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             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  52                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  53
  54         if (local->fif_probe_req || local->probe_req_reg)
  55                 new_flags |= FIF_PROBE_REQ;
  56
  57         if (local->fif_fcsfail)
  58                 new_flags |= FIF_FCSFAIL;
  59
  60         if (local->fif_plcpfail)
  61                 new_flags |= FIF_PLCPFAIL;
  62
  63         if (local->fif_control)
  64                 new_flags |= FIF_CONTROL;
  65
  66         if (local->fif_other_bss)
  67                 new_flags |= FIF_OTHER_BSS;
  68
  69         if (local->fif_pspoll)
  70                 new_flags |= FIF_PSPOLL;
  71
  72         spin_lock_bh(&local->filter_lock);
  73         changed_flags = local->filter_flags ^ new_flags;
  74
  75         mc = drv_prepare_multicast(local, &local->mc_list);
  76         spin_unlock_bh(&local->filter_lock);
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         drv_configure_filter(local, changed_flags, &new_flags, mc);
  82
  83         WARN_ON(new_flags & (1<<31));
  84
  85         local->filter_flags = new_flags & ~(1<<31);
  86 }
  87
  88 static void ieee80211_reconfig_filter(struct work_struct *work)
  89 {
  90         struct ieee80211_local *local =
  91                 container_of(work, struct ieee80211_local, reconfig_filter);
  92
  93         ieee80211_configure_filter(local);
  94 }
  95
  96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  97 {
  98         struct ieee80211_channel *chan;
  99         int ret = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102         u32 offchannel_flag;
 103
 104         might_sleep();
 105
 106         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 107         if (local->scan_channel) {
 108                 chan = local->scan_channel;
 109                 /* If scanning on oper channel, use whatever channel-type
 110                  * is currently in use.
 111                  */
 112                 if (chan == local->oper_channel)
 113                         channel_type = local->_oper_channel_type;
 114                 else
 115                         channel_type = NL80211_CHAN_NO_HT;
 116         } else if (local->tmp_channel) {
 117                 chan = local->tmp_channel;
 118                 channel_type = local->tmp_channel_type;
 119         } else {
 120                 chan = local->oper_channel;
 121                 channel_type = local->_oper_channel_type;
 122         }
 123
 124         if (chan != local->oper_channel ||
 125             channel_type != local->_oper_channel_type)
 126                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 127         else
 128                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 129
 130         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 131
 132         if (offchannel_flag || chan != local->hw.conf.channel ||
 133             channel_type != local->hw.conf.channel_type) {
 134                 local->hw.conf.channel = chan;
 135                 local->hw.conf.channel_type = channel_type;
 136                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 137         }
 138
 139         if (!conf_is_ht(&local->hw.conf)) {
 140                 /*
 141                  * mac80211.h documents that this is only valid
 142                  * when the channel is set to an HT type, and
 143                  * that otherwise STATIC is used.
 144                  */
 145                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 146         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 147                 local->hw.conf.smps_mode = local->smps_mode;
 148                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 149         }
 150
 151         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 152             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 153             test_bit(SCAN_HW_SCANNING, &local->scanning))
 154                 power = chan->max_power;
 155         else
 156                 power = local->power_constr_level ?
 157                         min(chan->max_power,
 158                                 (chan->max_reg_power  - local->power_constr_level)) :
 159                         chan->max_power;
 160
 161         if (local->user_power_level >= 0)
 162                 power = min(power, local->user_power_level);
 163
 164         if (local->hw.conf.power_level != power) {
 165                 changed |= IEEE80211_CONF_CHANGE_POWER;
 166                 local->hw.conf.power_level = power;
 167         }
 168
 169         if (changed && local->open_count) {
 170                 ret = drv_config(local, changed);
 171                 /*
 172                  * Goal:
 173                  * HW reconfiguration should never fail, the driver has told
 174                  * us what it can support so it should live up to that promise.
