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  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35
  36 static struct lock_class_key ieee80211_rx_skb_queue_class;
  37
  38 void ieee80211_configure_filter(struct ieee80211_local *local)
  39 {
  40         u64 mc;
  41         unsigned int changed_flags;
  42         unsigned int new_flags = 0;
  43
  44         if (atomic_read(&local->iff_promiscs))
  45                 new_flags |= FIF_PROMISC_IN_BSS;
  46
  47         if (atomic_read(&local->iff_allmultis))
  48                 new_flags |= FIF_ALLMULTI;
  49
  50         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  51             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  52                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  53
  54         if (local->fif_probe_req || local->probe_req_reg)
  55                 new_flags |= FIF_PROBE_REQ;
  56
  57         if (local->fif_fcsfail)
  58                 new_flags |= FIF_FCSFAIL;
  59
  60         if (local->fif_plcpfail)
  61                 new_flags |= FIF_PLCPFAIL;
  62
  63         if (local->fif_control)
  64                 new_flags |= FIF_CONTROL;
  65
  66         if (local->fif_other_bss)
  67                 new_flags |= FIF_OTHER_BSS;
  68
  69         if (local->fif_pspoll)
  70                 new_flags |= FIF_PSPOLL;
  71
  72         spin_lock_bh(&local->filter_lock);
  73         changed_flags = local->filter_flags ^ new_flags;
  74
  75         mc = drv_prepare_multicast(local, &local->mc_list);
  76         spin_unlock_bh(&local->filter_lock);
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         drv_configure_filter(local, changed_flags, &new_flags, mc);
  82
  83         WARN_ON(new_flags & (1<<31));
  84
  85         local->filter_flags = new_flags & ~(1<<31);
  86 }
  87
  88 static void ieee80211_reconfig_filter(struct work_struct *work)
  89 {
  90         struct ieee80211_local *local =
  91                 container_of(work, struct ieee80211_local, reconfig_filter);
  92
  93         ieee80211_configure_filter(local);
  94 }
  95
  96 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  97 {
  98         struct ieee80211_sub_if_data *sdata;
  99         struct ieee80211_channel *chan;
 100         u32 changed = 0;
 101         int power;
 102         enum nl80211_channel_type channel_type;
 103         u32 offchannel_flag;
 104         bool scanning = false;
 105
 106         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 107         if (local->scan_channel) {
 108                 chan = local->scan_channel;
 109                 /* If scanning on oper channel, use whatever channel-type
 110                  * is currently in use.
 111                  */
 112                 if (chan == local->_oper_channel)
 113                         channel_type = local->_oper_channel_type;
 114                 else
 115                         channel_type = NL80211_CHAN_NO_HT;
 116         } else if (local->tmp_channel) {
 117                 chan = local->tmp_channel;
 118                 channel_type = NL80211_CHAN_NO_HT;
 119         } else {
 120                 chan = local->_oper_channel;
 121                 channel_type = local->_oper_channel_type;
 122         }
 123
 124         if (chan != local->_oper_channel ||
 125             channel_type != local->_oper_channel_type)
 126                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 127         else
 128                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 129
 130         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 131
 132         if (offchannel_flag || chan != local->hw.conf.channel ||
 133             channel_type != local->hw.conf.channel_type) {
 134                 local->hw.conf.channel = chan;
 135                 local->hw.conf.channel_type = channel_type;
 136                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 137         }
 138
 139         if (!conf_is_ht(&local->hw.conf)) {
 140                 /*
 141                  * mac80211.h documents that this is only valid
 142                  * when the channel is set to an HT type, and
 143                  * that otherwise STATIC is used.
 144                  */
 145                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 146         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 147                 local->hw.conf.smps_mode = local->smps_mode;
 148                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 149         }
 150
 151         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 152                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 153                    test_bit(SCAN_HW_SCANNING, &local->scanning);
 154         power = chan->max_power;
 155
 156         rcu_read_lock();
 157         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 158                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 159                         continue;
 160                 power = min(power, sdata->vif.bss_conf.txpower);
 161         }
 162         rcu_read_unlock();
 163
 164         if (local->hw.conf.power_level != power) {
 165                 changed |= IEEE80211_CONF_CHANGE_POWER;
 166                 local->hw.conf.power_level = power;
 167         }
 168
 169         return changed;
 170 }
 171
 172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 173 {
 174         int ret = 0;
 175
 176         might_sleep();
 177
 178         if (!local->use_chanctx)
 179                 changed |= ieee80211_hw_conf_chan(local);
 180         else
 181                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 182                              IEEE80211_CONF_CHANGE_POWER);
 183
 184         if (changed && local->open_count) {
 185                 ret = drv_config(local, changed);
 186                 /*
 187                  * Goal:
 188                  * HW reconfiguration should never fail, the driver has told
 189                  * us what it can support so it should live up to that promise.
