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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
35MODULE_AUTHOR("Johannes Berg");
36MODULE_LICENSE("GPL");
37MODULE_DESCRIPTION("wireless configuration support");
38MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
39
40/* RCU-protected (and RTNL for writers) */
41LIST_HEAD(cfg80211_rdev_list);
42int cfg80211_rdev_list_generation;
43
44/* for debugfs */
45static struct dentry *ieee80211_debugfs_dir;
46
47/* for the cleanup, scan and event works */
48struct workqueue_struct *cfg80211_wq;
49
50static bool cfg80211_disable_40mhz_24ghz;
51module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
52MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
53 "Disable 40MHz support in the 2.4GHz band");
54
55struct 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
71int 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
78struct 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
90static 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
121int 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
152int 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
198static 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
205void 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
228void 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
245void 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}
270EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
271
272static 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
286static 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
294static 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
306void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
307{
308 struct cfg80211_iface_destroy *item;
309
310 ASSERT_RTNL();
311
312 spin_lock_irq(&rdev->destroy_list_lock);
313 while ((item = list_first_entry_or_null(&rdev->destroy_list,
314 struct cfg80211_iface_destroy,
315 list))) {
316 struct wireless_dev *wdev, *tmp;
317 u32 nlportid = item->nlportid;
318
319 list_del(&item->list);
320 kfree(item);
321 spin_unlock_irq(&rdev->destroy_list_lock);
322
323 list_for_each_entry_safe(wdev, tmp,
324 &rdev->wiphy.wdev_list, list) {
325 if (nlportid == wdev->owner_nlportid)
326 rdev_del_virtual_intf(rdev, wdev);
327 }
328
329 spin_lock_irq(&rdev->destroy_list_lock);
330 }
331 spin_unlock_irq(&rdev->destroy_list_lock);
332}
333
334static void cfg80211_destroy_iface_wk(struct work_struct *work)
335{
336 struct cfg80211_registered_device *rdev;
337
338 rdev = container_of(work, struct cfg80211_registered_device,
339 destroy_work);
340
341 rtnl_lock();
342 cfg80211_destroy_ifaces(rdev);
343 rtnl_unlock();
344}
345
346static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
347{
348 struct cfg80211_registered_device *rdev;
349
350 rdev = container_of(work, struct cfg80211_registered_device,
351 sched_scan_stop_wk);
352
353 rtnl_lock();
354
355 __cfg80211_stop_sched_scan(rdev, false);
356
357 rtnl_unlock();
358}
359
360/* exported functions */
361
362struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
363 const char *requested_name)
364{
365 static atomic_t wiphy_counter = ATOMIC_INIT(0);
366
367 struct cfg80211_registered_device *rdev;
368 int alloc_size;
369
370 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
371 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
372 WARN_ON(ops->connect && !ops->disconnect);
373 WARN_ON(ops->join_ibss && !ops->leave_ibss);
374 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
375 WARN_ON(ops->add_station && !ops->del_station);
376 WARN_ON(ops->add_mpath && !ops->del_mpath);
377 WARN_ON(ops->join_mesh && !ops->leave_mesh);
378 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
379 WARN_ON(ops->start_ap && !ops->stop_ap);
380 WARN_ON(ops->join_ocb && !ops->leave_ocb);
381 WARN_ON(ops->suspend && !ops->resume);
382 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
383 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
384 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
385 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
386
387 alloc_size = sizeof(*rdev) + sizeof_priv;
388
389 rdev = kzalloc(alloc_size, GFP_KERNEL);
390 if (!rdev)
391 return NULL;
392
393 rdev->ops = ops;
394
395 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
396
397 if (unlikely(rdev->wiphy_idx < 0)) {
398 /* ugh, wrapped! */
399 atomic_dec(&wiphy_counter);
400 kfree(rdev);
401 return NULL;
402 }
403
404 /* atomic_inc_return makes it start at 1, make it start at 0 */
405 rdev->wiphy_idx--;
406
407 /* give it a proper name */
408 if (requested_name && requested_name[0]) {
409 int rv;
410
411 rtnl_lock();
412 rv = cfg80211_dev_check_name(rdev, requested_name);
413
414 if (rv < 0) {
415 rtnl_unlock();
416 goto use_default_name;
417 }
418
419 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
420 rtnl_unlock();
421 if (rv)
422 goto use_default_name;
423 } else {
424use_default_name:
425 /* NOTE: This is *probably* safe w/out holding rtnl because of
426 * the restrictions on phy names. Probably this call could
427 * fail if some other part of the kernel (re)named a device
428 * phyX. But, might should add some locking and check return
429 * value, and use a different name if this one exists?
430 */
431 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
432 }
433
434 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
435 INIT_LIST_HEAD(&rdev->beacon_registrations);
436 spin_lock_init(&rdev->beacon_registrations_lock);
437 spin_lock_init(&rdev->bss_lock);
438 INIT_LIST_HEAD(&rdev->bss_list);
439 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
440 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
441 INIT_LIST_HEAD(&rdev->mlme_unreg);
442 spin_lock_init(&rdev->mlme_unreg_lock);
443 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
444 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
445 cfg80211_dfs_channels_update_work);
446#ifdef CONFIG_CFG80211_WEXT
447 rdev->wiphy.wext = &cfg80211_wext_handler;
448#endif
449
450 device_initialize(&rdev->wiphy.dev);
451 rdev->wiphy.dev.class = &ieee80211_class;
452 rdev->wiphy.dev.platform_data = rdev;
453 device_enable_async_suspend(&rdev->wiphy.dev);
454
455 INIT_LIST_HEAD(&rdev->destroy_list);
456 spin_lock_init(&rdev->destroy_list_lock);
457 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
458 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
459
460#ifdef CONFIG_CFG80211_DEFAULT_PS
461 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
462#endif
463
464 wiphy_net_set(&rdev->wiphy, &init_net);
465
466 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
467 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
468 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
469 &rdev->rfkill_ops, rdev);
470
471 if (!rdev->rfkill) {
472 kfree(rdev);
473 return NULL;
474 }
475
476 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
477 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
478 INIT_WORK(&rdev->event_work, cfg80211_event_work);
479
480 init_waitqueue_head(&rdev->dev_wait);
481
482 /*
483 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
484 * Fragmentation and RTS threshold are disabled by default with the
485 * special -1 value.
486 */
487 rdev->wiphy.retry_short = 7;
488 rdev->wiphy.retry_long = 4;
489 rdev->wiphy.frag_threshold = (u32) -1;
490 rdev->wiphy.rts_threshold = (u32) -1;
491 rdev->wiphy.coverage_class = 0;
492
493 rdev->wiphy.max_num_csa_counters = 1;
494
495 rdev->wiphy.max_sched_scan_plans = 1;
496 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
497
498 return &rdev->wiphy;
499}
500EXPORT_SYMBOL(wiphy_new_nm);
501
502static int wiphy_verify_combinations(struct wiphy *wiphy)
503{
504 const struct ieee80211_iface_combination *c;
505 int i, j;
506
507 for (i = 0; i < wiphy->n_iface_combinations; i++) {
508 u32 cnt = 0;
509 u16 all_iftypes = 0;
510
511 c = &wiphy->iface_combinations[i];
512
513 /*
514 * Combinations with just one interface aren't real,
515 * however we make an exception for DFS.
516 */
517 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
518 return -EINVAL;
519
520 /* Need at least one channel */
521 if (WARN_ON(!c->num_different_channels))
522 return -EINVAL;
523
524 /*
525 * Put a sane limit on maximum number of different
526 * channels to simplify channel accounting code.
527 */
528 if (WARN_ON(c->num_different_channels >
529 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
530 return -EINVAL;
531
532 /* DFS only works on one channel. */
533 if (WARN_ON(c->radar_detect_widths &&
534 (c->num_different_channels > 1)))
535 return -EINVAL;
536
537 if (WARN_ON(!c->n_limits))
538 return -EINVAL;
539
540 for (j = 0; j < c->n_limits; j++) {
541 u16 types = c->limits[j].types;
542
543 /* interface types shouldn't overlap */
544 if (WARN_ON(types & all_iftypes))
545 return -EINVAL;
546 all_iftypes |= types;
547
548 if (WARN_ON(!c->limits[j].max))
549 return -EINVAL;
550
551 /* Shouldn't list software iftypes in combinations! */
552 if (WARN_ON(wiphy->software_iftypes & types))
553 return -EINVAL;
554
555 /* Only a single P2P_DEVICE can be allowed */
556 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
557 c->limits[j].max > 1))
558 return -EINVAL;
559
560 /* Only a single NAN can be allowed */
561 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
562 c->limits[j].max > 1))
563 return -EINVAL;
564
565 /*
566 * This isn't well-defined right now. If you have an
567 * IBSS interface, then its beacon interval may change
568 * by joining other networks, and nothing prevents it
569 * from doing that.
570 * So technically we probably shouldn't even allow AP
571 * and IBSS in the same interface, but it seems that
572 * some drivers support that, possibly only with fixed
573 * beacon intervals for IBSS.
574 */
575 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
576 c->beacon_int_min_gcd)) {
577 return -EINVAL;
578 }
579
580 cnt += c->limits[j].max;
581 /*
582 * Don't advertise an unsupported type
583 * in a combination.
