2 * This is the linux wireless configuration interface.
4 * Copyright 2006-2009 Johannes Berg <johannes@sipsolutions.net>
8 #include <linux/module.h>
10 #include <linux/list.h>
11 #include <linux/nl80211.h>
12 #include <linux/debugfs.h>
13 #include <linux/notifier.h>
14 #include <linux/device.h>
15 #include <linux/rtnetlink.h>
16 #include <net/genetlink.h>
17 #include <net/cfg80211.h>
23 /* name for sysfs, %d is appended */
24 #define PHY_NAME "phy"
26 MODULE_AUTHOR("Johannes Berg");
27 MODULE_LICENSE("GPL");
28 MODULE_DESCRIPTION("wireless configuration support");
30 /* RCU might be appropriate here since we usually
31 * only read the list, and that can happen quite
32 * often because we need to do it for each command */
33 LIST_HEAD(cfg80211_rdev_list
);
36 * This is used to protect the cfg80211_rdev_list, cfg80211_regdomain,
37 * country_ie_regdomain, the reg_beacon_list and the the last regulatory
38 * request receipt (last_request).
40 DEFINE_MUTEX(cfg80211_mutex
);
43 static struct dentry
*ieee80211_debugfs_dir
;
45 /* requires cfg80211_mutex to be held! */
46 struct cfg80211_registered_device
*cfg80211_rdev_by_wiphy_idx(int wiphy_idx
)
48 struct cfg80211_registered_device
*result
= NULL
, *rdev
;
50 if (!wiphy_idx_valid(wiphy_idx
))
53 assert_cfg80211_lock();
55 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
) {
56 if (rdev
->wiphy_idx
== wiphy_idx
) {
65 int get_wiphy_idx(struct wiphy
*wiphy
)
67 struct cfg80211_registered_device
*rdev
;
69 return WIPHY_IDX_STALE
;
70 rdev
= wiphy_to_dev(wiphy
);
71 return rdev
->wiphy_idx
;
74 /* requires cfg80211_rdev_mutex to be held! */
75 struct wiphy
*wiphy_idx_to_wiphy(int wiphy_idx
)
77 struct cfg80211_registered_device
*rdev
;
79 if (!wiphy_idx_valid(wiphy_idx
))
82 assert_cfg80211_lock();
84 rdev
= cfg80211_rdev_by_wiphy_idx(wiphy_idx
);
90 /* requires cfg80211_mutex to be held! */
91 struct cfg80211_registered_device
*
92 __cfg80211_rdev_from_info(struct genl_info
*info
)
95 struct cfg80211_registered_device
*bywiphyidx
= NULL
, *byifidx
= NULL
;
96 struct net_device
*dev
;
99 assert_cfg80211_lock();
101 if (info
->attrs
[NL80211_ATTR_WIPHY
]) {
102 bywiphyidx
= cfg80211_rdev_by_wiphy_idx(
103 nla_get_u32(info
->attrs
[NL80211_ATTR_WIPHY
]));
107 if (info
->attrs
[NL80211_ATTR_IFINDEX
]) {
108 ifindex
= nla_get_u32(info
->attrs
[NL80211_ATTR_IFINDEX
]);
109 dev
= dev_get_by_index(&init_net
, ifindex
);
111 if (dev
->ieee80211_ptr
)
113 wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
119 if (bywiphyidx
&& byifidx
) {
120 if (bywiphyidx
!= byifidx
)
121 return ERR_PTR(-EINVAL
);
123 return bywiphyidx
; /* == byifidx */
134 struct cfg80211_registered_device
*
135 cfg80211_get_dev_from_info(struct genl_info
*info
)
137 struct cfg80211_registered_device
*rdev
;
139 mutex_lock(&cfg80211_mutex
);
140 rdev
= __cfg80211_rdev_from_info(info
);
142 /* if it is not an error we grab the lock on
143 * it to assure it won't be going away while
144 * we operate on it */
146 mutex_lock(&rdev
->mtx
);
148 mutex_unlock(&cfg80211_mutex
);
153 struct cfg80211_registered_device
