linux/net/wireless/core.c
<<
>>
Prefs
   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
  33MODULE_AUTHOR("Johannes Berg");
  34MODULE_LICENSE("GPL");
  35MODULE_DESCRIPTION("wireless configuration support");
  36
  37/* RCU-protected (and cfg80211_mutex for writers) */
  38LIST_HEAD(cfg80211_rdev_list);
  39int cfg80211_rdev_list_generation;
  40
  41DEFINE_MUTEX(cfg80211_mutex);
  42
  43/* for debugfs */
  44static struct dentry *ieee80211_debugfs_dir;
  45
  46/* for the cleanup, scan and event works */
  47struct workqueue_struct *cfg80211_wq;
  48
  49static bool cfg80211_disable_40mhz_24ghz;
  50module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                 "Disable 40MHz support in the 2.4GHz band");
  53
  54/* requires cfg80211_mutex to be held! */
  55struct 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
  74int 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! */
  84struct 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
  99struct cfg80211_registered_device *
 100cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 101{
 102        struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 103        struct net_device *dev;
 104
 105        mutex_lock(&cfg80211_mutex);
 106        dev = dev_get_by_index(net, ifindex);
 107        if (!dev)
 108                goto out;
 109        if (dev->ieee80211_ptr) {
 110                rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 111                mutex_lock(&rdev->mtx);
 112        } else
 113                rdev = ERR_PTR(-ENODEV);
 114        dev_put(dev);
 115 out:
 116        mutex_unlock(&cfg80211_mutex);
 117        return rdev;
 118}
 119
 120/* requires cfg80211_mutex to be held */
 121int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 122                        char *newname)
 123{
 124        struct cfg80211_registered_device *rdev2;
 125        int wiphy_idx, taken = -1, result, digits;
 126
 127        assert_cfg80211_lock();
 128
 129        /* prohibit calling the thing phy%d when %d is not its number */
 130        sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 131        if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 132                /* count number of places needed to print wiphy_idx */
 133                digits = 1;
 134                while (wiphy_idx /= 10)
 135                        digits++;
 136                /*
 137                 * deny the name if it is phy<idx> where <idx> is printed
 138                 * without leading zeroes. taken == strlen(newname) here
 139                 */
 140                if (taken == strlen(PHY_NAME) + digits)
 141                        return -EINVAL;
 142        }
 143
 144
 145        /* Ignore nop renames */
 146        if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 147                return 0;
 148
 149        /* Ensure another device does not already have this name. */
 150        list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 151                if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 152                        return -EINVAL;
 153
 154        result = device_rename(&rdev->wiphy.dev, newname);
 155        if (result)
 156                return result;
 157
 158        if (rdev->wiphy.debugfsdir &&
 159            !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 160                            rdev->wiphy.debugfsdir,
 161                            rdev->wiphy.debugfsdir->d_parent,
 162                            newname))
 163                pr_err("failed to rename debugfs dir to %s!\n", newname);
 164
 165        nl80211_notify_dev_rename(rdev);
 166
 167        return 0;
 168}
 169
 170int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 171                          struct net *net)
 172{
 173        struct wireless_dev *wdev;
 174        int err = 0;
 175
 176        if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 177                return -EOPNOTSUPP;
 178
 179        list_for_each_entry(wdev, &rdev->wdev_list, list) {
 180                if (!wdev->netdev)
 181                        continue;
 182                wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 183                err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 184                if (err)
 185                        break;
 186                wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 187        }
 188
 189        if (err) {
 190                /* failed -- clean up to old netns */
 191                net = wiphy_net(&rdev->wiphy);
 192
 193                list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 194                                                     list) {
 195                        if (!wdev->netdev)
 196                                continue;
 197                        wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 198                        err = dev_change_net_namespace(wdev->netdev, net,
 199                                                        "wlan%d");
 200                        WARN_ON(err);
 201                        wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 202                }
 203
 204                return err;
 205        }
 206
 207        wiphy_net_set(&rdev->wiphy, net);
 208
 209        err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 210        WARN_ON(err);