584 */
585 if (WARN_ON((wiphy->interface_modes & types) != types))
586 return -EINVAL;
587 }
588
589#ifndef CONFIG_WIRELESS_WDS
590 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
591 return -EINVAL;
592#endif
593
594 /* You can't even choose that many! */
595 if (WARN_ON(cnt < c->max_interfaces))
596 return -EINVAL;
597 }
598
599 return 0;
600}
601
602int wiphy_register(struct wiphy *wiphy)
603{
604 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
605 int res;
606 enum nl80211_band band;
607 struct ieee80211_supported_band *sband;
608 bool have_band = false;
609 int i;
610 u16 ifmodes = wiphy->interface_modes;
611
612#ifdef CONFIG_PM
613 if (WARN_ON(wiphy->wowlan &&
614 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
615 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
616 return -EINVAL;
617 if (WARN_ON(wiphy->wowlan &&
618 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
619 !wiphy->wowlan->tcp))
620 return -EINVAL;
621#endif
622 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
623 (!rdev->ops->tdls_channel_switch ||
624 !rdev->ops->tdls_cancel_channel_switch)))
625 return -EINVAL;
626
627 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
628 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
629 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func)))
630 return -EINVAL;
631
632#ifndef CONFIG_WIRELESS_WDS
633 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
634 return -EINVAL;
635#endif
636
637 /*
638 * if a wiphy has unsupported modes for regulatory channel enforcement,
639 * opt-out of enforcement checking
640 */
641 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
642 BIT(NL80211_IFTYPE_P2P_CLIENT) |
643 BIT(NL80211_IFTYPE_AP) |
644 BIT(NL80211_IFTYPE_P2P_GO) |
645 BIT(NL80211_IFTYPE_ADHOC) |
646 BIT(NL80211_IFTYPE_P2P_DEVICE) |
647 BIT(NL80211_IFTYPE_NAN) |
648 BIT(NL80211_IFTYPE_AP_VLAN) |
649 BIT(NL80211_IFTYPE_MONITOR)))
650 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
651
652 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
653 (wiphy->regulatory_flags &
654 (REGULATORY_CUSTOM_REG |
655 REGULATORY_STRICT_REG |
656 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
657 REGULATORY_COUNTRY_IE_IGNORE))))
658 return -EINVAL;
659
660 if (WARN_ON(wiphy->coalesce &&
661 (!wiphy->coalesce->n_rules ||
662 !wiphy->coalesce->n_patterns) &&
663 (!wiphy->coalesce->pattern_min_len ||
664 wiphy->coalesce->pattern_min_len >
665 wiphy->coalesce->pattern_max_len)))
666 return -EINVAL;
667
668 if (WARN_ON(wiphy->ap_sme_capa &&
669 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
670 return -EINVAL;
671
672 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
673 return -EINVAL;
674
675 if (WARN_ON(wiphy->addresses &&
676 !is_zero_ether_addr(wiphy->perm_addr) &&
677 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
678 ETH_ALEN)))
679 return -EINVAL;
680
681 if (WARN_ON(wiphy->max_acl_mac_addrs &&
682 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
683 !rdev->ops->set_mac_acl)))
684 return -EINVAL;
685
686 /* assure only valid behaviours are flagged by driver
687 * hence subtract 2 as bit 0 is invalid.
688 */
689 if (WARN_ON(wiphy->bss_select_support &&
690 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
691 return -EINVAL;
692
693 if (wiphy->addresses)
694 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
695
696 /* sanity check ifmodes */
697 WARN_ON(!ifmodes);
698 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
699 if (WARN_ON(ifmodes != wiphy->interface_modes))
700 wiphy->interface_modes = ifmodes;
701
702 res = wiphy_verify_combinations(wiphy);
703 if (res)
704 return res;
705
706 /* sanity check supported bands/channels */
707 for (band = 0; band < NUM_NL80211_BANDS; band++) {
708 sband = wiphy->bands[band];
709 if (!sband)
710 continue;
711
712 sband->band = band;
713 if (WARN_ON(!sband->n_channels))
714 return -EINVAL;
715 /*
716 * on 60GHz band, there are no legacy rates, so
717 * n_bitrates is 0
718 */
719 if (WARN_ON(band != NL80211_BAND_60GHZ &&
720 !sband->n_bitrates))
721 return -EINVAL;
722
723 /*
724 * Since cfg80211_disable_40mhz_24ghz is global, we can
725 * modify the sband's ht data even if the driver uses a
726 * global structure for that.
727 */
728 if (cfg80211_disable_40mhz_24ghz &&
729 band == NL80211_BAND_2GHZ &&
730 sband->ht_cap.ht_supported) {
731 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
732 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
733 }
734
735 /*
736 * Since we use a u32 for rate bitmaps in
737 * ieee80211_get_response_rate, we cannot
738 * have more than 32 legacy rates.
739 */
740 if (WARN_ON(sband->n_bitrates > 32))
741 return -EINVAL;
742
743 for (i = 0; i < sband->n_channels; i++) {
744 sband->channels[i].orig_flags =
745 sband->channels[i].flags;
746 sband->channels[i].orig_mag = INT_MAX;
747 sband->channels[i].orig_mpwr =
748 sband->channels[i].max_power;
749 sband->channels[i].band = band;
750 }
751
752 have_band = true;
753 }
754
755 if (!have_band) {
756 WARN_ON(1);
757 return -EINVAL;
758 }
759
760#ifdef CONFIG_PM
761 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
762 (!rdev->wiphy.wowlan->pattern_min_len ||
763 rdev->wiphy.wowlan->pattern_min_len >
764 rdev->wiphy.wowlan->pattern_max_len)))
765 return -EINVAL;
766#endif
767
768 /* check and set up bitrates */
769 ieee80211_set_bitrate_flags(wiphy);
770
771 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
772
773 rtnl_lock();
774 res = device_add(&rdev->wiphy.dev);
775 if (res) {
776 rtnl_unlock();
777 return res;
778 }
779
780 /* set up regulatory info */
781 wiphy_regulatory_register(wiphy);
782
783 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
784 cfg80211_rdev_list_generation++;
785
786 /* add to debugfs */
787 rdev->wiphy.debugfsdir =
788 debugfs_create_dir(wiphy_name(&rdev->wiphy),
789 ieee80211_debugfs_dir);
790 if (IS_ERR(rdev->wiphy.debugfsdir))
791 rdev->wiphy.debugfsdir = NULL;
792
793 cfg80211_debugfs_rdev_add(rdev);
794 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
795
796 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
797 struct regulatory_request request;
798
799 request.wiphy_idx = get_wiphy_idx(wiphy);
800 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
801 request.alpha2[0] = '9';
802 request.alpha2[1] = '9';
803
804 nl80211_send_reg_change_event(&request);
805 }
806
807 /* Check that nobody globally advertises any capabilities they do not
808 * advertise on all possible interface types.
809 */
810 if (wiphy->extended_capabilities_len &&
811 wiphy->num_iftype_ext_capab &&
812 wiphy->iftype_ext_capab) {
813 u8 supported_on_all, j;
814 const struct wiphy_iftype_ext_capab *capab;
815
816 capab = wiphy->iftype_ext_capab;
817 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
818 if (capab[0].extended_capabilities_len > j)
819 supported_on_all =
820 capab[0].extended_capabilities[j];
821 else
822 supported_on_all = 0x00;
823 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
824 if (j >= capab[i].extended_capabilities_len) {
825 supported_on_all = 0x00;
826 break;
827 }
828 supported_on_all &=
829 capab[i].extended_capabilities[j];
830 }
831 if (WARN_ON(wiphy->extended_capabilities[j] &
832 ~supported_on_all))
833 break;
834 }
835 }
836
837 rdev->wiphy.registered = true;
838 rtnl_unlock();
839
840 res = rfkill_register(rdev->rfkill);
841 if (res) {
842 rfkill_destroy(rdev->rfkill);
843 rdev->rfkill = NULL;
844 wiphy_unregister(&rdev->wiphy);
845 return res;
846 }
847
848 return 0;
849}
850EXPORT_SYMBOL(wiphy_register);
851
852void wiphy_rfkill_start_polling(struct wiphy *wiphy)
853{
854 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
855
856 if (!rdev->ops->rfkill_poll)
857 return;
858 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
859 rfkill_resume_polling(rdev->rfkill);
860}
861EXPORT_SYMBOL(wiphy_rfkill_start_polling);
862
863void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
864{
865 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
866
867 rfkill_pause_polling(rdev->rfkill);
868}
869EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
870
871void wiphy_unregister(struct wiphy *wiphy)
872{
873 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
874
875 wait_event(rdev->dev_wait, ({
876 int __count;
877 rtnl_lock();
878 __count = rdev->opencount;
879 rtnl_unlock();
880 __count == 0; }));
881
882 if (rdev->rfkill)
883 rfkill_unregister(rdev->rfkill);
884
885 rtnl_lock();
886 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
887 rdev->wiphy.registered = false;
888
889 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
890
891 /*
892 * First remove the hardware from everywhere, this makes
893 * it impossible to find from userspace.
