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/etherdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/sched.h>
  18 #include <net/genetlink.h>
  19 #include <net/cfg80211.h>
  20 #include "nl80211.h"
  21 #include "core.h"
  22 #include "sysfs.h"
  23 #include "debugfs.h"
  24 #include "wext-compat.h"
  25 #include "ethtool.h"
  26
  27 /* name for sysfs, %d is appended */
  28 #define PHY_NAME "phy"
  29
  30 MODULE_AUTHOR("Johannes Berg");
  31 MODULE_LICENSE("GPL");
  32 MODULE_DESCRIPTION("wireless configuration support");
  33
  34 /* RCU might be appropriate here since we usually
  35  * only read the list, and that can happen quite
  36  * often because we need to do it for each command */
  37 LIST_HEAD(cfg80211_rdev_list);
  38 int cfg80211_rdev_list_generation;
  39
  40 /*
  41  * This is used to protect the cfg80211_rdev_list
  42  */
  43 DEFINE_MUTEX(cfg80211_mutex);
  44
  45 /* for debugfs */
  46 static struct dentry *ieee80211_debugfs_dir;
  47
  48 /* for the cleanup, scan and event works */
  49 struct workqueue_struct *cfg80211_wq;
  50
  51 /* requires cfg80211_mutex to be held! */
  52 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  53 {
  54         struct cfg80211_registered_device *result = NULL, *rdev;
  55
  56         if (!wiphy_idx_valid(wiphy_idx))
  57                 return NULL;
  58
  59         assert_cfg80211_lock();
  60
  61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  62                 if (rdev->wiphy_idx == wiphy_idx) {
  63                         result = rdev;
  64                         break;
  65                 }
  66         }
  67
  68         return result;
  69 }
  70
  71 int get_wiphy_idx(struct wiphy *wiphy)
  72 {
  73         struct cfg80211_registered_device *rdev;
  74         if (!wiphy)
  75                 return WIPHY_IDX_STALE;
  76         rdev = wiphy_to_dev(wiphy);
  77         return rdev->wiphy_idx;
  78 }
  79
  80 /* requires cfg80211_rdev_mutex to be held! */
  81 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  82 {
  83         struct cfg80211_registered_device *rdev;
  84
  85         if (!wiphy_idx_valid(wiphy_idx))
  86                 return NULL;
  87
  88         assert_cfg80211_lock();
  89
  90         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  91         if (!rdev)
  92                 return NULL;
  93         return &rdev->wiphy;
  94 }
  95
  96 /* requires cfg80211_mutex to be held! */
  97 struct cfg80211_registered_device *
  98 __cfg80211_rdev_from_info(struct genl_info *info)
  99 {
 100         int ifindex;
 101         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
 102         struct net_device *dev;
 103         int err = -EINVAL;
 104
 105         assert_cfg80211_lock();
 106
 107         if (info->attrs[NL80211_ATTR_WIPHY]) {
 108                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 109                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 110                 err = -ENODEV;
 111         }
 112
 113         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 114                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 115                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 116                 if (dev) {
 117                         if (dev->ieee80211_ptr)
 118                                 byifidx =
 119                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 120                         dev_put(dev);
 121                 }
 122                 err = -ENODEV;
 123         }
 124
 125         if (bywiphyidx && byifidx) {
 126                 if (bywiphyidx != byifidx)
 127                         return ERR_PTR(-EINVAL);
 128                 else
 129                         return bywiphyidx; /* == byifidx */
 130         }
 131         if (bywiphyidx)
 132                 return bywiphyidx;
 133
 134         if (byifidx)
 135                 return byifidx;
 136
 137         return ERR_PTR(err);
 138 }
 139
 140 struct cfg80211_registered_device *
 141 cfg80211_get_dev_from_info(struct genl_info *info)
 142 {
 143         struct cfg80211_registered_device *rdev;
 144
 145         mutex_lock(&cfg80211_mutex);
 146         rdev = __cfg80211_rdev_from_info(info);
 147
 148         /* if it is not an error we grab the lock on
 149          * it to assure it won't be going away while
 150          * we operate on it */
