net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <net/mac80211.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/addrconf.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "led.h"
  34 #include "debugfs.h"
  35
  36 void ieee80211_configure_filter(struct ieee80211_local *local)
  37 {
  38         u64 mc;
  39         unsigned int changed_flags;
  40         unsigned int new_flags = 0;
  41
  42         if (atomic_read(&local->iff_allmultis))
  43                 new_flags |= FIF_ALLMULTI;
  44
  45         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  46             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  47                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  48
  49         if (local->fif_probe_req || local->probe_req_reg)
  50                 new_flags |= FIF_PROBE_REQ;
  51
  52         if (local->fif_fcsfail)
  53                 new_flags |= FIF_FCSFAIL;
  54
  55         if (local->fif_plcpfail)
  56                 new_flags |= FIF_PLCPFAIL;
  57
  58         if (local->fif_control)
  59                 new_flags |= FIF_CONTROL;
  60
  61         if (local->fif_other_bss)
  62                 new_flags |= FIF_OTHER_BSS;
  63
  64         if (local->fif_pspoll)
  65                 new_flags |= FIF_PSPOLL;
  66
  67         spin_lock_bh(&local->filter_lock);
  68         changed_flags = local->filter_flags ^ new_flags;
  69
  70         mc = drv_prepare_multicast(local, &local->mc_list);
  71         spin_unlock_bh(&local->filter_lock);
  72
  73         /* be a bit nasty */
  74         new_flags |= (1<<31);
  75
  76         drv_configure_filter(local, changed_flags, &new_flags, mc);
  77
  78         WARN_ON(new_flags & (1<<31));
  79
  80         local->filter_flags = new_flags & ~(1<<31);
  81 }
  82
  83 static void ieee80211_reconfig_filter(struct work_struct *work)
  84 {
  85         struct ieee80211_local *local =
  86                 container_of(work, struct ieee80211_local, reconfig_filter);
  87
  88         ieee80211_configure_filter(local);
  89 }
  90
  91 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  92 {
  93         struct ieee80211_sub_if_data *sdata;
  94         struct cfg80211_chan_def chandef = {};
  95         u32 changed = 0;
  96         int power;
  97         u32 offchannel_flag;
  98
  99         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 100
 101         if (local->scan_chandef.chan) {
 102                 chandef = local->scan_chandef;
 103         } else if (local->tmp_channel) {
 104                 chandef.chan = local->tmp_channel;
 105                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 106                 chandef.center_freq1 = chandef.chan->center_freq;
 107         } else
 108                 chandef = local->_oper_chandef;
 109
 110         WARN(!cfg80211_chandef_valid(&chandef),
 111              "control:%d MHz width:%d center: %d/%d MHz",
 112              chandef.chan->center_freq, chandef.width,
 113              chandef.center_freq1, chandef.center_freq2);
 114
 115         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
 116                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 117         else
 118                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 119
 120         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 121
 122         if (offchannel_flag ||
 123             !cfg80211_chandef_identical(&local->hw.conf.chandef,
 124                                         &local->_oper_chandef)) {
 125                 local->hw.conf.chandef = chandef;
 126                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 127         }
 128
 129         if (!conf_is_ht(&local->hw.conf)) {
 130                 /*
 131                  * mac80211.h documents that this is only valid
 132                  * when the channel is set to an HT type, and
 133                  * that otherwise STATIC is used.
 134                  */
 135                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 136         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 137                 local->hw.conf.smps_mode = local->smps_mode;
 138                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 139         }
 140
 141         power = ieee80211_chandef_max_power(&chandef);
 142
 143         rcu_read_lock();
 144         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 145                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 146                         continue;
 147                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 148                         continue;
 149                 power = min(power, sdata->vif.bss_conf.txpower);
 150         }
 151         rcu_read_unlock();
 152
 153         if (local->hw.conf.power_level != power) {
 154                 changed |= IEEE80211_CONF_CHANGE_POWER;
 155                 local->hw.conf.power_level = power;
 156         }
 157
 158         return changed;
 159 }
 160
 161 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 162 {
 163         int ret = 0;
 164
 165         might_sleep();
 166
 167         if (!local->use_chanctx)
 168                 changed |= ieee80211_hw_conf_chan(local);
 169         else
 170                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 171                              IEEE80211_CONF_CHANGE_POWER);
 172
 173         if (changed && local->open_count) {
 174                 ret = drv_config(local, changed);
 175                 /*
 176                  * Goal:
 177                  * HW reconfiguration should never fail, the driver has told
 178                  * us what it can support so it should live up to that promise.
