net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  34 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  35 #define IEEE80211_AUTH_MAX_TRIES        3
  36 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  37 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  38 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  39 #define IEEE80211_ASSOC_MAX_TRIES       3
  40
  41 static int max_nullfunc_tries = 2;
  42 module_param(max_nullfunc_tries, int, 0644);
  43 MODULE_PARM_DESC(max_nullfunc_tries,
  44                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  45
  46 static int max_probe_tries = 5;
  47 module_param(max_probe_tries, int, 0644);
  48 MODULE_PARM_DESC(max_probe_tries,
  49                  "Maximum probe tries before disconnecting (reason 4).");
  50
  51 /*
  52  * Beacon loss timeout is calculated as N frames times the
  53  * advertised beacon interval.  This may need to be somewhat
  54  * higher than what hardware might detect to account for
  55  * delays in the host processing frames. But since we also
  56  * probe on beacon miss before declaring the connection lost
  57  * default to what we want.
  58  */
  59 static int beacon_loss_count = 7;
  60 module_param(beacon_loss_count, int, 0644);
  61 MODULE_PARM_DESC(beacon_loss_count,
  62                  "Number of beacon intervals before we decide beacon was lost.");
  63
  64 /*
  65  * Time the connection can be idle before we probe
  66  * it to see if we can still talk to the AP.
  67  */
  68 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  69 /*
  70  * Time we wait for a probe response after sending
  71  * a probe request because of beacon loss or for
  72  * checking the connection still works.
  73  */
  74 static int probe_wait_ms = 500;
  75 module_param(probe_wait_ms, int, 0644);
  76 MODULE_PARM_DESC(probe_wait_ms,
  77                  "Maximum time(ms) to wait for probe response"
  78                  " before disconnecting (reason 4).");
  79
  80 /*
  81  * Weight given to the latest Beacon frame when calculating average signal
  82  * strength for Beacon frames received in the current BSS. This must be
  83  * between 1 and 15.
  84  */
  85 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  86
  87 /*
  88  * How many Beacon frames need to have been used in average signal strength
  89  * before starting to indicate signal change events.
  90  */
  91 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117
 118         /* used when a processed beacon causes a deauth */
 119         RX_MGMT_CFG80211_TX_DEAUTH,
 120 };
 121
 122 /* utils */
 123 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 124 {
 125         lockdep_assert_held(&ifmgd->mtx);
 126 }
 127
 128 /*
 129  * We can have multiple work items (and connection probing)
 130  * scheduling this timer, but we need to take care to only
 131  * reschedule it when it should fire _earlier_ than it was
 132  * asked for before, or if it's not pending right now. This
 133  * function ensures that. Note that it then is required to
 134  * run this function for all timeouts after the first one
 135  * has happened -- the work that runs from this timer will
 136  * do that.
 137  */
 138 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 139 {
 140         ASSERT_MGD_MTX(ifmgd);
 141
 142         if (!timer_pending(&ifmgd->timer) ||
 143             time_before(timeout, ifmgd->timer.expires))
 144                 mod_timer(&ifmgd->timer, timeout);
 145 }
 146
 147 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 148 {
 149         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 150                 return;
 151
 152         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 153                 return;
 154
 155         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 156                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 157 }
 158
 159 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 160 {
 161         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 162
 163         if (unlikely(!sdata->u.mgd.associated))
 164                 return;
 165
 166         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 167                 return;
 168
 169         mod_timer(&sdata->u.mgd.conn_mon_timer,
 170                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 171
 172         ifmgd->probe_send_count = 0;
 173 }
 174
 175 static int ecw2cw(int ecw)
 176 {
 177         return (1 << ecw) - 1;
 178 }
 179
 180 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
 181 {
 182         u32 ret;
 183         int tmp;
 184
 185         switch (c->width) {
 186         case NL80211_CHAN_WIDTH_20:
 187                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
 188                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 189                 break;
 190         case NL80211_CHAN_WIDTH_40:
 191                 c->width = NL80211_CHAN_WIDTH_20;
 192                 c->center_freq1 = c->chan->center_freq;
 193                 ret = IEEE80211_STA_DISABLE_40MHZ |
 194                       IEEE80211_STA_DISABLE_VHT;
 195                 break;
 196         case NL80211_CHAN_WIDTH_80:
 197                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
 198                 /* n_P40 */
 199                 tmp /= 2;
 200                 /* freq_P40 */
 201                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
 202                 c->width = NL80211_CHAN_WIDTH_40;
 203                 ret = IEEE80211_STA_DISABLE_VHT;
 204                 break;
 205         case NL80211_CHAN_WIDTH_80P80:
 206                 c->center_freq2 = 0;
 207                 c->width = NL80211_CHAN_WIDTH_80;
 208                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
 209                       IEEE80211_STA_DISABLE_160MHZ;
 210                 break;
 211         case NL80211_CHAN_WIDTH_160:
 212                 /* n_P20 */
 213                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
 214                 /* n_P80 */
 215                 tmp /= 4;
 216                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
 217                 c->width = NL80211_CHAN_WIDTH_80;
 218                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
 219                       IEEE80211_STA_DISABLE_160MHZ;
 220                 break;
 221         default:
 222         case NL80211_CHAN_WIDTH_20_NOHT:
 223                 WARN_ON_ONCE(1);
 224                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
 225                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 226                 break;
 227         }
 228
 229         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
 230
 231         return ret;
 232 }
 233
 234 static u32
 235 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 236                              struct ieee80211_supported_band *sband,
 237                              struct ieee80211_channel *channel,
 238                              const struct ieee80211_ht_operation *ht_oper,
 239                              const struct ieee80211_vht_operation *vht_oper,
 240                              struct cfg80211_chan_def *chandef, bool verbose)
 241 {
 242         struct cfg80211_chan_def vht_chandef;
 243         u32 ht_cfreq, ret;
 244
 245         chandef->chan = channel;
 246         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 247         chandef->center_freq1 = channel->center_freq;
 248         chandef->center_freq2 = 0;
 249
 250         if (!ht_oper || !sband->ht_cap.ht_supported) {
 251                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         chandef->width = NL80211_CHAN_WIDTH_20;
 256
 257         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 258                                                   channel->band);
 259         /* check that channel matches the right operating channel */
 260         if (channel->center_freq != ht_cfreq) {
 261                 /*
 262                  * It's possible that some APs are confused here;
 263                  * Netgear WNDR3700 sometimes reports 4 higher than
 264                  * the actual channel in association responses, but
 265                  * since we look at probe response/beacon data here
 266                  * it should be OK.
 267                  */
 268                 if (verbose)
 269                         sdata_info(sdata,
 270                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 271                                    channel->center_freq, ht_cfreq,
 272                                    ht_oper->primary_chan, channel->band);
 273                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 274                 goto out;
 275         }
 276
 277         /* check 40 MHz support, if we have it */
 278         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 279                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 280                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 281                         chandef->width = NL80211_CHAN_WIDTH_40;
 282                         chandef->center_freq1 += 10;
 283                         break;
 284                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 285                         chandef->width = NL80211_CHAN_WIDTH_40;
 286                         chandef->center_freq1 -= 10;
 287                         break;
 288                 }
 289         } else {
 290                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 291                 ret = IEEE80211_STA_DISABLE_VHT;
 292                 /* also mark 40 MHz disabled */
 293                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 294                 goto out;
 295         }
 296
 297         if (!vht_oper || !sband->vht_cap.vht_supported) {
 298                 ret = IEEE80211_STA_DISABLE_VHT;
 299                 goto out;
 300         }
 301
 302         vht_chandef.chan = channel;
 303         vht_chandef.center_freq1 =
 304                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 305                                                channel->band);
 306         vht_chandef.center_freq2 = 0;
 307
 308         switch (vht_oper->chan_width) {
 309         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 310                 vht_chandef.width = chandef->width;
 311                 break;
 312         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 313                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 314                 break;
 315         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 316                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 317                 break;
 318         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 319                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 320                 vht_chandef.center_freq2 =
 321                         ieee80211_channel_to_frequency(
 322                                 vht_oper->center_freq_seg2_idx,
 323                                 channel->band);
 324                 break;
 325         default:
 326                 if (verbose)
 327                         sdata_info(sdata,
 328                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 329                                    vht_oper->chan_width);
 330                 ret = IEEE80211_STA_DISABLE_VHT;
 331                 goto out;
 332         }
 333
 334         if (!cfg80211_chandef_valid(&vht_chandef)) {
 335                 if (verbose)
 336                         sdata_info(sdata,
 337                                    "AP VHT information is invalid, disable VHT\n");
 338                 ret = IEEE80211_STA_DISABLE_VHT;
 339                 goto out;
 340         }
 341
 342         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 343                 ret = 0;
 344                 goto out;
 345         }
 346
 347         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 348                 if (verbose)
 349                         sdata_info(sdata,
 350                                    "AP VHT information doesn't match HT, disable VHT\n");
 351                 ret = IEEE80211_STA_DISABLE_VHT;
 352                 goto out;
 353         }
 354
 355         *chandef = vht_chandef;
 356
 357         ret = 0;
 358
 359 out:
 360         /* don't print the message below for VHT mismatch if VHT is disabled */
 361         if (ret & IEEE80211_STA_DISABLE_VHT)
 362                 vht_chandef = *chandef;
 363
 364         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 365                                         IEEE80211_CHAN_DISABLED)) {
 366                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 367                         ret = IEEE80211_STA_DISABLE_HT |
 368                               IEEE80211_STA_DISABLE_VHT;
 369                         goto out;
 370                 }
 371
 372                 ret |= chandef_downgrade(chandef);
 373         }
 374
 375         if (chandef->width != vht_chandef.width && verbose)
 376                 sdata_info(sdata,
 377                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 378
 379         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 380         return ret;
 381 }
 382
 383 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 384                                struct sta_info *sta,
 385                                const struct ieee80211_ht_operation *ht_oper,
 386                                const struct ieee80211_vht_operation *vht_oper,
 387                                const u8 *bssid, u32 *changed)
 388 {
 389         struct ieee80211_local *local = sdata->local;
 390         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 391         struct ieee80211_supported_band *sband;
 392         struct ieee80211_channel *chan;
 393         struct cfg80211_chan_def chandef;
 394         u16 ht_opmode;
 395         u32 flags;
 396         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 397         int ret;
 398
 399         /* if HT was/is disabled, don't track any bandwidth changes */
 400         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 401                 return 0;
 402
 403         /* don't check VHT if we associated as non-VHT station */
 404         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 405                 vht_oper = NULL;
 406
 407         if (WARN_ON_ONCE(!sta))
 408                 return -EINVAL;
 409
 410         chan = sdata->vif.bss_conf.chandef.chan;
 411         sband = local->hw.wiphy->bands[chan->band];
 412
 413         /* calculate new channel (type) based on HT/VHT operation IEs */
 414         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
 415                                              vht_oper, &chandef, false);
 416
 417         /*
 418          * Downgrade the new channel if we associated with restricted
 419          * capabilities. For example, if we associated as a 20 MHz STA
 420          * to a 40 MHz AP (due to regulatory, capabilities or config
 421          * reasons) then switching to a 40 MHz channel now won't do us
 422          * any good -- we couldn't use it with the AP.
 423          */
 424         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 425             chandef.width == NL80211_CHAN_WIDTH_80P80)
 426                 flags |= chandef_downgrade(&chandef);
 427         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 428             chandef.width == NL80211_CHAN_WIDTH_160)
 429                 flags |= chandef_downgrade(&chandef);
 430         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 431             chandef.width > NL80211_CHAN_WIDTH_20)
 432                 flags |= chandef_downgrade(&chandef);
 433
 434         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 435                 return 0;
 436
 437         sdata_info(sdata,
 438                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 439                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 440                    chandef.center_freq1, chandef.center_freq2);
 441
 442         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 443                                       IEEE80211_STA_DISABLE_VHT |
 444                                       IEEE80211_STA_DISABLE_40MHZ |
 445                                       IEEE80211_STA_DISABLE_80P80MHZ |
 446                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 447             !cfg80211_chandef_valid(&chandef)) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 450                            ifmgd->bssid);
 451                 return -EINVAL;
 452         }
 453
 454         switch (chandef.width) {
 455         case NL80211_CHAN_WIDTH_20_NOHT:
 456         case NL80211_CHAN_WIDTH_20:
 457                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 458                 break;
 459         case NL80211_CHAN_WIDTH_40:
 460                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 461                 break;
 462         case NL80211_CHAN_WIDTH_80:
 463                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 464                 break;
 465         case NL80211_CHAN_WIDTH_80P80:
 466         case NL80211_CHAN_WIDTH_160:
 467                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 468                 break;
 469         default:
 470                 return -EINVAL;
 471         }
 472
 473         if (new_sta_bw > sta->cur_max_bandwidth)
 474                 new_sta_bw = sta->cur_max_bandwidth;
 475
 476         if (new_sta_bw < sta->sta.bandwidth) {
 477                 sta->sta.bandwidth = new_sta_bw;
 478                 rate_control_rate_update(local, sband, sta,
 479                                          IEEE80211_RC_BW_CHANGED);
 480         }
 481
 482         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 483         if (ret) {
 484                 sdata_info(sdata,
 485                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 486                            ifmgd->bssid);
 487                 return ret;
 488         }
 489
 490         if (new_sta_bw > sta->sta.bandwidth) {
 491                 sta->sta.bandwidth = new_sta_bw;
 492                 rate_control_rate_update(local, sband, sta,
 493                                          IEEE80211_RC_BW_CHANGED);
 494         }
 495
 496         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 497
 498         /* if bss configuration changed store the new one */
 499         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 500                 *changed |= BSS_CHANGED_HT;
 501                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 502         }
 503
 504         return 0;
 505 }
 506
 507 /* frame sending functions */
 508
 509 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 510                                       struct ieee80211_supported_band *sband,
 511                                       u32 *rates)
 512 {
 513         int i, j, count;
 514         *rates = 0;
 515         count = 0;
 516         for (i = 0; i < supp_rates_len; i++) {
 517                 int rate = (supp_rates[i] & 0x7F) * 5;
 518
 519                 for (j = 0; j < sband->n_bitrates; j++)
 520                         if (sband->bitrates[j].bitrate == rate) {
 521                                 *rates |= BIT(j);
 522                                 count++;
 523                                 break;
 524                         }
 525         }
 526
 527         return count;
 528 }
 529
 530 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 531                                 struct sk_buff *skb, u8 ap_ht_param,
 532                                 struct ieee80211_supported_band *sband,
 533                                 struct ieee80211_channel *channel,
 534                                 enum ieee80211_smps_mode smps)
 535 {
 536         u8 *pos;
 537         u32 flags = channel->flags;
 538         u16 cap;
 539         struct ieee80211_sta_ht_cap ht_cap;
 540
 541         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 542
 543         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 544         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 545
 546         /* determine capability flags */
 547         cap = ht_cap.cap;
 548
 549         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 550         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 551                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 552                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 553                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 554                 }
 555                 break;
 556         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 557                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 558                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 559                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 560                 }
 561                 break;
 562         }
 563
 564         /*
 565          * If 40 MHz was disabled associate as though we weren't
 566          * capable of 40 MHz -- some broken APs will never fall
 567          * back to trying to transmit in 20 MHz.
 568          */
 569         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 570                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 571                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 572         }
 573
 574         /* set SM PS mode properly */
 575         cap &= ~IEEE80211_HT_CAP_SM_PS;
 576         switch (smps) {
 577         case IEEE80211_SMPS_AUTOMATIC:
 578         case IEEE80211_SMPS_NUM_MODES:
 579                 WARN_ON(1);
 580         case IEEE80211_SMPS_OFF:
 581                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 582                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 583                 break;
 584         case IEEE80211_SMPS_STATIC:
 585                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 586                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 587                 break;
 588         case IEEE80211_SMPS_DYNAMIC:
 589                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 590                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 591                 break;
 592         }
 593
 594         /* reserve and fill IE */
 595         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 596         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 597 }
 598
 599 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 600                                  struct sk_buff *skb,
 601                                  struct ieee80211_supported_band *sband,
 602                                  struct ieee80211_vht_cap *ap_vht_cap)
 603 {
 604         u8 *pos;
 605         u32 cap;
 606         struct ieee80211_sta_vht_cap vht_cap;
 607
 608         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 609
 610         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 611         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 612
 613         /* determine capability flags */
 614         cap = vht_cap.cap;
 615
 616         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 617                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 618                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 619         }
 620
 621         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 622                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 623                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 624         }
 625
 626         /*
 627          * Some APs apparently get confused if our capabilities are better
 628          * than theirs, so restrict what we advertise in the assoc request.
