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  * 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         rtnl_lock();
 257         list_for_each_entry(sdata, &local->interfaces, list)
 258                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 259         ieee80211_scan_cancel(local);
 260
 261         /* make sure any new ROC will consider local->in_reconfig */
 262         flush_delayed_work(&local->roc_work);
 263         flush_work(&local->hw_roc_done);
 264
 265         ieee80211_reconfig(local);
 266         rtnl_unlock();
 267 }
 268
 269 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 270 {
 271         struct ieee80211_local *local = hw_to_local(hw);
 272
 273         trace_api_restart_hw(local);
 274
 275         wiphy_info(hw->wiphy,
 276                    "Hardware restart was requested\n");
 277
 278         /* use this reason, ieee80211_reconfig will unblock it */
 279         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 280                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 281                                         false);
 282
 283         /*
 284          * Stop all Rx during the reconfig. We don't want state changes
 285          * or driver callbacks while this is in progress.
 286          */
 287         local->in_reconfig = true;
 288         barrier();
 289
 290         queue_work(system_freezable_wq, &local->restart_work);
 291 }
 292 EXPORT_SYMBOL(ieee80211_restart_hw);
 293
 294 #ifdef CONFIG_INET
 295 static int ieee80211_ifa_changed(struct notifier_block *nb,
 296                                  unsigned long data, void *arg)
 297 {
 298         struct in_ifaddr *ifa = arg;
 299         struct ieee80211_local *local =
 300                 container_of(nb, struct ieee80211_local,
 301                              ifa_notifier);
 302         struct net_device *ndev = ifa->ifa_dev->dev;
 303         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 304         struct in_device *idev;
 305         struct ieee80211_sub_if_data *sdata;
 306         struct ieee80211_bss_conf *bss_conf;
 307         struct ieee80211_if_managed *ifmgd;
 308         int c = 0;
 309
 310         /* Make sure it's our interface that got changed */
 311         if (!wdev)
 312                 return NOTIFY_DONE;
 313
 314         if (wdev->wiphy != local->hw.wiphy)
 315                 return NOTIFY_DONE;
 316
 317         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 318         bss_conf = &sdata->vif.bss_conf;
 319
 320         /* ARP filtering is only supported in managed mode */
 321         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 322                 return NOTIFY_DONE;
 323
 324         idev = __in_dev_get_rtnl(sdata->dev);
 325         if (!idev)
 326                 return NOTIFY_DONE;
 327
 328         ifmgd = &sdata->u.mgd;
 329         sdata_lock(sdata);
 330
 331         /* Copy the addresses to the bss_conf list */
 332         ifa = idev->ifa_list;
 333         while (ifa) {
 334                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 335                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 336                 ifa = ifa->ifa_next;
 337                 c++;
 338         }
 339
 340         bss_conf->arp_addr_cnt = c;
 341
 342         /* Configure driver only if associated (which also implies it is up) */
 343         if (ifmgd->associated)
 344                 ieee80211_bss_info_change_notify(sdata,
 345                                                  BSS_CHANGED_ARP_FILTER);
 346
 347         sdata_unlock(sdata);
 348
 349         return NOTIFY_OK;
 350 }
 351 #endif
 352
 353 #if IS_ENABLED(CONFIG_IPV6)
 354 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 355                                   unsigned long data, void *arg)
 356 {
 357         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 358         struct inet6_dev *idev = ifa->idev;
 359         struct net_device *ndev = ifa->idev->dev;
 360         struct ieee80211_local *local =
 361                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 362         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 363         struct ieee80211_sub_if_data *sdata;
 364
 365         /* Make sure it's our interface that got changed */
 366         if (!wdev || wdev->wiphy != local->hw.wiphy)
 367                 return NOTIFY_DONE;
 368
 369         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 370
 371         /*
 372          * For now only support station mode. This is mostly because
 373          * doing AP would have to handle AP_VLAN in some way ...
