SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/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->cbss.information_elements;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->cbss.len_information_elements;
  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->cbss.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->cbss.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                                          const size_t supp_rates_len,
 550                                          const u8 *supp_rates)
 551 {
 552         struct ieee80211_local *local = sdata->local;
 553         int i, have_higher_than_11mbit = 0;
 554
 555         /* cf. IEEE 802.11 9.2.12 */
 556         for (i = 0; i < supp_rates_len; i++)
 557                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 558                         have_higher_than_11mbit = 1;
 559
 560         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 561             have_higher_than_11mbit)
 562                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 563         else
 564                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 565
 566         ieee80211_set_wmm_default(sdata);
 567 }
 568
 569 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 570                                      struct ieee80211_if_sta *ifsta,
 571                                      u8 *wmm_param, size_t wmm_param_len)
 572 {
 573         struct ieee80211_tx_queue_params params;
 574         size_t left;
 575         int count;
 576         u8 *pos;
 577
 578         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 579                 return;
 580
 581         if (!wmm_param)
 582                 return;
 583
 584         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 585                 return;
 586         count = wmm_param[6] & 0x0f;
 587         if (count == ifsta->wmm_last_param_set)
 588                 return;
 589         ifsta->wmm_last_param_set = count;
 590
 591         pos = wmm_param + 8;
 592         left = wmm_param_len - 8;
 593
 594         memset(&params, 0, sizeof(params));
 595
 596         if (!local->ops->conf_tx)
 597                 return;
 598
 599         local->wmm_acm = 0;
 600         for (; left >= 4; left -= 4, pos += 4) {
 601                 int aci = (pos[0] >> 5) & 0x03;
 602                 int acm = (pos[0] >> 4) & 0x01;
 603                 int queue;
 604
 605                 switch (aci) {
 606                 case 1:
 607                         queue = 3;
 608                         if (acm)
 609                                 local->wmm_acm |= BIT(0) | BIT(3);
 610                         break;
 611                 case 2:
 612                         queue = 1;
 613                         if (acm)
 614                                 local->wmm_acm |= BIT(4) | BIT(5);
 615                         break;
 616                 case 3:
 617                         queue = 0;
 618                         if (acm)
 619                                 local->wmm_acm |= BIT(6) | BIT(7);
 620                         break;
 621                 case 0:
 622                 default:
 623                         queue = 2;
 624                         if (acm)
 625                                 local->wmm_acm |= BIT(1) | BIT(2);
 626                         break;
 627                 }
 628
 629                 params.aifs = pos[0] & 0x0f;
 630                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 631                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 632                 params.txop = get_unaligned_le16(pos + 2);
 633 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 634                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 635                        "cWmin=%d cWmax=%d txop=%d\n",
 636                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 637                        params.cw_max, params.txop);
 638 #endif
 639                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 640                  * AC for now) */
 641                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 642                         printk(KERN_DEBUG "%s: failed to set TX queue "
 643                                "parameters for queue %d\n", local->mdev->name, queue);
 644                 }
 645         }
 646 }
 647
 648 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 649 {
 650         u8 mask;
 651         u8 index, indexn1, indexn2;
 652         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 653
 654         aid &= 0x3fff;
 655         index = aid / 8;
 656         mask  = 1 << (aid & 7);
 657
 658         indexn1 = tim->bitmap_ctrl & 0xfe;
 659         indexn2 = elems->tim_len + indexn1 - 4;
 660
 661         if (index < indexn1 || index > indexn2)
 662                 return false;
 663
 664         index -= indexn1;
 665
 666         return !!(tim->virtual_map[index] & mask);
 667 }
 668
 669 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 670                                            u16 capab, bool erp_valid, u8 erp)
 671 {
 672         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 673 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 674         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 675 #endif
 676         u32 changed = 0;
 677         bool use_protection;
 678         bool use_short_preamble;
 679         bool use_short_slot;
 680
 681         if (erp_valid) {
 682                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 683                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 684         } else {
 685                 use_protection = false;
 686                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 687         }
 688
 689         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 690
 691         if (use_protection != bss_conf->use_cts_prot) {
 692 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 693                 if (net_ratelimit()) {
