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_probe_req || local->probe_req_reg)
  58                 new_flags |= FIF_PROBE_REQ;
  59
  60         if (local->fif_fcsfail)
  61                 new_flags |= FIF_FCSFAIL;
  62
  63         if (local->fif_plcpfail)
  64                 new_flags |= FIF_PLCPFAIL;
  65
  66         if (local->fif_control)
  67                 new_flags |= FIF_CONTROL;
  68
  69         if (local->fif_other_bss)
  70                 new_flags |= FIF_OTHER_BSS;
  71
  72         if (local->fif_pspoll)
  73                 new_flags |= FIF_PSPOLL;
  74
  75         spin_lock_bh(&local->filter_lock);
  76         changed_flags = local->filter_flags ^ new_flags;
  77
  78         mc = drv_prepare_multicast(local, &local->mc_list);
  79         spin_unlock_bh(&local->filter_lock);
  80
  81         /* be a bit nasty */
  82         new_flags |= (1<<31);
  83
  84         drv_configure_filter(local, changed_flags, &new_flags, mc);
  85
  86         WARN_ON(new_flags & (1<<31));
  87
  88         local->filter_flags = new_flags & ~(1<<31);
  89 }
  90
  91 static void ieee80211_reconfig_filter(struct work_struct *work)
  92 {
  93         struct ieee80211_local *local =
  94                 container_of(work, struct ieee80211_local, reconfig_filter);
  95
  96         ieee80211_configure_filter(local);
  97 }
  98
  99 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 100 {
 101         struct ieee80211_channel *chan, *scan_chan;
 102         int ret = 0;
 103         int power;
 104         enum nl80211_channel_type channel_type;
 105         u32 offchannel_flag;
 106
 107         might_sleep();
 108
 109         scan_chan = local->scan_channel;
 110
 111         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 112         if (scan_chan) {
 113                 chan = scan_chan;
 114                 channel_type = NL80211_CHAN_NO_HT;
 115                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 116         } else if (local->tmp_channel &&
 117                    local->oper_channel != local->tmp_channel) {
 118                 chan = scan_chan = local->tmp_channel;
 119                 channel_type = local->tmp_channel_type;
 120                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 121         } else {
 122                 chan = local->oper_channel;
 123                 channel_type = local->_oper_channel_type;
 124                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 125         }
 126         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 127
 128         if (offchannel_flag || chan != local->hw.conf.channel ||
 129             channel_type != local->hw.conf.channel_type) {
 130                 local->hw.conf.channel = chan;
 131                 local->hw.conf.channel_type = channel_type;
 132                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 133         }
 134
 135         if (!conf_is_ht(&local->hw.conf)) {
 136                 /*
 137                  * mac80211.h documents that this is only valid
 138                  * when the channel is set to an HT type, and
 139                  * that otherwise STATIC is used.
 140                  */
 141                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 142         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 143                 local->hw.conf.smps_mode = local->smps_mode;
 144                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 145         }
 146
 147         if (scan_chan)
 148                 power = chan->max_power;
 149         else
 150                 power = local->power_constr_level ?
 151                         (chan->max_power - local->power_constr_level) :
 152                         chan->max_power;
 153
 154         if (local->user_power_level >= 0)
 155                 power = min(power, local->user_power_level);
 156
 157         if (local->hw.conf.power_level != power) {
 158                 changed |= IEEE80211_CONF_CHANGE_POWER;
 159                 local->hw.conf.power_level = power;
 160         }
 161
 162         if (changed && local->open_count) {
 163                 ret = drv_config(local, changed);
 164                 /*
 165                  * Goal:
 166                  * HW reconfiguration should never fail, the driver has told
 167                  * us what it can support so it should live up to that promise.
 168                  *
 169                  * Current status:
 170                  * rfkill is not integrated with mac80211 and a
 171                  * configuration command can thus fail if hardware rfkill
 172                  * is enabled
 173                  *
 174                  * FIXME: integrate rfkill with mac80211 and then add this
 175                  * WARN_ON() back
 176                  *
 177                  */
 178                 /* WARN_ON(ret); */
 179         }
 180
 181         return ret;
 182 }
 183
 184 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 185                                       u32 changed)
 186 {
 187         struct ieee80211_local *local = sdata->local;
 188         static const u8 zero[ETH_ALEN] = { 0 };
 189
 190         if (!changed)
 191                 return;
 192
 193         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 194                 /*
 195                  * While not associated, claim a BSSID of all-zeroes
 196                  * so that drivers don't do any weird things with the
 197                  * BSSID at that time.
