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_params.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
  37 bool ieee80211_disable_40mhz_24ghz;
  38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
  39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
  40                  "Disable 40MHz support in the 2.4GHz band");
  41
  42 static struct lock_class_key ieee80211_rx_skb_queue_class;
  43
  44 void ieee80211_configure_filter(struct ieee80211_local *local)
  45 {
  46         u64 mc;
  47         unsigned int changed_flags;
  48         unsigned int new_flags = 0;
  49
  50         if (atomic_read(&local->iff_promiscs))
  51                 new_flags |= FIF_PROMISC_IN_BSS;
  52
  53         if (atomic_read(&local->iff_allmultis))
  54                 new_flags |= FIF_ALLMULTI;
  55
  56         if (local->monitors || local->scanning)
  57                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  58
  59         if (local->fif_probe_req || local->probe_req_reg)
  60                 new_flags |= FIF_PROBE_REQ;
  61
  62         if (local->fif_fcsfail)
  63                 new_flags |= FIF_FCSFAIL;
  64
  65         if (local->fif_plcpfail)
  66                 new_flags |= FIF_PLCPFAIL;
  67
  68         if (local->fif_control)
  69                 new_flags |= FIF_CONTROL;
  70
  71         if (local->fif_other_bss)
  72                 new_flags |= FIF_OTHER_BSS;
  73
  74         if (local->fif_pspoll)
  75                 new_flags |= FIF_PSPOLL;
  76
  77         spin_lock_bh(&local->filter_lock);
  78         changed_flags = local->filter_flags ^ new_flags;
  79
  80         mc = drv_prepare_multicast(local, &local->mc_list);
  81         spin_unlock_bh(&local->filter_lock);
  82
  83         /* be a bit nasty */
  84         new_flags |= (1<<31);
  85
  86         drv_configure_filter(local, changed_flags, &new_flags, mc);
  87
  88         WARN_ON(new_flags & (1<<31));
  89
  90         local->filter_flags = new_flags & ~(1<<31);
  91 }
  92
  93 static void ieee80211_reconfig_filter(struct work_struct *work)
  94 {
  95         struct ieee80211_local *local =
  96                 container_of(work, struct ieee80211_local, reconfig_filter);
  97
  98         ieee80211_configure_filter(local);
  99 }
 100
 101 /*
 102  * Returns true if we are logically configured to be on
 103  * the operating channel AND the hardware-conf is currently
 104  * configured on the operating channel.  Compares channel-type
 105  * as well.
 106  */
 107 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
 108 {
 109         struct ieee80211_channel *chan, *scan_chan;
 110         enum nl80211_channel_type channel_type;
 111
 112         /* This logic needs to match logic in ieee80211_hw_config */
 113         if (local->scan_channel) {
 114                 chan = local->scan_channel;
 115                 channel_type = NL80211_CHAN_NO_HT;
 116         } else if (local->tmp_channel) {
 117                 chan = scan_chan = local->tmp_channel;
 118                 channel_type = local->tmp_channel_type;
 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                 return false;
 127
 128         /* Check current hardware-config against oper_channel. */
 129         if ((local->oper_channel != local->hw.conf.channel) ||
 130             (local->_oper_channel_type != local->hw.conf.channel_type))
 131                 return false;
 132
 133         return true;
 134 }
 135
 136 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 137 {
 138         struct ieee80211_channel *chan, *scan_chan;
 139         int ret = 0;
 140         int power;
 141         enum nl80211_channel_type channel_type;
 142         u32 offchannel_flag;
 143
 144         might_sleep();
 145
 146         scan_chan = local->scan_channel;
 147
 148         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
 149          * may need to change as well.
