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             !local->ap_power_level)
 155                 power = chan->max_power;
 156         else
 157                 power = min(chan->max_power, local->ap_power_level);
 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 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 209                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 210                 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
 211                           "P2P Device BSS changed %#x", changed);
 212         } else {
 213                 WARN_ON(1);
 214                 return;
 215         }
 216
 217         switch (sdata->vif.type) {
 218         case NL80211_IFTYPE_AP:
 219         case NL80211_IFTYPE_ADHOC:
 220         case NL80211_IFTYPE_WDS:
 221         case NL80211_IFTYPE_MESH_POINT:
 222                 break;
 223         default:
 224                 /* do not warn to simplify caller in scan.c */
 225                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 226                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 227                         return;
 228                 break;
 229         }
 230
 231         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 232                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 233                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 234                         sdata->vif.bss_conf.enable_beacon = false;
 235                 } else {
 236                         /*
 237                          * Beacon should be enabled, but AP mode must
 238                          * check whether there is a beacon configured.
 239                          */
 240                         switch (sdata->vif.type) {
 241                         case NL80211_IFTYPE_AP:
 242                                 sdata->vif.bss_conf.enable_beacon =
 243                                         !!sdata->u.ap.beacon;
 244                                 break;
 245                         case NL80211_IFTYPE_ADHOC:
 246                                 sdata->vif.bss_conf.enable_beacon =
 247                                         !!sdata->u.ibss.presp;
 248                                 break;
 249 #ifdef CONFIG_MAC80211_MESH
 250                         case NL80211_IFTYPE_MESH_POINT:
 251                                 sdata->vif.bss_conf.enable_beacon =
 252                                         !!sdata->u.mesh.mesh_id_len;
 253                                 break;
 254 #endif
 255                         default:
 256                                 /* not reached */
 257                                 WARN_ON(1);
 258                                 break;
 259                         }
 260                 }
 261         }
 262
 263         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 264 }
 265
 266 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 267 {
 268         sdata->vif.bss_conf.use_cts_prot = false;
 269         sdata->vif.bss_conf.use_short_preamble = false;
 270         sdata->vif.bss_conf.use_short_slot = false;
 271         return BSS_CHANGED_ERP_CTS_PROT |
 272                BSS_CHANGED_ERP_PREAMBLE |
 273                BSS_CHANGED_ERP_SLOT;
 274 }
 275
 276 static void ieee80211_tasklet_handler(unsigned long data)
 277 {
 278         struct ieee80211_local *local = (struct ieee80211_local *) data;
 279         struct sta_info *sta, *tmp;
 280         struct skb_eosp_msg_data *eosp_data;
 281         struct sk_buff *skb;
 282
 283         while ((skb = skb_dequeue(&local->skb_queue)) ||
 284                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 285                 switch (skb->pkt_type) {
 286                 case IEEE80211_RX_MSG:
 287                         /* Clear skb->pkt_type in order to not confuse kernel
 288                          * netstack. */
 289                         skb->pkt_type = 0;
 290                         ieee80211_rx(&local->hw, skb);
 291                         break;
 292                 case IEEE80211_TX_STATUS_MSG:
 293                         skb->pkt_type = 0;
 294                         ieee80211_tx_status(&local->hw, skb);
 295                         break;
 296                 case IEEE80211_EOSP_MSG:
 297                         eosp_data = (void *)skb->cb;
 298                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 299                                 /* skip wrong virtual interface */
 300                                 if (memcmp(eosp_data->iface,
 301                                            sta->sdata->vif.addr, ETH_ALEN))
 302                                         continue;
 303                                 clear_sta_flag(sta, WLAN_STA_SP);
 304                                 break;
 305                         }
 306                         dev_kfree_skb(skb);
 307                         break;
 308                 default:
 309                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 310                              skb->pkt_type);
 311                         dev_kfree_skb(skb);
 312                         break;
 313                 }
 314         }
 315 }
 316
 317 static void ieee80211_restart_work(struct work_struct *work)
 318 {
 319         struct ieee80211_local *local =
 320                 container_of(work, struct ieee80211_local, restart_work);
 321
 322         /* wait for scan work complete */
 323         flush_workqueue(local->workqueue);
 324
 325         mutex_lock(&local->mtx);
 326         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 327              rcu_dereference_protected(local->sched_scan_sdata,
 328                                        lockdep_is_held(&local->mtx)),
 329                 "%s called with hardware scan in progress\n", __func__);
 330         mutex_unlock(&local->mtx);
 331
 332         rtnl_lock();
 333         ieee80211_scan_cancel(local);
 334         ieee80211_reconfig(local);
 335         rtnl_unlock();
 336 }
 337
 338 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 339 {
 340         struct ieee80211_local *local = hw_to_local(hw);
 341
 342         trace_api_restart_hw(local);
 343
 344         wiphy_info(hw->wiphy,
 345                    "Hardware restart was requested\n");
 346
 347         /* use this reason, ieee80211_reconfig will unblock it */
 348         ieee80211_stop_queues_by_reason(hw,
 349                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 350
 351         /*
 352          * Stop all Rx during the reconfig. We don't want state changes
 353          * or driver callbacks while this is in progress.
