projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blob
? search:


8f0bac7e03c406466e0b5ca2b01b3ca2574ab79f
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / net / wireless / core.c
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 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
324 {
325 struct cfg80211_registered_device *rdev;
326
327 rdev = container_of(work, struct cfg80211_registered_device,
328 sched_scan_stop_wk);
329
330 rtnl_lock();
331
332 __cfg80211_stop_sched_scan(rdev, false);
333
334 rtnl_unlock();
335 }
336
337 /* exported functions */
338
339 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
340 const char *requested_name)
341 {
342 static atomic_t wiphy_counter = ATOMIC_INIT(0);
343
344 struct cfg80211_registered_device *rdev;
345 int alloc_size;
346
347 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
348 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
349 WARN_ON(ops->connect && !ops->disconnect);
350 WARN_ON(ops->join_ibss && !ops->leave_ibss);
351 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
352 WARN_ON(ops->add_station && !ops->del_station);
353 WARN_ON(ops->add_mpath && !ops->del_mpath);
354 WARN_ON(ops->join_mesh && !ops->leave_mesh);
355
356 alloc_size = sizeof(*rdev) + sizeof_priv;
357
358 rdev = kzalloc(alloc_size, GFP_KERNEL);
359 if (!rdev)
360 return NULL;
361
362 rdev->ops = ops;
363
364 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
365
366 if (unlikely(rdev->wiphy_idx < 0)) {
367 /* ugh, wrapped! */
368 atomic_dec(&wiphy_counter);
369 kfree(rdev);
370 return NULL;
371 }
372
373 /* atomic_inc_return makes it start at 1, make it start at 0 */
374 rdev->wiphy_idx--;
375
376 /* give it a proper name */
377 if (requested_name && requested_name[0]) {
378 int rv;
379
380 rtnl_lock();
381 rv = cfg80211_dev_check_name(rdev, requested_name);
382
383 if (rv < 0) {
384 rtnl_unlock();
385 goto use_default_name;
386 }
387
388 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
389 rtnl_unlock();
390 if (rv)
391 goto use_default_name;
392 } else {
393 use_default_name:
394 /* NOTE: This is *probably* safe w/out holding rtnl because of
395 * the restrictions on phy names. Probably this call could
396 * fail if some other part of the kernel (re)named a device
397 * phyX. But, might should add some locking and check return
398 * value, and use a different name if this one exists?
399 */
400 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
401 }
402
403 INIT_LIST_HEAD(&rdev->wdev_list);
404 INIT_LIST_HEAD(&rdev->beacon_registrations);
405 spin_lock_init(&rdev->beacon_registrations_lock);
406 spin_lock_init(&rdev->bss_lock);
407 INIT_LIST_HEAD(&rdev->bss_list);
408 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
409 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
410 INIT_LIST_HEAD(&rdev->mlme_unreg);
411 spin_lock_init(&rdev->mlme_unreg_lock);
412 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
413 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
414 cfg80211_dfs_channels_update_work);
415 #ifdef CONFIG_CFG80211_WEXT
416 rdev->wiphy.wext = &cfg80211_wext_handler;
417 #endif
418
419 device_initialize(&rdev->wiphy.dev);
420 rdev->wiphy.dev.class = &ieee80211_class;
421 rdev->wiphy.dev.platform_data = rdev;
422 device_enable_async_suspend(&rdev->wiphy.dev);
423
424 INIT_LIST_HEAD(&rdev->destroy_list);
425 spin_lock_init(&rdev->destroy_list_lock);
426 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
427 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
428
429 #ifdef CONFIG_CFG80211_DEFAULT_PS
430 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
431 #endif
432
433 wiphy_net_set(&rdev->wiphy, &init_net);
434
435 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
436 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
437 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
438 &rdev->rfkill_ops, rdev);
439
440 if (!rdev->rfkill) {
441 kfree(rdev);
442 return NULL;
443 }
444
445 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
446 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
447 INIT_WORK(&rdev->event_work, cfg80211_event_work);
448
449 init_waitqueue_head(&rdev->dev_wait);
450
451 /*
452 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
453 * Fragmentation and RTS threshold are disabled by default with the
454 * special -1 value.
