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 2015-2017 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
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)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
get_wiphy_idx(struct wiphy * wiphy)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
wiphy_idx_to_wiphy(int wiphy_idx)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
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)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 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
99 return -EINVAL;
100
101 /* prohibit calling the thing phy%d when %d is not its number */
102 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
103 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
104 /* count number of places needed to print wiphy_idx */
105 digits = 1;
106 while (wiphy_idx /= 10)
107 digits++;
108 /*
109 * deny the name if it is phy<idx> where <idx> is printed
110 * without leading zeroes. taken == strlen(newname) here
111 */
112 if (taken == strlen(PHY_NAME) + digits)
113 return -EINVAL;
114 }
115
116 /* Ensure another device does not already have this name. */
117 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
118 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
119 return -EINVAL;
120
121 return 0;
122 }
123
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)124 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
125 char *newname)
126 {
127 int result;
128
129 ASSERT_RTNL();
130
131 /* Ignore nop renames */
132 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
133 return 0;
134
135 result = cfg80211_dev_check_name(rdev, newname);
136 if (result < 0)
137 return result;
138
139 result = device_rename(&rdev->wiphy.dev, newname);
140 if (result)
141 return result;
142
143 if (rdev->wiphy.debugfsdir &&
144 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
145 rdev->wiphy.debugfsdir,
146 rdev->wiphy.debugfsdir->d_parent,
147 newname))
148 pr_err("failed to rename debugfs dir to %s!\n", newname);
149
150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
151
152 return 0;
153 }
154
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
156 struct net *net)
157 {
158 struct wireless_dev *wdev;
159 int err = 0;
160
161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
162 return -EOPNOTSUPP;
163
164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
165 if (!wdev->netdev)
166 continue;
167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
169 if (err)
170 break;
171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
172 }
173
174 if (err) {
175 /* failed -- clean up to old netns */
176 net = wiphy_net(&rdev->wiphy);
177
178 list_for_each_entry_continue_reverse(wdev,
179 &rdev->wiphy.wdev_list,
180 list) {
181 if (!wdev->netdev)
182 continue;
183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
184 err = dev_change_net_namespace(wdev->netdev, net,
185 "wlan%d");
186 WARN_ON(err);
187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
188 }
189
190 return err;
191 }
192
193 wiphy_net_set(&rdev->wiphy, net);
194
195 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
196 WARN_ON(err);
197
198 return 0;
199 }
200
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)201 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
202 {
203 struct cfg80211_registered_device *rdev = data;
204
205 rdev_rfkill_poll(rdev);
206 }
207
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)208 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
209 struct wireless_dev *wdev)
210 {
211 ASSERT_RTNL();
212
213 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
214 return;
215
216 if (!wdev_running(wdev))
217 return;
218
219 rdev_stop_p2p_device(rdev, wdev);
220 wdev->is_running = false;
221
222 rdev->opencount--;
223
224 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
225 if (WARN_ON(!rdev->scan_req->notified))
226 rdev->scan_req->info.aborted = true;
227 ___cfg80211_scan_done(rdev, false);
228 }
229 }
230
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)231 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
232 struct wireless_dev *wdev)
233 {
234 ASSERT_RTNL();
235
236 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
237 return;
238
239 if (!wdev_running(wdev))
240 return;
241
242 rdev_stop_nan(rdev, wdev);
243 wdev->is_running = false;
244
245 rdev->opencount--;
246 }
247
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)248 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
249 {
250 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
251 struct wireless_dev *wdev;
252
253 ASSERT_RTNL();
254
255 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
256 if (wdev->netdev) {
257 dev_close(wdev->netdev);
258 continue;
259 }
260 /* otherwise, check iftype */
261 switch (wdev->iftype) {
262 case NL80211_IFTYPE_P2P_DEVICE:
263 cfg80211_stop_p2p_device(rdev, wdev);
264 break;
265 case NL80211_IFTYPE_NAN:
266 cfg80211_stop_nan(rdev, wdev);
267 break;
268 default:
269 break;
270 }
271 }
272 }
273 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
274
cfg80211_rfkill_set_block(void * data,bool blocked)275 static int cfg80211_rfkill_set_block(void *data, bool blocked)
276 {
