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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux/fpc-iii.git] / net / wireless / core.c
blobd25c82bc1bbe8e80ee0761b466e16088040c717d
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->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 WARN_ON(ops->set_tx_power && !ops->get_tx_power);
367 WARN_ON(ops->set_antenna && !ops->get_antenna);
368
369 alloc_size = sizeof(*rdev) + sizeof_priv;
370
371 rdev = kzalloc(alloc_size, GFP_KERNEL);
372 if (!rdev)
373 return NULL;
374
375 rdev->ops = ops;
376
377 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
378
379 if (unlikely(rdev->wiphy_idx < 0)) {
380 /* ugh, wrapped! */
381 atomic_dec(&wiphy_counter);
382 kfree(rdev);
383 return NULL;
384 }
385
386 /* atomic_inc_return makes it start at 1, make it start at 0 */
387 rdev->wiphy_idx--;
388
389 /* give it a proper name */
390 if (requested_name && requested_name[0]) {
391 int rv;
392
393 rtnl_lock();
394 rv = cfg80211_dev_check_name(rdev, requested_name);
395
396 if (rv < 0) {
397 rtnl_unlock();
398 goto use_default_name;
399 }
400
401 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
402 rtnl_unlock();
403 if (rv)
404 goto use_default_name;
405 } else {
406 use_default_name:
407 /* NOTE: This is *probably* safe w/out holding rtnl because of
408 * the restrictions on phy names. Probably this call could
409 * fail if some other part of the kernel (re)named a device
410 * phyX. But, might should add some locking and check return
411 * value, and use a different name if this one exists?
412 */
413 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
414 }
415
416 INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
417 INIT_LIST_HEAD(&rdev->beacon_registrations);
418 spin_lock_init(&rdev->beacon_registrations_lock);
419 spin_lock_init(&rdev->bss_lock);
420 INIT_LIST_HEAD(&rdev->bss_list);
421 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
422 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
423 INIT_LIST_HEAD(&rdev->mlme_unreg);
424 spin_lock_init(&rdev->mlme_unreg_lock);
425 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
426 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
427 cfg80211_dfs_channels_update_work);
428 #ifdef CONFIG_CFG80211_WEXT
429 rdev->wiphy.wext = &cfg80211_wext_handler;
430 #endif
431
432 device_initialize(&rdev->wiphy.dev);
433 rdev->wiphy.dev.class = &ieee80211_class;
434 rdev->wiphy.dev.platform_data = rdev;
435 device_enable_async_suspend(&rdev->wiphy.dev);
436
437 INIT_LIST_HEAD(&rdev->destroy_list);
438 spin_lock_init(&rdev->destroy_list_lock);
439 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
440 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
441
442 #ifdef CONFIG_CFG80211_DEFAULT_PS
443 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
444 #endif
445
446 wiphy_net_set(&rdev->wiphy, &init_net);
447
448 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
449 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
450 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
451 &rdev->rfkill_ops, rdev);
452
453 if (!rdev->rfkill) {
454 kfree(rdev);
455 return NULL;
456 }
457
458 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
459 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
460 INIT_WORK(&rdev->event_work, cfg80211_event_work);
461
462 init_waitqueue_head(&rdev->dev_wait);
463
464 /*
465 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
466 * Fragmentation and RTS threshold are disabled by default with the
467 * special -1 value.
468 */
469 rdev->wiphy.retry_short = 7;
470 rdev->wiphy.retry_long = 4;
471 rdev->wiphy.frag_threshold = (u32) -1;
472 rdev->wiphy.rts_threshold = (u32) -1;
473 rdev->wiphy.coverage_class = 0;
474
475 rdev->wiphy.max_num_csa_counters = 1;
476
477 rdev->wiphy.max_sched_scan_plans = 1;
478 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
479
480 return &rdev->wiphy;
481 }
482 EXPORT_SYMBOL(wiphy_new_nm);
483
484 static int wiphy_verify_combinations(struct wiphy *wiphy)
485 {
486 const struct ieee80211_iface_combination *c;
487 int i, j;
488
489 for (i = 0; i < wiphy->n_iface_combinations; i++) {
490 u32 cnt = 0;
491 u16 all_iftypes = 0;
492
493 c = &wiphy->iface_combinations[i];
494
495 /*
496 * Combinations with just one interface aren't real,
497 * however we make an exception for DFS.