455 */
456 rdev->wiphy.retry_short = 7;
457 rdev->wiphy.retry_long = 4;
458 rdev->wiphy.frag_threshold = (u32) -1;
459 rdev->wiphy.rts_threshold = (u32) -1;
460 rdev->wiphy.coverage_class = 0;
461
462 rdev->wiphy.max_num_csa_counters = 1;
463
464 rdev->wiphy.max_sched_scan_plans = 1;
465 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
466
467 return &rdev->wiphy;
468 }
469 EXPORT_SYMBOL(wiphy_new_nm);
470
471 static int wiphy_verify_combinations(struct wiphy *wiphy)
472 {
473 const struct ieee80211_iface_combination *c;
474 int i, j;
475
476 for (i = 0; i < wiphy->n_iface_combinations; i++) {
477 u32 cnt = 0;
478 u16 all_iftypes = 0;
479
480 c = &wiphy->iface_combinations[i];
481
482 /*
483 * Combinations with just one interface aren't real,
484 * however we make an exception for DFS.
485 */
486 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
487 return -EINVAL;
488
489 /* Need at least one channel */
490 if (WARN_ON(!c->num_different_channels))
491 return -EINVAL;
492
493 /*
494 * Put a sane limit on maximum number of different
495 * channels to simplify channel accounting code.
496 */
497 if (WARN_ON(c->num_different_channels >
498 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
499 return -EINVAL;
500
501 /* DFS only works on one channel. */
502 if (WARN_ON(c->radar_detect_widths &&
503 (c->num_different_channels > 1)))
504 return -EINVAL;
505
506 if (WARN_ON(!c->n_limits))
507 return -EINVAL;
508
509 for (j = 0; j < c->n_limits; j++) {
510 u16 types = c->limits[j].types;
511
512 /* interface types shouldn't overlap */
513 if (WARN_ON(types & all_iftypes))
514 return -EINVAL;
515 all_iftypes |= types;
516
517 if (WARN_ON(!c->limits[j].max))
518 return -EINVAL;
519
520 /* Shouldn't list software iftypes in combinations! */
521 if (WARN_ON(wiphy->software_iftypes & types))
522 return -EINVAL;
523
524 /* Only a single P2P_DEVICE can be allowed */
525 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
526 c->limits[j].max > 1))
527 return -EINVAL;
528
529 cnt += c->limits[j].max;
530 /*
531 * Don't advertise an unsupported type
532 * in a combination.
533 */
534 if (WARN_ON((wiphy->interface_modes & types) != types))
535 return -EINVAL;
536 }
537
538 /* You can't even choose that many! */
539 if (WARN_ON(cnt < c->max_interfaces))
540 return -EINVAL;
541 }
542
543 return 0;
544 }
545
546 int wiphy_register(struct wiphy *wiphy)
547 {
548 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
549 int res;
550 enum ieee80211_band band;
551 struct ieee80211_supported_band *sband;
552 bool have_band = false;
553 int i;
554 u16 ifmodes = wiphy->interface_modes;
555
556 #ifdef CONFIG_PM
557 if (WARN_ON(wiphy->wowlan &&
558 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
559 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
560 return -EINVAL;
561 if (WARN_ON(wiphy->wowlan &&
562 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
563 !wiphy->wowlan->tcp))
564 return -EINVAL;
565 #endif
566 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
567 (!rdev->ops->tdls_channel_switch ||
568 !rdev->ops->tdls_cancel_channel_switch)))
569 return -EINVAL;
570
571 /*
572 * if a wiphy has unsupported modes for regulatory channel enforcement,
573 * opt-out of enforcement checking
574 */
575 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
576 BIT(NL80211_IFTYPE_P2P_CLIENT) |
577 BIT(NL80211_IFTYPE_AP) |
578 BIT(NL80211_IFTYPE_P2P_GO) |
579 BIT(NL80211_IFTYPE_ADHOC) |
580 BIT(NL80211_IFTYPE_P2P_DEVICE) |
581 BIT(NL80211_IFTYPE_AP_VLAN) |
582 BIT(NL80211_IFTYPE_MONITOR)))
583 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
584
585 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
586 (wiphy->regulatory_flags &
587 (REGULATORY_CUSTOM_REG |
