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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) 2018-2020 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 ASSERT_RTNL();
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->scan_req->info.aborted = true;
241 ___cfg80211_scan_done(rdev, false);
242 }
243}
244
245void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
246 struct wireless_dev *wdev)
247{
248 ASSERT_RTNL();
249
250 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
251 return;
252
253 if (!wdev_running(wdev))
254 return;
255
256 rdev_stop_nan(rdev, wdev);
257 wdev->is_running = false;
258
259 rdev->opencount--;
260}
261
262void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
263{
264 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
265 struct wireless_dev *wdev;
266
267 ASSERT_RTNL();
268
269 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
270 if (wdev->netdev) {
271 dev_close(wdev->netdev);
272 continue;
273 }
274 /* otherwise, check iftype */
275 switch (wdev->iftype) {
276 case NL80211_IFTYPE_P2P_DEVICE:
277 cfg80211_stop_p2p_device(rdev, wdev);
278 break;
279 case NL80211_IFTYPE_NAN:
280 cfg80211_stop_nan(rdev, wdev);
281 break;
282 default:
283 break;
284 }
285 }
286}
287EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
288
289static int cfg80211_rfkill_set_block(void *data, bool blocked)
290{
291 struct cfg80211_registered_device *rdev = data;
292
293 if (!blocked)
294 return 0;
295
296 rtnl_lock();
297 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
298 rtnl_unlock();
299
300 return 0;
301}
302
303static void cfg80211_rfkill_block_work(struct work_struct *work)
304{
305 struct cfg80211_registered_device *rdev;
306
307 rdev = container_of(work, struct cfg80211_registered_device,
308 rfkill_block);
309 cfg80211_rfkill_set_block(rdev, true);
310}
311
312static void cfg80211_event_work(struct work_struct *work)
313{
314 struct cfg80211_registered_device *rdev;
315
316 rdev = container_of(work, struct cfg80211_registered_device,
317 event_work);
318
319 rtnl_lock();
320 cfg80211_process_rdev_events(rdev);
321 rtnl_unlock();
322}
323
324void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
325{
326 struct wireless_dev *wdev, *tmp;
327
328 ASSERT_RTNL();
329
330 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
331 if (wdev->nl_owner_dead)
332 rdev_del_virtual_intf(rdev, wdev);
333 }
334}
335
336static void cfg80211_destroy_iface_wk(struct work_struct *work)
337{
338 struct cfg80211_registered_device *rdev;
339
340 rdev = container_of(work, struct cfg80211_registered_device,
341 destroy_work);
342
343 rtnl_lock();
344 cfg80211_destroy_ifaces(rdev);
345 rtnl_unlock();
346}
347
348static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
349{
350 struct cfg80211_registered_device *rdev;
351 struct cfg80211_sched_scan_request *req, *tmp;
352
353 rdev = container_of(work, struct cfg80211_registered_device,
354 sched_scan_stop_wk);
355
356 rtnl_lock();
357 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
358 if (req->nl_owner_dead)
359 cfg80211_stop_sched_scan_req(rdev, req, false);
360 }
361 rtnl_unlock();
362}
363
364static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
365{
366 struct cfg80211_registered_device *rdev;
367
368 rdev = container_of(work, struct cfg80211_registered_device,
369 propagate_radar_detect_wk);
370
371 rtnl_lock();
372
373 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
374 NL80211_DFS_UNAVAILABLE,
375 NL80211_RADAR_DETECTED);
376
377 rtnl_unlock();
378}
379
380static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
381{
382 struct cfg80211_registered_device *rdev;
383
384 rdev = container_of(work, struct cfg80211_registered_device,
385 propagate_cac_done_wk);
386
387 rtnl_lock();
388
389 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
390 NL80211_DFS_AVAILABLE,
391 NL80211_RADAR_CAC_FINISHED);
392
393 rtnl_unlock();
394}
395
396/* exported functions */
397
398struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
399 const char *requested_name)
400{
401 static atomic_t wiphy_counter = ATOMIC_INIT(0);
402
403 struct cfg80211_registered_device *rdev;
404 int alloc_size;
405
406 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
407 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
408 WARN_ON(ops->connect && !ops->disconnect);
409 WARN_ON(ops->join_ibss && !ops->leave_ibss);
410 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
411 WARN_ON(ops->add_station && !ops->del_station);
412 WARN_ON(ops->add_mpath && !ops->del_mpath);
413 WARN_ON(ops->join_mesh && !ops->leave_mesh);
414 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
415 WARN_ON(ops->start_ap && !ops->stop_ap);
416 WARN_ON(ops->join_ocb && !ops->leave_ocb);
417 WARN_ON(ops->suspend && !ops->resume);
418 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
419 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
420 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
421 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
422
423 alloc_size = sizeof(*rdev) + sizeof_priv;
424
425 rdev = kzalloc(alloc_size, GFP_KERNEL);
426 if (!rdev)
427 return NULL;
428
429 rdev->ops = ops;
430
431 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
432
433 if (unlikely(rdev->wiphy_idx < 0)) {
434 /* ugh, wrapped! */
435 atomic_dec(&wiphy_counter);
436 kfree(rdev);
437 return NULL;
438 }
439
440 /* atomic_inc_return makes it start at 1, make it start at 0 */
441 rdev->wiphy_idx--;
442
443 /* give it a proper name */
444 if (requested_name && requested_name[0]) {
445 int rv;
446
447 rtnl_lock();
448 rv = cfg80211_dev_check_name(rdev, requested_name);
449
450 if (rv < 0) {
451 rtnl_unlock();
452 goto use_default_name;
453 }
454
455 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
456 rtnl_unlock();
457 if (rv)
458 goto use_default_name;
459 } else {
460 int rv;
461
462use_default_name:
463 /* NOTE: This is *probably* safe w/out holding rtnl because of
464 * the restrictions on phy names. Probably this call could
465 * fail if some other part of the kernel (re)named a device
466 * phyX. But, might should add some locking and check return
467 * value, and use a different name if this one exists?
