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 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 /*
  96  * Returns true if we are logically configured to be on
  97  * the operating channel AND the hardware-conf is currently
  98  * configured on the operating channel.  Compares channel-type
  99  * as well.
 100  */
 101 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
 102 {
 103         struct ieee80211_channel *chan, *scan_chan;
 104         enum nl80211_channel_type channel_type;
 105
 106         /* This logic needs to match logic in ieee80211_hw_config */
 107         if (local->scan_channel) {
 108                 chan = local->scan_channel;
 109                 /* If scanning on oper channel, use whatever channel-type
 110                  * is currently in use.
 111                  */
 112                 if (chan == local->oper_channel)
 113                         channel_type = local->_oper_channel_type;
 114                 else
 115                         channel_type = NL80211_CHAN_NO_HT;
 116         } else if (local->tmp_channel) {
 117                 chan = scan_chan = local->tmp_channel;
 118                 channel_type = local->tmp_channel_type;
 119         } else {
 120                 chan = local->oper_channel;
 121                 channel_type = local->_oper_channel_type;
 122         }
 123
 124         if (chan != local->oper_channel ||
 125             channel_type != local->_oper_channel_type)
 126                 return false;
 127
 128         /* Check current hardware-config against oper_channel. */
 129         if ((local->oper_channel != local->hw.conf.channel) ||
 130             (local->_oper_channel_type != local->hw.conf.channel_type))
 131                 return false;
 132
 133         return true;
 134 }
 135
 136 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 137 {
 138         struct ieee80211_channel *chan, *scan_chan;
 139         int ret = 0;
 140         int power;
 141         enum nl80211_channel_type channel_type;
 142         u32 offchannel_flag;
 143
 144         might_sleep();
 145
 146         scan_chan = local->scan_channel;
 147
 148         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
 149          * may need to change as well.
 150          */
 151         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 152         if (scan_chan) {
 153                 chan = scan_chan;
 154                 /* If scanning on oper channel, use whatever channel-type
 155                  * is currently in use.
 156                  */
 157                 if (chan == local->oper_channel)
 158                         channel_type = local->_oper_channel_type;
 159                 else
 160                         channel_type = NL80211_CHAN_NO_HT;
 161         } else if (local->tmp_channel) {
 162                 chan = scan_chan = local->tmp_channel;
 163                 channel_type = local->tmp_channel_type;
 164         } else {
 165                 chan = local->oper_channel;
 166                 channel_type = local->_oper_channel_type;
 167         }
 168
 169         if (chan != local->oper_channel ||
 170             channel_type != local->_oper_channel_type)
 171                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 172         else
 173                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 174
 175         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 176
 177         if (offchannel_flag || chan != local->hw.conf.channel ||
 178             channel_type != local->hw.conf.channel_type) {
 179                 local->hw.conf.channel = chan;
 180                 local->hw.conf.channel_type = channel_type;
 181                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 182         }
 183
 184         if (!conf_is_ht(&local->hw.conf)) {
 185                 /*
 186                  * mac80211.h documents that this is only valid
 187                  * when the channel is set to an HT type, and
 188                  * that otherwise STATIC is used.
 189                  */
 190                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 191         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 192                 local->hw.conf.smps_mode = local->smps_mode;
 193                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 194         }
 195
 196         if ((local->scanning & SCAN_SW_SCANNING) ||
 197             (local->scanning & SCAN_HW_SCANNING))
 198                 power = chan->max_power;
 199         else
 200                 power = local->power_constr_level ?
 201                         (chan->max_power - local->power_constr_level) :
 202                         chan->max_power;
 203
 204         if (local->user_power_level >= 0)
 205                 power = min(power, local->user_power_level);
 206
 207         if (local->hw.conf.power_level != power) {
 208                 changed |= IEEE80211_CONF_CHANGE_POWER;
 209                 local->hw.conf.power_level = power;
 210         }
 211
 212         if (changed && local->open_count) {
 213                 ret = drv_config(local, changed);
 214                 /*
 215                  * Goal:
 216                  * HW reconfiguration should never fail, the driver has told
 217                  * us what it can support so it should live up to that promise.
