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 <[email protected]>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <net/mac80211.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/bitmap.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 "debugfs.h"
  35
  36 void ieee80211_configure_filter(struct ieee80211_local *local)
  37 {
  38         u64 mc;
  39         unsigned int changed_flags;
  40         unsigned int new_flags = 0;
  41
  42         if (atomic_read(&local->iff_allmultis))
  43                 new_flags |= FIF_ALLMULTI;
  44
  45         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  46             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  47                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  48
  49         if (local->fif_probe_req || local->probe_req_reg)
  50                 new_flags |= FIF_PROBE_REQ;
  51
  52         if (local->fif_fcsfail)
  53                 new_flags |= FIF_FCSFAIL;
  54
  55         if (local->fif_plcpfail)
  56                 new_flags |= FIF_PLCPFAIL;
  57
  58         if (local->fif_control)
  59                 new_flags |= FIF_CONTROL;
  60
  61         if (local->fif_other_bss)
  62                 new_flags |= FIF_OTHER_BSS;
  63
  64         if (local->fif_pspoll)
  65                 new_flags |= FIF_PSPOLL;
  66
  67         spin_lock_bh(&local->filter_lock);
  68         changed_flags = local->filter_flags ^ new_flags;
  69
  70         mc = drv_prepare_multicast(local, &local->mc_list);
  71         spin_unlock_bh(&local->filter_lock);
  72
  73         /* be a bit nasty */
  74         new_flags |= (1<<31);
  75
  76         drv_configure_filter(local, changed_flags, &new_flags, mc);
  77
  78         WARN_ON(new_flags & (1<<31));
  79
  80         local->filter_flags = new_flags & ~(1<<31);
  81 }
  82
  83 static void ieee80211_reconfig_filter(struct work_struct *work)
  84 {
  85         struct ieee80211_local *local =
  86                 container_of(work, struct ieee80211_local, reconfig_filter);
  87
  88         ieee80211_configure_filter(local);
  89 }
  90
  91 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  92 {
  93         struct ieee80211_sub_if_data *sdata;
  94         struct cfg80211_chan_def chandef = {};
  95         u32 changed = 0;
  96         int power;
  97         u32 offchannel_flag;
  98
  99         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 100
 101         if (local->scan_chandef.chan) {
 102                 chandef = local->scan_chandef;
 103         } else if (local->tmp_channel) {
 104                 chandef.chan = local->tmp_channel;
 105                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 106                 chandef.center_freq1 = chandef.chan->center_freq;
 107         } else
 108                 chandef = local->_oper_chandef;
 109
 110         WARN(!cfg80211_chandef_valid(&chandef),
 111              "control:%d MHz width:%d center: %d/%d MHz",
 112              chandef.chan->center_freq, chandef.width,
 113              chandef.center_freq1, chandef.center_freq2);
 114
 115         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
 116                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 117         else
 118                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 119
 120         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 121
 122         if (offchannel_flag ||
 123             !cfg80211_chandef_identical(&local->hw.conf.chandef,
 124                                         &local->_oper_chandef)) {
 125                 local->hw.conf.chandef = chandef;
 126                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 127         }
 128
 129         if (!conf_is_ht(&local->hw.conf)) {
 130                 /*
 131                  * mac80211.h documents that this is only valid
 132                  * when the channel is set to an HT type, and
 133                  * that otherwise STATIC is used.
 134                  */
 135                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 136         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 137                 local->hw.conf.smps_mode = local->smps_mode;
 138                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 139         }
 140
 141         power = ieee80211_chandef_max_power(&chandef);
 142
 143         rcu_read_lock();
 144         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 145                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 146                         continue;
 147                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 148                         continue;
 149                 power = min(power, sdata->vif.bss_conf.txpower);
 150         }
 151         rcu_read_unlock();
 152
 153         if (local->hw.conf.power_level != power) {
 154                 changed |= IEEE80211_CONF_CHANGE_POWER;
 155                 local->hw.conf.power_level = power;
 156         }
 157
 158         return changed;
 159 }
 160
 161 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 162 {
 163         int ret = 0;
 164
 165         might_sleep();
 166
 167         if (!local->use_chanctx)
 168                 changed |= ieee80211_hw_conf_chan(local);
 169         else
 170                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 171                              IEEE80211_CONF_CHANGE_POWER);
 172
 173         if (changed && local->open_count) {
 174                 ret = drv_config(local, changed);
 175                 /*
 176                  * Goal:
 177                  * HW reconfiguration should never fail, the driver has told
 178                  * us what it can support so it should live up to that promise.