 629          */
 630         if (!(ap_vht_cap->vht_cap_info &
 631                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 632                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 633
 634         /* reserve and fill IE */
 635         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 636         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 637 }
 638
 639 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 640 {
 641         struct ieee80211_local *local = sdata->local;
 642         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 643         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 644         struct sk_buff *skb;
 645         struct ieee80211_mgmt *mgmt;
 646         u8 *pos, qos_info;
 647         size_t offset = 0, noffset;
 648         int i, count, rates_len, supp_rates_len;
 649         u16 capab;
 650         struct ieee80211_supported_band *sband;
 651         struct ieee80211_chanctx_conf *chanctx_conf;
 652         struct ieee80211_channel *chan;
 653         u32 rates = 0;
 654
 655         lockdep_assert_held(&ifmgd->mtx);
 656
 657         rcu_read_lock();
 658         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 659         if (WARN_ON(!chanctx_conf)) {
 660                 rcu_read_unlock();
 661                 return;
 662         }
 663         chan = chanctx_conf->def.chan;
 664         rcu_read_unlock();
 665         sband = local->hw.wiphy->bands[chan->band];
 666
 667         if (assoc_data->supp_rates_len) {
 668                 /*
 669                  * Get all rates supported by the device and the AP as
 670                  * some APs don't like getting a superset of their rates
 671                  * in the association request (e.g. D-Link DAP 1353 in
 672                  * b-only mode)...
 673                  */
 674                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 675                                                        assoc_data->supp_rates_len,
 676                                                        sband, &rates);
 677         } else {
 678                 /*
 679                  * In case AP not provide any supported rates information
 680                  * before association, we send information element(s) with
 681                  * all rates that we support.
 682                  */
 683                 rates = ~0;
 684                 rates_len = sband->n_bitrates;
 685         }
 686
 687         skb = alloc_skb(local->hw.extra_tx_headroom +
 688                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 689                         2 + assoc_data->ssid_len + /* SSID */
 690                         4 + rates_len + /* (extended) rates */
 691                         4 + /* power capability */
 692                         2 + 2 * sband->n_channels + /* supported channels */
 693                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 694                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 695                         assoc_data->ie_len + /* extra IEs */
 696                         9, /* WMM */
 697                         GFP_KERNEL);
 698         if (!skb)
 699                 return;
 700
 701         skb_reserve(skb, local->hw.extra_tx_headroom);
 702
 703         capab = WLAN_CAPABILITY_ESS;
 704
 705         if (sband->band == IEEE80211_BAND_2GHZ) {
 706                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 707                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 708                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 709                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 710         }
 711
 712         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 713                 capab |= WLAN_CAPABILITY_PRIVACY;
 714
 715         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 716             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 717                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 718
 719         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 720         memset(mgmt, 0, 24);
 721         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 722         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 723         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 724
 725         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 726                 skb_put(skb, 10);
 727                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 728                                                   IEEE80211_STYPE_REASSOC_REQ);
 729                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 730                 mgmt->u.reassoc_req.listen_interval =
 731                                 cpu_to_le16(local->hw.conf.listen_interval);
 732                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 733                        ETH_ALEN);
 734         } else {
 735                 skb_put(skb, 4);
 736                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 737                                                   IEEE80211_STYPE_ASSOC_REQ);
 738                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 739                 mgmt->u.assoc_req.listen_interval =
 740                                 cpu_to_le16(local->hw.conf.listen_interval);
 741         }
 742
 743         /* SSID */
 744         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 745         *pos++ = WLAN_EID_SSID;
 746         *pos++ = assoc_data->ssid_len;
 747         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 748
 749         /* add all rates which were marked to be used above */
 750         supp_rates_len = rates_len;
 751         if (supp_rates_len > 8)
 752                 supp_rates_len = 8;
 753
 754         pos = skb_put(skb, supp_rates_len + 2);
 755         *pos++ = WLAN_EID_SUPP_RATES;
 756         *pos++ = supp_rates_len;
 757
 758         count = 0;
 759         for (i = 0; i < sband->n_bitrates; i++) {
 760                 if (BIT(i) & rates) {
 761                         int rate = sband->bitrates[i].bitrate;
 762                         *pos++ = (u8) (rate / 5);
 763                         if (++count == 8)
 764                                 break;
 765                 }
 766         }
 767
 768         if (rates_len > count) {
 769                 pos = skb_put(skb, rates_len - count + 2);
 770                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 771                 *pos++ = rates_len - count;
 772
 773                 for (i++; i < sband->n_bitrates; i++) {
 774                         if (BIT(i) & rates) {
 775                                 int rate = sband->bitrates[i].bitrate;
 776                                 *pos++ = (u8) (rate / 5);
 777                         }
 778                 }
 779         }
 780
 781         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 782                 /* 1. power capabilities */
 783                 pos = skb_put(skb, 4);
 784                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 785                 *pos++ = 2;
 786                 *pos++ = 0; /* min tx power */
 787                 *pos++ = chan->max_power; /* max tx power */
 788
 789                 /* 2. supported channels */
 790                 /* TODO: get this in reg domain format */
 791                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 792                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 793                 *pos++ = 2 * sband->n_channels;
 794                 for (i = 0; i < sband->n_channels; i++) {
 795                         *pos++ = ieee80211_frequency_to_channel(
 796                                         sband->channels[i].center_freq);
 797                         *pos++ = 1; /* one channel in the subband*/
 798                 }
 799         }
 800
 801         /* if present, add any custom IEs that go before HT */
 802         if (assoc_data->ie_len && assoc_data->ie) {
 803                 static const u8 before_ht[] = {
 804                         WLAN_EID_SSID,
 805                         WLAN_EID_SUPP_RATES,
 806                         WLAN_EID_EXT_SUPP_RATES,
 807                         WLAN_EID_PWR_CAPABILITY,
 808                         WLAN_EID_SUPPORTED_CHANNELS,
 809                         WLAN_EID_RSN,
 810                         WLAN_EID_QOS_CAPA,
 811                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 812                         WLAN_EID_MOBILITY_DOMAIN,
 813                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 814                 };
 815                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 816                                              before_ht, ARRAY_SIZE(before_ht),
 817                                              offset);
 818                 pos = skb_put(skb, noffset - offset);
 819                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 820                 offset = noffset;
 821         }
 822
 823         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 824                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 825                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 826
 827         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 828                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 829                                     sband, chan, sdata->smps_mode);
 830
 831         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 832                 ieee80211_add_vht_ie(sdata, skb, sband,
 833                                      &assoc_data->ap_vht_cap);
 834
 835         /* if present, add any custom non-vendor IEs that go after HT */
 836         if (assoc_data->ie_len && assoc_data->ie) {
 837                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 838                                                     assoc_data->ie_len,
 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 (assoc_data->wmm) {
 846                 if (assoc_data->uapsd) {
 847                         qos_info = ifmgd->uapsd_queues;
 848                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 849                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 850                 } else {
 851                         qos_info = 0;
 852                 }
 853
 854                 pos = skb_put(skb, 9);
 855                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 856                 *pos++ = 7; /* len */
 857                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 858                 *pos++ = 0x50;
 859                 *pos++ = 0xf2;
 860                 *pos++ = 2; /* WME */
 861                 *pos++ = 0; /* WME info */
 862                 *pos++ = 1; /* WME ver */
 863                 *pos++ = qos_info;
 864         }
 865
 866         /* add any remaining custom (i.e. vendor specific here) IEs */
 867         if (assoc_data->ie_len && assoc_data->ie) {
 868                 noffset = assoc_data->ie_len;
 869                 pos = skb_put(skb, noffset - offset);
 870                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 871         }
 872
 873         drv_mgd_prepare_tx(local, sdata);
 874
 875         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 876         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 877                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 878                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 879         ieee80211_tx_skb(sdata, skb);
 880 }
 881
 882 void ieee80211_send_pspoll(struct ieee80211_local *local,
 883                            struct ieee80211_sub_if_data *sdata)
 884 {
 885         struct ieee80211_pspoll *pspoll;
 886         struct sk_buff *skb;
 887
 888         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 889         if (!skb)
 890                 return;
 891
 892         pspoll = (struct ieee80211_pspoll *) skb->data;
 893         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 894
 895         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 896         ieee80211_tx_skb(sdata, skb);
 897 }
 898
 899 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 900                              struct ieee80211_sub_if_data *sdata,
 901                              int powersave)
 902 {
 903         struct sk_buff *skb;
 904         struct ieee80211_hdr_3addr *nullfunc;
 905         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 906
 907         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 908         if (!skb)
 909                 return;
 910
 911         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 912         if (powersave)
 913                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 914
 915         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 916                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 917         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 918                             IEEE80211_STA_CONNECTION_POLL))
 919                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 920
 921         ieee80211_tx_skb(sdata, skb);
 922 }
 923
 924 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 925                                           struct ieee80211_sub_if_data *sdata)
 926 {
 927         struct sk_buff *skb;
 928         struct ieee80211_hdr *nullfunc;
 929         __le16 fc;
 930
 931         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 932                 return;
 933
 934         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 935         if (!skb)
 936                 return;
 937
 938         skb_reserve(skb, local->hw.extra_tx_headroom);
 939
 940         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 941         memset(nullfunc, 0, 30);
 942         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 943                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 944         nullfunc->frame_control = fc;
 945         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 946         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 947         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 948         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 949
 950         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 951         ieee80211_tx_skb(sdata, skb);
 952 }
 953
 954 /* spectrum management related things */
 955 static void ieee80211_chswitch_work(struct work_struct *work)
 956 {
 957         struct ieee80211_sub_if_data *sdata =
 958                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 959         struct ieee80211_local *local = sdata->local;
 960         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 961
 962         if (!ieee80211_sdata_running(sdata))
 963                 return;
 964
 965         mutex_lock(&ifmgd->mtx);
 966         if (!ifmgd->associated)
 967                 goto out;
 968
 969         local->_oper_chandef = local->csa_chandef;
 970
 971         if (!local->ops->channel_switch) {
 972                 /* call "hw_config" only if doing sw channel switch */
 973                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 974         } else {
 975                 /* update the device channel directly */
 976                 local->hw.conf.chandef = local->_oper_chandef;
 977         }
 978
 979         /* XXX: shouldn't really modify cfg80211-owned data! */
 980         ifmgd->associated->channel = local->_oper_chandef.chan;
 981
 982         /* XXX: wait for a beacon first? */
 983         ieee80211_wake_queues_by_reason(&local->hw,
 984                                         IEEE80211_MAX_QUEUE_MAP,
 985                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 986  out:
 987         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 988         mutex_unlock(&ifmgd->mtx);
 989 }
 990
 991 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 992 {
 993         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 994         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 995
 996         trace_api_chswitch_done(sdata, success);
 997         if (!success) {
 998                 sdata_info(sdata,
 999                            "driver channel switch failed, disconnecting\n");
1000                 ieee80211_queue_work(&sdata->local->hw,
1001                                      &ifmgd->csa_connection_drop_work);
1002         } else {
1003                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1004         }
1005 }
1006 EXPORT_SYMBOL(ieee80211_chswitch_done);
1007
1008 static void ieee80211_chswitch_timer(unsigned long data)
1009 {
1010         struct ieee80211_sub_if_data *sdata =
1011                 (struct ieee80211_sub_if_data *) data;
1012
1013         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1014 }
1015
1016 static void
1017 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1018                                  u64 timestamp, struct ieee802_11_elems *elems)
1019 {
1020         struct ieee80211_local *local = sdata->local;
1021         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1022         struct cfg80211_bss *cbss = ifmgd->associated;
1023         struct ieee80211_bss *bss;
1024         struct ieee80211_chanctx *chanctx;
1025         enum ieee80211_band new_band;
1026         int new_freq;
1027         u8 new_chan_no;
1028         u8 count;
1029         u8 mode;
1030         struct ieee80211_channel *new_chan;
1031         struct cfg80211_chan_def new_chandef = {};
1032         struct cfg80211_chan_def new_vht_chandef = {};
1033         const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
1034         const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
1035         int secondary_channel_offset = -1;
1036
1037         ASSERT_MGD_MTX(ifmgd);
1038
1039         if (!cbss)
1040                 return;
1041
1042         if (local->scanning)
1043                 return;
1044
1045         /* disregard subsequent announcements if we are already processing */
1046         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1047                 return;
1048
1049         sec_chan_offs = elems->sec_chan_offs;
1050         wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
1051
1052         if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
1053                             IEEE80211_STA_DISABLE_40MHZ)) {
1054                 sec_chan_offs = NULL;
1055                 wide_bw_chansw_ie = NULL;
1056         }
1057
1058         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
1059                 wide_bw_chansw_ie = NULL;
1060
1061         if (elems->ext_chansw_ie) {
1062                 if (!ieee80211_operating_class_to_band(
1063                                 elems->ext_chansw_ie->new_operating_class,
1064                                 &new_band)) {
1065                         sdata_info(sdata,
1066                                    "cannot understand ECSA IE operating class %d, disconnecting\n",
1067                                    elems->ext_chansw_ie->new_operating_class);
1068                         ieee80211_queue_work(&local->hw,
1069                                              &ifmgd->csa_connection_drop_work);
1070                 }
1071                 new_chan_no = elems->ext_chansw_ie->new_ch_num;
1072                 count = elems->ext_chansw_ie->count;
1073                 mode = elems->ext_chansw_ie->mode;
1074         } else if (elems->ch_switch_ie) {
1075                 new_band = cbss->channel->band;
1076                 new_chan_no = elems->ch_switch_ie->new_ch_num;
1077                 count = elems->ch_switch_ie->count;
1078                 mode = elems->ch_switch_ie->mode;
1079         } else {
1080                 /* nothing here we understand */
1081                 return;
1082         }
1083
1084         bss = (void *)cbss->priv;
1085
1086         new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
1087         new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
1088         if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
1089                 sdata_info(sdata,
1090                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
1091                            ifmgd->associated->bssid, new_freq);
1092                 ieee80211_queue_work(&local->hw,
1093                                      &ifmgd->csa_connection_drop_work);
1094                 return;
1095         }
1096
1097         if (sec_chan_offs) {
1098                 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
1099         } else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
1100                 /* if HT is enabled and the IE not present, it's still HT */
1101                 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1102         }
1103
1104         switch (secondary_channel_offset) {
1105         default:
1106                 /* secondary_channel_offset was present but is invalid */
1107         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1108                 cfg80211_chandef_create(&new_chandef, new_chan,
1109                                         NL80211_CHAN_HT20);
1110                 break;
1111         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1112                 cfg80211_chandef_create(&new_chandef, new_chan,
1113                                         NL80211_CHAN_HT40PLUS);
1114                 break;
1115         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1116                 cfg80211_chandef_create(&new_chandef, new_chan,
1117                                         NL80211_CHAN_HT40MINUS);
1118                 break;
1119         case -1:
1120                 cfg80211_chandef_create(&new_chandef, new_chan,
1121                                         NL80211_CHAN_NO_HT);
1122                 break;
1123         }
1124
1125         if (wide_bw_chansw_ie) {
1126                 new_vht_chandef.chan = new_chan;
1127                 new_vht_chandef.center_freq1 =
1128                         ieee80211_channel_to_frequency(
1129                                 wide_bw_chansw_ie->new_center_freq_seg0,
1130                                 new_band);
1131
1132                 switch (wide_bw_chansw_ie->new_channel_width) {
1133                 default:
1134                         /* hmmm, ignore VHT and use HT if present */
1135                 case IEEE80211_VHT_CHANWIDTH_USE_HT:
1136                         new_vht_chandef.chan = NULL;
1137                         break;
1138                 case IEEE80211_VHT_CHANWIDTH_80MHZ:
1139                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
1140                         break;
1141                 case IEEE80211_VHT_CHANWIDTH_160MHZ:
1142                         new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
1143                         break;
1144                 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
1145                         /* field is otherwise reserved */
1146                         new_vht_chandef.center_freq2 =
1147                                 ieee80211_channel_to_frequency(
1148                                         wide_bw_chansw_ie->new_center_freq_seg1,
1149                                         new_band);
1150                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
1151                         break;
1152                 }
1153                 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
1154                     new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
1155                         chandef_downgrade(&new_vht_chandef);
1156                 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
1157                     new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
1158                         chandef_downgrade(&new_vht_chandef);
1159                 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
1160                     new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
1161                         chandef_downgrade(&new_vht_chandef);
1162         }
1163
1164         /* if VHT data is there validate & use it */
1165         if (new_vht_chandef.chan) {
1166                 if (!cfg80211_chandef_compatible(&new_vht_chandef,
1167                                                  &new_chandef)) {
1168                         sdata_info(sdata,
1169                                    "AP %pM CSA has inconsistent channel data, disconnecting\n",
1170                                    ifmgd->associated->bssid);
1171                         ieee80211_queue_work(&local->hw,
1172                                              &ifmgd->csa_connection_drop_work);
1173                         return;
1174                 }
1175                 new_chandef = new_vht_chandef;
1176         }
1177
1178         if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
1179                                      IEEE80211_CHAN_DISABLED)) {
1180                 sdata_info(sdata,
