linux/net/wireless/core.c
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   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
 237        mutex_unlock(&rdev->devlist_mtx);
 238        rtnl_unlock();
 239
 240        return 0;
 241}
 242
 243static void cfg80211_rfkill_sync_work(struct work_struct *work)
 244{
 245        struct cfg80211_registered_device *rdev;
 246
 247        rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 248        cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 249}
 250
 251static void cfg80211_event_work(struct work_struct *work)
 252{
 253        struct cfg80211_registered_device *rdev;
 254
 255        rdev = container_of(work, struct cfg80211_registered_device,
 256                            event_work);
 257
 258        rtnl_lock();
 259        cfg80211_lock_rdev(rdev);
 260
 261        cfg80211_process_rdev_events(rdev);
 262        cfg80211_unlock_rdev(rdev);
 263        rtnl_unlock();
 264}
 265
 266/* exported functions */
 267
 268struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 269{
 270        static int wiphy_counter;
 271
 272        struct cfg80211_registered_device *rdev;
 273        int alloc_size;
 274
 275        WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 276        WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 277        WARN_ON(ops->connect && !ops->disconnect);
 278        WARN_ON(ops->join_ibss && !ops->leave_ibss);
 279        WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 280        WARN_ON(ops->add_station && !ops->del_station);
 281        WARN_ON(ops->add_mpath && !ops->del_mpath);
 282        WARN_ON(ops->join_mesh && !ops->leave_mesh);
 283
 284        alloc_size = sizeof(*rdev) + sizeof_priv;
 285
 286        rdev = kzalloc(alloc_size, GFP_KERNEL);
 287        if (!rdev)
 288                return NULL;
 289
 290        rdev->ops = ops;
 291
 292        mutex_lock(&cfg80211_mutex);
 293
 294        rdev->wiphy_idx = wiphy_counter++;
 295
 296        if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 297                wiphy_counter--;
 298                mutex_unlock(&cfg80211_mutex);
 299                /* ugh, wrapped! */
 300                kfree(rdev);
 301                return NULL;
 302        }
 303
 304        mutex_unlock(&cfg80211_mutex);
 305
 306        /* give it a proper name */
 307        dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 308
 309        mutex_init(&rdev->mtx);
 310        mutex_init(&rdev->devlist_mtx);
 311        mutex_init(&rdev->sched_scan_mtx);
 312        INIT_LIST_HEAD(&rdev->wdev_list);
 313        spin_lock_init(&rdev->bss_lock);
 314        INIT_LIST_HEAD(&rdev->bss_list);
 315        INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 316        INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 317#ifdef CONFIG_CFG80211_WEXT
 318        rdev->wiphy.wext = &cfg80211_wext_handler;
 319#endif
 320
 321        device_initialize(&rdev->wiphy.dev);
 322        rdev->wiphy.dev.class = &ieee80211_class;
 323        rdev->wiphy.dev.platform_data = rdev;
 324
 325#ifdef CONFIG_CFG80211_DEFAULT_PS
 326        rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 327#endif
 328
 329        wiphy_net_set(&rdev->wiphy, &init_net);
 330
 331        rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 332        rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 333                                   &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 334                                   &rdev->rfkill_ops, rdev);
 335
 336        if (!rdev->rfkill) {
 337                kfree(rdev);
 338                return NULL;
 339        }
 340
 341        INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 342        INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 343        INIT_WORK(&rdev->event_work, cfg80211_event_work);
 344
 345        init_waitqueue_head(&rdev->dev_wait);
 346
 347        /*
 348         * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 349         * Fragmentation and RTS threshold are disabled by default with the
 350         * special -1 value.