 150          */
 151         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 152         if (scan_chan) {
 153                 chan = scan_chan;
 154                 channel_type = NL80211_CHAN_NO_HT;
 155         } else if (local->tmp_channel) {
 156                 chan = scan_chan = local->tmp_channel;
 157                 channel_type = local->tmp_channel_type;
 158         } else {
 159                 chan = local->oper_channel;
 160                 channel_type = local->_oper_channel_type;
 161         }
 162
 163         if (chan != local->oper_channel ||
 164             channel_type != local->_oper_channel_type)
 165                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 166         else
 167                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 168
 169         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 170
 171         if (offchannel_flag || chan != local->hw.conf.channel ||
 172             channel_type != local->hw.conf.channel_type) {
 173                 local->hw.conf.channel = chan;
 174                 local->hw.conf.channel_type = channel_type;
 175                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 176         }
 177
 178         if (!conf_is_ht(&local->hw.conf)) {
 179                 /*
 180                  * mac80211.h documents that this is only valid
 181                  * when the channel is set to an HT type, and
 182                  * that otherwise STATIC is used.
 183                  */
 184                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 185         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 186                 local->hw.conf.smps_mode = local->smps_mode;
 187                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 188         }
 189
 190         if (scan_chan)
 191                 power = chan->max_power;
 192         else
 193                 power = local->power_constr_level ?
 194                         (chan->max_power - local->power_constr_level) :
 195                         chan->max_power;
 196
 197         if (local->user_power_level >= 0)
 198                 power = min(power, local->user_power_level);
 199
 200         if (local->hw.conf.power_level != power) {
 201                 changed |= IEEE80211_CONF_CHANGE_POWER;
 202                 local->hw.conf.power_level = power;
 203         }
 204
 205         if (changed && local->open_count) {
 206                 ret = drv_config(local, changed);
 207                 /*
 208                  * Goal:
 209                  * HW reconfiguration should never fail, the driver has told
 210                  * us what it can support so it should live up to that promise.
 211                  *
 212                  * Current status:
 213                  * rfkill is not integrated with mac80211 and a
 214                  * configuration command can thus fail if hardware rfkill
 215                  * is enabled
 216                  *
 217                  * FIXME: integrate rfkill with mac80211 and then add this
 218                  * WARN_ON() back
 219                  *
 220                  */
 221                 /* WARN_ON(ret); */
 222         }
 223
 224         return ret;
 225 }
 226
 227 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 228                                       u32 changed)
 229 {
 230         struct ieee80211_local *local = sdata->local;
 231         static const u8 zero[ETH_ALEN] = { 0 };
 232
 233         if (!changed)
 234                 return;
 235
 236         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 237                 /*
 238                  * While not associated, claim a BSSID of all-zeroes
 239                  * so that drivers don't do any weird things with the
 240                  * BSSID at that time.
 241                  */
 242                 if (sdata->vif.bss_conf.assoc)
 243                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 244                 else
 245                         sdata->vif.bss_conf.bssid = zero;
 246         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 247                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 248         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 249                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 250         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 251                 sdata->vif.bss_conf.bssid = NULL;
 252         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 253                 sdata->vif.bss_conf.bssid = zero;
 254         } else {
 255                 WARN_ON(1);
 256                 return;
 257         }
 258
 259         switch (sdata->vif.type) {
 260         case NL80211_IFTYPE_AP:
 261         case NL80211_IFTYPE_ADHOC:
 262         case NL80211_IFTYPE_WDS:
 263         case NL80211_IFTYPE_MESH_POINT:
 264                 break;
 265         default:
 266                 /* do not warn to simplify caller in scan.c */
 267                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 268                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 269                         return;
 270                 break;
 271         }
 272
 273         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 274                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 275                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 276                         sdata->vif.bss_conf.enable_beacon = false;
 277                 } else {
 278                         /*
 279                          * Beacon should be enabled, but AP mode must
 280                          * check whether there is a beacon configured.
