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 || test_bit(SCAN_SW_SCANNING, &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;
  98         int ret = 0;
  99         int power;
 100         enum nl80211_channel_type channel_type;
 101         u32 offchannel_flag;
 102
 103         might_sleep();
 104
 105         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
 106          * may need to change as well.
 107          */
 108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 109         if (local->scan_channel) {
 110                 chan = local->scan_channel;
 111                 /* If scanning on oper channel, use whatever channel-type
 112                  * is currently in use.
 113                  */
 114                 if (chan == local->oper_channel)
 115                         channel_type = local->_oper_channel_type;
 116                 else
 117                         channel_type = NL80211_CHAN_NO_HT;
 118         } else if (local->tmp_channel) {
 119                 chan = local->tmp_channel;
 120                 channel_type = local->tmp_channel_type;
 121         } else {
 122                 chan = local->oper_channel;
 123                 channel_type = local->_oper_channel_type;
 124         }
 125
 126         if (chan != local->oper_channel ||
 127             channel_type != local->_oper_channel_type)
 128                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 129         else
 130                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 131
 132         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 133
 134         if (offchannel_flag || chan != local->hw.conf.channel ||
 135             channel_type != local->hw.conf.channel_type) {
 136                 local->hw.conf.channel = chan;
 137                 local->hw.conf.channel_type = channel_type;
 138                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 139         }
 140
 141         if (!conf_is_ht(&local->hw.conf)) {
 142                 /*
 143                  * mac80211.h documents that this is only valid
 144                  * when the channel is set to an HT type, and
 145                  * that otherwise STATIC is used.
 146                  */
 147                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 148         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 149                 local->hw.conf.smps_mode = local->smps_mode;
 150                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 151         }
 152
 153         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 154             test_bit(SCAN_HW_SCANNING, &local->scanning))
 155                 power = chan->max_power;
 156         else
 157                 power = local->power_constr_level ?
 158                         (chan->max_power - local->power_constr_level) :
 159                         chan->max_power;
 160
 161         if (local->user_power_level >= 0)
 162                 power = min(power, local->user_power_level);
 163
 164         if (local->hw.conf.power_level != power) {
 165                 changed |= IEEE80211_CONF_CHANGE_POWER;
 166                 local->hw.conf.power_level = power;
 167         }
 168
 169         if (changed && local->open_count) {
 170                 ret = drv_config(local, changed);
 171                 /*
 172                  * Goal:
 173                  * HW reconfiguration should never fail, the driver has told
 174                  * us what it can support so it should live up to that promise.
 175                  *
 176                  * Current status:
 177                  * rfkill is not integrated with mac80211 and a
 178                  * configuration command can thus fail if hardware rfkill
 179                  * is enabled
 180                  *
 181                  * FIXME: integrate rfkill with mac80211 and then add this
 182                  * WARN_ON() back
 183                  *
 184                  */
 185                 /* WARN_ON(ret); */
 186         }
 187
 188         return ret;
 189 }
 190
 191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 192                                       u32 changed)
 193 {
 194         struct ieee80211_local *local = sdata->local;
 195         static const u8 zero[ETH_ALEN] = { 0 };
 196
 197         if (!changed)
 198                 return;
 199
 200         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 201                 /*
 202                  * While not associated, claim a BSSID of all-zeroes
 203                  * so that drivers don't do any weird things with the
 204                  * BSSID at that time.
 205                  */
 206                 if (sdata->vif.bss_conf.assoc)
 207                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 208                 else
 209                         sdata->vif.bss_conf.bssid = zero;
 210         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 211                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 212         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 213                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 214         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 215                 sdata->vif.bss_conf.bssid = NULL;
 216         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 217                 sdata->vif.bss_conf.bssid = zero;
 218         } else {
 219                 WARN_ON(1);
 220                 return;
 221         }
 222
 223         switch (sdata->vif.type) {
 224         case NL80211_IFTYPE_AP:
 225         case NL80211_IFTYPE_ADHOC:
 226         case NL80211_IFTYPE_WDS:
 227         case NL80211_IFTYPE_MESH_POINT:
 228                 break;
 229         default:
 230                 /* do not warn to simplify caller in scan.c */
 231                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 232                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 233                         return;
 234                 break;
 235         }
 236
 237         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 238                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 239                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 240                         sdata->vif.bss_conf.enable_beacon = false;
 241                 } else {
 242                         /*
 243                          * Beacon should be enabled, but AP mode must
 244                          * check whether there is a beacon configured.
