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_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34 #define IEEE80211_MAX_PROBE_TRIES 5
  35
  36 /*
  37  * beacon loss detection timeout
  38  * XXX: should depend on beacon interval
  39  */
  40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  41 /*
  42  * Time the connection can be idle before we probe
  43  * it to see if we can still talk to the AP.
  44  */
  45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  46 /*
  47  * Time we wait for a probe response after sending
  48  * a probe request because of beacon loss or for
  49  * checking the connection still works.
  50  */
  51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  52
  53 #define TMR_RUNNING_TIMER       0
  54 #define TMR_RUNNING_CHANSW      1
  55
  56 /*
  57  * All cfg80211 functions have to be called outside a locked
  58  * section so that they can acquire a lock themselves... This
  59  * is much simpler than queuing up things in cfg80211, but we
  60  * do need some indirection for that here.
  61  */
  62 enum rx_mgmt_action {
  63         /* no action required */
  64         RX_MGMT_NONE,
  65
  66         /* caller must call cfg80211_send_rx_auth() */
  67         RX_MGMT_CFG80211_AUTH,
  68
  69         /* caller must call cfg80211_send_rx_assoc() */
  70         RX_MGMT_CFG80211_ASSOC,
  71
  72         /* caller must call cfg80211_send_deauth() */
  73         RX_MGMT_CFG80211_DEAUTH,
  74
  75         /* caller must call cfg80211_send_disassoc() */
  76         RX_MGMT_CFG80211_DISASSOC,
  77
  78         /* caller must tell cfg80211 about internal error */
  79         RX_MGMT_CFG80211_ASSOC_ERROR,
  80 };
  81
  82 /* utils */
  83 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  84 {
  85         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  86 }
  87
  88 /*
  89  * We can have multiple work items (and connection probing)
  90  * scheduling this timer, but we need to take care to only
  91  * reschedule it when it should fire _earlier_ than it was
  92  * asked for before, or if it's not pending right now. This
  93  * function ensures that. Note that it then is required to
  94  * run this function for all timeouts after the first one
  95  * has happened -- the work that runs from this timer will
  96  * do that.
  97  */
  98 static void run_again(struct ieee80211_if_managed *ifmgd,
  99                              unsigned long timeout)
 100 {
 101         ASSERT_MGD_MTX(ifmgd);
 102
 103         if (!timer_pending(&ifmgd->timer) ||
 104             time_before(timeout, ifmgd->timer.expires))
 105                 mod_timer(&ifmgd->timer, timeout);
 106 }
 107
 108 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 109 {
 110         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 111                 return;
 112
 113         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 114                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 115 }
 116
 117 static int ecw2cw(int ecw)
 118 {
 119         return (1 << ecw) - 1;
 120 }
 121
 122 /*
 123  * ieee80211_enable_ht should be called only after the operating band
 124  * has been determined as ht configuration depends on the hw's
 125  * HT abilities for a specific band.
 126  */
 127 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 128                                struct ieee80211_ht_info *hti,
 129                                const u8 *bssid, u16 ap_ht_cap_flags)
 130 {
 131         struct ieee80211_local *local = sdata->local;
 132         struct ieee80211_supported_band *sband;
 133         struct sta_info *sta;
 134         u32 changed = 0;
 135         u16 ht_opmode;
 136         bool enable_ht = true, ht_changed;
 137         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 138
 139         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 140
 141         /* HT is not supported */
 142         if (!sband->ht_cap.ht_supported)
 143                 enable_ht = false;
 144
 145         /* check that channel matches the right operating channel */
 146         if (local->hw.conf.channel->center_freq !=
 147             ieee80211_channel_to_frequency(hti->control_chan))
 148                 enable_ht = false;
 149
 150         if (enable_ht) {
 151                 channel_type = NL80211_CHAN_HT20;
 152
 153                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 154                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 155                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 156                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 157                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 158                                 if (!(local->hw.conf.channel->flags &
 159                                     IEEE80211_CHAN_NO_HT40PLUS))
 160                                         channel_type = NL80211_CHAN_HT40PLUS;
 161                                 break;
 162                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 163                                 if (!(local->hw.conf.channel->flags &
 164                                     IEEE80211_CHAN_NO_HT40MINUS))
 165                                         channel_type = NL80211_CHAN_HT40MINUS;
 166                                 break;
 167                         }
 168                 }
 169         }
 170
 171         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 172                      channel_type != local->hw.conf.channel_type;
 173
 174         local->oper_channel_type = channel_type;
 175
 176         if (ht_changed) {
 177                 /* channel_type change automatically detected */
 178                 ieee80211_hw_config(local, 0);
 179
 180                 rcu_read_lock();
 181                 sta = sta_info_get(sdata, bssid);
 182                 if (sta)
 183                         rate_control_rate_update(local, sband, sta,
 184                                                  IEEE80211_RC_HT_CHANGED);
 185                 rcu_read_unlock();
 186         }
 187
 188         /* disable HT */
 189         if (!enable_ht)
 190                 return 0;
 191
 192         ht_opmode = le16_to_cpu(hti->operation_mode);
 193
 194         /* if bss configuration changed store the new one */
 195         if (!sdata->ht_opmode_valid ||
 196             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 197                 changed |= BSS_CHANGED_HT;
 198                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 199                 sdata->ht_opmode_valid = true;
 200         }
 201
 202         return changed;
 203 }
 204
 205 /* frame sending functions */
 206
 207 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 208                                            const u8 *bssid, u16 stype, u16 reason,
 209                                            void *cookie)
 210 {
 211         struct ieee80211_local *local = sdata->local;
 212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 213         struct sk_buff *skb;
 214         struct ieee80211_mgmt *mgmt;
 215
 216         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 219                        "deauth/disassoc frame\n", sdata->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 225         memset(mgmt, 0, 24);
 226         memcpy(mgmt->da, bssid, ETH_ALEN);
 227         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 228         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 229         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 230         skb_put(skb, 2);
 231         /* u.deauth.reason_code == u.disassoc.reason_code */
 232         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 233
 234         if (stype == IEEE80211_STYPE_DEAUTH)
 235                 if (cookie)
 236                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 237                 else
 238                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 239         else
 240                 if (cookie)
 241                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 242                 else
 243                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 244         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 245                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 246         ieee80211_tx_skb(sdata, skb);
 247 }
 248
 249 void ieee80211_send_pspoll(struct ieee80211_local *local,
 250                            struct ieee80211_sub_if_data *sdata)
 251 {
 252         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 253         struct ieee80211_pspoll *pspoll;
 254         struct sk_buff *skb;
 255         u16 fc;
 256
 257         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 258         if (!skb) {
 259                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 260                        "pspoll frame\n", sdata->name);
 261                 return;
 262         }
 263         skb_reserve(skb, local->hw.extra_tx_headroom);
 264
 265         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 266         memset(pspoll, 0, sizeof(*pspoll));
 267         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 268         pspoll->frame_control = cpu_to_le16(fc);
 269         pspoll->aid = cpu_to_le16(ifmgd->aid);
 270
 271         /* aid in PS-Poll has its two MSBs each set to 1 */
 272         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 273