 281                          */
 282                         switch (sdata->vif.type) {
 283                         case NL80211_IFTYPE_AP:
 284                                 sdata->vif.bss_conf.enable_beacon =
 285                                         !!sdata->u.ap.beacon;
 286                                 break;
 287                         case NL80211_IFTYPE_ADHOC:
 288                                 sdata->vif.bss_conf.enable_beacon =
 289                                         !!sdata->u.ibss.presp;
 290                                 break;
 291 #ifdef CONFIG_MAC80211_MESH
 292                         case NL80211_IFTYPE_MESH_POINT:
 293                                 sdata->vif.bss_conf.enable_beacon =
 294                                         !!sdata->u.mesh.mesh_id_len;
 295                                 break;
 296 #endif
 297                         default:
 298                                 /* not reached */
 299                                 WARN_ON(1);
 300                                 break;
 301                         }
 302                 }
 303         }
 304
 305         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 306 }
 307
 308 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 309 {
 310         sdata->vif.bss_conf.use_cts_prot = false;
 311         sdata->vif.bss_conf.use_short_preamble = false;
 312         sdata->vif.bss_conf.use_short_slot = false;
 313         return BSS_CHANGED_ERP_CTS_PROT |
 314                BSS_CHANGED_ERP_PREAMBLE |
 315                BSS_CHANGED_ERP_SLOT;
 316 }
 317
 318 static void ieee80211_tasklet_handler(unsigned long data)
 319 {
 320         struct ieee80211_local *local = (struct ieee80211_local *) data;
 321         struct sk_buff *skb;
 322
 323         while ((skb = skb_dequeue(&local->skb_queue)) ||
 324                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 325                 switch (skb->pkt_type) {
 326                 case IEEE80211_RX_MSG:
 327                         /* Clear skb->pkt_type in order to not confuse kernel
 328                          * netstack. */
 329                         skb->pkt_type = 0;
 330                         ieee80211_rx(local_to_hw(local), skb);
 331                         break;
 332                 case IEEE80211_TX_STATUS_MSG:
 333                         skb->pkt_type = 0;
 334                         ieee80211_tx_status(local_to_hw(local), skb);
 335                         break;
 336                 default:
 337                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 338                              skb->pkt_type);
 339                         dev_kfree_skb(skb);
 340                         break;
 341                 }
 342         }
 343 }
 344
 345 static void ieee80211_restart_work(struct work_struct *work)
 346 {
 347         struct ieee80211_local *local =
 348                 container_of(work, struct ieee80211_local, restart_work);
 349
 350         /* wait for scan work complete */
 351         flush_workqueue(local->workqueue);
 352
 353         mutex_lock(&local->mtx);
 354         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 355                 "%s called with hardware scan in progress\n", __func__);
 356         mutex_unlock(&local->mtx);
 357
 358         rtnl_lock();
 359         ieee80211_scan_cancel(local);
 360         ieee80211_reconfig(local);
 361         rtnl_unlock();
 362 }
 363
 364 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 365 {
 366         struct ieee80211_local *local = hw_to_local(hw);
 367
 368         trace_api_restart_hw(local);
 369
 370         /* use this reason, ieee80211_reconfig will unblock it */
 371         ieee80211_stop_queues_by_reason(hw,
 372                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 373
 374         schedule_work(&local->restart_work);
 375 }
 376 EXPORT_SYMBOL(ieee80211_restart_hw);
 377
 378 static void ieee80211_recalc_smps_work(struct work_struct *work)
 379 {
 380         struct ieee80211_local *local =
 381                 container_of(work, struct ieee80211_local, recalc_smps);
 382
 383         mutex_lock(&local->iflist_mtx);
 384         ieee80211_recalc_smps(local);
 385         mutex_unlock(&local->iflist_mtx);
 386 }
 387
 388 #ifdef CONFIG_INET
 389 static int ieee80211_ifa_changed(struct notifier_block *nb,
 390                                  unsigned long data, void *arg)
 391 {
 392         struct in_ifaddr *ifa = arg;
 393         struct ieee80211_local *local =
 394                 container_of(nb, struct ieee80211_local,
 395                              ifa_notifier);
 396         struct net_device *ndev = ifa->ifa_dev->dev;
 397         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 398         struct in_device *idev;
 399         struct ieee80211_sub_if_data *sdata;
 400         struct ieee80211_bss_conf *bss_conf;
 401         struct ieee80211_if_managed *ifmgd;
 402         int c = 0;
 403
 404         /* Make sure it's our interface that got changed */
 405         if (!wdev)
 406                 return NOTIFY_DONE;
 407
 408         if (wdev->wiphy != local->hw.wiphy)
 409                 return NOTIFY_DONE;
 410
 411         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 412         bss_conf = &sdata->vif.bss_conf;
 413
 414         if (!ieee80211_sdata_running(sdata))
