net/mac80211/work.c

   1 /*
   2  * mac80211 work implementation
   3  *
   4  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   5  * Copyright 2004, Instant802 Networks, Inc.
   6  * Copyright 2005, Devicescape Software, Inc.
   7  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   9  * Copyright 2009, Johannes Berg <johannes@sipsolutions.net>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/crc32.h>
  22 #include <linux/slab.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "driver-ops.h"
  29
  30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34
  35 enum work_action {
  36         WORK_ACT_MISMATCH,
  37         WORK_ACT_NONE,
  38         WORK_ACT_TIMEOUT,
  39         WORK_ACT_DONE,
  40 };
  41
  42
  43 /* utils */
  44 static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
  45 {
  46         lockdep_assert_held(&local->mtx);
  47 }
  48
  49 /*
  50  * We can have multiple work items (and connection probing)
  51  * scheduling this timer, but we need to take care to only
  52  * reschedule it when it should fire _earlier_ than it was
  53  * asked for before, or if it's not pending right now. This
  54  * function ensures that. Note that it then is required to
  55  * run this function for all timeouts after the first one
  56  * has happened -- the work that runs from this timer will
  57  * do that.
  58  */
  59 static void run_again(struct ieee80211_local *local,
  60                       unsigned long timeout)
  61 {
  62         ASSERT_WORK_MTX(local);
  63
  64         if (!timer_pending(&local->work_timer) ||
  65             time_before(timeout, local->work_timer.expires))
  66                 mod_timer(&local->work_timer, timeout);
  67 }
  68
  69 void free_work(struct ieee80211_work *wk)
  70 {
  71         kfree_rcu(wk, rcu_head);
  72 }
  73
  74 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u32 *rates)
  77 {
  78         int i, j, count;
  79         *rates = 0;
  80         count = 0;
  81         for (i = 0; i < supp_rates_len; i++) {
  82                 int rate = (supp_rates[i] & 0x7F) * 5;
  83
  84                 for (j = 0; j < sband->n_bitrates; j++)
  85                         if (sband->bitrates[j].bitrate == rate) {
  86                                 *rates |= BIT(j);
  87                                 count++;
  88                                 break;
  89                         }
  90         }
  91
  92         return count;
  93 }
  94
  95 /* frame sending functions */
  96
  97 static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
  98                                 struct ieee80211_supported_band *sband,
  99                                 struct ieee80211_channel *channel,
 100                                 enum ieee80211_smps_mode smps)
 101 {
 102         struct ieee80211_ht_info *ht_info;
 103         u8 *pos;
 104         u32 flags = channel->flags;
 105         u16 cap = sband->ht_cap.cap;
 106         __le16 tmp;
 107
 108         if (!sband->ht_cap.ht_supported)
 109                 return;
 110
 111         if (!ht_info_ie)
 112                 return;
 113
 114         if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
 115                 return;
 116
 117         ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
 118
 119         /* determine capability flags */
 120
 121         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 122         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 123                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 124                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 125                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 126                 }
 127                 break;
 128         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 129                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 130                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 131                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 132                 }
 133                 break;
 134         }
 135
 136         /* set SM PS mode properly */
 137         cap &= ~IEEE80211_HT_CAP_SM_PS;
 138         switch (smps) {
 139         case IEEE80211_SMPS_AUTOMATIC:
 140         case IEEE80211_SMPS_NUM_MODES:
 141                 WARN_ON(1);
 142         case IEEE80211_SMPS_OFF:
 143                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 144                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 145                 break;
 146         case IEEE80211_SMPS_STATIC:
 147                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 148                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 149                 break;
 150         case IEEE80211_SMPS_DYNAMIC:
 151                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 152                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 153                 break;
 154         }
 155
 156         /* reserve and fill IE */
 157
 158         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 159         *pos++ = WLAN_EID_HT_CAPABILITY;
 160         *pos++ = sizeof(struct ieee80211_ht_cap);
 161         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 162
 163         /* capability flags */
 164         tmp = cpu_to_le16(cap);
 165         memcpy(pos, &tmp, sizeof(u16));
 166         pos += sizeof(u16);
 167
 168         /* AMPDU parameters */
 169         *pos++ = sband->ht_cap.ampdu_factor |
 170                  (sband->ht_cap.ampdu_density <<
 171                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 172
 173         /* MCS set */
 174         memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 175         pos += sizeof(sband->ht_cap.mcs);
 176
 177         /* extended capabilities */
 178         pos += sizeof(__le16);
 179
 180         /* BF capabilities */
 181         pos += sizeof(__le32);
 182
 183         /* antenna selection */
 184         pos += sizeof(u8);
 185 }
 186
 187 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 188                                  struct ieee80211_work *wk)
 189 {
 190         struct ieee80211_local *local = sdata->local;
 191         struct sk_buff *skb;
 192         struct ieee80211_mgmt *mgmt;
 193         u8 *pos, qos_info;
 194         size_t offset = 0, noffset;
 195         int i, count, rates_len, supp_rates_len;
 196         u16 capab;
 197         struct ieee80211_supported_band *sband;
 198         u32 rates = 0;
 199
 200         sband = local->hw.wiphy->bands[wk->chan->band];
 201
 202         if (wk->assoc.supp_rates_len) {
 203                 /*
 204                  * Get all rates supported by the device and the AP as
 205                  * some APs don't like getting a superset of their rates
 206                  * in the association request (e.g. D-Link DAP 1353 in
 207                  * b-only mode)...
