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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / net / wireless / core.c
bloba1e909ae0f78159b4b2b1f2a9fa59e5ec8fa6e46
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 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
98 return -EINVAL;
99
100 /* prohibit calling the thing phy%d when %d is not its number */
101 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
102 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
103 /* count number of places needed to print wiphy_idx */
104 digits = 1;
105 while (wiphy_idx /= 10)
106 digits++;
107 /*
108 * deny the name if it is phy<idx> where <idx> is printed
109 * without leading zeroes. taken == strlen(newname) here
110 */
111 if (taken == strlen(PHY_NAME) + digits)
112 return -EINVAL;
113 }
114
115 /* Ensure another device does not already have this name. */
116 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
117 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
118 return -EINVAL;
119
120 return 0;
121 }
122
123 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
124 char *newname)
125 {
126 int result;
127
128 ASSERT_RTNL();
129
130 /* Ignore nop renames */
131 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
132 return 0;
133
134 result = cfg80211_dev_check_name(rdev, newname);
135 if (result < 0)
136 return result;
137
138 result = device_rename(&rdev->wiphy.dev, newname);
139 if (result)
140 return result;
141
142 if (rdev->wiphy.debugfsdir &&
143 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
144 rdev->wiphy.debugfsdir,
145 rdev->wiphy.debugfsdir->d_parent,
146 newname))
147 pr_err("failed to rename debugfs dir to %s!\n", newname);
148
149 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
150
151 return 0;
152 }
153
154 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
155 struct net *net)
156 {
157 struct wireless_dev *wdev;
158 int err = 0;
159
160 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
161 return -EOPNOTSUPP;
162
163 list_for_each_entry(wdev, &rdev->wdev_list, list) {
164 if (!wdev->netdev)
165 continue;
166 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
167 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
168 if (err)
169 break;
170 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
171 }
172
173 if (err) {
174 /* failed -- clean up to old netns */
175 net = wiphy_net(&rdev->wiphy);
176
177 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
178 list) {
179 if (!wdev->netdev)
180 continue;
181 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
182 err = dev_change_net_namespace(wdev->netdev, net,
183 "wlan%d");
184 WARN_ON(err);
185 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
186 }
187
188 return err;
189 }
190
191 wiphy_net_set(&rdev->wiphy, net);
192
193 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
194 WARN_ON(err);
195
196 return 0;
197 }
198
199 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
200 {
201 struct cfg80211_registered_device *rdev = data;
202
203 rdev_rfkill_poll(rdev);
204 }
205
206 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
207 struct wireless_dev *wdev)
208 {
209 ASSERT_RTNL();
210
211 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
212 return;
213
214 if (!wdev->p2p_started)
215 return;
216
217 rdev_stop_p2p_device(rdev, wdev);
218 wdev->p2p_started = false;
219
220 rdev->opencount--;
221
222 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
223 if (WARN_ON(!rdev->scan_req->notified))
224 rdev->scan_req->aborted = true;
225 ___cfg80211_scan_done(rdev, false);
226 }
227 }
228
229 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
230 {
231 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
232 struct wireless_dev *wdev;
233
234 ASSERT_RTNL();
235
236 list_for_each_entry(wdev, &rdev->wdev_list, list) {
237 if (wdev->netdev) {
238 dev_close(wdev->netdev);
239 continue;
240 }
241 /* otherwise, check iftype */
242 switch (wdev->iftype) {
243 case NL80211_IFTYPE_P2P_DEVICE:
244 cfg80211_stop_p2p_device(rdev, wdev);
245 break;
246 default:
247 break;