 374          */
 375         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 376                 return NOTIFY_DONE;
 377
 378         drv_ipv6_addr_change(local, sdata, idev);
 379
 380         return NOTIFY_OK;
 381 }
 382 #endif
 383
 384 /* There isn't a lot of sense in it, but you can transmit anything you like */
 385 static const struct ieee80211_txrx_stypes
 386 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 387         [NL80211_IFTYPE_ADHOC] = {
 388                 .tx = 0xffff,
 389                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 390                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 391                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 392                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 393         },
 394         [NL80211_IFTYPE_STATION] = {
 395                 .tx = 0xffff,
 396                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 398         },
 399         [NL80211_IFTYPE_AP] = {
 400                 .tx = 0xffff,
 401                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 402                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 403                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 404                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 405                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 406                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 407                         BIT(IEEE80211_STYPE_ACTION >> 4),
 408         },
 409         [NL80211_IFTYPE_AP_VLAN] = {
 410                 /* copy AP */
 411                 .tx = 0xffff,
 412                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 413                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 414                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 415                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 416                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 417                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 418                         BIT(IEEE80211_STYPE_ACTION >> 4),
 419         },
 420         [NL80211_IFTYPE_P2P_CLIENT] = {
 421                 .tx = 0xffff,
 422                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 423                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 424         },
 425         [NL80211_IFTYPE_P2P_GO] = {
 426                 .tx = 0xffff,
 427                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 428                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 429                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 430                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 431                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 432                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 433                         BIT(IEEE80211_STYPE_ACTION >> 4),
 434         },
 435         [NL80211_IFTYPE_MESH_POINT] = {
 436                 .tx = 0xffff,
 437                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 438                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 439                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 440         },
 441         [NL80211_IFTYPE_P2P_DEVICE] = {
 442                 .tx = 0xffff,
 443                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 444                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 445         },
 446 };
 447
 448 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 449         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 450                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 451
 452         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 453                                 IEEE80211_HT_CAP_MAX_AMSDU |
 454                                 IEEE80211_HT_CAP_SGI_20 |
 455                                 IEEE80211_HT_CAP_SGI_40 |
 456                                 IEEE80211_HT_CAP_LDPC_CODING |
 457                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
 458         .mcs = {
 459                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 460                              0xff, 0xff, 0xff, 0xff, 0xff, },
 461         },
 462 };
 463
 464 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 465         .vht_cap_info =
 466                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 467                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 468                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 469                             IEEE80211_VHT_CAP_RXSTBC_1 |
 470                             IEEE80211_VHT_CAP_RXSTBC_2 |
 471                             IEEE80211_VHT_CAP_RXSTBC_3 |
 472                             IEEE80211_VHT_CAP_RXSTBC_4 |
 473                             IEEE80211_VHT_CAP_TXSTBC |
 474                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 475                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 476                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 477                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 478                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 479         .supp_mcs = {
 480                 .rx_mcs_map = cpu_to_le16(~0),
 481                 .tx_mcs_map = cpu_to_le16(~0),
 482         },
 483 };
 484
 485 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 486                                            const struct ieee80211_ops *ops,
 487                                            const char *requested_name)
 488 {
 489         struct ieee80211_local *local;
 490         int priv_size, i;
 491         struct wiphy *wiphy;
 492         bool use_chanctx;
 493
 494         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 495                     !ops->add_interface || !ops->remove_interface ||
 496                     !ops->configure_filter))
 497                 return NULL;
 498
 499         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 500                 return NULL;
 501
 502         /* check all or no channel context operations exist */
 503         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 504             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 505             !!ops->unassign_vif_chanctx;
 506         if (WARN_ON(i != 0 && i != 5))
 507                 return NULL;
 508         use_chanctx = i == 5;
 509
 510         /* Ensure 32-byte alignment of our private data and hw private data.
