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
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->int_scan_req ||
241 !rdev->int_scan_req->notified)))
242 rdev->scan_req->info.aborted = true;
243 ___cfg80211_scan_done(rdev, false);
244 }
245 }
246
cfg80211_stop_nan(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
248 struct wireless_dev *wdev)
249 {
250 ASSERT_RTNL();
251
252 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
253 return;
254
255 if (!wdev_running(wdev))
256 return;
257
258 rdev_stop_nan(rdev, wdev);
259 wdev->is_running = false;
260
261 rdev->opencount--;
262 }
263
cfg80211_shutdown_all_interfaces(struct wiphy * wiphy)264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
265 {
266 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
267 struct wireless_dev *wdev;
268
269 ASSERT_RTNL();
270
271 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
272 if (wdev->netdev) {
273 dev_close(wdev->netdev);
274 continue;
275 }
276 /* otherwise, check iftype */
277 switch (wdev->iftype) {
278 case NL80211_IFTYPE_P2P_DEVICE:
279 cfg80211_stop_p2p_device(rdev, wdev);
280 break;
281 case NL80211_IFTYPE_NAN:
282 cfg80211_stop_nan(rdev, wdev);
283 break;
284 default:
285 break;
286 }
287 }
288 }
289 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
290
cfg80211_rfkill_set_block(void * data,bool blocked)291 static int cfg80211_rfkill_set_block(void *data, bool blocked)
292 {
293 struct cfg80211_registered_device *rdev = data;
294
295 if (!blocked)
296 return 0;
297
298 rtnl_lock();
299 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
300 rtnl_unlock();
301
302 return 0;
303 }
304
cfg80211_rfkill_block_work(struct work_struct * work)305 static void cfg80211_rfkill_block_work(struct work_struct *work)
306 {
307 struct cfg80211_registered_device *rdev;
308
309 rdev = container_of(work, struct cfg80211_registered_device,
310 rfkill_block);
311 cfg80211_rfkill_set_block(rdev, true);
312 }
313
cfg80211_event_work(struct work_struct * work)314 static void cfg80211_event_work(struct work_struct *work)
315 {
316 struct cfg80211_registered_device *rdev;
317
318 rdev = container_of(work, struct cfg80211_registered_device,
319 event_work);
320
321 rtnl_lock();
322 cfg80211_process_rdev_events(rdev);
323 rtnl_unlock();
324 }
325
cfg80211_destroy_ifaces(struct cfg80211_registered_device * rdev)326 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
327 {
328 struct wireless_dev *wdev, *tmp;
329
330 ASSERT_RTNL();
331
332 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
333 if (wdev->nl_owner_dead)
334 rdev_del_virtual_intf(rdev, wdev);
335 }
336 }
337
cfg80211_destroy_iface_wk(struct work_struct * work)338 static void cfg80211_destroy_iface_wk(struct work_struct *work)
339 {
340 struct cfg80211_registered_device *rdev;
341
342 rdev = container_of(work, struct cfg80211_registered_device,
343 destroy_work);
344
345 rtnl_lock();
346 cfg80211_destroy_ifaces(rdev);
347 rtnl_unlock();
348 }
349
cfg80211_sched_scan_stop_wk(struct work_struct * work)350 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
351 {
352 struct cfg80211_registered_device *rdev;
353 struct cfg80211_sched_scan_request *req, *tmp;
354
355 rdev = container_of(work, struct cfg80211_registered_device,
356 sched_scan_stop_wk);
357
358 rtnl_lock();
359 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
360 if (req->nl_owner_dead)
361 cfg80211_stop_sched_scan_req(rdev, req, false);
362 }
363 rtnl_unlock();
364 }
365
cfg80211_propagate_radar_detect_wk(struct work_struct * work)366 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
367 {
368 struct cfg80211_registered_device *rdev;
369
370 rdev = container_of(work, struct cfg80211_registered_device,
371 propagate_radar_detect_wk);
372
373 rtnl_lock();
374
375 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
376 NL80211_DFS_UNAVAILABLE,
377 NL80211_RADAR_DETECTED);
378
379 rtnl_unlock();
380 }
381
cfg80211_propagate_cac_done_wk(struct work_struct * work)382 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
383 {
384 struct cfg80211_registered_device *rdev;
385
386 rdev = container_of(work, struct cfg80211_registered_device,
387 propagate_cac_done_wk);
388
389 rtnl_lock();
390
391 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
392 NL80211_DFS_AVAILABLE,
393 NL80211_RADAR_CAC_FINISHED);
394
395 rtnl_unlock();
396 }
397
398 /* exported functions */
399
wiphy_new_nm(const struct cfg80211_ops * ops,int sizeof_priv,const char * requested_name)400 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
401 const char *requested_name)
402 {
403 static atomic_t wiphy_counter = ATOMIC_INIT(0);
404
405 struct cfg80211_registered_device *rdev;
406 int alloc_size;
407
408 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
409 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
410 WARN_ON(ops->connect && !ops->disconnect);
411 WARN_ON(ops->join_ibss && !ops->leave_ibss);
412 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
