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
  29 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  30 #define IEEE80211_AUTH_MAX_TRIES 3
  31 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  32 #define IEEE80211_ASSOC_MAX_TRIES 3
  33 #define IEEE80211_MAX_PROBE_TRIES 5
  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 static void work_free_rcu(struct rcu_head *head)
  70 {
  71         struct ieee80211_work *wk =
  72                 container_of(head, struct ieee80211_work, rcu_head);
  73
  74         kfree(wk);
  75 }
  76
  77 void free_work(struct ieee80211_work *wk)
  78 {
  79         call_rcu(&wk->rcu_head, work_free_rcu);
  80 }
  81
  82 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
  83                                       struct ieee80211_supported_band *sband,
  84                                       u32 *rates)
  85 {
  86         int i, j, count;
  87         *rates = 0;
  88         count = 0;
  89         for (i = 0; i < supp_rates_len; i++) {
  90                 int rate = (supp_rates[i] & 0x7F) * 5;
  91
  92                 for (j = 0; j < sband->n_bitrates; j++)
  93                         if (sband->bitrates[j].bitrate == rate) {
  94                                 *rates |= BIT(j);
  95                                 count++;
  96                                 break;
  97                         }
  98         }
  99
 100         return count;
 101 }
 102
 103 /* frame sending functions */
 104
 105 static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
 106                                 struct ieee80211_supported_band *sband,
 107                                 struct ieee80211_channel *channel,
 108                                 enum ieee80211_smps_mode smps)
 109 {
 110         struct ieee80211_ht_info *ht_info;
 111         u8 *pos;
 112         u32 flags = channel->flags;
 113         u16 cap = sband->ht_cap.cap;
 114         __le16 tmp;
 115
 116         if (!sband->ht_cap.ht_supported)
 117                 return;
 118
 119         if (!ht_info_ie)
 120                 return;
 121
 122         if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
 123                 return;
 124
 125         ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
 126
 127         /* determine capability flags */
 128
 129         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 130         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 131                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 132                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 133                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 134                 }
 135                 break;
 136         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 137                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 138                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 139                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 140                 }
 141                 break;
 142         }
 143
 144         /* set SM PS mode properly */
 145         cap &= ~IEEE80211_HT_CAP_SM_PS;
 146         switch (smps) {
 147         case IEEE80211_SMPS_AUTOMATIC:
 148         case IEEE80211_SMPS_NUM_MODES:
 149                 WARN_ON(1);
 150         case IEEE80211_SMPS_OFF:
 151                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 152                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 153                 break;
 154         case IEEE80211_SMPS_STATIC:
 155                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 156                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 157                 break;
 158         case IEEE80211_SMPS_DYNAMIC:
 159                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 160                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 161                 break;
 162         }
 163
 164         /* reserve and fill IE */
 165
 166         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 167         *pos++ = WLAN_EID_HT_CAPABILITY;
 168         *pos++ = sizeof(struct ieee80211_ht_cap);
 169         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 170
 171         /* capability flags */
 172         tmp = cpu_to_le16(cap);
 173         memcpy(pos, &tmp, sizeof(u16));
 174         pos += sizeof(u16);
 175
 176         /* AMPDU parameters */
 177         *pos++ = sband->ht_cap.ampdu_factor |
 178                  (sband->ht_cap.ampdu_density <<
 179                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 180
 181         /* MCS set */
 182         memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 183         pos += sizeof(sband->ht_cap.mcs);
 184
 185         /* extended capabilities */
 186         pos += sizeof(__le16);
 187
 188         /* BF capabilities */
 189         pos += sizeof(__le32);
 190
 191         /* antenna selection */
 192         pos += sizeof(u8);
 193 }
 194
 195 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 196                                  struct ieee80211_work *wk)
 197 {
 198         struct ieee80211_local *local = sdata->local;
 199         struct sk_buff *skb;
 200         struct ieee80211_mgmt *mgmt;
 201         u8 *pos, qos_info;
 202         const u8 *ies;
 203         size_t offset = 0, noffset;
 204         int i, len, count, rates_len, supp_rates_len;
 205         u16 capab;
 206         struct ieee80211_supported_band *sband;
 207         u32 rates = 0;
 208
 209         sband = local->hw.wiphy->bands[wk->chan->band];
 210
 211         if (wk->assoc.supp_rates_len) {
 212                 /*
 213                  * Get all rates supported by the device and the AP as
 214                  * some APs don't like getting a superset of their rates
 215                  * in the association request (e.g. D-Link DAP 1353 in
 216                  * b-only mode)...
 217                  */
 218                 rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
 219                                                        wk->assoc.supp_rates_len,
 220                                                        sband, &rates);
 221         } else {
 222                 /*
 223                  * In case AP not provide any supported rates information
 224                  * before association, we send information element(s) with
 225                  * all rates that we support.