894 */
895 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
896 list_del_rcu(&rdev->list);
897 synchronize_rcu();
898
899 /*
900 * If this device got a regulatory hint tell core its
901 * free to listen now to a new shiny device regulatory hint
902 */
903 wiphy_regulatory_deregister(wiphy);
904
905 cfg80211_rdev_list_generation++;
906 device_del(&rdev->wiphy.dev);
907
908 rtnl_unlock();
909
910 flush_work(&rdev->scan_done_wk);
911 cancel_work_sync(&rdev->conn_work);
912 flush_work(&rdev->event_work);
913 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
914 flush_work(&rdev->destroy_work);
915 flush_work(&rdev->sched_scan_stop_wk);
916 flush_work(&rdev->mlme_unreg_wk);
917
918#ifdef CONFIG_PM
919 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
920 rdev_set_wakeup(rdev, false);
921#endif
922 cfg80211_rdev_free_wowlan(rdev);
923 cfg80211_rdev_free_coalesce(rdev);
924}
925EXPORT_SYMBOL(wiphy_unregister);
926
927void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
928{
929 struct cfg80211_internal_bss *scan, *tmp;
930 struct cfg80211_beacon_registration *reg, *treg;
931 rfkill_destroy(rdev->rfkill);
932 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
933 list_del(®->list);
934 kfree(reg);
935 }
936 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
937 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
938 kfree(rdev);
939}
940
941void wiphy_free(struct wiphy *wiphy)
942{
943 put_device(&wiphy->dev);
944}
945EXPORT_SYMBOL(wiphy_free);
946
947void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
948{
949 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
950
951 if (rfkill_set_hw_state(rdev->rfkill, blocked))
952 schedule_work(&rdev->rfkill_sync);
953}
954EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
955
956void cfg80211_unregister_wdev(struct wireless_dev *wdev)
957{
958 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
959
960 ASSERT_RTNL();
961
962 if (WARN_ON(wdev->netdev))
963 return;
964
965 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
966
967 list_del_rcu(&wdev->list);
968 rdev->devlist_generation++;
969
970 switch (wdev->iftype) {
971 case NL80211_IFTYPE_P2P_DEVICE:
972 cfg80211_mlme_purge_registrations(wdev);
973 cfg80211_stop_p2p_device(rdev, wdev);
974 break;
975 case NL80211_IFTYPE_NAN:
976 cfg80211_stop_nan(rdev, wdev);
977 break;
978 default:
979 WARN_ON_ONCE(1);
980 break;
981 }
982}
983EXPORT_SYMBOL(cfg80211_unregister_wdev);
984
985static const struct device_type wiphy_type = {
986 .name = "wlan",
987};
988
989void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
990 enum nl80211_iftype iftype, int num)
991{
992 ASSERT_RTNL();
993
994 rdev->num_running_ifaces += num;
995 if (iftype == NL80211_IFTYPE_MONITOR)
996 rdev->num_running_monitor_ifaces += num;
997}
998
999void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1000 struct wireless_dev *wdev)
1001{
1002 struct net_device *dev = wdev->netdev;
1003 struct cfg80211_sched_scan_request *sched_scan_req;
1004
1005 ASSERT_RTNL();
1006 ASSERT_WDEV_LOCK(wdev);
1007
1008 switch (wdev->iftype) {
1009 case NL80211_IFTYPE_ADHOC:
1010 __cfg80211_leave_ibss(rdev, dev, true);
1011 break;
1012 case NL80211_IFTYPE_P2P_CLIENT:
1013 case NL80211_IFTYPE_STATION:
1014 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1015 if (sched_scan_req && dev == sched_scan_req->dev)
1016 __cfg80211_stop_sched_scan(rdev, false);
1017
1018#ifdef CONFIG_CFG80211_WEXT
1019 kfree(wdev->wext.ie);
1020 wdev->wext.ie = NULL;
1021 wdev->wext.ie_len = 0;
1022 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1023#endif
1024 cfg80211_disconnect(rdev, dev,
1025 WLAN_REASON_DEAUTH_LEAVING, true);
1026 break;
1027 case NL80211_IFTYPE_MESH_POINT:
1028 __cfg80211_leave_mesh(rdev, dev);
1029 break;
1030 case NL80211_IFTYPE_AP:
1031 case NL80211_IFTYPE_P2P_GO:
1032 __cfg80211_stop_ap(rdev, dev, true);
1033 break;
1034 case NL80211_IFTYPE_OCB:
1035 __cfg80211_leave_ocb(rdev, dev);
1036 break;
1037 case NL80211_IFTYPE_WDS:
1038 /* must be handled by mac80211/driver, has no APIs */
1039 break;
1040 case NL80211_IFTYPE_P2P_DEVICE:
1041 case NL80211_IFTYPE_NAN:
1042 /* cannot happen, has no netdev */
1043 break;
1044 case NL80211_IFTYPE_AP_VLAN:
1045 case NL80211_IFTYPE_MONITOR:
1046 /* nothing to do */
1047 break;
1048 case NL80211_IFTYPE_UNSPECIFIED:
1049 case NUM_NL80211_IFTYPES:
1050 /* invalid */
1051 break;
1052 }
1053}
1054
1055void cfg80211_leave(struct cfg80211_registered_device *rdev,
1056 struct wireless_dev *wdev)
1057{
1058 wdev_lock(wdev);
1059 __cfg80211_leave(rdev, wdev);
1060 wdev_unlock(wdev);
1061}
1062
1063void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1064 gfp_t gfp)
1065{
1066 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1067 struct cfg80211_event *ev;
1068 unsigned long flags;
1069
1070 trace_cfg80211_stop_iface(wiphy, wdev);
1071
1072 ev = kzalloc(sizeof(*ev), gfp);
1073 if (!ev)
1074 return;
1075
1076 ev->type = EVENT_STOPPED;
1077
1078 spin_lock_irqsave(&wdev->event_lock, flags);
1079 list_add_tail(&ev->list, &wdev->event_list);
1080 spin_unlock_irqrestore(&wdev->event_lock, flags);
1081 queue_work(cfg80211_wq, &rdev->event_work);
1082}
1083EXPORT_SYMBOL(cfg80211_stop_iface);
1084
1085static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1086 unsigned long state, void *ptr)
1087{
1088 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1089 struct wireless_dev *wdev = dev->ieee80211_ptr;
1090 struct cfg80211_registered_device *rdev;
1091 struct cfg80211_sched_scan_request *sched_scan_req;
1092
1093 if (!wdev)
1094 return NOTIFY_DONE;
1095
1096 rdev = wiphy_to_rdev(wdev->wiphy);
1097
1098 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1099
1100 switch (state) {
1101 case NETDEV_POST_INIT:
1102 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1103 break;
1104 case NETDEV_REGISTER:
1105 /*
1106 * NB: cannot take rdev->mtx here because this may be
1107 * called within code protected by it when interfaces
1108 * are added with nl80211.
1109 */
1110 mutex_init(&wdev->mtx);
1111 INIT_LIST_HEAD(&wdev->event_list);
1112 spin_lock_init(&wdev->event_lock);
1113 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1114 spin_lock_init(&wdev->mgmt_registrations_lock);
1115
1116 wdev->identifier = ++rdev->wdev_id;
1117 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1118 rdev->devlist_generation++;
1119 /* can only change netns with wiphy */
1120 dev->features |= NETIF_F_NETNS_LOCAL;
1121
1122 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1123 "phy80211")) {
1124 pr_err("failed to add phy80211 symlink to netdev!\n");
1125 }
1126 wdev->netdev = dev;
1127#ifdef CONFIG_CFG80211_WEXT
1128 wdev->wext.default_key = -1;
1129 wdev->wext.default_mgmt_key = -1;
1130 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1131#endif
1132
1133 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1134 wdev->ps = true;
1135 else
1136 wdev->ps = false;
1137 /* allow mac80211 to determine the timeout */
1138 wdev->ps_timeout = -1;
1139
1140 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1141 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1142 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1143 dev->priv_flags |= IFF_DONT_BRIDGE;
1144
1145 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1146 break;
1147 case NETDEV_GOING_DOWN:
1148 cfg80211_leave(rdev, wdev);
1149 break;
1150 case NETDEV_DOWN:
1151 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1152 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1153 if (WARN_ON(!rdev->scan_req->notified))
1154 rdev->scan_req->info.aborted = true;
1155 ___cfg80211_scan_done(rdev, false);
1156 }
1157
1158 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1159 if (WARN_ON(sched_scan_req &&
1160 sched_scan_req->dev == wdev->netdev)) {
1161 __cfg80211_stop_sched_scan(rdev, false);
1162 }
1163
1164 rdev->opencount--;
1165 wake_up(&rdev->dev_wait);
1166 break;
1167 case NETDEV_UP:
1168 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1169 wdev_lock(wdev);
1170 switch (wdev->iftype) {
1171#ifdef CONFIG_CFG80211_WEXT
1172 case NL80211_IFTYPE_ADHOC:
1173 cfg80211_ibss_wext_join(rdev, wdev);
1174 break;
1175 case NL80211_IFTYPE_STATION:
1176 cfg80211_mgd_wext_connect(rdev, wdev);
1177 break;
1178#endif
1179#ifdef CONFIG_MAC80211_MESH
1180 case NL80211_IFTYPE_MESH_POINT:
1181 {
1182 /* backward compat code... */
1183 struct mesh_setup setup;
1184 memcpy(&setup, &default_mesh_setup,
1185 sizeof(setup));
1186 /* back compat only needed for mesh_id */
1187 setup.mesh_id = wdev->ssid;
1188 setup.mesh_id_len = wdev->mesh_id_up_len;
1189 if (wdev->mesh_id_up_len)
1190 __cfg80211_join_mesh(rdev, dev,
1191 &setup,
1192 &default_mesh_config);
1193 break;
1194 }
1195#endif
1196 default:
1197 break;
1198 }
1199 wdev_unlock(wdev);
1200 rdev->opencount++;
1201
1202 /*
1203 * Configure power management to the driver here so that its
1204 * correctly set also after interface type changes etc.
1205 */
1206 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1207 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1208 rdev->ops->set_power_mgmt)
1209 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1210 wdev->ps_timeout)) {
1211 /* assume this means it's off */
1212 wdev->ps = false;
1213 }
1214 break;
1215 case NETDEV_UNREGISTER:
1216 /*
1217 * It is possible to get NETDEV_UNREGISTER
1218 * multiple times. To detect that, check
1219 * that the interface is still on the list
1220 * of registered interfaces, and only then
1221 * remove and clean it up.
1222 */
1223 if (!list_empty(&wdev->list)) {
1224 nl80211_notify_iface(rdev, wdev,
1225 NL80211_CMD_DEL_INTERFACE);
1226 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1227 list_del_rcu(&wdev->list);
1228 rdev->devlist_generation++;
1229 cfg80211_mlme_purge_registrations(wdev);
1230#ifdef CONFIG_CFG80211_WEXT
1231 kzfree(wdev->wext.keys);
1232#endif
1233 }
1234 /*
1235 * synchronise (so that we won't find this netdev
1236 * from other code any more) and then clear the list
1237 * head so that the above code can safely check for
1238 * !list_empty() to avoid double-cleanup.
1239 */
1240 synchronize_rcu();
1241 INIT_LIST_HEAD(&wdev->list);
1242 /*
1243 * Ensure that all events have been processed and
1244 * freed.
