net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_MAX_PROBE_TRIES 5
  32
  33 /*
  34  * beacon loss detection timeout
  35  * XXX: should depend on beacon interval
  36  */
  37 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  38 /*
  39  * Time the connection can be idle before we probe
  40  * it to see if we can still talk to the AP.
  41  */
  42 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  43 /*
  44  * Time we wait for a probe response after sending
  45  * a probe request because of beacon loss or for
  46  * checking the connection still works.
  47  */
  48 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  49
  50 /*
  51  * Weight given to the latest Beacon frame when calculating average signal
  52  * strength for Beacon frames received in the current BSS. This must be
  53  * between 1 and 15.
  54  */
  55 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  56
  57 #define TMR_RUNNING_TIMER       0
  58 #define TMR_RUNNING_CHANSW      1
  59
  60 /*
  61  * All cfg80211 functions have to be called outside a locked
  62  * section so that they can acquire a lock themselves... This
  63  * is much simpler than queuing up things in cfg80211, but we
  64  * do need some indirection for that here.
  65  */
  66 enum rx_mgmt_action {
  67         /* no action required */
  68         RX_MGMT_NONE,
  69
  70         /* caller must call cfg80211_send_rx_auth() */
  71         RX_MGMT_CFG80211_AUTH,
  72
  73         /* caller must call cfg80211_send_rx_assoc() */
  74         RX_MGMT_CFG80211_ASSOC,
  75
  76         /* caller must call cfg80211_send_deauth() */
  77         RX_MGMT_CFG80211_DEAUTH,
  78
  79         /* caller must call cfg80211_send_disassoc() */
  80         RX_MGMT_CFG80211_DISASSOC,
  81
  82         /* caller must tell cfg80211 about internal error */
  83         RX_MGMT_CFG80211_ASSOC_ERROR,
  84 };
  85
  86 /* utils */
  87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  88 {
  89         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  90 }
  91
  92 /*
  93  * We can have multiple work items (and connection probing)
  94  * scheduling this timer, but we need to take care to only
  95  * reschedule it when it should fire _earlier_ than it was
  96  * asked for before, or if it's not pending right now. This
  97  * function ensures that. Note that it then is required to
  98  * run this function for all timeouts after the first one
  99  * has happened -- the work that runs from this timer will
 100  * do that.
 101  */
 102 static void run_again(struct ieee80211_if_managed *ifmgd,
 103                              unsigned long timeout)
 104 {
 105         ASSERT_MGD_MTX(ifmgd);
 106
 107         if (!timer_pending(&ifmgd->timer) ||
 108             time_before(timeout, ifmgd->timer.expires))
 109                 mod_timer(&ifmgd->timer, timeout);
 110 }
 111
 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 113 {
 114         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 119 }
 120
 121 static int ecw2cw(int ecw)
 122 {
 123         return (1 << ecw) - 1;
 124 }
 125
 126 /*
 127  * ieee80211_enable_ht should be called only after the operating band
 128  * has been determined as ht configuration depends on the hw's
 129  * HT abilities for a specific band.
 130  */
 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 132                                struct ieee80211_ht_info *hti,
 133                                const u8 *bssid, u16 ap_ht_cap_flags)
 134 {
 135         struct ieee80211_local *local = sdata->local;
 136         struct ieee80211_supported_band *sband;
 137         struct sta_info *sta;
 138         u32 changed = 0;
 139         u16 ht_opmode;
 140         bool enable_ht = true;
 141         enum nl80211_channel_type prev_chantype;
 142         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 143
 144         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 145
 146         prev_chantype = sdata->vif.bss_conf.channel_type;
 147
 148         /* HT is not supported */
 149         if (!sband->ht_cap.ht_supported)
 150                 enable_ht = false;
 151
 152         /* check that channel matches the right operating channel */
 153         if (local->hw.conf.channel->center_freq !=
 154             ieee80211_channel_to_frequency(hti->control_chan))
 155                 enable_ht = false;
 156
 157         if (enable_ht) {
 158                 channel_type = NL80211_CHAN_HT20;
 159
 160                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 161                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 162                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 163                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 164                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 165                                 if (!(local->hw.conf.channel->flags &
 166                                     IEEE80211_CHAN_NO_HT40PLUS))
 167                                         channel_type = NL80211_CHAN_HT40PLUS;
 168                                 break;
 169                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 170                                 if (!(local->hw.conf.channel->flags &
 171                                     IEEE80211_CHAN_NO_HT40MINUS))
 172                                         channel_type = NL80211_CHAN_HT40MINUS;
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         if (local->tmp_channel)
 179                 local->tmp_channel_type = channel_type;
 180
 181         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 182                 /* can only fail due to HT40+/- mismatch */
 183                 channel_type = NL80211_CHAN_HT20;
 184                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 185         }
 186
 187         /* channel_type change automatically detected */
 188         ieee80211_hw_config(local, 0);
 189
 190         if (prev_chantype != channel_type) {
 191                 rcu_read_lock();
 192                 sta = sta_info_get(sdata, bssid);
 193                 if (sta)
 194                         rate_control_rate_update(local, sband, sta,
 195                                                  IEEE80211_RC_HT_CHANGED,
 196                                                  channel_type);
 197                 rcu_read_unlock();
 198         }
 199
 200         ht_opmode = le16_to_cpu(hti->operation_mode);
 201
 202         /* if bss configuration changed store the new one */
 203         if (sdata->ht_opmode_valid != enable_ht ||
 204             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 205             prev_chantype != channel_type) {
 206                 changed |= BSS_CHANGED_HT;
 207                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 208                 sdata->ht_opmode_valid = enable_ht;
 209         }
 210
 211         return changed;
 212 }
 213
 214 /* frame sending functions */
 215
 216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 217                                            const u8 *bssid, u16 stype, u16 reason,
 218                                            void *cookie, bool send_frame)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 222         struct sk_buff *skb;
 223         struct ieee80211_mgmt *mgmt;
 224
 225         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 226         if (!skb) {
 227                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 228                        "deauth/disassoc frame\n", sdata->name);
 229                 return;
 230         }
 231         skb_reserve(skb, local->hw.extra_tx_headroom);
 232
 233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 234         memset(mgmt, 0, 24);
 235         memcpy(mgmt->da, bssid, ETH_ALEN);
 236         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 237         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 238         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 239         skb_put(skb, 2);
 240         /* u.deauth.reason_code == u.disassoc.reason_code */
 241         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 242
 243         if (stype == IEEE80211_STYPE_DEAUTH)
 244                 if (cookie)
 245                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 246                 else
 247                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 248         else
 249                 if (cookie)
 250                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 251                 else
 252                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 253         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 254                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 255
 256         if (send_frame)
 257                 ieee80211_tx_skb(sdata, skb);
 258         else
 259                 kfree_skb(skb);
 260 }
 261
 262 void ieee80211_send_pspoll(struct ieee80211_local *local,
 263                            struct ieee80211_sub_if_data *sdata)
 264 {
 265         struct ieee80211_pspoll *pspoll;
 266         struct sk_buff *skb;
 267
 268         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 269         if (!skb)
 270                 return;
 271
 272         pspoll = (struct ieee80211_pspoll *) skb->data;
 273         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 274
 275         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 276         ieee80211_tx_skb(sdata, skb);
 277 }
 278
 279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 280                              struct ieee80211_sub_if_data *sdata,
 281                              int powersave)
 282 {
 283         struct sk_buff *skb;
 284         struct ieee80211_hdr_3addr *nullfunc;
 285
 286         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 287         if (!skb)
 288                 return;
 289
 290         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 291         if (powersave)
 292                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 293
 294         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 295         ieee80211_tx_skb(sdata, skb);
 296 }
 297
 298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 299                                           struct ieee80211_sub_if_data *sdata)
 300 {
 301         struct sk_buff *skb;
 302         struct ieee80211_hdr *nullfunc;
 303         __le16 fc;
 304
 305         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 306                 return;
 307
 308         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 309         if (!skb) {
 310                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 311                        "nullfunc frame\n", sdata->name);
 312                 return;
 313         }
 314         skb_reserve(skb, local->hw.extra_tx_headroom);
 315
 316         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 317         memset(nullfunc, 0, 30);
 318         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 319                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 320         nullfunc->frame_control = fc;
 321         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 322         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 323         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 324         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 325
 326         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 327         ieee80211_tx_skb(sdata, skb);
 328 }
 329
 330 /* spectrum management related things */
 331 static void ieee80211_chswitch_work(struct work_struct *work)
 332 {
 333         struct ieee80211_sub_if_data *sdata =
 334                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 336
 337         if (!ieee80211_sdata_running(sdata))
 338                 return;
 339
 340         mutex_lock(&ifmgd->mtx);
 341         if (!ifmgd->associated)
 342                 goto out;
 343
 344         sdata->local->oper_channel = sdata->local->csa_channel;
 345         if (!sdata->local->ops->channel_switch) {
 346                 /* call "hw_config" only if doing sw channel switch */
 347                 ieee80211_hw_config(sdata->local,
 348                         IEEE80211_CONF_CHANGE_CHANNEL);
 349         }
 350
 351         /* XXX: shouldn't really modify cfg80211-owned data! */
 352         ifmgd->associated->channel = sdata->local->oper_channel;
 353
 354         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 355                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 356  out:
 357         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 358         mutex_unlock(&ifmgd->mtx);
 359 }
 360
 361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 362 {
 363         struct ieee80211_sub_if_data *sdata;
 364         struct ieee80211_if_managed *ifmgd;
 365
 366         sdata = vif_to_sdata(vif);
 367         ifmgd = &sdata->u.mgd;
 368
 369         trace_api_chswitch_done(sdata, success);
 370         if (!success) {
 371                 /*
 372                  * If the channel switch was not successful, stay
 373                  * around on the old channel. We currently lack
 374                  * good handling of this situation, possibly we
 375                  * should just drop the association.