277 struct cfg80211_registered_device *rdev = data;
278
279 if (!blocked)
280 return 0;
281
282 rtnl_lock();
283 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
284 rtnl_unlock();
285
286 return 0;
287 }
288
cfg80211_rfkill_sync_work(struct work_struct * work)289 static void cfg80211_rfkill_sync_work(struct work_struct *work)
290 {
291 struct cfg80211_registered_device *rdev;
292
293 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
294 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
295 }
296
cfg80211_event_work(struct work_struct * work)297 static void cfg80211_event_work(struct work_struct *work)
298 {
299 struct cfg80211_registered_device *rdev;
300
301 rdev = container_of(work, struct cfg80211_registered_device,
302 event_work);
303
304 rtnl_lock();
305 cfg80211_process_rdev_events(rdev);
306 rtnl_unlock();
307 }
308
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)309 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
310 {
311 struct wireless_dev *wdev, *tmp;
312
313 ASSERT_RTNL();
314
315 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
316 if (wdev->nl_owner_dead)
317 rdev_del_virtual_intf(rdev, wdev);
318 }
319 }
320
cfg80211_destroy_iface_wk(struct work_struct * work)321 static void cfg80211_destroy_iface_wk(struct work_struct *work)
322 {
323 struct cfg80211_registered_device *rdev;
324
325 rdev = container_of(work, struct cfg80211_registered_device,
326 destroy_work);
327
328 rtnl_lock();
329 cfg80211_destroy_ifaces(rdev);
330 rtnl_unlock();
331 }
332
cfg80211_sched_scan_stop_wk(struct work_struct * work)333 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
334 {
335 struct cfg80211_registered_device *rdev;
336 struct cfg80211_sched_scan_request *req, *tmp;
337
338 rdev = container_of(work, struct cfg80211_registered_device,
339 sched_scan_stop_wk);
340
341 rtnl_lock();
342 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
343 if (req->nl_owner_dead)
344 cfg80211_stop_sched_scan_req(rdev, req, false);
345 }
346 rtnl_unlock();
347 }
348
cfg80211_propagate_radar_detect_wk(struct work_struct * work)349 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
350 {
351 struct cfg80211_registered_device *rdev;
352
353 rdev = container_of(work, struct cfg80211_registered_device,
354 propagate_radar_detect_wk);
355
356 rtnl_lock();
357
358 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
359 NL80211_DFS_UNAVAILABLE,
360 NL80211_RADAR_DETECTED);
361
362 rtnl_unlock();
363 }
364
cfg80211_propagate_cac_done_wk(struct work_struct * work)365 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
366 {
367 struct cfg80211_registered_device *rdev;
368
369 rdev = container_of(work, struct cfg80211_registered_device,
370 propagate_cac_done_wk);
371
372 rtnl_lock();
373
374 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
375 NL80211_DFS_AVAILABLE,
376 NL80211_RADAR_CAC_FINISHED);
377
378 rtnl_unlock();
379 }
380
381 /* exported functions */
382
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)383 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
384 const char *requested_name)
385 {
386 static atomic_t wiphy_counter = ATOMIC_INIT(0);
387
388 struct cfg80211_registered_device *rdev;
389 int alloc_size;
390
391 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
392 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
393 WARN_ON(ops->connect && !ops->disconnect);
394 WARN_ON(ops->join_ibss && !ops->leave_ibss);
395 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
396 WARN_ON(ops->add_station && !ops->del_station);
397 WARN_ON(ops->add_mpath && !ops->del_mpath);
398 WARN_ON(ops->join_mesh && !ops->leave_mesh);
399 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
400 WARN_ON(ops->start_ap && !ops->stop_ap);
401 WARN_ON(ops->join_ocb && !ops->leave_ocb);
402 WARN_ON(ops->suspend && !ops->resume);
403 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
404 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
405 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
406 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
407
408 alloc_size = sizeof(*rdev) + sizeof_priv;
409
410 rdev = kzalloc(alloc_size, GFP_KERNEL);
411 if (!rdev)
412 return NULL;
413
414 rdev->ops = ops;
415
416 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
417
418 if (unlikely(rdev->wiphy_idx < 0)) {
419 /* ugh, wrapped! */
420 atomic_dec(&wiphy_counter);
421 kfree(rdev);
422 return NULL;
423 }
424
425 /* atomic_inc_return makes it start at 1, make it start at 0 */
426 rdev->wiphy_idx--;
427
428 /* give it a proper name */
429 if (requested_name && requested_name[0]) {
430 int rv;
431
432 rtnl_lock();
433 rv = cfg80211_dev_check_name(rdev, requested_name);
434
435 if (rv < 0) {
436 rtnl_unlock();
437 goto use_default_name;
438 }
439
440 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
441 rtnl_unlock();
442 if (rv)
443 goto use_default_name;
444 } else {
445 int rv;
446
447 use_default_name:
448 /* NOTE: This is *probably* safe w/out holding rtnl because of
449 * the restrictions on phy names. Probably this call could
450 * fail if some other part of the kernel (re)named a device
451 * phyX. But, might should add some locking and check return
452 * value, and use a different name if this one exists?
