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  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * Weight given to the latest Beacon frame when calculating average signal
  85  * strength for Beacon frames received in the current BSS. This must be
  86  * between 1 and 15.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  89
  90 /*
  91  * How many Beacon frames need to have been used in average signal strength
  92  * before starting to indicate signal change events.
  93  */
  94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  95
  96 /*
  97  * We can have multiple work items (and connection probing)
  98  * scheduling this timer, but we need to take care to only
  99  * reschedule it when it should fire _earlier_ than it was
 100  * asked for before, or if it's not pending right now. This
 101  * function ensures that. Note that it then is required to
 102  * run this function for all timeouts after the first one
 103  * has happened -- the work that runs from this timer will
 104  * do that.
 105  */
 106 static void run_again(struct ieee80211_sub_if_data *sdata,
 107                       unsigned long timeout)
 108 {
 109         sdata_assert_lock(sdata);
 110
 111         if (!timer_pending(&sdata->u.mgd.timer) ||
 112             time_before(timeout, sdata->u.mgd.timer.expires))
 113                 mod_timer(&sdata->u.mgd.timer, timeout);
 114 }
 115
 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 117 {
 118         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 119                 return;
 120
 121         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 122                 return;
 123
 124         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 125                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 126 }
 127
 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 131
 132         if (unlikely(!sdata->u.mgd.associated))
 133                 return;
 134
 135         ifmgd->probe_send_count = 0;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142 }
 143
 144 static int ecw2cw(int ecw)
 145 {
 146         return (1 << ecw) - 1;
 147 }
 148
 149 static u32
 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 151                              struct ieee80211_supported_band *sband,
 152                              struct ieee80211_channel *channel,
 153                              const struct ieee80211_ht_cap *ht_cap,
 154                              const struct ieee80211_ht_operation *ht_oper,
 155                              const struct ieee80211_vht_operation *vht_oper,
 156                              struct cfg80211_chan_def *chandef, bool tracking)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159         struct cfg80211_chan_def vht_chandef;
 160         u32 ht_cfreq, ret;
 161
 162         chandef->chan = channel;
 163         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 164         chandef->center_freq1 = channel->center_freq;
 165         chandef->center_freq2 = 0;
 166
 167         if (!ht_cap || !ht_oper || !sband->ht_cap.ht_supported) {
 168                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 169                 goto out;
 170         }
 171
 172         chandef->width = NL80211_CHAN_WIDTH_20;
 173
 174         if (!(ht_cap->cap_info &
 175               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 176                 ret = IEEE80211_STA_DISABLE_40MHZ;
 177                 goto out;
 178         }
 179
 180         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 181                                                   channel->band);
 182         /* check that channel matches the right operating channel */
 183         if (!tracking && channel->center_freq != ht_cfreq) {
 184                 /*
 185                  * It's possible that some APs are confused here;
 186                  * Netgear WNDR3700 sometimes reports 4 higher than
 187                  * the actual channel in association responses, but
 188                  * since we look at probe response/beacon data here
 189                  * it should be OK.
 190                  */
 191                 sdata_info(sdata,
 192                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 193                            channel->center_freq, ht_cfreq,
 194                            ht_oper->primary_chan, channel->band);
 195                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 196                 goto out;
 197         }
 198
 199         /* check 40 MHz support, if we have it */
 200         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 201                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 202                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 203                         chandef->width = NL80211_CHAN_WIDTH_40;
 204                         chandef->center_freq1 += 10;
 205                         break;
 206                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 207                         chandef->width = NL80211_CHAN_WIDTH_40;
 208                         chandef->center_freq1 -= 10;
 209                         break;
 210                 }
 211         } else {
 212                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 213                 ret = IEEE80211_STA_DISABLE_VHT;
 214                 /* also mark 40 MHz disabled */
 215                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 216                 goto out;
 217         }
 218
 219         if (!vht_oper || !sband->vht_cap.vht_supported) {
 220                 ret = IEEE80211_STA_DISABLE_VHT;
 221                 goto out;
 222         }
 223
 224         vht_chandef.chan = channel;
 225         vht_chandef.center_freq1 =
 226                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 227                                                channel->band);
 228         vht_chandef.center_freq2 = 0;
 229
 230         switch (vht_oper->chan_width) {
 231         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 232                 vht_chandef.width = chandef->width;
 233                 vht_chandef.center_freq1 = chandef->center_freq1;
 234                 break;
 235         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 236                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 237                 break;
 238         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 239                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 240                 break;
 241         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 242                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 243                 vht_chandef.center_freq2 =
 244                         ieee80211_channel_to_frequency(
 245                                 vht_oper->center_freq_seg2_idx,
 246                                 channel->band);
 247                 break;
 248         default:
 249                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 250                         sdata_info(sdata,
 251                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 252                                    vht_oper->chan_width);
 253                 ret = IEEE80211_STA_DISABLE_VHT;
 254                 goto out;
 255         }
 256
 257         if (!cfg80211_chandef_valid(&vht_chandef)) {
 258                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 259                         sdata_info(sdata,
 260                                    "AP VHT information is invalid, disable VHT\n");
 261                 ret = IEEE80211_STA_DISABLE_VHT;
 262                 goto out;
 263         }
 264
 265         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 266                 ret = 0;
 267                 goto out;
 268         }
 269
 270         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 271                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 272                         sdata_info(sdata,
 273                                    "AP VHT information doesn't match HT, disable VHT\n");
 274                 ret = IEEE80211_STA_DISABLE_VHT;
 275                 goto out;
 276         }
 277
 278         *chandef = vht_chandef;
 279
 280         ret = 0;
 281
 282 out:
 283         /*
 284          * When tracking the current AP, don't do any further checks if the
 285          * new chandef is identical to the one we're currently using for the
 286          * connection. This keeps us from playing ping-pong with regulatory,
 287          * without it the following can happen (for example):
 288          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 289          *  - AP advertises regdom US
 290          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 291          *  - the code below detects an unsupported channel, downgrades, and
 292          *    we disconnect from the AP in the caller
 293          *  - disconnect causes CRDA to reload world regdomain and the game
 294          *    starts anew.
 295          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 296          *
 297          * It seems possible that there are still scenarios with CSA or real
 298          * bandwidth changes where a this could happen, but those cases are
 299          * less common and wouldn't completely prevent using the AP.
 300          */
 301         if (tracking &&
 302             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 303                 return ret;
 304
 305         /* don't print the message below for VHT mismatch if VHT is disabled */
 306         if (ret & IEEE80211_STA_DISABLE_VHT)
 307                 vht_chandef = *chandef;
 308
 309         /*
 310          * Ignore the DISABLED flag when we're already connected and only
 311          * tracking the APs beacon for bandwidth changes - otherwise we
 312          * might get disconnected here if we connect to an AP, update our
 313          * regulatory information based on the AP's country IE and the
 314          * information we have is wrong/outdated and disables the channel
 315          * that we're actually using for the connection to the AP.
 316          */
 317         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 318                                         tracking ? 0 :
 319                                                    IEEE80211_CHAN_DISABLED)) {
 320                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 321                         ret = IEEE80211_STA_DISABLE_HT |
 322                               IEEE80211_STA_DISABLE_VHT;
 323                         break;
 324                 }
 325
 326                 ret |= ieee80211_chandef_downgrade(chandef);
 327         }
 328
 329         if (chandef->width != vht_chandef.width && !tracking)
 330                 sdata_info(sdata,
 331                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 332
 333         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 334         return ret;
 335 }
 336
 337 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 338                                struct sta_info *sta,
 339                                const struct ieee80211_ht_cap *ht_cap,
 340                                const struct ieee80211_ht_operation *ht_oper,
 341                                const struct ieee80211_vht_operation *vht_oper,
 342                                const u8 *bssid, u32 *changed)
 343 {
 344         struct ieee80211_local *local = sdata->local;
 345         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 346         struct ieee80211_supported_band *sband;
 347         struct ieee80211_channel *chan;
 348         struct cfg80211_chan_def chandef;
 349         u16 ht_opmode;
 350         u32 flags;
 351         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 352         int ret;
 353
 354         /* if HT was/is disabled, don't track any bandwidth changes */
 355         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 356                 return 0;
 357
 358         /* don't check VHT if we associated as non-VHT station */
 359         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 360                 vht_oper = NULL;
 361
 362         if (WARN_ON_ONCE(!sta))
 363                 return -EINVAL;
 364
 365         /*
 366          * if bss configuration changed store the new one -
 367          * this may be applicable even if channel is identical
 368          */
 369         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 370         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 371                 *changed |= BSS_CHANGED_HT;
 372                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 373         }
 374
 375         chan = sdata->vif.bss_conf.chandef.chan;
 376         sband = local->hw.wiphy->bands[chan->band];
 377
 378         /* calculate new channel (type) based on HT/VHT operation IEs */
 379         flags = ieee80211_determine_chantype(sdata, sband, chan,
 380                                              ht_cap, ht_oper, vht_oper,
 381                                              &chandef, true);
 382
 383         /*
 384          * Downgrade the new channel if we associated with restricted
 385          * capabilities. For example, if we associated as a 20 MHz STA
 386          * to a 40 MHz AP (due to regulatory, capabilities or config
 387          * reasons) then switching to a 40 MHz channel now won't do us
 388          * any good -- we couldn't use it with the AP.
 389          */
 390         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 391             chandef.width == NL80211_CHAN_WIDTH_80P80)
 392                 flags |= ieee80211_chandef_downgrade(&chandef);
 393         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 394             chandef.width == NL80211_CHAN_WIDTH_160)
 395                 flags |= ieee80211_chandef_downgrade(&chandef);
 396         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 397             chandef.width > NL80211_CHAN_WIDTH_20)
 398                 flags |= ieee80211_chandef_downgrade(&chandef);
 399
 400         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 401                 return 0;
 402
 403         sdata_info(sdata,
 404                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 405                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 406                    chandef.center_freq1, chandef.center_freq2);
 407
 408         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 409                                       IEEE80211_STA_DISABLE_VHT |
 410                                       IEEE80211_STA_DISABLE_40MHZ |
 411                                       IEEE80211_STA_DISABLE_80P80MHZ |
 412                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 413             !cfg80211_chandef_valid(&chandef)) {
 414                 sdata_info(sdata,
 415                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 416                            ifmgd->bssid);
 417                 return -EINVAL;
 418         }
 419
 420         switch (chandef.width) {
 421         case NL80211_CHAN_WIDTH_20_NOHT:
 422         case NL80211_CHAN_WIDTH_20:
 423                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 424                 break;
 425         case NL80211_CHAN_WIDTH_40:
 426                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 427                 break;
 428         case NL80211_CHAN_WIDTH_80:
 429                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 430                 break;
 431         case NL80211_CHAN_WIDTH_80P80:
 432         case NL80211_CHAN_WIDTH_160:
 433                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 434                 break;
 435         default:
 436                 return -EINVAL;
 437         }
 438
 439         if (new_sta_bw > sta->cur_max_bandwidth)
 440                 new_sta_bw = sta->cur_max_bandwidth;
 441
 442         if (new_sta_bw < sta->sta.bandwidth) {
 443                 sta->sta.bandwidth = new_sta_bw;
 444                 rate_control_rate_update(local, sband, sta,
 445                                          IEEE80211_RC_BW_CHANGED);
 446         }
 447
 448         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 449         if (ret) {
 450                 sdata_info(sdata,
 451                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 452                            ifmgd->bssid);
 453                 return ret;
 454         }
 455
 456         if (new_sta_bw > sta->sta.bandwidth) {
 457                 sta->sta.bandwidth = new_sta_bw;
 458                 rate_control_rate_update(local, sband, sta,
 459                                          IEEE80211_RC_BW_CHANGED);
 460         }
 461
 462         return 0;
 463 }
 464
 465 /* frame sending functions */
 466
 467 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 468                                 struct sk_buff *skb, u8 ap_ht_param,
 469                                 struct ieee80211_supported_band *sband,
 470                                 struct ieee80211_channel *channel,
 471                                 enum ieee80211_smps_mode smps)
 472 {
 473         u8 *pos;
 474         u32 flags = channel->flags;
 475         u16 cap;
 476         struct ieee80211_sta_ht_cap ht_cap;
 477
 478         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 479
 480         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 481         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 482
 483         /* determine capability flags */
 484         cap = ht_cap.cap;
 485
 486         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 487         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 488                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 489                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 490                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 491                 }
 492                 break;
 493         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 494                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 495                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 496                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 497                 }
 498                 break;
 499         }
 500
 501         /*
 502          * If 40 MHz was disabled associate as though we weren't
 503          * capable of 40 MHz -- some broken APs will never fall
 504          * back to trying to transmit in 20 MHz.
 505          */
 506         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 507                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 508                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 509         }
 510
 511         /* set SM PS mode properly */
 512         cap &= ~IEEE80211_HT_CAP_SM_PS;
 513         switch (smps) {
 514         case IEEE80211_SMPS_AUTOMATIC:
 515         case IEEE80211_SMPS_NUM_MODES:
 516                 WARN_ON(1);
 517         case IEEE80211_SMPS_OFF:
 518                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 519                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 520                 break;
 521         case IEEE80211_SMPS_STATIC:
 522                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 523                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 524                 break;
 525         case IEEE80211_SMPS_DYNAMIC:
 526                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 527                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 528                 break;
 529         }
 530
 531         /* reserve and fill IE */
 532         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 533         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 534 }
 535
 536 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 537                                  struct sk_buff *skb,
 538                                  struct ieee80211_supported_band *sband,
 539                                  struct ieee80211_vht_cap *ap_vht_cap)
 540 {
 541         u8 *pos;
 542         u32 cap;
 543         struct ieee80211_sta_vht_cap vht_cap;
 544         u32 mask, ap_bf_sts, our_bf_sts;
 545
 546         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 547
 548         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 549         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 550
 551         /* determine capability flags */
 552         cap = vht_cap.cap;
 553
 554         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 555                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 556                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 557         }
 558
 559         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 560                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 561                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 562         }
 563
 564         /*
 565          * Some APs apparently get confused if our capabilities are better
 566          * than theirs, so restrict what we advertise in the assoc request.
 567          */
 568         if (!(ap_vht_cap->vht_cap_info &
 569                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 570                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 571
 572         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 573
 574         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 575         our_bf_sts = cap & mask;
 576
 577         if (ap_bf_sts < our_bf_sts) {
 578                 cap &= ~mask;
 579                 cap |= ap_bf_sts;
 580         }
 581
 582         /* reserve and fill IE */
 583         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 584         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 585 }
 586
 587 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 588 {
 589         struct ieee80211_local *local = sdata->local;
 590         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 591         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 592         struct sk_buff *skb;
 593         struct ieee80211_mgmt *mgmt;
 594         u8 *pos, qos_info;
 595         size_t offset = 0, noffset;
 596         int i, count, rates_len, supp_rates_len, shift;
 597         u16 capab;
 598         struct ieee80211_supported_band *sband;
 599         struct ieee80211_chanctx_conf *chanctx_conf;
 600         struct ieee80211_channel *chan;
 601         u32 rate_flags, rates = 0;
 602
 603         sdata_assert_lock(sdata);
 604
 605         rcu_read_lock();
 606         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 607         if (WARN_ON(!chanctx_conf)) {
 608                 rcu_read_unlock();
 609                 return;
 610         }
 611         chan = chanctx_conf->def.chan;
 612         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 613         rcu_read_unlock();
 614         sband = local->hw.wiphy->bands[chan->band];
 615         shift = ieee80211_vif_get_shift(&sdata->vif);
 616
 617         if (assoc_data->supp_rates_len) {
 618                 /*
 619                  * Get all rates supported by the device and the AP as
 620                  * some APs don't like getting a superset of their rates
 621                  * in the association request (e.g. D-Link DAP 1353 in
 622                  * b-only mode)...
 623                  */
 624                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 625                                                      assoc_data->supp_rates,
 626                                                      assoc_data->supp_rates_len,
 627                                                      &rates);
 628         } else {
 629                 /*
 630                  * In case AP not provide any supported rates information
 631                  * before association, we send information element(s) with
 632                  * all rates that we support.
