cfg80211: clean up includes
[deliverable/linux.git] / net / wireless / core.c
1 /*
2 * This is the linux wireless configuration interface.
3 *
4 * Copyright 2006-2008 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/list.h>
11 #include <linux/nl80211.h>
12 #include <linux/debugfs.h>
13 #include <linux/notifier.h>
14 #include <linux/device.h>
15 #include <net/genetlink.h>
16 #include <net/cfg80211.h>
17 #include "nl80211.h"
18 #include "core.h"
19 #include "sysfs.h"
20
21 /* name for sysfs, %d is appended */
22 #define PHY_NAME "phy"
23
24 MODULE_AUTHOR("Johannes Berg");
25 MODULE_LICENSE("GPL");
26 MODULE_DESCRIPTION("wireless configuration support");
27
28 /* RCU might be appropriate here since we usually
29 * only read the list, and that can happen quite
30 * often because we need to do it for each command */
31 LIST_HEAD(cfg80211_drv_list);
32
33 /*
34 * This is used to protect the cfg80211_drv_list, cfg80211_regdomain,
35 * country_ie_regdomain, the reg_beacon_list and the the last regulatory
36 * request receipt (last_request).
37 */
38 DEFINE_MUTEX(cfg80211_mutex);
39
40 /* for debugfs */
41 static struct dentry *ieee80211_debugfs_dir;
42
43 /* requires cfg80211_mutex to be held! */
44 struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx)
45 {
46 struct cfg80211_registered_device *result = NULL, *drv;
47
48 if (!wiphy_idx_valid(wiphy_idx))
49 return NULL;
50
51 assert_cfg80211_lock();
52
53 list_for_each_entry(drv, &cfg80211_drv_list, list) {
54 if (drv->wiphy_idx == wiphy_idx) {
55 result = drv;
56 break;
57 }
58 }
59
60 return result;
61 }
62
63 int get_wiphy_idx(struct wiphy *wiphy)
64 {
65 struct cfg80211_registered_device *drv;
66 if (!wiphy)
67 return WIPHY_IDX_STALE;
68 drv = wiphy_to_dev(wiphy);
69 return drv->wiphy_idx;
70 }
71
72 /* requires cfg80211_drv_mutex to be held! */
73 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
74 {
75 struct cfg80211_registered_device *drv;
76
77 if (!wiphy_idx_valid(wiphy_idx))
78 return NULL;
79
80 assert_cfg80211_lock();
81
82 drv = cfg80211_drv_by_wiphy_idx(wiphy_idx);
83 if (!drv)
84 return NULL;
85 return &drv->wiphy;
86 }
87
88 /* requires cfg80211_mutex to be held! */
89 struct cfg80211_registered_device *
90 __cfg80211_drv_from_info(struct genl_info *info)
91 {
92 int ifindex;
93 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
94 struct net_device *dev;
95 int err = -EINVAL;
96
97 assert_cfg80211_lock();
98
99 if (info->attrs[NL80211_ATTR_WIPHY]) {
100 bywiphyidx = cfg80211_drv_by_wiphy_idx(
101 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
102 err = -ENODEV;
103 }
104
105 if (info->attrs[NL80211_ATTR_IFINDEX]) {
106 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
107 dev = dev_get_by_index(&init_net, ifindex);
108 if (dev) {
109 if (dev->ieee80211_ptr)
110 byifidx =
111 wiphy_to_dev(dev->ieee80211_ptr->wiphy);
112 dev_put(dev);
113 }
114 err = -ENODEV;
115 }
116
117 if (bywiphyidx && byifidx) {
118 if (bywiphyidx != byifidx)
119 return ERR_PTR(-EINVAL);
120 else
121 return bywiphyidx; /* == byifidx */
122 }
123 if (bywiphyidx)
124 return bywiphyidx;
125
126 if (byifidx)
127 return byifidx;
128
129 return ERR_PTR(err);
130 }
131
132 struct cfg80211_registered_device *
133 cfg80211_get_dev_from_info(struct genl_info *info)
134 {
135 struct cfg80211_registered_device *drv;
136
137 mutex_lock(&cfg80211_mutex);
138 drv = __cfg80211_drv_from_info(info);
