net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/addrconf.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36
  37 void ieee80211_configure_filter(struct ieee80211_local *local)
  38 {
  39         u64 mc;
  40         unsigned int changed_flags;
  41         unsigned int new_flags = 0;
  42
  43         if (atomic_read(&local->iff_promiscs))
  44                 new_flags |= FIF_PROMISC_IN_BSS;
  45
  46         if (atomic_read(&local->iff_allmultis))
  47                 new_flags |= FIF_ALLMULTI;
  48
  49         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  50             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  52
  53         if (local->fif_probe_req || local->probe_req_reg)
  54                 new_flags |= FIF_PROBE_REQ;
  55
  56         if (local->fif_fcsfail)
  57                 new_flags |= FIF_FCSFAIL;
  58
  59         if (local->fif_plcpfail)
  60                 new_flags |= FIF_PLCPFAIL;
  61
  62         if (local->fif_control)
  63                 new_flags |= FIF_CONTROL;
  64
  65         if (local->fif_other_bss)
  66                 new_flags |= FIF_OTHER_BSS;
  67
  68         if (local->fif_pspoll)
  69                 new_flags |= FIF_PSPOLL;
  70
  71         spin_lock_bh(&local->filter_lock);
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         mc = drv_prepare_multicast(local, &local->mc_list);
  75         spin_unlock_bh(&local->filter_lock);
  76
  77         /* be a bit nasty */
  78         new_flags |= (1<<31);
  79
  80         drv_configure_filter(local, changed_flags, &new_flags, mc);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 static void ieee80211_reconfig_filter(struct work_struct *work)
  88 {
  89         struct ieee80211_local *local =
  90                 container_of(work, struct ieee80211_local, reconfig_filter);
  91
  92         ieee80211_configure_filter(local);
  93 }
  94
  95 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  96 {
  97         struct ieee80211_sub_if_data *sdata;
  98         struct cfg80211_chan_def chandef = {};
  99         u32 changed = 0;
 100         int power;
 101         u32 offchannel_flag;
 102
 103         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 104
 105         if (local->scan_chandef.chan) {
 106                 chandef = local->scan_chandef;
 107         } else if (local->tmp_channel) {
 108                 chandef.chan = local->tmp_channel;
 109                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 110                 chandef.center_freq1 = chandef.chan->center_freq;
 111         } else
 112                 chandef = local->_oper_chandef;
 113
 114         WARN(!cfg80211_chandef_valid(&chandef),
 115              "control:%d MHz width:%d center: %d/%d MHz",
 116              chandef.chan->center_freq, chandef.width,
 117              chandef.center_freq1, chandef.center_freq2);
 118
 119         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
 120                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 121         else
 122                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 123
 124         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 125
 126         if (offchannel_flag ||
 127             !cfg80211_chandef_identical(&local->hw.conf.chandef,
 128                                         &local->_oper_chandef)) {
 129                 local->hw.conf.chandef = chandef;
 130                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 131         }
 132
 133         if (!conf_is_ht(&local->hw.conf)) {
 134                 /*
 135                  * mac80211.h documents that this is only valid
 136                  * when the channel is set to an HT type, and
 137                  * that otherwise STATIC is used.
 138                  */
 139                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 140         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 141                 local->hw.conf.smps_mode = local->smps_mode;
 142                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 143         }
 144
 145         power = ieee80211_chandef_max_power(&chandef);
 146
 147         rcu_read_lock();
 148         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 149                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 150                         continue;
 151                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 152                         continue;
 153                 power = min(power, sdata->vif.bss_conf.txpower);
 154         }
 155         rcu_read_unlock();
 156
 157         if (local->hw.conf.power_level != power) {
 158                 changed |= IEEE80211_CONF_CHANGE_POWER;
 159                 local->hw.conf.power_level = power;
 160         }
 161
 162         return changed;
 163 }
 164
 165 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 166 {
 167         int ret = 0;
 168
 169         might_sleep();
 170
 171         if (!local->use_chanctx)
 172                 changed |= ieee80211_hw_conf_chan(local);
 173         else
 174                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 175                              IEEE80211_CONF_CHANGE_POWER);
 176
 177         if (changed && local->open_count) {
 178                 ret = drv_config(local, changed);
 179                 /*
 180                  * Goal:
 181                  * HW reconfiguration should never fail, the driver has told
 182                  * us what it can support so it should live up to that promise.
