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 INIT_DELAYED_WORK(&rdev
->dfs_update_channels_wk
,
328 cfg80211_dfs_channels_update_work
);
329 #ifdef CONFIG_CFG80211_WEXT
330 rdev
->wiphy
.wext
= &cfg80211_wext_handler
;
333 device_initialize(&rdev
->wiphy
.dev
);
334 rdev
->wiphy
.dev
.class = &ieee80211_class
;
335 rdev
->wiphy
.dev
.platform_data
= rdev
;
337 #ifdef CONFIG_CFG80211_DEFAULT_PS
338 rdev
->wiphy
.flags
|= WIPHY_FLAG_PS_ON_BY_DEFAULT
;
341 wiphy_net_set(&rdev
->wiphy
, &init_net
);
343 rdev
->rfkill_ops
.set_block
= cfg80211_rfkill_set_block
;
344 rdev
->rfkill
= rfkill_alloc(dev_name(&rdev
->wiphy
.dev
),
345 &rdev
->wiphy
.dev
, RFKILL_TYPE_WLAN
,
346 &rdev
->rfkill_ops
, rdev
);
353 INIT_WORK(&rdev
->rfkill_sync
, cfg80211_rfkill_sync_work
);
354 INIT_WORK(&rdev
->conn_work
, cfg80211_conn_work
);
355 INIT_WORK(&rdev
->event_work
, cfg80211_event_work
);
357 init_waitqueue_head(&rdev
->dev_wait
);
360 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
361 * Fragmentation and RTS threshold are disabled by default with the
364 rdev
->wiphy
.retry_short
= 7;
365 rdev
->wiphy
.retry_long
= 4;
366 rdev
->wiphy
.frag_threshold
= (u32
) -1;
367 rdev
->wiphy
.rts_threshold
= (u32
) -1;
368 rdev
->wiphy
.coverage_class
= 0;
370 rdev
->wiphy
.features
= NL80211_FEATURE_SCAN_FLUSH
;
374 EXPORT_SYMBOL(wiphy_new
);
376 static int wiphy_verify_combinations(struct wiphy
*wiphy
)
378 const struct ieee80211_iface_combination
*c
;
381 for (i
= 0; i
< wiphy
->n_iface_combinations
; i
++) {
385 c
= &wiphy
->iface_combinations
[i
];
388 * Combinations with just one interface aren't real,
389 * however we make an exception for DFS.
391 if (WARN_ON((c
->max_interfaces
< 2) && !c
->radar_detect_widths
))
394 /* Need at least one channel */
395 if (WARN_ON(!c
->num_different_channels
))
399 * Put a sane limit on maximum number of different
400 * channels to simplify channel accounting code.
402 if (WARN_ON(c
->num_different_channels
>
403 CFG80211_MAX_NUM_DIFFERENT_CHANNELS
))
406 /* DFS only works on one channel. */
407 if (WARN_ON(c
->radar_detect_widths
&&
408 (c
->num_different_channels
> 1)))
411 if (WARN_ON(!c
->n_limits
))
414 for (j
= 0; j
< c
->n_limits
; j
++) {
415 u16 types
= c
->limits
[j
].types
;
418 * interface types shouldn't overlap, this is
419 * used in cfg80211_can_change_interface()
421 if (WARN_ON(types
& all_iftypes
))
423 all_iftypes
|= types
;
425 if (WARN_ON(!c
->limits
[j
].max
))
428 /* Shouldn't list software iftypes in combinations! */
429 if (WARN_ON(wiphy
->software_iftypes
& types
))
432 /* Only a single P2P_DEVICE can be allowed */
433 if (WARN_ON(types
& BIT(NL80211_IFTYPE_P2P_DEVICE
) &&
434 c
->limits
[j
].max
> 1))
437 cnt
+= c
->limits
[j
].max
;
439 * Don't advertise an unsupported type
442 if (WARN_ON((wiphy
->interface_modes
& types
) != types
))
446 /* You can't even choose that many! */
447 if (WARN_ON(cnt
< c
->max_interfaces
))
454 int wiphy_register(struct wiphy
*wiphy
)
