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 || test_bit(SCAN_SW_SCANNING, &local->scanning))
  51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  52
  53         if (local->fif_probe_req || local->probe_req_reg)
  54                 new_flags |= FIF_PROBE_REQ;
  55
  56         if (local->fif_fcsfail)
  57                 new_flags |= FIF_FCSFAIL;
  58
  59         if (local->fif_plcpfail)
  60                 new_flags |= FIF_PLCPFAIL;
  61
  62         if (local->fif_control)
  63                 new_flags |= FIF_CONTROL;
  64
  65         if (local->fif_other_bss)
  66                 new_flags |= FIF_OTHER_BSS;
  67
  68         if (local->fif_pspoll)
  69                 new_flags |= FIF_PSPOLL;
  70
  71         spin_lock_bh(&local->filter_lock);
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         mc = drv_prepare_multicast(local, &local->mc_list);
  75         spin_unlock_bh(&local->filter_lock);
  76
  77         /* be a bit nasty */
  78         new_flags |= (1<<31);
  79
  80         drv_configure_filter(local, changed_flags, &new_flags, mc);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 static void ieee80211_reconfig_filter(struct work_struct *work)
  88 {
  89         struct ieee80211_local *local =
  90                 container_of(work, struct ieee80211_local, reconfig_filter);
  91
  92         ieee80211_configure_filter(local);
  93 }
  94
  95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  96 {
  97         struct ieee80211_channel *chan;
  98         int ret = 0;
  99         int power;
 100         enum nl80211_channel_type channel_type;
 101         u32 offchannel_flag;
 102
 103         might_sleep();
 104
 105         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
 106          * may need to change as well.
 107          */
 108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 109         if (local->scan_channel) {
 110                 chan = local->scan_channel;
 111                 /* If scanning on oper channel, use whatever channel-type
 112                  * is currently in use.
 113                  */
 114                 if (chan == local->oper_channel)
 115                         channel_type = local->_oper_channel_type;
 116                 else
 117                         channel_type = NL80211_CHAN_NO_HT;
 118         } else if (local->tmp_channel) {
 119                 chan = local->tmp_channel;
 120                 channel_type = local->tmp_channel_type;
 121         } else {
 122                 chan = local->oper_channel;
 123                 channel_type = local->_oper_channel_type;
 124         }
 125
 126         if (chan != local->oper_channel ||
 127             channel_type != local->_oper_channel_type)
 128                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 129         else
 130                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 131
 132         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 133
 134         if (offchannel_flag || chan != local->hw.conf.channel ||
 135             channel_type != local->hw.conf.channel_type) {
 136                 local->hw.conf.channel = chan;
 137                 local->hw.conf.channel_type = channel_type;
 138                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 139         }
 140
 141         if (!conf_is_ht(&local->hw.conf)) {
 142                 /*
 143                  * mac80211.h documents that this is only valid
 144                  * when the channel is set to an HT type, and
 145                  * that otherwise STATIC is used.
 146                  */
 147                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 148         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 149                 local->hw.conf.smps_mode = local->smps_mode;
 150                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 151         }
 152
 153         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 154             test_bit(SCAN_HW_SCANNING, &local->scanning))
 155                 power = chan->max_power;
 156         else
 157                 power = local->power_constr_level ?
 158                         min(chan->max_power,
 159                                 (chan->max_reg_power  - local->power_constr_level)) :
 160                         chan->max_power;
 161
 162         if (local->user_power_level >= 0)
 163                 power = min(power, local->user_power_level);
 164
 165         if (local->hw.conf.power_level != power) {
 166                 changed |= IEEE80211_CONF_CHANGE_POWER;
 167                 local->hw.conf.power_level = power;
 168         }
 169
 170         if (changed && local->open_count) {
 171                 ret = drv_config(local, changed);
 172                 /*
 173                  * Goal:
 174                  * HW reconfiguration should never fail, the driver has told
 175                  * us what it can support so it should live up to that promise.