 245                          */
 246                         switch (sdata->vif.type) {
 247                         case NL80211_IFTYPE_AP:
 248                                 sdata->vif.bss_conf.enable_beacon =
 249                                         !!sdata->u.ap.beacon;
 250                                 break;
 251                         case NL80211_IFTYPE_ADHOC:
 252                                 sdata->vif.bss_conf.enable_beacon =
 253                                         !!sdata->u.ibss.presp;
 254                                 break;
 255 #ifdef CONFIG_MAC80211_MESH
 256                         case NL80211_IFTYPE_MESH_POINT:
 257                                 sdata->vif.bss_conf.enable_beacon =
 258                                         !!sdata->u.mesh.mesh_id_len;
 259                                 break;
 260 #endif
 261                         default:
 262                                 /* not reached */
 263                                 WARN_ON(1);
 264                                 break;
 265                         }
 266                 }
 267         }
 268
 269         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 270 }
 271
 272 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 273 {
 274         sdata->vif.bss_conf.use_cts_prot = false;
 275         sdata->vif.bss_conf.use_short_preamble = false;
 276         sdata->vif.bss_conf.use_short_slot = false;
 277         return BSS_CHANGED_ERP_CTS_PROT |
 278                BSS_CHANGED_ERP_PREAMBLE |
 279                BSS_CHANGED_ERP_SLOT;
 280 }
 281
 282 static void ieee80211_tasklet_handler(unsigned long data)
 283 {
 284         struct ieee80211_local *local = (struct ieee80211_local *) data;
 285         struct sta_info *sta, *tmp;
 286         struct skb_eosp_msg_data *eosp_data;
 287         struct sk_buff *skb;
 288
 289         while ((skb = skb_dequeue(&local->skb_queue)) ||
 290                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 291                 switch (skb->pkt_type) {
 292                 case IEEE80211_RX_MSG:
 293                         /* Clear skb->pkt_type in order to not confuse kernel
 294                          * netstack. */
 295                         skb->pkt_type = 0;
 296                         ieee80211_rx(local_to_hw(local), skb);
 297                         break;
 298                 case IEEE80211_TX_STATUS_MSG:
 299                         skb->pkt_type = 0;
 300                         ieee80211_tx_status(local_to_hw(local), skb);
 301                         break;
 302                 case IEEE80211_EOSP_MSG:
 303                         eosp_data = (void *)skb->cb;
 304                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 305                                 /* skip wrong virtual interface */
 306                                 if (memcmp(eosp_data->iface,
 307                                            sta->sdata->vif.addr, ETH_ALEN))
 308                                         continue;
 309                                 clear_sta_flag(sta, WLAN_STA_SP);
 310                                 break;
 311                         }
 312                         dev_kfree_skb(skb);
 313                         break;
 314                 default:
 315                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 316                              skb->pkt_type);
 317                         dev_kfree_skb(skb);
 318                         break;
 319                 }
 320         }
 321 }
 322
 323 static void ieee80211_restart_work(struct work_struct *work)
 324 {
 325         struct ieee80211_local *local =
 326                 container_of(work, struct ieee80211_local, restart_work);
 327
 328         /* wait for scan work complete */
 329         flush_workqueue(local->workqueue);
 330
 331         mutex_lock(&local->mtx);
 332         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 333              local->sched_scanning,
 334                 "%s called with hardware scan in progress\n", __func__);
 335         mutex_unlock(&local->mtx);
 336
 337         rtnl_lock();
 338         ieee80211_scan_cancel(local);
 339         ieee80211_reconfig(local);
 340         rtnl_unlock();
 341 }
 342
 343 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 344 {
 345         struct ieee80211_local *local = hw_to_local(hw);
 346
 347         trace_api_restart_hw(local);
 348
 349         wiphy_info(hw->wiphy,
 350                    "Hardware restart was requested\n");
 351
 352         /* use this reason, ieee80211_reconfig will unblock it */
 353         ieee80211_stop_queues_by_reason(hw,
 354                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 355
 356         schedule_work(&local->restart_work);
 357 }
 358 EXPORT_SYMBOL(ieee80211_restart_hw);
 359
 360 static void ieee80211_recalc_smps_work(struct work_struct *work)
 361 {
 362         struct ieee80211_local *local =
 363                 container_of(work, struct ieee80211_local, recalc_smps);
 364
 365         mutex_lock(&local->iflist_mtx);
 366         ieee80211_recalc_smps(local);
 367         mutex_unlock(&local->iflist_mtx);
 368 }