 226                  */
 227                 rates = ~0;
 228                 rates_len = sband->n_bitrates;
 229         }
 230
 231         skb = alloc_skb(local->hw.extra_tx_headroom +
 232                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 233                         2 + wk->assoc.ssid_len + /* SSID */
 234                         4 + rates_len + /* (extended) rates */
 235                         4 + /* power capability */
 236                         2 + 2 * sband->n_channels + /* supported channels */
 237                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 238                         wk->ie_len + /* extra IEs */
 239                         9, /* WMM */
 240                         GFP_KERNEL);
 241         if (!skb) {
 242                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 243                        "frame\n", sdata->name);
 244                 return;
 245         }
 246         skb_reserve(skb, local->hw.extra_tx_headroom);
 247
 248         capab = WLAN_CAPABILITY_ESS;
 249
 250         if (sband->band == IEEE80211_BAND_2GHZ) {
 251                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 252                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 253                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 254                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 255         }
 256
 257         if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
 258                 capab |= WLAN_CAPABILITY_PRIVACY;
 259
 260         if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 261             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 262                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 263
 264         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 265         memset(mgmt, 0, 24);
 266         memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
 267         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 268         memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);
 269
 270         if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
 271                 skb_put(skb, 10);
 272                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 273                                                   IEEE80211_STYPE_REASSOC_REQ);
 274                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 275                 mgmt->u.reassoc_req.listen_interval =
 276                                 cpu_to_le16(local->hw.conf.listen_interval);
 277                 memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
 278                        ETH_ALEN);
 279         } else {
 280                 skb_put(skb, 4);
 281                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 282                                                   IEEE80211_STYPE_ASSOC_REQ);
 283                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 284                 mgmt->u.assoc_req.listen_interval =
 285                                 cpu_to_le16(local->hw.conf.listen_interval);
 286         }
 287
 288         /* SSID */
 289         ies = pos = skb_put(skb, 2 + wk->assoc.ssid_len);
 290         *pos++ = WLAN_EID_SSID;
 291         *pos++ = wk->assoc.ssid_len;
 292         memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);
 293
 294         /* add all rates which were marked to be used above */
 295         supp_rates_len = rates_len;
 296         if (supp_rates_len > 8)
 297                 supp_rates_len = 8;
 298
 299         len = sband->n_bitrates;
 300         pos = skb_put(skb, supp_rates_len + 2);
 301         *pos++ = WLAN_EID_SUPP_RATES;
 302         *pos++ = supp_rates_len;
 303
 304         count = 0;
 305         for (i = 0; i < sband->n_bitrates; i++) {
 306                 if (BIT(i) & rates) {
 307                         int rate = sband->bitrates[i].bitrate;
 308                         *pos++ = (u8) (rate / 5);
 309                         if (++count == 8)
 310                                 break;
 311                 }
 312         }
 313
 314         if (rates_len > count) {
 315                 pos = skb_put(skb, rates_len - count + 2);
 316                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 317                 *pos++ = rates_len - count;
 318
 319                 for (i++; i < sband->n_bitrates; i++) {
 320                         if (BIT(i) & rates) {
 321                                 int rate = sband->bitrates[i].bitrate;
 322                                 *pos++ = (u8) (rate / 5);
 323                         }
 324                 }
 325         }
 326
 327         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 328                 /* 1. power capabilities */
 329                 pos = skb_put(skb, 4);
 330                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 331                 *pos++ = 2;
 332                 *pos++ = 0; /* min tx power */
 333                 *pos++ = wk->chan->max_power; /* max tx power */
 334
 335                 /* 2. supported channels */
 336                 /* TODO: get this in reg domain format */
 337                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 338                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 339                 *pos++ = 2 * sband->n_channels;
 340                 for (i = 0; i < sband->n_channels; i++) {
 341                         *pos++ = ieee80211_frequency_to_channel(
 342                                         sband->channels[i].center_freq);
 343                         *pos++ = 1; /* one channel in the subband*/
 344                 }
 345         }
 346
 347         /* if present, add any custom IEs that go before HT */
 348         if (wk->ie_len && wk->ie) {
 349                 static const u8 before_ht[] = {
 350                         WLAN_EID_SSID,
 351                         WLAN_EID_SUPP_RATES,
 352                         WLAN_EID_EXT_SUPP_RATES,
 353                         WLAN_EID_PWR_CAPABILITY,
 354                         WLAN_EID_SUPPORTED_CHANNELS,
 355                         WLAN_EID_RSN,
 356                         WLAN_EID_QOS_CAPA,
 357                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 358                         WLAN_EID_MOBILITY_DOMAIN,
 359                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 360                 };
 361                 noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
 362                                              before_ht, ARRAY_SIZE(before_ht),
 363                                              offset);
 364                 pos = skb_put(skb, noffset - offset);
 365                 memcpy(pos, wk->ie + offset, noffset - offset);
 366                 offset = noffset;
 367         }
 368
 369         if (wk->assoc.use_11n && wk->assoc.wmm_used &&
 370             local->hw.queues >= 4)