 415                 return NOTIFY_DONE;
 416
 417         /* ARP filtering is only supported in managed mode */
 418         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 419                 return NOTIFY_DONE;
 420
 421         idev = __in_dev_get_rtnl(sdata->dev);
 422         if (!idev)
 423                 return NOTIFY_DONE;
 424
 425         ifmgd = &sdata->u.mgd;
 426         mutex_lock(&ifmgd->mtx);
 427
 428         /* Copy the addresses to the bss_conf list */
 429         ifa = idev->ifa_list;
 430         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 431                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 432                 ifa = ifa->ifa_next;
 433                 c++;
 434         }
 435
 436         /* If not all addresses fit the list, disable filtering */
 437         if (ifa) {
 438                 sdata->arp_filter_state = false;
 439                 c = 0;
 440         } else {
 441                 sdata->arp_filter_state = true;
 442         }
 443         bss_conf->arp_addr_cnt = c;
 444
 445         /* Configure driver only if associated */
 446         if (ifmgd->associated) {
 447                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 448                 ieee80211_bss_info_change_notify(sdata,
 449                                                  BSS_CHANGED_ARP_FILTER);
 450         }
 451
 452         mutex_unlock(&ifmgd->mtx);
 453
 454         return NOTIFY_DONE;
 455 }
 456 #endif
 457
 458 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 459 {
 460         struct ieee80211_local *local =
 461                 container_of(napi, struct ieee80211_local, napi);
 462
 463         return local->ops->napi_poll(&local->hw, budget);
 464 }
 465
 466 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 467 {
 468         struct ieee80211_local *local = hw_to_local(hw);
 469
 470         napi_schedule(&local->napi);
 471 }
 472 EXPORT_SYMBOL(ieee80211_napi_schedule);
 473
 474 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 475 {
 476         struct ieee80211_local *local = hw_to_local(hw);
 477
 478         napi_complete(&local->napi);
 479 }
 480 EXPORT_SYMBOL(ieee80211_napi_complete);
 481
 482 /* There isn't a lot of sense in it, but you can transmit anything you like */
 483 static const struct ieee80211_txrx_stypes
 484 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 485         [NL80211_IFTYPE_ADHOC] = {
 486                 .tx = 0xffff,
 487                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 488         },
 489         [NL80211_IFTYPE_STATION] = {
 490                 .tx = 0xffff,
 491                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 492                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 493         },
 494         [NL80211_IFTYPE_AP] = {
 495                 .tx = 0xffff,
 496                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 497                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 498                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 499                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 500                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 501                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 502                         BIT(IEEE80211_STYPE_ACTION >> 4),
 503         },
 504         [NL80211_IFTYPE_AP_VLAN] = {
 505                 /* copy AP */
 506                 .tx = 0xffff,
 507                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 508                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 509                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 510                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 511                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 512                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 513                         BIT(IEEE80211_STYPE_ACTION >> 4),
 514         },
 515         [NL80211_IFTYPE_P2P_CLIENT] = {
 516                 .tx = 0xffff,
 517                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 518                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 519         },
 520         [NL80211_IFTYPE_P2P_GO] = {
 521                 .tx = 0xffff,
 522                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 523                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 524                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 525                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 526                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 527                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 528                         BIT(IEEE80211_STYPE_ACTION >> 4),
 529         },
 530         [NL80211_IFTYPE_MESH_POINT] = {
 531                 .tx = 0xffff,
 532                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 533         },
 534 };
 535
 536 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 537                                         const struct ieee80211_ops *ops)
 538 {
 539         struct ieee80211_local *local;
 540         int priv_size, i;
 541         struct wiphy *wiphy;
 542
 543         /* Ensure 32-byte alignment of our private data and hw private data.