 274         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 275         memcpy(pspoll->ta, sdata->vif.addr, ETH_ALEN);
 276
 277         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 278         ieee80211_tx_skb(sdata, skb);
 279 }
 280
 281 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 282                              struct ieee80211_sub_if_data *sdata,
 283                              int powersave)
 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 + 24);
 293         if (!skb) {
 294                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 295                        "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, 24);
 301         memset(nullfunc, 0, 24);
 302         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 303                          IEEE80211_FCTL_TODS);
 304         if (powersave)
 305                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 306         nullfunc->frame_control = fc;
 307         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 308         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 309         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 310
 311         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 312         ieee80211_tx_skb(sdata, skb);
 313 }
 314
 315 /* spectrum management related things */
 316 static void ieee80211_chswitch_work(struct work_struct *work)
 317 {
 318         struct ieee80211_sub_if_data *sdata =
 319                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 320         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 321
 322         if (!ieee80211_sdata_running(sdata))
 323                 return;
 324
 325         mutex_lock(&ifmgd->mtx);
 326         if (!ifmgd->associated)
 327                 goto out;
 328
 329         sdata->local->oper_channel = sdata->local->csa_channel;
 330         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 331
 332         /* XXX: shouldn't really modify cfg80211-owned data! */
 333         ifmgd->associated->channel = sdata->local->oper_channel;
 334
 335         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 336                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 337  out:
 338         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 339         mutex_unlock(&ifmgd->mtx);
 340 }
 341
 342 static void ieee80211_chswitch_timer(unsigned long data)
 343 {
 344         struct ieee80211_sub_if_data *sdata =
 345                 (struct ieee80211_sub_if_data *) data;
 346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 347
 348         if (sdata->local->quiescing) {
 349                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 350                 return;
 351         }
 352
 353         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 354 }
 355
 356 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 357                                       struct ieee80211_channel_sw_ie *sw_elem,
 358                                       struct ieee80211_bss *bss)
 359 {
 360         struct cfg80211_bss *cbss =
 361                 container_of((void *)bss, struct cfg80211_bss, priv);
 362         struct ieee80211_channel *new_ch;
 363         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 364         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 365
 366         ASSERT_MGD_MTX(ifmgd);
 367
 368         if (!ifmgd->associated)
 369                 return;
 370
 371         if (sdata->local->scanning)
 372                 return;
 373
 374         /* Disregard subsequent beacons if we are already running a timer
 375            processing a CSA */
 376
 377         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 378                 return;
 379
 380         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 381         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 382                 return;
 383
 384         sdata->local->csa_channel = new_ch;
 385
 386         if (sw_elem->count <= 1) {
 387                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 388         } else {
 389                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 390                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 391                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 392                 mod_timer(&ifmgd->chswitch_timer,
 393                           jiffies +
 394                           msecs_to_jiffies(sw_elem->count *
 395                                            cbss->beacon_interval));
 396         }
 397 }
 398
 399 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 400                                         u16 capab_info, u8 *pwr_constr_elem,
 401                                         u8 pwr_constr_elem_len)
 402 {
 403         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 404
 405         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 406                 return;
 407
 408         /* Power constraint IE length should be 1 octet */
 409         if (pwr_constr_elem_len != 1)
 410                 return;
 411
 412         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 413             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 414                 sdata->local->power_constr_level = *pwr_constr_elem;
 415                 ieee80211_hw_config(sdata->local, 0);
 416         }
 417 }
 418
 419 /* powersave */
 420 static void ieee80211_enable_ps(struct ieee80211_local *local,
 421                                 struct ieee80211_sub_if_data *sdata)
 422 {
 423         struct ieee80211_conf *conf = &local->hw.conf;
 424
 425         /*
 426          * If we are scanning right now then the parameters will
 427          * take effect when scan finishes.
 428          */
 429         if (local->scanning)
 430                 return;
 431
 432         if (conf->dynamic_ps_timeout > 0 &&
 433             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 434                 mod_timer(&local->dynamic_ps_timer, jiffies +
 435                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 436         } else {
 437                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 438                         ieee80211_send_nullfunc(local, sdata, 1);
 439                 conf->flags |= IEEE80211_CONF_PS;
 440                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 441         }
 442 }
 443
 444 static void ieee80211_change_ps(struct ieee80211_local *local)
 445 {
 446         struct ieee80211_conf *conf = &local->hw.conf;
 447
 448         if (local->ps_sdata) {
 449                 ieee80211_enable_ps(local, local->ps_sdata);
 450         } else if (conf->flags & IEEE80211_CONF_PS) {
 451                 conf->flags &= ~IEEE80211_CONF_PS;
 452                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 453                 del_timer_sync(&local->dynamic_ps_timer);
 454                 cancel_work_sync(&local->dynamic_ps_enable_work);
 455         }
 456 }
 457
 458 /* need to hold RTNL or interface lock */
 459 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 460 {
 461         struct ieee80211_sub_if_data *sdata, *found = NULL;
 462         int count = 0;
 463
 464         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 465                 local->ps_sdata = NULL;
 466                 return;
 467         }
 468
 469         if (!list_empty(&local->work_list)) {
 470                 local->ps_sdata = NULL;
 471                 goto change;
 472         }
 473
 474         list_for_each_entry(sdata, &local->interfaces, list) {
 475                 if (!ieee80211_sdata_running(sdata))
 476                         continue;
 477                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 478                         continue;
 479                 found = sdata;
 480                 count++;
 481         }
 482
 483         if (count == 1 && found->u.mgd.powersave &&
 484             found->u.mgd.associated &&
 485             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 486                                     IEEE80211_STA_CONNECTION_POLL))) {
 487                 s32 beaconint_us;
 488
 489                 if (latency < 0)
 490                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 491
 492                 beaconint_us = ieee80211_tu_to_usec(
 493                                         found->vif.bss_conf.beacon_int);
 494
 495                 if (beaconint_us > latency) {
 496                         local->ps_sdata = NULL;
 497                 } else {
 498                         u8 dtimper = found->vif.bss_conf.dtim_period;
 499                         int maxslp = 1;
 500
 501                         if (dtimper > 1)
 502                                 maxslp = min_t(int, dtimper,
 503                                                     latency / beaconint_us);
 504
 505                         local->hw.conf.max_sleep_period = maxslp;
 506                         local->ps_sdata = found;
 507                 }
 508         } else {
 509                 local->ps_sdata = NULL;
 510         }
 511
 512  change:
 513         ieee80211_change_ps(local);
 514 }
 515
 516 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 517 {
 518         struct ieee80211_local *local =
 519                 container_of(work, struct ieee80211_local,
 520                              dynamic_ps_disable_work);