 211
 212        return 0;
 213}
 214
 215static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 216{
 217        struct cfg80211_registered_device *rdev = data;
 218
 219        rdev->ops->rfkill_poll(&rdev->wiphy);
 220}
 221
 222static int cfg80211_rfkill_set_block(void *data, bool blocked)
 223{
 224        struct cfg80211_registered_device *rdev = data;
 225        struct wireless_dev *wdev;
 226
 227        if (!blocked)
 228                return 0;
 229
 230        rtnl_lock();
 231        mutex_lock(&rdev->devlist_mtx);
 232
 233        list_for_each_entry(wdev, &rdev->wdev_list, list) {
 234                if (wdev->netdev) {
 235                        dev_close(wdev->netdev);
 236                        continue;
 237                }
 238                /* otherwise, check iftype */
 239                switch (wdev->iftype) {
 240                case NL80211_IFTYPE_P2P_DEVICE:
 241                        if (!wdev->p2p_started)
 242                                break;
 243                        rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
 244                        wdev->p2p_started = false;
 245                        rdev->opencount--;
 246                        break;
 247                default:
 248                        break;
 249                }
 250        }
 251
 252        mutex_unlock(&rdev->devlist_mtx);
 253        rtnl_unlock();
 254
 255        return 0;
 256}
 257
 258static void cfg80211_rfkill_sync_work(struct work_struct *work)
 259{
 260        struct cfg80211_registered_device *rdev;
 261
 262        rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 263        cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 264}
 265
 266static void cfg80211_event_work(struct work_struct *work)
 267{
 268        struct cfg80211_registered_device *rdev;
 269
 270        rdev = container_of(work, struct cfg80211_registered_device,
 271                            event_work);
 272
 273        rtnl_lock();
 274        cfg80211_lock_rdev(rdev);
 275
 276        cfg80211_process_rdev_events(rdev);
 277        cfg80211_unlock_rdev(rdev);
 278        rtnl_unlock();
 279}
 280
 281/* exported functions */
 282
 283struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 284{
 285        static int wiphy_counter;
 286
 287        struct cfg80211_registered_device *rdev;
 288        int alloc_size;
 289
 290        WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 291        WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 292        WARN_ON(ops->connect && !ops->disconnect);
 293        WARN_ON(ops->join_ibss && !ops->leave_ibss);
 294        WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 295        WARN_ON(ops->add_station && !ops->del_station);
 296        WARN_ON(ops->add_mpath && !ops->del_mpath);
 297        WARN_ON(ops->join_mesh && !ops->leave_mesh);
 298
 299        alloc_size = sizeof(*rdev) + sizeof_priv;
 300
 301        rdev = kzalloc(alloc_size, GFP_KERNEL);
 302        if (!rdev)
 303                return NULL;
 304
 305        rdev->ops = ops;
 306
 307        mutex_lock(&cfg80211_mutex);
 308
 309        rdev->wiphy_idx = wiphy_counter++;
 310
 311        if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 312                wiphy_counter--;
 313                mutex_unlock(&cfg80211_mutex);
 314                /* ugh, wrapped! */
 315                kfree(rdev);
 316                return NULL;
 317        }
 318
 319        mutex_unlock(&cfg80211_mutex);
 320
 321        /* give it a proper name */
 322        dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 323
 324        mutex_init(&rdev->mtx);
 325        mutex_init(&rdev->devlist_mtx);
 326        mutex_init(&rdev->sched_scan_mtx);
 327        INIT_LIST_HEAD(&rdev->wdev_list);
 328        spin_lock_init(&rdev->bss_lock);
 329        INIT_LIST_HEAD(&rdev->bss_list);
 330        INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 331        INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 332#ifdef CONFIG_CFG80211_WEXT
 333        rdev->wiphy.wext = &cfg80211_wext_handler;
 334#endif
 335
 336        device_initialize(&rdev->wiphy.dev);
 337        rdev->wiphy.dev.class = &ieee80211_class;
 338        rdev->wiphy.dev.platform_data = rdev;
 339
 340#ifdef CONFIG_CFG80211_DEFAULT_PS
 341        rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 342#endif
 343
 344        wiphy_net_set(&rdev->wiphy, &init_net);
 345
 346        rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 347        rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 348                                   &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 349                                   &rdev->rfkill_ops, rdev);
 350
 351        if (!rdev->rfkill) {
 352                kfree(rdev);
 353                return NULL;
 354        }
 355
 356        INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 357        INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 358        INIT_WORK(&rdev->event_work, cfg80211_event_work);
 359
 360        init_waitqueue_head(&rdev->dev_wait);
 361
 362        /*
 363         * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 364         * Fragmentation and RTS threshold are disabled by default with the
 365         * special -1 value.
