2 * This is the linux wireless configuration interface.
4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
27 #include "wext-compat.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");
38 /* RCU-protected (and cfg80211_mutex for writers) */
39 LIST_HEAD(cfg80211_rdev_list);
40 int cfg80211_rdev_list_generation;
42 DEFINE_MUTEX(cfg80211_mutex);
45 static struct dentry *ieee80211_debugfs_dir;
47 /* for the cleanup, scan and event works */
48 struct workqueue_struct *cfg80211_wq;
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");
55 /* requires cfg80211_mutex to be held! */
56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
58 struct cfg80211_registered_device *result = NULL, *rdev;
60 assert_cfg80211_lock();
62 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
63 if (rdev->wiphy_idx == wiphy_idx) {
72 int get_wiphy_idx(struct wiphy *wiphy)
74 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
76 return rdev->wiphy_idx;
79 /* requires cfg80211_rdev_mutex to be held! */
80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
82 struct cfg80211_registered_device *rdev;
84 assert_cfg80211_lock();
86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
92 struct cfg80211_registered_device *
93 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
95 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
96 struct net_device *dev;
98 mutex_lock(&cfg80211_mutex);
99 dev = dev_get_by_index(net, ifindex);
102 if (dev->ieee80211_ptr) {
103 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
104 mutex_lock(&rdev->mtx);
106 rdev = ERR_PTR(-ENODEV);
109 mutex_unlock(&cfg80211_mutex);
113 /* requires cfg80211_mutex to be held */
114 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
117 struct cfg80211_registered_device *rdev2;
118 int wiphy_idx, taken = -1, result, digits;
120 assert_cfg80211_lock();
122 /* prohibit calling the thing phy%d when %d is not its number */
123 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
124 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
125 /* count number of places needed to print wiphy_idx */
127 while (wiphy_idx /= 10)
130 * deny the name if it is phy<idx> where <idx> is printed
131 * without leading zeroes. taken == strlen(newname) here
133 if (taken == strlen(PHY_NAME) + digits)
138 /* Ignore nop renames */
139 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
142 /* Ensure another device does not already have this name. */
143 list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
144 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
147 result = device_rename(&rdev->wiphy.dev, newname);
151 if (rdev->wiphy.debugfsdir &&
152 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
153 rdev->wiphy.debugfsdir,
154 rdev->wiphy.debugfsdir->d_parent,
156 pr_err("failed to rename debugfs dir to %s!\n", newname);
158 nl80211_notify_dev_rename(rdev);
163 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
166 struct wireless_dev *wdev;
169 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
172 list_for_each_entry(wdev, &rdev->wdev_list, list) {
175 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
176 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
179 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
183 /* failed -- clean up to old netns */
184 net = wiphy_net(&rdev->wiphy);
186 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
190 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
191 err = dev_change_net_namespace(wdev->netdev, net,
194 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
200 wiphy_net_set(&rdev->wiphy, net);
202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
208 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
210 struct cfg80211_registered_device *rdev = data;
212 rdev_rfkill_poll(rdev);
215 static int cfg80211_rfkill_set_block(void *data, bool blocked)
217 struct cfg80211_registered_device *rdev = data;
218 struct wireless_dev *wdev;
