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) 2018-2021 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
37 MODULE_AUTHOR("Johannes Berg");
38 MODULE_LICENSE("GPL");
39 MODULE_DESCRIPTION("wireless configuration support");
40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
41
42 /* RCU-protected (and RTNL for writers) */
43 LIST_HEAD(cfg80211_rdev_list);
44 int cfg80211_rdev_list_generation;
45
46 /* for debugfs */
47 static struct dentry *ieee80211_debugfs_dir;
48
49 /* for the cleanup, scan and event works */
50 struct workqueue_struct *cfg80211_wq;
51
52 static bool cfg80211_disable_40mhz_24ghz;
53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
55 "Disable 40MHz support in the 2.4GHz band");
56
cfg80211_rdev_by_wiphy_idx(int wiphy_idx)57 struct 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
get_wiphy_idx(struct wiphy * wiphy)73 int 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
wiphy_idx_to_wiphy(int wiphy_idx)80 struct 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
cfg80211_dev_check_name(struct cfg80211_registered_device * rdev,const char * newname)92 static 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
cfg80211_dev_rename(struct cfg80211_registered_device * rdev,char * newname)126 int 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
cfg80211_switch_netns(struct cfg80211_registered_device * rdev,struct net * net)155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
156 struct net *net)
157 {
158 struct wireless_dev *wdev;
159 int err = 0;
160
161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
162 return -EOPNOTSUPP;
163
164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
165 if (!wdev->netdev)
166 continue;
167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
169 if (err)
170 break;
171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
172 }
173
174 if (err) {
175 /* failed -- clean up to old netns */
176 net = wiphy_net(&rdev->wiphy);
177
178 list_for_each_entry_continue_reverse(wdev,
179 &rdev->wiphy.wdev_list,
180 list) {
181 if (!wdev->netdev)
182 continue;
183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
184 err = dev_change_net_namespace(wdev->netdev, net,
185 "wlan%d");
186 WARN_ON(err);
187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
188 }
189
190 return err;
191 }
192
193 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
cfg80211_rfkill_poll(struct rfkill * rfkill,void * data)215 static 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
cfg80211_stop_p2p_device(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)222 void 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
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)245 void 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
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)262 void 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 }
287 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
288
cfg80211_rfkill_set_block(void * data,bool blocked)289 static 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
cfg80211_rfkill_block_work(struct work_struct * work)303 static 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
cfg80211_event_work(struct work_struct * work)312 static 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
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)324 void 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
cfg80211_destroy_iface_wk(struct work_struct * work)336 static 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
cfg80211_sched_scan_stop_wk(struct work_struct * work)348 static 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
cfg80211_propagate_radar_detect_wk(struct work_struct * work)364 static 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
cfg80211_propagate_cac_done_wk(struct work_struct * work)380 static 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
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)398 struct 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
462 use_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_LIST_HEAD(&rdev->mlme_unreg);
484 spin_lock_init(&rdev->mlme_unreg_lock);
485 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
486 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
487 cfg80211_dfs_channels_update_work);
488 #ifdef CONFIG_CFG80211_WEXT
489 rdev->wiphy.wext = &cfg80211_wext_handler;
490 #endif
491
492 device_initialize(&rdev->wiphy.dev);
493 rdev->wiphy.dev.class = &ieee80211_class;
494 rdev->wiphy.dev.platform_data = rdev;
495 device_enable_async_suspend(&rdev->wiphy.dev);
496
497 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
498 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
499 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
500 INIT_WORK(&rdev->propagate_radar_detect_wk,
501 cfg80211_propagate_radar_detect_wk);
502 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
503
504 #ifdef CONFIG_CFG80211_DEFAULT_PS
505 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
506 #endif
507
508 wiphy_net_set(&rdev->wiphy, &init_net);
509
510 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
511 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
512 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
513 &rdev->rfkill_ops, rdev);
514
515 if (!rdev->rfkill) {
516 wiphy_free(&rdev->wiphy);
517 return NULL;
518 }
519
520 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
521 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
522 INIT_WORK(&rdev->event_work, cfg80211_event_work);
523
524 init_waitqueue_head(&rdev->dev_wait);
525
526 /*
527 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
528 * Fragmentation and RTS threshold are disabled by default with the
529 * special -1 value.