 208                  */
 209                 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
 210                                                        wk->assoc.supp_rates_len,
 211                                                        sband, &rates);
 212         } else {
 213                 /*
 214                  * In case AP not provide any supported rates information
 215                  * before association, we send information element(s) with
 216                  * all rates that we support.
 217                  */
 218                 rates = ~0;
 219                 rates_len = sband->n_bitrates;
 220         }
 221
 222         skb = alloc_skb(local->hw.extra_tx_headroom +
 223                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 224                         2 + wk->assoc.ssid_len + /* SSID */
 225                         4 + rates_len + /* (extended) rates */
 226                         4 + /* power capability */
 227                         2 + 2 * sband->n_channels + /* supported channels */
 228                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 229                         wk->ie_len + /* extra IEs */
 230                         9, /* WMM */
 231                         GFP_KERNEL);
 232         if (!skb)
 233                 return;
 234
 235         skb_reserve(skb, local->hw.extra_tx_headroom);
 236
 237         capab = WLAN_CAPABILITY_ESS;
 238
 239         if (sband->band == IEEE80211_BAND_2GHZ) {
 240                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 241                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 242                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 243                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 244         }
 245
 246         if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
 247                 capab |= WLAN_CAPABILITY_PRIVACY;
 248
 249         if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 250             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 251                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 252
 253         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 254         memset(mgmt, 0, 24);
 255         memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
 256         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 257         memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
 258
 259         if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
 260                 skb_put(skb, 10);
 261                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 262                                                   IEEE80211_STYPE_REASSOC_REQ);
 263                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 264                 mgmt->u.reassoc_req.listen_interval =
 265                                 cpu_to_le16(local->hw.conf.listen_interval);
 266                 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
 267                        ETH_ALEN);
 268         } else {
 269                 skb_put(skb, 4);
 270                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 271                                                   IEEE80211_STYPE_ASSOC_REQ);
 272                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 273                 mgmt->u.assoc_req.listen_interval =
 274                                 cpu_to_le16(local->hw.conf.listen_interval);
 275         }
 276
 277         /* SSID */
 278         pos = skb_put(skb, 2 + wk->assoc.ssid_len);
 279         *pos++ = WLAN_EID_SSID;
 280         *pos++ = wk->assoc.ssid_len;
 281         memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
 282
 283         /* add all rates which were marked to be used above */
 284         supp_rates_len = rates_len;
 285         if (supp_rates_len > 8)
 286                 supp_rates_len = 8;
 287
 288         pos = skb_put(skb, supp_rates_len + 2);
 289         *pos++ = WLAN_EID_SUPP_RATES;
 290         *pos++ = supp_rates_len;
 291
 292         count = 0;
 293         for (i = 0; i < sband->n_bitrates; i++) {
 294                 if (BIT(i) & rates) {
 295                         int rate = sband->bitrates[i].bitrate;
 296                         *pos++ = (u8) (rate / 5);
 297                         if (++count == 8)
 298                                 break;
 299                 }
 300         }
 301
 302         if (rates_len > count) {
 303                 pos = skb_put(skb, rates_len - count + 2);
 304                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 305                 *pos++ = rates_len - count;
 306
 307                 for (i++; i < sband->n_bitrates; i++) {
 308                         if (BIT(i) & rates) {
 309                                 int rate = sband->bitrates[i].bitrate;
 310                                 *pos++ = (u8) (rate / 5);
 311                         }
 312                 }
 313         }
 314
 315         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 316                 /* 1. power capabilities */
 317                 pos = skb_put(skb, 4);
 318                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 319                 *pos++ = 2;
 320                 *pos++ = 0; /* min tx power */
 321                 *pos++ = wk->chan->max_power; /* max tx power */
 322
 323                 /* 2. supported channels */
 324                 /* TODO: get this in reg domain format */
 325                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 326                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 327                 *pos++ = 2 * sband->n_channels;
 328                 for (i = 0; i < sband->n_channels; i++) {
 329                         *pos++ = ieee80211_frequency_to_channel(
 330                                         sband->channels[i].center_freq);
 331                         *pos++ = 1; /* one channel in the subband*/
 332                 }
 333         }
 334
 335         /* if present, add any custom IEs that go before HT */
 336         if (wk->ie_len && wk->ie) {
 337                 static const u8 before_ht[] = {
 338                         WLAN_EID_SSID,
 339                         WLAN_EID_SUPP_RATES,
 340                         WLAN_EID_EXT_SUPP_RATES,
 341                         WLAN_EID_PWR_CAPABILITY,