1245 */
1246 cfg80211_process_wdev_events(wdev);
1247
1248 if (WARN_ON(wdev->current_bss)) {
1249 cfg80211_unhold_bss(wdev->current_bss);
1250 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1251 wdev->current_bss = NULL;
1252 }
1253 break;
1254 case NETDEV_PRE_UP:
1255 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1256 return notifier_from_errno(-EOPNOTSUPP);
1257 if (rfkill_blocked(rdev->rfkill))
1258 return notifier_from_errno(-ERFKILL);
1259 break;
1260 default:
1261 return NOTIFY_DONE;
1262 }
1263
1264 wireless_nlevent_flush();
1265
1266 return NOTIFY_OK;
1267}
1268
1269static struct notifier_block cfg80211_netdev_notifier = {
1270 .notifier_call = cfg80211_netdev_notifier_call,
1271};
1272
1273static void __net_exit cfg80211_pernet_exit(struct net *net)
1274{
1275 struct cfg80211_registered_device *rdev;
1276
1277 rtnl_lock();
1278 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1279 if (net_eq(wiphy_net(&rdev->wiphy), net))
1280 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1281 }
1282 rtnl_unlock();
1283}
1284
1285static struct pernet_operations cfg80211_pernet_ops = {
1286 .exit = cfg80211_pernet_exit,
1287};
1288
1289static int __init cfg80211_init(void)
1290{
1291 int err;
1292
1293 err = register_pernet_device(&cfg80211_pernet_ops);
1294 if (err)
1295 goto out_fail_pernet;
1296
1297 err = wiphy_sysfs_init();
1298 if (err)
1299 goto out_fail_sysfs;
1300
1301 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1302 if (err)
1303 goto out_fail_notifier;
1304
1305 err = nl80211_init();
1306 if (err)
1307 goto out_fail_nl80211;
1308
1309 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1310
1311 err = regulatory_init();
1312 if (err)
1313 goto out_fail_reg;
1314
1315 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1316 if (!cfg80211_wq) {
1317 err = -ENOMEM;
1318 goto out_fail_wq;
1319 }
1320
1321 return 0;
1322
1323out_fail_wq:
1324 regulatory_exit();
1325out_fail_reg:
1326 debugfs_remove(ieee80211_debugfs_dir);
1327 nl80211_exit();
1328out_fail_nl80211:
1329 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1330out_fail_notifier:
1331 wiphy_sysfs_exit();
1332out_fail_sysfs:
1333 unregister_pernet_device(&cfg80211_pernet_ops);
1334out_fail_pernet:
1335 return err;
1336}
1337subsys_initcall(cfg80211_init);
1338
1339static void __exit cfg80211_exit(void)
1340{
1341 debugfs_remove(ieee80211_debugfs_dir);
1342 nl80211_exit();
1343 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1344 wiphy_sysfs_exit();
1345 regulatory_exit();
1346 unregister_pernet_device(&cfg80211_pernet_ops);
1347 destroy_workqueue(cfg80211_wq);
1348}
1349module_exit(cfg80211_exit);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This is the linux wireless configuration interface.
4 *
5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2015-2017 Intel Deutschland GmbH
8 * Copyright (C) 2018-2022 Intel Corporation
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/if.h>
14#include <linux/module.h>
15#include <linux/err.h>
16#include <linux/list.h>
17#include <linux/slab.h>
18#include <linux/nl80211.h>
19#include <linux/debugfs.h>
20#include <linux/notifier.h>
21#include <linux/device.h>
22#include <linux/etherdevice.h>
23#include <linux/rtnetlink.h>
24#include <linux/sched.h>
25#include <net/genetlink.h>
26#include <net/cfg80211.h>
27#include "nl80211.h"
28#include "core.h"
29#include "sysfs.h"
30#include "debugfs.h"
31#include "wext-compat.h"
32#include "rdev-ops.h"
33
34/* name for sysfs, %d is appended */
35#define PHY_NAME "phy"
36
37MODULE_AUTHOR("Johannes Berg");
38MODULE_LICENSE("GPL");
39MODULE_DESCRIPTION("wireless configuration support");
40MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
41
42/* RCU-protected (and RTNL for writers) */
43LIST_HEAD(cfg80211_rdev_list);
44int cfg80211_rdev_list_generation;
45
46/* for debugfs */
47static struct dentry *ieee80211_debugfs_dir;
48
49/* for the cleanup, scan and event works */
50struct workqueue_struct *cfg80211_wq;
51
52static bool cfg80211_disable_40mhz_24ghz;
53module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
54MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
55 "Disable 40MHz support in the 2.4GHz band");
56
57struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
58{
59 struct cfg80211_registered_device *result = NULL, *rdev;
60
61 ASSERT_RTNL();
62
63 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
64 if (rdev->wiphy_idx == wiphy_idx) {
65 result = rdev;
66 break;
67 }
68 }
69
70 return result;
71}
72
73int get_wiphy_idx(struct wiphy *wiphy)
74{
75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
76
77 return rdev->wiphy_idx;
78}
79
80struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
81{
82 struct cfg80211_registered_device *rdev;
83
84 ASSERT_RTNL();
85
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
87 if (!rdev)
88 return NULL;
89 return &rdev->wiphy;
90}
91
92static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
93 const char *newname)
94{
95 struct cfg80211_registered_device *rdev2;
96 int wiphy_idx, taken = -1, digits;
97
98 ASSERT_RTNL();
99
100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
101 return -EINVAL;
102
103 /* prohibit calling the thing phy%d when %d is not its number */
104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
106 /* count number of places needed to print wiphy_idx */
107 digits = 1;
108 while (wiphy_idx /= 10)
109 digits++;
110 /*
111 * deny the name if it is phy<idx> where <idx> is printed
112 * without leading zeroes. taken == strlen(newname) here
113 */
114 if (taken == strlen(PHY_NAME) + digits)
115 return -EINVAL;
116 }
117
118 /* Ensure another device does not already have this name. */
119 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
121 return -EINVAL;
122
123 return 0;
124}
125
126int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
127 char *newname)
128{
129 int result;
130
131 ASSERT_RTNL();
132
133 /* Ignore nop renames */
134 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
135 return 0;
136
137 result = cfg80211_dev_check_name(rdev, newname);
138 if (result < 0)
139 return result;
140
141 result = device_rename(&rdev->wiphy.dev, newname);
142 if (result)
143 return result;
144
145 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
146 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
147 rdev->wiphy.debugfsdir,
148 rdev->wiphy.debugfsdir->d_parent, newname);
149
150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
151
152 return 0;
153}
154
155int 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 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
194 if (!wdev->netdev)
195 continue;
196 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
197 }
198 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
199
200 wiphy_net_set(&rdev->wiphy, net);
201
202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
203 WARN_ON(err);
204
205 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
206 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
207 if (!wdev->netdev)
208 continue;
209 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
210 }
211
212 return 0;
213}
214
215static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
216{
217 struct cfg80211_registered_device *rdev = data;
218
219 rdev_rfkill_poll(rdev);
220}
221
222void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
223 struct wireless_dev *wdev)
224{
225 lockdep_assert_held(&rdev->wiphy.mtx);
226
227 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
228 return;
229
230 if (!wdev_running(wdev))
231 return;
232
233 rdev_stop_p2p_device(rdev, wdev);
234 wdev->is_running = false;
235
236 rdev->opencount--;
237
238 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
239 if (WARN_ON(!rdev->scan_req->notified &&
240 (!rdev->int_scan_req ||
241 !rdev->int_scan_req->notified)))
242 rdev->scan_req->info.aborted = true;
243 ___cfg80211_scan_done(rdev, false);
244 }
245}
246
247void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
248 struct wireless_dev *wdev)
249{
250 lockdep_assert_held(&rdev->wiphy.mtx);
251
252 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
253 return;
254
255 if (!wdev_running(wdev))
256 return;
257
258 rdev_stop_nan(rdev, wdev);
259 wdev->is_running = false;
260
261 rdev->opencount--;
262}
263
264void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
265{
266 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
267 struct wireless_dev *wdev;
268
269 ASSERT_RTNL();
270
271 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
272 if (wdev->netdev) {
273 dev_close(wdev->netdev);
274 continue;
275 }
276
277 /* otherwise, check iftype */
278
279 wiphy_lock(wiphy);
280
281 switch (wdev->iftype) {
282 case NL80211_IFTYPE_P2P_DEVICE:
283 cfg80211_stop_p2p_device(rdev, wdev);
284 break;
285 case NL80211_IFTYPE_NAN:
286 cfg80211_stop_nan(rdev, wdev);
287 break;
288 default:
289 break;
290 }
291
292 wiphy_unlock(wiphy);
293 }
294}
295EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
296
297static int cfg80211_rfkill_set_block(void *data, bool blocked)
298{
299 struct cfg80211_registered_device *rdev = data;
300
301 if (!blocked)
302 return 0;
303
304 rtnl_lock();
305 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
306 rtnl_unlock();
307
308 return 0;
309}
310
311static void cfg80211_rfkill_block_work(struct work_struct *work)
312{
313 struct cfg80211_registered_device *rdev;
314
315 rdev = container_of(work, struct cfg80211_registered_device,
316 rfkill_block);