 521
 522         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 523                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 524                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 525         }
 526
 527         ieee80211_wake_queues_by_reason(&local->hw,
 528                                         IEEE80211_QUEUE_STOP_REASON_PS);
 529 }
 530
 531 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 532 {
 533         struct ieee80211_local *local =
 534                 container_of(work, struct ieee80211_local,
 535                              dynamic_ps_enable_work);
 536         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 537
 538         /* can only happen when PS was just disabled anyway */
 539         if (!sdata)
 540                 return;
 541
 542         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 543                 return;
 544
 545         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 546                 ieee80211_send_nullfunc(local, sdata, 1);
 547
 548         local->hw.conf.flags |= IEEE80211_CONF_PS;
 549         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 550 }
 551
 552 void ieee80211_dynamic_ps_timer(unsigned long data)
 553 {
 554         struct ieee80211_local *local = (void *) data;
 555
 556         if (local->quiescing || local->suspended)
 557                 return;
 558
 559         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 560 }
 561
 562 /* MLME */
 563 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 564                                      struct ieee80211_if_managed *ifmgd,
 565                                      u8 *wmm_param, size_t wmm_param_len)
 566 {
 567         struct ieee80211_tx_queue_params params;
 568         size_t left;
 569         int count;
 570         u8 *pos;
 571
 572         if (local->hw.queues < 4)
 573                 return;
 574
 575         if (!wmm_param)
 576                 return;
 577
 578         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 579                 return;
 580         count = wmm_param[6] & 0x0f;
 581         if (count == ifmgd->wmm_last_param_set)
 582                 return;
 583         ifmgd->wmm_last_param_set = count;
 584
 585         pos = wmm_param + 8;
 586         left = wmm_param_len - 8;
 587
 588         memset(&params, 0, sizeof(params));
 589
 590         local->wmm_acm = 0;
 591         for (; left >= 4; left -= 4, pos += 4) {
 592                 int aci = (pos[0] >> 5) & 0x03;
 593                 int acm = (pos[0] >> 4) & 0x01;
 594                 int queue;
 595
 596                 switch (aci) {
 597                 case 1: /* AC_BK */
 598                         queue = 3;
 599                         if (acm)
 600                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 601                         break;
 602                 case 2: /* AC_VI */
 603                         queue = 1;
 604                         if (acm)
 605                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 606                         break;
 607                 case 3: /* AC_VO */
 608                         queue = 0;
 609                         if (acm)
 610                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 611                         break;
 612                 case 0: /* AC_BE */
 613                 default:
 614                         queue = 2;
 615                         if (acm)
 616                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 617                         break;
 618                 }
 619
 620                 params.aifs = pos[0] & 0x0f;
 621                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 622                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 623                 params.txop = get_unaligned_le16(pos + 2);
 624 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 625                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 626                        "cWmin=%d cWmax=%d txop=%d\n",
 627                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 628                        params.aifs, params.cw_min, params.cw_max, params.txop);
 629 #endif
 630                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 631                         printk(KERN_DEBUG "%s: failed to set TX queue "
 632                                "parameters for queue %d\n",
 633                                wiphy_name(local->hw.wiphy), queue);
 634         }
 635 }
 636
 637 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 638                                            u16 capab, bool erp_valid, u8 erp)
 639 {
 640         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 641         u32 changed = 0;
 642         bool use_protection;
 643         bool use_short_preamble;
 644         bool use_short_slot;
 645
 646         if (erp_valid) {
 647                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 648                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 649         } else {
 650                 use_protection = false;
 651                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 652         }
 653
 654         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 655
 656         if (use_protection != bss_conf->use_cts_prot) {
 657                 bss_conf->use_cts_prot = use_protection;
 658                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 659         }
 660
 661         if (use_short_preamble != bss_conf->use_short_preamble) {
 662                 bss_conf->use_short_preamble = use_short_preamble;
 663                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 664         }
 665
 666         if (use_short_slot != bss_conf->use_short_slot) {
 667                 bss_conf->use_short_slot = use_short_slot;
 668                 changed |= BSS_CHANGED_ERP_SLOT;
 669         }
 670
 671         return changed;
 672 }
 673
 674 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 675                                      struct cfg80211_bss *cbss,
 676                                      u32 bss_info_changed)
 677 {
 678         struct ieee80211_bss *bss = (void *)cbss->priv;
 679         struct ieee80211_local *local = sdata->local;
 680
 681         bss_info_changed |= BSS_CHANGED_ASSOC;
 682         /* set timing information */
 683         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 684         sdata->vif.bss_conf.timestamp = cbss->tsf;
 685         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 686
 687         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 688         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 689                 cbss->capability, bss->has_erp_value, bss->erp_value);
 690
 691         sdata->u.mgd.associated = cbss;
 692         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 693
 694         /* just to be sure */
 695         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 696                                 IEEE80211_STA_BEACON_POLL);
 697
 698         /*
 699          * Always handle WMM once after association regardless
 700          * of the first value the AP uses. Setting -1 here has
 701          * that effect because the AP values is an unsigned
 702          * 4-bit value.
 703          */
 704         sdata->u.mgd.wmm_last_param_set = -1;
 705
 706         ieee80211_led_assoc(local, 1);
 707
 708         sdata->vif.bss_conf.assoc = 1;
 709         /*
 710          * For now just always ask the driver to update the basic rateset
 711          * when we have associated, we aren't checking whether it actually
 712          * changed or not.
 713          */
 714         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 715
 716         /* And the BSSID changed - we're associated now */
 717         bss_info_changed |= BSS_CHANGED_BSSID;
 718
 719         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 720
 721         mutex_lock(&local->iflist_mtx);
 722         ieee80211_recalc_ps(local, -1);
 723         ieee80211_recalc_smps(local, sdata);
 724         mutex_unlock(&local->iflist_mtx);
 725
 726         netif_start_queue(sdata->dev);
 727         netif_carrier_on(sdata->dev);
 728 }
 729
 730 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 731 {
 732         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 733         struct ieee80211_local *local = sdata->local;
 734         struct sta_info *sta;
 735         u32 changed = 0, config_changed = 0;
 736         u8 bssid[ETH_ALEN];
 737
 738         ASSERT_MGD_MTX(ifmgd);
 739
 740         if (WARN_ON(!ifmgd->associated))
 741                 return;
 742
 743         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 744
 745         ifmgd->associated = NULL;
 746         memset(ifmgd->bssid, 0, ETH_ALEN);
 747
 748         /*
 749          * we need to commit the associated = NULL change because the
 750          * scan code uses that to determine whether this iface should
 751          * go to/wake up from powersave or not -- and could otherwise
 752          * wake the queues erroneously.
 753          */
 754         smp_mb();
 755
 756         /*
 757          * Thus, we can only afterwards stop the queues -- to account
 758          * for the case where another CPU is finishing a scan at this
 759          * time -- we don't want the scan code to enable queues.