588 REGULATORY_STRICT_REG |
589 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
590 REGULATORY_COUNTRY_IE_IGNORE))))
591 return -EINVAL;
592
593 if (WARN_ON(wiphy->coalesce &&
594 (!wiphy->coalesce->n_rules ||
595 !wiphy->coalesce->n_patterns) &&
596 (!wiphy->coalesce->pattern_min_len ||
597 wiphy->coalesce->pattern_min_len >
598 wiphy->coalesce->pattern_max_len)))
599 return -EINVAL;
600
601 if (WARN_ON(wiphy->ap_sme_capa &&
602 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
603 return -EINVAL;
604
605 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
606 return -EINVAL;
607
608 if (WARN_ON(wiphy->addresses &&
609 !is_zero_ether_addr(wiphy->perm_addr) &&
610 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
611 ETH_ALEN)))
612 return -EINVAL;
613
614 if (WARN_ON(wiphy->max_acl_mac_addrs &&
615 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
616 !rdev->ops->set_mac_acl)))
617 return -EINVAL;
618
619 if (wiphy->addresses)
620 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
621
622 /* sanity check ifmodes */
623 WARN_ON(!ifmodes);
624 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
625 if (WARN_ON(ifmodes != wiphy->interface_modes))
626 wiphy->interface_modes = ifmodes;
627
628 res = wiphy_verify_combinations(wiphy);
629 if (res)
630 return res;
631
632 /* sanity check supported bands/channels */
633 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
634 sband = wiphy->bands[band];
635 if (!sband)
636 continue;
637
638 sband->band = band;
639 if (WARN_ON(!sband->n_channels))
640 return -EINVAL;
641 /*
642 * on 60GHz band, there are no legacy rates, so
643 * n_bitrates is 0
644 */
645 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
646 !sband->n_bitrates))
647 return -EINVAL;
648
649 /*
650 * Since cfg80211_disable_40mhz_24ghz is global, we can
651 * modify the sband's ht data even if the driver uses a
652 * global structure for that.
653 */
654 if (cfg80211_disable_40mhz_24ghz &&
655 band == IEEE80211_BAND_2GHZ &&
656 sband->ht_cap.ht_supported) {
657 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
658 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
659 }
660
661 /*
662 * Since we use a u32 for rate bitmaps in
663 * ieee80211_get_response_rate, we cannot
664 * have more than 32 legacy rates.
665 */
666 if (WARN_ON(sband->n_bitrates > 32))
667 return -EINVAL;
668
669 for (i = 0; i < sband->n_channels; i++) {
670 sband->channels[i].orig_flags =
671 sband->channels[i].flags;
672 sband->channels[i].orig_mag = INT_MAX;
673 sband->channels[i].orig_mpwr =
674 sband->channels[i].max_power;
675 sband->channels[i].band = band;
676 }
677
678 have_band = true;
679 }
680
681 if (!have_band) {
682 WARN_ON(1);
683 return -EINVAL;
684 }
685
686 #ifdef CONFIG_PM
687 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
688 (!rdev->wiphy.wowlan->pattern_min_len ||
689 rdev->wiphy.wowlan->pattern_min_len >
690 rdev->wiphy.wowlan->pattern_max_len)))
691 return -EINVAL;
692 #endif
693
694 /* check and set up bitrates */
695 ieee80211_set_bitrate_flags(wiphy);
696
697 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
698
699 rtnl_lock();
700 res = device_add(&rdev->wiphy.dev);
701 if (res) {
702 rtnl_unlock();
703 return res;
704 }
705
706 /* set up regulatory info */
707 wiphy_regulatory_register(wiphy);
708
709 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
710 cfg80211_rdev_list_generation++;
711
712 /* add to debugfs */
713 rdev->wiphy.debugfsdir =
714 debugfs_create_dir(wiphy_name(&rdev->wiphy),
715 ieee80211_debugfs_dir);
716 if (IS_ERR(rdev->wiphy.debugfsdir))
717 rdev->wiphy.debugfsdir = NULL;
718
719 cfg80211_debugfs_rdev_add(rdev);
720 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
721
722 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
