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_channel) {
 106                 chandef.chan = local->scan_channel;
 107                 /* If scanning on oper channel, use whatever channel-type
 108                  * is currently in use.
 109                  */
 110                 if (chandef.chan == local->_oper_chandef.chan) {
 111                         chandef = local->_oper_chandef;
 112                 } else {
 113                         chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 114                         chandef.center_freq1 = chandef.chan->center_freq;
 115                 }
 116         } else if (local->tmp_channel) {
 117                 chandef.chan = local->tmp_channel;
 118                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 119                 chandef.center_freq1 = chandef.chan->center_freq;
 120         } else
 121                 chandef = local->_oper_chandef;
 122
 123         WARN(!cfg80211_chandef_valid(&chandef),
 124              "control:%d MHz width:%d center: %d/%d MHz",
 125              chandef.chan->center_freq, chandef.width,
 126              chandef.center_freq1, chandef.center_freq2);
 127
 128         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
 129                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 130         else
 131                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 132
 133         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 134
 135         if (offchannel_flag ||
 136             !cfg80211_chandef_identical(&local->hw.conf.chandef,
 137                                         &local->_oper_chandef)) {
 138                 local->hw.conf.chandef = chandef;
 139                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 140         }
 141
 142         if (!conf_is_ht(&local->hw.conf)) {
 143                 /*
 144                  * mac80211.h documents that this is only valid
 145                  * when the channel is set to an HT type, and
 146                  * that otherwise STATIC is used.
 147                  */
 148                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 149         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 150                 local->hw.conf.smps_mode = local->smps_mode;
 151                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 152         }
 153
 154         power = chandef.chan->max_power;
 155
 156         rcu_read_lock();
 157         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 158                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 159                         continue;
 160                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 161                         continue;
 162                 power = min(power, sdata->vif.bss_conf.txpower);
 163         }
 164         rcu_read_unlock();
 165
 166         if (local->hw.conf.power_level != power) {
 167                 changed |= IEEE80211_CONF_CHANGE_POWER;
 168                 local->hw.conf.power_level = power;
 169         }
 170
 171         return changed;
 172 }
 173
 174 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 175 {
 176         int ret = 0;
 177
 178         might_sleep();
 179
 180         if (!local->use_chanctx)
 181                 changed |= ieee80211_hw_conf_chan(local);
 182         else
 183                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 184                              IEEE80211_CONF_CHANGE_POWER);
 185
 186         if (changed && local->open_count) {
 187                 ret = drv_config(local, changed);
 188                 /*
 189                  * Goal:
 190                  * HW reconfiguration should never fail, the driver has told
 191                  * us what it can support so it should live up to that promise.
 192                  *
 193                  * Current status:
 194                  * rfkill is not integrated with mac80211 and a
 195                  * configuration command can thus fail if hardware rfkill
 196                  * is enabled
 197                  *
 198                  * FIXME: integrate rfkill with mac80211 and then add this
 199                  * WARN_ON() back
 200                  *
 201                  */
 202                 /* WARN_ON(ret); */
 203         }
 204
 205         return ret;
 206 }
 207
 208 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 209                                       u32 changed)
 210 {
 211         struct ieee80211_local *local = sdata->local;
 212
 213         if (!changed)
 214                 return;
 215
 216         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 217 }
 218
 219 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 220 {
 221         sdata->vif.bss_conf.use_cts_prot = false;
 222         sdata->vif.bss_conf.use_short_preamble = false;
 223         sdata->vif.bss_conf.use_short_slot = false;
 224         return BSS_CHANGED_ERP_CTS_PROT |
 225                BSS_CHANGED_ERP_PREAMBLE |
 226                BSS_CHANGED_ERP_SLOT;
 227 }
 228
 229 static void ieee80211_tasklet_handler(unsigned long data)
 230 {
 231         struct ieee80211_local *local = (struct ieee80211_local *) data;
 232         struct sk_buff *skb;
 233
 234         while ((skb = skb_dequeue(&local->skb_queue)) ||
 235                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 236                 switch (skb->pkt_type) {
 237                 case IEEE80211_RX_MSG:
 238                         /* Clear skb->pkt_type in order to not confuse kernel
 239                          * netstack. */
