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 <net/genetlink.h>
  18 #include <net/cfg80211.h>
  19 #include "nl80211.h"
  20 #include "core.h"
  21 #include "sysfs.h"
  22 #include "debugfs.h"
  23 #include "wext-compat.h"
  24
  25 /* name for sysfs, %d is appended */
  26 #define PHY_NAME "phy"
  27
  28 MODULE_AUTHOR("Johannes Berg");
  29 MODULE_LICENSE("GPL");
  30 MODULE_DESCRIPTION("wireless configuration support");
  31
  32 /* RCU might be appropriate here since we usually
  33  * only read the list, and that can happen quite
  34  * often because we need to do it for each command */
  35 LIST_HEAD(cfg80211_rdev_list);
  36 int cfg80211_rdev_list_generation;
  37
  38 /*
  39  * This is used to protect the cfg80211_rdev_list
  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_event_work(struct work_struct *work)
 298 {
 299         struct cfg80211_registered_device *rdev;
 300
 301         rdev = container_of(work, struct cfg80211_registered_device,
 302                             event_work);
 303
 304         rtnl_lock();
 305         cfg80211_lock_rdev(rdev);
 306
 307         cfg80211_process_rdev_events(rdev);
 308         cfg80211_unlock_rdev(rdev);
 309         rtnl_unlock();
 310 }
 311
 312 /* exported functions */
 313
 314 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 315 {
 316         static int wiphy_counter;
 317
 318         struct cfg80211_registered_device *rdev;
 319         int alloc_size;
 320
 321         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 322         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 323         WARN_ON(ops->connect && !ops->disconnect);
 324         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 325         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 326         WARN_ON(ops->add_station && !ops->del_station);
 327         WARN_ON(ops->add_mpath && !ops->del_mpath);
 328
 329         alloc_size = sizeof(*rdev) + sizeof_priv;
 330
 331         rdev = kzalloc(alloc_size, GFP_KERNEL);
 332         if (!rdev)
 333                 return NULL;
 334
 335         rdev->ops = ops;
 336
 337         mutex_lock(&cfg80211_mutex);
 338
 339         rdev->wiphy_idx = wiphy_counter++;
 340
 341         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 342                 wiphy_counter--;
 343                 mutex_unlock(&cfg80211_mutex);
 344                 /* ugh, wrapped! */
 345                 kfree(rdev);
 346                 return NULL;
 347         }
 348
 349         mutex_unlock(&cfg80211_mutex);
 350
 351         /* give it a proper name */
 352         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 353
 354         mutex_init(&rdev->mtx);
 355         mutex_init(&rdev->devlist_mtx);
 356         INIT_LIST_HEAD(&rdev->netdev_list);
 357         spin_lock_init(&rdev->bss_lock);
 358         INIT_LIST_HEAD(&rdev->bss_list);
 359         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 360
 361         device_initialize(&rdev->wiphy.dev);
 362         rdev->wiphy.dev.class = &ieee80211_class;
 363         rdev->wiphy.dev.platform_data = rdev;
 364
 365         rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 366
 367         wiphy_net_set(&rdev->wiphy, &init_net);
 368
 369         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 370         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 371                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 372                                    &rdev->rfkill_ops, rdev);
 373
 374         if (!rdev->rfkill) {
 375                 kfree(rdev);
 376                 return NULL;
 377         }
 378
 379         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 380         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 381         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 382
 383         init_waitqueue_head(&rdev->dev_wait);
 384
 385         /*
 386          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 387          * Fragmentation and RTS threshold are disabled by default with the
 388          * special -1 value.
