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staging: rtl8712: rtl8712_recv: Remove useless intialisation
[linux-2.6/btrfs-unstable.git] / net / wireless / core.c
blob3893409dee95b3ba23c39b369a57c48c6e838d9b
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
423 INIT_LIST_HEAD(&rdev->destroy_list);
424 spin_lock_init(&rdev->destroy_list_lock);
425 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
426 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
427
428 #ifdef CONFIG_CFG80211_DEFAULT_PS
429 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
430 #endif
431
432 wiphy_net_set(&rdev->wiphy, &init_net);
433
434 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
435 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
436 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
437 &rdev->rfkill_ops, rdev);
438
439 if (!rdev->rfkill) {
440 kfree(rdev);
441 return NULL;
442 }
443
444 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
445 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
446 INIT_WORK(&rdev->event_work, cfg80211_event_work);
447
448 init_waitqueue_head(&rdev->dev_wait);
449
450 /*
451 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
452 * Fragmentation and RTS threshold are disabled by default with the
453 * special -1 value.
454 */
455 rdev->wiphy.retry_short = 7;
456 rdev->wiphy.retry_long = 4;
457 rdev->wiphy.frag_threshold = (u32) -1;
458 rdev->wiphy.rts_threshold = (u32) -1;
459 rdev->wiphy.coverage_class = 0;
460
461 rdev->wiphy.max_num_csa_counters = 1;
462
463 return &rdev->wiphy;
464 }
465 EXPORT_SYMBOL(wiphy_new_nm);
466
467 static int wiphy_verify_combinations(struct wiphy *wiphy)
468 {
469 const struct ieee80211_iface_combination *c;
470 int i, j;
471
472 for (i = 0; i < wiphy->n_iface_combinations; i++) {
473 u32 cnt = 0;
474 u16 all_iftypes = 0;
475
476 c = &wiphy->iface_combinations[i];
477
478 /*
479 * Combinations with just one interface aren't real,
480 * however we make an exception for DFS.
481 */
482 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
483 return -EINVAL;
484
485 /* Need at least one channel */
486 if (WARN_ON(!c->num_different_channels))
487 return -EINVAL;
488
489 /*
490 * Put a sane limit on maximum number of different
491 * channels to simplify channel accounting code.
492 */
493 if (WARN_ON(c->num_different_channels >
494 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
495 return -EINVAL;
496
497 /* DFS only works on one channel. */
498 if (WARN_ON(c->radar_detect_widths &&
499 (c->num_different_channels > 1)))
500 return -EINVAL;
501
502 if (WARN_ON(!c->n_limits))
503 return -EINVAL;
504
505 for (j = 0; j < c->n_limits; j++) {
506 u16 types = c->limits[j].types;
507
508 /* interface types shouldn't overlap */
509 if (WARN_ON(types & all_iftypes))
510 return -EINVAL;
511 all_iftypes |= types;
512
513 if (WARN_ON(!c->limits[j].max))
514 return -EINVAL;
515
516 /* Shouldn't list software iftypes in combinations! */
517 if (WARN_ON(wiphy->software_iftypes & types))
518 return -EINVAL;
519
520 /* Only a single P2P_DEVICE can be allowed */
521 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
522 c->limits[j].max > 1))
523 return -EINVAL;
524
525 cnt += c->limits[j].max;
526 /*
527 * Don't advertise an unsupported type
528 * in a combination.
