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
 107         if (!sband->ht_cap.ht_supported)
 108                 return;
 109
 110         if (!ht_info_ie)
 111                 return;
 112
 113         if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
 114                 return;
 115
 116         ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
 117
 118         /* determine capability flags */
 119
 120         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 121         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 122                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 123                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 124                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 125                 }
 126                 break;
 127         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 128                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 129                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 130                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 131                 }
 132                 break;
 133         }
 134
 135         /* set SM PS mode properly */
 136         cap &= ~IEEE80211_HT_CAP_SM_PS;
 137         switch (smps) {
 138         case IEEE80211_SMPS_AUTOMATIC:
 139         case IEEE80211_SMPS_NUM_MODES:
 140                 WARN_ON(1);
 141         case IEEE80211_SMPS_OFF:
 142                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 143                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 144                 break;
 145         case IEEE80211_SMPS_STATIC:
 146                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 147                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 148                 break;
 149         case IEEE80211_SMPS_DYNAMIC:
 150                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 151                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 152                 break;
 153         }
 154
 155         /* reserve and fill IE */
 156         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 157         ieee80211_ie_build_ht_cap(pos, sband, cap);
 158 }
 159
 160 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 161                                  struct ieee80211_work *wk)
 162 {
 163         struct ieee80211_local *local = sdata->local;
 164         struct sk_buff *skb;
 165         struct ieee80211_mgmt *mgmt;
 166         u8 *pos, qos_info;
 167         size_t offset = 0, noffset;
 168         int i, count, rates_len, supp_rates_len;
 169         u16 capab;
 170         struct ieee80211_supported_band *sband;
 171         u32 rates = 0;
 172
 173         sband = local->hw.wiphy->bands[wk->chan->band];
 174
 175         if (wk->assoc.supp_rates_len) {
 176                 /*
 177                  * Get all rates supported by the device and the AP as
 178                  * some APs don't like getting a superset of their rates
 179                  * in the association request (e.g. D-Link DAP 1353 in
 180                  * b-only mode)...
 181                  */
 182                 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
 183                                                        wk->assoc.supp_rates_len,
 184                                                        sband, &rates);
 185         } else {
 186                 /*
 187                  * In case AP not provide any supported rates information
 188                  * before association, we send information element(s) with
 189                  * all rates that we support.
 190                  */
 191                 rates = ~0;
 192                 rates_len = sband->n_bitrates;
 193         }
 194
 195         skb = alloc_skb(local->hw.extra_tx_headroom +
 196                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 197                         2 + wk->assoc.ssid_len + /* SSID */
 198                         4 + rates_len + /* (extended) rates */
 199                         4 + /* power capability */
 200                         2 + 2 * sband->n_channels + /* supported channels */
 201                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 202                         wk->ie_len + /* extra IEs */
 203                         9, /* WMM */
 204                         GFP_KERNEL);
 205         if (!skb)
 206                 return;
 207
 208         skb_reserve(skb, local->hw.extra_tx_headroom);
 209
 210         capab = WLAN_CAPABILITY_ESS;
 211
 212         if (sband->band == IEEE80211_BAND_2GHZ) {
 213                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 214                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 215                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 216                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 217         }
 218
 219         if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
 220                 capab |= WLAN_CAPABILITY_PRIVACY;
 221
 222         if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 223             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 224                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 225
 226         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 227         memset(mgmt, 0, 24);
 228         memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
 229         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 230         memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
 231
 232         if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
 233                 skb_put(skb, 10);
 234                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 235                                                   IEEE80211_STYPE_REASSOC_REQ);
 236                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 237                 mgmt->u.reassoc_req.listen_interval =
 238                                 cpu_to_le16(local->hw.conf.listen_interval);
 239                 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
 240                        ETH_ALEN);
 241         } else {
 242                 skb_put(skb, 4);
 243                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 244                                                   IEEE80211_STYPE_ASSOC_REQ);
 245                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 246                 mgmt->u.assoc_req.listen_interval =
 247                                 cpu_to_le16(local->hw.conf.listen_interval);
 248         }
 249
 250         /* SSID */
 251         pos = skb_put(skb, 2 + wk->assoc.ssid_len);
 252         *pos++ = WLAN_EID_SSID;
 253         *pos++ = wk->assoc.ssid_len;
 254         memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
 255
 256         /* add all rates which were marked to be used above */
 257         supp_rates_len = rates_len;
 258         if (supp_rates_len > 8)
 259                 supp_rates_len = 8;
