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 static 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 static struct lock_class_key ieee80211_rx_skb_queue_class;
  43
  44 void ieee80211_configure_filter(struct ieee80211_local *local)
  45 {
  46         u64 mc;
  47         unsigned int changed_flags;
  48         unsigned int new_flags = 0;
  49
  50         if (atomic_read(&local->iff_promiscs))
  51                 new_flags |= FIF_PROMISC_IN_BSS;
  52
  53         if (atomic_read(&local->iff_allmultis))
  54                 new_flags |= FIF_ALLMULTI;
  55
  56         if (local->monitors || local->scanning)
  57                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  58
  59         if (local->fif_probe_req || local->probe_req_reg)
  60                 new_flags |= FIF_PROBE_REQ;
  61
  62         if (local->fif_fcsfail)
  63                 new_flags |= FIF_FCSFAIL;
  64
  65         if (local->fif_plcpfail)
  66                 new_flags |= FIF_PLCPFAIL;
  67
  68         if (local->fif_control)
  69                 new_flags |= FIF_CONTROL;
  70
  71         if (local->fif_other_bss)
  72                 new_flags |= FIF_OTHER_BSS;
  73
  74         if (local->fif_pspoll)
  75                 new_flags |= FIF_PSPOLL;
  76
  77         spin_lock_bh(&local->filter_lock);
  78         changed_flags = local->filter_flags ^ new_flags;
  79
  80         mc = drv_prepare_multicast(local, &local->mc_list);
  81         spin_unlock_bh(&local->filter_lock);
  82
  83         /* be a bit nasty */
  84         new_flags |= (1<<31);
  85
  86         drv_configure_filter(local, changed_flags, &new_flags, mc);
  87
  88         WARN_ON(new_flags & (1<<31));
  89
  90         local->filter_flags = new_flags & ~(1<<31);
  91 }
  92
  93 static void ieee80211_reconfig_filter(struct work_struct *work)
  94 {
  95         struct ieee80211_local *local =
  96                 container_of(work, struct ieee80211_local, reconfig_filter);
  97
  98         ieee80211_configure_filter(local);
  99 }
 100
 101 /*
 102  * Returns true if we are logically configured to be on
 103  * the operating channel AND the hardware-conf is currently
 104  * configured on the operating channel.  Compares channel-type
 105  * as well.
 106  */
 107 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
 108 {
 109         struct ieee80211_channel *chan, *scan_chan;
 110         enum nl80211_channel_type channel_type;
 111
 112         /* This logic needs to match logic in ieee80211_hw_config */
 113         if (local->scan_channel) {
 114                 chan = local->scan_channel;
 115                 /* If scanning on oper channel, use whatever channel-type
 116                  * is currently in use.
 117                  */
 118                 if (chan == local->oper_channel)
 119                         channel_type = local->_oper_channel_type;
 120                 else
 121                         channel_type = NL80211_CHAN_NO_HT;
 122         } else if (local->tmp_channel) {
 123                 chan = scan_chan = local->tmp_channel;
 124                 channel_type = local->tmp_channel_type;
 125         } else {
 126                 chan = local->oper_channel;
 127                 channel_type = local->_oper_channel_type;
 128         }
 129
 130         if (chan != local->oper_channel ||
 131             channel_type != local->_oper_channel_type)
 132                 return false;
 133
 134         /* Check current hardware-config against oper_channel. */
 135         if ((local->oper_channel != local->hw.conf.channel) ||
 136             (local->_oper_channel_type != local->hw.conf.channel_type))
 137                 return false;
 138
 139         return true;
 140 }
 141
 142 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 143 {
 144         struct ieee80211_channel *chan, *scan_chan;
 145         int ret = 0;
 146         int power;
 147         enum nl80211_channel_type channel_type;
 148         u32 offchannel_flag;
 149
 150         might_sleep();
 151
 152         scan_chan = local->scan_channel;
 153
 154         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
 155          * may need to change as well.
 156          */
 157         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 158         if (scan_chan) {
 159                 chan = scan_chan;
 160                 /* If scanning on oper channel, use whatever channel-type
 161                  * is currently in use.