 694                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 695                                sdata->dev->name,
 696                                use_protection ? "enabled" : "disabled",
 697                                ifsta->bssid);
 698                 }
 699 #endif
 700                 bss_conf->use_cts_prot = use_protection;
 701                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 702         }
 703
 704         if (use_short_preamble != bss_conf->use_short_preamble) {
 705 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 706                 if (net_ratelimit()) {
 707                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 708                                " (BSSID=%pM)\n",
 709                                sdata->dev->name,
 710                                use_short_preamble ? "short" : "long",
 711                                ifsta->bssid);
 712                 }
 713 #endif
 714                 bss_conf->use_short_preamble = use_short_preamble;
 715                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 716         }
 717
 718         if (use_short_slot != bss_conf->use_short_slot) {
 719 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 720                 if (net_ratelimit()) {
 721                         printk(KERN_DEBUG "%s: switched to %s slot time"
 722                                " (BSSID=%pM)\n",
 723                                sdata->dev->name,
 724                                use_short_slot ? "short" : "long",
 725                                ifsta->bssid);
 726                 }
 727 #endif
 728                 bss_conf->use_short_slot = use_short_slot;
 729                 changed |= BSS_CHANGED_ERP_SLOT;
 730         }
 731
 732         return changed;
 733 }
 734
 735 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 736                                         struct ieee80211_if_sta *ifsta)
 737 {
 738         union iwreq_data wrqu;
 739         memset(&wrqu, 0, sizeof(wrqu));
 740         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 741                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 742         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 743         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 744 }
 745
 746 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 747                                          struct ieee80211_if_sta *ifsta)
 748 {
 749         char *buf;
 750         size_t len;
 751         int i;
 752         union iwreq_data wrqu;
 753
 754         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 755                 return;
 756
 757         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 758                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 759         if (!buf)
 760                 return;
 761
 762         len = sprintf(buf, "ASSOCINFO(");
 763         if (ifsta->assocreq_ies) {
 764                 len += sprintf(buf + len, "ReqIEs=");
 765                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 766                         len += sprintf(buf + len, "%02x",
 767                                        ifsta->assocreq_ies[i]);
 768                 }
 769         }
 770         if (ifsta->assocresp_ies) {
 771                 if (ifsta->assocreq_ies)
 772                         len += sprintf(buf + len, " ");
 773                 len += sprintf(buf + len, "RespIEs=");
 774                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 775                         len += sprintf(buf + len, "%02x",
 776                                        ifsta->assocresp_ies[i]);
 777                 }
 778         }
 779         len += sprintf(buf + len, ")");
 780
 781         if (len > IW_CUSTOM_MAX) {
 782                 len = sprintf(buf, "ASSOCRESPIE=");
 783                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 784                         len += sprintf(buf + len, "%02x",
 785                                        ifsta->assocresp_ies[i]);
 786                 }
 787         }
 788
 789         if (len <= IW_CUSTOM_MAX) {
 790                 memset(&wrqu, 0, sizeof(wrqu));
 791                 wrqu.data.length = len;
 792                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 793         }
 794
 795         kfree(buf);
 796 }
 797
 798
 799 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 800                                      struct ieee80211_if_sta *ifsta,
 801                                      u32 bss_info_changed)
 802 {
 803         struct ieee80211_local *local = sdata->local;
 804         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 805
 806         struct ieee80211_bss *bss;
 807
 808         bss_info_changed |= BSS_CHANGED_ASSOC;
 809         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 810
 811         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 812                                    conf->channel->center_freq,
 813                                    ifsta->ssid, ifsta->ssid_len);
 814         if (bss) {
 815                 /* set timing information */
 816                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 817                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 818                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 819
 820                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 821                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 822
 823                 ieee80211_rx_bss_put(local, bss);
 824         }
 825
 826         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 827         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 828         ieee80211_sta_send_associnfo(sdata, ifsta);
 829
 830         ifsta->last_probe = jiffies;
 831         ieee80211_led_assoc(local, 1);
 832
 833         sdata->vif.bss_conf.assoc = 1;
 834         /*
 835          * For now just always ask the driver to update the basic rateset
 836          * when we have associated, we aren't checking whether it actually
 837          * changed or not.