1181                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1182                            ifmgd->associated->bssid, new_freq,
1183                            new_chandef.width, new_chandef.center_freq1,
1184                            new_chandef.center_freq2);
1185                 ieee80211_queue_work(&local->hw,
1186                                      &ifmgd->csa_connection_drop_work);
1187                 return;
1188         }
1189
1190         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1191
1192         if (local->use_chanctx) {
1193                 sdata_info(sdata,
1194                            "not handling channel switch with channel contexts\n");
1195                 ieee80211_queue_work(&local->hw,
1196                                      &ifmgd->csa_connection_drop_work);
1197                 return;
1198         }
1199
1200         mutex_lock(&local->chanctx_mtx);
1201         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1202                 mutex_unlock(&local->chanctx_mtx);
1203                 return;
1204         }
1205         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1206                                struct ieee80211_chanctx, conf);
1207         if (chanctx->refcount > 1) {
1208                 sdata_info(sdata,
1209                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1210                 ieee80211_queue_work(&local->hw,
1211                                      &ifmgd->csa_connection_drop_work);
1212                 mutex_unlock(&local->chanctx_mtx);
1213                 return;
1214         }
1215         mutex_unlock(&local->chanctx_mtx);
1216
1217         local->csa_chandef = new_chandef;
1218
1219         if (mode)
1220                 ieee80211_stop_queues_by_reason(&local->hw,
1221                                 IEEE80211_MAX_QUEUE_MAP,
1222                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1223
1224         if (local->ops->channel_switch) {
1225                 /* use driver's channel switch callback */
1226                 struct ieee80211_channel_switch ch_switch = {
1227                         .timestamp = timestamp,
1228                         .block_tx = mode,
1229                         .chandef = new_chandef,
1230                         .count = count,
1231                 };
1232
1233                 drv_channel_switch(local, &ch_switch);
1234                 return;
1235         }
1236
1237         /* channel switch handled in software */
1238         if (count <= 1)
1239                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1240         else
1241                 mod_timer(&ifmgd->chswitch_timer,
1242                           TU_TO_EXP_TIME(count * cbss->beacon_interval));
1243 }
1244
1245 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1246                                        struct ieee80211_channel *channel,
1247                                        const u8 *country_ie, u8 country_ie_len,
1248                                        const u8 *pwr_constr_elem)
1249 {
1250         struct ieee80211_country_ie_triplet *triplet;
1251         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1252         int i, chan_pwr, chan_increment, new_ap_level;
1253         bool have_chan_pwr = false;
1254
1255         /* Invalid IE */
1256         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1257                 return 0;
1258
1259         triplet = (void *)(country_ie + 3);
1260         country_ie_len -= 3;
1261
1262         switch (channel->band) {
1263         default:
1264                 WARN_ON_ONCE(1);
1265                 /* fall through */
1266         case IEEE80211_BAND_2GHZ:
1267         case IEEE80211_BAND_60GHZ:
1268                 chan_increment = 1;
1269                 break;
1270         case IEEE80211_BAND_5GHZ:
1271                 chan_increment = 4;
1272                 break;
1273         }
1274
1275         /* find channel */
1276         while (country_ie_len >= 3) {
1277                 u8 first_channel = triplet->chans.first_channel;
1278
1279                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1280                         goto next;
1281
1282                 for (i = 0; i < triplet->chans.num_channels; i++) {
1283                         if (first_channel + i * chan_increment == chan) {
1284                                 have_chan_pwr = true;
1285                                 chan_pwr = triplet->chans.max_power;
1286                                 break;
1287                         }
1288                 }
1289                 if (have_chan_pwr)
1290                         break;
1291
1292  next:
1293                 triplet++;
1294                 country_ie_len -= 3;
1295         }
1296
1297         if (!have_chan_pwr)
1298                 return 0;
1299
1300         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1301
1302         if (sdata->ap_power_level == new_ap_level)
1303                 return 0;
1304
1305         sdata_info(sdata,
1306                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1307                    new_ap_level, chan_pwr, *pwr_constr_elem,
1308                    sdata->u.mgd.bssid);
1309         sdata->ap_power_level = new_ap_level;
1310         if (__ieee80211_recalc_txpower(sdata))
1311                 return BSS_CHANGED_TXPOWER;
1312         return 0;
1313 }
1314
1315 /* powersave */
1316 static void ieee80211_enable_ps(struct ieee80211_local *local,
1317                                 struct ieee80211_sub_if_data *sdata)
1318 {
1319         struct ieee80211_conf *conf = &local->hw.conf;
1320
1321         /*
1322          * If we are scanning right now then the parameters will
1323          * take effect when scan finishes.
1324          */
1325         if (local->scanning)
1326                 return;
1327
1328         if (conf->dynamic_ps_timeout > 0 &&
1329             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1330                 mod_timer(&local->dynamic_ps_timer, jiffies +
1331                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1332         } else {
1333                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1334                         ieee80211_send_nullfunc(local, sdata, 1);
1335
1336                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1337                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1338                         return;
1339
1340                 conf->flags |= IEEE80211_CONF_PS;
1341                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1342         }
1343 }
1344
1345 static void ieee80211_change_ps(struct ieee80211_local *local)
1346 {
1347         struct ieee80211_conf *conf = &local->hw.conf;
1348
1349         if (local->ps_sdata) {
1350                 ieee80211_enable_ps(local, local->ps_sdata);
1351         } else if (conf->flags & IEEE80211_CONF_PS) {
1352                 conf->flags &= ~IEEE80211_CONF_PS;
1353                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1354                 del_timer_sync(&local->dynamic_ps_timer);
1355                 cancel_work_sync(&local->dynamic_ps_enable_work);
1356         }
1357 }
1358
1359 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1360 {
1361         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1362         struct sta_info *sta = NULL;
1363         bool authorized = false;
1364
1365         if (!mgd->powersave)
1366                 return false;
1367
1368         if (mgd->broken_ap)
1369                 return false;
1370
1371         if (!mgd->associated)
1372                 return false;
1373
1374         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1375                           IEEE80211_STA_CONNECTION_POLL))
1376                 return false;
1377
1378         rcu_read_lock();
1379         sta = sta_info_get(sdata, mgd->bssid);
1380         if (sta)
1381                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1382         rcu_read_unlock();
1383
1384         return authorized;
1385 }
1386
1387 /* need to hold RTNL or interface lock */
1388 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1389 {
1390         struct ieee80211_sub_if_data *sdata, *found = NULL;
1391         int count = 0;
1392         int timeout;
1393
1394         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1395                 local->ps_sdata = NULL;
1396                 return;
1397         }
1398
1399         list_for_each_entry(sdata, &local->interfaces, list) {
1400                 if (!ieee80211_sdata_running(sdata))
1401                         continue;
1402                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1403                         /* If an AP vif is found, then disable PS
1404                          * by setting the count to zero thereby setting
1405                          * ps_sdata to NULL.
1406                          */
1407                         count = 0;
1408                         break;
1409                 }
1410                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1411                         continue;
1412                 found = sdata;
1413                 count++;
1414         }
1415
1416         if (count == 1 && ieee80211_powersave_allowed(found)) {
1417                 s32 beaconint_us;
1418
1419                 if (latency < 0)
1420                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1421
1422                 beaconint_us = ieee80211_tu_to_usec(
1423                                         found->vif.bss_conf.beacon_int);
1424
1425                 timeout = local->dynamic_ps_forced_timeout;
1426                 if (timeout < 0) {
1427                         /*
1428                          * Go to full PSM if the user configures a very low
1429                          * latency requirement.
1430                          * The 2000 second value is there for compatibility
1431                          * until the PM_QOS_NETWORK_LATENCY is configured
1432                          * with real values.
1433                          */
1434                         if (latency > (1900 * USEC_PER_MSEC) &&
1435                             latency != (2000 * USEC_PER_SEC))
1436                                 timeout = 0;
1437                         else
1438                                 timeout = 100;
1439                 }
1440                 local->hw.conf.dynamic_ps_timeout = timeout;
1441
1442                 if (beaconint_us > latency) {
1443                         local->ps_sdata = NULL;
1444                 } else {
1445                         int maxslp = 1;
1446                         u8 dtimper = found->u.mgd.dtim_period;
1447
1448                         /* If the TIM IE is invalid, pretend the value is 1 */
1449                         if (!dtimper)
1450                                 dtimper = 1;
1451                         else if (dtimper > 1)
1452                                 maxslp = min_t(int, dtimper,
1453                                                     latency / beaconint_us);
1454
1455                         local->hw.conf.max_sleep_period = maxslp;
1456                         local->hw.conf.ps_dtim_period = dtimper;
1457                         local->ps_sdata = found;
1458                 }
1459         } else {
1460                 local->ps_sdata = NULL;
1461         }
1462
1463         ieee80211_change_ps(local);
1464 }
1465
1466 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1467 {
1468         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1469
1470         if (sdata->vif.bss_conf.ps != ps_allowed) {
1471                 sdata->vif.bss_conf.ps = ps_allowed;
1472                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1473         }
1474 }
1475
1476 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1477 {
1478         struct ieee80211_local *local =
1479                 container_of(work, struct ieee80211_local,
1480                              dynamic_ps_disable_work);
1481
1482         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1483                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1484                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1485         }
1486
1487         ieee80211_wake_queues_by_reason(&local->hw,
1488                                         IEEE80211_MAX_QUEUE_MAP,
1489                                         IEEE80211_QUEUE_STOP_REASON_PS);
1490 }
1491
1492 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1493 {
1494         struct ieee80211_local *local =
1495                 container_of(work, struct ieee80211_local,
1496                              dynamic_ps_enable_work);
1497         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1498         struct ieee80211_if_managed *ifmgd;
1499         unsigned long flags;
1500         int q;
1501
1502         /* can only happen when PS was just disabled anyway */
1503         if (!sdata)
1504                 return;
1505
1506         ifmgd = &sdata->u.mgd;
1507
1508         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1509                 return;
1510
1511         if (local->hw.conf.dynamic_ps_timeout > 0) {
1512                 /* don't enter PS if TX frames are pending */
1513                 if (drv_tx_frames_pending(local)) {
1514                         mod_timer(&local->dynamic_ps_timer, jiffies +
1515                                   msecs_to_jiffies(
1516                                   local->hw.conf.dynamic_ps_timeout));
1517                         return;
1518                 }
1519
1520                 /*
1521                  * transmission can be stopped by others which leads to
1522                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1523                  * is not the actual idle state.
1524                  */
1525                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1526                 for (q = 0; q < local->hw.queues; q++) {
1527                         if (local->queue_stop_reasons[q]) {
1528                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1529                                                        flags);
1530                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1531                                           msecs_to_jiffies(
1532                                           local->hw.conf.dynamic_ps_timeout));
1533                                 return;
1534                         }
1535                 }
1536                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1537         }
1538
1539         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1540             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1541                 if (drv_tx_frames_pending(local)) {
1542                         mod_timer(&local->dynamic_ps_timer, jiffies +
1543                                   msecs_to_jiffies(
1544                                   local->hw.conf.dynamic_ps_timeout));
1545                 } else {
1546                         ieee80211_send_nullfunc(local, sdata, 1);
1547                         /* Flush to get the tx status of nullfunc frame */
1548                         ieee80211_flush_queues(local, sdata);
1549                 }
1550         }
1551
1552         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1553               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1554             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1555                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1556                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1557                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1558         }
1559 }
1560
1561 void ieee80211_dynamic_ps_timer(unsigned long data)
1562 {
1563         struct ieee80211_local *local = (void *) data;
1564
1565         if (local->quiescing || local->suspended)
1566                 return;
1567
1568         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1569 }
1570
1571 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1572 {
1573         struct delayed_work *delayed_work =
1574                 container_of(work, struct delayed_work, work);
1575         struct ieee80211_sub_if_data *sdata =
1576                 container_of(delayed_work, struct ieee80211_sub_if_data,
1577                              dfs_cac_timer_work);
1578
1579         ieee80211_vif_release_channel(sdata);
1580
1581         cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1582 }
1583
1584 /* MLME */
1585 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1586                                      struct ieee80211_sub_if_data *sdata,
1587                                      const u8 *wmm_param, size_t wmm_param_len)
1588 {
1589         struct ieee80211_tx_queue_params params;
1590         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1591         size_t left;
1592         int count;
1593         const u8 *pos;
1594         u8 uapsd_queues = 0;
1595
1596         if (!local->ops->conf_tx)
1597                 return false;
1598
1599         if (local->hw.queues < IEEE80211_NUM_ACS)
1600                 return false;
1601
1602         if (!wmm_param)
1603                 return false;
1604
1605         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1606                 return false;
1607
1608         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1609                 uapsd_queues = ifmgd->uapsd_queues;
1610
1611         count = wmm_param[6] & 0x0f;
1612         if (count == ifmgd->wmm_last_param_set)
1613                 return false;
1614         ifmgd->wmm_last_param_set = count;
1615
1616         pos = wmm_param + 8;
1617         left = wmm_param_len - 8;
1618
1619         memset(&params, 0, sizeof(params));
1620
1621         sdata->wmm_acm = 0;
1622         for (; left >= 4; left -= 4, pos += 4) {
1623                 int aci = (pos[0] >> 5) & 0x03;
1624                 int acm = (pos[0] >> 4) & 0x01;
1625                 bool uapsd = false;
1626                 int queue;
1627
1628                 switch (aci) {
1629                 case 1: /* AC_BK */
1630                         queue = 3;
1631                         if (acm)
1632                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1633                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1634                                 uapsd = true;
1635                         break;
1636                 case 2: /* AC_VI */
1637                         queue = 1;
1638                         if (acm)
1639                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1640                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1641                                 uapsd = true;
1642                         break;
1643                 case 3: /* AC_VO */
1644                         queue = 0;
1645                         if (acm)
1646                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1647                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1648                                 uapsd = true;
1649                         break;
1650                 case 0: /* AC_BE */
1651                 default:
1652                         queue = 2;
1653                         if (acm)
1654                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1655                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1656                                 uapsd = true;
1657                         break;
1658                 }
1659
1660                 params.aifs = pos[0] & 0x0f;
1661                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1662                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1663                 params.txop = get_unaligned_le16(pos + 2);
1664                 params.uapsd = uapsd;
1665
1666                 mlme_dbg(sdata,
1667                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1668                          queue, aci, acm,
1669                          params.aifs, params.cw_min, params.cw_max,
1670                          params.txop, params.uapsd);
1671                 sdata->tx_conf[queue] = params;
1672                 if (drv_conf_tx(local, sdata, queue, &params))
1673                         sdata_err(sdata,
1674                                   "failed to set TX queue parameters for queue %d\n",
1675                                   queue);
1676         }
1677
1678         /* enable WMM or activate new settings */
1679         sdata->vif.bss_conf.qos = true;
1680         return true;
1681 }
1682
1683 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1684 {
1685         lockdep_assert_held(&sdata->local->mtx);
1686
1687         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1688                                 IEEE80211_STA_BEACON_POLL);
1689         ieee80211_run_deferred_scan(sdata->local);
1690 }
1691
1692 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1693 {
1694         mutex_lock(&sdata->local->mtx);
1695         __ieee80211_stop_poll(sdata);
1696         mutex_unlock(&sdata->local->mtx);
1697 }
1698
1699 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1700                                            u16 capab, bool erp_valid, u8 erp)
1701 {
1702         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1703         u32 changed = 0;
1704         bool use_protection;
1705         bool use_short_preamble;
1706         bool use_short_slot;
1707
1708         if (erp_valid) {
1709                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1710                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1711         } else {
1712                 use_protection = false;
1713                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1714         }
1715
1716         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1717         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1718                 use_short_slot = true;
1719
1720         if (use_protection != bss_conf->use_cts_prot) {
1721                 bss_conf->use_cts_prot = use_protection;
1722                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1723         }
1724
1725         if (use_short_preamble != bss_conf->use_short_preamble) {
1726                 bss_conf->use_short_preamble = use_short_preamble;
1727                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1728         }
1729
1730         if (use_short_slot != bss_conf->use_short_slot) {
1731                 bss_conf->use_short_slot = use_short_slot;
1732                 changed |= BSS_CHANGED_ERP_SLOT;
1733         }
1734
1735         return changed;
1736 }
1737
1738 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1739                                      struct cfg80211_bss *cbss,
1740                                      u32 bss_info_changed)
1741 {
1742         struct ieee80211_bss *bss = (void *)cbss->priv;
1743         struct ieee80211_local *local = sdata->local;
1744         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1745
1746         bss_info_changed |= BSS_CHANGED_ASSOC;
1747         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1748                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1749
1750         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1751                 beacon_loss_count * bss_conf->beacon_int));
1752
1753         sdata->u.mgd.associated = cbss;
1754         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1755
1756         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1757
1758         if (sdata->vif.p2p) {
1759                 const struct cfg80211_bss_ies *ies;
1760
1761                 rcu_read_lock();
1762                 ies = rcu_dereference(cbss->ies);
1763                 if (ies) {
1764                         int ret;
1765
1766                         ret = cfg80211_get_p2p_attr(
1767                                         ies->data, ies->len,
1768                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1769                                         (u8 *) &bss_conf->p2p_noa_attr,
1770                                         sizeof(bss_conf->p2p_noa_attr));
1771                         if (ret >= 2) {
1772                                 sdata->u.mgd.p2p_noa_index =
1773                                         bss_conf->p2p_noa_attr.index;
1774                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1775                         }
1776                 }
1777                 rcu_read_unlock();
1778         }
1779
1780         /* just to be sure */
1781         ieee80211_stop_poll(sdata);
1782
1783         ieee80211_led_assoc(local, 1);
1784
1785         if (sdata->u.mgd.assoc_data->have_beacon) {
1786                 /*
1787                  * If the AP is buggy we may get here with no DTIM period
1788                  * known, so assume it's 1 which is the only safe assumption
1789                  * in that case, although if the TIM IE is broken powersave
1790                  * probably just won't work at all.
