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btrfs: fix sizeof format specifier in btrfs_check_super_valid()
[linux/fpc-iii.git] / net / wireless / core.c
blob53dda7728f866dd3e7df234a242668c5dbe04f20
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 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/if.h>
11 #include <linux/module.h>
12 #include <linux/err.h>
13 #include <linux/list.h>
14 #include <linux/slab.h>
15 #include <linux/nl80211.h>
16 #include <linux/debugfs.h>
17 #include <linux/notifier.h>
18 #include <linux/device.h>
19 #include <linux/etherdevice.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/sched.h>
22 #include <net/genetlink.h>
23 #include <net/cfg80211.h>
24 #include "nl80211.h"
25 #include "core.h"
26 #include "sysfs.h"
27 #include "debugfs.h"
28 #include "wext-compat.h"
29 #include "rdev-ops.h"
30
31 /* name for sysfs, %d is appended */
32 #define PHY_NAME "phy"
33
34 MODULE_AUTHOR("Johannes Berg");
35 MODULE_LICENSE("GPL");
36 MODULE_DESCRIPTION("wireless configuration support");
37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
38
39 /* RCU-protected (and RTNL for writers) */
40 LIST_HEAD(cfg80211_rdev_list);
41 int cfg80211_rdev_list_generation;
42
43 /* for debugfs */
44 static struct dentry *ieee80211_debugfs_dir;
45
46 /* for the cleanup, scan and event works */
47 struct workqueue_struct *cfg80211_wq;
48
49 static bool cfg80211_disable_40mhz_24ghz;
50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
52 "Disable 40MHz support in the 2.4GHz band");
53
54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
55 {
56 struct cfg80211_registered_device *result = NULL, *rdev;
57
58 ASSERT_RTNL();
59
60 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
61 if (rdev->wiphy_idx == wiphy_idx) {
62 result = rdev;
63 break;
64 }
65 }
66
67 return result;
68 }
69
70 int get_wiphy_idx(struct wiphy *wiphy)
71 {
72 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
73
74 return rdev->wiphy_idx;
75 }
76
77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
78 {
79 struct cfg80211_registered_device *rdev;
80
81 ASSERT_RTNL();
82
83 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
84 if (!rdev)
85 return NULL;
86 return &rdev->wiphy;
87 }
88
89 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
90 const char *newname)
91 {
92 struct cfg80211_registered_device *rdev2;
93 int wiphy_idx, taken = -1, digits;
94
95 ASSERT_RTNL();
96
97 /* prohibit calling the thing phy%d when %d is not its number */
98 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
99 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
100 /* count number of places needed to print wiphy_idx */
101 digits = 1;
102 while (wiphy_idx /= 10)
103 digits++;
104 /*
105 * deny the name if it is phy<idx> where <idx> is printed
106 * without leading zeroes. taken == strlen(newname) here
107 */
108 if (taken == strlen(PHY_NAME) + digits)
109 return -EINVAL;
110 }
111
112 /* Ensure another device does not already have this name. */
113 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
114 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
115 return -EINVAL;
116
117 return 0;
118 }
119
120 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
121 char *newname)
122 {
123 int result;
124
125 ASSERT_RTNL();
126
127 /* Ignore nop renames */
128 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
129 return 0;
130
131 result = cfg80211_dev_check_name(rdev, newname);
132 if (result < 0)
133 return result;
134
135 result = device_rename(&rdev->wiphy.dev, newname);
136 if (result)
137 return result;
138
139 if (rdev->wiphy.debugfsdir &&
140 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
141 rdev->wiphy.debugfsdir,
142 rdev->wiphy.debugfsdir->d_parent,
143 newname))
144 pr_err("failed to rename debugfs dir to %s!\n", newname);
145
146 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
147
148 return 0;
149 }
150
151 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
152 struct net *net)
153 {
154 struct wireless_dev *wdev;
155 int err = 0;
156
157 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
158 return -EOPNOTSUPP;
159
160 list_for_each_entry(wdev, &rdev->wdev_list, list) {
161 if (!wdev->netdev)
162 continue;
163 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
164 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
165 if (err)
166 break;
167 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
168 }
169
170 if (err) {
171 /* failed -- clean up to old netns */
172 net = wiphy_net(&rdev->wiphy);
173
174 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
175 list) {
176 if (!wdev->netdev)
177 continue;
178 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
179 err = dev_change_net_namespace(wdev->netdev, net,
180 "wlan%d");
181 WARN_ON(err);
182 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
183 }
184
185 return err;
186 }
187
188 wiphy_net_set(&rdev->wiphy, net);
189
190 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