 342                         WLAN_EID_SUPPORTED_CHANNELS,
 343                         WLAN_EID_RSN,
 344                         WLAN_EID_QOS_CAPA,
 345                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 346                         WLAN_EID_MOBILITY_DOMAIN,
 347                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 348                 };
 349                 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
 350                                              before_ht, ARRAY_SIZE(before_ht),
 351                                              offset);
 352                 pos = skb_put(skb, noffset - offset);
 353                 memcpy(pos, wk->ie + offset, noffset - offset);
 354                 offset = noffset;
 355         }
 356
 357         if (wk->assoc.use_11n && wk->assoc.wmm_used &&
 358             local->hw.queues >= 4)
 359                 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
 360                                     sband, wk->chan, wk->assoc.smps);
 361
 362         /* if present, add any custom non-vendor IEs that go after HT */
 363         if (wk->ie_len && wk->ie) {
 364                 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
 365                                                     offset);
 366                 pos = skb_put(skb, noffset - offset);
 367                 memcpy(pos, wk->ie + offset, noffset - offset);
 368                 offset = noffset;
 369         }
 370
 371         if (wk->assoc.wmm_used && local->hw.queues >= 4) {
 372                 if (wk->assoc.uapsd_used) {
 373                         qos_info = local->uapsd_queues;
 374                         qos_info |= (local->uapsd_max_sp_len <<
 375                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 376                 } else {
 377                         qos_info = 0;
 378                 }
 379
 380                 pos = skb_put(skb, 9);
 381                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 382                 *pos++ = 7; /* len */
 383                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 384                 *pos++ = 0x50;
 385                 *pos++ = 0xf2;
 386                 *pos++ = 2; /* WME */
 387                 *pos++ = 0; /* WME info */
 388                 *pos++ = 1; /* WME ver */
 389                 *pos++ = qos_info;
 390         }
 391
 392         /* add any remaining custom (i.e. vendor specific here) IEs */
 393         if (wk->ie_len && wk->ie) {
 394                 noffset = wk->ie_len;
 395                 pos = skb_put(skb, noffset - offset);
 396                 memcpy(pos, wk->ie + offset, noffset - offset);
 397         }
 398
 399         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 400         ieee80211_tx_skb(sdata, skb);
 401 }
 402
 403 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
 404                                       struct ieee80211_work *wk)
 405 {
 406         struct cfg80211_bss *cbss;
 407         u16 capa_val = WLAN_CAPABILITY_ESS;
 408
 409         if (wk->probe_auth.privacy)
 410                 capa_val |= WLAN_CAPABILITY_PRIVACY;
 411
 412         cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
 413                                 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
 414                                 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 415                                 capa_val);
 416         if (!cbss)
 417                 return;
 418
 419         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 420         cfg80211_put_bss(cbss);
 421 }
 422
 423 static enum work_action __must_check
 424 ieee80211_direct_probe(struct ieee80211_work *wk)
 425 {
 426         struct ieee80211_sub_if_data *sdata = wk->sdata;
 427         struct ieee80211_local *local = sdata->local;
 428
 429         if (!wk->probe_auth.synced) {
 430                 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
 431                                       IEEE80211_TX_SYNC_AUTH);
 432                 if (ret)
 433                         return WORK_ACT_TIMEOUT;
 434         }
 435         wk->probe_auth.synced = true;
 436
 437         wk->probe_auth.tries++;
 438         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
 439                 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
 440                        sdata->name, wk->filter_ta);
 441
 442                 /*
 443                  * Most likely AP is not in the range so remove the
 444                  * bss struct for that AP.
 445                  */
 446                 ieee80211_remove_auth_bss(local, wk);
 447
 448                 return WORK_ACT_TIMEOUT;
 449         }
 450
 451         printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
 452                sdata->name, wk->filter_ta, wk->probe_auth.tries,
 453                IEEE80211_AUTH_MAX_TRIES);
 454
 455         /*
 456          * Direct probe is sent to broadcast address as some APs
 457          * will not answer to direct packet in unassociated state.
 458          */
 459         ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
 460                                  wk->probe_auth.ssid_len, NULL, 0,
 461                                  (u32) -1, true, false);
 462
 463         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 464         run_again(local, wk->timeout);
 465
 466         return WORK_ACT_NONE;
 467 }
 468
 469
 470 static enum work_action __must_check
 471 ieee80211_authenticate(struct ieee80211_work *wk)
 472 {
 473         struct ieee80211_sub_if_data *sdata = wk->sdata;
 474         struct ieee80211_local *local = sdata->local;
 475
 476         if (!wk->probe_auth.synced) {
 477                 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
 478                                       IEEE80211_TX_SYNC_AUTH);
 479                 if (ret)
 480                         return WORK_ACT_TIMEOUT;
 481         }
 482         wk->probe_auth.synced = true;
 483
 484         wk->probe_auth.tries++;
 485         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
 486                 printk(KERN_DEBUG "%s: authentication with %pM"
 487                        " timed out\n", sdata->name, wk->filter_ta);
 488
 489                 /*
 490                  * Most likely AP is not in the range so remove the
 491                  * bss struct for that AP.
