Commit | Line | Data |
---|---|---|
704232c2 JB |
1 | /* |
2 | * This is the linux wireless configuration interface. | |
3 | * | |
4 | * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net> | |
5 | */ | |
6 | ||
7 | #include <linux/if.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/err.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> | |
55682965 | 19 | #include "nl80211.h" |
704232c2 JB |
20 | #include "core.h" |
21 | #include "sysfs.h" | |
22 | ||
23 | /* name for sysfs, %d is appended */ | |
24 | #define PHY_NAME "phy" | |
25 | ||
26 | MODULE_AUTHOR("Johannes Berg"); | |
27 | MODULE_LICENSE("GPL"); | |
28 | MODULE_DESCRIPTION("wireless configuration support"); | |
29 | ||
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; | |
36 | ||
37 | /* for debugfs */ | |
38 | static struct dentry *ieee80211_debugfs_dir; | |
39 | ||
55682965 JB |
40 | /* requires cfg80211_drv_mutex to be held! */ |
41 | static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy) | |
42 | { | |
43 | struct cfg80211_registered_device *result = NULL, *drv; | |
44 | ||
45 | list_for_each_entry(drv, &cfg80211_drv_list, list) { | |
46 | if (drv->idx == wiphy) { | |
47 | result = drv; | |
48 | break; | |
49 | } | |
50 | } | |
51 | ||
52 | return result; | |
53 | } | |
54 | ||
55 | /* requires cfg80211_drv_mutex to be held! */ | |
56 | static struct cfg80211_registered_device * | |
57 | __cfg80211_drv_from_info(struct genl_info *info) | |
58 | { | |
59 | int ifindex; | |
60 | struct cfg80211_registered_device *bywiphy = NULL, *byifidx = NULL; | |
61 | struct net_device *dev; | |
62 | int err = -EINVAL; | |
63 | ||
64 | if (info->attrs[NL80211_ATTR_WIPHY]) { | |
65 | bywiphy = cfg80211_drv_by_wiphy( | |
66 | nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); | |
67 | err = -ENODEV; | |
68 | } | |
69 | ||
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); | |
73 | if (dev) { | |
74 | if (dev->ieee80211_ptr) | |
75 | byifidx = | |
76 | wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
77 | dev_put(dev); | |
78 | } | |
79 | err = -ENODEV; | |
80 | } | |
81 | ||
82 | if (bywiphy && byifidx) { | |
83 | if (bywiphy != byifidx) | |
84 | return ERR_PTR(-EINVAL); | |
85 | else | |
86 | return bywiphy; /* == byifidx */ | |
87 | } | |
88 | if (bywiphy) | |
89 | return bywiphy; | |
90 | ||
91 | if (byifidx) | |
92 | return byifidx; | |
93 | ||
94 | return ERR_PTR(err); | |
95 | } | |
96 | ||
97 | struct cfg80211_registered_device * | |
98 | cfg80211_get_dev_from_info(struct genl_info *info) | |
99 | { | |
100 | struct cfg80211_registered_device *drv; | |
101 | ||
102 | mutex_lock(&cfg80211_drv_mutex); | |
103 | drv = __cfg80211_drv_from_info(info); | |
104 | ||
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 */ | |
108 | if (!IS_ERR(drv)) | |
109 | mutex_lock(&drv->mtx); | |
110 | ||
111 | mutex_unlock(&cfg80211_drv_mutex); | |
112 | ||
113 | return drv; | |
114 | } | |
115 | ||
116 | struct cfg80211_registered_device * | |
117 | cfg80211_get_dev_from_ifindex(int ifindex) | |
118 | { | |
119 | struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV); | |
120 | struct net_device *dev; | |
121 | ||
122 | mutex_lock(&cfg80211_drv_mutex); | |
123 | dev = dev_get_by_index(&init_net, ifindex); | |
124 | if (!dev) | |
125 | goto out; | |
126 | if (dev->ieee80211_ptr) { | |
127 | drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
128 | mutex_lock(&drv->mtx); | |
129 | } else | |
130 | drv = ERR_PTR(-ENODEV); | |
131 | dev_put(dev); | |
132 | out: | |
133 | mutex_unlock(&cfg80211_drv_mutex); | |
134 | return drv; | |
135 | } | |
136 | ||
137 | void cfg80211_put_dev(struct cfg80211_registered_device *drv) | |
138 | { | |
139 | BUG_ON(IS_ERR(drv)); | |
140 | mutex_unlock(&drv->mtx); | |
141 | } | |
