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                 /*
 203                  * While not associated, claim a BSSID of all-zeroes
 204                  * so that drivers don't do any weird things with the
 205                  * BSSID at that time.
 206                  */
 207                 if (sdata->vif.bss_conf.assoc)
 208                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 209                 else
 210                         sdata->vif.bss_conf.bssid = zero;
 211         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 212                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 213         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 214                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 215         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 216                 sdata->vif.bss_conf.bssid = NULL;
 217         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 218                 sdata->vif.bss_conf.bssid = zero;
 219         } else {
 220                 WARN_ON(1);
 221                 return;
 222         }
 223
 224         switch (sdata->vif.type) {
 225         case NL80211_IFTYPE_AP:
 226         case NL80211_IFTYPE_ADHOC:
 227         case NL80211_IFTYPE_WDS:
 228         case NL80211_IFTYPE_MESH_POINT:
 229                 break;
 230         default:
 231                 /* do not warn to simplify caller in scan.c */
 232                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 233                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 234                         return;
 235                 break;
 236         }
 237
 238         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 239                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 240                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 241                         sdata->vif.bss_conf.enable_beacon = false;
 242                 } else {
 243                         /*
 244                          * Beacon should be enabled, but AP mode must
 245                          * check whether there is a beacon configured.
 246                          */
 247                         switch (sdata->vif.type) {
 248                         case NL80211_IFTYPE_AP:
 249                                 sdata->vif.bss_conf.enable_beacon =
 250                                         !!sdata->u.ap.beacon;
 251                                 break;
 252                         case NL80211_IFTYPE_ADHOC:
 253                                 sdata->vif.bss_conf.enable_beacon =
 254                                         !!sdata->u.ibss.presp;
 255                                 break;
 256 #ifdef CONFIG_MAC80211_MESH
 257                         case NL80211_IFTYPE_MESH_POINT:
 258                                 sdata->vif.bss_conf.enable_beacon =
 259                                         !!sdata->u.mesh.mesh_id_len;
 260                                 break;
 261 #endif
 262                         default:
 263                                 /* not reached */
 264                                 WARN_ON(1);
 265                                 break;
 266                         }
 267                 }
 268         }
 269
 270         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 271 }
 272
 273 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 274 {
 275         sdata->vif.bss_conf.use_cts_prot = false;
 276         sdata->vif.bss_conf.use_short_preamble = false;
 277         sdata->vif.bss_conf.use_short_slot = false;
 278         return BSS_CHANGED_ERP_CTS_PROT |
 279                BSS_CHANGED_ERP_PREAMBLE |
 280                BSS_CHANGED_ERP_SLOT;
 281 }
 282
 283 static void ieee80211_tasklet_handler(unsigned long data)
 284 {
 285         struct ieee80211_local *local = (struct ieee80211_local *) data;
 286         struct sta_info *sta, *tmp;
 287         struct skb_eosp_msg_data *eosp_data;
 288         struct sk_buff *skb;
 289
 290         while ((skb = skb_dequeue(&local->skb_queue)) ||
 291                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 292                 switch (skb->pkt_type) {
 293                 case IEEE80211_RX_MSG:
 294                         /* Clear skb->pkt_type in order to not confuse kernel
 295                          * netstack. */
 296                         skb->pkt_type = 0;
 297                         ieee80211_rx(local_to_hw(local), skb);
 298                         break;
 299                 case IEEE80211_TX_STATUS_MSG:
 300                         skb->pkt_type = 0;
 301                         ieee80211_tx_status(local_to_hw(local), skb);
 302                         break;
 303                 case IEEE80211_EOSP_MSG:
 304                         eosp_data = (void *)skb->cb;
 305                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 306                                 /* skip wrong virtual interface */
 307                                 if (memcmp(eosp_data->iface,
 308                                            sta->sdata->vif.addr, ETH_ALEN))
 309                                         continue;
 310                                 clear_sta_flag(sta, WLAN_STA_SP);
 311                                 break;
 312                         }
 313                         dev_kfree_skb(skb);
 314                         break;
 315                 default:
 316                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 317                              skb->pkt_type);
 318                         dev_kfree_skb(skb);
 319                         break;
 320                 }
 321         }
 322 }
 323
 324 static void ieee80211_restart_work(struct work_struct *work)