 183                  *
 184                  * Current status:
 185                  * rfkill is not integrated with mac80211 and a
 186                  * configuration command can thus fail if hardware rfkill
 187                  * is enabled
 188                  *
 189                  * FIXME: integrate rfkill with mac80211 and then add this
 190                  * WARN_ON() back
 191                  *
 192                  */
 193                 /* WARN_ON(ret); */
 194         }
 195
 196         return ret;
 197 }
 198
 199 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 200                                       u32 changed)
 201 {
 202         struct ieee80211_local *local = sdata->local;
 203
 204         if (!changed)
 205                 return;
 206
 207         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 208 }
 209
 210 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 211 {
 212         sdata->vif.bss_conf.use_cts_prot = false;
 213         sdata->vif.bss_conf.use_short_preamble = false;
 214         sdata->vif.bss_conf.use_short_slot = false;
 215         return BSS_CHANGED_ERP_CTS_PROT |
 216                BSS_CHANGED_ERP_PREAMBLE |
 217                BSS_CHANGED_ERP_SLOT;
 218 }
 219
 220 static void ieee80211_tasklet_handler(unsigned long data)
 221 {
 222         struct ieee80211_local *local = (struct ieee80211_local *) data;
 223         struct sk_buff *skb;
 224
 225         while ((skb = skb_dequeue(&local->skb_queue)) ||
 226                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 227                 switch (skb->pkt_type) {
 228                 case IEEE80211_RX_MSG:
 229                         /* Clear skb->pkt_type in order to not confuse kernel
 230                          * netstack. */
 231                         skb->pkt_type = 0;
 232                         ieee80211_rx(&local->hw, skb);
 233                         break;
 234                 case IEEE80211_TX_STATUS_MSG:
 235                         skb->pkt_type = 0;
 236                         ieee80211_tx_status(&local->hw, skb);
 237                         break;
 238                 default:
 239                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 240                              skb->pkt_type);
 241                         dev_kfree_skb(skb);
 242                         break;
 243                 }
 244         }
 245 }
 246
 247 static void ieee80211_restart_work(struct work_struct *work)
 248 {
 249         struct ieee80211_local *local =
 250                 container_of(work, struct ieee80211_local, restart_work);
 251
 252         /* wait for scan work complete */
 253         flush_workqueue(local->workqueue);
 254
 255         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 256              "%s called with hardware scan in progress\n", __func__);
 257
 258         rtnl_lock();
 259         ieee80211_scan_cancel(local);
 260         ieee80211_reconfig(local);
 261         rtnl_unlock();
 262 }
 263
 264 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 265 {
 266         struct ieee80211_local *local = hw_to_local(hw);
 267
 268         trace_api_restart_hw(local);
 269
 270         wiphy_info(hw->wiphy,
 271                    "Hardware restart was requested\n");
 272
 273         /* use this reason, ieee80211_reconfig will unblock it */
 274         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 275                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 276
 277         /*
 278          * Stop all Rx during the reconfig. We don't want state changes
 279          * or driver callbacks while this is in progress.
 280          */
 281         local->in_reconfig = true;
 282         barrier();
 283
 284         schedule_work(&local->restart_work);
 285 }
 286 EXPORT_SYMBOL(ieee80211_restart_hw);
 287
 288 #ifdef CONFIG_INET
 289 static int ieee80211_ifa_changed(struct notifier_block *nb,
 290                                  unsigned long data, void *arg)
 291 {
 292         struct in_ifaddr *ifa = arg;
 293         struct ieee80211_local *local =
 294                 container_of(nb, struct ieee80211_local,
 295                              ifa_notifier);
 296         struct net_device *ndev = ifa->ifa_dev->dev;
 297         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 298         struct in_device *idev;
 299         struct ieee80211_sub_if_data *sdata;
 300         struct ieee80211_bss_conf *bss_conf;
 301         struct ieee80211_if_managed *ifmgd;
 302         int c = 0;
 303
 304         /* Make sure it's our interface that got changed */
 305         if (!wdev)
 306                 return NOTIFY_DONE;
 307
 308         if (wdev->wiphy != local->hw.wiphy)
 309                 return NOTIFY_DONE;
 310
 311         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 312         bss_conf = &sdata->vif.bss_conf;
 313
 314         /* ARP filtering is only supported in managed mode */
 315         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 316                 return NOTIFY_DONE;
 317
 318         idev = __in_dev_get_rtnl(sdata->dev);
 319         if (!idev)
 320                 return NOTIFY_DONE;
 321
 322         ifmgd = &sdata->u.mgd;
 323         sdata_lock(sdata);
 324
 325         /* Copy the addresses to the bss_conf list */
 326         ifa = idev->ifa_list;
 327         while (ifa) {
 328                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 329                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 330                 ifa = ifa->ifa_next;
 331                 c++;
 332         }
 333
 334         bss_conf->arp_addr_cnt = c;
 335
 336         /* Configure driver only if associated (which also implies it is up) */
 337         if (ifmgd->associated)
 338                 ieee80211_bss_info_change_notify(sdata,
 339                                                  BSS_CHANGED_ARP_FILTER);
 340
 341         sdata_unlock(sdata);
 342
 343         return NOTIFY_DONE;
 344 }
 345 #endif
 346
 347 #if IS_ENABLED(CONFIG_IPV6)
 348 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 349                                   unsigned long data, void *arg)
 350 {
 351         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 352         struct inet6_dev *idev = ifa->idev;
 353         struct net_device *ndev = ifa->idev->dev;
 354         struct ieee80211_local *local =
 355                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 356         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 357         struct ieee80211_sub_if_data *sdata;
 358
 359         /* Make sure it's our interface that got changed */
 360         if (!wdev || wdev->wiphy != local->hw.wiphy)
 361                 return NOTIFY_DONE;
 362