 198                  */
 199                 if (sdata->vif.bss_conf.assoc)
 200                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 201                 else
 202                         sdata->vif.bss_conf.bssid = zero;
 203         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 204                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 205         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 206                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 207         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 208                 sdata->vif.bss_conf.bssid = NULL;
 209         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 210                 sdata->vif.bss_conf.bssid = zero;
 211         } else {
 212                 WARN_ON(1);
 213                 return;
 214         }
 215
 216         switch (sdata->vif.type) {
 217         case NL80211_IFTYPE_AP:
 218         case NL80211_IFTYPE_ADHOC:
 219         case NL80211_IFTYPE_WDS:
 220         case NL80211_IFTYPE_MESH_POINT:
 221                 break;
 222         default:
 223                 /* do not warn to simplify caller in scan.c */
 224                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 225                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 226                         return;
 227                 break;
 228         }
 229
 230         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 231                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 232                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 233                         sdata->vif.bss_conf.enable_beacon = false;
 234                 } else {
 235                         /*
 236                          * Beacon should be enabled, but AP mode must
 237                          * check whether there is a beacon configured.
 238                          */
 239                         switch (sdata->vif.type) {
 240                         case NL80211_IFTYPE_AP:
 241                                 sdata->vif.bss_conf.enable_beacon =
 242                                         !!sdata->u.ap.beacon;
 243                                 break;
 244                         case NL80211_IFTYPE_ADHOC:
 245                                 sdata->vif.bss_conf.enable_beacon =
 246                                         !!sdata->u.ibss.presp;
 247                                 break;
 248 #ifdef CONFIG_MAC80211_MESH
 249                         case NL80211_IFTYPE_MESH_POINT:
 250                                 sdata->vif.bss_conf.enable_beacon =
 251                                         !!sdata->u.mesh.mesh_id_len;
 252                                 break;
 253 #endif
 254                         default:
 255                                 /* not reached */
 256                                 WARN_ON(1);
 257                                 break;
 258                         }
 259                 }
 260         }
 261
 262         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 263 }
 264
 265 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 266 {
 267         sdata->vif.bss_conf.use_cts_prot = false;
 268         sdata->vif.bss_conf.use_short_preamble = false;
 269         sdata->vif.bss_conf.use_short_slot = false;
 270         return BSS_CHANGED_ERP_CTS_PROT |
 271                BSS_CHANGED_ERP_PREAMBLE |
 272                BSS_CHANGED_ERP_SLOT;
 273 }
 274
 275 static void ieee80211_tasklet_handler(unsigned long data)
 276 {
 277         struct ieee80211_local *local = (struct ieee80211_local *) data;
 278         struct sk_buff *skb;
 279
 280         while ((skb = skb_dequeue(&local->skb_queue)) ||
 281                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 282                 switch (skb->pkt_type) {
 283                 case IEEE80211_RX_MSG:
 284                         /* Clear skb->pkt_type in order to not confuse kernel
 285                          * netstack. */
 286                         skb->pkt_type = 0;
 287                         ieee80211_rx(local_to_hw(local), skb);
 288                         break;
 289                 case IEEE80211_TX_STATUS_MSG:
 290                         skb->pkt_type = 0;
 291                         ieee80211_tx_status(local_to_hw(local), skb);
 292                         break;
 293                 default:
 294                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 295                              skb->pkt_type);
 296                         dev_kfree_skb(skb);
 297                         break;
 298                 }
 299         }
 300 }
 301
 302 static void ieee80211_restart_work(struct work_struct *work)
 303 {
 304         struct ieee80211_local *local =
 305                 container_of(work, struct ieee80211_local, restart_work);
 306
 307         /* wait for scan work complete */
 308         flush_workqueue(local->workqueue);
 309
 310         mutex_lock(&local->mtx);
 311         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 312                 "%s called with hardware scan in progress\n", __func__);
 313         mutex_unlock(&local->mtx);
 314
 315         rtnl_lock();
 316         ieee80211_scan_cancel(local);
 317         ieee80211_reconfig(local);
