core.c 25 KB

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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. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  7. #include <linux/if.h>
  8. #include <linux/module.h>
  9. #include <linux/err.h>
  10. #include <linux/list.h>
  11. #include <linux/slab.h>
  12. #include <linux/nl80211.h>
  13. #include <linux/debugfs.h>
  14. #include <linux/notifier.h>
  15. #include <linux/device.h>
  16. #include <linux/etherdevice.h>
  17. #include <linux/rtnetlink.h>
  18. #include <linux/sched.h>
  19. #include <net/genetlink.h>
  20. #include <net/cfg80211.h>
  21. #include "nl80211.h"
  22. #include "core.h"
  23. #include "sysfs.h"
  24. #include "debugfs.h"
  25. #include "wext-compat.h"
  26. #include "ethtool.h"
  27. #include "rdev-ops.h"
  28. /* name for sysfs, %d is appended */
  29. #define PHY_NAME "phy"
  30. MODULE_AUTHOR("Johannes Berg");
  31. MODULE_LICENSE("GPL");
  32. MODULE_DESCRIPTION("wireless configuration support");
  33. MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  34. /* RCU-protected (and RTNL for writers) */
  35. LIST_HEAD(cfg80211_rdev_list);
  36. int cfg80211_rdev_list_generation;
  37. /* for debugfs */
  38. static struct dentry *ieee80211_debugfs_dir;
  39. /* for the cleanup, scan and event works */
  40. struct workqueue_struct *cfg80211_wq;
  41. static bool cfg80211_disable_40mhz_24ghz;
  42. module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  43. MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  44. "Disable 40MHz support in the 2.4GHz band");
  45. struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  46. {
  47. struct cfg80211_registered_device *result = NULL, *rdev;
  48. ASSERT_RTNL();
  49. list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  50. if (rdev->wiphy_idx == wiphy_idx) {
  51. result = rdev;
  52. break;
  53. }
  54. }
  55. return result;
  56. }
  57. int get_wiphy_idx(struct wiphy *wiphy)
  58. {
  59. struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  60. return rdev->wiphy_idx;
  61. }
  62. struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  63. {
  64. struct cfg80211_registered_device *rdev;
  65. ASSERT_RTNL();
  66. rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  67. if (!rdev)
  68. return NULL;
  69. return &rdev->wiphy;
  70. }
  71. int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
  72. char *newname)
  73. {
  74. struct cfg80211_registered_device *rdev2;
  75. int wiphy_idx, taken = -1, result, digits;
  76. ASSERT_RTNL();
  77. /* prohibit calling the thing phy%d when %d is not its number */
  78. sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  79. if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
  80. /* count number of places needed to print wiphy_idx */
  81. digits = 1;
  82. while (wiphy_idx /= 10)
  83. digits++;
  84. /*
  85. * deny the name if it is phy<idx> where <idx> is printed
  86. * without leading zeroes. taken == strlen(newname) here
  87. */
  88. if (taken == strlen(PHY_NAME) + digits)
  89. return -EINVAL;
  90. }
  91. /* Ignore nop renames */
  92. if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
  93. return 0;
  94. /* Ensure another device does not already have this name. */
  95. list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
  96. if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
  97. return -EINVAL;
  98. result = device_rename(&rdev->wiphy.dev, newname);
  99. if (result)
  100. return result;
  101. if (rdev->wiphy.debugfsdir &&
  102. !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
  103. rdev->wiphy.debugfsdir,
  104. rdev->wiphy.debugfsdir->d_parent,
  105. newname))
  106. pr_err("failed to rename debugfs dir to %s!\n", newname);
  107. nl80211_notify_dev_rename(rdev);
  108. return 0;
  109. }
  110. int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
  111. struct net *net)
  112. {
  113. struct wireless_dev *wdev;
  114. int err = 0;
  115. if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
  116. return -EOPNOTSUPP;