 162                  */
 163                 if (chan == local->oper_channel)
 164                         channel_type = local->_oper_channel_type;
 165                 else
 166                         channel_type = NL80211_CHAN_NO_HT;
 167         } else if (local->tmp_channel) {
 168                 chan = scan_chan = local->tmp_channel;
 169                 channel_type = local->tmp_channel_type;
 170         } else {
 171                 chan = local->oper_channel;
 172                 channel_type = local->_oper_channel_type;
 173         }
 174
 175         if (chan != local->oper_channel ||
 176             channel_type != local->_oper_channel_type)
 177                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 178         else
 179                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 180
 181         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 182
 183         if (offchannel_flag || chan != local->hw.conf.channel ||
 184             channel_type != local->hw.conf.channel_type) {
 185                 local->hw.conf.channel = chan;
 186                 local->hw.conf.channel_type = channel_type;
 187                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 188         }
 189
 190         if (!conf_is_ht(&local->hw.conf)) {
 191                 /*
 192                  * mac80211.h documents that this is only valid
 193                  * when the channel is set to an HT type, and
 194                  * that otherwise STATIC is used.
 195                  */
 196                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 197         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 198                 local->hw.conf.smps_mode = local->smps_mode;
 199                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 200         }
 201
 202         if ((local->scanning & SCAN_SW_SCANNING) ||
 203             (local->scanning & SCAN_HW_SCANNING))
 204                 power = chan->max_power;
 205         else
 206                 power = local->power_constr_level ?
 207                         (chan->max_power - local->power_constr_level) :
 208                         chan->max_power;
 209
 210         if (local->user_power_level >= 0)
 211                 power = min(power, local->user_power_level);
 212
 213         if (local->hw.conf.power_level != power) {
 214                 changed |= IEEE80211_CONF_CHANGE_POWER;
 215                 local->hw.conf.power_level = power;
 216         }
 217
 218         if (changed && local->open_count) {
 219                 ret = drv_config(local, changed);
 220                 /*
 221                  * Goal:
 222                  * HW reconfiguration should never fail, the driver has told
 223                  * us what it can support so it should live up to that promise.
 224                  *
 225                  * Current status:
 226                  * rfkill is not integrated with mac80211 and a
 227                  * configuration command can thus fail if hardware rfkill
 228                  * is enabled
 229                  *
 230                  * FIXME: integrate rfkill with mac80211 and then add this
 231                  * WARN_ON() back
 232                  *
 233                  */
 234                 /* WARN_ON(ret); */
 235         }
 236
 237         return ret;
 238 }
 239
 240 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 241                                       u32 changed)
 242 {
 243         struct ieee80211_local *local = sdata->local;
 244         static const u8 zero[ETH_ALEN] = { 0 };
 245
 246         if (!changed)
 247                 return;
 248
 249         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 250                 /*
 251                  * While not associated, claim a BSSID of all-zeroes
 252                  * so that drivers don't do any weird things with the
 253                  * BSSID at that time.
 254                  */
 255                 if (sdata->vif.bss_conf.assoc)
 256                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 257                 else
 258                         sdata->vif.bss_conf.bssid = zero;
 259         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 260                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 261         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 262                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 263         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 264                 sdata->vif.bss_conf.bssid = NULL;
 265         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 266                 sdata->vif.bss_conf.bssid = zero;
 267         } else {
 268                 WARN_ON(1);
 269                 return;
 270         }
 271
 272         switch (sdata->vif.type) {
 273         case NL80211_IFTYPE_AP:
 274         case NL80211_IFTYPE_ADHOC:
 275         case NL80211_IFTYPE_WDS:
 276         case NL80211_IFTYPE_MESH_POINT:
 277                 break;
 278         default:
 279                 /* do not warn to simplify caller in scan.c */
 280                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 281                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 282                         return;
 283                 break;
 284         }
 285
 286         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 287                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 288                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 289                         sdata->vif.bss_conf.enable_beacon = false;
 290                 } else {
 291                         /*
 292                          * Beacon should be enabled, but AP mode must
 293                          * check whether there is a beacon configured.