 633                  */
 634                 rates_len = 0;
 635                 for (i = 0; i < sband->n_bitrates; i++) {
 636                         if ((rate_flags & sband->bitrates[i].flags)
 637                             != rate_flags)
 638                                 continue;
 639                         rates |= BIT(i);
 640                         rates_len++;
 641                 }
 642         }
 643
 644         skb = alloc_skb(local->hw.extra_tx_headroom +
 645                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 646                         2 + assoc_data->ssid_len + /* SSID */
 647                         4 + rates_len + /* (extended) rates */
 648                         4 + /* power capability */
 649                         2 + 2 * sband->n_channels + /* supported channels */
 650                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 651                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 652                         assoc_data->ie_len + /* extra IEs */
 653                         9, /* WMM */
 654                         GFP_KERNEL);
 655         if (!skb)
 656                 return;
 657
 658         skb_reserve(skb, local->hw.extra_tx_headroom);
 659
 660         capab = WLAN_CAPABILITY_ESS;
 661
 662         if (sband->band == IEEE80211_BAND_2GHZ) {
 663                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 664                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 665                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 666                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 667         }
 668
 669         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 670                 capab |= WLAN_CAPABILITY_PRIVACY;
 671
 672         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 673             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 674                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 675
 676         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 677                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 678
 679         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 680         memset(mgmt, 0, 24);
 681         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 682         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 683         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 684
 685         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 686                 skb_put(skb, 10);
 687                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 688                                                   IEEE80211_STYPE_REASSOC_REQ);
 689                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 690                 mgmt->u.reassoc_req.listen_interval =
 691                                 cpu_to_le16(local->hw.conf.listen_interval);
 692                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 693                        ETH_ALEN);
 694         } else {
 695                 skb_put(skb, 4);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_ASSOC_REQ);
 698                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.assoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701         }
 702
 703         /* SSID */
 704         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 705         *pos++ = WLAN_EID_SSID;
 706         *pos++ = assoc_data->ssid_len;
 707         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 708
 709         /* add all rates which were marked to be used above */
 710         supp_rates_len = rates_len;
 711         if (supp_rates_len > 8)
 712                 supp_rates_len = 8;
 713
 714         pos = skb_put(skb, supp_rates_len + 2);
 715         *pos++ = WLAN_EID_SUPP_RATES;
 716         *pos++ = supp_rates_len;
 717
 718         count = 0;
 719         for (i = 0; i < sband->n_bitrates; i++) {
 720                 if (BIT(i) & rates) {
 721                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 722                                                 5 * (1 << shift));
 723                         *pos++ = (u8) rate;
 724                         if (++count == 8)
 725                                 break;
 726                 }
 727         }
 728
 729         if (rates_len > count) {
 730                 pos = skb_put(skb, rates_len - count + 2);
 731                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 732                 *pos++ = rates_len - count;
 733
 734                 for (i++; i < sband->n_bitrates; i++) {
 735                         if (BIT(i) & rates) {
 736                                 int rate;
 737                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 738                                                     5 * (1 << shift));
 739                                 *pos++ = (u8) rate;
 740                         }
 741                 }
 742         }
 743
 744         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 745             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 746                 pos = skb_put(skb, 4);
 747                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 748                 *pos++ = 2;
 749                 *pos++ = 0; /* min tx power */
 750                  /* max tx power */
 751                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 752         }
 753
 754         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 755                 /* TODO: get this in reg domain format */
 756                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 757                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 758                 *pos++ = 2 * sband->n_channels;
 759                 for (i = 0; i < sband->n_channels; i++) {
 760                         *pos++ = ieee80211_frequency_to_channel(
 761                                         sband->channels[i].center_freq);
 762                         *pos++ = 1; /* one channel in the subband*/
 763                 }
 764         }
 765
 766         /* if present, add any custom IEs that go before HT */
 767         if (assoc_data->ie_len) {
 768                 static const u8 before_ht[] = {
 769                         WLAN_EID_SSID,
 770                         WLAN_EID_SUPP_RATES,
 771                         WLAN_EID_EXT_SUPP_RATES,
 772                         WLAN_EID_PWR_CAPABILITY,
 773                         WLAN_EID_SUPPORTED_CHANNELS,
 774                         WLAN_EID_RSN,
 775                         WLAN_EID_QOS_CAPA,
 776                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 777                         WLAN_EID_MOBILITY_DOMAIN,
 778                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 779                         WLAN_EID_RIC_DATA,              /* reassoc only */
 780                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 781                 };
 782                 static const u8 after_ric[] = {
 783                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 784                         WLAN_EID_HT_CAPABILITY,
 785                         WLAN_EID_BSS_COEX_2040,
 786                         WLAN_EID_EXT_CAPABILITY,
 787                         WLAN_EID_QOS_TRAFFIC_CAPA,
 788                         WLAN_EID_TIM_BCAST_REQ,
 789                         WLAN_EID_INTERWORKING,
 790                         /* 60GHz doesn't happen right now */
 791                         WLAN_EID_VHT_CAPABILITY,
 792                         WLAN_EID_OPMODE_NOTIF,
 793                 };
 794
 795                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 796                                                  assoc_data->ie_len,
 797                                                  before_ht,
 798                                                  ARRAY_SIZE(before_ht),
 799                                                  after_ric,
 800                                                  ARRAY_SIZE(after_ric),
 801                                                  offset);
 802                 pos = skb_put(skb, noffset - offset);
 803                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 804                 offset = noffset;
 805         }
 806
 807         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 808                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 809                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 810
 811         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 812                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 813                                     sband, chan, sdata->smps_mode);
 814
 815         /* if present, add any custom IEs that go before VHT */
 816         if (assoc_data->ie_len) {
 817                 static const u8 before_vht[] = {
 818                         WLAN_EID_SSID,
 819                         WLAN_EID_SUPP_RATES,
 820                         WLAN_EID_EXT_SUPP_RATES,
 821                         WLAN_EID_PWR_CAPABILITY,
 822                         WLAN_EID_SUPPORTED_CHANNELS,
 823                         WLAN_EID_RSN,
 824                         WLAN_EID_QOS_CAPA,
 825                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 826                         WLAN_EID_MOBILITY_DOMAIN,
 827                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 828                         WLAN_EID_HT_CAPABILITY,
 829                         WLAN_EID_BSS_COEX_2040,
 830                         WLAN_EID_EXT_CAPABILITY,
 831                         WLAN_EID_QOS_TRAFFIC_CAPA,
 832                         WLAN_EID_TIM_BCAST_REQ,
 833                         WLAN_EID_INTERWORKING,
 834                 };
 835
 836                 /* RIC already taken above, so no need to handle here anymore */
 837                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 838                                              before_vht, ARRAY_SIZE(before_vht),
 839                                              offset);
 840                 pos = skb_put(skb, noffset - offset);
 841                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 842                 offset = noffset;
 843         }
 844
 845         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 846                 ieee80211_add_vht_ie(sdata, skb, sband,
 847                                      &assoc_data->ap_vht_cap);
 848
 849         /* if present, add any custom non-vendor IEs that go after HT */
 850         if (assoc_data->ie_len) {
 851                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 852                                                     assoc_data->ie_len,
 853                                                     offset);
 854                 pos = skb_put(skb, noffset - offset);
 855                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 856                 offset = noffset;
 857         }
 858
 859         if (assoc_data->wmm) {
 860                 if (assoc_data->uapsd) {
 861                         qos_info = ifmgd->uapsd_queues;
 862                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 863                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 864                 } else {
 865                         qos_info = 0;
 866                 }
 867
 868                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 869         }
 870
 871         /* add any remaining custom (i.e. vendor specific here) IEs */
 872         if (assoc_data->ie_len) {
 873                 noffset = assoc_data->ie_len;
 874                 pos = skb_put(skb, noffset - offset);
 875                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 876         }
 877
 878         drv_mgd_prepare_tx(local, sdata);
 879
 880         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 881         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 882                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 883                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 884         ieee80211_tx_skb(sdata, skb);
 885 }
 886
 887 void ieee80211_send_pspoll(struct ieee80211_local *local,
 888                            struct ieee80211_sub_if_data *sdata)
 889 {
 890         struct ieee80211_pspoll *pspoll;
 891         struct sk_buff *skb;
 892
 893         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 894         if (!skb)
 895                 return;
 896
 897         pspoll = (struct ieee80211_pspoll *) skb->data;
 898         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 899
 900         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 901         ieee80211_tx_skb(sdata, skb);
 902 }
 903
 904 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 905                              struct ieee80211_sub_if_data *sdata,
 906                              int powersave)
 907 {
 908         struct sk_buff *skb;
 909         struct ieee80211_hdr_3addr *nullfunc;
 910         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 911
 912         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 913         if (!skb)
 914                 return;
 915
 916         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 917         if (powersave)
 918                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 919
 920         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 921                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 922
 923         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 924                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 925
 926         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 927                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 928
 929         ieee80211_tx_skb(sdata, skb);
 930 }
 931
 932 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 933                                           struct ieee80211_sub_if_data *sdata)
 934 {
 935         struct sk_buff *skb;
 936         struct ieee80211_hdr *nullfunc;
 937         __le16 fc;
 938
 939         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 940                 return;
 941
 942         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 943         if (!skb)
 944                 return;
 945
 946         skb_reserve(skb, local->hw.extra_tx_headroom);
 947
 948         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 949         memset(nullfunc, 0, 30);
 950         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 951                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 952         nullfunc->frame_control = fc;
 953         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 954         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 955         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 956         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 957
 958         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 959         ieee80211_tx_skb(sdata, skb);
 960 }
 961
 962 /* spectrum management related things */
 963 static void ieee80211_chswitch_work(struct work_struct *work)
 964 {
 965         struct ieee80211_sub_if_data *sdata =
 966                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 967         struct ieee80211_local *local = sdata->local;
 968         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 969         int ret;
 970
 971         if (!ieee80211_sdata_running(sdata))
 972                 return;
 973
 974         sdata_lock(sdata);
 975         mutex_lock(&local->mtx);
 976         mutex_lock(&local->chanctx_mtx);
 977
 978         if (!ifmgd->associated)
 979                 goto out;
 980
 981         if (!sdata->vif.csa_active)
 982                 goto out;
 983
 984         /*
 985          * using reservation isn't immediate as it may be deferred until later
 986          * with multi-vif. once reservation is complete it will re-schedule the
 987          * work with no reserved_chanctx so verify chandef to check if it
 988          * completed successfully
 989          */
 990
 991         if (sdata->reserved_chanctx) {
 992                 /*
 993                  * with multi-vif csa driver may call ieee80211_csa_finish()
 994                  * many times while waiting for other interfaces to use their
 995                  * reservations
 996                  */
 997                 if (sdata->reserved_ready)
 998                         goto out;
 999
1000                 ret = ieee80211_vif_use_reserved_context(sdata);
1001                 if (ret) {
1002                         sdata_info(sdata,
1003                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1004                                    ret);
1005                         ieee80211_queue_work(&sdata->local->hw,
1006                                              &ifmgd->csa_connection_drop_work);
1007                         goto out;
1008                 }
1009
1010                 goto out;
1011         }
1012
1013         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1014                                         &sdata->csa_chandef)) {
1015                 sdata_info(sdata,
1016                            "failed to finalize channel switch, disconnecting\n");
1017                 ieee80211_queue_work(&sdata->local->hw,
1018                                      &ifmgd->csa_connection_drop_work);
1019                 goto out;
1020         }
1021
1022         /* XXX: shouldn't really modify cfg80211-owned data! */
1023         ifmgd->associated->channel = sdata->csa_chandef.chan;
1024
1025         ifmgd->csa_waiting_bcn = true;
1026
1027         ieee80211_sta_reset_beacon_monitor(sdata);
1028         ieee80211_sta_reset_conn_monitor(sdata);
1029
1030 out:
1031         mutex_unlock(&local->chanctx_mtx);
1032         mutex_unlock(&local->mtx);
1033         sdata_unlock(sdata);
1034 }
1035
1036 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1037 {
1038         struct ieee80211_local *local = sdata->local;
1039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040         int ret;
1041
1042         sdata_assert_lock(sdata);
1043
1044         WARN_ON(!sdata->vif.csa_active);
1045
1046         if (sdata->csa_block_tx) {
1047                 ieee80211_wake_vif_queues(local, sdata,
1048                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1049                 sdata->csa_block_tx = false;
1050         }
1051
1052         sdata->vif.csa_active = false;
1053         ifmgd->csa_waiting_bcn = false;
1054
1055         ret = drv_post_channel_switch(sdata);
1056         if (ret) {
1057                 sdata_info(sdata,
1058                            "driver post channel switch failed, disconnecting\n");
1059                 ieee80211_queue_work(&local->hw,
1060                                      &ifmgd->csa_connection_drop_work);
1061                 return;
1062         }
1063 }
1064
1065 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1066 {
1067         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1068         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1069
1070         trace_api_chswitch_done(sdata, success);
1071         if (!success) {
1072                 sdata_info(sdata,
1073                            "driver channel switch failed, disconnecting\n");
1074                 ieee80211_queue_work(&sdata->local->hw,
1075                                      &ifmgd->csa_connection_drop_work);
1076         } else {
1077                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1078         }
1079 }
1080 EXPORT_SYMBOL(ieee80211_chswitch_done);
1081
1082 static void ieee80211_chswitch_timer(unsigned long data)
1083 {
1084         struct ieee80211_sub_if_data *sdata =
1085                 (struct ieee80211_sub_if_data *) data;
1086
1087         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1088 }
1089
1090 static void
1091 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1092                                  u64 timestamp, u32 device_timestamp,
1093                                  struct ieee802_11_elems *elems,
1094                                  bool beacon)
1095 {
1096         struct ieee80211_local *local = sdata->local;
1097         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1098         struct cfg80211_bss *cbss = ifmgd->associated;
1099         struct ieee80211_chanctx_conf *conf;
1100         struct ieee80211_chanctx *chanctx;
1101         enum ieee80211_band current_band;
1102         struct ieee80211_csa_ie csa_ie;
1103         struct ieee80211_channel_switch ch_switch;
1104         int res;
1105
1106         sdata_assert_lock(sdata);
1107
1108         if (!cbss)
1109                 return;
1110
1111         if (local->scanning)
1112                 return;
1113
1114         /* disregard subsequent announcements if we are already processing */
1115         if (sdata->vif.csa_active)
1116                 return;
1117
1118         current_band = cbss->channel->band;
1119         memset(&csa_ie, 0, sizeof(csa_ie));
1120         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1121                                            ifmgd->flags,
1122                                            ifmgd->associated->bssid, &csa_ie);
1123         if (res < 0)
1124                 ieee80211_queue_work(&local->hw,
1125                                      &ifmgd->csa_connection_drop_work);
1126         if (res)
1127                 return;
1128
1129         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1130                                      IEEE80211_CHAN_DISABLED)) {
1131                 sdata_info(sdata,
1132                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1133                            ifmgd->associated->bssid,
1134                            csa_ie.chandef.chan->center_freq,
1135                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1136                            csa_ie.chandef.center_freq2);
1137                 ieee80211_queue_work(&local->hw,
1138                                      &ifmgd->csa_connection_drop_work);
1139                 return;
1140         }
1141
1142         mutex_lock(&local->mtx);
1143         mutex_lock(&local->chanctx_mtx);
1144         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1145                                          lockdep_is_held(&local->chanctx_mtx));
1146         if (!conf) {
1147                 sdata_info(sdata,
1148                            "no channel context assigned to vif?, disconnecting\n");
1149                 ieee80211_queue_work(&local->hw,
1150                                      &ifmgd->csa_connection_drop_work);
1151                 mutex_unlock(&local->chanctx_mtx);
1152                 mutex_unlock(&local->mtx);
1153                 return;
1154         }
1155
1156         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1157
1158         if (local->use_chanctx &&
1159             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1160                 sdata_info(sdata,
1161                            "driver doesn't support chan-switch with channel contexts\n");
1162                 ieee80211_queue_work(&local->hw,
1163                                      &ifmgd->csa_connection_drop_work);
1164                 mutex_unlock(&local->chanctx_mtx);
1165                 mutex_unlock(&local->mtx);
1166                 return;
1167         }
1168
1169         ch_switch.timestamp = timestamp;
1170         ch_switch.device_timestamp = device_timestamp;
1171         ch_switch.block_tx = csa_ie.mode;
1172         ch_switch.chandef = csa_ie.chandef;
1173         ch_switch.count = csa_ie.count;
1174
1175         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1176                 sdata_info(sdata,
1177                            "preparing for channel switch failed, disconnecting\n");
1178                 ieee80211_queue_work(&local->hw,
1179                                      &ifmgd->csa_connection_drop_work);
1180                 mutex_unlock(&local->chanctx_mtx);
1181                 mutex_unlock(&local->mtx);
1182                 return;
1183         }
1184
1185         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1186                                             chanctx->mode, false);
1187         if (res) {
1188                 sdata_info(sdata,
1189                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1190                            res);
1191                 ieee80211_queue_work(&local->hw,
1192                                      &ifmgd->csa_connection_drop_work);
1193                 mutex_unlock(&local->chanctx_mtx);
1194                 mutex_unlock(&local->mtx);
1195                 return;
1196         }
1197         mutex_unlock(&local->chanctx_mtx);
1198
1199         sdata->vif.csa_active = true;
1200         sdata->csa_chandef = csa_ie.chandef;
1201         sdata->csa_block_tx = csa_ie.mode;
1202
1203         if (sdata->csa_block_tx)
1204                 ieee80211_stop_vif_queues(local, sdata,
1205                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1206         mutex_unlock(&local->mtx);
1207
1208         if (local->ops->channel_switch) {
1209                 /* use driver's channel switch callback */
1210                 drv_channel_switch(local, sdata, &ch_switch);
1211                 return;
1212         }
1213
1214         /* channel switch handled in software */
1215         if (csa_ie.count <= 1)
1216                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1217         else
1218                 mod_timer(&ifmgd->chswitch_timer,
1219                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1220                                          cbss->beacon_interval));
1221 }
1222
1223 static bool
1224 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1225                                  struct ieee80211_channel *channel,
1226                                  const u8 *country_ie, u8 country_ie_len,
1227                                  const u8 *pwr_constr_elem,
1228                                  int *chan_pwr, int *pwr_reduction)
1229 {
1230         struct ieee80211_country_ie_triplet *triplet;
1231         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1232         int i, chan_increment;
1233         bool have_chan_pwr = false;
1234
1235         /* Invalid IE */
1236         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1237                 return false;
1238
1239         triplet = (void *)(country_ie + 3);
1240         country_ie_len -= 3;
1241
1242         switch (channel->band) {
1243         default:
1244                 WARN_ON_ONCE(1);
1245                 /* fall through */
1246         case IEEE80211_BAND_2GHZ:
1247         case IEEE80211_BAND_60GHZ:
1248                 chan_increment = 1;
1249                 break;
1250         case IEEE80211_BAND_5GHZ:
1251                 chan_increment = 4;
1252                 break;
1253         }
1254
1255         /* find channel */
1256         while (country_ie_len >= 3) {
1257                 u8 first_channel = triplet->chans.first_channel;
1258
1259                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1260                         goto next;
1261
1262                 for (i = 0; i < triplet->chans.num_channels; i++) {
1263                         if (first_channel + i * chan_increment == chan) {
1264                                 have_chan_pwr = true;
1265                                 *chan_pwr = triplet->chans.max_power;
1266                                 break;
1267                         }
1268                 }
1269                 if (have_chan_pwr)
1270                         break;
1271
1272  next:
1273                 triplet++;
1274                 country_ie_len -= 3;
1275         }
1276
1277         if (have_chan_pwr)
1278                 *pwr_reduction = *pwr_constr_elem;
1279         return have_chan_pwr;
1280 }
1281
1282 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1283                                       struct ieee80211_channel *channel,
1284                                       const u8 *cisco_dtpc_ie,
1285                                       int *pwr_level)
1286 {
1287         /* From practical testing, the first data byte of the DTPC element
1288          * seems to contain the requested dBm level, and the CLI on Cisco
1289          * APs clearly state the range is -127 to 127 dBm, which indicates
1290          * a signed byte, although it seemingly never actually goes negative.