 218                  *
 219                  * Current status:
 220                  * rfkill is not integrated with mac80211 and a
 221                  * configuration command can thus fail if hardware rfkill
 222                  * is enabled
 223                  *
 224                  * FIXME: integrate rfkill with mac80211 and then add this
 225                  * WARN_ON() back
 226                  *
 227                  */
 228                 /* WARN_ON(ret); */
 229         }
 230
 231         return ret;
 232 }
 233
 234 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 235                                       u32 changed)
 236 {
 237         struct ieee80211_local *local = sdata->local;
 238         static const u8 zero[ETH_ALEN] = { 0 };
 239
 240         if (!changed)
 241                 return;
 242
 243         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 244                 /*
 245                  * While not associated, claim a BSSID of all-zeroes
 246                  * so that drivers don't do any weird things with the
 247                  * BSSID at that time.
 248                  */
 249                 if (sdata->vif.bss_conf.assoc)
 250                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 251                 else
 252                         sdata->vif.bss_conf.bssid = zero;
 253         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 254                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 255         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 256                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 257         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 258                 sdata->vif.bss_conf.bssid = NULL;
 259         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 260                 sdata->vif.bss_conf.bssid = zero;
 261         } else {
 262                 WARN_ON(1);
 263                 return;
 264         }
 265
 266         switch (sdata->vif.type) {
 267         case NL80211_IFTYPE_AP:
 268         case NL80211_IFTYPE_ADHOC:
 269         case NL80211_IFTYPE_WDS:
 270         case NL80211_IFTYPE_MESH_POINT:
 271                 break;
 272         default:
 273                 /* do not warn to simplify caller in scan.c */
 274                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 275                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 276                         return;
 277                 break;
 278         }
 279
 280         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 281                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 282                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 283                         sdata->vif.bss_conf.enable_beacon = false;
 284                 } else {
 285                         /*
 286                          * Beacon should be enabled, but AP mode must
 287                          * check whether there is a beacon configured.
 288                          */
 289                         switch (sdata->vif.type) {
 290                         case NL80211_IFTYPE_AP:
 291                                 sdata->vif.bss_conf.enable_beacon =
 292                                         !!sdata->u.ap.beacon;
 293                                 break;
 294                         case NL80211_IFTYPE_ADHOC:
 295                                 sdata->vif.bss_conf.enable_beacon =
 296                                         !!sdata->u.ibss.presp;
 297                                 break;
 298 #ifdef CONFIG_MAC80211_MESH
 299                         case NL80211_IFTYPE_MESH_POINT:
 300                                 sdata->vif.bss_conf.enable_beacon =
 301                                         !!sdata->u.mesh.mesh_id_len;
 302                                 break;
 303 #endif
 304                         default:
 305                                 /* not reached */
 306                                 WARN_ON(1);
 307                                 break;
 308                         }
 309                 }
 310         }
 311
 312         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 313 }
 314
 315 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 316 {
 317         sdata->vif.bss_conf.use_cts_prot = false;
 318         sdata->vif.bss_conf.use_short_preamble = false;
 319         sdata->vif.bss_conf.use_short_slot = false;
 320         return BSS_CHANGED_ERP_CTS_PROT |
 321                BSS_CHANGED_ERP_PREAMBLE |
 322                BSS_CHANGED_ERP_SLOT;
 323 }
 324
 325 static void ieee80211_tasklet_handler(unsigned long data)
 326 {
 327         struct ieee80211_local *local = (struct ieee80211_local *) data;
 328         struct sk_buff *skb;
 329
 330         while ((skb = skb_dequeue(&local->skb_queue)) ||
 331                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 332                 switch (skb->pkt_type) {
 333                 case IEEE80211_RX_MSG:
 334                         /* Clear skb->pkt_type in order to not confuse kernel
 335                          * netstack. */
 336                         skb->pkt_type = 0;
 337                         ieee80211_rx(local_to_hw(local), skb);
 338                         break;
 339                 case IEEE80211_TX_STATUS_MSG:
 340                         skb->pkt_type = 0;
 341                         ieee80211_tx_status(local_to_hw(local), skb);
 342                         break;
 343                 default:
 344                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 345                              skb->pkt_type);