 366         */
 367        rdev->wiphy.retry_short = 7;
 368        rdev->wiphy.retry_long = 4;
 369        rdev->wiphy.frag_threshold = (u32) -1;
 370        rdev->wiphy.rts_threshold = (u32) -1;
 371        rdev->wiphy.coverage_class = 0;
 372
 373        return &rdev->wiphy;
 374}
 375EXPORT_SYMBOL(wiphy_new);
 376
 377static int wiphy_verify_combinations(struct wiphy *wiphy)
 378{
 379        const struct ieee80211_iface_combination *c;
 380        int i, j;
 381
 382        for (i = 0; i < wiphy->n_iface_combinations; i++) {
 383                u32 cnt = 0;
 384                u16 all_iftypes = 0;
 385
 386                c = &wiphy->iface_combinations[i];
 387
 388                /* Combinations with just one interface aren't real */
 389                if (WARN_ON(c->max_interfaces < 2))
 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                if (WARN_ON(!c->n_limits))
 405                        return -EINVAL;
 406
 407                for (j = 0; j < c->n_limits; j++) {
 408                        u16 types = c->limits[j].types;
 409
 410                        /*
 411                         * interface types shouldn't overlap, this is
 412                         * used in cfg80211_can_change_interface()
 413                         */
 414                        if (WARN_ON(types & all_iftypes))
 415                                return -EINVAL;
 416                        all_iftypes |= types;
 417
 418                        if (WARN_ON(!c->limits[j].max))
 419                                return -EINVAL;
 420
 421                        /* Shouldn't list software iftypes in combinations! */
 422                        if (WARN_ON(wiphy->software_iftypes & types))
 423                                return -EINVAL;
 424
 425                        /* Only a single P2P_DEVICE can be allowed */
 426                        if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 427                                    c->limits[j].max > 1))
 428                                return -EINVAL;
 429
 430                        cnt += c->limits[j].max;
 431                        /*
 432                         * Don't advertise an unsupported type
 433                         * in a combination.
 434                         */
 435                        if (WARN_ON((wiphy->interface_modes & types) != types))
 436                                return -EINVAL;
 437                }
 438
 439                /* You can't even choose that many! */
 440                if (WARN_ON(cnt < c->max_interfaces))
 441                        return -EINVAL;
 442        }
 443
 444        return 0;
 445}
 446
 447int wiphy_register(struct wiphy *wiphy)
 448{
 449        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 450        int res;
 451        enum ieee80211_band band;
 452        struct ieee80211_supported_band *sband;
 453        bool have_band = false;
 454        int i;
 455        u16 ifmodes = wiphy->interface_modes;
 456
 457#ifdef CONFIG_PM
 458        if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 459                    !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 460                return -EINVAL;
 461#endif
 462
 463        if (WARN_ON(wiphy->ap_sme_capa &&
 464                    !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 465                return -EINVAL;
 466
 467        if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 468                return -EINVAL;
 469
 470        if (WARN_ON(wiphy->addresses &&
 471                    !is_zero_ether_addr(wiphy->perm_addr) &&
 472                    memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 473                           ETH_ALEN)))
 474                return -EINVAL;
 475
 476        if (wiphy->addresses)
 477                memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 478
 479        /* sanity check ifmodes */
 480        WARN_ON(!ifmodes);
 481        ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 482        if (WARN_ON(ifmodes != wiphy->interface_modes))
 483                wiphy->interface_modes = ifmodes;
 484
 485        res = wiphy_verify_combinations(wiphy);
 486        if (res)
 487                return res;
 488
 489        /* sanity check supported bands/channels */
 490        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 491                sband = wiphy->bands[band];
 492                if (!sband)
 493                        continue;
 494
 495                sband->band = band;
 496                if (WARN_ON(!sband->n_channels))
 497                        return -EINVAL;
 498                /*
 499                 * on 60gHz band, there are no legacy rates, so
 500                 * n_bitrates is 0
 501                 */
 502                if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 503                            !sband->n_bitrates))
 504                        return -EINVAL;
 505
 506                /*
 507                 * Since cfg80211_disable_40mhz_24ghz is global, we can
 508                 * modify the sband's ht data even if the driver uses a
 509                 * global structure for that.
