net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  * Copyright (C) 2017     Intel Deutschland GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <net/mac80211.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/inetdevice.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27 #include <net/addrconf.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "mesh.h"
  33 #include "wep.h"
  34 #include "led.h"
  35 #include "debugfs.h"
  36
  37 void ieee80211_configure_filter(struct ieee80211_local *local)
  38 {
  39         u64 mc;
  40         unsigned int changed_flags;
  41         unsigned int new_flags = 0;
  42
  43         if (atomic_read(&local->iff_allmultis))
  44                 new_flags |= FIF_ALLMULTI;
  45
  46         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  47             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  48                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  49
  50         if (local->fif_probe_req || local->probe_req_reg)
  51                 new_flags |= FIF_PROBE_REQ;
  52
  53         if (local->fif_fcsfail)
  54                 new_flags |= FIF_FCSFAIL;
  55
  56         if (local->fif_plcpfail)
  57                 new_flags |= FIF_PLCPFAIL;
  58
  59         if (local->fif_control)
  60                 new_flags |= FIF_CONTROL;
  61
  62         if (local->fif_other_bss)
  63                 new_flags |= FIF_OTHER_BSS;
  64
  65         if (local->fif_pspoll)
  66                 new_flags |= FIF_PSPOLL;
  67
  68         spin_lock_bh(&local->filter_lock);
  69         changed_flags = local->filter_flags ^ new_flags;
  70
  71         mc = drv_prepare_multicast(local, &local->mc_list);
  72         spin_unlock_bh(&local->filter_lock);
  73
  74         /* be a bit nasty */
  75         new_flags |= (1<<31);
  76
  77         drv_configure_filter(local, changed_flags, &new_flags, mc);
  78
  79         WARN_ON(new_flags & (1<<31));
  80
  81         local->filter_flags = new_flags & ~(1<<31);
  82 }
  83
  84 static void ieee80211_reconfig_filter(struct work_struct *work)
  85 {
  86         struct ieee80211_local *local =
  87                 container_of(work, struct ieee80211_local, reconfig_filter);
  88
  89         ieee80211_configure_filter(local);
  90 }
  91
  92 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  93 {
  94         struct ieee80211_sub_if_data *sdata;
  95         struct cfg80211_chan_def chandef = {};
  96         u32 changed = 0;
  97         int power;
  98         u32 offchannel_flag;
  99
 100         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 101
 102         if (local->scan_chandef.chan) {
 103                 chandef = local->scan_chandef;
 104         } else if (local->tmp_channel) {
 105                 chandef.chan = local->tmp_channel;
 106                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 107                 chandef.center_freq1 = chandef.chan->center_freq;
 108         } else
 109                 chandef = local->_oper_chandef;
 110
 111         WARN(!cfg80211_chandef_valid(&chandef),
 112              "control:%d MHz width:%d center: %d/%d MHz",
 113              chandef.chan->center_freq, chandef.width,
 114              chandef.center_freq1, chandef.center_freq2);
 115
 116         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
 117                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 118         else
 119                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 120
 121         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 122
 123         if (offchannel_flag ||
 124             !cfg80211_chandef_identical(&local->hw.conf.chandef,
 125                                         &local->_oper_chandef)) {
 126                 local->hw.conf.chandef = chandef;
 127                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 128         }
 129
 130         if (!conf_is_ht(&local->hw.conf)) {
 131                 /*
 132                  * mac80211.h documents that this is only valid
 133                  * when the channel is set to an HT type, and
 134                  * that otherwise STATIC is used.
 135                  */
 136                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 137         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 138                 local->hw.conf.smps_mode = local->smps_mode;
 139                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 140         }
 141
 142         power = ieee80211_chandef_max_power(&chandef);
 143
 144         rcu_read_lock();
 145         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 146                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 147                         continue;
 148                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 149                         continue;
 150                 power = min(power, sdata->vif.bss_conf.txpower);
 151         }
 152         rcu_read_unlock();
 153
 154         if (local->hw.conf.power_level != power) {
 155                 changed |= IEEE80211_CONF_CHANGE_POWER;
 156                 local->hw.conf.power_level = power;
 157         }
 158
 159         return changed;
 160 }
 161
 162 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 163 {
 164         int ret = 0;
 165
 166         might_sleep();
 167
 168         if (!local->use_chanctx)
 169                 changed |= ieee80211_hw_conf_chan(local);
 170         else
 171                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 172                              IEEE80211_CONF_CHANGE_POWER);
 173
 174         if (changed && local->open_count) {
 175                 ret = drv_config(local, changed);
 176                 /*
 177                  * Goal:
 178                  * HW reconfiguration should never fail, the driver has told
 179                  * us what it can support so it should live up to that promise.
