net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <net/mac80211.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/addrconf.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "led.h"
  34 #include "cfg.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
 253         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 254              "%s called with hardware scan in progress\n", __func__);
 255
 256         rtnl_lock();
 257         list_for_each_entry(sdata, &local->interfaces, list)
 258                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 259         ieee80211_scan_cancel(local);
 260         ieee80211_reconfig(local);
 261         rtnl_unlock();
 262 }
 263
 264 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 265 {
 266         struct ieee80211_local *local = hw_to_local(hw);
 267
 268         trace_api_restart_hw(local);
 269
 270         wiphy_info(hw->wiphy,
 271                    "Hardware restart was requested\n");
 272
 273         /* use this reason, ieee80211_reconfig will unblock it */
 274         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 275                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 276                                         false);
 277
 278         /*
 279          * Stop all Rx during the reconfig. We don't want state changes
 280          * or driver callbacks while this is in progress.
 281          */
 282         local->in_reconfig = true;
 283         barrier();
 284
 285         schedule_work(&local->restart_work);
 286 }
 287 EXPORT_SYMBOL(ieee80211_restart_hw);
 288
 289 #ifdef CONFIG_INET
 290 static int ieee80211_ifa_changed(struct notifier_block *nb,
 291                                  unsigned long data, void *arg)
 292 {
 293         struct in_ifaddr *ifa = arg;
 294         struct ieee80211_local *local =
 295                 container_of(nb, struct ieee80211_local,
 296                              ifa_notifier);
 297         struct net_device *ndev = ifa->ifa_dev->dev;
 298         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 299         struct in_device *idev;
 300         struct ieee80211_sub_if_data *sdata;
 301         struct ieee80211_bss_conf *bss_conf;
 302         struct ieee80211_if_managed *ifmgd;
 303         int c = 0;
 304
 305         /* Make sure it's our interface that got changed */
 306         if (!wdev)
 307                 return NOTIFY_DONE;
 308
 309         if (wdev->wiphy != local->hw.wiphy)
 310                 return NOTIFY_DONE;
 311
 312         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 313         bss_conf = &sdata->vif.bss_conf;
 314
 315         /* ARP filtering is only supported in managed mode */
 316         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 317                 return NOTIFY_DONE;
 318
 319         idev = __in_dev_get_rtnl(sdata->dev);
 320         if (!idev)
 321                 return NOTIFY_DONE;
 322
 323         ifmgd = &sdata->u.mgd;
 324         sdata_lock(sdata);
 325
 326         /* Copy the addresses to the bss_conf list */
 327         ifa = idev->ifa_list;
 328         while (ifa) {
 329                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 330                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 331                 ifa = ifa->ifa_next;
 332                 c++;
 333         }
 334
 335         bss_conf->arp_addr_cnt = c;
 336
 337         /* Configure driver only if associated (which also implies it is up) */
 338         if (ifmgd->associated)
 339                 ieee80211_bss_info_change_notify(sdata,
 340                                                  BSS_CHANGED_ARP_FILTER);
 341
 342         sdata_unlock(sdata);
 343
 344         return NOTIFY_OK;
 345 }
 346 #endif
 347
 348 #if IS_ENABLED(CONFIG_IPV6)
 349 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 350                                   unsigned long data, void *arg)
 351 {
 352         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 353         struct inet6_dev *idev = ifa->idev;
 354         struct net_device *ndev = ifa->idev->dev;
 355         struct ieee80211_local *local =
 356                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 357         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 358         struct ieee80211_sub_if_data *sdata;
 359
 360         /* Make sure it's our interface that got changed */
 361         if (!wdev || wdev->wiphy != local->hw.wiphy)
 362                 return NOTIFY_DONE;
 363
 364         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 365
 366         /*
 367          * For now only support station mode. This is mostly because
 368          * doing AP would have to handle AP_VLAN in some way ...