498 */
499 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
500 return -EINVAL;
501
502 /* Need at least one channel */
503 if (WARN_ON(!c->num_different_channels))
504 return -EINVAL;
505
506 /*
507 * Put a sane limit on maximum number of different
508 * channels to simplify channel accounting code.
509 */
510 if (WARN_ON(c->num_different_channels >
511 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
512 return -EINVAL;
513
514 /* DFS only works on one channel. */
515 if (WARN_ON(c->radar_detect_widths &&
516 (c->num_different_channels > 1)))
517 return -EINVAL;
518
519 if (WARN_ON(!c->n_limits))
520 return -EINVAL;
521
522 for (j = 0; j < c->n_limits; j++) {
523 u16 types = c->limits[j].types;
524
525 /* interface types shouldn't overlap */
526 if (WARN_ON(types & all_iftypes))
527 return -EINVAL;
528 all_iftypes |= types;
529
530 if (WARN_ON(!c->limits[j].max))
531 return -EINVAL;
532
533 /* Shouldn't list software iftypes in combinations! */
534 if (WARN_ON(wiphy->software_iftypes & types))
535 return -EINVAL;
536
537 /* Only a single P2P_DEVICE can be allowed */
538 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
539 c->limits[j].max > 1))
540 return -EINVAL;
541
542 cnt += c->limits[j].max;
543 /*
544 * Don't advertise an unsupported type
545 * in a combination.
546 */
547 if (WARN_ON((wiphy->interface_modes & types) != types))
548 return -EINVAL;
549 }
550
551 /* You can't even choose that many! */
552 if (WARN_ON(cnt < c->max_interfaces))
553 return -EINVAL;
554 }
555
556 return 0;
557 }
558
559 int wiphy_register(struct wiphy *wiphy)
560 {
561 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
562 int res;
563 enum nl80211_band band;
564 struct ieee80211_supported_band *sband;
565 bool have_band = false;
566 int i;
567 u16 ifmodes = wiphy->interface_modes;
568
569 #ifdef CONFIG_PM
570 if (WARN_ON(wiphy->wowlan &&
571 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
572 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
573 return -EINVAL;
574 if (WARN_ON(wiphy->wowlan &&
575 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
576 !wiphy->wowlan->tcp))
577 return -EINVAL;
578 #endif
579 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
580 (!rdev->ops->tdls_channel_switch ||
581 !rdev->ops->tdls_cancel_channel_switch)))
582 return -EINVAL;
583
584 /*
585 * if a wiphy has unsupported modes for regulatory channel enforcement,
586 * opt-out of enforcement checking
587 */
588 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
589 BIT(NL80211_IFTYPE_P2P_CLIENT) |
590 BIT(NL80211_IFTYPE_AP) |
591 BIT(NL80211_IFTYPE_P2P_GO) |
592 BIT(NL80211_IFTYPE_ADHOC) |
593 BIT(NL80211_IFTYPE_P2P_DEVICE) |
594 BIT(NL80211_IFTYPE_AP_VLAN) |
595 BIT(NL80211_IFTYPE_MONITOR)))
596 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
597
598 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
599 (wiphy->regulatory_flags &
600 (REGULATORY_CUSTOM_REG |
601 REGULATORY_STRICT_REG |
602 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
603 REGULATORY_COUNTRY_IE_IGNORE))))
604 return -EINVAL;
605
606 if (WARN_ON(wiphy->coalesce &&
607 (!wiphy->coalesce->n_rules ||
608 !wiphy->coalesce->n_patterns) &&
609 (!wiphy->coalesce->pattern_min_len ||
610 wiphy->coalesce->pattern_min_len >
611 wiphy->coalesce->pattern_max_len)))
612 return -EINVAL;
613
614 if (WARN_ON(wiphy->ap_sme_capa &&
615 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
616 return -EINVAL;
617
618 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
619 return -EINVAL;
620
621 if (WARN_ON(wiphy->addresses &&
622 !is_zero_ether_addr(wiphy->perm_addr) &&
623 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
624 ETH_ALEN)))
625 return -EINVAL;
626
627 if (WARN_ON(wiphy->max_acl_mac_addrs &&
628 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
629 !rdev->ops->set_mac_acl)))
630 return -EINVAL;
631
632 /* assure only valid behaviours are flagged by driver
633 * hence subtract 2 as bit 0 is invalid.