 346                         dev_kfree_skb(skb);
 347                         break;
 348                 }
 349         }
 350 }
 351
 352 static void ieee80211_restart_work(struct work_struct *work)
 353 {
 354         struct ieee80211_local *local =
 355                 container_of(work, struct ieee80211_local, restart_work);
 356
 357         /* wait for scan work complete */
 358         flush_workqueue(local->workqueue);
 359
 360         mutex_lock(&local->mtx);
 361         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 362              local->sched_scanning,
 363                 "%s called with hardware scan in progress\n", __func__);
 364         mutex_unlock(&local->mtx);
 365
 366         rtnl_lock();
 367         ieee80211_scan_cancel(local);
 368         ieee80211_reconfig(local);
 369         rtnl_unlock();
 370 }
 371
 372 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 373 {
 374         struct ieee80211_local *local = hw_to_local(hw);
 375
 376         trace_api_restart_hw(local);
 377
 378         wiphy_info(hw->wiphy,
 379                    "Hardware restart was requested\n");
 380
 381         /* use this reason, ieee80211_reconfig will unblock it */
 382         ieee80211_stop_queues_by_reason(hw,
 383                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 384
 385         schedule_work(&local->restart_work);
 386 }
 387 EXPORT_SYMBOL(ieee80211_restart_hw);
 388
 389 static void ieee80211_recalc_smps_work(struct work_struct *work)
 390 {
 391         struct ieee80211_local *local =
 392                 container_of(work, struct ieee80211_local, recalc_smps);
 393
 394         mutex_lock(&local->iflist_mtx);
 395         ieee80211_recalc_smps(local);
 396         mutex_unlock(&local->iflist_mtx);
 397 }
 398
 399 #ifdef CONFIG_INET
 400 static int ieee80211_ifa_changed(struct notifier_block *nb,
 401                                  unsigned long data, void *arg)
 402 {
 403         struct in_ifaddr *ifa = arg;
 404         struct ieee80211_local *local =
 405                 container_of(nb, struct ieee80211_local,
 406                              ifa_notifier);
 407         struct net_device *ndev = ifa->ifa_dev->dev;
 408         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 409         struct in_device *idev;
 410         struct ieee80211_sub_if_data *sdata;
 411         struct ieee80211_bss_conf *bss_conf;
 412         struct ieee80211_if_managed *ifmgd;
 413         int c = 0;
 414
 415         /* Make sure it's our interface that got changed */
 416         if (!wdev)
 417                 return NOTIFY_DONE;
 418
 419         if (wdev->wiphy != local->hw.wiphy)
 420                 return NOTIFY_DONE;
 421
 422         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 423         bss_conf = &sdata->vif.bss_conf;
 424
 425         if (!ieee80211_sdata_running(sdata))
 426                 return NOTIFY_DONE;
 427
 428         /* ARP filtering is only supported in managed mode */
 429         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 430                 return NOTIFY_DONE;
 431
 432         idev = __in_dev_get_rtnl(sdata->dev);
 433         if (!idev)
 434                 return NOTIFY_DONE;
 435
 436         ifmgd = &sdata->u.mgd;
 437         mutex_lock(&ifmgd->mtx);
 438
 439         /* Copy the addresses to the bss_conf list */
 440         ifa = idev->ifa_list;
 441         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 442                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 443                 ifa = ifa->ifa_next;
 444                 c++;
 445         }
 446
 447         /* If not all addresses fit the list, disable filtering */
 448         if (ifa) {
 449                 sdata->arp_filter_state = false;
 450                 c = 0;
 451         } else {
 452                 sdata->arp_filter_state = true;
 453         }
 454         bss_conf->arp_addr_cnt = c;
 455
 456         /* Configure driver only if associated */
 457         if (ifmgd->associated) {
 458                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 459                 ieee80211_bss_info_change_notify(sdata,
 460                                                  BSS_CHANGED_ARP_FILTER);
 461         }
 462
 463         mutex_unlock(&ifmgd->mtx);
 464
 465         return NOTIFY_DONE;
 466 }
 467 #endif
 468
 469 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 470 {
 471         struct ieee80211_local *local =
 472                 container_of(napi, struct ieee80211_local, napi);
 473
 474         return local->ops->napi_poll(&local->hw, budget);
 475 }
 476
 477 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 478 {
 479         struct ieee80211_local *local = hw_to_local(hw);
 480
 481         napi_schedule(&local->napi);
 482 }
 483 EXPORT_SYMBOL(ieee80211_napi_schedule);
 484
 485 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 486 {
 487         struct ieee80211_local *local = hw_to_local(hw);
 488
 489         napi_complete(&local->napi);
 490 }
 491 EXPORT_SYMBOL(ieee80211_napi_complete);
 492
 493 /* There isn't a lot of sense in it, but you can transmit anything you like */
 494 static const struct ieee80211_txrx_stypes
 495 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 496         [NL80211_IFTYPE_ADHOC] = {
 497                 .tx = 0xffff,
 498                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 499         },
 500         [NL80211_IFTYPE_STATION] = {
 501                 .tx = 0xffff,
 502                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 504         },
 505         [NL80211_IFTYPE_AP] = {
