net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 #define TMR_RUNNING_TIMER       0
  51 #define TMR_RUNNING_CHANSW      1
  52
  53 /*
  54  * All cfg80211 functions have to be called outside a locked
  55  * section so that they can acquire a lock themselves... This
  56  * is much simpler than queuing up things in cfg80211, but we
  57  * do need some indirection for that here.
  58  */
  59 enum rx_mgmt_action {
  60         /* no action required */
  61         RX_MGMT_NONE,
  62
  63         /* caller must call cfg80211_send_rx_auth() */
  64         RX_MGMT_CFG80211_AUTH,
  65
  66         /* caller must call cfg80211_send_rx_assoc() */
  67         RX_MGMT_CFG80211_ASSOC,
  68
  69         /* caller must call cfg80211_send_deauth() */
  70         RX_MGMT_CFG80211_DEAUTH,
  71
  72         /* caller must call cfg80211_send_disassoc() */
  73         RX_MGMT_CFG80211_DISASSOC,
  74
  75         /* caller must tell cfg80211 about internal error */
  76         RX_MGMT_CFG80211_ASSOC_ERROR,
  77 };
  78
  79 /* utils */
  80 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  81 {
  82         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  83 }
  84
  85 /*
  86  * We can have multiple work items (and connection probing)
  87  * scheduling this timer, but we need to take care to only
  88  * reschedule it when it should fire _earlier_ than it was
  89  * asked for before, or if it's not pending right now. This
  90  * function ensures that. Note that it then is required to
  91  * run this function for all timeouts after the first one
  92  * has happened -- the work that runs from this timer will
  93  * do that.
  94  */
  95 static void run_again(struct ieee80211_if_managed *ifmgd,
  96                              unsigned long timeout)
  97 {
  98         ASSERT_MGD_MTX(ifmgd);
  99
 100         if (!timer_pending(&ifmgd->timer) ||
 101             time_before(timeout, ifmgd->timer.expires))
 102                 mod_timer(&ifmgd->timer, timeout);
 103 }
 104
 105 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 106 {
 107         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 108                 return;
 109
 110         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 111                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 112 }
 113
 114 static int ecw2cw(int ecw)
 115 {
 116         return (1 << ecw) - 1;
 117 }
 118
 119 /*
 120  * ieee80211_enable_ht should be called only after the operating band
 121  * has been determined as ht configuration depends on the hw's
 122  * HT abilities for a specific band.
 123  */
 124 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 125                                struct ieee80211_ht_info *hti,
 126                                const u8 *bssid, u16 ap_ht_cap_flags)
 127 {
 128         struct ieee80211_local *local = sdata->local;
 129         struct ieee80211_supported_band *sband;
 130         struct sta_info *sta;
 131         u32 changed = 0;
 132         u16 ht_opmode;
 133         bool enable_ht = true, ht_changed;
 134         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 135
 136         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 137
 138         /* HT is not supported */
 139         if (!sband->ht_cap.ht_supported)
 140                 enable_ht = false;
 141
 142         /* check that channel matches the right operating channel */
 143         if (local->hw.conf.channel->center_freq !=
 144             ieee80211_channel_to_frequency(hti->control_chan))
 145                 enable_ht = false;
 146
 147         if (enable_ht) {
 148                 channel_type = NL80211_CHAN_HT20;
 149
 150                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 151                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 152                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 153                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 154                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 155                                 if (!(local->hw.conf.channel->flags &
 156                                     IEEE80211_CHAN_NO_HT40PLUS))
 157                                         channel_type = NL80211_CHAN_HT40PLUS;
 158                                 break;
 159                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 160                                 if (!(local->hw.conf.channel->flags &
 161                                     IEEE80211_CHAN_NO_HT40MINUS))
 162                                         channel_type = NL80211_CHAN_HT40MINUS;
 163                                 break;
 164                         }
 165                 }
 166         }
 167
 168         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 169                      channel_type != local->hw.conf.channel_type;
 170
 171         local->oper_channel_type = channel_type;
 172
 173         if (ht_changed) {
 174                 /* channel_type change automatically detected */
 175                 ieee80211_hw_config(local, 0);
 176
 177                 rcu_read_lock();
 178                 sta = sta_info_get(sdata, bssid);
 179                 if (sta)
 180                         rate_control_rate_update(local, sband, sta,
 181                                                  IEEE80211_RC_HT_CHANGED,
 182                                                  local->oper_channel_type);
 183                 rcu_read_unlock();
 184         }
 185
 186         /* disable HT */
 187         if (!enable_ht)
 188                 return 0;
 189
 190         ht_opmode = le16_to_cpu(hti->operation_mode);
 191
 192         /* if bss configuration changed store the new one */
 193         if (!sdata->ht_opmode_valid ||
 194             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 195                 changed |= BSS_CHANGED_HT;
 196                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 197                 sdata->ht_opmode_valid = true;
 198         }
 199
 200         return changed;
 201 }
 202
 203 /* frame sending functions */
 204
 205 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 206                                            const u8 *bssid, u16 stype, u16 reason,
 207                                            void *cookie)
 208 {
 209         struct ieee80211_local *local = sdata->local;
 210         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 211         struct sk_buff *skb;
 212         struct ieee80211_mgmt *mgmt;
 213
 214         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 215         if (!skb) {
 216                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 217                        "deauth/disassoc frame\n", sdata->name);
 218                 return;
 219         }
 220         skb_reserve(skb, local->hw.extra_tx_headroom);
 221
 222         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 223         memset(mgmt, 0, 24);
 224         memcpy(mgmt->da, bssid, ETH_ALEN);
 225         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 226         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 227         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 228         skb_put(skb, 2);
 229         /* u.deauth.reason_code == u.disassoc.reason_code */
 230         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 231
 232         if (stype == IEEE80211_STYPE_DEAUTH)
 233                 if (cookie)
 234                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 235                 else
 236                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 237         else
 238                 if (cookie)
 239                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 240                 else
 241                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 242         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 243                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 244         ieee80211_tx_skb(sdata, skb);
 245 }
 246
 247 void ieee80211_send_pspoll(struct ieee80211_local *local,
 248                            struct ieee80211_sub_if_data *sdata)
 249 {
 250         struct ieee80211_pspoll *pspoll;
 251         struct sk_buff *skb;
 252
 253         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 254         if (!skb)
 255                 return;
 256
 257         pspoll = (struct ieee80211_pspoll *) skb->data;
 258         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 259
 260         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 261         ieee80211_tx_skb(sdata, skb);
 262 }
 263
 264 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 265                              struct ieee80211_sub_if_data *sdata,
 266                              int powersave)
 267 {
 268         struct sk_buff *skb;
 269         struct ieee80211_hdr_3addr *nullfunc;
 270
 271         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 272         if (!skb)
 273                 return;
 274
 275         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 276         if (powersave)
 277                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 278
 279         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 280         ieee80211_tx_skb(sdata, skb);
 281 }
 282
 283 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 284                                           struct ieee80211_sub_if_data *sdata)
 285 {
 286         struct sk_buff *skb;
 287         struct ieee80211_hdr *nullfunc;
 288         __le16 fc;
 289
 290         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 291                 return;
 292
 293         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 294         if (!skb) {
 295                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 296                        "nullfunc frame\n", sdata->name);
 297                 return;
 298         }
 299         skb_reserve(skb, local->hw.extra_tx_headroom);
 300
 301         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 302         memset(nullfunc, 0, 30);
 303         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 304                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 305         nullfunc->frame_control = fc;
 306         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 307         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 308         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 309         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 310
 311         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 312         ieee80211_tx_skb(sdata, skb);
 313 }
 314
 315 /* spectrum management related things */
 316 static void ieee80211_chswitch_work(struct work_struct *work)