634 */
635 if (WARN_ON(wiphy->bss_select_support &&
636 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
637 return -EINVAL;
638
639 if (wiphy->addresses)
640 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
641
642 /* sanity check ifmodes */
643 WARN_ON(!ifmodes);
644 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
645 if (WARN_ON(ifmodes != wiphy->interface_modes))
646 wiphy->interface_modes = ifmodes;
647
648 res = wiphy_verify_combinations(wiphy);
649 if (res)
650 return res;
651
652 /* sanity check supported bands/channels */
653 for (band = 0; band < NUM_NL80211_BANDS; band++) {
654 sband = wiphy->bands[band];
655 if (!sband)
656 continue;
657
658 sband->band = band;
659 if (WARN_ON(!sband->n_channels))
660 return -EINVAL;
661 /*
662 * on 60GHz band, there are no legacy rates, so
663 * n_bitrates is 0
664 */
665 if (WARN_ON(band != NL80211_BAND_60GHZ &&
666 !sband->n_bitrates))
667 return -EINVAL;
668
669 /*
670 * Since cfg80211_disable_40mhz_24ghz is global, we can
671 * modify the sband's ht data even if the driver uses a
672 * global structure for that.
673 */
674 if (cfg80211_disable_40mhz_24ghz &&
675 band == NL80211_BAND_2GHZ &&
676 sband->ht_cap.ht_supported) {
677 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
678 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
679 }
680
681 /*
682 * Since we use a u32 for rate bitmaps in
683 * ieee80211_get_response_rate, we cannot
684 * have more than 32 legacy rates.
685 */
686 if (WARN_ON(sband->n_bitrates > 32))
687 return -EINVAL;
688
689 for (i = 0; i < sband->n_channels; i++) {
690 sband->channels[i].orig_flags =
691 sband->channels[i].flags;
692 sband->channels[i].orig_mag = INT_MAX;
693 sband->channels[i].orig_mpwr =
694 sband->channels[i].max_power;
695 sband->channels[i].band = band;
696 }
697
698 have_band = true;
699 }
700
701 if (!have_band) {
702 WARN_ON(1);
703 return -EINVAL;
704 }
705
706 #ifdef CONFIG_PM
707 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
708 (!rdev->wiphy.wowlan->pattern_min_len ||
709 rdev->wiphy.wowlan->pattern_min_len >
710 rdev->wiphy.wowlan->pattern_max_len)))
711 return -EINVAL;
712 #endif
713
714 /* check and set up bitrates */
715 ieee80211_set_bitrate_flags(wiphy);
716
717 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
718
719 rtnl_lock();
720 res = device_add(&rdev->wiphy.dev);
721 if (res) {
722 rtnl_unlock();
723 return res;
724 }
725
726 /* set up regulatory info */
727 wiphy_regulatory_register(wiphy);
728
729 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
730 cfg80211_rdev_list_generation++;
731
732 /* add to debugfs */
733 rdev->wiphy.debugfsdir =
734 debugfs_create_dir(wiphy_name(&rdev->wiphy),
735 ieee80211_debugfs_dir);
736 if (IS_ERR(rdev->wiphy.debugfsdir))
737 rdev->wiphy.debugfsdir = NULL;
738
739 cfg80211_debugfs_rdev_add(rdev);
740 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
741
742 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
743 struct regulatory_request request;
744
745 request.wiphy_idx = get_wiphy_idx(wiphy);
746 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
747 request.alpha2[0] = '9';
748 request.alpha2[1] = '9';
749
750 nl80211_send_reg_change_event(&request);
751 }
752
753 rdev->wiphy.registered = true;
754 rtnl_unlock();
755
756 res = rfkill_register(rdev->rfkill);
757 if (res) {
758 rfkill_destroy(rdev->rfkill);
759 rdev->rfkill = NULL;
760 wiphy_unregister(&rdev->wiphy);
761 return res;
762 }
763
764 return 0;
765 }