 175                  *
 176                  * Current status:
 177                  * rfkill is not integrated with mac80211 and a
 178                  * configuration command can thus fail if hardware rfkill
 179                  * is enabled
 180                  *
 181                  * FIXME: integrate rfkill with mac80211 and then add this
 182                  * WARN_ON() back
 183                  *
 184                  */
 185                 /* WARN_ON(ret); */
 186         }
 187
 188         return ret;
 189 }
 190
 191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 192                                       u32 changed)
 193 {
 194         struct ieee80211_local *local = sdata->local;
 195         static const u8 zero[ETH_ALEN] = { 0 };
 196
 197         if (!changed)
 198                 return;
 199
 200         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 201                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 202         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 203                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 204         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 205                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 206         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 207                 sdata->vif.bss_conf.bssid = NULL;
 208         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 209                 sdata->vif.bss_conf.bssid = zero;
 210         } else {
 211                 WARN_ON(1);
 212                 return;
 213         }
 214
 215         switch (sdata->vif.type) {
 216         case NL80211_IFTYPE_AP:
 217         case NL80211_IFTYPE_ADHOC:
 218         case NL80211_IFTYPE_WDS:
 219         case NL80211_IFTYPE_MESH_POINT:
 220                 break;
 221         default:
 222                 /* do not warn to simplify caller in scan.c */
 223                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 224                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 225                         return;
 226                 break;
 227         }
 228
 229         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 230                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 231                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 232                         sdata->vif.bss_conf.enable_beacon = false;
 233                 } else {
 234                         /*
 235                          * Beacon should be enabled, but AP mode must
 236                          * check whether there is a beacon configured.
 237                          */
 238                         switch (sdata->vif.type) {
 239                         case NL80211_IFTYPE_AP:
 240                                 sdata->vif.bss_conf.enable_beacon =
 241                                         !!sdata->u.ap.beacon;
 242                                 break;
 243                         case NL80211_IFTYPE_ADHOC:
 244                                 sdata->vif.bss_conf.enable_beacon =
 245                                         !!sdata->u.ibss.presp;
 246                                 break;
 247 #ifdef CONFIG_MAC80211_MESH
 248                         case NL80211_IFTYPE_MESH_POINT:
 249                                 sdata->vif.bss_conf.enable_beacon =
 250                                         !!sdata->u.mesh.mesh_id_len;
 251                                 break;
 252 #endif
 253                         default:
 254                                 /* not reached */
 255                                 WARN_ON(1);
 256                                 break;
 257                         }
 258                 }
 259         }
 260
 261         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 262 }
 263
 264 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 265 {
 266         sdata->vif.bss_conf.use_cts_prot = false;
 267         sdata->vif.bss_conf.use_short_preamble = false;
 268         sdata->vif.bss_conf.use_short_slot = false;
 269         return BSS_CHANGED_ERP_CTS_PROT |
 270                BSS_CHANGED_ERP_PREAMBLE |
 271                BSS_CHANGED_ERP_SLOT;
 272 }
 273
 274 static void ieee80211_tasklet_handler(unsigned long data)
 275 {
 276         struct ieee80211_local *local = (struct ieee80211_local *) data;
 277         struct sta_info *sta, *tmp;
 278         struct skb_eosp_msg_data *eosp_data;
 279         struct sk_buff *skb;
 280
 281         while ((skb = skb_dequeue(&local->skb_queue)) ||
 282                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 283                 switch (skb->pkt_type) {
 284                 case IEEE80211_RX_MSG:
 285                         /* Clear skb->pkt_type in order to not confuse kernel
 286                          * netstack. */
 287                         skb->pkt_type = 0;
 288                         ieee80211_rx(&local->hw, skb);
 289                         break;
 290                 case IEEE80211_TX_STATUS_MSG:
 291                         skb->pkt_type = 0;
 292                         ieee80211_tx_status(&local->hw, skb);