 151         if (!IS_ERR(rdev))
 152                 mutex_lock(&rdev->mtx);
 153
 154         mutex_unlock(&cfg80211_mutex);
 155
 156         return rdev;
 157 }
 158
 159 struct cfg80211_registered_device *
 160 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 161 {
 162         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 163         struct net_device *dev;
 164
 165         mutex_lock(&cfg80211_mutex);
 166         dev = dev_get_by_index(net, ifindex);
 167         if (!dev)
 168                 goto out;
 169         if (dev->ieee80211_ptr) {
 170                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 171                 mutex_lock(&rdev->mtx);
 172         } else
 173                 rdev = ERR_PTR(-ENODEV);
 174         dev_put(dev);
 175  out:
 176         mutex_unlock(&cfg80211_mutex);
 177         return rdev;
 178 }
 179
 180 /* requires cfg80211_mutex to be held */
 181 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 182                         char *newname)
 183 {
 184         struct cfg80211_registered_device *rdev2;
 185         int wiphy_idx, taken = -1, result, digits;
 186
 187         assert_cfg80211_lock();
 188
 189         /* prohibit calling the thing phy%d when %d is not its number */
 190         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 191         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 192                 /* count number of places needed to print wiphy_idx */
 193                 digits = 1;
 194                 while (wiphy_idx /= 10)
 195                         digits++;
 196                 /*
 197                  * deny the name if it is phy<idx> where <idx> is printed
 198                  * without leading zeroes. taken == strlen(newname) here
 199                  */
 200                 if (taken == strlen(PHY_NAME) + digits)
 201                         return -EINVAL;
 202         }
 203
 204
 205         /* Ignore nop renames */
 206         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 207                 return 0;
 208
 209         /* Ensure another device does not already have this name. */
 210         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 211                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 212                         return -EINVAL;
 213
 214         result = device_rename(&rdev->wiphy.dev, newname);
 215         if (result)
 216                 return result;
 217
 218         if (rdev->wiphy.debugfsdir &&
 219             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 220                             rdev->wiphy.debugfsdir,
 221                             rdev->wiphy.debugfsdir->d_parent,
 222                             newname))
 223                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 224                        newname);
 225
 226         nl80211_notify_dev_rename(rdev);
 227
 228         return 0;
 229 }
 230
 231 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 232                           struct net *net)
 233 {
 234         struct wireless_dev *wdev;
 235         int err = 0;
 236
 237         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 238                 return -EOPNOTSUPP;
 239
 240         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 241                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 242                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 243                 if (err)
 244                         break;
 245                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 246         }
 247
 248         if (err) {
 249                 /* failed -- clean up to old netns */
 250                 net = wiphy_net(&rdev->wiphy);
 251
 252                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 253                                                      list) {
 254                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 255                         err = dev_change_net_namespace(wdev->netdev, net,
 256                                                         "wlan%d");
 257                         WARN_ON(err);
 258                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 259                 }
 260         }
 261
 262         wiphy_net_set(&rdev->wiphy, net);
 263
 264         return err;
 265 }
 266
 267 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 268 {