 369
 370 #ifdef CONFIG_INET
 371 static int ieee80211_ifa_changed(struct notifier_block *nb,
 372                                  unsigned long data, void *arg)
 373 {
 374         struct in_ifaddr *ifa = arg;
 375         struct ieee80211_local *local =
 376                 container_of(nb, struct ieee80211_local,
 377                              ifa_notifier);
 378         struct net_device *ndev = ifa->ifa_dev->dev;
 379         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 380         struct in_device *idev;
 381         struct ieee80211_sub_if_data *sdata;
 382         struct ieee80211_bss_conf *bss_conf;
 383         struct ieee80211_if_managed *ifmgd;
 384         int c = 0;
 385
 386         /* Make sure it's our interface that got changed */
 387         if (!wdev)
 388                 return NOTIFY_DONE;
 389
 390         if (wdev->wiphy != local->hw.wiphy)
 391                 return NOTIFY_DONE;
 392
 393         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 394         bss_conf = &sdata->vif.bss_conf;
 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 (which also implies it is up) */
 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 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 518         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 519                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 520
 521         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 522                                 IEEE80211_HT_CAP_MAX_AMSDU |
 523                                 IEEE80211_HT_CAP_SGI_40),
 524         .mcs = {
 525                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 526                              0xff, 0xff, 0xff, 0xff, 0xff, },
 527         },
 528 };
 529
 530 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 531                                         const struct ieee80211_ops *ops)
 532 {
 533         struct ieee80211_local *local;
 534         int priv_size, i;
 535         struct wiphy *wiphy;
 536
 537         /* Ensure 32-byte alignment of our private data and hw private data.
 538          * We use the wiphy priv data for both our ieee80211_local and for
 539          * the driver's private data
 540          *
 541          * In memory it'll be like this:
 542          *
 543          * +-------------------------+
 544          * | struct wiphy           |
 545          * +-------------------------+
 546          * | struct ieee80211_local  |
 547          * +-------------------------+
 548          * | driver's private data   |
 549          * +-------------------------+
 550          *
 551          */
 552         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 553
 554         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 555
 556         if (!wiphy)
 557                 return NULL;
 558
 559         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 560
 561         wiphy->privid = mac80211_wiphy_privid;
 562
 563         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 564                         WIPHY_FLAG_4ADDR_AP |
 565                         WIPHY_FLAG_4ADDR_STATION |
 566                         WIPHY_FLAG_REPORTS_OBSS |
 567                         WIPHY_FLAG_OFFCHAN_TX |
 568                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 569
 570         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 571                           NL80211_FEATURE_HT_IBSS;
 572
 573         if (!ops->set_key)
 574                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 575
 576         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 577
 578         local = wiphy_priv(wiphy);
 579
 580         local->hw.wiphy = wiphy;
 581
 582         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 583
 584         BUG_ON(!ops->tx && !ops->tx_frags);
 585         BUG_ON(!ops->start);
 586         BUG_ON(!ops->stop);
 587         BUG_ON(!ops->config);
 588         BUG_ON(!ops->add_interface);
 589         BUG_ON(!ops->remove_interface);
 590         BUG_ON(!ops->configure_filter);
 591         local->ops = ops;
 592
 593         /* set up some defaults */
 594         local->hw.queues = 1;
 595         local->hw.max_rates = 1;
 596         local->hw.max_report_rates = 0;
 597         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 598         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 599         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 600         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 601         local->user_power_level = -1;
 602         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 603         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 604         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 605
 606         INIT_LIST_HEAD(&local->interfaces);
 607
 608         __hw_addr_init(&local->mc_list);
 609
 610         mutex_init(&local->iflist_mtx);
 611         mutex_init(&local->mtx);
 612
 613         mutex_init(&local->key_mtx);
 614         spin_lock_init(&local->filter_lock);
 615         spin_lock_init(&local->queue_stop_reason_lock);
 616
 617         /*