 544          * We use the wiphy priv data for both our ieee80211_local and for
 545          * the driver's private data
 546          *
 547          * In memory it'll be like this:
 548          *
 549          * +-------------------------+
 550          * | struct wiphy           |
 551          * +-------------------------+
 552          * | struct ieee80211_local  |
 553          * +-------------------------+
 554          * | driver's private data   |
 555          * +-------------------------+
 556          *
 557          */
 558         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 559
 560         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 561
 562         if (!wiphy)
 563                 return NULL;
 564
 565         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 566
 567         wiphy->privid = mac80211_wiphy_privid;
 568
 569         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 570                         WIPHY_FLAG_4ADDR_AP |
 571                         WIPHY_FLAG_4ADDR_STATION |
 572                         WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS;
 573
 574         if (!ops->set_key)
 575                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 576
 577         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 578
 579         local = wiphy_priv(wiphy);
 580
 581         local->hw.wiphy = wiphy;
 582
 583         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 584
 585         BUG_ON(!ops->tx);
 586         BUG_ON(!ops->start);
 587         BUG_ON(!ops->stop);
 588         BUG_ON(!ops->config);
 589         BUG_ON(!ops->add_interface);
 590         BUG_ON(!ops->remove_interface);
 591         BUG_ON(!ops->configure_filter);
 592         local->ops = ops;
 593
 594         /* set up some defaults */
 595         local->hw.queues = 1;
 596         local->hw.max_rates = 1;
 597         local->hw.max_report_rates = 0;
 598         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 599         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 600         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 601         local->user_power_level = -1;
 602         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 603         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 604
 605         INIT_LIST_HEAD(&local->interfaces);
 606
 607         __hw_addr_init(&local->mc_list);
 608
 609         mutex_init(&local->iflist_mtx);
 610         mutex_init(&local->mtx);
 611
 612         mutex_init(&local->key_mtx);
 613         spin_lock_init(&local->filter_lock);
 614         spin_lock_init(&local->queue_stop_reason_lock);
 615
 616         /*
 617          * The rx_skb_queue is only accessed from tasklets,
 618          * but other SKB queues are used from within IRQ
 619          * context. Therefore, this one needs a different
 620          * locking class so our direct, non-irq-safe use of
 621          * the queue's lock doesn't throw lockdep warnings.
 622          */
 623         skb_queue_head_init_class(&local->rx_skb_queue,
 624                                   &ieee80211_rx_skb_queue_class);
 625
 626         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 627
 628         ieee80211_work_init(local);
 629
 630         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 631
 632         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 633         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 634         local->smps_mode = IEEE80211_SMPS_OFF;
 635
 636         INIT_WORK(&local->dynamic_ps_enable_work,
 637                   ieee80211_dynamic_ps_enable_work);
 638         INIT_WORK(&local->dynamic_ps_disable_work,
 639                   ieee80211_dynamic_ps_disable_work);
 640         setup_timer(&local->dynamic_ps_timer,
 641                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 642
 643         sta_info_init(local);
 644
 645         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 646                 skb_queue_head_init(&local->pending[i]);
 647                 atomic_set(&local->agg_queue_stop[i], 0);
 648         }
 649         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 650                      (unsigned long)local);
 651
 652         tasklet_init(&local->tasklet,
 653                      ieee80211_tasklet_handler,
 654                      (unsigned long) local);
 655
 656         skb_queue_head_init(&local->skb_queue);
 657         skb_queue_head_init(&local->skb_queue_unreliable);
 658
 659         /* init dummy netdev for use w/ NAPI */
 660         init_dummy_netdev(&local->napi_dev);
 661
