2 * This is the linux wireless configuration interface.
4 * Copyright 2006-2008 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>
21 /* name for sysfs, %d is appended */
22 #define PHY_NAME "phy"
24 MODULE_AUTHOR("Johannes Berg");
25 MODULE_LICENSE("GPL");
26 MODULE_DESCRIPTION("wireless configuration support");
28 /* RCU might be appropriate here since we usually
29 * only read the list, and that can happen quite
30 * often because we need to do it for each command */
31 LIST_HEAD(cfg80211_drv_list
);
34 * This is used to protect the cfg80211_drv_list, cfg80211_regdomain,
35 * country_ie_regdomain, the reg_beacon_list and the the last regulatory
36 * request receipt (last_request).
38 DEFINE_MUTEX(cfg80211_mutex
);
41 static struct dentry
*ieee80211_debugfs_dir
;
43 /* requires cfg80211_mutex to be held! */
44 struct cfg80211_registered_device
*cfg80211_drv_by_wiphy_idx(int wiphy_idx
)
46 struct cfg80211_registered_device
*result
= NULL
, *drv
;
48 if (!wiphy_idx_valid(wiphy_idx
))
51 assert_cfg80211_lock();
53 list_for_each_entry(drv
, &cfg80211_drv_list
, list
) {
54 if (drv
->wiphy_idx
== wiphy_idx
) {
63 int get_wiphy_idx(struct wiphy
*wiphy
)
65 struct cfg80211_registered_device
*drv
;
67 return WIPHY_IDX_STALE
;
68 drv
= wiphy_to_dev(wiphy
);
69 return drv
->wiphy_idx
;
72 /* requires cfg80211_drv_mutex to be held! */
73 struct wiphy
*wiphy_idx_to_wiphy(int wiphy_idx
)
75 struct cfg80211_registered_device
*drv
;
77 if (!wiphy_idx_valid(wiphy_idx
))
80 assert_cfg80211_lock();
82 drv
= cfg80211_drv_by_wiphy_idx(wiphy_idx
);
88 /* requires cfg80211_mutex to be held! */
89 struct cfg80211_registered_device
*
90 __cfg80211_drv_from_info(struct genl_info
*info
)
93 struct cfg80211_registered_device
*bywiphyidx
= NULL
, *byifidx
= NULL
;
94 struct net_device
*dev
;
97 assert_cfg80211_lock();
99 if (info
->attrs
[NL80211_ATTR_WIPHY
]) {
100 bywiphyidx
= cfg80211_drv_by_wiphy_idx(
101 nla_get_u32(info
->attrs
[NL80211_ATTR_WIPHY
]));
105 if (info
->attrs
[NL80211_ATTR_IFINDEX
]) {
106 ifindex
= nla_get_u32(info
->attrs
[NL80211_ATTR_IFINDEX
]);
107 dev
= dev_get_by_index(&init_net
, ifindex
);
109 if (dev
->ieee80211_ptr
)
111 wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
117 if (bywiphyidx
&& byifidx
) {
118 if (bywiphyidx
!= byifidx
)
119 return ERR_PTR(-EINVAL
);
121 return bywiphyidx
; /* == byifidx */
132 struct cfg80211_registered_device
*
133 cfg80211_get_dev_from_info(struct genl_info
*info
)
135 struct cfg80211_registered_device
*drv
;
137 mutex_lock(&cfg80211_mutex
);
138 drv
= __cfg80211_drv_from_info(info
);
140 /* if it is not an error we grab the lock on
141 * it to assure it won't be going away while
142 * we operate on it */
144 mutex_lock(&drv
->mtx
);
146 mutex_unlock(&cfg80211_mutex
);
151 struct cfg80211_registered_device
*
152 cfg80211_get_dev_from_ifindex(int ifindex
)
154 struct cfg80211_registered_device
*drv