 318         rtnl_unlock();
 319 }
 320
 321 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 322 {
 323         struct ieee80211_local *local = hw_to_local(hw);
 324
 325         trace_api_restart_hw(local);
 326
 327         /* use this reason, ieee80211_reconfig will unblock it */
 328         ieee80211_stop_queues_by_reason(hw,
 329                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 330
 331         schedule_work(&local->restart_work);
 332 }
 333 EXPORT_SYMBOL(ieee80211_restart_hw);
 334
 335 static void ieee80211_recalc_smps_work(struct work_struct *work)
 336 {
 337         struct ieee80211_local *local =
 338                 container_of(work, struct ieee80211_local, recalc_smps);
 339
 340         mutex_lock(&local->iflist_mtx);
 341         ieee80211_recalc_smps(local);
 342         mutex_unlock(&local->iflist_mtx);
 343 }
 344
 345 #ifdef CONFIG_INET
 346 static int ieee80211_ifa_changed(struct notifier_block *nb,
 347                                  unsigned long data, void *arg)
 348 {
 349         struct in_ifaddr *ifa = arg;
 350         struct ieee80211_local *local =
 351                 container_of(nb, struct ieee80211_local,
 352                              ifa_notifier);
 353         struct net_device *ndev = ifa->ifa_dev->dev;
 354         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 355         struct in_device *idev;
 356         struct ieee80211_sub_if_data *sdata;
 357         struct ieee80211_bss_conf *bss_conf;
 358         struct ieee80211_if_managed *ifmgd;
 359         int c = 0;
 360
 361         /* Make sure it's our interface that got changed */
 362         if (!wdev)
 363                 return NOTIFY_DONE;
 364
 365         if (wdev->wiphy != local->hw.wiphy)
 366                 return NOTIFY_DONE;
 367
 368         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 369         bss_conf = &sdata->vif.bss_conf;
 370
 371         if (!ieee80211_sdata_running(sdata))
 372                 return NOTIFY_DONE;
 373
 374         /* ARP filtering is only supported in managed mode */
 375         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 376                 return NOTIFY_DONE;
 377
 378         idev = __in_dev_get_rtnl(sdata->dev);
 379         if (!idev)
 380                 return NOTIFY_DONE;
 381
 382         ifmgd = &sdata->u.mgd;
 383         mutex_lock(&ifmgd->mtx);
 384
 385         /* Copy the addresses to the bss_conf list */
 386         ifa = idev->ifa_list;
 387         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 388                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 389                 ifa = ifa->ifa_next;
 390                 c++;
 391         }
 392
 393         /* If not all addresses fit the list, disable filtering */
 394         if (ifa) {
 395                 sdata->arp_filter_state = false;
 396                 c = 0;
 397         } else {
 398                 sdata->arp_filter_state = true;
 399         }
 400         bss_conf->arp_addr_cnt = c;
 401
 402         /* Configure driver only if associated */
 403         if (ifmgd->associated) {
 404                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 405                 ieee80211_bss_info_change_notify(sdata,
 406                                                  BSS_CHANGED_ARP_FILTER);
 407         }
 408
 409         mutex_unlock(&ifmgd->mtx);
 410
 411         return NOTIFY_DONE;
 412 }
 413 #endif
 414
 415 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 416 {
 417         struct ieee80211_local *local =
 418                 container_of(napi, struct ieee80211_local, napi);
 419
 420         return local->ops->napi_poll(&local->hw, budget);
 421 }
 422
 423 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 424 {
 425         struct ieee80211_local *local = hw_to_local(hw);
 426
 427         napi_schedule(&local->napi);
 428 }
 429 EXPORT_SYMBOL(ieee80211_napi_schedule);
 430
 431 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 432 {
 433         struct ieee80211_local *local = hw_to_local(hw);
 434
 435         napi_complete(&local->napi);
 436 }
 437 EXPORT_SYMBOL(ieee80211_napi_complete);
 438
 439 /* There isn't a lot of sense in it, but you can transmit anything you like */
 440 static const struct ieee80211_txrx_stypes
 441 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 442         [NL80211_IFTYPE_ADHOC] = {
 443                 .tx = 0xffff,
 444                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 445         },
 446         [NL80211_IFTYPE_STATION] = {
 447                 .tx = 0xffff,
 448                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 450         },
 451         [NL80211_IFTYPE_AP] = {
 452                 .tx = 0xffff,
 453                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 454                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 455                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 456                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 457                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 458                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 459                         BIT(IEEE80211_STYPE_ACTION >> 4),
 460         },
 461         [NL80211_IFTYPE_AP_VLAN] = {