529 */
530 if (WARN_ON((wiphy->interface_modes & types) != types))
531 return -EINVAL;
532 }
533
534 /* You can't even choose that many! */
535 if (WARN_ON(cnt < c->max_interfaces))
536 return -EINVAL;
537 }
538
539 return 0;
540 }
541
542 int wiphy_register(struct wiphy *wiphy)
543 {
544 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
545 int res;
546 enum ieee80211_band band;
547 struct ieee80211_supported_band *sband;
548 bool have_band = false;
549 int i;
550 u16 ifmodes = wiphy->interface_modes;
551
552 #ifdef CONFIG_PM
553 if (WARN_ON(wiphy->wowlan &&
554 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
555 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
556 return -EINVAL;
557 if (WARN_ON(wiphy->wowlan &&
558 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
559 !wiphy->wowlan->tcp))
560 return -EINVAL;
561 #endif
562 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
563 (!rdev->ops->tdls_channel_switch ||
564 !rdev->ops->tdls_cancel_channel_switch)))
565 return -EINVAL;
566
567 /*
568 * if a wiphy has unsupported modes for regulatory channel enforcement,
569 * opt-out of enforcement checking
570 */
571 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
572 BIT(NL80211_IFTYPE_P2P_CLIENT) |
573 BIT(NL80211_IFTYPE_AP) |
574 BIT(NL80211_IFTYPE_P2P_GO) |
575 BIT(NL80211_IFTYPE_ADHOC) |
576 BIT(NL80211_IFTYPE_P2P_DEVICE) |
577 BIT(NL80211_IFTYPE_AP_VLAN) |
578 BIT(NL80211_IFTYPE_MONITOR)))
579 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
580
581 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
582 (wiphy->regulatory_flags &
583 (REGULATORY_CUSTOM_REG |
584 REGULATORY_STRICT_REG |
585 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
586 REGULATORY_COUNTRY_IE_IGNORE))))
587 return -EINVAL;
588
589 if (WARN_ON(wiphy->coalesce &&
590 (!wiphy->coalesce->n_rules ||
591 !wiphy->coalesce->n_patterns) &&
592 (!wiphy->coalesce->pattern_min_len ||
593 wiphy->coalesce->pattern_min_len >
594 wiphy->coalesce->pattern_max_len)))
595 return -EINVAL;
596
597 if (WARN_ON(wiphy->ap_sme_capa &&
598 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
599 return -EINVAL;
600
601 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
602 return -EINVAL;
603
604 if (WARN_ON(wiphy->addresses &&
605 !is_zero_ether_addr(wiphy->perm_addr) &&
606 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
607 ETH_ALEN)))
608 return -EINVAL;
609
610 if (WARN_ON(wiphy->max_acl_mac_addrs &&
611 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
612 !rdev->ops->set_mac_acl)))
613 return -EINVAL;
614
615 if (wiphy->addresses)
616 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
617
618 /* sanity check ifmodes */
619 WARN_ON(!ifmodes);
620 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
621 if (WARN_ON(ifmodes != wiphy->interface_modes))
622 wiphy->interface_modes = ifmodes;
623
624 res = wiphy_verify_combinations(wiphy);
625 if (res)
626 return res;
627
628 /* sanity check supported bands/channels */
629 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
630 sband = wiphy->bands[band];
631 if (!sband)
632 continue;
633
634 sband->band = band;
635 if (WARN_ON(!sband->n_channels))
636 return -EINVAL;
637 /*
638 * on 60gHz band, there are no legacy rates, so
639 * n_bitrates is 0
640 */
641 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
642 !sband->n_bitrates))
643 return -EINVAL;
644
645 /*
646 * Since cfg80211_disable_40mhz_24ghz is global, we can
647 * modify the sband's ht data even if the driver uses a
648 * global structure for that.
649 */
650 if (cfg80211_disable_40mhz_24ghz &&
651 band == IEEE80211_BAND_2GHZ &&
652 sband->ht_cap.ht_supported) {
653 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
654 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
655 }
656
657 /*
658 * Since we use a u32 for rate bitmaps in
659 * ieee80211_get_response_rate, we cannot
660 * have more than 32 legacy rates.
