net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/if.h>
  10 #include <linux/module.h>
  11 #include <linux/err.h>
  12 #include <linux/list.h>
  13 #include <linux/slab.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/debugfs.h>
  16 #include <linux/notifier.h>
  17 #include <linux/device.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/sched.h>
  21 #include <net/genetlink.h>
  22 #include <net/cfg80211.h>
  23 #include "nl80211.h"
  24 #include "core.h"
  25 #include "sysfs.h"
  26 #include "debugfs.h"
  27 #include "wext-compat.h"
  28 #include "ethtool.h"
  29
  30 /* name for sysfs, %d is appended */
  31 #define PHY_NAME "phy"
  32
  33 MODULE_AUTHOR("Johannes Berg");
  34 MODULE_LICENSE("GPL");
  35 MODULE_DESCRIPTION("wireless configuration support");
  36
  37 /* RCU-protected (and cfg80211_mutex for writers) */
  38 LIST_HEAD(cfg80211_rdev_list);
  39 int cfg80211_rdev_list_generation;
  40
  41 DEFINE_MUTEX(cfg80211_mutex);
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* for the cleanup, scan and event works */
  47 struct workqueue_struct *cfg80211_wq;
  48
  49 static bool cfg80211_disable_40mhz_24ghz;
  50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                  "Disable 40MHz support in the 2.4GHz band");
  53
  54 /* requires cfg80211_mutex to be held! */
  55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  56 {
  57         struct cfg80211_registered_device *result = NULL, *rdev;
  58
  59         if (!wiphy_idx_valid(wiphy_idx))
  60                 return NULL;
  61
  62         assert_cfg80211_lock();
  63
  64         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  65                 if (rdev->wiphy_idx == wiphy_idx) {
  66                         result = rdev;
  67                         break;
  68                 }
  69         }
  70
  71         return result;
  72 }
  73
  74 int get_wiphy_idx(struct wiphy *wiphy)
  75 {
  76         struct cfg80211_registered_device *rdev;
  77         if (!wiphy)
  78                 return WIPHY_IDX_STALE;
  79         rdev = wiphy_to_dev(wiphy);
  80         return rdev->wiphy_idx;
  81 }
  82
  83 /* requires cfg80211_rdev_mutex to be held! */
  84 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  85 {
  86         struct cfg80211_registered_device *rdev;
  87
  88         if (!wiphy_idx_valid(wiphy_idx))
  89                 return NULL;
  90
  91         assert_cfg80211_lock();
  92
  93         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  94         if (!rdev)
  95                 return NULL;
  96         return &rdev->wiphy;
  97 }
  98
  99 /* requires cfg80211_mutex to be held! */
 100 struct cfg80211_registered_device *
 101 __cfg80211_rdev_from_info(struct genl_info *info)
 102 {
 103         int ifindex;
 104         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
 105         struct net_device *dev;
 106         int err = -EINVAL;
 107
 108         assert_cfg80211_lock();
 109
 110         if (info->attrs[NL80211_ATTR_WIPHY]) {
 111                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 112                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 113                 err = -ENODEV;
 114         }
 115
 116         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 117                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 118                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 119                 if (dev) {
 120                         if (dev->ieee80211_ptr)
 121                                 byifidx =
 122                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 123                         dev_put(dev);
 124                 }
 125                 err = -ENODEV;
 126         }
 127
 128         if (bywiphyidx && byifidx) {
 129                 if (bywiphyidx != byifidx)
 130                         return ERR_PTR(-EINVAL);
 131                 else
 132                         return bywiphyidx; /* == byifidx */
 133         }
 134         if (bywiphyidx)
 135                 return bywiphyidx;
 136
 137         if (byifidx)
 138                 return byifidx;
 139
 140         return ERR_PTR(err);
 141 }
 142
 143 struct cfg80211_registered_device *
 144 cfg80211_get_dev_from_info(struct genl_info *info)
 145 {
 146         struct cfg80211_registered_device *rdev;
 147
 148         mutex_lock(&cfg80211_mutex);
 149         rdev = __cfg80211_rdev_from_info(info);
 150
 151         /* if it is not an error we grab the lock on
 152          * it to assure it won't be going away while
 153          * we operate on it */
 154         if (!IS_ERR(rdev))
 155                 mutex_lock(&rdev->mtx);
 156
 157         mutex_unlock(&cfg80211_mutex);
 158
 159         return rdev;
 160 }
 161
 162 struct cfg80211_registered_device *
 163 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 164 {
 165         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 166         struct net_device *dev;
 167
 168         mutex_lock(&cfg80211_mutex);
 169         dev = dev_get_by_index(net, ifindex);
 170         if (!dev)
 171                 goto out;
 172         if (dev->ieee80211_ptr) {
 173                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 174                 mutex_lock(&rdev->mtx);
 175         } else
 176                 rdev = ERR_PTR(-ENODEV);
