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powerpc/eeh: Fix PE#0 check in eeh_add_to_parent_pe()
[linux/fpc-iii.git] / net / wireless / core.c
blob2a0bbd22854bd97b377139200f9e6b5e0ec2662f
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_DELAYED_WORK(&rdev->dfs_update_channels_wk,
411 cfg80211_dfs_channels_update_work);
412 #ifdef CONFIG_CFG80211_WEXT
413 rdev->wiphy.wext = &cfg80211_wext_handler;
414 #endif
415
416 device_initialize(&rdev->wiphy.dev);
417 rdev->wiphy.dev.class = &ieee80211_class;
418 rdev->wiphy.dev.platform_data = rdev;
419
420 INIT_LIST_HEAD(&rdev->destroy_list);
421 spin_lock_init(&rdev->destroy_list_lock);
422 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
423 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
424
425 #ifdef CONFIG_CFG80211_DEFAULT_PS
426 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
427 #endif
428
429 wiphy_net_set(&rdev->wiphy, &init_net);
430
431 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
432 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
433 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
434 &rdev->rfkill_ops, rdev);
435
436 if (!rdev->rfkill) {
437 kfree(rdev);
438 return NULL;
439 }
440
441 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
442 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
443 INIT_WORK(&rdev->event_work, cfg80211_event_work);
444
445 init_waitqueue_head(&rdev->dev_wait);
446
447 /*
448 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
449 * Fragmentation and RTS threshold are disabled by default with the
450 * special -1 value.
451 */
452 rdev->wiphy.retry_short = 7;
453 rdev->wiphy.retry_long = 4;
454 rdev->wiphy.frag_threshold = (u32) -1;
455 rdev->wiphy.rts_threshold = (u32) -1;
456 rdev->wiphy.coverage_class = 0;
457
458 rdev->wiphy.max_num_csa_counters = 1;
459
460 return &rdev->wiphy;
461 }
462 EXPORT_SYMBOL(wiphy_new_nm);
463
464 static int wiphy_verify_combinations(struct wiphy *wiphy)
465 {
466 const struct ieee80211_iface_combination *c;
467 int i, j;
468
469 for (i = 0; i < wiphy->n_iface_combinations; i++) {
470 u32 cnt = 0;
471 u16 all_iftypes = 0;
472
473 c = &wiphy->iface_combinations[i];
474
475 /*
476 * Combinations with just one interface aren't real,
477 * however we make an exception for DFS.
478 */
479 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
480 return -EINVAL;
481
482 /* Need at least one channel */
483 if (WARN_ON(!c->num_different_channels))
484 return -EINVAL;
485
486 /*
487 * Put a sane limit on maximum number of different
488 * channels to simplify channel accounting code.
489 */
490 if (WARN_ON(c->num_different_channels >
491 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
492 return -EINVAL;
493
494 /* DFS only works on one channel. */
495 if (WARN_ON(c->radar_detect_widths &&
496 (c->num_different_channels > 1)))
497 return -EINVAL;
498
499 if (WARN_ON(!c->n_limits))
500 return -EINVAL;
501
502 for (j = 0; j < c->n_limits; j++) {
503 u16 types = c->limits[j].types;
504
505 /* interface types shouldn't overlap */
506 if (WARN_ON(types & all_iftypes))
507 return -EINVAL;
508 all_iftypes |= types;
509
510 if (WARN_ON(!c->limits[j].max))
511 return -EINVAL;
512
513 /* Shouldn't list software iftypes in combinations! */
514 if (WARN_ON(wiphy->software_iftypes & types))
515 return -EINVAL;
516
517 /* Only a single P2P_DEVICE can be allowed */
518 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
519 c->limits[j].max > 1))
520 return -EINVAL;
521
522 cnt += c->limits[j].max;
523 /*
524 * Don't advertise an unsupported type
525 * in a combination.