191 WARN_ON(err);
192
193 return 0;
194 }
195
196 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
197 {
198 struct cfg80211_registered_device *rdev = data;
199
200 rdev_rfkill_poll(rdev);
201 }
202
203 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
204 struct wireless_dev *wdev)
205 {
206 ASSERT_RTNL();
207
208 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
209 return;
210
211 if (!wdev->p2p_started)
212 return;
213
214 rdev_stop_p2p_device(rdev, wdev);
215 wdev->p2p_started = false;
216
217 rdev->opencount--;
218
219 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
220 if (WARN_ON(!rdev->scan_req->notified))
221 rdev->scan_req->aborted = true;
222 ___cfg80211_scan_done(rdev, false);
223 }
224 }
225
226 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
227 {
228 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
229 struct wireless_dev *wdev;
230
231 ASSERT_RTNL();
232
233 list_for_each_entry(wdev, &rdev->wdev_list, list) {
234 if (wdev->netdev) {
235 dev_close(wdev->netdev);
236 continue;
237 }
238 /* otherwise, check iftype */
239 switch (wdev->iftype) {
240 case NL80211_IFTYPE_P2P_DEVICE:
241 cfg80211_stop_p2p_device(rdev, wdev);
242 break;
243 default:
244 break;
245 }
246 }
247 }
248 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
249
250 static int cfg80211_rfkill_set_block(void *data, bool blocked)
251 {
252 struct cfg80211_registered_device *rdev = data;
253
254 if (!blocked)
255 return 0;
256
257 rtnl_lock();
258 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
259 rtnl_unlock();
260
261 return 0;
262 }
263
264 static void cfg80211_rfkill_sync_work(struct work_struct *work)
265 {
266 struct cfg80211_registered_device *rdev;
267
268 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
269 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
270 }
271
272 static void cfg80211_event_work(struct work_struct *work)
273 {
274 struct cfg80211_registered_device *rdev;
275
276 rdev = container_of(work, struct cfg80211_registered_device,
277 event_work);
278
279 rtnl_lock();
280 cfg80211_process_rdev_events(rdev);
281 rtnl_unlock();
282 }
283
284 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
285 {
286 struct cfg80211_iface_destroy *item;
287
288 ASSERT_RTNL();
289
290 spin_lock_irq(&rdev->destroy_list_lock);
291 while ((item = list_first_entry_or_null(&rdev->destroy_list,
292 struct cfg80211_iface_destroy,
293 list))) {
294 struct wireless_dev *wdev, *tmp;
295 u32 nlportid = item->nlportid;
296
297 list_del(&item->list);
298 kfree(item);
299 spin_unlock_irq(&rdev->destroy_list_lock);
300
301 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
302 if (nlportid == wdev->owner_nlportid)
303 rdev_del_virtual_intf(rdev, wdev);
304 }
305
306 spin_lock_irq(&rdev->destroy_list_lock);
307 }
308 spin_unlock_irq(&rdev->destroy_list_lock);
309 }
310
311 static void cfg80211_destroy_iface_wk(struct work_struct *work)
312 {
313 struct cfg80211_registered_device *rdev;
314
315 rdev = container_of(work, struct cfg80211_registered_device,
316 destroy_work);
317
318 rtnl_lock();
319 cfg80211_destroy_ifaces(rdev);
320 rtnl_unlock();
321 }
322
323 /* exported functions */
324
325 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
326 const char *requested_name)
327 {
328 static atomic_t wiphy_counter = ATOMIC_INIT(0);
329
330 struct cfg80211_registered_device *rdev;
331 int alloc_size;
332
333 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
334 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
335 WARN_ON(ops->connect && !ops->disconnect);
336 WARN_ON(ops->join_ibss && !ops->leave_ibss);
337 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
338 WARN_ON(ops->add_station && !ops->del_station);
339 WARN_ON(ops->add_mpath && !ops->del_mpath);
340 WARN_ON(ops->join_mesh && !ops->leave_mesh);
341
342 alloc_size = sizeof(*rdev) + sizeof_priv;
343
344 rdev = kzalloc(alloc_size, GFP_KERNEL);
345 if (!rdev)
346 return NULL;
347
348 rdev->ops = ops;
349
350 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
351
352 if (unlikely(rdev->wiphy_idx < 0)) {
353 /* ugh, wrapped! */
354 atomic_dec(&wiphy_counter);
355 kfree(rdev);
356 return NULL;
357 }
358
359 /* atomic_inc_return makes it start at 1, make it start at 0 */
360 rdev->wiphy_idx--;
361
362 /* give it a proper name */
363 if (requested_name && requested_name[0]) {
364 int rv;
365
366 rtnl_lock();
367 rv = cfg80211_dev_check_name(rdev, requested_name);
368
369 if (rv < 0) {
370 rtnl_unlock();
371 goto use_default_name;
372 }
373
374 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
375 rtnl_unlock();
376 if (rv)
377 goto use_default_name;
378 } else {
379 use_default_name:
380 /* NOTE: This is *probably* safe w/out holding rtnl because of
381 * the restrictions on phy names. Probably this call could
382 * fail if some other part of the kernel (re)named a device
383 * phyX. But, might should add some locking and check return
384 * value, and use a different name if this one exists?
