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signal: Fix sending signals with siginfo
[cris-mirror.git] / net / wireless / core.c
blob7b33e8c366bc13b4fc9e2b4a72a3cf9dba14c92f
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 * Copyright 2015 Intel Deutschland GmbH
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/if.h>
12 #include <linux/module.h>
13 #include <linux/err.h>
14 #include <linux/list.h>
15 #include <linux/slab.h>
16 #include <linux/nl80211.h>
17 #include <linux/debugfs.h>
18 #include <linux/notifier.h>
19 #include <linux/device.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/sched.h>
23 #include <net/genetlink.h>
24 #include <net/cfg80211.h>
25 #include "nl80211.h"
26 #include "core.h"
27 #include "sysfs.h"
28 #include "debugfs.h"
29 #include "wext-compat.h"
30 #include "rdev-ops.h"
31
32 /* name for sysfs, %d is appended */
33 #define PHY_NAME "phy"
34
35 MODULE_AUTHOR("Johannes Berg");
36 MODULE_LICENSE("GPL");
37 MODULE_DESCRIPTION("wireless configuration support");
38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
39
40 /* RCU-protected (and RTNL for writers) */
41 LIST_HEAD(cfg80211_rdev_list);
42 int cfg80211_rdev_list_generation;
43
44 /* for debugfs */
45 static struct dentry *ieee80211_debugfs_dir;
46
47 /* for the cleanup, scan and event works */
48 struct workqueue_struct *cfg80211_wq;
49
50 static bool cfg80211_disable_40mhz_24ghz;
51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
53 "Disable 40MHz support in the 2.4GHz band");
54
55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
56 {
57 struct cfg80211_registered_device *result = NULL, *rdev;
58
59 ASSERT_RTNL();
60
61 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
62 if (rdev->wiphy_idx == wiphy_idx) {
63 result = rdev;
64 break;
65 }
66 }
67
68 return result;
69 }
70
71 int get_wiphy_idx(struct wiphy *wiphy)
72 {
73 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
74
75 return rdev->wiphy_idx;
76 }
77
78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
79 {
80 struct cfg80211_registered_device *rdev;
81
82 ASSERT_RTNL();
83
84 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
85 if (!rdev)
86 return NULL;
87 return &rdev->wiphy;
88 }
89
90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
91 const char *newname)
92 {
93 struct cfg80211_registered_device *rdev2;
94 int wiphy_idx, taken = -1, digits;
95
96 ASSERT_RTNL();
97
98 /* prohibit calling the thing phy%d when %d is not its number */
99 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
100 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
101 /* count number of places needed to print wiphy_idx */
102 digits = 1;
103 while (wiphy_idx /= 10)
104 digits++;
105 /*
106 * deny the name if it is phy<idx> where <idx> is printed
107 * without leading zeroes. taken == strlen(newname) here
108 */
109 if (taken == strlen(PHY_NAME) + digits)
110 return -EINVAL;
111 }
112
113 /* Ensure another device does not already have this name. */
114 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
115 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
116 return -EINVAL;
117
118 return 0;
119 }
120
121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
122 char *newname)
123 {
124 int result;
125
126 ASSERT_RTNL();
127
128 /* Ignore nop renames */
129 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
130 return 0;
131
132 result = cfg80211_dev_check_name(rdev, newname);
133 if (result < 0)
134 return result;
135
136 result = device_rename(&rdev->wiphy.dev, newname);
137 if (result)
138 return result;
139
140 if (rdev->wiphy.debugfsdir &&
141 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
142 rdev->wiphy.debugfsdir,
143 rdev->wiphy.debugfsdir->d_parent,
144 newname))
145 pr_err("failed to rename debugfs dir to %s!\n", newname);
146
147 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
148
149 return 0;
150 }
151
152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
153 struct net *net)
154 {
155 struct wireless_dev *wdev;
156 int err = 0;
157
158 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
159 return -EOPNOTSUPP;
160
161 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
162 if (!wdev->netdev)
163 continue;
164 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
165 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
166 if (err)
167 break;
168 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
169 }
170
171 if (err) {
172 /* failed -- clean up to old netns */
173 net = wiphy_net(&rdev->wiphy);
174
175 list_for_each_entry_continue_reverse(wdev,
176 &rdev->wiphy.wdev_list,
177 list) {
178 if (!wdev->netdev)
179 continue;
180 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
181 err = dev_change_net_namespace(wdev->netdev, net,
182 "wlan%d");
183 WARN_ON(err);
184 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
185 }
186
187 return err;
188 }
189
190 wiphy_net_set(&rdev->wiphy, net);
191
192 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
193 WARN_ON(err);
194
195 return 0;
196 }
197
198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
199 {
200 struct cfg80211_registered_device *rdev = data;
201
202 rdev_rfkill_poll(rdev);
203 }
204
205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
206 struct wireless_dev *wdev)
207 {
208 ASSERT_RTNL();
209
210 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
211 return;
212
213 if (!wdev_running(wdev))
214 return;
215
216 rdev_stop_p2p_device(rdev, wdev);
217 wdev->is_running = false;
218
219 rdev->opencount--;
220
221 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
222 if (WARN_ON(!rdev->scan_req->notified))
223 rdev->scan_req->info.aborted = true;
224 ___cfg80211_scan_done(rdev, false);
225 }
226 }
227
228 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
