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 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 #define TMR_RUNNING_TIMER       0
  58 #define TMR_RUNNING_CHANSW      1
  59
  60 /*
  61  * All cfg80211 functions have to be called outside a locked
  62  * section so that they can acquire a lock themselves... This
  63  * is much simpler than queuing up things in cfg80211, but we
  64  * do need some indirection for that here.
  65  */
  66 enum rx_mgmt_action {
  67         /* no action required */
  68         RX_MGMT_NONE,
  69
  70         /* caller must call cfg80211_send_rx_auth() */
  71         RX_MGMT_CFG80211_AUTH,
  72
  73         /* caller must call cfg80211_send_rx_assoc() */
  74         RX_MGMT_CFG80211_ASSOC,
  75
  76         /* caller must call cfg80211_send_deauth() */
  77         RX_MGMT_CFG80211_DEAUTH,
  78
  79         /* caller must call cfg80211_send_disassoc() */
  80         RX_MGMT_CFG80211_DISASSOC,
  81
  82         /* caller must tell cfg80211 about internal error */
  83         RX_MGMT_CFG80211_ASSOC_ERROR,
  84 };
  85
  86 /* utils */
  87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  88 {
  89         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  90 }
  91
  92 /*
  93  * We can have multiple work items (and connection probing)
  94  * scheduling this timer, but we need to take care to only
  95  * reschedule it when it should fire _earlier_ than it was
  96  * asked for before, or if it's not pending right now. This
  97  * function ensures that. Note that it then is required to
  98  * run this function for all timeouts after the first one
  99  * has happened -- the work that runs from this timer will
 100  * do that.
 101  */
 102 static void run_again(struct ieee80211_if_managed *ifmgd,
 103                              unsigned long timeout)
 104 {
 105         ASSERT_MGD_MTX(ifmgd);
 106
 107         if (!timer_pending(&ifmgd->timer) ||
 108             time_before(timeout, ifmgd->timer.expires))
 109                 mod_timer(&ifmgd->timer, timeout);
 110 }
 111
 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 113 {
 114         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 119 }
 120
 121 static int ecw2cw(int ecw)
 122 {
 123         return (1 << ecw) - 1;
 124 }
 125
 126 /*
 127  * ieee80211_enable_ht should be called only after the operating band
 128  * has been determined as ht configuration depends on the hw's
 129  * HT abilities for a specific band.
 130  */
 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 132                                struct ieee80211_ht_info *hti,
 133                                const u8 *bssid, u16 ap_ht_cap_flags)
 134 {
 135         struct ieee80211_local *local = sdata->local;
 136         struct ieee80211_supported_band *sband;
 137         struct sta_info *sta;
 138         u32 changed = 0;
 139         u16 ht_opmode;
 140         bool enable_ht = true, ht_changed;
 141         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 142
 143         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 144
 145         /* HT is not supported */
 146         if (!sband->ht_cap.ht_supported)
 147                 enable_ht = false;
 148
 149         /* check that channel matches the right operating channel */
 150         if (local->hw.conf.channel->center_freq !=
 151             ieee80211_channel_to_frequency(hti->control_chan))
 152                 enable_ht = false;
 153
 154         if (enable_ht) {
 155                 channel_type = NL80211_CHAN_HT20;
 156
 157                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 158                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 159                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 160                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 161                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 162                                 if (!(local->hw.conf.channel->flags &
 163                                     IEEE80211_CHAN_NO_HT40PLUS))
 164                                         channel_type = NL80211_CHAN_HT40PLUS;
 165                                 break;
 166                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 167                                 if (!(local->hw.conf.channel->flags &
 168                                     IEEE80211_CHAN_NO_HT40MINUS))
 169                                         channel_type = NL80211_CHAN_HT40MINUS;
 170                                 break;
 171                         }
 172                 }
 173         }
 174
 175         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 176                      channel_type != local->hw.conf.channel_type;
 177
 178         local->oper_channel_type = channel_type;
 179
 180         if (ht_changed) {
 181                 /* channel_type change automatically detected */
 182                 ieee80211_hw_config(local, 0);
 183
 184                 rcu_read_lock();
 185                 sta = sta_info_get(sdata, bssid);
 186                 if (sta)
 187                         rate_control_rate_update(local, sband, sta,
 188                                                  IEEE80211_RC_HT_CHANGED,
 189                                                  local->oper_channel_type);
 190                 rcu_read_unlock();
 191         }
 192
 193         /* disable HT */
 194         if (!enable_ht)
 195                 return 0;
 196
 197         ht_opmode = le16_to_cpu(hti->operation_mode);
 198
 199         /* if bss configuration changed store the new one */
 200         if (!sdata->ht_opmode_valid ||
 201             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 202                 changed |= BSS_CHANGED_HT;
 203                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 204                 sdata->ht_opmode_valid = true;
 205         }
 206
 207         return changed;
 208 }
 209
 210 /* frame sending functions */
 211
 212 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 213                                            const u8 *bssid, u16 stype, u16 reason,
 214                                            void *cookie, bool send_frame)
 215 {
 216         struct ieee80211_local *local = sdata->local;
 217         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 218         struct sk_buff *skb;
 219         struct ieee80211_mgmt *mgmt;
 220
 221         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 222         if (!skb) {
 223                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 224                        "deauth/disassoc frame\n", sdata->name);
 225                 return;
 226         }
 227         skb_reserve(skb, local->hw.extra_tx_headroom);
 228
 229         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 230         memset(mgmt, 0, 24);
 231         memcpy(mgmt->da, bssid, ETH_ALEN);
 232         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 233         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 234         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 235         skb_put(skb, 2);
 236         /* u.deauth.reason_code == u.disassoc.reason_code */
 237         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 238
 239         if (stype == IEEE80211_STYPE_DEAUTH)
 240                 if (cookie)
 241                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 242                 else
 243                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 244         else
 245                 if (cookie)
 246                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 247                 else
 248                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 249         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 250                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 251
 252         if (send_frame)
 253                 ieee80211_tx_skb(sdata, skb);
 254         else
 255                 kfree_skb(skb);
 256 }
 257
 258 void ieee80211_send_pspoll(struct ieee80211_local *local,
 259                            struct ieee80211_sub_if_data *sdata)
 260 {
 261         struct ieee80211_pspoll *pspoll;
 262         struct sk_buff *skb;
 263
 264         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 265         if (!skb)
 266                 return;
 267
 268         pspoll = (struct ieee80211_pspoll *) skb->data;
 269         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 270
 271         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 272         ieee80211_tx_skb(sdata, skb);
 273 }
 274
 275 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 276                              struct ieee80211_sub_if_data *sdata,
 277                              int powersave)
 278 {
 279         struct sk_buff *skb;
 280         struct ieee80211_hdr_3addr *nullfunc;
 281
 282         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 283         if (!skb)
 284                 return;
 285
 286         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 287         if (powersave)
 288                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 289
 290         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 291         ieee80211_tx_skb(sdata, skb);
 292 }
 293
 294 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 295                                           struct ieee80211_sub_if_data *sdata)
 296 {
 297         struct sk_buff *skb;
 298         struct ieee80211_hdr *nullfunc;
 299         __le16 fc;
 300
 301         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 302                 return;
 303
 304         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 305         if (!skb) {
 306                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 307                        "nullfunc frame\n", sdata->name);
 308                 return;
 309         }
 310         skb_reserve(skb, local->hw.extra_tx_headroom);
 311
 312         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 313         memset(nullfunc, 0, 30);
 314         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 315                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 316         nullfunc->frame_control = fc;
 317         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 318         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 319         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 320         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 321
 322         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 323         ieee80211_tx_skb(sdata, skb);
 324 }
 325
 326 /* spectrum management related things */
 327 static void ieee80211_chswitch_work(struct work_struct *work)
 328 {
 329         struct ieee80211_sub_if_data *sdata =
 330                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 331         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 332
 333         if (!ieee80211_sdata_running(sdata))