453 */
454 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
455 if (rv < 0) {
456 kfree(rdev);
457 return NULL;
458 }
459 }
460
461 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
462 INIT_LIST_HEAD(&rdev->beacon_registrations);
463 spin_lock_init(&rdev->beacon_registrations_lock);
464 spin_lock_init(&rdev->bss_lock);
465 INIT_LIST_HEAD(&rdev->bss_list);
466 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
467 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
468 INIT_LIST_HEAD(&rdev->mlme_unreg);
469 spin_lock_init(&rdev->mlme_unreg_lock);
470 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
471 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
472 cfg80211_dfs_channels_update_work);
473 #ifdef CONFIG_CFG80211_WEXT
474 rdev->wiphy.wext = &cfg80211_wext_handler;
475 #endif
476
477 device_initialize(&rdev->wiphy.dev);
478 rdev->wiphy.dev.class = &ieee80211_class;
479 rdev->wiphy.dev.platform_data = rdev;
480 device_enable_async_suspend(&rdev->wiphy.dev);
481
482 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
483 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
484 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
485 INIT_WORK(&rdev->propagate_radar_detect_wk,
486 cfg80211_propagate_radar_detect_wk);
487 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
488
489 #ifdef CONFIG_CFG80211_DEFAULT_PS
490 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
491 #endif
492
493 wiphy_net_set(&rdev->wiphy, &init_net);
494
495 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
496 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
497 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
498 &rdev->rfkill_ops, rdev);
499
500 if (!rdev->rfkill) {
501 kfree(rdev);
502 return NULL;
503 }
504
505 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
506 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
507 INIT_WORK(&rdev->event_work, cfg80211_event_work);
508
509 init_waitqueue_head(&rdev->dev_wait);
510
511 /*
512 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
513 * Fragmentation and RTS threshold are disabled by default with the
514 * special -1 value.
515 */
516 rdev->wiphy.retry_short = 7;
517 rdev->wiphy.retry_long = 4;
518 rdev->wiphy.frag_threshold = (u32) -1;
519 rdev->wiphy.rts_threshold = (u32) -1;
520 rdev->wiphy.coverage_class = 0;
521
522 rdev->wiphy.max_num_csa_counters = 1;
523
524 rdev->wiphy.max_sched_scan_plans = 1;
525 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
526
527 return &rdev->wiphy;
528 }
529 EXPORT_SYMBOL(wiphy_new_nm);
530
wiphy_verify_combinations(struct wiphy * wiphy)531 static int wiphy_verify_combinations(struct wiphy *wiphy)
532 {
533 const struct ieee80211_iface_combination *c;
534 int i, j;
535
536 for (i = 0; i < wiphy->n_iface_combinations; i++) {
537 u32 cnt = 0;
538 u16 all_iftypes = 0;
539
540 c = &wiphy->iface_combinations[i];
541
542 /*
543 * Combinations with just one interface aren't real,
544 * however we make an exception for DFS.
545 */
546 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
547 return -EINVAL;
548
549 /* Need at least one channel */
550 if (WARN_ON(!c->num_different_channels))
551 return -EINVAL;
552
553 /*
554 * Put a sane limit on maximum number of different
555 * channels to simplify channel accounting code.
556 */
557 if (WARN_ON(c->num_different_channels >
558 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
559 return -EINVAL;
560
561 /* DFS only works on one channel. */
562 if (WARN_ON(c->radar_detect_widths &&
563 (c->num_different_channels > 1)))
564 return -EINVAL;
565
566 if (WARN_ON(!c->n_limits))
567 return -EINVAL;
568
569 for (j = 0; j < c->n_limits; j++) {
570 u16 types = c->limits[j].types;
571
572 /* interface types shouldn't overlap */
573 if (WARN_ON(types & all_iftypes))
574 return -EINVAL;
575 all_iftypes |= types;
576
577 if (WARN_ON(!c->limits[j].max))
578 return -EINVAL;
579
580 /* Shouldn't list software iftypes in combinations! */
581 if (WARN_ON(wiphy->software_iftypes & types))
582 return -EINVAL;
583
584 /* Only a single P2P_DEVICE can be allowed */
585 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
586 c->limits[j].max > 1))
587 return -EINVAL;
588
589 /* Only a single NAN can be allowed */
590 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
591 c->limits[j].max > 1))
592 return -EINVAL;
593
594 /*
595 * This isn't well-defined right now. If you have an
596 * IBSS interface, then its beacon interval may change
597 * by joining other networks, and nothing prevents it
598 * from doing that.
599 * So technically we probably shouldn't even allow AP
600 * and IBSS in the same interface, but it seems that
601 * some drivers support that, possibly only with fixed
602 * beacon intervals for IBSS.
603 */
604 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
605 c->beacon_int_min_gcd)) {
606 return -EINVAL;
607 }
608
609 cnt += c->limits[j].max;
610 /*
611 * Don't advertise an unsupported type
612 * in a combination.
