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/wireless.h>
  19 #include <linux/random.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/iw_handler.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  41
  42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  44
  45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  46
  47
  48 /* utils */
  49 static int ecw2cw(int ecw)
  50 {
  51         return (1 << ecw) - 1;
  52 }
  53
  54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  55 {
  56         u8 *end, *pos;
  57
  58         pos = bss->ies;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->ies_len;
  62
  63         while (pos + 1 < end) {
  64                 if (pos + 2 + pos[1] > end)
  65                         break;
  66                 if (pos[0] == ie)
  67                         return pos;
  68                 pos += 2 + pos[1];
  69         }
  70
  71         return NULL;
  72 }
  73
  74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u32 *rates)
  77 {
  78         int i, j, count;
  79         *rates = 0;
  80         count = 0;
  81         for (i = 0; i < bss->supp_rates_len; i++) {
  82                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  83
  84                 for (j = 0; j < sband->n_bitrates; j++)
  85                         if (sband->bitrates[j].bitrate == rate) {
  86                                 *rates |= BIT(j);
  87                                 count++;
  88                                 break;
  89                         }
  90         }
  91
  92         return count;
  93 }
  94
  95 /* also used by mesh code */
  96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
  97                             struct ieee802_11_elems *elems,
  98                             enum ieee80211_band band)
  99 {
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_rate *bitrates;
 102         size_t num_rates;
 103         u32 supp_rates;
 104         int i, j;
 105         sband = local->hw.wiphy->bands[band];
 106
 107         if (!sband) {
 108                 WARN_ON(1);
 109                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110         }
 111
 112         bitrates = sband->bitrates;
 113         num_rates = sband->n_bitrates;
 114         supp_rates = 0;
 115         for (i = 0; i < elems->supp_rates_len +
 116                      elems->ext_supp_rates_len; i++) {
 117                 u8 rate = 0;
 118                 int own_rate;
 119                 if (i < elems->supp_rates_len)
 120                         rate = elems->supp_rates[i];
 121                 else if (elems->ext_supp_rates)
 122                         rate = elems->ext_supp_rates
 123                                 [i - elems->supp_rates_len];
 124                 own_rate = 5 * (rate & 0x7f);
 125                 for (j = 0; j < num_rates; j++)
 126                         if (bitrates[j].bitrate == own_rate)
 127                                 supp_rates |= BIT(j);
 128         }
 129         return supp_rates;
 130 }
 131
 132 /* frame sending functions */
 133
 134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
 135 {
 136         if (ies)
 137                 memcpy(skb_put(skb, ies_len), ies, ies_len);
 138 }
 139
 140 /* also used by scanning code */
 141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 142                               u8 *ssid, size_t ssid_len)
 143 {
 144         struct ieee80211_local *local = sdata->local;
 145         struct ieee80211_supported_band *sband;
 146         struct sk_buff *skb;
 147         struct ieee80211_mgmt *mgmt;
 148         u8 *pos, *supp_rates, *esupp_rates = NULL;
 149         int i;
 150
 151         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 152                             sdata->u.sta.ie_probereq_len);
 153         if (!skb) {
 154                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 155                        "request\n", sdata->dev->name);
 156                 return;
 157         }
 158         skb_reserve(skb, local->hw.extra_tx_headroom);
 159
 160         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 161         memset(mgmt, 0, 24);
 162         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 163                                           IEEE80211_STYPE_PROBE_REQ);
 164         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 165         if (dst) {
 166                 memcpy(mgmt->da, dst, ETH_ALEN);
 167                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 168         } else {
 169                 memset(mgmt->da, 0xff, ETH_ALEN);
 170                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 171         }
 172         pos = skb_put(skb, 2 + ssid_len);
 173         *pos++ = WLAN_EID_SSID;
 174         *pos++ = ssid_len;
 175         memcpy(pos, ssid, ssid_len);
 176
 177         supp_rates = skb_put(skb, 2);
 178         supp_rates[0] = WLAN_EID_SUPP_RATES;
 179         supp_rates[1] = 0;
 180         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 181
 182         for (i = 0; i < sband->n_bitrates; i++) {
 183                 struct ieee80211_rate *rate = &sband->bitrates[i];
 184                 if (esupp_rates) {
 185                         pos = skb_put(skb, 1);
 186                         esupp_rates[1]++;
 187                 } else if (supp_rates[1] == 8) {
 188                         esupp_rates = skb_put(skb, 3);
 189                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 190                         esupp_rates[1] = 1;
 191                         pos = &esupp_rates[2];
 192                 } else {
 193                         pos = skb_put(skb, 1);
 194                         supp_rates[1]++;
 195                 }
 196                 *pos = rate->bitrate / 5;
 197         }
 198
 199         add_extra_ies(skb, sdata->u.sta.ie_probereq,
 200                       sdata->u.sta.ie_probereq_len);
 201
 202         ieee80211_tx_skb(sdata, skb, 0);
 203 }
 204
 205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 206                                 struct ieee80211_if_sta *ifsta,
 207                                 int transaction, u8 *extra, size_t extra_len,
 208                                 int encrypt)
 209 {
 210         struct ieee80211_local *local = sdata->local;
 211         struct sk_buff *skb;
 212         struct ieee80211_mgmt *mgmt;
 213
 214         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 215                             sizeof(*mgmt) + 6 + extra_len +
 216                             sdata->u.sta.ie_auth_len);
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 219                        "frame\n", sdata->dev->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 225         memset(mgmt, 0, 24 + 6);
 226         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 227                                           IEEE80211_STYPE_AUTH);
 228         if (encrypt)
 229                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 230         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 231         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 232         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 233         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 234         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 235         ifsta->auth_transaction = transaction + 1;
 236         mgmt->u.auth.status_code = cpu_to_le16(0);
 237         if (extra)
 238                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 239         add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
 240
 241         ieee80211_tx_skb(sdata, skb, encrypt);
 242 }
 243
 244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 245                                  struct ieee80211_if_sta *ifsta)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct sk_buff *skb;
 249         struct ieee80211_mgmt *mgmt;
 250         u8 *pos, *ies, *ht_ie, *e_ies;
 251         int i, len, count, rates_len, supp_rates_len;
 252         u16 capab;
 253         struct ieee80211_bss *bss;
 254         int wmm = 0;
 255         struct ieee80211_supported_band *sband;
 256         u32 rates = 0;
 257         size_t e_ies_len;
 258
 259         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 260                 e_ies = sdata->u.sta.ie_reassocreq;
 261                 e_ies_len = sdata->u.sta.ie_reassocreq_len;
 262         } else {
 263                 e_ies = sdata->u.sta.ie_assocreq;
 264                 e_ies_len = sdata->u.sta.ie_assocreq_len;
 265         }
 266
 267         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 268                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 269                             ifsta->ssid_len + e_ies_len);
 270         if (!skb) {
 271                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 272                        "frame\n", sdata->dev->name);
 273                 return;
 274         }
 275         skb_reserve(skb, local->hw.extra_tx_headroom);
 276
 277         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 278
 279         capab = ifsta->capab;
 280
 281         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 282                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 283                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 284                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 285                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 286         }
 287
 288         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 289                                    local->hw.conf.channel->center_freq,
 290                                    ifsta->ssid, ifsta->ssid_len);
 291         if (bss) {
 292                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 293                         capab |= WLAN_CAPABILITY_PRIVACY;
 294                 if (bss->wmm_used)
 295                         wmm = 1;
 296
 297                 /* get all rates supported by the device and the AP as
 298                  * some APs don't like getting a superset of their rates
 299                  * in the association request (e.g. D-Link DAP 1353 in
 300                  * b-only mode) */
 301                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 302
 303                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 304                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 305                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 306
 307                 ieee80211_rx_bss_put(local, bss);
 308         } else {
 309                 rates = ~0;
 310                 rates_len = sband->n_bitrates;
 311         }
 312
 313         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 314         memset(mgmt, 0, 24);
 315         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 316         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 317         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 318
 319         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 320                 skb_put(skb, 10);
 321                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 322                                                   IEEE80211_STYPE_REASSOC_REQ);
 323                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 324                 mgmt->u.reassoc_req.listen_interval =
 325                                 cpu_to_le16(local->hw.conf.listen_interval);
 326                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 327                        ETH_ALEN);
 328         } else {
 329                 skb_put(skb, 4);
 330                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 331                                                   IEEE80211_STYPE_ASSOC_REQ);
 332                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 333                 mgmt->u.assoc_req.listen_interval =
 334                                 cpu_to_le16(local->hw.conf.listen_interval);
 335         }
 336
 337         /* SSID */
 338         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 339         *pos++ = WLAN_EID_SSID;
 340         *pos++ = ifsta->ssid_len;
 341         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 342
 343         /* add all rates which were marked to be used above */
 344         supp_rates_len = rates_len;
 345         if (supp_rates_len > 8)
 346                 supp_rates_len = 8;
 347
 348         len = sband->n_bitrates;
 349         pos = skb_put(skb, supp_rates_len + 2);
 350         *pos++ = WLAN_EID_SUPP_RATES;
 351         *pos++ = supp_rates_len;
 352
 353         count = 0;
 354         for (i = 0; i < sband->n_bitrates; i++) {
 355                 if (BIT(i) & rates) {
 356                         int rate = sband->bitrates[i].bitrate;
 357                         *pos++ = (u8) (rate / 5);
 358                         if (++count == 8)
 359                                 break;
 360                 }
 361         }
 362
 363         if (rates_len > count) {
 364                 pos = skb_put(skb, rates_len - count + 2);
 365                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 366                 *pos++ = rates_len - count;
 367
 368                 for (i++; i < sband->n_bitrates; i++) {
 369                         if (BIT(i) & rates) {
 370                                 int rate = sband->bitrates[i].bitrate;
 371                                 *pos++ = (u8) (rate / 5);
 372                         }
 373                 }
 374         }
 375
 376         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 377                 /* 1. power capabilities */
 378                 pos = skb_put(skb, 4);
 379                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 380                 *pos++ = 2;
 381                 *pos++ = 0; /* min tx power */
 382                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 383
 384                 /* 2. supported channels */
 385                 /* TODO: get this in reg domain format */
 386                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 387                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 388                 *pos++ = 2 * sband->n_channels;
 389                 for (i = 0; i < sband->n_channels; i++) {
 390                         *pos++ = ieee80211_frequency_to_channel(
 391                                         sband->channels[i].center_freq);
 392                         *pos++ = 1; /* one channel in the subband*/
 393                 }
 394         }
 395
 396         if (ifsta->extra_ie) {
 397                 pos = skb_put(skb, ifsta->extra_ie_len);
 398                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 399         }
 400
 401         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 402                 pos = skb_put(skb, 9);
 403                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 404                 *pos++ = 7; /* len */
 405                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 406                 *pos++ = 0x50;
 407                 *pos++ = 0xf2;
 408                 *pos++ = 2; /* WME */
 409                 *pos++ = 0; /* WME info */
 410                 *pos++ = 1; /* WME ver */
 411                 *pos++ = 0;
 412         }
 413
 414         /* wmm support is a must to HT */
 415         /*
 416          * IEEE802.11n does not allow TKIP/WEP as pairwise
 417          * ciphers in HT mode. We still associate in non-ht
 418          * mode (11a/b/g) if any one of these ciphers is
 419          * configured as pairwise.
