Pileus Git - ~andy/linux/blob - 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 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37
  38 /* RCU-protected (and cfg80211_mutex for writers) */
  39 LIST_HEAD(cfg80211_rdev_list);
  40 int cfg80211_rdev_list_generation;
  41
  42 DEFINE_MUTEX(cfg80211_mutex);
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 /* requires cfg80211_mutex to be held! */
  56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  57 {
  58         struct cfg80211_registered_device *result = NULL, *rdev;
  59
  60         assert_cfg80211_lock();
  61
  62         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  63                 if (rdev->wiphy_idx == wiphy_idx) {
  64                         result = rdev;
  65                         break;
  66                 }
  67         }
  68
  69         return result;
  70 }
  71
  72 int get_wiphy_idx(struct wiphy *wiphy)
  73 {
  74         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  75
  76         return rdev->wiphy_idx;
  77 }
  78
  79 /* requires cfg80211_rdev_mutex to be held! */
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         assert_cfg80211_lock();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 struct cfg80211_registered_device *
  93 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
  94 {
  95         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
  96         struct net_device *dev;
  97
  98         mutex_lock(&cfg80211_mutex);
  99         dev = dev_get_by_index(net, ifindex);
 100         if (!dev)
 101                 goto out;
 102         if (dev->ieee80211_ptr) {
 103                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 104                 mutex_lock(&rdev->mtx);
 105         } else
 106                 rdev = ERR_PTR(-ENODEV);
 107         dev_put(dev);
 108  out:
 109         mutex_unlock(&cfg80211_mutex);
 110         return rdev;
 111 }
 112
 113 /* requires cfg80211_mutex to be held */
 114 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 115                         char *newname)
 116 {
 117         struct cfg80211_registered_device *rdev2;
 118         int wiphy_idx, taken = -1, result, digits;
 119
 120         assert_cfg80211_lock();
 121
 122         /* prohibit calling the thing phy%d when %d is not its number */
 123         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 124         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 125                 /* count number of places needed to print wiphy_idx */
 126                 digits = 1;
 127                 while (wiphy_idx /= 10)
 128                         digits++;
 129                 /*
 130                  * deny the name if it is phy<idx> where <idx> is printed
 131                  * without leading zeroes. taken == strlen(newname) here
 132                  */
 133                 if (taken == strlen(PHY_NAME) + digits)
 134                         return -EINVAL;
 135         }
 136
 137
 138         /* Ignore nop renames */
 139         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 140                 return 0;
 141
 142         /* Ensure another device does not already have this name. */
 143         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 144                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 145                         return -EINVAL;
 146
 147         result = device_rename(&rdev->wiphy.dev, newname);
 148         if (result)
 149                 return result;
 150
 151         if (rdev->wiphy.debugfsdir &&
 152             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 153                             rdev->wiphy.debugfsdir,
 154                             rdev->wiphy.debugfsdir->d_parent,
 155                             newname))
 156                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 157
 158         nl80211_notify_dev_rename(rdev);
 159
 160         return 0;
 161 }
 162
 163 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 164                           struct net *net)
 165 {
 166         struct wireless_dev *wdev;
 167         int err = 0;
 168
 169         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 170                 return -EOPNOTSUPP;
 171
 172         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 173                 if (!wdev->netdev)
 174                         continue;
 175                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 176                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 177                 if (err)
 178                         break;
 179                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 180         }
 181
 182         if (err) {
 183                 /* failed -- clean up to old netns */
 184                 net = wiphy_net(&rdev->wiphy);
 185
 186                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 187                                                      list) {
 188                         if (!wdev->netdev)
 189                                 continue;
 190                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 191                         err = dev_change_net_namespace(wdev->netdev, net,
 192                                                         "wlan%d");
 193                         WARN_ON(err);
 194                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 195                 }
 196
 197                 return err;
 198         }
 199
 200         wiphy_net_set(&rdev->wiphy, net);