 354          */
 355         local->in_reconfig = true;
 356         barrier();
 357
 358         schedule_work(&local->restart_work);
 359 }
 360 EXPORT_SYMBOL(ieee80211_restart_hw);
 361
 362 static void ieee80211_recalc_smps_work(struct work_struct *work)
 363 {
 364         struct ieee80211_local *local =
 365                 container_of(work, struct ieee80211_local, recalc_smps);
 366
 367         ieee80211_recalc_smps(local);
 368 }
 369
 370 #ifdef CONFIG_INET
 371 static int ieee80211_ifa_changed(struct notifier_block *nb,
 372                                  unsigned long data, void *arg)
 373 {
 374         struct in_ifaddr *ifa = arg;
 375         struct ieee80211_local *local =
 376                 container_of(nb, struct ieee80211_local,
 377                              ifa_notifier);
 378         struct net_device *ndev = ifa->ifa_dev->dev;
 379         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 380         struct in_device *idev;
 381         struct ieee80211_sub_if_data *sdata;
 382         struct ieee80211_bss_conf *bss_conf;
 383         struct ieee80211_if_managed *ifmgd;
 384         int c = 0;
 385
 386         /* Make sure it's our interface that got changed */
 387         if (!wdev)
 388                 return NOTIFY_DONE;
 389
 390         if (wdev->wiphy != local->hw.wiphy)
 391                 return NOTIFY_DONE;
 392
 393         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 394         bss_conf = &sdata->vif.bss_conf;
 395
 396         /* ARP filtering is only supported in managed mode */
 397         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 398                 return NOTIFY_DONE;
 399
 400         idev = __in_dev_get_rtnl(sdata->dev);
 401         if (!idev)
 402                 return NOTIFY_DONE;
 403
 404         ifmgd = &sdata->u.mgd;
 405         mutex_lock(&ifmgd->mtx);
 406
 407         /* Copy the addresses to the bss_conf list */
 408         ifa = idev->ifa_list;
 409         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 410                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 411                 ifa = ifa->ifa_next;
 412                 c++;
 413         }
 414
 415         /* If not all addresses fit the list, disable filtering */
 416         if (ifa) {
 417                 sdata->arp_filter_state = false;
 418                 c = 0;
 419         } else {
 420                 sdata->arp_filter_state = true;
 421         }
 422         bss_conf->arp_addr_cnt = c;
 423
 424         /* Configure driver only if associated (which also implies it is up) */
 425         if (ifmgd->associated) {
 426                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 427                 ieee80211_bss_info_change_notify(sdata,
 428                                                  BSS_CHANGED_ARP_FILTER);
 429         }
 430
 431         mutex_unlock(&ifmgd->mtx);
 432
 433         return NOTIFY_DONE;
 434 }
 435 #endif
 436
 437 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 438 {
 439         struct ieee80211_local *local =
 440                 container_of(napi, struct ieee80211_local, napi);
 441
 442         return local->ops->napi_poll(&local->hw, budget);
 443 }
 444
 445 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 446 {
 447         struct ieee80211_local *local = hw_to_local(hw);
 448
 449         napi_schedule(&local->napi);
 450 }
 451 EXPORT_SYMBOL(ieee80211_napi_schedule);
 452
 453 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 454 {
 455         struct ieee80211_local *local = hw_to_local(hw);
 456
 457         napi_complete(&local->napi);
 458 }
 459 EXPORT_SYMBOL(ieee80211_napi_complete);
 460
 461 /* There isn't a lot of sense in it, but you can transmit anything you like */
 462 static const struct ieee80211_txrx_stypes
 463 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 464         [NL80211_IFTYPE_ADHOC] = {
 465                 .tx = 0xffff,
 466                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 467                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 468                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 469         },
 470         [NL80211_IFTYPE_STATION] = {
 471                 .tx = 0xffff,
 472                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 474         },
 475         [NL80211_IFTYPE_AP] = {
 476                 .tx = 0xffff,
 477                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 478                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 479                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 480                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 481                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 482                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 483                         BIT(IEEE80211_STYPE_ACTION >> 4),
 484         },
 485         [NL80211_IFTYPE_AP_VLAN] = {
 486                 /* copy AP */
 487                 .tx = 0xffff,
 488                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 489                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 490                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 491                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 492                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 493                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 494                         BIT(IEEE80211_STYPE_ACTION >> 4),
 495         },
 496         [NL80211_IFTYPE_P2P_CLIENT] = {
 497                 .tx = 0xffff,
 498                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 499                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 500         },