 317 {
 318         struct ieee80211_sub_if_data *sdata =
 319                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 320         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 321
 322         if (!ieee80211_sdata_running(sdata))
 323                 return;
 324
 325         mutex_lock(&ifmgd->mtx);
 326         if (!ifmgd->associated)
 327                 goto out;
 328
 329         sdata->local->oper_channel = sdata->local->csa_channel;
 330         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 331
 332         /* XXX: shouldn't really modify cfg80211-owned data! */
 333         ifmgd->associated->channel = sdata->local->oper_channel;
 334
 335         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 336                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 337  out:
 338         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 339         mutex_unlock(&ifmgd->mtx);
 340 }
 341
 342 static void ieee80211_chswitch_timer(unsigned long data)
 343 {
 344         struct ieee80211_sub_if_data *sdata =
 345                 (struct ieee80211_sub_if_data *) data;
 346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 347
 348         if (sdata->local->quiescing) {
 349                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 350                 return;
 351         }
 352
 353         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 354 }
 355
 356 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 357                                       struct ieee80211_channel_sw_ie *sw_elem,
 358                                       struct ieee80211_bss *bss)
 359 {
 360         struct cfg80211_bss *cbss =
 361                 container_of((void *)bss, struct cfg80211_bss, priv);
 362         struct ieee80211_channel *new_ch;
 363         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 364         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 365
 366         ASSERT_MGD_MTX(ifmgd);
 367
 368         if (!ifmgd->associated)
 369                 return;
 370
 371         if (sdata->local->scanning)
 372                 return;
 373
 374         /* Disregard subsequent beacons if we are already running a timer
 375            processing a CSA */
 376
 377         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 378                 return;
 379
 380         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 381         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 382                 return;
 383
 384         sdata->local->csa_channel = new_ch;
 385
 386         if (sw_elem->count <= 1) {
 387                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 388         } else {
 389                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 390                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 391                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 392                 mod_timer(&ifmgd->chswitch_timer,
 393                           jiffies +
 394                           msecs_to_jiffies(sw_elem->count *
 395                                            cbss->beacon_interval));
 396         }
 397 }
 398
 399 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 400                                         u16 capab_info, u8 *pwr_constr_elem,
 401                                         u8 pwr_constr_elem_len)
 402 {
 403         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 404
 405         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 406                 return;
 407
 408         /* Power constraint IE length should be 1 octet */
 409         if (pwr_constr_elem_len != 1)
 410                 return;
 411
 412         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 413             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 414                 sdata->local->power_constr_level = *pwr_constr_elem;
 415                 ieee80211_hw_config(sdata->local, 0);
 416         }
 417 }
 418
 419 /* powersave */
 420 static void ieee80211_enable_ps(struct ieee80211_local *local,
 421                                 struct ieee80211_sub_if_data *sdata)
 422 {
 423         struct ieee80211_conf *conf = &local->hw.conf;
 424
 425         /*
 426          * If we are scanning right now then the parameters will
 427          * take effect when scan finishes.
 428          */
 429         if (local->scanning)
 430                 return;
 431
 432         if (conf->dynamic_ps_timeout > 0 &&
 433             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 434                 mod_timer(&local->dynamic_ps_timer, jiffies +
 435                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 436         } else {
 437                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 438                         ieee80211_send_nullfunc(local, sdata, 1);
 439
 440                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 441                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 442                         return;
 443
 444                 conf->flags |= IEEE80211_CONF_PS;
 445                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 446         }
 447 }
 448
 449 static void ieee80211_change_ps(struct ieee80211_local *local)
 450 {
 451         struct ieee80211_conf *conf = &local->hw.conf;
 452
 453         if (local->ps_sdata) {
 454                 ieee80211_enable_ps(local, local->ps_sdata);
 455         } else if (conf->flags & IEEE80211_CONF_PS) {
 456                 conf->flags &= ~IEEE80211_CONF_PS;
 457                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 458                 del_timer_sync(&local->dynamic_ps_timer);
 459                 cancel_work_sync(&local->dynamic_ps_enable_work);
 460         }
 461 }
 462
 463 /* need to hold RTNL or interface lock */
 464 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 465 {
 466         struct ieee80211_sub_if_data *sdata, *found = NULL;
 467         int count = 0;
 468
 469         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 470                 local->ps_sdata = NULL;
 471                 return;
 472         }
 473
 474         if (!list_empty(&local->work_list)) {
 475                 local->ps_sdata = NULL;
 476                 goto change;
 477         }
 478
 479         list_for_each_entry(sdata, &local->interfaces, list) {
 480                 if (!ieee80211_sdata_running(sdata))
 481                         continue;
 482                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 483                         continue;
 484                 found = sdata;
 485                 count++;
 486         }
 487
 488         if (count == 1 && found->u.mgd.powersave &&
 489             found->u.mgd.associated &&
 490             found->u.mgd.associated->beacon_ies &&
 491             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 492                                     IEEE80211_STA_CONNECTION_POLL))) {
 493                 s32 beaconint_us;
 494
 495                 if (latency < 0)
 496                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 497
 498                 beaconint_us = ieee80211_tu_to_usec(
 499                                         found->vif.bss_conf.beacon_int);
 500
 501                 if (beaconint_us > latency) {
 502                         local->ps_sdata = NULL;
 503                 } else {
 504                         struct ieee80211_bss *bss;
 505                         int maxslp = 1;
 506                         u8 dtimper;
 507
 508                         bss = (void *)found->u.mgd.associated->priv;
 509                         dtimper = bss->dtim_period;
 510
 511                         /* If the TIM IE is invalid, pretend the value is 1 */
 512                         if (!dtimper)
 513                                 dtimper = 1;
 514                         else if (dtimper > 1)
 515                                 maxslp = min_t(int, dtimper,
 516                                                     latency / beaconint_us);
 517
 518                         local->hw.conf.max_sleep_period = maxslp;
 519                         local->hw.conf.ps_dtim_period = dtimper;
 520                         local->ps_sdata = found;
 521                 }
 522         } else {
 523                 local->ps_sdata = NULL;
 524         }
 525
 526  change:
 527         ieee80211_change_ps(local);
 528 }
 529
 530 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 531 {
 532         struct ieee80211_local *local =
 533                 container_of(work, struct ieee80211_local,
 534                              dynamic_ps_disable_work);
 535
 536         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 537                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 538                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 539         }
 540
 541         ieee80211_wake_queues_by_reason(&local->hw,
 542                                         IEEE80211_QUEUE_STOP_REASON_PS);
 543 }
 544
 545 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 546 {
 547         struct ieee80211_local *local =
 548                 container_of(work, struct ieee80211_local,
 549                              dynamic_ps_enable_work);
 550         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 551         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 552
 553         /* can only happen when PS was just disabled anyway */
 554         if (!sdata)
 555                 return;
 556
 557         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 558                 return;
 559
 560         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 561             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 562                 ieee80211_send_nullfunc(local, sdata, 1);
 563
 564         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 565               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 566             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 567                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 568                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 569                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 570         }
 571 }
 572
 573 void ieee80211_dynamic_ps_timer(unsigned long data)
 574 {
 575         struct ieee80211_local *local = (void *) data;
 576
 577         if (local->quiescing || local->suspended)
 578                 return;
 579
 580         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 581 }
 582
 583 /* MLME */
 584 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 585                                      struct ieee80211_if_managed *ifmgd,
 586                                      u8 *wmm_param, size_t wmm_param_len)
