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) 2018-2021 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         int ret;
 256
 257         /* wait for scan work complete */
 258         flush_workqueue(local->workqueue);
 259         flush_work(&local->sched_scan_stopped_work);
 260         flush_work(&local->radar_detected_work);
 261
 262         rtnl_lock();
 263         /* we might do interface manipulations, so need both */
 264         wiphy_lock(local->hw.wiphy);
 265
 266         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 267              "%s called with hardware scan in progress\n", __func__);
 268
 269         list_for_each_entry(sdata, &local->interfaces, list) {
 270                 /*
 271                  * XXX: there may be more work for other vif types and even
 272                  * for station mode: a good thing would be to run most of
 273                  * the iface type's dependent _stop (ieee80211_mg_stop,
 274                  * ieee80211_ibss_stop) etc...
 275                  * For now, fix only the specific bug that was seen: race
 276                  * between csa_connection_drop_work and us.
 277                  */
 278                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 279                         /*
 280                          * This worker is scheduled from the iface worker that
 281                          * runs on mac80211's workqueue, so we can't be
 282                          * scheduling this worker after the cancel right here.
 283                          * The exception is ieee80211_chswitch_done.
 284                          * Then we can have a race...
 285                          */
 286                         cancel_work_sync(&sdata->u.mgd.csa_connection_drop_work);
 287                         if (sdata->vif.csa_active) {
 288                                 sdata_lock(sdata);
 289                                 ieee80211_sta_connection_lost(sdata,
 290                                                               sdata->u.mgd.associated->bssid,
 291                                                               WLAN_REASON_UNSPECIFIED, false);
 292                                 sdata_unlock(sdata);
 293                         }
 294                 }
 295                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 296         }
 297         ieee80211_scan_cancel(local);
 298
 299         /* make sure any new ROC will consider local->in_reconfig */
 300         flush_delayed_work(&local->roc_work);
 301         flush_work(&local->hw_roc_done);
 302
 303         /* wait for all packet processing to be done */
 304         synchronize_net();
 305
 306         ret = ieee80211_reconfig(local);
 307         wiphy_unlock(local->hw.wiphy);
 308
 309         if (ret)
 310                 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
 311
 312         rtnl_unlock();
 313 }
 314
 315 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 316 {
 317         struct ieee80211_local *local = hw_to_local(hw);
 318
 319         trace_api_restart_hw(local);
 320
 321         wiphy_info(hw->wiphy,
 322                    "Hardware restart was requested\n");
 323
 324         /* use this reason, ieee80211_reconfig will unblock it */
 325         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 326                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 327                                         false);
 328
 329         /*
 330          * Stop all Rx during the reconfig. We don't want state changes
 331          * or driver callbacks while this is in progress.
 332          */
 333         local->in_reconfig = true;
 334         barrier();
 335
 336         queue_work(system_freezable_wq, &local->restart_work);
 337 }
 338 EXPORT_SYMBOL(ieee80211_restart_hw);
 339
 340 #ifdef CONFIG_INET
 341 static int ieee80211_ifa_changed(struct notifier_block *nb,
 342                                  unsigned long data, void *arg)
 343 {
 344         struct in_ifaddr *ifa = arg;
 345         struct ieee80211_local *local =
 346                 container_of(nb, struct ieee80211_local,
 347                              ifa_notifier);
 348         struct net_device *ndev = ifa->ifa_dev->dev;
 349         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 350         struct in_device *idev;
 351         struct ieee80211_sub_if_data *sdata;
 352         struct ieee80211_bss_conf *bss_conf;
 353         struct ieee80211_if_managed *ifmgd;
 354         int c = 0;
 355
 356         /* Make sure it's our interface that got changed */
 357         if (!wdev)
 358                 return NOTIFY_DONE;
 359
 360         if (wdev->wiphy != local->hw.wiphy)
 361                 return NOTIFY_DONE;
 362
 363         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 364         bss_conf = &sdata->vif.bss_conf;
 365
 366         /* ARP filtering is only supported in managed mode */
 367         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 368                 return NOTIFY_DONE;
 369
 370         idev = __in_dev_get_rtnl(sdata->dev);
 371         if (!idev)
 372                 return NOTIFY_DONE;
 373
 374         ifmgd = &sdata->u.mgd;
 375         sdata_lock(sdata);
 376
 377         /* Copy the addresses to the bss_conf list */
 378         ifa = rtnl_dereference(idev->ifa_list);
 379         while (ifa) {
 380                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 381                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 382                 ifa = rtnl_dereference(ifa->ifa_next);
 383                 c++;
 384         }
 385
 386         bss_conf->arp_addr_cnt = c;
 387
 388         /* Configure driver only if associated (which also implies it is up) */
 389         if (ifmgd->associated)
 390                 ieee80211_bss_info_change_notify(sdata,
 391                                                  BSS_CHANGED_ARP_FILTER);
 392
 393         sdata_unlock(sdata);
 394
 395         return NOTIFY_OK;
 396 }
 397 #endif
 398
 399 #if IS_ENABLED(CONFIG_IPV6)
 400 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 401                                   unsigned long data, void *arg)
 402 {
 403         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 404         struct inet6_dev *idev = ifa->idev;
 405         struct net_device *ndev = ifa->idev->dev;
 406         struct ieee80211_local *local =
 407                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 408         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 409         struct ieee80211_sub_if_data *sdata;
 410
 411         /* Make sure it's our interface that got changed */
 412         if (!wdev || wdev->wiphy != local->hw.wiphy)
 413                 return NOTIFY_DONE;
 414
 415         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 416
 417         /*
 418          * For now only support station mode. This is mostly because
 419          * doing AP would have to handle AP_VLAN in some way ...
