net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_WAIT (HZ / 5)
  37 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  39
  40 #define TMR_RUNNING_TIMER       0
  41 #define TMR_RUNNING_CHANSW      1
  42
  43 /* utils */
  44 static int ecw2cw(int ecw)
  45 {
  46         return (1 << ecw) - 1;
  47 }
  48
  49 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  50 {
  51         u8 *end, *pos;
  52
  53         pos = bss->cbss.information_elements;
  54         if (pos == NULL)
  55                 return NULL;
  56         end = pos + bss->cbss.len_information_elements;
  57
  58         while (pos + 1 < end) {
  59                 if (pos + 2 + pos[1] > end)
  60                         break;
  61                 if (pos[0] == ie)
  62                         return pos;
  63                 pos += 2 + pos[1];
  64         }
  65
  66         return NULL;
  67 }
  68
  69 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  70                                       struct ieee80211_supported_band *sband,
  71                                       u32 *rates)
  72 {
  73         int i, j, count;
  74         *rates = 0;
  75         count = 0;
  76         for (i = 0; i < bss->supp_rates_len; i++) {
  77                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  78
  79                 for (j = 0; j < sband->n_bitrates; j++)
  80                         if (sband->bitrates[j].bitrate == rate) {
  81                                 *rates |= BIT(j);
  82                                 count++;
  83                                 break;
  84                         }
  85         }
  86
  87         return count;
  88 }
  89
  90 /*
  91  * ieee80211_enable_ht should be called only after the operating band
  92  * has been determined as ht configuration depends on the hw's
  93  * HT abilities for a specific band.
  94  */
  95 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  96                                struct ieee80211_ht_info *hti,
  97                                u16 ap_ht_cap_flags)
  98 {
  99         struct ieee80211_local *local = sdata->local;
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 102         struct sta_info *sta;
 103         u32 changed = 0;
 104         u16 ht_opmode;
 105         bool enable_ht = true, ht_changed;
 106         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 107
 108         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 109
 110         /* HT is not supported */
 111         if (!sband->ht_cap.ht_supported)
 112                 enable_ht = false;
 113
 114         /* check that channel matches the right operating channel */
 115         if (local->hw.conf.channel->center_freq !=
 116             ieee80211_channel_to_frequency(hti->control_chan))
 117                 enable_ht = false;
 118
 119         if (enable_ht) {
 120                 channel_type = NL80211_CHAN_HT20;
 121
 122                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 123                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 124                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 125                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 126                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 127                                 if (!(local->hw.conf.channel->flags &
 128                                     IEEE80211_CHAN_NO_HT40PLUS))
 129                                         channel_type = NL80211_CHAN_HT40PLUS;
 130                                 break;
 131                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 132                                 if (!(local->hw.conf.channel->flags &
 133                                     IEEE80211_CHAN_NO_HT40MINUS))
 134                                         channel_type = NL80211_CHAN_HT40MINUS;
 135                                 break;
 136                         }
 137                 }
 138         }
 139
 140         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 141                      channel_type != local->hw.conf.channel_type;
 142
 143         local->oper_channel_type = channel_type;
 144
 145         if (ht_changed) {
 146                 /* channel_type change automatically detected */
 147                 ieee80211_hw_config(local, 0);
 148
 149                 rcu_read_lock();
 150
 151                 sta = sta_info_get(local, ifmgd->bssid);
 152                 if (sta)
 153                         rate_control_rate_update(local, sband, sta,
 154                                                  IEEE80211_RC_HT_CHANGED);
 155
 156                 rcu_read_unlock();
 157         }
 158
 159         /* disable HT */
 160         if (!enable_ht)
 161                 return 0;
 162
 163         ht_opmode = le16_to_cpu(hti->operation_mode);
 164
 165         /* if bss configuration changed store the new one */
 166         if (!sdata->ht_opmode_valid ||
 167             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 168                 changed |= BSS_CHANGED_HT;
 169                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 170                 sdata->ht_opmode_valid = true;
 171         }
 172
 173         return changed;
 174 }
 175
 176 /* frame sending functions */
 177
 178 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 179 {
 180         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 181         struct ieee80211_local *local = sdata->local;
 182         struct sk_buff *skb;
 183         struct ieee80211_mgmt *mgmt;
 184         u8 *pos, *ies, *ht_ie;
 185         int i, len, count, rates_len, supp_rates_len;
 186         u16 capab;
 187         struct ieee80211_bss *bss;
 188         int wmm = 0;
 189         struct ieee80211_supported_band *sband;
 190         u32 rates = 0;
 191
 192         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 193                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 194                             ifmgd->ssid_len);
 195         if (!skb) {
 196                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 197                        "frame\n", sdata->dev->name);
 198                 return;
 199         }
 200         skb_reserve(skb, local->hw.extra_tx_headroom);
 201
 202         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 203
 204         capab = ifmgd->capab;
 205
 206         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 207                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 208                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 209                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 210                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 211         }
 212
 213         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 214                                    local->hw.conf.channel->center_freq,
 215                                    ifmgd->ssid, ifmgd->ssid_len);
 216         if (bss) {
 217                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 218                         capab |= WLAN_CAPABILITY_PRIVACY;
 219                 if (bss->wmm_used)
 220                         wmm = 1;
 221
 222                 /* get all rates supported by the device and the AP as
 223                  * some APs don't like getting a superset of their rates
 224                  * in the association request (e.g. D-Link DAP 1353 in
 225                  * b-only mode) */
 226                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 227
 228                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 229                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 230                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 231
 232                 ieee80211_rx_bss_put(local, bss);
 233         } else {
 234                 rates = ~0;
 235                 rates_len = sband->n_bitrates;
 236         }
 237
 238         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 239         memset(mgmt, 0, 24);
 240         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 241         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 242         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 243
 244         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 245                 skb_put(skb, 10);
 246                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 247                                                   IEEE80211_STYPE_REASSOC_REQ);
 248                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 249                 mgmt->u.reassoc_req.listen_interval =
 250                                 cpu_to_le16(local->hw.conf.listen_interval);
 251                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 252                        ETH_ALEN);
 253         } else {
 254                 skb_put(skb, 4);
 255                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 256                                                   IEEE80211_STYPE_ASSOC_REQ);
 257                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 258                 mgmt->u.assoc_req.listen_interval =
 259                                 cpu_to_le16(local->hw.conf.listen_interval);
 260         }
 261
 262         /* SSID */
 263         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 264         *pos++ = WLAN_EID_SSID;
 265         *pos++ = ifmgd->ssid_len;
 266         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 267
 268         /* add all rates which were marked to be used above */
 269         supp_rates_len = rates_len;
 270         if (supp_rates_len > 8)
 271                 supp_rates_len = 8;
 272
 273         len = sband->n_bitrates;
 274         pos = skb_put(skb, supp_rates_len + 2);
 275         *pos++ = WLAN_EID_SUPP_RATES;
 276         *pos++ = supp_rates_len;
 277
 278         count = 0;
 279         for (i = 0; i < sband->n_bitrates; i++) {
 280                 if (BIT(i) & rates) {
 281                         int rate = sband->bitrates[i].bitrate;
 282                         *pos++ = (u8) (rate / 5);
 283                         if (++count == 8)
 284                                 break;
 285                 }
 286         }
 287
 288         if (rates_len > count) {
 289                 pos = skb_put(skb, rates_len - count + 2);
 290                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 291                 *pos++ = rates_len - count;
 292
 293                 for (i++; i < sband->n_bitrates; i++) {
 294                         if (BIT(i) & rates) {
 295                                 int rate = sband->bitrates[i].bitrate;
 296                                 *pos++ = (u8) (rate / 5);
 297                         }
 298                 }
 299         }
 300
 301         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 302                 /* 1. power capabilities */
 303                 pos = skb_put(skb, 4);
 304                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 305                 *pos++ = 2;
 306                 *pos++ = 0; /* min tx power */
 307                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 308
 309                 /* 2. supported channels */
 310                 /* TODO: get this in reg domain format */
 311                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 312                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 313                 *pos++ = 2 * sband->n_channels;
 314                 for (i = 0; i < sband->n_channels; i++) {
 315                         *pos++ = ieee80211_frequency_to_channel(
 316                                         sband->channels[i].center_freq);
 317                         *pos++ = 1; /* one channel in the subband*/
 318                 }
 319         }
 320
 321         if (ifmgd->extra_ie) {
 322                 pos = skb_put(skb, ifmgd->extra_ie_len);
 323                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 324         }
 325
 326         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 327                 pos = skb_put(skb, 9);
 328                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 329                 *pos++ = 7; /* len */
 330                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 331                 *pos++ = 0x50;
 332                 *pos++ = 0xf2;
 333                 *pos++ = 2; /* WME */
 334                 *pos++ = 0; /* WME info */
 335                 *pos++ = 1; /* WME ver */
 336                 *pos++ = 0;
 337         }
 338
 339         /* wmm support is a must to HT */
 340         /*
 341          * IEEE802.11n does not allow TKIP/WEP as pairwise
 342          * ciphers in HT mode. We still associate in non-ht
 343          * mode (11a/b/g) if any one of these ciphers is
 344          * configured as pairwise.