 587 {
 588         struct ieee80211_tx_queue_params params;
 589         size_t left;
 590         int count;
 591         u8 *pos, uapsd_queues = 0;
 592
 593         if (local->hw.queues < 4)
 594                 return;
 595
 596         if (!wmm_param)
 597                 return;
 598
 599         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 600                 return;
 601
 602         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 603                 uapsd_queues = local->uapsd_queues;
 604
 605         count = wmm_param[6] & 0x0f;
 606         if (count == ifmgd->wmm_last_param_set)
 607                 return;
 608         ifmgd->wmm_last_param_set = count;
 609
 610         pos = wmm_param + 8;
 611         left = wmm_param_len - 8;
 612
 613         memset(&params, 0, sizeof(params));
 614
 615         local->wmm_acm = 0;
 616         for (; left >= 4; left -= 4, pos += 4) {
 617                 int aci = (pos[0] >> 5) & 0x03;
 618                 int acm = (pos[0] >> 4) & 0x01;
 619                 bool uapsd = false;
 620                 int queue;
 621
 622                 switch (aci) {
 623                 case 1: /* AC_BK */
 624                         queue = 3;
 625                         if (acm)
 626                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 627                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 628                                 uapsd = true;
 629                         break;
 630                 case 2: /* AC_VI */
 631                         queue = 1;
 632                         if (acm)
 633                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 634                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 635                                 uapsd = true;
 636                         break;
 637                 case 3: /* AC_VO */
 638                         queue = 0;
 639                         if (acm)
 640                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 641                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 642                                 uapsd = true;
 643                         break;
 644                 case 0: /* AC_BE */
 645                 default:
 646                         queue = 2;
 647                         if (acm)
 648                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 649                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 650                                 uapsd = true;
 651                         break;
 652                 }
 653
 654                 params.aifs = pos[0] & 0x0f;
 655                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 656                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 657                 params.txop = get_unaligned_le16(pos + 2);
 658                 params.uapsd = uapsd;
 659
 660 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 661                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 662                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 663                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 664                        params.aifs, params.cw_min, params.cw_max, params.txop,
 665                        params.uapsd);
 666 #endif
 667                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 668                         printk(KERN_DEBUG "%s: failed to set TX queue "
 669                                "parameters for queue %d\n",
 670                                wiphy_name(local->hw.wiphy), queue);
 671         }
 672 }
 673
 674 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 675                                            u16 capab, bool erp_valid, u8 erp)
 676 {
 677         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 678         u32 changed = 0;
 679         bool use_protection;
 680         bool use_short_preamble;
 681         bool use_short_slot;
 682
 683         if (erp_valid) {
 684                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 685                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 686         } else {
 687                 use_protection = false;
 688                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 689         }
 690
 691         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 692         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 693                 use_short_slot = true;
 694
 695         if (use_protection != bss_conf->use_cts_prot) {
 696                 bss_conf->use_cts_prot = use_protection;
 697                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 698         }
 699
 700         if (use_short_preamble != bss_conf->use_short_preamble) {
 701                 bss_conf->use_short_preamble = use_short_preamble;
 702                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 703         }
 704
 705         if (use_short_slot != bss_conf->use_short_slot) {
 706                 bss_conf->use_short_slot = use_short_slot;
 707                 changed |= BSS_CHANGED_ERP_SLOT;
 708         }
 709
 710         return changed;
 711 }
 712
 713 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 714                                      struct cfg80211_bss *cbss,
 715                                      u32 bss_info_changed)
 716 {
 717         struct ieee80211_bss *bss = (void *)cbss->priv;
 718         struct ieee80211_local *local = sdata->local;
 719
 720         bss_info_changed |= BSS_CHANGED_ASSOC;
 721         /* set timing information */
 722         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 723         sdata->vif.bss_conf.timestamp = cbss->tsf;
 724
 725         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 726         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 727                 cbss->capability, bss->has_erp_value, bss->erp_value);
 728
 729         sdata->u.mgd.associated = cbss;
 730         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 731
 732         /* just to be sure */
 733         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 734                                 IEEE80211_STA_BEACON_POLL);
 735
 736         /*
 737          * Always handle WMM once after association regardless
 738          * of the first value the AP uses. Setting -1 here has
 739          * that effect because the AP values is an unsigned
 740          * 4-bit value.
 741          */
 742         sdata->u.mgd.wmm_last_param_set = -1;
 743
 744         ieee80211_led_assoc(local, 1);
 745
 746         sdata->vif.bss_conf.assoc = 1;
 747         /*
 748          * For now just always ask the driver to update the basic rateset
 749          * when we have associated, we aren't checking whether it actually
 750          * changed or not.
 751          */
 752         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 753
 754         /* And the BSSID changed - we're associated now */
 755         bss_info_changed |= BSS_CHANGED_BSSID;
 756
 757         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 758
 759         mutex_lock(&local->iflist_mtx);
 760         ieee80211_recalc_ps(local, -1);
 761         ieee80211_recalc_smps(local, sdata);
 762         mutex_unlock(&local->iflist_mtx);
 763
 764         netif_tx_start_all_queues(sdata->dev);
 765         netif_carrier_on(sdata->dev);
 766 }
 767
 768 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 769 {
 770         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 771         struct ieee80211_local *local = sdata->local;
 772         struct sta_info *sta;
 773         u32 changed = 0, config_changed = 0;
 774         u8 bssid[ETH_ALEN];
 775
 776         ASSERT_MGD_MTX(ifmgd);
 777
 778         if (WARN_ON(!ifmgd->associated))
 779                 return;
 780
 781         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 782
 783         ifmgd->associated = NULL;
 784         memset(ifmgd->bssid, 0, ETH_ALEN);
 785
 786         /*
 787          * we need to commit the associated = NULL change because the
 788          * scan code uses that to determine whether this iface should
 789          * go to/wake up from powersave or not -- and could otherwise
 790          * wake the queues erroneously.
 791          */
 792         smp_mb();
 793
 794         /*
 795          * Thus, we can only afterwards stop the queues -- to account
 796          * for the case where another CPU is finishing a scan at this
 797          * time -- we don't want the scan code to enable queues.
 798          */
 799
 800         netif_tx_stop_all_queues(sdata->dev);
 801         netif_carrier_off(sdata->dev);
 802
 803         rcu_read_lock();
 804         sta = sta_info_get(sdata, bssid);
 805         if (sta) {
 806                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 807                 ieee80211_sta_tear_down_BA_sessions(sta);
 808         }
 809         rcu_read_unlock();
 810
 811         changed |= ieee80211_reset_erp_info(sdata);
 812
 813         ieee80211_led_assoc(local, 0);
 814         changed |= BSS_CHANGED_ASSOC;
 815         sdata->vif.bss_conf.assoc = false;
 816
 817         ieee80211_set_wmm_default(sdata);
 818
 819         /* channel(_type) changes are handled by ieee80211_hw_config */
 820         local->oper_channel_type = NL80211_CHAN_NO_HT;
 821
 822         /* on the next assoc, re-program HT parameters */
 823         sdata->ht_opmode_valid = false;
 824
 825         local->power_constr_level = 0;
 826
 827         del_timer_sync(&local->dynamic_ps_timer);
 828         cancel_work_sync(&local->dynamic_ps_enable_work);
 829
 830         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 831                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 832                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 833         }
 834
 835         ieee80211_hw_config(local, config_changed);
 836
 837         /* And the BSSID changed -- not very interesting here */
 838         changed |= BSS_CHANGED_BSSID;
 839         ieee80211_bss_info_change_notify(sdata, changed);
 840
 841         sta_info_destroy_addr(sdata, bssid);
 842 }
 843
 844 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 845                              struct ieee80211_hdr *hdr)
 846 {
 847         /*
 848          * We can postpone the mgd.timer whenever receiving unicast frames
 849          * from AP because we know that the connection is working both ways
 850          * at that time. But multicast frames (and hence also beacons) must
 851          * be ignored here, because we need to trigger the timer during
 852          * data idle periods for sending the periodic probe request to the
 853          * AP we're connected to.