526 */
527 if (WARN_ON((wiphy->interface_modes & types) != types))
528 return -EINVAL;
529 }
530
531 /* You can't even choose that many! */
532 if (WARN_ON(cnt < c->max_interfaces))
533 return -EINVAL;
534 }
535
536 return 0;
537 }
538
539 int wiphy_register(struct wiphy *wiphy)
540 {
541 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
542 int res;
543 enum ieee80211_band band;
544 struct ieee80211_supported_band *sband;
545 bool have_band = false;
546 int i;
547 u16 ifmodes = wiphy->interface_modes;
548
549 #ifdef CONFIG_PM
550 if (WARN_ON(wiphy->wowlan &&
551 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
552 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
553 return -EINVAL;
554 if (WARN_ON(wiphy->wowlan &&
555 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
556 !wiphy->wowlan->tcp))
557 return -EINVAL;
558 #endif
559 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
560 (!rdev->ops->tdls_channel_switch ||
561 !rdev->ops->tdls_cancel_channel_switch)))
562 return -EINVAL;
563
564 /*
565 * if a wiphy has unsupported modes for regulatory channel enforcement,
566 * opt-out of enforcement checking
567 */
568 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
569 BIT(NL80211_IFTYPE_P2P_CLIENT) |
570 BIT(NL80211_IFTYPE_AP) |
571 BIT(NL80211_IFTYPE_P2P_GO) |
572 BIT(NL80211_IFTYPE_ADHOC) |
573 BIT(NL80211_IFTYPE_P2P_DEVICE) |
574 BIT(NL80211_IFTYPE_AP_VLAN) |
575 BIT(NL80211_IFTYPE_MONITOR)))
576 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
577
578 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
579 (wiphy->regulatory_flags &
580 (REGULATORY_CUSTOM_REG |
581 REGULATORY_STRICT_REG |
582 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
583 REGULATORY_COUNTRY_IE_IGNORE))))
584 return -EINVAL;
585
586 if (WARN_ON(wiphy->coalesce &&
587 (!wiphy->coalesce->n_rules ||
588 !wiphy->coalesce->n_patterns) &&
589 (!wiphy->coalesce->pattern_min_len ||
590 wiphy->coalesce->pattern_min_len >
591 wiphy->coalesce->pattern_max_len)))
592 return -EINVAL;
593
594 if (WARN_ON(wiphy->ap_sme_capa &&
595 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
596 return -EINVAL;
597
598 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
599 return -EINVAL;
600
601 if (WARN_ON(wiphy->addresses &&
602 !is_zero_ether_addr(wiphy->perm_addr) &&
603 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
604 ETH_ALEN)))
605 return -EINVAL;
606
607 if (WARN_ON(wiphy->max_acl_mac_addrs &&
608 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
609 !rdev->ops->set_mac_acl)))
610 return -EINVAL;
611
612 if (wiphy->addresses)
613 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
614
615 /* sanity check ifmodes */
616 WARN_ON(!ifmodes);
617 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
618 if (WARN_ON(ifmodes != wiphy->interface_modes))
619 wiphy->interface_modes = ifmodes;
620
621 res = wiphy_verify_combinations(wiphy);
622 if (res)
623 return res;
624
625 /* sanity check supported bands/channels */
626 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
627 sband = wiphy->bands[band];
628 if (!sband)
629 continue;
630
631 sband->band = band;
632 if (WARN_ON(!sband->n_channels))
633 return -EINVAL;
634 /*
635 * on 60gHz band, there are no legacy rates, so
636 * n_bitrates is 0
637 */
638 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
639 !sband->n_bitrates))
640 return -EINVAL;
641
642 /*
643 * Since cfg80211_disable_40mhz_24ghz is global, we can
644 * modify the sband's ht data even if the driver uses a
645 * global structure for that.
646 */
647 if (cfg80211_disable_40mhz_24ghz &&
648 band == IEEE80211_BAND_2GHZ &&
649 sband->ht_cap.ht_supported) {
650 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
651 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
652 }
653
654 /*
655 * Since we use a u32 for rate bitmaps in
656 * ieee80211_get_response_rate, we cannot
657 * have more than 32 legacy rates.
