net/mac80211/main.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright (C) 2017     Intel Deutschland GmbH
   8  * Copyright (C) 2018 - 2019 Intel Corporation
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <linux/module.h>
  13 #include <linux/fips.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         if (local->rx_mcast_action_reg)
  68                 new_flags |= FIF_MCAST_ACTION;
  69
  70         spin_lock_bh(&local->filter_lock);
  71         changed_flags = local->filter_flags ^ new_flags;
  72
  73         mc = drv_prepare_multicast(local, &local->mc_list);
  74         spin_unlock_bh(&local->filter_lock);
  75
  76         /* be a bit nasty */
  77         new_flags |= (1<<31);
  78
  79         drv_configure_filter(local, changed_flags, &new_flags, mc);
  80
  81         WARN_ON(new_flags & (1<<31));
  82
  83         local->filter_flags = new_flags & ~(1<<31);
  84 }
  85
  86 static void ieee80211_reconfig_filter(struct work_struct *work)
  87 {
  88         struct ieee80211_local *local =
  89                 container_of(work, struct ieee80211_local, reconfig_filter);
  90
  91         ieee80211_configure_filter(local);
  92 }
  93
  94 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  95 {
  96         struct ieee80211_sub_if_data *sdata;
  97         struct cfg80211_chan_def chandef = {};
  98         u32 changed = 0;
  99         int power;
 100         u32 offchannel_flag;
 101
 102         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 103
 104         if (local->scan_chandef.chan) {
 105                 chandef = local->scan_chandef;
 106         } else if (local->tmp_channel) {
 107                 chandef.chan = local->tmp_channel;
 108                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 109                 chandef.center_freq1 = chandef.chan->center_freq;
 110                 chandef.freq1_offset = chandef.chan->freq_offset;
 111         } else
 112                 chandef = local->_oper_chandef;
 113
 114         WARN(!cfg80211_chandef_valid(&chandef),
 115              "control:%d.%03d MHz width:%d center: %d.%03d/%d MHz",
 116              chandef.chan->center_freq, chandef.chan->freq_offset,
 117              chandef.width, chandef.center_freq1, chandef.freq1_offset,
 118              chandef.center_freq2);
 119
 120         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
 121                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 122         else
 123                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 124
 125         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 126
 127         if (offchannel_flag ||
 128             !cfg80211_chandef_identical(&local->hw.conf.chandef,
 129                                         &local->_oper_chandef)) {
 130                 local->hw.conf.chandef = chandef;
 131                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 132         }
 133
 134         if (!conf_is_ht(&local->hw.conf)) {
 135                 /*
 136                  * mac80211.h documents that this is only valid
 137                  * when the channel is set to an HT type, and
 138                  * that otherwise STATIC is used.
 139                  */
 140                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 141         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 142                 local->hw.conf.smps_mode = local->smps_mode;
 143                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 144         }
 145
 146         power = ieee80211_chandef_max_power(&chandef);
 147
 148         rcu_read_lock();
 149         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 150                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 151                         continue;
 152                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 153                         continue;
 154                 if (sdata->vif.bss_conf.txpower == INT_MIN)
 155                         continue;
 156                 power = min(power, sdata->vif.bss_conf.txpower);
 157         }
 158         rcu_read_unlock();
 159
 160         if (local->hw.conf.power_level != power) {
 161                 changed |= IEEE80211_CONF_CHANGE_POWER;
 162                 local->hw.conf.power_level = power;
 163         }
 164
 165         return changed;
 166 }
 167
 168 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 169 {
 170         int ret = 0;
 171
 172         might_sleep();
 173
 174         if (!local->use_chanctx)
 175                 changed |= ieee80211_hw_conf_chan(local);
 176         else
 177                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 178                              IEEE80211_CONF_CHANGE_POWER);
 179
 180         if (changed && local->open_count) {
 181                 ret = drv_config(local, changed);
 182                 /*
 183                  * Goal:
 184                  * HW reconfiguration should never fail, the driver has told
 185                  * us what it can support so it should live up to that promise.
 186                  *
 187                  * Current status:
 188                  * rfkill is not integrated with mac80211 and a
 189                  * configuration command can thus fail if hardware rfkill
 190                  * is enabled
 191                  *
 192                  * FIXME: integrate rfkill with mac80211 and then add this
 193                  * WARN_ON() back
 194                  *
 195                  */
 196                 /* WARN_ON(ret); */
 197         }
 198
 199         return ret;
 200 }
 201
 202 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 203                                       u32 changed)
 204 {
 205         struct ieee80211_local *local = sdata->local;
 206
 207         if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 208                 return;
 209
 210         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 211 }
 212
 213 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 214 {
 215         sdata->vif.bss_conf.use_cts_prot = false;
 216         sdata->vif.bss_conf.use_short_preamble = false;
 217         sdata->vif.bss_conf.use_short_slot = false;
 218         return BSS_CHANGED_ERP_CTS_PROT |
 219                BSS_CHANGED_ERP_PREAMBLE |
 220                BSS_CHANGED_ERP_SLOT;
 221 }
 222
 223 static void ieee80211_tasklet_handler(struct tasklet_struct *t)
 224 {
 225         struct ieee80211_local *local = from_tasklet(local, t, tasklet);
 226         struct sk_buff *skb;
 227
 228         while ((skb = skb_dequeue(&local->skb_queue)) ||
 229                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 230                 switch (skb->pkt_type) {
 231                 case IEEE80211_RX_MSG:
 232                         /* Clear skb->pkt_type in order to not confuse kernel
 233                          * netstack. */
 234                         skb->pkt_type = 0;
 235                         ieee80211_rx(&local->hw, skb);
 236                         break;
 237                 case IEEE80211_TX_STATUS_MSG:
 238                         skb->pkt_type = 0;
 239                         ieee80211_tx_status(&local->hw, skb);
 240                         break;
 241                 default:
 242                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 243                              skb->pkt_type);
 244                         dev_kfree_skb(skb);
 245                         break;
 246                 }
 247         }
 248 }
 249
 250 static void ieee80211_restart_work(struct work_struct *work)
 251 {
 252         struct ieee80211_local *local =
 253                 container_of(work, struct ieee80211_local, restart_work);
 254         struct ieee80211_sub_if_data *sdata;
 255
 256         /* wait for scan work complete */
 257         flush_workqueue(local->workqueue);
 258         flush_work(&local->sched_scan_stopped_work);
 259
 260         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 261              "%s called with hardware scan in progress\n", __func__);
 262
 263         flush_work(&local->radar_detected_work);
 264         /* we might do interface manipulations, so need both */
 265         rtnl_lock();
 266         wiphy_lock(local->hw.wiphy);
 267         list_for_each_entry(sdata, &local->interfaces, list) {
 268                 /*
 269                  * XXX: there may be more work for other vif types and even
 270                  * for station mode: a good thing would be to run most of
 271                  * the iface type's dependent _stop (ieee80211_mg_stop,
 272                  * ieee80211_ibss_stop) etc...
