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Linux 4.8-rc8
[linux/fpc-iii.git] / net / wireless / core.c
blob7645e97362c04854a488237552a517807ecea91c
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 * Copyright 2015 Intel Deutschland GmbH
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/if.h>
12 #include <linux/module.h>
13 #include <linux/err.h>
14 #include <linux/list.h>
15 #include <linux/slab.h>
16 #include <linux/nl80211.h>
17 #include <linux/debugfs.h>
18 #include <linux/notifier.h>
19 #include <linux/device.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/sched.h>
23 #include <net/genetlink.h>
24 #include <net/cfg80211.h>
25 #include "nl80211.h"
26 #include "core.h"
27 #include "sysfs.h"
28 #include "debugfs.h"
29 #include "wext-compat.h"
30 #include "rdev-ops.h"
31
32 /* name for sysfs, %d is appended */
33 #define PHY_NAME "phy"
34
35 MODULE_AUTHOR("Johannes Berg");
36 MODULE_LICENSE("GPL");
37 MODULE_DESCRIPTION("wireless configuration support");
38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
39
40 /* RCU-protected (and RTNL for writers) */
41 LIST_HEAD(cfg80211_rdev_list);
42 int cfg80211_rdev_list_generation;
43
44 /* for debugfs */
45 static struct dentry *ieee80211_debugfs_dir;
46
47 /* for the cleanup, scan and event works */
48 struct workqueue_struct *cfg80211_wq;
49
50 static bool cfg80211_disable_40mhz_24ghz;
51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
53 "Disable 40MHz support in the 2.4GHz band");
54
55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
56 {
57 struct cfg80211_registered_device *result = NULL, *rdev;
58
59 ASSERT_RTNL();
60
61 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
62 if (rdev->wiphy_idx == wiphy_idx) {
63 result = rdev;
64 break;
65 }
66 }
67
68 return result;
69 }
70
71 int get_wiphy_idx(struct wiphy *wiphy)
72 {
73 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
74
75 return rdev->wiphy_idx;
76 }
77
78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
79 {
80 struct cfg80211_registered_device *rdev;
81
82 ASSERT_RTNL();
83
84 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
85 if (!rdev)
86 return NULL;
87 return &rdev->wiphy;
88 }
89
90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
91 const char *newname)
92 {
93 struct cfg80211_registered_device *rdev2;
94 int wiphy_idx, taken = -1, digits;
95
96 ASSERT_RTNL();
97
98 /* prohibit calling the thing phy%d when %d is not its number */
99 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
100 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
101 /* count number of places needed to print wiphy_idx */
102 digits = 1;
103 while (wiphy_idx /= 10)
104 digits++;
105 /*
106 * deny the name if it is phy<idx> where <idx> is printed
107 * without leading zeroes. taken == strlen(newname) here
108 */
109 if (taken == strlen(PHY_NAME) + digits)
110 return -EINVAL;
111 }
112
113 /* Ensure another device does not already have this name. */
114 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
115 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
116 return -EINVAL;
117
118 return 0;
119 }
120
121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
122 char *newname)
123 {
124 int result;
125
126 ASSERT_RTNL();
127
128 /* Ignore nop renames */
129 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
130 return 0;
131
132 result = cfg80211_dev_check_name(rdev, newname);
133 if (result < 0)
134 return result;
135
136 result = device_rename(&rdev->wiphy.dev, newname);
137 if (result)
138 return result;
139
140 if (rdev->wiphy.debugfsdir &&
141 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
142 rdev->wiphy.debugfsdir,
143 rdev->wiphy.debugfsdir->d_parent,
144 newname))
145 pr_err("failed to rename debugfs dir to %s!\n", newname);
146
147 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
148
149 return 0;
150 }
151
152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
153 struct net *net)
154 {
155 struct wireless_dev *wdev;
156 int err = 0;
157
158 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
159 return -EOPNOTSUPP;
160
161 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
162 if (!wdev->netdev)
163 continue;
164 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
165 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
166 if (err)
167 break;
168 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
169 }
170
171 if (err) {
172 /* failed -- clean up to old netns */
173 net = wiphy_net(&rdev->wiphy);
174
175 list_for_each_entry_continue_reverse(wdev,
176 &rdev->wiphy.wdev_list,
177 list) {
178 if (!wdev->netdev)
179 continue;
