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.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 static struct lock_class_key ieee80211_rx_skb_queue_class;
  37
  38 void ieee80211_configure_filter(struct ieee80211_local *local)
  39 {
  40         u64 mc;
  41         unsigned int changed_flags;
  42         unsigned int new_flags = 0;
  43
  44         if (atomic_read(&local->iff_promiscs))
  45                 new_flags |= FIF_PROMISC_IN_BSS;
  46
  47         if (atomic_read(&local->iff_allmultis))
  48                 new_flags |= FIF_ALLMULTI;
  49
  50         if (local->monitors || local->scanning)
  51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  52
  53         if (local->fif_probe_req || local->probe_req_reg)
  54                 new_flags |= FIF_PROBE_REQ;
  55
  56         if (local->fif_fcsfail)
  57                 new_flags |= FIF_FCSFAIL;
  58
  59         if (local->fif_plcpfail)
  60                 new_flags |= FIF_PLCPFAIL;
  61
  62         if (local->fif_control)
  63                 new_flags |= FIF_CONTROL;
  64
  65         if (local->fif_other_bss)
  66                 new_flags |= FIF_OTHER_BSS;
  67
  68         if (local->fif_pspoll)
  69                 new_flags |= FIF_PSPOLL;
  70
  71         spin_lock_bh(&local->filter_lock);
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         mc = drv_prepare_multicast(local, &local->mc_list);
  75         spin_unlock_bh(&local->filter_lock);
  76
  77         /* be a bit nasty */
  78         new_flags |= (1<<31);
  79
  80         drv_configure_filter(local, changed_flags, &new_flags, mc);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 static void ieee80211_reconfig_filter(struct work_struct *work)
  88 {
  89         struct ieee80211_local *local =
  90                 container_of(work, struct ieee80211_local, reconfig_filter);
  91
  92         ieee80211_configure_filter(local);
  93 }
  94
  95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  96 {
  97         struct ieee80211_channel *chan, *scan_chan;
  98         int ret = 0;
  99         int power;
 100         enum nl80211_channel_type channel_type;
 101         u32 offchannel_flag;
 102
 103         might_sleep();
 104
 105         scan_chan = local->scan_channel;
 106
 107         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 108         if (scan_chan) {
 109                 chan = scan_chan;
 110                 /* If scanning on oper channel, use whatever channel-type
 111                  * is currently in use.
 112                  */
 113                 if (chan == local->oper_channel)
 114                         channel_type = local->_oper_channel_type;
 115                 else
 116                         channel_type = NL80211_CHAN_NO_HT;
 117                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 118         } else if (local->tmp_channel &&
 119                    local->oper_channel != local->tmp_channel) {
 120                 chan = scan_chan = local->tmp_channel;
 121                 channel_type = local->tmp_channel_type;
 122                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 123         } else {
 124                 chan = local->oper_channel;
 125                 channel_type = local->_oper_channel_type;
 126                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 127         }
 128
 129         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 130
 131         if (offchannel_flag || chan != local->hw.conf.channel ||
 132             channel_type != local->hw.conf.channel_type) {
 133                 local->hw.conf.channel = chan;
 134                 local->hw.conf.channel_type = channel_type;
 135                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 136         }
 137
 138         if (!conf_is_ht(&local->hw.conf)) {
 139                 /*
 140                  * mac80211.h documents that this is only valid
 141                  * when the channel is set to an HT type, and
 142                  * that otherwise STATIC is used.
 143                  */
 144                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 145         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 146                 local->hw.conf.smps_mode = local->smps_mode;
 147                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 148         }
 149
 150         if ((local->scanning & SCAN_SW_SCANNING) ||
 151             (local->scanning & SCAN_HW_SCANNING))
 152                 power = chan->max_power;
 153         else
 154                 power = local->power_constr_level ?