1291          * The other byte seems to always be zero.
1292          */
1293         *pwr_level = (__s8)cisco_dtpc_ie[4];
1294 }
1295
1296 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1297                                        struct ieee80211_channel *channel,
1298                                        struct ieee80211_mgmt *mgmt,
1299                                        const u8 *country_ie, u8 country_ie_len,
1300                                        const u8 *pwr_constr_ie,
1301                                        const u8 *cisco_dtpc_ie)
1302 {
1303         bool has_80211h_pwr = false, has_cisco_pwr = false;
1304         int chan_pwr = 0, pwr_reduction_80211h = 0;
1305         int pwr_level_cisco, pwr_level_80211h;
1306         int new_ap_level;
1307
1308         if (country_ie && pwr_constr_ie &&
1309             mgmt->u.probe_resp.capab_info &
1310                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
1311                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1312                         sdata, channel, country_ie, country_ie_len,
1313                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1314                 pwr_level_80211h =
1315                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1316         }
1317
1318         if (cisco_dtpc_ie) {
1319                 ieee80211_find_cisco_dtpc(
1320                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1321                 has_cisco_pwr = true;
1322         }
1323
1324         if (!has_80211h_pwr && !has_cisco_pwr)
1325                 return 0;
1326
1327         /* If we have both 802.11h and Cisco DTPC, apply both limits
1328          * by picking the smallest of the two power levels advertised.
1329          */
1330         if (has_80211h_pwr &&
1331             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1332                 sdata_info(sdata,
1333                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1334                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1335                            sdata->u.mgd.bssid);
1336                 new_ap_level = pwr_level_80211h;
1337         } else {  /* has_cisco_pwr is always true here. */
1338                 sdata_info(sdata,
1339                            "Limiting TX power to %d dBm as advertised by %pM\n",
1340                            pwr_level_cisco, sdata->u.mgd.bssid);
1341                 new_ap_level = pwr_level_cisco;
1342         }
1343
1344         if (sdata->ap_power_level == new_ap_level)
1345                 return 0;
1346
1347         sdata->ap_power_level = new_ap_level;
1348         if (__ieee80211_recalc_txpower(sdata))
1349                 return BSS_CHANGED_TXPOWER;
1350         return 0;
1351 }
1352
1353 /* powersave */
1354 static void ieee80211_enable_ps(struct ieee80211_local *local,
1355                                 struct ieee80211_sub_if_data *sdata)
1356 {
1357         struct ieee80211_conf *conf = &local->hw.conf;
1358
1359         /*
1360          * If we are scanning right now then the parameters will
1361          * take effect when scan finishes.
1362          */
1363         if (local->scanning)
1364                 return;
1365
1366         if (conf->dynamic_ps_timeout > 0 &&
1367             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1368                 mod_timer(&local->dynamic_ps_timer, jiffies +
1369                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1370         } else {
1371                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1372                         ieee80211_send_nullfunc(local, sdata, 1);
1373
1374                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1375                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1376                         return;
1377
1378                 conf->flags |= IEEE80211_CONF_PS;
1379                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1380         }
1381 }
1382
1383 static void ieee80211_change_ps(struct ieee80211_local *local)
1384 {
1385         struct ieee80211_conf *conf = &local->hw.conf;
1386
1387         if (local->ps_sdata) {
1388                 ieee80211_enable_ps(local, local->ps_sdata);
1389         } else if (conf->flags & IEEE80211_CONF_PS) {
1390                 conf->flags &= ~IEEE80211_CONF_PS;
1391                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1392                 del_timer_sync(&local->dynamic_ps_timer);
1393                 cancel_work_sync(&local->dynamic_ps_enable_work);
1394         }
1395 }
1396
1397 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1398 {
1399         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1400         struct sta_info *sta = NULL;
1401         bool authorized = false;
1402
1403         if (!mgd->powersave)
1404                 return false;
1405
1406         if (mgd->broken_ap)
1407                 return false;
1408
1409         if (!mgd->associated)
1410                 return false;
1411
1412         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1413                 return false;
1414
1415         if (!mgd->have_beacon)
1416                 return false;
1417
1418         rcu_read_lock();
1419         sta = sta_info_get(sdata, mgd->bssid);
1420         if (sta)
1421                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1422         rcu_read_unlock();
1423
1424         return authorized;
1425 }
1426
1427 /* need to hold RTNL or interface lock */
1428 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1429 {
1430         struct ieee80211_sub_if_data *sdata, *found = NULL;
1431         int count = 0;
1432         int timeout;
1433
1434         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1435                 local->ps_sdata = NULL;
1436                 return;
1437         }
1438
1439         list_for_each_entry(sdata, &local->interfaces, list) {
1440                 if (!ieee80211_sdata_running(sdata))
1441                         continue;
1442                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1443                         /* If an AP vif is found, then disable PS
1444                          * by setting the count to zero thereby setting
1445                          * ps_sdata to NULL.
1446                          */
1447                         count = 0;
1448                         break;
1449                 }
1450                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1451                         continue;
1452                 found = sdata;
1453                 count++;
1454         }
1455
1456         if (count == 1 && ieee80211_powersave_allowed(found)) {
1457                 s32 beaconint_us;
1458
1459                 if (latency < 0)
1460                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1461
1462                 beaconint_us = ieee80211_tu_to_usec(
1463                                         found->vif.bss_conf.beacon_int);
1464
1465                 timeout = local->dynamic_ps_forced_timeout;
1466                 if (timeout < 0) {
1467                         /*
1468                          * Go to full PSM if the user configures a very low
1469                          * latency requirement.
1470                          * The 2000 second value is there for compatibility
1471                          * until the PM_QOS_NETWORK_LATENCY is configured
1472                          * with real values.
1473                          */
1474                         if (latency > (1900 * USEC_PER_MSEC) &&
1475                             latency != (2000 * USEC_PER_SEC))
1476                                 timeout = 0;
1477                         else
1478                                 timeout = 100;
1479                 }
1480                 local->hw.conf.dynamic_ps_timeout = timeout;
1481
1482                 if (beaconint_us > latency) {
1483                         local->ps_sdata = NULL;
1484                 } else {
1485                         int maxslp = 1;
1486                         u8 dtimper = found->u.mgd.dtim_period;
1487
1488                         /* If the TIM IE is invalid, pretend the value is 1 */
1489                         if (!dtimper)
1490                                 dtimper = 1;
1491                         else if (dtimper > 1)
1492                                 maxslp = min_t(int, dtimper,
1493                                                     latency / beaconint_us);
1494
1495                         local->hw.conf.max_sleep_period = maxslp;
1496                         local->hw.conf.ps_dtim_period = dtimper;
1497                         local->ps_sdata = found;
1498                 }
1499         } else {
1500                 local->ps_sdata = NULL;
1501         }
1502
1503         ieee80211_change_ps(local);
1504 }
1505
1506 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1507 {
1508         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1509
1510         if (sdata->vif.bss_conf.ps != ps_allowed) {
1511                 sdata->vif.bss_conf.ps = ps_allowed;
1512                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1513         }
1514 }
1515
1516 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1517 {
1518         struct ieee80211_local *local =
1519                 container_of(work, struct ieee80211_local,
1520                              dynamic_ps_disable_work);
1521
1522         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1523                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1524                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1525         }
1526
1527         ieee80211_wake_queues_by_reason(&local->hw,
1528                                         IEEE80211_MAX_QUEUE_MAP,
1529                                         IEEE80211_QUEUE_STOP_REASON_PS,
1530                                         false);
1531 }
1532
1533 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1534 {
1535         struct ieee80211_local *local =
1536                 container_of(work, struct ieee80211_local,
1537                              dynamic_ps_enable_work);
1538         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1539         struct ieee80211_if_managed *ifmgd;
1540         unsigned long flags;
1541         int q;
1542
1543         /* can only happen when PS was just disabled anyway */
1544         if (!sdata)
1545                 return;
1546
1547         ifmgd = &sdata->u.mgd;
1548
1549         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1550                 return;
1551
1552         if (local->hw.conf.dynamic_ps_timeout > 0) {
1553                 /* don't enter PS if TX frames are pending */
1554                 if (drv_tx_frames_pending(local)) {
1555                         mod_timer(&local->dynamic_ps_timer, jiffies +
1556                                   msecs_to_jiffies(
1557                                   local->hw.conf.dynamic_ps_timeout));
1558                         return;
1559                 }
1560
1561                 /*
1562                  * transmission can be stopped by others which leads to
1563                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1564                  * is not the actual idle state.
1565                  */
1566                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1567                 for (q = 0; q < local->hw.queues; q++) {
1568                         if (local->queue_stop_reasons[q]) {
1569                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1570                                                        flags);
1571                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1572                                           msecs_to_jiffies(
1573                                           local->hw.conf.dynamic_ps_timeout));
1574                                 return;
1575                         }
1576                 }
1577                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1578         }
1579
1580         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1581             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1582                 if (drv_tx_frames_pending(local)) {
1583                         mod_timer(&local->dynamic_ps_timer, jiffies +
1584                                   msecs_to_jiffies(
1585                                   local->hw.conf.dynamic_ps_timeout));
1586                 } else {
1587                         ieee80211_send_nullfunc(local, sdata, 1);
1588                         /* Flush to get the tx status of nullfunc frame */
1589                         ieee80211_flush_queues(local, sdata);
1590                 }
1591         }
1592
1593         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1594               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1595             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1596                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1597                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1598                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1599         }
1600 }
1601
1602 void ieee80211_dynamic_ps_timer(unsigned long data)
1603 {
1604         struct ieee80211_local *local = (void *) data;
1605
1606         if (local->quiescing || local->suspended)
1607                 return;
1608
1609         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1610 }
1611
1612 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1613 {
1614         struct delayed_work *delayed_work =
1615                 container_of(work, struct delayed_work, work);
1616         struct ieee80211_sub_if_data *sdata =
1617                 container_of(delayed_work, struct ieee80211_sub_if_data,
1618                              dfs_cac_timer_work);
1619         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1620
1621         mutex_lock(&sdata->local->mtx);
1622         if (sdata->wdev.cac_started) {
1623                 ieee80211_vif_release_channel(sdata);
1624                 cfg80211_cac_event(sdata->dev, &chandef,
1625                                    NL80211_RADAR_CAC_FINISHED,
1626                                    GFP_KERNEL);
1627         }
1628         mutex_unlock(&sdata->local->mtx);
1629 }
1630
1631 static bool
1632 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1633 {
1634         struct ieee80211_local *local = sdata->local;
1635         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1636         bool ret;
1637         int ac;
1638
1639         if (local->hw.queues < IEEE80211_NUM_ACS)
1640                 return false;
1641
1642         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1643                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1644                 int non_acm_ac;
1645                 unsigned long now = jiffies;
1646
1647                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1648                     tx_tspec->admitted_time &&
1649                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1650                         tx_tspec->consumed_tx_time = 0;
1651                         tx_tspec->time_slice_start = now;
1652
1653                         if (tx_tspec->downgraded)
1654                                 tx_tspec->action =
1655                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1656                 }
1657
1658                 switch (tx_tspec->action) {
1659                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1660                         /* take the original parameters */
1661                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1662                                 sdata_err(sdata,
1663                                           "failed to set TX queue parameters for queue %d\n",
1664                                           ac);
1665                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1666                         tx_tspec->downgraded = false;
1667                         ret = true;
1668                         break;
1669                 case TX_TSPEC_ACTION_DOWNGRADE:
1670                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1671                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1672                                 ret = true;
1673                                 break;
1674                         }
1675                         /* downgrade next lower non-ACM AC */
1676                         for (non_acm_ac = ac + 1;
1677                              non_acm_ac < IEEE80211_NUM_ACS;
1678                              non_acm_ac++)
1679                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1680                                         break;
1681                         /* The loop will result in using BK even if it requires
1682                          * admission control, such configuration makes no sense
1683                          * and we have to transmit somehow - the AC selection
1684                          * does the same thing.
1685                          */
1686                         if (drv_conf_tx(local, sdata, ac,
1687                                         &sdata->tx_conf[non_acm_ac]))
1688                                 sdata_err(sdata,
1689                                           "failed to set TX queue parameters for queue %d\n",
1690                                           ac);
1691                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1692                         ret = true;
1693                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1694                                 tx_tspec->time_slice_start + HZ - now + 1);
1695                         break;
1696                 case TX_TSPEC_ACTION_NONE:
1697                         /* nothing now */
1698                         break;
1699                 }
1700         }
1701
1702         return ret;
1703 }
1704
1705 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1706 {
1707         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1708                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1709 }
1710
1711 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1712 {
1713         struct ieee80211_sub_if_data *sdata;
1714
1715         sdata = container_of(work, struct ieee80211_sub_if_data,
1716                              u.mgd.tx_tspec_wk.work);
1717         ieee80211_sta_handle_tspec_ac_params(sdata);
1718 }
1719
1720 /* MLME */
1721 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1722                                      struct ieee80211_sub_if_data *sdata,
1723                                      const u8 *wmm_param, size_t wmm_param_len)
1724 {
1725         struct ieee80211_tx_queue_params params;
1726         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1727         size_t left;
1728         int count;
1729         const u8 *pos;
1730         u8 uapsd_queues = 0;
1731
1732         if (!local->ops->conf_tx)
1733                 return false;
1734
1735         if (local->hw.queues < IEEE80211_NUM_ACS)
1736                 return false;
1737
1738         if (!wmm_param)
1739                 return false;
1740
1741         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1742                 return false;
1743
1744         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1745                 uapsd_queues = ifmgd->uapsd_queues;
1746
1747         count = wmm_param[6] & 0x0f;
1748         if (count == ifmgd->wmm_last_param_set)
1749                 return false;
1750         ifmgd->wmm_last_param_set = count;
1751
1752         pos = wmm_param + 8;
1753         left = wmm_param_len - 8;
1754
1755         memset(&params, 0, sizeof(params));
1756
1757         sdata->wmm_acm = 0;
1758         for (; left >= 4; left -= 4, pos += 4) {
1759                 int aci = (pos[0] >> 5) & 0x03;
1760                 int acm = (pos[0] >> 4) & 0x01;
1761                 bool uapsd = false;
1762                 int queue;
1763
1764                 switch (aci) {
1765                 case 1: /* AC_BK */
1766                         queue = 3;
1767                         if (acm)
1768                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1769                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1770                                 uapsd = true;
1771                         break;
1772                 case 2: /* AC_VI */
1773                         queue = 1;
1774                         if (acm)
1775                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1776                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1777                                 uapsd = true;
1778                         break;
1779                 case 3: /* AC_VO */
1780                         queue = 0;
1781                         if (acm)
1782                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1783                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1784                                 uapsd = true;
1785                         break;
1786                 case 0: /* AC_BE */
1787                 default:
1788                         queue = 2;
1789                         if (acm)
1790                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1791                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1792                                 uapsd = true;
1793                         break;
1794                 }
1795
1796                 params.aifs = pos[0] & 0x0f;
1797                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1798                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1799                 params.txop = get_unaligned_le16(pos + 2);
1800                 params.acm = acm;
1801                 params.uapsd = uapsd;
1802
1803                 mlme_dbg(sdata,
1804                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1805                          queue, aci, acm,
1806                          params.aifs, params.cw_min, params.cw_max,
1807                          params.txop, params.uapsd,
1808                          ifmgd->tx_tspec[queue].downgraded);
1809                 sdata->tx_conf[queue] = params;
1810                 if (!ifmgd->tx_tspec[queue].downgraded &&
1811                     drv_conf_tx(local, sdata, queue, &params))
1812                         sdata_err(sdata,
1813                                   "failed to set TX queue parameters for queue %d\n",
1814                                   queue);
1815         }
1816
1817         /* enable WMM or activate new settings */
1818         sdata->vif.bss_conf.qos = true;
1819         return true;
1820 }
1821
1822 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1823 {
1824         lockdep_assert_held(&sdata->local->mtx);
1825
1826         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1827         ieee80211_run_deferred_scan(sdata->local);
1828 }
1829
1830 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1831 {
1832         mutex_lock(&sdata->local->mtx);
1833         __ieee80211_stop_poll(sdata);
1834         mutex_unlock(&sdata->local->mtx);
1835 }
1836
1837 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1838                                            u16 capab, bool erp_valid, u8 erp)
1839 {
1840         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1841         u32 changed = 0;
1842         bool use_protection;
1843         bool use_short_preamble;
1844         bool use_short_slot;
1845
1846         if (erp_valid) {
1847                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1848                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1849         } else {
1850                 use_protection = false;
1851                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1852         }
1853
1854         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1855         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1856                 use_short_slot = true;
1857
1858         if (use_protection != bss_conf->use_cts_prot) {
1859                 bss_conf->use_cts_prot = use_protection;
1860                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1861         }
1862
1863         if (use_short_preamble != bss_conf->use_short_preamble) {
1864                 bss_conf->use_short_preamble = use_short_preamble;
1865                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1866         }
1867
1868         if (use_short_slot != bss_conf->use_short_slot) {
1869                 bss_conf->use_short_slot = use_short_slot;
1870                 changed |= BSS_CHANGED_ERP_SLOT;
1871         }
1872
1873         return changed;
1874 }
1875
1876 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1877                                      struct cfg80211_bss *cbss,
1878                                      u32 bss_info_changed)
1879 {
1880         struct ieee80211_bss *bss = (void *)cbss->priv;
1881         struct ieee80211_local *local = sdata->local;
1882         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1883
1884         bss_info_changed |= BSS_CHANGED_ASSOC;
1885         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1886                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1887
1888         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1889                 beacon_loss_count * bss_conf->beacon_int));
1890
1891         sdata->u.mgd.associated = cbss;
1892         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1893
1894         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1895
1896         if (sdata->vif.p2p) {
1897                 const struct cfg80211_bss_ies *ies;
1898
1899                 rcu_read_lock();
1900                 ies = rcu_dereference(cbss->ies);
1901                 if (ies) {
1902                         int ret;
1903
1904                         ret = cfg80211_get_p2p_attr(
1905                                         ies->data, ies->len,
1906                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1907                                         (u8 *) &bss_conf->p2p_noa_attr,
1908                                         sizeof(bss_conf->p2p_noa_attr));
1909                         if (ret >= 2) {
1910                                 sdata->u.mgd.p2p_noa_index =
1911                                         bss_conf->p2p_noa_attr.index;
1912                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1913                         }
1914                 }
1915                 rcu_read_unlock();
1916         }
1917
1918         /* just to be sure */
1919         ieee80211_stop_poll(sdata);
1920
1921         ieee80211_led_assoc(local, 1);
1922
1923         if (sdata->u.mgd.have_beacon) {
1924                 /*
1925                  * If the AP is buggy we may get here with no DTIM period
1926                  * known, so assume it's 1 which is the only safe assumption
1927                  * in that case, although if the TIM IE is broken powersave
1928                  * probably just won't work at all.