 511          * We use the wiphy priv data for both our ieee80211_local and for
 512          * the driver's private data
 513          *
 514          * In memory it'll be like this:
 515          *
 516          * +-------------------------+
 517          * | struct wiphy           |
 518          * +-------------------------+
 519          * | struct ieee80211_local  |
 520          * +-------------------------+
 521          * | driver's private data   |
 522          * +-------------------------+
 523          *
 524          */
 525         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 526
 527         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
 528
 529         if (!wiphy)
 530                 return NULL;
 531
 532         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 533
 534         wiphy->privid = mac80211_wiphy_privid;
 535
 536         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 537                         WIPHY_FLAG_4ADDR_AP |
 538                         WIPHY_FLAG_4ADDR_STATION |
 539                         WIPHY_FLAG_REPORTS_OBSS |
 540                         WIPHY_FLAG_OFFCHAN_TX;
 541
 542         if (ops->remain_on_channel)
 543                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 544
 545         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 546                            NL80211_FEATURE_SAE |
 547                            NL80211_FEATURE_HT_IBSS |
 548                            NL80211_FEATURE_VIF_TXPOWER |
 549                            NL80211_FEATURE_MAC_ON_CREATE |
 550                            NL80211_FEATURE_USERSPACE_MPM |
 551                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 552
 553         if (!ops->hw_scan)
 554                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 555                                    NL80211_FEATURE_AP_SCAN;
 556
 557
 558         if (!ops->set_key)
 559                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 560
 561         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
 562
 563         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 564
 565         local = wiphy_priv(wiphy);
 566
 567         if (sta_info_init(local))
 568                 goto err_free;
 569
 570         local->hw.wiphy = wiphy;
 571
 572         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 573
 574         local->ops = ops;
 575         local->use_chanctx = use_chanctx;
 576
 577         /* set up some defaults */
 578         local->hw.queues = 1;
 579         local->hw.max_rates = 1;
 580         local->hw.max_report_rates = 0;
 581         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 582         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 583         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 584         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 585         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 586         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 587                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 588                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 589         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 590                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 591         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 592         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 593         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 594         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 595         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 596
 597         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
 598
 599         wiphy->extended_capabilities = local->ext_capa;
 600         wiphy->extended_capabilities_mask = local->ext_capa;
 601         wiphy->extended_capabilities_len =
 602                 ARRAY_SIZE(local->ext_capa);
 603
 604         INIT_LIST_HEAD(&local->interfaces);
 605
 606         __hw_addr_init(&local->mc_list);
 607
 608         mutex_init(&local->iflist_mtx);
 609         mutex_init(&local->mtx);
 610
 611         mutex_init(&local->key_mtx);
 612         spin_lock_init(&local->filter_lock);
 613         spin_lock_init(&local->rx_path_lock);
 614         spin_lock_init(&local->queue_stop_reason_lock);
 615
 616         INIT_LIST_HEAD(&local->chanctx_list);
 617         mutex_init(&local->chanctx_mtx);
 618
 619         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 620
 621         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 622
 623         INIT_WORK(&local->radar_detected_work,