 180                  *
 181                  * Current status:
 182                  * rfkill is not integrated with mac80211 and a
 183                  * configuration command can thus fail if hardware rfkill
 184                  * is enabled
 185                  *
 186                  * FIXME: integrate rfkill with mac80211 and then add this
 187                  * WARN_ON() back
 188                  *
 189                  */
 190                 /* WARN_ON(ret); */
 191         }
 192
 193         return ret;
 194 }
 195
 196 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 197                                       u32 changed)
 198 {
 199         struct ieee80211_local *local = sdata->local;
 200
 201         if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 202                 return;
 203
 204         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 205 }
 206
 207 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 208 {
 209         sdata->vif.bss_conf.use_cts_prot = false;
 210         sdata->vif.bss_conf.use_short_preamble = false;
 211         sdata->vif.bss_conf.use_short_slot = false;
 212         return BSS_CHANGED_ERP_CTS_PROT |
 213                BSS_CHANGED_ERP_PREAMBLE |
 214                BSS_CHANGED_ERP_SLOT;
 215 }
 216
 217 static void ieee80211_tasklet_handler(unsigned long data)
 218 {
 219         struct ieee80211_local *local = (struct ieee80211_local *) data;
 220         struct sk_buff *skb;
 221
 222         while ((skb = skb_dequeue(&local->skb_queue)) ||
 223                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 224                 switch (skb->pkt_type) {
 225                 case IEEE80211_RX_MSG:
 226                         /* Clear skb->pkt_type in order to not confuse kernel
 227                          * netstack. */
 228                         skb->pkt_type = 0;
 229                         ieee80211_rx(&local->hw, skb);
 230                         break;
 231                 case IEEE80211_TX_STATUS_MSG:
 232                         skb->pkt_type = 0;
 233                         ieee80211_tx_status(&local->hw, skb);
 234                         break;
 235                 default:
 236                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 237                              skb->pkt_type);
 238                         dev_kfree_skb(skb);
 239                         break;
 240                 }
 241         }
 242 }
 243
 244 static void ieee80211_restart_work(struct work_struct *work)
 245 {
 246         struct ieee80211_local *local =
 247                 container_of(work, struct ieee80211_local, restart_work);
 248         struct ieee80211_sub_if_data *sdata;
 249
 250         /* wait for scan work complete */
 251         flush_workqueue(local->workqueue);
 252         flush_work(&local->sched_scan_stopped_work);
 253
 254         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 255              "%s called with hardware scan in progress\n", __func__);
 256
 257         flush_work(&local->radar_detected_work);
 258         rtnl_lock();
 259         list_for_each_entry(sdata, &local->interfaces, list)
 260                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 261         ieee80211_scan_cancel(local);
 262
 263         /* make sure any new ROC will consider local->in_reconfig */
 264         flush_delayed_work(&local->roc_work);
 265         flush_work(&local->hw_roc_done);
 266
 267         /* wait for all packet processing to be done */
 268         synchronize_net();
 269
 270         ieee80211_reconfig(local);
 271         rtnl_unlock();
 272 }
 273
 274 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 275 {
 276         struct ieee80211_local *local = hw_to_local(hw);
 277
 278         trace_api_restart_hw(local);
 279
 280         wiphy_info(hw->wiphy,
 281                    "Hardware restart was requested\n");
 282
 283         /* use this reason, ieee80211_reconfig will unblock it */
 284         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 285                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 286                                         false);
 287
 288         /*
 289          * Stop all Rx during the reconfig. We don't want state changes
 290          * or driver callbacks while this is in progress.
 291          */
 292         local->in_reconfig = true;
 293         barrier();
 294
 295         queue_work(system_freezable_wq, &local->restart_work);
 296 }
 297 EXPORT_SYMBOL(ieee80211_restart_hw);
 298
 299 #ifdef CONFIG_INET
 300 static int ieee80211_ifa_changed(struct notifier_block *nb,
 301                                  unsigned long data, void *arg)
 302 {
 303         struct in_ifaddr *ifa = arg;
 304         struct ieee80211_local *local =
 305                 container_of(nb, struct ieee80211_local,
 306                              ifa_notifier);
 307         struct net_device *ndev = ifa->ifa_dev->dev;
 308         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 309         struct in_device *idev;
 310         struct ieee80211_sub_if_data *sdata;
 311         struct ieee80211_bss_conf *bss_conf;
 312         struct ieee80211_if_managed *ifmgd;
 313         int c = 0;
 314
 315         /* Make sure it's our interface that got changed */
 316         if (!wdev)
 317                 return NOTIFY_DONE;
 318
 319         if (wdev->wiphy != local->hw.wiphy)
 320                 return NOTIFY_DONE;
 321
 322         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 323         bss_conf = &sdata->vif.bss_conf;
 324
 325         /* ARP filtering is only supported in managed mode */
 326         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 327                 return NOTIFY_DONE;
 328
 329         idev = __in_dev_get_rtnl(sdata->dev);
 330         if (!idev)
 331                 return NOTIFY_DONE;
 332
 333         ifmgd = &sdata->u.mgd;
 334         sdata_lock(sdata);
 335
 336         /* Copy the addresses to the bss_conf list */
 337         ifa = idev->ifa_list;
 338         while (ifa) {
 339                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 340                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 341                 ifa = ifa->ifa_next;
 342                 c++;
 343         }
 344
 345         bss_conf->arp_addr_cnt = c;
 346
 347         /* Configure driver only if associated (which also implies it is up) */
 348         if (ifmgd->associated)
 349                 ieee80211_bss_info_change_notify(sdata,
 350                                                  BSS_CHANGED_ARP_FILTER);
 351
 352         sdata_unlock(sdata);
 353
 354         return NOTIFY_OK;
 355 }
 356 #endif
 357
 358 #if IS_ENABLED(CONFIG_IPV6)
 359 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 360                                   unsigned long data, void *arg)
 361 {
 362         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 363         struct inet6_dev *idev = ifa->idev;
 364         struct net_device *ndev = ifa->idev->dev;
 365         struct ieee80211_local *local =
 366                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 367         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 368         struct ieee80211_sub_if_data *sdata;
 369
 370         /* Make sure it's our interface that got changed */
 371         if (!wdev || wdev->wiphy != local->hw.wiphy)
 372                 return NOTIFY_DONE;
 373
 374         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 375
 376         /*
 377          * For now only support station mode. This is mostly because
 378          * doing AP would have to handle AP_VLAN in some way ...