 179                  *
 180                  * Current status:
 181                  * rfkill is not integrated with mac80211 and a
 182                  * configuration command can thus fail if hardware rfkill
 183                  * is enabled
 184                  *
 185                  * FIXME: integrate rfkill with mac80211 and then add this
 186                  * WARN_ON() back
 187                  *
 188                  */
 189                 /* WARN_ON(ret); */
 190         }
 191
 192         return ret;
 193 }
 194
 195 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 196                                       u32 changed)
 197 {
 198         struct ieee80211_local *local = sdata->local;
 199
 200         if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 201                 return;
 202
 203         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 204 }
 205
 206 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 207 {
 208         sdata->vif.bss_conf.use_cts_prot = false;
 209         sdata->vif.bss_conf.use_short_preamble = false;
 210         sdata->vif.bss_conf.use_short_slot = false;
 211         return BSS_CHANGED_ERP_CTS_PROT |
 212                BSS_CHANGED_ERP_PREAMBLE |
 213                BSS_CHANGED_ERP_SLOT;
 214 }
 215
 216 static void ieee80211_tasklet_handler(unsigned long data)
 217 {
 218         struct ieee80211_local *local = (struct ieee80211_local *) data;
 219         struct sk_buff *skb;
 220
 221         while ((skb = skb_dequeue(&local->skb_queue)) ||
 222                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 223                 switch (skb->pkt_type) {
 224                 case IEEE80211_RX_MSG:
 225                         /* Clear skb->pkt_type in order to not confuse kernel
 226                          * netstack. */
 227                         skb->pkt_type = 0;
 228                         ieee80211_rx(&local->hw, skb);
 229                         break;
 230                 case IEEE80211_TX_STATUS_MSG:
 231                         skb->pkt_type = 0;
 232                         ieee80211_tx_status(&local->hw, skb);
 233                         break;
 234                 default:
 235                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 236                              skb->pkt_type);
 237                         dev_kfree_skb(skb);
 238                         break;
 239                 }
 240         }
 241 }
 242
 243 static void ieee80211_restart_work(struct work_struct *work)
 244 {
 245         struct ieee80211_local *local =
 246                 container_of(work, struct ieee80211_local, restart_work);
 247         struct ieee80211_sub_if_data *sdata;
 248
 249         /* wait for scan work complete */
 250         flush_workqueue(local->workqueue);
 251
 252         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 253              "%s called with hardware scan in progress\n", __func__);
 254
 255         rtnl_lock();
 256         list_for_each_entry(sdata, &local->interfaces, list)
 257                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 258         ieee80211_scan_cancel(local);
 259         ieee80211_reconfig(local);
 260         rtnl_unlock();
 261 }
 262
 263 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 264 {
 265         struct ieee80211_local *local = hw_to_local(hw);
 266
 267         trace_api_restart_hw(local);
 268
 269         wiphy_info(hw->wiphy,
 270                    "Hardware restart was requested\n");
 271
 272         /* use this reason, ieee80211_reconfig will unblock it */
 273         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 274                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 275                                         false);
 276
 277         /*
 278          * Stop all Rx during the reconfig. We don't want state changes
 279          * or driver callbacks while this is in progress.
 280          */
 281         local->in_reconfig = true;
 282         barrier();
 283
 284         queue_work(system_freezable_wq, &local->restart_work);
 285 }
 286 EXPORT_SYMBOL(ieee80211_restart_hw);
 287
 288 #ifdef CONFIG_INET
 289 static int ieee80211_ifa_changed(struct notifier_block *nb,
 290                                  unsigned long data, void *arg)
 291 {
 292         struct in_ifaddr *ifa = arg;
 293         struct ieee80211_local *local =
 294                 container_of(nb, struct ieee80211_local,
 295                              ifa_notifier);
 296         struct net_device *ndev = ifa->ifa_dev->dev;
 297         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 298         struct in_device *idev;
 299         struct ieee80211_sub_if_data *sdata;
 300         struct ieee80211_bss_conf *bss_conf;
 301         struct ieee80211_if_managed *ifmgd;
 302         int c = 0;
 303
 304         /* Make sure it's our interface that got changed */
 305         if (!wdev)
 306                 return NOTIFY_DONE;
 307
 308         if (wdev->wiphy != local->hw.wiphy)
 309                 return NOTIFY_DONE;
 310
 311         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 312         bss_conf = &sdata->vif.bss_conf;
 313
 314         /* ARP filtering is only supported in managed mode */
 315         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 316                 return NOTIFY_DONE;
 317
 318         idev = __in_dev_get_rtnl(sdata->dev);
 319         if (!idev)
 320                 return NOTIFY_DONE;
 321
 322         ifmgd = &sdata->u.mgd;
 323         sdata_lock(sdata);
 324
 325         /* Copy the addresses to the bss_conf list */
 326         ifa = idev->ifa_list;
 327         while (ifa) {
 328                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 329                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 330                 ifa = ifa->ifa_next;
 331                 c++;
 332         }
 333
 334         bss_conf->arp_addr_cnt = c;
 335
 336         /* Configure driver only if associated (which also implies it is up) */
 337         if (ifmgd->associated)
 338                 ieee80211_bss_info_change_notify(sdata,
 339                                                  BSS_CHANGED_ARP_FILTER);
 340
 341         sdata_unlock(sdata);
 342
 343         return NOTIFY_OK;
 344 }
 345 #endif
 346
 347 #if IS_ENABLED(CONFIG_IPV6)
 348 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 349                                   unsigned long data, void *arg)
 350 {
 351         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 352         struct inet6_dev *idev = ifa->idev;
 353         struct net_device *ndev = ifa->idev->dev;
 354         struct ieee80211_local *local =
 355                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 356         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 357         struct ieee80211_sub_if_data *sdata;
 358
 359         /* Make sure it's our interface that got changed */
 360         if (!wdev || wdev->wiphy != local->hw.wiphy)
 361                 return NOTIFY_DONE;
 362
 363         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 364
 365         /*
 366          * For now only support station mode. This is mostly because
 367          * doing AP would have to handle AP_VLAN in some way ...
