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 || local->scanning)
  51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  52
  53         if (local->fif_probe_req || local->probe_req_reg)
  54                 new_flags |= FIF_PROBE_REQ;
  55
  56         if (local->fif_fcsfail)
  57                 new_flags |= FIF_FCSFAIL;
  58
  59         if (local->fif_plcpfail)
  60                 new_flags |= FIF_PLCPFAIL;
  61
  62         if (local->fif_control)
  63                 new_flags |= FIF_CONTROL;
  64
  65         if (local->fif_other_bss)
  66                 new_flags |= FIF_OTHER_BSS;
  67
  68         if (local->fif_pspoll)
  69                 new_flags |= FIF_PSPOLL;
  70
  71         spin_lock_bh(&local->filter_lock);
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         mc = drv_prepare_multicast(local, &local->mc_list);
  75         spin_unlock_bh(&local->filter_lock);
  76
  77         /* be a bit nasty */
  78         new_flags |= (1<<31);
  79
  80         drv_configure_filter(local, changed_flags, &new_flags, mc);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 static void ieee80211_reconfig_filter(struct work_struct *work)
  88 {
  89         struct ieee80211_local *local =
  90                 container_of(work, struct ieee80211_local, reconfig_filter);
  91
  92         ieee80211_configure_filter(local);
  93 }
  94
  95 /*
  96  * Returns true if we are logically configured to be on
  97  * the operating channel AND the hardware-conf is currently
  98  * configured on the operating channel.  Compares channel-type
  99  * as well.
 100  */
 101 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
 102 {
 103         struct ieee80211_channel *chan;
 104         enum nl80211_channel_type channel_type;
 105
 106         /* This logic needs to match logic in ieee80211_hw_config */
 107         if (local->scan_channel) {
 108                 chan = local->scan_channel;
 109                 /* If scanning on oper channel, use whatever channel-type
 110                  * is currently in use.
 111                  */
 112                 if (chan == local->oper_channel)
 113                         channel_type = local->_oper_channel_type;
 114                 else
 115                         channel_type = NL80211_CHAN_NO_HT;
 116         } else if (local->tmp_channel) {
 117                 chan = local->tmp_channel;
 118                 channel_type = local->tmp_channel_type;
 119         } else {
 120                 chan = local->oper_channel;
 121                 channel_type = local->_oper_channel_type;
 122         }
 123
 124         if (chan != local->oper_channel ||
 125             channel_type != local->_oper_channel_type)
 126                 return false;
 127
 128         /* Check current hardware-config against oper_channel. */
 129         if (local->oper_channel != local->hw.conf.channel ||
 130             local->_oper_channel_type != local->hw.conf.channel_type)
 131                 return false;
 132
 133         return true;
 134 }
 135
 136 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 137 {
 138         struct ieee80211_channel *chan;
 139         int ret = 0;
 140         int power;
 141         enum nl80211_channel_type channel_type;
 142         u32 offchannel_flag;
 143
 144         might_sleep();
 145
 146         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
 147          * may need to change as well.
 148          */
 149         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 150         if (local->scan_channel) {
 151                 chan = local->scan_channel;
 152                 /* If scanning on oper channel, use whatever channel-type
 153                  * is currently in use.
 154                  */
 155                 if (chan == local->oper_channel)
 156                         channel_type = local->_oper_channel_type;
 157                 else
 158                         channel_type = NL80211_CHAN_NO_HT;
 159         } else if (local->tmp_channel) {
 160                 chan = local->tmp_channel;
 161                 channel_type = local->tmp_channel_type;
 162         } else {
 163                 chan = local->oper_channel;
 164                 channel_type = local->_oper_channel_type;
 165         }
 166
 167         if (chan != local->oper_channel ||
 168             channel_type != local->_oper_channel_type)
 169                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 170         else
 171                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 172
 173         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 174
 175         if (offchannel_flag || chan != local->hw.conf.channel ||
 176             channel_type != local->hw.conf.channel_type) {
 177                 local->hw.conf.channel = chan;
 178                 local->hw.conf.channel_type = channel_type;
 179                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 180         }
 181
 182         if (!conf_is_ht(&local->hw.conf)) {
 183                 /*
 184                  * mac80211.h documents that this is only valid
 185                  * when the channel is set to an HT type, and
 186                  * that otherwise STATIC is used.
