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