 269         struct cfg80211_registered_device *rdev = data;
 270
 271         rdev->ops->rfkill_poll(&rdev->wiphy);
 272 }
 273
 274 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 275 {
 276         struct cfg80211_registered_device *rdev = data;
 277         struct wireless_dev *wdev;
 278
 279         if (!blocked)
 280                 return 0;
 281
 282         rtnl_lock();
 283         mutex_lock(&rdev->devlist_mtx);
 284
 285         list_for_each_entry(wdev, &rdev->netdev_list, list)
 286                 dev_close(wdev->netdev);
 287
 288         mutex_unlock(&rdev->devlist_mtx);
 289         rtnl_unlock();
 290
 291         return 0;
 292 }
 293
 294 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 295 {
 296         struct cfg80211_registered_device *rdev;
 297
 298         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 299         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 300 }
 301
 302 static void cfg80211_event_work(struct work_struct *work)
 303 {
 304         struct cfg80211_registered_device *rdev;
 305
 306         rdev = container_of(work, struct cfg80211_registered_device,
 307                             event_work);
 308
 309         rtnl_lock();
 310         cfg80211_lock_rdev(rdev);
 311
 312         cfg80211_process_rdev_events(rdev);
 313         cfg80211_unlock_rdev(rdev);
 314         rtnl_unlock();
 315 }
 316
 317 /* exported functions */
 318
 319 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 320 {
 321         static int wiphy_counter;
 322
 323         struct cfg80211_registered_device *rdev;
 324         int alloc_size;
 325
 326         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 327         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 328         WARN_ON(ops->connect && !ops->disconnect);
 329         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 330         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 331         WARN_ON(ops->add_station && !ops->del_station);
 332         WARN_ON(ops->add_mpath && !ops->del_mpath);
 333
 334         alloc_size = sizeof(*rdev) + sizeof_priv;
 335
 336         rdev = kzalloc(alloc_size, GFP_KERNEL);
 337         if (!rdev)
 338                 return NULL;
 339
 340         rdev->ops = ops;
 341
 342         mutex_lock(&cfg80211_mutex);
 343
 344         rdev->wiphy_idx = wiphy_counter++;
 345
 346         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 347                 wiphy_counter--;
 348                 mutex_unlock(&cfg80211_mutex);
 349                 /* ugh, wrapped! */
 350                 kfree(rdev);
 351                 return NULL;
 352         }
 353
 354         mutex_unlock(&cfg80211_mutex);
 355
 356         /* give it a proper name */
 357         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 358
 359         mutex_init(&rdev->mtx);
 360         mutex_init(&rdev->devlist_mtx);
 361         INIT_LIST_HEAD(&rdev->netdev_list);
 362         spin_lock_init(&rdev->bss_lock);
 363         INIT_LIST_HEAD(&rdev->bss_list);
 364         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 365
 366 #ifdef CONFIG_CFG80211_WEXT
 367         rdev->wiphy.wext = &cfg80211_wext_handler;
 368 #endif
 369
 370         device_initialize(&rdev->wiphy.dev);
 371         rdev->wiphy.dev.class = &ieee80211_class;
 372         rdev->wiphy.dev.platform_data = rdev;
 373
 374 #ifdef CONFIG_CFG80211_DEFAULT_PS
 375         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 376 #endif
 377
 378         wiphy_net_set(&rdev->wiphy, &init_net);
 379
 380         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 381         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 382                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 383                                    &rdev->rfkill_ops, rdev);
 384
 385         if (!rdev->rfkill) {
 386                 kfree(rdev);
 387                 return NULL;
 388         }
 389
 390         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 391         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 392         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 393
 394         init_waitqueue_head(&rdev->dev_wait);
 395
 396         /*
 397          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 398          * Fragmentation and RTS threshold are disabled by default with the
 399          * special -1 value.