 201
 202         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 203         WARN_ON(err);
 204
 205         return 0;
 206 }
 207
 208 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 209 {
 210         struct cfg80211_registered_device *rdev = data;
 211
 212         rdev_rfkill_poll(rdev);
 213 }
 214
 215 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 216 {
 217         struct cfg80211_registered_device *rdev = data;
 218         struct wireless_dev *wdev;
 219
 220         if (!blocked)
 221                 return 0;
 222
 223         rtnl_lock();
 224         mutex_lock(&rdev->devlist_mtx);
 225
 226         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 227                 if (wdev->netdev) {
 228                         dev_close(wdev->netdev);
 229                         continue;
 230                 }
 231                 /* otherwise, check iftype */
 232                 switch (wdev->iftype) {
 233                 case NL80211_IFTYPE_P2P_DEVICE:
 234                         if (!wdev->p2p_started)
 235                                 break;
 236                         rdev_stop_p2p_device(rdev, wdev);
 237                         wdev->p2p_started = false;
 238                         rdev->opencount--;
 239                         break;
 240                 default:
 241                         break;
 242                 }
 243         }
 244
 245         mutex_unlock(&rdev->devlist_mtx);
 246         rtnl_unlock();
 247
 248         return 0;
 249 }
 250
 251 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 252 {
 253         struct cfg80211_registered_device *rdev;
 254
 255         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 256         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 257 }
 258
 259 static void cfg80211_event_work(struct work_struct *work)
 260 {
 261         struct cfg80211_registered_device *rdev;
 262
 263         rdev = container_of(work, struct cfg80211_registered_device,
 264                             event_work);
 265
 266         rtnl_lock();
 267         cfg80211_lock_rdev(rdev);
 268
 269         cfg80211_process_rdev_events(rdev);
 270         cfg80211_unlock_rdev(rdev);
 271         rtnl_unlock();
 272 }
 273
 274 /* exported functions */
 275
 276 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 277 {
 278         static int wiphy_counter;
 279
 280         struct cfg80211_registered_device *rdev;
 281         int alloc_size;
 282
 283         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 284         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 285         WARN_ON(ops->connect && !ops->disconnect);
 286         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 287         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 288         WARN_ON(ops->add_station && !ops->del_station);
 289         WARN_ON(ops->add_mpath && !ops->del_mpath);
 290         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 291
 292         alloc_size = sizeof(*rdev) + sizeof_priv;
 293
 294         rdev = kzalloc(alloc_size, GFP_KERNEL);
 295         if (!rdev)
 296                 return NULL;
 297
 298         rdev->ops = ops;
 299
 300         mutex_lock(&cfg80211_mutex);
 301
 302         rdev->wiphy_idx = wiphy_counter++;
 303
 304         if (unlikely(rdev->wiphy_idx < 0)) {
 305                 wiphy_counter--;
 306                 mutex_unlock(&cfg80211_mutex);
 307                 /* ugh, wrapped! */
 308                 kfree(rdev);
 309                 return NULL;
 310         }
 311
 312         mutex_unlock(&cfg80211_mutex);
 313
 314         /* give it a proper name */
 315         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 316
 317         mutex_init(&rdev->mtx);
 318         mutex_init(&rdev->devlist_mtx);
 319         mutex_init(&rdev->sched_scan_mtx);
 320         INIT_LIST_HEAD(&rdev->wdev_list);
 321         INIT_LIST_HEAD(&rdev->beacon_registrations);
 322         spin_lock_init(&rdev->beacon_registrations_lock);
 323         spin_lock_init(&rdev->bss_lock);
 324         INIT_LIST_HEAD(&rdev->bss_list);
 325         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 326         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 327 #ifdef CONFIG_CFG80211_WEXT
 328         rdev->wiphy.wext = &cfg80211_wext_handler;
 329 #endif
 330
 331         device_initialize(&rdev->wiphy.dev);
 332         rdev->wiphy.dev.class = &ieee80211_class;
 333         rdev->wiphy.dev.platform_data = rdev;
 334
 335 #ifdef CONFIG_CFG80211_DEFAULT_PS
 336         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 337 #endif
 338
 339         wiphy_net_set(&rdev->wiphy, &init_net);
 340
 341         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 342         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 343                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 344                                    &rdev->rfkill_ops, rdev);
 345
 346         if (!rdev->rfkill) {
 347                 kfree(rdev);
 348                 return NULL;
 349         }
 350
 351         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 352         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 353         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 354
 355         init_waitqueue_head(&rdev->dev_wait);
 356
 357         /*
 358          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 359          * Fragmentation and RTS threshold are disabled by default with the
 360          * special -1 value.