468 */
469 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
470 if (rv < 0) {
471 kfree(rdev);
472 return NULL;
473 }
474 }
475
476 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
477 INIT_LIST_HEAD(&rdev->beacon_registrations);
478 spin_lock_init(&rdev->beacon_registrations_lock);
479 spin_lock_init(&rdev->bss_lock);
480 INIT_LIST_HEAD(&rdev->bss_list);
481 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
482 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
483 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
484 cfg80211_dfs_channels_update_work);
485#ifdef CONFIG_CFG80211_WEXT
486 rdev->wiphy.wext = &cfg80211_wext_handler;
487#endif
488
489 device_initialize(&rdev->wiphy.dev);
490 rdev->wiphy.dev.class = &ieee80211_class;
491 rdev->wiphy.dev.platform_data = rdev;
492 device_enable_async_suspend(&rdev->wiphy.dev);
493
494 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
495 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
496 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
497 INIT_WORK(&rdev->propagate_radar_detect_wk,
498 cfg80211_propagate_radar_detect_wk);
499 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
500 INIT_WORK(&rdev->mgmt_registrations_update_wk,
501 cfg80211_mgmt_registrations_update_wk);
502
503#ifdef CONFIG_CFG80211_DEFAULT_PS
504 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
505#endif
506
507 wiphy_net_set(&rdev->wiphy, &init_net);
508
509 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
510 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
511 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
512 &rdev->rfkill_ops, rdev);
513
514 if (!rdev->rfkill) {
515 wiphy_free(&rdev->wiphy);
516 return NULL;
517 }
518
519 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
520 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
521 INIT_WORK(&rdev->event_work, cfg80211_event_work);
522
523 init_waitqueue_head(&rdev->dev_wait);
524
525 /*
526 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
527 * Fragmentation and RTS threshold are disabled by default with the
528 * special -1 value.
529 */
530 rdev->wiphy.retry_short = 7;
531 rdev->wiphy.retry_long = 4;
532 rdev->wiphy.frag_threshold = (u32) -1;
533 rdev->wiphy.rts_threshold = (u32) -1;
534 rdev->wiphy.coverage_class = 0;
535
536 rdev->wiphy.max_num_csa_counters = 1;
537
538 rdev->wiphy.max_sched_scan_plans = 1;
539 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
540
541 return &rdev->wiphy;
542}
543EXPORT_SYMBOL(wiphy_new_nm);
544
545static int wiphy_verify_combinations(struct wiphy *wiphy)
546{
547 const struct ieee80211_iface_combination *c;
548 int i, j;
549
550 for (i = 0; i < wiphy->n_iface_combinations; i++) {
551 u32 cnt = 0;
552 u16 all_iftypes = 0;
553
554 c = &wiphy->iface_combinations[i];
555
556 /*
557 * Combinations with just one interface aren't real,
558 * however we make an exception for DFS.
559 */
560 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
561 return -EINVAL;
562
563 /* Need at least one channel */
564 if (WARN_ON(!c->num_different_channels))
565 return -EINVAL;
566
567 /*
568 * Put a sane limit on maximum number of different
569 * channels to simplify channel accounting code.
