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