613 */
614 if (WARN_ON((wiphy->interface_modes & types) != types))
615 return -EINVAL;
616 }
617
618 #ifndef CONFIG_WIRELESS_WDS
619 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
620 return -EINVAL;
621 #endif
622
623 /* You can't even choose that many! */
624 if (WARN_ON(cnt < c->max_interfaces))
625 return -EINVAL;
626 }
627
628 return 0;
629 }
630
wiphy_register(struct wiphy * wiphy)631 int wiphy_register(struct wiphy *wiphy)
632 {
633 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
634 int res;
635 enum nl80211_band band;
636 struct ieee80211_supported_band *sband;
637 bool have_band = false;
638 int i;
639 u16 ifmodes = wiphy->interface_modes;
640
641 #ifdef CONFIG_PM
642 if (WARN_ON(wiphy->wowlan &&
643 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
644 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
645 return -EINVAL;
646 if (WARN_ON(wiphy->wowlan &&
647 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
648 !wiphy->wowlan->tcp))
649 return -EINVAL;
650 #endif
651 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
652 (!rdev->ops->tdls_channel_switch ||
653 !rdev->ops->tdls_cancel_channel_switch)))
654 return -EINVAL;
655
656 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
657 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
658 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
659 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
660 return -EINVAL;
661
662 #ifndef CONFIG_WIRELESS_WDS
663 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
664 return -EINVAL;
665 #endif
666
667 /*
668 * if a wiphy has unsupported modes for regulatory channel enforcement,
669 * opt-out of enforcement checking
670 */
671 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
672 BIT(NL80211_IFTYPE_P2P_CLIENT) |
673 BIT(NL80211_IFTYPE_AP) |
674 BIT(NL80211_IFTYPE_P2P_GO) |
675 BIT(NL80211_IFTYPE_ADHOC) |
676 BIT(NL80211_IFTYPE_P2P_DEVICE) |
677 BIT(NL80211_IFTYPE_NAN) |
678 BIT(NL80211_IFTYPE_AP_VLAN) |
679 BIT(NL80211_IFTYPE_MONITOR)))
680 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
681
682 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
683 (wiphy->regulatory_flags &
684 (REGULATORY_CUSTOM_REG |
685 REGULATORY_STRICT_REG |
686 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
687 REGULATORY_COUNTRY_IE_IGNORE))))
688 return -EINVAL;
689
690 if (WARN_ON(wiphy->coalesce &&
691 (!wiphy->coalesce->n_rules ||
692 !wiphy->coalesce->n_patterns) &&
693 (!wiphy->coalesce->pattern_min_len ||
694 wiphy->coalesce->pattern_min_len >
695 wiphy->coalesce->pattern_max_len)))
696 return -EINVAL;
697
698 if (WARN_ON(wiphy->ap_sme_capa &&
699 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
700 return -EINVAL;
701
702 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
703 return -EINVAL;
704
705 if (WARN_ON(wiphy->addresses &&
706 !is_zero_ether_addr(wiphy->perm_addr) &&
707 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
708 ETH_ALEN)))
709 return -EINVAL;
710
711 if (WARN_ON(wiphy->max_acl_mac_addrs &&
712 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
713 !rdev->ops->set_mac_acl)))
714 return -EINVAL;
715
716 /* assure only valid behaviours are flagged by driver
717 * hence subtract 2 as bit 0 is invalid.
718 */
719 if (WARN_ON(wiphy->bss_select_support &&
720 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
721 return -EINVAL;
722
723 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
724 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
725 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
726 return -EINVAL;
727
728 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
729 rdev->ops->update_connect_params))
730 return -EINVAL;
731
732 if (wiphy->addresses)
733 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
734
735 /* sanity check ifmodes */
736 WARN_ON(!ifmodes);
737 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
738 if (WARN_ON(ifmodes != wiphy->interface_modes))
739 wiphy->interface_modes = ifmodes;
740
741 res = wiphy_verify_combinations(wiphy);
742 if (res)
743 return res;
744
745 /* sanity check supported bands/channels */
746 for (band = 0; band < NUM_NL80211_BANDS; band++) {
747 u16 types = 0;
748
749 sband = wiphy->bands[band];
750 if (!sband)
751 continue;
752
753 sband->band = band;
754 if (WARN_ON(!sband->n_channels))
755 return -EINVAL;
756 /*
757 * on 60GHz band, there are no legacy rates, so
758 * n_bitrates is 0
759 */
760 if (WARN_ON(band != NL80211_BAND_60GHZ &&
761 !sband->n_bitrates))
762 return -EINVAL;
763
764 /*
765 * Since cfg80211_disable_40mhz_24ghz is global, we can
766 * modify the sband's ht data even if the driver uses a
767 * global structure for that.
768 */
769 if (cfg80211_disable_40mhz_24ghz &&
770 band == NL80211_BAND_2GHZ &&
771 sband->ht_cap.ht_supported) {
772 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
773 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
774 }
775
776 /*
777 * Since we use a u32 for rate bitmaps in
778 * ieee80211_get_response_rate, we cannot
779 * have more than 32 legacy rates.
