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