661 */
662 if (WARN_ON(sband->n_bitrates > 32))
663 return -EINVAL;
664
665 for (i = 0; i < sband->n_channels; i++) {
666 sband->channels[i].orig_flags =
667 sband->channels[i].flags;
668 sband->channels[i].orig_mag = INT_MAX;
669 sband->channels[i].orig_mpwr =
670 sband->channels[i].max_power;
671 sband->channels[i].band = band;
672 }
673
674 have_band = true;
675 }
676
677 if (!have_band) {
678 WARN_ON(1);
679 return -EINVAL;
680 }
681
682 #ifdef CONFIG_PM
683 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
684 (!rdev->wiphy.wowlan->pattern_min_len ||
685 rdev->wiphy.wowlan->pattern_min_len >
686 rdev->wiphy.wowlan->pattern_max_len)))
687 return -EINVAL;
688 #endif
689
690 /* check and set up bitrates */
691 ieee80211_set_bitrate_flags(wiphy);
692
693 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
694
695 rtnl_lock();
696 res = device_add(&rdev->wiphy.dev);
697 if (res) {
698 rtnl_unlock();
699 return res;
700 }
701
702 /* set up regulatory info */
703 wiphy_regulatory_register(wiphy);
704
705 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
706 cfg80211_rdev_list_generation++;
707
708 /* add to debugfs */
709 rdev->wiphy.debugfsdir =
710 debugfs_create_dir(wiphy_name(&rdev->wiphy),
711 ieee80211_debugfs_dir);
712 if (IS_ERR(rdev->wiphy.debugfsdir))
713 rdev->wiphy.debugfsdir = NULL;
714
715 cfg80211_debugfs_rdev_add(rdev);
716 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
717
718 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
719 struct regulatory_request request;
720
721 request.wiphy_idx = get_wiphy_idx(wiphy);
722 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
723 request.alpha2[0] = '9';
724 request.alpha2[1] = '9';
725
726 nl80211_send_reg_change_event(&request);
727 }
728
729 rdev->wiphy.registered = true;
730 rtnl_unlock();
731
732 res = rfkill_register(rdev->rfkill);
733 if (res) {
734 rfkill_destroy(rdev->rfkill);
735 rdev->rfkill = NULL;
736 wiphy_unregister(&rdev->wiphy);
737 return res;
738 }
739
740 return 0;
741 }
742 EXPORT_SYMBOL(wiphy_register);
743
744 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
745 {
746 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
747
748 if (!rdev->ops->rfkill_poll)
749 return;
750 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
751 rfkill_resume_polling(rdev->rfkill);
752 }
753 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
754
755 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
756 {
757 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
758
759 rfkill_pause_polling(rdev->rfkill);
760 }
761 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
762
763 void wiphy_unregister(struct wiphy *wiphy)
764 {
765 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
766
767 wait_event(rdev->dev_wait, ({
768 int __count;
769 rtnl_lock();
770 __count = rdev->opencount;
771 rtnl_unlock();
772 __count == 0; }));
773
774 if (rdev->rfkill)
775 rfkill_unregister(rdev->rfkill);
776
777 rtnl_lock();
778 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
779 rdev->wiphy.registered = false;
780
781 WARN_ON(!list_empty(&rdev->wdev_list));
782
783 /*
784 * First remove the hardware from everywhere, this makes
785 * it impossible to find from userspace.
786 */
787 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
788 list_del_rcu(&rdev->list);
789 synchronize_rcu();
790
791 /*
792 * If this device got a regulatory hint tell core its
793 * free to listen now to a new shiny device regulatory hint
794 */
795 wiphy_regulatory_deregister(wiphy);
796
797 cfg80211_rdev_list_generation++;
798 device_del(&rdev->wiphy.dev);
799
800 rtnl_unlock();
801
802 flush_work(&rdev->scan_done_wk);
803 cancel_work_sync(&rdev->conn_work);
804 flush_work(&rdev->event_work);
805 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
806 flush_work(&rdev->destroy_work);
807 flush_work(&rdev->sched_scan_stop_wk);
808 flush_work(&rdev->mlme_unreg_wk);
809
810 #ifdef CONFIG_PM
811 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
812 rdev_set_wakeup(rdev, false);
813 #endif
814 cfg80211_rdev_free_wowlan(rdev);
815 cfg80211_rdev_free_coalesce(rdev);
816 }
817 EXPORT_SYMBOL(wiphy_unregister);
818
819 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
820 {
821 struct cfg80211_internal_bss *scan, *tmp;
822 struct cfg80211_beacon_registration *reg, *treg;
823 rfkill_destroy(rdev->rfkill);
824 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
825 list_del(&reg->list);
826 kfree(reg);
827 }