229 struct wireless_dev *wdev)
230 {
231 ASSERT_RTNL();
232
233 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
234 return;
235
236 if (!wdev_running(wdev))
237 return;
238
239 rdev_stop_nan(rdev, wdev);
240 wdev->is_running = false;
241
242 rdev->opencount--;
243 }
244
245 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
246 {
247 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
248 struct wireless_dev *wdev;
249
250 ASSERT_RTNL();
251
252 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
253 if (wdev->netdev) {
254 dev_close(wdev->netdev);
255 continue;
256 }
257 /* otherwise, check iftype */
258 switch (wdev->iftype) {
259 case NL80211_IFTYPE_P2P_DEVICE:
260 cfg80211_stop_p2p_device(rdev, wdev);
261 break;
262 case NL80211_IFTYPE_NAN:
263 cfg80211_stop_nan(rdev, wdev);
264 break;
265 default:
266 break;
267 }
268 }
269 }
270 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
271
272 static int cfg80211_rfkill_set_block(void *data, bool blocked)
273 {
274 struct cfg80211_registered_device *rdev = data;
275
276 if (!blocked)
277 return 0;
278
279 rtnl_lock();
280 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
281 rtnl_unlock();
282
283 return 0;
284 }
285
286 static void cfg80211_rfkill_sync_work(struct work_struct *work)
287 {
288 struct cfg80211_registered_device *rdev;
289
290 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
291 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
292 }
293
294 static void cfg80211_event_work(struct work_struct *work)
295 {
296 struct cfg80211_registered_device *rdev;
297
298 rdev = container_of(work, struct cfg80211_registered_device,
299 event_work);
300
301 rtnl_lock();
302 cfg80211_process_rdev_events(rdev);
303 rtnl_unlock();
304 }
305
306 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
307 {
308 struct wireless_dev *wdev, *tmp;
309
310 ASSERT_RTNL();
311
312 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
313 if (wdev->nl_owner_dead)
314 rdev_del_virtual_intf(rdev, wdev);
315 }
316 }
317
318 static void cfg80211_destroy_iface_wk(struct work_struct *work)
319 {
320 struct cfg80211_registered_device *rdev;
321
322 rdev = container_of(work, struct cfg80211_registered_device,
323 destroy_work);
324
325 rtnl_lock();
326 cfg80211_destroy_ifaces(rdev);
327 rtnl_unlock();
328 }
329
330 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
331 {
332 struct cfg80211_registered_device *rdev;
333 struct cfg80211_sched_scan_request *req, *tmp;
334
335 rdev = container_of(work, struct cfg80211_registered_device,
336 sched_scan_stop_wk);
337
338 rtnl_lock();
339 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
340 if (req->nl_owner_dead)
341 cfg80211_stop_sched_scan_req(rdev, req, false);
342 }
343 rtnl_unlock();
344 }
345
346 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
347 {
348 struct cfg80211_registered_device *rdev;
349
350 rdev = container_of(work, struct cfg80211_registered_device,
351 propagate_radar_detect_wk);
352
353 rtnl_lock();
354
355 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
356 NL80211_DFS_UNAVAILABLE,
357 NL80211_RADAR_DETECTED);
358
359 rtnl_unlock();
360 }
361
362 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
363 {
364 struct cfg80211_registered_device *rdev;
365
366 rdev = container_of(work, struct cfg80211_registered_device,
367 propagate_cac_done_wk);
368
369 rtnl_lock();
370
371 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
372 NL80211_DFS_AVAILABLE,
373 NL80211_RADAR_CAC_FINISHED);
374
375 rtnl_unlock();
376 }
377
378 /* exported functions */
379
380 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
381 const char *requested_name)
382 {
383 static atomic_t wiphy_counter = ATOMIC_INIT(0);
384
385 struct cfg80211_registered_device *rdev;
386 int alloc_size;
387
388 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
389 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
390 WARN_ON(ops->connect && !ops->disconnect);
391 WARN_ON(ops->join_ibss && !ops->leave_ibss);
392 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
393 WARN_ON(ops->add_station && !ops->del_station);
394 WARN_ON(ops->add_mpath && !ops->del_mpath);
395 WARN_ON(ops->join_mesh && !ops->leave_mesh);
396 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
397 WARN_ON(ops->start_ap && !ops->stop_ap);
398 WARN_ON(ops->join_ocb && !ops->leave_ocb);
399 WARN_ON(ops->suspend && !ops->resume);
400 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
401 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
402 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
403 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
404
405 alloc_size = sizeof(*rdev) + sizeof_priv;
406
407 rdev = kzalloc(alloc_size, GFP_KERNEL);
408 if (!rdev)
409 return NULL;
410
411 rdev->ops = ops;
412
413 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
414
415 if (unlikely(rdev->wiphy_idx < 0)) {
416 /* ugh, wrapped! */
417 atomic_dec(&wiphy_counter);
418 kfree(rdev);
419 return NULL;
420 }
421
422 /* atomic_inc_return makes it start at 1, make it start at 0 */
423 rdev->wiphy_idx--;
424
425 /* give it a proper name */
426 if (requested_name && requested_name[0]) {
427 int rv;
428
429 rtnl_lock();
430 rv = cfg80211_dev_check_name(rdev, requested_name);
431
432 if (rv < 0) {
433 rtnl_unlock();
434 goto use_default_name;
435 }
436
437 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
438 rtnl_unlock();
439 if (rv)
440 goto use_default_name;
441 } else {
442 use_default_name:
443 /* NOTE: This is *probably* safe w/out holding rtnl because of
444 * the restrictions on phy names. Probably this call could
445 * fail if some other part of the kernel (re)named a device
446 * phyX. But, might should add some locking and check return
447 * value, and use a different name if this one exists?