 369          */
 370         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 371                 return NOTIFY_DONE;
 372
 373         drv_ipv6_addr_change(local, sdata, idev);
 374
 375         return NOTIFY_OK;
 376 }
 377 #endif
 378
 379 /* There isn't a lot of sense in it, but you can transmit anything you like */
 380 static const struct ieee80211_txrx_stypes
 381 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 382         [NL80211_IFTYPE_ADHOC] = {
 383                 .tx = 0xffff,
 384                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 385                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 386                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 387                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 388         },
 389         [NL80211_IFTYPE_STATION] = {
 390                 .tx = 0xffff,
 391                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 392                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 393         },
 394         [NL80211_IFTYPE_AP] = {
 395                 .tx = 0xffff,
 396                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 397                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 398                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 399                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 400                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 401                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 402                         BIT(IEEE80211_STYPE_ACTION >> 4),
 403         },
 404         [NL80211_IFTYPE_AP_VLAN] = {
 405                 /* copy AP */
 406                 .tx = 0xffff,
 407                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 408                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 409                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 410                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 411                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 412                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 413                         BIT(IEEE80211_STYPE_ACTION >> 4),
 414         },
 415         [NL80211_IFTYPE_P2P_CLIENT] = {
 416                 .tx = 0xffff,
 417                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 418                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 419         },
 420         [NL80211_IFTYPE_P2P_GO] = {
 421                 .tx = 0xffff,
 422                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 423                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 424                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 425                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 426                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 427                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 428                         BIT(IEEE80211_STYPE_ACTION >> 4),
 429         },
 430         [NL80211_IFTYPE_MESH_POINT] = {
 431                 .tx = 0xffff,
 432                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 433                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 434                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 435         },
 436         [NL80211_IFTYPE_P2P_DEVICE] = {
 437                 .tx = 0xffff,
 438                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 439                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 440         },
 441 };
 442
 443 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 444         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 445                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 446
 447         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 448                                 IEEE80211_HT_CAP_MAX_AMSDU |
 449                                 IEEE80211_HT_CAP_SGI_20 |
 450                                 IEEE80211_HT_CAP_SGI_40 |
 451                                 IEEE80211_HT_CAP_LDPC_CODING |
 452                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
 453         .mcs = {
 454                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 455                              0xff, 0xff, 0xff, 0xff, 0xff, },
 456         },
 457 };
 458
 459 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 460         .vht_cap_info =
 461                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 462                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 463                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 464                             IEEE80211_VHT_CAP_RXSTBC_1 |
 465                             IEEE80211_VHT_CAP_RXSTBC_2 |
 466                             IEEE80211_VHT_CAP_RXSTBC_3 |
 467                             IEEE80211_VHT_CAP_RXSTBC_4 |
 468                             IEEE80211_VHT_CAP_TXSTBC |
 469                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 470                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 471                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 472                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 473                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 474         .supp_mcs = {
 475                 .rx_mcs_map = cpu_to_le16(~0),
 476                 .tx_mcs_map = cpu_to_le16(~0),
 477         },
 478 };
 479
 480 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 481                                            const struct ieee80211_ops *ops,
 482                                            const char *requested_name)
 483 {
 484         struct ieee80211_local *local;
 485         int priv_size, i;
 486         struct wiphy *wiphy;
 487         bool use_chanctx;
 488
 489         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 490                     !ops->add_interface || !ops->remove_interface ||
 491                     !ops->configure_filter))
 492                 return NULL;
 493
 494         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 495                 return NULL;
 496
 497         /* check all or no channel context operations exist */
 498         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 499             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 500             !!ops->unassign_vif_chanctx;
 501         if (WARN_ON(i != 0 && i != 5))
 502                 return NULL;
 503         use_chanctx = i == 5;
 504
 505         /* Ensure 32-byte alignment of our private data and hw private data.