 361          */
 362         rdev->wiphy.retry_short = 7;
 363         rdev->wiphy.retry_long = 4;
 364         rdev->wiphy.frag_threshold = (u32) -1;
 365         rdev->wiphy.rts_threshold = (u32) -1;
 366         rdev->wiphy.coverage_class = 0;
 367
 368         rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
 369
 370         return &rdev->wiphy;
 371 }
 372 EXPORT_SYMBOL(wiphy_new);
 373
 374 static int wiphy_verify_combinations(struct wiphy *wiphy)
 375 {
 376         const struct ieee80211_iface_combination *c;
 377         int i, j;
 378
 379         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 380                 u32 cnt = 0;
 381                 u16 all_iftypes = 0;
 382
 383                 c = &wiphy->iface_combinations[i];
 384
 385                 /*
 386                  * Combinations with just one interface aren't real,
 387                  * however we make an exception for DFS.
 388                  */
 389                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 390                         return -EINVAL;
 391
 392                 /* Need at least one channel */
 393                 if (WARN_ON(!c->num_different_channels))
 394                         return -EINVAL;
 395
 396                 /*
 397                  * Put a sane limit on maximum number of different
 398                  * channels to simplify channel accounting code.
 399                  */
 400                 if (WARN_ON(c->num_different_channels >
 401                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 402                         return -EINVAL;
 403
 404                 /* DFS only works on one channel. */
 405                 if (WARN_ON(c->radar_detect_widths &&
 406                             (c->num_different_channels > 1)))
 407                         return -EINVAL;
 408
 409                 if (WARN_ON(!c->n_limits))
 410                         return -EINVAL;
 411
 412                 for (j = 0; j < c->n_limits; j++) {
 413                         u16 types = c->limits[j].types;
 414
 415                         /*
 416                          * interface types shouldn't overlap, this is
 417                          * used in cfg80211_can_change_interface()
 418                          */
 419                         if (WARN_ON(types & all_iftypes))
 420                                 return -EINVAL;
 421                         all_iftypes |= types;
 422
 423                         if (WARN_ON(!c->limits[j].max))
 424                                 return -EINVAL;
 425
 426                         /* Shouldn't list software iftypes in combinations! */
 427                         if (WARN_ON(wiphy->software_iftypes & types))
 428                                 return -EINVAL;
 429
 430                         /* Only a single P2P_DEVICE can be allowed */
 431                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 432                                     c->limits[j].max > 1))
 433                                 return -EINVAL;
 434
 435                         cnt += c->limits[j].max;
 436                         /*
 437                          * Don't advertise an unsupported type
 438                          * in a combination.