 379          */
 380         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 381                 return NOTIFY_DONE;
 382
 383         drv_ipv6_addr_change(local, sdata, idev);
 384
 385         return NOTIFY_OK;
 386 }
 387 #endif
 388
 389 /* There isn't a lot of sense in it, but you can transmit anything you like */
 390 static const struct ieee80211_txrx_stypes
 391 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 392         [NL80211_IFTYPE_ADHOC] = {
 393                 .tx = 0xffff,
 394                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 395                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 396                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 398         },
 399         [NL80211_IFTYPE_STATION] = {
 400                 .tx = 0xffff,
 401                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 402                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 403         },
 404         [NL80211_IFTYPE_AP] = {
 405                 .tx = 0xffff,
 406                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 407                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 408                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 409                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 410                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 411                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 412                         BIT(IEEE80211_STYPE_ACTION >> 4),
 413         },
 414         [NL80211_IFTYPE_AP_VLAN] = {
 415                 /* copy AP */
 416                 .tx = 0xffff,
 417                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 418                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 419                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 420                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 421                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 422                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 423                         BIT(IEEE80211_STYPE_ACTION >> 4),
 424         },
 425         [NL80211_IFTYPE_P2P_CLIENT] = {
 426                 .tx = 0xffff,
 427                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 428                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 429         },
 430         [NL80211_IFTYPE_P2P_GO] = {
 431                 .tx = 0xffff,
 432                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 433                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 434                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 435                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 436                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 437                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 438                         BIT(IEEE80211_STYPE_ACTION >> 4),
 439         },
 440         [NL80211_IFTYPE_MESH_POINT] = {
 441                 .tx = 0xffff,
 442                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 443                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 444                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 445         },
 446         [NL80211_IFTYPE_P2P_DEVICE] = {
 447                 .tx = 0xffff,
 448                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 450         },
 451 };
 452
 453 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 454         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 455                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 456
 457         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 458                                 IEEE80211_HT_CAP_MAX_AMSDU |
 459                                 IEEE80211_HT_CAP_SGI_20 |
 460                                 IEEE80211_HT_CAP_SGI_40 |
 461                                 IEEE80211_HT_CAP_LDPC_CODING |
 462                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
 463         .mcs = {
 464                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 465                              0xff, 0xff, 0xff, 0xff, 0xff, },
 466         },
 467 };
 468
 469 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 470         .vht_cap_info =
 471                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 472                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 473                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 474                             IEEE80211_VHT_CAP_RXSTBC_1 |
 475                             IEEE80211_VHT_CAP_RXSTBC_2 |
 476                             IEEE80211_VHT_CAP_RXSTBC_3 |
 477                             IEEE80211_VHT_CAP_RXSTBC_4 |
 478                             IEEE80211_VHT_CAP_TXSTBC |
 479                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 480                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 481                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 482                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 483                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 484         .supp_mcs = {
 485                 .rx_mcs_map = cpu_to_le16(~0),
 486                 .tx_mcs_map = cpu_to_le16(~0),
 487         },
 488 };
 489
 490 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 491                                            const struct ieee80211_ops *ops,
 492                                            const char *requested_name)
 493 {
 494         struct ieee80211_local *local;
 495         int priv_size, i;
 496         struct wiphy *wiphy;
 497         bool use_chanctx;
 498
 499         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 500                     !ops->add_interface || !ops->remove_interface ||
 501                     !ops->configure_filter))
 502                 return NULL;
 503
 504         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 505                 return NULL;
 506
 507         /* check all or no channel context operations exist */
 508         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 509             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 510             !!ops->unassign_vif_chanctx;
 511         if (WARN_ON(i != 0 && i != 5))
 512                 return NULL;
 513         use_chanctx = i == 5;
 514
 515         /* Ensure 32-byte alignment of our private data and hw private data.