 462                 /* copy AP */
 463                 .tx = 0xffff,
 464                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 465                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 466                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 467                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 468                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 469                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 470                         BIT(IEEE80211_STYPE_ACTION >> 4),
 471         },
 472         [NL80211_IFTYPE_P2P_CLIENT] = {
 473                 .tx = 0xffff,
 474                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 475                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 476         },
 477         [NL80211_IFTYPE_P2P_GO] = {
 478                 .tx = 0xffff,
 479                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 480                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 481                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 482                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 483                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 484                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 485                         BIT(IEEE80211_STYPE_ACTION >> 4),
 486         },
 487         [NL80211_IFTYPE_MESH_POINT] = {
 488                 .tx = 0xffff,
 489                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 490         },
 491 };
 492
 493 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 494                                         const struct ieee80211_ops *ops)
 495 {
 496         struct ieee80211_local *local;
 497         int priv_size, i;
 498         struct wiphy *wiphy;
 499
 500         /* Ensure 32-byte alignment of our private data and hw private data.
 501          * We use the wiphy priv data for both our ieee80211_local and for
 502          * the driver's private data
 503          *
 504          * In memory it'll be like this:
 505          *
 506          * +-------------------------+
 507          * | struct wiphy           |
 508          * +-------------------------+
 509          * | struct ieee80211_local  |
 510          * +-------------------------+
 511          * | driver's private data   |
 512          * +-------------------------+
 513          *
 514          */
 515         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 516
 517         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 518
 519         if (!wiphy)
 520                 return NULL;
 521
 522         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 523
 524         wiphy->privid = mac80211_wiphy_privid;
 525
 526         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 527                         WIPHY_FLAG_4ADDR_AP |
 528                         WIPHY_FLAG_4ADDR_STATION |
 529                         WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS;
 530
 531         if (!ops->set_key)
 532                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 533
 534         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 535
 536         local = wiphy_priv(wiphy);
 537
 538         local->hw.wiphy = wiphy;
 539
 540         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 541
 542         BUG_ON(!ops->tx);
 543         BUG_ON(!ops->start);
 544         BUG_ON(!ops->stop);
 545         BUG_ON(!ops->config);
 546         BUG_ON(!ops->add_interface);
 547         BUG_ON(!ops->remove_interface);
 548         BUG_ON(!ops->configure_filter);
 549         local->ops = ops;
 550
 551         /* set up some defaults */
 552         local->hw.queues = 1;
 553         local->hw.max_rates = 1;
 554         local->hw.max_report_rates = 0;
 555         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 556         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 557         local->user_power_level = -1;
 558         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 559         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 560
 561         INIT_LIST_HEAD(&local->interfaces);
 562
 563         __hw_addr_init(&local->mc_list);
 564
 565         mutex_init(&local->iflist_mtx);
 566         mutex_init(&local->mtx);
 567
 568         mutex_init(&local->key_mtx);
 569         spin_lock_init(&local->filter_lock);
 570         spin_lock_init(&local->queue_stop_reason_lock);
 571
 572         skb_queue_head_init(&local->rx_skb_queue);
 573
 574         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 575
 576         ieee80211_work_init(local);
 577
 578         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 579
 580         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 581         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 582         local->smps_mode = IEEE80211_SMPS_OFF;
 583
 584         INIT_WORK(&local->dynamic_ps_enable_work,
 585                   ieee80211_dynamic_ps_enable_work);
 586         INIT_WORK(&local->dynamic_ps_disable_work,
 587                   ieee80211_dynamic_ps_disable_work);
 588         setup_timer(&local->dynamic_ps_timer,
 589                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 590