 492                  */
 493                 ieee80211_remove_auth_bss(local, wk);
 494
 495                 return WORK_ACT_TIMEOUT;
 496         }
 497
 498         printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
 499                sdata->name, wk->filter_ta, wk->probe_auth.tries);
 500
 501         ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
 502                             wk->ie_len, wk->filter_ta, NULL, 0, 0);
 503         wk->probe_auth.transaction = 2;
 504
 505         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 506         run_again(local, wk->timeout);
 507
 508         return WORK_ACT_NONE;
 509 }
 510
 511 static enum work_action __must_check
 512 ieee80211_associate(struct ieee80211_work *wk)
 513 {
 514         struct ieee80211_sub_if_data *sdata = wk->sdata;
 515         struct ieee80211_local *local = sdata->local;
 516
 517         if (!wk->assoc.synced) {
 518                 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
 519                                       IEEE80211_TX_SYNC_ASSOC);
 520                 if (ret)
 521                         return WORK_ACT_TIMEOUT;
 522         }
 523         wk->assoc.synced = true;
 524
 525         wk->assoc.tries++;
 526         if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
 527                 printk(KERN_DEBUG "%s: association with %pM"
 528                        " timed out\n",
 529                        sdata->name, wk->filter_ta);
 530
 531                 /*
 532                  * Most likely AP is not in the range so remove the
 533                  * bss struct for that AP.
 534                  */
 535                 if (wk->assoc.bss)
 536                         cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
 537
 538                 return WORK_ACT_TIMEOUT;
 539         }
 540
 541         printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
 542                sdata->name, wk->filter_ta, wk->assoc.tries);
 543         ieee80211_send_assoc(sdata, wk);
 544
 545         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
 546         run_again(local, wk->timeout);
 547
 548         return WORK_ACT_NONE;
 549 }
 550
 551 static enum work_action __must_check
 552 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
 553 {
 554         /*
 555          * First time we run, do nothing -- the generic code will
 556          * have switched to the right channel etc.
 557          */
 558         if (!wk->started) {
 559                 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
 560
 561                 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
 562                                           wk->chan, wk->chan_type,
 563                                           wk->remain.duration, GFP_KERNEL);
 564
 565                 return WORK_ACT_NONE;
 566         }
 567
 568         return WORK_ACT_TIMEOUT;
 569 }
 570
 571 static enum work_action __must_check
 572 ieee80211_offchannel_tx(struct ieee80211_work *wk)
 573 {
 574         if (!wk->started) {
 575                 wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
 576
 577                 /*
 578                  * After this, offchan_tx.frame remains but now is no
 579                  * longer a valid pointer -- we still need it as the
 580                  * cookie for canceling this work/status matching.
 581                  */
 582                 ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
 583
 584                 return WORK_ACT_NONE;
 585         }
 586
 587         return WORK_ACT_TIMEOUT;
 588 }
 589
 590 static enum work_action __must_check
 591 ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
 592 {
 593         if (wk->started)
 594                 return WORK_ACT_TIMEOUT;
 595
 596         /*
 597          * Wait up to one beacon interval ...
 598          * should this be more if we miss one?
 599          */
 600         printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
 601                wk->sdata->name, wk->filter_ta);
 602         wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
 603         return WORK_ACT_NONE;
 604 }
 605
 606 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
 607                                      struct ieee80211_mgmt *mgmt,
 608                                      size_t len)
 609 {
 610         struct ieee80211_sub_if_data *sdata = wk->sdata;
 611         u8 *pos;
 612         struct ieee802_11_elems elems;
 613
 614         pos = mgmt->u.auth.variable;
 615         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 616         if (!elems.challenge)
 617                 return;
 618         ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
 619                             elems.challenge - 2, elems.challenge_len + 2,
 620                             wk->filter_ta, wk->probe_auth.key,
 621                             wk->probe_auth.key_len, wk->probe_auth.key_idx);
 622         wk->probe_auth.transaction = 4;
 623 }
 624
 625 static enum work_action __must_check
 626 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
 627                        struct ieee80211_mgmt *mgmt, size_t len)
 628 {
 629         u16 auth_alg, auth_transaction, status_code;
 630
 631         if (wk->type != IEEE80211_WORK_AUTH)
 632                 return WORK_ACT_MISMATCH;
 633
 634         if (len < 24 + 6)
 635                 return WORK_ACT_NONE;
 636
 637         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 638         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 639         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 640
 641         if (auth_alg != wk->probe_auth.algorithm ||
 642             auth_transaction != wk->probe_auth.transaction)
 643                 return WORK_ACT_NONE;
 644
 645         if (status_code != WLAN_STATUS_SUCCESS) {
 646                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
 647                        wk->sdata->name, mgmt->sa, status_code);
 648                 return WORK_ACT_DONE;
 649         }
 650
 651         switch (wk->probe_auth.algorithm) {
 652         case WLAN_AUTH_OPEN:
 653         case WLAN_AUTH_LEAP:
 654         case WLAN_AUTH_FT:
 655                 break;
 656         case WLAN_AUTH_SHARED_KEY:
 657                 if (wk->probe_auth.transaction != 4) {
 658                         ieee80211_auth_challenge(wk, mgmt, len);
 659                         /* need another frame */
 660                         return WORK_ACT_NONE;
 661                 }
 662                 break;
 663         default:
 664                 WARN_ON(1);
 665                 return WORK_ACT_NONE;
 666         }
 667
 668         printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
 669         return WORK_ACT_DONE;
 670 }
 671
 672 static enum work_action __must_check
 673 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
 674                              struct ieee80211_mgmt *mgmt, size_t len,
 675                              bool reassoc)
 676 {
 677         struct ieee80211_sub_if_data *sdata = wk->sdata;
 678         struct ieee80211_local *local = sdata->local;
 679         u16 capab_info, status_code, aid;
 680         struct ieee802_11_elems elems;
 681         u8 *pos;
 682
 683         if (wk->type != IEEE80211_WORK_ASSOC)
 684                 return WORK_ACT_MISMATCH;
 685
 686         /*
 687          * AssocResp and ReassocResp have identical structure, so process both
 688          * of them in this function.
