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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / net / wireless / core.c
blob9f1c4aa851efdf55ab81044b10ef58b7bd73ecf6
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 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
356 WARN_ON(ops->start_ap && !ops->stop_ap);
357 WARN_ON(ops->join_ocb && !ops->leave_ocb);
358 WARN_ON(ops->suspend && !ops->resume);
359 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
360 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
361 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
362 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
363 WARN_ON(ops->set_tx_power && !ops->get_tx_power);
364 WARN_ON(ops->set_antenna && !ops->get_antenna);
365
366 alloc_size = sizeof(*rdev) + sizeof_priv;
367
368 rdev = kzalloc(alloc_size, GFP_KERNEL);
369 if (!rdev)
370 return NULL;
371
372 rdev->ops = ops;
373
374 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
375
376 if (unlikely(rdev->wiphy_idx < 0)) {
377 /* ugh, wrapped! */
378 atomic_dec(&wiphy_counter);
379 kfree(rdev);
380 return NULL;
381 }
382
383 /* atomic_inc_return makes it start at 1, make it start at 0 */
384 rdev->wiphy_idx--;
385
386 /* give it a proper name */
387 if (requested_name && requested_name[0]) {
388 int rv;
389
390 rtnl_lock();
391 rv = cfg80211_dev_check_name(rdev, requested_name);
392
393 if (rv < 0) {
394 rtnl_unlock();
395 goto use_default_name;
396 }
397
398 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
399 rtnl_unlock();
400 if (rv)
401 goto use_default_name;
402 } else {
403 use_default_name:
404 /* NOTE: This is *probably* safe w/out holding rtnl because of
405 * the restrictions on phy names. Probably this call could
406 * fail if some other part of the kernel (re)named a device
407 * phyX. But, might should add some locking and check return
408 * value, and use a different name if this one exists?
409 */
410 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
411 }
412
413 INIT_LIST_HEAD(&rdev->wdev_list);
414 INIT_LIST_HEAD(&rdev->beacon_registrations);
415 spin_lock_init(&rdev->beacon_registrations_lock);
416 spin_lock_init(&rdev->bss_lock);
417 INIT_LIST_HEAD(&rdev->bss_list);
418 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
419 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
420 INIT_LIST_HEAD(&rdev->mlme_unreg);
421 spin_lock_init(&rdev->mlme_unreg_lock);
422 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
423 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
424 cfg80211_dfs_channels_update_work);
425 #ifdef CONFIG_CFG80211_WEXT
426 rdev->wiphy.wext = &cfg80211_wext_handler;
427 #endif
428
429 device_initialize(&rdev->wiphy.dev);
430 rdev->wiphy.dev.class = &ieee80211_class;
431 rdev->wiphy.dev.platform_data = rdev;
432 device_enable_async_suspend(&rdev->wiphy.dev);
433
434 INIT_LIST_HEAD(&rdev->destroy_list);
435 spin_lock_init(&rdev->destroy_list_lock);
436 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
437 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
438
439 #ifdef CONFIG_CFG80211_DEFAULT_PS
440 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
441 #endif
442
443 wiphy_net_set(&rdev->wiphy, &init_net);
444
445 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
446 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
447 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
448 &rdev->rfkill_ops, rdev);
449
450 if (!rdev->rfkill) {
451 kfree(rdev);
452 return NULL;
453 }
454
455 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
456 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
457 INIT_WORK(&rdev->event_work, cfg80211_event_work);
458
459 init_waitqueue_head(&rdev->dev_wait);
460
461 /*
462 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
463 * Fragmentation and RTS threshold are disabled by default with the
464 * special -1 value.