 389          */
 390         rdev->wiphy.retry_short = 7;
 391         rdev->wiphy.retry_long = 4;
 392         rdev->wiphy.frag_threshold = (u32) -1;
 393         rdev->wiphy.rts_threshold = (u32) -1;
 394
 395         return &rdev->wiphy;
 396 }
 397 EXPORT_SYMBOL(wiphy_new);
 398
 399 int wiphy_register(struct wiphy *wiphy)
 400 {
 401         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 402         int res;
 403         enum ieee80211_band band;
 404         struct ieee80211_supported_band *sband;
 405         bool have_band = false;
 406         int i;
 407         u16 ifmodes = wiphy->interface_modes;
 408
 409         /* sanity check ifmodes */
 410         WARN_ON(!ifmodes);
 411         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 412         if (WARN_ON(ifmodes != wiphy->interface_modes))
 413                 wiphy->interface_modes = ifmodes;
 414
 415         /* sanity check supported bands/channels */
 416         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 417                 sband = wiphy->bands[band];
 418                 if (!sband)
 419                         continue;
 420
 421                 sband->band = band;
 422
 423                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 424                         return -EINVAL;
 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
 434                 for (i = 0; i < sband->n_channels; i++) {
 435                         sband->channels[i].orig_flags =
 436                                 sband->channels[i].flags;
 437                         sband->channels[i].orig_mag =
 438                                 sband->channels[i].max_antenna_gain;
 439                         sband->channels[i].orig_mpwr =
 440                                 sband->channels[i].max_power;
 441                         sband->channels[i].band = band;
 442                 }
 443
 444                 have_band = true;
 445         }
 446
 447         if (!have_band) {
 448                 WARN_ON(1);
 449                 return -EINVAL;
 450         }
 451
 452         /* check and set up bitrates */
 453         ieee80211_set_bitrate_flags(wiphy);
 454
 455         res = device_add(&rdev->wiphy.dev);
 456         if (res)
 457                 return res;
 458
 459         res = rfkill_register(rdev->rfkill);
 460         if (res)
 461                 goto out_rm_dev;
 462
 463         mutex_lock(&cfg80211_mutex);
 464
 465         /* set up regulatory info */
 466         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 467
 468         list_add(&rdev->list, &cfg80211_rdev_list);
 469         cfg80211_rdev_list_generation++;
 470
 471         mutex_unlock(&cfg80211_mutex);
 472
 473         /* add to debugfs */
 474         rdev->wiphy.debugfsdir =
 475                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 476                                    ieee80211_debugfs_dir);
 477         if (IS_ERR(rdev->wiphy.debugfsdir))
 478                 rdev->wiphy.debugfsdir = NULL;
 479
 480         if (wiphy->custom_regulatory) {
 481                 struct regulatory_request request;
 482
 483                 request.wiphy_idx = get_wiphy_idx(wiphy);
 484                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 485                 request.alpha2[0] = '9';
 486                 request.alpha2[1] = '9';
 487
 488                 nl80211_send_reg_change_event(&request);
 489         }
 490
 491         cfg80211_debugfs_rdev_add(rdev);
 492
 493         return 0;
 494
 495  out_rm_dev:
 496         device_del(&rdev->wiphy.dev);
 497         return res;
 498 }
 499 EXPORT_SYMBOL(wiphy_register);
 500
 501 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 502 {
 503         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 504
 505         if (!rdev->ops->rfkill_poll)
 506                 return;
 507         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 508         rfkill_resume_polling(rdev->rfkill);
 509 }
 510 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 511
 512 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 513 {
 514         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 515
 516         rfkill_pause_polling(rdev->rfkill);
 517 }
 518 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 519
 520 void wiphy_unregister(struct wiphy *wiphy)
 521 {
 522         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 523
 524         rfkill_unregister(rdev->rfkill);
 525
 526         /* protect the device list */
 527         mutex_lock(&cfg80211_mutex);
 528
 529         wait_event(rdev->dev_wait, ({
 530                 int __count;
 531                 mutex_lock(&rdev->devlist_mtx);
 532                 __count = rdev->opencount;
 533                 mutex_unlock(&rdev->devlist_mtx);
 534                 __count == 0;}));
 535
 536         mutex_lock(&rdev->devlist_mtx);
 537         BUG_ON(!list_empty(&rdev->netdev_list));
 538         mutex_unlock(&rdev->devlist_mtx);
 539
 540         /*
 541          * First remove the hardware from everywhere, this makes
 542          * it impossible to find from userspace.
