net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/pm_qos_params.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35
  36
  37 bool ieee80211_disable_40mhz_24ghz;
  38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
  39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
  40                  "Disable 40MHz support in the 2.4GHz band");
  41
  42 void ieee80211_configure_filter(struct ieee80211_local *local)
  43 {
  44         u64 mc;
  45         unsigned int changed_flags;
  46         unsigned int new_flags = 0;
  47
  48         if (atomic_read(&local->iff_promiscs))
  49                 new_flags |= FIF_PROMISC_IN_BSS;
  50
  51         if (atomic_read(&local->iff_allmultis))
  52                 new_flags |= FIF_ALLMULTI;
  53
  54         if (local->monitors || local->scanning)
  55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  56
  57         if (local->fif_probe_req || local->probe_req_reg)
  58                 new_flags |= FIF_PROBE_REQ;
  59
  60         if (local->fif_fcsfail)
  61                 new_flags |= FIF_FCSFAIL;
  62
  63         if (local->fif_plcpfail)
  64                 new_flags |= FIF_PLCPFAIL;
  65
  66         if (local->fif_control)
  67                 new_flags |= FIF_CONTROL;
  68
  69         if (local->fif_other_bss)
  70                 new_flags |= FIF_OTHER_BSS;
  71
  72         if (local->fif_pspoll)
  73                 new_flags |= FIF_PSPOLL;
  74
  75         spin_lock_bh(&local->filter_lock);
  76         changed_flags = local->filter_flags ^ new_flags;
  77
  78         mc = drv_prepare_multicast(local, &local->mc_list);
  79         spin_unlock_bh(&local->filter_lock);
  80
  81         /* be a bit nasty */
  82         new_flags |= (1<<31);
  83
  84         drv_configure_filter(local, changed_flags, &new_flags, mc);
  85
  86         WARN_ON(new_flags & (1<<31));
  87
  88         local->filter_flags = new_flags & ~(1<<31);
  89 }
  90
  91 static void ieee80211_reconfig_filter(struct work_struct *work)
  92 {
  93         struct ieee80211_local *local =
  94                 container_of(work, struct ieee80211_local, reconfig_filter);
  95
  96         ieee80211_configure_filter(local);
  97 }
  98
  99 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 100 {
 101         struct ieee80211_channel *chan, *scan_chan;
 102         int ret = 0;
 103         int power;
 104         enum nl80211_channel_type channel_type;
 105         u32 offchannel_flag;
 106
 107         might_sleep();
 108
 109         scan_chan = local->scan_channel;
 110
 111         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 112         if (scan_chan) {
 113                 chan = scan_chan;
 114                 channel_type = NL80211_CHAN_NO_HT;
 115                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 116         } else if (local->tmp_channel &&
 117                    local->oper_channel != local->tmp_channel) {
 118                 chan = scan_chan = local->tmp_channel;
 119                 channel_type = local->tmp_channel_type;
 120                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 121         } else {
 122                 chan = local->oper_channel;
 123                 channel_type = local->_oper_channel_type;
 124                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 125         }
 126         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 127
 128         if (offchannel_flag || chan != local->hw.conf.channel ||
 129             channel_type != local->hw.conf.channel_type) {
 130                 local->hw.conf.channel = chan;
 131                 local->hw.conf.channel_type = channel_type;
 132                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 133         }
 134
 135         if (!conf_is_ht(&local->hw.conf)) {
 136                 /*
 137                  * mac80211.h documents that this is only valid
 138                  * when the channel is set to an HT type, and
 139                  * that otherwise STATIC is used.
 140                  */
 141                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 142         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 143                 local->hw.conf.smps_mode = local->smps_mode;
 144                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 145         }
 146
 147         if (scan_chan)
 148                 power = chan->max_power;
 149         else
 150                 power = local->power_constr_level ?
 151                         (chan->max_power - local->power_constr_level) :
 152                         chan->max_power;
 153
 154         if (local->user_power_level >= 0)
 155                 power = min(power, local->user_power_level);
 156
 157         if (local->hw.conf.power_level != power) {
 158                 changed |= IEEE80211_CONF_CHANGE_POWER;
 159                 local->hw.conf.power_level = power;
 160         }
 161
 162         if (changed && local->open_count) {
 163                 ret = drv_config(local, changed);
 164                 /*
 165                  * Goal:
 166                  * HW reconfiguration should never fail, the driver has told
 167                  * us what it can support so it should live up to that promise.