658 */
659 if (WARN_ON(sband->n_bitrates > 32))
660 return -EINVAL;
661
662 for (i = 0; i < sband->n_channels; i++) {
663 sband->channels[i].orig_flags =
664 sband->channels[i].flags;
665 sband->channels[i].orig_mag = INT_MAX;
666 sband->channels[i].orig_mpwr =
667 sband->channels[i].max_power;
668 sband->channels[i].band = band;
669 }
670
671 have_band = true;
672 }
673
674 if (!have_band) {
675 WARN_ON(1);
676 return -EINVAL;
677 }
678
679 #ifdef CONFIG_PM
680 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
681 (!rdev->wiphy.wowlan->pattern_min_len ||
682 rdev->wiphy.wowlan->pattern_min_len >
683 rdev->wiphy.wowlan->pattern_max_len)))
684 return -EINVAL;
685 #endif
686
687 /* check and set up bitrates */
688 ieee80211_set_bitrate_flags(wiphy);
689
690 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
691
692 rtnl_lock();
693 res = device_add(&rdev->wiphy.dev);
694 if (res) {
695 rtnl_unlock();
696 return res;
697 }
698
699 /* set up regulatory info */
700 wiphy_regulatory_register(wiphy);
701
702 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
703 cfg80211_rdev_list_generation++;
704
705 /* add to debugfs */
706 rdev->wiphy.debugfsdir =
707 debugfs_create_dir(wiphy_name(&rdev->wiphy),
708 ieee80211_debugfs_dir);
709 if (IS_ERR(rdev->wiphy.debugfsdir))
710 rdev->wiphy.debugfsdir = NULL;
711
712 cfg80211_debugfs_rdev_add(rdev);
713 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
714
715 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
716 struct regulatory_request request;
717
718 request.wiphy_idx = get_wiphy_idx(wiphy);
719 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
720 request.alpha2[0] = '9';
721 request.alpha2[1] = '9';
722
723 nl80211_send_reg_change_event(&request);
724 }
725
726 rdev->wiphy.registered = true;
727 rtnl_unlock();
728
729 res = rfkill_register(rdev->rfkill);
730 if (res) {
731 rfkill_destroy(rdev->rfkill);
732 rdev->rfkill = NULL;
733 wiphy_unregister(&rdev->wiphy);
734 return res;
735 }
736
737 return 0;
738 }
739 EXPORT_SYMBOL(wiphy_register);
740
741 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
742 {
743 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
744
745 if (!rdev->ops->rfkill_poll)
746 return;
747 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
748 rfkill_resume_polling(rdev->rfkill);
749 }
750 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
751
752 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
753 {
754 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
755
756 rfkill_pause_polling(rdev->rfkill);
757 }
758 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
759
760 void wiphy_unregister(struct wiphy *wiphy)
761 {
762 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
763
764 wait_event(rdev->dev_wait, ({
765 int __count;
766 rtnl_lock();
767 __count = rdev->opencount;
768 rtnl_unlock();
769 __count == 0; }));
770
771 if (rdev->rfkill)
772 rfkill_unregister(rdev->rfkill);
773
774 rtnl_lock();
775 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
776 rdev->wiphy.registered = false;
777
778 WARN_ON(!list_empty(&rdev->wdev_list));
779
780 /*
781 * First remove the hardware from everywhere, this makes
782 * it impossible to find from userspace.
783 */
784 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
785 list_del_rcu(&rdev->list);
786 synchronize_rcu();
787
788 /*
789 * If this device got a regulatory hint tell core its
790 * free to listen now to a new shiny device regulatory hint
791 */
792 wiphy_regulatory_deregister(wiphy);
793
794 cfg80211_rdev_list_generation++;
795 device_del(&rdev->wiphy.dev);
796
797 rtnl_unlock();
798
799 flush_work(&rdev->scan_done_wk);
800 cancel_work_sync(&rdev->conn_work);
801 flush_work(&rdev->event_work);
802 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
803 flush_work(&rdev->destroy_work);
804 flush_work(&rdev->sched_scan_stop_wk);
805
806 #ifdef CONFIG_PM
807 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
808 rdev_set_wakeup(rdev, false);
809 #endif
810 cfg80211_rdev_free_wowlan(rdev);
811 cfg80211_rdev_free_coalesce(rdev);
812 }
813 EXPORT_SYMBOL(wiphy_unregister);
814
815 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
816 {
817 struct cfg80211_internal_bss *scan, *tmp;
818 struct cfg80211_beacon_registration *reg, *treg;
819 rfkill_destroy(rdev->rfkill);
820 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
821 list_del(&reg->list);
822 kfree(reg);
823 }