 662         ieee80211_led_names(local);
 663
 664         ieee80211_hw_roc_setup(local);
 665
 666         return local_to_hw(local);
 667 }
 668 EXPORT_SYMBOL(ieee80211_alloc_hw);
 669
 670 int ieee80211_register_hw(struct ieee80211_hw *hw)
 671 {
 672         struct ieee80211_local *local = hw_to_local(hw);
 673         int result;
 674         enum ieee80211_band band;
 675         int channels, max_bitrates;
 676         bool supp_ht;
 677         static const u32 cipher_suites[] = {
 678                 /* keep WEP first, it may be removed below */
 679                 WLAN_CIPHER_SUITE_WEP40,
 680                 WLAN_CIPHER_SUITE_WEP104,
 681                 WLAN_CIPHER_SUITE_TKIP,
 682                 WLAN_CIPHER_SUITE_CCMP,
 683
 684                 /* keep last -- depends on hw flags! */
 685                 WLAN_CIPHER_SUITE_AES_CMAC
 686         };
 687
 688         if (hw->max_report_rates == 0)
 689                 hw->max_report_rates = hw->max_rates;
 690
 691         /*
 692          * generic code guarantees at least one band,
 693          * set this very early because much code assumes
 694          * that hw.conf.channel is assigned
 695          */
 696         channels = 0;
 697         max_bitrates = 0;
 698         supp_ht = false;
 699         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 700                 struct ieee80211_supported_band *sband;
 701
 702                 sband = local->hw.wiphy->bands[band];
 703                 if (!sband)
 704                         continue;
 705                 if (!local->oper_channel) {
 706                         /* init channel we're on */
 707                         local->hw.conf.channel =
 708                         local->oper_channel = &sband->channels[0];
 709                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 710                 }
 711                 channels += sband->n_channels;
 712
 713                 if (max_bitrates < sband->n_bitrates)
 714                         max_bitrates = sband->n_bitrates;
 715                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 716         }
 717
 718         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 719                                       sizeof(void *) * channels, GFP_KERNEL);
 720         if (!local->int_scan_req)
 721                 return -ENOMEM;
 722
 723         /* if low-level driver supports AP, we also support VLAN */
 724         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 725                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 726
 727         /* mac80211 always supports monitor */
 728         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 729
 730 #ifndef CONFIG_MAC80211_MESH
 731         /* mesh depends on Kconfig, but drivers should set it if they want */
 732         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 733 #endif
 734
 735         /* mac80211 supports control port protocol changing */
 736         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 737
 738         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 739                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 740         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 741                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 742
 743         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 744              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 745              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 746
 747         /*
 748          * Calculate scan IE length -- we need this to alloc
 749          * memory and to subtract from the driver limit. It
 750          * includes the DS Params, (extended) supported rates, and HT
 751          * information -- SSID is the driver's responsibility.
 752          */
 753         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 754                 3 /* DS Params */;
 755         if (supp_ht)
 756                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 757
 758         if (!local->ops->hw_scan) {
 759                 /* For hw_scan, driver needs to set these up. */
 760                 local->hw.wiphy->max_scan_ssids = 4;
 761                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 762         }
 763
 764         /*
 765          * If the driver supports any scan IEs, then assume the
 766          * limit includes the IEs mac80211 will add, otherwise
 767          * leave it at zero and let the driver sort it out; we
 768          * still pass our IEs to the driver but userspace will
 769          * not be allowed to in that case.
