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 <linux/rtnetlink.h>
  16 #include <net/genetlink.h>
  17 #include <net/cfg80211.h>
  18 #include "nl80211.h"
  19 #include "core.h"
  20 #include "sysfs.h"
  21 #include "debugfs.h"
  22 #include "wext-compat.h"
  23
  24 /* name for sysfs, %d is appended */
  25 #define PHY_NAME "phy"
  26
  27 MODULE_AUTHOR("Johannes Berg");
  28 MODULE_LICENSE("GPL");
  29 MODULE_DESCRIPTION("wireless configuration support");
  30
  31 /* RCU might be appropriate here since we usually
  32  * only read the list, and that can happen quite
  33  * often because we need to do it for each command */
  34 LIST_HEAD(cfg80211_rdev_list);
  35
  36 /*
  37  * This is used to protect the cfg80211_rdev_list, cfg80211_regdomain,
  38  * country_ie_regdomain, the reg_beacon_list and the the last regulatory
  39  * request receipt (last_request).
  40  */
  41 DEFINE_MUTEX(cfg80211_mutex);
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* requires cfg80211_mutex to be held! */
  47 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  48 {
  49         struct cfg80211_registered_device *result = NULL, *rdev;
  50
  51         if (!wiphy_idx_valid(wiphy_idx))
  52                 return NULL;
  53
  54         assert_cfg80211_lock();
  55
  56         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  57                 if (rdev->wiphy_idx == wiphy_idx) {
  58                         result = rdev;
  59                         break;
  60                 }
  61         }
  62
  63         return result;
  64 }
  65
  66 int get_wiphy_idx(struct wiphy *wiphy)
  67 {
  68         struct cfg80211_registered_device *rdev;
  69         if (!wiphy)
  70                 return WIPHY_IDX_STALE;
  71         rdev = wiphy_to_dev(wiphy);
  72         return rdev->wiphy_idx;
  73 }
  74
  75 /* requires cfg80211_rdev_mutex to be held! */
  76 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  77 {
  78         struct cfg80211_registered_device *rdev;
  79
  80         if (!wiphy_idx_valid(wiphy_idx))
  81                 return NULL;
  82
  83         assert_cfg80211_lock();
  84
  85         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  86         if (!rdev)
  87                 return NULL;
  88         return &rdev->wiphy;
  89 }
  90
  91 /* requires cfg80211_mutex to be held! */
  92 struct cfg80211_registered_device *
  93 __cfg80211_rdev_from_info(struct genl_info *info)
  94 {
  95         int ifindex;
  96         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  97         struct net_device *dev;
  98         int err = -EINVAL;
  99
 100         assert_cfg80211_lock();
 101
 102         if (info->attrs[NL80211_ATTR_WIPHY]) {
 103                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 104                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 105                 err = -ENODEV;
 106         }
 107
 108         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 109                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 110                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 111                 if (dev) {
 112                         if (dev->ieee80211_ptr)
 113                                 byifidx =
 114                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 115                         dev_put(dev);
 116                 }
 117                 err = -ENODEV;
 118         }
 119
 120         if (bywiphyidx && byifidx) {
 121                 if (bywiphyidx != byifidx)
 122                         return ERR_PTR(-EINVAL);
 123                 else
 124                         return bywiphyidx; /* == byifidx */
 125         }
 126         if (bywiphyidx)
 127                 return bywiphyidx;
 128
 129         if (byifidx)
 130                 return byifidx;
 131
 132         return ERR_PTR(err);
 133 }
 134
 135 struct cfg80211_registered_device *
 136 cfg80211_get_dev_from_info(struct genl_info *info)
 137 {
 138         struct cfg80211_registered_device *rdev;
 139
 140         mutex_lock(&cfg80211_mutex);
 141         rdev = __cfg80211_rdev_from_info(info);
 142
 143         /* if it is not an error we grab the lock on
 144          * it to assure it won't be going away while
 145          * we operate on it */
 146         if (!IS_ERR(rdev))
 147                 mutex_lock(&rdev->mtx);
 148
 149         mutex_unlock(&cfg80211_mutex);
 150
 151         return rdev;
 152 }
 153
 154 struct cfg80211_registered_device *
 155 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 156 {
 157         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 158         struct net_device *dev;
 159
 160         mutex_lock(&cfg80211_mutex);
 161         dev = dev_get_by_index(net, ifindex);
 162         if (!dev)
 163                 goto out;
 164         if (dev->ieee80211_ptr) {
 165                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 166                 mutex_lock(&rdev->mtx);
 167         } else
