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 void ieee80211_configure_filter(struct ieee80211_local *local)
  43 {
  44         u64 mc;
  45         unsigned int changed_flags;
  46         unsigned int new_flags = 0;
  47
  48         if (atomic_read(&local->iff_promiscs))
  49                 new_flags |= FIF_PROMISC_IN_BSS;
  50
  51         if (atomic_read(&local->iff_allmultis))
  52                 new_flags |= FIF_ALLMULTI;
  53
  54         if (local->monitors || local->scanning)
  55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  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 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  97 {
  98         struct ieee80211_channel *chan, *scan_chan;
  99         int ret = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102         u32 offchannel_flag;
 103
 104         might_sleep();
 105
 106         scan_chan = local->scan_channel;
 107
 108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 109         if (scan_chan) {
 110                 chan = scan_chan;
 111                 channel_type = NL80211_CHAN_NO_HT;
 112                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 113         } else if (local->tmp_channel &&
 114                    local->oper_channel != local->tmp_channel) {
 115                 chan = scan_chan = local->tmp_channel;
 116                 channel_type = local->tmp_channel_type;
 117                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 118         } else {
 119                 chan = local->oper_channel;
 120                 channel_type = local->_oper_channel_type;
 121                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 122         }
 123         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 124
 125         if (offchannel_flag || chan != local->hw.conf.channel ||
 126             channel_type != local->hw.conf.channel_type) {
 127                 local->hw.conf.channel = chan;
 128                 local->hw.conf.channel_type = channel_type;
 129                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 130         }
 131
 132         if (!conf_is_ht(&local->hw.conf)) {
 133                 /*
 134                  * mac80211.h documents that this is only valid
 135                  * when the channel is set to an HT type, and
 136                  * that otherwise STATIC is used.
 137                  */
 138                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 139         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 140                 local->hw.conf.smps_mode = local->smps_mode;
 141                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 142         }
 143
 144         if (scan_chan)
 145                 power = chan->max_power;
 146         else
 147                 power = local->power_constr_level ?
 148                         (chan->max_power - local->power_constr_level) :
 149                         chan->max_power;
 150
 151         if (local->user_power_level >= 0)
 152                 power = min(power, local->user_power_level);
 153
 154         if (local->hw.conf.power_level != power) {
 155                 changed |= IEEE80211_CONF_CHANGE_POWER;
 156                 local->hw.conf.power_level = power;
 157         }
 158
 159         if (changed && local->open_count) {
 160                 ret = drv_config(local, changed);
 161                 /*
 162                  * Goal:
 163                  * HW reconfiguration should never fail, the driver has told
 164                  * us what it can support so it should live up to that promise.
 165                  *
 166                  * Current status:
 167                  * rfkill is not integrated with mac80211 and a
 168                  * configuration command can thus fail if hardware rfkill
 169                  * is enabled
 170                  *
 171                  * FIXME: integrate rfkill with mac80211 and then add this
 172                  * WARN_ON() back
 173                  *
 174                  */
 175                 /* WARN_ON(ret); */
 176         }
 177
 178         return ret;
 179 }
 180
 181 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 182                                       u32 changed)
 183 {
 184         struct ieee80211_local *local = sdata->local;
 185         static const u8 zero[ETH_ALEN] = { 0 };
 186
 187         if (!changed)
 188                 return;
 189
 190         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 191                 /*
 192                  * While not associated, claim a BSSID of all-zeroes
 193                  * so that drivers don't do any weird things with the
 194                  * BSSID at that time.
