git.oblomov.eu Git - linux-2.6/blob - 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 "rate.h"
  27 #include "led.h"
  28
  29 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  35 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  36 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  37
  38 /* utils */
  39 static int ecw2cw(int ecw)
  40 {
  41         return (1 << ecw) - 1;
  42 }
  43
  44 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  45 {
  46         u8 *end, *pos;
  47
  48         pos = bss->cbss.information_elements;
  49         if (pos == NULL)
  50                 return NULL;
  51         end = pos + bss->cbss.len_information_elements;
  52
  53         while (pos + 1 < end) {
  54                 if (pos + 2 + pos[1] > end)
  55                         break;
  56                 if (pos[0] == ie)
  57                         return pos;
  58                 pos += 2 + pos[1];
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  65                                       struct ieee80211_supported_band *sband,
  66                                       u32 *rates)
  67 {
  68         int i, j, count;
  69         *rates = 0;
  70         count = 0;
  71         for (i = 0; i < bss->supp_rates_len; i++) {
  72                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  73
  74                 for (j = 0; j < sband->n_bitrates; j++)
  75                         if (sband->bitrates[j].bitrate == rate) {
  76                                 *rates |= BIT(j);
  77                                 count++;
  78                                 break;
  79                         }
  80         }
  81
  82         return count;
  83 }
  84
  85 /*
  86  * ieee80211_enable_ht should be called only after the operating band
  87  * has been determined as ht configuration depends on the hw's
  88  * HT abilities for a specific band.
  89  */
  90 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  91                                struct ieee80211_ht_info *hti,
  92                                u16 ap_ht_cap_flags)
  93 {
  94         struct ieee80211_local *local = sdata->local;
  95         struct ieee80211_supported_band *sband;
  96         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  97         struct ieee80211_bss_ht_conf ht;
  98         struct sta_info *sta;
  99         u32 changed = 0;
 100         bool enable_ht = true, ht_changed;
 101         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 102
 103         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 104
 105         memset(&ht, 0, sizeof(ht));
 106
 107         /* HT is not supported */
 108         if (!sband->ht_cap.ht_supported)
 109                 enable_ht = false;
 110
 111         /* check that channel matches the right operating channel */
 112         if (local->hw.conf.channel->center_freq !=
 113             ieee80211_channel_to_frequency(hti->control_chan))
 114                 enable_ht = false;
 115
 116         if (enable_ht) {
 117                 channel_type = NL80211_CHAN_HT20;
 118
 119                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 120                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 121                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 122                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 123                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 124                                 channel_type = NL80211_CHAN_HT40PLUS;
 125                                 break;
 126                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 127                                 channel_type = NL80211_CHAN_HT40MINUS;
 128                                 break;
 129                         }
 130                 }
 131         }
 132
 133         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 134                      channel_type != local->hw.conf.channel_type;
 135
 136         local->oper_channel_type = channel_type;
 137
 138         if (ht_changed) {
 139                 /* channel_type change automatically detected */
 140                 ieee80211_hw_config(local, 0);
 141
 142                 rcu_read_lock();
 143
 144                 sta = sta_info_get(local, ifmgd->bssid);
 145                 if (sta)
 146                         rate_control_rate_update(local, sband, sta,
 147                                                  IEEE80211_RC_HT_CHANGED);
 148
 149                 rcu_read_unlock();
 150
 151         }
 152
 153         /* disable HT */
 154         if (!enable_ht)
 155                 return 0;
 156
 157         ht.operation_mode = le16_to_cpu(hti->operation_mode);
 158
 159         /* if bss configuration changed store the new one */
 160         if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
 161                 changed |= BSS_CHANGED_HT;
 162                 sdata->vif.bss_conf.ht = ht;
 163         }
 164
 165         return changed;
 166 }
 167
 168 /* frame sending functions */
 169
 170 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 171 {
 172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 173         struct ieee80211_local *local = sdata->local;
 174         struct sk_buff *skb;
 175         struct ieee80211_mgmt *mgmt;
 176         u8 *pos, *ies, *ht_ie;
 177         int i, len, count, rates_len, supp_rates_len;
 178         u16 capab;
 179         struct ieee80211_bss *bss;
 180         int wmm = 0;
 181         struct ieee80211_supported_band *sband;
 182         u32 rates = 0;
 183
 184         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 185                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 186                             ifmgd->ssid_len);
 187         if (!skb) {
 188                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 189                        "frame\n", sdata->dev->name);
 190                 return;
 191         }
 192         skb_reserve(skb, local->hw.extra_tx_headroom);
 193
 194         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 195
 196         capab = ifmgd->capab;
 197
 198         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 199                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 200                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 201                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 202                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 203         }
 204
 205         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 206                                    local->hw.conf.channel->center_freq,
 207                                    ifmgd->ssid, ifmgd->ssid_len);
 208         if (bss) {
 209                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 210                         capab |= WLAN_CAPABILITY_PRIVACY;
 211                 if (bss->wmm_used)
 212                         wmm = 1;
 213
 214                 /* get all rates supported by the device and the AP as
 215                  * some APs don't like getting a superset of their rates
 216                  * in the association request (e.g. D-Link DAP 1353 in
 217                  * b-only mode) */
 218                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 219
 220                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 221                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 222                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 223
 224                 ieee80211_rx_bss_put(local, bss);
 225         } else {
 226                 rates = ~0;
 227                 rates_len = sband->n_bitrates;
 228         }
 229
 230         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 231         memset(mgmt, 0, 24);
 232         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 233         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 234         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 235
 236         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 237                 skb_put(skb, 10);
 238                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 239                                                   IEEE80211_STYPE_REASSOC_REQ);
 240                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 241                 mgmt->u.reassoc_req.listen_interval =
 242                                 cpu_to_le16(local->hw.conf.listen_interval);
 243                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 244                        ETH_ALEN);
 245         } else {
 246                 skb_put(skb, 4);
 247                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 248                                                   IEEE80211_STYPE_ASSOC_REQ);
 249                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 250                 mgmt->u.assoc_req.listen_interval =
 251                                 cpu_to_le16(local->hw.conf.listen_interval);
 252         }
 253
 254         /* SSID */
 255         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 256         *pos++ = WLAN_EID_SSID;
 257         *pos++ = ifmgd->ssid_len;
 258         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 259
 260         /* add all rates which were marked to be used above */
 261         supp_rates_len = rates_len;
 262         if (supp_rates_len > 8)
 263                 supp_rates_len = 8;
 264
 265         len = sband->n_bitrates;
 266         pos = skb_put(skb, supp_rates_len + 2);
 267         *pos++ = WLAN_EID_SUPP_RATES;
 268         *pos++ = supp_rates_len;
 269
 270         count = 0;
 271         for (i = 0; i < sband->n_bitrates; i++) {
 272                 if (BIT(i) & rates) {
 273                         int rate = sband->bitrates[i].bitrate;
 274                         *pos++ = (u8) (rate / 5);
 275                         if (++count == 8)
 276                                 break;
 277                 }
 278         }
 279
 280         if (rates_len > count) {
 281                 pos = skb_put(skb, rates_len - count + 2);
 282                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 283                 *pos++ = rates_len - count;
 284
 285                 for (i++; i < sband->n_bitrates; i++) {
 286                         if (BIT(i) & rates) {
 287                                 int rate = sband->bitrates[i].bitrate;
 288                                 *pos++ = (u8) (rate / 5);
 289                         }
 290                 }
 291         }
 292
 293         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 294                 /* 1. power capabilities */
 295                 pos = skb_put(skb, 4);
 296                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 297                 *pos++ = 2;
 298                 *pos++ = 0; /* min tx power */
 299                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 300
 301                 /* 2. supported channels */
 302                 /* TODO: get this in reg domain format */
 303                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 304                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 305                 *pos++ = 2 * sband->n_channels;
 306                 for (i = 0; i < sband->n_channels; i++) {
 307                         *pos++ = ieee80211_frequency_to_channel(
 308                                         sband->channels[i].center_freq);
 309                         *pos++ = 1; /* one channel in the subband*/
 310                 }
 311         }
 312
 313         if (ifmgd->extra_ie) {
 314                 pos = skb_put(skb, ifmgd->extra_ie_len);
 315                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 316         }
 317
 318         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 319                 pos = skb_put(skb, 9);
 320                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 321                 *pos++ = 7; /* len */
 322                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 323                 *pos++ = 0x50;
 324                 *pos++ = 0xf2;
 325                 *pos++ = 2; /* WME */
 326                 *pos++ = 0; /* WME info */
 327                 *pos++ = 1; /* WME ver */
 328                 *pos++ = 0;
 329         }
 330
 331         /* wmm support is a must to HT */
 332         /*
 333          * IEEE802.11n does not allow TKIP/WEP as pairwise
 334          * ciphers in HT mode. We still associate in non-ht
 335          * mode (11a/b/g) if any one of these ciphers is
 336          * configured as pairwise.