 420          */
 421         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 422                 return NOTIFY_DONE;
 423
 424         drv_ipv6_addr_change(local, sdata, idev);
 425
 426         return NOTIFY_OK;
 427 }
 428 #endif
 429
 430 /* There isn't a lot of sense in it, but you can transmit anything you like */
 431 static const struct ieee80211_txrx_stypes
 432 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 433         [NL80211_IFTYPE_ADHOC] = {
 434                 .tx = 0xffff,
 435                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 436                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 437                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 438                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 439         },
 440         [NL80211_IFTYPE_STATION] = {
 441                 .tx = 0xffff,
 442                 /*
 443                  * To support Pre Association Security Negotiation (PASN) while
 444                  * already associated to one AP, allow user space to register to
 445                  * Rx authentication frames, so that the user space logic would
 446                  * be able to receive/handle authentication frames from a
 447                  * different AP as part of PASN.
 448                  * It is expected that user space would intelligently register
 449                  * for Rx authentication frames, i.e., only when PASN is used
 450                  * and configure a match filter only for PASN authentication
 451                  * algorithm, as otherwise the MLME functionality of mac80211
 452                  * would be broken.
 453                  */
 454                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 455                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 456                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 457         },
 458         [NL80211_IFTYPE_AP] = {
 459                 .tx = 0xffff,
 460                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 461                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 462                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 463                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 464                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 465                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 466                         BIT(IEEE80211_STYPE_ACTION >> 4),
 467         },
 468         [NL80211_IFTYPE_AP_VLAN] = {
 469                 /* copy AP */
 470                 .tx = 0xffff,
 471                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 472                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 474                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 475                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 476                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 477                         BIT(IEEE80211_STYPE_ACTION >> 4),
 478         },
 479         [NL80211_IFTYPE_P2P_CLIENT] = {
 480                 .tx = 0xffff,
 481                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 482                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 483         },
 484         [NL80211_IFTYPE_P2P_GO] = {
 485                 .tx = 0xffff,
 486                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 487                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 488                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 489                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 490                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 491                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 492                         BIT(IEEE80211_STYPE_ACTION >> 4),
 493         },
 494         [NL80211_IFTYPE_MESH_POINT] = {
 495                 .tx = 0xffff,
 496                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 497                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 498                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 499         },
 500         [NL80211_IFTYPE_P2P_DEVICE] = {
 501                 .tx = 0xffff,
 502                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 504         },
 505 };
 506
 507 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 508         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 509                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 510
 511         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 512                                 IEEE80211_HT_CAP_MAX_AMSDU |
 513                                 IEEE80211_HT_CAP_SGI_20 |
 514                                 IEEE80211_HT_CAP_SGI_40 |
 515                                 IEEE80211_HT_CAP_TX_STBC |
 516                                 IEEE80211_HT_CAP_RX_STBC |
 517                                 IEEE80211_HT_CAP_LDPC_CODING |
 518                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
 519         .mcs = {
 520                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 521                              0xff, 0xff, 0xff, 0xff, 0xff, },
 522         },
 523 };
 524
 525 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 526         .vht_cap_info =
 527                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 528                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 529                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 530                             IEEE80211_VHT_CAP_RXSTBC_MASK |
 531                             IEEE80211_VHT_CAP_TXSTBC |
 532                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 533                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 534                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 535                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 536                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 537         .supp_mcs = {
 538                 .rx_mcs_map = cpu_to_le16(~0),
 539                 .tx_mcs_map = cpu_to_le16(~0),
 540         },
 541 };
 542
 543 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 544                                            const struct ieee80211_ops *ops,
 545                                            const char *requested_name)
 546 {
 547         struct ieee80211_local *local;
 548         int priv_size, i;
 549         struct wiphy *wiphy;
 550         bool use_chanctx;
 551
 552         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 553                     !ops->add_interface || !ops->remove_interface ||
 554                     !ops->configure_filter))
 555                 return NULL;
 556
 557         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 558                 return NULL;
 559
 560         /* check all or no channel context operations exist */
 561         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 562             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 563             !!ops->unassign_vif_chanctx;
 564         if (WARN_ON(i != 0 && i != 5))
 565                 return NULL;
 566         use_chanctx = i == 5;
 567
 568         /* Ensure 32-byte alignment of our private data and hw private data.