 516          * We use the wiphy priv data for both our ieee80211_local and for
 517          * the driver's private data
 518          *
 519          * In memory it'll be like this:
 520          *
 521          * +-------------------------+
 522          * | struct wiphy           |
 523          * +-------------------------+
 524          * | struct ieee80211_local  |
 525          * +-------------------------+
 526          * | driver's private data   |
 527          * +-------------------------+
 528          *
 529          */
 530         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 531
 532         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
 533
 534         if (!wiphy)
 535                 return NULL;
 536
 537         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 538
 539         wiphy->privid = mac80211_wiphy_privid;
 540
 541         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 542                         WIPHY_FLAG_4ADDR_AP |
 543                         WIPHY_FLAG_4ADDR_STATION |
 544                         WIPHY_FLAG_REPORTS_OBSS |
 545                         WIPHY_FLAG_OFFCHAN_TX;
 546
 547         if (ops->remain_on_channel)
 548                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 549
 550         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 551                            NL80211_FEATURE_SAE |
 552                            NL80211_FEATURE_HT_IBSS |
 553                            NL80211_FEATURE_VIF_TXPOWER |
 554                            NL80211_FEATURE_MAC_ON_CREATE |
 555                            NL80211_FEATURE_USERSPACE_MPM |
 556                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 557         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
 558         wiphy_ext_feature_set(wiphy,
 559                               NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);
 560
 561         if (!ops->hw_scan) {
 562                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 563                                    NL80211_FEATURE_AP_SCAN;
 564                 /*
 565                  * if the driver behaves correctly using the probe request
 566                  * (template) from mac80211, then both of these should be
 567                  * supported even with hw scan - but let drivers opt in.
 568                  */
 569                 wiphy_ext_feature_set(wiphy,
 570                                       NL80211_EXT_FEATURE_SCAN_RANDOM_SN);
 571                 wiphy_ext_feature_set(wiphy,
 572                                       NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT);
 573         }
 574
 575         if (!ops->set_key)
 576                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 577
 578         if (ops->wake_tx_queue)
 579                 wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_TXQS);
 580
 581         wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);
 582
 583         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 584
 585         local = wiphy_priv(wiphy);
 586
 587         if (sta_info_init(local))
 588                 goto err_free;
 589
 590         local->hw.wiphy = wiphy;
 591
 592         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 593
 594         local->ops = ops;
 595         local->use_chanctx = use_chanctx;
 596
 597         /* set up some defaults */
 598         local->hw.queues = 1;
 599         local->hw.max_rates = 1;
 600         local->hw.max_report_rates = 0;
 601         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
 602         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT;
 603         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 604         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 605         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 606         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 607                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 608                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 609         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 610                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 611         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 612         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 613         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 614         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 615         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 616
 617         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
 618
 619         wiphy->extended_capabilities = local->ext_capa;
 620         wiphy->extended_capabilities_mask = local->ext_capa;
 621         wiphy->extended_capabilities_len =
 622                 ARRAY_SIZE(local->ext_capa);
 623
 624         INIT_LIST_HEAD(&local->interfaces);
 625         INIT_LIST_HEAD(&local->mon_list);
 626
 627         __hw_addr_init(&local->mc_list);
 628
 629         mutex_init(&local->iflist_mtx);
 630         mutex_init(&local->mtx);
 631
 632         mutex_init(&local->key_mtx);
 633         spin_lock_init(&local->filter_lock);
 634         spin_lock_init(&local->rx_path_lock);
 635         spin_lock_init(&local->queue_stop_reason_lock);
 636
 637         INIT_LIST_HEAD(&local->chanctx_list);
 638         mutex_init(&local->chanctx_mtx);
 639
 640         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 641
 642         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 643
 644         INIT_WORK(&local->radar_detected_work,
 645                   ieee80211_dfs_radar_detected_work);
 646
 647         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 648         local->smps_mode = IEEE80211_SMPS_OFF;
 649
 650         INIT_WORK(&local->dynamic_ps_enable_work,
 651                   ieee80211_dynamic_ps_enable_work);
 652         INIT_WORK(&local->dynamic_ps_disable_work,
 653                   ieee80211_dynamic_ps_disable_work);
 654         timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0);
 655
 656         INIT_WORK(&local->sched_scan_stopped_work,
 657                   ieee80211_sched_scan_stopped_work);
 658
 659         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
 660
 661         spin_lock_init(&local->ack_status_lock);
 662         idr_init(&local->ack_status_frames);
 663
 664         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 665                 skb_queue_head_init(&local->pending[i]);
 666                 atomic_set(&local->agg_queue_stop[i], 0);
 667         }
 668         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 669                      (unsigned long)local);
 670
 671         tasklet_init(&local->tasklet,
 672                      ieee80211_tasklet_handler,
 673                      (unsigned long) local);
 674
 675         skb_queue_head_init(&local->skb_queue);
 676         skb_queue_head_init(&local->skb_queue_unreliable);
 677         skb_queue_head_init(&local->skb_queue_tdls_chsw);
 678
 679         ieee80211_alloc_led_names(local);
 680
 681         ieee80211_roc_setup(local);
 682
 683         local->hw.radiotap_timestamp.units_pos = -1;
 684         local->hw.radiotap_timestamp.accuracy = -1;
 685
 686         return &local->hw;
 687  err_free:
 688         wiphy_free(wiphy);
 689         return NULL;
 690 }
 691 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
 692
 693 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 694 {
 695         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
 696                           IS_ERR(local->wep_rx_tfm));
 697         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
 698         int n_suites = 0, r = 0, w = 0;
 699         u32 *suites;
 700         static const u32 cipher_suites[] = {
 701                 /* keep WEP first, it may be removed below */
 702                 WLAN_CIPHER_SUITE_WEP40,
 703                 WLAN_CIPHER_SUITE_WEP104,
 704                 WLAN_CIPHER_SUITE_TKIP,
 705                 WLAN_CIPHER_SUITE_CCMP,
 706                 WLAN_CIPHER_SUITE_CCMP_256,
 707                 WLAN_CIPHER_SUITE_GCMP,
 708                 WLAN_CIPHER_SUITE_GCMP_256,
 709
 710                 /* keep last -- depends on hw flags! */
 711                 WLAN_CIPHER_SUITE_AES_CMAC,
 712                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
 713                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
 714                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
 715         };
 716
 717         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
 718             local->hw.wiphy->cipher_suites) {
 719                 /* If the driver advertises, or doesn't support SW crypto,
 720                  * we only need to remove WEP if necessary.