 187                  */
 188                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 189         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 190                 local->hw.conf.smps_mode = local->smps_mode;
 191                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 192         }
 193
 194         if ((local->scanning & SCAN_SW_SCANNING) ||
 195             (local->scanning & SCAN_HW_SCANNING))
 196                 power = chan->max_power;
 197         else
 198                 power = local->power_constr_level ?
 199                         (chan->max_power - local->power_constr_level) :
 200                         chan->max_power;
 201
 202         if (local->user_power_level >= 0)
 203                 power = min(power, local->user_power_level);
 204
 205         if (local->hw.conf.power_level != power) {
 206                 changed |= IEEE80211_CONF_CHANGE_POWER;
 207                 local->hw.conf.power_level = power;
 208         }
 209
 210         if (changed && local->open_count) {
 211                 ret = drv_config(local, changed);
 212                 /*
 213                  * Goal:
 214                  * HW reconfiguration should never fail, the driver has told
 215                  * us what it can support so it should live up to that promise.
 216                  *
 217                  * Current status:
 218                  * rfkill is not integrated with mac80211 and a
 219                  * configuration command can thus fail if hardware rfkill
 220                  * is enabled
 221                  *
 222                  * FIXME: integrate rfkill with mac80211 and then add this
 223                  * WARN_ON() back
 224                  *
 225                  */
 226                 /* WARN_ON(ret); */
 227         }
 228
 229         return ret;
 230 }
 231
 232 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 233                                       u32 changed)
 234 {
 235         struct ieee80211_local *local = sdata->local;
 236         static const u8 zero[ETH_ALEN] = { 0 };
 237
 238         if (!changed)
 239                 return;
 240
 241         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 242                 /*
 243                  * While not associated, claim a BSSID of all-zeroes
 244                  * so that drivers don't do any weird things with the
 245                  * BSSID at that time.
 246                  */
 247                 if (sdata->vif.bss_conf.assoc)
 248                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 249                 else
 250                         sdata->vif.bss_conf.bssid = zero;
 251         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 252                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 253         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 254                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 255         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 256                 sdata->vif.bss_conf.bssid = NULL;
 257         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 258                 sdata->vif.bss_conf.bssid = zero;
 259         } else {
 260                 WARN_ON(1);
 261                 return;
 262         }
 263
 264         switch (sdata->vif.type) {
 265         case NL80211_IFTYPE_AP:
 266         case NL80211_IFTYPE_ADHOC:
 267         case NL80211_IFTYPE_WDS:
 268         case NL80211_IFTYPE_MESH_POINT:
 269                 break;
 270         default:
 271                 /* do not warn to simplify caller in scan.c */
 272                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 273                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 274                         return;
 275                 break;
 276         }
 277
 278         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 279                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 280                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 281                         sdata->vif.bss_conf.enable_beacon = false;
 282                 } else {
 283                         /*
 284                          * Beacon should be enabled, but AP mode must
 285                          * check whether there is a beacon configured.
 286                          */
 287                         switch (sdata->vif.type) {
 288                         case NL80211_IFTYPE_AP:
 289                                 sdata->vif.bss_conf.enable_beacon =
 290                                         !!sdata->u.ap.beacon;
 291                                 break;
 292                         case NL80211_IFTYPE_ADHOC:
 293                                 sdata->vif.bss_conf.enable_beacon =
 294                                         !!sdata->u.ibss.presp;
 295                                 break;
 296 #ifdef CONFIG_MAC80211_MESH
 297                         case NL80211_IFTYPE_MESH_POINT:
 298                                 sdata->vif.bss_conf.enable_beacon =
 299                                         !!sdata->u.mesh.mesh_id_len;
 300                                 break;
 301 #endif
 302                         default:
 303                                 /* not reached */
 304                                 WARN_ON(1);
 305                                 break;
 306                         }
 307                 }
 308         }
 309
 310         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 311 }
 312
 313 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 314 {