248 }
249 }
250 }
251 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
252
253 static int cfg80211_rfkill_set_block(void *data, bool blocked)
254 {
255 struct cfg80211_registered_device *rdev = data;
256
257 if (!blocked)
258 return 0;
259
260 rtnl_lock();
261 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
262 rtnl_unlock();
263
264 return 0;
265 }
266
267 static void cfg80211_rfkill_sync_work(struct work_struct *work)
268 {
269 struct cfg80211_registered_device *rdev;
270
271 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
272 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
273 }
274
275 static void cfg80211_event_work(struct work_struct *work)
276 {
277 struct cfg80211_registered_device *rdev;
278
279 rdev = container_of(work, struct cfg80211_registered_device,
280 event_work);
281
282 rtnl_lock();
283 cfg80211_process_rdev_events(rdev);
284 rtnl_unlock();
285 }
286
287 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
288 {
289 struct cfg80211_iface_destroy *item;
290
291 ASSERT_RTNL();
292
293 spin_lock_irq(&rdev->destroy_list_lock);
294 while ((item = list_first_entry_or_null(&rdev->destroy_list,
295 struct cfg80211_iface_destroy,
296 list))) {
297 struct wireless_dev *wdev, *tmp;
298 u32 nlportid = item->nlportid;
299
300 list_del(&item->list);
301 kfree(item);
302 spin_unlock_irq(&rdev->destroy_list_lock);
303
304 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
305 if (nlportid == wdev->owner_nlportid)
306 rdev_del_virtual_intf(rdev, wdev);
307 }
308
309 spin_lock_irq(&rdev->destroy_list_lock);
310 }
311 spin_unlock_irq(&rdev->destroy_list_lock);
312 }
313
314 static void cfg80211_destroy_iface_wk(struct work_struct *work)
315 {
316 struct cfg80211_registered_device *rdev;
317
318 rdev = container_of(work, struct cfg80211_registered_device,
319 destroy_work);
320
321 rtnl_lock();
322 cfg80211_destroy_ifaces(rdev);
323 rtnl_unlock();
324 }
325
326 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
327 {
328 struct cfg80211_registered_device *rdev;
329
330 rdev = container_of(work, struct cfg80211_registered_device,
331 sched_scan_stop_wk);
332
333 rtnl_lock();
334
335 __cfg80211_stop_sched_scan(rdev, false);
336
337 rtnl_unlock();
338 }
339
340 /* exported functions */
341
342 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
343 const char *requested_name)
344 {
345 static atomic_t wiphy_counter = ATOMIC_INIT(0);
346
347 struct cfg80211_registered_device *rdev;
348 int alloc_size;
349
350 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
351 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
352 WARN_ON(ops->connect && !ops->disconnect);
353 WARN_ON(ops->join_ibss && !ops->leave_ibss);
354 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
355 WARN_ON(ops->add_station && !ops->del_station);
356 WARN_ON(ops->add_mpath && !ops->del_mpath);
357 WARN_ON(ops->join_mesh && !ops->leave_mesh);
358
359 alloc_size = sizeof(*rdev) + sizeof_priv;
360
361 rdev = kzalloc(alloc_size, GFP_KERNEL);
362 if (!rdev)
363 return NULL;
364
365 rdev->ops = ops;
366
367 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
368
369 if (unlikely(rdev->wiphy_idx < 0)) {
370 /* ugh, wrapped! */
371 atomic_dec(&wiphy_counter);
372 kfree(rdev);
373 return NULL;
374 }
375
376 /* atomic_inc_return makes it start at 1, make it start at 0 */
377 rdev->wiphy_idx--;
378
379 /* give it a proper name */
380 if (requested_name && requested_name[0]) {
381 int rv;
382
383 rtnl_lock();
384 rv = cfg80211_dev_check_name(rdev, requested_name);
385
386 if (rv < 0) {
387 rtnl_unlock();
388 goto use_default_name;
389 }
390
391 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
392 rtnl_unlock();
393 if (rv)
394 goto use_default_name;
395 } else {
396 int rv;
397
398 use_default_name:
399 /* NOTE: This is *probably* safe w/out holding rtnl because of
400 * the restrictions on phy names. Probably this call could
401 * fail if some other part of the kernel (re)named a device
402 * phyX. But, might should add some locking and check return
403 * value, and use a different name if this one exists?