413 WARN_ON(ops->add_station && !ops->del_station);
414 WARN_ON(ops->add_mpath && !ops->del_mpath);
415 WARN_ON(ops->join_mesh && !ops->leave_mesh);
416 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
417 WARN_ON(ops->start_ap && !ops->stop_ap);
418 WARN_ON(ops->join_ocb && !ops->leave_ocb);
419 WARN_ON(ops->suspend && !ops->resume);
420 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
421 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
422 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
423 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
424
425 alloc_size = sizeof(*rdev) + sizeof_priv;
426
427 rdev = kzalloc(alloc_size, GFP_KERNEL);
428 if (!rdev)
429 return NULL;
430
431 rdev->ops = ops;
432
433 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
434
435 if (unlikely(rdev->wiphy_idx < 0)) {
436 /* ugh, wrapped! */
437 atomic_dec(&wiphy_counter);
438 kfree(rdev);
439 return NULL;
440 }
441
442 /* atomic_inc_return makes it start at 1, make it start at 0 */
443 rdev->wiphy_idx--;
444
445 /* give it a proper name */
446 if (requested_name && requested_name[0]) {
447 int rv;
448
449 rtnl_lock();
450 rv = cfg80211_dev_check_name(rdev, requested_name);
451
452 if (rv < 0) {
453 rtnl_unlock();
454 goto use_default_name;
455 }
456
457 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
458 rtnl_unlock();
459 if (rv)
460 goto use_default_name;
461 } else {
462 int rv;
463
464 use_default_name:
465 /* NOTE: This is *probably* safe w/out holding rtnl because of
466 * the restrictions on phy names. Probably this call could
467 * fail if some other part of the kernel (re)named a device
468 * phyX. But, might should add some locking and check return
469 * value, and use a different name if this one exists?
470 */
471 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
472 if (rv < 0) {
473 kfree(rdev);
474 return NULL;
475 }
476 }
477
478 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
479 INIT_LIST_HEAD(&rdev->beacon_registrations);
480 spin_lock_init(&rdev->beacon_registrations_lock);
481 spin_lock_init(&rdev->bss_lock);
482 INIT_LIST_HEAD(&rdev->bss_list);
483 INIT_LIST_HEAD(&rdev->sched_scan_req_list);
484 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
485 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
486 cfg80211_dfs_channels_update_work);
487 #ifdef CONFIG_CFG80211_WEXT
488 rdev->wiphy.wext = &cfg80211_wext_handler;
489 #endif
490
491 device_initialize(&rdev->wiphy.dev);
492 rdev->wiphy.dev.class = &ieee80211_class;
493 rdev->wiphy.dev.platform_data = rdev;
494 device_enable_async_suspend(&rdev->wiphy.dev);
495
496 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
497 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
498 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
499 INIT_WORK(&rdev->propagate_radar_detect_wk,
500 cfg80211_propagate_radar_detect_wk);
501 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
502 INIT_WORK(&rdev->mgmt_registrations_update_wk,
503 cfg80211_mgmt_registrations_update_wk);
504
505 #ifdef CONFIG_CFG80211_DEFAULT_PS
506 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
507 #endif
508
509 wiphy_net_set(&rdev->wiphy, &init_net);
510
511 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
512 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
513 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
514 &rdev->rfkill_ops, rdev);
515
516 if (!rdev->rfkill) {
517 wiphy_free(&rdev->wiphy);
518 return NULL;
519 }
520
521 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
522 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
523 INIT_WORK(&rdev->event_work, cfg80211_event_work);
524
525 init_waitqueue_head(&rdev->dev_wait);
526
527 /*
528 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
529 * Fragmentation and RTS threshold are disabled by default with the
530 * special -1 value.
531 */
532 rdev->wiphy.retry_short = 7;
533 rdev->wiphy.retry_long = 4;
534 rdev->wiphy.frag_threshold = (u32) -1;
535 rdev->wiphy.rts_threshold = (u32) -1;
536 rdev->wiphy.coverage_class = 0;
537
538 rdev->wiphy.max_num_csa_counters = 1;
539
540 rdev->wiphy.max_sched_scan_plans = 1;
541 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
542
543 return &rdev->wiphy;
544 }
545 EXPORT_SYMBOL(wiphy_new_nm);
546
wiphy_verify_combinations(struct wiphy * wiphy)547 static int wiphy_verify_combinations(struct wiphy *wiphy)
548 {
549 const struct ieee80211_iface_combination *c;
550 int i, j;
551
552 for (i = 0; i < wiphy->n_iface_combinations; i++) {
553 u32 cnt = 0;
554 u16 all_iftypes = 0;
555
556 c = &wiphy->iface_combinations[i];
557
558 /*
559 * Combinations with just one interface aren't real,
560 * however we make an exception for DFS.
561 */
562 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
563 return -EINVAL;
564
565 /* Need at least one channel */
566 if (WARN_ON(!c->num_different_channels))
567 return -EINVAL;
568
569 /*
570 * Put a sane limit on maximum number of different
571 * channels to simplify channel accounting code.
