdev, wdev);
884 break;
885#endif
886#ifdef CONFIG_MAC80211_MESH
887 case NL80211_IFTYPE_MESH_POINT:
888 {
889 /* backward compat code... */
890 struct mesh_setup setup;
891 memcpy(&setup, &default_mesh_setup,
892 sizeof(setup));
893 /* back compat only needed for mesh_id */
894 setup.mesh_id = wdev->ssid;
895 setup.mesh_id_len = wdev->mesh_id_up_len;
896 if (wdev->mesh_id_up_len)
897 __cfg80211_join_mesh(rdev, dev,
898 &setup,
899 &default_mesh_config);
900 break;
901 }
902#endif
903 default:
904 break;
905 }
906 wdev_unlock(wdev);
907 rdev->opencount++;
908
909 /*
910 * Configure power management to the driver here so that its
911 * correctly set also after interface type changes etc.
912 */
913 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
914 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
915 rdev->ops->set_power_mgmt)
916 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
917 wdev->ps_timeout)) {
918 /* assume this means it's off */
919 wdev->ps = false;
920 }
921 break;
922 case NETDEV_UNREGISTER:
923 /*
924 * It is possible to get NETDEV_UNREGISTER
925 * multiple times. To detect that, check
926 * that the interface is still on the list
927 * of registered interfaces, and only then
928 * remove and clean it up.
929 */
930 if (!list_empty(&wdev->list)) {
931 sysfs_remove_link(&dev->dev.kobj, "phy80211");
932 list_del_rcu(&wdev->list);
933 rdev->devlist_generation++;
934 cfg80211_mlme_purge_registrations(wdev);
935#ifdef CONFIG_CFG80211_WEXT
936 kfree(wdev->wext.keys);
937#endif
938 }
939 /*
940 * synchronise (so that we won't find this netdev
941 * from other code any more) and then clear the list
942 * head so that the above code can safely check for
943 * !list_empty() to avoid double-cleanup.
944 */
945 synchronize_rcu();
946 INIT_LIST_HEAD(&wdev->list);
947 /*
948 * Ensure that all events have been processed and
949 * freed.
950 */
951 cfg80211_process_wdev_events(wdev);
952
953 if (WARN_ON(wdev->current_bss)) {
954 cfg80211_unhold_bss(wdev->current_bss);
955 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
956 wdev->current_bss = NULL;
957 }
958 break;
959 case NETDEV_PRE_UP:
960 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
961 return notifier_from_errno(-EOPNOTSUPP);
962 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
963 if (ret)
964 return notifier_from_errno(ret);
965 break;
966 }
967
968 return NOTIFY_DONE;
969}
970
971static struct notifier_block cfg80211_netdev_notifier = {
972 .notifier_call = cfg80211_netdev_notifier_call,
973};
974
975static void __net_exit cfg80211_pernet_exit(struct net *net)
976{
977 struct cfg80211_registered_device *rdev;
978
979 rtnl_lock();
980 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
981 if (net_eq(wiphy_net(&rdev->wiphy), net))
982 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
983 }
984 rtnl_unlock();
985}
986
987static struct pernet_operations cfg80211_pernet_ops = {
988 .exit = cfg80211_pernet_exit,
989};
990
991static int __init cfg80211_init(void)
992{
993 int err;
994
995 err = register_pernet_device(&cfg80211_pernet_ops);
996 if (err)
997 goto out_fail_pernet;
998
999 err = wiphy_sysfs_init();
1000 if (err)
1001 goto out_fail_sysfs;
1002
1003 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1004 if (err)
1005 goto out_fail_notifier;
1006
1007 err = nl80211_init();
1008 if (err)
1009 goto out_fail_nl80211;
1010
1011 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1012
1013 err = regulatory_init();
1014 if (err)
1015 goto out_fail_reg;
1016
1017 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1018 if (!cfg80211_wq) {
1019 err = -ENOMEM;
1020 goto out_fail_wq;
1021 }
1022
1023 return 0;
1024
1025out_fail_wq:
1026 regulatory_exit();
1027out_fail_reg:
1028 debugfs_remove(ieee80211_debugfs_dir);
1029out_fail_nl80211:
1030 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1031out_fail_notifier:
1032 wiphy_sysfs_exit();
1033out_fail_sysfs:
1034 unregister_pernet_device(&cfg80211_pernet_ops);
1035out_fail_pernet:
1036 return err;
1037}
1038subsys_initcall(cfg80211_init);
1039
1040static void __exit cfg80211_exit(void)
1041{
1042 debugfs_remove(ieee80211_debugfs_dir);
1043 nl80211_exit();
1044 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1045 wiphy_sysfs_exit();
1046 regulatory_exit();
1047 unregister_pernet_device(&cfg80211_pernet_ops);
1048 destroy_workqueue(cfg80211_wq);
1049}
1050module_exit(cfg80211_exit);
Linux 6.x block layer and io_uring tree(s)