macvtap: signal truncated packets
[linux/fpc-iii.git] / net / wireless / core.c
blob52b865fb7351ac3c221c120bc0cc236687a12513
1 /*
2 * This is the linux wireless configuration interface.
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
5 */
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #include <linux/if.h>
10 #include <linux/module.h>
11 #include <linux/err.h>
12 #include <linux/list.h>
13 #include <linux/slab.h>
14 #include <linux/nl80211.h>
15 #include <linux/debugfs.h>
16 #include <linux/notifier.h>
17 #include <linux/device.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/sched.h>
21 #include <net/genetlink.h>
22 #include <net/cfg80211.h>
23 #include "nl80211.h"
24 #include "core.h"
25 #include "sysfs.h"
26 #include "debugfs.h"
27 #include "wext-compat.h"
28 #include "ethtool.h"
29 #include "rdev-ops.h"
31 /* name for sysfs, %d is appended */
32 #define PHY_NAME "phy"
34 MODULE_AUTHOR("Johannes Berg");
35 MODULE_LICENSE("GPL");
36 MODULE_DESCRIPTION("wireless configuration support");
37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
39 /* RCU-protected (and RTNL for writers) */
40 LIST_HEAD(cfg80211_rdev_list);
41 int cfg80211_rdev_list_generation;
43 /* for debugfs */
44 static struct dentry *ieee80211_debugfs_dir;
46 /* for the cleanup, scan and event works */
47 struct workqueue_struct *cfg80211_wq;
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");
54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
56 struct cfg80211_registered_device *result = NULL, *rdev;
58 ASSERT_RTNL();
60 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
61 if (rdev->wiphy_idx == wiphy_idx) {
62 result = rdev;
63 break;
67 return result;
70 int get_wiphy_idx(struct wiphy *wiphy)
72 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
74 return rdev->wiphy_idx;
77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
79 struct cfg80211_registered_device *rdev;
81 ASSERT_RTNL();
83 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
84 if (!rdev)
85 return NULL;
86 return &rdev->wiphy;
89 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
90 char *newname)
92 struct cfg80211_registered_device *rdev2;
93 int wiphy_idx, taken = -1, result, digits;
95 ASSERT_RTNL();
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++;
105 * deny the name if it is phy<idx> where <idx> is printed
106 * without leading zeroes. taken == strlen(newname) here
108 if (taken == strlen(PHY_NAME) + digits)
109 return -EINVAL;
113 /* Ignore nop renames */
114 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
115 return 0;
117 /* Ensure another device does not already have this name. */
118 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
119 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
120 return -EINVAL;
122 result = device_rename(&rdev->wiphy.dev, newname);
123 if (result)
124 return result;
126 if (rdev->wiphy.debugfsdir &&
127 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
128 rdev->wiphy.debugfsdir,
129 rdev->wiphy.debugfsdir->d_parent,
130 newname))
131 pr_err("failed to rename debugfs dir to %s!\n", newname);
133 nl80211_notify_dev_rename(rdev);
135 return 0;
138 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
139 struct net *net)
141 struct wireless_dev *wdev;
142 int err = 0;
144 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
145 return -EOPNOTSUPP;
147 list_for_each_entry(wdev, &rdev->wdev_list, list) {
148 if (!wdev->netdev)
149 continue;
150 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
151 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
152 if (err)
153 break;
154 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
157 if (err) {
158 /* failed -- clean up to old netns */
159 net = wiphy_net(&rdev->wiphy);
161 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
162 list) {
163 if (!wdev->netdev)
164 continue;
165 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
166 err = dev_change_net_namespace(wdev->netdev, net,
167 "wlan%d");
168 WARN_ON(err);
169 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
172 return err;
175 wiphy_net_set(&rdev->wiphy, net);
177 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
178 WARN_ON(err);
180 return 0;
183 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
185 struct cfg80211_registered_device *rdev = data;
187 rdev_rfkill_poll(rdev);
190 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
191 struct wireless_dev *wdev)
193 ASSERT_RTNL();
195 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
196 return;
198 if (!wdev->p2p_started)
199 return;
201 rdev_stop_p2p_device(rdev, wdev);
202 wdev->p2p_started = false;
204 rdev->opencount--;
206 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
208 * If the scan request wasn't notified as done, set it
209 * to aborted and leak it after a warning. The driver
210 * should have notified us that it ended at the latest
211 * during rdev_stop_p2p_device().
