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