 368          */
 369         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 370                 return NOTIFY_DONE;
 371
 372         drv_ipv6_addr_change(local, sdata, idev);
 373
 374         return NOTIFY_OK;
 375 }
 376 #endif
 377
 378 /* There isn't a lot of sense in it, but you can transmit anything you like */
 379 static const struct ieee80211_txrx_stypes
 380 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 381         [NL80211_IFTYPE_ADHOC] = {
 382                 .tx = 0xffff,
 383                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 384                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 385                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 386                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 387         },
 388         [NL80211_IFTYPE_STATION] = {
 389                 .tx = 0xffff,
 390                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 391                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 392         },
 393         [NL80211_IFTYPE_AP] = {
 394                 .tx = 0xffff,
 395                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 396                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 398                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 399                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 400                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 401                         BIT(IEEE80211_STYPE_ACTION >> 4),
 402         },
 403         [NL80211_IFTYPE_AP_VLAN] = {
 404                 /* copy 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_P2P_CLIENT] = {
 415                 .tx = 0xffff,
 416                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 417                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 418         },
 419         [NL80211_IFTYPE_P2P_GO] = {
 420                 .tx = 0xffff,
 421                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 422                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 423                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 424                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 425                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 426                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 427                         BIT(IEEE80211_STYPE_ACTION >> 4),
 428         },
 429         [NL80211_IFTYPE_MESH_POINT] = {
 430                 .tx = 0xffff,
 431                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 432                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 433                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 434         },
 435         [NL80211_IFTYPE_P2P_DEVICE] = {
 436                 .tx = 0xffff,
 437                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 438                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 439         },
 440 };
 441
 442 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 443         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 444                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 445
 446         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 447                                 IEEE80211_HT_CAP_MAX_AMSDU |
 448                                 IEEE80211_HT_CAP_SGI_20 |
 449                                 IEEE80211_HT_CAP_SGI_40 |
 450                                 IEEE80211_HT_CAP_LDPC_CODING |
 451                                 IEEE80211_HT_CAP_40MHZ_INTOLERANT),
 452         .mcs = {
 453                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 454                              0xff, 0xff, 0xff, 0xff, 0xff, },
 455         },
 456 };
 457
 458 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 459         .vht_cap_info =
 460                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 461                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 462                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 463                             IEEE80211_VHT_CAP_RXSTBC_1 |
 464                             IEEE80211_VHT_CAP_RXSTBC_2 |
 465                             IEEE80211_VHT_CAP_RXSTBC_3 |
 466                             IEEE80211_VHT_CAP_RXSTBC_4 |
 467                             IEEE80211_VHT_CAP_TXSTBC |
 468                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 469                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 470                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 471                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 472                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 473         .supp_mcs = {
 474                 .rx_mcs_map = cpu_to_le16(~0),
 475                 .tx_mcs_map = cpu_to_le16(~0),
 476         },
 477 };
 478
 479 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 480                                            const struct ieee80211_ops *ops,
 481                                            const char *requested_name)
 482 {
 483         struct ieee80211_local *local;
 484         int priv_size, i;
 485         struct wiphy *wiphy;
 486         bool use_chanctx;
 487
 488         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 489                     !ops->add_interface || !ops->remove_interface ||
 490                     !ops->configure_filter))
 491                 return NULL;
 492
 493         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 494                 return NULL;
 495
 496         /* check all or no channel context operations exist */
 497         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 498             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 499             !!ops->unassign_vif_chanctx;
 500         if (WARN_ON(i != 0 && i != 5))
 501                 return NULL;
 502         use_chanctx = i == 5;
 503
 504         /* Ensure 32-byte alignment of our private data and hw private data.