404 */
405 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
406 if (rv < 0) {
407 kfree(rdev);
408 return NULL;
409 }
410 }
411
412 INIT_LIST_HEAD(&rdev->wdev_list);
413 INIT_LIST_HEAD(&rdev->beacon_registrations);
414 spin_lock_init(&rdev->beacon_registrations_lock);
415 spin_lock_init(&rdev->bss_lock);
416 INIT_LIST_HEAD(&rdev->bss_list);
417 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
418 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
419 INIT_LIST_HEAD(&rdev->mlme_unreg);
420 spin_lock_init(&rdev->mlme_unreg_lock);
421 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
422 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
423 cfg80211_dfs_channels_update_work);
424 #ifdef CONFIG_CFG80211_WEXT
425 rdev->wiphy.wext = &cfg80211_wext_handler;
426 #endif
427
428 device_initialize(&rdev->wiphy.dev);
429 rdev->wiphy.dev.class = &ieee80211_class;
430 rdev->wiphy.dev.platform_data = rdev;
431 device_enable_async_suspend(&rdev->wiphy.dev);
432
433 INIT_LIST_HEAD(&rdev->destroy_list);
434 spin_lock_init(&rdev->destroy_list_lock);
435 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
436 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
437
438 #ifdef CONFIG_CFG80211_DEFAULT_PS
439 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
440 #endif
441
442 wiphy_net_set(&rdev->wiphy, &init_net);
443
444 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
445 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
446 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
447 &rdev->rfkill_ops, rdev);
448
449 if (!rdev->rfkill) {
450 kfree(rdev);
451 return NULL;
452 }
453
454 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
455 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
456 INIT_WORK(&rdev->event_work, cfg80211_event_work);
457
458 init_waitqueue_head(&rdev->dev_wait);
459
460 /*
461 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
462 * Fragmentation and RTS threshold are disabled by default with the
463 * special -1 value.
464 */
465 rdev->wiphy.retry_short = 7;
466 rdev->wiphy.retry_long = 4;
467 rdev->wiphy.frag_threshold = (u32) -1;
468 rdev->wiphy.rts_threshold = (u32) -1;
469 rdev->wiphy.coverage_class = 0;
470
471 rdev->wiphy.max_num_csa_counters = 1;
472
473 rdev->wiphy.max_sched_scan_plans = 1;
474 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
475
476 return &rdev->wiphy;
477 }
478 EXPORT_SYMBOL(wiphy_new_nm);
479
480 static int wiphy_verify_combinations(struct wiphy *wiphy)
481 {
482 const struct ieee80211_iface_combination *c;
483 int i, j;
484
485 for (i = 0; i < wiphy->n_iface_combinations; i++) {
486 u32 cnt = 0;
487 u16 all_iftypes = 0;
488
489 c = &wiphy->iface_combinations[i];
490
491 /*
492 * Combinations with just one interface aren't real,
493 * however we make an exception for DFS.
494 */
495 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
496 return -EINVAL;
497
498 /* Need at least one channel */
499 if (WARN_ON(!c->num_different_channels))
500 return -EINVAL;
501
502 /*
503 * Put a sane limit on maximum number of different
504 * channels to simplify channel accounting code.
505 */
506 if (WARN_ON(c->num_different_channels >
507 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
508 return -EINVAL;
509
510 /* DFS only works on one channel. */
511 if (WARN_ON(c->radar_detect_widths &&
512 (c->num_different_channels > 1)))
513 return -EINVAL;
514
515 if (WARN_ON(!c->n_limits))
516 return -EINVAL;
517
518 for (j = 0; j < c->n_limits; j++) {
519 u16 types = c->limits[j].types;
520
521 /* interface types shouldn't overlap */
522 if (WARN_ON(types & all_iftypes))
523 return -EINVAL;
524 all_iftypes |= types;
525
526 if (WARN_ON(!c->limits[j].max))
527 return -EINVAL;
528
529 /* Shouldn't list software iftypes in combinations! */
530 if (WARN_ON(wiphy->software_iftypes & types))
531 return -EINVAL;
532
533 /* Only a single P2P_DEVICE can be allowed */
534 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
535 c->limits[j].max > 1))
536 return -EINVAL;
537
538 cnt += c->limits[j].max;
539 /*
540 * Don't advertise an unsupported type
541 * in a combination.
