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 static int max_nullfunc_tries = 2;
  32 module_param(max_nullfunc_tries, int, 0644);
  33 MODULE_PARM_DESC(max_nullfunc_tries,
  34                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  35
  36 static int max_probe_tries = 5;
  37 module_param(max_probe_tries, int, 0644);
  38 MODULE_PARM_DESC(max_probe_tries,
  39                  "Maximum probe tries before disconnecting (reason 4).");
  40
  41 /*
  42  * Beacon loss timeout is calculated as N frames times the
  43  * advertised beacon interval.  This may need to be somewhat
  44  * higher than what hardware might detect to account for
  45  * delays in the host processing frames. But since we also
  46  * probe on beacon miss before declaring the connection lost
  47  * default to what we want.
  48  */
  49 #define IEEE80211_BEACON_LOSS_COUNT     7
  50
  51 /*
  52  * Time the connection can be idle before we probe
  53  * it to see if we can still talk to the AP.
  54  */
  55 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  56 /*
  57  * Time we wait for a probe response after sending
  58  * a probe request because of beacon loss or for
  59  * checking the connection still works.
  60  */
  61 static int probe_wait_ms = 500;
  62 module_param(probe_wait_ms, int, 0644);
  63 MODULE_PARM_DESC(probe_wait_ms,
  64                  "Maximum time(ms) to wait for probe response"
  65                  " before disconnecting (reason 4).");
  66
  67 /*
  68  * Weight given to the latest Beacon frame when calculating average signal
  69  * strength for Beacon frames received in the current BSS. This must be
  70  * between 1 and 15.
  71  */
  72 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  73
  74 /*
  75  * How many Beacon frames need to have been used in average signal strength
  76  * before starting to indicate signal change events.
  77  */
  78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  79
  80 #define TMR_RUNNING_TIMER       0
  81 #define TMR_RUNNING_CHANSW      1
  82
  83 /*
  84  * All cfg80211 functions have to be called outside a locked
  85  * section so that they can acquire a lock themselves... This
  86  * is much simpler than queuing up things in cfg80211, but we
  87  * do need some indirection for that here.
  88  */
  89 enum rx_mgmt_action {
  90         /* no action required */
  91         RX_MGMT_NONE,
  92
  93         /* caller must call cfg80211_send_rx_auth() */
  94         RX_MGMT_CFG80211_AUTH,
  95
  96         /* caller must call cfg80211_send_rx_assoc() */
  97         RX_MGMT_CFG80211_ASSOC,
  98
  99         /* caller must call cfg80211_send_deauth() */
 100         RX_MGMT_CFG80211_DEAUTH,
 101
 102         /* caller must call cfg80211_send_disassoc() */
 103         RX_MGMT_CFG80211_DISASSOC,
 104
 105         /* caller must tell cfg80211 about internal error */
 106         RX_MGMT_CFG80211_ASSOC_ERROR,
 107 };
 108
 109 /* utils */
 110 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 111 {
 112         lockdep_assert_held(&ifmgd->mtx);
 113 }
 114
 115 /*
 116  * We can have multiple work items (and connection probing)
 117  * scheduling this timer, but we need to take care to only
 118  * reschedule it when it should fire _earlier_ than it was
 119  * asked for before, or if it's not pending right now. This
 120  * function ensures that. Note that it then is required to
 121  * run this function for all timeouts after the first one
 122  * has happened -- the work that runs from this timer will
 123  * do that.
 124  */
 125 static void run_again(struct ieee80211_if_managed *ifmgd,
 126                              unsigned long timeout)
 127 {
 128         ASSERT_MGD_MTX(ifmgd);
 129
 130         if (!timer_pending(&ifmgd->timer) ||
 131             time_before(timeout, ifmgd->timer.expires))
 132                 mod_timer(&ifmgd->timer, timeout);
 133 }
 134
 135 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 136 {
 137         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 141                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 142 }
 143
 144 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 147
 148         if (unlikely(!sdata->u.mgd.associated))
 149                 return;
 150
 151         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 152                 return;
 153
 154         mod_timer(&sdata->u.mgd.conn_mon_timer,
 155                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 156
 157         ifmgd->probe_send_count = 0;
 158 }
 159
 160 static int ecw2cw(int ecw)
 161 {
 162         return (1 << ecw) - 1;
 163 }
 164
 165 /*
 166  * ieee80211_enable_ht should be called only after the operating band
 167  * has been determined as ht configuration depends on the hw's
 168  * HT abilities for a specific band.
 169  */
 170 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 171                                struct ieee80211_ht_info *hti,
 172                                const u8 *bssid, u16 ap_ht_cap_flags)
 173 {
 174         struct ieee80211_local *local = sdata->local;
 175         struct ieee80211_supported_band *sband;
 176         struct sta_info *sta;
 177         u32 changed = 0;
 178         int hti_cfreq;
 179         u16 ht_opmode;
 180         bool enable_ht = true;
 181         enum nl80211_channel_type prev_chantype;
 182         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 183
 184         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 185
 186         prev_chantype = sdata->vif.bss_conf.channel_type;
 187
 188         /* HT is not supported */
 189         if (!sband->ht_cap.ht_supported)
 190                 enable_ht = false;
 191
 192         if (enable_ht) {
 193                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 194                                                            sband->band);
 195                 /* check that channel matches the right operating channel */
 196                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 197                         /* Some APs mess this up, evidently.
 198                          * Netgear WNDR3700 sometimes reports 4 higher than
 199                          * the actual channel, for instance.
 200                          */
 201                         printk(KERN_DEBUG
 202                                "%s: Wrong control channel in association"
 203                                " response: configured center-freq: %d"
 204                                " hti-cfreq: %d  hti->control_chan: %d"
 205                                " band: %d.  Disabling HT.\n",
 206                                sdata->name,
 207                                local->hw.conf.channel->center_freq,
 208                                hti_cfreq, hti->control_chan,
 209                                sband->band);
 210                         enable_ht = false;
 211                 }
 212         }
 213
 214         if (enable_ht) {
 215                 channel_type = NL80211_CHAN_HT20;
 216
 217                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 218                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 219                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 220                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 221                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 222                                 if (!(local->hw.conf.channel->flags &
 223                                     IEEE80211_CHAN_NO_HT40PLUS))
 224                                         channel_type = NL80211_CHAN_HT40PLUS;
 225                                 break;
 226                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 227                                 if (!(local->hw.conf.channel->flags &
 228                                     IEEE80211_CHAN_NO_HT40MINUS))
 229                                         channel_type = NL80211_CHAN_HT40MINUS;
 230                                 break;
 231                         }
 232                 }
 233         }
 234
 235         if (local->tmp_channel)
 236                 local->tmp_channel_type = channel_type;
 237
 238         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 239                 /* can only fail due to HT40+/- mismatch */
 240                 channel_type = NL80211_CHAN_HT20;
 241                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 242         }
 243
 244         /* channel_type change automatically detected */
 245         ieee80211_hw_config(local, 0);
 246
 247         if (prev_chantype != channel_type) {
 248                 rcu_read_lock();
 249                 sta = sta_info_get(sdata, bssid);
 250                 if (sta)
 251                         rate_control_rate_update(local, sband, sta,
 252                                                  IEEE80211_RC_HT_CHANGED,
 253                                                  channel_type);
 254                 rcu_read_unlock();
 255         }
 256
 257         ht_opmode = le16_to_cpu(hti->operation_mode);
 258
 259         /* if bss configuration changed store the new one */
 260         if (sdata->ht_opmode_valid != enable_ht ||
 261             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 262             prev_chantype != channel_type) {
 263                 changed |= BSS_CHANGED_HT;
 264                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 265                 sdata->ht_opmode_valid = enable_ht;
 266         }
 267
 268         return changed;
 269 }
 270
 271 /* frame sending functions */
 272
 273 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 274                                            const u8 *bssid, u16 stype, u16 reason,
 275                                            void *cookie, bool send_frame)
 276 {
 277         struct ieee80211_local *local = sdata->local;
 278         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 279         struct sk_buff *skb;
 280         struct ieee80211_mgmt *mgmt;
 281
 282         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 283         if (!skb) {
 284                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 285                        "deauth/disassoc frame\n", sdata->name);
 286                 return;
 287         }
 288         skb_reserve(skb, local->hw.extra_tx_headroom);
 289
 290         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 291         memset(mgmt, 0, 24);
 292         memcpy(mgmt->da, bssid, ETH_ALEN);
 293         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 294         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 295         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 296         skb_put(skb, 2);
 297         /* u.deauth.reason_code == u.disassoc.reason_code */
 298         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 299
 300         if (stype == IEEE80211_STYPE_DEAUTH)
 301                 if (cookie)
 302                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 303                 else
 304                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 305         else
 306                 if (cookie)
 307                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 308                 else
 309                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 310         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 311                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 312
 313         if (send_frame)
 314                 ieee80211_tx_skb(sdata, skb);
 315         else
 316                 kfree_skb(skb);
 317 }
 318
 319 void ieee80211_send_pspoll(struct ieee80211_local *local,
 320                            struct ieee80211_sub_if_data *sdata)
 321 {
 322         struct ieee80211_pspoll *pspoll;
 323         struct sk_buff *skb;
 324
 325         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 326         if (!skb)
 327                 return;
 328
 329         pspoll = (struct ieee80211_pspoll *) skb->data;
 330         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 331
 332         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 333         ieee80211_tx_skb(sdata, skb);
 334 }
 335
 336 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 337                              struct ieee80211_sub_if_data *sdata,
 338                              int powersave)
 339 {
 340         struct sk_buff *skb;
 341         struct ieee80211_hdr_3addr *nullfunc;
 342
 343         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 344         if (!skb)
 345                 return;
 346
 347         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 348         if (powersave)
 349                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 350
 351         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 352         ieee80211_tx_skb(sdata, skb);
 353 }
 354
 355 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 356                                           struct ieee80211_sub_if_data *sdata)
 357 {
 358         struct sk_buff *skb;
 359         struct ieee80211_hdr *nullfunc;
 360         __le16 fc;
 361
 362         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 363                 return;
 364
 365         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 366         if (!skb) {
 367                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 368                        "nullfunc frame\n", sdata->name);
 369                 return;
 370         }
 371         skb_reserve(skb, local->hw.extra_tx_headroom);
 372
 373         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 374         memset(nullfunc, 0, 30);
 375         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 376                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 377         nullfunc->frame_control = fc;
 378         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 379         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 380         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 381         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 382
 383         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 384         ieee80211_tx_skb(sdata, skb);
 385 }
 386
 387 /* spectrum management related things */
 388 static void ieee80211_chswitch_work(struct work_struct *work)
 389 {
 390         struct ieee80211_sub_if_data *sdata =
 391                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 392         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 393
 394         if (!ieee80211_sdata_running(sdata))
 395                 return;
 396
 397         mutex_lock(&ifmgd->mtx);
 398         if (!ifmgd->associated)
 399                 goto out;
 400
 401         sdata->local->oper_channel = sdata->local->csa_channel;
 402         if (!sdata->local->ops->channel_switch) {
 403                 /* call "hw_config" only if doing sw channel switch */
 404                 ieee80211_hw_config(sdata->local,
 405                         IEEE80211_CONF_CHANGE_CHANNEL);
 406         }
 407
 408         /* XXX: shouldn't really modify cfg80211-owned data! */
 409         ifmgd->associated->channel = sdata->local->oper_channel;
 410
 411         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 412                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 413  out:
 414         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 415         mutex_unlock(&ifmgd->mtx);
 416 }
 417
 418 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 419 {
 420         struct ieee80211_sub_if_data *sdata;
 421         struct ieee80211_if_managed *ifmgd;
 422
 423         sdata = vif_to_sdata(vif);
 424         ifmgd = &sdata->u.mgd;
 425
 426         trace_api_chswitch_done(sdata, success);
 427         if (!success) {
 428                 /*
 429                  * If the channel switch was not successful, stay
 430                  * around on the old channel. We currently lack
 431                  * good handling of this situation, possibly we
 432                  * should just drop the association.