 721                  */
 722                 if (have_wep)
 723                         return 0;
 724
 725                 /* well if it has _no_ ciphers ... fine */
 726                 if (!local->hw.wiphy->n_cipher_suites)
 727                         return 0;
 728
 729                 /* Driver provides cipher suites, but we need to exclude WEP */
 730                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 731                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 732                                  GFP_KERNEL);
 733                 if (!suites)
 734                         return -ENOMEM;
 735
 736                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 737                         u32 suite = local->hw.wiphy->cipher_suites[r];
 738
 739                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 740                             suite == WLAN_CIPHER_SUITE_WEP104)
 741                                 continue;
 742                         suites[w++] = suite;
 743                 }
 744         } else if (!local->hw.cipher_schemes) {
 745                 /* If the driver doesn't have cipher schemes, there's nothing
 746                  * else to do other than assign the (software supported and
 747                  * perhaps offloaded) cipher suites.
 748                  */
 749                 local->hw.wiphy->cipher_suites = cipher_suites;
 750                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 751
 752                 if (!have_mfp)
 753                         local->hw.wiphy->n_cipher_suites -= 4;
 754
 755                 if (!have_wep) {
 756                         local->hw.wiphy->cipher_suites += 2;
 757                         local->hw.wiphy->n_cipher_suites -= 2;
 758                 }
 759
 760                 /* not dynamically allocated, so just return */
 761                 return 0;
 762         } else {
 763                 const struct ieee80211_cipher_scheme *cs;
 764
 765                 cs = local->hw.cipher_schemes;
 766
 767                 /* Driver specifies cipher schemes only (but not cipher suites
 768                  * including the schemes)
 769                  *
 770                  * We start counting ciphers defined by schemes, TKIP, CCMP,
 771                  * CCMP-256, GCMP, and GCMP-256
 772                  */
 773                 n_suites = local->hw.n_cipher_schemes + 5;
 774
 775                 /* check if we have WEP40 and WEP104 */
 776                 if (have_wep)
 777                         n_suites += 2;
 778
 779                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
 780                  * BIP-GMAC-256
 781                  */
 782                 if (have_mfp)
 783                         n_suites += 4;
 784
 785                 suites = kmalloc_array(n_suites, sizeof(u32), GFP_KERNEL);
 786                 if (!suites)
 787                         return -ENOMEM;
 788
 789                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 790                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
 791                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 792                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
 793                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
 794
 795                 if (have_wep) {
 796                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 797                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 798                 }
 799
 800                 if (have_mfp) {
 801                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 802                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
 803                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
 804                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
 805                 }
 806
 807                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
 808                         suites[w++] = cs[r].cipher;
 809                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
 810                                 kfree(suites);
 811                                 return -EINVAL;
 812                         }
 813                 }
 814         }
 815
 816         local->hw.wiphy->cipher_suites = suites;
 817         local->hw.wiphy->n_cipher_suites = w;
 818         local->wiphy_ciphers_allocated = true;
 819
 820         return 0;
 821 }
 822
 823 int ieee80211_register_hw(struct ieee80211_hw *hw)
 824 {
 825         struct ieee80211_local *local = hw_to_local(hw);
 826         int result, i;
 827         enum nl80211_band band;
 828         int channels, max_bitrates;
 829         bool supp_ht, supp_vht, supp_he;
 830         netdev_features_t feature_whitelist;
 831         struct cfg80211_chan_def dflt_chandef = {};
 832
 833         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
 834             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 835              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 836                 return -EINVAL;
 837
 838         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 839             (!local->ops->tdls_channel_switch ||
 840              !local->ops->tdls_cancel_channel_switch ||
 841              !local->ops->tdls_recv_channel_switch))
 842                 return -EOPNOTSUPP;
 843
 844         if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
 845                     !local->ops->set_frag_threshold))
 846                 return -EINVAL;
 847
 848         if (WARN_ON(local->hw.wiphy->interface_modes &
 849                         BIT(NL80211_IFTYPE_NAN) &&
 850                     (!local->ops->start_nan || !local->ops->stop_nan)))
 851                 return -EINVAL;
 852
 853 #ifdef CONFIG_PM
 854         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 855                 return -EINVAL;
 856 #endif
 857
 858         if (!local->use_chanctx) {
 859                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 860                         const struct ieee80211_iface_combination *comb;
 861
 862                         comb = &local->hw.wiphy->iface_combinations[i];
 863
 864                         if (comb->num_different_channels > 1)
 865                                 return -EINVAL;
 866                 }
 867         } else {
 868                 /*
 869                  * WDS is currently prohibited when channel contexts are used
 870                  * because there's no clear definition of which channel WDS
 871                  * type interfaces use
 872                  */
