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 /*
  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 sta_info *sta, *tmp;
 329         struct skb_eosp_msg_data *eosp_data;
 330         struct sk_buff *skb;
 331
 332         while ((skb = skb_dequeue(&local->skb_queue)) ||
 333                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 334                 switch (skb->pkt_type) {
 335                 case IEEE80211_RX_MSG:
 336                         /* Clear skb->pkt_type in order to not confuse kernel
 337                          * netstack. */
 338                         skb->pkt_type = 0;
 339                         ieee80211_rx(local_to_hw(local), skb);
 340                         break;
 341                 case IEEE80211_TX_STATUS_MSG:
 342                         skb->pkt_type = 0;
 343                         ieee80211_tx_status(local_to_hw(local), skb);
 344                         break;
 345                 case IEEE80211_EOSP_MSG:
 346                         eosp_data = (void *)skb->cb;
 347                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 348                                 /* skip wrong virtual interface */
 349                                 if (memcmp(eosp_data->iface,
 350                                            sta->sdata->vif.addr, ETH_ALEN))
 351                                         continue;
 352                                 clear_sta_flag(sta, WLAN_STA_SP);
 353                                 break;
 354                         }
 355                         dev_kfree_skb(skb);
 356                         break;
 357                 default:
 358                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 359                              skb->pkt_type);
 360                         dev_kfree_skb(skb);
 361                         break;
 362                 }
 363         }
 364 }
 365
 366 static void ieee80211_restart_work(struct work_struct *work)
 367 {
 368         struct ieee80211_local *local =
 369                 container_of(work, struct ieee80211_local, restart_work);
 370
 371         /* wait for scan work complete */
 372         flush_workqueue(local->workqueue);
 373
 374         mutex_lock(&local->mtx);
 375         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 376              local->sched_scanning,
 377                 "%s called with hardware scan in progress\n", __func__);
 378         mutex_unlock(&local->mtx);
 379
 380         rtnl_lock();
 381         ieee80211_scan_cancel(local);
 382         ieee80211_reconfig(local);
 383         rtnl_unlock();
 384 }
 385
 386 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 387 {
 388         struct ieee80211_local *local = hw_to_local(hw);
 389
 390         trace_api_restart_hw(local);
 391
 392         wiphy_info(hw->wiphy,
 393                    "Hardware restart was requested\n");
 394
 395         /* use this reason, ieee80211_reconfig will unblock it */
 396         ieee80211_stop_queues_by_reason(hw,
 397                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 398
 399         schedule_work(&local->restart_work);
 400 }
 401 EXPORT_SYMBOL(ieee80211_restart_hw);
 402
 403 static void ieee80211_recalc_smps_work(struct work_struct *work)
 404 {
 405         struct ieee80211_local *local =
 406                 container_of(work, struct ieee80211_local, recalc_smps);
 407
 408         mutex_lock(&local->iflist_mtx);
 409         ieee80211_recalc_smps(local);
 410         mutex_unlock(&local->iflist_mtx);
 411 }
 412
 413 #ifdef CONFIG_INET
 414 static int ieee80211_ifa_changed(struct notifier_block *nb,
 415                                  unsigned long data, void *arg)
 416 {
 417         struct in_ifaddr *ifa = arg;
 418         struct ieee80211_local *local =
 419                 container_of(nb, struct ieee80211_local,
 420                              ifa_notifier);
 421         struct net_device *ndev = ifa->ifa_dev->dev;
 422         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 423         struct in_device *idev;
 424         struct ieee80211_sub_if_data *sdata;
 425         struct ieee80211_bss_conf *bss_conf;
 426         struct ieee80211_if_managed *ifmgd;
 427         int c = 0;
 428
 429         /* Make sure it's our interface that got changed */
 430         if (!wdev)
 431                 return NOTIFY_DONE;
 432
 433         if (wdev->wiphy != local->hw.wiphy)
 434                 return NOTIFY_DONE;
 435
 436         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 437         bss_conf = &sdata->vif.bss_conf;
 438
 439         if (!ieee80211_sdata_running(sdata))
 440                 return NOTIFY_DONE;
 441
 442         /* ARP filtering is only supported in managed mode */
 443         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 444                 return NOTIFY_DONE;
 445
 446         idev = __in_dev_get_rtnl(sdata->dev);
 447         if (!idev)
 448                 return NOTIFY_DONE;
 449
 450         ifmgd = &sdata->u.mgd;
 451         mutex_lock(&ifmgd->mtx);
 452