723 struct regulatory_request request;
724
725 request.wiphy_idx = get_wiphy_idx(wiphy);
726 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
727 request.alpha2[0] = '9';
728 request.alpha2[1] = '9';
729
730 nl80211_send_reg_change_event(&request);
731 }
732
733 rdev->wiphy.registered = true;
734 rtnl_unlock();
735
736 res = rfkill_register(rdev->rfkill);
737 if (res) {
738 rfkill_destroy(rdev->rfkill);
739 rdev->rfkill = NULL;
740 wiphy_unregister(&rdev->wiphy);
741 return res;
742 }
743
744 return 0;
745 }
746 EXPORT_SYMBOL(wiphy_register);
747
748 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
749 {
750 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
751
752 if (!rdev->ops->rfkill_poll)
753 return;
754 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
755 rfkill_resume_polling(rdev->rfkill);
756 }
757 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
758
759 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
760 {
761 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
762
763 rfkill_pause_polling(rdev->rfkill);
764 }
765 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
766
767 void wiphy_unregister(struct wiphy *wiphy)
768 {
769 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
770
771 wait_event(rdev->dev_wait, ({
772 int __count;
773 rtnl_lock();
774 __count = rdev->opencount;
775 rtnl_unlock();
776 __count == 0; }));
777
778 if (rdev->rfkill)
779 rfkill_unregister(rdev->rfkill);
780
781 rtnl_lock();
782 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
783 rdev->wiphy.registered = false;
784
785 WARN_ON(!list_empty(&rdev->wdev_list));
786
787 /*
788 * First remove the hardware from everywhere, this makes
789 * it impossible to find from userspace.
790 */
791 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
792 list_del_rcu(&rdev->list);
793 synchronize_rcu();
794
795 /*
796 * If this device got a regulatory hint tell core its
797 * free to listen now to a new shiny device regulatory hint
798 */
799 wiphy_regulatory_deregister(wiphy);
800
801 cfg80211_rdev_list_generation++;
802 device_del(&rdev->wiphy.dev);
803
804 rtnl_unlock();
805
806 flush_work(&rdev->scan_done_wk);
807 cancel_work_sync(&rdev->conn_work);
808 flush_work(&rdev->event_work);
809 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
810 flush_work(&rdev->destroy_work);
811 flush_work(&rdev->sched_scan_stop_wk);
812 flush_work(&rdev->mlme_unreg_wk);
813
814 #ifdef CONFIG_PM
815 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
816 rdev_set_wakeup(rdev, false);
817 #endif
818 cfg80211_rdev_free_wowlan(rdev);
819 cfg80211_rdev_free_coalesce(rdev);
820 }
821 EXPORT_SYMBOL(wiphy_unregister);
822
823 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
824 {
825 struct cfg80211_internal_bss *scan, *tmp;
826 struct cfg80211_beacon_registration *reg, *treg;
827 rfkill_destroy(rdev->rfkill);
828 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
829 list_del(&reg->list);
830 kfree(reg);
831 }
832 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
833 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
834 kfree(rdev);
835 }
836
837 void wiphy_free(struct wiphy *wiphy)
838 {
839 put_device(&wiphy->dev);
840 }
841 EXPORT_SYMBOL(wiphy_free);
842
843 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
844 {
845 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
846
847 if (rfkill_set_hw_state(rdev->rfkill, blocked))
848 schedule_work(&rdev->rfkill_sync);
849 }
850 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
851
852 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
853 {
854 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
855
856 ASSERT_RTNL();
857
858 if (WARN_ON(wdev->netdev))
859 return;
860