213 if (WARN_ON(!rdev->scan_req->notified))
214 rdev->scan_req->aborted = true;
215 ___cfg80211_scan_done(rdev, !rdev->scan_req->notified);
219 static int cfg80211_rfkill_set_block(void *data, bool blocked)
221 struct cfg80211_registered_device *rdev = data;
222 struct wireless_dev *wdev;
224 if (!blocked)
225 return 0;
227 rtnl_lock();
229 list_for_each_entry(wdev, &rdev->wdev_list, list) {
230 if (wdev->netdev) {
231 dev_close(wdev->netdev);
232 continue;
234 /* otherwise, check iftype */
235 switch (wdev->iftype) {
236 case NL80211_IFTYPE_P2P_DEVICE:
237 cfg80211_stop_p2p_device(rdev, wdev);
238 break;
239 default:
240 break;
244 rtnl_unlock();
246 return 0;
249 static void cfg80211_rfkill_sync_work(struct work_struct *work)
251 struct cfg80211_registered_device *rdev;
253 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
254 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
257 static void cfg80211_event_work(struct work_struct *work)
259 struct cfg80211_registered_device *rdev;
261 rdev = container_of(work, struct cfg80211_registered_device,
262 event_work);
264 rtnl_lock();
265 cfg80211_process_rdev_events(rdev);
266 rtnl_unlock();
269 /* exported functions */
271 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
273 static atomic_t wiphy_counter = ATOMIC_INIT(0);
275 struct cfg80211_registered_device *rdev;
276 int alloc_size;
278 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
279 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
280 WARN_ON(ops->connect && !ops->disconnect);
281 WARN_ON(ops->join_ibss && !ops->leave_ibss);
282 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
283 WARN_ON(ops->add_station && !ops->del_station);
284 WARN_ON(ops->add_mpath && !ops->del_mpath);
285 WARN_ON(ops->join_mesh && !ops->leave_mesh);
287 alloc_size = sizeof(*rdev) + sizeof_priv;
289 rdev = kzalloc(alloc_size, GFP_KERNEL);
290 if (!rdev)
291 return NULL;
293 rdev->ops = ops;
295 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
297 if (unlikely(rdev->wiphy_idx < 0)) {
298 /* ugh, wrapped! */
299 atomic_dec(&wiphy_counter);
300 kfree(rdev);
301 return NULL;
304 /* atomic_inc_return makes it start at 1, make it start at 0 */
305 rdev->wiphy_idx--;
307 /* give it a proper name */
308 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
310 INIT_LIST_HEAD(&rdev->wdev_list);
311 INIT_LIST_HEAD(&rdev->beacon_registrations);
312 spin_lock_init(&rdev->beacon_registrations_lock);
313 spin_lock_init(&rdev->bss_lock);
314 INIT_LIST_HEAD(&rdev->bss_list);
315 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
316 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
317 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
318 cfg80211_dfs_channels_update_work);
319 #ifdef CONFIG_CFG80211_WEXT
320 rdev->wiphy.wext = &cfg80211_wext_handler;
321 #endif
323 device_initialize(&rdev->wiphy.dev);
324 rdev->wiphy.dev.class = &ieee80211_class;
325 rdev->wiphy.dev.platform_data = rdev;
327 #ifdef CONFIG_CFG80211_DEFAULT_PS
328 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
329 #endif
331 wiphy_net_set(&rdev->wiphy, &init_net);
333 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
334 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
335 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
336 &rdev->rfkill_ops, rdev);
338 if (!rdev->rfkill) {
339 kfree(rdev);
340 return NULL;
343 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
344 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
345 INIT_WORK(&rdev->event_work, cfg80211_event_work);
347 init_waitqueue_head(&rdev->dev_wait);
350 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
351 * Fragmentation and RTS threshold are disabled by default with the
352 * special -1 value.