 453         /* Copy the addresses to the bss_conf list */
 454         ifa = idev->ifa_list;
 455         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 456                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 457                 ifa = ifa->ifa_next;
 458                 c++;
 459         }
 460
 461         /* If not all addresses fit the list, disable filtering */
 462         if (ifa) {
 463                 sdata->arp_filter_state = false;
 464                 c = 0;
 465         } else {
 466                 sdata->arp_filter_state = true;
 467         }
 468         bss_conf->arp_addr_cnt = c;
 469
 470         /* Configure driver only if associated */
 471         if (ifmgd->associated) {
 472                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 473                 ieee80211_bss_info_change_notify(sdata,
 474                                                  BSS_CHANGED_ARP_FILTER);
 475         }
 476
 477         mutex_unlock(&ifmgd->mtx);
 478
 479         return NOTIFY_DONE;
 480 }
 481 #endif
 482
 483 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 484 {
 485         struct ieee80211_local *local =
 486                 container_of(napi, struct ieee80211_local, napi);
 487
 488         return local->ops->napi_poll(&local->hw, budget);
 489 }
 490
 491 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 492 {
 493         struct ieee80211_local *local = hw_to_local(hw);
 494
 495         napi_schedule(&local->napi);
 496 }
 497 EXPORT_SYMBOL(ieee80211_napi_schedule);
 498
 499 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 500 {
 501         struct ieee80211_local *local = hw_to_local(hw);
 502
 503         napi_complete(&local->napi);
 504 }
 505 EXPORT_SYMBOL(ieee80211_napi_complete);
 506
 507 /* There isn't a lot of sense in it, but you can transmit anything you like */
 508 static const struct ieee80211_txrx_stypes
 509 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 510         [NL80211_IFTYPE_ADHOC] = {
 511                 .tx = 0xffff,
 512                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 513         },
 514         [NL80211_IFTYPE_STATION] = {
 515                 .tx = 0xffff,
 516                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 517                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 518         },
 519         [NL80211_IFTYPE_AP] = {
 520                 .tx = 0xffff,
 521                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 522                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 523                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 524                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 525                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 526                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 527                         BIT(IEEE80211_STYPE_ACTION >> 4),
 528         },
 529         [NL80211_IFTYPE_AP_VLAN] = {
 530                 /* copy AP */
 531                 .tx = 0xffff,
 532                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 533                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 534                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 535                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 536                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 537                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 538                         BIT(IEEE80211_STYPE_ACTION >> 4),
 539         },
 540         [NL80211_IFTYPE_P2P_CLIENT] = {
 541                 .tx = 0xffff,
 542                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 543                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 544         },
 545         [NL80211_IFTYPE_P2P_GO] = {
 546                 .tx = 0xffff,
 547                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 548                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 549                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 550                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 551                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 552                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 553                         BIT(IEEE80211_STYPE_ACTION >> 4),
 554         },
 555         [NL80211_IFTYPE_MESH_POINT] = {
 556                 .tx = 0xffff,
 557                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 558                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 559                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 560         },
 561 };
 562
 563 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 564                                         const struct ieee80211_ops *ops)
 565 {
 566         struct ieee80211_local *local;
 567         int priv_size, i;
 568         struct wiphy *wiphy;
 569
 570         /* Ensure 32-byte alignment of our private data and hw private data.
