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 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  97 {
  98         struct ieee80211_sub_if_data *sdata;
  99         struct ieee80211_channel *chan;
 100         u32 changed = 0;
 101         int power;
 102         enum nl80211_channel_type channel_type;
 103         u32 offchannel_flag;
 104         bool scanning = false;
 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 = NL80211_CHAN_NO_HT;
 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         scanning = 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
 156         rcu_read_lock();
 157         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 158                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 159                         continue;
 160                 power = min(power, sdata->vif.bss_conf.txpower);
 161         }
 162         rcu_read_unlock();
 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         return changed;
 170 }
 171
 172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 173 {
 174         int ret = 0;
 175
 176         might_sleep();
 177
 178         if (!local->use_chanctx)
 179                 changed |= ieee80211_hw_conf_chan(local);
 180         else
 181                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 182                              IEEE80211_CONF_CHANGE_POWER);
 183
 184         if (changed && local->open_count) {
 185                 ret = drv_config(local, changed);
 186                 /*
 187                  * Goal:
 188                  * HW reconfiguration should never fail, the driver has told
 189                  * us what it can support so it should live up to that promise.
 190                  *
 191                  * Current status:
 192                  * rfkill is not integrated with mac80211 and a
 193                  * configuration command can thus fail if hardware rfkill
 194                  * is enabled
 195                  *
 196                  * FIXME: integrate rfkill with mac80211 and then add this
 197                  * WARN_ON() back
 198                  *
 199                  */
 200                 /* WARN_ON(ret); */
 201         }
 202
 203         return ret;
 204 }
 205
 206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 207                                       u32 changed)
 208 {
 209         struct ieee80211_local *local = sdata->local;
 210
 211         if (!changed)
 212                 return;
 213
 214         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 215 }
 216
 217 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 218 {
 219         sdata->vif.bss_conf.use_cts_prot = false;
 220         sdata->vif.bss_conf.use_short_preamble = false;
 221         sdata->vif.bss_conf.use_short_slot = false;
 222         return BSS_CHANGED_ERP_CTS_PROT |
 223                BSS_CHANGED_ERP_PREAMBLE |
 224                BSS_CHANGED_ERP_SLOT;
 225 }
 226
 227 static void ieee80211_tasklet_handler(unsigned long data)
 228 {
 229         struct ieee80211_local *local = (struct ieee80211_local *) data;
 230         struct sta_info *sta, *tmp;
 231         struct skb_eosp_msg_data *eosp_data;
 232         struct sk_buff *skb;
 233
 234         while ((skb = skb_dequeue(&local->skb_queue)) ||
 235                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 236                 switch (skb->pkt_type) {
 237                 case IEEE80211_RX_MSG:
 238                         /* Clear skb->pkt_type in order to not confuse kernel
 239                          * netstack. */
 240                         skb->pkt_type = 0;
 241                         ieee80211_rx(&local->hw, skb);
 242                         break;
 243                 case IEEE80211_TX_STATUS_MSG:
 244                         skb->pkt_type = 0;
 245                         ieee80211_tx_status(&local->hw, skb);
 246                         break;
 247                 case IEEE80211_EOSP_MSG:
 248                         eosp_data = (void *)skb->cb;
 249                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 250                                 /* skip wrong virtual interface */
 251                                 if (memcmp(eosp_data->iface,
 252                                            sta->sdata->vif.addr, ETH_ALEN))
 253                                         continue;
 254                                 clear_sta_flag(sta, WLAN_STA_SP);
 255                                 break;
 256                         }
 257                         dev_kfree_skb(skb);
 258                         break;
 259                 default:
 260                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 261                              skb->pkt_type);
 262                         dev_kfree_skb(skb);
 263                         break;
 264                 }
 265         }
 266 }
 267
 268 static void ieee80211_restart_work(struct work_struct *work)
 269 {
 270         struct ieee80211_local *local =
 271                 container_of(work, struct ieee80211_local, restart_work);
 272
 273         /* wait for scan work complete */
 274         flush_workqueue(local->workqueue);
 275
 276         mutex_lock(&local->mtx);
 277         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 278              rcu_dereference_protected(local->sched_scan_sdata,
 279                                        lockdep_is_held(&local->mtx)),
 280                 "%s called with hardware scan in progress\n", __func__);
 281         mutex_unlock(&local->mtx);
 282
 283         rtnl_lock();
 284         ieee80211_scan_cancel(local);
 285         ieee80211_reconfig(local);
 286         rtnl_unlock();
 287 }
 288
 289 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 290 {
 291         struct ieee80211_local *local = hw_to_local(hw);
 292
 293         trace_api_restart_hw(local);
 294
 295         wiphy_info(hw->wiphy,
 296                    "Hardware restart was requested\n");
 297
 298         /* use this reason, ieee80211_reconfig will unblock it */
 299         ieee80211_stop_queues_by_reason(hw,
 300                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 301
 302         /*
 303          * Stop all Rx during the reconfig. We don't want state changes
 304          * or driver callbacks while this is in progress.