 334                 return;
 335
 336         mutex_lock(&ifmgd->mtx);
 337         if (!ifmgd->associated)
 338                 goto out;
 339
 340         sdata->local->oper_channel = sdata->local->csa_channel;
 341         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 342
 343         /* XXX: shouldn't really modify cfg80211-owned data! */
 344         ifmgd->associated->channel = sdata->local->oper_channel;
 345
 346         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 347                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 348  out:
 349         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 350         mutex_unlock(&ifmgd->mtx);
 351 }
 352
 353 static void ieee80211_chswitch_timer(unsigned long data)
 354 {
 355         struct ieee80211_sub_if_data *sdata =
 356                 (struct ieee80211_sub_if_data *) data;
 357         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 358
 359         if (sdata->local->quiescing) {
 360                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 361                 return;
 362         }
 363
 364         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 365 }
 366
 367 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 368                                       struct ieee80211_channel_sw_ie *sw_elem,
 369                                       struct ieee80211_bss *bss)
 370 {
 371         struct cfg80211_bss *cbss =
 372                 container_of((void *)bss, struct cfg80211_bss, priv);
 373         struct ieee80211_channel *new_ch;
 374         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 375         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 376
 377         ASSERT_MGD_MTX(ifmgd);
 378
 379         if (!ifmgd->associated)
 380                 return;
 381
 382         if (sdata->local->scanning)
 383                 return;
 384
 385         /* Disregard subsequent beacons if we are already running a timer
 386            processing a CSA */
 387
 388         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 389                 return;
 390
 391         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 392         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 393                 return;
 394
 395         sdata->local->csa_channel = new_ch;
 396
 397         if (sw_elem->count <= 1) {
 398                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 399         } else {
 400                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 401                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 402                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 403                 mod_timer(&ifmgd->chswitch_timer,
 404                           jiffies +
 405                           msecs_to_jiffies(sw_elem->count *
 406                                            cbss->beacon_interval));
 407         }
 408 }
 409
 410 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 411                                         u16 capab_info, u8 *pwr_constr_elem,
 412                                         u8 pwr_constr_elem_len)
 413 {
 414         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 415
 416         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 417                 return;
 418
 419         /* Power constraint IE length should be 1 octet */
 420         if (pwr_constr_elem_len != 1)
 421                 return;
 422
 423         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 424             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 425                 sdata->local->power_constr_level = *pwr_constr_elem;
 426                 ieee80211_hw_config(sdata->local, 0);
 427         }
 428 }
 429
 430 /* powersave */
 431 static void ieee80211_enable_ps(struct ieee80211_local *local,
 432                                 struct ieee80211_sub_if_data *sdata)
 433 {
 434         struct ieee80211_conf *conf = &local->hw.conf;
 435
 436         /*
 437          * If we are scanning right now then the parameters will
 438          * take effect when scan finishes.
 439          */
 440         if (local->scanning)
 441                 return;
 442
 443         if (conf->dynamic_ps_timeout > 0 &&
 444             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 445                 mod_timer(&local->dynamic_ps_timer, jiffies +
 446                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 447         } else {
 448                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 449                         ieee80211_send_nullfunc(local, sdata, 1);
 450
 451                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 452                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 453                         return;
 454
 455                 conf->flags |= IEEE80211_CONF_PS;
 456                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 457         }
 458 }
 459
 460 static void ieee80211_change_ps(struct ieee80211_local *local)
 461 {
 462         struct ieee80211_conf *conf = &local->hw.conf;
 463
 464         if (local->ps_sdata) {
 465                 ieee80211_enable_ps(local, local->ps_sdata);
 466         } else if (conf->flags & IEEE80211_CONF_PS) {
 467                 conf->flags &= ~IEEE80211_CONF_PS;
 468                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 469                 del_timer_sync(&local->dynamic_ps_timer);
 470                 cancel_work_sync(&local->dynamic_ps_enable_work);
 471         }
 472 }
 473
 474 /* need to hold RTNL or interface lock */
 475 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 476 {
 477         struct ieee80211_sub_if_data *sdata, *found = NULL;
 478         int count = 0;
 479
 480         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 481                 local->ps_sdata = NULL;
 482                 return;
 483         }
 484
 485         if (!list_empty(&local->work_list)) {
 486                 local->ps_sdata = NULL;
 487                 goto change;
 488         }
 489
 490         list_for_each_entry(sdata, &local->interfaces, list) {
 491                 if (!ieee80211_sdata_running(sdata))
 492                         continue;
 493                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 494                         continue;
 495                 found = sdata;
 496                 count++;
 497         }
 498
 499         if (count == 1 && found->u.mgd.powersave &&
 500             found->u.mgd.associated &&
 501             found->u.mgd.associated->beacon_ies &&
 502             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 503                                     IEEE80211_STA_CONNECTION_POLL))) {
 504                 s32 beaconint_us;
 505
 506                 if (latency < 0)
 507                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 508
 509                 beaconint_us = ieee80211_tu_to_usec(
 510                                         found->vif.bss_conf.beacon_int);
 511
 512                 if (beaconint_us > latency) {
 513                         local->ps_sdata = NULL;
 514                 } else {
 515                         struct ieee80211_bss *bss;
 516                         int maxslp = 1;
 517                         u8 dtimper;
 518
 519                         bss = (void *)found->u.mgd.associated->priv;
 520                         dtimper = bss->dtim_period;
 521
 522                         /* If the TIM IE is invalid, pretend the value is 1 */
 523                         if (!dtimper)
 524                                 dtimper = 1;
 525                         else if (dtimper > 1)
 526                                 maxslp = min_t(int, dtimper,
 527                                                     latency / beaconint_us);
 528
 529                         local->hw.conf.max_sleep_period = maxslp;
 530                         local->hw.conf.ps_dtim_period = dtimper;
 531                         local->ps_sdata = found;
 532                 }
 533         } else {
 534                 local->ps_sdata = NULL;
 535         }
 536
 537  change:
 538         ieee80211_change_ps(local);
 539 }
 540
 541 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 542 {
 543         struct ieee80211_local *local =
 544                 container_of(work, struct ieee80211_local,
 545                              dynamic_ps_disable_work);
 546
 547         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 548                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 549                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 550         }
 551
 552         ieee80211_wake_queues_by_reason(&local->hw,
 553                                         IEEE80211_QUEUE_STOP_REASON_PS);
 554 }
 555
 556 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 557 {
 558         struct ieee80211_local *local =
 559                 container_of(work, struct ieee80211_local,
 560                              dynamic_ps_enable_work);
 561         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 562         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 563
 564         /* can only happen when PS was just disabled anyway */
 565         if (!sdata)
 566                 return;
 567
 568         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 569                 return;
 570
 571         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 572             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 573                 ieee80211_send_nullfunc(local, sdata, 1);
 574
 575         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 576               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 577             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 578                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 579                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 580                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 581         }
 582 }
 583
 584 void ieee80211_dynamic_ps_timer(unsigned long data)
 585 {
 586         struct ieee80211_local *local = (void *) data;
 587
 588         if (local->quiescing || local->suspended)
 589                 return;
 590
 591         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 592 }
 593
 594 /* MLME */
 595 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 596                                      struct ieee80211_if_managed *ifmgd,
 597                                      u8 *wmm_param, size_t wmm_param_len)
 598 {
 599         struct ieee80211_tx_queue_params params;
 600         size_t left;
 601         int count;
 602         u8 *pos, uapsd_queues = 0;
 603
 604         if (!local->ops->conf_tx)
 605                 return;
 606
 607         if (local->hw.queues < 4)
 608                 return;
 609
 610         if (!wmm_param)
 611                 return;
 612
 613         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 614                 return;