  117. list_for_each_entry(wdev, &rdev->wdev_list, list) {
  118. if (!wdev->netdev)
  119. continue;
  120. wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
  121. err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
  122. if (err)
  123. break;
  124. wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
  125. }
  126. if (err) {
  127. /* failed -- clean up to old netns */
  128. net = wiphy_net(&rdev->wiphy);
  129. list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
  130. list) {
  131. if (!wdev->netdev)
  132. continue;
  133. wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
  134. err = dev_change_net_namespace(wdev->netdev, net,
  135. "wlan%d");
  136. WARN_ON(err);
  137. wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
  138. }
  139. return err;
  140. }
  141. wiphy_net_set(&rdev->wiphy, net);
  142. err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
  143. WARN_ON(err);
  144. return 0;
  145. }
  146. static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
  147. {
  148. struct cfg80211_registered_device *rdev = data;
  149. rdev_rfkill_poll(rdev);
  150. }
  151. void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
  152. struct wireless_dev *wdev)
  153. {
  154. ASSERT_RTNL();
  155. if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
  156. return;
  157. if (!wdev->p2p_started)
  158. return;
  159. rdev_stop_p2p_device(rdev, wdev);
  160. wdev->p2p_started = false;
  161. rdev->opencount--;
  162. if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
  163. /*
  164. * If the scan request wasn't notified as done, set it
  165. * to aborted and leak it after a warning. The driver
  166. * should have notified us that it ended at the latest
  167. * during rdev_stop_p2p_device().
  168. */
  169. if (WARN_ON(!rdev->scan_req->notified))
  170. rdev->scan_req->aborted = true;
  171. ___cfg80211_scan_done(rdev, !rdev->scan_req->notified);
  172. }
  173. }
  174. static int cfg80211_rfkill_set_block(void *data, bool blocked)
  175. {
  176. struct cfg80211_registered_device *rdev = data;
  177. struct wireless_dev *wdev;
  178. if (!blocked)
  179. return 0;
  180. rtnl_lock();
  181. list_for_each_entry(wdev, &rdev->wdev_list, list) {
  182. if (wdev->netdev) {
  183. dev_close(wdev->netdev);
  184. continue;
  185. }
  186. /* otherwise, check iftype */
  187. switch (wdev->iftype) {
  188. case NL80211_IFTYPE_P2P_DEVICE:
  189. cfg80211_stop_p2p_device(rdev, wdev);
  190. break;
  191. default:
  192. break;
  193. }
  194. }
  195. rtnl_unlock();
  196. return 0;
  197. }
  198. static void cfg80211_rfkill_sync_work(struct work_struct *work)
  199. {
  200. struct cfg80211_registered_device *rdev;
  201. rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
  202. cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
  203. }
  204. static void cfg80211_event_work(struct work_struct *work)
  205. {
  206. struct cfg80211_registered_device *rdev;
  207. rdev = container_of(work, struct cfg80211_registered_device,
  208. event_work);
  209. rtnl_lock();
  210. cfg80211_process_rdev_events(rdev);
  211. rtnl_unlock();
  212. }
  213. /* exported functions */
  214. struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
  215. {
  216. static atomic_t wiphy_counter = ATOMIC_INIT(0);
  217. struct cfg80211_registered_device *rdev;
  218. int alloc_size;
  219. WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
  220. WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
  221. WARN_ON(ops->connect && !ops->disconnect);
  222. WARN_ON(ops->join_ibss && !ops->leave_ibss);
  223. WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
  224. WARN_ON(ops->add_station && !ops->del_station);
  225. WARN_ON(ops->add_mpath && !ops->del_mpath);
  226. WARN_ON(ops->join_mesh && !ops->leave_mesh);
  227. alloc_size = sizeof(*rdev) + sizeof_priv;
  228. rdev = kzalloc(alloc_size, GFP_KERNEL);
  229. if (!rdev)
  230. return NULL;
  231. rdev->ops = ops;
  232. rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
  233. if (unlikely(rdev->wiphy_idx < 0)) {