 689          */
 690
 691         if (len < 24 + 6)
 692                 return WORK_ACT_NONE;
 693
 694         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
 695         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
 696         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
 697
 698         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
 699                "status=%d aid=%d)\n",
 700                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
 701                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
 702
 703         pos = mgmt->u.assoc_resp.variable;
 704         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 705
 706         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
 707             elems.timeout_int && elems.timeout_int_len == 5 &&
 708             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
 709                 u32 tu, ms;
 710                 tu = get_unaligned_le32(elems.timeout_int + 1);
 711                 ms = tu * 1024 / 1000;
 712                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
 713                        "comeback duration %u TU (%u ms)\n",
 714                        sdata->name, mgmt->sa, tu, ms);
 715                 wk->timeout = jiffies + msecs_to_jiffies(ms);
 716                 if (ms > IEEE80211_ASSOC_TIMEOUT)
 717                         run_again(local, wk->timeout);
 718                 return WORK_ACT_NONE;
 719         }
 720
 721         if (status_code != WLAN_STATUS_SUCCESS)
 722                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
 723                        sdata->name, mgmt->sa, status_code);
 724         else
 725                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
 726
 727         return WORK_ACT_DONE;
 728 }
 729
 730 static enum work_action __must_check
 731 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
 732                              struct ieee80211_mgmt *mgmt, size_t len,
 733                              struct ieee80211_rx_status *rx_status)
 734 {
 735         struct ieee80211_sub_if_data *sdata = wk->sdata;
 736         struct ieee80211_local *local = sdata->local;
 737         size_t baselen;
 738
 739         ASSERT_WORK_MTX(local);
 740
 741         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
 742                 return WORK_ACT_MISMATCH;
 743
 744         if (len < 24 + 12)
 745                 return WORK_ACT_NONE;
 746
 747         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 748         if (baselen > len)
 749                 return WORK_ACT_NONE;
 750
 751         printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
 752         return WORK_ACT_DONE;
 753 }
 754
 755 static enum work_action __must_check
 756 ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
 757                          struct ieee80211_mgmt *mgmt, size_t len)
 758 {
 759         struct ieee80211_sub_if_data *sdata = wk->sdata;
 760         struct ieee80211_local *local = sdata->local;
 761
 762         ASSERT_WORK_MTX(local);
 763
 764         if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
 765                 return WORK_ACT_MISMATCH;
 766
 767         if (len < 24 + 12)
 768                 return WORK_ACT_NONE;
 769
 770         printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
 771         return WORK_ACT_DONE;
 772 }
 773
 774 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
 775                                           struct sk_buff *skb)
 776 {
 777         struct ieee80211_rx_status *rx_status;
 778         struct ieee80211_mgmt *mgmt;
 779         struct ieee80211_work *wk;
 780         enum work_action rma = WORK_ACT_NONE;
 781         u16 fc;
 782
 783         rx_status = (struct ieee80211_rx_status *) skb->cb;
 784         mgmt = (struct ieee80211_mgmt *) skb->data;
 785         fc = le16_to_cpu(mgmt->frame_control);
 786
 787         mutex_lock(&local->mtx);
 788
 789         list_for_each_entry(wk, &local->work_list, list) {
 790                 const u8 *bssid = NULL;
 791
 792                 switch (wk->type) {
 793                 case IEEE80211_WORK_DIRECT_PROBE:
 794                 case IEEE80211_WORK_AUTH:
 795                 case IEEE80211_WORK_ASSOC:
 796                 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
 797                         bssid = wk->filter_ta;
 798                         break;
 799                 default:
 800                         continue;
 801                 }
 802
 803                 /*
 804                  * Before queuing, we already verified mgmt->sa,
 805                  * so this is needed just for matching.
 806                  */
 807                 if (compare_ether_addr(bssid, mgmt->bssid))
 808                         continue;
 809
 810                 switch (fc & IEEE80211_FCTL_STYPE) {
 811                 case IEEE80211_STYPE_BEACON:
 812                         rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
 813                         break;
 814                 case IEEE80211_STYPE_PROBE_RESP:
 815                         rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
 816                                                            rx_status);
 817                         break;
 818                 case IEEE80211_STYPE_AUTH:
 819                         rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
 820                         break;
 821                 case IEEE80211_STYPE_ASSOC_RESP:
 822                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
 823                                                            skb->len, false);
 824                         break;
 825                 case IEEE80211_STYPE_REASSOC_RESP:
 826                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
 827                                                            skb->len, true);
 828                         break;
 829                 default:
 830                         WARN_ON(1);
 831                         rma = WORK_ACT_NONE;
 832                 }
 833
 834                 /*
 835                  * We've either received an unexpected frame, or we have
 836                  * multiple work items and need to match the frame to the
 837                  * right one.