465 */
466 rdev->wiphy.retry_short = 7;
467 rdev->wiphy.retry_long = 4;
468 rdev->wiphy.frag_threshold = (u32) -1;
469 rdev->wiphy.rts_threshold = (u32) -1;
470 rdev->wiphy.coverage_class = 0;
471
472 rdev->wiphy.max_num_csa_counters = 1;
473
474 rdev->wiphy.max_sched_scan_plans = 1;
475 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
476
477 return &rdev->wiphy;
478 }
479 EXPORT_SYMBOL(wiphy_new_nm);
480
481 static int wiphy_verify_combinations(struct wiphy *wiphy)
482 {
483 const struct ieee80211_iface_combination *c;
484 int i, j;
485
486 for (i = 0; i < wiphy->n_iface_combinations; i++) {
487 u32 cnt = 0;
488 u16 all_iftypes = 0;
489
490 c = &wiphy->iface_combinations[i];
491
492 /*
493 * Combinations with just one interface aren't real,
494 * however we make an exception for DFS.
495 */
496 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
497 return -EINVAL;
498
499 /* Need at least one channel */
500 if (WARN_ON(!c->num_different_channels))
501 return -EINVAL;
502
503 /*
504 * Put a sane limit on maximum number of different
505 * channels to simplify channel accounting code.
506 */
507 if (WARN_ON(c->num_different_channels >
508 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
509 return -EINVAL;
510
511 /* DFS only works on one channel. */
512 if (WARN_ON(c->radar_detect_widths &&
513 (c->num_different_channels > 1)))
514 return -EINVAL;
515
516 if (WARN_ON(!c->n_limits))
517 return -EINVAL;
518
519 for (j = 0; j < c->n_limits; j++) {
520 u16 types = c->limits[j].types;
521
522 /* interface types shouldn't overlap */
523 if (WARN_ON(types & all_iftypes))
524 return -EINVAL;
525 all_iftypes |= types;
526
527 if (WARN_ON(!c->limits[j].max))
528 return -EINVAL;
529
530 /* Shouldn't list software iftypes in combinations! */
531 if (WARN_ON(wiphy->software_iftypes & types))
532 return -EINVAL;
533
534 /* Only a single P2P_DEVICE can be allowed */
535 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
536 c->limits[j].max > 1))
537 return -EINVAL;
538
539 cnt += c->limits[j].max;
540 /*
541 * Don't advertise an unsupported type
542 * in a combination.
543 */
544 if (WARN_ON((wiphy->interface_modes & types) != types))
545 return -EINVAL;
546 }
547
548 /* You can't even choose that many! */
549 if (WARN_ON(cnt < c->max_interfaces))
550 return -EINVAL;
551 }
552
553 return 0;
554 }
555
556 int wiphy_register(struct wiphy *wiphy)
557 {
558 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
559 int res;
560 enum ieee80211_band band;
561 struct ieee80211_supported_band *sband;
562 bool have_band = false;
563 int i;
564 u16 ifmodes = wiphy->interface_modes;
565
566 #ifdef CONFIG_PM
567 if (WARN_ON(wiphy->wowlan &&
568 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
569 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
570 return -EINVAL;
571 if (WARN_ON(wiphy->wowlan &&
572 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
573 !wiphy->wowlan->tcp))
574 return -EINVAL;
575 #endif
576 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
577 (!rdev->ops->tdls_channel_switch ||
578 !rdev->ops->tdls_cancel_channel_switch)))
579 return -EINVAL;
580
581 /*
582 * if a wiphy has unsupported modes for regulatory channel enforcement,
583 * opt-out of enforcement checking
584 */
585 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
586 BIT(NL80211_IFTYPE_P2P_CLIENT) |
587 BIT(NL80211_IFTYPE_AP) |
588 BIT(NL80211_IFTYPE_P2P_GO) |
589 BIT(NL80211_IFTYPE_ADHOC) |
590 BIT(NL80211_IFTYPE_P2P_DEVICE) |
591 BIT(NL80211_IFTYPE_AP_VLAN) |
592 BIT(NL80211_IFTYPE_MONITOR)))
593 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
594
595 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
596 (wiphy->regulatory_flags &
597 (REGULATORY_CUSTOM_REG |