 176                  *
 177                  * Current status:
 178                  * rfkill is not integrated with mac80211 and a
 179                  * configuration command can thus fail if hardware rfkill
 180                  * is enabled
 181                  *
 182                  * FIXME: integrate rfkill with mac80211 and then add this
 183                  * WARN_ON() back
 184                  *
 185                  */
 186                 /* WARN_ON(ret); */
 187         }
 188
 189         return ret;
 190 }
 191
 192 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 193                                       u32 changed)
 194 {
 195         struct ieee80211_local *local = sdata->local;
 196         static const u8 zero[ETH_ALEN] = { 0 };
 197
 198         if (!changed)
 199                 return;
 200
 201         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 202                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 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(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 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 #ifdef CONFIG_MAC80211_MESH
 249                         case NL80211_IFTYPE_MESH_POINT:
 250                                 sdata->vif.bss_conf.enable_beacon =
 251                                         !!sdata->u.mesh.mesh_id_len;
 252                                 break;
 253 #endif
 254                         default:
 255                                 /* not reached */
 256                                 WARN_ON(1);
 257                                 break;
 258                         }
 259                 }
 260         }
 261
 262         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 263 }
 264
 265 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 266 {
 267         sdata->vif.bss_conf.use_cts_prot = false;
 268         sdata->vif.bss_conf.use_short_preamble = false;
 269         sdata->vif.bss_conf.use_short_slot = false;
 270         return BSS_CHANGED_ERP_CTS_PROT |
 271                BSS_CHANGED_ERP_PREAMBLE |
 272                BSS_CHANGED_ERP_SLOT;
 273 }
 274
 275 static void ieee80211_tasklet_handler(unsigned long data)
 276 {
 277         struct ieee80211_local *local = (struct ieee80211_local *) data;
 278         struct sta_info *sta, *tmp;
 279         struct skb_eosp_msg_data *eosp_data;
 280         struct sk_buff *skb;
 281
 282         while ((skb = skb_dequeue(&local->skb_queue)) ||
 283                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 284                 switch (skb->pkt_type) {
 285                 case IEEE80211_RX_MSG:
 286                         /* Clear skb->pkt_type in order to not confuse kernel
 287                          * netstack. */
 288                         skb->pkt_type = 0;
 289                         ieee80211_rx(&local->hw, skb);
 290                         break;
 291                 case IEEE80211_TX_STATUS_MSG:
 292                         skb->pkt_type = 0;
 293                         ieee80211_tx_status(&local->hw, skb);
 294                         break;
 295                 case IEEE80211_EOSP_MSG:
 296                         eosp_data = (void *)skb->cb;
 297                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 298                                 /* skip wrong virtual interface */
 299                                 if (memcmp(eosp_data->iface,
 300                                            sta->sdata->vif.addr, ETH_ALEN))
 301                                         continue;
 302                                 clear_sta_flag(sta, WLAN_STA_SP);
 303                                 break;
 304                         }
 305                         dev_kfree_skb(skb);
 306                         break;
 307                 default:
 308                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 309                              skb->pkt_type);
 310                         dev_kfree_skb(skb);
 311                         break;
 312                 }
 313         }
 314 }
 315
 316 static void ieee80211_restart_work(struct work_struct *work)
 317 {
 318         struct ieee80211_local *local =
 319                 container_of(work, struct ieee80211_local, restart_work);
 320
 321         /* wait for scan work complete */
 322         flush_workqueue(local->workqueue);
 323
 324         mutex_lock(&local->mtx);
 325         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 326              local->sched_scanning,
 327                 "%s called with hardware scan in progress\n", __func__);
 328         mutex_unlock(&local->mtx);
 329
 330         rtnl_lock();
 331         ieee80211_scan_cancel(local);
 332         ieee80211_reconfig(local);
 333         rtnl_unlock();
 334 }
 335
 336 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 337 {
 338         struct ieee80211_local *local = hw_to_local(hw);
 339
 340         trace_api_restart_hw(local);
 341
 342         wiphy_info(hw->wiphy,
 343                    "Hardware restart was requested\n");
 344
 345         /* use this reason, ieee80211_reconfig will unblock it */
 346         ieee80211_stop_queues_by_reason(hw,
 347                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 348
 349         schedule_work(&local->restart_work);
 350 }
 351 EXPORT_SYMBOL(ieee80211_restart_hw);
 352