 345          */
 346         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 347             sband->ht_cap.ht_supported &&
 348             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 349             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 350             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 351                 struct ieee80211_ht_info *ht_info =
 352                         (struct ieee80211_ht_info *)(ht_ie + 2);
 353                 u16 cap = sband->ht_cap.cap;
 354                 __le16 tmp;
 355                 u32 flags = local->hw.conf.channel->flags;
 356
 357                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 358                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 359                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 360                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 361                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 362                         }
 363                         break;
 364                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 365                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 366                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 367                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 368                         }
 369                         break;
 370                 }
 371
 372                 tmp = cpu_to_le16(cap);
 373                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 374                 *pos++ = WLAN_EID_HT_CAPABILITY;
 375                 *pos++ = sizeof(struct ieee80211_ht_cap);
 376                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 377                 memcpy(pos, &tmp, sizeof(u16));
 378                 pos += sizeof(u16);
 379                 /* TODO: needs a define here for << 2 */
 380                 *pos++ = sband->ht_cap.ampdu_factor |
 381                          (sband->ht_cap.ampdu_density << 2);
 382                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 383         }
 384
 385         kfree(ifmgd->assocreq_ies);
 386         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 387         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 388         if (ifmgd->assocreq_ies)
 389                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 390
 391         ieee80211_tx_skb(sdata, skb, 0);
 392 }
 393
 394
 395 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 396                                            u16 stype, u16 reason)
 397 {
 398         struct ieee80211_local *local = sdata->local;
 399         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 400         struct sk_buff *skb;
 401         struct ieee80211_mgmt *mgmt;
 402
 403         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 404         if (!skb) {
 405                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 406                        "deauth/disassoc frame\n", sdata->dev->name);
 407                 return;
 408         }
 409         skb_reserve(skb, local->hw.extra_tx_headroom);
 410
 411         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 412         memset(mgmt, 0, 24);
 413         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 414         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 415         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 416         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 417         skb_put(skb, 2);
 418         /* u.deauth.reason_code == u.disassoc.reason_code */
 419         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 420
 421         if (stype == IEEE80211_STYPE_DEAUTH)
 422                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len,
 423                                      GFP_KERNEL);
 424         else
 425                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len,
 426                                        GFP_KERNEL);
 427         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 428 }
 429
 430 void ieee80211_send_pspoll(struct ieee80211_local *local,
 431                            struct ieee80211_sub_if_data *sdata)
 432 {
 433         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 434         struct ieee80211_pspoll *pspoll;
 435         struct sk_buff *skb;
 436         u16 fc;
 437
 438         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 439         if (!skb) {
 440                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 441                        "pspoll frame\n", sdata->dev->name);
 442                 return;
 443         }
 444         skb_reserve(skb, local->hw.extra_tx_headroom);
 445
 446         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 447         memset(pspoll, 0, sizeof(*pspoll));
 448         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 449         pspoll->frame_control = cpu_to_le16(fc);
 450         pspoll->aid = cpu_to_le16(ifmgd->aid);
 451
 452         /* aid in PS-Poll has its two MSBs each set to 1 */
 453         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 454
 455         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 456         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 457
 458         ieee80211_tx_skb(sdata, skb, 0);
 459 }
 460
 461 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 462                              struct ieee80211_sub_if_data *sdata,
 463                              int powersave)
 464 {
 465         struct sk_buff *skb;
 466         struct ieee80211_hdr *nullfunc;
 467         __le16 fc;
 468
 469         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 470                 return;
 471
 472         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 473         if (!skb) {
 474                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 475                        "frame\n", sdata->dev->name);
 476                 return;
 477         }
 478         skb_reserve(skb, local->hw.extra_tx_headroom);
 479
 480         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 481         memset(nullfunc, 0, 24);
 482         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 483                          IEEE80211_FCTL_TODS);
 484         if (powersave)
 485                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 486         nullfunc->frame_control = fc;
 487         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 488         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 489         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 490
 491         ieee80211_tx_skb(sdata, skb, 0);
 492 }
 493
 494 /* spectrum management related things */
 495 static void ieee80211_chswitch_work(struct work_struct *work)
 496 {
 497         struct ieee80211_sub_if_data *sdata =
 498                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 499         struct ieee80211_bss *bss;
 500         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 501
 502         if (!netif_running(sdata->dev))
 503                 return;
 504
 505         bss = ieee80211_rx_bss_get(sdata->local, ifmgd->bssid,
 506                                    sdata->local->hw.conf.channel->center_freq,
 507                                    ifmgd->ssid, ifmgd->ssid_len);
 508         if (!bss)
 509                 goto exit;
 510
 511         sdata->local->oper_channel = sdata->local->csa_channel;
 512         /* XXX: shouldn't really modify cfg80211-owned data! */
 513         if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL))
 514                 bss->cbss.channel = sdata->local->oper_channel;
 515
 516         ieee80211_rx_bss_put(sdata->local, bss);
 517 exit:
 518         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 519         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 520                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 521 }
 522
 523 static void ieee80211_chswitch_timer(unsigned long data)
 524 {
 525         struct ieee80211_sub_if_data *sdata =
 526                 (struct ieee80211_sub_if_data *) data;
 527         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 528
 529         if (sdata->local->quiescing) {
 530                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 531                 return;
 532         }
 533
 534         queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 535 }
 536
 537 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 538                                       struct ieee80211_channel_sw_ie *sw_elem,
 539                                       struct ieee80211_bss *bss)
 540 {
 541         struct ieee80211_channel *new_ch;
 542         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 543         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 544
 545         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATED)
 546                 return;
 547
 548         if (sdata->local->sw_scanning || sdata->local->hw_scanning)
 549                 return;
 550
 551         /* Disregard subsequent beacons if we are already running a timer
 552            processing a CSA */
 553
 554         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 555                 return;
 556
 557         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 558         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 559                 return;
 560
 561         sdata->local->csa_channel = new_ch;
 562
 563         if (sw_elem->count <= 1) {
 564                 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 565         } else {
 566                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 567                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 568                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 569                 mod_timer(&ifmgd->chswitch_timer,
 570                           jiffies +
 571                           msecs_to_jiffies(sw_elem->count *
 572                                            bss->cbss.beacon_interval));
 573         }
 574 }
 575
 576 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 577                                         u16 capab_info, u8 *pwr_constr_elem,
 578                                         u8 pwr_constr_elem_len)
 579 {
 580         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 581
 582         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 583                 return;
 584
 585         /* Power constraint IE length should be 1 octet */
 586         if (pwr_constr_elem_len != 1)
 587                 return;
 588
 589         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 590             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 591                 sdata->local->power_constr_level = *pwr_constr_elem;
 592                 ieee80211_hw_config(sdata->local, 0);
 593         }
 594 }
 595
 596 /* powersave */
 597 static void ieee80211_enable_ps(struct ieee80211_local *local,
 598                                 struct ieee80211_sub_if_data *sdata)
 599 {
 600         struct ieee80211_conf *conf = &local->hw.conf;
 601
 602         /*
 603          * If we are scanning right now then the parameters will
 604          * take effect when scan finishes.