780 */
781 if (WARN_ON(sband->n_bitrates > 32))
782 return -EINVAL;
783
784 for (i = 0; i < sband->n_channels; i++) {
785 sband->channels[i].orig_flags =
786 sband->channels[i].flags;
787 sband->channels[i].orig_mag = INT_MAX;
788 sband->channels[i].orig_mpwr =
789 sband->channels[i].max_power;
790 sband->channels[i].band = band;
791 }
792
793 for (i = 0; i < sband->n_iftype_data; i++) {
794 const struct ieee80211_sband_iftype_data *iftd;
795
796 iftd = &sband->iftype_data[i];
797
798 if (WARN_ON(!iftd->types_mask))
799 return -EINVAL;
800 if (WARN_ON(types & iftd->types_mask))
801 return -EINVAL;
802
803 /* at least one piece of information must be present */
804 if (WARN_ON(!iftd->he_cap.has_he))
805 return -EINVAL;
806
807 types |= iftd->types_mask;
808 }
809
810 have_band = true;
811 }
812
813 if (!have_band) {
814 WARN_ON(1);
815 return -EINVAL;
816 }
817
818 #ifdef CONFIG_PM
819 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
820 (!rdev->wiphy.wowlan->pattern_min_len ||
821 rdev->wiphy.wowlan->pattern_min_len >
822 rdev->wiphy.wowlan->pattern_max_len)))
823 return -EINVAL;
824 #endif
825
826 /* check and set up bitrates */
827 ieee80211_set_bitrate_flags(wiphy);
828
829 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
830
831 rtnl_lock();
832 res = device_add(&rdev->wiphy.dev);
833 if (res) {
834 rtnl_unlock();
835 return res;
836 }
837
838 /* set up regulatory info */
839 wiphy_regulatory_register(wiphy);
840
841 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
842 cfg80211_rdev_list_generation++;
843
844 /* add to debugfs */
845 rdev->wiphy.debugfsdir =
846 debugfs_create_dir(wiphy_name(&rdev->wiphy),
847 ieee80211_debugfs_dir);
848 if (IS_ERR(rdev->wiphy.debugfsdir))
849 rdev->wiphy.debugfsdir = NULL;
850
851 cfg80211_debugfs_rdev_add(rdev);
852 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
853
854 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
855 struct regulatory_request request;
856
857 request.wiphy_idx = get_wiphy_idx(wiphy);
858 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
859 request.alpha2[0] = '9';
860 request.alpha2[1] = '9';
861
862 nl80211_send_reg_change_event(&request);
863 }
864
865 /* Check that nobody globally advertises any capabilities they do not
866 * advertise on all possible interface types.
867 */
868 if (wiphy->extended_capabilities_len &&
869 wiphy->num_iftype_ext_capab &&
870 wiphy->iftype_ext_capab) {
871 u8 supported_on_all, j;
872 const struct wiphy_iftype_ext_capab *capab;
873
874 capab = wiphy->iftype_ext_capab;
875 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
876 if (capab[0].extended_capabilities_len > j)
877 supported_on_all =
878 capab[0].extended_capabilities[j];
879 else
880 supported_on_all = 0x00;
881 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
882 if (j >= capab[i].extended_capabilities_len) {
883 supported_on_all = 0x00;
884 break;
885 }
886 supported_on_all &=
887 capab[i].extended_capabilities[j];
888 }
889 if (WARN_ON(wiphy->extended_capabilities[j] &
890 ~supported_on_all))
891 break;
892 }
893 }
894
895 rdev->wiphy.registered = true;
896 rtnl_unlock();
897
898 res = rfkill_register(rdev->rfkill);
899 if (res) {
900 rfkill_destroy(rdev->rfkill);
901 rdev->rfkill = NULL;
902 wiphy_unregister(&rdev->wiphy);
903 return res;
904 }
905
906 return 0;
907 }
908 EXPORT_SYMBOL(wiphy_register);
909
wiphy_rfkill_start_polling(struct wiphy * wiphy)910 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
911 {
912 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
913
914 if (!rdev->ops->rfkill_poll)
915 return;
916 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
917 rfkill_resume_polling(rdev->rfkill);
918 }
919 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
920
wiphy_rfkill_stop_polling(struct wiphy * wiphy)921 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
922 {
923 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
924
925 rfkill_pause_polling(rdev->rfkill);
926 }
927 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
928
wiphy_unregister(struct wiphy * wiphy)929 void wiphy_unregister(struct wiphy *wiphy)
930 {
931 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
932
933 wait_event(rdev->dev_wait, ({
934 int __count;
935 rtnl_lock();
936 __count = rdev->opencount;
937 rtnl_unlock();
938 __count == 0; }));
939
940 if (rdev->rfkill)
941 rfkill_unregister(rdev->rfkill);
942
943 rtnl_lock();
944 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
945 rdev->wiphy.registered = false;
946
947 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
948
949 /*
950 * First remove the hardware from everywhere, this makes
951 * it impossible to find from userspace.