 353 static void ieee80211_recalc_smps_work(struct work_struct *work)
 354 {
 355         struct ieee80211_local *local =
 356                 container_of(work, struct ieee80211_local, recalc_smps);
 357
 358         mutex_lock(&local->iflist_mtx);
 359         ieee80211_recalc_smps(local);
 360         mutex_unlock(&local->iflist_mtx);
 361 }
 362
 363 #ifdef CONFIG_INET
 364 static int ieee80211_ifa_changed(struct notifier_block *nb,
 365                                  unsigned long data, void *arg)
 366 {
 367         struct in_ifaddr *ifa = arg;
 368         struct ieee80211_local *local =
 369                 container_of(nb, struct ieee80211_local,
 370                              ifa_notifier);
 371         struct net_device *ndev = ifa->ifa_dev->dev;
 372         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 373         struct in_device *idev;
 374         struct ieee80211_sub_if_data *sdata;
 375         struct ieee80211_bss_conf *bss_conf;
 376         struct ieee80211_if_managed *ifmgd;
 377         int c = 0;
 378
 379         /* Make sure it's our interface that got changed */
 380         if (!wdev)
 381                 return NOTIFY_DONE;
 382
 383         if (wdev->wiphy != local->hw.wiphy)
 384                 return NOTIFY_DONE;
 385
 386         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 387         bss_conf = &sdata->vif.bss_conf;
 388
 389         /* ARP filtering is only supported in managed mode */
 390         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 391                 return NOTIFY_DONE;
 392
 393         idev = __in_dev_get_rtnl(sdata->dev);
 394         if (!idev)
 395                 return NOTIFY_DONE;
 396
 397         ifmgd = &sdata->u.mgd;
 398         mutex_lock(&ifmgd->mtx);
 399
 400         /* Copy the addresses to the bss_conf list */
 401         ifa = idev->ifa_list;
 402         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 403                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 404                 ifa = ifa->ifa_next;
 405                 c++;
 406         }
 407
 408         /* If not all addresses fit the list, disable filtering */
 409         if (ifa) {
 410                 sdata->arp_filter_state = false;
 411                 c = 0;
 412         } else {
 413                 sdata->arp_filter_state = true;
 414         }
 415         bss_conf->arp_addr_cnt = c;
 416
 417         /* Configure driver only if associated (which also implies it is up) */
 418         if (ifmgd->associated) {
 419                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 420                 ieee80211_bss_info_change_notify(sdata,
 421                                                  BSS_CHANGED_ARP_FILTER);
 422         }
 423
 424         mutex_unlock(&ifmgd->mtx);
 425
 426         return NOTIFY_DONE;
 427 }
 428 #endif
 429
 430 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 431 {
 432         struct ieee80211_local *local =
 433                 container_of(napi, struct ieee80211_local, napi);
 434
 435         return local->ops->napi_poll(&local->hw, budget);
 436 }
 437
 438 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 439 {
 440         struct ieee80211_local *local = hw_to_local(hw);
 441
 442         napi_schedule(&local->napi);
 443 }
 444 EXPORT_SYMBOL(ieee80211_napi_schedule);
 445
 446 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 447 {
 448         struct ieee80211_local *local = hw_to_local(hw);
 449
 450         napi_complete(&local->napi);
 451 }
 452 EXPORT_SYMBOL(ieee80211_napi_complete);
 453
 454 /* There isn't a lot of sense in it, but you can transmit anything you like */
 455 static const struct ieee80211_txrx_stypes
 456 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 457         [NL80211_IFTYPE_ADHOC] = {
 458                 .tx = 0xffff,
 459                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 460         },
 461         [NL80211_IFTYPE_STATION] = {
 462                 .tx = 0xffff,
 463                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 464                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 465         },
 466         [NL80211_IFTYPE_AP] = {
 467                 .tx = 0xffff,
 468                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 469                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 470                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 471                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 472                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 473                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 474                         BIT(IEEE80211_STYPE_ACTION >> 4),
 475         },
 476         [NL80211_IFTYPE_AP_VLAN] = {
 477                 /* copy AP */
 478                 .tx = 0xffff,
 479                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 480                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 481                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 482                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 483                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 484                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 485                         BIT(IEEE80211_STYPE_ACTION >> 4),
 486         },