 543          */
 544         cfg80211_debugfs_rdev_del(rdev);
 545         list_del(&rdev->list);
 546
 547         /*
 548          * Try to grab rdev->mtx. If a command is still in progress,
 549          * hopefully the driver will refuse it since it's tearing
 550          * down the device already. We wait for this command to complete
 551          * before unlinking the item from the list.
 552          * Note: as codified by the BUG_ON above we cannot get here if
 553          * a virtual interface is still present. Hence, we can only get
 554          * to lock contention here if userspace issues a command that
 555          * identified the hardware by wiphy index.
 556          */
 557         cfg80211_lock_rdev(rdev);
 558         /* nothing */
 559         cfg80211_unlock_rdev(rdev);
 560
 561         /* If this device got a regulatory hint tell core its
 562          * free to listen now to a new shiny device regulatory hint */
 563         reg_device_remove(wiphy);
 564
 565         cfg80211_rdev_list_generation++;
 566         device_del(&rdev->wiphy.dev);
 567         debugfs_remove(rdev->wiphy.debugfsdir);
 568
 569         mutex_unlock(&cfg80211_mutex);
 570
 571         flush_work(&rdev->scan_done_wk);
 572         cancel_work_sync(&rdev->conn_work);
 573         flush_work(&rdev->event_work);
 574 }
 575 EXPORT_SYMBOL(wiphy_unregister);
 576
 577 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 578 {
 579         struct cfg80211_internal_bss *scan, *tmp;
 580         rfkill_destroy(rdev->rfkill);
 581         mutex_destroy(&rdev->mtx);
 582         mutex_destroy(&rdev->devlist_mtx);
 583         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 584                 cfg80211_put_bss(&scan->pub);
 585         kfree(rdev);
 586 }
 587
 588 void wiphy_free(struct wiphy *wiphy)
 589 {
 590         put_device(&wiphy->dev);
 591 }
 592 EXPORT_SYMBOL(wiphy_free);
 593
 594 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 595 {
 596         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 597
 598         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 599                 schedule_work(&rdev->rfkill_sync);
 600 }
 601 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 602
 603 static void wdev_cleanup_work(struct work_struct *work)
 604 {
 605         struct wireless_dev *wdev;
 606         struct cfg80211_registered_device *rdev;
 607
 608         wdev = container_of(work, struct wireless_dev, cleanup_work);
 609         rdev = wiphy_to_dev(wdev->wiphy);
 610
 611         cfg80211_lock_rdev(rdev);
 612
 613         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 614                 rdev->scan_req->aborted = true;
 615                 ___cfg80211_scan_done(rdev, true);
 616         }
 617
 618         cfg80211_unlock_rdev(rdev);
 619
 620         mutex_lock(&rdev->devlist_mtx);
 621         rdev->opencount--;
 622         mutex_unlock(&rdev->devlist_mtx);
 623         wake_up(&rdev->dev_wait);
 624
 625         dev_put(wdev->netdev);
 626 }
 627
 628 static struct device_type wiphy_type = {
 629         .name   = "wlan",
 630 };
 631
 632 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 633                                          unsigned long state,
 634                                          void *ndev)
 635 {
 636         struct net_device *dev = ndev;
 637         struct wireless_dev *wdev = dev->ieee80211_ptr;
 638         struct cfg80211_registered_device *rdev;
 639
 640         if (!wdev)
 641                 return NOTIFY_DONE;
 642
 643         rdev = wiphy_to_dev(wdev->wiphy);
 644
 645         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 646
 647         switch (state) {
 648         case NETDEV_POST_INIT:
 649                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 650                 break;
 651         case NETDEV_REGISTER:
 652                 /*
 653                  * NB: cannot take rdev->mtx here because this may be
 654                  * called within code protected by it when interfaces
 655                  * are added with nl80211.
