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_deauth() */
  94         RX_MGMT_CFG80211_DEAUTH,
  95
  96         /* caller must call cfg80211_send_disassoc() */
  97         RX_MGMT_CFG80211_DISASSOC,
  98 };
  99
 100 /* utils */
 101 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 102 {
 103         lockdep_assert_held(&ifmgd->mtx);
 104 }
 105
 106 /*
 107  * We can have multiple work items (and connection probing)
 108  * scheduling this timer, but we need to take care to only
 109  * reschedule it when it should fire _earlier_ than it was
 110  * asked for before, or if it's not pending right now. This
 111  * function ensures that. Note that it then is required to
 112  * run this function for all timeouts after the first one
 113  * has happened -- the work that runs from this timer will
 114  * do that.
 115  */
 116 static void run_again(struct ieee80211_if_managed *ifmgd,
 117                              unsigned long timeout)
 118 {
 119         ASSERT_MGD_MTX(ifmgd);
 120
 121         if (!timer_pending(&ifmgd->timer) ||
 122             time_before(timeout, ifmgd->timer.expires))
 123                 mod_timer(&ifmgd->timer, timeout);
 124 }
 125
 126 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 127 {
 128         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 129                 return;
 130
 131         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 132                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 133 }
 134
 135 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 136 {
 137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 138
 139         if (unlikely(!sdata->u.mgd.associated))
 140                 return;
 141
 142         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 143                 return;
 144
 145         mod_timer(&sdata->u.mgd.conn_mon_timer,
 146                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 147
 148         ifmgd->probe_send_count = 0;
 149 }
 150
 151 static int ecw2cw(int ecw)
 152 {
 153         return (1 << ecw) - 1;
 154 }
 155
 156 /*
 157  * ieee80211_enable_ht should be called only after the operating band
 158  * has been determined as ht configuration depends on the hw's
 159  * HT abilities for a specific band.
 160  */
 161 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 162                                struct ieee80211_ht_info *hti,
 163                                const u8 *bssid, u16 ap_ht_cap_flags)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_supported_band *sband;
 167         struct sta_info *sta;
 168         u32 changed = 0;
 169         int hti_cfreq;
 170         u16 ht_opmode;
 171         bool enable_ht = true;
 172         enum nl80211_channel_type prev_chantype;
 173         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 174
 175         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 176
 177         prev_chantype = sdata->vif.bss_conf.channel_type;
 178
 179         /* HT is not supported */
 180         if (!sband->ht_cap.ht_supported)
 181                 enable_ht = false;
 182
 183         if (enable_ht) {
 184                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 185                                                            sband->band);
 186                 /* check that channel matches the right operating channel */
 187                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 188                         /* Some APs mess this up, evidently.
 189                          * Netgear WNDR3700 sometimes reports 4 higher than
 190                          * the actual channel, for instance.
 191                          */
 192                         printk(KERN_DEBUG
 193                                "%s: Wrong control channel in association"
 194                                " response: configured center-freq: %d"
 195                                " hti-cfreq: %d  hti->control_chan: %d"
 196                                " band: %d.  Disabling HT.\n",
 197                                sdata->name,
 198                                local->hw.conf.channel->center_freq,
 199                                hti_cfreq, hti->control_chan,
 200                                sband->band);
 201                         enable_ht = false;
 202                 }
 203         }
 204
 205         if (enable_ht) {
 206                 channel_type = NL80211_CHAN_HT20;
 207
 208                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 209                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 210                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 211                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 212                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 213                                 if (!(local->hw.conf.channel->flags &
 214                                     IEEE80211_CHAN_NO_HT40PLUS))
 215                                         channel_type = NL80211_CHAN_HT40PLUS;
 216                                 break;
 217                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 218                                 if (!(local->hw.conf.channel->flags &
 219                                     IEEE80211_CHAN_NO_HT40MINUS))
 220                                         channel_type = NL80211_CHAN_HT40MINUS;
 221                                 break;
 222                         }
 223                 }
 224         }
 225
 226         if (local->tmp_channel)
 227                 local->tmp_channel_type = channel_type;
 228
 229         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 230                 /* can only fail due to HT40+/- mismatch */
 231                 channel_type = NL80211_CHAN_HT20;
 232                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 233         }
 234
 235         /* channel_type change automatically detected */
 236         ieee80211_hw_config(local, 0);
 237
 238         if (prev_chantype != channel_type) {
 239                 rcu_read_lock();
 240                 sta = sta_info_get(sdata, bssid);
 241                 if (sta)
 242                         rate_control_rate_update(local, sband, sta,
 243                                                  IEEE80211_RC_HT_CHANGED,
 244                                                  channel_type);
 245                 rcu_read_unlock();
 246         }
 247
 248         ht_opmode = le16_to_cpu(hti->operation_mode);
 249
 250         /* if bss configuration changed store the new one */
 251         if (sdata->ht_opmode_valid != enable_ht ||
 252             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 253             prev_chantype != channel_type) {
 254                 changed |= BSS_CHANGED_HT;
 255                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 256                 sdata->ht_opmode_valid = enable_ht;
 257         }
 258
 259         return changed;
 260 }
 261
 262 /* frame sending functions */
 263
 264 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 265                                            const u8 *bssid, u16 stype, u16 reason,
 266                                            void *cookie, bool send_frame)
 267 {
 268         struct ieee80211_local *local = sdata->local;
 269         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 270         struct sk_buff *skb;
 271         struct ieee80211_mgmt *mgmt;
 272
 273         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 274         if (!skb) {
 275                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 276                        "deauth/disassoc frame\n", sdata->name);
 277                 return;
 278         }
 279         skb_reserve(skb, local->hw.extra_tx_headroom);
 280
 281         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 282         memset(mgmt, 0, 24);
 283         memcpy(mgmt->da, bssid, ETH_ALEN);
 284         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 285         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 286         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 287         skb_put(skb, 2);
 288         /* u.deauth.reason_code == u.disassoc.reason_code */
 289         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 290
 291         if (stype == IEEE80211_STYPE_DEAUTH)
 292                 if (cookie)
 293                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 294                 else
 295                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 296         else
 297                 if (cookie)
 298                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 299                 else
 300                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 301         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 302                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 303
 304         if (send_frame)
 305                 ieee80211_tx_skb(sdata, skb);
 306         else
 307                 kfree_skb(skb);
 308 }
 309
 310 void ieee80211_send_pspoll(struct ieee80211_local *local,
 311                            struct ieee80211_sub_if_data *sdata)
 312 {
 313         struct ieee80211_pspoll *pspoll;
 314         struct sk_buff *skb;
 315
 316         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 317         if (!skb)
 318                 return;
 319
 320         pspoll = (struct ieee80211_pspoll *) skb->data;
 321         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 322
 323         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 324         ieee80211_tx_skb(sdata, skb);
 325 }
 326
 327 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 328                              struct ieee80211_sub_if_data *sdata,
 329                              int powersave)
 330 {
 331         struct sk_buff *skb;
 332         struct ieee80211_hdr_3addr *nullfunc;
 333
 334         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 335         if (!skb)
 336                 return;
 337
 338         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 339         if (powersave)
 340                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 341
 342         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 343         ieee80211_tx_skb(sdata, skb);
 344 }
 345
 346 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 347                                           struct ieee80211_sub_if_data *sdata)
 348 {
 349         struct sk_buff *skb;
 350         struct ieee80211_hdr *nullfunc;
 351         __le16 fc;
 352
 353         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 354                 return;
 355
 356         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 357         if (!skb) {
 358                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 359                        "nullfunc frame\n", sdata->name);
 360                 return;
 361         }
 362         skb_reserve(skb, local->hw.extra_tx_headroom);
 363
 364         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 365         memset(nullfunc, 0, 30);
 366         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 367                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 368         nullfunc->frame_control = fc;
 369         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 370         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 371         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 372         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 373
 374         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 375         ieee80211_tx_skb(sdata, skb);
 376 }
 377
 378 /* spectrum management related things */
 379 static void ieee80211_chswitch_work(struct work_struct *work)
 380 {
 381         struct ieee80211_sub_if_data *sdata =
 382                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 383         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 384
 385         if (!ieee80211_sdata_running(sdata))
 386                 return;
 387
 388         mutex_lock(&ifmgd->mtx);
 389         if (!ifmgd->associated)
 390                 goto out;
 391
 392         sdata->local->oper_channel = sdata->local->csa_channel;
 393         if (!sdata->local->ops->channel_switch) {
 394                 /* call "hw_config" only if doing sw channel switch */
 395                 ieee80211_hw_config(sdata->local,
 396                         IEEE80211_CONF_CHANGE_CHANNEL);
 397         }
 398
 399         /* XXX: shouldn't really modify cfg80211-owned data! */
 400         ifmgd->associated->channel = sdata->local->oper_channel;
 401
 402         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 403                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 404  out:
 405         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 406         mutex_unlock(&ifmgd->mtx);
 407 }
 408
 409 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 410 {
 411         struct ieee80211_sub_if_data *sdata;
 412         struct ieee80211_if_managed *ifmgd;
 413
 414         sdata = vif_to_sdata(vif);
 415         ifmgd = &sdata->u.mgd;
 416
 417         trace_api_chswitch_done(sdata, success);
 418         if (!success) {
 419                 /*
 420                  * If the channel switch was not successful, stay
 421                  * around on the old channel. We currently lack
 422                  * good handling of this situation, possibly we
 423                  * should just drop the association.