 760          */
 761
 762         netif_stop_queue(sdata->dev);
 763         netif_carrier_off(sdata->dev);
 764
 765         rcu_read_lock();
 766         sta = sta_info_get(sdata, bssid);
 767         if (sta)
 768                 ieee80211_sta_tear_down_BA_sessions(sta);
 769         rcu_read_unlock();
 770
 771         changed |= ieee80211_reset_erp_info(sdata);
 772
 773         ieee80211_led_assoc(local, 0);
 774         changed |= BSS_CHANGED_ASSOC;
 775         sdata->vif.bss_conf.assoc = false;
 776
 777         ieee80211_set_wmm_default(sdata);
 778
 779         /* channel(_type) changes are handled by ieee80211_hw_config */
 780         local->oper_channel_type = NL80211_CHAN_NO_HT;
 781
 782         /* on the next assoc, re-program HT parameters */
 783         sdata->ht_opmode_valid = false;
 784
 785         local->power_constr_level = 0;
 786
 787         del_timer_sync(&local->dynamic_ps_timer);
 788         cancel_work_sync(&local->dynamic_ps_enable_work);
 789
 790         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 791                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 792                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 793         }
 794
 795         ieee80211_hw_config(local, config_changed);
 796
 797         /* And the BSSID changed -- not very interesting here */
 798         changed |= BSS_CHANGED_BSSID;
 799         ieee80211_bss_info_change_notify(sdata, changed);
 800
 801         rcu_read_lock();
 802
 803         sta = sta_info_get(sdata, bssid);
 804         if (!sta) {
 805                 rcu_read_unlock();
 806                 return;
 807         }
 808
 809         sta_info_unlink(&sta);
 810
 811         rcu_read_unlock();
 812
 813         sta_info_destroy(sta);
 814 }
 815
 816 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 817                              struct ieee80211_hdr *hdr)
 818 {
 819         /*
 820          * We can postpone the mgd.timer whenever receiving unicast frames
 821          * from AP because we know that the connection is working both ways
 822          * at that time. But multicast frames (and hence also beacons) must
 823          * be ignored here, because we need to trigger the timer during
 824          * data idle periods for sending the periodic probe request to the
 825          * AP we're connected to.
 826          */
 827         if (is_multicast_ether_addr(hdr->addr1))
 828                 return;
 829
 830         mod_timer(&sdata->u.mgd.conn_mon_timer,
 831                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 832 }
 833
 834 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 835 {
 836         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 837         const u8 *ssid;
 838
 839         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 840         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 841                                  ssid + 2, ssid[1], NULL, 0);
 842
 843         ifmgd->probe_send_count++;
 844         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 845         run_again(ifmgd, ifmgd->probe_timeout);
 846 }
 847
 848 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 849                                    bool beacon)
 850 {
 851         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 852         bool already = false;
 853
 854         if (!ieee80211_sdata_running(sdata))
 855                 return;
 856
 857         if (sdata->local->scanning)
 858                 return;
 859
 860         if (sdata->local->tmp_channel)
 861                 return;
 862
 863         mutex_lock(&ifmgd->mtx);
 864
 865         if (!ifmgd->associated)
 866                 goto out;
 867
 868 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 869         if (beacon && net_ratelimit())
 870                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 871                        "- sending probe request\n", sdata->name);
 872 #endif
 873
 874         /*
 875          * The driver/our work has already reported this event or the
 876          * connection monitoring has kicked in and we have already sent
 877          * a probe request. Or maybe the AP died and the driver keeps
 878          * reporting until we disassociate...
 879          *
 880          * In either case we have to ignore the current call to this
 881          * function (except for setting the correct probe reason bit)
 882          * because otherwise we would reset the timer every time and
 883          * never check whether we received a probe response!
 884          */
 885         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 886                             IEEE80211_STA_CONNECTION_POLL))
 887                 already = true;
 888
 889         if (beacon)
 890                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 891         else
 892                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 893
 894         if (already)
 895                 goto out;
 896
 897         mutex_lock(&sdata->local->iflist_mtx);
 898         ieee80211_recalc_ps(sdata->local, -1);
 899         mutex_unlock(&sdata->local->iflist_mtx);
 900
 901         ifmgd->probe_send_count = 0;
 902         ieee80211_mgd_probe_ap_send(sdata);
 903  out:
 904         mutex_unlock(&ifmgd->mtx);
 905 }
 906
 907 void ieee80211_beacon_loss_work(struct work_struct *work)
 908 {
 909         struct ieee80211_sub_if_data *sdata =
 910                 container_of(work, struct ieee80211_sub_if_data,
 911                              u.mgd.beacon_loss_work);
 912
 913         ieee80211_mgd_probe_ap(sdata, true);
 914 }
 915
 916 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 917 {
 918         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 919
 920         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 921 }
 922 EXPORT_SYMBOL(ieee80211_beacon_loss);
 923
 924 static enum rx_mgmt_action __must_check
 925 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 926                          struct ieee80211_mgmt *mgmt, size_t len)
 927 {
 928         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 929         const u8 *bssid = NULL;
 930         u16 reason_code;
 931
 932         if (len < 24 + 2)
 933                 return RX_MGMT_NONE;
 934
 935         ASSERT_MGD_MTX(ifmgd);
 936
 937         bssid = ifmgd->associated->bssid;
 938
 939         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 940
 941         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 942                         sdata->name, bssid, reason_code);
 943
 944         ieee80211_set_disassoc(sdata);
 945         ieee80211_recalc_idle(sdata->local);
 946
 947         return RX_MGMT_CFG80211_DEAUTH;
 948 }
 949
 950
 951 static enum rx_mgmt_action __must_check
 952 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 953                            struct ieee80211_mgmt *mgmt, size_t len)
 954 {
 955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 956         u16 reason_code;
 957
 958         if (len < 24 + 2)
 959                 return RX_MGMT_NONE;
 960
 961         ASSERT_MGD_MTX(ifmgd);
 962
 963         if (WARN_ON(!ifmgd->associated))
 964                 return RX_MGMT_NONE;
 965
 966         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 967                 return RX_MGMT_NONE;
 968
 969         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 970
 971         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
 972                         sdata->name, mgmt->sa, reason_code);
 973
 974         ieee80211_set_disassoc(sdata);
 975         ieee80211_recalc_idle(sdata->local);
 976         return RX_MGMT_CFG80211_DISASSOC;
 977 }
 978
 979
 980 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
 981                                     struct ieee80211_mgmt *mgmt, size_t len)
 982 {
 983         struct ieee80211_sub_if_data *sdata = wk->sdata;
 984         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 985         struct ieee80211_local *local = sdata->local;
 986         struct ieee80211_supported_band *sband;
 987         struct sta_info *sta;
 988         struct cfg80211_bss *cbss = wk->assoc.bss;
 989         u8 *pos;
 990         u32 rates, basic_rates;
 991         u16 capab_info, aid;
 992         struct ieee802_11_elems elems;
 993         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 994         u32 changed = 0;
 995         int i, j, err;
 996         bool have_higher_than_11mbit = false;
 997         u16 ap_ht_cap_flags;
 998
 999         /* AssocResp and ReassocResp have identical structure */
1000
1001         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1002         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1003
1004         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1005                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1006                        "set\n", sdata->name, aid);
1007         aid &= ~(BIT(15) | BIT(14));
1008
1009         pos = mgmt->u.assoc_resp.variable;
1010         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1011
1012         if (!elems.supp_rates) {
1013                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1014                        sdata->name);
1015                 return false;
1016         }
1017
1018         ifmgd->aid = aid;
1019
1020         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1021         if (!sta) {
1022                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1023                        " the AP\n", sdata->name);
1024                 return false;
1025         }
1026
1027         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1028                            WLAN_STA_ASSOC_AP);
1029         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1030                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1031
1032         rates = 0;
1033         basic_rates = 0;
1034         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1035
1036         for (i = 0; i < elems.supp_rates_len; i++) {
1037                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1038                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1039
1040                 if (rate > 110)
1041                         have_higher_than_11mbit = true;
1042
1043                 for (j = 0; j < sband->n_bitrates; j++) {
1044                         if (sband->bitrates[j].bitrate == rate) {
1045                                 rates |= BIT(j);
1046                                 if (is_basic)
1047                                         basic_rates |= BIT(j);
1048                                 break;
1049                         }
1050                 }
1051         }
1052
1053         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1054                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1055                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1056
1057                 if (rate > 110)
1058                         have_higher_than_11mbit = true;
1059
1060                 for (j = 0; j < sband->n_bitrates; j++) {
1061                         if (sband->bitrates[j].bitrate == rate) {
1062                                 rates |= BIT(j);
1063                                 if (is_basic)
1064                                         basic_rates |= BIT(j);
1065                                 break;
1066                         }
1067                 }
1068         }
1069
1070         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1071         sdata->vif.bss_conf.basic_rates = basic_rates;
1072
1073         /* cf. IEEE 802.11 9.2.12 */
1074         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1075             have_higher_than_11mbit)
1076                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1077         else
1078                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1079
1080         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1081                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1082                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1083
1084         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1085
1086         rate_control_rate_init(sta);
1087
1088         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1089                 set_sta_flags(sta, WLAN_STA_MFP);
1090
1091         if (elems.wmm_param)
1092                 set_sta_flags(sta, WLAN_STA_WME);
1093
1094         err = sta_info_insert(sta);
1095         sta = NULL;
1096         if (err) {
1097                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1098                        " the AP (error %d)\n", sdata->name, err);
1099                 return RX_MGMT_CFG80211_ASSOC_ERROR;
1100         }
1101
1102         if (elems.wmm_param)
1103                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1104                                          elems.wmm_param_len);
1105         else
1106                 ieee80211_set_wmm_default(sdata);
1107
1108         if (elems.ht_info_elem && elems.wmm_param &&
1109             (sdata->local->hw.queues >= 4) &&
1110             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1111                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1112                                                cbss->bssid, ap_ht_cap_flags);
1113
1114         /* set AID and assoc capability,
1115          * ieee80211_set_associated() will tell the driver */
1116         bss_conf->aid = aid;
1117         bss_conf->assoc_capability = capab_info;
1118         ieee80211_set_associated(sdata, cbss, changed);
1119
1120         /*
1121          * Start timer to probe the connection to the AP now.