180 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
181 err = dev_change_net_namespace(wdev->netdev, net,
182 "wlan%d");
183 WARN_ON(err);
184 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
185 }
186
187 return err;
188 }
189
190 wiphy_net_set(&rdev->wiphy, net);
191
192 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
193 WARN_ON(err);
194
195 return 0;
196 }
197
198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
199 {
200 struct cfg80211_registered_device *rdev = data;
201
202 rdev_rfkill_poll(rdev);
203 }
204
205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
206 struct wireless_dev *wdev)
207 {
208 ASSERT_RTNL();
209
210 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
211 return;
212
213 if (!wdev->p2p_started)
214 return;
215
216 rdev_stop_p2p_device(rdev, wdev);
217 wdev->p2p_started = false;
218
219 rdev->opencount--;
220
221 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
222 if (WARN_ON(!rdev->scan_req->notified))
223 rdev->scan_req->info.aborted = true;
224 ___cfg80211_scan_done(rdev, false);
225 }
226 }
227
228 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
229 {
230 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
231 struct wireless_dev *wdev;
232
233 ASSERT_RTNL();
234
235 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
236 if (wdev->netdev) {
237 dev_close(wdev->netdev);
238 continue;
239 }
240 /* otherwise, check iftype */
241 switch (wdev->iftype) {
242 case NL80211_IFTYPE_P2P_DEVICE:
243 cfg80211_stop_p2p_device(rdev, wdev);
244 break;
245 default:
246 break;
247 }
248 }
249 }
250 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
251
252 static int cfg80211_rfkill_set_block(void *data, bool blocked)
253 {
254 struct cfg80211_registered_device *rdev = data;
255
256 if (!blocked)
257 return 0;
258
259 rtnl_lock();
260 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
261 rtnl_unlock();
262
263 return 0;
264 }
265
266 static void cfg80211_rfkill_sync_work(struct work_struct *work)
267 {
268 struct cfg80211_registered_device *rdev;
269
270 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
271 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
272 }
273
274 static void cfg80211_event_work(struct work_struct *work)
275 {
276 struct cfg80211_registered_device *rdev;
277
278 rdev = container_of(work, struct cfg80211_registered_device,
279 event_work);
280
281 rtnl_lock();
282 cfg80211_process_rdev_events(rdev);
283 rtnl_unlock();
284 }
285
286 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
287 {
288 struct cfg80211_iface_destroy *item;
289
290 ASSERT_RTNL();
291
292 spin_lock_irq(&rdev->destroy_list_lock);
293 while ((item = list_first_entry_or_null(&rdev->destroy_list,
294 struct cfg80211_iface_destroy,
295 list))) {
296 struct wireless_dev *wdev, *tmp;
297 u32 nlportid = item->nlportid;
298
299 list_del(&item->list);
300 kfree(item);
301 spin_unlock_irq(&rdev->destroy_list_lock);
302
303 list_for_each_entry_safe(wdev, tmp,
304 &rdev->wiphy.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 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
359 WARN_ON(ops->start_ap && !ops->stop_ap);
360 WARN_ON(ops->join_ocb && !ops->leave_ocb);
361 WARN_ON(ops->suspend && !ops->resume);
362 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
363 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
364 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
365 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
366
367 alloc_size = sizeof(*rdev) + sizeof_priv;
368
369 rdev = kzalloc(alloc_size, GFP_KERNEL);
370 if (!rdev)
371 return NULL;
372
373 rdev->ops = ops;
374
375 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
376
377 if (unlikely(rdev->wiphy_idx < 0)) {
378 /* ugh, wrapped! */
379 atomic_dec(&wiphy_counter);
380 kfree(rdev);
381 return NULL;
382 }
383
384 /* atomic_inc_return makes it start at 1, make it start at 0 */
385 rdev->wiphy_idx--;
386
387 /* give it a proper name */
388 if (requested_name && requested_name[0]) {
389 int rv;
390
391 rtnl_lock();
392 rv = cfg80211_dev_check_name(rdev, requested_name);
393
394 if (rv < 0) {
395 rtnl_unlock();
396 goto use_default_name;
397 }
398
399 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
400 rtnl_unlock();
401 if (rv)
402 goto use_default_name;
403 } else {
404 use_default_name:
405 /* NOTE: This is *probably* safe w/out holding rtnl because of
406 * the restrictions on phy names. Probably this call could
407 * fail if some other part of the kernel (re)named a device
408 * phyX. But, might should add some locking and check return
409 * value, and use a different name if this one exists?