 854          */
 855         if (is_multicast_ether_addr(hdr->addr1))
 856                 return;
 857
 858         mod_timer(&sdata->u.mgd.conn_mon_timer,
 859                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 860 }
 861
 862 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 863 {
 864         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 865         const u8 *ssid;
 866
 867         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 868         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 869                                  ssid + 2, ssid[1], NULL, 0);
 870
 871         ifmgd->probe_send_count++;
 872         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 873         run_again(ifmgd, ifmgd->probe_timeout);
 874 }
 875
 876 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 877                                    bool beacon)
 878 {
 879         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 880         bool already = false;
 881
 882         if (!ieee80211_sdata_running(sdata))
 883                 return;
 884
 885         if (sdata->local->scanning)
 886                 return;
 887
 888         if (sdata->local->tmp_channel)
 889                 return;
 890
 891         mutex_lock(&ifmgd->mtx);
 892
 893         if (!ifmgd->associated)
 894                 goto out;
 895
 896 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 897         if (beacon && net_ratelimit())
 898                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 899                        "- sending probe request\n", sdata->name);
 900 #endif
 901
 902         /*
 903          * The driver/our work has already reported this event or the
 904          * connection monitoring has kicked in and we have already sent
 905          * a probe request. Or maybe the AP died and the driver keeps
 906          * reporting until we disassociate...
 907          *
 908          * In either case we have to ignore the current call to this
 909          * function (except for setting the correct probe reason bit)
 910          * because otherwise we would reset the timer every time and
 911          * never check whether we received a probe response!
 912          */
 913         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 914                             IEEE80211_STA_CONNECTION_POLL))
 915                 already = true;
 916
 917         if (beacon)
 918                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 919         else
 920                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 921
 922         if (already)
 923                 goto out;
 924
 925         mutex_lock(&sdata->local->iflist_mtx);
 926         ieee80211_recalc_ps(sdata->local, -1);
 927         mutex_unlock(&sdata->local->iflist_mtx);
 928
 929         ifmgd->probe_send_count = 0;
 930         ieee80211_mgd_probe_ap_send(sdata);
 931  out:
 932         mutex_unlock(&ifmgd->mtx);
 933 }
 934
 935 void ieee80211_beacon_loss_work(struct work_struct *work)
 936 {
 937         struct ieee80211_sub_if_data *sdata =
 938                 container_of(work, struct ieee80211_sub_if_data,
 939                              u.mgd.beacon_loss_work);
 940
 941         ieee80211_mgd_probe_ap(sdata, true);
 942 }
 943
 944 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 945 {
 946         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 947
 948         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 949 }
 950 EXPORT_SYMBOL(ieee80211_beacon_loss);
 951
 952 static enum rx_mgmt_action __must_check
 953 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 954                          struct ieee80211_mgmt *mgmt, size_t len)
 955 {
 956         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 957         const u8 *bssid = NULL;
 958         u16 reason_code;
 959
 960         if (len < 24 + 2)
 961                 return RX_MGMT_NONE;
 962
 963         ASSERT_MGD_MTX(ifmgd);
 964
 965         bssid = ifmgd->associated->bssid;
 966
 967         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 968
 969         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 970                         sdata->name, bssid, reason_code);
 971
 972         ieee80211_set_disassoc(sdata);
 973         ieee80211_recalc_idle(sdata->local);
 974
 975         return RX_MGMT_CFG80211_DEAUTH;
 976 }
 977
 978
 979 static enum rx_mgmt_action __must_check
 980 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 981                            struct ieee80211_mgmt *mgmt, size_t len)
 982 {
 983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 984         u16 reason_code;
 985
 986         if (len < 24 + 2)
 987                 return RX_MGMT_NONE;
 988
 989         ASSERT_MGD_MTX(ifmgd);
 990
 991         if (WARN_ON(!ifmgd->associated))
 992                 return RX_MGMT_NONE;
 993
 994         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 995                 return RX_MGMT_NONE;
 996
 997         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 998
 999         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1000                         sdata->name, mgmt->sa, reason_code);
1001
1002         ieee80211_set_disassoc(sdata);
1003         ieee80211_recalc_idle(sdata->local);
1004         return RX_MGMT_CFG80211_DISASSOC;
1005 }
1006
1007
1008 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1009                                     struct ieee80211_mgmt *mgmt, size_t len)
1010 {
1011         struct ieee80211_sub_if_data *sdata = wk->sdata;
1012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1013         struct ieee80211_local *local = sdata->local;
1014         struct ieee80211_supported_band *sband;
1015         struct sta_info *sta;
1016         struct cfg80211_bss *cbss = wk->assoc.bss;
1017         u8 *pos;
1018         u32 rates, basic_rates;
1019         u16 capab_info, aid;
1020         struct ieee802_11_elems elems;
1021         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1022         u32 changed = 0;
1023         int i, j, err;
1024         bool have_higher_than_11mbit = false;
1025         u16 ap_ht_cap_flags;
1026
1027         /* AssocResp and ReassocResp have identical structure */
1028
1029         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1030         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1031
1032         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1033                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1034                        "set\n", sdata->name, aid);
1035         aid &= ~(BIT(15) | BIT(14));
1036
1037         pos = mgmt->u.assoc_resp.variable;
1038         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1039
1040         if (!elems.supp_rates) {
1041                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1042                        sdata->name);
1043                 return false;
1044         }
1045
1046         ifmgd->aid = aid;
1047
1048         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1049         if (!sta) {
1050                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1051                        " the AP\n", sdata->name);
1052                 return false;
1053         }
1054
1055         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1056                            WLAN_STA_ASSOC_AP);
1057         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1058                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1059
1060         rates = 0;
1061         basic_rates = 0;
1062         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1063
1064         for (i = 0; i < elems.supp_rates_len; i++) {
1065                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1066                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1067
1068                 if (rate > 110)
1069                         have_higher_than_11mbit = true;
1070
1071                 for (j = 0; j < sband->n_bitrates; j++) {
1072                         if (sband->bitrates[j].bitrate == rate) {
1073                                 rates |= BIT(j);
1074                                 if (is_basic)
1075                                         basic_rates |= BIT(j);
1076                                 break;
1077                         }
1078                 }
1079         }
1080
1081         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1082                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1083                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1084
1085                 if (rate > 110)
1086                         have_higher_than_11mbit = true;
1087
1088                 for (j = 0; j < sband->n_bitrates; j++) {
1089                         if (sband->bitrates[j].bitrate == rate) {
1090                                 rates |= BIT(j);
1091                                 if (is_basic)
1092                                         basic_rates |= BIT(j);
1093                                 break;
1094                         }
1095                 }
1096         }
1097
1098         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1099         sdata->vif.bss_conf.basic_rates = basic_rates;
1100
1101         /* cf. IEEE 802.11 9.2.12 */
1102         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1103             have_higher_than_11mbit)
1104                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1105         else
1106                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1107
1108         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1109                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1110                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1111
1112         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1113
1114         rate_control_rate_init(sta);
1115
1116         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1117                 set_sta_flags(sta, WLAN_STA_MFP);
1118
1119         if (elems.wmm_param)
1120                 set_sta_flags(sta, WLAN_STA_WME);
1121
1122         err = sta_info_insert(sta);
1123         sta = NULL;
1124         if (err) {
1125                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1126                        " the AP (error %d)\n", sdata->name, err);
1127                 return false;
1128         }
1129
1130         if (elems.wmm_param)
1131                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1132                                          elems.wmm_param_len);
1133         else
1134                 ieee80211_set_wmm_default(sdata);
1135
1136         local->oper_channel = wk->chan;
1137
1138         if (elems.ht_info_elem && elems.wmm_param &&
1139             (sdata->local->hw.queues >= 4) &&
1140             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1141                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1142                                                cbss->bssid, ap_ht_cap_flags);
1143
1144         /* set AID and assoc capability,
1145          * ieee80211_set_associated() will tell the driver */
1146         bss_conf->aid = aid;
1147         bss_conf->assoc_capability = capab_info;
1148         ieee80211_set_associated(sdata, cbss, changed);
1149
1150         /*
1151          * If we're using 4-addr mode, let the AP know that we're
1152          * doing so, so that it can create the STA VLAN on its side
1153          */
1154         if (ifmgd->use_4addr)
1155                 ieee80211_send_4addr_nullfunc(local, sdata);
1156
1157         /*
1158          * Start timer to probe the connection to the AP now.