598 REGULATORY_STRICT_REG |
599 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
600 REGULATORY_COUNTRY_IE_IGNORE))))
601 return -EINVAL;
602
603 if (WARN_ON(wiphy->coalesce &&
604 (!wiphy->coalesce->n_rules ||
605 !wiphy->coalesce->n_patterns) &&
606 (!wiphy->coalesce->pattern_min_len ||
607 wiphy->coalesce->pattern_min_len >
608 wiphy->coalesce->pattern_max_len)))
609 return -EINVAL;
610
611 if (WARN_ON(wiphy->ap_sme_capa &&
612 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
613 return -EINVAL;
614
615 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
616 return -EINVAL;
617
618 if (WARN_ON(wiphy->addresses &&
619 !is_zero_ether_addr(wiphy->perm_addr) &&
620 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
621 ETH_ALEN)))
622 return -EINVAL;
623
624 if (WARN_ON(wiphy->max_acl_mac_addrs &&
625 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
626 !rdev->ops->set_mac_acl)))
627 return -EINVAL;
628
629 if (wiphy->addresses)
630 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
631
632 /* sanity check ifmodes */
633 WARN_ON(!ifmodes);
634 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
635 if (WARN_ON(ifmodes != wiphy->interface_modes))
636 wiphy->interface_modes = ifmodes;
637
638 res = wiphy_verify_combinations(wiphy);
639 if (res)
640 return res;
641
642 /* sanity check supported bands/channels */
643 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
644 sband = wiphy->bands[band];
645 if (!sband)
646 continue;
647
648 sband->band = band;
649 if (WARN_ON(!sband->n_channels))
650 return -EINVAL;
651 /*
652 * on 60GHz band, there are no legacy rates, so
653 * n_bitrates is 0
654 */
655 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
656 !sband->n_bitrates))
657 return -EINVAL;
658
659 /*
660 * Since cfg80211_disable_40mhz_24ghz is global, we can
661 * modify the sband's ht data even if the driver uses a
662 * global structure for that.
663 */
664 if (cfg80211_disable_40mhz_24ghz &&
665 band == IEEE80211_BAND_2GHZ &&
666 sband->ht_cap.ht_supported) {
667 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
668 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
669 }
670
671 /*
672 * Since we use a u32 for rate bitmaps in
673 * ieee80211_get_response_rate, we cannot
674 * have more than 32 legacy rates.
675 */
676 if (WARN_ON(sband->n_bitrates > 32))
677 return -EINVAL;
678
679 for (i = 0; i < sband->n_channels; i++) {
680 sband->channels[i].orig_flags =
681 sband->channels[i].flags;
682 sband->channels[i].orig_mag = INT_MAX;
683 sband->channels[i].orig_mpwr =
684 sband->channels[i].max_power;
685 sband->channels[i].band = band;
686 }
687
688 have_band = true;
689 }
690
691 if (!have_band) {
692 WARN_ON(1);
693 return -EINVAL;
694 }
695
696 #ifdef CONFIG_PM
697 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
698 (!rdev->wiphy.wowlan->pattern_min_len ||
699 rdev->wiphy.wowlan->pattern_min_len >
700 rdev->wiphy.wowlan->pattern_max_len)))
701 return -EINVAL;
702 #endif
703
704 /* check and set up bitrates */
705 ieee80211_set_bitrate_flags(wiphy);
706
707 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
708
709 rtnl_lock();
710 res = device_add(&rdev->wiphy.dev);
711 if (res) {
712 rtnl_unlock();
713 return res;
714 }
715
716 /* set up regulatory info */
717 wiphy_regulatory_register(wiphy);
718
719 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
720 cfg80211_rdev_list_generation++;
721
722 /* add to debugfs */
723 rdev->wiphy.debugfsdir =
724 debugfs_create_dir(wiphy_name(&rdev->wiphy),
725 ieee80211_debugfs_dir);
726 if (IS_ERR(rdev->wiphy.debugfsdir))
727 rdev->wiphy.debugfsdir = NULL;
728
729 cfg80211_debugfs_rdev_add(rdev);
730 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
731
732 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