 838          */
 839         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 840         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 841
 842         if (local->powersave) {
 843                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 844                     local->hw.conf.dynamic_ps_timeout > 0) {
 845                         mod_timer(&local->dynamic_ps_timer, jiffies +
 846                                   msecs_to_jiffies(
 847                                         local->hw.conf.dynamic_ps_timeout));
 848                 } else {
 849                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 850                                 ieee80211_send_nullfunc(local, sdata, 1);
 851                         conf->flags |= IEEE80211_CONF_PS;
 852                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 853                 }
 854         }
 855
 856         netif_tx_start_all_queues(sdata->dev);
 857         netif_carrier_on(sdata->dev);
 858
 859         ieee80211_sta_send_apinfo(sdata, ifsta);
 860 }
 861
 862 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 863                                    struct ieee80211_if_sta *ifsta)
 864 {
 865         ifsta->direct_probe_tries++;
 866         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 867                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 868                        sdata->dev->name, ifsta->bssid);
 869                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 870                 ieee80211_sta_send_apinfo(sdata, ifsta);
 871
 872                 /*
 873                  * Most likely AP is not in the range so remove the
 874                  * bss information associated to the AP
 875                  */
 876                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 877                                 sdata->local->hw.conf.channel->center_freq,
 878                                 ifsta->ssid, ifsta->ssid_len);
 879                 return;
 880         }
 881
 882         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 883                         sdata->dev->name, ifsta->bssid,
 884                         ifsta->direct_probe_tries);
 885
 886         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 887
 888         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 889
 890         /* Direct probe is sent to broadcast address as some APs
 891          * will not answer to direct packet in unassociated state.
 892          */
 893         ieee80211_send_probe_req(sdata, NULL,
 894                                  ifsta->ssid, ifsta->ssid_len);
 895
 896         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 897 }
 898
 899
 900 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 901                                    struct ieee80211_if_sta *ifsta)
 902 {
 903         ifsta->auth_tries++;
 904         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 905                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 906                        " timed out\n",
 907                        sdata->dev->name, ifsta->bssid);
 908                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 909                 ieee80211_sta_send_apinfo(sdata, ifsta);
 910                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 911                                 sdata->local->hw.conf.channel->center_freq,
 912                                 ifsta->ssid, ifsta->ssid_len);
 913                 return;
 914         }
 915
 916         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 917         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 918                sdata->dev->name, ifsta->bssid);
 919
 920         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 921
 922         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 923 }
 924
 925 /*
 926  * The disassoc 'reason' argument can be either our own reason
 927  * if self disconnected or a reason code from the AP.
 928  */
 929 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 930                                    struct ieee80211_if_sta *ifsta, bool deauth,
 931                                    bool self_disconnected, u16 reason)
 932 {
 933         struct ieee80211_local *local = sdata->local;
 934         struct sta_info *sta;
 935         u32 changed = 0, config_changed = 0;
 936
 937         rcu_read_lock();
 938
 939         sta = sta_info_get(local, ifsta->bssid);
 940         if (!sta) {
 941                 rcu_read_unlock();
 942                 return;
 943         }
 944
 945         if (deauth) {
 946                 ifsta->direct_probe_tries = 0;
 947                 ifsta->auth_tries = 0;
 948         }
 949         ifsta->assoc_scan_tries = 0;
 950         ifsta->assoc_tries = 0;
 951
 952         netif_tx_stop_all_queues(sdata->dev);
 953         netif_carrier_off(sdata->dev);
 954
 955         ieee80211_sta_tear_down_BA_sessions(sta);
 956
 957         if (self_disconnected) {
 958                 if (deauth)
 959                         ieee80211_send_deauth_disassoc(sdata,
 960                                 IEEE80211_STYPE_DEAUTH, reason);
 961                 else
 962                         ieee80211_send_deauth_disassoc(sdata,
 963                                 IEEE80211_STYPE_DISASSOC, reason);
 964         }
 965
 966         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 967         changed |= ieee80211_reset_erp_info(sdata);
 968
 969         ieee80211_led_assoc(local, 0);
 970         changed |= BSS_CHANGED_ASSOC;
 971         sdata->vif.bss_conf.assoc = false;
 972
 973         ieee80211_sta_send_apinfo(sdata, ifsta);
 974
 975         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 976                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 977                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 978                                 sdata->local->hw.conf.channel->center_freq,
 979                                 ifsta->ssid, ifsta->ssid_len);
 980         }
 981
 982         rcu_read_unlock();
 983
 984         /* channel(_type) changes are handled by ieee80211_hw_config */
 985         local->oper_channel_type = NL80211_CHAN_NO_HT;
 986
 987         local->power_constr_level = 0;
 988
 989         del_timer_sync(&local->dynamic_ps_timer);
 990         cancel_work_sync(&local->dynamic_ps_enable_work);
 991
 992         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 993                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 994                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 995         }
 996
 997         ieee80211_hw_config(local, config_changed);
 998         ieee80211_bss_info_change_notify(sdata, changed);
 999
1000         rcu_read_lock();
1001
1002         sta = sta_info_get(local, ifsta->bssid);
1003         if (!sta) {
1004                 rcu_read_unlock();
1005                 return;
1006         }
1007
1008         sta_info_unlink(&sta);
1009
1010         rcu_read_unlock();
1011
1012         sta_info_destroy(sta);
1013 }
1014
1015 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1016 {
1017         if (!sdata || !sdata->default_key ||