317 cfg80211_rfkill_set_block(rdev, true);
318}
319
320static void cfg80211_event_work(struct work_struct *work)
321{
322 struct cfg80211_registered_device *rdev;
323
324 rdev = container_of(work, struct cfg80211_registered_device,
325 event_work);
326
327 wiphy_lock(&rdev->wiphy);
328 cfg80211_process_rdev_events(rdev);
329 wiphy_unlock(&rdev->wiphy);
330}
331
332void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
333{
334 struct wireless_dev *wdev, *tmp;
335
336 ASSERT_RTNL();
337
338 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
339 if (wdev->nl_owner_dead) {
340 if (wdev->netdev)
341 dev_close(wdev->netdev);
342
343 wiphy_lock(&rdev->wiphy);
344 cfg80211_leave(rdev, wdev);
345 cfg80211_remove_virtual_intf(rdev, wdev);
346 wiphy_unlock(&rdev->wiphy);
347 }
348 }
349}
350
351static void cfg80211_destroy_iface_wk(struct work_struct *work)
352{
353 struct cfg80211_registered_device *rdev;
354
355 rdev = container_of(work, struct cfg80211_registered_device,
356 destroy_work);
357
358 rtnl_lock();
359 cfg80211_destroy_ifaces(rdev);
360 rtnl_unlock();
361}
362
363static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
364{
365 struct cfg80211_registered_device *rdev;
366 struct cfg80211_sched_scan_request *req, *tmp;
367
368 rdev = container_of(work, struct cfg80211_registered_device,
369 sched_scan_stop_wk);
370
371 rtnl_lock();
372 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
373 if (req->nl_owner_dead)
374 cfg80211_stop_sched_scan_req(rdev, req, false);
375 }
376 rtnl_unlock();
377}
378
379static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
380{
381 struct cfg80211_registered_device *rdev;
382
383 rdev = container_of(work, struct cfg80211_registered_device,
384 propagate_radar_detect_wk);
385
386 rtnl_lock();
387
388 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
389 NL80211_DFS_UNAVAILABLE,
390 NL80211_RADAR_DETECTED);
391
392 rtnl_unlock();
393}
394
395static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
396{
397 struct cfg80211_registered_device *rdev;
398
399 rdev = container_of(work, struct cfg80211_registered_device,
400 propagate_cac_done_wk);
401
402 rtnl_lock();
403
404 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
405 NL80211_DFS_AVAILABLE,
406 NL80211_RADAR_CAC_FINISHED);
407
408 rtnl_unlock();
409}
410
411/* exported functions */
412
413struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
414 const char *requested_name)
415{
416 static atomic_t wiphy_counter = ATOMIC_INIT(0);
417
418 struct cfg80211_registered_device *rdev;
419 int alloc_size;
420
421 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
422 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
423 WARN_ON(ops->connect && !ops->disconnect);
424 WARN_ON(ops->join_ibss && !ops->leave_ibss);
425 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
426 WARN_ON(ops->add_station && !ops->del_station);
427 WARN_ON(ops->add_mpath && !ops->del_mpath);
428 WARN_ON(ops->join_mesh && !ops->leave_mesh);
429 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
430 WARN_ON(ops->start_ap && !ops->stop_ap);
431 WARN_ON(ops->join_ocb && !ops->leave_ocb);
432 WARN_ON(ops->suspend && !ops->resume);
433 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
434 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
435 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
436 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
437
438 alloc_size = sizeof(*rdev) + sizeof_priv;
439
440 rdev = kzalloc(alloc_size, GFP_KERNEL);
441 if (!rdev)
442 return NULL;
443
444 rdev->ops = ops;
445
446 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
447
448 if (unlikely(rdev->wiphy_idx < 0)) {
449 /* ugh, wrapped! */
450 atomic_dec(&wiphy_counter);
451 kfree(rdev);
452 return NULL;
453 }
454
455 /* atomic_inc_return makes it start at 1, make it start at 0 */
456 rdev->wiphy_idx--;
457
458 /* give it a proper name */
459 if (requested_name && requested_name[0]) {
460 int rv;
461
462 rtnl_lock();
463 rv = cfg80211_dev_check_name(rdev, requested_name);
464
465 if (rv < 0) {
466 rtnl_unlock();
467 goto use_default_name;
468 }
469
470 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
471 rtnl_unlock();
472 if (rv)
473 goto use_default_name;
474 } else {
475 int rv;
476
477use_default_name:
478 /* NOTE: This is *probably* safe w/out holding rtnl because of
479 * the restrictions on phy names. Probably this call could
480 * fail if some other part of the kernel (re)named a device
481 * phyX. But, might should add some locking and check return
482 * value, and use a different name if this one exists?
483 */
484 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
485 if (rv < 0) {
486 kfree(rdev);
487 return NULL;
488 }
489 }
490
491 mutex_init(&rdev->wiphy.mtx);
492 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
493 INIT_LIST_HEAD(&rdev->beacon_registrations);
494 spin_lock_init(&rdev->beacon_registrations_lock);
495 spin_lock_init(&rdev->bss_lock);
496 INIT_LIST_HEAD(&rdev->bss_list);
497 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
498 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
499 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
500 cfg80211_dfs_channels_update_work);
501#ifdef CONFIG_CFG80211_WEXT
502 rdev->wiphy.wext = &cfg80211_wext_handler;
503#endif
504
505 device_initialize(&rdev->wiphy.dev);
506 rdev->wiphy.dev.class = &ieee80211_class;
507 rdev->wiphy.dev.platform_data = rdev;
508 device_enable_async_suspend(&rdev->wiphy.dev);
509
510 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
511 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
512 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
513 INIT_WORK(&rdev->propagate_radar_detect_wk,
514 cfg80211_propagate_radar_detect_wk);
515 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
516 INIT_WORK(&rdev->mgmt_registrations_update_wk,
517 cfg80211_mgmt_registrations_update_wk);
518 spin_lock_init(&rdev->mgmt_registrations_lock);
519
520#ifdef CONFIG_CFG80211_DEFAULT_PS
521 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
522#endif
523
524 wiphy_net_set(&rdev->wiphy, &init_net);
525
526 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
527 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
528 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
529 &rdev->rfkill_ops, rdev);
530
531 if (!rdev->wiphy.rfkill) {
532 wiphy_free(&rdev->wiphy);
533 return NULL;
534 }
535
536 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
537 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
538 INIT_WORK(&rdev->event_work, cfg80211_event_work);
539 INIT_WORK(&rdev->background_cac_abort_wk,
540 cfg80211_background_cac_abort_wk);
541 INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
542 cfg80211_background_cac_done_wk);
543
544 init_waitqueue_head(&rdev->dev_wait);
545
546 /*
547 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
548 * Fragmentation and RTS threshold are disabled by default with the
549 * special -1 value.
550 */
551 rdev->wiphy.retry_short = 7;
552 rdev->wiphy.retry_long = 4;
553 rdev->wiphy.frag_threshold = (u32) -1;
554 rdev->wiphy.rts_threshold = (u32) -1;
555 rdev->wiphy.coverage_class = 0;
556
557 rdev->wiphy.max_num_csa_counters = 1;
558
559 rdev->wiphy.max_sched_scan_plans = 1;
560 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
561
562 return &rdev->wiphy;
563}
564EXPORT_SYMBOL(wiphy_new_nm);
565
566static int wiphy_verify_combinations(struct wiphy *wiphy)
567{
568 const struct ieee80211_iface_combination *c;
569 int i, j;
570
571 for (i = 0; i < wiphy->n_iface_combinations; i++) {
572 u32 cnt = 0;
573 u16 all_iftypes = 0;
574
575 c = &wiphy->iface_combinations[i];
576
577 /*
578 * Combinations with just one interface aren't real,
579 * however we make an exception for DFS.
580 */
581 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
582 return -EINVAL;
583
584 /* Need at least one channel */
585 if (WARN_ON(!c->num_different_channels))
586 return -EINVAL;
587
588 /* DFS only works on one channel. */
589 if (WARN_ON(c->radar_detect_widths &&
590 (c->num_different_channels > 1)))
591 return -EINVAL;
592
593 if (WARN_ON(!c->n_limits))
594 return -EINVAL;
595
596 for (j = 0; j < c->n_limits; j++) {
597 u16 types = c->limits[j].types;
598
599 /* interface types shouldn't overlap */
600 if (WARN_ON(types & all_iftypes))
601 return -EINVAL;
602 all_iftypes |= types;
603
604 if (WARN_ON(!c->limits[j].max))
605 return -EINVAL;
606
607 /* Shouldn't list software iftypes in combinations! */
608 if (WARN_ON(wiphy->software_iftypes & types))
609 return -EINVAL;
610
611 /* Only a single P2P_DEVICE can be allowed */
612 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
613 c->limits[j].max > 1))
614 return -EINVAL;
615
616 /* Only a single NAN can be allowed */
617 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
618 c->limits[j].max > 1))
619 return -EINVAL;
620
621 /*
622 * This isn't well-defined right now. If you have an
623 * IBSS interface, then its beacon interval may change
624 * by joining other networks, and nothing prevents it
625 * from doing that.
626 * So technically we probably shouldn't even allow AP
627 * and IBSS in the same interface, but it seems that
628 * some drivers support that, possibly only with fixed
629 * beacon intervals for IBSS.
630 */
631 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
632 c->beacon_int_min_gcd)) {
633 return -EINVAL;
634 }
635
636 cnt += c->limits[j].max;
637 /*
638 * Don't advertise an unsupported type
639 * in a combination.