952 */
953 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
954 list_del_rcu(&rdev->list);
955 synchronize_rcu();
956
957 /*
958 * If this device got a regulatory hint tell core its
959 * free to listen now to a new shiny device regulatory hint
960 */
961 wiphy_regulatory_deregister(wiphy);
962
963 cfg80211_rdev_list_generation++;
964 device_del(&rdev->wiphy.dev);
965
966 rtnl_unlock();
967
968 flush_work(&rdev->scan_done_wk);
969 cancel_work_sync(&rdev->conn_work);
970 flush_work(&rdev->event_work);
971 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
972 flush_work(&rdev->destroy_work);
973 flush_work(&rdev->sched_scan_stop_wk);
974 flush_work(&rdev->mlme_unreg_wk);
975 flush_work(&rdev->propagate_radar_detect_wk);
976 flush_work(&rdev->propagate_cac_done_wk);
977
978 #ifdef CONFIG_PM
979 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
980 rdev_set_wakeup(rdev, false);
981 #endif
982 cfg80211_rdev_free_wowlan(rdev);
983 cfg80211_rdev_free_coalesce(rdev);
984 }
985 EXPORT_SYMBOL(wiphy_unregister);
986
cfg80211_dev_free(struct cfg80211_registered_device * rdev)987 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
988 {
989 struct cfg80211_internal_bss *scan, *tmp;
990 struct cfg80211_beacon_registration *reg, *treg;
991 rfkill_destroy(rdev->rfkill);
992 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
993 list_del(®->list);
994 kfree(reg);
995 }
996 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
997 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
998 kfree(rdev);
999 }
1000
wiphy_free(struct wiphy * wiphy)1001 void wiphy_free(struct wiphy *wiphy)
1002 {
1003 put_device(&wiphy->dev);
1004 }
1005 EXPORT_SYMBOL(wiphy_free);
1006
wiphy_rfkill_set_hw_state(struct wiphy * wiphy,bool blocked)1007 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1008 {
1009 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1010
1011 if (rfkill_set_hw_state(rdev->rfkill, blocked))
1012 schedule_work(&rdev->rfkill_sync);
1013 }
1014 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1015
cfg80211_cqm_config_free(struct wireless_dev * wdev)1016 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1017 {
1018 kfree(wdev->cqm_config);
1019 wdev->cqm_config = NULL;
1020 }
1021
cfg80211_unregister_wdev(struct wireless_dev * wdev)1022 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1023 {
1024 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1025
1026 ASSERT_RTNL();
1027
1028 if (WARN_ON(wdev->netdev))
1029 return;
1030
1031 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1032
1033 list_del_rcu(&wdev->list);
1034 synchronize_rcu();
1035 rdev->devlist_generation++;
1036
1037 switch (wdev->iftype) {
1038 case NL80211_IFTYPE_P2P_DEVICE:
1039 cfg80211_mlme_purge_registrations(wdev);
1040 cfg80211_stop_p2p_device(rdev, wdev);
1041 break;
1042 case NL80211_IFTYPE_NAN:
1043 cfg80211_stop_nan(rdev, wdev);
1044 break;
1045 default:
1046 WARN_ON_ONCE(1);
1047 break;
1048 }
1049
1050 cfg80211_cqm_config_free(wdev);
1051 }
1052 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1053
1054 static const struct device_type wiphy_type = {
1055 .name = "wlan",
1056 };
1057
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1058 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1059 enum nl80211_iftype iftype, int num)
1060 {
1061 ASSERT_RTNL();
1062
1063 rdev->num_running_ifaces += num;
1064 if (iftype == NL80211_IFTYPE_MONITOR)
1065 rdev->num_running_monitor_ifaces += num;
1066 }
1067
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1068 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1069 struct wireless_dev *wdev)
1070 {
1071 struct net_device *dev = wdev->netdev;
1072 struct cfg80211_sched_scan_request *pos, *tmp;
1073
1074 ASSERT_RTNL();
1075 ASSERT_WDEV_LOCK(wdev);
1076
1077 switch (wdev->iftype) {
1078 case NL80211_IFTYPE_ADHOC:
1079 __cfg80211_leave_ibss(rdev, dev, true);
1080 break;
1081 case NL80211_IFTYPE_P2P_CLIENT:
1082 case NL80211_IFTYPE_STATION:
1083 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1084 list) {
1085 if (dev == pos->dev)
1086 cfg80211_stop_sched_scan_req(rdev, pos, false);
1087 }
1088
1089 #ifdef CONFIG_CFG80211_WEXT
1090 kfree(wdev->wext.ie);
1091 wdev->wext.ie = NULL;
1092 wdev->wext.ie_len = 0;
1093 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1094 #endif
1095 cfg80211_disconnect(rdev, dev,
1096 WLAN_REASON_DEAUTH_LEAVING, true);
1097 break;
1098 case NL80211_IFTYPE_MESH_POINT:
1099 __cfg80211_leave_mesh(rdev, dev);
1100 break;
1101 case NL80211_IFTYPE_AP:
1102 case NL80211_IFTYPE_P2P_GO:
1103 __cfg80211_stop_ap(rdev, dev, true);
1104 break;
1105 case NL80211_IFTYPE_OCB:
1106 __cfg80211_leave_ocb(rdev, dev);
1107 break;
1108 case NL80211_IFTYPE_WDS:
1109 /* must be handled by mac80211/driver, has no APIs */
1110 break;
1111 case NL80211_IFTYPE_P2P_DEVICE:
1112 case NL80211_IFTYPE_NAN:
1113 /* cannot happen, has no netdev */
1114 break;
1115 case NL80211_IFTYPE_AP_VLAN:
1116 case NL80211_IFTYPE_MONITOR:
1117 /* nothing to do */
1118 break;
1119 case NL80211_IFTYPE_UNSPECIFIED:
1120 case NUM_NL80211_IFTYPES:
1121 /* invalid */
1122 break;
1123 }