 770          */
 771         if (local->hw.wiphy->max_scan_ie_len)
 772                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 773
 774         /* Set up cipher suites unless driver already did */
 775         if (!local->hw.wiphy->cipher_suites) {
 776                 local->hw.wiphy->cipher_suites = cipher_suites;
 777                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 778                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 779                         local->hw.wiphy->n_cipher_suites--;
 780         }
 781         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 782                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 783                         local->hw.wiphy->cipher_suites += 2;
 784                         local->hw.wiphy->n_cipher_suites -= 2;
 785                 } else {
 786                         u32 *suites;
 787                         int r, w = 0;
 788
 789                         /* Filter out WEP */
 790
 791                         suites = kmemdup(
 792                                 local->hw.wiphy->cipher_suites,
 793                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 794                                 GFP_KERNEL);
 795                         if (!suites)
 796                                 return -ENOMEM;
 797                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 798                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 799                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 800                                     suite == WLAN_CIPHER_SUITE_WEP104)
 801                                         continue;
 802                                 suites[w++] = suite;
 803                         }
 804                         local->hw.wiphy->cipher_suites = suites;
 805                         local->hw.wiphy->n_cipher_suites = w;
 806                         local->wiphy_ciphers_allocated = true;
 807                 }
 808         }
 809
 810         if (!local->ops->remain_on_channel)
 811                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 812
 813         result = wiphy_register(local->hw.wiphy);
 814         if (result < 0)
 815                 goto fail_wiphy_register;
 816
 817         /*
 818          * We use the number of queues for feature tests (QoS, HT) internally
 819          * so restrict them appropriately.
 820          */
 821         if (hw->queues > IEEE80211_MAX_QUEUES)
 822                 hw->queues = IEEE80211_MAX_QUEUES;
 823
 824         local->workqueue =
 825                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 826         if (!local->workqueue) {
 827                 result = -ENOMEM;
 828                 goto fail_workqueue;
 829         }
 830
 831         /*
 832          * The hardware needs headroom for sending the frame,
 833          * and we need some headroom for passing the frame to monitor
 834          * interfaces, but never both at the same time.
 835          */
 836         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 837                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 838         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 839                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 840
 841         debugfs_hw_add(local);
 842
 843         /*
 844          * if the driver doesn't specify a max listen interval we
 845          * use 5 which should be a safe default
 846          */
 847         if (local->hw.max_listen_interval == 0)
 848                 local->hw.max_listen_interval = 5;
 849
 850         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 851
 852         local->dynamic_ps_forced_timeout = -1;
 853
 854         result = sta_info_start(local);
 855         if (result < 0)
 856                 goto fail_sta_info;
 857
 858         result = ieee80211_wep_init(local);
 859         if (result < 0)
 860                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 861                             result);
 862
 863         rtnl_lock();
 864
 865         result = ieee80211_init_rate_ctrl_alg(local,
 866                                               hw->rate_control_algorithm);
 867         if (result < 0) {
 868                 wiphy_debug(local->hw.wiphy,
 869                             "Failed to initialize rate control algorithm\n");
 870                 goto fail_rate;
 871         }
 872
 873         /* add one default STA interface if supported */
 874         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 875                 result = ieee80211_if_add(local, "wlan%d", NULL,
 876                                           NL80211_IFTYPE_STATION, NULL);
 877                 if (result)
 878                         wiphy_warn(local->hw.wiphy,
 879                                    "Failed to add default virtual iface\n");
 880         }
 881
 882         rtnl_unlock();
 883
 884         ieee80211_led_init(local);
 885
 886         local->network_latency_notifier.notifier_call =
 887                 ieee80211_max_network_latency;
 888         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 889                                      &local->network_latency_notifier);
 890         if (result) {
 891                 rtnl_lock();
 892                 goto fail_pm_qos;
 893         }
 894
 895 #ifdef CONFIG_INET
 896         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 897         result = register_inetaddr_notifier(&local->ifa_notifier);
 898         if (result)
 899                 goto fail_ifa;
 900 #endif
 901
 902         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 903                         local->hw.napi_weight);
 904
 905         return 0;
 906
 907 #ifdef CONFIG_INET
 908  fail_ifa:
 909         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 910                                &local->network_latency_notifier);
 911         rtnl_lock();
 912 #endif
 913  fail_pm_qos:
 914         ieee80211_led_exit(local);
 915         ieee80211_remove_interfaces(local);
 916  fail_rate:
 917         rtnl_unlock();
 918         ieee80211_wep_free(local);
 919         sta_info_stop(local);
 920  fail_sta_info:
 921         destroy_workqueue(local->workqueue);
 922  fail_workqueue:
 923         wiphy_unregister(local->hw.wiphy);
 924  fail_wiphy_register:
 925         if (local->wiphy_ciphers_allocated)
 926                 kfree(local->hw.wiphy->cipher_suites);
 927         kfree(local->int_scan_req);
 928         return result;
 929 }
 930 EXPORT_SYMBOL(ieee80211_register_hw);
 931
 932 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 933 {
 934         struct ieee80211_local *local = hw_to_local(hw);
 935
 936         tasklet_kill(&local->tx_pending_tasklet);
 937         tasklet_kill(&local->tasklet);
 938
 939         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 940                                &local->network_latency_notifier);
 941 #ifdef CONFIG_INET
 942         unregister_inetaddr_notifier(&local->ifa_notifier);
 943 #endif
 944
 945         rtnl_lock();
 946
 947         /*
 948          * At this point, interface list manipulations are fine
 949          * because the driver cannot be handing us frames any
 950          * more and the tasklet is killed.