456 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
458 enum ieee80211_band band
;
459 struct ieee80211_supported_band
*sband
;
460 bool have_band
= false;
462 u16 ifmodes
= wiphy
->interface_modes
;
465 if (WARN_ON((wiphy
->wowlan
.flags
& WIPHY_WOWLAN_GTK_REKEY_FAILURE
) &&
466 !(wiphy
->wowlan
.flags
& WIPHY_WOWLAN_SUPPORTS_GTK_REKEY
)))
470 if (WARN_ON(wiphy
->ap_sme_capa
&&
471 !(wiphy
->flags
& WIPHY_FLAG_HAVE_AP_SME
)))
474 if (WARN_ON(wiphy
->addresses
&& !wiphy
->n_addresses
))
477 if (WARN_ON(wiphy
->addresses
&&
478 !is_zero_ether_addr(wiphy
->perm_addr
) &&
479 memcmp(wiphy
->perm_addr
, wiphy
->addresses
[0].addr
,
483 if (WARN_ON(wiphy
->max_acl_mac_addrs
&&
484 (!(wiphy
->flags
& WIPHY_FLAG_HAVE_AP_SME
) ||
485 !rdev
->ops
->set_mac_acl
)))
488 if (wiphy
->addresses
)
489 memcpy(wiphy
->perm_addr
, wiphy
->addresses
[0].addr
, ETH_ALEN
);
491 /* sanity check ifmodes */
493 ifmodes
&= ((1 << NUM_NL80211_IFTYPES
) - 1) & ~1;
494 if (WARN_ON(ifmodes
!= wiphy
->interface_modes
))
495 wiphy
->interface_modes
= ifmodes
;
497 res
= wiphy_verify_combinations(wiphy
);
501 /* sanity check supported bands/channels */
502 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
503 sband
= wiphy
->bands
[band
];
508 if (WARN_ON(!sband
->n_channels
))
511 * on 60gHz band, there are no legacy rates, so
514 if (WARN_ON(band
!= IEEE80211_BAND_60GHZ
&&
519 * Since cfg80211_disable_40mhz_24ghz is global, we can
520 * modify the sband's ht data even if the driver uses a
521 * global structure for that.
523 if (cfg80211_disable_40mhz_24ghz
&&
524 band
== IEEE80211_BAND_2GHZ
&&
525 sband
->ht_cap
.ht_supported
) {
526 sband
->ht_cap
.cap
&= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40
;
527 sband
->ht_cap
.cap
&= ~IEEE80211_HT_CAP_SGI_40
;
531 * Since we use a u32 for rate bitmaps in
532 * ieee80211_get_response_rate, we cannot
533 * have more than 32 legacy rates.
535 if (WARN_ON(sband
->n_bitrates
> 32))
538 for (i
= 0; i
< sband
->n_channels
; i
++) {
539 sband
->channels
[i
].orig_flags
=
540 sband
->channels
[i
].flags
;
541 sband
->channels
[i
].orig_mag
= INT_MAX
;
542 sband
->channels
[i
].orig_mpwr
=
543 sband
->channels
[i
].max_power
;
544 sband
->channels
[i
].band
= band
;
556 if (rdev
->wiphy
.wowlan
.n_patterns
) {
557 if (WARN_ON(!rdev
->wiphy
.wowlan
.pattern_min_len
||
558 rdev
->wiphy
.wowlan
.pattern_min_len
>
559 rdev
->wiphy
.wowlan
.pattern_max_len
))
564 /* check and set up bitrates */
565 ieee80211_set_bitrate_flags(wiphy
);
567 mutex_lock(&cfg80211_mutex
);
569 res
= device_add(&rdev
->wiphy
.dev
);
571 mutex_unlock(&cfg80211_mutex
);
575 /* set up regulatory info */
576 wiphy_regulatory_register(wiphy
);
578 list_add_rcu(&rdev
->list
, &cfg80211_rdev_list
);
579 cfg80211_rdev_list_generation
++;
582 rdev
->wiphy
.debugfsdir
=
583 debugfs_create_dir(wiphy_name(&rdev
->wiphy
),
584 ieee80211_debugfs_dir
);
585 if (IS_ERR(rdev
->wiphy
.debugfsdir
))
586 rdev
->wiphy
.debugfsdir
= NULL
;
588 if (wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
