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 #include <linux/if.h>
   8 #include <linux/module.h>
   9 #include <linux/err.h>
  10 #include <linux/list.h>
  11 #include <linux/nl80211.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/notifier.h>
  14 #include <linux/device.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/sched.h>
  18 #include <net/genetlink.h>
  19 #include <net/cfg80211.h>
  20 #include "nl80211.h"
  21 #include "core.h"
  22 #include "sysfs.h"
  23 #include "debugfs.h"
  24 #include "wext-compat.h"
  25 #include "ethtool.h"
  26
  27 /* name for sysfs, %d is appended */
  28 #define PHY_NAME "phy"
  29
  30 MODULE_AUTHOR("Johannes Berg");
  31 MODULE_LICENSE("GPL");
  32 MODULE_DESCRIPTION("wireless configuration support");
  33
  34 /* RCU-protected (and cfg80211_mutex for writers) */
  35 LIST_HEAD(cfg80211_rdev_list);
  36 int cfg80211_rdev_list_generation;
  37
  38 DEFINE_MUTEX(cfg80211_mutex);
  39
  40 /* for debugfs */
  41 static struct dentry *ieee80211_debugfs_dir;
  42
  43 /* for the cleanup, scan and event works */
  44 struct workqueue_struct *cfg80211_wq;
  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 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 228                           struct net *net)
 229 {
 230         struct wireless_dev *wdev;
 231         int err = 0;
 232
 233         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 234                 return -EOPNOTSUPP;
 235
 236         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 237                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 238                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 239                 if (err)
 240                         break;
 241                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 242         }
 243
 244         if (err) {
 245                 /* failed -- clean up to old netns */
 246                 net = wiphy_net(&rdev->wiphy);
 247
 248                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 249                                                      list) {
 250                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 251                         err = dev_change_net_namespace(wdev->netdev, net,
 252                                                         "wlan%d");
 253                         WARN_ON(err);
 254                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 255                 }
 256         }
 257
 258         wiphy_net_set(&rdev->wiphy, net);
 259
 260         return err;
 261 }
 262 #endif
 263
 264 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 265 {
 266         struct cfg80211_registered_device *rdev = data;
 267
 268         rdev->ops->rfkill_poll(&rdev->wiphy);
 269 }
 270
 271 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 272 {
 273         struct cfg80211_registered_device *rdev = data;
 274         struct wireless_dev *wdev;
 275
 276         if (!blocked)
 277                 return 0;
 278
 279         rtnl_lock();
 280         mutex_lock(&rdev->devlist_mtx);
 281
 282         list_for_each_entry(wdev, &rdev->netdev_list, list)
 283                 dev_close(wdev->netdev);
 284
 285         mutex_unlock(&rdev->devlist_mtx);
 286         rtnl_unlock();
 287
 288         return 0;
 289 }
 290
 291 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 292 {
 293         struct cfg80211_registered_device *rdev;
 294
 295         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 296         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 297 }
 298
 299 static void cfg80211_event_work(struct work_struct *work)
 300 {
 301         struct cfg80211_registered_device *rdev;
 302
 303         rdev = container_of(work, struct cfg80211_registered_device,
 304                             event_work);
 305
 306         rtnl_lock();
 307         cfg80211_lock_rdev(rdev);
 308
 309         cfg80211_process_rdev_events(rdev);
 310         cfg80211_unlock_rdev(rdev);
 311         rtnl_unlock();
 312 }
 313
 314 /* exported functions */
 315
 316 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 317 {
 318         static int wiphy_counter;
 319
 320         struct cfg80211_registered_device *rdev;
 321         int alloc_size;
 322
 323         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 324         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 325         WARN_ON(ops->connect && !ops->disconnect);
 326         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 327         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 328         WARN_ON(ops->add_station && !ops->del_station);