1929                  */
1930                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1931                 bss_conf->beacon_rate = bss->beacon_rate;
1932                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1933         } else {
1934                 bss_conf->beacon_rate = NULL;
1935                 bss_conf->dtim_period = 0;
1936         }
1937
1938         bss_conf->assoc = 1;
1939
1940         /* Tell the driver to monitor connection quality (if supported) */
1941         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1942             bss_conf->cqm_rssi_thold)
1943                 bss_info_changed |= BSS_CHANGED_CQM;
1944
1945         /* Enable ARP filtering */
1946         if (bss_conf->arp_addr_cnt)
1947                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1948
1949         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1950
1951         mutex_lock(&local->iflist_mtx);
1952         ieee80211_recalc_ps(local, -1);
1953         mutex_unlock(&local->iflist_mtx);
1954
1955         ieee80211_recalc_smps(sdata);
1956         ieee80211_recalc_ps_vif(sdata);
1957
1958         netif_carrier_on(sdata->dev);
1959 }
1960
1961 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1962                                    u16 stype, u16 reason, bool tx,
1963                                    u8 *frame_buf)
1964 {
1965         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1966         struct ieee80211_local *local = sdata->local;
1967         u32 changed = 0;
1968
1969         sdata_assert_lock(sdata);
1970
1971         if (WARN_ON_ONCE(tx && !frame_buf))
1972                 return;
1973
1974         if (WARN_ON(!ifmgd->associated))
1975                 return;
1976
1977         ieee80211_stop_poll(sdata);
1978
1979         ifmgd->associated = NULL;
1980         netif_carrier_off(sdata->dev);
1981
1982         /*
1983          * if we want to get out of ps before disassoc (why?) we have
1984          * to do it before sending disassoc, as otherwise the null-packet
1985          * won't be valid.
1986          */
1987         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1988                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1989                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1990         }
1991         local->ps_sdata = NULL;
1992
1993         /* disable per-vif ps */
1994         ieee80211_recalc_ps_vif(sdata);
1995
1996         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1997         if (tx)
1998                 ieee80211_flush_queues(local, sdata);
1999
2000         /* deauthenticate/disassociate now */
2001         if (tx || frame_buf)
2002                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2003                                                reason, tx, frame_buf);
2004
2005         /* flush out frame */
2006         if (tx)
2007                 ieee80211_flush_queues(local, sdata);
2008
2009         /* clear bssid only after building the needed mgmt frames */
2010         memset(ifmgd->bssid, 0, ETH_ALEN);
2011
2012         /* remove AP and TDLS peers */
2013         sta_info_flush(sdata);
2014
2015         /* finally reset all BSS / config parameters */
2016         changed |= ieee80211_reset_erp_info(sdata);
2017
2018         ieee80211_led_assoc(local, 0);
2019         changed |= BSS_CHANGED_ASSOC;
2020         sdata->vif.bss_conf.assoc = false;
2021
2022         ifmgd->p2p_noa_index = -1;
2023         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2024                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2025
2026         /* on the next assoc, re-program HT/VHT parameters */
2027         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2028         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2029         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2030         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2031
2032         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2033
2034         del_timer_sync(&local->dynamic_ps_timer);
2035         cancel_work_sync(&local->dynamic_ps_enable_work);
2036
2037         /* Disable ARP filtering */
2038         if (sdata->vif.bss_conf.arp_addr_cnt)
2039                 changed |= BSS_CHANGED_ARP_FILTER;
2040
2041         sdata->vif.bss_conf.qos = false;
2042         changed |= BSS_CHANGED_QOS;
2043
2044         /* The BSSID (not really interesting) and HT changed */
2045         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2046         ieee80211_bss_info_change_notify(sdata, changed);
2047
2048         /* disassociated - set to defaults now */
2049         ieee80211_set_wmm_default(sdata, false);
2050
2051         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2052         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2053         del_timer_sync(&sdata->u.mgd.timer);
2054         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2055
2056         sdata->vif.bss_conf.dtim_period = 0;
2057         sdata->vif.bss_conf.beacon_rate = NULL;
2058
2059         ifmgd->have_beacon = false;
2060
2061         ifmgd->flags = 0;
2062         mutex_lock(&local->mtx);
2063         ieee80211_vif_release_channel(sdata);
2064
2065         sdata->vif.csa_active = false;
2066         ifmgd->csa_waiting_bcn = false;
2067         if (sdata->csa_block_tx) {
2068                 ieee80211_wake_vif_queues(local, sdata,
2069                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2070                 sdata->csa_block_tx = false;
2071         }
2072         mutex_unlock(&local->mtx);
2073
2074         /* existing TX TSPEC sessions no longer exist */
2075         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2076         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2077
2078         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2079 }
2080
2081 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2082                              struct ieee80211_hdr *hdr)
2083 {
2084         /*
2085          * We can postpone the mgd.timer whenever receiving unicast frames
2086          * from AP because we know that the connection is working both ways
2087          * at that time. But multicast frames (and hence also beacons) must
2088          * be ignored here, because we need to trigger the timer during
2089          * data idle periods for sending the periodic probe request to the
2090          * AP we're connected to.
2091          */
2092         if (is_multicast_ether_addr(hdr->addr1))
2093                 return;
2094
2095         ieee80211_sta_reset_conn_monitor(sdata);
2096 }
2097
2098 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2099 {
2100         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2101         struct ieee80211_local *local = sdata->local;
2102
2103         mutex_lock(&local->mtx);
2104         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2105                 goto out;
2106
2107         __ieee80211_stop_poll(sdata);
2108
2109         mutex_lock(&local->iflist_mtx);
2110         ieee80211_recalc_ps(local, -1);
2111         mutex_unlock(&local->iflist_mtx);
2112
2113         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2114                 goto out;
2115
2116         /*
2117          * We've received a probe response, but are not sure whether
2118          * we have or will be receiving any beacons or data, so let's
2119          * schedule the timers again, just in case.
2120          */
2121         ieee80211_sta_reset_beacon_monitor(sdata);
2122
2123         mod_timer(&ifmgd->conn_mon_timer,
2124                   round_jiffies_up(jiffies +
2125                                    IEEE80211_CONNECTION_IDLE_TIME));
2126 out:
2127         mutex_unlock(&local->mtx);
2128 }
2129
2130 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2131                                            struct ieee80211_hdr *hdr,
2132                                            u16 tx_time)
2133 {
2134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2135         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2136         int ac = ieee80211_ac_from_tid(tid);
2137         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2138         unsigned long now = jiffies;
2139
2140         if (likely(!tx_tspec->admitted_time))
2141                 return;
2142
2143         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2144                 tx_tspec->consumed_tx_time = 0;
2145                 tx_tspec->time_slice_start = now;
2146
2147                 if (tx_tspec->downgraded) {
2148                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2149                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2150                 }
2151         }
2152
2153         if (tx_tspec->downgraded)
2154                 return;
2155
2156         tx_tspec->consumed_tx_time += tx_time;
2157
2158         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2159                 tx_tspec->downgraded = true;
2160                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2161                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2162         }
2163 }
2164
2165 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2166                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2167 {
2168         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2169
2170         if (!ieee80211_is_data(hdr->frame_control))
2171             return;
2172
2173         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2174             sdata->u.mgd.probe_send_count > 0) {
2175                 if (ack)
2176                         ieee80211_sta_reset_conn_monitor(sdata);
2177                 else
2178                         sdata->u.mgd.nullfunc_failed = true;
2179                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2180                 return;
2181         }
2182
2183         if (ack)
2184                 ieee80211_sta_reset_conn_monitor(sdata);
2185 }
2186
2187 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2188 {
2189         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2190         const u8 *ssid;
2191         u8 *dst = ifmgd->associated->bssid;
2192         u8 unicast_limit = max(1, max_probe_tries - 3);
2193
2194         /*
2195          * Try sending broadcast probe requests for the last three
2196          * probe requests after the first ones failed since some
2197          * buggy APs only support broadcast probe requests.
2198          */
2199         if (ifmgd->probe_send_count >= unicast_limit)
2200                 dst = NULL;
2201
2202         /*
2203          * When the hardware reports an accurate Tx ACK status, it's
2204          * better to send a nullfunc frame instead of a probe request,
2205          * as it will kick us off the AP quickly if we aren't associated
2206          * anymore. The timeout will be reset if the frame is ACKed by
2207          * the AP.
2208          */
2209         ifmgd->probe_send_count++;
2210
2211         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2212                 ifmgd->nullfunc_failed = false;
2213                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2214         } else {
2215                 int ssid_len;
2216
2217                 rcu_read_lock();
2218                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2219                 if (WARN_ON_ONCE(ssid == NULL))
2220                         ssid_len = 0;
2221                 else
2222                         ssid_len = ssid[1];
2223
2224                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2225                                          0, (u32) -1, true, 0,
2226                                          ifmgd->associated->channel, false);
2227                 rcu_read_unlock();
2228         }
2229
2230         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2231         run_again(sdata, ifmgd->probe_timeout);
2232 }
2233
2234 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2235                                    bool beacon)
2236 {
2237         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2238         bool already = false;
2239
2240         if (!ieee80211_sdata_running(sdata))
2241                 return;
2242
2243         sdata_lock(sdata);
2244
2245         if (!ifmgd->associated)
2246                 goto out;
2247
2248         mutex_lock(&sdata->local->mtx);
2249
2250         if (sdata->local->tmp_channel || sdata->local->scanning) {
2251                 mutex_unlock(&sdata->local->mtx);
2252                 goto out;
2253         }
2254
2255         if (beacon) {
2256                 mlme_dbg_ratelimited(sdata,
2257                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2258                                      beacon_loss_count);
2259
2260                 ieee80211_cqm_rssi_notify(&sdata->vif,
2261                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2262                                           GFP_KERNEL);
2263         }
2264
2265         /*
2266          * The driver/our work has already reported this event or the
2267          * connection monitoring has kicked in and we have already sent
2268          * a probe request. Or maybe the AP died and the driver keeps
2269          * reporting until we disassociate...
2270          *
2271          * In either case we have to ignore the current call to this
2272          * function (except for setting the correct probe reason bit)
2273          * because otherwise we would reset the timer every time and
2274          * never check whether we received a probe response!
2275          */
2276         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2277                 already = true;
2278
2279         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2280
2281         mutex_unlock(&sdata->local->mtx);
2282
2283         if (already)
2284                 goto out;
2285
2286         mutex_lock(&sdata->local->iflist_mtx);
2287         ieee80211_recalc_ps(sdata->local, -1);
2288         mutex_unlock(&sdata->local->iflist_mtx);
2289
2290         ifmgd->probe_send_count = 0;
2291         ieee80211_mgd_probe_ap_send(sdata);
2292  out:
2293         sdata_unlock(sdata);
2294 }
2295
2296 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2297                                           struct ieee80211_vif *vif)
2298 {
2299         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2300         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2301         struct cfg80211_bss *cbss;
2302         struct sk_buff *skb;
2303         const u8 *ssid;
2304         int ssid_len;
2305
2306         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2307                 return NULL;
2308
2309         sdata_assert_lock(sdata);
2310
2311         if (ifmgd->associated)
2312                 cbss = ifmgd->associated;
2313         else if (ifmgd->auth_data)
2314                 cbss = ifmgd->auth_data->bss;
2315         else if (ifmgd->assoc_data)
2316                 cbss = ifmgd->assoc_data->bss;
2317         else
2318                 return NULL;
2319
2320         rcu_read_lock();
2321         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2322         if (WARN_ON_ONCE(ssid == NULL))
2323                 ssid_len = 0;
2324         else
2325                 ssid_len = ssid[1];
2326
2327         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2328                                         (u32) -1, cbss->channel,
2329                                         ssid + 2, ssid_len,
2330                                         NULL, 0, true);
2331         rcu_read_unlock();
2332
2333         return skb;
2334 }
2335 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2336
2337 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2338 {
2339         struct ieee80211_local *local = sdata->local;
2340         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2341         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2342
2343         sdata_lock(sdata);
2344         if (!ifmgd->associated) {
2345                 sdata_unlock(sdata);
2346                 return;
2347         }
2348
2349         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2350                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2351                                true, frame_buf);
2352         mutex_lock(&local->mtx);
2353         sdata->vif.csa_active = false;
2354         ifmgd->csa_waiting_bcn = false;
2355         if (sdata->csa_block_tx) {
2356                 ieee80211_wake_vif_queues(local, sdata,
2357                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2358                 sdata->csa_block_tx = false;
2359         }
2360         mutex_unlock(&local->mtx);
2361
2362         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2363                               IEEE80211_DEAUTH_FRAME_LEN);
2364         sdata_unlock(sdata);
2365 }
2366
2367 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2368 {
2369         struct ieee80211_sub_if_data *sdata =
2370                 container_of(work, struct ieee80211_sub_if_data,
2371                              u.mgd.beacon_connection_loss_work);
2372         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2373         struct sta_info *sta;
2374
2375         if (ifmgd->associated) {
2376                 rcu_read_lock();
2377                 sta = sta_info_get(sdata, ifmgd->bssid);
2378                 if (sta)
2379                         sta->beacon_loss_count++;
2380                 rcu_read_unlock();
2381         }
2382
2383         if (ifmgd->connection_loss) {
2384                 sdata_info(sdata, "Connection to AP %pM lost\n",
2385                            ifmgd->bssid);
2386                 __ieee80211_disconnect(sdata);
2387         } else {
2388                 ieee80211_mgd_probe_ap(sdata, true);
2389         }
2390 }
2391
2392 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2393 {
2394         struct ieee80211_sub_if_data *sdata =
2395                 container_of(work, struct ieee80211_sub_if_data,
2396                              u.mgd.csa_connection_drop_work);
2397
2398         __ieee80211_disconnect(sdata);
2399 }
2400
2401 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2402 {
2403         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2404         struct ieee80211_hw *hw = &sdata->local->hw;
2405
2406         trace_api_beacon_loss(sdata);
2407
2408         sdata->u.mgd.connection_loss = false;
2409         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2410 }
2411 EXPORT_SYMBOL(ieee80211_beacon_loss);
2412
2413 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2414 {
2415         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2416         struct ieee80211_hw *hw = &sdata->local->hw;
2417
2418         trace_api_connection_loss(sdata);
2419
2420         sdata->u.mgd.connection_loss = true;
2421         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2422 }
2423 EXPORT_SYMBOL(ieee80211_connection_loss);
2424
2425
2426 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2427                                         bool assoc)
2428 {
2429         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2430
2431         sdata_assert_lock(sdata);
2432
2433         if (!assoc) {
2434                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2435
2436                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2437                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2438                 sdata->u.mgd.flags = 0;
2439                 mutex_lock(&sdata->local->mtx);
2440                 ieee80211_vif_release_channel(sdata);
2441                 mutex_unlock(&sdata->local->mtx);
2442         }
2443
2444         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2445         kfree(auth_data);
2446         sdata->u.mgd.auth_data = NULL;
2447 }
2448
2449 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2450                                      struct ieee80211_mgmt *mgmt, size_t len)
2451 {
2452         struct ieee80211_local *local = sdata->local;
2453         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2454         u8 *pos;
2455         struct ieee802_11_elems elems;
2456         u32 tx_flags = 0;
2457
2458         pos = mgmt->u.auth.variable;
2459         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2460         if (!elems.challenge)
2461                 return;
2462         auth_data->expected_transaction = 4;
2463         drv_mgd_prepare_tx(sdata->local, sdata);
2464         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2465                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2466                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2467         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2468                             elems.challenge - 2, elems.challenge_len + 2,
2469                             auth_data->bss->bssid, auth_data->bss->bssid,
2470                             auth_data->key, auth_data->key_len,
2471                             auth_data->key_idx, tx_flags);
2472 }
2473
2474 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2475                                    struct ieee80211_mgmt *mgmt, size_t len)
2476 {
2477         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2478         u8 bssid[ETH_ALEN];
2479         u16 auth_alg, auth_transaction, status_code;
2480         struct sta_info *sta;
2481
2482         sdata_assert_lock(sdata);
2483
2484         if (len < 24 + 6)
2485                 return;
2486
2487         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2488                 return;
2489
2490         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2491
2492         if (!ether_addr_equal(bssid, mgmt->bssid))
2493                 return;
2494
2495         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2496         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2497         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2498
2499         if (auth_alg != ifmgd->auth_data->algorithm ||
2500             auth_transaction != ifmgd->auth_data->expected_transaction) {
2501                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2502                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2503                            auth_transaction,
2504                            ifmgd->auth_data->expected_transaction);
2505                 return;
2506         }
2507
2508         if (status_code != WLAN_STATUS_SUCCESS) {
2509                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2510                            mgmt->sa, status_code);
2511                 ieee80211_destroy_auth_data(sdata, false);
2512                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2513                 return;
2514         }
2515
2516         switch (ifmgd->auth_data->algorithm) {
2517         case WLAN_AUTH_OPEN:
2518         case WLAN_AUTH_LEAP:
2519         case WLAN_AUTH_FT:
2520         case WLAN_AUTH_SAE:
2521                 break;
2522         case WLAN_AUTH_SHARED_KEY:
2523                 if (ifmgd->auth_data->expected_transaction != 4) {
2524                         ieee80211_auth_challenge(sdata, mgmt, len);
2525                         /* need another frame */
2526                         return;
2527                 }
2528                 break;
2529         default:
2530                 WARN_ONCE(1, "invalid auth alg %d",
2531                           ifmgd->auth_data->algorithm);
2532                 return;
2533         }
2534
2535         sdata_info(sdata, "authenticated\n");
2536         ifmgd->auth_data->done = true;
2537         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2538         ifmgd->auth_data->timeout_started = true;
2539         run_again(sdata, ifmgd->auth_data->timeout);
2540
2541         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2542             ifmgd->auth_data->expected_transaction != 2) {
2543                 /*
2544                  * Report auth frame to user space for processing since another
2545                  * round of Authentication frames is still needed.