 618          * The rx_skb_queue is only accessed from tasklets,
 619          * but other SKB queues are used from within IRQ
 620          * context. Therefore, this one needs a different
 621          * locking class so our direct, non-irq-safe use of
 622          * the queue's lock doesn't throw lockdep warnings.
 623          */
 624         skb_queue_head_init_class(&local->rx_skb_queue,
 625                                   &ieee80211_rx_skb_queue_class);
 626
 627         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 628
 629         ieee80211_work_init(local);
 630
 631         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 632
 633         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 634         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 635         local->smps_mode = IEEE80211_SMPS_OFF;
 636
 637         INIT_WORK(&local->dynamic_ps_enable_work,
 638                   ieee80211_dynamic_ps_enable_work);
 639         INIT_WORK(&local->dynamic_ps_disable_work,
 640                   ieee80211_dynamic_ps_disable_work);
 641         setup_timer(&local->dynamic_ps_timer,
 642                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 643
 644         INIT_WORK(&local->sched_scan_stopped_work,
 645                   ieee80211_sched_scan_stopped_work);
 646
 647         spin_lock_init(&local->ack_status_lock);
 648         idr_init(&local->ack_status_frames);
 649         /* preallocate at least one entry */
 650         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 651
 652         sta_info_init(local);
 653
 654         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 655                 skb_queue_head_init(&local->pending[i]);
 656                 atomic_set(&local->agg_queue_stop[i], 0);
 657         }
 658         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 659                      (unsigned long)local);
 660
 661         tasklet_init(&local->tasklet,
 662                      ieee80211_tasklet_handler,
 663                      (unsigned long) local);
 664
 665         skb_queue_head_init(&local->skb_queue);
 666         skb_queue_head_init(&local->skb_queue_unreliable);
 667
 668         /* init dummy netdev for use w/ NAPI */
 669         init_dummy_netdev(&local->napi_dev);
 670
 671         ieee80211_led_names(local);
 672
 673         ieee80211_hw_roc_setup(local);
 674
 675         return local_to_hw(local);
 676 }
 677 EXPORT_SYMBOL(ieee80211_alloc_hw);
 678
 679 int ieee80211_register_hw(struct ieee80211_hw *hw)
 680 {
 681         struct ieee80211_local *local = hw_to_local(hw);
 682         int result, i;
 683         enum ieee80211_band band;
 684         int channels, max_bitrates;
 685         bool supp_ht;
 686         static const u32 cipher_suites[] = {
 687                 /* keep WEP first, it may be removed below */
 688                 WLAN_CIPHER_SUITE_WEP40,
 689                 WLAN_CIPHER_SUITE_WEP104,
 690                 WLAN_CIPHER_SUITE_TKIP,
 691                 WLAN_CIPHER_SUITE_CCMP,
 692
 693                 /* keep last -- depends on hw flags! */
 694                 WLAN_CIPHER_SUITE_AES_CMAC
 695         };
 696
 697         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 698 #ifdef CONFIG_PM
 699             && (!local->ops->suspend || !local->ops->resume)
 700 #endif
 701             )
 702                 return -EINVAL;
 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                 if (max_bitrates < sband->n_bitrates)
 730                         max_bitrates = sband->n_bitrates;
 731                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 732         }
 733
 734         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 735                                       sizeof(void *) * channels, GFP_KERNEL);
 736         if (!local->int_scan_req)
 737                 return -ENOMEM;
 738
 739         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 740                 if (!local->hw.wiphy->bands[band])
 741                         continue;
 742                 local->int_scan_req->rates[band] = (u32) -1;
 743         }
 744
 745         /* if low-level driver supports AP, we also support VLAN */
 746         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 747                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 748                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 749         }
 750
 751         /* mac80211 always supports monitor */
 752         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 753         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 754
 755         /*
 756          * mac80211 doesn't support more than 1 channel, and also not more
 757          * than one IBSS interface
 758          */
 759         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 760                 const struct ieee80211_iface_combination *c;
 761                 int j;
 762
 763                 c = &hw->wiphy->iface_combinations[i];
 764
 765                 if (c->num_different_channels > 1)
 766                         return -EINVAL;
 767
 768                 for (j = 0; j < c->n_limits; j++)