 329         WARN_ON(ops->add_mpath && !ops->del_mpath);
 330
 331         alloc_size = sizeof(*rdev) + sizeof_priv;
 332
 333         rdev = kzalloc(alloc_size, GFP_KERNEL);
 334         if (!rdev)
 335                 return NULL;
 336
 337         rdev->ops = ops;
 338
 339         mutex_lock(&cfg80211_mutex);
 340
 341         rdev->wiphy_idx = wiphy_counter++;
 342
 343         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 344                 wiphy_counter--;
 345                 mutex_unlock(&cfg80211_mutex);
 346                 /* ugh, wrapped! */
 347                 kfree(rdev);
 348                 return NULL;
 349         }
 350
 351         mutex_unlock(&cfg80211_mutex);
 352
 353         /* give it a proper name */
 354         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 355
 356         mutex_init(&rdev->mtx);
 357         mutex_init(&rdev->devlist_mtx);
 358         INIT_LIST_HEAD(&rdev->netdev_list);
 359         spin_lock_init(&rdev->bss_lock);
 360         INIT_LIST_HEAD(&rdev->bss_list);
 361         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 362
 363 #ifdef CONFIG_CFG80211_WEXT
 364         rdev->wiphy.wext = &cfg80211_wext_handler;
 365 #endif
 366
 367         device_initialize(&rdev->wiphy.dev);
 368         rdev->wiphy.dev.class = &ieee80211_class;
 369         rdev->wiphy.dev.platform_data = rdev;
 370
 371 #ifdef CONFIG_CFG80211_DEFAULT_PS
 372         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 373 #endif
 374
 375 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 376         wiphy_net_set(&rdev->wiphy, &init_net);
 377 #endif
 378
 379         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 380         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 381                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 382                                    &rdev->rfkill_ops, rdev);
 383
 384         if (!rdev->rfkill) {
 385                 kfree(rdev);
 386                 return NULL;
 387         }
 388
 389         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 390         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 391         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 392
 393         init_waitqueue_head(&rdev->dev_wait);
 394
 395         /*
 396          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 397          * Fragmentation and RTS threshold are disabled by default with the
 398          * special -1 value.
 399          */
 400         rdev->wiphy.retry_short = 7;
 401         rdev->wiphy.retry_long = 4;
 402         rdev->wiphy.frag_threshold = (u32) -1;
 403         rdev->wiphy.rts_threshold = (u32) -1;
 404         rdev->wiphy.coverage_class = 0;
 405
 406         return &rdev->wiphy;
 407 }
 408 EXPORT_SYMBOL(wiphy_new);
 409
 410 int wiphy_register(struct wiphy *wiphy)
 411 {
 412         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 413         int res;
 414         enum ieee80211_band band;
 415         struct ieee80211_supported_band *sband;
 416         bool have_band = false;
 417         int i;
 418         u16 ifmodes = wiphy->interface_modes;
 419
 420         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 421                 return -EINVAL;
 422
 423         if (WARN_ON(wiphy->addresses &&
 424                     !is_zero_ether_addr(wiphy->perm_addr) &&
 425                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 426                            ETH_ALEN)))
 427                 return -EINVAL;
 428
 429         if (wiphy->addresses)
 430                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 431
 432         /* sanity check ifmodes */
 433         WARN_ON(!ifmodes);
 434         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 435         if (WARN_ON(ifmodes != wiphy->interface_modes))
 436                 wiphy->interface_modes = ifmodes;
 437
 438         /* sanity check supported bands/channels */
 439         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 440                 sband = wiphy->bands[band];
 441                 if (!sband)
 442                         continue;
 443
 444                 sband->band = band;
 445
 446                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 447                         return -EINVAL;
 448
 449                 /*
 450                  * Since we use a u32 for rate bitmaps in
 451                  * ieee80211_get_response_rate, we cannot
 452                  * have more than 32 legacy rates.