 420          */
 421         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 422             sband->ht_cap.ht_supported &&
 423             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 424             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 425             (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 426                 struct ieee80211_ht_info *ht_info =
 427                         (struct ieee80211_ht_info *)(ht_ie + 2);
 428                 u16 cap = sband->ht_cap.cap;
 429                 __le16 tmp;
 430                 u32 flags = local->hw.conf.channel->flags;
 431
 432                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 433                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 434                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 435                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 436                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 437                         }
 438                         break;
 439                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 440                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 441                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 442                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 443                         }
 444                         break;
 445                 }
 446
 447                 tmp = cpu_to_le16(cap);
 448                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 449                 *pos++ = WLAN_EID_HT_CAPABILITY;
 450                 *pos++ = sizeof(struct ieee80211_ht_cap);
 451                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 452                 memcpy(pos, &tmp, sizeof(u16));
 453                 pos += sizeof(u16);
 454                 /* TODO: needs a define here for << 2 */
 455                 *pos++ = sband->ht_cap.ampdu_factor |
 456                          (sband->ht_cap.ampdu_density << 2);
 457                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 458         }
 459
 460         add_extra_ies(skb, e_ies, e_ies_len);
 461
 462         kfree(ifsta->assocreq_ies);
 463         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 464         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 465         if (ifsta->assocreq_ies)
 466                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 467
 468         ieee80211_tx_skb(sdata, skb, 0);
 469 }
 470
 471
 472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 473                                            u16 stype, u16 reason)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 477         struct sk_buff *skb;
 478         struct ieee80211_mgmt *mgmt;
 479         u8 *ies;
 480         size_t ies_len;
 481
 482         if (stype == IEEE80211_STYPE_DEAUTH) {
 483                 ies = sdata->u.sta.ie_deauth;
 484                 ies_len = sdata->u.sta.ie_deauth_len;
 485         } else {
 486                 ies = sdata->u.sta.ie_disassoc;
 487                 ies_len = sdata->u.sta.ie_disassoc_len;
 488         }
 489
 490         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
 491                             ies_len);
 492         if (!skb) {
 493                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 494                        "deauth/disassoc frame\n", sdata->dev->name);
 495                 return;
 496         }
 497         skb_reserve(skb, local->hw.extra_tx_headroom);
 498
 499         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 500         memset(mgmt, 0, 24);
 501         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 502         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 503         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 504         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 505         skb_put(skb, 2);
 506         /* u.deauth.reason_code == u.disassoc.reason_code */
 507         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 508
 509         add_extra_ies(skb, ies, ies_len);
 510
 511         ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
 512 }
 513
 514 void ieee80211_send_pspoll(struct ieee80211_local *local,
 515                            struct ieee80211_sub_if_data *sdata)
 516 {
 517         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 518         struct ieee80211_pspoll *pspoll;
 519         struct sk_buff *skb;
 520         u16 fc;
 521
 522         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 523         if (!skb) {
 524                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 525                        "pspoll frame\n", sdata->dev->name);
 526                 return;
 527         }
 528         skb_reserve(skb, local->hw.extra_tx_headroom);
 529
 530         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 531         memset(pspoll, 0, sizeof(*pspoll));
 532         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 533         pspoll->frame_control = cpu_to_le16(fc);
 534         pspoll->aid = cpu_to_le16(ifsta->aid);
 535
 536         /* aid in PS-Poll has its two MSBs each set to 1 */
 537         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 538
 539         memcpy(pspoll->bssid, ifsta->bssid, ETH_ALEN);
 540         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 541
 542         ieee80211_tx_skb(sdata, skb, 0);
 543
 544         return;
 545 }
 546
 547 /* MLME */
 548 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 549                                          struct ieee80211_bss *bss)
 550 {
 551         struct ieee80211_local *local = sdata->local;
 552         int i, have_higher_than_11mbit = 0;
 553
 554         /* cf. IEEE 802.11 9.2.12 */
 555         for (i = 0; i < bss->supp_rates_len; i++)
 556                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 557                         have_higher_than_11mbit = 1;
 558
 559         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 560             have_higher_than_11mbit)
 561                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 562         else
 563                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 564
 565         ieee80211_set_wmm_default(sdata);
 566 }
 567
 568 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 569                                      struct ieee80211_if_sta *ifsta,
 570                                      u8 *wmm_param, size_t wmm_param_len)
 571 {
 572         struct ieee80211_tx_queue_params params;
 573         size_t left;
 574         int count;
 575         u8 *pos;
 576
 577         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 578                 return;
 579
 580         if (!wmm_param)
 581                 return;
 582
 583         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 584                 return;
 585         count = wmm_param[6] & 0x0f;
 586         if (count == ifsta->wmm_last_param_set)
 587                 return;
 588         ifsta->wmm_last_param_set = count;
 589
 590         pos = wmm_param + 8;
 591         left = wmm_param_len - 8;
 592
 593         memset(&params, 0, sizeof(params));
 594
 595         if (!local->ops->conf_tx)
 596                 return;
 597
 598         local->wmm_acm = 0;
 599         for (; left >= 4; left -= 4, pos += 4) {
 600                 int aci = (pos[0] >> 5) & 0x03;
 601                 int acm = (pos[0] >> 4) & 0x01;
 602                 int queue;
 603
 604                 switch (aci) {
 605                 case 1:
 606                         queue = 3;
 607                         if (acm)
 608                                 local->wmm_acm |= BIT(0) | BIT(3);
 609                         break;
 610                 case 2:
 611                         queue = 1;
 612                         if (acm)
 613                                 local->wmm_acm |= BIT(4) | BIT(5);
 614                         break;
 615                 case 3:
 616                         queue = 0;
 617                         if (acm)
 618                                 local->wmm_acm |= BIT(6) | BIT(7);
 619                         break;
 620                 case 0:
 621                 default:
 622                         queue = 2;
 623                         if (acm)
 624                                 local->wmm_acm |= BIT(1) | BIT(2);
 625                         break;
 626                 }
 627
 628                 params.aifs = pos[0] & 0x0f;
 629                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 630                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 631                 params.txop = get_unaligned_le16(pos + 2);
 632 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 633                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 634                        "cWmin=%d cWmax=%d txop=%d\n",
 635                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 636                        params.cw_max, params.txop);
 637 #endif
 638                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 639                  * AC for now) */
 640                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 641                         printk(KERN_DEBUG "%s: failed to set TX queue "
 642                                "parameters for queue %d\n", local->mdev->name, queue);
 643                 }
 644         }
 645 }
 646
 647 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 648 {
 649         u8 mask;
 650         u8 index, indexn1, indexn2;
 651         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 652
 653         aid &= 0x3fff;
 654         index = aid / 8;
 655         mask  = 1 << (aid & 7);
 656
 657         indexn1 = tim->bitmap_ctrl & 0xfe;
 658         indexn2 = elems->tim_len + indexn1 - 4;
 659
 660         if (index < indexn1 || index > indexn2)
 661                 return false;
 662
 663         index -= indexn1;
 664
 665         return !!(tim->virtual_map[index] & mask);
 666 }
 667
 668 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 669                                            u16 capab, bool erp_valid, u8 erp)
 670 {
 671         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 672 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 673         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 674 #endif
 675         u32 changed = 0;
 676         bool use_protection;
 677         bool use_short_preamble;
 678         bool use_short_slot;
 679
 680         if (erp_valid) {
 681                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 682                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 683         } else {
 684                 use_protection = false;
 685                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 686         }
 687
 688         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 689
 690         if (use_protection != bss_conf->use_cts_prot) {
 691 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 692                 if (net_ratelimit()) {
 693                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 694                                sdata->dev->name,
 695                                use_protection ? "enabled" : "disabled",
 696                                ifsta->bssid);
 697                 }
 698 #endif
 699                 bss_conf->use_cts_prot = use_protection;
 700                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 701         }
 702
 703         if (use_short_preamble != bss_conf->use_short_preamble) {
 704 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 705                 if (net_ratelimit()) {
 706                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 707                                " (BSSID=%pM)\n",
 708                                sdata->dev->name,
 709                                use_short_preamble ? "short" : "long",
 710                                ifsta->bssid);
 711                 }
 712 #endif
 713                 bss_conf->use_short_preamble = use_short_preamble;
 714                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 715         }
 716
 717         if (use_short_slot != bss_conf->use_short_slot) {
 718 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 719                 if (net_ratelimit()) {
 720                         printk(KERN_DEBUG "%s: switched to %s slot time"
 721                                " (BSSID=%pM)\n",
 722                                sdata->dev->name,
 723                                use_short_slot ? "short" : "long",
 724                                ifsta->bssid);
 725                 }
 726 #endif
 727                 bss_conf->use_short_slot = use_short_slot;
 728                 changed |= BSS_CHANGED_ERP_SLOT;
 729         }
 730
 731         return changed;
 732 }
 733
 734 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 735                                         struct ieee80211_if_sta *ifsta)
 736 {
 737         union iwreq_data wrqu;
 738         memset(&wrqu, 0, sizeof(wrqu));
 739         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 740                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 741         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 742         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 743 }
 744
 745 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 746                                          struct ieee80211_if_sta *ifsta)
 747 {
 748         char *buf;
 749         size_t len;
 750         int i;
 751         union iwreq_data wrqu;
 752
 753         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 754                 return;
 755
 756         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 757                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 758         if (!buf)
 759                 return;
 760
 761         len = sprintf(buf, "ASSOCINFO(");
 762         if (ifsta->assocreq_ies) {
 763                 len += sprintf(buf + len, "ReqIEs=");
 764                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 765                         len += sprintf(buf + len, "%02x",
 766                                        ifsta->assocreq_ies[i]);
 767                 }
 768         }