 951          */
 952         ieee80211_remove_interfaces(local);
 953
 954         rtnl_unlock();
 955
 956         /*
 957          * Now all work items will be gone, but the
 958          * timer might still be armed, so delete it
 959          */
 960         del_timer_sync(&local->work_timer);
 961
 962         cancel_work_sync(&local->restart_work);
 963         cancel_work_sync(&local->reconfig_filter);
 964
 965         ieee80211_clear_tx_pending(local);
 966         sta_info_stop(local);
 967         rate_control_deinitialize(local);
 968
 969         if (skb_queue_len(&local->skb_queue) ||
 970             skb_queue_len(&local->skb_queue_unreliable))
 971                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
 972         skb_queue_purge(&local->skb_queue);
 973         skb_queue_purge(&local->skb_queue_unreliable);
 974         skb_queue_purge(&local->rx_skb_queue);
 975
 976         destroy_workqueue(local->workqueue);
 977         wiphy_unregister(local->hw.wiphy);
 978         ieee80211_wep_free(local);
 979         ieee80211_led_exit(local);
 980         kfree(local->int_scan_req);
 981 }
 982 EXPORT_SYMBOL(ieee80211_unregister_hw);
 983
 984 void ieee80211_free_hw(struct ieee80211_hw *hw)
 985 {
 986         struct ieee80211_local *local = hw_to_local(hw);
 987
 988         mutex_destroy(&local->iflist_mtx);
 989         mutex_destroy(&local->mtx);
 990
 991         if (local->wiphy_ciphers_allocated)
 992                 kfree(local->hw.wiphy->cipher_suites);
 993
 994         wiphy_free(local->hw.wiphy);
 995 }
 996 EXPORT_SYMBOL(ieee80211_free_hw);
 997
 998 static int __init ieee80211_init(void)
 999 {
1000         struct sk_buff *skb;
1001         int ret;
1002
1003         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1004         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1005                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1006
1007         ret = rc80211_minstrel_init();
1008         if (ret)
1009                 return ret;
1010
1011         ret = rc80211_minstrel_ht_init();
1012         if (ret)
1013                 goto err_minstrel;
1014
1015         ret = rc80211_pid_init();
1016         if (ret)
1017                 goto err_pid;
1018
1019         ret = ieee80211_iface_init();
1020         if (ret)
1021                 goto err_netdev;
1022
1023         return 0;
1024  err_netdev:
1025         rc80211_pid_exit();
1026  err_pid:
1027         rc80211_minstrel_ht_exit();
1028  err_minstrel:
1029         rc80211_minstrel_exit();
1030
1031         return ret;
1032 }
1033
1034 static void __exit ieee80211_exit(void)
1035 {
1036         rc80211_pid_exit();
1037         rc80211_minstrel_ht_exit();
1038         rc80211_minstrel_exit();
1039
1040         if (mesh_allocated)
1041                 ieee80211s_stop();
1042
1043         ieee80211_iface_exit();
1044 }
1045
1046
1047 subsys_initcall(ieee80211_init);
1048 module_exit(ieee80211_exit);
1049
1050 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1051 MODULE_LICENSE("GPL");