 506                 .tx = 0xffff,
 507                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 508                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 509                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 510                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 511                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 512                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 513                         BIT(IEEE80211_STYPE_ACTION >> 4),
 514         },
 515         [NL80211_IFTYPE_AP_VLAN] = {
 516                 /* copy AP */
 517                 .tx = 0xffff,
 518                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 519                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 520                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 521                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 522                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 523                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 524                         BIT(IEEE80211_STYPE_ACTION >> 4),
 525         },
 526         [NL80211_IFTYPE_P2P_CLIENT] = {
 527                 .tx = 0xffff,
 528                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 529                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 530         },
 531         [NL80211_IFTYPE_P2P_GO] = {
 532                 .tx = 0xffff,
 533                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 534                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 535                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 536                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 537                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 538                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 539                         BIT(IEEE80211_STYPE_ACTION >> 4),
 540         },
 541         [NL80211_IFTYPE_MESH_POINT] = {
 542                 .tx = 0xffff,
 543                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 544                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 545                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 546         },
 547 };
 548
 549 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 550                                         const struct ieee80211_ops *ops)
 551 {
 552         struct ieee80211_local *local;
 553         int priv_size, i;
 554         struct wiphy *wiphy;
 555
 556         /* Ensure 32-byte alignment of our private data and hw private data.
 557          * We use the wiphy priv data for both our ieee80211_local and for
 558          * the driver's private data
 559          *
 560          * In memory it'll be like this:
 561          *
 562          * +-------------------------+
 563          * | struct wiphy           |
 564          * +-------------------------+
 565          * | struct ieee80211_local  |
 566          * +-------------------------+
 567          * | driver's private data   |
 568          * +-------------------------+
 569          *
 570          */
 571         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 572
 573         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 574
 575         if (!wiphy)
 576                 return NULL;
 577
 578         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 579
 580         wiphy->privid = mac80211_wiphy_privid;
 581
 582         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 583                         WIPHY_FLAG_4ADDR_AP |
 584                         WIPHY_FLAG_4ADDR_STATION;
 585
 586         if (!ops->set_key)
 587                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 588
 589         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 590
 591         local = wiphy_priv(wiphy);
 592
 593         local->hw.wiphy = wiphy;
 594
 595         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 596
 597         BUG_ON(!ops->tx);
 598         BUG_ON(!ops->start);
 599         BUG_ON(!ops->stop);
 600         BUG_ON(!ops->config);
 601         BUG_ON(!ops->add_interface);
 602         BUG_ON(!ops->remove_interface);
 603         BUG_ON(!ops->configure_filter);
 604         local->ops = ops;
 605
 606         /* set up some defaults */
 607         local->hw.queues = 1;
 608         local->hw.max_rates = 1;
 609         local->hw.max_report_rates = 0;
 610         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 611         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 612         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 613         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 614         local->user_power_level = -1;
 615         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 616         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 617
 618         INIT_LIST_HEAD(&local->interfaces);
 619
 620         __hw_addr_init(&local->mc_list);
 621
 622         mutex_init(&local->iflist_mtx);
 623         mutex_init(&local->mtx);
 624
 625         mutex_init(&local->key_mtx);
 626         spin_lock_init(&local->filter_lock);
 627         spin_lock_init(&local->queue_stop_reason_lock);
 628
 629         /*
 630          * The rx_skb_queue is only accessed from tasklets,
 631          * but other SKB queues are used from within IRQ
 632          * context. Therefore, this one needs a different
 633          * locking class so our direct, non-irq-safe use of
 634          * the queue's lock doesn't throw lockdep warnings.