 337          */
 338         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 339             sband->ht_cap.ht_supported &&
 340             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 341             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 342             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 343                 struct ieee80211_ht_info *ht_info =
 344                         (struct ieee80211_ht_info *)(ht_ie + 2);
 345                 u16 cap = sband->ht_cap.cap;
 346                 __le16 tmp;
 347                 u32 flags = local->hw.conf.channel->flags;
 348
 349                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 350                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 351                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 352                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 353                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 354                         }
 355                         break;
 356                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 357                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 358                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 359                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 360                         }
 361                         break;
 362                 }
 363
 364                 tmp = cpu_to_le16(cap);
 365                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 366                 *pos++ = WLAN_EID_HT_CAPABILITY;
 367                 *pos++ = sizeof(struct ieee80211_ht_cap);
 368                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 369                 memcpy(pos, &tmp, sizeof(u16));
 370                 pos += sizeof(u16);
 371                 /* TODO: needs a define here for << 2 */
 372                 *pos++ = sband->ht_cap.ampdu_factor |
 373                          (sband->ht_cap.ampdu_density << 2);
 374                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 375         }
 376
 377         kfree(ifmgd->assocreq_ies);
 378         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 379         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 380         if (ifmgd->assocreq_ies)
 381                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 382
 383         ieee80211_tx_skb(sdata, skb, 0);
 384 }
 385
 386
 387 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 388                                            u16 stype, u16 reason)
 389 {
 390         struct ieee80211_local *local = sdata->local;
 391         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 392         struct sk_buff *skb;
 393         struct ieee80211_mgmt *mgmt;
 394
 395         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 396         if (!skb) {
 397                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 398                        "deauth/disassoc frame\n", sdata->dev->name);
 399                 return;
 400         }
 401         skb_reserve(skb, local->hw.extra_tx_headroom);
 402
 403         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 404         memset(mgmt, 0, 24);
 405         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 406         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 407         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 408         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 409         skb_put(skb, 2);
 410         /* u.deauth.reason_code == u.disassoc.reason_code */
 411         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 412
 413         if (stype == IEEE80211_STYPE_DEAUTH)
 414                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
 415         else
 416                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
 417         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 418 }
 419
 420 void ieee80211_send_pspoll(struct ieee80211_local *local,
 421                            struct ieee80211_sub_if_data *sdata)
 422 {
 423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 424         struct ieee80211_pspoll *pspoll;
 425         struct sk_buff *skb;
 426         u16 fc;
 427
 428         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 429         if (!skb) {
 430                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 431                        "pspoll frame\n", sdata->dev->name);
 432                 return;
 433         }
 434         skb_reserve(skb, local->hw.extra_tx_headroom);
 435
 436         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 437         memset(pspoll, 0, sizeof(*pspoll));
 438         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 439         pspoll->frame_control = cpu_to_le16(fc);
 440         pspoll->aid = cpu_to_le16(ifmgd->aid);
 441
 442         /* aid in PS-Poll has its two MSBs each set to 1 */
 443         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 444
 445         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 446         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 447
 448         ieee80211_tx_skb(sdata, skb, 0);
 449 }
 450
 451 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 452                              struct ieee80211_sub_if_data *sdata,
 453                              int powersave)
 454 {
 455         struct sk_buff *skb;
 456         struct ieee80211_hdr *nullfunc;
 457         __le16 fc;
 458
 459         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 460                 return;
 461
 462         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 463         if (!skb) {
 464                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 465                        "frame\n", sdata->dev->name);
 466                 return;
 467         }
 468         skb_reserve(skb, local->hw.extra_tx_headroom);
 469
 470         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 471         memset(nullfunc, 0, 24);
 472         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 473                          IEEE80211_FCTL_TODS);
 474         if (powersave)
 475                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 476         nullfunc->frame_control = fc;
 477         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 478         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 479         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 480
 481         ieee80211_tx_skb(sdata, skb, 0);
 482 }
 483
 484 /* powersave */
 485 static void ieee80211_enable_ps(struct ieee80211_local *local,
 486                                 struct ieee80211_sub_if_data *sdata)
 487 {
 488         struct ieee80211_conf *conf = &local->hw.conf;
 489
 490         /*
 491          * If we are scanning right now then the parameters will
 492          * take effect when scan finishes.
 493          */
 494         if (local->hw_scanning || local->sw_scanning)
 495                 return;
 496
 497         if (conf->dynamic_ps_timeout > 0 &&
 498             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 499                 mod_timer(&local->dynamic_ps_timer, jiffies +
 500                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 501         } else {
 502                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 503                         ieee80211_send_nullfunc(local, sdata, 1);
 504                 conf->flags |= IEEE80211_CONF_PS;
 505                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 506         }
 507 }
 508
 509 static void ieee80211_change_ps(struct ieee80211_local *local)
 510 {
 511         struct ieee80211_conf *conf = &local->hw.conf;
 512
 513         if (local->ps_sdata) {
 514                 if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
 515                         return;
 516
 517                 ieee80211_enable_ps(local, local->ps_sdata);
 518         } else if (conf->flags & IEEE80211_CONF_PS) {
 519                 conf->flags &= ~IEEE80211_CONF_PS;
 520                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 521                 del_timer_sync(&local->dynamic_ps_timer);
 522                 cancel_work_sync(&local->dynamic_ps_enable_work);
 523         }
 524 }
 525
 526 /* need to hold RTNL or interface lock */
 527 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 528 {
 529         struct ieee80211_sub_if_data *sdata, *found = NULL;
 530         int count = 0;
 531
 532         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 533                 local->ps_sdata = NULL;
 534                 return;
 535         }
 536
 537         list_for_each_entry(sdata, &local->interfaces, list) {
 538                 if (!netif_running(sdata->dev))
 539                         continue;
 540                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 541                         continue;
 542                 found = sdata;
 543                 count++;
 544         }
 545
 546         if (count == 1 && found->u.mgd.powersave) {
 547                 s32 beaconint_us;
 548
 549                 if (latency < 0)
 550                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 551
 552                 beaconint_us = ieee80211_tu_to_usec(
 553                                         found->vif.bss_conf.beacon_int);
 554
 555                 if (beaconint_us > latency) {
 556                         local->ps_sdata = NULL;
 557                 } else {
 558                         u8 dtimper = found->vif.bss_conf.dtim_period;
 559                         int maxslp = 1;
 560
 561                         if (dtimper > 1)
 562                                 maxslp = min_t(int, dtimper,
 563                                                     latency / beaconint_us);
 564
 565                         local->hw.conf.max_sleep_period = maxslp;
 566                         local->ps_sdata = found;
 567                 }
 568         } else {
 569                 local->ps_sdata = NULL;
 570         }
 571
 572         ieee80211_change_ps(local);
 573 }
 574
 575 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 576 {
 577         struct ieee80211_local *local =
 578                 container_of(work, struct ieee80211_local,
 579                              dynamic_ps_disable_work);
 580
 581         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 582                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 583                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 584         }
 585
 586         ieee80211_wake_queues_by_reason(&local->hw,
 587                                         IEEE80211_QUEUE_STOP_REASON_PS);
 588 }
 589
 590 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 591 {
 592         struct ieee80211_local *local =
 593                 container_of(work, struct ieee80211_local,
 594                              dynamic_ps_enable_work);