 168                 rdev = ERR_PTR(-ENODEV);
 169         dev_put(dev);
 170  out:
 171         mutex_unlock(&cfg80211_mutex);
 172         return rdev;
 173 }
 174
 175 /* requires cfg80211_mutex to be held */
 176 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 177                         char *newname)
 178 {
 179         struct cfg80211_registered_device *rdev2;
 180         int wiphy_idx, taken = -1, result, digits;
 181
 182         assert_cfg80211_lock();
 183
 184         /* prohibit calling the thing phy%d when %d is not its number */
 185         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 186         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 187                 /* count number of places needed to print wiphy_idx */
 188                 digits = 1;
 189                 while (wiphy_idx /= 10)
 190                         digits++;
 191                 /*
 192                  * deny the name if it is phy<idx> where <idx> is printed
 193                  * without leading zeroes. taken == strlen(newname) here
 194                  */
 195                 if (taken == strlen(PHY_NAME) + digits)
 196                         return -EINVAL;
 197         }
 198
 199
 200         /* Ignore nop renames */
 201         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 202                 return 0;
 203
 204         /* Ensure another device does not already have this name. */
 205         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 206                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 207                         return -EINVAL;
 208
 209         result = device_rename(&rdev->wiphy.dev, newname);
 210         if (result)
 211                 return result;
 212
 213         if (rdev->wiphy.debugfsdir &&
 214             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 215                             rdev->wiphy.debugfsdir,
 216                             rdev->wiphy.debugfsdir->d_parent,
 217                             newname))
 218                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 219                        newname);
 220
 221         nl80211_notify_dev_rename(rdev);
 222
 223         return 0;
 224 }
 225
 226 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 227                           struct net *net)
 228 {
 229         struct wireless_dev *wdev;
 230         int err = 0;
 231
 232         if (!rdev->wiphy.netnsok)
 233                 return -EOPNOTSUPP;
 234
 235         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 236                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 237                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 238                 if (err)
 239                         break;
 240                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 241         }
 242
 243         if (err) {
 244                 /* failed -- clean up to old netns */
 245                 net = wiphy_net(&rdev->wiphy);
 246
 247                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 248                                                      list) {
 249                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 250                         err = dev_change_net_namespace(wdev->netdev, net,
 251                                                         "wlan%d");
 252                         WARN_ON(err);
 253                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 254                 }
 255         }
 256
 257         wiphy_net_set(&rdev->wiphy, net);
 258
 259         return err;
 260 }
 261
 262 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 263 {
 264         struct cfg80211_registered_device *rdev = data;
 265
 266         rdev->ops->rfkill_poll(&rdev->wiphy);
 267 }
 268
 269 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 270 {
 271         struct cfg80211_registered_device *rdev = data;
 272         struct wireless_dev *wdev;
 273
 274         if (!blocked)
 275                 return 0;
 276
 277         rtnl_lock();
 278         mutex_lock(&rdev->devlist_mtx);
 279
 280         list_for_each_entry(wdev, &rdev->netdev_list, list)
 281                 dev_close(wdev->netdev);
 282
 283         mutex_unlock(&rdev->devlist_mtx);
 284         rtnl_unlock();
 285
 286         return 0;
 287 }
 288
 289 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 290 {
 291         struct cfg80211_registered_device *rdev;
 292
 293         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 294         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 295 }
 296
 297 static void cfg80211_process_events(struct wireless_dev *wdev)
 298 {
 299         struct cfg80211_event *ev;
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&wdev->event_lock, flags);
 303         while (!list_empty(&wdev->event_list)) {
 304                 ev = list_first_entry(&wdev->event_list,
 305                                       struct cfg80211_event, list);
 306                 list_del(&ev->list);
