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_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_tx_start_all_queues(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_tx_stop_all_queues(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         local->oper_channel = wk->chan;
1109
1110         if (elems.ht_info_elem && elems.wmm_param &&
1111             (sdata->local->hw.queues >= 4) &&
1112             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1113                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1114                                                cbss->bssid, ap_ht_cap_flags);
1115
1116         /* set AID and assoc capability,
1117          * ieee80211_set_associated() will tell the driver */
1118         bss_conf->aid = aid;
1119         bss_conf->assoc_capability = capab_info;
1120         ieee80211_set_associated(sdata, cbss, changed);
1121
1122         /*
1123          * Start timer to probe the connection to the AP now.
1124          * Also start the timer that will detect beacon loss.
1125          */
1126         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1127         mod_beacon_timer(sdata);
1128
1129         return true;
1130 }
1131
1132
1133 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1134                                   struct ieee80211_mgmt *mgmt,
1135                                   size_t len,
1136                                   struct ieee80211_rx_status *rx_status,
1137                                   struct ieee802_11_elems *elems,
1138                                   bool beacon)
1139 {
1140         struct ieee80211_local *local = sdata->local;
1141         int freq;
1142         struct ieee80211_bss *bss;
1143         struct ieee80211_channel *channel;
1144
1145         if (elems->ds_params && elems->ds_params_len == 1)
1146                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1147         else
1148                 freq = rx_status->freq;
1149
1150         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1151
1152         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1153                 return;
1154
1155         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1156                                         channel, beacon);
1157         if (bss)
1158                 ieee80211_rx_bss_put(local, bss);
1159
1160         if (!sdata->u.mgd.associated)
1161                 return;
1162
1163         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1164             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1165                                                         ETH_ALEN) == 0)) {
1166                 struct ieee80211_channel_sw_ie *sw_elem =
1167                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1168                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1169         }
1170 }
1171
1172
1173 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1174                                          struct sk_buff *skb)
1175 {
1176         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1177         struct ieee80211_if_managed *ifmgd;
1178         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1179         size_t baselen, len = skb->len;
1180         struct ieee802_11_elems elems;
1181
1182         ifmgd = &sdata->u.mgd;
1183
1184         ASSERT_MGD_MTX(ifmgd);
1185
1186         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1187                 return; /* ignore ProbeResp to foreign address */
1188
1189         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1190         if (baselen > len)
1191                 return;
1192
1193         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1194                                 &elems);
1195
1196         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1197
1198         if (ifmgd->associated &&
1199             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1200             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1201                             IEEE80211_STA_CONNECTION_POLL)) {
1202                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1203                                   IEEE80211_STA_BEACON_POLL);
1204                 mutex_lock(&sdata->local->iflist_mtx);
1205                 ieee80211_recalc_ps(sdata->local, -1);
1206                 mutex_unlock(&sdata->local->iflist_mtx);
1207                 /*
1208                  * We've received a probe response, but are not sure whether
1209                  * we have or will be receiving any beacons or data, so let's
1210                  * schedule the timers again, just in case.
1211                  */
1212                 mod_beacon_timer(sdata);
1213                 mod_timer(&ifmgd->conn_mon_timer,
1214                           round_jiffies_up(jiffies +
1215                                            IEEE80211_CONNECTION_IDLE_TIME));
1216         }
1217 }
1218
1219 /*
1220  * This is the canonical list of information elements we care about,
1221  * the filter code also gives us all changes to the Microsoft OUI
1222  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1223  *
1224  * We implement beacon filtering in software since that means we can
1225  * avoid processing the frame here and in cfg80211, and userspace
1226  * will not be able to tell whether the hardware supports it or not.
1227  *
1228  * XXX: This list needs to be dynamic -- userspace needs to be able to
1229  *      add items it requires. It also needs to be able to tell us to
1230  *      look out for other vendor IEs.