 769                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 770                             c->limits[j].max > 1)
 771                                 return -EINVAL;
 772         }
 773
 774 #ifndef CONFIG_MAC80211_MESH
 775         /* mesh depends on Kconfig, but drivers should set it if they want */
 776         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 777 #endif
 778
 779         /* if the underlying driver supports mesh, mac80211 will (at least)
 780          * provide routing of mesh authentication frames to userspace */
 781         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 782                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 783
 784         /* mac80211 supports control port protocol changing */
 785         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 786
 787         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 788                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 789         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 790                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 791
 792         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 793              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 794              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 795
 796         /*
 797          * Calculate scan IE length -- we need this to alloc
 798          * memory and to subtract from the driver limit. It
 799          * includes the DS Params, (extended) supported rates, and HT
 800          * information -- SSID is the driver's responsibility.
 801          */
 802         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 803                 3 /* DS Params */;
 804         if (supp_ht)
 805                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 806
 807         if (!local->ops->hw_scan) {
 808                 /* For hw_scan, driver needs to set these up. */
 809                 local->hw.wiphy->max_scan_ssids = 4;
 810                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 811         }
 812
 813         /*
 814          * If the driver supports any scan IEs, then assume the
 815          * limit includes the IEs mac80211 will add, otherwise
 816          * leave it at zero and let the driver sort it out; we
 817          * still pass our IEs to the driver but userspace will
 818          * not be allowed to in that case.
 819          */
 820         if (local->hw.wiphy->max_scan_ie_len)
 821                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 822
 823         /* Set up cipher suites unless driver already did */
 824         if (!local->hw.wiphy->cipher_suites) {
 825                 local->hw.wiphy->cipher_suites = cipher_suites;
 826                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 827                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 828                         local->hw.wiphy->n_cipher_suites--;
 829         }
 830         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 831                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 832                         local->hw.wiphy->cipher_suites += 2;
 833                         local->hw.wiphy->n_cipher_suites -= 2;
 834                 } else {
 835                         u32 *suites;
 836                         int r, w = 0;
 837
 838                         /* Filter out WEP */
 839
 840                         suites = kmemdup(
 841                                 local->hw.wiphy->cipher_suites,
 842                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 843                                 GFP_KERNEL);
 844                         if (!suites)
 845                                 return -ENOMEM;
 846                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 847                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 848                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 849                                     suite == WLAN_CIPHER_SUITE_WEP104)
 850                                         continue;
 851                                 suites[w++] = suite;
 852                         }
 853                         local->hw.wiphy->cipher_suites = suites;
 854                         local->hw.wiphy->n_cipher_suites = w;
 855                         local->wiphy_ciphers_allocated = true;
 856                 }
 857         }
 858
 859         if (!local->ops->remain_on_channel)
 860                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 861
 862         if (local->ops->sched_scan_start)
 863                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 864
 865         /* mac80211 based drivers don't support internal TDLS setup */
 866         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 867                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 868
 869         result = wiphy_register(local->hw.wiphy);
 870         if (result < 0)
 871                 goto fail_wiphy_register;
 872
 873         /*
 874          * We use the number of queues for feature tests (QoS, HT) internally
 875          * so restrict them appropriately.