570 */
571 if (WARN_ON(c->num_different_channels >
572 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
573 return -EINVAL;
574
575 /* DFS only works on one channel. */
576 if (WARN_ON(c->radar_detect_widths &&
577 (c->num_different_channels > 1)))
578 return -EINVAL;
579
580 if (WARN_ON(!c->n_limits))
581 return -EINVAL;
582
583 for (j = 0; j < c->n_limits; j++) {
584 u16 types = c->limits[j].types;
585
586 /* interface types shouldn't overlap */
587 if (WARN_ON(types & all_iftypes))
588 return -EINVAL;
589 all_iftypes |= types;
590
591 if (WARN_ON(!c->limits[j].max))
592 return -EINVAL;
593
594 /* Shouldn't list software iftypes in combinations! */
595 if (WARN_ON(wiphy->software_iftypes & types))
596 return -EINVAL;
597
598 /* Only a single P2P_DEVICE can be allowed */
599 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
600 c->limits[j].max > 1))
601 return -EINVAL;
602
603 /* Only a single NAN can be allowed */
604 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
605 c->limits[j].max > 1))
606 return -EINVAL;
607
608 /*
609 * This isn't well-defined right now. If you have an
610 * IBSS interface, then its beacon interval may change
611 * by joining other networks, and nothing prevents it
612 * from doing that.
613 * So technically we probably shouldn't even allow AP
614 * and IBSS in the same interface, but it seems that
615 * some drivers support that, possibly only with fixed
616 * beacon intervals for IBSS.
617 */
618 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
619 c->beacon_int_min_gcd)) {
620 return -EINVAL;
621 }
622
623 cnt += c->limits[j].max;
624 /*
625 * Don't advertise an unsupported type
626 * in a combination.
627 */
628 if (WARN_ON((wiphy->interface_modes & types) != types))
629 return -EINVAL;
630 }
631
632#ifndef CONFIG_WIRELESS_WDS
633 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
634 return -EINVAL;
635#endif
636
637 /* You can't even choose that many! */
638 if (WARN_ON(cnt < c->max_interfaces))
639 return -EINVAL;
640 }
641
642 return 0;
643}
644
645int wiphy_register(struct wiphy *wiphy)
646{
647 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
648 int res;
649 enum nl80211_band band;
650 struct ieee80211_supported_band *sband;
651 bool have_band = false;
652 int i;
653 u16 ifmodes = wiphy->interface_modes;
654
655#ifdef CONFIG_PM
656 if (WARN_ON(wiphy->wowlan &&
657 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
658 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
659 return -EINVAL;
660 if (WARN_ON(wiphy->wowlan &&
661 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
662 !wiphy->wowlan->tcp))
663 return -EINVAL;
664#endif
665 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
666 (!rdev->ops->tdls_channel_switch ||
667 !rdev->ops->tdls_cancel_channel_switch)))
668 return -EINVAL;
669
670 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
671 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
672 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
673 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
674 return -EINVAL;
675
676#ifndef CONFIG_WIRELESS_WDS
677 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
678 return -EINVAL;
679#endif
680
681 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
682 return -EINVAL;
683
684 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
685 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
686 !wiphy->pmsr_capa->ftm.non_asap))
687 return -EINVAL;
688 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
689 !wiphy->pmsr_capa->ftm.bandwidths))
690 return -EINVAL;
691 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
692 ~(BIT(NL80211_PREAMBLE_LEGACY) |
693 BIT(NL80211_PREAMBLE_HT) |
694 BIT(NL80211_PREAMBLE_VHT) |
695 BIT(NL80211_PREAMBLE_HE) |
696 BIT(NL80211_PREAMBLE_DMG))))
697 return -EINVAL;
698 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
699 wiphy->pmsr_capa->ftm.non_trigger_based) &&
700 !(wiphy->pmsr_capa->ftm.preambles &
701 BIT(NL80211_PREAMBLE_HE))))
702 return -EINVAL;
703 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
704 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
705 BIT(NL80211_CHAN_WIDTH_20) |
706 BIT(NL80211_CHAN_WIDTH_40) |
707 BIT(NL80211_CHAN_WIDTH_80) |
708 BIT(NL80211_CHAN_WIDTH_80P80) |
709 BIT(NL80211_CHAN_WIDTH_160) |
710 BIT(NL80211_CHAN_WIDTH_5) |
711 BIT(NL80211_CHAN_WIDTH_10))))
712 return -EINVAL;
713 }
714
715 /*
716 * if a wiphy has unsupported modes for regulatory channel enforcement,
717 * opt-out of enforcement checking
718 */
719 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
720 BIT(NL80211_IFTYPE_P2P_CLIENT) |
721 BIT(NL80211_IFTYPE_AP) |
722 BIT(NL80211_IFTYPE_P2P_GO) |
723 BIT(NL80211_IFTYPE_ADHOC) |
724 BIT(NL80211_IFTYPE_P2P_DEVICE) |
725 BIT(NL80211_IFTYPE_NAN) |
726 BIT(NL80211_IFTYPE_AP_VLAN) |
727 BIT(NL80211_IFTYPE_MONITOR)))
728 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
729
730 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
731 (wiphy->regulatory_flags &
732 (REGULATORY_CUSTOM_REG |
733 REGULATORY_STRICT_REG |
734 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
735 REGULATORY_COUNTRY_IE_IGNORE))))
736 return -EINVAL;
737
738 if (WARN_ON(wiphy->coalesce &&
739 (!wiphy->coalesce->n_rules ||
740 !wiphy->coalesce->n_patterns) &&
741 (!wiphy->coalesce->pattern_min_len ||
742 wiphy->coalesce->pattern_min_len >
743 wiphy->coalesce->pattern_max_len)))
744 return -EINVAL;
745
746 if (WARN_ON(wiphy->ap_sme_capa &&
747 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
748 return -EINVAL;
749
750 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
751 return -EINVAL;
752
753 if (WARN_ON(wiphy->addresses &&
754 !is_zero_ether_addr(wiphy->perm_addr) &&
755 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
756 ETH_ALEN)))
757 return -EINVAL;
758
759 if (WARN_ON(wiphy->max_acl_mac_addrs &&
760 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
761 !rdev->ops->set_mac_acl)))
762 return -EINVAL;
763
764 /* assure only valid behaviours are flagged by driver
765 * hence subtract 2 as bit 0 is invalid.
