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