 571          * We use the wiphy priv data for both our ieee80211_local and for
 572          * the driver's private data
 573          *
 574          * In memory it'll be like this:
 575          *
 576          * +-------------------------+
 577          * | struct wiphy           |
 578          * +-------------------------+
 579          * | struct ieee80211_local  |
 580          * +-------------------------+
 581          * | driver's private data   |
 582          * +-------------------------+
 583          *
 584          */
 585         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 586
 587         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 588
 589         if (!wiphy)
 590                 return NULL;
 591
 592         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 593
 594         wiphy->privid = mac80211_wiphy_privid;
 595
 596         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 597                         WIPHY_FLAG_4ADDR_AP |
 598                         WIPHY_FLAG_4ADDR_STATION;
 599
 600         if (!ops->set_key)
 601                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 602
 603         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 604
 605         local = wiphy_priv(wiphy);
 606
 607         local->hw.wiphy = wiphy;
 608
 609         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 610
 611         BUG_ON(!ops->tx);
 612         BUG_ON(!ops->start);
 613         BUG_ON(!ops->stop);
 614         BUG_ON(!ops->config);
 615         BUG_ON(!ops->add_interface);
 616         BUG_ON(!ops->remove_interface);
 617         BUG_ON(!ops->configure_filter);
 618         local->ops = ops;
 619
 620         /* set up some defaults */
 621         local->hw.queues = 1;
 622         local->hw.max_rates = 1;
 623         local->hw.max_report_rates = 0;
 624         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 625         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 626         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 627         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 628         local->user_power_level = -1;
 629         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 630         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 631
 632         INIT_LIST_HEAD(&local->interfaces);
 633
 634         __hw_addr_init(&local->mc_list);
 635
 636         mutex_init(&local->iflist_mtx);
 637         mutex_init(&local->mtx);
 638
 639         mutex_init(&local->key_mtx);
 640         spin_lock_init(&local->filter_lock);
 641         spin_lock_init(&local->queue_stop_reason_lock);
 642
 643         /*
 644          * The rx_skb_queue is only accessed from tasklets,
 645          * but other SKB queues are used from within IRQ
 646          * context. Therefore, this one needs a different
 647          * locking class so our direct, non-irq-safe use of
 648          * the queue's lock doesn't throw lockdep warnings.
 649          */
 650         skb_queue_head_init_class(&local->rx_skb_queue,
 651                                   &ieee80211_rx_skb_queue_class);
 652
 653         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 654
 655         ieee80211_work_init(local);
 656
 657         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 658
 659         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 660         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 661         local->smps_mode = IEEE80211_SMPS_OFF;
 662
 663         INIT_WORK(&local->dynamic_ps_enable_work,
 664                   ieee80211_dynamic_ps_enable_work);
 665         INIT_WORK(&local->dynamic_ps_disable_work,
 666                   ieee80211_dynamic_ps_disable_work);
 667         setup_timer(&local->dynamic_ps_timer,
 668                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 669
 670         INIT_WORK(&local->sched_scan_stopped_work,
 671                   ieee80211_sched_scan_stopped_work);
 672
 673         sta_info_init(local);
 674
 675         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 676                 skb_queue_head_init(&local->pending[i]);
 677                 atomic_set(&local->agg_queue_stop[i], 0);
 678         }
 679         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 680                      (unsigned long)local);
 681
 682         tasklet_init(&local->tasklet,
 683                      ieee80211_tasklet_handler,
 684                      (unsigned long) local);
 685
 686         skb_queue_head_init(&local->skb_queue);
 687         skb_queue_head_init(&local->skb_queue_unreliable);
 688
 689         /* init dummy netdev for use w/ NAPI */
 690         init_dummy_netdev(&local->napi_dev);
 691
 692         ieee80211_led_names(local);
 693
 694         ieee80211_hw_roc_setup(local);
 695
 696         return local_to_hw(local);
 697 }
 698 EXPORT_SYMBOL(ieee80211_alloc_hw);
 699
 700 int ieee80211_register_hw(struct ieee80211_hw *hw)
 701 {
 702         struct ieee80211_local *local = hw_to_local(hw);
 703         int result, i;
 704         enum ieee80211_band band;
 705         int channels, max_bitrates;
 706         bool supp_ht;
 707         static const u32 cipher_suites[] = {
 708                 /* keep WEP first, it may be removed below */
 709                 WLAN_CIPHER_SUITE_WEP40,
 710                 WLAN_CIPHER_SUITE_WEP104,