2546                  */
2547                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2548                 return;
2549         }
2550
2551         /* move station state to auth */
2552         mutex_lock(&sdata->local->sta_mtx);
2553         sta = sta_info_get(sdata, bssid);
2554         if (!sta) {
2555                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2556                 goto out_err;
2557         }
2558         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2559                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2560                 goto out_err;
2561         }
2562         mutex_unlock(&sdata->local->sta_mtx);
2563
2564         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2565         return;
2566  out_err:
2567         mutex_unlock(&sdata->local->sta_mtx);
2568         /* ignore frame -- wait for timeout */
2569 }
2570
2571 #define case_WLAN(type) \
2572         case WLAN_REASON_##type: return #type
2573
2574 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2575 {
2576         switch (reason_code) {
2577         case_WLAN(UNSPECIFIED);
2578         case_WLAN(PREV_AUTH_NOT_VALID);
2579         case_WLAN(DEAUTH_LEAVING);
2580         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2581         case_WLAN(DISASSOC_AP_BUSY);
2582         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2583         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2584         case_WLAN(DISASSOC_STA_HAS_LEFT);
2585         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2586         case_WLAN(DISASSOC_BAD_POWER);
2587         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2588         case_WLAN(INVALID_IE);
2589         case_WLAN(MIC_FAILURE);
2590         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2591         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2592         case_WLAN(IE_DIFFERENT);
2593         case_WLAN(INVALID_GROUP_CIPHER);
2594         case_WLAN(INVALID_PAIRWISE_CIPHER);
2595         case_WLAN(INVALID_AKMP);
2596         case_WLAN(UNSUPP_RSN_VERSION);
2597         case_WLAN(INVALID_RSN_IE_CAP);
2598         case_WLAN(IEEE8021X_FAILED);
2599         case_WLAN(CIPHER_SUITE_REJECTED);
2600         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2601         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2602         case_WLAN(DISASSOC_LOW_ACK);
2603         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2604         case_WLAN(QSTA_LEAVE_QBSS);
2605         case_WLAN(QSTA_NOT_USE);
2606         case_WLAN(QSTA_REQUIRE_SETUP);
2607         case_WLAN(QSTA_TIMEOUT);
2608         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2609         case_WLAN(MESH_PEER_CANCELED);
2610         case_WLAN(MESH_MAX_PEERS);
2611         case_WLAN(MESH_CONFIG);
2612         case_WLAN(MESH_CLOSE);
2613         case_WLAN(MESH_MAX_RETRIES);
2614         case_WLAN(MESH_CONFIRM_TIMEOUT);
2615         case_WLAN(MESH_INVALID_GTK);
2616         case_WLAN(MESH_INCONSISTENT_PARAM);
2617         case_WLAN(MESH_INVALID_SECURITY);
2618         case_WLAN(MESH_PATH_ERROR);
2619         case_WLAN(MESH_PATH_NOFORWARD);
2620         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2621         case_WLAN(MAC_EXISTS_IN_MBSS);
2622         case_WLAN(MESH_CHAN_REGULATORY);
2623         case_WLAN(MESH_CHAN);
2624         default: return "<unknown>";
2625         }
2626 }
2627
2628 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2629                                      struct ieee80211_mgmt *mgmt, size_t len)
2630 {
2631         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2632         const u8 *bssid = NULL;
2633         u16 reason_code;
2634
2635         sdata_assert_lock(sdata);
2636
2637         if (len < 24 + 2)
2638                 return;
2639
2640         if (!ifmgd->associated ||
2641             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2642                 return;
2643
2644         bssid = ifmgd->associated->bssid;
2645
2646         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2647
2648         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2649                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2650
2651         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2652
2653         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2654 }
2655
2656
2657 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2658                                        struct ieee80211_mgmt *mgmt, size_t len)
2659 {
2660         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2661         u16 reason_code;
2662
2663         sdata_assert_lock(sdata);
2664
2665         if (len < 24 + 2)
2666                 return;
2667
2668         if (!ifmgd->associated ||
2669             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2670                 return;
2671
2672         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2673
2674         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2675                    mgmt->sa, reason_code);
2676
2677         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2678
2679         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2680 }
2681
2682 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2683                                 u8 *supp_rates, unsigned int supp_rates_len,
2684                                 u32 *rates, u32 *basic_rates,
2685                                 bool *have_higher_than_11mbit,
2686                                 int *min_rate, int *min_rate_index,
2687                                 int shift, u32 rate_flags)
2688 {
2689         int i, j;
2690
2691         for (i = 0; i < supp_rates_len; i++) {
2692                 int rate = supp_rates[i] & 0x7f;
2693                 bool is_basic = !!(supp_rates[i] & 0x80);
2694
2695                 if ((rate * 5 * (1 << shift)) > 110)
2696                         *have_higher_than_11mbit = true;
2697
2698                 /*
2699                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2700                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2701                  *
2702                  * Note: Even through the membership selector and the basic
2703                  *       rate flag share the same bit, they are not exactly
2704                  *       the same.
2705                  */
2706                 if (!!(supp_rates[i] & 0x80) &&
2707                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2708                         continue;
2709
2710                 for (j = 0; j < sband->n_bitrates; j++) {
2711                         struct ieee80211_rate *br;
2712                         int brate;
2713
2714                         br = &sband->bitrates[j];
2715                         if ((rate_flags & br->flags) != rate_flags)
2716                                 continue;
2717
2718                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2719                         if (brate == rate) {
2720                                 *rates |= BIT(j);
2721                                 if (is_basic)
2722                                         *basic_rates |= BIT(j);
2723                                 if ((rate * 5) < *min_rate) {
2724                                         *min_rate = rate * 5;
2725                                         *min_rate_index = j;
2726                                 }
2727                                 break;
2728                         }
2729                 }
2730         }
2731 }
2732
2733 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2734                                          bool assoc)
2735 {
2736         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2737
2738         sdata_assert_lock(sdata);
2739
2740         if (!assoc) {
2741                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2742
2743                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2744                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2745                 sdata->u.mgd.flags = 0;
2746                 mutex_lock(&sdata->local->mtx);
2747                 ieee80211_vif_release_channel(sdata);
2748                 mutex_unlock(&sdata->local->mtx);
2749         }
2750
2751         kfree(assoc_data);
2752         sdata->u.mgd.assoc_data = NULL;
2753 }
2754
2755 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2756                                     struct cfg80211_bss *cbss,
2757                                     struct ieee80211_mgmt *mgmt, size_t len)
2758 {
2759         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2760         struct ieee80211_local *local = sdata->local;
2761         struct ieee80211_supported_band *sband;
2762         struct sta_info *sta;
2763         u8 *pos;
2764         u16 capab_info, aid;
2765         struct ieee802_11_elems elems;
2766         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2767         const struct cfg80211_bss_ies *bss_ies = NULL;
2768         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2769         u32 changed = 0;
2770         int err;
2771         bool ret;
2772
2773         /* AssocResp and ReassocResp have identical structure */
2774
2775         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2776         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2777
2778         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2779                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2780                            aid);
2781         aid &= ~(BIT(15) | BIT(14));
2782
2783         ifmgd->broken_ap = false;
2784
2785         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2786                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2787                            aid);
2788                 aid = 0;
2789                 ifmgd->broken_ap = true;
2790         }
2791
2792         pos = mgmt->u.assoc_resp.variable;
2793         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2794
2795         if (!elems.supp_rates) {
2796                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2797                 return false;
2798         }
2799
2800         ifmgd->aid = aid;
2801
2802         /*
2803          * Some APs are erroneously not including some information in their
2804          * (re)association response frames. Try to recover by using the data
2805          * from the beacon or probe response. This seems to afflict mobile
2806          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2807          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2808          */
2809         if ((assoc_data->wmm && !elems.wmm_param) ||
2810             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2811              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2812             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2813              (!elems.vht_cap_elem || !elems.vht_operation))) {
2814                 const struct cfg80211_bss_ies *ies;
2815                 struct ieee802_11_elems bss_elems;
2816
2817                 rcu_read_lock();
2818                 ies = rcu_dereference(cbss->ies);
2819                 if (ies)
2820                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2821                                           GFP_ATOMIC);
2822                 rcu_read_unlock();
2823                 if (!bss_ies)
2824                         return false;
2825
2826                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2827                                        false, &bss_elems);
2828                 if (assoc_data->wmm &&
2829                     !elems.wmm_param && bss_elems.wmm_param) {
2830                         elems.wmm_param = bss_elems.wmm_param;
2831                         sdata_info(sdata,
2832                                    "AP bug: WMM param missing from AssocResp\n");
2833                 }
2834
2835                 /*
2836                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2837                  * have to include the IEs in the (re)association response.
2838                  */
2839                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2840                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2841                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2842                         sdata_info(sdata,
2843                                    "AP bug: HT capability missing from AssocResp\n");
2844                 }
2845                 if (!elems.ht_operation && bss_elems.ht_operation &&
2846                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2847                         elems.ht_operation = bss_elems.ht_operation;
2848                         sdata_info(sdata,
2849                                    "AP bug: HT operation missing from AssocResp\n");
2850                 }
2851                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2852                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2853                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2854                         sdata_info(sdata,
2855                                    "AP bug: VHT capa missing from AssocResp\n");
2856                 }
2857                 if (!elems.vht_operation && bss_elems.vht_operation &&
2858                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2859                         elems.vht_operation = bss_elems.vht_operation;
2860                         sdata_info(sdata,
2861                                    "AP bug: VHT operation missing from AssocResp\n");
2862                 }
2863         }
2864
2865         /*
2866          * We previously checked these in the beacon/probe response, so
2867          * they should be present here. This is just a safety net.
2868          */
2869         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2870             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2871                 sdata_info(sdata,
2872                            "HT AP is missing WMM params or HT capability/operation\n");
2873                 ret = false;
2874                 goto out;
2875         }
2876
2877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2878             (!elems.vht_cap_elem || !elems.vht_operation)) {
2879                 sdata_info(sdata,
2880                            "VHT AP is missing VHT capability/operation\n");
2881                 ret = false;
2882                 goto out;
2883         }
2884
2885         mutex_lock(&sdata->local->sta_mtx);
2886         /*
2887          * station info was already allocated and inserted before
2888          * the association and should be available to us
2889          */
2890         sta = sta_info_get(sdata, cbss->bssid);
2891         if (WARN_ON(!sta)) {
2892                 mutex_unlock(&sdata->local->sta_mtx);
2893                 ret = false;
2894                 goto out;
2895         }
2896
2897         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2898
2899         /* Set up internal HT/VHT capabilities */
2900         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2901                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2902                                                   elems.ht_cap_elem, sta);
2903
2904         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2905                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2906                                                     elems.vht_cap_elem, sta);
2907
2908         /*
2909          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2910          * in their association response, so ignore that data for our own
2911          * configuration. If it changed since the last beacon, we'll get the
2912          * next beacon and update then.
2913          */
2914
2915         /*
2916          * If an operating mode notification IE is present, override the
2917          * NSS calculation (that would be done in rate_control_rate_init())
2918          * and use the # of streams from that element.
2919          */
2920         if (elems.opmode_notif &&
2921             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2922                 u8 nss;
2923
2924                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2925                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2926                 nss += 1;
2927                 sta->sta.rx_nss = nss;
2928         }
2929
2930         rate_control_rate_init(sta);
2931
2932         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2933                 set_sta_flag(sta, WLAN_STA_MFP);
2934
2935         sta->sta.wme = elems.wmm_param;
2936
2937         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2938         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2939                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2940         if (err) {
2941                 sdata_info(sdata,
2942                            "failed to move station %pM to desired state\n",
2943                            sta->sta.addr);
2944                 WARN_ON(__sta_info_destroy(sta));
2945                 mutex_unlock(&sdata->local->sta_mtx);
2946                 ret = false;
2947                 goto out;
2948         }
2949
2950         mutex_unlock(&sdata->local->sta_mtx);
2951
2952         /*
2953          * Always handle WMM once after association regardless
2954          * of the first value the AP uses. Setting -1 here has
2955          * that effect because the AP values is an unsigned
2956          * 4-bit value.
2957          */
2958         ifmgd->wmm_last_param_set = -1;
2959
2960         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2961                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2962                                          elems.wmm_param_len);
2963         else
2964                 ieee80211_set_wmm_default(sdata, false);
2965         changed |= BSS_CHANGED_QOS;
2966
2967         /* set AID and assoc capability,
2968          * ieee80211_set_associated() will tell the driver */
2969         bss_conf->aid = aid;
2970         bss_conf->assoc_capability = capab_info;
2971         ieee80211_set_associated(sdata, cbss, changed);
2972
2973         /*
2974          * If we're using 4-addr mode, let the AP know that we're
2975          * doing so, so that it can create the STA VLAN on its side
2976          */
2977         if (ifmgd->use_4addr)
2978                 ieee80211_send_4addr_nullfunc(local, sdata);
2979
2980         /*
2981          * Start timer to probe the connection to the AP now.
2982          * Also start the timer that will detect beacon loss.
2983          */
2984         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2985         ieee80211_sta_reset_beacon_monitor(sdata);
2986
2987         ret = true;
2988  out:
2989         kfree(bss_ies);
2990         return ret;
2991 }
2992
2993 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2994                                          struct ieee80211_mgmt *mgmt,
2995                                          size_t len)
2996 {
2997         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2998         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2999         u16 capab_info, status_code, aid;
3000         struct ieee802_11_elems elems;
3001         int ac, uapsd_queues = -1;
3002         u8 *pos;
3003         bool reassoc;
3004         struct cfg80211_bss *bss;
3005
3006         sdata_assert_lock(sdata);
3007
3008         if (!assoc_data)
3009                 return;
3010         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3011                 return;
3012
3013         /*
3014          * AssocResp and ReassocResp have identical structure, so process both
3015          * of them in this function.
3016          */
3017
3018         if (len < 24 + 6)
3019                 return;
3020
3021         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3022         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3023         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3024         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3025
3026         sdata_info(sdata,
3027                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3028                    reassoc ? "Rea" : "A", mgmt->sa,
3029                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3030
3031         pos = mgmt->u.assoc_resp.variable;
3032         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3033
3034         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3035             elems.timeout_int &&
3036             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3037                 u32 tu, ms;
3038                 tu = le32_to_cpu(elems.timeout_int->value);
3039                 ms = tu * 1024 / 1000;
3040                 sdata_info(sdata,
3041                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3042                            mgmt->sa, tu, ms);
3043                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3044                 assoc_data->timeout_started = true;
3045                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3046                         run_again(sdata, assoc_data->timeout);
3047                 return;
3048         }
3049
3050         bss = assoc_data->bss;
3051
3052         if (status_code != WLAN_STATUS_SUCCESS) {
3053                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3054                            mgmt->sa, status_code);
3055                 ieee80211_destroy_assoc_data(sdata, false);
3056         } else {
3057                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3058                         /* oops -- internal error -- send timeout for now */
3059                         ieee80211_destroy_assoc_data(sdata, false);
3060                         cfg80211_assoc_timeout(sdata->dev, bss);
3061                         return;
3062                 }
3063                 sdata_info(sdata, "associated\n");
3064
3065                 /*
3066                  * destroy assoc_data afterwards, as otherwise an idle
3067                  * recalc after assoc_data is NULL but before associated
3068                  * is set can cause the interface to go idle
3069                  */
3070                 ieee80211_destroy_assoc_data(sdata, true);
3071
3072                 /* get uapsd queues configuration */
3073                 uapsd_queues = 0;
3074                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3075                         if (sdata->tx_conf[ac].uapsd)
3076                                 uapsd_queues |= BIT(ac);
3077         }
3078
3079         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3080 }
3081
3082 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3083                                   struct ieee80211_mgmt *mgmt, size_t len,
3084                                   struct ieee80211_rx_status *rx_status,
3085                                   struct ieee802_11_elems *elems)
3086 {
3087         struct ieee80211_local *local = sdata->local;
3088         struct ieee80211_bss *bss;
3089         struct ieee80211_channel *channel;
3090
3091         sdata_assert_lock(sdata);
3092
3093         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3094         if (!channel)
3095                 return;
3096
3097         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3098                                         channel);
3099         if (bss) {
3100                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3101                 ieee80211_rx_bss_put(local, bss);
3102         }
3103 }
3104
3105
3106 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3107                                          struct sk_buff *skb)
3108 {
3109         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3110         struct ieee80211_if_managed *ifmgd;
3111         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3112         size_t baselen, len = skb->len;
3113         struct ieee802_11_elems elems;
3114
3115         ifmgd = &sdata->u.mgd;
3116
3117         sdata_assert_lock(sdata);
3118
3119         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3120                 return; /* ignore ProbeResp to foreign address */
3121
3122         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3123         if (baselen > len)
3124                 return;
3125
3126         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3127                                false, &elems);
3128
3129         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3130
3131         if (ifmgd->associated &&
3132             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3133                 ieee80211_reset_ap_probe(sdata);
3134
3135         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3136             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3137                 /* got probe response, continue with auth */
3138                 sdata_info(sdata, "direct probe responded\n");
3139                 ifmgd->auth_data->tries = 0;
3140                 ifmgd->auth_data->timeout = jiffies;
3141                 ifmgd->auth_data->timeout_started = true;
3142                 run_again(sdata, ifmgd->auth_data->timeout);
3143         }
3144 }
3145
3146 /*
3147  * This is the canonical list of information elements we care about,
3148  * the filter code also gives us all changes to the Microsoft OUI
3149  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3150  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3151  * changes to requested client power.