 439                          */
 440                         if (WARN_ON((wiphy->interface_modes & types) != types))
 441                                 return -EINVAL;
 442                 }
 443
 444                 /* You can't even choose that many! */
 445                 if (WARN_ON(cnt < c->max_interfaces))
 446                         return -EINVAL;
 447         }
 448
 449         return 0;
 450 }
 451
 452 int wiphy_register(struct wiphy *wiphy)
 453 {
 454         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 455         int res;
 456         enum ieee80211_band band;
 457         struct ieee80211_supported_band *sband;
 458         bool have_band = false;
 459         int i;
 460         u16 ifmodes = wiphy->interface_modes;
 461
 462 #ifdef CONFIG_PM
 463         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 464                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 465                 return -EINVAL;
 466 #endif
 467
 468         if (WARN_ON(wiphy->ap_sme_capa &&
 469                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 470                 return -EINVAL;
 471
 472         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 473                 return -EINVAL;
 474
 475         if (WARN_ON(wiphy->addresses &&
 476                     !is_zero_ether_addr(wiphy->perm_addr) &&
 477                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 478                            ETH_ALEN)))
 479                 return -EINVAL;
 480
 481         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 482                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 483                      !rdev->ops->set_mac_acl)))
 484                 return -EINVAL;
 485
 486         if (wiphy->addresses)
 487                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 488
 489         /* sanity check ifmodes */
 490         WARN_ON(!ifmodes);
 491         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 492         if (WARN_ON(ifmodes != wiphy->interface_modes))
 493                 wiphy->interface_modes = ifmodes;
 494
 495         res = wiphy_verify_combinations(wiphy);
 496         if (res)
 497                 return res;
 498
 499         /* sanity check supported bands/channels */
 500         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 501                 sband = wiphy->bands[band];
 502                 if (!sband)
 503                         continue;
 504
 505                 sband->band = band;
 506                 if (WARN_ON(!sband->n_channels))
 507                         return -EINVAL;
 508                 /*
 509                  * on 60gHz band, there are no legacy rates, so
 510                  * n_bitrates is 0
 511                  */
 512                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 513                             !sband->n_bitrates))
 514                         return -EINVAL;
 515
 516                 /*
 517                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 518                  * modify the sband's ht data even if the driver uses a
 519                  * global structure for that.
 520                  */
 521                 if (cfg80211_disable_40mhz_24ghz &&
 522                     band == IEEE80211_BAND_2GHZ &&
 523                     sband->ht_cap.ht_supported) {
 524                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 525                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 526                 }
 527
 528                 /*
 529                  * Since we use a u32 for rate bitmaps in
 530                  * ieee80211_get_response_rate, we cannot
 531                  * have more than 32 legacy rates.
 532                  */
 533                 if (WARN_ON(sband->n_bitrates > 32))
 534                         return -EINVAL;
 535
 536                 for (i = 0; i < sband->n_channels; i++) {
 537                         sband->channels[i].orig_flags =
 538                                 sband->channels[i].flags;
 539                         sband->channels[i].orig_mag = INT_MAX;
 540                         sband->channels[i].orig_mpwr =
 541                                 sband->channels[i].max_power;
 542                         sband->channels[i].band = band;
 543                 }
 544
 545                 have_band = true;
 546         }
 547
 548         if (!have_band) {
 549                 WARN_ON(1);
 550                 return -EINVAL;
 551         }
 552
 553 #ifdef CONFIG_PM
 554         if (rdev->wiphy.wowlan.n_patterns) {
 555                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 556                             rdev->wiphy.wowlan.pattern_min_len >
 557                             rdev->wiphy.wowlan.pattern_max_len))
 558                         return -EINVAL;
 559         }
 560 #endif
 561
 562         /* check and set up bitrates */
 563         ieee80211_set_bitrate_flags(wiphy);
 564
 565         mutex_lock(&cfg80211_mutex);
 566
 567         res = device_add(&rdev->wiphy.dev);
 568         if (res) {
 569                 mutex_unlock(&cfg80211_mutex);
 570                 return res;
 571         }
 572