 190                  *
 191                  * Current status:
 192                  * rfkill is not integrated with mac80211 and a
 193                  * configuration command can thus fail if hardware rfkill
 194                  * is enabled
 195                  *
 196                  * FIXME: integrate rfkill with mac80211 and then add this
 197                  * WARN_ON() back
 198                  *
 199                  */
 200                 /* WARN_ON(ret); */
 201         }
 202
 203         return ret;
 204 }
 205
 206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 207                                       u32 changed)
 208 {
 209         struct ieee80211_local *local = sdata->local;
 210         static const u8 zero[ETH_ALEN] = { 0 };
 211
 212         if (!changed)
 213                 return;
 214
 215         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 216                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 217         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 218                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 219         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 220                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 221         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 222                 sdata->vif.bss_conf.bssid = NULL;
 223         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 224                 sdata->vif.bss_conf.bssid = zero;
 225         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 226                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 227                 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
 228                           "P2P Device BSS changed %#x", changed);
 229         } else {
 230                 WARN_ON(1);
 231                 return;
 232         }
 233
 234         switch (sdata->vif.type) {
 235         case NL80211_IFTYPE_AP:
 236         case NL80211_IFTYPE_ADHOC:
 237         case NL80211_IFTYPE_WDS:
 238         case NL80211_IFTYPE_MESH_POINT:
 239                 break;
 240         default:
 241                 /* do not warn to simplify caller in scan.c */
 242                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 243                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 244                         return;
 245                 break;
 246         }
 247
 248         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 249                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 250                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 251                         sdata->vif.bss_conf.enable_beacon = false;
 252                 } else {
 253                         /*
 254                          * Beacon should be enabled, but AP mode must
 255                          * check whether there is a beacon configured.
 256                          */
 257                         switch (sdata->vif.type) {
 258                         case NL80211_IFTYPE_AP:
 259                                 sdata->vif.bss_conf.enable_beacon =
 260                                         !!sdata->u.ap.beacon;
 261                                 break;
 262                         case NL80211_IFTYPE_ADHOC:
 263                                 sdata->vif.bss_conf.enable_beacon =
 264                                         !!sdata->u.ibss.presp;
 265                                 break;
 266 #ifdef CONFIG_MAC80211_MESH
 267                         case NL80211_IFTYPE_MESH_POINT:
 268                                 sdata->vif.bss_conf.enable_beacon =
 269                                         !!sdata->u.mesh.mesh_id_len;
 270                                 break;
 271 #endif
 272                         default:
 273                                 /* not reached */
 274                                 WARN_ON(1);
 275                                 break;
 276                         }
 277                 }
 278         }
 279
 280         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 281 }
 282
 283 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 284 {
 285         sdata->vif.bss_conf.use_cts_prot = false;
 286         sdata->vif.bss_conf.use_short_preamble = false;
 287         sdata->vif.bss_conf.use_short_slot = false;
 288         return BSS_CHANGED_ERP_CTS_PROT |
 289                BSS_CHANGED_ERP_PREAMBLE |
 290                BSS_CHANGED_ERP_SLOT;
 291 }
 292
 293 static void ieee80211_tasklet_handler(unsigned long data)
 294 {
 295         struct ieee80211_local *local = (struct ieee80211_local *) data;
 296         struct sta_info *sta, *tmp;
 297         struct skb_eosp_msg_data *eosp_data;
 298         struct sk_buff *skb;
 299
 300         while ((skb = skb_dequeue(&local->skb_queue)) ||
 301                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 302                 switch (skb->pkt_type) {
 303                 case IEEE80211_RX_MSG:
 304                         /* Clear skb->pkt_type in order to not confuse kernel
 305                          * netstack. */
 306                         skb->pkt_type = 0;
 307                         ieee80211_rx(&local->hw, skb);
 308                         break;
 309                 case IEEE80211_TX_STATUS_MSG:
 310                         skb->pkt_type = 0;
 311                         ieee80211_tx_status(&local->hw, skb);
 312                         break;
 313                 case IEEE80211_EOSP_MSG:
 314                         eosp_data = (void *)skb->cb;
 315                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 316                                 /* skip wrong virtual interface */
 317                                 if (memcmp(eosp_data->iface,
 318                                            sta->sdata->vif.addr, ETH_ALEN))
 319                                         continue;
 320                                 clear_sta_flag(sta, WLAN_STA_SP);
 321                                 break;
 322                         }
 323                         dev_kfree_skb(skb);
 324                         break;
 325                 default:
 326                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 327                              skb->pkt_type);
 328                         dev_kfree_skb(skb);
 329                         break;
 330                 }
 331         }
 332 }
 333
 334 static void ieee80211_restart_work(struct work_struct *work)
 335 {
 336         struct ieee80211_local *local =
 337                 container_of(work, struct ieee80211_local, restart_work);
 338
 339         /* wait for scan work complete */
 340         flush_workqueue(local->workqueue);
 341