139
140 /* if it is not an error we grab the lock on
141 * it to assure it won't be going away while
142 * we operate on it */
143 if (!IS_ERR(drv))
144 mutex_lock(&drv->mtx);
145
146 mutex_unlock(&cfg80211_mutex);
147
148 return drv;
149 }
150
151 struct cfg80211_registered_device *
152 cfg80211_get_dev_from_ifindex(int ifindex)
153 {
154 struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
155 struct net_device *dev;
156
157 mutex_lock(&cfg80211_mutex);
158 dev = dev_get_by_index(&init_net, ifindex);
159 if (!dev)
160 goto out;
161 if (dev->ieee80211_ptr) {
162 drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
163 mutex_lock(&drv->mtx);
164 } else
165 drv = ERR_PTR(-ENODEV);
166 dev_put(dev);
167 out:
168 mutex_unlock(&cfg80211_mutex);
169 return drv;
170 }
171
172 void cfg80211_put_dev(struct cfg80211_registered_device *drv)
173 {
174 BUG_ON(IS_ERR(drv));
175 mutex_unlock(&drv->mtx);
176 }
177
178 /* requires cfg80211_mutex to be held */
179 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
180 char *newname)
181 {
182 struct cfg80211_registered_device *drv;
183 int wiphy_idx, taken = -1, result, digits;
184
185 assert_cfg80211_lock();
186
187 /* prohibit calling the thing phy%d when %d is not its number */
188 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
189 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
190 /* count number of places needed to print wiphy_idx */
191 digits = 1;
192 while (wiphy_idx /= 10)
193 digits++;
194 /*
195 * deny the name if it is phy<idx> where <idx> is printed
196 * without leading zeroes. taken == strlen(newname) here
197 */
198 if (taken == strlen(PHY_NAME) + digits)
199 return -EINVAL;
200 }
201
202
203 /* Ignore nop renames */
204 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
205 return 0;
206
207 /* Ensure another device does not already have this name. */
208 list_for_each_entry(drv, &cfg80211_drv_list, list)
209 if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
210 return -EINVAL;
211
212 result = device_rename(&rdev->wiphy.dev, newname);
213 if (result)
214 return result;
215
216 if (rdev->wiphy.debugfsdir &&
217 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
218 rdev->wiphy.debugfsdir,
219 rdev->wiphy.debugfsdir->d_parent,
220 newname))
221 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
222 newname);
223
224 nl80211_notify_dev_rename(rdev);
225
226 return 0;
227 }
228
229 /* exported functions */
230
231 struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
232 {
233 static int wiphy_counter;
234
235 struct cfg80211_registered_device *drv;
236 int alloc_size;
237
238 WARN_ON(!ops->add_key && ops->del_key);
239 WARN_ON(ops->add_key && !ops->del_key);
240
241 alloc_size = sizeof(*drv) + sizeof_priv;
242
243 drv = kzalloc(alloc_size, GFP_KERNEL);
244 if (!drv)
245 return NULL;
246
247 drv->ops = ops;
248
249 mutex_lock(&cfg80211_mutex);
250
251 drv->wiphy_idx = wiphy_counter++;
252
253 if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
254 wiphy_counter--;
255 mutex_unlock(&cfg80211_mutex);
256 /* ugh, wrapped! */
257 kfree(drv);
258 return NULL;
259 }
260
261 mutex_unlock(&cfg80211_mutex);
262
263 /* give it a proper name */
264 dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
265
266 mutex_init(&drv->mtx);
267 mutex_init(&drv->devlist_mtx);
268 INIT_LIST_HEAD(&drv->netdev_list);
269 spin_lock_init(&drv->bss_lock);