 591         sta_info_init(local);
 592
 593         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 594                 skb_queue_head_init(&local->pending[i]);
 595                 atomic_set(&local->agg_queue_stop[i], 0);
 596         }
 597         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 598                      (unsigned long)local);
 599
 600         tasklet_init(&local->tasklet,
 601                      ieee80211_tasklet_handler,
 602                      (unsigned long) local);
 603
 604         skb_queue_head_init(&local->skb_queue);
 605         skb_queue_head_init(&local->skb_queue_unreliable);
 606
 607         /* init dummy netdev for use w/ NAPI */
 608         init_dummy_netdev(&local->napi_dev);
 609
 610         return local_to_hw(local);
 611 }
 612 EXPORT_SYMBOL(ieee80211_alloc_hw);
 613
 614 int ieee80211_register_hw(struct ieee80211_hw *hw)
 615 {
 616         struct ieee80211_local *local = hw_to_local(hw);
 617         int result;
 618         enum ieee80211_band band;
 619         int channels, max_bitrates;
 620         bool supp_ht;
 621         static const u32 cipher_suites[] = {
 622                 /* keep WEP first, it may be removed below */
 623                 WLAN_CIPHER_SUITE_WEP40,
 624                 WLAN_CIPHER_SUITE_WEP104,
 625                 WLAN_CIPHER_SUITE_TKIP,
 626                 WLAN_CIPHER_SUITE_CCMP,
 627
 628                 /* keep last -- depends on hw flags! */
 629                 WLAN_CIPHER_SUITE_AES_CMAC
 630         };
 631
 632         if (hw->max_report_rates == 0)
 633                 hw->max_report_rates = hw->max_rates;
 634
 635         /*
 636          * generic code guarantees at least one band,
 637          * set this very early because much code assumes
 638          * that hw.conf.channel is assigned
 639          */
 640         channels = 0;
 641         max_bitrates = 0;
 642         supp_ht = false;
 643         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 644                 struct ieee80211_supported_band *sband;
 645
 646                 sband = local->hw.wiphy->bands[band];
 647                 if (!sband)
 648                         continue;
 649                 if (!local->oper_channel) {
 650                         /* init channel we're on */
 651                         local->hw.conf.channel =
 652                         local->oper_channel = &sband->channels[0];
 653                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 654                 }
 655                 channels += sband->n_channels;
 656
 657                 if (max_bitrates < sband->n_bitrates)
 658                         max_bitrates = sband->n_bitrates;
 659                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 660         }
 661
 662         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 663                                       sizeof(void *) * channels, GFP_KERNEL);
 664         if (!local->int_scan_req)
 665                 return -ENOMEM;
 666
 667         /* if low-level driver supports AP, we also support VLAN */
 668         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 669                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 670
 671         /* mac80211 always supports monitor */
 672         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 673
 674 #ifndef CONFIG_MAC80211_MESH
 675         /* mesh depends on Kconfig, but drivers should set it if they want */
 676         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 677 #endif
 678
 679         /* mac80211 supports control port protocol changing */
 680         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 681
 682         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 683                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 684         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 685                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 686
 687         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 688              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 689              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 690
 691         /*
 692          * Calculate scan IE length -- we need this to alloc
 693          * memory and to subtract from the driver limit. It
 694          * includes the DS Params, (extended) supported rates, and HT
 695          * information -- SSID is the driver's responsibility.
 696          */
 697         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 698                 3 /* DS Params */;
 699         if (supp_ht)
 700                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 701
 702         if (!local->ops->hw_scan) {
 703                 /* For hw_scan, driver needs to set these up. */
 704                 local->hw.wiphy->max_scan_ssids = 4;
 705                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 706         }
 707
 708         /*
 709          * If the driver supports any scan IEs, then assume the
 710          * limit includes the IEs mac80211 will add, otherwise
 711          * leave it at zero and let the driver sort it out; we
 712          * still pass our IEs to the driver but userspace will
 713          * not be allowed to in that case.