 240                         skb->pkt_type = 0;
 241                         ieee80211_rx(&local->hw, skb);
 242                         break;
 243                 case IEEE80211_TX_STATUS_MSG:
 244                         skb->pkt_type = 0;
 245                         ieee80211_tx_status(&local->hw, skb);
 246                         break;
 247                 default:
 248                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 249                              skb->pkt_type);
 250                         dev_kfree_skb(skb);
 251                         break;
 252                 }
 253         }
 254 }
 255
 256 static void ieee80211_restart_work(struct work_struct *work)
 257 {
 258         struct ieee80211_local *local =
 259                 container_of(work, struct ieee80211_local, restart_work);
 260         struct ieee80211_sub_if_data *sdata;
 261
 262         /* wait for scan work complete */
 263         flush_workqueue(local->workqueue);
 264
 265         mutex_lock(&local->mtx);
 266         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 267              rcu_dereference_protected(local->sched_scan_sdata,
 268                                        lockdep_is_held(&local->mtx)),
 269                 "%s called with hardware scan in progress\n", __func__);
 270         mutex_unlock(&local->mtx);
 271
 272         rtnl_lock();
 273         list_for_each_entry(sdata, &local->interfaces, list)
 274                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 275         ieee80211_scan_cancel(local);
 276         ieee80211_reconfig(local);
 277         rtnl_unlock();
 278 }
 279
 280 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 281 {
 282         struct ieee80211_local *local = hw_to_local(hw);
 283
 284         trace_api_restart_hw(local);
 285
 286         wiphy_info(hw->wiphy,
 287                    "Hardware restart was requested\n");
 288
 289         /* use this reason, ieee80211_reconfig will unblock it */
 290         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 291                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 292
 293         /*
 294          * Stop all Rx during the reconfig. We don't want state changes
 295          * or driver callbacks while this is in progress.
 296          */
 297         local->in_reconfig = true;
 298         barrier();
 299
 300         schedule_work(&local->restart_work);
 301 }
 302 EXPORT_SYMBOL(ieee80211_restart_hw);
 303
 304 #ifdef CONFIG_INET
 305 static int ieee80211_ifa_changed(struct notifier_block *nb,
 306                                  unsigned long data, void *arg)
 307 {
 308         struct in_ifaddr *ifa = arg;
 309         struct ieee80211_local *local =
 310                 container_of(nb, struct ieee80211_local,
 311                              ifa_notifier);
 312         struct net_device *ndev = ifa->ifa_dev->dev;
 313         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 314         struct in_device *idev;
 315         struct ieee80211_sub_if_data *sdata;
 316         struct ieee80211_bss_conf *bss_conf;
 317         struct ieee80211_if_managed *ifmgd;
 318         int c = 0;
 319
 320         /* Make sure it's our interface that got changed */
 321         if (!wdev)
 322                 return NOTIFY_DONE;
 323
 324         if (wdev->wiphy != local->hw.wiphy)
 325                 return NOTIFY_DONE;
 326
 327         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 328         bss_conf = &sdata->vif.bss_conf;
 329
 330         /* ARP filtering is only supported in managed mode */
 331         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 332                 return NOTIFY_DONE;
 333
 334         idev = __in_dev_get_rtnl(sdata->dev);
 335         if (!idev)
 336                 return NOTIFY_DONE;
 337
 338         ifmgd = &sdata->u.mgd;
 339         mutex_lock(&ifmgd->mtx);
 340
 341         /* Copy the addresses to the bss_conf list */
 342         ifa = idev->ifa_list;
 343         while (ifa) {
 344                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 345                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 346                 ifa = ifa->ifa_next;
 347                 c++;
 348         }
 349
 350         bss_conf->arp_addr_cnt = c;
 351
 352         /* Configure driver only if associated (which also implies it is up) */
 353         if (ifmgd->associated)
 354                 ieee80211_bss_info_change_notify(sdata,
 355                                                  BSS_CHANGED_ARP_FILTER);
 356
 357         mutex_unlock(&ifmgd->mtx);
 358
 359         return NOTIFY_DONE;
 360 }
 361 #endif
 362
 363 #if IS_ENABLED(CONFIG_IPV6)
 364 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 365                                   unsigned long data, void *arg)
 366 {
 367         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 368         struct inet6_dev *idev = ifa->idev;
 369         struct net_device *ndev = ifa->idev->dev;
 370         struct ieee80211_local *local =
 371                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 372         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 373         struct ieee80211_sub_if_data *sdata;
 374
 375         /* Make sure it's our interface that got changed */
 376         if (!wdev || wdev->wiphy != local->hw.wiphy)
 377                 return NOTIFY_DONE;
 378
 379         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 380
 381         /*
 382          * For now only support station mode. This is mostly because
 383          * doing AP would have to handle AP_VLAN in some way ...