766 */
767 if (WARN_ON(wiphy->bss_select_support &&
768 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
769 return -EINVAL;
770
771 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
772 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
773 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
774 return -EINVAL;
775
776 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
777 rdev->ops->update_connect_params))
778 return -EINVAL;
779
780 if (wiphy->addresses)
781 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
782
783 /* sanity check ifmodes */
784 WARN_ON(!ifmodes);
785 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
786 if (WARN_ON(ifmodes != wiphy->interface_modes))
787 wiphy->interface_modes = ifmodes;
788
789 res = wiphy_verify_combinations(wiphy);
790 if (res)
791 return res;
792
793 /* sanity check supported bands/channels */
794 for (band = 0; band < NUM_NL80211_BANDS; band++) {
795 u16 types = 0;
796 bool have_he = false;
797
798 sband = wiphy->bands[band];
799 if (!sband)
800 continue;
801
802 sband->band = band;
803 if (WARN_ON(!sband->n_channels))
804 return -EINVAL;
805 /*
806 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
807 * n_bitrates is 0
808 */
809 if (WARN_ON((band != NL80211_BAND_60GHZ &&
810 band != NL80211_BAND_S1GHZ) &&
811 !sband->n_bitrates))
812 return -EINVAL;
813
814 if (WARN_ON(band == NL80211_BAND_6GHZ &&
815 (sband->ht_cap.ht_supported ||
816 sband->vht_cap.vht_supported)))
817 return -EINVAL;
818
819 /*
820 * Since cfg80211_disable_40mhz_24ghz is global, we can
821 * modify the sband's ht data even if the driver uses a
822 * global structure for that.
823 */
824 if (cfg80211_disable_40mhz_24ghz &&
825 band == NL80211_BAND_2GHZ &&
826 sband->ht_cap.ht_supported) {
827 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
828 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
829 }
830
831 /*
832 * Since we use a u32 for rate bitmaps in
833 * ieee80211_get_response_rate, we cannot
834 * have more than 32 legacy rates.
835 */
836 if (WARN_ON(sband->n_bitrates > 32))
837 return -EINVAL;
838
839 for (i = 0; i < sband->n_channels; i++) {
840 sband->channels[i].orig_flags =
841 sband->channels[i].flags;
842 sband->channels[i].orig_mag = INT_MAX;
843 sband->channels[i].orig_mpwr =
844 sband->channels[i].max_power;
845 sband->channels[i].band = band;
846
847 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
848 return -EINVAL;
849 }
850
851 for (i = 0; i < sband->n_iftype_data; i++) {
852 const struct ieee80211_sband_iftype_data *iftd;
853
854 iftd = &sband->iftype_data[i];
855
856 if (WARN_ON(!iftd->types_mask))
857 return -EINVAL;
858 if (WARN_ON(types & iftd->types_mask))
859 return -EINVAL;
860
861 /* at least one piece of information must be present */
862 if (WARN_ON(!iftd->he_cap.has_he))
863 return -EINVAL;
864
865 types |= iftd->types_mask;
866
867 if (i == 0)
868 have_he = iftd->he_cap.has_he;
869 else
870 have_he = have_he &&
871 iftd->he_cap.has_he;
872 }
873
874 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
875 return -EINVAL;
876
877 have_band = true;
878 }
879
880 if (!have_band) {
881 WARN_ON(1);
882 return -EINVAL;
883 }
884
885 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
886 /*
887 * Validate we have a policy (can be explicitly set to
888 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
889 * we have at least one of doit/dumpit.