766 EXPORT_SYMBOL(wiphy_register);
767
768 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
769 {
770 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
771
772 if (!rdev->ops->rfkill_poll)
773 return;
774 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
775 rfkill_resume_polling(rdev->rfkill);
776 }
777 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
778
779 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
780 {
781 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
782
783 rfkill_pause_polling(rdev->rfkill);
784 }
785 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
786
787 void wiphy_unregister(struct wiphy *wiphy)
788 {
789 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
790
791 wait_event(rdev->dev_wait, ({
792 int __count;
793 rtnl_lock();
794 __count = rdev->opencount;
795 rtnl_unlock();
796 __count == 0; }));
797
798 if (rdev->rfkill)
799 rfkill_unregister(rdev->rfkill);
800
801 rtnl_lock();
802 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
803 rdev->wiphy.registered = false;
804
805 WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
806
807 /*
808 * First remove the hardware from everywhere, this makes
809 * it impossible to find from userspace.
810 */
811 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
812 list_del_rcu(&rdev->list);
813 synchronize_rcu();
814
815 /*
816 * If this device got a regulatory hint tell core its
817 * free to listen now to a new shiny device regulatory hint
818 */
819 wiphy_regulatory_deregister(wiphy);
820
821 cfg80211_rdev_list_generation++;
822 device_del(&rdev->wiphy.dev);
823
824 rtnl_unlock();
825
826 flush_work(&rdev->scan_done_wk);
827 cancel_work_sync(&rdev->conn_work);
828 flush_work(&rdev->event_work);
829 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
830 flush_work(&rdev->destroy_work);
831 flush_work(&rdev->sched_scan_stop_wk);
832 flush_work(&rdev->mlme_unreg_wk);
833
834 #ifdef CONFIG_PM
835 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
836 rdev_set_wakeup(rdev, false);
837 #endif
838 cfg80211_rdev_free_wowlan(rdev);
839 cfg80211_rdev_free_coalesce(rdev);
840 }
841 EXPORT_SYMBOL(wiphy_unregister);
842
843 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
844 {
845 struct cfg80211_internal_bss *scan, *tmp;
846 struct cfg80211_beacon_registration *reg, *treg;
847 rfkill_destroy(rdev->rfkill);
848 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
849 list_del(&reg->list);
850 kfree(reg);
851 }
852 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
853 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
854 kfree(rdev);
855 }
856
857 void wiphy_free(struct wiphy *wiphy)
858 {
859 put_device(&wiphy->dev);
860 }
861 EXPORT_SYMBOL(wiphy_free);
862
863 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
864 {
865 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
866
867 if (rfkill_set_hw_state(rdev->rfkill, blocked))
868 schedule_work(&rdev->rfkill_sync);
869 }
870 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
871
872 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
873 {
874 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
875
876 ASSERT_RTNL();
877
878 if (WARN_ON(wdev->netdev))
879 return;
880
881 list_del_rcu(&wdev->list);
882 rdev->devlist_generation++;
883
884 switch (wdev->iftype) {
885 case NL80211_IFTYPE_P2P_DEVICE:
886 cfg80211_mlme_purge_registrations(wdev);
887 cfg80211_stop_p2p_device(rdev, wdev);
888 break;
889 default:
890 WARN_ON_ONCE(1);
891 break;
892 }
893 }