 293                         break;
 294                 case IEEE80211_EOSP_MSG:
 295                         eosp_data = (void *)skb->cb;
 296                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 297                                 /* skip wrong virtual interface */
 298                                 if (memcmp(eosp_data->iface,
 299                                            sta->sdata->vif.addr, ETH_ALEN))
 300                                         continue;
 301                                 clear_sta_flag(sta, WLAN_STA_SP);
 302                                 break;
 303                         }
 304                         dev_kfree_skb(skb);
 305                         break;
 306                 default:
 307                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 308                              skb->pkt_type);
 309                         dev_kfree_skb(skb);
 310                         break;
 311                 }
 312         }
 313 }
 314
 315 static void ieee80211_restart_work(struct work_struct *work)
 316 {
 317         struct ieee80211_local *local =
 318                 container_of(work, struct ieee80211_local, restart_work);
 319
 320         /* wait for scan work complete */
 321         flush_workqueue(local->workqueue);
 322
 323         mutex_lock(&local->mtx);
 324         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 325              local->sched_scanning,
 326                 "%s called with hardware scan in progress\n", __func__);
 327         mutex_unlock(&local->mtx);
 328
 329         rtnl_lock();
 330         ieee80211_scan_cancel(local);
 331         ieee80211_reconfig(local);
 332         rtnl_unlock();
 333 }
 334
 335 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 336 {
 337         struct ieee80211_local *local = hw_to_local(hw);
 338
 339         trace_api_restart_hw(local);
 340
 341         wiphy_info(hw->wiphy,
 342                    "Hardware restart was requested\n");
 343
 344         /* use this reason, ieee80211_reconfig will unblock it */
 345         ieee80211_stop_queues_by_reason(hw,
 346                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 347
 348         /*
 349          * Stop all Rx during the reconfig. We don't want state changes
 350          * or driver callbacks while this is in progress.
 351          */
 352         local->in_reconfig = true;
 353         barrier();
 354
 355         schedule_work(&local->restart_work);
 356 }
 357 EXPORT_SYMBOL(ieee80211_restart_hw);
 358
 359 static void ieee80211_recalc_smps_work(struct work_struct *work)
 360 {
 361         struct ieee80211_local *local =
 362                 container_of(work, struct ieee80211_local, recalc_smps);
 363
 364         mutex_lock(&local->iflist_mtx);
 365         ieee80211_recalc_smps(local);
 366         mutex_unlock(&local->iflist_mtx);
 367 }
 368
 369 #ifdef CONFIG_INET
 370 static int ieee80211_ifa_changed(struct notifier_block *nb,
 371                                  unsigned long data, void *arg)
 372 {
 373         struct in_ifaddr *ifa = arg;
 374         struct ieee80211_local *local =
 375                 container_of(nb, struct ieee80211_local,
 376                              ifa_notifier);
 377         struct net_device *ndev = ifa->ifa_dev->dev;
 378         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 379         struct in_device *idev;
 380         struct ieee80211_sub_if_data *sdata;
 381         struct ieee80211_bss_conf *bss_conf;
 382         struct ieee80211_if_managed *ifmgd;
 383         int c = 0;
 384
 385         /* Make sure it's our interface that got changed */
 386         if (!wdev)
 387                 return NOTIFY_DONE;
 388
 389         if (wdev->wiphy != local->hw.wiphy)
 390                 return NOTIFY_DONE;
 391
 392         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 393         bss_conf = &sdata->vif.bss_conf;
 394
 395         /* ARP filtering is only supported in managed mode */
 396         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 397                 return NOTIFY_DONE;
 398
 399         idev = __in_dev_get_rtnl(sdata->dev);
 400         if (!idev)
 401                 return NOTIFY_DONE;
 402
 403         ifmgd = &sdata->u.mgd;
 404         mutex_lock(&ifmgd->mtx);
 405
 406         /* Copy the addresses to the bss_conf list */
 407         ifa = idev->ifa_list;
 408         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 409                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 410                 ifa = ifa->ifa_next;
 411                 c++;
 412         }
 413
 414         /* If not all addresses fit the list, disable filtering */
 415         if (ifa) {
 416                 sdata->arp_filter_state = false;
 417                 c = 0;
 418         } else {
 419                 sdata->arp_filter_state = true;
 420         }
 421         bss_conf->arp_addr_cnt = c;
 422
 423         /* Configure driver only if associated (which also implies it is up) */
 424         if (ifmgd->associated) {
 425                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 426                 ieee80211_bss_info_change_notify(sdata,