828 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
829 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
830 kfree(rdev);
831 }
832
833 void wiphy_free(struct wiphy *wiphy)
834 {
835 put_device(&wiphy->dev);
836 }
837 EXPORT_SYMBOL(wiphy_free);
838
839 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
840 {
841 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
842
843 if (rfkill_set_hw_state(rdev->rfkill, blocked))
844 schedule_work(&rdev->rfkill_sync);
845 }
846 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
847
848 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
849 {
850 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
851
852 ASSERT_RTNL();
853
854 if (WARN_ON(wdev->netdev))
855 return;
856
857 list_del_rcu(&wdev->list);
858 rdev->devlist_generation++;
859
860 switch (wdev->iftype) {
861 case NL80211_IFTYPE_P2P_DEVICE:
862 cfg80211_mlme_purge_registrations(wdev);
863 cfg80211_stop_p2p_device(rdev, wdev);
864 break;
865 default:
866 WARN_ON_ONCE(1);
867 break;
868 }
869 }
870 EXPORT_SYMBOL(cfg80211_unregister_wdev);
871
872 static const struct device_type wiphy_type = {
873 .name = "wlan",
874 };
875
876 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
877 enum nl80211_iftype iftype, int num)
878 {
879 ASSERT_RTNL();
880
881 rdev->num_running_ifaces += num;
882 if (iftype == NL80211_IFTYPE_MONITOR)
883 rdev->num_running_monitor_ifaces += num;
884 }
885
886 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
887 struct wireless_dev *wdev)
888 {
889 struct net_device *dev = wdev->netdev;
890 struct cfg80211_sched_scan_request *sched_scan_req;
891
892 ASSERT_RTNL();
893 ASSERT_WDEV_LOCK(wdev);
894
895 switch (wdev->iftype) {
896 case NL80211_IFTYPE_ADHOC:
897 __cfg80211_leave_ibss(rdev, dev, true);
898 break;
899 case NL80211_IFTYPE_P2P_CLIENT:
900 case NL80211_IFTYPE_STATION:
901 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
902 if (sched_scan_req && dev == sched_scan_req->dev)
903 __cfg80211_stop_sched_scan(rdev, false);
904
905 #ifdef CONFIG_CFG80211_WEXT
906 kfree(wdev->wext.ie);
907 wdev->wext.ie = NULL;
908 wdev->wext.ie_len = 0;
909 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
910 #endif
911 cfg80211_disconnect(rdev, dev,
912 WLAN_REASON_DEAUTH_LEAVING, true);
913 break;
914 case NL80211_IFTYPE_MESH_POINT:
915 __cfg80211_leave_mesh(rdev, dev);
916 break;
917 case NL80211_IFTYPE_AP:
918 case NL80211_IFTYPE_P2P_GO:
919 __cfg80211_stop_ap(rdev, dev, true);
920 break;
921 case NL80211_IFTYPE_OCB:
922 __cfg80211_leave_ocb(rdev, dev);
923 break;
924 case NL80211_IFTYPE_WDS:
925 /* must be handled by mac80211/driver, has no APIs */
926 break;
927 case NL80211_IFTYPE_P2P_DEVICE:
928 /* cannot happen, has no netdev */
929 break;
930 case NL80211_IFTYPE_AP_VLAN:
931 case NL80211_IFTYPE_MONITOR:
932 /* nothing to do */
933 break;
934 case NL80211_IFTYPE_UNSPECIFIED:
935 case NUM_NL80211_IFTYPES:
936 /* invalid */
937 break;
938 }
939 }
940
941 void cfg80211_leave(struct cfg80211_registered_device *rdev,
942 struct wireless_dev *wdev)
943 {
944 wdev_lock(wdev);
945 __cfg80211_leave(rdev, wdev);
946 wdev_unlock(wdev);
947 }
948
949 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
950 gfp_t gfp)
951 {
952 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
953 struct cfg80211_event *ev;
954 unsigned long flags;
955
956 trace_cfg80211_stop_iface(wiphy, wdev);
957
958 ev = kzalloc(sizeof(*ev), gfp);
959 if (!ev)
960 return;
961
962 ev->type = EVENT_STOPPED;
963
964 spin_lock_irqsave(&wdev->event_lock, flags);
965 list_add_tail(&ev->list, &wdev->event_list);
966 spin_unlock_irqrestore(&wdev->event_lock, flags);
967 queue_work(cfg80211_wq, &rdev->event_work);
968 }
969 EXPORT_SYMBOL(cfg80211_stop_iface);
970
971 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
972 unsigned long state, void *ptr)
973 {
974 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
975 struct wireless_dev *wdev = dev->ieee80211_ptr;
976 struct cfg80211_registered_device *rdev;
977 struct cfg80211_sched_scan_request *sched_scan_req;
978
979 if (!wdev)
980 return NOTIFY_DONE;
981
982 rdev = wiphy_to_rdev(wdev->wiphy);
983
984 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
985
986 switch (state) {
987 case NETDEV_POST_INIT:
988 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
989 break;
990 case NETDEV_REGISTER:
991 /*
992 * NB: cannot take rdev->mtx here because this may be
993 * called within code protected by it when interfaces
994 * are added with nl80211.