3152  *
3153  * We implement beacon filtering in software since that means we can
3154  * avoid processing the frame here and in cfg80211, and userspace
3155  * will not be able to tell whether the hardware supports it or not.
3156  *
3157  * XXX: This list needs to be dynamic -- userspace needs to be able to
3158  *      add items it requires. It also needs to be able to tell us to
3159  *      look out for other vendor IEs.
3160  */
3161 static const u64 care_about_ies =
3162         (1ULL << WLAN_EID_COUNTRY) |
3163         (1ULL << WLAN_EID_ERP_INFO) |
3164         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3165         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3166         (1ULL << WLAN_EID_HT_CAPABILITY) |
3167         (1ULL << WLAN_EID_HT_OPERATION);
3168
3169 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3170                                      struct ieee80211_mgmt *mgmt, size_t len,
3171                                      struct ieee80211_rx_status *rx_status)
3172 {
3173         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3174         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3175         size_t baselen;
3176         struct ieee802_11_elems elems;
3177         struct ieee80211_local *local = sdata->local;
3178         struct ieee80211_chanctx_conf *chanctx_conf;
3179         struct ieee80211_channel *chan;
3180         struct sta_info *sta;
3181         u32 changed = 0;
3182         bool erp_valid;
3183         u8 erp_value = 0;
3184         u32 ncrc;
3185         u8 *bssid;
3186         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3187
3188         sdata_assert_lock(sdata);
3189
3190         /* Process beacon from the current BSS */
3191         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3192         if (baselen > len)
3193                 return;
3194
3195         rcu_read_lock();
3196         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3197         if (!chanctx_conf) {
3198                 rcu_read_unlock();
3199                 return;
3200         }
3201
3202         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3203                 rcu_read_unlock();
3204                 return;
3205         }
3206         chan = chanctx_conf->def.chan;
3207         rcu_read_unlock();
3208
3209         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3210             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3211                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3212                                        len - baselen, false, &elems);
3213
3214                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3215                 if (elems.tim && !elems.parse_error) {
3216                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3217                         ifmgd->dtim_period = tim_ie->dtim_period;
3218                 }
3219                 ifmgd->have_beacon = true;
3220                 ifmgd->assoc_data->need_beacon = false;
3221                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3222                         sdata->vif.bss_conf.sync_tsf =
3223                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3224                         sdata->vif.bss_conf.sync_device_ts =
3225                                 rx_status->device_timestamp;
3226                         if (elems.tim)
3227                                 sdata->vif.bss_conf.sync_dtim_count =
3228                                         elems.tim->dtim_count;
3229                         else
3230                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3231                 }
3232                 /* continue assoc process */
3233                 ifmgd->assoc_data->timeout = jiffies;
3234                 ifmgd->assoc_data->timeout_started = true;
3235                 run_again(sdata, ifmgd->assoc_data->timeout);
3236                 return;
3237         }
3238
3239         if (!ifmgd->associated ||
3240             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3241                 return;
3242         bssid = ifmgd->associated->bssid;
3243
3244         /* Track average RSSI from the Beacon frames of the current AP */
3245         ifmgd->last_beacon_signal = rx_status->signal;
3246         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3247                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3248                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3249                 ifmgd->last_cqm_event_signal = 0;
3250                 ifmgd->count_beacon_signal = 1;
3251                 ifmgd->last_ave_beacon_signal = 0;
3252         } else {
3253                 ifmgd->ave_beacon_signal =
3254                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3255                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3256                          ifmgd->ave_beacon_signal) / 16;
3257                 ifmgd->count_beacon_signal++;
3258         }
3259
3260         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3261             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3262                 int sig = ifmgd->ave_beacon_signal;
3263                 int last_sig = ifmgd->last_ave_beacon_signal;
3264
3265                 /*
3266                  * if signal crosses either of the boundaries, invoke callback
3267                  * with appropriate parameters
3268                  */
3269                 if (sig > ifmgd->rssi_max_thold &&
3270                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3271                         ifmgd->last_ave_beacon_signal = sig;
3272                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3273                 } else if (sig < ifmgd->rssi_min_thold &&
3274                            (last_sig >= ifmgd->rssi_max_thold ||
3275                            last_sig == 0)) {
3276                         ifmgd->last_ave_beacon_signal = sig;
3277                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3278                 }
3279         }
3280
3281         if (bss_conf->cqm_rssi_thold &&
3282             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3283             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3284                 int sig = ifmgd->ave_beacon_signal / 16;
3285                 int last_event = ifmgd->last_cqm_event_signal;
3286                 int thold = bss_conf->cqm_rssi_thold;
3287                 int hyst = bss_conf->cqm_rssi_hyst;
3288                 if (sig < thold &&
3289                     (last_event == 0 || sig < last_event - hyst)) {
3290                         ifmgd->last_cqm_event_signal = sig;
3291                         ieee80211_cqm_rssi_notify(
3292                                 &sdata->vif,
3293                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3294                                 GFP_KERNEL);
3295                 } else if (sig > thold &&
3296                            (last_event == 0 || sig > last_event + hyst)) {
3297                         ifmgd->last_cqm_event_signal = sig;
3298                         ieee80211_cqm_rssi_notify(
3299                                 &sdata->vif,
3300                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3301                                 GFP_KERNEL);
3302                 }
3303         }
3304
3305         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3306                 mlme_dbg_ratelimited(sdata,
3307                                      "cancelling AP probe due to a received beacon\n");
3308                 ieee80211_reset_ap_probe(sdata);
3309         }
3310
3311         /*
3312          * Push the beacon loss detection into the future since
3313          * we are processing a beacon from the AP just now.
3314          */
3315         ieee80211_sta_reset_beacon_monitor(sdata);
3316
3317         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3318         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3319                                           len - baselen, false, &elems,
3320                                           care_about_ies, ncrc);
3321
3322         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3323                 bool directed_tim = ieee80211_check_tim(elems.tim,
3324                                                         elems.tim_len,
3325                                                         ifmgd->aid);
3326                 if (directed_tim) {
3327                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3328                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3329                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3330                                         ieee80211_hw_config(local,
3331                                                             IEEE80211_CONF_CHANGE_PS);
3332                                 }
3333                                 ieee80211_send_nullfunc(local, sdata, 0);
3334                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3335                                 local->pspolling = true;
3336
3337                                 /*
3338                                  * Here is assumed that the driver will be
3339                                  * able to send ps-poll frame and receive a
3340                                  * response even though power save mode is
3341                                  * enabled, but some drivers might require
3342                                  * to disable power save here. This needs
3343                                  * to be investigated.
3344                                  */
3345                                 ieee80211_send_pspoll(local, sdata);
3346                         }
3347                 }
3348         }
3349
3350         if (sdata->vif.p2p) {
3351                 struct ieee80211_p2p_noa_attr noa = {};
3352                 int ret;
3353
3354                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3355                                             len - baselen,
3356                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3357                                             (u8 *) &noa, sizeof(noa));
3358                 if (ret >= 2) {
3359                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3360                                 /* valid noa_attr and index changed */
3361                                 sdata->u.mgd.p2p_noa_index = noa.index;
3362                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3363                                 changed |= BSS_CHANGED_P2P_PS;
3364                                 /*
3365                                  * make sure we update all information, the CRC
3366                                  * mechanism doesn't look at P2P attributes.
3367                                  */
3368                                 ifmgd->beacon_crc_valid = false;
3369                         }
3370                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3371                         /* noa_attr not found and we had valid noa_attr before */
3372                         sdata->u.mgd.p2p_noa_index = -1;
3373                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3374                         changed |= BSS_CHANGED_P2P_PS;
3375                         ifmgd->beacon_crc_valid = false;
3376                 }
3377         }
3378
3379         if (ifmgd->csa_waiting_bcn)
3380                 ieee80211_chswitch_post_beacon(sdata);
3381
3382         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3383                 return;
3384         ifmgd->beacon_crc = ncrc;
3385         ifmgd->beacon_crc_valid = true;
3386
3387         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3388
3389         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3390                                          rx_status->device_timestamp,
3391                                          &elems, true);
3392
3393         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3394             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3395                                      elems.wmm_param_len))
3396                 changed |= BSS_CHANGED_QOS;
3397
3398         /*
3399          * If we haven't had a beacon before, tell the driver about the
3400          * DTIM period (and beacon timing if desired) now.
3401          */
3402         if (!ifmgd->have_beacon) {
3403                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3404                 if (elems.tim)
3405                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3406                 else
3407                         bss_conf->dtim_period = 1;
3408
3409                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3410                         sdata->vif.bss_conf.sync_tsf =
3411                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3412                         sdata->vif.bss_conf.sync_device_ts =
3413                                 rx_status->device_timestamp;
3414                         if (elems.tim)
3415                                 sdata->vif.bss_conf.sync_dtim_count =
3416                                         elems.tim->dtim_count;
3417                         else
3418                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3419                 }
3420
3421                 changed |= BSS_CHANGED_BEACON_INFO;
3422                 ifmgd->have_beacon = true;
3423
3424                 mutex_lock(&local->iflist_mtx);
3425                 ieee80211_recalc_ps(local, -1);
3426                 mutex_unlock(&local->iflist_mtx);
3427
3428                 ieee80211_recalc_ps_vif(sdata);
3429         }
3430
3431         if (elems.erp_info) {
3432                 erp_valid = true;
3433                 erp_value = elems.erp_info[0];
3434         } else {
3435                 erp_valid = false;
3436         }
3437         changed |= ieee80211_handle_bss_capability(sdata,
3438                         le16_to_cpu(mgmt->u.beacon.capab_info),
3439                         erp_valid, erp_value);
3440
3441         mutex_lock(&local->sta_mtx);
3442         sta = sta_info_get(sdata, bssid);
3443
3444         if (ieee80211_config_bw(sdata, sta,
3445                                 elems.ht_cap_elem, elems.ht_operation,
3446                                 elems.vht_operation, bssid, &changed)) {
3447                 mutex_unlock(&local->sta_mtx);
3448                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3449                                        WLAN_REASON_DEAUTH_LEAVING,
3450                                        true, deauth_buf);
3451                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3452                                       sizeof(deauth_buf));
3453                 return;
3454         }
3455
3456         if (sta && elems.opmode_notif)
3457                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3458                                             rx_status->band, true);
3459         mutex_unlock(&local->sta_mtx);
3460
3461         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3462                                                elems.country_elem,
3463                                                elems.country_elem_len,
3464                                                elems.pwr_constr_elem,
3465                                                elems.cisco_dtpc_elem);
3466
3467         ieee80211_bss_info_change_notify(sdata, changed);
3468 }
3469
3470 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3471                                   struct sk_buff *skb)
3472 {
3473         struct ieee80211_rx_status *rx_status;
3474         struct ieee80211_mgmt *mgmt;
3475         u16 fc;
3476         struct ieee802_11_elems elems;
3477         int ies_len;
3478
3479         rx_status = (struct ieee80211_rx_status *) skb->cb;
3480         mgmt = (struct ieee80211_mgmt *) skb->data;
3481         fc = le16_to_cpu(mgmt->frame_control);
3482
3483         sdata_lock(sdata);
3484
3485         switch (fc & IEEE80211_FCTL_STYPE) {
3486         case IEEE80211_STYPE_BEACON:
3487                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3488                 break;
3489         case IEEE80211_STYPE_PROBE_RESP:
3490                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3491                 break;
3492         case IEEE80211_STYPE_AUTH:
3493                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3494                 break;
3495         case IEEE80211_STYPE_DEAUTH:
3496                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3497                 break;
3498         case IEEE80211_STYPE_DISASSOC:
3499                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3500                 break;
3501         case IEEE80211_STYPE_ASSOC_RESP:
3502         case IEEE80211_STYPE_REASSOC_RESP:
3503                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3504                 break;
3505         case IEEE80211_STYPE_ACTION:
3506                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3507                         ies_len = skb->len -
3508                                   offsetof(struct ieee80211_mgmt,
3509                                            u.action.u.chan_switch.variable);
3510
3511                         if (ies_len < 0)
3512                                 break;
3513
3514                         ieee802_11_parse_elems(
3515                                 mgmt->u.action.u.chan_switch.variable,
3516                                 ies_len, true, &elems);
3517
3518                         if (elems.parse_error)
3519                                 break;
3520
3521                         ieee80211_sta_process_chanswitch(sdata,
3522                                                  rx_status->mactime,
3523                                                  rx_status->device_timestamp,
3524                                                  &elems, false);
3525                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3526                         ies_len = skb->len -
3527                                   offsetof(struct ieee80211_mgmt,
3528                                            u.action.u.ext_chan_switch.variable);
3529
3530                         if (ies_len < 0)
3531                                 break;
3532
3533                         ieee802_11_parse_elems(
3534                                 mgmt->u.action.u.ext_chan_switch.variable,
3535                                 ies_len, true, &elems);
3536
3537                         if (elems.parse_error)
3538                                 break;
3539
3540                         /* for the handling code pretend this was also an IE */
3541                         elems.ext_chansw_ie =
3542                                 &mgmt->u.action.u.ext_chan_switch.data;
3543
3544                         ieee80211_sta_process_chanswitch(sdata,
3545                                                  rx_status->mactime,
3546                                                  rx_status->device_timestamp,
3547                                                  &elems, false);
3548                 }
3549                 break;
3550         }
3551         sdata_unlock(sdata);
3552 }
3553
3554 static void ieee80211_sta_timer(unsigned long data)
3555 {
3556         struct ieee80211_sub_if_data *sdata =
3557                 (struct ieee80211_sub_if_data *) data;
3558
3559         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3560 }
3561
3562 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3563                                           u8 *bssid, u8 reason, bool tx)
3564 {
3565         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3566
3567         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3568                                tx, frame_buf);
3569
3570         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3571                               IEEE80211_DEAUTH_FRAME_LEN);
3572 }
3573
3574 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3575 {
3576         struct ieee80211_local *local = sdata->local;
3577         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3578         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3579         u32 tx_flags = 0;
3580
3581         sdata_assert_lock(sdata);
3582
3583         if (WARN_ON_ONCE(!auth_data))
3584                 return -EINVAL;
3585
3586         auth_data->tries++;
3587
3588         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3589                 sdata_info(sdata, "authentication with %pM timed out\n",
3590                            auth_data->bss->bssid);
3591
3592                 /*
3593                  * Most likely AP is not in the range so remove the
3594                  * bss struct for that AP.
3595                  */
3596                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3597
3598                 return -ETIMEDOUT;
3599         }
3600
3601         drv_mgd_prepare_tx(local, sdata);
3602
3603         if (auth_data->bss->proberesp_ies) {
3604                 u16 trans = 1;
3605                 u16 status = 0;
3606
3607                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3608                            auth_data->bss->bssid, auth_data->tries,
3609                            IEEE80211_AUTH_MAX_TRIES);
3610
3611                 auth_data->expected_transaction = 2;
3612
3613                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3614                         trans = auth_data->sae_trans;
3615                         status = auth_data->sae_status;
3616                         auth_data->expected_transaction = trans;
3617                 }
3618
3619                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3620                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3621                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3622
3623                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3624                                     auth_data->data, auth_data->data_len,
3625                                     auth_data->bss->bssid,
3626                                     auth_data->bss->bssid, NULL, 0, 0,
3627                                     tx_flags);
3628         } else {
3629                 const u8 *ssidie;
3630
3631                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3632                            auth_data->bss->bssid, auth_data->tries,
3633                            IEEE80211_AUTH_MAX_TRIES);
3634
3635                 rcu_read_lock();
3636                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3637                 if (!ssidie) {
3638                         rcu_read_unlock();
3639                         return -EINVAL;
3640                 }
3641                 /*
3642                  * Direct probe is sent to broadcast address as some APs
3643                  * will not answer to direct packet in unassociated state.