 371                 ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
 372                                     sband, wk->chan, wk->assoc.smps);
 373
 374         /* if present, add any custom non-vendor IEs that go after HT */
 375         if (wk->ie_len && wk->ie) {
 376                 noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
 377                                                     offset);
 378                 pos = skb_put(skb, noffset - offset);
 379                 memcpy(pos, wk->ie + offset, noffset - offset);
 380                 offset = noffset;
 381         }
 382
 383         if (wk->assoc.wmm_used && local->hw.queues >= 4) {
 384                 if (wk->assoc.uapsd_used) {
 385                         qos_info = local->uapsd_queues;
 386                         qos_info |= (local->uapsd_max_sp_len <<
 387                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 388                 } else {
 389                         qos_info = 0;
 390                 }
 391
 392                 pos = skb_put(skb, 9);
 393                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 394                 *pos++ = 7; /* len */
 395                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 396                 *pos++ = 0x50;
 397                 *pos++ = 0xf2;
 398                 *pos++ = 2; /* WME */
 399                 *pos++ = 0; /* WME info */
 400                 *pos++ = 1; /* WME ver */
 401                 *pos++ = qos_info;
 402         }
 403
 404         /* add any remaining custom (i.e. vendor specific here) IEs */
 405         if (wk->ie_len && wk->ie) {
 406                 noffset = wk->ie_len;
 407                 pos = skb_put(skb, noffset - offset);
 408                 memcpy(pos, wk->ie + offset, noffset - offset);
 409         }
 410
 411         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 412         ieee80211_tx_skb(sdata, skb);
 413 }
 414
 415 static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
 416                                       struct ieee80211_work *wk)
 417 {
 418         struct cfg80211_bss *cbss;
 419         u16 capa_val = WLAN_CAPABILITY_ESS;
 420
 421         if (wk->probe_auth.privacy)
 422                 capa_val |= WLAN_CAPABILITY_PRIVACY;
 423
 424         cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
 425                                 wk->probe_auth.ssid, wk->probe_auth.ssid_len,
 426                                 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 427                                 capa_val);
 428         if (!cbss)
 429                 return;
 430
 431         cfg80211_unlink_bss(local->hw.wiphy, cbss);
 432         cfg80211_put_bss(cbss);
 433 }
 434
 435 static enum work_action __must_check
 436 ieee80211_direct_probe(struct ieee80211_work *wk)
 437 {
 438         struct ieee80211_sub_if_data *sdata = wk->sdata;
 439         struct ieee80211_local *local = sdata->local;
 440
 441         wk->probe_auth.tries++;
 442         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
 443                 printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
 444                        sdata->name, wk->filter_ta);
 445
 446                 /*
 447                  * Most likely AP is not in the range so remove the
 448                  * bss struct for that AP.
 449                  */
 450                 ieee80211_remove_auth_bss(local, wk);
 451
 452                 return WORK_ACT_TIMEOUT;
 453         }
 454
 455         printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
 456                sdata->name, wk->filter_ta, wk->probe_auth.tries,
 457                IEEE80211_AUTH_MAX_TRIES);
 458
 459         /*
 460          * Direct probe is sent to broadcast address as some APs
 461          * will not answer to direct packet in unassociated state.
 462          */
 463         ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
 464                                  wk->probe_auth.ssid_len, NULL, 0);
 465
 466         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 467         run_again(local, wk->timeout);
 468
 469         return WORK_ACT_NONE;
 470 }
 471
 472
 473 static enum work_action __must_check
 474 ieee80211_authenticate(struct ieee80211_work *wk)
 475 {
 476         struct ieee80211_sub_if_data *sdata = wk->sdata;
 477         struct ieee80211_local *local = sdata->local;
 478
 479         wk->probe_auth.tries++;
 480         if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
 481                 printk(KERN_DEBUG "%s: authentication with %pM"
 482                        " timed out\n", sdata->name, wk->filter_ta);
 483
 484                 /*
 485                  * Most likely AP is not in the range so remove the
 486                  * bss struct for that AP.
 487                  */
 488                 ieee80211_remove_auth_bss(local, wk);
 489
 490                 return WORK_ACT_TIMEOUT;
 491         }
 492
 493         printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
 494                sdata->name, wk->filter_ta, wk->probe_auth.tries);
 495
 496         ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
 497                             wk->ie_len, wk->filter_ta, NULL, 0, 0);
 498         wk->probe_auth.transaction = 2;
 499
 500         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 501         run_again(local, wk->timeout);
 502
 503         return WORK_ACT_NONE;
 504 }
 505
 506 static enum work_action __must_check
 507 ieee80211_associate(struct ieee80211_work *wk)
 508 {
 509         struct ieee80211_sub_if_data *sdata = wk->sdata;
 510         struct ieee80211_local *local = sdata->local;
 511
 512         wk->assoc.tries++;
 513         if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
 514                 printk(KERN_DEBUG "%s: association with %pM"
 515                        " timed out\n",
 516                        sdata->name, wk->filter_ta);
 517
 518                 /*
 519                  * Most likely AP is not in the range so remove the
 520                  * bss struct for that AP.
 521                  */
 522                 if (wk->assoc.bss)
 523                         cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
 524
 525                 return WORK_ACT_TIMEOUT;
 526         }
 527
 528         printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
 529                sdata->name, wk->filter_ta, wk->assoc.tries);
 530         ieee80211_send_assoc(sdata, wk);
 531
 532         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
 533         run_again(local, wk->timeout);
 534
 535         return WORK_ACT_NONE;
 536 }
 537
 538 static enum work_action __must_check
 539 ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
 540 {
 541         /*
 542          * First time we run, do nothing -- the generic code will
 543          * have switched to the right channel etc.