 384          */
 385         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 386                 return NOTIFY_DONE;
 387
 388         drv_ipv6_addr_change(local, sdata, idev);
 389
 390         return NOTIFY_DONE;
 391 }
 392 #endif
 393
 394 /* There isn't a lot of sense in it, but you can transmit anything you like */
 395 static const struct ieee80211_txrx_stypes
 396 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 397         [NL80211_IFTYPE_ADHOC] = {
 398                 .tx = 0xffff,
 399                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 400                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 401                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 402                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 403         },
 404         [NL80211_IFTYPE_STATION] = {
 405                 .tx = 0xffff,
 406                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 407                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 408         },
 409         [NL80211_IFTYPE_AP] = {
 410                 .tx = 0xffff,
 411                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 412                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 413                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 414                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 415                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 416                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 417                         BIT(IEEE80211_STYPE_ACTION >> 4),
 418         },
 419         [NL80211_IFTYPE_AP_VLAN] = {
 420                 /* copy AP */
 421                 .tx = 0xffff,
 422                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 423                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 424                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 425                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 426                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 427                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 428                         BIT(IEEE80211_STYPE_ACTION >> 4),
 429         },
 430         [NL80211_IFTYPE_P2P_CLIENT] = {
 431                 .tx = 0xffff,
 432                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 433                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 434         },
 435         [NL80211_IFTYPE_P2P_GO] = {
 436                 .tx = 0xffff,
 437                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 438                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 439                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 440                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 441                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 442                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 443                         BIT(IEEE80211_STYPE_ACTION >> 4),
 444         },
 445         [NL80211_IFTYPE_MESH_POINT] = {
 446                 .tx = 0xffff,
 447                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 448                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 449                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 450         },
 451         [NL80211_IFTYPE_P2P_DEVICE] = {
 452                 .tx = 0xffff,
 453                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 454                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 455         },
 456 };
 457
 458 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 459         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 460                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 461
 462         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 463                                 IEEE80211_HT_CAP_MAX_AMSDU |
 464                                 IEEE80211_HT_CAP_SGI_20 |
 465                                 IEEE80211_HT_CAP_SGI_40),
 466         .mcs = {
 467                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 468                              0xff, 0xff, 0xff, 0xff, 0xff, },
 469         },
 470 };
 471
 472 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 473         .vht_cap_info =
 474                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 475                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 476                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 477                             IEEE80211_VHT_CAP_RXSTBC_1 |
 478                             IEEE80211_VHT_CAP_RXSTBC_2 |
 479                             IEEE80211_VHT_CAP_RXSTBC_3 |
 480                             IEEE80211_VHT_CAP_RXSTBC_4 |
 481                             IEEE80211_VHT_CAP_TXSTBC |
 482                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 483                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 484                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 485                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 486                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 487         .supp_mcs = {
 488                 .rx_mcs_map = cpu_to_le16(~0),
 489                 .tx_mcs_map = cpu_to_le16(~0),
 490         },
 491 };
 492
 493 static const u8 extended_capabilities[] = {
 494         0, 0, 0, 0, 0, 0, 0,
 495         WLAN_EXT_CAPA8_OPMODE_NOTIF,
 496 };
 497
 498 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 499                                         const struct ieee80211_ops *ops)
 500 {
 501         struct ieee80211_local *local;
 502         int priv_size, i;
 503         struct wiphy *wiphy;
 504         bool use_chanctx;
 505
 506         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 507                     !ops->add_interface || !ops->remove_interface ||
 508                     !ops->configure_filter))
 509                 return NULL;
 510
 511         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 512                 return NULL;
 513
 514         /* check all or no channel context operations exist */
 515         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 516             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 517             !!ops->unassign_vif_chanctx;
 518         if (WARN_ON(i != 0 && i != 5))
 519                 return NULL;
 520         use_chanctx = i == 5;
 521
 522         /* Ensure 32-byte alignment of our private data and hw private data.