 179                  *
 180                  * Current status:
 181                  * rfkill is not integrated with mac80211 and a
 182                  * configuration command can thus fail if hardware rfkill
 183                  * is enabled
 184                  *
 185                  * FIXME: integrate rfkill with mac80211 and then add this
 186                  * WARN_ON() back
 187                  *
 188                  */
 189                 /* WARN_ON(ret); */
 190         }
 191
 192         return ret;
 193 }
 194
 195 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 196                                       u32 changed)
 197 {
 198         struct ieee80211_local *local = sdata->local;
 199
 200         if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 201                 return;
 202
 203         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 204 }
 205
 206 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 207 {
 208         sdata->vif.bss_conf.use_cts_prot = false;
 209         sdata->vif.bss_conf.use_short_preamble = false;
 210         sdata->vif.bss_conf.use_short_slot = false;
 211         return BSS_CHANGED_ERP_CTS_PROT |
 212                BSS_CHANGED_ERP_PREAMBLE |
 213                BSS_CHANGED_ERP_SLOT;
 214 }
 215
 216 static void ieee80211_tasklet_handler(unsigned long data)
 217 {
 218         struct ieee80211_local *local = (struct ieee80211_local *) data;
 219         struct sk_buff *skb;
 220
 221         while ((skb = skb_dequeue(&local->skb_queue)) ||
 222                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 223                 switch (skb->pkt_type) {
 224                 case IEEE80211_RX_MSG:
 225                         /* Clear skb->pkt_type in order to not confuse kernel
 226                          * netstack. */
 227                         skb->pkt_type = 0;
 228                         ieee80211_rx(&local->hw, skb);
 229                         break;
 230                 case IEEE80211_TX_STATUS_MSG:
 231                         skb->pkt_type = 0;
 232                         ieee80211_tx_status(&local->hw, skb);
 233                         break;
 234                 default:
 235                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 236                              skb->pkt_type);
 237                         dev_kfree_skb(skb);
 238                         break;
 239                 }
 240         }
 241 }
 242
 243 static void ieee80211_restart_work(struct work_struct *work)
 244 {
 245         struct ieee80211_local *local =
 246                 container_of(work, struct ieee80211_local, restart_work);
 247         struct ieee80211_sub_if_data *sdata;
 248
 249         /* wait for scan work complete */
 250         flush_workqueue(local->workqueue);
 251         flush_work(&local->sched_scan_stopped_work);
 252
 253         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 254              "%s called with hardware scan in progress\n", __func__);
 255
 256         flush_work(&local->radar_detected_work);
 257         rtnl_lock();
 258         list_for_each_entry(sdata, &local->interfaces, list)
 259                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 260         ieee80211_scan_cancel(local);
 261
 262         /* make sure any new ROC will consider local->in_reconfig */
 263         flush_delayed_work(&local->roc_work);
 264         flush_work(&local->hw_roc_done);
 265
 266         ieee80211_reconfig(local);
 267         rtnl_unlock();
 268 }
 269
 270 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 271 {
 272         struct ieee80211_local *local = hw_to_local(hw);
 273
 274         trace_api_restart_hw(local);
 275
 276         wiphy_info(hw->wiphy,
 277                    "Hardware restart was requested\n");
 278
 279         /* use this reason, ieee80211_reconfig will unblock it */
 280         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 281                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 282                                         false);
 283
 284         /*
 285          * Stop all Rx during the reconfig. We don't want state changes
 286          * or driver callbacks while this is in progress.
 287          */
 288         local->in_reconfig = true;
 289         barrier();
 290
 291         queue_work(system_freezable_wq, &local->restart_work);
 292 }
 293 EXPORT_SYMBOL(ieee80211_restart_hw);
 294
 295 #ifdef CONFIG_INET
 296 static int ieee80211_ifa_changed(struct notifier_block *nb,
 297                                  unsigned long data, void *arg)
 298 {
 299         struct in_ifaddr *ifa = arg;
 300         struct ieee80211_local *local =
 301                 container_of(nb, struct ieee80211_local,
 302                              ifa_notifier);
 303         struct net_device *ndev = ifa->ifa_dev->dev;
 304         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 305         struct in_device *idev;
 306         struct ieee80211_sub_if_data *sdata;
 307         struct ieee80211_bss_conf *bss_conf;
 308         struct ieee80211_if_managed *ifmgd;
 309         int c = 0;
 310
 311         /* Make sure it's our interface that got changed */
 312         if (!wdev)
 313                 return NOTIFY_DONE;
 314
 315         if (wdev->wiphy != local->hw.wiphy)
 316                 return NOTIFY_DONE;
 317
 318         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 319         bss_conf = &sdata->vif.bss_conf;
 320
 321         /* ARP filtering is only supported in managed mode */
 322         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 323                 return NOTIFY_DONE;
 324
 325         idev = __in_dev_get_rtnl(sdata->dev);
 326         if (!idev)
 327                 return NOTIFY_DONE;
 328
 329         ifmgd = &sdata->u.mgd;
 330         sdata_lock(sdata);
 331
 332         /* Copy the addresses to the bss_conf list */
 333         ifa = idev->ifa_list;
 334         while (ifa) {
 335                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 336                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 337                 ifa = ifa->ifa_next;
 338                 c++;
 339         }
 340
 341         bss_conf->arp_addr_cnt = c;
 342
 343         /* Configure driver only if associated (which also implies it is up) */
 344         if (ifmgd->associated)
 345                 ieee80211_bss_info_change_notify(sdata,
 346                                                  BSS_CHANGED_ARP_FILTER);
 347
 348         sdata_unlock(sdata);
 349
 350         return NOTIFY_OK;
 351 }
 352 #endif
 353
 354 #if IS_ENABLED(CONFIG_IPV6)
 355 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 356                                   unsigned long data, void *arg)
 357 {
 358         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 359         struct inet6_dev *idev = ifa->idev;
 360         struct net_device *ndev = ifa->idev->dev;
 361         struct ieee80211_local *local =
 362                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 363         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 364         struct ieee80211_sub_if_data *sdata;
 365
 366         /* Make sure it's our interface that got changed */
 367         if (!wdev || wdev->wiphy != local->hw.wiphy)
 368                 return NOTIFY_DONE;
 369
 370         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 371
 372         /*
 373          * For now only support station mode. This is mostly because
 374          * doing AP would have to handle AP_VLAN in some way ...