1018             sdata->default_key->conf.alg != ALG_WEP)
1019                 return 0;
1020         return 1;
1021 }
1022
1023 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
1024                                       struct ieee80211_if_sta *ifsta)
1025 {
1026         struct ieee80211_local *local = sdata->local;
1027         struct ieee80211_bss *bss;
1028         int bss_privacy;
1029         int wep_privacy;
1030         int privacy_invoked;
1031
1032         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1033                 return 0;
1034
1035         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1036                                    local->hw.conf.channel->center_freq,
1037                                    ifsta->ssid, ifsta->ssid_len);
1038         if (!bss)
1039                 return 0;
1040
1041         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1042         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1043         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1044
1045         ieee80211_rx_bss_put(local, bss);
1046
1047         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1048                 return 0;
1049
1050         return 1;
1051 }
1052
1053 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1054                                 struct ieee80211_if_sta *ifsta)
1055 {
1056         ifsta->assoc_tries++;
1057         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1058                 printk(KERN_DEBUG "%s: association with AP %pM"
1059                        " timed out\n",
1060                        sdata->dev->name, ifsta->bssid);
1061                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1062                 ieee80211_sta_send_apinfo(sdata, ifsta);
1063                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
1064                                 sdata->local->hw.conf.channel->center_freq,
1065                                 ifsta->ssid, ifsta->ssid_len);
1066                 return;
1067         }
1068
1069         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1070         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1071                sdata->dev->name, ifsta->bssid);
1072         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1073                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1074                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1075                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1076                 return;
1077         }
1078
1079         ieee80211_send_assoc(sdata, ifsta);
1080
1081         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1082 }
1083
1084
1085 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1086                                  struct ieee80211_if_sta *ifsta)
1087 {
1088         struct ieee80211_local *local = sdata->local;
1089         struct sta_info *sta;
1090         int disassoc;
1091
1092         /* TODO: start monitoring current AP signal quality and number of
1093          * missed beacons. Scan other channels every now and then and search
1094          * for better APs. */
1095         /* TODO: remove expired BSSes */
1096
1097         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1098
1099         rcu_read_lock();
1100
1101         sta = sta_info_get(local, ifsta->bssid);
1102         if (!sta) {
1103                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1104                        sdata->dev->name, ifsta->bssid);
1105                 disassoc = 1;
1106         } else {
1107                 disassoc = 0;
1108                 if (time_after(jiffies,
1109                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1110                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1111                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1112                                        "current AP %pM - assume out of "
1113                                        "range\n",
1114                                        sdata->dev->name, ifsta->bssid);
1115                                 disassoc = 1;
1116                         } else
1117                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1118                                                          ifsta->ssid,
1119                                                          ifsta->ssid_len);
1120                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1121                 } else {
1122                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1123                         if (time_after(jiffies, ifsta->last_probe +
1124                                        IEEE80211_PROBE_INTERVAL)) {
1125                                 ifsta->last_probe = jiffies;
1126                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1127                                                          ifsta->ssid,
1128                                                          ifsta->ssid_len);
1129                         }
1130                 }
1131         }
1132
1133         rcu_read_unlock();
1134
1135         if (disassoc)
1136                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1137                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1138         else
1139                 mod_timer(&ifsta->timer, jiffies +
1140                                       IEEE80211_MONITORING_INTERVAL);
1141 }
1142
1143
1144 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1145                                      struct ieee80211_if_sta *ifsta)
1146 {
1147         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1148         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1149         ieee80211_associate(sdata, ifsta);
1150 }
1151
1152
1153 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1154                                      struct ieee80211_if_sta *ifsta,
1155                                      struct ieee80211_mgmt *mgmt,
1156                                      size_t len)
1157 {
1158         u8 *pos;
1159         struct ieee802_11_elems elems;
1160
1161         pos = mgmt->u.auth.variable;
1162         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1163         if (!elems.challenge)
1164                 return;
1165         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1166                             elems.challenge_len + 2, 1);
1167 }
1168
1169 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
1170                                         struct ieee80211_if_sta *ifsta,
1171                                         struct ieee80211_mgmt *mgmt,
1172                                         size_t len)
1173 {
1174         u16 auth_alg, auth_transaction, status_code;
1175
1176         if (len < 24 + 6)
1177                 return;
1178
1179         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1180         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1181         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1182
1183         /*
1184          * IEEE 802.11 standard does not require authentication in IBSS
1185          * networks and most implementations do not seem to use it.