 505          * We use the wiphy priv data for both our ieee80211_local and for
 506          * the driver's private data
 507          *
 508          * In memory it'll be like this:
 509          *
 510          * +-------------------------+
 511          * | struct wiphy           |
 512          * +-------------------------+
 513          * | struct ieee80211_local  |
 514          * +-------------------------+
 515          * | driver's private data   |
 516          * +-------------------------+
 517          *
 518          */
 519         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 520
 521         wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);
 522
 523         if (!wiphy)
 524                 return NULL;
 525
 526         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 527
 528         wiphy->privid = mac80211_wiphy_privid;
 529
 530         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 531                         WIPHY_FLAG_4ADDR_AP |
 532                         WIPHY_FLAG_4ADDR_STATION |
 533                         WIPHY_FLAG_REPORTS_OBSS |
 534                         WIPHY_FLAG_OFFCHAN_TX;
 535
 536         if (ops->remain_on_channel)
 537                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 538
 539         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 540                            NL80211_FEATURE_SAE |
 541                            NL80211_FEATURE_HT_IBSS |
 542                            NL80211_FEATURE_VIF_TXPOWER |
 543                            NL80211_FEATURE_MAC_ON_CREATE |
 544                            NL80211_FEATURE_USERSPACE_MPM |
 545                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 546
 547         if (!ops->hw_scan)
 548                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 549                                    NL80211_FEATURE_AP_SCAN;
 550
 551
 552         if (!ops->set_key)
 553                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 554
 555         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 556
 557         local = wiphy_priv(wiphy);
 558
 559         if (sta_info_init(local))
 560                 goto err_free;
 561
 562         local->hw.wiphy = wiphy;
 563
 564         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 565
 566         local->ops = ops;
 567         local->use_chanctx = use_chanctx;
 568
 569         /* set up some defaults */
 570         local->hw.queues = 1;
 571         local->hw.max_rates = 1;
 572         local->hw.max_report_rates = 0;
 573         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 574         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 575         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 576         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 577         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 578         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 579                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 580                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 581         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 582                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 583         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 584         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 585         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 586         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 587         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 588
 589         local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
 590
 591         wiphy->extended_capabilities = local->ext_capa;
 592         wiphy->extended_capabilities_mask = local->ext_capa;
 593         wiphy->extended_capabilities_len =
 594                 ARRAY_SIZE(local->ext_capa);
 595
 596         INIT_LIST_HEAD(&local->interfaces);
 597
 598         __hw_addr_init(&local->mc_list);
 599
 600         mutex_init(&local->iflist_mtx);
 601         mutex_init(&local->mtx);
 602
 603         mutex_init(&local->key_mtx);
 604         spin_lock_init(&local->filter_lock);
 605         spin_lock_init(&local->rx_path_lock);
 606         spin_lock_init(&local->queue_stop_reason_lock);
 607
 608         INIT_LIST_HEAD(&local->chanctx_list);
 609         mutex_init(&local->chanctx_mtx);
 610
 611         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 612
 613         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 614
 615         INIT_WORK(&local->radar_detected_work,
 616                   ieee80211_dfs_radar_detected_work);
 617
 618         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 619         local->smps_mode = IEEE80211_SMPS_OFF;
 620
 621         INIT_WORK(&local->dynamic_ps_enable_work,
 622                   ieee80211_dynamic_ps_enable_work);
 623         INIT_WORK(&local->dynamic_ps_disable_work,
 624                   ieee80211_dynamic_ps_disable_work);
 625         setup_timer(&local->dynamic_ps_timer,
 626                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 627
 628         INIT_WORK(&local->sched_scan_stopped_work,
 629                   ieee80211_sched_scan_stopped_work);
 630
 631         INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
 632
 633         spin_lock_init(&local->ack_status_lock);
 634         idr_init(&local->ack_status_frames);
 635
 636         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 637                 skb_queue_head_init(&local->pending[i]);
 638                 atomic_set(&local->agg_queue_stop[i], 0);
 639         }
 640         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 641                      (unsigned long)local);
 642
 643         tasklet_init(&local->tasklet,
 644                      ieee80211_tasklet_handler,
 645                      (unsigned long) local);
 646
 647         skb_queue_head_init(&local->skb_queue);
 648         skb_queue_head_init(&local->skb_queue_unreliable);
 649         skb_queue_head_init(&local->skb_queue_tdls_chsw);
 650
 651         ieee80211_alloc_led_names(local);
 652
 653         ieee80211_roc_setup(local);
 654
 655         return &local->hw;
 656  err_free:
 657         wiphy_free(wiphy);
 658         return NULL;
 659 }
 660 EXPORT_SYMBOL(ieee80211_alloc_hw_nm);
 661
 662 static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
 663 {
 664         bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
 665                           IS_ERR(local->wep_rx_tfm));
 666         bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);
 667         int n_suites = 0, r = 0, w = 0;
 668         u32 *suites;
 669         static const u32 cipher_suites[] = {
 670                 /* keep WEP first, it may be removed below */
 671                 WLAN_CIPHER_SUITE_WEP40,
 672                 WLAN_CIPHER_SUITE_WEP104,
 673                 WLAN_CIPHER_SUITE_TKIP,
 674                 WLAN_CIPHER_SUITE_CCMP,
 675                 WLAN_CIPHER_SUITE_CCMP_256,
 676                 WLAN_CIPHER_SUITE_GCMP,
 677                 WLAN_CIPHER_SUITE_GCMP_256,
 678
 679                 /* keep last -- depends on hw flags! */
 680                 WLAN_CIPHER_SUITE_AES_CMAC,
 681                 WLAN_CIPHER_SUITE_BIP_CMAC_256,
 682                 WLAN_CIPHER_SUITE_BIP_GMAC_128,
 683                 WLAN_CIPHER_SUITE_BIP_GMAC_256,
 684         };
 685
 686         if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||
 687             local->hw.wiphy->cipher_suites) {
 688                 /* If the driver advertises, or doesn't support SW crypto,
 689                  * we only need to remove WEP if necessary.
