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, ht_changed;
 141         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 142
 143         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 144
 145         /* HT is not supported */
 146         if (!sband->ht_cap.ht_supported)
 147                 enable_ht = false;
 148
 149         /* check that channel matches the right operating channel */
 150         if (local->hw.conf.channel->center_freq !=
 151             ieee80211_channel_to_frequency(hti->control_chan))
 152                 enable_ht = false;
 153
 154         if (enable_ht) {
 155                 channel_type = NL80211_CHAN_HT20;
 156
 157                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 158                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 159                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 160                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 161                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 162                                 if (!(local->hw.conf.channel->flags &
 163                                     IEEE80211_CHAN_NO_HT40PLUS))
 164                                         channel_type = NL80211_CHAN_HT40PLUS;
 165                                 break;
 166                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 167                                 if (!(local->hw.conf.channel->flags &
 168                                     IEEE80211_CHAN_NO_HT40MINUS))
 169                                         channel_type = NL80211_CHAN_HT40MINUS;
 170                                 break;
 171                         }
 172                 }
 173         }
 174
 175         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 176                      channel_type != local->hw.conf.channel_type;
 177
 178         if (local->tmp_channel)
 179                 local->tmp_channel_type = channel_type;
 180         local->oper_channel_type = channel_type;
 181
 182         if (ht_changed) {
 183                 /* channel_type change automatically detected */
 184                 ieee80211_hw_config(local, 0);
 185
 186                 rcu_read_lock();
 187                 sta = sta_info_get(sdata, bssid);
 188                 if (sta)
 189                         rate_control_rate_update(local, sband, sta,
 190                                                  IEEE80211_RC_HT_CHANGED,
 191                                                  local->oper_channel_type);
 192                 rcu_read_unlock();
 193         }
 194
 195         /* disable HT */
 196         if (!enable_ht)
 197                 return 0;
 198
 199         ht_opmode = le16_to_cpu(hti->operation_mode);
 200
 201         /* if bss configuration changed store the new one */
 202         if (!sdata->ht_opmode_valid ||
 203             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 204                 changed |= BSS_CHANGED_HT;
 205                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 206                 sdata->ht_opmode_valid = true;
 207         }
 208
 209         return changed;
 210 }
 211
 212 /* frame sending functions */
 213
 214 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 215                                            const u8 *bssid, u16 stype, u16 reason,
 216                                            void *cookie, bool send_frame)
 217 {
 218         struct ieee80211_local *local = sdata->local;
 219         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 220         struct sk_buff *skb;
 221         struct ieee80211_mgmt *mgmt;
 222
 223         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 224         if (!skb) {
 225                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 226                        "deauth/disassoc frame\n", sdata->name);
 227                 return;
 228         }
 229         skb_reserve(skb, local->hw.extra_tx_headroom);
 230
 231         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 232         memset(mgmt, 0, 24);
 233         memcpy(mgmt->da, bssid, ETH_ALEN);
 234         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 235         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 236         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 237         skb_put(skb, 2);
 238         /* u.deauth.reason_code == u.disassoc.reason_code */
 239         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 240
 241         if (stype == IEEE80211_STYPE_DEAUTH)
 242                 if (cookie)
 243                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 244                 else
 245                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 246         else
 247                 if (cookie)
 248                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 249                 else
 250                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 251         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 252                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 253
 254         if (send_frame)
 255                 ieee80211_tx_skb(sdata, skb);
 256         else
 257                 kfree_skb(skb);
 258 }
 259
 260 void ieee80211_send_pspoll(struct ieee80211_local *local,
 261                            struct ieee80211_sub_if_data *sdata)
 262 {
 263         struct ieee80211_pspoll *pspoll;
 264         struct sk_buff *skb;
 265
 266         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 267         if (!skb)
 268                 return;
 269
 270         pspoll = (struct ieee80211_pspoll *) skb->data;
 271         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 272
 273         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 274         ieee80211_tx_skb(sdata, skb);
 275 }
 276
 277 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 278                              struct ieee80211_sub_if_data *sdata,
 279                              int powersave)
 280 {
 281         struct sk_buff *skb;
 282         struct ieee80211_hdr_3addr *nullfunc;
 283
 284         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 285         if (!skb)
 286                 return;
 287
 288         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 289         if (powersave)
 290                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 291
 292         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 293         ieee80211_tx_skb(sdata, skb);
 294 }
 295
 296 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 297                                           struct ieee80211_sub_if_data *sdata)
 298 {
 299         struct sk_buff *skb;
 300         struct ieee80211_hdr *nullfunc;
 301         __le16 fc;
 302
 303         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 304                 return;
 305
 306         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 307         if (!skb) {
 308                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 309                        "nullfunc frame\n", sdata->name);
 310                 return;
 311         }
 312         skb_reserve(skb, local->hw.extra_tx_headroom);
 313
 314         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 315         memset(nullfunc, 0, 30);
 316         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 317                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 318         nullfunc->frame_control = fc;
 319         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 320         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 321         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 322         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 323
 324         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 325         ieee80211_tx_skb(sdata, skb);
 326 }
 327
 328 /* spectrum management related things */
 329 static void ieee80211_chswitch_work(struct work_struct *work)
 330 {
 331         struct ieee80211_sub_if_data *sdata =
 332                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 333         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 334
 335         if (!ieee80211_sdata_running(sdata))
 336                 return;
 337
 338         mutex_lock(&ifmgd->mtx);
 339         if (!ifmgd->associated)
 340                 goto out;
 341
 342         sdata->local->oper_channel = sdata->local->csa_channel;
 343         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 344
 345         /* XXX: shouldn't really modify cfg80211-owned data! */
 346         ifmgd->associated->channel = sdata->local->oper_channel;
 347
 348         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 349                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 350  out:
 351         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 352         mutex_unlock(&ifmgd->mtx);
 353 }
 354
 355 static void ieee80211_chswitch_timer(unsigned long data)
 356 {
 357         struct ieee80211_sub_if_data *sdata =
 358                 (struct ieee80211_sub_if_data *) data;
 359         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 360
 361         if (sdata->local->quiescing) {
 362                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 363                 return;
 364         }
 365
 366         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 367 }
 368
 369 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 370                                       struct ieee80211_channel_sw_ie *sw_elem,
 371                                       struct ieee80211_bss *bss)
 372 {
 373         struct cfg80211_bss *cbss =
 374                 container_of((void *)bss, struct cfg80211_bss, priv);
 375         struct ieee80211_channel *new_ch;
 376         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 377         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 378
 379         ASSERT_MGD_MTX(ifmgd);
 380
 381         if (!ifmgd->associated)
 382                 return;
 383
 384         if (sdata->local->scanning)
 385                 return;
 386
 387         /* Disregard subsequent beacons if we are already running a timer
 388            processing a CSA */
 389
 390         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 391                 return;
 392
 393         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 394         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 395                 return;
 396
 397         sdata->local->csa_channel = new_ch;
 398
 399         if (sw_elem->count <= 1) {
 400                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 401         } else {
 402                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 403                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 404                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 405                 mod_timer(&ifmgd->chswitch_timer,
 406                           jiffies +
 407                           msecs_to_jiffies(sw_elem->count *
 408                                            cbss->beacon_interval));
 409         }
 410 }
 411
 412 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 413                                         u16 capab_info, u8 *pwr_constr_elem,
 414                                         u8 pwr_constr_elem_len)
 415 {
 416         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 417
 418         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 419                 return;
 420
 421         /* Power constraint IE length should be 1 octet */
 422         if (pwr_constr_elem_len != 1)
 423                 return;
 424
 425         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 426             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 427                 sdata->local->power_constr_level = *pwr_constr_elem;
 428                 ieee80211_hw_config(sdata->local, 0);
 429         }
 430 }
 431
 432 /* powersave */
 433 static void ieee80211_enable_ps(struct ieee80211_local *local,
 434                                 struct ieee80211_sub_if_data *sdata)
 435 {
 436         struct ieee80211_conf *conf = &local->hw.conf;
 437
 438         /*
 439          * If we are scanning right now then the parameters will
 440          * take effect when scan finishes.