1186          * However, try to reply to authentication attempts if someone
1187          * has actually implemented this.
1188          */
1189         if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
1190                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1191 }
1192
1193 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1194                                    struct ieee80211_if_sta *ifsta,
1195                                    struct ieee80211_mgmt *mgmt,
1196                                    size_t len)
1197 {
1198         u16 auth_alg, auth_transaction, status_code;
1199
1200         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE)
1201                 return;
1202
1203         if (len < 24 + 6)
1204                 return;
1205
1206         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1207                 return;
1208
1209         if (memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1210                 return;
1211
1212         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1213         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1214         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1215
1216         if (auth_alg != ifsta->auth_alg ||
1217             auth_transaction != ifsta->auth_transaction)
1218                 return;
1219
1220         if (status_code != WLAN_STATUS_SUCCESS) {
1221                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1222                         u8 algs[3];
1223                         const int num_algs = ARRAY_SIZE(algs);
1224                         int i, pos;
1225                         algs[0] = algs[1] = algs[2] = 0xff;
1226                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1227                                 algs[0] = WLAN_AUTH_OPEN;
1228                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1229                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1230                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1231                                 algs[2] = WLAN_AUTH_LEAP;
1232                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1233                                 pos = 0;
1234                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1235                                 pos = 1;
1236                         else
1237                                 pos = 2;
1238                         for (i = 0; i < num_algs; i++) {
1239                                 pos++;
1240                                 if (pos >= num_algs)
1241                                         pos = 0;
1242                                 if (algs[pos] == ifsta->auth_alg ||
1243                                     algs[pos] == 0xff)
1244                                         continue;
1245                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1246                                     !ieee80211_sta_wep_configured(sdata))
1247                                         continue;
1248                                 ifsta->auth_alg = algs[pos];
1249                                 break;
1250                         }
1251                 }
1252                 return;
1253         }
1254
1255         switch (ifsta->auth_alg) {
1256         case WLAN_AUTH_OPEN:
1257         case WLAN_AUTH_LEAP:
1258                 ieee80211_auth_completed(sdata, ifsta);
1259                 break;
1260         case WLAN_AUTH_SHARED_KEY:
1261                 if (ifsta->auth_transaction == 4)
1262                         ieee80211_auth_completed(sdata, ifsta);
1263                 else
1264                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1265                 break;
1266         }
1267 }
1268
1269
1270 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1271                                      struct ieee80211_if_sta *ifsta,
1272                                      struct ieee80211_mgmt *mgmt,
1273                                      size_t len)
1274 {
1275         u16 reason_code;
1276
1277         if (len < 24 + 2)
1278                 return;
1279
1280         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1281                 return;
1282
1283         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1284
1285         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1286                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1287                                 sdata->dev->name, reason_code);
1288
1289         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1290             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1291             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1292                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1293                 mod_timer(&ifsta->timer, jiffies +
1294                                       IEEE80211_RETRY_AUTH_INTERVAL);
1295         }
1296
1297         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1298         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1299 }
1300
1301
1302 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1303                                        struct ieee80211_if_sta *ifsta,
1304                                        struct ieee80211_mgmt *mgmt,
1305                                        size_t len)
1306 {
1307         u16 reason_code;
1308
1309         if (len < 24 + 2)
1310                 return;
1311
1312         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1313                 return;
1314
1315         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1316
1317         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1318                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1319                                 sdata->dev->name, reason_code);