  234. /* ugh, wrapped! */
  235. atomic_dec(&wiphy_counter);
  236. kfree(rdev);
  237. return NULL;
  238. }
  239. /* atomic_inc_return makes it start at 1, make it start at 0 */
  240. rdev->wiphy_idx--;
  241. /* give it a proper name */
  242. dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
  243. INIT_LIST_HEAD(&rdev->wdev_list);
  244. INIT_LIST_HEAD(&rdev->beacon_registrations);
  245. spin_lock_init(&rdev->beacon_registrations_lock);
  246. spin_lock_init(&rdev->bss_lock);
  247. INIT_LIST_HEAD(&rdev->bss_list);
  248. INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
  249. INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
  250. INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
  251. cfg80211_dfs_channels_update_work);
  252. #ifdef CONFIG_CFG80211_WEXT
  253. rdev->wiphy.wext = &cfg80211_wext_handler;
  254. #endif
  255. device_initialize(&rdev->wiphy.dev);
  256. rdev->wiphy.dev.class = &ieee80211_class;
  257. rdev->wiphy.dev.platform_data = rdev;
  258. #ifdef CONFIG_CFG80211_DEFAULT_PS
  259. rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
  260. #endif
  261. wiphy_net_set(&rdev->wiphy, &init_net);
  262. rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
  263. rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
  264. &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
  265. &rdev->rfkill_ops, rdev);
  266. if (!rdev->rfkill) {
  267. kfree(rdev);
  268. return NULL;
  269. }
  270. INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
  271. INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
  272. INIT_WORK(&rdev->event_work, cfg80211_event_work);
  273. init_waitqueue_head(&rdev->dev_wait);
  274. /*
  275. * Initialize wiphy parameters to IEEE 802.11 MIB default values.
  276. * Fragmentation and RTS threshold are disabled by default with the
  277. * special -1 value.
  278. */
  279. rdev->wiphy.retry_short = 7;
  280. rdev->wiphy.retry_long = 4;
  281. rdev->wiphy.frag_threshold = (u32) -1;
  282. rdev->wiphy.rts_threshold = (u32) -1;
  283. rdev->wiphy.coverage_class = 0;
  284. rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
  285. return &rdev->wiphy;
  286. }
  287. EXPORT_SYMBOL(wiphy_new);
  288. static int wiphy_verify_combinations(struct wiphy *wiphy)
  289. {
  290. const struct ieee80211_iface_combination *c;
  291. int i, j;
  292. for (i = 0; i < wiphy->n_iface_combinations; i++) {
  293. u32 cnt = 0;
  294. u16 all_iftypes = 0;
  295. c = &wiphy->iface_combinations[i];
  296. /*
  297. * Combinations with just one interface aren't real,
  298. * however we make an exception for DFS.
  299. */
  300. if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
  301. return -EINVAL;
  302. /* Need at least one channel */
  303. if (WARN_ON(!c->num_different_channels))
  304. return -EINVAL;
  305. /*
  306. * Put a sane limit on maximum number of different
  307. * channels to simplify channel accounting code.
  308. */
  309. if (WARN_ON(c->num_different_channels >
  310. CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
  311. return -EINVAL;
  312. /* DFS only works on one channel. */
  313. if (WARN_ON(c->radar_detect_widths &&
  314. (c->num_different_channels > 1)))
  315. return -EINVAL;
  316. if (WARN_ON(!c->n_limits))
  317. return -EINVAL;
  318. for (j = 0; j < c->n_limits; j++) {
  319. u16 types = c->limits[j].types;
  320. /*
  321. * interface types shouldn't overlap, this is
  322. * used in cfg80211_can_change_interface()
  323. */
  324. if (WARN_ON(types & all_iftypes))
  325. return -EINVAL;
  326. all_iftypes |= types;
  327. if (WARN_ON(!c->limits[j].max))
  328. return -EINVAL;
  329. /* Shouldn't list software iftypes in combinations! */
  330. if (WARN_ON(wiphy->software_iftypes & types))
  331. return -EINVAL;
  332. /* Only a single P2P_DEVICE can be allowed */
  333. if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
  334. c->limits[j].max > 1))
  335. return -EINVAL;
  336. cnt += c->limits[j].max;
  337. /*
  338. * Don't advertise an unsupported type
  339. * in a combination.