 510                 */
 511                if (cfg80211_disable_40mhz_24ghz &&
 512                    band == IEEE80211_BAND_2GHZ &&
 513                    sband->ht_cap.ht_supported) {
 514                        sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 515                        sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 516                }
 517
 518                /*
 519                 * Since we use a u32 for rate bitmaps in
 520                 * ieee80211_get_response_rate, we cannot
 521                 * have more than 32 legacy rates.
 522                 */
 523                if (WARN_ON(sband->n_bitrates > 32))
 524                        return -EINVAL;
 525
 526                for (i = 0; i < sband->n_channels; i++) {
 527                        sband->channels[i].orig_flags =
 528                                sband->channels[i].flags;
 529                        sband->channels[i].orig_mag = INT_MAX;
 530                        sband->channels[i].orig_mpwr =
 531                                sband->channels[i].max_power;
 532                        sband->channels[i].band = band;
 533                }
 534
 535                have_band = true;
 536        }
 537
 538        if (!have_band) {
 539                WARN_ON(1);
 540                return -EINVAL;
 541        }
 542
 543#ifdef CONFIG_PM
 544        if (rdev->wiphy.wowlan.n_patterns) {
 545                if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 546                            rdev->wiphy.wowlan.pattern_min_len >
 547                            rdev->wiphy.wowlan.pattern_max_len))
 548                        return -EINVAL;
 549        }
 550#endif
 551
 552        /* check and set up bitrates */
 553        ieee80211_set_bitrate_flags(wiphy);
 554
 555        mutex_lock(&cfg80211_mutex);
 556
 557        res = device_add(&rdev->wiphy.dev);
 558        if (res) {
 559                mutex_unlock(&cfg80211_mutex);
 560                return res;
 561        }
 562
 563        /* set up regulatory info */
 564        wiphy_regulatory_register(wiphy);
 565
 566        list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 567        cfg80211_rdev_list_generation++;
 568
 569        /* add to debugfs */
 570        rdev->wiphy.debugfsdir =
 571                debugfs_create_dir(wiphy_name(&rdev->wiphy),
 572                                   ieee80211_debugfs_dir);
 573        if (IS_ERR(rdev->wiphy.debugfsdir))
 574                rdev->wiphy.debugfsdir = NULL;
 575
 576        if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 577                struct regulatory_request request;
 578
 579                request.wiphy_idx = get_wiphy_idx(wiphy);
 580                request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 581                request.alpha2[0] = '9';
 582                request.alpha2[1] = '9';
 583
 584                nl80211_send_reg_change_event(&request);
 585        }
 586
 587        cfg80211_debugfs_rdev_add(rdev);
 588        mutex_unlock(&cfg80211_mutex);
 589
 590        /*
 591         * due to a locking dependency this has to be outside of the
 592         * cfg80211_mutex lock
 593         */
 594        res = rfkill_register(rdev->rfkill);
 595        if (res)
 596                goto out_rm_dev;
 597
 598        rtnl_lock();
 599        rdev->wiphy.registered = true;
 600        rtnl_unlock();
 601        return 0;
 602
 603out_rm_dev:
 604        device_del(&rdev->wiphy.dev);
 605        return res;
 606}
 607EXPORT_SYMBOL(wiphy_register);
 608
 609void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 610{
 611        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 612
 613        if (!rdev->ops->rfkill_poll)
 614                return;
 615        rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 616        rfkill_resume_polling(rdev->rfkill);
 617}
 618EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 619
 620void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 621{
 622        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 623
 624        rfkill_pause_polling(rdev->rfkill);
 625}
 626EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 627
 628void wiphy_unregister(struct wiphy *wiphy)
 629{
 630        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 631
 632        rtnl_lock();
 633        rdev->wiphy.registered = false;
 634        rtnl_unlock();
 635
 636        rfkill_unregister(rdev->rfkill);
 637
 638        /* protect the device list */
 639        mutex_lock(&cfg80211_mutex);
 640
 641        wait_event(rdev->dev_wait, ({
 642                int __count;
 643                mutex_lock(&rdev->devlist_mtx);
 644                __count = rdev->opencount;
 645                mutex_unlock(&rdev->devlist_mtx);
 646                __count == 0; }));
 647
 648        mutex_lock(&rdev->devlist_mtx);
 649        BUG_ON(!list_empty(&rdev->wdev_list));
 650        mutex_unlock(&rdev->devlist_mtx);
 651
 652        /*
 653         * First remove the hardware from everywhere, this makes
 654         * it impossible to find from userspace.