385 */
386 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
387 }
388
389 INIT_LIST_HEAD(&rdev->wdev_list);
390 INIT_LIST_HEAD(&rdev->beacon_registrations);
391 spin_lock_init(&rdev->beacon_registrations_lock);
392 spin_lock_init(&rdev->bss_lock);
393 INIT_LIST_HEAD(&rdev->bss_list);
394 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
395 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
396 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
397 cfg80211_dfs_channels_update_work);
398 #ifdef CONFIG_CFG80211_WEXT
399 rdev->wiphy.wext = &cfg80211_wext_handler;
400 #endif
401
402 device_initialize(&rdev->wiphy.dev);
403 rdev->wiphy.dev.class = &ieee80211_class;
404 rdev->wiphy.dev.platform_data = rdev;
405
406 INIT_LIST_HEAD(&rdev->destroy_list);
407 spin_lock_init(&rdev->destroy_list_lock);
408 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
409
410 #ifdef CONFIG_CFG80211_DEFAULT_PS
411 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
412 #endif
413
414 wiphy_net_set(&rdev->wiphy, &init_net);
415
416 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
417 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
418 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
419 &rdev->rfkill_ops, rdev);
420
421 if (!rdev->rfkill) {
422 kfree(rdev);
423 return NULL;
424 }
425
426 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
427 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
428 INIT_WORK(&rdev->event_work, cfg80211_event_work);
429
430 init_waitqueue_head(&rdev->dev_wait);
431
432 /*
433 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
434 * Fragmentation and RTS threshold are disabled by default with the
435 * special -1 value.
436 */
437 rdev->wiphy.retry_short = 7;
438 rdev->wiphy.retry_long = 4;
439 rdev->wiphy.frag_threshold = (u32) -1;
440 rdev->wiphy.rts_threshold = (u32) -1;
441 rdev->wiphy.coverage_class = 0;
442
443 rdev->wiphy.max_num_csa_counters = 1;
444
445 return &rdev->wiphy;
446 }
447 EXPORT_SYMBOL(wiphy_new_nm);
448
449 static int wiphy_verify_combinations(struct wiphy *wiphy)
450 {
451 const struct ieee80211_iface_combination *c;
452 int i, j;
453
454 for (i = 0; i < wiphy->n_iface_combinations; i++) {
455 u32 cnt = 0;
456 u16 all_iftypes = 0;
457
458 c = &wiphy->iface_combinations[i];
459
460 /*
461 * Combinations with just one interface aren't real,
462 * however we make an exception for DFS.
463 */
464 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
465 return -EINVAL;
466
467 /* Need at least one channel */
468 if (WARN_ON(!c->num_different_channels))
469 return -EINVAL;
470
471 /*
472 * Put a sane limit on maximum number of different
473 * channels to simplify channel accounting code.