 769         if (ifsta->assocresp_ies) {
 770                 if (ifsta->assocreq_ies)
 771                         len += sprintf(buf + len, " ");
 772                 len += sprintf(buf + len, "RespIEs=");
 773                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 774                         len += sprintf(buf + len, "%02x",
 775                                        ifsta->assocresp_ies[i]);
 776                 }
 777         }
 778         len += sprintf(buf + len, ")");
 779
 780         if (len > IW_CUSTOM_MAX) {
 781                 len = sprintf(buf, "ASSOCRESPIE=");
 782                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 783                         len += sprintf(buf + len, "%02x",
 784                                        ifsta->assocresp_ies[i]);
 785                 }
 786         }
 787
 788         if (len <= IW_CUSTOM_MAX) {
 789                 memset(&wrqu, 0, sizeof(wrqu));
 790                 wrqu.data.length = len;
 791                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 792         }
 793
 794         kfree(buf);
 795 }
 796
 797
 798 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 799                                      struct ieee80211_if_sta *ifsta,
 800                                      u32 bss_info_changed)
 801 {
 802         struct ieee80211_local *local = sdata->local;
 803         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 804
 805         struct ieee80211_bss *bss;
 806
 807         bss_info_changed |= BSS_CHANGED_ASSOC;
 808         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 809
 810         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 811                 return;
 812
 813         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 814                                    conf->channel->center_freq,
 815                                    ifsta->ssid, ifsta->ssid_len);
 816         if (bss) {
 817                 /* set timing information */
 818                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
 819                 sdata->vif.bss_conf.timestamp = bss->timestamp;
 820                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 821
 822                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 823                         bss->capability, bss->has_erp_value, bss->erp_value);
 824
 825                 ieee80211_rx_bss_put(local, bss);
 826         }
 827
 828         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 829         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 830         ieee80211_sta_send_associnfo(sdata, ifsta);
 831
 832         ifsta->last_probe = jiffies;
 833         ieee80211_led_assoc(local, 1);
 834
 835         sdata->vif.bss_conf.assoc = 1;
 836         /*
 837          * For now just always ask the driver to update the basic rateset
 838          * when we have associated, we aren't checking whether it actually
 839          * changed or not.
 840          */
 841         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 842         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 843
 844         if (local->powersave) {
 845                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 846                     local->hw.conf.dynamic_ps_timeout > 0) {
 847                         mod_timer(&local->dynamic_ps_timer, jiffies +
 848                                   msecs_to_jiffies(
 849                                         local->hw.conf.dynamic_ps_timeout));
 850                 } else {
 851                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 852                                 ieee80211_send_nullfunc(local, sdata, 1);
 853                         conf->flags |= IEEE80211_CONF_PS;
 854                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 855                 }
 856         }
 857
 858         netif_tx_start_all_queues(sdata->dev);
 859         netif_carrier_on(sdata->dev);
 860
 861         ieee80211_sta_send_apinfo(sdata, ifsta);
 862 }
 863
 864 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 865                                    struct ieee80211_if_sta *ifsta)
 866 {
 867         ifsta->direct_probe_tries++;
 868         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 869                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 870                        sdata->dev->name, ifsta->bssid);
 871                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 872                 ieee80211_sta_send_apinfo(sdata, ifsta);
 873
 874                 /*
 875                  * Most likely AP is not in the range so remove the
 876                  * bss information associated to the AP
 877                  */
 878                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 879                                 sdata->local->hw.conf.channel->center_freq,
 880                                 ifsta->ssid, ifsta->ssid_len);
 881                 return;
 882         }
 883
 884         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 885                         sdata->dev->name, ifsta->bssid,
 886                         ifsta->direct_probe_tries);
 887
 888         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 889
 890         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 891
 892         /* Direct probe is sent to broadcast address as some APs
 893          * will not answer to direct packet in unassociated state.
 894          */
 895         ieee80211_send_probe_req(sdata, NULL,
 896                                  ifsta->ssid, ifsta->ssid_len);
 897
 898         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 899 }
 900
 901
 902 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 903                                    struct ieee80211_if_sta *ifsta)
 904 {
 905         ifsta->auth_tries++;
 906         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 907                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 908                        " timed out\n",
 909                        sdata->dev->name, ifsta->bssid);
 910                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 911                 ieee80211_sta_send_apinfo(sdata, ifsta);
 912                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 913                                 sdata->local->hw.conf.channel->center_freq,
 914                                 ifsta->ssid, ifsta->ssid_len);
 915                 return;
 916         }
 917
 918         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 919         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 920                sdata->dev->name, ifsta->bssid);
 921
 922         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 923
 924         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 925 }
 926
 927 /*
 928  * The disassoc 'reason' argument can be either our own reason
 929  * if self disconnected or a reason code from the AP.
 930  */
 931 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 932                                    struct ieee80211_if_sta *ifsta, bool deauth,
 933                                    bool self_disconnected, u16 reason)
 934 {
 935         struct ieee80211_local *local = sdata->local;
 936         struct sta_info *sta;
 937         u32 changed = 0, config_changed = 0;
 938
 939         rcu_read_lock();
 940
 941         sta = sta_info_get(local, ifsta->bssid);
 942         if (!sta) {
 943                 rcu_read_unlock();
 944                 return;
 945         }
 946
 947         if (deauth) {
 948                 ifsta->direct_probe_tries = 0;
 949                 ifsta->auth_tries = 0;
 950         }
 951         ifsta->assoc_scan_tries = 0;
 952         ifsta->assoc_tries = 0;
 953
 954         netif_tx_stop_all_queues(sdata->dev);
 955         netif_carrier_off(sdata->dev);
 956
 957         ieee80211_sta_tear_down_BA_sessions(sta);
 958
 959         if (self_disconnected) {
 960                 if (deauth)
 961                         ieee80211_send_deauth_disassoc(sdata,
 962                                 IEEE80211_STYPE_DEAUTH, reason);
 963                 else
 964                         ieee80211_send_deauth_disassoc(sdata,
 965                                 IEEE80211_STYPE_DISASSOC, reason);
 966         }
 967
 968         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 969         changed |= ieee80211_reset_erp_info(sdata);
 970
 971         ieee80211_led_assoc(local, 0);
 972         changed |= BSS_CHANGED_ASSOC;
 973         sdata->vif.bss_conf.assoc = false;
 974
 975         ieee80211_sta_send_apinfo(sdata, ifsta);
 976
 977         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 978                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 979                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 980                                 sdata->local->hw.conf.channel->center_freq,
 981                                 ifsta->ssid, ifsta->ssid_len);
 982         }
 983
 984         rcu_read_unlock();
 985
 986         /* channel(_type) changes are handled by ieee80211_hw_config */
 987         local->oper_channel_type = NL80211_CHAN_NO_HT;
 988
 989         local->power_constr_level = 0;
 990
 991         del_timer_sync(&local->dynamic_ps_timer);
 992         cancel_work_sync(&local->dynamic_ps_enable_work);
 993
 994         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 995                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 996                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 997         }
 998
 999         ieee80211_hw_config(local, config_changed);
1000         ieee80211_bss_info_change_notify(sdata, changed);
1001
1002         rcu_read_lock();
1003
1004         sta = sta_info_get(local, ifsta->bssid);
1005         if (!sta) {
1006                 rcu_read_unlock();
1007                 return;
1008         }
1009
1010         sta_info_unlink(&sta);
1011
1012         rcu_read_unlock();
1013
1014         sta_info_destroy(sta);
1015 }
1016
1017 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1018 {
1019         if (!sdata || !sdata->default_key ||
1020             sdata->default_key->conf.alg != ALG_WEP)
1021                 return 0;
1022         return 1;
1023 }
1024
1025 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
1026                                       struct ieee80211_if_sta *ifsta)
1027 {
1028         struct ieee80211_local *local = sdata->local;
1029         struct ieee80211_bss *bss;
1030         int bss_privacy;
1031         int wep_privacy;
1032         int privacy_invoked;
1033
1034         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1035                 return 0;
1036
1037         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1038                                    local->hw.conf.channel->center_freq,
1039                                    ifsta->ssid, ifsta->ssid_len);
1040         if (!bss)
1041                 return 0;
1042
1043         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1044         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1045         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1046
1047         ieee80211_rx_bss_put(local, bss);
1048
1049         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1050                 return 0;
1051
1052         return 1;
1053 }
1054
1055 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1056                                 struct ieee80211_if_sta *ifsta)
1057 {
1058         ifsta->assoc_tries++;
1059         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1060                 printk(KERN_DEBUG "%s: association with AP %pM"
1061                        " timed out\n",
1062                        sdata->dev->name, ifsta->bssid);
1063                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1064                 ieee80211_sta_send_apinfo(sdata, ifsta);
1065                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
1066                                 sdata->local->hw.conf.channel->center_freq,
1067                                 ifsta->ssid, ifsta->ssid_len);
1068                 return;
1069         }
1070
1071         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1072         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1073                sdata->dev->name, ifsta->bssid);
1074         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1075                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1076                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1077                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1078                 return;
1079         }
1080
1081         ieee80211_send_assoc(sdata, ifsta);
1082
1083         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1084 }
1085
1086
1087 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1088                                  struct ieee80211_if_sta *ifsta)
1089 {
1090         struct ieee80211_local *local = sdata->local;
1091         struct sta_info *sta;
1092         int disassoc;
1093
1094         /* TODO: start monitoring current AP signal quality and number of
1095          * missed beacons. Scan other channels every now and then and search
1096          * for better APs. */
1097         /* TODO: remove expired BSSes */
1098
1099         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1100
1101         rcu_read_lock();
1102
1103         sta = sta_info_get(local, ifsta->bssid);
1104         if (!sta) {
1105                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1106                        sdata->dev->name, ifsta->bssid);
1107                 disassoc = 1;
1108         } else {
1109                 disassoc = 0;
1110                 if (time_after(jiffies,
1111                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1112                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1113                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1114                                        "current AP %pM - assume out of "
1115                                        "range\n",
1116                                        sdata->dev->name, ifsta->bssid);
1117                                 disassoc = 1;
1118                         } else