1791                  */
1792                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1793                 bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
1794         } else {
1795                 bss_conf->dtim_period = 0;
1796         }
1797
1798         bss_conf->assoc = 1;
1799
1800         /* Tell the driver to monitor connection quality (if supported) */
1801         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1802             bss_conf->cqm_rssi_thold)
1803                 bss_info_changed |= BSS_CHANGED_CQM;
1804
1805         /* Enable ARP filtering */
1806         if (bss_conf->arp_addr_cnt)
1807                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1808
1809         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1810
1811         mutex_lock(&local->iflist_mtx);
1812         ieee80211_recalc_ps(local, -1);
1813         mutex_unlock(&local->iflist_mtx);
1814
1815         ieee80211_recalc_smps(sdata);
1816         ieee80211_recalc_ps_vif(sdata);
1817
1818         netif_carrier_on(sdata->dev);
1819 }
1820
1821 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1822                                    u16 stype, u16 reason, bool tx,
1823                                    u8 *frame_buf)
1824 {
1825         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1826         struct ieee80211_local *local = sdata->local;
1827         u32 changed = 0;
1828
1829         ASSERT_MGD_MTX(ifmgd);
1830
1831         if (WARN_ON_ONCE(tx && !frame_buf))
1832                 return;
1833
1834         if (WARN_ON(!ifmgd->associated))
1835                 return;
1836
1837         ieee80211_stop_poll(sdata);
1838
1839         ifmgd->associated = NULL;
1840         netif_carrier_off(sdata->dev);
1841
1842         /*
1843          * if we want to get out of ps before disassoc (why?) we have
1844          * to do it before sending disassoc, as otherwise the null-packet
1845          * won't be valid.
1846          */
1847         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1848                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1849                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1850         }
1851         local->ps_sdata = NULL;
1852
1853         /* disable per-vif ps */
1854         ieee80211_recalc_ps_vif(sdata);
1855
1856         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1857         if (tx)
1858                 ieee80211_flush_queues(local, sdata);
1859
1860         /* deauthenticate/disassociate now */
1861         if (tx || frame_buf)
1862                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1863                                                reason, tx, frame_buf);
1864
1865         /* flush out frame */
1866         if (tx)
1867                 ieee80211_flush_queues(local, sdata);
1868
1869         /* clear bssid only after building the needed mgmt frames */
1870         memset(ifmgd->bssid, 0, ETH_ALEN);
1871
1872         /* remove AP and TDLS peers */
1873         sta_info_flush_defer(sdata);
1874
1875         /* finally reset all BSS / config parameters */
1876         changed |= ieee80211_reset_erp_info(sdata);
1877
1878         ieee80211_led_assoc(local, 0);
1879         changed |= BSS_CHANGED_ASSOC;
1880         sdata->vif.bss_conf.assoc = false;
1881
1882         ifmgd->p2p_noa_index = -1;
1883         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1884                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1885
1886         /* on the next assoc, re-program HT/VHT parameters */
1887         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1888         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1889         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1890         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1891
1892         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1893
1894         del_timer_sync(&local->dynamic_ps_timer);
1895         cancel_work_sync(&local->dynamic_ps_enable_work);
1896
1897         /* Disable ARP filtering */
1898         if (sdata->vif.bss_conf.arp_addr_cnt)
1899                 changed |= BSS_CHANGED_ARP_FILTER;
1900
1901         sdata->vif.bss_conf.qos = false;
1902         changed |= BSS_CHANGED_QOS;
1903
1904         /* The BSSID (not really interesting) and HT changed */
1905         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1906         ieee80211_bss_info_change_notify(sdata, changed);
1907
1908         /* disassociated - set to defaults now */
1909         ieee80211_set_wmm_default(sdata, false);
1910
1911         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1912         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1913         del_timer_sync(&sdata->u.mgd.timer);
1914         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1915
1916         sdata->vif.bss_conf.dtim_period = 0;
1917
1918         ifmgd->flags = 0;
1919         ieee80211_vif_release_channel(sdata);
1920 }
1921
1922 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1923                              struct ieee80211_hdr *hdr)
1924 {
1925         /*
1926          * We can postpone the mgd.timer whenever receiving unicast frames
1927          * from AP because we know that the connection is working both ways
1928          * at that time. But multicast frames (and hence also beacons) must
1929          * be ignored here, because we need to trigger the timer during
1930          * data idle periods for sending the periodic probe request to the
1931          * AP we're connected to.
1932          */
1933         if (is_multicast_ether_addr(hdr->addr1))
1934                 return;
1935
1936         ieee80211_sta_reset_conn_monitor(sdata);
1937 }
1938
1939 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1940 {
1941         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1942         struct ieee80211_local *local = sdata->local;
1943
1944         mutex_lock(&local->mtx);
1945         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1946                               IEEE80211_STA_CONNECTION_POLL))) {
1947                 mutex_unlock(&local->mtx);
1948                 return;
1949         }
1950
1951         __ieee80211_stop_poll(sdata);
1952
1953         mutex_lock(&local->iflist_mtx);
1954         ieee80211_recalc_ps(local, -1);
1955         mutex_unlock(&local->iflist_mtx);
1956
1957         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1958                 goto out;
1959
1960         /*
1961          * We've received a probe response, but are not sure whether
1962          * we have or will be receiving any beacons or data, so let's
1963          * schedule the timers again, just in case.
1964          */
1965         ieee80211_sta_reset_beacon_monitor(sdata);
1966
1967         mod_timer(&ifmgd->conn_mon_timer,
1968                   round_jiffies_up(jiffies +
1969                                    IEEE80211_CONNECTION_IDLE_TIME));
1970 out:
1971         mutex_unlock(&local->mtx);
1972 }
1973
1974 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1975                              struct ieee80211_hdr *hdr, bool ack)
1976 {
1977         if (!ieee80211_is_data(hdr->frame_control))
1978             return;
1979
1980         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1981             sdata->u.mgd.probe_send_count > 0) {
1982                 if (ack)
1983                         ieee80211_sta_reset_conn_monitor(sdata);
1984                 else
1985                         sdata->u.mgd.nullfunc_failed = true;
1986                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1987                 return;
1988         }
1989
1990         if (ack)
1991                 ieee80211_sta_reset_conn_monitor(sdata);
1992 }
1993
1994 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1995 {
1996         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1997         const u8 *ssid;
1998         u8 *dst = ifmgd->associated->bssid;
1999         u8 unicast_limit = max(1, max_probe_tries - 3);
2000
2001         /*
2002          * Try sending broadcast probe requests for the last three
2003          * probe requests after the first ones failed since some
2004          * buggy APs only support broadcast probe requests.
2005          */
2006         if (ifmgd->probe_send_count >= unicast_limit)
2007                 dst = NULL;
2008
2009         /*
2010          * When the hardware reports an accurate Tx ACK status, it's
2011          * better to send a nullfunc frame instead of a probe request,
2012          * as it will kick us off the AP quickly if we aren't associated
2013          * anymore. The timeout will be reset if the frame is ACKed by
2014          * the AP.
2015          */
2016         ifmgd->probe_send_count++;
2017
2018         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2019                 ifmgd->nullfunc_failed = false;
2020                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2021         } else {
2022                 int ssid_len;
2023
2024                 rcu_read_lock();
2025                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2026                 if (WARN_ON_ONCE(ssid == NULL))
2027                         ssid_len = 0;
2028                 else
2029                         ssid_len = ssid[1];
2030
2031                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2032                                          0, (u32) -1, true, 0,
2033                                          ifmgd->associated->channel, false);
2034                 rcu_read_unlock();
2035         }
2036
2037         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2038         run_again(ifmgd, ifmgd->probe_timeout);
2039         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2040                 ieee80211_flush_queues(sdata->local, sdata);
2041 }
2042
2043 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2044                                    bool beacon)
2045 {
2046         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2047         bool already = false;
2048
2049         if (!ieee80211_sdata_running(sdata))
2050                 return;
2051
2052         mutex_lock(&ifmgd->mtx);
2053
2054         if (!ifmgd->associated)
2055                 goto out;
2056
2057         mutex_lock(&sdata->local->mtx);
2058
2059         if (sdata->local->tmp_channel || sdata->local->scanning) {
2060                 mutex_unlock(&sdata->local->mtx);
2061                 goto out;
2062         }
2063
2064         if (beacon) {
2065                 mlme_dbg_ratelimited(sdata,
2066                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2067                                      beacon_loss_count);
2068
2069                 ieee80211_cqm_rssi_notify(&sdata->vif,
2070                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2071                                           GFP_KERNEL);
2072         }
2073
2074         /*
2075          * The driver/our work has already reported this event or the
2076          * connection monitoring has kicked in and we have already sent
2077          * a probe request. Or maybe the AP died and the driver keeps
2078          * reporting until we disassociate...
2079          *
2080          * In either case we have to ignore the current call to this
2081          * function (except for setting the correct probe reason bit)
2082          * because otherwise we would reset the timer every time and
2083          * never check whether we received a probe response!
2084          */
2085         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2086                             IEEE80211_STA_CONNECTION_POLL))
2087                 already = true;
2088
2089         if (beacon)
2090                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
2091         else
2092                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2093
2094         mutex_unlock(&sdata->local->mtx);
2095
2096         if (already)
2097                 goto out;
2098
2099         mutex_lock(&sdata->local->iflist_mtx);
2100         ieee80211_recalc_ps(sdata->local, -1);
2101         mutex_unlock(&sdata->local->iflist_mtx);
2102
2103         ifmgd->probe_send_count = 0;
2104         ieee80211_mgd_probe_ap_send(sdata);
2105  out:
2106         mutex_unlock(&ifmgd->mtx);
2107 }
2108
2109 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2110                                           struct ieee80211_vif *vif)
2111 {
2112         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2113         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2114         struct cfg80211_bss *cbss;
2115         struct sk_buff *skb;
2116         const u8 *ssid;
2117         int ssid_len;
2118
2119         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2120                 return NULL;
2121
2122         ASSERT_MGD_MTX(ifmgd);
2123
2124         if (ifmgd->associated)
2125                 cbss = ifmgd->associated;
2126         else if (ifmgd->auth_data)
2127                 cbss = ifmgd->auth_data->bss;
2128         else if (ifmgd->assoc_data)
2129                 cbss = ifmgd->assoc_data->bss;
2130         else
2131                 return NULL;
2132
2133         rcu_read_lock();
2134         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2135         if (WARN_ON_ONCE(ssid == NULL))
2136                 ssid_len = 0;
2137         else
2138                 ssid_len = ssid[1];
2139
2140         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2141                                         (u32) -1, cbss->channel,
2142                                         ssid + 2, ssid_len,
2143                                         NULL, 0, true);
2144         rcu_read_unlock();
2145
2146         return skb;
2147 }
2148 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2149
2150 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2151 {
2152         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2153         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2154
2155         mutex_lock(&ifmgd->mtx);
2156         if (!ifmgd->associated) {
2157                 mutex_unlock(&ifmgd->mtx);
2158                 return;
2159         }
2160
2161         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2162                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2163                                true, frame_buf);
2164         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2165         ieee80211_wake_queues_by_reason(&sdata->local->hw,
2166                                         IEEE80211_MAX_QUEUE_MAP,
2167                                         IEEE80211_QUEUE_STOP_REASON_CSA);
2168         mutex_unlock(&ifmgd->mtx);
2169
2170         /*
2171          * must be outside lock due to cfg80211,
2172          * but that's not a problem.