 501         [NL80211_IFTYPE_P2P_GO] = {
 502                 .tx = 0xffff,
 503                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 504                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 505                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 506                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 507                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 508                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 509                         BIT(IEEE80211_STYPE_ACTION >> 4),
 510         },
 511         [NL80211_IFTYPE_MESH_POINT] = {
 512                 .tx = 0xffff,
 513                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 514                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 515                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 516         },
 517         [NL80211_IFTYPE_P2P_DEVICE] = {
 518                 .tx = 0xffff,
 519                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 520                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 521         },
 522 };
 523
 524 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 525         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 526                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 527
 528         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 529                                 IEEE80211_HT_CAP_MAX_AMSDU |
 530                                 IEEE80211_HT_CAP_SGI_40),
 531         .mcs = {
 532                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 533                              0xff, 0xff, 0xff, 0xff, 0xff, },
 534         },
 535 };
 536
 537 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 538                                         const struct ieee80211_ops *ops)
 539 {
 540         struct ieee80211_local *local;
 541         int priv_size, i;
 542         struct wiphy *wiphy;
 543
 544         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 545                     !ops->add_interface || !ops->remove_interface ||
 546                     !ops->configure_filter))
 547                 return NULL;
 548
 549         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 550                 return NULL;
 551
 552         /* Ensure 32-byte alignment of our private data and hw private data.
 553          * We use the wiphy priv data for both our ieee80211_local and for
 554          * the driver's private data
 555          *
 556          * In memory it'll be like this:
 557          *
 558          * +-------------------------+
 559          * | struct wiphy           |
 560          * +-------------------------+
 561          * | struct ieee80211_local  |
 562          * +-------------------------+
 563          * | driver's private data   |
 564          * +-------------------------+
 565          *
 566          */
 567         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 568
 569         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 570
 571         if (!wiphy)
 572                 return NULL;
 573
 574         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 575
 576         wiphy->privid = mac80211_wiphy_privid;
 577
 578         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 579                         WIPHY_FLAG_4ADDR_AP |
 580                         WIPHY_FLAG_4ADDR_STATION |
 581                         WIPHY_FLAG_REPORTS_OBSS |
 582                         WIPHY_FLAG_OFFCHAN_TX;
 583
 584         if (ops->remain_on_channel)
 585                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 586
 587         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 588                           NL80211_FEATURE_HT_IBSS;
 589
 590         if (!ops->set_key)
 591                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 592
 593         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 594
 595         local = wiphy_priv(wiphy);
 596
 597         local->hw.wiphy = wiphy;
 598
 599         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 600
 601         local->ops = ops;
 602
 603         /* set up some defaults */
 604         local->hw.queues = 1;
 605         local->hw.max_rates = 1;
 606         local->hw.max_report_rates = 0;
 607         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 608         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 609         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 610         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 611         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 612         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 613                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 614                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 615         local->user_power_level = -1;
 616         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 617
 618         INIT_LIST_HEAD(&local->interfaces);
 619
 620         __hw_addr_init(&local->mc_list);
 621
 622         mutex_init(&local->iflist_mtx);
 623         mutex_init(&local->mtx);
 624
 625         mutex_init(&local->key_mtx);
 626         spin_lock_init(&local->filter_lock);
 627         spin_lock_init(&local->queue_stop_reason_lock);
 628
 629         /*
 630          * The rx_skb_queue is only accessed from tasklets,
 631          * but other SKB queues are used from within IRQ
 632          * context. Therefore, this one needs a different
 633          * locking class so our direct, non-irq-safe use of
 634          * the queue's lock doesn't throw lockdep warnings.