 342         mutex_lock(&local->mtx);
 343         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 344              rcu_dereference_protected(local->sched_scan_sdata,
 345                                        lockdep_is_held(&local->mtx)),
 346                 "%s called with hardware scan in progress\n", __func__);
 347         mutex_unlock(&local->mtx);
 348
 349         rtnl_lock();
 350         ieee80211_scan_cancel(local);
 351         ieee80211_reconfig(local);
 352         rtnl_unlock();
 353 }
 354
 355 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 356 {
 357         struct ieee80211_local *local = hw_to_local(hw);
 358
 359         trace_api_restart_hw(local);
 360
 361         wiphy_info(hw->wiphy,
 362                    "Hardware restart was requested\n");
 363
 364         /* use this reason, ieee80211_reconfig will unblock it */
 365         ieee80211_stop_queues_by_reason(hw,
 366                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 367
 368         /*
 369          * Stop all Rx during the reconfig. We don't want state changes
 370          * or driver callbacks while this is in progress.
 371          */
 372         local->in_reconfig = true;
 373         barrier();
 374
 375         schedule_work(&local->restart_work);
 376 }
 377 EXPORT_SYMBOL(ieee80211_restart_hw);
 378
 379 #ifdef CONFIG_INET
 380 static int ieee80211_ifa_changed(struct notifier_block *nb,
 381                                  unsigned long data, void *arg)
 382 {
 383         struct in_ifaddr *ifa = arg;
 384         struct ieee80211_local *local =
 385                 container_of(nb, struct ieee80211_local,
 386                              ifa_notifier);
 387         struct net_device *ndev = ifa->ifa_dev->dev;
 388         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 389         struct in_device *idev;
 390         struct ieee80211_sub_if_data *sdata;
 391         struct ieee80211_bss_conf *bss_conf;
 392         struct ieee80211_if_managed *ifmgd;
 393         int c = 0;
 394
 395         /* Make sure it's our interface that got changed */
 396         if (!wdev)
 397                 return NOTIFY_DONE;
 398
 399         if (wdev->wiphy != local->hw.wiphy)
 400                 return NOTIFY_DONE;
 401
 402         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 403         bss_conf = &sdata->vif.bss_conf;
 404
 405         /* ARP filtering is only supported in managed mode */
 406         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 407                 return NOTIFY_DONE;
 408
 409         idev = __in_dev_get_rtnl(sdata->dev);
 410         if (!idev)
 411                 return NOTIFY_DONE;
 412
 413         ifmgd = &sdata->u.mgd;
 414         mutex_lock(&ifmgd->mtx);
 415
 416         /* Copy the addresses to the bss_conf list */
 417         ifa = idev->ifa_list;
 418         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 419                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 420                 ifa = ifa->ifa_next;
 421                 c++;
 422         }
 423
 424         /* If not all addresses fit the list, disable filtering */
 425         if (ifa) {
 426                 sdata->arp_filter_state = false;
 427                 c = 0;
 428         } else {
 429                 sdata->arp_filter_state = true;
 430         }
 431         bss_conf->arp_addr_cnt = c;
 432
 433         /* Configure driver only if associated (which also implies it is up) */
 434         if (ifmgd->associated) {
 435                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 436                 ieee80211_bss_info_change_notify(sdata,
 437                                                  BSS_CHANGED_ARP_FILTER);
 438         }
 439
 440         mutex_unlock(&ifmgd->mtx);
 441
 442         return NOTIFY_DONE;
 443 }
 444 #endif
 445
 446 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 447 {
 448         struct ieee80211_local *local =
 449                 container_of(napi, struct ieee80211_local, napi);
 450
 451         return local->ops->napi_poll(&local->hw, budget);
 452 }
 453
 454 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 455 {
 456         struct ieee80211_local *local = hw_to_local(hw);
 457
 458         napi_schedule(&local->napi);
 459 }
 460 EXPORT_SYMBOL(ieee80211_napi_schedule);
 461
 462 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 463 {
 464         struct ieee80211_local *local = hw_to_local(hw);
 465
 466         napi_complete(&local->napi);
 467 }
 468 EXPORT_SYMBOL(ieee80211_napi_complete);
 469
 470 /* There isn't a lot of sense in it, but you can transmit anything you like */
 471 static const struct ieee80211_txrx_stypes
 472 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 473         [NL80211_IFTYPE_ADHOC] = {
 474                 .tx = 0xffff,
 475                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 476                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 477                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 478                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 479         },
 480         [NL80211_IFTYPE_STATION] = {
 481                 .tx = 0xffff,
 482                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 483                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 484         },
 485         [NL80211_IFTYPE_AP] = {
 486                 .tx = 0xffff,
 487                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 488                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 489                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 490                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 491                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 492                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 493                         BIT(IEEE80211_STYPE_ACTION >> 4),
 494         },
 495         [NL80211_IFTYPE_AP_VLAN] = {
 496                 /* copy AP */
 497                 .tx = 0xffff,
 498                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 499                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 500                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 501                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 502                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 503                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 504                         BIT(IEEE80211_STYPE_ACTION >> 4),
 505         },
 506         [NL80211_IFTYPE_P2P_CLIENT] = {
 507                 .tx = 0xffff,
 508                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 509                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 510         },