142 | ||
143 | int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, | |
144 | char *newname) | |
145 | { | |
146 | int idx, taken = -1, result, digits; | |
147 | ||
148 | /* prohibit calling the thing phy%d when %d is not its number */ | |
149 | sscanf(newname, PHY_NAME "%d%n", &idx, &taken); | |
150 | if (taken == strlen(newname) && idx != rdev->idx) { | |
151 | /* count number of places needed to print idx */ | |
152 | digits = 1; | |
153 | while (idx /= 10) | |
154 | digits++; | |
155 | /* | |
156 | * deny the name if it is phy<idx> where <idx> is printed | |
157 | * without leading zeroes. taken == strlen(newname) here | |
158 | */ | |
159 | if (taken == strlen(PHY_NAME) + digits) | |
160 | return -EINVAL; | |
161 | } | |
162 | ||
163 | /* this will check for collisions */ | |
164 | result = device_rename(&rdev->wiphy.dev, newname); | |
165 | if (result) | |
166 | return result; | |
167 | ||
168 | if (!debugfs_rename(rdev->wiphy.debugfsdir->d_parent, | |
169 | rdev->wiphy.debugfsdir, | |
170 | rdev->wiphy.debugfsdir->d_parent, | |
171 | newname)) | |
172 | printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", | |
173 | newname); | |
174 | ||
175 | nl80211_notify_dev_rename(rdev); | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
704232c2 JB |
180 | /* exported functions */ |
181 | ||
182 | struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) | |
183 | { | |
184 | struct cfg80211_registered_device *drv; | |
185 | int alloc_size; | |
186 | ||
187 | alloc_size = sizeof(*drv) + sizeof_priv; | |
188 | ||
189 | drv = kzalloc(alloc_size, GFP_KERNEL); | |
190 | if (!drv) | |
191 | return NULL; | |
192 | ||
193 | drv->ops = ops; | |
194 | ||
195 | mutex_lock(&cfg80211_drv_mutex); | |
196 | ||
a4d73ee1 JB |
197 | drv->idx = wiphy_counter; |
198 | ||
199 | /* now increase counter for the next device unless | |
200 | * it has wrapped previously */ | |
201 | if (wiphy_counter >= 0) | |
202 | wiphy_counter++; | |
203 | ||
204 | mutex_unlock(&cfg80211_drv_mutex); | |
205 | ||
206 | if (unlikely(drv->idx < 0)) { | |
704232c2 JB |
207 | /* ugh, wrapped! */ |
208 | kfree(drv); | |
209 | return NULL; | |
210 | } | |
704232c2 JB |
211 | |
212 | /* give it a proper name */ | |
213 | snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE, | |
214 | PHY_NAME "%d", drv->idx); | |
215 | ||
704232c2 JB |
216 | mutex_init(&drv->mtx); |
217 | mutex_init(&drv->devlist_mtx); | |
218 | INIT_LIST_HEAD(&drv->netdev_list); | |
219 | ||
220 | device_initialize(&drv->wiphy.dev); | |
221 | drv->wiphy.dev.class = &ieee80211_class; | |
222 | drv->wiphy.dev.platform_data = drv; | |
223 | ||
224 | return &drv->wiphy; | |
225 | } | |
226 | EXPORT_SYMBOL(wiphy_new); | |
227 | ||
228 | int wiphy_register(struct wiphy *wiphy) | |
229 | { | |
230 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
231 | int res; | |
232 | ||
233 | mutex_lock(&cfg80211_drv_mutex); | |
234 | ||
704232c2 JB |
235 | res = device_add(&drv->wiphy.dev); |
236 | if (res) | |
237 | goto out_unlock; | |
238 | ||
239 | list_add(&drv->list, &cfg80211_drv_list); | |
240 | ||
241 | /* add to debugfs */ | |
242 | drv->wiphy.debugfsdir = | |
243 | debugfs_create_dir(wiphy_name(&drv->wiphy), | |
244 | ieee80211_debugfs_dir); | |
245 | ||
246 | res = 0; | |
247 | out_unlock: | |
248 | mutex_unlock(&cfg80211_drv_mutex); | |
249 | return res; | |
250 | } | |
251 | EXPORT_SYMBOL(wiphy_register); | |
252 | ||
253 | void wiphy_unregister(struct wiphy *wiphy) | |
254 | { | |
255 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
256 | ||
f16bfc1c | 257 | /* protect the device list */ |
704232c2 JB |
258 | mutex_lock(&cfg80211_drv_mutex); |
259 | ||
f16bfc1c JB |
260 | BUG_ON(!list_empty(&drv->netdev_list)); |
261 | ||
262 | /* | |