 325 {
 326         struct ieee80211_local *local =
 327                 container_of(work, struct ieee80211_local, restart_work);
 328
 329         /* wait for scan work complete */
 330         flush_workqueue(local->workqueue);
 331
 332         mutex_lock(&local->mtx);
 333         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 334              local->sched_scanning,
 335                 "%s called with hardware scan in progress\n", __func__);
 336         mutex_unlock(&local->mtx);
 337
 338         rtnl_lock();
 339         ieee80211_scan_cancel(local);
 340         ieee80211_reconfig(local);
 341         rtnl_unlock();
 342 }
 343
 344 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 345 {
 346         struct ieee80211_local *local = hw_to_local(hw);
 347
 348         trace_api_restart_hw(local);
 349
 350         wiphy_info(hw->wiphy,
 351                    "Hardware restart was requested\n");
 352
 353         /* use this reason, ieee80211_reconfig will unblock it */
 354         ieee80211_stop_queues_by_reason(hw,
 355                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 356
 357         schedule_work(&local->restart_work);
 358 }
 359 EXPORT_SYMBOL(ieee80211_restart_hw);
 360
 361 static void ieee80211_recalc_smps_work(struct work_struct *work)
 362 {
 363         struct ieee80211_local *local =
 364                 container_of(work, struct ieee80211_local, recalc_smps);
 365
 366         mutex_lock(&local->iflist_mtx);
 367         ieee80211_recalc_smps(local);
 368         mutex_unlock(&local->iflist_mtx);
 369 }
 370
 371 #ifdef CONFIG_INET
 372 static int ieee80211_ifa_changed(struct notifier_block *nb,
 373                                  unsigned long data, void *arg)
 374 {
 375         struct in_ifaddr *ifa = arg;
 376         struct ieee80211_local *local =
 377                 container_of(nb, struct ieee80211_local,
 378                              ifa_notifier);
 379         struct net_device *ndev = ifa->ifa_dev->dev;
 380         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 381         struct in_device *idev;
 382         struct ieee80211_sub_if_data *sdata;
 383         struct ieee80211_bss_conf *bss_conf;
 384         struct ieee80211_if_managed *ifmgd;
 385         int c = 0;
 386
 387         /* Make sure it's our interface that got changed */
 388         if (!wdev)
 389                 return NOTIFY_DONE;
 390
 391         if (wdev->wiphy != local->hw.wiphy)
 392                 return NOTIFY_DONE;
 393
 394         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 395         bss_conf = &sdata->vif.bss_conf;
 396
 397         /* ARP filtering is only supported in managed mode */
 398         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 399                 return NOTIFY_DONE;
 400
 401         idev = __in_dev_get_rtnl(sdata->dev);
 402         if (!idev)
 403                 return NOTIFY_DONE;
 404
 405         ifmgd = &sdata->u.mgd;
 406         mutex_lock(&ifmgd->mtx);
 407
 408         /* Copy the addresses to the bss_conf list */
 409         ifa = idev->ifa_list;
 410         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 411                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 412                 ifa = ifa->ifa_next;
 413                 c++;
 414         }
 415
 416         /* If not all addresses fit the list, disable filtering */
 417         if (ifa) {
 418                 sdata->arp_filter_state = false;
 419                 c = 0;
 420         } else {
 421                 sdata->arp_filter_state = true;
 422         }
 423         bss_conf->arp_addr_cnt = c;
 424
 425         /* Configure driver only if associated (which also implies it is up) */
 426         if (ifmgd->associated) {
 427                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 428                 ieee80211_bss_info_change_notify(sdata,
 429                                                  BSS_CHANGED_ARP_FILTER);
 430         }
 431
 432         mutex_unlock(&ifmgd->mtx);
 433
 434         return NOTIFY_DONE;
 435 }
 436 #endif
 437
 438 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 439 {
 440         struct ieee80211_local *local =
 441                 container_of(napi, struct ieee80211_local, napi);
 442
 443         return local->ops->napi_poll(&local->hw, budget);
 444 }
 445
 446 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 447 {
 448         struct ieee80211_local *local = hw_to_local(hw);
 449
 450         napi_schedule(&local->napi);
 451 }
 452 EXPORT_SYMBOL(ieee80211_napi_schedule);
 453
 454 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 455 {
 456         struct ieee80211_local *local = hw_to_local(hw);
 457
 458         napi_complete(&local->napi);
 459 }
 460 EXPORT_SYMBOL(ieee80211_napi_complete);
 461
 462 /* There isn't a lot of sense in it, but you can transmit anything you like */
 463 static const struct ieee80211_txrx_stypes
 464 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 465         [NL80211_IFTYPE_ADHOC] = {
 466                 .tx = 0xffff,
 467                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 468         },
 469         [NL80211_IFTYPE_STATION] = {
 470                 .tx = 0xffff,
 471                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 472                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 473         },
 474         [NL80211_IFTYPE_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_AP_VLAN] = {
 485                 /* copy AP */
 486                 .tx = 0xffff,