 453                  */
 454                 if (WARN_ON(sband->n_bitrates > 32))
 455                         return -EINVAL;
 456
 457                 for (i = 0; i < sband->n_channels; i++) {
 458                         sband->channels[i].orig_flags =
 459                                 sband->channels[i].flags;
 460                         sband->channels[i].orig_mag =
 461                                 sband->channels[i].max_antenna_gain;
 462                         sband->channels[i].orig_mpwr =
 463                                 sband->channels[i].max_power;
 464                         sband->channels[i].band = band;
 465                 }
 466
 467                 have_band = true;
 468         }
 469
 470         if (!have_band) {
 471                 WARN_ON(1);
 472                 return -EINVAL;
 473         }
 474
 475         /* check and set up bitrates */
 476         ieee80211_set_bitrate_flags(wiphy);
 477
 478         res = device_add(&rdev->wiphy.dev);
 479         if (res)
 480                 return res;
 481
 482         res = rfkill_register(rdev->rfkill);
 483         if (res)
 484                 goto out_rm_dev;
 485
 486         mutex_lock(&cfg80211_mutex);
 487
 488         /* set up regulatory info */
 489         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 490
 491         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 492         cfg80211_rdev_list_generation++;
 493
 494         mutex_unlock(&cfg80211_mutex);
 495
 496         /* add to debugfs */
 497         rdev->wiphy.debugfsdir =
 498                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 499                                    ieee80211_debugfs_dir);
 500         if (IS_ERR(rdev->wiphy.debugfsdir))
 501                 rdev->wiphy.debugfsdir = NULL;
 502
 503         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 504                 struct regulatory_request request;
 505
 506                 request.wiphy_idx = get_wiphy_idx(wiphy);
 507                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 508                 request.alpha2[0] = '9';
 509                 request.alpha2[1] = '9';
 510
 511                 nl80211_send_reg_change_event(&request);
 512         }
 513
 514         cfg80211_debugfs_rdev_add(rdev);
 515
 516         return 0;
 517
 518  out_rm_dev:
 519         device_del(&rdev->wiphy.dev);
 520         return res;
 521 }
 522 EXPORT_SYMBOL(wiphy_register);
 523
 524 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 525 {
 526         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 527
 528         if (!rdev->ops->rfkill_poll)
 529                 return;
 530         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 531         rfkill_resume_polling(rdev->rfkill);
 532 }
 533 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 534
 535 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 536 {
 537         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 538
 539         rfkill_pause_polling(rdev->rfkill);
 540 }
 541 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 542
 543 void wiphy_unregister(struct wiphy *wiphy)
 544 {
 545         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 546
 547         rfkill_unregister(rdev->rfkill);
 548
 549         /* protect the device list */
 550         mutex_lock(&cfg80211_mutex);
 551
 552         wait_event(rdev->dev_wait, ({
 553                 int __count;
 554                 mutex_lock(&rdev->devlist_mtx);
 555                 __count = rdev->opencount;
 556                 mutex_unlock(&rdev->devlist_mtx);
 557                 __count == 0;}));
 558
 559         mutex_lock(&rdev->devlist_mtx);
 560         BUG_ON(!list_empty(&rdev->netdev_list));
 561         mutex_unlock(&rdev->devlist_mtx);
 562
 563         /*
 564          * First remove the hardware from everywhere, this makes
 565          * it impossible to find from userspace.
 566          */
 567         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 568         list_del_rcu(&rdev->list);
 569         synchronize_rcu();
 570
 571         /*
 572          * Try to grab rdev->mtx. If a command is still in progress,
 573          * hopefully the driver will refuse it since it's tearing
 574          * down the device already. We wait for this command to complete
 575          * before unlinking the item from the list.
 576          * Note: as codified by the BUG_ON above we cannot get here if
 577          * a virtual interface is still present. Hence, we can only get
 578          * to lock contention here if userspace issues a command that
 579          * identified the hardware by wiphy index.