 424                  */
 425                 sdata->local->csa_channel = sdata->local->oper_channel;
 426         }
 427
 428         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 429 }
 430 EXPORT_SYMBOL(ieee80211_chswitch_done);
 431
 432 static void ieee80211_chswitch_timer(unsigned long data)
 433 {
 434         struct ieee80211_sub_if_data *sdata =
 435                 (struct ieee80211_sub_if_data *) data;
 436         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 437
 438         if (sdata->local->quiescing) {
 439                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 440                 return;
 441         }
 442
 443         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 444 }
 445
 446 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 447                                       struct ieee80211_channel_sw_ie *sw_elem,
 448                                       struct ieee80211_bss *bss,
 449                                       u64 timestamp)
 450 {
 451         struct cfg80211_bss *cbss =
 452                 container_of((void *)bss, struct cfg80211_bss, priv);
 453         struct ieee80211_channel *new_ch;
 454         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 455         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 456                                                       cbss->channel->band);
 457
 458         ASSERT_MGD_MTX(ifmgd);
 459
 460         if (!ifmgd->associated)
 461                 return;
 462
 463         if (sdata->local->scanning)
 464                 return;
 465
 466         /* Disregard subsequent beacons if we are already running a timer
 467            processing a CSA */
 468
 469         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 470                 return;
 471
 472         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 473         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 474                 return;
 475
 476         sdata->local->csa_channel = new_ch;
 477
 478         if (sdata->local->ops->channel_switch) {
 479                 /* use driver's channel switch callback */
 480                 struct ieee80211_channel_switch ch_switch;
 481                 memset(&ch_switch, 0, sizeof(ch_switch));
 482                 ch_switch.timestamp = timestamp;
 483                 if (sw_elem->mode) {
 484                         ch_switch.block_tx = true;
 485                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 486                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 487                 }
 488                 ch_switch.channel = new_ch;
 489                 ch_switch.count = sw_elem->count;
 490                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 491                 drv_channel_switch(sdata->local, &ch_switch);
 492                 return;
 493         }
 494
 495         /* channel switch handled in software */
 496         if (sw_elem->count <= 1) {
 497                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 498         } else {
 499                 if (sw_elem->mode)
 500                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 501                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 502                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 503                 mod_timer(&ifmgd->chswitch_timer,
 504                           jiffies +
 505                           msecs_to_jiffies(sw_elem->count *
 506                                            cbss->beacon_interval));
 507         }
 508 }
 509
 510 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 511                                         u16 capab_info, u8 *pwr_constr_elem,
 512                                         u8 pwr_constr_elem_len)
 513 {
 514         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 515
 516         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 517                 return;
 518
 519         /* Power constraint IE length should be 1 octet */
 520         if (pwr_constr_elem_len != 1)
 521                 return;
 522
 523         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 524             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 525                 sdata->local->power_constr_level = *pwr_constr_elem;
 526                 ieee80211_hw_config(sdata->local, 0);
 527         }
 528 }
 529
 530 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 531 {
 532         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 533         struct ieee80211_local *local = sdata->local;
 534         struct ieee80211_conf *conf = &local->hw.conf;
 535
 536         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 537                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 538                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 539
 540         local->disable_dynamic_ps = false;
 541         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 542 }
 543 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 544
 545 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 546 {
 547         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 548         struct ieee80211_local *local = sdata->local;
 549         struct ieee80211_conf *conf = &local->hw.conf;
 550
 551         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 552                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 553                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 554
 555         local->disable_dynamic_ps = true;
 556         conf->dynamic_ps_timeout = 0;
 557         del_timer_sync(&local->dynamic_ps_timer);
 558         ieee80211_queue_work(&local->hw,
 559                              &local->dynamic_ps_enable_work);
 560 }
 561 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 562
 563 /* powersave */
 564 static void ieee80211_enable_ps(struct ieee80211_local *local,
 565                                 struct ieee80211_sub_if_data *sdata)
 566 {
 567         struct ieee80211_conf *conf = &local->hw.conf;
 568
 569         /*
 570          * If we are scanning right now then the parameters will
 571          * take effect when scan finishes.
 572          */
 573         if (local->scanning)
 574                 return;
 575
 576         if (conf->dynamic_ps_timeout > 0 &&
 577             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 578                 mod_timer(&local->dynamic_ps_timer, jiffies +
 579                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 580         } else {
 581                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 582                         ieee80211_send_nullfunc(local, sdata, 1);
 583
 584                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 585                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 586                         return;
 587
 588                 conf->flags |= IEEE80211_CONF_PS;
 589                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 590         }
 591 }
 592
 593 static void ieee80211_change_ps(struct ieee80211_local *local)
 594 {
 595         struct ieee80211_conf *conf = &local->hw.conf;
 596
 597         if (local->ps_sdata) {
 598                 ieee80211_enable_ps(local, local->ps_sdata);
 599         } else if (conf->flags & IEEE80211_CONF_PS) {
 600                 conf->flags &= ~IEEE80211_CONF_PS;
 601                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 602                 del_timer_sync(&local->dynamic_ps_timer);
 603                 cancel_work_sync(&local->dynamic_ps_enable_work);
 604         }
 605 }
 606
 607 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 608 {
 609         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 610         struct sta_info *sta = NULL;
 611         u32 sta_flags = 0;
 612
 613         if (!mgd->powersave)
 614                 return false;
 615
 616         if (!mgd->associated)
 617                 return false;
 618
 619         if (!mgd->associated->beacon_ies)
 620                 return false;
 621
 622         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 623                           IEEE80211_STA_CONNECTION_POLL))
 624                 return false;
 625
 626         rcu_read_lock();
 627         sta = sta_info_get(sdata, mgd->bssid);
 628         if (sta)
 629                 sta_flags = get_sta_flags(sta);
 630         rcu_read_unlock();
 631
 632         if (!(sta_flags & WLAN_STA_AUTHORIZED))
 633                 return false;
 634
 635         return true;
 636 }
 637
 638 /* need to hold RTNL or interface lock */
 639 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 640 {
 641         struct ieee80211_sub_if_data *sdata, *found = NULL;
 642         int count = 0;
 643         int timeout;
 644
 645         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 646                 local->ps_sdata = NULL;
 647                 return;
 648         }
 649
 650         if (!list_empty(&local->work_list)) {
 651                 local->ps_sdata = NULL;
 652                 goto change;
 653         }
 654
 655         list_for_each_entry(sdata, &local->interfaces, list) {
 656                 if (!ieee80211_sdata_running(sdata))
 657                         continue;
 658                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 659                         /* If an AP vif is found, then disable PS
 660                          * by setting the count to zero thereby setting
 661                          * ps_sdata to NULL.
 662                          */
 663                         count = 0;
 664                         break;
 665                 }
 666                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 667                         continue;
 668                 found = sdata;
 669                 count++;
 670         }
 671
 672         if (count == 1 && ieee80211_powersave_allowed(found)) {
 673                 struct ieee80211_conf *conf = &local->hw.conf;
 674                 s32 beaconint_us;
 675
 676                 if (latency < 0)
 677                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 678
 679                 beaconint_us = ieee80211_tu_to_usec(
 680                                         found->vif.bss_conf.beacon_int);
 681
 682                 timeout = local->dynamic_ps_forced_timeout;
 683                 if (timeout < 0) {
 684                         /*
 685                          * Go to full PSM if the user configures a very low
 686                          * latency requirement.
 687                          * The 2000 second value is there for compatibility
 688                          * until the PM_QOS_NETWORK_LATENCY is configured
 689                          * with real values.
 690                          */
 691                         if (latency > (1900 * USEC_PER_MSEC) &&
 692                             latency != (2000 * USEC_PER_SEC))
 693                                 timeout = 0;
 694                         else
 695                                 timeout = 100;
 696                 }
 697                 local->dynamic_ps_user_timeout = timeout;
 698                 if (!local->disable_dynamic_ps)
 699                         conf->dynamic_ps_timeout =
 700                                 local->dynamic_ps_user_timeout;
 701
 702                 if (beaconint_us > latency) {
 703                         local->ps_sdata = NULL;
 704                 } else {
 705                         struct ieee80211_bss *bss;
 706                         int maxslp = 1;
 707                         u8 dtimper;
 708
 709                         bss = (void *)found->u.mgd.associated->priv;
 710                         dtimper = bss->dtim_period;
 711
 712                         /* If the TIM IE is invalid, pretend the value is 1 */
 713                         if (!dtimper)
 714                                 dtimper = 1;
 715                         else if (dtimper > 1)
 716                                 maxslp = min_t(int, dtimper,
 717                                                     latency / beaconint_us);
 718
 719                         local->hw.conf.max_sleep_period = maxslp;
 720                         local->hw.conf.ps_dtim_period = dtimper;
 721                         local->ps_sdata = found;
 722                 }
 723         } else {
 724                 local->ps_sdata = NULL;
 725         }
 726
 727  change:
 728         ieee80211_change_ps(local);
 729 }
 730
 731 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 732 {
 733         struct ieee80211_local *local =
 734                 container_of(work, struct ieee80211_local,
 735                              dynamic_ps_disable_work);
 736
 737         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 738                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 739                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 740         }
 741
 742         ieee80211_wake_queues_by_reason(&local->hw,
 743                                         IEEE80211_QUEUE_STOP_REASON_PS);
 744 }
 745
 746 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 747 {
 748         struct ieee80211_local *local =
 749                 container_of(work, struct ieee80211_local,
 750                              dynamic_ps_enable_work);
 751         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 752         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 753         unsigned long flags;
 754         int q;
 755
 756         /* can only happen when PS was just disabled anyway */
 757         if (!sdata)
 758                 return;
 759
 760         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 761                 return;
 762
 763         /*
 764          * transmission can be stopped by others which leads to
 765          * dynamic_ps_timer expiry. Postpond the ps timer if it
 766          * is not the actual idle state.