 260
 261         pos = skb_put(skb, supp_rates_len + 2);
 262         *pos++ = WLAN_EID_SUPP_RATES;
 263         *pos++ = supp_rates_len;
 264
 265         count = 0;
 266         for (i = 0; i < sband->n_bitrates; i++) {
 267                 if (BIT(i) & rates) {
 268                         int rate = sband->bitrates[i].bitrate;
 269                         *pos++ = (u8) (rate / 5);
 270                         if (++count == 8)
 271                                 break;
 272                 }
 273         }
 274
 275         if (rates_len > count) {
 276                 pos = skb_put(skb, rates_len - count + 2);
 277                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 278                 *pos++ = rates_len - count;
 279
 280                 for (i++; i < sband->n_bitrates; i++) {
 281                         if (BIT(i) & rates) {
 282                                 int rate = sband->bitrates[i].bitrate;
 283                                 *pos++ = (u8) (rate / 5);
 284                         }
 285                 }
 286         }
 287
 288         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 289                 /* 1. power capabilities */
 290                 pos = skb_put(skb, 4);
 291                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 292                 *pos++ = 2;
 293                 *pos++ = 0; /* min tx power */
 294                 *pos++ = wk->chan->max_power; /* max tx power */
 295
 296                 /* 2. supported channels */
 297                 /* TODO: get this in reg domain format */
 298                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 299                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 300                 *pos++ = 2 * sband->n_channels;
 301                 for (i = 0; i < sband->n_channels; i++) {
 302                         *pos++ = ieee80211_frequency_to_channel(
 303                                         sband->channels[i].center_freq);
 304                         *pos++ = 1; /* one channel in the subband*/
 305                 }
 306         }
 307
 308         /* if present, add any custom IEs that go before HT */
 309         if (wk->ie_len && wk->ie) {
 310                 static const u8 before_ht[] = {
 311                         WLAN_EID_SSID,
 312                         WLAN_EID_SUPP_RATES,
 313                         WLAN_EID_EXT_SUPP_RATES,
 314                         WLAN_EID_PWR_CAPABILITY,
 315                         WLAN_EID_SUPPORTED_CHANNELS,
 316                         WLAN_EID_RSN,
 317                         WLAN_EID_QOS_CAPA,
 318                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 319                         WLAN_EID_MOBILITY_DOMAIN,
 320                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 321                 };
 322                 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
 323                                              before_ht, ARRAY_SIZE(before_ht),
 324                                              offset);
 325                 pos = skb_put(skb, noffset - offset);
 326                 memcpy(pos, wk->ie + offset, noffset - offset);
 327                 offset = noffset;
 328         }
 329
 330         if (wk->assoc.use_11n && wk->assoc.wmm_used &&
 331             local->hw.queues >= 4)
 332                 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
 333                                     sband, wk->chan, wk->assoc.smps);
 334
 335         /* if present, add any custom non-vendor IEs that go after HT */
 336         if (wk->ie_len && wk->ie) {
 337                 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
 338                                                     offset);
 339                 pos = skb_put(skb, noffset - offset);
 340                 memcpy(pos, wk->ie + offset, noffset - offset);
 341                 offset = noffset;
 342         }
 343
 344         if (wk->assoc.wmm_used && local->hw.queues >= 4) {
 345                 if (wk->assoc.uapsd_used) {
 346                         qos_info = local->uapsd_queues;
 347                         qos_info |= (local->uapsd_max_sp_len <<
 348                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 349                 } else {
 350                         qos_info = 0;
 351                 }
 352
 353                 pos = skb_put(skb, 9);
 354                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 355                 *pos++ = 7; /* len */
 356                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 357                 *pos++ = 0x50;
 358                 *pos++ = 0xf2;
 359                 *pos++ = 2; /* WME */
 360                 *pos++ = 0; /* WME info */
 361                 *pos++ = 1; /* WME ver */
 362                 *pos++ = qos_info;
 363         }
 364
 365         /* add any remaining custom (i.e. vendor specific here) IEs */
 366         if (wk->ie_len && wk->ie) {
 367                 noffset = wk->ie_len;
 368                 pos = skb_put(skb, noffset - offset);
 369                 memcpy(pos, wk->ie + offset, noffset - offset);
 370         }
 371
 372         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 373         ieee80211_tx_skb(sdata, skb);
 374 }
 375
 376 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
 377                                       struct ieee80211_work *wk)
 378 {
 379         struct cfg80211_bss *cbss;
 380         u16 capa_val = WLAN_CAPABILITY_ESS;
 381
 382         if (wk->probe_auth.privacy)
 383                 capa_val |= WLAN_CAPABILITY_PRIVACY;
 384
 385         cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
 386                                 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
 387                                 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 388                                 capa_val);
 389         if (!cbss)
 390                 return;
 391
 392         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 393         cfg80211_put_bss(cbss);
 394 }
 395
 396 static enum work_action __must_check
 397 ieee80211_direct_probe(struct ieee80211_work *wk)
 398 {
 399         struct ieee80211_sub_if_data *sdata = wk->sdata;
 400         struct ieee80211_local *local = sdata->local;
 401
 402         if (!wk->probe_auth.synced) {
 403                 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
 404                                       IEEE80211_TX_SYNC_AUTH);
 405                 if (ret)
 406                         return WORK_ACT_TIMEOUT;
 407         }
 408         wk->probe_auth.synced = true;
 409
 410         wk->probe_auth.tries++;
 411         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
 412                 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
 413                        sdata->name, wk->filter_ta);
 414
 415                 /*
 416                  * Most likely AP is not in the range so remove the
 417                  * bss struct for that AP.