 273                  * For now, fix only the specific bug that was seen: race
 274                  * between csa_connection_drop_work and us.
 275                  */
 276                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 277                         /*
 278                          * This worker is scheduled from the iface worker that
 279                          * runs on mac80211's workqueue, so we can't be
 280                          * scheduling this worker after the cancel right here.
 281                          * The exception is ieee80211_chswitch_done.
 282                          * Then we can have a race...
 283                          */
 284                         cancel_work_sync(&sdata->u.mgd.csa_connection_drop_work);
 285                 }
 286                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 287         }
 288         ieee80211_scan_cancel(local);
 289
 290         /* make sure any new ROC will consider local->in_reconfig */
 291         flush_delayed_work(&local->roc_work);
 292         flush_work(&local->hw_roc_done);
 293
 294         /* wait for all packet processing to be done */
 295         synchronize_net();
 296
 297         ieee80211_reconfig(local);
 298         wiphy_unlock(local->hw.wiphy);
 299         rtnl_unlock();
 300 }
 301
 302 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 303 {
 304         struct ieee80211_local *local = hw_to_local(hw);
 305
 306         trace_api_restart_hw(local);
 307
 308         wiphy_info(hw->wiphy,
 309                    "Hardware restart was requested\n");
 310
 311         /* use this reason, ieee80211_reconfig will unblock it */
 312         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 313                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 314                                         false);
 315
 316         /*
 317          * Stop all Rx during the reconfig. We don't want state changes
 318          * or driver callbacks while this is in progress.
 319          */
 320         local->in_reconfig = true;
 321         barrier();
 322
 323         queue_work(system_freezable_wq, &local->restart_work);
 324 }
 325 EXPORT_SYMBOL(ieee80211_restart_hw);
 326
 327 #ifdef CONFIG_INET
 328 static int ieee80211_ifa_changed(struct notifier_block *nb,
 329                                  unsigned long data, void *arg)
 330 {
 331         struct in_ifaddr *ifa = arg;
 332         struct ieee80211_local *local =
 333                 container_of(nb, struct ieee80211_local,
 334                              ifa_notifier);
 335         struct net_device *ndev = ifa->ifa_dev->dev;
 336         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 337         struct in_device *idev;
 338         struct ieee80211_sub_if_data *sdata;
 339         struct ieee80211_bss_conf *bss_conf;
 340         struct ieee80211_if_managed *ifmgd;
 341         int c = 0;
 342
 343         /* Make sure it's our interface that got changed */
 344         if (!wdev)
 345                 return NOTIFY_DONE;
 346
 347         if (wdev->wiphy != local->hw.wiphy)
 348                 return NOTIFY_DONE;
 349
 350         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 351         bss_conf = &sdata->vif.bss_conf;
 352
 353         /* ARP filtering is only supported in managed mode */
 354         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 355                 return NOTIFY_DONE;
 356
 357         idev = __in_dev_get_rtnl(sdata->dev);
 358         if (!idev)
 359                 return NOTIFY_DONE;
 360
 361         ifmgd = &sdata->u.mgd;
 362         sdata_lock(sdata);
 363
 364         /* Copy the addresses to the bss_conf list */
 365         ifa = rtnl_dereference(idev->ifa_list);
 366         while (ifa) {
 367                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 368                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 369                 ifa = rtnl_dereference(ifa->ifa_next);
 370                 c++;
 371         }
 372
 373         bss_conf->arp_addr_cnt = c;
 374
 375         /* Configure driver only if associated (which also implies it is up) */
 376         if (ifmgd->associated)
 377                 ieee80211_bss_info_change_notify(sdata,
 378                                                  BSS_CHANGED_ARP_FILTER);
 379
 380         sdata_unlock(sdata);
 381
 382         return NOTIFY_OK;
 383 }
 384 #endif
 385
 386 #if IS_ENABLED(CONFIG_IPV6)
 387 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 388                                   unsigned long data, void *arg)
 389 {
 390         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 391         struct inet6_dev *idev = ifa->idev;
 392         struct net_device *ndev = ifa->idev->dev;
 393         struct ieee80211_local *local =
 394                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 395         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 396         struct ieee80211_sub_if_data *sdata;
 397
 398         /* Make sure it's our interface that got changed */
 399         if (!wdev || wdev->wiphy != local->hw.wiphy)
 400                 return NOTIFY_DONE;
 401
 402         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 403
 404         /*
 405          * For now only support station mode. This is mostly because
 406          * doing AP would have to handle AP_VLAN in some way ...