1119                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1120                                                          ifsta->ssid,
1121                                                          ifsta->ssid_len);
1122                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1123                 } else {
1124                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1125                         if (time_after(jiffies, ifsta->last_probe +
1126                                        IEEE80211_PROBE_INTERVAL)) {
1127                                 ifsta->last_probe = jiffies;
1128                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1129                                                          ifsta->ssid,
1130                                                          ifsta->ssid_len);
1131                         }
1132                 }
1133         }
1134
1135         rcu_read_unlock();
1136
1137         if (disassoc)
1138                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1139                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1140         else
1141                 mod_timer(&ifsta->timer, jiffies +
1142                                       IEEE80211_MONITORING_INTERVAL);
1143 }
1144
1145
1146 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1147                                      struct ieee80211_if_sta *ifsta)
1148 {
1149         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1150         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1151         ieee80211_associate(sdata, ifsta);
1152 }
1153
1154
1155 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1156                                      struct ieee80211_if_sta *ifsta,
1157                                      struct ieee80211_mgmt *mgmt,
1158                                      size_t len)
1159 {
1160         u8 *pos;
1161         struct ieee802_11_elems elems;
1162
1163         pos = mgmt->u.auth.variable;
1164         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1165         if (!elems.challenge)
1166                 return;
1167         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1168                             elems.challenge_len + 2, 1);
1169 }
1170
1171 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1172                                    struct ieee80211_if_sta *ifsta,
1173                                    struct ieee80211_mgmt *mgmt,
1174                                    size_t len)
1175 {
1176         u16 auth_alg, auth_transaction, status_code;
1177
1178         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1179             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1180                 return;
1181
1182         if (len < 24 + 6)
1183                 return;
1184
1185         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1186             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1187                 return;
1188
1189         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1190             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1191                 return;
1192
1193         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1194         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1195         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1196
1197         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1198                 /*
1199                  * IEEE 802.11 standard does not require authentication in IBSS
1200                  * networks and most implementations do not seem to use it.
1201                  * However, try to reply to authentication attempts if someone
1202                  * has actually implemented this.
1203                  */
1204                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1205                         return;
1206                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1207         }
1208
1209         if (auth_alg != ifsta->auth_alg ||
1210             auth_transaction != ifsta->auth_transaction)
1211                 return;
1212
1213         if (status_code != WLAN_STATUS_SUCCESS) {
1214                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1215                         u8 algs[3];
1216                         const int num_algs = ARRAY_SIZE(algs);
1217                         int i, pos;
1218                         algs[0] = algs[1] = algs[2] = 0xff;
1219                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1220                                 algs[0] = WLAN_AUTH_OPEN;
1221                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1222                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1223                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1224                                 algs[2] = WLAN_AUTH_LEAP;
1225                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1226                                 pos = 0;
1227                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1228                                 pos = 1;
1229                         else
1230                                 pos = 2;
1231                         for (i = 0; i < num_algs; i++) {
1232                                 pos++;
1233                                 if (pos >= num_algs)
1234                                         pos = 0;
1235                                 if (algs[pos] == ifsta->auth_alg ||
1236                                     algs[pos] == 0xff)
1237                                         continue;
1238                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1239                                     !ieee80211_sta_wep_configured(sdata))
1240                                         continue;
1241                                 ifsta->auth_alg = algs[pos];
1242                                 break;
1243                         }
1244                 }
1245                 return;
1246         }
1247
1248         switch (ifsta->auth_alg) {
1249         case WLAN_AUTH_OPEN:
1250         case WLAN_AUTH_LEAP:
1251                 ieee80211_auth_completed(sdata, ifsta);
1252                 break;
1253         case WLAN_AUTH_SHARED_KEY:
1254                 if (ifsta->auth_transaction == 4)
1255                         ieee80211_auth_completed(sdata, ifsta);
1256                 else
1257                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1258                 break;
1259         }
1260 }
1261
1262
1263 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1264                                      struct ieee80211_if_sta *ifsta,
1265                                      struct ieee80211_mgmt *mgmt,
1266                                      size_t len)
1267 {
1268         u16 reason_code;
1269
1270         if (len < 24 + 2)
1271                 return;
1272
1273         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1274                 return;
1275
1276         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1277
1278         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1279                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1280                                 sdata->dev->name, reason_code);
1281
1282         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1283             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1284             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1285                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1286                 mod_timer(&ifsta->timer, jiffies +
1287                                       IEEE80211_RETRY_AUTH_INTERVAL);
1288         }
1289
1290         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1291         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1292 }
1293
1294
1295 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1296                                        struct ieee80211_if_sta *ifsta,
1297                                        struct ieee80211_mgmt *mgmt,
1298                                        size_t len)
1299 {
1300         u16 reason_code;
1301
1302         if (len < 24 + 2)
1303                 return;
1304
1305         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1306                 return;
1307
1308         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1309
1310         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1311                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1312                                 sdata->dev->name, reason_code);
1313
1314         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1315                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1316                 mod_timer(&ifsta->timer, jiffies +
1317                                       IEEE80211_RETRY_AUTH_INTERVAL);
1318         }
1319
1320         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1321 }
1322
1323
1324 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1325                                          struct ieee80211_if_sta *ifsta,
1326                                          struct ieee80211_mgmt *mgmt,
1327                                          size_t len,
1328                                          int reassoc)
1329 {
1330         struct ieee80211_local *local = sdata->local;
1331         struct ieee80211_supported_band *sband;
1332         struct sta_info *sta;
1333         u32 rates, basic_rates;
1334         u16 capab_info, status_code, aid;
1335         struct ieee802_11_elems elems;
1336         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1337         u8 *pos;
1338         u32 changed = 0;
1339         int i, j;
1340         bool have_higher_than_11mbit = false, newsta = false;
1341         u16 ap_ht_cap_flags;
1342
1343         /* AssocResp and ReassocResp have identical structure, so process both
1344          * of them in this function. */
1345
1346         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1347                 return;
1348
1349         if (len < 24 + 6)
1350                 return;
1351
1352         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1353                 return;
1354
1355         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1356         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1357         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1358
1359         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1360                "status=%d aid=%d)\n",
1361                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1362                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1363
1364         pos = mgmt->u.assoc_resp.variable;
1365         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1366
1367         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1368             elems.timeout_int && elems.timeout_int_len == 5 &&
1369             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1370                 u32 tu, ms;
1371                 tu = get_unaligned_le32(elems.timeout_int + 1);
1372                 ms = tu * 1024 / 1000;
1373                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1374                        "comeback duration %u TU (%u ms)\n",
1375                        sdata->dev->name, tu, ms);
1376                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1377                         mod_timer(&ifsta->timer,
1378                                   jiffies + msecs_to_jiffies(ms));
1379                 return;
1380         }
1381
1382         if (status_code != WLAN_STATUS_SUCCESS) {
1383                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1384                        sdata->dev->name, status_code);
1385                 /* if this was a reassociation, ensure we try a "full"
1386                  * association next time. This works around some broken APs
1387                  * which do not correctly reject reassociation requests. */
1388                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1389                 return;
1390         }
1391
1392         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1393                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1394                        "set\n", sdata->dev->name, aid);
1395         aid &= ~(BIT(15) | BIT(14));
1396
1397         if (!elems.supp_rates) {
1398                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1399                        sdata->dev->name);
1400                 return;
1401         }
1402
1403         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1404         ifsta->aid = aid;
1405         ifsta->ap_capab = capab_info;
1406
1407         kfree(ifsta->assocresp_ies);
1408         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1409         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1410         if (ifsta->assocresp_ies)
1411                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1412
1413         rcu_read_lock();
1414
1415         /* Add STA entry for the AP */
1416         sta = sta_info_get(local, ifsta->bssid);
1417         if (!sta) {
1418                 struct ieee80211_bss *bss;
1419
1420                 newsta = true;
1421
1422                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1423                 if (!sta) {
1424                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1425                                " the AP\n", sdata->dev->name);
1426                         rcu_read_unlock();
1427                         return;
1428                 }
1429                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1430                                            local->hw.conf.channel->center_freq,
1431                                            ifsta->ssid, ifsta->ssid_len);
1432                 if (bss) {
1433                         sta->last_signal = bss->signal;
1434                         sta->last_qual = bss->qual;
1435                         sta->last_noise = bss->noise;
1436                         ieee80211_rx_bss_put(local, bss);
1437                 }
1438
1439                 /* update new sta with its last rx activity */
1440                 sta->last_rx = jiffies;
1441         }
1442
1443         /*
1444          * FIXME: Do we really need to update the sta_info's information here?