 315         sdata->vif.bss_conf.use_cts_prot = false;
 316         sdata->vif.bss_conf.use_short_preamble = false;
 317         sdata->vif.bss_conf.use_short_slot = false;
 318         return BSS_CHANGED_ERP_CTS_PROT |
 319                BSS_CHANGED_ERP_PREAMBLE |
 320                BSS_CHANGED_ERP_SLOT;
 321 }
 322
 323 static void ieee80211_tasklet_handler(unsigned long data)
 324 {
 325         struct ieee80211_local *local = (struct ieee80211_local *) data;
 326         struct sta_info *sta, *tmp;
 327         struct skb_eosp_msg_data *eosp_data;
 328         struct sk_buff *skb;
 329
 330         while ((skb = skb_dequeue(&local->skb_queue)) ||
 331                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 332                 switch (skb->pkt_type) {
 333                 case IEEE80211_RX_MSG:
 334                         /* Clear skb->pkt_type in order to not confuse kernel
 335                          * netstack. */
 336                         skb->pkt_type = 0;
 337                         ieee80211_rx(local_to_hw(local), skb);
 338                         break;
 339                 case IEEE80211_TX_STATUS_MSG:
 340                         skb->pkt_type = 0;
 341                         ieee80211_tx_status(local_to_hw(local), skb);
 342                         break;
 343                 case IEEE80211_EOSP_MSG:
 344                         eosp_data = (void *)skb->cb;
 345                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 346                                 /* skip wrong virtual interface */
 347                                 if (memcmp(eosp_data->iface,
 348                                            sta->sdata->vif.addr, ETH_ALEN))
 349                                         continue;
 350                                 clear_sta_flag(sta, WLAN_STA_SP);
 351                                 break;
 352                         }
 353                         dev_kfree_skb(skb);
 354                         break;
 355                 default:
 356                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 357                              skb->pkt_type);
 358                         dev_kfree_skb(skb);
 359                         break;
 360                 }
 361         }
 362 }
 363
 364 static void ieee80211_restart_work(struct work_struct *work)
 365 {
 366         struct ieee80211_local *local =
 367                 container_of(work, struct ieee80211_local, restart_work);
 368
 369         /* wait for scan work complete */
 370         flush_workqueue(local->workqueue);
 371
 372         mutex_lock(&local->mtx);
 373         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 374              local->sched_scanning,
 375                 "%s called with hardware scan in progress\n", __func__);
 376         mutex_unlock(&local->mtx);
 377
 378         rtnl_lock();
 379         ieee80211_scan_cancel(local);
 380         ieee80211_reconfig(local);
 381         rtnl_unlock();
 382 }
 383
 384 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 385 {
 386         struct ieee80211_local *local = hw_to_local(hw);
 387
 388         trace_api_restart_hw(local);
 389
 390         wiphy_info(hw->wiphy,
 391                    "Hardware restart was requested\n");
 392
 393         /* use this reason, ieee80211_reconfig will unblock it */
 394         ieee80211_stop_queues_by_reason(hw,
 395                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 396
 397         schedule_work(&local->restart_work);
 398 }
 399 EXPORT_SYMBOL(ieee80211_restart_hw);
 400
 401 static void ieee80211_recalc_smps_work(struct work_struct *work)
 402 {
 403         struct ieee80211_local *local =
 404                 container_of(work, struct ieee80211_local, recalc_smps);
 405
 406         mutex_lock(&local->iflist_mtx);
 407         ieee80211_recalc_smps(local);
 408         mutex_unlock(&local->iflist_mtx);
 409 }
 410
 411 #ifdef CONFIG_INET
 412 static int ieee80211_ifa_changed(struct notifier_block *nb,
 413                                  unsigned long data, void *arg)
 414 {
 415         struct in_ifaddr *ifa = arg;
 416         struct ieee80211_local *local =
 417                 container_of(nb, struct ieee80211_local,
 418                              ifa_notifier);
 419         struct net_device *ndev = ifa->ifa_dev->dev;
 420         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 421         struct in_device *idev;
 422         struct ieee80211_sub_if_data *sdata;
 423         struct ieee80211_bss_conf *bss_conf;
 424         struct ieee80211_if_managed *ifmgd;
 425         int c = 0;
 426
 427         /* Make sure it's our interface that got changed */
 428         if (!wdev)
 429                 return NOTIFY_DONE;
 430
 431         if (wdev->wiphy != local->hw.wiphy)
 432                 return NOTIFY_DONE;
 433
 434         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 435         bss_conf = &sdata->vif.bss_conf;
 436
 437         if (!ieee80211_sdata_running(sdata))
 438                 return NOTIFY_DONE;
 439
 440         /* ARP filtering is only supported in managed mode */
 441         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 442                 return NOTIFY_DONE;
 443
 444         idev = __in_dev_get_rtnl(sdata->dev);
 445         if (!idev)
 446                 return NOTIFY_DONE;
 447
 448         ifmgd = &sdata->u.mgd;
 449         mutex_lock(&ifmgd->mtx);
 450
 451         /* Copy the addresses to the bss_conf list */
 452         ifa = idev->ifa_list;