 573         /* set up regulatory info */
 574         wiphy_regulatory_register(wiphy);
 575
 576         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 577         cfg80211_rdev_list_generation++;
 578
 579         /* add to debugfs */
 580         rdev->wiphy.debugfsdir =
 581                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 582                                    ieee80211_debugfs_dir);
 583         if (IS_ERR(rdev->wiphy.debugfsdir))
 584                 rdev->wiphy.debugfsdir = NULL;
 585
 586         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 587                 struct regulatory_request request;
 588
 589                 request.wiphy_idx = get_wiphy_idx(wiphy);
 590                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 591                 request.alpha2[0] = '9';
 592                 request.alpha2[1] = '9';
 593
 594                 nl80211_send_reg_change_event(&request);
 595         }
 596
 597         cfg80211_debugfs_rdev_add(rdev);
 598         mutex_unlock(&cfg80211_mutex);
 599
 600         /*
 601          * due to a locking dependency this has to be outside of the
 602          * cfg80211_mutex lock
 603          */
 604         res = rfkill_register(rdev->rfkill);
 605         if (res)
 606                 goto out_rm_dev;
 607
 608         rtnl_lock();
 609         rdev->wiphy.registered = true;
 610         rtnl_unlock();
 611         return 0;
 612
 613 out_rm_dev:
 614         device_del(&rdev->wiphy.dev);
 615         return res;
 616 }
 617 EXPORT_SYMBOL(wiphy_register);
 618
 619 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 620 {
 621         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 622
 623         if (!rdev->ops->rfkill_poll)
 624                 return;
 625         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 626         rfkill_resume_polling(rdev->rfkill);
 627 }
 628 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 629
 630 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 631 {
 632         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 633
 634         rfkill_pause_polling(rdev->rfkill);
 635 }
 636 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 637
 638 void wiphy_unregister(struct wiphy *wiphy)
 639 {
 640         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 641
 642         rtnl_lock();
 643         rdev->wiphy.registered = false;
 644         rtnl_unlock();
 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->wdev_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         /*
 685          * If this device got a regulatory hint tell core its
 686          * free to listen now to a new shiny device regulatory hint
 687          */
 688         wiphy_regulatory_deregister(wiphy);
 689
 690         cfg80211_rdev_list_generation++;
 691         device_del(&rdev->wiphy.dev);
 692
 693         mutex_unlock(&cfg80211_mutex);
 694
 695         flush_work(&rdev->scan_done_wk);
 696         cancel_work_sync(&rdev->conn_work);
 697         flush_work(&rdev->event_work);
 698
 699         if (rdev->wowlan && rdev->ops->set_wakeup)
 700                 rdev_set_wakeup(rdev, false);
 701         cfg80211_rdev_free_wowlan(rdev);
 702 }
 703 EXPORT_SYMBOL(wiphy_unregister);
 704
 705 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 706 {
 707         struct cfg80211_internal_bss *scan, *tmp;
 708         struct cfg80211_beacon_registration *reg, *treg;
 709         rfkill_destroy(rdev->rfkill);
 710         mutex_destroy(&rdev->mtx);
 711         mutex_destroy(&rdev->devlist_mtx);
 712         mutex_destroy(&rdev->sched_scan_mtx);
 713         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 714                 list_del(&reg->list);
 715                 kfree(reg);
 716         }
 717         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 718                 cfg80211_put_bss(&scan->pub);
 719         kfree(rdev);
 720 }
 721
 722 void wiphy_free(struct wiphy *wiphy)
 723 {
 724         put_device(&wiphy->dev);
 725 }
 726 EXPORT_SYMBOL(wiphy_free);
 727
 728 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 729 {
 730         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 731
 732         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 733                 schedule_work(&rdev->rfkill_sync);
 734 }
 735 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 736
 737 static void wdev_cleanup_work(struct work_struct *work)
 738 {
 739         struct wireless_dev *wdev;
 740         struct cfg80211_registered_device *rdev;
 741
 742         wdev = container_of(work, struct wireless_dev, cleanup_work);
 743         rdev = wiphy_to_dev(wdev->wiphy);
 744
 745         cfg80211_lock_rdev(rdev);
 746
 747         if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
 748                 rdev->scan_req->aborted = true;
 749                 ___cfg80211_scan_done(rdev, true);
 750         }
 751
 752         cfg80211_unlock_rdev(rdev);
 753
 754         mutex_lock(&rdev->sched_scan_mtx);
 755
 756         if (WARN_ON(rdev->sched_scan_req &&
 757                     rdev->sched_scan_req->dev == wdev->netdev)) {
 758                 __cfg80211_stop_sched_scan(rdev, false);
 759         }
 760