 511         [NL80211_IFTYPE_P2P_GO] = {
 512                 .tx = 0xffff,
 513                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 514                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 515                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 516                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 517                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 518                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 519                         BIT(IEEE80211_STYPE_ACTION >> 4),
 520         },
 521         [NL80211_IFTYPE_MESH_POINT] = {
 522                 .tx = 0xffff,
 523                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 524                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 525                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 526         },
 527         [NL80211_IFTYPE_P2P_DEVICE] = {
 528                 .tx = 0xffff,
 529                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 530                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 531         },
 532 };
 533
 534 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 535         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 536                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 537
 538         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 539                                 IEEE80211_HT_CAP_MAX_AMSDU |
 540                                 IEEE80211_HT_CAP_SGI_40),
 541         .mcs = {
 542                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 543                              0xff, 0xff, 0xff, 0xff, 0xff, },
 544         },
 545 };
 546
 547 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 548                                         const struct ieee80211_ops *ops)
 549 {
 550         struct ieee80211_local *local;
 551         int priv_size, i;
 552         struct wiphy *wiphy;
 553         bool use_chanctx;
 554
 555         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 556                     !ops->add_interface || !ops->remove_interface ||
 557                     !ops->configure_filter))
 558                 return NULL;
 559
 560         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 561                 return NULL;
 562
 563         /* check all or no channel context operations exist */
 564         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 565             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 566             !!ops->unassign_vif_chanctx;
 567         if (WARN_ON(i != 0 && i != 5))
 568                 return NULL;
 569         use_chanctx = i == 5;
 570
 571         /* Ensure 32-byte alignment of our private data and hw private data.
 572          * We use the wiphy priv data for both our ieee80211_local and for
 573          * the driver's private data
 574          *
 575          * In memory it'll be like this:
 576          *
 577          * +-------------------------+
 578          * | struct wiphy           |
 579          * +-------------------------+
 580          * | struct ieee80211_local  |
 581          * +-------------------------+
 582          * | driver's private data   |
 583          * +-------------------------+
 584          *
 585          */
 586         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 587
 588         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 589
 590         if (!wiphy)
 591                 return NULL;
 592
 593         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 594
 595         wiphy->privid = mac80211_wiphy_privid;
 596
 597         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 598                         WIPHY_FLAG_4ADDR_AP |
 599                         WIPHY_FLAG_4ADDR_STATION |
 600                         WIPHY_FLAG_REPORTS_OBSS |
 601                         WIPHY_FLAG_OFFCHAN_TX;
 602
 603         if (ops->remain_on_channel)
 604                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 605
 606         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 607                            NL80211_FEATURE_SAE |
 608                            NL80211_FEATURE_HT_IBSS |
 609                            NL80211_FEATURE_VIF_TXPOWER;
 610
 611         if (!ops->hw_scan)
 612                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 613                                    NL80211_FEATURE_AP_SCAN;
 614
 615
 616         if (!ops->set_key)
 617                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 618
 619         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 620
 621         local = wiphy_priv(wiphy);
 622
 623         local->hw.wiphy = wiphy;
 624
 625         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 626
 627         local->ops = ops;
 628         local->use_chanctx = use_chanctx;
 629
 630         /* set up some defaults */
 631         local->hw.queues = 1;
 632         local->hw.max_rates = 1;
 633         local->hw.max_report_rates = 0;
 634         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 635         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 636         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 637         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 638         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 639         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 640                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 641                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 642         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 643                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 644         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 645         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 646
 647         INIT_LIST_HEAD(&local->interfaces);
 648
 649         __hw_addr_init(&local->mc_list);
 650
 651         mutex_init(&local->iflist_mtx);
 652         mutex_init(&local->mtx);
 653
 654         mutex_init(&local->key_mtx);
 655         spin_lock_init(&local->filter_lock);
 656         spin_lock_init(&local->queue_stop_reason_lock);
 657
 658         INIT_LIST_HEAD(&local->chanctx_list);
 659         mutex_init(&local->chanctx_mtx);
 660
 661         /*
 662          * The rx_skb_queue is only accessed from tasklets,
 663          * but other SKB queues are used from within IRQ
 664          * context. Therefore, this one needs a different
 665          * locking class so our direct, non-irq-safe use of
 666          * the queue's lock doesn't throw lockdep warnings.