 656                  */
 657                 mutex_init(&wdev->mtx);
 658                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 659                 INIT_LIST_HEAD(&wdev->event_list);
 660                 spin_lock_init(&wdev->event_lock);
 661                 mutex_lock(&rdev->devlist_mtx);
 662                 list_add(&wdev->list, &rdev->netdev_list);
 663                 rdev->devlist_generation++;
 664                 /* can only change netns with wiphy */
 665                 dev->features |= NETIF_F_NETNS_LOCAL;
 666
 667                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 668                                       "phy80211")) {
 669                         printk(KERN_ERR "wireless: failed to add phy80211 "
 670                                 "symlink to netdev!\n");
 671                 }
 672                 wdev->netdev = dev;
 673                 wdev->sme_state = CFG80211_SME_IDLE;
 674                 mutex_unlock(&rdev->devlist_mtx);
 675 #ifdef CONFIG_WIRELESS_EXT
 676                 if (!dev->wireless_handlers)
 677                         dev->wireless_handlers = &cfg80211_wext_handler;
 678                 wdev->wext.default_key = -1;
 679                 wdev->wext.default_mgmt_key = -1;
 680                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 681                 wdev->wext.ps = wdev->wiphy->ps_default;
 682                 wdev->wext.ps_timeout = 100;
 683                 if (rdev->ops->set_power_mgmt)
 684                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 685                                                       wdev->wext.ps,
 686                                                       wdev->wext.ps_timeout)) {
 687                                 /* assume this means it's off */
 688                                 wdev->wext.ps = false;
 689                         }
 690 #endif
 691                 break;
 692         case NETDEV_GOING_DOWN:
 693                 switch (wdev->iftype) {
 694                 case NL80211_IFTYPE_ADHOC:
 695                         cfg80211_leave_ibss(rdev, dev, true);
 696                         break;
 697                 case NL80211_IFTYPE_STATION:
 698                         wdev_lock(wdev);
 699 #ifdef CONFIG_WIRELESS_EXT
 700                         kfree(wdev->wext.ie);
 701                         wdev->wext.ie = NULL;
 702                         wdev->wext.ie_len = 0;
 703                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 704 #endif
 705                         __cfg80211_disconnect(rdev, dev,
 706                                               WLAN_REASON_DEAUTH_LEAVING, true);
 707                         cfg80211_mlme_down(rdev, dev);
 708                         wdev_unlock(wdev);
 709                         break;
 710                 default:
 711                         break;
 712                 }
 713                 break;
 714         case NETDEV_DOWN:
 715                 dev_hold(dev);
 716                 schedule_work(&wdev->cleanup_work);
 717                 break;
 718         case NETDEV_UP:
 719                 /*
 720                  * If we have a really quick DOWN/UP succession we may
 721                  * have this work still pending ... cancel it and see
 722                  * if it was pending, in which case we need to account
 723                  * for some of the work it would have done.
 724                  */
 725                 if (cancel_work_sync(&wdev->cleanup_work)) {
 726                         mutex_lock(&rdev->devlist_mtx);
 727                         rdev->opencount--;
 728                         mutex_unlock(&rdev->devlist_mtx);
 729                         dev_put(dev);
 730                 }
 731 #ifdef CONFIG_WIRELESS_EXT
 732                 cfg80211_lock_rdev(rdev);
 733                 mutex_lock(&rdev->devlist_mtx);
 734                 wdev_lock(wdev);
 735                 switch (wdev->iftype) {
 736                 case NL80211_IFTYPE_ADHOC:
 737                         cfg80211_ibss_wext_join(rdev, wdev);
 738                         break;
 739                 case NL80211_IFTYPE_STATION:
 740                         cfg80211_mgd_wext_connect(rdev, wdev);
 741                         break;
 742                 default:
 743                         break;
 744                 }
 745                 wdev_unlock(wdev);
 746                 rdev->opencount++;
 747                 mutex_unlock(&rdev->devlist_mtx);
 748                 cfg80211_unlock_rdev(rdev);
 749 #endif
 750                 break;
 751         case NETDEV_UNREGISTER:
 752                 /*
 753                  * NB: cannot take rdev->mtx here because this may be
 754                  * called within code protected by it when interfaces
 755                  * are removed with nl80211.