448 */
449 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
450 }
451
452 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
453 INIT_LIST_HEAD(&rdev->beacon_registrations);
454 spin_lock_init(&rdev->beacon_registrations_lock);
455 spin_lock_init(&rdev->bss_lock);
456 INIT_LIST_HEAD(&rdev->bss_list);
457 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
458 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
459 INIT_LIST_HEAD(&rdev->mlme_unreg);
460 spin_lock_init(&rdev->mlme_unreg_lock);
461 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
462 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
463 cfg80211_dfs_channels_update_work);
464 #ifdef CONFIG_CFG80211_WEXT
465 rdev->wiphy.wext = &cfg80211_wext_handler;
466 #endif
467
468 device_initialize(&rdev->wiphy.dev);
469 rdev->wiphy.dev.class = &ieee80211_class;
470 rdev->wiphy.dev.platform_data = rdev;
471 device_enable_async_suspend(&rdev->wiphy.dev);
472
473 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
474 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
475 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
476 INIT_WORK(&rdev->propagate_radar_detect_wk,
477 cfg80211_propagate_radar_detect_wk);
478 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
479
480 #ifdef CONFIG_CFG80211_DEFAULT_PS
481 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
482 #endif
483
484 wiphy_net_set(&rdev->wiphy, &init_net);
485
486 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
487 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
488 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
489 &rdev->rfkill_ops, rdev);
490
491 if (!rdev->rfkill) {
492 kfree(rdev);
493 return NULL;
494 }
495
496 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
497 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
498 INIT_WORK(&rdev->event_work, cfg80211_event_work);
499
500 init_waitqueue_head(&rdev->dev_wait);
501
502 /*
503 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
504 * Fragmentation and RTS threshold are disabled by default with the
505 * special -1 value.
506 */
507 rdev->wiphy.retry_short = 7;
508 rdev->wiphy.retry_long = 4;
509 rdev->wiphy.frag_threshold = (u32) -1;
510 rdev->wiphy.rts_threshold = (u32) -1;
511 rdev->wiphy.coverage_class = 0;
512
513 rdev->wiphy.max_num_csa_counters = 1;
514
515 rdev->wiphy.max_sched_scan_plans = 1;
516 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
517
518 return &rdev->wiphy;
519 }
520 EXPORT_SYMBOL(wiphy_new_nm);
521
522 static int wiphy_verify_combinations(struct wiphy *wiphy)
523 {
524 const struct ieee80211_iface_combination *c;
525 int i, j;
526
527 for (i = 0; i < wiphy->n_iface_combinations; i++) {
528 u32 cnt = 0;
529 u16 all_iftypes = 0;
530
531 c = &wiphy->iface_combinations[i];
532
533 /*
534 * Combinations with just one interface aren't real,
535 * however we make an exception for DFS.
536 */
537 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
538 return -EINVAL;
539
540 /* Need at least one channel */
541 if (WARN_ON(!c->num_different_channels))
542 return -EINVAL;
543
544 /*
545 * Put a sane limit on maximum number of different
546 * channels to simplify channel accounting code.
547 */
548 if (WARN_ON(c->num_different_channels >
549 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
550 return -EINVAL;
551
552 /* DFS only works on one channel. */
553 if (WARN_ON(c->radar_detect_widths &&
554 (c->num_different_channels > 1)))
555 return -EINVAL;
556
557 if (WARN_ON(!c->n_limits))
558 return -EINVAL;
559
560 for (j = 0; j < c->n_limits; j++) {
561 u16 types = c->limits[j].types;
562
563 /* interface types shouldn't overlap */
564 if (WARN_ON(types & all_iftypes))
565 return -EINVAL;
566 all_iftypes |= types;
567
568 if (WARN_ON(!c->limits[j].max))
569 return -EINVAL;
570
571 /* Shouldn't list software iftypes in combinations! */
572 if (WARN_ON(wiphy->software_iftypes & types))
573 return -EINVAL;
574
575 /* Only a single P2P_DEVICE can be allowed */
576 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
577 c->limits[j].max > 1))
578 return -EINVAL;
579
580 /* Only a single NAN can be allowed */
581 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
582 c->limits[j].max > 1))
583 return -EINVAL;
584
585 /*
586 * This isn't well-defined right now. If you have an
587 * IBSS interface, then its beacon interval may change
588 * by joining other networks, and nothing prevents it
589 * from doing that.