890 */
891 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
892 return -EINVAL;
893 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
894 !rdev->wiphy.vendor_commands[i].dumpit))
895 return -EINVAL;
896 }
897
898#ifdef CONFIG_PM
899 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
900 (!rdev->wiphy.wowlan->pattern_min_len ||
901 rdev->wiphy.wowlan->pattern_min_len >
902 rdev->wiphy.wowlan->pattern_max_len)))
903 return -EINVAL;
904#endif
905
906 /* check and set up bitrates */
907 ieee80211_set_bitrate_flags(wiphy);
908
909 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
910
911 rtnl_lock();
912 res = device_add(&rdev->wiphy.dev);
913 if (res) {
914 rtnl_unlock();
915 return res;
916 }
917
918 /* set up regulatory info */
919 wiphy_regulatory_register(wiphy);
920
921 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
922 cfg80211_rdev_list_generation++;
923
924 /* add to debugfs */
925 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
926 ieee80211_debugfs_dir);
927
928 cfg80211_debugfs_rdev_add(rdev);
929 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
930
931 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
932 struct regulatory_request request;
933
934 request.wiphy_idx = get_wiphy_idx(wiphy);
935 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
936 request.alpha2[0] = '9';
937 request.alpha2[1] = '9';
938
939 nl80211_send_reg_change_event(&request);
940 }
941
942 /* Check that nobody globally advertises any capabilities they do not
943 * advertise on all possible interface types.
944 */
945 if (wiphy->extended_capabilities_len &&
946 wiphy->num_iftype_ext_capab &&
947 wiphy->iftype_ext_capab) {
948 u8 supported_on_all, j;
949 const struct wiphy_iftype_ext_capab *capab;
950
951 capab = wiphy->iftype_ext_capab;
952 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
953 if (capab[0].extended_capabilities_len > j)
954 supported_on_all =
955 capab[0].extended_capabilities[j];
956 else
957 supported_on_all = 0x00;
958 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
959 if (j >= capab[i].extended_capabilities_len) {
960 supported_on_all = 0x00;
961 break;
962 }
963 supported_on_all &=
964 capab[i].extended_capabilities[j];
965 }
966 if (WARN_ON(wiphy->extended_capabilities[j] &
967 ~supported_on_all))
968 break;
969 }
970 }
971
972 rdev->wiphy.registered = true;
973 rtnl_unlock();
974
975 res = rfkill_register(rdev->rfkill);
976 if (res) {
977 rfkill_destroy(rdev->rfkill);
978 rdev->rfkill = NULL;
979 wiphy_unregister(&rdev->wiphy);
980 return res;
981 }
982
983 return 0;
984}
985EXPORT_SYMBOL(wiphy_register);
986
987void wiphy_rfkill_start_polling(struct wiphy *wiphy)
988{
989 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
990
991 if (!rdev->ops->rfkill_poll)
992 return;
993 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
994 rfkill_resume_polling(rdev->rfkill);
995}
996EXPORT_SYMBOL(wiphy_rfkill_start_polling);
997
998void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
999{
1000 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1001
1002 rfkill_pause_polling(rdev->rfkill);
1003}
1004EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
1005
1006void wiphy_unregister(struct wiphy *wiphy)
1007{
1008 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1009
1010 wait_event(rdev->dev_wait, ({
1011 int __count;
1012 rtnl_lock();
1013 __count = rdev->opencount;
1014 rtnl_unlock();
1015 __count == 0; }));
1016
1017 if (rdev->rfkill)
1018 rfkill_unregister(rdev->rfkill);
1019
1020 rtnl_lock();
1021 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1022 rdev->wiphy.registered = false;
1023
1024 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1025
1026 /*
1027 * First remove the hardware from everywhere, this makes
1028 * it impossible to find from userspace.
1029 */
1030 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1031 list_del_rcu(&rdev->list);
1032 synchronize_rcu();
1033
1034 /*
1035 * If this device got a regulatory hint tell core its
1036 * free to listen now to a new shiny device regulatory hint
1037 */
1038 wiphy_regulatory_deregister(wiphy);
1039
1040 cfg80211_rdev_list_generation++;
1041 device_del(&rdev->wiphy.dev);
1042
1043 rtnl_unlock();
1044
1045 flush_work(&rdev->scan_done_wk);
1046 cancel_work_sync(&rdev->conn_work);
1047 flush_work(&rdev->event_work);
1048 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1049 flush_work(&rdev->destroy_work);
1050 flush_work(&rdev->sched_scan_stop_wk);
1051 flush_work(&rdev->propagate_radar_detect_wk);
1052 flush_work(&rdev->propagate_cac_done_wk);
1053 flush_work(&rdev->mgmt_registrations_update_wk);
1054
1055#ifdef CONFIG_PM
1056 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1057 rdev_set_wakeup(rdev, false);
1058#endif