 544          */
 545         if (!wk->started) {
 546                 wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
 547
 548                 cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
 549                                           wk->chan, wk->chan_type,
 550                                           wk->remain.duration, GFP_KERNEL);
 551
 552                 return WORK_ACT_NONE;
 553         }
 554
 555         return WORK_ACT_TIMEOUT;
 556 }
 557
 558 static enum work_action __must_check
 559 ieee80211_offchannel_tx(struct ieee80211_work *wk)
 560 {
 561         if (!wk->started) {
 562                 wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
 563
 564                 /*
 565                  * After this, offchan_tx.frame remains but now is no
 566                  * longer a valid pointer -- we still need it as the
 567                  * cookie for canceling this work.
 568                  */
 569                 ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
 570
 571                 return WORK_ACT_NONE;
 572         }
 573
 574         return WORK_ACT_TIMEOUT;
 575 }
 576
 577 static enum work_action __must_check
 578 ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
 579 {
 580         if (wk->started)
 581                 return WORK_ACT_TIMEOUT;
 582
 583         /*
 584          * Wait up to one beacon interval ...
 585          * should this be more if we miss one?
 586          */
 587         printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
 588                wk->sdata->name, wk->filter_ta);
 589         wk->timeout = TU_TO_EXP_TIME(wk->assoc.bss->beacon_interval);
 590         return WORK_ACT_NONE;
 591 }
 592
 593 static void ieee80211_auth_challenge(struct ieee80211_work *wk,
 594                                      struct ieee80211_mgmt *mgmt,
 595                                      size_t len)
 596 {
 597         struct ieee80211_sub_if_data *sdata = wk->sdata;
 598         u8 *pos;
 599         struct ieee802_11_elems elems;
 600
 601         pos = mgmt->u.auth.variable;
 602         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 603         if (!elems.challenge)
 604                 return;
 605         ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
 606                             elems.challenge - 2, elems.challenge_len + 2,
 607                             wk->filter_ta, wk->probe_auth.key,
 608                             wk->probe_auth.key_len, wk->probe_auth.key_idx);
 609         wk->probe_auth.transaction = 4;
 610 }
 611
 612 static enum work_action __must_check
 613 ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
 614                        struct ieee80211_mgmt *mgmt, size_t len)
 615 {
 616         u16 auth_alg, auth_transaction, status_code;
 617
 618         if (wk->type != IEEE80211_WORK_AUTH)
 619                 return WORK_ACT_MISMATCH;
 620
 621         if (len < 24 + 6)
 622                 return WORK_ACT_NONE;
 623
 624         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 625         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 626         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 627
 628         if (auth_alg != wk->probe_auth.algorithm ||
 629             auth_transaction != wk->probe_auth.transaction)
 630                 return WORK_ACT_NONE;
 631
 632         if (status_code != WLAN_STATUS_SUCCESS) {
 633                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
 634                        wk->sdata->name, mgmt->sa, status_code);
 635                 return WORK_ACT_DONE;
 636         }
 637
 638         switch (wk->probe_auth.algorithm) {
 639         case WLAN_AUTH_OPEN:
 640         case WLAN_AUTH_LEAP:
 641         case WLAN_AUTH_FT:
 642                 break;
 643         case WLAN_AUTH_SHARED_KEY:
 644                 if (wk->probe_auth.transaction != 4) {
 645                         ieee80211_auth_challenge(wk, mgmt, len);
 646                         /* need another frame */
 647                         return WORK_ACT_NONE;
 648                 }
 649                 break;
 650         default:
 651                 WARN_ON(1);
 652                 return WORK_ACT_NONE;
 653         }
 654
 655         printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
 656         return WORK_ACT_DONE;
 657 }
 658
 659 static enum work_action __must_check
 660 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
 661                              struct ieee80211_mgmt *mgmt, size_t len,
 662                              bool reassoc)
 663 {
 664         struct ieee80211_sub_if_data *sdata = wk->sdata;
 665         struct ieee80211_local *local = sdata->local;
 666         u16 capab_info, status_code, aid;
 667         struct ieee802_11_elems elems;
 668         u8 *pos;
 669
 670         if (wk->type != IEEE80211_WORK_ASSOC)
 671                 return WORK_ACT_MISMATCH;
 672
 673         /*
 674          * AssocResp and ReassocResp have identical structure, so process both
 675          * of them in this function.