 400          */
 401         rdev->wiphy.retry_short = 7;
 402         rdev->wiphy.retry_long = 4;
 403         rdev->wiphy.frag_threshold = (u32) -1;
 404         rdev->wiphy.rts_threshold = (u32) -1;
 405
 406         return &rdev->wiphy;
 407 }
 408 EXPORT_SYMBOL(wiphy_new);
 409
 410 int wiphy_register(struct wiphy *wiphy)
 411 {
 412         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 413         int res;
 414         enum ieee80211_band band;
 415         struct ieee80211_supported_band *sband;
 416         bool have_band = false;
 417         int i;
 418         u16 ifmodes = wiphy->interface_modes;
 419
 420         /* sanity check ifmodes */
 421         WARN_ON(!ifmodes);
 422         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 423         if (WARN_ON(ifmodes != wiphy->interface_modes))
 424                 wiphy->interface_modes = ifmodes;
 425
 426         /* sanity check supported bands/channels */
 427         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 428                 sband = wiphy->bands[band];
 429                 if (!sband)
 430                         continue;
 431
 432                 sband->band = band;
 433
 434                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 435                         return -EINVAL;
 436
 437                 /*
 438                  * Since we use a u32 for rate bitmaps in
 439                  * ieee80211_get_response_rate, we cannot
 440                  * have more than 32 legacy rates.
 441                  */
 442                 if (WARN_ON(sband->n_bitrates > 32))
 443                         return -EINVAL;
 444
 445                 for (i = 0; i < sband->n_channels; i++) {
 446                         sband->channels[i].orig_flags =
 447                                 sband->channels[i].flags;
 448                         sband->channels[i].orig_mag =
 449                                 sband->channels[i].max_antenna_gain;
 450                         sband->channels[i].orig_mpwr =
 451                                 sband->channels[i].max_power;
 452                         sband->channels[i].band = band;
 453                 }
 454
 455                 have_band = true;
 456         }
 457
 458         if (!have_band) {
 459                 WARN_ON(1);
 460                 return -EINVAL;
 461         }
 462
 463         /* check and set up bitrates */
 464         ieee80211_set_bitrate_flags(wiphy);
 465
 466         res = device_add(&rdev->wiphy.dev);
 467         if (res)
 468                 return res;
 469
 470         res = rfkill_register(rdev->rfkill);
 471         if (res)
 472                 goto out_rm_dev;
 473
 474         mutex_lock(&cfg80211_mutex);
 475
 476         /* set up regulatory info */
 477         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 478
 479         list_add(&rdev->list, &cfg80211_rdev_list);
 480         cfg80211_rdev_list_generation++;
 481
 482         mutex_unlock(&cfg80211_mutex);
 483
 484         /* add to debugfs */
 485         rdev->wiphy.debugfsdir =
 486                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 487                                    ieee80211_debugfs_dir);
 488         if (IS_ERR(rdev->wiphy.debugfsdir))
 489                 rdev->wiphy.debugfsdir = NULL;
 490
 491         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 492                 struct regulatory_request request;
 493
 494                 request.wiphy_idx = get_wiphy_idx(wiphy);
 495                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 496                 request.alpha2[0] = '9';
 497                 request.alpha2[1] = '9';
 498
 499                 nl80211_send_reg_change_event(&request);
 500         }
 501
 502         cfg80211_debugfs_rdev_add(rdev);
 503
 504         return 0;
 505
 506  out_rm_dev:
 507         device_del(&rdev->wiphy.dev);
 508         return res;
 509 }
 510 EXPORT_SYMBOL(wiphy_register);
 511
 512 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 513 {
 514         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 515
 516         if (!rdev->ops->rfkill_poll)
 517                 return;
 518         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 519         rfkill_resume_polling(rdev->rfkill);
 520 }
 521 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 522
 523 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 524 {
 525         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 526
 527         rfkill_pause_polling(rdev->rfkill);
 528 }
 529 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 530
 531 void wiphy_unregister(struct wiphy *wiphy)
 532 {
 533         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 534
 535         rfkill_unregister(rdev->rfkill);
 536
 537         /* protect the device list */
 538         mutex_lock(&cfg80211_mutex);
 539
 540         wait_event(rdev->dev_wait, ({
 541                 int __count;
 542                 mutex_lock(&rdev->devlist_mtx);
 543                 __count = rdev->opencount;
 544                 mutex_unlock(&rdev->devlist_mtx);
 545                 __count == 0;}));
 546
 547         mutex_lock(&rdev->devlist_mtx);
 548         BUG_ON(!list_empty(&rdev->netdev_list));
 549         mutex_unlock(&rdev->devlist_mtx);
 550
 551         /*
 552          * First remove the hardware from everywhere, this makes
 553          * it impossible to find from userspace.