 177         dev_put(dev);
 178  out:
 179         mutex_unlock(&cfg80211_mutex);
 180         return rdev;
 181 }
 182
 183 /* requires cfg80211_mutex to be held */
 184 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 185                         char *newname)
 186 {
 187         struct cfg80211_registered_device *rdev2;
 188         int wiphy_idx, taken = -1, result, digits;
 189
 190         assert_cfg80211_lock();
 191
 192         /* prohibit calling the thing phy%d when %d is not its number */
 193         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 194         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 195                 /* count number of places needed to print wiphy_idx */
 196                 digits = 1;
 197                 while (wiphy_idx /= 10)
 198                         digits++;
 199                 /*
 200                  * deny the name if it is phy<idx> where <idx> is printed
 201                  * without leading zeroes. taken == strlen(newname) here
 202                  */
 203                 if (taken == strlen(PHY_NAME) + digits)
 204                         return -EINVAL;
 205         }
 206
 207
 208         /* Ignore nop renames */
 209         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 210                 return 0;
 211
 212         /* Ensure another device does not already have this name. */
 213         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 214                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 215                         return -EINVAL;
 216
 217         result = device_rename(&rdev->wiphy.dev, newname);
 218         if (result)
 219                 return result;
 220
 221         if (rdev->wiphy.debugfsdir &&
 222             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 223                             rdev->wiphy.debugfsdir,
 224                             rdev->wiphy.debugfsdir->d_parent,
 225                             newname))
 226                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 227
 228         nl80211_notify_dev_rename(rdev);
 229
 230         return 0;
 231 }
 232
 233 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 234                           struct net *net)
 235 {
 236         struct wireless_dev *wdev;
 237         int err = 0;
 238
 239         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 240                 return -EOPNOTSUPP;
 241
 242         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 243                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 244                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 245                 if (err)
 246                         break;
 247                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 248         }
 249
 250         if (err) {
 251                 /* failed -- clean up to old netns */
 252                 net = wiphy_net(&rdev->wiphy);
 253
 254                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 255                                                      list) {
 256                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 257                         err = dev_change_net_namespace(wdev->netdev, net,
 258                                                         "wlan%d");
 259                         WARN_ON(err);
 260                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 261                 }
 262
 263                 return err;
 264         }
 265
 266         wiphy_net_set(&rdev->wiphy, net);
 267
 268         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 269         WARN_ON(err);
 270
 271         return 0;
 272 }
 273
 274 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 275 {
 276         struct cfg80211_registered_device *rdev = data;
 277
 278         rdev->ops->rfkill_poll(&rdev->wiphy);
 279 }
 280
 281 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 282 {
 283         struct cfg80211_registered_device *rdev = data;
 284         struct wireless_dev *wdev;
 285
 286         if (!blocked)
 287                 return 0;
 288
 289         rtnl_lock();
 290         mutex_lock(&rdev->devlist_mtx);
 291
 292         list_for_each_entry(wdev, &rdev->netdev_list, list)
 293                 dev_close(wdev->netdev);
 294
 295         mutex_unlock(&rdev->devlist_mtx);
 296         rtnl_unlock();
 297
 298         return 0;
 299 }
 300
 301 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 302 {
 303         struct cfg80211_registered_device *rdev;
 304
 305         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 306         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 307 }
 308
 309 static void cfg80211_event_work(struct work_struct *work)
 310 {
 311         struct cfg80211_registered_device *rdev;
 312
 313         rdev = container_of(work, struct cfg80211_registered_device,
 314                             event_work);
 315
 316         rtnl_lock();
 317         cfg80211_lock_rdev(rdev);
 318
 319         cfg80211_process_rdev_events(rdev);
 320         cfg80211_unlock_rdev(rdev);
 321         rtnl_unlock();
 322 }
 323
 324 /* exported functions */
 325
 326 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 327 {
 328         static int wiphy_counter;
 329
 330         struct cfg80211_registered_device *rdev;
