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_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, is_zero_ether_addr(ev->cr.bssid) ?
 314                                 NULL : ev->cr.bssid,
 315                                 ev->cr.req_ie, ev->cr.req_ie_len,
 316                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 317                                 ev->cr.status,
 318                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 319                                 NULL);
 320                         break;
 321                 case EVENT_ROAMED:
 322                         __cfg80211_roamed(wdev, ev->rm.bssid,
 323                                           ev->rm.req_ie, ev->rm.req_ie_len,
 324                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 325                         break;
 326                 case EVENT_DISCONNECTED:
 327                         __cfg80211_disconnected(wdev->netdev,
 328                                                 ev->dc.ie, ev->dc.ie_len,
 329                                                 ev->dc.reason, true);
 330                         break;
 331                 case EVENT_IBSS_JOINED:
 332                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 333                         break;
 334                 }
 335                 wdev_unlock(wdev);
 336
 337                 kfree(ev);
 338
 339                 spin_lock_irqsave(&wdev->event_lock, flags);
 340         }
 341         spin_unlock_irqrestore(&wdev->event_lock, flags);
 342 }
 343
 344 static void cfg80211_event_work(struct work_struct *work)
 345 {
 346         struct cfg80211_registered_device *rdev;
 347         struct wireless_dev *wdev;
 348
 349         rdev = container_of(work, struct cfg80211_registered_device,
 350                             event_work);
 351
 352         rtnl_lock();
 353         cfg80211_lock_rdev(rdev);
 354         mutex_lock(&rdev->devlist_mtx);
 355
 356         list_for_each_entry(wdev, &rdev->netdev_list, list)
 357                 cfg80211_process_events(wdev);
 358
 359         mutex_unlock(&rdev->devlist_mtx);
 360         cfg80211_unlock_rdev(rdev);
 361         rtnl_unlock();
 362 }
 363
 364 /* exported functions */
 365
 366 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 367 {
 368         static int wiphy_counter;
 369
 370         struct cfg80211_registered_device *rdev;
 371         int alloc_size;
 372
 373         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 374         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 375         WARN_ON(ops->connect && !ops->disconnect);
 376         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 377         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 378         WARN_ON(ops->add_station && !ops->del_station);
 379         WARN_ON(ops->add_mpath && !ops->del_mpath);
 380
 381         alloc_size = sizeof(*rdev) + sizeof_priv;
 382
 383         rdev = kzalloc(alloc_size, GFP_KERNEL);
 384         if (!rdev)
 385                 return NULL;
 386
 387         rdev->ops = ops;
 388
 389         mutex_lock(&cfg80211_mutex);
 390
 391         rdev->wiphy_idx = wiphy_counter++;
 392
 393         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 394                 wiphy_counter--;
 395                 mutex_unlock(&cfg80211_mutex);
 396                 /* ugh, wrapped! */
 397                 kfree(rdev);
 398                 return NULL;
 399         }
 400
 401         mutex_unlock(&cfg80211_mutex);
 402
 403         /* give it a proper name */
 404         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 405
 406         mutex_init(&rdev->mtx);
 407         mutex_init(&rdev->devlist_mtx);
 408         INIT_LIST_HEAD(&rdev->netdev_list);
 409         spin_lock_init(&rdev->bss_lock);
 410         INIT_LIST_HEAD(&rdev->bss_list);
 411         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 412
 413         device_initialize(&rdev->wiphy.dev);
 414         rdev->wiphy.dev.class = &ieee80211_class;
 415         rdev->wiphy.dev.platform_data = rdev;
 416
 417         rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 418
 419         wiphy_net_set(&rdev->wiphy, &init_net);
 420
 421         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 422         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 423                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 424                                    &rdev->rfkill_ops, rdev);
 425
 426         if (!rdev->rfkill) {
 427                 kfree(rdev);
 428                 return NULL;
 429         }
 430
 431         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 432         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 433         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 434
 435         init_waitqueue_head(&rdev->dev_wait);
 436
 437         /*
 438          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 439          * Fragmentation and RTS threshold are disabled by default with the
 440          * special -1 value.