530 */
531 rdev->wiphy.retry_short = 7;
532 rdev->wiphy.retry_long = 4;
533 rdev->wiphy.frag_threshold = (u32) -1;
534 rdev->wiphy.rts_threshold = (u32) -1;
535 rdev->wiphy.coverage_class = 0;
536
537 rdev->wiphy.max_num_csa_counters = 1;
538
539 rdev->wiphy.max_sched_scan_plans = 1;
540 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
541
542 return &rdev->wiphy;
543 }
544 EXPORT_SYMBOL(wiphy_new_nm);
545
wiphy_verify_combinations(struct wiphy * wiphy)546 static int wiphy_verify_combinations(struct wiphy *wiphy)
547 {
548 const struct ieee80211_iface_combination *c;
549 int i, j;
550
551 for (i = 0; i < wiphy->n_iface_combinations; i++) {
552 u32 cnt = 0;
553 u16 all_iftypes = 0;
554
555 c = &wiphy->iface_combinations[i];
556
557 /*
558 * Combinations with just one interface aren't real,
559 * however we make an exception for DFS.
560 */
561 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
562 return -EINVAL;
563
564 /* Need at least one channel */
565 if (WARN_ON(!c->num_different_channels))
566 return -EINVAL;
567
568 /*
569 * Put a sane limit on maximum number of different
570 * channels to simplify channel accounting code.
571 */
572 if (WARN_ON(c->num_different_channels >
573 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
574 return -EINVAL;
575
576 /* DFS only works on one channel. */
577 if (WARN_ON(c->radar_detect_widths &&
578 (c->num_different_channels > 1)))
579 return -EINVAL;
580
581 if (WARN_ON(!c->n_limits))
582 return -EINVAL;
583
584 for (j = 0; j < c->n_limits; j++) {
585 u16 types = c->limits[j].types;
586
587 /* interface types shouldn't overlap */
588 if (WARN_ON(types & all_iftypes))
589 return -EINVAL;
590 all_iftypes |= types;
591
592 if (WARN_ON(!c->limits[j].max))
593 return -EINVAL;
594
595 /* Shouldn't list software iftypes in combinations! */
596 if (WARN_ON(wiphy->software_iftypes & types))
597 return -EINVAL;
598
599 /* Only a single P2P_DEVICE can be allowed */
600 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
601 c->limits[j].max > 1))
602 return -EINVAL;
603
604 /* Only a single NAN can be allowed */
605 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
606 c->limits[j].max > 1))
607 return -EINVAL;
608
609 /*
610 * This isn't well-defined right now. If you have an
611 * IBSS interface, then its beacon interval may change
612 * by joining other networks, and nothing prevents it
613 * from doing that.
614 * So technically we probably shouldn't even allow AP
615 * and IBSS in the same interface, but it seems that
616 * some drivers support that, possibly only with fixed
617 * beacon intervals for IBSS.
618 */
619 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
620 c->beacon_int_min_gcd)) {
621 return -EINVAL;
622 }
623
624 cnt += c->limits[j].max;
625 /*
626 * Don't advertise an unsupported type
627 * in a combination.
628 */
629 if (WARN_ON((wiphy->interface_modes & types) != types))
630 return -EINVAL;
631 }
632
633 #ifndef CONFIG_WIRELESS_WDS
634 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
635 return -EINVAL;
636 #endif
637
638 /* You can't even choose that many! */
639 if (WARN_ON(cnt < c->max_interfaces))
640 return -EINVAL;
641 }
642
643 return 0;
644 }
645
wiphy_register(struct wiphy * wiphy)646 int wiphy_register(struct wiphy *wiphy)
647 {
648 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
649 int res;
650 enum nl80211_band band;
651 struct ieee80211_supported_band *sband;
652 bool have_band = false;
653 int i;
654 u16 ifmodes = wiphy->interface_modes;
655
656 #ifdef CONFIG_PM
657 if (WARN_ON(wiphy->wowlan &&
658 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
659 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
660 return -EINVAL;
661 if (WARN_ON(wiphy->wowlan &&
662 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
663 !wiphy->wowlan->tcp))
664 return -EINVAL;
665 #endif
666 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
667 (!rdev->ops->tdls_channel_switch ||
668 !rdev->ops->tdls_cancel_channel_switch)))
669 return -EINVAL;
670
671 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
672 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
673 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
674 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
675 return -EINVAL;
676
677 #ifndef CONFIG_WIRELESS_WDS