 487         [NL80211_IFTYPE_P2P_CLIENT] = {
 488                 .tx = 0xffff,
 489                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 490                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 491         },
 492         [NL80211_IFTYPE_P2P_GO] = {
 493                 .tx = 0xffff,
 494                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 495                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 496                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 497                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 498                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 499                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 500                         BIT(IEEE80211_STYPE_ACTION >> 4),
 501         },
 502         [NL80211_IFTYPE_MESH_POINT] = {
 503                 .tx = 0xffff,
 504                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 505                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 506                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 507         },
 508 };
 509
 510 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 511         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 512                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 513
 514         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 515                                 IEEE80211_HT_CAP_MAX_AMSDU |
 516                                 IEEE80211_HT_CAP_SGI_40),
 517         .mcs = {
 518                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 519                              0xff, 0xff, 0xff, 0xff, 0xff, },
 520         },
 521 };
 522
 523 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 524                                         const struct ieee80211_ops *ops)
 525 {
 526         struct ieee80211_local *local;
 527         int priv_size, i;
 528         struct wiphy *wiphy;
 529
 530         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 531                 return NULL;
 532
 533         /* Ensure 32-byte alignment of our private data and hw private data.
 534          * We use the wiphy priv data for both our ieee80211_local and for
 535          * the driver's private data
 536          *
 537          * In memory it'll be like this:
 538          *
 539          * +-------------------------+
 540          * | struct wiphy           |
 541          * +-------------------------+
 542          * | struct ieee80211_local  |
 543          * +-------------------------+
 544          * | driver's private data   |
 545          * +-------------------------+
 546          *
 547          */
 548         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 549
 550         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 551
 552         if (!wiphy)
 553                 return NULL;
 554
 555         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 556
 557         wiphy->privid = mac80211_wiphy_privid;
 558
 559         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 560                         WIPHY_FLAG_4ADDR_AP |
 561                         WIPHY_FLAG_4ADDR_STATION |
 562                         WIPHY_FLAG_REPORTS_OBSS |
 563                         WIPHY_FLAG_OFFCHAN_TX |
 564                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 565
 566         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 567                           NL80211_FEATURE_HT_IBSS;
 568
 569         if (!ops->set_key)
 570                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 571
 572         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 573
 574         local = wiphy_priv(wiphy);
 575
 576         local->hw.wiphy = wiphy;
 577
 578         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 579
 580         BUG_ON(!ops->tx && !ops->tx_frags);
 581         BUG_ON(!ops->start);
 582         BUG_ON(!ops->stop);
 583         BUG_ON(!ops->config);
 584         BUG_ON(!ops->add_interface);
 585         BUG_ON(!ops->remove_interface);
 586         BUG_ON(!ops->configure_filter);
 587         local->ops = ops;
 588
 589         /* set up some defaults */
 590         local->hw.queues = 1;
 591         local->hw.max_rates = 1;
 592         local->hw.max_report_rates = 0;
 593         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 594         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 595         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 596         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 597         local->user_power_level = -1;
 598         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 599
 600         INIT_LIST_HEAD(&local->interfaces);
 601
 602         __hw_addr_init(&local->mc_list);
 603
 604         mutex_init(&local->iflist_mtx);
 605         mutex_init(&local->mtx);
 606
 607         mutex_init(&local->key_mtx);
 608         spin_lock_init(&local->filter_lock);
 609         spin_lock_init(&local->queue_stop_reason_lock);
 610
 611         /*
 612          * The rx_skb_queue is only accessed from tasklets,
 613          * but other SKB queues are used from within IRQ
 614          * context. Therefore, this one needs a different
 615          * locking class so our direct, non-irq-safe use of
 616          * the queue's lock doesn't throw lockdep warnings.
