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 <net/genetlink.h>
16 #include <net/cfg80211.h>
22 /* name for sysfs, %d is appended */
23 #define PHY_NAME "phy"
25 MODULE_AUTHOR("Johannes Berg");
26 MODULE_LICENSE("GPL");
27 MODULE_DESCRIPTION("wireless configuration support");
29 /* RCU might be appropriate here since we usually
30 * only read the list, and that can happen quite
31 * often because we need to do it for each command */
32 LIST_HEAD(cfg80211_drv_list
);
35 * This is used to protect the cfg80211_drv_list, cfg80211_regdomain,
36 * country_ie_regdomain, the reg_beacon_list and the the last regulatory
37 * request receipt (last_request).
39 DEFINE_MUTEX(cfg80211_mutex
);
42 static struct dentry
*ieee80211_debugfs_dir
;
44 /* requires cfg80211_mutex to be held! */
45 struct cfg80211_registered_device
*cfg80211_drv_by_wiphy_idx(int wiphy_idx
)
47 struct cfg80211_registered_device
*result
= NULL
, *drv
;
49 if (!wiphy_idx_valid(wiphy_idx
))
52 assert_cfg80211_lock();
54 list_for_each_entry(drv
, &cfg80211_drv_list
, list
) {
55 if (drv
->wiphy_idx
== wiphy_idx
) {
64 int get_wiphy_idx(struct wiphy
*wiphy
)
66 struct cfg80211_registered_device
*drv
;
68 return WIPHY_IDX_STALE
;
69 drv
= wiphy_to_dev(wiphy
);
70 return drv
->wiphy_idx
;
73 /* requires cfg80211_drv_mutex to be held! */
74 struct wiphy
*wiphy_idx_to_wiphy(int wiphy_idx
)
76 struct cfg80211_registered_device
*drv
;
78 if (!wiphy_idx_valid(wiphy_idx
))
81 assert_cfg80211_lock();
83 drv
= cfg80211_drv_by_wiphy_idx(wiphy_idx
);
89 /* requires cfg80211_mutex to be held! */
90 struct cfg80211_registered_device
*
91 __cfg80211_drv_from_info(struct genl_info
*info
)
94 struct cfg80211_registered_device
*bywiphyidx
= NULL
, *byifidx
= NULL
;
95 struct net_device
*dev
;
98 assert_cfg80211_lock();
100 if (info
->attrs
[NL80211_ATTR_WIPHY
]) {
101 bywiphyidx
= cfg80211_drv_by_wiphy_idx(
102 nla_get_u32(info
->attrs
[NL80211_ATTR_WIPHY
]));
106 if (info
->attrs
[NL80211_ATTR_IFINDEX
]) {
107 ifindex
= nla_get_u32(info
->attrs
[NL80211_ATTR_IFINDEX
]);
108 dev
= dev_get_by_index(&init_net
, ifindex
);
110 if (dev
->ieee80211_ptr
)
112 wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
118 if (bywiphyidx
&& byifidx
) {
119 if (bywiphyidx
!= byifidx
)
120 return ERR_PTR(-EINVAL
);
122 return bywiphyidx
; /* == byifidx */
133 struct cfg80211_registered_device
*
134 cfg80211_get_dev_from_info(struct genl_info
*info
)
136 struct cfg80211_registered_device
*drv
;
138 mutex_lock(&cfg80211_mutex
);
139 drv
= __cfg80211_drv_from_info(info
);
141 /* if it is not an error we grab the lock on
142 * it to assure it won't be going away while
143 * we operate on it */
145 mutex_lock(&drv
->mtx
);
147 mutex_unlock(&cfg80211_mutex
);
152 struct cfg80211_registered_device
*
153 cfg80211_get_dev_from_ifindex(int ifindex
)
155 struct cfg80211_registered_device
*drv
= ERR_PTR(-ENODEV
);
156 struct net_device
*dev
;
158 mutex_lock(&cfg80211_mutex
);
159 dev
= dev_get_by_index(&init_net
, ifindex
);
162 if (dev
->ieee80211_ptr
) {
163 drv
= wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
164 mutex_lock(&drv
->mtx
);
166 drv
= ERR_PTR(-ENODEV
);
169 mutex_unlock(&cfg80211_mutex
);
173 void cfg80211_put_dev(struct cfg80211_registered_device
*drv
)
176 mutex_unlock(&drv
->mtx
);
179 /* requires cfg80211_mutex to be held */