 427                                                  BSS_CHANGED_ARP_FILTER);
 428         }
 429
 430         mutex_unlock(&ifmgd->mtx);
 431
 432         return NOTIFY_DONE;
 433 }
 434 #endif
 435
 436 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 437 {
 438         struct ieee80211_local *local =
 439                 container_of(napi, struct ieee80211_local, napi);
 440
 441         return local->ops->napi_poll(&local->hw, budget);
 442 }
 443
 444 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 445 {
 446         struct ieee80211_local *local = hw_to_local(hw);
 447
 448         napi_schedule(&local->napi);
 449 }
 450 EXPORT_SYMBOL(ieee80211_napi_schedule);
 451
 452 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 453 {
 454         struct ieee80211_local *local = hw_to_local(hw);
 455
 456         napi_complete(&local->napi);
 457 }
 458 EXPORT_SYMBOL(ieee80211_napi_complete);
 459
 460 /* There isn't a lot of sense in it, but you can transmit anything you like */
 461 static const struct ieee80211_txrx_stypes
 462 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 463         [NL80211_IFTYPE_ADHOC] = {
 464                 .tx = 0xffff,
 465                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 466                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 467                         BIT(IEEE80211_STYPE_DEAUTH >> 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         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 539                 return NULL;
 540
 541         /* Ensure 32-byte alignment of our private data and hw private data.
 542          * We use the wiphy priv data for both our ieee80211_local and for
 543          * the driver's private data
 544          *
 545          * In memory it'll be like this:
 546          *
 547          * +-------------------------+
 548          * | struct wiphy           |
 549          * +-------------------------+
 550          * | struct ieee80211_local  |
 551          * +-------------------------+
 552          * | driver's private data   |
 553          * +-------------------------+
 554          *
 555          */
 556         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 557
 558         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 559
 560         if (!wiphy)
 561                 return NULL;
 562
 563         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 564
 565         wiphy->privid = mac80211_wiphy_privid;
 566
 567         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 568                         WIPHY_FLAG_4ADDR_AP |
 569                         WIPHY_FLAG_4ADDR_STATION |
 570                         WIPHY_FLAG_REPORTS_OBSS |
 571                         WIPHY_FLAG_OFFCHAN_TX;
 572
 573         if (ops->remain_on_channel)
 574                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 575
 576         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 577                           NL80211_FEATURE_HT_IBSS;
 578
 579         if (!ops->set_key)
 580                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 581
 582         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 583
 584         local = wiphy_priv(wiphy);
 585
 586         local->hw.wiphy = wiphy;
 587
 588         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 589
 590         BUG_ON(!ops->tx);
 591         BUG_ON(!ops->start);
 592         BUG_ON(!ops->stop);
 593         BUG_ON(!ops->config);
 594         BUG_ON(!ops->add_interface);
 595         BUG_ON(!ops->remove_interface);
 596         BUG_ON(!ops->configure_filter);
 597         local->ops = ops;
 598
 599         /* set up some defaults */
 600         local->hw.queues = 1;
 601         local->hw.max_rates = 1;
 602         local->hw.max_report_rates = 0;
 603         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 604         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 605         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 606         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 607         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 608         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 609                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 610                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 611         local->user_power_level = -1;
 612         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 613
 614         INIT_LIST_HEAD(&local->interfaces);
 615
 616         __hw_addr_init(&local->mc_list);
 617
 618         mutex_init(&local->iflist_mtx);
 619         mutex_init(&local->mtx);
 620
 621         mutex_init(&local->key_mtx);
 622         spin_lock_init(&local->filter_lock);
 623         spin_lock_init(&local->queue_stop_reason_lock);
 624
 625         /*
 626          * The rx_skb_queue is only accessed from tasklets,
 627          * but other SKB queues are used from within IRQ
 628          * context. Therefore, this one needs a different
 629          * locking class so our direct, non-irq-safe use of
 630          * the queue's lock doesn't throw lockdep warnings.
