SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_MAX_PROBE_TRIES 5
  31
  32 /*
  33  * beacon loss detection timeout
  34  * XXX: should depend on beacon interval
  35  */
  36 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  37 /*
  38  * Time the connection can be idle before we probe
  39  * it to see if we can still talk to the AP.
  40  */
  41 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  42 /*
  43  * Time we wait for a probe response after sending
  44  * a probe request because of beacon loss or for
  45  * checking the connection still works.
  46  */
  47 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  48
  49 #define TMR_RUNNING_TIMER       0
  50 #define TMR_RUNNING_CHANSW      1
  51
  52 /*
  53  * All cfg80211 functions have to be called outside a locked
  54  * section so that they can acquire a lock themselves... This
  55  * is much simpler than queuing up things in cfg80211, but we
  56  * do need some indirection for that here.
  57  */
  58 enum rx_mgmt_action {
  59         /* no action required */
  60         RX_MGMT_NONE,
  61
  62         /* caller must call cfg80211_send_rx_auth() */
  63         RX_MGMT_CFG80211_AUTH,
  64
  65         /* caller must call cfg80211_send_rx_assoc() */
  66         RX_MGMT_CFG80211_ASSOC,
  67
  68         /* caller must call cfg80211_send_deauth() */
  69         RX_MGMT_CFG80211_DEAUTH,
  70
  71         /* caller must call cfg80211_send_disassoc() */
  72         RX_MGMT_CFG80211_DISASSOC,
  73
  74         /* caller must tell cfg80211 about internal error */
  75         RX_MGMT_CFG80211_ASSOC_ERROR,
  76 };
  77
  78 /* utils */
  79 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  80 {
  81         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  82 }
  83
  84 /*
  85  * We can have multiple work items (and connection probing)
  86  * scheduling this timer, but we need to take care to only
  87  * reschedule it when it should fire _earlier_ than it was
  88  * asked for before, or if it's not pending right now. This
  89  * function ensures that. Note that it then is required to
  90  * run this function for all timeouts after the first one
  91  * has happened -- the work that runs from this timer will
  92  * do that.
  93  */
  94 static void run_again(struct ieee80211_if_managed *ifmgd,
  95                              unsigned long timeout)
  96 {
  97         ASSERT_MGD_MTX(ifmgd);
  98
  99         if (!timer_pending(&ifmgd->timer) ||
 100             time_before(timeout, ifmgd->timer.expires))
 101                 mod_timer(&ifmgd->timer, timeout);
 102 }
 103
 104 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 105 {
 106         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 107                 return;
 108
 109         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 110                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 111 }
 112
 113 static int ecw2cw(int ecw)
 114 {
 115         return (1 << ecw) - 1;
 116 }
 117
 118 /*
 119  * ieee80211_enable_ht should be called only after the operating band
 120  * has been determined as ht configuration depends on the hw's
 121  * HT abilities for a specific band.
 122  */
 123 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 124                                struct ieee80211_ht_info *hti,
 125                                const u8 *bssid, u16 ap_ht_cap_flags)
 126 {
 127         struct ieee80211_local *local = sdata->local;
 128         struct ieee80211_supported_band *sband;
 129         struct sta_info *sta;
 130         u32 changed = 0;
 131         u16 ht_opmode;
 132         bool enable_ht = true, ht_changed;
 133         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 134
 135         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 136
 137         /* HT is not supported */
 138         if (!sband->ht_cap.ht_supported)
 139                 enable_ht = false;
 140
 141         /* check that channel matches the right operating channel */
 142         if (local->hw.conf.channel->center_freq !=
 143             ieee80211_channel_to_frequency(hti->control_chan))
 144                 enable_ht = false;
 145
 146         if (enable_ht) {
 147                 channel_type = NL80211_CHAN_HT20;
 148
 149                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 150                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 151                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 152                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 153                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 154                                 if (!(local->hw.conf.channel->flags &
 155                                     IEEE80211_CHAN_NO_HT40PLUS))
 156                                         channel_type = NL80211_CHAN_HT40PLUS;
 157                                 break;
 158                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 159                                 if (!(local->hw.conf.channel->flags &
 160                                     IEEE80211_CHAN_NO_HT40MINUS))
 161                                         channel_type = NL80211_CHAN_HT40MINUS;
 162                                 break;
 163                         }
 164                 }
 165         }
 166
 167         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 168                      channel_type != local->hw.conf.channel_type;
 169
 170         local->oper_channel_type = channel_type;
 171
 172         if (ht_changed) {
 173                 /* channel_type change automatically detected */
 174                 ieee80211_hw_config(local, 0);
 175
 176                 rcu_read_lock();
 177                 sta = sta_info_get(sdata, bssid);
 178                 if (sta)
 179                         rate_control_rate_update(local, sband, sta,
 180                                                  IEEE80211_RC_HT_CHANGED,
 181                                                  local->oper_channel_type);
 182                 rcu_read_unlock();
 183         }
 184
 185         /* disable HT */
 186         if (!enable_ht)
 187                 return 0;
 188
 189         ht_opmode = le16_to_cpu(hti->operation_mode);
 190
 191         /* if bss configuration changed store the new one */
 192         if (!sdata->ht_opmode_valid ||
 193             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 194                 changed |= BSS_CHANGED_HT;
 195                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 196                 sdata->ht_opmode_valid = true;
 197         }
 198
 199         return changed;
 200 }
 201
 202 /* frame sending functions */
 203
 204 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 205                                            const u8 *bssid, u16 stype, u16 reason,
 206                                            void *cookie)
 207 {
 208         struct ieee80211_local *local = sdata->local;
 209         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 210         struct sk_buff *skb;
 211         struct ieee80211_mgmt *mgmt;
 212
 213         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 214         if (!skb) {
 215                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 216                        "deauth/disassoc frame\n", sdata->name);
 217                 return;
 218         }
 219         skb_reserve(skb, local->hw.extra_tx_headroom);
 220
 221         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 222         memset(mgmt, 0, 24);
 223         memcpy(mgmt->da, bssid, ETH_ALEN);
 224         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 225         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 226         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 227         skb_put(skb, 2);
 228         /* u.deauth.reason_code == u.disassoc.reason_code */
 229         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 230
 231         if (stype == IEEE80211_STYPE_DEAUTH)
 232                 if (cookie)
 233                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 234                 else
 235                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 236         else
 237                 if (cookie)
 238                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 239                 else
 240                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 241         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 242                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 243         ieee80211_tx_skb(sdata, skb);
 244 }
 245
 246 void ieee80211_send_pspoll(struct ieee80211_local *local,
 247                            struct ieee80211_sub_if_data *sdata)
 248 {
 249         struct ieee80211_pspoll *pspoll;
 250         struct sk_buff *skb;
 251
 252         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 253         if (!skb)
 254                 return;
 255
 256         pspoll = (struct ieee80211_pspoll *) skb->data;
 257         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 258
 259         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 260         ieee80211_tx_skb(sdata, skb);
 261 }
 262
 263 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 264                              struct ieee80211_sub_if_data *sdata,
 265                              int powersave)
 266 {
 267         struct sk_buff *skb;
 268         struct ieee80211_hdr_3addr *nullfunc;
 269
 270         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 271         if (!skb)
 272                 return;
 273
 274         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 275         if (powersave)
 276                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 277
 278         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 279         ieee80211_tx_skb(sdata, skb);
 280 }
 281
 282 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 283                                           struct ieee80211_sub_if_data *sdata)
 284 {
 285         struct sk_buff *skb;
 286         struct ieee80211_hdr *nullfunc;
 287         __le16 fc;
 288
 289         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 290                 return;
 291
 292         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 293         if (!skb) {
 294                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 295                        "nullfunc frame\n", sdata->name);
 296                 return;
 297         }
 298         skb_reserve(skb, local->hw.extra_tx_headroom);
 299
 300         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 301         memset(nullfunc, 0, 30);
 302         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 303                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 304         nullfunc->frame_control = fc;
 305         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 306         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 307         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 308         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 309