224 mutex_lock(&rdev->devlist_mtx);
226 list_for_each_entry(wdev, &rdev->wdev_list, list) {
228 dev_close(wdev->netdev);
231 /* otherwise, check iftype */
232 switch (wdev->iftype) {
233 case NL80211_IFTYPE_P2P_DEVICE:
234 if (!wdev->p2p_started)
236 rdev_stop_p2p_device(rdev, wdev);
237 wdev->p2p_started = false;
245 mutex_unlock(&rdev->devlist_mtx);
251 static void cfg80211_rfkill_sync_work(struct work_struct *work)
253 struct cfg80211_registered_device *rdev;
255 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
256 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
259 static void cfg80211_event_work(struct work_struct *work)
261 struct cfg80211_registered_device *rdev;
263 rdev = container_of(work, struct cfg80211_registered_device,
267 cfg80211_lock_rdev(rdev);
269 cfg80211_process_rdev_events(rdev);
270 cfg80211_unlock_rdev(rdev);
274 /* exported functions */
276 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
278 static int wiphy_counter;
280 struct cfg80211_registered_device *rdev;
283 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
284 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
285 WARN_ON(ops->connect && !ops->disconnect);
286 WARN_ON(ops->join_ibss && !ops->leave_ibss);
287 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
288 WARN_ON(ops->add_station && !ops->del_station);
289 WARN_ON(ops->add_mpath && !ops->del_mpath);
290 WARN_ON(ops->join_mesh && !ops->leave_mesh);
292 alloc_size = sizeof(*rdev) + sizeof_priv;
294 rdev = kzalloc(alloc_size, GFP_KERNEL);
300 mutex_lock(&cfg80211_mutex);
302 rdev->wiphy_idx = wiphy_counter++;
304 if (unlikely(rdev->wiphy_idx < 0)) {
306 mutex_unlock(&cfg80211_mutex);
312 mutex_unlock(&cfg80211_mutex);
314 /* give it a proper name */
315 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
317 mutex_init(&rdev->mtx);
318 mutex_init(&rdev->devlist_mtx);
319 mutex_init(&rdev->sched_scan_mtx);
320 INIT_LIST_HEAD(&rdev->wdev_list);
321 INIT_LIST_HEAD(&rdev->beacon_registrations);
322 spin_lock_init(&rdev->beacon_registrations_lock);
323 spin_lock_init(&rdev->bss_lock);
324 INIT_LIST_HEAD(&rdev->bss_list);
325 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
326 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
327 #ifdef CONFIG_CFG80211_WEXT
328 rdev->wiphy.wext = &cfg80211_wext_handler;
331 device_initialize(&rdev->wiphy.dev);
332 rdev->wiphy.dev.class = &ieee80211_class;
333 rdev->wiphy.dev.platform_data = rdev;
335 #ifdef CONFIG_CFG80211_DEFAULT_PS
336 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
339 wiphy_net_set(&rdev->wiphy, &init_net);
341 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
342 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
343 &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
344 &rdev->rfkill_ops, rdev);
351 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
352 INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
353 INIT_WORK(&rdev->event_work, cfg80211_event_work);
355 init_waitqueue_head(&rdev->dev_wait);
358 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
359 * Fragmentation and RTS threshold are disabled by default with the
362 rdev->wiphy.retry_short = 7;
363 rdev->wiphy.retry_long = 4;
364 rdev->wiphy.frag_threshold = (u32) -1;
365 rdev->wiphy.rts_threshold = (u32) -1;
366 rdev->wiphy.coverage_class = 0;
368 rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
372 EXPORT_SYMBOL(wiphy_new);
374 static int wiphy_verify_combinations(struct wiphy *wiphy)
376 const struct ieee80211_iface_combination *c;
379 for (i = 0; i < wiphy->n_iface_combinations; i++) {
383 c = &wiphy->iface_combinations[i];
386 * Combinations with just one interface aren't real,
387 * however we make an exception for DFS.
389 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
392 /* Need at least one channel */
393 if (WARN_ON(!c->num_different_channels))
397 * Put a sane limit on maximum number of different
398 * channels to simplify channel accounting code.