 676          */
 677
 678         if (len < 24 + 6)
 679                 return WORK_ACT_NONE;
 680
 681         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
 682         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
 683         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
 684
 685         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
 686                "status=%d aid=%d)\n",
 687                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
 688                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
 689
 690         pos = mgmt->u.assoc_resp.variable;
 691         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 692
 693         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
 694             elems.timeout_int && elems.timeout_int_len == 5 &&
 695             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
 696                 u32 tu, ms;
 697                 tu = get_unaligned_le32(elems.timeout_int + 1);
 698                 ms = tu * 1024 / 1000;
 699                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
 700                        "comeback duration %u TU (%u ms)\n",
 701                        sdata->name, mgmt->sa, tu, ms);
 702                 wk->timeout = jiffies + msecs_to_jiffies(ms);
 703                 if (ms > IEEE80211_ASSOC_TIMEOUT)
 704                         run_again(local, wk->timeout);
 705                 return WORK_ACT_NONE;
 706         }
 707
 708         if (status_code != WLAN_STATUS_SUCCESS)
 709                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
 710                        sdata->name, mgmt->sa, status_code);
 711         else
 712                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
 713
 714         return WORK_ACT_DONE;
 715 }
 716
 717 static enum work_action __must_check
 718 ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
 719                              struct ieee80211_mgmt *mgmt, size_t len,
 720                              struct ieee80211_rx_status *rx_status)
 721 {
 722         struct ieee80211_sub_if_data *sdata = wk->sdata;
 723         struct ieee80211_local *local = sdata->local;
 724         size_t baselen;
 725
 726         ASSERT_WORK_MTX(local);
 727
 728         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
 729                 return WORK_ACT_MISMATCH;
 730
 731         if (len < 24 + 12)
 732                 return WORK_ACT_NONE;
 733
 734         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 735         if (baselen > len)
 736                 return WORK_ACT_NONE;
 737
 738         printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
 739         return WORK_ACT_DONE;
 740 }
 741
 742 static enum work_action __must_check
 743 ieee80211_rx_mgmt_beacon(struct ieee80211_work *wk,
 744                          struct ieee80211_mgmt *mgmt, size_t len)
 745 {
 746         struct ieee80211_sub_if_data *sdata = wk->sdata;
 747         struct ieee80211_local *local = sdata->local;
 748
 749         ASSERT_WORK_MTX(local);
 750
 751         if (wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
 752                 return WORK_ACT_MISMATCH;
 753
 754         if (len < 24 + 12)
 755                 return WORK_ACT_NONE;
 756
 757         printk(KERN_DEBUG "%s: beacon received\n", sdata->name);
 758         return WORK_ACT_DONE;
 759 }
 760
 761 static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
 762                                           struct sk_buff *skb)
 763 {
 764         struct ieee80211_rx_status *rx_status;
 765         struct ieee80211_mgmt *mgmt;
 766         struct ieee80211_work *wk;
 767         enum work_action rma = WORK_ACT_NONE;
 768         u16 fc;
 769
 770         rx_status = (struct ieee80211_rx_status *) skb->cb;
 771         mgmt = (struct ieee80211_mgmt *) skb->data;
 772         fc = le16_to_cpu(mgmt->frame_control);
 773
 774         mutex_lock(&local->mtx);
 775
 776         list_for_each_entry(wk, &local->work_list, list) {
 777                 const u8 *bssid = NULL;
 778
 779                 switch (wk->type) {
 780                 case IEEE80211_WORK_DIRECT_PROBE:
 781                 case IEEE80211_WORK_AUTH:
 782                 case IEEE80211_WORK_ASSOC:
 783                 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
 784                         bssid = wk->filter_ta;
 785                         break;
 786                 default:
 787                         continue;
 788                 }
 789
 790                 /*
 791                  * Before queuing, we already verified mgmt->sa,
 792                  * so this is needed just for matching.
 793                  */
 794                 if (compare_ether_addr(bssid, mgmt->bssid))
 795                         continue;
 796
 797                 switch (fc & IEEE80211_FCTL_STYPE) {
 798                 case IEEE80211_STYPE_BEACON:
 799                         rma = ieee80211_rx_mgmt_beacon(wk, mgmt, skb->len);
 800                         break;
 801                 case IEEE80211_STYPE_PROBE_RESP:
 802                         rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
 803                                                            rx_status);
 804                         break;
 805                 case IEEE80211_STYPE_AUTH:
 806                         rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
 807                         break;
 808                 case IEEE80211_STYPE_ASSOC_RESP:
 809                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
 810                                                            skb->len, false);
 811                         break;
 812                 case IEEE80211_STYPE_REASSOC_RESP:
 813                         rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
 814                                                            skb->len, true);
 815                         break;
 816                 default:
 817                         WARN_ON(1);
 818                         rma = WORK_ACT_NONE;
 819                 }
 820
 821                 /*
 822                  * We've either received an unexpected frame, or we have
 823                  * multiple work items and need to match the frame to the
 824                  * right one.
 825                  */
 826                 if (rma == WORK_ACT_MISMATCH)
 827                         continue;
 828
 829                 /*
 830                  * We've processed this frame for that work, so it can't
 831                  * belong to another work struct.
 832                  * NB: this is also required for correctness for 'rma'!