 441          */
 442         if (local->scanning)
 443                 return;
 444
 445         if (conf->dynamic_ps_timeout > 0 &&
 446             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 447                 mod_timer(&local->dynamic_ps_timer, jiffies +
 448                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 449         } else {
 450                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 451                         ieee80211_send_nullfunc(local, sdata, 1);
 452
 453                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 454                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 455                         return;
 456
 457                 conf->flags |= IEEE80211_CONF_PS;
 458                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 459         }
 460 }
 461
 462 static void ieee80211_change_ps(struct ieee80211_local *local)
 463 {
 464         struct ieee80211_conf *conf = &local->hw.conf;
 465
 466         if (local->ps_sdata) {
 467                 ieee80211_enable_ps(local, local->ps_sdata);
 468         } else if (conf->flags & IEEE80211_CONF_PS) {
 469                 conf->flags &= ~IEEE80211_CONF_PS;
 470                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 471                 del_timer_sync(&local->dynamic_ps_timer);
 472                 cancel_work_sync(&local->dynamic_ps_enable_work);
 473         }
 474 }
 475
 476 /* need to hold RTNL or interface lock */
 477 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 478 {
 479         struct ieee80211_sub_if_data *sdata, *found = NULL;
 480         int count = 0;
 481
 482         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 483                 local->ps_sdata = NULL;
 484                 return;
 485         }
 486
 487         if (!list_empty(&local->work_list)) {
 488                 local->ps_sdata = NULL;
 489                 goto change;
 490         }
 491
 492         list_for_each_entry(sdata, &local->interfaces, list) {
 493                 if (!ieee80211_sdata_running(sdata))
 494                         continue;
 495                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 496                         continue;
 497                 found = sdata;
 498                 count++;
 499         }
 500
 501         if (count == 1 && found->u.mgd.powersave &&
 502             found->u.mgd.associated &&
 503             found->u.mgd.associated->beacon_ies &&
 504             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 505                                     IEEE80211_STA_CONNECTION_POLL))) {
 506                 s32 beaconint_us;
 507
 508                 if (latency < 0)
 509                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 510
 511                 beaconint_us = ieee80211_tu_to_usec(
 512                                         found->vif.bss_conf.beacon_int);
 513
 514                 if (beaconint_us > latency) {
 515                         local->ps_sdata = NULL;
 516                 } else {
 517                         struct ieee80211_bss *bss;
 518                         int maxslp = 1;
 519                         u8 dtimper;
 520
 521                         bss = (void *)found->u.mgd.associated->priv;
 522                         dtimper = bss->dtim_period;
 523
 524                         /* If the TIM IE is invalid, pretend the value is 1 */
 525                         if (!dtimper)
 526                                 dtimper = 1;
 527                         else if (dtimper > 1)
 528                                 maxslp = min_t(int, dtimper,
 529                                                     latency / beaconint_us);
 530
 531                         local->hw.conf.max_sleep_period = maxslp;
 532                         local->hw.conf.ps_dtim_period = dtimper;
 533                         local->ps_sdata = found;
 534                 }
 535         } else {
 536                 local->ps_sdata = NULL;
 537         }
 538
 539  change:
 540         ieee80211_change_ps(local);
 541 }
 542
 543 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 544 {
 545         struct ieee80211_local *local =
 546                 container_of(work, struct ieee80211_local,
 547                              dynamic_ps_disable_work);
 548
 549         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 550                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 551                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 552         }
 553
 554         ieee80211_wake_queues_by_reason(&local->hw,
 555                                         IEEE80211_QUEUE_STOP_REASON_PS);
 556 }
 557
 558 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 559 {
 560         struct ieee80211_local *local =
 561                 container_of(work, struct ieee80211_local,
 562                              dynamic_ps_enable_work);
 563         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 564         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 565
 566         /* can only happen when PS was just disabled anyway */
 567         if (!sdata)
 568                 return;
 569
 570         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 571                 return;
 572
 573         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 574             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 575                 ieee80211_send_nullfunc(local, sdata, 1);
 576
 577         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 578               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 579             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 580                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 581                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 582                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 583         }
 584 }
 585
 586 void ieee80211_dynamic_ps_timer(unsigned long data)
 587 {
 588         struct ieee80211_local *local = (void *) data;
 589
 590         if (local->quiescing || local->suspended)
 591                 return;
 592
 593         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 594 }
 595
 596 /* MLME */
 597 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 598                                      struct ieee80211_if_managed *ifmgd,
 599                                      u8 *wmm_param, size_t wmm_param_len)
 600 {
 601         struct ieee80211_tx_queue_params params;
 602         size_t left;
 603         int count;
 604         u8 *pos, uapsd_queues = 0;
 605
 606         if (!local->ops->conf_tx)
 607                 return;
 608
 609         if (local->hw.queues < 4)
 610                 return;
 611
 612         if (!wmm_param)
 613                 return;
 614
 615         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 616                 return;
 617
 618         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 619                 uapsd_queues = local->uapsd_queues;
 620
 621         count = wmm_param[6] & 0x0f;
 622         if (count == ifmgd->wmm_last_param_set)
 623                 return;
 624         ifmgd->wmm_last_param_set = count;
 625
 626         pos = wmm_param + 8;
 627         left = wmm_param_len - 8;
 628
 629         memset(&params, 0, sizeof(params));
 630
 631         local->wmm_acm = 0;
 632         for (; left >= 4; left -= 4, pos += 4) {
 633                 int aci = (pos[0] >> 5) & 0x03;
 634                 int acm = (pos[0] >> 4) & 0x01;
 635                 bool uapsd = false;
 636                 int queue;
 637
 638                 switch (aci) {
 639                 case 1: /* AC_BK */
 640                         queue = 3;
 641                         if (acm)
 642                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 643                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 644                                 uapsd = true;
 645                         break;
 646                 case 2: /* AC_VI */
 647                         queue = 1;
 648                         if (acm)
 649                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 650                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 651                                 uapsd = true;
 652                         break;
 653                 case 3: /* AC_VO */
 654                         queue = 0;
 655                         if (acm)
 656                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 657                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 658                                 uapsd = true;
 659                         break;
 660                 case 0: /* AC_BE */
 661                 default:
 662                         queue = 2;
 663                         if (acm)
 664                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 665                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 666                                 uapsd = true;
 667                         break;
 668                 }
 669
 670                 params.aifs = pos[0] & 0x0f;
 671                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 672                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 673                 params.txop = get_unaligned_le16(pos + 2);
 674                 params.uapsd = uapsd;
 675
 676 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 677                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 678                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 679                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 680                        params.aifs, params.cw_min, params.cw_max, params.txop,
 681                        params.uapsd);
 682 #endif
 683                 if (drv_conf_tx(local, queue, &params))
 684                         printk(KERN_DEBUG "%s: failed to set TX queue "
 685                                "parameters for queue %d\n",
 686                                wiphy_name(local->hw.wiphy), queue);
 687         }
 688
 689         /* enable WMM or activate new settings */
 690         local->hw.conf.flags |= IEEE80211_CONF_QOS;
 691         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 692 }
 693
 694 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 695                                            u16 capab, bool erp_valid, u8 erp)
 696 {
 697         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 698         u32 changed = 0;
 699         bool use_protection;
 700         bool use_short_preamble;
 701         bool use_short_slot;
 702
 703         if (erp_valid) {
 704                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 705                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 706         } else {
 707                 use_protection = false;
 708                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 709         }
 710
 711         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 712         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 713                 use_short_slot = true;
 714
 715         if (use_protection != bss_conf->use_cts_prot) {
 716                 bss_conf->use_cts_prot = use_protection;
 717                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 718         }
 719
 720         if (use_short_preamble != bss_conf->use_short_preamble) {
 721                 bss_conf->use_short_preamble = use_short_preamble;
 722                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 723         }
 724
 725         if (use_short_slot != bss_conf->use_short_slot) {
 726                 bss_conf->use_short_slot = use_short_slot;
 727                 changed |= BSS_CHANGED_ERP_SLOT;
 728         }
 729
 730         return changed;
 731 }
 732
 733 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 734                                      struct cfg80211_bss *cbss,
 735                                      u32 bss_info_changed)
 736 {
 737         struct ieee80211_bss *bss = (void *)cbss->priv;
 738         struct ieee80211_local *local = sdata->local;
 739
 740         bss_info_changed |= BSS_CHANGED_ASSOC;
 741         /* set timing information */
 742         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 743         sdata->vif.bss_conf.timestamp = cbss->tsf;
 744
 745         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 746         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 747                 cbss->capability, bss->has_erp_value, bss->erp_value);
 748
 749         sdata->u.mgd.associated = cbss;
 750         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 751
 752         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 753
 754         /* just to be sure */
 755         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 756                                 IEEE80211_STA_BEACON_POLL);
 757
 758         /*
 759          * Always handle WMM once after association regardless
 760          * of the first value the AP uses. Setting -1 here has
 761          * that effect because the AP values is an unsigned
 762          * 4-bit value.
