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" | |
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); | |
704232c2 JB |
35 | |
36 | /* for debugfs */ | |
37 | static struct dentry *ieee80211_debugfs_dir; | |
38 | ||
55682965 JB |
39 | /* requires cfg80211_drv_mutex to be held! */ |
40 | static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy) | |
41 | { | |
42 | struct cfg80211_registered_device *result = NULL, *drv; | |
43 | ||
44 | list_for_each_entry(drv, &cfg80211_drv_list, list) { | |
45 | if (drv->idx == wiphy) { | |
46 | result = drv; | |
47 | break; | |
48 | } | |
49 | } | |
50 | ||
51 | return result; | |
52 | } | |
53 | ||
54 | /* requires cfg80211_drv_mutex to be held! */ | |
55 | static struct cfg80211_registered_device * | |
56 | __cfg80211_drv_from_info(struct genl_info *info) | |
57 | { | |
58 | int ifindex; | |
59 | struct cfg80211_registered_device *bywiphy = NULL, *byifidx = NULL; | |
60 | struct net_device *dev; | |
61 | int err = -EINVAL; | |
62 | ||
63 | if (info->attrs[NL80211_ATTR_WIPHY]) { | |
64 | bywiphy = cfg80211_drv_by_wiphy( | |
65 | nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); | |
66 | err = -ENODEV; | |
67 | } | |
68 | ||
69 | if (info->attrs[NL80211_ATTR_IFINDEX]) { | |
70 | ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); | |
71 | dev = dev_get_by_index(&init_net, ifindex); | |
72 | if (dev) { | |
73 | if (dev->ieee80211_ptr) | |
74 | byifidx = | |
75 | wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
76 | dev_put(dev); | |
77 | } | |
78 | err = -ENODEV; | |
79 | } | |
80 | ||
81 | if (bywiphy && byifidx) { | |
82 | if (bywiphy != byifidx) | |
83 | return ERR_PTR(-EINVAL); | |
84 | else | |
85 | return bywiphy; /* == byifidx */ | |
86 | } | |
87 | if (bywiphy) | |
88 | return bywiphy; | |
89 | ||
90 | if (byifidx) | |
91 | return byifidx; | |
92 | ||
93 | return ERR_PTR(err); | |
94 | } | |
95 | ||
96 | struct cfg80211_registered_device * | |
97 | cfg80211_get_dev_from_info(struct genl_info *info) | |
98 | { | |
99 | struct cfg80211_registered_device *drv; | |
100 | ||
101 | mutex_lock(&cfg80211_drv_mutex); | |
102 | drv = __cfg80211_drv_from_info(info); | |
103 | ||
104 | /* if it is not an error we grab the lock on | |
105 | * it to assure it won't be going away while | |
106 | * we operate on it */ | |
107 | if (!IS_ERR(drv)) | |
108 | mutex_lock(&drv->mtx); | |
109 | ||
110 | mutex_unlock(&cfg80211_drv_mutex); | |
111 | ||
112 | return drv; | |
113 | } | |
114 | ||
115 | struct cfg80211_registered_device * | |
116 | cfg80211_get_dev_from_ifindex(int ifindex) | |
117 | { | |
118 | struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV); | |
119 | struct net_device *dev; | |
120 | ||
121 | mutex_lock(&cfg80211_drv_mutex); | |
122 | dev = dev_get_by_index(&init_net, ifindex); | |
123 | if (!dev) | |
124 | goto out; | |
125 | if (dev->ieee80211_ptr) { | |
126 | drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
127 | mutex_lock(&drv->mtx); | |
128 | } else | |
129 | drv = ERR_PTR(-ENODEV); | |
130 | dev_put(dev); | |
131 | out: | |
132 | mutex_unlock(&cfg80211_drv_mutex); | |
133 | return drv; | |
134 | } | |
135 | ||
136 | void cfg80211_put_dev(struct cfg80211_registered_device *drv) | |
137 | { | |
138 | BUG_ON(IS_ERR(drv)); | |
139 | mutex_unlock(&drv->mtx); | |
140 | } | |
141 | ||
142 | int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, | |
143 | char *newname) | |
144 | { | |
2940bb69 | 145 | struct cfg80211_registered_device *drv; |
55682965 JB |
146 | int idx, taken = -1, result, digits; |
147 | ||
2940bb69 EB |
148 | mutex_lock(&cfg80211_drv_mutex); |
149 | ||
55682965 JB |
150 | /* prohibit calling the thing phy%d when %d is not its number */ |
151 | sscanf(newname, PHY_NAME "%d%n", &idx, &taken); | |