 569          * We use the wiphy priv data for both our ieee80211_local and for
 570          * the driver's private data
 571          *
 572          * In memory it'll be like this:
 573          *
 574          * +-------------------------+
 575          * | struct wiphy           |
 576          * +-------------------------+
 577          * | struct ieee80211_local  |
 578          * +-------------------------+
 579          * | driver's private data   |
 580          * +-------------------------+
 581          *
 582          */
 583         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 584
 585         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
 586
 587         if (!wiphy)
 588                 return NULL;
 589
 590         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 591
 592         wiphy->privid = mac80211_wiphy_privid;
 593
 594         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 595                         WIPHY_FLAG_4ADDR_AP |
 596                         WIPHY_FLAG_4ADDR_STATION |
 597                         WIPHY_FLAG_REPORTS_OBSS |
 598                         WIPHY_FLAG_OFFCHAN_TX;
 599
 600         if (!use_chanctx || ops->remain_on_channel)
 601                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 602
 603         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 604                            NL80211_FEATURE_SAE |
 605                            NL80211_FEATURE_HT_IBSS |
 606                            NL80211_FEATURE_VIF_TXPOWER |
 607                            NL80211_FEATURE_MAC_ON_CREATE |
 608                            NL80211_FEATURE_USERSPACE_MPM |
 609                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 610         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
 611         wiphy_ext_feature_set(wiphy,
 612                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);
 613         wiphy_ext_feature_set(wiphy,
 614                               NL80211_EXT_FEATURE_CONTROL_PORT_NO_PREAUTH);
 615         wiphy_ext_feature_set(wiphy,
 616                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_TX_STATUS);
 617         wiphy_ext_feature_set(wiphy,
 618                               NL80211_EXT_FEATURE_SCAN_FREQ_KHZ);
 619
 620         if (!ops->hw_scan) {
 621                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 622                                    NL80211_FEATURE_AP_SCAN;
 623                 /*
 624                  * if the driver behaves correctly using the probe request
 625                  * (template) from mac80211, then both of these should be
 626                  * supported even with hw scan - but let drivers opt in.
 627                  */
 628                 wiphy_ext_feature_set(wiphy,
 629                                       NL80211_EXT_FEATURE_SCAN_RANDOM_SN);
 630                 wiphy_ext_feature_set(wiphy,
 631                                       NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT);
 632         }
 633
 634         if (!ops->set_key)
 635                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 636
 637         if (ops->wake_tx_queue)
 638                 wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_TXQS);
 639
 640         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
 641
 642         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 643
 644         local = wiphy_priv(wiphy);
 645
 646         if (sta_info_init(local))
 647                 goto err_free;
 648
 649         local->hw.wiphy = wiphy;
 650
 651         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 652
 653         local->ops = ops;
 654         local->use_chanctx = use_chanctx;
 655
 656         /*
 657          * We need a bit of data queued to build aggregates properly, so
 658          * instruct the TCP stack to allow more than a single ms of data
 659          * to be queued in the stack. The value is a bit-shift of 1
 660          * second, so 7 is ~8ms of queued data. Only affects local TCP
 661          * sockets.
 662          * This is the default, anyhow - drivers may need to override it
 663          * for local reasons (longer buffers, longer completion time, or
 664          * similar).
 665          */
 666         local->hw.tx_sk_pacing_shift = 7;
 667
 668         /* set up some defaults */
 669         local->hw.queues = 1;
 670         local->hw.max_rates = 1;
 671         local->hw.max_report_rates = 0;
 672         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
 673         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
 674         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 675         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 676         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 677         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 678                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 679                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 680         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 681                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 682         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 683         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 684         local->hw.max_mtu = IEEE80211_MAX_DATA_LEN;
 685         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 686         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 687         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 688
 689         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
 690
 691         wiphy->extended_capabilities = local->ext_capa;
 692         wiphy->extended_capabilities_mask = local->ext_capa;
 693         wiphy->extended_capabilities_len =
 694                 ARRAY_SIZE(local->ext_capa);
 695