) {
589 struct regulatory_request request
;
591 request
.wiphy_idx
= get_wiphy_idx(wiphy
);
592 request
.initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
593 request
.alpha2
[0] = '9';
594 request
.alpha2
[1] = '9';
596 nl80211_send_reg_change_event(&request
);
599 cfg80211_debugfs_rdev_add(rdev
);
600 mutex_unlock(&cfg80211_mutex
);
603 * due to a locking dependency this has to be outside of the
604 * cfg80211_mutex lock
606 res
= rfkill_register(rdev
->rfkill
);
611 rdev
->wiphy
.registered
= true;
616 device_del(&rdev
->wiphy
.dev
);
619 EXPORT_SYMBOL(wiphy_register
);
621 void wiphy_rfkill_start_polling(struct wiphy
*wiphy
)
623 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
625 if (!rdev
->ops
->rfkill_poll
)
627 rdev
->rfkill_ops
.poll
= cfg80211_rfkill_poll
;
628 rfkill_resume_polling(rdev
->rfkill
);
630 EXPORT_SYMBOL(wiphy_rfkill_start_polling
);
632 void wiphy_rfkill_stop_polling(struct wiphy
*wiphy
)
634 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
636 rfkill_pause_polling(rdev
->rfkill
);
638 EXPORT_SYMBOL(wiphy_rfkill_stop_polling
);
640 void wiphy_unregister(struct wiphy
*wiphy
)
642 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
645 rdev
->wiphy
.registered
= false;
648 rfkill_unregister(rdev
->rfkill
);
650 /* protect the device list */
651 mutex_lock(&cfg80211_mutex
);
653 wait_event(rdev
->dev_wait
, ({
655 mutex_lock(&rdev
->devlist_mtx
);
656 __count
= rdev
->opencount
;
657 mutex_unlock(&rdev
->devlist_mtx
);
660 mutex_lock(&rdev
->devlist_mtx
);
661 BUG_ON(!list_empty(&rdev
->wdev_list
));
662 mutex_unlock(&rdev
->devlist_mtx
);
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
);
673 * Try to grab rdev->mtx. If a command is still in progress,
674 * hopefully the driver will refuse it since it's tearing
675 * down the device already. We wait for this command to complete
676 * before unlinking the item from the list.
677 * Note: as codified by the BUG_ON above we cannot get here if
678 * a virtual interface is still present. Hence, we can only get
679 * to lock contention here if userspace issues a command that
680 * identified the hardware by wiphy index.
682 cfg80211_lock_rdev(rdev
);
684 cfg80211_unlock_rdev(rdev
);
687 * If this device got a regulatory hint tell core its
688 * free to listen now to a new shiny device regulatory hint
690 wiphy_regulatory_deregister(wiphy
);
692 cfg80211_rdev_list_generation
++;
693 device_del(&rdev
->wiphy
.dev
);
695 mutex_unlock(&cfg80211_mutex
);
697 flush_work(&rdev
->scan_done_wk
);
698 cancel_work_sync(&rdev
->conn_work
);
699 flush_work(&rdev
->event_work
);
700 cancel_delayed_work_sync(&rdev
->dfs_update_channels_wk
);
702 if (rdev
->wowlan
&& rdev
->ops
->set_wakeup
)
703 rdev_set_wakeup(rdev
, false);
704 cfg80211_rdev_free_wowlan(rdev
);
706 EXPORT_SYMBOL(wiphy_unregister
);
708 void cfg80211_dev_free(struct cfg80211_registered_device
*rdev
)
710 struct cfg80211_internal_bss
*scan
, *tmp
;
711 struct cfg80211_beacon_registration