 605          */
 606         if (local->hw_scanning || local->sw_scanning)
 607                 return;
 608
 609         if (conf->dynamic_ps_timeout > 0 &&
 610             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 611                 mod_timer(&local->dynamic_ps_timer, jiffies +
 612                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 613         } else {
 614                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 615                         ieee80211_send_nullfunc(local, sdata, 1);
 616                 conf->flags |= IEEE80211_CONF_PS;
 617                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 618         }
 619 }
 620
 621 static void ieee80211_change_ps(struct ieee80211_local *local)
 622 {
 623         struct ieee80211_conf *conf = &local->hw.conf;
 624
 625         if (local->ps_sdata) {
 626                 ieee80211_enable_ps(local, local->ps_sdata);
 627         } else if (conf->flags & IEEE80211_CONF_PS) {
 628                 conf->flags &= ~IEEE80211_CONF_PS;
 629                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 630                 del_timer_sync(&local->dynamic_ps_timer);
 631                 cancel_work_sync(&local->dynamic_ps_enable_work);
 632         }
 633 }
 634
 635 /* need to hold RTNL or interface lock */
 636 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 637 {
 638         struct ieee80211_sub_if_data *sdata, *found = NULL;
 639         int count = 0;
 640
 641         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 642                 local->ps_sdata = NULL;
 643                 return;
 644         }
 645
 646         list_for_each_entry(sdata, &local->interfaces, list) {
 647                 if (!netif_running(sdata->dev))
 648                         continue;
 649                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 650                         continue;
 651                 found = sdata;
 652                 count++;
 653         }
 654
 655         if (count == 1 && found->u.mgd.powersave &&
 656             (found->u.mgd.flags & IEEE80211_STA_ASSOCIATED) &&
 657             !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) {
 658                 s32 beaconint_us;
 659
 660                 if (latency < 0)
 661                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 662
 663                 beaconint_us = ieee80211_tu_to_usec(
 664                                         found->vif.bss_conf.beacon_int);
 665
 666                 if (beaconint_us > latency) {
 667                         local->ps_sdata = NULL;
 668                 } else {
 669                         u8 dtimper = found->vif.bss_conf.dtim_period;
 670                         int maxslp = 1;
 671
 672                         if (dtimper > 1)
 673                                 maxslp = min_t(int, dtimper,
 674                                                     latency / beaconint_us);
 675
 676                         local->hw.conf.max_sleep_period = maxslp;
 677                         local->ps_sdata = found;
 678                 }
 679         } else {
 680                 local->ps_sdata = NULL;
 681         }
 682
 683         ieee80211_change_ps(local);
 684 }
 685
 686 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 687 {
 688         struct ieee80211_local *local =
 689                 container_of(work, struct ieee80211_local,
 690                              dynamic_ps_disable_work);
 691
 692         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 693                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 694                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 695         }
 696
 697         ieee80211_wake_queues_by_reason(&local->hw,
 698                                         IEEE80211_QUEUE_STOP_REASON_PS);
 699 }
 700
 701 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 702 {
 703         struct ieee80211_local *local =
 704                 container_of(work, struct ieee80211_local,
 705                              dynamic_ps_enable_work);
 706         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 707
 708         /* can only happen when PS was just disabled anyway */
 709         if (!sdata)
 710                 return;
 711
 712         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 713                 return;
 714
 715         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 716                 ieee80211_send_nullfunc(local, sdata, 1);
 717
 718         local->hw.conf.flags |= IEEE80211_CONF_PS;
 719         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 720 }
 721
 722 void ieee80211_dynamic_ps_timer(unsigned long data)
 723 {
 724         struct ieee80211_local *local = (void *) data;
 725
 726         if (local->quiescing)
 727                 return;
 728
 729         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 730 }
 731
 732 /* MLME */
 733 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 734                                      struct ieee80211_if_managed *ifmgd,
 735                                      u8 *wmm_param, size_t wmm_param_len)
 736 {
 737         struct ieee80211_tx_queue_params params;
 738         size_t left;
 739         int count;
 740         u8 *pos;
 741
 742         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 743                 return;
 744
 745         if (!wmm_param)
 746                 return;
 747
 748         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 749                 return;
 750         count = wmm_param[6] & 0x0f;
 751         if (count == ifmgd->wmm_last_param_set)
 752                 return;
 753         ifmgd->wmm_last_param_set = count;
 754
 755         pos = wmm_param + 8;
 756         left = wmm_param_len - 8;
 757
 758         memset(&params, 0, sizeof(params));
 759
 760         local->wmm_acm = 0;
 761         for (; left >= 4; left -= 4, pos += 4) {
 762                 int aci = (pos[0] >> 5) & 0x03;
 763                 int acm = (pos[0] >> 4) & 0x01;
 764                 int queue;
 765
 766                 switch (aci) {
 767                 case 1: /* AC_BK */
 768                         queue = 3;
 769                         if (acm)
 770                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 771                         break;
 772                 case 2: /* AC_VI */
 773                         queue = 1;
 774                         if (acm)
 775                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 776                         break;
 777                 case 3: /* AC_VO */
 778                         queue = 0;
 779                         if (acm)
 780                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 781                         break;
 782                 case 0: /* AC_BE */
 783                 default:
 784                         queue = 2;
 785                         if (acm)
 786                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 787                         break;
 788                 }
 789
 790                 params.aifs = pos[0] & 0x0f;
 791                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 792                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 793                 params.txop = get_unaligned_le16(pos + 2);
 794 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 795                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 796                        "cWmin=%d cWmax=%d txop=%d\n",
 797                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 798                        params.aifs, params.cw_min, params.cw_max, params.txop);
 799 #endif
 800                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 801                         printk(KERN_DEBUG "%s: failed to set TX queue "
 802                                "parameters for queue %d\n",
 803                                wiphy_name(local->hw.wiphy), queue);
 804         }
 805 }
 806
 807 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 808                                            u16 capab, bool erp_valid, u8 erp)
 809 {
 810         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 811 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 812         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 813 #endif
 814         u32 changed = 0;
 815         bool use_protection;
 816         bool use_short_preamble;
 817         bool use_short_slot;
 818
 819         if (erp_valid) {
 820                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 821                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 822         } else {
 823                 use_protection = false;
 824                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 825         }
 826
 827         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 828
 829         if (use_protection != bss_conf->use_cts_prot) {
 830 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 831                 if (net_ratelimit()) {
 832                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 833                                sdata->dev->name,
 834                                use_protection ? "enabled" : "disabled",
 835                                ifmgd->bssid);
 836                 }
 837 #endif
 838                 bss_conf->use_cts_prot = use_protection;
 839                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 840         }
 841
 842         if (use_short_preamble != bss_conf->use_short_preamble) {
 843 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 844                 if (net_ratelimit()) {
 845                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 846                                " (BSSID=%pM)\n",
 847                                sdata->dev->name,
 848                                use_short_preamble ? "short" : "long",
 849                                ifmgd->bssid);
 850                 }
 851 #endif
 852                 bss_conf->use_short_preamble = use_short_preamble;
 853                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 854         }
 855
 856         if (use_short_slot != bss_conf->use_short_slot) {
 857 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 858                 if (net_ratelimit()) {
 859                         printk(KERN_DEBUG "%s: switched to %s slot time"
 860                                " (BSSID=%pM)\n",
 861                                sdata->dev->name,
 862                                use_short_slot ? "short" : "long",
 863                                ifmgd->bssid);
 864                 }
 865 #endif
 866                 bss_conf->use_short_slot = use_short_slot;
 867                 changed |= BSS_CHANGED_ERP_SLOT;
 868         }
 869
 870         return changed;
 871 }
 872
 873 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 874                                      u32 bss_info_changed)
 875 {
 876         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 877         struct ieee80211_local *local = sdata->local;
 878         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 879
 880         struct ieee80211_bss *bss;
 881
 882         bss_info_changed |= BSS_CHANGED_ASSOC;
 883         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 884
 885         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 886                                    conf->channel->center_freq,
 887                                    ifmgd->ssid, ifmgd->ssid_len);
 888         if (bss) {
 889                 /* set timing information */
 890                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 891                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 892                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 893
 894                 bss_info_changed |= BSS_CHANGED_BEACON_INT;
 895                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 896                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 897
 898                 cfg80211_hold_bss(&bss->cbss);
 899
 900                 ieee80211_rx_bss_put(local, bss);
 901         }
 902
 903         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 904         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 905
 906         ifmgd->last_probe = jiffies;
 907         ieee80211_led_assoc(local, 1);
 908
 909         sdata->vif.bss_conf.assoc = 1;
 910         /*
 911          * For now just always ask the driver to update the basic rateset
 912          * when we have associated, we aren't checking whether it actually
 913          * changed or not.
 914          */
 915         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 916
 917         /* And the BSSID changed - we're associated now */
 918         bss_info_changed |= BSS_CHANGED_BSSID;
 919
 920         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 921
 922         /* will be same as sdata */
 923         if (local->ps_sdata) {
 924                 mutex_lock(&local->iflist_mtx);
 925                 ieee80211_recalc_ps(local, -1);
 926                 mutex_unlock(&local->iflist_mtx);
 927         }
 928
 929         netif_tx_start_all_queues(sdata->dev);
 930         netif_carrier_on(sdata->dev);
 931 }
 932
 933 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 934 {
 935         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 936         struct ieee80211_local *local = sdata->local;
 937
 938         ifmgd->direct_probe_tries++;
 939         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 940                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 941                        sdata->dev->name, ifmgd->bssid);
 942                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 943                 ieee80211_recalc_idle(local);
 944                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid,
 945                                            GFP_KERNEL);
 946
 947                 /*
 948                  * Most likely AP is not in the range so remove the
 949                  * bss information associated to the AP
 950                  */
 951                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 952                                 sdata->local->hw.conf.channel->center_freq,
 953                                 ifmgd->ssid, ifmgd->ssid_len);
 954
 955                 /*
 956                  * We might have a pending scan which had no chance to run yet
 957                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 958                  * Hence, queue the STAs work again
 959                  */
 960                 queue_work(local->hw.workqueue, &ifmgd->work);
 961                 return;
 962         }
 963
 964         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 965                         sdata->dev->name, ifmgd->bssid,
 966                         ifmgd->direct_probe_tries);
 967
 968         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 969
 970         /* Direct probe is sent to broadcast address as some APs
 971          * will not answer to direct packet in unassociated state.