 331         int alloc_size;
 332
 333         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 334         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 335         WARN_ON(ops->connect && !ops->disconnect);
 336         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 337         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 338         WARN_ON(ops->add_station && !ops->del_station);
 339         WARN_ON(ops->add_mpath && !ops->del_mpath);
 340         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 341
 342         alloc_size = sizeof(*rdev) + sizeof_priv;
 343
 344         rdev = kzalloc(alloc_size, GFP_KERNEL);
 345         if (!rdev)
 346                 return NULL;
 347
 348         rdev->ops = ops;
 349
 350         mutex_lock(&cfg80211_mutex);
 351
 352         rdev->wiphy_idx = wiphy_counter++;
 353
 354         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 355                 wiphy_counter--;
 356                 mutex_unlock(&cfg80211_mutex);
 357                 /* ugh, wrapped! */
 358                 kfree(rdev);
 359                 return NULL;
 360         }
 361
 362         mutex_unlock(&cfg80211_mutex);
 363
 364         /* give it a proper name */
 365         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 366
 367         mutex_init(&rdev->mtx);
 368         mutex_init(&rdev->devlist_mtx);
 369         mutex_init(&rdev->sched_scan_mtx);
 370         INIT_LIST_HEAD(&rdev->netdev_list);
 371         spin_lock_init(&rdev->bss_lock);
 372         INIT_LIST_HEAD(&rdev->bss_list);
 373         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 374         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 375 #ifdef CONFIG_CFG80211_WEXT
 376         rdev->wiphy.wext = &cfg80211_wext_handler;
 377 #endif
 378
 379         device_initialize(&rdev->wiphy.dev);
 380         rdev->wiphy.dev.class = &ieee80211_class;
 381         rdev->wiphy.dev.platform_data = rdev;
 382
 383 #ifdef CONFIG_CFG80211_DEFAULT_PS
 384         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 385 #endif
 386
 387         wiphy_net_set(&rdev->wiphy, &init_net);
 388
 389         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 390         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 391                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 392                                    &rdev->rfkill_ops, rdev);
 393
 394         if (!rdev->rfkill) {
 395                 kfree(rdev);
 396                 return NULL;
 397         }
 398
 399         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 400         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 401         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 402
 403         init_waitqueue_head(&rdev->dev_wait);
 404
 405         /*
 406          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 407          * Fragmentation and RTS threshold are disabled by default with the
 408          * special -1 value.
 409          */
 410         rdev->wiphy.retry_short = 7;
 411         rdev->wiphy.retry_long = 4;
 412         rdev->wiphy.frag_threshold = (u32) -1;
 413         rdev->wiphy.rts_threshold = (u32) -1;
 414         rdev->wiphy.coverage_class = 0;
 415
 416         return &rdev->wiphy;
 417 }
 418 EXPORT_SYMBOL(wiphy_new);
 419
 420 static int wiphy_verify_combinations(struct wiphy *wiphy)
 421 {
 422         const struct ieee80211_iface_combination *c;
 423         int i, j;
 424
 425         /* If we have combinations enforce them */
 426         if (wiphy->n_iface_combinations)
 427                 wiphy->flags |= WIPHY_FLAG_ENFORCE_COMBINATIONS;
 428
 429         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 430                 u32 cnt = 0;
 431                 u16 all_iftypes = 0;
 432
 433                 c = &wiphy->iface_combinations[i];
 434
 435                 /* Combinations with just one interface aren't real */
 436                 if (WARN_ON(c->max_interfaces < 2))
 437                         return -EINVAL;
 438
 439                 /* Need at least one channel */
 440                 if (WARN_ON(!c->num_different_channels))
 441                         return -EINVAL;
 442
 443                 if (WARN_ON(!c->n_limits))
 444                         return -EINVAL;
 445
 446                 for (j = 0; j < c->n_limits; j++) {
 447                         u16 types = c->limits[j].types;
 448
 449                         /*
 450                          * interface types shouldn't overlap, this is
 451                          * used in cfg80211_can_change_interface()
 452                          */
 453                         if (WARN_ON(types & all_iftypes))
 454                                 return -EINVAL;
 455                         all_iftypes |= types;
 456
 457                         if (WARN_ON(!c->limits[j].max))
 458                                 return -EINVAL;
 459
 460                         /* Shouldn't list software iftypes in combinations! */
 461                         if (WARN_ON(wiphy->software_iftypes & types))
 462                                 return -EINVAL;
 463
 464                         cnt += c->limits[j].max;
 465                         /*
 466                          * Don't advertise an unsupported type
 467                          * in a combination.