590 * So technically we probably shouldn't even allow AP
591 * and IBSS in the same interface, but it seems that
592 * some drivers support that, possibly only with fixed
593 * beacon intervals for IBSS.
594 */
595 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
596 c->beacon_int_min_gcd)) {
597 return -EINVAL;
598 }
599
600 cnt += c->limits[j].max;
601 /*
602 * Don't advertise an unsupported type
603 * in a combination.
604 */
605 if (WARN_ON((wiphy->interface_modes & types) != types))
606 return -EINVAL;
607 }
608
609 #ifndef CONFIG_WIRELESS_WDS
610 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
611 return -EINVAL;
612 #endif
613
614 /* You can't even choose that many! */
615 if (WARN_ON(cnt < c->max_interfaces))
616 return -EINVAL;
617 }
618
619 return 0;
620 }
621
622 int wiphy_register(struct wiphy *wiphy)
623 {
624 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
625 int res;
626 enum nl80211_band band;
627 struct ieee80211_supported_band *sband;
628 bool have_band = false;
629 int i;
630 u16 ifmodes = wiphy->interface_modes;
631
632 #ifdef CONFIG_PM
633 if (WARN_ON(wiphy->wowlan &&
634 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
635 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
636 return -EINVAL;
637 if (WARN_ON(wiphy->wowlan &&
638 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
639 !wiphy->wowlan->tcp))
640 return -EINVAL;
641 #endif
642 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
643 (!rdev->ops->tdls_channel_switch ||
644 !rdev->ops->tdls_cancel_channel_switch)))
645 return -EINVAL;
646
647 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
648 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
649 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
650 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
651 return -EINVAL;
652
653 #ifndef CONFIG_WIRELESS_WDS
654 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
655 return -EINVAL;
656 #endif
657
658 /*
659 * if a wiphy has unsupported modes for regulatory channel enforcement,
660 * opt-out of enforcement checking
661 */
662 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
663 BIT(NL80211_IFTYPE_P2P_CLIENT) |
664 BIT(NL80211_IFTYPE_AP) |
665 BIT(NL80211_IFTYPE_P2P_GO) |
666 BIT(NL80211_IFTYPE_ADHOC) |
667 BIT(NL80211_IFTYPE_P2P_DEVICE) |
668 BIT(NL80211_IFTYPE_NAN) |
669 BIT(NL80211_IFTYPE_AP_VLAN) |
670 BIT(NL80211_IFTYPE_MONITOR)))
671 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
672
673 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
674 (wiphy->regulatory_flags &
675 (REGULATORY_CUSTOM_REG |
676 REGULATORY_STRICT_REG |
677 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
678 REGULATORY_COUNTRY_IE_IGNORE))))
679 return -EINVAL;
680
681 if (WARN_ON(wiphy->coalesce &&
682 (!wiphy->coalesce->n_rules ||
683 !wiphy->coalesce->n_patterns) &&
684 (!wiphy->coalesce->pattern_min_len ||
685 wiphy->coalesce->pattern_min_len >
686 wiphy->coalesce->pattern_max_len)))
687 return -EINVAL;
688
689 if (WARN_ON(wiphy->ap_sme_capa &&
690 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
691 return -EINVAL;
692
693 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
694 return -EINVAL;
695
696 if (WARN_ON(wiphy->addresses &&
697 !is_zero_ether_addr(wiphy->perm_addr) &&
698 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
699 ETH_ALEN)))
700 return -EINVAL;
701
702 if (WARN_ON(wiphy->max_acl_mac_addrs &&
703 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
704 !rdev->ops->set_mac_acl)))
705 return -EINVAL;
706
707 /* assure only valid behaviours are flagged by driver
708 * hence subtract 2 as bit 0 is invalid.
709 */
710 if (WARN_ON(wiphy->bss_select_support &&
711 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
712 return -EINVAL;
713
714 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
715 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
716 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
717 return -EINVAL;
718
719 if (wiphy->addresses)
720 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
721
722 /* sanity check ifmodes */
723 WARN_ON(!ifmodes);
724 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
725 if (WARN_ON(ifmodes != wiphy->interface_modes))
726 wiphy->interface_modes = ifmodes;
727
728 res = wiphy_verify_combinations(wiphy);
729 if (res)
730 return res;
731
732 /* sanity check supported bands/channels */
733 for (band = 0; band < NUM_NL80211_BANDS; band++) {
734 sband = wiphy->bands[band];
735 if (!sband)
736 continue;
737
738 sband->band = band;
739 if (WARN_ON(!sband->n_channels))
740 return -EINVAL;
741 /*
742 * on 60GHz band, there are no legacy rates, so
743 * n_bitrates is 0
744 */
745 if (WARN_ON(band != NL80211_BAND_60GHZ &&
746 !sband->n_bitrates))
747 return -EINVAL;
748
749 /*
750 * Since cfg80211_disable_40mhz_24ghz is global, we can
751 * modify the sband's ht data even if the driver uses a
752 * global structure for that.