 363         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 364
 365         /*
 366          * For now only support station mode. This is mostly because
 367          * doing AP would have to handle AP_VLAN in some way ...
 368          */
 369         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 370                 return NOTIFY_DONE;
 371
 372         drv_ipv6_addr_change(local, sdata, idev);
 373
 374         return NOTIFY_DONE;
 375 }
 376 #endif
 377
 378 /* There isn't a lot of sense in it, but you can transmit anything you like */
 379 static const struct ieee80211_txrx_stypes
 380 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 381         [NL80211_IFTYPE_ADHOC] = {
 382                 .tx = 0xffff,
 383                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 384                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 385                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 386                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 387         },
 388         [NL80211_IFTYPE_STATION] = {
 389                 .tx = 0xffff,
 390                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 391                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 392         },
 393         [NL80211_IFTYPE_AP] = {
 394                 .tx = 0xffff,
 395                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 396                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 398                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 399                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 400                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 401                         BIT(IEEE80211_STYPE_ACTION >> 4),
 402         },
 403         [NL80211_IFTYPE_AP_VLAN] = {
 404                 /* copy AP */
 405                 .tx = 0xffff,
 406                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 407                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 408                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 409                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 410                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 411                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 412                         BIT(IEEE80211_STYPE_ACTION >> 4),
 413         },
 414         [NL80211_IFTYPE_P2P_CLIENT] = {
 415                 .tx = 0xffff,
 416                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 417                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 418         },
 419         [NL80211_IFTYPE_P2P_GO] = {
 420                 .tx = 0xffff,
 421                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 422                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 423                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 424                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 425                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 426                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 427                         BIT(IEEE80211_STYPE_ACTION >> 4),
 428         },
 429         [NL80211_IFTYPE_MESH_POINT] = {
 430                 .tx = 0xffff,
 431                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 432                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 433                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 434         },
 435         [NL80211_IFTYPE_P2P_DEVICE] = {
 436                 .tx = 0xffff,
 437                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 438                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 439         },
 440 };
 441
 442 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 443         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 444                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 445
 446         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 447                                 IEEE80211_HT_CAP_MAX_AMSDU |
 448                                 IEEE80211_HT_CAP_SGI_20 |
 449                                 IEEE80211_HT_CAP_SGI_40),
 450         .mcs = {
 451                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 452                              0xff, 0xff, 0xff, 0xff, 0xff, },
 453         },
 454 };
 455
 456 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 457         .vht_cap_info =
 458                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 459                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 460                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 461                             IEEE80211_VHT_CAP_RXSTBC_1 |
 462                             IEEE80211_VHT_CAP_RXSTBC_2 |
 463                             IEEE80211_VHT_CAP_RXSTBC_3 |
 464                             IEEE80211_VHT_CAP_RXSTBC_4 |
 465                             IEEE80211_VHT_CAP_TXSTBC |
 466                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 467                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 468                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 469                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 470                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 471         .supp_mcs = {
 472                 .rx_mcs_map = cpu_to_le16(~0),
 473                 .tx_mcs_map = cpu_to_le16(~0),
 474         },
 475 };
 476
 477 static const u8 extended_capabilities[] = {
 478         0, 0, 0, 0, 0, 0, 0,
 479         WLAN_EXT_CAPA8_OPMODE_NOTIF,
 480 };
 481
 482 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 483                                         const struct ieee80211_ops *ops)
 484 {
 485         struct ieee80211_local *local;
 486         int priv_size, i;
 487         struct wiphy *wiphy;
 488         bool use_chanctx;
 489
 490         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 491                     !ops->add_interface || !ops->remove_interface ||
 492                     !ops->configure_filter))
 493                 return NULL;
 494
 495         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 496                 return NULL;
 497
 498         /* check all or no channel context operations exist */
 499         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 500             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 501             !!ops->unassign_vif_chanctx;
 502         if (WARN_ON(i != 0 && i != 5))
 503                 return NULL;
 504         use_chanctx = i == 5;
 505
 506         /* Ensure 32-byte alignment of our private data and hw private data.