 523          * We use the wiphy priv data for both our ieee80211_local and for
 524          * the driver's private data
 525          *
 526          * In memory it'll be like this:
 527          *
 528          * +-------------------------+
 529          * | struct wiphy           |
 530          * +-------------------------+
 531          * | struct ieee80211_local  |
 532          * +-------------------------+
 533          * | driver's private data   |
 534          * +-------------------------+
 535          *
 536          */
 537         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 538
 539         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 540
 541         if (!wiphy)
 542                 return NULL;
 543
 544         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 545
 546         wiphy->privid = mac80211_wiphy_privid;
 547
 548         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 549                         WIPHY_FLAG_4ADDR_AP |
 550                         WIPHY_FLAG_4ADDR_STATION |
 551                         WIPHY_FLAG_REPORTS_OBSS |
 552                         WIPHY_FLAG_OFFCHAN_TX;
 553
 554         wiphy->extended_capabilities = extended_capabilities;
 555         wiphy->extended_capabilities_mask = extended_capabilities;
 556         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
 557
 558         if (ops->remain_on_channel)
 559                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 560
 561         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 562                            NL80211_FEATURE_SAE |
 563                            NL80211_FEATURE_HT_IBSS |
 564                            NL80211_FEATURE_VIF_TXPOWER |
 565                            NL80211_FEATURE_USERSPACE_MPM;
 566
 567         if (!ops->hw_scan)
 568                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 569                                    NL80211_FEATURE_AP_SCAN;
 570
 571
 572         if (!ops->set_key)
 573                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 574
 575         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 576
 577         local = wiphy_priv(wiphy);
 578
 579         local->hw.wiphy = wiphy;
 580
 581         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 582
 583         local->ops = ops;
 584         local->use_chanctx = use_chanctx;
 585
 586         /* set up some defaults */
 587         local->hw.queues = 1;
 588         local->hw.max_rates = 1;
 589         local->hw.max_report_rates = 0;
 590         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 591         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 592         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 593         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 594         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 595         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 596                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 597                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 598         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 599                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 600         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 601         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 602         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 603         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 604         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 605
 606         INIT_LIST_HEAD(&local->interfaces);
 607
 608         __hw_addr_init(&local->mc_list);
 609
 610         mutex_init(&local->iflist_mtx);
 611         mutex_init(&local->mtx);
 612
 613         mutex_init(&local->key_mtx);
 614         spin_lock_init(&local->filter_lock);
 615         spin_lock_init(&local->rx_path_lock);
 616         spin_lock_init(&local->queue_stop_reason_lock);
 617
 618         INIT_LIST_HEAD(&local->chanctx_list);
 619         mutex_init(&local->chanctx_mtx);
 620
 621         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 622
 623         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 624
 625         INIT_WORK(&local->radar_detected_work,
 626                   ieee80211_dfs_radar_detected_work);
 627
 628         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 629         local->smps_mode = IEEE80211_SMPS_OFF;
 630
 631         INIT_WORK(&local->dynamic_ps_enable_work,
 632                   ieee80211_dynamic_ps_enable_work);
 633         INIT_WORK(&local->dynamic_ps_disable_work,
 634                   ieee80211_dynamic_ps_disable_work);
 635         setup_timer(&local->dynamic_ps_timer,
 636                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 637
 638         INIT_WORK(&local->sched_scan_stopped_work,
 639                   ieee80211_sched_scan_stopped_work);
 640
 641         spin_lock_init(&local->ack_status_lock);
 642         idr_init(&local->ack_status_frames);
 643
 644         sta_info_init(local);
 645
 646         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 647                 skb_queue_head_init(&local->pending[i]);
 648                 atomic_set(&local->agg_queue_stop[i], 0);
 649         }
 650         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 651                      (unsigned long)local);
 652
 653         tasklet_init(&local->tasklet,
 654                      ieee80211_tasklet_handler,
 655                      (unsigned long) local);
 656
 657         skb_queue_head_init(&local->skb_queue);
 658         skb_queue_head_init(&local->skb_queue_unreliable);
 659
 660         ieee80211_led_names(local);
 661
 662         ieee80211_roc_setup(local);
 663
 664         return &local->hw;
 665 }
 666 EXPORT_SYMBOL(ieee80211_alloc_hw);
 667