 168                  *
 169                  * Current status:
 170                  * rfkill is not integrated with mac80211 and a
 171                  * configuration command can thus fail if hardware rfkill
 172                  * is enabled
 173                  *
 174                  * FIXME: integrate rfkill with mac80211 and then add this
 175                  * WARN_ON() back
 176                  *
 177                  */
 178                 /* WARN_ON(ret); */
 179         }
 180
 181         return ret;
 182 }
 183
 184 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 185                                       u32 changed)
 186 {
 187         struct ieee80211_local *local = sdata->local;
 188         static const u8 zero[ETH_ALEN] = { 0 };
 189
 190         if (!changed)
 191                 return;
 192
 193         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 194                 /*
 195                  * While not associated, claim a BSSID of all-zeroes
 196                  * so that drivers don't do any weird things with the
 197                  * BSSID at that time.
 198                  */
 199                 if (sdata->vif.bss_conf.assoc)
 200                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 201                 else
 202                         sdata->vif.bss_conf.bssid = zero;
 203         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 204                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 205         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 206                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 207         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 208                 sdata->vif.bss_conf.bssid = NULL;
 209         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 210                 sdata->vif.bss_conf.bssid = zero;
 211         } else {
 212                 WARN_ON(1);
 213                 return;
 214         }
 215
 216         switch (sdata->vif.type) {
 217         case NL80211_IFTYPE_AP:
 218         case NL80211_IFTYPE_ADHOC:
 219         case NL80211_IFTYPE_WDS:
 220         case NL80211_IFTYPE_MESH_POINT:
 221                 break;
 222         default:
 223                 /* do not warn to simplify caller in scan.c */
 224                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 225                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 226                         return;
 227                 break;
 228         }
 229
 230         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 231                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 232                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 233                         sdata->vif.bss_conf.enable_beacon = false;
 234                 } else {
 235                         /*
 236                          * Beacon should be enabled, but AP mode must
 237                          * check whether there is a beacon configured.
 238                          */
 239                         switch (sdata->vif.type) {
 240                         case NL80211_IFTYPE_AP:
 241                                 sdata->vif.bss_conf.enable_beacon =
 242                                         !!sdata->u.ap.beacon;
 243                                 break;
 244                         case NL80211_IFTYPE_ADHOC:
 245                                 sdata->vif.bss_conf.enable_beacon =
 246                                         !!sdata->u.ibss.presp;
 247                                 break;
 248                         case NL80211_IFTYPE_MESH_POINT:
 249                                 sdata->vif.bss_conf.enable_beacon =
 250                                         !!sdata->u.mesh.mesh_id_len;
 251                                 break;
 252                         default:
 253                                 /* not reached */
 254                                 WARN_ON(1);
 255                                 break;
 256                         }
 257                 }
 258         }
 259
 260         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 261 }
 262
 263 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 264 {
 265         sdata->vif.bss_conf.use_cts_prot = false;
 266         sdata->vif.bss_conf.use_short_preamble = false;
 267         sdata->vif.bss_conf.use_short_slot = false;
 268         return BSS_CHANGED_ERP_CTS_PROT |
 269                BSS_CHANGED_ERP_PREAMBLE |
 270                BSS_CHANGED_ERP_SLOT;
 271 }
 272
 273 static void ieee80211_tasklet_handler(unsigned long data)
 274 {
 275         struct ieee80211_local *local = (struct ieee80211_local *) data;
 276         struct sk_buff *skb;
 277
 278         while ((skb = skb_dequeue(&local->skb_queue)) ||
 279                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 280                 switch (skb->pkt_type) {
 281                 case IEEE80211_RX_MSG:
 282                         /* Clear skb->pkt_type in order to not confuse kernel
 283                          * netstack. */
 284                         skb->pkt_type = 0;
 285                         ieee80211_rx(local_to_hw(local), skb);
 286                         break;
 287                 case IEEE80211_TX_STATUS_MSG:
 288                         skb->pkt_type = 0;
 289                         ieee80211_tx_status(local_to_hw(local), skb);
 290                         break;