 714          */
 715         if (local->hw.wiphy->max_scan_ie_len)
 716                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 717
 718         /* Set up cipher suites unless driver already did */
 719         if (!local->hw.wiphy->cipher_suites) {
 720                 local->hw.wiphy->cipher_suites = cipher_suites;
 721                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 722                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 723                         local->hw.wiphy->n_cipher_suites--;
 724         }
 725         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 726                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 727                         local->hw.wiphy->cipher_suites += 2;
 728                         local->hw.wiphy->n_cipher_suites -= 2;
 729                 } else {
 730                         u32 *suites;
 731                         int r, w = 0;
 732
 733                         /* Filter out WEP */
 734
 735                         suites = kmemdup(
 736                                 local->hw.wiphy->cipher_suites,
 737                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 738                                 GFP_KERNEL);
 739                         if (!suites)
 740                                 return -ENOMEM;
 741                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 742                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 743                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 744                                     suite == WLAN_CIPHER_SUITE_WEP104)
 745                                         continue;
 746                                 suites[w++] = suite;
 747                         }
 748                         local->hw.wiphy->cipher_suites = suites;
 749                         local->hw.wiphy->n_cipher_suites = w;
 750                         local->wiphy_ciphers_allocated = true;
 751                 }
 752         }
 753
 754         local->hw.wiphy->max_remain_on_channel_duration = 5000;
 755
 756         result = wiphy_register(local->hw.wiphy);
 757         if (result < 0)
 758                 goto fail_wiphy_register;
 759
 760         /*
 761          * We use the number of queues for feature tests (QoS, HT) internally
 762          * so restrict them appropriately.
 763          */
 764         if (hw->queues > IEEE80211_MAX_QUEUES)
 765                 hw->queues = IEEE80211_MAX_QUEUES;
 766
 767         local->workqueue =
 768                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 769         if (!local->workqueue) {
 770                 result = -ENOMEM;
 771                 goto fail_workqueue;
 772         }
 773
 774         /*
 775          * The hardware needs headroom for sending the frame,
 776          * and we need some headroom for passing the frame to monitor
 777          * interfaces, but never both at the same time.
 778          */
 779         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 780                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 781         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 782                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 783
 784         debugfs_hw_add(local);
 785
 786         /*
 787          * if the driver doesn't specify a max listen interval we
 788          * use 5 which should be a safe default
 789          */
 790         if (local->hw.max_listen_interval == 0)
 791                 local->hw.max_listen_interval = 5;
 792
 793         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 794
 795         local->dynamic_ps_forced_timeout = -1;
 796
 797         result = sta_info_start(local);
 798         if (result < 0)
 799                 goto fail_sta_info;
 800
 801         result = ieee80211_wep_init(local);
 802         if (result < 0)
 803                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 804                             result);
 805
 806         rtnl_lock();
 807
 808         result = ieee80211_init_rate_ctrl_alg(local,
 809                                               hw->rate_control_algorithm);
 810         if (result < 0) {
 811                 wiphy_debug(local->hw.wiphy,
 812                             "Failed to initialize rate control algorithm\n");
 813                 goto fail_rate;
 814         }
 815
 816         /* add one default STA interface if supported */
 817         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 818                 result = ieee80211_if_add(local, "wlan%d", NULL,
 819                                           NL80211_IFTYPE_STATION, NULL);
 820                 if (result)
 821                         wiphy_warn(local->hw.wiphy,
 822                                    "Failed to add default virtual iface\n");
 823         }
 824
 825         rtnl_unlock();
 826
 827         ieee80211_led_init(local);
 828
 829         local->network_latency_notifier.notifier_call =
 830                 ieee80211_max_network_latency;
 831         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 832                                      &local->network_latency_notifier);
 833         if (result) {
 834                 rtnl_lock();
 835                 goto fail_pm_qos;
 836         }
 837
 838 #ifdef CONFIG_INET
 839         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 840         result = register_inetaddr_notifier(&local->ifa_notifier);
 841         if (result)
 842                 goto fail_ifa;
 843 #endif
 844
 845         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 846                         local->hw.napi_weight);
 847
 848         return 0;
 849
 850 #ifdef CONFIG_INET
 851  fail_ifa:
 852         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 853                                &local->network_latency_notifier);
 854         rtnl_lock();
 855 #endif
 856  fail_pm_qos:
 857         ieee80211_led_exit(local);
 858         ieee80211_remove_interfaces(local);
 859  fail_rate:
 860         rtnl_unlock();
 861         ieee80211_wep_free(local);
 862         sta_info_stop(local);
 863  fail_sta_info:
 864         destroy_workqueue(local->workqueue);
 865  fail_workqueue:
 866         wiphy_unregister(local->hw.wiphy);
 867  fail_wiphy_register:
 868         if (local->wiphy_ciphers_allocated)
 869                 kfree(local->hw.wiphy->cipher_suites);
 870         kfree(local->int_scan_req);
 871         return result;
 872 }
 873 EXPORT_SYMBOL(ieee80211_register_hw);
 874
 875 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 876 {
 877         struct ieee80211_local *local = hw_to_local(hw);
 878
 879         tasklet_kill(&local->tx_pending_tasklet);
 880         tasklet_kill(&local->tasklet);
 881
 882         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 883                                &local->network_latency_notifier);
 884 #ifdef CONFIG_INET
 885         unregister_inetaddr_notifier(&local->ifa_notifier);
 886 #endif
 887
 888         rtnl_lock();
 889
 890         /*
 891          * At this point, interface list manipulations are fine
 892          * because the driver cannot be handing us frames any
 893          * more and the tasklet is killed.