1059 cfg80211_rdev_free_wowlan(rdev);
1060 cfg80211_rdev_free_coalesce(rdev);
1061}
1062EXPORT_SYMBOL(wiphy_unregister);
1063
1064void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1065{
1066 struct cfg80211_internal_bss *scan, *tmp;
1067 struct cfg80211_beacon_registration *reg, *treg;
1068 rfkill_destroy(rdev->rfkill);
1069 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1070 list_del(®->list);
1071 kfree(reg);
1072 }
1073 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1074 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1075 kfree(rdev);
1076}
1077
1078void wiphy_free(struct wiphy *wiphy)
1079{
1080 put_device(&wiphy->dev);
1081}
1082EXPORT_SYMBOL(wiphy_free);
1083
1084void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1085{
1086 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1087
1088 if (rfkill_set_hw_state(rdev->rfkill, blocked))
1089 schedule_work(&rdev->rfkill_block);
1090}
1091EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1092
1093void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1094{
1095 kfree(wdev->cqm_config);
1096 wdev->cqm_config = NULL;
1097}
1098
1099static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1100{
1101 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1102
1103 ASSERT_RTNL();
1104
1105 flush_work(&wdev->pmsr_free_wk);
1106
1107 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1108
1109 list_del_rcu(&wdev->list);
1110 if (sync)
1111 synchronize_rcu();
1112 rdev->devlist_generation++;
1113
1114 cfg80211_mlme_purge_registrations(wdev);
1115
1116 switch (wdev->iftype) {
1117 case NL80211_IFTYPE_P2P_DEVICE:
1118 cfg80211_stop_p2p_device(rdev, wdev);
1119 break;
1120 case NL80211_IFTYPE_NAN:
1121 cfg80211_stop_nan(rdev, wdev);
1122 break;
1123 default:
1124 break;
1125 }
1126
1127#ifdef CONFIG_CFG80211_WEXT
1128 kfree_sensitive(wdev->wext.keys);
1129 wdev->wext.keys = NULL;
1130#endif
1131 /* only initialized if we have a netdev */
1132 if (wdev->netdev)
1133 flush_work(&wdev->disconnect_wk);
1134
1135 cfg80211_cqm_config_free(wdev);
1136}
1137
1138void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1139{
1140 if (WARN_ON(wdev->netdev))
1141 return;
1142
1143 __cfg80211_unregister_wdev(wdev, true);
1144}
1145EXPORT_SYMBOL(cfg80211_unregister_wdev);
1146
1147static const struct device_type wiphy_type = {
1148 .name = "wlan",
1149};
1150
1151void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1152 enum nl80211_iftype iftype, int num)
1153{
1154 ASSERT_RTNL();
1155
1156 rdev->num_running_ifaces += num;
1157 if (iftype == NL80211_IFTYPE_MONITOR)
1158 rdev->num_running_monitor_ifaces += num;
1159}
1160
1161void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1162 struct wireless_dev *wdev)
1163{
1164 struct net_device *dev = wdev->netdev;
1165 struct cfg80211_sched_scan_request *pos, *tmp;
1166
1167 ASSERT_RTNL();
1168 ASSERT_WDEV_LOCK(wdev);
1169
1170 cfg80211_pmsr_wdev_down(wdev);
1171
1172 switch (wdev->iftype) {
1173 case NL80211_IFTYPE_ADHOC:
1174 __cfg80211_leave_ibss(rdev, dev, true);
1175 break;
1176 case NL80211_IFTYPE_P2P_CLIENT:
1177 case NL80211_IFTYPE_STATION:
1178 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1179 list) {
1180 if (dev == pos->dev)
1181 cfg80211_stop_sched_scan_req(rdev, pos, false);
1182 }
1183
1184#ifdef CONFIG_CFG80211_WEXT
1185 kfree(wdev->wext.ie);
1186 wdev->wext.ie = NULL;
1187 wdev->wext.ie_len = 0;
1188 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1189#endif
1190 cfg80211_disconnect(rdev, dev,
1191 WLAN_REASON_DEAUTH_LEAVING, true);
1192 break;
1193 case NL80211_IFTYPE_MESH_POINT:
1194 __cfg80211_leave_mesh(rdev, dev);
1195 break;
1196 case NL80211_IFTYPE_AP:
1197 case NL80211_IFTYPE_P2P_GO:
1198 __cfg80211_stop_ap(rdev, dev, true);
1199 break;
1200 case NL80211_IFTYPE_OCB:
1201 __cfg80211_leave_ocb(rdev, dev);
1202 break;
1203 case NL80211_IFTYPE_WDS:
1204 /* must be handled by mac80211/driver, has no APIs */
1205 break;
1206 case NL80211_IFTYPE_P2P_DEVICE:
1207 case NL80211_IFTYPE_NAN:
1208 /* cannot happen, has no netdev */
1209 break;
1210 case NL80211_IFTYPE_AP_VLAN:
1211 case NL80211_IFTYPE_MONITOR:
1212 /* nothing to do */
1213 break;
1214 case NL80211_IFTYPE_UNSPECIFIED:
1215 case NUM_NL80211_IFTYPES:
1216 /* invalid */
1217 break;
1218 }
1219}
1220
1221void cfg80211_leave(struct cfg80211_registered_device *rdev,
1222 struct wireless_dev *wdev)
1223{
1224 wdev_lock(wdev);
1225 __cfg80211_leave(rdev, wdev);
1226 wdev_unlock(wdev);
1227}
1228
1229void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1230 gfp_t gfp)
1231{
1232 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1233 struct cfg80211_event *ev;
1234 unsigned long flags;
1235
1236 trace_cfg80211_stop_iface(wiphy, wdev);
1237
1238 ev = kzalloc(sizeof(*ev), gfp);