1159          * Also start the timer that will detect beacon loss.
1160          */
1161         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1162         mod_beacon_timer(sdata);
1163
1164         return true;
1165 }
1166
1167
1168 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1169                                   struct ieee80211_mgmt *mgmt,
1170                                   size_t len,
1171                                   struct ieee80211_rx_status *rx_status,
1172                                   struct ieee802_11_elems *elems,
1173                                   bool beacon)
1174 {
1175         struct ieee80211_local *local = sdata->local;
1176         int freq;
1177         struct ieee80211_bss *bss;
1178         struct ieee80211_channel *channel;
1179         bool need_ps = false;
1180
1181         if (sdata->u.mgd.associated) {
1182                 bss = (void *)sdata->u.mgd.associated->priv;
1183                 /* not previously set so we may need to recalc */
1184                 need_ps = !bss->dtim_period;
1185         }
1186
1187         if (elems->ds_params && elems->ds_params_len == 1)
1188                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1189         else
1190                 freq = rx_status->freq;
1191
1192         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1193
1194         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1195                 return;
1196
1197         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1198                                         channel, beacon);
1199         if (bss)
1200                 ieee80211_rx_bss_put(local, bss);
1201
1202         if (!sdata->u.mgd.associated)
1203                 return;
1204
1205         if (need_ps) {
1206                 mutex_lock(&local->iflist_mtx);
1207                 ieee80211_recalc_ps(local, -1);
1208                 mutex_unlock(&local->iflist_mtx);
1209         }
1210
1211         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1212             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1213                                                         ETH_ALEN) == 0)) {
1214                 struct ieee80211_channel_sw_ie *sw_elem =
1215                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1216                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1217         }
1218 }
1219
1220
1221 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1222                                          struct sk_buff *skb)
1223 {
1224         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1225         struct ieee80211_if_managed *ifmgd;
1226         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1227         size_t baselen, len = skb->len;
1228         struct ieee802_11_elems elems;
1229
1230         ifmgd = &sdata->u.mgd;
1231
1232         ASSERT_MGD_MTX(ifmgd);
1233
1234         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1235                 return; /* ignore ProbeResp to foreign address */
1236
1237         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1238         if (baselen > len)
1239                 return;
1240
1241         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1242                                 &elems);
1243
1244         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1245
1246         if (ifmgd->associated &&
1247             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1248             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1249                             IEEE80211_STA_CONNECTION_POLL)) {
1250                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1251                                   IEEE80211_STA_BEACON_POLL);
1252                 mutex_lock(&sdata->local->iflist_mtx);
1253                 ieee80211_recalc_ps(sdata->local, -1);
1254                 mutex_unlock(&sdata->local->iflist_mtx);
1255                 /*
1256                  * We've received a probe response, but are not sure whether
1257                  * we have or will be receiving any beacons or data, so let's
1258                  * schedule the timers again, just in case.
1259                  */
1260                 mod_beacon_timer(sdata);
1261                 mod_timer(&ifmgd->conn_mon_timer,
1262                           round_jiffies_up(jiffies +
1263                                            IEEE80211_CONNECTION_IDLE_TIME));
1264         }
1265 }
1266
1267 /*
1268  * This is the canonical list of information elements we care about,
1269  * the filter code also gives us all changes to the Microsoft OUI
1270  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1271  *
1272  * We implement beacon filtering in software since that means we can
1273  * avoid processing the frame here and in cfg80211, and userspace
1274  * will not be able to tell whether the hardware supports it or not.
1275  *
1276  * XXX: This list needs to be dynamic -- userspace needs to be able to
1277  *      add items it requires. It also needs to be able to tell us to
1278  *      look out for other vendor IEs.
1279  */
1280 static const u64 care_about_ies =
1281         (1ULL << WLAN_EID_COUNTRY) |
1282         (1ULL << WLAN_EID_ERP_INFO) |
1283         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1284         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1285         (1ULL << WLAN_EID_HT_CAPABILITY) |
1286         (1ULL << WLAN_EID_HT_INFORMATION);
1287
1288 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1289                                      struct ieee80211_mgmt *mgmt,
1290                                      size_t len,
1291                                      struct ieee80211_rx_status *rx_status)
1292 {
1293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1294         size_t baselen;
1295         struct ieee802_11_elems elems;
1296         struct ieee80211_local *local = sdata->local;
1297         u32 changed = 0;
1298         bool erp_valid, directed_tim = false;
1299         u8 erp_value = 0;
1300         u32 ncrc;
1301         u8 *bssid;
1302
1303         ASSERT_MGD_MTX(ifmgd);
1304
1305         /* Process beacon from the current BSS */
1306         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1307         if (baselen > len)
1308                 return;
1309
1310         if (rx_status->freq != local->hw.conf.channel->center_freq)
1311                 return;
1312
1313         /*
1314          * We might have received a number of frames, among them a
1315          * disassoc frame and a beacon...
1316          */
1317         if (!ifmgd->associated)
1318                 return;
1319
1320         bssid = ifmgd->associated->bssid;
1321
1322         /*
1323          * And in theory even frames from a different AP we were just
1324          * associated to a split-second ago!
1325          */
1326         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1327                 return;
1328
1329         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1330 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1331                 if (net_ratelimit()) {
1332                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1333                                "to a received beacon\n", sdata->name);
1334                 }
1335 #endif
1336                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1337                 mutex_lock(&local->iflist_mtx);
1338                 ieee80211_recalc_ps(local, -1);
1339                 mutex_unlock(&local->iflist_mtx);
1340         }
1341
1342         /*
1343          * Push the beacon loss detection into the future since
1344          * we are processing a beacon from the AP just now.