 763          */
 764         sdata->u.mgd.wmm_last_param_set = -1;
 765
 766         ieee80211_led_assoc(local, 1);
 767
 768         sdata->vif.bss_conf.assoc = 1;
 769         /*
 770          * For now just always ask the driver to update the basic rateset
 771          * when we have associated, we aren't checking whether it actually
 772          * changed or not.
 773          */
 774         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 775
 776         /* And the BSSID changed - we're associated now */
 777         bss_info_changed |= BSS_CHANGED_BSSID;
 778
 779         /* Tell the driver to monitor connection quality (if supported) */
 780         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 781             sdata->vif.bss_conf.cqm_rssi_thold)
 782                 bss_info_changed |= BSS_CHANGED_CQM;
 783
 784         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 785
 786         mutex_lock(&local->iflist_mtx);
 787         ieee80211_recalc_ps(local, -1);
 788         ieee80211_recalc_smps(local, sdata);
 789         mutex_unlock(&local->iflist_mtx);
 790
 791         netif_tx_start_all_queues(sdata->dev);
 792         netif_carrier_on(sdata->dev);
 793 }
 794
 795 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 796                                    bool remove_sta)
 797 {
 798         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 799         struct ieee80211_local *local = sdata->local;
 800         struct sta_info *sta;
 801         u32 changed = 0, config_changed = 0;
 802         u8 bssid[ETH_ALEN];
 803
 804         ASSERT_MGD_MTX(ifmgd);
 805
 806         if (WARN_ON(!ifmgd->associated))
 807                 return;
 808
 809         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 810
 811         ifmgd->associated = NULL;
 812         memset(ifmgd->bssid, 0, ETH_ALEN);
 813
 814         /*
 815          * we need to commit the associated = NULL change because the
 816          * scan code uses that to determine whether this iface should
 817          * go to/wake up from powersave or not -- and could otherwise
 818          * wake the queues erroneously.
 819          */
 820         smp_mb();
 821
 822         /*
 823          * Thus, we can only afterwards stop the queues -- to account
 824          * for the case where another CPU is finishing a scan at this
 825          * time -- we don't want the scan code to enable queues.
 826          */
 827
 828         netif_tx_stop_all_queues(sdata->dev);
 829         netif_carrier_off(sdata->dev);
 830
 831         rcu_read_lock();
 832         sta = sta_info_get(sdata, bssid);
 833         if (sta) {
 834                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 835                 ieee80211_sta_tear_down_BA_sessions(sta);
 836         }
 837         rcu_read_unlock();
 838
 839         changed |= ieee80211_reset_erp_info(sdata);
 840
 841         ieee80211_led_assoc(local, 0);
 842         changed |= BSS_CHANGED_ASSOC;
 843         sdata->vif.bss_conf.assoc = false;
 844
 845         ieee80211_set_wmm_default(sdata);
 846
 847         /* channel(_type) changes are handled by ieee80211_hw_config */
 848         local->oper_channel_type = NL80211_CHAN_NO_HT;
 849
 850         /* on the next assoc, re-program HT parameters */
 851         sdata->ht_opmode_valid = false;
 852
 853         local->power_constr_level = 0;
 854
 855         del_timer_sync(&local->dynamic_ps_timer);
 856         cancel_work_sync(&local->dynamic_ps_enable_work);
 857
 858         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 859                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 860                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 861         }
 862
 863         ieee80211_hw_config(local, config_changed);
 864
 865         /* And the BSSID changed -- not very interesting here */
 866         changed |= BSS_CHANGED_BSSID;
 867         ieee80211_bss_info_change_notify(sdata, changed);
 868
 869         if (remove_sta)
 870                 sta_info_destroy_addr(sdata, bssid);
 871 }
 872
 873 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 874                              struct ieee80211_hdr *hdr)
 875 {
 876         /*
 877          * We can postpone the mgd.timer whenever receiving unicast frames
 878          * from AP because we know that the connection is working both ways
 879          * at that time. But multicast frames (and hence also beacons) must
 880          * be ignored here, because we need to trigger the timer during
 881          * data idle periods for sending the periodic probe request to the
 882          * AP we're connected to.
 883          */
 884         if (is_multicast_ether_addr(hdr->addr1))
 885                 return;
 886
 887         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 888                 return;
 889
 890         mod_timer(&sdata->u.mgd.conn_mon_timer,
 891                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 892 }
 893
 894 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 895 {
 896         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 897         const u8 *ssid;
 898
 899         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 900         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 901                                  ssid + 2, ssid[1], NULL, 0);
 902
 903         ifmgd->probe_send_count++;
 904         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 905         run_again(ifmgd, ifmgd->probe_timeout);
 906 }
 907
 908 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 909                                    bool beacon)
 910 {
 911         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 912         bool already = false;
 913
 914         if (!ieee80211_sdata_running(sdata))
 915                 return;
 916
 917         if (sdata->local->scanning)
 918                 return;
 919
 920         if (sdata->local->tmp_channel)
 921                 return;
 922
 923         mutex_lock(&ifmgd->mtx);
 924
 925         if (!ifmgd->associated)
 926                 goto out;
 927
 928 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 929         if (beacon && net_ratelimit())
 930                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 931                        "- sending probe request\n", sdata->name);
 932 #endif
 933
 934         /*
 935          * The driver/our work has already reported this event or the
 936          * connection monitoring has kicked in and we have already sent
 937          * a probe request. Or maybe the AP died and the driver keeps
 938          * reporting until we disassociate...
 939          *
 940          * In either case we have to ignore the current call to this
 941          * function (except for setting the correct probe reason bit)
 942          * because otherwise we would reset the timer every time and
 943          * never check whether we received a probe response!