 595         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 596
 597         /* can only happen when PS was just disabled anyway */
 598         if (!sdata)
 599                 return;
 600
 601         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 602                 return;
 603
 604         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 605                 ieee80211_send_nullfunc(local, sdata, 1);
 606
 607         local->hw.conf.flags |= IEEE80211_CONF_PS;
 608         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 609 }
 610
 611 void ieee80211_dynamic_ps_timer(unsigned long data)
 612 {
 613         struct ieee80211_local *local = (void *) data;
 614
 615         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 616 }
 617
 618 /* MLME */
 619 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 620                                      struct ieee80211_if_managed *ifmgd,
 621                                      u8 *wmm_param, size_t wmm_param_len)
 622 {
 623         struct ieee80211_tx_queue_params params;
 624         size_t left;
 625         int count;
 626         u8 *pos;
 627
 628         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 629                 return;
 630
 631         if (!wmm_param)
 632                 return;
 633
 634         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 635                 return;
 636         count = wmm_param[6] & 0x0f;
 637         if (count == ifmgd->wmm_last_param_set)
 638                 return;
 639         ifmgd->wmm_last_param_set = count;
 640
 641         pos = wmm_param + 8;
 642         left = wmm_param_len - 8;
 643
 644         memset(&params, 0, sizeof(params));
 645
 646         local->wmm_acm = 0;
 647         for (; left >= 4; left -= 4, pos += 4) {
 648                 int aci = (pos[0] >> 5) & 0x03;
 649                 int acm = (pos[0] >> 4) & 0x01;
 650                 int queue;
 651
 652                 switch (aci) {
 653                 case 1: /* AC_BK */
 654                         queue = 3;
 655                         if (acm)
 656                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 657                         break;
 658                 case 2: /* AC_VI */
 659                         queue = 1;
 660                         if (acm)
 661                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 662                         break;
 663                 case 3: /* AC_VO */
 664                         queue = 0;
 665                         if (acm)
 666                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 667                         break;
 668                 case 0: /* AC_BE */
 669                 default:
 670                         queue = 2;
 671                         if (acm)
 672                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 673                         break;
 674                 }
 675
 676                 params.aifs = pos[0] & 0x0f;
 677                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 678                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 679                 params.txop = get_unaligned_le16(pos + 2);
 680 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 681                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 682                        "cWmin=%d cWmax=%d txop=%d\n",
 683                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 684                        params.cw_max, params.txop);
 685 #endif
 686                 if (local->ops->conf_tx &&
 687                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 688                         printk(KERN_DEBUG "%s: failed to set TX queue "
 689                                "parameters for queue %d\n", local->mdev->name, queue);
 690                 }
 691         }
 692 }
 693
 694 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 695                                            u16 capab, bool erp_valid, u8 erp)
 696 {
 697         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 698 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 699         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 700 #endif
 701         u32 changed = 0;
 702         bool use_protection;
 703         bool use_short_preamble;
 704         bool use_short_slot;
 705
 706         if (erp_valid) {
 707                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 708                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 709         } else {
 710                 use_protection = false;
 711                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 712         }
 713
 714         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 715
 716         if (use_protection != bss_conf->use_cts_prot) {
 717 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 718                 if (net_ratelimit()) {
 719                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 720                                sdata->dev->name,
 721                                use_protection ? "enabled" : "disabled",
 722                                ifmgd->bssid);
 723                 }
 724 #endif
 725                 bss_conf->use_cts_prot = use_protection;
 726                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 727         }
 728
 729         if (use_short_preamble != bss_conf->use_short_preamble) {
 730 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 731                 if (net_ratelimit()) {
 732                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 733                                " (BSSID=%pM)\n",
 734                                sdata->dev->name,
 735                                use_short_preamble ? "short" : "long",
 736                                ifmgd->bssid);
 737                 }
 738 #endif
 739                 bss_conf->use_short_preamble = use_short_preamble;
 740                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 741         }
 742
 743         if (use_short_slot != bss_conf->use_short_slot) {
 744 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 745                 if (net_ratelimit()) {
 746                         printk(KERN_DEBUG "%s: switched to %s slot time"
 747                                " (BSSID=%pM)\n",
 748                                sdata->dev->name,
 749                                use_short_slot ? "short" : "long",
 750                                ifmgd->bssid);
 751                 }
 752 #endif
 753                 bss_conf->use_short_slot = use_short_slot;
 754                 changed |= BSS_CHANGED_ERP_SLOT;
 755         }
 756
 757         return changed;
 758 }
 759
 760 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 761 {
 762         union iwreq_data wrqu;
 763
 764         memset(&wrqu, 0, sizeof(wrqu));
 765         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 766                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 767         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 768         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 769 }
 770
 771 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 772 {
 773         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 774         char *buf;
 775         size_t len;
 776         int i;
 777         union iwreq_data wrqu;
 778
 779         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 780                 return;
 781
 782         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 783                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 784         if (!buf)
 785                 return;
 786
 787         len = sprintf(buf, "ASSOCINFO(");
 788         if (ifmgd->assocreq_ies) {
 789                 len += sprintf(buf + len, "ReqIEs=");
 790                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 791                         len += sprintf(buf + len, "%02x",
 792                                        ifmgd->assocreq_ies[i]);
 793                 }
 794         }
 795         if (ifmgd->assocresp_ies) {
 796                 if (ifmgd->assocreq_ies)
 797                         len += sprintf(buf + len, " ");
 798                 len += sprintf(buf + len, "RespIEs=");
 799                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 800                         len += sprintf(buf + len, "%02x",
 801                                        ifmgd->assocresp_ies[i]);
 802                 }
 803         }
 804         len += sprintf(buf + len, ")");
 805
 806         if (len > IW_CUSTOM_MAX) {
 807                 len = sprintf(buf, "ASSOCRESPIE=");
 808                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 809                         len += sprintf(buf + len, "%02x",
 810                                        ifmgd->assocresp_ies[i]);
 811                 }
 812         }
 813
 814         if (len <= IW_CUSTOM_MAX) {
 815                 memset(&wrqu, 0, sizeof(wrqu));
 816                 wrqu.data.length = len;
 817                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 818         }
 819
 820         kfree(buf);
 821 }
 822
 823
 824 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 825                                      u32 bss_info_changed)
 826 {
 827         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 828         struct ieee80211_local *local = sdata->local;
 829         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 830
 831         struct ieee80211_bss *bss;
 832
 833         bss_info_changed |= BSS_CHANGED_ASSOC;
 834         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 835
 836         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 837                                    conf->channel->center_freq,
 838                                    ifmgd->ssid, ifmgd->ssid_len);
 839         if (bss) {
 840                 /* set timing information */
 841                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 842                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 843                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 844
 845                 bss_info_changed |= BSS_CHANGED_BEACON_INT;
 846                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 847                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 848
 849                 cfg80211_hold_bss(&bss->cbss);
 850
 851                 ieee80211_rx_bss_put(local, bss);
 852         }
 853
 854         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 855         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 856         ieee80211_sta_send_associnfo(sdata);
 857
 858         ifmgd->last_probe = jiffies;
 859         ieee80211_led_assoc(local, 1);
 860
 861         sdata->vif.bss_conf.assoc = 1;
 862         /*
 863          * For now just always ask the driver to update the basic rateset
 864          * when we have associated, we aren't checking whether it actually
 865          * changed or not.