 711                 WLAN_CIPHER_SUITE_TKIP,
 712                 WLAN_CIPHER_SUITE_CCMP,
 713
 714                 /* keep last -- depends on hw flags! */
 715                 WLAN_CIPHER_SUITE_AES_CMAC
 716         };
 717
 718         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 719 #ifdef CONFIG_PM
 720             && (!local->ops->suspend || !local->ops->resume)
 721 #endif
 722             )
 723                 return -EINVAL;
 724
 725         if (hw->max_report_rates == 0)
 726                 hw->max_report_rates = hw->max_rates;
 727
 728         /*
 729          * generic code guarantees at least one band,
 730          * set this very early because much code assumes
 731          * that hw.conf.channel is assigned
 732          */
 733         channels = 0;
 734         max_bitrates = 0;
 735         supp_ht = false;
 736         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 737                 struct ieee80211_supported_band *sband;
 738
 739                 sband = local->hw.wiphy->bands[band];
 740                 if (!sband)
 741                         continue;
 742                 if (!local->oper_channel) {
 743                         /* init channel we're on */
 744                         local->hw.conf.channel =
 745                         local->oper_channel = &sband->channels[0];
 746                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 747                 }
 748                 channels += sband->n_channels;
 749
 750                 if (max_bitrates < sband->n_bitrates)
 751                         max_bitrates = sband->n_bitrates;
 752                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 753         }
 754
 755         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 756                                       sizeof(void *) * channels, GFP_KERNEL);
 757         if (!local->int_scan_req)
 758                 return -ENOMEM;
 759
 760         /* if low-level driver supports AP, we also support VLAN */
 761         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 762                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 763                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 764         }
 765
 766         /* mac80211 always supports monitor */
 767         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 768         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 769
 770         /*
 771          * mac80211 doesn't support more than 1 channel, and also not more
 772          * than one IBSS interface
 773          */
 774         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 775                 const struct ieee80211_iface_combination *c;
 776                 int j;
 777
 778                 c = &hw->wiphy->iface_combinations[i];
 779
 780                 if (c->num_different_channels > 1)
 781                         return -EINVAL;
 782
 783                 for (j = 0; j < c->n_limits; j++)
 784                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 785                             c->limits[j].max > 1)
 786                                 return -EINVAL;
 787         }
 788
 789 #ifndef CONFIG_MAC80211_MESH
 790         /* mesh depends on Kconfig, but drivers should set it if they want */
 791         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 792 #endif
 793
 794         /* if the underlying driver supports mesh, mac80211 will (at least)
 795          * provide routing of mesh authentication frames to userspace */
 796         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 797                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 798
 799         /* mac80211 supports control port protocol changing */
 800         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 801
 802         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 803                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 804         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 805                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 806
 807         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 808              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 809              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 810
 811         /*
 812          * Calculate scan IE length -- we need this to alloc
 813          * memory and to subtract from the driver limit. It
 814          * includes the DS Params, (extended) supported rates, and HT
 815          * information -- SSID is the driver's responsibility.
 816          */
 817         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 818                 3 /* DS Params */;
 819         if (supp_ht)
 820                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 821
 822         if (!local->ops->hw_scan) {
 823                 /* For hw_scan, driver needs to set these up. */
 824                 local->hw.wiphy->max_scan_ssids = 4;
 825                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 826         }
 827
 828         /*
 829          * If the driver supports any scan IEs, then assume the
 830          * limit includes the IEs mac80211 will add, otherwise
 831          * leave it at zero and let the driver sort it out; we
 832          * still pass our IEs to the driver but userspace will
 833          * not be allowed to in that case.