 554          */
 555         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 556         list_del(&rdev->list);
 557
 558         /*
 559          * Try to grab rdev->mtx. If a command is still in progress,
 560          * hopefully the driver will refuse it since it's tearing
 561          * down the device already. We wait for this command to complete
 562          * before unlinking the item from the list.
 563          * Note: as codified by the BUG_ON above we cannot get here if
 564          * a virtual interface is still present. Hence, we can only get
 565          * to lock contention here if userspace issues a command that
 566          * identified the hardware by wiphy index.
 567          */
 568         cfg80211_lock_rdev(rdev);
 569         /* nothing */
 570         cfg80211_unlock_rdev(rdev);
 571
 572         /* If this device got a regulatory hint tell core its
 573          * free to listen now to a new shiny device regulatory hint */
 574         reg_device_remove(wiphy);
 575
 576         cfg80211_rdev_list_generation++;
 577         device_del(&rdev->wiphy.dev);
 578
 579         mutex_unlock(&cfg80211_mutex);
 580
 581         flush_work(&rdev->scan_done_wk);
 582         cancel_work_sync(&rdev->conn_work);
 583         flush_work(&rdev->event_work);
 584 }
 585 EXPORT_SYMBOL(wiphy_unregister);
 586
 587 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 588 {
 589         struct cfg80211_internal_bss *scan, *tmp;
 590         rfkill_destroy(rdev->rfkill);
 591         mutex_destroy(&rdev->mtx);
 592         mutex_destroy(&rdev->devlist_mtx);
 593         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 594                 cfg80211_put_bss(&scan->pub);
 595         kfree(rdev);
 596 }
 597
 598 void wiphy_free(struct wiphy *wiphy)
 599 {
 600         put_device(&wiphy->dev);
 601 }
 602 EXPORT_SYMBOL(wiphy_free);
 603
 604 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 605 {
 606         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 607
 608         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 609                 schedule_work(&rdev->rfkill_sync);
 610 }
 611 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 612
 613 static void wdev_cleanup_work(struct work_struct *work)
 614 {
 615         struct wireless_dev *wdev;
 616         struct cfg80211_registered_device *rdev;
 617
 618         wdev = container_of(work, struct wireless_dev, cleanup_work);
 619         rdev = wiphy_to_dev(wdev->wiphy);
 620
 621         cfg80211_lock_rdev(rdev);
 622
 623         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 624                 rdev->scan_req->aborted = true;
 625                 ___cfg80211_scan_done(rdev, true);
 626         }
 627
 628         cfg80211_unlock_rdev(rdev);
 629
 630         mutex_lock(&rdev->devlist_mtx);
 631         rdev->opencount--;
 632         mutex_unlock(&rdev->devlist_mtx);
 633         wake_up(&rdev->dev_wait);
 634
 635         dev_put(wdev->netdev);
 636 }
 637
 638 static struct device_type wiphy_type = {
 639         .name   = "wlan",
 640 };
 641
 642 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 643                                          unsigned long state,
 644                                          void *ndev)
 645 {
 646         struct net_device *dev = ndev;
 647         struct wireless_dev *wdev = dev->ieee80211_ptr;
 648         struct cfg80211_registered_device *rdev;
 649
 650         if (!wdev)
 651                 return NOTIFY_DONE;
 652
 653         rdev = wiphy_to_dev(wdev->wiphy);
 654
 655         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 656
 657         switch (state) {
 658         case NETDEV_POST_INIT:
 659                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 660                 break;
 661         case NETDEV_REGISTER:
 662                 /*
 663                  * NB: cannot take rdev->mtx here because this may be
 664                  * called within code protected by it when interfaces
 665                  * are added with nl80211.