 580          */
 581         cfg80211_lock_rdev(rdev);
 582         /* nothing */
 583         cfg80211_unlock_rdev(rdev);
 584
 585         /* If this device got a regulatory hint tell core its
 586          * free to listen now to a new shiny device regulatory hint */
 587         reg_device_remove(wiphy);
 588
 589         cfg80211_rdev_list_generation++;
 590         device_del(&rdev->wiphy.dev);
 591
 592         mutex_unlock(&cfg80211_mutex);
 593
 594         flush_work(&rdev->scan_done_wk);
 595         cancel_work_sync(&rdev->conn_work);
 596         flush_work(&rdev->event_work);
 597 }
 598 EXPORT_SYMBOL(wiphy_unregister);
 599
 600 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 601 {
 602         struct cfg80211_internal_bss *scan, *tmp;
 603         rfkill_destroy(rdev->rfkill);
 604         mutex_destroy(&rdev->mtx);
 605         mutex_destroy(&rdev->devlist_mtx);
 606         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 607                 cfg80211_put_bss(&scan->pub);
 608         kfree(rdev);
 609 }
 610
 611 void wiphy_free(struct wiphy *wiphy)
 612 {
 613         put_device(&wiphy->dev);
 614 }
 615 EXPORT_SYMBOL(wiphy_free);
 616
 617 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 618 {
 619         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 620
 621         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 622                 schedule_work(&rdev->rfkill_sync);
 623 }
 624 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 625
 626 static void wdev_cleanup_work(struct work_struct *work)
 627 {
 628         struct wireless_dev *wdev;
 629         struct cfg80211_registered_device *rdev;
 630
 631         wdev = container_of(work, struct wireless_dev, cleanup_work);
 632         rdev = wiphy_to_dev(wdev->wiphy);
 633
 634         cfg80211_lock_rdev(rdev);
 635
 636         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 637                 rdev->scan_req->aborted = true;
 638                 ___cfg80211_scan_done(rdev, true);
 639         }
 640
 641         cfg80211_unlock_rdev(rdev);
 642
 643         mutex_lock(&rdev->devlist_mtx);
 644         rdev->opencount--;
 645         mutex_unlock(&rdev->devlist_mtx);
 646         wake_up(&rdev->dev_wait);
 647
 648         dev_put(wdev->netdev);
 649 }
 650
 651 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32))
 652 static struct device_type wiphy_type = {
 653         .name   = "wlan",
 654 };
 655 #endif
 656
 657 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 658                                          unsigned long state,
 659                                          void *ndev)
 660 {
 661         struct net_device *dev = ndev;
 662         struct wireless_dev *wdev = dev->ieee80211_ptr;
 663         struct cfg80211_registered_device *rdev;
 664
 665         if (!wdev)
 666                 return NOTIFY_DONE;
 667
 668         rdev = wiphy_to_dev(wdev->wiphy);
 669
 670         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 671
 672         switch (state) {
 673         case NETDEV_POST_INIT:
 674                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 675                 break;
 676         case NETDEV_REGISTER:
 677                 /*
 678                  * NB: cannot take rdev->mtx here because this may be
 679                  * called within code protected by it when interfaces
 680                  * are added with nl80211.