 305          */
 306         local->in_reconfig = true;
 307         barrier();
 308
 309         schedule_work(&local->restart_work);
 310 }
 311 EXPORT_SYMBOL(ieee80211_restart_hw);
 312
 313 #ifdef CONFIG_INET
 314 static int ieee80211_ifa_changed(struct notifier_block *nb,
 315                                  unsigned long data, void *arg)
 316 {
 317         struct in_ifaddr *ifa = arg;
 318         struct ieee80211_local *local =
 319                 container_of(nb, struct ieee80211_local,
 320                              ifa_notifier);
 321         struct net_device *ndev = ifa->ifa_dev->dev;
 322         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 323         struct in_device *idev;
 324         struct ieee80211_sub_if_data *sdata;
 325         struct ieee80211_bss_conf *bss_conf;
 326         struct ieee80211_if_managed *ifmgd;
 327         int c = 0;
 328
 329         /* Make sure it's our interface that got changed */
 330         if (!wdev)
 331                 return NOTIFY_DONE;
 332
 333         if (wdev->wiphy != local->hw.wiphy)
 334                 return NOTIFY_DONE;
 335
 336         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 337         bss_conf = &sdata->vif.bss_conf;
 338
 339         /* ARP filtering is only supported in managed mode */
 340         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 341                 return NOTIFY_DONE;
 342
 343         idev = __in_dev_get_rtnl(sdata->dev);
 344         if (!idev)
 345                 return NOTIFY_DONE;
 346
 347         ifmgd = &sdata->u.mgd;
 348         mutex_lock(&ifmgd->mtx);
 349
 350         /* Copy the addresses to the bss_conf list */
 351         ifa = idev->ifa_list;
 352         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 353                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 354                 ifa = ifa->ifa_next;
 355                 c++;
 356         }
 357
 358         /* If not all addresses fit the list, disable filtering */
 359         if (ifa) {
 360                 sdata->arp_filter_state = false;
 361                 c = 0;
 362         } else {
 363                 sdata->arp_filter_state = true;
 364         }
 365         bss_conf->arp_addr_cnt = c;
 366
 367         /* Configure driver only if associated (which also implies it is up) */
 368         if (ifmgd->associated) {
 369                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 370                 ieee80211_bss_info_change_notify(sdata,
 371                                                  BSS_CHANGED_ARP_FILTER);
 372         }
 373
 374         mutex_unlock(&ifmgd->mtx);
 375
 376         return NOTIFY_DONE;
 377 }
 378 #endif
 379
 380 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 381 {
 382         struct ieee80211_local *local =
 383                 container_of(napi, struct ieee80211_local, napi);
 384
 385         return local->ops->napi_poll(&local->hw, budget);
 386 }
 387
 388 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 389 {
 390         struct ieee80211_local *local = hw_to_local(hw);
 391
 392         napi_schedule(&local->napi);
 393 }
 394 EXPORT_SYMBOL(ieee80211_napi_schedule);
 395
 396 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 397 {
 398         struct ieee80211_local *local = hw_to_local(hw);
 399
 400         napi_complete(&local->napi);
 401 }
 402 EXPORT_SYMBOL(ieee80211_napi_complete);
 403
 404 /* There isn't a lot of sense in it, but you can transmit anything you like */
 405 static const struct ieee80211_txrx_stypes
 406 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 407         [NL80211_IFTYPE_ADHOC] = {
 408                 .tx = 0xffff,
 409                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 410                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 411                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 412                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 413         },
 414         [NL80211_IFTYPE_STATION] = {
 415                 .tx = 0xffff,
 416                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 417                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 418         },
 419         [NL80211_IFTYPE_AP] = {
 420                 .tx = 0xffff,
 421                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 422                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 423                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 424                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 425                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 426                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 427                         BIT(IEEE80211_STYPE_ACTION >> 4),
 428         },
 429         [NL80211_IFTYPE_AP_VLAN] = {
 430                 /* copy AP */
 431                 .tx = 0xffff,
 432                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 433                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 434                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 435                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 436                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 437                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 438                         BIT(IEEE80211_STYPE_ACTION >> 4),
 439         },
 440         [NL80211_IFTYPE_P2P_CLIENT] = {
 441                 .tx = 0xffff,
 442                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 443                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 444         },
 445         [NL80211_IFTYPE_P2P_GO] = {
 446                 .tx = 0xffff,
 447                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 448                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 450                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 451                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 452                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 453                         BIT(IEEE80211_STYPE_ACTION >> 4),
 454         },