 838                  */
 839                 if (rma == WORK_ACT_MISMATCH)
 840                         continue;
 841
 842                 /*
 843                  * We've processed this frame for that work, so it can't
 844                  * belong to another work struct.
 845                  * NB: this is also required for correctness for 'rma'!
 846                  */
 847                 break;
 848         }
 849
 850         switch (rma) {
 851         case WORK_ACT_MISMATCH:
 852                 /* ignore this unmatched frame */
 853                 break;
 854         case WORK_ACT_NONE:
 855                 break;
 856         case WORK_ACT_DONE:
 857                 list_del_rcu(&wk->list);
 858                 break;
 859         default:
 860                 WARN(1, "unexpected: %d", rma);
 861         }
 862
 863         mutex_unlock(&local->mtx);
 864
 865         if (rma != WORK_ACT_DONE)
 866                 goto out;
 867
 868         switch (wk->done(wk, skb)) {
 869         case WORK_DONE_DESTROY:
 870                 free_work(wk);
 871                 break;
 872         case WORK_DONE_REQUEUE:
 873                 synchronize_rcu();
 874                 wk->started = false; /* restart */
 875                 mutex_lock(&local->mtx);
 876                 list_add_tail(&wk->list, &local->work_list);
 877                 mutex_unlock(&local->mtx);
 878         }
 879
 880  out:
 881         kfree_skb(skb);
 882 }
 883
 884 static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
 885                                        enum nl80211_channel_type oper_ct)
 886 {
 887         switch (wk_ct) {
 888         case NL80211_CHAN_NO_HT:
 889                 return true;
 890         case NL80211_CHAN_HT20:
 891                 if (oper_ct != NL80211_CHAN_NO_HT)
 892                         return true;
 893                 return false;
 894         case NL80211_CHAN_HT40MINUS:
 895         case NL80211_CHAN_HT40PLUS:
 896                 return (wk_ct == oper_ct);
 897         }
 898         WARN_ON(1); /* shouldn't get here */
 899         return false;
 900 }
 901
 902 static enum nl80211_channel_type
 903 ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
 904                   enum nl80211_channel_type oper_ct)
 905 {
 906         switch (wk_ct) {
 907         case NL80211_CHAN_NO_HT:
 908                 return oper_ct;
 909         case NL80211_CHAN_HT20:
 910                 if (oper_ct != NL80211_CHAN_NO_HT)
 911                         return oper_ct;
 912                 return wk_ct;
 913         case NL80211_CHAN_HT40MINUS:
 914         case NL80211_CHAN_HT40PLUS:
 915                 return wk_ct;
 916         }
 917         WARN_ON(1); /* shouldn't get here */
 918         return wk_ct;
 919 }
 920
 921
 922 static void ieee80211_work_timer(unsigned long data)
 923 {
 924         struct ieee80211_local *local = (void *) data;
 925
 926         if (local->quiescing)
 927                 return;
 928
 929         ieee80211_queue_work(&local->hw, &local->work_work);
 930 }
 931
 932 static void ieee80211_work_work(struct work_struct *work)
 933 {
 934         struct ieee80211_local *local =
 935                 container_of(work, struct ieee80211_local, work_work);
 936         struct sk_buff *skb;
 937         struct ieee80211_work *wk, *tmp;
 938         LIST_HEAD(free_work);
 939         enum work_action rma;
 940         bool remain_off_channel = false;
 941
 942         if (local->scanning)
 943                 return;
 944
 945         /*
 946          * ieee80211_queue_work() should have picked up most cases,
 947          * here we'll pick the rest.
 948          */
 949         if (WARN(local->suspended, "work scheduled while going to suspend\n"))
 950                 return;
 951
 952         /* first process frames to avoid timing out while a frame is pending */
 953         while ((skb = skb_dequeue(&local->work_skb_queue)))
 954                 ieee80211_work_rx_queued_mgmt(local, skb);
 955
 956         mutex_lock(&local->mtx);
 957
 958         ieee80211_recalc_idle(local);
 959
 960         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
 961                 bool started = wk->started;
 962
 963                 /* mark work as started if it's on the current off-channel */
 964                 if (!started && local->tmp_channel &&
 965                     wk->chan == local->tmp_channel &&
 966                     wk->chan_type == local->tmp_channel_type) {
 967                         started = true;
 968                         wk->timeout = jiffies;
 969                 }
 970
 971                 if (!started && !local->tmp_channel) {
 972                         bool on_oper_chan;
 973                         bool tmp_chan_changed = false;
 974                         bool on_oper_chan2;
 975                         enum nl80211_channel_type wk_ct;
 976                         on_oper_chan = ieee80211_cfg_on_oper_channel(local);
 977
 978                         /* Work with existing channel type if possible. */
 979                         wk_ct = wk->chan_type;
 980                         if (wk->chan == local->hw.conf.channel)
 981                                 wk_ct = ieee80211_calc_ct(wk->chan_type,
 982                                                 local->hw.conf.channel_type);
 983
 984                         if (local->tmp_channel)
 985                                 if ((local->tmp_channel != wk->chan) ||
 986                                     (local->tmp_channel_type != wk_ct))
 987                                         tmp_chan_changed = true;
 988
 989                         local->tmp_channel = wk->chan;
 990                         local->tmp_channel_type = wk_ct;
 991                         /*
 992                          * Leave the station vifs in awake mode if they
 993                          * happen to be on the same channel as
 994                          * the requested channel.