 506          * We use the wiphy priv data for both our ieee80211_local and for
 507          * the driver's private data
 508          *
 509          * In memory it'll be like this:
 510          *
 511          * +-------------------------+
 512          * | struct wiphy           |
 513          * +-------------------------+
 514          * | struct ieee80211_local  |
 515          * +-------------------------+
 516          * | driver's private data   |
 517          * +-------------------------+
 518          *
 519          */
 520         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 521
 522         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
 523
 524         if (!wiphy)
 525                 return NULL;
 526
 527         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 528
 529         wiphy->privid = mac80211_wiphy_privid;
 530
 531         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 532                         WIPHY_FLAG_4ADDR_AP |
 533                         WIPHY_FLAG_4ADDR_STATION |
 534                         WIPHY_FLAG_REPORTS_OBSS |
 535                         WIPHY_FLAG_OFFCHAN_TX;
 536
 537         if (ops->remain_on_channel)
 538                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 539
 540         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 541                            NL80211_FEATURE_SAE |
 542                            NL80211_FEATURE_HT_IBSS |
 543                            NL80211_FEATURE_VIF_TXPOWER |
 544                            NL80211_FEATURE_MAC_ON_CREATE |
 545                            NL80211_FEATURE_USERSPACE_MPM |
 546                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 547
 548         if (!ops->hw_scan)
 549                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 550                                    NL80211_FEATURE_AP_SCAN;
 551
 552
 553         if (!ops->set_key)
 554                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 555
 556         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 557
 558         local = wiphy_priv(wiphy);
 559
 560         if (sta_info_init(local))
 561                 goto err_free;
 562
 563         local->hw.wiphy = wiphy;
 564
 565         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 566
 567         local->ops = ops;
 568         local->use_chanctx = use_chanctx;
 569
 570         /* set up some defaults */
 571         local->hw.queues = 1;
 572         local->hw.max_rates = 1;
 573         local->hw.max_report_rates = 0;
 574         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 575         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 576         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 577         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 578         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 579         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 580                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 581                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 582         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 583                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 584         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 585         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 586         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 587         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 588         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 589
 590         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
 591
 592         wiphy->extended_capabilities = local->ext_capa;
 593         wiphy->extended_capabilities_mask = local->ext_capa;
 594         wiphy->extended_capabilities_len =
 595                 ARRAY_SIZE(local->ext_capa);
 596
 597         INIT_LIST_HEAD(&local->interfaces);
 598
 599         __hw_addr_init(&local->mc_list);
 600
 601         mutex_init(&local->iflist_mtx);
 602         mutex_init(&local->mtx);
 603
 604         mutex_init(&local->key_mtx);
 605         spin_lock_init(&local->filter_lock);
 606         spin_lock_init(&local->rx_path_lock);
 607         spin_lock_init(&local->queue_stop_reason_lock);
 608
 609         INIT_LIST_HEAD(&local->chanctx_list);
 610         mutex_init(&local->chanctx_mtx);
 611
 612         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 613
 614         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 615
 616         INIT_WORK(&local->radar_detected_work,
 617                   ieee80211_dfs_radar_detected_work);
 618
 619         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 620         local->smps_mode = IEEE80211_SMPS_OFF;
 621
 622         INIT_WORK(&local->dynamic_ps_enable_work,
 623                   ieee80211_dynamic_ps_enable_work);
 624         INIT_WORK(&local->dynamic_ps_disable_work,
 625                   ieee80211_dynamic_ps_disable_work);
 626         setup_timer(&local->dynamic_ps_timer,
 627                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 628
 629         INIT_WORK(&local->sched_scan_stopped_work,
 630                   ieee80211_sched_scan_stopped_work);
 631
 632         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
 633
 634         spin_lock_init(&local->ack_status_lock);
 635         idr_init(&local->ack_status_frames);
 636
 637         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 638                 skb_queue_head_init(&local->pending[i]);
 639                 atomic_set(&local->agg_queue_stop[i], 0);
 640         }
 641         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 642                      (unsigned long)local);
 643
 644         tasklet_init(&local->tasklet,
 645                      ieee80211_tasklet_handler,
 646                      (unsigned long) local);
 647
 648         skb_queue_head_init(&local->skb_queue);
 649         skb_queue_head_init(&local->skb_queue_unreliable);
 650         skb_queue_head_init(&local->skb_queue_tdls_chsw);
 651
 652         ieee80211_alloc_led_names(local);
 653
 654         ieee80211_roc_setup(local);
 655
 656         return &local->hw;
 657  err_free:
 658         wiphy_free(wiphy);
 659         return NULL;
 660 }
 661 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
 662
 663 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 664 {
 665         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
 666                           IS_ERR(local->wep_rx_tfm));
 667         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
 668         int n_suites = 0, r = 0, w = 0;
 669         u32 *suites;
 670         static const u32 cipher_suites[] = {
 671                 /* keep WEP first, it may be removed below */
 672                 WLAN_CIPHER_SUITE_WEP40,
 673                 WLAN_CIPHER_SUITE_WEP104,
 674                 WLAN_CIPHER_SUITE_TKIP,
 675                 WLAN_CIPHER_SUITE_CCMP,
 676                 WLAN_CIPHER_SUITE_CCMP_256,
 677                 WLAN_CIPHER_SUITE_GCMP,
 678                 WLAN_CIPHER_SUITE_GCMP_256,
 679
 680                 /* keep last -- depends on hw flags! */
 681                 WLAN_CIPHER_SUITE_AES_CMAC,
 682                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
 683                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
 684                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
 685         };
 686
 687         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
 688             local->hw.wiphy->cipher_suites) {
 689                 /* If the driver advertises, or doesn't support SW crypto,
 690                  * we only need to remove WEP if necessary.