 376                  */
 377                 sdata->local->csa_channel = sdata->local->oper_channel;
 378         }
 379
 380         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 381 }
 382 EXPORT_SYMBOL(ieee80211_chswitch_done);
 383
 384 static void ieee80211_chswitch_timer(unsigned long data)
 385 {
 386         struct ieee80211_sub_if_data *sdata =
 387                 (struct ieee80211_sub_if_data *) data;
 388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 389
 390         if (sdata->local->quiescing) {
 391                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 392                 return;
 393         }
 394
 395         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 396 }
 397
 398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 399                                       struct ieee80211_channel_sw_ie *sw_elem,
 400                                       struct ieee80211_bss *bss,
 401                                       u64 timestamp)
 402 {
 403         struct cfg80211_bss *cbss =
 404                 container_of((void *)bss, struct cfg80211_bss, priv);
 405         struct ieee80211_channel *new_ch;
 406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 407         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 408
 409         ASSERT_MGD_MTX(ifmgd);
 410
 411         if (!ifmgd->associated)
 412                 return;
 413
 414         if (sdata->local->scanning)
 415                 return;
 416
 417         /* Disregard subsequent beacons if we are already running a timer
 418            processing a CSA */
 419
 420         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 421                 return;
 422
 423         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 424         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 425                 return;
 426
 427         sdata->local->csa_channel = new_ch;
 428
 429         if (sdata->local->ops->channel_switch) {
 430                 /* use driver's channel switch callback */
 431                 struct ieee80211_channel_switch ch_switch;
 432                 memset(&ch_switch, 0, sizeof(ch_switch));
 433                 ch_switch.timestamp = timestamp;
 434                 if (sw_elem->mode) {
 435                         ch_switch.block_tx = true;
 436                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 437                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 438                 }
 439                 ch_switch.channel = new_ch;
 440                 ch_switch.count = sw_elem->count;
 441                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 442                 drv_channel_switch(sdata->local, &ch_switch);
 443                 return;
 444         }
 445
 446         /* channel switch handled in software */
 447         if (sw_elem->count <= 1) {
 448                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 449         } else {
 450                 if (sw_elem->mode)
 451                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 452                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 453                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 454                 mod_timer(&ifmgd->chswitch_timer,
 455                           jiffies +
 456                           msecs_to_jiffies(sw_elem->count *
 457                                            cbss->beacon_interval));
 458         }
 459 }
 460
 461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 462                                         u16 capab_info, u8 *pwr_constr_elem,
 463                                         u8 pwr_constr_elem_len)
 464 {
 465         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 466
 467         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 468                 return;
 469
 470         /* Power constraint IE length should be 1 octet */
 471         if (pwr_constr_elem_len != 1)
 472                 return;
 473
 474         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 475             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 476                 sdata->local->power_constr_level = *pwr_constr_elem;
 477                 ieee80211_hw_config(sdata->local, 0);
 478         }
 479 }
 480
 481 /* powersave */
 482 static void ieee80211_enable_ps(struct ieee80211_local *local,
 483                                 struct ieee80211_sub_if_data *sdata)
 484 {
 485         struct ieee80211_conf *conf = &local->hw.conf;
 486
 487         /*
 488          * If we are scanning right now then the parameters will
 489          * take effect when scan finishes.
 490          */
 491         if (local->scanning)
 492                 return;
 493
 494         if (conf->dynamic_ps_timeout > 0 &&
 495             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 496                 mod_timer(&local->dynamic_ps_timer, jiffies +
 497                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 498         } else {
 499                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 500                         ieee80211_send_nullfunc(local, sdata, 1);
 501
 502                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 503                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 504                         return;
 505
 506                 conf->flags |= IEEE80211_CONF_PS;
 507                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 508         }
 509 }
 510
 511 static void ieee80211_change_ps(struct ieee80211_local *local)
 512 {
 513         struct ieee80211_conf *conf = &local->hw.conf;
 514
 515         if (local->ps_sdata) {
 516                 ieee80211_enable_ps(local, local->ps_sdata);
 517         } else if (conf->flags & IEEE80211_CONF_PS) {
 518                 conf->flags &= ~IEEE80211_CONF_PS;
 519                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 520                 del_timer_sync(&local->dynamic_ps_timer);
 521                 cancel_work_sync(&local->dynamic_ps_enable_work);
 522         }
 523 }
 524
 525 /* need to hold RTNL or interface lock */
 526 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 527 {
 528         struct ieee80211_sub_if_data *sdata, *found = NULL;
 529         int count = 0;
 530         int timeout;
 531
 532         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 533                 local->ps_sdata = NULL;
 534                 return;
 535         }
 536
 537         if (!list_empty(&local->work_list)) {
 538                 local->ps_sdata = NULL;
 539                 goto change;
 540         }
 541
 542         list_for_each_entry(sdata, &local->interfaces, list) {
 543                 if (!ieee80211_sdata_running(sdata))
 544                         continue;
 545                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 546                         continue;
 547                 found = sdata;
 548                 count++;
 549         }
 550
 551         if (count == 1 && found->u.mgd.powersave &&
 552             found->u.mgd.associated &&
 553             found->u.mgd.associated->beacon_ies &&
 554             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 555                                     IEEE80211_STA_CONNECTION_POLL))) {
 556                 s32 beaconint_us;
 557
 558                 if (latency < 0)
 559                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 560
 561                 beaconint_us = ieee80211_tu_to_usec(
 562                                         found->vif.bss_conf.beacon_int);
 563
 564                 timeout = local->hw.conf.dynamic_ps_forced_timeout;
 565                 if (timeout < 0) {
 566                         /*
 567                          * The 2 second value is there for compatibility until
 568                          * the PM_QOS_NETWORK_LATENCY is configured with real
 569                          * values.