 507          * We use the wiphy priv data for both our ieee80211_local and for
 508          * the driver's private data
 509          *
 510          * In memory it'll be like this:
 511          *
 512          * +-------------------------+
 513          * | struct wiphy           |
 514          * +-------------------------+
 515          * | struct ieee80211_local  |
 516          * +-------------------------+
 517          * | driver's private data   |
 518          * +-------------------------+
 519          *
 520          */
 521         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 522
 523         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 524
 525         if (!wiphy)
 526                 return NULL;
 527
 528         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 529
 530         wiphy->privid = mac80211_wiphy_privid;
 531
 532         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 533                         WIPHY_FLAG_4ADDR_AP |
 534                         WIPHY_FLAG_4ADDR_STATION |
 535                         WIPHY_FLAG_REPORTS_OBSS |
 536                         WIPHY_FLAG_OFFCHAN_TX;
 537
 538         wiphy->extended_capabilities = extended_capabilities;
 539         wiphy->extended_capabilities_mask = extended_capabilities;
 540         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
 541
 542         if (ops->remain_on_channel)
 543                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 544
 545         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 546                            NL80211_FEATURE_SAE |
 547                            NL80211_FEATURE_HT_IBSS |
 548                            NL80211_FEATURE_VIF_TXPOWER |
 549                            NL80211_FEATURE_USERSPACE_MPM;
 550
 551         if (!ops->hw_scan)
 552                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 553                                    NL80211_FEATURE_AP_SCAN;
 554
 555
 556         if (!ops->set_key)
 557                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 558
 559         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 560
 561         local = wiphy_priv(wiphy);
 562
 563         local->hw.wiphy = wiphy;
 564
 565         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 566
 567         local->ops = ops;
 568         local->use_chanctx = use_chanctx;
 569
 570         /* set up some defaults */
 571         local->hw.queues = 1;
 572         local->hw.max_rates = 1;
 573         local->hw.max_report_rates = 0;
 574         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 575         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 576         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 577         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 578         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 579         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 580                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 581                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 582         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 583                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 584         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 585         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 586         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 587         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 588         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 589
 590         INIT_LIST_HEAD(&local->interfaces);
 591
 592         __hw_addr_init(&local->mc_list);
 593
 594         mutex_init(&local->iflist_mtx);
 595         mutex_init(&local->mtx);
 596
 597         mutex_init(&local->key_mtx);
 598         spin_lock_init(&local->filter_lock);
 599         spin_lock_init(&local->rx_path_lock);
 600         spin_lock_init(&local->queue_stop_reason_lock);
 601
 602         INIT_LIST_HEAD(&local->chanctx_list);
 603         mutex_init(&local->chanctx_mtx);
 604
 605         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 606
 607         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 608
 609         INIT_WORK(&local->radar_detected_work,
 610                   ieee80211_dfs_radar_detected_work);
 611
 612         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 613         local->smps_mode = IEEE80211_SMPS_OFF;
 614
 615         INIT_WORK(&local->dynamic_ps_enable_work,
 616                   ieee80211_dynamic_ps_enable_work);
 617         INIT_WORK(&local->dynamic_ps_disable_work,
 618                   ieee80211_dynamic_ps_disable_work);
 619         setup_timer(&local->dynamic_ps_timer,
 620                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 621
 622         INIT_WORK(&local->sched_scan_stopped_work,
 623                   ieee80211_sched_scan_stopped_work);
 624
 625         spin_lock_init(&local->ack_status_lock);
 626         idr_init(&local->ack_status_frames);
 627
 628         sta_info_init(local);
 629
 630         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 631                 skb_queue_head_init(&local->pending[i]);
 632                 atomic_set(&local->agg_queue_stop[i], 0);
 633         }
 634         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 635                      (unsigned long)local);
 636
 637         tasklet_init(&local->tasklet,
 638                      ieee80211_tasklet_handler,
 639                      (unsigned long) local);
 640
 641         skb_queue_head_init(&local->skb_queue);
 642         skb_queue_head_init(&local->skb_queue_unreliable);
 643
 644         ieee80211_led_names(local);
 645
 646         ieee80211_roc_setup(local);
 647
 648         return &local->hw;
 649 }
 650 EXPORT_SYMBOL(ieee80211_alloc_hw);
 651
 652 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 653 {
 654         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
 655                           IS_ERR(local->wep_rx_tfm));
 656         bool have_mfp = local->hw.flags & IEEE80211_HW_MFP_CAPABLE;