 624                   ieee80211_dfs_radar_detected_work);
 625
 626         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 627         local->smps_mode = IEEE80211_SMPS_OFF;
 628
 629         INIT_WORK(&local->dynamic_ps_enable_work,
 630                   ieee80211_dynamic_ps_enable_work);
 631         INIT_WORK(&local->dynamic_ps_disable_work,
 632                   ieee80211_dynamic_ps_disable_work);
 633         setup_timer(&local->dynamic_ps_timer,
 634                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 635
 636         INIT_WORK(&local->sched_scan_stopped_work,
 637                   ieee80211_sched_scan_stopped_work);
 638
 639         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
 640
 641         spin_lock_init(&local->ack_status_lock);
 642         idr_init(&local->ack_status_frames);
 643
 644         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 645                 skb_queue_head_init(&local->pending[i]);
 646                 atomic_set(&local->agg_queue_stop[i], 0);
 647         }
 648         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 649                      (unsigned long)local);
 650
 651         tasklet_init(&local->tasklet,
 652                      ieee80211_tasklet_handler,
 653                      (unsigned long) local);
 654
 655         skb_queue_head_init(&local->skb_queue);
 656         skb_queue_head_init(&local->skb_queue_unreliable);
 657         skb_queue_head_init(&local->skb_queue_tdls_chsw);
 658
 659         ieee80211_alloc_led_names(local);
 660
 661         ieee80211_roc_setup(local);
 662
 663         local->hw.radiotap_timestamp.units_pos = -1;
 664         local->hw.radiotap_timestamp.accuracy = -1;
 665
 666         return &local->hw;
 667  err_free:
 668         wiphy_free(wiphy);
 669         return NULL;
 670 }
 671 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
 672
 673 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 674 {
 675         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
 676                           IS_ERR(local->wep_rx_tfm));
 677         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
 678         int n_suites = 0, r = 0, w = 0;
 679         u32 *suites;
 680         static const u32 cipher_suites[] = {
 681                 /* keep WEP first, it may be removed below */
 682                 WLAN_CIPHER_SUITE_WEP40,
 683                 WLAN_CIPHER_SUITE_WEP104,
 684                 WLAN_CIPHER_SUITE_TKIP,
 685                 WLAN_CIPHER_SUITE_CCMP,
 686                 WLAN_CIPHER_SUITE_CCMP_256,
 687                 WLAN_CIPHER_SUITE_GCMP,
 688                 WLAN_CIPHER_SUITE_GCMP_256,
 689
 690                 /* keep last -- depends on hw flags! */
 691                 WLAN_CIPHER_SUITE_AES_CMAC,
 692                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
 693                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
 694                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
 695         };
 696
 697         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
 698             local->hw.wiphy->cipher_suites) {
 699                 /* If the driver advertises, or doesn't support SW crypto,
 700                  * we only need to remove WEP if necessary.
 701                  */
 702                 if (have_wep)
 703                         return 0;
 704
 705                 /* well if it has _no_ ciphers ... fine */
 706                 if (!local->hw.wiphy->n_cipher_suites)
 707                         return 0;
 708
 709                 /* Driver provides cipher suites, but we need to exclude WEP */
 710                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 711                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 712                                  GFP_KERNEL);
 713                 if (!suites)
 714                         return -ENOMEM;
 715
 716                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 717                         u32 suite = local->hw.wiphy->cipher_suites[r];
 718
 719                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 720                             suite == WLAN_CIPHER_SUITE_WEP104)
 721                                 continue;
 722                         suites[w++] = suite;
 723                 }
 724         } else if (!local->hw.cipher_schemes) {
 725                 /* If the driver doesn't have cipher schemes, there's nothing
 726                  * else to do other than assign the (software supported and
 727                  * perhaps offloaded) cipher suites.