733 struct regulatory_request request;
734
735 request.wiphy_idx = get_wiphy_idx(wiphy);
736 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
737 request.alpha2[0] = '9';
738 request.alpha2[1] = '9';
739
740 nl80211_send_reg_change_event(&request);
741 }
742
743 rdev->wiphy.registered = true;
744 rtnl_unlock();
745
746 res = rfkill_register(rdev->rfkill);
747 if (res) {
748 rfkill_destroy(rdev->rfkill);
749 rdev->rfkill = NULL;
750 wiphy_unregister(&rdev->wiphy);
751 return res;
752 }
753
754 return 0;
755 }
756 EXPORT_SYMBOL(wiphy_register);
757
758 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
759 {
760 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
761
762 if (!rdev->ops->rfkill_poll)
763 return;
764 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
765 rfkill_resume_polling(rdev->rfkill);
766 }
767 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
768
769 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
770 {
771 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
772
773 rfkill_pause_polling(rdev->rfkill);
774 }
775 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
776
777 void wiphy_unregister(struct wiphy *wiphy)
778 {
779 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
780
781 wait_event(rdev->dev_wait, ({
782 int __count;
783 rtnl_lock();
784 __count = rdev->opencount;
785 rtnl_unlock();
786 __count == 0; }));
787
788 if (rdev->rfkill)
789 rfkill_unregister(rdev->rfkill);
790
791 rtnl_lock();
792 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
793 rdev->wiphy.registered = false;
794
795 WARN_ON(!list_empty(&rdev->wdev_list));
796
797 /*
798 * First remove the hardware from everywhere, this makes
799 * it impossible to find from userspace.
800 */
801 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
802 list_del_rcu(&rdev->list);
803 synchronize_rcu();
804
805 /*
806 * If this device got a regulatory hint tell core its
807 * free to listen now to a new shiny device regulatory hint
808 */
809 wiphy_regulatory_deregister(wiphy);
810
811 cfg80211_rdev_list_generation++;
812 device_del(&rdev->wiphy.dev);
813
814 rtnl_unlock();
815
816 flush_work(&rdev->scan_done_wk);
817 cancel_work_sync(&rdev->conn_work);
818 flush_work(&rdev->event_work);
819 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
820 flush_work(&rdev->destroy_work);
821 flush_work(&rdev->sched_scan_stop_wk);
822 flush_work(&rdev->mlme_unreg_wk);
823
824 #ifdef CONFIG_PM
825 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
826 rdev_set_wakeup(rdev, false);
827 #endif
828 cfg80211_rdev_free_wowlan(rdev);
829 cfg80211_rdev_free_coalesce(rdev);
830 }
831 EXPORT_SYMBOL(wiphy_unregister);
832
833 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
834 {
835 struct cfg80211_internal_bss *scan, *tmp;
836 struct cfg80211_beacon_registration *reg, *treg;
837 rfkill_destroy(rdev->rfkill);
838 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
839 list_del(&reg->list);
840 kfree(reg);
841 }
842 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
843 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
844 kfree(rdev);
845 }
846
847 void wiphy_free(struct wiphy *wiphy)
848 {
849 put_device(&wiphy->dev);
850 }
851 EXPORT_SYMBOL(wiphy_free);
852
853 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
854 {
855 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
856
857 if (rfkill_set_hw_state(rdev->rfkill, blocked))
858 schedule_work(&rdev->rfkill_sync);
859 }
860 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
861
862 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
863 {
864 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
865
866 ASSERT_RTNL();
867
868 if (WARN_ON(wdev->netdev))
869 return;
870