1122          * Also start the timer that will detect beacon loss.
1123          */
1124         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1125         mod_beacon_timer(sdata);
1126
1127         return true;
1128 }
1129
1130
1131 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1132                                   struct ieee80211_mgmt *mgmt,
1133                                   size_t len,
1134                                   struct ieee80211_rx_status *rx_status,
1135                                   struct ieee802_11_elems *elems,
1136                                   bool beacon)
1137 {
1138         struct ieee80211_local *local = sdata->local;
1139         int freq;
1140         struct ieee80211_bss *bss;
1141         struct ieee80211_channel *channel;
1142
1143         if (elems->ds_params && elems->ds_params_len == 1)
1144                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1145         else
1146                 freq = rx_status->freq;
1147
1148         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1149
1150         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1151                 return;
1152
1153         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1154                                         channel, beacon);
1155         if (bss)
1156                 ieee80211_rx_bss_put(local, bss);
1157
1158         if (!sdata->u.mgd.associated)
1159                 return;
1160
1161         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1162             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1163                                                         ETH_ALEN) == 0)) {
1164                 struct ieee80211_channel_sw_ie *sw_elem =
1165                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1166                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1167         }
1168 }
1169
1170
1171 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1172                                          struct sk_buff *skb)
1173 {
1174         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1175         struct ieee80211_if_managed *ifmgd;
1176         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1177         size_t baselen, len = skb->len;
1178         struct ieee802_11_elems elems;
1179
1180         ifmgd = &sdata->u.mgd;
1181
1182         ASSERT_MGD_MTX(ifmgd);
1183
1184         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1185                 return; /* ignore ProbeResp to foreign address */
1186
1187         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1188         if (baselen > len)
1189                 return;
1190
1191         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1192                                 &elems);
1193
1194         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1195
1196         if (ifmgd->associated &&
1197             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1198             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1199                             IEEE80211_STA_CONNECTION_POLL)) {
1200                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1201                                   IEEE80211_STA_BEACON_POLL);
1202                 mutex_lock(&sdata->local->iflist_mtx);
1203                 ieee80211_recalc_ps(sdata->local, -1);
1204                 mutex_unlock(&sdata->local->iflist_mtx);
1205                 /*
1206                  * We've received a probe response, but are not sure whether
1207                  * we have or will be receiving any beacons or data, so let's
1208                  * schedule the timers again, just in case.
1209                  */
1210                 mod_beacon_timer(sdata);
1211                 mod_timer(&ifmgd->conn_mon_timer,
1212                           round_jiffies_up(jiffies +
1213                                            IEEE80211_CONNECTION_IDLE_TIME));
1214         }
1215 }
1216
1217 /*
1218  * This is the canonical list of information elements we care about,
1219  * the filter code also gives us all changes to the Microsoft OUI
1220  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1221  *
1222  * We implement beacon filtering in software since that means we can
1223  * avoid processing the frame here and in cfg80211, and userspace
1224  * will not be able to tell whether the hardware supports it or not.
1225  *
1226  * XXX: This list needs to be dynamic -- userspace needs to be able to
1227  *      add items it requires. It also needs to be able to tell us to
1228  *      look out for other vendor IEs.
1229  */
1230 static const u64 care_about_ies =
1231         (1ULL << WLAN_EID_COUNTRY) |
1232         (1ULL << WLAN_EID_ERP_INFO) |
1233         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1234         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1235         (1ULL << WLAN_EID_HT_CAPABILITY) |
1236         (1ULL << WLAN_EID_HT_INFORMATION);
1237
1238 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1239                                      struct ieee80211_mgmt *mgmt,
1240                                      size_t len,
1241                                      struct ieee80211_rx_status *rx_status)
1242 {
1243         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1244         size_t baselen;
1245         struct ieee802_11_elems elems;
1246         struct ieee80211_local *local = sdata->local;
1247         u32 changed = 0;
1248         bool erp_valid, directed_tim = false;
1249         u8 erp_value = 0;
1250         u32 ncrc;
1251         u8 *bssid;
1252
1253         ASSERT_MGD_MTX(ifmgd);
1254
1255         /* Process beacon from the current BSS */
1256         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1257         if (baselen > len)
1258                 return;
1259
1260         if (rx_status->freq != local->hw.conf.channel->center_freq)
1261                 return;
1262
1263         /*
1264          * We might have received a number of frames, among them a
1265          * disassoc frame and a beacon...
1266          */
1267         if (!ifmgd->associated)
1268                 return;
1269
1270         bssid = ifmgd->associated->bssid;
1271
1272         /*
1273          * And in theory even frames from a different AP we were just
1274          * associated to a split-second ago!
1275          */
1276         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1277                 return;
1278
1279         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1280 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1281                 if (net_ratelimit()) {
1282                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1283                                "to a received beacon\n", sdata->name);
1284                 }
1285 #endif
1286                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1287                 mutex_lock(&local->iflist_mtx);
1288                 ieee80211_recalc_ps(local, -1);
1289                 mutex_unlock(&local->iflist_mtx);
1290         }
1291
1292         /*
1293          * Push the beacon loss detection into the future since
1294          * we are processing a beacon from the AP just now.