995 */
996 mutex_init(&wdev->mtx);
997 INIT_LIST_HEAD(&wdev->event_list);
998 spin_lock_init(&wdev->event_lock);
999 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1000 spin_lock_init(&wdev->mgmt_registrations_lock);
1001
1002 wdev->identifier = ++rdev->wdev_id;
1003 list_add_rcu(&wdev->list, &rdev->wdev_list);
1004 rdev->devlist_generation++;
1005 /* can only change netns with wiphy */
1006 dev->features |= NETIF_F_NETNS_LOCAL;
1007
1008 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1009 "phy80211")) {
1010 pr_err("failed to add phy80211 symlink to netdev!\n");
1011 }
1012 wdev->netdev = dev;
1013 #ifdef CONFIG_CFG80211_WEXT
1014 wdev->wext.default_key = -1;
1015 wdev->wext.default_mgmt_key = -1;
1016 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1017 #endif
1018
1019 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1020 wdev->ps = true;
1021 else
1022 wdev->ps = false;
1023 /* allow mac80211 to determine the timeout */
1024 wdev->ps_timeout = -1;
1025
1026 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1027 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1028 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1029 dev->priv_flags |= IFF_DONT_BRIDGE;
1030 break;
1031 case NETDEV_GOING_DOWN:
1032 cfg80211_leave(rdev, wdev);
1033 break;
1034 case NETDEV_DOWN:
1035 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1036 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1037 if (WARN_ON(!rdev->scan_req->notified))
1038 rdev->scan_req->aborted = true;
1039 ___cfg80211_scan_done(rdev, false);
1040 }
1041
1042 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1043 if (WARN_ON(sched_scan_req &&
1044 sched_scan_req->dev == wdev->netdev)) {
1045 __cfg80211_stop_sched_scan(rdev, false);
1046 }
1047
1048 rdev->opencount--;
1049 wake_up(&rdev->dev_wait);
1050 break;
1051 case NETDEV_UP:
1052 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1053 wdev_lock(wdev);
1054 switch (wdev->iftype) {
1055 #ifdef CONFIG_CFG80211_WEXT
1056 case NL80211_IFTYPE_ADHOC:
1057 cfg80211_ibss_wext_join(rdev, wdev);
1058 break;
1059 case NL80211_IFTYPE_STATION:
1060 cfg80211_mgd_wext_connect(rdev, wdev);
1061 break;
1062 #endif
1063 #ifdef CONFIG_MAC80211_MESH
1064 case NL80211_IFTYPE_MESH_POINT:
1065 {
1066 /* backward compat code... */
1067 struct mesh_setup setup;
1068 memcpy(&setup, &default_mesh_setup,
1069 sizeof(setup));
1070 /* back compat only needed for mesh_id */
1071 setup.mesh_id = wdev->ssid;
1072 setup.mesh_id_len = wdev->mesh_id_up_len;
1073 if (wdev->mesh_id_up_len)
1074 __cfg80211_join_mesh(rdev, dev,
1075 &setup,
1076 &default_mesh_config);
1077 break;
1078 }
1079 #endif
1080 default:
1081 break;
1082 }
1083 wdev_unlock(wdev);
1084 rdev->opencount++;
1085
1086 /*
1087 * Configure power management to the driver here so that its
1088 * correctly set also after interface type changes etc.