400 if (WARN_ON(c->num_different_channels >
401 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
404 /* DFS only works on one channel. */
405 if (WARN_ON(c->radar_detect_widths &&
406 (c->num_different_channels > 1)))
409 if (WARN_ON(!c->n_limits))
412 for (j = 0; j < c->n_limits; j++) {
413 u16 types = c->limits[j].types;
416 * interface types shouldn't overlap, this is
417 * used in cfg80211_can_change_interface()
419 if (WARN_ON(types & all_iftypes))
421 all_iftypes |= types;
423 if (WARN_ON(!c->limits[j].max))
426 /* Shouldn't list software iftypes in combinations! */
427 if (WARN_ON(wiphy->software_iftypes & types))
430 /* Only a single P2P_DEVICE can be allowed */
431 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
432 c->limits[j].max > 1))
435 cnt += c->limits[j].max;
437 * Don't advertise an unsupported type
440 if (WARN_ON((wiphy->interface_modes & types) != types))
444 /* You can't even choose that many! */
445 if (WARN_ON(cnt < c->max_interfaces))
452 int wiphy_register(struct wiphy *wiphy)
454 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
456 enum ieee80211_band band;
457 struct ieee80211_supported_band *sband;
458 bool have_band = false;
460 u16 ifmodes = wiphy->interface_modes;
463 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
464 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
468 if (WARN_ON(wiphy->ap_sme_capa &&
469 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
472 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
475 if (WARN_ON(wiphy->addresses &&
476 !is_zero_ether_addr(wiphy->perm_addr) &&
477 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
481 if (WARN_ON(wiphy->max_acl_mac_addrs &&
482 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
483 !rdev->ops->set_mac_acl)))
486 if (wiphy->addresses)
487 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
489 /* sanity check ifmodes */
491 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
492 if (WARN_ON(ifmodes != wiphy->interface_modes))
493 wiphy->interface_modes = ifmodes;
495 res = wiphy_verify_combinations(wiphy);
499 /* sanity check supported bands/channels */
500 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
501 sband = wiphy->bands[band];
506 if (WARN_ON(!sband->n_channels))
509 * on 60gHz band, there are no legacy rates, so
512 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
517 * Since cfg80211_disable_40mhz_24ghz is global, we can
518 * modify the sband's ht data even if the driver uses a
519 * global structure for that.
521 if (cfg80211_disable_40mhz_24ghz &&
522 band == IEEE80211_BAND_2GHZ &&
523 sband->ht_cap.ht_supported) {
524 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
525 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
529 * Since we use a u32 for rate bitmaps in
530 * ieee80211_get_response_rate, we cannot
531 * have more than 32 legacy rates.
533 if (WARN_ON(sband->n_bitrates > 32))
536 for (i = 0; i < sband->n_channels; i++) {
537 sband->channels[i].orig_flags =
538 sband->channels[i].flags;
539 sband->channels[i].orig_mag = INT_MAX;
540 sband->channels[i].orig_mpwr =
541 sband->channels[i].max_power;
542 sband->channels[i].band = band;
554 if (rdev->wiphy.wowlan.n_patterns) {
555 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
556 rdev->wiphy.wowlan.pattern_min_len >
557 rdev->wiphy.wowlan.pattern_max_len))
562 /* check and set up bitrates */
563 ieee80211_set_bitrate_flags(wiphy);
565 mutex_lock(&cfg80211_mutex);
567 res = device_add(&rdev->wiphy.dev);
569 mutex_unlock(&cfg80211_mutex);
573 /* set up regulatory info */
574 wiphy_regulatory_register(wiphy);
576 list_add_rcu(&rdev->list, &cfg80211_rdev_list);
577 cfg80211_rdev_list_generation++;
580 rdev->wiphy.debugfsdir =
581 debugfs_create_dir(wiphy_name(&rdev->wiphy),
582 ieee80211_debugfs_dir);
583 if (IS_ERR(rdev->wiphy.debugfsdir))
584 rdev->wiphy.debugfsdir = NULL;
586 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
587 struct regulatory_request request;
589 request.wiphy_idx = get_wiphy_idx(wiphy);
590 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
591 request.alpha2[0] = '9';
592 request.alpha2[1] = '9';
594 nl80211_send_reg_change_event(&request);
597 cfg80211_debugfs_rdev_add(rdev);
598 mutex_unlock(&cfg80211_mutex);
601 * due to a locking dependency this has to be outside of the
602 * cfg80211_mutex lock
604 res = rfkill_register(rdev->rfkill);
609 rdev->wiphy.registered = true;
614 device_del(&rdev->wiphy.dev);
617 EXPORT_SYMBOL(wiphy_register);
619 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
621 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
623 if (!rdev->ops->rfkill_poll)
625 rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
626 rfkill_resume_polling(rdev->rfkill);
628 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
630 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
632 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
634 rfkill_pause_polling(rdev->rfkill);
636 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
638 void wiphy_unregister(struct wiphy *wiphy)
640 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
643 rdev->wiphy.registered = false;
646 rfkill_unregister(rdev->rfkill);
648 /* protect the device list */
649 mutex_lock(&cfg80211_mutex);
651 wait_event(rdev->dev_wait, ({
653 mutex_lock(&rdev->devlist_mtx);
654 __count = rdev->opencount;
655 mutex_unlock(&rdev->devlist_mtx);
658 mutex_lock(&rdev->devlist_mtx);
659 BUG_ON(!list_empty(&rdev->wdev_list));
660 mutex_unlock(&rdev->devlist_mtx);
663 * First remove the hardware from everywhere, this makes
664 * it impossible to find from userspace.