 195                  */
 196                 if (sdata->vif.bss_conf.assoc)
 197                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 198                 else
 199                         sdata->vif.bss_conf.bssid = zero;
 200         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 201                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 202         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 203                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 204         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 205                 sdata->vif.bss_conf.bssid = zero;
 206         } else {
 207                 WARN_ON(1);
 208                 return;
 209         }
 210
 211         switch (sdata->vif.type) {
 212         case NL80211_IFTYPE_AP:
 213         case NL80211_IFTYPE_ADHOC:
 214         case NL80211_IFTYPE_MESH_POINT:
 215                 break;
 216         default:
 217                 /* do not warn to simplify caller in scan.c */
 218                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 219                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 220                         return;
 221                 break;
 222         }
 223
 224         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 225                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 226                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 227                         sdata->vif.bss_conf.enable_beacon = false;
 228                 } else {
 229                         /*
 230                          * Beacon should be enabled, but AP mode must
 231                          * check whether there is a beacon configured.
 232                          */
 233                         switch (sdata->vif.type) {
 234                         case NL80211_IFTYPE_AP:
 235                                 sdata->vif.bss_conf.enable_beacon =
 236                                         !!sdata->u.ap.beacon;
 237                                 break;
 238                         case NL80211_IFTYPE_ADHOC:
 239                                 sdata->vif.bss_conf.enable_beacon =
 240                                         !!sdata->u.ibss.presp;
 241                                 break;
 242                         case NL80211_IFTYPE_MESH_POINT:
 243                                 sdata->vif.bss_conf.enable_beacon = true;
 244                                 break;
 245                         default:
 246                                 /* not reached */
 247                                 WARN_ON(1);
 248                                 break;
 249                         }
 250                 }
 251         }
 252
 253         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 254 }
 255
 256 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 257 {
 258         sdata->vif.bss_conf.use_cts_prot = false;
 259         sdata->vif.bss_conf.use_short_preamble = false;
 260         sdata->vif.bss_conf.use_short_slot = false;
 261         return BSS_CHANGED_ERP_CTS_PROT |
 262                BSS_CHANGED_ERP_PREAMBLE |
 263                BSS_CHANGED_ERP_SLOT;
 264 }
 265
 266 static void ieee80211_tasklet_handler(unsigned long data)
 267 {
 268         struct ieee80211_local *local = (struct ieee80211_local *) data;
 269         struct sk_buff *skb;
 270
 271         while ((skb = skb_dequeue(&local->skb_queue)) ||
 272                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 273                 switch (skb->pkt_type) {
 274                 case IEEE80211_RX_MSG:
 275                         /* Clear skb->pkt_type in order to not confuse kernel
 276                          * netstack. */
 277                         skb->pkt_type = 0;
 278                         ieee80211_rx(local_to_hw(local), skb);
 279                         break;
 280                 case IEEE80211_TX_STATUS_MSG:
 281                         skb->pkt_type = 0;
 282                         ieee80211_tx_status(local_to_hw(local), skb);
 283                         break;
 284                 default:
 285                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 286                              skb->pkt_type);
 287                         dev_kfree_skb(skb);
 288                         break;
 289                 }
 290         }
 291 }
 292
 293 static void ieee80211_restart_work(struct work_struct *work)
 294 {
 295         struct ieee80211_local *local =
 296                 container_of(work, struct ieee80211_local, restart_work);
 297
 298         rtnl_lock();
 299         ieee80211_reconfig(local);
 300         rtnl_unlock();
 301 }
 302
 303 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 304 {
 305         struct ieee80211_local *local = hw_to_local(hw);
 306
 307         trace_api_restart_hw(local);
 308
 309         /* wait for scan work complete */
 310         flush_workqueue(local->workqueue);
 311
 312         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 313                 "%s called with hardware scan in progress\n", __func__);
 314
 315         if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)))
 316                 ieee80211_scan_cancel(local);
 317
 318         /* use this reason, ieee80211_reconfig will unblock it */
 319         ieee80211_stop_queues_by_reason(hw,
 320                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 321
 322         schedule_work(&local->restart_work);
 323 }
 324 EXPORT_SYMBOL(ieee80211_restart_hw);
 325
 326 static void ieee80211_recalc_smps_work(struct work_struct *work)
 327 {
 328         struct ieee80211_local *local =
 329                 container_of(work, struct ieee80211_local, recalc_smps);
 330
 331         mutex_lock(&local->iflist_mtx);
 332         ieee80211_recalc_smps(local, NULL);