 876          */
 877         if (hw->queues > IEEE80211_MAX_QUEUES)
 878                 hw->queues = IEEE80211_MAX_QUEUES;
 879
 880         local->workqueue =
 881                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 882         if (!local->workqueue) {
 883                 result = -ENOMEM;
 884                 goto fail_workqueue;
 885         }
 886
 887         /*
 888          * The hardware needs headroom for sending the frame,
 889          * and we need some headroom for passing the frame to monitor
 890          * interfaces, but never both at the same time.
 891          */
 892         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 893                                    IEEE80211_TX_STATUS_HEADROOM);
 894
 895         debugfs_hw_add(local);
 896
 897         /*
 898          * if the driver doesn't specify a max listen interval we
 899          * use 5 which should be a safe default
 900          */
 901         if (local->hw.max_listen_interval == 0)
 902                 local->hw.max_listen_interval = 5;
 903
 904         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 905
 906         local->dynamic_ps_forced_timeout = -1;
 907
 908         result = ieee80211_wep_init(local);
 909         if (result < 0)
 910                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 911                             result);
 912
 913         rtnl_lock();
 914
 915         result = ieee80211_init_rate_ctrl_alg(local,
 916                                               hw->rate_control_algorithm);
 917         if (result < 0) {
 918                 wiphy_debug(local->hw.wiphy,
 919                             "Failed to initialize rate control algorithm\n");
 920                 goto fail_rate;
 921         }
 922
 923         /* add one default STA interface if supported */
 924         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 925                 result = ieee80211_if_add(local, "wlan%d", NULL,
 926                                           NL80211_IFTYPE_STATION, NULL);
 927                 if (result)
 928                         wiphy_warn(local->hw.wiphy,
 929                                    "Failed to add default virtual iface\n");
 930         }
 931
 932         rtnl_unlock();
 933
 934         ieee80211_led_init(local);
 935
 936         local->network_latency_notifier.notifier_call =
 937                 ieee80211_max_network_latency;
 938         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 939                                      &local->network_latency_notifier);
 940         if (result) {
 941                 rtnl_lock();
 942                 goto fail_pm_qos;
 943         }
 944
 945 #ifdef CONFIG_INET
 946         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 947         result = register_inetaddr_notifier(&local->ifa_notifier);
 948         if (result)
 949                 goto fail_ifa;
 950 #endif
 951
 952         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 953                         local->hw.napi_weight);
 954
 955         return 0;
 956
 957 #ifdef CONFIG_INET
 958  fail_ifa:
 959         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 960                                &local->network_latency_notifier);
 961         rtnl_lock();
 962 #endif
 963  fail_pm_qos:
 964         ieee80211_led_exit(local);
 965         ieee80211_remove_interfaces(local);
 966  fail_rate:
 967         rtnl_unlock();
 968         ieee80211_wep_free(local);
 969         sta_info_stop(local);
 970         destroy_workqueue(local->workqueue);
 971  fail_workqueue:
 972         wiphy_unregister(local->hw.wiphy);
 973  fail_wiphy_register:
 974         if (local->wiphy_ciphers_allocated)
 975                 kfree(local->hw.wiphy->cipher_suites);
 976         kfree(local->int_scan_req);
 977         return result;
 978 }
 979 EXPORT_SYMBOL(ieee80211_register_hw);
 980
 981 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 982 {
 983         struct ieee80211_local *local = hw_to_local(hw);
 984
 985         tasklet_kill(&local->tx_pending_tasklet);
 986         tasklet_kill(&local->tasklet);
 987
 988         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 989                                &local->network_latency_notifier);
 990 #ifdef CONFIG_INET
 991         unregister_inetaddr_notifier(&local->ifa_notifier);
 992 #endif
 993
 994         rtnl_lock();
 995
 996         /*
 997          * At this point, interface list manipulations are fine
 998          * because the driver cannot be handing us frames any
 999          * more and the tasklet is killed.