1239 if (!ev)
1240 return;
1241
1242 ev->type = EVENT_STOPPED;
1243
1244 spin_lock_irqsave(&wdev->event_lock, flags);
1245 list_add_tail(&ev->list, &wdev->event_list);
1246 spin_unlock_irqrestore(&wdev->event_lock, flags);
1247 queue_work(cfg80211_wq, &rdev->event_work);
1248}
1249EXPORT_SYMBOL(cfg80211_stop_iface);
1250
1251void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
1252 struct wireless_dev *wdev)
1253{
1254 mutex_init(&wdev->mtx);
1255 INIT_LIST_HEAD(&wdev->event_list);
1256 spin_lock_init(&wdev->event_lock);
1257 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1258 spin_lock_init(&wdev->mgmt_registrations_lock);
1259 INIT_LIST_HEAD(&wdev->pmsr_list);
1260 spin_lock_init(&wdev->pmsr_lock);
1261 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1262
1263 /*
1264 * We get here also when the interface changes network namespaces,
1265 * as it's registered into the new one, but we don't want it to
1266 * change ID in that case. Checking if the ID is already assigned
1267 * works, because 0 isn't considered a valid ID and the memory is
1268 * 0-initialized.
1269 */
1270 if (!wdev->identifier)
1271 wdev->identifier = ++rdev->wdev_id;
1272 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1273 rdev->devlist_generation++;
1274
1275 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1276}
1277
1278static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1279 unsigned long state, void *ptr)
1280{
1281 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1282 struct wireless_dev *wdev = dev->ieee80211_ptr;
1283 struct cfg80211_registered_device *rdev;
1284 struct cfg80211_sched_scan_request *pos, *tmp;
1285
1286 if (!wdev)
1287 return NOTIFY_DONE;
1288
1289 rdev = wiphy_to_rdev(wdev->wiphy);
1290
1291 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1292
1293 switch (state) {
1294 case NETDEV_POST_INIT:
1295 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1296 break;
1297 case NETDEV_REGISTER:
1298 /*
1299 * NB: cannot take rdev->mtx here because this may be
1300 * called within code protected by it when interfaces
1301 * are added with nl80211.
1302 */
1303 /* can only change netns with wiphy */
1304 dev->features |= NETIF_F_NETNS_LOCAL;
1305
1306 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1307 "phy80211")) {
1308 pr_err("failed to add phy80211 symlink to netdev!\n");
1309 }
1310 wdev->netdev = dev;
1311#ifdef CONFIG_CFG80211_WEXT
1312 wdev->wext.default_key = -1;
1313 wdev->wext.default_mgmt_key = -1;
1314 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1315#endif
1316
1317 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1318 wdev->ps = true;
1319 else
1320 wdev->ps = false;
1321 /* allow mac80211 to determine the timeout */
1322 wdev->ps_timeout = -1;
1323
1324 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1325 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1326 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1327 dev->priv_flags |= IFF_DONT_BRIDGE;
1328
1329 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1330
1331 cfg80211_init_wdev(rdev, wdev);
1332 break;
1333 case NETDEV_GOING_DOWN:
1334 cfg80211_leave(rdev, wdev);
1335 break;
1336 case NETDEV_DOWN:
1337 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1338 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1339 if (WARN_ON(!rdev->scan_req->notified))
1340 rdev->scan_req->info.aborted = true;
1341 ___cfg80211_scan_done(rdev, false);
1342 }
1343
1344 list_for_each_entry_safe(pos, tmp,
1345 &rdev->sched_scan_req_list, list) {
1346 if (WARN_ON(pos->dev == wdev->netdev))
1347 cfg80211_stop_sched_scan_req(rdev, pos, false);
1348 }
1349
1350 rdev->opencount--;
1351 wake_up(&rdev->dev_wait);
1352 break;
1353 case NETDEV_UP:
1354 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1355 wdev_lock(wdev);
1356 switch (wdev->iftype) {
1357#ifdef CONFIG_CFG80211_WEXT
1358 case NL80211_IFTYPE_ADHOC:
1359 cfg80211_ibss_wext_join(rdev, wdev);
1360 break;
1361 case NL80211_IFTYPE_STATION:
1362 cfg80211_mgd_wext_connect(rdev, wdev);
1363 break;
1364#endif
1365#ifdef CONFIG_MAC80211_MESH
1366 case NL80211_IFTYPE_MESH_POINT:
1367 {
1368 /* backward compat code... */
1369 struct mesh_setup setup;
1370 memcpy(&setup, &default_mesh_setup,
1371 sizeof(setup));
1372 /* back compat only needed for mesh_id */
1373 setup.mesh_id = wdev->ssid;
1374 setup.mesh_id_len = wdev->mesh_id_up_len;
1375 if (wdev->mesh_id_up_len)
1376 __cfg80211_join_mesh(rdev, dev,
1377 &setup,
1378 &default_mesh_config);
1379 break;
1380 }
1381#endif
1382 default:
1383 break;
1384 }
1385 wdev_unlock(wdev);
1386 rdev->opencount++;
1387
1388 /*
1389 * Configure power management to the driver here so that its
1390 * correctly set also after interface type changes etc.
