blob: f1da0b93bc56d177cae4d350ce470c29c1e4da4c [file] [log] [blame]
Johannes Berg704232c2007-04-23 12:20:05 -07001/*
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>
Johannes Berg55682962007-09-20 13:09:35 -040019#include "nl80211.h"
Johannes Berg704232c2007-04-23 12:20:05 -070020#include "core.h"
21#include "sysfs.h"
22
23/* name for sysfs, %d is appended */
24#define PHY_NAME "phy"
25
26MODULE_AUTHOR("Johannes Berg");
27MODULE_LICENSE("GPL");
28MODULE_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 */
33LIST_HEAD(cfg80211_drv_list);
34DEFINE_MUTEX(cfg80211_drv_mutex);
35static int wiphy_counter;
36
37/* for debugfs */
38static struct dentry *ieee80211_debugfs_dir;
39
Johannes Berg55682962007-09-20 13:09:35 -040040/* requires cfg80211_drv_mutex to be held! */
41static 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! */
56static 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
97struct cfg80211_registered_device *
98cfg80211_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
116struct cfg80211_registered_device *
117cfg80211_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
137void cfg80211_put_dev(struct cfg80211_registered_device *drv)
138{
139 BUG_ON(IS_ERR(drv));
140 mutex_unlock(&drv->mtx);
141}
142
143int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
144 char *newname)
145{
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700146 struct cfg80211_registered_device *drv;
Johannes Berg55682962007-09-20 13:09:35 -0400147 int idx, taken = -1, result, digits;
148
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700149 mutex_lock(&cfg80211_drv_mutex);
150
Johannes Berg55682962007-09-20 13:09:35 -0400151 /* 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 */
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700162 result = -EINVAL;
Johannes Berg55682962007-09-20 13:09:35 -0400163 if (taken == strlen(PHY_NAME) + digits)
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700164 goto out_unlock;
Johannes Berg55682962007-09-20 13:09:35 -0400165 }
166
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700167
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;
178 }
179
180 /* this will only check for collisions in sysfs
181 * which is not even always compiled in.
182 */
Johannes Berg55682962007-09-20 13:09:35 -0400183 result = device_rename(&rdev->wiphy.dev, newname);
184 if (result)
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700185 goto out_unlock;
Johannes Berg55682962007-09-20 13:09:35 -0400186
187 if (!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
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
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700194 result = 0;
195out_unlock:
196 mutex_unlock(&cfg80211_drv_mutex);
197 if (result == 0)
198 nl80211_notify_dev_rename(rdev);
Johannes Berg55682962007-09-20 13:09:35 -0400199
Eric W. Biederman2940bb62008-05-08 14:30:18 -0700200 return result;
Johannes Berg55682962007-09-20 13:09:35 -0400201}
202
Johannes Berg704232c2007-04-23 12:20:05 -0700203/* exported functions */
204
205struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
206{
207 struct cfg80211_registered_device *drv;
208 int alloc_size;
209
Johannes Berg41ade002007-12-19 02:03:29 +0100210 WARN_ON(!ops->add_key && ops->del_key);
211 WARN_ON(ops->add_key && !ops->del_key);
212
Johannes Berg704232c2007-04-23 12:20:05 -0700213 alloc_size = sizeof(*drv) + sizeof_priv;
214
215 drv = kzalloc(alloc_size, GFP_KERNEL);
216 if (!drv)
217 return NULL;
218
219 drv->ops = ops;
220
221 mutex_lock(&cfg80211_drv_mutex);
222
Johannes Berga4d73ee2007-04-26 20:50:35 -0700223 drv->idx = wiphy_counter;
224
225 /* now increase counter for the next device unless
226 * it has wrapped previously */
227 if (wiphy_counter >= 0)
228 wiphy_counter++;
229
230 mutex_unlock(&cfg80211_drv_mutex);
231
232 if (unlikely(drv->idx < 0)) {
Johannes Berg704232c2007-04-23 12:20:05 -0700233 /* ugh, wrapped! */
234 kfree(drv);
235 return NULL;
236 }
Johannes Berg704232c2007-04-23 12:20:05 -0700237
238 /* give it a proper name */
239 snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
240 PHY_NAME "%d", drv->idx);
241
Johannes Berg704232c2007-04-23 12:20:05 -0700242 mutex_init(&drv->mtx);
243 mutex_init(&drv->devlist_mtx);
244 INIT_LIST_HEAD(&drv->netdev_list);
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}
252EXPORT_SYMBOL(wiphy_new);
253
254int wiphy_register(struct wiphy *wiphy)
255{
256 struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
257 int res;
Johannes Berg8318d782008-01-24 19:38:38 +0100258 enum ieee80211_band band;
259 struct ieee80211_supported_band *sband;
260 bool have_band = false;
261 int i;
262
263 /* sanity check supported bands/channels */
264 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
265 sband = wiphy->bands[band];
266 if (!sband)
267 continue;
268
269 sband->band = band;
270
271 if (!sband->n_channels || !sband->n_bitrates) {
272 WARN_ON(1);
273 return -EINVAL;
274 }
275
276 for (i = 0; i < sband->n_channels; i++) {
277 sband->channels[i].orig_flags =
278 sband->channels[i].flags;
279 sband->channels[i].orig_mag =
280 sband->channels[i].max_antenna_gain;
281 sband->channels[i].orig_mpwr =
282 sband->channels[i].max_power;
283 sband->channels[i].band = band;
284 }
285
286 have_band = true;
287 }
288
289 if (!have_band) {
290 WARN_ON(1);
291 return -EINVAL;
292 }
293
294 /* check and set up bitrates */
295 ieee80211_set_bitrate_flags(wiphy);
296
297 /* set up regulatory info */
298 wiphy_update_regulatory(wiphy);
Johannes Berg704232c2007-04-23 12:20:05 -0700299
300 mutex_lock(&cfg80211_drv_mutex);
301
Johannes Berg704232c2007-04-23 12:20:05 -0700302 res = device_add(&drv->wiphy.dev);
303 if (res)
304 goto out_unlock;
305
306 list_add(&drv->list, &cfg80211_drv_list);
307
308 /* add to debugfs */
309 drv->wiphy.debugfsdir =
310 debugfs_create_dir(wiphy_name(&drv->wiphy),
311 ieee80211_debugfs_dir);
312
313 res = 0;
314out_unlock:
315 mutex_unlock(&cfg80211_drv_mutex);
316 return res;
317}
318EXPORT_SYMBOL(wiphy_register);
319
320void wiphy_unregister(struct wiphy *wiphy)
321{
322 struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
323
Johannes Bergf16bfc12007-04-26 20:51:12 -0700324 /* protect the device list */
Johannes Berg704232c2007-04-23 12:20:05 -0700325 mutex_lock(&cfg80211_drv_mutex);
326
Johannes Bergf16bfc12007-04-26 20:51:12 -0700327 BUG_ON(!list_empty(&drv->netdev_list));
328
329 /*
330 * Try to grab drv->mtx. If a command is still in progress,
331 * hopefully the driver will refuse it since it's tearing
332 * down the device already. We wait for this command to complete
333 * before unlinking the item from the list.