474 */
475 if (WARN_ON(c->num_different_channels >
476 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
477 return -EINVAL;
478
479 /* DFS only works on one channel. */
480 if (WARN_ON(c->radar_detect_widths &&
481 (c->num_different_channels > 1)))
482 return -EINVAL;
483
484 if (WARN_ON(!c->n_limits))
485 return -EINVAL;
486
487 for (j = 0; j < c->n_limits; j++) {
488 u16 types = c->limits[j].types;
489
490 /* interface types shouldn't overlap */
491 if (WARN_ON(types & all_iftypes))
492 return -EINVAL;
493 all_iftypes |= types;
494
495 if (WARN_ON(!c->limits[j].max))
496 return -EINVAL;
497
498 /* Shouldn't list software iftypes in combinations! */
499 if (WARN_ON(wiphy->software_iftypes & types))
500 return -EINVAL;
501
502 /* Only a single P2P_DEVICE can be allowed */
503 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
504 c->limits[j].max > 1))
505 return -EINVAL;
506
507 cnt += c->limits[j].max;
508 /*
509 * Don't advertise an unsupported type
510 * in a combination.
511 */
512 if (WARN_ON((wiphy->interface_modes & types) != types))
513 return -EINVAL;
514 }
515
516 /* You can't even choose that many! */
517 if (WARN_ON(cnt < c->max_interfaces))
518 return -EINVAL;
519 }
520
521 return 0;
522 }
523
524 int wiphy_register(struct wiphy *wiphy)
525 {
526 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
527 int res;
528 enum ieee80211_band band;
529 struct ieee80211_supported_band *sband;
530 bool have_band = false;
531 int i;
532 u16 ifmodes = wiphy->interface_modes;
533
534 #ifdef CONFIG_PM
535 if (WARN_ON(wiphy->wowlan &&
536 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
537 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
538 return -EINVAL;
539 if (WARN_ON(wiphy->wowlan &&
540 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
541 !wiphy->wowlan->tcp))
542 return -EINVAL;
543 #endif
544 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
545 (!rdev->ops->tdls_channel_switch ||
546 !rdev->ops->tdls_cancel_channel_switch)))
547 return -EINVAL;
548
549 /*
550 * if a wiphy has unsupported modes for regulatory channel enforcement,
551 * opt-out of enforcement checking
552 */
553 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
554 BIT(NL80211_IFTYPE_P2P_CLIENT) |
555 BIT(NL80211_IFTYPE_AP) |
556 BIT(NL80211_IFTYPE_P2P_GO) |
557 BIT(NL80211_IFTYPE_ADHOC) |
558 BIT(NL80211_IFTYPE_P2P_DEVICE) |
559 BIT(NL80211_IFTYPE_AP_VLAN) |
560 BIT(NL80211_IFTYPE_MONITOR)))
561 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
562
563 if (WARN_ON(wiphy->coalesce &&
564 (!wiphy->coalesce->n_rules ||
565 !wiphy->coalesce->n_patterns) &&
566 (!wiphy->coalesce->pattern_min_len ||
567 wiphy->coalesce->pattern_min_len >
568 wiphy->coalesce->pattern_max_len)))
569 return -EINVAL;
570
571 if (WARN_ON(wiphy->ap_sme_capa &&
572 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
573 return -EINVAL;
574
575 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
576 return -EINVAL;
577
578 if (WARN_ON(wiphy->addresses &&
579 !is_zero_ether_addr(wiphy->perm_addr) &&
580 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
581 ETH_ALEN)))
582 return -EINVAL;
583
584 if (WARN_ON(wiphy->max_acl_mac_addrs &&
585 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
586 !rdev->ops->set_mac_acl)))
587 return -EINVAL;
588
589 if (wiphy->addresses)
590 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
591
592 /* sanity check ifmodes */
593 WARN_ON(!ifmodes);
594 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
595 if (WARN_ON(ifmodes != wiphy->interface_modes))
596 wiphy->interface_modes = ifmodes;
597
598 res = wiphy_verify_combinations(wiphy);
599 if (res)
600 return res;
601
602 /* sanity check supported bands/channels */
603 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
604 sband = wiphy->bands[band];
605 if (!sband)
606 continue;
607
608 sband->band = band;
609 if (WARN_ON(!sband->n_channels))
610 return -EINVAL;
611 /*
612 * on 60gHz band, there are no legacy rates, so
613 * n_bitrates is 0
614 */
615 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
616 !sband->n_bitrates))
617 return -EINVAL;
618
619 /*
620 * Since cfg80211_disable_40mhz_24ghz is global, we can
621 * modify the sband's ht data even if the driver uses a
622 * global structure for that.