 691                  */
 692                 if (have_wep)
 693                         return 0;
 694
 695                 /* well if it has _no_ ciphers ... fine */
 696                 if (!local->hw.wiphy->n_cipher_suites)
 697                         return 0;
 698
 699                 /* Driver provides cipher suites, but we need to exclude WEP */
 700                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 701                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 702                                  GFP_KERNEL);
 703                 if (!suites)
 704                         return -ENOMEM;
 705
 706                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 707                         u32 suite = local->hw.wiphy->cipher_suites[r];
 708
 709                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 710                             suite == WLAN_CIPHER_SUITE_WEP104)
 711                                 continue;
 712                         suites[w++] = suite;
 713                 }
 714         } else if (!local->hw.cipher_schemes) {
 715                 /* If the driver doesn't have cipher schemes, there's nothing
 716                  * else to do other than assign the (software supported and
 717                  * perhaps offloaded) cipher suites.
 718                  */
 719                 local->hw.wiphy->cipher_suites = cipher_suites;
 720                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 721
 722                 if (!have_mfp)
 723                         local->hw.wiphy->n_cipher_suites -= 4;
 724
 725                 if (!have_wep) {
 726                         local->hw.wiphy->cipher_suites += 2;
 727                         local->hw.wiphy->n_cipher_suites -= 2;
 728                 }
 729
 730                 /* not dynamically allocated, so just return */
 731                 return 0;
 732         } else {
 733                 const struct ieee80211_cipher_scheme *cs;
 734
 735                 cs = local->hw.cipher_schemes;
 736
 737                 /* Driver specifies cipher schemes only (but not cipher suites
 738                  * including the schemes)
 739                  *
 740                  * We start counting ciphers defined by schemes, TKIP, CCMP,
 741                  * CCMP-256, GCMP, and GCMP-256
 742                  */
 743                 n_suites = local->hw.n_cipher_schemes + 5;
 744
 745                 /* check if we have WEP40 and WEP104 */
 746                 if (have_wep)
 747                         n_suites += 2;
 748
 749                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
 750                  * BIP-GMAC-256
 751                  */
 752                 if (have_mfp)
 753                         n_suites += 4;
 754
 755                 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
 756                 if (!suites)
 757                         return -ENOMEM;
 758
 759                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 760                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
 761                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 762                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
 763                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
 764
 765                 if (have_wep) {
 766                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 767                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 768                 }
 769
 770                 if (have_mfp) {
 771                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 772                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
 773                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
 774                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
 775                 }
 776
 777                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
 778                         suites[w++] = cs[r].cipher;
 779                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
 780                                 kfree(suites);
 781                                 return -EINVAL;
 782                         }
 783                 }
 784         }
 785
 786         local->hw.wiphy->cipher_suites = suites;
 787         local->hw.wiphy->n_cipher_suites = w;
 788         local->wiphy_ciphers_allocated = true;
 789
 790         return 0;
 791 }
 792
 793 int ieee80211_register_hw(struct ieee80211_hw *hw)
 794 {
 795         struct ieee80211_local *local = hw_to_local(hw);
 796         int result, i;
 797         enum ieee80211_band band;
 798         int channels, max_bitrates;
 799         bool supp_ht, supp_vht;
 800         netdev_features_t feature_whitelist;
 801         struct cfg80211_chan_def dflt_chandef = {};
 802
 803         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
 804             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 805              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 806                 return -EINVAL;
 807
 808         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 809             (!local->ops->tdls_channel_switch ||
 810              !local->ops->tdls_cancel_channel_switch ||
 811              !local->ops->tdls_recv_channel_switch))
 812                 return -EOPNOTSUPP;
 813
 814 #ifdef CONFIG_PM
 815         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 816                 return -EINVAL;
 817 #endif
 818
 819         if (!local->use_chanctx) {
 820                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 821                         const struct ieee80211_iface_combination *comb;
 822
 823                         comb = &local->hw.wiphy->iface_combinations[i];
 824
 825                         if (comb->num_different_channels > 1)
 826                                 return -EINVAL;
 827                 }
 828         } else {
 829                 /*
 830                  * WDS is currently prohibited when channel contexts are used
 831                  * because there's no clear definition of which channel WDS