678 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
679 return -EINVAL;
680 #endif
681
682 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
683 return -EINVAL;
684
685 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
686 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
687 !wiphy->pmsr_capa->ftm.non_asap))
688 return -EINVAL;
689 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
690 !wiphy->pmsr_capa->ftm.bandwidths))
691 return -EINVAL;
692 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
693 ~(BIT(NL80211_PREAMBLE_LEGACY) |
694 BIT(NL80211_PREAMBLE_HT) |
695 BIT(NL80211_PREAMBLE_VHT) |
696 BIT(NL80211_PREAMBLE_DMG))))
697 return -EINVAL;
698 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
699 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
700 BIT(NL80211_CHAN_WIDTH_20) |
701 BIT(NL80211_CHAN_WIDTH_40) |
702 BIT(NL80211_CHAN_WIDTH_80) |
703 BIT(NL80211_CHAN_WIDTH_80P80) |
704 BIT(NL80211_CHAN_WIDTH_160) |
705 BIT(NL80211_CHAN_WIDTH_5) |
706 BIT(NL80211_CHAN_WIDTH_10))))
707 return -EINVAL;
708 }
709
710 /*
711 * if a wiphy has unsupported modes for regulatory channel enforcement,
712 * opt-out of enforcement checking
713 */
714 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
715 BIT(NL80211_IFTYPE_P2P_CLIENT) |
716 BIT(NL80211_IFTYPE_AP) |
717 BIT(NL80211_IFTYPE_P2P_GO) |
718 BIT(NL80211_IFTYPE_ADHOC) |
719 BIT(NL80211_IFTYPE_P2P_DEVICE) |
720 BIT(NL80211_IFTYPE_NAN) |
721 BIT(NL80211_IFTYPE_AP_VLAN) |
722 BIT(NL80211_IFTYPE_MONITOR)))
723 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
724
725 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
726 (wiphy->regulatory_flags &
727 (REGULATORY_CUSTOM_REG |
728 REGULATORY_STRICT_REG |
729 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
730 REGULATORY_COUNTRY_IE_IGNORE))))
731 return -EINVAL;
732
733 if (WARN_ON(wiphy->coalesce &&
734 (!wiphy->coalesce->n_rules ||
735 !wiphy->coalesce->n_patterns) &&
736 (!wiphy->coalesce->pattern_min_len ||
737 wiphy->coalesce->pattern_min_len >
738 wiphy->coalesce->pattern_max_len)))
739 return -EINVAL;
740
741 if (WARN_ON(wiphy->ap_sme_capa &&
742 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
743 return -EINVAL;
744
745 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
746 return -EINVAL;
747
748 if (WARN_ON(wiphy->addresses &&
749 !is_zero_ether_addr(wiphy->perm_addr) &&
750 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
751 ETH_ALEN)))
752 return -EINVAL;
753
754 if (WARN_ON(wiphy->max_acl_mac_addrs &&
755 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
756 !rdev->ops->set_mac_acl)))
757 return -EINVAL;
758
759 /* assure only valid behaviours are flagged by driver
760 * hence subtract 2 as bit 0 is invalid.
761 */
762 if (WARN_ON(wiphy->bss_select_support &&
763 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
764 return -EINVAL;
765
766 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
767 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
768 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
769 return -EINVAL;
770
771 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
772 rdev->ops->update_connect_params))
773 return -EINVAL;
774
775 if (wiphy->addresses)
776 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
777
778 /* sanity check ifmodes */
779 WARN_ON(!ifmodes);
780 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
781 if (WARN_ON(ifmodes != wiphy->interface_modes))
782 wiphy->interface_modes = ifmodes;
783
784 res = wiphy_verify_combinations(wiphy);
785 if (res)
786 return res;
787
788 /* sanity check supported bands/channels */
789 for (band = 0; band < NUM_NL80211_BANDS; band++) {
790 u16 types = 0;
791 bool have_he = false;
792
793 sband = wiphy->bands[band];
794 if (!sband)
795 continue;
796
797 sband->band = band;
798 if (WARN_ON(!sband->n_channels))
799 return -EINVAL;
800 /*
801 * on 60GHz band, there are no legacy rates, so
802 * n_bitrates is 0
803 */
804 if (WARN_ON(band != NL80211_BAND_60GHZ &&
805 !sband->n_bitrates))
806 return -EINVAL;
807
808 if (WARN_ON(band == NL80211_BAND_6GHZ &&
809 (sband->ht_cap.ht_supported ||
810 sband->vht_cap.vht_supported)))
811 return -EINVAL;
812
813 /*
814 * Since cfg80211_disable_40mhz_24ghz is global, we can
815 * modify the sband's ht data even if the driver uses a
816 * global structure for that.