 333         mutex_unlock(&local->iflist_mtx);
 334 }
 335
 336 #ifdef CONFIG_INET
 337 static int ieee80211_ifa_changed(struct notifier_block *nb,
 338                                  unsigned long data, void *arg)
 339 {
 340         struct in_ifaddr *ifa = arg;
 341         struct ieee80211_local *local =
 342                 container_of(nb, struct ieee80211_local,
 343                              ifa_notifier);
 344         struct net_device *ndev = ifa->ifa_dev->dev;
 345         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 346         struct in_device *idev;
 347         struct ieee80211_sub_if_data *sdata;
 348         struct ieee80211_bss_conf *bss_conf;
 349         struct ieee80211_if_managed *ifmgd;
 350         int c = 0;
 351
 352         /* Make sure it's our interface that got changed */
 353         if (!wdev)
 354                 return NOTIFY_DONE;
 355
 356         if (wdev->wiphy != local->hw.wiphy)
 357                 return NOTIFY_DONE;
 358
 359         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 360         bss_conf = &sdata->vif.bss_conf;
 361
 362         if (!ieee80211_sdata_running(sdata))
 363                 return NOTIFY_DONE;
 364
 365         /* ARP filtering is only supported in managed mode */
 366         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 367                 return NOTIFY_DONE;
 368
 369         idev = __in_dev_get_rtnl(sdata->dev);
 370         if (!idev)
 371                 return NOTIFY_DONE;
 372
 373         ifmgd = &sdata->u.mgd;
 374         mutex_lock(&ifmgd->mtx);
 375
 376         /* Copy the addresses to the bss_conf list */
 377         ifa = idev->ifa_list;
 378         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 379                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 380                 ifa = ifa->ifa_next;
 381                 c++;
 382         }
 383
 384         /* If not all addresses fit the list, disable filtering */
 385         if (ifa) {
 386                 sdata->arp_filter_state = false;
 387                 c = 0;
 388         } else {
 389                 sdata->arp_filter_state = true;
 390         }
 391         bss_conf->arp_addr_cnt = c;
 392
 393         /* Configure driver only if associated */
 394         if (ifmgd->associated) {
 395                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 396                 ieee80211_bss_info_change_notify(sdata,
 397                                                  BSS_CHANGED_ARP_FILTER);
 398         }
 399
 400         mutex_unlock(&ifmgd->mtx);
 401
 402         return NOTIFY_DONE;
 403 }
 404 #endif
 405
 406 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 407 {
 408         struct ieee80211_local *local =
 409                 container_of(napi, struct ieee80211_local, napi);
 410
 411         return local->ops->napi_poll(&local->hw, budget);
 412 }
 413
 414 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 415 {
 416         struct ieee80211_local *local = hw_to_local(hw);
 417
 418         napi_schedule(&local->napi);
 419 }
 420 EXPORT_SYMBOL(ieee80211_napi_schedule);
 421
 422 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 423 {
 424         struct ieee80211_local *local = hw_to_local(hw);
 425
 426         napi_complete(&local->napi);
 427 }
 428 EXPORT_SYMBOL(ieee80211_napi_complete);
 429
 430 /* There isn't a lot of sense in it, but you can transmit anything you like */
 431 static const struct ieee80211_txrx_stypes
 432 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 433         [NL80211_IFTYPE_ADHOC] = {
 434                 .tx = 0xffff,
 435                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 436         },
 437         [NL80211_IFTYPE_STATION] = {
 438                 .tx = 0xffff,
 439                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 440                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 441         },
 442         [NL80211_IFTYPE_AP] = {
 443                 .tx = 0xffff,
 444                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 445                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 446                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 447                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 448                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 449                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 450                         BIT(IEEE80211_STYPE_ACTION >> 4),
 451         },
 452         [NL80211_IFTYPE_AP_VLAN] = {
 453                 /* copy 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_P2P_CLIENT] = {
 464                 .tx = 0xffff,
 465                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 466                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 467         },
 468         [NL80211_IFTYPE_P2P_GO] = {
 469                 .tx = 0xffff,
 470                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 471                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 472                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 473                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 474                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 475                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 476                         BIT(IEEE80211_STYPE_ACTION >> 4),
 477         },
 478 };
 479
 480 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 481                                         const struct ieee80211_ops *ops)
 482 {
 483         struct ieee80211_local *local;
 484         int priv_size, i;
 485         struct wiphy *wiphy;
 486
 487         /* Ensure 32-byte alignment of our private data and hw private data.