 944          */
 945         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 946                             IEEE80211_STA_CONNECTION_POLL))
 947                 already = true;
 948
 949         if (beacon)
 950                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 951         else
 952                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 953
 954         if (already)
 955                 goto out;
 956
 957         mutex_lock(&sdata->local->iflist_mtx);
 958         ieee80211_recalc_ps(sdata->local, -1);
 959         mutex_unlock(&sdata->local->iflist_mtx);
 960
 961         ifmgd->probe_send_count = 0;
 962         ieee80211_mgd_probe_ap_send(sdata);
 963  out:
 964         mutex_unlock(&ifmgd->mtx);
 965 }
 966
 967 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 968 {
 969         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 970         struct ieee80211_local *local = sdata->local;
 971         u8 bssid[ETH_ALEN];
 972
 973         mutex_lock(&ifmgd->mtx);
 974         if (!ifmgd->associated) {
 975                 mutex_unlock(&ifmgd->mtx);
 976                 return;
 977         }
 978
 979         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 980
 981         printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
 982
 983         ieee80211_set_disassoc(sdata, true);
 984         ieee80211_recalc_idle(local);
 985         mutex_unlock(&ifmgd->mtx);
 986         /*
 987          * must be outside lock due to cfg80211,
 988          * but that's not a problem.
 989          */
 990         ieee80211_send_deauth_disassoc(sdata, bssid,
 991                                        IEEE80211_STYPE_DEAUTH,
 992                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
 993                                        NULL, true);
 994 }
 995
 996 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
 997 {
 998         struct ieee80211_sub_if_data *sdata =
 999                 container_of(work, struct ieee80211_sub_if_data,
1000                              u.mgd.beacon_connection_loss_work);
1001
1002         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1003                 __ieee80211_connection_loss(sdata);
1004         else
1005                 ieee80211_mgd_probe_ap(sdata, true);
1006 }
1007
1008 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1009 {
1010         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1011         struct ieee80211_hw *hw = &sdata->local->hw;
1012
1013         trace_api_beacon_loss(sdata);
1014
1015         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1016         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1017 }
1018 EXPORT_SYMBOL(ieee80211_beacon_loss);
1019
1020 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1021 {
1022         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1023         struct ieee80211_hw *hw = &sdata->local->hw;
1024
1025         trace_api_connection_loss(sdata);
1026
1027         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1028         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1029 }
1030 EXPORT_SYMBOL(ieee80211_connection_loss);
1031
1032
1033 static enum rx_mgmt_action __must_check
1034 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1035                          struct ieee80211_mgmt *mgmt, size_t len)
1036 {
1037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1038         const u8 *bssid = NULL;
1039         u16 reason_code;
1040
1041         if (len < 24 + 2)
1042                 return RX_MGMT_NONE;
1043
1044         ASSERT_MGD_MTX(ifmgd);
1045
1046         bssid = ifmgd->associated->bssid;
1047
1048         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1049
1050         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1051                         sdata->name, bssid, reason_code);
1052
1053         ieee80211_set_disassoc(sdata, true);
1054         ieee80211_recalc_idle(sdata->local);
1055
1056         return RX_MGMT_CFG80211_DEAUTH;
1057 }
1058
1059
1060 static enum rx_mgmt_action __must_check
1061 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1062                            struct ieee80211_mgmt *mgmt, size_t len)
1063 {
1064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1065         u16 reason_code;
1066
1067         if (len < 24 + 2)
1068                 return RX_MGMT_NONE;
1069
1070         ASSERT_MGD_MTX(ifmgd);
1071
1072         if (WARN_ON(!ifmgd->associated))
1073                 return RX_MGMT_NONE;
1074
1075         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1076                 return RX_MGMT_NONE;
1077
1078         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1079
1080         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1081                         sdata->name, mgmt->sa, reason_code);
1082
1083         ieee80211_set_disassoc(sdata, true);
1084         ieee80211_recalc_idle(sdata->local);
1085         return RX_MGMT_CFG80211_DISASSOC;
1086 }
1087
1088
1089 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1090                                     struct ieee80211_mgmt *mgmt, size_t len)
1091 {
1092         struct ieee80211_sub_if_data *sdata = wk->sdata;
1093         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1094         struct ieee80211_local *local = sdata->local;
1095         struct ieee80211_supported_band *sband;
1096         struct sta_info *sta;
1097         struct cfg80211_bss *cbss = wk->assoc.bss;
1098         u8 *pos;
1099         u32 rates, basic_rates;
1100         u16 capab_info, aid;
1101         struct ieee802_11_elems elems;
1102         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1103         u32 changed = 0;
1104         int i, j, err;
1105         bool have_higher_than_11mbit = false;
1106         u16 ap_ht_cap_flags;
1107
1108         /* AssocResp and ReassocResp have identical structure */
1109
1110         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1111         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1112
1113         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1114                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1115                        "set\n", sdata->name, aid);
1116         aid &= ~(BIT(15) | BIT(14));
1117
1118         pos = mgmt->u.assoc_resp.variable;
1119         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1120
1121         if (!elems.supp_rates) {
1122                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1123                        sdata->name);
1124                 return false;
1125         }
1126
1127         ifmgd->aid = aid;
1128
1129         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1130         if (!sta) {
1131                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1132                        " the AP\n", sdata->name);
1133                 return false;
1134         }
1135
1136         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1137                            WLAN_STA_ASSOC_AP);
1138         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1139                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1140
1141         rates = 0;
1142         basic_rates = 0;
1143         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1144
1145         for (i = 0; i < elems.supp_rates_len; i++) {
1146                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1147                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1148
1149                 if (rate > 110)
1150                         have_higher_than_11mbit = true;
1151
1152                 for (j = 0; j < sband->n_bitrates; j++) {
1153                         if (sband->bitrates[j].bitrate == rate) {
1154                                 rates |= BIT(j);
1155                                 if (is_basic)
1156                                         basic_rates |= BIT(j);
1157                                 break;
1158                         }
1159                 }
1160         }
1161
1162         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1163                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1164                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1165
1166                 if (rate > 110)
1167                         have_higher_than_11mbit = true;
1168
1169                 for (j = 0; j < sband->n_bitrates; j++) {
1170                         if (sband->bitrates[j].bitrate == rate) {
1171                                 rates |= BIT(j);
1172                                 if (is_basic)
1173                                         basic_rates |= BIT(j);
1174                                 break;
1175                         }
1176                 }
1177         }
1178
1179         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1180         sdata->vif.bss_conf.basic_rates = basic_rates;
1181
1182         /* cf. IEEE 802.11 9.2.12 */
1183         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1184             have_higher_than_11mbit)
1185                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1186         else
1187                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1188
1189         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1190                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1191                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1192
1193         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1194
1195         rate_control_rate_init(sta);
1196
1197         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1198                 set_sta_flags(sta, WLAN_STA_MFP);
1199
1200         if (elems.wmm_param)
1201                 set_sta_flags(sta, WLAN_STA_WME);
1202
1203         err = sta_info_insert(sta);
1204         sta = NULL;
1205         if (err) {
1206                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1207                        " the AP (error %d)\n", sdata->name, err);
1208                 return false;
1209         }
1210
1211         if (elems.wmm_param)
1212                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1213                                          elems.wmm_param_len);
1214         else
1215                 ieee80211_set_wmm_default(sdata);
1216
1217         local->oper_channel = wk->chan;
1218
1219         if (elems.ht_info_elem && elems.wmm_param &&
1220             (sdata->local->hw.queues >= 4) &&
1221             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1222                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1223                                                cbss->bssid, ap_ht_cap_flags);
1224
1225         /* set AID and assoc capability,
1226          * ieee80211_set_associated() will tell the driver */
1227         bss_conf->aid = aid;
1228         bss_conf->assoc_capability = capab_info;
1229         ieee80211_set_associated(sdata, cbss, changed);
1230
1231         /*
1232          * If we're using 4-addr mode, let the AP know that we're
1233          * doing so, so that it can create the STA VLAN on its side
1234          */
1235         if (ifmgd->use_4addr)
1236                 ieee80211_send_4addr_nullfunc(local, sdata);
1237
1238         /*
1239          * Start timer to probe the connection to the AP now.