1445          *        We already know about the AP (we found it in our list) so it
1446          *        should already be filled with the right info, no?
1447          *        As is stands, all this is racy because typically we assume
1448          *        the information that is filled in here (except flags) doesn't
1449          *        change while a STA structure is alive. As such, it should move
1450          *        to between the sta_info_alloc() and sta_info_insert() above.
1451          */
1452
1453         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1454                            WLAN_STA_AUTHORIZED);
1455
1456         rates = 0;
1457         basic_rates = 0;
1458         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1459
1460         for (i = 0; i < elems.supp_rates_len; i++) {
1461                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1462                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1463
1464                 if (rate > 110)
1465                         have_higher_than_11mbit = true;
1466
1467                 for (j = 0; j < sband->n_bitrates; j++) {
1468                         if (sband->bitrates[j].bitrate == rate) {
1469                                 rates |= BIT(j);
1470                                 if (is_basic)
1471                                         basic_rates |= BIT(j);
1472                                 break;
1473                         }
1474                 }
1475         }
1476
1477         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1478                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1479                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1480
1481                 if (rate > 110)
1482                         have_higher_than_11mbit = true;
1483
1484                 for (j = 0; j < sband->n_bitrates; j++) {
1485                         if (sband->bitrates[j].bitrate == rate) {
1486                                 rates |= BIT(j);
1487                                 if (is_basic)
1488                                         basic_rates |= BIT(j);
1489                                 break;
1490                         }
1491                 }
1492         }
1493
1494         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1495         sdata->vif.bss_conf.basic_rates = basic_rates;
1496
1497         /* cf. IEEE 802.11 9.2.12 */
1498         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1499             have_higher_than_11mbit)
1500                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1501         else
1502                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1503
1504         if (elems.ht_cap_elem)
1505                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1506                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1507
1508         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1509
1510         rate_control_rate_init(sta);
1511
1512         if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1513                 set_sta_flags(sta, WLAN_STA_MFP);
1514
1515         if (elems.wmm_param)
1516                 set_sta_flags(sta, WLAN_STA_WME);
1517
1518         if (newsta) {
1519                 int err = sta_info_insert(sta);
1520                 if (err) {
1521                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1522                                " the AP (error %d)\n", sdata->dev->name, err);
1523                         rcu_read_unlock();
1524                         return;
1525                 }
1526         }
1527
1528         rcu_read_unlock();
1529
1530         if (elems.wmm_param)
1531                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1532                                          elems.wmm_param_len);
1533
1534         if (elems.ht_info_elem && elems.wmm_param &&
1535             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1536                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1537                                                ap_ht_cap_flags);
1538
1539         /* set AID and assoc capability,
1540          * ieee80211_set_associated() will tell the driver */
1541         bss_conf->aid = aid;
1542         bss_conf->assoc_capability = capab_info;
1543         ieee80211_set_associated(sdata, ifsta, changed);
1544
1545         ieee80211_associated(sdata, ifsta);
1546 }
1547
1548
1549 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1550                                    struct ieee80211_if_sta *ifsta,
1551                                    struct ieee80211_bss *bss)
1552 {
1553         struct ieee80211_local *local = sdata->local;
1554         int res = 0, rates, i, j;
1555         struct sk_buff *skb;
1556         struct ieee80211_mgmt *mgmt;
1557         u8 *pos;
1558         struct ieee80211_supported_band *sband;
1559         union iwreq_data wrqu;
1560
1561         if (local->ops->reset_tsf) {
1562                 /* Reset own TSF to allow time synchronization work. */
1563                 local->ops->reset_tsf(local_to_hw(local));
1564         }
1565
1566         if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1567            memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) == 0)
1568                 return res;
1569
1570         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1571                             sdata->u.sta.ie_proberesp_len);
1572         if (!skb) {
1573                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1574                        "response\n", sdata->dev->name);
1575                 return -ENOMEM;
1576         }
1577
1578         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1579
1580         if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1581                 /* Remove possible STA entries from other IBSS networks. */
1582                 sta_info_flush_delayed(sdata);
1583         }
1584
1585         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1586         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1587         if (res)
1588                 return res;
1589
1590         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1591
1592         sdata->drop_unencrypted = bss->capability &
1593                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1594
1595         res = ieee80211_set_freq(sdata, bss->freq);
1596
1597         if (res)
1598                 return res;
1599
1600         /* Build IBSS probe response */
1601
1602         skb_reserve(skb, local->hw.extra_tx_headroom);
1603
1604         mgmt = (struct ieee80211_mgmt *)
1605                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1606         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1607         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1608                                                 IEEE80211_STYPE_PROBE_RESP);
1609         memset(mgmt->da, 0xff, ETH_ALEN);
1610         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1611         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1612         mgmt->u.beacon.beacon_int =
1613                 cpu_to_le16(local->hw.conf.beacon_int);
1614         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1615         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1616
1617         pos = skb_put(skb, 2 + ifsta->ssid_len);
1618         *pos++ = WLAN_EID_SSID;
1619         *pos++ = ifsta->ssid_len;
1620         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1621
1622         rates = bss->supp_rates_len;
1623         if (rates > 8)
1624                 rates = 8;
1625         pos = skb_put(skb, 2 + rates);
1626         *pos++ = WLAN_EID_SUPP_RATES;
1627         *pos++ = rates;
1628         memcpy(pos, bss->supp_rates, rates);
1629
1630         if (bss->band == IEEE80211_BAND_2GHZ) {
1631                 pos = skb_put(skb, 2 + 1);
1632                 *pos++ = WLAN_EID_DS_PARAMS;
1633                 *pos++ = 1;
1634                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1635         }
1636
1637         pos = skb_put(skb, 2 + 2);
1638         *pos++ = WLAN_EID_IBSS_PARAMS;
1639         *pos++ = 2;
1640         /* FIX: set ATIM window based on scan results */
1641         *pos++ = 0;
1642         *pos++ = 0;
1643
1644         if (bss->supp_rates_len > 8) {
1645                 rates = bss->supp_rates_len - 8;
1646                 pos = skb_put(skb, 2 + rates);
1647                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1648                 *pos++ = rates;
1649                 memcpy(pos, &bss->supp_rates[8], rates);
1650         }
1651
1652         add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1653                       sdata->u.sta.ie_proberesp_len);
1654
1655         ifsta->probe_resp = skb;
1656
1657         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1658                                    IEEE80211_IFCC_BEACON_ENABLED);
1659
1660
1661         rates = 0;
1662         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1663         for (i = 0; i < bss->supp_rates_len; i++) {
1664                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1665                 for (j = 0; j < sband->n_bitrates; j++)
1666                         if (sband->bitrates[j].bitrate == bitrate)
1667                                 rates |= BIT(j);
1668         }
1669         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1670
1671         ieee80211_sta_def_wmm_params(sdata, bss);
1672
1673         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1674         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1675         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1676
1677         ieee80211_led_assoc(local, true);
1678
1679         memset(&wrqu, 0, sizeof(wrqu));
1680         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1681         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1682
1683         return res;
1684 }
1685
1686 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1687                                   struct ieee80211_mgmt *mgmt,
1688                                   size_t len,
1689                                   struct ieee80211_rx_status *rx_status,
1690                                   struct ieee802_11_elems *elems,
1691                                   bool beacon)
1692 {
1693         struct ieee80211_local *local = sdata->local;
1694         int freq;
1695         struct ieee80211_bss *bss;
1696         struct sta_info *sta;
1697         struct ieee80211_channel *channel;
1698         u64 beacon_timestamp, rx_timestamp;
1699         u32 supp_rates = 0;
1700         enum ieee80211_band band = rx_status->band;
1701
1702         if (elems->ds_params && elems->ds_params_len == 1)
1703                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1704         else
1705                 freq = rx_status->freq;
1706
1707         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1708
1709         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1710                 return;
1711
1712         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1713             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1714                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1715
1716                 rcu_read_lock();
1717
1718                 sta = sta_info_get(local, mgmt->sa);
1719                 if (sta) {
1720                         u32 prev_rates;
1721
1722                         prev_rates = sta->sta.supp_rates[band];
1723                         /* make sure mandatory rates are always added */
1724                         sta->sta.supp_rates[band] = supp_rates |
1725                                 ieee80211_mandatory_rates(local, band);
1726
1727 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1728                         if (sta->sta.supp_rates[band] != prev_rates)
1729                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1730                                     "for %pM based on beacon info (0x%llx | "
1731                                     "0x%llx -> 0x%llx)\n",
1732                                     sdata->dev->name,
1733                                     sta->sta.addr,
1734                                     (unsigned long long) prev_rates,
1735                                     (unsigned long long) supp_rates,
1736                                     (unsigned long long) sta->sta.supp_rates[band]);
1737 #endif
1738                 } else {
1739                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1740                 }
1741
1742                 rcu_read_unlock();
1743         }
1744
1745         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1746                                         freq, beacon);
1747         if (!bss)
1748                 return;
1749
1750         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1751             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1752                 struct ieee80211_channel_sw_ie *sw_elem =
1753                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1754                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1755         }
1756
1757         /* was just updated in ieee80211_bss_info_update */
1758         beacon_timestamp = bss->timestamp;
1759
1760         /*
1761          * In STA mode, the remaining parameters should not be overridden
1762          * by beacons because they're not necessarily accurate there.