 487                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 488                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 489                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 490                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 491                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 492                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 493                         BIT(IEEE80211_STYPE_ACTION >> 4),
 494         },
 495         [NL80211_IFTYPE_P2P_CLIENT] = {
 496                 .tx = 0xffff,
 497                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 498                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 499         },
 500         [NL80211_IFTYPE_P2P_GO] = {
 501                 .tx = 0xffff,
 502                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 503                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 504                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 505                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 506                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 507                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 508                         BIT(IEEE80211_STYPE_ACTION >> 4),
 509         },
 510         [NL80211_IFTYPE_MESH_POINT] = {
 511                 .tx = 0xffff,
 512                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 513                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 514                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 515         },
 516 };
 517
 518 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 519         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 520                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 521
 522         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 523                                 IEEE80211_HT_CAP_MAX_AMSDU |
 524                                 IEEE80211_HT_CAP_SGI_40),
 525         .mcs = {
 526                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 527                              0xff, 0xff, 0xff, 0xff, 0xff, },
 528         },
 529 };
 530
 531 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 532                                         const struct ieee80211_ops *ops)
 533 {
 534         struct ieee80211_local *local;
 535         int priv_size, i;
 536         struct wiphy *wiphy;
 537
 538         /* Ensure 32-byte alignment of our private data and hw private data.
 539          * We use the wiphy priv data for both our ieee80211_local and for
 540          * the driver's private data
 541          *
 542          * In memory it'll be like this:
 543          *
 544          * +-------------------------+
 545          * | struct wiphy           |
 546          * +-------------------------+
 547          * | struct ieee80211_local  |
 548          * +-------------------------+
 549          * | driver's private data   |
 550          * +-------------------------+
 551          *
 552          */
 553         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 554
 555         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 556
 557         if (!wiphy)
 558                 return NULL;
 559
 560         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 561
 562         wiphy->privid = mac80211_wiphy_privid;
 563
 564         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 565                         WIPHY_FLAG_4ADDR_AP |
 566                         WIPHY_FLAG_4ADDR_STATION |
 567                         WIPHY_FLAG_REPORTS_OBSS |
 568                         WIPHY_FLAG_OFFCHAN_TX |
 569                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 570
 571         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 572                           NL80211_FEATURE_HT_IBSS;
 573
 574         if (!ops->set_key)
 575                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 576
 577         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 578
 579         local = wiphy_priv(wiphy);
 580
 581         local->hw.wiphy = wiphy;
 582
 583         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 584
 585         BUG_ON(!ops->tx && !ops->tx_frags);
 586         BUG_ON(!ops->start);
 587         BUG_ON(!ops->stop);
 588         BUG_ON(!ops->config);
 589         BUG_ON(!ops->add_interface);
 590         BUG_ON(!ops->remove_interface);
 591         BUG_ON(!ops->configure_filter);
 592         local->ops = ops;
 593
 594         /* set up some defaults */
 595         local->hw.queues = 1;
 596         local->hw.max_rates = 1;
 597         local->hw.max_report_rates = 0;
 598         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 599         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 600         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 601         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 602         local->user_power_level = -1;
 603         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 604         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 605         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 606
 607         INIT_LIST_HEAD(&local->interfaces);
 608
 609         __hw_addr_init(&local->mc_list);
 610
 611         mutex_init(&local->iflist_mtx);
 612         mutex_init(&local->mtx);
 613
 614         mutex_init(&local->key_mtx);
 615         spin_lock_init(&local->filter_lock);
 616         spin_lock_init(&local->queue_stop_reason_lock);
 617
 618         /*
 619          * The rx_skb_queue is only accessed from tasklets,
 620          * but other SKB queues are used from within IRQ
 621          * context. Therefore, this one needs a different
 622          * locking class so our direct, non-irq-safe use of
 623          * the queue's lock doesn't throw lockdep warnings.
