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;
  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 ((local->scanning & SCAN_SW_SCANNING) ||
 154             (local->scanning & SCAN_HW_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         if (!ieee80211_sdata_running(sdata))
 397                 return NOTIFY_DONE;
 398
 399         /* ARP filtering is only supported in managed mode */
 400         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 401                 return NOTIFY_DONE;
 402
 403         idev = __in_dev_get_rtnl(sdata->dev);
 404         if (!idev)
 405                 return NOTIFY_DONE;
 406
 407         ifmgd = &sdata->u.mgd;
 408         mutex_lock(&ifmgd->mtx);
 409
 410         /* Copy the addresses to the bss_conf list */
 411         ifa = idev->ifa_list;
 412         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 413                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 414                 ifa = ifa->ifa_next;
 415                 c++;
 416         }
 417
 418         /* If not all addresses fit the list, disable filtering */
 419         if (ifa) {
 420                 sdata->arp_filter_state = false;
 421                 c = 0;
 422         } else {
 423                 sdata->arp_filter_state = true;
 424         }
 425         bss_conf->arp_addr_cnt = c;
 426
 427         /* Configure driver only if associated */
 428         if (ifmgd->associated) {
 429                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 430                 ieee80211_bss_info_change_notify(sdata,
 431                                                  BSS_CHANGED_ARP_FILTER);
 432         }
 433
 434         mutex_unlock(&ifmgd->mtx);
 435
 436         return NOTIFY_DONE;
 437 }
 438 #endif
 439
 440 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 441 {
 442         struct ieee80211_local *local =
 443                 container_of(napi, struct ieee80211_local, napi);
 444
 445         return local->ops->napi_poll(&local->hw, budget);
 446 }
 447
 448 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 449 {
 450         struct ieee80211_local *local = hw_to_local(hw);
 451
 452         napi_schedule(&local->napi);
 453 }
 454 EXPORT_SYMBOL(ieee80211_napi_schedule);
 455
 456 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 457 {
 458         struct ieee80211_local *local = hw_to_local(hw);
 459
 460         napi_complete(&local->napi);
 461 }
 462 EXPORT_SYMBOL(ieee80211_napi_complete);
 463
 464 /* There isn't a lot of sense in it, but you can transmit anything you like */
 465 static const struct ieee80211_txrx_stypes
 466 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 467         [NL80211_IFTYPE_ADHOC] = {
 468                 .tx = 0xffff,
 469                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 470         },
 471         [NL80211_IFTYPE_STATION] = {
 472                 .tx = 0xffff,
 473                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 474                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 475         },
 476         [NL80211_IFTYPE_AP] = {
 477                 .tx = 0xffff,
 478                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 479                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 480                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 481                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 482                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 483                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 484                         BIT(IEEE80211_STYPE_ACTION >> 4),
 485         },
 486         [NL80211_IFTYPE_AP_VLAN] = {
 487                 /* copy AP */
 488                 .tx = 0xffff,
 489                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 490                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 491                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 492                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 493                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 494                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 495                         BIT(IEEE80211_STYPE_ACTION >> 4),
 496         },
 497         [NL80211_IFTYPE_P2P_CLIENT] = {
 498                 .tx = 0xffff,
 499                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 500                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 501         },
 502         [NL80211_IFTYPE_P2P_GO] = {
 503                 .tx = 0xffff,
 504                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 505                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 506                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 507                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 508                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 509                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 510                         BIT(IEEE80211_STYPE_ACTION >> 4),
 511         },
 512         [NL80211_IFTYPE_MESH_POINT] = {
 513                 .tx = 0xffff,
 514                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 515                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 516                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 517         },
 518 };
 519
 520 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 521         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 522                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 523
 524         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 525                                 IEEE80211_HT_CAP_MAX_AMSDU |
 526                                 IEEE80211_HT_CAP_SGI_40),
 527         .mcs = {
 528                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 529                              0xff, 0xff, 0xff, 0xff, 0xff, },
 530         },
 531 };
 532
 533 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 534                                         const struct ieee80211_ops *ops)
 535 {
 536         struct ieee80211_local *local;
 537         int priv_size, i;
 538         struct wiphy *wiphy;
 539
 540         /* Ensure 32-byte alignment of our private data and hw private data.