3644                  */
3645                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3646                                          NULL, 0, (u32) -1, true, 0,
3647                                          auth_data->bss->channel, false);
3648                 rcu_read_unlock();
3649         }
3650
3651         if (tx_flags == 0) {
3652                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3653                 auth_data->timeout_started = true;
3654                 run_again(sdata, auth_data->timeout);
3655         } else {
3656                 auth_data->timeout =
3657                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3658                 auth_data->timeout_started = true;
3659                 run_again(sdata, auth_data->timeout);
3660         }
3661
3662         return 0;
3663 }
3664
3665 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3666 {
3667         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3668         struct ieee80211_local *local = sdata->local;
3669
3670         sdata_assert_lock(sdata);
3671
3672         assoc_data->tries++;
3673         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3674                 sdata_info(sdata, "association with %pM timed out\n",
3675                            assoc_data->bss->bssid);
3676
3677                 /*
3678                  * Most likely AP is not in the range so remove the
3679                  * bss struct for that AP.
3680                  */
3681                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3682
3683                 return -ETIMEDOUT;
3684         }
3685
3686         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3687                    assoc_data->bss->bssid, assoc_data->tries,
3688                    IEEE80211_ASSOC_MAX_TRIES);
3689         ieee80211_send_assoc(sdata);
3690
3691         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3692                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3693                 assoc_data->timeout_started = true;
3694                 run_again(sdata, assoc_data->timeout);
3695         } else {
3696                 assoc_data->timeout =
3697                         round_jiffies_up(jiffies +
3698                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3699                 assoc_data->timeout_started = true;
3700                 run_again(sdata, assoc_data->timeout);
3701         }
3702
3703         return 0;
3704 }
3705
3706 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3707                                   __le16 fc, bool acked)
3708 {
3709         struct ieee80211_local *local = sdata->local;
3710
3711         sdata->u.mgd.status_fc = fc;
3712         sdata->u.mgd.status_acked = acked;
3713         sdata->u.mgd.status_received = true;
3714
3715         ieee80211_queue_work(&local->hw, &sdata->work);
3716 }
3717
3718 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3719 {
3720         struct ieee80211_local *local = sdata->local;
3721         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3722
3723         sdata_lock(sdata);
3724
3725         if (ifmgd->status_received) {
3726                 __le16 fc = ifmgd->status_fc;
3727                 bool status_acked = ifmgd->status_acked;
3728
3729                 ifmgd->status_received = false;
3730                 if (ifmgd->auth_data &&
3731                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3732                         if (status_acked) {
3733                                 ifmgd->auth_data->timeout =
3734                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3735                                 run_again(sdata, ifmgd->auth_data->timeout);
3736                         } else {
3737                                 ifmgd->auth_data->timeout = jiffies - 1;
3738                         }
3739                         ifmgd->auth_data->timeout_started = true;
3740                 } else if (ifmgd->assoc_data &&
3741                            (ieee80211_is_assoc_req(fc) ||
3742                             ieee80211_is_reassoc_req(fc))) {
3743                         if (status_acked) {
3744                                 ifmgd->assoc_data->timeout =
3745                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3746                                 run_again(sdata, ifmgd->assoc_data->timeout);
3747                         } else {
3748                                 ifmgd->assoc_data->timeout = jiffies - 1;
3749                         }
3750                         ifmgd->assoc_data->timeout_started = true;
3751                 }
3752         }
3753
3754         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3755             time_after(jiffies, ifmgd->auth_data->timeout)) {
3756                 if (ifmgd->auth_data->done) {
3757                         /*
3758                          * ok ... we waited for assoc but userspace didn't,
3759                          * so let's just kill the auth data
3760                          */
3761                         ieee80211_destroy_auth_data(sdata, false);
3762                 } else if (ieee80211_probe_auth(sdata)) {
3763                         u8 bssid[ETH_ALEN];
3764
3765                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3766
3767                         ieee80211_destroy_auth_data(sdata, false);
3768
3769                         cfg80211_auth_timeout(sdata->dev, bssid);
3770                 }
3771         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3772                 run_again(sdata, ifmgd->auth_data->timeout);
3773
3774         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3775             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3776                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3777                     ieee80211_do_assoc(sdata)) {
3778                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3779
3780                         ieee80211_destroy_assoc_data(sdata, false);
3781                         cfg80211_assoc_timeout(sdata->dev, bss);
3782                 }
3783         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3784                 run_again(sdata, ifmgd->assoc_data->timeout);
3785
3786         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3787             ifmgd->associated) {
3788                 u8 bssid[ETH_ALEN];
3789                 int max_tries;
3790
3791                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3792
3793                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3794                         max_tries = max_nullfunc_tries;
3795                 else
3796                         max_tries = max_probe_tries;
3797
3798                 /* ACK received for nullfunc probing frame */
3799                 if (!ifmgd->probe_send_count)
3800                         ieee80211_reset_ap_probe(sdata);
3801                 else if (ifmgd->nullfunc_failed) {
3802                         if (ifmgd->probe_send_count < max_tries) {
3803                                 mlme_dbg(sdata,
3804                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3805                                          bssid, ifmgd->probe_send_count,
3806                                          max_tries);
3807                                 ieee80211_mgd_probe_ap_send(sdata);
3808                         } else {
3809                                 mlme_dbg(sdata,
3810                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3811                                          bssid);
3812                                 ieee80211_sta_connection_lost(sdata, bssid,
3813                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3814                                         false);
3815                         }
3816                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3817                         run_again(sdata, ifmgd->probe_timeout);
3818                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3819                         mlme_dbg(sdata,
3820                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3821                                  bssid, probe_wait_ms);
3822                         ieee80211_sta_connection_lost(sdata, bssid,
3823                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3824                 } else if (ifmgd->probe_send_count < max_tries) {
3825                         mlme_dbg(sdata,
3826                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3827                                  bssid, probe_wait_ms,
3828                                  ifmgd->probe_send_count, max_tries);
3829                         ieee80211_mgd_probe_ap_send(sdata);
3830                 } else {
3831                         /*
3832                          * We actually lost the connection ... or did we?
3833                          * Let's make sure!
3834                          */
3835                         wiphy_debug(local->hw.wiphy,
3836                                     "%s: No probe response from AP %pM"
3837                                     " after %dms, disconnecting.\n",
3838                                     sdata->name,
3839                                     bssid, probe_wait_ms);
3840
3841                         ieee80211_sta_connection_lost(sdata, bssid,
3842                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3843                 }
3844         }
3845
3846         sdata_unlock(sdata);
3847 }
3848
3849 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3850 {
3851         struct ieee80211_sub_if_data *sdata =
3852                 (struct ieee80211_sub_if_data *) data;
3853         struct ieee80211_local *local = sdata->local;
3854         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3855
3856         if (local->quiescing)
3857                 return;
3858
3859         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3860                 return;
3861
3862         sdata->u.mgd.connection_loss = false;
3863         ieee80211_queue_work(&sdata->local->hw,
3864                              &sdata->u.mgd.beacon_connection_loss_work);
3865 }
3866
3867 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3868 {
3869         struct ieee80211_sub_if_data *sdata =
3870                 (struct ieee80211_sub_if_data *) data;
3871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3872         struct ieee80211_local *local = sdata->local;
3873
3874         if (local->quiescing)
3875                 return;
3876
3877         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3878                 return;
3879
3880         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3881 }
3882
3883 static void ieee80211_sta_monitor_work(struct work_struct *work)
3884 {
3885         struct ieee80211_sub_if_data *sdata =
3886                 container_of(work, struct ieee80211_sub_if_data,
3887                              u.mgd.monitor_work);
3888
3889         ieee80211_mgd_probe_ap(sdata, false);
3890 }
3891
3892 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3893 {
3894         u32 flags;
3895
3896         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3897                 __ieee80211_stop_poll(sdata);
3898
3899                 /* let's probe the connection once */
3900                 flags = sdata->local->hw.flags;
3901                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3902                         ieee80211_queue_work(&sdata->local->hw,
3903                                              &sdata->u.mgd.monitor_work);
3904                 /* and do all the other regular work too */
3905                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3906         }
3907 }
3908
3909 #ifdef CONFIG_PM
3910 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3911 {
3912         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3913         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3914
3915         sdata_lock(sdata);
3916
3917         if (ifmgd->auth_data || ifmgd->assoc_data) {
3918                 const u8 *bssid = ifmgd->auth_data ?
3919                                 ifmgd->auth_data->bss->bssid :
3920                                 ifmgd->assoc_data->bss->bssid;
3921
3922                 /*
3923                  * If we are trying to authenticate / associate while suspending,
3924                  * cfg80211 won't know and won't actually abort those attempts,
3925                  * thus we need to do that ourselves.
3926                  */
3927                 ieee80211_send_deauth_disassoc(sdata, bssid,
3928                                                IEEE80211_STYPE_DEAUTH,
3929                                                WLAN_REASON_DEAUTH_LEAVING,
3930                                                false, frame_buf);
3931                 if (ifmgd->assoc_data)
3932                         ieee80211_destroy_assoc_data(sdata, false);
3933                 if (ifmgd->auth_data)
3934                         ieee80211_destroy_auth_data(sdata, false);
3935                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3936                                       IEEE80211_DEAUTH_FRAME_LEN);
3937         }
3938
3939         sdata_unlock(sdata);
3940 }
3941
3942 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3943 {
3944         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3945
3946         sdata_lock(sdata);
3947         if (!ifmgd->associated) {
3948                 sdata_unlock(sdata);
3949                 return;
3950         }
3951
3952         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3953                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3954                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3955                 ieee80211_sta_connection_lost(sdata,
3956                                               ifmgd->associated->bssid,
3957                                               WLAN_REASON_UNSPECIFIED,
3958                                               true);
3959                 sdata_unlock(sdata);
3960                 return;
3961         }
3962         sdata_unlock(sdata);
3963 }
3964 #endif
3965
3966 /* interface setup */
3967 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3968 {
3969         struct ieee80211_if_managed *ifmgd;
3970
3971         ifmgd = &sdata->u.mgd;
3972         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3973         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3974         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3975                   ieee80211_beacon_connection_loss_work);
3976         INIT_WORK(&ifmgd->csa_connection_drop_work,
3977                   ieee80211_csa_connection_drop_work);
3978         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3979         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3980                           ieee80211_tdls_peer_del_work);
3981         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3982                     (unsigned long) sdata);
3983         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3984                     (unsigned long) sdata);
3985         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3986                     (unsigned long) sdata);
3987         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3988                     (unsigned long) sdata);
3989         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
3990                           ieee80211_sta_handle_tspec_ac_params_wk);
3991
3992         ifmgd->flags = 0;
3993         ifmgd->powersave = sdata->wdev.ps;
3994         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3995         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3996         ifmgd->p2p_noa_index = -1;
3997
3998         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
3999                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4000         else
4001                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4002 }
4003
4004 /* scan finished notification */
4005 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4006 {
4007         struct ieee80211_sub_if_data *sdata;
4008
4009         /* Restart STA timers */
4010         rcu_read_lock();
4011         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4012                 if (ieee80211_sdata_running(sdata))
4013                         ieee80211_restart_sta_timer(sdata);
4014         }
4015         rcu_read_unlock();
4016 }
4017
4018 int ieee80211_max_network_latency(struct notifier_block *nb,
4019                                   unsigned long data, void *dummy)
4020 {
4021         s32 latency_usec = (s32) data;
4022         struct ieee80211_local *local =
4023                 container_of(nb, struct ieee80211_local,
4024                              network_latency_notifier);
4025
4026         mutex_lock(&local->iflist_mtx);
4027         ieee80211_recalc_ps(local, latency_usec);
4028         mutex_unlock(&local->iflist_mtx);
4029
4030         return NOTIFY_OK;
4031 }
4032
4033 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4034                                      struct cfg80211_bss *cbss)
4035 {
4036         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4037         const u8 *ht_cap_ie, *vht_cap_ie;
4038         const struct ieee80211_ht_cap *ht_cap;
4039         const struct ieee80211_vht_cap *vht_cap;
4040         u8 chains = 1;
4041
4042         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4043                 return chains;
4044
4045         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4046         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4047                 ht_cap = (void *)(ht_cap_ie + 2);
4048                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4049                 /*
4050                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4051                  *       "Tx Unequal Modulation Supported" fields.
4052                  */
4053         }
4054
4055         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4056                 return chains;
4057
4058         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4059         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4060                 u8 nss;
4061                 u16 tx_mcs_map;
4062
4063                 vht_cap = (void *)(vht_cap_ie + 2);
4064                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4065                 for (nss = 8; nss > 0; nss--) {
4066                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4067                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4068                                 break;
4069                 }
4070                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4071                 chains = max(chains, nss);
4072         }
4073
4074         return chains;
4075 }
4076
4077 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4078                                   struct cfg80211_bss *cbss)
4079 {
4080         struct ieee80211_local *local = sdata->local;
4081         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4082         const struct ieee80211_ht_cap *ht_cap = NULL;
4083         const struct ieee80211_ht_operation *ht_oper = NULL;
4084         const struct ieee80211_vht_operation *vht_oper = NULL;
4085         struct ieee80211_supported_band *sband;
4086         struct cfg80211_chan_def chandef;
4087         int ret;
4088
4089         sband = local->hw.wiphy->bands[cbss->channel->band];
4090
4091         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4092                           IEEE80211_STA_DISABLE_80P80MHZ |
4093                           IEEE80211_STA_DISABLE_160MHZ);
4094
4095         rcu_read_lock();
4096
4097         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4098             sband->ht_cap.ht_supported) {
4099                 const u8 *ht_oper_ie, *ht_cap_ie;
4100
4101                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4102                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4103                         ht_oper = (void *)(ht_oper_ie + 2);
4104
4105                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4106                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4107                         ht_cap = (void *)(ht_cap_ie + 2);
4108
4109                 if (!ht_cap) {
4110                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4111                         ht_oper = NULL;
4112                 }
4113         }
4114
4115         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4116             sband->vht_cap.vht_supported) {
4117                 const u8 *vht_oper_ie, *vht_cap;
4118
4119                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4120                                                    WLAN_EID_VHT_OPERATION);
4121                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4122                         vht_oper = (void *)(vht_oper_ie + 2);
4123                 if (vht_oper && !ht_oper) {
4124                         vht_oper = NULL;
4125                         sdata_info(sdata,
4126                                    "AP advertised VHT without HT, disabling both\n");
4127                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4128                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4129                 }
4130
4131                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4132                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4133                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4134                         vht_oper = NULL;
4135                 }
4136         }
4137
4138         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4139                                                      cbss->channel,
4140                                                      ht_cap, ht_oper, vht_oper,
4141                                                      &chandef, false);
4142
4143         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4144                                       local->rx_chains);
4145
4146         rcu_read_unlock();
4147
4148         /* will change later if needed */
4149         sdata->smps_mode = IEEE80211_SMPS_OFF;
4150
4151         mutex_lock(&local->mtx);
4152         /*
4153          * If this fails (possibly due to channel context sharing
4154          * on incompatible channels, e.g. 80+80 and 160 sharing the
4155          * same control channel) try to use a smaller bandwidth.
4156          */
4157         ret = ieee80211_vif_use_channel(sdata, &chandef,
4158                                         IEEE80211_CHANCTX_SHARED);
4159
4160         /* don't downgrade for 5 and 10 MHz channels, though. */
4161         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4162             chandef.width == NL80211_CHAN_WIDTH_10)
4163                 goto out;
4164
4165         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4166                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4167                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4168                                                 IEEE80211_CHANCTX_SHARED);
4169         }
4170  out:
4171         mutex_unlock(&local->mtx);
4172         return ret;
4173 }
4174
4175 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4176                                      struct cfg80211_bss *cbss, bool assoc)
4177 {
4178         struct ieee80211_local *local = sdata->local;
4179         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4180         struct ieee80211_bss *bss = (void *)cbss->priv;
4181         struct sta_info *new_sta = NULL;
4182         bool have_sta = false;
4183         int err;
4184
4185         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4186                 return -EINVAL;
4187
4188         if (assoc) {
4189                 rcu_read_lock();
4190                 have_sta = sta_info_get(sdata, cbss->bssid);
4191                 rcu_read_unlock();
4192         }
4193
4194         if (!have_sta) {
4195                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4196                 if (!new_sta)
4197                         return -ENOMEM;
4198         }
4199         if (new_sta) {
4200                 u32 rates = 0, basic_rates = 0;
4201                 bool have_higher_than_11mbit;
4202                 int min_rate = INT_MAX, min_rate_index = -1;
4203                 struct ieee80211_chanctx_conf *chanctx_conf;
4204                 struct ieee80211_supported_band *sband;
4205                 const struct cfg80211_bss_ies *ies;
4206                 int shift;
4207                 u32 rate_flags;
4208
4209                 sband = local->hw.wiphy->bands[cbss->channel->band];
4210
4211                 err = ieee80211_prep_channel(sdata, cbss);
4212                 if (err) {
4213                         sta_info_free(local, new_sta);
4214                         return -EINVAL;
4215                 }
4216                 shift = ieee80211_vif_get_shift(&sdata->vif);
4217
4218                 rcu_read_lock();
4219                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4220                 if (WARN_ON(!chanctx_conf)) {
4221                         rcu_read_unlock();
4222                         sta_info_free(local, new_sta);
4223                         return -EINVAL;
4224                 }
4225                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4226                 rcu_read_unlock();
4227
4228                 ieee80211_get_rates(sband, bss->supp_rates,
4229                                     bss->supp_rates_len,
4230                                     &rates, &basic_rates,
4231                                     &have_higher_than_11mbit,
4232                                     &min_rate, &min_rate_index,
4233                                     shift, rate_flags);
4234
4235                 /*
4236                  * This used to be a workaround for basic rates missing
4237                  * in the association response frame. Now that we no
4238                  * longer use the basic rates from there, it probably
4239                  * doesn't happen any more, but keep the workaround so
4240                  * in case some *other* APs are buggy in different ways
4241                  * we can connect -- with a warning.