 624          */
 625         skb_queue_head_init_class(&local->rx_skb_queue,
 626                                   &ieee80211_rx_skb_queue_class);
 627
 628         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 629
 630         ieee80211_work_init(local);
 631
 632         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 633
 634         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 635         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 636         local->smps_mode = IEEE80211_SMPS_OFF;
 637
 638         INIT_WORK(&local->dynamic_ps_enable_work,
 639                   ieee80211_dynamic_ps_enable_work);
 640         INIT_WORK(&local->dynamic_ps_disable_work,
 641                   ieee80211_dynamic_ps_disable_work);
 642         setup_timer(&local->dynamic_ps_timer,
 643                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 644
 645         INIT_WORK(&local->sched_scan_stopped_work,
 646                   ieee80211_sched_scan_stopped_work);
 647
 648         spin_lock_init(&local->ack_status_lock);
 649         idr_init(&local->ack_status_frames);
 650         /* preallocate at least one entry */
 651         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 652
 653         sta_info_init(local);
 654
 655         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 656                 skb_queue_head_init(&local->pending[i]);
 657                 atomic_set(&local->agg_queue_stop[i], 0);
 658         }
 659         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 660                      (unsigned long)local);
 661
 662         tasklet_init(&local->tasklet,
 663                      ieee80211_tasklet_handler,
 664                      (unsigned long) local);
 665
 666         skb_queue_head_init(&local->skb_queue);
 667         skb_queue_head_init(&local->skb_queue_unreliable);
 668
 669         /* init dummy netdev for use w/ NAPI */
 670         init_dummy_netdev(&local->napi_dev);
 671
 672         ieee80211_led_names(local);
 673
 674         ieee80211_hw_roc_setup(local);
 675
 676         return local_to_hw(local);
 677 }
 678 EXPORT_SYMBOL(ieee80211_alloc_hw);
 679
 680 int ieee80211_register_hw(struct ieee80211_hw *hw)
 681 {
 682         struct ieee80211_local *local = hw_to_local(hw);
 683         int result, i;
 684         enum ieee80211_band band;
 685         int channels, max_bitrates;
 686         bool supp_ht;
 687         static const u32 cipher_suites[] = {
 688                 /* keep WEP first, it may be removed below */
 689                 WLAN_CIPHER_SUITE_WEP40,
 690                 WLAN_CIPHER_SUITE_WEP104,
 691                 WLAN_CIPHER_SUITE_TKIP,
 692                 WLAN_CIPHER_SUITE_CCMP,
 693
 694                 /* keep last -- depends on hw flags! */
 695                 WLAN_CIPHER_SUITE_AES_CMAC
 696         };
 697
 698         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 699 #ifdef CONFIG_PM
 700             && (!local->ops->suspend || !local->ops->resume)
 701 #endif
 702             )
 703                 return -EINVAL;
 704
 705         if (hw->max_report_rates == 0)
 706                 hw->max_report_rates = hw->max_rates;
 707
 708         /*
 709          * generic code guarantees at least one band,
 710          * set this very early because much code assumes
 711          * that hw.conf.channel is assigned
 712          */
 713         channels = 0;
 714         max_bitrates = 0;
 715         supp_ht = false;
 716         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 717                 struct ieee80211_supported_band *sband;
 718
 719                 sband = local->hw.wiphy->bands[band];
 720                 if (!sband)
 721                         continue;
 722                 if (!local->oper_channel) {
 723                         /* init channel we're on */
 724                         local->hw.conf.channel =
 725                         local->oper_channel = &sband->channels[0];
 726                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 727                 }
 728                 channels += sband->n_channels;
 729
 730                 if (max_bitrates < sband->n_bitrates)
 731                         max_bitrates = sband->n_bitrates;
 732                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 733         }
 734
 735         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 736                                       sizeof(void *) * channels, GFP_KERNEL);
 737         if (!local->int_scan_req)
 738                 return -ENOMEM;
 739
 740         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 741                 if (!local->hw.wiphy->bands[band])
 742                         continue;
 743                 local->int_scan_req->rates[band] = (u32) -1;
 744         }
 745
 746         /* if low-level driver supports AP, we also support VLAN */
 747         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 748                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 749                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 750         }
 751
 752         /* mac80211 always supports monitor */
 753         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 754         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 755
 756         /*
 757          * mac80211 doesn't support more than 1 channel, and also not more
 758          * than one IBSS interface
 759          */
 760         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 761                 const struct ieee80211_iface_combination *c;