 615
 616         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 617                 uapsd_queues = local->uapsd_queues;
 618
 619         count = wmm_param[6] & 0x0f;
 620         if (count == ifmgd->wmm_last_param_set)
 621                 return;
 622         ifmgd->wmm_last_param_set = count;
 623
 624         pos = wmm_param + 8;
 625         left = wmm_param_len - 8;
 626
 627         memset(&params, 0, sizeof(params));
 628
 629         local->wmm_acm = 0;
 630         for (; left >= 4; left -= 4, pos += 4) {
 631                 int aci = (pos[0] >> 5) & 0x03;
 632                 int acm = (pos[0] >> 4) & 0x01;
 633                 bool uapsd = false;
 634                 int queue;
 635
 636                 switch (aci) {
 637                 case 1: /* AC_BK */
 638                         queue = 3;
 639                         if (acm)
 640                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 641                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 642                                 uapsd = true;
 643                         break;
 644                 case 2: /* AC_VI */
 645                         queue = 1;
 646                         if (acm)
 647                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 648                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 649                                 uapsd = true;
 650                         break;
 651                 case 3: /* AC_VO */
 652                         queue = 0;
 653                         if (acm)
 654                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 655                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 656                                 uapsd = true;
 657                         break;
 658                 case 0: /* AC_BE */
 659                 default:
 660                         queue = 2;
 661                         if (acm)
 662                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 663                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 664                                 uapsd = true;
 665                         break;
 666                 }
 667
 668                 params.aifs = pos[0] & 0x0f;
 669                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 670                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 671                 params.txop = get_unaligned_le16(pos + 2);
 672                 params.uapsd = uapsd;
 673
 674 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 675                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 676                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 677                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 678                        params.aifs, params.cw_min, params.cw_max, params.txop,
 679                        params.uapsd);
 680 #endif
 681                 if (drv_conf_tx(local, queue, &params))
 682                         printk(KERN_DEBUG "%s: failed to set TX queue "
 683                                "parameters for queue %d\n",
 684                                wiphy_name(local->hw.wiphy), queue);
 685         }
 686
 687         /* enable WMM or activate new settings */
 688         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 689         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 690 }
 691
 692 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 693                                            u16 capab, bool erp_valid, u8 erp)
 694 {
 695         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 696         u32 changed = 0;
 697         bool use_protection;
 698         bool use_short_preamble;
 699         bool use_short_slot;
 700
 701         if (erp_valid) {
 702                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 703                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 704         } else {
 705                 use_protection = false;
 706                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 707         }
 708
 709         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 710         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 711                 use_short_slot = true;
 712
 713         if (use_protection != bss_conf->use_cts_prot) {
 714                 bss_conf->use_cts_prot = use_protection;
 715                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 716         }
 717
 718         if (use_short_preamble != bss_conf->use_short_preamble) {
 719                 bss_conf->use_short_preamble = use_short_preamble;
 720                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 721         }
 722
 723         if (use_short_slot != bss_conf->use_short_slot) {
 724                 bss_conf->use_short_slot = use_short_slot;
 725                 changed |= BSS_CHANGED_ERP_SLOT;
 726         }
 727
 728         return changed;
 729 }
 730
 731 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 732                                      struct cfg80211_bss *cbss,
 733                                      u32 bss_info_changed)
 734 {
 735         struct ieee80211_bss *bss = (void *)cbss->priv;
 736         struct ieee80211_local *local = sdata->local;
 737
 738         bss_info_changed |= BSS_CHANGED_ASSOC;
 739         /* set timing information */
 740         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 741         sdata->vif.bss_conf.timestamp = cbss->tsf;
 742
 743         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 744         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 745                 cbss->capability, bss->has_erp_value, bss->erp_value);
 746
 747         sdata->u.mgd.associated = cbss;
 748         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 749
 750         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 751
 752         /* just to be sure */
 753         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 754                                 IEEE80211_STA_BEACON_POLL);
 755
 756         /*
 757          * Always handle WMM once after association regardless
 758          * of the first value the AP uses. Setting -1 here has
 759          * that effect because the AP values is an unsigned
 760          * 4-bit value.
 761          */
 762         sdata->u.mgd.wmm_last_param_set = -1;
 763
 764         ieee80211_led_assoc(local, 1);
 765
 766         sdata->vif.bss_conf.assoc = 1;
 767         /*
 768          * For now just always ask the driver to update the basic rateset
 769          * when we have associated, we aren't checking whether it actually
 770          * changed or not.
 771          */
 772         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 773
 774         /* And the BSSID changed - we're associated now */
 775         bss_info_changed |= BSS_CHANGED_BSSID;
 776
 777         /* Tell the driver to monitor connection quality (if supported) */
 778         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 779             sdata->vif.bss_conf.cqm_rssi_thold)
 780                 bss_info_changed |= BSS_CHANGED_CQM;
 781
 782         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 783
 784         mutex_lock(&local->iflist_mtx);
 785         ieee80211_recalc_ps(local, -1);
 786         ieee80211_recalc_smps(local, sdata);
 787         mutex_unlock(&local->iflist_mtx);
 788
 789         netif_tx_start_all_queues(sdata->dev);
 790         netif_carrier_on(sdata->dev);
 791 }
 792
 793 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 794                                    bool remove_sta)
 795 {
 796         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 797         struct ieee80211_local *local = sdata->local;
 798         struct sta_info *sta;
 799         u32 changed = 0, config_changed = 0;
 800         u8 bssid[ETH_ALEN];
 801
 802         ASSERT_MGD_MTX(ifmgd);
 803
 804         if (WARN_ON(!ifmgd->associated))
 805                 return;
 806
 807         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 808
 809         ifmgd->associated = NULL;
 810         memset(ifmgd->bssid, 0, ETH_ALEN);
 811
 812         /*
 813          * we need to commit the associated = NULL change because the
 814          * scan code uses that to determine whether this iface should
 815          * go to/wake up from powersave or not -- and could otherwise
 816          * wake the queues erroneously.
 817          */
 818         smp_mb();
 819
 820         /*
 821          * Thus, we can only afterwards stop the queues -- to account
 822          * for the case where another CPU is finishing a scan at this
 823          * time -- we don't want the scan code to enable queues.
 824          */
 825
 826         netif_tx_stop_all_queues(sdata->dev);
 827         netif_carrier_off(sdata->dev);
 828
 829         rcu_read_lock();
 830         sta = sta_info_get(sdata, bssid);
 831         if (sta) {
 832                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 833                 ieee80211_sta_tear_down_BA_sessions(sta);
 834         }
 835         rcu_read_unlock();
 836
 837         changed |= ieee80211_reset_erp_info(sdata);
 838
 839         ieee80211_led_assoc(local, 0);
 840         changed |= BSS_CHANGED_ASSOC;
 841         sdata->vif.bss_conf.assoc = false;
 842
 843         ieee80211_set_wmm_default(sdata);
 844
 845         /* channel(_type) changes are handled by ieee80211_hw_config */
 846         local->oper_channel_type = NL80211_CHAN_NO_HT;
 847
 848         /* on the next assoc, re-program HT parameters */
 849         sdata->ht_opmode_valid = false;
 850
 851         local->power_constr_level = 0;
 852
 853         del_timer_sync(&local->dynamic_ps_timer);
 854         cancel_work_sync(&local->dynamic_ps_enable_work);
 855
 856         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 857                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 858                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 859         }
 860
 861         ieee80211_hw_config(local, config_changed);
 862
 863         /* And the BSSID changed -- not very interesting here */
 864         changed |= BSS_CHANGED_BSSID;
 865         ieee80211_bss_info_change_notify(sdata, changed);
 866
 867         if (remove_sta)
 868                 sta_info_destroy_addr(sdata, bssid);
 869 }
 870
 871 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 872                              struct ieee80211_hdr *hdr)
 873 {
 874         /*
 875          * We can postpone the mgd.timer whenever receiving unicast frames
 876          * from AP because we know that the connection is working both ways
 877          * at that time. But multicast frames (and hence also beacons) must
 878          * be ignored here, because we need to trigger the timer during
 879          * data idle periods for sending the periodic probe request to the
 880          * AP we're connected to.