 310         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 311         ieee80211_tx_skb(sdata, skb);
 312 }
 313
 314 /* spectrum management related things */
 315 static void ieee80211_chswitch_work(struct work_struct *work)
 316 {
 317         struct ieee80211_sub_if_data *sdata =
 318                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 319         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 320
 321         if (!ieee80211_sdata_running(sdata))
 322                 return;
 323
 324         mutex_lock(&ifmgd->mtx);
 325         if (!ifmgd->associated)
 326                 goto out;
 327
 328         sdata->local->oper_channel = sdata->local->csa_channel;
 329         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 330
 331         /* XXX: shouldn't really modify cfg80211-owned data! */
 332         ifmgd->associated->channel = sdata->local->oper_channel;
 333
 334         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 335                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 336  out:
 337         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 338         mutex_unlock(&ifmgd->mtx);
 339 }
 340
 341 static void ieee80211_chswitch_timer(unsigned long data)
 342 {
 343         struct ieee80211_sub_if_data *sdata =
 344                 (struct ieee80211_sub_if_data *) data;
 345         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 346
 347         if (sdata->local->quiescing) {
 348                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 349                 return;
 350         }
 351
 352         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 353 }
 354
 355 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 356                                       struct ieee80211_channel_sw_ie *sw_elem,
 357                                       struct ieee80211_bss *bss)
 358 {
 359         struct cfg80211_bss *cbss =
 360                 container_of((void *)bss, struct cfg80211_bss, priv);
 361         struct ieee80211_channel *new_ch;
 362         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 363         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 364
 365         ASSERT_MGD_MTX(ifmgd);
 366
 367         if (!ifmgd->associated)
 368                 return;
 369
 370         if (sdata->local->scanning)
 371                 return;
 372
 373         /* Disregard subsequent beacons if we are already running a timer
 374            processing a CSA */
 375
 376         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 377                 return;
 378
 379         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 380         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 381                 return;
 382
 383         sdata->local->csa_channel = new_ch;
 384
 385         if (sw_elem->count <= 1) {
 386                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 387         } else {
 388                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 389                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 390                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 391                 mod_timer(&ifmgd->chswitch_timer,
 392                           jiffies +
 393                           msecs_to_jiffies(sw_elem->count *
 394                                            cbss->beacon_interval));
 395         }
 396 }
 397
 398 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 399                                         u16 capab_info, u8 *pwr_constr_elem,
 400                                         u8 pwr_constr_elem_len)
 401 {
 402         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 403
 404         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 405                 return;
 406
 407         /* Power constraint IE length should be 1 octet */
 408         if (pwr_constr_elem_len != 1)
 409                 return;
 410
 411         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 412             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 413                 sdata->local->power_constr_level = *pwr_constr_elem;
 414                 ieee80211_hw_config(sdata->local, 0);
 415         }
 416 }
 417
 418 /* powersave */
 419 static void ieee80211_enable_ps(struct ieee80211_local *local,
 420                                 struct ieee80211_sub_if_data *sdata)
 421 {
 422         struct ieee80211_conf *conf = &local->hw.conf;
 423
 424         /*
 425          * If we are scanning right now then the parameters will
 426          * take effect when scan finishes.
 427          */
 428         if (local->scanning)
 429                 return;
 430
 431         if (conf->dynamic_ps_timeout > 0 &&
 432             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 433                 mod_timer(&local->dynamic_ps_timer, jiffies +
 434                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 435         } else {
 436                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 437                         ieee80211_send_nullfunc(local, sdata, 1);
 438
 439                 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
 440                         conf->flags |= IEEE80211_CONF_PS;
 441                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 442                 }
 443         }
 444 }
 445
 446 static void ieee80211_change_ps(struct ieee80211_local *local)
 447 {
 448         struct ieee80211_conf *conf = &local->hw.conf;
 449
 450         if (local->ps_sdata) {
 451                 ieee80211_enable_ps(local, local->ps_sdata);
 452         } else if (conf->flags & IEEE80211_CONF_PS) {
 453                 conf->flags &= ~IEEE80211_CONF_PS;
 454                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 455                 del_timer_sync(&local->dynamic_ps_timer);
 456                 cancel_work_sync(&local->dynamic_ps_enable_work);
 457         }
 458 }
 459
 460 /* need to hold RTNL or interface lock */
 461 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 462 {
 463         struct ieee80211_sub_if_data *sdata, *found = NULL;
 464         int count = 0;
 465
 466         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 467                 local->ps_sdata = NULL;
 468                 return;
 469         }
 470
 471         if (!list_empty(&local->work_list)) {
 472                 local->ps_sdata = NULL;
 473                 goto change;
 474         }
 475
 476         list_for_each_entry(sdata, &local->interfaces, list) {
 477                 if (!ieee80211_sdata_running(sdata))
 478                         continue;
 479                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 480                         continue;
 481                 found = sdata;
 482                 count++;
 483         }
 484
 485         if (count == 1 && found->u.mgd.powersave &&
 486             found->u.mgd.associated &&
 487             found->u.mgd.associated->beacon_ies &&
 488             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 489                                     IEEE80211_STA_CONNECTION_POLL))) {
 490                 s32 beaconint_us;
 491
 492                 if (latency < 0)
 493                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 494
 495                 beaconint_us = ieee80211_tu_to_usec(
 496                                         found->vif.bss_conf.beacon_int);
 497
 498                 if (beaconint_us > latency) {
 499                         local->ps_sdata = NULL;
 500                 } else {
 501                         struct ieee80211_bss *bss;
 502                         int maxslp = 1;
 503                         u8 dtimper;
 504
 505                         bss = (void *)found->u.mgd.associated->priv;
 506                         dtimper = bss->dtim_period;
 507
 508                         /* If the TIM IE is invalid, pretend the value is 1 */
 509                         if (!dtimper)
 510                                 dtimper = 1;
 511                         else if (dtimper > 1)
 512                                 maxslp = min_t(int, dtimper,
 513                                                     latency / beaconint_us);
 514
 515                         local->hw.conf.max_sleep_period = maxslp;
 516                         local->hw.conf.ps_dtim_period = dtimper;
 517                         local->ps_sdata = found;
 518                 }
 519         } else {
 520                 local->ps_sdata = NULL;
 521         }
 522
 523  change:
 524         ieee80211_change_ps(local);
 525 }
 526
 527 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 528 {
 529         struct ieee80211_local *local =
 530                 container_of(work, struct ieee80211_local,
 531                              dynamic_ps_disable_work);
 532
 533         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 534                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 535                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 536         }
 537
 538         ieee80211_wake_queues_by_reason(&local->hw,
 539                                         IEEE80211_QUEUE_STOP_REASON_PS);
 540 }
 541
 542 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 543 {
 544         struct ieee80211_local *local =
 545                 container_of(work, struct ieee80211_local,
 546                              dynamic_ps_enable_work);
 547         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 548         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 549
 550         /* can only happen when PS was just disabled anyway */
 551         if (!sdata)
 552                 return;
 553
 554         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 555                 return;
 556
 557         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 558             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 559                 ieee80211_send_nullfunc(local, sdata, 1);
 560
 561         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
 562             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 563                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 564                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 565                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 566         }
 567 }
 568
 569 void ieee80211_dynamic_ps_timer(unsigned long data)
 570 {
 571         struct ieee80211_local *local = (void *) data;
 572
 573         if (local->quiescing || local->suspended)
 574                 return;
 575
 576         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 577 }
 578
 579 /* MLME */
 580 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 581                                      struct ieee80211_if_managed *ifmgd,
 582                                      u8 *wmm_param, size_t wmm_param_len)