572 */
573 if (WARN_ON(c->num_different_channels >
574 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
575 return -EINVAL;
576
577 /* DFS only works on one channel. */
578 if (WARN_ON(c->radar_detect_widths &&
579 (c->num_different_channels > 1)))
580 return -EINVAL;
581
582 if (WARN_ON(!c->n_limits))
583 return -EINVAL;
584
585 for (j = 0; j < c->n_limits; j++) {
586 u16 types = c->limits[j].types;
587
588 /* interface types shouldn't overlap */
589 if (WARN_ON(types & all_iftypes))
590 return -EINVAL;
591 all_iftypes |= types;
592
593 if (WARN_ON(!c->limits[j].max))
594 return -EINVAL;
595
596 /* Shouldn't list software iftypes in combinations! */
597 if (WARN_ON(wiphy->software_iftypes & types))
598 return -EINVAL;
599
600 /* Only a single P2P_DEVICE can be allowed */
601 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
602 c->limits[j].max > 1))
603 return -EINVAL;
604
605 /* Only a single NAN can be allowed */
606 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
607 c->limits[j].max > 1))
608 return -EINVAL;
609
610 /*
611 * This isn't well-defined right now. If you have an
612 * IBSS interface, then its beacon interval may change
613 * by joining other networks, and nothing prevents it
614 * from doing that.
615 * So technically we probably shouldn't even allow AP
616 * and IBSS in the same interface, but it seems that
617 * some drivers support that, possibly only with fixed
618 * beacon intervals for IBSS.
619 */
620 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
621 c->beacon_int_min_gcd)) {
622 return -EINVAL;
623 }
624
625 cnt += c->limits[j].max;
626 /*
627 * Don't advertise an unsupported type
628 * in a combination.
629 */
630 if (WARN_ON((wiphy->interface_modes & types) != types))
631 return -EINVAL;
632 }
633
634 #ifndef CONFIG_WIRELESS_WDS
635 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
636 return -EINVAL;
637 #endif
638
639 /* You can't even choose that many! */
640 if (WARN_ON(cnt < c->max_interfaces))
641 return -EINVAL;
642 }
643
644 return 0;
645 }
646
wiphy_register(struct wiphy * wiphy)647 int wiphy_register(struct wiphy *wiphy)
648 {
649 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
650 int res;
651 enum nl80211_band band;
652 struct ieee80211_supported_band *sband;
653 bool have_band = false;
654 int i;
655 u16 ifmodes = wiphy->interface_modes;
656
657 #ifdef CONFIG_PM
658 if (WARN_ON(wiphy->wowlan &&
659 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
660 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
661 return -EINVAL;
662 if (WARN_ON(wiphy->wowlan &&
663 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
664 !wiphy->wowlan->tcp))
665 return -EINVAL;
666 #endif
667 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
668 (!rdev->ops->tdls_channel_switch ||
669 !rdev->ops->tdls_cancel_channel_switch)))
670 return -EINVAL;
671
672 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
673 (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
674 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
675 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
676 return -EINVAL;
677
678 #ifndef CONFIG_WIRELESS_WDS
679 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
680 return -EINVAL;
681 #endif
682
683 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
684 return -EINVAL;
685
686 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
687 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
688 !wiphy->pmsr_capa->ftm.non_asap))
689 return -EINVAL;
690 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
691 !wiphy->pmsr_capa->ftm.bandwidths))
692 return -EINVAL;
693 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
694 ~(BIT(NL80211_PREAMBLE_LEGACY) |
695 BIT(NL80211_PREAMBLE_HT) |
696 BIT(NL80211_PREAMBLE_VHT) |
697 BIT(NL80211_PREAMBLE_HE) |
698 BIT(NL80211_PREAMBLE_DMG))))
699 return -EINVAL;
700 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
701 wiphy->pmsr_capa->ftm.non_trigger_based) &&
702 !(wiphy->pmsr_capa->ftm.preambles &
703 BIT(NL80211_PREAMBLE_HE))))
704 return -EINVAL;
705 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
706 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
707 BIT(NL80211_CHAN_WIDTH_20) |
708 BIT(NL80211_CHAN_WIDTH_40) |
709 BIT(NL80211_CHAN_WIDTH_80) |
710 BIT(NL80211_CHAN_WIDTH_80P80) |
711 BIT(NL80211_CHAN_WIDTH_160) |
712 BIT(NL80211_CHAN_WIDTH_5) |
713 BIT(NL80211_CHAN_WIDTH_10))))
714 return -EINVAL;
715 }
716
717 /*
718 * if a wiphy has unsupported modes for regulatory channel enforcement,
719 * opt-out of enforcement checking
720 */
721 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
722 BIT(NL80211_IFTYPE_P2P_CLIENT) |
723 BIT(NL80211_IFTYPE_AP) |
724 BIT(NL80211_IFTYPE_P2P_GO) |
725 BIT(NL80211_IFTYPE_ADHOC) |
726 BIT(NL80211_IFTYPE_P2P_DEVICE) |
727 BIT(NL80211_IFTYPE_NAN) |
728 BIT(NL80211_IFTYPE_AP_VLAN) |
729 BIT(NL80211_IFTYPE_MONITOR)))
730 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
731
732 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
733 (wiphy->regulatory_flags &
734 (REGULATORY_CUSTOM_REG |
735 REGULATORY_STRICT_REG |
736 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
737 REGULATORY_COUNTRY_IE_IGNORE))))
738 return -EINVAL;
739
740 if (WARN_ON(wiphy->coalesce &&
741 (!wiphy->coalesce->n_rules ||
742 !wiphy->coalesce->n_patterns) &&
743 (!wiphy->coalesce->pattern_min_len ||
744 wiphy->coalesce->pattern_min_len >
745 wiphy->coalesce->pattern_max_len)))
746 return -EINVAL;
747
748 if (WARN_ON(wiphy->ap_sme_capa &&
749 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
750 return -EINVAL;
751
752 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
753 return -EINVAL;
754
755 if (WARN_ON(wiphy->addresses &&
756 !is_zero_ether_addr(wiphy->perm_addr) &&
757 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
758 ETH_ALEN)))
759 return -EINVAL;
760
761 if (WARN_ON(wiphy->max_acl_mac_addrs &&
762 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
763 !rdev->ops->set_mac_acl)))
764 return -EINVAL;
765
766 /* assure only valid behaviours are flagged by driver
767 * hence subtract 2 as bit 0 is invalid.