817 */
818 if (cfg80211_disable_40mhz_24ghz &&
819 band == NL80211_BAND_2GHZ &&
820 sband->ht_cap.ht_supported) {
821 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
822 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
823 }
824
825 /*
826 * Since we use a u32 for rate bitmaps in
827 * ieee80211_get_response_rate, we cannot
828 * have more than 32 legacy rates.
829 */
830 if (WARN_ON(sband->n_bitrates > 32))
831 return -EINVAL;
832
833 for (i = 0; i < sband->n_channels; i++) {
834 sband->channels[i].orig_flags =
835 sband->channels[i].flags;
836 sband->channels[i].orig_mag = INT_MAX;
837 sband->channels[i].orig_mpwr =
838 sband->channels[i].max_power;
839 sband->channels[i].band = band;
840 }
841
842 for (i = 0; i < sband->n_iftype_data; i++) {
843 const struct ieee80211_sband_iftype_data *iftd;
844
845 iftd = &sband->iftype_data[i];
846
847 if (WARN_ON(!iftd->types_mask))
848 return -EINVAL;
849 if (WARN_ON(types & iftd->types_mask))
850 return -EINVAL;
851
852 /* at least one piece of information must be present */
853 if (WARN_ON(!iftd->he_cap.has_he))
854 return -EINVAL;
855
856 types |= iftd->types_mask;
857
858 if (i == 0)
859 have_he = iftd->he_cap.has_he;
860 else
861 have_he = have_he &&
862 iftd->he_cap.has_he;
863 }
864
865 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
866 return -EINVAL;
867
868 have_band = true;
869 }
870
871 if (!have_band) {
872 WARN_ON(1);
873 return -EINVAL;
874 }
875
876 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
877 /*
878 * Validate we have a policy (can be explicitly set to
879 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
880 * we have at least one of doit/dumpit.
881 */
882 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
883 return -EINVAL;
884 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
885 !rdev->wiphy.vendor_commands[i].dumpit))
886 return -EINVAL;
887 }
888
889 #ifdef CONFIG_PM
890 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
891 (!rdev->wiphy.wowlan->pattern_min_len ||
892 rdev->wiphy.wowlan->pattern_min_len >
893 rdev->wiphy.wowlan->pattern_max_len)))
894 return -EINVAL;
895 #endif
896
897 /* check and set up bitrates */
898 ieee80211_set_bitrate_flags(wiphy);
899
900 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
901
902 rtnl_lock();
903 res = device_add(&rdev->wiphy.dev);
904 if (res) {
905 rtnl_unlock();
906 return res;
907 }
908
909 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
910 cfg80211_rdev_list_generation++;
911
912 /* add to debugfs */
913 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
914 ieee80211_debugfs_dir);
915
916 cfg80211_debugfs_rdev_add(rdev);
917 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
918
919 /* set up regulatory info */
920 wiphy_regulatory_register(wiphy);
921
922 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
923 struct regulatory_request request;
924
925 request.wiphy_idx = get_wiphy_idx(wiphy);
926 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
927 request.alpha2[0] = '9';
928 request.alpha2[1] = '9';
929
930 nl80211_send_reg_change_event(&request);
931 }
932
933 /* Check that nobody globally advertises any capabilities they do not
934 * advertise on all possible interface types.
935 */
936 if (wiphy->extended_capabilities_len &&
937 wiphy->num_iftype_ext_capab &&
938 wiphy->iftype_ext_capab) {
939 u8 supported_on_all, j;
940 const struct wiphy_iftype_ext_capab *capab;
941
942 capab = wiphy->iftype_ext_capab;
943 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
944 if (capab[0].extended_capabilities_len > j)
945 supported_on_all =
946 capab[0].extended_capabilities[j];
947 else
948 supported_on_all = 0x00;
949 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
950 if (j >= capab[i].extended_capabilities_len) {
951 supported_on_all = 0x00;
952 break;
953 }
954 supported_on_all &=
955 capab[i].extended_capabilities[j];
956 }
957 if (WARN_ON(wiphy->extended_capabilities[j] &
958 ~supported_on_all))
959 break;
960 }
961 }
962
963 rdev->wiphy.registered = true;
964 rtnl_unlock();
965
966 res = rfkill_register(rdev->rfkill);
967 if (res) {
968 rfkill_destroy(rdev->rfkill);
969 rdev->rfkill = NULL;
970 wiphy_unregister(&rdev->wiphy);
971 return res;
972 }
973
974 return 0;
975 }
976 EXPORT_SYMBOL(wiphy_register);
977
wiphy_rfkill_start_polling(struct wiphy * wiphy)978 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
979 {
980 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
981
982 if (!rdev->ops->rfkill_poll)
983 return;
984 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
985 rfkill_resume_polling(rdev->rfkill);
986 }
987 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
988
wiphy_rfkill_stop_polling(struct wiphy * wiphy)989 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
990 {
991 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
992
993 rfkill_pause_polling(rdev->rfkill);
994 }
995 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
996
wiphy_unregister(struct wiphy * wiphy)997 void wiphy_unregister(struct wiphy *wiphy)
998 {
999 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1000
1001 wait_event(rdev->dev_wait, ({
1002 int __count;
1003 rtnl_lock();
1004 __count = rdev->opencount;
1005 rtnl_unlock();
1006 __count == 0; }));
1007
1008 if (rdev->rfkill)
1009 rfkill_unregister(rdev->rfkill);
1010
1011 rtnl_lock();
1012 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1013 rdev->wiphy.registered = false;
1014
1015 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1016
1017 /*
1018 * First remove the hardware from everywhere, this makes
1019 * it impossible to find from userspace.