 657         const struct ieee80211_cipher_scheme *cs = local->hw.cipher_schemes;
 658         int n_suites = 0, r = 0, w = 0;
 659         u32 *suites;
 660         static const u32 cipher_suites[] = {
 661                 /* keep WEP first, it may be removed below */
 662                 WLAN_CIPHER_SUITE_WEP40,
 663                 WLAN_CIPHER_SUITE_WEP104,
 664                 WLAN_CIPHER_SUITE_TKIP,
 665                 WLAN_CIPHER_SUITE_CCMP,
 666
 667                 /* keep last -- depends on hw flags! */
 668                 WLAN_CIPHER_SUITE_AES_CMAC
 669         };
 670
 671         /* Driver specifies the ciphers, we have nothing to do... */
 672         if (local->hw.wiphy->cipher_suites && have_wep)
 673                 return 0;
 674
 675         /* Set up cipher suites if driver relies on mac80211 cipher defs */
 676         if (!local->hw.wiphy->cipher_suites && !cs) {
 677                 local->hw.wiphy->cipher_suites = cipher_suites;
 678                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 679
 680                 if (!have_mfp)
 681                         local->hw.wiphy->n_cipher_suites--;
 682
 683                 if (!have_wep) {
 684                         local->hw.wiphy->cipher_suites += 2;
 685                         local->hw.wiphy->n_cipher_suites -= 2;
 686                 }
 687
 688                 return 0;
 689         }
 690
 691         if (!local->hw.wiphy->cipher_suites) {
 692                 /*
 693                  * Driver specifies cipher schemes only
 694                  * We start counting ciphers defined by schemes, TKIP and CCMP
 695                  */
 696                 n_suites = local->hw.n_cipher_schemes + 2;
 697
 698                 /* check if we have WEP40 and WEP104 */
 699                 if (have_wep)
 700                         n_suites += 2;
 701
 702                 /* check if we have AES_CMAC */
 703                 if (have_mfp)
 704                         n_suites++;
 705
 706                 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
 707                 if (!suites)
 708                         return -ENOMEM;
 709
 710                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 711                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 712
 713                 if (have_wep) {
 714                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 715                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 716                 }
 717
 718                 if (have_mfp)
 719                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 720
 721                 for (r = 0; r < local->hw.n_cipher_schemes; r++)
 722                         suites[w++] = cs[r].cipher;
 723         } else {
 724                 /* Driver provides cipher suites, but we need to exclude WEP */
 725                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 726                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 727                                  GFP_KERNEL);
 728                 if (!suites)
 729                         return -ENOMEM;
 730
 731                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 732                         u32 suite = local->hw.wiphy->cipher_suites[r];
 733
 734                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 735                             suite == WLAN_CIPHER_SUITE_WEP104)
 736                                 continue;
 737                         suites[w++] = suite;
 738                 }
 739         }
 740
 741         local->hw.wiphy->cipher_suites = suites;
 742         local->hw.wiphy->n_cipher_suites = w;
 743         local->wiphy_ciphers_allocated = true;
 744
 745         return 0;
 746 }
 747
 748 int ieee80211_register_hw(struct ieee80211_hw *hw)
 749 {
 750         struct ieee80211_local *local = hw_to_local(hw);
 751         int result, i;
 752         enum ieee80211_band band;
 753         int channels, max_bitrates;
 754         bool supp_ht, supp_vht;
 755         netdev_features_t feature_whitelist;
 756         struct cfg80211_chan_def dflt_chandef = {};
 757
 758         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 759             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 760              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 761                 return -EINVAL;
 762
 763 #ifdef CONFIG_PM
 764         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 765                 return -EINVAL;
 766 #endif
 767
 768         if (!local->use_chanctx) {
 769                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 770                         const struct ieee80211_iface_combination *comb;
 771
 772                         comb = &local->hw.wiphy->iface_combinations[i];
 773
 774                         if (comb->num_different_channels > 1)
 775                                 return -EINVAL;
 776                 }
 777         } else {
 778                 /*
 779                  * WDS is currently prohibited when channel contexts are used
 780                  * because there's no clear definition of which channel WDS
 781                  * type interfaces use
 782                  */
 783                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 784                         return -EINVAL;
 785
 786                 /* DFS currently not supported with channel context drivers */
 787                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 788                         const struct ieee80211_iface_combination *comb;
 789
 790                         comb = &local->hw.wiphy->iface_combinations[i];
 791
 792                         if (comb->radar_detect_widths)
 793                                 return -EINVAL;
 794                 }
 795         }
 796
 797         /* Only HW csum features are currently compatible with mac80211 */
 798         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 799                             NETIF_F_HW_CSUM;