 570                          */
 571                         if (latency == 2000000000)
 572                                 timeout = 100;
 573                         else if (latency <= 50000)
 574                                 timeout = 300;
 575                         else if (latency <= 100000)
 576                                 timeout = 100;
 577                         else if (latency <= 500000)
 578                                 timeout = 50;
 579                         else
 580                                 timeout = 0;
 581                 }
 582                 local->hw.conf.dynamic_ps_timeout = timeout;
 583
 584                 if (beaconint_us > latency) {
 585                         local->ps_sdata = NULL;
 586                 } else {
 587                         struct ieee80211_bss *bss;
 588                         int maxslp = 1;
 589                         u8 dtimper;
 590
 591                         bss = (void *)found->u.mgd.associated->priv;
 592                         dtimper = bss->dtim_period;
 593
 594                         /* If the TIM IE is invalid, pretend the value is 1 */
 595                         if (!dtimper)
 596                                 dtimper = 1;
 597                         else if (dtimper > 1)
 598                                 maxslp = min_t(int, dtimper,
 599                                                     latency / beaconint_us);
 600
 601                         local->hw.conf.max_sleep_period = maxslp;
 602                         local->hw.conf.ps_dtim_period = dtimper;
 603                         local->ps_sdata = found;
 604                 }
 605         } else {
 606                 local->ps_sdata = NULL;
 607         }
 608
 609  change:
 610         ieee80211_change_ps(local);
 611 }
 612
 613 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 614 {
 615         struct ieee80211_local *local =
 616                 container_of(work, struct ieee80211_local,
 617                              dynamic_ps_disable_work);
 618
 619         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 620                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 621                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 622         }
 623
 624         ieee80211_wake_queues_by_reason(&local->hw,
 625                                         IEEE80211_QUEUE_STOP_REASON_PS);
 626 }
 627
 628 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 629 {
 630         struct ieee80211_local *local =
 631                 container_of(work, struct ieee80211_local,
 632                              dynamic_ps_enable_work);
 633         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 634         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 635
 636         /* can only happen when PS was just disabled anyway */
 637         if (!sdata)
 638                 return;
 639
 640         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 641                 return;
 642
 643         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 644             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 645                 ieee80211_send_nullfunc(local, sdata, 1);
 646
 647         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 648               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 649             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 650                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 651                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 652                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 653         }
 654 }
 655
 656 void ieee80211_dynamic_ps_timer(unsigned long data)
 657 {
 658         struct ieee80211_local *local = (void *) data;
 659
 660         if (local->quiescing || local->suspended)
 661                 return;
 662
 663         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 664 }
 665
 666 /* MLME */
 667 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 668                                      struct ieee80211_if_managed *ifmgd,
 669                                      u8 *wmm_param, size_t wmm_param_len)
 670 {
 671         struct ieee80211_tx_queue_params params;
 672         size_t left;
 673         int count;
 674         u8 *pos, uapsd_queues = 0;
 675
 676         if (!local->ops->conf_tx)
 677                 return;
 678
 679         if (local->hw.queues < 4)
 680                 return;
 681
 682         if (!wmm_param)
 683                 return;
 684
 685         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 686                 return;
 687
 688         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 689                 uapsd_queues = local->uapsd_queues;
 690
 691         count = wmm_param[6] & 0x0f;
 692         if (count == ifmgd->wmm_last_param_set)
 693                 return;
 694         ifmgd->wmm_last_param_set = count;
 695
 696         pos = wmm_param + 8;
 697         left = wmm_param_len - 8;
 698
 699         memset(&params, 0, sizeof(params));
 700
 701         local->wmm_acm = 0;
 702         for (; left >= 4; left -= 4, pos += 4) {
 703                 int aci = (pos[0] >> 5) & 0x03;
 704                 int acm = (pos[0] >> 4) & 0x01;
 705                 bool uapsd = false;
 706                 int queue;
 707
 708                 switch (aci) {
 709                 case 1: /* AC_BK */
 710                         queue = 3;
 711                         if (acm)
 712                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 713                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 714                                 uapsd = true;
 715                         break;
 716                 case 2: /* AC_VI */
 717                         queue = 1;
 718                         if (acm)
 719                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 720                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 721                                 uapsd = true;
 722                         break;
 723                 case 3: /* AC_VO */
 724                         queue = 0;
 725                         if (acm)
 726                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 727                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 728                                 uapsd = true;
 729                         break;
 730                 case 0: /* AC_BE */
 731                 default:
 732                         queue = 2;
 733                         if (acm)
 734                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 735                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 736                                 uapsd = true;
 737                         break;
 738                 }
 739
 740                 params.aifs = pos[0] & 0x0f;
 741                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 742                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 743                 params.txop = get_unaligned_le16(pos + 2);
 744                 params.uapsd = uapsd;
 745
 746 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 747                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 748                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 749                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 750                        params.aifs, params.cw_min, params.cw_max, params.txop,
 751                        params.uapsd);
 752 #endif
 753                 if (drv_conf_tx(local, queue, &params))
 754                         printk(KERN_DEBUG "%s: failed to set TX queue "
 755                                "parameters for queue %d\n",
 756                                wiphy_name(local->hw.wiphy), queue);
 757         }
 758
 759         /* enable WMM or activate new settings */
 760         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 761         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 762 }
 763
 764 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 765                                            u16 capab, bool erp_valid, u8 erp)
 766 {
 767         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 768         u32 changed = 0;
 769         bool use_protection;
 770         bool use_short_preamble;
 771         bool use_short_slot;
 772
 773         if (erp_valid) {
 774                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 775                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 776         } else {
 777                 use_protection = false;
 778                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 779         }
 780
 781         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 782         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 783                 use_short_slot = true;
 784
 785         if (use_protection != bss_conf->use_cts_prot) {
 786                 bss_conf->use_cts_prot = use_protection;
 787                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 788         }
 789
 790         if (use_short_preamble != bss_conf->use_short_preamble) {
 791                 bss_conf->use_short_preamble = use_short_preamble;
 792                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 793         }
 794
 795         if (use_short_slot != bss_conf->use_short_slot) {
 796                 bss_conf->use_short_slot = use_short_slot;
 797                 changed |= BSS_CHANGED_ERP_SLOT;
 798         }
 799
 800         return changed;
 801 }
 802
 803 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 804                                      struct cfg80211_bss *cbss,
 805                                      u32 bss_info_changed)
 806 {
 807         struct ieee80211_bss *bss = (void *)cbss->priv;
 808         struct ieee80211_local *local = sdata->local;
 809
 810         bss_info_changed |= BSS_CHANGED_ASSOC;
 811         /* set timing information */
 812         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 813         sdata->vif.bss_conf.timestamp = cbss->tsf;
 814
 815         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 816         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 817                 cbss->capability, bss->has_erp_value, bss->erp_value);
 818
 819         sdata->u.mgd.associated = cbss;
 820         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 821
 822         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 823
 824         /* just to be sure */
 825         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 826                                 IEEE80211_STA_BEACON_POLL);
 827
 828         /*
 829          * Always handle WMM once after association regardless
 830          * of the first value the AP uses. Setting -1 here has
 831          * that effect because the AP values is an unsigned
 832          * 4-bit value.
 833          */
 834         sdata->u.mgd.wmm_last_param_set = -1;
 835
 836         ieee80211_led_assoc(local, 1);
 837
 838         sdata->vif.bss_conf.assoc = 1;
 839         /*
 840          * For now just always ask the driver to update the basic rateset
 841          * when we have associated, we aren't checking whether it actually
 842          * changed or not.
 843          */
 844         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 845
 846         /* And the BSSID changed - we're associated now */
 847         bss_info_changed |= BSS_CHANGED_BSSID;
 848
 849         /* Tell the driver to monitor connection quality (if supported) */
 850         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 851             sdata->vif.bss_conf.cqm_rssi_thold)
 852                 bss_info_changed |= BSS_CHANGED_CQM;
 853
 854         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 855
 856         mutex_lock(&local->iflist_mtx);
 857         ieee80211_recalc_ps(local, -1);
 858         ieee80211_recalc_smps(local, sdata);
 859         mutex_unlock(&local->iflist_mtx);
 860
 861         netif_tx_start_all_queues(sdata->dev);
 862         netif_carrier_on(sdata->dev);
 863 }
 864
 865 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 866                                    bool remove_sta)
 867 {
 868         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 869         struct ieee80211_local *local = sdata->local;
 870         struct sta_info *sta;
 871         u32 changed = 0, config_changed = 0;
 872         u8 bssid[ETH_ALEN];
 873
 874         ASSERT_MGD_MTX(ifmgd);
 875
 876         if (WARN_ON(!ifmgd->associated))
 877                 return;
 878
 879         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 880
 881         ifmgd->associated = NULL;
 882         memset(ifmgd->bssid, 0, ETH_ALEN);
 883
 884         /*
 885          * we need to commit the associated = NULL change because the
 886          * scan code uses that to determine whether this iface should
 887          * go to/wake up from powersave or not -- and could otherwise
 888          * wake the queues erroneously.