 696         INIT_LIST_HEAD(&local->interfaces);
 697         INIT_LIST_HEAD(&local->mon_list);
 698
 699         __hw_addr_init(&local->mc_list);
 700
 701         mutex_init(&local->iflist_mtx);
 702         mutex_init(&local->mtx);
 703
 704         mutex_init(&local->key_mtx);
 705         spin_lock_init(&local->filter_lock);
 706         spin_lock_init(&local->rx_path_lock);
 707         spin_lock_init(&local->queue_stop_reason_lock);
 708
 709         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 710                 struct airtime_sched_info *air_sched = &local->airtime[i];
 711
 712                 air_sched->active_txqs = RB_ROOT_CACHED;
 713                 INIT_LIST_HEAD(&air_sched->active_list);
 714                 spin_lock_init(&air_sched->lock);
 715                 air_sched->aql_txq_limit_low = IEEE80211_DEFAULT_AQL_TXQ_LIMIT_L;
 716                 air_sched->aql_txq_limit_high =
 717                         IEEE80211_DEFAULT_AQL_TXQ_LIMIT_H;
 718         }
 719
 720         local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX;
 721         local->aql_threshold = IEEE80211_AQL_THRESHOLD;
 722         atomic_set(&local->aql_total_pending_airtime, 0);
 723
 724         INIT_LIST_HEAD(&local->chanctx_list);
 725         mutex_init(&local->chanctx_mtx);
 726
 727         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 728
 729         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 730
 731         INIT_WORK(&local->radar_detected_work,
 732                   ieee80211_dfs_radar_detected_work);
 733
 734         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 735         local->smps_mode = IEEE80211_SMPS_OFF;
 736
 737         INIT_WORK(&local->dynamic_ps_enable_work,
 738                   ieee80211_dynamic_ps_enable_work);
 739         INIT_WORK(&local->dynamic_ps_disable_work,
 740                   ieee80211_dynamic_ps_disable_work);
 741         timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0);
 742
 743         INIT_WORK(&local->sched_scan_stopped_work,
 744                   ieee80211_sched_scan_stopped_work);
 745
 746         spin_lock_init(&local->ack_status_lock);
 747         idr_init(&local->ack_status_frames);
 748
 749         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 750                 skb_queue_head_init(&local->pending[i]);
 751                 atomic_set(&local->agg_queue_stop[i], 0);
 752         }
 753         tasklet_setup(&local->tx_pending_tasklet, ieee80211_tx_pending);
 754
 755         if (ops->wake_tx_queue)
 756                 tasklet_setup(&local->wake_txqs_tasklet, ieee80211_wake_txqs);
 757
 758         tasklet_setup(&local->tasklet, ieee80211_tasklet_handler);
 759
 760         skb_queue_head_init(&local->skb_queue);
 761         skb_queue_head_init(&local->skb_queue_unreliable);
 762
 763         ieee80211_alloc_led_names(local);
 764
 765         ieee80211_roc_setup(local);
 766
 767         local->hw.radiotap_timestamp.units_pos = -1;
 768         local->hw.radiotap_timestamp.accuracy = -1;
 769
 770         return &local->hw;
 771  err_free:
 772         wiphy_free(wiphy);
 773         return NULL;
 774 }
 775 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
 776
 777 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 778 {
 779         bool have_wep = !fips_enabled; /* FIPS does not permit the use of RC4 */
 780         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
 781         int n_suites = 0, r = 0, w = 0;
 782         u32 *suites;
 783         static const u32 cipher_suites[] = {
 784                 /* keep WEP first, it may be removed below */
 785                 WLAN_CIPHER_SUITE_WEP40,
 786                 WLAN_CIPHER_SUITE_WEP104,
 787                 WLAN_CIPHER_SUITE_TKIP,
 788                 WLAN_CIPHER_SUITE_CCMP,
 789                 WLAN_CIPHER_SUITE_CCMP_256,
 790                 WLAN_CIPHER_SUITE_GCMP,
 791                 WLAN_CIPHER_SUITE_GCMP_256,
 792
 793                 /* keep last -- depends on hw flags! */
 794                 WLAN_CIPHER_SUITE_AES_CMAC,
 795                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
 796                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
 797                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
 798         };
 799
 800         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
 801             local->hw.wiphy->cipher_suites) {
 802                 /* If the driver advertises, or doesn't support SW crypto,
 803                  * we only need to remove WEP if necessary.
 804                  */
 805                 if (have_wep)
 806                         return 0;
 807
 808                 /* well if it has _no_ ciphers ... fine */
 809                 if (!local->hw.wiphy->n_cipher_suites)
 810                         return 0;
 811
 812                 /* Driver provides cipher suites, but we need to exclude WEP */
 813                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 814                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 815                                  GFP_KERNEL);
 816                 if (!suites)
 817                         return -ENOMEM;
 818
 819                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 820                         u32 suite = local->hw.wiphy->cipher_suites[r];
 821
 822                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 823                             suite == WLAN_CIPHER_SUITE_WEP104)
 824                                 continue;
 825                         suites[w++] = suite;
 826                 }
 827         } else if (!local->hw.cipher_schemes) {
 828                 /* If the driver doesn't have cipher schemes, there's nothing
 829                  * else to do other than assign the (software supported and
 830                  * perhaps offloaded) cipher suites.