 453         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 454                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 455                 ifa = ifa->ifa_next;
 456                 c++;
 457         }
 458
 459         /* If not all addresses fit the list, disable filtering */
 460         if (ifa) {
 461                 sdata->arp_filter_state = false;
 462                 c = 0;
 463         } else {
 464                 sdata->arp_filter_state = true;
 465         }
 466         bss_conf->arp_addr_cnt = c;
 467
 468         /* Configure driver only if associated */
 469         if (ifmgd->associated) {
 470                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 471                 ieee80211_bss_info_change_notify(sdata,
 472                                                  BSS_CHANGED_ARP_FILTER);
 473         }
 474
 475         mutex_unlock(&ifmgd->mtx);
 476
 477         return NOTIFY_DONE;
 478 }
 479 #endif
 480
 481 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 482 {
 483         struct ieee80211_local *local =
 484                 container_of(napi, struct ieee80211_local, napi);
 485
 486         return local->ops->napi_poll(&local->hw, budget);
 487 }
 488
 489 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 490 {
 491         struct ieee80211_local *local = hw_to_local(hw);
 492
 493         napi_schedule(&local->napi);
 494 }
 495 EXPORT_SYMBOL(ieee80211_napi_schedule);
 496
 497 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 498 {
 499         struct ieee80211_local *local = hw_to_local(hw);
 500
 501         napi_complete(&local->napi);
 502 }
 503 EXPORT_SYMBOL(ieee80211_napi_complete);
 504
 505 /* There isn't a lot of sense in it, but you can transmit anything you like */
 506 static const struct ieee80211_txrx_stypes
 507 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 508         [NL80211_IFTYPE_ADHOC] = {
 509                 .tx = 0xffff,
 510                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 511         },
 512         [NL80211_IFTYPE_STATION] = {
 513                 .tx = 0xffff,
 514                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 515                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 516         },
 517         [NL80211_IFTYPE_AP] = {
 518                 .tx = 0xffff,
 519                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 520                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 521                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 522                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 523                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 524                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 525                         BIT(IEEE80211_STYPE_ACTION >> 4),
 526         },
 527         [NL80211_IFTYPE_AP_VLAN] = {
 528                 /* copy AP */
 529                 .tx = 0xffff,
 530                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 531                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 532                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 533                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 534                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 535                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 536                         BIT(IEEE80211_STYPE_ACTION >> 4),
 537         },
 538         [NL80211_IFTYPE_P2P_CLIENT] = {
 539                 .tx = 0xffff,
 540                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 541                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 542         },
 543         [NL80211_IFTYPE_P2P_GO] = {
 544                 .tx = 0xffff,
 545                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 546                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 547                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 548                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 549                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 550                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 551                         BIT(IEEE80211_STYPE_ACTION >> 4),
 552         },
 553         [NL80211_IFTYPE_MESH_POINT] = {
 554                 .tx = 0xffff,
 555                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 556                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 557                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 558         },
 559 };
 560
 561 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 562         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 563                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 564
 565         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 566                                 IEEE80211_HT_CAP_MAX_AMSDU |
 567                                 IEEE80211_HT_CAP_SGI_40),
 568         .mcs = {
 569                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 570                              0xff, 0xff, 0xff, 0xff, 0xff, },
 571         },
 572 };
 573
 574 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 575                                         const struct ieee80211_ops *ops)
 576 {
 577         struct ieee80211_local *local;
 578         int priv_size, i;
 579         struct wiphy *wiphy;
 580
 581         /* Ensure 32-byte alignment of our private data and hw private data.