 866          */
 867         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 868         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 869
 870         /* will be same as sdata */
 871         if (local->ps_sdata) {
 872                 mutex_lock(&local->iflist_mtx);
 873                 ieee80211_recalc_ps(local, -1);
 874                 mutex_unlock(&local->iflist_mtx);
 875         }
 876
 877         netif_tx_start_all_queues(sdata->dev);
 878         netif_carrier_on(sdata->dev);
 879
 880         ieee80211_sta_send_apinfo(sdata);
 881 }
 882
 883 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 884 {
 885         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 886         struct ieee80211_local *local = sdata->local;
 887
 888         ifmgd->direct_probe_tries++;
 889         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 890                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 891                        sdata->dev->name, ifmgd->bssid);
 892                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 893                 ieee80211_sta_send_apinfo(sdata);
 894
 895                 /*
 896                  * Most likely AP is not in the range so remove the
 897                  * bss information associated to the AP
 898                  */
 899                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 900                                 sdata->local->hw.conf.channel->center_freq,
 901                                 ifmgd->ssid, ifmgd->ssid_len);
 902
 903                 /*
 904                  * We might have a pending scan which had no chance to run yet
 905                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 906                  * Hence, queue the STAs work again
 907                  */
 908                 queue_work(local->hw.workqueue, &ifmgd->work);
 909                 return;
 910         }
 911
 912         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 913                         sdata->dev->name, ifmgd->bssid,
 914                         ifmgd->direct_probe_tries);
 915
 916         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 917
 918         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 919
 920         /* Direct probe is sent to broadcast address as some APs
 921          * will not answer to direct packet in unassociated state.
 922          */
 923         ieee80211_send_probe_req(sdata, NULL,
 924                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 925
 926         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 927 }
 928
 929
 930 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 931 {
 932         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 933         struct ieee80211_local *local = sdata->local;
 934         u8 *ies;
 935         size_t ies_len;
 936
 937         ifmgd->auth_tries++;
 938         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 939                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 940                        " timed out\n",
 941                        sdata->dev->name, ifmgd->bssid);
 942                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 943                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
 944                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 945                                 sdata->local->hw.conf.channel->center_freq,
 946                                 ifmgd->ssid, ifmgd->ssid_len);
 947
 948                 /*
 949                  * We might have a pending scan which had no chance to run yet
 950                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 951                  * Hence, queue the STAs work again
 952                  */
 953                 queue_work(local->hw.workqueue, &ifmgd->work);
 954                 return;
 955         }
 956
 957         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 958         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 959                sdata->dev->name, ifmgd->bssid);
 960
 961         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 962                 ies = ifmgd->sme_auth_ie;
 963                 ies_len = ifmgd->sme_auth_ie_len;
 964         } else {
 965                 ies = NULL;
 966                 ies_len = 0;
 967         }
 968         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 969                             ifmgd->bssid, 0);
 970         ifmgd->auth_transaction = 2;
 971
 972         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 973 }
 974
 975 /*
 976  * The disassoc 'reason' argument can be either our own reason
 977  * if self disconnected or a reason code from the AP.
 978  */
 979 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 980                                    bool deauth, bool self_disconnected,
 981                                    u16 reason)
 982 {
 983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 984         struct ieee80211_local *local = sdata->local;
 985         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 986         struct ieee80211_bss *bss;
 987         struct sta_info *sta;
 988         u32 changed = 0, config_changed = 0;
 989
 990         rcu_read_lock();
 991
 992         sta = sta_info_get(local, ifmgd->bssid);
 993         if (!sta) {
 994                 rcu_read_unlock();
 995                 return;
 996         }
 997
 998         if (deauth) {
 999                 ifmgd->direct_probe_tries = 0;
1000                 ifmgd->auth_tries = 0;
1001         }
1002         ifmgd->assoc_scan_tries = 0;
1003         ifmgd->assoc_tries = 0;
1004
1005         netif_tx_stop_all_queues(sdata->dev);
1006         netif_carrier_off(sdata->dev);
1007
1008         ieee80211_sta_tear_down_BA_sessions(sta);
1009
1010         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1011                                    conf->channel->center_freq,
1012                                    ifmgd->ssid, ifmgd->ssid_len);
1013
1014         if (bss) {
1015                 cfg80211_unhold_bss(&bss->cbss);
1016                 ieee80211_rx_bss_put(local, bss);
1017         }
1018
1019         if (self_disconnected) {
1020                 if (deauth)
1021                         ieee80211_send_deauth_disassoc(sdata,
1022                                 IEEE80211_STYPE_DEAUTH, reason);
1023                 else
1024                         ieee80211_send_deauth_disassoc(sdata,
1025                                 IEEE80211_STYPE_DISASSOC, reason);
1026         }
1027
1028         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1029         changed |= ieee80211_reset_erp_info(sdata);
1030
1031         ieee80211_led_assoc(local, 0);
1032         changed |= BSS_CHANGED_ASSOC;
1033         sdata->vif.bss_conf.assoc = false;
1034
1035         ieee80211_sta_send_apinfo(sdata);
1036
1037         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1038                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1039                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1040                                 sdata->local->hw.conf.channel->center_freq,
1041                                 ifmgd->ssid, ifmgd->ssid_len);
1042         }
1043
1044         rcu_read_unlock();
1045
1046         /* channel(_type) changes are handled by ieee80211_hw_config */
1047         local->oper_channel_type = NL80211_CHAN_NO_HT;
1048
1049         local->power_constr_level = 0;
1050
1051         del_timer_sync(&local->dynamic_ps_timer);
1052         cancel_work_sync(&local->dynamic_ps_enable_work);
1053
1054         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1055                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1056                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1057         }
1058
1059         ieee80211_hw_config(local, config_changed);
1060         ieee80211_bss_info_change_notify(sdata, changed);
1061
1062         rcu_read_lock();
1063
1064         sta = sta_info_get(local, ifmgd->bssid);
1065         if (!sta) {
1066                 rcu_read_unlock();
1067                 return;
1068         }
1069
1070         sta_info_unlink(&sta);
1071
1072         rcu_read_unlock();
1073
1074         sta_info_destroy(sta);
1075 }
1076
1077 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1078 {
1079         if (!sdata || !sdata->default_key ||
1080             sdata->default_key->conf.alg != ALG_WEP)
1081                 return 0;
1082         return 1;
1083 }
1084
1085 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1086 {
1087         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1088         struct ieee80211_local *local = sdata->local;
1089         struct ieee80211_bss *bss;
1090         int bss_privacy;
1091         int wep_privacy;
1092         int privacy_invoked;
1093
1094         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1095                 return 0;
1096
1097         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1098                                    local->hw.conf.channel->center_freq,
1099                                    ifmgd->ssid, ifmgd->ssid_len);
1100         if (!bss)
1101                 return 0;
1102
1103         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1104         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1105         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1106
1107         ieee80211_rx_bss_put(local, bss);
1108
1109         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1110                 return 0;
1111
1112         return 1;
1113 }
1114
1115 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1116 {
1117         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1118         struct ieee80211_local *local = sdata->local;
1119
1120         ifmgd->assoc_tries++;
1121         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1122                 printk(KERN_DEBUG "%s: association with AP %pM"
1123                        " timed out\n",
1124                        sdata->dev->name, ifmgd->bssid);
1125                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1126                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1127                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1128                                 sdata->local->hw.conf.channel->center_freq,
1129                                 ifmgd->ssid, ifmgd->ssid_len);
1130                 /*
1131                  * We might have a pending scan which had no chance to run yet
1132                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1133                  * Hence, queue the STAs work again
1134                  */
1135                 queue_work(local->hw.workqueue, &ifmgd->work);
1136                 return;
1137         }
1138
1139         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1140         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1141                sdata->dev->name, ifmgd->bssid);
1142         if (ieee80211_privacy_mismatch(sdata)) {
1143                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1144                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1145                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1146                 return;
1147         }
1148
1149         ieee80211_send_assoc(sdata);
1150
1151         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1152 }
1153
1154 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1155                              struct ieee80211_hdr *hdr)
1156 {
1157         /*
1158          * We can postpone the mgd.timer whenever receiving unicast frames
1159          * from AP because we know that the connection is working both ways
1160          * at that time. But multicast frames (and hence also beacons) must
1161          * be ignored here, because we need to trigger the timer during
1162          * data idle periods for sending the periodical probe request to
1163          * the AP.