 832                  * type interfaces use
 833                  */
 834                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 835                         return -EINVAL;
 836
 837                 /* DFS is not supported with multi-channel combinations yet */
 838                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 839                         const struct ieee80211_iface_combination *comb;
 840
 841                         comb = &local->hw.wiphy->iface_combinations[i];
 842
 843                         if (comb->radar_detect_widths &&
 844                             comb->num_different_channels > 1)
 845                                 return -EINVAL;
 846                 }
 847         }
 848
 849         /* Only HW csum features are currently compatible with mac80211 */
 850         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 851                             NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
 852                             NETIF_F_GSO_SOFTWARE;
 853         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 854                 return -EINVAL;
 855
 856         if (hw->max_report_rates == 0)
 857                 hw->max_report_rates = hw->max_rates;
 858
 859         local->rx_chains = 1;
 860
 861         /*
 862          * generic code guarantees at least one band,
 863          * set this very early because much code assumes
 864          * that hw.conf.channel is assigned
 865          */
 866         channels = 0;
 867         max_bitrates = 0;
 868         supp_ht = false;
 869         supp_vht = false;
 870         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 871                 struct ieee80211_supported_band *sband;
 872
 873                 sband = local->hw.wiphy->bands[band];
 874                 if (!sband)
 875                         continue;
 876
 877                 if (!dflt_chandef.chan) {
 878                         cfg80211_chandef_create(&dflt_chandef,
 879                                                 &sband->channels[0],
 880                                                 NL80211_CHAN_NO_HT);
 881                         /* init channel we're on */
 882                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 883                                 local->hw.conf.chandef = dflt_chandef;
 884                                 local->_oper_chandef = dflt_chandef;
 885                         }
 886                         local->monitor_chandef = dflt_chandef;
 887                 }
 888
 889                 channels += sband->n_channels;
 890
 891                 if (max_bitrates < sband->n_bitrates)
 892                         max_bitrates = sband->n_bitrates;
 893                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 894                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 895
 896                 if (sband->ht_cap.ht_supported)
 897                         local->rx_chains =
 898                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 899                                     local->rx_chains);
 900
 901                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 902         }
 903
 904         /* if low-level driver supports AP, we also support VLAN */
 905         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 906                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 907                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 908         }
 909
 910         /* mac80211 always supports monitor */
 911         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 912         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 913
 914         /* mac80211 doesn't support more than one IBSS interface right now */
 915         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 916                 const struct ieee80211_iface_combination *c;
 917                 int j;
 918
 919                 c = &hw->wiphy->iface_combinations[i];
 920
 921                 for (j = 0; j < c->n_limits; j++)
 922                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 923                             c->limits[j].max > 1)
 924                                 return -EINVAL;
 925         }
 926
 927         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 928                                       sizeof(void *) * channels, GFP_KERNEL);
 929         if (!local->int_scan_req)
 930                 return -ENOMEM;
 931
 932         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 933                 if (!local->hw.wiphy->bands[band])
 934                         continue;
 935                 local->int_scan_req->rates[band] = (u32) -1;
 936         }
 937
 938 #ifndef CONFIG_MAC80211_MESH
 939         /* mesh depends on Kconfig, but drivers should set it if they want */
 940         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 941 #endif
 942
 943         /* if the underlying driver supports mesh, mac80211 will (at least)
 944          * provide routing of mesh authentication frames to userspace */
 945         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 946                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 947
 948         /* mac80211 supports control port protocol changing */
 949         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 950
 951         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
 952                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 953         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
 954                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 955                 if (hw->max_signal <= 0) {
 956                         result = -EINVAL;
 957                         goto fail_wiphy_register;
 958                 }
 959         }
 960
 961         /*
 962          * Calculate scan IE length -- we need this to alloc
 963          * memory and to subtract from the driver limit. It
 964          * includes the DS Params, (extended) supported rates, and HT
 965          * information -- SSID is the driver's responsibility.