623 */
624 if (cfg80211_disable_40mhz_24ghz &&
625 band == IEEE80211_BAND_2GHZ &&
626 sband->ht_cap.ht_supported) {
627 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
628 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
629 }
630
631 /*
632 * Since we use a u32 for rate bitmaps in
633 * ieee80211_get_response_rate, we cannot
634 * have more than 32 legacy rates.
635 */
636 if (WARN_ON(sband->n_bitrates > 32))
637 return -EINVAL;
638
639 for (i = 0; i < sband->n_channels; i++) {
640 sband->channels[i].orig_flags =
641 sband->channels[i].flags;
642 sband->channels[i].orig_mag = INT_MAX;
643 sband->channels[i].orig_mpwr =
644 sband->channels[i].max_power;
645 sband->channels[i].band = band;
646 }
647
648 have_band = true;
649 }
650
651 if (!have_band) {
652 WARN_ON(1);
653 return -EINVAL;
654 }
655
656 #ifdef CONFIG_PM
657 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
658 (!rdev->wiphy.wowlan->pattern_min_len ||
659 rdev->wiphy.wowlan->pattern_min_len >
660 rdev->wiphy.wowlan->pattern_max_len)))
661 return -EINVAL;
662 #endif
663
664 /* check and set up bitrates */
665 ieee80211_set_bitrate_flags(wiphy);
666
667 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
668
669 rtnl_lock();
670 res = device_add(&rdev->wiphy.dev);
671 if (res) {
672 rtnl_unlock();
673 return res;
674 }
675
676 /* set up regulatory info */
677 wiphy_regulatory_register(wiphy);
678
679 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
680 cfg80211_rdev_list_generation++;
681
682 /* add to debugfs */
683 rdev->wiphy.debugfsdir =
684 debugfs_create_dir(wiphy_name(&rdev->wiphy),
685 ieee80211_debugfs_dir);
686 if (IS_ERR(rdev->wiphy.debugfsdir))
687 rdev->wiphy.debugfsdir = NULL;
688
689 cfg80211_debugfs_rdev_add(rdev);
690 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
691
692 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
693 struct regulatory_request request;
694
695 request.wiphy_idx = get_wiphy_idx(wiphy);
696 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
697 request.alpha2[0] = '9';
698 request.alpha2[1] = '9';
699
700 nl80211_send_reg_change_event(&request);
701 }
702
703 rdev->wiphy.registered = true;
704 rtnl_unlock();
705
706 res = rfkill_register(rdev->rfkill);
707 if (res) {
708 rfkill_destroy(rdev->rfkill);
709 rdev->rfkill = NULL;
710 wiphy_unregister(&rdev->wiphy);
711 return res;
712 }
713
714 return 0;
715 }
716 EXPORT_SYMBOL(wiphy_register);
717
718 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
719 {
720 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
721
722 if (!rdev->ops->rfkill_poll)
723 return;
724 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
725 rfkill_resume_polling(rdev->rfkill);
726 }
727 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
728
729 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
730 {
731 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
732
733 rfkill_pause_polling(rdev->rfkill);
734 }
735 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
736
737 void wiphy_unregister(struct wiphy *wiphy)
738 {
739 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
740
741 wait_event(rdev->dev_wait, ({
742 int __count;
743 rtnl_lock();
744 __count = rdev->opencount;
745 rtnl_unlock();
746 __count == 0; }));
747
748 if (rdev->rfkill)
749 rfkill_unregister(rdev->rfkill);
750
751 rtnl_lock();
752 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
753 rdev->wiphy.registered = false;
754
755 WARN_ON(!list_empty(&rdev->wdev_list));
756
757 /*
758 * First remove the hardware from everywhere, this makes
759 * it impossible to find from userspace.