1164          */
1165         if (!is_multicast_ether_addr(hdr->addr1))
1166                 mod_timer(&sdata->u.mgd.timer,
1167                           jiffies + IEEE80211_MONITORING_INTERVAL);
1168 }
1169
1170 void ieee80211_beacon_loss_work(struct work_struct *work)
1171 {
1172         struct ieee80211_sub_if_data *sdata =
1173                 container_of(work, struct ieee80211_sub_if_data,
1174                              u.mgd.beacon_loss_work);
1175         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1176
1177 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1178         if (net_ratelimit()) {
1179                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1180                        "- sending probe request\n", sdata->dev->name,
1181                        sdata->u.mgd.bssid);
1182         }
1183 #endif
1184
1185         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1186         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1187                                  ifmgd->ssid_len, NULL, 0);
1188
1189         mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1190 }
1191
1192 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1193 {
1194         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1195
1196         queue_work(sdata->local->hw.workqueue,
1197                    &sdata->u.mgd.beacon_loss_work);
1198 }
1199 EXPORT_SYMBOL(ieee80211_beacon_loss);
1200
1201 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1202 {
1203         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1204         struct ieee80211_local *local = sdata->local;
1205         struct sta_info *sta;
1206         bool disassoc = false;
1207
1208         /* TODO: start monitoring current AP signal quality and number of
1209          * missed beacons. Scan other channels every now and then and search
1210          * for better APs. */
1211         /* TODO: remove expired BSSes */
1212
1213         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1214
1215         rcu_read_lock();
1216
1217         sta = sta_info_get(local, ifmgd->bssid);
1218         if (!sta) {
1219                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1220                        sdata->dev->name, ifmgd->bssid);
1221                 disassoc = true;
1222                 goto unlock;
1223         }
1224
1225         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1226             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1227                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1228                        "- disassociating\n",
1229                        sdata->dev->name, ifmgd->bssid);
1230                 disassoc = true;
1231                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1232                 goto unlock;
1233         }
1234
1235         /*
1236          * Beacon filtering is only enabled with power save and then the
1237          * stack should not check for beacon loss.
1238          */
1239         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1240               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1241             time_after(jiffies,
1242                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1243 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1244                 if (net_ratelimit()) {
1245                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1246                                "- sending probe request\n",
1247                                sdata->dev->name, ifmgd->bssid);
1248                 }
1249 #endif
1250                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1251                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1252                                          ifmgd->ssid_len, NULL, 0);
1253                 goto unlock;
1254
1255         }
1256
1257         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1258                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1259                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1260                                          ifmgd->ssid_len, NULL, 0);
1261         }
1262
1263  unlock:
1264         rcu_read_unlock();
1265
1266         if (disassoc)
1267                 ieee80211_set_disassoc(sdata, true, true,
1268                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1269         else
1270                 mod_timer(&ifmgd->timer, jiffies +
1271                                       IEEE80211_MONITORING_INTERVAL);
1272 }
1273
1274
1275 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1276 {
1277         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1278
1279         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1280         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1281         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1282                 /* Wait for SME to request association */
1283                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1284         } else
1285                 ieee80211_associate(sdata);
1286 }
1287
1288
1289 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1290                                      struct ieee80211_mgmt *mgmt,
1291                                      size_t len)
1292 {
1293         u8 *pos;
1294         struct ieee802_11_elems elems;
1295
1296         pos = mgmt->u.auth.variable;
1297         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1298         if (!elems.challenge)
1299                 return;
1300         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1301                             elems.challenge - 2, elems.challenge_len + 2,
1302                             sdata->u.mgd.bssid, 1);
1303         sdata->u.mgd.auth_transaction = 4;
1304 }
1305
1306 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1307                                    struct ieee80211_mgmt *mgmt,
1308                                    size_t len)
1309 {
1310         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1311         u16 auth_alg, auth_transaction, status_code;
1312
1313         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1314                 return;
1315
1316         if (len < 24 + 6)
1317                 return;
1318
1319         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1320                 return;
1321
1322         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1323                 return;
1324
1325         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1326         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1327         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1328
1329         if (auth_alg != ifmgd->auth_alg ||
1330             auth_transaction != ifmgd->auth_transaction)
1331                 return;
1332
1333         if (status_code != WLAN_STATUS_SUCCESS) {
1334                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1335                         u8 algs[3];
1336                         const int num_algs = ARRAY_SIZE(algs);
1337                         int i, pos;
1338                         algs[0] = algs[1] = algs[2] = 0xff;
1339                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1340                                 algs[0] = WLAN_AUTH_OPEN;
1341                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1342                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1343                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1344                                 algs[2] = WLAN_AUTH_LEAP;
1345                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1346                                 pos = 0;
1347                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1348                                 pos = 1;
1349                         else
1350                                 pos = 2;
1351                         for (i = 0; i < num_algs; i++) {
1352                                 pos++;
1353                                 if (pos >= num_algs)
1354                                         pos = 0;
1355                                 if (algs[pos] == ifmgd->auth_alg ||
1356                                     algs[pos] == 0xff)
1357                                         continue;
1358                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1359                                     !ieee80211_sta_wep_configured(sdata))
1360                                         continue;
1361                                 ifmgd->auth_alg = algs[pos];
1362                                 break;
1363                         }
1364                 }
1365                 return;
1366         }
1367
1368         switch (ifmgd->auth_alg) {
1369         case WLAN_AUTH_OPEN:
1370         case WLAN_AUTH_LEAP:
1371         case WLAN_AUTH_FT:
1372                 ieee80211_auth_completed(sdata);
1373                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1374                 break;
1375         case WLAN_AUTH_SHARED_KEY:
1376                 if (ifmgd->auth_transaction == 4) {
1377                         ieee80211_auth_completed(sdata);
1378                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1379                 } else
1380                         ieee80211_auth_challenge(sdata, mgmt, len);
1381                 break;
1382         }
1383 }
1384
1385
1386 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1387                                      struct ieee80211_mgmt *mgmt,
1388                                      size_t len)
1389 {
1390         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1391         u16 reason_code;
1392
1393         if (len < 24 + 2)
1394                 return;
1395
1396         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1397                 return;
1398
1399         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1400
1401         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1402                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1403                                 sdata->dev->name, reason_code);
1404
1405         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1406             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1407              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1408              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1409                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1410                 mod_timer(&ifmgd->timer, jiffies +
1411                                       IEEE80211_RETRY_AUTH_INTERVAL);
1412         }
1413
1414         ieee80211_set_disassoc(sdata, true, false, 0);
1415         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1416         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1417 }
1418
1419
1420 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1421                                        struct ieee80211_mgmt *mgmt,
1422                                        size_t len)
1423 {
1424         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1425         u16 reason_code;
1426
1427         if (len < 24 + 2)
1428                 return;
1429
1430         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1431                 return;
1432
1433         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1434
1435         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1436                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1437                                 sdata->dev->name, reason_code);
1438
1439         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1440             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1441                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1442                 mod_timer(&ifmgd->timer, jiffies +
1443                                       IEEE80211_RETRY_AUTH_INTERVAL);
1444         }
1445
1446         ieee80211_set_disassoc(sdata, false, false, reason_code);
1447         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1448 }
1449
1450
1451 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1452                                          struct ieee80211_mgmt *mgmt,
1453                                          size_t len,
1454                                          int reassoc)
1455 {
1456         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1457         struct ieee80211_local *local = sdata->local;
1458         struct ieee80211_supported_band *sband;
1459         struct sta_info *sta;
1460         u32 rates, basic_rates;
1461         u16 capab_info, status_code, aid;
1462         struct ieee802_11_elems elems;
1463         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1464         u8 *pos;
1465         u32 changed = 0;
1466         int i, j;
1467         bool have_higher_than_11mbit = false, newsta = false;
1468         u16 ap_ht_cap_flags;
1469
1470         /* AssocResp and ReassocResp have identical structure, so process both
1471          * of them in this function. */
1472
1473         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1474                 return;
1475
1476         if (len < 24 + 6)
1477                 return;
1478
1479         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1480                 return;
1481
1482         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1483         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1484         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1485
1486         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1487                "status=%d aid=%d)\n",
1488                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1489                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1490
1491         pos = mgmt->u.assoc_resp.variable;
1492         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1493
1494         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1495             elems.timeout_int && elems.timeout_int_len == 5 &&
1496             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1497                 u32 tu, ms;
1498                 tu = get_unaligned_le32(elems.timeout_int + 1);
1499                 ms = tu * 1024 / 1000;
1500                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1501                        "comeback duration %u TU (%u ms)\n",
1502                        sdata->dev->name, tu, ms);
1503                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1504                         mod_timer(&ifmgd->timer,
1505                                   jiffies + msecs_to_jiffies(ms));
1506                 return;
1507         }
1508
1509         if (status_code != WLAN_STATUS_SUCCESS) {
1510                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1511                        sdata->dev->name, status_code);
1512                 /* if this was a reassociation, ensure we try a "full"
1513                  * association next time. This works around some broken APs
1514                  * which do not correctly reject reassociation requests. */
1515                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1516                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1517                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1518                         /* Wait for SME to decide what to do next */
1519                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1520                 }
1521                 return;
1522         }
1523
1524         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1525                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1526                        "set\n", sdata->dev->name, aid);
1527         aid &= ~(BIT(15) | BIT(14));
1528
1529         if (!elems.supp_rates) {
1530                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1531                        sdata->dev->name);
1532                 return;
1533         }
1534
1535         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1536         ifmgd->aid = aid;
1537         ifmgd->ap_capab = capab_info;
1538
1539         kfree(ifmgd->assocresp_ies);
1540         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1541         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1542         if (ifmgd->assocresp_ies)
1543                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1544
1545         rcu_read_lock();
1546
1547         /* Add STA entry for the AP */
1548         sta = sta_info_get(local, ifmgd->bssid);
1549         if (!sta) {
1550                 newsta = true;
1551
1552                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1553                 if (!sta) {
1554                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1555                                " the AP\n", sdata->dev->name);
1556                         rcu_read_unlock();
1557                         return;
1558                 }
1559
1560                 /* update new sta with its last rx activity */
1561                 sta->last_rx = jiffies;
1562         }
1563
1564         /*
1565          * FIXME: Do we really need to update the sta_info's information here?