2173          */
2174         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2175 }
2176
2177 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2178 {
2179         struct ieee80211_sub_if_data *sdata =
2180                 container_of(work, struct ieee80211_sub_if_data,
2181                              u.mgd.beacon_connection_loss_work);
2182         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2183         struct sta_info *sta;
2184
2185         if (ifmgd->associated) {
2186                 rcu_read_lock();
2187                 sta = sta_info_get(sdata, ifmgd->bssid);
2188                 if (sta)
2189                         sta->beacon_loss_count++;
2190                 rcu_read_unlock();
2191         }
2192
2193         if (ifmgd->connection_loss) {
2194                 sdata_info(sdata, "Connection to AP %pM lost\n",
2195                            ifmgd->bssid);
2196                 __ieee80211_disconnect(sdata);
2197         } else {
2198                 ieee80211_mgd_probe_ap(sdata, true);
2199         }
2200 }
2201
2202 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2203 {
2204         struct ieee80211_sub_if_data *sdata =
2205                 container_of(work, struct ieee80211_sub_if_data,
2206                              u.mgd.csa_connection_drop_work);
2207
2208         __ieee80211_disconnect(sdata);
2209 }
2210
2211 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2212 {
2213         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2214         struct ieee80211_hw *hw = &sdata->local->hw;
2215
2216         trace_api_beacon_loss(sdata);
2217
2218         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
2219         sdata->u.mgd.connection_loss = false;
2220         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2221 }
2222 EXPORT_SYMBOL(ieee80211_beacon_loss);
2223
2224 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2225 {
2226         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2227         struct ieee80211_hw *hw = &sdata->local->hw;
2228
2229         trace_api_connection_loss(sdata);
2230
2231         sdata->u.mgd.connection_loss = true;
2232         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2233 }
2234 EXPORT_SYMBOL(ieee80211_connection_loss);
2235
2236
2237 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2238                                         bool assoc)
2239 {
2240         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2241
2242         lockdep_assert_held(&sdata->u.mgd.mtx);
2243
2244         if (!assoc) {
2245                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2246
2247                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2248                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2249                 sdata->u.mgd.flags = 0;
2250                 ieee80211_vif_release_channel(sdata);
2251         }
2252
2253         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2254         kfree(auth_data);
2255         sdata->u.mgd.auth_data = NULL;
2256 }
2257
2258 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2259                                      struct ieee80211_mgmt *mgmt, size_t len)
2260 {
2261         struct ieee80211_local *local = sdata->local;
2262         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2263         u8 *pos;
2264         struct ieee802_11_elems elems;
2265         u32 tx_flags = 0;
2266
2267         pos = mgmt->u.auth.variable;
2268         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2269         if (!elems.challenge)
2270                 return;
2271         auth_data->expected_transaction = 4;
2272         drv_mgd_prepare_tx(sdata->local, sdata);
2273         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2274                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2275                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2276         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2277                             elems.challenge - 2, elems.challenge_len + 2,
2278                             auth_data->bss->bssid, auth_data->bss->bssid,
2279                             auth_data->key, auth_data->key_len,
2280                             auth_data->key_idx, tx_flags);
2281 }
2282
2283 static enum rx_mgmt_action __must_check
2284 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2285                        struct ieee80211_mgmt *mgmt, size_t len)
2286 {
2287         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2288         u8 bssid[ETH_ALEN];
2289         u16 auth_alg, auth_transaction, status_code;
2290         struct sta_info *sta;
2291
2292         lockdep_assert_held(&ifmgd->mtx);
2293
2294         if (len < 24 + 6)
2295                 return RX_MGMT_NONE;
2296
2297         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2298                 return RX_MGMT_NONE;
2299
2300         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2301
2302         if (!ether_addr_equal(bssid, mgmt->bssid))
2303                 return RX_MGMT_NONE;
2304
2305         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2306         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2307         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2308
2309         if (auth_alg != ifmgd->auth_data->algorithm ||
2310             auth_transaction != ifmgd->auth_data->expected_transaction) {
2311                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2312                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2313                            auth_transaction,
2314                            ifmgd->auth_data->expected_transaction);
2315                 return RX_MGMT_NONE;
2316         }
2317
2318         if (status_code != WLAN_STATUS_SUCCESS) {
2319                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2320                            mgmt->sa, status_code);
2321                 ieee80211_destroy_auth_data(sdata, false);
2322                 return RX_MGMT_CFG80211_RX_AUTH;
2323         }
2324
2325         switch (ifmgd->auth_data->algorithm) {
2326         case WLAN_AUTH_OPEN:
2327         case WLAN_AUTH_LEAP:
2328         case WLAN_AUTH_FT:
2329         case WLAN_AUTH_SAE:
2330                 break;
2331         case WLAN_AUTH_SHARED_KEY:
2332                 if (ifmgd->auth_data->expected_transaction != 4) {
2333                         ieee80211_auth_challenge(sdata, mgmt, len);
2334                         /* need another frame */
2335                         return RX_MGMT_NONE;
2336                 }
2337                 break;
2338         default:
2339                 WARN_ONCE(1, "invalid auth alg %d",
2340                           ifmgd->auth_data->algorithm);
2341                 return RX_MGMT_NONE;
2342         }
2343
2344         sdata_info(sdata, "authenticated\n");
2345         ifmgd->auth_data->done = true;
2346         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2347         ifmgd->auth_data->timeout_started = true;
2348         run_again(ifmgd, ifmgd->auth_data->timeout);
2349
2350         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2351             ifmgd->auth_data->expected_transaction != 2) {
2352                 /*
2353                  * Report auth frame to user space for processing since another
2354                  * round of Authentication frames is still needed.
2355                  */
2356                 return RX_MGMT_CFG80211_RX_AUTH;
2357         }
2358
2359         /* move station state to auth */
2360         mutex_lock(&sdata->local->sta_mtx);
2361         sta = sta_info_get(sdata, bssid);
2362         if (!sta) {
2363                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2364                 goto out_err;
2365         }
2366         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2367                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2368                 goto out_err;
2369         }
2370         mutex_unlock(&sdata->local->sta_mtx);
2371
2372         return RX_MGMT_CFG80211_RX_AUTH;
2373  out_err:
2374         mutex_unlock(&sdata->local->sta_mtx);
2375         /* ignore frame -- wait for timeout */
2376         return RX_MGMT_NONE;
2377 }
2378
2379
2380 static enum rx_mgmt_action __must_check
2381 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2382                          struct ieee80211_mgmt *mgmt, size_t len)
2383 {
2384         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2385         const u8 *bssid = NULL;
2386         u16 reason_code;
2387
2388         lockdep_assert_held(&ifmgd->mtx);
2389
2390         if (len < 24 + 2)
2391                 return RX_MGMT_NONE;
2392
2393         if (!ifmgd->associated ||
2394             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2395                 return RX_MGMT_NONE;
2396
2397         bssid = ifmgd->associated->bssid;
2398
2399         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2400
2401         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2402                    bssid, reason_code);
2403
2404         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2405
2406         return RX_MGMT_CFG80211_DEAUTH;
2407 }
2408
2409
2410 static enum rx_mgmt_action __must_check
2411 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2412                            struct ieee80211_mgmt *mgmt, size_t len)
2413 {
2414         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2415         u16 reason_code;
2416
2417         lockdep_assert_held(&ifmgd->mtx);
2418
2419         if (len < 24 + 2)
2420                 return RX_MGMT_NONE;
2421
2422         if (!ifmgd->associated ||
2423             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2424                 return RX_MGMT_NONE;
2425
2426         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2427
2428         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2429                    mgmt->sa, reason_code);
2430
2431         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2432
2433         return RX_MGMT_CFG80211_DISASSOC;
2434 }
2435
2436 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2437                                 u8 *supp_rates, unsigned int supp_rates_len,
2438                                 u32 *rates, u32 *basic_rates,
2439                                 bool *have_higher_than_11mbit,
2440                                 int *min_rate, int *min_rate_index)
2441 {
2442         int i, j;
2443
2444         for (i = 0; i < supp_rates_len; i++) {
2445                 int rate = (supp_rates[i] & 0x7f) * 5;
2446                 bool is_basic = !!(supp_rates[i] & 0x80);
2447
2448                 if (rate > 110)
2449                         *have_higher_than_11mbit = true;
2450
2451                 /*
2452                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2453                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2454                  *
2455                  * Note: Even through the membership selector and the basic
2456                  *       rate flag share the same bit, they are not exactly
2457                  *       the same.
2458                  */
2459                 if (!!(supp_rates[i] & 0x80) &&
2460                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2461                         continue;
2462
2463                 for (j = 0; j < sband->n_bitrates; j++) {
2464                         if (sband->bitrates[j].bitrate == rate) {
2465                                 *rates |= BIT(j);
2466                                 if (is_basic)
2467                                         *basic_rates |= BIT(j);
2468                                 if (rate < *min_rate) {
2469                                         *min_rate = rate;
2470                                         *min_rate_index = j;
2471                                 }
2472                                 break;
2473                         }
2474                 }
2475         }
2476 }
2477
2478 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2479                                          bool assoc)
2480 {
2481         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2482
2483         lockdep_assert_held(&sdata->u.mgd.mtx);
2484
2485         if (!assoc) {
2486                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2487
2488                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2489                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2490                 sdata->u.mgd.flags = 0;
2491                 ieee80211_vif_release_channel(sdata);
2492         }
2493
2494         kfree(assoc_data);
2495         sdata->u.mgd.assoc_data = NULL;
2496 }
2497
2498 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2499                                     struct cfg80211_bss *cbss,
2500                                     struct ieee80211_mgmt *mgmt, size_t len)
2501 {
2502         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2503         struct ieee80211_local *local = sdata->local;
2504         struct ieee80211_supported_band *sband;
2505         struct sta_info *sta;
2506         u8 *pos;
2507         u16 capab_info, aid;
2508         struct ieee802_11_elems elems;
2509         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2510         u32 changed = 0;
2511         int err;
2512
2513         /* AssocResp and ReassocResp have identical structure */
2514
2515         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2516         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2517
2518         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2519                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2520                            aid);
2521         aid &= ~(BIT(15) | BIT(14));
2522
2523         ifmgd->broken_ap = false;
2524
2525         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2526                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2527                            aid);
2528                 aid = 0;
2529                 ifmgd->broken_ap = true;
2530         }
2531
2532         pos = mgmt->u.assoc_resp.variable;
2533         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2534
2535         if (!elems.supp_rates) {
2536                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2537                 return false;
2538         }
2539
2540         ifmgd->aid = aid;
2541
2542         /*
2543          * We previously checked these in the beacon/probe response, so
2544          * they should be present here. This is just a safety net.
2545          */
2546         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2547             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2548                 sdata_info(sdata,
2549                            "HT AP is missing WMM params or HT capability/operation in AssocResp\n");
2550                 return false;
2551         }
2552
2553         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2554             (!elems.vht_cap_elem || !elems.vht_operation)) {
2555                 sdata_info(sdata,
2556                            "VHT AP is missing VHT capability/operation in AssocResp\n");
2557                 return false;
2558         }
2559
2560         mutex_lock(&sdata->local->sta_mtx);
2561         /*
2562          * station info was already allocated and inserted before
2563          * the association and should be available to us
2564          */
2565         sta = sta_info_get(sdata, cbss->bssid);
2566         if (WARN_ON(!sta)) {
2567                 mutex_unlock(&sdata->local->sta_mtx);
2568                 return false;
2569         }
2570
2571         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2572
2573         /* Set up internal HT/VHT capabilities */
2574         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2575                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2576                                                   elems.ht_cap_elem, sta);
2577
2578         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2579                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2580                                                     elems.vht_cap_elem, sta);
2581
2582         /*
2583          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2584          * in their association response, so ignore that data for our own
2585          * configuration. If it changed since the last beacon, we'll get the
2586          * next beacon and update then.
2587          */
2588
2589         /*
2590          * If an operating mode notification IE is present, override the
2591          * NSS calculation (that would be done in rate_control_rate_init())
2592          * and use the # of streams from that element.
2593          */
2594         if (elems.opmode_notif &&
2595             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2596                 u8 nss;
2597
2598                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2599                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2600                 nss += 1;
2601                 sta->sta.rx_nss = nss;
2602         }
2603
2604         rate_control_rate_init(sta);
2605
2606         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2607                 set_sta_flag(sta, WLAN_STA_MFP);
2608
2609         if (elems.wmm_param)
2610                 set_sta_flag(sta, WLAN_STA_WME);
2611
2612         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2613         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2614                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2615         if (err) {
2616                 sdata_info(sdata,
2617                            "failed to move station %pM to desired state\n",
2618                            sta->sta.addr);
2619                 WARN_ON(__sta_info_destroy(sta));
2620                 mutex_unlock(&sdata->local->sta_mtx);
2621                 return false;
2622         }
2623
2624         mutex_unlock(&sdata->local->sta_mtx);
2625
2626         /*
2627          * Always handle WMM once after association regardless
2628          * of the first value the AP uses. Setting -1 here has
2629          * that effect because the AP values is an unsigned
2630          * 4-bit value.
2631          */
2632         ifmgd->wmm_last_param_set = -1;
2633
2634         if (elems.wmm_param)
2635                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2636                                          elems.wmm_param_len);
2637         else
2638                 ieee80211_set_wmm_default(sdata, false);
2639         changed |= BSS_CHANGED_QOS;
2640
2641         /* set AID and assoc capability,
2642          * ieee80211_set_associated() will tell the driver */
2643         bss_conf->aid = aid;
2644         bss_conf->assoc_capability = capab_info;
2645         ieee80211_set_associated(sdata, cbss, changed);
2646
2647         /*
2648          * If we're using 4-addr mode, let the AP know that we're
2649          * doing so, so that it can create the STA VLAN on its side
2650          */
2651         if (ifmgd->use_4addr)
2652                 ieee80211_send_4addr_nullfunc(local, sdata);
2653
2654         /*
2655          * Start timer to probe the connection to the AP now.
2656          * Also start the timer that will detect beacon loss.
2657          */
2658         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2659         ieee80211_sta_reset_beacon_monitor(sdata);
2660
2661         return true;
2662 }
2663
2664 static enum rx_mgmt_action __must_check
2665 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2666                              struct ieee80211_mgmt *mgmt, size_t len,
2667                              struct cfg80211_bss **bss)
2668 {
2669         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2670         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2671         u16 capab_info, status_code, aid;
2672         struct ieee802_11_elems elems;
2673         u8 *pos;
2674         bool reassoc;
2675
2676         lockdep_assert_held(&ifmgd->mtx);
2677
2678         if (!assoc_data)
2679                 return RX_MGMT_NONE;
2680         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2681                 return RX_MGMT_NONE;
2682
2683         /*
2684          * AssocResp and ReassocResp have identical structure, so process both
2685          * of them in this function.
2686          */
2687
2688         if (len < 24 + 6)
2689                 return RX_MGMT_NONE;
2690
2691         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2692         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2693         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2694         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2695
2696         sdata_info(sdata,
2697                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2698                    reassoc ? "Rea" : "A", mgmt->sa,
2699                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2700
2701         pos = mgmt->u.assoc_resp.variable;
2702         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2703
2704         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2705             elems.timeout_int &&
2706             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2707                 u32 tu, ms;
2708                 tu = le32_to_cpu(elems.timeout_int->value);
2709                 ms = tu * 1024 / 1000;
2710                 sdata_info(sdata,
2711                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2712                            mgmt->sa, tu, ms);
2713                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2714                 assoc_data->timeout_started = true;
2715                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2716                         run_again(ifmgd, assoc_data->timeout);
2717                 return RX_MGMT_NONE;
2718         }
2719
2720         *bss = assoc_data->bss;
2721
2722         if (status_code != WLAN_STATUS_SUCCESS) {
2723                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2724                            mgmt->sa, status_code);
2725                 ieee80211_destroy_assoc_data(sdata, false);
2726         } else {
2727                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2728                         /* oops -- internal error -- send timeout for now */
2729                         ieee80211_destroy_assoc_data(sdata, false);
2730                         cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
2731                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2732                 }
2733                 sdata_info(sdata, "associated\n");
2734
2735                 /*
2736                  * destroy assoc_data afterwards, as otherwise an idle
2737                  * recalc after assoc_data is NULL but before associated
2738                  * is set can cause the interface to go idle
2739                  */
2740                 ieee80211_destroy_assoc_data(sdata, true);
2741         }
2742
2743         return RX_MGMT_CFG80211_RX_ASSOC;
2744 }
2745
2746 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2747                                   struct ieee80211_mgmt *mgmt, size_t len,
2748                                   struct ieee80211_rx_status *rx_status,
2749                                   struct ieee802_11_elems *elems)
2750 {
2751         struct ieee80211_local *local = sdata->local;
2752         int freq;
2753         struct ieee80211_bss *bss;
2754         struct ieee80211_channel *channel;
2755         bool need_ps = false;
2756
2757         lockdep_assert_held(&sdata->u.mgd.mtx);
2758
2759         if ((sdata->u.mgd.associated &&
2760              ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2761             (sdata->u.mgd.assoc_data &&
2762              ether_addr_equal(mgmt->bssid,
2763                               sdata->u.mgd.assoc_data->bss->bssid))) {
2764                 /* not previously set so we may need to recalc */
2765                 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2766
2767                 if (elems->tim && !elems->parse_error) {
2768                         const struct ieee80211_tim_ie *tim_ie = elems->tim;
2769                         sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2770                 }
2771         }
2772
2773         if (elems->ds_params)
2774                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2775                                                       rx_status->band);
2776         else
2777                 freq = rx_status->freq;
2778
2779         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2780
2781         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2782                 return;
2783
2784         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2785                                         channel);
2786         if (bss)
2787                 ieee80211_rx_bss_put(local, bss);
2788
2789         if (!sdata->u.mgd.associated ||
2790             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))
2791                 return;
2792
2793         if (need_ps) {
2794                 mutex_lock(&local->iflist_mtx);
2795                 ieee80211_recalc_ps(local, -1);
2796                 mutex_unlock(&local->iflist_mtx);
2797         }
2798
2799         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, elems);
2800
2801 }
2802
2803
2804 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2805                                          struct sk_buff *skb)
2806 {
2807         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2808         struct ieee80211_if_managed *ifmgd;
2809         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2810         size_t baselen, len = skb->len;
2811         struct ieee802_11_elems elems;
2812
2813         ifmgd = &sdata->u.mgd;
2814
2815         ASSERT_MGD_MTX(ifmgd);
2816
2817         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2818                 return; /* ignore ProbeResp to foreign address */
2819
2820         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2821         if (baselen > len)
2822                 return;
2823
2824         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2825                                false, &elems);
2826
2827         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2828
2829         if (ifmgd->associated &&
2830             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2831                 ieee80211_reset_ap_probe(sdata);
2832
2833         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2834             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2835                 /* got probe response, continue with auth */
2836                 sdata_info(sdata, "direct probe responded\n");
2837                 ifmgd->auth_data->tries = 0;
2838                 ifmgd->auth_data->timeout = jiffies;
2839                 ifmgd->auth_data->timeout_started = true;
2840                 run_again(ifmgd, ifmgd->auth_data->timeout);
2841         }
2842 }
2843
2844 /*
2845  * This is the canonical list of information elements we care about,
2846  * the filter code also gives us all changes to the Microsoft OUI
2847  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2848  *
2849  * We implement beacon filtering in software since that means we can
2850  * avoid processing the frame here and in cfg80211, and userspace
2851  * will not be able to tell whether the hardware supports it or not.