 375          */
 376         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 377                 return NOTIFY_DONE;
 378
 379         drv_ipv6_addr_change(local, sdata, idev);
 380
 381         return NOTIFY_OK;
 382 }
 383 #endif
 384
 385 /* There isn't a lot of sense in it, but you can transmit anything you like */
 386 static const struct ieee80211_txrx_stypes
 387 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 388         [NL80211_IFTYPE_ADHOC] = {
 389                 .tx = 0xffff,
 390                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 391                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 392                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 393                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 394         },
 395         [NL80211_IFTYPE_STATION] = {
 396                 .tx = 0xffff,
 397                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 398                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 399         },
 400         [NL80211_IFTYPE_AP] = {
 401                 .tx = 0xffff,
 402                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 403                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 404                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 405                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 406                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 407                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 408                         BIT(IEEE80211_STYPE_ACTION >> 4),
 409         },
 410         [NL80211_IFTYPE_AP_VLAN] = {
 411                 /* copy AP */
 412                 .tx = 0xffff,
 413                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 414                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 415                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 416                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 417                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 418                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 419                         BIT(IEEE80211_STYPE_ACTION >> 4),
 420         },
 421         [NL80211_IFTYPE_P2P_CLIENT] = {
 422                 .tx = 0xffff,
 423                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 424                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 425         },
 426         [NL80211_IFTYPE_P2P_GO] = {
 427                 .tx = 0xffff,
 428                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 429                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 430                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 431                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 432                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 433                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 434                         BIT(IEEE80211_STYPE_ACTION >> 4),
 435         },
 436         [NL80211_IFTYPE_MESH_POINT] = {
 437                 .tx = 0xffff,
 438                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 439                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 440                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 441         },
 442         [NL80211_IFTYPE_P2P_DEVICE] = {
 443                 .tx = 0xffff,
 444                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 445                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 446         },
 447 };
 448
 449 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 450         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 451                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 452
 453         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 454                                 IEEE80211_HT_CAP_MAX_AMSDU |
 455                                 IEEE80211_HT_CAP_SGI_20 |
 456                                 IEEE80211_HT_CAP_SGI_40 |
 457                                 IEEE80211_HT_CAP_LDPC_CODING |
 458                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
 459         .mcs = {
 460                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 461                              0xff, 0xff, 0xff, 0xff, 0xff, },
 462         },
 463 };
 464
 465 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 466         .vht_cap_info =
 467                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 468                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 469                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 470                             IEEE80211_VHT_CAP_RXSTBC_1 |
 471                             IEEE80211_VHT_CAP_RXSTBC_2 |
 472                             IEEE80211_VHT_CAP_RXSTBC_3 |
 473                             IEEE80211_VHT_CAP_RXSTBC_4 |
 474                             IEEE80211_VHT_CAP_TXSTBC |
 475                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 476                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 477                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 478                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 479                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 480         .supp_mcs = {
 481                 .rx_mcs_map = cpu_to_le16(~0),
 482                 .tx_mcs_map = cpu_to_le16(~0),
 483         },
 484 };
 485
 486 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 487                                            const struct ieee80211_ops *ops,
 488                                            const char *requested_name)
 489 {
 490         struct ieee80211_local *local;
 491         int priv_size, i;
 492         struct wiphy *wiphy;
 493         bool use_chanctx;
 494
 495         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 496                     !ops->add_interface || !ops->remove_interface ||
 497                     !ops->configure_filter))
 498                 return NULL;
 499
 500         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 501                 return NULL;
 502
 503         /* check all or no channel context operations exist */
 504         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 505             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 506             !!ops->unassign_vif_chanctx;
 507         if (WARN_ON(i != 0 && i != 5))
 508                 return NULL;
 509         use_chanctx = i == 5;
 510
 511         /* Ensure 32-byte alignment of our private data and hw private data.