152 | if (taken == strlen(newname) && idx != rdev->idx) { | |
153 | /* count number of places needed to print idx */ | |
154 | digits = 1; | |
155 | while (idx /= 10) | |
156 | digits++; | |
157 | /* | |
158 | * deny the name if it is phy<idx> where <idx> is printed | |
159 | * without leading zeroes. taken == strlen(newname) here | |
160 | */ | |
2940bb69 | 161 | result = -EINVAL; |
55682965 | 162 | if (taken == strlen(PHY_NAME) + digits) |
2940bb69 EB |
163 | goto out_unlock; |
164 | } | |
165 | ||
166 | ||
167 | /* Ignore nop renames */ | |
168 | result = 0; | |
169 | if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) | |
170 | goto out_unlock; | |
171 | ||
172 | /* Ensure another device does not already have this name. */ | |
173 | list_for_each_entry(drv, &cfg80211_drv_list, list) { | |
174 | result = -EINVAL; | |
175 | if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0) | |
176 | goto out_unlock; | |
55682965 JB |
177 | } |
178 | ||
2940bb69 EB |
179 | /* this will only check for collisions in sysfs |
180 | * which is not even always compiled in. | |
181 | */ | |
55682965 JB |
182 | result = device_rename(&rdev->wiphy.dev, newname); |
183 | if (result) | |
2940bb69 | 184 | goto out_unlock; |
55682965 | 185 | |
33c0360b JB |
186 | if (rdev->wiphy.debugfsdir && |
187 | !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, | |
55682965 JB |
188 | rdev->wiphy.debugfsdir, |
189 | rdev->wiphy.debugfsdir->d_parent, | |
190 | newname)) | |
191 | printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", | |
192 | newname); | |
193 | ||
2940bb69 EB |
194 | result = 0; |
195 | out_unlock: | |
196 | mutex_unlock(&cfg80211_drv_mutex); | |
197 | if (result == 0) | |
198 | nl80211_notify_dev_rename(rdev); | |
55682965 | 199 | |
2940bb69 | 200 | return result; |
55682965 JB |
201 | } |
202 | ||
704232c2 JB |
203 | /* exported functions */ |
204 | ||
205 | struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) | |
206 | { | |
638af073 DC |
207 | static int wiphy_counter; |
208 | ||
704232c2 JB |
209 | struct cfg80211_registered_device *drv; |
210 | int alloc_size; | |
211 | ||
41ade00f JB |
212 | WARN_ON(!ops->add_key && ops->del_key); |
213 | WARN_ON(ops->add_key && !ops->del_key); | |
214 | ||
704232c2 JB |
215 | alloc_size = sizeof(*drv) + sizeof_priv; |
216 | ||
217 | drv = kzalloc(alloc_size, GFP_KERNEL); | |
218 | if (!drv) | |
219 | return NULL; | |
220 | ||
221 | drv->ops = ops; | |
222 | ||
223 | mutex_lock(&cfg80211_drv_mutex); | |
224 | ||
638af073 | 225 | drv->idx = wiphy_counter++; |
a4d73ee1 JB |
226 | |
227 | if (unlikely(drv->idx < 0)) { | |
638af073 DC |
228 | wiphy_counter--; |
229 | mutex_unlock(&cfg80211_drv_mutex); | |
704232c2 JB |
230 | /* ugh, wrapped! */ |
231 | kfree(drv); | |
232 | return NULL; | |
233 | } | |
704232c2 | 234 | |
638af073 DC |
235 | mutex_unlock(&cfg80211_drv_mutex); |
236 | ||
704232c2 | 237 | /* give it a proper name */ |
fb28ad35 | 238 | dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->idx); |
704232c2 | 239 | |
704232c2 JB |
240 | mutex_init(&drv->mtx); |
241 | mutex_init(&drv->devlist_mtx); | |
242 | INIT_LIST_HEAD(&drv->netdev_list); | |
2a519311 JB |
243 | spin_lock_init(&drv->bss_lock); |
244 | INIT_LIST_HEAD(&drv->bss_list); | |
704232c2 JB |
245 | |
246 | device_initialize(&drv->wiphy.dev); | |
247 | drv->wiphy.dev.class = &ieee80211_class; | |
248 | drv->wiphy.dev.platform_data = drv; | |
249 | ||
250 | return &drv->wiphy; | |
251 | } | |
252 | EXPORT_SYMBOL(wiphy_new); | |
253 | ||
254 | int wiphy_register(struct wiphy *wiphy) | |
255 | { | |
256 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
257 | int res; | |
8318d78a JB |
258 | enum ieee80211_band band; |
259 | struct ieee80211_supported_band *sband; | |