768 */
769 if (WARN_ON(wiphy->bss_select_support &&
770 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
771 return -EINVAL;
772
773 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
774 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
775 (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
776 return -EINVAL;
777
778 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
779 rdev->ops->update_connect_params))
780 return -EINVAL;
781
782 if (wiphy->addresses)
783 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
784
785 /* sanity check ifmodes */
786 WARN_ON(!ifmodes);
787 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
788 if (WARN_ON(ifmodes != wiphy->interface_modes))
789 wiphy->interface_modes = ifmodes;
790
791 res = wiphy_verify_combinations(wiphy);
792 if (res)
793 return res;
794
795 /* sanity check supported bands/channels */
796 for (band = 0; band < NUM_NL80211_BANDS; band++) {
797 u16 types = 0;
798 bool have_he = false;
799
800 sband = wiphy->bands[band];
801 if (!sband)
802 continue;
803
804 sband->band = band;
805 if (WARN_ON(!sband->n_channels))
806 return -EINVAL;
807 /*
808 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
809 * n_bitrates is 0
810 */
811 if (WARN_ON((band != NL80211_BAND_60GHZ &&
812 band != NL80211_BAND_S1GHZ) &&
813 !sband->n_bitrates))
814 return -EINVAL;
815
816 if (WARN_ON(band == NL80211_BAND_6GHZ &&
817 (sband->ht_cap.ht_supported ||
818 sband->vht_cap.vht_supported)))
819 return -EINVAL;
820
821 /*
822 * Since cfg80211_disable_40mhz_24ghz is global, we can
823 * modify the sband's ht data even if the driver uses a
824 * global structure for that.
825 */
826 if (cfg80211_disable_40mhz_24ghz &&
827 band == NL80211_BAND_2GHZ &&
828 sband->ht_cap.ht_supported) {
829 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
830 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
831 }
832
833 /*
834 * Since we use a u32 for rate bitmaps in
835 * ieee80211_get_response_rate, we cannot
836 * have more than 32 legacy rates.
837 */
838 if (WARN_ON(sband->n_bitrates > 32))
839 return -EINVAL;
840
841 for (i = 0; i < sband->n_channels; i++) {
842 sband->channels[i].orig_flags =
843 sband->channels[i].flags;
844 sband->channels[i].orig_mag = INT_MAX;
845 sband->channels[i].orig_mpwr =
846 sband->channels[i].max_power;
847 sband->channels[i].band = band;
848
849 if (WARN_ON(sband->channels[i].freq_offset >= 1000))
850 return -EINVAL;
851 }
852
853 for (i = 0; i < sband->n_iftype_data; i++) {
854 const struct ieee80211_sband_iftype_data *iftd;
855
856 iftd = &sband->iftype_data[i];
857
858 if (WARN_ON(!iftd->types_mask))
859 return -EINVAL;
860 if (WARN_ON(types & iftd->types_mask))
861 return -EINVAL;
862
863 /* at least one piece of information must be present */
864 if (WARN_ON(!iftd->he_cap.has_he))
865 return -EINVAL;
866
867 types |= iftd->types_mask;
868
869 if (i == 0)
870 have_he = iftd->he_cap.has_he;
871 else
872 have_he = have_he &&
873 iftd->he_cap.has_he;
874 }
875
876 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
877 return -EINVAL;
878
879 have_band = true;
880 }
881
882 if (!have_band) {
883 WARN_ON(1);
884 return -EINVAL;
885 }
886
887 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
888 /*
889 * Validate we have a policy (can be explicitly set to
890 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
891 * we have at least one of doit/dumpit.