824 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
825 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
826 kfree(rdev);
827 }
828
829 void wiphy_free(struct wiphy *wiphy)
830 {
831 put_device(&wiphy->dev);
832 }
833 EXPORT_SYMBOL(wiphy_free);
834
835 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
836 {
837 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
838
839 if (rfkill_set_hw_state(rdev->rfkill, blocked))
840 schedule_work(&rdev->rfkill_sync);
841 }
842 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
843
844 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
845 {
846 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
847
848 ASSERT_RTNL();
849
850 if (WARN_ON(wdev->netdev))
851 return;
852
853 list_del_rcu(&wdev->list);
854 rdev->devlist_generation++;
855
856 switch (wdev->iftype) {
857 case NL80211_IFTYPE_P2P_DEVICE:
858 cfg80211_stop_p2p_device(rdev, wdev);
859 break;
860 default:
861 WARN_ON_ONCE(1);
862 break;
863 }
864 }
865 EXPORT_SYMBOL(cfg80211_unregister_wdev);
866
867 static const struct device_type wiphy_type = {
868 .name = "wlan",
869 };
870
871 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
872 enum nl80211_iftype iftype, int num)
873 {
874 ASSERT_RTNL();
875
876 rdev->num_running_ifaces += num;
877 if (iftype == NL80211_IFTYPE_MONITOR)
878 rdev->num_running_monitor_ifaces += num;
879 }
880
881 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
882 struct wireless_dev *wdev)
883 {
884 struct net_device *dev = wdev->netdev;
885 struct cfg80211_sched_scan_request *sched_scan_req;
886
887 ASSERT_RTNL();
888 ASSERT_WDEV_LOCK(wdev);
889
890 switch (wdev->iftype) {
891 case NL80211_IFTYPE_ADHOC:
892 __cfg80211_leave_ibss(rdev, dev, true);
893 break;
894 case NL80211_IFTYPE_P2P_CLIENT:
895 case NL80211_IFTYPE_STATION:
896 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
897 if (sched_scan_req && dev == sched_scan_req->dev)
898 __cfg80211_stop_sched_scan(rdev, false);
899
900 #ifdef CONFIG_CFG80211_WEXT
901 kfree(wdev->wext.ie);
902 wdev->wext.ie = NULL;
903 wdev->wext.ie_len = 0;
904 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
905 #endif
906 cfg80211_disconnect(rdev, dev,
907 WLAN_REASON_DEAUTH_LEAVING, true);
908 break;
909 case NL80211_IFTYPE_MESH_POINT:
910 __cfg80211_leave_mesh(rdev, dev);
911 break;
912 case NL80211_IFTYPE_AP:
913 case NL80211_IFTYPE_P2P_GO:
914 __cfg80211_stop_ap(rdev, dev, true);
915 break;
916 case NL80211_IFTYPE_OCB:
917 __cfg80211_leave_ocb(rdev, dev);
918 break;
919 case NL80211_IFTYPE_WDS:
920 /* must be handled by mac80211/driver, has no APIs */
921 break;
922 case NL80211_IFTYPE_P2P_DEVICE:
923 /* cannot happen, has no netdev */
924 break;
925 case NL80211_IFTYPE_AP_VLAN:
926 case NL80211_IFTYPE_MONITOR:
927 /* nothing to do */
928 break;
929 case NL80211_IFTYPE_UNSPECIFIED:
930 case NUM_NL80211_IFTYPES:
931 /* invalid */
932 break;
933 }
934 }
935
936 void cfg80211_leave(struct cfg80211_registered_device *rdev,
937 struct wireless_dev *wdev)
938 {
939 wdev_lock(wdev);
940 __cfg80211_leave(rdev, wdev);
941 wdev_unlock(wdev);
942 }
943
944 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
945 gfp_t gfp)
946 {
947 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
948 struct cfg80211_event *ev;
949 unsigned long flags;
950
951 trace_cfg80211_stop_iface(wiphy, wdev);
952
953 ev = kzalloc(sizeof(*ev), gfp);
954 if (!ev)
955 return;
956
957 ev->type = EVENT_STOPPED;
958
959 spin_lock_irqsave(&wdev->event_lock, flags);
960 list_add_tail(&ev->list, &wdev->event_list);
961 spin_unlock_irqrestore(&wdev->event_lock, flags);
962 queue_work(cfg80211_wq, &rdev->event_work);
963 }
964 EXPORT_SYMBOL(cfg80211_stop_iface);
965
966 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
967 unsigned long state, void *ptr)
968 {
969 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
970 struct wireless_dev *wdev = dev->ieee80211_ptr;
971 struct cfg80211_registered_device *rdev;
972 struct cfg80211_sched_scan_request *sched_scan_req;
973
974 if (!wdev)
975 return NOTIFY_DONE;
976
977 rdev = wiphy_to_rdev(wdev->wiphy);
978
979 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
980
981 switch (state) {
982 case NETDEV_POST_INIT:
983 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
984 break;
985 case NETDEV_REGISTER:
986 /*
987 * NB: cannot take rdev->mtx here because this may be
988 * called within code protected by it when interfaces
989 * are added with nl80211.