 690                  */
 691                 if (have_wep)
 692                         return 0;
 693
 694                 /* well if it has _no_ ciphers ... fine */
 695                 if (!local->hw.wiphy->n_cipher_suites)
 696                         return 0;
 697
 698                 /* Driver provides cipher suites, but we need to exclude WEP */
 699                 suites = kmemdup(local->hw.wiphy->cipher_suites,
 700                                  sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 701                                  GFP_KERNEL);
 702                 if (!suites)
 703                         return -ENOMEM;
 704
 705                 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 706                         u32 suite = local->hw.wiphy->cipher_suites[r];
 707
 708                         if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 709                             suite == WLAN_CIPHER_SUITE_WEP104)
 710                                 continue;
 711                         suites[w++] = suite;
 712                 }
 713         } else if (!local->hw.cipher_schemes) {
 714                 /* If the driver doesn't have cipher schemes, there's nothing
 715                  * else to do other than assign the (software supported and
 716                  * perhaps offloaded) cipher suites.
 717                  */
 718                 local->hw.wiphy->cipher_suites = cipher_suites;
 719                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 720
 721                 if (!have_mfp)
 722                         local->hw.wiphy->n_cipher_suites -= 4;
 723
 724                 if (!have_wep) {
 725                         local->hw.wiphy->cipher_suites += 2;
 726                         local->hw.wiphy->n_cipher_suites -= 2;
 727                 }
 728
 729                 /* not dynamically allocated, so just return */
 730                 return 0;
 731         } else {
 732                 const struct ieee80211_cipher_scheme *cs;
 733
 734                 cs = local->hw.cipher_schemes;
 735
 736                 /* Driver specifies cipher schemes only (but not cipher suites
 737                  * including the schemes)
 738                  *
 739                  * We start counting ciphers defined by schemes, TKIP, CCMP,
 740                  * CCMP-256, GCMP, and GCMP-256
 741                  */
 742                 n_suites = local->hw.n_cipher_schemes + 5;
 743
 744                 /* check if we have WEP40 and WEP104 */
 745                 if (have_wep)
 746                         n_suites += 2;
 747
 748                 /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
 749                  * BIP-GMAC-256
 750                  */
 751                 if (have_mfp)
 752                         n_suites += 4;
 753
 754                 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
 755                 if (!suites)
 756                         return -ENOMEM;
 757
 758                 suites[w++] = WLAN_CIPHER_SUITE_CCMP;
 759                 suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;
 760                 suites[w++] = WLAN_CIPHER_SUITE_TKIP;
 761                 suites[w++] = WLAN_CIPHER_SUITE_GCMP;
 762                 suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;
 763
 764                 if (have_wep) {
 765                         suites[w++] = WLAN_CIPHER_SUITE_WEP40;
 766                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
 767                 }
 768
 769                 if (have_mfp) {
 770                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
 771                         suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
 772                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
 773                         suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;
 774                 }
 775
 776                 for (r = 0; r < local->hw.n_cipher_schemes; r++) {
 777                         suites[w++] = cs[r].cipher;
 778                         if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
 779                                 kfree(suites);
 780                                 return -EINVAL;
 781                         }
 782                 }
 783         }
 784
 785         local->hw.wiphy->cipher_suites = suites;
 786         local->hw.wiphy->n_cipher_suites = w;
 787         local->wiphy_ciphers_allocated = true;
 788
 789         return 0;
 790 }
 791
 792 int ieee80211_register_hw(struct ieee80211_hw *hw)
 793 {
 794         struct ieee80211_local *local = hw_to_local(hw);
 795         int result, i;
 796         enum ieee80211_band band;
 797         int channels, max_bitrates;
 798         bool supp_ht, supp_vht;
 799         netdev_features_t feature_whitelist;
 800         struct cfg80211_chan_def dflt_chandef = {};
 801
 802         if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&
 803             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 804              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 805                 return -EINVAL;
 806
 807         if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 808             (!local->ops->tdls_channel_switch ||
 809              !local->ops->tdls_cancel_channel_switch ||
 810              !local->ops->tdls_recv_channel_switch))
 811                 return -EOPNOTSUPP;
 812
 813 #ifdef CONFIG_PM
 814         if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
 815                 return -EINVAL;
 816 #endif
 817
 818         if (!local->use_chanctx) {
 819                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 820                         const struct ieee80211_iface_combination *comb;
 821
 822                         comb = &local->hw.wiphy->iface_combinations[i];
 823
 824                         if (comb->num_different_channels > 1)
 825                                 return -EINVAL;
 826                 }
 827         } else {
 828                 /*
 829                  * WDS is currently prohibited when channel contexts are used
 830                  * because there's no clear definition of which channel WDS