894 EXPORT_SYMBOL(cfg80211_unregister_wdev);
895
896 static const struct device_type wiphy_type = {
897 .name = "wlan",
898 };
899
900 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
901 enum nl80211_iftype iftype, int num)
902 {
903 ASSERT_RTNL();
904
905 rdev->num_running_ifaces += num;
906 if (iftype == NL80211_IFTYPE_MONITOR)
907 rdev->num_running_monitor_ifaces += num;
908 }
909
910 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
911 struct wireless_dev *wdev)
912 {
913 struct net_device *dev = wdev->netdev;
914 struct cfg80211_sched_scan_request *sched_scan_req;
915
916 ASSERT_RTNL();
917 ASSERT_WDEV_LOCK(wdev);
918
919 switch (wdev->iftype) {
920 case NL80211_IFTYPE_ADHOC:
921 __cfg80211_leave_ibss(rdev, dev, true);
922 break;
923 case NL80211_IFTYPE_P2P_CLIENT:
924 case NL80211_IFTYPE_STATION:
925 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
926 if (sched_scan_req && dev == sched_scan_req->dev)
927 __cfg80211_stop_sched_scan(rdev, false);
928
929 #ifdef CONFIG_CFG80211_WEXT
930 kfree(wdev->wext.ie);
931 wdev->wext.ie = NULL;
932 wdev->wext.ie_len = 0;
933 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
934 #endif
935 cfg80211_disconnect(rdev, dev,
936 WLAN_REASON_DEAUTH_LEAVING, true);
937 break;
938 case NL80211_IFTYPE_MESH_POINT:
939 __cfg80211_leave_mesh(rdev, dev);
940 break;
941 case NL80211_IFTYPE_AP:
942 case NL80211_IFTYPE_P2P_GO:
943 __cfg80211_stop_ap(rdev, dev, true);
944 break;
945 case NL80211_IFTYPE_OCB:
946 __cfg80211_leave_ocb(rdev, dev);
947 break;
948 case NL80211_IFTYPE_WDS:
949 /* must be handled by mac80211/driver, has no APIs */
950 break;
951 case NL80211_IFTYPE_P2P_DEVICE:
952 /* cannot happen, has no netdev */
953 break;
954 case NL80211_IFTYPE_AP_VLAN:
955 case NL80211_IFTYPE_MONITOR:
956 /* nothing to do */
957 break;
958 case NL80211_IFTYPE_UNSPECIFIED:
959 case NUM_NL80211_IFTYPES:
960 /* invalid */
961 break;
962 }
963 }
964
965 void cfg80211_leave(struct cfg80211_registered_device *rdev,
966 struct wireless_dev *wdev)
967 {
968 wdev_lock(wdev);
969 __cfg80211_leave(rdev, wdev);
970 wdev_unlock(wdev);
971 }
972
973 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
974 gfp_t gfp)
975 {
976 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
977 struct cfg80211_event *ev;
978 unsigned long flags;
979
980 trace_cfg80211_stop_iface(wiphy, wdev);
981
982 ev = kzalloc(sizeof(*ev), gfp);
983 if (!ev)
984 return;
985
986 ev->type = EVENT_STOPPED;
987
988 spin_lock_irqsave(&wdev->event_lock, flags);
989 list_add_tail(&ev->list, &wdev->event_list);
990 spin_unlock_irqrestore(&wdev->event_lock, flags);
991 queue_work(cfg80211_wq, &rdev->event_work);
992 }
993 EXPORT_SYMBOL(cfg80211_stop_iface);
994
995 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
996 unsigned long state, void *ptr)
997 {
998 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
999 struct wireless_dev *wdev = dev->ieee80211_ptr;
1000 struct cfg80211_registered_device *rdev;
1001 struct cfg80211_sched_scan_request *sched_scan_req;
1002
1003 if (!wdev)
1004 return NOTIFY_DONE;
1005
1006 rdev = wiphy_to_rdev(wdev->wiphy);
1007
1008 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1009
1010 switch (state) {
1011 case NETDEV_POST_INIT:
1012 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1013 break;
1014 case NETDEV_REGISTER:
1015 /*
1016 * NB: cannot take rdev->mtx here because this may be
1017 * called within code protected by it when interfaces
1018 * are added with nl80211.