 873                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 874                         return -EINVAL;
 875
 876                 /* DFS is not supported with multi-channel combinations yet */
 877                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 878                         const struct ieee80211_iface_combination *comb;
 879
 880                         comb = &local->hw.wiphy->iface_combinations[i];
 881
 882                         if (comb->radar_detect_widths &&
 883                             comb->num_different_channels > 1)
 884                                 return -EINVAL;
 885                 }
 886         }
 887
 888         /* Only HW csum features are currently compatible with mac80211 */
 889         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 890                             NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
 891                             NETIF_F_GSO_SOFTWARE | NETIF_F_RXCSUM;
 892         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 893                 return -EINVAL;
 894
 895         if (hw->max_report_rates == 0)
 896                 hw->max_report_rates = hw->max_rates;
 897
 898         local->rx_chains = 1;
 899
 900         /*
 901          * generic code guarantees at least one band,
 902          * set this very early because much code assumes
 903          * that hw.conf.channel is assigned
 904          */
 905         channels = 0;
 906         max_bitrates = 0;
 907         supp_ht = false;
 908         supp_vht = false;
 909         supp_he = false;
 910         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 911                 struct ieee80211_supported_band *sband;
 912
 913                 sband = local->hw.wiphy->bands[band];
 914                 if (!sband)
 915                         continue;
 916
 917                 if (!dflt_chandef.chan) {
 918                         cfg80211_chandef_create(&dflt_chandef,
 919                                                 &sband->channels[0],
 920                                                 NL80211_CHAN_NO_HT);
 921                         /* init channel we're on */
 922                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 923                                 local->hw.conf.chandef = dflt_chandef;
 924                                 local->_oper_chandef = dflt_chandef;
 925                         }
 926                         local->monitor_chandef = dflt_chandef;
 927                 }
 928
 929                 channels += sband->n_channels;
 930
 931                 if (max_bitrates < sband->n_bitrates)
 932                         max_bitrates = sband->n_bitrates;
 933                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 934                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 935
 936                 if (!supp_he)
 937                         supp_he = !!ieee80211_get_he_sta_cap(sband);
 938
 939                 if (!sband->ht_cap.ht_supported)
 940                         continue;
 941
 942                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 943                 local->rx_chains =
 944                         max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 945                             local->rx_chains);
 946
 947                 /* no need to mask, SM_PS_DISABLED has all bits set */
 948                 sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 949                                      IEEE80211_HT_CAP_SM_PS_SHIFT;
 950         }
 951
 952         /* if low-level driver supports AP, we also support VLAN.
 953          * drivers advertising SW_CRYPTO_CONTROL should enable AP_VLAN
 954          * based on their support to transmit SW encrypted packets.
 955          */
 956         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP) &&
 957             !ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL)) {
 958                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 959                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 960         }
 961
 962         /* mac80211 always supports monitor */
 963         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 964         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 965
 966         /* mac80211 doesn't support more than one IBSS interface right now */
 967         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 968                 const struct ieee80211_iface_combination *c;
 969                 int j;
 970
 971                 c = &hw->wiphy->iface_combinations[i];
 972
 973                 for (j = 0; j < c->n_limits; j++)
 974                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 975                             c->limits[j].max > 1)
 976                                 return -EINVAL;
 977         }
 978
 979         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 980                                       sizeof(void *) * channels, GFP_KERNEL);
 981         if (!local->int_scan_req)
 982                 return -ENOMEM;
 983
 984         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 985                 if (!local->hw.wiphy->bands[band])
 986                         continue;
 987                 local->int_scan_req->rates[band] = (u32) -1;
 988         }
 989
 990 #ifndef CONFIG_MAC80211_MESH
 991         /* mesh depends on Kconfig, but drivers should set it if they want */
 992         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 993 #endif
 994
 995         /* if the underlying driver supports mesh, mac80211 will (at least)
 996          * provide routing of mesh authentication frames to userspace */
 997         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 998                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 999
1000         /* mac80211 supports control port protocol changing */
1001         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
1002
1003         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
1004                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
1005         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
1006                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
1007                 if (hw->max_signal <= 0) {
1008                         result = -EINVAL;
1009                         goto fail_wiphy_register;
1010                 }
1011         }
1012
1013         /*
1014          * Calculate scan IE length -- we need this to alloc
1015          * memory and to subtract from the driver limit. It
1016          * includes the DS Params, (extended) supported rates, and HT
1017          * information -- SSID is the driver's responsibility.