 756                  */
 757                 mutex_lock(&rdev->devlist_mtx);
 758                 /*
 759                  * It is possible to get NETDEV_UNREGISTER
 760                  * multiple times. To detect that, check
 761                  * that the interface is still on the list
 762                  * of registered interfaces, and only then
 763                  * remove and clean it up.
 764                  */
 765                 if (!list_empty(&wdev->list)) {
 766                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 767                         list_del_init(&wdev->list);
 768                         rdev->devlist_generation++;
 769 #ifdef CONFIG_WIRELESS_EXT
 770                         kfree(wdev->wext.keys);
 771 #endif
 772                 }
 773                 mutex_unlock(&rdev->devlist_mtx);
 774                 break;
 775         case NETDEV_PRE_UP:
 776                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 777                         return notifier_from_errno(-EOPNOTSUPP);
 778                 if (rfkill_blocked(rdev->rfkill))
 779                         return notifier_from_errno(-ERFKILL);
 780                 break;
 781         }
 782
 783         return NOTIFY_DONE;
 784 }
 785
 786 static struct notifier_block cfg80211_netdev_notifier = {
 787         .notifier_call = cfg80211_netdev_notifier_call,
 788 };
 789
 790 static void __net_exit cfg80211_pernet_exit(struct net *net)
 791 {
 792         struct cfg80211_registered_device *rdev;
 793
 794         rtnl_lock();
 795         mutex_lock(&cfg80211_mutex);
 796         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 797                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 798                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 799         }
 800         mutex_unlock(&cfg80211_mutex);
 801         rtnl_unlock();
 802 }
 803
 804 static struct pernet_operations cfg80211_pernet_ops = {
 805         .exit = cfg80211_pernet_exit,
 806 };
 807
 808 static int __init cfg80211_init(void)
 809 {
 810         int err;
 811
 812         err = register_pernet_device(&cfg80211_pernet_ops);
 813         if (err)
 814                 goto out_fail_pernet;
 815
 816         err = wiphy_sysfs_init();
 817         if (err)
 818                 goto out_fail_sysfs;
 819
 820         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 821         if (err)
 822                 goto out_fail_notifier;
 823
 824         err = nl80211_init();
 825         if (err)
 826                 goto out_fail_nl80211;
 827
 828         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 829
 830         err = regulatory_init();
 831         if (err)
 832                 goto out_fail_reg;
 833
 834         return 0;
 835
 836 out_fail_reg:
 837         debugfs_remove(ieee80211_debugfs_dir);
 838 out_fail_nl80211:
 839         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 840 out_fail_notifier:
 841         wiphy_sysfs_exit();
 842 out_fail_sysfs:
 843         unregister_pernet_device(&cfg80211_pernet_ops);
 844 out_fail_pernet:
 845         return err;
 846 }
 847 subsys_initcall(cfg80211_init);
 848
 849 static void cfg80211_exit(void)
 850 {
 851         debugfs_remove(ieee80211_debugfs_dir);
 852         nl80211_exit();
 853         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 854         wiphy_sysfs_exit();
 855         regulatory_exit();
 856         unregister_pernet_device(&cfg80211_pernet_ops);
 857 }
 858 module_exit(cfg80211_exit);