 433                  */
 434                 sdata->local->csa_channel = sdata->local->oper_channel;
 435         }
 436
 437         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 438 }
 439 EXPORT_SYMBOL(ieee80211_chswitch_done);
 440
 441 static void ieee80211_chswitch_timer(unsigned long data)
 442 {
 443         struct ieee80211_sub_if_data *sdata =
 444                 (struct ieee80211_sub_if_data *) data;
 445         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 446
 447         if (sdata->local->quiescing) {
 448                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 449                 return;
 450         }
 451
 452         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 453 }
 454
 455 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 456                                       struct ieee80211_channel_sw_ie *sw_elem,
 457                                       struct ieee80211_bss *bss,
 458                                       u64 timestamp)
 459 {
 460         struct cfg80211_bss *cbss =
 461                 container_of((void *)bss, struct cfg80211_bss, priv);
 462         struct ieee80211_channel *new_ch;
 463         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 464         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 465                                                       cbss->channel->band);
 466
 467         ASSERT_MGD_MTX(ifmgd);
 468
 469         if (!ifmgd->associated)
 470                 return;
 471
 472         if (sdata->local->scanning)
 473                 return;
 474
 475         /* Disregard subsequent beacons if we are already running a timer
 476            processing a CSA */
 477
 478         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 479                 return;
 480
 481         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 482         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 483                 return;
 484
 485         sdata->local->csa_channel = new_ch;
 486
 487         if (sdata->local->ops->channel_switch) {
 488                 /* use driver's channel switch callback */
 489                 struct ieee80211_channel_switch ch_switch;
 490                 memset(&ch_switch, 0, sizeof(ch_switch));
 491                 ch_switch.timestamp = timestamp;
 492                 if (sw_elem->mode) {
 493                         ch_switch.block_tx = true;
 494                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 495                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 496                 }
 497                 ch_switch.channel = new_ch;
 498                 ch_switch.count = sw_elem->count;
 499                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 500                 drv_channel_switch(sdata->local, &ch_switch);
 501                 return;
 502         }
 503
 504         /* channel switch handled in software */
 505         if (sw_elem->count <= 1) {
 506                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 507         } else {
 508                 if (sw_elem->mode)
 509                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 510                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 511                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 512                 mod_timer(&ifmgd->chswitch_timer,
 513                           jiffies +
 514                           msecs_to_jiffies(sw_elem->count *
 515                                            cbss->beacon_interval));
 516         }
 517 }
 518
 519 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 520                                         u16 capab_info, u8 *pwr_constr_elem,
 521                                         u8 pwr_constr_elem_len)
 522 {
 523         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 524
 525         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 526                 return;
 527
 528         /* Power constraint IE length should be 1 octet */
 529         if (pwr_constr_elem_len != 1)
 530                 return;
 531
 532         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 533             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 534                 sdata->local->power_constr_level = *pwr_constr_elem;
 535                 ieee80211_hw_config(sdata->local, 0);
 536         }
 537 }
 538
 539 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 540 {
 541         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 542         struct ieee80211_local *local = sdata->local;
 543         struct ieee80211_conf *conf = &local->hw.conf;
 544
 545         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 546                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 547                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 548
 549         local->disable_dynamic_ps = false;
 550         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 551 }
 552 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 553
 554 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 555 {
 556         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 557         struct ieee80211_local *local = sdata->local;
 558         struct ieee80211_conf *conf = &local->hw.conf;
 559
 560         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 561                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 562                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 563
 564         local->disable_dynamic_ps = true;
 565         conf->dynamic_ps_timeout = 0;
 566         del_timer_sync(&local->dynamic_ps_timer);
 567         ieee80211_queue_work(&local->hw,
 568                              &local->dynamic_ps_enable_work);
 569 }
 570 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 571
 572 /* powersave */
 573 static void ieee80211_enable_ps(struct ieee80211_local *local,
 574                                 struct ieee80211_sub_if_data *sdata)
 575 {
 576         struct ieee80211_conf *conf = &local->hw.conf;
 577
 578         /*
 579          * If we are scanning right now then the parameters will
 580          * take effect when scan finishes.
 581          */
 582         if (local->scanning)
 583                 return;
 584
 585         if (conf->dynamic_ps_timeout > 0 &&
 586             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 587                 mod_timer(&local->dynamic_ps_timer, jiffies +
 588                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 589         } else {
 590                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 591                         ieee80211_send_nullfunc(local, sdata, 1);
 592
 593                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 594                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 595                         return;
 596
 597                 conf->flags |= IEEE80211_CONF_PS;
 598                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 599         }
 600 }
 601
 602 static void ieee80211_change_ps(struct ieee80211_local *local)
 603 {
 604         struct ieee80211_conf *conf = &local->hw.conf;
 605
 606         if (local->ps_sdata) {
 607                 ieee80211_enable_ps(local, local->ps_sdata);
 608         } else if (conf->flags & IEEE80211_CONF_PS) {
 609                 conf->flags &= ~IEEE80211_CONF_PS;
 610                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 611                 del_timer_sync(&local->dynamic_ps_timer);
 612                 cancel_work_sync(&local->dynamic_ps_enable_work);
 613         }
 614 }
 615
 616 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 617 {
 618         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 619         struct sta_info *sta = NULL;
 620         u32 sta_flags = 0;
 621
 622         if (!mgd->powersave)
 623                 return false;
 624
 625         if (!mgd->associated)
 626                 return false;
 627
 628         if (!mgd->associated->beacon_ies)
 629                 return false;
 630
 631         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 632                           IEEE80211_STA_CONNECTION_POLL))
 633                 return false;
 634
 635         rcu_read_lock();
 636         sta = sta_info_get(sdata, mgd->bssid);
 637         if (sta)
 638                 sta_flags = get_sta_flags(sta);
 639         rcu_read_unlock();
 640
 641         if (!(sta_flags & WLAN_STA_AUTHORIZED))
 642                 return false;
 643
 644         return true;
 645 }
 646
 647 /* need to hold RTNL or interface lock */
 648 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 649 {
 650         struct ieee80211_sub_if_data *sdata, *found = NULL;
 651         int count = 0;
 652         int timeout;
 653
 654         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 655                 local->ps_sdata = NULL;
 656                 return;
 657         }
 658
 659         if (!list_empty(&local->work_list)) {
 660                 local->ps_sdata = NULL;
 661                 goto change;
 662         }
 663
 664         list_for_each_entry(sdata, &local->interfaces, list) {
 665                 if (!ieee80211_sdata_running(sdata))
 666                         continue;
 667                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 668                         /* If an AP vif is found, then disable PS
 669                          * by setting the count to zero thereby setting
 670                          * ps_sdata to NULL.
 671                          */
 672                         count = 0;
 673                         break;
 674                 }
 675                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 676                         continue;
 677                 found = sdata;
 678                 count++;
 679         }
 680
 681         if (count == 1 && ieee80211_powersave_allowed(found)) {
 682                 struct ieee80211_conf *conf = &local->hw.conf;
 683                 s32 beaconint_us;
 684
 685                 if (latency < 0)
 686                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 687
 688                 beaconint_us = ieee80211_tu_to_usec(
 689                                         found->vif.bss_conf.beacon_int);
 690
 691                 timeout = local->dynamic_ps_forced_timeout;
 692                 if (timeout < 0) {
 693                         /*
 694                          * Go to full PSM if the user configures a very low
 695                          * latency requirement.