 582          * We use the wiphy priv data for both our ieee80211_local and for
 583          * the driver's private data
 584          *
 585          * In memory it'll be like this:
 586          *
 587          * +-------------------------+
 588          * | struct wiphy           |
 589          * +-------------------------+
 590          * | struct ieee80211_local  |
 591          * +-------------------------+
 592          * | driver's private data   |
 593          * +-------------------------+
 594          *
 595          */
 596         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 597
 598         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 599
 600         if (!wiphy)
 601                 return NULL;
 602
 603         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 604
 605         wiphy->privid = mac80211_wiphy_privid;
 606
 607         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 608                         WIPHY_FLAG_4ADDR_AP |
 609                         WIPHY_FLAG_4ADDR_STATION |
 610                         WIPHY_FLAG_REPORTS_OBSS |
 611                         WIPHY_FLAG_OFFCHAN_TX |
 612                         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 613
 614         wiphy->features = NL80211_FEATURE_SK_TX_STATUS;
 615
 616         if (!ops->set_key)
 617                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 618
 619         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 620
 621         local = wiphy_priv(wiphy);
 622
 623         local->hw.wiphy = wiphy;
 624
 625         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 626
 627         BUG_ON(!ops->tx && !ops->tx_frags);
 628         BUG_ON(!ops->start);
 629         BUG_ON(!ops->stop);
 630         BUG_ON(!ops->config);
 631         BUG_ON(!ops->add_interface);
 632         BUG_ON(!ops->remove_interface);
 633         BUG_ON(!ops->configure_filter);
 634         local->ops = ops;
 635
 636         /* set up some defaults */
 637         local->hw.queues = 1;
 638         local->hw.max_rates = 1;
 639         local->hw.max_report_rates = 0;
 640         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 641         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 642         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 643         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 644         local->user_power_level = -1;
 645         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 646         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 647         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 648
 649         INIT_LIST_HEAD(&local->interfaces);
 650
 651         __hw_addr_init(&local->mc_list);
 652
 653         mutex_init(&local->iflist_mtx);
 654         mutex_init(&local->mtx);
 655
 656         mutex_init(&local->key_mtx);
 657         spin_lock_init(&local->filter_lock);
 658         spin_lock_init(&local->queue_stop_reason_lock);
 659
 660         /*
 661          * The rx_skb_queue is only accessed from tasklets,
 662          * but other SKB queues are used from within IRQ
 663          * context. Therefore, this one needs a different
 664          * locking class so our direct, non-irq-safe use of
 665          * the queue's lock doesn't throw lockdep warnings.
 666          */
 667         skb_queue_head_init_class(&local->rx_skb_queue,
 668                                   &ieee80211_rx_skb_queue_class);
 669
 670         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 671
 672         ieee80211_work_init(local);
 673
 674         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 675
 676         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 677         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 678         local->smps_mode = IEEE80211_SMPS_OFF;
 679
 680         INIT_WORK(&local->dynamic_ps_enable_work,
 681                   ieee80211_dynamic_ps_enable_work);
 682         INIT_WORK(&local->dynamic_ps_disable_work,
 683                   ieee80211_dynamic_ps_disable_work);
 684         setup_timer(&local->dynamic_ps_timer,
 685                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 686
 687         INIT_WORK(&local->sched_scan_stopped_work,
 688                   ieee80211_sched_scan_stopped_work);
 689
 690         spin_lock_init(&local->ack_status_lock);
 691         idr_init(&local->ack_status_frames);
 692         /* preallocate at least one entry */
 693         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 694
 695         sta_info_init(local);
 696
 697         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 698                 skb_queue_head_init(&local->pending[i]);
 699                 atomic_set(&local->agg_queue_stop[i], 0);
 700         }
 701         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 702                      (unsigned long)local);
 703
 704         tasklet_init(&local->tasklet,
 705                      ieee80211_tasklet_handler,
 706                      (unsigned long) local);
 707
 708         skb_queue_head_init(&local->skb_queue);
 709         skb_queue_head_init(&local->skb_queue_unreliable);
 710
 711         /* init dummy netdev for use w/ NAPI */
 712         init_dummy_netdev(&local->napi_dev);
 713
 714         ieee80211_led_names(local);
 715
 716         ieee80211_hw_roc_setup(local);
 717
 718         return local_to_hw(local);
 719 }
 720 EXPORT_SYMBOL(ieee80211_alloc_hw);
 721
 722 int ieee80211_register_hw(struct ieee80211_hw *hw)
 723 {
 724         struct ieee80211_local *local = hw_to_local(hw);
 725         int result, i;
 726         enum ieee80211_band band;