1124 }
1125
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1126 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1127 struct wireless_dev *wdev)
1128 {
1129 wdev_lock(wdev);
1130 __cfg80211_leave(rdev, wdev);
1131 wdev_unlock(wdev);
1132 }
1133
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1134 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1135 gfp_t gfp)
1136 {
1137 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1138 struct cfg80211_event *ev;
1139 unsigned long flags;
1140
1141 trace_cfg80211_stop_iface(wiphy, wdev);
1142
1143 ev = kzalloc(sizeof(*ev), gfp);
1144 if (!ev)
1145 return;
1146
1147 ev->type = EVENT_STOPPED;
1148
1149 spin_lock_irqsave(&wdev->event_lock, flags);
1150 list_add_tail(&ev->list, &wdev->event_list);
1151 spin_unlock_irqrestore(&wdev->event_lock, flags);
1152 queue_work(cfg80211_wq, &rdev->event_work);
1153 }
1154 EXPORT_SYMBOL(cfg80211_stop_iface);
1155
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1156 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1157 unsigned long state, void *ptr)
1158 {
1159 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1160 struct wireless_dev *wdev = dev->ieee80211_ptr;
1161 struct cfg80211_registered_device *rdev;
1162 struct cfg80211_sched_scan_request *pos, *tmp;
1163
1164 if (!wdev)
1165 return NOTIFY_DONE;
1166
1167 rdev = wiphy_to_rdev(wdev->wiphy);
1168
1169 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1170
1171 switch (state) {
1172 case NETDEV_POST_INIT:
1173 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1174 break;
1175 case NETDEV_REGISTER:
1176 /*
1177 * NB: cannot take rdev->mtx here because this may be
1178 * called within code protected by it when interfaces
1179 * are added with nl80211.
1180 */
1181 mutex_init(&wdev->mtx);
1182 INIT_LIST_HEAD(&wdev->event_list);
1183 spin_lock_init(&wdev->event_lock);
1184 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1185 spin_lock_init(&wdev->mgmt_registrations_lock);
1186
1187 /*
1188 * We get here also when the interface changes network namespaces,
1189 * as it's registered into the new one, but we don't want it to
1190 * change ID in that case. Checking if the ID is already assigned
1191 * works, because 0 isn't considered a valid ID and the memory is
1192 * 0-initialized.
1193 */
1194 if (!wdev->identifier)
1195 wdev->identifier = ++rdev->wdev_id;
1196 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1197 rdev->devlist_generation++;
1198 /* can only change netns with wiphy */
1199 dev->features |= NETIF_F_NETNS_LOCAL;
1200
1201 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1202 "phy80211")) {
1203 pr_err("failed to add phy80211 symlink to netdev!\n");
1204 }
1205 wdev->netdev = dev;
1206 #ifdef CONFIG_CFG80211_WEXT
1207 wdev->wext.default_key = -1;
1208 wdev->wext.default_mgmt_key = -1;
1209 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1210 #endif
1211
1212 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1213 wdev->ps = true;
1214 else
1215 wdev->ps = false;
1216 /* allow mac80211 to determine the timeout */
1217 wdev->ps_timeout = -1;
1218
1219 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1220 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1221 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1222 dev->priv_flags |= IFF_DONT_BRIDGE;
1223
1224 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1225
1226 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1227 break;
1228 case NETDEV_GOING_DOWN:
1229 cfg80211_leave(rdev, wdev);
1230 break;
1231 case NETDEV_DOWN:
1232 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1233 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1234 if (WARN_ON(!rdev->scan_req->notified))
1235 rdev->scan_req->info.aborted = true;
1236 ___cfg80211_scan_done(rdev, false);
1237 }
1238
1239 list_for_each_entry_safe(pos, tmp,
1240 &rdev->sched_scan_req_list, list) {
1241 if (WARN_ON(pos && pos->dev == wdev->netdev))
1242 cfg80211_stop_sched_scan_req(rdev, pos, false);
1243 }
1244
1245 rdev->opencount--;
1246 wake_up(&rdev->dev_wait);
1247 break;
1248 case NETDEV_UP:
1249 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1250 wdev_lock(wdev);
1251 switch (wdev->iftype) {
1252 #ifdef CONFIG_CFG80211_WEXT
1253 case NL80211_IFTYPE_ADHOC:
1254 cfg80211_ibss_wext_join(rdev, wdev);
1255 break;
1256 case NL80211_IFTYPE_STATION:
1257 cfg80211_mgd_wext_connect(rdev, wdev);
1258 break;
1259 #endif
1260 #ifdef CONFIG_MAC80211_MESH
1261 case NL80211_IFTYPE_MESH_POINT:
1262 {
1263 /* backward compat code... */
1264 struct mesh_setup setup;
1265 memcpy(&setup, &default_mesh_setup,
1266 sizeof(setup));
1267 /* back compat only needed for mesh_id */
1268 setup.mesh_id = wdev->ssid;
1269 setup.mesh_id_len = wdev->mesh_id_up_len;
1270 if (wdev->mesh_id_up_len)
1271 __cfg80211_join_mesh(rdev, dev,
1272 &setup,
1273 &default_mesh_config);
1274 break;
1275 }
1276 #endif
1277 default:
1278 break;
1279 }
1280 wdev_unlock(wdev);
1281 rdev->opencount++;
1282
1283 /*
1284 * Configure power management to the driver here so that its
1285 * correctly set also after interface type changes etc.