 761         mutex_unlock(&rdev->sched_scan_mtx);
 762
 763         mutex_lock(&rdev->devlist_mtx);
 764         rdev->opencount--;
 765         mutex_unlock(&rdev->devlist_mtx);
 766         wake_up(&rdev->dev_wait);
 767
 768         dev_put(wdev->netdev);
 769 }
 770
 771 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 772 {
 773         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 774
 775         ASSERT_RTNL();
 776
 777         if (WARN_ON(wdev->netdev))
 778                 return;
 779
 780         mutex_lock(&rdev->devlist_mtx);
 781         list_del_rcu(&wdev->list);
 782         rdev->devlist_generation++;
 783
 784         switch (wdev->iftype) {
 785         case NL80211_IFTYPE_P2P_DEVICE:
 786                 if (!wdev->p2p_started)
 787                         break;
 788                 rdev_stop_p2p_device(rdev, wdev);
 789                 wdev->p2p_started = false;
 790                 rdev->opencount--;
 791                 break;
 792         default:
 793                 WARN_ON_ONCE(1);
 794                 break;
 795         }
 796         mutex_unlock(&rdev->devlist_mtx);
 797 }
 798 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 799
 800 static struct device_type wiphy_type = {
 801         .name   = "wlan",
 802 };
 803
 804 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 805                                enum nl80211_iftype iftype, int num)
 806 {
 807         ASSERT_RTNL();
 808
 809         rdev->num_running_ifaces += num;
 810         if (iftype == NL80211_IFTYPE_MONITOR)
 811                 rdev->num_running_monitor_ifaces += num;
 812 }
 813
 814 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 815                                          unsigned long state,
 816                                          void *ndev)
 817 {
 818         struct net_device *dev = ndev;
 819         struct wireless_dev *wdev = dev->ieee80211_ptr;
 820         struct cfg80211_registered_device *rdev;
 821         int ret;
 822
 823         if (!wdev)
 824                 return NOTIFY_DONE;
 825
 826         rdev = wiphy_to_dev(wdev->wiphy);
 827
 828         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 829
 830         switch (state) {
 831         case NETDEV_POST_INIT:
 832                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 833                 break;
 834         case NETDEV_REGISTER:
 835                 /*
 836                  * NB: cannot take rdev->mtx here because this may be
 837                  * called within code protected by it when interfaces
 838                  * are added with nl80211.
 839                  */
 840                 mutex_init(&wdev->mtx);
 841                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 842                 INIT_LIST_HEAD(&wdev->event_list);
 843                 spin_lock_init(&wdev->event_lock);
 844                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 845                 spin_lock_init(&wdev->mgmt_registrations_lock);
 846
 847                 mutex_lock(&rdev->devlist_mtx);
 848                 wdev->identifier = ++rdev->wdev_id;
 849                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 850                 rdev->devlist_generation++;
 851                 /* can only change netns with wiphy */
 852                 dev->features |= NETIF_F_NETNS_LOCAL;
 853
 854                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 855                                       "phy80211")) {
 856                         pr_err("failed to add phy80211 symlink to netdev!\n");
 857                 }
 858                 wdev->netdev = dev;
 859                 wdev->sme_state = CFG80211_SME_IDLE;
 860                 mutex_unlock(&rdev->devlist_mtx);
 861 #ifdef CONFIG_CFG80211_WEXT
 862                 wdev->wext.default_key = -1;
 863                 wdev->wext.default_mgmt_key = -1;
 864                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 865 #endif
 866
 867                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 868                         wdev->ps = true;
 869                 else
 870                         wdev->ps = false;
 871                 /* allow mac80211 to determine the timeout */
 872                 wdev->ps_timeout = -1;
 873
 874                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 875
 876                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 877                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 878                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 879                         dev->priv_flags |= IFF_DONT_BRIDGE;
 880                 break;
 881         case NETDEV_GOING_DOWN:
 882                 switch (wdev->iftype) {
 883                 case NL80211_IFTYPE_ADHOC:
 884                         cfg80211_leave_ibss(rdev, dev, true);
 885                         break;
 886                 case NL80211_IFTYPE_P2P_CLIENT:
 887                 case NL80211_IFTYPE_STATION:
 888                         mutex_lock(&rdev->sched_scan_mtx);
 889                         __cfg80211_stop_sched_scan(rdev, false);
 890                         mutex_unlock(&rdev->sched_scan_mtx);
 891