640 */
641 if (WARN_ON((wiphy->interface_modes & types) != types))
642 return -EINVAL;
643 }
644
645 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
646 return -EINVAL;
647
648 /* You can't even choose that many! */
649 if (WARN_ON(cnt < c->max_interfaces))
650 return -EINVAL;
651 }
652
653 return 0;
654}
655
656int wiphy_register(struct wiphy *wiphy)
657{
658 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
659 int res;
660 enum nl80211_band band;
661 struct ieee80211_supported_band *sband;
662 bool have_band = false;
663 int i;
664 u16 ifmodes = wiphy->interface_modes;
665
666#ifdef CONFIG_PM
667 if (WARN_ON(wiphy->wowlan &&
668 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
669 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
670 return -EINVAL;
671 if (WARN_ON(wiphy->wowlan &&
672 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
673 !wiphy->wowlan->tcp))
674 return -EINVAL;
675#endif
676 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
677 (!rdev->ops->tdls_channel_switch ||
678 !rdev->ops->tdls_cancel_channel_switch)))
679 return -EINVAL;
680
681 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
682 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
683 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
684 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
685 return -EINVAL;
686
687 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
688 return -EINVAL;
689
690 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
691 return -EINVAL;
692
693 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
694 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
695 !wiphy->pmsr_capa->ftm.non_asap))
696 return -EINVAL;
697 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
698 !wiphy->pmsr_capa->ftm.bandwidths))
699 return -EINVAL;
700 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
701 ~(BIT(NL80211_PREAMBLE_LEGACY) |
702 BIT(NL80211_PREAMBLE_HT) |
703 BIT(NL80211_PREAMBLE_VHT) |
704 BIT(NL80211_PREAMBLE_HE) |
705 BIT(NL80211_PREAMBLE_DMG))))
706 return -EINVAL;
707 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
708 wiphy->pmsr_capa->ftm.non_trigger_based) &&
709 !(wiphy->pmsr_capa->ftm.preambles &
710 BIT(NL80211_PREAMBLE_HE))))
711 return -EINVAL;
712 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
713 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
714 BIT(NL80211_CHAN_WIDTH_20) |
715 BIT(NL80211_CHAN_WIDTH_40) |
716 BIT(NL80211_CHAN_WIDTH_80) |
717 BIT(NL80211_CHAN_WIDTH_80P80) |
718 BIT(NL80211_CHAN_WIDTH_160) |
719 BIT(NL80211_CHAN_WIDTH_5) |
720 BIT(NL80211_CHAN_WIDTH_10))))
721 return -EINVAL;
722 }
723
724 /*
725 * if a wiphy has unsupported modes for regulatory channel enforcement,
726 * opt-out of enforcement checking
727 */
728 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
729 BIT(NL80211_IFTYPE_P2P_CLIENT) |
730 BIT(NL80211_IFTYPE_AP) |
731 BIT(NL80211_IFTYPE_MESH_POINT) |
732 BIT(NL80211_IFTYPE_P2P_GO) |
733 BIT(NL80211_IFTYPE_ADHOC) |
734 BIT(NL80211_IFTYPE_P2P_DEVICE) |
735 BIT(NL80211_IFTYPE_NAN) |
736 BIT(NL80211_IFTYPE_AP_VLAN) |
737 BIT(NL80211_IFTYPE_MONITOR)))
738 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
739
740 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
741 (wiphy->regulatory_flags &
742 (REGULATORY_CUSTOM_REG |
743 REGULATORY_STRICT_REG |
744 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
745 REGULATORY_COUNTRY_IE_IGNORE))))
746 return -EINVAL;
747
748 if (WARN_ON(wiphy->coalesce &&
749 (!wiphy->coalesce->n_rules ||
750 !wiphy->coalesce->n_patterns) &&
751 (!wiphy->coalesce->pattern_min_len ||
752 wiphy->coalesce->pattern_min_len >
753 wiphy->coalesce->pattern_max_len)))
754 return -EINVAL;
755
756 if (WARN_ON(wiphy->ap_sme_capa &&
757 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
758 return -EINVAL;
759
760 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
761 return -EINVAL;
762
763 if (WARN_ON(wiphy->addresses &&
764 !is_zero_ether_addr(wiphy->perm_addr) &&
765 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
766 ETH_ALEN)))
767 return -EINVAL;
768
769 if (WARN_ON(wiphy->max_acl_mac_addrs &&
770 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
771 !rdev->ops->set_mac_acl)))
772 return -EINVAL;
773
774 /* assure only valid behaviours are flagged by driver
775 * hence subtract 2 as bit 0 is invalid.
776 */
777 if (WARN_ON(wiphy->bss_select_support &&
778 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
779 return -EINVAL;
780
781 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
782 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
783 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
784 return -EINVAL;
785
786 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
787 rdev->ops->update_connect_params))
788 return -EINVAL;
789
790 if (wiphy->addresses)
791 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
792
793 /* sanity check ifmodes */
794 WARN_ON(!ifmodes);
795 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
796 if (WARN_ON(ifmodes != wiphy->interface_modes))
797 wiphy->interface_modes = ifmodes;
798
799 res = wiphy_verify_combinations(wiphy);
800 if (res)
801 return res;
802
803 /* sanity check supported bands/channels */
804 for (band = 0; band < NUM_NL80211_BANDS; band++) {
805 u16 types = 0;
806 bool have_he = false;
807
808 sband = wiphy->bands[band];
809 if (!sband)
810 continue;
811
812 sband->band = band;
813 if (WARN_ON(!sband->n_channels))
814 return -EINVAL;
815 /*
816 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
817 * n_bitrates is 0
818 */
819 if (WARN_ON((band != NL80211_BAND_60GHZ &&
820 band != NL80211_BAND_S1GHZ) &&
821 !sband->n_bitrates))
822 return -EINVAL;
823
824 if (WARN_ON(band == NL80211_BAND_6GHZ &&
825 (sband->ht_cap.ht_supported ||
826 sband->vht_cap.vht_supported)))
827 return -EINVAL;
828
829 /*
830 * Since cfg80211_disable_40mhz_24ghz is global, we can
831 * modify the sband's ht data even if the driver uses a
832 * global structure for that.
833 */
834 if (cfg80211_disable_40mhz_24ghz &&
835 band == NL80211_BAND_2GHZ &&
836 sband->ht_cap.ht_supported) {
837 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
838 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
839 }
840
841 /*
842 * Since we use a u32 for rate bitmaps in
843 * ieee80211_get_response_rate, we cannot
844 * have more than 32 legacy rates.
845 */
846 if (WARN_ON(sband->n_bitrates > 32))
847 return -EINVAL;
848
849 for (i = 0; i < sband->n_channels; i++) {
850 sband->channels[i].orig_flags =
851 sband->channels[i].flags;
852 sband->channels[i].orig_mag = INT_MAX;
853 sband->channels[i].orig_mpwr =
854 sband->channels[i].max_power;
855 sband->channels[i].band = band;
856
857 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
858 return -EINVAL;
859 }
860
861 for (i = 0; i < sband->n_iftype_data; i++) {
862 const struct ieee80211_sband_iftype_data *iftd;
863 bool has_ap, has_non_ap;
864 u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
865 BIT(NL80211_IFTYPE_P2P_GO);
866
867 iftd = &sband->iftype_data[i];
868
869 if (WARN_ON(!iftd->types_mask))
870 return -EINVAL;
871 if (WARN_ON(types & iftd->types_mask))
872 return -EINVAL;
873
874 /* at least one piece of information must be present */
875 if (WARN_ON(!iftd->he_cap.has_he))
876 return -EINVAL;
877
878 types |= iftd->types_mask;
879
880 if (i == 0)
881 have_he = iftd->he_cap.has_he;
882 else
883 have_he = have_he &&
884 iftd->he_cap.has_he;
885
886 has_ap = iftd->types_mask & ap_bits;
887 has_non_ap = iftd->types_mask & ~ap_bits;
888
889 /*
890 * For EHT 20 MHz STA, the capabilities format differs
891 * but to simplify, don't check 20 MHz but rather check
892 * only if AP and non-AP were mentioned at the same time,
893 * reject if so.
894 */
895 if (WARN_ON(iftd->eht_cap.has_eht &&
896 has_ap && has_non_ap))
897 return -EINVAL;
898 }
899
900 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
901 return -EINVAL;
902
903 have_band = true;
904 }
905
906 if (!have_band) {
907 WARN_ON(1);
908 return -EINVAL;
909 }
910
911 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
912 /*
913 * Validate we have a policy (can be explicitly set to
914 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
915 * we have at least one of doit/dumpit.
916 */
917 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
918 return -EINVAL;
919 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
920 !rdev->wiphy.vendor_commands[i].dumpit))
921 return -EINVAL;
922 }
923
924#ifdef CONFIG_PM
925 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
926 (!rdev->wiphy.wowlan->pattern_min_len ||
927 rdev->wiphy.wowlan->pattern_min_len >
928 rdev->wiphy.wowlan->pattern_max_len)))
929 return -EINVAL;
930#endif
931
932 if (!wiphy->max_num_akm_suites)
933 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
934 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
935 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
936 return -EINVAL;
937
938 /* check and set up bitrates */
939 ieee80211_set_bitrate_flags(wiphy);
940
941 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
942
943 rtnl_lock();
944 res = device_add(&rdev->wiphy.dev);
945 if (res) {
946 rtnl_unlock();
947 return res;
948 }
949
950 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
951 cfg80211_rdev_list_generation++;
952
953 /* add to debugfs */
954 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
955 ieee80211_debugfs_dir);
956
957 cfg80211_debugfs_rdev_add(rdev);
958 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
959
960 /* set up regulatory info */
961 wiphy_regulatory_register(wiphy);
962
963 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
964 struct regulatory_request request;
965
966 request.wiphy_idx = get_wiphy_idx(wiphy);
967 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
968 request.alpha2[0] = '9';
969 request.alpha2[1] = '9';
970
971 nl80211_send_reg_change_event(&request);
972 }
973
974 /* Check that nobody globally advertises any capabilities they do not
975 * advertise on all possible interface types.