270 INIT_LIST_HEAD(&drv->bss_list);
271
272 device_initialize(&drv->wiphy.dev);
273 drv->wiphy.dev.class = &ieee80211_class;
274 drv->wiphy.dev.platform_data = drv;
275
276 return &drv->wiphy;
277 }
278 EXPORT_SYMBOL(wiphy_new);
279
280 int wiphy_register(struct wiphy *wiphy)
281 {
282 struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
283 int res;
284 enum ieee80211_band band;
285 struct ieee80211_supported_band *sband;
286 bool have_band = false;
287 int i;
288 u16 ifmodes = wiphy->interface_modes;
289
290 if (WARN_ON(wiphy->max_scan_ssids < 1))
291 return -EINVAL;
292
293 /* sanity check ifmodes */
294 WARN_ON(!ifmodes);
295 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
296 if (WARN_ON(ifmodes != wiphy->interface_modes))
297 wiphy->interface_modes = ifmodes;
298
299 /* sanity check supported bands/channels */
300 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
301 sband = wiphy->bands[band];
302 if (!sband)
303 continue;
304
305 sband->band = band;
306
307 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
308 return -EINVAL;
309
310 /*
311 * Since we use a u32 for rate bitmaps in
312 * ieee80211_get_response_rate, we cannot
313 * have more than 32 legacy rates.
314 */
315 if (WARN_ON(sband->n_bitrates > 32))
316 return -EINVAL;
317
318 for (i = 0; i < sband->n_channels; i++) {
319 sband->channels[i].orig_flags =
320 sband->channels[i].flags;
321 sband->channels[i].orig_mag =
322 sband->channels[i].max_antenna_gain;
323 sband->channels[i].orig_mpwr =
324 sband->channels[i].max_power;
325 sband->channels[i].band = band;
326 }
327
328 have_band = true;
329 }
330
331 if (!have_band) {
332 WARN_ON(1);
333 return -EINVAL;
334 }
335
336 /* check and set up bitrates */
337 ieee80211_set_bitrate_flags(wiphy);
338
339 mutex_lock(&cfg80211_mutex);
340
341 /* set up regulatory info */
342 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
343
344 res = device_add(&drv->wiphy.dev);
345 if (res)
346 goto out_unlock;
347
348 list_add(&drv->list, &cfg80211_drv_list);
349
350 /* add to debugfs */
351 drv->wiphy.debugfsdir =
352 debugfs_create_dir(wiphy_name(&drv->wiphy),
353 ieee80211_debugfs_dir);
354 if (IS_ERR(drv->wiphy.debugfsdir))
355 drv->wiphy.debugfsdir = NULL;
356
357 if (wiphy->custom_regulatory) {
358 struct regulatory_request request;
359
360 request.wiphy_idx = get_wiphy_idx(wiphy);
361 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
362 request.alpha2[0] = '9';
363 request.alpha2[1] = '9';
364
365 nl80211_send_reg_change_event(&request);
366 }
367
368 res = 0;
369 out_unlock:
370 mutex_unlock(&cfg80211_mutex);
371 return res;
372 }
373 EXPORT_SYMBOL(wiphy_register);
374
375 void wiphy_unregister(struct wiphy *wiphy)
376 {
377 struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
378
379 /* protect the device list */
380 mutex_lock(&cfg80211_mutex);
381
382 BUG_ON(!list_empty(&drv->netdev_list));
383
384 /*
385 * Try to grab drv->mtx. If a command is still in progress,
386 * hopefully the driver will refuse it since it's tearing
387 * down the device already. We wait for this command to complete
388 * before unlinking the item from the list.
389 * Note: as codified by the BUG_ON above we cannot get here if
390 * a virtual interface is still associated. Hence, we can only
391 * get to lock contention here if userspace issues a command
392 * that identified the hardware by wiphy index.