 655         */
 656        debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 657        list_del_rcu(&rdev->list);
 658        synchronize_rcu();
 659
 660        /*
 661         * Try to grab rdev->mtx. If a command is still in progress,
 662         * hopefully the driver will refuse it since it's tearing
 663         * down the device already. We wait for this command to complete
 664         * before unlinking the item from the list.
 665         * Note: as codified by the BUG_ON above we cannot get here if
 666         * a virtual interface is still present. Hence, we can only get
 667         * to lock contention here if userspace issues a command that
 668         * identified the hardware by wiphy index.
 669         */
 670        cfg80211_lock_rdev(rdev);
 671        /* nothing */
 672        cfg80211_unlock_rdev(rdev);
 673
 674        /*
 675         * If this device got a regulatory hint tell core its
 676         * free to listen now to a new shiny device regulatory hint
 677         */
 678        wiphy_regulatory_deregister(wiphy);
 679
 680        cfg80211_rdev_list_generation++;
 681        device_del(&rdev->wiphy.dev);
 682
 683        mutex_unlock(&cfg80211_mutex);
 684
 685        flush_work(&rdev->scan_done_wk);
 686        cancel_work_sync(&rdev->conn_work);
 687        flush_work(&rdev->event_work);
 688
 689        if (rdev->wowlan && rdev->ops->set_wakeup)
 690                rdev->ops->set_wakeup(&rdev->wiphy, false);
 691        cfg80211_rdev_free_wowlan(rdev);
 692}
 693EXPORT_SYMBOL(wiphy_unregister);
 694
 695void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 696{
 697        struct cfg80211_internal_bss *scan, *tmp;
 698        rfkill_destroy(rdev->rfkill);
 699        mutex_destroy(&rdev->mtx);
 700        mutex_destroy(&rdev->devlist_mtx);
 701        mutex_destroy(&rdev->sched_scan_mtx);
 702        list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 703                cfg80211_put_bss(&scan->pub);
 704        kfree(rdev);
 705}
 706
 707void wiphy_free(struct wiphy *wiphy)
 708{
 709        put_device(&wiphy->dev);
 710}
 711EXPORT_SYMBOL(wiphy_free);
 712
 713void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 714{
 715        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 716
 717        if (rfkill_set_hw_state(rdev->rfkill, blocked))
 718                schedule_work(&rdev->rfkill_sync);
 719}
 720EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 721
 722static void wdev_cleanup_work(struct work_struct *work)
 723{
 724        struct wireless_dev *wdev;
 725        struct cfg80211_registered_device *rdev;
 726
 727        wdev = container_of(work, struct wireless_dev, cleanup_work);
 728        rdev = wiphy_to_dev(wdev->wiphy);
 729
 730        cfg80211_lock_rdev(rdev);
 731
 732        if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
 733                rdev->scan_req->aborted = true;
 734                ___cfg80211_scan_done(rdev, true);
 735        }
 736
 737        cfg80211_unlock_rdev(rdev);
 738
 739        mutex_lock(&rdev->sched_scan_mtx);
 740
 741        if (WARN_ON(rdev->sched_scan_req &&
 742                    rdev->sched_scan_req->dev == wdev->netdev)) {
 743                __cfg80211_stop_sched_scan(rdev, false);
 744        }
 745
 746        mutex_unlock(&rdev->sched_scan_mtx);
 747
 748        mutex_lock(&rdev->devlist_mtx);
 749        rdev->opencount--;
 750        mutex_unlock(&rdev->devlist_mtx);
 751        wake_up(&rdev->dev_wait);
 752
 753        dev_put(wdev->netdev);
 754}
 755
 756void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 757{
 758        struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 759
 760        ASSERT_RTNL();
 761
 762        if (WARN_ON(wdev->netdev))
 763                return;
 764
 765        mutex_lock(&rdev->devlist_mtx);
 766        list_del_rcu(&wdev->list);
 767        rdev->devlist_generation++;
 768
 769        switch (wdev->iftype) {
 770        case NL80211_IFTYPE_P2P_DEVICE:
 771                if (!wdev->p2p_started)
 772                        break;
 773                rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
 774                wdev->p2p_started = false;
 775                rdev->opencount--;
 776                break;
 777        default:
 778                WARN_ON_ONCE(1);
 779                break;
 780        }
 781        mutex_unlock(&rdev->devlist_mtx);
 782}
 783EXPORT_SYMBOL(cfg80211_unregister_wdev);
 784
 785static struct device_type wiphy_type = {
 786        .name   = "wlan",
 787};
 788