 767          */
 768         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 769         for (q = 0; q < local->hw.queues; q++) {
 770                 if (local->queue_stop_reasons[q]) {
 771                         spin_unlock_irqrestore(&local->queue_stop_reason_lock,
 772                                                flags);
 773                         mod_timer(&local->dynamic_ps_timer, jiffies +
 774                                   msecs_to_jiffies(
 775                                   local->hw.conf.dynamic_ps_timeout));
 776                         return;
 777                 }
 778         }
 779         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 780
 781         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 782             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
 783                 netif_tx_stop_all_queues(sdata->dev);
 784
 785                 if (drv_tx_frames_pending(local))
 786                         mod_timer(&local->dynamic_ps_timer, jiffies +
 787                                   msecs_to_jiffies(
 788                                   local->hw.conf.dynamic_ps_timeout));
 789                 else {
 790                         ieee80211_send_nullfunc(local, sdata, 1);
 791                         /* Flush to get the tx status of nullfunc frame */
 792                         drv_flush(local, false);
 793                 }
 794         }
 795
 796         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 797               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 798             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 799                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 800                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 801                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 802         }
 803
 804         netif_tx_wake_all_queues(sdata->dev);
 805 }
 806
 807 void ieee80211_dynamic_ps_timer(unsigned long data)
 808 {
 809         struct ieee80211_local *local = (void *) data;
 810
 811         if (local->quiescing || local->suspended)
 812                 return;
 813
 814         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 815 }
 816
 817 /* MLME */
 818 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 819                                      struct ieee80211_sub_if_data *sdata,
 820                                      u8 *wmm_param, size_t wmm_param_len)
 821 {
 822         struct ieee80211_tx_queue_params params;
 823         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 824         size_t left;
 825         int count;
 826         u8 *pos, uapsd_queues = 0;
 827
 828         if (!local->ops->conf_tx)
 829                 return;
 830
 831         if (local->hw.queues < 4)
 832                 return;
 833
 834         if (!wmm_param)
 835                 return;
 836
 837         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 838                 return;
 839
 840         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 841                 uapsd_queues = local->uapsd_queues;
 842
 843         count = wmm_param[6] & 0x0f;
 844         if (count == ifmgd->wmm_last_param_set)
 845                 return;
 846         ifmgd->wmm_last_param_set = count;
 847
 848         pos = wmm_param + 8;
 849         left = wmm_param_len - 8;
 850
 851         memset(&params, 0, sizeof(params));
 852
 853         local->wmm_acm = 0;
 854         for (; left >= 4; left -= 4, pos += 4) {
 855                 int aci = (pos[0] >> 5) & 0x03;
 856                 int acm = (pos[0] >> 4) & 0x01;
 857                 bool uapsd = false;
 858                 int queue;
 859
 860                 switch (aci) {
 861                 case 1: /* AC_BK */
 862                         queue = 3;
 863                         if (acm)
 864                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 865                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 866                                 uapsd = true;
 867                         break;
 868                 case 2: /* AC_VI */
 869                         queue = 1;
 870                         if (acm)
 871                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 872                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 873                                 uapsd = true;
 874                         break;
 875                 case 3: /* AC_VO */
 876                         queue = 0;
 877                         if (acm)
 878                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 879                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 880                                 uapsd = true;
 881                         break;
 882                 case 0: /* AC_BE */
 883                 default:
 884                         queue = 2;
 885                         if (acm)
 886                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 887                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 888                                 uapsd = true;
 889                         break;
 890                 }
 891
 892                 params.aifs = pos[0] & 0x0f;
 893                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 894                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 895                 params.txop = get_unaligned_le16(pos + 2);
 896                 params.uapsd = uapsd;
 897
 898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 899                 wiphy_debug(local->hw.wiphy,
 900                             "WMM queue=%d aci=%d acm=%d aifs=%d "
 901                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 902                             queue, aci, acm,
 903                             params.aifs, params.cw_min, params.cw_max,
 904                             params.txop, params.uapsd);
 905 #endif
 906                 if (drv_conf_tx(local, queue, &params))
 907                         wiphy_debug(local->hw.wiphy,
 908                                     "failed to set TX queue parameters for queue %d\n",
 909                                     queue);
 910         }
 911
 912         /* enable WMM or activate new settings */
 913         sdata->vif.bss_conf.qos = true;
 914         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 915 }
 916
 917 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 918                                            u16 capab, bool erp_valid, u8 erp)
 919 {
 920         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 921         u32 changed = 0;
 922         bool use_protection;
 923         bool use_short_preamble;
 924         bool use_short_slot;
 925
 926         if (erp_valid) {
 927                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 928                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 929         } else {
 930                 use_protection = false;
 931                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 932         }
 933
 934         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 935         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 936                 use_short_slot = true;
 937
 938         if (use_protection != bss_conf->use_cts_prot) {
 939                 bss_conf->use_cts_prot = use_protection;
 940                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 941         }
 942
 943         if (use_short_preamble != bss_conf->use_short_preamble) {
 944                 bss_conf->use_short_preamble = use_short_preamble;
 945                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 946         }
 947
 948         if (use_short_slot != bss_conf->use_short_slot) {
 949                 bss_conf->use_short_slot = use_short_slot;
 950                 changed |= BSS_CHANGED_ERP_SLOT;
 951         }
 952
 953         return changed;
 954 }
 955
 956 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 957                                      struct cfg80211_bss *cbss,
 958                                      u32 bss_info_changed)
 959 {
 960         struct ieee80211_bss *bss = (void *)cbss->priv;
 961         struct ieee80211_local *local = sdata->local;
 962         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 963
 964         bss_info_changed |= BSS_CHANGED_ASSOC;
 965         /* set timing information */
 966         bss_conf->beacon_int = cbss->beacon_interval;
 967         bss_conf->timestamp = cbss->tsf;
 968
 969         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 970         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 971                 cbss->capability, bss->has_erp_value, bss->erp_value);
 972
 973         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
 974                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
 975
 976         sdata->u.mgd.associated = cbss;
 977         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 978
 979         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 980
 981         /* just to be sure */
 982         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 983                                 IEEE80211_STA_BEACON_POLL);
 984
 985         ieee80211_led_assoc(local, 1);
 986
 987         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
 988                 bss_conf->dtim_period = bss->dtim_period;
 989         else
 990                 bss_conf->dtim_period = 0;
 991
 992         bss_conf->assoc = 1;
 993         /*
 994          * For now just always ask the driver to update the basic rateset
 995          * when we have associated, we aren't checking whether it actually
 996          * changed or not.
 997          */
 998         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 999
1000         /* And the BSSID changed - we're associated now */
1001         bss_info_changed |= BSS_CHANGED_BSSID;
1002
1003         /* Tell the driver to monitor connection quality (if supported) */
1004         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1005             bss_conf->cqm_rssi_thold)
1006                 bss_info_changed |= BSS_CHANGED_CQM;
1007
1008         /* Enable ARP filtering */
1009         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1010                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1011                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1012         }
1013
1014         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1015
1016         mutex_lock(&local->iflist_mtx);
1017         ieee80211_recalc_ps(local, -1);
1018         ieee80211_recalc_smps(local);
1019         mutex_unlock(&local->iflist_mtx);
1020
1021         netif_tx_start_all_queues(sdata->dev);
1022         netif_carrier_on(sdata->dev);
1023 }
1024
1025 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1026                                    bool remove_sta, bool tx)
1027 {
1028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1029         struct ieee80211_local *local = sdata->local;
1030         struct sta_info *sta;
1031         u32 changed = 0, config_changed = 0;
1032         u8 bssid[ETH_ALEN];
1033
1034         ASSERT_MGD_MTX(ifmgd);
1035
1036         if (WARN_ON(!ifmgd->associated))
1037                 return;
1038
1039         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1040
1041         ifmgd->associated = NULL;
1042         memset(ifmgd->bssid, 0, ETH_ALEN);
1043
1044         /*
1045          * we need to commit the associated = NULL change because the
1046          * scan code uses that to determine whether this iface should
1047          * go to/wake up from powersave or not -- and could otherwise
1048          * wake the queues erroneously.
1049          */
1050         smp_mb();
1051
1052         /*
1053          * Thus, we can only afterwards stop the queues -- to account
1054          * for the case where another CPU is finishing a scan at this
1055          * time -- we don't want the scan code to enable queues.