1286 */
1287 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1288 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1289 rdev->ops->set_power_mgmt &&
1290 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1291 wdev->ps_timeout)) {
1292 /* assume this means it's off */
1293 wdev->ps = false;
1294 }
1295 break;
1296 case NETDEV_UNREGISTER:
1297 /*
1298 * It is possible to get NETDEV_UNREGISTER
1299 * multiple times. To detect that, check
1300 * that the interface is still on the list
1301 * of registered interfaces, and only then
1302 * remove and clean it up.
1303 */
1304 if (!list_empty(&wdev->list)) {
1305 nl80211_notify_iface(rdev, wdev,
1306 NL80211_CMD_DEL_INTERFACE);
1307 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1308 list_del_rcu(&wdev->list);
1309 rdev->devlist_generation++;
1310 cfg80211_mlme_purge_registrations(wdev);
1311 #ifdef CONFIG_CFG80211_WEXT
1312 kzfree(wdev->wext.keys);
1313 #endif
1314 flush_work(&wdev->disconnect_wk);
1315 cfg80211_cqm_config_free(wdev);
1316 }
1317 /*
1318 * synchronise (so that we won't find this netdev
1319 * from other code any more) and then clear the list
1320 * head so that the above code can safely check for
1321 * !list_empty() to avoid double-cleanup.
1322 */
1323 synchronize_rcu();
1324 INIT_LIST_HEAD(&wdev->list);
1325 /*
1326 * Ensure that all events have been processed and
1327 * freed.
1328 */
1329 cfg80211_process_wdev_events(wdev);
1330
1331 if (WARN_ON(wdev->current_bss)) {
1332 cfg80211_unhold_bss(wdev->current_bss);
1333 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1334 wdev->current_bss = NULL;
1335 }
1336 break;
1337 case NETDEV_PRE_UP:
1338 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1339 return notifier_from_errno(-EOPNOTSUPP);
1340 if (rfkill_blocked(rdev->rfkill))
1341 return notifier_from_errno(-ERFKILL);
1342 break;
1343 default:
1344 return NOTIFY_DONE;
1345 }
1346
1347 wireless_nlevent_flush();
1348
1349 return NOTIFY_OK;
1350 }
1351
1352 static struct notifier_block cfg80211_netdev_notifier = {
1353 .notifier_call = cfg80211_netdev_notifier_call,
1354 };
1355
cfg80211_pernet_exit(struct net * net)1356 static void __net_exit cfg80211_pernet_exit(struct net *net)
1357 {
1358 struct cfg80211_registered_device *rdev;
1359
1360 rtnl_lock();
1361 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1362 if (net_eq(wiphy_net(&rdev->wiphy), net))
1363 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1364 }
1365 rtnl_unlock();
1366 }
1367
1368 static struct pernet_operations cfg80211_pernet_ops = {
1369 .exit = cfg80211_pernet_exit,
1370 };
1371
cfg80211_init(void)1372 static int __init cfg80211_init(void)
1373 {
1374 int err;
1375
1376 err = register_pernet_device(&cfg80211_pernet_ops);
1377 if (err)
1378 goto out_fail_pernet;
1379
1380 err = wiphy_sysfs_init();
1381 if (err)
1382 goto out_fail_sysfs;
1383
1384 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1385 if (err)
1386 goto out_fail_notifier;
1387
1388 err = nl80211_init();
1389 if (err)
1390 goto out_fail_nl80211;
1391
1392 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1393
1394 err = regulatory_init();
1395 if (err)
1396 goto out_fail_reg;
1397
1398 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1399 if (!cfg80211_wq) {
1400 err = -ENOMEM;
1401 goto out_fail_wq;
1402 }
1403
1404 return 0;
1405
1406 out_fail_wq:
1407 regulatory_exit();
1408 out_fail_reg:
1409 debugfs_remove(ieee80211_debugfs_dir);
1410 nl80211_exit();
1411 out_fail_nl80211:
1412 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1413 out_fail_notifier:
1414 wiphy_sysfs_exit();
1415 out_fail_sysfs:
1416 unregister_pernet_device(&cfg80211_pernet_ops);
1417 out_fail_pernet:
1418 return err;
1419 }
1420 fs_initcall(cfg80211_init);
1421
cfg80211_exit(void)1422 static void __exit cfg80211_exit(void)
1423 {
1424 debugfs_remove(ieee80211_debugfs_dir);
1425 nl80211_exit();
1426 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1427 wiphy_sysfs_exit();
1428 regulatory_exit();
1429 unregister_pernet_device(&cfg80211_pernet_ops);
1430 destroy_workqueue(cfg80211_wq);
1431 }
1432 module_exit(cfg80211_exit);
1433