542 */
543 if (WARN_ON((wiphy->interface_modes & types) != types))
544 return -EINVAL;
545 }
546
547 /* You can't even choose that many! */
548 if (WARN_ON(cnt < c->max_interfaces))
549 return -EINVAL;
550 }
551
552 return 0;
553 }
554
555 int wiphy_register(struct wiphy *wiphy)
556 {
557 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
558 int res;
559 enum ieee80211_band band;
560 struct ieee80211_supported_band *sband;
561 bool have_band = false;
562 int i;
563 u16 ifmodes = wiphy->interface_modes;
564
565 #ifdef CONFIG_PM
566 if (WARN_ON(wiphy->wowlan &&
567 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
568 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
569 return -EINVAL;
570 if (WARN_ON(wiphy->wowlan &&
571 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
572 !wiphy->wowlan->tcp))
573 return -EINVAL;
574 #endif
575 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
576 (!rdev->ops->tdls_channel_switch ||
577 !rdev->ops->tdls_cancel_channel_switch)))
578 return -EINVAL;
579
580 /*
581 * if a wiphy has unsupported modes for regulatory channel enforcement,
582 * opt-out of enforcement checking
583 */
584 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
585 BIT(NL80211_IFTYPE_P2P_CLIENT) |
586 BIT(NL80211_IFTYPE_AP) |
587 BIT(NL80211_IFTYPE_P2P_GO) |
588 BIT(NL80211_IFTYPE_ADHOC) |
589 BIT(NL80211_IFTYPE_P2P_DEVICE) |
590 BIT(NL80211_IFTYPE_AP_VLAN) |
591 BIT(NL80211_IFTYPE_MONITOR)))
592 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
593
594 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
595 (wiphy->regulatory_flags &
596 (REGULATORY_CUSTOM_REG |
597 REGULATORY_STRICT_REG |
598 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
599 REGULATORY_COUNTRY_IE_IGNORE))))
600 return -EINVAL;
601
602 if (WARN_ON(wiphy->coalesce &&
603 (!wiphy->coalesce->n_rules ||
604 !wiphy->coalesce->n_patterns) &&
605 (!wiphy->coalesce->pattern_min_len ||
606 wiphy->coalesce->pattern_min_len >
607 wiphy->coalesce->pattern_max_len)))
608 return -EINVAL;
609
610 if (WARN_ON(wiphy->ap_sme_capa &&
611 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
612 return -EINVAL;
613
614 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
615 return -EINVAL;
616
617 if (WARN_ON(wiphy->addresses &&
618 !is_zero_ether_addr(wiphy->perm_addr) &&
619 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
620 ETH_ALEN)))
621 return -EINVAL;
622
623 if (WARN_ON(wiphy->max_acl_mac_addrs &&
624 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
625 !rdev->ops->set_mac_acl)))
626 return -EINVAL;
627
628 if (wiphy->addresses)
629 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
630
631 /* sanity check ifmodes */
632 WARN_ON(!ifmodes);
633 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
634 if (WARN_ON(ifmodes != wiphy->interface_modes))
635 wiphy->interface_modes = ifmodes;
636
637 res = wiphy_verify_combinations(wiphy);
638 if (res)
639 return res;
640
641 /* sanity check supported bands/channels */
642 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
643 sband = wiphy->bands[band];
644 if (!sband)
645 continue;
646
647 sband->band = band;
648 if (WARN_ON(!sband->n_channels))
649 return -EINVAL;
650 /*
651 * on 60GHz band, there are no legacy rates, so
652 * n_bitrates is 0
653 */
654 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
655 !sband->n_bitrates))
656 return -EINVAL;
657
658 /*
659 * Since cfg80211_disable_40mhz_24ghz is global, we can
660 * modify the sband's ht data even if the driver uses a
661 * global structure for that.
662 */
663 if (cfg80211_disable_40mhz_24ghz &&
664 band == IEEE80211_BAND_2GHZ &&
665 sband->ht_cap.ht_supported) {
666 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
667 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
668 }
669
670 /*
671 * Since we use a u32 for rate bitmaps in
672 * ieee80211_get_response_rate, we cannot
673 * have more than 32 legacy rates.