  340. */
  341. if (WARN_ON((wiphy->interface_modes & types) != types))
  342. return -EINVAL;
  343. }
  344. /* You can't even choose that many! */
  345. if (WARN_ON(cnt < c->max_interfaces))
  346. return -EINVAL;
  347. }
  348. return 0;
  349. }
  350. int wiphy_register(struct wiphy *wiphy)
  351. {
  352. struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  353. int res;
  354. enum ieee80211_band band;
  355. struct ieee80211_supported_band *sband;
  356. bool have_band = false;
  357. int i;
  358. u16 ifmodes = wiphy->interface_modes;
  359. #ifdef CONFIG_PM
  360. if (WARN_ON(wiphy->wowlan &&
  361. (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
  362. !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
  363. return -EINVAL;
  364. if (WARN_ON(wiphy->wowlan &&
  365. !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
  366. !wiphy->wowlan->tcp))
  367. return -EINVAL;
  368. #endif
  369. if (WARN_ON(wiphy->coalesce &&
  370. (!wiphy->coalesce->n_rules ||
  371. !wiphy->coalesce->n_patterns) &&
  372. (!wiphy->coalesce->pattern_min_len ||
  373. wiphy->coalesce->pattern_min_len >
  374. wiphy->coalesce->pattern_max_len)))
  375. return -EINVAL;
  376. if (WARN_ON(wiphy->ap_sme_capa &&
  377. !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
  378. return -EINVAL;
  379. if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
  380. return -EINVAL;
  381. if (WARN_ON(wiphy->addresses &&
  382. !is_zero_ether_addr(wiphy->perm_addr) &&
  383. memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
  384. ETH_ALEN)))
  385. return -EINVAL;
  386. if (WARN_ON(wiphy->max_acl_mac_addrs &&
  387. (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
  388. !rdev->ops->set_mac_acl)))
  389. return -EINVAL;
  390. if (wiphy->addresses)
  391. memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
  392. /* sanity check ifmodes */
  393. WARN_ON(!ifmodes);
  394. ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
  395. if (WARN_ON(ifmodes != wiphy->interface_modes))
  396. wiphy->interface_modes = ifmodes;
  397. res = wiphy_verify_combinations(wiphy);
  398. if (res)
  399. return res;
  400. /* sanity check supported bands/channels */
  401. for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  402. sband = wiphy->bands[band];
  403. if (!sband)
  404. continue;
  405. sband->band = band;
  406. if (WARN_ON(!sband->n_channels))
  407. return -EINVAL;
  408. /*
  409. * on 60gHz band, there are no legacy rates, so
  410. * n_bitrates is 0
  411. */
  412. if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
  413. !sband->n_bitrates))
  414. return -EINVAL;
  415. /*
  416. * Since cfg80211_disable_40mhz_24ghz is global, we can
  417. * modify the sband's ht data even if the driver uses a
  418. * global structure for that.
  419. */
  420. if (cfg80211_disable_40mhz_24ghz &&
  421. band == IEEE80211_BAND_2GHZ &&
  422. sband->ht_cap.ht_supported) {
  423. sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
  424. sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
  425. }
  426. /*
  427. * Since we use a u32 for rate bitmaps in
  428. * ieee80211_get_response_rate, we cannot
  429. * have more than 32 legacy rates.