1240          * Also start the timer that will detect beacon loss.
1241          */
1242         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1243         mod_beacon_timer(sdata);
1244
1245         return true;
1246 }
1247
1248
1249 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1250                                   struct ieee80211_mgmt *mgmt,
1251                                   size_t len,
1252                                   struct ieee80211_rx_status *rx_status,
1253                                   struct ieee802_11_elems *elems,
1254                                   bool beacon)
1255 {
1256         struct ieee80211_local *local = sdata->local;
1257         int freq;
1258         struct ieee80211_bss *bss;
1259         struct ieee80211_channel *channel;
1260         bool need_ps = false;
1261
1262         if (sdata->u.mgd.associated) {
1263                 bss = (void *)sdata->u.mgd.associated->priv;
1264                 /* not previously set so we may need to recalc */
1265                 need_ps = !bss->dtim_period;
1266         }
1267
1268         if (elems->ds_params && elems->ds_params_len == 1)
1269                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1270         else
1271                 freq = rx_status->freq;
1272
1273         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1274
1275         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1276                 return;
1277
1278         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1279                                         channel, beacon);
1280         if (bss)
1281                 ieee80211_rx_bss_put(local, bss);
1282
1283         if (!sdata->u.mgd.associated)
1284                 return;
1285
1286         if (need_ps) {
1287                 mutex_lock(&local->iflist_mtx);
1288                 ieee80211_recalc_ps(local, -1);
1289                 mutex_unlock(&local->iflist_mtx);
1290         }
1291
1292         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1293             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1294                                                         ETH_ALEN) == 0)) {
1295                 struct ieee80211_channel_sw_ie *sw_elem =
1296                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1297                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1298         }
1299 }
1300
1301
1302 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1303                                          struct sk_buff *skb)
1304 {
1305         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1306         struct ieee80211_if_managed *ifmgd;
1307         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1308         size_t baselen, len = skb->len;
1309         struct ieee802_11_elems elems;
1310
1311         ifmgd = &sdata->u.mgd;
1312
1313         ASSERT_MGD_MTX(ifmgd);
1314
1315         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1316                 return; /* ignore ProbeResp to foreign address */
1317
1318         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1319         if (baselen > len)
1320                 return;
1321
1322         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1323                                 &elems);
1324
1325         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1326
1327         if (ifmgd->associated &&
1328             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1329             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1330                             IEEE80211_STA_CONNECTION_POLL)) {
1331                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1332                                   IEEE80211_STA_BEACON_POLL);
1333                 mutex_lock(&sdata->local->iflist_mtx);
1334                 ieee80211_recalc_ps(sdata->local, -1);
1335                 mutex_unlock(&sdata->local->iflist_mtx);
1336
1337                 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1338                         return;
1339
1340                 /*
1341                  * We've received a probe response, but are not sure whether
1342                  * we have or will be receiving any beacons or data, so let's
1343                  * schedule the timers again, just in case.
1344                  */
1345                 mod_beacon_timer(sdata);
1346
1347                 mod_timer(&ifmgd->conn_mon_timer,
1348                           round_jiffies_up(jiffies +
1349                                            IEEE80211_CONNECTION_IDLE_TIME));
1350         }
1351 }
1352
1353 /*
1354  * This is the canonical list of information elements we care about,
1355  * the filter code also gives us all changes to the Microsoft OUI
1356  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1357  *
1358  * We implement beacon filtering in software since that means we can
1359  * avoid processing the frame here and in cfg80211, and userspace
1360  * will not be able to tell whether the hardware supports it or not.
1361  *
1362  * XXX: This list needs to be dynamic -- userspace needs to be able to
1363  *      add items it requires. It also needs to be able to tell us to
1364  *      look out for other vendor IEs.
1365  */
1366 static const u64 care_about_ies =
1367         (1ULL << WLAN_EID_COUNTRY) |
1368         (1ULL << WLAN_EID_ERP_INFO) |
1369         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1370         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1371         (1ULL << WLAN_EID_HT_CAPABILITY) |
1372         (1ULL << WLAN_EID_HT_INFORMATION);
1373
1374 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1375                                      struct ieee80211_mgmt *mgmt,
1376                                      size_t len,
1377                                      struct ieee80211_rx_status *rx_status)
1378 {
1379         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1380         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1381         size_t baselen;
1382         struct ieee802_11_elems elems;
1383         struct ieee80211_local *local = sdata->local;
1384         u32 changed = 0;
1385         bool erp_valid, directed_tim = false;
1386         u8 erp_value = 0;
1387         u32 ncrc;
1388         u8 *bssid;
1389
1390         ASSERT_MGD_MTX(ifmgd);
1391
1392         /* Process beacon from the current BSS */
1393         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1394         if (baselen > len)
1395                 return;
1396
1397         if (rx_status->freq != local->hw.conf.channel->center_freq)
1398                 return;
1399
1400         /*
1401          * We might have received a number of frames, among them a
1402          * disassoc frame and a beacon...
1403          */
1404         if (!ifmgd->associated)
1405                 return;
1406
1407         bssid = ifmgd->associated->bssid;
1408
1409         /*
1410          * And in theory even frames from a different AP we were just
1411          * associated to a split-second ago!
1412          */
1413         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1414                 return;
1415
1416         /* Track average RSSI from the Beacon frames of the current AP */
1417         ifmgd->last_beacon_signal = rx_status->signal;
1418         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1419                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1420                 ifmgd->ave_beacon_signal = rx_status->signal;
1421                 ifmgd->last_cqm_event_signal = 0;
1422         } else {
1423                 ifmgd->ave_beacon_signal =
1424                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1425                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1426                          ifmgd->ave_beacon_signal) / 16;
1427         }
1428         if (bss_conf->cqm_rssi_thold &&
1429             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1430                 int sig = ifmgd->ave_beacon_signal / 16;
1431                 int last_event = ifmgd->last_cqm_event_signal;
1432                 int thold = bss_conf->cqm_rssi_thold;
1433                 int hyst = bss_conf->cqm_rssi_hyst;
1434                 if (sig < thold &&
1435                     (last_event == 0 || sig < last_event - hyst)) {
1436                         ifmgd->last_cqm_event_signal = sig;
1437                         ieee80211_cqm_rssi_notify(
1438                                 &sdata->vif,
1439                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1440                                 GFP_KERNEL);
1441                 } else if (sig > thold &&
1442                            (last_event == 0 || sig > last_event + hyst)) {
1443                         ifmgd->last_cqm_event_signal = sig;
1444                         ieee80211_cqm_rssi_notify(
1445                                 &sdata->vif,
1446                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1447                                 GFP_KERNEL);
1448                 }
1449         }
1450
1451         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1452 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1453                 if (net_ratelimit()) {
1454                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1455                                "to a received beacon\n", sdata->name);
1456                 }
1457 #endif
1458                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1459                 mutex_lock(&local->iflist_mtx);
1460                 ieee80211_recalc_ps(local, -1);
1461                 mutex_unlock(&local->iflist_mtx);
1462         }
1463
1464         /*
1465          * Push the beacon loss detection into the future since
1466          * we are processing a beacon from the AP just now.
1467          */
1468         mod_beacon_timer(sdata);
1469
1470         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1471         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1472                                           len - baselen, &elems,
1473                                           care_about_ies, ncrc);
1474
1475         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1476                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1477                                                    ifmgd->aid);
1478
1479         if (ncrc != ifmgd->beacon_crc) {
1480                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1481                                       true);
1482
1483                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1484                                          elems.wmm_param_len);
1485         }
1486
1487         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1488                 if (directed_tim) {
1489                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1490                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1491                                 ieee80211_hw_config(local,
1492                                                     IEEE80211_CONF_CHANGE_PS);
1493                                 ieee80211_send_nullfunc(local, sdata, 0);
1494                         } else {
1495                                 local->pspolling = true;
1496
1497                                 /*
1498                                  * Here is assumed that the driver will be
1499                                  * able to send ps-poll frame and receive a
1500                                  * response even though power save mode is
1501                                  * enabled, but some drivers might require
1502                                  * to disable power save here. This needs
1503                                  * to be investigated.
