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