 291                 default:
 292                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 293                              skb->pkt_type);
 294                         dev_kfree_skb(skb);
 295                         break;
 296                 }
 297         }
 298 }
 299
 300 static void ieee80211_restart_work(struct work_struct *work)
 301 {
 302         struct ieee80211_local *local =
 303                 container_of(work, struct ieee80211_local, restart_work);
 304
 305         /* wait for scan work complete */
 306         flush_workqueue(local->workqueue);
 307
 308         mutex_lock(&local->mtx);
 309         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 310                 "%s called with hardware scan in progress\n", __func__);
 311         mutex_unlock(&local->mtx);
 312
 313         rtnl_lock();
 314         ieee80211_scan_cancel(local);
 315         ieee80211_reconfig(local);
 316         rtnl_unlock();
 317 }
 318
 319 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 320 {
 321         struct ieee80211_local *local = hw_to_local(hw);
 322
 323         trace_api_restart_hw(local);
 324
 325         /* use this reason, ieee80211_reconfig will unblock it */
 326         ieee80211_stop_queues_by_reason(hw,
 327                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 328
 329         schedule_work(&local->restart_work);
 330 }
 331 EXPORT_SYMBOL(ieee80211_restart_hw);
 332
 333 static void ieee80211_recalc_smps_work(struct work_struct *work)
 334 {
 335         struct ieee80211_local *local =
 336                 container_of(work, struct ieee80211_local, recalc_smps);
 337
 338         mutex_lock(&local->iflist_mtx);
 339         ieee80211_recalc_smps(local);
 340         mutex_unlock(&local->iflist_mtx);
 341 }
 342
 343 #ifdef CONFIG_INET
 344 static int ieee80211_ifa_changed(struct notifier_block *nb,
 345                                  unsigned long data, void *arg)
 346 {
 347         struct in_ifaddr *ifa = arg;
 348         struct ieee80211_local *local =
 349                 container_of(nb, struct ieee80211_local,
 350                              ifa_notifier);
 351         struct net_device *ndev = ifa->ifa_dev->dev;
 352         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 353         struct in_device *idev;
 354         struct ieee80211_sub_if_data *sdata;
 355         struct ieee80211_bss_conf *bss_conf;
 356         struct ieee80211_if_managed *ifmgd;
 357         int c = 0;
 358
 359         /* Make sure it's our interface that got changed */
 360         if (!wdev)
 361                 return NOTIFY_DONE;
 362
 363         if (wdev->wiphy != local->hw.wiphy)
 364                 return NOTIFY_DONE;
 365
 366         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 367         bss_conf = &sdata->vif.bss_conf;
 368
 369         if (!ieee80211_sdata_running(sdata))
 370                 return NOTIFY_DONE;
 371
 372         /* ARP filtering is only supported in managed mode */
 373         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 374                 return NOTIFY_DONE;
 375
 376         idev = __in_dev_get_rtnl(sdata->dev);
 377         if (!idev)
 378                 return NOTIFY_DONE;
 379
 380         ifmgd = &sdata->u.mgd;
 381         mutex_lock(&ifmgd->mtx);
 382
 383         /* Copy the addresses to the bss_conf list */
 384         ifa = idev->ifa_list;
 385         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 386                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 387                 ifa = ifa->ifa_next;
 388                 c++;
 389         }
 390
 391         /* If not all addresses fit the list, disable filtering */
 392         if (ifa) {
 393                 sdata->arp_filter_state = false;
 394                 c = 0;
 395         } else {
 396                 sdata->arp_filter_state = true;
 397         }
 398         bss_conf->arp_addr_cnt = c;
 399
 400         /* Configure driver only if associated */
 401         if (ifmgd->associated) {
 402                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 403                 ieee80211_bss_info_change_notify(sdata,
 404                                                  BSS_CHANGED_ARP_FILTER);
 405         }
 406
 407         mutex_unlock(&ifmgd->mtx);
 408
 409         return NOTIFY_DONE;
 410 }
 411 #endif
 412
 413 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 414 {
 415         struct ieee80211_local *local =
 416                 container_of(napi, struct ieee80211_local, napi);
 417
 418         return local->ops->napi_poll(&local->hw, budget);
 419 }
 420
 421 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 422 {
 423         struct ieee80211_local *local = hw_to_local(hw);
 424
 425         napi_schedule(&local->napi);
 426 }
 427 EXPORT_SYMBOL(ieee80211_napi_schedule);
 428
 429 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 430 {
 431         struct ieee80211_local *local = hw_to_local(hw);
 432
 433         napi_complete(&local->napi);
 434 }
 435 EXPORT_SYMBOL(ieee80211_napi_complete);
 436
 437 /* There isn't a lot of sense in it, but you can transmit anything you like */
 438 static const struct ieee80211_txrx_stypes
 439 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 440         [NL80211_IFTYPE_ADHOC] = {
 441                 .tx = 0xffff,
 442                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 443         },
 444         [NL80211_IFTYPE_STATION] = {
