mac80211/cfg80211: move wiphy specific debugfs entries to cfg80211
[linux-2.6.git] / net / wireless / core.c
1 /*
2  * This is the linux wireless configuration interface.
3  *
4  * Copyright 2006-2009          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 #include "debugfs.h"
21
22 /* name for sysfs, %d is appended */
23 #define PHY_NAME "phy"
24
25 MODULE_AUTHOR("Johannes Berg");
26 MODULE_LICENSE("GPL");
27 MODULE_DESCRIPTION("wireless configuration support");
28
29 /* RCU might be appropriate here since we usually
30  * only read the list, and that can happen quite
31  * often because we need to do it for each command */
32 LIST_HEAD(cfg80211_drv_list);
33
34 /*
35  * This is used to protect the cfg80211_drv_list, cfg80211_regdomain,
36  * country_ie_regdomain, the reg_beacon_list and the the last regulatory
37  * request receipt (last_request).
38  */
39 DEFINE_MUTEX(cfg80211_mutex);
40
41 /* for debugfs */
42 static struct dentry *ieee80211_debugfs_dir;
43
44 /* requires cfg80211_mutex to be held! */
45 struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx)
46 {
47         struct cfg80211_registered_device *result = NULL, *drv;
48
49         if (!wiphy_idx_valid(wiphy_idx))
50                 return NULL;
51
52         assert_cfg80211_lock();
53
54         list_for_each_entry(drv, &cfg80211_drv_list, list) {
55                 if (drv->wiphy_idx == wiphy_idx) {
56                         result = drv;
57                         break;
58                 }
59         }
60
61         return result;
62 }
63
64 int get_wiphy_idx(struct wiphy *wiphy)
65 {
66         struct cfg80211_registered_device *drv;
67         if (!wiphy)
68                 return WIPHY_IDX_STALE;
69         drv = wiphy_to_dev(wiphy);
70         return drv->wiphy_idx;
71 }
72
73 /* requires cfg80211_drv_mutex to be held! */
74 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
75 {
76         struct cfg80211_registered_device *drv;
77
78         if (!wiphy_idx_valid(wiphy_idx))
79                 return NULL;
80
81         assert_cfg80211_lock();
82
83         drv = cfg80211_drv_by_wiphy_idx(wiphy_idx);
84         if (!drv)
85                 return NULL;
86         return &drv->wiphy;
87 }
88
89 /* requires cfg80211_mutex to be held! */
90 struct cfg80211_registered_device *
91 __cfg80211_drv_from_info(struct genl_info *info)
92 {
93         int ifindex;
94         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
95         struct net_device *dev;
96         int err = -EINVAL;
97
98         assert_cfg80211_lock();
99
100         if (info->attrs[NL80211_ATTR_WIPHY]) {
101                 bywiphyidx = cfg80211_drv_by_wiphy_idx(
102                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
103                 err = -ENODEV;
104         }
105
106         if (info->attrs[NL80211_ATTR_IFINDEX]) {
107                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
108                 dev = dev_get_by_index(&init_net, ifindex);
109                 if (dev) {
110                         if (dev->ieee80211_ptr)
111                                 byifidx =
112                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
113                         dev_put(dev);
114                 }
115                 err = -ENODEV;
116         }
117
118         if (bywiphyidx && byifidx) {
119                 if (bywiphyidx != byifidx)
120                         return ERR_PTR(-EINVAL);
121                 else
122                         return bywiphyidx; /* == byifidx */
123         }
124         if (bywiphyidx)
125                 return bywiphyidx;
126
127         if (byifidx)
128                 return byifidx;
129
130         return ERR_PTR(err);
131 }
132
133 struct cfg80211_registered_device *
134 cfg80211_get_dev_from_info(struct genl_info *info)
135 {
136         struct cfg80211_registered_device *drv;
137
138         mutex_lock(&cfg80211_mutex);
139         drv = __cfg80211_drv_from_info(info);
140
141         /* if it is not an error we grab the lock on
142          * it to assure it won't be going away while
143          * we operate on it */
144         if (!IS_ERR(drv))
145                 mutex_lock(&drv->mtx);
146
147         mutex_unlock(&cfg80211_mutex);
148
149         return drv;
150 }
151
152 struct cfg80211_registered_device *
153 cfg80211_get_dev_from_ifindex(int ifindex)
154 {