 762                 int j;
 763
 764                 c = &hw->wiphy->iface_combinations[i];
 765
 766                 if (c->num_different_channels > 1)
 767                         return -EINVAL;
 768
 769                 for (j = 0; j < c->n_limits; j++)
 770                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 771                             c->limits[j].max > 1)
 772                                 return -EINVAL;
 773         }
 774
 775 #ifndef CONFIG_MAC80211_MESH
 776         /* mesh depends on Kconfig, but drivers should set it if they want */
 777         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 778 #endif
 779
 780         /* if the underlying driver supports mesh, mac80211 will (at least)
 781          * provide routing of mesh authentication frames to userspace */
 782         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 783                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 784
 785         /* mac80211 supports control port protocol changing */
 786         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 787
 788         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 789                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 790         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 791                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 792
 793         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 794              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 795              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 796
 797         /*
 798          * Calculate scan IE length -- we need this to alloc
 799          * memory and to subtract from the driver limit. It
 800          * includes the DS Params, (extended) supported rates, and HT
 801          * information -- SSID is the driver's responsibility.
 802          */
 803         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 804                 3 /* DS Params */;
 805         if (supp_ht)
 806                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 807
 808         if (!local->ops->hw_scan) {
 809                 /* For hw_scan, driver needs to set these up. */
 810                 local->hw.wiphy->max_scan_ssids = 4;
 811                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 812         }
 813
 814         /*
 815          * If the driver supports any scan IEs, then assume the
 816          * limit includes the IEs mac80211 will add, otherwise
 817          * leave it at zero and let the driver sort it out; we
 818          * still pass our IEs to the driver but userspace will
 819          * not be allowed to in that case.
 820          */
 821         if (local->hw.wiphy->max_scan_ie_len)
 822                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 823
 824         /* Set up cipher suites unless driver already did */
 825         if (!local->hw.wiphy->cipher_suites) {
 826                 local->hw.wiphy->cipher_suites = cipher_suites;
 827                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 828                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 829                         local->hw.wiphy->n_cipher_suites--;
 830         }
 831         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 832                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 833                         local->hw.wiphy->cipher_suites += 2;
 834                         local->hw.wiphy->n_cipher_suites -= 2;
 835                 } else {
 836                         u32 *suites;
 837                         int r, w = 0;
 838
 839                         /* Filter out WEP */
 840
 841                         suites = kmemdup(
 842                                 local->hw.wiphy->cipher_suites,
 843                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 844                                 GFP_KERNEL);
 845                         if (!suites)
 846                                 return -ENOMEM;
 847                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 848                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 849                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 850                                     suite == WLAN_CIPHER_SUITE_WEP104)
 851                                         continue;
 852                                 suites[w++] = suite;
 853                         }
 854                         local->hw.wiphy->cipher_suites = suites;
 855                         local->hw.wiphy->n_cipher_suites = w;
 856                         local->wiphy_ciphers_allocated = true;
 857                 }
 858         }
 859
 860         if (!local->ops->remain_on_channel)
 861                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 862
 863         if (local->ops->sched_scan_start)
 864                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 865
 866         /* mac80211 based drivers don't support internal TDLS setup */
 867         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 868                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 869
 870         result = wiphy_register(local->hw.wiphy);
 871         if (result < 0)
 872                 goto fail_wiphy_register;
 873
 874         /*
 875          * We use the number of queues for feature tests (QoS, HT) internally
 876          * so restrict them appropriately.