180 int cfg80211_dev_rename(struct cfg80211_registered_device
*rdev
,
183 struct cfg80211_registered_device
*drv
;
184 int wiphy_idx
, taken
= -1, result
, digits
;
186 assert_cfg80211_lock();
188 /* prohibit calling the thing phy%d when %d is not its number */
189 sscanf(newname
, PHY_NAME
"%d%n", &wiphy_idx
, &taken
);
190 if (taken
== strlen(newname
) && wiphy_idx
!= rdev
->wiphy_idx
) {
191 /* count number of places needed to print wiphy_idx */
193 while (wiphy_idx
/= 10)
196 * deny the name if it is phy<idx> where <idx> is printed
197 * without leading zeroes. taken == strlen(newname) here
199 if (taken
== strlen(PHY_NAME
) + digits
)
204 /* Ignore nop renames */
205 if (strcmp(newname
, dev_name(&rdev
->wiphy
.dev
)) == 0)
208 /* Ensure another device does not already have this name. */
209 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
210 if (strcmp(newname
, dev_name(&drv
->wiphy
.dev
)) == 0)
213 result
= device_rename(&rdev
->wiphy
.dev
, newname
);
217 if (rdev
->wiphy
.debugfsdir
&&
218 !debugfs_rename(rdev
->wiphy
.debugfsdir
->d_parent
,
219 rdev
->wiphy
.debugfsdir
,
220 rdev
->wiphy
.debugfsdir
->d_parent
,
222 printk(KERN_ERR
"cfg80211: failed to rename debugfs dir to %s!\n",
225 nl80211_notify_dev_rename(rdev
);
230 /* exported functions */
232 struct wiphy
*wiphy_new(struct cfg80211_ops
*ops
, int sizeof_priv
)
234 static int wiphy_counter
;
236 struct cfg80211_registered_device
*drv
;
239 WARN_ON(!ops
->add_key
&& ops
->del_key
);
240 WARN_ON(ops
->add_key
&& !ops
->del_key
);
242 alloc_size
= sizeof(*drv
) + sizeof_priv
;
244 drv
= kzalloc(alloc_size
, GFP_KERNEL
);
250 mutex_lock(&cfg80211_mutex
);
252 drv
->wiphy_idx
= wiphy_counter
++;
254 if (unlikely(!wiphy_idx_valid(drv
->wiphy_idx
))) {
256 mutex_unlock(&cfg80211_mutex
);
262 mutex_unlock(&cfg80211_mutex
);
264 /* give it a proper name */
265 dev_set_name(&drv
->wiphy
.dev
, PHY_NAME
"%d", drv
->wiphy_idx
);
267 mutex_init(&drv
->mtx
);
268 mutex_init(&drv
->devlist_mtx
);
269 INIT_LIST_HEAD(&drv
->netdev_list
);
270 spin_lock_init(&drv
->bss_lock
);
271 INIT_LIST_HEAD(&drv
->bss_list
);
273 device_initialize(&drv
->wiphy
.dev
);
274 drv
->wiphy
.dev
.class = &ieee80211_class
;
275 drv
->wiphy
.dev
.platform_data
= drv
;
278 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
279 * Fragmentation and RTS threshold are disabled by default with the
282 drv
->wiphy
.retry_short
= 7;
283 drv
->wiphy
.retry_long
= 4;
284 drv
->wiphy
.frag_threshold
= (u32
) -1;
285 drv
->wiphy
.rts_threshold
= (u32
) -1;
289 EXPORT_SYMBOL(wiphy_new
);
291 int wiphy_register(struct wiphy
*wiphy
)
293 struct cfg80211_registered_device
*drv
= wiphy_to_dev(wiphy
);
295 enum ieee80211_band band
;
296 struct ieee80211_supported_band
*sband
;
297 bool have_band
= false;
299 u16 ifmodes
= wiphy
->interface_modes
;
301 if (WARN_ON(wiphy
->max_scan_ssids
< 1))
304 /* sanity check ifmodes */
306 ifmodes
&= ((1 << __NL80211_IFTYPE_AFTER_LAST
) - 1) & ~1;
307 if (WARN_ON(ifmodes
!= wiphy
->interface_modes
))
308 wiphy
->interface_modes
= ifmodes
;
310 /* sanity check supported bands/channels */
311 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
312 sband
= wiphy
->bands
[band
];
318 if (WARN_ON(!sband
->n_channels
|| !sband
->n_bitrates
))
322 * Since we use a u32 for rate bitmaps in
323 * ieee80211_get_response_rate, we cannot
324 * have more than 32 legacy rates.