 668 int ieee80211_register_hw(struct ieee80211_hw *hw)
 669 {
 670         struct ieee80211_local *local = hw_to_local(hw);
 671         int result, i;
 672         enum ieee80211_band band;
 673         int channels, max_bitrates;
 674         bool supp_ht, supp_vht;
 675         netdev_features_t feature_whitelist;
 676         struct cfg80211_chan_def dflt_chandef = {};
 677         static const u32 cipher_suites[] = {
 678                 /* keep WEP first, it may be removed below */
 679                 WLAN_CIPHER_SUITE_WEP40,
 680                 WLAN_CIPHER_SUITE_WEP104,
 681                 WLAN_CIPHER_SUITE_TKIP,
 682                 WLAN_CIPHER_SUITE_CCMP,
 683
 684                 /* keep last -- depends on hw flags! */
 685                 WLAN_CIPHER_SUITE_AES_CMAC
 686         };
 687
 688         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 689             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 690              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 691                 return -EINVAL;
 692
 693 #ifdef CONFIG_PM
 694         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 695             (!local->ops->suspend || !local->ops->resume))
 696                 return -EINVAL;
 697 #endif
 698
 699         if (!local->use_chanctx) {
 700                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 701                         const struct ieee80211_iface_combination *comb;
 702
 703                         comb = &local->hw.wiphy->iface_combinations[i];
 704
 705                         if (comb->num_different_channels > 1)
 706                                 return -EINVAL;
 707                 }
 708         } else {
 709                 /*
 710                  * WDS is currently prohibited when channel contexts are used
 711                  * because there's no clear definition of which channel WDS
 712                  * type interfaces use
 713                  */
 714                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 715                         return -EINVAL;
 716
 717                 /* DFS currently not supported with channel context drivers */
 718                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 719                         const struct ieee80211_iface_combination *comb;
 720
 721                         comb = &local->hw.wiphy->iface_combinations[i];
 722
 723                         if (comb->radar_detect_widths)
 724                                 return -EINVAL;
 725                 }
 726         }
 727
 728         /* Only HW csum features are currently compatible with mac80211 */
 729         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 730                             NETIF_F_HW_CSUM;
 731         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 732                 return -EINVAL;
 733
 734         if (hw->max_report_rates == 0)
 735                 hw->max_report_rates = hw->max_rates;
 736
 737         local->rx_chains = 1;
 738
 739         /*
 740          * generic code guarantees at least one band,
 741          * set this very early because much code assumes
 742          * that hw.conf.channel is assigned
 743          */
 744         channels = 0;
 745         max_bitrates = 0;
 746         supp_ht = false;
 747         supp_vht = false;
 748         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 749                 struct ieee80211_supported_band *sband;
 750
 751                 sband = local->hw.wiphy->bands[band];
 752                 if (!sband)
 753                         continue;
 754
 755                 if (!dflt_chandef.chan) {
 756                         cfg80211_chandef_create(&dflt_chandef,
 757                                                 &sband->channels[0],
 758                                                 NL80211_CHAN_NO_HT);
 759                         /* init channel we're on */
 760                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 761                                 local->hw.conf.chandef = dflt_chandef;
 762                                 local->_oper_chandef = dflt_chandef;
 763                         }
 764                         local->monitor_chandef = dflt_chandef;
 765                 }
 766
 767                 channels += sband->n_channels;
 768
 769                 if (max_bitrates < sband->n_bitrates)
 770                         max_bitrates = sband->n_bitrates;
 771                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 772                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 773
 774                 if (sband->ht_cap.ht_supported)
 775                         local->rx_chains =
 776                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 777                                     local->rx_chains);
 778
 779                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 780         }
 781
 782         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 783                                       sizeof(void *) * channels, GFP_KERNEL);
 784         if (!local->int_scan_req)
 785                 return -ENOMEM;
 786
 787         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 788                 if (!local->hw.wiphy->bands[band])
 789                         continue;
 790                 local->int_scan_req->rates[band] = (u32) -1;
 791         }
 792
 793         /* if low-level driver supports AP, we also support VLAN */
 794         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 795                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 796                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 797         }
 798
 799         /* mac80211 always supports monitor */
 800         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 801         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 802