 407          */
 408         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 409                 return NOTIFY_DONE;
 410
 411         drv_ipv6_addr_change(local, sdata, idev);
 412
 413         return NOTIFY_OK;
 414 }
 415 #endif
 416
 417 /* There isn't a lot of sense in it, but you can transmit anything you like */
 418 static const struct ieee80211_txrx_stypes
 419 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 420         [NL80211_IFTYPE_ADHOC] = {
 421                 .tx = 0xffff,
 422                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 423                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 424                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 425                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 426         },
 427         [NL80211_IFTYPE_STATION] = {
 428                 .tx = 0xffff,
 429                 /*
 430                  * To support Pre Association Security Negotiation (PASN) while
 431                  * already associated to one AP, allow user space to register to
 432                  * Rx authentication frames, so that the user space logic would
 433                  * be able to receive/handle authentication frames from a
 434                  * different AP as part of PASN.
 435                  * It is expected that user space would intelligently register
 436                  * for Rx authentication frames, i.e., only when PASN is used
 437                  * and configure a match filter only for PASN authentication
 438                  * algorithm, as otherwise the MLME functionality of mac80211
 439                  * would be broken.
 440                  */
 441                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 442                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 443                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 444         },
 445         [NL80211_IFTYPE_AP] = {
 446                 .tx = 0xffff,
 447                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 448                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 450                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 451                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 452                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 453                         BIT(IEEE80211_STYPE_ACTION >> 4),
 454         },
 455         [NL80211_IFTYPE_AP_VLAN] = {
 456                 /* copy AP */
 457                 .tx = 0xffff,
 458                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 459                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 460                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 461                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 462                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 463                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 464                         BIT(IEEE80211_STYPE_ACTION >> 4),
 465         },
 466         [NL80211_IFTYPE_P2P_CLIENT] = {
 467                 .tx = 0xffff,
 468                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 469                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 470         },
 471         [NL80211_IFTYPE_P2P_GO] = {
 472                 .tx = 0xffff,
 473                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 474                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 475                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 476                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 477                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 478                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 479                         BIT(IEEE80211_STYPE_ACTION >> 4),
 480         },
 481         [NL80211_IFTYPE_MESH_POINT] = {
 482                 .tx = 0xffff,
 483                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 484                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 485                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 486         },
 487         [NL80211_IFTYPE_P2P_DEVICE] = {
 488                 .tx = 0xffff,
 489                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 490                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 491         },
 492 };
 493
 494 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 495         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 496                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 497
 498         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 499                                 IEEE80211_HT_CAP_MAX_AMSDU |
 500                                 IEEE80211_HT_CAP_SGI_20 |
 501                                 IEEE80211_HT_CAP_SGI_40 |
 502                                 IEEE80211_HT_CAP_TX_STBC |
 503                                 IEEE80211_HT_CAP_RX_STBC |
 504                                 IEEE80211_HT_CAP_LDPC_CODING |
 505                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
 506         .mcs = {
 507                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 508                              0xff, 0xff, 0xff, 0xff, 0xff, },
 509         },
 510 };
 511
 512 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 513         .vht_cap_info =
 514                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 515                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 516                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 517                             IEEE80211_VHT_CAP_RXSTBC_MASK |
 518                             IEEE80211_VHT_CAP_TXSTBC |
 519                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 520                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 521                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 522                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 523                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 524         .supp_mcs = {
 525                 .rx_mcs_map = cpu_to_le16(~0),
 526                 .tx_mcs_map = cpu_to_le16(~0),
 527         },
 528 };
 529
 530 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 531                                            const struct ieee80211_ops *ops,
 532                                            const char *requested_name)
 533 {
 534         struct ieee80211_local *local;
 535         int priv_size, i;
 536         struct wiphy *wiphy;
 537         bool use_chanctx;
 538
 539         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 540                     !ops->add_interface || !ops->remove_interface ||
 541                     !ops->configure_filter))
 542                 return NULL;
 543
 544         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 545                 return NULL;
 546
 547         /* check all or no channel context operations exist */
 548         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 549             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 550             !!ops->unassign_vif_chanctx;
 551         if (WARN_ON(i != 0 && i != 5))
 552                 return NULL;
 553         use_chanctx = i == 5;
 554
 555         /* Ensure 32-byte alignment of our private data and hw private data.
 556          * We use the wiphy priv data for both our ieee80211_local and for
 557          * the driver's private data
 558          *
 559          * In memory it'll be like this:
 560          *
 561          * +-------------------------+
 562          * | struct wiphy           |
 563          * +-------------------------+
 564          * | struct ieee80211_local  |
 565          * +-------------------------+
 566          * | driver's private data   |
 567          * +-------------------------+
 568          *
 569          */
 570         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 571
 572         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
 573
 574         if (!wiphy)
 575                 return NULL;
 576
 577         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 578
 579         wiphy->privid = mac80211_wiphy_privid;
 580
 581         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 582                         WIPHY_FLAG_4ADDR_AP |
 583                         WIPHY_FLAG_4ADDR_STATION |
 584                         WIPHY_FLAG_REPORTS_OBSS |
 585                         WIPHY_FLAG_OFFCHAN_TX;
 586
 587         if (!use_chanctx || ops->remain_on_channel)
 588                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 589
 590         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 591                            NL80211_FEATURE_SAE |
 592                            NL80211_FEATURE_HT_IBSS |
 593                            NL80211_FEATURE_VIF_TXPOWER |
 594                            NL80211_FEATURE_MAC_ON_CREATE |
 595                            NL80211_FEATURE_USERSPACE_MPM |
 596                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 597         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
 598         wiphy_ext_feature_set(wiphy,
 599                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);
 600         wiphy_ext_feature_set(wiphy,
 601                               NL80211_EXT_FEATURE_CONTROL_PORT_NO_PREAUTH);
 602         wiphy_ext_feature_set(wiphy,
 603                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_TX_STATUS);
 604         wiphy_ext_feature_set(wiphy,
 605                               NL80211_EXT_FEATURE_SCAN_FREQ_KHZ);
 606
 607         if (!ops->hw_scan) {
 608                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 609                                    NL80211_FEATURE_AP_SCAN;
 610                 /*
 611                  * if the driver behaves correctly using the probe request
 612                  * (template) from mac80211, then both of these should be
 613                  * supported even with hw scan - but let drivers opt in.