 831                  */
 832                 local->hw.wiphy->cipher_suites = cipher_suites;
 833                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 834
 835                 if (!have_mfp)
 836                         local->hw.wiphy->n_cipher_suites -= 4;
 837
 838                 if (!have_wep) {
 839                         local->hw.wiphy->cipher_suites += 2;
 840                         local->hw.wiphy->n_cipher_suites -= 2;
 841                 }
 842
 843                 /* not dynamically allocated, so just return */
 844                 return 0;
 845         } else {
 846                 const struct ieee80211_cipher_scheme *cs;
 847
 848                 cs = local->hw.cipher_schemes;
 849
 850                 /* Driver specifies cipher schemes only (but not cipher suites
 851                  * including the schemes)
 852                  *
 853                  * We start counting ciphers defined by schemes, TKIP, CCMP,
 854                  * CCMP-256, GCMP, and GCMP-256
 855                  */
 856                 n_suites = local->hw.n_cipher_schemes + 5;
 857
 858                 /* check if we have WEP40 and WEP104 */
 859                 if (have_wep)
 860                         n_suites += 2;
 861
 862                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
 863                  * BIP-GMAC-256
 864                  */
 865                 if (have_mfp)
 866                         n_suites += 4;
 867
 868                 suites = kmalloc_array(n_suites, sizeof(u32), GFP_KERNEL);
 869                 if (!suites)
 870                         return -ENOMEM;
 871
 872                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 873                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
 874                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 875                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
 876                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
 877
 878                 if (have_wep) {
 879                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 880                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 881                 }
 882
 883                 if (have_mfp) {
 884                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 885                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
 886                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
 887                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
 888                 }
 889
 890                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
 891                         suites[w++] = cs[r].cipher;
 892                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
 893                                 kfree(suites);
 894                                 return -EINVAL;
 895                         }
 896                 }
 897         }
 898
 899         local->hw.wiphy->cipher_suites = suites;
 900         local->hw.wiphy->n_cipher_suites = w;
 901         local->wiphy_ciphers_allocated = true;
 902
 903         return 0;
 904 }
 905
 906 int ieee80211_register_hw(struct ieee80211_hw *hw)
 907 {
 908         struct ieee80211_local *local = hw_to_local(hw);
 909         int result, i;
 910         enum nl80211_band band;
 911         int channels, max_bitrates;
 912         bool supp_ht, supp_vht, supp_he;
 913         struct cfg80211_chan_def dflt_chandef = {};
 914
 915         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
 916             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 917              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 918                 return -EINVAL;
 919
 920         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 921             (!local->ops->tdls_channel_switch ||
 922              !local->ops->tdls_cancel_channel_switch ||
 923              !local->ops->tdls_recv_channel_switch))
 924                 return -EOPNOTSUPP;
 925
 926         if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
 927                     !local->ops->set_frag_threshold))
 928                 return -EINVAL;
 929
 930         if (WARN_ON(local->hw.wiphy->interface_modes &
 931                         BIT(NL80211_IFTYPE_NAN) &&
 932                     (!local->ops->start_nan || !local->ops->stop_nan)))
 933                 return -EINVAL;
 934
 935 #ifdef CONFIG_PM
 936         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 937                 return -EINVAL;
 938 #endif
 939
 940         if (!local->use_chanctx) {
 941                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 942                         const struct ieee80211_iface_combination *comb;
 943
 944                         comb = &local->hw.wiphy->iface_combinations[i];
 945
 946                         if (comb->num_different_channels > 1)
 947                                 return -EINVAL;
 948                 }
 949         } else {
 950                 /* DFS is not supported with multi-channel combinations yet */
 951                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 952                         const struct ieee80211_iface_combination *comb;
 953
 954                         comb = &local->hw.wiphy->iface_combinations[i];
 955
 956                         if (comb->radar_detect_widths &&
 957                             comb->num_different_channels > 1)
 958                                 return -EINVAL;
 959                 }
 960         }
 961
 962         /* Only HW csum features are currently compatible with mac80211 */
 963         if (WARN_ON(hw->netdev_features & ~MAC80211_SUPPORTED_FEATURES))
 964                 return -EINVAL;
 965
 966         if (hw->max_report_rates == 0)
 967                 hw->max_report_rates = hw->max_rates;
 968
 969         local->rx_chains = 1;
 970
 971         /*
 972          * generic code guarantees at least one band,
 973          * set this very early because much code assumes
 974          * that hw.conf.channel is assigned
 975          */
 976         channels = 0;
 977         max_bitrates = 0;
 978         supp_ht = false;
 979         supp_vht = false;
 980         supp_he = false;
 981         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 982                 struct ieee80211_supported_band *sband;
 983
 984                 sband = local->hw.wiphy->bands[band];
 985                 if (!sband)
 986                         continue;
 987
 988                 if (!dflt_chandef.chan) {
 989                         /*
 990                          * Assign the first enabled channel to dflt_chandef
 991                          * from the list of channels
 992                          */
 993                         for (i = 0; i < sband->n_channels; i++)
 994                                 if (!(sband->channels[i].flags &
 995                                                 IEEE80211_CHAN_DISABLED))
 996                                         break;
 997                         /* if none found then use the first anyway */
 998                         if (i == sband->n_channels)
 999                                 i = 0;
1000                         cfg80211_chandef_create(&dflt_chandef,
1001                                                 &sband->channels[i],
1002                                                 NL80211_CHAN_NO_HT);
1003                         /* init channel we're on */
1004                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
1005                                 local->hw.conf.chandef = dflt_chandef;
1006                                 local->_oper_chandef = dflt_chandef;
1007                         }
1008                         local->monitor_chandef = dflt_chandef;
1009                 }
1010
1011                 channels += sband->n_channels;
1012
1013                 if (max_bitrates < sband->n_bitrates)
1014                         max_bitrates = sband->n_bitrates;
1015                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
1016                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1017
1018                 for (i = 0; i < sband->n_iftype_data; i++) {
1019                         const struct ieee80211_sband_iftype_data *iftd;
1020
1021                         iftd = &sband->iftype_data[i];
1022
1023                         supp_he = supp_he || (iftd && iftd->he_cap.has_he);
1024                 }
1025
1026                 /* HT, VHT, HE require QoS, thus >= 4 queues */
1027                 if (WARN_ON(local->hw.queues < IEEE80211_NUM_ACS &&
1028                             (supp_ht || supp_vht || supp_he)))
1029                         return -EINVAL;
1030
1031                 if (!sband->ht_cap.ht_supported)
1032                         continue;
1033
1034                 /* TODO: consider VHT for RX chains, hopefully it's the same */
1035                 local->rx_chains =
1036                         max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
1037                             local->rx_chains);
1038
1039                 /* no need to mask, SM_PS_DISABLED has all bits set */
1040                 sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
1041                                      IEEE80211_HT_CAP_SM_PS_SHIFT;
1042         }
1043
1044         /* if low-level driver supports AP, we also support VLAN.