 696                          * The 2000 second value is there for compatibility
 697                          * until the PM_QOS_NETWORK_LATENCY is configured
 698                          * with real values.
 699                          */
 700                         if (latency > (1900 * USEC_PER_MSEC) &&
 701                             latency != (2000 * USEC_PER_SEC))
 702                                 timeout = 0;
 703                         else
 704                                 timeout = 100;
 705                 }
 706                 local->dynamic_ps_user_timeout = timeout;
 707                 if (!local->disable_dynamic_ps)
 708                         conf->dynamic_ps_timeout =
 709                                 local->dynamic_ps_user_timeout;
 710
 711                 if (beaconint_us > latency) {
 712                         local->ps_sdata = NULL;
 713                 } else {
 714                         struct ieee80211_bss *bss;
 715                         int maxslp = 1;
 716                         u8 dtimper;
 717
 718                         bss = (void *)found->u.mgd.associated->priv;
 719                         dtimper = bss->dtim_period;
 720
 721                         /* If the TIM IE is invalid, pretend the value is 1 */
 722                         if (!dtimper)
 723                                 dtimper = 1;
 724                         else if (dtimper > 1)
 725                                 maxslp = min_t(int, dtimper,
 726                                                     latency / beaconint_us);
 727
 728                         local->hw.conf.max_sleep_period = maxslp;
 729                         local->hw.conf.ps_dtim_period = dtimper;
 730                         local->ps_sdata = found;
 731                 }
 732         } else {
 733                 local->ps_sdata = NULL;
 734         }
 735
 736  change:
 737         ieee80211_change_ps(local);
 738 }
 739
 740 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 741 {
 742         struct ieee80211_local *local =
 743                 container_of(work, struct ieee80211_local,
 744                              dynamic_ps_disable_work);
 745
 746         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 747                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 748                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 749         }
 750
 751         ieee80211_wake_queues_by_reason(&local->hw,
 752                                         IEEE80211_QUEUE_STOP_REASON_PS);
 753 }
 754
 755 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 756 {
 757         struct ieee80211_local *local =
 758                 container_of(work, struct ieee80211_local,
 759                              dynamic_ps_enable_work);
 760         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 761         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 762
 763         /* can only happen when PS was just disabled anyway */
 764         if (!sdata)
 765                 return;
 766
 767         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 768                 return;
 769
 770         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 771             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
 772                 netif_tx_stop_all_queues(sdata->dev);
 773                 /*
 774                  * Flush all the frames queued in the driver before
 775                  * going to power save
 776                  */
 777                 drv_flush(local, false);
 778                 ieee80211_send_nullfunc(local, sdata, 1);
 779
 780                 /* Flush once again to get the tx status of nullfunc frame */
 781                 drv_flush(local, false);
 782         }
 783
 784         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 785               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 786             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 787                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 788                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 789                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 790         }
 791
 792         netif_tx_start_all_queues(sdata->dev);
 793 }
 794
 795 void ieee80211_dynamic_ps_timer(unsigned long data)
 796 {
 797         struct ieee80211_local *local = (void *) data;
 798
 799         if (local->quiescing || local->suspended)
 800                 return;
 801
 802         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 803 }
 804
 805 /* MLME */
 806 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 807                                      struct ieee80211_sub_if_data *sdata,
 808                                      u8 *wmm_param, size_t wmm_param_len)
 809 {
 810         struct ieee80211_tx_queue_params params;
 811         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 812         size_t left;
 813         int count;
 814         u8 *pos, uapsd_queues = 0;
 815
 816         if (!local->ops->conf_tx)
 817                 return;
 818
 819         if (local->hw.queues < 4)
 820                 return;
 821
 822         if (!wmm_param)
 823                 return;
 824
 825         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 826                 return;
 827
 828         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 829                 uapsd_queues = local->uapsd_queues;
 830
 831         count = wmm_param[6] & 0x0f;
 832         if (count == ifmgd->wmm_last_param_set)
 833                 return;
 834         ifmgd->wmm_last_param_set = count;
 835
 836         pos = wmm_param + 8;
 837         left = wmm_param_len - 8;
 838
 839         memset(&params, 0, sizeof(params));
 840
 841         local->wmm_acm = 0;
 842         for (; left >= 4; left -= 4, pos += 4) {
 843                 int aci = (pos[0] >> 5) & 0x03;
 844                 int acm = (pos[0] >> 4) & 0x01;
 845                 bool uapsd = false;
 846                 int queue;
 847
 848                 switch (aci) {
 849                 case 1: /* AC_BK */
 850                         queue = 3;
 851                         if (acm)
 852                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 853                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 854                                 uapsd = true;
 855                         break;
 856                 case 2: /* AC_VI */
 857                         queue = 1;
 858                         if (acm)
 859                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 860                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 861                                 uapsd = true;
 862                         break;
 863                 case 3: /* AC_VO */
 864                         queue = 0;
 865                         if (acm)
 866                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 867                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 868                                 uapsd = true;
 869                         break;
 870                 case 0: /* AC_BE */
 871                 default:
 872                         queue = 2;
 873                         if (acm)
 874                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 875                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 876                                 uapsd = true;
 877                         break;
 878                 }
 879
 880                 params.aifs = pos[0] & 0x0f;
 881                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 882                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 883                 params.txop = get_unaligned_le16(pos + 2);
 884                 params.uapsd = uapsd;
 885
 886 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 887                 wiphy_debug(local->hw.wiphy,
 888                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 889                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 890                             queue, aci, acm,
 891                             params.aifs, params.cw_min, params.cw_max,
 892                             params.txop, params.uapsd);
 893 #endif
 894                 if (drv_conf_tx(local, queue, &params))
 895                         wiphy_debug(local->hw.wiphy,
 896                                     "failed to set TX queue parameters for queue %d\n",
 897                                     queue);
 898         }
 899
 900         /* enable WMM or activate new settings */
 901         sdata->vif.bss_conf.qos = true;
 902         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 903 }
 904
 905 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 906                                            u16 capab, bool erp_valid, u8 erp)
 907 {
 908         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 909         u32 changed = 0;
 910         bool use_protection;
 911         bool use_short_preamble;
 912         bool use_short_slot;
 913
 914         if (erp_valid) {
 915                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 916                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 917         } else {
 918                 use_protection = false;
 919                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 920         }
 921
 922         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 923         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 924                 use_short_slot = true;
 925
 926         if (use_protection != bss_conf->use_cts_prot) {
 927                 bss_conf->use_cts_prot = use_protection;
 928                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 929         }
 930
 931         if (use_short_preamble != bss_conf->use_short_preamble) {
 932                 bss_conf->use_short_preamble = use_short_preamble;
 933                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 934         }
 935
 936         if (use_short_slot != bss_conf->use_short_slot) {
 937                 bss_conf->use_short_slot = use_short_slot;
 938                 changed |= BSS_CHANGED_ERP_SLOT;
 939         }
 940
 941         return changed;
 942 }
 943
 944 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 945                                      struct cfg80211_bss *cbss,
 946                                      u32 bss_info_changed)
 947 {
 948         struct ieee80211_bss *bss = (void *)cbss->priv;
 949         struct ieee80211_local *local = sdata->local;
 950         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 951
 952         bss_info_changed |= BSS_CHANGED_ASSOC;
 953         /* set timing information */
 954         bss_conf->beacon_int = cbss->beacon_interval;
 955         bss_conf->timestamp = cbss->tsf;
 956
 957         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 958         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 959                 cbss->capability, bss->has_erp_value, bss->erp_value);
 960
 961         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
 962                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
 963
 964         sdata->u.mgd.associated = cbss;
 965         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 966
 967         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 968
 969         /* just to be sure */
 970         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 971                                 IEEE80211_STA_BEACON_POLL);
 972
 973         ieee80211_led_assoc(local, 1);
 974
 975         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 976                 bss_conf->dtim_period = bss->dtim_period;
 977         else
 978                 bss_conf->dtim_period = 0;
 979
 980         bss_conf->assoc = 1;
 981         /*
 982          * For now just always ask the driver to update the basic rateset
 983          * when we have associated, we aren't checking whether it actually
 984          * changed or not.
 985          */
 986         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 987
 988         /* And the BSSID changed - we're associated now */
 989         bss_info_changed |= BSS_CHANGED_BSSID;
 990
 991         /* Tell the driver to monitor connection quality (if supported) */
 992         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
 993             bss_conf->cqm_rssi_thold)
 994                 bss_info_changed |= BSS_CHANGED_CQM;
 995
 996         /* Enable ARP filtering */
 997         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
 998                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 999                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1000         }
1001
1002         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1003
1004         mutex_lock(&local->iflist_mtx);
1005         ieee80211_recalc_ps(local, -1);
1006         ieee80211_recalc_smps(local);
1007         mutex_unlock(&local->iflist_mtx);
1008
1009         netif_tx_start_all_queues(sdata->dev);
1010         netif_carrier_on(sdata->dev);
1011 }
1012
1013 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1014                                    bool remove_sta, bool tx)
1015 {
1016         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1017         struct ieee80211_local *local = sdata->local;
1018         struct sta_info *sta;
1019         u32 changed = 0, config_changed = 0;
1020         u8 bssid[ETH_ALEN];
1021
1022         ASSERT_MGD_MTX(ifmgd);
1023
1024         if (WARN_ON(!ifmgd->associated))
1025                 return;
1026
1027         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1028
1029         ifmgd->associated = NULL;
1030         memset(ifmgd->bssid, 0, ETH_ALEN);
1031
1032         /*
1033          * we need to commit the associated = NULL change because the
1034          * scan code uses that to determine whether this iface should
1035          * go to/wake up from powersave or not -- and could otherwise
1036          * wake the queues erroneously.