892 */
893 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
894 return -EINVAL;
895 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
896 !rdev->wiphy.vendor_commands[i].dumpit))
897 return -EINVAL;
898 }
899
900 #ifdef CONFIG_PM
901 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
902 (!rdev->wiphy.wowlan->pattern_min_len ||
903 rdev->wiphy.wowlan->pattern_min_len >
904 rdev->wiphy.wowlan->pattern_max_len)))
905 return -EINVAL;
906 #endif
907
908 /* check and set up bitrates */
909 ieee80211_set_bitrate_flags(wiphy);
910
911 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
912
913 rtnl_lock();
914 res = device_add(&rdev->wiphy.dev);
915 if (res) {
916 rtnl_unlock();
917 return res;
918 }
919
920 /* set up regulatory info */
921 wiphy_regulatory_register(wiphy);
922
923 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
924 cfg80211_rdev_list_generation++;
925
926 /* add to debugfs */
927 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
928 ieee80211_debugfs_dir);
929
930 cfg80211_debugfs_rdev_add(rdev);
931 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
932
933 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
934 struct regulatory_request request;
935
936 request.wiphy_idx = get_wiphy_idx(wiphy);
937 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
938 request.alpha2[0] = '9';
939 request.alpha2[1] = '9';
940
941 nl80211_send_reg_change_event(&request);
942 }
943
944 /* Check that nobody globally advertises any capabilities they do not
945 * advertise on all possible interface types.
946 */
947 if (wiphy->extended_capabilities_len &&
948 wiphy->num_iftype_ext_capab &&
949 wiphy->iftype_ext_capab) {
950 u8 supported_on_all, j;
951 const struct wiphy_iftype_ext_capab *capab;
952
953 capab = wiphy->iftype_ext_capab;
954 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
955 if (capab[0].extended_capabilities_len > j)
956 supported_on_all =
957 capab[0].extended_capabilities[j];
958 else
959 supported_on_all = 0x00;
960 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
961 if (j >= capab[i].extended_capabilities_len) {
962 supported_on_all = 0x00;
963 break;
964 }
965 supported_on_all &=
966 capab[i].extended_capabilities[j];
967 }
968 if (WARN_ON(wiphy->extended_capabilities[j] &
969 ~supported_on_all))
970 break;
971 }
972 }
973
974 rdev->wiphy.registered = true;
975 rtnl_unlock();
976
977 res = rfkill_register(rdev->rfkill);
978 if (res) {
979 rfkill_destroy(rdev->rfkill);
980 rdev->rfkill = NULL;
981 wiphy_unregister(&rdev->wiphy);
982 return res;
983 }
984
985 return 0;
986 }
987 EXPORT_SYMBOL(wiphy_register);
988
wiphy_rfkill_start_polling(struct wiphy * wiphy)989 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
990 {
991 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
992
993 if (!rdev->ops->rfkill_poll)
994 return;
995 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
996 rfkill_resume_polling(rdev->rfkill);
997 }
998 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
999
wiphy_rfkill_stop_polling(struct wiphy * wiphy)1000 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
1001 {
1002 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1003
1004 rfkill_pause_polling(rdev->rfkill);
1005 }
1006 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
1007
wiphy_unregister(struct wiphy * wiphy)1008 void wiphy_unregister(struct wiphy *wiphy)
1009 {
1010 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1011
1012 wait_event(rdev->dev_wait, ({
1013 int __count;
1014 rtnl_lock();
1015 __count = rdev->opencount;
1016 rtnl_unlock();
1017 __count == 0; }));
1018
1019 if (rdev->rfkill)
1020 rfkill_unregister(rdev->rfkill);
1021
1022 rtnl_lock();
1023 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1024 rdev->wiphy.registered = false;
1025
1026 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1027
1028 /*
1029 * First remove the hardware from everywhere, this makes
1030 * it impossible to find from userspace.
1031 */
1032 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1033 list_del_rcu(&rdev->list);
1034 synchronize_rcu();
1035
1036 /*
1037 * If this device got a regulatory hint tell core its
1038 * free to listen now to a new shiny device regulatory hint
1039 */
1040 wiphy_regulatory_deregister(wiphy);
1041
1042 cfg80211_rdev_list_generation++;
1043 device_del(&rdev->wiphy.dev);
1044
1045 rtnl_unlock();
1046
1047 flush_work(&rdev->scan_done_wk);
1048 cancel_work_sync(&rdev->conn_work);
1049 flush_work(&rdev->event_work);
1050 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1051 flush_work(&rdev->destroy_work);
1052 flush_work(&rdev->sched_scan_stop_wk);
1053 flush_work(&rdev->propagate_radar_detect_wk);
1054 flush_work(&rdev->propagate_cac_done_wk);
1055 flush_work(&rdev->mgmt_registrations_update_wk);
1056
1057 #ifdef CONFIG_PM
1058 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1059 rdev_set_wakeup(rdev, false);
1060 #endif
1061 cfg80211_rdev_free_wowlan(rdev);
1062 cfg80211_rdev_free_coalesce(rdev);
1063 }
1064 EXPORT_SYMBOL(wiphy_unregister);
1065
cfg80211_dev_free(struct cfg80211_registered_device * rdev)1066 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1067 {