= ERR_PTR(-ENODEV
);
155 struct net_device
*dev
;
157 mutex_lock(&cfg80211_mutex
);
158 dev
= dev_get_by_index(&init_net
, ifindex
);
161 if (dev
->ieee80211_ptr
) {
162 drv
= wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
163 mutex_lock(&drv
->mtx
);
165 drv
= ERR_PTR(-ENODEV
);
168 mutex_unlock(&cfg80211_mutex
);
172 void cfg80211_put_dev(struct cfg80211_registered_device
*drv
)
175 mutex_unlock(&drv
->mtx
);
178 /* requires cfg80211_mutex to be held */
179 int cfg80211_dev_rename(struct cfg80211_registered_device
*rdev
,
182 struct cfg80211_registered_device
*drv
;
183 int wiphy_idx
, taken
= -1, result
, digits
;
185 assert_cfg80211_lock();
187 /* prohibit calling the thing phy%d when %d is not its number */
188 sscanf(newname
, PHY_NAME
"%d%n", &wiphy_idx
, &taken
);
189 if (taken
== strlen(newname
) && wiphy_idx
!= rdev
->wiphy_idx
) {
190 /* count number of places needed to print wiphy_idx */
192 while (wiphy_idx
/= 10)
195 * deny the name if it is phy<idx> where <idx> is printed
196 * without leading zeroes. taken == strlen(newname) here
198 if (taken
== strlen(PHY_NAME
) + digits
)
203 /* Ignore nop renames */
204 if (strcmp(newname
, dev_name(&rdev
->wiphy
.dev
)) == 0)
207 /* Ensure another device does not already have this name. */
208 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
209 if (strcmp(newname
, dev_name(&drv
->wiphy
.dev
)) == 0)
212 result
= device_rename(&rdev
->wiphy
.dev
, newname
);
216 if (rdev
->wiphy
.debugfsdir
&&
217 !debugfs_rename(rdev
->wiphy
.debugfsdir
->d_parent
,
218 rdev
->wiphy
.debugfsdir
,
219 rdev
->wiphy
.debugfsdir
->d_parent
,
221 printk(KERN_ERR
"cfg80211: failed to rename debugfs dir to %s!\n",
224 nl80211_notify_dev_rename(rdev
);
229 /* exported functions */
231 struct wiphy
*wiphy_new(struct cfg80211_ops
*ops
, int sizeof_priv
)
233 static int wiphy_counter
;
235 struct cfg80211_registered_device
*drv
;
238 WARN_ON(!ops
->add_key
&& ops
->del_key
);
239 WARN_ON(ops
->add_key
&& !ops
->del_key
);
241 alloc_size
= sizeof(*drv
) + sizeof_priv
;
243 drv
= kzalloc(alloc_size
, GFP_KERNEL
);
249 mutex_lock(&cfg80211_mutex
);
251 drv
->wiphy_idx
= wiphy_counter
++;
253 if (unlikely(!wiphy_idx_valid(drv
->wiphy_idx
))) {
255 mutex_unlock(&cfg80211_mutex
);
261 mutex_unlock(&cfg80211_mutex
);
263 /* give it a proper name */
264 dev_set_name(&drv
->wiphy
.dev
, PHY_NAME
"%d", drv
->wiphy_idx
);
266 mutex_init(&drv
->mtx
);
267 mutex_init(&drv
->devlist_mtx
);
268 INIT_LIST_HEAD(&drv
->netdev_list
);
269 spin_lock_init(&drv
->bss_lock
);
270 INIT_LIST_HEAD(&drv
->bss_list
);
272 device_initialize(&drv
->wiphy
.dev
);
273 drv
->wiphy
.dev
.class = &ieee80211_class
;
274 drv
->wiphy
.dev
.platform_data
= drv
;
277 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
278 * Fragmentation and RTS threshold are disabled by default with the
281 drv
->wiphy
.retry_short
= 7;
282 drv
->wiphy