354 rdev->wiphy.retry_short = 7;
355 rdev->wiphy.retry_long = 4;
356 rdev->wiphy.frag_threshold = (u32) -1;
357 rdev->wiphy.rts_threshold = (u32) -1;
358 rdev->wiphy.coverage_class = 0;
360 rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
362 return &rdev->wiphy;
364 EXPORT_SYMBOL(wiphy_new);
366 static int wiphy_verify_combinations(struct wiphy *wiphy)
368 const struct ieee80211_iface_combination *c;
369 int i, j;
371 for (i = 0; i < wiphy->n_iface_combinations; i++) {
372 u32 cnt = 0;
373 u16 all_iftypes = 0;
375 c = &wiphy->iface_combinations[i];
378 * Combinations with just one interface aren't real,
379 * however we make an exception for DFS.
381 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
382 return -EINVAL;
384 /* Need at least one channel */
385 if (WARN_ON(!c->num_different_channels))
386 return -EINVAL;
389 * Put a sane limit on maximum number of different
390 * channels to simplify channel accounting code.
392 if (WARN_ON(c->num_different_channels >
393 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
394 return -EINVAL;
396 /* DFS only works on one channel. */
397 if (WARN_ON(c->radar_detect_widths &&
398 (c->num_different_channels > 1)))
399 return -EINVAL;
401 if (WARN_ON(!c->n_limits))
402 return -EINVAL;
404 for (j = 0; j < c->n_limits; j++) {
405 u16 types = c->limits[j].types;
408 * interface types shouldn't overlap, this is
409 * used in cfg80211_can_change_interface()
411 if (WARN_ON(types & all_iftypes))
412 return -EINVAL;
413 all_iftypes |= types;
415 if (WARN_ON(!c->limits[j].max))
416 return -EINVAL;
418 /* Shouldn't list software iftypes in combinations! */
419 if (WARN_ON(wiphy->software_iftypes & types))
420 return -EINVAL;
422 /* Only a single P2P_DEVICE can be allowed */
423 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
424 c->limits[j].max > 1))
425 return -EINVAL;
427 cnt += c->limits[j].max;
429 * Don't advertise an unsupported type
430 * in a combination.
432 if (WARN_ON((wiphy->interface_modes & types) != types))
433 return -EINVAL;
436 /* You can't even choose that many! */
437 if (WARN_ON(cnt < c->max_interfaces))
438 return -EINVAL;
441 return 0;
444 int wiphy_register(struct wiphy *wiphy)
446 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
447 int res;
448 enum ieee80211_band band;
449 struct ieee80211_supported_band *sband;
450 bool have_band = false;
451 int i;
452 u16 ifmodes = wiphy->interface_modes;
454 /* support for 5/10 MHz is broken due to nl80211 API mess - disable */
455 wiphy->flags &= ~WIPHY_FLAG_SUPPORTS_5_10_MHZ;
458 * There are major locking problems in nl80211/mac80211 for CSA,
459 * disable for all drivers until this has been reworked.