 635          */
 636         skb_queue_head_init_class(&local->rx_skb_queue,
 637                                   &ieee80211_rx_skb_queue_class);
 638
 639         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 640
 641         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 642
 643         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 644         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 645         local->smps_mode = IEEE80211_SMPS_OFF;
 646
 647         INIT_WORK(&local->dynamic_ps_enable_work,
 648                   ieee80211_dynamic_ps_enable_work);
 649         INIT_WORK(&local->dynamic_ps_disable_work,
 650                   ieee80211_dynamic_ps_disable_work);
 651         setup_timer(&local->dynamic_ps_timer,
 652                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 653
 654         INIT_WORK(&local->sched_scan_stopped_work,
 655                   ieee80211_sched_scan_stopped_work);
 656
 657         spin_lock_init(&local->ack_status_lock);
 658         idr_init(&local->ack_status_frames);
 659         /* preallocate at least one entry */
 660         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 661
 662         sta_info_init(local);
 663
 664         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 665                 skb_queue_head_init(&local->pending[i]);
 666                 atomic_set(&local->agg_queue_stop[i], 0);
 667         }
 668         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 669                      (unsigned long)local);
 670
 671         tasklet_init(&local->tasklet,
 672                      ieee80211_tasklet_handler,
 673                      (unsigned long) local);
 674
 675         skb_queue_head_init(&local->skb_queue);
 676         skb_queue_head_init(&local->skb_queue_unreliable);
 677
 678         /* init dummy netdev for use w/ NAPI */
 679         init_dummy_netdev(&local->napi_dev);
 680
 681         ieee80211_led_names(local);
 682
 683         ieee80211_roc_setup(local);
 684
 685         return &local->hw;
 686 }
 687 EXPORT_SYMBOL(ieee80211_alloc_hw);
 688
 689 int ieee80211_register_hw(struct ieee80211_hw *hw)
 690 {
 691         struct ieee80211_local *local = hw_to_local(hw);
 692         int result, i;
 693         enum ieee80211_band band;
 694         int channels, max_bitrates;
 695         bool supp_ht, supp_vht;
 696         netdev_features_t feature_whitelist;
 697         static const u32 cipher_suites[] = {
 698                 /* keep WEP first, it may be removed below */
 699                 WLAN_CIPHER_SUITE_WEP40,
 700                 WLAN_CIPHER_SUITE_WEP104,
 701                 WLAN_CIPHER_SUITE_TKIP,
 702                 WLAN_CIPHER_SUITE_CCMP,
 703
 704                 /* keep last -- depends on hw flags! */
 705                 WLAN_CIPHER_SUITE_AES_CMAC
 706         };
 707
 708         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 709             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 710              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 711                 return -EINVAL;
 712
 713 #ifdef CONFIG_PM
 714         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 715             (!local->ops->suspend || !local->ops->resume))
 716                 return -EINVAL;
 717 #endif
 718
 719         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 720                 return -EINVAL;
 721
 722         /* Only HW csum features are currently compatible with mac80211 */
 723         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 724                             NETIF_F_HW_CSUM;
 725         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 726                 return -EINVAL;
 727
 728         if (hw->max_report_rates == 0)
 729                 hw->max_report_rates = hw->max_rates;
 730
 731         /*
 732          * generic code guarantees at least one band,
 733          * set this very early because much code assumes
 734          * that hw.conf.channel is assigned
 735          */
 736         channels = 0;
 737         max_bitrates = 0;
 738         supp_ht = false;
 739         supp_vht = false;
 740         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 741                 struct ieee80211_supported_band *sband;
 742
 743                 sband = local->hw.wiphy->bands[band];
 744                 if (!sband)
 745                         continue;
 746                 if (!local->oper_channel) {
 747                         /* init channel we're on */
 748                         local->hw.conf.channel =