 667          */
 668         skb_queue_head_init_class(&local->rx_skb_queue,
 669                                   &ieee80211_rx_skb_queue_class);
 670
 671         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 672
 673         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 674
 675         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 676         local->smps_mode = IEEE80211_SMPS_OFF;
 677
 678         INIT_WORK(&local->dynamic_ps_enable_work,
 679                   ieee80211_dynamic_ps_enable_work);
 680         INIT_WORK(&local->dynamic_ps_disable_work,
 681                   ieee80211_dynamic_ps_disable_work);
 682         setup_timer(&local->dynamic_ps_timer,
 683                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 684
 685         INIT_WORK(&local->sched_scan_stopped_work,
 686                   ieee80211_sched_scan_stopped_work);
 687
 688         spin_lock_init(&local->ack_status_lock);
 689         idr_init(&local->ack_status_frames);
 690         /* preallocate at least one entry */
 691         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 692
 693         sta_info_init(local);
 694
 695         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 696                 skb_queue_head_init(&local->pending[i]);
 697                 atomic_set(&local->agg_queue_stop[i], 0);
 698         }
 699         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 700                      (unsigned long)local);
 701
 702         tasklet_init(&local->tasklet,
 703                      ieee80211_tasklet_handler,
 704                      (unsigned long) local);
 705
 706         skb_queue_head_init(&local->skb_queue);
 707         skb_queue_head_init(&local->skb_queue_unreliable);
 708
 709         /* init dummy netdev for use w/ NAPI */
 710         init_dummy_netdev(&local->napi_dev);
 711
 712         ieee80211_led_names(local);
 713
 714         ieee80211_roc_setup(local);
 715
 716         return &local->hw;
 717 }
 718 EXPORT_SYMBOL(ieee80211_alloc_hw);
 719
 720 int ieee80211_register_hw(struct ieee80211_hw *hw)
 721 {
 722         struct ieee80211_local *local = hw_to_local(hw);
 723         int result, i;
 724         enum ieee80211_band band;
 725         int channels, max_bitrates;
 726         bool supp_ht, supp_vht;
 727         netdev_features_t feature_whitelist;
 728         static const u32 cipher_suites[] = {
 729                 /* keep WEP first, it may be removed below */
 730                 WLAN_CIPHER_SUITE_WEP40,
 731                 WLAN_CIPHER_SUITE_WEP104,
 732                 WLAN_CIPHER_SUITE_TKIP,
 733                 WLAN_CIPHER_SUITE_CCMP,
 734
 735                 /* keep last -- depends on hw flags! */
 736                 WLAN_CIPHER_SUITE_AES_CMAC
 737         };
 738
 739         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 740             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 741              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 742                 return -EINVAL;
 743
 744 #ifdef CONFIG_PM
 745         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 746             (!local->ops->suspend || !local->ops->resume))
 747                 return -EINVAL;
 748 #endif
 749
 750         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 751                 return -EINVAL;
 752
 753         if (!local->use_chanctx) {
 754                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 755                         const struct ieee80211_iface_combination *comb;
 756
 757                         comb = &local->hw.wiphy->iface_combinations[i];
 758
 759                         if (comb->num_different_channels > 1)
 760                                 return -EINVAL;
 761                 }
 762         } else {
 763                 /*
 764                  * WDS is currently prohibited when channel contexts are used
 765                  * because there's no clear definition of which channel WDS
 766                  * type interfaces use
 767                  */
 768                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 769                         return -EINVAL;
 770         }
 771
 772         /* Only HW csum features are currently compatible with mac80211 */
 773         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 774                             NETIF_F_HW_CSUM;
 775         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 776                 return -EINVAL;
 777
 778         if (hw->max_report_rates == 0)
 779                 hw->max_report_rates = hw->max_rates;
 780
 781         local->rx_chains = 1;
 782
 783         /*
 784          * generic code guarantees at least one band,
 785          * set this very early because much code assumes
 786          * that hw.conf.channel is assigned
 787          */
 788         channels = 0;
 789         max_bitrates = 0;
 790         supp_ht = false;
 791         supp_vht = false;
 792         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 793                 struct ieee80211_supported_band *sband;
 794
 795                 sband = local->hw.wiphy->bands[band];
 796                 if (!sband)
 797                         continue;
 798                 if (!local->use_chanctx && !local->_oper_channel) {
 799                         /* init channel we're on */
 800                         local->hw.conf.channel =