 728                  */
 729                 local->hw.wiphy->cipher_suites = cipher_suites;
 730                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 731
 732                 if (!have_mfp)
 733                         local->hw.wiphy->n_cipher_suites -= 4;
 734
 735                 if (!have_wep) {
 736                         local->hw.wiphy->cipher_suites += 2;
 737                         local->hw.wiphy->n_cipher_suites -= 2;
 738                 }
 739
 740                 /* not dynamically allocated, so just return */
 741                 return 0;
 742         } else {
 743                 const struct ieee80211_cipher_scheme *cs;
 744
 745                 cs = local->hw.cipher_schemes;
 746
 747                 /* Driver specifies cipher schemes only (but not cipher suites
 748                  * including the schemes)
 749                  *
 750                  * We start counting ciphers defined by schemes, TKIP, CCMP,
 751                  * CCMP-256, GCMP, and GCMP-256
 752                  */
 753                 n_suites = local->hw.n_cipher_schemes + 5;
 754
 755                 /* check if we have WEP40 and WEP104 */
 756                 if (have_wep)
 757                         n_suites += 2;
 758
 759                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
 760                  * BIP-GMAC-256
 761                  */
 762                 if (have_mfp)
 763                         n_suites += 4;
 764
 765                 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
 766                 if (!suites)
 767                         return -ENOMEM;
 768
 769                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 770                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
 771                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 772                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
 773                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
 774
 775                 if (have_wep) {
 776                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 777                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 778                 }
 779
 780                 if (have_mfp) {
 781                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 782                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
 783                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
 784                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
 785                 }
 786
 787                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
 788                         suites[w++] = cs[r].cipher;
 789                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
 790                                 kfree(suites);
 791                                 return -EINVAL;
 792                         }
 793                 }
 794         }
 795
 796         local->hw.wiphy->cipher_suites = suites;
 797         local->hw.wiphy->n_cipher_suites = w;
 798         local->wiphy_ciphers_allocated = true;
 799
 800         return 0;
 801 }
 802
 803 int ieee80211_register_hw(struct ieee80211_hw *hw)
 804 {
 805         struct ieee80211_local *local = hw_to_local(hw);
 806         int result, i;
 807         enum nl80211_band band;
 808         int channels, max_bitrates;
 809         bool supp_ht, supp_vht;
 810         netdev_features_t feature_whitelist;
 811         struct cfg80211_chan_def dflt_chandef = {};
 812
 813         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
 814             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 815              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 816                 return -EINVAL;
 817
 818         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 819             (!local->ops->tdls_channel_switch ||
 820              !local->ops->tdls_cancel_channel_switch ||
 821              !local->ops->tdls_recv_channel_switch))
 822                 return -EOPNOTSUPP;
 823
 824         if (WARN_ON(local->hw.wiphy->interface_modes &
 825                         BIT(NL80211_IFTYPE_NAN) &&
 826                     (!local->ops->start_nan || !local->ops->stop_nan)))
 827                 return -EINVAL;
 828
 829 #ifdef CONFIG_PM
 830         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 831                 return -EINVAL;
 832 #endif
 833
 834         if (!local->use_chanctx) {
 835                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 836                         const struct ieee80211_iface_combination *comb;
 837
 838                         comb = &local->hw.wiphy->iface_combinations[i];
 839
 840                         if (comb->num_different_channels > 1)
 841                                 return -EINVAL;
 842                 }
 843         } else {
 844                 /*
 845                  * WDS is currently prohibited when channel contexts are used
 846                  * because there's no clear definition of which channel WDS
 847                  * type interfaces use
 848                  */
 849                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 850                         return -EINVAL;
 851
 852                 /* DFS is not supported with multi-channel combinations yet */
 853                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 854                         const struct ieee80211_iface_combination *comb;
 855
 856                         comb = &local->hw.wiphy->iface_combinations[i];
 857
 858                         if (comb->radar_detect_widths &&
 859                             comb->num_different_channels > 1)
 860                                 return -EINVAL;
 861                 }
 862         }
 863
 864         /* Only HW csum features are currently compatible with mac80211 */
 865         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 866                             NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
 867                             NETIF_F_GSO_SOFTWARE | NETIF_F_RXCSUM;
 868         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 869                 return -EINVAL;
 870
 871         if (hw->max_report_rates == 0)
 872                 hw->max_report_rates = hw->max_rates;
 873
 874         local->rx_chains = 1;
 875
 876         /*
 877          * generic code guarantees at least one band,
 878          * set this very early because much code assumes
 879          * that hw.conf.channel is assigned
 880          */
 881         channels = 0;
 882         max_bitrates = 0;
 883         supp_ht = false;
 884         supp_vht = false;
 885         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 886                 struct ieee80211_supported_band *sband;