871 list_del_rcu(&wdev->list);
872 rdev->devlist_generation++;
873
874 switch (wdev->iftype) {
875 case NL80211_IFTYPE_P2P_DEVICE:
876 cfg80211_mlme_purge_registrations(wdev);
877 cfg80211_stop_p2p_device(rdev, wdev);
878 break;
879 default:
880 WARN_ON_ONCE(1);
881 break;
882 }
883 }
884 EXPORT_SYMBOL(cfg80211_unregister_wdev);
885
886 static const struct device_type wiphy_type = {
887 .name = "wlan",
888 };
889
890 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
891 enum nl80211_iftype iftype, int num)
892 {
893 ASSERT_RTNL();
894
895 rdev->num_running_ifaces += num;
896 if (iftype == NL80211_IFTYPE_MONITOR)
897 rdev->num_running_monitor_ifaces += num;
898 }
899
900 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
901 struct wireless_dev *wdev)
902 {
903 struct net_device *dev = wdev->netdev;
904 struct cfg80211_sched_scan_request *sched_scan_req;
905
906 ASSERT_RTNL();
907 ASSERT_WDEV_LOCK(wdev);
908
909 switch (wdev->iftype) {
910 case NL80211_IFTYPE_ADHOC:
911 __cfg80211_leave_ibss(rdev, dev, true);
912 break;
913 case NL80211_IFTYPE_P2P_CLIENT:
914 case NL80211_IFTYPE_STATION:
915 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
916 if (sched_scan_req && dev == sched_scan_req->dev)
917 __cfg80211_stop_sched_scan(rdev, false);
918
919 #ifdef CONFIG_CFG80211_WEXT
920 kfree(wdev->wext.ie);
921 wdev->wext.ie = NULL;
922 wdev->wext.ie_len = 0;
923 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
924 #endif
925 cfg80211_disconnect(rdev, dev,
926 WLAN_REASON_DEAUTH_LEAVING, true);
927 break;
928 case NL80211_IFTYPE_MESH_POINT:
929 __cfg80211_leave_mesh(rdev, dev);
930 break;
931 case NL80211_IFTYPE_AP:
932 case NL80211_IFTYPE_P2P_GO:
933 __cfg80211_stop_ap(rdev, dev, true);
934 break;
935 case NL80211_IFTYPE_OCB:
936 __cfg80211_leave_ocb(rdev, dev);
937 break;
938 case NL80211_IFTYPE_WDS:
939 /* must be handled by mac80211/driver, has no APIs */
940 break;
941 case NL80211_IFTYPE_P2P_DEVICE:
942 /* cannot happen, has no netdev */
943 break;
944 case NL80211_IFTYPE_AP_VLAN:
945 case NL80211_IFTYPE_MONITOR:
946 /* nothing to do */
947 break;
948 case NL80211_IFTYPE_UNSPECIFIED:
949 case NUM_NL80211_IFTYPES:
950 /* invalid */
951 break;
952 }
953 }
954
955 void cfg80211_leave(struct cfg80211_registered_device *rdev,
956 struct wireless_dev *wdev)
957 {
958 wdev_lock(wdev);
959 __cfg80211_leave(rdev, wdev);
960 wdev_unlock(wdev);
961 }
962
963 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
964 gfp_t gfp)
965 {
966 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
967 struct cfg80211_event *ev;
968 unsigned long flags;
969
970 trace_cfg80211_stop_iface(wiphy, wdev);
971
972 ev = kzalloc(sizeof(*ev), gfp);
973 if (!ev)
974 return;
975
976 ev->type = EVENT_STOPPED;
977
978 spin_lock_irqsave(&wdev->event_lock, flags);
979 list_add_tail(&ev->list, &wdev->event_list);
980 spin_unlock_irqrestore(&wdev->event_lock, flags);
981 queue_work(cfg80211_wq, &rdev->event_work);
982 }
983 EXPORT_SYMBOL(cfg80211_stop_iface);
984
985 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
986 unsigned long state, void *ptr)
987 {
988 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
989 struct wireless_dev *wdev = dev->ieee80211_ptr;
990 struct cfg80211_registered_device *rdev;
991 struct cfg80211_sched_scan_request *sched_scan_req;
992
993 if (!wdev)
994 return NOTIFY_DONE;
995
996 rdev = wiphy_to_rdev(wdev->wiphy);
997
998 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
999
1000 switch (state) {
1001 case NETDEV_POST_INIT:
1002 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1003 break;
1004 case NETDEV_REGISTER:
1005 /*
1006 * NB: cannot take rdev->mtx here because this may be
1007 * called within code protected by it when interfaces
1008 * are added with nl80211.