 727         int channels, max_bitrates;
 728         bool supp_ht;
 729         static const u32 cipher_suites[] = {
 730                 /* keep WEP first, it may be removed below */
 731                 WLAN_CIPHER_SUITE_WEP40,
 732                 WLAN_CIPHER_SUITE_WEP104,
 733                 WLAN_CIPHER_SUITE_TKIP,
 734                 WLAN_CIPHER_SUITE_CCMP,
 735
 736                 /* keep last -- depends on hw flags! */
 737                 WLAN_CIPHER_SUITE_AES_CMAC
 738         };
 739
 740         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
 741 #ifdef CONFIG_PM
 742             && (!local->ops->suspend || !local->ops->resume)
 743 #endif
 744             )
 745                 return -EINVAL;
 746
 747         if (hw->max_report_rates == 0)
 748                 hw->max_report_rates = hw->max_rates;
 749
 750         /*
 751          * generic code guarantees at least one band,
 752          * set this very early because much code assumes
 753          * that hw.conf.channel is assigned
 754          */
 755         channels = 0;
 756         max_bitrates = 0;
 757         supp_ht = false;
 758         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 759                 struct ieee80211_supported_band *sband;
 760
 761                 sband = local->hw.wiphy->bands[band];
 762                 if (!sband)
 763                         continue;
 764                 if (!local->oper_channel) {
 765                         /* init channel we're on */
 766                         local->hw.conf.channel =
 767                         local->oper_channel = &sband->channels[0];
 768                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 769                 }
 770                 channels += sband->n_channels;
 771
 772                 if (max_bitrates < sband->n_bitrates)
 773                         max_bitrates = sband->n_bitrates;
 774                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 775         }
 776
 777         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 778                                       sizeof(void *) * channels, GFP_KERNEL);
 779         if (!local->int_scan_req)
 780                 return -ENOMEM;
 781
 782         /* if low-level driver supports AP, we also support VLAN */
 783         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 784                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 785                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 786         }
 787
 788         /* mac80211 always supports monitor */
 789         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 790         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 791
 792         /*
 793          * mac80211 doesn't support more than 1 channel, and also not more
 794          * than one IBSS interface
 795          */
 796         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 797                 const struct ieee80211_iface_combination *c;
 798                 int j;
 799
 800                 c = &hw->wiphy->iface_combinations[i];
 801
 802                 if (c->num_different_channels > 1)
 803                         return -EINVAL;
 804
 805                 for (j = 0; j < c->n_limits; j++)
 806                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 807                             c->limits[j].max > 1)
 808                                 return -EINVAL;
 809         }
 810
 811 #ifndef CONFIG_MAC80211_MESH
 812         /* mesh depends on Kconfig, but drivers should set it if they want */
 813         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 814 #endif
 815
 816         /* if the underlying driver supports mesh, mac80211 will (at least)
 817          * provide routing of mesh authentication frames to userspace */
 818         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 819                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 820
 821         /* mac80211 supports control port protocol changing */
 822         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 823
 824         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 825                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 826         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 827                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 828
 829         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 830              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 831              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 832
 833         /*
 834          * Calculate scan IE length -- we need this to alloc
 835          * memory and to subtract from the driver limit. It
 836          * includes the DS Params, (extended) supported rates, and HT
 837          * information -- SSID is the driver's responsibility.
 838          */
 839         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 840                 3 /* DS Params */;
 841         if (supp_ht)
 842                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 843
 844         if (!local->ops->hw_scan) {
 845                 /* For hw_scan, driver needs to set these up. */
 846                 local->hw.wiphy->max_scan_ssids = 4;
 847                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 848         }
 849
 850         /*
 851          * If the driver supports any scan IEs, then assume the
 852          * limit includes the IEs mac80211 will add, otherwise
 853          * leave it at zero and let the driver sort it out; we
 854          * still pass our IEs to the driver but userspace will
 855          * not be allowed to in that case.