 445                 .tx = 0xffff,
 446                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 447                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 448         },
 449         [NL80211_IFTYPE_AP] = {
 450                 .tx = 0xffff,
 451                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 452                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 453                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 454                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 455                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 456                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 457                         BIT(IEEE80211_STYPE_ACTION >> 4),
 458         },
 459         [NL80211_IFTYPE_AP_VLAN] = {
 460                 /* copy AP */
 461                 .tx = 0xffff,
 462                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 463                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 464                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 465                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 466                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 467                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 468                         BIT(IEEE80211_STYPE_ACTION >> 4),
 469         },
 470         [NL80211_IFTYPE_P2P_CLIENT] = {
 471                 .tx = 0xffff,
 472                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 474         },
 475         [NL80211_IFTYPE_P2P_GO] = {
 476                 .tx = 0xffff,
 477                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 478                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 479                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 480                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 481                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 482                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 483                         BIT(IEEE80211_STYPE_ACTION >> 4),
 484         },
 485 };
 486
 487 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 488                                         const struct ieee80211_ops *ops)
 489 {
 490         struct ieee80211_local *local;
 491         int priv_size, i;
 492         struct wiphy *wiphy;
 493
 494         /* Ensure 32-byte alignment of our private data and hw private data.
 495          * We use the wiphy priv data for both our ieee80211_local and for
 496          * the driver's private data
 497          *
 498          * In memory it'll be like this:
 499          *
 500          * +-------------------------+
 501          * | struct wiphy           |
 502          * +-------------------------+
 503          * | struct ieee80211_local  |
 504          * +-------------------------+
 505          * | driver's private data   |
 506          * +-------------------------+
 507          *
 508          */
 509         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 510
 511         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 512
 513         if (!wiphy)
 514                 return NULL;
 515
 516         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 517
 518         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 519                         WIPHY_FLAG_4ADDR_AP |
 520                         WIPHY_FLAG_4ADDR_STATION;
 521         wiphy->privid = mac80211_wiphy_privid;
 522
 523         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 524
 525         local = wiphy_priv(wiphy);
 526
 527         local->hw.wiphy = wiphy;
 528
 529         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 530
 531         BUG_ON(!ops->tx);
 532         BUG_ON(!ops->start);
 533         BUG_ON(!ops->stop);
 534         BUG_ON(!ops->config);
 535         BUG_ON(!ops->add_interface);
 536         BUG_ON(!ops->remove_interface);
 537         BUG_ON(!ops->configure_filter);
 538         local->ops = ops;
 539
 540         /* set up some defaults */
 541         local->hw.queues = 1;
 542         local->hw.max_rates = 1;
 543         local->hw.max_report_rates = 0;
 544         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 545         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 546         local->user_power_level = -1;
 547         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 548         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 549
 550         INIT_LIST_HEAD(&local->interfaces);
 551
 552         __hw_addr_init(&local->mc_list);
 553
 554         mutex_init(&local->iflist_mtx);
 555         mutex_init(&local->mtx);
 556
 557         mutex_init(&local->key_mtx);
 558         spin_lock_init(&local->filter_lock);
 559         spin_lock_init(&local->queue_stop_reason_lock);
 560
 561         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 562
 563         ieee80211_work_init(local);
 564
 565         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 566
 567         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 568         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 569         local->smps_mode = IEEE80211_SMPS_OFF;
 570
 571         INIT_WORK(&local->dynamic_ps_enable_work,
 572                   ieee80211_dynamic_ps_enable_work);
 573         INIT_WORK(&local->dynamic_ps_disable_work,