 666                  */
 667                 mutex_init(&wdev->mtx);
 668                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 669                 INIT_LIST_HEAD(&wdev->event_list);
 670                 spin_lock_init(&wdev->event_lock);
 671                 mutex_lock(&rdev->devlist_mtx);
 672                 list_add(&wdev->list, &rdev->netdev_list);
 673                 rdev->devlist_generation++;
 674                 /* can only change netns with wiphy */
 675                 dev->features |= NETIF_F_NETNS_LOCAL;
 676
 677                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 678                                       "phy80211")) {
 679                         printk(KERN_ERR "wireless: failed to add phy80211 "
 680                                 "symlink to netdev!\n");
 681                 }
 682                 wdev->netdev = dev;
 683                 wdev->sme_state = CFG80211_SME_IDLE;
 684                 mutex_unlock(&rdev->devlist_mtx);
 685 #ifdef CONFIG_CFG80211_WEXT
 686                 wdev->wext.default_key = -1;
 687                 wdev->wext.default_mgmt_key = -1;
 688                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 689                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 690                         wdev->wext.ps = true;
 691                 else
 692                         wdev->wext.ps = false;
 693                 wdev->wext.ps_timeout = 100;
 694                 if (rdev->ops->set_power_mgmt)
 695                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 696                                                       wdev->wext.ps,
 697                                                       wdev->wext.ps_timeout)) {
 698                                 /* assume this means it's off */
 699                                 wdev->wext.ps = false;
 700                         }
 701 #endif
 702                 if (!dev->ethtool_ops)
 703                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 704
 705                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 706                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 707                         dev->priv_flags |= IFF_DONT_BRIDGE;
 708                 break;
 709         case NETDEV_GOING_DOWN:
 710                 switch (wdev->iftype) {
 711                 case NL80211_IFTYPE_ADHOC:
 712                         cfg80211_leave_ibss(rdev, dev, true);
 713                         break;
 714                 case NL80211_IFTYPE_STATION:
 715                         wdev_lock(wdev);
 716 #ifdef CONFIG_CFG80211_WEXT
 717                         kfree(wdev->wext.ie);
 718                         wdev->wext.ie = NULL;
 719                         wdev->wext.ie_len = 0;
 720                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 721 #endif
 722                         __cfg80211_disconnect(rdev, dev,
 723                                               WLAN_REASON_DEAUTH_LEAVING, true);
 724                         cfg80211_mlme_down(rdev, dev);
 725                         wdev_unlock(wdev);
 726                         break;
 727                 default:
 728                         break;
 729                 }
 730                 break;
 731         case NETDEV_DOWN:
 732                 dev_hold(dev);
 733                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 734                 break;
 735         case NETDEV_UP:
 736                 /*
 737                  * If we have a really quick DOWN/UP succession we may
 738                  * have this work still pending ... cancel it and see
 739                  * if it was pending, in which case we need to account
 740                  * for some of the work it would have done.
 741                  */
 742                 if (cancel_work_sync(&wdev->cleanup_work)) {
 743                         mutex_lock(&rdev->devlist_mtx);
 744                         rdev->opencount--;
 745                         mutex_unlock(&rdev->devlist_mtx);
 746                         dev_put(dev);
 747                 }
 748                 cfg80211_lock_rdev(rdev);
 749                 mutex_lock(&rdev->devlist_mtx);
 750 #ifdef CONFIG_CFG80211_WEXT
 751                 wdev_lock(wdev);
 752                 switch (wdev->iftype) {
 753                 case NL80211_IFTYPE_ADHOC:
 754                         cfg80211_ibss_wext_join(rdev, wdev);
 755                         break;
 756                 case NL80211_IFTYPE_STATION:
 757                         cfg80211_mgd_wext_connect(rdev, wdev);
 758                         break;
 759                 default:
 760                         break;
 761                 }
 762                 wdev_unlock(wdev);
 763 #endif
 764                 rdev->opencount++;
 765                 mutex_unlock(&rdev->devlist_mtx);
 766                 cfg80211_unlock_rdev(rdev);
 767                 break;
 768         case NETDEV_UNREGISTER:
 769                 /*
 770                  * NB: cannot take rdev->mtx here because this may be
 771                  * called within code protected by it when interfaces
 772                  * are removed with nl80211.