 856          */
 857         if (local->hw.wiphy->max_scan_ie_len)
 858                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 859
 860         /* Set up cipher suites unless driver already did */
 861         if (!local->hw.wiphy->cipher_suites) {
 862                 local->hw.wiphy->cipher_suites = cipher_suites;
 863                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 864                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 865                         local->hw.wiphy->n_cipher_suites--;
 866         }
 867         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 868                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 869                         local->hw.wiphy->cipher_suites += 2;
 870                         local->hw.wiphy->n_cipher_suites -= 2;
 871                 } else {
 872                         u32 *suites;
 873                         int r, w = 0;
 874
 875                         /* Filter out WEP */
 876
 877                         suites = kmemdup(
 878                                 local->hw.wiphy->cipher_suites,
 879                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 880                                 GFP_KERNEL);
 881                         if (!suites)
 882                                 return -ENOMEM;
 883                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 884                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 885                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 886                                     suite == WLAN_CIPHER_SUITE_WEP104)
 887                                         continue;
 888                                 suites[w++] = suite;
 889                         }
 890                         local->hw.wiphy->cipher_suites = suites;
 891                         local->hw.wiphy->n_cipher_suites = w;
 892                         local->wiphy_ciphers_allocated = true;
 893                 }
 894         }
 895
 896         if (!local->ops->remain_on_channel)
 897                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 898
 899         if (local->ops->sched_scan_start)
 900                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 901
 902         /* mac80211 based drivers don't support internal TDLS setup */
 903         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 904                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 905
 906         result = wiphy_register(local->hw.wiphy);
 907         if (result < 0)
 908                 goto fail_wiphy_register;
 909
 910         /*
 911          * We use the number of queues for feature tests (QoS, HT) internally
 912          * so restrict them appropriately.
 913          */
 914         if (hw->queues > IEEE80211_MAX_QUEUES)
 915                 hw->queues = IEEE80211_MAX_QUEUES;
 916
 917         local->workqueue =
 918                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 919         if (!local->workqueue) {
 920                 result = -ENOMEM;
 921                 goto fail_workqueue;
 922         }
 923
 924         /*
 925          * The hardware needs headroom for sending the frame,
 926          * and we need some headroom for passing the frame to monitor
 927          * interfaces, but never both at the same time.
 928          */
 929         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 930                                    IEEE80211_TX_STATUS_HEADROOM);
 931
 932         debugfs_hw_add(local);
 933
 934         /*
 935          * if the driver doesn't specify a max listen interval we
 936          * use 5 which should be a safe default
 937          */
 938         if (local->hw.max_listen_interval == 0)
 939                 local->hw.max_listen_interval = 5;
 940
 941         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 942
 943         local->dynamic_ps_forced_timeout = -1;
 944
 945         result = ieee80211_wep_init(local);
 946         if (result < 0)
 947                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 948                             result);
 949
 950         rtnl_lock();
 951
 952         result = ieee80211_init_rate_ctrl_alg(local,
 953                                               hw->rate_control_algorithm);
 954         if (result < 0) {
 955                 wiphy_debug(local->hw.wiphy,
 956                             "Failed to initialize rate control algorithm\n");
 957                 goto fail_rate;
 958         }
 959
 960         /* add one default STA interface if supported */
 961         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 962                 result = ieee80211_if_add(local, "wlan%d", NULL,
 963                                           NL80211_IFTYPE_STATION, NULL);
 964                 if (result)
 965                         wiphy_warn(local->hw.wiphy,
 966                                    "Failed to add default virtual iface\n");
 967         }
 968
 969         rtnl_unlock();
 970
 971         ieee80211_led_init(local);
 972
 973         local->network_latency_notifier.notifier_call =
 974                 ieee80211_max_network_latency;
 975         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 976                                      &local->network_latency_notifier);
 977         if (result) {
 978                 rtnl_lock();
 979                 goto fail_pm_qos;
 980         }
 981
 982 #ifdef CONFIG_INET
 983         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 984         result = register_inetaddr_notifier(&local->ifa_notifier);
 985         if (result)
 986                 goto fail_ifa;
 987 #endif
 988
 989         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 990                         local->hw.napi_weight);
 991
 992         return 0;
 993
 994 #ifdef CONFIG_INET
 995  fail_ifa:
 996         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 997                                &local->network_latency_notifier);
 998         rtnl_lock();
 999 #endif
1000  fail_pm_qos:
1001         ieee80211_led_exit(local);
1002         ieee80211_remove_interfaces(local);
1003  fail_rate:
1004         rtnl_unlock();
1005         ieee80211_wep_free(local);
1006         sta_info_stop(local);
1007         destroy_workqueue(local->workqueue);
1008  fail_workqueue:
1009         wiphy_unregister(local->hw.wiphy);
1010  fail_wiphy_register:
1011         if (local->wiphy_ciphers_allocated)
1012                 kfree(local->hw.wiphy->cipher_suites);
1013         kfree(local->int_scan_req);
1014         return result;
1015 }
1016 EXPORT_SYMBOL(ieee80211_register_hw);
1017
1018 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1019 {
1020         struct ieee80211_local *local = hw_to_local(hw);
1021
1022         tasklet_kill(&local->tx_pending_tasklet);
1023         tasklet_kill(&local->tasklet);
1024
1025         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1026                                &local->network_latency_notifier);
1027 #ifdef CONFIG_INET
1028         unregister_inetaddr_notifier(&local->ifa_notifier);
1029 #endif
1030
1031         rtnl_lock();
1032
1033         /*
1034          * At this point, interface list manipulations are fine
1035          * because the driver cannot be handing us frames any
1036          * more and the tasklet is killed.