 801                         local->_oper_channel = &sband->channels[0];
 802                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 803                 }
 804                 cfg80211_chandef_create(&local->monitor_chandef,
 805                                         &sband->channels[0],
 806                                         NL80211_CHAN_NO_HT);
 807                 channels += sband->n_channels;
 808
 809                 if (max_bitrates < sband->n_bitrates)
 810                         max_bitrates = sband->n_bitrates;
 811                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 812                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 813
 814                 if (sband->ht_cap.ht_supported)
 815                         local->rx_chains =
 816                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 817                                     local->rx_chains);
 818
 819                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 820         }
 821
 822         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 823                                       sizeof(void *) * channels, GFP_KERNEL);
 824         if (!local->int_scan_req)
 825                 return -ENOMEM;
 826
 827         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 828                 if (!local->hw.wiphy->bands[band])
 829                         continue;
 830                 local->int_scan_req->rates[band] = (u32) -1;
 831         }
 832
 833         /* if low-level driver supports AP, we also support VLAN */
 834         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 835                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 836                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 837         }
 838
 839         /* mac80211 always supports monitor */
 840         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 841         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 842
 843         /* mac80211 doesn't support more than one IBSS interface right now */
 844         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 845                 const struct ieee80211_iface_combination *c;
 846                 int j;
 847
 848                 c = &hw->wiphy->iface_combinations[i];
 849
 850                 for (j = 0; j < c->n_limits; j++)
 851                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 852                             c->limits[j].max > 1)
 853                                 return -EINVAL;
 854         }
 855
 856 #ifndef CONFIG_MAC80211_MESH
 857         /* mesh depends on Kconfig, but drivers should set it if they want */
 858         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 859 #endif
 860
 861         /* if the underlying driver supports mesh, mac80211 will (at least)
 862          * provide routing of mesh authentication frames to userspace */
 863         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 864                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 865
 866         /* mac80211 supports control port protocol changing */
 867         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 868
 869         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 870                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 871         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 872                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 873
 874         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 875              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 876              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 877
 878         /*
 879          * Calculate scan IE length -- we need this to alloc
 880          * memory and to subtract from the driver limit. It
 881          * includes the DS Params, (extended) supported rates, and HT
 882          * information -- SSID is the driver's responsibility.
 883          */
 884         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 885                 3 /* DS Params */;
 886         if (supp_ht)
 887                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 888
 889         if (supp_vht) {
 890                 local->scan_ies_len +=
 891                         2 + sizeof(struct ieee80211_vht_cap);
 892
 893                 /*
 894                  * (for now at least), drivers wanting to use VHT must
 895                  * support channel contexts, as they contain all the
 896                  * necessary VHT information and the global hw config
 897                  * doesn't (yet)
 898                  */
 899                 if (WARN_ON(!local->use_chanctx)) {
 900                         result = -EINVAL;
 901                         goto fail_wiphy_register;
 902                 }
 903         }
 904
 905         if (!local->ops->hw_scan) {
 906                 /* For hw_scan, driver needs to set these up. */
 907                 local->hw.wiphy->max_scan_ssids = 4;
 908                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 909         }
 910
 911         /*
 912          * If the driver supports any scan IEs, then assume the
 913          * limit includes the IEs mac80211 will add, otherwise
 914          * leave it at zero and let the driver sort it out; we
 915          * still pass our IEs to the driver but userspace will
 916          * not be allowed to in that case.