 294                          */
 295                         switch (sdata->vif.type) {
 296                         case NL80211_IFTYPE_AP:
 297                                 sdata->vif.bss_conf.enable_beacon =
 298                                         !!sdata->u.ap.beacon;
 299                                 break;
 300                         case NL80211_IFTYPE_ADHOC:
 301                                 sdata->vif.bss_conf.enable_beacon =
 302                                         !!sdata->u.ibss.presp;
 303                                 break;
 304 #ifdef CONFIG_MAC80211_MESH
 305                         case NL80211_IFTYPE_MESH_POINT:
 306                                 sdata->vif.bss_conf.enable_beacon =
 307                                         !!sdata->u.mesh.mesh_id_len;
 308                                 break;
 309 #endif
 310                         default:
 311                                 /* not reached */
 312                                 WARN_ON(1);
 313                                 break;
 314                         }
 315                 }
 316         }
 317
 318         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 319 }
 320
 321 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 322 {
 323         sdata->vif.bss_conf.use_cts_prot = false;
 324         sdata->vif.bss_conf.use_short_preamble = false;
 325         sdata->vif.bss_conf.use_short_slot = false;
 326         return BSS_CHANGED_ERP_CTS_PROT |
 327                BSS_CHANGED_ERP_PREAMBLE |
 328                BSS_CHANGED_ERP_SLOT;
 329 }
 330
 331 static void ieee80211_tasklet_handler(unsigned long data)
 332 {
 333         struct ieee80211_local *local = (struct ieee80211_local *) data;
 334         struct sk_buff *skb;
 335
 336         while ((skb = skb_dequeue(&local->skb_queue)) ||
 337                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 338                 switch (skb->pkt_type) {
 339                 case IEEE80211_RX_MSG:
 340                         /* Clear skb->pkt_type in order to not confuse kernel
 341                          * netstack. */
 342                         skb->pkt_type = 0;
 343                         ieee80211_rx(local_to_hw(local), skb);
 344                         break;
 345                 case IEEE80211_TX_STATUS_MSG:
 346                         skb->pkt_type = 0;
 347                         ieee80211_tx_status(local_to_hw(local), skb);
 348                         break;
 349                 default:
 350                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 351                              skb->pkt_type);
 352                         dev_kfree_skb(skb);
 353                         break;
 354                 }
 355         }
 356 }
 357
 358 static void ieee80211_restart_work(struct work_struct *work)
 359 {
 360         struct ieee80211_local *local =
 361                 container_of(work, struct ieee80211_local, restart_work);
 362
 363         /* wait for scan work complete */
 364         flush_workqueue(local->workqueue);
 365
 366         mutex_lock(&local->mtx);
 367         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 368                 "%s called with hardware scan in progress\n", __func__);
 369         mutex_unlock(&local->mtx);
 370
 371         rtnl_lock();
 372         ieee80211_scan_cancel(local);
 373         ieee80211_reconfig(local);
 374         rtnl_unlock();
 375 }
 376
 377 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 378 {
 379         struct ieee80211_local *local = hw_to_local(hw);
 380
 381         trace_api_restart_hw(local);
 382
 383         wiphy_info(hw->wiphy,
 384                    "Hardware restart was requested\n");
 385
 386         /* use this reason, ieee80211_reconfig will unblock it */
 387         ieee80211_stop_queues_by_reason(hw,
 388                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 389
 390         schedule_work(&local->restart_work);
 391 }
 392 EXPORT_SYMBOL(ieee80211_restart_hw);
 393
 394 static void ieee80211_recalc_smps_work(struct work_struct *work)
 395 {
 396         struct ieee80211_local *local =
 397                 container_of(work, struct ieee80211_local, recalc_smps);
 398
 399         mutex_lock(&local->iflist_mtx);
 400         ieee80211_recalc_smps(local);
 401         mutex_unlock(&local->iflist_mtx);
 402 }
 403
 404 #ifdef CONFIG_INET
 405 static int ieee80211_ifa_changed(struct notifier_block *nb,
 406                                  unsigned long data, void *arg)
 407 {
 408         struct in_ifaddr *ifa = arg;
 409         struct ieee80211_local *local =
 410                 container_of(nb, struct ieee80211_local,
 411                              ifa_notifier);
 412         struct net_device *ndev = ifa->ifa_dev->dev;
 413         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 414         struct in_device *idev;
 415         struct ieee80211_sub_if_data *sdata;
 416         struct ieee80211_bss_conf *bss_conf;
 417         struct ieee80211_if_managed *ifmgd;
 418         int c = 0;
 419
 420         /* Make sure it's our interface that got changed */
 421         if (!wdev)
 422                 return NOTIFY_DONE;
 423
 424         if (wdev->wiphy != local->hw.wiphy)
 425                 return NOTIFY_DONE;
 426
 427         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 428         bss_conf = &sdata->vif.bss_conf;