1037          */
1038         smp_mb();
1039
1040         /*
1041          * Thus, we can only afterwards stop the queues -- to account
1042          * for the case where another CPU is finishing a scan at this
1043          * time -- we don't want the scan code to enable queues.
1044          */
1045
1046         netif_tx_stop_all_queues(sdata->dev);
1047         netif_carrier_off(sdata->dev);
1048
1049         mutex_lock(&local->sta_mtx);
1050         sta = sta_info_get(sdata, bssid);
1051         if (sta) {
1052                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1053                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1054         }
1055         mutex_unlock(&local->sta_mtx);
1056
1057         changed |= ieee80211_reset_erp_info(sdata);
1058
1059         ieee80211_led_assoc(local, 0);
1060         changed |= BSS_CHANGED_ASSOC;
1061         sdata->vif.bss_conf.assoc = false;
1062
1063         ieee80211_set_wmm_default(sdata);
1064
1065         /* channel(_type) changes are handled by ieee80211_hw_config */
1066         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1067
1068         /* on the next assoc, re-program HT parameters */
1069         sdata->ht_opmode_valid = false;
1070
1071         local->power_constr_level = 0;
1072
1073         del_timer_sync(&local->dynamic_ps_timer);
1074         cancel_work_sync(&local->dynamic_ps_enable_work);
1075
1076         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1077                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1078                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1079         }
1080
1081         ieee80211_hw_config(local, config_changed);
1082
1083         /* Disable ARP filtering */
1084         if (sdata->vif.bss_conf.arp_filter_enabled) {
1085                 sdata->vif.bss_conf.arp_filter_enabled = false;
1086                 changed |= BSS_CHANGED_ARP_FILTER;
1087         }
1088
1089         /* The BSSID (not really interesting) and HT changed */
1090         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1091         ieee80211_bss_info_change_notify(sdata, changed);
1092
1093         if (remove_sta)
1094                 sta_info_destroy_addr(sdata, bssid);
1095
1096         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1097         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1098         del_timer_sync(&sdata->u.mgd.timer);
1099         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1100 }
1101
1102 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1103                              struct ieee80211_hdr *hdr)
1104 {
1105         /*
1106          * We can postpone the mgd.timer whenever receiving unicast frames
1107          * from AP because we know that the connection is working both ways
1108          * at that time. But multicast frames (and hence also beacons) must
1109          * be ignored here, because we need to trigger the timer during
1110          * data idle periods for sending the periodic probe request to the
1111          * AP we're connected to.
1112          */
1113         if (is_multicast_ether_addr(hdr->addr1))
1114                 return;
1115
1116         ieee80211_sta_reset_conn_monitor(sdata);
1117 }
1118
1119 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1120 {
1121         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1122
1123         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1124                               IEEE80211_STA_CONNECTION_POLL)))
1125             return;
1126
1127         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1128                           IEEE80211_STA_BEACON_POLL);
1129         mutex_lock(&sdata->local->iflist_mtx);
1130         ieee80211_recalc_ps(sdata->local, -1);
1131         mutex_unlock(&sdata->local->iflist_mtx);
1132
1133         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1134                 return;
1135
1136         /*
1137          * We've received a probe response, but are not sure whether
1138          * we have or will be receiving any beacons or data, so let's
1139          * schedule the timers again, just in case.
1140          */
1141         ieee80211_sta_reset_beacon_monitor(sdata);
1142
1143         mod_timer(&ifmgd->conn_mon_timer,
1144                   round_jiffies_up(jiffies +
1145                                    IEEE80211_CONNECTION_IDLE_TIME));
1146 }
1147
1148 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1149                              struct ieee80211_hdr *hdr, bool ack)
1150 {
1151         if (!ieee80211_is_data(hdr->frame_control))
1152             return;
1153
1154         if (ack)
1155                 ieee80211_sta_reset_conn_monitor(sdata);
1156
1157         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1158             sdata->u.mgd.probe_send_count > 0) {
1159                 if (ack)
1160                         sdata->u.mgd.probe_send_count = 0;
1161                 else
1162                         sdata->u.mgd.nullfunc_failed = true;
1163                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1164         }
1165 }
1166
1167 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1168 {
1169         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1170         const u8 *ssid;
1171         u8 *dst = ifmgd->associated->bssid;
1172         u8 unicast_limit = max(1, max_probe_tries - 3);
1173
1174         /*
1175          * Try sending broadcast probe requests for the last three
1176          * probe requests after the first ones failed since some
1177          * buggy APs only support broadcast probe requests.
1178          */
1179         if (ifmgd->probe_send_count >= unicast_limit)
1180                 dst = NULL;
1181
1182         /*
1183          * When the hardware reports an accurate Tx ACK status, it's
1184          * better to send a nullfunc frame instead of a probe request,
1185          * as it will kick us off the AP quickly if we aren't associated
1186          * anymore. The timeout will be reset if the frame is ACKed by
1187          * the AP.
1188          */
1189         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1190                 ifmgd->nullfunc_failed = false;
1191                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1192         } else {
1193                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1194                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1195         }
1196
1197         ifmgd->probe_send_count++;
1198         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1199         run_again(ifmgd, ifmgd->probe_timeout);
1200 }
1201
1202 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1203                                    bool beacon)
1204 {
1205         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1206         bool already = false;
1207
1208         if (!ieee80211_sdata_running(sdata))
1209                 return;
1210
1211         if (sdata->local->scanning)
1212                 return;
1213
1214         if (sdata->local->tmp_channel)
1215                 return;
1216
1217         mutex_lock(&ifmgd->mtx);
1218
1219         if (!ifmgd->associated)
1220                 goto out;
1221
1222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1223         if (beacon && net_ratelimit())
1224                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1225                        "- sending probe request\n", sdata->name);
1226 #endif
1227
1228         /*
1229          * The driver/our work has already reported this event or the
1230          * connection monitoring has kicked in and we have already sent
1231          * a probe request. Or maybe the AP died and the driver keeps
1232          * reporting until we disassociate...
1233          *
1234          * In either case we have to ignore the current call to this
1235          * function (except for setting the correct probe reason bit)
1236          * because otherwise we would reset the timer every time and
1237          * never check whether we received a probe response!
1238          */
1239         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1240                             IEEE80211_STA_CONNECTION_POLL))
1241                 already = true;
1242
1243         if (beacon)
1244                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1245         else
1246                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1247
1248         if (already)
1249                 goto out;
1250
1251         mutex_lock(&sdata->local->iflist_mtx);
1252         ieee80211_recalc_ps(sdata->local, -1);
1253         mutex_unlock(&sdata->local->iflist_mtx);
1254
1255         ifmgd->probe_send_count = 0;
1256         ieee80211_mgd_probe_ap_send(sdata);
1257  out:
1258         mutex_unlock(&ifmgd->mtx);
1259 }
1260
1261 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1262                                           struct ieee80211_vif *vif)
1263 {
1264         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1265         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1266         struct sk_buff *skb;
1267         const u8 *ssid;
1268
1269         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1270                 return NULL;
1271
1272         ASSERT_MGD_MTX(ifmgd);
1273
1274         if (!ifmgd->associated)
1275                 return NULL;
1276
1277         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1278         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1279                                         ssid + 2, ssid[1], NULL, 0);
1280
1281         return skb;
1282 }
1283 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1284
1285 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1286 {
1287         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1288         struct ieee80211_local *local = sdata->local;
1289         u8 bssid[ETH_ALEN];
1290
1291         mutex_lock(&ifmgd->mtx);
1292         if (!ifmgd->associated) {
1293                 mutex_unlock(&ifmgd->mtx);
1294                 return;
1295         }
1296
1297         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1298
1299         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1300                sdata->name, bssid);
1301
1302         ieee80211_set_disassoc(sdata, true, true);
1303         mutex_unlock(&ifmgd->mtx);
1304
1305         mutex_lock(&local->mtx);
1306         ieee80211_recalc_idle(local);
1307         mutex_unlock(&local->mtx);
1308         /*
1309          * must be outside lock due to cfg80211,
1310          * but that's not a problem.