 803         /* mac80211 doesn't support more than one IBSS interface right now */
 804         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 805                 const struct ieee80211_iface_combination *c;
 806                 int j;
 807
 808                 c = &hw->wiphy->iface_combinations[i];
 809
 810                 for (j = 0; j < c->n_limits; j++)
 811                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 812                             c->limits[j].max > 1)
 813                                 return -EINVAL;
 814         }
 815
 816 #ifndef CONFIG_MAC80211_MESH
 817         /* mesh depends on Kconfig, but drivers should set it if they want */
 818         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 819 #endif
 820
 821         /* if the underlying driver supports mesh, mac80211 will (at least)
 822          * provide routing of mesh authentication frames to userspace */
 823         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 824                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 825
 826         /* mac80211 supports control port protocol changing */
 827         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 828
 829         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 830                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 831         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 832                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 833
 834         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 835              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 836              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 837
 838         /*
 839          * Calculate scan IE length -- we need this to alloc
 840          * memory and to subtract from the driver limit. It
 841          * includes the DS Params, (extended) supported rates, and HT
 842          * information -- SSID is the driver's responsibility.
 843          */
 844         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 845                 3 /* DS Params */;
 846         if (supp_ht)
 847                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 848
 849         if (supp_vht)
 850                 local->scan_ies_len +=
 851                         2 + sizeof(struct ieee80211_vht_cap);
 852
 853         if (!local->ops->hw_scan) {
 854                 /* For hw_scan, driver needs to set these up. */
 855                 local->hw.wiphy->max_scan_ssids = 4;
 856                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 857         }
 858
 859         /*
 860          * If the driver supports any scan IEs, then assume the
 861          * limit includes the IEs mac80211 will add, otherwise
 862          * leave it at zero and let the driver sort it out; we
 863          * still pass our IEs to the driver but userspace will
 864          * not be allowed to in that case.
 865          */
 866         if (local->hw.wiphy->max_scan_ie_len)
 867                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 868
 869         /* Set up cipher suites unless driver already did */
 870         if (!local->hw.wiphy->cipher_suites) {
 871                 local->hw.wiphy->cipher_suites = cipher_suites;
 872                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 873                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 874                         local->hw.wiphy->n_cipher_suites--;
 875         }
 876         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 877                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 878                         local->hw.wiphy->cipher_suites += 2;
 879                         local->hw.wiphy->n_cipher_suites -= 2;
 880                 } else {
 881                         u32 *suites;
 882                         int r, w = 0;
 883
 884                         /* Filter out WEP */
 885
 886                         suites = kmemdup(
 887                                 local->hw.wiphy->cipher_suites,
 888                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 889                                 GFP_KERNEL);
 890                         if (!suites) {
 891                                 result = -ENOMEM;
 892                                 goto fail_wiphy_register;
 893                         }
 894                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 895                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 896                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 897                                     suite == WLAN_CIPHER_SUITE_WEP104)
 898                                         continue;
 899                                 suites[w++] = suite;
 900                         }
 901                         local->hw.wiphy->cipher_suites = suites;
 902                         local->hw.wiphy->n_cipher_suites = w;
 903                         local->wiphy_ciphers_allocated = true;
 904                 }
 905         }
 906
 907         if (!local->ops->remain_on_channel)
 908                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 909
 910         if (local->ops->sched_scan_start)
 911                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 912
 913         /* mac80211 based drivers don't support internal TDLS setup */
 914         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 915                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 916
 917         result = wiphy_register(local->hw.wiphy);
 918         if (result < 0)
 919                 goto fail_wiphy_register;
 920
 921         /*
 922          * We use the number of queues for feature tests (QoS, HT) internally
 923          * so restrict them appropriately.