1231  */
1232 static const u64 care_about_ies =
1233         (1ULL << WLAN_EID_COUNTRY) |
1234         (1ULL << WLAN_EID_ERP_INFO) |
1235         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1236         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1237         (1ULL << WLAN_EID_HT_CAPABILITY) |
1238         (1ULL << WLAN_EID_HT_INFORMATION);
1239
1240 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1241                                      struct ieee80211_mgmt *mgmt,
1242                                      size_t len,
1243                                      struct ieee80211_rx_status *rx_status)
1244 {
1245         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1246         size_t baselen;
1247         struct ieee802_11_elems elems;
1248         struct ieee80211_local *local = sdata->local;
1249         u32 changed = 0;
1250         bool erp_valid, directed_tim = false;
1251         u8 erp_value = 0;
1252         u32 ncrc;
1253         u8 *bssid;
1254
1255         ASSERT_MGD_MTX(ifmgd);
1256
1257         /* Process beacon from the current BSS */
1258         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1259         if (baselen > len)
1260                 return;
1261
1262         if (rx_status->freq != local->hw.conf.channel->center_freq)
1263                 return;
1264
1265         /*
1266          * We might have received a number of frames, among them a
1267          * disassoc frame and a beacon...
1268          */
1269         if (!ifmgd->associated)
1270                 return;
1271
1272         bssid = ifmgd->associated->bssid;
1273
1274         /*
1275          * And in theory even frames from a different AP we were just
1276          * associated to a split-second ago!
1277          */
1278         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1279                 return;
1280
1281         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1282 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1283                 if (net_ratelimit()) {
1284                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1285                                "to a received beacon\n", sdata->name);
1286                 }
1287 #endif
1288                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1289                 mutex_lock(&local->iflist_mtx);
1290                 ieee80211_recalc_ps(local, -1);
1291                 mutex_unlock(&local->iflist_mtx);
1292         }
1293
1294         /*
1295          * Push the beacon loss detection into the future since
1296          * we are processing a beacon from the AP just now.
1297          */
1298         mod_beacon_timer(sdata);
1299
1300         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1301         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1302                                           len - baselen, &elems,
1303                                           care_about_ies, ncrc);
1304
1305         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1306                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1307                                                    ifmgd->aid);
1308
1309         if (ncrc != ifmgd->beacon_crc) {
1310                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1311                                       true);
1312
1313                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1314                                          elems.wmm_param_len);
1315         }
1316
1317         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1318                 if (directed_tim) {
1319                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1320                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1321                                 ieee80211_hw_config(local,
1322                                                     IEEE80211_CONF_CHANGE_PS);
1323                                 ieee80211_send_nullfunc(local, sdata, 0);
1324                         } else {
1325                                 local->pspolling = true;
1326
1327                                 /*
1328                                  * Here is assumed that the driver will be
1329                                  * able to send ps-poll frame and receive a
1330                                  * response even though power save mode is
1331                                  * enabled, but some drivers might require
1332                                  * to disable power save here. This needs
1333                                  * to be investigated.