 351         */
 352        rdev->wiphy.retry_short = 7;
 353        rdev->wiphy.retry_long = 4;
 354        rdev->wiphy.frag_threshold = (u32) -1;
 355        rdev->wiphy.rts_threshold = (u32) -1;
 356        rdev->wiphy.coverage_class = 0;
 357
 358        return &rdev->wiphy;
 359}
 360EXPORT_SYMBOL(wiphy_new);
 361
 362static int wiphy_verify_combinations(struct wiphy *wiphy)
 363{
 364        const struct ieee80211_iface_combination *c;
 365        int i, j;
 366
 367        for (i = 0; i < wiphy->n_iface_combinations; i++) {
 368                u32 cnt = 0;
 369                u16 all_iftypes = 0;
 370
 371                c = &wiphy->iface_combinations[i];
 372
 373                /* Combinations with just one interface aren't real */
 374                if (WARN_ON(c->max_interfaces < 2))
 375                        return -EINVAL;
 376
 377                /* Need at least one channel */
 378                if (WARN_ON(!c->num_different_channels))
 379                        return -EINVAL;
 380
 381                /*
 382                 * Put a sane limit on maximum number of different
 383                 * channels to simplify channel accounting code.
 384                 */
 385                if (WARN_ON(c->num_different_channels >
 386                                CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 387                        return -EINVAL;
 388
 389                if (WARN_ON(!c->n_limits))
 390                        return -EINVAL;
 391
 392                for (j = 0; j < c->n_limits; j++) {
 393                        u16 types = c->limits[j].types;
 394
 395                        /*
 396                         * interface types shouldn't overlap, this is
 397                         * used in cfg80211_can_change_interface()
 398                         */
 399                        if (WARN_ON(types & all_iftypes))
 400                                return -EINVAL;
 401                        all_iftypes |= types;
 402
 403                        if (WARN_ON(!c->limits[j].max))
 404                                return -EINVAL;
 405
 406                        /* Shouldn't list software iftypes in combinations! */
 407                        if (WARN_ON(wiphy->software_iftypes & types))
 408                                return -EINVAL;
 409
 410                        cnt += c->limits[j].max;
 411                        /*
 412                         * Don't advertise an unsupported type
 413                         * in a combination.
 414                         */
 415                        if (WARN_ON((wiphy->interface_modes & types) != types))
 416                                return -EINVAL;
 417                }
 418
 419                /* You can't even choose that many! */
 420                if (WARN_ON(cnt < c->max_interfaces))
 421                        return -EINVAL;
 422        }
 423
 424        return 0;
 425}
 426
 427int wiphy_register(struct wiphy *wiphy)
 428{
 429        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 430        int res;
 431        enum ieee80211_band band;
 432        struct ieee80211_supported_band *sband;
 433        bool have_band = false;
 434        int i;
 435        u16 ifmodes = wiphy->interface_modes;
 436
 437#ifdef CONFIG_PM
 438        if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 439                    !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 440                return -EINVAL;
 441#endif
 442
 443        if (WARN_ON(wiphy->ap_sme_capa &&
 444                    !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 445                return -EINVAL;
 446
 447        if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 448                return -EINVAL;
 449
 450        if (WARN_ON(wiphy->addresses &&
 451                    !is_zero_ether_addr(wiphy->perm_addr) &&
 452                    memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 453                           ETH_ALEN)))
 454                return -EINVAL;
 455
 456        if (wiphy->addresses)
 457                memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 458
 459        /* sanity check ifmodes */
 460        WARN_ON(!ifmodes);
 461        ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 462        if (WARN_ON(ifmodes != wiphy->interface_modes))
 463                wiphy->interface_modes = ifmodes;
 464
 465        res = wiphy_verify_combinations(wiphy);
 466        if (res)
 467                return res;
 468
 469        /* sanity check supported bands/channels */
 470        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 471                sband = wiphy->bands[band];
 472                if (!sband)
 473                        continue;
 474
 475                sband->band = band;
 476                if (WARN_ON(!sband->n_channels))
 477                        return -EINVAL;
 478                /*
 479                 * on 60gHz band, there are no legacy rates, so
 480                 * n_bitrates is 0
 481                 */
 482                if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 483                            !sband->n_bitrates))
 484                        return -EINVAL;
 485
 486                /*
 487                 * Since cfg80211_disable_40mhz_24ghz is global, we can
 488                 * modify the sband's ht data even if the driver uses a
 489                 * global structure for that.
