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1 | /* |
2 | * This is the linux wireless configuration interface. |
3 | * |
4 | * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> |
5 | */ |
6 | |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
8 | |
9 | #include <linux/if.h> |
10 | #include <linux/module.h> |
11 | #include <linux/err.h> |
12 | #include <linux/list.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/nl80211.h> |
15 | #include <linux/debugfs.h> |
16 | #include <linux/notifier.h> |
17 | #include <linux/device.h> |
18 | #include <linux/etherdevice.h> |
19 | #include <linux/rtnetlink.h> |
20 | #include <linux/sched.h> |
21 | #include <net/genetlink.h> |
22 | #include <net/cfg80211.h> |
23 | #include "nl80211.h" |
24 | #include "core.h" |
25 | #include "sysfs.h" |
26 | #include "debugfs.h" |
27 | #include "wext-compat.h" |
28 | #include "ethtool.h" |
29 | |
30 | /* name for sysfs, %d is appended */ |
31 | #define PHY_NAME "phy" |
32 | |
33 | MODULE_AUTHOR("Johannes Berg"); |
34 | MODULE_LICENSE("GPL"); |
35 | MODULE_DESCRIPTION("wireless configuration support"); |
36 | |
37 | /* RCU-protected (and cfg80211_mutex for writers) */ |
38 | LIST_HEAD(cfg80211_rdev_list); |
39 | int cfg80211_rdev_list_generation; |
40 | |
41 | DEFINE_MUTEX(cfg80211_mutex); |
42 | |
43 | /* for debugfs */ |
44 | static struct dentry *ieee80211_debugfs_dir; |
45 | |
46 | /* for the cleanup, scan and event works */ |
47 | struct workqueue_struct *cfg80211_wq; |
48 | |
49 | /* requires cfg80211_mutex to be held! */ |
50 | struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) |
51 | { |
52 | struct cfg80211_registered_device *result = NULL, *rdev; |
53 | |
54 | if (!wiphy_idx_valid(wiphy_idx)) |
55 | return NULL; |
56 | |
57 | assert_cfg80211_lock(); |
58 | |
59 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { |
60 | if (rdev->wiphy_idx == wiphy_idx) { |
61 | result = rdev; |
62 | break; |
63 | } |
64 | } |
65 | |
66 | return result; |
67 | } |
68 | |
69 | int get_wiphy_idx(struct wiphy *wiphy) |
70 | { |
71 | struct cfg80211_registered_device *rdev; |
72 | if (!wiphy) |
73 | return WIPHY_IDX_STALE; |
74 | rdev = wiphy_to_dev(wiphy); |
75 | return rdev->wiphy_idx; |
76 | } |
77 | |
78 | /* requires cfg80211_rdev_mutex to be held! */ |
79 | struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) |
80 | { |
81 | struct cfg80211_registered_device *rdev; |
82 | |
83 | if (!wiphy_idx_valid(wiphy_idx)) |
84 | return NULL; |
85 | |
86 | assert_cfg80211_lock(); |
87 | |
88 | rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); |
89 | if (!rdev) |
90 | return NULL; |
91 | return &rdev->wiphy; |
92 | } |
93 | |
94 | /* requires cfg80211_mutex to be held! */ |
95 | struct cfg80211_registered_device * |
96 | __cfg80211_rdev_from_info(struct genl_info *info) |
97 | { |
98 | int ifindex; |
99 | struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; |
100 | struct net_device *dev; |
101 | int err = -EINVAL; |
102 | |
103 | assert_cfg80211_lock(); |
104 | |
105 | if (info->attrs[NL80211_ATTR_WIPHY]) { |
106 | bywiphyidx = cfg80211_rdev_by_wiphy_idx( |
107 | nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); |
108 | err = -ENODEV; |
109 | } |
110 | |
111 | if (info->attrs[NL80211_ATTR_IFINDEX]) { |
112 | ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); |
113 | dev = dev_get_by_index(genl_info_net(info), ifindex); |
114 | if (dev) { |
115 | if (dev->ieee80211_ptr) |
116 | byifidx = |
117 | wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