1311          */
1312         ieee80211_send_deauth_disassoc(sdata, bssid,
1313                                        IEEE80211_STYPE_DEAUTH,
1314                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1315                                        NULL, true);
1316 }
1317
1318 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1319 {
1320         struct ieee80211_sub_if_data *sdata =
1321                 container_of(work, struct ieee80211_sub_if_data,
1322                              u.mgd.beacon_connection_loss_work);
1323
1324         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1325                 __ieee80211_connection_loss(sdata);
1326         else
1327                 ieee80211_mgd_probe_ap(sdata, true);
1328 }
1329
1330 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1331 {
1332         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1333         struct ieee80211_hw *hw = &sdata->local->hw;
1334
1335         trace_api_beacon_loss(sdata);
1336
1337         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1338         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1339 }
1340 EXPORT_SYMBOL(ieee80211_beacon_loss);
1341
1342 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1343 {
1344         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1345         struct ieee80211_hw *hw = &sdata->local->hw;
1346
1347         trace_api_connection_loss(sdata);
1348
1349         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1350         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1351 }
1352 EXPORT_SYMBOL(ieee80211_connection_loss);
1353
1354
1355 static enum rx_mgmt_action __must_check
1356 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1357                          struct ieee80211_mgmt *mgmt, size_t len)
1358 {
1359         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1360         const u8 *bssid = NULL;
1361         u16 reason_code;
1362
1363         if (len < 24 + 2)
1364                 return RX_MGMT_NONE;
1365
1366         ASSERT_MGD_MTX(ifmgd);
1367
1368         bssid = ifmgd->associated->bssid;
1369
1370         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1371
1372         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1373                         sdata->name, bssid, reason_code);
1374
1375         ieee80211_set_disassoc(sdata, true, false);
1376         mutex_lock(&sdata->local->mtx);
1377         ieee80211_recalc_idle(sdata->local);
1378         mutex_unlock(&sdata->local->mtx);
1379
1380         return RX_MGMT_CFG80211_DEAUTH;
1381 }
1382
1383
1384 static enum rx_mgmt_action __must_check
1385 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1386                            struct ieee80211_mgmt *mgmt, size_t len)
1387 {
1388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1389         u16 reason_code;
1390
1391         if (len < 24 + 2)
1392                 return RX_MGMT_NONE;
1393
1394         ASSERT_MGD_MTX(ifmgd);
1395
1396         if (WARN_ON(!ifmgd->associated))
1397                 return RX_MGMT_NONE;
1398
1399         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1400                 return RX_MGMT_NONE;
1401
1402         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1403
1404         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1405                         sdata->name, mgmt->sa, reason_code);
1406
1407         ieee80211_set_disassoc(sdata, true, false);
1408         mutex_lock(&sdata->local->mtx);
1409         ieee80211_recalc_idle(sdata->local);
1410         mutex_unlock(&sdata->local->mtx);
1411         return RX_MGMT_CFG80211_DISASSOC;
1412 }
1413
1414
1415 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1416                                     struct ieee80211_mgmt *mgmt, size_t len)
1417 {
1418         struct ieee80211_sub_if_data *sdata = wk->sdata;
1419         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1420         struct ieee80211_local *local = sdata->local;
1421         struct ieee80211_supported_band *sband;
1422         struct sta_info *sta;
1423         struct cfg80211_bss *cbss = wk->assoc.bss;
1424         u8 *pos;
1425         u32 rates, basic_rates;
1426         u16 capab_info, aid;
1427         struct ieee802_11_elems elems;
1428         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1429         u32 changed = 0;
1430         int i, j, err;
1431         bool have_higher_than_11mbit = false;
1432         u16 ap_ht_cap_flags;
1433
1434         /* AssocResp and ReassocResp have identical structure */
1435
1436         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1437         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1438
1439         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1440                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1441                        "set\n", sdata->name, aid);
1442         aid &= ~(BIT(15) | BIT(14));
1443
1444         pos = mgmt->u.assoc_resp.variable;
1445         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1446
1447         if (!elems.supp_rates) {
1448                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1449                        sdata->name);
1450                 return false;
1451         }
1452
1453         ifmgd->aid = aid;
1454
1455         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1456         if (!sta) {
1457                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1458                        " the AP\n", sdata->name);
1459                 return false;
1460         }
1461
1462         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1463                            WLAN_STA_ASSOC_AP);
1464         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1465                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1466
1467         rates = 0;
1468         basic_rates = 0;
1469         sband = local->hw.wiphy->bands[wk->chan->band];
1470
1471         for (i = 0; i < elems.supp_rates_len; i++) {
1472                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1473                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1474
1475                 if (rate > 110)
1476                         have_higher_than_11mbit = true;
1477
1478                 for (j = 0; j < sband->n_bitrates; j++) {
1479                         if (sband->bitrates[j].bitrate == rate) {
1480                                 rates |= BIT(j);
1481                                 if (is_basic)
1482                                         basic_rates |= BIT(j);
1483                                 break;
1484                         }
1485                 }
1486         }
1487
1488         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1489                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1490                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1491
1492                 if (rate > 110)
1493                         have_higher_than_11mbit = true;
1494
1495                 for (j = 0; j < sband->n_bitrates; j++) {
1496                         if (sband->bitrates[j].bitrate == rate) {
1497                                 rates |= BIT(j);
1498                                 if (is_basic)
1499                                         basic_rates |= BIT(j);
1500                                 break;
1501                         }
1502                 }
1503         }
1504
1505         sta->sta.supp_rates[wk->chan->band] = rates;
1506         sdata->vif.bss_conf.basic_rates = basic_rates;
1507
1508         /* cf. IEEE 802.11 9.2.12 */
1509         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1510             have_higher_than_11mbit)
1511                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1512         else
1513                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1514
1515         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1516                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1517                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1518
1519         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1520
1521         rate_control_rate_init(sta);
1522
1523         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1524                 set_sta_flags(sta, WLAN_STA_MFP);
1525
1526         if (elems.wmm_param)
1527                 set_sta_flags(sta, WLAN_STA_WME);
1528
1529         err = sta_info_insert(sta);
1530         sta = NULL;
1531         if (err) {
1532                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1533                        " the AP (error %d)\n", sdata->name, err);
1534                 return false;
1535         }
1536
1537         /*
1538          * Always handle WMM once after association regardless
1539          * of the first value the AP uses. Setting -1 here has
1540          * that effect because the AP values is an unsigned
1541          * 4-bit value.
1542          */
1543         ifmgd->wmm_last_param_set = -1;
1544
1545         if (elems.wmm_param)
1546                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1547                                          elems.wmm_param_len);
1548         else
1549                 ieee80211_set_wmm_default(sdata);
1550
1551         local->oper_channel = wk->chan;
1552
1553         if (elems.ht_info_elem && elems.wmm_param &&
1554             (sdata->local->hw.queues >= 4) &&
1555             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1556                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1557                                                cbss->bssid, ap_ht_cap_flags);
1558
1559         /* set AID and assoc capability,
1560          * ieee80211_set_associated() will tell the driver */
1561         bss_conf->aid = aid;
1562         bss_conf->assoc_capability = capab_info;
1563         ieee80211_set_associated(sdata, cbss, changed);
1564
1565         /*
1566          * If we're using 4-addr mode, let the AP know that we're
1567          * doing so, so that it can create the STA VLAN on its side
1568          */
1569         if (ifmgd->use_4addr)
1570                 ieee80211_send_4addr_nullfunc(local, sdata);
1571
1572         /*
1573          * Start timer to probe the connection to the AP now.
1574          * Also start the timer that will detect beacon loss.
1575          */
1576         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1577         ieee80211_sta_reset_beacon_monitor(sdata);
1578
1579         return true;
1580 }
1581
1582
1583 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1584                                   struct ieee80211_mgmt *mgmt,
1585                                   size_t len,
1586                                   struct ieee80211_rx_status *rx_status,
1587                                   struct ieee802_11_elems *elems,
1588                                   bool beacon)
1589 {
1590         struct ieee80211_local *local = sdata->local;
1591         int freq;
1592         struct ieee80211_bss *bss;
1593         struct ieee80211_channel *channel;
1594         bool need_ps = false;
1595
1596         if (sdata->u.mgd.associated) {
1597                 bss = (void *)sdata->u.mgd.associated->priv;
1598                 /* not previously set so we may need to recalc */
1599                 need_ps = !bss->dtim_period;
1600         }
1601
1602         if (elems->ds_params && elems->ds_params_len == 1)
1603                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1604                                                       rx_status->band);
1605         else
1606                 freq = rx_status->freq;
1607
1608         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1609
1610         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1611                 return;
1612
1613         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1614                                         channel, beacon);
1615         if (bss)
1616                 ieee80211_rx_bss_put(local, bss);
1617
1618         if (!sdata->u.mgd.associated)
1619                 return;
1620
1621         if (need_ps) {
1622                 mutex_lock(&local->iflist_mtx);
1623                 ieee80211_recalc_ps(local, -1);
1624                 mutex_unlock(&local->iflist_mtx);
1625         }
1626
1627         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1628             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1629                                                         ETH_ALEN) == 0)) {
1630                 struct ieee80211_channel_sw_ie *sw_elem =
1631                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1632                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1633                                                  bss, rx_status->mactime);
1634         }
1635 }
1636
1637
1638 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1639                                          struct sk_buff *skb)
1640 {
1641         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1642         struct ieee80211_if_managed *ifmgd;
1643         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1644         size_t baselen, len = skb->len;
1645         struct ieee802_11_elems elems;
1646
1647         ifmgd = &sdata->u.mgd;
1648
1649         ASSERT_MGD_MTX(ifmgd);
1650
1651         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1652                 return; /* ignore ProbeResp to foreign address */
1653
1654         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1655         if (baselen > len)
1656                 return;
1657
1658         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1659                                 &elems);
1660
1661         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1662
1663         if (ifmgd->associated &&
1664             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1665                 ieee80211_reset_ap_probe(sdata);
1666 }
1667
1668 /*
1669  * This is the canonical list of information elements we care about,
1670  * the filter code also gives us all changes to the Microsoft OUI
1671  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1672  *
1673  * We implement beacon filtering in software since that means we can
1674  * avoid processing the frame here and in cfg80211, and userspace
1675  * will not be able to tell whether the hardware supports it or not.
1676  *
1677  * XXX: This list needs to be dynamic -- userspace needs to be able to
1678  *      add items it requires. It also needs to be able to tell us to
1679  *      look out for other vendor IEs.