1020 */
1021 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1022 list_del_rcu(&rdev->list);
1023 synchronize_rcu();
1024
1025 /*
1026 * If this device got a regulatory hint tell core its
1027 * free to listen now to a new shiny device regulatory hint
1028 */
1029 wiphy_regulatory_deregister(wiphy);
1030
1031 cfg80211_rdev_list_generation++;
1032 device_del(&rdev->wiphy.dev);
1033
1034 rtnl_unlock();
1035
1036 flush_work(&rdev->scan_done_wk);
1037 cancel_work_sync(&rdev->conn_work);
1038 flush_work(&rdev->event_work);
1039 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1040 flush_work(&rdev->destroy_work);
1041 flush_work(&rdev->sched_scan_stop_wk);
1042 flush_work(&rdev->mlme_unreg_wk);
1043 flush_work(&rdev->propagate_radar_detect_wk);
1044 flush_work(&rdev->propagate_cac_done_wk);
1045
1046 #ifdef CONFIG_PM
1047 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1048 rdev_set_wakeup(rdev, false);
1049 #endif
1050 cfg80211_rdev_free_wowlan(rdev);
1051 cfg80211_rdev_free_coalesce(rdev);
1052 }
1053 EXPORT_SYMBOL(wiphy_unregister);
1054
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1055 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1056 {
1057 struct cfg80211_internal_bss *scan, *tmp;
1058 struct cfg80211_beacon_registration *reg, *treg;
1059 rfkill_destroy(rdev->rfkill);
1060 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1061 list_del(®->list);
1062 kfree(reg);
1063 }
1064 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1065 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1066 kfree(rdev);
1067 }
1068
wiphy_free(struct wiphy * wiphy)1069 void wiphy_free(struct wiphy *wiphy)
1070 {
1071 put_device(&wiphy->dev);
1072 }
1073 EXPORT_SYMBOL(wiphy_free);
1074
wiphy_rfkill_set_hw_state(struct wiphy * wiphy,bool blocked)1075 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1076 {
1077 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1078
1079 if (rfkill_set_hw_state(rdev->rfkill, blocked))
1080 schedule_work(&rdev->rfkill_block);
1081 }
1082 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1083
cfg80211_cqm_config_free(struct wireless_dev * wdev)1084 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1085 {
1086 kfree(wdev->cqm_config);
1087 wdev->cqm_config = NULL;
1088 }
1089
__cfg80211_unregister_wdev(struct wireless_dev * wdev,bool sync)1090 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1091 {
1092 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1093
1094 ASSERT_RTNL();
1095
1096 flush_work(&wdev->pmsr_free_wk);
1097
1098 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1099
1100 list_del_rcu(&wdev->list);
1101 if (sync)
1102 synchronize_rcu();
1103 rdev->devlist_generation++;
1104
1105 cfg80211_mlme_purge_registrations(wdev);
1106
1107 switch (wdev->iftype) {
1108 case NL80211_IFTYPE_P2P_DEVICE:
1109 cfg80211_stop_p2p_device(rdev, wdev);
1110 break;
1111 case NL80211_IFTYPE_NAN:
1112 cfg80211_stop_nan(rdev, wdev);
1113 break;
1114 default:
1115 break;
1116 }
1117
1118 #ifdef CONFIG_CFG80211_WEXT
1119 kzfree(wdev->wext.keys);
1120 wdev->wext.keys = NULL;
1121 #endif
1122 /* only initialized if we have a netdev */
1123 if (wdev->netdev)
1124 flush_work(&wdev->disconnect_wk);
1125
1126 cfg80211_cqm_config_free(wdev);
1127 }
1128
cfg80211_unregister_wdev(struct wireless_dev * wdev)1129 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1130 {
1131 if (WARN_ON(wdev->netdev))
1132 return;
1133
1134 __cfg80211_unregister_wdev(wdev, true);
1135 }
1136 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1137
1138 static const struct device_type wiphy_type = {
1139 .name = "wlan",
1140 };
1141
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1142 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1143 enum nl80211_iftype iftype, int num)
1144 {
1145 ASSERT_RTNL();
1146
1147 rdev->num_running_ifaces += num;
1148 if (iftype == NL80211_IFTYPE_MONITOR)
1149 rdev->num_running_monitor_ifaces += num;
1150 }
1151
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1152 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1153 struct wireless_dev *wdev)