753 */
754 if (cfg80211_disable_40mhz_24ghz &&
755 band == NL80211_BAND_2GHZ &&
756 sband->ht_cap.ht_supported) {
757 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
758 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
759 }
760
761 /*
762 * Since we use a u32 for rate bitmaps in
763 * ieee80211_get_response_rate, we cannot
764 * have more than 32 legacy rates.
765 */
766 if (WARN_ON(sband->n_bitrates > 32))
767 return -EINVAL;
768
769 for (i = 0; i < sband->n_channels; i++) {
770 sband->channels[i].orig_flags =
771 sband->channels[i].flags;
772 sband->channels[i].orig_mag = INT_MAX;
773 sband->channels[i].orig_mpwr =
774 sband->channels[i].max_power;
775 sband->channels[i].band = band;
776 }
777
778 have_band = true;
779 }
780
781 if (!have_band) {
782 WARN_ON(1);
783 return -EINVAL;
784 }
785
786 #ifdef CONFIG_PM
787 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
788 (!rdev->wiphy.wowlan->pattern_min_len ||
789 rdev->wiphy.wowlan->pattern_min_len >
790 rdev->wiphy.wowlan->pattern_max_len)))
791 return -EINVAL;
792 #endif
793
794 /* check and set up bitrates */
795 ieee80211_set_bitrate_flags(wiphy);
796
797 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
798
799 rtnl_lock();
800 res = device_add(&rdev->wiphy.dev);
801 if (res) {
802 rtnl_unlock();
803 return res;
804 }
805
806 /* set up regulatory info */
807 wiphy_regulatory_register(wiphy);
808
809 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
810 cfg80211_rdev_list_generation++;
811
812 /* add to debugfs */
813 rdev->wiphy.debugfsdir =
814 debugfs_create_dir(wiphy_name(&rdev->wiphy),
815 ieee80211_debugfs_dir);
816 if (IS_ERR(rdev->wiphy.debugfsdir))
817 rdev->wiphy.debugfsdir = NULL;
818
819 cfg80211_debugfs_rdev_add(rdev);
820 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
821
822 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
823 struct regulatory_request request;
824
825 request.wiphy_idx = get_wiphy_idx(wiphy);
826 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
827 request.alpha2[0] = '9';
828 request.alpha2[1] = '9';
829
830 nl80211_send_reg_change_event(&request);
831 }
832
833 /* Check that nobody globally advertises any capabilities they do not
834 * advertise on all possible interface types.
835 */
836 if (wiphy->extended_capabilities_len &&
837 wiphy->num_iftype_ext_capab &&
838 wiphy->iftype_ext_capab) {
839 u8 supported_on_all, j;
840 const struct wiphy_iftype_ext_capab *capab;
841
842 capab = wiphy->iftype_ext_capab;
843 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
844 if (capab[0].extended_capabilities_len > j)
845 supported_on_all =
846 capab[0].extended_capabilities[j];
847 else
848 supported_on_all = 0x00;
849 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
850 if (j >= capab[i].extended_capabilities_len) {
851 supported_on_all = 0x00;
852 break;
853 }
854 supported_on_all &=
855 capab[i].extended_capabilities[j];
856 }
857 if (WARN_ON(wiphy->extended_capabilities[j] &
858 ~supported_on_all))
859 break;
860 }
861 }
862
863 rdev->wiphy.registered = true;
864 rtnl_unlock();
865
866 res = rfkill_register(rdev->rfkill);
867 if (res) {
868 rfkill_destroy(rdev->rfkill);
869 rdev->rfkill = NULL;
870 wiphy_unregister(&rdev->wiphy);
871 return res;
872 }
873
874 return 0;
875 }
876 EXPORT_SYMBOL(wiphy_register);
877
878 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
879 {
880 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
881
882 if (!rdev->ops->rfkill_poll)
883 return;
884 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
885 rfkill_resume_polling(rdev->rfkill);
886 }
887 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
888
889 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
890 {
891 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
892
893 rfkill_pause_polling(rdev->rfkill);
894 }
895 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
896
897 void wiphy_unregister(struct wiphy *wiphy)
898 {
899 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
900
901 wait_event(rdev->dev_wait, ({
902 int __count;
903 rtnl_lock();
904 __count = rdev->opencount;
905 rtnl_unlock();
906 __count == 0; }));
907
908 if (rdev->rfkill)
909 rfkill_unregister(rdev->rfkill);
910
911 rtnl_lock();
912 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
913 rdev->wiphy.registered = false;
914
915 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
916
917 /*
918 * First remove the hardware from everywhere, this makes
919 * it impossible to find from userspace.