666 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
667 list_del_rcu(&rdev->list);
671 * Try to grab rdev->mtx. If a command is still in progress,
672 * hopefully the driver will refuse it since it's tearing
673 * down the device already. We wait for this command to complete
674 * before unlinking the item from the list.
675 * Note: as codified by the BUG_ON above we cannot get here if
676 * a virtual interface is still present. Hence, we can only get
677 * to lock contention here if userspace issues a command that
678 * identified the hardware by wiphy index.
680 cfg80211_lock_rdev(rdev);
682 cfg80211_unlock_rdev(rdev);
685 * If this device got a regulatory hint tell core its
686 * free to listen now to a new shiny device regulatory hint
688 wiphy_regulatory_deregister(wiphy);
690 cfg80211_rdev_list_generation++;
691 device_del(&rdev->wiphy.dev);
693 mutex_unlock(&cfg80211_mutex);
695 flush_work(&rdev->scan_done_wk);
696 cancel_work_sync(&rdev->conn_work);
697 flush_work(&rdev->event_work);
699 if (rdev->wowlan && rdev->ops->set_wakeup)
700 rdev_set_wakeup(rdev, false);
701 cfg80211_rdev_free_wowlan(rdev);
703 EXPORT_SYMBOL(wiphy_unregister);
705 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
707 struct cfg80211_internal_bss *scan, *tmp;
708 struct cfg80211_beacon_registration *reg, *treg;
709 rfkill_destroy(rdev->rfkill);
710 mutex_destroy(&rdev->mtx);
711 mutex_destroy(&rdev->devlist_mtx);
712 mutex_destroy(&rdev->sched_scan_mtx);
713 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
714 list_del(®->list);
717 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
718 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
722 void wiphy_free(struct wiphy *wiphy)
724 put_device(&wiphy->dev);
726 EXPORT_SYMBOL(wiphy_free);
728 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
730 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
732 if (rfkill_set_hw_state(rdev->rfkill, blocked))
733 schedule_work(&rdev->rfkill_sync);
735 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
737 static void wdev_cleanup_work(struct work_struct *work)
739 struct wireless_dev *wdev;
740 struct cfg80211_registered_device *rdev;
742 wdev = container_of(work, struct wireless_dev, cleanup_work);
743 rdev = wiphy_to_dev(wdev->wiphy);
745 cfg80211_lock_rdev(rdev);
747 if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
748 rdev->scan_req->aborted = true;
749 ___cfg80211_scan_done(rdev, true);
752 cfg80211_unlock_rdev(rdev);
754 mutex_lock(&rdev->sched_scan_mtx);
756 if (WARN_ON(rdev->sched_scan_req &&
757 rdev->sched_scan_req->dev == wdev->netdev)) {
758 __cfg80211_stop_sched_scan(rdev, false);
761 mutex_unlock(&rdev->sched_scan_mtx);
763 mutex_lock(&rdev->devlist_mtx);
765 mutex_unlock(&rdev->devlist_mtx);
766 wake_up(&rdev->dev_wait);
768 dev_put(wdev->netdev);
771 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
773 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
777 if (WARN_ON(wdev->netdev))
780 mutex_lock(&rdev->devlist_mtx);
781 list_del_rcu(&wdev->list);
782 rdev->devlist_generation++;
784 switch (wdev->iftype) {
785 case NL80211_IFTYPE_P2P_DEVICE:
786 if (!wdev->p2p_started)
788 rdev_stop_p2p_device(rdev, wdev);
789 wdev->p2p_started = false;
796 mutex_unlock(&rdev->devlist_mtx);
798 EXPORT_SYMBOL(cfg80211_unregister_wdev);
800 static struct device_type wiphy_type = {
804 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
805 enum nl80211_iftype iftype, int num)
809 rdev->num_running_ifaces += num;
810 if (iftype == NL80211_IFTYPE_MONITOR)
811 rdev->num_running_monitor_ifaces += num;
814 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
818 struct net_device *dev = ndev;
819 struct wireless_dev *wdev = dev->ieee80211_ptr;
820 struct cfg80211_registered_device *rdev;
826 rdev = wiphy_to_dev(wdev->wiphy);
828 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
831 case NETDEV_POST_INIT:
832 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
834 case NETDEV_REGISTER:
836 * NB: cannot take rdev->mtx here because this may be
837 * called within code protected by it when interfaces
838 * are added with nl80211.