674 */
675 if (WARN_ON(sband->n_bitrates > 32))
676 return -EINVAL;
677
678 for (i = 0; i < sband->n_channels; i++) {
679 sband->channels[i].orig_flags =
680 sband->channels[i].flags;
681 sband->channels[i].orig_mag = INT_MAX;
682 sband->channels[i].orig_mpwr =
683 sband->channels[i].max_power;
684 sband->channels[i].band = band;
685 }
686
687 have_band = true;
688 }
689
690 if (!have_band) {
691 WARN_ON(1);
692 return -EINVAL;
693 }
694
695 #ifdef CONFIG_PM
696 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
697 (!rdev->wiphy.wowlan->pattern_min_len ||
698 rdev->wiphy.wowlan->pattern_min_len >
699 rdev->wiphy.wowlan->pattern_max_len)))
700 return -EINVAL;
701 #endif
702
703 /* check and set up bitrates */
704 ieee80211_set_bitrate_flags(wiphy);
705
706 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
707
708 rtnl_lock();
709 res = device_add(&rdev->wiphy.dev);
710 if (res) {
711 rtnl_unlock();
712 return res;
713 }
714
715 /* set up regulatory info */
716 wiphy_regulatory_register(wiphy);
717
718 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
719 cfg80211_rdev_list_generation++;
720
721 /* add to debugfs */
722 rdev->wiphy.debugfsdir =
723 debugfs_create_dir(wiphy_name(&rdev->wiphy),
724 ieee80211_debugfs_dir);
725 if (IS_ERR(rdev->wiphy.debugfsdir))
726 rdev->wiphy.debugfsdir = NULL;
727
728 cfg80211_debugfs_rdev_add(rdev);
729 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
730
731 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
732 struct regulatory_request request;
733
734 request.wiphy_idx = get_wiphy_idx(wiphy);
735 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
736 request.alpha2[0] = '9';
737 request.alpha2[1] = '9';
738
739 nl80211_send_reg_change_event(&request);
740 }
741
742 rdev->wiphy.registered = true;
743 rtnl_unlock();
744
745 res = rfkill_register(rdev->rfkill);
746 if (res) {
747 rfkill_destroy(rdev->rfkill);
748 rdev->rfkill = NULL;
749 wiphy_unregister(&rdev->wiphy);
750 return res;
751 }
752
753 return 0;
754 }
755 EXPORT_SYMBOL(wiphy_register);
756
757 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
758 {
759 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
760
761 if (!rdev->ops->rfkill_poll)
762 return;
763 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
764 rfkill_resume_polling(rdev->rfkill);
765 }
766 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
767
768 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
769 {
770 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
771
772 rfkill_pause_polling(rdev->rfkill);
773 }
774 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
775
776 void wiphy_unregister(struct wiphy *wiphy)
777 {
778 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
779
780 wait_event(rdev->dev_wait, ({
781 int __count;
782 rtnl_lock();
783 __count = rdev->opencount;
784 rtnl_unlock();
785 __count == 0; }));
786
787 if (rdev->rfkill)
788 rfkill_unregister(rdev->rfkill);
789
790 rtnl_lock();
791 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
792 rdev->wiphy.registered = false;
793
794 WARN_ON(!list_empty(&rdev->wdev_list));
795
796 /*
797 * First remove the hardware from everywhere, this makes
798 * it impossible to find from userspace.
799 */
800 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
801 list_del_rcu(&rdev->list);
802 synchronize_rcu();
803
804 /*
805 * If this device got a regulatory hint tell core its
806 * free to listen now to a new shiny device regulatory hint
807 */
808 wiphy_regulatory_deregister(wiphy);
809
810 cfg80211_rdev_list_generation++;
811 device_del(&rdev->wiphy.dev);
812
813 rtnl_unlock();
814
815 flush_work(&rdev->scan_done_wk);
816 cancel_work_sync(&rdev->conn_work);
817 flush_work(&rdev->event_work);
818 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
819 flush_work(&rdev->destroy_work);
820 flush_work(&rdev->sched_scan_stop_wk);
821 flush_work(&rdev->mlme_unreg_wk);
822
823 #ifdef CONFIG_PM
824 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
825 rdev_set_wakeup(rdev, false);
826 #endif
827 cfg80211_rdev_free_wowlan(rdev);
828 cfg80211_rdev_free_coalesce(rdev);
829 }
830 EXPORT_SYMBOL(wiphy_unregister);
831
832 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
833 {
834 struct cfg80211_internal_bss *scan, *tmp;
835 struct cfg80211_beacon_registration *reg, *treg;
836 rfkill_destroy(rdev->rfkill);
837 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
838 list_del(&reg->list);
839 kfree(reg);
840 }