1680  */
1681 static const u64 care_about_ies =
1682         (1ULL << WLAN_EID_COUNTRY) |
1683         (1ULL << WLAN_EID_ERP_INFO) |
1684         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1685         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1686         (1ULL << WLAN_EID_HT_CAPABILITY) |
1687         (1ULL << WLAN_EID_HT_INFORMATION);
1688
1689 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1690                                      struct ieee80211_mgmt *mgmt,
1691                                      size_t len,
1692                                      struct ieee80211_rx_status *rx_status)
1693 {
1694         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1695         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1696         size_t baselen;
1697         struct ieee802_11_elems elems;
1698         struct ieee80211_local *local = sdata->local;
1699         u32 changed = 0;
1700         bool erp_valid, directed_tim = false;
1701         u8 erp_value = 0;
1702         u32 ncrc;
1703         u8 *bssid;
1704
1705         ASSERT_MGD_MTX(ifmgd);
1706
1707         /* Process beacon from the current BSS */
1708         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1709         if (baselen > len)
1710                 return;
1711
1712         if (rx_status->freq != local->hw.conf.channel->center_freq)
1713                 return;
1714
1715         /*
1716          * We might have received a number of frames, among them a
1717          * disassoc frame and a beacon...
1718          */
1719         if (!ifmgd->associated)
1720                 return;
1721
1722         bssid = ifmgd->associated->bssid;
1723
1724         /*
1725          * And in theory even frames from a different AP we were just
1726          * associated to a split-second ago!
1727          */
1728         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1729                 return;
1730
1731         /* Track average RSSI from the Beacon frames of the current AP */
1732         ifmgd->last_beacon_signal = rx_status->signal;
1733         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1734                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1735                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1736                 ifmgd->last_cqm_event_signal = 0;
1737                 ifmgd->count_beacon_signal = 1;
1738         } else {
1739                 ifmgd->ave_beacon_signal =
1740                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1741                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1742                          ifmgd->ave_beacon_signal) / 16;
1743                 ifmgd->count_beacon_signal++;
1744         }
1745         if (bss_conf->cqm_rssi_thold &&
1746             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1747             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1748                 int sig = ifmgd->ave_beacon_signal / 16;
1749                 int last_event = ifmgd->last_cqm_event_signal;
1750                 int thold = bss_conf->cqm_rssi_thold;
1751                 int hyst = bss_conf->cqm_rssi_hyst;
1752                 if (sig < thold &&
1753                     (last_event == 0 || sig < last_event - hyst)) {
1754                         ifmgd->last_cqm_event_signal = sig;
1755                         ieee80211_cqm_rssi_notify(
1756                                 &sdata->vif,
1757                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1758                                 GFP_KERNEL);
1759                 } else if (sig > thold &&
1760                            (last_event == 0 || sig > last_event + hyst)) {
1761                         ifmgd->last_cqm_event_signal = sig;
1762                         ieee80211_cqm_rssi_notify(
1763                                 &sdata->vif,
1764                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1765                                 GFP_KERNEL);
1766                 }
1767         }
1768
1769         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1770 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1771                 if (net_ratelimit()) {
1772                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1773                                "to a received beacon\n", sdata->name);
1774                 }
1775 #endif
1776                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1777                 mutex_lock(&local->iflist_mtx);
1778                 ieee80211_recalc_ps(local, -1);
1779                 mutex_unlock(&local->iflist_mtx);
1780         }
1781
1782         /*
1783          * Push the beacon loss detection into the future since
1784          * we are processing a beacon from the AP just now.
1785          */
1786         ieee80211_sta_reset_beacon_monitor(sdata);
1787
1788         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1789         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1790                                           len - baselen, &elems,
1791                                           care_about_ies, ncrc);
1792
1793         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1794                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1795                                                    ifmgd->aid);
1796
1797         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1798                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1799                                       true);
1800
1801                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1802                                          elems.wmm_param_len);
1803         }
1804
1805         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1806                 if (directed_tim) {
1807                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1808                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1809                                 ieee80211_hw_config(local,
1810                                                     IEEE80211_CONF_CHANGE_PS);
1811                                 ieee80211_send_nullfunc(local, sdata, 0);
1812                         } else {
1813                                 local->pspolling = true;
1814
1815                                 /*
1816                                  * Here is assumed that the driver will be
1817                                  * able to send ps-poll frame and receive a
1818                                  * response even though power save mode is
1819                                  * enabled, but some drivers might require
1820                                  * to disable power save here. This needs
1821                                  * to be investigated.
1822                                  */
1823                                 ieee80211_send_pspoll(local, sdata);
1824                         }
1825                 }
1826         }
1827
1828         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1829                 return;
1830         ifmgd->beacon_crc = ncrc;
1831         ifmgd->beacon_crc_valid = true;
1832
1833         if (elems.erp_info && elems.erp_info_len >= 1) {
1834                 erp_valid = true;
1835                 erp_value = elems.erp_info[0];
1836         } else {
1837                 erp_valid = false;
1838         }
1839         changed |= ieee80211_handle_bss_capability(sdata,
1840                         le16_to_cpu(mgmt->u.beacon.capab_info),
1841                         erp_valid, erp_value);
1842
1843
1844         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1845             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1846                 struct sta_info *sta;
1847                 struct ieee80211_supported_band *sband;
1848                 u16 ap_ht_cap_flags;
1849
1850                 rcu_read_lock();
1851
1852                 sta = sta_info_get(sdata, bssid);
1853                 if (WARN_ON(!sta)) {
1854                         rcu_read_unlock();
1855                         return;
1856                 }
1857
1858                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1859
1860                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1861                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1862
1863                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1864
1865                 rcu_read_unlock();
1866
1867                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1868                                                bssid, ap_ht_cap_flags);
1869         }
1870
1871         /* Note: country IE parsing is done for us by cfg80211 */
1872         if (elems.country_elem) {
1873                 /* TODO: IBSS also needs this */
1874                 if (elems.pwr_constr_elem)
1875                         ieee80211_handle_pwr_constr(sdata,
1876                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1877                                 elems.pwr_constr_elem,
1878                                 elems.pwr_constr_elem_len);
1879         }
1880
1881         ieee80211_bss_info_change_notify(sdata, changed);
1882 }
1883
1884 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1885                                   struct sk_buff *skb)
1886 {
1887         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1888         struct ieee80211_rx_status *rx_status;
1889         struct ieee80211_mgmt *mgmt;
1890         enum rx_mgmt_action rma = RX_MGMT_NONE;
1891         u16 fc;
1892
1893         rx_status = (struct ieee80211_rx_status *) skb->cb;
1894         mgmt = (struct ieee80211_mgmt *) skb->data;
1895         fc = le16_to_cpu(mgmt->frame_control);
1896
1897         mutex_lock(&ifmgd->mtx);
1898
1899         if (ifmgd->associated &&
1900             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1901                 switch (fc & IEEE80211_FCTL_STYPE) {
1902                 case IEEE80211_STYPE_BEACON:
1903                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1904                                                  rx_status);
1905                         break;
1906                 case IEEE80211_STYPE_PROBE_RESP:
1907                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1908                         break;
1909                 case IEEE80211_STYPE_DEAUTH:
1910                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1911                         break;
1912                 case IEEE80211_STYPE_DISASSOC:
1913                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1914                         break;
1915                 case IEEE80211_STYPE_ACTION:
1916                         switch (mgmt->u.action.category) {
1917                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1918                                 ieee80211_sta_process_chanswitch(sdata,
1919                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1920                                                 (void *)ifmgd->associated->priv,
1921                                                 rx_status->mactime);
1922                                 break;
1923                         }
1924                 }
1925                 mutex_unlock(&ifmgd->mtx);
1926
1927                 switch (rma) {
1928                 case RX_MGMT_NONE:
1929                         /* no action */
1930                         break;
1931                 case RX_MGMT_CFG80211_DEAUTH:
1932                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1933                         break;
1934                 case RX_MGMT_CFG80211_DISASSOC:
1935                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1936                         break;
1937                 default:
1938                         WARN(1, "unexpected: %d", rma);
1939                 }
1940                 return;
1941         }
1942
1943         mutex_unlock(&ifmgd->mtx);
1944
1945         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1946             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1947                 struct ieee80211_local *local = sdata->local;
1948                 struct ieee80211_work *wk;
1949
1950                 mutex_lock(&local->mtx);
1951                 list_for_each_entry(wk, &local->work_list, list) {
1952                         if (wk->sdata != sdata)
1953                                 continue;
1954
1955                         if (wk->type != IEEE80211_WORK_ASSOC &&
1956                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1957                                 continue;
1958
1959                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1960                                 continue;
1961                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1962                                 continue;
1963
1964                         /*
1965                          * Printing the message only here means we can't
1966                          * spuriously print it, but it also means that it
1967                          * won't be printed when the frame comes in before
1968                          * we even tried to associate or in similar cases.
1969                          *
1970                          * Ultimately, I suspect cfg80211 should print the
1971                          * messages instead.
1972                          */
1973                         printk(KERN_DEBUG
1974                                "%s: deauthenticated from %pM (Reason: %u)\n",
1975                                sdata->name, mgmt->bssid,
1976                                le16_to_cpu(mgmt->u.deauth.reason_code));
1977
1978                         list_del_rcu(&wk->list);
1979                         free_work(wk);
1980                         break;
1981                 }
1982                 mutex_unlock(&local->mtx);
1983
1984                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1985         }
1986 }
1987
1988 static void ieee80211_sta_timer(unsigned long data)
1989 {
1990         struct ieee80211_sub_if_data *sdata =
1991                 (struct ieee80211_sub_if_data *) data;
1992         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1993         struct ieee80211_local *local = sdata->local;
1994
1995         if (local->quiescing) {
1996                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1997                 return;
1998         }
1999
2000         ieee80211_queue_work(&local->hw, &sdata->work);
2001 }
2002
2003 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2004                                           u8 *bssid)
2005 {
2006         struct ieee80211_local *local = sdata->local;
2007         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2008
2009         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2010                           IEEE80211_STA_BEACON_POLL);
2011
2012         ieee80211_set_disassoc(sdata, true, true);
2013         mutex_unlock(&ifmgd->mtx);
2014         mutex_lock(&local->mtx);
2015         ieee80211_recalc_idle(local);
2016         mutex_unlock(&local->mtx);
2017         /*
2018          * must be outside lock due to cfg80211,
2019          * but that's not a problem.