410 */
411 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
412 }
413
414 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
415 INIT_LIST_HEAD(&rdev->beacon_registrations);
416 spin_lock_init(&rdev->beacon_registrations_lock);
417 spin_lock_init(&rdev->bss_lock);
418 INIT_LIST_HEAD(&rdev->bss_list);
419 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
420 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
421 INIT_LIST_HEAD(&rdev->mlme_unreg);
422 spin_lock_init(&rdev->mlme_unreg_lock);
423 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
424 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
425 cfg80211_dfs_channels_update_work);
426 #ifdef CONFIG_CFG80211_WEXT
427 rdev->wiphy.wext = &cfg80211_wext_handler;
428 #endif
429
430 device_initialize(&rdev->wiphy.dev);
431 rdev->wiphy.dev.class = &ieee80211_class;
432 rdev->wiphy.dev.platform_data = rdev;
433 device_enable_async_suspend(&rdev->wiphy.dev);
434
435 INIT_LIST_HEAD(&rdev->destroy_list);
436 spin_lock_init(&rdev->destroy_list_lock);
437 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
438 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
439
440 #ifdef CONFIG_CFG80211_DEFAULT_PS
441 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
442 #endif
443
444 wiphy_net_set(&rdev->wiphy, &init_net);
445
446 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
447 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
448 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
449 &rdev->rfkill_ops, rdev);
450
451 if (!rdev->rfkill) {
452 kfree(rdev);
453 return NULL;
454 }
455
456 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
457 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
458 INIT_WORK(&rdev->event_work, cfg80211_event_work);
459
460 init_waitqueue_head(&rdev->dev_wait);
461
462 /*
463 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
464 * Fragmentation and RTS threshold are disabled by default with the
465 * special -1 value.
466 */
467 rdev->wiphy.retry_short = 7;
468 rdev->wiphy.retry_long = 4;
469 rdev->wiphy.frag_threshold = (u32) -1;
470 rdev->wiphy.rts_threshold = (u32) -1;
471 rdev->wiphy.coverage_class = 0;
472
473 rdev->wiphy.max_num_csa_counters = 1;
474
475 rdev->wiphy.max_sched_scan_plans = 1;
476 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
477
478 return &rdev->wiphy;
479 }
480 EXPORT_SYMBOL(wiphy_new_nm);
481
482 static int wiphy_verify_combinations(struct wiphy *wiphy)
483 {
484 const struct ieee80211_iface_combination *c;
485 int i, j;
486
487 for (i = 0; i < wiphy->n_iface_combinations; i++) {
488 u32 cnt = 0;
489 u16 all_iftypes = 0;
490
491 c = &wiphy->iface_combinations[i];
492
493 /*
494 * Combinations with just one interface aren't real,
495 * however we make an exception for DFS.
496 */
497 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
498 return -EINVAL;
499
500 /* Need at least one channel */
501 if (WARN_ON(!c->num_different_channels))
502 return -EINVAL;
503
504 /*
505 * Put a sane limit on maximum number of different
506 * channels to simplify channel accounting code.
507 */
508 if (WARN_ON(c->num_different_channels >
509 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
510 return -EINVAL;
511
512 /* DFS only works on one channel. */
513 if (WARN_ON(c->radar_detect_widths &&
514 (c->num_different_channels > 1)))
515 return -EINVAL;
516
517 if (WARN_ON(!c->n_limits))
518 return -EINVAL;
519
520 for (j = 0; j < c->n_limits; j++) {
521 u16 types = c->limits[j].types;
522
523 /* interface types shouldn't overlap */
524 if (WARN_ON(types & all_iftypes))
525 return -EINVAL;
526 all_iftypes |= types;
527
528 if (WARN_ON(!c->limits[j].max))
529 return -EINVAL;
530
531 /* Shouldn't list software iftypes in combinations! */
532 if (WARN_ON(wiphy->software_iftypes & types))
533 return -EINVAL;
534
535 /* Only a single P2P_DEVICE can be allowed */
536 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
537 c->limits[j].max > 1))
538 return -EINVAL;
539
540 cnt += c->limits[j].max;
541 /*
542 * Don't advertise an unsupported type
543 * in a combination.