 418                  */
 419                 ieee80211_remove_auth_bss(local, wk);
 420
 421                 return WORK_ACT_TIMEOUT;
 422         }
 423
 424         printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
 425                sdata->name, wk->filter_ta, wk->probe_auth.tries,
 426                IEEE80211_AUTH_MAX_TRIES);
 427
 428         /*
 429          * Direct probe is sent to broadcast address as some APs
 430          * will not answer to direct packet in unassociated state.
 431          */
 432         ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
 433                                  wk->probe_auth.ssid_len, NULL, 0,
 434                                  (u32) -1, true, false);
 435
 436         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 437         run_again(local, wk->timeout);
 438
 439         return WORK_ACT_NONE;
 440 }
 441
 442
 443 static enum work_action __must_check
 444 ieee80211_authenticate(struct ieee80211_work *wk)
 445 {
 446         struct ieee80211_sub_if_data *sdata = wk->sdata;
 447         struct ieee80211_local *local = sdata->local;
 448
 449         if (!wk->probe_auth.synced) {
 450                 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
 451                                       IEEE80211_TX_SYNC_AUTH);
 452                 if (ret)
 453                         return WORK_ACT_TIMEOUT;
 454         }
 455         wk->probe_auth.synced = true;
 456
 457         wk->probe_auth.tries++;
 458         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
 459                 printk(KERN_DEBUG "%s: authentication with %pM"
 460                        " timed out\n", sdata->name, wk->filter_ta);
 461
 462                 /*
 463                  * Most likely AP is not in the range so remove the
 464                  * bss struct for that AP.
 465                  */
 466                 ieee80211_remove_auth_bss(local, wk);
 467
 468                 return WORK_ACT_TIMEOUT;
 469         }
 470
 471         printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
 472                sdata->name, wk->filter_ta, wk->probe_auth.tries);
 473
 474         ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
 475                             wk->ie_len, wk->filter_ta, NULL, 0, 0);
 476         wk->probe_auth.transaction = 2;
 477
 478         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 479         run_again(local, wk->timeout);
 480
 481         return WORK_ACT_NONE;
 482 }
 483
 484 static enum work_action __must_check
 485 ieee80211_associate(struct ieee80211_work *wk)
 486 {
 487         struct ieee80211_sub_if_data *sdata = wk->sdata;
 488         struct ieee80211_local *local = sdata->local;
 489
 490         if (!wk->assoc.synced) {
 491                 int ret = drv_tx_sync(local, sdata, wk->filter_ta,
 492                                       IEEE80211_TX_SYNC_ASSOC);
 493                 if (ret)
 494                         return WORK_ACT_TIMEOUT;
 495         }
 496         wk->assoc.synced = true;
 497
 498         wk->assoc.tries++;
 499         if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
 500                 printk(KERN_DEBUG "%s: association with %pM"
 501                        " timed out\n",
 502                        sdata->name, wk->filter_ta);
 503
 504                 /*
 505                  * Most likely AP is not in the range so remove the
 506                  * bss struct for that AP.
 507                  */
 508                 if (wk->assoc.bss)
 509                         cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
 510
 511                 return WORK_ACT_TIMEOUT;
 512         }
 513
 514         printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
 515                sdata->name, wk->filter_ta, wk->assoc.tries);
 516         ieee80211_send_assoc(sdata, wk);
 517
 518         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
 519         run_again(local, wk->timeout);
 520
 521         return WORK_ACT_NONE;
 522 }
 523
 524 static enum work_action __must_check
 525 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
 526 {
 527         /*
 528          * First time we run, do nothing -- the generic code will
 529          * have switched to the right channel etc.
 530          */
 531         if (!wk->started) {
 532                 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
 533
 534                 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
 535                                           wk->chan, wk->chan_type,
 536                                           wk->remain.duration, GFP_KERNEL);
 537
 538                 return WORK_ACT_NONE;
 539         }
 540
 541         return WORK_ACT_TIMEOUT;
 542 }
 543
 544 static enum work_action __must_check
 545 ieee80211_offchannel_tx(struct ieee80211_work *wk)
 546 {
 547         if (!wk->started) {
 548                 wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
 549
 550                 /*
 551                  * After this, offchan_tx.frame remains but now is no
 552                  * longer a valid pointer -- we still need it as the
 553                  * cookie for canceling this work/status matching.