1334                                  */
1335                                 ieee80211_send_pspoll(local, sdata);
1336                         }
1337                 }
1338         }
1339
1340         if (ncrc == ifmgd->beacon_crc)
1341                 return;
1342         ifmgd->beacon_crc = ncrc;
1343
1344         if (elems.erp_info && elems.erp_info_len >= 1) {
1345                 erp_valid = true;
1346                 erp_value = elems.erp_info[0];
1347         } else {
1348                 erp_valid = false;
1349         }
1350         changed |= ieee80211_handle_bss_capability(sdata,
1351                         le16_to_cpu(mgmt->u.beacon.capab_info),
1352                         erp_valid, erp_value);
1353
1354
1355         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1356             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1357                 struct sta_info *sta;
1358                 struct ieee80211_supported_band *sband;
1359                 u16 ap_ht_cap_flags;
1360
1361                 rcu_read_lock();
1362
1363                 sta = sta_info_get(sdata, bssid);
1364                 if (WARN_ON(!sta)) {
1365                         rcu_read_unlock();
1366                         return;
1367                 }
1368
1369                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1370
1371                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1372                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1373
1374                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1375
1376                 rcu_read_unlock();
1377
1378                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1379                                                bssid, ap_ht_cap_flags);
1380         }
1381
1382         /* Note: country IE parsing is done for us by cfg80211 */
1383         if (elems.country_elem) {
1384                 /* TODO: IBSS also needs this */
1385                 if (elems.pwr_constr_elem)
1386                         ieee80211_handle_pwr_constr(sdata,
1387                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1388                                 elems.pwr_constr_elem,
1389                                 elems.pwr_constr_elem_len);
1390         }
1391
1392         ieee80211_bss_info_change_notify(sdata, changed);
1393 }
1394
1395 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1396                                           struct sk_buff *skb)
1397 {
1398         struct ieee80211_local *local = sdata->local;
1399         struct ieee80211_mgmt *mgmt;
1400         u16 fc;
1401
1402         if (skb->len < 24)
1403                 return RX_DROP_MONITOR;
1404
1405         mgmt = (struct ieee80211_mgmt *) skb->data;
1406         fc = le16_to_cpu(mgmt->frame_control);
1407
1408         switch (fc & IEEE80211_FCTL_STYPE) {
1409         case IEEE80211_STYPE_PROBE_RESP:
1410         case IEEE80211_STYPE_BEACON:
1411         case IEEE80211_STYPE_DEAUTH:
1412         case IEEE80211_STYPE_DISASSOC:
1413         case IEEE80211_STYPE_ACTION:
1414                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1415                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1416                 return RX_QUEUED;
1417         }
1418
1419         return RX_DROP_MONITOR;
1420 }
1421
1422 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1423                                          struct sk_buff *skb)
1424 {
1425         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1426         struct ieee80211_rx_status *rx_status;
1427         struct ieee80211_mgmt *mgmt;
1428         enum rx_mgmt_action rma = RX_MGMT_NONE;
1429         u16 fc;
1430
1431         rx_status = (struct ieee80211_rx_status *) skb->cb;
1432         mgmt = (struct ieee80211_mgmt *) skb->data;
1433         fc = le16_to_cpu(mgmt->frame_control);
1434
1435         mutex_lock(&ifmgd->mtx);
1436
1437         if (ifmgd->associated &&
1438             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1439                 switch (fc & IEEE80211_FCTL_STYPE) {
1440                 case IEEE80211_STYPE_BEACON:
1441                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1442                                                  rx_status);
1443                         break;
1444                 case IEEE80211_STYPE_PROBE_RESP:
1445                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1446                         break;
1447                 case IEEE80211_STYPE_DEAUTH:
1448                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1449                         break;
1450                 case IEEE80211_STYPE_DISASSOC:
1451                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1452                         break;
1453                 case IEEE80211_STYPE_ACTION:
1454                         /* XXX: differentiate, can only happen for CSA now! */
1455                         ieee80211_sta_process_chanswitch(sdata,
1456                                         &mgmt->u.action.u.chan_switch.sw_elem,
1457                                         (void *)ifmgd->associated->priv);
1458                         break;
1459                 }
1460                 mutex_unlock(&ifmgd->mtx);
1461
1462                 switch (rma) {
1463                 case RX_MGMT_NONE:
1464                         /* no action */
1465                         break;
1466                 case RX_MGMT_CFG80211_DEAUTH:
1467                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1468                         break;
1469                 case RX_MGMT_CFG80211_DISASSOC:
1470                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1471                         break;
1472                 default:
1473                         WARN(1, "unexpected: %d", rma);
1474                 }
1475                 goto out;
1476         }
1477
1478         mutex_unlock(&ifmgd->mtx);
1479
1480         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1481             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1482                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1483
1484  out:
1485         kfree_skb(skb);
1486 }
1487
1488 static void ieee80211_sta_timer(unsigned long data)
1489 {
1490         struct ieee80211_sub_if_data *sdata =
1491                 (struct ieee80211_sub_if_data *) data;
1492         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1493         struct ieee80211_local *local = sdata->local;
1494
1495         if (local->quiescing) {
1496                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1497                 return;
1498         }
1499
1500         ieee80211_queue_work(&local->hw, &ifmgd->work);
1501 }
1502
1503 static void ieee80211_sta_work(struct work_struct *work)
1504 {
1505         struct ieee80211_sub_if_data *sdata =
1506                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1507         struct ieee80211_local *local = sdata->local;
1508         struct ieee80211_if_managed *ifmgd;
1509         struct sk_buff *skb;
1510
1511         if (!ieee80211_sdata_running(sdata))
1512                 return;
1513
1514         if (local->scanning)
1515                 return;
1516
1517         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1518                 return;
1519
1520         /*
1521          * ieee80211_queue_work() should have picked up most cases,
1522          * here we'll pick the the rest.