 831                  * type interfaces use
 832                  */
 833                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 834                         return -EINVAL;
 835
 836                 /* DFS is not supported with multi-channel combinations yet */
 837                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 838                         const struct ieee80211_iface_combination *comb;
 839
 840                         comb = &local->hw.wiphy->iface_combinations[i];
 841
 842                         if (comb->radar_detect_widths &&
 843                             comb->num_different_channels > 1)
 844                                 return -EINVAL;
 845                 }
 846         }
 847
 848         /* Only HW csum features are currently compatible with mac80211 */
 849         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 850                             NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
 851                             NETIF_F_GSO_SOFTWARE;
 852         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 853                 return -EINVAL;
 854
 855         if (hw->max_report_rates == 0)
 856                 hw->max_report_rates = hw->max_rates;
 857
 858         local->rx_chains = 1;
 859
 860         /*
 861          * generic code guarantees at least one band,
 862          * set this very early because much code assumes
 863          * that hw.conf.channel is assigned
 864          */
 865         channels = 0;
 866         max_bitrates = 0;
 867         supp_ht = false;
 868         supp_vht = false;
 869         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 870                 struct ieee80211_supported_band *sband;
 871
 872                 sband = local->hw.wiphy->bands[band];
 873                 if (!sband)
 874                         continue;
 875
 876                 if (!dflt_chandef.chan) {
 877                         cfg80211_chandef_create(&dflt_chandef,
 878                                                 &sband->channels[0],
 879                                                 NL80211_CHAN_NO_HT);
 880                         /* init channel we're on */
 881                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 882                                 local->hw.conf.chandef = dflt_chandef;
 883                                 local->_oper_chandef = dflt_chandef;
 884                         }
 885                         local->monitor_chandef = dflt_chandef;
 886                 }
 887
 888                 channels += sband->n_channels;
 889
 890                 if (max_bitrates < sband->n_bitrates)
 891                         max_bitrates = sband->n_bitrates;
 892                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 893                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 894
 895                 if (sband->ht_cap.ht_supported)
 896                         local->rx_chains =
 897                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 898                                     local->rx_chains);
 899
 900                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 901         }
 902
 903         /* if low-level driver supports AP, we also support VLAN */
 904         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 905                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 906                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 907         }
 908
 909         /* mac80211 always supports monitor */
 910         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 911         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 912
 913         /* mac80211 doesn't support more than one IBSS interface right now */
 914         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 915                 const struct ieee80211_iface_combination *c;
 916                 int j;
 917
 918                 c = &hw->wiphy->iface_combinations[i];
 919
 920                 for (j = 0; j < c->n_limits; j++)
 921                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 922                             c->limits[j].max > 1)
 923                                 return -EINVAL;
 924         }
 925
 926         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 927                                       sizeof(void *) * channels, GFP_KERNEL);
 928         if (!local->int_scan_req)
 929                 return -ENOMEM;
 930
 931         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 932                 if (!local->hw.wiphy->bands[band])
 933                         continue;
 934                 local->int_scan_req->rates[band] = (u32) -1;
 935         }
 936
 937 #ifndef CONFIG_MAC80211_MESH
 938         /* mesh depends on Kconfig, but drivers should set it if they want */
 939         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 940 #endif
 941
 942         /* if the underlying driver supports mesh, mac80211 will (at least)
 943          * provide routing of mesh authentication frames to userspace */
 944         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 945                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 946
 947         /* mac80211 supports control port protocol changing */
 948         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 949
 950         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {
 951                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 952         } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {
 953                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 954                 if (hw->max_signal <= 0) {
 955                         result = -EINVAL;
 956                         goto fail_wiphy_register;
 957                 }
 958         }
 959
 960         /*
 961          * Calculate scan IE length -- we need this to alloc
 962          * memory and to subtract from the driver limit. It
 963          * includes the DS Params, (extended) supported rates, and HT
 964          * information -- SSID is the driver's responsibility.
