Commit | Line | Data |
---|---|---|
704232c2 JB |
1 | /* |
2 | * This is the linux wireless configuration interface. | |
3 | * | |
f59ac048 | 4 | * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net> |
704232c2 JB |
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" | |
b2e1b302 | 22 | #include "reg.h" |
704232c2 JB |
23 | |
24 | /* name for sysfs, %d is appended */ | |
25 | #define PHY_NAME "phy" | |
26 | ||
27 | MODULE_AUTHOR("Johannes Berg"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | MODULE_DESCRIPTION("wireless configuration support"); | |
30 | ||
31 | /* RCU might be appropriate here since we usually | |
32 | * only read the list, and that can happen quite | |
33 | * often because we need to do it for each command */ | |
34 | LIST_HEAD(cfg80211_drv_list); | |
35 | DEFINE_MUTEX(cfg80211_drv_mutex); | |
704232c2 JB |
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 | { | |
2940bb69 | 146 | struct cfg80211_registered_device *drv; |
55682965 JB |
147 | int idx, taken = -1, result, digits; |
148 | ||
2940bb69 EB |
149 | mutex_lock(&cfg80211_drv_mutex); |
150 | ||
55682965 JB |
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 */ | |
155 | digits = 1; | |
156 | while (idx /= 10) | |
157 | digits++; | |
158 | /* | |
159 | * deny the name if it is phy<idx> where <idx> is printed | |
160 | * without leading zeroes. taken == strlen(newname) here | |
161 | */ | |
2940bb69 | 162 | result = -EINVAL; |
55682965 | 163 | if (taken == strlen(PHY_NAME) + digits) |
2940bb69 EB |
164 | goto out_unlock; |
165 | } | |
166 | ||
167 | ||
168 | /* Ignore nop renames */ | |
169 | result = 0; | |
170 | if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) | |
171 | goto out_unlock; | |
172 | ||
173 | /* Ensure another device does not already have this name. */ | |
174 | list_for_each_entry(drv, &cfg80211_drv_list, list) { | |
175 | result = -EINVAL; | |
176 | if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0) | |
177 | goto out_unlock; | |
55682965 JB |
178 | } |
179 | ||
2940bb69 EB |
180 | /* this will only check for collisions in sysfs |
181 | * which is not even always compiled in. | |
182 | */ | |
55682965 JB |
183 | result = device_rename(&rdev->wiphy.dev, newname); |
184 | if (result) | |
2940bb69 | 185 | goto out_unlock; |
55682965 | 186 | |
33c0360b JB |
187 | if (rdev->wiphy.debugfsdir && |
188 | !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, | |
55682965 JB |
189 | rdev->wiphy.debugfsdir, |
190 | rdev->wiphy.debugfsdir->d_parent, | |
191 | newname)) | |
192 | printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", | |
193 | newname); | |
194 | ||
2940bb69 EB |
195 | result = 0; |
196 | out_unlock: | |
197 | mutex_unlock(&cfg80211_drv_mutex); | |
198 | if (result == 0) | |
199 | nl80211_notify_dev_rename(rdev); | |
55682965 | 200 | |
2940bb69 | 201 | return result; |
55682965 JB |
202 | } |
203 | ||
704232c2 JB |
204 | /* exported functions */ |
205 | ||
206 | struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) | |
207 | { | |
638af073 DC |
208 | static int wiphy_counter; |
209 | ||
704232c2 JB |
210 | struct cfg80211_registered_device *drv; |
211 | int alloc_size; | |
212 | ||
41ade00f JB |
213 | WARN_ON(!ops->add_key && ops->del_key); |
214 | WARN_ON(ops->add_key && !ops->del_key); | |
215 | ||
704232c2 JB |
216 | alloc_size = sizeof(*drv) + sizeof_priv; |
217 | ||
218 | drv = kzalloc(alloc_size, GFP_KERNEL); | |
219 | if (!drv) | |
220 | return NULL; | |
221 | ||
222 | drv->ops = ops; | |
223 | ||
224 | mutex_lock(&cfg80211_drv_mutex); | |
225 | ||
638af073 | 226 | drv->idx = wiphy_counter++; |
a4d73ee1 JB |
227 | |
228 | if (unlikely(drv->idx < 0)) { | |
638af073 DC |
229 | wiphy_counter--; |
230 | mutex_unlock(&cfg80211_drv_mutex); | |
704232c2 JB |
231 | /* ugh, wrapped! */ |
232 | kfree(drv); | |