 881          */
 882         if (is_multicast_ether_addr(hdr->addr1))
 883                 return;
 884
 885         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 886                 return;
 887
 888         mod_timer(&sdata->u.mgd.conn_mon_timer,
 889                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 890 }
 891
 892 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 893 {
 894         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 895         const u8 *ssid;
 896
 897         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 898         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 899                                  ssid + 2, ssid[1], NULL, 0);
 900
 901         ifmgd->probe_send_count++;
 902         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 903         run_again(ifmgd, ifmgd->probe_timeout);
 904 }
 905
 906 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 907                                    bool beacon)
 908 {
 909         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 910         bool already = false;
 911
 912         if (!ieee80211_sdata_running(sdata))
 913                 return;
 914
 915         if (sdata->local->scanning)
 916                 return;
 917
 918         if (sdata->local->tmp_channel)
 919                 return;
 920
 921         mutex_lock(&ifmgd->mtx);
 922
 923         if (!ifmgd->associated)
 924                 goto out;
 925
 926 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 927         if (beacon && net_ratelimit())
 928                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 929                        "- sending probe request\n", sdata->name);
 930 #endif
 931
 932         /*
 933          * The driver/our work has already reported this event or the
 934          * connection monitoring has kicked in and we have already sent
 935          * a probe request. Or maybe the AP died and the driver keeps
 936          * reporting until we disassociate...
 937          *
 938          * In either case we have to ignore the current call to this
 939          * function (except for setting the correct probe reason bit)
 940          * because otherwise we would reset the timer every time and
 941          * never check whether we received a probe response!
 942          */
 943         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 944                             IEEE80211_STA_CONNECTION_POLL))
 945                 already = true;
 946
 947         if (beacon)
 948                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 949         else
 950                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 951
 952         if (already)
 953                 goto out;
 954
 955         mutex_lock(&sdata->local->iflist_mtx);
 956         ieee80211_recalc_ps(sdata->local, -1);
 957         mutex_unlock(&sdata->local->iflist_mtx);
 958
 959         ifmgd->probe_send_count = 0;
 960         ieee80211_mgd_probe_ap_send(sdata);
 961  out:
 962         mutex_unlock(&ifmgd->mtx);
 963 }
 964
 965 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 968         struct ieee80211_local *local = sdata->local;
 969         u8 bssid[ETH_ALEN];
 970
 971         mutex_lock(&ifmgd->mtx);
 972         if (!ifmgd->associated) {
 973                 mutex_unlock(&ifmgd->mtx);
 974                 return;
 975         }
 976
 977         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 978
 979         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
 980
 981         ieee80211_set_disassoc(sdata, true);
 982         ieee80211_recalc_idle(local);
 983         mutex_unlock(&ifmgd->mtx);
 984         /*
 985          * must be outside lock due to cfg80211,
 986          * but that's not a problem.
 987          */
 988         ieee80211_send_deauth_disassoc(sdata, bssid,
 989                                        IEEE80211_STYPE_DEAUTH,
 990                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
 991                                        NULL, true);
 992 }
 993
 994 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
 995 {
 996         struct ieee80211_sub_if_data *sdata =
 997                 container_of(work, struct ieee80211_sub_if_data,
 998                              u.mgd.beacon_connection_loss_work);
 999
1000         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1001                 __ieee80211_connection_loss(sdata);
1002         else
1003                 ieee80211_mgd_probe_ap(sdata, true);
1004 }
1005
1006 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1007 {
1008         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1009         struct ieee80211_hw *hw = &sdata->local->hw;
1010
1011         trace_api_beacon_loss(sdata);
1012
1013         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1014         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1015 }
1016 EXPORT_SYMBOL(ieee80211_beacon_loss);
1017
1018 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1019 {
1020         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1021         struct ieee80211_hw *hw = &sdata->local->hw;
1022
1023         trace_api_connection_loss(sdata);
1024
1025         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1026         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1027 }
1028 EXPORT_SYMBOL(ieee80211_connection_loss);
1029
1030
1031 static enum rx_mgmt_action __must_check
1032 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1033                          struct ieee80211_mgmt *mgmt, size_t len)
1034 {
1035         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1036         const u8 *bssid = NULL;
1037         u16 reason_code;
1038
1039         if (len < 24 + 2)
1040                 return RX_MGMT_NONE;
1041
1042         ASSERT_MGD_MTX(ifmgd);
1043
1044         bssid = ifmgd->associated->bssid;
1045
1046         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1047
1048         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1049                         sdata->name, bssid, reason_code);
1050
1051         ieee80211_set_disassoc(sdata, true);
1052         ieee80211_recalc_idle(sdata->local);
1053
1054         return RX_MGMT_CFG80211_DEAUTH;
1055 }
1056
1057
1058 static enum rx_mgmt_action __must_check
1059 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1060                            struct ieee80211_mgmt *mgmt, size_t len)
1061 {
1062         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1063         u16 reason_code;
1064
1065         if (len < 24 + 2)
1066                 return RX_MGMT_NONE;
1067
1068         ASSERT_MGD_MTX(ifmgd);
1069
1070         if (WARN_ON(!ifmgd->associated))
1071                 return RX_MGMT_NONE;
1072
1073         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1074                 return RX_MGMT_NONE;
1075
1076         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1077
1078         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1079                         sdata->name, mgmt->sa, reason_code);
1080
1081         ieee80211_set_disassoc(sdata, true);
1082         ieee80211_recalc_idle(sdata->local);
1083         return RX_MGMT_CFG80211_DISASSOC;
1084 }
1085
1086
1087 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1088                                     struct ieee80211_mgmt *mgmt, size_t len)
1089 {
1090         struct ieee80211_sub_if_data *sdata = wk->sdata;
1091         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1092         struct ieee80211_local *local = sdata->local;
1093         struct ieee80211_supported_band *sband;
1094         struct sta_info *sta;
1095         struct cfg80211_bss *cbss = wk->assoc.bss;
1096         u8 *pos;
1097         u32 rates, basic_rates;
1098         u16 capab_info, aid;
1099         struct ieee802_11_elems elems;
1100         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1101         u32 changed = 0;
1102         int i, j, err;
1103         bool have_higher_than_11mbit = false;
1104         u16 ap_ht_cap_flags;
1105
1106         /* AssocResp and ReassocResp have identical structure */
1107
1108         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1109         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1110
1111         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1112                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1113                        "set\n", sdata->name, aid);
1114         aid &= ~(BIT(15) | BIT(14));
1115
1116         pos = mgmt->u.assoc_resp.variable;
1117         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1118
1119         if (!elems.supp_rates) {
1120                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1121                        sdata->name);
1122                 return false;
1123         }
1124
1125         ifmgd->aid = aid;
1126
1127         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1128         if (!sta) {
1129                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1130                        " the AP\n", sdata->name);
1131                 return false;
1132         }
1133
1134         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1135                            WLAN_STA_ASSOC_AP);
1136         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1137                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1138
1139         rates = 0;
1140         basic_rates = 0;
1141         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1142
1143         for (i = 0; i < elems.supp_rates_len; i++) {
1144                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1145                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1146
1147                 if (rate > 110)
1148                         have_higher_than_11mbit = true;
1149
1150                 for (j = 0; j < sband->n_bitrates; j++) {
1151                         if (sband->bitrates[j].bitrate == rate) {
1152                                 rates |= BIT(j);
1153                                 if (is_basic)
1154                                         basic_rates |= BIT(j);
1155                                 break;
1156                         }
1157                 }
1158         }
1159
1160         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1161                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1162                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1163
1164                 if (rate > 110)
1165                         have_higher_than_11mbit = true;
1166
1167                 for (j = 0; j < sband->n_bitrates; j++) {
1168                         if (sband->bitrates[j].bitrate == rate) {
1169                                 rates |= BIT(j);
1170                                 if (is_basic)
1171                                         basic_rates |= BIT(j);
1172                                 break;
1173                         }
1174                 }
1175         }
1176
1177         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1178         sdata->vif.bss_conf.basic_rates = basic_rates;
1179
1180         /* cf. IEEE 802.11 9.2.12 */
1181         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1182             have_higher_than_11mbit)
1183                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1184         else
1185                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1186
1187         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1188                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1189                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1190
1191         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1192
1193         rate_control_rate_init(sta);
1194
1195         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1196                 set_sta_flags(sta, WLAN_STA_MFP);
1197
1198         if (elems.wmm_param)
1199                 set_sta_flags(sta, WLAN_STA_WME);
1200
1201         err = sta_info_insert(sta);
1202         sta = NULL;
1203         if (err) {
1204                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1205                        " the AP (error %d)\n", sdata->name, err);
1206                 return false;
1207         }
1208
1209         if (elems.wmm_param)
1210                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1211                                          elems.wmm_param_len);
1212         else
1213                 ieee80211_set_wmm_default(sdata);
1214
1215         local->oper_channel = wk->chan;
1216
1217         if (elems.ht_info_elem && elems.wmm_param &&
1218             (sdata->local->hw.queues >= 4) &&
1219             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1220                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1221                                                cbss->bssid, ap_ht_cap_flags);
1222
1223         /* set AID and assoc capability,
1224          * ieee80211_set_associated() will tell the driver */
1225         bss_conf->aid = aid;
1226         bss_conf->assoc_capability = capab_info;
1227         ieee80211_set_associated(sdata, cbss, changed);
1228
1229         /*
1230          * If we're using 4-addr mode, let the AP know that we're
1231          * doing so, so that it can create the STA VLAN on its side
1232          */
1233         if (ifmgd->use_4addr)
1234                 ieee80211_send_4addr_nullfunc(local, sdata);
1235
1236         /*
1237          * Start timer to probe the connection to the AP now.