 887
 888                 sband = local->hw.wiphy->bands[band];
 889                 if (!sband)
 890                         continue;
 891
 892                 if (!dflt_chandef.chan) {
 893                         cfg80211_chandef_create(&dflt_chandef,
 894                                                 &sband->channels[0],
 895                                                 NL80211_CHAN_NO_HT);
 896                         /* init channel we're on */
 897                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 898                                 local->hw.conf.chandef = dflt_chandef;
 899                                 local->_oper_chandef = dflt_chandef;
 900                         }
 901                         local->monitor_chandef = dflt_chandef;
 902                 }
 903
 904                 channels += sband->n_channels;
 905
 906                 if (max_bitrates < sband->n_bitrates)
 907                         max_bitrates = sband->n_bitrates;
 908                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 909                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 910
 911                 if (sband->ht_cap.ht_supported)
 912                         local->rx_chains =
 913                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 914                                     local->rx_chains);
 915
 916                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 917         }
 918
 919         /* if low-level driver supports AP, we also support VLAN */
 920         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 921                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 922                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 923         }
 924
 925         /* mac80211 always supports monitor */
 926         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 927         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 928
 929         /* mac80211 doesn't support more than one IBSS interface right now */
 930         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 931                 const struct ieee80211_iface_combination *c;
 932                 int j;
 933
 934                 c = &hw->wiphy->iface_combinations[i];
 935
 936                 for (j = 0; j < c->n_limits; j++)
 937                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 938                             c->limits[j].max > 1)
 939                                 return -EINVAL;
 940         }
 941
 942         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 943                                       sizeof(void *) * channels, GFP_KERNEL);
 944         if (!local->int_scan_req)
 945                 return -ENOMEM;
 946
 947         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 948                 if (!local->hw.wiphy->bands[band])
 949                         continue;
 950                 local->int_scan_req->rates[band] = (u32) -1;
 951         }
 952
 953 #ifndef CONFIG_MAC80211_MESH
 954         /* mesh depends on Kconfig, but drivers should set it if they want */
 955         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 956 #endif
 957
 958         /* if the underlying driver supports mesh, mac80211 will (at least)
 959          * provide routing of mesh authentication frames to userspace */
 960         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 961                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 962
 963         /* mac80211 supports control port protocol changing */
 964         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 965
 966         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
 967                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 968         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
 969                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 970                 if (hw->max_signal <= 0) {
 971                         result = -EINVAL;
 972                         goto fail_wiphy_register;
 973                 }
 974         }
 975
 976         /*
 977          * Calculate scan IE length -- we need this to alloc
 978          * memory and to subtract from the driver limit. It
 979          * includes the DS Params, (extended) supported rates, and HT
 980          * information -- SSID is the driver's responsibility.
 981          */
 982         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 983                 3 /* DS Params */;
 984         if (supp_ht)
 985                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 986
 987         if (supp_vht)
 988                 local->scan_ies_len +=
 989                         2 + sizeof(struct ieee80211_vht_cap);
 990
 991         if (!local->ops->hw_scan) {
 992                 /* For hw_scan, driver needs to set these up. */
 993                 local->hw.wiphy->max_scan_ssids = 4;
 994                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 995         }
 996
 997         /*
 998          * If the driver supports any scan IEs, then assume the
 999          * limit includes the IEs mac80211 will add, otherwise
1000          * leave it at zero and let the driver sort it out; we
1001          * still pass our IEs to the driver but userspace will
1002          * not be allowed to in that case.
1003          */
1004         if (local->hw.wiphy->max_scan_ie_len)
1005                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1006
1007         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1008                                          local->hw.n_cipher_schemes));
1009
1010         result = ieee80211_init_cipher_suites(local);
1011         if (result < 0)
1012                 goto fail_wiphy_register;
1013
1014         if (!local->ops->remain_on_channel)
1015                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1016
1017         /* mac80211 based drivers don't support internal TDLS setup */
1018         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1019                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1020
1021         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1022         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1023                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1024
1025         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
1026
1027         result = wiphy_register(local->hw.wiphy);
1028         if (result < 0)
1029                 goto fail_wiphy_register;
1030
1031         /*
1032          * We use the number of queues for feature tests (QoS, HT) internally
1033          * so restrict them appropriately.