 554                  */
 555                 ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
 556
 557                 return WORK_ACT_NONE;
 558         }
 559
 560         return WORK_ACT_TIMEOUT;
 561 }
 562
 563 static enum work_action __must_check
 564 ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
 565 {
 566         if (wk->started)
 567                 return WORK_ACT_TIMEOUT;
 568
 569         /*
 570          * Wait up to one beacon interval ...
 571          * should this be more if we miss one?
 572          */
 573         printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
 574                wk->sdata->name, wk->filter_ta);
 575         wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
 576         return WORK_ACT_NONE;
 577 }
 578
 579 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
 580                                      struct ieee80211_mgmt *mgmt,
 581                                      size_t len)
 582 {
 583         struct ieee80211_sub_if_data *sdata = wk->sdata;
 584         u8 *pos;
 585         struct ieee802_11_elems elems;
 586
 587         pos = mgmt->u.auth.variable;
 588         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 589         if (!elems.challenge)
 590                 return;
 591         ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
 592                             elems.challenge - 2, elems.challenge_len + 2,
 593                             wk->filter_ta, wk->probe_auth.key,
 594                             wk->probe_auth.key_len, wk->probe_auth.key_idx);
 595         wk->probe_auth.transaction = 4;
 596 }
 597
 598 static enum work_action __must_check
 599 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
 600                        struct ieee80211_mgmt *mgmt, size_t len)
 601 {
 602         u16 auth_alg, auth_transaction, status_code;
 603
 604         if (wk->type != IEEE80211_WORK_AUTH)
 605                 return WORK_ACT_MISMATCH;
 606
 607         if (len < 24 + 6)
 608                 return WORK_ACT_NONE;
 609
 610         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 611         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 612         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 613
 614         if (auth_alg != wk->probe_auth.algorithm ||
 615             auth_transaction != wk->probe_auth.transaction)
 616                 return WORK_ACT_NONE;
 617
 618         if (status_code != WLAN_STATUS_SUCCESS) {
 619                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
 620                        wk->sdata->name, mgmt->sa, status_code);
 621                 return WORK_ACT_DONE;
 622         }
 623
 624         switch (wk->probe_auth.algorithm) {
 625         case WLAN_AUTH_OPEN:
 626         case WLAN_AUTH_LEAP:
 627         case WLAN_AUTH_FT:
 628                 break;
 629         case WLAN_AUTH_SHARED_KEY:
 630                 if (wk->probe_auth.transaction != 4) {
 631                         ieee80211_auth_challenge(wk, mgmt, len);
 632                         /* need another frame */
 633                         return WORK_ACT_NONE;
 634                 }
 635                 break;
 636         default:
 637                 WARN_ON(1);
 638                 return WORK_ACT_NONE;
 639         }
 640
 641         printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
 642         return WORK_ACT_DONE;
 643 }
 644
 645 static enum work_action __must_check
 646 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
 647                              struct ieee80211_mgmt *mgmt, size_t len,
 648                              bool reassoc)
 649 {
 650         struct ieee80211_sub_if_data *sdata = wk->sdata;
 651         struct ieee80211_local *local = sdata->local;
 652         u16 capab_info, status_code, aid;
 653         struct ieee802_11_elems elems;
 654         u8 *pos;
 655
 656         if (wk->type != IEEE80211_WORK_ASSOC)
 657                 return WORK_ACT_MISMATCH;
 658
 659         /*
 660          * AssocResp and ReassocResp have identical structure, so process both
 661          * of them in this function.