 490                 */
 491                if (cfg80211_disable_40mhz_24ghz &&
 492                    band == IEEE80211_BAND_2GHZ &&
 493                    sband->ht_cap.ht_supported) {
 494                        sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 495                        sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 496                }
 497
 498                /*
 499                 * Since we use a u32 for rate bitmaps in
 500                 * ieee80211_get_response_rate, we cannot
 501                 * have more than 32 legacy rates.
 502                 */
 503                if (WARN_ON(sband->n_bitrates > 32))
 504                        return -EINVAL;
 505
 506                for (i = 0; i < sband->n_channels; i++) {
 507                        sband->channels[i].orig_flags =
 508                                sband->channels[i].flags;
 509                        sband->channels[i].orig_mag = INT_MAX;
 510                        sband->channels[i].orig_mpwr =
 511                                sband->channels[i].max_power;
 512                        sband->channels[i].band = band;
 513                }
 514
 515                have_band = true;
 516        }
 517
 518        if (!have_band) {
 519                WARN_ON(1);
 520                return -EINVAL;
 521        }
 522
 523#ifdef CONFIG_PM
 524        if (rdev->wiphy.wowlan.n_patterns) {
 525                if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 526                            rdev->wiphy.wowlan.pattern_min_len >
 527                            rdev->wiphy.wowlan.pattern_max_len))
 528                        return -EINVAL;
 529        }
 530#endif
 531
 532        /* check and set up bitrates */
 533        ieee80211_set_bitrate_flags(wiphy);
 534
 535        mutex_lock(&cfg80211_mutex);
 536
 537        res = device_add(&rdev->wiphy.dev);
 538        if (res) {
 539                mutex_unlock(&cfg80211_mutex);
 540                return res;
 541        }
 542
 543        /* set up regulatory info */
 544        wiphy_regulatory_register(wiphy);
 545
 546        list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 547        cfg80211_rdev_list_generation++;
 548
 549        /* add to debugfs */
 550        rdev->wiphy.debugfsdir =
 551                debugfs_create_dir(wiphy_name(&rdev->wiphy),
 552                                   ieee80211_debugfs_dir);
 553        if (IS_ERR(rdev->wiphy.debugfsdir))
 554                rdev->wiphy.debugfsdir = NULL;
 555
 556        if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 557                struct regulatory_request request;
 558
 559                request.wiphy_idx = get_wiphy_idx(wiphy);
 560                request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 561                request.alpha2[0] = '9';
 562                request.alpha2[1] = '9';
 563
 564                nl80211_send_reg_change_event(&request);
 565        }
 566
 567        cfg80211_debugfs_rdev_add(rdev);
 568        mutex_unlock(&cfg80211_mutex);
 569
 570        /*
 571         * due to a locking dependency this has to be outside of the
 572         * cfg80211_mutex lock
 573         */
 574        res = rfkill_register(rdev->rfkill);
 575        if (res)
 576                goto out_rm_dev;
 577
 578        rtnl_lock();
 579        rdev->wiphy.registered = true;
 580        rtnl_unlock();
 581        return 0;
 582
 583out_rm_dev:
 584        device_del(&rdev->wiphy.dev);
 585        return res;
 586}
 587EXPORT_SYMBOL(wiphy_register);
 588
 589void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 590{
 591        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 592
 593        if (!rdev->ops->rfkill_poll)
 594                return;
 595        rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 596        rfkill_resume_polling(rdev->rfkill);
 597}
 598EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 599
 600void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 601{
 602        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 603
 604        rfkill_pause_polling(rdev->rfkill);
 605}
 606EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 607
 608void wiphy_unregister(struct wiphy *wiphy)
 609{
 610        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 611
 612        rtnl_lock();
 613        rdev->wiphy.registered = false;
 614        rtnl_unlock();
 615
 616        rfkill_unregister(rdev->rfkill);
 617
 618        /* protect the device list */
 619        mutex_lock(&cfg80211_mutex);
 620
 621        wait_event(rdev->dev_wait, ({
 622                int __count;
 623                mutex_lock(&rdev->devlist_mtx);
 624                __count = rdev->opencount;
 625                mutex_unlock(&rdev->devlist_mtx);
 626                __count == 0; }));
 627
 628        mutex_lock(&rdev->devlist_mtx);
 629        BUG_ON(!list_empty(&rdev->wdev_list));
 630        mutex_unlock(&rdev->devlist_mtx);
 631
 632        /*
 633         * First remove the hardware from everywhere, this makes
 634         * it impossible to find from userspace.