*
154 cfg80211_get_dev_from_ifindex(int ifindex
)
156 struct cfg80211_registered_device
*rdev
= ERR_PTR(-ENODEV
);
157 struct net_device
*dev
;
159 mutex_lock(&cfg80211_mutex
);
160 dev
= dev_get_by_index(&init_net
, ifindex
);
163 if (dev
->ieee80211_ptr
) {
164 rdev
= wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
165 mutex_lock(&rdev
->mtx
);
167 rdev
= ERR_PTR(-ENODEV
);
170 mutex_unlock(&cfg80211_mutex
);
174 /* requires cfg80211_mutex to be held */
175 int cfg80211_dev_rename(struct cfg80211_registered_device
*rdev
,
178 struct cfg80211_registered_device
*rdev2
;
179 int wiphy_idx
, taken
= -1, result
, digits
;
181 assert_cfg80211_lock();
183 /* prohibit calling the thing phy%d when %d is not its number */
184 sscanf(newname
, PHY_NAME
"%d%n", &wiphy_idx
, &taken
);
185 if (taken
== strlen(newname
) && wiphy_idx
!= rdev
->wiphy_idx
) {
186 /* count number of places needed to print wiphy_idx */
188 while (wiphy_idx
/= 10)
191 * deny the name if it is phy<idx> where <idx> is printed
192 * without leading zeroes. taken == strlen(newname) here
194 if (taken
== strlen(PHY_NAME
) + digits
)
199 /* Ignore nop renames */
200 if (strcmp(newname
, dev_name(&rdev
->wiphy
.dev
)) == 0)
203 /* Ensure another device does not already have this name. */
204 list_for_each_entry(rdev2
, &cfg80211_rdev_list
, list
)
205 if (strcmp(newname
, dev_name(&rdev2
->wiphy
.dev
)) == 0)
208 result
= device_rename(&rdev
->wiphy
.dev
, newname
);
212 if (rdev
->wiphy
.debugfsdir
&&
213 !debugfs_rename(rdev
->wiphy
.debugfsdir
->d_parent
,
214 rdev
->wiphy
.debugfsdir
,
215 rdev
->wiphy
.debugfsdir
->d_parent
,
217 printk(KERN_ERR
"cfg80211: failed to rename debugfs dir to %s!\n",
220 nl80211_notify_dev_rename(rdev
);
225 static void cfg80211_rfkill_poll(struct rfkill
*rfkill
, void *data
)
227 struct cfg80211_registered_device
*rdev
= data
;
229 rdev
->ops
->rfkill_poll(&rdev
->wiphy
);
232 static int cfg80211_rfkill_set_block(void *data
, bool blocked
)
234 struct cfg80211_registered_device
*rdev
= data
;
235 struct wireless_dev
*wdev
;
241 mutex_lock(&rdev
->devlist_mtx
);
243 list_for_each_entry(wdev
, &rdev
->netdev_list
, list
)
244 dev_close(wdev
->netdev
);
246 mutex_unlock(&rdev
->devlist_mtx
);
252 static void cfg80211_rfkill_sync_work(struct work_struct
*work
)
254 struct cfg80211_registered_device
*rdev
;
256 rdev
= container_of(work
, struct cfg80211_registered_device
, rfkill_sync
);
257 cfg80211_rfkill_set_block(rdev
, rfkill_blocked(rdev
->rfkill
));
260 static void cfg80211_process_events(struct wireless_dev
*wdev
)
262 struct cfg80211_event
*ev
;
265 spin_lock_irqsave(&wdev
->event_lock
, flags
);
266 while (!list_empty(&wdev
->event_list
)) {
267 ev
= list_first_entry(&wdev
->event_list
,
268 struct cfg80211_event
, list
);
270 spin_unlock_irqrestore(&wdev
->event_lock
, flags
);
274 case EVENT_CONNECT_RESULT
:
275 __cfg80211_connect_result(
276 wdev
->netdev
, ev
->cr
.bssid
,
277 ev
->cr
.req_ie
, ev
->cr
.req_ie_len
,
278 ev
->cr
.resp_ie
, ev
->cr
.resp_ie_len
,
280 ev
->cr
.status
== WLAN_STATUS_SUCCESS
);