1523          */
1524         if (WARN(local->suspended, "STA MLME work scheduled while "
1525                  "going to suspend\n"))
1526                 return;
1527
1528         ifmgd = &sdata->u.mgd;
1529
1530         /* first process frames to avoid timing out while a frame is pending */
1531         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1532                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1533
1534         /* then process the rest of the work */
1535         mutex_lock(&ifmgd->mtx);
1536
1537         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1538                             IEEE80211_STA_CONNECTION_POLL) &&
1539             ifmgd->associated) {
1540                 u8 bssid[ETH_ALEN];
1541
1542                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1543                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1544                         run_again(ifmgd, ifmgd->probe_timeout);
1545
1546                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1547 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1548                         printk(KERN_DEBUG "No probe response from AP %pM"
1549                                 " after %dms, try %d\n", bssid,
1550                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1551                                 ifmgd->probe_send_count);
1552 #endif
1553                         ieee80211_mgd_probe_ap_send(sdata);
1554                 } else {
1555                         /*
1556                          * We actually lost the connection ... or did we?
1557                          * Let's make sure!
1558                          */
1559                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1560                                           IEEE80211_STA_BEACON_POLL);
1561                         printk(KERN_DEBUG "No probe response from AP %pM"
1562                                 " after %dms, disconnecting.\n",
1563                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1564                         ieee80211_set_disassoc(sdata);
1565                         ieee80211_recalc_idle(local);
1566                         mutex_unlock(&ifmgd->mtx);
1567                         /*
1568                          * must be outside lock due to cfg80211,
1569                          * but that's not a problem.
1570                          */
1571                         ieee80211_send_deauth_disassoc(sdata, bssid,
1572                                         IEEE80211_STYPE_DEAUTH,
1573                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1574                                         NULL);
1575                         mutex_lock(&ifmgd->mtx);
1576                 }
1577         }
1578
1579         mutex_unlock(&ifmgd->mtx);
1580 }
1581
1582 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1583 {
1584         struct ieee80211_sub_if_data *sdata =
1585                 (struct ieee80211_sub_if_data *) data;
1586         struct ieee80211_local *local = sdata->local;
1587
1588         if (local->quiescing)
1589                 return;
1590
1591         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1592 }
1593
1594 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1595 {
1596         struct ieee80211_sub_if_data *sdata =
1597                 (struct ieee80211_sub_if_data *) data;
1598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1599         struct ieee80211_local *local = sdata->local;
1600
1601         if (local->quiescing)
1602                 return;
1603
1604         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1605 }
1606
1607 static void ieee80211_sta_monitor_work(struct work_struct *work)
1608 {
1609         struct ieee80211_sub_if_data *sdata =
1610                 container_of(work, struct ieee80211_sub_if_data,
1611                              u.mgd.monitor_work);
1612
1613         ieee80211_mgd_probe_ap(sdata, false);
1614 }
1615
1616 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1617 {
1618         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1619                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1620                                         IEEE80211_STA_CONNECTION_POLL);
1621
1622                 /* let's probe the connection once */
1623                 ieee80211_queue_work(&sdata->local->hw,
1624                            &sdata->u.mgd.monitor_work);
1625                 /* and do all the other regular work too */
1626                 ieee80211_queue_work(&sdata->local->hw,
1627                            &sdata->u.mgd.work);
1628         }
1629 }
1630
1631 #ifdef CONFIG_PM
1632 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1633 {
1634         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1635
1636         /*
1637          * we need to use atomic bitops for the running bits
1638          * only because both timers might fire at the same
1639          * time -- the code here is properly synchronised.