861 list_del_rcu(&wdev->list);
862 rdev->devlist_generation++;
863
864 switch (wdev->iftype) {
865 case NL80211_IFTYPE_P2P_DEVICE:
866 cfg80211_mlme_purge_registrations(wdev);
867 cfg80211_stop_p2p_device(rdev, wdev);
868 break;
869 default:
870 WARN_ON_ONCE(1);
871 break;
872 }
873 }
874 EXPORT_SYMBOL(cfg80211_unregister_wdev);
875
876 static const struct device_type wiphy_type = {
877 .name = "wlan",
878 };
879
880 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
881 enum nl80211_iftype iftype, int num)
882 {
883 ASSERT_RTNL();
884
885 rdev->num_running_ifaces += num;
886 if (iftype == NL80211_IFTYPE_MONITOR)
887 rdev->num_running_monitor_ifaces += num;
888 }
889
890 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
891 struct wireless_dev *wdev)
892 {
893 struct net_device *dev = wdev->netdev;
894 struct cfg80211_sched_scan_request *sched_scan_req;
895
896 ASSERT_RTNL();
897 ASSERT_WDEV_LOCK(wdev);
898
899 switch (wdev->iftype) {
900 case NL80211_IFTYPE_ADHOC:
901 __cfg80211_leave_ibss(rdev, dev, true);
902 break;
903 case NL80211_IFTYPE_P2P_CLIENT:
904 case NL80211_IFTYPE_STATION:
905 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
906 if (sched_scan_req && dev == sched_scan_req->dev)
907 __cfg80211_stop_sched_scan(rdev, false);
908
909 #ifdef CONFIG_CFG80211_WEXT
910 kfree(wdev->wext.ie);
911 wdev->wext.ie = NULL;
912 wdev->wext.ie_len = 0;
913 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
914 #endif
915 cfg80211_disconnect(rdev, dev,
916 WLAN_REASON_DEAUTH_LEAVING, true);
917 break;
918 case NL80211_IFTYPE_MESH_POINT:
919 __cfg80211_leave_mesh(rdev, dev);
920 break;
921 case NL80211_IFTYPE_AP:
922 case NL80211_IFTYPE_P2P_GO:
923 __cfg80211_stop_ap(rdev, dev, true);
924 break;
925 case NL80211_IFTYPE_OCB:
926 __cfg80211_leave_ocb(rdev, dev);
927 break;
928 case NL80211_IFTYPE_WDS:
929 /* must be handled by mac80211/driver, has no APIs */
930 break;
931 case NL80211_IFTYPE_P2P_DEVICE:
932 /* cannot happen, has no netdev */
933 break;
934 case NL80211_IFTYPE_AP_VLAN:
935 case NL80211_IFTYPE_MONITOR:
936 /* nothing to do */
937 break;
938 case NL80211_IFTYPE_UNSPECIFIED:
939 case NUM_NL80211_IFTYPES:
940 /* invalid */
941 break;
942 }
943 }
944
945 void cfg80211_leave(struct cfg80211_registered_device *rdev,
946 struct wireless_dev *wdev)
947 {
948 wdev_lock(wdev);
949 __cfg80211_leave(rdev, wdev);
950 wdev_unlock(wdev);
951 }
952
953 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
954 gfp_t gfp)
955 {
956 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
957 struct cfg80211_event *ev;
958 unsigned long flags;
959
960 trace_cfg80211_stop_iface(wiphy, wdev);
961
962 ev = kzalloc(sizeof(*ev), gfp);
963 if (!ev)
964 return;
965
966 ev->type = EVENT_STOPPED;
967
968 spin_lock_irqsave(&wdev->event_lock, flags);
969 list_add_tail(&ev->list, &wdev->event_list);
970 spin_unlock_irqrestore(&wdev->event_lock, flags);
971 queue_work(cfg80211_wq, &rdev->event_work);
972 }
973 EXPORT_SYMBOL(cfg80211_stop_iface);
974
975 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
976 unsigned long state, void *ptr)
977 {
978 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
979 struct wireless_dev *wdev = dev->ieee80211_ptr;
980 struct cfg80211_registered_device *rdev;
981 struct cfg80211_sched_scan_request *sched_scan_req;
982
983 if (!wdev)
984 return NOTIFY_DONE;
985
986 rdev = wiphy_to_rdev(wdev->wiphy);
987
988 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
989
990 switch (state) {
991 case NETDEV_POST_INIT:
992 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
993 break;
994 case NETDEV_REGISTER:
995 /*
996 * NB: cannot take rdev->mtx here because this may be
997 * called within code protected by it when interfaces
998 * are added with nl80211.