1763          */
1764         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1765             bss->last_probe_resp && beacon) {
1766                 ieee80211_rx_bss_put(local, bss);
1767                 return;
1768         }
1769
1770         /* check if we need to merge IBSS */
1771         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1772             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1773             bss->capability & WLAN_CAPABILITY_IBSS &&
1774             bss->freq == local->oper_channel->center_freq &&
1775             elems->ssid_len == sdata->u.sta.ssid_len &&
1776             memcmp(elems->ssid, sdata->u.sta.ssid,
1777                                 sdata->u.sta.ssid_len) == 0) {
1778                 if (rx_status->flag & RX_FLAG_TSFT) {
1779                         /* in order for correct IBSS merging we need mactime
1780                          *
1781                          * since mactime is defined as the time the first data
1782                          * symbol of the frame hits the PHY, and the timestamp
1783                          * of the beacon is defined as "the time that the data
1784                          * symbol containing the first bit of the timestamp is
1785                          * transmitted to the PHY plus the transmitting STA’s
1786                          * delays through its local PHY from the MAC-PHY
1787                          * interface to its interface with the WM"
1788                          * (802.11 11.1.2) - equals the time this bit arrives at
1789                          * the receiver - we have to take into account the
1790                          * offset between the two.
1791                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1792                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1793                          */
1794                         int rate;
1795                         if (rx_status->flag & RX_FLAG_HT) {
1796                                 rate = 65; /* TODO: HT rates */
1797                         } else {
1798                                 rate = local->hw.wiphy->bands[band]->
1799                                         bitrates[rx_status->rate_idx].bitrate;
1800                         }
1801                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1802                 } else if (local && local->ops && local->ops->get_tsf)
1803                         /* second best option: get current TSF */
1804                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1805                 else
1806                         /* can't merge without knowing the TSF */
1807                         rx_timestamp = -1LLU;
1808 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1809                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1810                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1811                        mgmt->sa, mgmt->bssid,
1812                        (unsigned long long)rx_timestamp,
1813                        (unsigned long long)beacon_timestamp,
1814                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1815                        jiffies);
1816 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1817                 if (beacon_timestamp > rx_timestamp) {
1818 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1819                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1820                                "local TSF - IBSS merge with BSSID %pM\n",
1821                                sdata->dev->name, mgmt->bssid);
1822 #endif
1823                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1824                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1825                 }
1826         }
1827
1828         ieee80211_rx_bss_put(local, bss);
1829 }
1830
1831
1832 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1833                                          struct ieee80211_mgmt *mgmt,
1834                                          size_t len,
1835                                          struct ieee80211_rx_status *rx_status)
1836 {
1837         size_t baselen;
1838         struct ieee802_11_elems elems;
1839         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1840
1841         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1842                 return; /* ignore ProbeResp to foreign address */
1843
1844         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1845         if (baselen > len)
1846                 return;
1847
1848         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1849                                 &elems);
1850
1851         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1852
1853         /* direct probe may be part of the association flow */
1854         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1855                                                         &ifsta->request)) {
1856                 printk(KERN_DEBUG "%s direct probe responded\n",
1857                        sdata->dev->name);
1858                 ieee80211_authenticate(sdata, ifsta);
1859         }
1860 }
1861
1862
1863 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1864                                      struct ieee80211_mgmt *mgmt,
1865                                      size_t len,
1866                                      struct ieee80211_rx_status *rx_status)
1867 {
1868         struct ieee80211_if_sta *ifsta;
1869         size_t baselen;
1870         struct ieee802_11_elems elems;
1871         struct ieee80211_local *local = sdata->local;
1872         u32 changed = 0;
1873         bool erp_valid, directed_tim;
1874         u8 erp_value = 0;
1875
1876         /* Process beacon from the current BSS */
1877         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1878         if (baselen > len)
1879                 return;
1880
1881         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1882
1883         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1884
1885         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1886                 return;
1887         ifsta = &sdata->u.sta;
1888
1889         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1890             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1891                 return;
1892
1893         if (rx_status->freq != local->hw.conf.channel->center_freq)
1894                 return;
1895
1896         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1897                                  elems.wmm_param_len);
1898
1899         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1900             local->hw.conf.flags & IEEE80211_CONF_PS) {
1901                 directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
1902
1903                 if (directed_tim) {
1904                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1905                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1906                                 ieee80211_hw_config(local,
1907                                                     IEEE80211_CONF_CHANGE_PS);
1908                                 ieee80211_send_nullfunc(local, sdata, 0);
1909                         } else {
1910                                 local->pspolling = true;
1911
1912                                 /*
1913                                  * Here is assumed that the driver will be
1914                                  * able to send ps-poll frame and receive a
1915                                  * response even though power save mode is
1916                                  * enabled, but some drivers might require
1917                                  * to disable power save here. This needs
1918                                  * to be investigated.
1919                                  */
1920                                 ieee80211_send_pspoll(local, sdata);
1921                         }
1922                 }
1923         }
1924
1925         if (elems.erp_info && elems.erp_info_len >= 1) {
1926                 erp_valid = true;
1927                 erp_value = elems.erp_info[0];
1928         } else {
1929                 erp_valid = false;
1930         }
1931         changed |= ieee80211_handle_bss_capability(sdata,
1932                         le16_to_cpu(mgmt->u.beacon.capab_info),
1933                         erp_valid, erp_value);
1934
1935
1936         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1937                 struct sta_info *sta;
1938                 struct ieee80211_supported_band *sband;
1939                 u16 ap_ht_cap_flags;
1940
1941                 rcu_read_lock();
1942
1943                 sta = sta_info_get(local, ifsta->bssid);
1944                 if (!sta) {
1945                         rcu_read_unlock();
1946                         return;
1947                 }
1948
1949                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1950
1951                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1952                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1953
1954                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1955
1956                 rcu_read_unlock();
1957
1958                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1959                                                ap_ht_cap_flags);
1960         }
1961
1962         if (elems.country_elem) {
1963                 /* Note we are only reviewing this on beacons
1964                  * for the BSSID we are associated to */
1965                 regulatory_hint_11d(local->hw.wiphy,
1966                         elems.country_elem, elems.country_elem_len);
1967
1968                 /* TODO: IBSS also needs this */
1969                 if (elems.pwr_constr_elem)
1970                         ieee80211_handle_pwr_constr(sdata,
1971                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1972                                 elems.pwr_constr_elem,
1973                                 elems.pwr_constr_elem_len);
1974         }
1975
1976         ieee80211_bss_info_change_notify(sdata, changed);
1977 }
1978
1979
1980 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1981                                         struct ieee80211_if_sta *ifsta,
1982                                         struct ieee80211_mgmt *mgmt,
1983                                         size_t len)
1984 {
1985         struct ieee80211_local *local = sdata->local;
1986         int tx_last_beacon;
1987         struct sk_buff *skb;
1988         struct ieee80211_mgmt *resp;
1989         u8 *pos, *end;
1990
1991         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1992             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1993             len < 24 + 2 || !ifsta->probe_resp)
1994                 return;
1995
1996         if (local->ops->tx_last_beacon)
1997                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1998         else
1999                 tx_last_beacon = 1;
2000
2001 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2002         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
2003                " (tx_last_beacon=%d)\n",
2004                sdata->dev->name, mgmt->sa, mgmt->da,
2005                mgmt->bssid, tx_last_beacon);
2006 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2007
2008         if (!tx_last_beacon)
2009                 return;
2010
2011         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2012             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2013                 return;
2014
2015         end = ((u8 *) mgmt) + len;
2016         pos = mgmt->u.probe_req.variable;
2017         if (pos[0] != WLAN_EID_SSID ||
2018             pos + 2 + pos[1] > end) {
2019 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2020                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2021                        "from %pM\n",
2022                        sdata->dev->name, mgmt->sa);
2023 #endif
2024                 return;
2025         }
2026         if (pos[1] != 0 &&
2027             (pos[1] != ifsta->ssid_len ||
2028              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2029                 /* Ignore ProbeReq for foreign SSID */
2030                 return;
2031         }
2032
2033         /* Reply with ProbeResp */
2034         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2035         if (!skb)
2036                 return;
2037
2038         resp = (struct ieee80211_mgmt *) skb->data;
2039         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2040 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2041         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
2042                sdata->dev->name, resp->da);
2043 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2044         ieee80211_tx_skb(sdata, skb, 0);
2045 }
2046
2047 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2048                            struct ieee80211_rx_status *rx_status)
2049 {
2050         struct ieee80211_local *local = sdata->local;
2051         struct ieee80211_if_sta *ifsta;
2052         struct ieee80211_mgmt *mgmt;
2053         u16 fc;
2054
2055         if (skb->len < 24)
2056                 goto fail;
2057
2058         ifsta = &sdata->u.sta;
2059
2060         mgmt = (struct ieee80211_mgmt *) skb->data;
2061         fc = le16_to_cpu(mgmt->frame_control);
2062
2063         switch (fc & IEEE80211_FCTL_STYPE) {
2064         case IEEE80211_STYPE_PROBE_REQ:
2065         case IEEE80211_STYPE_PROBE_RESP:
2066         case IEEE80211_STYPE_BEACON:
2067                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2068         case IEEE80211_STYPE_AUTH:
2069         case IEEE80211_STYPE_ASSOC_RESP:
2070         case IEEE80211_STYPE_REASSOC_RESP:
2071         case IEEE80211_STYPE_DEAUTH:
2072         case IEEE80211_STYPE_DISASSOC:
2073                 skb_queue_tail(&ifsta->skb_queue, skb);
2074                 queue_work(local->hw.workqueue, &ifsta->work);
2075                 return;
2076         }
2077
2078  fail:
2079         kfree_skb(skb);
2080 }
2081
2082 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2083                                          struct sk_buff *skb)
2084 {
2085         struct ieee80211_rx_status *rx_status;
2086         struct ieee80211_if_sta *ifsta;
2087         struct ieee80211_mgmt *mgmt;
2088         u16 fc;
2089
2090         ifsta = &sdata->u.sta;
2091
2092         rx_status = (struct ieee80211_rx_status *) skb->cb;
2093         mgmt = (struct ieee80211_mgmt *) skb->data;
2094         fc = le16_to_cpu(mgmt->frame_control);
2095
2096         switch (fc & IEEE80211_FCTL_STYPE) {
2097         case IEEE80211_STYPE_PROBE_REQ:
2098                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2099                 break;
2100         case IEEE80211_STYPE_PROBE_RESP:
2101                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2102                 break;
2103         case IEEE80211_STYPE_BEACON:
2104                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2105                 break;