 429
 430         if (!ieee80211_sdata_running(sdata))
 431                 return NOTIFY_DONE;
 432
 433         /* ARP filtering is only supported in managed mode */
 434         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 435                 return NOTIFY_DONE;
 436
 437         idev = __in_dev_get_rtnl(sdata->dev);
 438         if (!idev)
 439                 return NOTIFY_DONE;
 440
 441         ifmgd = &sdata->u.mgd;
 442         mutex_lock(&ifmgd->mtx);
 443
 444         /* Copy the addresses to the bss_conf list */
 445         ifa = idev->ifa_list;
 446         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 447                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 448                 ifa = ifa->ifa_next;
 449                 c++;
 450         }
 451
 452         /* If not all addresses fit the list, disable filtering */
 453         if (ifa) {
 454                 sdata->arp_filter_state = false;
 455                 c = 0;
 456         } else {
 457                 sdata->arp_filter_state = true;
 458         }
 459         bss_conf->arp_addr_cnt = c;
 460
 461         /* Configure driver only if associated */
 462         if (ifmgd->associated) {
 463                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 464                 ieee80211_bss_info_change_notify(sdata,
 465                                                  BSS_CHANGED_ARP_FILTER);
 466         }
 467
 468         mutex_unlock(&ifmgd->mtx);
 469
 470         return NOTIFY_DONE;
 471 }
 472 #endif
 473
 474 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 475 {
 476         struct ieee80211_local *local =
 477                 container_of(napi, struct ieee80211_local, napi);
 478
 479         return local->ops->napi_poll(&local->hw, budget);
 480 }
 481
 482 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 483 {
 484         struct ieee80211_local *local = hw_to_local(hw);
 485
 486         napi_schedule(&local->napi);
 487 }
 488 EXPORT_SYMBOL(ieee80211_napi_schedule);
 489
 490 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 491 {
 492         struct ieee80211_local *local = hw_to_local(hw);
 493
 494         napi_complete(&local->napi);
 495 }
 496 EXPORT_SYMBOL(ieee80211_napi_complete);
 497
 498 /* There isn't a lot of sense in it, but you can transmit anything you like */
 499 static const struct ieee80211_txrx_stypes
 500 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 501         [NL80211_IFTYPE_ADHOC] = {
 502                 .tx = 0xffff,
 503                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 504         },
 505         [NL80211_IFTYPE_STATION] = {
 506                 .tx = 0xffff,
 507                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 508                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 509         },
 510         [NL80211_IFTYPE_AP] = {
 511                 .tx = 0xffff,
 512                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 513                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 514                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 515                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 516                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 517                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 518                         BIT(IEEE80211_STYPE_ACTION >> 4),
 519         },
 520         [NL80211_IFTYPE_AP_VLAN] = {
 521                 /* copy AP */
 522                 .tx = 0xffff,
 523                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 524                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 525                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 526                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 527                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 528                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 529                         BIT(IEEE80211_STYPE_ACTION >> 4),
 530         },
 531         [NL80211_IFTYPE_P2P_CLIENT] = {
 532                 .tx = 0xffff,
 533                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 534                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 535         },
 536         [NL80211_IFTYPE_P2P_GO] = {
 537                 .tx = 0xffff,
 538                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 539                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 540                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 541                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 542                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 543                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 544                         BIT(IEEE80211_STYPE_ACTION >> 4),
 545         },
 546         [NL80211_IFTYPE_MESH_POINT] = {
 547                 .tx = 0xffff,
 548                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 549         },
 550 };
 551
 552 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 553                                         const struct ieee80211_ops *ops)
 554 {
 555         struct ieee80211_local *local;
 556         int priv_size, i;
 557         struct wiphy *wiphy;
 558
 559         /* Ensure 32-byte alignment of our private data and hw private data.