1345          */
1346         mod_beacon_timer(sdata);
1347
1348         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1349         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1350                                           len - baselen, &elems,
1351                                           care_about_ies, ncrc);
1352
1353         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1354                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1355                                                    ifmgd->aid);
1356
1357         if (ncrc != ifmgd->beacon_crc) {
1358                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1359                                       true);
1360
1361                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1362                                          elems.wmm_param_len);
1363         }
1364
1365         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1366                 if (directed_tim) {
1367                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1368                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1369                                 ieee80211_hw_config(local,
1370                                                     IEEE80211_CONF_CHANGE_PS);
1371                                 ieee80211_send_nullfunc(local, sdata, 0);
1372                         } else {
1373                                 local->pspolling = true;
1374
1375                                 /*
1376                                  * Here is assumed that the driver will be
1377                                  * able to send ps-poll frame and receive a
1378                                  * response even though power save mode is
1379                                  * enabled, but some drivers might require
1380                                  * to disable power save here. This needs
1381                                  * to be investigated.
1382                                  */
1383                                 ieee80211_send_pspoll(local, sdata);
1384                         }
1385                 }
1386         }
1387
1388         if (ncrc == ifmgd->beacon_crc)
1389                 return;
1390         ifmgd->beacon_crc = ncrc;
1391
1392         if (elems.erp_info && elems.erp_info_len >= 1) {
1393                 erp_valid = true;
1394                 erp_value = elems.erp_info[0];
1395         } else {
1396                 erp_valid = false;
1397         }
1398         changed |= ieee80211_handle_bss_capability(sdata,
1399                         le16_to_cpu(mgmt->u.beacon.capab_info),
1400                         erp_valid, erp_value);
1401
1402
1403         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1404             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1405                 struct sta_info *sta;
1406                 struct ieee80211_supported_band *sband;
1407                 u16 ap_ht_cap_flags;
1408
1409                 rcu_read_lock();
1410
1411                 sta = sta_info_get(sdata, bssid);
1412                 if (WARN_ON(!sta)) {
1413                         rcu_read_unlock();
1414                         return;
1415                 }
1416
1417                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1418
1419                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1420                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1421
1422                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1423
1424                 rcu_read_unlock();
1425
1426                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1427                                                bssid, ap_ht_cap_flags);
1428         }
1429
1430         /* Note: country IE parsing is done for us by cfg80211 */
1431         if (elems.country_elem) {
1432                 /* TODO: IBSS also needs this */
1433                 if (elems.pwr_constr_elem)
1434                         ieee80211_handle_pwr_constr(sdata,
1435                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1436                                 elems.pwr_constr_elem,
1437                                 elems.pwr_constr_elem_len);
1438         }
1439
1440         ieee80211_bss_info_change_notify(sdata, changed);
1441 }
1442
1443 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1444                                           struct sk_buff *skb)
1445 {
1446         struct ieee80211_local *local = sdata->local;
1447         struct ieee80211_mgmt *mgmt;
1448         u16 fc;
1449
1450         if (skb->len < 24)
1451                 return RX_DROP_MONITOR;
1452
1453         mgmt = (struct ieee80211_mgmt *) skb->data;
1454         fc = le16_to_cpu(mgmt->frame_control);
1455
1456         switch (fc & IEEE80211_FCTL_STYPE) {
1457         case IEEE80211_STYPE_PROBE_RESP:
1458         case IEEE80211_STYPE_BEACON:
1459         case IEEE80211_STYPE_DEAUTH:
1460         case IEEE80211_STYPE_DISASSOC:
1461         case IEEE80211_STYPE_ACTION:
1462                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1463                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1464                 return RX_QUEUED;
1465         }
1466
1467         return RX_DROP_MONITOR;
1468 }
1469
1470 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1471                                          struct sk_buff *skb)
1472 {
1473         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1474         struct ieee80211_rx_status *rx_status;
1475         struct ieee80211_mgmt *mgmt;
1476         enum rx_mgmt_action rma = RX_MGMT_NONE;
1477         u16 fc;
1478
1479         rx_status = (struct ieee80211_rx_status *) skb->cb;
1480         mgmt = (struct ieee80211_mgmt *) skb->data;
1481         fc = le16_to_cpu(mgmt->frame_control);
1482
1483         mutex_lock(&ifmgd->mtx);
1484
1485         if (ifmgd->associated &&
1486             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1487                 switch (fc & IEEE80211_FCTL_STYPE) {
1488                 case IEEE80211_STYPE_BEACON:
1489                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1490                                                  rx_status);
1491                         break;
1492                 case IEEE80211_STYPE_PROBE_RESP:
1493                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1494                         break;
1495                 case IEEE80211_STYPE_DEAUTH:
1496                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1497                         break;
1498                 case IEEE80211_STYPE_DISASSOC:
1499                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1500                         break;
1501                 case IEEE80211_STYPE_ACTION:
1502                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1503                                 break;
1504
1505                         ieee80211_sta_process_chanswitch(sdata,
1506                                         &mgmt->u.action.u.chan_switch.sw_elem,
1507                                         (void *)ifmgd->associated->priv);
1508                         break;
1509                 }
1510                 mutex_unlock(&ifmgd->mtx);
1511
1512                 switch (rma) {
1513                 case RX_MGMT_NONE:
1514                         /* no action */
1515                         break;
1516                 case RX_MGMT_CFG80211_DEAUTH:
1517                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1518                         break;
1519                 case RX_MGMT_CFG80211_DISASSOC:
1520                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1521                         break;
1522                 default:
1523                         WARN(1, "unexpected: %d", rma);
1524                 }
1525                 goto out;
1526         }
1527
1528         mutex_unlock(&ifmgd->mtx);
1529
1530         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1531             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1532                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1533
1534  out:
1535         kfree_skb(skb);
1536 }
1537
1538 static void ieee80211_sta_timer(unsigned long data)
1539 {
1540         struct ieee80211_sub_if_data *sdata =
1541                 (struct ieee80211_sub_if_data *) data;
1542         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1543         struct ieee80211_local *local = sdata->local;
1544
1545         if (local->quiescing) {
1546                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1547                 return;
1548         }
1549
1550         ieee80211_queue_work(&local->hw, &ifmgd->work);
1551 }
1552
1553 static void ieee80211_sta_work(struct work_struct *work)
1554 {
1555         struct ieee80211_sub_if_data *sdata =
1556                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1557         struct ieee80211_local *local = sdata->local;
1558         struct ieee80211_if_managed *ifmgd;
1559         struct sk_buff *skb;
1560
1561         if (!ieee80211_sdata_running(sdata))
1562                 return;
1563
1564         if (local->scanning)
1565                 return;
1566
1567         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1568                 return;
1569
1570         /*
1571          * ieee80211_queue_work() should have picked up most cases,
1572          * here we'll pick the the rest.
1573          */
1574         if (WARN(local->suspended, "STA MLME work scheduled while "
1575                  "going to suspend\n"))
1576                 return;
1577
1578         ifmgd = &sdata->u.mgd;
1579
1580         /* first process frames to avoid timing out while a frame is pending */
1581         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1582                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1583
1584         /* then process the rest of the work */
1585         mutex_lock(&ifmgd->mtx);
1586
1587         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1588                             IEEE80211_STA_CONNECTION_POLL) &&
1589             ifmgd->associated) {
1590                 u8 bssid[ETH_ALEN];
1591
1592                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1593                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1594                         run_again(ifmgd, ifmgd->probe_timeout);
1595
1596                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1598                         printk(KERN_DEBUG "No probe response from AP %pM"
1599                                 " after %dms, try %d\n", bssid,
1600                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1601                                 ifmgd->probe_send_count);
1602 #endif
1603                         ieee80211_mgd_probe_ap_send(sdata);
1604                 } else {
1605                         /*
1606                          * We actually lost the connection ... or did we?
1607                          * Let's make sure!