 455         [NL80211_IFTYPE_MESH_POINT] = {
 456                 .tx = 0xffff,
 457                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 458                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 459                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 460         },
 461         [NL80211_IFTYPE_P2P_DEVICE] = {
 462                 .tx = 0xffff,
 463                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 464                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 465         },
 466 };
 467
 468 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 469         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 470                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 471
 472         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 473                                 IEEE80211_HT_CAP_MAX_AMSDU |
 474                                 IEEE80211_HT_CAP_SGI_20 |
 475                                 IEEE80211_HT_CAP_SGI_40),
 476         .mcs = {
 477                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 478                              0xff, 0xff, 0xff, 0xff, 0xff, },
 479         },
 480 };
 481
 482 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 483                                         const struct ieee80211_ops *ops)
 484 {
 485         struct ieee80211_local *local;
 486         int priv_size, i;
 487         struct wiphy *wiphy;
 488         bool use_chanctx;
 489
 490         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 491                     !ops->add_interface || !ops->remove_interface ||
 492                     !ops->configure_filter))
 493                 return NULL;
 494
 495         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 496                 return NULL;
 497
 498         /* check all or no channel context operations exist */
 499         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 500             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 501             !!ops->unassign_vif_chanctx;
 502         if (WARN_ON(i != 0 && i != 5))
 503                 return NULL;
 504         use_chanctx = i == 5;
 505
 506         /* Ensure 32-byte alignment of our private data and hw private data.
 507          * We use the wiphy priv data for both our ieee80211_local and for
 508          * the driver's private data
 509          *
 510          * In memory it'll be like this:
 511          *
 512          * +-------------------------+
 513          * | struct wiphy           |
 514          * +-------------------------+
 515          * | struct ieee80211_local  |
 516          * +-------------------------+
 517          * | driver's private data   |
 518          * +-------------------------+
 519          *
 520          */
 521         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 522
 523         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 524
 525         if (!wiphy)
 526                 return NULL;
 527
 528         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 529
 530         wiphy->privid = mac80211_wiphy_privid;
 531
 532         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 533                         WIPHY_FLAG_4ADDR_AP |
 534                         WIPHY_FLAG_4ADDR_STATION |
 535                         WIPHY_FLAG_REPORTS_OBSS |
 536                         WIPHY_FLAG_OFFCHAN_TX;
 537
 538         if (ops->remain_on_channel)
 539                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 540
 541         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 542                            NL80211_FEATURE_SAE |
 543                            NL80211_FEATURE_HT_IBSS |
 544                            NL80211_FEATURE_VIF_TXPOWER |
 545                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 546
 547         if (!ops->hw_scan)
 548                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 549                                    NL80211_FEATURE_AP_SCAN;
 550
 551
 552         if (!ops->set_key)
 553                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 554
 555         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 556
 557         local = wiphy_priv(wiphy);
 558
 559         local->hw.wiphy = wiphy;
 560
 561         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 562
 563         local->ops = ops;
 564         local->use_chanctx = use_chanctx;
 565
 566         /* set up some defaults */
 567         local->hw.queues = 1;
 568         local->hw.max_rates = 1;
 569         local->hw.max_report_rates = 0;
 570         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 571         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 572         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 573         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 574         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 575         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 576                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 577                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 578         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 579                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 580         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 581         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 582
 583         INIT_LIST_HEAD(&local->interfaces);
 584
 585         __hw_addr_init(&local->mc_list);
 586
 587         mutex_init(&local->iflist_mtx);
 588         mutex_init(&local->mtx);
 589
 590         mutex_init(&local->key_mtx);
 591         spin_lock_init(&local->filter_lock);
 592         spin_lock_init(&local->queue_stop_reason_lock);
 593
 594         INIT_LIST_HEAD(&local->chanctx_list);
 595         mutex_init(&local->chanctx_mtx);
 596
 597         /*
 598          * The rx_skb_queue is only accessed from tasklets,
 599          * but other SKB queues are used from within IRQ
 600          * context. Therefore, this one needs a different
 601          * locking class so our direct, non-irq-safe use of
 602          * the queue's lock doesn't throw lockdep warnings.