 662          */
 663
 664         if (len < 24 + 6)
 665                 return WORK_ACT_NONE;
 666
 667         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
 668         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
 669         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
 670
 671         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
 672                "status=%d aid=%d)\n",
 673                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
 674                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
 675
 676         pos = mgmt->u.assoc_resp.variable;
 677         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 678
 679         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
 680             elems.timeout_int && elems.timeout_int_len == 5 &&
 681             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
 682                 u32 tu, ms;
 683                 tu = get_unaligned_le32(elems.timeout_int + 1);
 684                 ms = tu * 1024 / 1000;
 685                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
 686                        "comeback duration %u TU (%u ms)\n",
 687                        sdata->name, mgmt->sa, tu, ms);
 688                 wk->timeout = jiffies + msecs_to_jiffies(ms);
 689                 if (ms > IEEE80211_ASSOC_TIMEOUT)
 690                         run_again(local, wk->timeout);
 691                 return WORK_ACT_NONE;
 692         }
 693
 694         if (status_code != WLAN_STATUS_SUCCESS)
 695                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
 696                        sdata->name, mgmt->sa, status_code);
 697         else
 698                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
 699
 700         return WORK_ACT_DONE;
 701 }
 702
 703 static enum work_action __must_check
 704 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
 705                              struct ieee80211_mgmt *mgmt, size_t len,
 706                              struct ieee80211_rx_status *rx_status)
 707 {
 708         struct ieee80211_sub_if_data *sdata = wk->sdata;
 709         struct ieee80211_local *local = sdata->local;
 710         size_t baselen;
 711
 712         ASSERT_WORK_MTX(local);
 713
 714         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
 715                 return WORK_ACT_MISMATCH;
 716
 717         if (len < 24 + 12)
 718                 return WORK_ACT_NONE;
 719
 720         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 721         if (baselen > len)
 722                 return WORK_ACT_NONE;
 723
 724         printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
 725         return WORK_ACT_DONE;
 726 }
 727
 728 static enum work_action __must_check
 729 ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
 730                          struct ieee80211_mgmt *mgmt, size_t len)
 731 {
 732         struct ieee80211_sub_if_data *sdata = wk->sdata;
 733         struct ieee80211_local *local = sdata->local;
 734
 735         ASSERT_WORK_MTX(local);
 736
 737         if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
 738                 return WORK_ACT_MISMATCH;
 739
 740         if (len < 24 + 12)
 741                 return WORK_ACT_NONE;
 742
 743         printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
 744         return WORK_ACT_DONE;
 745 }
 746
 747 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
 748                                           struct sk_buff *skb)
 749 {
 750         struct ieee80211_rx_status *rx_status;
 751         struct ieee80211_mgmt *mgmt;
 752         struct ieee80211_work *wk;
 753         enum work_action rma = WORK_ACT_NONE;
 754         u16 fc;
 755
 756         rx_status = (struct ieee80211_rx_status *) skb->cb;
 757         mgmt = (struct ieee80211_mgmt *) skb->data;
 758         fc = le16_to_cpu(mgmt->frame_control);
 759
 760         mutex_lock(&local->mtx);
 761
 762         list_for_each_entry(wk, &local->work_list, list) {
 763                 const u8 *bssid = NULL;
 764
 765                 switch (wk->type) {
 766                 case IEEE80211_WORK_DIRECT_PROBE:
 767                 case IEEE80211_WORK_AUTH:
 768                 case IEEE80211_WORK_ASSOC:
 769                 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
 770                         bssid = wk->filter_ta;
 771                         break;
 772                 default:
 773                         continue;
 774                 }
 775
 776                 /*
 777                  * Before queuing, we already verified mgmt->sa,
 778                  * so this is needed just for matching.
 779                  */
 780                 if (compare_ether_addr(bssid, mgmt->bssid))
 781                         continue;
 782
 783                 switch (fc & IEEE80211_FCTL_STYPE) {
 784                 case IEEE80211_STYPE_BEACON:
 785                         rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
 786                         break;
 787                 case IEEE80211_STYPE_PROBE_RESP:
 788                         rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
 789                                                            rx_status);
 790                         break;
 791                 case IEEE80211_STYPE_AUTH:
 792                         rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
 793                         break;
 794                 case IEEE80211_STYPE_ASSOC_RESP:
 795                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
 796                                                            skb->len, false);
 797                         break;
 798                 case IEEE80211_STYPE_REASSOC_RESP:
 799                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
 800                                                            skb->len, true);
 801                         break;
 802                 default:
 803                         WARN_ON(1);
 804                         rma = WORK_ACT_NONE;
 805                 }
 806
 807                 /*
 808                  * We've either received an unexpected frame, or we have
 809                  * multiple work items and need to match the frame to the
 810                  * right one.
 811                  */
 812                 if (rma == WORK_ACT_MISMATCH)
 813                         continue;
 814
 815                 /*
 816                  * We've processed this frame for that work, so it can't
 817                  * belong to another work struct.
 818                  * NB: this is also required for correctness for 'rma'!