4242                  */
4243                 if (!basic_rates && min_rate_index >= 0) {
4244                         sdata_info(sdata,
4245                                    "No basic rates, using min rate instead\n");
4246                         basic_rates = BIT(min_rate_index);
4247                 }
4248
4249                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4250                 sdata->vif.bss_conf.basic_rates = basic_rates;
4251
4252                 /* cf. IEEE 802.11 9.2.12 */
4253                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4254                     have_higher_than_11mbit)
4255                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4256                 else
4257                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4258
4259                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4260
4261                 /* set timing information */
4262                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4263                 rcu_read_lock();
4264                 ies = rcu_dereference(cbss->beacon_ies);
4265                 if (ies) {
4266                         const u8 *tim_ie;
4267
4268                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4269                         sdata->vif.bss_conf.sync_device_ts =
4270                                 bss->device_ts_beacon;
4271                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4272                                                   ies->data, ies->len);
4273                         if (tim_ie && tim_ie[1] >= 2)
4274                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4275                         else
4276                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4277                 } else if (!(local->hw.flags &
4278                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4279                         ies = rcu_dereference(cbss->proberesp_ies);
4280                         /* must be non-NULL since beacon IEs were NULL */
4281                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4282                         sdata->vif.bss_conf.sync_device_ts =
4283                                 bss->device_ts_presp;
4284                         sdata->vif.bss_conf.sync_dtim_count = 0;
4285                 } else {
4286                         sdata->vif.bss_conf.sync_tsf = 0;
4287                         sdata->vif.bss_conf.sync_device_ts = 0;
4288                         sdata->vif.bss_conf.sync_dtim_count = 0;
4289                 }
4290                 rcu_read_unlock();
4291
4292                 /* tell driver about BSSID, basic rates and timing */
4293                 ieee80211_bss_info_change_notify(sdata,
4294                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4295                         BSS_CHANGED_BEACON_INT);
4296
4297                 if (assoc)
4298                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4299
4300                 err = sta_info_insert(new_sta);
4301                 new_sta = NULL;
4302                 if (err) {
4303                         sdata_info(sdata,
4304                                    "failed to insert STA entry for the AP (error %d)\n",
4305                                    err);
4306                         return err;
4307                 }
4308         } else
4309                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4310
4311         return 0;
4312 }
4313
4314 /* config hooks */
4315 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4316                        struct cfg80211_auth_request *req)
4317 {
4318         struct ieee80211_local *local = sdata->local;
4319         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4320         struct ieee80211_mgd_auth_data *auth_data;
4321         u16 auth_alg;
4322         int err;
4323
4324         /* prepare auth data structure */
4325
4326         switch (req->auth_type) {
4327         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4328                 auth_alg = WLAN_AUTH_OPEN;
4329                 break;
4330         case NL80211_AUTHTYPE_SHARED_KEY:
4331                 if (IS_ERR(local->wep_tx_tfm))
4332                         return -EOPNOTSUPP;
4333                 auth_alg = WLAN_AUTH_SHARED_KEY;
4334                 break;
4335         case NL80211_AUTHTYPE_FT:
4336                 auth_alg = WLAN_AUTH_FT;
4337                 break;
4338         case NL80211_AUTHTYPE_NETWORK_EAP:
4339                 auth_alg = WLAN_AUTH_LEAP;
4340                 break;
4341         case NL80211_AUTHTYPE_SAE:
4342                 auth_alg = WLAN_AUTH_SAE;
4343                 break;
4344         default:
4345                 return -EOPNOTSUPP;
4346         }
4347
4348         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4349                             req->ie_len, GFP_KERNEL);
4350         if (!auth_data)
4351                 return -ENOMEM;
4352
4353         auth_data->bss = req->bss;
4354
4355         if (req->sae_data_len >= 4) {
4356                 __le16 *pos = (__le16 *) req->sae_data;
4357                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4358                 auth_data->sae_status = le16_to_cpu(pos[1]);
4359                 memcpy(auth_data->data, req->sae_data + 4,
4360                        req->sae_data_len - 4);
4361                 auth_data->data_len += req->sae_data_len - 4;
4362         }
4363
4364         if (req->ie && req->ie_len) {
4365                 memcpy(&auth_data->data[auth_data->data_len],
4366                        req->ie, req->ie_len);
4367                 auth_data->data_len += req->ie_len;
4368         }
4369
4370         if (req->key && req->key_len) {
4371                 auth_data->key_len = req->key_len;
4372                 auth_data->key_idx = req->key_idx;
4373                 memcpy(auth_data->key, req->key, req->key_len);
4374         }
4375
4376         auth_data->algorithm = auth_alg;
4377
4378         /* try to authenticate/probe */
4379
4380         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4381             ifmgd->assoc_data) {
4382                 err = -EBUSY;
4383                 goto err_free;
4384         }
4385
4386         if (ifmgd->auth_data)
4387                 ieee80211_destroy_auth_data(sdata, false);
4388
4389         /* prep auth_data so we don't go into idle on disassoc */
4390         ifmgd->auth_data = auth_data;
4391
4392         if (ifmgd->associated) {
4393                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4394
4395                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4396                                        WLAN_REASON_UNSPECIFIED,
4397                                        false, frame_buf);
4398
4399                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4400                                       sizeof(frame_buf));
4401         }
4402
4403         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4404
4405         err = ieee80211_prep_connection(sdata, req->bss, false);
4406         if (err)
4407                 goto err_clear;
4408
4409         err = ieee80211_probe_auth(sdata);
4410         if (err) {
4411                 sta_info_destroy_addr(sdata, req->bss->bssid);
4412                 goto err_clear;
4413         }
4414
4415         /* hold our own reference */
4416         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4417         return 0;
4418
4419  err_clear:
4420         memset(ifmgd->bssid, 0, ETH_ALEN);
4421         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4422         ifmgd->auth_data = NULL;
4423  err_free:
4424         kfree(auth_data);
4425         return err;
4426 }
4427
4428 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4429                                         const u8 *wmm_param, int len)
4430 {
4431         const u8 *pos;
4432         size_t left;
4433
4434         if (len < 8)
4435                 return false;
4436
4437         if (wmm_param[5] != 1 /* version */)
4438                 return false;
4439
4440         pos = wmm_param + 8;
4441         left = len - 8;
4442
4443         for (; left >= 4; left -= 4, pos += 4) {
4444                 u8 aifsn = pos[0] & 0x0f;
4445                 u8 ecwmin = pos[1] & 0x0f;
4446                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4447                 int aci = (pos[0] >> 5) & 0x03;
4448
4449                 if (aifsn < 2) {
4450                         sdata_info(sdata,
4451                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4452                                    aifsn, aci);
4453                         return false;
4454                 }
4455                 if (ecwmin > ecwmax) {
4456                         sdata_info(sdata,
4457                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4458                                    ecwmin, ecwmax, aci);
4459                         return false;
4460                 }
4461         }
4462
4463         return true;
4464 }
4465
4466 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4467                         struct cfg80211_assoc_request *req)
4468 {
4469         struct ieee80211_local *local = sdata->local;
4470         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4471         struct ieee80211_bss *bss = (void *)req->bss->priv;
4472         struct ieee80211_mgd_assoc_data *assoc_data;
4473         const struct cfg80211_bss_ies *beacon_ies;
4474         struct ieee80211_supported_band *sband;
4475         const u8 *ssidie, *ht_ie, *vht_ie;
4476         int i, err;
4477
4478         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4479         if (!assoc_data)
4480                 return -ENOMEM;
4481
4482         rcu_read_lock();
4483         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4484         if (!ssidie) {
4485                 rcu_read_unlock();
4486                 kfree(assoc_data);
4487                 return -EINVAL;
4488         }
4489         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4490         assoc_data->ssid_len = ssidie[1];
4491         rcu_read_unlock();
4492
4493         if (ifmgd->associated) {
4494                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4495
4496                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4497                                        WLAN_REASON_UNSPECIFIED,
4498                                        false, frame_buf);
4499
4500                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4501                                       sizeof(frame_buf));
4502         }
4503
4504         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4505                 err = -EBUSY;
4506                 goto err_free;
4507         }
4508
4509         if (ifmgd->assoc_data) {
4510                 err = -EBUSY;
4511                 goto err_free;
4512         }
4513
4514         if (ifmgd->auth_data) {
4515                 bool match;
4516
4517                 /* keep sta info, bssid if matching */
4518                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4519                 ieee80211_destroy_auth_data(sdata, match);
4520         }
4521
4522         /* prepare assoc data */
4523
4524         ifmgd->beacon_crc_valid = false;
4525
4526         assoc_data->wmm = bss->wmm_used &&
4527                           (local->hw.queues >= IEEE80211_NUM_ACS);
4528         if (assoc_data->wmm) {
4529                 /* try to check validity of WMM params IE */
4530                 const struct cfg80211_bss_ies *ies;
4531                 const u8 *wp, *start, *end;
4532
4533                 rcu_read_lock();
4534                 ies = rcu_dereference(req->bss->ies);
4535                 start = ies->data;
4536                 end = start + ies->len;
4537
4538                 while (true) {
4539                         wp = cfg80211_find_vendor_ie(
4540                                 WLAN_OUI_MICROSOFT,
4541                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4542                                 start, end - start);
4543                         if (!wp)
4544                                 break;
4545                         start = wp + wp[1] + 2;
4546                         /* if this IE is too short, try the next */
4547                         if (wp[1] <= 4)
4548                                 continue;
4549                         /* if this IE is WMM params, we found what we wanted */
4550                         if (wp[6] == 1)
4551                                 break;
4552                 }
4553
4554                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4555                                                         wp[1] - 2)) {
4556                         assoc_data->wmm = false;
4557                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4558                 }
4559                 rcu_read_unlock();
4560         }
4561
4562         /*
4563          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4564          * We still associate in non-HT mode (11a/b/g) if any one of these
4565          * ciphers is configured as pairwise.
4566          * We can set this to true for non-11n hardware, that'll be checked
4567          * separately along with the peer capabilities.
4568          */
4569         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4570                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4571                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4572                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4573                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4574                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4575                         netdev_info(sdata->dev,
4576                                     "disabling HT/VHT due to WEP/TKIP use\n");
4577                 }
4578         }
4579
4580         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4581                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4582                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4583         }
4584
4585         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4586                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4587
4588         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4589         sband = local->hw.wiphy->bands[req->bss->channel->band];
4590         if (!sband->ht_cap.ht_supported ||
4591             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4592             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4593                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4594                 if (!bss->wmm_used &&
4595                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4596                         netdev_info(sdata->dev,
4597                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4598         }
4599
4600         /* disable VHT if we don't support it or the AP doesn't use WMM */
4601         if (!sband->vht_cap.vht_supported ||
4602             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4603             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4604                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4605                 if (!bss->wmm_used &&
4606                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4607                         netdev_info(sdata->dev,
4608                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4609         }
4610
4611         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4612         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4613                sizeof(ifmgd->ht_capa_mask));
4614
4615         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4616         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4617                sizeof(ifmgd->vht_capa_mask));
4618
4619         if (req->ie && req->ie_len) {
4620                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4621                 assoc_data->ie_len = req->ie_len;
4622         }
4623
4624         assoc_data->bss = req->bss;
4625
4626         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4627                 if (ifmgd->powersave)
4628                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4629                 else
4630                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4631         } else
4632                 sdata->smps_mode = ifmgd->req_smps;
4633
4634         assoc_data->capability = req->bss->capability;
4635         assoc_data->supp_rates = bss->supp_rates;
4636         assoc_data->supp_rates_len = bss->supp_rates_len;
4637
4638         rcu_read_lock();
4639         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4640         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4641                 assoc_data->ap_ht_param =
4642                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4643         else
4644                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4645         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4646         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4647                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4648                        sizeof(struct ieee80211_vht_cap));
4649         else
4650                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4651         rcu_read_unlock();
4652
4653         if (bss->wmm_used && bss->uapsd_supported &&
4654             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4655                 assoc_data->uapsd = true;
4656                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4657         } else {
4658                 assoc_data->uapsd = false;
4659                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4660         }
4661
4662         if (req->prev_bssid)
4663                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4664
4665         if (req->use_mfp) {
4666                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4667                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4668         } else {
4669                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4670                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4671         }
4672
4673         if (req->flags & ASSOC_REQ_USE_RRM)
4674                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4675         else
4676                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4677
4678         if (req->crypto.control_port)
4679                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4680         else
4681                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4682
4683         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4684         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4685         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4686                                                         sdata->vif.type);
4687
4688         /* kick off associate process */
4689
4690         ifmgd->assoc_data = assoc_data;
4691         ifmgd->dtim_period = 0;
4692         ifmgd->have_beacon = false;
4693
4694         err = ieee80211_prep_connection(sdata, req->bss, true);
4695         if (err)
4696                 goto err_clear;
4697
4698         rcu_read_lock();
4699         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4700
4701         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4702             !beacon_ies) {
4703                 /*
4704                  * Wait up to one beacon interval ...
4705                  * should this be more if we miss one?
4706                  */
4707                 sdata_info(sdata, "waiting for beacon from %pM\n",
4708                            ifmgd->bssid);
4709                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4710                 assoc_data->timeout_started = true;
4711                 assoc_data->need_beacon = true;
4712         } else if (beacon_ies) {
4713                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4714                                                     beacon_ies->data,
4715                                                     beacon_ies->len);
4716                 u8 dtim_count = 0;
4717
4718                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4719                         const struct ieee80211_tim_ie *tim;
4720                         tim = (void *)(tim_ie + 2);
4721                         ifmgd->dtim_period = tim->dtim_period;
4722                         dtim_count = tim->dtim_count;
4723                 }
4724                 ifmgd->have_beacon = true;
4725                 assoc_data->timeout = jiffies;
4726                 assoc_data->timeout_started = true;
4727
4728                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4729                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4730                         sdata->vif.bss_conf.sync_device_ts =
4731                                 bss->device_ts_beacon;
4732                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4733                 }
4734         } else {
4735                 assoc_data->timeout = jiffies;
4736                 assoc_data->timeout_started = true;
4737         }
4738         rcu_read_unlock();
4739
4740         run_again(sdata, assoc_data->timeout);
4741
4742         if (bss->corrupt_data) {
4743                 char *corrupt_type = "data";
4744                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4745                         if (bss->corrupt_data &
4746                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4747                                 corrupt_type = "beacon and probe response";
4748                         else
4749                                 corrupt_type = "beacon";
4750                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4751                         corrupt_type = "probe response";
4752                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4753                            corrupt_type);
4754         }
4755
4756         return 0;
4757  err_clear:
4758         memset(ifmgd->bssid, 0, ETH_ALEN);
4759         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4760         ifmgd->assoc_data = NULL;
4761  err_free:
4762         kfree(assoc_data);
4763         return err;
4764 }
4765
4766 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4767                          struct cfg80211_deauth_request *req)
4768 {
4769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4770         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4771         bool tx = !req->local_state_change;
4772
4773         if (ifmgd->auth_data &&
4774             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4775                 sdata_info(sdata,
4776                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4777                            req->bssid, req->reason_code,
4778                            ieee80211_get_reason_code_string(req->reason_code));
4779
4780                 drv_mgd_prepare_tx(sdata->local, sdata);
4781                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4782                                                IEEE80211_STYPE_DEAUTH,
4783                                                req->reason_code, tx,
4784                                                frame_buf);
4785                 ieee80211_destroy_auth_data(sdata, false);
4786                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4787                                       IEEE80211_DEAUTH_FRAME_LEN);
4788
4789                 return 0;
4790         }
4791
4792         if (ifmgd->associated &&
4793             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4794                 sdata_info(sdata,
4795                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4796                            req->bssid, req->reason_code,
4797                            ieee80211_get_reason_code_string(req->reason_code));
4798
4799                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4800                                        req->reason_code, tx, frame_buf);
4801                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4802                                       IEEE80211_DEAUTH_FRAME_LEN);
4803                 return 0;
4804         }
4805
4806         return -ENOTCONN;
4807 }
4808
4809 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4810                            struct cfg80211_disassoc_request *req)
4811 {
4812         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4813         u8 bssid[ETH_ALEN];
4814         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4815
4816         /*
4817          * cfg80211 should catch this ... but it's racy since
4818          * we can receive a disassoc frame, process it, hand it
4819          * to cfg80211 while that's in a locked section already
4820          * trying to tell us that the user wants to disconnect.
4821          */
4822         if (ifmgd->associated != req->bss)
4823                 return -ENOLINK;
4824
4825         sdata_info(sdata,
4826                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4827                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4828
4829         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4830         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4831                                req->reason_code, !req->local_state_change,
4832                                frame_buf);
4833
4834         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4835                               IEEE80211_DEAUTH_FRAME_LEN);
4836
4837         return 0;
4838 }
4839
4840 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4841 {
4842         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4843
4844         /*
4845          * Make sure some work items will not run after this,
4846          * they will not do anything but might not have been
4847          * cancelled when disconnecting.
4848          */
4849         cancel_work_sync(&ifmgd->monitor_work);
4850         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4851         cancel_work_sync(&ifmgd->request_smps_work);
4852         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4853         cancel_work_sync(&ifmgd->chswitch_work);
4854         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4855
4856         sdata_lock(sdata);
4857         if (ifmgd->assoc_data) {
4858                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4859                 ieee80211_destroy_assoc_data(sdata, false);
4860                 cfg80211_assoc_timeout(sdata->dev, bss);
4861         }
4862         if (ifmgd->auth_data)
4863                 ieee80211_destroy_auth_data(sdata, false);
4864         del_timer_sync(&ifmgd->timer);
4865         sdata_unlock(sdata);
4866 }
4867
4868 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4869                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4870                                gfp_t gfp)
4871 {
4872         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4873
4874         trace_api_cqm_rssi_notify(sdata, rssi_event);
4875
4876         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4877 }
4878 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);