1034          */
1035         if (hw->queues > IEEE80211_MAX_QUEUES)
1036                 hw->queues = IEEE80211_MAX_QUEUES;
1037
1038         local->workqueue =
1039                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1040         if (!local->workqueue) {
1041                 result = -ENOMEM;
1042                 goto fail_workqueue;
1043         }
1044
1045         /*
1046          * The hardware needs headroom for sending the frame,
1047          * and we need some headroom for passing the frame to monitor
1048          * interfaces, but never both at the same time.
1049          */
1050         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1051                                    IEEE80211_TX_STATUS_HEADROOM);
1052
1053         debugfs_hw_add(local);
1054
1055         /*
1056          * if the driver doesn't specify a max listen interval we
1057          * use 5 which should be a safe default
1058          */
1059         if (local->hw.max_listen_interval == 0)
1060                 local->hw.max_listen_interval = 5;
1061
1062         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1063
1064         local->dynamic_ps_forced_timeout = -1;
1065
1066         if (!local->hw.max_nan_de_entries)
1067                 local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1068
1069         result = ieee80211_wep_init(local);
1070         if (result < 0)
1071                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1072                             result);
1073
1074         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1075
1076         ieee80211_led_init(local);
1077
1078         rtnl_lock();
1079
1080         result = ieee80211_init_rate_ctrl_alg(local,
1081                                               hw->rate_control_algorithm);
1082         if (result < 0) {
1083                 wiphy_debug(local->hw.wiphy,
1084                             "Failed to initialize rate control algorithm\n");
1085                 goto fail_rate;
1086         }
1087
1088         /* add one default STA interface if supported */
1089         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1090             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1091                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1092                                           NL80211_IFTYPE_STATION, NULL);
1093                 if (result)
1094                         wiphy_warn(local->hw.wiphy,
1095                                    "Failed to add default virtual iface\n");
1096         }
1097
1098         rtnl_unlock();
1099
1100         result = ieee80211_txq_setup_flows(local);
1101         if (result)
1102                 goto fail_flows;
1103
1104 #ifdef CONFIG_INET
1105         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1106         result = register_inetaddr_notifier(&local->ifa_notifier);
1107         if (result)
1108                 goto fail_ifa;
1109 #endif
1110
1111 #if IS_ENABLED(CONFIG_IPV6)
1112         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1113         result = register_inet6addr_notifier(&local->ifa6_notifier);
1114         if (result)
1115                 goto fail_ifa6;
1116 #endif
1117
1118         return 0;
1119
1120 #if IS_ENABLED(CONFIG_IPV6)
1121  fail_ifa6:
1122 #ifdef CONFIG_INET
1123         unregister_inetaddr_notifier(&local->ifa_notifier);
1124 #endif
1125 #endif
1126 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1127  fail_ifa:
1128 #endif
1129         ieee80211_txq_teardown_flows(local);
1130  fail_flows:
1131         rtnl_lock();
1132         rate_control_deinitialize(local);
1133         ieee80211_remove_interfaces(local);
1134  fail_rate:
1135         rtnl_unlock();
1136         ieee80211_led_exit(local);
1137         ieee80211_wep_free(local);
1138         destroy_workqueue(local->workqueue);
1139  fail_workqueue:
1140         wiphy_unregister(local->hw.wiphy);
1141  fail_wiphy_register:
1142         if (local->wiphy_ciphers_allocated)
1143                 kfree(local->hw.wiphy->cipher_suites);
1144         kfree(local->int_scan_req);
1145         return result;
1146 }
1147 EXPORT_SYMBOL(ieee80211_register_hw);
1148
1149 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1150 {
1151         struct ieee80211_local *local = hw_to_local(hw);
1152
1153         tasklet_kill(&local->tx_pending_tasklet);
1154         tasklet_kill(&local->tasklet);
1155
1156 #ifdef CONFIG_INET
1157         unregister_inetaddr_notifier(&local->ifa_notifier);
1158 #endif
1159 #if IS_ENABLED(CONFIG_IPV6)
1160         unregister_inet6addr_notifier(&local->ifa6_notifier);
1161 #endif
1162
1163         rtnl_lock();
1164
1165         /*
1166          * At this point, interface list manipulations are fine
1167          * because the driver cannot be handing us frames any
1168          * more and the tasklet is killed.