 617          */
 618         skb_queue_head_init_class(&local->rx_skb_queue,
 619                                   &ieee80211_rx_skb_queue_class);
 620
 621         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 622
 623         ieee80211_work_init(local);
 624
 625         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 626
 627         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 628         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 629         local->smps_mode = IEEE80211_SMPS_OFF;
 630
 631         INIT_WORK(&local->dynamic_ps_enable_work,
 632                   ieee80211_dynamic_ps_enable_work);
 633         INIT_WORK(&local->dynamic_ps_disable_work,
 634                   ieee80211_dynamic_ps_disable_work);
 635         setup_timer(&local->dynamic_ps_timer,
 636                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 637
 638         INIT_WORK(&local->sched_scan_stopped_work,
 639                   ieee80211_sched_scan_stopped_work);
 640
 641         spin_lock_init(&local->ack_status_lock);
 642         idr_init(&local->ack_status_frames);
 643         /* preallocate at least one entry */
 644         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 645
 646         sta_info_init(local);
 647
 648         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 649                 skb_queue_head_init(&local->pending[i]);
 650                 atomic_set(&local->agg_queue_stop[i], 0);
 651         }
 652         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 653                      (unsigned long)local);
 654
 655         tasklet_init(&local->tasklet,
 656                      ieee80211_tasklet_handler,
 657                      (unsigned long) local);
 658
 659         skb_queue_head_init(&local->skb_queue);
 660         skb_queue_head_init(&local->skb_queue_unreliable);
 661
 662         /* init dummy netdev for use w/ NAPI */
 663         init_dummy_netdev(&local->napi_dev);
 664
 665         ieee80211_led_names(local);
 666
 667         ieee80211_hw_roc_setup(local);
 668
 669         return &local->hw;
 670 }
 671 EXPORT_SYMBOL(ieee80211_alloc_hw);
 672
 673 int ieee80211_register_hw(struct ieee80211_hw *hw)
 674 {
 675         struct ieee80211_local *local = hw_to_local(hw);
 676         int result, i;
 677         enum ieee80211_band band;
 678         int channels, max_bitrates;
 679         bool supp_ht;
 680         static const u32 cipher_suites[] = {
 681                 /* keep WEP first, it may be removed below */
 682                 WLAN_CIPHER_SUITE_WEP40,
 683                 WLAN_CIPHER_SUITE_WEP104,
 684                 WLAN_CIPHER_SUITE_TKIP,
 685                 WLAN_CIPHER_SUITE_CCMP,
 686
 687                 /* keep last -- depends on hw flags! */
 688                 WLAN_CIPHER_SUITE_AES_CMAC
 689         };
 690
 691         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 692 #ifdef CONFIG_PM
 693             && (!local->ops->suspend || !local->ops->resume)
 694 #endif
 695             )
 696                 return -EINVAL;
 697
 698         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 699                 return -EINVAL;
 700
 701         if (hw->max_report_rates == 0)
 702                 hw->max_report_rates = hw->max_rates;
 703
 704         /*
 705          * generic code guarantees at least one band,
 706          * set this very early because much code assumes
 707          * that hw.conf.channel is assigned
 708          */
 709         channels = 0;
 710         max_bitrates = 0;
 711         supp_ht = false;
 712         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 713                 struct ieee80211_supported_band *sband;
 714
 715                 sband = local->hw.wiphy->bands[band];
 716                 if (!sband)
 717                         continue;
 718                 if (!local->oper_channel) {
 719                         /* init channel we're on */
 720                         local->hw.conf.channel =
 721                         local->oper_channel = &sband->channels[0];
 722                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 723                 }
 724                 channels += sband->n_channels;
 725
 726                 if (max_bitrates < sband->n_bitrates)
 727                         max_bitrates = sband->n_bitrates;
 728                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 729         }
 730
 731         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 732                                       sizeof(void *) * channels, GFP_KERNEL);
 733         if (!local->int_scan_req)
 734                 return -ENOMEM;
 735
 736         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 737                 if (!local->hw.wiphy->bands[band])
 738                         continue;
 739                 local->int_scan_req->rates[band] = (u32) -1;
 740         }
 741
 742         /* if low-level driver supports AP, we also support VLAN */
 743         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 744                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 745                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 746         }
 747
 748         /* mac80211 always supports monitor */
 749         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 750         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 751
 752         /*
 753          * mac80211 doesn't support more than 1 channel, and also not more
 754          * than one IBSS interface
 755          */