840 mutex_init(&wdev->mtx);
841 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
842 INIT_LIST_HEAD(&wdev->event_list);
843 spin_lock_init(&wdev->event_lock);
844 INIT_LIST_HEAD(&wdev->mgmt_registrations);
845 spin_lock_init(&wdev->mgmt_registrations_lock);
847 mutex_lock(&rdev->devlist_mtx);
848 wdev->identifier = ++rdev->wdev_id;
849 list_add_rcu(&wdev->list, &rdev->wdev_list);
850 rdev->devlist_generation++;
851 /* can only change netns with wiphy */
852 dev->features |= NETIF_F_NETNS_LOCAL;
854 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
856 pr_err("failed to add phy80211 symlink to netdev!\n");
859 wdev->sme_state = CFG80211_SME_IDLE;
860 mutex_unlock(&rdev->devlist_mtx);
861 #ifdef CONFIG_CFG80211_WEXT
862 wdev->wext.default_key = -1;
863 wdev->wext.default_mgmt_key = -1;
864 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
867 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
871 /* allow mac80211 to determine the timeout */
872 wdev->ps_timeout = -1;
874 if (!dev->ethtool_ops)
875 dev->ethtool_ops = &cfg80211_ethtool_ops;
877 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
878 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
879 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
880 dev->priv_flags |= IFF_DONT_BRIDGE;
882 case NETDEV_GOING_DOWN:
883 switch (wdev->iftype) {
884 case NL80211_IFTYPE_ADHOC:
885 cfg80211_leave_ibss(rdev, dev, true);
887 case NL80211_IFTYPE_P2P_CLIENT:
888 case NL80211_IFTYPE_STATION:
889 mutex_lock(&rdev->sched_scan_mtx);
890 __cfg80211_stop_sched_scan(rdev, false);
891 mutex_unlock(&rdev->sched_scan_mtx);
894 #ifdef CONFIG_CFG80211_WEXT
895 kfree(wdev->wext.ie);
896 wdev->wext.ie = NULL;
897 wdev->wext.ie_len = 0;
898 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
900 __cfg80211_disconnect(rdev, dev,
901 WLAN_REASON_DEAUTH_LEAVING, true);
902 cfg80211_mlme_down(rdev, dev);
905 case NL80211_IFTYPE_MESH_POINT:
906 cfg80211_leave_mesh(rdev, dev);
908 case NL80211_IFTYPE_AP:
909 cfg80211_stop_ap(rdev, dev);
914 wdev->beacon_interval = 0;
917 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
919 queue_work(cfg80211_wq, &wdev->cleanup_work);
923 * If we have a really quick DOWN/UP succession we may
924 * have this work still pending ... cancel it and see
925 * if it was pending, in which case we need to account
926 * for some of the work it would have done.