 635          */
 636         skb_queue_head_init_class(&local->rx_skb_queue,
 637                                   &ieee80211_rx_skb_queue_class);
 638
 639         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 640
 641         ieee80211_work_init(local);
 642
 643         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 644
 645         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 646         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 647         local->smps_mode = IEEE80211_SMPS_OFF;
 648
 649         INIT_WORK(&local->dynamic_ps_enable_work,
 650                   ieee80211_dynamic_ps_enable_work);
 651         INIT_WORK(&local->dynamic_ps_disable_work,
 652                   ieee80211_dynamic_ps_disable_work);
 653         setup_timer(&local->dynamic_ps_timer,
 654                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 655
 656         INIT_WORK(&local->sched_scan_stopped_work,
 657                   ieee80211_sched_scan_stopped_work);
 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, i;
 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->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 705 #ifdef CONFIG_PM
 706             && (!local->ops->suspend || !local->ops->resume)
 707 #endif
 708             )
 709                 return -EINVAL;
 710
 711         if (hw->max_report_rates == 0)
 712                 hw->max_report_rates = hw->max_rates;
 713
 714         /*
 715          * generic code guarantees at least one band,
 716          * set this very early because much code assumes
 717          * that hw.conf.channel is assigned
 718          */
 719         channels = 0;
 720         max_bitrates = 0;
 721         supp_ht = false;
 722         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 723                 struct ieee80211_supported_band *sband;
 724
 725                 sband = local->hw.wiphy->bands[band];
 726                 if (!sband)
 727                         continue;
 728                 if (!local->oper_channel) {
 729                         /* init channel we're on */
 730                         local->hw.conf.channel =
 731                         local->oper_channel = &sband->channels[0];
 732                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 733                 }
 734                 channels += sband->n_channels;
 735
 736                 if (max_bitrates < sband->n_bitrates)
 737                         max_bitrates = sband->n_bitrates;
 738                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 739         }
 740
 741         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 742                                       sizeof(void *) * channels, GFP_KERNEL);
 743         if (!local->int_scan_req)
 744                 return -ENOMEM;
 745
 746         /* if low-level driver supports AP, we also support VLAN */
 747         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 748                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 749                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 750         }
 751
 752         /* mac80211 always supports monitor */
 753         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 754         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 755
 756         /*
 757          * mac80211 doesn't support more than 1 channel, and also not more
 758          * than one IBSS interface
 759          */
 760         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 761                 const struct ieee80211_iface_combination *c;
 762                 int j;
 763
 764                 c = &hw->wiphy->iface_combinations[i];
 765
 766                 if (c->num_different_channels > 1)
 767                         return -EINVAL;
 768
 769                 for (j = 0; j < c->n_limits; j++)
 770                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 771                             c->limits[j].max > 1)
 772                                 return -EINVAL;
 773         }
 774
 775 #ifndef CONFIG_MAC80211_MESH
 776         /* mesh depends on Kconfig, but drivers should set it if they want */
 777         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 778 #endif
 779
 780         /* if the underlying driver supports mesh, mac80211 will (at least)
 781          * provide routing of mesh authentication frames to userspace */
 782         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 783                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 784
 785         /* mac80211 supports control port protocol changing */
 786         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 787
 788         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 789                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 790         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 791                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 792
 793         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 794              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 795              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 796
 797         /*
 798          * Calculate scan IE length -- we need this to alloc
 799          * memory and to subtract from the driver limit. It
 800          * includes the DS Params, (extended) supported rates, and HT
 801          * information -- SSID is the driver's responsibility.
 802          */
 803         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 804                 3 /* DS Params */;
 805         if (supp_ht)
 806                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 807
 808         if (!local->ops->hw_scan) {
 809                 /* For hw_scan, driver needs to set these up. */
 810                 local->hw.wiphy->max_scan_ssids = 4;
 811                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 812         }
 813
 814         /*
 815          * If the driver supports any scan IEs, then assume the
 816          * limit includes the IEs mac80211 will add, otherwise
 817          * leave it at zero and let the driver sort it out; we
 818          * still pass our IEs to the driver but userspace will
 819          * not be allowed to in that case.