 488          * We use the wiphy priv data for both our ieee80211_local and for
 489          * the driver's private data
 490          *
 491          * In memory it'll be like this:
 492          *
 493          * +-------------------------+
 494          * | struct wiphy           |
 495          * +-------------------------+
 496          * | struct ieee80211_local  |
 497          * +-------------------------+
 498          * | driver's private data   |
 499          * +-------------------------+
 500          *
 501          */
 502         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 503
 504         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 505
 506         if (!wiphy)
 507                 return NULL;
 508
 509         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 510
 511         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 512                         WIPHY_FLAG_4ADDR_AP |
 513                         WIPHY_FLAG_4ADDR_STATION;
 514         wiphy->privid = mac80211_wiphy_privid;
 515
 516         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 517
 518         local = wiphy_priv(wiphy);
 519
 520         local->hw.wiphy = wiphy;
 521
 522         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 523
 524         BUG_ON(!ops->tx);
 525         BUG_ON(!ops->start);
 526         BUG_ON(!ops->stop);
 527         BUG_ON(!ops->config);
 528         BUG_ON(!ops->add_interface);
 529         BUG_ON(!ops->remove_interface);
 530         BUG_ON(!ops->configure_filter);
 531         local->ops = ops;
 532
 533         /* set up some defaults */
 534         local->hw.queues = 1;
 535         local->hw.max_rates = 1;
 536         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 537         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 538         local->user_power_level = -1;
 539         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 540         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 541
 542         INIT_LIST_HEAD(&local->interfaces);
 543
 544         __hw_addr_init(&local->mc_list);
 545
 546         mutex_init(&local->iflist_mtx);
 547         mutex_init(&local->mtx);
 548
 549         mutex_init(&local->key_mtx);
 550         spin_lock_init(&local->filter_lock);
 551         spin_lock_init(&local->queue_stop_reason_lock);
 552
 553         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 554
 555         ieee80211_work_init(local);
 556
 557         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 558
 559         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 560         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 561         local->smps_mode = IEEE80211_SMPS_OFF;
 562
 563         INIT_WORK(&local->dynamic_ps_enable_work,
 564                   ieee80211_dynamic_ps_enable_work);
 565         INIT_WORK(&local->dynamic_ps_disable_work,
 566                   ieee80211_dynamic_ps_disable_work);
 567         setup_timer(&local->dynamic_ps_timer,
 568                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 569
 570         sta_info_init(local);
 571
 572         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 573                 skb_queue_head_init(&local->pending[i]);
 574                 atomic_set(&local->agg_queue_stop[i], 0);
 575         }
 576         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 577                      (unsigned long)local);
 578
 579         tasklet_init(&local->tasklet,
 580                      ieee80211_tasklet_handler,
 581                      (unsigned long) local);
 582
 583         skb_queue_head_init(&local->skb_queue);
 584         skb_queue_head_init(&local->skb_queue_unreliable);
 585
 586         /* init dummy netdev for use w/ NAPI */
 587         init_dummy_netdev(&local->napi_dev);
 588
 589         return local_to_hw(local);
 590 }
 591 EXPORT_SYMBOL(ieee80211_alloc_hw);
 592
 593 int ieee80211_register_hw(struct ieee80211_hw *hw)
 594 {
 595         struct ieee80211_local *local = hw_to_local(hw);
 596         int result;
 597         enum ieee80211_band band;
 598         int channels, max_bitrates;
 599         bool supp_ht;
 600         static const u32 cipher_suites[] = {
 601                 /* keep WEP first, it may be removed below */
 602                 WLAN_CIPHER_SUITE_WEP40,
 603                 WLAN_CIPHER_SUITE_WEP104,
 604                 WLAN_CIPHER_SUITE_TKIP,
 605                 WLAN_CIPHER_SUITE_CCMP,
 606
 607                 /* keep last -- depends on hw flags! */
 608                 WLAN_CIPHER_SUITE_AES_CMAC
 609         };
 610
 611         /*
 612          * generic code guarantees at least one band,
 613          * set this very early because much code assumes
 614          * that hw.conf.channel is assigned
 615          */
 616         channels = 0;
 617         max_bitrates = 0;
 618         supp_ht = false;
 619         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 620                 struct ieee80211_supported_band *sband;
 621
 622                 sband = local->hw.wiphy->bands[band];
 623                 if (!sband)
 624                         continue;
 625                 if (!local->oper_channel) {
 626                         /* init channel we're on */