2106         case IEEE80211_STYPE_AUTH:
2107                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2108                 break;
2109         case IEEE80211_STYPE_ASSOC_RESP:
2110                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2111                 break;
2112         case IEEE80211_STYPE_REASSOC_RESP:
2113                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2114                 break;
2115         case IEEE80211_STYPE_DEAUTH:
2116                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2117                 break;
2118         case IEEE80211_STYPE_DISASSOC:
2119                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2120                 break;
2121         }
2122
2123         kfree_skb(skb);
2124 }
2125
2126
2127 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2128 {
2129         struct ieee80211_local *local = sdata->local;
2130         int active = 0;
2131         struct sta_info *sta;
2132
2133         rcu_read_lock();
2134
2135         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2136                 if (sta->sdata == sdata &&
2137                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2138                                jiffies)) {
2139                         active++;
2140                         break;
2141                 }
2142         }
2143
2144         rcu_read_unlock();
2145
2146         return active;
2147 }
2148
2149
2150 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2151                                      struct ieee80211_if_sta *ifsta)
2152 {
2153         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2154
2155         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2156         if (ieee80211_sta_active_ibss(sdata))
2157                 return;
2158
2159         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2160             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2161                 return;
2162
2163         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2164                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2165         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2166 }
2167
2168
2169 static void ieee80211_sta_timer(unsigned long data)
2170 {
2171         struct ieee80211_sub_if_data *sdata =
2172                 (struct ieee80211_sub_if_data *) data;
2173         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2174         struct ieee80211_local *local = sdata->local;
2175
2176         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2177         queue_work(local->hw.workqueue, &ifsta->work);
2178 }
2179
2180 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2181                                      struct ieee80211_if_sta *ifsta)
2182 {
2183         struct ieee80211_local *local = sdata->local;
2184
2185         if (local->ops->reset_tsf) {
2186                 /* Reset own TSF to allow time synchronization work. */
2187                 local->ops->reset_tsf(local_to_hw(local));
2188         }
2189
2190         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2191
2192
2193         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2194                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2195         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2196                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2197         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2198                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2199         else
2200                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2201         ifsta->auth_transaction = -1;
2202         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2203         ifsta->assoc_scan_tries = 0;
2204         ifsta->direct_probe_tries = 0;
2205         ifsta->auth_tries = 0;
2206         ifsta->assoc_tries = 0;
2207         netif_tx_stop_all_queues(sdata->dev);
2208         netif_carrier_off(sdata->dev);
2209 }
2210
2211
2212 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2213                                     const char *ssid, int ssid_len)
2214 {
2215         int tmp, hidden_ssid;
2216
2217         if (ssid_len == ifsta->ssid_len &&
2218             !memcmp(ifsta->ssid, ssid, ssid_len))
2219                 return 1;
2220
2221         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2222                 return 0;
2223
2224         hidden_ssid = 1;
2225         tmp = ssid_len;
2226         while (tmp--) {
2227                 if (ssid[tmp] != '\0') {
2228                         hidden_ssid = 0;
2229                         break;
2230                 }
2231         }
2232
2233         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2234                 return 1;
2235
2236         if (ssid_len == 1 && ssid[0] == ' ')
2237                 return 1;
2238
2239         return 0;
2240 }
2241
2242 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2243                                      struct ieee80211_if_sta *ifsta)
2244 {
2245         struct ieee80211_local *local = sdata->local;
2246         struct ieee80211_bss *bss;
2247         struct ieee80211_supported_band *sband;
2248         u8 bssid[ETH_ALEN], *pos;
2249         int i;
2250         int ret;
2251
2252         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2253                 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2254         } else {
2255                 /* Generate random, not broadcast, locally administered BSSID. Mix in
2256                  * own MAC address to make sure that devices that do not have proper
2257                  * random number generator get different BSSID. */
2258                 get_random_bytes(bssid, ETH_ALEN);
2259                 for (i = 0; i < ETH_ALEN; i++)
2260                         bssid[i] ^= sdata->dev->dev_addr[i];
2261                 bssid[0] &= ~0x01;
2262                 bssid[0] |= 0x02;
2263         }
2264
2265         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2266                sdata->dev->name, bssid);
2267
2268         bss = ieee80211_rx_bss_add(local, bssid,
2269                                    local->hw.conf.channel->center_freq,
2270                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2271         if (!bss)
2272                 return -ENOMEM;
2273
2274         bss->band = local->hw.conf.channel->band;
2275         sband = local->hw.wiphy->bands[bss->band];
2276
2277         if (local->hw.conf.beacon_int == 0)
2278                 local->hw.conf.beacon_int = 100;
2279         bss->beacon_int = local->hw.conf.beacon_int;
2280         bss->last_update = jiffies;
2281         bss->capability = WLAN_CAPABILITY_IBSS;
2282
2283         if (sdata->default_key)
2284                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2285         else
2286                 sdata->drop_unencrypted = 0;
2287
2288         bss->supp_rates_len = sband->n_bitrates;
2289         pos = bss->supp_rates;
2290         for (i = 0; i < sband->n_bitrates; i++) {
2291                 int rate = sband->bitrates[i].bitrate;
2292                 *pos++ = (u8) (rate / 5);
2293         }
2294
2295         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2296         ieee80211_rx_bss_put(local, bss);
2297         return ret;
2298 }
2299
2300
2301 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2302                                    struct ieee80211_if_sta *ifsta)
2303 {
2304         struct ieee80211_local *local = sdata->local;
2305         struct ieee80211_bss *bss;
2306         int found = 0;
2307         u8 bssid[ETH_ALEN];
2308         int active_ibss;
2309
2310         if (ifsta->ssid_len == 0)
2311                 return -EINVAL;
2312
2313         active_ibss = ieee80211_sta_active_ibss(sdata);
2314 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2315         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2316                sdata->dev->name, active_ibss);
2317 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2318         spin_lock_bh(&local->bss_lock);
2319         list_for_each_entry(bss, &local->bss_list, list) {
2320                 if (ifsta->ssid_len != bss->ssid_len ||
2321                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2322                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2323                         continue;
2324                 if ((ifsta->flags & IEEE80211_STA_BSSID_SET) &&
2325                     memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) != 0)
2326                         continue;
2327 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2328                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2329 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2330                 memcpy(bssid, bss->bssid, ETH_ALEN);
2331                 found = 1;
2332                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2333                         break;
2334         }
2335         spin_unlock_bh(&local->bss_lock);
2336
2337 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2338         if (found)
2339                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2340                        "%pM\n", bssid, ifsta->bssid);
2341 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2342
2343         if (found &&
2344             ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2345              memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0)) {
2346                 int ret;
2347                 int search_freq;
2348
2349                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2350                         search_freq = bss->freq;
2351                 else
2352                         search_freq = local->hw.conf.channel->center_freq;
2353
2354                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2355                                            ifsta->ssid, ifsta->ssid_len);
2356                 if (!bss)
2357                         goto dont_join;
2358
2359                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2360                        " based on configured SSID\n",
2361                        sdata->dev->name, bssid);
2362                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2363                 ieee80211_rx_bss_put(local, bss);
2364                 return ret;
2365         }
2366
2367 dont_join:
2368 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2369         printk(KERN_DEBUG "   did not try to join ibss\n");
2370 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2371
2372         /* Selected IBSS not found in current scan results - try to scan */
2373         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2374             !ieee80211_sta_active_ibss(sdata)) {
2375                 mod_timer(&ifsta->timer, jiffies +
2376                                       IEEE80211_IBSS_MERGE_INTERVAL);
2377         } else if (time_after(jiffies, local->last_scan_completed +
2378                               IEEE80211_SCAN_INTERVAL)) {
2379                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2380                        "join\n", sdata->dev->name);
2381                 return ieee80211_request_scan(sdata, ifsta->ssid,
2382                                               ifsta->ssid_len);
2383         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2384                 int interval = IEEE80211_SCAN_INTERVAL;
2385
2386                 if (time_after(jiffies, ifsta->ibss_join_req +
2387                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2388                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2389                             (!(local->oper_channel->flags &
2390                                         IEEE80211_CHAN_NO_IBSS)))
2391                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2392                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2393                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2394                                        " %d MHz\n", sdata->dev->name,
2395                                        local->hw.conf.channel->center_freq);
2396                         }
2397
2398                         /* No IBSS found - decrease scan interval and continue
2399                          * scanning. */
2400                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2401                 }
2402
2403                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2404                 mod_timer(&ifsta->timer, jiffies + interval);
2405                 return 0;
2406         }
2407
2408         return 0;
2409 }
2410
2411
2412 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2413                                      struct ieee80211_if_sta *ifsta)
2414 {
2415         struct ieee80211_local *local = sdata->local;
2416         struct ieee80211_bss *bss, *selected = NULL;
2417         int top_rssi = 0, freq;
2418
2419         spin_lock_bh(&local->bss_lock);
2420         freq = local->oper_channel->center_freq;
2421         list_for_each_entry(bss, &local->bss_list, list) {
2422                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2423                         continue;
2424
2425                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2426                         IEEE80211_STA_AUTO_BSSID_SEL |
2427                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2428                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2429                      !!sdata->default_key))
2430                         continue;
2431
2432                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2433                     bss->freq != freq)
2434                         continue;
2435
2436                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2437                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2438                         continue;
2439
2440                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2441                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2442                         continue;
2443
2444                 if (!selected || top_rssi < bss->signal) {
2445                         selected = bss;
2446                         top_rssi = bss->signal;
2447                 }
2448         }
2449         if (selected)
2450                 atomic_inc(&selected->users);
2451         spin_unlock_bh(&local->bss_lock);
2452
2453         if (selected) {
2454                 ieee80211_set_freq(sdata, selected->freq);
2455                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2456                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2457                                                selected->ssid_len);
2458                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2459                 ieee80211_sta_def_wmm_params(sdata, selected);
2460                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2461                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2462                 else