 972          */
 973         ieee80211_send_probe_req(sdata, NULL,
 974                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 975
 976         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 977 }
 978
 979
 980 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 981 {
 982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 983         struct ieee80211_local *local = sdata->local;
 984         u8 *ies;
 985         size_t ies_len;
 986
 987         ifmgd->auth_tries++;
 988         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 989                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 990                        " timed out\n",
 991                        sdata->dev->name, ifmgd->bssid);
 992                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 993                 ieee80211_recalc_idle(local);
 994                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid,
 995                                            GFP_KERNEL);
 996                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 997                                 sdata->local->hw.conf.channel->center_freq,
 998                                 ifmgd->ssid, ifmgd->ssid_len);
 999
1000                 /*
1001                  * We might have a pending scan which had no chance to run yet
1002                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
1003                  * Hence, queue the STAs work again
1004                  */
1005                 queue_work(local->hw.workqueue, &ifmgd->work);
1006                 return;
1007         }
1008
1009         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1010         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
1011                sdata->dev->name, ifmgd->bssid);
1012
1013         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1014                 ies = ifmgd->sme_auth_ie;
1015                 ies_len = ifmgd->sme_auth_ie_len;
1016         } else {
1017                 ies = NULL;
1018                 ies_len = 0;
1019         }
1020         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
1021                             ifmgd->bssid, 0);
1022         ifmgd->auth_transaction = 2;
1023
1024         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1025 }
1026
1027 /*
1028  * The disassoc 'reason' argument can be either our own reason
1029  * if self disconnected or a reason code from the AP.
1030  */
1031 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1032                                    bool deauth, bool self_disconnected,
1033                                    u16 reason)
1034 {
1035         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1036         struct ieee80211_local *local = sdata->local;
1037         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
1038         struct ieee80211_bss *bss;
1039         struct sta_info *sta;
1040         u32 changed = 0, config_changed = 0;
1041
1042         if (deauth) {
1043                 ifmgd->direct_probe_tries = 0;
1044                 ifmgd->auth_tries = 0;
1045         }
1046         ifmgd->assoc_scan_tries = 0;
1047         ifmgd->assoc_tries = 0;
1048
1049         netif_tx_stop_all_queues(sdata->dev);
1050         netif_carrier_off(sdata->dev);
1051
1052         rcu_read_lock();
1053         sta = sta_info_get(local, ifmgd->bssid);
1054         if (sta)
1055                 ieee80211_sta_tear_down_BA_sessions(sta);
1056         rcu_read_unlock();
1057
1058         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1059                                    conf->channel->center_freq,
1060                                    ifmgd->ssid, ifmgd->ssid_len);
1061
1062         if (bss) {
1063                 cfg80211_unhold_bss(&bss->cbss);
1064                 ieee80211_rx_bss_put(local, bss);
1065         }
1066
1067         if (self_disconnected) {
1068                 if (deauth)
1069                         ieee80211_send_deauth_disassoc(sdata,
1070                                 IEEE80211_STYPE_DEAUTH, reason);
1071                 else
1072                         ieee80211_send_deauth_disassoc(sdata,
1073                                 IEEE80211_STYPE_DISASSOC, reason);
1074         }
1075
1076         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1077         changed |= ieee80211_reset_erp_info(sdata);
1078
1079         ieee80211_led_assoc(local, 0);
1080         changed |= BSS_CHANGED_ASSOC;
1081         sdata->vif.bss_conf.assoc = false;
1082
1083         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1084                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1085                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1086                                 sdata->local->hw.conf.channel->center_freq,
1087                                 ifmgd->ssid, ifmgd->ssid_len);
1088         }
1089
1090         ieee80211_set_wmm_default(sdata);
1091
1092         ieee80211_recalc_idle(local);
1093
1094         /* channel(_type) changes are handled by ieee80211_hw_config */
1095         local->oper_channel_type = NL80211_CHAN_NO_HT;
1096
1097         /* on the next assoc, re-program HT parameters */
1098         sdata->ht_opmode_valid = false;
1099
1100         local->power_constr_level = 0;
1101
1102         del_timer_sync(&local->dynamic_ps_timer);
1103         cancel_work_sync(&local->dynamic_ps_enable_work);
1104
1105         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1106                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1107                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1108         }
1109
1110         ieee80211_hw_config(local, config_changed);
1111
1112         /* And the BSSID changed -- not very interesting here */
1113         changed |= BSS_CHANGED_BSSID;
1114         ieee80211_bss_info_change_notify(sdata, changed);
1115
1116         rcu_read_lock();
1117
1118         sta = sta_info_get(local, ifmgd->bssid);
1119         if (!sta) {
1120                 rcu_read_unlock();
1121                 return;
1122         }
1123
1124         sta_info_unlink(&sta);
1125
1126         rcu_read_unlock();
1127
1128         sta_info_destroy(sta);
1129 }
1130
1131 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1132 {
1133         if (!sdata || !sdata->default_key ||
1134             sdata->default_key->conf.alg != ALG_WEP)
1135                 return 0;
1136         return 1;
1137 }
1138
1139 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1140 {
1141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1142         struct ieee80211_local *local = sdata->local;
1143         struct ieee80211_bss *bss;
1144         int bss_privacy;
1145         int wep_privacy;
1146         int privacy_invoked;
1147
1148         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1149                 return 0;
1150
1151         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1152                                    local->hw.conf.channel->center_freq,
1153                                    ifmgd->ssid, ifmgd->ssid_len);
1154         if (!bss)
1155                 return 0;
1156
1157         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1158         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1159         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1160
1161         ieee80211_rx_bss_put(local, bss);
1162
1163         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1164                 return 0;
1165
1166         return 1;
1167 }
1168
1169 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1170 {
1171         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1172         struct ieee80211_local *local = sdata->local;
1173
1174         ifmgd->assoc_tries++;
1175         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1176                 printk(KERN_DEBUG "%s: association with AP %pM"
1177                        " timed out\n",
1178                        sdata->dev->name, ifmgd->bssid);
1179                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1180                 ieee80211_recalc_idle(local);
1181                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid,
1182                                             GFP_KERNEL);
1183                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1184                                 sdata->local->hw.conf.channel->center_freq,
1185                                 ifmgd->ssid, ifmgd->ssid_len);
1186                 /*
1187                  * We might have a pending scan which had no chance to run yet
1188                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1189                  * Hence, queue the STAs work again
1190                  */
1191                 queue_work(local->hw.workqueue, &ifmgd->work);
1192                 return;
1193         }
1194
1195         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1196         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1197                sdata->dev->name, ifmgd->bssid);
1198         if (ieee80211_privacy_mismatch(sdata)) {
1199                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1200                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1201                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1202                 ieee80211_recalc_idle(local);
1203                 return;
1204         }
1205
1206         ieee80211_send_assoc(sdata);
1207
1208         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1209 }
1210
1211 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1212                              struct ieee80211_hdr *hdr)
1213 {
1214         /*
1215          * We can postpone the mgd.timer whenever receiving unicast frames
1216          * from AP because we know that the connection is working both ways
1217          * at that time. But multicast frames (and hence also beacons) must
1218          * be ignored here, because we need to trigger the timer during
1219          * data idle periods for sending the periodical probe request to
1220          * the AP.
1221          */
1222         if (!is_multicast_ether_addr(hdr->addr1))
1223                 mod_timer(&sdata->u.mgd.timer,
1224                           jiffies + IEEE80211_MONITORING_INTERVAL);
1225 }
1226
1227 void ieee80211_beacon_loss_work(struct work_struct *work)
1228 {
1229         struct ieee80211_sub_if_data *sdata =
1230                 container_of(work, struct ieee80211_sub_if_data,
1231                              u.mgd.beacon_loss_work);
1232         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1233
1234         /*
1235          * The driver has already reported this event and we have
1236          * already sent a probe request. Maybe the AP died and the
1237          * driver keeps reporting until we disassociate... We have
1238          * to ignore that because otherwise we would continually
1239          * reset the timer and never check whether we received a
1240          * probe response!