 627                         local->hw.conf.channel =
 628                         local->oper_channel = &sband->channels[0];
 629                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 630                 }
 631                 channels += sband->n_channels;
 632
 633                 if (max_bitrates < sband->n_bitrates)
 634                         max_bitrates = sband->n_bitrates;
 635                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 636         }
 637
 638         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 639                                       sizeof(void *) * channels, GFP_KERNEL);
 640         if (!local->int_scan_req)
 641                 return -ENOMEM;
 642
 643         /* if low-level driver supports AP, we also support VLAN */
 644         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 645                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 646
 647         /* mac80211 always supports monitor */
 648         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 649
 650 #ifndef CONFIG_MAC80211_MESH
 651         /* mesh depends on Kconfig, but drivers should set it if they want */
 652         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 653 #endif
 654
 655         /* mac80211 supports control port protocol changing */
 656         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 657
 658         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 659                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 660         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 661                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 662
 663         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 664              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 665              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 666
 667         /*
 668          * Calculate scan IE length -- we need this to alloc
 669          * memory and to subtract from the driver limit. It
 670          * includes the (extended) supported rates and HT
 671          * information -- SSID is the driver's responsibility.
 672          */
 673         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 674         if (supp_ht)
 675                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 676
 677         if (!local->ops->hw_scan) {
 678                 /* For hw_scan, driver needs to set these up. */
 679                 local->hw.wiphy->max_scan_ssids = 4;
 680                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 681         }
 682
 683         /*
 684          * If the driver supports any scan IEs, then assume the
 685          * limit includes the IEs mac80211 will add, otherwise
 686          * leave it at zero and let the driver sort it out; we
 687          * still pass our IEs to the driver but userspace will
 688          * not be allowed to in that case.
 689          */
 690         if (local->hw.wiphy->max_scan_ie_len)
 691                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 692
 693         /* Set up cipher suites unless driver already did */
 694         if (!local->hw.wiphy->cipher_suites) {
 695                 local->hw.wiphy->cipher_suites = cipher_suites;
 696                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 697                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 698                         local->hw.wiphy->n_cipher_suites--;
 699         }
 700         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 701                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 702                         local->hw.wiphy->cipher_suites += 2;
 703                         local->hw.wiphy->n_cipher_suites -= 2;
 704                 } else {
 705                         u32 *suites;
 706                         int r, w = 0;
 707
 708                         /* Filter out WEP */
 709
 710                         suites = kmemdup(
 711                                 local->hw.wiphy->cipher_suites,
 712                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 713                                 GFP_KERNEL);
 714                         if (!suites)
 715                                 return -ENOMEM;
 716                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 717                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 718                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 719                                     suite == WLAN_CIPHER_SUITE_WEP104)
 720                                         continue;
 721                                 suites[w++] = suite;
 722                         }
 723                         local->hw.wiphy->cipher_suites = suites;
 724                         local->hw.wiphy->n_cipher_suites = w;
 725                         local->wiphy_ciphers_allocated = true;
 726                 }
 727         }
 728
 729         result = wiphy_register(local->hw.wiphy);
 730         if (result < 0)
 731                 goto fail_wiphy_register;
 732
 733         /*
 734          * We use the number of queues for feature tests (QoS, HT) internally
 735          * so restrict them appropriately.