 800         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 801                 return -EINVAL;
 802
 803         if (hw->max_report_rates == 0)
 804                 hw->max_report_rates = hw->max_rates;
 805
 806         local->rx_chains = 1;
 807
 808         /*
 809          * generic code guarantees at least one band,
 810          * set this very early because much code assumes
 811          * that hw.conf.channel is assigned
 812          */
 813         channels = 0;
 814         max_bitrates = 0;
 815         supp_ht = false;
 816         supp_vht = false;
 817         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 818                 struct ieee80211_supported_band *sband;
 819
 820                 sband = local->hw.wiphy->bands[band];
 821                 if (!sband)
 822                         continue;
 823
 824                 if (!dflt_chandef.chan) {
 825                         cfg80211_chandef_create(&dflt_chandef,
 826                                                 &sband->channels[0],
 827                                                 NL80211_CHAN_NO_HT);
 828                         /* init channel we're on */
 829                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 830                                 local->hw.conf.chandef = dflt_chandef;
 831                                 local->_oper_chandef = dflt_chandef;
 832                         }
 833                         local->monitor_chandef = dflt_chandef;
 834                 }
 835
 836                 channels += sband->n_channels;
 837
 838                 if (max_bitrates < sband->n_bitrates)
 839                         max_bitrates = sband->n_bitrates;
 840                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 841                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 842
 843                 if (sband->ht_cap.ht_supported)
 844                         local->rx_chains =
 845                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 846                                     local->rx_chains);
 847
 848                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 849         }
 850
 851         /* if low-level driver supports AP, we also support VLAN */
 852         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 853                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 854                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 855         }
 856
 857         /* mac80211 always supports monitor */
 858         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 859         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 860
 861         /* mac80211 doesn't support more than one IBSS interface right now */
 862         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 863                 const struct ieee80211_iface_combination *c;
 864                 int j;
 865
 866                 c = &hw->wiphy->iface_combinations[i];
 867
 868                 for (j = 0; j < c->n_limits; j++)
 869                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 870                             c->limits[j].max > 1)
 871                                 return -EINVAL;
 872         }
 873
 874         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 875                                       sizeof(void *) * channels, GFP_KERNEL);
 876         if (!local->int_scan_req)
 877                 return -ENOMEM;
 878
 879         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 880                 if (!local->hw.wiphy->bands[band])
 881                         continue;
 882                 local->int_scan_req->rates[band] = (u32) -1;
 883         }
 884
 885 #ifndef CONFIG_MAC80211_MESH
 886         /* mesh depends on Kconfig, but drivers should set it if they want */
 887         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 888 #endif
 889
 890         /* if the underlying driver supports mesh, mac80211 will (at least)
 891          * provide routing of mesh authentication frames to userspace */
 892         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 893                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 894
 895         /* mac80211 supports control port protocol changing */
 896         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 897
 898         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 899                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 900         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 901                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 902
 903         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 904              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 905              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 906
 907         /*
 908          * Calculate scan IE length -- we need this to alloc
 909          * memory and to subtract from the driver limit. It
 910          * includes the DS Params, (extended) supported rates, and HT
 911          * information -- SSID is the driver's responsibility.
 912          */
 913         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 914                 3 /* DS Params */;
 915         if (supp_ht)
 916                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 917
 918         if (supp_vht)
 919                 local->scan_ies_len +=
 920                         2 + sizeof(struct ieee80211_vht_cap);
 921
 922         if (!local->ops->hw_scan) {
 923                 /* For hw_scan, driver needs to set these up. */
 924                 local->hw.wiphy->max_scan_ssids = 4;
 925                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 926         }
 927
 928         /*
 929          * If the driver supports any scan IEs, then assume the
 930          * limit includes the IEs mac80211 will add, otherwise
 931          * leave it at zero and let the driver sort it out; we
 932          * still pass our IEs to the driver but userspace will
 933          * not be allowed to in that case.