  430. */
  431. if (WARN_ON(sband->n_bitrates > 32))
  432. return -EINVAL;
  433. for (i = 0; i < sband->n_channels; i++) {
  434. sband->channels[i].orig_flags =
  435. sband->channels[i].flags;
  436. sband->channels[i].orig_mag = INT_MAX;
  437. sband->channels[i].orig_mpwr =
  438. sband->channels[i].max_power;
  439. sband->channels[i].band = band;
  440. }
  441. have_band = true;
  442. }
  443. if (!have_band) {
  444. WARN_ON(1);
  445. return -EINVAL;
  446. }
  447. #ifdef CONFIG_PM
  448. if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
  449. (!rdev->wiphy.wowlan->pattern_min_len ||
  450. rdev->wiphy.wowlan->pattern_min_len >
  451. rdev->wiphy.wowlan->pattern_max_len)))
  452. return -EINVAL;
  453. #endif
  454. /* check and set up bitrates */
  455. ieee80211_set_bitrate_flags(wiphy);
  456. res = device_add(&rdev->wiphy.dev);
  457. if (res)
  458. return res;
  459. res = rfkill_register(rdev->rfkill);
  460. if (res) {
  461. device_del(&rdev->wiphy.dev);
  462. return res;
  463. }
  464. rtnl_lock();
  465. /* set up regulatory info */
  466. wiphy_regulatory_register(wiphy);
  467. list_add_rcu(&rdev->list, &cfg80211_rdev_list);
  468. cfg80211_rdev_list_generation++;
  469. /* add to debugfs */
  470. rdev->wiphy.debugfsdir =
  471. debugfs_create_dir(wiphy_name(&rdev->wiphy),
  472. ieee80211_debugfs_dir);
  473. if (IS_ERR(rdev->wiphy.debugfsdir))
  474. rdev->wiphy.debugfsdir = NULL;
  475. if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
  476. struct regulatory_request request;
  477. request.wiphy_idx = get_wiphy_idx(wiphy);
  478. request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
  479. request.alpha2[0] = '9';
  480. request.alpha2[1] = '9';
  481. nl80211_send_reg_change_event(&request);
  482. }
  483. cfg80211_debugfs_rdev_add(rdev);
  484. rdev->wiphy.registered = true;
  485. rtnl_unlock();
  486. return 0;
  487. }
  488. EXPORT_SYMBOL(wiphy_register);
  489. void wiphy_rfkill_start_polling(struct wiphy *wiphy)
  490. {
  491. struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  492. if (!rdev->ops->rfkill_poll)
  493. return;
  494. rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
  495. rfkill_resume_polling(rdev->rfkill);
  496. }
  497. EXPORT_SYMBOL(wiphy_rfkill_start_polling);
  498. void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
  499. {
  500. struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  501. rfkill_pause_polling(rdev->rfkill);
  502. }
  503. EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
  504. void wiphy_unregister(struct wiphy *wiphy)
  505. {
  506. struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  507. wait_event(rdev->dev_wait, ({
  508. int __count;
  509. rtnl_lock();
  510. __count = rdev->opencount;
  511. rtnl_unlock();
  512. __count == 0; }));
  513. rfkill_unregister(rdev->rfkill);
  514. rtnl_lock();
  515. rdev->wiphy.registered = false;
  516. BUG_ON(!list_empty(&rdev->wdev_list));
  517. /*
  518. * First remove the hardware from everywhere, this makes
  519. * it impossible to find from userspace.
  520. */
  521. debugfs_remove_recursive(rdev->wiphy.debugfsdir);
  522. list_del_rcu(&rdev->list);
  523. synchronize_rcu();
  524. /*
  525. * If this device got a regulatory hint tell core its
  526. * free to listen now to a new shiny device regulatory hint
  527. */
  528. wiphy_regulatory_deregister(wiphy);
  529. cfg80211_rdev_list_generation++;
  530. device_del(&rdev->wiphy.dev);
  531. rtnl_unlock();
  532. flush_work(&rdev->scan_done_wk);
  533. cancel_work_sync(&rdev->conn_work);
  534. flush_work(&rdev->event_work);
  535. cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
  536. #ifdef CONFIG_PM
  537. if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