1566          *        We already know about the AP (we found it in our list) so it
1567          *        should already be filled with the right info, no?
1568          *        As is stands, all this is racy because typically we assume
1569          *        the information that is filled in here (except flags) doesn't
1570          *        change while a STA structure is alive. As such, it should move
1571          *        to between the sta_info_alloc() and sta_info_insert() above.
1572          */
1573
1574         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1575                            WLAN_STA_AUTHORIZED);
1576
1577         rates = 0;
1578         basic_rates = 0;
1579         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1580
1581         for (i = 0; i < elems.supp_rates_len; i++) {
1582                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1583                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1584
1585                 if (rate > 110)
1586                         have_higher_than_11mbit = true;
1587
1588                 for (j = 0; j < sband->n_bitrates; j++) {
1589                         if (sband->bitrates[j].bitrate == rate) {
1590                                 rates |= BIT(j);
1591                                 if (is_basic)
1592                                         basic_rates |= BIT(j);
1593                                 break;
1594                         }
1595                 }
1596         }
1597
1598         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1599                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1600                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1601
1602                 if (rate > 110)
1603                         have_higher_than_11mbit = true;
1604
1605                 for (j = 0; j < sband->n_bitrates; j++) {
1606                         if (sband->bitrates[j].bitrate == rate) {
1607                                 rates |= BIT(j);
1608                                 if (is_basic)
1609                                         basic_rates |= BIT(j);
1610                                 break;
1611                         }
1612                 }
1613         }
1614
1615         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1616         sdata->vif.bss_conf.basic_rates = basic_rates;
1617
1618         /* cf. IEEE 802.11 9.2.12 */
1619         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1620             have_higher_than_11mbit)
1621                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1622         else
1623                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1624
1625         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1626         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1627                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1628                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1629
1630         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1631
1632         rate_control_rate_init(sta);
1633
1634         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1635                 set_sta_flags(sta, WLAN_STA_MFP);
1636
1637         if (elems.wmm_param)
1638                 set_sta_flags(sta, WLAN_STA_WME);
1639
1640         if (newsta) {
1641                 int err = sta_info_insert(sta);
1642                 if (err) {
1643                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1644                                " the AP (error %d)\n", sdata->dev->name, err);
1645                         rcu_read_unlock();
1646                         return;
1647                 }
1648         }
1649
1650         rcu_read_unlock();
1651
1652         if (elems.wmm_param)
1653                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1654                                          elems.wmm_param_len);
1655
1656         if (elems.ht_info_elem && elems.wmm_param &&
1657             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1658             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1659                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1660                                                ap_ht_cap_flags);
1661
1662         /* set AID and assoc capability,
1663          * ieee80211_set_associated() will tell the driver */
1664         bss_conf->aid = aid;
1665         bss_conf->assoc_capability = capab_info;
1666         ieee80211_set_associated(sdata, changed);
1667
1668         /*
1669          * initialise the time of last beacon to be the association time,
1670          * otherwise beacon loss check will trigger immediately
1671          */
1672         ifmgd->last_beacon = jiffies;
1673
1674         ieee80211_associated(sdata);
1675         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1676 }
1677
1678
1679 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1680                                   struct ieee80211_mgmt *mgmt,
1681                                   size_t len,
1682                                   struct ieee80211_rx_status *rx_status,
1683                                   struct ieee802_11_elems *elems,
1684                                   bool beacon)
1685 {
1686         struct ieee80211_local *local = sdata->local;
1687         int freq;
1688         struct ieee80211_bss *bss;
1689         struct ieee80211_channel *channel;
1690
1691         if (elems->ds_params && elems->ds_params_len == 1)
1692                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1693         else
1694                 freq = rx_status->freq;
1695
1696         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1697
1698         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1699                 return;
1700
1701         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1702                                         channel, beacon);
1703         if (!bss)
1704                 return;
1705
1706         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1707             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1708                 struct ieee80211_channel_sw_ie *sw_elem =
1709                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1710                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1711         }
1712
1713         ieee80211_rx_bss_put(local, bss);
1714 }
1715
1716
1717 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1718                                          struct ieee80211_mgmt *mgmt,
1719                                          size_t len,
1720                                          struct ieee80211_rx_status *rx_status)
1721 {
1722         struct ieee80211_if_managed *ifmgd;
1723         size_t baselen;
1724         struct ieee802_11_elems elems;
1725
1726         ifmgd = &sdata->u.mgd;
1727
1728         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1729                 return; /* ignore ProbeResp to foreign address */
1730
1731         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1732         if (baselen > len)
1733                 return;
1734
1735         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1736                                 &elems);
1737
1738         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1739
1740         /* direct probe may be part of the association flow */
1741         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1742                                &ifmgd->request)) {
1743                 printk(KERN_DEBUG "%s direct probe responded\n",
1744                        sdata->dev->name);
1745                 ieee80211_authenticate(sdata);
1746         }
1747
1748         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1749                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1750 }
1751
1752 /*
1753  * This is the canonical list of information elements we care about,
1754  * the filter code also gives us all changes to the Microsoft OUI
1755  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1756  *
1757  * We implement beacon filtering in software since that means we can
1758  * avoid processing the frame here and in cfg80211, and userspace
1759  * will not be able to tell whether the hardware supports it or not.
1760  *
1761  * XXX: This list needs to be dynamic -- userspace needs to be able to
1762  *      add items it requires. It also needs to be able to tell us to
1763  *      look out for other vendor IEs.