 833                  */
 834                 break;
 835         }
 836
 837         switch (rma) {
 838         case WORK_ACT_MISMATCH:
 839                 /* ignore this unmatched frame */
 840                 break;
 841         case WORK_ACT_NONE:
 842                 break;
 843         case WORK_ACT_DONE:
 844                 list_del_rcu(&wk->list);
 845                 break;
 846         default:
 847                 WARN(1, "unexpected: %d", rma);
 848         }
 849
 850         mutex_unlock(&local->mtx);
 851
 852         if (rma != WORK_ACT_DONE)
 853                 goto out;
 854
 855         switch (wk->done(wk, skb)) {
 856         case WORK_DONE_DESTROY:
 857                 free_work(wk);
 858                 break;
 859         case WORK_DONE_REQUEUE:
 860                 synchronize_rcu();
 861                 wk->started = false; /* restart */
 862                 mutex_lock(&local->mtx);
 863                 list_add_tail(&wk->list, &local->work_list);
 864                 mutex_unlock(&local->mtx);
 865         }
 866
 867  out:
 868         kfree_skb(skb);
 869 }
 870
 871 static bool ieee80211_work_ct_coexists(enum nl80211_channel_type wk_ct,
 872                                        enum nl80211_channel_type oper_ct)
 873 {
 874         switch (wk_ct) {
 875         case NL80211_CHAN_NO_HT:
 876                 return true;
 877         case NL80211_CHAN_HT20:
 878                 if (oper_ct != NL80211_CHAN_NO_HT)
 879                         return true;
 880                 return false;
 881         case NL80211_CHAN_HT40MINUS:
 882         case NL80211_CHAN_HT40PLUS:
 883                 return (wk_ct == oper_ct);
 884         }
 885         WARN_ON(1); /* shouldn't get here */
 886         return false;
 887 }
 888
 889 static enum nl80211_channel_type
 890 ieee80211_calc_ct(enum nl80211_channel_type wk_ct,
 891                   enum nl80211_channel_type oper_ct)
 892 {
 893         switch (wk_ct) {
 894         case NL80211_CHAN_NO_HT:
 895                 return oper_ct;
 896         case NL80211_CHAN_HT20:
 897                 if (oper_ct != NL80211_CHAN_NO_HT)
 898                         return oper_ct;
 899                 return wk_ct;
 900         case NL80211_CHAN_HT40MINUS:
 901         case NL80211_CHAN_HT40PLUS:
 902                 return wk_ct;
 903         }
 904         WARN_ON(1); /* shouldn't get here */
 905         return wk_ct;
 906 }
 907
 908
 909 static void ieee80211_work_timer(unsigned long data)
 910 {
 911         struct ieee80211_local *local = (void *) data;
 912
 913         if (local->quiescing)
 914                 return;
 915
 916         ieee80211_queue_work(&local->hw, &local->work_work);
 917 }
 918
 919 static void ieee80211_work_work(struct work_struct *work)
 920 {
 921         struct ieee80211_local *local =
 922                 container_of(work, struct ieee80211_local, work_work);
 923         struct sk_buff *skb;
 924         struct ieee80211_work *wk, *tmp;
 925         LIST_HEAD(free_work);
 926         enum work_action rma;
 927         bool remain_off_channel = false;
 928
 929         if (local->scanning)
 930                 return;
 931
 932         /*
 933          * ieee80211_queue_work() should have picked up most cases,
 934          * here we'll pick the rest.
 935          */
 936         if (WARN(local->suspended, "work scheduled while going to suspend\n"))
 937                 return;
 938
 939         /* first process frames to avoid timing out while a frame is pending */
 940         while ((skb = skb_dequeue(&local->work_skb_queue)))
 941                 ieee80211_work_rx_queued_mgmt(local, skb);
 942
 943         mutex_lock(&local->mtx);
 944
 945         ieee80211_recalc_idle(local);
 946
 947         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
 948                 bool started = wk->started;
 949
 950                 /* mark work as started if it's on the current off-channel */
 951                 if (!started && local->tmp_channel &&
 952                     wk->chan == local->tmp_channel &&
 953                     wk->chan_type == local->tmp_channel_type) {
 954                         started = true;
 955                         wk->timeout = jiffies;
 956                 }
 957
 958                 if (!started && !local->tmp_channel) {
 959                         bool on_oper_chan;
 960                         bool tmp_chan_changed = false;
 961                         bool on_oper_chan2;
 962                         enum nl80211_channel_type wk_ct;
 963                         on_oper_chan = ieee80211_cfg_on_oper_channel(local);
 964
 965                         /* Work with existing channel type if possible. */
 966                         wk_ct = wk->chan_type;
 967                         if (wk->chan == local->hw.conf.channel)
 968                                 wk_ct = ieee80211_calc_ct(wk->chan_type,
 969                                                 local->hw.conf.channel_type);
 970
 971                         if (local->tmp_channel)
 972                                 if ((local->tmp_channel != wk->chan) ||
 973                                     (local->tmp_channel_type != wk_ct))
 974                                         tmp_chan_changed = true;
 975
 976                         local->tmp_channel = wk->chan;
 977                         local->tmp_channel_type = wk_ct;
 978                         /*
 979                          * Leave the station vifs in awake mode if they
 980                          * happen to be on the same channel as
 981                          * the requested channel.