 307                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 308
 309                 wdev_lock(wdev);
 310                 switch (ev->type) {
 311                 case EVENT_CONNECT_RESULT:
 312                         __cfg80211_connect_result(
 313                                 wdev->netdev, ev->cr.bssid,
 314                                 ev->cr.req_ie, ev->cr.req_ie_len,
 315                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 316                                 ev->cr.status,
 317                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 318                         break;
 319                 case EVENT_ROAMED:
 320                         __cfg80211_roamed(wdev, ev->rm.bssid,
 321                                           ev->rm.req_ie, ev->rm.req_ie_len,
 322                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 323                         break;
 324                 case EVENT_DISCONNECTED:
 325                         __cfg80211_disconnected(wdev->netdev,
 326                                                 ev->dc.ie, ev->dc.ie_len,
 327                                                 ev->dc.reason, true);
 328                         break;
 329                 case EVENT_IBSS_JOINED:
 330                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 331                         break;
 332                 }
 333                 wdev_unlock(wdev);
 334
 335                 kfree(ev);
 336
 337                 spin_lock_irqsave(&wdev->event_lock, flags);
 338         }
 339         spin_unlock_irqrestore(&wdev->event_lock, flags);
 340 }
 341
 342 static void cfg80211_event_work(struct work_struct *work)
 343 {
 344         struct cfg80211_registered_device *rdev;
 345         struct wireless_dev *wdev;
 346
 347         rdev = container_of(work, struct cfg80211_registered_device,
 348                             event_work);
 349
 350         rtnl_lock();
 351         cfg80211_lock_rdev(rdev);
 352         mutex_lock(&rdev->devlist_mtx);
 353
 354         list_for_each_entry(wdev, &rdev->netdev_list, list)
 355                 cfg80211_process_events(wdev);
 356
 357         mutex_unlock(&rdev->devlist_mtx);
 358         cfg80211_unlock_rdev(rdev);
 359         rtnl_unlock();
 360 }
 361
 362 /* exported functions */
 363
 364 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 365 {
 366         static int wiphy_counter;
 367
 368         struct cfg80211_registered_device *rdev;
 369         int alloc_size;
 370
 371         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 372         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 373         WARN_ON(ops->connect && !ops->disconnect);
 374         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 375         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 376         WARN_ON(ops->add_station && !ops->del_station);
 377         WARN_ON(ops->add_mpath && !ops->del_mpath);
 378
 379         alloc_size = sizeof(*rdev) + sizeof_priv;
 380
 381         rdev = kzalloc(alloc_size, GFP_KERNEL);
 382         if (!rdev)
 383                 return NULL;
 384
 385         rdev->ops = ops;
 386
 387         mutex_lock(&cfg80211_mutex);
 388
 389         rdev->wiphy_idx = wiphy_counter++;
 390
 391         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 392                 wiphy_counter--;
 393                 mutex_unlock(&cfg80211_mutex);
 394                 /* ugh, wrapped! */
 395                 kfree(rdev);
 396                 return NULL;
 397         }
 398
 399         mutex_unlock(&cfg80211_mutex);
 400
 401         /* give it a proper name */
 402         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 403
 404         mutex_init(&rdev->mtx);
 405         mutex_init(&rdev->devlist_mtx);
 406         INIT_LIST_HEAD(&rdev->netdev_list);
 407         spin_lock_init(&rdev->bss_lock);
 408         INIT_LIST_HEAD(&rdev->bss_list);
 409         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 410
 411         device_initialize(&rdev->wiphy.dev);
 412         rdev->wiphy.dev.class = &ieee80211_class;
 413         rdev->wiphy.dev.platform_data = rdev;
 414
 415         wiphy_net_set(&rdev->wiphy, &init_net);
 416
 417         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 418         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 419                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 420                                    &rdev->rfkill_ops, rdev);
 421
 422         if (!rdev->rfkill) {
 423                 kfree(rdev);
 424                 return NULL;
 425         }
 426
 427         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 428         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 429         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 430
 431         /*
 432          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 433          * Fragmentation and RTS threshold are disabled by default with the
 434          * special -1 value.