1238          * Also start the timer that will detect beacon loss.
1239          */
1240         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1241         mod_beacon_timer(sdata);
1242
1243         return true;
1244 }
1245
1246
1247 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1248                                   struct ieee80211_mgmt *mgmt,
1249                                   size_t len,
1250                                   struct ieee80211_rx_status *rx_status,
1251                                   struct ieee802_11_elems *elems,
1252                                   bool beacon)
1253 {
1254         struct ieee80211_local *local = sdata->local;
1255         int freq;
1256         struct ieee80211_bss *bss;
1257         struct ieee80211_channel *channel;
1258         bool need_ps = false;
1259
1260         if (sdata->u.mgd.associated) {
1261                 bss = (void *)sdata->u.mgd.associated->priv;
1262                 /* not previously set so we may need to recalc */
1263                 need_ps = !bss->dtim_period;
1264         }
1265
1266         if (elems->ds_params && elems->ds_params_len == 1)
1267                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1268         else
1269                 freq = rx_status->freq;
1270
1271         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1272
1273         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1274                 return;
1275
1276         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1277                                         channel, beacon);
1278         if (bss)
1279                 ieee80211_rx_bss_put(local, bss);
1280
1281         if (!sdata->u.mgd.associated)
1282                 return;
1283
1284         if (need_ps) {
1285                 mutex_lock(&local->iflist_mtx);
1286                 ieee80211_recalc_ps(local, -1);
1287                 mutex_unlock(&local->iflist_mtx);
1288         }
1289
1290         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1291             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1292                                                         ETH_ALEN) == 0)) {
1293                 struct ieee80211_channel_sw_ie *sw_elem =
1294                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1295                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1296         }
1297 }
1298
1299
1300 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1301                                          struct sk_buff *skb)
1302 {
1303         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1304         struct ieee80211_if_managed *ifmgd;
1305         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1306         size_t baselen, len = skb->len;
1307         struct ieee802_11_elems elems;
1308
1309         ifmgd = &sdata->u.mgd;
1310
1311         ASSERT_MGD_MTX(ifmgd);
1312
1313         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1314                 return; /* ignore ProbeResp to foreign address */
1315
1316         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1317         if (baselen > len)
1318                 return;
1319
1320         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1321                                 &elems);
1322
1323         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1324
1325         if (ifmgd->associated &&
1326             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1327             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1328                             IEEE80211_STA_CONNECTION_POLL)) {
1329                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1330                                   IEEE80211_STA_BEACON_POLL);
1331                 mutex_lock(&sdata->local->iflist_mtx);
1332                 ieee80211_recalc_ps(sdata->local, -1);
1333                 mutex_unlock(&sdata->local->iflist_mtx);
1334                 /*
1335                  * We've received a probe response, but are not sure whether
1336                  * we have or will be receiving any beacons or data, so let's
1337                  * schedule the timers again, just in case.
1338                  */
1339                 mod_beacon_timer(sdata);
1340                 mod_timer(&ifmgd->conn_mon_timer,
1341                           round_jiffies_up(jiffies +
1342                                            IEEE80211_CONNECTION_IDLE_TIME));
1343         }
1344 }
1345
1346 /*
1347  * This is the canonical list of information elements we care about,
1348  * the filter code also gives us all changes to the Microsoft OUI
1349  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1350  *
1351  * We implement beacon filtering in software since that means we can
1352  * avoid processing the frame here and in cfg80211, and userspace
1353  * will not be able to tell whether the hardware supports it or not.
1354  *
1355  * XXX: This list needs to be dynamic -- userspace needs to be able to
1356  *      add items it requires. It also needs to be able to tell us to
1357  *      look out for other vendor IEs.
1358  */
1359 static const u64 care_about_ies =
1360         (1ULL << WLAN_EID_COUNTRY) |
1361         (1ULL << WLAN_EID_ERP_INFO) |
1362         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1363         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1364         (1ULL << WLAN_EID_HT_CAPABILITY) |
1365         (1ULL << WLAN_EID_HT_INFORMATION);
1366
1367 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1368                                      struct ieee80211_mgmt *mgmt,
1369                                      size_t len,
1370                                      struct ieee80211_rx_status *rx_status)
1371 {
1372         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1373         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1374         size_t baselen;
1375         struct ieee802_11_elems elems;
1376         struct ieee80211_local *local = sdata->local;
1377         u32 changed = 0;
1378         bool erp_valid, directed_tim = false;
1379         u8 erp_value = 0;
1380         u32 ncrc;
1381         u8 *bssid;
1382
1383         ASSERT_MGD_MTX(ifmgd);
1384
1385         /* Process beacon from the current BSS */
1386         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1387         if (baselen > len)
1388                 return;
1389
1390         if (rx_status->freq != local->hw.conf.channel->center_freq)
1391                 return;
1392
1393         /*
1394          * We might have received a number of frames, among them a
1395          * disassoc frame and a beacon...
1396          */
1397         if (!ifmgd->associated)
1398                 return;
1399
1400         bssid = ifmgd->associated->bssid;
1401
1402         /*
1403          * And in theory even frames from a different AP we were just
1404          * associated to a split-second ago!
1405          */
1406         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1407                 return;
1408
1409         /* Track average RSSI from the Beacon frames of the current AP */
1410         ifmgd->last_beacon_signal = rx_status->signal;
1411         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1412                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1413                 ifmgd->ave_beacon_signal = rx_status->signal;
1414                 ifmgd->last_cqm_event_signal = 0;
1415         } else {
1416                 ifmgd->ave_beacon_signal =
1417                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1418                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1419                          ifmgd->ave_beacon_signal) / 16;
1420         }
1421         if (bss_conf->cqm_rssi_thold &&
1422             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1423                 int sig = ifmgd->ave_beacon_signal / 16;
1424                 int last_event = ifmgd->last_cqm_event_signal;
1425                 int thold = bss_conf->cqm_rssi_thold;
1426                 int hyst = bss_conf->cqm_rssi_hyst;
1427                 if (sig < thold &&
1428                     (last_event == 0 || sig < last_event - hyst)) {
1429                         ifmgd->last_cqm_event_signal = sig;
1430                         ieee80211_cqm_rssi_notify(
1431                                 &sdata->vif,
1432                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1433                                 GFP_KERNEL);
1434                 } else if (sig > thold &&
1435                            (last_event == 0 || sig > last_event + hyst)) {
1436                         ifmgd->last_cqm_event_signal = sig;
1437                         ieee80211_cqm_rssi_notify(
1438                                 &sdata->vif,
1439                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1440                                 GFP_KERNEL);
1441                 }
1442         }
1443
1444         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1445 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1446                 if (net_ratelimit()) {
1447                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1448                                "to a received beacon\n", sdata->name);
1449                 }
1450 #endif
1451                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1452                 mutex_lock(&local->iflist_mtx);
1453                 ieee80211_recalc_ps(local, -1);
1454                 mutex_unlock(&local->iflist_mtx);
1455         }
1456
1457         /*
1458          * Push the beacon loss detection into the future since
1459          * we are processing a beacon from the AP just now.