 614                  */
 615                 wiphy_ext_feature_set(wiphy,
 616                                       NL80211_EXT_FEATURE_SCAN_RANDOM_SN);
 617                 wiphy_ext_feature_set(wiphy,
 618                                       NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT);
 619         }
 620
 621         if (!ops->set_key)
 622                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 623
 624         if (ops->wake_tx_queue)
 625                 wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_TXQS);
 626
 627         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
 628
 629         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 630
 631         local = wiphy_priv(wiphy);
 632
 633         if (sta_info_init(local))
 634                 goto err_free;
 635
 636         local->hw.wiphy = wiphy;
 637
 638         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 639
 640         local->ops = ops;
 641         local->use_chanctx = use_chanctx;
 642
 643         /*
 644          * We need a bit of data queued to build aggregates properly, so
 645          * instruct the TCP stack to allow more than a single ms of data
 646          * to be queued in the stack. The value is a bit-shift of 1
 647          * second, so 7 is ~8ms of queued data. Only affects local TCP
 648          * sockets.
 649          * This is the default, anyhow - drivers may need to override it
 650          * for local reasons (longer buffers, longer completion time, or
 651          * similar).
 652          */
 653         local->hw.tx_sk_pacing_shift = 7;
 654
 655         /* set up some defaults */
 656         local->hw.queues = 1;
 657         local->hw.max_rates = 1;
 658         local->hw.max_report_rates = 0;
 659         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
 660         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
 661         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 662         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 663         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 664         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 665                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 666                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 667         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 668                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 669         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 670         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 671         local->hw.max_mtu = IEEE80211_MAX_DATA_LEN;
 672         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 673         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 674         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 675
 676         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
 677
 678         wiphy->extended_capabilities = local->ext_capa;
 679         wiphy->extended_capabilities_mask = local->ext_capa;
 680         wiphy->extended_capabilities_len =
 681                 ARRAY_SIZE(local->ext_capa);
 682
 683         INIT_LIST_HEAD(&local->interfaces);
 684         INIT_LIST_HEAD(&local->mon_list);
 685
 686         __hw_addr_init(&local->mc_list);
 687
 688         mutex_init(&local->iflist_mtx);
 689         mutex_init(&local->mtx);
 690
 691         mutex_init(&local->key_mtx);
 692         spin_lock_init(&local->filter_lock);
 693         spin_lock_init(&local->rx_path_lock);
 694         spin_lock_init(&local->queue_stop_reason_lock);
 695
 696         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 697                 INIT_LIST_HEAD(&local->active_txqs[i]);
 698                 spin_lock_init(&local->active_txq_lock[i]);
 699                 local->aql_txq_limit_low[i] = IEEE80211_DEFAULT_AQL_TXQ_LIMIT_L;
 700                 local->aql_txq_limit_high[i] =
 701                         IEEE80211_DEFAULT_AQL_TXQ_LIMIT_H;
 702         }
 703
 704         local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX;
 705         local->aql_threshold = IEEE80211_AQL_THRESHOLD;
 706         atomic_set(&local->aql_total_pending_airtime, 0);
 707
 708         INIT_LIST_HEAD(&local->chanctx_list);
 709         mutex_init(&local->chanctx_mtx);
 710
 711         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 712
 713         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 714
 715         INIT_WORK(&local->radar_detected_work,
 716                   ieee80211_dfs_radar_detected_work);
 717
 718         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 719         local->smps_mode = IEEE80211_SMPS_OFF;
 720
 721         INIT_WORK(&local->dynamic_ps_enable_work,
 722                   ieee80211_dynamic_ps_enable_work);
 723         INIT_WORK(&local->dynamic_ps_disable_work,
 724                   ieee80211_dynamic_ps_disable_work);
 725         timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0);
 726
 727         INIT_WORK(&local->sched_scan_stopped_work,
 728                   ieee80211_sched_scan_stopped_work);
 729
 730         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
 731
 732         spin_lock_init(&local->ack_status_lock);
 733         idr_init(&local->ack_status_frames);
 734
 735         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 736                 skb_queue_head_init(&local->pending[i]);
 737                 atomic_set(&local->agg_queue_stop[i], 0);
 738         }
 739         tasklet_setup(&local->tx_pending_tasklet, ieee80211_tx_pending);
 740
 741         if (ops->wake_tx_queue)
 742                 tasklet_setup(&local->wake_txqs_tasklet, ieee80211_wake_txqs);
 743
 744         tasklet_setup(&local->tasklet, ieee80211_tasklet_handler);
 745
 746         skb_queue_head_init(&local->skb_queue);
 747         skb_queue_head_init(&local->skb_queue_unreliable);
 748         skb_queue_head_init(&local->skb_queue_tdls_chsw);
 749
 750         ieee80211_alloc_led_names(local);
 751
 752         ieee80211_roc_setup(local);
 753
 754         local->hw.radiotap_timestamp.units_pos = -1;
 755         local->hw.radiotap_timestamp.accuracy = -1;
 756
 757         return &local->hw;
 758  err_free:
 759         wiphy_free(wiphy);
 760         return NULL;
 761 }
 762 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
 763
 764 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 765 {
 766         bool have_wep = !fips_enabled; /* FIPS does not permit the use of RC4 */
 767         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
 768         int n_suites = 0, r = 0, w = 0;
 769         u32 *suites;
 770         static const u32 cipher_suites[] = {
 771                 /* keep WEP first, it may be removed below */
 772                 WLAN_CIPHER_SUITE_WEP40,
 773                 WLAN_CIPHER_SUITE_WEP104,
 774                 WLAN_CIPHER_SUITE_TKIP,
 775                 WLAN_CIPHER_SUITE_CCMP,
 776                 WLAN_CIPHER_SUITE_CCMP_256,
 777                 WLAN_CIPHER_SUITE_GCMP,
 778                 WLAN_CIPHER_SUITE_GCMP_256,
 779
 780                 /* keep last -- depends on hw flags! */
 781                 WLAN_CIPHER_SUITE_AES_CMAC,
 782                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
 783                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
 784                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
 785         };
 786
 787         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
 788             local->hw.wiphy->cipher_suites) {
 789                 /* If the driver advertises, or doesn't support SW crypto,
 790                  * we only need to remove WEP if necessary.