 820          */
 821         if (local->hw.wiphy->max_scan_ie_len)
 822                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 823
 824         /* Set up cipher suites unless driver already did */
 825         if (!local->hw.wiphy->cipher_suites) {
 826                 local->hw.wiphy->cipher_suites = cipher_suites;
 827                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 828                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 829                         local->hw.wiphy->n_cipher_suites--;
 830         }
 831         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 832                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 833                         local->hw.wiphy->cipher_suites += 2;
 834                         local->hw.wiphy->n_cipher_suites -= 2;
 835                 } else {
 836                         u32 *suites;
 837                         int r, w = 0;
 838
 839                         /* Filter out WEP */
 840
 841                         suites = kmemdup(
 842                                 local->hw.wiphy->cipher_suites,
 843                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 844                                 GFP_KERNEL);
 845                         if (!suites)
 846                                 return -ENOMEM;
 847                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 848                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 849                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 850                                     suite == WLAN_CIPHER_SUITE_WEP104)
 851                                         continue;
 852                                 suites[w++] = suite;
 853                         }
 854                         local->hw.wiphy->cipher_suites = suites;
 855                         local->hw.wiphy->n_cipher_suites = w;
 856                         local->wiphy_ciphers_allocated = true;
 857                 }
 858         }
 859
 860         if (!local->ops->remain_on_channel)
 861                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 862
 863         if (local->ops->sched_scan_start)
 864                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 865
 866         result = wiphy_register(local->hw.wiphy);
 867         if (result < 0)
 868                 goto fail_wiphy_register;
 869
 870         /*
 871          * We use the number of queues for feature tests (QoS, HT) internally
 872          * so restrict them appropriately.
 873          */
 874         if (hw->queues > IEEE80211_MAX_QUEUES)
 875                 hw->queues = IEEE80211_MAX_QUEUES;
 876
 877         local->workqueue =
 878                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 879         if (!local->workqueue) {
 880                 result = -ENOMEM;
 881                 goto fail_workqueue;
 882         }
 883
 884         /*
 885          * The hardware needs headroom for sending the frame,
 886          * and we need some headroom for passing the frame to monitor
 887          * interfaces, but never both at the same time.
 888          */
 889 #ifndef __CHECKER__
 890         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 891                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 892 #endif
 893         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 894                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 895
 896         debugfs_hw_add(local);
 897
 898         /*
 899          * if the driver doesn't specify a max listen interval we
 900          * use 5 which should be a safe default
 901          */
 902         if (local->hw.max_listen_interval == 0)
 903                 local->hw.max_listen_interval = 5;
 904
 905         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 906
 907         local->dynamic_ps_forced_timeout = -1;
 908
 909         result = ieee80211_wep_init(local);
 910         if (result < 0)
 911                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 912                             result);
 913
 914         rtnl_lock();
 915
 916         result = ieee80211_init_rate_ctrl_alg(local,
 917                                               hw->rate_control_algorithm);
 918         if (result < 0) {
 919                 wiphy_debug(local->hw.wiphy,
 920                             "Failed to initialize rate control algorithm\n");
 921                 goto fail_rate;
 922         }
 923
 924         /* add one default STA interface if supported */
 925         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 926                 result = ieee80211_if_add(local, "wlan%d", NULL,
 927                                           NL80211_IFTYPE_STATION, NULL);
 928                 if (result)
 929                         wiphy_warn(local->hw.wiphy,
 930                                    "Failed to add default virtual iface\n");
 931         }
 932