 917          */
 918         if (local->hw.wiphy->max_scan_ie_len)
 919                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 920
 921         /* Set up cipher suites unless driver already did */
 922         if (!local->hw.wiphy->cipher_suites) {
 923                 local->hw.wiphy->cipher_suites = cipher_suites;
 924                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 925                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 926                         local->hw.wiphy->n_cipher_suites--;
 927         }
 928         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 929                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 930                         local->hw.wiphy->cipher_suites += 2;
 931                         local->hw.wiphy->n_cipher_suites -= 2;
 932                 } else {
 933                         u32 *suites;
 934                         int r, w = 0;
 935
 936                         /* Filter out WEP */
 937
 938                         suites = kmemdup(
 939                                 local->hw.wiphy->cipher_suites,
 940                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 941                                 GFP_KERNEL);
 942                         if (!suites) {
 943                                 result = -ENOMEM;
 944                                 goto fail_wiphy_register;
 945                         }
 946                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 947                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 948                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 949                                     suite == WLAN_CIPHER_SUITE_WEP104)
 950                                         continue;
 951                                 suites[w++] = suite;
 952                         }
 953                         local->hw.wiphy->cipher_suites = suites;
 954                         local->hw.wiphy->n_cipher_suites = w;
 955                         local->wiphy_ciphers_allocated = true;
 956                 }
 957         }
 958
 959         if (!local->ops->remain_on_channel)
 960                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 961
 962         if (local->ops->sched_scan_start)
 963                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 964
 965         /* mac80211 based drivers don't support internal TDLS setup */
 966         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 967                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 968
 969         result = wiphy_register(local->hw.wiphy);
 970         if (result < 0)
 971                 goto fail_wiphy_register;
 972
 973         /*
 974          * We use the number of queues for feature tests (QoS, HT) internally
 975          * so restrict them appropriately.
 976          */
 977         if (hw->queues > IEEE80211_MAX_QUEUES)
 978                 hw->queues = IEEE80211_MAX_QUEUES;
 979
 980         local->workqueue =
 981                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 982         if (!local->workqueue) {
 983                 result = -ENOMEM;
 984                 goto fail_workqueue;
 985         }
 986
 987         /*
 988          * The hardware needs headroom for sending the frame,
 989          * and we need some headroom for passing the frame to monitor
 990          * interfaces, but never both at the same time.
 991          */
 992         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 993                                    IEEE80211_TX_STATUS_HEADROOM);
 994
 995         debugfs_hw_add(local);
 996
 997         /*
 998          * if the driver doesn't specify a max listen interval we
 999          * use 5 which should be a safe default
1000          */
1001         if (local->hw.max_listen_interval == 0)
1002                 local->hw.max_listen_interval = 5;
1003
1004         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1005
1006         local->dynamic_ps_forced_timeout = -1;
1007
1008         result = ieee80211_wep_init(local);
1009         if (result < 0)
1010                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
1011                             result);
1012
1013         ieee80211_led_init(local);
1014
1015         rtnl_lock();
1016
1017         result = ieee80211_init_rate_ctrl_alg(local,
1018                                               hw->rate_control_algorithm);
1019         if (result < 0) {
1020                 wiphy_debug(local->hw.wiphy,
1021                             "Failed to initialize rate control algorithm\n");
1022                 goto fail_rate;
1023         }
1024
1025         /* add one default STA interface if supported */
1026         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1027                 result = ieee80211_if_add(local, "wlan%d", NULL,
1028                                           NL80211_IFTYPE_STATION, NULL);
1029                 if (result)
1030                         wiphy_warn(local->hw.wiphy,
1031                                    "Failed to add default virtual iface\n");
1032         }
1033
1034         rtnl_unlock();
1035
1036         local->network_latency_notifier.notifier_call =
1037                 ieee80211_max_network_latency;
1038         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1039                                      &local->network_latency_notifier);
1040         if (result) {
1041                 rtnl_lock();
1042                 goto fail_pm_qos;
1043         }
1044
1045 #ifdef CONFIG_INET
1046         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1047         result = register_inetaddr_notifier(&local->ifa_notifier);
1048         if (result)
1049                 goto fail_ifa;
1050 #endif
1051
1052         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
1053                         local->hw.napi_weight);
1054
1055         return 0;
1056
1057 #ifdef CONFIG_INET
1058  fail_ifa:
1059         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1060                                &local->network_latency_notifier);
1061         rtnl_lock();
1062 #endif
1063  fail_pm_qos:
1064         ieee80211_led_exit(local);
1065         ieee80211_remove_interfaces(local);
1066  fail_rate:
1067         rtnl_unlock();
1068         ieee80211_wep_free(local);
1069         sta_info_stop(local);
1070         destroy_workqueue(local->workqueue);
1071  fail_workqueue:
1072         wiphy_unregister(local->hw.wiphy);
1073  fail_wiphy_register:
1074         if (local->wiphy_ciphers_allocated)
1075                 kfree(local->hw.wiphy->cipher_suites);
1076         kfree(local->int_scan_req);
1077         return result;
1078 }
1079 EXPORT_SYMBOL(ieee80211_register_hw);
1080
1081 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1082 {
1083         struct ieee80211_local *local = hw_to_local(hw);
1084
1085         tasklet_kill(&local->tx_pending_tasklet);
1086         tasklet_kill(&local->tasklet);
1087
1088         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1089                                &local->network_latency_notifier);
1090 #ifdef CONFIG_INET
1091         unregister_inetaddr_notifier(&local->ifa_notifier);
1092 #endif
1093
1094         rtnl_lock();
1095
1096         /*
1097          * At this point, interface list manipulations are fine
1098          * because the driver cannot be handing us frames any
1099          * more and the tasklet is killed.