1764  */
1765 static const u64 care_about_ies =
1766         (1ULL << WLAN_EID_COUNTRY) |
1767         (1ULL << WLAN_EID_ERP_INFO) |
1768         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1769         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1770         (1ULL << WLAN_EID_HT_CAPABILITY) |
1771         (1ULL << WLAN_EID_HT_INFORMATION);
1772
1773 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1774                                      struct ieee80211_mgmt *mgmt,
1775                                      size_t len,
1776                                      struct ieee80211_rx_status *rx_status)
1777 {
1778         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1779         size_t baselen;
1780         struct ieee802_11_elems elems;
1781         struct ieee80211_local *local = sdata->local;
1782         u32 changed = 0;
1783         bool erp_valid, directed_tim = false;
1784         u8 erp_value = 0;
1785         u32 ncrc;
1786
1787         /* Process beacon from the current BSS */
1788         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1789         if (baselen > len)
1790                 return;
1791
1792         if (rx_status->freq != local->hw.conf.channel->center_freq)
1793                 return;
1794
1795         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1796             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1797                 return;
1798
1799         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1800         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1801                                           len - baselen, &elems,
1802                                           care_about_ies, ncrc);
1803
1804         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1805                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1806                                                    ifmgd->aid);
1807
1808         ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));
1809
1810         if (ncrc == ifmgd->beacon_crc)
1811                 return;
1812         ifmgd->beacon_crc = ncrc;
1813
1814         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1815
1816         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1817                                  elems.wmm_param_len);
1818
1819         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1820                 if (directed_tim) {
1821                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1822                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1823                                 ieee80211_hw_config(local,
1824                                                     IEEE80211_CONF_CHANGE_PS);
1825                                 ieee80211_send_nullfunc(local, sdata, 0);
1826                         } else {
1827                                 local->pspolling = true;
1828
1829                                 /*
1830                                  * Here is assumed that the driver will be
1831                                  * able to send ps-poll frame and receive a
1832                                  * response even though power save mode is
1833                                  * enabled, but some drivers might require
1834                                  * to disable power save here. This needs
1835                                  * to be investigated.
1836                                  */
1837                                 ieee80211_send_pspoll(local, sdata);
1838                         }
1839                 }
1840         }
1841
1842         if (elems.erp_info && elems.erp_info_len >= 1) {
1843                 erp_valid = true;
1844                 erp_value = elems.erp_info[0];
1845         } else {
1846                 erp_valid = false;
1847         }
1848         changed |= ieee80211_handle_bss_capability(sdata,
1849                         le16_to_cpu(mgmt->u.beacon.capab_info),
1850                         erp_valid, erp_value);
1851
1852
1853         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1854             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1855                 struct sta_info *sta;
1856                 struct ieee80211_supported_band *sband;
1857                 u16 ap_ht_cap_flags;
1858
1859                 rcu_read_lock();
1860
1861                 sta = sta_info_get(local, ifmgd->bssid);
1862                 if (!sta) {
1863                         rcu_read_unlock();
1864                         return;
1865                 }
1866
1867                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1868
1869                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1870                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1871
1872                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1873
1874                 rcu_read_unlock();
1875
1876                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1877                                                ap_ht_cap_flags);
1878         }
1879
1880         if (elems.country_elem) {
1881                 /* Note we are only reviewing this on beacons
1882                  * for the BSSID we are associated to */
1883                 regulatory_hint_11d(local->hw.wiphy,
1884                         elems.country_elem, elems.country_elem_len);
1885
1886                 /* TODO: IBSS also needs this */
1887                 if (elems.pwr_constr_elem)
1888                         ieee80211_handle_pwr_constr(sdata,
1889                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1890                                 elems.pwr_constr_elem,
1891                                 elems.pwr_constr_elem_len);
1892         }
1893
1894         ieee80211_bss_info_change_notify(sdata, changed);
1895 }
1896
1897 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1898                                           struct sk_buff *skb,
1899                                           struct ieee80211_rx_status *rx_status)
1900 {
1901         struct ieee80211_local *local = sdata->local;
1902         struct ieee80211_mgmt *mgmt;
1903         u16 fc;
1904
1905         if (skb->len < 24)
1906                 return RX_DROP_MONITOR;
1907
1908         mgmt = (struct ieee80211_mgmt *) skb->data;
1909         fc = le16_to_cpu(mgmt->frame_control);
1910
1911         switch (fc & IEEE80211_FCTL_STYPE) {
1912         case IEEE80211_STYPE_PROBE_REQ:
1913         case IEEE80211_STYPE_PROBE_RESP:
1914         case IEEE80211_STYPE_BEACON:
1915                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1916         case IEEE80211_STYPE_AUTH:
1917         case IEEE80211_STYPE_ASSOC_RESP:
1918         case IEEE80211_STYPE_REASSOC_RESP:
1919         case IEEE80211_STYPE_DEAUTH:
1920         case IEEE80211_STYPE_DISASSOC:
1921                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1922                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1923                 return RX_QUEUED;
1924         }
1925
1926         return RX_DROP_MONITOR;
1927 }
1928
1929 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1930                                          struct sk_buff *skb)
1931 {
1932         struct ieee80211_rx_status *rx_status;
1933         struct ieee80211_mgmt *mgmt;
1934         u16 fc;
1935
1936         rx_status = (struct ieee80211_rx_status *) skb->cb;
1937         mgmt = (struct ieee80211_mgmt *) skb->data;
1938         fc = le16_to_cpu(mgmt->frame_control);
1939
1940         switch (fc & IEEE80211_FCTL_STYPE) {
1941         case IEEE80211_STYPE_PROBE_RESP:
1942                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1943                                              rx_status);
1944                 break;
1945         case IEEE80211_STYPE_BEACON:
1946                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1947                                          rx_status);
1948                 break;
1949         case IEEE80211_STYPE_AUTH:
1950                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1951                 break;
1952         case IEEE80211_STYPE_ASSOC_RESP:
1953                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1954                 break;
1955         case IEEE80211_STYPE_REASSOC_RESP:
1956                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1957                 break;
1958         case IEEE80211_STYPE_DEAUTH:
1959                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1960                 break;
1961         case IEEE80211_STYPE_DISASSOC:
1962                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1963                 break;
1964         }
1965
1966         kfree_skb(skb);
1967 }
1968
1969 static void ieee80211_sta_timer(unsigned long data)
1970 {
1971         struct ieee80211_sub_if_data *sdata =
1972                 (struct ieee80211_sub_if_data *) data;
1973         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1974         struct ieee80211_local *local = sdata->local;
1975
1976         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1977         queue_work(local->hw.workqueue, &ifmgd->work);
1978 }
1979
1980 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1981 {
1982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1983         struct ieee80211_local *local = sdata->local;
1984
1985         if (local->ops->reset_tsf) {
1986                 /* Reset own TSF to allow time synchronization work. */
1987                 local->ops->reset_tsf(local_to_hw(local));
1988         }
1989
1990         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1991
1992
1993         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1994                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1995         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1996                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1997         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1998                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1999         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2000                 ifmgd->auth_alg = WLAN_AUTH_FT;
2001         else
2002                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2003         ifmgd->auth_transaction = -1;
2004         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2005         ifmgd->assoc_scan_tries = 0;
2006         ifmgd->direct_probe_tries = 0;
2007         ifmgd->auth_tries = 0;
2008         ifmgd->assoc_tries = 0;
2009         netif_tx_stop_all_queues(sdata->dev);
2010         netif_carrier_off(sdata->dev);
2011 }
2012
2013 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2014 {
2015         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2016         struct ieee80211_local *local = sdata->local;
2017         struct ieee80211_bss *bss;
2018         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2019         u8 ssid_len = ifmgd->ssid_len;
2020         u16 capa_mask = WLAN_CAPABILITY_ESS;
2021         u16 capa_val = WLAN_CAPABILITY_ESS;
2022         struct ieee80211_channel *chan = local->oper_channel;
2023
2024         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2025             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2026                             IEEE80211_STA_AUTO_BSSID_SEL |
2027                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2028                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2029                 if (sdata->default_key)
2030                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2031         }
2032
2033         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2034                 chan = NULL;
2035
2036         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2037                 bssid = NULL;
2038
2039         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2040                 ssid = NULL;
2041                 ssid_len = 0;
2042         }
2043
2044         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2045                                        bssid, ssid, ssid_len,
2046                                        capa_mask, capa_val);
2047
2048         if (bss) {
2049                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2050                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2051                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2052                                                bss->ssid_len);