 834          */
 835         if (local->hw.wiphy->max_scan_ie_len)
 836                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 837
 838         /* Set up cipher suites unless driver already did */
 839         if (!local->hw.wiphy->cipher_suites) {
 840                 local->hw.wiphy->cipher_suites = cipher_suites;
 841                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 842                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 843                         local->hw.wiphy->n_cipher_suites--;
 844         }
 845         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 846                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 847                         local->hw.wiphy->cipher_suites += 2;
 848                         local->hw.wiphy->n_cipher_suites -= 2;
 849                 } else {
 850                         u32 *suites;
 851                         int r, w = 0;
 852
 853                         /* Filter out WEP */
 854
 855                         suites = kmemdup(
 856                                 local->hw.wiphy->cipher_suites,
 857                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 858                                 GFP_KERNEL);
 859                         if (!suites)
 860                                 return -ENOMEM;
 861                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 862                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 863                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 864                                     suite == WLAN_CIPHER_SUITE_WEP104)
 865                                         continue;
 866                                 suites[w++] = suite;
 867                         }
 868                         local->hw.wiphy->cipher_suites = suites;
 869                         local->hw.wiphy->n_cipher_suites = w;
 870                         local->wiphy_ciphers_allocated = true;
 871                 }
 872         }
 873
 874         if (!local->ops->remain_on_channel)
 875                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 876
 877         if (local->ops->sched_scan_start)
 878                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 879
 880         /* mac80211 based drivers don't support internal TDLS setup */
 881         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 882                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 883
 884         result = wiphy_register(local->hw.wiphy);
 885         if (result < 0)
 886                 goto fail_wiphy_register;
 887
 888         /*
 889          * We use the number of queues for feature tests (QoS, HT) internally
 890          * so restrict them appropriately.
 891          */
 892         if (hw->queues > IEEE80211_MAX_QUEUES)
 893                 hw->queues = IEEE80211_MAX_QUEUES;
 894
 895         local->workqueue =
 896                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 897         if (!local->workqueue) {
 898                 result = -ENOMEM;
 899                 goto fail_workqueue;
 900         }
 901
 902         /*
 903          * The hardware needs headroom for sending the frame,
 904          * and we need some headroom for passing the frame to monitor
 905          * interfaces, but never both at the same time.
 906          */
 907         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 908                                    IEEE80211_TX_STATUS_HEADROOM);
 909
 910         debugfs_hw_add(local);
 911
 912         /*
 913          * if the driver doesn't specify a max listen interval we
 914          * use 5 which should be a safe default
 915          */
 916         if (local->hw.max_listen_interval == 0)
 917                 local->hw.max_listen_interval = 5;
 918
 919         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 920
 921         local->dynamic_ps_forced_timeout = -1;
 922
 923         result = ieee80211_wep_init(local);
 924         if (result < 0)
 925                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 926                             result);
 927
 928         rtnl_lock();
 929
 930         result = ieee80211_init_rate_ctrl_alg(local,
 931                                               hw->rate_control_algorithm);
 932         if (result < 0) {
 933                 wiphy_debug(local->hw.wiphy,
 934                             "Failed to initialize rate control algorithm\n");
 935                 goto fail_rate;
 936         }
 937
 938         /* add one default STA interface if supported */
 939         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 940                 result = ieee80211_if_add(local, "wlan%d", NULL,
 941                                           NL80211_IFTYPE_STATION, NULL);
 942                 if (result)
 943                         wiphy_warn(local->hw.wiphy,
 944                                    "Failed to add default virtual iface\n");
 945         }
 946
 947         rtnl_unlock();
 948
 949         ieee80211_led_init(local);
 950
 951         local->network_latency_notifier.notifier_call =
 952                 ieee80211_max_network_latency;
 953         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 954                                      &local->network_latency_notifier);
 955         if (result) {
 956                 rtnl_lock();
 957                 goto fail_pm_qos;
 958         }
 959
 960 #ifdef CONFIG_INET
 961         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 962         result = register_inetaddr_notifier(&local->ifa_notifier);
 963         if (result)
 964                 goto fail_ifa;
 965 #endif
 966
 967         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 968                         local->hw.napi_weight);
 969
 970         return 0;
 971
 972 #ifdef CONFIG_INET
 973  fail_ifa:
 974         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 975                                &local->network_latency_notifier);
 976         rtnl_lock();
 977 #endif
 978  fail_pm_qos:
 979         ieee80211_led_exit(local);
 980         ieee80211_remove_interfaces(local);
 981  fail_rate:
 982         rtnl_unlock();
 983         ieee80211_wep_free(local);
 984         sta_info_stop(local);
 985         destroy_workqueue(local->workqueue);
 986  fail_workqueue:
 987         wiphy_unregister(local->hw.wiphy);
 988  fail_wiphy_register:
 989         if (local->wiphy_ciphers_allocated)
 990                 kfree(local->hw.wiphy->cipher_suites);
 991         kfree(local->int_scan_req);
 992         return result;
 993 }
 994 EXPORT_SYMBOL(ieee80211_register_hw);
 995
 996 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 997 {
 998         struct ieee80211_local *local = hw_to_local(hw);
 999
1000         tasklet_kill(&local->tx_pending_tasklet);
1001         tasklet_kill(&local->tasklet);
1002
1003         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1004                                &local->network_latency_notifier);
1005 #ifdef CONFIG_INET
1006         unregister_inetaddr_notifier(&local->ifa_notifier);
1007 #endif
1008
1009         rtnl_lock();
1010
1011         /*
1012          * At this point, interface list manipulations are fine
1013          * because the driver cannot be handing us frames any
1014          * more and the tasklet is killed.