 736          */
 737         if (hw->queues > IEEE80211_MAX_QUEUES)
 738                 hw->queues = IEEE80211_MAX_QUEUES;
 739
 740         local->workqueue =
 741                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 742         if (!local->workqueue) {
 743                 result = -ENOMEM;
 744                 goto fail_workqueue;
 745         }
 746
 747         /*
 748          * The hardware needs headroom for sending the frame,
 749          * and we need some headroom for passing the frame to monitor
 750          * interfaces, but never both at the same time.
 751          */
 752         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 753                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 754         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 755                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 756
 757         debugfs_hw_add(local);
 758
 759         /*
 760          * if the driver doesn't specify a max listen interval we
 761          * use 5 which should be a safe default
 762          */
 763         if (local->hw.max_listen_interval == 0)
 764                 local->hw.max_listen_interval = 5;
 765
 766         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 767
 768         local->dynamic_ps_forced_timeout = -1;
 769
 770         result = sta_info_start(local);
 771         if (result < 0)
 772                 goto fail_sta_info;
 773
 774         result = ieee80211_wep_init(local);
 775         if (result < 0)
 776                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 777                             result);
 778
 779         rtnl_lock();
 780
 781         result = ieee80211_init_rate_ctrl_alg(local,
 782                                               hw->rate_control_algorithm);
 783         if (result < 0) {
 784                 wiphy_debug(local->hw.wiphy,
 785                             "Failed to initialize rate control algorithm\n");
 786                 goto fail_rate;
 787         }
 788
 789         /* add one default STA interface if supported */
 790         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 791                 result = ieee80211_if_add(local, "wlan%d", NULL,
 792                                           NL80211_IFTYPE_STATION, NULL);
 793                 if (result)
 794                         wiphy_warn(local->hw.wiphy,
 795                                    "Failed to add default virtual iface\n");
 796         }
 797
 798         rtnl_unlock();
 799
 800         ieee80211_led_init(local);
 801
 802         local->network_latency_notifier.notifier_call =
 803                 ieee80211_max_network_latency;
 804         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 805                                      &local->network_latency_notifier);
 806         if (result) {
 807                 rtnl_lock();
 808                 goto fail_pm_qos;
 809         }
 810
 811 #ifdef CONFIG_INET
 812         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 813         result = register_inetaddr_notifier(&local->ifa_notifier);
 814         if (result)
 815                 goto fail_ifa;
 816 #endif
 817
 818         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 819                         local->hw.napi_weight);
 820
 821         return 0;
 822
 823 #ifdef CONFIG_INET
 824  fail_ifa:
 825         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 826                                &local->network_latency_notifier);
 827         rtnl_lock();
 828 #endif
 829  fail_pm_qos:
 830         ieee80211_led_exit(local);
 831         ieee80211_remove_interfaces(local);
 832  fail_rate:
 833         rtnl_unlock();
 834         ieee80211_wep_free(local);
 835         sta_info_stop(local);
 836  fail_sta_info:
 837         destroy_workqueue(local->workqueue);
 838  fail_workqueue:
 839         wiphy_unregister(local->hw.wiphy);
 840  fail_wiphy_register:
 841         if (local->wiphy_ciphers_allocated)
 842                 kfree(local->hw.wiphy->cipher_suites);
 843         kfree(local->int_scan_req);
 844         return result;
 845 }
 846 EXPORT_SYMBOL(ieee80211_register_hw);
 847
 848 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 849 {
 850         struct ieee80211_local *local = hw_to_local(hw);
 851
 852         tasklet_kill(&local->tx_pending_tasklet);
 853         tasklet_kill(&local->tasklet);
 854
 855         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 856                                &local->network_latency_notifier);
 857 #ifdef CONFIG_INET
 858         unregister_inetaddr_notifier(&local->ifa_notifier);
 859 #endif
 860
 861         rtnl_lock();
 862
 863         /*
 864          * At this point, interface list manipulations are fine
 865          * because the driver cannot be handing us frames any
 866          * more and the tasklet is killed.