544 */
545 if (WARN_ON((wiphy->interface_modes & types) != types))
546 return -EINVAL;
547 }
548
549 /* You can't even choose that many! */
550 if (WARN_ON(cnt < c->max_interfaces))
551 return -EINVAL;
552 }
553
554 return 0;
555 }
556
557 int wiphy_register(struct wiphy *wiphy)
558 {
559 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
560 int res;
561 enum nl80211_band band;
562 struct ieee80211_supported_band *sband;
563 bool have_band = false;
564 int i;
565 u16 ifmodes = wiphy->interface_modes;
566
567 #ifdef CONFIG_PM
568 if (WARN_ON(wiphy->wowlan &&
569 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
570 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
571 return -EINVAL;
572 if (WARN_ON(wiphy->wowlan &&
573 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
574 !wiphy->wowlan->tcp))
575 return -EINVAL;
576 #endif
577 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
578 (!rdev->ops->tdls_channel_switch ||
579 !rdev->ops->tdls_cancel_channel_switch)))
580 return -EINVAL;
581
582 /*
583 * if a wiphy has unsupported modes for regulatory channel enforcement,
584 * opt-out of enforcement checking
585 */
586 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
587 BIT(NL80211_IFTYPE_P2P_CLIENT) |
588 BIT(NL80211_IFTYPE_AP) |
589 BIT(NL80211_IFTYPE_P2P_GO) |
590 BIT(NL80211_IFTYPE_ADHOC) |
591 BIT(NL80211_IFTYPE_P2P_DEVICE) |
592 BIT(NL80211_IFTYPE_AP_VLAN) |
593 BIT(NL80211_IFTYPE_MONITOR)))
594 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
595
596 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
597 (wiphy->regulatory_flags &
598 (REGULATORY_CUSTOM_REG |
599 REGULATORY_STRICT_REG |
600 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
601 REGULATORY_COUNTRY_IE_IGNORE))))
602 return -EINVAL;
603
604 if (WARN_ON(wiphy->coalesce &&
605 (!wiphy->coalesce->n_rules ||
606 !wiphy->coalesce->n_patterns) &&
607 (!wiphy->coalesce->pattern_min_len ||
608 wiphy->coalesce->pattern_min_len >
609 wiphy->coalesce->pattern_max_len)))
610 return -EINVAL;
611
612 if (WARN_ON(wiphy->ap_sme_capa &&
613 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
614 return -EINVAL;
615
616 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
617 return -EINVAL;
618
619 if (WARN_ON(wiphy->addresses &&
620 !is_zero_ether_addr(wiphy->perm_addr) &&
621 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
622 ETH_ALEN)))
623 return -EINVAL;
624
625 if (WARN_ON(wiphy->max_acl_mac_addrs &&
626 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
627 !rdev->ops->set_mac_acl)))
628 return -EINVAL;
629
630 /* assure only valid behaviours are flagged by driver
631 * hence subtract 2 as bit 0 is invalid.
632 */
633 if (WARN_ON(wiphy->bss_select_support &&
634 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
635 return -EINVAL;
636
637 if (wiphy->addresses)
638 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
639
640 /* sanity check ifmodes */
641 WARN_ON(!ifmodes);
642 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
643 if (WARN_ON(ifmodes != wiphy->interface_modes))
644 wiphy->interface_modes = ifmodes;
645
646 res = wiphy_verify_combinations(wiphy);
647 if (res)
648 return res;
649
650 /* sanity check supported bands/channels */
651 for (band = 0; band < NUM_NL80211_BANDS; band++) {
652 sband = wiphy->bands[band];
653 if (!sband)
654 continue;
655
656 sband->band = band;
657 if (WARN_ON(!sband->n_channels))
658 return -EINVAL;
659 /*
660 * on 60GHz band, there are no legacy rates, so
661 * n_bitrates is 0
662 */
663 if (WARN_ON(band != NL80211_BAND_60GHZ &&
664 !sband->n_bitrates))
665 return -EINVAL;
666
667 /*
668 * Since cfg80211_disable_40mhz_24ghz is global, we can
669 * modify the sband's ht data even if the driver uses a
670 * global structure for that.
671 */
672 if (cfg80211_disable_40mhz_24ghz &&
673 band == NL80211_BAND_2GHZ &&
674 sband->ht_cap.ht_supported) {
675 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
676 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
677 }
678
679 /*
680 * Since we use a u32 for rate bitmaps in
681 * ieee80211_get_response_rate, we cannot
682 * have more than 32 legacy rates.