760 */
761 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
762 list_del_rcu(&rdev->list);
763 synchronize_rcu();
764
765 /*
766 * If this device got a regulatory hint tell core its
767 * free to listen now to a new shiny device regulatory hint
768 */
769 wiphy_regulatory_deregister(wiphy);
770
771 cfg80211_rdev_list_generation++;
772 device_del(&rdev->wiphy.dev);
773
774 rtnl_unlock();
775
776 flush_work(&rdev->scan_done_wk);
777 cancel_work_sync(&rdev->conn_work);
778 flush_work(&rdev->event_work);
779 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
780 flush_work(&rdev->destroy_work);
781
782 #ifdef CONFIG_PM
783 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
784 rdev_set_wakeup(rdev, false);
785 #endif
786 cfg80211_rdev_free_wowlan(rdev);
787 cfg80211_rdev_free_coalesce(rdev);
788 }
789 EXPORT_SYMBOL(wiphy_unregister);
790
791 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
792 {
793 struct cfg80211_internal_bss *scan, *tmp;
794 struct cfg80211_beacon_registration *reg, *treg;
795 rfkill_destroy(rdev->rfkill);
796 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
797 list_del(&reg->list);
798 kfree(reg);
799 }
800 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
801 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
802 kfree(rdev);
803 }
804
805 void wiphy_free(struct wiphy *wiphy)
806 {
807 put_device(&wiphy->dev);
808 }
809 EXPORT_SYMBOL(wiphy_free);
810
811 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
812 {
813 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
814
815 if (rfkill_set_hw_state(rdev->rfkill, blocked))
816 schedule_work(&rdev->rfkill_sync);
817 }
818 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
819
820 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
821 {
822 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
823
824 ASSERT_RTNL();
825
826 if (WARN_ON(wdev->netdev))
827 return;
828
829 list_del_rcu(&wdev->list);
830 rdev->devlist_generation++;
831
832 switch (wdev->iftype) {
833 case NL80211_IFTYPE_P2P_DEVICE:
834 cfg80211_stop_p2p_device(rdev, wdev);
835 break;
836 default:
837 WARN_ON_ONCE(1);
838 break;
839 }
840 }
841 EXPORT_SYMBOL(cfg80211_unregister_wdev);
842
843 static const struct device_type wiphy_type = {
844 .name = "wlan",
845 };
846
847 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
848 enum nl80211_iftype iftype, int num)
849 {
850 ASSERT_RTNL();
851
852 rdev->num_running_ifaces += num;
853 if (iftype == NL80211_IFTYPE_MONITOR)
854 rdev->num_running_monitor_ifaces += num;
855 }
856
857 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
858 struct wireless_dev *wdev)
859 {
860 struct net_device *dev = wdev->netdev;
861
862 ASSERT_RTNL();
863 ASSERT_WDEV_LOCK(wdev);
864
865 switch (wdev->iftype) {
866 case NL80211_IFTYPE_ADHOC:
867 __cfg80211_leave_ibss(rdev, dev, true);
868 break;
869 case NL80211_IFTYPE_P2P_CLIENT:
870 case NL80211_IFTYPE_STATION:
871 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev)
872 __cfg80211_stop_sched_scan(rdev, false);
873
874 #ifdef CONFIG_CFG80211_WEXT
875 kfree(wdev->wext.ie);
876 wdev->wext.ie = NULL;
877 wdev->wext.ie_len = 0;
878 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
879 #endif
880 cfg80211_disconnect(rdev, dev,
881 WLAN_REASON_DEAUTH_LEAVING, true);
882 break;
883 case NL80211_IFTYPE_MESH_POINT:
884 __cfg80211_leave_mesh(rdev, dev);
885 break;
886 case NL80211_IFTYPE_AP:
887 case NL80211_IFTYPE_P2P_GO:
888 __cfg80211_stop_ap(rdev, dev, true);
889 break;
890 case NL80211_IFTYPE_OCB:
891 __cfg80211_leave_ocb(rdev, dev);
892 break;
893 case NL80211_IFTYPE_WDS:
894 /* must be handled by mac80211/driver, has no APIs */
895 break;
896 case NL80211_IFTYPE_P2P_DEVICE:
897 /* cannot happen, has no netdev */
898 break;
899 case NL80211_IFTYPE_AP_VLAN:
900 case NL80211_IFTYPE_MONITOR:
901 /* nothing to do */
902 break;
903 case NL80211_IFTYPE_UNSPECIFIED:
904 case NUM_NL80211_IFTYPES:
905 /* invalid */
906 break;
907 }
908 }
909
910 void cfg80211_leave(struct cfg80211_registered_device *rdev,
911 struct wireless_dev *wdev)
912 {
913 wdev_lock(wdev);
914 __cfg80211_leave(rdev, wdev);
915 wdev_unlock(wdev);
916 }
917
918 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
919 gfp_t gfp)
920 {
921 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
922 struct cfg80211_event *ev;
923 unsigned long flags;
924
925 trace_cfg80211_stop_iface(wiphy, wdev);
926
927 ev = kzalloc(sizeof(*ev), gfp);
928 if (!ev)
929 return;
930
931 ev->type = EVENT_STOPPED;
932
933 spin_lock_irqsave(&wdev->event_lock, flags);
934 list_add_tail(&ev->list, &wdev->event_list);
935 spin_unlock_irqrestore(&wdev->event_lock, flags);
936 queue_work(cfg80211_wq, &rdev->event_work);
937 }
938 EXPORT_SYMBOL(cfg80211_stop_iface);
939
940 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
941 unsigned long state, void *ptr)
942 {
943 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
944 struct wireless_dev *wdev = dev->ieee80211_ptr;
945 struct cfg80211_registered_device *rdev;
946
947 if (!wdev)
948 return NOTIFY_DONE;
949
950 rdev = wiphy_to_rdev(wdev->wiphy);
951
952 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
953
954 switch (state) {
955 case NETDEV_POST_INIT:
956 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
957 break;
958 case NETDEV_REGISTER:
959 /*
960 * NB: cannot take rdev->mtx here because this may be
961 * called within code protected by it when interfaces
962 * are added with nl80211.