 603          */
 604         skb_queue_head_init_class(&local->rx_skb_queue,
 605                                   &ieee80211_rx_skb_queue_class);
 606
 607         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 608
 609         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 610
 611         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 612         local->smps_mode = IEEE80211_SMPS_OFF;
 613
 614         INIT_WORK(&local->dynamic_ps_enable_work,
 615                   ieee80211_dynamic_ps_enable_work);
 616         INIT_WORK(&local->dynamic_ps_disable_work,
 617                   ieee80211_dynamic_ps_disable_work);
 618         setup_timer(&local->dynamic_ps_timer,
 619                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 620
 621         INIT_WORK(&local->sched_scan_stopped_work,
 622                   ieee80211_sched_scan_stopped_work);
 623
 624         spin_lock_init(&local->ack_status_lock);
 625         idr_init(&local->ack_status_frames);
 626         /* preallocate at least one entry */
 627         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 628
 629         sta_info_init(local);
 630
 631         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 632                 skb_queue_head_init(&local->pending[i]);
 633                 atomic_set(&local->agg_queue_stop[i], 0);
 634         }
 635         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 636                      (unsigned long)local);
 637
 638         tasklet_init(&local->tasklet,
 639                      ieee80211_tasklet_handler,
 640                      (unsigned long) local);
 641
 642         skb_queue_head_init(&local->skb_queue);
 643         skb_queue_head_init(&local->skb_queue_unreliable);
 644
 645         /* init dummy netdev for use w/ NAPI */
 646         init_dummy_netdev(&local->napi_dev);
 647
 648         ieee80211_led_names(local);
 649
 650         ieee80211_roc_setup(local);
 651
 652         return &local->hw;
 653 }
 654 EXPORT_SYMBOL(ieee80211_alloc_hw);
 655
 656 int ieee80211_register_hw(struct ieee80211_hw *hw)
 657 {
 658         struct ieee80211_local *local = hw_to_local(hw);
 659         int result, i;
 660         enum ieee80211_band band;
 661         int channels, max_bitrates;
 662         bool supp_ht, supp_vht;
 663         netdev_features_t feature_whitelist;
 664         static const u32 cipher_suites[] = {
 665                 /* keep WEP first, it may be removed below */
 666                 WLAN_CIPHER_SUITE_WEP40,
 667                 WLAN_CIPHER_SUITE_WEP104,
 668                 WLAN_CIPHER_SUITE_TKIP,
 669                 WLAN_CIPHER_SUITE_CCMP,
 670
 671                 /* keep last -- depends on hw flags! */
 672                 WLAN_CIPHER_SUITE_AES_CMAC
 673         };
 674
 675         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 676             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 677              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 678                 return -EINVAL;
 679
 680 #ifdef CONFIG_PM
 681         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 682             (!local->ops->suspend || !local->ops->resume))
 683                 return -EINVAL;
 684 #endif
 685
 686         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 687                 return -EINVAL;
 688
 689         if (!local->use_chanctx) {
 690                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 691                         const struct ieee80211_iface_combination *comb;
 692
 693                         comb = &local->hw.wiphy->iface_combinations[i];
 694
 695                         if (comb->num_different_channels > 1)
 696                                 return -EINVAL;
 697                 }
 698         } else {
 699                 /*
 700                  * WDS is currently prohibited when channel contexts are used
 701                  * because there's no clear definition of which channel WDS
 702                  * type interfaces use
 703                  */
 704                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 705                         return -EINVAL;
 706         }
 707
 708         /* Only HW csum features are currently compatible with mac80211 */
 709         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 710                             NETIF_F_HW_CSUM;
 711         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 712                 return -EINVAL;
 713
 714         if (hw->max_report_rates == 0)
 715                 hw->max_report_rates = hw->max_rates;
 716
 717         local->rx_chains = 1;
 718
 719         /*
 720          * generic code guarantees at least one band,
 721          * set this very early because much code assumes
 722          * that hw.conf.channel is assigned
 723          */
 724         channels = 0;
 725         max_bitrates = 0;
 726         supp_ht = false;
 727         supp_vht = false;
 728         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 729                 struct ieee80211_supported_band *sband;
 730
 731                 sband = local->hw.wiphy->bands[band];
 732                 if (!sband)
 733                         continue;
 734                 if (!local->use_chanctx && !local->_oper_channel) {
 735                         /* init channel we're on */
 736                         local->hw.conf.channel =