1068 struct cfg80211_internal_bss *scan, *tmp;
1069 struct cfg80211_beacon_registration *reg, *treg;
1070 rfkill_destroy(rdev->rfkill);
1071 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1072 list_del(®->list);
1073 kfree(reg);
1074 }
1075 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1076 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1077 kfree(rdev);
1078 }
1079
wiphy_free(struct wiphy * wiphy)1080 void wiphy_free(struct wiphy *wiphy)
1081 {
1082 put_device(&wiphy->dev);
1083 }
1084 EXPORT_SYMBOL(wiphy_free);
1085
wiphy_rfkill_set_hw_state(struct wiphy * wiphy,bool blocked)1086 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1087 {
1088 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1089
1090 if (rfkill_set_hw_state(rdev->rfkill, blocked))
1091 schedule_work(&rdev->rfkill_block);
1092 }
1093 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1094
cfg80211_cqm_config_free(struct wireless_dev * wdev)1095 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1096 {
1097 kfree(wdev->cqm_config);
1098 wdev->cqm_config = NULL;
1099 }
1100
__cfg80211_unregister_wdev(struct wireless_dev * wdev,bool sync)1101 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1102 {
1103 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1104
1105 ASSERT_RTNL();
1106
1107 flush_work(&wdev->pmsr_free_wk);
1108
1109 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1110
1111 list_del_rcu(&wdev->list);
1112 if (sync)
1113 synchronize_rcu();
1114 rdev->devlist_generation++;
1115
1116 cfg80211_mlme_purge_registrations(wdev);
1117
1118 switch (wdev->iftype) {
1119 case NL80211_IFTYPE_P2P_DEVICE:
1120 cfg80211_stop_p2p_device(rdev, wdev);
1121 break;
1122 case NL80211_IFTYPE_NAN:
1123 cfg80211_stop_nan(rdev, wdev);
1124 break;
1125 default:
1126 break;
1127 }
1128
1129 #ifdef CONFIG_CFG80211_WEXT
1130 kfree_sensitive(wdev->wext.keys);
1131 wdev->wext.keys = NULL;
1132 #endif
1133 /* only initialized if we have a netdev */
1134 if (wdev->netdev)
1135 flush_work(&wdev->disconnect_wk);
1136
1137 cfg80211_cqm_config_free(wdev);
1138 }
1139
cfg80211_unregister_wdev(struct wireless_dev * wdev)1140 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1141 {
1142 if (WARN_ON(wdev->netdev))
1143 return;
1144
1145 __cfg80211_unregister_wdev(wdev, true);
1146 }
1147 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1148
1149 static const struct device_type wiphy_type = {
1150 .name = "wlan",
1151 };
1152
cfg80211_update_iface_num(struct cfg80211_registered_device * rdev,enum nl80211_iftype iftype,int num)1153 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1154 enum nl80211_iftype iftype, int num)
1155 {
1156 ASSERT_RTNL();
1157
1158 rdev->num_running_ifaces += num;
1159 if (iftype == NL80211_IFTYPE_MONITOR)
1160 rdev->num_running_monitor_ifaces += num;
1161 }
1162
__cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1163 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1164 struct wireless_dev *wdev)
1165 {
1166 struct net_device *dev = wdev->netdev;
1167 struct cfg80211_sched_scan_request *pos, *tmp;
1168
1169 ASSERT_RTNL();
1170 ASSERT_WDEV_LOCK(wdev);
1171
1172 cfg80211_pmsr_wdev_down(wdev);
1173
1174 switch (wdev->iftype) {
1175 case NL80211_IFTYPE_ADHOC:
1176 __cfg80211_leave_ibss(rdev, dev, true);
1177 break;
1178 case NL80211_IFTYPE_P2P_CLIENT:
1179 case NL80211_IFTYPE_STATION:
1180 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1181 list) {
1182 if (dev == pos->dev)
1183 cfg80211_stop_sched_scan_req(rdev, pos, false);
1184 }
1185
1186 #ifdef CONFIG_CFG80211_WEXT
1187 kfree(wdev->wext.ie);
1188 wdev->wext.ie = NULL;
1189 wdev->wext.ie_len = 0;
1190 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1191 #endif
1192 cfg80211_disconnect(rdev, dev,
1193 WLAN_REASON_DEAUTH_LEAVING, true);
1194 break;
1195 case NL80211_IFTYPE_MESH_POINT:
1196 __cfg80211_leave_mesh(rdev, dev);
1197 break;
1198 case NL80211_IFTYPE_AP:
1199 case NL80211_IFTYPE_P2P_GO:
1200 __cfg80211_stop_ap(rdev, dev, true);
1201 break;
1202 case NL80211_IFTYPE_OCB:
1203 __cfg80211_leave_ocb(rdev, dev);
1204 break;
1205 case NL80211_IFTYPE_WDS:
1206 /* must be handled by mac80211/driver, has no APIs */
1207 break;
1208 case NL80211_IFTYPE_P2P_DEVICE:
1209 case NL80211_IFTYPE_NAN:
1210 /* cannot happen, has no netdev */
1211 break;
1212 case NL80211_IFTYPE_AP_VLAN:
1213 case NL80211_IFTYPE_MONITOR:
1214 /* nothing to do */
1215 break;
1216 case NL80211_IFTYPE_UNSPECIFIED:
1217 case NUM_NL80211_IFTYPES:
1218 /* invalid */
1219 break;
1220 }
1221 }
1222
cfg80211_leave(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1223 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1224 struct wireless_dev *wdev)
1225 {
1226 wdev_lock(wdev);
1227 __cfg80211_leave(rdev, wdev);
1228 wdev_unlock(wdev);
1229 }
1230
cfg80211_stop_iface(struct wiphy * wiphy,struct wireless_dev * wdev,gfp_t gfp)1231 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1232 gfp_t gfp)
1233 {
1234 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1235 struct cfg80211_event *ev;
1236 unsigned long flags;
1237
1238 trace_cfg80211_stop_iface(wiphy, wdev);
1239