976 */
977 if (wiphy->extended_capabilities_len &&
978 wiphy->num_iftype_ext_capab &&
979 wiphy->iftype_ext_capab) {
980 u8 supported_on_all, j;
981 const struct wiphy_iftype_ext_capab *capab;
982
983 capab = wiphy->iftype_ext_capab;
984 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
985 if (capab[0].extended_capabilities_len > j)
986 supported_on_all =
987 capab[0].extended_capabilities[j];
988 else
989 supported_on_all = 0x00;
990 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
991 if (j >= capab[i].extended_capabilities_len) {
992 supported_on_all = 0x00;
993 break;
994 }
995 supported_on_all &=
996 capab[i].extended_capabilities[j];
997 }
998 if (WARN_ON(wiphy->extended_capabilities[j] &
999 ~supported_on_all))
1000 break;
1001 }
1002 }
1003
1004 rdev->wiphy.registered = true;
1005 rtnl_unlock();
1006
1007 res = rfkill_register(rdev->wiphy.rfkill);
1008 if (res) {
1009 rfkill_destroy(rdev->wiphy.rfkill);
1010 rdev->wiphy.rfkill = NULL;
1011 wiphy_unregister(&rdev->wiphy);
1012 return res;
1013 }
1014
1015 return 0;
1016}
1017EXPORT_SYMBOL(wiphy_register);
1018
1019void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1020{
1021 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1022
1023 if (!rdev->ops->rfkill_poll)
1024 return;
1025 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1026 rfkill_resume_polling(wiphy->rfkill);
1027}
1028EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1029
1030void wiphy_unregister(struct wiphy *wiphy)
1031{
1032 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1033
1034 wait_event(rdev->dev_wait, ({
1035 int __count;
1036 wiphy_lock(&rdev->wiphy);
1037 __count = rdev->opencount;
1038 wiphy_unlock(&rdev->wiphy);
1039 __count == 0; }));
1040
1041 if (rdev->wiphy.rfkill)
1042 rfkill_unregister(rdev->wiphy.rfkill);
1043
1044 rtnl_lock();
1045 wiphy_lock(&rdev->wiphy);
1046 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1047 rdev->wiphy.registered = false;
1048
1049 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1050
1051 /*
1052 * First remove the hardware from everywhere, this makes
1053 * it impossible to find from userspace.
1054 */
1055 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1056 list_del_rcu(&rdev->list);
1057 synchronize_rcu();
1058
1059 /*
1060 * If this device got a regulatory hint tell core its
1061 * free to listen now to a new shiny device regulatory hint
1062 */
1063 wiphy_regulatory_deregister(wiphy);
1064
1065 cfg80211_rdev_list_generation++;
1066 device_del(&rdev->wiphy.dev);
1067
1068 wiphy_unlock(&rdev->wiphy);
1069 rtnl_unlock();
1070
1071 flush_work(&rdev->scan_done_wk);
1072 cancel_work_sync(&rdev->conn_work);
1073 flush_work(&rdev->event_work);
1074 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1075 cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1076 flush_work(&rdev->destroy_work);
1077 flush_work(&rdev->sched_scan_stop_wk);
1078 flush_work(&rdev->propagate_radar_detect_wk);
1079 flush_work(&rdev->propagate_cac_done_wk);
1080 flush_work(&rdev->mgmt_registrations_update_wk);
1081 flush_work(&rdev->background_cac_abort_wk);
1082
1083#ifdef CONFIG_PM
1084 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1085 rdev_set_wakeup(rdev, false);
1086#endif
1087 cfg80211_rdev_free_wowlan(rdev);
1088 cfg80211_rdev_free_coalesce(rdev);
1089}
1090EXPORT_SYMBOL(wiphy_unregister);
1091
1092void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1093{
1094 struct cfg80211_internal_bss *scan, *tmp;
1095 struct cfg80211_beacon_registration *reg, *treg;
1096 rfkill_destroy(rdev->wiphy.rfkill);
1097 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1098 list_del(®->list);
1099 kfree(reg);
1100 }
1101 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1102 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1103 mutex_destroy(&rdev->wiphy.mtx);
1104
1105 /*
1106 * The 'regd' can only be non-NULL if we never finished
1107 * initializing the wiphy and thus never went through the
1108 * unregister path - e.g. in failure scenarios. Thus, it
1109 * cannot have been visible to anyone if non-NULL, so we
1110 * can just free it here.
1111 */
1112 kfree(rcu_dereference_raw(rdev->wiphy.regd));
1113
1114 kfree(rdev);
1115}
1116
1117void wiphy_free(struct wiphy *wiphy)
1118{
1119 put_device(&wiphy->dev);
1120}
1121EXPORT_SYMBOL(wiphy_free);
1122
1123void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1124 enum rfkill_hard_block_reasons reason)
1125{
1126 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1127
1128 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1129 schedule_work(&rdev->rfkill_block);
1130}
1131EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1132
1133void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1134{
1135 kfree(wdev->cqm_config);
1136 wdev->cqm_config = NULL;
1137}
1138
1139static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1140 bool unregister_netdev)
1141{
1142 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1143 unsigned int link_id;
1144
1145 ASSERT_RTNL();
1146 lockdep_assert_held(&rdev->wiphy.mtx);
1147
1148 flush_work(&wdev->pmsr_free_wk);
1149
1150 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1151
1152 wdev->registered = false;
1153
1154 if (wdev->netdev) {
1155 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1156 if (unregister_netdev)
1157 unregister_netdevice(wdev->netdev);
1158 }
1159
1160 list_del_rcu(&wdev->list);
1161 synchronize_net();
1162 rdev->devlist_generation++;
1163
1164 cfg80211_mlme_purge_registrations(wdev);
1165
1166 switch (wdev->iftype) {
1167 case NL80211_IFTYPE_P2P_DEVICE:
1168 cfg80211_stop_p2p_device(rdev, wdev);
1169 break;
1170 case NL80211_IFTYPE_NAN:
1171 cfg80211_stop_nan(rdev, wdev);
1172 break;
1173 default:
1174 break;
1175 }
1176
1177#ifdef CONFIG_CFG80211_WEXT
1178 kfree_sensitive(wdev->wext.keys);
1179 wdev->wext.keys = NULL;
1180#endif
1181 /* only initialized if we have a netdev */
1182 if (wdev->netdev)
1183 flush_work(&wdev->disconnect_wk);
1184
1185 cfg80211_cqm_config_free(wdev);
1186
1187 /*
1188 * Ensure that all events have been processed and
1189 * freed.
1190 */
1191 cfg80211_process_wdev_events(wdev);
1192
1193 if (wdev->iftype == NL80211_IFTYPE_STATION ||
1194 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1195 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1196 struct cfg80211_internal_bss *curbss;
1197
1198 curbss = wdev->links[link_id].client.current_bss;
1199
1200 if (WARN_ON(curbss)) {
1201 cfg80211_unhold_bss(curbss);
1202 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1203 wdev->links[link_id].client.current_bss = NULL;
1204 }
1205 }
1206 }
1207
1208 wdev->connected = false;
1209}
1210
1211void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1212{
1213 _cfg80211_unregister_wdev(wdev, true);
1214}
1215EXPORT_SYMBOL(cfg80211_unregister_wdev);
1216
1217static const struct device_type wiphy_type = {
1218 .name = "wlan",
1219};
1220
1221void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1222 enum nl80211_iftype iftype, int num)
1223{
1224 lockdep_assert_held(&rdev->wiphy.mtx);
1225
1226 rdev->num_running_ifaces += num;
1227 if (iftype == NL80211_IFTYPE_MONITOR)
1228 rdev->num_running_monitor_ifaces += num;
1229}
1230
1231void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1232 struct wireless_dev *wdev)
1233{
1234 struct net_device *dev = wdev->netdev;
1235 struct cfg80211_sched_scan_request *pos, *tmp;
1236
1237 lockdep_assert_held(&rdev->wiphy.mtx);
1238 ASSERT_WDEV_LOCK(wdev);
1239
1240 cfg80211_pmsr_wdev_down(wdev);
1241
1242 cfg80211_stop_background_radar_detection(wdev);
1243
1244 switch (wdev->iftype) {
1245 case NL80211_IFTYPE_ADHOC:
1246 __cfg80211_leave_ibss(rdev, dev, true);
1247 break;
1248 case NL80211_IFTYPE_P2P_CLIENT:
1249 case NL80211_IFTYPE_STATION:
1250 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1251 list) {
1252 if (dev == pos->dev)
1253 cfg80211_stop_sched_scan_req(rdev, pos, false);
1254 }
1255
1256#ifdef CONFIG_CFG80211_WEXT
1257 kfree(wdev->wext.ie);
1258 wdev->wext.ie = NULL;
1259 wdev->wext.ie_len = 0;
1260 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1261#endif
1262 cfg80211_disconnect(rdev, dev,
1263 WLAN_REASON_DEAUTH_LEAVING, true);
1264 break;
1265 case NL80211_IFTYPE_MESH_POINT:
1266 __cfg80211_leave_mesh(rdev, dev);
1267 break;
1268 case NL80211_IFTYPE_AP:
1269 case NL80211_IFTYPE_P2P_GO:
1270 __cfg80211_stop_ap(rdev, dev, -1, true);
1271 break;
1272 case NL80211_IFTYPE_OCB:
1273 __cfg80211_leave_ocb(rdev, dev);
1274 break;
1275 case NL80211_IFTYPE_P2P_DEVICE:
1276 case NL80211_IFTYPE_NAN:
1277 /* cannot happen, has no netdev */
1278 break;
1279 case NL80211_IFTYPE_AP_VLAN:
1280 case NL80211_IFTYPE_MONITOR:
1281 /* nothing to do */
1282 break;
1283 case NL80211_IFTYPE_UNSPECIFIED:
1284 case NL80211_IFTYPE_WDS:
1285 case NUM_NL80211_IFTYPES:
1286 /* invalid */
1287 break;
1288 }
1289}
1290
1291void cfg80211_leave(struct cfg80211_registered_device *rdev,
1292 struct wireless_dev *wdev)
1293{
1294 wdev_lock(wdev);
1295 __cfg80211_leave(rdev, wdev);
1296 wdev_unlock(wdev);
1297}
1298
1299void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1300 gfp_t gfp)
1301{
1302 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1303 struct cfg80211_event *ev;
1304 unsigned long flags;
1305
1306 trace_cfg80211_stop_iface(wiphy, wdev);
1307
1308 ev = kzalloc(sizeof(*ev), gfp);
1309 if (!ev)
1310 return;
1311
1312 ev->type = EVENT_STOPPED;
1313
1314 spin_lock_irqsave(&wdev->event_lock, flags);
1315 list_add_tail(&ev->list, &wdev->event_list);
1316 spin_unlock_irqrestore(&wdev->event_lock, flags);
1317 queue_work(cfg80211_wq, &rdev->event_work);
1318}
1319EXPORT_SYMBOL(cfg80211_stop_iface);
1320
1321void cfg80211_init_wdev(struct wireless_dev *wdev)
1322{
1323 mutex_init(&wdev->mtx);
1324 INIT_LIST_HEAD(&wdev->event_list);
1325 spin_lock_init(&wdev->event_lock);
1326 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1327 INIT_LIST_HEAD(&wdev->pmsr_list);
1328 spin_lock_init(&wdev->pmsr_lock);
1329 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1330
1331#ifdef CONFIG_CFG80211_WEXT
1332 wdev->wext.default_key = -1;
1333 wdev->wext.default_mgmt_key = -1;
1334 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1335#endif
1336
1337 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1338 wdev->ps = true;
1339 else
1340 wdev->ps = false;
1341 /* allow mac80211 to determine the timeout */
1342 wdev->ps_timeout = -1;
1343
1344 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1345 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1346 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1347 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1348
1349 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1350}
1351
1352void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1353 struct wireless_dev *wdev)
1354{
1355 ASSERT_RTNL();
1356 lockdep_assert_held(&rdev->wiphy.mtx);
1357
1358 /*
1359 * We get here also when the interface changes network namespaces,
1360 * as it's registered into the new one, but we don't want it to
1361 * change ID in that case. Checking if the ID is already assigned
1362 * works, because 0 isn't considered a valid ID and the memory is
1363 * 0-initialized.