 791                  */
 792                 if (have_wep)
 793                         return 0;
 794
 795                 /* well if it has _no_ ciphers ... fine */
 796                 if (!local->hw.wiphy->n_cipher_suites)
 797                         return 0;
 798
 799                 /* Driver provides cipher suites, but we need to exclude WEP */
 800                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 801                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 802                                  GFP_KERNEL);
 803                 if (!suites)
 804                         return -ENOMEM;
 805
 806                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 807                         u32 suite = local->hw.wiphy->cipher_suites[r];
 808
 809                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 810                             suite == WLAN_CIPHER_SUITE_WEP104)
 811                                 continue;
 812                         suites[w++] = suite;
 813                 }
 814         } else if (!local->hw.cipher_schemes) {
 815                 /* If the driver doesn't have cipher schemes, there's nothing
 816                  * else to do other than assign the (software supported and
 817                  * perhaps offloaded) cipher suites.
 818                  */
 819                 local->hw.wiphy->cipher_suites = cipher_suites;
 820                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 821
 822                 if (!have_mfp)
 823                         local->hw.wiphy->n_cipher_suites -= 4;
 824
 825                 if (!have_wep) {
 826                         local->hw.wiphy->cipher_suites += 2;
 827                         local->hw.wiphy->n_cipher_suites -= 2;
 828                 }
 829
 830                 /* not dynamically allocated, so just return */
 831                 return 0;
 832         } else {
 833                 const struct ieee80211_cipher_scheme *cs;
 834
 835                 cs = local->hw.cipher_schemes;
 836
 837                 /* Driver specifies cipher schemes only (but not cipher suites
 838                  * including the schemes)
 839                  *
 840                  * We start counting ciphers defined by schemes, TKIP, CCMP,
 841                  * CCMP-256, GCMP, and GCMP-256
 842                  */
 843                 n_suites = local->hw.n_cipher_schemes + 5;
 844
 845                 /* check if we have WEP40 and WEP104 */
 846                 if (have_wep)
 847                         n_suites += 2;
 848
 849                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
 850                  * BIP-GMAC-256
 851                  */
 852                 if (have_mfp)
 853                         n_suites += 4;
 854
 855                 suites = kmalloc_array(n_suites, sizeof(u32), GFP_KERNEL);
 856                 if (!suites)
 857                         return -ENOMEM;
 858
 859                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 860                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
 861                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 862                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
 863                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
 864
 865                 if (have_wep) {
 866                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 867                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 868                 }
 869
 870                 if (have_mfp) {
 871                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 872                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
 873                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
 874                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
 875                 }
 876
 877                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
 878                         suites[w++] = cs[r].cipher;
 879                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
 880                                 kfree(suites);
 881                                 return -EINVAL;
 882                         }
 883                 }
 884         }
 885
 886         local->hw.wiphy->cipher_suites = suites;
 887         local->hw.wiphy->n_cipher_suites = w;
 888         local->wiphy_ciphers_allocated = true;
 889
 890         return 0;
 891 }
 892
 893 int ieee80211_register_hw(struct ieee80211_hw *hw)
 894 {
 895         struct ieee80211_local *local = hw_to_local(hw);
 896         int result, i;
 897         enum nl80211_band band;
 898         int channels, max_bitrates;
 899         bool supp_ht, supp_vht, supp_he;
 900         struct cfg80211_chan_def dflt_chandef = {};
 901
 902         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
 903             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 904              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 905                 return -EINVAL;
 906
 907         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 908             (!local->ops->tdls_channel_switch ||
 909              !local->ops->tdls_cancel_channel_switch ||
 910              !local->ops->tdls_recv_channel_switch))
 911                 return -EOPNOTSUPP;
 912
 913         if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
 914                     !local->ops->set_frag_threshold))
 915                 return -EINVAL;
 916
 917         if (WARN_ON(local->hw.wiphy->interface_modes &
 918                         BIT(NL80211_IFTYPE_NAN) &&
 919                     (!local->ops->start_nan || !local->ops->stop_nan)))
 920                 return -EINVAL;
 921
 922 #ifdef CONFIG_PM
 923         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 924                 return -EINVAL;
 925 #endif
 926
 927         if (!local->use_chanctx) {
 928                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 929                         const struct ieee80211_iface_combination *comb;
 930
 931                         comb = &local->hw.wiphy->iface_combinations[i];
 932
 933                         if (comb->num_different_channels > 1)
 934                                 return -EINVAL;
 935                 }
 936         } else {
 937                 /* DFS is not supported with multi-channel combinations yet */
 938                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 939                         const struct ieee80211_iface_combination *comb;
 940
 941                         comb = &local->hw.wiphy->iface_combinations[i];
 942
 943                         if (comb->radar_detect_widths &&
 944                             comb->num_different_channels > 1)
 945                                 return -EINVAL;
 946                 }
 947         }
 948
 949         /* Only HW csum features are currently compatible with mac80211 */
 950         if (WARN_ON(hw->netdev_features & ~MAC80211_SUPPORTED_FEATURES))
 951                 return -EINVAL;
 952
 953         if (hw->max_report_rates == 0)
 954                 hw->max_report_rates = hw->max_rates;
 955
 956         local->rx_chains = 1;