 512          * We use the wiphy priv data for both our ieee80211_local and for
 513          * the driver's private data
 514          *
 515          * In memory it'll be like this:
 516          *
 517          * +-------------------------+
 518          * | struct wiphy           |
 519          * +-------------------------+
 520          * | struct ieee80211_local  |
 521          * +-------------------------+
 522          * | driver's private data   |
 523          * +-------------------------+
 524          *
 525          */
 526         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 527
 528         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
 529
 530         if (!wiphy)
 531                 return NULL;
 532
 533         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 534
 535         wiphy->privid = mac80211_wiphy_privid;
 536
 537         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 538                         WIPHY_FLAG_4ADDR_AP |
 539                         WIPHY_FLAG_4ADDR_STATION |
 540                         WIPHY_FLAG_REPORTS_OBSS |
 541                         WIPHY_FLAG_OFFCHAN_TX;
 542
 543         if (ops->remain_on_channel)
 544                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 545
 546         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 547                            NL80211_FEATURE_SAE |
 548                            NL80211_FEATURE_HT_IBSS |
 549                            NL80211_FEATURE_VIF_TXPOWER |
 550                            NL80211_FEATURE_MAC_ON_CREATE |
 551                            NL80211_FEATURE_USERSPACE_MPM |
 552                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 553         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
 554
 555         if (!ops->hw_scan)
 556                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 557                                    NL80211_FEATURE_AP_SCAN;
 558
 559
 560         if (!ops->set_key)
 561                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 562
 563         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
 564
 565         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 566
 567         local = wiphy_priv(wiphy);
 568
 569         if (sta_info_init(local))
 570                 goto err_free;
 571
 572         local->hw.wiphy = wiphy;
 573
 574         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 575
 576         local->ops = ops;
 577         local->use_chanctx = use_chanctx;
 578
 579         /* set up some defaults */
 580         local->hw.queues = 1;
 581         local->hw.max_rates = 1;
 582         local->hw.max_report_rates = 0;
 583         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 584         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 585         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 586         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 587         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 588         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 589                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 590                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 591         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 592                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 593         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 594         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 595         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 596         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 597         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 598
 599         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
 600
 601         wiphy->extended_capabilities = local->ext_capa;
 602         wiphy->extended_capabilities_mask = local->ext_capa;
 603         wiphy->extended_capabilities_len =
 604                 ARRAY_SIZE(local->ext_capa);
 605
 606         INIT_LIST_HEAD(&local->interfaces);
 607         INIT_LIST_HEAD(&local->mon_list);
 608
 609         __hw_addr_init(&local->mc_list);
 610
 611         mutex_init(&local->iflist_mtx);
 612         mutex_init(&local->mtx);
 613
 614         mutex_init(&local->key_mtx);
 615         spin_lock_init(&local->filter_lock);
 616         spin_lock_init(&local->rx_path_lock);
 617         spin_lock_init(&local->queue_stop_reason_lock);
 618
 619         INIT_LIST_HEAD(&local->chanctx_list);
 620         mutex_init(&local->chanctx_mtx);
 621
 622         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 623
 624         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 625
 626         INIT_WORK(&local->radar_detected_work,
 627                   ieee80211_dfs_radar_detected_work);
 628
 629         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 630         local->smps_mode = IEEE80211_SMPS_OFF;
 631
 632         INIT_WORK(&local->dynamic_ps_enable_work,
 633                   ieee80211_dynamic_ps_enable_work);
 634         INIT_WORK(&local->dynamic_ps_disable_work,
 635                   ieee80211_dynamic_ps_disable_work);
 636         timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0);
 637
 638         INIT_WORK(&local->sched_scan_stopped_work,
 639                   ieee80211_sched_scan_stopped_work);
 640
 641         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
 642
 643         spin_lock_init(&local->ack_status_lock);
 644         idr_init(&local->ack_status_frames);
 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         skb_queue_head_init(&local->skb_queue_tdls_chsw);
 660
 661         ieee80211_alloc_led_names(local);
 662
 663         ieee80211_roc_setup(local);
 664
 665         local->hw.radiotap_timestamp.units_pos = -1;
 666         local->hw.radiotap_timestamp.accuracy = -1;
 667
 668         return &local->hw;
 669  err_free:
 670         wiphy_free(wiphy);
 671         return NULL;
 672 }
 673 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
 674
 675 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 676 {
 677         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
 678                           IS_ERR(local->wep_rx_tfm));
 679         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
 680         int n_suites = 0, r = 0, w = 0;
 681         u32 *suites;
 682         static const u32 cipher_suites[] = {
 683                 /* keep WEP first, it may be removed below */
 684                 WLAN_CIPHER_SUITE_WEP40,
 685                 WLAN_CIPHER_SUITE_WEP104,
 686                 WLAN_CIPHER_SUITE_TKIP,
 687                 WLAN_CIPHER_SUITE_CCMP,
 688                 WLAN_CIPHER_SUITE_CCMP_256,
 689                 WLAN_CIPHER_SUITE_GCMP,
 690                 WLAN_CIPHER_SUITE_GCMP_256,
 691
 692                 /* keep last -- depends on hw flags! */
 693                 WLAN_CIPHER_SUITE_AES_CMAC,
 694                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
 695                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
 696                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
 697         };
 698
 699         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
 700             local->hw.wiphy->cipher_suites) {
 701                 /* If the driver advertises, or doesn't support SW crypto,
 702                  * we only need to remove WEP if necessary.