1608                          */
1609                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1610                                           IEEE80211_STA_BEACON_POLL);
1611                         printk(KERN_DEBUG "No probe response from AP %pM"
1612                                 " after %dms, disconnecting.\n",
1613                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1614                         ieee80211_set_disassoc(sdata);
1615                         ieee80211_recalc_idle(local);
1616                         mutex_unlock(&ifmgd->mtx);
1617                         /*
1618                          * must be outside lock due to cfg80211,
1619                          * but that's not a problem.
1620                          */
1621                         ieee80211_send_deauth_disassoc(sdata, bssid,
1622                                         IEEE80211_STYPE_DEAUTH,
1623                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1624                                         NULL);
1625                         mutex_lock(&ifmgd->mtx);
1626                 }
1627         }
1628
1629         mutex_unlock(&ifmgd->mtx);
1630 }
1631
1632 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1633 {
1634         struct ieee80211_sub_if_data *sdata =
1635                 (struct ieee80211_sub_if_data *) data;
1636         struct ieee80211_local *local = sdata->local;
1637
1638         if (local->quiescing)
1639                 return;
1640
1641         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1642 }
1643
1644 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1645 {
1646         struct ieee80211_sub_if_data *sdata =
1647                 (struct ieee80211_sub_if_data *) data;
1648         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1649         struct ieee80211_local *local = sdata->local;
1650
1651         if (local->quiescing)
1652                 return;
1653
1654         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1655 }
1656
1657 static void ieee80211_sta_monitor_work(struct work_struct *work)
1658 {
1659         struct ieee80211_sub_if_data *sdata =
1660                 container_of(work, struct ieee80211_sub_if_data,
1661                              u.mgd.monitor_work);
1662
1663         ieee80211_mgd_probe_ap(sdata, false);
1664 }
1665
1666 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1667 {
1668         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1669                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1670                                         IEEE80211_STA_CONNECTION_POLL);
1671
1672                 /* let's probe the connection once */
1673                 ieee80211_queue_work(&sdata->local->hw,
1674                            &sdata->u.mgd.monitor_work);
1675                 /* and do all the other regular work too */
1676                 ieee80211_queue_work(&sdata->local->hw,
1677                            &sdata->u.mgd.work);
1678         }
1679 }
1680
1681 #ifdef CONFIG_PM
1682 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1683 {
1684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1685
1686         /*
1687          * we need to use atomic bitops for the running bits
1688          * only because both timers might fire at the same
1689          * time -- the code here is properly synchronised.
1690          */
1691
1692         cancel_work_sync(&ifmgd->work);
1693         cancel_work_sync(&ifmgd->beacon_loss_work);
1694         if (del_timer_sync(&ifmgd->timer))
1695                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1696
1697         cancel_work_sync(&ifmgd->chswitch_work);
1698         if (del_timer_sync(&ifmgd->chswitch_timer))
1699                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1700
1701         cancel_work_sync(&ifmgd->monitor_work);
1702         /* these will just be re-established on connection */
1703         del_timer_sync(&ifmgd->conn_mon_timer);
1704         del_timer_sync(&ifmgd->bcn_mon_timer);
1705 }
1706
1707 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1708 {
1709         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1710
1711         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1712                 add_timer(&ifmgd->timer);
1713         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1714                 add_timer(&ifmgd->chswitch_timer);
1715 }
1716 #endif
1717
1718 /* interface setup */
1719 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1720 {
1721         struct ieee80211_if_managed *ifmgd;
1722
1723         ifmgd = &sdata->u.mgd;
1724         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1725         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1726         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1727         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1728         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1729                     (unsigned long) sdata);
1730         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1731                     (unsigned long) sdata);
1732         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1733                     (unsigned long) sdata);
1734         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1735                     (unsigned long) sdata);
1736         skb_queue_head_init(&ifmgd->skb_queue);
1737
1738         ifmgd->flags = 0;
1739
1740         mutex_init(&ifmgd->mtx);
1741
1742         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1743                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1744         else
1745                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1746 }
1747
1748 /* scan finished notification */
1749 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1750 {
1751         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1752
1753         /* Restart STA timers */
1754         rcu_read_lock();
1755         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1756                 ieee80211_restart_sta_timer(sdata);
1757         rcu_read_unlock();
1758 }
1759
1760 int ieee80211_max_network_latency(struct notifier_block *nb,
1761                                   unsigned long data, void *dummy)
1762 {
1763         s32 latency_usec = (s32) data;
1764         struct ieee80211_local *local =
1765                 container_of(nb, struct ieee80211_local,
1766                              network_latency_notifier);
1767
1768         mutex_lock(&local->iflist_mtx);
1769         ieee80211_recalc_ps(local, latency_usec);
1770         mutex_unlock(&local->iflist_mtx);
1771
1772         return 0;
1773 }
1774
1775 /* config hooks */
1776 static enum work_done_result
1777 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1778                           struct sk_buff *skb)
1779 {
1780         if (!skb) {
1781                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1782                 return WORK_DONE_DESTROY;
1783         }
1784
1785         if (wk->type == IEEE80211_WORK_AUTH) {
1786                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1787                 return WORK_DONE_DESTROY;
1788         }
1789
1790         mutex_lock(&wk->sdata->u.mgd.mtx);
1791         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1792         mutex_unlock(&wk->sdata->u.mgd.mtx);
1793
1794         wk->type = IEEE80211_WORK_AUTH;
1795         wk->probe_auth.tries = 0;
1796         return WORK_DONE_REQUEUE;
1797 }
1798
1799 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1800                        struct cfg80211_auth_request *req)
1801 {
1802         const u8 *ssid;
1803         struct ieee80211_work *wk;
1804         u16 auth_alg;
1805
1806         switch (req->auth_type) {
1807         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1808                 auth_alg = WLAN_AUTH_OPEN;
1809                 break;
1810         case NL80211_AUTHTYPE_SHARED_KEY:
1811                 auth_alg = WLAN_AUTH_SHARED_KEY;
1812                 break;
1813         case NL80211_AUTHTYPE_FT:
1814                 auth_alg = WLAN_AUTH_FT;
1815                 break;
1816         case NL80211_AUTHTYPE_NETWORK_EAP:
1817                 auth_alg = WLAN_AUTH_LEAP;
1818                 break;
1819         default:
1820                 return -EOPNOTSUPP;
1821         }
1822
1823         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1824         if (!wk)
1825                 return -ENOMEM;
1826
1827         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1828
1829         if (req->ie && req->ie_len) {
1830                 memcpy(wk->ie, req->ie, req->ie_len);
1831                 wk->ie_len = req->ie_len;
1832         }
1833
1834         if (req->key && req->key_len) {
1835                 wk->probe_auth.key_len = req->key_len;
1836                 wk->probe_auth.key_idx = req->key_idx;
1837                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1838         }
1839
1840         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1841         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1842         wk->probe_auth.ssid_len = ssid[1];
1843
1844         wk->probe_auth.algorithm = auth_alg;
1845         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1846
1847         /* if we already have a probe, don't probe again */
1848         if (req->bss->proberesp_ies)
1849                 wk->type = IEEE80211_WORK_AUTH;
1850         else
1851                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1852         wk->chan = req->bss->channel;
1853         wk->sdata = sdata;
1854         wk->done = ieee80211_probe_auth_done;
1855
1856         ieee80211_add_work(wk);
1857         return 0;
1858 }
1859
1860 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1861                                                   struct sk_buff *skb)
1862 {
1863         struct ieee80211_mgmt *mgmt;
1864         u16 status;
1865
1866         if (!skb) {
1867                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1868                 return WORK_DONE_DESTROY;
1869         }
1870
1871         mgmt = (void *)skb->data;
1872         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1873
1874         if (status == WLAN_STATUS_SUCCESS) {
1875                 mutex_lock(&wk->sdata->u.mgd.mtx);
1876                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1877                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1878                         /* oops -- internal error -- send timeout for now */
1879                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1880                                                     wk->filter_ta);
1881                         return WORK_DONE_DESTROY;
1882                 }
1883                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1884         }
1885
1886         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1887         return WORK_DONE_DESTROY;
1888 }
1889
1890 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1891                         struct cfg80211_assoc_request *req)
1892 {
1893         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1894         struct ieee80211_bss *bss = (void *)req->bss->priv;
1895         struct ieee80211_work *wk;
1896         const u8 *ssid;
1897         int i;
1898
1899         mutex_lock(&ifmgd->mtx);
1900         if (ifmgd->associated) {
1901                 if (!req->prev_bssid ||
1902                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
1903                            ETH_ALEN)) {
1904                         /*
1905                          * We are already associated and the request was not a
1906                          * reassociation request from the current BSS, so
1907                          * reject it.