683 */
684 if (WARN_ON(sband->n_bitrates > 32))
685 return -EINVAL;
686
687 for (i = 0; i < sband->n_channels; i++) {
688 sband->channels[i].orig_flags =
689 sband->channels[i].flags;
690 sband->channels[i].orig_mag = INT_MAX;
691 sband->channels[i].orig_mpwr =
692 sband->channels[i].max_power;
693 sband->channels[i].band = band;
694 }
695
696 have_band = true;
697 }
698
699 if (!have_band) {
700 WARN_ON(1);
701 return -EINVAL;
702 }
703
704 #ifdef CONFIG_PM
705 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
706 (!rdev->wiphy.wowlan->pattern_min_len ||
707 rdev->wiphy.wowlan->pattern_min_len >
708 rdev->wiphy.wowlan->pattern_max_len)))
709 return -EINVAL;
710 #endif
711
712 /* check and set up bitrates */
713 ieee80211_set_bitrate_flags(wiphy);
714
715 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
716
717 rtnl_lock();
718 res = device_add(&rdev->wiphy.dev);
719 if (res) {
720 rtnl_unlock();
721 return res;
722 }
723
724 /* set up regulatory info */
725 wiphy_regulatory_register(wiphy);
726
727 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
728 cfg80211_rdev_list_generation++;
729
730 /* add to debugfs */
731 rdev->wiphy.debugfsdir =
732 debugfs_create_dir(wiphy_name(&rdev->wiphy),
733 ieee80211_debugfs_dir);
734 if (IS_ERR(rdev->wiphy.debugfsdir))
735 rdev->wiphy.debugfsdir = NULL;
736
737 cfg80211_debugfs_rdev_add(rdev);
738 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
739
740 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
741 struct regulatory_request request;
742
743 request.wiphy_idx = get_wiphy_idx(wiphy);
744 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
745 request.alpha2[0] = '9';
746 request.alpha2[1] = '9';
747
748 nl80211_send_reg_change_event(&request);
749 }
750
751 /* Check that nobody globally advertises any capabilities they do not
752 * advertise on all possible interface types.
753 */
754 if (wiphy->extended_capabilities_len &&
755 wiphy->num_iftype_ext_capab &&
756 wiphy->iftype_ext_capab) {
757 u8 supported_on_all, j;
758 const struct wiphy_iftype_ext_capab *capab;
759
760 capab = wiphy->iftype_ext_capab;
761 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
762 if (capab[0].extended_capabilities_len > j)
763 supported_on_all =
764 capab[0].extended_capabilities[j];
765 else
766 supported_on_all = 0x00;
767 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
768 if (j >= capab[i].extended_capabilities_len) {
769 supported_on_all = 0x00;
770 break;
771 }
772 supported_on_all &=
773 capab[i].extended_capabilities[j];
774 }
775 if (WARN_ON(wiphy->extended_capabilities[j] &
776 ~supported_on_all))
777 break;
778 }
779 }
780
781 rdev->wiphy.registered = true;
782 rtnl_unlock();
783
784 res = rfkill_register(rdev->rfkill);
785 if (res) {
786 rfkill_destroy(rdev->rfkill);
787 rdev->rfkill = NULL;
788 wiphy_unregister(&rdev->wiphy);
789 return res;
790 }
791
792 return 0;
793 }
794 EXPORT_SYMBOL(wiphy_register);
795
796 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
797 {
798 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
799
800 if (!rdev->ops->rfkill_poll)
801 return;
802 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
803 rfkill_resume_polling(rdev->rfkill);
804 }
805 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
806
807 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
808 {
809 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
810
811 rfkill_pause_polling(rdev->rfkill);
812 }
813 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
814
815 void wiphy_unregister(struct wiphy *wiphy)
816 {
817 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
818
819 wait_event(rdev->dev_wait, ({
820 int __count;
821 rtnl_lock();
822 __count = rdev->opencount;
823 rtnl_unlock();
824 __count == 0; }));
825
826 if (rdev->rfkill)
827 rfkill_unregister(rdev->rfkill);
828
829 rtnl_lock();
830 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
831 rdev->wiphy.registered = false;
832
833 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
834
835 /*
836 * First remove the hardware from everywhere, this makes
837 * it impossible to find from userspace.