1056          */
1057
1058         netif_tx_stop_all_queues(sdata->dev);
1059         netif_carrier_off(sdata->dev);
1060
1061         mutex_lock(&local->sta_mtx);
1062         sta = sta_info_get(sdata, bssid);
1063         if (sta) {
1064                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1065                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1066         }
1067         mutex_unlock(&local->sta_mtx);
1068
1069         changed |= ieee80211_reset_erp_info(sdata);
1070
1071         ieee80211_led_assoc(local, 0);
1072         changed |= BSS_CHANGED_ASSOC;
1073         sdata->vif.bss_conf.assoc = false;
1074
1075         ieee80211_set_wmm_default(sdata);
1076
1077         /* channel(_type) changes are handled by ieee80211_hw_config */
1078         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1079
1080         /* on the next assoc, re-program HT parameters */
1081         sdata->ht_opmode_valid = false;
1082
1083         local->power_constr_level = 0;
1084
1085         del_timer_sync(&local->dynamic_ps_timer);
1086         cancel_work_sync(&local->dynamic_ps_enable_work);
1087
1088         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1089                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1090                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1091         }
1092         local->ps_sdata = NULL;
1093
1094         ieee80211_hw_config(local, config_changed);
1095
1096         /* Disable ARP filtering */
1097         if (sdata->vif.bss_conf.arp_filter_enabled) {
1098                 sdata->vif.bss_conf.arp_filter_enabled = false;
1099                 changed |= BSS_CHANGED_ARP_FILTER;
1100         }
1101
1102         /* The BSSID (not really interesting) and HT changed */
1103         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1104         ieee80211_bss_info_change_notify(sdata, changed);
1105
1106         if (remove_sta)
1107                 sta_info_destroy_addr(sdata, bssid);
1108
1109         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1110         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1111         del_timer_sync(&sdata->u.mgd.timer);
1112         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1113 }
1114
1115 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1116                              struct ieee80211_hdr *hdr)
1117 {
1118         /*
1119          * We can postpone the mgd.timer whenever receiving unicast frames
1120          * from AP because we know that the connection is working both ways
1121          * at that time. But multicast frames (and hence also beacons) must
1122          * be ignored here, because we need to trigger the timer during
1123          * data idle periods for sending the periodic probe request to the
1124          * AP we're connected to.
1125          */
1126         if (is_multicast_ether_addr(hdr->addr1))
1127                 return;
1128
1129         ieee80211_sta_reset_conn_monitor(sdata);
1130 }
1131
1132 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1133 {
1134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1135
1136         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1137                               IEEE80211_STA_CONNECTION_POLL)))
1138             return;
1139
1140         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1141                           IEEE80211_STA_BEACON_POLL);
1142         mutex_lock(&sdata->local->iflist_mtx);
1143         ieee80211_recalc_ps(sdata->local, -1);
1144         mutex_unlock(&sdata->local->iflist_mtx);
1145
1146         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1147                 return;
1148
1149         /*
1150          * We've received a probe response, but are not sure whether
1151          * we have or will be receiving any beacons or data, so let's
1152          * schedule the timers again, just in case.
1153          */
1154         ieee80211_sta_reset_beacon_monitor(sdata);
1155
1156         mod_timer(&ifmgd->conn_mon_timer,
1157                   round_jiffies_up(jiffies +
1158                                    IEEE80211_CONNECTION_IDLE_TIME));
1159 }
1160
1161 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1162                              struct ieee80211_hdr *hdr, bool ack)
1163 {
1164         if (!ieee80211_is_data(hdr->frame_control))
1165             return;
1166
1167         if (ack)
1168                 ieee80211_sta_reset_conn_monitor(sdata);
1169
1170         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1171             sdata->u.mgd.probe_send_count > 0) {
1172                 if (ack)
1173                         sdata->u.mgd.probe_send_count = 0;
1174                 else
1175                         sdata->u.mgd.nullfunc_failed = true;
1176                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1177         }
1178 }
1179
1180 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1181 {
1182         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1183         const u8 *ssid;
1184         u8 *dst = ifmgd->associated->bssid;
1185         u8 unicast_limit = max(1, max_probe_tries - 3);
1186
1187         /*
1188          * Try sending broadcast probe requests for the last three
1189          * probe requests after the first ones failed since some
1190          * buggy APs only support broadcast probe requests.
1191          */
1192         if (ifmgd->probe_send_count >= unicast_limit)
1193                 dst = NULL;
1194
1195         /*
1196          * When the hardware reports an accurate Tx ACK status, it's
1197          * better to send a nullfunc frame instead of a probe request,
1198          * as it will kick us off the AP quickly if we aren't associated
1199          * anymore. The timeout will be reset if the frame is ACKed by
1200          * the AP.
1201          */
1202         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1203                 ifmgd->nullfunc_failed = false;
1204                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1205         } else {
1206                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1207                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1208                                          true);
1209         }
1210
1211         ifmgd->probe_send_count++;
1212         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1213         run_again(ifmgd, ifmgd->probe_timeout);
1214 }
1215
1216 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1217                                    bool beacon)
1218 {
1219         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1220         bool already = false;
1221
1222         if (!ieee80211_sdata_running(sdata))
1223                 return;
1224
1225         if (sdata->local->scanning)
1226                 return;
1227
1228         if (sdata->local->tmp_channel)
1229                 return;
1230
1231         mutex_lock(&ifmgd->mtx);
1232
1233         if (!ifmgd->associated)
1234                 goto out;
1235
1236 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1237         if (beacon && net_ratelimit())
1238                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1239                        "- sending probe request\n", sdata->name);
1240 #endif
1241
1242         /*
1243          * The driver/our work has already reported this event or the
1244          * connection monitoring has kicked in and we have already sent
1245          * a probe request. Or maybe the AP died and the driver keeps
1246          * reporting until we disassociate...
1247          *
1248          * In either case we have to ignore the current call to this
1249          * function (except for setting the correct probe reason bit)
1250          * because otherwise we would reset the timer every time and
1251          * never check whether we received a probe response!
1252          */
1253         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1254                             IEEE80211_STA_CONNECTION_POLL))
1255                 already = true;
1256
1257         if (beacon)
1258                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1259         else
1260                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1261
1262         if (already)
1263                 goto out;
1264
1265         mutex_lock(&sdata->local->iflist_mtx);
1266         ieee80211_recalc_ps(sdata->local, -1);
1267         mutex_unlock(&sdata->local->iflist_mtx);
1268
1269         ifmgd->probe_send_count = 0;
1270         ieee80211_mgd_probe_ap_send(sdata);
1271  out:
1272         mutex_unlock(&ifmgd->mtx);
1273 }
1274
1275 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1276                                           struct ieee80211_vif *vif)
1277 {
1278         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1279         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1280         struct sk_buff *skb;
1281         const u8 *ssid;
1282
1283         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1284                 return NULL;
1285
1286         ASSERT_MGD_MTX(ifmgd);
1287
1288         if (!ifmgd->associated)
1289                 return NULL;
1290
1291         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1292         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1293                                         ssid + 2, ssid[1], NULL, 0, true);
1294
1295         return skb;
1296 }
1297 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1298
1299 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1300 {
1301         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1302         struct ieee80211_local *local = sdata->local;
1303         u8 bssid[ETH_ALEN];
1304
1305         mutex_lock(&ifmgd->mtx);
1306         if (!ifmgd->associated) {
1307                 mutex_unlock(&ifmgd->mtx);
1308                 return;
1309         }
1310
1311         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1312
1313         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1314                sdata->name, bssid);
1315
1316         ieee80211_set_disassoc(sdata, true, true);
1317         mutex_unlock(&ifmgd->mtx);
1318
1319         mutex_lock(&local->mtx);
1320         ieee80211_recalc_idle(local);
1321         mutex_unlock(&local->mtx);
1322         /*
1323          * must be outside lock due to cfg80211,
1324          * but that's not a problem.