999 */
1000 mutex_init(&wdev->mtx);
1001 INIT_LIST_HEAD(&wdev->event_list);
1002 spin_lock_init(&wdev->event_lock);
1003 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1004 spin_lock_init(&wdev->mgmt_registrations_lock);
1005
1006 wdev->identifier = ++rdev->wdev_id;
1007 list_add_rcu(&wdev->list, &rdev->wdev_list);
1008 rdev->devlist_generation++;
1009 /* can only change netns with wiphy */
1010 dev->features |= NETIF_F_NETNS_LOCAL;
1011
1012 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1013 "phy80211")) {
1014 pr_err("failed to add phy80211 symlink to netdev!\n");
1015 }
1016 wdev->netdev = dev;
1017 #ifdef CONFIG_CFG80211_WEXT
1018 wdev->wext.default_key = -1;
1019 wdev->wext.default_mgmt_key = -1;
1020 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1021 #endif
1022
1023 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1024 wdev->ps = true;
1025 else
1026 wdev->ps = false;
1027 /* allow mac80211 to determine the timeout */
1028 wdev->ps_timeout = -1;
1029
1030 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1031 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1032 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1033 dev->priv_flags |= IFF_DONT_BRIDGE;
1034 break;
1035 case NETDEV_GOING_DOWN:
1036 cfg80211_leave(rdev, wdev);
1037 break;
1038 case NETDEV_DOWN:
1039 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1040 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1041 if (WARN_ON(!rdev->scan_req->notified))
1042 rdev->scan_req->aborted = true;
1043 ___cfg80211_scan_done(rdev, false);
1044 }
1045
1046 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1047 if (WARN_ON(sched_scan_req &&
1048 sched_scan_req->dev == wdev->netdev)) {
1049 __cfg80211_stop_sched_scan(rdev, false);
1050 }
1051
1052 rdev->opencount--;
1053 wake_up(&rdev->dev_wait);
1054 break;
1055 case NETDEV_UP:
1056 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1057 wdev_lock(wdev);
1058 switch (wdev->iftype) {
1059 #ifdef CONFIG_CFG80211_WEXT
1060 case NL80211_IFTYPE_ADHOC:
1061 cfg80211_ibss_wext_join(rdev, wdev);
1062 break;
1063 case NL80211_IFTYPE_STATION:
1064 cfg80211_mgd_wext_connect(rdev, wdev);
1065 break;
1066 #endif
1067 #ifdef CONFIG_MAC80211_MESH
1068 case NL80211_IFTYPE_MESH_POINT:
1069 {
1070 /* backward compat code... */
1071 struct mesh_setup setup;
1072 memcpy(&setup, &default_mesh_setup,
1073 sizeof(setup));
1074 /* back compat only needed for mesh_id */
1075 setup.mesh_id = wdev->ssid;
1076 setup.mesh_id_len = wdev->mesh_id_up_len;
1077 if (wdev->mesh_id_up_len)
1078 __cfg80211_join_mesh(rdev, dev,
1079 &setup,
1080 &default_mesh_config);
1081 break;
1082 }
1083 #endif
1084 default:
1085 break;
1086 }
1087 wdev_unlock(wdev);
1088 rdev->opencount++;
1089
1090 /*
1091 * Configure power management to the driver here so that its
1092 * correctly set also after interface type changes etc.
1093 */
1094 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1095 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1096 rdev->ops->set_power_mgmt)
1097 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1098 wdev->ps_timeout)) {
1099 /* assume this means it's off */
1100 wdev->ps = false;
1101 }
1102 break;
1103 case NETDEV_UNREGISTER:
1104 /*
1105 * It is possible to get NETDEV_UNREGISTER
1106 * multiple times. To detect that, check
1107 * that the interface is still on the list
1108 * of registered interfaces, and only then
1109 * remove and clean it up.