 982                          */
 983                         on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
 984                         if (on_oper_chan != on_oper_chan2) {
 985                                 if (on_oper_chan2) {
 986                                         /* going off oper channel, PS too */
 987                                         ieee80211_offchannel_stop_vifs(local,
 988                                                                        true);
 989                                         ieee80211_hw_config(local, 0);
 990                                 } else {
 991                                         /* going on channel, but leave PS
 992                                          * off-channel. */
 993                                         ieee80211_hw_config(local, 0);
 994                                         ieee80211_offchannel_return(local,
 995                                                                     true,
 996                                                                     false);
 997                                 }
 998                         } else if (tmp_chan_changed)
 999                                 /* Still off-channel, but on some other
1000                                  * channel, so update hardware.
1001                                  * PS should already be off-channel.
1002                                  */
1003                                 ieee80211_hw_config(local, 0);
1004
1005                         started = true;
1006                         wk->timeout = jiffies;
1007                 }
1008
1009                 /* don't try to work with items that aren't started */
1010                 if (!started)
1011                         continue;
1012
1013                 if (time_is_after_jiffies(wk->timeout)) {
1014                         /*
1015                          * This work item isn't supposed to be worked on
1016                          * right now, but take care to adjust the timer
1017                          * properly.
1018                          */
1019                         run_again(local, wk->timeout);
1020                         continue;
1021                 }
1022
1023                 switch (wk->type) {
1024                 default:
1025                         WARN_ON(1);
1026                         /* nothing */
1027                         rma = WORK_ACT_NONE;
1028                         break;
1029                 case IEEE80211_WORK_ABORT:
1030                         rma = WORK_ACT_TIMEOUT;
1031                         break;
1032                 case IEEE80211_WORK_DIRECT_PROBE:
1033                         rma = ieee80211_direct_probe(wk);
1034                         break;
1035                 case IEEE80211_WORK_AUTH:
1036                         rma = ieee80211_authenticate(wk);
1037                         break;
1038                 case IEEE80211_WORK_ASSOC:
1039                         rma = ieee80211_associate(wk);
1040                         break;
1041                 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
1042                         rma = ieee80211_remain_on_channel_timeout(wk);
1043                         break;
1044                 case IEEE80211_WORK_OFFCHANNEL_TX:
1045                         rma = ieee80211_offchannel_tx(wk);
1046                         break;
1047                 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
1048                         rma = ieee80211_assoc_beacon_wait(wk);
1049                         break;
1050                 }
1051
1052                 wk->started = started;
1053
1054                 switch (rma) {
1055                 case WORK_ACT_NONE:
1056                         /* might have changed the timeout */
1057                         run_again(local, wk->timeout);
1058                         break;
1059                 case WORK_ACT_TIMEOUT:
1060                         list_del_rcu(&wk->list);
1061                         synchronize_rcu();
1062                         list_add(&wk->list, &free_work);
1063                         break;
1064                 default:
1065                         WARN(1, "unexpected: %d", rma);
1066                 }
1067         }
1068
1069         list_for_each_entry(wk, &local->work_list, list) {
1070                 if (!wk->started)
1071                         continue;
1072                 if (wk->chan != local->tmp_channel)
1073                         continue;
1074                 if (ieee80211_work_ct_coexists(wk->chan_type,
1075                                                local->tmp_channel_type))
1076                         continue;
1077                 remain_off_channel = true;
1078         }
1079
1080         if (!remain_off_channel && local->tmp_channel) {
1081                 bool on_oper_chan = ieee80211_cfg_on_oper_channel(local);
1082                 local->tmp_channel = NULL;
1083                 /* If tmp_channel wasn't operating channel, then
1084                  * we need to go back on-channel.
1085                  * NOTE:  If we can ever be here while scannning,
1086                  * or if the hw_config() channel config logic changes,
1087                  * then we may need to do a more thorough check to see if
1088                  * we still need to do a hardware config.  Currently,
1089                  * we cannot be here while scanning, however.
1090                  */
1091                 if (ieee80211_cfg_on_oper_channel(local) && !on_oper_chan)
1092                         ieee80211_hw_config(local, 0);
1093
1094                 /* At the least, we need to disable offchannel_ps,
1095                  * so just go ahead and run the entire offchannel
1096                  * return logic here.  We *could* skip enabling
1097                  * beaconing if we were already on-oper-channel
1098                  * as a future optimization.