 819                  */
 820                 break;
 821         }
 822
 823         switch (rma) {
 824         case WORK_ACT_MISMATCH:
 825                 /* ignore this unmatched frame */
 826                 break;
 827         case WORK_ACT_NONE:
 828                 break;
 829         case WORK_ACT_DONE:
 830                 list_del_rcu(&wk->list);
 831                 break;
 832         default:
 833                 WARN(1, "unexpected: %d", rma);
 834         }
 835
 836         mutex_unlock(&local->mtx);
 837
 838         if (rma != WORK_ACT_DONE)
 839                 goto out;
 840
 841         switch (wk->done(wk, skb)) {
 842         case WORK_DONE_DESTROY:
 843                 free_work(wk);
 844                 break;
 845         case WORK_DONE_REQUEUE:
 846                 synchronize_rcu();
 847                 wk->started = false; /* restart */
 848                 mutex_lock(&local->mtx);
 849                 list_add_tail(&wk->list, &local->work_list);
 850                 mutex_unlock(&local->mtx);
 851         }
 852
 853  out:
 854         kfree_skb(skb);
 855 }
 856
 857 static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
 858                                        enum nl80211_channel_type oper_ct)
 859 {
 860         switch (wk_ct) {
 861         case NL80211_CHAN_NO_HT:
 862                 return true;
 863         case NL80211_CHAN_HT20:
 864                 if (oper_ct != NL80211_CHAN_NO_HT)
 865                         return true;
 866                 return false;
 867         case NL80211_CHAN_HT40MINUS:
 868         case NL80211_CHAN_HT40PLUS:
 869                 return (wk_ct == oper_ct);
 870         }
 871         WARN_ON(1); /* shouldn't get here */
 872         return false;
 873 }
 874
 875 static enum nl80211_channel_type
 876 ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
 877                   enum nl80211_channel_type oper_ct)
 878 {
 879         switch (wk_ct) {
 880         case NL80211_CHAN_NO_HT:
 881                 return oper_ct;
 882         case NL80211_CHAN_HT20:
 883                 if (oper_ct != NL80211_CHAN_NO_HT)
 884                         return oper_ct;
 885                 return wk_ct;
 886         case NL80211_CHAN_HT40MINUS:
 887         case NL80211_CHAN_HT40PLUS:
 888                 return wk_ct;
 889         }
 890         WARN_ON(1); /* shouldn't get here */
 891         return wk_ct;
 892 }
 893
 894
 895 static void ieee80211_work_timer(unsigned long data)
 896 {
 897         struct ieee80211_local *local = (void *) data;
 898
 899         if (local->quiescing)
 900                 return;
 901
 902         ieee80211_queue_work(&local->hw, &local->work_work);
 903 }
 904
 905 static void ieee80211_work_work(struct work_struct *work)
 906 {
 907         struct ieee80211_local *local =
 908                 container_of(work, struct ieee80211_local, work_work);
 909         struct sk_buff *skb;
 910         struct ieee80211_work *wk, *tmp;
 911         LIST_HEAD(free_work);
 912         enum work_action rma;
 913         bool remain_off_channel = false;
 914
 915         if (local->scanning)
 916                 return;
 917
 918         /*
 919          * ieee80211_queue_work() should have picked up most cases,
 920          * here we'll pick the rest.
 921          */
 922         if (WARN(local->suspended, "work scheduled while going to suspend\n"))
 923                 return;
 924
 925         /* first process frames to avoid timing out while a frame is pending */
 926         while ((skb = skb_dequeue(&local->work_skb_queue)))
 927                 ieee80211_work_rx_queued_mgmt(local, skb);
 928
 929         mutex_lock(&local->mtx);
 930
 931         ieee80211_recalc_idle(local);
 932
 933         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
 934                 bool started = wk->started;
 935
 936                 /* mark work as started if it's on the current off-channel */
 937                 if (!started && local->tmp_channel &&
 938                     wk->chan == local->tmp_channel &&
 939                     wk->chan_type == local->tmp_channel_type) {
 940                         started = true;
 941                         wk->timeout = jiffies;
 942                 }
 943
 944                 if (!started && !local->tmp_channel) {
 945                         bool on_oper_chan;
 946                         bool tmp_chan_changed = false;
 947                         bool on_oper_chan2;
 948                         enum nl80211_channel_type wk_ct;
 949                         on_oper_chan = ieee80211_cfg_on_oper_channel(local);
 950
 951                         /* Work with existing channel type if possible. */
 952                         wk_ct = wk->chan_type;
 953                         if (wk->chan == local->hw.conf.channel)
 954                                 wk_ct = ieee80211_calc_ct(wk->chan_type,
 955                                                 local->hw.conf.channel_type);
 956
 957                         if (local->tmp_channel)
 958                                 if ((local->tmp_channel != wk->chan) ||
 959                                     (local->tmp_channel_type != wk_ct))
 960                                         tmp_chan_changed = true;
 961
 962                         local->tmp_channel = wk->chan;
 963                         local->tmp_channel_type = wk_ct;
 964                         /*
 965                          * Leave the station vifs in awake mode if they
 966                          * happen to be on the same channel as
 967                          * the requested channel.
 968                          */
 969                         on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
 970                         if (on_oper_chan != on_oper_chan2) {
 971                                 if (on_oper_chan2) {
 972                                         /* going off oper channel, PS too */
 973                                         ieee80211_offchannel_stop_vifs(local,
 974                                                                        true);
 975                                         ieee80211_hw_config(local, 0);
 976                                 } else {
 977                                         /* going on channel, but leave PS
 978                                          * off-channel. */
 979                                         ieee80211_hw_config(local, 0);
 980                                         ieee80211_offchannel_return(local,
 981                                                                     true,
 982                                                                     false);
 983                                 }
 984                         } else if (tmp_chan_changed)
 985                                 /* Still off-channel, but on some other
 986                                  * channel, so update hardware.