118 | dev_put(dev); |
119 | } |
120 | err = -ENODEV; |
121 | } |
122 | |
123 | if (bywiphyidx && byifidx) { |
124 | if (bywiphyidx != byifidx) |
125 | return ERR_PTR(-EINVAL); |
126 | else |
127 | return bywiphyidx; /* == byifidx */ |
128 | } |
129 | if (bywiphyidx) |
130 | return bywiphyidx; |
131 | |
132 | if (byifidx) |
133 | return byifidx; |
134 | |
135 | return ERR_PTR(err); |
136 | } |
137 | |
138 | struct cfg80211_registered_device * |
139 | cfg80211_get_dev_from_info(struct genl_info *info) |
140 | { |
141 | struct cfg80211_registered_device *rdev; |
142 | |
143 | mutex_lock(&cfg80211_mutex); |
144 | rdev = __cfg80211_rdev_from_info(info); |
145 | |
146 | /* if it is not an error we grab the lock on |
147 | * it to assure it won't be going away while |
148 | * we operate on it */ |
149 | if (!IS_ERR(rdev)) |
150 | mutex_lock(&rdev->mtx); |
151 | |
152 | mutex_unlock(&cfg80211_mutex); |
153 | |
154 | return rdev; |
155 | } |
156 | |
157 | struct cfg80211_registered_device * |
158 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) |
159 | { |
160 | struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); |
161 | struct net_device *dev; |
162 | |
163 | mutex_lock(&cfg80211_mutex); |
164 | dev = dev_get_by_index(net, ifindex); |
165 | if (!dev) |
166 | goto out; |
167 | if (dev->ieee80211_ptr) { |
168 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
169 | mutex_lock(&rdev->mtx); |
170 | } else |
171 | rdev = ERR_PTR(-ENODEV); |
172 | dev_put(dev); |
173 | out: |
174 | mutex_unlock(&cfg80211_mutex); |
175 | return rdev; |
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 *rdev2; |
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(rdev2, &cfg80211_rdev_list, list) |
209 | if (strcmp(newname, dev_name(&rdev2->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 | pr_err("failed to rename debugfs dir to %s!\n", newname); |
222 | |
223 | nl80211_notify_dev_rename(rdev); |
224 | |
225 | return 0; |
226 | } |
227 | |
228 | int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, |
229 | struct net *net) |
230 | { |
231 | struct wireless_dev *wdev; |
232 | int err = 0; |
233 | |
234 | if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) |
235 | return -EOPNOTSUPP; |
236 | |
237 | list_for_each_entry(wdev, &rdev->netdev_list, list) { |
238 | wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; |
239 | err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); |
240 | if (err) |
241 | break; |
242 | wdev->netdev->features |= NETIF_F_NETNS_LOCAL; |
243 | } |
244 | |
245 | if (err) { |
246 | /* failed -- clean up to old netns */ |
247 | net = wiphy_net(&rdev->wiphy); |
248 | |
249 | list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list, |
250 | list) { |
251 | wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; |
252 | err = dev_change_net_namespace(wdev->netdev, net, |
253 | "wlan%d"); |
254 | WARN_ON(err); |
255 | wdev->netdev->features |= NETIF_F_NETNS_LOCAL; |
256 | } |
257 | |
258 | return err; |
259 | } |
260 | |
261 | wiphy_net_set(&rdev->wiphy, net); |
262 | |
263 | err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); |
264 | WARN_ON(err); |
265 | |
266 | return 0; |
267 | } |
268 | |
269 | static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) |
270 | { |
271 | struct cfg80211_registered_device *rdev = data; |
272 | |
273 | rdev->ops->rfkill_poll(&rdev->wiphy); |
274 | } |
275 | |
276 | static int cfg80211_rfkill_set_block(void *data, bool blocked) |
277 | { |