1640          */
1641
1642         cancel_work_sync(&ifmgd->work);
1643         cancel_work_sync(&ifmgd->beacon_loss_work);
1644         if (del_timer_sync(&ifmgd->timer))
1645                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1646
1647         cancel_work_sync(&ifmgd->chswitch_work);
1648         if (del_timer_sync(&ifmgd->chswitch_timer))
1649                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1650
1651         cancel_work_sync(&ifmgd->monitor_work);
1652         /* these will just be re-established on connection */
1653         del_timer_sync(&ifmgd->conn_mon_timer);
1654         del_timer_sync(&ifmgd->bcn_mon_timer);
1655 }
1656
1657 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1658 {
1659         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1660
1661         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1662                 add_timer(&ifmgd->timer);
1663         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1664                 add_timer(&ifmgd->chswitch_timer);
1665 }
1666 #endif
1667
1668 /* interface setup */
1669 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1670 {
1671         struct ieee80211_if_managed *ifmgd;
1672
1673         ifmgd = &sdata->u.mgd;
1674         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1675         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1676         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1677         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1678         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1679                     (unsigned long) sdata);
1680         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1681                     (unsigned long) sdata);
1682         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1683                     (unsigned long) sdata);
1684         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1685                     (unsigned long) sdata);
1686         skb_queue_head_init(&ifmgd->skb_queue);
1687
1688         ifmgd->flags = 0;
1689
1690         mutex_init(&ifmgd->mtx);
1691
1692         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1693                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1694         else
1695                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1696 }
1697
1698 /* scan finished notification */
1699 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1700 {
1701         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1702
1703         /* Restart STA timers */
1704         rcu_read_lock();
1705         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1706                 ieee80211_restart_sta_timer(sdata);
1707         rcu_read_unlock();
1708 }
1709
1710 int ieee80211_max_network_latency(struct notifier_block *nb,
1711                                   unsigned long data, void *dummy)
1712 {
1713         s32 latency_usec = (s32) data;
1714         struct ieee80211_local *local =
1715                 container_of(nb, struct ieee80211_local,
1716                              network_latency_notifier);
1717
1718         mutex_lock(&local->iflist_mtx);
1719         ieee80211_recalc_ps(local, latency_usec);
1720         mutex_unlock(&local->iflist_mtx);
1721
1722         return 0;
1723 }
1724
1725 /* config hooks */
1726 static enum work_done_result
1727 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1728                           struct sk_buff *skb)
1729 {
1730         if (!skb) {
1731                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1732                 return WORK_DONE_DESTROY;
1733         }
1734
1735         if (wk->type == IEEE80211_WORK_AUTH) {
1736                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1737                 return WORK_DONE_DESTROY;
1738         }
1739
1740         mutex_lock(&wk->sdata->u.mgd.mtx);
1741         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1742         mutex_unlock(&wk->sdata->u.mgd.mtx);
1743
1744         wk->type = IEEE80211_WORK_AUTH;
1745         wk->probe_auth.tries = 0;
1746         return WORK_DONE_REQUEUE;
1747 }
1748
1749 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1750                        struct cfg80211_auth_request *req)
1751 {
1752         const u8 *ssid;
1753         struct ieee80211_work *wk;
1754         u16 auth_alg;
1755
1756         switch (req->auth_type) {
1757         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1758                 auth_alg = WLAN_AUTH_OPEN;
1759                 break;
1760         case NL80211_AUTHTYPE_SHARED_KEY:
1761                 auth_alg = WLAN_AUTH_SHARED_KEY;
1762                 break;
1763         case NL80211_AUTHTYPE_FT:
1764                 auth_alg = WLAN_AUTH_FT;
1765                 break;
1766         case NL80211_AUTHTYPE_NETWORK_EAP:
1767                 auth_alg = WLAN_AUTH_LEAP;