1240 ev = kzalloc(sizeof(*ev), gfp);
1241 if (!ev)
1242 return;
1243
1244 ev->type = EVENT_STOPPED;
1245
1246 spin_lock_irqsave(&wdev->event_lock, flags);
1247 list_add_tail(&ev->list, &wdev->event_list);
1248 spin_unlock_irqrestore(&wdev->event_lock, flags);
1249 queue_work(cfg80211_wq, &rdev->event_work);
1250 }
1251 EXPORT_SYMBOL(cfg80211_stop_iface);
1252
cfg80211_init_wdev(struct wireless_dev * wdev)1253 void cfg80211_init_wdev(struct wireless_dev *wdev)
1254 {
1255 mutex_init(&wdev->mtx);
1256 INIT_LIST_HEAD(&wdev->event_list);
1257 spin_lock_init(&wdev->event_lock);
1258 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1259 spin_lock_init(&wdev->mgmt_registrations_lock);
1260 INIT_LIST_HEAD(&wdev->pmsr_list);
1261 spin_lock_init(&wdev->pmsr_lock);
1262 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1263
1264 #ifdef CONFIG_CFG80211_WEXT
1265 wdev->wext.default_key = -1;
1266 wdev->wext.default_mgmt_key = -1;
1267 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1268 #endif
1269
1270 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1271 wdev->ps = true;
1272 else
1273 wdev->ps = false;
1274 /* allow mac80211 to determine the timeout */
1275 wdev->ps_timeout = -1;
1276
1277 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1278 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1279 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1280 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1281
1282 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1283 }
1284
cfg80211_register_wdev(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)1285 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1286 struct wireless_dev *wdev)
1287 {
1288 /*
1289 * We get here also when the interface changes network namespaces,
1290 * as it's registered into the new one, but we don't want it to
1291 * change ID in that case. Checking if the ID is already assigned
1292 * works, because 0 isn't considered a valid ID and the memory is
1293 * 0-initialized.
1294 */
1295 if (!wdev->identifier)
1296 wdev->identifier = ++rdev->wdev_id;
1297 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1298 rdev->devlist_generation++;
1299
1300 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1301 }
1302
cfg80211_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)1303 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1304 unsigned long state, void *ptr)
1305 {
1306 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1307 struct wireless_dev *wdev = dev->ieee80211_ptr;
1308 struct cfg80211_registered_device *rdev;
1309 struct cfg80211_sched_scan_request *pos, *tmp;
1310
1311 if (!wdev)
1312 return NOTIFY_DONE;
1313
1314 rdev = wiphy_to_rdev(wdev->wiphy);
1315
1316 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1317
1318 switch (state) {
1319 case NETDEV_POST_INIT:
1320 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1321 wdev->netdev = dev;
1322 /* can only change netns with wiphy */
1323 dev->features |= NETIF_F_NETNS_LOCAL;
1324
1325 cfg80211_init_wdev(wdev);
1326 break;
1327 case NETDEV_REGISTER:
1328 /*
1329 * NB: cannot take rdev->mtx here because this may be
1330 * called within code protected by it when interfaces
1331 * are added with nl80211.
1332 */
1333 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1334 "phy80211")) {
1335 pr_err("failed to add phy80211 symlink to netdev!\n");
1336 }
1337
1338 cfg80211_register_wdev(rdev, wdev);
1339 break;
1340 case NETDEV_GOING_DOWN:
1341 cfg80211_leave(rdev, wdev);
1342 break;
1343 case NETDEV_DOWN:
1344 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1345 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1346 if (WARN_ON(!rdev->scan_req->notified &&
1347 (!rdev->int_scan_req ||
1348 !rdev->int_scan_req->notified)))
1349 rdev->scan_req->info.aborted = true;
1350 ___cfg80211_scan_done(rdev, false);
1351 }
1352
1353 list_for_each_entry_safe(pos, tmp,
1354 &rdev->sched_scan_req_list, list) {
1355 if (WARN_ON(pos->dev == wdev->netdev))
1356 cfg80211_stop_sched_scan_req(rdev, pos, false);
1357 }
1358
1359 rdev->opencount--;
1360 wake_up(&rdev->dev_wait);
1361 break;
1362 case NETDEV_UP:
1363 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1364 wdev_lock(wdev);
1365 switch (wdev->iftype) {
1366 #ifdef CONFIG_CFG80211_WEXT
1367 case NL80211_IFTYPE_ADHOC:
1368 cfg80211_ibss_wext_join(rdev, wdev);
1369 break;
1370 case NL80211_IFTYPE_STATION:
1371 cfg80211_mgd_wext_connect(rdev, wdev);
1372 break;
1373 #endif
1374 #ifdef CONFIG_MAC80211_MESH
1375 case NL80211_IFTYPE_MESH_POINT:
1376 {
1377 /* backward compat code... */
1378 struct mesh_setup setup;
1379 memcpy(&setup, &default_mesh_setup,
1380 sizeof(setup));
1381 /* back compat only needed for mesh_id */
1382 setup.mesh_id = wdev->ssid;
1383 setup.mesh_id_len = wdev->mesh_id_up_len;
1384 if (wdev->mesh_id_up_len)
1385 __cfg80211_join_mesh(rdev, dev,
1386 &setup,
1387 &default_mesh_config);
1388 break;
1389 }
1390 #endif
1391 default:
1392 break;
1393 }
1394 wdev_unlock(wdev);
1395 rdev->opencount++;
1396
1397 /*
1398 * Configure power management to the driver here so that its
1399 * correctly set also after interface type changes etc.