 965          */
 966         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 967                 3 /* DS Params */;
 968         if (supp_ht)
 969                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 970
 971         if (supp_vht)
 972                 local->scan_ies_len +=
 973                         2 + sizeof(struct ieee80211_vht_cap);
 974
 975         if (!local->ops->hw_scan) {
 976                 /* For hw_scan, driver needs to set these up. */
 977                 local->hw.wiphy->max_scan_ssids = 4;
 978                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 979         }
 980
 981         /*
 982          * If the driver supports any scan IEs, then assume the
 983          * limit includes the IEs mac80211 will add, otherwise
 984          * leave it at zero and let the driver sort it out; we
 985          * still pass our IEs to the driver but userspace will
 986          * not be allowed to in that case.
 987          */
 988         if (local->hw.wiphy->max_scan_ie_len)
 989                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 990
 991         WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
 992                                          local->hw.n_cipher_schemes));
 993
 994         result = ieee80211_init_cipher_suites(local);
 995         if (result < 0)
 996                 goto fail_wiphy_register;
 997
 998         if (!local->ops->remain_on_channel)
 999                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
1000
1001         /* mac80211 based drivers don't support internal TDLS setup */
1002         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
1003                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
1004
1005         /* mac80211 supports eCSA, if the driver supports STA CSA at all */
1006         if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
1007                 local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
1008
1009         local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
1010
1011         result = wiphy_register(local->hw.wiphy);
1012         if (result < 0)
1013                 goto fail_wiphy_register;
1014
1015         /*
1016          * We use the number of queues for feature tests (QoS, HT) internally
1017          * so restrict them appropriately.
1018          */
1019         if (hw->queues > IEEE80211_MAX_QUEUES)
1020                 hw->queues = IEEE80211_MAX_QUEUES;
1021
1022         local->workqueue =
1023                 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));
1024         if (!local->workqueue) {
1025                 result = -ENOMEM;
1026                 goto fail_workqueue;
1027         }
1028
1029         /*
1030          * The hardware needs headroom for sending the frame,
1031          * and we need some headroom for passing the frame to monitor
1032          * interfaces, but never both at the same time.
1033          */
1034         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1035                                    IEEE80211_TX_STATUS_HEADROOM);
1036
1037         debugfs_hw_add(local);
1038
1039         /*
1040          * if the driver doesn't specify a max listen interval we
1041          * use 5 which should be a safe default
1042          */
1043         if (local->hw.max_listen_interval == 0)
1044                 local->hw.max_listen_interval = 5;
1045
1046         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1047
1048         local->dynamic_ps_forced_timeout = -1;
1049
1050         if (!local->hw.txq_ac_max_pending)
1051                 local->hw.txq_ac_max_pending = 64;
1052
1053         result = ieee80211_wep_init(local);
1054         if (result < 0)
1055                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1056                             result);
1057
1058         local->hw.conf.flags = IEEE80211_CONF_IDLE;
1059
1060         ieee80211_led_init(local);
1061
1062         rtnl_lock();
1063
1064         result = ieee80211_init_rate_ctrl_alg(local,
1065                                               hw->rate_control_algorithm);
1066         if (result < 0) {
1067                 wiphy_debug(local->hw.wiphy,
1068                             "Failed to initialize rate control algorithm\n");
1069                 goto fail_rate;
1070         }
1071
1072         /* add one default STA interface if supported */
1073         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&
1074             !ieee80211_hw_check(hw, NO_AUTO_VIF)) {
1075                 result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,
1076                                           NL80211_IFTYPE_STATION, NULL);
1077                 if (result)
1078                         wiphy_warn(local->hw.wiphy,
1079                                    "Failed to add default virtual iface\n");
1080         }
1081
1082         rtnl_unlock();
1083
1084 #ifdef CONFIG_INET
1085         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1086         result = register_inetaddr_notifier(&local->ifa_notifier);
1087         if (result)