 560          * We use the wiphy priv data for both our ieee80211_local and for
 561          * the driver's private data
 562          *
 563          * In memory it'll be like this:
 564          *
 565          * +-------------------------+
 566          * | struct wiphy           |
 567          * +-------------------------+
 568          * | struct ieee80211_local  |
 569          * +-------------------------+
 570          * | driver's private data   |
 571          * +-------------------------+
 572          *
 573          */
 574         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 575
 576         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 577
 578         if (!wiphy)
 579                 return NULL;
 580
 581         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 582
 583         wiphy->privid = mac80211_wiphy_privid;
 584
 585         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 586                         WIPHY_FLAG_4ADDR_AP |
 587                         WIPHY_FLAG_4ADDR_STATION |
 588                         WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS;
 589
 590         if (!ops->set_key)
 591                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 592
 593         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 594
 595         local = wiphy_priv(wiphy);
 596
 597         local->hw.wiphy = wiphy;
 598
 599         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 600
 601         BUG_ON(!ops->tx);
 602         BUG_ON(!ops->start);
 603         BUG_ON(!ops->stop);
 604         BUG_ON(!ops->config);
 605         BUG_ON(!ops->add_interface);
 606         BUG_ON(!ops->remove_interface);
 607         BUG_ON(!ops->configure_filter);
 608         local->ops = ops;
 609
 610         /* set up some defaults */
 611         local->hw.queues = 1;
 612         local->hw.max_rates = 1;
 613         local->hw.max_report_rates = 0;
 614         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 615         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 616         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 617         local->user_power_level = -1;
 618         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 619         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 620
 621         INIT_LIST_HEAD(&local->interfaces);
 622
 623         __hw_addr_init(&local->mc_list);
 624
 625         mutex_init(&local->iflist_mtx);
 626         mutex_init(&local->mtx);
 627
 628         mutex_init(&local->key_mtx);
 629         spin_lock_init(&local->filter_lock);
 630         spin_lock_init(&local->queue_stop_reason_lock);
 631
 632         /*
 633          * The rx_skb_queue is only accessed from tasklets,
 634          * but other SKB queues are used from within IRQ
 635          * context. Therefore, this one needs a different
 636          * locking class so our direct, non-irq-safe use of
 637          * the queue's lock doesn't throw lockdep warnings.
 638          */
 639         skb_queue_head_init_class(&local->rx_skb_queue,
 640                                   &ieee80211_rx_skb_queue_class);
 641
 642         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 643
 644         ieee80211_work_init(local);
 645
 646         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 647
 648         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 649         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 650         local->smps_mode = IEEE80211_SMPS_OFF;
 651
 652         INIT_WORK(&local->dynamic_ps_enable_work,
 653                   ieee80211_dynamic_ps_enable_work);
 654         INIT_WORK(&local->dynamic_ps_disable_work,
 655                   ieee80211_dynamic_ps_disable_work);
 656         setup_timer(&local->dynamic_ps_timer,
 657                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 658
 659         sta_info_init(local);
 660
 661         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 662                 skb_queue_head_init(&local->pending[i]);
 663                 atomic_set(&local->agg_queue_stop[i], 0);
 664         }
 665         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 666                      (unsigned long)local);
 667
 668         tasklet_init(&local->tasklet,
 669                      ieee80211_tasklet_handler,
 670                      (unsigned long) local);
 671
 672         skb_queue_head_init(&local->skb_queue);
 673         skb_queue_head_init(&local->skb_queue_unreliable);
 674
 675         /* init dummy netdev for use w/ NAPI */
 676         init_dummy_netdev(&local->napi_dev);
 677
 678         ieee80211_led_names(local);
 679
 680         ieee80211_hw_roc_setup(local);
 681
 682         return local_to_hw(local);
 683 }
 684 EXPORT_SYMBOL(ieee80211_alloc_hw);
 685
 686 int ieee80211_register_hw(struct ieee80211_hw *hw)
 687 {
 688         struct ieee80211_local *local = hw_to_local(hw);