260 | bool have_band = false; | |
261 | int i; | |
f59ac048 LR |
262 | u16 ifmodes = wiphy->interface_modes; |
263 | ||
2a519311 JB |
264 | if (WARN_ON(wiphy->max_scan_ssids < 1)) |
265 | return -EINVAL; | |
266 | ||
f59ac048 LR |
267 | /* sanity check ifmodes */ |
268 | WARN_ON(!ifmodes); | |
269 | ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; | |
270 | if (WARN_ON(ifmodes != wiphy->interface_modes)) | |
271 | wiphy->interface_modes = ifmodes; | |
8318d78a JB |
272 | |
273 | /* sanity check supported bands/channels */ | |
274 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
275 | sband = wiphy->bands[band]; | |
276 | if (!sband) | |
277 | continue; | |
278 | ||
279 | sband->band = band; | |
280 | ||
881d948c JB |
281 | if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) |
282 | return -EINVAL; | |
283 | ||
284 | /* | |
285 | * Since we use a u32 for rate bitmaps in | |
286 | * ieee80211_get_response_rate, we cannot | |
287 | * have more than 32 legacy rates. | |
288 | */ | |
289 | if (WARN_ON(sband->n_bitrates > 32)) | |
8318d78a | 290 | return -EINVAL; |
8318d78a JB |
291 | |
292 | for (i = 0; i < sband->n_channels; i++) { | |
293 | sband->channels[i].orig_flags = | |
294 | sband->channels[i].flags; | |
295 | sband->channels[i].orig_mag = | |
296 | sband->channels[i].max_antenna_gain; | |
297 | sband->channels[i].orig_mpwr = | |
298 | sband->channels[i].max_power; | |
299 | sband->channels[i].band = band; | |
300 | } | |
301 | ||
302 | have_band = true; | |
303 | } | |
304 | ||
305 | if (!have_band) { | |
306 | WARN_ON(1); | |
307 | return -EINVAL; | |
308 | } | |
309 | ||
310 | /* check and set up bitrates */ | |
311 | ieee80211_set_bitrate_flags(wiphy); | |
312 | ||
f3b407fb JB |
313 | mutex_lock(&cfg80211_drv_mutex); |
314 | ||
8318d78a | 315 | /* set up regulatory info */ |
b2e1b302 | 316 | wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE); |
704232c2 | 317 | |
704232c2 JB |
318 | res = device_add(&drv->wiphy.dev); |
319 | if (res) | |
320 | goto out_unlock; | |
321 | ||
322 | list_add(&drv->list, &cfg80211_drv_list); | |
323 | ||
324 | /* add to debugfs */ | |
325 | drv->wiphy.debugfsdir = | |
326 | debugfs_create_dir(wiphy_name(&drv->wiphy), | |
327 | ieee80211_debugfs_dir); | |
33c0360b JB |
328 | if (IS_ERR(drv->wiphy.debugfsdir)) |
329 | drv->wiphy.debugfsdir = NULL; | |
704232c2 JB |
330 | |
331 | res = 0; | |
332 | out_unlock: | |
333 | mutex_unlock(&cfg80211_drv_mutex); | |
334 | return res; | |
335 | } | |
336 | EXPORT_SYMBOL(wiphy_register); | |
337 | ||
338 | void wiphy_unregister(struct wiphy *wiphy) | |
339 | { | |
340 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
341 | ||
f16bfc1c | 342 | /* protect the device list */ |
704232c2 JB |
343 | mutex_lock(&cfg80211_drv_mutex); |
344 | ||
f16bfc1c JB |
345 | BUG_ON(!list_empty(&drv->netdev_list)); |
346 | ||
347 | /* | |
348 | * Try to grab drv->mtx. If a command is still in progress, | |
349 | * hopefully the driver will refuse it since it's tearing | |
350 | * down the device already. We wait for this command to complete | |
351 | * before unlinking the item from the list. | |
352 | * Note: as codified by the BUG_ON above we cannot get here if | |
353 | * a virtual interface is still associated. Hence, we can only | |
354 | * get to lock contention here if userspace issues a command | |
355 | * that identified the hardware by wiphy index. | |
356 | */ | |
704232c2 | 357 | mutex_lock(&drv->mtx); |
f16bfc1c | 358 | /* unlock again before freeing */ |
704232c2 JB |
359 | mutex_unlock(&drv->mtx); |
360 | ||
3f2355cb LR |
361 | /* If this device got a regulatory hint tell core its |
362 | * free to listen now to a new shiny device regulatory hint */ | |