*reg
, *treg
;
712 rfkill_destroy(rdev
->rfkill
);
713 mutex_destroy(&rdev
->mtx
);
714 mutex_destroy(&rdev
->devlist_mtx
);
715 mutex_destroy(&rdev
->sched_scan_mtx
);
716 list_for_each_entry_safe(reg
, treg
, &rdev
->beacon_registrations
, list
) {
717 list_del(®
->list
);
720 list_for_each_entry_safe(scan
, tmp
, &rdev
->bss_list
, list
)
721 cfg80211_put_bss(&rdev
->wiphy
, &scan
->pub
);
725 void wiphy_free(struct wiphy
*wiphy
)
727 put_device(&wiphy
->dev
);
729 EXPORT_SYMBOL(wiphy_free
);
731 void wiphy_rfkill_set_hw_state(struct wiphy
*wiphy
, bool blocked
)
733 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
735 if (rfkill_set_hw_state(rdev
->rfkill
, blocked
))
736 schedule_work(&rdev
->rfkill_sync
);
738 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state
);
740 static void wdev_cleanup_work(struct work_struct
*work
)
742 struct wireless_dev
*wdev
;
743 struct cfg80211_registered_device
*rdev
;
745 wdev
= container_of(work
, struct wireless_dev
, cleanup_work
);
746 rdev
= wiphy_to_dev(wdev
->wiphy
);
748 cfg80211_lock_rdev(rdev
);
750 if (WARN_ON(rdev
->scan_req
&& rdev
->scan_req
->wdev
== wdev
)) {
751 rdev
->scan_req
->aborted
= true;
752 ___cfg80211_scan_done(rdev
, true);
755 cfg80211_unlock_rdev(rdev
);
757 mutex_lock(&rdev
->sched_scan_mtx
);
759 if (WARN_ON(rdev
->sched_scan_req
&&
760 rdev
->sched_scan_req
->dev
== wdev
->netdev
)) {
761 __cfg80211_stop_sched_scan(rdev
, false);
764 mutex_unlock(&rdev
->sched_scan_mtx
);
766 mutex_lock(&rdev
->devlist_mtx
);
768 mutex_unlock(&rdev
->devlist_mtx
);
769 wake_up(&rdev
->dev_wait
);
771 dev_put(wdev
->netdev
);
774 void cfg80211_unregister_wdev(struct wireless_dev
*wdev
)
776 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wdev
->wiphy
);
780 if (WARN_ON(wdev
->netdev
))
783 mutex_lock(&rdev
->devlist_mtx
);
784 list_del_rcu(&wdev
->list
);
785 rdev
->devlist_generation
++;
787 switch (wdev
->iftype
) {
788 case NL80211_IFTYPE_P2P_DEVICE
:
789 if (!wdev
->p2p_started
)
791 rdev_stop_p2p_device(rdev
, wdev
);
792 wdev
->p2p_started
= false;
799 mutex_unlock(&rdev
->devlist_mtx
);
801 EXPORT_SYMBOL(cfg80211_unregister_wdev
);
803 static struct device_type wiphy_type
= {
807 void cfg80211_update_iface_num(struct cfg80211_registered_device
*rdev
,
808 enum nl80211_iftype iftype
, int num
)
812 rdev
->num_running_ifaces
+= num
;
813 if (iftype
== NL80211_IFTYPE_MONITOR
)
814 rdev
->num_running_monitor_ifaces
+= num
;
817 static int cfg80211_netdev_notifier_call(struct notifier_block
*nb
,
821 struct net_device
*dev
= ndev
;
822 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
823 struct cfg80211_registered_device
*rdev
;
829 rdev
= wiphy_to_dev(wdev
->wiphy
);
831 WARN_ON(wdev
->iftype
== NL80211_IFTYPE_UNSPECIFIED
);
834 case NETDEV_POST_INIT
:
835 SET_NETDEV_DEVTYPE(dev
, &wiphy_type
);
837 case NETDEV_REGISTER
:
839 * NB: cannot take rdev->mtx here because this may be
840 * called within code protected by it when interfaces
841 * are added with nl80211.