1768                 break;
1769         default:
1770                 return -EOPNOTSUPP;
1771         }
1772
1773         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1774         if (!wk)
1775                 return -ENOMEM;
1776
1777         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);;
1778
1779         if (req->ie && req->ie_len) {
1780                 memcpy(wk->ie, req->ie, req->ie_len);
1781                 wk->ie_len = req->ie_len;
1782         }
1783
1784         if (req->key && req->key_len) {
1785                 wk->probe_auth.key_len = req->key_len;
1786                 wk->probe_auth.key_idx = req->key_idx;
1787                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1788         }
1789
1790         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1791         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1792         wk->probe_auth.ssid_len = ssid[1];
1793
1794         wk->probe_auth.algorithm = auth_alg;
1795         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1796
1797         wk->type = IEEE80211_WORK_DIRECT_PROBE;
1798         wk->chan = req->bss->channel;
1799         wk->sdata = sdata;
1800         wk->done = ieee80211_probe_auth_done;
1801
1802         ieee80211_add_work(wk);
1803         return 0;
1804 }
1805
1806 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1807                                                   struct sk_buff *skb)
1808 {
1809         struct ieee80211_mgmt *mgmt;
1810         u16 status;
1811
1812         if (!skb) {
1813                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1814                 return WORK_DONE_DESTROY;
1815         }
1816
1817         mgmt = (void *)skb->data;
1818         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1819
1820         if (status == WLAN_STATUS_SUCCESS) {
1821                 mutex_lock(&wk->sdata->u.mgd.mtx);
1822                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1823                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1824                         /* oops -- internal error -- send timeout for now */
1825                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1826                                                     wk->filter_ta);
1827                         return WORK_DONE_DESTROY;
1828                 }
1829                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1830         }
1831
1832         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1833         return WORK_DONE_DESTROY;
1834 }
1835
1836 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1837                         struct cfg80211_assoc_request *req)
1838 {
1839         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1840         struct ieee80211_bss *bss = (void *)req->bss->priv;
1841         struct ieee80211_work *wk;
1842         const u8 *ssid;
1843         int i;
1844
1845         mutex_lock(&ifmgd->mtx);
1846         if (ifmgd->associated) {
1847                 mutex_unlock(&ifmgd->mtx);
1848                 return -EALREADY;
1849         }
1850         mutex_unlock(&ifmgd->mtx);
1851
1852         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1853         if (!wk)
1854                 return -ENOMEM;
1855
1856         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1857
1858         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1859                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1860                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1861                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1862                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1863
1864
1865         if (req->ie && req->ie_len) {
1866                 memcpy(wk->ie, req->ie, req->ie_len);
1867                 wk->ie_len = req->ie_len;
1868         } else
1869                 wk->ie_len = 0;
1870
1871         wk->assoc.bss = req->bss;
1872
1873         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1874
1875         /* new association always uses requested smps mode */
1876         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1877                 if (ifmgd->powersave)
1878                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1879                 else
1880                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1881         } else
1882                 ifmgd->ap_smps = ifmgd->req_smps;
1883
1884         wk->assoc.smps = ifmgd->ap_smps;
1885         /*
1886          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1887          * We still associate in non-HT mode (11a/b/g) if any one of these
1888          * ciphers is configured as pairwise.
1889          * We can set this to true for non-11n hardware, that'll be checked
1890          * separately along with the peer capabilities.