 468                          */
 469                         if (WARN_ON((wiphy->interface_modes & types) != types))
 470                                 return -EINVAL;
 471                 }
 472
 473                 /* You can't even choose that many! */
 474                 if (WARN_ON(cnt < c->max_interfaces))
 475                         return -EINVAL;
 476         }
 477
 478         return 0;
 479 }
 480
 481 int wiphy_register(struct wiphy *wiphy)
 482 {
 483         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 484         int res;
 485         enum ieee80211_band band;
 486         struct ieee80211_supported_band *sband;
 487         bool have_band = false;
 488         int i;
 489         u16 ifmodes = wiphy->interface_modes;
 490
 491         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 492                 return -EINVAL;
 493
 494         if (WARN_ON(wiphy->addresses &&
 495                     !is_zero_ether_addr(wiphy->perm_addr) &&
 496                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 497                            ETH_ALEN)))
 498                 return -EINVAL;
 499
 500         if (wiphy->addresses)
 501                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 502
 503         /* sanity check ifmodes */
 504         WARN_ON(!ifmodes);
 505         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 506         if (WARN_ON(ifmodes != wiphy->interface_modes))
 507                 wiphy->interface_modes = ifmodes;
 508
 509         res = wiphy_verify_combinations(wiphy);
 510         if (res)
 511                 return res;
 512
 513         /* sanity check supported bands/channels */
 514         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 515                 sband = wiphy->bands[band];
 516                 if (!sband)
 517                         continue;
 518
 519                 sband->band = band;
 520
 521                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 522                         return -EINVAL;
 523
 524                 /*
 525                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 526                  * modify the sband's ht data even if the driver uses a
 527                  * global structure for that.
 528                  */
 529                 if (cfg80211_disable_40mhz_24ghz &&
 530                     band == IEEE80211_BAND_2GHZ &&
 531                     sband->ht_cap.ht_supported) {
 532                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 533                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 534                 }
 535
 536                 /*
 537                  * Since we use a u32 for rate bitmaps in
 538                  * ieee80211_get_response_rate, we cannot
 539                  * have more than 32 legacy rates.