393 */
394 mutex_lock(&drv->mtx);
395 /* unlock again before freeing */
396 mutex_unlock(&drv->mtx);
397
398 /* If this device got a regulatory hint tell core its
399 * free to listen now to a new shiny device regulatory hint */
400 reg_device_remove(wiphy);
401
402 list_del(&drv->list);
403 device_del(&drv->wiphy.dev);
404 debugfs_remove(drv->wiphy.debugfsdir);
405
406 mutex_unlock(&cfg80211_mutex);
407 }
408 EXPORT_SYMBOL(wiphy_unregister);
409
410 void cfg80211_dev_free(struct cfg80211_registered_device *drv)
411 {
412 struct cfg80211_internal_bss *scan, *tmp;
413 mutex_destroy(&drv->mtx);
414 mutex_destroy(&drv->devlist_mtx);
415 list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
416 cfg80211_put_bss(&scan->pub);
417 kfree(drv);
418 }
419
420 void wiphy_free(struct wiphy *wiphy)
421 {
422 put_device(&wiphy->dev);
423 }
424 EXPORT_SYMBOL(wiphy_free);
425
426 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
427 unsigned long state,
428 void *ndev)
429 {
430 struct net_device *dev = ndev;
431 struct cfg80211_registered_device *rdev;
432
433 if (!dev->ieee80211_ptr)
434 return 0;
435
436 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
437
438 WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);
439
440 switch (state) {
441 case NETDEV_REGISTER:
442 mutex_lock(&rdev->devlist_mtx);
443 list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
444 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
445 "phy80211")) {
446 printk(KERN_ERR "wireless: failed to add phy80211 "
447 "symlink to netdev!\n");
448 }
449 dev->ieee80211_ptr->netdev = dev;
450 mutex_unlock(&rdev->devlist_mtx);
451 break;
452 case NETDEV_GOING_DOWN:
453 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
454 break;
455 if (!dev->ieee80211_ptr->ssid_len)
456 break;
457 cfg80211_leave_ibss(rdev, dev);
458 break;
459 case NETDEV_UP:
460 #ifdef CONFIG_WIRELESS_EXT
461 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
462 break;
463 if (!dev->ieee80211_ptr->wext.ssid_len)
464 break;
465 cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext);
466 break;
467 #endif
468 case NETDEV_UNREGISTER:
469 mutex_lock(&rdev->devlist_mtx);
470 if (!list_empty(&dev->ieee80211_ptr->list)) {
471 sysfs_remove_link(&dev->dev.kobj, "phy80211");
472 list_del_init(&dev->ieee80211_ptr->list);
473 }
474 mutex_unlock(&rdev->devlist_mtx);
475 break;
476 }
477
478 return 0;
479 }
480
481 static struct notifier_block cfg80211_netdev_notifier = {
482 .notifier_call = cfg80211_netdev_notifier_call,
483 };
484
485 static int cfg80211_init(void)
486 {
487 int err;
488
489 err = wiphy_sysfs_init();
490 if (err)
491 goto out_fail_sysfs;
492
493 err = register_netdevice_notifier(&cfg80211_netdev_notifier);
494 if (err)
495 goto out_fail_notifier;
496
497 err = nl80211_init();
498 if (err)
499 goto out_fail_nl80211;
500
501 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
502
503 err = regulatory_init();
504 if (err)
505 goto out_fail_reg;
506
507 return 0;
508
509 out_fail_reg:
510 debugfs_remove(ieee80211_debugfs_dir);
511 out_fail_nl80211:
512 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
513 out_fail_notifier:
514 wiphy_sysfs_exit();
515 out_fail_sysfs:
516 return err;
517 }
518
519 subsys_initcall(cfg80211_init);
520
521 static void cfg80211_exit(void)
522 {
523 debugfs_remove(ieee80211_debugfs_dir);
524 nl80211_exit();
525 unregister_netdevice_notifier(&cfg80211_netdev_notifier);
526 wiphy_sysfs_exit();
527 regulatory_exit();
528 }
529 module_exit(cfg80211_exit);
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