 737                         local->_oper_channel = &sband->channels[0];
 738                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 739                 }
 740                 cfg80211_chandef_create(&local->monitor_chandef,
 741                                         &sband->channels[0],
 742                                         NL80211_CHAN_NO_HT);
 743                 channels += sband->n_channels;
 744
 745                 if (max_bitrates < sband->n_bitrates)
 746                         max_bitrates = sband->n_bitrates;
 747                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 748                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 749
 750                 if (sband->ht_cap.ht_supported)
 751                         local->rx_chains =
 752                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 753                                     local->rx_chains);
 754
 755                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 756         }
 757
 758         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 759                                       sizeof(void *) * channels, GFP_KERNEL);
 760         if (!local->int_scan_req)
 761                 return -ENOMEM;
 762
 763         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 764                 if (!local->hw.wiphy->bands[band])
 765                         continue;
 766                 local->int_scan_req->rates[band] = (u32) -1;
 767         }
 768
 769         /* if low-level driver supports AP, we also support VLAN */
 770         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 771                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 772                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 773         }
 774
 775         /* mac80211 always supports monitor */
 776         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 777         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 778
 779         /* mac80211 doesn't support more than one IBSS interface right now */
 780         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 781                 const struct ieee80211_iface_combination *c;
 782                 int j;
 783
 784                 c = &hw->wiphy->iface_combinations[i];
 785
 786                 for (j = 0; j < c->n_limits; j++)
 787                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 788                             c->limits[j].max > 1)
 789                                 return -EINVAL;
 790         }
 791
 792 #ifndef CONFIG_MAC80211_MESH
 793         /* mesh depends on Kconfig, but drivers should set it if they want */
 794         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 795 #endif
 796
 797         /* if the underlying driver supports mesh, mac80211 will (at least)
 798          * provide routing of mesh authentication frames to userspace */
 799         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 800                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 801
 802         /* mac80211 supports control port protocol changing */
 803         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 804
 805         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 806                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 807         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 808                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 809
 810         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 811              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 812              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 813
 814         /*
 815          * Calculate scan IE length -- we need this to alloc
 816          * memory and to subtract from the driver limit. It
 817          * includes the DS Params, (extended) supported rates, and HT
 818          * information -- SSID is the driver's responsibility.
 819          */
 820         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 821                 3 /* DS Params */;
 822         if (supp_ht)
 823                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 824
 825         if (supp_vht) {
 826                 local->scan_ies_len +=
 827                         2 + sizeof(struct ieee80211_vht_cap);
 828
 829                 /*
 830                  * (for now at least), drivers wanting to use VHT must
 831                  * support channel contexts, as they contain all the
 832                  * necessary VHT information and the global hw config
 833                  * doesn't (yet)
 834                  */
 835                 if (WARN_ON(!local->use_chanctx)) {
 836                         result = -EINVAL;
 837                         goto fail_wiphy_register;
 838                 }
 839         }
 840
 841         if (!local->ops->hw_scan) {
 842                 /* For hw_scan, driver needs to set these up. */
 843                 local->hw.wiphy->max_scan_ssids = 4;
 844                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 845         }
 846
 847         /*
 848          * If the driver supports any scan IEs, then assume the
 849          * limit includes the IEs mac80211 will add, otherwise
 850          * leave it at zero and let the driver sort it out; we
 851          * still pass our IEs to the driver but userspace will
 852          * not be allowed to in that case.