1169          */
1170         ieee80211_remove_interfaces(local);
1171
1172         rtnl_unlock();
1173
1174         cancel_delayed_work_sync(&local->roc_work);
1175         cancel_work_sync(&local->restart_work);
1176         cancel_work_sync(&local->reconfig_filter);
1177         cancel_work_sync(&local->tdls_chsw_work);
1178         flush_work(&local->sched_scan_stopped_work);
1179
1180         ieee80211_clear_tx_pending(local);
1181         rate_control_deinitialize(local);
1182
1183         if (skb_queue_len(&local->skb_queue) ||
1184             skb_queue_len(&local->skb_queue_unreliable))
1185                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1186         skb_queue_purge(&local->skb_queue);
1187         skb_queue_purge(&local->skb_queue_unreliable);
1188         skb_queue_purge(&local->skb_queue_tdls_chsw);
1189         ieee80211_txq_teardown_flows(local);
1190
1191         destroy_workqueue(local->workqueue);
1192         wiphy_unregister(local->hw.wiphy);
1193         ieee80211_wep_free(local);
1194         ieee80211_led_exit(local);
1195         kfree(local->int_scan_req);
1196 }
1197 EXPORT_SYMBOL(ieee80211_unregister_hw);
1198
1199 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1200 {
1201         WARN_ONCE(1, "Have pending ack frames!\n");
1202         kfree_skb(p);
1203         return 0;
1204 }
1205
1206 void ieee80211_free_hw(struct ieee80211_hw *hw)
1207 {
1208         struct ieee80211_local *local = hw_to_local(hw);
1209
1210         mutex_destroy(&local->iflist_mtx);
1211         mutex_destroy(&local->mtx);
1212
1213         if (local->wiphy_ciphers_allocated)
1214                 kfree(local->hw.wiphy->cipher_suites);
1215
1216         idr_for_each(&local->ack_status_frames,
1217                      ieee80211_free_ack_frame, NULL);
1218         idr_destroy(&local->ack_status_frames);
1219
1220         sta_info_stop(local);
1221
1222         ieee80211_free_led_names(local);
1223
1224         wiphy_free(local->hw.wiphy);
1225 }
1226 EXPORT_SYMBOL(ieee80211_free_hw);
1227
1228 static int __init ieee80211_init(void)
1229 {
1230         struct sk_buff *skb;
1231         int ret;
1232
1233         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1234         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1235                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1236
1237         ret = rc80211_minstrel_init();
1238         if (ret)
1239                 return ret;
1240
1241         ret = rc80211_minstrel_ht_init();
1242         if (ret)
1243                 goto err_minstrel;
1244
1245         ret = ieee80211_iface_init();
1246         if (ret)
1247                 goto err_netdev;
1248
1249         return 0;
1250  err_netdev:
1251         rc80211_minstrel_ht_exit();
1252  err_minstrel:
1253         rc80211_minstrel_exit();
1254
1255         return ret;
1256 }
1257
1258 static void __exit ieee80211_exit(void)
1259 {
1260         rc80211_minstrel_ht_exit();
1261         rc80211_minstrel_exit();
1262
1263         ieee80211s_stop();
1264
1265         ieee80211_iface_exit();
1266
1267         rcu_barrier();
1268 }
1269
1270
1271 subsys_initcall(ieee80211_init);
1272 module_exit(ieee80211_exit);
1273
1274 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1275 MODULE_LICENSE("GPL");