 583 {
 584         struct ieee80211_tx_queue_params params;
 585         size_t left;
 586         int count;
 587         u8 *pos, uapsd_queues = 0;
 588
 589         if (local->hw.queues < 4)
 590                 return;
 591
 592         if (!wmm_param)
 593                 return;
 594
 595         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 596                 return;
 597
 598         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 599                 uapsd_queues = local->uapsd_queues;
 600
 601         count = wmm_param[6] & 0x0f;
 602         if (count == ifmgd->wmm_last_param_set)
 603                 return;
 604         ifmgd->wmm_last_param_set = count;
 605
 606         pos = wmm_param + 8;
 607         left = wmm_param_len - 8;
 608
 609         memset(&params, 0, sizeof(params));
 610
 611         local->wmm_acm = 0;
 612         for (; left >= 4; left -= 4, pos += 4) {
 613                 int aci = (pos[0] >> 5) & 0x03;
 614                 int acm = (pos[0] >> 4) & 0x01;
 615                 bool uapsd = false;
 616                 int queue;
 617
 618                 switch (aci) {
 619                 case 1: /* AC_BK */
 620                         queue = 3;
 621                         if (acm)
 622                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 623                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 624                                 uapsd = true;
 625                         break;
 626                 case 2: /* AC_VI */
 627                         queue = 1;
 628                         if (acm)
 629                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 630                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 631                                 uapsd = true;
 632                         break;
 633                 case 3: /* AC_VO */
 634                         queue = 0;
 635                         if (acm)
 636                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 637                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 638                                 uapsd = true;
 639                         break;
 640                 case 0: /* AC_BE */
 641                 default:
 642                         queue = 2;
 643                         if (acm)
 644                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 645                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 646                                 uapsd = true;
 647                         break;
 648                 }
 649
 650                 params.aifs = pos[0] & 0x0f;
 651                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 652                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 653                 params.txop = get_unaligned_le16(pos + 2);
 654                 params.uapsd = uapsd;
 655
 656 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 657                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 658                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 659                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 660                        params.aifs, params.cw_min, params.cw_max, params.txop,
 661                        params.uapsd);
 662 #endif
 663                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 664                         printk(KERN_DEBUG "%s: failed to set TX queue "
 665                                "parameters for queue %d\n",
 666                                wiphy_name(local->hw.wiphy), queue);
 667         }
 668 }
 669
 670 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 671                                            u16 capab, bool erp_valid, u8 erp)
 672 {
 673         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 674         u32 changed = 0;
 675         bool use_protection;
 676         bool use_short_preamble;
 677         bool use_short_slot;
 678
 679         if (erp_valid) {
 680                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 681                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 682         } else {
 683                 use_protection = false;
 684                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 685         }
 686
 687         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 688         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 689                 use_short_slot = true;
 690
 691         if (use_protection != bss_conf->use_cts_prot) {
 692                 bss_conf->use_cts_prot = use_protection;
 693                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 694         }
 695
 696         if (use_short_preamble != bss_conf->use_short_preamble) {
 697                 bss_conf->use_short_preamble = use_short_preamble;
 698                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 699         }
 700
 701         if (use_short_slot != bss_conf->use_short_slot) {
 702                 bss_conf->use_short_slot = use_short_slot;
 703                 changed |= BSS_CHANGED_ERP_SLOT;
 704         }
 705
 706         return changed;
 707 }
 708
 709 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 710                                      struct cfg80211_bss *cbss,
 711                                      u32 bss_info_changed)
 712 {
 713         struct ieee80211_bss *bss = (void *)cbss->priv;
 714         struct ieee80211_local *local = sdata->local;
 715
 716         bss_info_changed |= BSS_CHANGED_ASSOC;
 717         /* set timing information */
 718         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 719         sdata->vif.bss_conf.timestamp = cbss->tsf;
 720
 721         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 722         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 723                 cbss->capability, bss->has_erp_value, bss->erp_value);
 724
 725         sdata->u.mgd.associated = cbss;
 726         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 727
 728         /* just to be sure */
 729         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 730                                 IEEE80211_STA_BEACON_POLL);
 731
 732         /*
 733          * Always handle WMM once after association regardless
 734          * of the first value the AP uses. Setting -1 here has
 735          * that effect because the AP values is an unsigned
 736          * 4-bit value.
 737          */
 738         sdata->u.mgd.wmm_last_param_set = -1;
 739
 740         ieee80211_led_assoc(local, 1);
 741
 742         sdata->vif.bss_conf.assoc = 1;
 743         /*
 744          * For now just always ask the driver to update the basic rateset
 745          * when we have associated, we aren't checking whether it actually
 746          * changed or not.
 747          */
 748         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 749
 750         /* And the BSSID changed - we're associated now */
 751         bss_info_changed |= BSS_CHANGED_BSSID;
 752
 753         /* Tell the driver to monitor connection quality (if supported) */
 754         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 755             sdata->vif.bss_conf.cqm_rssi_thold)
 756                 bss_info_changed |= BSS_CHANGED_CQM;
 757
 758         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 759
 760         mutex_lock(&local->iflist_mtx);
 761         ieee80211_recalc_ps(local, -1);
 762         ieee80211_recalc_smps(local, sdata);
 763         mutex_unlock(&local->iflist_mtx);
 764
 765         netif_tx_start_all_queues(sdata->dev);
 766         netif_carrier_on(sdata->dev);
 767 }
 768
 769 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 770 {
 771         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 772         struct ieee80211_local *local = sdata->local;
 773         struct sta_info *sta;
 774         u32 changed = 0, config_changed = 0;
 775         u8 bssid[ETH_ALEN];
 776
 777         ASSERT_MGD_MTX(ifmgd);
 778
 779         if (WARN_ON(!ifmgd->associated))
 780                 return;
 781
 782         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 783
 784         ifmgd->associated = NULL;
 785         memset(ifmgd->bssid, 0, ETH_ALEN);
 786
 787         /*
 788          * we need to commit the associated = NULL change because the
 789          * scan code uses that to determine whether this iface should
 790          * go to/wake up from powersave or not -- and could otherwise
 791          * wake the queues erroneously.
 792          */
 793         smp_mb();
 794
 795         /*
 796          * Thus, we can only afterwards stop the queues -- to account
 797          * for the case where another CPU is finishing a scan at this
 798          * time -- we don't want the scan code to enable queues.
 799          */
 800
 801         netif_tx_stop_all_queues(sdata->dev);
 802         netif_carrier_off(sdata->dev);
 803
 804         rcu_read_lock();
 805         sta = sta_info_get(sdata, bssid);
 806         if (sta) {
 807                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 808                 ieee80211_sta_tear_down_BA_sessions(sta);
 809         }
 810         rcu_read_unlock();
 811
 812         changed |= ieee80211_reset_erp_info(sdata);
 813
 814         ieee80211_led_assoc(local, 0);
 815         changed |= BSS_CHANGED_ASSOC;
 816         sdata->vif.bss_conf.assoc = false;
 817
 818         ieee80211_set_wmm_default(sdata);
 819
 820         /* channel(_type) changes are handled by ieee80211_hw_config */
 821         local->oper_channel_type = NL80211_CHAN_NO_HT;
 822
 823         /* on the next assoc, re-program HT parameters */
 824         sdata->ht_opmode_valid = false;
 825
 826         local->power_constr_level = 0;
 827
 828         del_timer_sync(&local->dynamic_ps_timer);
 829         cancel_work_sync(&local->dynamic_ps_enable_work);
 830
 831         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 832                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 833                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 834         }
 835
 836         ieee80211_hw_config(local, config_changed);
 837
 838         /* And the BSSID changed -- not very interesting here */
 839         changed |= BSS_CHANGED_BSSID;
 840         ieee80211_bss_info_change_notify(sdata, changed);
 841
 842         sta_info_destroy_addr(sdata, bssid);
 843 }
 844
 845 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 846                              struct ieee80211_hdr *hdr)
 847 {
 848         /*
 849          * We can postpone the mgd.timer whenever receiving unicast frames
 850          * from AP because we know that the connection is working both ways
 851          * at that time. But multicast frames (and hence also beacons) must
 852          * be ignored here, because we need to trigger the timer during
 853          * data idle periods for sending the periodic probe request to the
 854          * AP we're connected to.