1018          */
1019         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
1020                 3 /* DS Params */;
1021         if (supp_ht)
1022                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
1023
1024         if (supp_vht)
1025                 local->scan_ies_len +=
1026                         2 + sizeof(struct ieee80211_vht_cap);
1027
1028         /* HE cap element is variable in size - set len to allow max size */
1029         /*
1030          * TODO: 1 is added at the end of the calculation to accommodate for
1031          *      the temporary placing of the HE capabilities IE under EXT.
1032          *      Remove it once it is placed in the final place.
1033          */
1034         if (supp_he)
1035                 local->scan_ies_len +=
1036                         2 + sizeof(struct ieee80211_he_cap_elem) +
1037                         sizeof(struct ieee80211_he_mcs_nss_supp) +
1038                         IEEE80211_HE_PPE_THRES_MAX_LEN + 1;
1039
1040         if (!local->ops->hw_scan) {
1041                 /* For hw_scan, driver needs to set these up. */
1042                 local->hw.wiphy->max_scan_ssids = 4;
1043                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
1044         }
1045
1046         /*
1047          * If the driver supports any scan IEs, then assume the
1048          * limit includes the IEs mac80211 will add, otherwise
1049          * leave it at zero and let the driver sort it out; we
1050          * still pass our IEs to the driver but userspace will
1051          * not be allowed to in that case.
1052          */
1053         if (local->hw.wiphy->max_scan_ie_len)
1054                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
1055
1056         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
1057                                          local->hw.n_cipher_schemes));
1058
1059         result = ieee80211_init_cipher_suites(local);
1060         if (result < 0)
1061                 goto fail_wiphy_register;
1062
1063         if (!local->ops->remain_on_channel)
1064                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1065
1066         /* mac80211 based drivers don't support internal TDLS setup */
1067         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1068                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1069
1070         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1071         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1072                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1073
1074         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
1075
1076         result = wiphy_register(local->hw.wiphy);
1077         if (result < 0)
1078                 goto fail_wiphy_register;
1079
1080         /*
1081          * We use the number of queues for feature tests (QoS, HT) internally
1082          * so restrict them appropriately.
1083          */
1084         if (hw->queues > IEEE80211_MAX_QUEUES)
1085                 hw->queues = IEEE80211_MAX_QUEUES;
1086
1087         local->workqueue =
1088                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1089         if (!local->workqueue) {
1090                 result = -ENOMEM;
1091                 goto fail_workqueue;
1092         }
1093
1094         /*
1095          * The hardware needs headroom for sending the frame,
1096          * and we need some headroom for passing the frame to monitor
1097          * interfaces, but never both at the same time.
1098          */
1099         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1100                                    IEEE80211_TX_STATUS_HEADROOM);
1101
1102         debugfs_hw_add(local);
1103
1104         /*
1105          * if the driver doesn't specify a max listen interval we
1106          * use 5 which should be a safe default
1107          */
1108         if (local->hw.max_listen_interval == 0)
1109                 local->hw.max_listen_interval = 5;
1110
1111         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1112
1113         local->dynamic_ps_forced_timeout = -1;
1114
1115         if (!local->hw.max_nan_de_entries)
1116                 local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
1117
1118         result = ieee80211_wep_init(local);
1119         if (result < 0)
1120                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1121                             result);
1122
1123         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1124
1125         ieee80211_led_init(local);
1126
1127         result = ieee80211_txq_setup_flows(local);
1128         if (result)
1129                 goto fail_flows;
1130
1131         rtnl_lock();
1132
1133         result = ieee80211_init_rate_ctrl_alg(local,
1134                                               hw->rate_control_algorithm);
1135         if (result < 0) {
1136                 wiphy_debug(local->hw.wiphy,
1137                             "Failed to initialize rate control algorithm\n");
1138                 goto fail_rate;
1139         }
1140
1141         /* add one default STA interface if supported */
1142         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1143             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1144                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1145                                           NL80211_IFTYPE_STATION, NULL);
1146                 if (result)
1147                         wiphy_warn(local->hw.wiphy,
1148                                    "Failed to add default virtual iface\n");