.retry_long
= 4;
283 drv
->wiphy
.frag_threshold
= (u32
) -1;
284 drv
->wiphy
.rts_threshold
= (u32
) -1;
288 EXPORT_SYMBOL(wiphy_new
);
290 int wiphy_register(struct wiphy
*wiphy
)
292 struct cfg80211_registered_device
*drv
= wiphy_to_dev(wiphy
);
294 enum ieee80211_band band
;
295 struct ieee80211_supported_band
*sband
;
296 bool have_band
= false;
298 u16 ifmodes
= wiphy
->interface_modes
;
300 if (WARN_ON(wiphy
->max_scan_ssids
< 1))
303 /* sanity check ifmodes */
305 ifmodes
&= ((1 << __NL80211_IFTYPE_AFTER_LAST
) - 1) & ~1;
306 if (WARN_ON(ifmodes
!= wiphy
->interface_modes
))
307 wiphy
->interface_modes
= ifmodes
;
309 /* sanity check supported bands/channels */
310 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
311 sband
= wiphy
->bands
[band
];
317 if (WARN_ON(!sband
->n_channels
|| !sband
->n_bitrates
))
321 * Since we use a u32 for rate bitmaps in
322 * ieee80211_get_response_rate, we cannot
323 * have more than 32 legacy rates.
325 if (WARN_ON(sband
->n_bitrates
> 32))
328 for (i
= 0; i
< sband
->n_channels
; i
++) {
329 sband
->channels
[i
].orig_flags
=
330 sband
->channels
[i
].flags
;
331 sband
->channels
[i
].orig_mag
=
332 sband
->channels
[i
].max_antenna_gain
;
333 sband
->channels
[i
].orig_mpwr
=
334 sband
->channels
[i
].max_power
;
335 sband
->channels
[i
].band
= band
;
346 /* check and set up bitrates */
347 ieee80211_set_bitrate_flags(wiphy
);
349 mutex_lock(&cfg80211_mutex
);
351 /* set up regulatory info */
352 wiphy_update_regulatory(wiphy
, NL80211_REGDOM_SET_BY_CORE
);
354 res
= device_add(&drv
->wiphy
.dev
);
358 list_add(&drv
->list
, &cfg80211_drv_list
);
361 drv
->wiphy
.debugfsdir
=
362 debugfs_create_dir(wiphy_name(&drv
->wiphy
),
363 ieee80211_debugfs_dir
);
364 if (IS_ERR(drv
->wiphy
.debugfsdir
))
365 drv
->wiphy
.debugfsdir
= NULL
;
367 if (wiphy
->custom_regulatory
) {
368 struct regulatory_request request
;
370 request
.wiphy_idx
= get_wiphy_idx(wiphy
);
371 request
.initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
372 request
.alpha2
[0] = '9';
373 request
.alpha2
[1] = '9';
375 nl80211_send_reg_change_event(&request
);
380 mutex_unlock(&cfg80211_mutex
);
383 EXPORT_SYMBOL(wiphy_register
);
385 void wiphy_unregister(struct wiphy
*wiphy
)
387 struct cfg80211_registered_device
*drv
= wiphy_to_dev(wiphy
);
389 /* protect the device list */
390 mutex_lock(&cfg80211_mutex
);
392 BUG_ON(!list_empty(&drv
->netdev_list
));
395 * Try to grab drv->mtx. If a command is still in progress,
396 * hopefully the driver will refuse it since it's tearing
397 * down the device already. We wait for this command to complete
398 * before unlinking the item from the list.
399 * Note: as codified by the BUG_ON above we cannot get here if
400 * a virtual interface is still associated. Hence, we can only
401 * get to lock contention here if userspace issues a command
402 * that identified the hardware by wiphy index.