278 | struct cfg80211_registered_device *rdev = data; |
279 | struct wireless_dev *wdev; |
280 | |
281 | if (!blocked) |
282 | return 0; |
283 | |
284 | rtnl_lock(); |
285 | mutex_lock(&rdev->devlist_mtx); |
286 | |
287 | list_for_each_entry(wdev, &rdev->netdev_list, list) |
288 | dev_close(wdev->netdev); |
289 | |
290 | mutex_unlock(&rdev->devlist_mtx); |
291 | rtnl_unlock(); |
292 | |
293 | return 0; |
294 | } |
295 | |
296 | static void cfg80211_rfkill_sync_work(struct work_struct *work) |
297 | { |
298 | struct cfg80211_registered_device *rdev; |
299 | |
300 | rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); |
301 | cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); |
302 | } |
303 | |
304 | static void cfg80211_event_work(struct work_struct *work) |
305 | { |
306 | struct cfg80211_registered_device *rdev; |
307 | |
308 | rdev = container_of(work, struct cfg80211_registered_device, |
309 | event_work); |
310 | |
311 | rtnl_lock(); |
312 | cfg80211_lock_rdev(rdev); |
313 | |
314 | cfg80211_process_rdev_events(rdev); |
315 | cfg80211_unlock_rdev(rdev); |
316 | rtnl_unlock(); |
317 | } |
318 | |
319 | /* exported functions */ |
320 | |
321 | struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) |
322 | { |
323 | static int wiphy_counter; |
324 | |
325 | struct cfg80211_registered_device *rdev; |
326 | int alloc_size; |
327 | |
328 | WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); |
329 | WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); |
330 | WARN_ON(ops->connect && !ops->disconnect); |
331 | WARN_ON(ops->join_ibss && !ops->leave_ibss); |
332 | WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); |
333 | WARN_ON(ops->add_station && !ops->del_station); |
334 | WARN_ON(ops->add_mpath && !ops->del_mpath); |
335 | WARN_ON(ops->join_mesh && !ops->leave_mesh); |
336 | |
337 | alloc_size = sizeof(*rdev) + sizeof_priv; |
338 | |
339 | rdev = kzalloc(alloc_size, GFP_KERNEL); |
340 | if (!rdev) |
341 | return NULL; |
342 | |
343 | rdev->ops = ops; |
344 | |
345 | mutex_lock(&cfg80211_mutex); |
346 | |
347 | rdev->wiphy_idx = wiphy_counter++; |
348 | |
349 | if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { |
350 | wiphy_counter--; |
351 | mutex_unlock(&cfg80211_mutex); |
352 | /* ugh, wrapped! */ |
353 | kfree(rdev); |
354 | return NULL; |
355 | } |
356 | |
357 | mutex_unlock(&cfg80211_mutex); |
358 | |
359 | /* give it a proper name */ |
360 | dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); |
361 | |
362 | mutex_init(&rdev->mtx); |
363 | mutex_init(&rdev->devlist_mtx); |
364 | INIT_LIST_HEAD(&rdev->netdev_list); |
365 | spin_lock_init(&rdev->bss_lock); |
366 | INIT_LIST_HEAD(&rdev->bss_list); |
367 | INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); |
368 | |
369 | #ifdef CONFIG_CFG80211_WEXT |
370 | rdev->wiphy.wext = &cfg80211_wext_handler; |
371 | #endif |
372 | |
373 | device_initialize(&rdev->wiphy.dev); |
374 | rdev->wiphy.dev.class = &ieee80211_class; |
375 | rdev->wiphy.dev.platform_data = rdev; |
376 | |
377 | #ifdef CONFIG_CFG80211_DEFAULT_PS |
378 | rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; |
379 | #endif |
380 | |
381 | wiphy_net_set(&rdev->wiphy, &init_net); |
382 | |
383 | rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; |
384 | rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), |
385 | &rdev->wiphy.dev, RFKILL_TYPE_WLAN, |
386 | &rdev->rfkill_ops, rdev); |
387 | |
388 | if (!rdev->rfkill) { |
389 | kfree(rdev); |
390 | return NULL; |
391 | } |
392 | |