1320
1321         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1322                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1323                 mod_timer(&ifsta->timer, jiffies +
1324                                       IEEE80211_RETRY_AUTH_INTERVAL);
1325         }
1326
1327         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1328 }
1329
1330
1331 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1332                                          struct ieee80211_if_sta *ifsta,
1333                                          struct ieee80211_mgmt *mgmt,
1334                                          size_t len,
1335                                          int reassoc)
1336 {
1337         struct ieee80211_local *local = sdata->local;
1338         struct ieee80211_supported_band *sband;
1339         struct sta_info *sta;
1340         u32 rates, basic_rates;
1341         u16 capab_info, status_code, aid;
1342         struct ieee802_11_elems elems;
1343         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1344         u8 *pos;
1345         u32 changed = 0;
1346         int i, j;
1347         bool have_higher_than_11mbit = false, newsta = false;
1348         u16 ap_ht_cap_flags;
1349
1350         /* AssocResp and ReassocResp have identical structure, so process both
1351          * of them in this function. */
1352
1353         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1354                 return;
1355
1356         if (len < 24 + 6)
1357                 return;
1358
1359         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1360                 return;
1361
1362         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1363         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1364         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1365
1366         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1367                "status=%d aid=%d)\n",
1368                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1369                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1370
1371         pos = mgmt->u.assoc_resp.variable;
1372         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1373
1374         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1375             elems.timeout_int && elems.timeout_int_len == 5 &&
1376             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1377                 u32 tu, ms;
1378                 tu = get_unaligned_le32(elems.timeout_int + 1);
1379                 ms = tu * 1024 / 1000;
1380                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1381                        "comeback duration %u TU (%u ms)\n",
1382                        sdata->dev->name, tu, ms);
1383                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1384                         mod_timer(&ifsta->timer,
1385                                   jiffies + msecs_to_jiffies(ms));
1386                 return;
1387         }
1388
1389         if (status_code != WLAN_STATUS_SUCCESS) {
1390                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1391                        sdata->dev->name, status_code);
1392                 /* if this was a reassociation, ensure we try a "full"
1393                  * association next time. This works around some broken APs
1394                  * which do not correctly reject reassociation requests. */
1395                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1396                 return;
1397         }
1398
1399         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1400                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1401                        "set\n", sdata->dev->name, aid);
1402         aid &= ~(BIT(15) | BIT(14));
1403
1404         if (!elems.supp_rates) {
1405                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1406                        sdata->dev->name);
1407                 return;
1408         }
1409
1410         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1411         ifsta->aid = aid;
1412         ifsta->ap_capab = capab_info;
1413
1414         kfree(ifsta->assocresp_ies);
1415         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1416         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1417         if (ifsta->assocresp_ies)
1418                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1419
1420         rcu_read_lock();
1421
1422         /* Add STA entry for the AP */
1423         sta = sta_info_get(local, ifsta->bssid);
1424         if (!sta) {
1425                 newsta = true;
1426
1427                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1428                 if (!sta) {
1429                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1430                                " the AP\n", sdata->dev->name);
1431                         rcu_read_unlock();
1432                         return;
1433                 }
1434
1435                 /* update new sta with its last rx activity */
1436                 sta->last_rx = jiffies;
1437         }
1438
1439         /*
1440          * FIXME: Do we really need to update the sta_info's information here?
1441          *        We already know about the AP (we found it in our list) so it
1442          *        should already be filled with the right info, no?
1443          *        As is stands, all this is racy because typically we assume
1444          *        the information that is filled in here (except flags) doesn't
1445          *        change while a STA structure is alive. As such, it should move
1446          *        to between the sta_info_alloc() and sta_info_insert() above.