1154 {
1155 struct net_device *dev = wdev->netdev;
1156 struct cfg80211_sched_scan_request *pos, *tmp;
1157
1158 ASSERT_RTNL();
1159 ASSERT_WDEV_LOCK(wdev);
1160
1161 cfg80211_pmsr_wdev_down(wdev);
1162
1163 switch (wdev->iftype) {
1164 case NL80211_IFTYPE_ADHOC:
1165 __cfg80211_leave_ibss(rdev, dev, true);
1166 break;
1167 case NL80211_IFTYPE_P2P_CLIENT:
1168 case NL80211_IFTYPE_STATION:
1169 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1170 list) {
1171 if (dev == pos->dev)
1172 cfg80211_stop_sched_scan_req(rdev, pos, false);
1173 }
1174
1175 #ifdef CONFIG_CFG80211_WEXT
1176 kfree(wdev->wext.ie);
1177 wdev->wext.ie = NULL;
1178 wdev->wext.ie_len = 0;
1179 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1180 #endif
1181 cfg80211_disconnect(rdev, dev,
1182 WLAN_REASON_DEAUTH_LEAVING, true);
1183 break;
1184 case NL80211_IFTYPE_MESH_POINT:
1185 __cfg80211_leave_mesh(rdev, dev);
1186 break;
1187 case NL80211_IFTYPE_AP:
1188 case NL80211_IFTYPE_P2P_GO:
1189 __cfg80211_stop_ap(rdev, dev, true);
1190 break;
1191 case NL80211_IFTYPE_OCB:
1192 __cfg80211_leave_ocb(rdev, dev);
1193 break;
1194 case NL80211_IFTYPE_WDS:
1195 /* must be handled by mac80211/driver, has no APIs */
1196 break;
1197 case NL80211_IFTYPE_P2P_DEVICE:
1198 case NL80211_IFTYPE_NAN:
1199 /* cannot happen, has no netdev */
1200 break;
1201 case NL80211_IFTYPE_AP_VLAN:
1202 case NL80211_IFTYPE_MONITOR:
1203 /* nothing to do */
1204 break;
1205 case NL80211_IFTYPE_UNSPECIFIED:
1206 case NUM_NL80211_IFTYPES:
1207 /* invalid */
1208 break;
1209 }
1210 }
1211
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1212 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1213 struct wireless_dev *wdev)
1214 {
1215 wdev_lock(wdev);
1216 __cfg80211_leave(rdev, wdev);
1217 wdev_unlock(wdev);
1218 }
1219
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1220 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1221 gfp_t gfp)
1222 {
1223 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1224 struct cfg80211_event *ev;
1225 unsigned long flags;
1226
1227 trace_cfg80211_stop_iface(wiphy, wdev);
1228
1229 ev = kzalloc(sizeof(*ev), gfp);
1230 if (!ev)
1231 return;
1232
1233 ev->type = EVENT_STOPPED;
1234
1235 spin_lock_irqsave(&wdev->event_lock, flags);
1236 list_add_tail(&ev->list, &wdev->event_list);
1237 spin_unlock_irqrestore(&wdev->event_lock, flags);
1238 queue_work(cfg80211_wq, &rdev->event_work);
1239 }
1240 EXPORT_SYMBOL(cfg80211_stop_iface);
1241
cfg80211_init_wdev(struct wireless_dev * wdev)1242 void cfg80211_init_wdev(struct wireless_dev *wdev)
1243 {
1244 mutex_init(&wdev->mtx);
1245 INIT_LIST_HEAD(&wdev->event_list);
1246 spin_lock_init(&wdev->event_lock);
1247 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1248 spin_lock_init(&wdev->mgmt_registrations_lock);
1249 INIT_LIST_HEAD(&wdev->pmsr_list);
1250 spin_lock_init(&wdev->pmsr_lock);
1251 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1252
1253 #ifdef CONFIG_CFG80211_WEXT
1254 wdev->wext.default_key = -1;
1255 wdev->wext.default_mgmt_key = -1;
1256 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1257 #endif
1258
1259 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1260 wdev->ps = true;
1261 else
1262 wdev->ps = false;
1263 /* allow mac80211 to determine the timeout */
1264 wdev->ps_timeout = -1;
1265
1266 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1267 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1268 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1269 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1270
1271 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1272 }
1273
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1274 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1275 struct wireless_dev *wdev)
1276 {
1277 /*
1278 * We get here also when the interface changes network namespaces,
1279 * as it's registered into the new one, but we don't want it to
1280 * change ID in that case. Checking if the ID is already assigned
1281 * works, because 0 isn't considered a valid ID and the memory is
1282 * 0-initialized.