  538. rdev_set_wakeup(rdev, false);
  539. #endif
  540. cfg80211_rdev_free_wowlan(rdev);
  541. cfg80211_rdev_free_coalesce(rdev);
  542. }
  543. EXPORT_SYMBOL(wiphy_unregister);
  544. void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
  545. {
  546. struct cfg80211_internal_bss *scan, *tmp;
  547. struct cfg80211_beacon_registration *reg, *treg;
  548. rfkill_destroy(rdev->rfkill);
  549. list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
  550. list_del(&reg->list);
  551. kfree(reg);
  552. }
  553. list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
  554. cfg80211_put_bss(&rdev->wiphy, &scan->pub);
  555. kfree(rdev);
  556. }
  557. void wiphy_free(struct wiphy *wiphy)
  558. {
  559. put_device(&wiphy->dev);
  560. }
  561. EXPORT_SYMBOL(wiphy_free);
  562. void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
  563. {
  564. struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  565. if (rfkill_set_hw_state(rdev->rfkill, blocked))
  566. schedule_work(&rdev->rfkill_sync);
  567. }
  568. EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
  569. void cfg80211_unregister_wdev(struct wireless_dev *wdev)
  570. {
  571. struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  572. ASSERT_RTNL();
  573. if (WARN_ON(wdev->netdev))
  574. return;
  575. list_del_rcu(&wdev->list);
  576. rdev->devlist_generation++;
  577. switch (wdev->iftype) {
  578. case NL80211_IFTYPE_P2P_DEVICE:
  579. cfg80211_stop_p2p_device(rdev, wdev);
  580. break;
  581. default:
  582. WARN_ON_ONCE(1);
  583. break;
  584. }
  585. }
  586. EXPORT_SYMBOL(cfg80211_unregister_wdev);
  587. static struct device_type wiphy_type = {
  588. .name = "wlan",
  589. };
  590. void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
  591. enum nl80211_iftype iftype, int num)
  592. {
  593. ASSERT_RTNL();
  594. rdev->num_running_ifaces += num;
  595. if (iftype == NL80211_IFTYPE_MONITOR)
  596. rdev->num_running_monitor_ifaces += num;
  597. }
  598. void cfg80211_leave(struct cfg80211_registered_device *rdev,
  599. struct wireless_dev *wdev)
  600. {
  601. struct net_device *dev = wdev->netdev;
  602. switch (wdev->iftype) {
  603. case NL80211_IFTYPE_ADHOC:
  604. cfg80211_leave_ibss(rdev, dev, true);
  605. break;
  606. case NL80211_IFTYPE_P2P_CLIENT:
  607. case NL80211_IFTYPE_STATION:
  608. __cfg80211_stop_sched_scan(rdev, false);
  609. wdev_lock(wdev);
  610. #ifdef CONFIG_CFG80211_WEXT
  611. kfree(wdev->wext.ie);
  612. wdev->wext.ie = NULL;
  613. wdev->wext.ie_len = 0;
  614. wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
  615. #endif
  616. cfg80211_disconnect(rdev, dev,
  617. WLAN_REASON_DEAUTH_LEAVING, true);
  618. wdev_unlock(wdev);
  619. break;
  620. case NL80211_IFTYPE_MESH_POINT:
  621. cfg80211_leave_mesh(rdev, dev);
  622. break;
  623. case NL80211_IFTYPE_AP:
  624. case NL80211_IFTYPE_P2P_GO:
  625. cfg80211_stop_ap(rdev, dev);
  626. break;
  627. default:
  628. break;
  629. }
  630. wdev->beacon_interval = 0;
  631. }
  632. static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
  633. unsigned long state, void *ptr)
  634. {
  635. struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  636. struct wireless_dev *wdev = dev->ieee80211_ptr;
  637. struct cfg80211_registered_device *rdev;
  638. int ret;
  639. if (!wdev)
  640. return NOTIFY_DONE;
  641. rdev = wiphy_to_dev(wdev->wiphy);
  642. WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
  643. switch (state) {
  644. case NETDEV_POST_INIT:
  645. SET_NETDEV_DEVTYPE(dev, &wiphy_type);
  646. break;
  647. case NETDEV_REGISTER:
  648. /*
  649. * NB: cannot take rdev->mtx here because this may be
  650. * called within code protected by it when interfaces
  651. * are added with nl80211.