 995                          */
 996                         on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
 997                         if (on_oper_chan != on_oper_chan2) {
 998                                 if (on_oper_chan2) {
 999                                         /* going off oper channel, PS too */
1000                                         ieee80211_offchannel_stop_vifs(local,
1001                                                                        true);
1002                                         ieee80211_hw_config(local, 0);
1003                                 } else {
1004                                         /* going on channel, but leave PS
1005                                          * off-channel. */
1006                                         ieee80211_hw_config(local, 0);
1007                                         ieee80211_offchannel_return(local,
1008                                                                     true,
1009                                                                     false);
1010                                 }
1011                         } else if (tmp_chan_changed)
1012                                 /* Still off-channel, but on some other
1013                                  * channel, so update hardware.
1014                                  * PS should already be off-channel.
1015                                  */
1016                                 ieee80211_hw_config(local, 0);
1017
1018                         started = true;
1019                         wk->timeout = jiffies;
1020                 }
1021
1022                 /* don't try to work with items that aren't started */
1023                 if (!started)
1024                         continue;
1025
1026                 if (time_is_after_jiffies(wk->timeout)) {
1027                         /*
1028                          * This work item isn't supposed to be worked on
1029                          * right now, but take care to adjust the timer
1030                          * properly.
1031                          */
1032                         run_again(local, wk->timeout);
1033                         continue;
1034                 }
1035
1036                 switch (wk->type) {
1037                 default:
1038                         WARN_ON(1);
1039                         /* nothing */
1040                         rma = WORK_ACT_NONE;
1041                         break;
1042                 case IEEE80211_WORK_ABORT:
1043                         rma = WORK_ACT_TIMEOUT;
1044                         break;
1045                 case IEEE80211_WORK_DIRECT_PROBE:
1046                         rma = ieee80211_direct_probe(wk);
1047                         break;
1048                 case IEEE80211_WORK_AUTH:
1049                         rma = ieee80211_authenticate(wk);
1050                         break;
1051                 case IEEE80211_WORK_ASSOC:
1052                         rma = ieee80211_associate(wk);
1053                         break;
1054                 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
1055                         rma = ieee80211_remain_on_channel_timeout(wk);
1056                         break;
1057                 case IEEE80211_WORK_OFFCHANNEL_TX:
1058                         rma = ieee80211_offchannel_tx(wk);
1059                         break;
1060                 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
1061                         rma = ieee80211_assoc_beacon_wait(wk);
1062                         break;
1063                 }
1064
1065                 wk->started = started;
1066
1067                 switch (rma) {
1068                 case WORK_ACT_NONE:
1069                         /* might have changed the timeout */
1070                         run_again(local, wk->timeout);
1071                         break;
1072                 case WORK_ACT_TIMEOUT:
1073                         list_del_rcu(&wk->list);
1074                         synchronize_rcu();
1075                         list_add(&wk->list, &free_work);
1076                         break;
1077                 default:
1078                         WARN(1, "unexpected: %d", rma);
1079                 }
1080         }
1081
1082         list_for_each_entry(wk, &local->work_list, list) {
1083                 if (!wk->started)
1084                         continue;
1085                 if (wk->chan != local->tmp_channel)
1086                         continue;
1087                 if (ieee80211_work_ct_coexists(wk->chan_type,
1088                                                local->tmp_channel_type))
1089                         continue;
1090                 remain_off_channel = true;
1091         }
1092
1093         if (!remain_off_channel && local->tmp_channel) {
1094                 bool on_oper_chan = ieee80211_cfg_on_oper_channel(local);
1095                 local->tmp_channel = NULL;
1096                 /* If tmp_channel wasn't operating channel, then
1097                  * we need to go back on-channel.
1098                  * NOTE:  If we can ever be here while scannning,
1099                  * or if the hw_config() channel config logic changes,
1100                  * then we may need to do a more thorough check to see if
1101                  * we still need to do a hardware config.  Currently,
1102                  * we cannot be here while scanning, however.
1103                  */
1104                 if (ieee80211_cfg_on_oper_channel(local) && !on_oper_chan)
1105                         ieee80211_hw_config(local, 0);
1106
1107                 /* At the least, we need to disable offchannel_ps,
1108                  * so just go ahead and run the entire offchannel
1109                  * return logic here.  We *could* skip enabling
1110                  * beaconing if we were already on-oper-channel
1111                  * as a future optimization.