1110 */
1111 if (!list_empty(&wdev->list)) {
1112 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1113 list_del_rcu(&wdev->list);
1114 rdev->devlist_generation++;
1115 cfg80211_mlme_purge_registrations(wdev);
1116 #ifdef CONFIG_CFG80211_WEXT
1117 kzfree(wdev->wext.keys);
1118 #endif
1119 }
1120 /*
1121 * synchronise (so that we won't find this netdev
1122 * from other code any more) and then clear the list
1123 * head so that the above code can safely check for
1124 * !list_empty() to avoid double-cleanup.
1125 */
1126 synchronize_rcu();
1127 INIT_LIST_HEAD(&wdev->list);
1128 /*
1129 * Ensure that all events have been processed and
1130 * freed.
1131 */
1132 cfg80211_process_wdev_events(wdev);
1133
1134 if (WARN_ON(wdev->current_bss)) {
1135 cfg80211_unhold_bss(wdev->current_bss);
1136 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1137 wdev->current_bss = NULL;
1138 }
1139 break;
1140 case NETDEV_PRE_UP:
1141 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1142 return notifier_from_errno(-EOPNOTSUPP);
1143 if (rfkill_blocked(rdev->rfkill))
1144 return notifier_from_errno(-ERFKILL);
1145 break;
1146 default:
1147 return NOTIFY_DONE;
1148 }
1149
1150 wireless_nlevent_flush();
1151
1152 return NOTIFY_OK;
1153 }
1154
1155 static struct notifier_block cfg80211_netdev_notifier = {
1156 .notifier_call = cfg80211_netdev_notifier_call,
1157 };
1158
1159 static void __net_exit cfg80211_pernet_exit(struct net *net)
1160 {
1161 struct cfg80211_registered_device *rdev;
1162
1163 rtnl_lock();
1164 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1165 if (net_eq(wiphy_net(&rdev->wiphy), net))
1166 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1167 }
1168 rtnl_unlock();
1169 }
1170
1171 static struct pernet_operations cfg80211_pernet_ops = {
1172 .exit = cfg80211_pernet_exit,
1173 };
1174
1175 static int __init cfg80211_init(void)
1176 {
1177 int err;
1178
1179 err = register_pernet_device(&cfg80211_pernet_ops);
1180 if (err)
1181 goto out_fail_pernet;
1182
1183 err = wiphy_sysfs_init();
1184 if (err)
1185 goto out_fail_sysfs;
1186
1187 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1188 if (err)
1189 goto out_fail_notifier;
1190
1191 err = nl80211_init();
1192 if (err)
1193 goto out_fail_nl80211;
1194
1195 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1196
1197 err = regulatory_init();
1198 if (err)
1199 goto out_fail_reg;
1200
1201 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1202 if (!cfg80211_wq) {
1203 err = -ENOMEM;
1204 goto out_fail_wq;
1205 }
1206
1207 return 0;
1208
1209 out_fail_wq:
1210 regulatory_exit();
1211 out_fail_reg:
1212 debugfs_remove(ieee80211_debugfs_dir);
1213 nl80211_exit();
1214 out_fail_nl80211:
1215 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1216 out_fail_notifier:
1217 wiphy_sysfs_exit();
1218 out_fail_sysfs:
1219 unregister_pernet_device(&cfg80211_pernet_ops);
1220 out_fail_pernet:
1221 return err;
1222 }
1223 subsys_initcall(cfg80211_init);
1224
1225 static void __exit cfg80211_exit(void)
1226 {
1227 debugfs_remove(ieee80211_debugfs_dir);
1228 nl80211_exit();
1229 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1230 wiphy_sysfs_exit();
1231 regulatory_exit();
1232 unregister_pernet_device(&cfg80211_pernet_ops);
1233 destroy_workqueue(cfg80211_wq);
1234 }
1235 module_exit(cfg80211_exit);