1364 */
1365 if (!wdev->identifier)
1366 wdev->identifier = ++rdev->wdev_id;
1367 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1368 rdev->devlist_generation++;
1369 wdev->registered = true;
1370
1371 if (wdev->netdev &&
1372 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1373 "phy80211"))
1374 pr_err("failed to add phy80211 symlink to netdev!\n");
1375
1376 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1377}
1378
1379int cfg80211_register_netdevice(struct net_device *dev)
1380{
1381 struct wireless_dev *wdev = dev->ieee80211_ptr;
1382 struct cfg80211_registered_device *rdev;
1383 int ret;
1384
1385 ASSERT_RTNL();
1386
1387 if (WARN_ON(!wdev))
1388 return -EINVAL;
1389
1390 rdev = wiphy_to_rdev(wdev->wiphy);
1391
1392 lockdep_assert_held(&rdev->wiphy.mtx);
1393
1394 /* we'll take care of this */
1395 wdev->registered = true;
1396 wdev->registering = true;
1397 ret = register_netdevice(dev);
1398 if (ret)
1399 goto out;
1400
1401 cfg80211_register_wdev(rdev, wdev);
1402 ret = 0;
1403out:
1404 wdev->registering = false;
1405 if (ret)
1406 wdev->registered = false;
1407 return ret;
1408}
1409EXPORT_SYMBOL(cfg80211_register_netdevice);
1410
1411static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1412 unsigned long state, void *ptr)
1413{
1414 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1415 struct wireless_dev *wdev = dev->ieee80211_ptr;
1416 struct cfg80211_registered_device *rdev;
1417 struct cfg80211_sched_scan_request *pos, *tmp;
1418
1419 if (!wdev)
1420 return NOTIFY_DONE;
1421
1422 rdev = wiphy_to_rdev(wdev->wiphy);
1423
1424 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1425
1426 switch (state) {
1427 case NETDEV_POST_INIT:
1428 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1429 wdev->netdev = dev;
1430 /* can only change netns with wiphy */
1431 dev->features |= NETIF_F_NETNS_LOCAL;
1432
1433 cfg80211_init_wdev(wdev);
1434 break;
1435 case NETDEV_REGISTER:
1436 if (!wdev->registered) {
1437 wiphy_lock(&rdev->wiphy);
1438 cfg80211_register_wdev(rdev, wdev);
1439 wiphy_unlock(&rdev->wiphy);
1440 }
1441 break;
1442 case NETDEV_UNREGISTER:
1443 /*
1444 * It is possible to get NETDEV_UNREGISTER multiple times,
1445 * so check wdev->registered.
1446 */
1447 if (wdev->registered && !wdev->registering) {
1448 wiphy_lock(&rdev->wiphy);
1449 _cfg80211_unregister_wdev(wdev, false);
1450 wiphy_unlock(&rdev->wiphy);
1451 }
1452 break;
1453 case NETDEV_GOING_DOWN:
1454 wiphy_lock(&rdev->wiphy);
1455 cfg80211_leave(rdev, wdev);
1456 cfg80211_remove_links(wdev);
1457 wiphy_unlock(&rdev->wiphy);
1458 break;
1459 case NETDEV_DOWN:
1460 wiphy_lock(&rdev->wiphy);
1461 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1462 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1463 if (WARN_ON(!rdev->scan_req->notified &&
1464 (!rdev->int_scan_req ||
1465 !rdev->int_scan_req->notified)))
1466 rdev->scan_req->info.aborted = true;
1467 ___cfg80211_scan_done(rdev, false);
1468 }
1469
1470 list_for_each_entry_safe(pos, tmp,
1471 &rdev->sched_scan_req_list, list) {
1472 if (WARN_ON(pos->dev == wdev->netdev))
1473 cfg80211_stop_sched_scan_req(rdev, pos, false);
1474 }
1475
1476 rdev->opencount--;
1477 wiphy_unlock(&rdev->wiphy);
1478 wake_up(&rdev->dev_wait);
1479 break;
1480 case NETDEV_UP:
1481 wiphy_lock(&rdev->wiphy);
1482 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1483 wdev_lock(wdev);
1484 switch (wdev->iftype) {
1485#ifdef CONFIG_CFG80211_WEXT
1486 case NL80211_IFTYPE_ADHOC:
1487 cfg80211_ibss_wext_join(rdev, wdev);
1488 break;
1489 case NL80211_IFTYPE_STATION:
1490 cfg80211_mgd_wext_connect(rdev, wdev);
1491 break;
1492#endif
1493#ifdef CONFIG_MAC80211_MESH
1494 case NL80211_IFTYPE_MESH_POINT:
1495 {
1496 /* backward compat code... */
1497 struct mesh_setup setup;
1498 memcpy(&setup, &default_mesh_setup,
1499 sizeof(setup));
1500 /* back compat only needed for mesh_id */
1501 setup.mesh_id = wdev->u.mesh.id;
1502 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1503 if (wdev->u.mesh.id_up_len)
1504 __cfg80211_join_mesh(rdev, dev,
1505 &setup,
1506 &default_mesh_config);
1507 break;
1508 }
1509#endif
1510 default:
1511 break;
1512 }
1513 wdev_unlock(wdev);
1514 rdev->opencount++;
1515
1516 /*
1517 * Configure power management to the driver here so that its
1518 * correctly set also after interface type changes etc.
1519 */
1520 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1521 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1522 rdev->ops->set_power_mgmt &&
1523 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1524 wdev->ps_timeout)) {
1525 /* assume this means it's off */
1526 wdev->ps = false;
1527 }
1528 wiphy_unlock(&rdev->wiphy);
1529 break;
1530 case NETDEV_PRE_UP:
1531 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1532 wdev->use_4addr, 0))
1533 return notifier_from_errno(-EOPNOTSUPP);
1534
1535 if (rfkill_blocked(rdev->wiphy.rfkill))
1536 return notifier_from_errno(-ERFKILL);
1537 break;
1538 default:
1539 return NOTIFY_DONE;
1540 }
1541
1542 wireless_nlevent_flush();
1543
1544 return NOTIFY_OK;
1545}
1546
1547static struct notifier_block cfg80211_netdev_notifier = {
1548 .notifier_call = cfg80211_netdev_notifier_call,
1549};
1550
1551static void __net_exit cfg80211_pernet_exit(struct net *net)
1552{
1553 struct cfg80211_registered_device *rdev;
1554
1555 rtnl_lock();
1556 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1557 if (net_eq(wiphy_net(&rdev->wiphy), net))
1558 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1559 }
1560 rtnl_unlock();
1561}
1562
1563static struct pernet_operations cfg80211_pernet_ops = {
1564 .exit = cfg80211_pernet_exit,
1565};
1566
1567static int __init cfg80211_init(void)
1568{
1569 int err;
1570
1571 err = register_pernet_device(&cfg80211_pernet_ops);
1572 if (err)
1573 goto out_fail_pernet;
1574
1575 err = wiphy_sysfs_init();
1576 if (err)
1577 goto out_fail_sysfs;
1578
1579 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1580 if (err)
1581 goto out_fail_notifier;
1582
1583 err = nl80211_init();
1584 if (err)
1585 goto out_fail_nl80211;
1586
1587 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1588
1589 err = regulatory_init();
1590 if (err)
1591 goto out_fail_reg;
1592
1593 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1594 if (!cfg80211_wq) {
1595 err = -ENOMEM;
1596 goto out_fail_wq;
1597 }
1598
1599 return 0;
1600
1601out_fail_wq:
1602 regulatory_exit();
1603out_fail_reg:
1604 debugfs_remove(ieee80211_debugfs_dir);
1605 nl80211_exit();
1606out_fail_nl80211:
1607 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1608out_fail_notifier:
1609 wiphy_sysfs_exit();
1610out_fail_sysfs:
1611 unregister_pernet_device(&cfg80211_pernet_ops);
1612out_fail_pernet:
1613 return err;
1614}
1615fs_initcall(cfg80211_init);
1616
1617static void __exit cfg80211_exit(void)
1618{
1619 debugfs_remove(ieee80211_debugfs_dir);
1620 nl80211_exit();
1621 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1622 wiphy_sysfs_exit();
1623 regulatory_exit();
1624 unregister_pernet_device(&cfg80211_pernet_ops);
1625 destroy_workqueue(cfg80211_wq);
1626}
1627module_exit(cfg80211_exit);