461 wiphy->flags &= ~WIPHY_FLAG_HAS_CHANNEL_SWITCH;
463 #ifdef CONFIG_PM
464 if (WARN_ON(wiphy->wowlan &&
465 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
466 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
467 return -EINVAL;
468 if (WARN_ON(wiphy->wowlan &&
469 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
470 !wiphy->wowlan->tcp))
471 return -EINVAL;
472 #endif
474 if (WARN_ON(wiphy->coalesce &&
475 (!wiphy->coalesce->n_rules ||
476 !wiphy->coalesce->n_patterns) &&
477 (!wiphy->coalesce->pattern_min_len ||
478 wiphy->coalesce->pattern_min_len >
479 wiphy->coalesce->pattern_max_len)))
480 return -EINVAL;
482 if (WARN_ON(wiphy->ap_sme_capa &&
483 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
484 return -EINVAL;
486 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
487 return -EINVAL;
489 if (WARN_ON(wiphy->addresses &&
490 !is_zero_ether_addr(wiphy->perm_addr) &&
491 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
492 ETH_ALEN)))
493 return -EINVAL;
495 if (WARN_ON(wiphy->max_acl_mac_addrs &&
496 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
497 !rdev->ops->set_mac_acl)))
498 return -EINVAL;
500 if (wiphy->addresses)
501 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
503 /* sanity check ifmodes */
504 WARN_ON(!ifmodes);
505 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
506 if (WARN_ON(ifmodes != wiphy->interface_modes))
507 wiphy->interface_modes = ifmodes;
509 res = wiphy_verify_combinations(wiphy);
510 if (res)
511 return res;
513 /* sanity check supported bands/channels */
514 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
515 sband = wiphy->bands[band];
516 if (!sband)
517 continue;
519 sband->band = band;
520 if (WARN_ON(!sband->n_channels))
521 return -EINVAL;
523 * on 60gHz band, there are no legacy rates, so
524 * n_bitrates is 0
526 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
527 !sband->n_bitrates))
528 return -EINVAL;
531 * Since cfg80211_disable_40mhz_24ghz is global, we can
532 * modify the sband's ht data even if the driver uses a
533 * global structure for that.
535 if (cfg80211_disable_40mhz_24ghz &&
536 band == IEEE80211_BAND_2GHZ &&
537 sband->ht_cap.ht_supported) {
538 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
539 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
543 * Since we use a u32 for rate bitmaps in
544 * ieee80211_get_response_rate, we cannot
545 * have more than 32 legacy rates.
547 if (WARN_ON(sband->n_bitrates > 32))
548 return -EINVAL;
550 for (i = 0; i < sband->n_channels; i++) {
551 sband->channels[i].orig_flags =
552 sband->channels[i].flags;
553 sband->channels[i].orig_mag = INT_MAX;
554 sband->channels[i].orig_mpwr =
555 sband->channels[i].max_power;
556 sband->channels[i].band = band;
559 have_band = true;
562 if (!have_band) {
563 WARN_ON(1);
564 return -EINVAL;
567 #ifdef CONFIG_PM
568 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
569 (!rdev->wiphy.wowlan->pattern_min_len ||
570 rdev->wiphy.wowlan->pattern_min_len >
571 rdev->wiphy.wowlan->pattern_max_len)))
572 return -EINVAL;
573 #endif
575 /* check and set up bitrates */
576 ieee80211_set_bitrate_flags(wiphy);
578 rtnl_lock();
579 res = device_add(&rdev->wiphy.dev);
580 if (res) {
581 rtnl_unlock();
582 return res;
585 /* set up regulatory info */
586 wiphy_regulatory_register(wiphy);
588 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
589 cfg80211_rdev_list_generation++;
591 /* add to debugfs */
592 rdev->wiphy.debugfsdir =
593 debugfs_create_dir(wiphy_name(&rdev->wiphy),
594 ieee80211_debugfs_dir);
595 if (IS_ERR(rdev->wiphy.debugfsdir))
596 rdev->wiphy.debugfsdir = NULL;
598 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
599 struct regulatory_request request;
601 request.wiphy_idx = get_wiphy_idx(wiphy);
602 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
603 request.alpha2[0] = '9';
604 request.alpha2[1] = '9';
606 nl80211_send_reg_change_event(&request);
609 cfg80211_debugfs_rdev_add(rdev);
611 rdev->wiphy.registered = true;
612 rtnl_unlock();
614 res = rfkill_register(rdev->rfkill);
615 if (res) {
616 rfkill_destroy(rdev->rfkill);
617 rdev->rfkill = NULL;
618 wiphy_unregister(&rdev->wiphy);
619 return res;
622 return 0;
624 EXPORT_SYMBOL(wiphy_register);
626 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
628 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
630 if (!rdev->ops->rfkill_poll)
631 return;
632 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
633 rfkill_resume_polling(rdev->rfkill);
635 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
637 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
639 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
641 rfkill_pause_polling(rdev->rfkill);
643 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
645 void wiphy_unregister(struct wiphy *wiphy)
647 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
649 wait_event(rdev->dev_wait, ({
650 int __count;
651 rtnl_lock();
652 __count = rdev->opencount;
653 rtnl_unlock();
654 __count == 0; }));
656 if (rdev->rfkill)
657 rfkill_unregister(rdev->rfkill);
659 rtnl_lock();
660 rdev->wiphy.registered = false;
662 BUG_ON(!list_empty(&rdev->wdev_list));
665 * First remove the hardware from everywhere, this makes
666 * it impossible to find from userspace.
