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