1089 */
1090 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1091 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1092 rdev->ops->set_power_mgmt)
1093 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1094 wdev->ps_timeout)) {
1095 /* assume this means it's off */
1096 wdev->ps = false;
1097 }
1098 break;
1099 case NETDEV_UNREGISTER:
1100 /*
1101 * It is possible to get NETDEV_UNREGISTER
1102 * multiple times. To detect that, check
1103 * that the interface is still on the list
1104 * of registered interfaces, and only then
1105 * remove and clean it up.
1106 */
1107 if (!list_empty(&wdev->list)) {
1108 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1109 list_del_rcu(&wdev->list);
1110 rdev->devlist_generation++;
1111 cfg80211_mlme_purge_registrations(wdev);
1112 #ifdef CONFIG_CFG80211_WEXT
1113 kzfree(wdev->wext.keys);
1114 #endif
1115 }
1116 /*
1117 * synchronise (so that we won't find this netdev
1118 * from other code any more) and then clear the list
1119 * head so that the above code can safely check for
1120 * !list_empty() to avoid double-cleanup.
1121 */
1122 synchronize_rcu();
1123 INIT_LIST_HEAD(&wdev->list);
1124 /*
1125 * Ensure that all events have been processed and
1126 * freed.
1127 */
1128 cfg80211_process_wdev_events(wdev);
1129
1130 if (WARN_ON(wdev->current_bss)) {
1131 cfg80211_unhold_bss(wdev->current_bss);
1132 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1133 wdev->current_bss = NULL;
1134 }
1135 break;
1136 case NETDEV_PRE_UP:
1137 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1138 return notifier_from_errno(-EOPNOTSUPP);
1139 if (rfkill_blocked(rdev->rfkill))
1140 return notifier_from_errno(-ERFKILL);
1141 break;
1142 default:
1143 return NOTIFY_DONE;
1144 }
1145
1146 return NOTIFY_OK;
1147 }
1148
1149 static struct notifier_block cfg80211_netdev_notifier = {
1150 .notifier_call = cfg80211_netdev_notifier_call,
1151 };
1152
1153 static void __net_exit cfg80211_pernet_exit(struct net *net)
1154 {
1155 struct cfg80211_registered_device *rdev;
1156
1157 rtnl_lock();
1158 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1159 if (net_eq(wiphy_net(&rdev->wiphy), net))
1160 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1161 }
1162 rtnl_unlock();
1163 }
1164
1165 static struct pernet_operations cfg80211_pernet_ops = {
1166 .exit = cfg80211_pernet_exit,
1167 };
1168
1169 static int __init cfg80211_init(void)
1170 {
1171 int err;
1172
1173 err = register_pernet_device(&cfg80211_pernet_ops);
1174 if (err)
1175 goto out_fail_pernet;
1176
1177 err = wiphy_sysfs_init();
1178 if (err)
1179 goto out_fail_sysfs;
1180
1181 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1182 if (err)
1183 goto out_fail_notifier;
1184
1185 err = nl80211_init();
1186 if (err)
1187 goto out_fail_nl80211;
1188
1189 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1190
1191 err = regulatory_init();
1192 if (err)
1193 goto out_fail_reg;
1194
1195 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1196 if (!cfg80211_wq) {
1197 err = -ENOMEM;
1198 goto out_fail_wq;
1199 }
1200
1201 return 0;
1202
1203 out_fail_wq:
1204 regulatory_exit();
1205 out_fail_reg:
1206 debugfs_remove(ieee80211_debugfs_dir);
1207 nl80211_exit();
1208 out_fail_nl80211:
1209 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1210 out_fail_notifier:
1211 wiphy_sysfs_exit();
1212 out_fail_sysfs:
1213 unregister_pernet_device(&cfg80211_pernet_ops);
1214 out_fail_pernet:
1215 return err;
1216 }
1217 subsys_initcall(cfg80211_init);
1218
1219 static void __exit cfg80211_exit(void)
1220 {
1221 debugfs_remove(ieee80211_debugfs_dir);
1222 nl80211_exit();
1223 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1224 wiphy_sysfs_exit();
1225 regulatory_exit();
1226 unregister_pernet_device(&cfg80211_pernet_ops);
1227 destroy_workqueue(cfg80211_wq);
1228 }
1229 module_exit(cfg80211_exit);
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