 889          */
 890         smp_mb();
 891
 892         /*
 893          * Thus, we can only afterwards stop the queues -- to account
 894          * for the case where another CPU is finishing a scan at this
 895          * time -- we don't want the scan code to enable queues.
 896          */
 897
 898         netif_tx_stop_all_queues(sdata->dev);
 899         netif_carrier_off(sdata->dev);
 900
 901         mutex_lock(&local->sta_mtx);
 902         sta = sta_info_get(sdata, bssid);
 903         if (sta) {
 904                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 905                 ieee80211_sta_tear_down_BA_sessions(sta);
 906         }
 907         mutex_unlock(&local->sta_mtx);
 908
 909         changed |= ieee80211_reset_erp_info(sdata);
 910
 911         ieee80211_led_assoc(local, 0);
 912         changed |= BSS_CHANGED_ASSOC;
 913         sdata->vif.bss_conf.assoc = false;
 914
 915         ieee80211_set_wmm_default(sdata);
 916
 917         /* channel(_type) changes are handled by ieee80211_hw_config */
 918         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 919
 920         /* on the next assoc, re-program HT parameters */
 921         sdata->ht_opmode_valid = false;
 922
 923         local->power_constr_level = 0;
 924
 925         del_timer_sync(&local->dynamic_ps_timer);
 926         cancel_work_sync(&local->dynamic_ps_enable_work);
 927
 928         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 929                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 930                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 931         }
 932
 933         ieee80211_hw_config(local, config_changed);
 934
 935         /* The BSSID (not really interesting) and HT changed */
 936         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
 937         ieee80211_bss_info_change_notify(sdata, changed);
 938
 939         if (remove_sta)
 940                 sta_info_destroy_addr(sdata, bssid);
 941 }
 942
 943 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 944                              struct ieee80211_hdr *hdr)
 945 {
 946         /*
 947          * We can postpone the mgd.timer whenever receiving unicast frames
 948          * from AP because we know that the connection is working both ways
 949          * at that time. But multicast frames (and hence also beacons) must
 950          * be ignored here, because we need to trigger the timer during
 951          * data idle periods for sending the periodic probe request to the
 952          * AP we're connected to.
 953          */
 954         if (is_multicast_ether_addr(hdr->addr1))
 955                 return;
 956
 957         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 958                 return;
 959
 960         mod_timer(&sdata->u.mgd.conn_mon_timer,
 961                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 962 }
 963
 964 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 965 {
 966         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 967         const u8 *ssid;
 968
 969         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 970         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 971                                  ssid + 2, ssid[1], NULL, 0);
 972
 973         ifmgd->probe_send_count++;
 974         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 975         run_again(ifmgd, ifmgd->probe_timeout);
 976 }
 977
 978 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 979                                    bool beacon)
 980 {
 981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 982         bool already = false;
 983
 984         if (!ieee80211_sdata_running(sdata))
 985                 return;
 986
 987         if (sdata->local->scanning)
 988                 return;
 989
 990         if (sdata->local->tmp_channel)
 991                 return;
 992
 993         mutex_lock(&ifmgd->mtx);
 994
 995         if (!ifmgd->associated)
 996                 goto out;
 997
 998 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 999         if (beacon && net_ratelimit())
1000                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1001                        "- sending probe request\n", sdata->name);
1002 #endif
1003
1004         /*
1005          * The driver/our work has already reported this event or the
1006          * connection monitoring has kicked in and we have already sent
1007          * a probe request. Or maybe the AP died and the driver keeps
1008          * reporting until we disassociate...
1009          *
1010          * In either case we have to ignore the current call to this
1011          * function (except for setting the correct probe reason bit)
1012          * because otherwise we would reset the timer every time and
1013          * never check whether we received a probe response!
1014          */
1015         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1016                             IEEE80211_STA_CONNECTION_POLL))
1017                 already = true;
1018
1019         if (beacon)
1020                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1021         else
1022                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1023
1024         if (already)
1025                 goto out;
1026
1027         mutex_lock(&sdata->local->iflist_mtx);
1028         ieee80211_recalc_ps(sdata->local, -1);
1029         mutex_unlock(&sdata->local->iflist_mtx);
1030
1031         ifmgd->probe_send_count = 0;
1032         ieee80211_mgd_probe_ap_send(sdata);
1033  out:
1034         mutex_unlock(&ifmgd->mtx);
1035 }
1036
1037 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1038 {
1039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040         struct ieee80211_local *local = sdata->local;
1041         u8 bssid[ETH_ALEN];
1042
1043         mutex_lock(&ifmgd->mtx);
1044         if (!ifmgd->associated) {
1045                 mutex_unlock(&ifmgd->mtx);
1046                 return;
1047         }
1048
1049         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1050
1051         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1052
1053         ieee80211_set_disassoc(sdata, true);
1054         ieee80211_recalc_idle(local);
1055         mutex_unlock(&ifmgd->mtx);
1056         /*
1057          * must be outside lock due to cfg80211,
1058          * but that's not a problem.
1059          */
1060         ieee80211_send_deauth_disassoc(sdata, bssid,
1061                                        IEEE80211_STYPE_DEAUTH,
1062                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1063                                        NULL, true);
1064 }
1065
1066 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1067 {
1068         struct ieee80211_sub_if_data *sdata =
1069                 container_of(work, struct ieee80211_sub_if_data,
1070                              u.mgd.beacon_connection_loss_work);
1071
1072         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1073                 __ieee80211_connection_loss(sdata);
1074         else
1075                 ieee80211_mgd_probe_ap(sdata, true);
1076 }
1077
1078 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1079 {
1080         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1081         struct ieee80211_hw *hw = &sdata->local->hw;
1082
1083         trace_api_beacon_loss(sdata);
1084
1085         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1086         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1087 }
1088 EXPORT_SYMBOL(ieee80211_beacon_loss);
1089
1090 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1091 {
1092         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1093         struct ieee80211_hw *hw = &sdata->local->hw;
1094
1095         trace_api_connection_loss(sdata);
1096
1097         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1098         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1099 }
1100 EXPORT_SYMBOL(ieee80211_connection_loss);
1101
1102
1103 static enum rx_mgmt_action __must_check
1104 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1105                          struct ieee80211_mgmt *mgmt, size_t len)
1106 {
1107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108         const u8 *bssid = NULL;
1109         u16 reason_code;
1110
1111         if (len < 24 + 2)
1112                 return RX_MGMT_NONE;
1113
1114         ASSERT_MGD_MTX(ifmgd);
1115
1116         bssid = ifmgd->associated->bssid;
1117
1118         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1119
1120         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1121                         sdata->name, bssid, reason_code);
1122
1123         ieee80211_set_disassoc(sdata, true);
1124         ieee80211_recalc_idle(sdata->local);
1125
1126         return RX_MGMT_CFG80211_DEAUTH;
1127 }
1128
1129
1130 static enum rx_mgmt_action __must_check
1131 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1132                            struct ieee80211_mgmt *mgmt, size_t len)
1133 {
1134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1135         u16 reason_code;
1136
1137         if (len < 24 + 2)
1138                 return RX_MGMT_NONE;
1139
1140         ASSERT_MGD_MTX(ifmgd);
1141
1142         if (WARN_ON(!ifmgd->associated))
1143                 return RX_MGMT_NONE;
1144
1145         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1146                 return RX_MGMT_NONE;
1147
1148         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1149
1150         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1151                         sdata->name, mgmt->sa, reason_code);
1152
1153         ieee80211_set_disassoc(sdata, true);
1154         ieee80211_recalc_idle(sdata->local);
1155         return RX_MGMT_CFG80211_DISASSOC;
1156 }
1157
1158
1159 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1160                                     struct ieee80211_mgmt *mgmt, size_t len)
1161 {
1162         struct ieee80211_sub_if_data *sdata = wk->sdata;
1163         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1164         struct ieee80211_local *local = sdata->local;
1165         struct ieee80211_supported_band *sband;
1166         struct sta_info *sta;
1167         struct cfg80211_bss *cbss = wk->assoc.bss;
1168         u8 *pos;
1169         u32 rates, basic_rates;
1170         u16 capab_info, aid;
1171         struct ieee802_11_elems elems;
1172         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1173         u32 changed = 0;
1174         int i, j, err;
1175         bool have_higher_than_11mbit = false;
1176         u16 ap_ht_cap_flags;
1177
1178         /* AssocResp and ReassocResp have identical structure */