668 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
669 list_del_rcu(&rdev->list);
670 synchronize_rcu();
673 * If this device got a regulatory hint tell core its
674 * free to listen now to a new shiny device regulatory hint
676 wiphy_regulatory_deregister(wiphy);
678 cfg80211_rdev_list_generation++;
679 device_del(&rdev->wiphy.dev);
681 rtnl_unlock();
683 flush_work(&rdev->scan_done_wk);
684 cancel_work_sync(&rdev->conn_work);
685 flush_work(&rdev->event_work);
686 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
688 #ifdef CONFIG_PM
689 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
690 rdev_set_wakeup(rdev, false);
691 #endif
692 cfg80211_rdev_free_wowlan(rdev);
693 cfg80211_rdev_free_coalesce(rdev);
695 EXPORT_SYMBOL(wiphy_unregister);
697 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
699 struct cfg80211_internal_bss *scan, *tmp;
700 struct cfg80211_beacon_registration *reg, *treg;
701 rfkill_destroy(rdev->rfkill);
702 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
703 list_del(&reg->list);
704 kfree(reg);
706 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
707 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
708 kfree(rdev);
711 void wiphy_free(struct wiphy *wiphy)
713 put_device(&wiphy->dev);
715 EXPORT_SYMBOL(wiphy_free);
717 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
719 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
721 if (rfkill_set_hw_state(rdev->rfkill, blocked))
722 schedule_work(&rdev->rfkill_sync);
724 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
726 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
728 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
730 ASSERT_RTNL();
732 if (WARN_ON(wdev->netdev))
733 return;
735 list_del_rcu(&wdev->list);
736 rdev->devlist_generation++;
738 switch (wdev->iftype) {
739 case NL80211_IFTYPE_P2P_DEVICE:
740 cfg80211_stop_p2p_device(rdev, wdev);
741 break;
742 default:
743 WARN_ON_ONCE(1);
744 break;
747 EXPORT_SYMBOL(cfg80211_unregister_wdev);
749 static struct device_type wiphy_type = {
750 .name = "wlan",
753 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
754 enum nl80211_iftype iftype, int num)
756 ASSERT_RTNL();
758 rdev->num_running_ifaces += num;
759 if (iftype == NL80211_IFTYPE_MONITOR)
760 rdev->num_running_monitor_ifaces += num;
763 void cfg80211_leave(struct cfg80211_registered_device *rdev,
764 struct wireless_dev *wdev)
766 struct net_device *dev = wdev->netdev;
768 switch (wdev->iftype) {
769 case NL80211_IFTYPE_ADHOC:
770 cfg80211_leave_ibss(rdev, dev, true);
771 break;
772 case NL80211_IFTYPE_P2P_CLIENT:
773 case NL80211_IFTYPE_STATION:
774 __cfg80211_stop_sched_scan(rdev, false);
776 wdev_lock(wdev);
777 #ifdef CONFIG_CFG80211_WEXT
778 kfree(wdev->wext.ie);
779 wdev->wext.ie = NULL;
780 wdev->wext.ie_len = 0;
781 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
782 #endif
783 cfg80211_disconnect(rdev, dev,
784 WLAN_REASON_DEAUTH_LEAVING, true);
785 wdev_unlock(wdev);
786 break;
787 case NL80211_IFTYPE_MESH_POINT:
788 cfg80211_leave_mesh(rdev, dev);
789 break;
790 case NL80211_IFTYPE_AP:
791 case NL80211_IFTYPE_P2P_GO:
792 cfg80211_stop_ap(rdev, dev);
793 break;
794 default:
795 break;
798 wdev->beacon_interval = 0;
801 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
802 unsigned long state, void *ptr)
804 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
805 struct wireless_dev *wdev = dev->ieee80211_ptr;
806 struct cfg80211_registered_device *rdev;
807 int ret;
809 if (!wdev)
810 return NOTIFY_DONE;
812 rdev = wiphy_to_dev(wdev->wiphy);
814 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
816 switch (state) {
817 case NETDEV_POST_INIT:
818 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
819 break;
820 case NETDEV_REGISTER:
822 * NB: cannot take rdev->mtx here because this may be
823 * called within code protected by it when interfaces
824 * are added with nl80211.