1009 */
1010 mutex_init(&wdev->mtx);
1011 INIT_LIST_HEAD(&wdev->event_list);
1012 spin_lock_init(&wdev->event_lock);
1013 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1014 spin_lock_init(&wdev->mgmt_registrations_lock);
1015
1016 wdev->identifier = ++rdev->wdev_id;
1017 list_add_rcu(&wdev->list, &rdev->wdev_list);
1018 rdev->devlist_generation++;
1019 /* can only change netns with wiphy */
1020 dev->features |= NETIF_F_NETNS_LOCAL;
1021
1022 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1023 "phy80211")) {
1024 pr_err("failed to add phy80211 symlink to netdev!\n");
1025 }
1026 wdev->netdev = dev;
1027 #ifdef CONFIG_CFG80211_WEXT
1028 wdev->wext.default_key = -1;
1029 wdev->wext.default_mgmt_key = -1;
1030 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1031 #endif
1032
1033 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1034 wdev->ps = true;
1035 else
1036 wdev->ps = false;
1037 /* allow mac80211 to determine the timeout */
1038 wdev->ps_timeout = -1;
1039
1040 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1041 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1042 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1043 dev->priv_flags |= IFF_DONT_BRIDGE;
1044 break;
1045 case NETDEV_GOING_DOWN:
1046 cfg80211_leave(rdev, wdev);
1047 break;
1048 case NETDEV_DOWN:
1049 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1050 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1051 if (WARN_ON(!rdev->scan_req->notified))
1052 rdev->scan_req->aborted = true;
1053 ___cfg80211_scan_done(rdev, false);
1054 }
1055
1056 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1057 if (WARN_ON(sched_scan_req &&
1058 sched_scan_req->dev == wdev->netdev)) {
1059 __cfg80211_stop_sched_scan(rdev, false);
1060 }
1061
1062 rdev->opencount--;
1063 wake_up(&rdev->dev_wait);
1064 break;
1065 case NETDEV_UP:
1066 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1067 wdev_lock(wdev);
1068 switch (wdev->iftype) {
1069 #ifdef CONFIG_CFG80211_WEXT
1070 case NL80211_IFTYPE_ADHOC:
1071 cfg80211_ibss_wext_join(rdev, wdev);
1072 break;
1073 case NL80211_IFTYPE_STATION:
1074 cfg80211_mgd_wext_connect(rdev, wdev);
1075 break;
1076 #endif
1077 #ifdef CONFIG_MAC80211_MESH
1078 case NL80211_IFTYPE_MESH_POINT:
1079 {
1080 /* backward compat code... */
1081 struct mesh_setup setup;
1082 memcpy(&setup, &default_mesh_setup,
1083 sizeof(setup));
1084 /* back compat only needed for mesh_id */
1085 setup.mesh_id = wdev->ssid;
1086 setup.mesh_id_len = wdev->mesh_id_up_len;
1087 if (wdev->mesh_id_up_len)
1088 __cfg80211_join_mesh(rdev, dev,
1089 &setup,
1090 &default_mesh_config);
1091 break;
1092 }
1093 #endif
1094 default:
1095 break;
1096 }
1097 wdev_unlock(wdev);
1098 rdev->opencount++;
1099
1100 /*
1101 * Configure power management to the driver here so that its
1102 * correctly set also after interface type changes etc.
1103 */
1104 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1105 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1106 rdev->ops->set_power_mgmt)
1107 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1108 wdev->ps_timeout)) {
1109 /* assume this means it's off */
1110 wdev->ps = false;
1111 }
1112 break;
1113 case NETDEV_UNREGISTER:
1114 /*
1115 * It is possible to get NETDEV_UNREGISTER
1116 * multiple times. To detect that, check
1117 * that the interface is still on the list
1118 * of registered interfaces, and only then
1119 * remove and clean it up.