 540                  */
 541                 if (WARN_ON(sband->n_bitrates > 32))
 542                         return -EINVAL;
 543
 544                 for (i = 0; i < sband->n_channels; i++) {
 545                         sband->channels[i].orig_flags =
 546                                 sband->channels[i].flags;
 547                         sband->channels[i].orig_mag =
 548                                 sband->channels[i].max_antenna_gain;
 549                         sband->channels[i].orig_mpwr =
 550                                 sband->channels[i].max_power;
 551                         sband->channels[i].band = band;
 552                 }
 553
 554                 have_band = true;
 555         }
 556
 557         if (!have_band) {
 558                 WARN_ON(1);
 559                 return -EINVAL;
 560         }
 561
 562         if (rdev->wiphy.wowlan.n_patterns) {
 563                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 564                             rdev->wiphy.wowlan.pattern_min_len >
 565                             rdev->wiphy.wowlan.pattern_max_len))
 566                         return -EINVAL;
 567         }
 568
 569         /* check and set up bitrates */
 570         ieee80211_set_bitrate_flags(wiphy);
 571
 572         mutex_lock(&cfg80211_mutex);
 573
 574         res = device_add(&rdev->wiphy.dev);
 575         if (res) {
 576                 mutex_unlock(&cfg80211_mutex);
 577                 return res;
 578         }
 579
 580         /* set up regulatory info */
 581         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 582
 583         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 584         cfg80211_rdev_list_generation++;
 585
 586         /* add to debugfs */
 587         rdev->wiphy.debugfsdir =
 588                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 589                                    ieee80211_debugfs_dir);
 590         if (IS_ERR(rdev->wiphy.debugfsdir))
 591                 rdev->wiphy.debugfsdir = NULL;
 592
 593         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 594                 struct regulatory_request request;
 595
 596                 request.wiphy_idx = get_wiphy_idx(wiphy);
 597                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 598                 request.alpha2[0] = '9';
 599                 request.alpha2[1] = '9';
 600
 601                 nl80211_send_reg_change_event(&request);
 602         }
 603
 604         cfg80211_debugfs_rdev_add(rdev);
 605         mutex_unlock(&cfg80211_mutex);
 606
 607         /*
 608          * due to a locking dependency this has to be outside of the
 609          * cfg80211_mutex lock
 610          */
 611         res = rfkill_register(rdev->rfkill);
 612         if (res)
 613                 goto out_rm_dev;
 614
 615         return 0;
 616
 617 out_rm_dev:
 618         device_del(&rdev->wiphy.dev);
 619         return res;
 620 }
 621 EXPORT_SYMBOL(wiphy_register);
 622
 623 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 624 {
 625         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 626
 627         if (!rdev->ops->rfkill_poll)
 628                 return;
 629         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 630         rfkill_resume_polling(rdev->rfkill);
 631 }
 632 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 633
 634 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 635 {
 636         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 637
 638         rfkill_pause_polling(rdev->rfkill);
 639 }
 640 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 641
 642 void wiphy_unregister(struct wiphy *wiphy)
 643 {
 644         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 645
 646         rfkill_unregister(rdev->rfkill);
 647
 648         /* protect the device list */
 649         mutex_lock(&cfg80211_mutex);
 650
 651         wait_event(rdev->dev_wait, ({
 652                 int __count;
 653                 mutex_lock(&rdev->devlist_mtx);
 654                 __count = rdev->opencount;
 655                 mutex_unlock(&rdev->devlist_mtx);
 656                 __count == 0;}));
 657
 658         mutex_lock(&rdev->devlist_mtx);
 659         BUG_ON(!list_empty(&rdev->netdev_list));
 660         mutex_unlock(&rdev->devlist_mtx);
 661
 662         /*
 663          * First remove the hardware from everywhere, this makes
 664          * it impossible to find from userspace.
 665          */
 666         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 667         list_del_rcu(&rdev->list);
 668         synchronize_rcu();
 669
 670         /*
 671          * Try to grab rdev->mtx. If a command is still in progress,
 672          * hopefully the driver will refuse it since it's tearing
 673          * down the device already. We wait for this command to complete
 674          * before unlinking the item from the list.
 675          * Note: as codified by the BUG_ON above we cannot get here if
 676          * a virtual interface is still present. Hence, we can only get
 677          * to lock contention here if userspace issues a command that
 678          * identified the hardware by wiphy index.