841 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
842 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
843 kfree(rdev);
844 }
845
846 void wiphy_free(struct wiphy *wiphy)
847 {
848 put_device(&wiphy->dev);
849 }
850 EXPORT_SYMBOL(wiphy_free);
851
852 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
853 {
854 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
855
856 if (rfkill_set_hw_state(rdev->rfkill, blocked))
857 schedule_work(&rdev->rfkill_sync);
858 }
859 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
860
861 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
862 {
863 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
864
865 ASSERT_RTNL();
866
867 if (WARN_ON(wdev->netdev))
868 return;
869
870 list_del_rcu(&wdev->list);
871 rdev->devlist_generation++;
872
873 switch (wdev->iftype) {
874 case NL80211_IFTYPE_P2P_DEVICE:
875 cfg80211_mlme_purge_registrations(wdev);
876 cfg80211_stop_p2p_device(rdev, wdev);
877 break;
878 default:
879 WARN_ON_ONCE(1);
880 break;
881 }
882 }
883 EXPORT_SYMBOL(cfg80211_unregister_wdev);
884
885 static const struct device_type wiphy_type = {
886 .name = "wlan",
887 };
888
889 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
890 enum nl80211_iftype iftype, int num)
891 {
892 ASSERT_RTNL();
893
894 rdev->num_running_ifaces += num;
895 if (iftype == NL80211_IFTYPE_MONITOR)
896 rdev->num_running_monitor_ifaces += num;
897 }
898
899 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
900 struct wireless_dev *wdev)
901 {
902 struct net_device *dev = wdev->netdev;
903 struct cfg80211_sched_scan_request *sched_scan_req;
904
905 ASSERT_RTNL();
906 ASSERT_WDEV_LOCK(wdev);
907
908 switch (wdev->iftype) {
909 case NL80211_IFTYPE_ADHOC:
910 __cfg80211_leave_ibss(rdev, dev, true);
911 break;
912 case NL80211_IFTYPE_P2P_CLIENT:
913 case NL80211_IFTYPE_STATION:
914 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
915 if (sched_scan_req && dev == sched_scan_req->dev)
916 __cfg80211_stop_sched_scan(rdev, false);
917
918 #ifdef CONFIG_CFG80211_WEXT
919 kfree(wdev->wext.ie);
920 wdev->wext.ie = NULL;
921 wdev->wext.ie_len = 0;
922 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
923 #endif
924 cfg80211_disconnect(rdev, dev,
925 WLAN_REASON_DEAUTH_LEAVING, true);
926 break;
927 case NL80211_IFTYPE_MESH_POINT:
928 __cfg80211_leave_mesh(rdev, dev);
929 break;
930 case NL80211_IFTYPE_AP:
931 case NL80211_IFTYPE_P2P_GO:
932 __cfg80211_stop_ap(rdev, dev, true);
933 break;
934 case NL80211_IFTYPE_OCB:
935 __cfg80211_leave_ocb(rdev, dev);
936 break;
937 case NL80211_IFTYPE_WDS:
938 /* must be handled by mac80211/driver, has no APIs */
939 break;
940 case NL80211_IFTYPE_P2P_DEVICE:
941 /* cannot happen, has no netdev */
942 break;
943 case NL80211_IFTYPE_AP_VLAN:
944 case NL80211_IFTYPE_MONITOR:
945 /* nothing to do */
946 break;
947 case NL80211_IFTYPE_UNSPECIFIED:
948 case NUM_NL80211_IFTYPES:
949 /* invalid */
950 break;
951 }
952 }
953
954 void cfg80211_leave(struct cfg80211_registered_device *rdev,
955 struct wireless_dev *wdev)
956 {
957 wdev_lock(wdev);
958 __cfg80211_leave(rdev, wdev);
959 wdev_unlock(wdev);
960 }
961
962 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
963 gfp_t gfp)
964 {
965 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
966 struct cfg80211_event *ev;
967 unsigned long flags;
968
969 trace_cfg80211_stop_iface(wiphy, wdev);
970
971 ev = kzalloc(sizeof(*ev), gfp);
972 if (!ev)
973 return;
974
975 ev->type = EVENT_STOPPED;
976
977 spin_lock_irqsave(&wdev->event_lock, flags);
978 list_add_tail(&ev->list, &wdev->event_list);
979 spin_unlock_irqrestore(&wdev->event_lock, flags);
980 queue_work(cfg80211_wq, &rdev->event_work);
981 }
982 EXPORT_SYMBOL(cfg80211_stop_iface);
983
984 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
985 unsigned long state, void *ptr)
986 {
987 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
988 struct wireless_dev *wdev = dev->ieee80211_ptr;
989 struct cfg80211_registered_device *rdev;
990 struct cfg80211_sched_scan_request *sched_scan_req;
991
992 if (!wdev)
993 return NOTIFY_DONE;
994
995 rdev = wiphy_to_rdev(wdev->wiphy);
996
997 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
998
999 switch (state) {
1000 case NETDEV_POST_INIT:
1001 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1002 break;
1003 case NETDEV_REGISTER:
1004 /*
1005 * NB: cannot take rdev->mtx here because this may be
1006 * called within code protected by it when interfaces
1007 * are added with nl80211.