 689         int result;
 690         enum ieee80211_band band;
 691         int channels, max_bitrates;
 692         bool supp_ht;
 693         static const u32 cipher_suites[] = {
 694                 /* keep WEP first, it may be removed below */
 695                 WLAN_CIPHER_SUITE_WEP40,
 696                 WLAN_CIPHER_SUITE_WEP104,
 697                 WLAN_CIPHER_SUITE_TKIP,
 698                 WLAN_CIPHER_SUITE_CCMP,
 699
 700                 /* keep last -- depends on hw flags! */
 701                 WLAN_CIPHER_SUITE_AES_CMAC
 702         };
 703
 704         if (hw->max_report_rates == 0)
 705                 hw->max_report_rates = hw->max_rates;
 706
 707         /*
 708          * generic code guarantees at least one band,
 709          * set this very early because much code assumes
 710          * that hw.conf.channel is assigned
 711          */
 712         channels = 0;
 713         max_bitrates = 0;
 714         supp_ht = false;
 715         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 716                 struct ieee80211_supported_band *sband;
 717
 718                 sband = local->hw.wiphy->bands[band];
 719                 if (!sband)
 720                         continue;
 721                 if (!local->oper_channel) {
 722                         /* init channel we're on */
 723                         local->hw.conf.channel =
 724                         local->oper_channel = &sband->channels[0];
 725                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 726                 }
 727                 channels += sband->n_channels;
 728
 729                 /*
 730                  * Since ieee80211_disable_40mhz_24ghz is global, we can
 731                  * modify the sband's ht data even if the driver uses a
 732                  * global structure for that.
 733                  */
 734                 if (ieee80211_disable_40mhz_24ghz &&
 735                     band == IEEE80211_BAND_2GHZ &&
 736                     sband->ht_cap.ht_supported) {
 737                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 738                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 739                 }
 740
 741                 if (max_bitrates < sband->n_bitrates)
 742                         max_bitrates = sband->n_bitrates;
 743                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 744         }
 745
 746         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 747                                       sizeof(void *) * channels, GFP_KERNEL);
 748         if (!local->int_scan_req)
 749                 return -ENOMEM;
 750
 751         /* if low-level driver supports AP, we also support VLAN */
 752         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 753                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 754
 755         /* mac80211 always supports monitor */
 756         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 757
 758 #ifndef CONFIG_MAC80211_MESH
 759         /* mesh depends on Kconfig, but drivers should set it if they want */
 760         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 761 #endif
 762
 763         /* mac80211 supports control port protocol changing */
 764         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 765
 766         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 767                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 768         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 769                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 770
 771         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 772              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 773              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 774
 775         /*
 776          * Calculate scan IE length -- we need this to alloc
 777          * memory and to subtract from the driver limit. It
 778          * includes the DS Params, (extended) supported rates, and HT
 779          * information -- SSID is the driver's responsibility.
 780          */
 781         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 782                 3 /* DS Params */;
 783         if (supp_ht)
 784                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 785
 786         if (!local->ops->hw_scan) {
 787                 /* For hw_scan, driver needs to set these up. */
 788                 local->hw.wiphy->max_scan_ssids = 4;
 789                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 790         }
 791
 792         /*
 793          * If the driver supports any scan IEs, then assume the
 794          * limit includes the IEs mac80211 will add, otherwise
 795          * leave it at zero and let the driver sort it out; we
 796          * still pass our IEs to the driver but userspace will
 797          * not be allowed to in that case.