393 | INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); |
394 | INIT_WORK(&rdev->conn_work, cfg80211_conn_work); |
395 | INIT_WORK(&rdev->event_work, cfg80211_event_work); |
396 | |
397 | init_waitqueue_head(&rdev->dev_wait); |
398 | |
399 | /* |
400 | * Initialize wiphy parameters to IEEE 802.11 MIB default values. |
401 | * Fragmentation and RTS threshold are disabled by default with the |
402 | * special -1 value. |
403 | */ |
404 | rdev->wiphy.retry_short = 7; |
405 | rdev->wiphy.retry_long = 4; |
406 | rdev->wiphy.frag_threshold = (u32) -1; |
407 | rdev->wiphy.rts_threshold = (u32) -1; |
408 | rdev->wiphy.coverage_class = 0; |
409 | |
410 | return &rdev->wiphy; |
411 | } |
412 | EXPORT_SYMBOL(wiphy_new); |
413 | |
414 | int wiphy_register(struct wiphy *wiphy) |
415 | { |
416 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
417 | int res; |
418 | enum ieee80211_band band; |
419 | struct ieee80211_supported_band *sband; |
420 | bool have_band = false; |
421 | int i; |
422 | u16 ifmodes = wiphy->interface_modes; |
423 | |
424 | if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) |
425 | return -EINVAL; |
426 | |
427 | if (WARN_ON(wiphy->addresses && |
428 | !is_zero_ether_addr(wiphy->perm_addr) && |
429 | memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, |
430 | ETH_ALEN))) |
431 | return -EINVAL; |
432 | |
433 | if (wiphy->addresses) |
434 | memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); |
435 | |
436 | /* sanity check ifmodes */ |
437 | WARN_ON(!ifmodes); |
438 | ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; |
439 | if (WARN_ON(ifmodes != wiphy->interface_modes)) |
440 | wiphy->interface_modes = ifmodes; |
441 | |
442 | /* sanity check supported bands/channels */ |
443 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
444 | sband = wiphy->bands[band]; |
445 | if (!sband) |
446 | continue; |
447 | |
448 | sband->band = band; |
449 | |
450 | if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) |
451 | return -EINVAL; |
452 | |
453 | /* |
454 | * Since we use a u32 for rate bitmaps in |
455 | * ieee80211_get_response_rate, we cannot |
456 | * have more than 32 legacy rates. |
457 | */ |
458 | if (WARN_ON(sband->n_bitrates > 32)) |
459 | return -EINVAL; |
460 | |
461 | for (i = 0; i < sband->n_channels; i++) { |
462 | sband->channels[i].orig_flags = |
463 | sband->channels[i].flags; |
464 | sband->channels[i].orig_mag = |
465 | sband->channels[i].max_antenna_gain; |
466 | sband->channels[i].orig_mpwr = |
467 | sband->channels[i].max_power; |
468 | sband->channels[i].band = band; |
469 | } |
470 | |
471 | have_band = true; |
472 | } |
473 | |
474 | if (!have_band) { |
475 | WARN_ON(1); |
476 | return -EINVAL; |
477 | } |
478 | |
479 | /* check and set up bitrates */ |
480 | ieee80211_set_bitrate_flags(wiphy); |
481 | |
482 | mutex_lock(&cfg80211_mutex); |
483 | |
484 | res = device_add(&rdev->wiphy.dev); |
485 | if (res) { |
486 | mutex_unlock(&cfg80211_mutex); |
487 | return res; |
488 | } |
489 | |
490 | /* set up regulatory info */ |
491 | wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); |
492 | |
493 | list_add_rcu(&rdev->list, &cfg80211_rdev_list); |
494 | cfg80211_rdev_list_generation++; |
495 | |
496 | /* add to debugfs */ |
497 | rdev->wiphy.debugfsdir = |
498 | debugfs_create_dir(wiphy_name(&rdev->wiphy), |
499 | ieee80211_debugfs_dir); |
500 | if (IS_ERR(rdev->wiphy.debugfsdir)) |
501 | rdev->wiphy.debugfsdir = NULL; |
502 | |
503 | if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { |
504 | struct regulatory_request request; |
505 | |
506 | request.wiphy_idx = get_wiphy_idx(wiphy); |
507 | request.initiator = NL80211_REGDOM_SET_BY_DRIVER; |
508 | request.alpha2[0] = '9'; |
509 | request.alpha2[1] = '9'; |
510 | |
511 | nl80211_send_reg_change_event(&request); |
512 | } |
513 | |
514 | cfg80211_debugfs_rdev_add(rdev); |
515 | mutex_unlock(&cfg80211_mutex); |
516 | |
517 | /* |
518 | * due to a locking dependency this has to be outside of the |
519 | * cfg80211_mutex lock |
520 | */ |
521 | res = rfkill_register(rdev->rfkill); |
522 | if (res) |
523 | goto out_rm_dev; |
524 | |
525 | return 0; |
526 | |
527 | out_rm_dev: |
528 | device_del(&rdev->wiphy.dev); |
529 | return res; |
530 | } |
531 | EXPORT_SYMBOL(wiphy_register); |
532 | |
533 | void wiphy_rfkill_start_polling(struct wiphy *wiphy) |
534 | { |
535 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
536 | |
537 | if (!rdev->ops->rfkill_poll) |
538 | return; |
539 | rdev->rfkill_ops.poll = cfg80211_rfkill_poll; |
540 | rfkill_resume_polling(rdev->rfkill); |
541 | } |
542 | EXPORT_SYMBOL(wiphy_rfkill_start_polling); |
543 | |
544 | void wiphy_rfkill_stop_polling(struct wiphy *wiphy) |
545 | { |
546 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
547 | |
548 | rfkill_pause_polling(rdev->rfkill); |
549 | } |
550 | EXPORT_SYMBOL(wiphy_rfkill_stop_polling); |
551 | |
552 | void wiphy_unregister(struct wiphy *wiphy) |
553 | { |
554 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
555 | |
556 | rfkill_unregister(rdev->rfkill); |
557 | |
558 | /* protect the device list */ |
559 | mutex_lock(&cfg80211_mutex); |
560 | |
561 | wait_event(rdev->dev_wait, ({ |
562 | int __count; |
563 | mutex_lock(&rdev->devlist_mtx); |
564 | __count = rdev->opencount; |
565 | mutex_unlock(&rdev->devlist_mtx); |
566 | __count == 0;})); |
567 | |
568 | mutex_lock(&rdev->devlist_mtx); |
569 | BUG_ON(!list_empty(&rdev->netdev_list)); |
570 | mutex_unlock(&rdev->devlist_mtx); |
571 | |
572 | /* |
573 | * First remove the hardware from everywhere, this makes |
574 | * it impossible to find from userspace. |
575 | */ |
576 | debugfs_remove_recursive(rdev->wiphy.debugfsdir); |
577 | list_del_rcu(&rdev->list); |
578 | synchronize_rcu(); |
579 | |
580 | /* |
581 | * Try to grab rdev->mtx. If a command is still in progress, |
582 | * hopefully the driver will refuse it since it's tearing |
583 | * down the device already. We wait for this command to complete |
584 | * before unlinking the item from the list. |
585 | * Note: as codified by the BUG_ON above we cannot get here if |
586 | * a virtual interface is still present. Hence, we can only get |
587 | * to lock contention here if userspace issues a command that |
588 | * identified the hardware by wiphy index. |
589 | */ |
590 | cfg80211_lock_rdev(rdev); |
591 | /* nothing */ |
592 | cfg80211_unlock_rdev(rdev); |
593 | |
594 | /* If this device got a regulatory hint tell core its |
595 | * free to listen now to a new shiny device regulatory hint */ |
596 | reg_device_remove(wiphy); |
597 | |
598 | cfg80211_rdev_list_generation++; |
599 | device_del(&rdev->wiphy.dev); |
600 | |
601 | mutex_unlock(&cfg80211_mutex); |
602 | |
603 | flush_work(&rdev->scan_done_wk); |
604 | cancel_work_sync(&rdev->conn_work); |
605 | flush_work(&rdev->event_work); |
606 | } |
607 | EXPORT_SYMBOL(wiphy_unregister); |
608 | |
609 | void cfg80211_dev_free(struct cfg80211_registered_device *rdev) |
610 | { |
611 | struct cfg80211_internal_bss *scan, *tmp; |