 894          */
 895         ieee80211_remove_interfaces(local);
 896
 897         rtnl_unlock();
 898
 899         /*
 900          * Now all work items will be gone, but the
 901          * timer might still be armed, so delete it
 902          */
 903         del_timer_sync(&local->work_timer);
 904
 905         cancel_work_sync(&local->restart_work);
 906         cancel_work_sync(&local->reconfig_filter);
 907
 908         ieee80211_clear_tx_pending(local);
 909         sta_info_stop(local);
 910         rate_control_deinitialize(local);
 911
 912         if (skb_queue_len(&local->skb_queue) ||
 913             skb_queue_len(&local->skb_queue_unreliable))
 914                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
 915         skb_queue_purge(&local->skb_queue);
 916         skb_queue_purge(&local->skb_queue_unreliable);
 917         skb_queue_purge(&local->rx_skb_queue);
 918
 919         destroy_workqueue(local->workqueue);
 920         wiphy_unregister(local->hw.wiphy);
 921         ieee80211_wep_free(local);
 922         ieee80211_led_exit(local);
 923         kfree(local->int_scan_req);
 924 }
 925 EXPORT_SYMBOL(ieee80211_unregister_hw);
 926
 927 void ieee80211_free_hw(struct ieee80211_hw *hw)
 928 {
 929         struct ieee80211_local *local = hw_to_local(hw);
 930
 931         mutex_destroy(&local->iflist_mtx);
 932         mutex_destroy(&local->mtx);
 933
 934         if (local->wiphy_ciphers_allocated)
 935                 kfree(local->hw.wiphy->cipher_suites);
 936
 937         wiphy_free(local->hw.wiphy);
 938 }
 939 EXPORT_SYMBOL(ieee80211_free_hw);
 940
 941 static int __init ieee80211_init(void)
 942 {
 943         struct sk_buff *skb;
 944         int ret;
 945
 946         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 947         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 948                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 949
 950         ret = rc80211_minstrel_init();
 951         if (ret)
 952                 return ret;
 953
 954         ret = rc80211_minstrel_ht_init();
 955         if (ret)
 956                 goto err_minstrel;
 957
 958         ret = rc80211_pid_init();
 959         if (ret)
 960                 goto err_pid;
 961
 962         ret = ieee80211_iface_init();
 963         if (ret)
 964                 goto err_netdev;
 965
 966         return 0;
 967  err_netdev:
 968         rc80211_pid_exit();
 969  err_pid:
 970         rc80211_minstrel_ht_exit();
 971  err_minstrel:
 972         rc80211_minstrel_exit();
 973
 974         return ret;
 975 }
 976
 977 static void __exit ieee80211_exit(void)
 978 {
 979         rc80211_pid_exit();
 980         rc80211_minstrel_ht_exit();
 981         rc80211_minstrel_exit();
 982
 983         if (mesh_allocated)
 984                 ieee80211s_stop();
 985
 986         ieee80211_iface_exit();
 987 }
 988
 989
 990 subsys_initcall(ieee80211_init);
 991 module_exit(ieee80211_exit);
 992
 993 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 994 MODULE_LICENSE("GPL");