 441          */
 442         rdev->wiphy.retry_short = 7;
 443         rdev->wiphy.retry_long = 4;
 444         rdev->wiphy.frag_threshold = (u32) -1;
 445         rdev->wiphy.rts_threshold = (u32) -1;
 446
 447         return &rdev->wiphy;
 448 }
 449 EXPORT_SYMBOL(wiphy_new);
 450
 451 int wiphy_register(struct wiphy *wiphy)
 452 {
 453         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 454         int res;
 455         enum ieee80211_band band;
 456         struct ieee80211_supported_band *sband;
 457         bool have_band = false;
 458         int i;
 459         u16 ifmodes = wiphy->interface_modes;
 460
 461         /* sanity check ifmodes */
 462         WARN_ON(!ifmodes);
 463         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 464         if (WARN_ON(ifmodes != wiphy->interface_modes))
 465                 wiphy->interface_modes = ifmodes;
 466
 467         /* sanity check supported bands/channels */
 468         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 469                 sband = wiphy->bands[band];
 470                 if (!sband)
 471                         continue;
 472
 473                 sband->band = band;
 474
 475                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 476                         return -EINVAL;
 477
 478                 /*
 479                  * Since we use a u32 for rate bitmaps in
 480                  * ieee80211_get_response_rate, we cannot
 481                  * have more than 32 legacy rates.
 482                  */
 483                 if (WARN_ON(sband->n_bitrates > 32))
 484                         return -EINVAL;
 485
 486                 for (i = 0; i < sband->n_channels; i++) {
 487                         sband->channels[i].orig_flags =
 488                                 sband->channels[i].flags;
 489                         sband->channels[i].orig_mag =
 490                                 sband->channels[i].max_antenna_gain;
 491                         sband->channels[i].orig_mpwr =
 492                                 sband->channels[i].max_power;
 493                         sband->channels[i].band = band;
 494                 }
 495
 496                 have_band = true;
 497         }
 498
 499         if (!have_band) {
 500                 WARN_ON(1);
 501                 return -EINVAL;
 502         }
 503
 504         /* check and set up bitrates */
 505         ieee80211_set_bitrate_flags(wiphy);
 506
 507         res = device_add(&rdev->wiphy.dev);
 508         if (res)
 509                 return res;
 510
 511         res = rfkill_register(rdev->rfkill);
 512         if (res)
 513                 goto out_rm_dev;
 514
 515         mutex_lock(&cfg80211_mutex);
 516
 517         /* set up regulatory info */
 518         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 519
 520         list_add(&rdev->list, &cfg80211_rdev_list);
 521         cfg80211_rdev_list_generation++;
 522
 523         mutex_unlock(&cfg80211_mutex);
 524
 525         /* add to debugfs */
 526         rdev->wiphy.debugfsdir =
 527                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 528                                    ieee80211_debugfs_dir);
 529         if (IS_ERR(rdev->wiphy.debugfsdir))
 530                 rdev->wiphy.debugfsdir = NULL;
 531
 532         if (wiphy->custom_regulatory) {
 533                 struct regulatory_request request;
 534
 535                 request.wiphy_idx = get_wiphy_idx(wiphy);
 536                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 537                 request.alpha2[0] = '9';
 538                 request.alpha2[1] = '9';
 539
 540                 nl80211_send_reg_change_event(&request);
 541         }
 542
 543         cfg80211_debugfs_rdev_add(rdev);
 544
 545         return 0;
 546
 547  out_rm_dev:
 548         device_del(&rdev->wiphy.dev);
 549         return res;
 550 }
 551 EXPORT_SYMBOL(wiphy_register);
 552
 553 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 554 {
 555         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 556
 557         if (!rdev->ops->rfkill_poll)
 558                 return;
 559         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 560         rfkill_resume_polling(rdev->rfkill);
 561 }
 562 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 563
 564 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 565 {
 566         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 567
 568         rfkill_pause_polling(rdev->rfkill);
 569 }
 570 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 571
 572 void wiphy_unregister(struct wiphy *wiphy)
 573 {
 574         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 575
 576         rfkill_unregister(rdev->rfkill);
 577
 578         /* protect the device list */
 579         mutex_lock(&cfg80211_mutex);
 580
 581         wait_event(rdev->dev_wait, ({
 582                 int __count;
 583                 mutex_lock(&rdev->devlist_mtx);
 584                 __count = rdev->opencount;
 585                 mutex_unlock(&rdev->devlist_mtx);
 586                 __count == 0;}));
 587
 588         mutex_lock(&rdev->devlist_mtx);
 589         BUG_ON(!list_empty(&rdev->netdev_list));
 590         mutex_unlock(&rdev->devlist_mtx);
 591
 592         /*
 593          * First remove the hardware from everywhere, this makes
 594          * it impossible to find from userspace.