 679          */
 680         cfg80211_lock_rdev(rdev);
 681         /* nothing */
 682         cfg80211_unlock_rdev(rdev);
 683
 684         /* If this device got a regulatory hint tell core its
 685          * free to listen now to a new shiny device regulatory hint */
 686         reg_device_remove(wiphy);
 687
 688         cfg80211_rdev_list_generation++;
 689         device_del(&rdev->wiphy.dev);
 690
 691         mutex_unlock(&cfg80211_mutex);
 692
 693         flush_work(&rdev->scan_done_wk);
 694         cancel_work_sync(&rdev->conn_work);
 695         flush_work(&rdev->event_work);
 696 }
 697 EXPORT_SYMBOL(wiphy_unregister);
 698
 699 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 700 {
 701         struct cfg80211_internal_bss *scan, *tmp;
 702         rfkill_destroy(rdev->rfkill);
 703         mutex_destroy(&rdev->mtx);
 704         mutex_destroy(&rdev->devlist_mtx);
 705         mutex_destroy(&rdev->sched_scan_mtx);
 706         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 707                 cfg80211_put_bss(&scan->pub);
 708         cfg80211_rdev_free_wowlan(rdev);
 709         kfree(rdev);
 710 }
 711
 712 void wiphy_free(struct wiphy *wiphy)
 713 {
 714         put_device(&wiphy->dev);
 715 }
 716 EXPORT_SYMBOL(wiphy_free);
 717
 718 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 719 {
 720         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 721
 722         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 723                 schedule_work(&rdev->rfkill_sync);
 724 }
 725 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 726
 727 static void wdev_cleanup_work(struct work_struct *work)
 728 {
 729         struct wireless_dev *wdev;
 730         struct cfg80211_registered_device *rdev;
 731
 732         wdev = container_of(work, struct wireless_dev, cleanup_work);
 733         rdev = wiphy_to_dev(wdev->wiphy);
 734
 735         cfg80211_lock_rdev(rdev);
 736
 737         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 738                 rdev->scan_req->aborted = true;
 739                 ___cfg80211_scan_done(rdev, true);
 740         }
 741
 742         cfg80211_unlock_rdev(rdev);
 743
 744         mutex_lock(&rdev->sched_scan_mtx);
 745
 746         if (WARN_ON(rdev->sched_scan_req &&
 747                     rdev->sched_scan_req->dev == wdev->netdev)) {
 748                 __cfg80211_stop_sched_scan(rdev, false);
 749         }
 750
 751         mutex_unlock(&rdev->sched_scan_mtx);
 752
 753         mutex_lock(&rdev->devlist_mtx);
 754         rdev->opencount--;
 755         mutex_unlock(&rdev->devlist_mtx);
 756         wake_up(&rdev->dev_wait);
 757
 758         dev_put(wdev->netdev);
 759 }
 760
 761 static struct device_type wiphy_type = {
 762         .name   = "wlan",
 763 };
 764
 765 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 766                                          unsigned long state,
 767                                          void *ndev)
 768 {
 769         struct net_device *dev = ndev;
 770         struct wireless_dev *wdev = dev->ieee80211_ptr;
 771         struct cfg80211_registered_device *rdev;
 772         int ret;
 773
 774         if (!wdev)
 775                 return NOTIFY_DONE;
 776
 777         rdev = wiphy_to_dev(wdev->wiphy);
 778
 779         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 780
 781         switch (state) {
 782         case NETDEV_POST_INIT:
 783                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 784                 break;
 785         case NETDEV_REGISTER:
 786                 /*
 787                  * NB: cannot take rdev->mtx here because this may be
 788                  * called within code protected by it when interfaces
 789                  * are added with nl80211.
 790                  */
 791                 mutex_init(&wdev->mtx);
 792                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 793                 INIT_LIST_HEAD(&wdev->event_list);
 794                 spin_lock_init(&wdev->event_lock);
 795                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 796                 spin_lock_init(&wdev->mgmt_registrations_lock);
 797
 798                 mutex_lock(&rdev->devlist_mtx);
 799                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 800                 rdev->devlist_generation++;
 801                 /* can only change netns with wiphy */
 802                 dev->features |= NETIF_F_NETNS_LOCAL;
 803
 804                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 805                                       "phy80211")) {
 806                         pr_err("failed to add phy80211 symlink to netdev!\n");
 807                 }
 808                 wdev->netdev = dev;
 809                 wdev->sme_state = CFG80211_SME_IDLE;
 810                 mutex_unlock(&rdev->devlist_mtx);
 811 #ifdef CONFIG_CFG80211_WEXT
 812                 wdev->wext.default_key = -1;
 813                 wdev->wext.default_mgmt_key = -1;
 814                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 815 #endif
 816
 817                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 818                         wdev->ps = true;
 819                 else
 820                         wdev->ps = false;
 821                 /* allow mac80211 to determine the timeout */
 822                 wdev->ps_timeout = -1;
 823
 824                 if (!dev->ethtool_ops)