 756         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 757                 const struct ieee80211_iface_combination *c;
 758                 int j;
 759
 760                 c = &hw->wiphy->iface_combinations[i];
 761
 762                 if (c->num_different_channels > 1)
 763                         return -EINVAL;
 764
 765                 for (j = 0; j < c->n_limits; j++)
 766                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 767                             c->limits[j].max > 1)
 768                                 return -EINVAL;
 769         }
 770
 771 #ifndef CONFIG_MAC80211_MESH
 772         /* mesh depends on Kconfig, but drivers should set it if they want */
 773         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 774 #endif
 775
 776         /* if the underlying driver supports mesh, mac80211 will (at least)
 777          * provide routing of mesh authentication frames to userspace */
 778         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 779                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 780
 781         /* mac80211 supports control port protocol changing */
 782         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 783
 784         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 785                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 786         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 787                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 788
 789         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 790              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 791              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 792
 793         /*
 794          * Calculate scan IE length -- we need this to alloc
 795          * memory and to subtract from the driver limit. It
 796          * includes the DS Params, (extended) supported rates, and HT
 797          * information -- SSID is the driver's responsibility.
 798          */
 799         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 800                 3 /* DS Params */;
 801         if (supp_ht)
 802                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 803
 804         if (!local->ops->hw_scan) {
 805                 /* For hw_scan, driver needs to set these up. */
 806                 local->hw.wiphy->max_scan_ssids = 4;
 807                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 808         }
 809
 810         /*
 811          * If the driver supports any scan IEs, then assume the
 812          * limit includes the IEs mac80211 will add, otherwise
 813          * leave it at zero and let the driver sort it out; we
 814          * still pass our IEs to the driver but userspace will
 815          * not be allowed to in that case.
 816          */
 817         if (local->hw.wiphy->max_scan_ie_len)
 818                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 819
 820         /* Set up cipher suites unless driver already did */
 821         if (!local->hw.wiphy->cipher_suites) {
 822                 local->hw.wiphy->cipher_suites = cipher_suites;
 823                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 824                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 825                         local->hw.wiphy->n_cipher_suites--;
 826         }
 827         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 828                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 829                         local->hw.wiphy->cipher_suites += 2;
 830                         local->hw.wiphy->n_cipher_suites -= 2;
 831                 } else {
 832                         u32 *suites;
 833                         int r, w = 0;
 834
 835                         /* Filter out WEP */
 836
 837                         suites = kmemdup(
 838                                 local->hw.wiphy->cipher_suites,
 839                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 840                                 GFP_KERNEL);
 841                         if (!suites)
 842                                 return -ENOMEM;
 843                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 844                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 845                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 846                                     suite == WLAN_CIPHER_SUITE_WEP104)
 847                                         continue;
 848                                 suites[w++] = suite;
 849                         }
 850                         local->hw.wiphy->cipher_suites = suites;
 851                         local->hw.wiphy->n_cipher_suites = w;
 852                         local->wiphy_ciphers_allocated = true;
 853                 }
 854         }
 855
 856         if (!local->ops->remain_on_channel)
 857                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 858
 859         if (local->ops->sched_scan_start)
 860                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 861
 862         /* mac80211 based drivers don't support internal TDLS setup */
 863         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 864                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 865
 866         result = wiphy_register(local->hw.wiphy);
 867         if (result < 0)
 868                 goto fail_wiphy_register;
 869
 870         /*
 871          * We use the number of queues for feature tests (QoS, HT) internally
 872          * so restrict them appropriately.