 635         */
 636        debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 637        list_del_rcu(&rdev->list);
 638        synchronize_rcu();
 639
 640        /*
 641         * Try to grab rdev->mtx. If a command is still in progress,
 642         * hopefully the driver will refuse it since it's tearing
 643         * down the device already. We wait for this command to complete
 644         * before unlinking the item from the list.
 645         * Note: as codified by the BUG_ON above we cannot get here if
 646         * a virtual interface is still present. Hence, we can only get
 647         * to lock contention here if userspace issues a command that
 648         * identified the hardware by wiphy index.
 649         */
 650        cfg80211_lock_rdev(rdev);
 651        /* nothing */
 652        cfg80211_unlock_rdev(rdev);
 653
 654        /*
 655         * If this device got a regulatory hint tell core its
 656         * free to listen now to a new shiny device regulatory hint
 657         */
 658        wiphy_regulatory_deregister(wiphy);
 659
 660        cfg80211_rdev_list_generation++;
 661        device_del(&rdev->wiphy.dev);
 662
 663        mutex_unlock(&cfg80211_mutex);
 664
 665        flush_work(&rdev->scan_done_wk);
 666        cancel_work_sync(&rdev->conn_work);
 667        flush_work(&rdev->event_work);
 668
 669        if (rdev->wowlan && rdev->ops->set_wakeup)
 670                rdev->ops->set_wakeup(&rdev->wiphy, false);
 671        cfg80211_rdev_free_wowlan(rdev);
 672}
 673EXPORT_SYMBOL(wiphy_unregister);
 674
 675void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 676{
 677        struct cfg80211_internal_bss *scan, *tmp;
 678        rfkill_destroy(rdev->rfkill);
 679        mutex_destroy(&rdev->mtx);
 680        mutex_destroy(&rdev->devlist_mtx);
 681        mutex_destroy(&rdev->sched_scan_mtx);
 682        list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 683                cfg80211_put_bss(&scan->pub);
 684        kfree(rdev);
 685}
 686
 687void wiphy_free(struct wiphy *wiphy)
 688{
 689        put_device(&wiphy->dev);
 690}
 691EXPORT_SYMBOL(wiphy_free);
 692
 693void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 694{
 695        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 696
 697        if (rfkill_set_hw_state(rdev->rfkill, blocked))
 698                schedule_work(&rdev->rfkill_sync);
 699}
 700EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 701
 702static void wdev_cleanup_work(struct work_struct *work)
 703{
 704        struct wireless_dev *wdev;
 705        struct cfg80211_registered_device *rdev;
 706
 707        wdev = container_of(work, struct wireless_dev, cleanup_work);
 708        rdev = wiphy_to_dev(wdev->wiphy);
 709
 710        cfg80211_lock_rdev(rdev);
 711
 712        if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
 713                rdev->scan_req->aborted = true;
 714                ___cfg80211_scan_done(rdev, true);
 715        }
 716
 717        cfg80211_unlock_rdev(rdev);
 718
 719        mutex_lock(&rdev->sched_scan_mtx);
 720
 721        if (WARN_ON(rdev->sched_scan_req &&
 722                    rdev->sched_scan_req->dev == wdev->netdev)) {
 723                __cfg80211_stop_sched_scan(rdev, false);
 724        }
 725
 726        mutex_unlock(&rdev->sched_scan_mtx);
 727
 728        mutex_lock(&rdev->devlist_mtx);
 729        rdev->opencount--;
 730        mutex_unlock(&rdev->devlist_mtx);
 731        wake_up(&rdev->dev_wait);
 732
 733        dev_put(wdev->netdev);
 734}
 735
 736static struct device_type wiphy_type = {
 737        .name   = "wlan",
 738};
 739
 740void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 741                               enum nl80211_iftype iftype, int num)
 742{
 743        ASSERT_RTNL();
 744
 745        rdev->num_running_ifaces += num;
 746        if (iftype == NL80211_IFTYPE_MONITOR)
 747                rdev->num_running_monitor_ifaces += num;
 748}
 749
 750static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 751                                         unsigned long state,
 752                                         void *ndev)
 753{
 754        struct net_device *dev = ndev;
 755        struct wireless_dev *wdev = dev->ieee80211_ptr;
 756        struct cfg80211_registered_device *rdev;
 757        int ret;
 758
 759        if (!wdev)
 760                return NOTIFY_DONE;
 761
 762        rdev = wiphy_to_dev(wdev->wiphy);
 763
 764        WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 765
 766        switch (state) {
 767        case NETDEV_POST_INIT:
 768                SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 769                break;
 770        case NETDEV_REGISTER:
 771                /*
 772                 * NB: cannot take rdev->mtx here because this may be
 773                 * called within code protected by it when interfaces
 774                 * are added with nl80211.
 775                 */
 776                mutex_init(&wdev->mtx);
 777                INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 778                INIT_LIST_HEAD(&wdev->event_list);
 779                spin_lock_init(&wdev->event_lock);
 780                INIT_LIST_HEAD(&wdev->mgmt_registrations);
 781                spin_lock_init(&wdev->mgmt_registrations_lock);
 782
 783                mutex_lock(&rdev->devlist_mtx);
 784                wdev->identifier = ++rdev->wdev_id;
 785                list_add_rcu(&wdev->list, &rdev->wdev_list);
 786                rdev->devlist_generation++;
 787                /* can only change netns with wiphy */
 788                dev->features |= NETIF_F_NETNS_LOCAL;
 789
 790                if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 791                                      "phy80211")) {
 792                        pr_err("failed to add phy80211 symlink to netdev!\n");
 793                }
 794                wdev->netdev = dev;
 795                wdev->sme_state = CFG80211_SME_IDLE;
 796                mutex_unlock(&rdev->devlist_mtx);
 797#ifdef CONFIG_CFG80211_WEXT
 798                wdev->wext.default_key = -1;
 799                wdev->wext.default_mgmt_key = -1;
 800                wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 801#endif
 802
 803                if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 804                        wdev->ps = true;
 805                else
 806                        wdev->ps = false;
 807                /* allow mac80211 to determine the timeout */
 808                wdev->ps_timeout = -1;
 809
 810                if (!dev->ethtool_ops)
 811                        dev->ethtool_ops = &cfg80211_ethtool_ops;
 812
 813                if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 814                     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 815                     wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 816                        dev->priv_flags |= IFF_DONT_BRIDGE;
 817                break;
 818        case NETDEV_GOING_DOWN:
 819                switch (wdev->iftype) {
 820                case NL80211_IFTYPE_ADHOC:
 821                        cfg80211_leave_ibss(rdev, dev, true);
 822                        break;
 823                case NL80211_IFTYPE_P2P_CLIENT:
 824                case NL80211_IFTYPE_STATION:
 825                        mutex_lock(&rdev->sched_scan_mtx);
 826                        __cfg80211_stop_sched_scan(rdev, false);
 827                        mutex_unlock(&rdev->sched_scan_mtx);
 828
 829                        wdev_lock(wdev);
 830#ifdef CONFIG_CFG80211_WEXT
 831                        kfree(wdev->wext.ie);
 832                        wdev->wext.ie = NULL;
 833                        wdev->wext.ie_len = 0;
 834                        wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 835#endif
 836                        __cfg80211_disconnect(rdev, dev,
 837                                              WLAN_REASON_DEAUTH_LEAVING, true);
 838                        cfg80211_mlme_down(rdev, dev);
 839                        wdev_unlock(wdev);
 840                        break;
 841                case NL80211_IFTYPE_MESH_POINT:
 842                        cfg80211_leave_mesh(rdev, dev);
 843                        break;
 844                case NL80211_IFTYPE_AP:
 845                        cfg80211_stop_ap(rdev, dev);
 846                        break;
 847                default:
 848                        break;
 849                }
 850                wdev->beacon_interval = 0;
 851                break;
 852        case NETDEV_DOWN:
 853                cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 854                dev_hold(dev);
 855                queue_work(cfg80211_wq, &wdev->cleanup_work);
 856                break;
 857        case NETDEV_UP:
 858                /*
 859                 * If we have a really quick DOWN/UP succession we may
 860                 * have this work still pending ... cancel it and see
 861                 * if it was pending, in which case we need to account
 862                 * for some of the work it would have done.