2852  *
2853  * XXX: This list needs to be dynamic -- userspace needs to be able to
2854  *      add items it requires. It also needs to be able to tell us to
2855  *      look out for other vendor IEs.
2856  */
2857 static const u64 care_about_ies =
2858         (1ULL << WLAN_EID_COUNTRY) |
2859         (1ULL << WLAN_EID_ERP_INFO) |
2860         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2861         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2862         (1ULL << WLAN_EID_HT_CAPABILITY) |
2863         (1ULL << WLAN_EID_HT_OPERATION);
2864
2865 static enum rx_mgmt_action
2866 ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2867                          struct ieee80211_mgmt *mgmt, size_t len,
2868                          u8 *deauth_buf, struct ieee80211_rx_status *rx_status)
2869 {
2870         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2871         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2872         size_t baselen;
2873         struct ieee802_11_elems elems;
2874         struct ieee80211_local *local = sdata->local;
2875         struct ieee80211_chanctx_conf *chanctx_conf;
2876         struct ieee80211_channel *chan;
2877         struct sta_info *sta;
2878         u32 changed = 0;
2879         bool erp_valid;
2880         u8 erp_value = 0;
2881         u32 ncrc;
2882         u8 *bssid;
2883
2884         lockdep_assert_held(&ifmgd->mtx);
2885
2886         /* Process beacon from the current BSS */
2887         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2888         if (baselen > len)
2889                 return RX_MGMT_NONE;
2890
2891         rcu_read_lock();
2892         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2893         if (!chanctx_conf) {
2894                 rcu_read_unlock();
2895                 return RX_MGMT_NONE;
2896         }
2897
2898         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2899                 rcu_read_unlock();
2900                 return RX_MGMT_NONE;
2901         }
2902         chan = chanctx_conf->def.chan;
2903         rcu_read_unlock();
2904
2905         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2906             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2907                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2908                                        len - baselen, false, &elems);
2909
2910                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2911                 ifmgd->assoc_data->have_beacon = true;
2912                 ifmgd->assoc_data->need_beacon = false;
2913                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2914                         sdata->vif.bss_conf.sync_tsf =
2915                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2916                         sdata->vif.bss_conf.sync_device_ts =
2917                                 rx_status->device_timestamp;
2918                         if (elems.tim)
2919                                 sdata->vif.bss_conf.sync_dtim_count =
2920                                         elems.tim->dtim_count;
2921                         else
2922                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2923                 }
2924                 /* continue assoc process */
2925                 ifmgd->assoc_data->timeout = jiffies;
2926                 ifmgd->assoc_data->timeout_started = true;
2927                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2928                 return RX_MGMT_NONE;
2929         }
2930
2931         if (!ifmgd->associated ||
2932             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2933                 return RX_MGMT_NONE;
2934         bssid = ifmgd->associated->bssid;
2935
2936         /* Track average RSSI from the Beacon frames of the current AP */
2937         ifmgd->last_beacon_signal = rx_status->signal;
2938         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2939                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2940                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2941                 ifmgd->last_cqm_event_signal = 0;
2942                 ifmgd->count_beacon_signal = 1;
2943                 ifmgd->last_ave_beacon_signal = 0;
2944         } else {
2945                 ifmgd->ave_beacon_signal =
2946                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2947                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2948                          ifmgd->ave_beacon_signal) / 16;
2949                 ifmgd->count_beacon_signal++;
2950         }
2951
2952         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2953             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2954                 int sig = ifmgd->ave_beacon_signal;
2955                 int last_sig = ifmgd->last_ave_beacon_signal;
2956
2957                 /*
2958                  * if signal crosses either of the boundaries, invoke callback
2959                  * with appropriate parameters
2960                  */
2961                 if (sig > ifmgd->rssi_max_thold &&
2962                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2963                         ifmgd->last_ave_beacon_signal = sig;
2964                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2965                 } else if (sig < ifmgd->rssi_min_thold &&
2966                            (last_sig >= ifmgd->rssi_max_thold ||
2967                            last_sig == 0)) {
2968                         ifmgd->last_ave_beacon_signal = sig;
2969                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2970                 }
2971         }
2972
2973         if (bss_conf->cqm_rssi_thold &&
2974             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2975             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2976                 int sig = ifmgd->ave_beacon_signal / 16;
2977                 int last_event = ifmgd->last_cqm_event_signal;
2978                 int thold = bss_conf->cqm_rssi_thold;
2979                 int hyst = bss_conf->cqm_rssi_hyst;
2980                 if (sig < thold &&
2981                     (last_event == 0 || sig < last_event - hyst)) {
2982                         ifmgd->last_cqm_event_signal = sig;
2983                         ieee80211_cqm_rssi_notify(
2984                                 &sdata->vif,
2985                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2986                                 GFP_KERNEL);
2987                 } else if (sig > thold &&
2988                            (last_event == 0 || sig > last_event + hyst)) {
2989                         ifmgd->last_cqm_event_signal = sig;
2990                         ieee80211_cqm_rssi_notify(
2991                                 &sdata->vif,
2992                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2993                                 GFP_KERNEL);
2994                 }
2995         }
2996
2997         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2998                 mlme_dbg_ratelimited(sdata,
2999                                      "cancelling AP probe due to a received beacon\n");
3000                 mutex_lock(&local->mtx);
3001                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
3002                 ieee80211_run_deferred_scan(local);
3003                 mutex_unlock(&local->mtx);
3004
3005                 mutex_lock(&local->iflist_mtx);
3006                 ieee80211_recalc_ps(local, -1);
3007                 mutex_unlock(&local->iflist_mtx);
3008         }
3009
3010         /*
3011          * Push the beacon loss detection into the future since
3012          * we are processing a beacon from the AP just now.
3013          */
3014         ieee80211_sta_reset_beacon_monitor(sdata);
3015
3016         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3017         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3018                                           len - baselen, false, &elems,
3019                                           care_about_ies, ncrc);
3020
3021         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3022                 bool directed_tim = ieee80211_check_tim(elems.tim,
3023                                                         elems.tim_len,
3024                                                         ifmgd->aid);
3025                 if (directed_tim) {
3026                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3027                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3028                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3029                                         ieee80211_hw_config(local,
3030                                                             IEEE80211_CONF_CHANGE_PS);
3031                                 }
3032                                 ieee80211_send_nullfunc(local, sdata, 0);
3033                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3034                                 local->pspolling = true;
3035
3036                                 /*
3037                                  * Here is assumed that the driver will be
3038                                  * able to send ps-poll frame and receive a
3039                                  * response even though power save mode is
3040                                  * enabled, but some drivers might require
3041                                  * to disable power save here. This needs
3042                                  * to be investigated.
3043                                  */
3044                                 ieee80211_send_pspoll(local, sdata);
3045                         }
3046                 }
3047         }
3048
3049         if (sdata->vif.p2p) {
3050                 struct ieee80211_p2p_noa_attr noa = {};
3051                 int ret;
3052
3053                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3054                                             len - baselen,
3055                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3056                                             (u8 *) &noa, sizeof(noa));
3057                 if (ret >= 2) {
3058                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3059                                 /* valid noa_attr and index changed */
3060                                 sdata->u.mgd.p2p_noa_index = noa.index;
3061                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3062                                 changed |= BSS_CHANGED_P2P_PS;
3063                                 /*
3064                                  * make sure we update all information, the CRC
3065                                  * mechanism doesn't look at P2P attributes.
3066                                  */
3067                                 ifmgd->beacon_crc_valid = false;
3068                         }
3069                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3070                         /* noa_attr not found and we had valid noa_attr before */
3071                         sdata->u.mgd.p2p_noa_index = -1;
3072                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3073                         changed |= BSS_CHANGED_P2P_PS;
3074                         ifmgd->beacon_crc_valid = false;
3075                 }
3076         }
3077
3078         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3079                 return RX_MGMT_NONE;
3080         ifmgd->beacon_crc = ncrc;
3081         ifmgd->beacon_crc_valid = true;
3082
3083         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3084
3085         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3086                                      elems.wmm_param_len))
3087                 changed |= BSS_CHANGED_QOS;
3088
3089         /*
3090          * If we haven't had a beacon before, tell the driver about the
3091          * DTIM period (and beacon timing if desired) now.
3092          */
3093         if (!bss_conf->dtim_period) {
3094                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3095                 if (elems.tim)
3096                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3097                 else
3098                         bss_conf->dtim_period = 1;
3099
3100                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3101                         sdata->vif.bss_conf.sync_tsf =
3102                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3103                         sdata->vif.bss_conf.sync_device_ts =
3104                                 rx_status->device_timestamp;
3105                         if (elems.tim)
3106                                 sdata->vif.bss_conf.sync_dtim_count =
3107                                         elems.tim->dtim_count;
3108                         else
3109                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3110                 }
3111
3112                 changed |= BSS_CHANGED_DTIM_PERIOD;
3113         }
3114
3115         if (elems.erp_info) {
3116                 erp_valid = true;
3117                 erp_value = elems.erp_info[0];
3118         } else {
3119                 erp_valid = false;
3120         }
3121         changed |= ieee80211_handle_bss_capability(sdata,
3122                         le16_to_cpu(mgmt->u.beacon.capab_info),
3123                         erp_valid, erp_value);
3124
3125         mutex_lock(&local->sta_mtx);
3126         sta = sta_info_get(sdata, bssid);
3127
3128         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3129                                 elems.vht_operation, bssid, &changed)) {
3130                 mutex_unlock(&local->sta_mtx);
3131                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3132                                        WLAN_REASON_DEAUTH_LEAVING,
3133                                        true, deauth_buf);
3134                 return RX_MGMT_CFG80211_TX_DEAUTH;
3135         }
3136
3137         if (sta && elems.opmode_notif)
3138                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3139                                             rx_status->band, true);
3140         mutex_unlock(&local->sta_mtx);
3141
3142         if (elems.country_elem && elems.pwr_constr_elem &&
3143             mgmt->u.probe_resp.capab_info &
3144                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3145                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3146                                                        elems.country_elem,
3147                                                        elems.country_elem_len,
3148                                                        elems.pwr_constr_elem);
3149
3150         ieee80211_bss_info_change_notify(sdata, changed);
3151
3152         return RX_MGMT_NONE;
3153 }
3154
3155 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3156                                   struct sk_buff *skb)
3157 {
3158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3159         struct ieee80211_rx_status *rx_status;
3160         struct ieee80211_mgmt *mgmt;
3161         struct cfg80211_bss *bss = NULL;
3162         enum rx_mgmt_action rma = RX_MGMT_NONE;
3163         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3164         u16 fc;
3165         struct ieee802_11_elems elems;
3166         int ies_len;
3167
3168         rx_status = (struct ieee80211_rx_status *) skb->cb;
3169         mgmt = (struct ieee80211_mgmt *) skb->data;
3170         fc = le16_to_cpu(mgmt->frame_control);
3171
3172         mutex_lock(&ifmgd->mtx);
3173
3174         switch (fc & IEEE80211_FCTL_STYPE) {
3175         case IEEE80211_STYPE_BEACON:
3176                 rma = ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
3177                                                deauth_buf, rx_status);
3178                 break;
3179         case IEEE80211_STYPE_PROBE_RESP:
3180                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3181                 break;
3182         case IEEE80211_STYPE_AUTH:
3183                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3184                 break;
3185         case IEEE80211_STYPE_DEAUTH:
3186                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3187                 break;
3188         case IEEE80211_STYPE_DISASSOC:
3189                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3190                 break;
3191         case IEEE80211_STYPE_ASSOC_RESP:
3192         case IEEE80211_STYPE_REASSOC_RESP:
3193                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
3194                 break;
3195         case IEEE80211_STYPE_ACTION:
3196                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3197                         ies_len = skb->len -
3198                                   offsetof(struct ieee80211_mgmt,
3199                                            u.action.u.chan_switch.variable);
3200
3201                         if (ies_len < 0)
3202                                 break;
3203
3204                         ieee802_11_parse_elems(
3205                                 mgmt->u.action.u.chan_switch.variable,
3206                                 ies_len, true, &elems);
3207
3208                         if (elems.parse_error)
3209                                 break;
3210
3211                         ieee80211_sta_process_chanswitch(sdata,
3212                                                          rx_status->mactime,
3213                                                          &elems);
3214                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3215                         ies_len = skb->len -
3216                                   offsetof(struct ieee80211_mgmt,
3217                                            u.action.u.ext_chan_switch.variable);
3218
3219                         if (ies_len < 0)
3220                                 break;
3221
3222                         ieee802_11_parse_elems(
3223                                 mgmt->u.action.u.ext_chan_switch.variable,
3224                                 ies_len, true, &elems);
3225
3226                         if (elems.parse_error)
3227                                 break;
3228
3229                         /* for the handling code pretend this was also an IE */
3230                         elems.ext_chansw_ie =
3231                                 &mgmt->u.action.u.ext_chan_switch.data;
3232
3233                         ieee80211_sta_process_chanswitch(sdata,
3234                                                          rx_status->mactime,
3235                                                          &elems);
3236                 }
3237                 break;
3238         }
3239         mutex_unlock(&ifmgd->mtx);
3240
3241         switch (rma) {
3242         case RX_MGMT_NONE:
3243                 /* no action */
3244                 break;
3245         case RX_MGMT_CFG80211_DEAUTH:
3246                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
3247                 break;
3248         case RX_MGMT_CFG80211_DISASSOC:
3249                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
3250                 break;
3251         case RX_MGMT_CFG80211_RX_AUTH:
3252                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
3253                 break;
3254         case RX_MGMT_CFG80211_RX_ASSOC:
3255                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
3256                 break;
3257         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
3258                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
3259                 break;
3260         case RX_MGMT_CFG80211_TX_DEAUTH:
3261                 cfg80211_send_deauth(sdata->dev, deauth_buf,
3262                                      sizeof(deauth_buf));
3263                 break;
3264         default:
3265                 WARN(1, "unexpected: %d", rma);
3266         }
3267 }
3268
3269 static void ieee80211_sta_timer(unsigned long data)
3270 {
3271         struct ieee80211_sub_if_data *sdata =
3272                 (struct ieee80211_sub_if_data *) data;
3273
3274         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3275 }
3276
3277 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3278                                           u8 *bssid, u8 reason, bool tx)
3279 {
3280         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3281         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3282
3283         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3284                                tx, frame_buf);
3285         mutex_unlock(&ifmgd->mtx);
3286
3287         /*
3288          * must be outside lock due to cfg80211,
3289          * but that's not a problem.
3290          */
3291         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
3292
3293         mutex_lock(&ifmgd->mtx);
3294 }
3295
3296 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3297 {
3298         struct ieee80211_local *local = sdata->local;
3299         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3300         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3301         u32 tx_flags = 0;
3302
3303         lockdep_assert_held(&ifmgd->mtx);
3304
3305         if (WARN_ON_ONCE(!auth_data))
3306                 return -EINVAL;
3307
3308         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3309                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3310                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3311
3312         auth_data->tries++;
3313
3314         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3315                 sdata_info(sdata, "authentication with %pM timed out\n",
3316                            auth_data->bss->bssid);
3317
3318                 /*
3319                  * Most likely AP is not in the range so remove the
3320                  * bss struct for that AP.