1008 */
1009 mutex_init(&wdev->mtx);
1010 INIT_LIST_HEAD(&wdev->event_list);
1011 spin_lock_init(&wdev->event_lock);
1012 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1013 spin_lock_init(&wdev->mgmt_registrations_lock);
1014
1015 wdev->identifier = ++rdev->wdev_id;
1016 list_add_rcu(&wdev->list, &rdev->wdev_list);
1017 rdev->devlist_generation++;
1018 /* can only change netns with wiphy */
1019 dev->features |= NETIF_F_NETNS_LOCAL;
1020
1021 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1022 "phy80211")) {
1023 pr_err("failed to add phy80211 symlink to netdev!\n");
1024 }
1025 wdev->netdev = dev;
1026 #ifdef CONFIG_CFG80211_WEXT
1027 wdev->wext.default_key = -1;
1028 wdev->wext.default_mgmt_key = -1;
1029 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1030 #endif
1031
1032 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1033 wdev->ps = true;
1034 else
1035 wdev->ps = false;
1036 /* allow mac80211 to determine the timeout */
1037 wdev->ps_timeout = -1;
1038
1039 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1040 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1041 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1042 dev->priv_flags |= IFF_DONT_BRIDGE;
1043 break;
1044 case NETDEV_GOING_DOWN:
1045 cfg80211_leave(rdev, wdev);
1046 break;
1047 case NETDEV_DOWN:
1048 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1049 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1050 if (WARN_ON(!rdev->scan_req->notified))
1051 rdev->scan_req->aborted = true;
1052 ___cfg80211_scan_done(rdev, false);
1053 }
1054
1055 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1056 if (WARN_ON(sched_scan_req &&
1057 sched_scan_req->dev == wdev->netdev)) {
1058 __cfg80211_stop_sched_scan(rdev, false);
1059 }
1060
1061 rdev->opencount--;
1062 wake_up(&rdev->dev_wait);
1063 break;
1064 case NETDEV_UP:
1065 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1066 wdev_lock(wdev);
1067 switch (wdev->iftype) {
1068 #ifdef CONFIG_CFG80211_WEXT
1069 case NL80211_IFTYPE_ADHOC:
1070 cfg80211_ibss_wext_join(rdev, wdev);
1071 break;
1072 case NL80211_IFTYPE_STATION:
1073 cfg80211_mgd_wext_connect(rdev, wdev);
1074 break;
1075 #endif
1076 #ifdef CONFIG_MAC80211_MESH
1077 case NL80211_IFTYPE_MESH_POINT:
1078 {
1079 /* backward compat code... */
1080 struct mesh_setup setup;
1081 memcpy(&setup, &default_mesh_setup,
1082 sizeof(setup));
1083 /* back compat only needed for mesh_id */
1084 setup.mesh_id = wdev->ssid;
1085 setup.mesh_id_len = wdev->mesh_id_up_len;
1086 if (wdev->mesh_id_up_len)
1087 __cfg80211_join_mesh(rdev, dev,
1088 &setup,
1089 &default_mesh_config);
1090 break;
1091 }
1092 #endif
1093 default:
1094 break;
1095 }
1096 wdev_unlock(wdev);
1097 rdev->opencount++;
1098
1099 /*
1100 * Configure power management to the driver here so that its
1101 * correctly set also after interface type changes etc.