2020          */
2021         ieee80211_send_deauth_disassoc(sdata, bssid,
2022                         IEEE80211_STYPE_DEAUTH,
2023                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2024                         NULL, true);
2025         mutex_lock(&ifmgd->mtx);
2026 }
2027
2028 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2029 {
2030         struct ieee80211_local *local = sdata->local;
2031         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2032
2033         /* then process the rest of the work */
2034         mutex_lock(&ifmgd->mtx);
2035
2036         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2037                             IEEE80211_STA_CONNECTION_POLL) &&
2038             ifmgd->associated) {
2039                 u8 bssid[ETH_ALEN];
2040                 int max_tries;
2041
2042                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2043
2044                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2045                         max_tries = max_nullfunc_tries;
2046                 else
2047                         max_tries = max_probe_tries;
2048
2049                 /* ACK received for nullfunc probing frame */
2050                 if (!ifmgd->probe_send_count)
2051                         ieee80211_reset_ap_probe(sdata);
2052                 else if (ifmgd->nullfunc_failed) {
2053                         if (ifmgd->probe_send_count < max_tries) {
2054 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2055                                 wiphy_debug(local->hw.wiphy,
2056                                             "%s: No ack for nullfunc frame to"
2057                                             " AP %pM, try %d/%i\n",
2058                                             sdata->name, bssid,
2059                                             ifmgd->probe_send_count, max_tries);
2060 #endif
2061                                 ieee80211_mgd_probe_ap_send(sdata);
2062                         } else {
2063 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2064                                 wiphy_debug(local->hw.wiphy,
2065                                             "%s: No ack for nullfunc frame to"
2066                                             " AP %pM, disconnecting.\n",
2067                                             sdata->name, bssid);
2068 #endif
2069                                 ieee80211_sta_connection_lost(sdata, bssid);
2070                         }
2071                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2072                         run_again(ifmgd, ifmgd->probe_timeout);
2073                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2074 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2075                         wiphy_debug(local->hw.wiphy,
2076                                     "%s: Failed to send nullfunc to AP %pM"
2077                                     " after %dms, disconnecting.\n",
2078                                     sdata->name,
2079                                     bssid, probe_wait_ms);
2080 #endif
2081                         ieee80211_sta_connection_lost(sdata, bssid);
2082                 } else if (ifmgd->probe_send_count < max_tries) {
2083 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2084                         wiphy_debug(local->hw.wiphy,
2085                                     "%s: No probe response from AP %pM"
2086                                     " after %dms, try %d/%i\n",
2087                                     sdata->name,
2088                                     bssid, probe_wait_ms,
2089                                     ifmgd->probe_send_count, max_tries);
2090 #endif
2091                         ieee80211_mgd_probe_ap_send(sdata);
2092                 } else {
2093                         /*
2094                          * We actually lost the connection ... or did we?
2095                          * Let's make sure!
2096                          */
2097                         wiphy_debug(local->hw.wiphy,
2098                                     "%s: No probe response from AP %pM"
2099                                     " after %dms, disconnecting.\n",
2100                                     sdata->name,
2101                                     bssid, probe_wait_ms);
2102
2103                         ieee80211_sta_connection_lost(sdata, bssid);
2104                 }
2105         }
2106
2107         mutex_unlock(&ifmgd->mtx);
2108 }
2109
2110 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2111 {
2112         struct ieee80211_sub_if_data *sdata =
2113                 (struct ieee80211_sub_if_data *) data;
2114         struct ieee80211_local *local = sdata->local;
2115
2116         if (local->quiescing)
2117                 return;
2118
2119         ieee80211_queue_work(&sdata->local->hw,
2120                              &sdata->u.mgd.beacon_connection_loss_work);
2121 }
2122
2123 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2124 {
2125         struct ieee80211_sub_if_data *sdata =
2126                 (struct ieee80211_sub_if_data *) data;
2127         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2128         struct ieee80211_local *local = sdata->local;
2129
2130         if (local->quiescing)
2131                 return;
2132
2133         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2134 }
2135
2136 static void ieee80211_sta_monitor_work(struct work_struct *work)
2137 {
2138         struct ieee80211_sub_if_data *sdata =
2139                 container_of(work, struct ieee80211_sub_if_data,
2140                              u.mgd.monitor_work);
2141
2142         ieee80211_mgd_probe_ap(sdata, false);
2143 }
2144
2145 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2146 {
2147         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2148                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2149                                         IEEE80211_STA_CONNECTION_POLL);
2150
2151                 /* let's probe the connection once */
2152                 ieee80211_queue_work(&sdata->local->hw,
2153                            &sdata->u.mgd.monitor_work);
2154                 /* and do all the other regular work too */
2155                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2156         }
2157 }
2158
2159 #ifdef CONFIG_PM
2160 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2161 {
2162         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2163
2164         /*
2165          * we need to use atomic bitops for the running bits
2166          * only because both timers might fire at the same
2167          * time -- the code here is properly synchronised.
2168          */
2169
2170         cancel_work_sync(&ifmgd->request_smps_work);
2171
2172         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2173         if (del_timer_sync(&ifmgd->timer))
2174                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2175
2176         cancel_work_sync(&ifmgd->chswitch_work);
2177         if (del_timer_sync(&ifmgd->chswitch_timer))
2178                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2179
2180         cancel_work_sync(&ifmgd->monitor_work);
2181         /* these will just be re-established on connection */
2182         del_timer_sync(&ifmgd->conn_mon_timer);
2183         del_timer_sync(&ifmgd->bcn_mon_timer);
2184 }
2185
2186 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2187 {
2188         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2189
2190         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2191                 add_timer(&ifmgd->timer);
2192         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2193                 add_timer(&ifmgd->chswitch_timer);
2194         ieee80211_sta_reset_beacon_monitor(sdata);
2195         ieee80211_restart_sta_timer(sdata);
2196 }
2197 #endif
2198
2199 /* interface setup */
2200 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2201 {
2202         struct ieee80211_if_managed *ifmgd;
2203
2204         ifmgd = &sdata->u.mgd;
2205         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2206         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2207         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2208                   ieee80211_beacon_connection_loss_work);
2209         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2210         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2211                     (unsigned long) sdata);
2212         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2213                     (unsigned long) sdata);
2214         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2215                     (unsigned long) sdata);
2216         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2217                     (unsigned long) sdata);
2218
2219         ifmgd->flags = 0;
2220
2221         mutex_init(&ifmgd->mtx);
2222
2223         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2224                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2225         else
2226                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2227 }
2228
2229 /* scan finished notification */
2230 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2231 {
2232         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2233
2234         /* Restart STA timers */
2235         rcu_read_lock();
2236         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2237                 ieee80211_restart_sta_timer(sdata);
2238         rcu_read_unlock();
2239 }
2240
2241 int ieee80211_max_network_latency(struct notifier_block *nb,
2242                                   unsigned long data, void *dummy)
2243 {
2244         s32 latency_usec = (s32) data;
2245         struct ieee80211_local *local =
2246                 container_of(nb, struct ieee80211_local,
2247                              network_latency_notifier);
2248
2249         mutex_lock(&local->iflist_mtx);
2250         ieee80211_recalc_ps(local, latency_usec);
2251         mutex_unlock(&local->iflist_mtx);
2252
2253         return 0;
2254 }
2255
2256 /* config hooks */
2257 static enum work_done_result
2258 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2259                           struct sk_buff *skb)
2260 {
2261         if (!skb) {
2262                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2263                 return WORK_DONE_DESTROY;
2264         }
2265
2266         if (wk->type == IEEE80211_WORK_AUTH) {
2267                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2268                 return WORK_DONE_DESTROY;
2269         }
2270
2271         mutex_lock(&wk->sdata->u.mgd.mtx);
2272         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2273         mutex_unlock(&wk->sdata->u.mgd.mtx);
2274
2275         wk->type = IEEE80211_WORK_AUTH;
2276         wk->probe_auth.tries = 0;
2277         return WORK_DONE_REQUEUE;
2278 }
2279
2280 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2281                        struct cfg80211_auth_request *req)
2282 {
2283         const u8 *ssid;
2284         struct ieee80211_work *wk;
2285         u16 auth_alg;
2286
2287         if (req->local_state_change)
2288                 return 0; /* no need to update mac80211 state */
2289
2290         switch (req->auth_type) {
2291         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2292                 auth_alg = WLAN_AUTH_OPEN;
2293                 break;
2294         case NL80211_AUTHTYPE_SHARED_KEY:
2295                 if (IS_ERR(sdata->local->wep_tx_tfm))
2296                         return -EOPNOTSUPP;
2297                 auth_alg = WLAN_AUTH_SHARED_KEY;
2298                 break;
2299         case NL80211_AUTHTYPE_FT:
2300                 auth_alg = WLAN_AUTH_FT;
2301                 break;
2302         case NL80211_AUTHTYPE_NETWORK_EAP:
2303                 auth_alg = WLAN_AUTH_LEAP;
2304                 break;
2305         default:
2306                 return -EOPNOTSUPP;
2307         }
2308
2309         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2310         if (!wk)
2311                 return -ENOMEM;
2312
2313         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2314
2315         if (req->ie && req->ie_len) {
2316                 memcpy(wk->ie, req->ie, req->ie_len);
2317                 wk->ie_len = req->ie_len;
2318         }
2319
2320         if (req->key && req->key_len) {
2321                 wk->probe_auth.key_len = req->key_len;
2322                 wk->probe_auth.key_idx = req->key_idx;
2323                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2324         }
2325
2326         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2327         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2328         wk->probe_auth.ssid_len = ssid[1];
2329
2330         wk->probe_auth.algorithm = auth_alg;