 541          * We use the wiphy priv data for both our ieee80211_local and for
 542          * the driver's private data
 543          *
 544          * In memory it'll be like this:
 545          *
 546          * +-------------------------+
 547          * | struct wiphy           |
 548          * +-------------------------+
 549          * | struct ieee80211_local  |
 550          * +-------------------------+
 551          * | driver's private data   |
 552          * +-------------------------+
 553          *
 554          */
 555         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 556
 557         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 558
 559         if (!wiphy)
 560                 return NULL;
 561
 562         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 563
 564         wiphy->privid = mac80211_wiphy_privid;
 565
 566         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 567                         WIPHY_FLAG_4ADDR_AP |
 568                         WIPHY_FLAG_4ADDR_STATION |
 569                         WIPHY_FLAG_REPORTS_OBSS |
 570                         WIPHY_FLAG_OFFCHAN_TX |
 571                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 572
 573         wiphy->features = NL80211_FEATURE_SK_TX_STATUS;
 574
 575         if (!ops->set_key)
 576                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 577
 578         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 579
 580         local = wiphy_priv(wiphy);
 581
 582         local->hw.wiphy = wiphy;
 583
 584         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 585
 586         BUG_ON(!ops->tx && !ops->tx_frags);
 587         BUG_ON(!ops->start);
 588         BUG_ON(!ops->stop);
 589         BUG_ON(!ops->config);
 590         BUG_ON(!ops->add_interface);
 591         BUG_ON(!ops->remove_interface);
 592         BUG_ON(!ops->configure_filter);
 593         local->ops = ops;
 594
 595         /* set up some defaults */
 596         local->hw.queues = 1;
 597         local->hw.max_rates = 1;
 598         local->hw.max_report_rates = 0;
 599         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 600         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 601         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 602         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 603         local->user_power_level = -1;
 604         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 605         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 606         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 607
 608         INIT_LIST_HEAD(&local->interfaces);
 609
 610         __hw_addr_init(&local->mc_list);
 611
 612         mutex_init(&local->iflist_mtx);
 613         mutex_init(&local->mtx);
 614
 615         mutex_init(&local->key_mtx);
 616         spin_lock_init(&local->filter_lock);
 617         spin_lock_init(&local->queue_stop_reason_lock);
 618
 619         /*
 620          * The rx_skb_queue is only accessed from tasklets,
 621          * but other SKB queues are used from within IRQ
 622          * context. Therefore, this one needs a different
 623          * locking class so our direct, non-irq-safe use of
 624          * the queue's lock doesn't throw lockdep warnings.
 625          */
 626         skb_queue_head_init_class(&local->rx_skb_queue,
 627                                   &ieee80211_rx_skb_queue_class);
 628
 629         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 630
 631         ieee80211_work_init(local);
 632
 633         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 634
 635         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 636         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 637         local->smps_mode = IEEE80211_SMPS_OFF;
 638
 639         INIT_WORK(&local->dynamic_ps_enable_work,
 640                   ieee80211_dynamic_ps_enable_work);
 641         INIT_WORK(&local->dynamic_ps_disable_work,
 642                   ieee80211_dynamic_ps_disable_work);
 643         setup_timer(&local->dynamic_ps_timer,
 644                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 645
 646         INIT_WORK(&local->sched_scan_stopped_work,
 647                   ieee80211_sched_scan_stopped_work);
 648
 649         spin_lock_init(&local->ack_status_lock);
 650         idr_init(&local->ack_status_frames);
 651         /* preallocate at least one entry */
 652         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 653
 654         sta_info_init(local);
 655
 656         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 657                 skb_queue_head_init(&local->pending[i]);
 658                 atomic_set(&local->agg_queue_stop[i], 0);
 659         }
 660         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 661                      (unsigned long)local);
 662
 663         tasklet_init(&local->tasklet,
 664                      ieee80211_tasklet_handler,
 665                      (unsigned long) local);
 666
 667         skb_queue_head_init(&local->skb_queue);
 668         skb_queue_head_init(&local->skb_queue_unreliable);
 669
 670         /* init dummy netdev for use w/ NAPI */
 671         init_dummy_netdev(&local->napi_dev);
 672
 673         ieee80211_led_names(local);
 674
 675         ieee80211_hw_roc_setup(local);
 676
 677         return local_to_hw(local);
 678 }
 679 EXPORT_SYMBOL(ieee80211_alloc_hw);
 680
 681 int ieee80211_register_hw(struct ieee80211_hw *hw)
 682 {
 683         struct ieee80211_local *local = hw_to_local(hw);
 684         int result, i;
 685         enum ieee80211_band band;
 686         int channels, max_bitrates;
 687         bool supp_ht;
 688         static const u32 cipher_suites[] = {