 681                  */
 682                 mutex_init(&wdev->mtx);
 683                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 684                 INIT_LIST_HEAD(&wdev->event_list);
 685                 spin_lock_init(&wdev->event_lock);
 686                 INIT_LIST_HEAD(&wdev->action_registrations);
 687                 spin_lock_init(&wdev->action_registrations_lock);
 688
 689                 mutex_lock(&rdev->devlist_mtx);
 690                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 691                 rdev->devlist_generation++;
 692 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 693                 /* can only change netns with wiphy */
 694                 dev->features |= NETIF_F_NETNS_LOCAL;
 695 #endif
 696
 697                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 698                                       "phy80211")) {
 699                         printk(KERN_ERR "wireless: failed to add phy80211 "
 700                                 "symlink to netdev!\n");
 701                 }
 702                 wdev->netdev = dev;
 703                 wdev->sme_state = CFG80211_SME_IDLE;
 704                 mutex_unlock(&rdev->devlist_mtx);
 705 #ifdef CONFIG_CFG80211_WEXT
 706 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32))
 707                 if (!dev->wireless_handlers)
 708                         dev->wireless_handlers = &cfg80211_wext_handler;
 709 #endif
 710                 wdev->wext.default_key = -1;
 711                 wdev->wext.default_mgmt_key = -1;
 712                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 713 #endif
 714
 715                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 716                         wdev->ps = true;
 717                 else
 718                         wdev->ps = false;
 719                 wdev->ps_timeout = 100;
 720                 if (rdev->ops->set_power_mgmt)
 721                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 722                                                       wdev->ps,
 723                                                       wdev->ps_timeout)) {
 724                                 /* assume this means it's off */
 725                                 wdev->ps = false;
 726                         }
 727
 728                 if (!dev->ethtool_ops)
 729                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 730
 731                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 732                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 733                         dev->priv_flags |= IFF_DONT_BRIDGE;
 734                 break;
 735         case NETDEV_GOING_DOWN:
 736                 switch (wdev->iftype) {
 737                 case NL80211_IFTYPE_ADHOC:
 738                         cfg80211_leave_ibss(rdev, dev, true);
 739                         break;
 740                 case NL80211_IFTYPE_STATION:
 741                         wdev_lock(wdev);
 742 #ifdef CONFIG_CFG80211_WEXT
 743                         kfree(wdev->wext.ie);
 744                         wdev->wext.ie = NULL;
 745                         wdev->wext.ie_len = 0;
 746                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 747 #endif
 748                         __cfg80211_disconnect(rdev, dev,
 749                                               WLAN_REASON_DEAUTH_LEAVING, true);
 750                         cfg80211_mlme_down(rdev, dev);
 751                         wdev_unlock(wdev);
 752                         break;
 753                 default:
 754                         break;
 755                 }
 756                 break;
 757         case NETDEV_DOWN:
 758                 dev_hold(dev);
 759                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 760                 break;
 761         case NETDEV_UP:
 762                 /*
 763                  * If we have a really quick DOWN/UP succession we may
 764                  * have this work still pending ... cancel it and see
 765                  * if it was pending, in which case we need to account
 766                  * for some of the work it would have done.
 767                  */
 768                 if (cancel_work_sync(&wdev->cleanup_work)) {
 769                         mutex_lock(&rdev->devlist_mtx);
 770                         rdev->opencount--;
 771                         mutex_unlock(&rdev->devlist_mtx);
 772                         dev_put(dev);
 773                 }
 774                 cfg80211_lock_rdev(rdev);
 775                 mutex_lock(&rdev->devlist_mtx);
 776 #ifdef CONFIG_CFG80211_WEXT
 777                 wdev_lock(wdev);
 778                 switch (wdev->iftype) {
 779                 case NL80211_IFTYPE_ADHOC:
 780                         cfg80211_ibss_wext_join(rdev, wdev);
 781                         break;
 782                 case NL80211_IFTYPE_STATION:
 783                         cfg80211_mgd_wext_connect(rdev, wdev);
 784                         break;
 785                 default:
 786                         break;
 787                 }
 788                 wdev_unlock(wdev);
 789 #endif
 790                 rdev->opencount++;
 791                 mutex_unlock(&rdev->devlist_mtx);
 792                 cfg80211_unlock_rdev(rdev);
 793                 break;
 794         case NETDEV_UNREGISTER:
 795                 /*
 796                  * NB: cannot take rdev->mtx here because this may be
 797                  * called within code protected by it when interfaces
 798                  * are removed with nl80211.