1283 */
1284 if (!wdev->identifier)
1285 wdev->identifier = ++rdev->wdev_id;
1286 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1287 rdev->devlist_generation++;
1288
1289 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1290 }
1291
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1292 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1293 unsigned long state, void *ptr)
1294 {
1295 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1296 struct wireless_dev *wdev = dev->ieee80211_ptr;
1297 struct cfg80211_registered_device *rdev;
1298 struct cfg80211_sched_scan_request *pos, *tmp;
1299
1300 if (!wdev)
1301 return NOTIFY_DONE;
1302
1303 rdev = wiphy_to_rdev(wdev->wiphy);
1304
1305 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1306
1307 switch (state) {
1308 case NETDEV_POST_INIT:
1309 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1310 wdev->netdev = dev;
1311 /* can only change netns with wiphy */
1312 dev->features |= NETIF_F_NETNS_LOCAL;
1313
1314 cfg80211_init_wdev(wdev);
1315 break;
1316 case NETDEV_REGISTER:
1317 /*
1318 * NB: cannot take rdev->mtx here because this may be
1319 * called within code protected by it when interfaces
1320 * are added with nl80211.
1321 */
1322 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1323 "phy80211")) {
1324 pr_err("failed to add phy80211 symlink to netdev!\n");
1325 }
1326
1327 cfg80211_register_wdev(rdev, wdev);
1328 break;
1329 case NETDEV_GOING_DOWN:
1330 cfg80211_leave(rdev, wdev);
1331 break;
1332 case NETDEV_DOWN:
1333 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1334 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1335 if (WARN_ON(!rdev->scan_req->notified))
1336 rdev->scan_req->info.aborted = true;
1337 ___cfg80211_scan_done(rdev, false);
1338 }
1339
1340 list_for_each_entry_safe(pos, tmp,
1341 &rdev->sched_scan_req_list, list) {
1342 if (WARN_ON(pos->dev == wdev->netdev))
1343 cfg80211_stop_sched_scan_req(rdev, pos, false);
1344 }
1345
1346 rdev->opencount--;
1347 wake_up(&rdev->dev_wait);
1348 break;
1349 case NETDEV_UP:
1350 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1351 wdev_lock(wdev);
1352 switch (wdev->iftype) {
1353 #ifdef CONFIG_CFG80211_WEXT
1354 case NL80211_IFTYPE_ADHOC:
1355 cfg80211_ibss_wext_join(rdev, wdev);
1356 break;
1357 case NL80211_IFTYPE_STATION:
1358 cfg80211_mgd_wext_connect(rdev, wdev);
1359 break;
1360 #endif
1361 #ifdef CONFIG_MAC80211_MESH
1362 case NL80211_IFTYPE_MESH_POINT:
1363 {
1364 /* backward compat code... */
1365 struct mesh_setup setup;
1366 memcpy(&setup, &default_mesh_setup,
1367 sizeof(setup));
1368 /* back compat only needed for mesh_id */
1369 setup.mesh_id = wdev->ssid;
1370 setup.mesh_id_len = wdev->mesh_id_up_len;
1371 if (wdev->mesh_id_up_len)
1372 __cfg80211_join_mesh(rdev, dev,
1373 &setup,
1374 &default_mesh_config);
1375 break;
1376 }
1377 #endif
1378 default:
1379 break;
1380 }
1381 wdev_unlock(wdev);
1382 rdev->opencount++;
1383
1384 /*
1385 * Configure power management to the driver here so that its
1386 * correctly set also after interface type changes etc.