 689                 /* keep WEP first, it may be removed below */
 690                 WLAN_CIPHER_SUITE_WEP40,
 691                 WLAN_CIPHER_SUITE_WEP104,
 692                 WLAN_CIPHER_SUITE_TKIP,
 693                 WLAN_CIPHER_SUITE_CCMP,
 694
 695                 /* keep last -- depends on hw flags! */
 696                 WLAN_CIPHER_SUITE_AES_CMAC
 697         };
 698
 699         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 700 #ifdef CONFIG_PM
 701             && (!local->ops->suspend || !local->ops->resume)
 702 #endif
 703             )
 704                 return -EINVAL;
 705
 706         if (hw->max_report_rates == 0)
 707                 hw->max_report_rates = hw->max_rates;
 708
 709         /*
 710          * generic code guarantees at least one band,
 711          * set this very early because much code assumes
 712          * that hw.conf.channel is assigned
 713          */
 714         channels = 0;
 715         max_bitrates = 0;
 716         supp_ht = false;
 717         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 718                 struct ieee80211_supported_band *sband;
 719
 720                 sband = local->hw.wiphy->bands[band];
 721                 if (!sband)
 722                         continue;
 723                 if (!local->oper_channel) {
 724                         /* init channel we're on */
 725                         local->hw.conf.channel =
 726                         local->oper_channel = &sband->channels[0];
 727                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 728                 }
 729                 channels += sband->n_channels;
 730
 731                 if (max_bitrates < sband->n_bitrates)
 732                         max_bitrates = sband->n_bitrates;
 733                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 734         }
 735
 736         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 737                                       sizeof(void *) * channels, GFP_KERNEL);
 738         if (!local->int_scan_req)
 739                 return -ENOMEM;
 740
 741         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 742                 if (!local->hw.wiphy->bands[band])
 743                         continue;
 744                 local->int_scan_req->rates[band] = (u32) -1;
 745         }
 746
 747         /* if low-level driver supports AP, we also support VLAN */
 748         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 749                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 750                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 751         }
 752
 753         /* mac80211 always supports monitor */
 754         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 755         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 756
 757         /*
 758          * mac80211 doesn't support more than 1 channel, and also not more
 759          * than one IBSS interface
 760          */
 761         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 762                 const struct ieee80211_iface_combination *c;
 763                 int j;
 764
 765                 c = &hw->wiphy->iface_combinations[i];
 766
 767                 if (c->num_different_channels > 1)
 768                         return -EINVAL;
 769
 770                 for (j = 0; j < c->n_limits; j++)
 771                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 772                             c->limits[j].max > 1)
 773                                 return -EINVAL;
 774         }
 775
 776 #ifndef CONFIG_MAC80211_MESH
 777         /* mesh depends on Kconfig, but drivers should set it if they want */
 778         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 779 #endif
 780
 781         /* if the underlying driver supports mesh, mac80211 will (at least)
 782          * provide routing of mesh authentication frames to userspace */
 783         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 784                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 785
 786         /* mac80211 supports control port protocol changing */
 787         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 788
 789         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 790                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 791         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 792                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 793
 794         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 795              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 796              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 797
 798         /*
 799          * Calculate scan IE length -- we need this to alloc
 800          * memory and to subtract from the driver limit. It
 801          * includes the DS Params, (extended) supported rates, and HT
 802          * information -- SSID is the driver's responsibility.
 803          */
 804         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 805                 3 /* DS Params */;
 806         if (supp_ht)
 807                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 808
 809         if (!local->ops->hw_scan) {
 810                 /* For hw_scan, driver needs to set these up. */
 811                 local->hw.wiphy->max_scan_ssids = 4;
 812                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 813         }
 814
 815         /*
 816          * If the driver supports any scan IEs, then assume the
 817          * limit includes the IEs mac80211 will add, otherwise
 818          * leave it at zero and let the driver sort it out; we
 819          * still pass our IEs to the driver but userspace will
 820          * not be allowed to in that case.