 877          */
 878         if (hw->queues > IEEE80211_MAX_QUEUES)
 879                 hw->queues = IEEE80211_MAX_QUEUES;
 880
 881         local->workqueue =
 882                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 883         if (!local->workqueue) {
 884                 result = -ENOMEM;
 885                 goto fail_workqueue;
 886         }
 887
 888         /*
 889          * The hardware needs headroom for sending the frame,
 890          * and we need some headroom for passing the frame to monitor
 891          * interfaces, but never both at the same time.
 892          */
 893         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 894                                    IEEE80211_TX_STATUS_HEADROOM);
 895
 896         debugfs_hw_add(local);
 897
 898         /*
 899          * if the driver doesn't specify a max listen interval we
 900          * use 5 which should be a safe default
 901          */
 902         if (local->hw.max_listen_interval == 0)
 903                 local->hw.max_listen_interval = 5;
 904
 905         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 906
 907         local->dynamic_ps_forced_timeout = -1;
 908
 909         result = ieee80211_wep_init(local);
 910         if (result < 0)
 911                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 912                             result);
 913
 914         rtnl_lock();
 915
 916         result = ieee80211_init_rate_ctrl_alg(local,
 917                                               hw->rate_control_algorithm);
 918         if (result < 0) {
 919                 wiphy_debug(local->hw.wiphy,
 920                             "Failed to initialize rate control algorithm\n");
 921                 goto fail_rate;
 922         }
 923
 924         /* add one default STA interface if supported */
 925         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 926                 result = ieee80211_if_add(local, "wlan%d", NULL,
 927                                           NL80211_IFTYPE_STATION, NULL);
 928                 if (result)
 929                         wiphy_warn(local->hw.wiphy,
 930                                    "Failed to add default virtual iface\n");
 931         }
 932
 933         rtnl_unlock();
 934
 935         ieee80211_led_init(local);
 936
 937         local->network_latency_notifier.notifier_call =
 938                 ieee80211_max_network_latency;
 939         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 940                                      &local->network_latency_notifier);
 941         if (result) {
 942                 rtnl_lock();
 943                 goto fail_pm_qos;
 944         }
 945
 946 #ifdef CONFIG_INET
 947         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 948         result = register_inetaddr_notifier(&local->ifa_notifier);
 949         if (result)
 950                 goto fail_ifa;
 951 #endif
 952
 953         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 954                         local->hw.napi_weight);
 955
 956         return 0;
 957
 958 #ifdef CONFIG_INET
 959  fail_ifa:
 960         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 961                                &local->network_latency_notifier);
 962         rtnl_lock();
 963 #endif
 964  fail_pm_qos:
 965         ieee80211_led_exit(local);
 966         ieee80211_remove_interfaces(local);
 967  fail_rate:
 968         rtnl_unlock();
 969         ieee80211_wep_free(local);
 970         sta_info_stop(local);
 971         destroy_workqueue(local->workqueue);
 972  fail_workqueue:
 973         wiphy_unregister(local->hw.wiphy);
 974  fail_wiphy_register:
 975         if (local->wiphy_ciphers_allocated)
 976                 kfree(local->hw.wiphy->cipher_suites);
 977         kfree(local->int_scan_req);
 978         return result;
 979 }
 980 EXPORT_SYMBOL(ieee80211_register_hw);
 981
 982 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 983 {
 984         struct ieee80211_local *local = hw_to_local(hw);
 985
 986         tasklet_kill(&local->tx_pending_tasklet);
 987         tasklet_kill(&local->tasklet);
 988
 989         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 990                                &local->network_latency_notifier);
 991 #ifdef CONFIG_INET
 992         unregister_inetaddr_notifier(&local->ifa_notifier);
 993 #endif
 994
 995         rtnl_lock();
 996
 997         /*
 998          * At this point, interface list manipulations are fine
 999          * because the driver cannot be handing us frames any
1000          * more and the tasklet is killed.