155         struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
156         struct net_device *dev;
157
158         mutex_lock(&cfg80211_mutex);
159         dev = dev_get_by_index(&init_net, ifindex);
160         if (!dev)
161                 goto out;
162         if (dev->ieee80211_ptr) {
163                 drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
164                 mutex_lock(&drv->mtx);
165         } else
166                 drv = ERR_PTR(-ENODEV);
167         dev_put(dev);
168  out:
169         mutex_unlock(&cfg80211_mutex);
170         return drv;
171 }
172
173 void cfg80211_put_dev(struct cfg80211_registered_device *drv)
174 {
175         BUG_ON(IS_ERR(drv));
176         mutex_unlock(&drv->mtx);
177 }
178
179 /* requires cfg80211_mutex to be held */
180 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
181                         char *newname)
182 {
183         struct cfg80211_registered_device *drv;
184         int wiphy_idx, taken = -1, result, digits;
185
186         assert_cfg80211_lock();
187
188         /* prohibit calling the thing phy%d when %d is not its number */
189         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
190         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
191                 /* count number of places needed to print wiphy_idx */
192                 digits = 1;
193                 while (wiphy_idx /= 10)
194                         digits++;
195                 /*
196                  * deny the name if it is phy<idx> where <idx> is printed
197                  * without leading zeroes. taken == strlen(newname) here
198                  */
199                 if (taken == strlen(PHY_NAME) + digits)
200                         return -EINVAL;
201         }
202
203
204         /* Ignore nop renames */
205         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
206                 return 0;
207
208         /* Ensure another device does not already have this name. */
209         list_for_each_entry(drv, &cfg80211_drv_list, list)
210                 if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
211                         return -EINVAL;
212
213         result = device_rename(&rdev->wiphy.dev, newname);
214         if (result)
215                 return result;
216
217         if (rdev->wiphy.debugfsdir &&
218             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
219                             rdev->wiphy.debugfsdir,
220                             rdev->wiphy.debugfsdir->d_parent,
221                             newname))
222                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
223                        newname);
224
225         nl80211_notify_dev_rename(rdev);
226
227         return 0;
228 }
229
230 /* exported functions */
231
232 struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
233 {
234         static int wiphy_counter;
235
236         struct cfg80211_registered_device *drv;
237         int alloc_size;
238
239         WARN_ON(!ops->add_key && ops->del_key);
240         WARN_ON(ops->add_key && !ops->del_key);
241
242         alloc_size = sizeof(*drv) + sizeof_priv;
243
244         drv = kzalloc(alloc_size, GFP_KERNEL);
245         if (!drv)
246                 return NULL;
247
248         drv->ops = ops;
249
250         mutex_lock(&cfg80211_mutex);
251
252         drv->wiphy_idx = wiphy_counter++;
253
254         if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
255                 wiphy_counter--;
256                 mutex_unlock(&cfg80211_mutex);
257                 /* ugh, wrapped! */
258                 kfree(drv);
259                 return NULL;
260         }
261
262         mutex_unlock(&cfg80211_mutex);
263
264         /* give it a proper name */
265         dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
266
267         mutex_init(&drv->mtx);
268         mutex_init(&drv->devlist_mtx);
269         INIT_LIST_HEAD(&drv->netdev_list);
270         spin_lock_init(&drv->bss_lock);
271         INIT_LIST_HEAD(&drv->bss_list);
272
273         device_initialize(&drv->wiphy.dev);
274         drv->wiphy.dev.class = &ieee80211_class;
275         drv->wiphy.dev.platform_data = drv;
276
277         /*
278          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
279          * Fragmentation and RTS threshold are disabled by default with the
280          * special -1 value.