 574                   ieee80211_dynamic_ps_disable_work);
 575         setup_timer(&local->dynamic_ps_timer,
 576                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 577
 578         sta_info_init(local);
 579
 580         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 581                 skb_queue_head_init(&local->pending[i]);
 582                 atomic_set(&local->agg_queue_stop[i], 0);
 583         }
 584         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 585                      (unsigned long)local);
 586
 587         tasklet_init(&local->tasklet,
 588                      ieee80211_tasklet_handler,
 589                      (unsigned long) local);
 590
 591         skb_queue_head_init(&local->skb_queue);
 592         skb_queue_head_init(&local->skb_queue_unreliable);
 593
 594         /* init dummy netdev for use w/ NAPI */
 595         init_dummy_netdev(&local->napi_dev);
 596
 597         return local_to_hw(local);
 598 }
 599 EXPORT_SYMBOL(ieee80211_alloc_hw);
 600
 601 int ieee80211_register_hw(struct ieee80211_hw *hw)
 602 {
 603         struct ieee80211_local *local = hw_to_local(hw);
 604         int result;
 605         enum ieee80211_band band;
 606         int channels, max_bitrates;
 607         bool supp_ht;
 608         static const u32 cipher_suites[] = {
 609                 /* keep WEP first, it may be removed below */
 610                 WLAN_CIPHER_SUITE_WEP40,
 611                 WLAN_CIPHER_SUITE_WEP104,
 612                 WLAN_CIPHER_SUITE_TKIP,
 613                 WLAN_CIPHER_SUITE_CCMP,
 614
 615                 /* keep last -- depends on hw flags! */
 616                 WLAN_CIPHER_SUITE_AES_CMAC
 617         };
 618
 619         if (hw->max_report_rates == 0)
 620                 hw->max_report_rates = hw->max_rates;
 621
 622         /*
 623          * generic code guarantees at least one band,
 624          * set this very early because much code assumes
 625          * that hw.conf.channel is assigned
 626          */
 627         channels = 0;
 628         max_bitrates = 0;
 629         supp_ht = false;
 630         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 631                 struct ieee80211_supported_band *sband;
 632
 633                 sband = local->hw.wiphy->bands[band];
 634                 if (!sband)
 635                         continue;
 636                 if (!local->oper_channel) {
 637                         /* init channel we're on */
 638                         local->hw.conf.channel =
 639                         local->oper_channel = &sband->channels[0];
 640                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 641                 }
 642                 channels += sband->n_channels;
 643
 644                 if (max_bitrates < sband->n_bitrates)
 645                         max_bitrates = sband->n_bitrates;
 646                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 647         }
 648
 649         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 650                                       sizeof(void *) * channels, GFP_KERNEL);
 651         if (!local->int_scan_req)
 652                 return -ENOMEM;
 653
 654         /* if low-level driver supports AP, we also support VLAN */
 655         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 656                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 657
 658         /* mac80211 always supports monitor */
 659         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 660
 661 #ifndef CONFIG_MAC80211_MESH
 662         /* mesh depends on Kconfig, but drivers should set it if they want */
 663         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 664 #endif
 665
 666         /* mac80211 supports control port protocol changing */
 667         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 668
 669         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 670                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 671         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 672                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 673
 674         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 675              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 676              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 677
 678         /*
 679          * Calculate scan IE length -- we need this to alloc
 680          * memory and to subtract from the driver limit. It
 681          * includes the DS Params, (extended) supported rates, and HT
 682          * information -- SSID is the driver's responsibility.
 683          */
 684         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 685                 3 /* DS Params */;
 686         if (supp_ht)
 687                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 688
 689         if (!local->ops->hw_scan) {
 690                 /* For hw_scan, driver needs to set these up. */
 691                 local->hw.wiphy->max_scan_ssids = 4;
 692                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 693         }
 694
 695         /*
 696          * If the driver supports any scan IEs, then assume the
 697          * limit includes the IEs mac80211 will add, otherwise
 698          * leave it at zero and let the driver sort it out; we
 699          * still pass our IEs to the driver but userspace will
 700          * not be allowed to in that case.