 934          */
 935         if (local->hw.wiphy->max_scan_ie_len)
 936                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 937
 938         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
 939                                          local->hw.n_cipher_schemes));
 940
 941         result = ieee80211_init_cipher_suites(local);
 942         if (result < 0)
 943                 goto fail_wiphy_register;
 944
 945         if (!local->ops->remain_on_channel)
 946                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 947
 948         /* mac80211 based drivers don't support internal TDLS setup */
 949         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 950                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 951
 952         result = wiphy_register(local->hw.wiphy);
 953         if (result < 0)
 954                 goto fail_wiphy_register;
 955
 956         /*
 957          * We use the number of queues for feature tests (QoS, HT) internally
 958          * so restrict them appropriately.
 959          */
 960         if (hw->queues > IEEE80211_MAX_QUEUES)
 961                 hw->queues = IEEE80211_MAX_QUEUES;
 962
 963         local->workqueue =
 964                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
 965         if (!local->workqueue) {
 966                 result = -ENOMEM;
 967                 goto fail_workqueue;
 968         }
 969
 970         /*
 971          * The hardware needs headroom for sending the frame,
 972          * and we need some headroom for passing the frame to monitor
 973          * interfaces, but never both at the same time.
 974          */
 975         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 976                                    IEEE80211_TX_STATUS_HEADROOM);
 977
 978         debugfs_hw_add(local);
 979
 980         /*
 981          * if the driver doesn't specify a max listen interval we
 982          * use 5 which should be a safe default
 983          */
 984         if (local->hw.max_listen_interval == 0)
 985                 local->hw.max_listen_interval = 5;
 986
 987         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 988
 989         local->dynamic_ps_forced_timeout = -1;
 990
 991         result = ieee80211_wep_init(local);
 992         if (result < 0)
 993                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 994                             result);
 995
 996         local->hw.conf.flags = IEEE80211_CONF_IDLE;
 997
 998         ieee80211_led_init(local);
 999
1000         rtnl_lock();
1001
1002         result = ieee80211_init_rate_ctrl_alg(local,
1003                                               hw->rate_control_algorithm);
1004         if (result < 0) {
1005                 wiphy_debug(local->hw.wiphy,
1006                             "Failed to initialize rate control algorithm\n");
1007                 goto fail_rate;
1008         }
1009
1010         /* add one default STA interface if supported */
1011         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1012                 result = ieee80211_if_add(local, "wlan%d", NULL,
1013                                           NL80211_IFTYPE_STATION, NULL);
1014                 if (result)
1015                         wiphy_warn(local->hw.wiphy,
1016                                    "Failed to add default virtual iface\n");
1017         }
1018
1019         rtnl_unlock();
1020
1021         local->network_latency_notifier.notifier_call =
1022                 ieee80211_max_network_latency;
1023         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1024                                      &local->network_latency_notifier);
1025         if (result) {
1026                 rtnl_lock();
1027                 goto fail_pm_qos;
1028         }
1029
1030 #ifdef CONFIG_INET
1031         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1032         result = register_inetaddr_notifier(&local->ifa_notifier);
1033         if (result)
1034                 goto fail_ifa;
1035 #endif
1036
1037 #if IS_ENABLED(CONFIG_IPV6)
1038         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1039         result = register_inet6addr_notifier(&local->ifa6_notifier);
1040         if (result)
1041                 goto fail_ifa6;
1042 #endif
1043
1044         return 0;
1045
1046 #if IS_ENABLED(CONFIG_IPV6)
1047  fail_ifa6:
1048 #ifdef CONFIG_INET
1049         unregister_inetaddr_notifier(&local->ifa_notifier);
1050 #endif
1051 #endif
1052 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1053  fail_ifa:
1054         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1055                                &local->network_latency_notifier);
1056         rtnl_lock();
1057 #endif
1058  fail_pm_qos:
1059         ieee80211_led_exit(local);
1060         ieee80211_remove_interfaces(local);
1061  fail_rate:
1062         rtnl_unlock();
1063         ieee80211_wep_free(local);
1064         sta_info_stop(local);
1065         destroy_workqueue(local->workqueue);
1066  fail_workqueue:
1067         wiphy_unregister(local->hw.wiphy);
1068  fail_wiphy_register:
1069         if (local->wiphy_ciphers_allocated)
1070                 kfree(local->hw.wiphy->cipher_suites);
1071         kfree(local->int_scan_req);
1072         return result;
1073 }
1074 EXPORT_SYMBOL(ieee80211_register_hw);
1075
1076 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1077 {
1078         struct ieee80211_local *local = hw_to_local(hw);
1079
1080         tasklet_kill(&local->tx_pending_tasklet);
1081         tasklet_kill(&local->tasklet);
1082
1083         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1084                                &local->network_latency_notifier);
1085 #ifdef CONFIG_INET
1086         unregister_inetaddr_notifier(&local->ifa_notifier);
1087 #endif
1088 #if IS_ENABLED(CONFIG_IPV6)
1089         unregister_inet6addr_notifier(&local->ifa6_notifier);
1090 #endif
1091
1092         rtnl_lock();
1093
1094         /*
1095          * At this point, interface list manipulations are fine
1096          * because the driver cannot be handing us frames any
1097          * more and the tasklet is killed.