1179
1180         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1181         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1182
1183         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1184                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1185                        "set\n", sdata->name, aid);
1186         aid &= ~(BIT(15) | BIT(14));
1187
1188         pos = mgmt->u.assoc_resp.variable;
1189         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1190
1191         if (!elems.supp_rates) {
1192                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1193                        sdata->name);
1194                 return false;
1195         }
1196
1197         ifmgd->aid = aid;
1198
1199         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1200         if (!sta) {
1201                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1202                        " the AP\n", sdata->name);
1203                 return false;
1204         }
1205
1206         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1207                            WLAN_STA_ASSOC_AP);
1208         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1209                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1210
1211         rates = 0;
1212         basic_rates = 0;
1213         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1214
1215         for (i = 0; i < elems.supp_rates_len; i++) {
1216                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1217                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1218
1219                 if (rate > 110)
1220                         have_higher_than_11mbit = true;
1221
1222                 for (j = 0; j < sband->n_bitrates; j++) {
1223                         if (sband->bitrates[j].bitrate == rate) {
1224                                 rates |= BIT(j);
1225                                 if (is_basic)
1226                                         basic_rates |= BIT(j);
1227                                 break;
1228                         }
1229                 }
1230         }
1231
1232         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1233                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1234                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1235
1236                 if (rate > 110)
1237                         have_higher_than_11mbit = true;
1238
1239                 for (j = 0; j < sband->n_bitrates; j++) {
1240                         if (sband->bitrates[j].bitrate == rate) {
1241                                 rates |= BIT(j);
1242                                 if (is_basic)
1243                                         basic_rates |= BIT(j);
1244                                 break;
1245                         }
1246                 }
1247         }
1248
1249         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1250         sdata->vif.bss_conf.basic_rates = basic_rates;
1251
1252         /* cf. IEEE 802.11 9.2.12 */
1253         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1254             have_higher_than_11mbit)
1255                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1256         else
1257                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1258
1259         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1260                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1261                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1262
1263         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1264
1265         rate_control_rate_init(sta);
1266
1267         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1268                 set_sta_flags(sta, WLAN_STA_MFP);
1269
1270         if (elems.wmm_param)
1271                 set_sta_flags(sta, WLAN_STA_WME);
1272
1273         err = sta_info_insert(sta);
1274         sta = NULL;
1275         if (err) {
1276                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1277                        " the AP (error %d)\n", sdata->name, err);
1278                 return false;
1279         }
1280
1281         if (elems.wmm_param)
1282                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1283                                          elems.wmm_param_len);
1284         else
1285                 ieee80211_set_wmm_default(sdata);
1286
1287         local->oper_channel = wk->chan;
1288
1289         if (elems.ht_info_elem && elems.wmm_param &&
1290             (sdata->local->hw.queues >= 4) &&
1291             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1292                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1293                                                cbss->bssid, ap_ht_cap_flags);
1294
1295         /* set AID and assoc capability,
1296          * ieee80211_set_associated() will tell the driver */
1297         bss_conf->aid = aid;
1298         bss_conf->assoc_capability = capab_info;
1299         ieee80211_set_associated(sdata, cbss, changed);
1300
1301         /*
1302          * If we're using 4-addr mode, let the AP know that we're
1303          * doing so, so that it can create the STA VLAN on its side
1304          */
1305         if (ifmgd->use_4addr)
1306                 ieee80211_send_4addr_nullfunc(local, sdata);
1307
1308         /*
1309          * Start timer to probe the connection to the AP now.
1310          * Also start the timer that will detect beacon loss.
1311          */
1312         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1313         mod_beacon_timer(sdata);
1314
1315         return true;
1316 }
1317
1318
1319 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1320                                   struct ieee80211_mgmt *mgmt,
1321                                   size_t len,
1322                                   struct ieee80211_rx_status *rx_status,
1323                                   struct ieee802_11_elems *elems,
1324                                   bool beacon)
1325 {
1326         struct ieee80211_local *local = sdata->local;
1327         int freq;
1328         struct ieee80211_bss *bss;
1329         struct ieee80211_channel *channel;
1330         bool need_ps = false;
1331
1332         if (sdata->u.mgd.associated) {
1333                 bss = (void *)sdata->u.mgd.associated->priv;
1334                 /* not previously set so we may need to recalc */
1335                 need_ps = !bss->dtim_period;
1336         }
1337
1338         if (elems->ds_params && elems->ds_params_len == 1)
1339                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1340         else
1341                 freq = rx_status->freq;
1342
1343         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1344
1345         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1346                 return;
1347
1348         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1349                                         channel, beacon);
1350         if (bss)
1351                 ieee80211_rx_bss_put(local, bss);
1352
1353         if (!sdata->u.mgd.associated)
1354                 return;
1355
1356         if (need_ps) {
1357                 mutex_lock(&local->iflist_mtx);
1358                 ieee80211_recalc_ps(local, -1);
1359                 mutex_unlock(&local->iflist_mtx);
1360         }
1361
1362         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1363             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1364                                                         ETH_ALEN) == 0)) {
1365                 struct ieee80211_channel_sw_ie *sw_elem =
1366                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1367                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1368                                                  bss, rx_status->mactime);
1369         }
1370 }
1371
1372
1373 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1374                                          struct sk_buff *skb)
1375 {
1376         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1377         struct ieee80211_if_managed *ifmgd;
1378         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1379         size_t baselen, len = skb->len;
1380         struct ieee802_11_elems elems;
1381
1382         ifmgd = &sdata->u.mgd;
1383
1384         ASSERT_MGD_MTX(ifmgd);
1385
1386         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1387                 return; /* ignore ProbeResp to foreign address */
1388
1389         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1390         if (baselen > len)
1391                 return;
1392
1393         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1394                                 &elems);
1395
1396         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1397
1398         if (ifmgd->associated &&
1399             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1400             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1401                             IEEE80211_STA_CONNECTION_POLL)) {
1402                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1403                                   IEEE80211_STA_BEACON_POLL);
1404                 mutex_lock(&sdata->local->iflist_mtx);
1405                 ieee80211_recalc_ps(sdata->local, -1);
1406                 mutex_unlock(&sdata->local->iflist_mtx);
1407
1408                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1409                         return;
1410
1411                 /*
1412                  * We've received a probe response, but are not sure whether
1413                  * we have or will be receiving any beacons or data, so let's
1414                  * schedule the timers again, just in case.
1415                  */
1416                 mod_beacon_timer(sdata);
1417
1418                 mod_timer(&ifmgd->conn_mon_timer,
1419                           round_jiffies_up(jiffies +
1420                                            IEEE80211_CONNECTION_IDLE_TIME));
1421         }
1422 }
1423
1424 /*
1425  * This is the canonical list of information elements we care about,
1426  * the filter code also gives us all changes to the Microsoft OUI
1427  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1428  *
1429  * We implement beacon filtering in software since that means we can
1430  * avoid processing the frame here and in cfg80211, and userspace
1431  * will not be able to tell whether the hardware supports it or not.
1432  *
1433  * XXX: This list needs to be dynamic -- userspace needs to be able to
1434  *      add items it requires. It also needs to be able to tell us to
1435  *      look out for other vendor IEs.