 789void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 790                               enum nl80211_iftype iftype, int num)
 791{
 792        ASSERT_RTNL();
 793
 794        rdev->num_running_ifaces += num;
 795        if (iftype == NL80211_IFTYPE_MONITOR)
 796                rdev->num_running_monitor_ifaces += num;
 797}
 798
 799static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 800                                         unsigned long state,
 801                                         void *ndev)
 802{
 803        struct net_device *dev = ndev;
 804        struct wireless_dev *wdev = dev->ieee80211_ptr;
 805        struct cfg80211_registered_device *rdev;
 806        int ret;
 807
 808        if (!wdev)
 809                return NOTIFY_DONE;
 810
 811        rdev = wiphy_to_dev(wdev->wiphy);
 812
 813        WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 814
 815        switch (state) {
 816        case NETDEV_POST_INIT:
 817                SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 818                break;
 819        case NETDEV_REGISTER:
 820                /*
 821                 * NB: cannot take rdev->mtx here because this may be
 822                 * called within code protected by it when interfaces
 823                 * are added with nl80211.
 824                 */
 825                mutex_init(&wdev->mtx);
 826                INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 827                INIT_LIST_HEAD(&wdev->event_list);
 828                spin_lock_init(&wdev->event_lock);
 829                INIT_LIST_HEAD(&wdev->mgmt_registrations);
 830                spin_lock_init(&wdev->mgmt_registrations_lock);
 831
 832                mutex_lock(&rdev->devlist_mtx);
 833                wdev->identifier = ++rdev->wdev_id;
 834                list_add_rcu(&wdev->list, &rdev->wdev_list);
 835                rdev->devlist_generation++;
 836                /* can only change netns with wiphy */
 837                dev->features |= NETIF_F_NETNS_LOCAL;
 838
 839                if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 840                                      "phy80211")) {
 841                        pr_err("failed to add phy80211 symlink to netdev!\n");
 842                }
 843                wdev->netdev = dev;
 844                wdev->sme_state = CFG80211_SME_IDLE;
 845                mutex_unlock(&rdev->devlist_mtx);
 846#ifdef CONFIG_CFG80211_WEXT
 847                wdev->wext.default_key = -1;
 848                wdev->wext.default_mgmt_key = -1;
 849                wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 850#endif
 851
 852                if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 853                        wdev->ps = true;
 854                else
 855                        wdev->ps = false;
 856                /* allow mac80211 to determine the timeout */
 857                wdev->ps_timeout = -1;
 858
 859                if (!dev->ethtool_ops)
 860                        dev->ethtool_ops = &cfg80211_ethtool_ops;
 861
 862                if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 863                     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 864                     wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 865                        dev->priv_flags |= IFF_DONT_BRIDGE;
 866                break;
 867        case NETDEV_GOING_DOWN:
 868                switch (wdev->iftype) {
 869                case NL80211_IFTYPE_ADHOC:
 870                        cfg80211_leave_ibss(rdev, dev, true);
 871                        break;
 872                case NL80211_IFTYPE_P2P_CLIENT:
 873                case NL80211_IFTYPE_STATION:
 874                        mutex_lock(&rdev->sched_scan_mtx);
 875                        __cfg80211_stop_sched_scan(rdev, false);
 876                        mutex_unlock(&rdev->sched_scan_mtx);
 877
 878                        wdev_lock(wdev);
 879#ifdef CONFIG_CFG80211_WEXT
 880                        kfree(wdev->wext.ie);
 881                        wdev->wext.ie = NULL;
 882                        wdev->wext.ie_len = 0;
 883                        wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 884#endif
 885                        __cfg80211_disconnect(rdev, dev,
 886                                              WLAN_REASON_DEAUTH_LEAVING, true);
 887                        cfg80211_mlme_down(rdev, dev);
 888                        wdev_unlock(wdev);
 889                        break;
 890                case NL80211_IFTYPE_MESH_POINT:
 891                        cfg80211_leave_mesh(rdev, dev);
 892                        break;
 893                case NL80211_IFTYPE_AP:
 894                        cfg80211_stop_ap(rdev, dev);
 895                        break;
 896                default:
 897                        break;
 898                }
 899                wdev->beacon_interval = 0;
 900                break;
 901        case NETDEV_DOWN:
 902                cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 903                dev_hold(dev);
 904                queue_work(cfg80211_wq, &wdev->cleanup_work);
 905                break;
 906        case NETDEV_UP:
 907                /*
 908                 * If we have a really quick DOWN/UP succession we may
 909                 * have this work still pending ... cancel it and see
 910                 * if it was pending, in which case we need to account
 911                 * for some of the work it would have done.
 912                 */
 913                if (cancel_work_sync(&wdev->cleanup_work)) {
 914                        mutex_lock(&rdev->devlist_mtx);
 915                        rdev->opencount--;
 916                        mutex_unlock(&rdev->devlist_mtx);
 917                        dev_put(dev);
 918                }
 919                cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 920                cfg80211_lock_rdev(rdev);
 921                mutex_lock(&rdev->devlist_mtx);
 922                wdev_lock(wdev);
 923                switch (wdev->iftype) {
 924#ifdef CONFIG_CFG80211_WEXT
 925                case NL80211_IFTYPE_ADHOC:
 926                        cfg80211_ibss_wext_join(rdev, wdev);
 927                        break;
 928                case NL80211_IFTYPE_STATION:
 929                        cfg80211_mgd_wext_connect(rdev, wdev);
 930                        break;
 931#endif
 932#ifdef CONFIG_MAC80211_MESH
 933                case NL80211_IFTYPE_MESH_POINT:
 934                        {
 935                                /* backward compat code... */
 936                                struct mesh_setup setup;
 937                                memcpy(&setup, &default_mesh_setup,
 938                                                sizeof(setup));
 939                                 /* back compat only needed for mesh_id */
 940                                setup.mesh_id = wdev->ssid;
 941                                setup.mesh_id_len = wdev->mesh_id_up_len;
 942                                if (wdev->mesh_id_up_len)
 943                                        __cfg80211_join_mesh(rdev, dev,
 944                                                        &setup,
 945                                                        &default_mesh_config);
 946                                break;
 947                        }
 948#endif
 949                default:
 950                        break;
 951                }
 952                wdev_unlock(wdev);
 953                rdev->opencount++;
 954                mutex_unlock(&rdev->devlist_mtx);
 955                cfg80211_unlock_rdev(rdev);
 956
 957                /*
 958                 * Configure power management to the driver here so that its
 959                 * correctly set also after interface type changes etc.
 960                 */
 961                if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 962                     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 963                    rdev->ops->set_power_mgmt)
 964                        if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 965                                                      wdev->ps,
 966                                                      wdev->ps_timeout)) {
 967                                /* assume this means it's off */
 968                                wdev->ps = false;
 969                        }
 970                break;
 971        case NETDEV_UNREGISTER:
 972                /*
 973                 * NB: cannot take rdev->mtx here because this may be
 974                 * called within code protected by it when interfaces
 975                 * are removed with nl80211.
 976                 */
 977                mutex_lock(&rdev->devlist_mtx);
 978                /*
 979                 * It is possible to get NETDEV_UNREGISTER
 980                 * multiple times. To detect that, check
 981                 * that the interface is still on the list
 982                 * of registered interfaces, and only then
 983                 * remove and clean it up.