1099                  */
1100                 ieee80211_offchannel_return(local, true, true);
1101
1102                 /* give connection some time to breathe */
1103                 run_again(local, jiffies + HZ/2);
1104         }
1105
1106         if (list_empty(&local->work_list) && local->scan_req &&
1107             !local->scanning)
1108                 ieee80211_queue_delayed_work(&local->hw,
1109                                              &local->scan_work,
1110                                              round_jiffies_relative(0));
1111
1112         ieee80211_recalc_idle(local);
1113
1114         mutex_unlock(&local->mtx);
1115
1116         list_for_each_entry_safe(wk, tmp, &free_work, list) {
1117                 wk->done(wk, NULL);
1118                 list_del(&wk->list);
1119                 kfree(wk);
1120         }
1121 }
1122
1123 void ieee80211_add_work(struct ieee80211_work *wk)
1124 {
1125         struct ieee80211_local *local;
1126
1127         if (WARN_ON(!wk->chan))
1128                 return;
1129
1130         if (WARN_ON(!wk->sdata))
1131                 return;
1132
1133         if (WARN_ON(!wk->done))
1134                 return;
1135
1136         if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
1137                 return;
1138
1139         wk->started = false;
1140
1141         local = wk->sdata->local;
1142         mutex_lock(&local->mtx);
1143         list_add_tail(&wk->list, &local->work_list);
1144         mutex_unlock(&local->mtx);
1145
1146         ieee80211_queue_work(&local->hw, &local->work_work);
1147 }
1148
1149 void ieee80211_work_init(struct ieee80211_local *local)
1150 {
1151         INIT_LIST_HEAD(&local->work_list);
1152         setup_timer(&local->work_timer, ieee80211_work_timer,
1153                     (unsigned long)local);
1154         INIT_WORK(&local->work_work, ieee80211_work_work);
1155         skb_queue_head_init(&local->work_skb_queue);
1156 }
1157
1158 void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
1159 {
1160         struct ieee80211_local *local = sdata->local;
1161         struct ieee80211_work *wk;
1162         bool cleanup = false;
1163
1164         mutex_lock(&local->mtx);
1165         list_for_each_entry(wk, &local->work_list, list) {
1166                 if (wk->sdata != sdata)
1167                         continue;
1168                 cleanup = true;
1169                 wk->type = IEEE80211_WORK_ABORT;
1170                 wk->started = true;
1171                 wk->timeout = jiffies;
1172         }
1173         mutex_unlock(&local->mtx);
1174
1175         /* run cleanups etc. */
1176         if (cleanup)
1177                 ieee80211_work_work(&local->work_work);
1178
1179         mutex_lock(&local->mtx);
1180         list_for_each_entry(wk, &local->work_list, list) {
1181                 if (wk->sdata != sdata)
1182                         continue;
1183                 WARN_ON(1);
1184                 break;
1185         }
1186         mutex_unlock(&local->mtx);
1187 }
1188
1189 ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1190                                            struct sk_buff *skb)
1191 {
1192         struct ieee80211_local *local = sdata->local;
1193         struct ieee80211_mgmt *mgmt;
1194         struct ieee80211_work *wk;
1195         u16 fc;
1196
1197         if (skb->len < 24)
1198                 return RX_DROP_MONITOR;
1199
1200         mgmt = (struct ieee80211_mgmt *) skb->data;
1201         fc = le16_to_cpu(mgmt->frame_control);
1202
1203         list_for_each_entry_rcu(wk, &local->work_list, list) {
1204                 if (sdata != wk->sdata)
1205                         continue;
1206                 if (compare_ether_addr(wk->filter_ta, mgmt->sa))
1207                         continue;
1208                 if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
1209                         continue;
1210
1211                 switch (fc & IEEE80211_FCTL_STYPE) {
1212                 case IEEE80211_STYPE_AUTH:
1213                 case IEEE80211_STYPE_PROBE_RESP:
1214                 case IEEE80211_STYPE_ASSOC_RESP:
1215                 case IEEE80211_STYPE_REASSOC_RESP:
1216                 case IEEE80211_STYPE_BEACON:
1217                         skb_queue_tail(&local->work_skb_queue, skb);
1218                         ieee80211_queue_work(&local->hw, &local->work_work);
1219                         return RX_QUEUED;
1220                 }
1221         }
1222
1223         return RX_CONTINUE;
1224 }
1225
1226 static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
1227                                                    struct sk_buff *skb)
1228 {
1229         /*
1230          * We are done serving the remain-on-channel command.
1231          */
1232         cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1233                                            wk->chan, wk->chan_type,
1234                                            GFP_KERNEL);
1235
1236         return WORK_DONE_DESTROY;
1237 }
1238
1239 int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1240                                    struct ieee80211_channel *chan,
1241                                    enum nl80211_channel_type channel_type,
1242                                    unsigned int duration, u64 *cookie)
1243 {
1244         struct ieee80211_work *wk;
1245
1246         wk = kzalloc(sizeof(*wk), GFP_KERNEL);
1247         if (!wk)
1248                 return -ENOMEM;
1249
1250         wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
1251         wk->chan = chan;
1252         wk->chan_type = channel_type;
1253         wk->sdata = sdata;
1254         wk->done = ieee80211_remain_done;
1255
1256         wk->remain.duration = duration;
1257
1258         *cookie = (unsigned long) wk;
1259
1260         ieee80211_add_work(wk);
1261
1262         return 0;
1263 }
1264
1265 int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
1266                                           u64 cookie)
1267 {
1268         struct ieee80211_local *local = sdata->local;
1269         struct ieee80211_work *wk, *tmp;
1270         bool found = false;
1271
1272         mutex_lock(&local->mtx);
1273         list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1274                 if ((unsigned long) wk == cookie) {
1275                         wk->timeout = jiffies;
1276                         found = true;
1277                         break;
1278                 }
1279         }
1280         mutex_unlock(&local->mtx);
1281
1282         if (!found)
1283                 return -ENOENT;
1284
1285         ieee80211_queue_work(&local->hw, &local->work_work);
1286
1287         return 0;
1288 }