 155                         (chan->max_power - local->power_constr_level) :
 156                         chan->max_power;
 157
 158         if (local->user_power_level >= 0)
 159                 power = min(power, local->user_power_level);
 160
 161         if (local->hw.conf.power_level != power) {
 162                 changed |= IEEE80211_CONF_CHANGE_POWER;
 163                 local->hw.conf.power_level = power;
 164         }
 165
 166         if (changed && local->open_count) {
 167                 ret = drv_config(local, changed);
 168                 /*
 169                  * Goal:
 170                  * HW reconfiguration should never fail, the driver has told
 171                  * us what it can support so it should live up to that promise.
 172                  *
 173                  * Current status:
 174                  * rfkill is not integrated with mac80211 and a
 175                  * configuration command can thus fail if hardware rfkill
 176                  * is enabled
 177                  *
 178                  * FIXME: integrate rfkill with mac80211 and then add this
 179                  * WARN_ON() back
 180                  *
 181                  */
 182                 /* WARN_ON(ret); */
 183         }
 184
 185         return ret;
 186 }
 187
 188 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 189                                       u32 changed)
 190 {
 191         struct ieee80211_local *local = sdata->local;
 192         static const u8 zero[ETH_ALEN] = { 0 };
 193
 194         if (!changed)
 195                 return;
 196
 197         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 198                 /*
 199                  * While not associated, claim a BSSID of all-zeroes
 200                  * so that drivers don't do any weird things with the
 201                  * BSSID at that time.
 202                  */
 203                 if (sdata->vif.bss_conf.assoc)
 204                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 205                 else
 206                         sdata->vif.bss_conf.bssid = zero;
 207         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 208                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 209         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 210                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 211         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 212                 sdata->vif.bss_conf.bssid = NULL;
 213         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 214                 sdata->vif.bss_conf.bssid = zero;
 215         } else {
 216                 WARN_ON(1);
 217                 return;
 218         }
 219
 220         switch (sdata->vif.type) {
 221         case NL80211_IFTYPE_AP:
 222         case NL80211_IFTYPE_ADHOC:
 223         case NL80211_IFTYPE_WDS:
 224         case NL80211_IFTYPE_MESH_POINT:
 225                 break;
 226         default:
 227                 /* do not warn to simplify caller in scan.c */
 228                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 229                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 230                         return;
 231                 break;
 232         }
 233
 234         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 235                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 236                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 237                         sdata->vif.bss_conf.enable_beacon = false;
 238                 } else {
 239                         /*
 240                          * Beacon should be enabled, but AP mode must
 241                          * check whether there is a beacon configured.
 242                          */
 243                         switch (sdata->vif.type) {
 244                         case NL80211_IFTYPE_AP:
 245                                 sdata->vif.bss_conf.enable_beacon =
 246                                         !!sdata->u.ap.beacon;
 247                                 break;
 248                         case NL80211_IFTYPE_ADHOC:
 249                                 sdata->vif.bss_conf.enable_beacon =
 250                                         !!sdata->u.ibss.presp;
 251                                 break;
 252 #ifdef CONFIG_MAC80211_MESH
 253                         case NL80211_IFTYPE_MESH_POINT:
 254                                 sdata->vif.bss_conf.enable_beacon =
 255                                         !!sdata->u.mesh.mesh_id_len;
 256                                 break;
 257 #endif
 258                         default:
 259                                 /* not reached */
 260                                 WARN_ON(1);
 261                                 break;
 262                         }
 263                 }
 264         }
 265
 266         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 267 }
 268
 269 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 270 {
 271         sdata->vif.bss_conf.use_cts_prot = false;
 272         sdata->vif.bss_conf.use_short_preamble = false;