2463                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2464
2465                 /* Send out direct probe if no probe resp was received or
2466                  * the one we have is outdated
2467                  */
2468                 if (!selected->last_probe_resp ||
2469                     time_after(jiffies, selected->last_probe_resp
2470                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2471                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2472                 else
2473                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2474
2475                 ieee80211_rx_bss_put(local, selected);
2476                 ieee80211_sta_reset_auth(sdata, ifsta);
2477                 return 0;
2478         } else {
2479                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2480                         ifsta->assoc_scan_tries++;
2481                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2482                                 ieee80211_start_scan(sdata, NULL, 0);
2483                         else
2484                                 ieee80211_start_scan(sdata, ifsta->ssid,
2485                                                          ifsta->ssid_len);
2486                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2487                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2488                 } else {
2489                         ifsta->assoc_scan_tries = 0;
2490                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2491                 }
2492         }
2493         return -1;
2494 }
2495
2496
2497 static void ieee80211_sta_work(struct work_struct *work)
2498 {
2499         struct ieee80211_sub_if_data *sdata =
2500                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2501         struct ieee80211_local *local = sdata->local;
2502         struct ieee80211_if_sta *ifsta;
2503         struct sk_buff *skb;
2504
2505         if (!netif_running(sdata->dev))
2506                 return;
2507
2508         if (local->sw_scanning || local->hw_scanning)
2509                 return;
2510
2511         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2512                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2513                 return;
2514         ifsta = &sdata->u.sta;
2515
2516         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2517                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2518
2519         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2520             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2521             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2522             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2523                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2524                                      ifsta->scan_ssid_len);
2525                 return;
2526         }
2527
2528         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2529                 if (ieee80211_sta_config_auth(sdata, ifsta))
2530                         return;
2531                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2532         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2533                 return;
2534
2535         switch (ifsta->state) {
2536         case IEEE80211_STA_MLME_DISABLED:
2537                 break;
2538         case IEEE80211_STA_MLME_DIRECT_PROBE:
2539                 ieee80211_direct_probe(sdata, ifsta);
2540                 break;
2541         case IEEE80211_STA_MLME_AUTHENTICATE:
2542                 ieee80211_authenticate(sdata, ifsta);
2543                 break;
2544         case IEEE80211_STA_MLME_ASSOCIATE:
2545                 ieee80211_associate(sdata, ifsta);
2546                 break;
2547         case IEEE80211_STA_MLME_ASSOCIATED:
2548                 ieee80211_associated(sdata, ifsta);
2549                 break;
2550         case IEEE80211_STA_MLME_IBSS_SEARCH:
2551                 ieee80211_sta_find_ibss(sdata, ifsta);
2552                 break;
2553         case IEEE80211_STA_MLME_IBSS_JOINED:
2554                 ieee80211_sta_merge_ibss(sdata, ifsta);
2555                 break;
2556         default:
2557                 WARN_ON(1);
2558                 break;
2559         }
2560
2561         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2562                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2563                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2564
2565                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2566                                         WLAN_REASON_UNSPECIFIED);
2567         }
2568 }
2569
2570 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2571 {
2572         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2573                 queue_work(sdata->local->hw.workqueue,
2574                            &sdata->u.sta.work);
2575 }
2576
2577 /* interface setup */
2578 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2579 {
2580         struct ieee80211_if_sta *ifsta;
2581
2582         ifsta = &sdata->u.sta;
2583         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2584         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2585         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2586                     (unsigned long) sdata);
2587         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2588                     (unsigned long) sdata);
2589         skb_queue_head_init(&ifsta->skb_queue);
2590
2591         ifsta->capab = WLAN_CAPABILITY_ESS;
2592         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2593                 IEEE80211_AUTH_ALG_SHARED_KEY;
2594         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2595                 IEEE80211_STA_AUTO_BSSID_SEL |
2596                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2597         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2598                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2599 }
2600
2601 /*
2602  * Add a new IBSS station, will also be called by the RX code when,
2603  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2604  * must be callable in atomic context.
2605  */
2606 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2607                                         u8 *bssid,u8 *addr, u32 supp_rates)
2608 {
2609         struct ieee80211_local *local = sdata->local;
2610         struct sta_info *sta;
2611         int band = local->hw.conf.channel->band;
2612
2613         /* TODO: Could consider removing the least recently used entry and
2614          * allow new one to be added. */
2615         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2616                 if (net_ratelimit()) {
2617                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2618                                "entry %pM\n", sdata->dev->name, addr);
2619                 }
2620                 return NULL;
2621         }
2622
2623         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2624                 return NULL;
2625
2626 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2627         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2628                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2629 #endif
2630
2631         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2632         if (!sta)
2633                 return NULL;
2634
2635         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2636
2637         /* make sure mandatory rates are always added */
2638         sta->sta.supp_rates[band] = supp_rates |
2639                         ieee80211_mandatory_rates(local, band);
2640
2641         rate_control_rate_init(sta);
2642
2643         if (sta_info_insert(sta))
2644                 return NULL;
2645
2646         return sta;
2647 }
2648
2649 /* configuration hooks */
2650 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2651                             struct ieee80211_if_sta *ifsta)
2652 {
2653         struct ieee80211_local *local = sdata->local;
2654
2655         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2656                 return;
2657
2658         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2659                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2660             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2661                              IEEE80211_STA_AUTO_SSID_SEL))) {
2662
2663                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2664                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2665                                                WLAN_REASON_DEAUTH_LEAVING);
2666
2667                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2668                 queue_work(local->hw.workqueue, &ifsta->work);
2669         }
2670 }
2671
2672 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2673 {
2674         struct ieee80211_if_sta *ifsta;
2675
2676         if (len > IEEE80211_MAX_SSID_LEN)
2677                 return -EINVAL;
2678
2679         ifsta = &sdata->u.sta;
2680
2681         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2682                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2683                 memcpy(ifsta->ssid, ssid, len);
2684                 ifsta->ssid_len = len;
2685         }
2686
2687         ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2688
2689         if (len)
2690                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2691         else
2692                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2693
2694         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2695                 ifsta->ibss_join_req = jiffies;
2696                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2697                 return ieee80211_sta_find_ibss(sdata, ifsta);
2698         }
2699
2700         return 0;
2701 }
2702
2703 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2704 {
2705         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2706         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2707         *len = ifsta->ssid_len;
2708         return 0;
2709 }
2710
2711 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2712 {
2713         struct ieee80211_if_sta *ifsta;
2714
2715         ifsta = &sdata->u.sta;
2716
2717         if (is_valid_ether_addr(bssid)) {
2718                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2719                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2720         } else {
2721                 memset(ifsta->bssid, 0, ETH_ALEN);
2722                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2723         }
2724
2725         if (netif_running(sdata->dev)) {
2726                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2727                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2728                                "the low-level driver\n", sdata->dev->name);
2729                 }
2730         }
2731
2732         return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2733 }
2734
2735 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2736 {
2737         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2738
2739         kfree(ifsta->extra_ie);
2740         if (len == 0) {
2741                 ifsta->extra_ie = NULL;
2742                 ifsta->extra_ie_len = 0;
2743                 return 0;
2744         }
2745         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2746         if (!ifsta->extra_ie) {
2747                 ifsta->extra_ie_len = 0;
2748                 return -ENOMEM;
2749         }
2750         memcpy(ifsta->extra_ie, ie, len);
2751         ifsta->extra_ie_len = len;
2752         return 0;
2753 }
2754
2755 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2756 {
2757         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2758
2759         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2760                sdata->dev->name, reason);
2761
2762         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2763             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2764                 return -EINVAL;
2765
2766         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2767         return 0;
2768 }
2769
2770 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2771 {
2772         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2773
2774         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2775                sdata->dev->name, reason);
2776
2777         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2778                 return -EINVAL;
2779
2780         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2781                 return -1;
2782
2783         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2784         return 0;
2785 }
2786
2787 /* scan finished notification */
2788 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2789 {
2790         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2791         struct ieee80211_if_sta *ifsta;
2792
2793         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2794                 ifsta = &sdata->u.sta;
2795                 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2796                     !ieee80211_sta_active_ibss(sdata))
2797                         ieee80211_sta_find_ibss(sdata, ifsta);
2798         }
2799
2800         /* Restart STA timers */
2801         rcu_read_lock();
2802         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2803                 ieee80211_restart_sta_timer(sdata);
2804         rcu_read_unlock();
2805 }
2806
2807 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2808 {
2809         struct ieee80211_local *local =
2810                 container_of(work, struct ieee80211_local,
2811                              dynamic_ps_disable_work);
2812
2813         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2814                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2815                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2816         }
2817
2818         ieee80211_wake_queues_by_reason(&local->hw,
2819                                         IEEE80211_QUEUE_STOP_REASON_PS);
2820 }
2821
2822 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2823 {
2824         struct ieee80211_local *local =
2825                 container_of(work, struct ieee80211_local,
2826                              dynamic_ps_enable_work);
2827         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2828
2829         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2830                 return;
2831
2832         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2833                 ieee80211_send_nullfunc(local, sdata, 1);
2834
2835         local->hw.conf.flags |= IEEE80211_CONF_PS;
2836         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2837 }
2838
2839 void ieee80211_dynamic_ps_timer(unsigned long data)
2840 {
2841         struct ieee80211_local *local = (void *) data;
2842
2843         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2844 }