1504                                  */
1505                                 ieee80211_send_pspoll(local, sdata);
1506                         }
1507                 }
1508         }
1509
1510         if (ncrc == ifmgd->beacon_crc)
1511                 return;
1512         ifmgd->beacon_crc = ncrc;
1513
1514         if (elems.erp_info && elems.erp_info_len >= 1) {
1515                 erp_valid = true;
1516                 erp_value = elems.erp_info[0];
1517         } else {
1518                 erp_valid = false;
1519         }
1520         changed |= ieee80211_handle_bss_capability(sdata,
1521                         le16_to_cpu(mgmt->u.beacon.capab_info),
1522                         erp_valid, erp_value);
1523
1524
1525         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1526             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1527                 struct sta_info *sta;
1528                 struct ieee80211_supported_band *sband;
1529                 u16 ap_ht_cap_flags;
1530
1531                 rcu_read_lock();
1532
1533                 sta = sta_info_get(sdata, bssid);
1534                 if (WARN_ON(!sta)) {
1535                         rcu_read_unlock();
1536                         return;
1537                 }
1538
1539                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1540
1541                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1542                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1543
1544                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1545
1546                 rcu_read_unlock();
1547
1548                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1549                                                bssid, ap_ht_cap_flags);
1550         }
1551
1552         /* Note: country IE parsing is done for us by cfg80211 */
1553         if (elems.country_elem) {
1554                 /* TODO: IBSS also needs this */
1555                 if (elems.pwr_constr_elem)
1556                         ieee80211_handle_pwr_constr(sdata,
1557                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1558                                 elems.pwr_constr_elem,
1559                                 elems.pwr_constr_elem_len);
1560         }
1561
1562         ieee80211_bss_info_change_notify(sdata, changed);
1563 }
1564
1565 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1566                                           struct sk_buff *skb)
1567 {
1568         struct ieee80211_local *local = sdata->local;
1569         struct ieee80211_mgmt *mgmt;
1570         u16 fc;
1571
1572         if (skb->len < 24)
1573                 return RX_DROP_MONITOR;
1574
1575         mgmt = (struct ieee80211_mgmt *) skb->data;
1576         fc = le16_to_cpu(mgmt->frame_control);
1577
1578         switch (fc & IEEE80211_FCTL_STYPE) {
1579         case IEEE80211_STYPE_PROBE_RESP:
1580         case IEEE80211_STYPE_BEACON:
1581         case IEEE80211_STYPE_DEAUTH:
1582         case IEEE80211_STYPE_DISASSOC:
1583         case IEEE80211_STYPE_ACTION:
1584                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1585                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1586                 return RX_QUEUED;
1587         }
1588
1589         return RX_DROP_MONITOR;
1590 }
1591
1592 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1593                                          struct sk_buff *skb)
1594 {
1595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1596         struct ieee80211_rx_status *rx_status;
1597         struct ieee80211_mgmt *mgmt;
1598         enum rx_mgmt_action rma = RX_MGMT_NONE;
1599         u16 fc;
1600
1601         rx_status = (struct ieee80211_rx_status *) skb->cb;
1602         mgmt = (struct ieee80211_mgmt *) skb->data;
1603         fc = le16_to_cpu(mgmt->frame_control);
1604
1605         mutex_lock(&ifmgd->mtx);
1606
1607         if (ifmgd->associated &&
1608             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1609                 switch (fc & IEEE80211_FCTL_STYPE) {
1610                 case IEEE80211_STYPE_BEACON:
1611                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1612                                                  rx_status);
1613                         break;
1614                 case IEEE80211_STYPE_PROBE_RESP:
1615                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1616                         break;
1617                 case IEEE80211_STYPE_DEAUTH:
1618                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1619                         break;
1620                 case IEEE80211_STYPE_DISASSOC:
1621                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1622                         break;
1623                 case IEEE80211_STYPE_ACTION:
1624                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1625                                 break;
1626
1627                         ieee80211_sta_process_chanswitch(sdata,
1628                                         &mgmt->u.action.u.chan_switch.sw_elem,
1629                                         (void *)ifmgd->associated->priv);
1630                         break;
1631                 }
1632                 mutex_unlock(&ifmgd->mtx);
1633
1634                 switch (rma) {
1635                 case RX_MGMT_NONE:
1636                         /* no action */
1637                         break;
1638                 case RX_MGMT_CFG80211_DEAUTH:
1639                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1640                         break;
1641                 case RX_MGMT_CFG80211_DISASSOC:
1642                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1643                         break;
1644                 default:
1645                         WARN(1, "unexpected: %d", rma);
1646                 }
1647                 goto out;
1648         }
1649
1650         mutex_unlock(&ifmgd->mtx);
1651
1652         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1653             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1654                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1655
1656  out:
1657         kfree_skb(skb);
1658 }
1659
1660 static void ieee80211_sta_timer(unsigned long data)
1661 {
1662         struct ieee80211_sub_if_data *sdata =
1663                 (struct ieee80211_sub_if_data *) data;
1664         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1665         struct ieee80211_local *local = sdata->local;
1666
1667         if (local->quiescing) {
1668                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1669                 return;
1670         }
1671
1672         ieee80211_queue_work(&local->hw, &ifmgd->work);
1673 }
1674
1675 static void ieee80211_sta_work(struct work_struct *work)
1676 {
1677         struct ieee80211_sub_if_data *sdata =
1678                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1679         struct ieee80211_local *local = sdata->local;
1680         struct ieee80211_if_managed *ifmgd;
1681         struct sk_buff *skb;
1682
1683         if (!ieee80211_sdata_running(sdata))
1684                 return;
1685
1686         if (local->scanning)
1687                 return;
1688
1689         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1690                 return;
1691
1692         /*
1693          * ieee80211_queue_work() should have picked up most cases,
1694          * here we'll pick the the rest.
1695          */
1696         if (WARN(local->suspended, "STA MLME work scheduled while "
1697                  "going to suspend\n"))
1698                 return;
1699
1700         ifmgd = &sdata->u.mgd;
1701
1702         /* first process frames to avoid timing out while a frame is pending */
1703         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1704                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1705
1706         /* then process the rest of the work */
1707         mutex_lock(&ifmgd->mtx);
1708
1709         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1710                             IEEE80211_STA_CONNECTION_POLL) &&
1711             ifmgd->associated) {
1712                 u8 bssid[ETH_ALEN];
1713
1714                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1715                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1716                         run_again(ifmgd, ifmgd->probe_timeout);
1717
1718                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1719 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1720                         printk(KERN_DEBUG "No probe response from AP %pM"
1721                                 " after %dms, try %d\n", bssid,
1722                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1723                                 ifmgd->probe_send_count);
1724 #endif
1725                         ieee80211_mgd_probe_ap_send(sdata);
1726                 } else {
1727                         /*
1728                          * We actually lost the connection ... or did we?
1729                          * Let's make sure!
1730                          */
1731                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1732                                           IEEE80211_STA_BEACON_POLL);
1733                         printk(KERN_DEBUG "No probe response from AP %pM"
1734                                 " after %dms, disconnecting.\n",
1735                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1736                         ieee80211_set_disassoc(sdata, true);
1737                         ieee80211_recalc_idle(local);
1738                         mutex_unlock(&ifmgd->mtx);
1739                         /*
1740                          * must be outside lock due to cfg80211,
1741                          * but that's not a problem.