 703                  */
 704                 if (have_wep)
 705                         return 0;
 706
 707                 /* well if it has _no_ ciphers ... fine */
 708                 if (!local->hw.wiphy->n_cipher_suites)
 709                         return 0;
 710
 711                 /* Driver provides cipher suites, but we need to exclude WEP */
 712                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 713                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 714                                  GFP_KERNEL);
 715                 if (!suites)
 716                         return -ENOMEM;
 717
 718                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 719                         u32 suite = local->hw.wiphy->cipher_suites[r];
 720
 721                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 722                             suite == WLAN_CIPHER_SUITE_WEP104)
 723                                 continue;
 724                         suites[w++] = suite;
 725                 }
 726         } else if (!local->hw.cipher_schemes) {
 727                 /* If the driver doesn't have cipher schemes, there's nothing
 728                  * else to do other than assign the (software supported and
 729                  * perhaps offloaded) cipher suites.
 730                  */
 731                 local->hw.wiphy->cipher_suites = cipher_suites;
 732                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 733
 734                 if (!have_mfp)
 735                         local->hw.wiphy->n_cipher_suites -= 4;
 736
 737                 if (!have_wep) {
 738                         local->hw.wiphy->cipher_suites += 2;
 739                         local->hw.wiphy->n_cipher_suites -= 2;
 740                 }
 741
 742                 /* not dynamically allocated, so just return */
 743                 return 0;
 744         } else {
 745                 const struct ieee80211_cipher_scheme *cs;
 746
 747                 cs = local->hw.cipher_schemes;
 748
 749                 /* Driver specifies cipher schemes only (but not cipher suites
 750                  * including the schemes)
 751                  *
 752                  * We start counting ciphers defined by schemes, TKIP, CCMP,
 753                  * CCMP-256, GCMP, and GCMP-256
 754                  */
 755                 n_suites = local->hw.n_cipher_schemes + 5;
 756
 757                 /* check if we have WEP40 and WEP104 */
 758                 if (have_wep)
 759                         n_suites += 2;
 760
 761                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
 762                  * BIP-GMAC-256
 763                  */
 764                 if (have_mfp)
 765                         n_suites += 4;
 766
 767                 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
 768                 if (!suites)
 769                         return -ENOMEM;
 770
 771                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 772                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
 773                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 774                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
 775                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
 776
 777                 if (have_wep) {
 778                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 779                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 780                 }
 781
 782                 if (have_mfp) {
 783                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 784                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
 785                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
 786                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
 787                 }
 788
 789                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
 790                         suites[w++] = cs[r].cipher;
 791                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
 792                                 kfree(suites);
 793                                 return -EINVAL;
 794                         }
 795                 }
 796         }
 797
 798         local->hw.wiphy->cipher_suites = suites;
 799         local->hw.wiphy->n_cipher_suites = w;
 800         local->wiphy_ciphers_allocated = true;
 801
 802         return 0;
 803 }
 804
 805 int ieee80211_register_hw(struct ieee80211_hw *hw)
 806 {
 807         struct ieee80211_local *local = hw_to_local(hw);
 808         int result, i;
 809         enum nl80211_band band;
 810         int channels, max_bitrates;
 811         bool supp_ht, supp_vht;
 812         netdev_features_t feature_whitelist;
 813         struct cfg80211_chan_def dflt_chandef = {};
 814
 815         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
 816             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 817              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 818                 return -EINVAL;
 819
 820         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 821             (!local->ops->tdls_channel_switch ||
 822              !local->ops->tdls_cancel_channel_switch ||
 823              !local->ops->tdls_recv_channel_switch))
 824                 return -EOPNOTSUPP;
 825
 826         if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
 827                     !local->ops->set_frag_threshold))
 828                 return -EINVAL;
 829
 830         if (WARN_ON(local->hw.wiphy->interface_modes &
 831                         BIT(NL80211_IFTYPE_NAN) &&
 832                     (!local->ops->start_nan || !local->ops->stop_nan)))
 833                 return -EINVAL;
 834
 835 #ifdef CONFIG_PM
 836         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 837                 return -EINVAL;
 838 #endif
 839
 840         if (!local->use_chanctx) {
 841                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 842                         const struct ieee80211_iface_combination *comb;
 843
 844                         comb = &local->hw.wiphy->iface_combinations[i];
 845
 846                         if (comb->num_different_channels > 1)
 847                                 return -EINVAL;
 848                 }
 849         } else {
 850                 /*
 851                  * WDS is currently prohibited when channel contexts are used