281          */
282         drv->wiphy.retry_short = 7;
283         drv->wiphy.retry_long = 4;
284         drv->wiphy.frag_threshold = (u32) -1;
285         drv->wiphy.rts_threshold = (u32) -1;
286
287         return &drv->wiphy;
288 }
289 EXPORT_SYMBOL(wiphy_new);
290
291 int wiphy_register(struct wiphy *wiphy)
292 {
293         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
294         int res;
295         enum ieee80211_band band;
296         struct ieee80211_supported_band *sband;
297         bool have_band = false;
298         int i;
299         u16 ifmodes = wiphy->interface_modes;
300
301         if (WARN_ON(wiphy->max_scan_ssids < 1))
302                 return -EINVAL;
303
304         /* sanity check ifmodes */
305         WARN_ON(!ifmodes);
306         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
307         if (WARN_ON(ifmodes != wiphy->interface_modes))
308                 wiphy->interface_modes = ifmodes;
309
310         /* sanity check supported bands/channels */
311         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
312                 sband = wiphy->bands[band];
313                 if (!sband)
314                         continue;
315
316                 sband->band = band;
317
318                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
319                         return -EINVAL;
320
321                 /*
322                  * Since we use a u32 for rate bitmaps in
323                  * ieee80211_get_response_rate, we cannot
324                  * have more than 32 legacy rates.
325                  */
326                 if (WARN_ON(sband->n_bitrates > 32))
327                         return -EINVAL;
328
329                 for (i = 0; i < sband->n_channels; i++) {
330                         sband->channels[i].orig_flags =
331                                 sband->channels[i].flags;
332                         sband->channels[i].orig_mag =
333                                 sband->channels[i].max_antenna_gain;
334                         sband->channels[i].orig_mpwr =
335                                 sband->channels[i].max_power;
336                         sband->channels[i].band = band;
337                 }
338
339                 have_band = true;
340         }
341
342         if (!have_band) {
343                 WARN_ON(1);
344                 return -EINVAL;
345         }
346
347         /* check and set up bitrates */
348         ieee80211_set_bitrate_flags(wiphy);
349
350         mutex_lock(&cfg80211_mutex);
351
352         /* set up regulatory info */
353         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
354
355         res = device_add(&drv->wiphy.dev);
356         if (res)
357                 goto out_unlock;
358
359         list_add(&drv->list, &cfg80211_drv_list);
360
361         /* add to debugfs */
362         drv->wiphy.debugfsdir =
363                 debugfs_create_dir(wiphy_name(&drv->wiphy),
364                                    ieee80211_debugfs_dir);
365         if (IS_ERR(drv->wiphy.debugfsdir))
366                 drv->wiphy.debugfsdir = NULL;
367
368         if (wiphy->custom_regulatory) {
369                 struct regulatory_request request;
370
371                 request.wiphy_idx = get_wiphy_idx(wiphy);
372                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
373                 request.alpha2[0] = '9';
374                 request.alpha2[1] = '9';
375
376                 nl80211_send_reg_change_event(&request);
377         }
378
379         cfg80211_debugfs_drv_add(drv);
380
381         res = 0;
382 out_unlock:
383         mutex_unlock(&cfg80211_mutex);
384         return res;
385 }
386 EXPORT_SYMBOL(wiphy_register);
387
388 void wiphy_unregister(struct wiphy *wiphy)
389 {
390         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
391
392         /* protect the device list */
393         mutex_lock(&cfg80211_mutex);
394
395         BUG_ON(!list_empty(&drv->netdev_list));
396
397         /*
398          * Try to grab drv->mtx. If a command is still in progress,
399          * hopefully the driver will refuse it since it's tearing
400          * down the device already. We wait for this command to complete
401          * before unlinking the item from the list.
402          * Note: as codified by the BUG_ON above we cannot get here if
403          * a virtual interface is still associated. Hence, we can only
404          * get to lock contention here if userspace issues a command
405          * that identified the hardware by wiphy index.