1000          */
1001         ieee80211_remove_interfaces(local);
1002
1003         rtnl_unlock();
1004
1005         /*
1006          * Now all work items will be gone, but the
1007          * timer might still be armed, so delete it
1008          */
1009         del_timer_sync(&local->work_timer);
1010
1011         cancel_work_sync(&local->restart_work);
1012         cancel_work_sync(&local->reconfig_filter);
1013
1014         ieee80211_clear_tx_pending(local);
1015         rate_control_deinitialize(local);
1016
1017         if (skb_queue_len(&local->skb_queue) ||
1018             skb_queue_len(&local->skb_queue_unreliable))
1019                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1020         skb_queue_purge(&local->skb_queue);
1021         skb_queue_purge(&local->skb_queue_unreliable);
1022         skb_queue_purge(&local->rx_skb_queue);
1023
1024         destroy_workqueue(local->workqueue);
1025         wiphy_unregister(local->hw.wiphy);
1026         sta_info_stop(local);
1027         ieee80211_wep_free(local);
1028         ieee80211_led_exit(local);
1029         kfree(local->int_scan_req);
1030 }
1031 EXPORT_SYMBOL(ieee80211_unregister_hw);
1032
1033 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1034 {
1035         WARN_ONCE(1, "Have pending ack frames!\n");
1036         kfree_skb(p);
1037         return 0;
1038 }
1039
1040 void ieee80211_free_hw(struct ieee80211_hw *hw)
1041 {
1042         struct ieee80211_local *local = hw_to_local(hw);
1043
1044         mutex_destroy(&local->iflist_mtx);
1045         mutex_destroy(&local->mtx);
1046
1047         if (local->wiphy_ciphers_allocated)
1048                 kfree(local->hw.wiphy->cipher_suites);
1049
1050         idr_for_each(&local->ack_status_frames,
1051                      ieee80211_free_ack_frame, NULL);
1052         idr_destroy(&local->ack_status_frames);
1053
1054         wiphy_free(local->hw.wiphy);
1055 }
1056 EXPORT_SYMBOL(ieee80211_free_hw);
1057
1058 static int __init ieee80211_init(void)
1059 {
1060         struct sk_buff *skb;
1061         int ret;
1062
1063         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1064         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1065                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1066
1067         ret = rc80211_minstrel_init();
1068         if (ret)
1069                 return ret;
1070
1071         ret = rc80211_minstrel_ht_init();
1072         if (ret)
1073                 goto err_minstrel;
1074
1075         ret = rc80211_pid_init();
1076         if (ret)
1077                 goto err_pid;
1078
1079         ret = ieee80211_iface_init();
1080         if (ret)
1081                 goto err_netdev;
1082
1083         return 0;
1084  err_netdev:
1085         rc80211_pid_exit();
1086  err_pid:
1087         rc80211_minstrel_ht_exit();
1088  err_minstrel:
1089         rc80211_minstrel_exit();
1090
1091         return ret;
1092 }
1093
1094 static void __exit ieee80211_exit(void)
1095 {
1096         rc80211_pid_exit();
1097         rc80211_minstrel_ht_exit();
1098         rc80211_minstrel_exit();
1099
1100         if (mesh_allocated)
1101                 ieee80211s_stop();
1102
1103         ieee80211_iface_exit();
1104
1105         rcu_barrier();
1106 }
1107
1108
1109 subsys_initcall(ieee80211_init);
1110 module_exit(ieee80211_exit);
1111
1112 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1113 MODULE_LICENSE("GPL");