 933         rtnl_unlock();
 934
 935         ieee80211_led_init(local);
 936
 937         local->network_latency_notifier.notifier_call =
 938                 ieee80211_max_network_latency;
 939         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 940                                      &local->network_latency_notifier);
 941         if (result) {
 942                 rtnl_lock();
 943                 goto fail_pm_qos;
 944         }
 945
 946 #ifdef CONFIG_INET
 947         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 948         result = register_inetaddr_notifier(&local->ifa_notifier);
 949         if (result)
 950                 goto fail_ifa;
 951 #endif
 952
 953         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 954                         local->hw.napi_weight);
 955
 956         return 0;
 957
 958 #ifdef CONFIG_INET
 959  fail_ifa:
 960         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 961                                &local->network_latency_notifier);
 962         rtnl_lock();
 963 #endif
 964  fail_pm_qos:
 965         ieee80211_led_exit(local);
 966         ieee80211_remove_interfaces(local);
 967  fail_rate:
 968         rtnl_unlock();
 969         ieee80211_wep_free(local);
 970         sta_info_stop(local);
 971         destroy_workqueue(local->workqueue);
 972  fail_workqueue:
 973         wiphy_unregister(local->hw.wiphy);
 974  fail_wiphy_register:
 975         if (local->wiphy_ciphers_allocated)
 976                 kfree(local->hw.wiphy->cipher_suites);
 977         kfree(local->int_scan_req);
 978         return result;
 979 }
 980 EXPORT_SYMBOL(ieee80211_register_hw);
 981
 982 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 983 {
 984         struct ieee80211_local *local = hw_to_local(hw);
 985
 986         tasklet_kill(&local->tx_pending_tasklet);
 987         tasklet_kill(&local->tasklet);
 988
 989         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 990                                &local->network_latency_notifier);
 991 #ifdef CONFIG_INET
 992         unregister_inetaddr_notifier(&local->ifa_notifier);
 993 #endif
 994
 995         rtnl_lock();
 996
 997         /*
 998          * At this point, interface list manipulations are fine
 999          * because the driver cannot be handing us frames any
1000          * more and the tasklet is killed.
1001          */
1002         ieee80211_remove_interfaces(local);
1003
1004         rtnl_unlock();
1005
1006         /*
1007          * Now all work items will be gone, but the
1008          * timer might still be armed, so delete it
1009          */
1010         del_timer_sync(&local->work_timer);
1011
1012         cancel_work_sync(&local->restart_work);
1013         cancel_work_sync(&local->reconfig_filter);
1014
1015         ieee80211_clear_tx_pending(local);
1016         sta_info_stop(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         ieee80211_wep_free(local);
1029         ieee80211_led_exit(local);
1030         kfree(local->int_scan_req);
1031 }
1032 EXPORT_SYMBOL(ieee80211_unregister_hw);
1033
1034 void ieee80211_free_hw(struct ieee80211_hw *hw)
1035 {
1036         struct ieee80211_local *local = hw_to_local(hw);
1037
1038         mutex_destroy(&local->iflist_mtx);
1039         mutex_destroy(&local->mtx);
1040
1041         if (local->wiphy_ciphers_allocated)
1042                 kfree(local->hw.wiphy->cipher_suites);
1043
1044         wiphy_free(local->hw.wiphy);
1045 }
1046 EXPORT_SYMBOL(ieee80211_free_hw);
1047
1048 static int __init ieee80211_init(void)
1049 {
1050         struct sk_buff *skb;
1051         int ret;
1052
1053         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1054         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1055                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1056
1057         ret = rc80211_minstrel_init();
1058         if (ret)
1059                 return ret;
1060
1061         ret = rc80211_minstrel_ht_init();
1062         if (ret)
1063                 goto err_minstrel;
1064
1065         ret = rc80211_pid_init();
1066         if (ret)
1067                 goto err_pid;
1068
1069         ret = ieee80211_iface_init();
1070         if (ret)
1071                 goto err_netdev;
1072
1073         return 0;
1074  err_netdev:
1075         rc80211_pid_exit();
1076  err_pid:
1077         rc80211_minstrel_ht_exit();
1078  err_minstrel:
1079         rc80211_minstrel_exit();
1080
1081         return ret;
1082 }
1083
1084 static void __exit ieee80211_exit(void)
1085 {
1086         rc80211_pid_exit();
1087         rc80211_minstrel_ht_exit();
1088         rc80211_minstrel_exit();
1089
1090         if (mesh_allocated)
1091                 ieee80211s_stop();
1092
1093         ieee80211_iface_exit();
1094
1095         rcu_barrier();
1096 }
1097
1098
1099 subsys_initcall(ieee80211_init);
1100 module_exit(ieee80211_exit);
1101
1102 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1103 MODULE_LICENSE("GPL");