 773                  */
 774                 mutex_lock(&rdev->devlist_mtx);
 775                 /*
 776                  * It is possible to get NETDEV_UNREGISTER
 777                  * multiple times. To detect that, check
 778                  * that the interface is still on the list
 779                  * of registered interfaces, and only then
 780                  * remove and clean it up.
 781                  */
 782                 if (!list_empty(&wdev->list)) {
 783                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 784                         list_del_init(&wdev->list);
 785                         rdev->devlist_generation++;
 786 #ifdef CONFIG_CFG80211_WEXT
 787                         kfree(wdev->wext.keys);
 788 #endif
 789                 }
 790                 mutex_unlock(&rdev->devlist_mtx);
 791                 break;
 792         case NETDEV_PRE_UP:
 793                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 794                         return notifier_from_errno(-EOPNOTSUPP);
 795                 if (rfkill_blocked(rdev->rfkill))
 796                         return notifier_from_errno(-ERFKILL);
 797                 break;
 798         }
 799
 800         return NOTIFY_DONE;
 801 }
 802
 803 static struct notifier_block cfg80211_netdev_notifier = {
 804         .notifier_call = cfg80211_netdev_notifier_call,
 805 };
 806
 807 static void __net_exit cfg80211_pernet_exit(struct net *net)
 808 {
 809         struct cfg80211_registered_device *rdev;
 810
 811         rtnl_lock();
 812         mutex_lock(&cfg80211_mutex);
 813         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 814                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 815                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 816         }
 817         mutex_unlock(&cfg80211_mutex);
 818         rtnl_unlock();
 819 }
 820
 821 static struct pernet_operations cfg80211_pernet_ops = {
 822         .exit = cfg80211_pernet_exit,
 823 };
 824
 825 static int __init cfg80211_init(void)
 826 {
 827         int err;
 828
 829         err = register_pernet_device(&cfg80211_pernet_ops);
 830         if (err)
 831                 goto out_fail_pernet;
 832
 833         err = wiphy_sysfs_init();
 834         if (err)
 835                 goto out_fail_sysfs;
 836
 837         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 838         if (err)
 839                 goto out_fail_notifier;
 840
 841         err = nl80211_init();
 842         if (err)
 843                 goto out_fail_nl80211;
 844
 845         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 846
 847         err = regulatory_init();
 848         if (err)
 849                 goto out_fail_reg;
 850
 851         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 852         if (!cfg80211_wq)
 853                 goto out_fail_wq;
 854
 855         return 0;
 856
 857 out_fail_wq:
 858         regulatory_exit();
 859 out_fail_reg:
 860         debugfs_remove(ieee80211_debugfs_dir);
 861 out_fail_nl80211:
 862         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 863 out_fail_notifier:
 864         wiphy_sysfs_exit();
 865 out_fail_sysfs:
 866         unregister_pernet_device(&cfg80211_pernet_ops);
 867 out_fail_pernet:
 868         return err;
 869 }
 870 subsys_initcall(cfg80211_init);
 871
 872 static void cfg80211_exit(void)
 873 {
 874         debugfs_remove(ieee80211_debugfs_dir);
 875         nl80211_exit();
 876         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 877         wiphy_sysfs_exit();
 878         regulatory_exit();
 879         unregister_pernet_device(&cfg80211_pernet_ops);
 880         destroy_workqueue(cfg80211_wq);
 881 }
 882 module_exit(cfg80211_exit);