 852                  * because there's no clear definition of which channel WDS
 853                  * type interfaces use
 854                  */
 855                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 856                         return -EINVAL;
 857
 858                 /* DFS is not supported with multi-channel combinations yet */
 859                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 860                         const struct ieee80211_iface_combination *comb;
 861
 862                         comb = &local->hw.wiphy->iface_combinations[i];
 863
 864                         if (comb->radar_detect_widths &&
 865                             comb->num_different_channels > 1)
 866                                 return -EINVAL;
 867                 }
 868         }
 869
 870         /* Only HW csum features are currently compatible with mac80211 */
 871         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 872                             NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
 873                             NETIF_F_GSO_SOFTWARE | NETIF_F_RXCSUM;
 874         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 875                 return -EINVAL;
 876
 877         if (hw->max_report_rates == 0)
 878                 hw->max_report_rates = hw->max_rates;
 879
 880         local->rx_chains = 1;
 881
 882         /*
 883          * generic code guarantees at least one band,
 884          * set this very early because much code assumes
 885          * that hw.conf.channel is assigned
 886          */
 887         channels = 0;
 888         max_bitrates = 0;
 889         supp_ht = false;
 890         supp_vht = false;
 891         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 892                 struct ieee80211_supported_band *sband;
 893
 894                 sband = local->hw.wiphy->bands[band];
 895                 if (!sband)
 896                         continue;
 897
 898                 if (!dflt_chandef.chan) {
 899                         cfg80211_chandef_create(&dflt_chandef,
 900                                                 &sband->channels[0],
 901                                                 NL80211_CHAN_NO_HT);
 902                         /* init channel we're on */
 903                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 904                                 local->hw.conf.chandef = dflt_chandef;
 905                                 local->_oper_chandef = dflt_chandef;
 906                         }
 907                         local->monitor_chandef = dflt_chandef;
 908                 }
 909
 910                 channels += sband->n_channels;
 911
 912                 if (max_bitrates < sband->n_bitrates)
 913                         max_bitrates = sband->n_bitrates;
 914                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 915                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 916
 917                 if (!sband->ht_cap.ht_supported)
 918                         continue;
 919
 920                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 921                 local->rx_chains =
 922                         max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 923                             local->rx_chains);
 924
 925                 /* no need to mask, SM_PS_DISABLED has all bits set */
 926                 sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 927                                      IEEE80211_HT_CAP_SM_PS_SHIFT;
 928         }
 929
 930         /* if low-level driver supports AP, we also support VLAN */
 931         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 932                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 933                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 934         }
 935
 936         /* mac80211 always supports monitor */
 937         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 938         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 939
 940         /* mac80211 doesn't support more than one IBSS interface right now */
 941         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 942                 const struct ieee80211_iface_combination *c;
 943                 int j;
 944
 945                 c = &hw->wiphy->iface_combinations[i];
 946
 947                 for (j = 0; j < c->n_limits; j++)
 948                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 949                             c->limits[j].max > 1)
 950                                 return -EINVAL;
 951         }
 952
 953         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 954                                       sizeof(void *) * channels, GFP_KERNEL);
 955         if (!local->int_scan_req)
 956                 return -ENOMEM;
 957
 958         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 959                 if (!local->hw.wiphy->bands[band])
 960                         continue;
 961                 local->int_scan_req->rates[band] = (u32) -1;
 962         }
 963
 964 #ifndef CONFIG_MAC80211_MESH
 965         /* mesh depends on Kconfig, but drivers should set it if they want */
 966         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 967 #endif
 968
 969         /* if the underlying driver supports mesh, mac80211 will (at least)
 970          * provide routing of mesh authentication frames to userspace */
 971         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 972                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 973
 974         /* mac80211 supports control port protocol changing */
 975         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 976
 977         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
 978                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 979         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
 980                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 981                 if (hw->max_signal <= 0) {
 982                         result = -EINVAL;
 983                         goto fail_wiphy_register;
 984                 }
 985         }
 986
 987         /*
 988          * Calculate scan IE length -- we need this to alloc
 989          * memory and to subtract from the driver limit. It
 990          * includes the DS Params, (extended) supported rates, and HT
 991          * information -- SSID is the driver's responsibility.