 853          */
 854         if (local->hw.wiphy->max_scan_ie_len)
 855                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 856
 857         /* Set up cipher suites unless driver already did */
 858         if (!local->hw.wiphy->cipher_suites) {
 859                 local->hw.wiphy->cipher_suites = cipher_suites;
 860                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 861                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 862                         local->hw.wiphy->n_cipher_suites--;
 863         }
 864         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 865                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 866                         local->hw.wiphy->cipher_suites += 2;
 867                         local->hw.wiphy->n_cipher_suites -= 2;
 868                 } else {
 869                         u32 *suites;
 870                         int r, w = 0;
 871
 872                         /* Filter out WEP */
 873
 874                         suites = kmemdup(
 875                                 local->hw.wiphy->cipher_suites,
 876                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 877                                 GFP_KERNEL);
 878                         if (!suites) {
 879                                 result = -ENOMEM;
 880                                 goto fail_wiphy_register;
 881                         }
 882                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 883                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 884                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 885                                     suite == WLAN_CIPHER_SUITE_WEP104)
 886                                         continue;
 887                                 suites[w++] = suite;
 888                         }
 889                         local->hw.wiphy->cipher_suites = suites;
 890                         local->hw.wiphy->n_cipher_suites = w;
 891                         local->wiphy_ciphers_allocated = true;
 892                 }
 893         }
 894
 895         if (!local->ops->remain_on_channel)
 896                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 897
 898         if (local->ops->sched_scan_start)
 899                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 900
 901         /* mac80211 based drivers don't support internal TDLS setup */
 902         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 903                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 904
 905         result = wiphy_register(local->hw.wiphy);
 906         if (result < 0)
 907                 goto fail_wiphy_register;
 908
 909         /*
 910          * We use the number of queues for feature tests (QoS, HT) internally
 911          * so restrict them appropriately.
 912          */
 913         if (hw->queues > IEEE80211_MAX_QUEUES)
 914                 hw->queues = IEEE80211_MAX_QUEUES;
 915
 916         local->workqueue =
 917                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 918         if (!local->workqueue) {
 919                 result = -ENOMEM;
 920                 goto fail_workqueue;
 921         }
 922
 923         /*
 924          * The hardware needs headroom for sending the frame,
 925          * and we need some headroom for passing the frame to monitor
 926          * interfaces, but never both at the same time.
 927          */
 928         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 929                                    IEEE80211_TX_STATUS_HEADROOM);
 930
 931         debugfs_hw_add(local);
 932
 933         /*
 934          * if the driver doesn't specify a max listen interval we
 935          * use 5 which should be a safe default
 936          */
 937         if (local->hw.max_listen_interval == 0)
 938                 local->hw.max_listen_interval = 5;
 939
 940         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 941
 942         local->dynamic_ps_forced_timeout = -1;
 943
 944         result = ieee80211_wep_init(local);
 945         if (result < 0)
 946                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 947                             result);
 948
 949         ieee80211_led_init(local);
 950
 951         rtnl_lock();
 952
 953         result = ieee80211_init_rate_ctrl_alg(local,
 954                                               hw->rate_control_algorithm);
 955         if (result < 0) {
 956                 wiphy_debug(local->hw.wiphy,
 957                             "Failed to initialize rate control algorithm\n");
 958                 goto fail_rate;
 959         }
 960
 961         /* add one default STA interface if supported */
 962         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 963                 result = ieee80211_if_add(local, "wlan%d", NULL,
 964                                           NL80211_IFTYPE_STATION, NULL);
 965                 if (result)
 966                         wiphy_warn(local->hw.wiphy,
 967                                    "Failed to add default virtual iface\n");
 968         }
 969
 970         rtnl_unlock();
 971
 972         local->network_latency_notifier.notifier_call =
 973                 ieee80211_max_network_latency;
 974         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 975                                      &local->network_latency_notifier);
 976         if (result) {
 977                 rtnl_lock();
 978                 goto fail_pm_qos;
 979         }
 980
 981 #ifdef CONFIG_INET
 982         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 983         result = register_inetaddr_notifier(&local->ifa_notifier);
 984         if (result)
 985                 goto fail_ifa;
 986 #endif
 987
 988         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 989                         local->hw.napi_weight);
 990
 991         return 0;
 992
 993 #ifdef CONFIG_INET
 994  fail_ifa:
 995         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 996                                &local->network_latency_notifier);
 997         rtnl_lock();
 998 #endif
 999  fail_pm_qos:
1000         ieee80211_led_exit(local);
1001         ieee80211_remove_interfaces(local);
1002  fail_rate:
1003         rtnl_unlock();
1004         ieee80211_wep_free(local);
1005         sta_info_stop(local);
1006         destroy_workqueue(local->workqueue);
1007  fail_workqueue:
1008         wiphy_unregister(local->hw.wiphy);
1009  fail_wiphy_register:
1010         if (local->wiphy_ciphers_allocated)
1011                 kfree(local->hw.wiphy->cipher_suites);
1012         kfree(local->int_scan_req);
1013         return result;
1014 }
1015 EXPORT_SYMBOL(ieee80211_register_hw);
1016
1017 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1018 {
1019         struct ieee80211_local *local = hw_to_local(hw);
1020
1021         tasklet_kill(&local->tx_pending_tasklet);
1022         tasklet_kill(&local->tasklet);
1023
1024         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1025                                &local->network_latency_notifier);
1026 #ifdef CONFIG_INET
1027         unregister_inetaddr_notifier(&local->ifa_notifier);
1028 #endif
1029
1030         rtnl_lock();
1031
1032         /*
1033          * At this point, interface list manipulations are fine
1034          * because the driver cannot be handing us frames any
1035          * more and the tasklet is killed.