 863                 */
 864                if (cancel_work_sync(&wdev->cleanup_work)) {
 865                        mutex_lock(&rdev->devlist_mtx);
 866                        rdev->opencount--;
 867                        mutex_unlock(&rdev->devlist_mtx);
 868                        dev_put(dev);
 869                }
 870                cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 871                cfg80211_lock_rdev(rdev);
 872                mutex_lock(&rdev->devlist_mtx);
 873                wdev_lock(wdev);
 874                switch (wdev->iftype) {
 875#ifdef CONFIG_CFG80211_WEXT
 876                case NL80211_IFTYPE_ADHOC:
 877                        cfg80211_ibss_wext_join(rdev, wdev);
 878                        break;
 879                case NL80211_IFTYPE_STATION:
 880                        cfg80211_mgd_wext_connect(rdev, wdev);
 881                        break;
 882#endif
 883#ifdef CONFIG_MAC80211_MESH
 884                case NL80211_IFTYPE_MESH_POINT:
 885                        {
 886                                /* backward compat code... */
 887                                struct mesh_setup setup;
 888                                memcpy(&setup, &default_mesh_setup,
 889                                                sizeof(setup));
 890                                 /* back compat only needed for mesh_id */
 891                                setup.mesh_id = wdev->ssid;
 892                                setup.mesh_id_len = wdev->mesh_id_up_len;
 893                                if (wdev->mesh_id_up_len)
 894                                        __cfg80211_join_mesh(rdev, dev,
 895                                                        &setup,
 896                                                        &default_mesh_config);
 897                                break;
 898                        }
 899#endif
 900                default:
 901                        break;
 902                }
 903                wdev_unlock(wdev);
 904                rdev->opencount++;
 905                mutex_unlock(&rdev->devlist_mtx);
 906                cfg80211_unlock_rdev(rdev);
 907
 908                /*
 909                 * Configure power management to the driver here so that its
 910                 * correctly set also after interface type changes etc.
 911                 */
 912                if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 913                     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 914                    rdev->ops->set_power_mgmt)
 915                        if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 916                                                      wdev->ps,
 917                                                      wdev->ps_timeout)) {
 918                                /* assume this means it's off */
 919                                wdev->ps = false;
 920                        }
 921                break;
 922        case NETDEV_UNREGISTER:
 923                /*
 924                 * NB: cannot take rdev->mtx here because this may be
 925                 * called within code protected by it when interfaces
 926                 * are removed with nl80211.
 927                 */
 928                mutex_lock(&rdev->devlist_mtx);
 929                /*
 930                 * It is possible to get NETDEV_UNREGISTER
 931                 * multiple times. To detect that, check
 932                 * that the interface is still on the list
 933                 * of registered interfaces, and only then
 934                 * remove and clean it up.