1387 */
1388 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1389 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1390 rdev->ops->set_power_mgmt &&
1391 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1392 wdev->ps_timeout)) {
1393 /* assume this means it's off */
1394 wdev->ps = false;
1395 }
1396 break;
1397 case NETDEV_UNREGISTER:
1398 /*
1399 * It is possible to get NETDEV_UNREGISTER
1400 * multiple times. To detect that, check
1401 * that the interface is still on the list
1402 * of registered interfaces, and only then
1403 * remove and clean it up.
1404 */
1405 if (!list_empty(&wdev->list)) {
1406 __cfg80211_unregister_wdev(wdev, false);
1407 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1408 }
1409 /*
1410 * synchronise (so that we won't find this netdev
1411 * from other code any more) and then clear the list
1412 * head so that the above code can safely check for
1413 * !list_empty() to avoid double-cleanup.
1414 */
1415 synchronize_rcu();
1416 INIT_LIST_HEAD(&wdev->list);
1417 /*
1418 * Ensure that all events have been processed and
1419 * freed.
1420 */
1421 cfg80211_process_wdev_events(wdev);
1422
1423 if (WARN_ON(wdev->current_bss)) {
1424 cfg80211_unhold_bss(wdev->current_bss);
1425 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1426 wdev->current_bss = NULL;
1427 }
1428 break;
1429 case NETDEV_PRE_UP:
1430 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1431 wdev->use_4addr, 0))
1432 return notifier_from_errno(-EOPNOTSUPP);
1433
1434 if (rfkill_blocked(rdev->rfkill))
1435 return notifier_from_errno(-ERFKILL);
1436 break;
1437 default:
1438 return NOTIFY_DONE;
1439 }
1440
1441 wireless_nlevent_flush();
1442
1443 return NOTIFY_OK;
1444 }
1445
1446 static struct notifier_block cfg80211_netdev_notifier = {
1447 .notifier_call = cfg80211_netdev_notifier_call,
1448 };
1449
cfg80211_pernet_exit(struct net * net)1450 static void __net_exit cfg80211_pernet_exit(struct net *net)
1451 {
1452 struct cfg80211_registered_device *rdev;
1453
1454 rtnl_lock();
1455 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1456 if (net_eq(wiphy_net(&rdev->wiphy), net))
1457 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1458 }
1459 rtnl_unlock();
1460 }
1461
1462 static struct pernet_operations cfg80211_pernet_ops = {
1463 .exit = cfg80211_pernet_exit,
1464 };
1465
cfg80211_init(void)1466 static int __init cfg80211_init(void)
1467 {
1468 int err;
1469
1470 err = register_pernet_device(&cfg80211_pernet_ops);
1471 if (err)
1472 goto out_fail_pernet;
1473
1474 err = wiphy_sysfs_init();
1475 if (err)
1476 goto out_fail_sysfs;
1477
1478 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1479 if (err)
1480 goto out_fail_notifier;
1481
1482 err = nl80211_init();
1483 if (err)
1484 goto out_fail_nl80211;
1485
1486 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1487
1488 err = regulatory_init();
1489 if (err)
1490 goto out_fail_reg;
1491
1492 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1493 if (!cfg80211_wq) {
1494 err = -ENOMEM;
1495 goto out_fail_wq;
1496 }
1497
1498 return 0;
1499
1500 out_fail_wq:
1501 regulatory_exit();
1502 out_fail_reg:
1503 debugfs_remove(ieee80211_debugfs_dir);
1504 nl80211_exit();
1505 out_fail_nl80211:
1506 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1507 out_fail_notifier:
1508 wiphy_sysfs_exit();
1509 out_fail_sysfs:
1510 unregister_pernet_device(&cfg80211_pernet_ops);
1511 out_fail_pernet:
1512 return err;
1513 }
1514 fs_initcall(cfg80211_init);
1515
cfg80211_exit(void)1516 static void __exit cfg80211_exit(void)
1517 {
1518 debugfs_remove(ieee80211_debugfs_dir);
1519 nl80211_exit();
1520 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1521 wiphy_sysfs_exit();
1522 regulatory_exit();
1523 unregister_pernet_device(&cfg80211_pernet_ops);
1524 destroy_workqueue(cfg80211_wq);
1525 }
1526 module_exit(cfg80211_exit);
1527