 867          */
 868         ieee80211_remove_interfaces(local);
 869
 870         rtnl_unlock();
 871
 872         /*
 873          * Now all work items will be gone, but the
 874          * timer might still be armed, so delete it
 875          */
 876         del_timer_sync(&local->work_timer);
 877
 878         cancel_work_sync(&local->restart_work);
 879         cancel_work_sync(&local->reconfig_filter);
 880
 881         ieee80211_clear_tx_pending(local);
 882         sta_info_stop(local);
 883         rate_control_deinitialize(local);
 884
 885         if (skb_queue_len(&local->skb_queue) ||
 886             skb_queue_len(&local->skb_queue_unreliable))
 887                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
 888         skb_queue_purge(&local->skb_queue);
 889         skb_queue_purge(&local->skb_queue_unreliable);
 890
 891         destroy_workqueue(local->workqueue);
 892         wiphy_unregister(local->hw.wiphy);
 893         ieee80211_wep_free(local);
 894         ieee80211_led_exit(local);
 895         kfree(local->int_scan_req);
 896 }
 897 EXPORT_SYMBOL(ieee80211_unregister_hw);
 898
 899 void ieee80211_free_hw(struct ieee80211_hw *hw)
 900 {
 901         struct ieee80211_local *local = hw_to_local(hw);
 902
 903         mutex_destroy(&local->iflist_mtx);
 904         mutex_destroy(&local->mtx);
 905
 906         if (local->wiphy_ciphers_allocated)
 907                 kfree(local->hw.wiphy->cipher_suites);
 908
 909         wiphy_free(local->hw.wiphy);
 910 }
 911 EXPORT_SYMBOL(ieee80211_free_hw);
 912
 913 static int __init ieee80211_init(void)
 914 {
 915         struct sk_buff *skb;
 916         int ret;
 917
 918         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 919         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 920                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 921
 922         ret = rc80211_minstrel_init();
 923         if (ret)
 924                 return ret;
 925
 926         ret = rc80211_minstrel_ht_init();
 927         if (ret)
 928                 goto err_minstrel;
 929
 930         ret = rc80211_pid_init();
 931         if (ret)
 932                 goto err_pid;
 933
 934         ret = ieee80211_iface_init();
 935         if (ret)
 936                 goto err_netdev;
 937
 938         return 0;
 939  err_netdev:
 940         rc80211_pid_exit();
 941  err_pid:
 942         rc80211_minstrel_ht_exit();
 943  err_minstrel:
 944         rc80211_minstrel_exit();
 945
 946         return ret;
 947 }
 948
 949 static void __exit ieee80211_exit(void)
 950 {
 951         rc80211_pid_exit();
 952         rc80211_minstrel_ht_exit();
 953         rc80211_minstrel_exit();
 954
 955         /*
 956          * For key todo, it'll be empty by now but the work
 957          * might still be scheduled.
 958          */
 959         flush_scheduled_work();
 960
 961         if (mesh_allocated)
 962                 ieee80211s_stop();
 963
 964         ieee80211_iface_exit();
 965 }
 966
 967
 968 subsys_initcall(ieee80211_init);
 969 module_exit(ieee80211_exit);
 970
 971 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 972 MODULE_LICENSE("GPL");