1325          */
1326         ieee80211_send_deauth_disassoc(sdata, bssid,
1327                                        IEEE80211_STYPE_DEAUTH,
1328                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1329                                        NULL, true);
1330 }
1331
1332 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1333 {
1334         struct ieee80211_sub_if_data *sdata =
1335                 container_of(work, struct ieee80211_sub_if_data,
1336                              u.mgd.beacon_connection_loss_work);
1337
1338         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1339                 __ieee80211_connection_loss(sdata);
1340         else
1341                 ieee80211_mgd_probe_ap(sdata, true);
1342 }
1343
1344 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1345 {
1346         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1347         struct ieee80211_hw *hw = &sdata->local->hw;
1348
1349         trace_api_beacon_loss(sdata);
1350
1351         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1352         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1353 }
1354 EXPORT_SYMBOL(ieee80211_beacon_loss);
1355
1356 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1357 {
1358         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1359         struct ieee80211_hw *hw = &sdata->local->hw;
1360
1361         trace_api_connection_loss(sdata);
1362
1363         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1364         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1365 }
1366 EXPORT_SYMBOL(ieee80211_connection_loss);
1367
1368
1369 static enum rx_mgmt_action __must_check
1370 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1371                          struct ieee80211_mgmt *mgmt, size_t len)
1372 {
1373         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1374         const u8 *bssid = NULL;
1375         u16 reason_code;
1376
1377         if (len < 24 + 2)
1378                 return RX_MGMT_NONE;
1379
1380         ASSERT_MGD_MTX(ifmgd);
1381
1382         bssid = ifmgd->associated->bssid;
1383
1384         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1385
1386         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1387                         sdata->name, bssid, reason_code);
1388
1389         ieee80211_set_disassoc(sdata, true, false);
1390         mutex_lock(&sdata->local->mtx);
1391         ieee80211_recalc_idle(sdata->local);
1392         mutex_unlock(&sdata->local->mtx);
1393
1394         return RX_MGMT_CFG80211_DEAUTH;
1395 }
1396
1397
1398 static enum rx_mgmt_action __must_check
1399 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1400                            struct ieee80211_mgmt *mgmt, size_t len)
1401 {
1402         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1403         u16 reason_code;
1404
1405         if (len < 24 + 2)
1406                 return RX_MGMT_NONE;
1407
1408         ASSERT_MGD_MTX(ifmgd);
1409
1410         if (WARN_ON(!ifmgd->associated))
1411                 return RX_MGMT_NONE;
1412
1413         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1414                 return RX_MGMT_NONE;
1415
1416         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1417
1418         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1419                         sdata->name, mgmt->sa, reason_code);
1420
1421         ieee80211_set_disassoc(sdata, true, false);
1422         mutex_lock(&sdata->local->mtx);
1423         ieee80211_recalc_idle(sdata->local);
1424         mutex_unlock(&sdata->local->mtx);
1425         return RX_MGMT_CFG80211_DISASSOC;
1426 }
1427
1428
1429 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1430                                     struct ieee80211_mgmt *mgmt, size_t len)
1431 {
1432         struct ieee80211_sub_if_data *sdata = wk->sdata;
1433         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1434         struct ieee80211_local *local = sdata->local;
1435         struct ieee80211_supported_band *sband;
1436         struct sta_info *sta;
1437         struct cfg80211_bss *cbss = wk->assoc.bss;
1438         u8 *pos;
1439         u32 rates, basic_rates;
1440         u16 capab_info, aid;
1441         struct ieee802_11_elems elems;
1442         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1443         u32 changed = 0;
1444         int i, j, err;
1445         bool have_higher_than_11mbit = false;
1446         u16 ap_ht_cap_flags;
1447
1448         /* AssocResp and ReassocResp have identical structure */
1449
1450         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1451         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1452
1453         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1454                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1455                        "set\n", sdata->name, aid);
1456         aid &= ~(BIT(15) | BIT(14));
1457
1458         pos = mgmt->u.assoc_resp.variable;
1459         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1460
1461         if (!elems.supp_rates) {
1462                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1463                        sdata->name);
1464                 return false;
1465         }
1466
1467         ifmgd->aid = aid;
1468
1469         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1470         if (!sta) {
1471                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1472                        " the AP\n", sdata->name);
1473                 return false;
1474         }
1475
1476         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1477                            WLAN_STA_ASSOC_AP);
1478         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1479                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1480
1481         rates = 0;
1482         basic_rates = 0;
1483         sband = local->hw.wiphy->bands[wk->chan->band];
1484
1485         for (i = 0; i < elems.supp_rates_len; i++) {
1486                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1487                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1488
1489                 if (rate > 110)
1490                         have_higher_than_11mbit = true;
1491
1492                 for (j = 0; j < sband->n_bitrates; j++) {
1493                         if (sband->bitrates[j].bitrate == rate) {
1494                                 rates |= BIT(j);
1495                                 if (is_basic)
1496                                         basic_rates |= BIT(j);
1497                                 break;
1498                         }
1499                 }
1500         }
1501
1502         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1503                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1504                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1505
1506                 if (rate > 110)
1507                         have_higher_than_11mbit = true;
1508
1509                 for (j = 0; j < sband->n_bitrates; j++) {
1510                         if (sband->bitrates[j].bitrate == rate) {
1511                                 rates |= BIT(j);
1512                                 if (is_basic)
1513                                         basic_rates |= BIT(j);
1514                                 break;
1515                         }
1516                 }
1517         }
1518
1519         sta->sta.supp_rates[wk->chan->band] = rates;
1520         sdata->vif.bss_conf.basic_rates = basic_rates;
1521
1522         /* cf. IEEE 802.11 9.2.12 */
1523         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1524             have_higher_than_11mbit)
1525                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1526         else
1527                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1528
1529         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1530                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1531                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1532
1533         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1534
1535         rate_control_rate_init(sta);
1536
1537         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1538                 set_sta_flags(sta, WLAN_STA_MFP);
1539
1540         if (elems.wmm_param)
1541                 set_sta_flags(sta, WLAN_STA_WME);
1542
1543         err = sta_info_insert(sta);
1544         sta = NULL;
1545         if (err) {
1546                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1547                        " the AP (error %d)\n", sdata->name, err);
1548                 return false;
1549         }
1550
1551         /*
1552          * Always handle WMM once after association regardless
1553          * of the first value the AP uses. Setting -1 here has
1554          * that effect because the AP values is an unsigned
1555          * 4-bit value.
1556          */
1557         ifmgd->wmm_last_param_set = -1;
1558
1559         if (elems.wmm_param)
1560                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1561                                          elems.wmm_param_len);
1562         else
1563                 ieee80211_set_wmm_default(sdata);
1564
1565         local->oper_channel = wk->chan;
1566
1567         if (elems.ht_info_elem && elems.wmm_param &&
1568             (sdata->local->hw.queues >= 4) &&
1569             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1570                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1571                                                cbss->bssid, ap_ht_cap_flags);
1572
1573         /* set AID and assoc capability,
1574          * ieee80211_set_associated() will tell the driver */
1575         bss_conf->aid = aid;
1576         bss_conf->assoc_capability = capab_info;
1577         ieee80211_set_associated(sdata, cbss, changed);
1578
1579         /*
1580          * If we're using 4-addr mode, let the AP know that we're
1581          * doing so, so that it can create the STA VLAN on its side
1582          */
1583         if (ifmgd->use_4addr)
1584                 ieee80211_send_4addr_nullfunc(local, sdata);
1585
1586         /*
1587          * Start timer to probe the connection to the AP now.
1588          * Also start the timer that will detect beacon loss.
1589          */
1590         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1591         ieee80211_sta_reset_beacon_monitor(sdata);
1592
1593         return true;
1594 }
1595
1596
1597 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1598                                   struct ieee80211_mgmt *mgmt,
1599                                   size_t len,
1600                                   struct ieee80211_rx_status *rx_status,
1601                                   struct ieee802_11_elems *elems,
1602                                   bool beacon)
1603 {
1604         struct ieee80211_local *local = sdata->local;
1605         int freq;
1606         struct ieee80211_bss *bss;
1607         struct ieee80211_channel *channel;
1608         bool need_ps = false;
1609
1610         if (sdata->u.mgd.associated) {
1611                 bss = (void *)sdata->u.mgd.associated->priv;
1612                 /* not previously set so we may need to recalc */
1613                 need_ps = !bss->dtim_period;
1614         }
1615
1616         if (elems->ds_params && elems->ds_params_len == 1)
1617                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1618                                                       rx_status->band);
1619         else
1620                 freq = rx_status->freq;
1621
1622         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1623
1624         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1625                 return;
1626
1627         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1628                                         channel, beacon);
1629         if (bss)
1630                 ieee80211_rx_bss_put(local, bss);
1631
1632         if (!sdata->u.mgd.associated)
1633                 return;
1634
1635         if (need_ps) {
1636                 mutex_lock(&local->iflist_mtx);
1637                 ieee80211_recalc_ps(local, -1);
1638                 mutex_unlock(&local->iflist_mtx);
1639         }
1640
1641         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1642             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1643                                                         ETH_ALEN) == 0)) {
1644                 struct ieee80211_channel_sw_ie *sw_elem =
1645                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1646                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1647                                                  bss, rx_status->mactime);
1648         }
1649 }
1650
1651
1652 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1653                                          struct sk_buff *skb)
1654 {
1655         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1656         struct ieee80211_if_managed *ifmgd;
1657         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1658         size_t baselen, len = skb->len;
1659         struct ieee802_11_elems elems;
1660
1661         ifmgd = &sdata->u.mgd;
1662
1663         ASSERT_MGD_MTX(ifmgd);
1664
1665         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1666                 return; /* ignore ProbeResp to foreign address */
1667
1668         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1669         if (baselen > len)
1670                 return;
1671
1672         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1673                                 &elems);
1674
1675         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1676
1677         if (ifmgd->associated &&
1678             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1679                 ieee80211_reset_ap_probe(sdata);
1680 }
1681
1682 /*
1683  * This is the canonical list of information elements we care about,
1684  * the filter code also gives us all changes to the Microsoft OUI
1685  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1686  *
1687  * We implement beacon filtering in software since that means we can
1688  * avoid processing the frame here and in cfg80211, and userspace
1689  * will not be able to tell whether the hardware supports it or not.
1690  *
1691  * XXX: This list needs to be dynamic -- userspace needs to be able to
1692  *      add items it requires. It also needs to be able to tell us to
1693  *      look out for other vendor IEs.
1694  */
1695 static const u64 care_about_ies =
1696         (1ULL << WLAN_EID_COUNTRY) |
1697         (1ULL << WLAN_EID_ERP_INFO) |
1698         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1699         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1700         (1ULL << WLAN_EID_HT_CAPABILITY) |
1701         (1ULL << WLAN_EID_HT_INFORMATION);
1702
1703 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1704                                      struct ieee80211_mgmt *mgmt,
1705                                      size_t len,
1706                                      struct ieee80211_rx_status *rx_status)
1707 {
1708         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1709         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1710         size_t baselen;
1711         struct ieee802_11_elems elems;
1712         struct ieee80211_local *local = sdata->local;
1713         u32 changed = 0;
1714         bool erp_valid, directed_tim = false;
1715         u8 erp_value = 0;
1716         u32 ncrc;
1717         u8 *bssid;
1718
1719         ASSERT_MGD_MTX(ifmgd);
1720
1721         /* Process beacon from the current BSS */
1722         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1723         if (baselen > len)
1724                 return;
1725
1726         if (rx_status->freq != local->hw.conf.channel->center_freq)
1727                 return;
1728
1729         /*
1730          * We might have received a number of frames, among them a
1731          * disassoc frame and a beacon...