1098          */
1099         ieee80211_remove_interfaces(local);
1100
1101         rtnl_unlock();
1102
1103         cancel_work_sync(&local->restart_work);
1104         cancel_work_sync(&local->reconfig_filter);
1105         flush_work(&local->sched_scan_stopped_work);
1106
1107         ieee80211_clear_tx_pending(local);
1108         rate_control_deinitialize(local);
1109
1110         if (skb_queue_len(&local->skb_queue) ||
1111             skb_queue_len(&local->skb_queue_unreliable))
1112                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1113         skb_queue_purge(&local->skb_queue);
1114         skb_queue_purge(&local->skb_queue_unreliable);
1115
1116         destroy_workqueue(local->workqueue);
1117         wiphy_unregister(local->hw.wiphy);
1118         sta_info_stop(local);
1119         ieee80211_wep_free(local);
1120         ieee80211_led_exit(local);
1121         kfree(local->int_scan_req);
1122 }
1123 EXPORT_SYMBOL(ieee80211_unregister_hw);
1124
1125 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1126 {
1127         WARN_ONCE(1, "Have pending ack frames!\n");
1128         kfree_skb(p);
1129         return 0;
1130 }
1131
1132 void ieee80211_free_hw(struct ieee80211_hw *hw)
1133 {
1134         struct ieee80211_local *local = hw_to_local(hw);
1135
1136         mutex_destroy(&local->iflist_mtx);
1137         mutex_destroy(&local->mtx);
1138
1139         if (local->wiphy_ciphers_allocated)
1140                 kfree(local->hw.wiphy->cipher_suites);
1141
1142         idr_for_each(&local->ack_status_frames,
1143                      ieee80211_free_ack_frame, NULL);
1144         idr_destroy(&local->ack_status_frames);
1145
1146         kfree(rcu_access_pointer(local->tx_latency));
1147
1148         wiphy_free(local->hw.wiphy);
1149 }
1150 EXPORT_SYMBOL(ieee80211_free_hw);
1151
1152 static int __init ieee80211_init(void)
1153 {
1154         struct sk_buff *skb;
1155         int ret;
1156
1157         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1158         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1159                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1160
1161         ret = rc80211_minstrel_init();
1162         if (ret)
1163                 return ret;
1164
1165         ret = rc80211_minstrel_ht_init();
1166         if (ret)
1167                 goto err_minstrel;
1168
1169         ret = rc80211_pid_init();
1170         if (ret)
1171                 goto err_pid;
1172
1173         ret = ieee80211_iface_init();
1174         if (ret)
1175                 goto err_netdev;
1176
1177         return 0;
1178  err_netdev:
1179         rc80211_pid_exit();
1180  err_pid:
1181         rc80211_minstrel_ht_exit();
1182  err_minstrel:
1183         rc80211_minstrel_exit();
1184
1185         return ret;
1186 }
1187
1188 static void __exit ieee80211_exit(void)
1189 {
1190         rc80211_pid_exit();
1191         rc80211_minstrel_ht_exit();
1192         rc80211_minstrel_exit();
1193
1194         ieee80211s_stop();
1195
1196         ieee80211_iface_exit();
1197
1198         rcu_barrier();
1199 }
1200
1201
1202 subsys_initcall(ieee80211_init);
1203 module_exit(ieee80211_exit);
1204
1205 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1206 MODULE_LICENSE("GPL");