3321                  */
3322                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3323
3324                 return -ETIMEDOUT;
3325         }
3326
3327         drv_mgd_prepare_tx(local, sdata);
3328
3329         if (auth_data->bss->proberesp_ies) {
3330                 u16 trans = 1;
3331                 u16 status = 0;
3332
3333                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3334                            auth_data->bss->bssid, auth_data->tries,
3335                            IEEE80211_AUTH_MAX_TRIES);
3336
3337                 auth_data->expected_transaction = 2;
3338
3339                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3340                         trans = auth_data->sae_trans;
3341                         status = auth_data->sae_status;
3342                         auth_data->expected_transaction = trans;
3343                 }
3344
3345                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3346                                     auth_data->data, auth_data->data_len,
3347                                     auth_data->bss->bssid,
3348                                     auth_data->bss->bssid, NULL, 0, 0,
3349                                     tx_flags);
3350         } else {
3351                 const u8 *ssidie;
3352
3353                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3354                            auth_data->bss->bssid, auth_data->tries,
3355                            IEEE80211_AUTH_MAX_TRIES);
3356
3357                 rcu_read_lock();
3358                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3359                 if (!ssidie) {
3360                         rcu_read_unlock();
3361                         return -EINVAL;
3362                 }
3363                 /*
3364                  * Direct probe is sent to broadcast address as some APs
3365                  * will not answer to direct packet in unassociated state.
3366                  */
3367                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3368                                          NULL, 0, (u32) -1, true, tx_flags,
3369                                          auth_data->bss->channel, false);
3370                 rcu_read_unlock();
3371         }
3372
3373         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3374                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3375                 ifmgd->auth_data->timeout_started = true;
3376                 run_again(ifmgd, auth_data->timeout);
3377         } else {
3378                 auth_data->timeout_started = false;
3379         }
3380
3381         return 0;
3382 }
3383
3384 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3385 {
3386         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3387         struct ieee80211_local *local = sdata->local;
3388
3389         lockdep_assert_held(&sdata->u.mgd.mtx);
3390
3391         assoc_data->tries++;
3392         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3393                 sdata_info(sdata, "association with %pM timed out\n",
3394                            assoc_data->bss->bssid);
3395
3396                 /*
3397                  * Most likely AP is not in the range so remove the
3398                  * bss struct for that AP.
3399                  */
3400                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3401
3402                 return -ETIMEDOUT;
3403         }
3404
3405         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3406                    assoc_data->bss->bssid, assoc_data->tries,
3407                    IEEE80211_ASSOC_MAX_TRIES);
3408         ieee80211_send_assoc(sdata);
3409
3410         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3411                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3412                 assoc_data->timeout_started = true;
3413                 run_again(&sdata->u.mgd, assoc_data->timeout);
3414         } else {
3415                 assoc_data->timeout_started = false;
3416         }
3417
3418         return 0;
3419 }
3420
3421 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3422                                   __le16 fc, bool acked)
3423 {
3424         struct ieee80211_local *local = sdata->local;
3425
3426         sdata->u.mgd.status_fc = fc;
3427         sdata->u.mgd.status_acked = acked;
3428         sdata->u.mgd.status_received = true;
3429
3430         ieee80211_queue_work(&local->hw, &sdata->work);
3431 }
3432
3433 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3434 {
3435         struct ieee80211_local *local = sdata->local;
3436         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3437
3438         mutex_lock(&ifmgd->mtx);
3439
3440         if (ifmgd->status_received) {
3441                 __le16 fc = ifmgd->status_fc;
3442                 bool status_acked = ifmgd->status_acked;
3443
3444                 ifmgd->status_received = false;
3445                 if (ifmgd->auth_data &&
3446                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3447                         if (status_acked) {
3448                                 ifmgd->auth_data->timeout =
3449                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3450                                 run_again(ifmgd, ifmgd->auth_data->timeout);
3451                         } else {
3452                                 ifmgd->auth_data->timeout = jiffies - 1;
3453                         }
3454                         ifmgd->auth_data->timeout_started = true;
3455                 } else if (ifmgd->assoc_data &&
3456                            (ieee80211_is_assoc_req(fc) ||
3457                             ieee80211_is_reassoc_req(fc))) {
3458                         if (status_acked) {
3459                                 ifmgd->assoc_data->timeout =
3460                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3461                                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3462                         } else {
3463                                 ifmgd->assoc_data->timeout = jiffies - 1;
3464                         }
3465                         ifmgd->assoc_data->timeout_started = true;
3466                 }
3467         }
3468
3469         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3470             time_after(jiffies, ifmgd->auth_data->timeout)) {
3471                 if (ifmgd->auth_data->done) {
3472                         /*
3473                          * ok ... we waited for assoc but userspace didn't,
3474                          * so let's just kill the auth data
3475                          */
3476                         ieee80211_destroy_auth_data(sdata, false);
3477                 } else if (ieee80211_probe_auth(sdata)) {
3478                         u8 bssid[ETH_ALEN];
3479
3480                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3481
3482                         ieee80211_destroy_auth_data(sdata, false);
3483
3484                         mutex_unlock(&ifmgd->mtx);
3485                         cfg80211_send_auth_timeout(sdata->dev, bssid);
3486                         mutex_lock(&ifmgd->mtx);
3487                 }
3488         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3489                 run_again(ifmgd, ifmgd->auth_data->timeout);
3490
3491         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3492             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3493                 if ((ifmgd->assoc_data->need_beacon &&
3494                      !ifmgd->assoc_data->have_beacon) ||
3495                     ieee80211_do_assoc(sdata)) {
3496                         u8 bssid[ETH_ALEN];
3497
3498                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
3499
3500                         ieee80211_destroy_assoc_data(sdata, false);
3501
3502                         mutex_unlock(&ifmgd->mtx);
3503                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
3504                         mutex_lock(&ifmgd->mtx);
3505                 }
3506         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3507                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3508
3509         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3510                             IEEE80211_STA_CONNECTION_POLL) &&
3511             ifmgd->associated) {
3512                 u8 bssid[ETH_ALEN];
3513                 int max_tries;
3514
3515                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3516
3517                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3518                         max_tries = max_nullfunc_tries;
3519                 else
3520                         max_tries = max_probe_tries;
3521
3522                 /* ACK received for nullfunc probing frame */
3523                 if (!ifmgd->probe_send_count)
3524                         ieee80211_reset_ap_probe(sdata);
3525                 else if (ifmgd->nullfunc_failed) {
3526                         if (ifmgd->probe_send_count < max_tries) {
3527                                 mlme_dbg(sdata,
3528                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3529                                          bssid, ifmgd->probe_send_count,
3530                                          max_tries);
3531                                 ieee80211_mgd_probe_ap_send(sdata);
3532                         } else {
3533                                 mlme_dbg(sdata,
3534                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3535                                          bssid);
3536                                 ieee80211_sta_connection_lost(sdata, bssid,
3537                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3538                                         false);
3539                         }
3540                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3541                         run_again(ifmgd, ifmgd->probe_timeout);
3542                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3543                         mlme_dbg(sdata,
3544                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3545                                  bssid, probe_wait_ms);
3546                         ieee80211_sta_connection_lost(sdata, bssid,
3547                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3548                 } else if (ifmgd->probe_send_count < max_tries) {
3549                         mlme_dbg(sdata,
3550                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3551                                  bssid, probe_wait_ms,
3552                                  ifmgd->probe_send_count, max_tries);
3553                         ieee80211_mgd_probe_ap_send(sdata);
3554                 } else {
3555                         /*
3556                          * We actually lost the connection ... or did we?
3557                          * Let's make sure!
3558                          */
3559                         wiphy_debug(local->hw.wiphy,
3560                                     "%s: No probe response from AP %pM"
3561                                     " after %dms, disconnecting.\n",
3562                                     sdata->name,
3563                                     bssid, probe_wait_ms);
3564
3565                         ieee80211_sta_connection_lost(sdata, bssid,
3566                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3567                 }
3568         }
3569
3570         mutex_unlock(&ifmgd->mtx);
3571 }
3572
3573 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3574 {
3575         struct ieee80211_sub_if_data *sdata =
3576                 (struct ieee80211_sub_if_data *) data;
3577         struct ieee80211_local *local = sdata->local;
3578
3579         if (local->quiescing)
3580                 return;
3581
3582         sdata->u.mgd.connection_loss = false;
3583         ieee80211_queue_work(&sdata->local->hw,
3584                              &sdata->u.mgd.beacon_connection_loss_work);
3585 }
3586
3587 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3588 {
3589         struct ieee80211_sub_if_data *sdata =
3590                 (struct ieee80211_sub_if_data *) data;
3591         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3592         struct ieee80211_local *local = sdata->local;
3593
3594         if (local->quiescing)
3595                 return;
3596
3597         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3598 }
3599
3600 static void ieee80211_sta_monitor_work(struct work_struct *work)
3601 {
3602         struct ieee80211_sub_if_data *sdata =
3603                 container_of(work, struct ieee80211_sub_if_data,
3604                              u.mgd.monitor_work);
3605
3606         ieee80211_mgd_probe_ap(sdata, false);
3607 }
3608
3609 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3610 {
3611         u32 flags;
3612
3613         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3614                 __ieee80211_stop_poll(sdata);
3615
3616                 /* let's probe the connection once */
3617                 flags = sdata->local->hw.flags;
3618                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3619                         ieee80211_queue_work(&sdata->local->hw,
3620                                              &sdata->u.mgd.monitor_work);
3621                 /* and do all the other regular work too */
3622                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3623         }
3624 }
3625
3626 /* interface setup */
3627 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3628 {
3629         struct ieee80211_if_managed *ifmgd;
3630
3631         ifmgd = &sdata->u.mgd;
3632         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3633         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3634         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3635                   ieee80211_beacon_connection_loss_work);
3636         INIT_WORK(&ifmgd->csa_connection_drop_work,
3637                   ieee80211_csa_connection_drop_work);
3638         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3639         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3640                     (unsigned long) sdata);
3641         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3642                     (unsigned long) sdata);
3643         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3644                     (unsigned long) sdata);
3645         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3646                     (unsigned long) sdata);
3647
3648         ifmgd->flags = 0;
3649         ifmgd->powersave = sdata->wdev.ps;
3650         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3651         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3652         ifmgd->p2p_noa_index = -1;
3653
3654         mutex_init(&ifmgd->mtx);
3655
3656         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3657                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3658         else
3659                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3660 }
3661
3662 /* scan finished notification */
3663 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3664 {
3665         struct ieee80211_sub_if_data *sdata;
3666
3667         /* Restart STA timers */
3668         rcu_read_lock();
3669         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3670                 ieee80211_restart_sta_timer(sdata);
3671         rcu_read_unlock();
3672 }
3673
3674 int ieee80211_max_network_latency(struct notifier_block *nb,
3675                                   unsigned long data, void *dummy)
3676 {
3677         s32 latency_usec = (s32) data;
3678         struct ieee80211_local *local =
3679                 container_of(nb, struct ieee80211_local,
3680                              network_latency_notifier);
3681
3682         mutex_lock(&local->iflist_mtx);
3683         ieee80211_recalc_ps(local, latency_usec);
3684         mutex_unlock(&local->iflist_mtx);
3685
3686         return 0;
3687 }
3688
3689 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3690                                      struct cfg80211_bss *cbss)
3691 {
3692         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3693         const u8 *ht_cap_ie, *vht_cap_ie;
3694         const struct ieee80211_ht_cap *ht_cap;
3695         const struct ieee80211_vht_cap *vht_cap;
3696         u8 chains = 1;
3697
3698         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3699                 return chains;
3700
3701         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3702         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3703                 ht_cap = (void *)(ht_cap_ie + 2);
3704                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3705                 /*
3706                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3707                  *       "Tx Unequal Modulation Supported" fields.
3708                  */
3709         }
3710
3711         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3712                 return chains;
3713
3714         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3715         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3716                 u8 nss;
3717                 u16 tx_mcs_map;
3718
3719                 vht_cap = (void *)(vht_cap_ie + 2);
3720                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3721                 for (nss = 8; nss > 0; nss--) {
3722                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3723                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3724                                 break;
3725                 }
3726                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3727                 chains = max(chains, nss);
3728         }
3729
3730         return chains;
3731 }
3732
3733 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3734                                   struct cfg80211_bss *cbss)
3735 {
3736         struct ieee80211_local *local = sdata->local;
3737         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3738         const struct ieee80211_ht_operation *ht_oper = NULL;
3739         const struct ieee80211_vht_operation *vht_oper = NULL;
3740         struct ieee80211_supported_band *sband;
3741         struct cfg80211_chan_def chandef;
3742         int ret;
3743
3744         sband = local->hw.wiphy->bands[cbss->channel->band];
3745
3746         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3747                           IEEE80211_STA_DISABLE_80P80MHZ |
3748                           IEEE80211_STA_DISABLE_160MHZ);
3749
3750         rcu_read_lock();
3751
3752         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3753             sband->ht_cap.ht_supported) {
3754                 const u8 *ht_oper_ie, *ht_cap;
3755
3756                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3757                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3758                         ht_oper = (void *)(ht_oper_ie + 2);
3759
3760                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3761                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3762                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3763                         ht_oper = NULL;
3764                 }
3765         }
3766
3767         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3768             sband->vht_cap.vht_supported) {
3769                 const u8 *vht_oper_ie, *vht_cap;
3770
3771                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3772                                                    WLAN_EID_VHT_OPERATION);
3773                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3774                         vht_oper = (void *)(vht_oper_ie + 2);
3775                 if (vht_oper && !ht_oper) {
3776                         vht_oper = NULL;
3777                         sdata_info(sdata,
3778                                    "AP advertised VHT without HT, disabling both\n");
3779                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3780                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3781                 }
3782
3783                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3784                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3785                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3786                         vht_oper = NULL;
3787                 }
3788         }
3789
3790         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3791                                                      cbss->channel,
3792                                                      ht_oper, vht_oper,
3793                                                      &chandef, true);
3794
3795         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3796                                       local->rx_chains);
3797
3798         rcu_read_unlock();
3799
3800         /* will change later if needed */
3801         sdata->smps_mode = IEEE80211_SMPS_OFF;
3802
3803         /*
3804          * If this fails (possibly due to channel context sharing
3805          * on incompatible channels, e.g. 80+80 and 160 sharing the
3806          * same control channel) try to use a smaller bandwidth.
3807          */
3808         ret = ieee80211_vif_use_channel(sdata, &chandef,
3809                                         IEEE80211_CHANCTX_SHARED);
3810         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3811                 ifmgd->flags |= chandef_downgrade(&chandef);
3812                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3813                                                 IEEE80211_CHANCTX_SHARED);
3814         }
3815         return ret;
3816 }
3817
3818 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3819                                      struct cfg80211_bss *cbss, bool assoc)
3820 {
3821         struct ieee80211_local *local = sdata->local;
3822         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3823         struct ieee80211_bss *bss = (void *)cbss->priv;
3824         struct sta_info *new_sta = NULL;
3825         bool have_sta = false;
3826         int err;
3827
3828         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3829                 return -EINVAL;
3830
3831         if (assoc) {
3832                 rcu_read_lock();
3833                 have_sta = sta_info_get(sdata, cbss->bssid);
3834                 rcu_read_unlock();
3835         }
3836
3837         if (!have_sta) {
3838                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3839                 if (!new_sta)
3840                         return -ENOMEM;
3841         }
3842
3843         if (new_sta) {
3844                 u32 rates = 0, basic_rates = 0;
3845                 bool have_higher_than_11mbit;
3846                 int min_rate = INT_MAX, min_rate_index = -1;
3847                 struct ieee80211_supported_band *sband;
3848                 const struct cfg80211_bss_ies *ies;
3849
3850                 sband = local->hw.wiphy->bands[cbss->channel->band];
3851
3852                 err = ieee80211_prep_channel(sdata, cbss);
3853                 if (err) {
3854                         sta_info_free(local, new_sta);
3855                         return err;
3856                 }
3857
3858                 ieee80211_get_rates(sband, bss->supp_rates,
3859                                     bss->supp_rates_len,
3860                                     &rates, &basic_rates,
3861                                     &have_higher_than_11mbit,
3862                                     &min_rate, &min_rate_index);
3863
3864                 /*
3865                  * This used to be a workaround for basic rates missing
3866                  * in the association response frame. Now that we no
3867                  * longer use the basic rates from there, it probably
3868                  * doesn't happen any more, but keep the workaround so
3869                  * in case some *other* APs are buggy in different ways
3870                  * we can connect -- with a warning.