1436  */
1437 static const u64 care_about_ies =
1438         (1ULL << WLAN_EID_COUNTRY) |
1439         (1ULL << WLAN_EID_ERP_INFO) |
1440         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1441         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1442         (1ULL << WLAN_EID_HT_CAPABILITY) |
1443         (1ULL << WLAN_EID_HT_INFORMATION);
1444
1445 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1446                                      struct ieee80211_mgmt *mgmt,
1447                                      size_t len,
1448                                      struct ieee80211_rx_status *rx_status)
1449 {
1450         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1451         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1452         size_t baselen;
1453         struct ieee802_11_elems elems;
1454         struct ieee80211_local *local = sdata->local;
1455         u32 changed = 0;
1456         bool erp_valid, directed_tim = false;
1457         u8 erp_value = 0;
1458         u32 ncrc;
1459         u8 *bssid;
1460
1461         ASSERT_MGD_MTX(ifmgd);
1462
1463         /* Process beacon from the current BSS */
1464         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1465         if (baselen > len)
1466                 return;
1467
1468         if (rx_status->freq != local->hw.conf.channel->center_freq)
1469                 return;
1470
1471         /*
1472          * We might have received a number of frames, among them a
1473          * disassoc frame and a beacon...
1474          */
1475         if (!ifmgd->associated)
1476                 return;
1477
1478         bssid = ifmgd->associated->bssid;
1479
1480         /*
1481          * And in theory even frames from a different AP we were just
1482          * associated to a split-second ago!
1483          */
1484         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1485                 return;
1486
1487         /* Track average RSSI from the Beacon frames of the current AP */
1488         ifmgd->last_beacon_signal = rx_status->signal;
1489         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1490                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1491                 ifmgd->ave_beacon_signal = rx_status->signal;
1492                 ifmgd->last_cqm_event_signal = 0;
1493         } else {
1494                 ifmgd->ave_beacon_signal =
1495                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1496                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1497                          ifmgd->ave_beacon_signal) / 16;
1498         }
1499         if (bss_conf->cqm_rssi_thold &&
1500             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1501                 int sig = ifmgd->ave_beacon_signal / 16;
1502                 int last_event = ifmgd->last_cqm_event_signal;
1503                 int thold = bss_conf->cqm_rssi_thold;
1504                 int hyst = bss_conf->cqm_rssi_hyst;
1505                 if (sig < thold &&
1506                     (last_event == 0 || sig < last_event - hyst)) {
1507                         ifmgd->last_cqm_event_signal = sig;
1508                         ieee80211_cqm_rssi_notify(
1509                                 &sdata->vif,
1510                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1511                                 GFP_KERNEL);
1512                 } else if (sig > thold &&
1513                            (last_event == 0 || sig > last_event + hyst)) {
1514                         ifmgd->last_cqm_event_signal = sig;
1515                         ieee80211_cqm_rssi_notify(
1516                                 &sdata->vif,
1517                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1518                                 GFP_KERNEL);
1519                 }
1520         }
1521
1522         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1523 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1524                 if (net_ratelimit()) {
1525                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1526                                "to a received beacon\n", sdata->name);
1527                 }
1528 #endif
1529                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1530                 mutex_lock(&local->iflist_mtx);
1531                 ieee80211_recalc_ps(local, -1);
1532                 mutex_unlock(&local->iflist_mtx);
1533         }
1534
1535         /*
1536          * Push the beacon loss detection into the future since
1537          * we are processing a beacon from the AP just now.
1538          */
1539         mod_beacon_timer(sdata);
1540
1541         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1542         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1543                                           len - baselen, &elems,
1544                                           care_about_ies, ncrc);
1545
1546         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1547                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1548                                                    ifmgd->aid);
1549
1550         if (ncrc != ifmgd->beacon_crc) {
1551                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1552                                       true);
1553
1554                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1555                                          elems.wmm_param_len);
1556         }
1557
1558         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1559                 if (directed_tim) {
1560                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1561                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1562                                 ieee80211_hw_config(local,
1563                                                     IEEE80211_CONF_CHANGE_PS);
1564                                 ieee80211_send_nullfunc(local, sdata, 0);
1565                         } else {
1566                                 local->pspolling = true;
1567
1568                                 /*
1569                                  * Here is assumed that the driver will be
1570                                  * able to send ps-poll frame and receive a
1571                                  * response even though power save mode is
1572                                  * enabled, but some drivers might require
1573                                  * to disable power save here. This needs
1574                                  * to be investigated.
1575                                  */
1576                                 ieee80211_send_pspoll(local, sdata);
1577                         }
1578                 }
1579         }
1580
1581         if (ncrc == ifmgd->beacon_crc)
1582                 return;
1583         ifmgd->beacon_crc = ncrc;
1584
1585         if (elems.erp_info && elems.erp_info_len >= 1) {
1586                 erp_valid = true;
1587                 erp_value = elems.erp_info[0];
1588         } else {
1589                 erp_valid = false;
1590         }
1591         changed |= ieee80211_handle_bss_capability(sdata,
1592                         le16_to_cpu(mgmt->u.beacon.capab_info),
1593                         erp_valid, erp_value);
1594
1595
1596         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1597             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1598                 struct sta_info *sta;
1599                 struct ieee80211_supported_band *sband;
1600                 u16 ap_ht_cap_flags;
1601
1602                 rcu_read_lock();
1603
1604                 sta = sta_info_get(sdata, bssid);
1605                 if (WARN_ON(!sta)) {
1606                         rcu_read_unlock();
1607                         return;
1608                 }
1609
1610                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1611
1612                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1613                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1614
1615                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1616
1617                 rcu_read_unlock();
1618
1619                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1620                                                bssid, ap_ht_cap_flags);
1621         }
1622
1623         /* Note: country IE parsing is done for us by cfg80211 */
1624         if (elems.country_elem) {
1625                 /* TODO: IBSS also needs this */
1626                 if (elems.pwr_constr_elem)
1627                         ieee80211_handle_pwr_constr(sdata,
1628                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1629                                 elems.pwr_constr_elem,
1630                                 elems.pwr_constr_elem_len);
1631         }
1632
1633         ieee80211_bss_info_change_notify(sdata, changed);
1634 }
1635
1636 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1637                                   struct sk_buff *skb)
1638 {
1639         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1640         struct ieee80211_rx_status *rx_status;
1641         struct ieee80211_mgmt *mgmt;
1642         enum rx_mgmt_action rma = RX_MGMT_NONE;
1643         u16 fc;
1644
1645         rx_status = (struct ieee80211_rx_status *) skb->cb;
1646         mgmt = (struct ieee80211_mgmt *) skb->data;
1647         fc = le16_to_cpu(mgmt->frame_control);
1648
1649         mutex_lock(&ifmgd->mtx);
1650
1651         if (ifmgd->associated &&
1652             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1653                 switch (fc & IEEE80211_FCTL_STYPE) {
1654                 case IEEE80211_STYPE_BEACON:
1655                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1656                                                  rx_status);
1657                         break;
1658                 case IEEE80211_STYPE_PROBE_RESP:
1659                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1660                         break;
1661                 case IEEE80211_STYPE_DEAUTH:
1662                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1663                         break;
1664                 case IEEE80211_STYPE_DISASSOC:
1665                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1666                         break;
1667                 case IEEE80211_STYPE_ACTION:
1668                         switch (mgmt->u.action.category) {
1669                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1670                                 ieee80211_sta_process_chanswitch(sdata,
1671                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1672                                                 (void *)ifmgd->associated->priv,
1673                                                 rx_status->mactime);
1674                                 break;
1675                         }
1676                 }
1677                 mutex_unlock(&ifmgd->mtx);
1678
1679                 switch (rma) {
1680                 case RX_MGMT_NONE:
1681                         /* no action */
1682                         break;
1683                 case RX_MGMT_CFG80211_DEAUTH:
1684                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1685                         break;
1686                 case RX_MGMT_CFG80211_DISASSOC:
1687                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1688                         break;
1689                 default:
1690                         WARN(1, "unexpected: %d", rma);
1691                 }
1692                 return;
1693         }
1694
1695         mutex_unlock(&ifmgd->mtx);
1696
1697         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1698             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1699                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1700 }
1701
1702 static void ieee80211_sta_timer(unsigned long data)
1703 {
1704         struct ieee80211_sub_if_data *sdata =
1705                 (struct ieee80211_sub_if_data *) data;
1706         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1707         struct ieee80211_local *local = sdata->local;
1708
1709         if (local->quiescing) {
1710                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1711                 return;
1712         }
1713
1714         ieee80211_queue_work(&local->hw, &sdata->work);
1715 }
1716
1717 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1718 {
1719         struct ieee80211_local *local = sdata->local;
1720         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1721
1722         /* then process the rest of the work */
1723         mutex_lock(&ifmgd->mtx);
1724
1725         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1726                             IEEE80211_STA_CONNECTION_POLL) &&
1727             ifmgd->associated) {
1728                 u8 bssid[ETH_ALEN];
1729
1730                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1731                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1732                         run_again(ifmgd, ifmgd->probe_timeout);
1733
1734                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1735 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1736                         printk(KERN_DEBUG "No probe response from AP %pM"
1737                                 " after %dms, try %d\n", bssid,
1738                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1739                                 ifmgd->probe_send_count);
1740 #endif
1741                         ieee80211_mgd_probe_ap_send(sdata);
1742                 } else {
1743                         /*
1744                          * We actually lost the connection ... or did we?