 966          */
 967         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 968                 3 /* DS Params */;
 969         if (supp_ht)
 970                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 971
 972         if (supp_vht)
 973                 local->scan_ies_len +=
 974                         2 + sizeof(struct ieee80211_vht_cap);
 975
 976         if (!local->ops->hw_scan) {
 977                 /* For hw_scan, driver needs to set these up. */
 978                 local->hw.wiphy->max_scan_ssids = 4;
 979                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 980         }
 981
 982         /*
 983          * If the driver supports any scan IEs, then assume the
 984          * limit includes the IEs mac80211 will add, otherwise
 985          * leave it at zero and let the driver sort it out; we
 986          * still pass our IEs to the driver but userspace will
 987          * not be allowed to in that case.
 988          */
 989         if (local->hw.wiphy->max_scan_ie_len)
 990                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 991
 992         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
 993                                          local->hw.n_cipher_schemes));
 994
 995         result = ieee80211_init_cipher_suites(local);
 996         if (result < 0)
 997                 goto fail_wiphy_register;
 998
 999         if (!local->ops->remain_on_channel)
1000                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1001
1002         /* mac80211 based drivers don't support internal TDLS setup */
1003         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1004                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1005
1006         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1007         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1008                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1009
1010         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
1011
1012         result = wiphy_register(local->hw.wiphy);
1013         if (result < 0)
1014                 goto fail_wiphy_register;
1015
1016         /*
1017          * We use the number of queues for feature tests (QoS, HT) internally
1018          * so restrict them appropriately.
1019          */
1020         if (hw->queues > IEEE80211_MAX_QUEUES)
1021                 hw->queues = IEEE80211_MAX_QUEUES;
1022
1023         local->workqueue =
1024                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1025         if (!local->workqueue) {
1026                 result = -ENOMEM;
1027                 goto fail_workqueue;
1028         }
1029
1030         /*
1031          * The hardware needs headroom for sending the frame,
1032          * and we need some headroom for passing the frame to monitor
1033          * interfaces, but never both at the same time.
1034          */
1035         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1036                                    IEEE80211_TX_STATUS_HEADROOM);
1037
1038         debugfs_hw_add(local);
1039
1040         /*
1041          * if the driver doesn't specify a max listen interval we
1042          * use 5 which should be a safe default
1043          */
1044         if (local->hw.max_listen_interval == 0)
1045                 local->hw.max_listen_interval = 5;
1046
1047         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1048
1049         local->dynamic_ps_forced_timeout = -1;
1050
1051         if (!local->hw.txq_ac_max_pending)
1052                 local->hw.txq_ac_max_pending = 64;
1053
1054         result = ieee80211_wep_init(local);
1055         if (result < 0)
1056                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1057                             result);
1058
1059         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1060
1061         ieee80211_led_init(local);
1062
1063         rtnl_lock();
1064
1065         result = ieee80211_init_rate_ctrl_alg(local,
1066                                               hw->rate_control_algorithm);
1067         if (result < 0) {
1068                 wiphy_debug(local->hw.wiphy,
1069                             "Failed to initialize rate control algorithm\n");
1070                 goto fail_rate;
1071         }
1072
1073         /* add one default STA interface if supported */
1074         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1075             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1076                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1077                                           NL80211_IFTYPE_STATION, NULL);
1078                 if (result)
1079                         wiphy_warn(local->hw.wiphy,
1080                                    "Failed to add default virtual iface\n");
1081         }
1082
1083         rtnl_unlock();
1084
1085 #ifdef CONFIG_INET
1086         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1087         result = register_inetaddr_notifier(&local->ifa_notifier);
1088         if (result)
1089                 goto fail_ifa;
1090 #endif
1091
1092 #if IS_ENABLED(CONFIG_IPV6)
1093         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1094         result = register_inet6addr_notifier(&local->ifa6_notifier);
1095         if (result)
1096                 goto fail_ifa6;
1097 #endif
1098
1099         return 0;
1100
1101 #if IS_ENABLED(CONFIG_IPV6)
1102  fail_ifa6:
1103 #ifdef CONFIG_INET
1104         unregister_inetaddr_notifier(&local->ifa_notifier);
1105 #endif
1106 #endif
1107 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1108  fail_ifa:
1109 #endif
1110         rtnl_lock();
1111         rate_control_deinitialize(local);
1112         ieee80211_remove_interfaces(local);
1113  fail_rate:
1114         rtnl_unlock();
1115         ieee80211_led_exit(local);
1116         ieee80211_wep_free(local);
1117         destroy_workqueue(local->workqueue);
1118  fail_workqueue:
1119         wiphy_unregister(local->hw.wiphy);
1120  fail_wiphy_register:
1121         if (local->wiphy_ciphers_allocated)
1122                 kfree(local->hw.wiphy->cipher_suites);
1123         kfree(local->int_scan_req);
1124         return result;
1125 }
1126 EXPORT_SYMBOL(ieee80211_register_hw);
1127
1128 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1129 {
1130         struct ieee80211_local *local = hw_to_local(hw);
1131
1132         tasklet_kill(&local->tx_pending_tasklet);
1133         tasklet_kill(&local->tasklet);
1134
1135 #ifdef CONFIG_INET
1136         unregister_inetaddr_notifier(&local->ifa_notifier);
1137 #endif
1138 #if IS_ENABLED(CONFIG_IPV6)
1139         unregister_inet6addr_notifier(&local->ifa6_notifier);
1140 #endif
1141
1142         rtnl_lock();
1143
1144         /*
1145          * At this point, interface list manipulations are fine
1146          * because the driver cannot be handing us frames any
1147          * more and the tasklet is killed.