 987                                  * PS should already be off-channel.
 988                                  */
 989                                 ieee80211_hw_config(local, 0);
 990
 991                         started = true;
 992                         wk->timeout = jiffies;
 993                 }
 994
 995                 /* don't try to work with items that aren't started */
 996                 if (!started)
 997                         continue;
 998
 999                 if (time_is_after_jiffies(wk->timeout)) {
1000                         /*
1001                          * This work item isn't supposed to be worked on
1002                          * right now, but take care to adjust the timer
1003                          * properly.
1004                          */
1005                         run_again(local, wk->timeout);
1006                         continue;
1007                 }
1008
1009                 switch (wk->type) {
1010                 default:
1011                         WARN_ON(1);
1012                         /* nothing */
1013                         rma = WORK_ACT_NONE;
1014                         break;
1015                 case IEEE80211_WORK_ABORT:
1016                         rma = WORK_ACT_TIMEOUT;
1017                         break;
1018                 case IEEE80211_WORK_DIRECT_PROBE:
1019                         rma = ieee80211_direct_probe(wk);
1020                         break;
1021                 case IEEE80211_WORK_AUTH:
1022                         rma = ieee80211_authenticate(wk);
1023                         break;
1024                 case IEEE80211_WORK_ASSOC:
1025                         rma = ieee80211_associate(wk);
1026                         break;
1027                 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
1028                         rma = ieee80211_remain_on_channel_timeout(wk);
1029                         break;
1030                 case IEEE80211_WORK_OFFCHANNEL_TX:
1031                         rma = ieee80211_offchannel_tx(wk);
1032                         break;
1033                 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
1034                         rma = ieee80211_assoc_beacon_wait(wk);
1035                         break;
1036                 }
1037
1038                 wk->started = started;
1039
1040                 switch (rma) {
1041                 case WORK_ACT_NONE:
1042                         /* might have changed the timeout */
1043                         run_again(local, wk->timeout);
1044                         break;
1045                 case WORK_ACT_TIMEOUT:
1046                         list_del_rcu(&wk->list);
1047                         synchronize_rcu();
1048                         list_add(&wk->list, &free_work);
1049                         break;
1050                 default:
1051                         WARN(1, "unexpected: %d", rma);
1052                 }
1053         }
1054
1055         list_for_each_entry(wk, &local->work_list, list) {
1056                 if (!wk->started)
1057                         continue;
1058                 if (wk->chan != local->tmp_channel)
1059                         continue;
1060                 if (!ieee80211_work_ct_coexists(wk->chan_type,
1061                                                 local->tmp_channel_type))
1062                         continue;
1063                 remain_off_channel = true;
1064         }
1065
1066         if (!remain_off_channel && local->tmp_channel) {
1067                 local->tmp_channel = NULL;
1068                 /* If tmp_channel wasn't operating channel, then
1069                  * we need to go back on-channel.
1070                  * NOTE:  If we can ever be here while scannning,
1071                  * or if the hw_config() channel config logic changes,
1072                  * then we may need to do a more thorough check to see if
1073                  * we still need to do a hardware config.  Currently,
1074                  * we cannot be here while scanning, however.
1075                  */
1076                 if (!ieee80211_cfg_on_oper_channel(local))
1077                         ieee80211_hw_config(local, 0);
1078
1079                 /* At the least, we need to disable offchannel_ps,
1080                  * so just go ahead and run the entire offchannel
1081                  * return logic here.  We *could* skip enabling
1082                  * beaconing if we were already on-oper-channel
1083                  * as a future optimization.