 631          */
 632         skb_queue_head_init_class(&local->rx_skb_queue,
 633                                   &ieee80211_rx_skb_queue_class);
 634
 635         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 636
 637         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 638
 639         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 640         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 641         local->smps_mode = IEEE80211_SMPS_OFF;
 642
 643         INIT_WORK(&local->dynamic_ps_enable_work,
 644                   ieee80211_dynamic_ps_enable_work);
 645         INIT_WORK(&local->dynamic_ps_disable_work,
 646                   ieee80211_dynamic_ps_disable_work);
 647         setup_timer(&local->dynamic_ps_timer,
 648                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 649
 650         INIT_WORK(&local->sched_scan_stopped_work,
 651                   ieee80211_sched_scan_stopped_work);
 652
 653         spin_lock_init(&local->ack_status_lock);
 654         idr_init(&local->ack_status_frames);
 655         /* preallocate at least one entry */
 656         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 657
 658         sta_info_init(local);
 659
 660         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 661                 skb_queue_head_init(&local->pending[i]);
 662                 atomic_set(&local->agg_queue_stop[i], 0);
 663         }
 664         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 665                      (unsigned long)local);
 666
 667         tasklet_init(&local->tasklet,
 668                      ieee80211_tasklet_handler,
 669                      (unsigned long) local);
 670
 671         skb_queue_head_init(&local->skb_queue);
 672         skb_queue_head_init(&local->skb_queue_unreliable);
 673
 674         /* init dummy netdev for use w/ NAPI */
 675         init_dummy_netdev(&local->napi_dev);
 676
 677         ieee80211_led_names(local);
 678
 679         ieee80211_roc_setup(local);
 680
 681         return &local->hw;
 682 }
 683 EXPORT_SYMBOL(ieee80211_alloc_hw);
 684
 685 int ieee80211_register_hw(struct ieee80211_hw *hw)
 686 {
 687         struct ieee80211_local *local = hw_to_local(hw);
 688         int result, i;
 689         enum ieee80211_band band;
 690         int channels, max_bitrates;
 691         bool supp_ht, supp_vht;
 692         netdev_features_t feature_whitelist;
 693         static const u32 cipher_suites[] = {
 694                 /* keep WEP first, it may be removed below */
 695                 WLAN_CIPHER_SUITE_WEP40,
 696                 WLAN_CIPHER_SUITE_WEP104,
 697                 WLAN_CIPHER_SUITE_TKIP,
 698                 WLAN_CIPHER_SUITE_CCMP,
 699
 700                 /* keep last -- depends on hw flags! */
 701                 WLAN_CIPHER_SUITE_AES_CMAC
 702         };
 703
 704         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 705             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 706              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 707                 return -EINVAL;
 708
 709 #ifdef CONFIG_PM
 710         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 711             (!local->ops->suspend || !local->ops->resume))
 712                 return -EINVAL;
 713 #endif
 714
 715         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 716                 return -EINVAL;
 717
 718         /* Only HW csum features are currently compatible with mac80211 */
 719         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 720                             NETIF_F_HW_CSUM;
 721         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 722                 return -EINVAL;
 723
 724         if (hw->max_report_rates == 0)
 725                 hw->max_report_rates = hw->max_rates;
 726
 727         /*
 728          * generic code guarantees at least one band,
 729          * set this very early because much code assumes
 730          * that hw.conf.channel is assigned
 731          */
 732         channels = 0;
 733         max_bitrates = 0;
 734         supp_ht = false;
 735         supp_vht = false;
 736         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 737                 struct ieee80211_supported_band *sband;
 738
 739                 sband = local->hw.wiphy->bands[band];
 740                 if (!sband)
 741                         continue;
 742                 if (!local->oper_channel) {
 743                         /* init channel we're on */
 744                         local->hw.conf.channel =
 745                         local->oper_channel = &sband->channels[0];
 746                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 747                 }
 748                 channels += sband->n_channels;
 749
 750                 if (max_bitrates < sband->n_bitrates)
 751                         max_bitrates = sband->n_bitrates;
 752                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 753                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 754         }
 755
 756         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 757                                       sizeof(void *) * channels, GFP_KERNEL);
 758         if (!local->int_scan_req)
 759                 return -ENOMEM;
 760
 761         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 762                 if (!local->hw.wiphy->bands[band])
 763                         continue;
 764                 local->int_scan_req->rates[band] = (u32) -1;
 765         }
 766
 767         /* if low-level driver supports AP, we also support VLAN */
 768         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 769                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 770                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 771         }
 772
 773         /* mac80211 always supports monitor */
 774         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 775         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 776