 984                 */
 985                if (!list_empty(&wdev->list)) {
 986                        sysfs_remove_link(&dev->dev.kobj, "phy80211");
 987                        list_del_rcu(&wdev->list);
 988                        rdev->devlist_generation++;
 989                        cfg80211_mlme_purge_registrations(wdev);
 990#ifdef CONFIG_CFG80211_WEXT
 991                        kfree(wdev->wext.keys);
 992#endif
 993                }
 994                mutex_unlock(&rdev->devlist_mtx);
 995                /*
 996                 * synchronise (so that we won't find this netdev
 997                 * from other code any more) and then clear the list
 998                 * head so that the above code can safely check for
 999                 * !list_empty() to avoid double-cleanup.
1000                 */
1001                synchronize_rcu();
1002                INIT_LIST_HEAD(&wdev->list);
1003                /*
1004                 * Ensure that all events have been processed and
1005                 * freed.
1006                 */
1007                cfg80211_process_wdev_events(wdev);
1008                break;
1009        case NETDEV_PRE_UP:
1010                if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1011                        return notifier_from_errno(-EOPNOTSUPP);
1012                if (rfkill_blocked(rdev->rfkill))
1013                        return notifier_from_errno(-ERFKILL);
1014                mutex_lock(&rdev->devlist_mtx);
1015                ret = cfg80211_can_add_interface(rdev, wdev->iftype);
1016                mutex_unlock(&rdev->devlist_mtx);
1017                if (ret)
1018                        return notifier_from_errno(ret);
1019                break;
1020        }
1021
1022        return NOTIFY_DONE;
1023}
1024
1025static struct notifier_block cfg80211_netdev_notifier = {
1026        .notifier_call = cfg80211_netdev_notifier_call,
1027};
1028
1029static void __net_exit cfg80211_pernet_exit(struct net *net)
1030{
1031        struct cfg80211_registered_device *rdev;
1032
1033        rtnl_lock();
1034        mutex_lock(&cfg80211_mutex);
1035        list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1036                if (net_eq(wiphy_net(&rdev->wiphy), net))
1037                        WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1038        }
1039        mutex_unlock(&cfg80211_mutex);
1040        rtnl_unlock();
1041}
1042
1043static struct pernet_operations cfg80211_pernet_ops = {
1044        .exit = cfg80211_pernet_exit,
1045};
1046
1047static int __init cfg80211_init(void)
1048{
1049        int err;
1050
1051        err = register_pernet_device(&cfg80211_pernet_ops);
1052        if (err)
1053                goto out_fail_pernet;
1054
1055        err = wiphy_sysfs_init();
1056        if (err)
1057                goto out_fail_sysfs;
1058
1059        err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1060        if (err)
1061                goto out_fail_notifier;
1062
1063        err = nl80211_init();
1064        if (err)
1065                goto out_fail_nl80211;
1066
1067        ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1068
1069        err = regulatory_init();
1070        if (err)
1071                goto out_fail_reg;
1072
1073        cfg80211_wq = create_singlethread_workqueue("cfg80211");
1074        if (!cfg80211_wq)
1075                goto out_fail_wq;
1076
1077        return 0;
1078
1079out_fail_wq:
1080        regulatory_exit();
1081out_fail_reg:
1082        debugfs_remove(ieee80211_debugfs_dir);
1083out_fail_nl80211:
1084        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1085out_fail_notifier:
1086        wiphy_sysfs_exit();
1087out_fail_sysfs:
1088        unregister_pernet_device(&cfg80211_pernet_ops);
1089out_fail_pernet:
1090        return err;
1091}
1092subsys_initcall(cfg80211_init);
1093
1094static void __exit cfg80211_exit(void)
1095{
1096        debugfs_remove(ieee80211_debugfs_dir);
1097        nl80211_exit();
1098        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1099        wiphy_sysfs_exit();
1100        regulatory_exit();
1101        unregister_pernet_device(&cfg80211_pernet_ops);
1102        destroy_workqueue(cfg80211_wq);
1103}
1104module_exit(cfg80211_exit);
1105
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.