1241          */
1242         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1243                 return;
1244
1245 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1246         if (net_ratelimit()) {
1247                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1248                        "- sending probe request\n", sdata->dev->name,
1249                        sdata->u.mgd.bssid);
1250         }
1251 #endif
1252
1253         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1254
1255         mutex_lock(&sdata->local->iflist_mtx);
1256         ieee80211_recalc_ps(sdata->local, -1);
1257         mutex_unlock(&sdata->local->iflist_mtx);
1258
1259         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1260                                  ifmgd->ssid_len, NULL, 0);
1261
1262         mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1263 }
1264
1265 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1266 {
1267         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1268
1269         queue_work(sdata->local->hw.workqueue,
1270                    &sdata->u.mgd.beacon_loss_work);
1271 }
1272 EXPORT_SYMBOL(ieee80211_beacon_loss);
1273
1274 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1275 {
1276         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1277         struct ieee80211_local *local = sdata->local;
1278         struct sta_info *sta;
1279         unsigned long last_rx;
1280         bool disassoc = false;
1281
1282         /* TODO: start monitoring current AP signal quality and number of
1283          * missed beacons. Scan other channels every now and then and search
1284          * for better APs. */
1285         /* TODO: remove expired BSSes */
1286
1287         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1288
1289         rcu_read_lock();
1290
1291         sta = sta_info_get(local, ifmgd->bssid);
1292         if (!sta) {
1293                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1294                        sdata->dev->name, ifmgd->bssid);
1295                 disassoc = true;
1296                 rcu_read_unlock();
1297                 goto out;
1298         }
1299
1300         last_rx = sta->last_rx;
1301         rcu_read_unlock();
1302
1303         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1304             time_after(jiffies, last_rx + IEEE80211_PROBE_WAIT)) {
1305                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1306                        "- disassociating\n",
1307                        sdata->dev->name, ifmgd->bssid);
1308                 disassoc = true;
1309                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1310                 goto out;
1311         }
1312
1313         /*
1314          * Beacon filtering is only enabled with power save and then the
1315          * stack should not check for beacon loss.
1316          */
1317         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1318               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1319             time_after(jiffies,
1320                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1321 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1322                 if (net_ratelimit()) {
1323                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1324                                "- sending probe request\n",
1325                                sdata->dev->name, ifmgd->bssid);
1326                 }
1327 #endif
1328                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1329                 mutex_lock(&local->iflist_mtx);
1330                 ieee80211_recalc_ps(local, -1);
1331                 mutex_unlock(&local->iflist_mtx);
1332                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1333                                          ifmgd->ssid_len, NULL, 0);
1334                 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1335                 goto out;
1336         }
1337
1338         if (time_after(jiffies, last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1339                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1340                 mutex_lock(&local->iflist_mtx);
1341                 ieee80211_recalc_ps(local, -1);
1342                 mutex_unlock(&local->iflist_mtx);
1343                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1344                                          ifmgd->ssid_len, NULL, 0);
1345         }
1346
1347  out:
1348         if (!disassoc)
1349                 mod_timer(&ifmgd->timer,
1350                           jiffies + IEEE80211_MONITORING_INTERVAL);
1351         else
1352                 ieee80211_set_disassoc(sdata, true, true,
1353                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1354 }
1355
1356
1357 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1358 {
1359         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1360
1361         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1362         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1363         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1364                 /* Wait for SME to request association */
1365                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1366                 ieee80211_recalc_idle(sdata->local);
1367         } else
1368                 ieee80211_associate(sdata);
1369 }
1370
1371
1372 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1373                                      struct ieee80211_mgmt *mgmt,
1374                                      size_t len)
1375 {
1376         u8 *pos;
1377         struct ieee802_11_elems elems;
1378
1379         pos = mgmt->u.auth.variable;
1380         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1381         if (!elems.challenge)
1382                 return;
1383         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1384                             elems.challenge - 2, elems.challenge_len + 2,
1385                             sdata->u.mgd.bssid, 1);
1386         sdata->u.mgd.auth_transaction = 4;
1387 }
1388
1389 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1390                                    struct ieee80211_mgmt *mgmt,
1391                                    size_t len)
1392 {
1393         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1394         u16 auth_alg, auth_transaction, status_code;
1395
1396         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1397                 return;
1398
1399         if (len < 24 + 6)
1400                 return;
1401
1402         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1403                 return;
1404
1405         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1406                 return;
1407
1408         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1409         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1410         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1411
1412         if (auth_alg != ifmgd->auth_alg ||
1413             auth_transaction != ifmgd->auth_transaction)
1414                 return;
1415
1416         if (status_code != WLAN_STATUS_SUCCESS) {
1417                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1418                         u8 algs[3];
1419                         const int num_algs = ARRAY_SIZE(algs);
1420                         int i, pos;
1421                         algs[0] = algs[1] = algs[2] = 0xff;
1422                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1423                                 algs[0] = WLAN_AUTH_OPEN;
1424                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1425                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1426                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1427                                 algs[2] = WLAN_AUTH_LEAP;
1428                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1429                                 pos = 0;
1430                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1431                                 pos = 1;
1432                         else
1433                                 pos = 2;
1434                         for (i = 0; i < num_algs; i++) {
1435                                 pos++;
1436                                 if (pos >= num_algs)
1437                                         pos = 0;
1438                                 if (algs[pos] == ifmgd->auth_alg ||
1439                                     algs[pos] == 0xff)
1440                                         continue;
1441                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1442                                     !ieee80211_sta_wep_configured(sdata))
1443                                         continue;
1444                                 ifmgd->auth_alg = algs[pos];
1445                                 ifmgd->auth_tries = 0;
1446                                 return;
1447                         }
1448                 }
1449                 /* nothing else to try -- give up */
1450                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len,
1451                                       GFP_KERNEL);
1452                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1453                 ieee80211_recalc_idle(sdata->local);
1454                 return;
1455         }
1456
1457         switch (ifmgd->auth_alg) {
1458         case WLAN_AUTH_OPEN:
1459         case WLAN_AUTH_LEAP:
1460         case WLAN_AUTH_FT:
1461                 ieee80211_auth_completed(sdata);
1462                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len,
1463                                       GFP_KERNEL);
1464                 break;
1465         case WLAN_AUTH_SHARED_KEY:
1466                 if (ifmgd->auth_transaction == 4) {
1467                         ieee80211_auth_completed(sdata);
1468                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len,
1469                                               GFP_KERNEL);
1470                 } else
1471                         ieee80211_auth_challenge(sdata, mgmt, len);
1472                 break;
1473         }
1474 }
1475
1476
1477 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1478                                      struct ieee80211_mgmt *mgmt,
1479                                      size_t len)
1480 {
1481         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1482         u16 reason_code;
1483
1484         if (len < 24 + 2)
1485                 return;
1486
1487         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1488                 return;
1489
1490         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1491
1492         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1493                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1494                                 sdata->dev->name, reason_code);
1495
1496         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1497             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1498              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1499              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1500                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1501                 mod_timer(&ifmgd->timer, jiffies +
1502                                       IEEE80211_RETRY_AUTH_INTERVAL);
1503         }
1504
1505         ieee80211_set_disassoc(sdata, true, false, 0);
1506         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1507         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len, GFP_KERNEL);
1508 }
1509
1510
1511 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1512                                        struct ieee80211_mgmt *mgmt,
1513                                        size_t len)
1514 {
1515         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1516         u16 reason_code;
1517
1518         if (len < 24 + 2)
1519                 return;
1520
1521         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1522                 return;
1523
1524         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1525
1526         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1527                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1528                                 sdata->dev->name, reason_code);
1529
1530         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1531             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1532                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1533                 mod_timer(&ifmgd->timer, jiffies +
1534                                       IEEE80211_RETRY_AUTH_INTERVAL);
1535         }
1536
1537         ieee80211_set_disassoc(sdata, false, false, reason_code);
1538         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len, GFP_KERNEL);
1539 }
1540
1541
1542 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1543                                          struct ieee80211_mgmt *mgmt,
1544                                          size_t len,
1545                                          int reassoc)
1546 {
1547         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1548         struct ieee80211_local *local = sdata->local;
1549         struct ieee80211_supported_band *sband;
1550         struct sta_info *sta;
1551         u32 rates, basic_rates;
1552         u16 capab_info, status_code, aid;
1553         struct ieee802_11_elems elems;
1554         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1555         u8 *pos;
1556         u32 changed = 0;
1557         int i, j;
1558         bool have_higher_than_11mbit = false, newsta = false;
1559         u16 ap_ht_cap_flags;
1560
1561         /* AssocResp and ReassocResp have identical structure, so process both
1562          * of them in this function. */
1563
1564         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1565                 return;
1566
1567         if (len < 24 + 6)
1568                 return;
1569
1570         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1571                 return;
1572
1573         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1574         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1575         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1576
1577         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1578                "status=%d aid=%d)\n",
1579                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1580                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1581
1582         pos = mgmt->u.assoc_resp.variable;
1583         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1584
1585         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1586             elems.timeout_int && elems.timeout_int_len == 5 &&
1587             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1588                 u32 tu, ms;
1589                 tu = get_unaligned_le32(elems.timeout_int + 1);
1590                 ms = tu * 1024 / 1000;
1591                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1592                        "comeback duration %u TU (%u ms)\n",
1593                        sdata->dev->name, tu, ms);
1594                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1595                         mod_timer(&ifmgd->timer,
1596                                   jiffies + msecs_to_jiffies(ms));
1597                 return;
1598         }
1599
1600         if (status_code != WLAN_STATUS_SUCCESS) {
1601                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1602                        sdata->dev->name, status_code);
1603                 /* if this was a reassociation, ensure we try a "full"
1604                  * association next time. This works around some broken APs
1605                  * which do not correctly reject reassociation requests. */
1606                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1607                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len,
1608                                        GFP_KERNEL);
1609                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1610                         /* Wait for SME to decide what to do next */
1611                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1612                         ieee80211_recalc_idle(local);
1613                 }
1614                 return;
1615         }
1616
1617         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1618                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1619                        "set\n", sdata->dev->name, aid);
1620         aid &= ~(BIT(15) | BIT(14));
1621
1622         if (!elems.supp_rates) {
1623                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1624                        sdata->dev->name);
1625                 return;
1626         }
1627
1628         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1629         ifmgd->aid = aid;
1630         ifmgd->ap_capab = capab_info;
1631
1632         kfree(ifmgd->assocresp_ies);
1633         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1634         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1635         if (ifmgd->assocresp_ies)
1636                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1637
1638         rcu_read_lock();
1639
1640         /* Add STA entry for the AP */
1641         sta = sta_info_get(local, ifmgd->bssid);
1642         if (!sta) {
1643                 newsta = true;
1644
1645                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1646                 if (!sta) {
1647                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1648                                " the AP\n", sdata->dev->name);
1649                         rcu_read_unlock();
1650                         return;
1651                 }
1652
1653                 /* update new sta with its last rx activity */
1654                 sta->last_rx = jiffies;
1655         }
1656
1657         /*
1658          * FIXME: Do we really need to update the sta_info's information here?