1084                  */
1085                 ieee80211_offchannel_return(local, true, true);
1086
1087                 /* give connection some time to breathe */
1088                 run_again(local, jiffies + HZ/2);
1089         }
1090
1091         if (list_empty(&local->work_list) && local->scan_req &&
1092             !local->scanning)
1093                 ieee80211_queue_delayed_work(&local->hw,
1094                                              &local->scan_work,
1095                                              round_jiffies_relative(0));
1096
1097         ieee80211_recalc_idle(local);
1098
1099         mutex_unlock(&local->mtx);
1100
1101         list_for_each_entry_safe(wk, tmp, &free_work, list) {
1102                 wk->done(wk, NULL);
1103                 list_del(&wk->list);
1104                 kfree(wk);
1105         }
1106 }
1107
1108 void ieee80211_add_work(struct ieee80211_work *wk)
1109 {
1110         struct ieee80211_local *local;
1111
1112         if (WARN_ON(!wk->chan))
1113                 return;
1114
1115         if (WARN_ON(!wk->sdata))
1116                 return;
1117
1118         if (WARN_ON(!wk->done))
1119                 return;
1120
1121         if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1122                 return;
1123
1124         wk->started = false;
1125
1126         local = wk->sdata->local;
1127         mutex_lock(&local->mtx);
1128         list_add_tail(&wk->list, &local->work_list);
1129         mutex_unlock(&local->mtx);
1130
1131         ieee80211_queue_work(&local->hw, &local->work_work);
1132 }
1133
1134 void ieee80211_work_init(struct ieee80211_local *local)
1135 {
1136         INIT_LIST_HEAD(&local->work_list);
1137         setup_timer(&local->work_timer, ieee80211_work_timer,
1138                     (unsigned long)local);
1139         INIT_WORK(&local->work_work, ieee80211_work_work);
1140         skb_queue_head_init(&local->work_skb_queue);
1141 }
1142
1143 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1144 {
1145         struct ieee80211_local *local = sdata->local;
1146         struct ieee80211_work *wk;
1147         bool cleanup = false;
1148
1149         mutex_lock(&local->mtx);
1150         list_for_each_entry(wk, &local->work_list, list) {
1151                 if (wk->sdata != sdata)
1152                         continue;
1153                 cleanup = true;
1154                 wk->type = IEEE80211_WORK_ABORT;
1155                 wk->started = true;
1156                 wk->timeout = jiffies;
1157         }
1158         mutex_unlock(&local->mtx);
1159
1160         /* run cleanups etc. */
1161         if (cleanup)
1162                 ieee80211_work_work(&local->work_work);
1163
1164         mutex_lock(&local->mtx);
1165         list_for_each_entry(wk, &local->work_list, list) {
1166                 if (wk->sdata != sdata)
1167                         continue;
1168                 WARN_ON(1);
1169                 break;
1170         }
1171         mutex_unlock(&local->mtx);
1172 }
1173
1174 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1175                                            struct sk_buff *skb)
1176 {
1177         struct ieee80211_local *local = sdata->local;
1178         struct ieee80211_mgmt *mgmt;
1179         struct ieee80211_work *wk;
1180         u16 fc;
1181
1182         if (skb->len < 24)
1183                 return RX_DROP_MONITOR;
1184
1185         mgmt = (struct ieee80211_mgmt *) skb->data;
1186         fc = le16_to_cpu(mgmt->frame_control);
1187
1188         list_for_each_entry_rcu(wk, &local->work_list, list) {
1189                 if (sdata != wk->sdata)
1190                         continue;
1191                 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1192                         continue;
1193                 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1194                         continue;
1195
1196                 switch (fc & IEEE80211_FCTL_STYPE) {
1197                 case IEEE80211_STYPE_AUTH:
1198                 case IEEE80211_STYPE_PROBE_RESP:
1199                 case IEEE80211_STYPE_ASSOC_RESP:
1200                 case IEEE80211_STYPE_REASSOC_RESP:
1201                 case IEEE80211_STYPE_BEACON:
1202                         skb_queue_tail(&local->work_skb_queue, skb);
1203                         ieee80211_queue_work(&local->hw, &local->work_work);
1204                         return RX_QUEUED;
1205                 }
1206         }
1207
1208         return RX_CONTINUE;
1209 }
1210
1211 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1212                                                    struct sk_buff *skb)
1213 {
1214         /*
1215          * We are done serving the remain-on-channel command.
1216          */
1217         cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1218                                            wk->chan, wk->chan_type,
1219                                            GFP_KERNEL);
1220
1221         return WORK_DONE_DESTROY;
1222 }
1223
1224 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1225                                    struct ieee80211_channel *chan,
1226                                    enum nl80211_channel_type channel_type,
1227                                    unsigned int duration, u64 *cookie)
1228 {
1229         struct ieee80211_work *wk;
1230
1231         wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1232         if (!wk)
1233                 return -ENOMEM;
1234
1235         wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1236         wk->chan = chan;
1237         wk->chan_type = channel_type;
1238         wk->sdata = sdata;
1239         wk->done = ieee80211_remain_done;
1240
1241         wk->remain.duration = duration;
1242
1243         *cookie = (unsigned long) wk;
1244
1245         ieee80211_add_work(wk);
1246
1247         return 0;
1248 }
1249
1250 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1251                                           u64 cookie)
1252 {
1253         struct ieee80211_local *local = sdata->local;
1254         struct ieee80211_work *wk, *tmp;
1255         bool found = false;
1256
1257         mutex_lock(&local->mtx);
1258         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1259                 if ((unsigned long) wk == cookie) {
1260                         wk->timeout = jiffies;
1261                         found = true;
1262                         break;
1263                 }
1264         }
1265         mutex_unlock(&local->mtx);
1266
1267         if (!found)
1268                 return -ENOENT;
1269
1270         ieee80211_queue_work(&local->hw, &local->work_work);
1271
1272         return 0;
1273 }