838 */
839 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
840 list_del_rcu(&rdev->list);
841 synchronize_rcu();
842
843 /*
844 * If this device got a regulatory hint tell core its
845 * free to listen now to a new shiny device regulatory hint
846 */
847 wiphy_regulatory_deregister(wiphy);
848
849 cfg80211_rdev_list_generation++;
850 device_del(&rdev->wiphy.dev);
851
852 rtnl_unlock();
853
854 flush_work(&rdev->scan_done_wk);
855 cancel_work_sync(&rdev->conn_work);
856 flush_work(&rdev->event_work);
857 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
858 flush_work(&rdev->destroy_work);
859 flush_work(&rdev->sched_scan_stop_wk);
860 flush_work(&rdev->mlme_unreg_wk);
861
862 #ifdef CONFIG_PM
863 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
864 rdev_set_wakeup(rdev, false);
865 #endif
866 cfg80211_rdev_free_wowlan(rdev);
867 cfg80211_rdev_free_coalesce(rdev);
868 }
869 EXPORT_SYMBOL(wiphy_unregister);
870
871 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
872 {
873 struct cfg80211_internal_bss *scan, *tmp;
874 struct cfg80211_beacon_registration *reg, *treg;
875 rfkill_destroy(rdev->rfkill);
876 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
877 list_del(&reg->list);
878 kfree(reg);
879 }
880 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
881 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
882 kfree(rdev);
883 }
884
885 void wiphy_free(struct wiphy *wiphy)
886 {
887 put_device(&wiphy->dev);
888 }
889 EXPORT_SYMBOL(wiphy_free);
890
891 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
892 {
893 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
894
895 if (rfkill_set_hw_state(rdev->rfkill, blocked))
896 schedule_work(&rdev->rfkill_sync);
897 }
898 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
899
900 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
901 {
902 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
903
904 ASSERT_RTNL();
905
906 if (WARN_ON(wdev->netdev))
907 return;
908
909 list_del_rcu(&wdev->list);
910 rdev->devlist_generation++;
911
912 switch (wdev->iftype) {
913 case NL80211_IFTYPE_P2P_DEVICE:
914 cfg80211_mlme_purge_registrations(wdev);
915 cfg80211_stop_p2p_device(rdev, wdev);
916 break;
917 default:
918 WARN_ON_ONCE(1);
919 break;
920 }
921 }
922 EXPORT_SYMBOL(cfg80211_unregister_wdev);
923
924 static const struct device_type wiphy_type = {
925 .name = "wlan",
926 };
927
928 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
929 enum nl80211_iftype iftype, int num)
930 {
931 ASSERT_RTNL();
932
933 rdev->num_running_ifaces += num;
934 if (iftype == NL80211_IFTYPE_MONITOR)
935 rdev->num_running_monitor_ifaces += num;
936 }
937
938 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
939 struct wireless_dev *wdev)
940 {
941 struct net_device *dev = wdev->netdev;
942 struct cfg80211_sched_scan_request *sched_scan_req;
943
944 ASSERT_RTNL();
945 ASSERT_WDEV_LOCK(wdev);
946
947 switch (wdev->iftype) {
948 case NL80211_IFTYPE_ADHOC:
949 __cfg80211_leave_ibss(rdev, dev, true);
950 break;
951 case NL80211_IFTYPE_P2P_CLIENT:
952 case NL80211_IFTYPE_STATION:
953 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
954 if (sched_scan_req && dev == sched_scan_req->dev)
955 __cfg80211_stop_sched_scan(rdev, false);
956
957 #ifdef CONFIG_CFG80211_WEXT
958 kfree(wdev->wext.ie);
959 wdev->wext.ie = NULL;
960 wdev->wext.ie_len = 0;
961 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
962 #endif
963 cfg80211_disconnect(rdev, dev,
964 WLAN_REASON_DEAUTH_LEAVING, true);
965 break;
966 case NL80211_IFTYPE_MESH_POINT:
967 __cfg80211_leave_mesh(rdev, dev);
968 break;
969 case NL80211_IFTYPE_AP:
970 case NL80211_IFTYPE_P2P_GO:
971 __cfg80211_stop_ap(rdev, dev, true);
972 break;
973 case NL80211_IFTYPE_OCB:
974 __cfg80211_leave_ocb(rdev, dev);
975 break;
976 case NL80211_IFTYPE_WDS:
977 /* must be handled by mac80211/driver, has no APIs */
978 break;
979 case NL80211_IFTYPE_P2P_DEVICE:
980 /* cannot happen, has no netdev */
981 break;
982 case NL80211_IFTYPE_AP_VLAN:
983 case NL80211_IFTYPE_MONITOR:
984 /* nothing to do */
985 break;
986 case NL80211_IFTYPE_UNSPECIFIED:
987 case NUM_NL80211_IFTYPES:
988 /* invalid */
989 break;
990 }
991 }
992
993 void cfg80211_leave(struct cfg80211_registered_device *rdev,
994 struct wireless_dev *wdev)
995 {
996 wdev_lock(wdev);
997 __cfg80211_leave(rdev, wdev);