 855          */
 856         if (is_multicast_ether_addr(hdr->addr1))
 857                 return;
 858
 859         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 860                 return;
 861
 862         mod_timer(&sdata->u.mgd.conn_mon_timer,
 863                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 864 }
 865
 866 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 867 {
 868         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 869         const u8 *ssid;
 870
 871         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 872         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 873                                  ssid + 2, ssid[1], NULL, 0);
 874
 875         ifmgd->probe_send_count++;
 876         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 877         run_again(ifmgd, ifmgd->probe_timeout);
 878 }
 879
 880 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 881                                    bool beacon)
 882 {
 883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 884         bool already = false;
 885
 886         if (!ieee80211_sdata_running(sdata))
 887                 return;
 888
 889         if (sdata->local->scanning)
 890                 return;
 891
 892         if (sdata->local->tmp_channel)
 893                 return;
 894
 895         mutex_lock(&ifmgd->mtx);
 896
 897         if (!ifmgd->associated)
 898                 goto out;
 899
 900 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 901         if (beacon && net_ratelimit())
 902                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 903                        "- sending probe request\n", sdata->name);
 904 #endif
 905
 906         /*
 907          * The driver/our work has already reported this event or the
 908          * connection monitoring has kicked in and we have already sent
 909          * a probe request. Or maybe the AP died and the driver keeps
 910          * reporting until we disassociate...
 911          *
 912          * In either case we have to ignore the current call to this
 913          * function (except for setting the correct probe reason bit)
 914          * because otherwise we would reset the timer every time and
 915          * never check whether we received a probe response!
 916          */
 917         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 918                             IEEE80211_STA_CONNECTION_POLL))
 919                 already = true;
 920
 921         if (beacon)
 922                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 923         else
 924                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 925
 926         if (already)
 927                 goto out;
 928
 929         mutex_lock(&sdata->local->iflist_mtx);
 930         ieee80211_recalc_ps(sdata->local, -1);
 931         mutex_unlock(&sdata->local->iflist_mtx);
 932
 933         ifmgd->probe_send_count = 0;
 934         ieee80211_mgd_probe_ap_send(sdata);
 935  out:
 936         mutex_unlock(&ifmgd->mtx);
 937 }
 938
 939 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 940 {
 941         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 942         struct ieee80211_local *local = sdata->local;
 943         u8 bssid[ETH_ALEN];
 944
 945         mutex_lock(&ifmgd->mtx);
 946         if (!ifmgd->associated) {
 947                 mutex_unlock(&ifmgd->mtx);
 948                 return;
 949         }
 950
 951         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 952
 953         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
 954
 955         ieee80211_set_disassoc(sdata);
 956         ieee80211_recalc_idle(local);
 957         mutex_unlock(&ifmgd->mtx);
 958         /*
 959          * must be outside lock due to cfg80211,
 960          * but that's not a problem.
 961          */
 962         ieee80211_send_deauth_disassoc(sdata, bssid,
 963                                        IEEE80211_STYPE_DEAUTH,
 964                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
 965                                        NULL);
 966 }
 967
 968 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
 969 {
 970         struct ieee80211_sub_if_data *sdata =
 971                 container_of(work, struct ieee80211_sub_if_data,
 972                              u.mgd.beacon_connection_loss_work);
 973
 974         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 975                 __ieee80211_connection_loss(sdata);
 976         else
 977                 ieee80211_mgd_probe_ap(sdata, true);
 978 }
 979
 980 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 981 {
 982         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 983         struct ieee80211_hw *hw = &sdata->local->hw;
 984
 985         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
 986         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
 987 }
 988 EXPORT_SYMBOL(ieee80211_beacon_loss);
 989
 990 void ieee80211_connection_loss(struct ieee80211_vif *vif)
 991 {
 992         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 993         struct ieee80211_hw *hw = &sdata->local->hw;
 994
 995         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
 996         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
 997 }
 998 EXPORT_SYMBOL(ieee80211_connection_loss);
 999
1000
1001 static enum rx_mgmt_action __must_check
1002 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1003                          struct ieee80211_mgmt *mgmt, size_t len)
1004 {
1005         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1006         const u8 *bssid = NULL;
1007         u16 reason_code;
1008
1009         if (len < 24 + 2)
1010                 return RX_MGMT_NONE;
1011
1012         ASSERT_MGD_MTX(ifmgd);
1013
1014         bssid = ifmgd->associated->bssid;
1015
1016         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1017
1018         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1019                         sdata->name, bssid, reason_code);
1020
1021         ieee80211_set_disassoc(sdata);
1022         ieee80211_recalc_idle(sdata->local);
1023
1024         return RX_MGMT_CFG80211_DEAUTH;
1025 }
1026
1027
1028 static enum rx_mgmt_action __must_check
1029 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1030                            struct ieee80211_mgmt *mgmt, size_t len)
1031 {
1032         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1033         u16 reason_code;
1034
1035         if (len < 24 + 2)
1036                 return RX_MGMT_NONE;
1037
1038         ASSERT_MGD_MTX(ifmgd);
1039
1040         if (WARN_ON(!ifmgd->associated))
1041                 return RX_MGMT_NONE;
1042
1043         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1044                 return RX_MGMT_NONE;
1045
1046         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1047
1048         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1049                         sdata->name, mgmt->sa, reason_code);
1050
1051         ieee80211_set_disassoc(sdata);
1052         ieee80211_recalc_idle(sdata->local);
1053         return RX_MGMT_CFG80211_DISASSOC;
1054 }
1055
1056
1057 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1058                                     struct ieee80211_mgmt *mgmt, size_t len)
1059 {
1060         struct ieee80211_sub_if_data *sdata = wk->sdata;
1061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1062         struct ieee80211_local *local = sdata->local;
1063         struct ieee80211_supported_band *sband;
1064         struct sta_info *sta;
1065         struct cfg80211_bss *cbss = wk->assoc.bss;
1066         u8 *pos;
1067         u32 rates, basic_rates;
1068         u16 capab_info, aid;
1069         struct ieee802_11_elems elems;
1070         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1071         u32 changed = 0;
1072         int i, j, err;
1073         bool have_higher_than_11mbit = false;
1074         u16 ap_ht_cap_flags;
1075
1076         /* AssocResp and ReassocResp have identical structure */
1077
1078         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1079         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1080
1081         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1082                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1083                        "set\n", sdata->name, aid);
1084         aid &= ~(BIT(15) | BIT(14));
1085
1086         pos = mgmt->u.assoc_resp.variable;
1087         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1088
1089         if (!elems.supp_rates) {
1090                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1091                        sdata->name);
1092                 return false;
1093         }
1094
1095         ifmgd->aid = aid;
1096
1097         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1098         if (!sta) {
1099                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1100                        " the AP\n", sdata->name);
1101                 return false;
1102         }
1103
1104         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1105                            WLAN_STA_ASSOC_AP);
1106         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1107                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1108
1109         rates = 0;
1110         basic_rates = 0;
1111         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1112
1113         for (i = 0; i < elems.supp_rates_len; i++) {
1114                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1115                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1116
1117                 if (rate > 110)
1118                         have_higher_than_11mbit = true;
1119
1120                 for (j = 0; j < sband->n_bitrates; j++) {
1121                         if (sband->bitrates[j].bitrate == rate) {
1122                                 rates |= BIT(j);
1123                                 if (is_basic)
1124                                         basic_rates |= BIT(j);
1125                                 break;
1126                         }
1127                 }
1128         }
1129
1130         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1131                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1132                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1133
1134                 if (rate > 110)
1135                         have_higher_than_11mbit = true;
1136
1137                 for (j = 0; j < sband->n_bitrates; j++) {
1138                         if (sband->bitrates[j].bitrate == rate) {
1139                                 rates |= BIT(j);
1140                                 if (is_basic)
1141                                         basic_rates |= BIT(j);
1142                                 break;
1143                         }
1144                 }
1145         }
1146
1147         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1148         sdata->vif.bss_conf.basic_rates = basic_rates;
1149
1150         /* cf. IEEE 802.11 9.2.12 */
1151         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1152             have_higher_than_11mbit)
1153                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1154         else
1155                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1156
1157         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1158                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1159                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1160
1161         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1162
1163         rate_control_rate_init(sta);
1164
1165         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1166                 set_sta_flags(sta, WLAN_STA_MFP);
1167
1168         if (elems.wmm_param)
1169                 set_sta_flags(sta, WLAN_STA_WME);
1170
1171         err = sta_info_insert(sta);
1172         sta = NULL;
1173         if (err) {
1174                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1175                        " the AP (error %d)\n", sdata->name, err);
1176                 return false;
1177         }
1178
1179         if (elems.wmm_param)
1180                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1181                                          elems.wmm_param_len);
1182         else
1183                 ieee80211_set_wmm_default(sdata);
1184
1185         local->oper_channel = wk->chan;
1186
1187         if (elems.ht_info_elem && elems.wmm_param &&
1188             (sdata->local->hw.queues >= 4) &&
1189             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1190                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1191                                                cbss->bssid, ap_ht_cap_flags);
1192
1193         /* set AID and assoc capability,
1194          * ieee80211_set_associated() will tell the driver */
1195         bss_conf->aid = aid;
1196         bss_conf->assoc_capability = capab_info;
1197         ieee80211_set_associated(sdata, cbss, changed);
1198
1199         /*
1200          * If we're using 4-addr mode, let the AP know that we're
1201          * doing so, so that it can create the STA VLAN on its side
1202          */
1203         if (ifmgd->use_4addr)
1204                 ieee80211_send_4addr_nullfunc(local, sdata);
1205
1206         /*
1207          * Start timer to probe the connection to the AP now.