612 | rfkill_destroy(rdev->rfkill); |
613 | mutex_destroy(&rdev->mtx); |
614 | mutex_destroy(&rdev->devlist_mtx); |
615 | list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) |
616 | cfg80211_put_bss(&scan->pub); |
617 | kfree(rdev); |
618 | } |
619 | |
620 | void wiphy_free(struct wiphy *wiphy) |
621 | { |
622 | put_device(&wiphy->dev); |
623 | } |
624 | EXPORT_SYMBOL(wiphy_free); |
625 | |
626 | void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) |
627 | { |
628 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
629 | |
630 | if (rfkill_set_hw_state(rdev->rfkill, blocked)) |
631 | schedule_work(&rdev->rfkill_sync); |
632 | } |
633 | EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); |
634 | |
635 | static void wdev_cleanup_work(struct work_struct *work) |
636 | { |
637 | struct wireless_dev *wdev; |
638 | struct cfg80211_registered_device *rdev; |
639 | |
640 | wdev = container_of(work, struct wireless_dev, cleanup_work); |
641 | rdev = wiphy_to_dev(wdev->wiphy); |
642 | |
643 | cfg80211_lock_rdev(rdev); |
644 | |
645 | if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { |
646 | rdev->scan_req->aborted = true; |
647 | ___cfg80211_scan_done(rdev, true); |
648 | } |
649 | |
650 | cfg80211_unlock_rdev(rdev); |
651 | |
652 | mutex_lock(&rdev->devlist_mtx); |
653 | rdev->opencount--; |
654 | mutex_unlock(&rdev->devlist_mtx); |
655 | wake_up(&rdev->dev_wait); |
656 | |
657 | dev_put(wdev->netdev); |
658 | } |
659 | |
660 | static struct device_type wiphy_type = { |
661 | .name = "wlan", |
662 | }; |
663 | |
664 | static int cfg80211_netdev_notifier_call(struct notifier_block * nb, |
665 | unsigned long state, |
666 | void *ndev) |
667 | { |
668 | struct net_device *dev = ndev; |
669 | struct wireless_dev *wdev = dev->ieee80211_ptr; |
670 | struct cfg80211_registered_device *rdev; |
671 | |
672 | if (!wdev) |
673 | return NOTIFY_DONE; |
674 | |
675 | rdev = wiphy_to_dev(wdev->wiphy); |
676 | |
677 | WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); |
678 | |
679 | switch (state) { |
680 | case NETDEV_POST_INIT: |
681 | SET_NETDEV_DEVTYPE(dev, &wiphy_type); |
682 | break; |
683 | case NETDEV_REGISTER: |
684 | /* |
685 | * NB: cannot take rdev->mtx here because this may be |
686 | * called within code protected by it when interfaces |
687 | * are added with nl80211. |
688 | */ |
689 | mutex_init(&wdev->mtx); |
690 | INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); |
691 | INIT_LIST_HEAD(&wdev->event_list); |
692 | spin_lock_init(&wdev->event_lock); |
693 | INIT_LIST_HEAD(&wdev->mgmt_registrations); |
694 | spin_lock_init(&wdev->mgmt_registrations_lock); |
695 | |
696 | mutex_lock(&rdev->devlist_mtx); |
697 | list_add_rcu(&wdev->list, &rdev->netdev_list); |
698 | rdev->devlist_generation++; |
699 | /* can only change netns with wiphy */ |
700 | dev->features |= NETIF_F_NETNS_LOCAL; |
701 | |
702 | if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, |
703 | "phy80211")) { |
704 | pr_err("failed to add phy80211 symlink to netdev!\n"); |
705 | } |
706 | wdev->netdev = dev; |
707 | wdev->sme_state = CFG80211_SME_IDLE; |
708 | mutex_unlock(&rdev->devlist_mtx); |
709 | #ifdef CONFIG_CFG80211_WEXT |
710 | wdev->wext.default_key = -1; |
711 | wdev->wext.default_mgmt_key = -1; |
712 | wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; |
713 | #endif |
714 | |
715 | if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) |
716 | wdev->ps = true; |
717 | else |
718 | wdev->ps = false; |