 749                         local->oper_channel = &sband->channels[0];
 750                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 751                 }
 752                 channels += sband->n_channels;
 753
 754                 if (max_bitrates < sband->n_bitrates)
 755                         max_bitrates = sband->n_bitrates;
 756                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 757                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 758         }
 759
 760         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 761                                       sizeof(void *) * channels, GFP_KERNEL);
 762         if (!local->int_scan_req)
 763                 return -ENOMEM;
 764
 765         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 766                 if (!local->hw.wiphy->bands[band])
 767                         continue;
 768                 local->int_scan_req->rates[band] = (u32) -1;
 769         }
 770
 771         /* if low-level driver supports AP, we also support VLAN */
 772         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 773                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 774                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 775         }
 776
 777         /* mac80211 always supports monitor */
 778         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 779         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 780
 781         /*
 782          * mac80211 doesn't support more than 1 channel, and also not more
 783          * than one IBSS interface
 784          */
 785         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 786                 const struct ieee80211_iface_combination *c;
 787                 int j;
 788
 789                 c = &hw->wiphy->iface_combinations[i];
 790
 791                 if (c->num_different_channels > 1)
 792                         return -EINVAL;
 793
 794                 for (j = 0; j < c->n_limits; j++)
 795                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 796                             c->limits[j].max > 1)
 797                                 return -EINVAL;
 798         }
 799
 800 #ifndef CONFIG_MAC80211_MESH
 801         /* mesh depends on Kconfig, but drivers should set it if they want */
 802         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 803 #endif
 804
 805         /* if the underlying driver supports mesh, mac80211 will (at least)
 806          * provide routing of mesh authentication frames to userspace */
 807         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 808                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 809
 810         /* mac80211 supports control port protocol changing */
 811         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 812
 813         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 814                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 815         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 816                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 817
 818         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 819              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 820              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 821
 822         /*
 823          * Calculate scan IE length -- we need this to alloc
 824          * memory and to subtract from the driver limit. It
 825          * includes the DS Params, (extended) supported rates, and HT
 826          * information -- SSID is the driver's responsibility.
 827          */
 828         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 829                 3 /* DS Params */;
 830         if (supp_ht)
 831                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 832
 833         if (supp_vht)
 834                 local->scan_ies_len +=
 835                         2 + sizeof(struct ieee80211_vht_capabilities);
 836
 837         if (!local->ops->hw_scan) {
 838                 /* For hw_scan, driver needs to set these up. */
 839                 local->hw.wiphy->max_scan_ssids = 4;
 840                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 841         }
 842
 843         /*
 844          * If the driver supports any scan IEs, then assume the
 845          * limit includes the IEs mac80211 will add, otherwise
 846          * leave it at zero and let the driver sort it out; we
 847          * still pass our IEs to the driver but userspace will
 848          * not be allowed to in that case.