1019 */
1020 mutex_init(&wdev->mtx);
1021 INIT_LIST_HEAD(&wdev->event_list);
1022 spin_lock_init(&wdev->event_lock);
1023 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1024 spin_lock_init(&wdev->mgmt_registrations_lock);
1025
1026 wdev->identifier = ++rdev->wdev_id;
1027 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1028 rdev->devlist_generation++;
1029 /* can only change netns with wiphy */
1030 dev->features |= NETIF_F_NETNS_LOCAL;
1031
1032 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1033 "phy80211")) {
1034 pr_err("failed to add phy80211 symlink to netdev!\n");
1035 }
1036 wdev->netdev = dev;
1037 #ifdef CONFIG_CFG80211_WEXT
1038 wdev->wext.default_key = -1;
1039 wdev->wext.default_mgmt_key = -1;
1040 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1041 #endif
1042
1043 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1044 wdev->ps = true;
1045 else
1046 wdev->ps = false;
1047 /* allow mac80211 to determine the timeout */
1048 wdev->ps_timeout = -1;
1049
1050 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1051 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1052 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1053 dev->priv_flags |= IFF_DONT_BRIDGE;
1054 break;
1055 case NETDEV_GOING_DOWN:
1056 cfg80211_leave(rdev, wdev);
1057 break;
1058 case NETDEV_DOWN:
1059 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1060 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1061 if (WARN_ON(!rdev->scan_req->notified))
1062 rdev->scan_req->aborted = true;
1063 ___cfg80211_scan_done(rdev, false);
1064 }
1065
1066 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1067 if (WARN_ON(sched_scan_req &&
1068 sched_scan_req->dev == wdev->netdev)) {
1069 __cfg80211_stop_sched_scan(rdev, false);
1070 }
1071
1072 rdev->opencount--;
1073 wake_up(&rdev->dev_wait);
1074 break;
1075 case NETDEV_UP:
1076 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1077 wdev_lock(wdev);
1078 switch (wdev->iftype) {
1079 #ifdef CONFIG_CFG80211_WEXT
1080 case NL80211_IFTYPE_ADHOC:
1081 cfg80211_ibss_wext_join(rdev, wdev);
1082 break;
1083 case NL80211_IFTYPE_STATION:
1084 cfg80211_mgd_wext_connect(rdev, wdev);
1085 break;
1086 #endif
1087 #ifdef CONFIG_MAC80211_MESH
1088 case NL80211_IFTYPE_MESH_POINT:
1089 {
1090 /* backward compat code... */
1091 struct mesh_setup setup;
1092 memcpy(&setup, &default_mesh_setup,
1093 sizeof(setup));
1094 /* back compat only needed for mesh_id */
1095 setup.mesh_id = wdev->ssid;
1096 setup.mesh_id_len = wdev->mesh_id_up_len;
1097 if (wdev->mesh_id_up_len)
1098 __cfg80211_join_mesh(rdev, dev,
1099 &setup,
1100 &default_mesh_config);
1101 break;
1102 }
1103 #endif
1104 default:
1105 break;
1106 }
1107 wdev_unlock(wdev);
1108 rdev->opencount++;
1109
1110 /*
1111 * Configure power management to the driver here so that its
1112 * correctly set also after interface type changes etc.
1113 */
1114 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1115 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1116 rdev->ops->set_power_mgmt)
1117 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1118 wdev->ps_timeout)) {
1119 /* assume this means it's off */
1120 wdev->ps = false;
1121 }
1122 break;
1123 case NETDEV_UNREGISTER:
1124 /*
1125 * It is possible to get NETDEV_UNREGISTER
1126 * multiple times. To detect that, check
1127 * that the interface is still on the list
1128 * of registered interfaces, and only then
1129 * remove and clean it up.