1460          */
1461         mod_beacon_timer(sdata);
1462
1463         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1464         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1465                                           len - baselen, &elems,
1466                                           care_about_ies, ncrc);
1467
1468         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1469                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1470                                                    ifmgd->aid);
1471
1472         if (ncrc != ifmgd->beacon_crc) {
1473                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1474                                       true);
1475
1476                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1477                                          elems.wmm_param_len);
1478         }
1479
1480         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1481                 if (directed_tim) {
1482                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1483                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1484                                 ieee80211_hw_config(local,
1485                                                     IEEE80211_CONF_CHANGE_PS);
1486                                 ieee80211_send_nullfunc(local, sdata, 0);
1487                         } else {
1488                                 local->pspolling = true;
1489
1490                                 /*
1491                                  * Here is assumed that the driver will be
1492                                  * able to send ps-poll frame and receive a
1493                                  * response even though power save mode is
1494                                  * enabled, but some drivers might require
1495                                  * to disable power save here. This needs
1496                                  * to be investigated.
1497                                  */
1498                                 ieee80211_send_pspoll(local, sdata);
1499                         }
1500                 }
1501         }
1502
1503         if (ncrc == ifmgd->beacon_crc)
1504                 return;
1505         ifmgd->beacon_crc = ncrc;
1506
1507         if (elems.erp_info && elems.erp_info_len >= 1) {
1508                 erp_valid = true;
1509                 erp_value = elems.erp_info[0];
1510         } else {
1511                 erp_valid = false;
1512         }
1513         changed |= ieee80211_handle_bss_capability(sdata,
1514                         le16_to_cpu(mgmt->u.beacon.capab_info),
1515                         erp_valid, erp_value);
1516
1517
1518         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1519             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1520                 struct sta_info *sta;
1521                 struct ieee80211_supported_band *sband;
1522                 u16 ap_ht_cap_flags;
1523
1524                 rcu_read_lock();
1525
1526                 sta = sta_info_get(sdata, bssid);
1527                 if (WARN_ON(!sta)) {
1528                         rcu_read_unlock();
1529                         return;
1530                 }
1531
1532                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1533
1534                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1535                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1536
1537                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1538
1539                 rcu_read_unlock();
1540
1541                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1542                                                bssid, ap_ht_cap_flags);
1543         }
1544
1545         /* Note: country IE parsing is done for us by cfg80211 */
1546         if (elems.country_elem) {
1547                 /* TODO: IBSS also needs this */
1548                 if (elems.pwr_constr_elem)
1549                         ieee80211_handle_pwr_constr(sdata,
1550                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1551                                 elems.pwr_constr_elem,
1552                                 elems.pwr_constr_elem_len);
1553         }
1554
1555         ieee80211_bss_info_change_notify(sdata, changed);
1556 }
1557
1558 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1559                                           struct sk_buff *skb)
1560 {
1561         struct ieee80211_local *local = sdata->local;
1562         struct ieee80211_mgmt *mgmt;
1563         u16 fc;
1564
1565         if (skb->len < 24)
1566                 return RX_DROP_MONITOR;
1567
1568         mgmt = (struct ieee80211_mgmt *) skb->data;
1569         fc = le16_to_cpu(mgmt->frame_control);
1570
1571         switch (fc & IEEE80211_FCTL_STYPE) {
1572         case IEEE80211_STYPE_PROBE_RESP:
1573         case IEEE80211_STYPE_BEACON:
1574         case IEEE80211_STYPE_DEAUTH:
1575         case IEEE80211_STYPE_DISASSOC:
1576         case IEEE80211_STYPE_ACTION:
1577                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1578                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1579                 return RX_QUEUED;
1580         }
1581
1582         return RX_DROP_MONITOR;
1583 }
1584
1585 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1586                                          struct sk_buff *skb)
1587 {
1588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1589         struct ieee80211_rx_status *rx_status;
1590         struct ieee80211_mgmt *mgmt;
1591         enum rx_mgmt_action rma = RX_MGMT_NONE;
1592         u16 fc;
1593
1594         rx_status = (struct ieee80211_rx_status *) skb->cb;
1595         mgmt = (struct ieee80211_mgmt *) skb->data;
1596         fc = le16_to_cpu(mgmt->frame_control);
1597
1598         mutex_lock(&ifmgd->mtx);
1599
1600         if (ifmgd->associated &&
1601             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1602                 switch (fc & IEEE80211_FCTL_STYPE) {
1603                 case IEEE80211_STYPE_BEACON:
1604                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1605                                                  rx_status);
1606                         break;
1607                 case IEEE80211_STYPE_PROBE_RESP:
1608                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1609                         break;
1610                 case IEEE80211_STYPE_DEAUTH:
1611                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1612                         break;
1613                 case IEEE80211_STYPE_DISASSOC:
1614                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1615                         break;
1616                 case IEEE80211_STYPE_ACTION:
1617                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1618                                 break;
1619
1620                         ieee80211_sta_process_chanswitch(sdata,
1621                                         &mgmt->u.action.u.chan_switch.sw_elem,
1622                                         (void *)ifmgd->associated->priv);
1623                         break;
1624                 }
1625                 mutex_unlock(&ifmgd->mtx);
1626
1627                 switch (rma) {
1628                 case RX_MGMT_NONE:
1629                         /* no action */
1630                         break;
1631                 case RX_MGMT_CFG80211_DEAUTH:
1632                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1633                         break;
1634                 case RX_MGMT_CFG80211_DISASSOC:
1635                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1636                         break;
1637                 default:
1638                         WARN(1, "unexpected: %d", rma);
1639                 }
1640                 goto out;
1641         }
1642
1643         mutex_unlock(&ifmgd->mtx);
1644
1645         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1646             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1647                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1648
1649  out:
1650         kfree_skb(skb);
1651 }
1652
1653 static void ieee80211_sta_timer(unsigned long data)
1654 {
1655         struct ieee80211_sub_if_data *sdata =
1656                 (struct ieee80211_sub_if_data *) data;
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658         struct ieee80211_local *local = sdata->local;
1659
1660         if (local->quiescing) {
1661                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1662                 return;
1663         }
1664
1665         ieee80211_queue_work(&local->hw, &ifmgd->work);
1666 }
1667
1668 static void ieee80211_sta_work(struct work_struct *work)
1669 {
1670         struct ieee80211_sub_if_data *sdata =
1671                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1672         struct ieee80211_local *local = sdata->local;
1673         struct ieee80211_if_managed *ifmgd;
1674         struct sk_buff *skb;
1675
1676         if (!ieee80211_sdata_running(sdata))
1677                 return;
1678
1679         if (local->scanning)
1680                 return;
1681
1682         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1683                 return;
1684
1685         /*
1686          * ieee80211_queue_work() should have picked up most cases,
1687          * here we'll pick the the rest.
1688          */
1689         if (WARN(local->suspended, "STA MLME work scheduled while "
1690                  "going to suspend\n"))
1691                 return;
1692
1693         ifmgd = &sdata->u.mgd;
1694
1695         /* first process frames to avoid timing out while a frame is pending */
1696         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1697                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1698
1699         /* then process the rest of the work */
1700         mutex_lock(&ifmgd->mtx);
1701
1702         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1703                             IEEE80211_STA_CONNECTION_POLL) &&
1704             ifmgd->associated) {
1705                 u8 bssid[ETH_ALEN];
1706
1707                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1708                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1709                         run_again(ifmgd, ifmgd->probe_timeout);
1710
1711                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1712 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1713                         printk(KERN_DEBUG "No probe response from AP %pM"
1714                                 " after %dms, try %d\n", bssid,
1715                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1716                                 ifmgd->probe_send_count);
1717 #endif
1718                         ieee80211_mgd_probe_ap_send(sdata);
1719                 } else {
1720                         /*
1721                          * We actually lost the connection ... or did we?