 892                         wdev_lock(wdev);
 893 #ifdef CONFIG_CFG80211_WEXT
 894                         kfree(wdev->wext.ie);
 895                         wdev->wext.ie = NULL;
 896                         wdev->wext.ie_len = 0;
 897                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 898 #endif
 899                         __cfg80211_disconnect(rdev, dev,
 900                                               WLAN_REASON_DEAUTH_LEAVING, true);
 901                         cfg80211_mlme_down(rdev, dev);
 902                         wdev_unlock(wdev);
 903                         break;
 904                 case NL80211_IFTYPE_MESH_POINT:
 905                         cfg80211_leave_mesh(rdev, dev);
 906                         break;
 907                 case NL80211_IFTYPE_AP:
 908                         cfg80211_stop_ap(rdev, dev);
 909                         break;
 910                 default:
 911                         break;
 912                 }
 913                 wdev->beacon_interval = 0;
 914                 break;
 915         case NETDEV_DOWN:
 916                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 917                 dev_hold(dev);
 918                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 919                 break;
 920         case NETDEV_UP:
 921                 /*
 922                  * If we have a really quick DOWN/UP succession we may
 923                  * have this work still pending ... cancel it and see
 924                  * if it was pending, in which case we need to account
 925                  * for some of the work it would have done.
 926                  */
 927                 if (cancel_work_sync(&wdev->cleanup_work)) {
 928                         mutex_lock(&rdev->devlist_mtx);
 929                         rdev->opencount--;
 930                         mutex_unlock(&rdev->devlist_mtx);
 931                         dev_put(dev);
 932                 }
 933                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 934                 cfg80211_lock_rdev(rdev);
 935                 mutex_lock(&rdev->devlist_mtx);
 936                 wdev_lock(wdev);
 937                 switch (wdev->iftype) {
 938 #ifdef CONFIG_CFG80211_WEXT
 939                 case NL80211_IFTYPE_ADHOC:
 940                         cfg80211_ibss_wext_join(rdev, wdev);
 941                         break;
 942                 case NL80211_IFTYPE_STATION:
 943                         cfg80211_mgd_wext_connect(rdev, wdev);
 944                         break;
 945 #endif
 946 #ifdef CONFIG_MAC80211_MESH
 947                 case NL80211_IFTYPE_MESH_POINT:
 948                         {
 949                                 /* backward compat code... */
 950                                 struct mesh_setup setup;
 951                                 memcpy(&setup, &default_mesh_setup,
 952                                                 sizeof(setup));
 953                                  /* back compat only needed for mesh_id */
 954                                 setup.mesh_id = wdev->ssid;
 955                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 956                                 if (wdev->mesh_id_up_len)
 957                                         __cfg80211_join_mesh(rdev, dev,
 958                                                         &setup,
 959                                                         &default_mesh_config);
 960                                 break;
 961                         }
 962 #endif
 963                 default:
 964                         break;
 965                 }
 966                 wdev_unlock(wdev);
 967                 rdev->opencount++;
 968                 mutex_unlock(&rdev->devlist_mtx);
 969                 cfg80211_unlock_rdev(rdev);
 970
 971                 /*
 972                  * Configure power management to the driver here so that its
 973                  * correctly set also after interface type changes etc.
 974                  */
 975                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 976                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 977                     rdev->ops->set_power_mgmt)
 978                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 979                                                 wdev->ps_timeout)) {
 980                                 /* assume this means it's off */
 981                                 wdev->ps = false;
 982                         }
 983                 break;
 984         case NETDEV_UNREGISTER:
 985                 /*
 986                  * NB: cannot take rdev->mtx here because this may be
 987                  * called within code protected by it when interfaces
 988                  * are removed with nl80211.
 989                  */
 990                 mutex_lock(&rdev->devlist_mtx);
 991                 /*
 992                  * It is possible to get NETDEV_UNREGISTER
 993                  * multiple times. To detect that, check
 994                  * that the interface is still on the list
 995                  * of registered interfaces, and only then
 996                  * remove and clean it up.