 924          */
 925         if (hw->queues > IEEE80211_MAX_QUEUES)
 926                 hw->queues = IEEE80211_MAX_QUEUES;
 927
 928         local->workqueue =
 929                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 930         if (!local->workqueue) {
 931                 result = -ENOMEM;
 932                 goto fail_workqueue;
 933         }
 934
 935         /*
 936          * The hardware needs headroom for sending the frame,
 937          * and we need some headroom for passing the frame to monitor
 938          * interfaces, but never both at the same time.
 939          */
 940         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 941                                    IEEE80211_TX_STATUS_HEADROOM);
 942
 943         debugfs_hw_add(local);
 944
 945         /*
 946          * if the driver doesn't specify a max listen interval we
 947          * use 5 which should be a safe default
 948          */
 949         if (local->hw.max_listen_interval == 0)
 950                 local->hw.max_listen_interval = 5;
 951
 952         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 953
 954         local->dynamic_ps_forced_timeout = -1;
 955
 956         result = ieee80211_wep_init(local);
 957         if (result < 0)
 958                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 959                             result);
 960
 961         ieee80211_led_init(local);
 962
 963         rtnl_lock();
 964
 965         result = ieee80211_init_rate_ctrl_alg(local,
 966                                               hw->rate_control_algorithm);
 967         if (result < 0) {
 968                 wiphy_debug(local->hw.wiphy,
 969                             "Failed to initialize rate control algorithm\n");
 970                 goto fail_rate;
 971         }
 972
 973         /* add one default STA interface if supported */
 974         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 975                 result = ieee80211_if_add(local, "wlan%d", NULL,
 976                                           NL80211_IFTYPE_STATION, NULL);
 977                 if (result)
 978                         wiphy_warn(local->hw.wiphy,
 979                                    "Failed to add default virtual iface\n");
 980         }
 981           // ESP8089 register p2p0 IFTYPE_STA
 982         #ifdef CONFIG_ESP8089
 983             if (local->hw.wiphy->interface_modes &(BIT(NL80211_IFTYPE_P2P_GO) |
 984         BIT(NL80211_IFTYPE_P2P_CLIENT))) {
 985                          result = ieee80211_if_add(local, "p2p%d", NULL,
 986                                             NL80211_IFTYPE_STATION, NULL);
 987                               if (result)
 988                                    wiphy_warn(local->hw.wiphy,
 989                                            "Failed to add default virtual iface\n");
 990                         }
 991
 992         #endif
 993         rtnl_unlock();
 994
 995         local->network_latency_notifier.notifier_call =
 996                 ieee80211_max_network_latency;
 997         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 998                                      &local->network_latency_notifier);
 999         if (result) {
1000                 rtnl_lock();
1001                 goto fail_pm_qos;
1002         }
1003
1004 #ifdef CONFIG_INET
1005         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1006         result = register_inetaddr_notifier(&local->ifa_notifier);
1007         if (result)
1008                 goto fail_ifa;
1009 #endif
1010
1011 #if IS_ENABLED(CONFIG_IPV6)
1012         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1013         result = register_inet6addr_notifier(&local->ifa6_notifier);
1014         if (result)
1015                 goto fail_ifa6;
1016 #endif
1017
1018         return 0;
1019
1020 #if IS_ENABLED(CONFIG_IPV6)
1021  fail_ifa6:
1022 #ifdef CONFIG_INET
1023         unregister_inetaddr_notifier(&local->ifa_notifier);
1024 #endif
1025 #endif
1026 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1027  fail_ifa:
1028         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1029                                &local->network_latency_notifier);
1030         rtnl_lock();
1031 #endif
1032  fail_pm_qos:
1033         ieee80211_led_exit(local);
1034         ieee80211_remove_interfaces(local);
1035  fail_rate:
1036         rtnl_unlock();
1037         ieee80211_wep_free(local);
1038         sta_info_stop(local);
1039         destroy_workqueue(local->workqueue);
1040  fail_workqueue:
1041         wiphy_unregister(local->hw.wiphy);
1042  fail_wiphy_register:
1043         if (local->wiphy_ciphers_allocated)
1044                 kfree(local->hw.wiphy->cipher_suites);
1045         kfree(local->int_scan_req);
1046         return result;
1047 }
1048 EXPORT_SYMBOL(ieee80211_register_hw);
1049
1050 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1051 {
1052         struct ieee80211_local *local = hw_to_local(hw);
1053
1054         tasklet_kill(&local->tx_pending_tasklet);
1055         tasklet_kill(&local->tasklet);
1056
1057         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1058                                &local->network_latency_notifier);
1059 #ifdef CONFIG_INET
1060         unregister_inetaddr_notifier(&local->ifa_notifier);
1061 #endif
1062 #if IS_ENABLED(CONFIG_IPV6)
1063         unregister_inet6addr_notifier(&local->ifa6_notifier);
1064 #endif
1065
1066         rtnl_lock();
1067
1068         /*
1069          * At this point, interface list manipulations are fine
1070          * because the driver cannot be handing us frames any
1071          * more and the tasklet is killed.