 849          */
 850         if (local->hw.wiphy->max_scan_ie_len)
 851                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 852
 853         /* Set up cipher suites unless driver already did */
 854         if (!local->hw.wiphy->cipher_suites) {
 855                 local->hw.wiphy->cipher_suites = cipher_suites;
 856                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 857                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 858                         local->hw.wiphy->n_cipher_suites--;
 859         }
 860         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 861                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 862                         local->hw.wiphy->cipher_suites += 2;
 863                         local->hw.wiphy->n_cipher_suites -= 2;
 864                 } else {
 865                         u32 *suites;
 866                         int r, w = 0;
 867
 868                         /* Filter out WEP */
 869
 870                         suites = kmemdup(
 871                                 local->hw.wiphy->cipher_suites,
 872                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 873                                 GFP_KERNEL);
 874                         if (!suites) {
 875                                 result = -ENOMEM;
 876                                 goto fail_wiphy_register;
 877                         }
 878                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 879                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 880                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 881                                     suite == WLAN_CIPHER_SUITE_WEP104)
 882                                         continue;
 883                                 suites[w++] = suite;
 884                         }
 885                         local->hw.wiphy->cipher_suites = suites;
 886                         local->hw.wiphy->n_cipher_suites = w;
 887                         local->wiphy_ciphers_allocated = true;
 888                 }
 889         }
 890
 891         if (!local->ops->remain_on_channel)
 892                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 893
 894         if (local->ops->sched_scan_start)
 895                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 896
 897         /* mac80211 based drivers don't support internal TDLS setup */
 898         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 899                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 900
 901         result = wiphy_register(local->hw.wiphy);
 902         if (result < 0)
 903                 goto fail_wiphy_register;
 904
 905         /*
 906          * We use the number of queues for feature tests (QoS, HT) internally
 907          * so restrict them appropriately.
 908          */
 909         if (hw->queues > IEEE80211_MAX_QUEUES)
 910                 hw->queues = IEEE80211_MAX_QUEUES;
 911
 912         local->workqueue =
 913                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 914         if (!local->workqueue) {
 915                 result = -ENOMEM;
 916                 goto fail_workqueue;
 917         }
 918
 919         /*
 920          * The hardware needs headroom for sending the frame,
 921          * and we need some headroom for passing the frame to monitor
 922          * interfaces, but never both at the same time.
 923          */
 924         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 925                                    IEEE80211_TX_STATUS_HEADROOM);
 926
 927         debugfs_hw_add(local);
 928
 929         /*
 930          * if the driver doesn't specify a max listen interval we
 931          * use 5 which should be a safe default
 932          */
 933         if (local->hw.max_listen_interval == 0)
 934                 local->hw.max_listen_interval = 5;
 935
 936         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 937
 938         local->dynamic_ps_forced_timeout = -1;
 939
 940         result = ieee80211_wep_init(local);
 941         if (result < 0)
 942                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 943                             result);
 944
 945         ieee80211_led_init(local);
 946
 947         rtnl_lock();
 948
 949         result = ieee80211_init_rate_ctrl_alg(local,
 950                                               hw->rate_control_algorithm);
 951         if (result < 0) {
 952                 wiphy_debug(local->hw.wiphy,
 953                             "Failed to initialize rate control algorithm\n");
 954                 goto fail_rate;
 955         }
 956
 957         /* add one default STA interface if supported */
 958         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 959                 result = ieee80211_if_add(local, "wlan%d", NULL,
 960                                           NL80211_IFTYPE_STATION, NULL);
 961                 if (result)
 962                         wiphy_warn(local->hw.wiphy,
 963                                    "Failed to add default virtual iface\n");
 964         }
 965
 966         rtnl_unlock();
 967
 968         local->network_latency_notifier.notifier_call =
 969                 ieee80211_max_network_latency;
 970         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 971                                      &local->network_latency_notifier);
 972         if (result) {
 973                 rtnl_lock();
 974                 goto fail_pm_qos;
 975         }
 976
 977 #ifdef CONFIG_INET
 978         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 979         result = register_inetaddr_notifier(&local->ifa_notifier);
 980         if (result)
 981                 goto fail_ifa;
 982 #endif
 983
 984         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 985                         local->hw.napi_weight);
 986
 987         return 0;
 988
 989 #ifdef CONFIG_INET
 990  fail_ifa:
 991         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 992                                &local->network_latency_notifier);
 993         rtnl_lock();
 994 #endif
 995  fail_pm_qos:
 996         ieee80211_led_exit(local);
 997         ieee80211_remove_interfaces(local);
 998  fail_rate:
 999         rtnl_unlock();
1000         ieee80211_wep_free(local);
1001         sta_info_stop(local);
1002         destroy_workqueue(local->workqueue);
1003  fail_workqueue:
1004         wiphy_unregister(local->hw.wiphy);
1005  fail_wiphy_register:
1006         if (local->wiphy_ciphers_allocated)
1007                 kfree(local->hw.wiphy->cipher_suites);
1008         kfree(local->int_scan_req);
1009         return result;
1010 }
1011 EXPORT_SYMBOL(ieee80211_register_hw);
1012
1013 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1014 {
1015         struct ieee80211_local *local = hw_to_local(hw);
1016
1017         tasklet_kill(&local->tx_pending_tasklet);
1018         tasklet_kill(&local->tasklet);
1019
1020         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1021                                &local->network_latency_notifier);
1022 #ifdef CONFIG_INET
1023         unregister_inetaddr_notifier(&local->ifa_notifier);
1024 #endif
1025
1026         rtnl_lock();
1027
1028         /*
1029          * At this point, interface list manipulations are fine
1030          * because the driver cannot be handing us frames any
1031          * more and the tasklet is killed.