 777         /*
 778          * mac80211 doesn't support more than 1 channel, and also not more
 779          * than one IBSS interface
 780          */
 781         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 782                 const struct ieee80211_iface_combination *c;
 783                 int j;
 784
 785                 c = &hw->wiphy->iface_combinations[i];
 786
 787                 if (c->num_different_channels > 1)
 788                         return -EINVAL;
 789
 790                 for (j = 0; j < c->n_limits; j++)
 791                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 792                             c->limits[j].max > 1)
 793                                 return -EINVAL;
 794         }
 795
 796 #ifndef CONFIG_MAC80211_MESH
 797         /* mesh depends on Kconfig, but drivers should set it if they want */
 798         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 799 #endif
 800
 801         /* if the underlying driver supports mesh, mac80211 will (at least)
 802          * provide routing of mesh authentication frames to userspace */
 803         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 804                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 805
 806         /* mac80211 supports control port protocol changing */
 807         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 808
 809         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 810                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 811         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 812                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 813
 814         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 815              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 816              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 817
 818         /*
 819          * Calculate scan IE length -- we need this to alloc
 820          * memory and to subtract from the driver limit. It
 821          * includes the DS Params, (extended) supported rates, and HT
 822          * information -- SSID is the driver's responsibility.
 823          */
 824         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 825                 3 /* DS Params */;
 826         if (supp_ht)
 827                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 828
 829         if (supp_vht)
 830                 local->scan_ies_len +=
 831                         2 + sizeof(struct ieee80211_vht_capabilities);
 832
 833         if (!local->ops->hw_scan) {
 834                 /* For hw_scan, driver needs to set these up. */
 835                 local->hw.wiphy->max_scan_ssids = 4;
 836                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 837         }
 838
 839         /*
 840          * If the driver supports any scan IEs, then assume the
 841          * limit includes the IEs mac80211 will add, otherwise
 842          * leave it at zero and let the driver sort it out; we
 843          * still pass our IEs to the driver but userspace will
 844          * not be allowed to in that case.
 845          */
 846         if (local->hw.wiphy->max_scan_ie_len)
 847                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 848
 849         /* Set up cipher suites unless driver already did */
 850         if (!local->hw.wiphy->cipher_suites) {
 851                 local->hw.wiphy->cipher_suites = cipher_suites;
 852                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 853                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 854                         local->hw.wiphy->n_cipher_suites--;
 855         }
 856         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 857                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 858                         local->hw.wiphy->cipher_suites += 2;
 859                         local->hw.wiphy->n_cipher_suites -= 2;
 860                 } else {
 861                         u32 *suites;
 862                         int r, w = 0;
 863
 864                         /* Filter out WEP */
 865
 866                         suites = kmemdup(
 867                                 local->hw.wiphy->cipher_suites,
 868                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 869                                 GFP_KERNEL);
 870                         if (!suites)
 871                                 return -ENOMEM;
 872                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 873                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 874                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 875                                     suite == WLAN_CIPHER_SUITE_WEP104)
 876                                         continue;
 877                                 suites[w++] = suite;
 878                         }
 879                         local->hw.wiphy->cipher_suites = suites;
 880                         local->hw.wiphy->n_cipher_suites = w;
 881                         local->wiphy_ciphers_allocated = true;
 882                 }
 883         }
 884
 885         if (!local->ops->remain_on_channel)
 886                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 887
 888         if (local->ops->sched_scan_start)
 889                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 890
 891         /* mac80211 based drivers don't support internal TDLS setup */
 892         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 893                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 894
 895         result = wiphy_register(local->hw.wiphy);
 896         if (result < 0)
 897                 goto fail_wiphy_register;
 898
 899         /*
 900          * We use the number of queues for feature tests (QoS, HT) internally
 901          * so restrict them appropriately.