404 mutex_lock(&drv
->mtx
);
405 /* unlock again before freeing */
406 mutex_unlock(&drv
->mtx
);
408 /* If this device got a regulatory hint tell core its
409 * free to listen now to a new shiny device regulatory hint */
410 reg_device_remove(wiphy
);
412 list_del(&drv
->list
);
413 device_del(&drv
->wiphy
.dev
);
414 debugfs_remove(drv
->wiphy
.debugfsdir
);
416 mutex_unlock(&cfg80211_mutex
);
418 EXPORT_SYMBOL(wiphy_unregister
);
420 void cfg80211_dev_free(struct cfg80211_registered_device
*drv
)
422 struct cfg80211_internal_bss
*scan
, *tmp
;
423 mutex_destroy(&drv
->mtx
);
424 mutex_destroy(&drv
->devlist_mtx
);
425 list_for_each_entry_safe(scan
, tmp
, &drv
->bss_list
, list
)
426 cfg80211_put_bss(&scan
->pub
);
430 void wiphy_free(struct wiphy
*wiphy
)
432 put_device(&wiphy
->dev
);
434 EXPORT_SYMBOL(wiphy_free
);
436 static int cfg80211_netdev_notifier_call(struct notifier_block
* nb
,
440 struct net_device
*dev
= ndev
;
441 struct cfg80211_registered_device
*rdev
;
443 if (!dev
->ieee80211_ptr
)
446 rdev
= wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
448 WARN_ON(dev
->ieee80211_ptr
->iftype
== NL80211_IFTYPE_UNSPECIFIED
);
451 case NETDEV_REGISTER
:
452 mutex_lock(&rdev
->devlist_mtx
);
453 list_add(&dev
->ieee80211_ptr
->list
, &rdev
->netdev_list
);
454 if (sysfs_create_link(&dev
->dev
.kobj
, &rdev
->wiphy
.dev
.kobj
,
456 printk(KERN_ERR
"wireless: failed to add phy80211 "
457 "symlink to netdev!\n");
459 dev
->ieee80211_ptr
->netdev
= dev
;
460 mutex_unlock(&rdev
->devlist_mtx
);
462 case NETDEV_GOING_DOWN
:
463 if (dev
->ieee80211_ptr
->iftype
!= NL80211_IFTYPE_ADHOC
)
465 if (!dev
->ieee80211_ptr
->ssid_len
)
467 cfg80211_leave_ibss(rdev
, dev
, true);
470 #ifdef CONFIG_WIRELESS_EXT
471 if (dev
->ieee80211_ptr
->iftype
!= NL80211_IFTYPE_ADHOC
)
473 if (!dev
->ieee80211_ptr
->wext
.ssid_len
)
475 cfg80211_join_ibss(rdev
, dev
, &dev
->ieee80211_ptr
->wext
);
478 case NETDEV_UNREGISTER
:
479 mutex_lock(&rdev
->devlist_mtx
);
480 if (!list_empty(&dev
->ieee80211_ptr
->list
)) {
481 sysfs_remove_link(&dev
->dev
.kobj
, "phy80211");
482 list_del_init(&dev
->ieee80211_ptr
->list
);
484 mutex_unlock(&rdev
->devlist_mtx
);
491 static struct notifier_block cfg80211_netdev_notifier
= {
492 .notifier_call
= cfg80211_netdev_notifier_call
,
495 static int cfg80211_init(void)
499 err
= wiphy_sysfs_init();
503 err
= register_netdevice_notifier(&cfg80211_netdev_notifier
);
505 goto out_fail_notifier
;
507 err
= nl80211_init();
509 goto out_fail_nl80211
;
511 ieee80211_debugfs_dir
= debugfs_create_dir("ieee80211", NULL
);
513 err
= regulatory_init();
520 debugfs_remove(ieee80211_debugfs_dir
);
522 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
529 subsys_initcall(cfg80211_init
);
531 static void cfg80211_exit(void)
533 debugfs_remove(ieee80211_debugfs_dir
);
535 unregister_netdevice_notifier(&cfg80211_netdev_notifier
);
539 module_exit(cfg80211_exit
);