283 __cfg80211_roamed(wdev
, ev
->rm
.bssid
,
284 ev
->rm
.req_ie
, ev
->rm
.req_ie_len
,
285 ev
->rm
.resp_ie
, ev
->rm
.resp_ie_len
);
287 case EVENT_DISCONNECTED
:
288 __cfg80211_disconnected(wdev
->netdev
,
289 ev
->dc
.ie
, ev
->dc
.ie_len
,
290 ev
->dc
.reason
, true);
292 case EVENT_IBSS_JOINED
:
293 __cfg80211_ibss_joined(wdev
->netdev
, ev
->ij
.bssid
);
300 spin_lock_irqsave(&wdev
->event_lock
, flags
);
302 spin_unlock_irqrestore(&wdev
->event_lock
, flags
);
305 static void cfg80211_event_work(struct work_struct
*work
)
307 struct cfg80211_registered_device
*rdev
;
308 struct wireless_dev
*wdev
;
310 rdev
= container_of(work
, struct cfg80211_registered_device
,
314 cfg80211_lock_rdev(rdev
);
315 mutex_lock(&rdev
->devlist_mtx
);
317 list_for_each_entry(wdev
, &rdev
->netdev_list
, list
)
318 cfg80211_process_events(wdev
);
320 mutex_unlock(&rdev
->devlist_mtx
);
321 cfg80211_unlock_rdev(rdev
);
325 /* exported functions */
327 struct wiphy
*wiphy_new(const struct cfg80211_ops
*ops
, int sizeof_priv
)
329 static int wiphy_counter
;
331 struct cfg80211_registered_device
*rdev
;
334 WARN_ON(ops
->add_key
&& (!ops
->del_key
|| !ops
->set_default_key
));
335 WARN_ON(ops
->auth
&& (!ops
->assoc
|| !ops
->deauth
|| !ops
->disassoc
));
336 WARN_ON(ops
->connect
&& !ops
->disconnect
);
337 WARN_ON(ops
->join_ibss
&& !ops
->leave_ibss
);
338 WARN_ON(ops
->add_virtual_intf
&& !ops
->del_virtual_intf
);
339 WARN_ON(ops
->add_station
&& !ops
->del_station
);
340 WARN_ON(ops
->add_mpath
&& !ops
->del_mpath
);
342 alloc_size
= sizeof(*rdev
) + sizeof_priv
;
344 rdev
= kzalloc(alloc_size
, GFP_KERNEL
);
350 mutex_lock(&cfg80211_mutex
);
352 rdev
->wiphy_idx
= wiphy_counter
++;
354 if (unlikely(!wiphy_idx_valid(rdev
->wiphy_idx
))) {
356 mutex_unlock(&cfg80211_mutex
);
362 mutex_unlock(&cfg80211_mutex
);
364 /* give it a proper name */
365 dev_set_name(&rdev
->wiphy
.dev
, PHY_NAME
"%d", rdev
->wiphy_idx
);
367 mutex_init(&rdev
->mtx
);
368 mutex_init(&rdev
->devlist_mtx
);
369 INIT_LIST_HEAD(&rdev
->netdev_list
);
370 spin_lock_init(&rdev
->bss_lock
);
371 INIT_LIST_HEAD(&rdev
->bss_list
);
372 INIT_WORK(&rdev
->scan_done_wk
, __cfg80211_scan_done
);
374 device_initialize(&rdev
->wiphy
.dev
);
375 rdev
->wiphy
.dev
.class = &ieee80211_class
;
376 rdev
->wiphy
.dev
.platform_data
= rdev
;
378 rdev
->rfkill_ops
.set_block
= cfg80211_rfkill_set_block
;
379 rdev
->rfkill
= rfkill_alloc(dev_name(&rdev
->wiphy
.dev
),
380 &rdev
->wiphy
.dev
, RFKILL_TYPE_WLAN
,
381 &rdev
->rfkill_ops
, rdev
);
388 INIT_WORK(&rdev
->rfkill_sync
, cfg80211_rfkill_sync_work
);
389 INIT_WORK(&rdev
->conn_work
, cfg80211_conn_work
);
390 INIT_WORK(&rdev
->event_work
, cfg80211_event_work
);
393 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
394 * Fragmentation and RTS threshold are disabled by default with the
397 rdev
->wiphy
.retry_short
= 7;
398 rdev
->wiphy
.retry_long
= 4;
399 rdev
->wiphy
.frag_threshold
= (u32
) -1;
400 rdev
->wiphy
.rts_threshold
= (u32
) -1;
404 EXPORT_SYMBOL(wiphy_new
);
406 int wiphy_register(struct wiphy
*wiphy
)