334 * Note: as codified by the BUG_ON above we cannot get here if
335 * a virtual interface is still associated. Hence, we can only
336 * get to lock contention here if userspace issues a command
337 * that identified the hardware by wiphy index.
338 */
Johannes Berg704232c2007-04-23 12:20:05 -0700339 mutex_lock(&drv->mtx);
Johannes Bergf16bfc12007-04-26 20:51:12 -0700340 /* unlock again before freeing */
Johannes Berg704232c2007-04-23 12:20:05 -0700341 mutex_unlock(&drv->mtx);
342
Johannes Bergf16bfc12007-04-26 20:51:12 -0700343 list_del(&drv->list);
Johannes Berg704232c2007-04-23 12:20:05 -0700344 device_del(&drv->wiphy.dev);
345 debugfs_remove(drv->wiphy.debugfsdir);
346
347 mutex_unlock(&cfg80211_drv_mutex);
348}
349EXPORT_SYMBOL(wiphy_unregister);
350
351void cfg80211_dev_free(struct cfg80211_registered_device *drv)
352{
353 mutex_destroy(&drv->mtx);
354 mutex_destroy(&drv->devlist_mtx);
355 kfree(drv);
356}
357
358void wiphy_free(struct wiphy *wiphy)
359{
360 put_device(&wiphy->dev);
361}
362EXPORT_SYMBOL(wiphy_free);
363
364static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
365 unsigned long state,
366 void *ndev)
367{
368 struct net_device *dev = ndev;
369 struct cfg80211_registered_device *rdev;
370
371 if (!dev->ieee80211_ptr)
372 return 0;
373
374 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
375
376 switch (state) {
377 case NETDEV_REGISTER:
378 mutex_lock(&rdev->devlist_mtx);
379 list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
380 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
381 "phy80211")) {
382 printk(KERN_ERR "wireless: failed to add phy80211 "
383 "symlink to netdev!\n");
384 }
385 dev->ieee80211_ptr->netdev = dev;
386 mutex_unlock(&rdev->devlist_mtx);
387 break;
388 case NETDEV_UNREGISTER:
389 mutex_lock(&rdev->devlist_mtx);
390 if (!list_empty(&dev->ieee80211_ptr->list)) {
391 sysfs_remove_link(&dev->dev.kobj, "phy80211");
392 list_del_init(&dev->ieee80211_ptr->list);
393 }
394 mutex_unlock(&rdev->devlist_mtx);
395 break;
396 }
397
398 return 0;
399}
400
401static struct notifier_block cfg80211_netdev_notifier = {
402 .notifier_call = cfg80211_netdev_notifier_call,
403};
404
405static int cfg80211_init(void)
406{
407 int err = wiphy_sysfs_init();
408 if (err)
409 goto out_fail_sysfs;
410
411 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
412 if (err)
413 goto out_fail_notifier;
414
Johannes Berg55682962007-09-20 13:09:35 -0400415 err = nl80211_init();
416 if (err)
417 goto out_fail_nl80211;
418
Johannes Berg704232c2007-04-23 12:20:05 -0700419 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
420
421 return 0;
422
Johannes Berg55682962007-09-20 13:09:35 -0400423out_fail_nl80211:
424 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
Johannes Berg704232c2007-04-23 12:20:05 -0700425out_fail_notifier:
426 wiphy_sysfs_exit();
427out_fail_sysfs:
428 return err;
429}
Johannes Berg3a462462007-09-10 13:44:45 +0200430subsys_initcall(cfg80211_init);
Johannes Berg704232c2007-04-23 12:20:05 -0700431
432static void cfg80211_exit(void)
433{
434 debugfs_remove(ieee80211_debugfs_dir);
Johannes Berg55682962007-09-20 13:09:35 -0400435 nl80211_exit();
Johannes Berg704232c2007-04-23 12:20:05 -0700436 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
437 wiphy_sysfs_exit();
438}
439module_exit(cfg80211_exit);