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