 273         sdata->vif.bss_conf.use_short_slot = false;
 274         return BSS_CHANGED_ERP_CTS_PROT |
 275                BSS_CHANGED_ERP_PREAMBLE |
 276                BSS_CHANGED_ERP_SLOT;
 277 }
 278
 279 static void ieee80211_tasklet_handler(unsigned long data)
 280 {
 281         struct ieee80211_local *local = (struct ieee80211_local *) data;
 282         struct sta_info *sta, *tmp;
 283         struct skb_eosp_msg_data *eosp_data;
 284         struct sk_buff *skb;
 285
 286         while ((skb = skb_dequeue(&local->skb_queue)) ||
 287                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 288                 switch (skb->pkt_type) {
 289                 case IEEE80211_RX_MSG:
 290                         /* Clear skb->pkt_type in order to not confuse kernel
 291                          * netstack. */
 292                         skb->pkt_type = 0;
 293                         ieee80211_rx(local_to_hw(local), skb);
 294                         break;
 295                 case IEEE80211_TX_STATUS_MSG:
 296                         skb->pkt_type = 0;
 297                         ieee80211_tx_status(local_to_hw(local), skb);
 298                         break;
 299                 case IEEE80211_EOSP_MSG:
 300                         eosp_data = (void *)skb->cb;
 301                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 302                                 /* skip wrong virtual interface */
 303                                 if (memcmp(eosp_data->iface,
 304                                            sta->sdata->vif.addr, ETH_ALEN))
 305                                         continue;
 306                                 clear_sta_flag(sta, WLAN_STA_SP);
 307                                 break;
 308                         }
 309                         dev_kfree_skb(skb);
 310                         break;
 311                 default:
 312                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 313                              skb->pkt_type);
 314                         dev_kfree_skb(skb);
 315                         break;
 316                 }
 317         }
 318 }
 319
 320 static void ieee80211_restart_work(struct work_struct *work)
 321 {
 322         struct ieee80211_local *local =
 323                 container_of(work, struct ieee80211_local, restart_work);
 324
 325         /* wait for scan work complete */
 326         flush_workqueue(local->workqueue);
 327
 328         mutex_lock(&local->mtx);
 329         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 330              local->sched_scanning,
 331                 "%s called with hardware scan in progress\n", __func__);
 332         mutex_unlock(&local->mtx);
 333
 334         rtnl_lock();
 335         ieee80211_scan_cancel(local);
 336         ieee80211_reconfig(local);
 337         rtnl_unlock();
 338 }
 339
 340 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 341 {
 342         struct ieee80211_local *local = hw_to_local(hw);
 343
 344         trace_api_restart_hw(local);
 345
 346         wiphy_info(hw->wiphy,
 347                    "Hardware restart was requested\n");
 348
 349         /* use this reason, ieee80211_reconfig will unblock it */
 350         ieee80211_stop_queues_by_reason(hw,
 351                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 352
 353         schedule_work(&local->restart_work);
 354 }
 355 EXPORT_SYMBOL(ieee80211_restart_hw);
 356
 357 static void ieee80211_recalc_smps_work(struct work_struct *work)
 358 {
 359         struct ieee80211_local *local =
 360                 container_of(work, struct ieee80211_local, recalc_smps);
 361
 362         mutex_lock(&local->iflist_mtx);
 363         ieee80211_recalc_smps(local);
 364         mutex_unlock(&local->iflist_mtx);
 365 }
 366
 367 #ifdef CONFIG_INET
 368 static int ieee80211_ifa_changed(struct notifier_block *nb,
 369                                  unsigned long data, void *arg)
 370 {
 371         struct in_ifaddr *ifa = arg;
 372         struct ieee80211_local *local =
 373                 container_of(nb, struct ieee80211_local,
 374                              ifa_notifier);
 375         struct net_device *ndev = ifa->ifa_dev->dev;
 376         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 377         struct in_device *idev;
 378         struct ieee80211_sub_if_data *sdata;
 379         struct ieee80211_bss_conf *bss_conf;
 380         struct ieee80211_if_managed *ifmgd;
 381         int c = 0;
 382
 383         /* Make sure it's our interface that got changed */
 384         if (!wdev)
 385                 return NOTIFY_DONE;
 386
 387         if (wdev->wiphy != local->hw.wiphy)
 388                 return NOTIFY_DONE;
 389
 390         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 391         bss_conf = &sdata->vif.bss_conf;
 392
 393         if (!ieee80211_sdata_running(sdata))
 394                 return NOTIFY_DONE;
 395
 396         /* ARP filtering is only supported in managed mode */
 397         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 398                 return NOTIFY_DONE;
 399
 400         idev = __in_dev_get_rtnl(sdata->dev);