263 | * Try to grab drv->mtx. If a command is still in progress, | |
264 | * hopefully the driver will refuse it since it's tearing | |
265 | * down the device already. We wait for this command to complete | |
266 | * before unlinking the item from the list. | |
267 | * Note: as codified by the BUG_ON above we cannot get here if | |
268 | * a virtual interface is still associated. Hence, we can only | |
269 | * get to lock contention here if userspace issues a command | |
270 | * that identified the hardware by wiphy index. | |
271 | */ | |
704232c2 | 272 | mutex_lock(&drv->mtx); |
f16bfc1c | 273 | /* unlock again before freeing */ |
704232c2 JB |
274 | mutex_unlock(&drv->mtx); |
275 | ||
f16bfc1c | 276 | list_del(&drv->list); |
704232c2 JB |
277 | device_del(&drv->wiphy.dev); |
278 | debugfs_remove(drv->wiphy.debugfsdir); | |
279 | ||
280 | mutex_unlock(&cfg80211_drv_mutex); | |
281 | } | |
282 | EXPORT_SYMBOL(wiphy_unregister); | |
283 | ||
284 | void cfg80211_dev_free(struct cfg80211_registered_device *drv) | |
285 | { | |
286 | mutex_destroy(&drv->mtx); | |
287 | mutex_destroy(&drv->devlist_mtx); | |
288 | kfree(drv); | |
289 | } | |
290 | ||
291 | void wiphy_free(struct wiphy *wiphy) | |
292 | { | |
293 | put_device(&wiphy->dev); | |
294 | } | |
295 | EXPORT_SYMBOL(wiphy_free); | |
296 | ||
297 | static int cfg80211_netdev_notifier_call(struct notifier_block * nb, | |
298 | unsigned long state, | |
299 | void *ndev) | |
300 | { | |
301 | struct net_device *dev = ndev; | |
302 | struct cfg80211_registered_device *rdev; | |
303 | ||
304 | if (!dev->ieee80211_ptr) | |
305 | return 0; | |
306 | ||
307 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
308 | ||
309 | switch (state) { | |
310 | case NETDEV_REGISTER: | |
311 | mutex_lock(&rdev->devlist_mtx); | |
312 | list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list); | |
313 | if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, | |
314 | "phy80211")) { | |
315 | printk(KERN_ERR "wireless: failed to add phy80211 " | |
316 | "symlink to netdev!\n"); | |
317 | } | |
318 | dev->ieee80211_ptr->netdev = dev; | |
319 | mutex_unlock(&rdev->devlist_mtx); | |
320 | break; | |
321 | case NETDEV_UNREGISTER: | |
322 | mutex_lock(&rdev->devlist_mtx); | |
323 | if (!list_empty(&dev->ieee80211_ptr->list)) { | |
324 | sysfs_remove_link(&dev->dev.kobj, "phy80211"); | |
325 | list_del_init(&dev->ieee80211_ptr->list); | |
326 | } | |
327 | mutex_unlock(&rdev->devlist_mtx); | |
328 | break; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static struct notifier_block cfg80211_netdev_notifier = { | |
335 | .notifier_call = cfg80211_netdev_notifier_call, | |
336 | }; | |
337 | ||
338 | static int cfg80211_init(void) | |
339 | { | |
340 | int err = wiphy_sysfs_init(); | |
341 | if (err) | |
342 | goto out_fail_sysfs; | |
343 | ||
344 | err = register_netdevice_notifier(&cfg80211_netdev_notifier); | |
345 | if (err) | |
346 | goto out_fail_notifier; | |
347 | ||
55682965 JB |
348 | err = nl80211_init(); |
349 | if (err) | |
350 | goto out_fail_nl80211; | |
351 | ||
704232c2 JB |
352 | ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); |
353 | ||
354 | return 0; | |
355 | ||
55682965 JB |
356 | out_fail_nl80211: |
357 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); | |
704232c2 JB |
358 | out_fail_notifier: |
359 | wiphy_sysfs_exit(); | |
360 | out_fail_sysfs: | |
361 | return err; | |
362 | } | |
3a462465 | 363 | subsys_initcall(cfg80211_init); |
704232c2 JB |
364 | |
365 | static void cfg80211_exit(void) | |
366 | { | |
367 | debugfs_remove(ieee80211_debugfs_dir); | |
55682965 | 368 | nl80211_exit(); |
704232c2 JB |
369 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); |
370 | wiphy_sysfs_exit(); | |
371 | } | |
372 | module_exit(cfg80211_exit); |