1732          */
1733         if (!ifmgd->associated)
1734                 return;
1735
1736         bssid = ifmgd->associated->bssid;
1737
1738         /*
1739          * And in theory even frames from a different AP we were just
1740          * associated to a split-second ago!
1741          */
1742         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1743                 return;
1744
1745         /* Track average RSSI from the Beacon frames of the current AP */
1746         ifmgd->last_beacon_signal = rx_status->signal;
1747         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1748                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1749                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1750                 ifmgd->last_cqm_event_signal = 0;
1751                 ifmgd->count_beacon_signal = 1;
1752         } else {
1753                 ifmgd->ave_beacon_signal =
1754                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1755                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1756                          ifmgd->ave_beacon_signal) / 16;
1757                 ifmgd->count_beacon_signal++;
1758         }
1759         if (bss_conf->cqm_rssi_thold &&
1760             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1761             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1762                 int sig = ifmgd->ave_beacon_signal / 16;
1763                 int last_event = ifmgd->last_cqm_event_signal;
1764                 int thold = bss_conf->cqm_rssi_thold;
1765                 int hyst = bss_conf->cqm_rssi_hyst;
1766                 if (sig < thold &&
1767                     (last_event == 0 || sig < last_event - hyst)) {
1768                         ifmgd->last_cqm_event_signal = sig;
1769                         ieee80211_cqm_rssi_notify(
1770                                 &sdata->vif,
1771                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1772                                 GFP_KERNEL);
1773                 } else if (sig > thold &&
1774                            (last_event == 0 || sig > last_event + hyst)) {
1775                         ifmgd->last_cqm_event_signal = sig;
1776                         ieee80211_cqm_rssi_notify(
1777                                 &sdata->vif,
1778                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1779                                 GFP_KERNEL);
1780                 }
1781         }
1782
1783         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1784 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1785                 if (net_ratelimit()) {
1786                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1787                                "to a received beacon\n", sdata->name);
1788                 }
1789 #endif
1790                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1791                 mutex_lock(&local->iflist_mtx);
1792                 ieee80211_recalc_ps(local, -1);
1793                 mutex_unlock(&local->iflist_mtx);
1794         }
1795
1796         /*
1797          * Push the beacon loss detection into the future since
1798          * we are processing a beacon from the AP just now.
1799          */
1800         ieee80211_sta_reset_beacon_monitor(sdata);
1801
1802         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1803         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1804                                           len - baselen, &elems,
1805                                           care_about_ies, ncrc);
1806
1807         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1808                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1809                                                    ifmgd->aid);
1810
1811         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1812                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1813                                       true);
1814
1815                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1816                                          elems.wmm_param_len);
1817         }
1818
1819         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1820                 if (directed_tim) {
1821                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1822                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1823                                 ieee80211_hw_config(local,
1824                                                     IEEE80211_CONF_CHANGE_PS);
1825                                 ieee80211_send_nullfunc(local, sdata, 0);
1826                         } else {
1827                                 local->pspolling = true;
1828
1829                                 /*
1830                                  * Here is assumed that the driver will be
1831                                  * able to send ps-poll frame and receive a
1832                                  * response even though power save mode is
1833                                  * enabled, but some drivers might require
1834                                  * to disable power save here. This needs
1835                                  * to be investigated.
1836                                  */
1837                                 ieee80211_send_pspoll(local, sdata);
1838                         }
1839                 }
1840         }
1841
1842         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1843                 return;
1844         ifmgd->beacon_crc = ncrc;
1845         ifmgd->beacon_crc_valid = true;
1846
1847         if (elems.erp_info && elems.erp_info_len >= 1) {
1848                 erp_valid = true;
1849                 erp_value = elems.erp_info[0];
1850         } else {
1851                 erp_valid = false;
1852         }
1853         changed |= ieee80211_handle_bss_capability(sdata,
1854                         le16_to_cpu(mgmt->u.beacon.capab_info),
1855                         erp_valid, erp_value);
1856
1857
1858         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1859             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1860                 struct sta_info *sta;
1861                 struct ieee80211_supported_band *sband;
1862                 u16 ap_ht_cap_flags;
1863
1864                 rcu_read_lock();
1865
1866                 sta = sta_info_get(sdata, bssid);
1867                 if (WARN_ON(!sta)) {
1868                         rcu_read_unlock();
1869                         return;
1870                 }
1871
1872                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1873
1874                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1875                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1876
1877                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1878
1879                 rcu_read_unlock();
1880
1881                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1882                                                bssid, ap_ht_cap_flags);
1883         }
1884
1885         /* Note: country IE parsing is done for us by cfg80211 */
1886         if (elems.country_elem) {
1887                 /* TODO: IBSS also needs this */
1888                 if (elems.pwr_constr_elem)
1889                         ieee80211_handle_pwr_constr(sdata,
1890                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1891                                 elems.pwr_constr_elem,
1892                                 elems.pwr_constr_elem_len);
1893         }
1894
1895         ieee80211_bss_info_change_notify(sdata, changed);
1896 }
1897
1898 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1899                                   struct sk_buff *skb)
1900 {
1901         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1902         struct ieee80211_rx_status *rx_status;
1903         struct ieee80211_mgmt *mgmt;
1904         enum rx_mgmt_action rma = RX_MGMT_NONE;
1905         u16 fc;
1906
1907         rx_status = (struct ieee80211_rx_status *) skb->cb;
1908         mgmt = (struct ieee80211_mgmt *) skb->data;
1909         fc = le16_to_cpu(mgmt->frame_control);
1910
1911         mutex_lock(&ifmgd->mtx);
1912
1913         if (ifmgd->associated &&
1914             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1915                 switch (fc & IEEE80211_FCTL_STYPE) {
1916                 case IEEE80211_STYPE_BEACON:
1917                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1918                                                  rx_status);
1919                         break;
1920                 case IEEE80211_STYPE_PROBE_RESP:
1921                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1922                         break;
1923                 case IEEE80211_STYPE_DEAUTH:
1924                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1925                         break;
1926                 case IEEE80211_STYPE_DISASSOC:
1927                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1928                         break;
1929                 case IEEE80211_STYPE_ACTION:
1930                         switch (mgmt->u.action.category) {
1931                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1932                                 ieee80211_sta_process_chanswitch(sdata,
1933                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1934                                                 (void *)ifmgd->associated->priv,
1935                                                 rx_status->mactime);
1936                                 break;
1937                         }
1938                 }
1939                 mutex_unlock(&ifmgd->mtx);
1940
1941                 switch (rma) {
1942                 case RX_MGMT_NONE:
1943                         /* no action */
1944                         break;
1945                 case RX_MGMT_CFG80211_DEAUTH:
1946                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1947                         break;
1948                 case RX_MGMT_CFG80211_DISASSOC:
1949                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1950                         break;
1951                 default:
1952                         WARN(1, "unexpected: %d", rma);
1953                 }
1954                 return;
1955         }
1956
1957         mutex_unlock(&ifmgd->mtx);
1958
1959         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1960             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1961                 struct ieee80211_local *local = sdata->local;
1962                 struct ieee80211_work *wk;
1963
1964                 mutex_lock(&local->mtx);
1965                 list_for_each_entry(wk, &local->work_list, list) {
1966                         if (wk->sdata != sdata)
1967                                 continue;
1968
1969                         if (wk->type != IEEE80211_WORK_ASSOC &&
1970                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1971                                 continue;
1972
1973                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1974                                 continue;
1975                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1976                                 continue;
1977
1978                         /*
1979                          * Printing the message only here means we can't
1980                          * spuriously print it, but it also means that it
1981                          * won't be printed when the frame comes in before
1982                          * we even tried to associate or in similar cases.
1983                          *
1984                          * Ultimately, I suspect cfg80211 should print the
1985                          * messages instead.
1986                          */
1987                         printk(KERN_DEBUG
1988                                "%s: deauthenticated from %pM (Reason: %u)\n",
1989                                sdata->name, mgmt->bssid,
1990                                le16_to_cpu(mgmt->u.deauth.reason_code));
1991
1992                         list_del_rcu(&wk->list);
1993                         free_work(wk);
1994                         break;
1995                 }
1996                 mutex_unlock(&local->mtx);
1997
1998                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1999         }
2000 }
2001
2002 static void ieee80211_sta_timer(unsigned long data)
2003 {
2004         struct ieee80211_sub_if_data *sdata =
2005                 (struct ieee80211_sub_if_data *) data;
2006         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2007         struct ieee80211_local *local = sdata->local;
2008
2009         if (local->quiescing) {
2010                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2011                 return;
2012         }
2013
2014         ieee80211_queue_work(&local->hw, &sdata->work);
2015 }
2016
2017 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2018                                           u8 *bssid)
2019 {
2020         struct ieee80211_local *local = sdata->local;
2021         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2022
2023         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2024                           IEEE80211_STA_BEACON_POLL);
2025
2026         ieee80211_set_disassoc(sdata, true, true);
2027         mutex_unlock(&ifmgd->mtx);
2028         mutex_lock(&local->mtx);
2029         ieee80211_recalc_idle(local);
2030         mutex_unlock(&local->mtx);
2031         /*
2032          * must be outside lock due to cfg80211,
2033          * but that's not a problem.