406          */
407         mutex_lock(&drv->mtx);
408         /* unlock again before freeing */
409         mutex_unlock(&drv->mtx);
410
411         cfg80211_debugfs_drv_del(drv);
412
413         /* If this device got a regulatory hint tell core its
414          * free to listen now to a new shiny device regulatory hint */
415         reg_device_remove(wiphy);
416
417         list_del(&drv->list);
418         device_del(&drv->wiphy.dev);
419         debugfs_remove(drv->wiphy.debugfsdir);
420
421         mutex_unlock(&cfg80211_mutex);
422 }
423 EXPORT_SYMBOL(wiphy_unregister);
424
425 void cfg80211_dev_free(struct cfg80211_registered_device *drv)
426 {
427         struct cfg80211_internal_bss *scan, *tmp;
428         mutex_destroy(&drv->mtx);
429         mutex_destroy(&drv->devlist_mtx);
430         list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
431                 cfg80211_put_bss(&scan->pub);
432         kfree(drv);
433 }
434
435 void wiphy_free(struct wiphy *wiphy)
436 {
437         put_device(&wiphy->dev);
438 }
439 EXPORT_SYMBOL(wiphy_free);
440
441 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
442                                          unsigned long state,
443                                          void *ndev)
444 {
445         struct net_device *dev = ndev;
446         struct cfg80211_registered_device *rdev;
447
448         if (!dev->ieee80211_ptr)
449                 return 0;
450
451         rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
452
453         WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);
454
455         switch (state) {
456         case NETDEV_REGISTER:
457                 mutex_lock(&rdev->devlist_mtx);
458                 list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
459                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
460                                       "phy80211")) {
461                         printk(KERN_ERR "wireless: failed to add phy80211 "
462                                 "symlink to netdev!\n");
463                 }
464                 dev->ieee80211_ptr->netdev = dev;
465 #ifdef CONFIG_WIRELESS_EXT
466                 dev->ieee80211_ptr->wext.default_key = -1;
467                 dev->ieee80211_ptr->wext.default_mgmt_key = -1;
468 #endif
469                 mutex_unlock(&rdev->devlist_mtx);
470                 break;
471         case NETDEV_GOING_DOWN:
472                 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
473                         break;
474                 if (!dev->ieee80211_ptr->ssid_len)
475                         break;
476                 cfg80211_leave_ibss(rdev, dev, true);
477                 break;
478         case NETDEV_UP:
479 #ifdef CONFIG_WIRELESS_EXT
480                 if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
481                         break;
482                 if (!dev->ieee80211_ptr->wext.ibss.ssid_len)
483                         break;
484                 cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext.ibss);
485                 break;
486 #endif
487         case NETDEV_UNREGISTER:
488                 mutex_lock(&rdev->devlist_mtx);
489                 if (!list_empty(&dev->ieee80211_ptr->list)) {
490                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
491                         list_del_init(&dev->ieee80211_ptr->list);
492                 }
493                 mutex_unlock(&rdev->devlist_mtx);
494                 break;
495         }
496
497         return 0;
498 }
499
500 static struct notifier_block cfg80211_netdev_notifier = {
501         .notifier_call = cfg80211_netdev_notifier_call,
502 };
503
504 static int cfg80211_init(void)
505 {
506         int err;
507
508         err = wiphy_sysfs_init();
509         if (err)
510                 goto out_fail_sysfs;
511
512         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
513         if (err)
514                 goto out_fail_notifier;
515
516         err = nl80211_init();
517         if (err)
518                 goto out_fail_nl80211;
519
520         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
521
522         err = regulatory_init();
523         if (err)
524                 goto out_fail_reg;
525
526         return 0;
527
528 out_fail_reg:
529         debugfs_remove(ieee80211_debugfs_dir);
530 out_fail_nl80211:
531         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
532 out_fail_notifier:
533         wiphy_sysfs_exit();
534 out_fail_sysfs:
535         return err;
536 }
537
538 subsys_initcall(cfg80211_init);
539
540 static void cfg80211_exit(void)
541 {
542         debugfs_remove(ieee80211_debugfs_dir);
543         nl80211_exit();
544         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
545         wiphy_sysfs_exit();
546         regulatory_exit();
547 }
548 module_exit(cfg80211_exit);