2331         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2332
2333         /* if we already have a probe, don't probe again */
2334         if (req->bss->proberesp_ies)
2335                 wk->type = IEEE80211_WORK_AUTH;
2336         else
2337                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2338         wk->chan = req->bss->channel;
2339         wk->chan_type = NL80211_CHAN_NO_HT;
2340         wk->sdata = sdata;
2341         wk->done = ieee80211_probe_auth_done;
2342
2343         ieee80211_add_work(wk);
2344         return 0;
2345 }
2346
2347 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2348                                                   struct sk_buff *skb)
2349 {
2350         struct ieee80211_mgmt *mgmt;
2351         struct ieee80211_rx_status *rx_status;
2352         struct ieee802_11_elems elems;
2353         u16 status;
2354
2355         if (!skb) {
2356                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2357                 return WORK_DONE_DESTROY;
2358         }
2359
2360         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2361                 mutex_lock(&wk->sdata->u.mgd.mtx);
2362                 rx_status = (void *) skb->cb;
2363                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2364                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2365                                       &elems, true);
2366                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2367
2368                 wk->type = IEEE80211_WORK_ASSOC;
2369                 /* not really done yet */
2370                 return WORK_DONE_REQUEUE;
2371         }
2372
2373         mgmt = (void *)skb->data;
2374         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2375
2376         if (status == WLAN_STATUS_SUCCESS) {
2377                 mutex_lock(&wk->sdata->u.mgd.mtx);
2378                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2379                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2380                         /* oops -- internal error -- send timeout for now */
2381                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2382                                                     wk->filter_ta);
2383                         return WORK_DONE_DESTROY;
2384                 }
2385
2386                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2387         }
2388
2389         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2390         return WORK_DONE_DESTROY;
2391 }
2392
2393 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2394                         struct cfg80211_assoc_request *req)
2395 {
2396         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2397         struct ieee80211_bss *bss = (void *)req->bss->priv;
2398         struct ieee80211_work *wk;
2399         const u8 *ssid;
2400         int i;
2401
2402         mutex_lock(&ifmgd->mtx);
2403         if (ifmgd->associated) {
2404                 if (!req->prev_bssid ||
2405                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2406                            ETH_ALEN)) {
2407                         /*
2408                          * We are already associated and the request was not a
2409                          * reassociation request from the current BSS, so
2410                          * reject it.
2411                          */
2412                         mutex_unlock(&ifmgd->mtx);
2413                         return -EALREADY;
2414                 }
2415
2416                 /* Trying to reassociate - clear previous association state */
2417                 ieee80211_set_disassoc(sdata, true, false);
2418         }
2419         mutex_unlock(&ifmgd->mtx);
2420
2421         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2422         if (!wk)
2423                 return -ENOMEM;
2424
2425         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2426         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2427
2428         ifmgd->beacon_crc_valid = false;
2429
2430         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2431                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2432                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2433                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2434                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2435
2436
2437         if (req->ie && req->ie_len) {
2438                 memcpy(wk->ie, req->ie, req->ie_len);
2439                 wk->ie_len = req->ie_len;
2440         } else
2441                 wk->ie_len = 0;
2442
2443         wk->assoc.bss = req->bss;
2444
2445         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2446
2447         /* new association always uses requested smps mode */
2448         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2449                 if (ifmgd->powersave)
2450                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2451                 else
2452                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2453         } else
2454                 ifmgd->ap_smps = ifmgd->req_smps;
2455
2456         wk->assoc.smps = ifmgd->ap_smps;
2457         /*
2458          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2459          * We still associate in non-HT mode (11a/b/g) if any one of these
2460          * ciphers is configured as pairwise.
2461          * We can set this to true for non-11n hardware, that'll be checked
2462          * separately along with the peer capabilities.
2463          */
2464         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2465         wk->assoc.capability = req->bss->capability;
2466         wk->assoc.wmm_used = bss->wmm_used;
2467         wk->assoc.supp_rates = bss->supp_rates;
2468         wk->assoc.supp_rates_len = bss->supp_rates_len;
2469         wk->assoc.ht_information_ie =
2470                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2471
2472         if (bss->wmm_used && bss->uapsd_supported &&
2473             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2474                 wk->assoc.uapsd_used = true;
2475                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2476         } else {
2477                 wk->assoc.uapsd_used = false;
2478                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2479         }
2480
2481         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2482         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2483         wk->assoc.ssid_len = ssid[1];
2484
2485         if (req->prev_bssid)
2486                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2487
2488         wk->chan = req->bss->channel;
2489         wk->chan_type = NL80211_CHAN_NO_HT;
2490         wk->sdata = sdata;
2491         wk->done = ieee80211_assoc_done;
2492         if (!bss->dtim_period &&
2493             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2494                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2495         else
2496                 wk->type = IEEE80211_WORK_ASSOC;
2497
2498         if (req->use_mfp) {
2499                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2500                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2501         } else {
2502                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2503                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2504         }
2505
2506         if (req->crypto.control_port)
2507                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2508         else
2509                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2510
2511         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2512         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2513
2514         ieee80211_add_work(wk);
2515         return 0;
2516 }
2517
2518 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2519                          struct cfg80211_deauth_request *req,
2520                          void *cookie)
2521 {
2522         struct ieee80211_local *local = sdata->local;
2523         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2524         struct ieee80211_work *wk;
2525         u8 bssid[ETH_ALEN];
2526         bool assoc_bss = false;
2527
2528         mutex_lock(&ifmgd->mtx);
2529
2530         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2531         if (ifmgd->associated == req->bss) {
2532                 ieee80211_set_disassoc(sdata, false, true);
2533                 mutex_unlock(&ifmgd->mtx);
2534                 assoc_bss = true;
2535         } else {
2536                 bool not_auth_yet = false;
2537
2538                 mutex_unlock(&ifmgd->mtx);
2539
2540                 mutex_lock(&local->mtx);
2541                 list_for_each_entry(wk, &local->work_list, list) {
2542                         if (wk->sdata != sdata)
2543                                 continue;
2544
2545                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2546                             wk->type != IEEE80211_WORK_AUTH &&
2547                             wk->type != IEEE80211_WORK_ASSOC &&
2548                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2549                                 continue;
2550
2551                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2552                                 continue;
2553
2554                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2555                         list_del_rcu(&wk->list);
2556                         free_work(wk);
2557                         break;
2558                 }
2559                 mutex_unlock(&local->mtx);
2560
2561                 /*
2562                  * If somebody requests authentication and we haven't
2563                  * sent out an auth frame yet there's no need to send
2564                  * out a deauth frame either. If the state was PROBE,
2565                  * then this is the case. If it's AUTH we have sent a
2566                  * frame, and if it's IDLE we have completed the auth
2567                  * process already.
2568                  */
2569                 if (not_auth_yet) {
2570                         __cfg80211_auth_canceled(sdata->dev, bssid);
2571                         return 0;
2572                 }
2573         }
2574
2575         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2576                sdata->name, bssid, req->reason_code);
2577
2578         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2579                                        req->reason_code, cookie,
2580                                        !req->local_state_change);
2581         if (assoc_bss)
2582                 sta_info_destroy_addr(sdata, bssid);
2583
2584         mutex_lock(&sdata->local->mtx);
2585         ieee80211_recalc_idle(sdata->local);
2586         mutex_unlock(&sdata->local->mtx);
2587
2588         return 0;
2589 }
2590
2591 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2592                            struct cfg80211_disassoc_request *req,
2593                            void *cookie)
2594 {
2595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2596         u8 bssid[ETH_ALEN];
2597
2598         mutex_lock(&ifmgd->mtx);
2599
2600         /*
2601          * cfg80211 should catch this ... but it's racy since
2602          * we can receive a disassoc frame, process it, hand it
2603          * to cfg80211 while that's in a locked section already
2604          * trying to tell us that the user wants to disconnect.
2605          */
2606         if (ifmgd->associated != req->bss) {
2607                 mutex_unlock(&ifmgd->mtx);
2608                 return -ENOLINK;
2609         }
2610
2611         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2612                sdata->name, req->bss->bssid, req->reason_code);
2613
2614         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2615         ieee80211_set_disassoc(sdata, false, true);
2616
2617         mutex_unlock(&ifmgd->mtx);
2618
2619         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2620                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2621                         cookie, !req->local_state_change);
2622         sta_info_destroy_addr(sdata, bssid);
2623
2624         mutex_lock(&sdata->local->mtx);
2625         ieee80211_recalc_idle(sdata->local);
2626         mutex_unlock(&sdata->local->mtx);
2627
2628         return 0;
2629 }
2630
2631 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2632                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2633                                gfp_t gfp)
2634 {
2635         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2636
2637         trace_api_cqm_rssi_notify(sdata, rssi_event);
2638
2639         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2640 }
2641 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);