 997                  */
 998                 if (!list_empty(&wdev->list)) {
 999                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1000                         list_del_rcu(&wdev->list);
1001                         rdev->devlist_generation++;
1002                         cfg80211_mlme_purge_registrations(wdev);
1003 #ifdef CONFIG_CFG80211_WEXT
1004                         kfree(wdev->wext.keys);
1005 #endif
1006                 }
1007                 mutex_unlock(&rdev->devlist_mtx);
1008                 /*
1009                  * synchronise (so that we won't find this netdev
1010                  * from other code any more) and then clear the list
1011                  * head so that the above code can safely check for
1012                  * !list_empty() to avoid double-cleanup.
1013                  */
1014                 synchronize_rcu();
1015                 INIT_LIST_HEAD(&wdev->list);
1016                 /*
1017                  * Ensure that all events have been processed and
1018                  * freed.
1019                  */
1020                 cfg80211_process_wdev_events(wdev);
1021                 break;
1022         case NETDEV_PRE_UP:
1023                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1024                         return notifier_from_errno(-EOPNOTSUPP);
1025                 if (rfkill_blocked(rdev->rfkill))
1026                         return notifier_from_errno(-ERFKILL);
1027                 mutex_lock(&rdev->devlist_mtx);
1028                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
1029                 mutex_unlock(&rdev->devlist_mtx);
1030                 if (ret)
1031                         return notifier_from_errno(ret);
1032                 break;
1033         }
1034
1035         return NOTIFY_DONE;
1036 }
1037
1038 static struct notifier_block cfg80211_netdev_notifier = {
1039         .notifier_call = cfg80211_netdev_notifier_call,
1040 };
1041
1042 static void __net_exit cfg80211_pernet_exit(struct net *net)
1043 {
1044         struct cfg80211_registered_device *rdev;
1045
1046         rtnl_lock();
1047         mutex_lock(&cfg80211_mutex);
1048         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1049                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1050                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1051         }
1052         mutex_unlock(&cfg80211_mutex);
1053         rtnl_unlock();
1054 }
1055
1056 static struct pernet_operations cfg80211_pernet_ops = {
1057         .exit = cfg80211_pernet_exit,
1058 };
1059
1060 static int __init cfg80211_init(void)
1061 {
1062         int err;
1063
1064         err = register_pernet_device(&cfg80211_pernet_ops);
1065         if (err)
1066                 goto out_fail_pernet;
1067
1068         err = wiphy_sysfs_init();
1069         if (err)
1070                 goto out_fail_sysfs;
1071
1072         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1073         if (err)
1074                 goto out_fail_notifier;
1075
1076         err = nl80211_init();
1077         if (err)
1078                 goto out_fail_nl80211;
1079
1080         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1081
1082         err = regulatory_init();
1083         if (err)
1084                 goto out_fail_reg;
1085
1086         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1087         if (!cfg80211_wq)
1088                 goto out_fail_wq;
1089
1090         return 0;
1091
1092 out_fail_wq:
1093         regulatory_exit();
1094 out_fail_reg:
1095         debugfs_remove(ieee80211_debugfs_dir);
1096 out_fail_nl80211:
1097         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1098 out_fail_notifier:
1099         wiphy_sysfs_exit();
1100 out_fail_sysfs:
1101         unregister_pernet_device(&cfg80211_pernet_ops);
1102 out_fail_pernet:
1103         return err;
1104 }
1105 subsys_initcall(cfg80211_init);
1106
1107 static void __exit cfg80211_exit(void)
1108 {
1109         debugfs_remove(ieee80211_debugfs_dir);
1110         nl80211_exit();
1111         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1112         wiphy_sysfs_exit();
1113         regulatory_exit();
1114         unregister_pernet_device(&cfg80211_pernet_ops);
1115         destroy_workqueue(cfg80211_wq);
1116 }
1117 module_exit(cfg80211_exit);