990 */
991 mutex_init(&wdev->mtx);
992 INIT_LIST_HEAD(&wdev->event_list);
993 spin_lock_init(&wdev->event_lock);
994 INIT_LIST_HEAD(&wdev->mgmt_registrations);
995 spin_lock_init(&wdev->mgmt_registrations_lock);
996
997 wdev->identifier = ++rdev->wdev_id;
998 list_add_rcu(&wdev->list, &rdev->wdev_list);
999 rdev->devlist_generation++;
1000 /* can only change netns with wiphy */
1001 dev->features |= NETIF_F_NETNS_LOCAL;
1002
1003 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1004 "phy80211")) {
1005 pr_err("failed to add phy80211 symlink to netdev!\n");
1006 }
1007 wdev->netdev = dev;
1008 #ifdef CONFIG_CFG80211_WEXT
1009 wdev->wext.default_key = -1;
1010 wdev->wext.default_mgmt_key = -1;
1011 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1012 #endif
1013
1014 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1015 wdev->ps = true;
1016 else
1017 wdev->ps = false;
1018 /* allow mac80211 to determine the timeout */
1019 wdev->ps_timeout = -1;
1020
1021 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1022 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1023 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1024 dev->priv_flags |= IFF_DONT_BRIDGE;
1025 break;
1026 case NETDEV_GOING_DOWN:
1027 cfg80211_leave(rdev, wdev);
1028 break;
1029 case NETDEV_DOWN:
1030 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1031 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1032 if (WARN_ON(!rdev->scan_req->notified))
1033 rdev->scan_req->aborted = true;
1034 ___cfg80211_scan_done(rdev, false);
1035 }
1036
1037 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1038 if (WARN_ON(sched_scan_req &&
1039 sched_scan_req->dev == wdev->netdev)) {
1040 __cfg80211_stop_sched_scan(rdev, false);
1041 }
1042
1043 rdev->opencount--;
1044 wake_up(&rdev->dev_wait);
1045 break;
1046 case NETDEV_UP:
1047 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1048 wdev_lock(wdev);
1049 switch (wdev->iftype) {
1050 #ifdef CONFIG_CFG80211_WEXT
1051 case NL80211_IFTYPE_ADHOC:
1052 cfg80211_ibss_wext_join(rdev, wdev);
1053 break;
1054 case NL80211_IFTYPE_STATION:
1055 cfg80211_mgd_wext_connect(rdev, wdev);
1056 break;
1057 #endif
1058 #ifdef CONFIG_MAC80211_MESH
1059 case NL80211_IFTYPE_MESH_POINT:
1060 {
1061 /* backward compat code... */
1062 struct mesh_setup setup;
1063 memcpy(&setup, &default_mesh_setup,
1064 sizeof(setup));
1065 /* back compat only needed for mesh_id */
1066 setup.mesh_id = wdev->ssid;
1067 setup.mesh_id_len = wdev->mesh_id_up_len;
1068 if (wdev->mesh_id_up_len)
1069 __cfg80211_join_mesh(rdev, dev,
1070 &setup,
1071 &default_mesh_config);
1072 break;
1073 }
1074 #endif
1075 default:
1076 break;
1077 }
1078 wdev_unlock(wdev);
1079 rdev->opencount++;
1080
1081 /*
1082 * Configure power management to the driver here so that its
1083 * correctly set also after interface type changes etc.