 435          */
 436         rdev->wiphy.retry_short = 7;
 437         rdev->wiphy.retry_long = 4;
 438         rdev->wiphy.frag_threshold = (u32) -1;
 439         rdev->wiphy.rts_threshold = (u32) -1;
 440
 441         return &rdev->wiphy;
 442 }
 443 EXPORT_SYMBOL(wiphy_new);
 444
 445 int wiphy_register(struct wiphy *wiphy)
 446 {
 447         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 448         int res;
 449         enum ieee80211_band band;
 450         struct ieee80211_supported_band *sband;
 451         bool have_band = false;
 452         int i;
 453         u16 ifmodes = wiphy->interface_modes;
 454
 455         /* sanity check ifmodes */
 456         WARN_ON(!ifmodes);
 457         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 458         if (WARN_ON(ifmodes != wiphy->interface_modes))
 459                 wiphy->interface_modes = ifmodes;
 460
 461         /* sanity check supported bands/channels */
 462         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 463                 sband = wiphy->bands[band];
 464                 if (!sband)
 465                         continue;
 466
 467                 sband->band = band;
 468
 469                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 470                         return -EINVAL;
 471
 472                 /*
 473                  * Since we use a u32 for rate bitmaps in
 474                  * ieee80211_get_response_rate, we cannot
 475                  * have more than 32 legacy rates.
 476                  */
 477                 if (WARN_ON(sband->n_bitrates > 32))
 478                         return -EINVAL;
 479
 480                 for (i = 0; i < sband->n_channels; i++) {
 481                         sband->channels[i].orig_flags =
 482                                 sband->channels[i].flags;
 483                         sband->channels[i].orig_mag =
 484                                 sband->channels[i].max_antenna_gain;
 485                         sband->channels[i].orig_mpwr =
 486                                 sband->channels[i].max_power;
 487                         sband->channels[i].band = band;
 488                 }
 489
 490                 have_band = true;
 491         }
 492
 493         if (!have_band) {
 494                 WARN_ON(1);
 495                 return -EINVAL;
 496         }
 497
 498         /* check and set up bitrates */
 499         ieee80211_set_bitrate_flags(wiphy);
 500
 501         res = device_add(&rdev->wiphy.dev);
 502         if (res)
 503                 return res;
 504
 505         res = rfkill_register(rdev->rfkill);
 506         if (res)
 507                 goto out_rm_dev;
 508
 509         mutex_lock(&cfg80211_mutex);
 510
 511         /* set up regulatory info */
 512         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 513
 514         list_add(&rdev->list, &cfg80211_rdev_list);
 515
 516         mutex_unlock(&cfg80211_mutex);
 517
 518         /* add to debugfs */
 519         rdev->wiphy.debugfsdir =
 520                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 521                                    ieee80211_debugfs_dir);
 522         if (IS_ERR(rdev->wiphy.debugfsdir))
 523                 rdev->wiphy.debugfsdir = NULL;
 524
 525         if (wiphy->custom_regulatory) {
 526                 struct regulatory_request request;
 527
 528                 request.wiphy_idx = get_wiphy_idx(wiphy);
 529                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 530                 request.alpha2[0] = '9';
 531                 request.alpha2[1] = '9';
 532
 533                 nl80211_send_reg_change_event(&request);
 534         }
 535
 536         cfg80211_debugfs_rdev_add(rdev);
 537
 538         return 0;
 539
 540  out_rm_dev:
 541         device_del(&rdev->wiphy.dev);
 542         return res;
 543 }
 544 EXPORT_SYMBOL(wiphy_register);
 545
 546 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 547 {
 548         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 549
 550         if (!rdev->ops->rfkill_poll)
 551                 return;
 552         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 553         rfkill_resume_polling(rdev->rfkill);
 554 }
 555 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 556
 557 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 558 {
 559         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 560
 561         rfkill_pause_polling(rdev->rfkill);
 562 }
 563 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 564
 565 void wiphy_unregister(struct wiphy *wiphy)
 566 {
 567         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 568
 569         rfkill_unregister(rdev->rfkill);
 570
 571         /* protect the device list */
 572         mutex_lock(&cfg80211_mutex);
 573
 574         BUG_ON(!list_empty(&rdev->netdev_list));
 575
 576         /*
 577          * Try to grab rdev->mtx. If a command is still in progress,
 578          * hopefully the driver will refuse it since it's tearing
 579          * down the device already. We wait for this command to complete
 580          * before unlinking the item from the list.