1891          */
1892         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1893         wk->assoc.capability = req->bss->capability;
1894         wk->assoc.wmm_used = bss->wmm_used;
1895         wk->assoc.supp_rates = bss->supp_rates;
1896         wk->assoc.supp_rates_len = bss->supp_rates_len;
1897         wk->assoc.ht_information_ie =
1898                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1899
1900         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1901         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1902         wk->assoc.ssid_len = ssid[1];
1903
1904         if (req->prev_bssid)
1905                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1906
1907         wk->type = IEEE80211_WORK_ASSOC;
1908         wk->chan = req->bss->channel;
1909         wk->sdata = sdata;
1910         wk->done = ieee80211_assoc_done;
1911
1912         if (req->use_mfp) {
1913                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1914                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1915         } else {
1916                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1917                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1918         }
1919
1920         if (req->crypto.control_port)
1921                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1922         else
1923                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1924
1925         ieee80211_add_work(wk);
1926         return 0;
1927 }
1928
1929 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1930                          struct cfg80211_deauth_request *req,
1931                          void *cookie)
1932 {
1933         struct ieee80211_local *local = sdata->local;
1934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1935         struct ieee80211_work *wk;
1936         const u8 *bssid = req->bss->bssid;
1937
1938         mutex_lock(&ifmgd->mtx);
1939
1940         if (ifmgd->associated == req->bss) {
1941                 bssid = req->bss->bssid;
1942                 ieee80211_set_disassoc(sdata);
1943                 mutex_unlock(&ifmgd->mtx);
1944         } else {
1945                 bool not_auth_yet = false;
1946
1947                 mutex_unlock(&ifmgd->mtx);
1948
1949                 mutex_lock(&local->work_mtx);
1950                 list_for_each_entry(wk, &local->work_list, list) {
1951                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
1952                                 continue;
1953                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
1954                                 continue;
1955                         not_auth_yet = true;
1956                         list_del(&wk->list);
1957                         free_work(wk);
1958                         break;
1959                 }
1960                 mutex_unlock(&local->work_mtx);
1961
1962                 /*
1963                  * If somebody requests authentication and we haven't
1964                  * sent out an auth frame yet there's no need to send
1965                  * out a deauth frame either. If the state was PROBE,
1966                  * then this is the case. If it's AUTH we have sent a
1967                  * frame, and if it's IDLE we have completed the auth
1968                  * process already.
1969                  */
1970                 if (not_auth_yet) {
1971                         __cfg80211_auth_canceled(sdata->dev, bssid);
1972                         return 0;
1973                 }
1974         }
1975
1976         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
1977                sdata->name, bssid, req->reason_code);
1978
1979         ieee80211_send_deauth_disassoc(sdata, bssid,
1980                         IEEE80211_STYPE_DEAUTH, req->reason_code,
1981                         cookie);
1982
1983         ieee80211_recalc_idle(sdata->local);
1984
1985         return 0;
1986 }
1987
1988 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
1989                            struct cfg80211_disassoc_request *req,
1990                            void *cookie)
1991 {
1992         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1993
1994         mutex_lock(&ifmgd->mtx);
1995
1996         /*
1997          * cfg80211 should catch this ... but it's racy since
1998          * we can receive a disassoc frame, process it, hand it
1999          * to cfg80211 while that's in a locked section already
2000          * trying to tell us that the user wants to disconnect.
2001          */
2002         if (ifmgd->associated != req->bss) {
2003                 mutex_unlock(&ifmgd->mtx);
2004                 return -ENOLINK;
2005         }
2006
2007         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2008                sdata->name, req->bss->bssid, req->reason_code);
2009
2010         ieee80211_set_disassoc(sdata);
2011
2012         mutex_unlock(&ifmgd->mtx);
2013
2014         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2015                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2016                         cookie);
2017
2018         ieee80211_recalc_idle(sdata->local);
2019
2020         return 0;
2021 }