 821          */
 822         if (local->hw.wiphy->max_scan_ie_len)
 823                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 824
 825         /* Set up cipher suites unless driver already did */
 826         if (!local->hw.wiphy->cipher_suites) {
 827                 local->hw.wiphy->cipher_suites = cipher_suites;
 828                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 829                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 830                         local->hw.wiphy->n_cipher_suites--;
 831         }
 832         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 833                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 834                         local->hw.wiphy->cipher_suites += 2;
 835                         local->hw.wiphy->n_cipher_suites -= 2;
 836                 } else {
 837                         u32 *suites;
 838                         int r, w = 0;
 839
 840                         /* Filter out WEP */
 841
 842                         suites = kmemdup(
 843                                 local->hw.wiphy->cipher_suites,
 844                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 845                                 GFP_KERNEL);
 846                         if (!suites)
 847                                 return -ENOMEM;
 848                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 849                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 850                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 851                                     suite == WLAN_CIPHER_SUITE_WEP104)
 852                                         continue;
 853                                 suites[w++] = suite;
 854                         }
 855                         local->hw.wiphy->cipher_suites = suites;
 856                         local->hw.wiphy->n_cipher_suites = w;
 857                         local->wiphy_ciphers_allocated = true;
 858                 }
 859         }
 860
 861         if (!local->ops->remain_on_channel)
 862                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 863
 864         if (local->ops->sched_scan_start)
 865                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 866
 867         /* mac80211 based drivers don't support internal TDLS setup */
 868         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 869                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 870
 871         result = wiphy_register(local->hw.wiphy);
 872         if (result < 0)
 873                 goto fail_wiphy_register;
 874
 875         /*
 876          * We use the number of queues for feature tests (QoS, HT) internally
 877          * so restrict them appropriately.
 878          */
 879         if (hw->queues > IEEE80211_MAX_QUEUES)
 880                 hw->queues = IEEE80211_MAX_QUEUES;
 881
 882         local->workqueue =
 883                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 884         if (!local->workqueue) {
 885                 result = -ENOMEM;
 886                 goto fail_workqueue;
 887         }
 888
 889         /*
 890          * The hardware needs headroom for sending the frame,
 891          * and we need some headroom for passing the frame to monitor
 892          * interfaces, but never both at the same time.
 893          */
 894         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 895                                    IEEE80211_TX_STATUS_HEADROOM);
 896
 897         debugfs_hw_add(local);
 898
 899         /*
 900          * if the driver doesn't specify a max listen interval we
 901          * use 5 which should be a safe default
 902          */
 903         if (local->hw.max_listen_interval == 0)
 904                 local->hw.max_listen_interval = 5;
 905
 906         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 907
 908         local->dynamic_ps_forced_timeout = -1;
 909
 910         result = ieee80211_wep_init(local);
 911         if (result < 0)
 912                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 913                             result);
 914
 915         rtnl_lock();
 916
 917         result = ieee80211_init_rate_ctrl_alg(local,
 918                                               hw->rate_control_algorithm);
 919         if (result < 0) {
 920                 wiphy_debug(local->hw.wiphy,
 921                             "Failed to initialize rate control algorithm\n");
 922                 goto fail_rate;
 923         }
 924
 925         /* add one default STA interface if supported */
 926         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 927                 result = ieee80211_if_add(local, "wlan%d", NULL,
 928                                           NL80211_IFTYPE_STATION, NULL);
 929                 if (result)
 930                         wiphy_warn(local->hw.wiphy,
 931                                    "Failed to add default virtual iface\n");
 932         }
 933
 934         rtnl_unlock();
 935
 936         ieee80211_led_init(local);
 937
 938         local->network_latency_notifier.notifier_call =
 939                 ieee80211_max_network_latency;
 940         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 941                                      &local->network_latency_notifier);
 942         if (result) {
 943                 rtnl_lock();
 944                 goto fail_pm_qos;
 945         }
 946
 947 #ifdef CONFIG_INET
 948         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 949         result = register_inetaddr_notifier(&local->ifa_notifier);
 950         if (result)
 951                 goto fail_ifa;
 952 #endif
 953
 954         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 955                         local->hw.napi_weight);
 956
 957         return 0;
 958
 959 #ifdef CONFIG_INET
 960  fail_ifa:
 961         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 962                                &local->network_latency_notifier);
 963         rtnl_lock();
 964 #endif
 965  fail_pm_qos:
 966         ieee80211_led_exit(local);
 967         ieee80211_remove_interfaces(local);
 968  fail_rate:
 969         rtnl_unlock();
 970         ieee80211_wep_free(local);
 971         sta_info_stop(local);
 972         destroy_workqueue(local->workqueue);
 973  fail_workqueue:
 974         wiphy_unregister(local->hw.wiphy);
 975  fail_wiphy_register:
 976         if (local->wiphy_ciphers_allocated)
 977                 kfree(local->hw.wiphy->cipher_suites);
 978         kfree(local->int_scan_req);
 979         return result;
 980 }
 981 EXPORT_SYMBOL(ieee80211_register_hw);
 982
 983 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 984 {
 985         struct ieee80211_local *local = hw_to_local(hw);
 986
 987         tasklet_kill(&local->tx_pending_tasklet);
 988         tasklet_kill(&local->tasklet);
 989
 990         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 991                                &local->network_latency_notifier);
 992 #ifdef CONFIG_INET
 993         unregister_inetaddr_notifier(&local->ifa_notifier);
 994 #endif
 995
 996         rtnl_lock();
 997
 998         /*
 999          * At this point, interface list manipulations are fine
1000          * because the driver cannot be handing us frames any
1001          * more and the tasklet is killed.