 799                  */
 800                 mutex_lock(&rdev->devlist_mtx);
 801                 /*
 802                  * It is possible to get NETDEV_UNREGISTER
 803                  * multiple times. To detect that, check
 804                  * that the interface is still on the list
 805                  * of registered interfaces, and only then
 806                  * remove and clean it up.
 807                  */
 808                 if (!list_empty(&wdev->list)) {
 809                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 810                         list_del_rcu(&wdev->list);
 811                         rdev->devlist_generation++;
 812                         cfg80211_mlme_purge_actions(wdev);
 813 #ifdef CONFIG_CFG80211_WEXT
 814                         kfree(wdev->wext.keys);
 815 #endif
 816                 }
 817                 mutex_unlock(&rdev->devlist_mtx);
 818                 /*
 819                  * synchronise (so that we won't find this netdev
 820                  * from other code any more) and then clear the list
 821                  * head so that the above code can safely check for
 822                  * !list_empty() to avoid double-cleanup.
 823                  */
 824                 synchronize_rcu();
 825                 INIT_LIST_HEAD(&wdev->list);
 826                 break;
 827         case NETDEV_PRE_UP:
 828                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 829                         return notifier_from_errno(-EOPNOTSUPP);
 830                 if (rfkill_blocked(rdev->rfkill))
 831                         return notifier_from_errno(-ERFKILL);
 832                 break;
 833         }
 834
 835         return NOTIFY_DONE;
 836 }
 837
 838 static struct notifier_block cfg80211_netdev_notifier = {
 839         .notifier_call = cfg80211_netdev_notifier_call,
 840 };
 841
 842 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 843 static void __net_exit cfg80211_pernet_exit(struct net *net)
 844 {
 845         struct cfg80211_registered_device *rdev;
 846
 847         rtnl_lock();
 848         mutex_lock(&cfg80211_mutex);
 849         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 850                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 851                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 852         }
 853         mutex_unlock(&cfg80211_mutex);
 854         rtnl_unlock();
 855 }
 856
 857 static struct pernet_operations cfg80211_pernet_ops = {
 858         .exit = cfg80211_pernet_exit,
 859 };
 860 #endif
 861
 862 static int __init cfg80211_init(void)
 863 {
 864         int err;
 865
 866 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 867         err = register_pernet_device(&cfg80211_pernet_ops);
 868         if (err)
 869                 goto out_fail_pernet;
 870 #endif
 871
 872         err = wiphy_sysfs_init();
 873         if (err)
 874                 goto out_fail_sysfs;
 875
 876         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 877         if (err)
 878                 goto out_fail_notifier;
 879
 880         err = nl80211_init();
 881         if (err)
 882                 goto out_fail_nl80211;
 883
 884         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 885
 886         err = regulatory_init();
 887         if (err)
 888                 goto out_fail_reg;
 889
 890         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 891         if (!cfg80211_wq)
 892                 goto out_fail_wq;
 893
 894         return 0;
 895
 896 out_fail_wq:
 897         regulatory_exit();
 898 out_fail_reg:
 899         debugfs_remove(ieee80211_debugfs_dir);
 900 out_fail_nl80211:
 901         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 902 out_fail_notifier:
 903         wiphy_sysfs_exit();
 904 out_fail_sysfs:
 905 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 906         unregister_pernet_device(&cfg80211_pernet_ops);
 907 out_fail_pernet:
 908 #endif
 909         return err;
 910 }
 911 subsys_initcall(cfg80211_init);
 912
 913 static void cfg80211_exit(void)
 914 {
 915         debugfs_remove(ieee80211_debugfs_dir);
 916         nl80211_exit();
 917         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 918         wiphy_sysfs_exit();
 919         regulatory_exit();
 920 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 921         unregister_pernet_device(&cfg80211_pernet_ops);
 922 #endif
 923         destroy_workqueue(cfg80211_wq);
 924 }
 925 module_exit(cfg80211_exit);