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/mutex.h>
11 #include <linux/list.h>
12 #include <linux/nl80211.h>
13 #include <linux/debugfs.h>
14 #include <linux/notifier.h>
15 #include <linux/device.h>
16 #include <net/genetlink.h>
17 #include <net/cfg80211.h>
18 #include <net/wireless.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_drv_list);
34 DEFINE_MUTEX(cfg80211_drv_mutex);
35 static int wiphy_counter;
38 static struct dentry *ieee80211_debugfs_dir;
40 /* requires cfg80211_drv_mutex to be held! */
41 static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy)
43 struct cfg80211_registered_device *result = NULL, *drv;
45 list_for_each_entry(drv, &cfg80211_drv_list, list) {
46 if (drv->idx == wiphy) {
55 /* requires cfg80211_drv_mutex to be held! */
56 static struct cfg80211_registered_device *
57 __cfg80211_drv_from_info(struct genl_info *info)
60 struct cfg80211_registered_device *bywiphy = NULL, *byifidx = NULL;
61 struct net_device *dev;
64 if (info->attrs[NL80211_ATTR_WIPHY]) {
65 bywiphy = cfg80211_drv_by_wiphy(
66 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
70 if (info->attrs[NL80211_ATTR_IFINDEX]) {
71 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
72 dev = dev_get_by_index(&init_net, ifindex);
74 if (dev->ieee80211_ptr)
76 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
82 if (bywiphy && byifidx) {
83 if (bywiphy != byifidx)
84 return ERR_PTR(-EINVAL);
86 return bywiphy; /* == byifidx */
97 struct cfg80211_registered_device *
98 cfg80211_get_dev_from_info(struct genl_info *info)
100 struct cfg80211_registered_device *drv;
102 mutex_lock(&cfg80211_drv_mutex);
103 drv = __cfg80211_drv_from_info(info);
105 /* if it is not an error we grab the lock on
106 * it to assure it won't be going away while
107 * we operate on it */
109 mutex_lock(&drv->mtx);
111 mutex_unlock(&cfg80211_drv_mutex);
116 struct cfg80211_registered_device *
117 cfg80211_get_dev_from_ifindex(int ifindex)
119 struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
120 struct net_device *dev;
122 mutex_lock(&cfg80211_drv_mutex);
123 dev = dev_get_by_index(&init_net, ifindex);
126 if (dev->ieee80211_ptr) {
127 drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
128 mutex_lock(&drv->mtx);
130 drv = ERR_PTR(-ENODEV);
133 mutex_unlock(&cfg80211_drv_mutex);
137 void cfg80211_put_dev(struct cfg80211_registered_device *drv)
140 mutex_unlock(&drv->mtx);
143 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
146 struct cfg80211_registered_device *drv;
147 int idx, taken = -1, result, digits;
149 mutex_lock(&cfg80211_drv_mutex);
151 /* prohibit calling the thing phy%d when %d is not its number */
152 sscanf(newname, PHY_NAME "%d%n", &idx, &taken);
153 if (taken == strlen(newname) && idx != rdev->idx) {
154 /* count number of places needed to print idx */
159 * deny the name if it is phy<idx> where <idx> is printed
160 * without leading zeroes. taken == strlen(newname) here
163 if (taken == strlen(PHY_NAME) + digits)
168 /* Ignore nop renames */
170 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
173 /* Ensure another device does not already have this name. */
174 list_for_each_entry(drv, &cfg80211_drv_list, list) {
176 if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
180 /* this will only check for collisions in sysfs
181 * which is not even always compiled in.