1148          */
1149         ieee80211_remove_interfaces(local);
1150
1151         rtnl_unlock();
1152
1153         cancel_work_sync(&local->restart_work);
1154         cancel_work_sync(&local->reconfig_filter);
1155         cancel_work_sync(&local->tdls_chsw_work);
1156         flush_work(&local->sched_scan_stopped_work);
1157
1158         ieee80211_clear_tx_pending(local);
1159         rate_control_deinitialize(local);
1160
1161         if (skb_queue_len(&local->skb_queue) ||
1162             skb_queue_len(&local->skb_queue_unreliable))
1163                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1164         skb_queue_purge(&local->skb_queue);
1165         skb_queue_purge(&local->skb_queue_unreliable);
1166         skb_queue_purge(&local->skb_queue_tdls_chsw);
1167
1168         destroy_workqueue(local->workqueue);
1169         wiphy_unregister(local->hw.wiphy);
1170         ieee80211_wep_free(local);
1171         ieee80211_led_exit(local);
1172         kfree(local->int_scan_req);
1173 }
1174 EXPORT_SYMBOL(ieee80211_unregister_hw);
1175
1176 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1177 {
1178         WARN_ONCE(1, "Have pending ack frames!\n");
1179         kfree_skb(p);
1180         return 0;
1181 }
1182
1183 void ieee80211_free_hw(struct ieee80211_hw *hw)
1184 {
1185         struct ieee80211_local *local = hw_to_local(hw);
1186
1187         mutex_destroy(&local->iflist_mtx);
1188         mutex_destroy(&local->mtx);
1189
1190         if (local->wiphy_ciphers_allocated)
1191                 kfree(local->hw.wiphy->cipher_suites);
1192
1193         idr_for_each(&local->ack_status_frames,
1194                      ieee80211_free_ack_frame, NULL);
1195         idr_destroy(&local->ack_status_frames);
1196
1197         sta_info_stop(local);
1198
1199         ieee80211_free_led_names(local);
1200
1201         wiphy_free(local->hw.wiphy);
1202 }
1203 EXPORT_SYMBOL(ieee80211_free_hw);
1204
1205 static int __init ieee80211_init(void)
1206 {
1207         struct sk_buff *skb;
1208         int ret;
1209
1210         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1211         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1212                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1213
1214         ret = rc80211_minstrel_init();
1215         if (ret)
1216                 return ret;
1217
1218         ret = rc80211_minstrel_ht_init();
1219         if (ret)
1220                 goto err_minstrel;
1221
1222         ret = ieee80211_iface_init();
1223         if (ret)
1224                 goto err_netdev;
1225
1226         return 0;
1227  err_netdev:
1228         rc80211_minstrel_ht_exit();
1229  err_minstrel:
1230         rc80211_minstrel_exit();
1231
1232         return ret;
1233 }
1234
1235 static void __exit ieee80211_exit(void)
1236 {
1237         rc80211_minstrel_ht_exit();
1238         rc80211_minstrel_exit();
1239
1240         ieee80211s_stop();
1241
1242         ieee80211_iface_exit();
1243
1244         rcu_barrier();
1245 }
1246
1247
1248 subsys_initcall(ieee80211_init);
1249 module_exit(ieee80211_exit);
1250
1251 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1252 MODULE_LICENSE("GPL");