 401         if (!idev)
 402                 return NOTIFY_DONE;
 403
 404         ifmgd = &sdata->u.mgd;
 405         mutex_lock(&ifmgd->mtx);
 406
 407         /* Copy the addresses to the bss_conf list */
 408         ifa = idev->ifa_list;
 409         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 410                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 411                 ifa = ifa->ifa_next;
 412                 c++;
 413         }
 414
 415         /* If not all addresses fit the list, disable filtering */
 416         if (ifa) {
 417                 sdata->arp_filter_state = false;
 418                 c = 0;
 419         } else {
 420                 sdata->arp_filter_state = true;
 421         }
 422         bss_conf->arp_addr_cnt = c;
 423
 424         /* Configure driver only if associated */
 425         if (ifmgd->associated) {
 426                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 427                 ieee80211_bss_info_change_notify(sdata,
 428                                                  BSS_CHANGED_ARP_FILTER);
 429         }
 430
 431         mutex_unlock(&ifmgd->mtx);
 432
 433         return NOTIFY_DONE;
 434 }
 435 #endif
 436
 437 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 438 {
 439         struct ieee80211_local *local =
 440                 container_of(napi, struct ieee80211_local, napi);
 441
 442         return local->ops->napi_poll(&local->hw, budget);
 443 }
 444
 445 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 446 {
 447         struct ieee80211_local *local = hw_to_local(hw);
 448
 449         napi_schedule(&local->napi);
 450 }
 451 EXPORT_SYMBOL(ieee80211_napi_schedule);
 452
 453 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 454 {
 455         struct ieee80211_local *local = hw_to_local(hw);
 456
 457         napi_complete(&local->napi);
 458 }
 459 EXPORT_SYMBOL(ieee80211_napi_complete);
 460
 461 /* There isn't a lot of sense in it, but you can transmit anything you like */
 462 static const struct ieee80211_txrx_stypes
 463 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 464         [NL80211_IFTYPE_ADHOC] = {
 465                 .tx = 0xffff,
 466                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 467         },
 468         [NL80211_IFTYPE_STATION] = {
 469                 .tx = 0xffff,
 470                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 471                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 472         },
 473         [NL80211_IFTYPE_AP] = {
 474                 .tx = 0xffff,
 475                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 476                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 477                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 478                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 479                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 480                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 481                         BIT(IEEE80211_STYPE_ACTION >> 4),
 482         },
 483         [NL80211_IFTYPE_AP_VLAN] = {
 484                 /* copy AP */
 485                 .tx = 0xffff,
 486                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 487                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 488                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 489                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 490                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 491                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 492                         BIT(IEEE80211_STYPE_ACTION >> 4),
 493         },
 494         [NL80211_IFTYPE_P2P_CLIENT] = {
 495                 .tx = 0xffff,
 496                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 497                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 498         },
 499         [NL80211_IFTYPE_P2P_GO] = {
 500                 .tx = 0xffff,
 501                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 502                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 504                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 505                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 506                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 507                         BIT(IEEE80211_STYPE_ACTION >> 4),
 508         },
 509         [NL80211_IFTYPE_MESH_POINT] = {
 510                 .tx = 0xffff,
 511                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 512                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 513                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 514         },
 515 };
 516
 517 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 518                                         const struct ieee80211_ops *ops)
 519 {
 520         struct ieee80211_local *local;
 521         int priv_size, i;
 522         struct wiphy *wiphy;
 523
 524         /* Ensure 32-byte alignment of our private data and hw private data.