963 */
964 mutex_init(&wdev->mtx);
965 INIT_LIST_HEAD(&wdev->event_list);
966 spin_lock_init(&wdev->event_lock);
967 INIT_LIST_HEAD(&wdev->mgmt_registrations);
968 spin_lock_init(&wdev->mgmt_registrations_lock);
969
970 wdev->identifier = ++rdev->wdev_id;
971 list_add_rcu(&wdev->list, &rdev->wdev_list);
972 rdev->devlist_generation++;
973 /* can only change netns with wiphy */
974 dev->features |= NETIF_F_NETNS_LOCAL;
975
976 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
977 "phy80211")) {
978 pr_err("failed to add phy80211 symlink to netdev!\n");
979 }
980 wdev->netdev = dev;
981 #ifdef CONFIG_CFG80211_WEXT
982 wdev->wext.default_key = -1;
983 wdev->wext.default_mgmt_key = -1;
984 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
985 #endif
986
987 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
988 wdev->ps = true;
989 else
990 wdev->ps = false;
991 /* allow mac80211 to determine the timeout */
992 wdev->ps_timeout = -1;
993
994 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
995 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
996 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
997 dev->priv_flags |= IFF_DONT_BRIDGE;
998 break;
999 case NETDEV_GOING_DOWN:
1000 cfg80211_leave(rdev, wdev);
1001 break;
1002 case NETDEV_DOWN:
1003 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1004 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1005 if (WARN_ON(!rdev->scan_req->notified))
1006 rdev->scan_req->aborted = true;
1007 ___cfg80211_scan_done(rdev, false);
1008 }
1009
1010 if (WARN_ON(rdev->sched_scan_req &&
1011 rdev->sched_scan_req->dev == wdev->netdev)) {
1012 __cfg80211_stop_sched_scan(rdev, false);
1013 }
1014
1015 rdev->opencount--;
1016 wake_up(&rdev->dev_wait);
1017 break;
1018 case NETDEV_UP:
1019 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1020 wdev_lock(wdev);
1021 switch (wdev->iftype) {
1022 #ifdef CONFIG_CFG80211_WEXT
1023 case NL80211_IFTYPE_ADHOC:
1024 cfg80211_ibss_wext_join(rdev, wdev);
1025 break;
1026 case NL80211_IFTYPE_STATION:
1027 cfg80211_mgd_wext_connect(rdev, wdev);
1028 break;
1029 #endif
1030 #ifdef CONFIG_MAC80211_MESH
1031 case NL80211_IFTYPE_MESH_POINT:
1032 {
1033 /* backward compat code... */
1034 struct mesh_setup setup;
1035 memcpy(&setup, &default_mesh_setup,
1036 sizeof(setup));
1037 /* back compat only needed for mesh_id */
1038 setup.mesh_id = wdev->ssid;
1039 setup.mesh_id_len = wdev->mesh_id_up_len;
1040 if (wdev->mesh_id_up_len)
1041 __cfg80211_join_mesh(rdev, dev,
1042 &setup,
1043 &default_mesh_config);
1044 break;
1045 }
1046 #endif
1047 default:
1048 break;
1049 }
1050 wdev_unlock(wdev);
1051 rdev->opencount++;
1052
1053 /*
1054 * Configure power management to the driver here so that its
1055 * correctly set also after interface type changes etc.