1037          */
1038         ieee80211_remove_interfaces(local);
1039
1040         rtnl_unlock();
1041
1042         /*
1043          * Now all work items will be gone, but the
1044          * timer might still be armed, so delete it
1045          */
1046         del_timer_sync(&local->work_timer);
1047
1048         cancel_work_sync(&local->restart_work);
1049         cancel_work_sync(&local->reconfig_filter);
1050
1051         ieee80211_clear_tx_pending(local);
1052         rate_control_deinitialize(local);
1053
1054         if (skb_queue_len(&local->skb_queue) ||
1055             skb_queue_len(&local->skb_queue_unreliable))
1056                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1057         skb_queue_purge(&local->skb_queue);
1058         skb_queue_purge(&local->skb_queue_unreliable);
1059         skb_queue_purge(&local->rx_skb_queue);
1060
1061         destroy_workqueue(local->workqueue);
1062         wiphy_unregister(local->hw.wiphy);
1063         sta_info_stop(local);
1064         ieee80211_wep_free(local);
1065         ieee80211_led_exit(local);
1066         kfree(local->int_scan_req);
1067 }
1068 EXPORT_SYMBOL(ieee80211_unregister_hw);
1069
1070 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1071 {
1072         WARN_ONCE(1, "Have pending ack frames!\n");
1073         kfree_skb(p);
1074         return 0;
1075 }
1076
1077 void ieee80211_free_hw(struct ieee80211_hw *hw)
1078 {
1079         struct ieee80211_local *local = hw_to_local(hw);
1080
1081         mutex_destroy(&local->iflist_mtx);
1082         mutex_destroy(&local->mtx);
1083
1084         if (local->wiphy_ciphers_allocated)
1085                 kfree(local->hw.wiphy->cipher_suites);
1086
1087         idr_for_each(&local->ack_status_frames,
1088                      ieee80211_free_ack_frame, NULL);
1089         idr_destroy(&local->ack_status_frames);
1090
1091         wiphy_free(local->hw.wiphy);
1092 }
1093 EXPORT_SYMBOL(ieee80211_free_hw);
1094
1095 static int __init ieee80211_init(void)
1096 {
1097         struct sk_buff *skb;
1098         int ret;
1099
1100         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1101         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1102                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1103
1104         ret = rc80211_minstrel_init();
1105         if (ret)
1106                 return ret;
1107
1108         ret = rc80211_minstrel_ht_init();
1109         if (ret)
1110                 goto err_minstrel;
1111
1112         ret = rc80211_pid_init();
1113         if (ret)
1114                 goto err_pid;
1115
1116         ret = ieee80211_iface_init();
1117         if (ret)
1118                 goto err_netdev;
1119
1120         return 0;
1121  err_netdev:
1122         rc80211_pid_exit();
1123  err_pid:
1124         rc80211_minstrel_ht_exit();
1125  err_minstrel:
1126         rc80211_minstrel_exit();
1127
1128         return ret;
1129 }
1130
1131 static void __exit ieee80211_exit(void)
1132 {
1133         rc80211_pid_exit();
1134         rc80211_minstrel_ht_exit();
1135         rc80211_minstrel_exit();
1136
1137         if (mesh_allocated)
1138                 ieee80211s_stop();
1139
1140         ieee80211_iface_exit();
1141
1142         rcu_barrier();
1143 }
1144
1145
1146 subsys_initcall(ieee80211_init);
1147 module_exit(ieee80211_exit);
1148
1149 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1150 MODULE_LICENSE("GPL");