1659          *        We already know about the AP (we found it in our list) so it
1660          *        should already be filled with the right info, no?
1661          *        As is stands, all this is racy because typically we assume
1662          *        the information that is filled in here (except flags) doesn't
1663          *        change while a STA structure is alive. As such, it should move
1664          *        to between the sta_info_alloc() and sta_info_insert() above.
1665          */
1666
1667         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP);
1668         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1669                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1670
1671         rates = 0;
1672         basic_rates = 0;
1673         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1674
1675         for (i = 0; i < elems.supp_rates_len; i++) {
1676                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1677                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1678
1679                 if (rate > 110)
1680                         have_higher_than_11mbit = true;
1681
1682                 for (j = 0; j < sband->n_bitrates; j++) {
1683                         if (sband->bitrates[j].bitrate == rate) {
1684                                 rates |= BIT(j);
1685                                 if (is_basic)
1686                                         basic_rates |= BIT(j);
1687                                 break;
1688                         }
1689                 }
1690         }
1691
1692         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1693                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1694                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1695
1696                 if (rate > 110)
1697                         have_higher_than_11mbit = true;
1698
1699                 for (j = 0; j < sband->n_bitrates; j++) {
1700                         if (sband->bitrates[j].bitrate == rate) {
1701                                 rates |= BIT(j);
1702                                 if (is_basic)
1703                                         basic_rates |= BIT(j);
1704                                 break;
1705                         }
1706                 }
1707         }
1708
1709         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1710         sdata->vif.bss_conf.basic_rates = basic_rates;
1711
1712         /* cf. IEEE 802.11 9.2.12 */
1713         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1714             have_higher_than_11mbit)
1715                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1716         else
1717                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1718
1719         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1720         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1721                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1722                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1723
1724         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1725
1726         rate_control_rate_init(sta);
1727
1728         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1729                 set_sta_flags(sta, WLAN_STA_MFP);
1730
1731         if (elems.wmm_param)
1732                 set_sta_flags(sta, WLAN_STA_WME);
1733
1734         if (newsta) {
1735                 int err = sta_info_insert(sta);
1736                 if (err) {
1737                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1738                                " the AP (error %d)\n", sdata->dev->name, err);
1739                         rcu_read_unlock();
1740                         return;
1741                 }
1742         }
1743
1744         rcu_read_unlock();
1745
1746         if (elems.wmm_param)
1747                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1748                                          elems.wmm_param_len);
1749         else
1750                 ieee80211_set_wmm_default(sdata);
1751
1752         if (elems.ht_info_elem && elems.wmm_param &&
1753             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1754             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1755                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1756                                                ap_ht_cap_flags);
1757
1758         /* set AID and assoc capability,
1759          * ieee80211_set_associated() will tell the driver */
1760         bss_conf->aid = aid;
1761         bss_conf->assoc_capability = capab_info;
1762         ieee80211_set_associated(sdata, changed);
1763
1764         /*
1765          * initialise the time of last beacon to be the association time,
1766          * otherwise beacon loss check will trigger immediately
1767          */
1768         ifmgd->last_beacon = jiffies;
1769
1770         ieee80211_associated(sdata);
1771         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len, GFP_KERNEL);
1772 }
1773
1774
1775 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1776                                   struct ieee80211_mgmt *mgmt,
1777                                   size_t len,
1778                                   struct ieee80211_rx_status *rx_status,
1779                                   struct ieee802_11_elems *elems,
1780                                   bool beacon)
1781 {
1782         struct ieee80211_local *local = sdata->local;
1783         int freq;
1784         struct ieee80211_bss *bss;
1785         struct ieee80211_channel *channel;
1786
1787         if (elems->ds_params && elems->ds_params_len == 1)
1788                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1789         else
1790                 freq = rx_status->freq;
1791
1792         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1793
1794         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1795                 return;
1796
1797         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1798                                         channel, beacon);
1799         if (!bss)
1800                 return;
1801
1802         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1803             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1804                 struct ieee80211_channel_sw_ie *sw_elem =
1805                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1806                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1807         }
1808
1809         ieee80211_rx_bss_put(local, bss);
1810 }
1811
1812
1813 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1814                                          struct ieee80211_mgmt *mgmt,
1815                                          size_t len,
1816                                          struct ieee80211_rx_status *rx_status)
1817 {
1818         struct ieee80211_if_managed *ifmgd;
1819         size_t baselen;
1820         struct ieee802_11_elems elems;
1821
1822         ifmgd = &sdata->u.mgd;
1823
1824         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1825                 return; /* ignore ProbeResp to foreign address */
1826
1827         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1828         if (baselen > len)
1829                 return;
1830
1831         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1832                                 &elems);
1833
1834         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1835
1836         /* direct probe may be part of the association flow */
1837         if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1838                 printk(KERN_DEBUG "%s direct probe responded\n",
1839                        sdata->dev->name);
1840                 ieee80211_authenticate(sdata);
1841         }
1842
1843         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1844                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1845                 mutex_lock(&sdata->local->iflist_mtx);
1846                 ieee80211_recalc_ps(sdata->local, -1);
1847                 mutex_unlock(&sdata->local->iflist_mtx);
1848         }
1849 }
1850
1851 /*
1852  * This is the canonical list of information elements we care about,
1853  * the filter code also gives us all changes to the Microsoft OUI
1854  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1855  *
1856  * We implement beacon filtering in software since that means we can
1857  * avoid processing the frame here and in cfg80211, and userspace
1858  * will not be able to tell whether the hardware supports it or not.
1859  *
1860  * XXX: This list needs to be dynamic -- userspace needs to be able to
1861  *      add items it requires. It also needs to be able to tell us to
1862  *      look out for other vendor IEs.
1863  */
1864 static const u64 care_about_ies =
1865         (1ULL << WLAN_EID_COUNTRY) |
1866         (1ULL << WLAN_EID_ERP_INFO) |
1867         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1868         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1869         (1ULL << WLAN_EID_HT_CAPABILITY) |
1870         (1ULL << WLAN_EID_HT_INFORMATION);
1871
1872 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1873                                      struct ieee80211_mgmt *mgmt,
1874                                      size_t len,
1875                                      struct ieee80211_rx_status *rx_status)
1876 {
1877         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1878         size_t baselen;
1879         struct ieee802_11_elems elems;
1880         struct ieee80211_local *local = sdata->local;
1881         u32 changed = 0;
1882         bool erp_valid, directed_tim = false;
1883         u8 erp_value = 0;
1884         u32 ncrc;
1885
1886         /* Process beacon from the current BSS */
1887         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1888         if (baselen > len)
1889                 return;
1890
1891         if (rx_status->freq != local->hw.conf.channel->center_freq)
1892                 return;
1893
1894         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1895             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1896                 return;
1897
1898         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1899 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1900                 if (net_ratelimit()) {
1901                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1902                                "to a received beacon\n", sdata->dev->name);
1903                 }
1904 #endif
1905                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1906                 mutex_lock(&local->iflist_mtx);
1907                 ieee80211_recalc_ps(local, -1);
1908                 mutex_unlock(&local->iflist_mtx);
1909         }
1910
1911         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1912         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1913                                           len - baselen, &elems,
1914                                           care_about_ies, ncrc);
1915
1916         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1917                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1918                                                    ifmgd->aid);
1919
1920         if (ncrc != ifmgd->beacon_crc) {
1921                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1922                                       true);
1923
1924                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1925                                          elems.wmm_param_len);
1926         }
1927
1928         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1929                 if (directed_tim) {
1930                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1931                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1932                                 ieee80211_hw_config(local,
1933                                                     IEEE80211_CONF_CHANGE_PS);
1934                                 ieee80211_send_nullfunc(local, sdata, 0);
1935                         } else {
1936                                 local->pspolling = true;
1937
1938                                 /*
1939                                  * Here is assumed that the driver will be
1940                                  * able to send ps-poll frame and receive a
1941                                  * response even though power save mode is
1942                                  * enabled, but some drivers might require
1943                                  * to disable power save here. This needs
1944                                  * to be investigated.