1112                  */
1113                 ieee80211_offchannel_return(local, true, true);
1114
1115                 /* give connection some time to breathe */
1116                 run_again(local, jiffies + HZ/2);
1117         }
1118
1119         if (list_empty(&local->work_list) && local->scan_req &&
1120             !local->scanning)
1121                 ieee80211_queue_delayed_work(&local->hw,
1122                                              &local->scan_work,
1123                                              round_jiffies_relative(0));
1124
1125         ieee80211_recalc_idle(local);
1126
1127         mutex_unlock(&local->mtx);
1128
1129         list_for_each_entry_safe(wk, tmp, &free_work, list) {
1130                 wk->done(wk, NULL);
1131                 list_del(&wk->list);
1132                 kfree(wk);
1133         }
1134 }
1135
1136 void ieee80211_add_work(struct ieee80211_work *wk)
1137 {
1138         struct ieee80211_local *local;
1139
1140         if (WARN_ON(!wk->chan))
1141                 return;
1142
1143         if (WARN_ON(!wk->sdata))
1144                 return;
1145
1146         if (WARN_ON(!wk->done))
1147                 return;
1148
1149         if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1150                 return;
1151
1152         wk->started = false;
1153
1154         local = wk->sdata->local;
1155         mutex_lock(&local->mtx);
1156         list_add_tail(&wk->list, &local->work_list);
1157         mutex_unlock(&local->mtx);
1158
1159         ieee80211_queue_work(&local->hw, &local->work_work);
1160 }
1161
1162 void ieee80211_work_init(struct ieee80211_local *local)
1163 {
1164         INIT_LIST_HEAD(&local->work_list);
1165         setup_timer(&local->work_timer, ieee80211_work_timer,
1166                     (unsigned long)local);
1167         INIT_WORK(&local->work_work, ieee80211_work_work);
1168         skb_queue_head_init(&local->work_skb_queue);
1169 }
1170
1171 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1172 {
1173         struct ieee80211_local *local = sdata->local;
1174         struct ieee80211_work *wk;
1175         bool cleanup = false;
1176
1177         mutex_lock(&local->mtx);
1178         list_for_each_entry(wk, &local->work_list, list) {
1179                 if (wk->sdata != sdata)
1180                         continue;
1181                 cleanup = true;
1182                 wk->type = IEEE80211_WORK_ABORT;
1183                 wk->started = true;
1184                 wk->timeout = jiffies;
1185         }
1186         mutex_unlock(&local->mtx);
1187
1188         /* run cleanups etc. */
1189         if (cleanup)
1190                 ieee80211_work_work(&local->work_work);
1191
1192         mutex_lock(&local->mtx);
1193         list_for_each_entry(wk, &local->work_list, list) {
1194                 if (wk->sdata != sdata)
1195                         continue;
1196                 WARN_ON(1);
1197                 break;
1198         }
1199         mutex_unlock(&local->mtx);
1200 }
1201
1202 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1203                                            struct sk_buff *skb)
1204 {
1205         struct ieee80211_local *local = sdata->local;
1206         struct ieee80211_mgmt *mgmt;
1207         struct ieee80211_work *wk;
1208         u16 fc;
1209
1210         if (skb->len < 24)
1211                 return RX_DROP_MONITOR;
1212
1213         mgmt = (struct ieee80211_mgmt *) skb->data;
1214         fc = le16_to_cpu(mgmt->frame_control);
1215
1216         list_for_each_entry_rcu(wk, &local->work_list, list) {
1217                 if (sdata != wk->sdata)
1218                         continue;
1219                 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1220                         continue;
1221                 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1222                         continue;
1223
1224                 switch (fc & IEEE80211_FCTL_STYPE) {
1225                 case IEEE80211_STYPE_AUTH:
1226                 case IEEE80211_STYPE_PROBE_RESP:
1227                 case IEEE80211_STYPE_ASSOC_RESP:
1228                 case IEEE80211_STYPE_REASSOC_RESP:
1229                 case IEEE80211_STYPE_BEACON:
1230                         skb_queue_tail(&local->work_skb_queue, skb);
1231                         ieee80211_queue_work(&local->hw, &local->work_work);
1232                         return RX_QUEUED;
1233                 }
1234         }
1235
1236         return RX_CONTINUE;
1237 }
1238
1239 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1240                                                    struct sk_buff *skb)
1241 {
1242         /*
1243          * We are done serving the remain-on-channel command.
1244          */
1245         cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1246                                            wk->chan, wk->chan_type,
1247                                            GFP_KERNEL);
1248
1249         return WORK_DONE_DESTROY;
1250 }
1251
1252 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1253                                    struct ieee80211_channel *chan,
1254                                    enum nl80211_channel_type channel_type,
1255                                    unsigned int duration, u64 *cookie)
1256 {
1257         struct ieee80211_work *wk;
1258
1259         wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1260         if (!wk)
1261                 return -ENOMEM;
1262
1263         wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1264         wk->chan = chan;
1265         wk->chan_type = channel_type;
1266         wk->sdata = sdata;
1267         wk->done = ieee80211_remain_done;
1268
1269         wk->remain.duration = duration;
1270
1271         *cookie = (unsigned long) wk;
1272
1273         ieee80211_add_work(wk);
1274
1275         return 0;
1276 }
1277
1278 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1279                                           u64 cookie)
1280 {
1281         struct ieee80211_local *local = sdata->local;
1282         struct ieee80211_work *wk, *tmp;
1283         bool found = false;
1284
1285         mutex_lock(&local->mtx);
1286         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1287                 if ((unsigned long) wk == cookie) {
1288                         wk->timeout = jiffies;
1289                         found = true;
1290                         break;
1291                 }
1292         }
1293         mutex_unlock(&local->mtx);
1294
1295         if (!found)
1296                 return -ENOENT;
1297
1298         ieee80211_queue_work(&local->hw, &local->work_work);
1299
1300         return 0;
1301 }