2034          */
2035         ieee80211_send_deauth_disassoc(sdata, bssid,
2036                         IEEE80211_STYPE_DEAUTH,
2037                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2038                         NULL, true);
2039         mutex_lock(&ifmgd->mtx);
2040 }
2041
2042 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2043 {
2044         struct ieee80211_local *local = sdata->local;
2045         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2046
2047         /* then process the rest of the work */
2048         mutex_lock(&ifmgd->mtx);
2049
2050         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2051                             IEEE80211_STA_CONNECTION_POLL) &&
2052             ifmgd->associated) {
2053                 u8 bssid[ETH_ALEN];
2054                 int max_tries;
2055
2056                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2057
2058                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2059                         max_tries = max_nullfunc_tries;
2060                 else
2061                         max_tries = max_probe_tries;
2062
2063                 /* ACK received for nullfunc probing frame */
2064                 if (!ifmgd->probe_send_count)
2065                         ieee80211_reset_ap_probe(sdata);
2066                 else if (ifmgd->nullfunc_failed) {
2067                         if (ifmgd->probe_send_count < max_tries) {
2068 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2069                                 wiphy_debug(local->hw.wiphy,
2070                                             "%s: No ack for nullfunc frame to"
2071                                             " AP %pM, try %d/%i\n",
2072                                             sdata->name, bssid,
2073                                             ifmgd->probe_send_count, max_tries);
2074 #endif
2075                                 ieee80211_mgd_probe_ap_send(sdata);
2076                         } else {
2077 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2078                                 wiphy_debug(local->hw.wiphy,
2079                                             "%s: No ack for nullfunc frame to"
2080                                             " AP %pM, disconnecting.\n",
2081                                             sdata->name, bssid);
2082 #endif
2083                                 ieee80211_sta_connection_lost(sdata, bssid);
2084                         }
2085                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2086                         run_again(ifmgd, ifmgd->probe_timeout);
2087                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2088 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2089                         wiphy_debug(local->hw.wiphy,
2090                                     "%s: Failed to send nullfunc to AP %pM"
2091                                     " after %dms, disconnecting.\n",
2092                                     sdata->name,
2093                                     bssid, probe_wait_ms);
2094 #endif
2095                         ieee80211_sta_connection_lost(sdata, bssid);
2096                 } else if (ifmgd->probe_send_count < max_tries) {
2097 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2098                         wiphy_debug(local->hw.wiphy,
2099                                     "%s: No probe response from AP %pM"
2100                                     " after %dms, try %d/%i\n",
2101                                     sdata->name,
2102                                     bssid, probe_wait_ms,
2103                                     ifmgd->probe_send_count, max_tries);
2104 #endif
2105                         ieee80211_mgd_probe_ap_send(sdata);
2106                 } else {
2107                         /*
2108                          * We actually lost the connection ... or did we?
2109                          * Let's make sure!
2110                          */
2111                         wiphy_debug(local->hw.wiphy,
2112                                     "%s: No probe response from AP %pM"
2113                                     " after %dms, disconnecting.\n",
2114                                     sdata->name,
2115                                     bssid, probe_wait_ms);
2116
2117                         ieee80211_sta_connection_lost(sdata, bssid);
2118                 }
2119         }
2120
2121         mutex_unlock(&ifmgd->mtx);
2122 }
2123
2124 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2125 {
2126         struct ieee80211_sub_if_data *sdata =
2127                 (struct ieee80211_sub_if_data *) data;
2128         struct ieee80211_local *local = sdata->local;
2129
2130         if (local->quiescing)
2131                 return;
2132
2133         ieee80211_queue_work(&sdata->local->hw,
2134                              &sdata->u.mgd.beacon_connection_loss_work);
2135 }
2136
2137 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2138 {
2139         struct ieee80211_sub_if_data *sdata =
2140                 (struct ieee80211_sub_if_data *) data;
2141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2142         struct ieee80211_local *local = sdata->local;
2143
2144         if (local->quiescing)
2145                 return;
2146
2147         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2148 }
2149
2150 static void ieee80211_sta_monitor_work(struct work_struct *work)
2151 {
2152         struct ieee80211_sub_if_data *sdata =
2153                 container_of(work, struct ieee80211_sub_if_data,
2154                              u.mgd.monitor_work);
2155
2156         ieee80211_mgd_probe_ap(sdata, false);
2157 }
2158
2159 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2160 {
2161         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2162                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2163                                         IEEE80211_STA_CONNECTION_POLL);
2164
2165                 /* let's probe the connection once */
2166                 ieee80211_queue_work(&sdata->local->hw,
2167                            &sdata->u.mgd.monitor_work);
2168                 /* and do all the other regular work too */
2169                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2170         }
2171 }
2172
2173 #ifdef CONFIG_PM
2174 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2175 {
2176         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2177
2178         /*
2179          * we need to use atomic bitops for the running bits
2180          * only because both timers might fire at the same
2181          * time -- the code here is properly synchronised.
2182          */
2183
2184         cancel_work_sync(&ifmgd->request_smps_work);
2185
2186         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2187         if (del_timer_sync(&ifmgd->timer))
2188                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2189
2190         cancel_work_sync(&ifmgd->chswitch_work);
2191         if (del_timer_sync(&ifmgd->chswitch_timer))
2192                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2193
2194         cancel_work_sync(&ifmgd->monitor_work);
2195         /* these will just be re-established on connection */
2196         del_timer_sync(&ifmgd->conn_mon_timer);
2197         del_timer_sync(&ifmgd->bcn_mon_timer);
2198 }
2199
2200 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2201 {
2202         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2203
2204         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2205                 add_timer(&ifmgd->timer);
2206         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2207                 add_timer(&ifmgd->chswitch_timer);
2208         ieee80211_sta_reset_beacon_monitor(sdata);
2209         ieee80211_restart_sta_timer(sdata);
2210         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2211 }
2212 #endif
2213
2214 /* interface setup */
2215 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2216 {
2217         struct ieee80211_if_managed *ifmgd;
2218
2219         ifmgd = &sdata->u.mgd;
2220         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2221         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2222         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2223                   ieee80211_beacon_connection_loss_work);
2224         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2225         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2226                     (unsigned long) sdata);
2227         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2228                     (unsigned long) sdata);
2229         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2230                     (unsigned long) sdata);
2231         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2232                     (unsigned long) sdata);
2233
2234         ifmgd->flags = 0;
2235
2236         mutex_init(&ifmgd->mtx);
2237
2238         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2239                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2240         else
2241                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2242 }
2243
2244 /* scan finished notification */
2245 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2246 {
2247         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2248
2249         /* Restart STA timers */
2250         rcu_read_lock();
2251         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2252                 ieee80211_restart_sta_timer(sdata);
2253         rcu_read_unlock();
2254 }
2255
2256 int ieee80211_max_network_latency(struct notifier_block *nb,
2257                                   unsigned long data, void *dummy)
2258 {
2259         s32 latency_usec = (s32) data;
2260         struct ieee80211_local *local =
2261                 container_of(nb, struct ieee80211_local,
2262                              network_latency_notifier);
2263
2264         mutex_lock(&local->iflist_mtx);
2265         ieee80211_recalc_ps(local, latency_usec);
2266         mutex_unlock(&local->iflist_mtx);
2267
2268         return 0;
2269 }
2270
2271 /* config hooks */
2272 static enum work_done_result
2273 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2274                           struct sk_buff *skb)
2275 {
2276         if (!skb) {
2277                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2278                 return WORK_DONE_DESTROY;
2279         }
2280
2281         if (wk->type == IEEE80211_WORK_AUTH) {
2282                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2283                 return WORK_DONE_DESTROY;
2284         }
2285
2286         mutex_lock(&wk->sdata->u.mgd.mtx);
2287         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2288         mutex_unlock(&wk->sdata->u.mgd.mtx);
2289
2290         wk->type = IEEE80211_WORK_AUTH;
2291         wk->probe_auth.tries = 0;
2292         return WORK_DONE_REQUEUE;
2293 }
2294
2295 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2296                        struct cfg80211_auth_request *req)
2297 {
2298         const u8 *ssid;
2299         struct ieee80211_work *wk;
2300         u16 auth_alg;
2301
2302         if (req->local_state_change)
2303                 return 0; /* no need to update mac80211 state */
2304
2305         switch (req->auth_type) {
2306         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2307                 auth_alg = WLAN_AUTH_OPEN;
2308                 break;
2309         case NL80211_AUTHTYPE_SHARED_KEY:
2310                 if (IS_ERR(sdata->local->wep_tx_tfm))
2311                         return -EOPNOTSUPP;
2312                 auth_alg = WLAN_AUTH_SHARED_KEY;
2313                 break;
2314         case NL80211_AUTHTYPE_FT:
2315                 auth_alg = WLAN_AUTH_FT;
2316                 break;
2317         case NL80211_AUTHTYPE_NETWORK_EAP:
2318                 auth_alg = WLAN_AUTH_LEAP;
2319                 break;
2320         default:
2321                 return -EOPNOTSUPP;
2322         }
2323
2324         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2325         if (!wk)
2326                 return -ENOMEM;
2327
2328         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2329
2330         if (req->ie && req->ie_len) {
2331                 memcpy(wk->ie, req->ie, req->ie_len);
2332                 wk->ie_len = req->ie_len;
2333         }
2334
2335         if (req->key && req->key_len) {
2336                 wk->probe_auth.key_len = req->key_len;
2337                 wk->probe_auth.key_idx = req->key_idx;
2338                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2339         }
2340
2341         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2342         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2343         wk->probe_auth.ssid_len = ssid[1];
2344
2345         wk->probe_auth.algorithm = auth_alg;
2346         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2347
2348         /* if we already have a probe, don't probe again */
2349         if (req->bss->proberesp_ies)
2350                 wk->type = IEEE80211_WORK_AUTH;
2351         else
2352                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2353         wk->chan = req->bss->channel;
2354         wk->chan_type = NL80211_CHAN_NO_HT;
2355         wk->sdata = sdata;
2356         wk->done = ieee80211_probe_auth_done;
2357
2358         ieee80211_add_work(wk);
2359         return 0;
2360 }
2361
2362 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2363                                                   struct sk_buff *skb)
2364 {
2365         struct ieee80211_mgmt *mgmt;
2366         struct ieee80211_rx_status *rx_status;
2367         struct ieee802_11_elems elems;
2368         u16 status;
2369
2370         if (!skb) {
2371                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2372                 return WORK_DONE_DESTROY;
2373         }
2374
2375         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2376                 mutex_lock(&wk->sdata->u.mgd.mtx);
2377                 rx_status = (void *) skb->cb;
2378                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2379                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2380                                       &elems, true);
2381                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2382
2383                 wk->type = IEEE80211_WORK_ASSOC;
2384                 /* not really done yet */
2385                 return WORK_DONE_REQUEUE;
2386         }
2387
2388         mgmt = (void *)skb->data;
2389         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2390
2391         if (status == WLAN_STATUS_SUCCESS) {
2392                 mutex_lock(&wk->sdata->u.mgd.mtx);
2393                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2394                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2395                         /* oops -- internal error -- send timeout for now */
2396                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2397                                                     wk->filter_ta);
2398                         return WORK_DONE_DESTROY;
2399                 }
2400
2401                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2402         }
2403
2404         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2405         return WORK_DONE_DESTROY;
2406 }
2407
2408 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2409                         struct cfg80211_assoc_request *req)
2410 {
2411         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2412         struct ieee80211_bss *bss = (void *)req->bss->priv;
2413         struct ieee80211_work *wk;
2414         const u8 *ssid;
2415         int i;
2416
2417         mutex_lock(&ifmgd->mtx);
2418         if (ifmgd->associated) {
2419                 if (!req->prev_bssid ||
2420                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2421                            ETH_ALEN)) {
2422                         /*
2423                          * We are already associated and the request was not a
2424                          * reassociation request from the current BSS, so
2425                          * reject it.