920 */
921 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
922 list_del_rcu(&rdev->list);
923 synchronize_rcu();
924
925 /*
926 * If this device got a regulatory hint tell core its
927 * free to listen now to a new shiny device regulatory hint
928 */
929 wiphy_regulatory_deregister(wiphy);
930
931 cfg80211_rdev_list_generation++;
932 device_del(&rdev->wiphy.dev);
933
934 rtnl_unlock();
935
936 flush_work(&rdev->scan_done_wk);
937 cancel_work_sync(&rdev->conn_work);
938 flush_work(&rdev->event_work);
939 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
940 flush_work(&rdev->destroy_work);
941 flush_work(&rdev->sched_scan_stop_wk);
942 flush_work(&rdev->mlme_unreg_wk);
943 flush_work(&rdev->propagate_radar_detect_wk);
944 flush_work(&rdev->propagate_cac_done_wk);
945
946 #ifdef CONFIG_PM
947 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
948 rdev_set_wakeup(rdev, false);
949 #endif
950 cfg80211_rdev_free_wowlan(rdev);
951 cfg80211_rdev_free_coalesce(rdev);
952 }
953 EXPORT_SYMBOL(wiphy_unregister);
954
955 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
956 {
957 struct cfg80211_internal_bss *scan, *tmp;
958 struct cfg80211_beacon_registration *reg, *treg;
959 rfkill_destroy(rdev->rfkill);
960 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
961 list_del(&reg->list);
962 kfree(reg);
963 }
964 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
965 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
966 kfree(rdev);
967 }
968
969 void wiphy_free(struct wiphy *wiphy)
970 {
971 put_device(&wiphy->dev);
972 }
973 EXPORT_SYMBOL(wiphy_free);
974
975 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
976 {
977 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
978
979 if (rfkill_set_hw_state(rdev->rfkill, blocked))
980 schedule_work(&rdev->rfkill_sync);
981 }
982 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
983
984 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
985 {
986 kfree(wdev->cqm_config);
987 wdev->cqm_config = NULL;
988 }
989
990 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
991 {
992 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
993
994 ASSERT_RTNL();
995
996 if (WARN_ON(wdev->netdev))
997 return;
998
999 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1000
1001 list_del_rcu(&wdev->list);
1002 rdev->devlist_generation++;
1003
1004 switch (wdev->iftype) {
1005 case NL80211_IFTYPE_P2P_DEVICE:
1006 cfg80211_mlme_purge_registrations(wdev);
1007 cfg80211_stop_p2p_device(rdev, wdev);
1008 break;
1009 case NL80211_IFTYPE_NAN:
1010 cfg80211_stop_nan(rdev, wdev);
1011 break;
1012 default:
1013 WARN_ON_ONCE(1);
1014 break;
1015 }
1016
1017 cfg80211_cqm_config_free(wdev);
1018 }
1019 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1020
1021 static const struct device_type wiphy_type = {
1022 .name = "wlan",
1023 };
1024
1025 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1026 enum nl80211_iftype iftype, int num)
1027 {
1028 ASSERT_RTNL();
1029
1030 rdev->num_running_ifaces += num;
1031 if (iftype == NL80211_IFTYPE_MONITOR)
1032 rdev->num_running_monitor_ifaces += num;
1033 }
1034
1035 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1036 struct wireless_dev *wdev)
1037 {
1038 struct net_device *dev = wdev->netdev;
1039 struct cfg80211_sched_scan_request *pos, *tmp;
1040
1041 ASSERT_RTNL();
1042 ASSERT_WDEV_LOCK(wdev);
1043
1044 switch (wdev->iftype) {
1045 case NL80211_IFTYPE_ADHOC:
1046 __cfg80211_leave_ibss(rdev, dev, true);
1047 break;
1048 case NL80211_IFTYPE_P2P_CLIENT:
1049 case NL80211_IFTYPE_STATION:
1050 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1051 list) {
1052 if (dev == pos->dev)
1053 cfg80211_stop_sched_scan_req(rdev, pos, false);
1054 }
1055
1056 #ifdef CONFIG_CFG80211_WEXT
1057 kfree(wdev->wext.ie);
1058 wdev->wext.ie = NULL;
1059 wdev->wext.ie_len = 0;
1060 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1061 #endif
1062 cfg80211_disconnect(rdev, dev,
1063 WLAN_REASON_DEAUTH_LEAVING, true);
1064 break;
1065 case NL80211_IFTYPE_MESH_POINT:
1066 __cfg80211_leave_mesh(rdev, dev);
1067 break;
1068 case NL80211_IFTYPE_AP:
1069 case NL80211_IFTYPE_P2P_GO:
1070 __cfg80211_stop_ap(rdev, dev, true);
1071 break;
1072 case NL80211_IFTYPE_OCB:
1073 __cfg80211_leave_ocb(rdev, dev);
1074 break;
1075 case NL80211_IFTYPE_WDS:
1076 /* must be handled by mac80211/driver, has no APIs */
1077 break;
1078 case NL80211_IFTYPE_P2P_DEVICE:
1079 case NL80211_IFTYPE_NAN:
1080 /* cannot happen, has no netdev */
1081 break;
1082 case NL80211_IFTYPE_AP_VLAN:
1083 case NL80211_IFTYPE_MONITOR:
1084 /* nothing to do */
1085 break;
1086 case NL80211_IFTYPE_UNSPECIFIED:
1087 case NUM_NL80211_IFTYPES:
1088 /* invalid */
1089 break;
1090 }
1091 }
1092
1093 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1094 struct wireless_dev *wdev)
1095 {
1096 wdev_lock(wdev);