1072          */
1073         ieee80211_remove_interfaces(local);
1074
1075         rtnl_unlock();
1076
1077         cancel_work_sync(&local->restart_work);
1078         cancel_work_sync(&local->reconfig_filter);
1079
1080         ieee80211_clear_tx_pending(local);
1081         rate_control_deinitialize(local);
1082
1083         if (skb_queue_len(&local->skb_queue) ||
1084             skb_queue_len(&local->skb_queue_unreliable))
1085                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1086         skb_queue_purge(&local->skb_queue);
1087         skb_queue_purge(&local->skb_queue_unreliable);
1088
1089         destroy_workqueue(local->workqueue);
1090         wiphy_unregister(local->hw.wiphy);
1091         sta_info_stop(local);
1092         ieee80211_wep_free(local);
1093         ieee80211_led_exit(local);
1094         kfree(local->int_scan_req);
1095 }
1096 EXPORT_SYMBOL(ieee80211_unregister_hw);
1097
1098 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1099 {
1100         WARN_ONCE(1, "Have pending ack frames!\n");
1101         kfree_skb(p);
1102         return 0;
1103 }
1104
1105 void ieee80211_free_hw(struct ieee80211_hw *hw)
1106 {
1107         struct ieee80211_local *local = hw_to_local(hw);
1108
1109         mutex_destroy(&local->iflist_mtx);
1110         mutex_destroy(&local->mtx);
1111
1112         if (local->wiphy_ciphers_allocated)
1113                 kfree(local->hw.wiphy->cipher_suites);
1114
1115         idr_for_each(&local->ack_status_frames,
1116                      ieee80211_free_ack_frame, NULL);
1117         idr_destroy(&local->ack_status_frames);
1118
1119         wiphy_free(local->hw.wiphy);
1120 }
1121 EXPORT_SYMBOL(ieee80211_free_hw);
1122
1123 static int __init ieee80211_init(void)
1124 {
1125         struct sk_buff *skb;
1126         int ret;
1127
1128         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1129         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1130                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1131
1132         ret = rc80211_minstrel_init();
1133         if (ret)
1134                 return ret;
1135
1136         ret = rc80211_minstrel_ht_init();
1137         if (ret)
1138                 goto err_minstrel;
1139
1140         ret = rc80211_pid_init();
1141         if (ret)
1142                 goto err_pid;
1143
1144         ret = ieee80211_iface_init();
1145         if (ret)
1146                 goto err_netdev;
1147
1148         return 0;
1149  err_netdev:
1150         rc80211_pid_exit();
1151  err_pid:
1152         rc80211_minstrel_ht_exit();
1153  err_minstrel:
1154         rc80211_minstrel_exit();
1155
1156         return ret;
1157 }
1158
1159 static void __exit ieee80211_exit(void)
1160 {
1161         rc80211_pid_exit();
1162         rc80211_minstrel_ht_exit();
1163         rc80211_minstrel_exit();
1164
1165         ieee80211s_stop();
1166
1167         ieee80211_iface_exit();
1168
1169         rcu_barrier();
1170 }
1171
1172
1173 subsys_initcall(ieee80211_init);
1174 module_exit(ieee80211_exit);
1175
1176 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1177 MODULE_LICENSE("GPL");