 701          */
 702         if (local->hw.wiphy->max_scan_ie_len)
 703                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 704
 705         /* Set up cipher suites unless driver already did */
 706         if (!local->hw.wiphy->cipher_suites) {
 707                 local->hw.wiphy->cipher_suites = cipher_suites;
 708                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 709                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 710                         local->hw.wiphy->n_cipher_suites--;
 711         }
 712         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 713                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 714                         local->hw.wiphy->cipher_suites += 2;
 715                         local->hw.wiphy->n_cipher_suites -= 2;
 716                 } else {
 717                         u32 *suites;
 718                         int r, w = 0;
 719
 720                         /* Filter out WEP */
 721
 722                         suites = kmemdup(
 723                                 local->hw.wiphy->cipher_suites,
 724                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 725                                 GFP_KERNEL);
 726                         if (!suites)
 727                                 return -ENOMEM;
 728                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 729                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 730                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 731                                     suite == WLAN_CIPHER_SUITE_WEP104)
 732                                         continue;
 733                                 suites[w++] = suite;
 734                         }
 735                         local->hw.wiphy->cipher_suites = suites;
 736                         local->hw.wiphy->n_cipher_suites = w;
 737                         local->wiphy_ciphers_allocated = true;
 738                 }
 739         }
 740
 741         result = wiphy_register(local->hw.wiphy);
 742         if (result < 0)
 743                 goto fail_wiphy_register;
 744
 745         /*
 746          * We use the number of queues for feature tests (QoS, HT) internally
 747          * so restrict them appropriately.
 748          */
 749         if (hw->queues > IEEE80211_MAX_QUEUES)
 750                 hw->queues = IEEE80211_MAX_QUEUES;
 751
 752         local->workqueue =
 753                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 754         if (!local->workqueue) {
 755                 result = -ENOMEM;
 756                 goto fail_workqueue;
 757         }
 758
 759         /*
 760          * The hardware needs headroom for sending the frame,
 761          * and we need some headroom for passing the frame to monitor
 762          * interfaces, but never both at the same time.
 763          */
 764         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 765                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 766         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 767                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 768
 769         debugfs_hw_add(local);
 770
 771         /*
 772          * if the driver doesn't specify a max listen interval we
 773          * use 5 which should be a safe default
 774          */
 775         if (local->hw.max_listen_interval == 0)
 776                 local->hw.max_listen_interval = 5;
 777
 778         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 779
 780         local->dynamic_ps_forced_timeout = -1;
 781
 782         result = sta_info_start(local);
 783         if (result < 0)
 784                 goto fail_sta_info;
 785
 786         result = ieee80211_wep_init(local);
 787         if (result < 0)
 788                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 789                             result);
 790
 791         rtnl_lock();
 792
 793         result = ieee80211_init_rate_ctrl_alg(local,
 794                                               hw->rate_control_algorithm);
 795         if (result < 0) {
 796                 wiphy_debug(local->hw.wiphy,
 797                             "Failed to initialize rate control algorithm\n");
 798                 goto fail_rate;
 799         }
 800
 801         /* add one default STA interface if supported */
 802         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 803                 result = ieee80211_if_add(local, "wlan%d", NULL,
 804                                           NL80211_IFTYPE_STATION, NULL);
 805                 if (result)
 806                         wiphy_warn(local->hw.wiphy,
 807                                    "Failed to add default virtual iface\n");
 808         }
 809
 810         rtnl_unlock();
 811
 812         ieee80211_led_init(local);
 813
 814         local->network_latency_notifier.notifier_call =
 815                 ieee80211_max_network_latency;
 816         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 817                                      &local->network_latency_notifier);
 818         if (result) {
 819                 rtnl_lock();
 820                 goto fail_pm_qos;
 821         }
 822
 823 #ifdef CONFIG_INET
 824         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 825         result = register_inetaddr_notifier(&local->ifa_notifier);
 826         if (result)
 827                 goto fail_ifa;
 828 #endif
 829
 830         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 831                         local->hw.napi_weight);
 832
 833         return 0;
 834
 835 #ifdef CONFIG_INET
 836  fail_ifa:
 837         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 838                                &local->network_latency_notifier);
 839         rtnl_lock();
 840 #endif
 841  fail_pm_qos:
 842         ieee80211_led_exit(local);
 843         ieee80211_remove_interfaces(local);
 844  fail_rate:
 845         rtnl_unlock();
 846         ieee80211_wep_free(local);
 847         sta_info_stop(local);
 848  fail_sta_info:
 849         destroy_workqueue(local->workqueue);
 850  fail_workqueue:
 851         wiphy_unregister(local->hw.wiphy);
 852  fail_wiphy_register:
 853         if (local->wiphy_ciphers_allocated)
 854                 kfree(local->hw.wiphy->cipher_suites);
 855         kfree(local->int_scan_req);
 856         return result;
 857 }
 858 EXPORT_SYMBOL(ieee80211_register_hw);
 859
 860 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 861 {
 862         struct ieee80211_local *local = hw_to_local(hw);
 863
 864         tasklet_kill(&local->tx_pending_tasklet);
 865         tasklet_kill(&local->tasklet);
 866
 867         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 868                                &local->network_latency_notifier);
 869 #ifdef CONFIG_INET
 870         unregister_inetaddr_notifier(&local->ifa_notifier);
 871 #endif
 872
 873         rtnl_lock();
 874
 875         /*
 876          * At this point, interface list manipulations are fine
 877          * because the driver cannot be handing us frames any
 878          * more and the tasklet is killed.