1056 */
1057 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1058 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1059 rdev->ops->set_power_mgmt)
1060 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1061 wdev->ps_timeout)) {
1062 /* assume this means it's off */
1063 wdev->ps = false;
1064 }
1065 break;
1066 case NETDEV_UNREGISTER:
1067 /*
1068 * It is possible to get NETDEV_UNREGISTER
1069 * multiple times. To detect that, check
1070 * that the interface is still on the list
1071 * of registered interfaces, and only then
1072 * remove and clean it up.
1073 */
1074 if (!list_empty(&wdev->list)) {
1075 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1076 list_del_rcu(&wdev->list);
1077 rdev->devlist_generation++;
1078 cfg80211_mlme_purge_registrations(wdev);
1079 #ifdef CONFIG_CFG80211_WEXT
1080 kzfree(wdev->wext.keys);
1081 #endif
1082 }
1083 /*
1084 * synchronise (so that we won't find this netdev
1085 * from other code any more) and then clear the list
1086 * head so that the above code can safely check for
1087 * !list_empty() to avoid double-cleanup.
1088 */
1089 synchronize_rcu();
1090 INIT_LIST_HEAD(&wdev->list);
1091 /*
1092 * Ensure that all events have been processed and
1093 * freed.
1094 */
1095 cfg80211_process_wdev_events(wdev);
1096
1097 if (WARN_ON(wdev->current_bss)) {
1098 cfg80211_unhold_bss(wdev->current_bss);
1099 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1100 wdev->current_bss = NULL;
1101 }
1102 break;
1103 case NETDEV_PRE_UP:
1104 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1105 return notifier_from_errno(-EOPNOTSUPP);
1106 if (rfkill_blocked(rdev->rfkill))
1107 return notifier_from_errno(-ERFKILL);
1108 break;
1109 default:
1110 return NOTIFY_DONE;
1111 }
1112
1113 return NOTIFY_OK;
1114 }
1115
1116 static struct notifier_block cfg80211_netdev_notifier = {
1117 .notifier_call = cfg80211_netdev_notifier_call,
1118 };
1119
1120 static void __net_exit cfg80211_pernet_exit(struct net *net)
1121 {
1122 struct cfg80211_registered_device *rdev;
1123
1124 rtnl_lock();
1125 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1126 if (net_eq(wiphy_net(&rdev->wiphy), net))
1127 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1128 }
1129 rtnl_unlock();
1130 }
1131
1132 static struct pernet_operations cfg80211_pernet_ops = {
1133 .exit = cfg80211_pernet_exit,
1134 };
1135
1136 static int __init cfg80211_init(void)
1137 {
1138 int err;
1139
1140 err = register_pernet_device(&cfg80211_pernet_ops);
1141 if (err)
1142 goto out_fail_pernet;
1143
1144 err = wiphy_sysfs_init();
1145 if (err)
1146 goto out_fail_sysfs;
1147
1148 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1149 if (err)
1150 goto out_fail_notifier;
1151
1152 err = nl80211_init();
1153 if (err)
1154 goto out_fail_nl80211;
1155
1156 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1157
1158 err = regulatory_init();
1159 if (err)
1160 goto out_fail_reg;
1161
1162 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1163 if (!cfg80211_wq) {
1164 err = -ENOMEM;
1165 goto out_fail_wq;
1166 }
1167
1168 return 0;
1169
1170 out_fail_wq:
1171 regulatory_exit();
1172 out_fail_reg:
1173 debugfs_remove(ieee80211_debugfs_dir);
1174 out_fail_nl80211:
1175 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1176 out_fail_notifier:
1177 wiphy_sysfs_exit();
1178 out_fail_sysfs:
1179 unregister_pernet_device(&cfg80211_pernet_ops);
1180 out_fail_pernet:
1181 return err;
1182 }
1183 subsys_initcall(cfg80211_init);
1184
1185 static void __exit cfg80211_exit(void)
1186 {
1187 debugfs_remove(ieee80211_debugfs_dir);
1188 nl80211_exit();
1189 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1190 wiphy_sysfs_exit();
1191 regulatory_exit();
1192 unregister_pernet_device(&cfg80211_pernet_ops);
1193 destroy_workqueue(cfg80211_wq);
1194 }
1195 module_exit(cfg80211_exit);
Linux with added FPC-III support