1745                          * Let's make sure!
1746                          */
1747                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1748                                           IEEE80211_STA_BEACON_POLL);
1749                         printk(KERN_DEBUG "No probe response from AP %pM"
1750                                 " after %dms, disconnecting.\n",
1751                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1752                         ieee80211_set_disassoc(sdata, true);
1753                         ieee80211_recalc_idle(local);
1754                         mutex_unlock(&ifmgd->mtx);
1755                         /*
1756                          * must be outside lock due to cfg80211,
1757                          * but that's not a problem.
1758                          */
1759                         ieee80211_send_deauth_disassoc(sdata, bssid,
1760                                         IEEE80211_STYPE_DEAUTH,
1761                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1762                                         NULL, true);
1763                         mutex_lock(&ifmgd->mtx);
1764                 }
1765         }
1766
1767         mutex_unlock(&ifmgd->mtx);
1768 }
1769
1770 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1771 {
1772         struct ieee80211_sub_if_data *sdata =
1773                 (struct ieee80211_sub_if_data *) data;
1774         struct ieee80211_local *local = sdata->local;
1775
1776         if (local->quiescing)
1777                 return;
1778
1779         ieee80211_queue_work(&sdata->local->hw,
1780                              &sdata->u.mgd.beacon_connection_loss_work);
1781 }
1782
1783 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1784 {
1785         struct ieee80211_sub_if_data *sdata =
1786                 (struct ieee80211_sub_if_data *) data;
1787         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1788         struct ieee80211_local *local = sdata->local;
1789
1790         if (local->quiescing)
1791                 return;
1792
1793         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1794 }
1795
1796 static void ieee80211_sta_monitor_work(struct work_struct *work)
1797 {
1798         struct ieee80211_sub_if_data *sdata =
1799                 container_of(work, struct ieee80211_sub_if_data,
1800                              u.mgd.monitor_work);
1801
1802         ieee80211_mgd_probe_ap(sdata, false);
1803 }
1804
1805 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1806 {
1807         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1808                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1809                                         IEEE80211_STA_CONNECTION_POLL);
1810
1811                 /* let's probe the connection once */
1812                 ieee80211_queue_work(&sdata->local->hw,
1813                            &sdata->u.mgd.monitor_work);
1814                 /* and do all the other regular work too */
1815                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1816         }
1817 }
1818
1819 #ifdef CONFIG_PM
1820 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1821 {
1822         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1823
1824         /*
1825          * we need to use atomic bitops for the running bits
1826          * only because both timers might fire at the same
1827          * time -- the code here is properly synchronised.
1828          */
1829
1830         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1831         if (del_timer_sync(&ifmgd->timer))
1832                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1833
1834         cancel_work_sync(&ifmgd->chswitch_work);
1835         if (del_timer_sync(&ifmgd->chswitch_timer))
1836                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1837
1838         cancel_work_sync(&ifmgd->monitor_work);
1839         /* these will just be re-established on connection */
1840         del_timer_sync(&ifmgd->conn_mon_timer);
1841         del_timer_sync(&ifmgd->bcn_mon_timer);
1842 }
1843
1844 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1845 {
1846         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1847
1848         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1849                 add_timer(&ifmgd->timer);
1850         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1851                 add_timer(&ifmgd->chswitch_timer);
1852 }
1853 #endif
1854
1855 /* interface setup */
1856 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1857 {
1858         struct ieee80211_if_managed *ifmgd;
1859
1860         ifmgd = &sdata->u.mgd;
1861         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1862         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1863         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1864                   ieee80211_beacon_connection_loss_work);
1865         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1866                     (unsigned long) sdata);
1867         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1868                     (unsigned long) sdata);
1869         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1870                     (unsigned long) sdata);
1871         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1872                     (unsigned long) sdata);
1873
1874         ifmgd->flags = 0;
1875
1876         mutex_init(&ifmgd->mtx);
1877
1878         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1879                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1880         else
1881                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1882 }
1883
1884 /* scan finished notification */
1885 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1886 {
1887         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1888
1889         /* Restart STA timers */
1890         rcu_read_lock();
1891         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1892                 ieee80211_restart_sta_timer(sdata);
1893         rcu_read_unlock();
1894 }
1895
1896 int ieee80211_max_network_latency(struct notifier_block *nb,
1897                                   unsigned long data, void *dummy)
1898 {
1899         s32 latency_usec = (s32) data;
1900         struct ieee80211_local *local =
1901                 container_of(nb, struct ieee80211_local,
1902                              network_latency_notifier);
1903
1904         mutex_lock(&local->iflist_mtx);
1905         ieee80211_recalc_ps(local, latency_usec);
1906         mutex_unlock(&local->iflist_mtx);
1907
1908         return 0;
1909 }
1910
1911 /* config hooks */
1912 static enum work_done_result
1913 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1914                           struct sk_buff *skb)
1915 {
1916         if (!skb) {
1917                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1918                 return WORK_DONE_DESTROY;
1919         }
1920
1921         if (wk->type == IEEE80211_WORK_AUTH) {
1922                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1923                 return WORK_DONE_DESTROY;
1924         }
1925
1926         mutex_lock(&wk->sdata->u.mgd.mtx);
1927         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1928         mutex_unlock(&wk->sdata->u.mgd.mtx);
1929
1930         wk->type = IEEE80211_WORK_AUTH;
1931         wk->probe_auth.tries = 0;
1932         return WORK_DONE_REQUEUE;
1933 }
1934
1935 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1936                        struct cfg80211_auth_request *req)
1937 {
1938         const u8 *ssid;
1939         struct ieee80211_work *wk;
1940         u16 auth_alg;
1941
1942         if (req->local_state_change)
1943                 return 0; /* no need to update mac80211 state */
1944
1945         switch (req->auth_type) {
1946         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1947                 auth_alg = WLAN_AUTH_OPEN;
1948                 break;
1949         case NL80211_AUTHTYPE_SHARED_KEY:
1950                 auth_alg = WLAN_AUTH_SHARED_KEY;
1951                 break;
1952         case NL80211_AUTHTYPE_FT:
1953                 auth_alg = WLAN_AUTH_FT;
1954                 break;
1955         case NL80211_AUTHTYPE_NETWORK_EAP:
1956                 auth_alg = WLAN_AUTH_LEAP;
1957                 break;
1958         default:
1959                 return -EOPNOTSUPP;
1960         }
1961
1962         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1963         if (!wk)
1964                 return -ENOMEM;
1965
1966         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1967
1968         if (req->ie && req->ie_len) {
1969                 memcpy(wk->ie, req->ie, req->ie_len);
1970                 wk->ie_len = req->ie_len;
1971         }
1972
1973         if (req->key && req->key_len) {
1974                 wk->probe_auth.key_len = req->key_len;
1975                 wk->probe_auth.key_idx = req->key_idx;
1976                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1977         }
1978
1979         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1980         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1981         wk->probe_auth.ssid_len = ssid[1];
1982
1983         wk->probe_auth.algorithm = auth_alg;
1984         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1985
1986         /* if we already have a probe, don't probe again */
1987         if (req->bss->proberesp_ies)
1988                 wk->type = IEEE80211_WORK_AUTH;
1989         else
1990                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1991         wk->chan = req->bss->channel;
1992         wk->sdata = sdata;
1993         wk->done = ieee80211_probe_auth_done;
1994
1995         ieee80211_add_work(wk);
1996         return 0;
1997 }
1998
1999 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2000                                                   struct sk_buff *skb)
2001 {
2002         struct ieee80211_mgmt *mgmt;
2003         u16 status;
2004
2005         if (!skb) {
2006                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2007                 return WORK_DONE_DESTROY;
2008         }
2009
2010         mgmt = (void *)skb->data;
2011         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2012
2013         if (status == WLAN_STATUS_SUCCESS) {
2014                 mutex_lock(&wk->sdata->u.mgd.mtx);
2015                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2016                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2017                         /* oops -- internal error -- send timeout for now */
2018                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2019                                                     wk->filter_ta);
2020                         return WORK_DONE_DESTROY;
2021                 } else {
2022                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2023 #ifdef CONFIG_INET
2024                         /*
2025                          * configure ARP filter IP addresses to the driver,
2026                          * intentionally outside the mgd mutex.