1295          */
1296         mod_beacon_timer(sdata);
1297
1298         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1299         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1300                                           len - baselen, &elems,
1301                                           care_about_ies, ncrc);
1302
1303         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1304                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1305                                                    ifmgd->aid);
1306
1307         if (ncrc != ifmgd->beacon_crc) {
1308                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1309                                       true);
1310
1311                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1312                                          elems.wmm_param_len);
1313         }
1314
1315         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1316                 if (directed_tim) {
1317                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1318                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1319                                 ieee80211_hw_config(local,
1320                                                     IEEE80211_CONF_CHANGE_PS);
1321                                 ieee80211_send_nullfunc(local, sdata, 0);
1322                         } else {
1323                                 local->pspolling = true;
1324
1325                                 /*
1326                                  * Here is assumed that the driver will be
1327                                  * able to send ps-poll frame and receive a
1328                                  * response even though power save mode is
1329                                  * enabled, but some drivers might require
1330                                  * to disable power save here. This needs
1331                                  * to be investigated.
1332                                  */
1333                                 ieee80211_send_pspoll(local, sdata);
1334                         }
1335                 }
1336         }
1337
1338         if (ncrc == ifmgd->beacon_crc)
1339                 return;
1340         ifmgd->beacon_crc = ncrc;
1341
1342         if (elems.erp_info && elems.erp_info_len >= 1) {
1343                 erp_valid = true;
1344                 erp_value = elems.erp_info[0];
1345         } else {
1346                 erp_valid = false;
1347         }
1348         changed |= ieee80211_handle_bss_capability(sdata,
1349                         le16_to_cpu(mgmt->u.beacon.capab_info),
1350                         erp_valid, erp_value);
1351
1352
1353         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1354             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1355                 struct sta_info *sta;
1356                 struct ieee80211_supported_band *sband;
1357                 u16 ap_ht_cap_flags;
1358
1359                 rcu_read_lock();
1360
1361                 sta = sta_info_get(sdata, bssid);
1362                 if (WARN_ON(!sta)) {
1363                         rcu_read_unlock();
1364                         return;
1365                 }
1366
1367                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1368
1369                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1370                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1371
1372                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1373
1374                 rcu_read_unlock();
1375
1376                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1377                                                bssid, ap_ht_cap_flags);
1378         }
1379
1380         /* Note: country IE parsing is done for us by cfg80211 */
1381         if (elems.country_elem) {
1382                 /* TODO: IBSS also needs this */
1383                 if (elems.pwr_constr_elem)
1384                         ieee80211_handle_pwr_constr(sdata,
1385                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1386                                 elems.pwr_constr_elem,
1387                                 elems.pwr_constr_elem_len);
1388         }
1389
1390         ieee80211_bss_info_change_notify(sdata, changed);
1391 }
1392
1393 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1394                                           struct sk_buff *skb)
1395 {
1396         struct ieee80211_local *local = sdata->local;
1397         struct ieee80211_mgmt *mgmt;
1398         u16 fc;
1399
1400         if (skb->len < 24)
1401                 return RX_DROP_MONITOR;
1402
1403         mgmt = (struct ieee80211_mgmt *) skb->data;
1404         fc = le16_to_cpu(mgmt->frame_control);
1405
1406         switch (fc & IEEE80211_FCTL_STYPE) {
1407         case IEEE80211_STYPE_PROBE_RESP:
1408         case IEEE80211_STYPE_BEACON:
1409         case IEEE80211_STYPE_DEAUTH:
1410         case IEEE80211_STYPE_DISASSOC:
1411         case IEEE80211_STYPE_ACTION:
1412                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1413                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1414                 return RX_QUEUED;
1415         }
1416
1417         return RX_DROP_MONITOR;
1418 }
1419
1420 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1421                                          struct sk_buff *skb)
1422 {
1423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1424         struct ieee80211_rx_status *rx_status;
1425         struct ieee80211_mgmt *mgmt;
1426         enum rx_mgmt_action rma = RX_MGMT_NONE;
1427         u16 fc;
1428
1429         rx_status = (struct ieee80211_rx_status *) skb->cb;
1430         mgmt = (struct ieee80211_mgmt *) skb->data;
1431         fc = le16_to_cpu(mgmt->frame_control);
1432
1433         mutex_lock(&ifmgd->mtx);
1434
1435         if (ifmgd->associated &&
1436             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1437                 switch (fc & IEEE80211_FCTL_STYPE) {
1438                 case IEEE80211_STYPE_BEACON:
1439                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1440                                                  rx_status);
1441                         break;
1442                 case IEEE80211_STYPE_PROBE_RESP:
1443                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1444                         break;
1445                 case IEEE80211_STYPE_DEAUTH:
1446                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1447                         break;
1448                 case IEEE80211_STYPE_DISASSOC:
1449                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1450                         break;
1451                 case IEEE80211_STYPE_ACTION:
1452                         /* XXX: differentiate, can only happen for CSA now! */
1453                         ieee80211_sta_process_chanswitch(sdata,
1454                                         &mgmt->u.action.u.chan_switch.sw_elem,
1455                                         (void *)ifmgd->associated->priv);
1456                         break;
1457                 }
1458                 mutex_unlock(&ifmgd->mtx);
1459
1460                 switch (rma) {
1461                 case RX_MGMT_NONE:
1462                         /* no action */
1463                         break;
1464                 case RX_MGMT_CFG80211_DEAUTH:
1465                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1466                         break;
1467                 case RX_MGMT_CFG80211_DISASSOC:
1468                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1469                         break;
1470                 default:
1471                         WARN(1, "unexpected: %d", rma);
1472                 }
1473                 goto out;
1474         }
1475
1476         mutex_unlock(&ifmgd->mtx);
1477
1478         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1479             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1480                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1481
1482  out:
1483         kfree_skb(skb);
1484 }
1485
1486 static void ieee80211_sta_timer(unsigned long data)
1487 {
1488         struct ieee80211_sub_if_data *sdata =
1489                 (struct ieee80211_sub_if_data *) data;
1490         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1491         struct ieee80211_local *local = sdata->local;
1492
1493         if (local->quiescing) {
1494                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1495                 return;
1496         }
1497
1498         ieee80211_queue_work(&local->hw, &ifmgd->work);
1499 }
1500
1501 static void ieee80211_sta_work(struct work_struct *work)
1502 {
1503         struct ieee80211_sub_if_data *sdata =
1504                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1505         struct ieee80211_local *local = sdata->local;
1506         struct ieee80211_if_managed *ifmgd;
1507         struct sk_buff *skb;
1508
1509         if (!ieee80211_sdata_running(sdata))
1510                 return;
1511
1512         if (local->scanning)
1513                 return;
1514
1515         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1516                 return;
1517
1518         /*
1519          * ieee80211_queue_work() should have picked up most cases,
1520          * here we'll pick the the rest.