1045          * drivers advertising SW_CRYPTO_CONTROL should enable AP_VLAN
1046          * based on their support to transmit SW encrypted packets.
1047          */
1048         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP) &&
1049             !ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL)) {
1050                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
1051                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
1052         }
1053
1054         /* mac80211 always supports monitor */
1055         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
1056         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
1057
1058         /* mac80211 doesn't support more than one IBSS interface right now */
1059         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
1060                 const struct ieee80211_iface_combination *c;
1061                 int j;
1062
1063                 c = &hw->wiphy->iface_combinations[i];
1064
1065                 for (j = 0; j < c->n_limits; j++)
1066                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
1067                             c->limits[j].max > 1)
1068                                 return -EINVAL;
1069         }
1070
1071         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
1072                                       sizeof(void *) * channels, GFP_KERNEL);
1073         if (!local->int_scan_req)
1074                 return -ENOMEM;
1075
1076         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1077                 if (!local->hw.wiphy->bands[band])
1078                         continue;
1079                 local->int_scan_req->rates[band] = (u32) -1;
1080         }
1081
1082 #ifndef CONFIG_MAC80211_MESH
1083         /* mesh depends on Kconfig, but drivers should set it if they want */
1084         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
1085 #endif
1086
1087         /* if the underlying driver supports mesh, mac80211 will (at least)
1088          * provide routing of mesh authentication frames to userspace */
1089         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
1090                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
1091
1092         /* mac80211 supports control port protocol changing */
1093         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
1094
1095         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
1096                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
1097         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
1098                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
1099                 if (hw->max_signal <= 0) {
1100                         result = -EINVAL;
1101                         goto fail_workqueue;
1102                 }
1103         }
1104
1105         /* Mac80211 and therefore all drivers using SW crypto only
1106          * are able to handle PTK rekeys and Extended Key ID.
1107          */
1108         if (!local->ops->set_key) {
1109                 wiphy_ext_feature_set(local->hw.wiphy,
1110                                       NL80211_EXT_FEATURE_CAN_REPLACE_PTK0);
1111                 wiphy_ext_feature_set(local->hw.wiphy,
1112                                       NL80211_EXT_FEATURE_EXT_KEY_ID);
1113         }
1114
1115         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_ADHOC))
1116                 wiphy_ext_feature_set(local->hw.wiphy,
1117                                       NL80211_EXT_FEATURE_DEL_IBSS_STA);
1118
1119         /*
1120          * Calculate scan IE length -- we need this to alloc
1121          * memory and to subtract from the driver limit. It
1122          * includes the DS Params, (extended) supported rates, and HT
1123          * information -- SSID is the driver's responsibility.
1124          */
1125         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
1126                 3 /* DS Params */;
1127         if (supp_ht)
1128                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
1129
1130         if (supp_vht)
1131                 local->scan_ies_len +=
1132                         2 + sizeof(struct ieee80211_vht_cap);
1133
1134         /* HE cap element is variable in size - set len to allow max size */
1135         /*
1136          * TODO: 1 is added at the end of the calculation to accommodate for
1137          *      the temporary placing of the HE capabilities IE under EXT.
1138          *      Remove it once it is placed in the final place.
1139          */
1140         if (supp_he)
1141                 local->scan_ies_len +=
1142                         2 + sizeof(struct ieee80211_he_cap_elem) +
1143                         sizeof(struct ieee80211_he_mcs_nss_supp) +
1144                         IEEE80211_HE_PPE_THRES_MAX_LEN + 1;
1145
1146         if (!local->ops->hw_scan) {
1147                 /* For hw_scan, driver needs to set these up. */
1148                 local->hw.wiphy->max_scan_ssids = 4;
1149                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
1150         }
1151
1152         /*
1153          * If the driver supports any scan IEs, then assume the
1154          * limit includes the IEs mac80211 will add, otherwise
1155          * leave it at zero and let the driver sort it out; we
1156          * still pass our IEs to the driver but userspace will
1157          * not be allowed to in that case.
1158          */
1159         if (local->hw.wiphy->max_scan_ie_len)
1160                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1161
1162         if (WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1163                                              local->hw.n_cipher_schemes))) {
1164                 result = -EINVAL;
1165                 goto fail_workqueue;
1166         }
1167
1168         result = ieee80211_init_cipher_suites(local);
1169         if (result < 0)
1170                 goto fail_workqueue;
1171
1172         if (!local->ops->remain_on_channel)
1173                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1174
1175         /* mac80211 based drivers don't support internal TDLS setup */
1176         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1177                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1178
1179         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1180         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1181                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1182
1183         /* mac80211 supports multi BSSID, if the driver supports it */
1184         if (ieee80211_hw_check(&local->hw, SUPPORTS_MULTI_BSSID)) {
1185                 local->hw.wiphy->support_mbssid = true;
1186                 if (ieee80211_hw_check(&local->hw,
1187                                        SUPPORTS_ONLY_HE_MULTI_BSSID))
1188                         local->hw.wiphy->support_only_he_mbssid = true;
1189                 else
1190                         local->ext_capa[2] |=
1191                                 WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;
1192         }
1193
1194         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
1195
1196         /*
1197          * We use the number of queues for feature tests (QoS, HT) internally
1198          * so restrict them appropriately.