408 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
410 enum ieee80211_band band
;
411 struct ieee80211_supported_band
*sband
;
412 bool have_band
= false;
414 u16 ifmodes
= wiphy
->interface_modes
;
416 /* sanity check ifmodes */
418 ifmodes
&= ((1 << __NL80211_IFTYPE_AFTER_LAST
) - 1) & ~1;
419 if (WARN_ON(ifmodes
!= wiphy
->interface_modes
))
420 wiphy
->interface_modes
= ifmodes
;
422 /* sanity check supported bands/channels */
423 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
424 sband
= wiphy
->bands
[band
];
430 if (WARN_ON(!sband
->n_channels
|| !sband
->n_bitrates
))
434 * Since we use a u32 for rate bitmaps in
435 * ieee80211_get_response_rate, we cannot
436 * have more than 32 legacy rates.
438 if (WARN_ON(sband
->n_bitrates
> 32))
441 for (i
= 0; i
< sband
->n_channels
; i
++) {
442 sband
->channels
[i
].orig_flags
=
443 sband
->channels
[i
].flags
;
444 sband
->channels
[i
].orig_mag
=
445 sband
->channels
[i
].max_antenna_gain
;
446 sband
->channels
[i
].orig_mpwr
=
447 sband
->channels
[i
].max_power
;
448 sband
->channels
[i
].band
= band
;
459 /* check and set up bitrates */
460 ieee80211_set_bitrate_flags(wiphy
);
462 res
= device_add(&rdev
->wiphy
.dev
);
466 res
= rfkill_register(rdev
->rfkill
);
470 mutex_lock(&cfg80211_mutex
);
472 /* set up regulatory info */
473 wiphy_update_regulatory(wiphy
, NL80211_REGDOM_SET_BY_CORE
);
475 list_add(&rdev
->list
, &cfg80211_rdev_list
);
477 mutex_unlock(&cfg80211_mutex
);
480 rdev
->wiphy
.debugfsdir
=
481 debugfs_create_dir(wiphy_name(&rdev
->wiphy
),
482 ieee80211_debugfs_dir
);
483 if (IS_ERR(rdev
->wiphy
.debugfsdir
))
484 rdev
->wiphy
.debugfsdir
= NULL
;
486 if (wiphy
->custom_regulatory
) {
487 struct regulatory_request request
;
489 request
.wiphy_idx
= get_wiphy_idx(wiphy
);
490 request
.initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
491 request
.alpha2
[0] = '9';
492 request
.alpha2
[1] = '9';
494 nl80211_send_reg_change_event(&request
);
497 cfg80211_debugfs_rdev_add(rdev
);
502 device_del(&rdev
->wiphy
.dev
);
505 EXPORT_SYMBOL(wiphy_register
);
507 void wiphy_rfkill_start_polling(struct wiphy
*wiphy
)
509 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
511 if (!rdev
->ops
->rfkill_poll
)
513 rdev
->rfkill_ops
.poll
= cfg80211_rfkill_poll
;
514 rfkill_resume_polling(rdev
->rfkill
);
516 EXPORT_SYMBOL(wiphy_rfkill_start_polling
);
518 void wiphy_rfkill_stop_polling(struct wiphy
*wiphy
)
520 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
522 rfkill_pause_polling(rdev
->rfkill
);
524 EXPORT_SYMBOL(wiphy_rfkill_stop_polling
);
526 void wiphy_unregister(struct wiphy
*wiphy
)
528 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
530 rfkill_unregister(rdev
->rfkill
);
532 /* protect the device list */
533 mutex_lock(&cfg80211_mutex
);
535 BUG_ON(!list_empty(&rdev
->netdev_list
));
538 * Try to grab rdev->mtx. If a command is still in progress,
539 * hopefully the driver will refuse it since it's tearing
540 * down the device already. We wait for this command to complete
541 * before unlinking the item from the list.