 957
 958         /*
 959          * generic code guarantees at least one band,
 960          * set this very early because much code assumes
 961          * that hw.conf.channel is assigned
 962          */
 963         channels = 0;
 964         max_bitrates = 0;
 965         supp_ht = false;
 966         supp_vht = false;
 967         supp_he = false;
 968         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 969                 struct ieee80211_supported_band *sband;
 970
 971                 sband = local->hw.wiphy->bands[band];
 972                 if (!sband)
 973                         continue;
 974
 975                 if (!dflt_chandef.chan) {
 976                         cfg80211_chandef_create(&dflt_chandef,
 977                                                 &sband->channels[0],
 978                                                 NL80211_CHAN_NO_HT);
 979                         /* init channel we're on */
 980                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 981                                 local->hw.conf.chandef = dflt_chandef;
 982                                 local->_oper_chandef = dflt_chandef;
 983                         }
 984                         local->monitor_chandef = dflt_chandef;
 985                 }
 986
 987                 channels += sband->n_channels;
 988
 989                 if (max_bitrates < sband->n_bitrates)
 990                         max_bitrates = sband->n_bitrates;
 991                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 992                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 993
 994                 if (!supp_he)
 995                         supp_he = !!ieee80211_get_he_sta_cap(sband);
 996
 997                 /* HT, VHT, HE require QoS, thus >= 4 queues */
 998                 if (WARN_ON(local->hw.queues < IEEE80211_NUM_ACS &&
 999                             (supp_ht || supp_vht || supp_he)))
1000                         return -EINVAL;
1001
1002                 if (!sband->ht_cap.ht_supported)
1003                         continue;
1004
1005                 /* TODO: consider VHT for RX chains, hopefully it's the same */
1006                 local->rx_chains =
1007                         max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
1008                             local->rx_chains);
1009
1010                 /* no need to mask, SM_PS_DISABLED has all bits set */
1011                 sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
1012                                      IEEE80211_HT_CAP_SM_PS_SHIFT;
1013         }
1014
1015         /* if low-level driver supports AP, we also support VLAN.
1016          * drivers advertising SW_CRYPTO_CONTROL should enable AP_VLAN
1017          * based on their support to transmit SW encrypted packets.
1018          */
1019         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP) &&
1020             !ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL)) {
1021                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
1022                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
1023         }
1024
1025         /* mac80211 always supports monitor */
1026         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
1027         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
1028
1029         /* mac80211 doesn't support more than one IBSS interface right now */
1030         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
1031                 const struct ieee80211_iface_combination *c;
1032                 int j;
1033
1034                 c = &hw->wiphy->iface_combinations[i];
1035
1036                 for (j = 0; j < c->n_limits; j++)
1037                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
1038                             c->limits[j].max > 1)
1039                                 return -EINVAL;
1040         }
1041
1042         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
1043                                       sizeof(void *) * channels, GFP_KERNEL);
1044         if (!local->int_scan_req)
1045                 return -ENOMEM;
1046
1047         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1048                 if (!local->hw.wiphy->bands[band])
1049                         continue;
1050                 local->int_scan_req->rates[band] = (u32) -1;
1051         }
1052
1053 #ifndef CONFIG_MAC80211_MESH
1054         /* mesh depends on Kconfig, but drivers should set it if they want */
1055         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
1056 #endif
1057
1058         /* if the underlying driver supports mesh, mac80211 will (at least)
1059          * provide routing of mesh authentication frames to userspace */
1060         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
1061                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
1062
1063         /* mac80211 supports control port protocol changing */
1064         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
1065
1066         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
1067                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
1068         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
1069                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
1070                 if (hw->max_signal <= 0) {
1071                         result = -EINVAL;
1072                         goto fail_workqueue;
1073                 }
1074         }
1075
1076         /* Mac80211 and therefore all drivers using SW crypto only
1077          * are able to handle PTK rekeys and Extended Key ID.
1078          */
1079         if (!local->ops->set_key) {
1080                 wiphy_ext_feature_set(local->hw.wiphy,
1081                                       NL80211_EXT_FEATURE_CAN_REPLACE_PTK0);
1082                 wiphy_ext_feature_set(local->hw.wiphy,
1083                                       NL80211_EXT_FEATURE_EXT_KEY_ID);
1084         }
1085
1086         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_ADHOC))
1087                 wiphy_ext_feature_set(local->hw.wiphy,
1088                                       NL80211_EXT_FEATURE_DEL_IBSS_STA);
1089
1090         /*
1091          * Calculate scan IE length -- we need this to alloc
1092          * memory and to subtract from the driver limit. It
1093          * includes the DS Params, (extended) supported rates, and HT
1094          * information -- SSID is the driver's responsibility.
1095          */
1096         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
1097                 3 /* DS Params */;
1098         if (supp_ht)
1099                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
1100
1101         if (supp_vht)
1102                 local->scan_ies_len +=
1103                         2 + sizeof(struct ieee80211_vht_cap);
1104
1105         /* HE cap element is variable in size - set len to allow max size */
1106         /*
1107          * TODO: 1 is added at the end of the calculation to accommodate for
1108          *      the temporary placing of the HE capabilities IE under EXT.
1109          *      Remove it once it is placed in the final place.