1208          * Also start the timer that will detect beacon loss.
1209          */
1210         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1211         mod_beacon_timer(sdata);
1212
1213         return true;
1214 }
1215
1216
1217 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1218                                   struct ieee80211_mgmt *mgmt,
1219                                   size_t len,
1220                                   struct ieee80211_rx_status *rx_status,
1221                                   struct ieee802_11_elems *elems,
1222                                   bool beacon)
1223 {
1224         struct ieee80211_local *local = sdata->local;
1225         int freq;
1226         struct ieee80211_bss *bss;
1227         struct ieee80211_channel *channel;
1228         bool need_ps = false;
1229
1230         if (sdata->u.mgd.associated) {
1231                 bss = (void *)sdata->u.mgd.associated->priv;
1232                 /* not previously set so we may need to recalc */
1233                 need_ps = !bss->dtim_period;
1234         }
1235
1236         if (elems->ds_params && elems->ds_params_len == 1)
1237                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1238         else
1239                 freq = rx_status->freq;
1240
1241         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1242
1243         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1244                 return;
1245
1246         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1247                                         channel, beacon);
1248         if (bss)
1249                 ieee80211_rx_bss_put(local, bss);
1250
1251         if (!sdata->u.mgd.associated)
1252                 return;
1253
1254         if (need_ps) {
1255                 mutex_lock(&local->iflist_mtx);
1256                 ieee80211_recalc_ps(local, -1);
1257                 mutex_unlock(&local->iflist_mtx);
1258         }
1259
1260         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1261             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1262                                                         ETH_ALEN) == 0)) {
1263                 struct ieee80211_channel_sw_ie *sw_elem =
1264                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1265                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1266         }
1267 }
1268
1269
1270 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1271                                          struct sk_buff *skb)
1272 {
1273         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1274         struct ieee80211_if_managed *ifmgd;
1275         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1276         size_t baselen, len = skb->len;
1277         struct ieee802_11_elems elems;
1278
1279         ifmgd = &sdata->u.mgd;
1280
1281         ASSERT_MGD_MTX(ifmgd);
1282
1283         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1284                 return; /* ignore ProbeResp to foreign address */
1285
1286         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1287         if (baselen > len)
1288                 return;
1289
1290         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1291                                 &elems);
1292
1293         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1294
1295         if (ifmgd->associated &&
1296             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1297             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1298                             IEEE80211_STA_CONNECTION_POLL)) {
1299                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1300                                   IEEE80211_STA_BEACON_POLL);
1301                 mutex_lock(&sdata->local->iflist_mtx);
1302                 ieee80211_recalc_ps(sdata->local, -1);
1303                 mutex_unlock(&sdata->local->iflist_mtx);
1304                 /*
1305                  * We've received a probe response, but are not sure whether
1306                  * we have or will be receiving any beacons or data, so let's
1307                  * schedule the timers again, just in case.
1308                  */
1309                 mod_beacon_timer(sdata);
1310                 mod_timer(&ifmgd->conn_mon_timer,
1311                           round_jiffies_up(jiffies +
1312                                            IEEE80211_CONNECTION_IDLE_TIME));
1313         }
1314 }
1315
1316 /*
1317  * This is the canonical list of information elements we care about,
1318  * the filter code also gives us all changes to the Microsoft OUI
1319  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1320  *
1321  * We implement beacon filtering in software since that means we can
1322  * avoid processing the frame here and in cfg80211, and userspace
1323  * will not be able to tell whether the hardware supports it or not.
1324  *
1325  * XXX: This list needs to be dynamic -- userspace needs to be able to
1326  *      add items it requires. It also needs to be able to tell us to
1327  *      look out for other vendor IEs.
1328  */
1329 static const u64 care_about_ies =
1330         (1ULL << WLAN_EID_COUNTRY) |
1331         (1ULL << WLAN_EID_ERP_INFO) |
1332         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1333         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1334         (1ULL << WLAN_EID_HT_CAPABILITY) |
1335         (1ULL << WLAN_EID_HT_INFORMATION);
1336
1337 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1338                                      struct ieee80211_mgmt *mgmt,
1339                                      size_t len,
1340                                      struct ieee80211_rx_status *rx_status)
1341 {
1342         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1343         size_t baselen;
1344         struct ieee802_11_elems elems;
1345         struct ieee80211_local *local = sdata->local;
1346         u32 changed = 0;
1347         bool erp_valid, directed_tim = false;
1348         u8 erp_value = 0;
1349         u32 ncrc;
1350         u8 *bssid;
1351
1352         ASSERT_MGD_MTX(ifmgd);
1353
1354         /* Process beacon from the current BSS */
1355         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1356         if (baselen > len)
1357                 return;
1358
1359         if (rx_status->freq != local->hw.conf.channel->center_freq)
1360                 return;
1361
1362         /*
1363          * We might have received a number of frames, among them a
1364          * disassoc frame and a beacon...
1365          */
1366         if (!ifmgd->associated)
1367                 return;
1368
1369         bssid = ifmgd->associated->bssid;
1370
1371         /*
1372          * And in theory even frames from a different AP we were just
1373          * associated to a split-second ago!
1374          */
1375         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1376                 return;
1377
1378         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1379 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1380                 if (net_ratelimit()) {
1381                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1382                                "to a received beacon\n", sdata->name);
1383                 }
1384 #endif
1385                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1386                 mutex_lock(&local->iflist_mtx);
1387                 ieee80211_recalc_ps(local, -1);
1388                 mutex_unlock(&local->iflist_mtx);
1389         }
1390
1391         /*
1392          * Push the beacon loss detection into the future since
1393          * we are processing a beacon from the AP just now.