998 wdev_unlock(wdev);
999 }
1000
1001 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1002 gfp_t gfp)
1003 {
1004 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1005 struct cfg80211_event *ev;
1006 unsigned long flags;
1007
1008 trace_cfg80211_stop_iface(wiphy, wdev);
1009
1010 ev = kzalloc(sizeof(*ev), gfp);
1011 if (!ev)
1012 return;
1013
1014 ev->type = EVENT_STOPPED;
1015
1016 spin_lock_irqsave(&wdev->event_lock, flags);
1017 list_add_tail(&ev->list, &wdev->event_list);
1018 spin_unlock_irqrestore(&wdev->event_lock, flags);
1019 queue_work(cfg80211_wq, &rdev->event_work);
1020 }
1021 EXPORT_SYMBOL(cfg80211_stop_iface);
1022
1023 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1024 unsigned long state, void *ptr)
1025 {
1026 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1027 struct wireless_dev *wdev = dev->ieee80211_ptr;
1028 struct cfg80211_registered_device *rdev;
1029 struct cfg80211_sched_scan_request *sched_scan_req;
1030
1031 if (!wdev)
1032 return NOTIFY_DONE;
1033
1034 rdev = wiphy_to_rdev(wdev->wiphy);
1035
1036 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1037
1038 switch (state) {
1039 case NETDEV_POST_INIT:
1040 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1041 break;
1042 case NETDEV_REGISTER:
1043 /*
1044 * NB: cannot take rdev->mtx here because this may be
1045 * called within code protected by it when interfaces
1046 * are added with nl80211.
1047 */
1048 mutex_init(&wdev->mtx);
1049 INIT_LIST_HEAD(&wdev->event_list);
1050 spin_lock_init(&wdev->event_lock);
1051 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1052 spin_lock_init(&wdev->mgmt_registrations_lock);
1053
1054 wdev->identifier = ++rdev->wdev_id;
1055 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1056 rdev->devlist_generation++;
1057 /* can only change netns with wiphy */
1058 dev->features |= NETIF_F_NETNS_LOCAL;
1059
1060 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1061 "phy80211")) {
1062 pr_err("failed to add phy80211 symlink to netdev!\n");
1063 }
1064 wdev->netdev = dev;
1065 #ifdef CONFIG_CFG80211_WEXT
1066 wdev->wext.default_key = -1;
1067 wdev->wext.default_mgmt_key = -1;
1068 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1069 #endif
1070
1071 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1072 wdev->ps = true;
1073 else
1074 wdev->ps = false;
1075 /* allow mac80211 to determine the timeout */
1076 wdev->ps_timeout = -1;
1077
1078 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1079 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1080 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1081 dev->priv_flags |= IFF_DONT_BRIDGE;
1082 break;
1083 case NETDEV_GOING_DOWN:
1084 cfg80211_leave(rdev, wdev);
1085 break;
1086 case NETDEV_DOWN:
1087 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1088 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1089 if (WARN_ON(!rdev->scan_req->notified))
1090 rdev->scan_req->info.aborted = true;
1091 ___cfg80211_scan_done(rdev, false);
1092 }
1093
1094 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1095 if (WARN_ON(sched_scan_req &&
1096 sched_scan_req->dev == wdev->netdev)) {
1097 __cfg80211_stop_sched_scan(rdev, false);
1098 }
1099
1100 rdev->opencount--;
1101 wake_up(&rdev->dev_wait);
1102 break;
1103 case NETDEV_UP:
1104 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1105 wdev_lock(wdev);
1106 switch (wdev->iftype) {
1107 #ifdef CONFIG_CFG80211_WEXT
1108 case NL80211_IFTYPE_ADHOC:
1109 cfg80211_ibss_wext_join(rdev, wdev);
1110 break;
1111 case NL80211_IFTYPE_STATION:
1112 cfg80211_mgd_wext_connect(rdev, wdev);
1113 break;
1114 #endif
1115 #ifdef CONFIG_MAC80211_MESH
1116 case NL80211_IFTYPE_MESH_POINT:
1117 {
1118 /* backward compat code... */
1119 struct mesh_setup setup;
1120 memcpy(&setup, &default_mesh_setup,
1121 sizeof(setup));
1122 /* back compat only needed for mesh_id */
1123 setup.mesh_id = wdev->ssid;
1124 setup.mesh_id_len = wdev->mesh_id_up_len;
1125 if (wdev->mesh_id_up_len)
1126 __cfg80211_join_mesh(rdev, dev,
1127 &setup,
1128 &default_mesh_config);
1129 break;
1130 }
1131 #endif
1132 default:
1133 break;
1134 }
1135 wdev_unlock(wdev);
1136 rdev->opencount++;
1137
1138 /*
1139 * Configure power management to the driver here so that its
1140 * correctly set also after interface type changes etc.