1110          */
1111         if (supp_he)
1112                 local->scan_ies_len +=
1113                         2 + sizeof(struct ieee80211_he_cap_elem) +
1114                         sizeof(struct ieee80211_he_mcs_nss_supp) +
1115                         IEEE80211_HE_PPE_THRES_MAX_LEN + 1;
1116
1117         if (!local->ops->hw_scan) {
1118                 /* For hw_scan, driver needs to set these up. */
1119                 local->hw.wiphy->max_scan_ssids = 4;
1120                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
1121         }
1122
1123         /*
1124          * If the driver supports any scan IEs, then assume the
1125          * limit includes the IEs mac80211 will add, otherwise
1126          * leave it at zero and let the driver sort it out; we
1127          * still pass our IEs to the driver but userspace will
1128          * not be allowed to in that case.
1129          */
1130         if (local->hw.wiphy->max_scan_ie_len)
1131                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1132
1133         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1134                                          local->hw.n_cipher_schemes));
1135
1136         result = ieee80211_init_cipher_suites(local);
1137         if (result < 0)
1138                 goto fail_workqueue;
1139
1140         if (!local->ops->remain_on_channel)
1141                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1142
1143         /* mac80211 based drivers don't support internal TDLS setup */
1144         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1145                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1146
1147         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1148         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1149                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1150
1151         /* mac80211 supports multi BSSID, if the driver supports it */
1152         if (ieee80211_hw_check(&local->hw, SUPPORTS_MULTI_BSSID)) {
1153                 local->hw.wiphy->support_mbssid = true;
1154                 if (ieee80211_hw_check(&local->hw,
1155                                        SUPPORTS_ONLY_HE_MULTI_BSSID))
1156                         local->hw.wiphy->support_only_he_mbssid = true;
1157                 else
1158                         local->ext_capa[2] |=
1159                                 WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;
1160         }
1161
1162         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
1163
1164         /*
1165          * We use the number of queues for feature tests (QoS, HT) internally
1166          * so restrict them appropriately.
1167          */
1168         if (hw->queues > IEEE80211_MAX_QUEUES)
1169                 hw->queues = IEEE80211_MAX_QUEUES;
1170
1171         local->workqueue =
1172                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1173         if (!local->workqueue) {
1174                 result = -ENOMEM;
1175                 goto fail_workqueue;
1176         }
1177
1178         /*
1179          * The hardware needs headroom for sending the frame,
1180          * and we need some headroom for passing the frame to monitor
1181          * interfaces, but never both at the same time.
1182          */
1183         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1184                                    IEEE80211_TX_STATUS_HEADROOM);
1185
1186         /*
1187          * if the driver doesn't specify a max listen interval we
1188          * use 5 which should be a safe default
1189          */
1190         if (local->hw.max_listen_interval == 0)
1191                 local->hw.max_listen_interval = 5;
1192
1193         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1194
1195         local->dynamic_ps_forced_timeout = -1;
1196
1197         if (!local->hw.max_nan_de_entries)
1198                 local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1199
1200         if (!local->hw.weight_multiplier)
1201                 local->hw.weight_multiplier = 1;
1202
1203         ieee80211_wep_init(local);
1204
1205         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1206
1207         ieee80211_led_init(local);
1208
1209         result = ieee80211_txq_setup_flows(local);
1210         if (result)
1211                 goto fail_flows;
1212
1213         rtnl_lock();
1214         result = ieee80211_init_rate_ctrl_alg(local,
1215                                               hw->rate_control_algorithm);
1216         rtnl_unlock();
1217         if (result < 0) {
1218                 wiphy_debug(local->hw.wiphy,
1219                             "Failed to initialize rate control algorithm\n");
1220                 goto fail_rate;
1221         }
1222
1223         if (local->rate_ctrl) {
1224                 clear_bit(IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW, hw->flags);
1225                 if (local->rate_ctrl->ops->capa & RATE_CTRL_CAPA_VHT_EXT_NSS_BW)
1226                         ieee80211_hw_set(hw, SUPPORTS_VHT_EXT_NSS_BW);
1227         }
1228
1229         /*
1230          * If the VHT capabilities don't have IEEE80211_VHT_EXT_NSS_BW_CAPABLE,
1231          * or have it when we don't, copy the sband structure and set/clear it.
1232          * This is necessary because rate scaling algorithms could be switched
1233          * and have different support values.
1234          * Print a message so that in the common case the reallocation can be
1235          * avoided.