1002          */
1003         ieee80211_remove_interfaces(local);
1004
1005         rtnl_unlock();
1006
1007         /*
1008          * Now all work items will be gone, but the
1009          * timer might still be armed, so delete it
1010          */
1011         del_timer_sync(&local->work_timer);
1012
1013         cancel_work_sync(&local->restart_work);
1014         cancel_work_sync(&local->reconfig_filter);
1015
1016         ieee80211_clear_tx_pending(local);
1017         rate_control_deinitialize(local);
1018
1019         if (skb_queue_len(&local->skb_queue) ||
1020             skb_queue_len(&local->skb_queue_unreliable))
1021                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1022         skb_queue_purge(&local->skb_queue);
1023         skb_queue_purge(&local->skb_queue_unreliable);
1024         skb_queue_purge(&local->rx_skb_queue);
1025
1026         destroy_workqueue(local->workqueue);
1027         wiphy_unregister(local->hw.wiphy);
1028         sta_info_stop(local);
1029         ieee80211_wep_free(local);
1030         ieee80211_led_exit(local);
1031         kfree(local->int_scan_req);
1032 }
1033 EXPORT_SYMBOL(ieee80211_unregister_hw);
1034
1035 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1036 {
1037         WARN_ONCE(1, "Have pending ack frames!\n");
1038         kfree_skb(p);
1039         return 0;
1040 }
1041
1042 void ieee80211_free_hw(struct ieee80211_hw *hw)
1043 {
1044         struct ieee80211_local *local = hw_to_local(hw);
1045
1046         mutex_destroy(&local->iflist_mtx);
1047         mutex_destroy(&local->mtx);
1048
1049         if (local->wiphy_ciphers_allocated)
1050                 kfree(local->hw.wiphy->cipher_suites);
1051
1052         idr_for_each(&local->ack_status_frames,
1053                      ieee80211_free_ack_frame, NULL);
1054         idr_destroy(&local->ack_status_frames);
1055
1056         wiphy_free(local->hw.wiphy);
1057 }
1058 EXPORT_SYMBOL(ieee80211_free_hw);
1059
1060 static int __init ieee80211_init(void)
1061 {
1062         struct sk_buff *skb;
1063         int ret;
1064
1065         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1066         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1067                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1068
1069         ret = rc80211_minstrel_init();
1070         if (ret)
1071                 return ret;
1072
1073         ret = rc80211_minstrel_ht_init();
1074         if (ret)
1075                 goto err_minstrel;
1076
1077         ret = rc80211_pid_init();
1078         if (ret)
1079                 goto err_pid;
1080
1081         ret = ieee80211_iface_init();
1082         if (ret)
1083                 goto err_netdev;
1084
1085         return 0;
1086  err_netdev:
1087         rc80211_pid_exit();
1088  err_pid:
1089         rc80211_minstrel_ht_exit();
1090  err_minstrel:
1091         rc80211_minstrel_exit();
1092
1093         return ret;
1094 }
1095
1096 static void __exit ieee80211_exit(void)
1097 {
1098         rc80211_pid_exit();
1099         rc80211_minstrel_ht_exit();
1100         rc80211_minstrel_exit();
1101
1102         if (mesh_allocated)
1103                 ieee80211s_stop();
1104
1105         ieee80211_iface_exit();
1106
1107         rcu_barrier();
1108 }
1109
1110
1111 subsys_initcall(ieee80211_init);
1112 module_exit(ieee80211_exit);
1113
1114 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1115 MODULE_LICENSE("GPL");