1097 __cfg80211_leave(rdev, wdev);
1098 wdev_unlock(wdev);
1099 }
1100
1101 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1102 gfp_t gfp)
1103 {
1104 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1105 struct cfg80211_event *ev;
1106 unsigned long flags;
1107
1108 trace_cfg80211_stop_iface(wiphy, wdev);
1109
1110 ev = kzalloc(sizeof(*ev), gfp);
1111 if (!ev)
1112 return;
1113
1114 ev->type = EVENT_STOPPED;
1115
1116 spin_lock_irqsave(&wdev->event_lock, flags);
1117 list_add_tail(&ev->list, &wdev->event_list);
1118 spin_unlock_irqrestore(&wdev->event_lock, flags);
1119 queue_work(cfg80211_wq, &rdev->event_work);
1120 }
1121 EXPORT_SYMBOL(cfg80211_stop_iface);
1122
1123 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1124 unsigned long state, void *ptr)
1125 {
1126 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1127 struct wireless_dev *wdev = dev->ieee80211_ptr;
1128 struct cfg80211_registered_device *rdev;
1129 struct cfg80211_sched_scan_request *pos, *tmp;
1130
1131 if (!wdev)
1132 return NOTIFY_DONE;
1133
1134 rdev = wiphy_to_rdev(wdev->wiphy);
1135
1136 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1137
1138 switch (state) {
1139 case NETDEV_POST_INIT:
1140 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1141 break;
1142 case NETDEV_REGISTER:
1143 /*
1144 * NB: cannot take rdev->mtx here because this may be
1145 * called within code protected by it when interfaces
1146 * are added with nl80211.
1147 */
1148 mutex_init(&wdev->mtx);
1149 INIT_LIST_HEAD(&wdev->event_list);
1150 spin_lock_init(&wdev->event_lock);
1151 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1152 spin_lock_init(&wdev->mgmt_registrations_lock);
1153
1154 /*
1155 * We get here also when the interface changes network namespaces,
1156 * as it's registered into the new one, but we don't want it to
1157 * change ID in that case. Checking if the ID is already assigned
1158 * works, because 0 isn't considered a valid ID and the memory is
1159 * 0-initialized.
1160 */
1161 if (!wdev->identifier)
1162 wdev->identifier = ++rdev->wdev_id;
1163 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1164 rdev->devlist_generation++;
1165 /* can only change netns with wiphy */
1166 dev->features |= NETIF_F_NETNS_LOCAL;
1167
1168 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1169 "phy80211")) {
1170 pr_err("failed to add phy80211 symlink to netdev!\n");
1171 }
1172 wdev->netdev = dev;
1173 #ifdef CONFIG_CFG80211_WEXT
1174 wdev->wext.default_key = -1;
1175 wdev->wext.default_mgmt_key = -1;
1176 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1177 #endif
1178
1179 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1180 wdev->ps = true;
1181 else
1182 wdev->ps = false;
1183 /* allow mac80211 to determine the timeout */
1184 wdev->ps_timeout = -1;
1185
1186 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1187 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1188 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1189 dev->priv_flags |= IFF_DONT_BRIDGE;
1190
1191 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1192
1193 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1194 break;
1195 case NETDEV_GOING_DOWN:
1196 cfg80211_leave(rdev, wdev);
1197 break;
1198 case NETDEV_DOWN:
1199 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1200 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1201 if (WARN_ON(!rdev->scan_req->notified))
1202 rdev->scan_req->info.aborted = true;
1203 ___cfg80211_scan_done(rdev, false);
1204 }
1205
1206 list_for_each_entry_safe(pos, tmp,
1207 &rdev->sched_scan_req_list, list) {
1208 if (WARN_ON(pos && pos->dev == wdev->netdev))
1209 cfg80211_stop_sched_scan_req(rdev, pos, false);
1210 }
1211
1212 rdev->opencount--;
1213 wake_up(&rdev->dev_wait);
1214 break;
1215 case NETDEV_UP:
1216 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1217 wdev_lock(wdev);
1218 switch (wdev->iftype) {
1219 #ifdef CONFIG_CFG80211_WEXT
1220 case NL80211_IFTYPE_ADHOC:
1221 cfg80211_ibss_wext_join(rdev, wdev);
1222 break;
1223 case NL80211_IFTYPE_STATION:
1224 cfg80211_mgd_wext_connect(rdev, wdev);
1225 break;
1226 #endif
1227 #ifdef CONFIG_MAC80211_MESH
1228 case NL80211_IFTYPE_MESH_POINT:
1229 {
1230 /* backward compat code... */
1231 struct mesh_setup setup;
1232 memcpy(&setup, &default_mesh_setup,
1233 sizeof(setup));
1234 /* back compat only needed for mesh_id */
1235 setup.mesh_id = wdev->ssid;
1236 setup.mesh_id_len = wdev->mesh_id_up_len;
1237 if (wdev->mesh_id_up_len)
1238 __cfg80211_join_mesh(rdev, dev,
1239 &setup,
1240 &default_mesh_config);
1241 break;
1242 }
1243 #endif
1244 default:
1245 break;
1246 }
1247 wdev_unlock(wdev);
1248 rdev->opencount++;
1249
1250 /*
1251 * Configure power management to the driver here so that its
1252 * correctly set also after interface type changes etc.