 825                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 826
 827                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 828                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 829                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 830                         dev->priv_flags |= IFF_DONT_BRIDGE;
 831                 break;
 832         case NETDEV_GOING_DOWN:
 833                 switch (wdev->iftype) {
 834                 case NL80211_IFTYPE_ADHOC:
 835                         cfg80211_leave_ibss(rdev, dev, true);
 836                         break;
 837                 case NL80211_IFTYPE_P2P_CLIENT:
 838                 case NL80211_IFTYPE_STATION:
 839                         mutex_lock(&rdev->sched_scan_mtx);
 840                         __cfg80211_stop_sched_scan(rdev, false);
 841                         mutex_unlock(&rdev->sched_scan_mtx);
 842
 843                         wdev_lock(wdev);
 844 #ifdef CONFIG_CFG80211_WEXT
 845                         kfree(wdev->wext.ie);
 846                         wdev->wext.ie = NULL;
 847                         wdev->wext.ie_len = 0;
 848                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 849 #endif
 850                         __cfg80211_disconnect(rdev, dev,
 851                                               WLAN_REASON_DEAUTH_LEAVING, true);
 852                         cfg80211_mlme_down(rdev, dev);
 853                         wdev_unlock(wdev);
 854                         break;
 855                 case NL80211_IFTYPE_MESH_POINT:
 856                         cfg80211_leave_mesh(rdev, dev);
 857                         break;
 858                 default:
 859                         break;
 860                 }
 861                 wdev->beacon_interval = 0;
 862                 break;
 863         case NETDEV_DOWN:
 864                 dev_hold(dev);
 865                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 866                 break;
 867         case NETDEV_UP:
 868                 /*
 869                  * If we have a really quick DOWN/UP succession we may
 870                  * have this work still pending ... cancel it and see
 871                  * if it was pending, in which case we need to account
 872                  * for some of the work it would have done.
 873                  */
 874                 if (cancel_work_sync(&wdev->cleanup_work)) {
 875                         mutex_lock(&rdev->devlist_mtx);
 876                         rdev->opencount--;
 877                         mutex_unlock(&rdev->devlist_mtx);
 878                         dev_put(dev);
 879                 }
 880                 cfg80211_lock_rdev(rdev);
 881                 mutex_lock(&rdev->devlist_mtx);
 882                 wdev_lock(wdev);
 883                 switch (wdev->iftype) {
 884 #ifdef CONFIG_CFG80211_WEXT
 885                 case NL80211_IFTYPE_ADHOC:
 886                         cfg80211_ibss_wext_join(rdev, wdev);
 887                         break;
 888                 case NL80211_IFTYPE_STATION:
 889                         cfg80211_mgd_wext_connect(rdev, wdev);
 890                         break;
 891 #endif
 892 #ifdef CONFIG_MAC80211_MESH
 893                 case NL80211_IFTYPE_MESH_POINT:
 894                         {
 895                                 /* backward compat code... */
 896                                 struct mesh_setup setup;
 897                                 memcpy(&setup, &default_mesh_setup,
 898                                                 sizeof(setup));
 899                                  /* back compat only needed for mesh_id */
 900                                 setup.mesh_id = wdev->ssid;
 901                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 902                                 if (wdev->mesh_id_up_len)
 903                                         __cfg80211_join_mesh(rdev, dev,
 904                                                         &setup,
 905                                                         &default_mesh_config);
 906                                 break;
 907                         }
 908 #endif
 909                 default:
 910                         break;
 911                 }
 912                 wdev_unlock(wdev);
 913                 rdev->opencount++;
 914                 mutex_unlock(&rdev->devlist_mtx);
 915                 cfg80211_unlock_rdev(rdev);
 916
 917                 /*
 918                  * Configure power management to the driver here so that its
 919                  * correctly set also after interface type changes etc.
 920                  */
 921                 if (wdev->iftype == NL80211_IFTYPE_STATION &&
 922                     rdev->ops->set_power_mgmt)
 923                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 924                                                       wdev->ps,
 925                                                       wdev->ps_timeout)) {
 926                                 /* assume this means it's off */
 927                                 wdev->ps = false;
 928                         }
 929                 break;
 930         case NETDEV_UNREGISTER:
 931                 /*
 932                  * NB: cannot take rdev->mtx here because this may be
 933                  * called within code protected by it when interfaces
 934                  * are removed with nl80211.