 581          * Note: as codified by the BUG_ON above we cannot get here if
 582          * a virtual interface is still associated. Hence, we can only
 583          * get to lock contention here if userspace issues a command
 584          * that identified the hardware by wiphy index.
 585          */
 586         mutex_lock(&rdev->mtx);
 587         /* unlock again before freeing */
 588         mutex_unlock(&rdev->mtx);
 589
 590         cfg80211_debugfs_rdev_del(rdev);
 591
 592         /* If this device got a regulatory hint tell core its
 593          * free to listen now to a new shiny device regulatory hint */
 594         reg_device_remove(wiphy);
 595
 596         list_del(&rdev->list);
 597         device_del(&rdev->wiphy.dev);
 598         debugfs_remove(rdev->wiphy.debugfsdir);
 599
 600         mutex_unlock(&cfg80211_mutex);
 601
 602         cancel_work_sync(&rdev->conn_work);
 603         cancel_work_sync(&rdev->scan_done_wk);
 604         kfree(rdev->scan_req);
 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 int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 636                                          unsigned long state,
 637                                          void *ndev)
 638 {
 639         struct net_device *dev = ndev;
 640         struct wireless_dev *wdev = dev->ieee80211_ptr;
 641         struct cfg80211_registered_device *rdev;
 642
 643         if (!wdev)
 644                 return NOTIFY_DONE;
 645
 646         rdev = wiphy_to_dev(wdev->wiphy);
 647
 648         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 649
 650         switch (state) {
 651         case NETDEV_REGISTER:
 652                 mutex_init(&wdev->mtx);
 653                 INIT_LIST_HEAD(&wdev->event_list);
 654                 spin_lock_init(&wdev->event_lock);
 655                 mutex_lock(&rdev->devlist_mtx);
 656                 list_add(&wdev->list, &rdev->netdev_list);
 657                 /* can only change netns with wiphy */
 658                 dev->features |= NETIF_F_NETNS_LOCAL;
 659
 660                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 661                                       "phy80211")) {
 662                         printk(KERN_ERR "wireless: failed to add phy80211 "
 663                                 "symlink to netdev!\n");
 664                 }
 665                 wdev->netdev = dev;
 666                 wdev->sme_state = CFG80211_SME_IDLE;
 667                 mutex_unlock(&rdev->devlist_mtx);
 668 #ifdef CONFIG_WIRELESS_EXT
 669                 if (!dev->wireless_handlers)
 670                         dev->wireless_handlers = &cfg80211_wext_handler;
 671                 wdev->wext.default_key = -1;
 672                 wdev->wext.default_mgmt_key = -1;
 673                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 674                 wdev->wext.ps = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 675                 wdev->wext.ps_timeout = 500;
 676                 if (rdev->ops->set_power_mgmt)
 677                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 678                                                       wdev->wext.ps,
 679                                                       wdev->wext.ps_timeout)) {
 680                                 /* assume this means it's off */
 681                                 wdev->wext.ps = false;
 682                         }
 683 #endif
 684                 break;
 685         case NETDEV_GOING_DOWN:
 686                 switch (wdev->iftype) {
 687                 case NL80211_IFTYPE_ADHOC:
 688                         cfg80211_leave_ibss(rdev, dev, true);
 689                         break;
 690                 case NL80211_IFTYPE_STATION:
 691                         wdev_lock(wdev);
 692 #ifdef CONFIG_WIRELESS_EXT
 693                         kfree(wdev->wext.ie);
 694                         wdev->wext.ie = NULL;
 695                         wdev->wext.ie_len = 0;
 696                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 697 #endif
 698                         __cfg80211_disconnect(rdev, dev,
 699                                               WLAN_REASON_DEAUTH_LEAVING, true);