  652. */
  653. mutex_init(&wdev->mtx);
  654. INIT_LIST_HEAD(&wdev->event_list);
  655. spin_lock_init(&wdev->event_lock);
  656. INIT_LIST_HEAD(&wdev->mgmt_registrations);
  657. spin_lock_init(&wdev->mgmt_registrations_lock);
  658. wdev->identifier = ++rdev->wdev_id;
  659. list_add_rcu(&wdev->list, &rdev->wdev_list);
  660. rdev->devlist_generation++;
  661. /* can only change netns with wiphy */
  662. dev->features |= NETIF_F_NETNS_LOCAL;
  663. if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
  664. "phy80211")) {
  665. pr_err("failed to add phy80211 symlink to netdev!\n");
  666. }
  667. wdev->netdev = dev;
  668. #ifdef CONFIG_CFG80211_WEXT
  669. wdev->wext.default_key = -1;
  670. wdev->wext.default_mgmt_key = -1;
  671. wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
  672. #endif
  673. if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
  674. wdev->ps = true;
  675. else
  676. wdev->ps = false;
  677. /* allow mac80211 to determine the timeout */
  678. wdev->ps_timeout = -1;
  679. netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
  680. if ((wdev->iftype == NL80211_IFTYPE_STATION ||
  681. wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
  682. wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
  683. dev->priv_flags |= IFF_DONT_BRIDGE;
  684. break;
  685. case NETDEV_GOING_DOWN:
  686. cfg80211_leave(rdev, wdev);
  687. break;
  688. case NETDEV_DOWN:
  689. cfg80211_update_iface_num(rdev, wdev->iftype, -1);
  690. if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
  691. if (WARN_ON(!rdev->scan_req->notified))
  692. rdev->scan_req->aborted = true;
  693. ___cfg80211_scan_done(rdev, true);
  694. }
  695. if (WARN_ON(rdev->sched_scan_req &&
  696. rdev->sched_scan_req->dev == wdev->netdev)) {
  697. __cfg80211_stop_sched_scan(rdev, false);
  698. }
  699. rdev->opencount--;
  700. wake_up(&rdev->dev_wait);
  701. break;
  702. case NETDEV_UP:
  703. cfg80211_update_iface_num(rdev, wdev->iftype, 1);
  704. wdev_lock(wdev);
  705. switch (wdev->iftype) {
  706. #ifdef CONFIG_CFG80211_WEXT
  707. case NL80211_IFTYPE_ADHOC:
  708. cfg80211_ibss_wext_join(rdev, wdev);
  709. break;
  710. case NL80211_IFTYPE_STATION:
  711. cfg80211_mgd_wext_connect(rdev, wdev);
  712. break;
  713. #endif
  714. #ifdef CONFIG_MAC80211_MESH
  715. case NL80211_IFTYPE_MESH_POINT:
  716. {
  717. /* backward compat code... */
  718. struct mesh_setup setup;
  719. memcpy(&setup, &default_mesh_setup,
  720. sizeof(setup));
  721. /* back compat only needed for mesh_id */
  722. setup.mesh_id = wdev->ssid;
  723. setup.mesh_id_len = wdev->mesh_id_up_len;
  724. if (wdev->mesh_id_up_len)
  725. __cfg80211_join_mesh(rdev, dev,
  726. &setup,
  727. &default_mesh_config);
  728. break;
  729. }
  730. #endif
  731. default:
  732. break;
  733. }
  734. wdev_unlock(wdev);
  735. rdev->opencount++;
  736. /*
  737. * Configure power management to the driver here so that its
  738. * correctly set also after interface type changes etc.
  739. */
  740. if ((wdev->iftype == NL80211_IFTYPE_STATION ||
  741. wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
  742. rdev->ops->set_power_mgmt)
  743. if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
  744. wdev->ps_timeout)) {
  745. /* assume this means it's off */
  746. wdev->ps = false;
  747. }
  748. break;
  749. case NETDEV_UNREGISTER:
  750. /*
  751. * It is possible to get NETDEV_UNREGISTER
  752. * multiple times. To detect that, check
  753. * that the interface is still on the list
  754. * of registered interfaces, and only then
  755. * remove and clean it up.