2426                          */
2427                         mutex_unlock(&ifmgd->mtx);
2428                         return -EALREADY;
2429                 }
2430
2431                 /* Trying to reassociate - clear previous association state */
2432                 ieee80211_set_disassoc(sdata, true, false);
2433         }
2434         mutex_unlock(&ifmgd->mtx);
2435
2436         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2437         if (!wk)
2438                 return -ENOMEM;
2439
2440         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2441         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2442
2443         ifmgd->beacon_crc_valid = false;
2444
2445         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2446                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2447                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2448                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2449                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2450
2451
2452         if (req->ie && req->ie_len) {
2453                 memcpy(wk->ie, req->ie, req->ie_len);
2454                 wk->ie_len = req->ie_len;
2455         } else
2456                 wk->ie_len = 0;
2457
2458         wk->assoc.bss = req->bss;
2459
2460         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2461
2462         /* new association always uses requested smps mode */
2463         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2464                 if (ifmgd->powersave)
2465                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2466                 else
2467                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2468         } else
2469                 ifmgd->ap_smps = ifmgd->req_smps;
2470
2471         wk->assoc.smps = ifmgd->ap_smps;
2472         /*
2473          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2474          * We still associate in non-HT mode (11a/b/g) if any one of these
2475          * ciphers is configured as pairwise.
2476          * We can set this to true for non-11n hardware, that'll be checked
2477          * separately along with the peer capabilities.
2478          */
2479         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2480         wk->assoc.capability = req->bss->capability;
2481         wk->assoc.wmm_used = bss->wmm_used;
2482         wk->assoc.supp_rates = bss->supp_rates;
2483         wk->assoc.supp_rates_len = bss->supp_rates_len;
2484         wk->assoc.ht_information_ie =
2485                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2486
2487         if (bss->wmm_used && bss->uapsd_supported &&
2488             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2489                 wk->assoc.uapsd_used = true;
2490                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2491         } else {
2492                 wk->assoc.uapsd_used = false;
2493                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2494         }
2495
2496         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2497         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2498         wk->assoc.ssid_len = ssid[1];
2499
2500         if (req->prev_bssid)
2501                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2502
2503         wk->chan = req->bss->channel;
2504         wk->chan_type = NL80211_CHAN_NO_HT;
2505         wk->sdata = sdata;
2506         wk->done = ieee80211_assoc_done;
2507         if (!bss->dtim_period &&
2508             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2509                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2510         else
2511                 wk->type = IEEE80211_WORK_ASSOC;
2512
2513         if (req->use_mfp) {
2514                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2515                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2516         } else {
2517                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2518                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2519         }
2520
2521         if (req->crypto.control_port)
2522                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2523         else
2524                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2525
2526         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2527         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2528
2529         ieee80211_add_work(wk);
2530         return 0;
2531 }
2532
2533 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2534                          struct cfg80211_deauth_request *req,
2535                          void *cookie)
2536 {
2537         struct ieee80211_local *local = sdata->local;
2538         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2539         struct ieee80211_work *wk;
2540         u8 bssid[ETH_ALEN];
2541         bool assoc_bss = false;
2542
2543         mutex_lock(&ifmgd->mtx);
2544
2545         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2546         if (ifmgd->associated == req->bss) {
2547                 ieee80211_set_disassoc(sdata, false, true);
2548                 mutex_unlock(&ifmgd->mtx);
2549                 assoc_bss = true;
2550         } else {
2551                 bool not_auth_yet = false;
2552
2553                 mutex_unlock(&ifmgd->mtx);
2554
2555                 mutex_lock(&local->mtx);
2556                 list_for_each_entry(wk, &local->work_list, list) {
2557                         if (wk->sdata != sdata)
2558                                 continue;
2559
2560                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2561                             wk->type != IEEE80211_WORK_AUTH &&
2562                             wk->type != IEEE80211_WORK_ASSOC &&
2563                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2564                                 continue;
2565
2566                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2567                                 continue;
2568
2569                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2570                         list_del_rcu(&wk->list);
2571                         free_work(wk);
2572                         break;
2573                 }
2574                 mutex_unlock(&local->mtx);
2575
2576                 /*
2577                  * If somebody requests authentication and we haven't
2578                  * sent out an auth frame yet there's no need to send
2579                  * out a deauth frame either. If the state was PROBE,
2580                  * then this is the case. If it's AUTH we have sent a
2581                  * frame, and if it's IDLE we have completed the auth
2582                  * process already.
2583                  */
2584                 if (not_auth_yet) {
2585                         __cfg80211_auth_canceled(sdata->dev, bssid);
2586                         return 0;
2587                 }
2588         }
2589
2590         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2591                sdata->name, bssid, req->reason_code);
2592
2593         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2594                                        req->reason_code, cookie,
2595                                        !req->local_state_change);
2596         if (assoc_bss)
2597                 sta_info_destroy_addr(sdata, bssid);
2598
2599         mutex_lock(&sdata->local->mtx);
2600         ieee80211_recalc_idle(sdata->local);
2601         mutex_unlock(&sdata->local->mtx);
2602
2603         return 0;
2604 }
2605
2606 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2607                            struct cfg80211_disassoc_request *req,
2608                            void *cookie)
2609 {
2610         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2611         u8 bssid[ETH_ALEN];
2612
2613         mutex_lock(&ifmgd->mtx);
2614
2615         /*
2616          * cfg80211 should catch this ... but it's racy since
2617          * we can receive a disassoc frame, process it, hand it
2618          * to cfg80211 while that's in a locked section already
2619          * trying to tell us that the user wants to disconnect.
2620          */
2621         if (ifmgd->associated != req->bss) {
2622                 mutex_unlock(&ifmgd->mtx);
2623                 return -ENOLINK;
2624         }
2625
2626         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2627                sdata->name, req->bss->bssid, req->reason_code);
2628
2629         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2630         ieee80211_set_disassoc(sdata, false, true);
2631
2632         mutex_unlock(&ifmgd->mtx);
2633
2634         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2635                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2636                         cookie, !req->local_state_change);
2637         sta_info_destroy_addr(sdata, bssid);
2638
2639         mutex_lock(&sdata->local->mtx);
2640         ieee80211_recalc_idle(sdata->local);
2641         mutex_unlock(&sdata->local->mtx);
2642
2643         return 0;
2644 }
2645
2646 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2647                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2648                                gfp_t gfp)
2649 {
2650         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2651
2652         trace_api_cqm_rssi_notify(sdata, rssi_event);
2653
2654         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2655 }
2656 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2657
2658 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2659 {
2660         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2661         return sdata->dev->operstate;
2662 }
2663 EXPORT_SYMBOL(ieee80211_get_operstate);