1015          */
1016         ieee80211_remove_interfaces(local);
1017
1018         rtnl_unlock();
1019
1020         /*
1021          * Now all work items will be gone, but the
1022          * timer might still be armed, so delete it
1023          */
1024         del_timer_sync(&local->work_timer);
1025
1026         cancel_work_sync(&local->restart_work);
1027         cancel_work_sync(&local->reconfig_filter);
1028
1029         ieee80211_clear_tx_pending(local);
1030         rate_control_deinitialize(local);
1031
1032         if (skb_queue_len(&local->skb_queue) ||
1033             skb_queue_len(&local->skb_queue_unreliable))
1034                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1035         skb_queue_purge(&local->skb_queue);
1036         skb_queue_purge(&local->skb_queue_unreliable);
1037         skb_queue_purge(&local->rx_skb_queue);
1038
1039         destroy_workqueue(local->workqueue);
1040         wiphy_unregister(local->hw.wiphy);
1041         sta_info_stop(local);
1042         ieee80211_wep_free(local);
1043         ieee80211_led_exit(local);
1044         kfree(local->int_scan_req);
1045 }
1046 EXPORT_SYMBOL(ieee80211_unregister_hw);
1047
1048 void ieee80211_free_hw(struct ieee80211_hw *hw)
1049 {
1050         struct ieee80211_local *local = hw_to_local(hw);
1051
1052         mutex_destroy(&local->iflist_mtx);
1053         mutex_destroy(&local->mtx);
1054
1055         if (local->wiphy_ciphers_allocated)
1056                 kfree(local->hw.wiphy->cipher_suites);
1057
1058         wiphy_free(local->hw.wiphy);
1059 }
1060 EXPORT_SYMBOL(ieee80211_free_hw);
1061
1062 static int __init ieee80211_init(void)
1063 {
1064         struct sk_buff *skb;
1065         int ret;
1066
1067         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1068         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1069                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1070
1071         ret = rc80211_minstrel_init();
1072         if (ret)
1073                 return ret;
1074
1075         ret = rc80211_minstrel_ht_init();
1076         if (ret)
1077                 goto err_minstrel;
1078
1079         ret = rc80211_pid_init();
1080         if (ret)
1081                 goto err_pid;
1082
1083         ret = ieee80211_iface_init();
1084         if (ret)
1085                 goto err_netdev;
1086
1087         return 0;
1088  err_netdev:
1089         rc80211_pid_exit();
1090  err_pid:
1091         rc80211_minstrel_ht_exit();
1092  err_minstrel:
1093         rc80211_minstrel_exit();
1094
1095         return ret;
1096 }
1097
1098 static void __exit ieee80211_exit(void)
1099 {
1100         rc80211_pid_exit();
1101         rc80211_minstrel_ht_exit();
1102         rc80211_minstrel_exit();
1103
1104         if (mesh_allocated)
1105                 ieee80211s_stop();
1106
1107         ieee80211_iface_exit();
1108
1109         rcu_barrier();
1110 }
1111
1112
1113 subsys_initcall(ieee80211_init);
1114 module_exit(ieee80211_exit);
1115
1116 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1117 MODULE_LICENSE("GPL");