1908                          */
1909                         mutex_unlock(&ifmgd->mtx);
1910                         return -EALREADY;
1911                 }
1912
1913                 /* Trying to reassociate - clear previous association state */
1914                 ieee80211_set_disassoc(sdata);
1915         }
1916         mutex_unlock(&ifmgd->mtx);
1917
1918         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1919         if (!wk)
1920                 return -ENOMEM;
1921
1922         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1923         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1924
1925         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1926                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1927                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1928                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1929                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1930
1931
1932         if (req->ie && req->ie_len) {
1933                 memcpy(wk->ie, req->ie, req->ie_len);
1934                 wk->ie_len = req->ie_len;
1935         } else
1936                 wk->ie_len = 0;
1937
1938         wk->assoc.bss = req->bss;
1939
1940         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1941
1942         /* new association always uses requested smps mode */
1943         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1944                 if (ifmgd->powersave)
1945                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1946                 else
1947                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1948         } else
1949                 ifmgd->ap_smps = ifmgd->req_smps;
1950
1951         wk->assoc.smps = ifmgd->ap_smps;
1952         /*
1953          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1954          * We still associate in non-HT mode (11a/b/g) if any one of these
1955          * ciphers is configured as pairwise.
1956          * We can set this to true for non-11n hardware, that'll be checked
1957          * separately along with the peer capabilities.
1958          */
1959         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1960         wk->assoc.capability = req->bss->capability;
1961         wk->assoc.wmm_used = bss->wmm_used;
1962         wk->assoc.supp_rates = bss->supp_rates;
1963         wk->assoc.supp_rates_len = bss->supp_rates_len;
1964         wk->assoc.ht_information_ie =
1965                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1966
1967         if (bss->wmm_used && bss->uapsd_supported &&
1968             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1969                 wk->assoc.uapsd_used = true;
1970                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1971         } else {
1972                 wk->assoc.uapsd_used = false;
1973                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1974         }
1975
1976         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1977         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1978         wk->assoc.ssid_len = ssid[1];
1979
1980         if (req->prev_bssid)
1981                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1982
1983         wk->type = IEEE80211_WORK_ASSOC;
1984         wk->chan = req->bss->channel;
1985         wk->sdata = sdata;
1986         wk->done = ieee80211_assoc_done;
1987
1988         if (req->use_mfp) {
1989                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1990                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1991         } else {
1992                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1993                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1994         }
1995
1996         if (req->crypto.control_port)
1997                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1998         else
1999                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2000
2001         ieee80211_add_work(wk);
2002         return 0;
2003 }
2004
2005 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2006                          struct cfg80211_deauth_request *req,
2007                          void *cookie)
2008 {
2009         struct ieee80211_local *local = sdata->local;
2010         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2011         struct ieee80211_work *wk;
2012         const u8 *bssid = req->bss->bssid;
2013
2014         mutex_lock(&ifmgd->mtx);
2015
2016         if (ifmgd->associated == req->bss) {
2017                 bssid = req->bss->bssid;
2018                 ieee80211_set_disassoc(sdata);
2019                 mutex_unlock(&ifmgd->mtx);
2020         } else {
2021                 bool not_auth_yet = false;
2022
2023                 mutex_unlock(&ifmgd->mtx);
2024
2025                 mutex_lock(&local->work_mtx);
2026                 list_for_each_entry(wk, &local->work_list, list) {
2027                         if (wk->sdata != sdata)
2028                                 continue;
2029
2030                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2031                             wk->type != IEEE80211_WORK_AUTH)
2032                                 continue;
2033
2034                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2035                                 continue;
2036
2037                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2038                         list_del_rcu(&wk->list);
2039                         free_work(wk);
2040                         break;
2041                 }
2042                 mutex_unlock(&local->work_mtx);
2043
2044                 /*
2045                  * If somebody requests authentication and we haven't
2046                  * sent out an auth frame yet there's no need to send
2047                  * out a deauth frame either. If the state was PROBE,
2048                  * then this is the case. If it's AUTH we have sent a
2049                  * frame, and if it's IDLE we have completed the auth
2050                  * process already.
2051                  */
2052                 if (not_auth_yet) {
2053                         __cfg80211_auth_canceled(sdata->dev, bssid);
2054                         return 0;
2055                 }
2056         }
2057
2058         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2059                sdata->name, bssid, req->reason_code);
2060
2061         ieee80211_send_deauth_disassoc(sdata, bssid,
2062                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2063                         cookie);
2064
2065         ieee80211_recalc_idle(sdata->local);
2066
2067         return 0;
2068 }
2069
2070 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2071                            struct cfg80211_disassoc_request *req,
2072                            void *cookie)
2073 {
2074         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2075
2076         mutex_lock(&ifmgd->mtx);
2077
2078         /*
2079          * cfg80211 should catch this ... but it's racy since
2080          * we can receive a disassoc frame, process it, hand it
2081          * to cfg80211 while that's in a locked section already
2082          * trying to tell us that the user wants to disconnect.
2083          */
2084         if (ifmgd->associated != req->bss) {
2085                 mutex_unlock(&ifmgd->mtx);
2086                 return -ENOLINK;
2087         }
2088
2089         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2090                sdata->name, req->bss->bssid, req->reason_code);
2091
2092         ieee80211_set_disassoc(sdata);
2093
2094         mutex_unlock(&ifmgd->mtx);
2095
2096         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2097                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2098                         cookie);
2099
2100         ieee80211_recalc_idle(sdata->local);
2101
2102         return 0;
2103 }
2104
2105 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2106                          struct ieee80211_channel *chan,
2107                          enum nl80211_channel_type channel_type,
2108                          const u8 *buf, size_t len, u64 *cookie)
2109 {
2110         struct ieee80211_local *local = sdata->local;
2111         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2112         struct sk_buff *skb;
2113
2114         /* Check that we are on the requested channel for transmission */
2115         if ((chan != local->tmp_channel ||
2116              channel_type != local->tmp_channel_type) &&
2117             (chan != local->oper_channel ||
2118              channel_type != local->oper_channel_type))
2119                 return -EBUSY;
2120
2121         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2122         if (!skb)
2123                 return -ENOMEM;
2124         skb_reserve(skb, local->hw.extra_tx_headroom);
2125
2126         memcpy(skb_put(skb, len), buf, len);
2127
2128         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2129                 IEEE80211_SKB_CB(skb)->flags |=
2130                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2131         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2132                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2133         skb->dev = sdata->dev;
2134         ieee80211_tx_skb(sdata, skb);
2135
2136         *cookie = (unsigned long) skb;
2137         return 0;
2138 }