719 | /* allow mac80211 to determine the timeout */ |
720 | wdev->ps_timeout = -1; |
721 | if (rdev->ops->set_power_mgmt) |
722 | if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, |
723 | wdev->ps, |
724 | wdev->ps_timeout)) { |
725 | /* assume this means it's off */ |
726 | wdev->ps = false; |
727 | } |
728 | |
729 | if (!dev->ethtool_ops) |
730 | dev->ethtool_ops = &cfg80211_ethtool_ops; |
731 | |
732 | if ((wdev->iftype == NL80211_IFTYPE_STATION || |
733 | wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || |
734 | wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) |
735 | dev->priv_flags |= IFF_DONT_BRIDGE; |
736 | break; |
737 | case NETDEV_GOING_DOWN: |
738 | switch (wdev->iftype) { |
739 | case NL80211_IFTYPE_ADHOC: |
740 | cfg80211_leave_ibss(rdev, dev, true); |
741 | break; |
742 | case NL80211_IFTYPE_P2P_CLIENT: |
743 | case NL80211_IFTYPE_STATION: |
744 | wdev_lock(wdev); |
745 | #ifdef CONFIG_CFG80211_WEXT |
746 | kfree(wdev->wext.ie); |
747 | wdev->wext.ie = NULL; |
748 | wdev->wext.ie_len = 0; |
749 | wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; |
750 | #endif |
751 | __cfg80211_disconnect(rdev, dev, |
752 | WLAN_REASON_DEAUTH_LEAVING, true); |
753 | cfg80211_mlme_down(rdev, dev); |
754 | wdev_unlock(wdev); |
755 | break; |
756 | case NL80211_IFTYPE_MESH_POINT: |
757 | cfg80211_leave_mesh(rdev, dev); |
758 | break; |
759 | default: |
760 | break; |
761 | } |
762 | break; |
763 | case NETDEV_DOWN: |
764 | dev_hold(dev); |
765 | queue_work(cfg80211_wq, &wdev->cleanup_work); |
766 | break; |
767 | case NETDEV_UP: |
768 | /* |
769 | * If we have a really quick DOWN/UP succession we may |
770 | * have this work still pending ... cancel it and see |
771 | * if it was pending, in which case we need to account |
772 | * for some of the work it would have done. |
773 | */ |
774 | if (cancel_work_sync(&wdev->cleanup_work)) { |
775 | mutex_lock(&rdev->devlist_mtx); |
776 | rdev->opencount--; |
777 | mutex_unlock(&rdev->devlist_mtx); |
778 | dev_put(dev); |
779 | } |
780 | cfg80211_lock_rdev(rdev); |
781 | mutex_lock(&rdev->devlist_mtx); |
782 | wdev_lock(wdev); |
783 | switch (wdev->iftype) { |
784 | #ifdef CONFIG_CFG80211_WEXT |
785 | case NL80211_IFTYPE_ADHOC: |
786 | cfg80211_ibss_wext_join(rdev, wdev); |
787 | break; |
788 | case NL80211_IFTYPE_STATION: |
789 | cfg80211_mgd_wext_connect(rdev, wdev); |
790 | break; |
791 | #endif |
792 | #ifdef CONFIG_MAC80211_MESH |
793 | case NL80211_IFTYPE_MESH_POINT: |
794 | { |
795 | /* backward compat code... */ |
796 | struct mesh_setup setup; |
797 | memcpy(&setup, &default_mesh_setup, |
798 | sizeof(setup)); |
799 | /* back compat only needed for mesh_id */ |
800 | setup.mesh_id = wdev->ssid; |
801 | setup.mesh_id_len = wdev->mesh_id_up_len; |
802 | if (wdev->mesh_id_up_len) |
803 | __cfg80211_join_mesh(rdev, dev, |
804 | &setup, |
805 | &default_mesh_config); |
806 | break; |
807 | } |
808 | #endif |
809 | default: |
810 | break; |
811 | } |
812 | wdev_unlock(wdev); |
813 | rdev->opencount++; |
814 | mutex_unlock(&rdev->devlist_mtx); |
815 | cfg80211_unlock_rdev(rdev); |
816 | break; |
817 | case NETDEV_UNREGISTER: |
818 | /* |
819 | * NB: cannot take rdev->mtx here because this may be |
820 | * called within code protected by it when interfaces |
821 | * are removed with nl80211. |
822 | */ |
823 | mutex_lock(&rdev->devlist_mtx); |
824 | /* |
825 | * It is possible to get NETDEV_UNREGISTER |
826 | * multiple times. To detect that, check |
827 | * that the interface is still on the list |