 879          */
 880         ieee80211_remove_interfaces(local);
 881
 882         rtnl_unlock();
 883
 884         /*
 885          * Now all work items will be gone, but the
 886          * timer might still be armed, so delete it
 887          */
 888         del_timer_sync(&local->work_timer);
 889
 890         cancel_work_sync(&local->restart_work);
 891         cancel_work_sync(&local->reconfig_filter);
 892
 893         ieee80211_clear_tx_pending(local);
 894         sta_info_stop(local);
 895         rate_control_deinitialize(local);
 896
 897         if (skb_queue_len(&local->skb_queue) ||
 898             skb_queue_len(&local->skb_queue_unreliable))
 899                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
 900         skb_queue_purge(&local->skb_queue);
 901         skb_queue_purge(&local->skb_queue_unreliable);
 902
 903         destroy_workqueue(local->workqueue);
 904         wiphy_unregister(local->hw.wiphy);
 905         ieee80211_wep_free(local);
 906         ieee80211_led_exit(local);
 907         kfree(local->int_scan_req);
 908 }
 909 EXPORT_SYMBOL(ieee80211_unregister_hw);
 910
 911 void ieee80211_free_hw(struct ieee80211_hw *hw)
 912 {
 913         struct ieee80211_local *local = hw_to_local(hw);
 914
 915         mutex_destroy(&local->iflist_mtx);
 916         mutex_destroy(&local->mtx);
 917
 918         if (local->wiphy_ciphers_allocated)
 919                 kfree(local->hw.wiphy->cipher_suites);
 920
 921         wiphy_free(local->hw.wiphy);
 922 }
 923 EXPORT_SYMBOL(ieee80211_free_hw);
 924
 925 static int __init ieee80211_init(void)
 926 {
 927         struct sk_buff *skb;
 928         int ret;
 929
 930         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 931         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 932                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 933
 934         ret = rc80211_minstrel_init();
 935         if (ret)
 936                 return ret;
 937
 938         ret = rc80211_minstrel_ht_init();
 939         if (ret)
 940                 goto err_minstrel;
 941
 942         ret = rc80211_pid_init();
 943         if (ret)
 944                 goto err_pid;
 945
 946         ret = ieee80211_iface_init();
 947         if (ret)
 948                 goto err_netdev;
 949
 950         return 0;
 951  err_netdev:
 952         rc80211_pid_exit();
 953  err_pid:
 954         rc80211_minstrel_ht_exit();
 955  err_minstrel:
 956         rc80211_minstrel_exit();
 957
 958         return ret;
 959 }
 960
 961 static void __exit ieee80211_exit(void)
 962 {
 963         rc80211_pid_exit();
 964         rc80211_minstrel_ht_exit();
 965         rc80211_minstrel_exit();
 966
 967         if (mesh_allocated)
 968                 ieee80211s_stop();
 969
 970         ieee80211_iface_exit();
 971 }
 972
 973
 974 subsys_initcall(ieee80211_init);
 975 module_exit(ieee80211_exit);
 976
 977 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 978 MODULE_LICENSE("GPL");