826 mutex_init(&wdev->mtx);
827 INIT_LIST_HEAD(&wdev->event_list);
828 spin_lock_init(&wdev->event_lock);
829 INIT_LIST_HEAD(&wdev->mgmt_registrations);
830 spin_lock_init(&wdev->mgmt_registrations_lock);
832 wdev->identifier = ++rdev->wdev_id;
833 list_add_rcu(&wdev->list, &rdev->wdev_list);
834 rdev->devlist_generation++;
835 /* can only change netns with wiphy */
836 dev->features |= NETIF_F_NETNS_LOCAL;
838 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
839 "phy80211")) {
840 pr_err("failed to add phy80211 symlink to netdev!\n");
842 wdev->netdev = dev;
843 #ifdef CONFIG_CFG80211_WEXT
844 wdev->wext.default_key = -1;
845 wdev->wext.default_mgmt_key = -1;
846 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
847 #endif
849 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
850 wdev->ps = true;
851 else
852 wdev->ps = false;
853 /* allow mac80211 to determine the timeout */
854 wdev->ps_timeout = -1;
856 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
858 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
859 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
860 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
861 dev->priv_flags |= IFF_DONT_BRIDGE;
862 break;
863 case NETDEV_GOING_DOWN:
864 cfg80211_leave(rdev, wdev);
865 break;
866 case NETDEV_DOWN:
867 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
868 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
869 if (WARN_ON(!rdev->scan_req->notified))
870 rdev->scan_req->aborted = true;
871 ___cfg80211_scan_done(rdev, true);
874 if (WARN_ON(rdev->sched_scan_req &&
875 rdev->sched_scan_req->dev == wdev->netdev)) {
876 __cfg80211_stop_sched_scan(rdev, false);
879 rdev->opencount--;
880 wake_up(&rdev->dev_wait);
881 break;
882 case NETDEV_UP:
883 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
884 wdev_lock(wdev);
885 switch (wdev->iftype) {
886 #ifdef CONFIG_CFG80211_WEXT
887 case NL80211_IFTYPE_ADHOC:
888 cfg80211_ibss_wext_join(rdev, wdev);
889 break;
890 case NL80211_IFTYPE_STATION:
891 cfg80211_mgd_wext_connect(rdev, wdev);
892 break;
893 #endif
894 #ifdef CONFIG_MAC80211_MESH
895 case NL80211_IFTYPE_MESH_POINT:
897 /* backward compat code... */
898 struct mesh_setup setup;
899 memcpy(&setup, &default_mesh_setup,
900 sizeof(setup));
901 /* back compat only needed for mesh_id */
902 setup.mesh_id = wdev->ssid;
903 setup.mesh_id_len = wdev->mesh_id_up_len;
904 if (wdev->mesh_id_up_len)
905 __cfg80211_join_mesh(rdev, dev,
906 &setup,
907 &default_mesh_config);
908 break;
910 #endif
911 default:
912 break;
914 wdev_unlock(wdev);
915 rdev->opencount++;
918 * Configure power management to the driver here so that its
919 * correctly set also after interface type changes etc.