 902          */
 903         if (hw->queues > IEEE80211_MAX_QUEUES)
 904                 hw->queues = IEEE80211_MAX_QUEUES;
 905
 906         local->workqueue =
 907                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 908         if (!local->workqueue) {
 909                 result = -ENOMEM;
 910                 goto fail_workqueue;
 911         }
 912
 913         /*
 914          * The hardware needs headroom for sending the frame,
 915          * and we need some headroom for passing the frame to monitor
 916          * interfaces, but never both at the same time.
 917          */
 918         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 919                                    IEEE80211_TX_STATUS_HEADROOM);
 920
 921         debugfs_hw_add(local);
 922
 923         /*
 924          * if the driver doesn't specify a max listen interval we
 925          * use 5 which should be a safe default
 926          */
 927         if (local->hw.max_listen_interval == 0)
 928                 local->hw.max_listen_interval = 5;
 929
 930         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 931
 932         local->dynamic_ps_forced_timeout = -1;
 933
 934         result = ieee80211_wep_init(local);
 935         if (result < 0)
 936                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 937                             result);
 938
 939         ieee80211_led_init(local);
 940
 941         rtnl_lock();
 942
 943         result = ieee80211_init_rate_ctrl_alg(local,
 944                                               hw->rate_control_algorithm);
 945         if (result < 0) {
 946                 wiphy_debug(local->hw.wiphy,
 947                             "Failed to initialize rate control algorithm\n");
 948                 goto fail_rate;
 949         }
 950
 951         /* add one default STA interface if supported */
 952         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 953                 result = ieee80211_if_add(local, "wlan%d", NULL,
 954                                           NL80211_IFTYPE_STATION, NULL);
 955                 if (result)
 956                         wiphy_warn(local->hw.wiphy,
 957                                    "Failed to add default virtual iface\n");
 958         }
 959
 960         rtnl_unlock();
 961
 962         local->network_latency_notifier.notifier_call =
 963                 ieee80211_max_network_latency;
 964         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 965                                      &local->network_latency_notifier);
 966         if (result) {
 967                 rtnl_lock();
 968                 goto fail_pm_qos;
 969         }
 970
 971 #ifdef CONFIG_INET
 972         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 973         result = register_inetaddr_notifier(&local->ifa_notifier);
 974         if (result)
 975                 goto fail_ifa;
 976 #endif
 977
 978         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 979                         local->hw.napi_weight);
 980
 981         return 0;
 982
 983 #ifdef CONFIG_INET
 984  fail_ifa:
 985         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 986                                &local->network_latency_notifier);
 987         rtnl_lock();
 988 #endif
 989  fail_pm_qos:
 990         ieee80211_led_exit(local);
 991         ieee80211_remove_interfaces(local);
 992  fail_rate:
 993         rtnl_unlock();
 994         ieee80211_wep_free(local);
 995         sta_info_stop(local);
 996         destroy_workqueue(local->workqueue);
 997  fail_workqueue:
 998         wiphy_unregister(local->hw.wiphy);
 999  fail_wiphy_register:
1000         if (local->wiphy_ciphers_allocated)
1001                 kfree(local->hw.wiphy->cipher_suites);
1002         kfree(local->int_scan_req);
1003         return result;
1004 }
1005 EXPORT_SYMBOL(ieee80211_register_hw);
1006
1007 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1008 {
1009         struct ieee80211_local *local = hw_to_local(hw);
1010
1011         tasklet_kill(&local->tx_pending_tasklet);
1012         tasklet_kill(&local->tasklet);
1013
1014         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1015                                &local->network_latency_notifier);
1016 #ifdef CONFIG_INET
1017         unregister_inetaddr_notifier(&local->ifa_notifier);
1018 #endif
1019
1020         rtnl_lock();
1021
1022         /*
1023          * At this point, interface list manipulations are fine
1024          * because the driver cannot be handing us frames any
1025          * more and the tasklet is killed.