1394          */
1395         mod_beacon_timer(sdata);
1396
1397         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1398         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1399                                           len - baselen, &elems,
1400                                           care_about_ies, ncrc);
1401
1402         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1403                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1404                                                    ifmgd->aid);
1405
1406         if (ncrc != ifmgd->beacon_crc) {
1407                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1408                                       true);
1409
1410                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1411                                          elems.wmm_param_len);
1412         }
1413
1414         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1415                 if (directed_tim) {
1416                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1417                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1418                                 ieee80211_hw_config(local,
1419                                                     IEEE80211_CONF_CHANGE_PS);
1420                                 ieee80211_send_nullfunc(local, sdata, 0);
1421                         } else {
1422                                 local->pspolling = true;
1423
1424                                 /*
1425                                  * Here is assumed that the driver will be
1426                                  * able to send ps-poll frame and receive a
1427                                  * response even though power save mode is
1428                                  * enabled, but some drivers might require
1429                                  * to disable power save here. This needs
1430                                  * to be investigated.
1431                                  */
1432                                 ieee80211_send_pspoll(local, sdata);
1433                         }
1434                 }
1435         }
1436
1437         if (ncrc == ifmgd->beacon_crc)
1438                 return;
1439         ifmgd->beacon_crc = ncrc;
1440
1441         if (elems.erp_info && elems.erp_info_len >= 1) {
1442                 erp_valid = true;
1443                 erp_value = elems.erp_info[0];
1444         } else {
1445                 erp_valid = false;
1446         }
1447         changed |= ieee80211_handle_bss_capability(sdata,
1448                         le16_to_cpu(mgmt->u.beacon.capab_info),
1449                         erp_valid, erp_value);
1450
1451
1452         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1453             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1454                 struct sta_info *sta;
1455                 struct ieee80211_supported_band *sband;
1456                 u16 ap_ht_cap_flags;
1457
1458                 rcu_read_lock();
1459
1460                 sta = sta_info_get(sdata, bssid);
1461                 if (WARN_ON(!sta)) {
1462                         rcu_read_unlock();
1463                         return;
1464                 }
1465
1466                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1467
1468                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1469                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1470
1471                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1472
1473                 rcu_read_unlock();
1474
1475                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1476                                                bssid, ap_ht_cap_flags);
1477         }
1478
1479         /* Note: country IE parsing is done for us by cfg80211 */
1480         if (elems.country_elem) {
1481                 /* TODO: IBSS also needs this */
1482                 if (elems.pwr_constr_elem)
1483                         ieee80211_handle_pwr_constr(sdata,
1484                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1485                                 elems.pwr_constr_elem,
1486                                 elems.pwr_constr_elem_len);
1487         }
1488
1489         ieee80211_bss_info_change_notify(sdata, changed);
1490 }
1491
1492 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1493                                           struct sk_buff *skb)
1494 {
1495         struct ieee80211_local *local = sdata->local;
1496         struct ieee80211_mgmt *mgmt;
1497         u16 fc;
1498
1499         if (skb->len < 24)
1500                 return RX_DROP_MONITOR;
1501
1502         mgmt = (struct ieee80211_mgmt *) skb->data;
1503         fc = le16_to_cpu(mgmt->frame_control);
1504
1505         switch (fc & IEEE80211_FCTL_STYPE) {
1506         case IEEE80211_STYPE_PROBE_RESP:
1507         case IEEE80211_STYPE_BEACON:
1508         case IEEE80211_STYPE_DEAUTH:
1509         case IEEE80211_STYPE_DISASSOC:
1510         case IEEE80211_STYPE_ACTION:
1511                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1512                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1513                 return RX_QUEUED;
1514         }
1515
1516         return RX_DROP_MONITOR;
1517 }
1518
1519 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1520                                          struct sk_buff *skb)
1521 {
1522         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1523         struct ieee80211_rx_status *rx_status;
1524         struct ieee80211_mgmt *mgmt;
1525         enum rx_mgmt_action rma = RX_MGMT_NONE;
1526         u16 fc;
1527
1528         rx_status = (struct ieee80211_rx_status *) skb->cb;
1529         mgmt = (struct ieee80211_mgmt *) skb->data;
1530         fc = le16_to_cpu(mgmt->frame_control);
1531
1532         mutex_lock(&ifmgd->mtx);
1533
1534         if (ifmgd->associated &&
1535             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1536                 switch (fc & IEEE80211_FCTL_STYPE) {
1537                 case IEEE80211_STYPE_BEACON:
1538                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1539                                                  rx_status);
1540                         break;
1541                 case IEEE80211_STYPE_PROBE_RESP:
1542                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1543                         break;
1544                 case IEEE80211_STYPE_DEAUTH:
1545                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1546                         break;
1547                 case IEEE80211_STYPE_DISASSOC:
1548                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1549                         break;
1550                 case IEEE80211_STYPE_ACTION:
1551                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1552                                 break;
1553
1554                         ieee80211_sta_process_chanswitch(sdata,
1555                                         &mgmt->u.action.u.chan_switch.sw_elem,
1556                                         (void *)ifmgd->associated->priv);
1557                         break;
1558                 }
1559                 mutex_unlock(&ifmgd->mtx);
1560
1561                 switch (rma) {
1562                 case RX_MGMT_NONE:
1563                         /* no action */
1564                         break;
1565                 case RX_MGMT_CFG80211_DEAUTH:
1566                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1567                         break;
1568                 case RX_MGMT_CFG80211_DISASSOC:
1569                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1570                         break;
1571                 default:
1572                         WARN(1, "unexpected: %d", rma);
1573                 }
1574                 goto out;
1575         }
1576
1577         mutex_unlock(&ifmgd->mtx);
1578
1579         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1580             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1581                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1582
1583  out:
1584         kfree_skb(skb);
1585 }
1586
1587 static void ieee80211_sta_timer(unsigned long data)
1588 {
1589         struct ieee80211_sub_if_data *sdata =
1590                 (struct ieee80211_sub_if_data *) data;
1591         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1592         struct ieee80211_local *local = sdata->local;
1593
1594         if (local->quiescing) {
1595                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1596                 return;
1597         }
1598
1599         ieee80211_queue_work(&local->hw, &ifmgd->work);
1600 }
1601
1602 static void ieee80211_sta_work(struct work_struct *work)
1603 {
1604         struct ieee80211_sub_if_data *sdata =
1605                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1606         struct ieee80211_local *local = sdata->local;
1607         struct ieee80211_if_managed *ifmgd;
1608         struct sk_buff *skb;
1609
1610         if (!ieee80211_sdata_running(sdata))
1611                 return;
1612
1613         if (local->scanning)
1614                 return;
1615
1616         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1617                 return;
1618
1619         /*
1620          * ieee80211_queue_work() should have picked up most cases,
1621          * here we'll pick the the rest.
1622          */
1623         if (WARN(local->suspended, "STA MLME work scheduled while "
1624                  "going to suspend\n"))
1625                 return;
1626
1627         ifmgd = &sdata->u.mgd;
1628
1629         /* first process frames to avoid timing out while a frame is pending */
1630         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1631                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1632
1633         /* then process the rest of the work */
1634         mutex_lock(&ifmgd->mtx);
1635
1636         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1637                             IEEE80211_STA_CONNECTION_POLL) &&
1638             ifmgd->associated) {
1639                 u8 bssid[ETH_ALEN];
1640
1641                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1642                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1643                         run_again(ifmgd, ifmgd->probe_timeout);
1644
1645                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1646 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1647                         printk(KERN_DEBUG "No probe response from AP %pM"
1648                                 " after %dms, try %d\n", bssid,
1649                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1650                                 ifmgd->probe_send_count);
1651 #endif
1652                         ieee80211_mgd_probe_ap_send(sdata);
1653                 } else {
1654                         /*
1655                          * We actually lost the connection ... or did we?