1036          */
1037         ieee80211_remove_interfaces(local);
1038
1039         rtnl_unlock();
1040
1041         cancel_work_sync(&local->restart_work);
1042         cancel_work_sync(&local->reconfig_filter);
1043
1044         ieee80211_clear_tx_pending(local);
1045         rate_control_deinitialize(local);
1046
1047         if (skb_queue_len(&local->skb_queue) ||
1048             skb_queue_len(&local->skb_queue_unreliable))
1049                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1050         skb_queue_purge(&local->skb_queue);
1051         skb_queue_purge(&local->skb_queue_unreliable);
1052         skb_queue_purge(&local->rx_skb_queue);
1053
1054         destroy_workqueue(local->workqueue);
1055         wiphy_unregister(local->hw.wiphy);
1056         sta_info_stop(local);
1057         ieee80211_wep_free(local);
1058         ieee80211_led_exit(local);
1059         kfree(local->int_scan_req);
1060 }
1061 EXPORT_SYMBOL(ieee80211_unregister_hw);
1062
1063 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1064 {
1065         WARN_ONCE(1, "Have pending ack frames!\n");
1066         kfree_skb(p);
1067         return 0;
1068 }
1069
1070 void ieee80211_free_hw(struct ieee80211_hw *hw)
1071 {
1072         struct ieee80211_local *local = hw_to_local(hw);
1073
1074         mutex_destroy(&local->iflist_mtx);
1075         mutex_destroy(&local->mtx);
1076
1077         if (local->wiphy_ciphers_allocated)
1078                 kfree(local->hw.wiphy->cipher_suites);
1079
1080         idr_for_each(&local->ack_status_frames,
1081                      ieee80211_free_ack_frame, NULL);
1082         idr_destroy(&local->ack_status_frames);
1083
1084         wiphy_free(local->hw.wiphy);
1085 }
1086 EXPORT_SYMBOL(ieee80211_free_hw);
1087
1088 static int __init ieee80211_init(void)
1089 {
1090         struct sk_buff *skb;
1091         int ret;
1092
1093         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1094         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1095                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1096
1097         ret = rc80211_minstrel_init();
1098         if (ret)
1099                 return ret;
1100
1101         ret = rc80211_minstrel_ht_init();
1102         if (ret)
1103                 goto err_minstrel;
1104
1105         ret = rc80211_pid_init();
1106         if (ret)
1107                 goto err_pid;
1108
1109         ret = ieee80211_iface_init();
1110         if (ret)
1111                 goto err_netdev;
1112
1113         return 0;
1114  err_netdev:
1115         rc80211_pid_exit();
1116  err_pid:
1117         rc80211_minstrel_ht_exit();
1118  err_minstrel:
1119         rc80211_minstrel_exit();
1120
1121         return ret;
1122 }
1123
1124 static void __exit ieee80211_exit(void)
1125 {
1126         rc80211_pid_exit();
1127         rc80211_minstrel_ht_exit();
1128         rc80211_minstrel_exit();
1129
1130         if (mesh_allocated)
1131                 ieee80211s_stop();
1132
1133         ieee80211_iface_exit();
1134
1135         rcu_barrier();
1136 }
1137
1138
1139 subsys_initcall(ieee80211_init);
1140 module_exit(ieee80211_exit);
1141
1142 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1143 MODULE_LICENSE("GPL");