1102 */
1103 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1104 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1105 rdev->ops->set_power_mgmt)
1106 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1107 wdev->ps_timeout)) {
1108 /* assume this means it's off */
1109 wdev->ps = false;
1110 }
1111 break;
1112 case NETDEV_UNREGISTER:
1113 /*
1114 * It is possible to get NETDEV_UNREGISTER
1115 * multiple times. To detect that, check
1116 * that the interface is still on the list
1117 * of registered interfaces, and only then
1118 * remove and clean it up.
1119 */
1120 if (!list_empty(&wdev->list)) {
1121 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1122 list_del_rcu(&wdev->list);
1123 rdev->devlist_generation++;
1124 cfg80211_mlme_purge_registrations(wdev);
1125 #ifdef CONFIG_CFG80211_WEXT
1126 kzfree(wdev->wext.keys);
1127 #endif
1128 }
1129 /*
1130 * synchronise (so that we won't find this netdev
1131 * from other code any more) and then clear the list
1132 * head so that the above code can safely check for
1133 * !list_empty() to avoid double-cleanup.
1134 */
1135 synchronize_rcu();
1136 INIT_LIST_HEAD(&wdev->list);
1137 /*
1138 * Ensure that all events have been processed and
1139 * freed.
1140 */
1141 cfg80211_process_wdev_events(wdev);
1142
1143 if (WARN_ON(wdev->current_bss)) {
1144 cfg80211_unhold_bss(wdev->current_bss);
1145 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1146 wdev->current_bss = NULL;
1147 }
1148 break;
1149 case NETDEV_PRE_UP:
1150 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1151 return notifier_from_errno(-EOPNOTSUPP);
1152 if (rfkill_blocked(rdev->rfkill))
1153 return notifier_from_errno(-ERFKILL);
1154 break;
1155 default:
1156 return NOTIFY_DONE;
1157 }
1158
1159 wireless_nlevent_flush();
1160
1161 return NOTIFY_OK;
1162 }
1163
1164 static struct notifier_block cfg80211_netdev_notifier = {
1165 .notifier_call = cfg80211_netdev_notifier_call,
1166 };
1167
1168 static void __net_exit cfg80211_pernet_exit(struct net *net)
1169 {
1170 struct cfg80211_registered_device *rdev;
1171
1172 rtnl_lock();
1173 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1174 if (net_eq(wiphy_net(&rdev->wiphy), net))
1175 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1176 }
1177 rtnl_unlock();
1178 }
1179
1180 static struct pernet_operations cfg80211_pernet_ops = {
1181 .exit = cfg80211_pernet_exit,
1182 };
1183
1184 static int __init cfg80211_init(void)
1185 {
1186 int err;
1187
1188 err = register_pernet_device(&cfg80211_pernet_ops);
1189 if (err)
1190 goto out_fail_pernet;
1191
1192 err = wiphy_sysfs_init();
1193 if (err)
1194 goto out_fail_sysfs;
1195
1196 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1197 if (err)
1198 goto out_fail_notifier;
1199
1200 err = nl80211_init();
1201 if (err)
1202 goto out_fail_nl80211;
1203
1204 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1205
1206 err = regulatory_init();
1207 if (err)
1208 goto out_fail_reg;
1209
1210 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1211 if (!cfg80211_wq) {
1212 err = -ENOMEM;
1213 goto out_fail_wq;
1214 }
1215
1216 return 0;
1217
1218 out_fail_wq:
1219 regulatory_exit();
1220 out_fail_reg:
1221 debugfs_remove(ieee80211_debugfs_dir);
1222 nl80211_exit();
1223 out_fail_nl80211:
1224 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1225 out_fail_notifier:
1226 wiphy_sysfs_exit();
1227 out_fail_sysfs:
1228 unregister_pernet_device(&cfg80211_pernet_ops);
1229 out_fail_pernet:
1230 return err;
1231 }
1232 subsys_initcall(cfg80211_init);
1233
1234 static void __exit cfg80211_exit(void)
1235 {
1236 debugfs_remove(ieee80211_debugfs_dir);
1237 nl80211_exit();
1238 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1239 wiphy_sysfs_exit();
1240 regulatory_exit();
1241 unregister_pernet_device(&cfg80211_pernet_ops);
1242 destroy_workqueue(cfg80211_wq);
1243 }
1244 module_exit(cfg80211_exit);
Linux with added FPC-III support