828 | * of registered interfaces, and only then |
829 | * remove and clean it up. |
830 | */ |
831 | if (!list_empty(&wdev->list)) { |
832 | sysfs_remove_link(&dev->dev.kobj, "phy80211"); |
833 | list_del_rcu(&wdev->list); |
834 | rdev->devlist_generation++; |
835 | cfg80211_mlme_purge_registrations(wdev); |
836 | #ifdef CONFIG_CFG80211_WEXT |
837 | kfree(wdev->wext.keys); |
838 | #endif |
839 | } |
840 | mutex_unlock(&rdev->devlist_mtx); |
841 | /* |
842 | * synchronise (so that we won't find this netdev |
843 | * from other code any more) and then clear the list |
844 | * head so that the above code can safely check for |
845 | * !list_empty() to avoid double-cleanup. |
846 | */ |
847 | synchronize_rcu(); |
848 | INIT_LIST_HEAD(&wdev->list); |
849 | break; |
850 | case NETDEV_PRE_UP: |
851 | if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) |
852 | return notifier_from_errno(-EOPNOTSUPP); |
853 | if (rfkill_blocked(rdev->rfkill)) |
854 | return notifier_from_errno(-ERFKILL); |
855 | break; |
856 | } |
857 | |
858 | return NOTIFY_DONE; |
859 | } |
860 | |
861 | static struct notifier_block cfg80211_netdev_notifier = { |
862 | .notifier_call = cfg80211_netdev_notifier_call, |
863 | }; |
864 | |
865 | static void __net_exit cfg80211_pernet_exit(struct net *net) |
866 | { |
867 | struct cfg80211_registered_device *rdev; |
868 | |
869 | rtnl_lock(); |
870 | mutex_lock(&cfg80211_mutex); |
871 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { |
872 | if (net_eq(wiphy_net(&rdev->wiphy), net)) |
873 | WARN_ON(cfg80211_switch_netns(rdev, &init_net)); |
874 | } |
875 | mutex_unlock(&cfg80211_mutex); |
876 | rtnl_unlock(); |
877 | } |
878 | |
879 | static struct pernet_operations cfg80211_pernet_ops = { |
880 | .exit = cfg80211_pernet_exit, |
881 | }; |
882 | |
883 | static int __init cfg80211_init(void) |
884 | { |
885 | int err; |
886 | |
887 | err = register_pernet_device(&cfg80211_pernet_ops); |
888 | if (err) |
889 | goto out_fail_pernet; |
890 | |
891 | err = wiphy_sysfs_init(); |
892 | if (err) |
893 | goto out_fail_sysfs; |
894 | |
895 | err = register_netdevice_notifier(&cfg80211_netdev_notifier); |
896 | if (err) |
897 | goto out_fail_notifier; |
898 | |
899 | err = nl80211_init(); |
900 | if (err) |
901 | goto out_fail_nl80211; |
902 | |
903 | ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); |
904 | |
905 | err = regulatory_init(); |
906 | if (err) |
907 | goto out_fail_reg; |
908 | |
909 | cfg80211_wq = create_singlethread_workqueue("cfg80211"); |
910 | if (!cfg80211_wq) |
911 | goto out_fail_wq; |
912 | |
913 | return 0; |
914 | |
915 | out_fail_wq: |
916 | regulatory_exit(); |
917 | out_fail_reg: |
918 | debugfs_remove(ieee80211_debugfs_dir); |
919 | out_fail_nl80211: |
920 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); |
921 | out_fail_notifier: |
922 | wiphy_sysfs_exit(); |
923 | out_fail_sysfs: |
924 | unregister_pernet_device(&cfg80211_pernet_ops); |
925 | out_fail_pernet: |
926 | return err; |
927 | } |
928 | subsys_initcall(cfg80211_init); |
929 | |
930 | static void __exit cfg80211_exit(void) |
931 | { |
932 | debugfs_remove(ieee80211_debugfs_dir); |
933 | nl80211_exit(); |
934 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); |
935 | wiphy_sysfs_exit(); |
936 | regulatory_exit(); |
937 | unregister_pernet_device(&cfg80211_pernet_ops); |
938 | destroy_workqueue(cfg80211_wq); |
939 | } |
940 | module_exit(cfg80211_exit); |
941 |
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