2053                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2054                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2055                                                     bss->supp_rates);
2056                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2057                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2058                 else
2059                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2060
2061                 /* Send out direct probe if no probe resp was received or
2062                  * the one we have is outdated
2063                  */
2064                 if (!bss->last_probe_resp ||
2065                     time_after(jiffies, bss->last_probe_resp
2066                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2067                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2068                 else
2069                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2070
2071                 ieee80211_rx_bss_put(local, bss);
2072                 ieee80211_sta_reset_auth(sdata);
2073                 return 0;
2074         } else {
2075                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2076                         u8 ssid_len = 0;
2077
2078                         if (!(ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL))
2079                                 ssid_len = ifmgd->ssid_len;
2080
2081                         ifmgd->assoc_scan_tries++;
2082
2083                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2084                                                         ssid_len);
2085
2086                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2087                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2088                 } else {
2089                         ifmgd->assoc_scan_tries = 0;
2090                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2091                 }
2092         }
2093         return -1;
2094 }
2095
2096
2097 static void ieee80211_sta_work(struct work_struct *work)
2098 {
2099         struct ieee80211_sub_if_data *sdata =
2100                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2101         struct ieee80211_local *local = sdata->local;
2102         struct ieee80211_if_managed *ifmgd;
2103         struct sk_buff *skb;
2104
2105         if (!netif_running(sdata->dev))
2106                 return;
2107
2108         if (local->sw_scanning || local->hw_scanning)
2109                 return;
2110
2111         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2112                 return;
2113         ifmgd = &sdata->u.mgd;
2114
2115         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2116                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2117
2118         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2119             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2120             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2121             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2122                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2123                                    round_jiffies_relative(0));
2124                 return;
2125         }
2126
2127         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2128                 if (ieee80211_sta_config_auth(sdata))
2129                         return;
2130                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2131         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2132                 return;
2133
2134         switch (ifmgd->state) {
2135         case IEEE80211_STA_MLME_DISABLED:
2136                 break;
2137         case IEEE80211_STA_MLME_DIRECT_PROBE:
2138                 ieee80211_direct_probe(sdata);
2139                 break;
2140         case IEEE80211_STA_MLME_AUTHENTICATE:
2141                 ieee80211_authenticate(sdata);
2142                 break;
2143         case IEEE80211_STA_MLME_ASSOCIATE:
2144                 ieee80211_associate(sdata);
2145                 break;
2146         case IEEE80211_STA_MLME_ASSOCIATED:
2147                 ieee80211_associated(sdata);
2148                 break;
2149         default:
2150                 WARN_ON(1);
2151                 break;
2152         }
2153
2154         if (ieee80211_privacy_mismatch(sdata)) {
2155                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2156                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2157
2158                 ieee80211_set_disassoc(sdata, false, true,
2159                                         WLAN_REASON_UNSPECIFIED);
2160         }
2161 }
2162
2163 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2164 {
2165         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2166                 /*
2167                  * Need to update last_beacon to avoid beacon loss
2168                  * test to trigger.
2169                  */
2170                 sdata->u.mgd.last_beacon = jiffies;
2171
2172
2173                 queue_work(sdata->local->hw.workqueue,
2174                            &sdata->u.mgd.work);
2175         }
2176 }
2177
2178 /* interface setup */
2179 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2180 {
2181         struct ieee80211_if_managed *ifmgd;
2182         u32 hw_flags;
2183
2184         ifmgd = &sdata->u.mgd;
2185         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2186         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2187         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2188         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2189                     (unsigned long) sdata);
2190         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2191                     (unsigned long) sdata);
2192         skb_queue_head_init(&ifmgd->skb_queue);
2193
2194         ifmgd->capab = WLAN_CAPABILITY_ESS;
2195         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2196                 IEEE80211_AUTH_ALG_SHARED_KEY;
2197         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2198                 IEEE80211_STA_AUTO_BSSID_SEL |
2199                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2200         if (sdata->local->hw.queues >= 4)
2201                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2202
2203         hw_flags = sdata->local->hw.flags;
2204
2205         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2206                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2207                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2208         }
2209 }
2210
2211 /* configuration hooks */
2212 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2213 {
2214         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2215         struct ieee80211_local *local = sdata->local;
2216
2217         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2218                 return;
2219
2220         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2221                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2222             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2223                              IEEE80211_STA_AUTO_SSID_SEL))) {
2224
2225                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2226                         ieee80211_set_disassoc(sdata, true, true,
2227                                                WLAN_REASON_DEAUTH_LEAVING);
2228
2229                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2230                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2231                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2232                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2233                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2234                 queue_work(local->hw.workqueue, &ifmgd->work);
2235         }
2236 }
2237
2238 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2239 {
2240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2241
2242         if (ifmgd->ssid_len)
2243                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2244         else
2245                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2246
2247         return 0;
2248 }
2249
2250 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2251 {
2252         struct ieee80211_if_managed *ifmgd;
2253
2254         if (len > IEEE80211_MAX_SSID_LEN)
2255                 return -EINVAL;
2256
2257         ifmgd = &sdata->u.mgd;
2258
2259         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2260                 /*
2261                  * Do not use reassociation if SSID is changed (different ESS).
2262                  */
2263                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2264                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2265                 memcpy(ifmgd->ssid, ssid, len);
2266                 ifmgd->ssid_len = len;
2267         }
2268
2269         return ieee80211_sta_commit(sdata);
2270 }
2271
2272 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2273 {
2274         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2275         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2276         *len = ifmgd->ssid_len;
2277         return 0;
2278 }
2279
2280 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2281 {
2282         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2283
2284         if (is_valid_ether_addr(bssid)) {
2285                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2286                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2287         } else {
2288                 memset(ifmgd->bssid, 0, ETH_ALEN);
2289                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2290         }
2291
2292         if (netif_running(sdata->dev))
2293                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2294
2295         return ieee80211_sta_commit(sdata);
2296 }
2297
2298 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2299                                const char *ie, size_t len)
2300 {
2301         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2302
2303         kfree(ifmgd->extra_ie);
2304         if (len == 0) {
2305                 ifmgd->extra_ie = NULL;
2306                 ifmgd->extra_ie_len = 0;
2307                 return 0;
2308         }
2309         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2310         if (!ifmgd->extra_ie) {
2311                 ifmgd->extra_ie_len = 0;
2312                 return -ENOMEM;
2313         }
2314         memcpy(ifmgd->extra_ie, ie, len);
2315         ifmgd->extra_ie_len = len;
2316         return 0;
2317 }
2318
2319 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2320 {
2321         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2322                sdata->dev->name, reason);
2323
2324         ieee80211_set_disassoc(sdata, true, true, reason);
2325         return 0;
2326 }
2327
2328 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2329 {
2330         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2331
2332         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2333                sdata->dev->name, reason);
2334
2335         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2336                 return -ENOLINK;
2337
2338         ieee80211_set_disassoc(sdata, false, true, reason);
2339         return 0;
2340 }
2341
2342 /* scan finished notification */
2343 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2344 {
2345         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2346
2347         /* Restart STA timers */
2348         rcu_read_lock();
2349         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2350                 ieee80211_restart_sta_timer(sdata);
2351         rcu_read_unlock();
2352 }
2353
2354 int ieee80211_max_network_latency(struct notifier_block *nb,
2355                                   unsigned long data, void *dummy)
2356 {
2357         s32 latency_usec = (s32) data;
2358         struct ieee80211_local *local =
2359                 container_of(nb, struct ieee80211_local,
2360                              network_latency_notifier);
2361
2362         mutex_lock(&local->iflist_mtx);
2363         ieee80211_recalc_ps(local, latency_usec);
2364         mutex_unlock(&local->iflist_mtx);
2365
2366         return 0;
2367 }