1521          */
1522         if (WARN(local->suspended, "STA MLME work scheduled while "
1523                  "going to suspend\n"))
1524                 return;
1525
1526         ifmgd = &sdata->u.mgd;
1527
1528         /* first process frames to avoid timing out while a frame is pending */
1529         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1530                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1531
1532         /* then process the rest of the work */
1533         mutex_lock(&ifmgd->mtx);
1534
1535         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1536                             IEEE80211_STA_CONNECTION_POLL) &&
1537             ifmgd->associated) {
1538                 u8 bssid[ETH_ALEN];
1539
1540                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1541                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1542                         run_again(ifmgd, ifmgd->probe_timeout);
1543
1544                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1545 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1546                         printk(KERN_DEBUG "No probe response from AP %pM"
1547                                 " after %dms, try %d\n", bssid,
1548                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1549                                 ifmgd->probe_send_count);
1550 #endif
1551                         ieee80211_mgd_probe_ap_send(sdata);
1552                 } else {
1553                         /*
1554                          * We actually lost the connection ... or did we?
1555                          * Let's make sure!
1556                          */
1557                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1558                                           IEEE80211_STA_BEACON_POLL);
1559                         printk(KERN_DEBUG "No probe response from AP %pM"
1560                                 " after %dms, disconnecting.\n",
1561                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1562                         ieee80211_set_disassoc(sdata);
1563                         ieee80211_recalc_idle(local);
1564                         mutex_unlock(&ifmgd->mtx);
1565                         /*
1566                          * must be outside lock due to cfg80211,
1567                          * but that's not a problem.
1568                          */
1569                         ieee80211_send_deauth_disassoc(sdata, bssid,
1570                                         IEEE80211_STYPE_DEAUTH,
1571                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1572                                         NULL);
1573                         mutex_lock(&ifmgd->mtx);
1574                 }
1575         }
1576
1577         mutex_unlock(&ifmgd->mtx);
1578 }
1579
1580 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1581 {
1582         struct ieee80211_sub_if_data *sdata =
1583                 (struct ieee80211_sub_if_data *) data;
1584         struct ieee80211_local *local = sdata->local;
1585
1586         if (local->quiescing)
1587                 return;
1588
1589         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1590 }
1591
1592 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1593 {
1594         struct ieee80211_sub_if_data *sdata =
1595                 (struct ieee80211_sub_if_data *) data;
1596         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1597         struct ieee80211_local *local = sdata->local;
1598
1599         if (local->quiescing)
1600                 return;
1601
1602         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1603 }
1604
1605 static void ieee80211_sta_monitor_work(struct work_struct *work)
1606 {
1607         struct ieee80211_sub_if_data *sdata =
1608                 container_of(work, struct ieee80211_sub_if_data,
1609                              u.mgd.monitor_work);
1610
1611         ieee80211_mgd_probe_ap(sdata, false);
1612 }
1613
1614 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1615 {
1616         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1617                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1618                                         IEEE80211_STA_CONNECTION_POLL);
1619
1620                 /* let's probe the connection once */
1621                 ieee80211_queue_work(&sdata->local->hw,
1622                            &sdata->u.mgd.monitor_work);
1623                 /* and do all the other regular work too */
1624                 ieee80211_queue_work(&sdata->local->hw,
1625                            &sdata->u.mgd.work);
1626         }
1627 }
1628
1629 #ifdef CONFIG_PM
1630 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1631 {
1632         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1633
1634         /*
1635          * we need to use atomic bitops for the running bits
1636          * only because both timers might fire at the same
1637          * time -- the code here is properly synchronised.
1638          */
1639
1640         cancel_work_sync(&ifmgd->work);
1641         cancel_work_sync(&ifmgd->beacon_loss_work);
1642         if (del_timer_sync(&ifmgd->timer))
1643                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1644
1645         cancel_work_sync(&ifmgd->chswitch_work);
1646         if (del_timer_sync(&ifmgd->chswitch_timer))
1647                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1648
1649         cancel_work_sync(&ifmgd->monitor_work);
1650         /* these will just be re-established on connection */
1651         del_timer_sync(&ifmgd->conn_mon_timer);
1652         del_timer_sync(&ifmgd->bcn_mon_timer);
1653 }
1654
1655 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1656 {
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658
1659         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1660                 add_timer(&ifmgd->timer);
1661         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1662                 add_timer(&ifmgd->chswitch_timer);
1663 }
1664 #endif
1665
1666 /* interface setup */
1667 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1668 {
1669         struct ieee80211_if_managed *ifmgd;
1670
1671         ifmgd = &sdata->u.mgd;
1672         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1673         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1674         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1675         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1676         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1677                     (unsigned long) sdata);
1678         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1679                     (unsigned long) sdata);
1680         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1681                     (unsigned long) sdata);
1682         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1683                     (unsigned long) sdata);
1684         skb_queue_head_init(&ifmgd->skb_queue);
1685
1686         ifmgd->flags = 0;
1687
1688         mutex_init(&ifmgd->mtx);
1689
1690         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1691                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1692         else
1693                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1694 }
1695
1696 /* scan finished notification */
1697 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1698 {
1699         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1700
1701         /* Restart STA timers */
1702         rcu_read_lock();
1703         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1704                 ieee80211_restart_sta_timer(sdata);
1705         rcu_read_unlock();
1706 }
1707
1708 int ieee80211_max_network_latency(struct notifier_block *nb,
1709                                   unsigned long data, void *dummy)
1710 {
1711         s32 latency_usec = (s32) data;
1712         struct ieee80211_local *local =
1713                 container_of(nb, struct ieee80211_local,
1714                              network_latency_notifier);
1715
1716         mutex_lock(&local->iflist_mtx);
1717         ieee80211_recalc_ps(local, latency_usec);
1718         mutex_unlock(&local->iflist_mtx);
1719
1720         return 0;
1721 }
1722
1723 /* config hooks */
1724 static enum work_done_result
1725 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1726                           struct sk_buff *skb)
1727 {
1728         if (!skb) {
1729                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1730                 return WORK_DONE_DESTROY;
1731         }
1732
1733         if (wk->type == IEEE80211_WORK_AUTH) {
1734                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1735                 return WORK_DONE_DESTROY;
1736         }
1737
1738         mutex_lock(&wk->sdata->u.mgd.mtx);
1739         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1740         mutex_unlock(&wk->sdata->u.mgd.mtx);
1741
1742         wk->type = IEEE80211_WORK_AUTH;
1743         wk->probe_auth.tries = 0;
1744         return WORK_DONE_REQUEUE;
1745 }
1746
1747 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1748                        struct cfg80211_auth_request *req)
1749 {
1750         const u8 *ssid;
1751         struct ieee80211_work *wk;
1752         u16 auth_alg;
1753
1754         switch (req->auth_type) {
1755         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1756                 auth_alg = WLAN_AUTH_OPEN;
1757                 break;
1758         case NL80211_AUTHTYPE_SHARED_KEY:
1759                 auth_alg = WLAN_AUTH_SHARED_KEY;
1760                 break;
1761         case NL80211_AUTHTYPE_FT:
1762                 auth_alg = WLAN_AUTH_FT;
1763                 break;
1764         case NL80211_AUTHTYPE_NETWORK_EAP:
1765                 auth_alg = WLAN_AUTH_LEAP;
1766                 break;
1767         default:
1768                 return -EOPNOTSUPP;
1769         }
1770
1771         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1772         if (!wk)
1773                 return -ENOMEM;
1774
1775         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);;
1776
1777         if (req->ie && req->ie_len) {
1778                 memcpy(wk->ie, req->ie, req->ie_len);
1779                 wk->ie_len = req->ie_len;
1780         }
1781
1782         if (req->key && req->key_len) {
1783                 wk->probe_auth.key_len = req->key_len;
1784                 wk->probe_auth.key_idx = req->key_idx;
1785                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1786         }
1787
1788         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1789         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1790         wk->probe_auth.ssid_len = ssid[1];
1791
1792         wk->probe_auth.algorithm = auth_alg;
1793         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1794
1795         wk->type = IEEE80211_WORK_DIRECT_PROBE;
1796         wk->chan = req->bss->channel;
1797         wk->sdata = sdata;
1798         wk->done = ieee80211_probe_auth_done;
1799
1800         /*
1801          * XXX: if still associated need to tell AP that we're going
1802          *      to sleep and then change channel etc.