1149         }
1150
1151         rtnl_unlock();
1152
1153 #ifdef CONFIG_INET
1154         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1155         result = register_inetaddr_notifier(&local->ifa_notifier);
1156         if (result)
1157                 goto fail_ifa;
1158 #endif
1159
1160 #if IS_ENABLED(CONFIG_IPV6)
1161         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1162         result = register_inet6addr_notifier(&local->ifa6_notifier);
1163         if (result)
1164                 goto fail_ifa6;
1165 #endif
1166
1167         return 0;
1168
1169 #if IS_ENABLED(CONFIG_IPV6)
1170  fail_ifa6:
1171 #ifdef CONFIG_INET
1172         unregister_inetaddr_notifier(&local->ifa_notifier);
1173 #endif
1174 #endif
1175 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1176  fail_ifa:
1177 #endif
1178         rtnl_lock();
1179         rate_control_deinitialize(local);
1180         ieee80211_remove_interfaces(local);
1181  fail_rate:
1182         rtnl_unlock();
1183         ieee80211_led_exit(local);
1184         ieee80211_wep_free(local);
1185         ieee80211_txq_teardown_flows(local);
1186  fail_flows:
1187         destroy_workqueue(local->workqueue);
1188  fail_workqueue:
1189         wiphy_unregister(local->hw.wiphy);
1190  fail_wiphy_register:
1191         if (local->wiphy_ciphers_allocated)
1192                 kfree(local->hw.wiphy->cipher_suites);
1193         kfree(local->int_scan_req);
1194         return result;
1195 }
1196 EXPORT_SYMBOL(ieee80211_register_hw);
1197
1198 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1199 {
1200         struct ieee80211_local *local = hw_to_local(hw);
1201
1202         tasklet_kill(&local->tx_pending_tasklet);
1203         tasklet_kill(&local->tasklet);
1204
1205 #ifdef CONFIG_INET
1206         unregister_inetaddr_notifier(&local->ifa_notifier);
1207 #endif
1208 #if IS_ENABLED(CONFIG_IPV6)
1209         unregister_inet6addr_notifier(&local->ifa6_notifier);
1210 #endif
1211
1212         rtnl_lock();
1213
1214         /*
1215          * At this point, interface list manipulations are fine
1216          * because the driver cannot be handing us frames any
1217          * more and the tasklet is killed.
1218          */
1219         ieee80211_remove_interfaces(local);
1220
1221         rtnl_unlock();
1222
1223         cancel_delayed_work_sync(&local->roc_work);
1224         cancel_work_sync(&local->restart_work);
1225         cancel_work_sync(&local->reconfig_filter);
1226         cancel_work_sync(&local->tdls_chsw_work);
1227         flush_work(&local->sched_scan_stopped_work);
1228         flush_work(&local->radar_detected_work);
1229
1230         ieee80211_clear_tx_pending(local);
1231         rate_control_deinitialize(local);
1232
1233         if (skb_queue_len(&local->skb_queue) ||
1234             skb_queue_len(&local->skb_queue_unreliable))
1235                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1236         skb_queue_purge(&local->skb_queue);
1237         skb_queue_purge(&local->skb_queue_unreliable);
1238         skb_queue_purge(&local->skb_queue_tdls_chsw);
1239         ieee80211_txq_teardown_flows(local);
1240
1241         destroy_workqueue(local->workqueue);
1242         wiphy_unregister(local->hw.wiphy);
1243         ieee80211_wep_free(local);
1244         ieee80211_led_exit(local);
1245         kfree(local->int_scan_req);
1246 }
1247 EXPORT_SYMBOL(ieee80211_unregister_hw);
1248
1249 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1250 {
1251         WARN_ONCE(1, "Have pending ack frames!\n");
1252         kfree_skb(p);
1253         return 0;
1254 }
1255
1256 void ieee80211_free_hw(struct ieee80211_hw *hw)
1257 {
1258         struct ieee80211_local *local = hw_to_local(hw);
1259
1260         mutex_destroy(&local->iflist_mtx);
1261         mutex_destroy(&local->mtx);
1262
1263         if (local->wiphy_ciphers_allocated)
1264                 kfree(local->hw.wiphy->cipher_suites);
1265
1266         idr_for_each(&local->ack_status_frames,
1267                      ieee80211_free_ack_frame, NULL);
1268         idr_destroy(&local->ack_status_frames);
1269
1270         sta_info_stop(local);
1271
1272         ieee80211_free_led_names(local);
1273
1274         wiphy_free(local->hw.wiphy);
1275 }
1276 EXPORT_SYMBOL(ieee80211_free_hw);
1277
1278 static int __init ieee80211_init(void)
1279 {
1280         struct sk_buff *skb;
1281         int ret;
1282
1283         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1284         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1285                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1286
1287         ret = rc80211_minstrel_init();
1288         if (ret)
1289                 return ret;
1290
1291         ret = rc80211_minstrel_ht_init();
1292         if (ret)
1293                 goto err_minstrel;
1294
1295         ret = ieee80211_iface_init();
1296         if (ret)
1297                 goto err_netdev;
1298
1299         return 0;
1300  err_netdev:
1301         rc80211_minstrel_ht_exit();
1302  err_minstrel:
1303         rc80211_minstrel_exit();
1304
1305         return ret;
1306 }
1307
1308 static void __exit ieee80211_exit(void)
1309 {
1310         rc80211_minstrel_ht_exit();
1311         rc80211_minstrel_exit();
1312
1313         ieee80211s_stop();
1314
1315         ieee80211_iface_exit();
1316
1317         rcu_barrier();
1318 }
1319
1320
1321 subsys_initcall(ieee80211_init);
1322 module_exit(ieee80211_exit);
1323
1324 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1325 MODULE_LICENSE("GPL");