1656                          * Let's make sure!
1657                          */
1658                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1659                                           IEEE80211_STA_BEACON_POLL);
1660                         printk(KERN_DEBUG "No probe response from AP %pM"
1661                                 " after %dms, disconnecting.\n",
1662                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1663                         ieee80211_set_disassoc(sdata);
1664                         ieee80211_recalc_idle(local);
1665                         mutex_unlock(&ifmgd->mtx);
1666                         /*
1667                          * must be outside lock due to cfg80211,
1668                          * but that's not a problem.
1669                          */
1670                         ieee80211_send_deauth_disassoc(sdata, bssid,
1671                                         IEEE80211_STYPE_DEAUTH,
1672                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1673                                         NULL);
1674                         mutex_lock(&ifmgd->mtx);
1675                 }
1676         }
1677
1678         mutex_unlock(&ifmgd->mtx);
1679 }
1680
1681 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1682 {
1683         struct ieee80211_sub_if_data *sdata =
1684                 (struct ieee80211_sub_if_data *) data;
1685         struct ieee80211_local *local = sdata->local;
1686
1687         if (local->quiescing)
1688                 return;
1689
1690         ieee80211_queue_work(&sdata->local->hw,
1691                              &sdata->u.mgd.beacon_connection_loss_work);
1692 }
1693
1694 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1695 {
1696         struct ieee80211_sub_if_data *sdata =
1697                 (struct ieee80211_sub_if_data *) data;
1698         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1699         struct ieee80211_local *local = sdata->local;
1700
1701         if (local->quiescing)
1702                 return;
1703
1704         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1705 }
1706
1707 static void ieee80211_sta_monitor_work(struct work_struct *work)
1708 {
1709         struct ieee80211_sub_if_data *sdata =
1710                 container_of(work, struct ieee80211_sub_if_data,
1711                              u.mgd.monitor_work);
1712
1713         ieee80211_mgd_probe_ap(sdata, false);
1714 }
1715
1716 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1717 {
1718         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1719                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1720                                         IEEE80211_STA_CONNECTION_POLL);
1721
1722                 /* let's probe the connection once */
1723                 ieee80211_queue_work(&sdata->local->hw,
1724                            &sdata->u.mgd.monitor_work);
1725                 /* and do all the other regular work too */
1726                 ieee80211_queue_work(&sdata->local->hw,
1727                            &sdata->u.mgd.work);
1728         }
1729 }
1730
1731 #ifdef CONFIG_PM
1732 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1733 {
1734         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1735
1736         /*
1737          * we need to use atomic bitops for the running bits
1738          * only because both timers might fire at the same
1739          * time -- the code here is properly synchronised.
1740          */
1741
1742         cancel_work_sync(&ifmgd->work);
1743         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1744         if (del_timer_sync(&ifmgd->timer))
1745                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1746
1747         cancel_work_sync(&ifmgd->chswitch_work);
1748         if (del_timer_sync(&ifmgd->chswitch_timer))
1749                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1750
1751         cancel_work_sync(&ifmgd->monitor_work);
1752         /* these will just be re-established on connection */
1753         del_timer_sync(&ifmgd->conn_mon_timer);
1754         del_timer_sync(&ifmgd->bcn_mon_timer);
1755 }
1756
1757 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1758 {
1759         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1760
1761         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1762                 add_timer(&ifmgd->timer);
1763         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1764                 add_timer(&ifmgd->chswitch_timer);
1765 }
1766 #endif
1767
1768 /* interface setup */
1769 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1770 {
1771         struct ieee80211_if_managed *ifmgd;
1772
1773         ifmgd = &sdata->u.mgd;
1774         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1775         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1776         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1777         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1778                   ieee80211_beacon_connection_loss_work);
1779         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1780                     (unsigned long) sdata);
1781         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1782                     (unsigned long) sdata);
1783         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1784                     (unsigned long) sdata);
1785         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1786                     (unsigned long) sdata);
1787         skb_queue_head_init(&ifmgd->skb_queue);
1788
1789         ifmgd->flags = 0;
1790
1791         mutex_init(&ifmgd->mtx);
1792
1793         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1794                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1795         else
1796                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1797 }
1798
1799 /* scan finished notification */
1800 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1801 {
1802         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1803
1804         /* Restart STA timers */
1805         rcu_read_lock();
1806         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1807                 ieee80211_restart_sta_timer(sdata);
1808         rcu_read_unlock();
1809 }
1810
1811 int ieee80211_max_network_latency(struct notifier_block *nb,
1812                                   unsigned long data, void *dummy)
1813 {
1814         s32 latency_usec = (s32) data;
1815         struct ieee80211_local *local =
1816                 container_of(nb, struct ieee80211_local,
1817                              network_latency_notifier);
1818
1819         mutex_lock(&local->iflist_mtx);
1820         ieee80211_recalc_ps(local, latency_usec);
1821         mutex_unlock(&local->iflist_mtx);
1822
1823         return 0;
1824 }
1825
1826 /* config hooks */
1827 static enum work_done_result
1828 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1829                           struct sk_buff *skb)
1830 {
1831         if (!skb) {
1832                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1833                 return WORK_DONE_DESTROY;
1834         }
1835
1836         if (wk->type == IEEE80211_WORK_AUTH) {
1837                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1838                 return WORK_DONE_DESTROY;
1839         }
1840
1841         mutex_lock(&wk->sdata->u.mgd.mtx);
1842         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1843         mutex_unlock(&wk->sdata->u.mgd.mtx);
1844
1845         wk->type = IEEE80211_WORK_AUTH;
1846         wk->probe_auth.tries = 0;
1847         return WORK_DONE_REQUEUE;
1848 }
1849
1850 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1851                        struct cfg80211_auth_request *req)
1852 {
1853         const u8 *ssid;
1854         struct ieee80211_work *wk;
1855         u16 auth_alg;
1856
1857         switch (req->auth_type) {
1858         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1859                 auth_alg = WLAN_AUTH_OPEN;
1860                 break;
1861         case NL80211_AUTHTYPE_SHARED_KEY:
1862                 auth_alg = WLAN_AUTH_SHARED_KEY;
1863                 break;
1864         case NL80211_AUTHTYPE_FT:
1865                 auth_alg = WLAN_AUTH_FT;
1866                 break;
1867         case NL80211_AUTHTYPE_NETWORK_EAP:
1868                 auth_alg = WLAN_AUTH_LEAP;
1869                 break;
1870         default:
1871                 return -EOPNOTSUPP;
1872         }
1873
1874         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1875         if (!wk)
1876                 return -ENOMEM;
1877
1878         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1879
1880         if (req->ie && req->ie_len) {
1881                 memcpy(wk->ie, req->ie, req->ie_len);
1882                 wk->ie_len = req->ie_len;
1883         }
1884
1885         if (req->key && req->key_len) {
1886                 wk->probe_auth.key_len = req->key_len;
1887                 wk->probe_auth.key_idx = req->key_idx;
1888                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1889         }
1890
1891         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1892         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1893         wk->probe_auth.ssid_len = ssid[1];
1894
1895         wk->probe_auth.algorithm = auth_alg;
1896         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1897
1898         /* if we already have a probe, don't probe again */
1899         if (req->bss->proberesp_ies)
1900                 wk->type = IEEE80211_WORK_AUTH;
1901         else
1902                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1903         wk->chan = req->bss->channel;
1904         wk->sdata = sdata;
1905         wk->done = ieee80211_probe_auth_done;
1906
1907         ieee80211_add_work(wk);
1908         return 0;
1909 }
1910
1911 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1912                                                   struct sk_buff *skb)
1913 {
1914         struct ieee80211_mgmt *mgmt;
1915         u16 status;
1916
1917         if (!skb) {
1918                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1919                 return WORK_DONE_DESTROY;
1920         }
1921
1922         mgmt = (void *)skb->data;
1923         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1924
1925         if (status == WLAN_STATUS_SUCCESS) {
1926                 mutex_lock(&wk->sdata->u.mgd.mtx);
1927                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1928                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1929                         /* oops -- internal error -- send timeout for now */
1930                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1931                                                     wk->filter_ta);
1932                         return WORK_DONE_DESTROY;
1933                 }
1934                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1935         }
1936
1937         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1938         return WORK_DONE_DESTROY;
1939 }
1940
1941 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1942                         struct cfg80211_assoc_request *req)
1943 {
1944         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1945         struct ieee80211_bss *bss = (void *)req->bss->priv;
1946         struct ieee80211_work *wk;
1947         const u8 *ssid;
1948         int i;
1949
1950         mutex_lock(&ifmgd->mtx);
1951         if (ifmgd->associated) {
1952                 if (!req->prev_bssid ||
1953                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
1954                            ETH_ALEN)) {
1955                         /*
1956                          * We are already associated and the request was not a
1957                          * reassociation request from the current BSS, so
1958                          * reject it.