1001          */
1002         ieee80211_remove_interfaces(local);
1003
1004         rtnl_unlock();
1005
1006         /*
1007          * Now all work items will be gone, but the
1008          * timer might still be armed, so delete it
1009          */
1010         del_timer_sync(&local->work_timer);
1011
1012         cancel_work_sync(&local->restart_work);
1013         cancel_work_sync(&local->reconfig_filter);
1014
1015         ieee80211_clear_tx_pending(local);
1016         rate_control_deinitialize(local);
1017
1018         if (skb_queue_len(&local->skb_queue) ||
1019             skb_queue_len(&local->skb_queue_unreliable))
1020                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1021         skb_queue_purge(&local->skb_queue);
1022         skb_queue_purge(&local->skb_queue_unreliable);
1023         skb_queue_purge(&local->rx_skb_queue);
1024
1025         destroy_workqueue(local->workqueue);
1026         wiphy_unregister(local->hw.wiphy);
1027         sta_info_stop(local);
1028         ieee80211_wep_free(local);
1029         ieee80211_led_exit(local);
1030         kfree(local->int_scan_req);
1031 }
1032 EXPORT_SYMBOL(ieee80211_unregister_hw);
1033
1034 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1035 {
1036         WARN_ONCE(1, "Have pending ack frames!\n");
1037         kfree_skb(p);
1038         return 0;
1039 }
1040
1041 void ieee80211_free_hw(struct ieee80211_hw *hw)
1042 {
1043         struct ieee80211_local *local = hw_to_local(hw);
1044
1045         mutex_destroy(&local->iflist_mtx);
1046         mutex_destroy(&local->mtx);
1047
1048         if (local->wiphy_ciphers_allocated)
1049                 kfree(local->hw.wiphy->cipher_suites);
1050
1051         idr_for_each(&local->ack_status_frames,
1052                      ieee80211_free_ack_frame, NULL);
1053         idr_destroy(&local->ack_status_frames);
1054
1055         wiphy_free(local->hw.wiphy);
1056 }
1057 EXPORT_SYMBOL(ieee80211_free_hw);
1058
1059 static int __init ieee80211_init(void)
1060 {
1061         struct sk_buff *skb;
1062         int ret;
1063
1064         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1065         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1066                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1067
1068         ret = rc80211_minstrel_init();
1069         if (ret)
1070                 return ret;
1071
1072         ret = rc80211_minstrel_ht_init();
1073         if (ret)
1074                 goto err_minstrel;
1075
1076         ret = rc80211_pid_init();
1077         if (ret)
1078                 goto err_pid;
1079
1080         ret = ieee80211_iface_init();
1081         if (ret)
1082                 goto err_netdev;
1083
1084         return 0;
1085  err_netdev:
1086         rc80211_pid_exit();
1087  err_pid:
1088         rc80211_minstrel_ht_exit();
1089  err_minstrel:
1090         rc80211_minstrel_exit();
1091
1092         return ret;
1093 }
1094
1095 static void __exit ieee80211_exit(void)
1096 {
1097         rc80211_pid_exit();
1098         rc80211_minstrel_ht_exit();
1099         rc80211_minstrel_exit();
1100
1101         if (mesh_allocated)
1102                 ieee80211s_stop();
1103
1104         ieee80211_iface_exit();
1105
1106         rcu_barrier();
1107 }
1108
1109
1110 subsys_initcall(ieee80211_init);
1111 module_exit(ieee80211_exit);
1112
1113 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1114 MODULE_LICENSE("GPL");