  756. */
  757. if (!list_empty(&wdev->list)) {
  758. sysfs_remove_link(&dev->dev.kobj, "phy80211");
  759. list_del_rcu(&wdev->list);
  760. rdev->devlist_generation++;
  761. cfg80211_mlme_purge_registrations(wdev);
  762. #ifdef CONFIG_CFG80211_WEXT
  763. kfree(wdev->wext.keys);
  764. #endif
  765. }
  766. /*
  767. * synchronise (so that we won't find this netdev
  768. * from other code any more) and then clear the list
  769. * head so that the above code can safely check for
  770. * !list_empty() to avoid double-cleanup.
  771. */
  772. synchronize_rcu();
  773. INIT_LIST_HEAD(&wdev->list);
  774. /*
  775. * Ensure that all events have been processed and
  776. * freed.
  777. */
  778. cfg80211_process_wdev_events(wdev);
  779. if (WARN_ON(wdev->current_bss)) {
  780. cfg80211_unhold_bss(wdev->current_bss);
  781. cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
  782. wdev->current_bss = NULL;
  783. }
  784. break;
  785. case NETDEV_PRE_UP:
  786. if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
  787. return notifier_from_errno(-EOPNOTSUPP);
  788. if (rfkill_blocked(rdev->rfkill))
  789. return notifier_from_errno(-ERFKILL);
  790. ret = cfg80211_can_add_interface(rdev, wdev->iftype);
  791. if (ret)
  792. return notifier_from_errno(ret);
  793. break;
  794. }
  795. return NOTIFY_DONE;
  796. }
  797. static struct notifier_block cfg80211_netdev_notifier = {
  798. .notifier_call = cfg80211_netdev_notifier_call,
  799. };
  800. static void __net_exit cfg80211_pernet_exit(struct net *net)
  801. {
  802. struct cfg80211_registered_device *rdev;
  803. rtnl_lock();
  804. list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  805. if (net_eq(wiphy_net(&rdev->wiphy), net))
  806. WARN_ON(cfg80211_switch_netns(rdev, &init_net));
  807. }
  808. rtnl_unlock();
  809. }
  810. static struct pernet_operations cfg80211_pernet_ops = {
  811. .exit = cfg80211_pernet_exit,
  812. };
  813. static int __init cfg80211_init(void)
  814. {
  815. int err;
  816. err = register_pernet_device(&cfg80211_pernet_ops);
  817. if (err)
  818. goto out_fail_pernet;
  819. err = wiphy_sysfs_init();
  820. if (err)
  821. goto out_fail_sysfs;
  822. err = register_netdevice_notifier(&cfg80211_netdev_notifier);
  823. if (err)
  824. goto out_fail_notifier;
  825. err = nl80211_init();
  826. if (err)
  827. goto out_fail_nl80211;
  828. ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
  829. err = regulatory_init();
  830. if (err)
  831. goto out_fail_reg;
  832. cfg80211_wq = create_singlethread_workqueue("cfg80211");
  833. if (!cfg80211_wq) {
  834. err = -ENOMEM;
  835. goto out_fail_wq;
  836. }
  837. return 0;
  838. out_fail_wq:
  839. regulatory_exit();
  840. out_fail_reg:
  841. debugfs_remove(ieee80211_debugfs_dir);
  842. out_fail_nl80211:
  843. unregister_netdevice_notifier(&cfg80211_netdev_notifier);
  844. out_fail_notifier:
  845. wiphy_sysfs_exit();
  846. out_fail_sysfs:
  847. unregister_pernet_device(&cfg80211_pernet_ops);
  848. out_fail_pernet:
  849. return err;
  850. }
  851. subsys_initcall(cfg80211_init);
  852. static void __exit cfg80211_exit(void)
  853. {
  854. debugfs_remove(ieee80211_debugfs_dir);
  855. nl80211_exit();
  856. unregister_netdevice_notifier(&cfg80211_netdev_notifier);
  857. wiphy_sysfs_exit();
  858. regulatory_exit();
  859. unregister_pernet_device(&cfg80211_pernet_ops);
  860. destroy_workqueue(cfg80211_wq);
  861. }
  862. module_exit(cfg80211_exit);