363 | reg_device_remove(wiphy); | |
364 | ||
f16bfc1c | 365 | list_del(&drv->list); |
704232c2 JB |
366 | device_del(&drv->wiphy.dev); |
367 | debugfs_remove(drv->wiphy.debugfsdir); | |
368 | ||
369 | mutex_unlock(&cfg80211_drv_mutex); | |
370 | } | |
371 | EXPORT_SYMBOL(wiphy_unregister); | |
372 | ||
373 | void cfg80211_dev_free(struct cfg80211_registered_device *drv) | |
374 | { | |
2a519311 | 375 | struct cfg80211_internal_bss *scan, *tmp; |
704232c2 JB |
376 | mutex_destroy(&drv->mtx); |
377 | mutex_destroy(&drv->devlist_mtx); | |
2a519311 JB |
378 | list_for_each_entry_safe(scan, tmp, &drv->bss_list, list) |
379 | kfree(scan); | |
704232c2 JB |
380 | kfree(drv); |
381 | } | |
382 | ||
383 | void wiphy_free(struct wiphy *wiphy) | |
384 | { | |
385 | put_device(&wiphy->dev); | |
386 | } | |
387 | EXPORT_SYMBOL(wiphy_free); | |
388 | ||
389 | static int cfg80211_netdev_notifier_call(struct notifier_block * nb, | |
390 | unsigned long state, | |
391 | void *ndev) | |
392 | { | |
393 | struct net_device *dev = ndev; | |
394 | struct cfg80211_registered_device *rdev; | |
395 | ||
396 | if (!dev->ieee80211_ptr) | |
397 | return 0; | |
398 | ||
399 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
400 | ||
60719ffd JB |
401 | WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED); |
402 | ||
704232c2 JB |
403 | switch (state) { |
404 | case NETDEV_REGISTER: | |
405 | mutex_lock(&rdev->devlist_mtx); | |
406 | list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list); | |
407 | if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, | |
408 | "phy80211")) { | |
409 | printk(KERN_ERR "wireless: failed to add phy80211 " | |
410 | "symlink to netdev!\n"); | |
411 | } | |
412 | dev->ieee80211_ptr->netdev = dev; | |
413 | mutex_unlock(&rdev->devlist_mtx); | |
414 | break; | |
415 | case NETDEV_UNREGISTER: | |
416 | mutex_lock(&rdev->devlist_mtx); | |
417 | if (!list_empty(&dev->ieee80211_ptr->list)) { | |
418 | sysfs_remove_link(&dev->dev.kobj, "phy80211"); | |
419 | list_del_init(&dev->ieee80211_ptr->list); | |
420 | } | |
421 | mutex_unlock(&rdev->devlist_mtx); | |
422 | break; | |
423 | } | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | static struct notifier_block cfg80211_netdev_notifier = { | |
429 | .notifier_call = cfg80211_netdev_notifier_call, | |
430 | }; | |
431 | ||
432 | static int cfg80211_init(void) | |
433 | { | |
b2e1b302 LR |
434 | int err; |
435 | ||
b2e1b302 | 436 | err = wiphy_sysfs_init(); |
704232c2 JB |
437 | if (err) |
438 | goto out_fail_sysfs; | |
439 | ||
440 | err = register_netdevice_notifier(&cfg80211_netdev_notifier); | |
441 | if (err) | |
442 | goto out_fail_notifier; | |
443 | ||
55682965 JB |
444 | err = nl80211_init(); |
445 | if (err) | |
446 | goto out_fail_nl80211; | |
447 | ||
704232c2 JB |
448 | ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); |
449 | ||
b2e1b302 LR |
450 | err = regulatory_init(); |
451 | if (err) | |
452 | goto out_fail_reg; | |
453 | ||
704232c2 JB |
454 | return 0; |
455 | ||
b2e1b302 LR |
456 | out_fail_reg: |
457 | debugfs_remove(ieee80211_debugfs_dir); | |
55682965 JB |
458 | out_fail_nl80211: |
459 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); | |
704232c2 JB |
460 | out_fail_notifier: |
461 | wiphy_sysfs_exit(); | |
462 | out_fail_sysfs: | |
463 | return err; | |
464 | } | |
b2e1b302 | 465 | |
3a462465 | 466 | subsys_initcall(cfg80211_init); |
704232c2 JB |
467 | |
468 | static void cfg80211_exit(void) | |
469 | { | |
470 | debugfs_remove(ieee80211_debugfs_dir); | |
55682965 | 471 | nl80211_exit(); |
704232c2 JB |
472 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); |
473 | wiphy_sysfs_exit(); | |
b2e1b302 | 474 | regulatory_exit(); |
704232c2 JB |
475 | } |
476 | module_exit(cfg80211_exit); |