 595          */
 596         cfg80211_debugfs_rdev_del(rdev);
 597         list_del(&rdev->list);
 598
 599         /*
 600          * Try to grab rdev->mtx. If a command is still in progress,
 601          * hopefully the driver will refuse it since it's tearing
 602          * down the device already. We wait for this command to complete
 603          * before unlinking the item from the list.
 604          * Note: as codified by the BUG_ON above we cannot get here if
 605          * a virtual interface is still present. Hence, we can only get
 606          * to lock contention here if userspace issues a command that
 607          * identified the hardware by wiphy index.
 608          */
 609         cfg80211_lock_rdev(rdev);
 610         /* nothing */
 611         cfg80211_unlock_rdev(rdev);
 612
 613         /* If this device got a regulatory hint tell core its
 614          * free to listen now to a new shiny device regulatory hint */
 615         reg_device_remove(wiphy);
 616
 617         cfg80211_rdev_list_generation++;
 618         device_del(&rdev->wiphy.dev);
 619         debugfs_remove(rdev->wiphy.debugfsdir);
 620
 621         mutex_unlock(&cfg80211_mutex);
 622
 623         flush_work(&rdev->scan_done_wk);
 624         cancel_work_sync(&rdev->conn_work);
 625         flush_work(&rdev->event_work);
 626 }
 627 EXPORT_SYMBOL(wiphy_unregister);
 628
 629 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 630 {
 631         struct cfg80211_internal_bss *scan, *tmp;
 632         rfkill_destroy(rdev->rfkill);
 633         mutex_destroy(&rdev->mtx);
 634         mutex_destroy(&rdev->devlist_mtx);
 635         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 636                 cfg80211_put_bss(&scan->pub);
 637         kfree(rdev);
 638 }
 639
 640 void wiphy_free(struct wiphy *wiphy)
 641 {
 642         put_device(&wiphy->dev);
 643 }
 644 EXPORT_SYMBOL(wiphy_free);
 645
 646 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 647 {
 648         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 649
 650         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 651                 schedule_work(&rdev->rfkill_sync);
 652 }
 653 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 654
 655 static void wdev_cleanup_work(struct work_struct *work)
 656 {
 657         struct wireless_dev *wdev;
 658         struct cfg80211_registered_device *rdev;
 659
 660         wdev = container_of(work, struct wireless_dev, cleanup_work);
 661         rdev = wiphy_to_dev(wdev->wiphy);
 662
 663         cfg80211_lock_rdev(rdev);
 664
 665         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 666                 rdev->scan_req->aborted = true;
 667                 ___cfg80211_scan_done(rdev, true);
 668         }
 669
 670         cfg80211_unlock_rdev(rdev);
 671
 672         mutex_lock(&rdev->devlist_mtx);
 673         rdev->opencount--;
 674         mutex_unlock(&rdev->devlist_mtx);
 675         wake_up(&rdev->dev_wait);
 676
 677         dev_put(wdev->netdev);
 678 }
 679
 680 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 681                                          unsigned long state,
 682                                          void *ndev)
 683 {
 684         struct net_device *dev = ndev;
 685         struct wireless_dev *wdev = dev->ieee80211_ptr;
 686         struct cfg80211_registered_device *rdev;
 687
 688         if (!wdev)
 689                 return NOTIFY_DONE;
 690
 691         rdev = wiphy_to_dev(wdev->wiphy);
 692
 693         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 694
 695         switch (state) {
 696         case NETDEV_REGISTER:
 697                 /*
 698                  * NB: cannot take rdev->mtx here because this may be
 699                  * called within code protected by it when interfaces
 700                  * are added with nl80211.