1130 */
1131 if (!list_empty(&wdev->list)) {
1132 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1133 list_del_rcu(&wdev->list);
1134 rdev->devlist_generation++;
1135 cfg80211_mlme_purge_registrations(wdev);
1136 #ifdef CONFIG_CFG80211_WEXT
1137 kzfree(wdev->wext.keys);
1138 #endif
1139 }
1140 /*
1141 * synchronise (so that we won't find this netdev
1142 * from other code any more) and then clear the list
1143 * head so that the above code can safely check for
1144 * !list_empty() to avoid double-cleanup.
1145 */
1146 synchronize_rcu();
1147 INIT_LIST_HEAD(&wdev->list);
1148 /*
1149 * Ensure that all events have been processed and
1150 * freed.
1151 */
1152 cfg80211_process_wdev_events(wdev);
1153
1154 if (WARN_ON(wdev->current_bss)) {
1155 cfg80211_unhold_bss(wdev->current_bss);
1156 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1157 wdev->current_bss = NULL;
1158 }
1159 break;
1160 case NETDEV_PRE_UP:
1161 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1162 return notifier_from_errno(-EOPNOTSUPP);
1163 if (rfkill_blocked(rdev->rfkill))
1164 return notifier_from_errno(-ERFKILL);
1165 break;
1166 default:
1167 return NOTIFY_DONE;
1168 }
1169
1170 wireless_nlevent_flush();
1171
1172 return NOTIFY_OK;
1173 }
1174
1175 static struct notifier_block cfg80211_netdev_notifier = {
1176 .notifier_call = cfg80211_netdev_notifier_call,
1177 };
1178
1179 static void __net_exit cfg80211_pernet_exit(struct net *net)
1180 {
1181 struct cfg80211_registered_device *rdev;
1182
1183 rtnl_lock();
1184 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1185 if (net_eq(wiphy_net(&rdev->wiphy), net))
1186 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1187 }
1188 rtnl_unlock();
1189 }
1190
1191 static struct pernet_operations cfg80211_pernet_ops = {
1192 .exit = cfg80211_pernet_exit,
1193 };
1194
1195 static int __init cfg80211_init(void)
1196 {
1197 int err;
1198
1199 err = register_pernet_device(&cfg80211_pernet_ops);
1200 if (err)
1201 goto out_fail_pernet;
1202
1203 err = wiphy_sysfs_init();
1204 if (err)
1205 goto out_fail_sysfs;
1206
1207 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1208 if (err)
1209 goto out_fail_notifier;
1210
1211 err = nl80211_init();
1212 if (err)
1213 goto out_fail_nl80211;
1214
1215 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1216
1217 err = regulatory_init();
1218 if (err)
1219 goto out_fail_reg;
1220
1221 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1222 if (!cfg80211_wq) {
1223 err = -ENOMEM;
1224 goto out_fail_wq;
1225 }
1226
1227 return 0;
1228
1229 out_fail_wq:
1230 regulatory_exit();
1231 out_fail_reg:
1232 debugfs_remove(ieee80211_debugfs_dir);
1233 nl80211_exit();
1234 out_fail_nl80211:
1235 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1236 out_fail_notifier:
1237 wiphy_sysfs_exit();
1238 out_fail_sysfs:
1239 unregister_pernet_device(&cfg80211_pernet_ops);
1240 out_fail_pernet:
1241 return err;
1242 }
1243 subsys_initcall(cfg80211_init);
1244
1245 static void __exit cfg80211_exit(void)
1246 {
1247 debugfs_remove(ieee80211_debugfs_dir);
1248 nl80211_exit();
1249 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1250 wiphy_sysfs_exit();
1251 regulatory_exit();
1252 unregister_pernet_device(&cfg80211_pernet_ops);
1253 destroy_workqueue(cfg80211_wq);
1254 }
1255 module_exit(cfg80211_exit);
Linux with added FPC-III support