1026          */
1027         ieee80211_remove_interfaces(local);
1028
1029         rtnl_unlock();
1030
1031         cancel_work_sync(&local->restart_work);
1032         cancel_work_sync(&local->reconfig_filter);
1033
1034         ieee80211_clear_tx_pending(local);
1035         rate_control_deinitialize(local);
1036
1037         if (skb_queue_len(&local->skb_queue) ||
1038             skb_queue_len(&local->skb_queue_unreliable))
1039                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1040         skb_queue_purge(&local->skb_queue);
1041         skb_queue_purge(&local->skb_queue_unreliable);
1042         skb_queue_purge(&local->rx_skb_queue);
1043
1044         destroy_workqueue(local->workqueue);
1045         wiphy_unregister(local->hw.wiphy);
1046         sta_info_stop(local);
1047         ieee80211_wep_free(local);
1048         ieee80211_led_exit(local);
1049         kfree(local->int_scan_req);
1050 }
1051 EXPORT_SYMBOL(ieee80211_unregister_hw);
1052
1053 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1054 {
1055         WARN_ONCE(1, "Have pending ack frames!\n");
1056         kfree_skb(p);
1057         return 0;
1058 }
1059
1060 void ieee80211_free_hw(struct ieee80211_hw *hw)
1061 {
1062         struct ieee80211_local *local = hw_to_local(hw);
1063
1064         mutex_destroy(&local->iflist_mtx);
1065         mutex_destroy(&local->mtx);
1066
1067         if (local->wiphy_ciphers_allocated)
1068                 kfree(local->hw.wiphy->cipher_suites);
1069
1070         idr_for_each(&local->ack_status_frames,
1071                      ieee80211_free_ack_frame, NULL);
1072         idr_destroy(&local->ack_status_frames);
1073
1074         wiphy_free(local->hw.wiphy);
1075 }
1076 EXPORT_SYMBOL(ieee80211_free_hw);
1077
1078 static int __init ieee80211_init(void)
1079 {
1080         struct sk_buff *skb;
1081         int ret;
1082
1083         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1084         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1085                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1086
1087         ret = rc80211_minstrel_init();
1088         if (ret)
1089                 return ret;
1090
1091         ret = rc80211_minstrel_ht_init();
1092         if (ret)
1093                 goto err_minstrel;
1094
1095         ret = rc80211_pid_init();
1096         if (ret)
1097                 goto err_pid;
1098
1099         ret = ieee80211_iface_init();
1100         if (ret)
1101                 goto err_netdev;
1102
1103         return 0;
1104  err_netdev:
1105         rc80211_pid_exit();
1106  err_pid:
1107         rc80211_minstrel_ht_exit();
1108  err_minstrel:
1109         rc80211_minstrel_exit();
1110
1111         return ret;
1112 }
1113
1114 static void __exit ieee80211_exit(void)
1115 {
1116         rc80211_pid_exit();
1117         rc80211_minstrel_ht_exit();
1118         rc80211_minstrel_exit();
1119
1120         if (mesh_allocated)
1121                 ieee80211s_stop();
1122
1123         ieee80211_iface_exit();
1124
1125         rcu_barrier();
1126 }
1127
1128
1129 subsys_initcall(ieee80211_init);
1130 module_exit(ieee80211_exit);
1131
1132 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1133 MODULE_LICENSE("GPL");