1959                          */
1960                         mutex_unlock(&ifmgd->mtx);
1961                         return -EALREADY;
1962                 }
1963
1964                 /* Trying to reassociate - clear previous association state */
1965                 ieee80211_set_disassoc(sdata);
1966         }
1967         mutex_unlock(&ifmgd->mtx);
1968
1969         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1970         if (!wk)
1971                 return -ENOMEM;
1972
1973         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1974         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1975
1976         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1977                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1978                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1979                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1980                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1981
1982
1983         if (req->ie && req->ie_len) {
1984                 memcpy(wk->ie, req->ie, req->ie_len);
1985                 wk->ie_len = req->ie_len;
1986         } else
1987                 wk->ie_len = 0;
1988
1989         wk->assoc.bss = req->bss;
1990
1991         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1992
1993         /* new association always uses requested smps mode */
1994         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1995                 if (ifmgd->powersave)
1996                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1997                 else
1998                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1999         } else
2000                 ifmgd->ap_smps = ifmgd->req_smps;
2001
2002         wk->assoc.smps = ifmgd->ap_smps;
2003         /*
2004          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2005          * We still associate in non-HT mode (11a/b/g) if any one of these
2006          * ciphers is configured as pairwise.
2007          * We can set this to true for non-11n hardware, that'll be checked
2008          * separately along with the peer capabilities.
2009          */
2010         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2011         wk->assoc.capability = req->bss->capability;
2012         wk->assoc.wmm_used = bss->wmm_used;
2013         wk->assoc.supp_rates = bss->supp_rates;
2014         wk->assoc.supp_rates_len = bss->supp_rates_len;
2015         wk->assoc.ht_information_ie =
2016                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2017
2018         if (bss->wmm_used && bss->uapsd_supported &&
2019             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2020                 wk->assoc.uapsd_used = true;
2021                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2022         } else {
2023                 wk->assoc.uapsd_used = false;
2024                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2025         }
2026
2027         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2028         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2029         wk->assoc.ssid_len = ssid[1];
2030
2031         if (req->prev_bssid)
2032                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2033
2034         wk->type = IEEE80211_WORK_ASSOC;
2035         wk->chan = req->bss->channel;
2036         wk->sdata = sdata;
2037         wk->done = ieee80211_assoc_done;
2038
2039         if (req->use_mfp) {
2040                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2041                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2042         } else {
2043                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2044                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2045         }
2046
2047         if (req->crypto.control_port)
2048                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2049         else
2050                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2051
2052         ieee80211_add_work(wk);
2053         return 0;
2054 }
2055
2056 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2057                          struct cfg80211_deauth_request *req,
2058                          void *cookie)
2059 {
2060         struct ieee80211_local *local = sdata->local;
2061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2062         struct ieee80211_work *wk;
2063         const u8 *bssid = req->bss->bssid;
2064
2065         mutex_lock(&ifmgd->mtx);
2066
2067         if (ifmgd->associated == req->bss) {
2068                 bssid = req->bss->bssid;
2069                 ieee80211_set_disassoc(sdata);
2070                 mutex_unlock(&ifmgd->mtx);
2071         } else {
2072                 bool not_auth_yet = false;
2073
2074                 mutex_unlock(&ifmgd->mtx);
2075
2076                 mutex_lock(&local->work_mtx);
2077                 list_for_each_entry(wk, &local->work_list, list) {
2078                         if (wk->sdata != sdata)
2079                                 continue;
2080
2081                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2082                             wk->type != IEEE80211_WORK_AUTH)
2083                                 continue;
2084
2085                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2086                                 continue;
2087
2088                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2089                         list_del_rcu(&wk->list);
2090                         free_work(wk);
2091                         break;
2092                 }
2093                 mutex_unlock(&local->work_mtx);
2094
2095                 /*
2096                  * If somebody requests authentication and we haven't
2097                  * sent out an auth frame yet there's no need to send
2098                  * out a deauth frame either. If the state was PROBE,
2099                  * then this is the case. If it's AUTH we have sent a
2100                  * frame, and if it's IDLE we have completed the auth
2101                  * process already.
2102                  */
2103                 if (not_auth_yet) {
2104                         __cfg80211_auth_canceled(sdata->dev, bssid);
2105                         return 0;
2106                 }
2107         }
2108
2109         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2110                sdata->name, bssid, req->reason_code);
2111
2112         ieee80211_send_deauth_disassoc(sdata, bssid,
2113                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2114                         cookie);
2115
2116         ieee80211_recalc_idle(sdata->local);
2117
2118         return 0;
2119 }
2120
2121 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2122                            struct cfg80211_disassoc_request *req,
2123                            void *cookie)
2124 {
2125         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2126
2127         mutex_lock(&ifmgd->mtx);
2128
2129         /*
2130          * cfg80211 should catch this ... but it's racy since
2131          * we can receive a disassoc frame, process it, hand it
2132          * to cfg80211 while that's in a locked section already
2133          * trying to tell us that the user wants to disconnect.
2134          */
2135         if (ifmgd->associated != req->bss) {
2136                 mutex_unlock(&ifmgd->mtx);
2137                 return -ENOLINK;
2138         }
2139
2140         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2141                sdata->name, req->bss->bssid, req->reason_code);
2142
2143         ieee80211_set_disassoc(sdata);
2144
2145         mutex_unlock(&ifmgd->mtx);
2146
2147         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2148                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2149                         cookie);
2150
2151         ieee80211_recalc_idle(sdata->local);
2152
2153         return 0;
2154 }
2155
2156 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2157                          struct ieee80211_channel *chan,
2158                          enum nl80211_channel_type channel_type,
2159                          const u8 *buf, size_t len, u64 *cookie)
2160 {
2161         struct ieee80211_local *local = sdata->local;
2162         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2163         struct sk_buff *skb;
2164
2165         /* Check that we are on the requested channel for transmission */
2166         if ((chan != local->tmp_channel ||
2167              channel_type != local->tmp_channel_type) &&
2168             (chan != local->oper_channel ||
2169              channel_type != local->oper_channel_type))
2170                 return -EBUSY;
2171
2172         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2173         if (!skb)
2174                 return -ENOMEM;
2175         skb_reserve(skb, local->hw.extra_tx_headroom);
2176
2177         memcpy(skb_put(skb, len), buf, len);
2178
2179         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2180                 IEEE80211_SKB_CB(skb)->flags |=
2181                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2182         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2183                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2184         skb->dev = sdata->dev;
2185         ieee80211_tx_skb(sdata, skb);
2186
2187         *cookie = (unsigned long) skb;
2188         return 0;
2189 }
2190
2191 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2192                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2193                                gfp_t gfp)
2194 {
2195         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2196
2197         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2198 }
2199 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);