2027                          */
2028                         rtnl_lock();
2029                         ieee80211_set_arp_filter(wk->sdata);
2030                         rtnl_unlock();
2031 #endif
2032                 }
2033         }
2034
2035         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2036         return WORK_DONE_DESTROY;
2037 }
2038
2039 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2040                         struct cfg80211_assoc_request *req)
2041 {
2042         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2043         struct ieee80211_bss *bss = (void *)req->bss->priv;
2044         struct ieee80211_work *wk;
2045         const u8 *ssid;
2046         int i;
2047
2048         mutex_lock(&ifmgd->mtx);
2049         if (ifmgd->associated) {
2050                 if (!req->prev_bssid ||
2051                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2052                            ETH_ALEN)) {
2053                         /*
2054                          * We are already associated and the request was not a
2055                          * reassociation request from the current BSS, so
2056                          * reject it.
2057                          */
2058                         mutex_unlock(&ifmgd->mtx);
2059                         return -EALREADY;
2060                 }
2061
2062                 /* Trying to reassociate - clear previous association state */
2063                 ieee80211_set_disassoc(sdata, true);
2064         }
2065         mutex_unlock(&ifmgd->mtx);
2066
2067         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2068         if (!wk)
2069                 return -ENOMEM;
2070
2071         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2072         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2073
2074         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2075                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2076                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2077                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2078                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2079
2080
2081         if (req->ie && req->ie_len) {
2082                 memcpy(wk->ie, req->ie, req->ie_len);
2083                 wk->ie_len = req->ie_len;
2084         } else
2085                 wk->ie_len = 0;
2086
2087         wk->assoc.bss = req->bss;
2088
2089         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2090
2091         /* new association always uses requested smps mode */
2092         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2093                 if (ifmgd->powersave)
2094                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2095                 else
2096                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2097         } else
2098                 ifmgd->ap_smps = ifmgd->req_smps;
2099
2100         wk->assoc.smps = ifmgd->ap_smps;
2101         /*
2102          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2103          * We still associate in non-HT mode (11a/b/g) if any one of these
2104          * ciphers is configured as pairwise.
2105          * We can set this to true for non-11n hardware, that'll be checked
2106          * separately along with the peer capabilities.
2107          */
2108         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2109         wk->assoc.capability = req->bss->capability;
2110         wk->assoc.wmm_used = bss->wmm_used;
2111         wk->assoc.supp_rates = bss->supp_rates;
2112         wk->assoc.supp_rates_len = bss->supp_rates_len;
2113         wk->assoc.ht_information_ie =
2114                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2115
2116         if (bss->wmm_used && bss->uapsd_supported &&
2117             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2118                 wk->assoc.uapsd_used = true;
2119                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2120         } else {
2121                 wk->assoc.uapsd_used = false;
2122                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2123         }
2124
2125         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2126         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2127         wk->assoc.ssid_len = ssid[1];
2128
2129         if (req->prev_bssid)
2130                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2131
2132         wk->type = IEEE80211_WORK_ASSOC;
2133         wk->chan = req->bss->channel;
2134         wk->sdata = sdata;
2135         wk->done = ieee80211_assoc_done;
2136
2137         if (req->use_mfp) {
2138                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2139                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2140         } else {
2141                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2142                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2143         }
2144
2145         if (req->crypto.control_port)
2146                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2147         else
2148                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2149
2150         ieee80211_add_work(wk);
2151         return 0;
2152 }
2153
2154 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2155                          struct cfg80211_deauth_request *req,
2156                          void *cookie)
2157 {
2158         struct ieee80211_local *local = sdata->local;
2159         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2160         struct ieee80211_work *wk;
2161         const u8 *bssid = req->bss->bssid;
2162
2163         mutex_lock(&ifmgd->mtx);
2164
2165         if (ifmgd->associated == req->bss) {
2166                 bssid = req->bss->bssid;
2167                 ieee80211_set_disassoc(sdata, true);
2168                 mutex_unlock(&ifmgd->mtx);
2169         } else {
2170                 bool not_auth_yet = false;
2171
2172                 mutex_unlock(&ifmgd->mtx);
2173
2174                 mutex_lock(&local->work_mtx);
2175                 list_for_each_entry(wk, &local->work_list, list) {
2176                         if (wk->sdata != sdata)
2177                                 continue;
2178
2179                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2180                             wk->type != IEEE80211_WORK_AUTH &&
2181                             wk->type != IEEE80211_WORK_ASSOC)
2182                                 continue;
2183
2184                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2185                                 continue;
2186
2187                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2188                         list_del_rcu(&wk->list);
2189                         free_work(wk);
2190                         break;
2191                 }
2192                 mutex_unlock(&local->work_mtx);
2193
2194                 /*
2195                  * If somebody requests authentication and we haven't
2196                  * sent out an auth frame yet there's no need to send
2197                  * out a deauth frame either. If the state was PROBE,
2198                  * then this is the case. If it's AUTH we have sent a
2199                  * frame, and if it's IDLE we have completed the auth
2200                  * process already.
2201                  */
2202                 if (not_auth_yet) {
2203                         __cfg80211_auth_canceled(sdata->dev, bssid);
2204                         return 0;
2205                 }
2206         }
2207
2208         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2209                sdata->name, bssid, req->reason_code);
2210
2211         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2212                                        req->reason_code, cookie,
2213                                        !req->local_state_change);
2214
2215         ieee80211_recalc_idle(sdata->local);
2216
2217         return 0;
2218 }
2219
2220 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2221                            struct cfg80211_disassoc_request *req,
2222                            void *cookie)
2223 {
2224         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2225         u8 bssid[ETH_ALEN];
2226
2227         mutex_lock(&ifmgd->mtx);
2228
2229         /*
2230          * cfg80211 should catch this ... but it's racy since
2231          * we can receive a disassoc frame, process it, hand it
2232          * to cfg80211 while that's in a locked section already
2233          * trying to tell us that the user wants to disconnect.
2234          */
2235         if (ifmgd->associated != req->bss) {
2236                 mutex_unlock(&ifmgd->mtx);
2237                 return -ENOLINK;
2238         }
2239
2240         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2241                sdata->name, req->bss->bssid, req->reason_code);
2242
2243         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2244         ieee80211_set_disassoc(sdata, false);
2245
2246         mutex_unlock(&ifmgd->mtx);
2247
2248         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2249                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2250                         cookie, !req->local_state_change);
2251         sta_info_destroy_addr(sdata, bssid);
2252
2253         ieee80211_recalc_idle(sdata->local);
2254
2255         return 0;
2256 }
2257
2258 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2259                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2260                                gfp_t gfp)
2261 {
2262         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2263
2264         trace_api_cqm_rssi_notify(sdata, rssi_event);
2265
2266         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2267 }
2268 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);