843 mutex_init(&wdev
->mtx
);
844 INIT_WORK(&wdev
->cleanup_work
, wdev_cleanup_work
);
845 INIT_LIST_HEAD(&wdev
->event_list
);
846 spin_lock_init(&wdev
->event_lock
);
847 INIT_LIST_HEAD(&wdev
->mgmt_registrations
);
848 spin_lock_init(&wdev
->mgmt_registrations_lock
);
850 mutex_lock(&rdev
->devlist_mtx
);
851 wdev
->identifier
= ++rdev
->wdev_id
;
852 list_add_rcu(&wdev
->list
, &rdev
->wdev_list
);
853 rdev
->devlist_generation
++;
854 /* can only change netns with wiphy */
855 dev
->features
|= NETIF_F_NETNS_LOCAL
;
857 if (sysfs_create_link(&dev
->dev
.kobj
, &rdev
->wiphy
.dev
.kobj
,
859 pr_err("failed to add phy80211 symlink to netdev!\n");
862 wdev
->sme_state
= CFG80211_SME_IDLE
;
863 mutex_unlock(&rdev
->devlist_mtx
);
864 #ifdef CONFIG_CFG80211_WEXT
865 wdev
->wext
.default_key
= -1;
866 wdev
->wext
.default_mgmt_key
= -1;
867 wdev
->wext
.connect
.auth_type
= NL80211_AUTHTYPE_AUTOMATIC
;
870 if (wdev
->wiphy
->flags
& WIPHY_FLAG_PS_ON_BY_DEFAULT
)
874 /* allow mac80211 to determine the timeout */
875 wdev
->ps_timeout
= -1;
877 netdev_set_default_ethtool_ops(dev
, &cfg80211_ethtool_ops
);
879 if ((wdev
->iftype
== NL80211_IFTYPE_STATION
||
880 wdev
->iftype
== NL80211_IFTYPE_P2P_CLIENT
||
881 wdev
->iftype
== NL80211_IFTYPE_ADHOC
) && !wdev
->use_4addr
)
882 dev
->priv_flags
|= IFF_DONT_BRIDGE
;
884 case NETDEV_GOING_DOWN
:
885 switch (wdev
->iftype
) {
886 case NL80211_IFTYPE_ADHOC
:
887 cfg80211_leave_ibss(rdev
, dev
, true);
889 case NL80211_IFTYPE_P2P_CLIENT
:
890 case NL80211_IFTYPE_STATION
:
891 mutex_lock(&rdev
->sched_scan_mtx
);
892 __cfg80211_stop_sched_scan(rdev
, false);
893 mutex_unlock(&rdev
->sched_scan_mtx
);
896 #ifdef CONFIG_CFG80211_WEXT
897 kfree(wdev
->wext
.ie
);
898 wdev
->wext
.ie
= NULL
;
899 wdev
->wext
.ie_len
= 0;
900 wdev
->wext
.connect
.auth_type
= NL80211_AUTHTYPE_AUTOMATIC
;
902 __cfg80211_disconnect(rdev
, dev
,
903 WLAN_REASON_DEAUTH_LEAVING
, true);
904 cfg80211_mlme_down(rdev
, dev
);
907 case NL80211_IFTYPE_MESH_POINT
:
908 cfg80211_leave_mesh(rdev
, dev
);
910 case NL80211_IFTYPE_AP
:
911 cfg80211_stop_ap(rdev
, dev
);
916 wdev
->beacon_interval
= 0;
919 cfg80211_update_iface_num(rdev
, wdev
->iftype
, -1);
921 queue_work(cfg80211_wq
, &wdev
->cleanup_work
);
925 * If we have a really quick DOWN/UP succession we may
926 * have this work still pending ... cancel it and see
927 * if it was pending, in which case we need to account
928 * for some of the work it would have done.
930 if (cancel_work_sync(&wdev
->cleanup_work
)) {
931 mutex_lock(&rdev
->devlist_mtx
);
933 mutex_unlock(&rdev
->devlist_mtx
);
936 cfg80211_update_iface_num(rdev
, wdev
->iftype
, 1);
937 cfg80211_lock_rdev(rdev
);
938 mutex_lock(&rdev
->devlist_mtx
);
940 switch (wdev
->iftype
) {
941 #ifdef CONFIG_CFG80211_WEXT
942 case NL80211_IFTYPE_ADHOC
:
943 cfg80211_ibss_wext_join(rdev
, wdev
);
945 case NL80211_IFTYPE_STATION
:
946 cfg80211_mgd_wext_connect(rdev
, wdev
);
949 #ifdef CONFIG_MAC80211_MESH
950 case NL80211_IFTYPE_MESH_POINT
:
952 /* backward compat code... */
953 struct mesh_setup setup
;
954 memcpy(&setup
, &default_mesh_setup
,
956 /* back compat only needed for mesh_id */
957 setup
.mesh_id
= wdev
->ssid
;
958 setup
.mesh_id_len
= wdev
->mesh_id_up_len
;
959 if (wdev
->mesh_id_up_len
)
960 __cfg80211_join_mesh(rdev
, dev
,
962 &default_mesh_config
);
971 mutex_unlock(&rdev
->devlist_mtx
);
972 cfg80211_unlock_rdev(rdev
);
975 * Configure power management to the driver here so that its
976 * correctly set also after interface type changes etc.