1803          *      For now switch channel here, later will be handled
1804          *      by submitting this as an off-channel work item.
1805          */
1806         sdata->local->oper_channel = req->bss->channel;
1807         ieee80211_hw_config(sdata->local, 0);
1808
1809         ieee80211_add_work(wk);
1810         return 0;
1811 }
1812
1813 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1814                                                   struct sk_buff *skb)
1815 {
1816         struct ieee80211_mgmt *mgmt;
1817         u16 status;
1818
1819         if (!skb) {
1820                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1821                 return WORK_DONE_DESTROY;
1822         }
1823
1824         mgmt = (void *)skb->data;
1825         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1826
1827         if (status == WLAN_STATUS_SUCCESS) {
1828                 mutex_lock(&wk->sdata->u.mgd.mtx);
1829                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1830                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1831                         /* oops -- internal error -- send timeout for now */
1832                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1833                                                     wk->filter_ta);
1834                         return WORK_DONE_DESTROY;
1835                 }
1836                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1837         }
1838
1839         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1840         return WORK_DONE_DESTROY;
1841 }
1842
1843 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1844                         struct cfg80211_assoc_request *req)
1845 {
1846         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1847         struct ieee80211_bss *bss = (void *)req->bss->priv;
1848         struct ieee80211_work *wk;
1849         const u8 *ssid;
1850         int i;
1851
1852         mutex_lock(&ifmgd->mtx);
1853         if (ifmgd->associated) {
1854                 mutex_unlock(&ifmgd->mtx);
1855                 return -EALREADY;
1856         }
1857         mutex_unlock(&ifmgd->mtx);
1858
1859         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1860         if (!wk)
1861                 return -ENOMEM;
1862
1863         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1864
1865         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1866                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1867                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1868                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1869                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1870
1871
1872         if (req->ie && req->ie_len) {
1873                 memcpy(wk->ie, req->ie, req->ie_len);
1874                 wk->ie_len = req->ie_len;
1875         } else
1876                 wk->ie_len = 0;
1877
1878         wk->assoc.bss = req->bss;
1879
1880         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1881
1882         /* new association always uses requested smps mode */
1883         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1884                 if (ifmgd->powersave)
1885                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1886                 else
1887                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1888         } else
1889                 ifmgd->ap_smps = ifmgd->req_smps;
1890
1891         wk->assoc.smps = ifmgd->ap_smps;
1892         /*
1893          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1894          * We still associate in non-HT mode (11a/b/g) if any one of these
1895          * ciphers is configured as pairwise.
1896          * We can set this to true for non-11n hardware, that'll be checked
1897          * separately along with the peer capabilities.
1898          */
1899         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1900         wk->assoc.capability = req->bss->capability;
1901         wk->assoc.wmm_used = bss->wmm_used;
1902         wk->assoc.supp_rates = bss->supp_rates;
1903         wk->assoc.supp_rates_len = bss->supp_rates_len;
1904         wk->assoc.ht_information_ie =
1905                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1906
1907         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1908         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1909         wk->assoc.ssid_len = ssid[1];
1910
1911         if (req->prev_bssid)
1912                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1913
1914         wk->type = IEEE80211_WORK_ASSOC;
1915         wk->chan = req->bss->channel;
1916         wk->sdata = sdata;
1917         wk->done = ieee80211_assoc_done;
1918
1919         if (req->use_mfp) {
1920                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1921                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1922         } else {
1923                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1924                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1925         }
1926
1927         if (req->crypto.control_port)
1928                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1929         else
1930                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1931
1932         sdata->local->oper_channel = req->bss->channel;
1933         ieee80211_hw_config(sdata->local, 0);
1934
1935         ieee80211_add_work(wk);
1936         return 0;
1937 }
1938
1939 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1940                          struct cfg80211_deauth_request *req,
1941                          void *cookie)
1942 {
1943         struct ieee80211_local *local = sdata->local;
1944         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1945         struct ieee80211_work *wk;
1946         const u8 *bssid = req->bss->bssid;
1947
1948         mutex_lock(&ifmgd->mtx);
1949
1950         if (ifmgd->associated == req->bss) {
1951                 bssid = req->bss->bssid;
1952                 ieee80211_set_disassoc(sdata);
1953                 mutex_unlock(&ifmgd->mtx);
1954         } else {
1955                 bool not_auth_yet = false;
1956
1957                 mutex_unlock(&ifmgd->mtx);
1958
1959                 mutex_lock(&local->work_mtx);
1960                 list_for_each_entry(wk, &local->work_list, list) {
1961                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
1962                                 continue;
1963                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
1964                                 continue;
1965                         not_auth_yet = true;
1966                         list_del(&wk->list);
1967                         free_work(wk);
1968                         break;
1969                 }
1970                 mutex_unlock(&local->work_mtx);
1971
1972                 /*
1973                  * If somebody requests authentication and we haven't
1974                  * sent out an auth frame yet there's no need to send
1975                  * out a deauth frame either. If the state was PROBE,
1976                  * then this is the case. If it's AUTH we have sent a
1977                  * frame, and if it's IDLE we have completed the auth
1978                  * process already.
1979                  */
1980                 if (not_auth_yet) {
1981                         __cfg80211_auth_canceled(sdata->dev, bssid);
1982                         return 0;
1983                 }
1984         }
1985
1986         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
1987                sdata->name, bssid, req->reason_code);
1988
1989         ieee80211_send_deauth_disassoc(sdata, bssid,
1990                         IEEE80211_STYPE_DEAUTH, req->reason_code,
1991                         cookie);
1992
1993         ieee80211_recalc_idle(sdata->local);
1994
1995         return 0;
1996 }
1997
1998 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
1999                            struct cfg80211_disassoc_request *req,
2000                            void *cookie)
2001 {
2002         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2003
2004         mutex_lock(&ifmgd->mtx);
2005
2006         /*
2007          * cfg80211 should catch this ... but it's racy since
2008          * we can receive a disassoc frame, process it, hand it
2009          * to cfg80211 while that's in a locked section already
2010          * trying to tell us that the user wants to disconnect.
2011          */
2012         if (ifmgd->associated != req->bss) {
2013                 mutex_unlock(&ifmgd->mtx);
2014                 return -ENOLINK;
2015         }
2016
2017         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2018                sdata->name, req->bss->bssid, req->reason_code);
2019
2020         ieee80211_set_disassoc(sdata);
2021
2022         mutex_unlock(&ifmgd->mtx);
2023
2024         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2025                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2026                         cookie);
2027
2028         ieee80211_recalc_idle(sdata->local);
2029
2030         return 0;
2031 }