326 if (WARN_ON(sband
->n_bitrates
> 32))
329 for (i
= 0; i
< sband
->n_channels
; i
++) {
330 sband
->channels
[i
].orig_flags
=
331 sband
->channels
[i
].flags
;
332 sband
->channels
[i
].orig_mag
=
333 sband
->channels
[i
].max_antenna_gain
;
334 sband
->channels
[i
].orig_mpwr
=
335 sband
->channels
[i
].max_power
;
336 sband
->channels
[i
].band
= band
;
347 /* check and set up bitrates */
348 ieee80211_set_bitrate_flags(wiphy
);
350 mutex_lock(&cfg80211_mutex
);
352 /* set up regulatory info */
353 wiphy_update_regulatory(wiphy
, NL80211_REGDOM_SET_BY_CORE
);
355 res
= device_add(&drv
->wiphy
.dev
);
359 list_add(&drv
->list
, &cfg80211_drv_list
);
362 drv
->wiphy
.debugfsdir
=
363 debugfs_create_dir(wiphy_name(&drv
->wiphy
),
364 ieee80211_debugfs_dir
);
365 if (IS_ERR(drv
->wiphy
.debugfsdir
))
366 drv
->wiphy
.debugfsdir
= NULL
;
368 if (wiphy
->custom_regulatory
) {
369 struct regulatory_request request
;
371 request
.wiphy_idx
= get_wiphy_idx(wiphy
);
372 request
.initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
373 request
.alpha2
[0] = '9';
374 request
.alpha2
[1] = '9';
376 nl80211_send_reg_change_event(&request
);
379 cfg80211_debugfs_drv_add(drv
);
383 mutex_unlock(&cfg80211_mutex
);
386 EXPORT_SYMBOL(wiphy_register
);
388 void wiphy_unregister(struct wiphy
*wiphy
)
390 struct cfg80211_registered_device
*drv
= wiphy_to_dev(wiphy
);
392 /* protect the device list */
393 mutex_lock(&cfg80211_mutex
);
395 BUG_ON(!list_empty(&drv
->netdev_list
));
398 * Try to grab drv->mtx. If a command is still in progress,
399 * hopefully the driver will refuse it since it's tearing
400 * down the device already. We wait for this command to complete
401 * before unlinking the item from the list.
402 * Note: as codified by the BUG_ON above we cannot get here if
403 * a virtual interface is still associated. Hence, we can only
404 * get to lock contention here if userspace issues a command
405 * that identified the hardware by wiphy index.