 525          * We use the wiphy priv data for both our ieee80211_local and for
 526          * the driver's private data
 527          *
 528          * In memory it'll be like this:
 529          *
 530          * +-------------------------+
 531          * | struct wiphy           |
 532          * +-------------------------+
 533          * | struct ieee80211_local  |
 534          * +-------------------------+
 535          * | driver's private data   |
 536          * +-------------------------+
 537          *
 538          */
 539         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 540
 541         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 542
 543         if (!wiphy)
 544                 return NULL;
 545
 546         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 547
 548         wiphy->privid = mac80211_wiphy_privid;
 549
 550         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 551                         WIPHY_FLAG_4ADDR_AP |
 552                         WIPHY_FLAG_4ADDR_STATION;
 553
 554         if (!ops->set_key)
 555                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 556
 557         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 558
 559         local = wiphy_priv(wiphy);
 560
 561         local->hw.wiphy = wiphy;
 562
 563         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 564
 565         BUG_ON(!ops->tx);
 566         BUG_ON(!ops->start);
 567         BUG_ON(!ops->stop);
 568         BUG_ON(!ops->config);
 569         BUG_ON(!ops->add_interface);
 570         BUG_ON(!ops->remove_interface);
 571         BUG_ON(!ops->configure_filter);
 572         local->ops = ops;
 573
 574         /* set up some defaults */
 575         local->hw.queues = 1;
 576         local->hw.max_rates = 1;
 577         local->hw.max_report_rates = 0;
 578         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 579         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 580         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 581         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 582         local->user_power_level = -1;
 583         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 584         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 585
 586         INIT_LIST_HEAD(&local->interfaces);
 587
 588         __hw_addr_init(&local->mc_list);
 589
 590         mutex_init(&local->iflist_mtx);
 591         mutex_init(&local->mtx);
 592
 593         mutex_init(&local->key_mtx);
 594         spin_lock_init(&local->filter_lock);
 595         spin_lock_init(&local->queue_stop_reason_lock);
 596
 597         /*
 598          * The rx_skb_queue is only accessed from tasklets,
 599          * but other SKB queues are used from within IRQ
 600          * context. Therefore, this one needs a different
 601          * locking class so our direct, non-irq-safe use of
 602          * the queue's lock doesn't throw lockdep warnings.
 603          */
 604         skb_queue_head_init_class(&local->rx_skb_queue,
 605                                   &ieee80211_rx_skb_queue_class);
 606
 607         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 608
 609         ieee80211_work_init(local);
 610
 611         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 612
 613         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 614         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 615         local->smps_mode = IEEE80211_SMPS_OFF;
 616
 617         INIT_WORK(&local->dynamic_ps_enable_work,
 618                   ieee80211_dynamic_ps_enable_work);
 619         INIT_WORK(&local->dynamic_ps_disable_work,
 620                   ieee80211_dynamic_ps_disable_work);
 621         setup_timer(&local->dynamic_ps_timer,
 622                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 623
 624         INIT_WORK(&local->sched_scan_stopped_work,
 625                   ieee80211_sched_scan_stopped_work);
 626
 627         sta_info_init(local);
 628
 629         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 630                 skb_queue_head_init(&local->pending[i]);
 631                 atomic_set(&local->agg_queue_stop[i], 0);
 632         }
 633         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 634                      (unsigned long)local);
 635
 636         tasklet_init(&local->tasklet,
 637                      ieee80211_tasklet_handler,
 638                      (unsigned long) local);
 639
 640         skb_queue_head_init(&local->skb_queue);
 641         skb_queue_head_init(&local->skb_queue_unreliable);
 642
 643         /* init dummy netdev for use w/ NAPI */
 644         init_dummy_netdev(&local->napi_dev);
 645
 646         ieee80211_led_names(local);
 647
 648         ieee80211_hw_roc_setup(local);
 649
 650         return local_to_hw(local);
 651 }
 652 EXPORT_SYMBOL(ieee80211_alloc_hw);
 653
 654 int ieee80211_register_hw(struct ieee80211_hw *hw)
 655 {
 656         struct ieee80211_local *local = hw_to_local(hw);
 657         int result, i;
 658         enum ieee80211_band band;
 659         int channels, max_bitrates;
 660         bool supp_ht;
 661         static const u32 cipher_suites[] = {
 662                 /* keep WEP first, it may be removed below */
 663                 WLAN_CIPHER_SUITE_WEP40,
 664                 WLAN_CIPHER_SUITE_WEP104,
 665                 WLAN_CIPHER_SUITE_TKIP,
 666                 WLAN_CIPHER_SUITE_CCMP,
 667
 668                 /* keep last -- depends on hw flags! */