233 | return NULL; | |
234 | } | |
704232c2 | 235 | |
638af073 DC |
236 | mutex_unlock(&cfg80211_drv_mutex); |
237 | ||
704232c2 | 238 | /* give it a proper name */ |
fb28ad35 | 239 | dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->idx); |
704232c2 | 240 | |
704232c2 JB |
241 | mutex_init(&drv->mtx); |
242 | mutex_init(&drv->devlist_mtx); | |
243 | INIT_LIST_HEAD(&drv->netdev_list); | |
244 | ||
245 | device_initialize(&drv->wiphy.dev); | |
246 | drv->wiphy.dev.class = &ieee80211_class; | |
247 | drv->wiphy.dev.platform_data = drv; | |
248 | ||
249 | return &drv->wiphy; | |
250 | } | |
251 | EXPORT_SYMBOL(wiphy_new); | |
252 | ||
253 | int wiphy_register(struct wiphy *wiphy) | |
254 | { | |
255 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
256 | int res; | |
8318d78a JB |
257 | enum ieee80211_band band; |
258 | struct ieee80211_supported_band *sband; | |
259 | bool have_band = false; | |
260 | int i; | |
f59ac048 LR |
261 | u16 ifmodes = wiphy->interface_modes; |
262 | ||
263 | /* sanity check ifmodes */ | |
264 | WARN_ON(!ifmodes); | |
265 | ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; | |
266 | if (WARN_ON(ifmodes != wiphy->interface_modes)) | |
267 | wiphy->interface_modes = ifmodes; | |
8318d78a JB |
268 | |
269 | /* sanity check supported bands/channels */ | |
270 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
271 | sband = wiphy->bands[band]; | |
272 | if (!sband) | |
273 | continue; | |
274 | ||
275 | sband->band = band; | |
276 | ||
277 | if (!sband->n_channels || !sband->n_bitrates) { | |
278 | WARN_ON(1); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
282 | for (i = 0; i < sband->n_channels; i++) { | |
283 | sband->channels[i].orig_flags = | |
284 | sband->channels[i].flags; | |
285 | sband->channels[i].orig_mag = | |
286 | sband->channels[i].max_antenna_gain; | |
287 | sband->channels[i].orig_mpwr = | |
288 | sband->channels[i].max_power; | |
289 | sband->channels[i].band = band; | |
290 | } | |
291 | ||
292 | have_band = true; | |
293 | } | |
294 | ||
295 | if (!have_band) { | |
296 | WARN_ON(1); | |
297 | return -EINVAL; | |
298 | } | |
299 | ||
300 | /* check and set up bitrates */ | |
301 | ieee80211_set_bitrate_flags(wiphy); | |
302 | ||
f3b407fb JB |
303 | mutex_lock(&cfg80211_drv_mutex); |
304 | ||
8318d78a | 305 | /* set up regulatory info */ |
b2e1b302 | 306 | wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE); |
704232c2 | 307 | |
704232c2 JB |
308 | res = device_add(&drv->wiphy.dev); |
309 | if (res) | |
310 | goto out_unlock; | |
311 | ||
312 | list_add(&drv->list, &cfg80211_drv_list); | |
313 | ||
314 | /* add to debugfs */ | |
315 | drv->wiphy.debugfsdir = | |
316 | debugfs_create_dir(wiphy_name(&drv->wiphy), | |
317 | ieee80211_debugfs_dir); | |
33c0360b JB |
318 | if (IS_ERR(drv->wiphy.debugfsdir)) |
319 | drv->wiphy.debugfsdir = NULL; | |
704232c2 JB |
320 | |
321 | res = 0; | |
322 | out_unlock: | |
323 | mutex_unlock(&cfg80211_drv_mutex); | |
324 | return res; | |
325 | } | |
326 | EXPORT_SYMBOL(wiphy_register); | |
327 | ||
328 | void wiphy_unregister(struct wiphy *wiphy) | |
329 | { | |
330 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
331 | ||
f16bfc1c | 332 | /* protect the device list */ |
704232c2 JB |
333 | mutex_lock(&cfg80211_drv_mutex); |
334 | ||
f16bfc1c JB |
335 | BUG_ON(!list_empty(&drv->netdev_list)); |
336 | ||
337 | /* | |
338 | * Try to grab drv->mtx. If a command is still in progress, | |
339 | * hopefully the driver will refuse it since it's tearing | |
340 | * down the device already. We wait for this command to complete | |
341 | * before unlinking the item from the list. | |
342 | * Note: as codified by the BUG_ON above we cannot get here if | |
343 | * a virtual interface is still associated. Hence, we can only | |