1253 */
1254 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1255 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1256 rdev->ops->set_power_mgmt &&
1257 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1258 wdev->ps_timeout)) {
1259 /* assume this means it's off */
1260 wdev->ps = false;
1261 }
1262 break;
1263 case NETDEV_UNREGISTER:
1264 /*
1265 * It is possible to get NETDEV_UNREGISTER
1266 * multiple times. To detect that, check
1267 * that the interface is still on the list
1268 * of registered interfaces, and only then
1269 * remove and clean it up.
1270 */
1271 if (!list_empty(&wdev->list)) {
1272 nl80211_notify_iface(rdev, wdev,
1273 NL80211_CMD_DEL_INTERFACE);
1274 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1275 list_del_rcu(&wdev->list);
1276 rdev->devlist_generation++;
1277 cfg80211_mlme_purge_registrations(wdev);
1278 #ifdef CONFIG_CFG80211_WEXT
1279 kzfree(wdev->wext.keys);
1280 #endif
1281 flush_work(&wdev->disconnect_wk);
1282 cfg80211_cqm_config_free(wdev);
1283 }
1284 /*
1285 * synchronise (so that we won't find this netdev
1286 * from other code any more) and then clear the list
1287 * head so that the above code can safely check for
1288 * !list_empty() to avoid double-cleanup.
1289 */
1290 synchronize_rcu();
1291 INIT_LIST_HEAD(&wdev->list);
1292 /*
1293 * Ensure that all events have been processed and
1294 * freed.
1295 */
1296 cfg80211_process_wdev_events(wdev);
1297
1298 if (WARN_ON(wdev->current_bss)) {
1299 cfg80211_unhold_bss(wdev->current_bss);
1300 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1301 wdev->current_bss = NULL;
1302 }
1303 break;
1304 case NETDEV_PRE_UP:
1305 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1306 return notifier_from_errno(-EOPNOTSUPP);
1307 if (rfkill_blocked(rdev->rfkill))
1308 return notifier_from_errno(-ERFKILL);
1309 break;
1310 default:
1311 return NOTIFY_DONE;
1312 }
1313
1314 wireless_nlevent_flush();
1315
1316 return NOTIFY_OK;
1317 }
1318
1319 static struct notifier_block cfg80211_netdev_notifier = {
1320 .notifier_call = cfg80211_netdev_notifier_call,
1321 };
1322
1323 static void __net_exit cfg80211_pernet_exit(struct net *net)
1324 {
1325 struct cfg80211_registered_device *rdev;
1326
1327 rtnl_lock();
1328 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1329 if (net_eq(wiphy_net(&rdev->wiphy), net))
1330 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1331 }
1332 rtnl_unlock();
1333 }
1334
1335 static struct pernet_operations cfg80211_pernet_ops = {
1336 .exit = cfg80211_pernet_exit,
1337 };
1338
1339 static int __init cfg80211_init(void)
1340 {
1341 int err;
1342
1343 err = register_pernet_device(&cfg80211_pernet_ops);
1344 if (err)
1345 goto out_fail_pernet;
1346
1347 err = wiphy_sysfs_init();
1348 if (err)
1349 goto out_fail_sysfs;
1350
1351 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1352 if (err)
1353 goto out_fail_notifier;
1354
1355 err = nl80211_init();
1356 if (err)
1357 goto out_fail_nl80211;
1358
1359 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1360
1361 err = regulatory_init();
1362 if (err)
1363 goto out_fail_reg;
1364
1365 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1366 if (!cfg80211_wq) {
1367 err = -ENOMEM;
1368 goto out_fail_wq;
1369 }
1370
1371 return 0;
1372
1373 out_fail_wq:
1374 regulatory_exit();
1375 out_fail_reg:
1376 debugfs_remove(ieee80211_debugfs_dir);
1377 nl80211_exit();
1378 out_fail_nl80211:
1379 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1380 out_fail_notifier:
1381 wiphy_sysfs_exit();
1382 out_fail_sysfs:
1383 unregister_pernet_device(&cfg80211_pernet_ops);
1384 out_fail_pernet:
1385 return err;
1386 }
1387 subsys_initcall(cfg80211_init);
1388
1389 static void __exit cfg80211_exit(void)
1390 {
1391 debugfs_remove(ieee80211_debugfs_dir);
1392 nl80211_exit();
1393 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1394 wiphy_sysfs_exit();
1395 regulatory_exit();
1396 unregister_pernet_device(&cfg80211_pernet_ops);
1397 destroy_workqueue(cfg80211_wq);
1398 }
1399 module_exit(cfg80211_exit);
CRIS linux kernel tree