 798          */
 799         if (local->hw.wiphy->max_scan_ie_len)
 800                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 801
 802         /* Set up cipher suites unless driver already did */
 803         if (!local->hw.wiphy->cipher_suites) {
 804                 local->hw.wiphy->cipher_suites = cipher_suites;
 805                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 806                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 807                         local->hw.wiphy->n_cipher_suites--;
 808         }
 809         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 810                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 811                         local->hw.wiphy->cipher_suites += 2;
 812                         local->hw.wiphy->n_cipher_suites -= 2;
 813                 } else {
 814                         u32 *suites;
 815                         int r, w = 0;
 816
 817                         /* Filter out WEP */
 818
 819                         suites = kmemdup(
 820                                 local->hw.wiphy->cipher_suites,
 821                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 822                                 GFP_KERNEL);
 823                         if (!suites)
 824                                 return -ENOMEM;
 825                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 826                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 827                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 828                                     suite == WLAN_CIPHER_SUITE_WEP104)
 829                                         continue;
 830                                 suites[w++] = suite;
 831                         }
 832                         local->hw.wiphy->cipher_suites = suites;
 833                         local->hw.wiphy->n_cipher_suites = w;
 834                         local->wiphy_ciphers_allocated = true;
 835                 }
 836         }
 837
 838         if (!local->ops->remain_on_channel)
 839                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 840
 841         result = wiphy_register(local->hw.wiphy);
 842         if (result < 0)
 843                 goto fail_wiphy_register;
 844
 845         /*
 846          * We use the number of queues for feature tests (QoS, HT) internally
 847          * so restrict them appropriately.
 848          */
 849         if (hw->queues > IEEE80211_MAX_QUEUES)
 850                 hw->queues = IEEE80211_MAX_QUEUES;
 851
 852         local->workqueue =
 853                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 854         if (!local->workqueue) {
 855                 result = -ENOMEM;
 856                 goto fail_workqueue;
 857         }
 858
 859         /*
 860          * The hardware needs headroom for sending the frame,
 861          * and we need some headroom for passing the frame to monitor
 862          * interfaces, but never both at the same time.
 863          */
 864         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 865                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 866         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 867                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 868
 869         debugfs_hw_add(local);
 870
 871         /*
 872          * if the driver doesn't specify a max listen interval we
 873          * use 5 which should be a safe default
 874          */
 875         if (local->hw.max_listen_interval == 0)
 876                 local->hw.max_listen_interval = 5;
 877
 878         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 879
 880         local->dynamic_ps_forced_timeout = -1;
 881
 882         result = sta_info_start(local);
 883         if (result < 0)
 884                 goto fail_sta_info;
 885
 886         result = ieee80211_wep_init(local);
 887         if (result < 0)
 888                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 889                             result);
 890
 891         rtnl_lock();
 892
 893         result = ieee80211_init_rate_ctrl_alg(local,
 894                                               hw->rate_control_algorithm);
 895         if (result < 0) {
 896                 wiphy_debug(local->hw.wiphy,
 897                             "Failed to initialize rate control algorithm\n");
 898                 goto fail_rate;
 899         }
 900
 901         /* add one default STA interface if supported */
 902         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 903                 result = ieee80211_if_add(local, "wlan%d", NULL,
 904                                           NL80211_IFTYPE_STATION, NULL);
 905                 if (result)
 906                         wiphy_warn(local->hw.wiphy,
 907                                    "Failed to add default virtual iface\n");
 908         }
 909
 910         rtnl_unlock();
 911
 912         ieee80211_led_init(local);
 913
 914         local->network_latency_notifier.notifier_call =
 915                 ieee80211_max_network_latency;
 916         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 917                                      &local->network_latency_notifier);
 918         if (result) {
 919                 rtnl_lock();
 920                 goto fail_pm_qos;
 921         }
 922
 923 #ifdef CONFIG_INET
 924         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 925         result = register_inetaddr_notifier(&local->ifa_notifier);
 926         if (result)
 927                 goto fail_ifa;
 928 #endif
 929
 930         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 931                         local->hw.napi_weight);
 932
 933         return 0;
 934
 935 #ifdef CONFIG_INET
 936  fail_ifa:
 937         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 938                                &local->network_latency_notifier);
 939         rtnl_lock();
 940 #endif
 941  fail_pm_qos:
 942         ieee80211_led_exit(local);
 943         ieee80211_remove_interfaces(local);
 944  fail_rate:
 945         rtnl_unlock();
 946         ieee80211_wep_free(local);
 947         sta_info_stop(local);
 948  fail_sta_info:
 949         destroy_workqueue(local->workqueue);
 950  fail_workqueue:
 951         wiphy_unregister(local->hw.wiphy);
 952  fail_wiphy_register:
 953         if (local->wiphy_ciphers_allocated)
 954                 kfree(local->hw.wiphy->cipher_suites);
 955         kfree(local->int_scan_req);
 956         return result;
 957 }
 958 EXPORT_SYMBOL(ieee80211_register_hw);
 959
 960 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 961 {
 962         struct ieee80211_local *local = hw_to_local(hw);
 963
 964         tasklet_kill(&local->tx_pending_tasklet);
 965         tasklet_kill(&local->tasklet);
 966
 967         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 968                                &local->network_latency_notifier);
 969 #ifdef CONFIG_INET
 970         unregister_inetaddr_notifier(&local->ifa_notifier);
 971 #endif
 972
 973         rtnl_lock();
 974
 975         /*
 976          * At this point, interface list manipulations are fine
 977          * because the driver cannot be handing us frames any
 978          * more and the tasklet is killed.