1084 */
1085 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1086 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1087 rdev->ops->set_power_mgmt)
1088 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1089 wdev->ps_timeout)) {
1090 /* assume this means it's off */
1091 wdev->ps = false;
1092 }
1093 break;
1094 case NETDEV_UNREGISTER:
1095 /*
1096 * It is possible to get NETDEV_UNREGISTER
1097 * multiple times. To detect that, check
1098 * that the interface is still on the list
1099 * of registered interfaces, and only then
1100 * remove and clean it up.
1101 */
1102 if (!list_empty(&wdev->list)) {
1103 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1104 list_del_rcu(&wdev->list);
1105 rdev->devlist_generation++;
1106 cfg80211_mlme_purge_registrations(wdev);
1107 #ifdef CONFIG_CFG80211_WEXT
1108 kzfree(wdev->wext.keys);
1109 #endif
1110 }
1111 /*
1112 * synchronise (so that we won't find this netdev
1113 * from other code any more) and then clear the list
1114 * head so that the above code can safely check for
1115 * !list_empty() to avoid double-cleanup.
1116 */
1117 synchronize_rcu();
1118 INIT_LIST_HEAD(&wdev->list);
1119 /*
1120 * Ensure that all events have been processed and
1121 * freed.
1122 */
1123 cfg80211_process_wdev_events(wdev);
1124
1125 if (WARN_ON(wdev->current_bss)) {
1126 cfg80211_unhold_bss(wdev->current_bss);
1127 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1128 wdev->current_bss = NULL;
1129 }
1130 break;
1131 case NETDEV_PRE_UP:
1132 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1133 return notifier_from_errno(-EOPNOTSUPP);
1134 if (rfkill_blocked(rdev->rfkill))
1135 return notifier_from_errno(-ERFKILL);
1136 break;
1137 default:
1138 return NOTIFY_DONE;
1139 }
1140
1141 return NOTIFY_OK;
1142 }
1143
1144 static struct notifier_block cfg80211_netdev_notifier = {
1145 .notifier_call = cfg80211_netdev_notifier_call,
1146 };
1147
1148 static void __net_exit cfg80211_pernet_exit(struct net *net)
1149 {
1150 struct cfg80211_registered_device *rdev;
1151
1152 rtnl_lock();
1153 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1154 if (net_eq(wiphy_net(&rdev->wiphy), net))
1155 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1156 }
1157 rtnl_unlock();
1158 }
1159
1160 static struct pernet_operations cfg80211_pernet_ops = {
1161 .exit = cfg80211_pernet_exit,
1162 };
1163
1164 static int __init cfg80211_init(void)
1165 {
1166 int err;
1167
1168 err = register_pernet_device(&cfg80211_pernet_ops);
1169 if (err)
1170 goto out_fail_pernet;
1171
1172 err = wiphy_sysfs_init();
1173 if (err)
1174 goto out_fail_sysfs;
1175
1176 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1177 if (err)
1178 goto out_fail_notifier;
1179
1180 err = nl80211_init();
1181 if (err)
1182 goto out_fail_nl80211;
1183
1184 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1185
1186 err = regulatory_init();
1187 if (err)
1188 goto out_fail_reg;
1189
1190 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1191 if (!cfg80211_wq) {
1192 err = -ENOMEM;
1193 goto out_fail_wq;
1194 }
1195
1196 return 0;
1197
1198 out_fail_wq:
1199 regulatory_exit();
1200 out_fail_reg:
1201 debugfs_remove(ieee80211_debugfs_dir);
1202 nl80211_exit();
1203 out_fail_nl80211:
1204 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1205 out_fail_notifier:
1206 wiphy_sysfs_exit();
1207 out_fail_sysfs:
1208 unregister_pernet_device(&cfg80211_pernet_ops);
1209 out_fail_pernet:
1210 return err;
1211 }
1212 subsys_initcall(cfg80211_init);
1213
1214 static void __exit cfg80211_exit(void)
1215 {
1216 debugfs_remove(ieee80211_debugfs_dir);
1217 nl80211_exit();
1218 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1219 wiphy_sysfs_exit();
1220 regulatory_exit();
1221 unregister_pernet_device(&cfg80211_pernet_ops);
1222 destroy_workqueue(cfg80211_wq);
1223 }
1224 module_exit(cfg80211_exit);
Linux with added FPC-III support