3871                  */
3872                 if (!basic_rates && min_rate_index >= 0) {
3873                         sdata_info(sdata,
3874                                    "No basic rates, using min rate instead\n");
3875                         basic_rates = BIT(min_rate_index);
3876                 }
3877
3878                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3879                 sdata->vif.bss_conf.basic_rates = basic_rates;
3880
3881                 /* cf. IEEE 802.11 9.2.12 */
3882                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3883                     have_higher_than_11mbit)
3884                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3885                 else
3886                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3887
3888                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3889
3890                 /* set timing information */
3891                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3892                 rcu_read_lock();
3893                 ies = rcu_dereference(cbss->beacon_ies);
3894                 if (ies) {
3895                         const u8 *tim_ie;
3896
3897                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3898                         sdata->vif.bss_conf.sync_device_ts =
3899                                 bss->device_ts_beacon;
3900                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3901                                                   ies->data, ies->len);
3902                         if (tim_ie && tim_ie[1] >= 2)
3903                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3904                         else
3905                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3906                 } else if (!(local->hw.flags &
3907                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3908                         ies = rcu_dereference(cbss->proberesp_ies);
3909                         /* must be non-NULL since beacon IEs were NULL */
3910                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3911                         sdata->vif.bss_conf.sync_device_ts =
3912                                 bss->device_ts_presp;
3913                         sdata->vif.bss_conf.sync_dtim_count = 0;
3914                 } else {
3915                         sdata->vif.bss_conf.sync_tsf = 0;
3916                         sdata->vif.bss_conf.sync_device_ts = 0;
3917                         sdata->vif.bss_conf.sync_dtim_count = 0;
3918                 }
3919                 rcu_read_unlock();
3920
3921                 /* tell driver about BSSID, basic rates and timing */
3922                 ieee80211_bss_info_change_notify(sdata,
3923                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3924                         BSS_CHANGED_BEACON_INT);
3925
3926                 if (assoc)
3927                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3928
3929                 err = sta_info_insert(new_sta);
3930                 new_sta = NULL;
3931                 if (err) {
3932                         sdata_info(sdata,
3933                                    "failed to insert STA entry for the AP (error %d)\n",
3934                                    err);
3935                         return err;
3936                 }
3937         } else
3938                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3939
3940         return 0;
3941 }
3942
3943 /* config hooks */
3944 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3945                        struct cfg80211_auth_request *req)
3946 {
3947         struct ieee80211_local *local = sdata->local;
3948         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3949         struct ieee80211_mgd_auth_data *auth_data;
3950         u16 auth_alg;
3951         int err;
3952
3953         /* prepare auth data structure */
3954
3955         switch (req->auth_type) {
3956         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3957                 auth_alg = WLAN_AUTH_OPEN;
3958                 break;
3959         case NL80211_AUTHTYPE_SHARED_KEY:
3960                 if (IS_ERR(local->wep_tx_tfm))
3961                         return -EOPNOTSUPP;
3962                 auth_alg = WLAN_AUTH_SHARED_KEY;
3963                 break;
3964         case NL80211_AUTHTYPE_FT:
3965                 auth_alg = WLAN_AUTH_FT;
3966                 break;
3967         case NL80211_AUTHTYPE_NETWORK_EAP:
3968                 auth_alg = WLAN_AUTH_LEAP;
3969                 break;
3970         case NL80211_AUTHTYPE_SAE:
3971                 auth_alg = WLAN_AUTH_SAE;
3972                 break;
3973         default:
3974                 return -EOPNOTSUPP;
3975         }
3976
3977         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3978                             req->ie_len, GFP_KERNEL);
3979         if (!auth_data)
3980                 return -ENOMEM;
3981
3982         auth_data->bss = req->bss;
3983
3984         if (req->sae_data_len >= 4) {
3985                 __le16 *pos = (__le16 *) req->sae_data;
3986                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3987                 auth_data->sae_status = le16_to_cpu(pos[1]);
3988                 memcpy(auth_data->data, req->sae_data + 4,
3989                        req->sae_data_len - 4);
3990                 auth_data->data_len += req->sae_data_len - 4;
3991         }
3992
3993         if (req->ie && req->ie_len) {
3994                 memcpy(&auth_data->data[auth_data->data_len],
3995                        req->ie, req->ie_len);
3996                 auth_data->data_len += req->ie_len;
3997         }
3998
3999         if (req->key && req->key_len) {
4000                 auth_data->key_len = req->key_len;
4001                 auth_data->key_idx = req->key_idx;
4002                 memcpy(auth_data->key, req->key, req->key_len);
4003         }
4004
4005         auth_data->algorithm = auth_alg;
4006
4007         /* try to authenticate/probe */
4008
4009         mutex_lock(&ifmgd->mtx);
4010
4011         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4012             ifmgd->assoc_data) {
4013                 err = -EBUSY;
4014                 goto err_free;
4015         }
4016
4017         if (ifmgd->auth_data)
4018                 ieee80211_destroy_auth_data(sdata, false);
4019
4020         /* prep auth_data so we don't go into idle on disassoc */
4021         ifmgd->auth_data = auth_data;
4022
4023         if (ifmgd->associated)
4024                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
4025
4026         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4027
4028         err = ieee80211_prep_connection(sdata, req->bss, false);
4029         if (err)
4030                 goto err_clear;
4031
4032         err = ieee80211_probe_auth(sdata);
4033         if (err) {
4034                 sta_info_destroy_addr(sdata, req->bss->bssid);
4035                 goto err_clear;
4036         }
4037
4038         /* hold our own reference */
4039         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4040         err = 0;
4041         goto out_unlock;
4042
4043  err_clear:
4044         memset(ifmgd->bssid, 0, ETH_ALEN);
4045         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4046         ifmgd->auth_data = NULL;
4047  err_free:
4048         kfree(auth_data);
4049  out_unlock:
4050         mutex_unlock(&ifmgd->mtx);
4051
4052         return err;
4053 }
4054
4055 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4056                         struct cfg80211_assoc_request *req)
4057 {
4058         struct ieee80211_local *local = sdata->local;
4059         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4060         struct ieee80211_bss *bss = (void *)req->bss->priv;
4061         struct ieee80211_mgd_assoc_data *assoc_data;
4062         const struct cfg80211_bss_ies *beacon_ies;
4063         struct ieee80211_supported_band *sband;
4064         const u8 *ssidie, *ht_ie, *vht_ie;
4065         int i, err;
4066
4067         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4068         if (!assoc_data)
4069                 return -ENOMEM;
4070
4071         rcu_read_lock();
4072         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4073         if (!ssidie) {
4074                 rcu_read_unlock();
4075                 kfree(assoc_data);
4076                 return -EINVAL;
4077         }
4078         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4079         assoc_data->ssid_len = ssidie[1];
4080         rcu_read_unlock();
4081
4082         mutex_lock(&ifmgd->mtx);
4083
4084         if (ifmgd->associated)
4085                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
4086
4087         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4088                 err = -EBUSY;
4089                 goto err_free;
4090         }
4091
4092         if (ifmgd->assoc_data) {
4093                 err = -EBUSY;
4094                 goto err_free;
4095         }
4096
4097         if (ifmgd->auth_data) {
4098                 bool match;
4099
4100                 /* keep sta info, bssid if matching */
4101                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4102                 ieee80211_destroy_auth_data(sdata, match);
4103         }
4104
4105         /* prepare assoc data */
4106
4107         ifmgd->beacon_crc_valid = false;
4108
4109         /*
4110          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4111          * We still associate in non-HT mode (11a/b/g) if any one of these
4112          * ciphers is configured as pairwise.
4113          * We can set this to true for non-11n hardware, that'll be checked
4114          * separately along with the peer capabilities.
4115          */
4116         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4117                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4118                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4119                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4120                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4121                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4122                         netdev_info(sdata->dev,
4123                                     "disabling HT/VHT due to WEP/TKIP use\n");
4124                 }
4125         }
4126
4127         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4128                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4129                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4130         }
4131
4132         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4133                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4134
4135         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4136         sband = local->hw.wiphy->bands[req->bss->channel->band];
4137         if (!sband->ht_cap.ht_supported ||
4138             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4139                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4140                 if (!bss->wmm_used)
4141                         netdev_info(sdata->dev,
4142                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4143         }
4144
4145         /* disable VHT if we don't support it or the AP doesn't use WMM */
4146         if (!sband->vht_cap.vht_supported ||
4147             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4148                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4149                 if (!bss->wmm_used)
4150                         netdev_info(sdata->dev,
4151                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4152         }
4153
4154         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4155         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4156                sizeof(ifmgd->ht_capa_mask));
4157
4158         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4159         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4160                sizeof(ifmgd->vht_capa_mask));
4161
4162         if (req->ie && req->ie_len) {
4163                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4164                 assoc_data->ie_len = req->ie_len;
4165         }
4166
4167         assoc_data->bss = req->bss;
4168
4169         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4170                 if (ifmgd->powersave)
4171                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4172                 else
4173                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4174         } else
4175                 sdata->smps_mode = ifmgd->req_smps;
4176
4177         assoc_data->capability = req->bss->capability;
4178         assoc_data->wmm = bss->wmm_used &&
4179                           (local->hw.queues >= IEEE80211_NUM_ACS);
4180         assoc_data->supp_rates = bss->supp_rates;
4181         assoc_data->supp_rates_len = bss->supp_rates_len;
4182
4183         rcu_read_lock();
4184         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4185         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4186                 assoc_data->ap_ht_param =
4187                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4188         else
4189                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4190         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4191         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4192                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4193                        sizeof(struct ieee80211_vht_cap));
4194         else
4195                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4196         rcu_read_unlock();
4197
4198         if (bss->wmm_used && bss->uapsd_supported &&
4199             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4200             sdata->wmm_acm != 0xff) {
4201                 assoc_data->uapsd = true;
4202                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4203         } else {
4204                 assoc_data->uapsd = false;
4205                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4206         }
4207
4208         if (req->prev_bssid)
4209                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4210
4211         if (req->use_mfp) {
4212                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4213                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4214         } else {
4215                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4216                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4217         }
4218
4219         if (req->crypto.control_port)
4220                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4221         else
4222                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4223
4224         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4225         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4226
4227         /* kick off associate process */
4228
4229         ifmgd->assoc_data = assoc_data;
4230         ifmgd->dtim_period = 0;
4231
4232         err = ieee80211_prep_connection(sdata, req->bss, true);
4233         if (err)
4234                 goto err_clear;
4235
4236         rcu_read_lock();
4237         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4238
4239         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4240             !beacon_ies) {
4241                 /*
4242                  * Wait up to one beacon interval ...
4243                  * should this be more if we miss one?
4244                  */
4245                 sdata_info(sdata, "waiting for beacon from %pM\n",
4246                            ifmgd->bssid);
4247                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4248                 assoc_data->timeout_started = true;
4249                 assoc_data->need_beacon = true;
4250         } else if (beacon_ies) {
4251                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4252                                                     beacon_ies->data,
4253                                                     beacon_ies->len);
4254                 u8 dtim_count = 0;
4255
4256                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4257                         const struct ieee80211_tim_ie *tim;
4258                         tim = (void *)(tim_ie + 2);
4259                         ifmgd->dtim_period = tim->dtim_period;
4260                         dtim_count = tim->dtim_count;
4261                 }
4262                 assoc_data->have_beacon = true;
4263                 assoc_data->timeout = jiffies;
4264                 assoc_data->timeout_started = true;
4265
4266                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4267                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4268                         sdata->vif.bss_conf.sync_device_ts =
4269                                 bss->device_ts_beacon;
4270                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4271                 }
4272         } else {
4273                 assoc_data->timeout = jiffies;
4274                 assoc_data->timeout_started = true;
4275         }
4276         rcu_read_unlock();
4277
4278         run_again(ifmgd, assoc_data->timeout);
4279
4280         if (bss->corrupt_data) {
4281                 char *corrupt_type = "data";
4282                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4283                         if (bss->corrupt_data &
4284                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4285                                 corrupt_type = "beacon and probe response";
4286                         else
4287                                 corrupt_type = "beacon";
4288                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4289                         corrupt_type = "probe response";
4290                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4291                            corrupt_type);
4292         }
4293
4294         err = 0;
4295         goto out;
4296  err_clear:
4297         memset(ifmgd->bssid, 0, ETH_ALEN);
4298         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4299         ifmgd->assoc_data = NULL;
4300  err_free:
4301         kfree(assoc_data);
4302  out:
4303         mutex_unlock(&ifmgd->mtx);
4304
4305         return err;
4306 }
4307
4308 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4309                          struct cfg80211_deauth_request *req)
4310 {
4311         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4312         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4313         bool tx = !req->local_state_change;
4314         bool sent_frame = false;
4315
4316         mutex_lock(&ifmgd->mtx);
4317
4318         sdata_info(sdata,
4319                    "deauthenticating from %pM by local choice (reason=%d)\n",
4320                    req->bssid, req->reason_code);
4321
4322         if (ifmgd->auth_data) {
4323                 drv_mgd_prepare_tx(sdata->local, sdata);
4324                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4325                                                IEEE80211_STYPE_DEAUTH,
4326                                                req->reason_code, tx,
4327                                                frame_buf);
4328                 ieee80211_destroy_auth_data(sdata, false);
4329                 mutex_unlock(&ifmgd->mtx);
4330
4331                 sent_frame = tx;
4332                 goto out;
4333         }
4334
4335         if (ifmgd->associated &&
4336             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4337                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4338                                        req->reason_code, tx, frame_buf);
4339                 sent_frame = tx;
4340         }
4341         mutex_unlock(&ifmgd->mtx);
4342
4343  out:
4344         if (sent_frame)
4345                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4346                                        IEEE80211_DEAUTH_FRAME_LEN);
4347
4348         return 0;
4349 }
4350
4351 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4352                            struct cfg80211_disassoc_request *req)
4353 {
4354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4355         u8 bssid[ETH_ALEN];
4356         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4357
4358         mutex_lock(&ifmgd->mtx);
4359
4360         /*
4361          * cfg80211 should catch this ... but it's racy since
4362          * we can receive a disassoc frame, process it, hand it
4363          * to cfg80211 while that's in a locked section already
4364          * trying to tell us that the user wants to disconnect.
4365          */
4366         if (ifmgd->associated != req->bss) {
4367                 mutex_unlock(&ifmgd->mtx);
4368                 return -ENOLINK;
4369         }
4370
4371         sdata_info(sdata,
4372                    "disassociating from %pM by local choice (reason=%d)\n",
4373                    req->bss->bssid, req->reason_code);
4374
4375         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4376         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4377                                req->reason_code, !req->local_state_change,
4378                                frame_buf);
4379         mutex_unlock(&ifmgd->mtx);
4380
4381         __cfg80211_send_disassoc(sdata->dev, frame_buf,
4382                                  IEEE80211_DEAUTH_FRAME_LEN);
4383
4384         return 0;
4385 }
4386
4387 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4388 {
4389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4390
4391         /*
4392          * Make sure some work items will not run after this,
4393          * they will not do anything but might not have been
4394          * cancelled when disconnecting.
4395          */
4396         cancel_work_sync(&ifmgd->monitor_work);
4397         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4398         cancel_work_sync(&ifmgd->request_smps_work);
4399         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4400         cancel_work_sync(&ifmgd->chswitch_work);
4401
4402         mutex_lock(&ifmgd->mtx);
4403         if (ifmgd->assoc_data)
4404                 ieee80211_destroy_assoc_data(sdata, false);
4405         if (ifmgd->auth_data)
4406                 ieee80211_destroy_auth_data(sdata, false);
4407         del_timer_sync(&ifmgd->timer);
4408         mutex_unlock(&ifmgd->mtx);
4409 }
4410
4411 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4412                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4413                                gfp_t gfp)
4414 {
4415         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4416
4417         trace_api_cqm_rssi_notify(sdata, rssi_event);
4418
4419         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4420 }
4421 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);