1199          */
1200         if (hw->queues > IEEE80211_MAX_QUEUES)
1201                 hw->queues = IEEE80211_MAX_QUEUES;
1202
1203         local->workqueue =
1204                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1205         if (!local->workqueue) {
1206                 result = -ENOMEM;
1207                 goto fail_workqueue;
1208         }
1209
1210         /*
1211          * The hardware needs headroom for sending the frame,
1212          * and we need some headroom for passing the frame to monitor
1213          * interfaces, but never both at the same time.
1214          */
1215         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1216                                    IEEE80211_TX_STATUS_HEADROOM);
1217
1218         /*
1219          * if the driver doesn't specify a max listen interval we
1220          * use 5 which should be a safe default
1221          */
1222         if (local->hw.max_listen_interval == 0)
1223                 local->hw.max_listen_interval = 5;
1224
1225         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1226
1227         local->dynamic_ps_forced_timeout = -1;
1228
1229         if (!local->hw.max_nan_de_entries)
1230                 local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1231
1232         if (!local->hw.weight_multiplier)
1233                 local->hw.weight_multiplier = 1;
1234
1235         ieee80211_wep_init(local);
1236
1237         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1238
1239         ieee80211_led_init(local);
1240
1241         result = ieee80211_txq_setup_flows(local);
1242         if (result)
1243                 goto fail_flows;
1244
1245         rtnl_lock();
1246         result = ieee80211_init_rate_ctrl_alg(local,
1247                                               hw->rate_control_algorithm);
1248         rtnl_unlock();
1249         if (result < 0) {
1250                 wiphy_debug(local->hw.wiphy,
1251                             "Failed to initialize rate control algorithm\n");
1252                 goto fail_rate;
1253         }
1254
1255         if (local->rate_ctrl) {
1256                 clear_bit(IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW, hw->flags);
1257                 if (local->rate_ctrl->ops->capa & RATE_CTRL_CAPA_VHT_EXT_NSS_BW)
1258                         ieee80211_hw_set(hw, SUPPORTS_VHT_EXT_NSS_BW);
1259         }
1260
1261         /*
1262          * If the VHT capabilities don't have IEEE80211_VHT_EXT_NSS_BW_CAPABLE,
1263          * or have it when we don't, copy the sband structure and set/clear it.
1264          * This is necessary because rate scaling algorithms could be switched
1265          * and have different support values.
1266          * Print a message so that in the common case the reallocation can be
1267          * avoided.
1268          */
1269         BUILD_BUG_ON(NUM_NL80211_BANDS > 8 * sizeof(local->sband_allocated));
1270         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1271                 struct ieee80211_supported_band *sband;
1272                 bool local_cap, ie_cap;
1273
1274                 local_cap = ieee80211_hw_check(hw, SUPPORTS_VHT_EXT_NSS_BW);
1275
1276                 sband = local->hw.wiphy->bands[band];
1277                 if (!sband || !sband->vht_cap.vht_supported)
1278                         continue;
1279
1280                 ie_cap = !!(sband->vht_cap.vht_mcs.tx_highest &
1281                             cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE));
1282
1283                 if (local_cap == ie_cap)
1284                         continue;
1285
1286                 sband = kmemdup(sband, sizeof(*sband), GFP_KERNEL);
1287                 if (!sband) {
1288                         result = -ENOMEM;
1289                         goto fail_rate;
1290                 }
1291
1292                 wiphy_dbg(hw->wiphy, "copying sband (band %d) due to VHT EXT NSS BW flag\n",
1293                           band);
1294
1295                 sband->vht_cap.vht_mcs.tx_highest ^=
1296                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);
1297
1298                 local->hw.wiphy->bands[band] = sband;
1299                 local->sband_allocated |= BIT(band);
1300         }
1301
1302         result = wiphy_register(local->hw.wiphy);
1303         if (result < 0)
1304                 goto fail_wiphy_register;
1305
1306         debugfs_hw_add(local);
1307         rate_control_add_debugfs(local);
1308
1309         rtnl_lock();
1310         wiphy_lock(hw->wiphy);
1311
1312         /* add one default STA interface if supported */
1313         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1314             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1315                 struct vif_params params = {0};
1316
1317                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1318                                           NL80211_IFTYPE_STATION, &params);
1319                 if (result)
1320                         wiphy_warn(local->hw.wiphy,
1321                                    "Failed to add default virtual iface\n");
1322         }
1323
1324         wiphy_unlock(hw->wiphy);
1325         rtnl_unlock();
1326
1327 #ifdef CONFIG_INET