1945                                  */
1946                                 ieee80211_send_pspoll(local, sdata);
1947                         }
1948                 }
1949         }
1950
1951         if (ncrc == ifmgd->beacon_crc)
1952                 return;
1953         ifmgd->beacon_crc = ncrc;
1954
1955         if (elems.erp_info && elems.erp_info_len >= 1) {
1956                 erp_valid = true;
1957                 erp_value = elems.erp_info[0];
1958         } else {
1959                 erp_valid = false;
1960         }
1961         changed |= ieee80211_handle_bss_capability(sdata,
1962                         le16_to_cpu(mgmt->u.beacon.capab_info),
1963                         erp_valid, erp_value);
1964
1965
1966         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1967             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1968                 struct sta_info *sta;
1969                 struct ieee80211_supported_band *sband;
1970                 u16 ap_ht_cap_flags;
1971
1972                 rcu_read_lock();
1973
1974                 sta = sta_info_get(local, ifmgd->bssid);
1975                 if (!sta) {
1976                         rcu_read_unlock();
1977                         return;
1978                 }
1979
1980                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1981
1982                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1983                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1984
1985                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1986
1987                 rcu_read_unlock();
1988
1989                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1990                                                ap_ht_cap_flags);
1991         }
1992
1993         if (elems.country_elem) {
1994                 /* Note we are only reviewing this on beacons
1995                  * for the BSSID we are associated to */
1996                 regulatory_hint_11d(local->hw.wiphy,
1997                         elems.country_elem, elems.country_elem_len);
1998
1999                 /* TODO: IBSS also needs this */
2000                 if (elems.pwr_constr_elem)
2001                         ieee80211_handle_pwr_constr(sdata,
2002                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2003                                 elems.pwr_constr_elem,
2004                                 elems.pwr_constr_elem_len);
2005         }
2006
2007         ieee80211_bss_info_change_notify(sdata, changed);
2008 }
2009
2010 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
2011                                           struct sk_buff *skb)
2012 {
2013         struct ieee80211_local *local = sdata->local;
2014         struct ieee80211_mgmt *mgmt;
2015         u16 fc;
2016
2017         if (skb->len < 24)
2018                 return RX_DROP_MONITOR;
2019
2020         mgmt = (struct ieee80211_mgmt *) skb->data;
2021         fc = le16_to_cpu(mgmt->frame_control);
2022
2023         switch (fc & IEEE80211_FCTL_STYPE) {
2024         case IEEE80211_STYPE_PROBE_REQ:
2025         case IEEE80211_STYPE_PROBE_RESP:
2026         case IEEE80211_STYPE_BEACON:
2027         case IEEE80211_STYPE_AUTH:
2028         case IEEE80211_STYPE_ASSOC_RESP:
2029         case IEEE80211_STYPE_REASSOC_RESP:
2030         case IEEE80211_STYPE_DEAUTH:
2031         case IEEE80211_STYPE_DISASSOC:
2032                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
2033                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
2034                 return RX_QUEUED;
2035         }
2036
2037         return RX_DROP_MONITOR;
2038 }
2039
2040 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2041                                          struct sk_buff *skb)
2042 {
2043         struct ieee80211_rx_status *rx_status;
2044         struct ieee80211_mgmt *mgmt;
2045         u16 fc;
2046
2047         rx_status = (struct ieee80211_rx_status *) skb->cb;
2048         mgmt = (struct ieee80211_mgmt *) skb->data;
2049         fc = le16_to_cpu(mgmt->frame_control);
2050
2051         switch (fc & IEEE80211_FCTL_STYPE) {
2052         case IEEE80211_STYPE_PROBE_RESP:
2053                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2054                                              rx_status);
2055                 break;
2056         case IEEE80211_STYPE_BEACON:
2057                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2058                                          rx_status);
2059                 break;
2060         case IEEE80211_STYPE_AUTH:
2061                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2062                 break;
2063         case IEEE80211_STYPE_ASSOC_RESP:
2064                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
2065                 break;
2066         case IEEE80211_STYPE_REASSOC_RESP:
2067                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
2068                 break;
2069         case IEEE80211_STYPE_DEAUTH:
2070                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2071                 break;
2072         case IEEE80211_STYPE_DISASSOC:
2073                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2074                 break;
2075         }
2076
2077         kfree_skb(skb);
2078 }
2079
2080 static void ieee80211_sta_timer(unsigned long data)
2081 {
2082         struct ieee80211_sub_if_data *sdata =
2083                 (struct ieee80211_sub_if_data *) data;
2084         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2085         struct ieee80211_local *local = sdata->local;
2086
2087         if (local->quiescing) {
2088                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2089                 return;
2090         }
2091
2092         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2093         queue_work(local->hw.workqueue, &ifmgd->work);
2094 }
2095
2096 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
2097 {
2098         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2099         struct ieee80211_local *local = sdata->local;
2100
2101         /* Reset own TSF to allow time synchronization work. */
2102         drv_reset_tsf(local);
2103
2104         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
2105
2106
2107         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2108                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2109         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2110                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2111         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2112                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2113         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2114                 ifmgd->auth_alg = WLAN_AUTH_FT;
2115         else
2116                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2117         ifmgd->auth_transaction = -1;
2118         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2119         ifmgd->assoc_scan_tries = 0;
2120         ifmgd->direct_probe_tries = 0;
2121         ifmgd->auth_tries = 0;
2122         ifmgd->assoc_tries = 0;
2123         netif_tx_stop_all_queues(sdata->dev);
2124         netif_carrier_off(sdata->dev);
2125 }
2126
2127 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2128 {
2129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2130         struct ieee80211_local *local = sdata->local;
2131         struct ieee80211_bss *bss;
2132         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2133         u8 ssid_len = ifmgd->ssid_len;
2134         u16 capa_mask = WLAN_CAPABILITY_ESS;
2135         u16 capa_val = WLAN_CAPABILITY_ESS;
2136         struct ieee80211_channel *chan = local->oper_channel;
2137
2138         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2139             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2140                             IEEE80211_STA_AUTO_BSSID_SEL |
2141                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2142                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2143                 if (sdata->default_key)
2144                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2145         }
2146
2147         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2148                 chan = NULL;
2149
2150         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2151                 bssid = NULL;
2152
2153         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2154                 ssid = NULL;
2155                 ssid_len = 0;
2156         }
2157
2158         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2159                                        bssid, ssid, ssid_len,
2160                                        capa_mask, capa_val);
2161
2162         if (bss) {
2163                 local->oper_channel = bss->cbss.channel;
2164                 local->oper_channel_type = NL80211_CHAN_NO_HT;
2165                 ieee80211_hw_config(local, 0);
2166
2167                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2168                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2169                                                bss->ssid_len);
2170                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2171                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2172                                                     bss->supp_rates);
2173                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2174                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2175                 else
2176                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2177
2178                 /* Send out direct probe if no probe resp was received or
2179                  * the one we have is outdated
2180                  */
2181                 if (!bss->last_probe_resp ||
2182                     time_after(jiffies, bss->last_probe_resp
2183                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2184                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2185                 else
2186                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2187
2188                 ieee80211_rx_bss_put(local, bss);
2189                 ieee80211_sta_reset_auth(sdata);
2190                 return 0;
2191         } else {
2192                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2193
2194                         ifmgd->assoc_scan_tries++;
2195
2196                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2197                                                         ssid_len);
2198
2199                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2200                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2201                 } else {
2202                         ifmgd->assoc_scan_tries = 0;
2203                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2204                         ieee80211_recalc_idle(local);
2205                 }
2206         }
2207         return -1;
2208 }
2209
2210
2211 static void ieee80211_sta_work(struct work_struct *work)
2212 {
2213         struct ieee80211_sub_if_data *sdata =
2214                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2215         struct ieee80211_local *local = sdata->local;
2216         struct ieee80211_if_managed *ifmgd;
2217         struct sk_buff *skb;
2218
2219         if (!netif_running(sdata->dev))
2220                 return;
2221
2222         if (local->sw_scanning || local->hw_scanning)
2223                 return;
2224
2225         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2226                 return;
2227
2228         /*
2229          * Nothing should have been stuffed into the workqueue during
2230          * the suspend->resume cycle. If this WARN is seen then there
2231          * is a bug with either the driver suspend or something in
2232          * mac80211 stuffing into the workqueue which we haven't yet
2233          * cleared during mac80211's suspend cycle.