1100          */
1101         ieee80211_remove_interfaces(local);
1102
1103         rtnl_unlock();
1104
1105         cancel_work_sync(&local->restart_work);
1106         cancel_work_sync(&local->reconfig_filter);
1107
1108         ieee80211_clear_tx_pending(local);
1109         rate_control_deinitialize(local);
1110
1111         if (skb_queue_len(&local->skb_queue) ||
1112             skb_queue_len(&local->skb_queue_unreliable))
1113                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1114         skb_queue_purge(&local->skb_queue);
1115         skb_queue_purge(&local->skb_queue_unreliable);
1116         skb_queue_purge(&local->rx_skb_queue);
1117
1118         destroy_workqueue(local->workqueue);
1119         wiphy_unregister(local->hw.wiphy);
1120         sta_info_stop(local);
1121         ieee80211_wep_free(local);
1122         ieee80211_led_exit(local);
1123         kfree(local->int_scan_req);
1124 }
1125 EXPORT_SYMBOL(ieee80211_unregister_hw);
1126
1127 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1128 {
1129         WARN_ONCE(1, "Have pending ack frames!\n");
1130         kfree_skb(p);
1131         return 0;
1132 }
1133
1134 void ieee80211_free_hw(struct ieee80211_hw *hw)
1135 {
1136         struct ieee80211_local *local = hw_to_local(hw);
1137
1138         mutex_destroy(&local->iflist_mtx);
1139         mutex_destroy(&local->mtx);
1140
1141         if (local->wiphy_ciphers_allocated)
1142                 kfree(local->hw.wiphy->cipher_suites);
1143
1144         idr_for_each(&local->ack_status_frames,
1145                      ieee80211_free_ack_frame, NULL);
1146         idr_destroy(&local->ack_status_frames);
1147
1148         wiphy_free(local->hw.wiphy);
1149 }
1150 EXPORT_SYMBOL(ieee80211_free_hw);
1151
1152 static int __init ieee80211_init(void)
1153 {
1154         struct sk_buff *skb;
1155         int ret;
1156
1157         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1158         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1159                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1160
1161         ret = rc80211_minstrel_init();
1162         if (ret)
1163                 return ret;
1164
1165         ret = rc80211_minstrel_ht_init();
1166         if (ret)
1167                 goto err_minstrel;
1168
1169         ret = rc80211_pid_init();
1170         if (ret)
1171                 goto err_pid;
1172
1173         ret = ieee80211_iface_init();
1174         if (ret)
1175                 goto err_netdev;
1176
1177         return 0;
1178  err_netdev:
1179         rc80211_pid_exit();
1180  err_pid:
1181         rc80211_minstrel_ht_exit();
1182  err_minstrel:
1183         rc80211_minstrel_exit();
1184
1185         return ret;
1186 }
1187
1188 static void __exit ieee80211_exit(void)
1189 {
1190         rc80211_pid_exit();
1191         rc80211_minstrel_ht_exit();
1192         rc80211_minstrel_exit();
1193
1194         if (mesh_allocated)
1195                 ieee80211s_stop();
1196
1197         ieee80211_iface_exit();
1198
1199         rcu_barrier();
1200 }
1201
1202
1203 subsys_initcall(ieee80211_init);
1204 module_exit(ieee80211_exit);
1205
1206 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1207 MODULE_LICENSE("GPL");