1032          */
1033         ieee80211_remove_interfaces(local);
1034
1035         rtnl_unlock();
1036
1037         cancel_work_sync(&local->restart_work);
1038         cancel_work_sync(&local->reconfig_filter);
1039
1040         ieee80211_clear_tx_pending(local);
1041         rate_control_deinitialize(local);
1042
1043         if (skb_queue_len(&local->skb_queue) ||
1044             skb_queue_len(&local->skb_queue_unreliable))
1045                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1046         skb_queue_purge(&local->skb_queue);
1047         skb_queue_purge(&local->skb_queue_unreliable);
1048         skb_queue_purge(&local->rx_skb_queue);
1049
1050         destroy_workqueue(local->workqueue);
1051         wiphy_unregister(local->hw.wiphy);
1052         sta_info_stop(local);
1053         ieee80211_wep_free(local);
1054         ieee80211_led_exit(local);
1055         kfree(local->int_scan_req);
1056 }
1057 EXPORT_SYMBOL(ieee80211_unregister_hw);
1058
1059 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1060 {
1061         WARN_ONCE(1, "Have pending ack frames!\n");
1062         kfree_skb(p);
1063         return 0;
1064 }
1065
1066 void ieee80211_free_hw(struct ieee80211_hw *hw)
1067 {
1068         struct ieee80211_local *local = hw_to_local(hw);
1069
1070         mutex_destroy(&local->iflist_mtx);
1071         mutex_destroy(&local->mtx);
1072
1073         if (local->wiphy_ciphers_allocated)
1074                 kfree(local->hw.wiphy->cipher_suites);
1075
1076         idr_for_each(&local->ack_status_frames,
1077                      ieee80211_free_ack_frame, NULL);
1078         idr_destroy(&local->ack_status_frames);
1079
1080         wiphy_free(local->hw.wiphy);
1081 }
1082 EXPORT_SYMBOL(ieee80211_free_hw);
1083
1084 static int __init ieee80211_init(void)
1085 {
1086         struct sk_buff *skb;
1087         int ret;
1088
1089         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1090         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1091                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1092
1093         ret = rc80211_minstrel_init();
1094         if (ret)
1095                 return ret;
1096
1097         ret = rc80211_minstrel_ht_init();
1098         if (ret)
1099                 goto err_minstrel;
1100
1101         ret = rc80211_pid_init();
1102         if (ret)
1103                 goto err_pid;
1104
1105         ret = ieee80211_iface_init();
1106         if (ret)
1107                 goto err_netdev;
1108
1109         return 0;
1110  err_netdev:
1111         rc80211_pid_exit();
1112  err_pid:
1113         rc80211_minstrel_ht_exit();
1114  err_minstrel:
1115         rc80211_minstrel_exit();
1116
1117         return ret;
1118 }
1119
1120 static void __exit ieee80211_exit(void)
1121 {
1122         rc80211_pid_exit();
1123         rc80211_minstrel_ht_exit();
1124         rc80211_minstrel_exit();
1125
1126         if (mesh_allocated)
1127                 ieee80211s_stop();
1128
1129         ieee80211_iface_exit();
1130
1131         rcu_barrier();
1132 }
1133
1134
1135 subsys_initcall(ieee80211_init);
1136 module_exit(ieee80211_exit);
1137
1138 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1139 MODULE_LICENSE("GPL");