 992          */
 993         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 994                 3 /* DS Params */;
 995         if (supp_ht)
 996                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 997
 998         if (supp_vht)
 999                 local->scan_ies_len +=
1000                         2 + sizeof(struct ieee80211_vht_cap);
1001
1002         if (!local->ops->hw_scan) {
1003                 /* For hw_scan, driver needs to set these up. */
1004                 local->hw.wiphy->max_scan_ssids = 4;
1005                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
1006         }
1007
1008         /*
1009          * If the driver supports any scan IEs, then assume the
1010          * limit includes the IEs mac80211 will add, otherwise
1011          * leave it at zero and let the driver sort it out; we
1012          * still pass our IEs to the driver but userspace will
1013          * not be allowed to in that case.
1014          */
1015         if (local->hw.wiphy->max_scan_ie_len)
1016                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1017
1018         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1019                                          local->hw.n_cipher_schemes));
1020
1021         result = ieee80211_init_cipher_suites(local);
1022         if (result < 0)
1023                 goto fail_wiphy_register;
1024
1025         if (!local->ops->remain_on_channel)
1026                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1027
1028         /* mac80211 based drivers don't support internal TDLS setup */
1029         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1030                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1031
1032         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1033         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1034                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1035
1036         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
1037
1038         result = wiphy_register(local->hw.wiphy);
1039         if (result < 0)
1040                 goto fail_wiphy_register;
1041
1042         /*
1043          * We use the number of queues for feature tests (QoS, HT) internally
1044          * so restrict them appropriately.
1045          */
1046         if (hw->queues > IEEE80211_MAX_QUEUES)
1047                 hw->queues = IEEE80211_MAX_QUEUES;
1048
1049         local->workqueue =
1050                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1051         if (!local->workqueue) {
1052                 result = -ENOMEM;
1053                 goto fail_workqueue;
1054         }
1055
1056         /*
1057          * The hardware needs headroom for sending the frame,
1058          * and we need some headroom for passing the frame to monitor
1059          * interfaces, but never both at the same time.
1060          */
1061         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1062                                    IEEE80211_TX_STATUS_HEADROOM);
1063
1064         debugfs_hw_add(local);
1065
1066         /*
1067          * if the driver doesn't specify a max listen interval we
1068          * use 5 which should be a safe default
1069          */
1070         if (local->hw.max_listen_interval == 0)
1071                 local->hw.max_listen_interval = 5;
1072
1073         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1074
1075         local->dynamic_ps_forced_timeout = -1;
1076
1077         if (!local->hw.max_nan_de_entries)
1078                 local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1079
1080         result = ieee80211_wep_init(local);
1081         if (result < 0)
1082                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1083                             result);
1084
1085         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1086
1087         ieee80211_led_init(local);
1088
1089         rtnl_lock();
1090
1091         result = ieee80211_init_rate_ctrl_alg(local,
1092                                               hw->rate_control_algorithm);
1093         if (result < 0) {
1094                 wiphy_debug(local->hw.wiphy,
1095                             "Failed to initialize rate control algorithm\n");
1096                 goto fail_rate;
1097         }
1098
1099         /* add one default STA interface if supported */
1100         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1101             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1102                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1103                                           NL80211_IFTYPE_STATION, NULL);
1104                 if (result)
1105                         wiphy_warn(local->hw.wiphy,
1106                                    "Failed to add default virtual iface\n");
1107         }
1108
1109         rtnl_unlock();
1110
1111         result = ieee80211_txq_setup_flows(local);
1112         if (result)
1113                 goto fail_flows;
1114
1115 #ifdef CONFIG_INET
1116         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1117         result = register_inetaddr_notifier(&local->ifa_notifier);
1118         if (result)
1119                 goto fail_ifa;
1120 #endif
1121
1122 #if IS_ENABLED(CONFIG_IPV6)
1123         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1124         result = register_inet6addr_notifier(&local->ifa6_notifier);
1125         if (result)
1126                 goto fail_ifa6;
1127 #endif
1128
1129         return 0;
1130
1131 #if IS_ENABLED(CONFIG_IPV6)
1132  fail_ifa6:
1133 #ifdef CONFIG_INET
1134         unregister_inetaddr_notifier(&local->ifa_notifier);
1135 #endif
1136 #endif
1137 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1138  fail_ifa:
1139 #endif
1140         ieee80211_txq_teardown_flows(local);
1141  fail_flows:
1142         rtnl_lock();
1143         rate_control_deinitialize(local);
1144         ieee80211_remove_interfaces(local);
1145  fail_rate:
1146         rtnl_unlock();
1147         ieee80211_led_exit(local);
1148         ieee80211_wep_free(local);
1149         destroy_workqueue(local->workqueue);
1150  fail_workqueue:
1151         wiphy_unregister(local->hw.wiphy);
1152  fail_wiphy_register:
1153         if (local->wiphy_ciphers_allocated)
1154                 kfree(local->hw.wiphy->cipher_suites);
1155         kfree(local->int_scan_req);
1156         return result;
1157 }
1158 EXPORT_SYMBOL(ieee80211_register_hw);
1159
1160 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1161 {
1162         struct ieee80211_local *local = hw_to_local(hw);
1163
1164         tasklet_kill(&local->tx_pending_tasklet);
1165         tasklet_kill(&local->tasklet);
1166
1167 #ifdef CONFIG_INET
1168         unregister_inetaddr_notifier(&local->ifa_notifier);
1169 #endif
1170 #if IS_ENABLED(CONFIG_IPV6)
1171         unregister_inet6addr_notifier(&local->ifa6_notifier);
1172 #endif
1173
1174         rtnl_lock();
1175
1176         /*
1177          * At this point, interface list manipulations are fine
1178          * because the driver cannot be handing us frames any
1179          * more and the tasklet is killed.