1742                          */
1743                         ieee80211_send_deauth_disassoc(sdata, bssid,
1744                                         IEEE80211_STYPE_DEAUTH,
1745                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1746                                         NULL, true);
1747                         mutex_lock(&ifmgd->mtx);
1748                 }
1749         }
1750
1751         mutex_unlock(&ifmgd->mtx);
1752 }
1753
1754 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1755 {
1756         struct ieee80211_sub_if_data *sdata =
1757                 (struct ieee80211_sub_if_data *) data;
1758         struct ieee80211_local *local = sdata->local;
1759
1760         if (local->quiescing)
1761                 return;
1762
1763         ieee80211_queue_work(&sdata->local->hw,
1764                              &sdata->u.mgd.beacon_connection_loss_work);
1765 }
1766
1767 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1768 {
1769         struct ieee80211_sub_if_data *sdata =
1770                 (struct ieee80211_sub_if_data *) data;
1771         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1772         struct ieee80211_local *local = sdata->local;
1773
1774         if (local->quiescing)
1775                 return;
1776
1777         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1778 }
1779
1780 static void ieee80211_sta_monitor_work(struct work_struct *work)
1781 {
1782         struct ieee80211_sub_if_data *sdata =
1783                 container_of(work, struct ieee80211_sub_if_data,
1784                              u.mgd.monitor_work);
1785
1786         ieee80211_mgd_probe_ap(sdata, false);
1787 }
1788
1789 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1790 {
1791         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1792                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1793                                         IEEE80211_STA_CONNECTION_POLL);
1794
1795                 /* let's probe the connection once */
1796                 ieee80211_queue_work(&sdata->local->hw,
1797                            &sdata->u.mgd.monitor_work);
1798                 /* and do all the other regular work too */
1799                 ieee80211_queue_work(&sdata->local->hw,
1800                            &sdata->u.mgd.work);
1801         }
1802 }
1803
1804 #ifdef CONFIG_PM
1805 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1806 {
1807         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1808
1809         /*
1810          * we need to use atomic bitops for the running bits
1811          * only because both timers might fire at the same
1812          * time -- the code here is properly synchronised.
1813          */
1814
1815         cancel_work_sync(&ifmgd->work);
1816         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1817         if (del_timer_sync(&ifmgd->timer))
1818                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1819
1820         cancel_work_sync(&ifmgd->chswitch_work);
1821         if (del_timer_sync(&ifmgd->chswitch_timer))
1822                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1823
1824         cancel_work_sync(&ifmgd->monitor_work);
1825         /* these will just be re-established on connection */
1826         del_timer_sync(&ifmgd->conn_mon_timer);
1827         del_timer_sync(&ifmgd->bcn_mon_timer);
1828 }
1829
1830 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1831 {
1832         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1833
1834         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1835                 add_timer(&ifmgd->timer);
1836         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1837                 add_timer(&ifmgd->chswitch_timer);
1838 }
1839 #endif
1840
1841 /* interface setup */
1842 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1843 {
1844         struct ieee80211_if_managed *ifmgd;
1845
1846         ifmgd = &sdata->u.mgd;
1847         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1848         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1849         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1850         INIT_WORK(&ifmgd->beacon_connection_loss_work,
1851                   ieee80211_beacon_connection_loss_work);
1852         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1853                     (unsigned long) sdata);
1854         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1855                     (unsigned long) sdata);
1856         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1857                     (unsigned long) sdata);
1858         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1859                     (unsigned long) sdata);
1860         skb_queue_head_init(&ifmgd->skb_queue);
1861
1862         ifmgd->flags = 0;
1863
1864         mutex_init(&ifmgd->mtx);
1865
1866         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1867                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1868         else
1869                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1870 }
1871
1872 /* scan finished notification */
1873 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1874 {
1875         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1876
1877         /* Restart STA timers */
1878         rcu_read_lock();
1879         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1880                 ieee80211_restart_sta_timer(sdata);
1881         rcu_read_unlock();
1882 }
1883
1884 int ieee80211_max_network_latency(struct notifier_block *nb,
1885                                   unsigned long data, void *dummy)
1886 {
1887         s32 latency_usec = (s32) data;
1888         struct ieee80211_local *local =
1889                 container_of(nb, struct ieee80211_local,
1890                              network_latency_notifier);
1891
1892         mutex_lock(&local->iflist_mtx);
1893         ieee80211_recalc_ps(local, latency_usec);
1894         mutex_unlock(&local->iflist_mtx);
1895
1896         return 0;
1897 }
1898
1899 /* config hooks */
1900 static enum work_done_result
1901 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1902                           struct sk_buff *skb)
1903 {
1904         if (!skb) {
1905                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1906                 return WORK_DONE_DESTROY;
1907         }
1908
1909         if (wk->type == IEEE80211_WORK_AUTH) {
1910                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1911                 return WORK_DONE_DESTROY;
1912         }
1913
1914         mutex_lock(&wk->sdata->u.mgd.mtx);
1915         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1916         mutex_unlock(&wk->sdata->u.mgd.mtx);
1917
1918         wk->type = IEEE80211_WORK_AUTH;
1919         wk->probe_auth.tries = 0;
1920         return WORK_DONE_REQUEUE;
1921 }
1922
1923 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1924                        struct cfg80211_auth_request *req)
1925 {
1926         const u8 *ssid;
1927         struct ieee80211_work *wk;
1928         u16 auth_alg;
1929
1930         if (req->local_state_change)
1931                 return 0; /* no need to update mac80211 state */
1932
1933         switch (req->auth_type) {
1934         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1935                 auth_alg = WLAN_AUTH_OPEN;
1936                 break;
1937         case NL80211_AUTHTYPE_SHARED_KEY:
1938                 auth_alg = WLAN_AUTH_SHARED_KEY;
1939                 break;
1940         case NL80211_AUTHTYPE_FT:
1941                 auth_alg = WLAN_AUTH_FT;
1942                 break;
1943         case NL80211_AUTHTYPE_NETWORK_EAP:
1944                 auth_alg = WLAN_AUTH_LEAP;
1945                 break;
1946         default:
1947                 return -EOPNOTSUPP;
1948         }
1949
1950         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1951         if (!wk)
1952                 return -ENOMEM;
1953
1954         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1955
1956         if (req->ie && req->ie_len) {
1957                 memcpy(wk->ie, req->ie, req->ie_len);
1958                 wk->ie_len = req->ie_len;
1959         }
1960
1961         if (req->key && req->key_len) {
1962                 wk->probe_auth.key_len = req->key_len;
1963                 wk->probe_auth.key_idx = req->key_idx;
1964                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1965         }
1966
1967         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1968         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1969         wk->probe_auth.ssid_len = ssid[1];
1970
1971         wk->probe_auth.algorithm = auth_alg;
1972         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1973
1974         /* if we already have a probe, don't probe again */
1975         if (req->bss->proberesp_ies)
1976                 wk->type = IEEE80211_WORK_AUTH;
1977         else
1978                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1979         wk->chan = req->bss->channel;
1980         wk->sdata = sdata;
1981         wk->done = ieee80211_probe_auth_done;
1982
1983         ieee80211_add_work(wk);
1984         return 0;
1985 }
1986
1987 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1988                                                   struct sk_buff *skb)
1989 {
1990         struct ieee80211_mgmt *mgmt;
1991         u16 status;
1992
1993         if (!skb) {
1994                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1995                 return WORK_DONE_DESTROY;
1996         }
1997
1998         mgmt = (void *)skb->data;
1999         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2000
2001         if (status == WLAN_STATUS_SUCCESS) {
2002                 mutex_lock(&wk->sdata->u.mgd.mtx);
2003                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2004                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2005                         /* oops -- internal error -- send timeout for now */
2006                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2007                                                     wk->filter_ta);
2008                         return WORK_DONE_DESTROY;
2009                 }
2010                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2011         }
2012
2013         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2014         return WORK_DONE_DESTROY;
2015 }
2016
2017 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2018                         struct cfg80211_assoc_request *req)
2019 {
2020         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2021         struct ieee80211_bss *bss = (void *)req->bss->priv;
2022         struct ieee80211_work *wk;
2023         const u8 *ssid;
2024         int i;
2025
2026         mutex_lock(&ifmgd->mtx);
2027         if (ifmgd->associated) {
2028                 if (!req->prev_bssid ||
2029                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2030                            ETH_ALEN)) {
2031                         /*
2032                          * We are already associated and the request was not a
2033                          * reassociation request from the current BSS, so
2034                          * reject it.