1722                          * Let's make sure!
1723                          */
1724                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1725                                           IEEE80211_STA_BEACON_POLL);
1726                         printk(KERN_DEBUG "No probe response from AP %pM"
1727                                 " after %dms, disconnecting.\n",
1728                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1729                         ieee80211_set_disassoc(sdata, true);
1730                         ieee80211_recalc_idle(local);
1731                         mutex_unlock(&ifmgd->mtx);
1732                         /*
1733                          * must be outside lock due to cfg80211,
1734                          * but that's not a problem.
1735                          */
1736                         ieee80211_send_deauth_disassoc(sdata, bssid,
1737                                         IEEE80211_STYPE_DEAUTH,
1738                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1739                                         NULL, true);
1740                         mutex_lock(&ifmgd->mtx);
1741                 }
1742         }
1743
1744         mutex_unlock(&ifmgd->mtx);
1745 }
1746
1747 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1748 {
1749         struct ieee80211_sub_if_data *sdata =
1750                 (struct ieee80211_sub_if_data *) data;
1751         struct ieee80211_local *local = sdata->local;
1752
1753         if (local->quiescing)
1754                 return;
1755
1756         ieee80211_queue_work(&sdata->local->hw,
1757                              &sdata->u.mgd.beacon_connection_loss_work);
1758 }
1759
1760 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1761 {
1762         struct ieee80211_sub_if_data *sdata =
1763                 (struct ieee80211_sub_if_data *) data;
1764         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1765         struct ieee80211_local *local = sdata->local;
1766
1767         if (local->quiescing)
1768                 return;
1769
1770         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1771 }
1772
1773 static void ieee80211_sta_monitor_work(struct work_struct *work)
1774 {
1775         struct ieee80211_sub_if_data *sdata =
1776                 container_of(work, struct ieee80211_sub_if_data,
1777                              u.mgd.monitor_work);
1778
1779         ieee80211_mgd_probe_ap(sdata, false);
1780 }
1781
1782 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1783 {
1784         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1785                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1786                                         IEEE80211_STA_CONNECTION_POLL);
1787
1788                 /* let's probe the connection once */
1789                 ieee80211_queue_work(&sdata->local->hw,
1790                            &sdata->u.mgd.monitor_work);
1791                 /* and do all the other regular work too */
1792                 ieee80211_queue_work(&sdata->local->hw,
1793                            &sdata->u.mgd.work);
1794         }
1795 }
1796
1797 #ifdef CONFIG_PM
1798 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1799 {
1800         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1801
1802         /*
1803          * we need to use atomic bitops for the running bits
1804          * only because both timers might fire at the same
1805          * time -- the code here is properly synchronised.
1806          */
1807
1808         cancel_work_sync(&ifmgd->work);
1809         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1810         if (del_timer_sync(&ifmgd->timer))
1811                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1812
1813         cancel_work_sync(&ifmgd->chswitch_work);
1814         if (del_timer_sync(&ifmgd->chswitch_timer))
1815                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1816
1817         cancel_work_sync(&ifmgd->monitor_work);
1818         /* these will just be re-established on connection */
1819         del_timer_sync(&ifmgd->conn_mon_timer);
1820         del_timer_sync(&ifmgd->bcn_mon_timer);
1821 }
1822
1823 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1824 {
1825         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1826
1827         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1828                 add_timer(&ifmgd->timer);
1829         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1830                 add_timer(&ifmgd->chswitch_timer);
1831 }
1832 #endif
1833
1834 /* interface setup */
1835 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1836 {
1837         struct ieee80211_if_managed *ifmgd;
1838
1839         ifmgd = &sdata->u.mgd;
1840         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1841         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1842         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1843         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1844                   ieee80211_beacon_connection_loss_work);
1845         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1846                     (unsigned long) sdata);
1847         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1848                     (unsigned long) sdata);
1849         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1850                     (unsigned long) sdata);
1851         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1852                     (unsigned long) sdata);
1853         skb_queue_head_init(&ifmgd->skb_queue);
1854
1855         ifmgd->flags = 0;
1856
1857         mutex_init(&ifmgd->mtx);
1858
1859         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1860                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1861         else
1862                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1863 }
1864
1865 /* scan finished notification */
1866 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1867 {
1868         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1869
1870         /* Restart STA timers */
1871         rcu_read_lock();
1872         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1873                 ieee80211_restart_sta_timer(sdata);
1874         rcu_read_unlock();
1875 }
1876
1877 int ieee80211_max_network_latency(struct notifier_block *nb,
1878                                   unsigned long data, void *dummy)
1879 {
1880         s32 latency_usec = (s32) data;
1881         struct ieee80211_local *local =
1882                 container_of(nb, struct ieee80211_local,
1883                              network_latency_notifier);
1884
1885         mutex_lock(&local->iflist_mtx);
1886         ieee80211_recalc_ps(local, latency_usec);
1887         mutex_unlock(&local->iflist_mtx);
1888
1889         return 0;
1890 }
1891
1892 /* config hooks */
1893 static enum work_done_result
1894 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1895                           struct sk_buff *skb)
1896 {
1897         if (!skb) {
1898                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1899                 return WORK_DONE_DESTROY;
1900         }
1901
1902         if (wk->type == IEEE80211_WORK_AUTH) {
1903                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1904                 return WORK_DONE_DESTROY;
1905         }
1906
1907         mutex_lock(&wk->sdata->u.mgd.mtx);
1908         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1909         mutex_unlock(&wk->sdata->u.mgd.mtx);
1910
1911         wk->type = IEEE80211_WORK_AUTH;
1912         wk->probe_auth.tries = 0;
1913         return WORK_DONE_REQUEUE;
1914 }
1915
1916 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1917                        struct cfg80211_auth_request *req)
1918 {
1919         const u8 *ssid;
1920         struct ieee80211_work *wk;
1921         u16 auth_alg;
1922
1923         if (req->local_state_change)
1924                 return 0; /* no need to update mac80211 state */
1925
1926         switch (req->auth_type) {
1927         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1928                 auth_alg = WLAN_AUTH_OPEN;
1929                 break;
1930         case NL80211_AUTHTYPE_SHARED_KEY:
1931                 auth_alg = WLAN_AUTH_SHARED_KEY;
1932                 break;
1933         case NL80211_AUTHTYPE_FT:
1934                 auth_alg = WLAN_AUTH_FT;
1935                 break;
1936         case NL80211_AUTHTYPE_NETWORK_EAP:
1937                 auth_alg = WLAN_AUTH_LEAP;
1938                 break;
1939         default:
1940                 return -EOPNOTSUPP;
1941         }
1942
1943         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1944         if (!wk)
1945                 return -ENOMEM;
1946
1947         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1948
1949         if (req->ie && req->ie_len) {
1950                 memcpy(wk->ie, req->ie, req->ie_len);
1951                 wk->ie_len = req->ie_len;
1952         }
1953
1954         if (req->key && req->key_len) {
1955                 wk->probe_auth.key_len = req->key_len;
1956                 wk->probe_auth.key_idx = req->key_idx;
1957                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1958         }
1959
1960         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1961         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1962         wk->probe_auth.ssid_len = ssid[1];
1963
1964         wk->probe_auth.algorithm = auth_alg;
1965         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1966
1967         /* if we already have a probe, don't probe again */
1968         if (req->bss->proberesp_ies)
1969                 wk->type = IEEE80211_WORK_AUTH;
1970         else
1971                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1972         wk->chan = req->bss->channel;
1973         wk->sdata = sdata;
1974         wk->done = ieee80211_probe_auth_done;
1975
1976         ieee80211_add_work(wk);
1977         return 0;
1978 }
1979
1980 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1981                                                   struct sk_buff *skb)
1982 {
1983         struct ieee80211_mgmt *mgmt;
1984         u16 status;
1985
1986         if (!skb) {
1987                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1988                 return WORK_DONE_DESTROY;
1989         }
1990
1991         mgmt = (void *)skb->data;
1992         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1993
1994         if (status == WLAN_STATUS_SUCCESS) {
1995                 mutex_lock(&wk->sdata->u.mgd.mtx);
1996                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1997                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1998                         /* oops -- internal error -- send timeout for now */
1999                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2000                                                     wk->filter_ta);
2001                         return WORK_DONE_DESTROY;
2002                 }
2003                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2004         }
2005
2006         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2007         return WORK_DONE_DESTROY;
2008 }
2009
2010 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2011                         struct cfg80211_assoc_request *req)
2012 {
2013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2014         struct ieee80211_bss *bss = (void *)req->bss->priv;
2015         struct ieee80211_work *wk;
2016         const u8 *ssid;
2017         int i;
2018
2019         mutex_lock(&ifmgd->mtx);
2020         if (ifmgd->associated) {
2021                 if (!req->prev_bssid ||
2022                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2023                            ETH_ALEN)) {
2024                         /*
2025                          * We are already associated and the request was not a
2026                          * reassociation request from the current BSS, so
2027                          * reject it.