183 result = device_rename(&rdev->wiphy.dev, newname);
187 if (!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
188 rdev->wiphy.debugfsdir,
189 rdev->wiphy.debugfsdir->d_parent,
191 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
196 mutex_unlock(&cfg80211_drv_mutex);
198 nl80211_notify_dev_rename(rdev);
203 /* exported functions */
205 struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
207 struct cfg80211_registered_device *drv;
210 WARN_ON(!ops->add_key && ops->del_key);
211 WARN_ON(ops->add_key && !ops->del_key);
213 alloc_size = sizeof(*drv) + sizeof_priv;
215 drv = kzalloc(alloc_size, GFP_KERNEL);
221 mutex_lock(&cfg80211_drv_mutex);
223 drv->idx = wiphy_counter;
225 /* now increase counter for the next device unless
226 * it has wrapped previously */
227 if (wiphy_counter >= 0)
230 mutex_unlock(&cfg80211_drv_mutex);
232 if (unlikely(drv->idx < 0)) {
238 /* give it a proper name */
239 snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
240 PHY_NAME "%d", drv->idx);
242 mutex_init(&drv->mtx);
243 mutex_init(&drv->devlist_mtx);
244 INIT_LIST_HEAD(&drv->netdev_list);
246 device_initialize(&drv->wiphy.dev);
247 drv->wiphy.dev.class = &ieee80211_class;
248 drv->wiphy.dev.platform_data = drv;
252 EXPORT_SYMBOL(wiphy_new);
254 int wiphy_register(struct wiphy *wiphy)
256 struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
258 enum ieee80211_band band;
259 struct ieee80211_supported_band *sband;
260 bool have_band = false;
262 u16 ifmodes = wiphy->interface_modes;
264 /* sanity check ifmodes */
266 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
267 if (WARN_ON(ifmodes != wiphy->interface_modes))
268 wiphy->interface_modes = ifmodes;
270 /* sanity check supported bands/channels */
271 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
272 sband = wiphy->bands[band];
278 if (!sband->n_channels || !sband->n_bitrates) {
283 for (i = 0; i < sband->n_channels; i++) {
284 sband->channels[i].orig_flags =
285 sband->channels[i].flags;
286 sband->channels[i].orig_mag =
287 sband->channels[i].max_antenna_gain;
288 sband->channels[i].orig_mpwr =
289 sband->channels[i].max_power;
290 sband->channels[i].band = band;
301 /* check and set up bitrates */
302 ieee80211_set_bitrate_flags(wiphy);
304 /* set up regulatory info */
305 wiphy_update_regulatory(wiphy);
307 mutex_lock(&cfg80211_drv_mutex);
309 res = device_add(&drv->wiphy.dev);
313 list_add(&drv->list, &cfg80211_drv_list);
316 drv->wiphy.debugfsdir =
317 debugfs_create_dir(wiphy_name(&drv->wiphy),
318 ieee80211_debugfs_dir);
322 mutex_unlock(&cfg80211_drv_mutex);
325 EXPORT_SYMBOL(wiphy_register);
327 void wiphy_unregister(struct wiphy *wiphy)
329 struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
331 /* protect the device list */
332 mutex_lock(&cfg80211_drv_mutex);
334 BUG_ON(!list_empty(&drv->netdev_list));
337 * Try to grab drv->mtx. If a command is still in progress,
338 * hopefully the driver will refuse it since it's tearing
339 * down the device already. We wait for this command to complete
340 * before unlinking the item from the list.
341 * Note: as codified by the BUG_ON above we cannot get here if
342 * a virtual interface is still associated. Hence, we can only
343 * get to lock contention here if userspace issues a command
344 * that identified the hardware by wiphy index.
346 mutex_lock(&drv->mtx);
347 /* unlock again before freeing */
348 mutex_unlock(&drv->mtx);
350 list_del(&drv->list);
351 device_del(&drv->wiphy.dev);
352 debugfs_remove(drv->wiphy.debugfsdir);
354 mutex_unlock(&cfg80211_drv_mutex);
356 EXPORT_SYMBOL(wiphy_unregister);
358 void cfg80211_dev_free(struct cfg80211_registered_device *drv)
360 mutex_destroy(&drv->mtx);
361 mutex_destroy(&drv->devlist_mtx);
365 void wiphy_free(struct wiphy *wiphy)
367 put_device(&wiphy->dev);
369 EXPORT_SYMBOL(wiphy_free);
371 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
375 struct net_device *dev = ndev;
376 struct cfg80211_registered_device *rdev;
378 if (!dev->ieee80211_ptr)
381 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
384 case NETDEV_REGISTER:
385 mutex_lock(&rdev->devlist_mtx);
386 list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
387 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
389 printk(KERN_ERR "wireless: failed to add phy80211 "
390 "symlink to netdev!\n");
392 dev->ieee80211_ptr->netdev = dev;
393 mutex_unlock(&rdev->devlist_mtx);
395 case NETDEV_UNREGISTER:
396 mutex_lock(&rdev->devlist_mtx);
397 if (!list_empty(&dev->ieee80211_ptr->list)) {
398 sysfs_remove_link(&dev->dev.kobj, "phy80211");
399 list_del_init(&dev->ieee80211_ptr->list);
401 mutex_unlock(&rdev->devlist_mtx);
408 static struct notifier_block cfg80211_netdev_notifier = {
409 .notifier_call = cfg80211_netdev_notifier_call,
412 static int cfg80211_init(void)
414 int err = wiphy_sysfs_init();
418 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
420 goto out_fail_notifier;
422 err = nl80211_init();
424 goto out_fail_nl80211;
426 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
431 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
437 subsys_initcall(cfg80211_init);
439 static void cfg80211_exit(void)
441 debugfs_remove(ieee80211_debugfs_dir);
443 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
446 module_exit(cfg80211_exit);