 979          */
 980         ieee80211_remove_interfaces(local);
 981
 982         rtnl_unlock();
 983
 984         /*
 985          * Now all work items will be gone, but the
 986          * timer might still be armed, so delete it
 987          */
 988         del_timer_sync(&local->work_timer);
 989
 990         cancel_work_sync(&local->restart_work);
 991         cancel_work_sync(&local->reconfig_filter);
 992
 993         ieee80211_clear_tx_pending(local);
 994         sta_info_stop(local);
 995         rate_control_deinitialize(local);
 996
 997         if (skb_queue_len(&local->skb_queue) ||
 998             skb_queue_len(&local->skb_queue_unreliable))
 999                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1000         skb_queue_purge(&local->skb_queue);
1001         skb_queue_purge(&local->skb_queue_unreliable);
1002         skb_queue_purge(&local->rx_skb_queue);
1003
1004         destroy_workqueue(local->workqueue);
1005         wiphy_unregister(local->hw.wiphy);
1006         ieee80211_wep_free(local);
1007         ieee80211_led_exit(local);
1008         kfree(local->int_scan_req);
1009 }
1010 EXPORT_SYMBOL(ieee80211_unregister_hw);
1011
1012 void ieee80211_free_hw(struct ieee80211_hw *hw)
1013 {
1014         struct ieee80211_local *local = hw_to_local(hw);
1015
1016         mutex_destroy(&local->iflist_mtx);
1017         mutex_destroy(&local->mtx);
1018
1019         if (local->wiphy_ciphers_allocated)
1020                 kfree(local->hw.wiphy->cipher_suites);
1021
1022         wiphy_free(local->hw.wiphy);
1023 }
1024 EXPORT_SYMBOL(ieee80211_free_hw);
1025
1026 static int __init ieee80211_init(void)
1027 {
1028         struct sk_buff *skb;
1029         int ret;
1030
1031         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1032         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1033                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1034
1035         ret = rc80211_minstrel_init();
1036         if (ret)
1037                 return ret;
1038
1039         ret = rc80211_minstrel_ht_init();
1040         if (ret)
1041                 goto err_minstrel;
1042
1043         ret = rc80211_pid_init();
1044         if (ret)
1045                 goto err_pid;
1046
1047         ret = ieee80211_iface_init();
1048         if (ret)
1049                 goto err_netdev;
1050
1051         return 0;
1052  err_netdev:
1053         rc80211_pid_exit();
1054  err_pid:
1055         rc80211_minstrel_ht_exit();
1056  err_minstrel:
1057         rc80211_minstrel_exit();
1058
1059         return ret;
1060 }
1061
1062 static void __exit ieee80211_exit(void)
1063 {
1064         rc80211_pid_exit();
1065         rc80211_minstrel_ht_exit();
1066         rc80211_minstrel_exit();
1067
1068         if (mesh_allocated)
1069                 ieee80211s_stop();
1070
1071         ieee80211_iface_exit();
1072 }
1073
1074
1075 subsys_initcall(ieee80211_init);
1076 module_exit(ieee80211_exit);
1077
1078 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1079 MODULE_LICENSE("GPL");