 700                         cfg80211_mlme_down(rdev, dev);
 701                         wdev_unlock(wdev);
 702                         break;
 703                 default:
 704                         break;
 705                 }
 706                 break;
 707         case NETDEV_UP:
 708 #ifdef CONFIG_WIRELESS_EXT
 709                 cfg80211_lock_rdev(rdev);
 710                 wdev_lock(wdev);
 711                 switch (wdev->iftype) {
 712                 case NL80211_IFTYPE_ADHOC:
 713                         cfg80211_ibss_wext_join(rdev, wdev);
 714                         break;
 715                 case NL80211_IFTYPE_STATION:
 716                         cfg80211_mgd_wext_connect(rdev, wdev);
 717                         break;
 718                 default:
 719                         break;
 720                 }
 721                 wdev_unlock(wdev);
 722                 cfg80211_unlock_rdev(rdev);
 723 #endif
 724                 break;
 725         case NETDEV_UNREGISTER:
 726                 mutex_lock(&rdev->devlist_mtx);
 727                 if (!list_empty(&wdev->list)) {
 728                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 729                         list_del_init(&wdev->list);
 730                 }
 731                 mutex_unlock(&rdev->devlist_mtx);
 732                 mutex_destroy(&wdev->mtx);
 733 #ifdef CONFIG_WIRELESS_EXT
 734                 kfree(wdev->wext.keys);
 735 #endif
 736                 break;
 737         case NETDEV_PRE_UP:
 738                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 739                         return notifier_from_errno(-EOPNOTSUPP);
 740                 if (rfkill_blocked(rdev->rfkill))
 741                         return notifier_from_errno(-ERFKILL);
 742                 break;
 743         }
 744
 745         return NOTIFY_DONE;
 746 }
 747
 748 static struct notifier_block cfg80211_netdev_notifier = {
 749         .notifier_call = cfg80211_netdev_notifier_call,
 750 };
 751
 752 static void __net_exit cfg80211_pernet_exit(struct net *net)
 753 {
 754         struct cfg80211_registered_device *rdev;
 755
 756         rtnl_lock();
 757         mutex_lock(&cfg80211_mutex);
 758         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 759                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 760                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 761         }
 762         mutex_unlock(&cfg80211_mutex);
 763         rtnl_unlock();
 764 }
 765
 766 static struct pernet_operations cfg80211_pernet_ops = {
 767         .exit = cfg80211_pernet_exit,
 768 };
 769
 770 static int __init cfg80211_init(void)
 771 {
 772         int err;
 773
 774         err = register_pernet_device(&cfg80211_pernet_ops);
 775         if (err)
 776                 goto out_fail_pernet;
 777
 778         err = wiphy_sysfs_init();
 779         if (err)
 780                 goto out_fail_sysfs;
 781
 782         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 783         if (err)
 784                 goto out_fail_notifier;
 785
 786         err = nl80211_init();
 787         if (err)
 788                 goto out_fail_nl80211;
 789
 790         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 791
 792         err = regulatory_init();
 793         if (err)
 794                 goto out_fail_reg;
 795
 796         return 0;
 797
 798 out_fail_reg:
 799         debugfs_remove(ieee80211_debugfs_dir);
 800 out_fail_nl80211:
 801         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 802 out_fail_notifier:
 803         wiphy_sysfs_exit();
 804 out_fail_sysfs:
 805         unregister_pernet_device(&cfg80211_pernet_ops);
 806 out_fail_pernet:
 807         return err;
 808 }
 809 subsys_initcall(cfg80211_init);
 810
 811 static void cfg80211_exit(void)
 812 {
 813         debugfs_remove(ieee80211_debugfs_dir);
 814         nl80211_exit();
 815         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 816         wiphy_sysfs_exit();
 817         regulatory_exit();
 818         unregister_pernet_device(&cfg80211_pernet_ops);
 819 }
 820 module_exit(cfg80211_exit);