 935                  */
 936                 mutex_lock(&rdev->devlist_mtx);
 937                 /*
 938                  * It is possible to get NETDEV_UNREGISTER
 939                  * multiple times. To detect that, check
 940                  * that the interface is still on the list
 941                  * of registered interfaces, and only then
 942                  * remove and clean it up.
 943                  */
 944                 if (!list_empty(&wdev->list)) {
 945                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 946                         list_del_rcu(&wdev->list);
 947                         rdev->devlist_generation++;
 948                         cfg80211_mlme_purge_registrations(wdev);
 949 #ifdef CONFIG_CFG80211_WEXT
 950                         kfree(wdev->wext.keys);
 951 #endif
 952                 }
 953                 mutex_unlock(&rdev->devlist_mtx);
 954                 /*
 955                  * synchronise (so that we won't find this netdev
 956                  * from other code any more) and then clear the list
 957                  * head so that the above code can safely check for
 958                  * !list_empty() to avoid double-cleanup.
 959                  */
 960                 synchronize_rcu();
 961                 INIT_LIST_HEAD(&wdev->list);
 962                 break;
 963         case NETDEV_PRE_UP:
 964                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 965                         return notifier_from_errno(-EOPNOTSUPP);
 966                 if (rfkill_blocked(rdev->rfkill))
 967                         return notifier_from_errno(-ERFKILL);
 968                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 969                 if (ret)
 970                         return notifier_from_errno(ret);
 971                 break;
 972         }
 973
 974         return NOTIFY_DONE;
 975 }
 976
 977 static struct notifier_block cfg80211_netdev_notifier = {
 978         .notifier_call = cfg80211_netdev_notifier_call,
 979 };
 980
 981 static void __net_exit cfg80211_pernet_exit(struct net *net)
 982 {
 983         struct cfg80211_registered_device *rdev;
 984
 985         rtnl_lock();
 986         mutex_lock(&cfg80211_mutex);
 987         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 988                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 989                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 990         }
 991         mutex_unlock(&cfg80211_mutex);
 992         rtnl_unlock();
 993 }
 994
 995 static struct pernet_operations cfg80211_pernet_ops = {
 996         .exit = cfg80211_pernet_exit,
 997 };
 998
 999 static int __init cfg80211_init(void)
1000 {
1001         int err;
1002
1003         err = register_pernet_device(&cfg80211_pernet_ops);
1004         if (err)
1005                 goto out_fail_pernet;
1006
1007         err = wiphy_sysfs_init();
1008         if (err)
1009                 goto out_fail_sysfs;
1010
1011         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1012         if (err)
1013                 goto out_fail_notifier;
1014
1015         err = nl80211_init();
1016         if (err)
1017                 goto out_fail_nl80211;
1018
1019         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1020
1021         err = regulatory_init();
1022         if (err)
1023                 goto out_fail_reg;
1024
1025         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1026         if (!cfg80211_wq)
1027                 goto out_fail_wq;
1028
1029         return 0;
1030
1031 out_fail_wq:
1032         regulatory_exit();
1033 out_fail_reg:
1034         debugfs_remove(ieee80211_debugfs_dir);
1035 out_fail_nl80211:
1036         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1037 out_fail_notifier:
1038         wiphy_sysfs_exit();
1039 out_fail_sysfs:
1040         unregister_pernet_device(&cfg80211_pernet_ops);
1041 out_fail_pernet:
1042         return err;
1043 }
1044 subsys_initcall(cfg80211_init);
1045
1046 static void __exit cfg80211_exit(void)
1047 {
1048         debugfs_remove(ieee80211_debugfs_dir);
1049         nl80211_exit();
1050         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1051         wiphy_sysfs_exit();
1052         regulatory_exit();
1053         unregister_pernet_device(&cfg80211_pernet_ops);
1054         destroy_workqueue(cfg80211_wq);
1055 }
1056 module_exit(cfg80211_exit);