 701                  */
 702                 mutex_init(&wdev->mtx);
 703                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 704                 INIT_LIST_HEAD(&wdev->event_list);
 705                 spin_lock_init(&wdev->event_lock);
 706                 mutex_lock(&rdev->devlist_mtx);
 707                 list_add(&wdev->list, &rdev->netdev_list);
 708                 rdev->devlist_generation++;
 709                 /* can only change netns with wiphy */
 710                 dev->features |= NETIF_F_NETNS_LOCAL;
 711
 712                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 713                                       "phy80211")) {
 714                         printk(KERN_ERR "wireless: failed to add phy80211 "
 715                                 "symlink to netdev!\n");
 716                 }
 717                 wdev->netdev = dev;
 718                 wdev->sme_state = CFG80211_SME_IDLE;
 719                 mutex_unlock(&rdev->devlist_mtx);
 720 #ifdef CONFIG_WIRELESS_EXT
 721                 if (!dev->wireless_handlers)
 722                         dev->wireless_handlers = &cfg80211_wext_handler;
 723                 wdev->wext.default_key = -1;
 724                 wdev->wext.default_mgmt_key = -1;
 725                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 726                 wdev->wext.ps = wdev->wiphy->ps_default;
 727                 wdev->wext.ps_timeout = 100;
 728                 if (rdev->ops->set_power_mgmt)
 729                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 730                                                       wdev->wext.ps,
 731                                                       wdev->wext.ps_timeout)) {
 732                                 /* assume this means it's off */
 733                                 wdev->wext.ps = false;
 734                         }
 735 #endif
 736                 break;
 737         case NETDEV_GOING_DOWN:
 738                 switch (wdev->iftype) {
 739                 case NL80211_IFTYPE_ADHOC:
 740                         cfg80211_leave_ibss(rdev, dev, true);
 741                         break;
 742                 case NL80211_IFTYPE_STATION:
 743                         wdev_lock(wdev);
 744 #ifdef CONFIG_WIRELESS_EXT
 745                         kfree(wdev->wext.ie);
 746                         wdev->wext.ie = NULL;
 747                         wdev->wext.ie_len = 0;
 748                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 749 #endif
 750                         __cfg80211_disconnect(rdev, dev,
 751                                               WLAN_REASON_DEAUTH_LEAVING, true);
 752                         cfg80211_mlme_down(rdev, dev);
 753                         wdev_unlock(wdev);
 754                         break;
 755                 default:
 756                         break;
 757                 }
 758                 break;
 759         case NETDEV_DOWN:
 760                 dev_hold(dev);
 761                 schedule_work(&wdev->cleanup_work);
 762                 break;
 763         case NETDEV_UP:
 764                 /*
 765                  * If we have a really quick DOWN/UP succession we may
 766                  * have this work still pending ... cancel it and see
 767                  * if it was pending, in which case we need to account
 768                  * for some of the work it would have done.