 669                 WLAN_CIPHER_SUITE_AES_CMAC
 670         };
 671
 672         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 673 #ifdef CONFIG_PM
 674             && (!local->ops->suspend || !local->ops->resume)
 675 #endif
 676             )
 677                 return -EINVAL;
 678
 679         if (hw->max_report_rates == 0)
 680                 hw->max_report_rates = hw->max_rates;
 681
 682         /*
 683          * generic code guarantees at least one band,
 684          * set this very early because much code assumes
 685          * that hw.conf.channel is assigned
 686          */
 687         channels = 0;
 688         max_bitrates = 0;
 689         supp_ht = false;
 690         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 691                 struct ieee80211_supported_band *sband;
 692
 693                 sband = local->hw.wiphy->bands[band];
 694                 if (!sband)
 695                         continue;
 696                 if (!local->oper_channel) {
 697                         /* init channel we're on */
 698                         local->hw.conf.channel =
 699                         local->oper_channel = &sband->channels[0];
 700                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 701                 }
 702                 channels += sband->n_channels;
 703
 704                 if (max_bitrates < sband->n_bitrates)
 705                         max_bitrates = sband->n_bitrates;
 706                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 707         }
 708
 709         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 710                                       sizeof(void *) * channels, GFP_KERNEL);
 711         if (!local->int_scan_req)
 712                 return -ENOMEM;
 713
 714         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 715                 if (!local->hw.wiphy->bands[band])
 716                         continue;
 717                 local->int_scan_req->rates[band] = (u32) -1;
 718         }
 719
 720         /* if low-level driver supports AP, we also support VLAN */
 721         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 722                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 723                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 724         }
 725
 726         /* mac80211 always supports monitor */
 727         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 728         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 729
 730         /*
 731          * mac80211 doesn't support more than 1 channel, and also not more
 732          * than one IBSS interface
 733          */
 734         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 735                 const struct ieee80211_iface_combination *c;
 736                 int j;
 737
 738                 c = &hw->wiphy->iface_combinations[i];
 739
 740                 if (c->num_different_channels > 1)
 741                         return -EINVAL;
 742
 743                 for (j = 0; j < c->n_limits; j++)
 744                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 745                             c->limits[j].max > 1)
 746                                 return -EINVAL;
 747         }
 748
 749 #ifndef CONFIG_MAC80211_MESH
 750         /* mesh depends on Kconfig, but drivers should set it if they want */
 751         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 752 #endif
 753
 754         /* if the underlying driver supports mesh, mac80211 will (at least)
 755          * provide routing of mesh authentication frames to userspace */
 756         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 757                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 758
 759         /* mac80211 supports control port protocol changing */
 760         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 761
 762         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 763                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 764         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 765                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 766
 767         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 768              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 769              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 770
 771         /*
 772          * Calculate scan IE length -- we need this to alloc
 773          * memory and to subtract from the driver limit. It
 774          * includes the DS Params, (extended) supported rates, and HT
 775          * information -- SSID is the driver's responsibility.
 776          */
 777         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 778                 3 /* DS Params */;
 779         if (supp_ht)
 780                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 781
 782         if (!local->ops->hw_scan) {
 783                 /* For hw_scan, driver needs to set these up. */
 784                 local->hw.wiphy->max_scan_ssids = 4;
 785                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 786         }
 787
 788         /*
 789          * If the driver supports any scan IEs, then assume the
 790          * limit includes the IEs mac80211 will add, otherwise
 791          * leave it at zero and let the driver sort it out; we
 792          * still pass our IEs to the driver but userspace will
 793          * not be allowed to in that case.