1400 */
1401 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1402 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1403 rdev->ops->set_power_mgmt &&
1404 rdev_set_power_mgmt(rdev, dev, wdev->ps,
1405 wdev->ps_timeout)) {
1406 /* assume this means it's off */
1407 wdev->ps = false;
1408 }
1409 break;
1410 case NETDEV_UNREGISTER:
1411 /*
1412 * It is possible to get NETDEV_UNREGISTER
1413 * multiple times. To detect that, check
1414 * that the interface is still on the list
1415 * of registered interfaces, and only then
1416 * remove and clean it up.
1417 */
1418 if (!list_empty(&wdev->list)) {
1419 __cfg80211_unregister_wdev(wdev, false);
1420 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1421 }
1422 /*
1423 * synchronise (so that we won't find this netdev
1424 * from other code any more) and then clear the list
1425 * head so that the above code can safely check for
1426 * !list_empty() to avoid double-cleanup.
1427 */
1428 synchronize_rcu();
1429 INIT_LIST_HEAD(&wdev->list);
1430 /*
1431 * Ensure that all events have been processed and
1432 * freed.
1433 */
1434 cfg80211_process_wdev_events(wdev);
1435
1436 if (WARN_ON(wdev->current_bss)) {
1437 cfg80211_unhold_bss(wdev->current_bss);
1438 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1439 wdev->current_bss = NULL;
1440 }
1441 break;
1442 case NETDEV_PRE_UP:
1443 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1444 wdev->use_4addr, 0))
1445 return notifier_from_errno(-EOPNOTSUPP);
1446
1447 if (rfkill_blocked(rdev->rfkill))
1448 return notifier_from_errno(-ERFKILL);
1449 break;
1450 default:
1451 return NOTIFY_DONE;
1452 }
1453
1454 wireless_nlevent_flush();
1455
1456 return NOTIFY_OK;
1457 }
1458
1459 static struct notifier_block cfg80211_netdev_notifier = {
1460 .notifier_call = cfg80211_netdev_notifier_call,
1461 };
1462
cfg80211_pernet_exit(struct net * net)1463 static void __net_exit cfg80211_pernet_exit(struct net *net)
1464 {
1465 struct cfg80211_registered_device *rdev;
1466
1467 rtnl_lock();
1468 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1469 if (net_eq(wiphy_net(&rdev->wiphy), net))
1470 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1471 }
1472 rtnl_unlock();
1473 }
1474
1475 static struct pernet_operations cfg80211_pernet_ops = {
1476 .exit = cfg80211_pernet_exit,
1477 };
1478
cfg80211_init(void)1479 static int __init cfg80211_init(void)
1480 {
1481 int err;
1482
1483 err = register_pernet_device(&cfg80211_pernet_ops);
1484 if (err)
1485 goto out_fail_pernet;
1486
1487 err = wiphy_sysfs_init();
1488 if (err)
1489 goto out_fail_sysfs;
1490
1491 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1492 if (err)
1493 goto out_fail_notifier;
1494
1495 err = nl80211_init();
1496 if (err)
1497 goto out_fail_nl80211;
1498
1499 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1500
1501 err = regulatory_init();
1502 if (err)
1503 goto out_fail_reg;
1504
1505 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1506 if (!cfg80211_wq) {
1507 err = -ENOMEM;
1508 goto out_fail_wq;
1509 }
1510
1511 return 0;
1512
1513 out_fail_wq:
1514 regulatory_exit();
1515 out_fail_reg:
1516 debugfs_remove(ieee80211_debugfs_dir);
1517 nl80211_exit();
1518 out_fail_nl80211:
1519 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1520 out_fail_notifier:
1521 wiphy_sysfs_exit();
1522 out_fail_sysfs:
1523 unregister_pernet_device(&cfg80211_pernet_ops);
1524 out_fail_pernet:
1525 return err;
1526 }
1527 fs_initcall(cfg80211_init);
1528
cfg80211_exit(void)1529 static void __exit cfg80211_exit(void)
1530 {
1531 debugfs_remove(ieee80211_debugfs_dir);
1532 nl80211_exit();
1533 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1534 wiphy_sysfs_exit();
1535 regulatory_exit();
1536 unregister_pernet_device(&cfg80211_pernet_ops);
1537 destroy_workqueue(cfg80211_wq);
1538 }
1539 module_exit(cfg80211_exit);
1540