542 * Note: as codified by the BUG_ON above we cannot get here if
543 * a virtual interface is still associated. Hence, we can only
544 * get to lock contention here if userspace issues a command
545 * that identified the hardware by wiphy index.
547 mutex_lock(&rdev
->mtx
);
548 /* unlock again before freeing */
549 mutex_unlock(&rdev
->mtx
);
551 cfg80211_debugfs_rdev_del(rdev
);
553 /* If this device got a regulatory hint tell core its
554 * free to listen now to a new shiny device regulatory hint */
555 reg_device_remove(wiphy
);
557 list_del(&rdev
->list
);
558 device_del(&rdev
->wiphy
.dev
);
559 debugfs_remove(rdev
->wiphy
.debugfsdir
);
561 mutex_unlock(&cfg80211_mutex
);
563 cancel_work_sync(&rdev
->conn_work
);
564 cancel_work_sync(&rdev
->scan_done_wk
);
565 kfree(rdev
->scan_req
);
566 flush_work(&rdev
->event_work
);
568 EXPORT_SYMBOL(wiphy_unregister
);
570 void cfg80211_dev_free(struct cfg80211_registered_device
*rdev
)
572 struct cfg80211_internal_bss
*scan
, *tmp
;
573 rfkill_destroy(rdev
->rfkill
);
574 mutex_destroy(&rdev
->mtx
);
575 mutex_destroy(&rdev
->devlist_mtx
);
576 list_for_each_entry_safe(scan
, tmp
, &rdev
->bss_list
, list
)
577 cfg80211_put_bss(&scan
->pub
);
581 void wiphy_free(struct wiphy
*wiphy
)
583 put_device(&wiphy
->dev
);
585 EXPORT_SYMBOL(wiphy_free
);
587 void wiphy_rfkill_set_hw_state(struct wiphy
*wiphy
, bool blocked
)
589 struct cfg80211_registered_device
*rdev
= wiphy_to_dev(wiphy
);
591 if (rfkill_set_hw_state(rdev
->rfkill
, blocked
))
592 schedule_work(&rdev
->rfkill_sync
);
594 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state
);
596 static int cfg80211_netdev_notifier_call(struct notifier_block
* nb
,
600 struct net_device
*dev
= ndev
;
601 struct wireless_dev
*wdev
= dev
->ieee80211_ptr
;
602 struct cfg80211_registered_device
*rdev
;
607 rdev
= wiphy_to_dev(wdev
->wiphy
);
609 WARN_ON(wdev
->iftype
== NL80211_IFTYPE_UNSPECIFIED
);
612 case NETDEV_REGISTER
:
613 mutex_init(&wdev
->mtx
);
614 INIT_LIST_HEAD(&wdev
->event_list
);
615 spin_lock_init(&wdev
->event_lock
);
616 mutex_lock(&rdev
->devlist_mtx
);
617 list_add(&wdev
->list
, &rdev
->netdev_list
);
618 if (sysfs_create_link(&dev
->dev
.kobj
, &rdev
->wiphy
.dev
.kobj
,
620 printk(KERN_ERR
"wireless: failed to add phy80211 "
621 "symlink to netdev!\n");
624 wdev
->sme_state
= CFG80211_SME_IDLE
;
625 mutex_unlock(&rdev
->devlist_mtx
);
626 #ifdef CONFIG_WIRELESS_EXT