2035                          */
2036                         mutex_unlock(&ifmgd->mtx);
2037                         return -EALREADY;
2038                 }
2039
2040                 /* Trying to reassociate - clear previous association state */
2041                 ieee80211_set_disassoc(sdata, true);
2042         }
2043         mutex_unlock(&ifmgd->mtx);
2044
2045         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2046         if (!wk)
2047                 return -ENOMEM;
2048
2049         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2050         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2051
2052         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2053                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2054                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2055                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2056                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2057
2058
2059         if (req->ie && req->ie_len) {
2060                 memcpy(wk->ie, req->ie, req->ie_len);
2061                 wk->ie_len = req->ie_len;
2062         } else
2063                 wk->ie_len = 0;
2064
2065         wk->assoc.bss = req->bss;
2066
2067         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2068
2069         /* new association always uses requested smps mode */
2070         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2071                 if (ifmgd->powersave)
2072                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2073                 else
2074                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2075         } else
2076                 ifmgd->ap_smps = ifmgd->req_smps;
2077
2078         wk->assoc.smps = ifmgd->ap_smps;
2079         /*
2080          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2081          * We still associate in non-HT mode (11a/b/g) if any one of these
2082          * ciphers is configured as pairwise.
2083          * We can set this to true for non-11n hardware, that'll be checked
2084          * separately along with the peer capabilities.
2085          */
2086         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2087         wk->assoc.capability = req->bss->capability;
2088         wk->assoc.wmm_used = bss->wmm_used;
2089         wk->assoc.supp_rates = bss->supp_rates;
2090         wk->assoc.supp_rates_len = bss->supp_rates_len;
2091         wk->assoc.ht_information_ie =
2092                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2093
2094         if (bss->wmm_used && bss->uapsd_supported &&
2095             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2096                 wk->assoc.uapsd_used = true;
2097                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2098         } else {
2099                 wk->assoc.uapsd_used = false;
2100                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2101         }
2102
2103         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2104         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2105         wk->assoc.ssid_len = ssid[1];
2106
2107         if (req->prev_bssid)
2108                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2109
2110         wk->type = IEEE80211_WORK_ASSOC;
2111         wk->chan = req->bss->channel;
2112         wk->sdata = sdata;
2113         wk->done = ieee80211_assoc_done;
2114
2115         if (req->use_mfp) {
2116                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2117                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2118         } else {
2119                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2120                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2121         }
2122
2123         if (req->crypto.control_port)
2124                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2125         else
2126                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2127
2128         ieee80211_add_work(wk);
2129         return 0;
2130 }
2131
2132 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2133                          struct cfg80211_deauth_request *req,
2134                          void *cookie)
2135 {
2136         struct ieee80211_local *local = sdata->local;
2137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2138         struct ieee80211_work *wk;
2139         const u8 *bssid = req->bss->bssid;
2140
2141         mutex_lock(&ifmgd->mtx);
2142
2143         if (ifmgd->associated == req->bss) {
2144                 bssid = req->bss->bssid;
2145                 ieee80211_set_disassoc(sdata, true);
2146                 mutex_unlock(&ifmgd->mtx);
2147         } else {
2148                 bool not_auth_yet = false;
2149
2150                 mutex_unlock(&ifmgd->mtx);
2151
2152                 mutex_lock(&local->work_mtx);
2153                 list_for_each_entry(wk, &local->work_list, list) {
2154                         if (wk->sdata != sdata)
2155                                 continue;
2156
2157                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2158                             wk->type != IEEE80211_WORK_AUTH)
2159                                 continue;
2160
2161                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2162                                 continue;
2163
2164                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2165                         list_del_rcu(&wk->list);
2166                         free_work(wk);
2167                         break;
2168                 }
2169                 mutex_unlock(&local->work_mtx);
2170
2171                 /*
2172                  * If somebody requests authentication and we haven't
2173                  * sent out an auth frame yet there's no need to send
2174                  * out a deauth frame either. If the state was PROBE,
2175                  * then this is the case. If it's AUTH we have sent a
2176                  * frame, and if it's IDLE we have completed the auth
2177                  * process already.
2178                  */
2179                 if (not_auth_yet) {
2180                         __cfg80211_auth_canceled(sdata->dev, bssid);
2181                         return 0;
2182                 }
2183         }
2184
2185         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2186                sdata->name, bssid, req->reason_code);
2187
2188         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2189                                        req->reason_code, cookie,
2190                                        !req->local_state_change);
2191
2192         ieee80211_recalc_idle(sdata->local);
2193
2194         return 0;
2195 }
2196
2197 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2198                            struct cfg80211_disassoc_request *req,
2199                            void *cookie)
2200 {
2201         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2202         u8 bssid[ETH_ALEN];
2203
2204         mutex_lock(&ifmgd->mtx);
2205
2206         /*
2207          * cfg80211 should catch this ... but it's racy since
2208          * we can receive a disassoc frame, process it, hand it
2209          * to cfg80211 while that's in a locked section already
2210          * trying to tell us that the user wants to disconnect.
2211          */
2212         if (ifmgd->associated != req->bss) {
2213                 mutex_unlock(&ifmgd->mtx);
2214                 return -ENOLINK;
2215         }
2216
2217         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2218                sdata->name, req->bss->bssid, req->reason_code);
2219
2220         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2221         ieee80211_set_disassoc(sdata, false);
2222
2223         mutex_unlock(&ifmgd->mtx);
2224
2225         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2226                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2227                         cookie, !req->local_state_change);
2228         sta_info_destroy_addr(sdata, bssid);
2229
2230         ieee80211_recalc_idle(sdata->local);
2231
2232         return 0;
2233 }
2234
2235 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2236                          struct ieee80211_channel *chan,
2237                          enum nl80211_channel_type channel_type,
2238                          const u8 *buf, size_t len, u64 *cookie)
2239 {
2240         struct ieee80211_local *local = sdata->local;
2241         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2242         struct sk_buff *skb;
2243
2244         /* Check that we are on the requested channel for transmission */
2245         if ((chan != local->tmp_channel ||
2246              channel_type != local->tmp_channel_type) &&
2247             (chan != local->oper_channel ||
2248              channel_type != local->oper_channel_type))
2249                 return -EBUSY;
2250
2251         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2252         if (!skb)
2253                 return -ENOMEM;
2254         skb_reserve(skb, local->hw.extra_tx_headroom);
2255
2256         memcpy(skb_put(skb, len), buf, len);
2257
2258         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2259                 IEEE80211_SKB_CB(skb)->flags |=
2260                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2261         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2262                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2263         skb->dev = sdata->dev;
2264         ieee80211_tx_skb(sdata, skb);
2265
2266         *cookie = (unsigned long) skb;
2267         return 0;
2268 }
2269
2270 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2271                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2272                                gfp_t gfp)
2273 {
2274         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2275
2276         trace_api_cqm_rssi_notify(sdata, rssi_event);
2277
2278         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2279 }
2280 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);