1236          */
1237         BUILD_BUG_ON(NUM_NL80211_BANDS > 8 * sizeof(local->sband_allocated));
1238         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1239                 struct ieee80211_supported_band *sband;
1240                 bool local_cap, ie_cap;
1241
1242                 local_cap = ieee80211_hw_check(hw, SUPPORTS_VHT_EXT_NSS_BW);
1243
1244                 sband = local->hw.wiphy->bands[band];
1245                 if (!sband || !sband->vht_cap.vht_supported)
1246                         continue;
1247
1248                 ie_cap = !!(sband->vht_cap.vht_mcs.tx_highest &
1249                             cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE));
1250
1251                 if (local_cap == ie_cap)
1252                         continue;
1253
1254                 sband = kmemdup(sband, sizeof(*sband), GFP_KERNEL);
1255                 if (!sband) {
1256                         result = -ENOMEM;
1257                         goto fail_rate;
1258                 }
1259
1260                 wiphy_dbg(hw->wiphy, "copying sband (band %d) due to VHT EXT NSS BW flag\n",
1261                           band);
1262
1263                 sband->vht_cap.vht_mcs.tx_highest ^=
1264                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);
1265
1266                 local->hw.wiphy->bands[band] = sband;
1267                 local->sband_allocated |= BIT(band);
1268         }
1269
1270         result = wiphy_register(local->hw.wiphy);
1271         if (result < 0)
1272                 goto fail_wiphy_register;
1273
1274         debugfs_hw_add(local);
1275         rate_control_add_debugfs(local);
1276
1277         rtnl_lock();
1278         wiphy_lock(hw->wiphy);
1279
1280         /* add one default STA interface if supported */
1281         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1282             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1283                 struct vif_params params = {0};
1284
1285                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1286                                           NL80211_IFTYPE_STATION, &params);
1287                 if (result)
1288                         wiphy_warn(local->hw.wiphy,
1289                                    "Failed to add default virtual iface\n");
1290         }
1291
1292         wiphy_unlock(hw->wiphy);
1293         rtnl_unlock();
1294
1295 #ifdef CONFIG_INET
1296         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1297         result = register_inetaddr_notifier(&local->ifa_notifier);
1298         if (result)
1299                 goto fail_ifa;
1300 #endif
1301
1302 #if IS_ENABLED(CONFIG_IPV6)
1303         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1304         result = register_inet6addr_notifier(&local->ifa6_notifier);
1305         if (result)
1306                 goto fail_ifa6;
1307 #endif
1308
1309         return 0;
1310
1311 #if IS_ENABLED(CONFIG_IPV6)
1312  fail_ifa6:
1313 #ifdef CONFIG_INET
1314         unregister_inetaddr_notifier(&local->ifa_notifier);
1315 #endif
1316 #endif
1317 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1318  fail_ifa:
1319 #endif
1320         wiphy_unregister(local->hw.wiphy);
1321  fail_wiphy_register:
1322         rtnl_lock();
1323         rate_control_deinitialize(local);
1324         ieee80211_remove_interfaces(local);
1325         rtnl_unlock();
1326  fail_rate:
1327  fail_flows:
1328         ieee80211_led_exit(local);
1329         destroy_workqueue(local->workqueue);
1330  fail_workqueue:
1331         if (local->wiphy_ciphers_allocated)
1332                 kfree(local->hw.wiphy->cipher_suites);
1333         kfree(local->int_scan_req);
1334         return result;
1335 }
1336 EXPORT_SYMBOL(ieee80211_register_hw);
1337
1338 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1339 {
1340         struct ieee80211_local *local = hw_to_local(hw);
1341
1342         tasklet_kill(&local->tx_pending_tasklet);
1343         tasklet_kill(&local->tasklet);
1344
1345 #ifdef CONFIG_INET
1346         unregister_inetaddr_notifier(&local->ifa_notifier);
1347 #endif
1348 #if IS_ENABLED(CONFIG_IPV6)
1349         unregister_inet6addr_notifier(&local->ifa6_notifier);
1350 #endif
1351
1352         rtnl_lock();
1353
1354         /*
1355          * At this point, interface list manipulations are fine
1356          * because the driver cannot be handing us frames any
1357          * more and the tasklet is killed.
1358          */
1359         ieee80211_remove_interfaces(local);
1360
1361         rtnl_unlock();
1362
1363         cancel_delayed_work_sync(&local->roc_work);
1364         cancel_work_sync(&local->restart_work);
1365         cancel_work_sync(&local->reconfig_filter);
1366         cancel_work_sync(&local->tdls_chsw_work);
1367         flush_work(&local->sched_scan_stopped_work);
1368         flush_work(&local->radar_detected_work);
1369
1370         ieee80211_clear_tx_pending(local);
1371         rate_control_deinitialize(local);
1372
1373         if (skb_queue_len(&local->skb_queue) ||
1374             skb_queue_len(&local->skb_queue_unreliable))
1375                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1376         skb_queue_purge(&local->skb_queue);
1377         skb_queue_purge(&local->skb_queue_unreliable);
1378         skb_queue_purge(&local->skb_queue_tdls_chsw);
1379
1380         wiphy_unregister(local->hw.wiphy);
1381         destroy_workqueue(local->workqueue);
1382         ieee80211_led_exit(local);
1383         kfree(local->int_scan_req);
1384 }
1385 EXPORT_SYMBOL(ieee80211_unregister_hw);
1386
1387 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1388 {
1389         WARN_ONCE(1, "Have pending ack frames!\n");
1390         kfree_skb(p);
1391         return 0;
1392 }
1393
1394 void ieee80211_free_hw(struct ieee80211_hw *hw)
1395 {
1396         struct ieee80211_local *local = hw_to_local(hw);
1397         enum nl80211_band band;
1398
1399         mutex_destroy(&local->iflist_mtx);
1400         mutex_destroy(&local->mtx);
1401
1402         if (local->wiphy_ciphers_allocated)
1403                 kfree(local->hw.wiphy->cipher_suites);
1404
1405         idr_for_each(&local->ack_status_frames,
1406                      ieee80211_free_ack_frame, NULL);
1407         idr_destroy(&local->ack_status_frames);
1408
1409         sta_info_stop(local);
1410
1411         ieee80211_free_led_names(local);
1412
1413         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1414                 if (!(local->sband_allocated & BIT(band)))
1415                         continue;
1416                 kfree(local->hw.wiphy->bands[band]);
1417         }
1418
1419         wiphy_free(local->hw.wiphy);
1420 }
1421 EXPORT_SYMBOL(ieee80211_free_hw);
1422
1423 static int __init ieee80211_init(void)
1424 {
1425         struct sk_buff *skb;
1426         int ret;
1427
1428         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1429         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1430                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1431
1432         ret = rc80211_minstrel_init();
1433         if (ret)
1434                 return ret;
1435
1436         ret = ieee80211_iface_init();
1437         if (ret)
1438                 goto err_netdev;
1439
1440         return 0;
1441  err_netdev:
1442         rc80211_minstrel_exit();
1443
1444         return ret;
1445 }
1446
1447 static void __exit ieee80211_exit(void)
1448 {
1449         rc80211_minstrel_exit();
1450
1451         ieee80211s_stop();
1452
1453         ieee80211_iface_exit();
1454
1455         rcu_barrier();
1456 }
1457
1458
1459 subsys_initcall(ieee80211_init);
1460 module_exit(ieee80211_exit);
1461
1462 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1463 MODULE_LICENSE("GPL");