2234          */
2235         if (WARN_ON(local->suspended))
2236                 return;
2237
2238         ifmgd = &sdata->u.mgd;
2239
2240         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2241                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2242
2243         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2244             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2245             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2246             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2247                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2248                                    round_jiffies_relative(0));
2249                 return;
2250         }
2251
2252         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2253                 if (ieee80211_sta_config_auth(sdata))
2254                         return;
2255                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2256         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2257                 return;
2258
2259         ieee80211_recalc_idle(local);
2260
2261         switch (ifmgd->state) {
2262         case IEEE80211_STA_MLME_DISABLED:
2263                 break;
2264         case IEEE80211_STA_MLME_DIRECT_PROBE:
2265                 ieee80211_direct_probe(sdata);
2266                 break;
2267         case IEEE80211_STA_MLME_AUTHENTICATE:
2268                 ieee80211_authenticate(sdata);
2269                 break;
2270         case IEEE80211_STA_MLME_ASSOCIATE:
2271                 ieee80211_associate(sdata);
2272                 break;
2273         case IEEE80211_STA_MLME_ASSOCIATED:
2274                 ieee80211_associated(sdata);
2275                 break;
2276         default:
2277                 WARN_ON(1);
2278                 break;
2279         }
2280
2281         if (ieee80211_privacy_mismatch(sdata)) {
2282                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2283                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2284
2285                 ieee80211_set_disassoc(sdata, false, true,
2286                                         WLAN_REASON_UNSPECIFIED);
2287         }
2288 }
2289
2290 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2291 {
2292         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2293                 /*
2294                  * Need to update last_beacon to avoid beacon loss
2295                  * test to trigger.
2296                  */
2297                 sdata->u.mgd.last_beacon = jiffies;
2298
2299
2300                 queue_work(sdata->local->hw.workqueue,
2301                            &sdata->u.mgd.work);
2302         }
2303 }
2304
2305 #ifdef CONFIG_PM
2306 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2307 {
2308         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2309
2310         /*
2311          * we need to use atomic bitops for the running bits
2312          * only because both timers might fire at the same
2313          * time -- the code here is properly synchronised.
2314          */
2315
2316         cancel_work_sync(&ifmgd->work);
2317         cancel_work_sync(&ifmgd->beacon_loss_work);
2318         if (del_timer_sync(&ifmgd->timer))
2319                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2320
2321         cancel_work_sync(&ifmgd->chswitch_work);
2322         if (del_timer_sync(&ifmgd->chswitch_timer))
2323                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2324 }
2325
2326 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2327 {
2328         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2329
2330         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2331                 add_timer(&ifmgd->timer);
2332         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2333                 add_timer(&ifmgd->chswitch_timer);
2334 }
2335 #endif
2336
2337 /* interface setup */
2338 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2339 {
2340         struct ieee80211_if_managed *ifmgd;
2341         u32 hw_flags;
2342
2343         ifmgd = &sdata->u.mgd;
2344         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2345         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2346         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2347         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2348                     (unsigned long) sdata);
2349         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2350                     (unsigned long) sdata);
2351         skb_queue_head_init(&ifmgd->skb_queue);
2352
2353         ifmgd->capab = WLAN_CAPABILITY_ESS;
2354         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2355                 IEEE80211_AUTH_ALG_SHARED_KEY;
2356         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2357                 IEEE80211_STA_AUTO_BSSID_SEL |
2358                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2359         if (sdata->local->hw.queues >= 4)
2360                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2361
2362         hw_flags = sdata->local->hw.flags;
2363
2364         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2365                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2366                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2367         }
2368 }
2369
2370 /* configuration hooks */
2371 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2372 {
2373         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2374         struct ieee80211_local *local = sdata->local;
2375
2376         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2377                 return;
2378
2379         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2380                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2381             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2382                              IEEE80211_STA_AUTO_SSID_SEL))) {
2383
2384                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2385                         ieee80211_set_disassoc(sdata, true, true,
2386                                                WLAN_REASON_DEAUTH_LEAVING);
2387
2388                 if (ifmgd->ssid_len == 0) {
2389                         /*
2390                          * Only allow association to be started if a valid SSID
2391                          * is configured.
2392                          */
2393                         return;
2394                 }
2395
2396                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2397                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2398                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2399                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2400                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2401                 queue_work(local->hw.workqueue, &ifmgd->work);
2402         }
2403 }
2404
2405 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2406 {
2407         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2408
2409         if (ifmgd->ssid_len)
2410                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2411         else
2412                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2413
2414         return 0;
2415 }
2416
2417 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2418 {
2419         struct ieee80211_if_managed *ifmgd;
2420
2421         if (len > IEEE80211_MAX_SSID_LEN)
2422                 return -EINVAL;
2423
2424         ifmgd = &sdata->u.mgd;
2425
2426         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2427                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2428                         ieee80211_set_disassoc(sdata, true, true,
2429                                                WLAN_REASON_DEAUTH_LEAVING);
2430
2431                 /*
2432                  * Do not use reassociation if SSID is changed (different ESS).
2433                  */
2434                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2435                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2436                 memcpy(ifmgd->ssid, ssid, len);
2437                 ifmgd->ssid_len = len;
2438         }
2439
2440         return ieee80211_sta_commit(sdata);
2441 }
2442
2443 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2444 {
2445         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2446         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2447         *len = ifmgd->ssid_len;
2448         return 0;
2449 }
2450
2451 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2452 {
2453         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2454
2455         if (compare_ether_addr(bssid, ifmgd->bssid) != 0 &&
2456             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2457                 ieee80211_set_disassoc(sdata, true, true,
2458                                        WLAN_REASON_DEAUTH_LEAVING);
2459
2460         if (is_valid_ether_addr(bssid)) {
2461                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2462                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2463         } else {
2464                 memset(ifmgd->bssid, 0, ETH_ALEN);
2465                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2466         }
2467
2468         return ieee80211_sta_commit(sdata);
2469 }
2470
2471 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2472                                const char *ie, size_t len)
2473 {
2474         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2475
2476         if (len == 0 && ifmgd->extra_ie_len == 0)
2477                 return -EALREADY;
2478
2479         if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
2480             memcmp(ifmgd->extra_ie, ie, len) == 0)
2481                 return -EALREADY;
2482
2483         kfree(ifmgd->extra_ie);
2484         if (len == 0) {
2485                 ifmgd->extra_ie = NULL;
2486                 ifmgd->extra_ie_len = 0;
2487                 return 0;
2488         }
2489         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2490         if (!ifmgd->extra_ie) {
2491                 ifmgd->extra_ie_len = 0;
2492                 return -ENOMEM;
2493         }
2494         memcpy(ifmgd->extra_ie, ie, len);
2495         ifmgd->extra_ie_len = len;
2496         return 0;
2497 }
2498
2499 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2500 {
2501         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2502                sdata->dev->name, reason);
2503
2504         ieee80211_set_disassoc(sdata, true, true, reason);
2505         return 0;
2506 }
2507
2508 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2509 {
2510         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2511
2512         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2513                sdata->dev->name, reason);
2514
2515         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2516                 return -ENOLINK;
2517
2518         ieee80211_set_disassoc(sdata, false, true, reason);
2519         return 0;
2520 }
2521
2522 /* scan finished notification */
2523 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2524 {
2525         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2526
2527         /* Restart STA timers */
2528         rcu_read_lock();
2529         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2530                 ieee80211_restart_sta_timer(sdata);
2531         rcu_read_unlock();
2532 }
2533
2534 int ieee80211_max_network_latency(struct notifier_block *nb,
2535                                   unsigned long data, void *dummy)
2536 {
2537         s32 latency_usec = (s32) data;
2538         struct ieee80211_local *local =
2539                 container_of(nb, struct ieee80211_local,
2540                              network_latency_notifier);
2541
2542         mutex_lock(&local->iflist_mtx);
2543         ieee80211_recalc_ps(local, latency_usec);
2544         mutex_unlock(&local->iflist_mtx);
2545
2546         return 0;
2547 }