1328         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1329         result = register_inetaddr_notifier(&local->ifa_notifier);
1330         if (result)
1331                 goto fail_ifa;
1332 #endif
1333
1334 #if IS_ENABLED(CONFIG_IPV6)
1335         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1336         result = register_inet6addr_notifier(&local->ifa6_notifier);
1337         if (result)
1338                 goto fail_ifa6;
1339 #endif
1340
1341         return 0;
1342
1343 #if IS_ENABLED(CONFIG_IPV6)
1344  fail_ifa6:
1345 #ifdef CONFIG_INET
1346         unregister_inetaddr_notifier(&local->ifa_notifier);
1347 #endif
1348 #endif
1349 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1350  fail_ifa:
1351 #endif
1352         wiphy_unregister(local->hw.wiphy);
1353  fail_wiphy_register:
1354         rtnl_lock();
1355         rate_control_deinitialize(local);
1356         ieee80211_remove_interfaces(local);
1357         rtnl_unlock();
1358  fail_rate:
1359  fail_flows:
1360         ieee80211_led_exit(local);
1361         destroy_workqueue(local->workqueue);
1362  fail_workqueue:
1363         if (local->wiphy_ciphers_allocated)
1364                 kfree(local->hw.wiphy->cipher_suites);
1365         kfree(local->int_scan_req);
1366         return result;
1367 }
1368 EXPORT_SYMBOL(ieee80211_register_hw);
1369
1370 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1371 {
1372         struct ieee80211_local *local = hw_to_local(hw);
1373
1374         tasklet_kill(&local->tx_pending_tasklet);
1375         tasklet_kill(&local->tasklet);
1376
1377 #ifdef CONFIG_INET
1378         unregister_inetaddr_notifier(&local->ifa_notifier);
1379 #endif
1380 #if IS_ENABLED(CONFIG_IPV6)
1381         unregister_inet6addr_notifier(&local->ifa6_notifier);
1382 #endif
1383
1384         rtnl_lock();
1385
1386         /*
1387          * At this point, interface list manipulations are fine
1388          * because the driver cannot be handing us frames any
1389          * more and the tasklet is killed.
1390          */
1391         ieee80211_remove_interfaces(local);
1392
1393         rtnl_unlock();
1394
1395         cancel_delayed_work_sync(&local->roc_work);
1396         cancel_work_sync(&local->restart_work);
1397         cancel_work_sync(&local->reconfig_filter);
1398         flush_work(&local->sched_scan_stopped_work);
1399         flush_work(&local->radar_detected_work);
1400
1401         ieee80211_clear_tx_pending(local);
1402         rate_control_deinitialize(local);
1403
1404         if (skb_queue_len(&local->skb_queue) ||
1405             skb_queue_len(&local->skb_queue_unreliable))
1406                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1407         skb_queue_purge(&local->skb_queue);
1408         skb_queue_purge(&local->skb_queue_unreliable);
1409
1410         wiphy_unregister(local->hw.wiphy);
1411         destroy_workqueue(local->workqueue);
1412         ieee80211_led_exit(local);
1413         kfree(local->int_scan_req);
1414 }
1415 EXPORT_SYMBOL(ieee80211_unregister_hw);
1416
1417 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1418 {
1419         WARN_ONCE(1, "Have pending ack frames!\n");
1420         kfree_skb(p);
1421         return 0;
1422 }
1423
1424 void ieee80211_free_hw(struct ieee80211_hw *hw)
1425 {
1426         struct ieee80211_local *local = hw_to_local(hw);
1427         enum nl80211_band band;
1428
1429         mutex_destroy(&local->iflist_mtx);
1430         mutex_destroy(&local->mtx);
1431
1432         if (local->wiphy_ciphers_allocated)
1433                 kfree(local->hw.wiphy->cipher_suites);
1434
1435         idr_for_each(&local->ack_status_frames,
1436                      ieee80211_free_ack_frame, NULL);
1437         idr_destroy(&local->ack_status_frames);
1438
1439         sta_info_stop(local);
1440
1441         ieee80211_free_led_names(local);
1442
1443         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1444                 if (!(local->sband_allocated & BIT(band)))
1445                         continue;
1446                 kfree(local->hw.wiphy->bands[band]);
1447         }
1448
1449         wiphy_free(local->hw.wiphy);
1450 }
1451 EXPORT_SYMBOL(ieee80211_free_hw);
1452
1453 static int __init ieee80211_init(void)
1454 {
1455         struct sk_buff *skb;
1456         int ret;
1457
1458         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1459         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1460                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1461
1462         ret = rc80211_minstrel_init();
1463         if (ret)
1464                 return ret;
1465
1466         ret = ieee80211_iface_init();
1467         if (ret)
1468                 goto err_netdev;
1469
1470         return 0;
1471  err_netdev:
1472         rc80211_minstrel_exit();
1473
1474         return ret;
1475 }
1476
1477 static void __exit ieee80211_exit(void)
1478 {
1479         rc80211_minstrel_exit();
1480
1481         ieee80211s_stop();
1482
1483         ieee80211_iface_exit();
1484
1485         rcu_barrier();
1486 }
1487
1488
1489 subsys_initcall(ieee80211_init);
1490 module_exit(ieee80211_exit);
1491
1492 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1493 MODULE_LICENSE("GPL");