978 if ((wdev
->iftype
== NL80211_IFTYPE_STATION
||
979 wdev
->iftype
== NL80211_IFTYPE_P2P_CLIENT
) &&
980 rdev
->ops
->set_power_mgmt
)
981 if (rdev_set_power_mgmt(rdev
, dev
, wdev
->ps
,
983 /* assume this means it's off */
987 case NETDEV_UNREGISTER
:
989 * NB: cannot take rdev->mtx here because this may be
990 * called within code protected by it when interfaces
991 * are removed with nl80211.
993 mutex_lock(&rdev
->devlist_mtx
);
995 * It is possible to get NETDEV_UNREGISTER
996 * multiple times. To detect that, check
997 * that the interface is still on the list
998 * of registered interfaces, and only then
999 * remove and clean it up.
1001 if (!list_empty(&wdev
->list
)) {
1002 sysfs_remove_link(&dev
->dev
.kobj
, "phy80211");
1003 list_del_rcu(&wdev
->list
);
1004 rdev
->devlist_generation
++;
1005 cfg80211_mlme_purge_registrations(wdev
);
1006 #ifdef CONFIG_CFG80211_WEXT
1007 kfree(wdev
->wext
.keys
);
1010 mutex_unlock(&rdev
->devlist_mtx
);
1012 * synchronise (so that we won't find this netdev
1013 * from other code any more) and then clear the list
1014 * head so that the above code can safely check for
1015 * !list_empty() to avoid double-cleanup.
1018 INIT_LIST_HEAD(&wdev
->list
);
1020 * Ensure that all events have been processed and
1023 cfg80211_process_wdev_events(wdev
);
1026 if (!(wdev
->wiphy
->interface_modes
& BIT(wdev
->iftype
)))
1027 return notifier_from_errno(-EOPNOTSUPP
);
1028 if (rfkill_blocked(rdev
->rfkill
))
1029 return notifier_from_errno(-ERFKILL
);
1030 mutex_lock(&rdev
->devlist_mtx
);
1031 ret
= cfg80211_can_add_interface(rdev
, wdev
->iftype
);
1032 mutex_unlock(&rdev
->devlist_mtx
);
1034 return notifier_from_errno(ret
);
1041 static struct notifier_block cfg80211_netdev_notifier
= {
1042 .notifier_call
= cfg80211_netdev_notifier_call
,
1045 static void __net_exit
cfg80211_pernet_exit(struct net
*net
)
1047 struct cfg80211_registered_device
*rdev
;
1050 mutex_lock(&cfg80211_mutex
);
1051 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
) {
1052 if (net_eq(wiphy_net(&rdev
->wiphy
), net
))
1053 WARN_ON(cfg80211_switch_netns(rdev
, &init_net
));
1055 mutex_unlock(&cfg80211_mutex
);
1059 static struct pernet_operations cfg80211_pernet_ops
= {
1060 .exit
= cfg80211_pernet_exit
,
1063 static int __init
cfg80211_init(void)
1067 err
= register_pernet_device(&cfg80211_pernet_ops
);
1069 goto out_fail_pernet
;
1071 err
= wiphy_sysfs_init();
1073 goto out_fail_sysfs
;
1075 err
= register_netdevice_notifier(&cfg80211_netdev_notifier
);
1077 goto out_fail_notifier
;
1079 err
= nl80211_init();
1081 goto out_fail_nl80211
;
1083 ieee80211_debugfs_dir
= debugfs_create_dir("ieee80211", NULL
);
1085 err
= regulatory_init();
1089 cfg80211_wq
= create_singlethread_workqueue("cfg80211");
1098 debugfs_remove(ieee80211_debugfs_dir
);
1100 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
1104 unregister_pernet_device(&cfg80211_pernet_ops
);
1108 subsys_initcall(cfg80211_init
);
1110 static void __exit
cfg80211_exit(void)
1112 debugfs_remove(ieee80211_debugfs_dir
);
1114 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
1117 unregister_pernet_device(&cfg80211_pernet_ops
);
1118 destroy_workqueue(cfg80211_wq
);
1120 module_exit(cfg80211_exit
);