1180          */
1181         ieee80211_remove_interfaces(local);
1182
1183         rtnl_unlock();
1184
1185         cancel_delayed_work_sync(&local->roc_work);
1186         cancel_work_sync(&local->restart_work);
1187         cancel_work_sync(&local->reconfig_filter);
1188         cancel_work_sync(&local->tdls_chsw_work);
1189         flush_work(&local->sched_scan_stopped_work);
1190         flush_work(&local->radar_detected_work);
1191
1192         ieee80211_clear_tx_pending(local);
1193         rate_control_deinitialize(local);
1194
1195         if (skb_queue_len(&local->skb_queue) ||
1196             skb_queue_len(&local->skb_queue_unreliable))
1197                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1198         skb_queue_purge(&local->skb_queue);
1199         skb_queue_purge(&local->skb_queue_unreliable);
1200         skb_queue_purge(&local->skb_queue_tdls_chsw);
1201         ieee80211_txq_teardown_flows(local);
1202
1203         destroy_workqueue(local->workqueue);
1204         wiphy_unregister(local->hw.wiphy);
1205         ieee80211_wep_free(local);
1206         ieee80211_led_exit(local);
1207         kfree(local->int_scan_req);
1208 }
1209 EXPORT_SYMBOL(ieee80211_unregister_hw);
1210
1211 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1212 {
1213         WARN_ONCE(1, "Have pending ack frames!\n");
1214         kfree_skb(p);
1215         return 0;
1216 }
1217
1218 void ieee80211_free_hw(struct ieee80211_hw *hw)
1219 {
1220         struct ieee80211_local *local = hw_to_local(hw);
1221
1222         mutex_destroy(&local->iflist_mtx);
1223         mutex_destroy(&local->mtx);
1224
1225         if (local->wiphy_ciphers_allocated)
1226                 kfree(local->hw.wiphy->cipher_suites);
1227
1228         idr_for_each(&local->ack_status_frames,
1229                      ieee80211_free_ack_frame, NULL);
1230         idr_destroy(&local->ack_status_frames);
1231
1232         sta_info_stop(local);
1233
1234         ieee80211_free_led_names(local);
1235
1236         wiphy_free(local->hw.wiphy);
1237 }
1238 EXPORT_SYMBOL(ieee80211_free_hw);
1239
1240 static int __init ieee80211_init(void)
1241 {
1242         struct sk_buff *skb;
1243         int ret;
1244
1245         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1246         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1247                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1248
1249         ret = rc80211_minstrel_init();
1250         if (ret)
1251                 return ret;
1252
1253         ret = rc80211_minstrel_ht_init();
1254         if (ret)
1255                 goto err_minstrel;
1256
1257         ret = ieee80211_iface_init();
1258         if (ret)
1259                 goto err_netdev;
1260
1261         return 0;
1262  err_netdev:
1263         rc80211_minstrel_ht_exit();
1264  err_minstrel:
1265         rc80211_minstrel_exit();
1266
1267         return ret;
1268 }
1269
1270 static void __exit ieee80211_exit(void)
1271 {
1272         rc80211_minstrel_ht_exit();
1273         rc80211_minstrel_exit();
1274
1275         ieee80211s_stop();
1276
1277         ieee80211_iface_exit();
1278
1279         rcu_barrier();
1280 }
1281
1282
1283 subsys_initcall(ieee80211_init);
1284 module_exit(ieee80211_exit);
1285
1286 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1287 MODULE_LICENSE("GPL");