1120 */
1121 if (!list_empty(&wdev->list)) {
1122 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1123 list_del_rcu(&wdev->list);
1124 rdev->devlist_generation++;
1125 cfg80211_mlme_purge_registrations(wdev);
1126 #ifdef CONFIG_CFG80211_WEXT
1127 kzfree(wdev->wext.keys);
1128 #endif
1129 }
1130 /*
1131 * synchronise (so that we won't find this netdev
1132 * from other code any more) and then clear the list
1133 * head so that the above code can safely check for
1134 * !list_empty() to avoid double-cleanup.
1135 */
1136 synchronize_rcu();
1137 INIT_LIST_HEAD(&wdev->list);
1138 /*
1139 * Ensure that all events have been processed and
1140 * freed.
1141 */
1142 cfg80211_process_wdev_events(wdev);
1143
1144 if (WARN_ON(wdev->current_bss)) {
1145 cfg80211_unhold_bss(wdev->current_bss);
1146 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1147 wdev->current_bss = NULL;
1148 }
1149 break;
1150 case NETDEV_PRE_UP:
1151 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1152 return notifier_from_errno(-EOPNOTSUPP);
1153 if (rfkill_blocked(rdev->rfkill))
1154 return notifier_from_errno(-ERFKILL);
1155 break;
1156 default:
1157 return NOTIFY_DONE;
1158 }
1159
1160 wireless_nlevent_flush();
1161
1162 return NOTIFY_OK;
1163 }
1164
1165 static struct notifier_block cfg80211_netdev_notifier = {
1166 .notifier_call = cfg80211_netdev_notifier_call,
1167 };
1168
1169 static void __net_exit cfg80211_pernet_exit(struct net *net)
1170 {
1171 struct cfg80211_registered_device *rdev;
1172
1173 rtnl_lock();
1174 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1175 if (net_eq(wiphy_net(&rdev->wiphy), net))
1176 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1177 }
1178 rtnl_unlock();
1179 }
1180
1181 static struct pernet_operations cfg80211_pernet_ops = {
1182 .exit = cfg80211_pernet_exit,
1183 };
1184
1185 static int __init cfg80211_init(void)
1186 {
1187 int err;
1188
1189 err = register_pernet_device(&cfg80211_pernet_ops);
1190 if (err)
1191 goto out_fail_pernet;
1192
1193 err = wiphy_sysfs_init();
1194 if (err)
1195 goto out_fail_sysfs;
1196
1197 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1198 if (err)
1199 goto out_fail_notifier;
1200
1201 err = nl80211_init();
1202 if (err)
1203 goto out_fail_nl80211;
1204
1205 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1206
1207 err = regulatory_init();
1208 if (err)
1209 goto out_fail_reg;
1210
1211 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1212 if (!cfg80211_wq) {
1213 err = -ENOMEM;
1214 goto out_fail_wq;
1215 }
1216
1217 return 0;
1218
1219 out_fail_wq:
1220 regulatory_exit();
1221 out_fail_reg:
1222 debugfs_remove(ieee80211_debugfs_dir);
1223 nl80211_exit();
1224 out_fail_nl80211:
1225 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1226 out_fail_notifier:
1227 wiphy_sysfs_exit();
1228 out_fail_sysfs:
1229 unregister_pernet_device(&cfg80211_pernet_ops);
1230 out_fail_pernet:
1231 return err;
1232 }
1233 subsys_initcall(cfg80211_init);
1234
1235 static void __exit cfg80211_exit(void)
1236 {
1237 debugfs_remove(ieee80211_debugfs_dir);
1238 nl80211_exit();
1239 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1240 wiphy_sysfs_exit();
1241 regulatory_exit();
1242 unregister_pernet_device(&cfg80211_pernet_ops);
1243 destroy_workqueue(cfg80211_wq);
1244 }
1245 module_exit(cfg80211_exit);
Linux with added FPC-III support