1391 */
1392 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1393 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1394 rdev->ops->set_power_mgmt &&
1395 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1396 wdev->ps_timeout)) {
1397 /* assume this means it's off */
1398 wdev->ps = false;
1399 }
1400 break;
1401 case NETDEV_UNREGISTER:
1402 /*
1403 * It is possible to get NETDEV_UNREGISTER
1404 * multiple times. To detect that, check
1405 * that the interface is still on the list
1406 * of registered interfaces, and only then
1407 * remove and clean it up.
1408 */
1409 if (!list_empty(&wdev->list)) {
1410 __cfg80211_unregister_wdev(wdev, false);
1411 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1412 }
1413 /*
1414 * synchronise (so that we won't find this netdev
1415 * from other code any more) and then clear the list
1416 * head so that the above code can safely check for
1417 * !list_empty() to avoid double-cleanup.
1418 */
1419 synchronize_rcu();
1420 INIT_LIST_HEAD(&wdev->list);
1421 /*
1422 * Ensure that all events have been processed and
1423 * freed.
1424 */
1425 cfg80211_process_wdev_events(wdev);
1426
1427 if (WARN_ON(wdev->current_bss)) {
1428 cfg80211_unhold_bss(wdev->current_bss);
1429 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1430 wdev->current_bss = NULL;
1431 }
1432 break;
1433 case NETDEV_PRE_UP:
1434 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1435 wdev->use_4addr, 0))
1436 return notifier_from_errno(-EOPNOTSUPP);
1437
1438 if (rfkill_blocked(rdev->rfkill))
1439 return notifier_from_errno(-ERFKILL);
1440 break;
1441 default:
1442 return NOTIFY_DONE;
1443 }
1444
1445 wireless_nlevent_flush();
1446
1447 return NOTIFY_OK;
1448}
1449
1450static struct notifier_block cfg80211_netdev_notifier = {
1451 .notifier_call = cfg80211_netdev_notifier_call,
1452};
1453
1454static void __net_exit cfg80211_pernet_exit(struct net *net)
1455{
1456 struct cfg80211_registered_device *rdev;
1457
1458 rtnl_lock();
1459 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1460 if (net_eq(wiphy_net(&rdev->wiphy), net))
1461 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1462 }
1463 rtnl_unlock();
1464}
1465
1466static struct pernet_operations cfg80211_pernet_ops = {
1467 .exit = cfg80211_pernet_exit,
1468};
1469
1470static int __init cfg80211_init(void)
1471{
1472 int err;
1473
1474 err = register_pernet_device(&cfg80211_pernet_ops);
1475 if (err)
1476 goto out_fail_pernet;
1477
1478 err = wiphy_sysfs_init();
1479 if (err)
1480 goto out_fail_sysfs;
1481
1482 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1483 if (err)
1484 goto out_fail_notifier;
1485
1486 err = nl80211_init();
1487 if (err)
1488 goto out_fail_nl80211;
1489
1490 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1491
1492 err = regulatory_init();
1493 if (err)
1494 goto out_fail_reg;
1495
1496 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1497 if (!cfg80211_wq) {
1498 err = -ENOMEM;
1499 goto out_fail_wq;
1500 }
1501
1502 return 0;
1503
1504out_fail_wq:
1505 regulatory_exit();
1506out_fail_reg:
1507 debugfs_remove(ieee80211_debugfs_dir);
1508 nl80211_exit();
1509out_fail_nl80211:
1510 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1511out_fail_notifier:
1512 wiphy_sysfs_exit();
1513out_fail_sysfs:
1514 unregister_pernet_device(&cfg80211_pernet_ops);
1515out_fail_pernet:
1516 return err;
1517}
1518fs_initcall(cfg80211_init);
1519
1520static void __exit cfg80211_exit(void)
1521{
1522 debugfs_remove(ieee80211_debugfs_dir);
1523 nl80211_exit();
1524 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1525 wiphy_sysfs_exit();
1526 regulatory_exit();
1527 unregister_pernet_device(&cfg80211_pernet_ops);
1528 destroy_workqueue(cfg80211_wq);
1529}
1530module_exit(cfg80211_exit);