921 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
922 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
923 rdev->ops->set_power_mgmt)
924 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
925 wdev->ps_timeout)) {
926 /* assume this means it's off */
927 wdev->ps = false;
929 break;
930 case NETDEV_UNREGISTER:
932 * It is possible to get NETDEV_UNREGISTER
933 * multiple times. To detect that, check
934 * that the interface is still on the list
935 * of registered interfaces, and only then
936 * remove and clean it up.
938 if (!list_empty(&wdev->list)) {
939 sysfs_remove_link(&dev->dev.kobj, "phy80211");
940 list_del_rcu(&wdev->list);
941 rdev->devlist_generation++;
942 cfg80211_mlme_purge_registrations(wdev);
943 #ifdef CONFIG_CFG80211_WEXT
944 kfree(wdev->wext.keys);
945 #endif
948 * synchronise (so that we won't find this netdev
949 * from other code any more) and then clear the list
950 * head so that the above code can safely check for
951 * !list_empty() to avoid double-cleanup.
953 synchronize_rcu();
954 INIT_LIST_HEAD(&wdev->list);
956 * Ensure that all events have been processed and
957 * freed.
959 cfg80211_process_wdev_events(wdev);
961 if (WARN_ON(wdev->current_bss)) {
962 cfg80211_unhold_bss(wdev->current_bss);
963 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
964 wdev->current_bss = NULL;
966 break;
967 case NETDEV_PRE_UP:
968 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
969 return notifier_from_errno(-EOPNOTSUPP);
970 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
971 if (ret)
972 return notifier_from_errno(ret);
973 break;
976 return NOTIFY_DONE;
979 static struct notifier_block cfg80211_netdev_notifier = {
980 .notifier_call = cfg80211_netdev_notifier_call,
983 static void __net_exit cfg80211_pernet_exit(struct net *net)
985 struct cfg80211_registered_device *rdev;
987 rtnl_lock();
988 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
989 if (net_eq(wiphy_net(&rdev->wiphy), net))
990 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
992 rtnl_unlock();
995 static struct pernet_operations cfg80211_pernet_ops = {
996 .exit = cfg80211_pernet_exit,
999 static int __init cfg80211_init(void)
1001 int err;
1003 err = register_pernet_device(&cfg80211_pernet_ops);
1004 if (err)
1005 goto out_fail_pernet;
1007 err = wiphy_sysfs_init();
1008 if (err)
1009 goto out_fail_sysfs;
1011 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1012 if (err)
1013 goto out_fail_notifier;
1015 err = nl80211_init();
1016 if (err)
1017 goto out_fail_nl80211;
1019 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1021 err = regulatory_init();
1022 if (err)
1023 goto out_fail_reg;
1025 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1026 if (!cfg80211_wq) {
1027 err = -ENOMEM;
1028 goto out_fail_wq;
1031 return 0;
1033 out_fail_wq:
1034 regulatory_exit();
1035 out_fail_reg:
1036 debugfs_remove(ieee80211_debugfs_dir);
1037 out_fail_nl80211:
1038 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1039 out_fail_notifier:
1040 wiphy_sysfs_exit();
1041 out_fail_sysfs:
1042 unregister_pernet_device(&cfg80211_pernet_ops);
1043 out_fail_pernet:
1044 return err;
1046 subsys_initcall(cfg80211_init);
1048 static void __exit cfg80211_exit(void)
1050 debugfs_remove(ieee80211_debugfs_dir);
1051 nl80211_exit();
1052 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1053 wiphy_sysfs_exit();
1054 regulatory_exit();
1055 unregister_pernet_device(&cfg80211_pernet_ops);
1056 destroy_workqueue(cfg80211_wq);
1058 module_exit(cfg80211_exit);