928 if (cancel_work_sync(&wdev->cleanup_work)) {
929 mutex_lock(&rdev->devlist_mtx);
931 mutex_unlock(&rdev->devlist_mtx);
934 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
935 cfg80211_lock_rdev(rdev);
936 mutex_lock(&rdev->devlist_mtx);
938 switch (wdev->iftype) {
939 #ifdef CONFIG_CFG80211_WEXT
940 case NL80211_IFTYPE_ADHOC:
941 cfg80211_ibss_wext_join(rdev, wdev);
943 case NL80211_IFTYPE_STATION:
944 cfg80211_mgd_wext_connect(rdev, wdev);
947 #ifdef CONFIG_MAC80211_MESH
948 case NL80211_IFTYPE_MESH_POINT:
950 /* backward compat code... */
951 struct mesh_setup setup;
952 memcpy(&setup, &default_mesh_setup,
954 /* back compat only needed for mesh_id */
955 setup.mesh_id = wdev->ssid;
956 setup.mesh_id_len = wdev->mesh_id_up_len;
957 if (wdev->mesh_id_up_len)
958 __cfg80211_join_mesh(rdev, dev,
960 &default_mesh_config);
969 mutex_unlock(&rdev->devlist_mtx);
970 cfg80211_unlock_rdev(rdev);
973 * Configure power management to the driver here so that its
974 * correctly set also after interface type changes etc.
976 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
977 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
978 rdev->ops->set_power_mgmt)
979 if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
981 /* assume this means it's off */
985 case NETDEV_UNREGISTER:
987 * NB: cannot take rdev->mtx here because this may be
988 * called within code protected by it when interfaces
989 * are removed with nl80211.
991 mutex_lock(&rdev->devlist_mtx);
993 * It is possible to get NETDEV_UNREGISTER
994 * multiple times. To detect that, check
995 * that the interface is still on the list
996 * of registered interfaces, and only then
997 * remove and clean it up.
999 if (!list_empty(&wdev->list)) {
1000 sysfs_remove_link(&dev->dev.kobj, "phy80211");
1001 list_del_rcu(&wdev->list);
1002 rdev->devlist_generation++;
1003 cfg80211_mlme_purge_registrations(wdev);
1004 #ifdef CONFIG_CFG80211_WEXT
1005 kfree(wdev->wext.keys);
1008 mutex_unlock(&rdev->devlist_mtx);
1010 * synchronise (so that we won't find this netdev
1011 * from other code any more) and then clear the list
1012 * head so that the above code can safely check for
1013 * !list_empty() to avoid double-cleanup.
1016 INIT_LIST_HEAD(&wdev->list);
1018 * Ensure that all events have been processed and
1021 cfg80211_process_wdev_events(wdev);
1024 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1025 return notifier_from_errno(-EOPNOTSUPP);
1026 if (rfkill_blocked(rdev->rfkill))
1027 return notifier_from_errno(-ERFKILL);
1028 mutex_lock(&rdev->devlist_mtx);
1029 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
1030 mutex_unlock(&rdev->devlist_mtx);
1032 return notifier_from_errno(ret);
1039 static struct notifier_block cfg80211_netdev_notifier = {
1040 .notifier_call = cfg80211_netdev_notifier_call,
1043 static void __net_exit cfg80211_pernet_exit(struct net *net)
1045 struct cfg80211_registered_device *rdev;
1048 mutex_lock(&cfg80211_mutex);
1049 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1050 if (net_eq(wiphy_net(&rdev->wiphy), net))
1051 WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1053 mutex_unlock(&cfg80211_mutex);
1057 static struct pernet_operations cfg80211_pernet_ops = {
1058 .exit = cfg80211_pernet_exit,
1061 static int __init cfg80211_init(void)
1065 err = register_pernet_device(&cfg80211_pernet_ops);
1067 goto out_fail_pernet;
1069 err = wiphy_sysfs_init();
1071 goto out_fail_sysfs;
1073 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1075 goto out_fail_notifier;
1077 err = nl80211_init();
1079 goto out_fail_nl80211;
1081 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1083 err = regulatory_init();
1087 cfg80211_wq = create_singlethread_workqueue("cfg80211");
1096 debugfs_remove(ieee80211_debugfs_dir);
1098 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1102 unregister_pernet_device(&cfg80211_pernet_ops);
1106 subsys_initcall(cfg80211_init);
1108 static void __exit cfg80211_exit(void)
1110 debugfs_remove(ieee80211_debugfs_dir);
1112 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1115 unregister_pernet_device(&cfg80211_pernet_ops);
1116 destroy_workqueue(cfg80211_wq);
1118 module_exit(cfg80211_exit);