 873          */
 874         if (hw->queues > IEEE80211_MAX_QUEUES)
 875                 hw->queues = IEEE80211_MAX_QUEUES;
 876
 877         local->workqueue =
 878                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 879         if (!local->workqueue) {
 880                 result = -ENOMEM;
 881                 goto fail_workqueue;
 882         }
 883
 884         /*
 885          * The hardware needs headroom for sending the frame,
 886          * and we need some headroom for passing the frame to monitor
 887          * interfaces, but never both at the same time.
 888          */
 889         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 890                                    IEEE80211_TX_STATUS_HEADROOM);
 891
 892         debugfs_hw_add(local);
 893
 894         /*
 895          * if the driver doesn't specify a max listen interval we
 896          * use 5 which should be a safe default
 897          */
 898         if (local->hw.max_listen_interval == 0)
 899                 local->hw.max_listen_interval = 5;
 900
 901         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 902
 903         local->dynamic_ps_forced_timeout = -1;
 904
 905         result = ieee80211_wep_init(local);
 906         if (result < 0)
 907                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 908                             result);
 909
 910         ieee80211_led_init(local);
 911
 912         rtnl_lock();
 913
 914         result = ieee80211_init_rate_ctrl_alg(local,
 915                                               hw->rate_control_algorithm);
 916         if (result < 0) {
 917                 wiphy_debug(local->hw.wiphy,
 918                             "Failed to initialize rate control algorithm\n");
 919                 goto fail_rate;
 920         }
 921
 922         /* add one default STA interface if supported */
 923         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 924                 result = ieee80211_if_add(local, "wlan%d", NULL,
 925                                           NL80211_IFTYPE_STATION, NULL);
 926                 if (result)
 927                         wiphy_warn(local->hw.wiphy,
 928                                    "Failed to add default virtual iface\n");
 929         }
 930
 931         rtnl_unlock();
 932
 933         local->network_latency_notifier.notifier_call =
 934                 ieee80211_max_network_latency;
 935         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 936                                      &local->network_latency_notifier);
 937         if (result) {
 938                 rtnl_lock();
 939                 goto fail_pm_qos;
 940         }
 941
 942 #ifdef CONFIG_INET
 943         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 944         result = register_inetaddr_notifier(&local->ifa_notifier);
 945         if (result)
 946                 goto fail_ifa;
 947 #endif
 948
 949         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 950                         local->hw.napi_weight);
 951
 952         return 0;
 953
 954 #ifdef CONFIG_INET
 955  fail_ifa:
 956         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 957                                &local->network_latency_notifier);
 958         rtnl_lock();
 959 #endif
 960  fail_pm_qos:
 961         ieee80211_led_exit(local);
 962         ieee80211_remove_interfaces(local);
 963  fail_rate:
 964         rtnl_unlock();
 965         ieee80211_wep_free(local);
 966         sta_info_stop(local);
 967         destroy_workqueue(local->workqueue);
 968  fail_workqueue:
 969         wiphy_unregister(local->hw.wiphy);
 970  fail_wiphy_register:
 971         if (local->wiphy_ciphers_allocated)
 972                 kfree(local->hw.wiphy->cipher_suites);
 973         kfree(local->int_scan_req);
 974         return result;
 975 }
 976 EXPORT_SYMBOL(ieee80211_register_hw);
 977
 978 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 979 {
 980         struct ieee80211_local *local = hw_to_local(hw);
 981
 982         tasklet_kill(&local->tx_pending_tasklet);
 983         tasklet_kill(&local->tasklet);
 984
 985         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 986                                &local->network_latency_notifier);
 987 #ifdef CONFIG_INET
 988         unregister_inetaddr_notifier(&local->ifa_notifier);
 989 #endif
 990
 991         rtnl_lock();
 992
 993         /*
 994          * At this point, interface list manipulations are fine
 995          * because the driver cannot be handing us frames any
 996          * more and the tasklet is killed.