407 mutex_lock(&drv
->mtx
);
408 /* unlock again before freeing */
409 mutex_unlock(&drv
->mtx
);
411 cfg80211_debugfs_drv_del(drv
);
413 /* If this device got a regulatory hint tell core its
414 * free to listen now to a new shiny device regulatory hint */
415 reg_device_remove(wiphy
);
417 list_del(&drv
->list
);
418 device_del(&drv
->wiphy
.dev
);
419 debugfs_remove(drv
->wiphy
.debugfsdir
);
421 mutex_unlock(&cfg80211_mutex
);
423 EXPORT_SYMBOL(wiphy_unregister
);
425 void cfg80211_dev_free(struct cfg80211_registered_device
*drv
)
427 struct cfg80211_internal_bss
*scan
, *tmp
;
428 mutex_destroy(&drv
->mtx
);
429 mutex_destroy(&drv
->devlist_mtx
);
430 list_for_each_entry_safe(scan
, tmp
, &drv
->bss_list
, list
)
431 cfg80211_put_bss(&scan
->pub
);
435 void wiphy_free(struct wiphy
*wiphy
)
437 put_device(&wiphy
->dev
);
439 EXPORT_SYMBOL(wiphy_free
);
441 static int cfg80211_netdev_notifier_call(struct notifier_block
* nb
,
445 struct net_device
*dev
= ndev
;
446 struct cfg80211_registered_device
*rdev
;
448 if (!dev
->ieee80211_ptr
)
451 rdev
= wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
453 WARN_ON(dev
->ieee80211_ptr
->iftype
== NL80211_IFTYPE_UNSPECIFIED
);
456 case NETDEV_REGISTER
:
457 mutex_lock(&rdev
->devlist_mtx
);
458 list_add(&dev
->ieee80211_ptr
->list
, &rdev
->netdev_list
);
459 if (sysfs_create_link(&dev
->dev
.kobj
, &rdev
->wiphy
.dev
.kobj
,
461 printk(KERN_ERR
"wireless: failed to add phy80211 "
462 "symlink to netdev!\n");
464 dev
->ieee80211_ptr
->netdev
= dev
;
465 #ifdef CONFIG_WIRELESS_EXT
466 dev
->ieee80211_ptr
->wext
.default_key
= -1;
467 dev
->ieee80211_ptr
->wext
.default_mgmt_key
= -1;
469 mutex_unlock(&rdev
->devlist_mtx
);
471 case NETDEV_GOING_DOWN
:
472 if (dev
->ieee80211_ptr
->iftype
!= NL80211_IFTYPE_ADHOC
)
474 if (!dev
->ieee80211_ptr
->ssid_len
)
476 cfg80211_leave_ibss(rdev
, dev
, true);
479 #ifdef CONFIG_WIRELESS_EXT
480 if (dev
->ieee80211_ptr
->iftype
!= NL80211_IFTYPE_ADHOC
)
482 if (!dev
->ieee80211_ptr
->wext
.ibss
.ssid_len
)
484 cfg80211_join_ibss(rdev
, dev
, &dev
->ieee80211_ptr
->wext
.ibss
);
487 case NETDEV_UNREGISTER
:
488 mutex_lock(&rdev
->devlist_mtx
);
489 if (!list_empty(&dev
->ieee80211_ptr
->list
)) {
490 sysfs_remove_link(&dev
->dev
.kobj
, "phy80211");
491 list_del_init(&dev
->ieee80211_ptr
->list
);
493 mutex_unlock(&rdev
->devlist_mtx
);
500 static struct notifier_block cfg80211_netdev_notifier
= {
501 .notifier_call
= cfg80211_netdev_notifier_call
,
504 static int cfg80211_init(void)
508 err
= wiphy_sysfs_init();
512 err
= register_netdevice_notifier(&cfg80211_netdev_notifier
);
514 goto out_fail_notifier
;
516 err
= nl80211_init();
518 goto out_fail_nl80211
;
520 ieee80211_debugfs_dir
= debugfs_create_dir("ieee80211", NULL
);
522 err
= regulatory_init();
529 debugfs_remove(ieee80211_debugfs_dir
);
531 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
538 subsys_initcall(cfg80211_init
);
540 static void cfg80211_exit(void)
542 debugfs_remove(ieee80211_debugfs_dir
);
544 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
548 module_exit(cfg80211_exit
);