1088                 goto fail_ifa;
1089 #endif
1090
1091 #if IS_ENABLED(CONFIG_IPV6)
1092         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1093         result = register_inet6addr_notifier(&local->ifa6_notifier);
1094         if (result)
1095                 goto fail_ifa6;
1096 #endif
1097
1098         return 0;
1099
1100 #if IS_ENABLED(CONFIG_IPV6)
1101  fail_ifa6:
1102 #ifdef CONFIG_INET
1103         unregister_inetaddr_notifier(&local->ifa_notifier);
1104 #endif
1105 #endif
1106 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1107  fail_ifa:
1108 #endif
1109         rtnl_lock();
1110         rate_control_deinitialize(local);
1111         ieee80211_remove_interfaces(local);
1112  fail_rate:
1113         rtnl_unlock();
1114         ieee80211_led_exit(local);
1115         ieee80211_wep_free(local);
1116         destroy_workqueue(local->workqueue);
1117  fail_workqueue:
1118         wiphy_unregister(local->hw.wiphy);
1119  fail_wiphy_register:
1120         if (local->wiphy_ciphers_allocated)
1121                 kfree(local->hw.wiphy->cipher_suites);
1122         kfree(local->int_scan_req);
1123         return result;
1124 }
1125 EXPORT_SYMBOL(ieee80211_register_hw);
1126
1127 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1128 {
1129         struct ieee80211_local *local = hw_to_local(hw);
1130
1131         tasklet_kill(&local->tx_pending_tasklet);
1132         tasklet_kill(&local->tasklet);
1133
1134 #ifdef CONFIG_INET
1135         unregister_inetaddr_notifier(&local->ifa_notifier);
1136 #endif
1137 #if IS_ENABLED(CONFIG_IPV6)
1138         unregister_inet6addr_notifier(&local->ifa6_notifier);
1139 #endif
1140
1141         rtnl_lock();
1142
1143         /*
1144          * At this point, interface list manipulations are fine
1145          * because the driver cannot be handing us frames any
1146          * more and the tasklet is killed.
1147          */
1148         ieee80211_remove_interfaces(local);
1149
1150         rtnl_unlock();
1151
1152         cancel_work_sync(&local->restart_work);
1153         cancel_work_sync(&local->reconfig_filter);
1154         cancel_work_sync(&local->tdls_chsw_work);
1155         flush_work(&local->sched_scan_stopped_work);
1156
1157         ieee80211_clear_tx_pending(local);
1158         rate_control_deinitialize(local);
1159
1160         if (skb_queue_len(&local->skb_queue) ||
1161             skb_queue_len(&local->skb_queue_unreliable))
1162                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1163         skb_queue_purge(&local->skb_queue);
1164         skb_queue_purge(&local->skb_queue_unreliable);
1165         skb_queue_purge(&local->skb_queue_tdls_chsw);
1166
1167         destroy_workqueue(local->workqueue);
1168         wiphy_unregister(local->hw.wiphy);
1169         ieee80211_wep_free(local);
1170         ieee80211_led_exit(local);
1171         kfree(local->int_scan_req);
1172 }
1173 EXPORT_SYMBOL(ieee80211_unregister_hw);
1174
1175 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1176 {
1177         WARN_ONCE(1, "Have pending ack frames!\n");
1178         kfree_skb(p);
1179         return 0;
1180 }
1181
1182 void ieee80211_free_hw(struct ieee80211_hw *hw)
1183 {
1184         struct ieee80211_local *local = hw_to_local(hw);
1185
1186         mutex_destroy(&local->iflist_mtx);
1187         mutex_destroy(&local->mtx);
1188
1189         if (local->wiphy_ciphers_allocated)
1190                 kfree(local->hw.wiphy->cipher_suites);
1191
1192         idr_for_each(&local->ack_status_frames,
1193                      ieee80211_free_ack_frame, NULL);
1194         idr_destroy(&local->ack_status_frames);
1195
1196         sta_info_stop(local);
1197
1198         ieee80211_free_led_names(local);
1199
1200         wiphy_free(local->hw.wiphy);
1201 }
1202 EXPORT_SYMBOL(ieee80211_free_hw);
1203
1204 static int __init ieee80211_init(void)
1205 {
1206         struct sk_buff *skb;
1207         int ret;
1208
1209         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1210         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1211                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1212
1213         ret = rc80211_minstrel_init();
1214         if (ret)
1215                 return ret;
1216
1217         ret = rc80211_minstrel_ht_init();
1218         if (ret)
1219                 goto err_minstrel;
1220
1221         ret = ieee80211_iface_init();
1222         if (ret)
1223                 goto err_netdev;
1224
1225         return 0;
1226  err_netdev:
1227         rc80211_minstrel_ht_exit();
1228  err_minstrel:
1229         rc80211_minstrel_exit();
1230
1231         return ret;
1232 }
1233
1234 static void __exit ieee80211_exit(void)
1235 {
1236         rc80211_minstrel_ht_exit();
1237         rc80211_minstrel_exit();
1238
1239         ieee80211s_stop();
1240
1241         ieee80211_iface_exit();
1242
1243         rcu_barrier();
1244 }
1245
1246
1247 subsys_initcall(ieee80211_init);
1248 module_exit(ieee80211_exit);
1249
1250 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1251 MODULE_LICENSE("GPL");