 997          */
 998         ieee80211_remove_interfaces(local);
 999
1000         rtnl_unlock();
1001
1002         /*
1003          * Now all work items will be gone, but the
1004          * timer might still be armed, so delete it
1005          */
1006         del_timer_sync(&local->work_timer);
1007
1008         cancel_work_sync(&local->restart_work);
1009         cancel_work_sync(&local->reconfig_filter);
1010
1011         ieee80211_clear_tx_pending(local);
1012         rate_control_deinitialize(local);
1013
1014         if (skb_queue_len(&local->skb_queue) ||
1015             skb_queue_len(&local->skb_queue_unreliable))
1016                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1017         skb_queue_purge(&local->skb_queue);
1018         skb_queue_purge(&local->skb_queue_unreliable);
1019         skb_queue_purge(&local->rx_skb_queue);
1020
1021         destroy_workqueue(local->workqueue);
1022         wiphy_unregister(local->hw.wiphy);
1023         sta_info_stop(local);
1024         ieee80211_wep_free(local);
1025         ieee80211_led_exit(local);
1026         kfree(local->int_scan_req);
1027 }
1028 EXPORT_SYMBOL(ieee80211_unregister_hw);
1029
1030 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1031 {
1032         WARN_ONCE(1, "Have pending ack frames!\n");
1033         kfree_skb(p);
1034         return 0;
1035 }
1036
1037 void ieee80211_free_hw(struct ieee80211_hw *hw)
1038 {
1039         struct ieee80211_local *local = hw_to_local(hw);
1040
1041         mutex_destroy(&local->iflist_mtx);
1042         mutex_destroy(&local->mtx);
1043
1044         if (local->wiphy_ciphers_allocated)
1045                 kfree(local->hw.wiphy->cipher_suites);
1046
1047         idr_for_each(&local->ack_status_frames,
1048                      ieee80211_free_ack_frame, NULL);
1049         idr_destroy(&local->ack_status_frames);
1050
1051         wiphy_free(local->hw.wiphy);
1052 }
1053 EXPORT_SYMBOL(ieee80211_free_hw);
1054
1055 static int __init ieee80211_init(void)
1056 {
1057         struct sk_buff *skb;
1058         int ret;
1059
1060         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1061         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1062                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1063
1064         ret = rc80211_minstrel_init();
1065         if (ret)
1066                 return ret;
1067
1068         ret = rc80211_minstrel_ht_init();
1069         if (ret)
1070                 goto err_minstrel;
1071
1072         ret = rc80211_pid_init();
1073         if (ret)
1074                 goto err_pid;
1075
1076         ret = ieee80211_iface_init();
1077         if (ret)
1078                 goto err_netdev;
1079
1080         return 0;
1081  err_netdev:
1082         rc80211_pid_exit();
1083  err_pid:
1084         rc80211_minstrel_ht_exit();
1085  err_minstrel:
1086         rc80211_minstrel_exit();
1087
1088         return ret;
1089 }
1090
1091 static void __exit ieee80211_exit(void)
1092 {
1093         rc80211_pid_exit();
1094         rc80211_minstrel_ht_exit();
1095         rc80211_minstrel_exit();
1096
1097         if (mesh_allocated)
1098                 ieee80211s_stop();
1099
1100         ieee80211_iface_exit();
1101
1102         rcu_barrier();
1103 }
1104
1105
1106 subsys_initcall(ieee80211_init);
1107 module_exit(ieee80211_exit);
1108
1109 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1110 MODULE_LICENSE("GPL");