 794          */
 795         if (local->hw.wiphy->max_scan_ie_len)
 796                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 797
 798         /* Set up cipher suites unless driver already did */
 799         if (!local->hw.wiphy->cipher_suites) {
 800                 local->hw.wiphy->cipher_suites = cipher_suites;
 801                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 802                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 803                         local->hw.wiphy->n_cipher_suites--;
 804         }
 805         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 806                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 807                         local->hw.wiphy->cipher_suites += 2;
 808                         local->hw.wiphy->n_cipher_suites -= 2;
 809                 } else {
 810                         u32 *suites;
 811                         int r, w = 0;
 812
 813                         /* Filter out WEP */
 814
 815                         suites = kmemdup(
 816                                 local->hw.wiphy->cipher_suites,
 817                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 818                                 GFP_KERNEL);
 819                         if (!suites)
 820                                 return -ENOMEM;
 821                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 822                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 823                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 824                                     suite == WLAN_CIPHER_SUITE_WEP104)
 825                                         continue;
 826                                 suites[w++] = suite;
 827                         }
 828                         local->hw.wiphy->cipher_suites = suites;
 829                         local->hw.wiphy->n_cipher_suites = w;
 830                         local->wiphy_ciphers_allocated = true;
 831                 }
 832         }
 833
 834         if (!local->ops->remain_on_channel)
 835                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 836
 837         if (local->ops->sched_scan_start)
 838                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 839
 840         /* mac80211 based drivers don't support internal TDLS setup */
 841         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 842                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 843
 844         result = wiphy_register(local->hw.wiphy);
 845         if (result < 0)
 846                 goto fail_wiphy_register;
 847
 848         /*
 849          * We use the number of queues for feature tests (QoS, HT) internally
 850          * so restrict them appropriately.
 851          */
 852         if (hw->queues > IEEE80211_MAX_QUEUES)
 853                 hw->queues = IEEE80211_MAX_QUEUES;
 854
 855         local->workqueue =
 856                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 857         if (!local->workqueue) {
 858                 result = -ENOMEM;
 859                 goto fail_workqueue;
 860         }
 861
 862         /*
 863          * The hardware needs headroom for sending the frame,
 864          * and we need some headroom for passing the frame to monitor
 865          * interfaces, but never both at the same time.
 866          */
 867         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 868                                    IEEE80211_TX_STATUS_HEADROOM);
 869
 870         debugfs_hw_add(local);
 871
 872         /*
 873          * if the driver doesn't specify a max listen interval we
 874          * use 5 which should be a safe default
 875          */
 876         if (local->hw.max_listen_interval == 0)
 877                 local->hw.max_listen_interval = 5;
 878
 879         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 880
 881         local->dynamic_ps_forced_timeout = -1;
 882
 883         result = ieee80211_wep_init(local);
 884         if (result < 0)
 885                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 886                             result);
 887
 888         ieee80211_led_init(local);
 889
 890         rtnl_lock();
 891
 892         result = ieee80211_init_rate_ctrl_alg(local,
 893                                               hw->rate_control_algorithm);
 894         if (result < 0) {
 895                 wiphy_debug(local->hw.wiphy,
 896                             "Failed to initialize rate control algorithm\n");
 897                 goto fail_rate;
 898         }
 899
 900         /* add one default STA interface if supported */
 901         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 902                 result = ieee80211_if_add(local, "wlan%d", NULL,
 903                                           NL80211_IFTYPE_STATION, NULL);
 904                 if (result)
 905                         wiphy_warn(local->hw.wiphy,
 906                                    "Failed to add default virtual iface\n");
 907         }
 908
 909         rtnl_unlock();
 910
 911         local->network_latency_notifier.notifier_call =
 912                 ieee80211_max_network_latency;
 913         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 914                                      &local->network_latency_notifier);
 915         if (result) {
 916                 rtnl_lock();
 917                 goto fail_pm_qos;
 918         }
 919
 920 #ifdef CONFIG_INET
 921         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 922         result = register_inetaddr_notifier(&local->ifa_notifier);
 923         if (result)
 924                 goto fail_ifa;
 925 #endif
 926
 927         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 928                         local->hw.napi_weight);
 929
 930         return 0;
 931
 932 #ifdef CONFIG_INET
 933  fail_ifa:
 934         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 935                                &local->network_latency_notifier);
 936         rtnl_lock();
 937 #endif
 938  fail_pm_qos:
 939         ieee80211_led_exit(local);
 940         ieee80211_remove_interfaces(local);
 941  fail_rate:
 942         rtnl_unlock();
 943         ieee80211_wep_free(local);
 944         sta_info_stop(local);
 945         destroy_workqueue(local->workqueue);
 946  fail_workqueue:
 947         wiphy_unregister(local->hw.wiphy);
 948  fail_wiphy_register:
 949         if (local->wiphy_ciphers_allocated)
 950                 kfree(local->hw.wiphy->cipher_suites);
 951         kfree(local->int_scan_req);
 952         return result;
 953 }
 954 EXPORT_SYMBOL(ieee80211_register_hw);
 955
 956 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 957 {
 958         struct ieee80211_local *local = hw_to_local(hw);
 959
 960         tasklet_kill(&local->tx_pending_tasklet);
 961         tasklet_kill(&local->tasklet);
 962
 963         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 964                                &local->network_latency_notifier);
 965 #ifdef CONFIG_INET
 966         unregister_inetaddr_notifier(&local->ifa_notifier);
 967 #endif
 968
 969         rtnl_lock();
 970
 971         /*
 972          * At this point, interface list manipulations are fine
 973          * because the driver cannot be handing us frames any
 974          * more and the tasklet is killed.