2028                          */
2029                         mutex_unlock(&ifmgd->mtx);
2030                         return -EALREADY;
2031                 }
2032
2033                 /* Trying to reassociate - clear previous association state */
2034                 ieee80211_set_disassoc(sdata, true);
2035         }
2036         mutex_unlock(&ifmgd->mtx);
2037
2038         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2039         if (!wk)
2040                 return -ENOMEM;
2041
2042         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2043         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2044
2045         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2046                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2047                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2048                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2049                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2050
2051
2052         if (req->ie && req->ie_len) {
2053                 memcpy(wk->ie, req->ie, req->ie_len);
2054                 wk->ie_len = req->ie_len;
2055         } else
2056                 wk->ie_len = 0;
2057
2058         wk->assoc.bss = req->bss;
2059
2060         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2061
2062         /* new association always uses requested smps mode */
2063         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2064                 if (ifmgd->powersave)
2065                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2066                 else
2067                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2068         } else
2069                 ifmgd->ap_smps = ifmgd->req_smps;
2070
2071         wk->assoc.smps = ifmgd->ap_smps;
2072         /*
2073          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2074          * We still associate in non-HT mode (11a/b/g) if any one of these
2075          * ciphers is configured as pairwise.
2076          * We can set this to true for non-11n hardware, that'll be checked
2077          * separately along with the peer capabilities.
2078          */
2079         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2080         wk->assoc.capability = req->bss->capability;
2081         wk->assoc.wmm_used = bss->wmm_used;
2082         wk->assoc.supp_rates = bss->supp_rates;
2083         wk->assoc.supp_rates_len = bss->supp_rates_len;
2084         wk->assoc.ht_information_ie =
2085                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2086
2087         if (bss->wmm_used && bss->uapsd_supported &&
2088             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2089                 wk->assoc.uapsd_used = true;
2090                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2091         } else {
2092                 wk->assoc.uapsd_used = false;
2093                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2094         }
2095
2096         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2097         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2098         wk->assoc.ssid_len = ssid[1];
2099
2100         if (req->prev_bssid)
2101                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2102
2103         wk->type = IEEE80211_WORK_ASSOC;
2104         wk->chan = req->bss->channel;
2105         wk->sdata = sdata;
2106         wk->done = ieee80211_assoc_done;
2107
2108         if (req->use_mfp) {
2109                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2110                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2111         } else {
2112                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2113                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2114         }
2115
2116         if (req->crypto.control_port)
2117                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2118         else
2119                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2120
2121         ieee80211_add_work(wk);
2122         return 0;
2123 }
2124
2125 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2126                          struct cfg80211_deauth_request *req,
2127                          void *cookie)
2128 {
2129         struct ieee80211_local *local = sdata->local;
2130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2131         struct ieee80211_work *wk;
2132         const u8 *bssid = req->bss->bssid;
2133
2134         mutex_lock(&ifmgd->mtx);
2135
2136         if (ifmgd->associated == req->bss) {
2137                 bssid = req->bss->bssid;
2138                 ieee80211_set_disassoc(sdata, true);
2139                 mutex_unlock(&ifmgd->mtx);
2140         } else {
2141                 bool not_auth_yet = false;
2142
2143                 mutex_unlock(&ifmgd->mtx);
2144
2145                 mutex_lock(&local->work_mtx);
2146                 list_for_each_entry(wk, &local->work_list, list) {
2147                         if (wk->sdata != sdata)
2148                                 continue;
2149
2150                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2151                             wk->type != IEEE80211_WORK_AUTH)
2152                                 continue;
2153
2154                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2155                                 continue;
2156
2157                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2158                         list_del_rcu(&wk->list);
2159                         free_work(wk);
2160                         break;
2161                 }
2162                 mutex_unlock(&local->work_mtx);
2163
2164                 /*
2165                  * If somebody requests authentication and we haven't
2166                  * sent out an auth frame yet there's no need to send
2167                  * out a deauth frame either. If the state was PROBE,
2168                  * then this is the case. If it's AUTH we have sent a
2169                  * frame, and if it's IDLE we have completed the auth
2170                  * process already.
2171                  */
2172                 if (not_auth_yet) {
2173                         __cfg80211_auth_canceled(sdata->dev, bssid);
2174                         return 0;
2175                 }
2176         }
2177
2178         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2179                sdata->name, bssid, req->reason_code);
2180
2181         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2182                                        req->reason_code, cookie,
2183                                        !req->local_state_change);
2184
2185         ieee80211_recalc_idle(sdata->local);
2186
2187         return 0;
2188 }
2189
2190 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2191                            struct cfg80211_disassoc_request *req,
2192                            void *cookie)
2193 {
2194         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2195         u8 bssid[ETH_ALEN];
2196
2197         mutex_lock(&ifmgd->mtx);
2198
2199         /*
2200          * cfg80211 should catch this ... but it's racy since
2201          * we can receive a disassoc frame, process it, hand it
2202          * to cfg80211 while that's in a locked section already
2203          * trying to tell us that the user wants to disconnect.
2204          */
2205         if (ifmgd->associated != req->bss) {
2206                 mutex_unlock(&ifmgd->mtx);
2207                 return -ENOLINK;
2208         }
2209
2210         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2211                sdata->name, req->bss->bssid, req->reason_code);
2212
2213         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2214         ieee80211_set_disassoc(sdata, false);
2215
2216         mutex_unlock(&ifmgd->mtx);
2217
2218         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2219                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2220                         cookie, !req->local_state_change);
2221         sta_info_destroy_addr(sdata, bssid);
2222
2223         ieee80211_recalc_idle(sdata->local);
2224
2225         return 0;
2226 }
2227
2228 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2229                          struct ieee80211_channel *chan,
2230                          enum nl80211_channel_type channel_type,
2231                          const u8 *buf, size_t len, u64 *cookie)
2232 {
2233         struct ieee80211_local *local = sdata->local;
2234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2235         struct sk_buff *skb;
2236
2237         /* Check that we are on the requested channel for transmission */
2238         if ((chan != local->tmp_channel ||
2239              channel_type != local->tmp_channel_type) &&
2240             (chan != local->oper_channel ||
2241              channel_type != local->oper_channel_type))
2242                 return -EBUSY;
2243
2244         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2245         if (!skb)
2246                 return -ENOMEM;
2247         skb_reserve(skb, local->hw.extra_tx_headroom);
2248
2249         memcpy(skb_put(skb, len), buf, len);
2250
2251         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2252                 IEEE80211_SKB_CB(skb)->flags |=
2253                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2254         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2255                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2256         skb->dev = sdata->dev;
2257         ieee80211_tx_skb(sdata, skb);
2258
2259         *cookie = (unsigned long) skb;
2260         return 0;
2261 }
2262
2263 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2264                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2265                                gfp_t gfp)
2266 {
2267         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2268
2269         trace_api_cqm_rssi_notify(sdata, rssi_event);
2270
2271         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2272 }
2273 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);