1141 */
1142 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1143 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1144 rdev->ops->set_power_mgmt)
1145 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1146 wdev->ps_timeout)) {
1147 /* assume this means it's off */
1148 wdev->ps = false;
1149 }
1150 break;
1151 case NETDEV_UNREGISTER:
1152 /*
1153 * It is possible to get NETDEV_UNREGISTER
1154 * multiple times. To detect that, check
1155 * that the interface is still on the list
1156 * of registered interfaces, and only then
1157 * remove and clean it up.
1158 */
1159 if (!list_empty(&wdev->list)) {
1160 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1161 list_del_rcu(&wdev->list);
1162 rdev->devlist_generation++;
1163 cfg80211_mlme_purge_registrations(wdev);
1164 #ifdef CONFIG_CFG80211_WEXT
1165 kzfree(wdev->wext.keys);
1166 #endif
1167 }
1168 /*
1169 * synchronise (so that we won't find this netdev
1170 * from other code any more) and then clear the list
1171 * head so that the above code can safely check for
1172 * !list_empty() to avoid double-cleanup.
1173 */
1174 synchronize_rcu();
1175 INIT_LIST_HEAD(&wdev->list);
1176 /*
1177 * Ensure that all events have been processed and
1178 * freed.
1179 */
1180 cfg80211_process_wdev_events(wdev);
1181
1182 if (WARN_ON(wdev->current_bss)) {
1183 cfg80211_unhold_bss(wdev->current_bss);
1184 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1185 wdev->current_bss = NULL;
1186 }
1187 break;
1188 case NETDEV_PRE_UP:
1189 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1190 return notifier_from_errno(-EOPNOTSUPP);
1191 if (rfkill_blocked(rdev->rfkill))
1192 return notifier_from_errno(-ERFKILL);
1193 break;
1194 default:
1195 return NOTIFY_DONE;
1196 }
1197
1198 wireless_nlevent_flush();
1199
1200 return NOTIFY_OK;
1201 }
1202
1203 static struct notifier_block cfg80211_netdev_notifier = {
1204 .notifier_call = cfg80211_netdev_notifier_call,
1205 };
1206
1207 static void __net_exit cfg80211_pernet_exit(struct net *net)
1208 {
1209 struct cfg80211_registered_device *rdev;
1210
1211 rtnl_lock();
1212 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1213 if (net_eq(wiphy_net(&rdev->wiphy), net))
1214 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1215 }
1216 rtnl_unlock();
1217 }
1218
1219 static struct pernet_operations cfg80211_pernet_ops = {
1220 .exit = cfg80211_pernet_exit,
1221 };
1222
1223 static int __init cfg80211_init(void)
1224 {
1225 int err;
1226
1227 err = register_pernet_device(&cfg80211_pernet_ops);
1228 if (err)
1229 goto out_fail_pernet;
1230
1231 err = wiphy_sysfs_init();
1232 if (err)
1233 goto out_fail_sysfs;
1234
1235 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1236 if (err)
1237 goto out_fail_notifier;
1238
1239 err = nl80211_init();
1240 if (err)
1241 goto out_fail_nl80211;
1242
1243 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1244
1245 err = regulatory_init();
1246 if (err)
1247 goto out_fail_reg;
1248
1249 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1250 if (!cfg80211_wq) {
1251 err = -ENOMEM;
1252 goto out_fail_wq;
1253 }
1254
1255 return 0;
1256
1257 out_fail_wq:
1258 regulatory_exit();
1259 out_fail_reg:
1260 debugfs_remove(ieee80211_debugfs_dir);
1261 nl80211_exit();
1262 out_fail_nl80211:
1263 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1264 out_fail_notifier:
1265 wiphy_sysfs_exit();
1266 out_fail_sysfs:
1267 unregister_pernet_device(&cfg80211_pernet_ops);
1268 out_fail_pernet:
1269 return err;
1270 }
1271 subsys_initcall(cfg80211_init);
1272
1273 static void __exit cfg80211_exit(void)
1274 {
1275 debugfs_remove(ieee80211_debugfs_dir);
1276 nl80211_exit();
1277 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1278 wiphy_sysfs_exit();
1279 regulatory_exit();
1280 unregister_pernet_device(&cfg80211_pernet_ops);
1281 destroy_workqueue(cfg80211_wq);
1282 }
1283 module_exit(cfg80211_exit);
Linux with added FPC-III support