 769                  */
 770                 if (cancel_work_sync(&wdev->cleanup_work)) {
 771                         mutex_lock(&rdev->devlist_mtx);
 772                         rdev->opencount--;
 773                         mutex_unlock(&rdev->devlist_mtx);
 774                         dev_put(dev);
 775                 }
 776 #ifdef CONFIG_WIRELESS_EXT
 777                 cfg80211_lock_rdev(rdev);
 778                 mutex_lock(&rdev->devlist_mtx);
 779                 wdev_lock(wdev);
 780                 switch (wdev->iftype) {
 781                 case NL80211_IFTYPE_ADHOC:
 782                         cfg80211_ibss_wext_join(rdev, wdev);
 783                         break;
 784                 case NL80211_IFTYPE_STATION:
 785                         cfg80211_mgd_wext_connect(rdev, wdev);
 786                         break;
 787                 default:
 788                         break;
 789                 }
 790                 wdev_unlock(wdev);
 791                 rdev->opencount++;
 792                 mutex_unlock(&rdev->devlist_mtx);
 793                 cfg80211_unlock_rdev(rdev);
 794 #endif
 795                 break;
 796         case NETDEV_UNREGISTER:
 797                 /*
 798                  * NB: cannot take rdev->mtx here because this may be
 799                  * called within code protected by it when interfaces
 800                  * are removed with nl80211.
 801                  */
 802                 mutex_lock(&rdev->devlist_mtx);
 803                 /*
 804                  * It is possible to get NETDEV_UNREGISTER
 805                  * multiple times. To detect that, check
 806                  * that the interface is still on the list
 807                  * of registered interfaces, and only then
 808                  * remove and clean it up.
 809                  */
 810                 if (!list_empty(&wdev->list)) {
 811                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 812                         list_del_init(&wdev->list);
 813                         rdev->devlist_generation++;
 814 #ifdef CONFIG_WIRELESS_EXT
 815                         kfree(wdev->wext.keys);
 816 #endif
 817                 }
 818                 mutex_unlock(&rdev->devlist_mtx);
 819                 break;
 820         case NETDEV_PRE_UP:
 821                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 822                         return notifier_from_errno(-EOPNOTSUPP);
 823                 if (rfkill_blocked(rdev->rfkill))
 824                         return notifier_from_errno(-ERFKILL);
 825                 break;
 826         }
 827
 828         return NOTIFY_DONE;
 829 }
 830
 831 static struct notifier_block cfg80211_netdev_notifier = {
 832         .notifier_call = cfg80211_netdev_notifier_call,
 833 };
 834
 835 static void __net_exit cfg80211_pernet_exit(struct net *net)
 836 {
 837         struct cfg80211_registered_device *rdev;
 838
 839         rtnl_lock();
 840         mutex_lock(&cfg80211_mutex);
 841         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 842                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 843                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 844         }
 845         mutex_unlock(&cfg80211_mutex);
 846         rtnl_unlock();
 847 }
 848
 849 static struct pernet_operations cfg80211_pernet_ops = {
 850         .exit = cfg80211_pernet_exit,
 851 };
 852
 853 static int __init cfg80211_init(void)
 854 {
 855         int err;
 856
 857         err = register_pernet_device(&cfg80211_pernet_ops);
 858         if (err)
 859                 goto out_fail_pernet;
 860
 861         err = wiphy_sysfs_init();
 862         if (err)
 863                 goto out_fail_sysfs;
 864
 865         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 866         if (err)
 867                 goto out_fail_notifier;
 868
 869         err = nl80211_init();
 870         if (err)
 871                 goto out_fail_nl80211;
 872
 873         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 874
 875         err = regulatory_init();
 876         if (err)
 877                 goto out_fail_reg;
 878
 879         return 0;
 880
 881 out_fail_reg:
 882         debugfs_remove(ieee80211_debugfs_dir);
 883 out_fail_nl80211:
 884         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 885 out_fail_notifier:
 886         wiphy_sysfs_exit();
 887 out_fail_sysfs:
 888         unregister_pernet_device(&cfg80211_pernet_ops);
 889 out_fail_pernet:
 890         return err;
 891 }
 892 subsys_initcall(cfg80211_init);
 893
 894 static void cfg80211_exit(void)
 895 {
 896         debugfs_remove(ieee80211_debugfs_dir);
 897         nl80211_exit();
 898         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 899         wiphy_sysfs_exit();
 900         regulatory_exit();
 901         unregister_pernet_device(&cfg80211_pernet_ops);
 902 }
 903 module_exit(cfg80211_exit);