627 wdev
->wext
.default_key
= -1;
628 wdev
->wext
.default_mgmt_key
= -1;
629 wdev
->wext
.connect
.auth_type
= NL80211_AUTHTYPE_AUTOMATIC
;
630 wdev
->wext
.ps
= CONFIG_CFG80211_DEFAULT_PS_VALUE
;
631 wdev
->wext
.ps_timeout
= 500;
632 if (rdev
->ops
->set_power_mgmt
)
633 if (rdev
->ops
->set_power_mgmt(wdev
->wiphy
, dev
,
635 wdev
->wext
.ps_timeout
)) {
636 /* assume this means it's off */
637 wdev
->wext
.ps
= false;
641 case NETDEV_GOING_DOWN
:
642 switch (wdev
->iftype
) {
643 case NL80211_IFTYPE_ADHOC
:
644 cfg80211_leave_ibss(rdev
, dev
, true);
646 case NL80211_IFTYPE_STATION
:
648 #ifdef CONFIG_WIRELESS_EXT
649 kfree(wdev
->wext
.ie
);
650 wdev
->wext
.ie
= NULL
;
651 wdev
->wext
.ie_len
= 0;
652 wdev
->wext
.connect
.auth_type
= NL80211_AUTHTYPE_AUTOMATIC
;
654 __cfg80211_disconnect(rdev
, dev
,
655 WLAN_REASON_DEAUTH_LEAVING
, true);
656 cfg80211_mlme_down(rdev
, dev
);
664 #ifdef CONFIG_WIRELESS_EXT
665 cfg80211_lock_rdev(rdev
);
667 switch (wdev
->iftype
) {
668 case NL80211_IFTYPE_ADHOC
:
669 cfg80211_ibss_wext_join(rdev
, wdev
);
671 case NL80211_IFTYPE_STATION
:
672 cfg80211_mgd_wext_connect(rdev
, wdev
);
678 cfg80211_unlock_rdev(rdev
);
681 case NETDEV_UNREGISTER
:
682 mutex_lock(&rdev
->devlist_mtx
);
683 if (!list_empty(&wdev
->list
)) {
684 sysfs_remove_link(&dev
->dev
.kobj
, "phy80211");
685 list_del_init(&wdev
->list
);
687 mutex_unlock(&rdev
->devlist_mtx
);
688 mutex_destroy(&wdev
->mtx
);
689 #ifdef CONFIG_WIRELESS_EXT
690 kfree(wdev
->wext
.keys
);
694 if (!(wdev
->wiphy
->interface_modes
& BIT(wdev
->iftype
)))
695 return notifier_from_errno(-EOPNOTSUPP
);
696 if (rfkill_blocked(rdev
->rfkill
))
697 return notifier_from_errno(-ERFKILL
);
704 static struct notifier_block cfg80211_netdev_notifier
= {
705 .notifier_call
= cfg80211_netdev_notifier_call
,
708 static int cfg80211_init(void)
712 err
= wiphy_sysfs_init();
716 err
= register_netdevice_notifier(&cfg80211_netdev_notifier
);
718 goto out_fail_notifier
;
720 err
= nl80211_init();
722 goto out_fail_nl80211
;
724 ieee80211_debugfs_dir
= debugfs_create_dir("ieee80211", NULL
);
726 err
= regulatory_init();
733 debugfs_remove(ieee80211_debugfs_dir
);
735 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
742 subsys_initcall(cfg80211_init
);
744 static void cfg80211_exit(void)
746 debugfs_remove(ieee80211_debugfs_dir
);
748 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
752 module_exit(cfg80211_exit
);