 975          */
 976         ieee80211_remove_interfaces(local);
 977
 978         rtnl_unlock();
 979
 980         /*
 981          * Now all work items will be gone, but the
 982          * timer might still be armed, so delete it
 983          */
 984         del_timer_sync(&local->work_timer);
 985
 986         cancel_work_sync(&local->restart_work);
 987         cancel_work_sync(&local->reconfig_filter);
 988
 989         ieee80211_clear_tx_pending(local);
 990         rate_control_deinitialize(local);
 991
 992         if (skb_queue_len(&local->skb_queue) ||
 993             skb_queue_len(&local->skb_queue_unreliable))
 994                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
 995         skb_queue_purge(&local->skb_queue);
 996         skb_queue_purge(&local->skb_queue_unreliable);
 997         skb_queue_purge(&local->rx_skb_queue);
 998
 999         destroy_workqueue(local->workqueue);
1000         wiphy_unregister(local->hw.wiphy);
1001         sta_info_stop(local);
1002         ieee80211_wep_free(local);
1003         ieee80211_led_exit(local);
1004         kfree(local->int_scan_req);
1005 }
1006 EXPORT_SYMBOL(ieee80211_unregister_hw);
1007
1008 void ieee80211_free_hw(struct ieee80211_hw *hw)
1009 {
1010         struct ieee80211_local *local = hw_to_local(hw);
1011
1012         mutex_destroy(&local->iflist_mtx);
1013         mutex_destroy(&local->mtx);
1014
1015         if (local->wiphy_ciphers_allocated)
1016                 kfree(local->hw.wiphy->cipher_suites);
1017
1018         wiphy_free(local->hw.wiphy);
1019 }
1020 EXPORT_SYMBOL(ieee80211_free_hw);
1021
1022 static int __init ieee80211_init(void)
1023 {
1024         struct sk_buff *skb;
1025         int ret;
1026
1027         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1028         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1029                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1030
1031         ret = rc80211_minstrel_init();
1032         if (ret)
1033                 return ret;
1034
1035         ret = rc80211_minstrel_ht_init();
1036         if (ret)
1037                 goto err_minstrel;
1038
1039         ret = rc80211_pid_init();
1040         if (ret)
1041                 goto err_pid;
1042
1043         ret = ieee80211_iface_init();
1044         if (ret)
1045                 goto err_netdev;
1046
1047         return 0;
1048  err_netdev:
1049         rc80211_pid_exit();
1050  err_pid:
1051         rc80211_minstrel_ht_exit();
1052  err_minstrel:
1053         rc80211_minstrel_exit();
1054
1055         return ret;
1056 }
1057
1058 static void __exit ieee80211_exit(void)
1059 {
1060         rc80211_pid_exit();
1061         rc80211_minstrel_ht_exit();
1062         rc80211_minstrel_exit();
1063
1064         if (mesh_allocated)
1065                 ieee80211s_stop();
1066
1067         ieee80211_iface_exit();
1068
1069         rcu_barrier();
1070 }
1071
1072
1073 subsys_initcall(ieee80211_init);
1074 module_exit(ieee80211_exit);
1075
1076 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1077 MODULE_LICENSE("GPL");