 935                 */
 936                if (!list_empty(&wdev->list)) {
 937                        sysfs_remove_link(&dev->dev.kobj, "phy80211");
 938                        list_del_rcu(&wdev->list);
 939                        rdev->devlist_generation++;
 940                        cfg80211_mlme_purge_registrations(wdev);
 941#ifdef CONFIG_CFG80211_WEXT
 942                        kfree(wdev->wext.keys);
 943#endif
 944                }
 945                mutex_unlock(&rdev->devlist_mtx);
 946                /*
 947                 * synchronise (so that we won't find this netdev
 948                 * from other code any more) and then clear the list
 949                 * head so that the above code can safely check for
 950                 * !list_empty() to avoid double-cleanup.
 951                 */
 952                synchronize_rcu();
 953                INIT_LIST_HEAD(&wdev->list);
 954                /*
 955                 * Ensure that all events have been processed and
 956                 * freed.
 957                 */
 958                cfg80211_process_wdev_events(wdev);
 959                break;
 960        case NETDEV_PRE_UP:
 961                if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 962                        return notifier_from_errno(-EOPNOTSUPP);
 963                if (rfkill_blocked(rdev->rfkill))
 964                        return notifier_from_errno(-ERFKILL);
 965                mutex_lock(&rdev->devlist_mtx);
 966                ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 967                mutex_unlock(&rdev->devlist_mtx);
 968                if (ret)
 969                        return notifier_from_errno(ret);
 970                break;
 971        }
 972
 973        return NOTIFY_DONE;
 974}
 975
 976static struct notifier_block cfg80211_netdev_notifier = {
 977        .notifier_call = cfg80211_netdev_notifier_call,
 978};
 979
 980static void __net_exit cfg80211_pernet_exit(struct net *net)
 981{
 982        struct cfg80211_registered_device *rdev;
 983
 984        rtnl_lock();
 985        mutex_lock(&cfg80211_mutex);
 986        list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 987                if (net_eq(wiphy_net(&rdev->wiphy), net))
 988                        WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 989        }
 990        mutex_unlock(&cfg80211_mutex);
 991        rtnl_unlock();
 992}
 993
 994static struct pernet_operations cfg80211_pernet_ops = {
 995        .exit = cfg80211_pernet_exit,
 996};
 997
 998static int __init cfg80211_init(void)
 999{
1000        int err;
1001
1002        err = register_pernet_device(&cfg80211_pernet_ops);
1003        if (err)
1004                goto out_fail_pernet;
1005
1006        err = wiphy_sysfs_init();
1007        if (err)
1008                goto out_fail_sysfs;
1009
1010        err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1011        if (err)
1012                goto out_fail_notifier;
1013
1014        err = nl80211_init();
1015        if (err)
1016                goto out_fail_nl80211;
1017
1018        ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1019
1020        err = regulatory_init();
1021        if (err)
1022                goto out_fail_reg;
1023
1024        cfg80211_wq = create_singlethread_workqueue("cfg80211");
1025        if (!cfg80211_wq)
1026                goto out_fail_wq;
1027
1028        return 0;
1029
1030out_fail_wq:
1031        regulatory_exit();
1032out_fail_reg:
1033        debugfs_remove(ieee80211_debugfs_dir);
1034out_fail_nl80211:
1035        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1036out_fail_notifier:
1037        wiphy_sysfs_exit();
1038out_fail_sysfs:
1039        unregister_pernet_device(&cfg80211_pernet_ops);
1040out_fail_pernet:
1041        return err;
1042}
1043subsys_initcall(cfg80211_init);
1044
1045static void __exit cfg80211_exit(void)
1046{
1047        debugfs_remove(ieee80211_debugfs_dir);
1048        nl80211_exit();
1049        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1050        wiphy_sysfs_exit();
1051        regulatory_exit();
1052        unregister_pernet_device(&cfg80211_pernet_ops);
1053        destroy_workqueue(cfg80211_wq);
1054}
1055module_exit(cfg80211_exit);
1056
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