344 | * get to lock contention here if userspace issues a command | |
345 | * that identified the hardware by wiphy index. | |
346 | */ | |
704232c2 | 347 | mutex_lock(&drv->mtx); |
f16bfc1c | 348 | /* unlock again before freeing */ |
704232c2 JB |
349 | mutex_unlock(&drv->mtx); |
350 | ||
f16bfc1c | 351 | list_del(&drv->list); |
704232c2 JB |
352 | device_del(&drv->wiphy.dev); |
353 | debugfs_remove(drv->wiphy.debugfsdir); | |
354 | ||
355 | mutex_unlock(&cfg80211_drv_mutex); | |
356 | } | |
357 | EXPORT_SYMBOL(wiphy_unregister); | |
358 | ||
359 | void cfg80211_dev_free(struct cfg80211_registered_device *drv) | |
360 | { | |
361 | mutex_destroy(&drv->mtx); | |
362 | mutex_destroy(&drv->devlist_mtx); | |
363 | kfree(drv); | |
364 | } | |
365 | ||
366 | void wiphy_free(struct wiphy *wiphy) | |
367 | { | |
368 | put_device(&wiphy->dev); | |
369 | } | |
370 | EXPORT_SYMBOL(wiphy_free); | |
371 | ||
372 | static int cfg80211_netdev_notifier_call(struct notifier_block * nb, | |
373 | unsigned long state, | |
374 | void *ndev) | |
375 | { | |
376 | struct net_device *dev = ndev; | |
377 | struct cfg80211_registered_device *rdev; | |
378 | ||
379 | if (!dev->ieee80211_ptr) | |
380 | return 0; | |
381 | ||
382 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
383 | ||
60719ffd JB |
384 | WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED); |
385 | ||
704232c2 JB |
386 | switch (state) { |
387 | case NETDEV_REGISTER: | |
388 | mutex_lock(&rdev->devlist_mtx); | |
389 | list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list); | |
390 | if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, | |
391 | "phy80211")) { | |
392 | printk(KERN_ERR "wireless: failed to add phy80211 " | |
393 | "symlink to netdev!\n"); | |
394 | } | |
395 | dev->ieee80211_ptr->netdev = dev; | |
396 | mutex_unlock(&rdev->devlist_mtx); | |
397 | break; | |
398 | case NETDEV_UNREGISTER: | |
399 | mutex_lock(&rdev->devlist_mtx); | |
400 | if (!list_empty(&dev->ieee80211_ptr->list)) { | |
401 | sysfs_remove_link(&dev->dev.kobj, "phy80211"); | |
402 | list_del_init(&dev->ieee80211_ptr->list); | |
403 | } | |
404 | mutex_unlock(&rdev->devlist_mtx); | |
405 | break; | |
406 | } | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | static struct notifier_block cfg80211_netdev_notifier = { | |
412 | .notifier_call = cfg80211_netdev_notifier_call, | |
413 | }; | |
414 | ||
415 | static int cfg80211_init(void) | |
416 | { | |
b2e1b302 LR |
417 | int err; |
418 | ||
b2e1b302 | 419 | err = wiphy_sysfs_init(); |
704232c2 JB |
420 | if (err) |
421 | goto out_fail_sysfs; | |
422 | ||
423 | err = register_netdevice_notifier(&cfg80211_netdev_notifier); | |
424 | if (err) | |
425 | goto out_fail_notifier; | |
426 | ||
55682965 JB |
427 | err = nl80211_init(); |
428 | if (err) | |
429 | goto out_fail_nl80211; | |
430 | ||
704232c2 JB |
431 | ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); |
432 | ||
b2e1b302 LR |
433 | err = regulatory_init(); |
434 | if (err) | |
435 | goto out_fail_reg; | |
436 | ||
704232c2 JB |
437 | return 0; |
438 | ||
b2e1b302 LR |
439 | out_fail_reg: |
440 | debugfs_remove(ieee80211_debugfs_dir); | |
55682965 JB |
441 | out_fail_nl80211: |
442 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); | |
704232c2 JB |
443 | out_fail_notifier: |
444 | wiphy_sysfs_exit(); | |
445 | out_fail_sysfs: | |
446 | return err; | |
447 | } | |
b2e1b302 | 448 | |
3a462465 | 449 | subsys_initcall(cfg80211_init); |
704232c2 JB |
450 | |
451 | static void cfg80211_exit(void) | |
452 | { | |
453 | debugfs_remove(ieee80211_debugfs_dir); | |
55682965 | 454 | nl80211_exit(); |
704232c2 JB |
455 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); |
456 | wiphy_sysfs_exit(); | |
b2e1b302 | 457 | regulatory_exit(); |
704232c2 JB |
458 | } |
459 | module_exit(cfg80211_exit); |