1447          */
1448
1449         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1450                            WLAN_STA_AUTHORIZED);
1451
1452         rates = 0;
1453         basic_rates = 0;
1454         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1455
1456         for (i = 0; i < elems.supp_rates_len; i++) {
1457                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1458                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1459
1460                 if (rate > 110)
1461                         have_higher_than_11mbit = true;
1462
1463                 for (j = 0; j < sband->n_bitrates; j++) {
1464                         if (sband->bitrates[j].bitrate == rate) {
1465                                 rates |= BIT(j);
1466                                 if (is_basic)
1467                                         basic_rates |= BIT(j);
1468                                 break;
1469                         }
1470                 }
1471         }
1472
1473         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1474                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1475                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1476
1477                 if (rate > 110)
1478                         have_higher_than_11mbit = true;
1479
1480                 for (j = 0; j < sband->n_bitrates; j++) {
1481                         if (sband->bitrates[j].bitrate == rate) {
1482                                 rates |= BIT(j);
1483                                 if (is_basic)
1484                                         basic_rates |= BIT(j);
1485                                 break;
1486                         }
1487                 }
1488         }
1489
1490         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1491         sdata->vif.bss_conf.basic_rates = basic_rates;
1492
1493         /* cf. IEEE 802.11 9.2.12 */
1494         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1495             have_higher_than_11mbit)
1496                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1497         else
1498                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1499
1500         if (elems.ht_cap_elem)
1501                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1502                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1503
1504         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1505
1506         rate_control_rate_init(sta);
1507
1508         if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1509                 set_sta_flags(sta, WLAN_STA_MFP);
1510
1511         if (elems.wmm_param)
1512                 set_sta_flags(sta, WLAN_STA_WME);
1513
1514         if (newsta) {
1515                 int err = sta_info_insert(sta);
1516                 if (err) {
1517                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1518                                " the AP (error %d)\n", sdata->dev->name, err);
1519                         rcu_read_unlock();
1520                         return;
1521                 }
1522         }
1523
1524         rcu_read_unlock();
1525
1526         if (elems.wmm_param)
1527                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1528                                          elems.wmm_param_len);
1529
1530         if (elems.ht_info_elem && elems.wmm_param &&
1531             (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
1532             !(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))
1533                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1534                                                ap_ht_cap_flags);
1535
1536         /* set AID and assoc capability,
1537          * ieee80211_set_associated() will tell the driver */
1538         bss_conf->aid = aid;
1539         bss_conf->assoc_capability = capab_info;
1540         ieee80211_set_associated(sdata, ifsta, changed);
1541
1542         ieee80211_associated(sdata, ifsta);
1543 }
1544
1545
1546 static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1547                                      struct ieee80211_if_sta *ifsta,
1548                                      const u8 *bssid, const int beacon_int,
1549                                      const int freq,
1550                                      const size_t supp_rates_len,
1551                                      const u8 *supp_rates,
1552                                      const u16 capability)
1553 {
1554         struct ieee80211_local *local = sdata->local;
1555         int res = 0, rates, i, j;
1556         struct sk_buff *skb;
1557         struct ieee80211_mgmt *mgmt;
1558         u8 *pos;
1559         struct ieee80211_supported_band *sband;
1560         union iwreq_data wrqu;
1561
1562         if (local->ops->reset_tsf) {
1563                 /* Reset own TSF to allow time synchronization work. */
1564                 local->ops->reset_tsf(local_to_hw(local));
1565         }
1566
1567         if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1568            memcmp(ifsta->bssid, bssid, ETH_ALEN) == 0)
1569                 return res;
1570
1571         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1572                             sdata->u.sta.ie_proberesp_len);
1573         if (!skb) {
1574                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1575                        "response\n", sdata->dev->name);
1576                 return -ENOMEM;
1577         }
1578
1579         if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1580                 /* Remove possible STA entries from other IBSS networks. */
1581                 sta_info_flush_delayed(sdata);
1582         }
1583
1584         memcpy(ifsta->bssid, bssid, ETH_ALEN);
1585         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1586         if (res)
1587                 return res;
1588
1589         local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
1590
1591         sdata->drop_unencrypted = capability &
1592                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1593
1594         res = ieee80211_set_freq(sdata, freq);
1595
1596         if (res)
1597                 return res;
1598
1599         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1600
1601         /* Build IBSS probe response */
1602
1603         skb_reserve(skb, local->hw.extra_tx_headroom);
1604
1605         mgmt = (struct ieee80211_mgmt *)
1606                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1607         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1608         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1609                                           IEEE80211_STYPE_PROBE_RESP);
1610         memset(mgmt->da, 0xff, ETH_ALEN);
1611         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1612         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1613         mgmt->u.beacon.beacon_int =
1614                 cpu_to_le16(local->hw.conf.beacon_int);
1615         mgmt->u.beacon.capab_info = cpu_to_le16(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 = 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, supp_rates, rates);
1629
1630         if (sband->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(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 (supp_rates_len > 8) {
1645                 rates = supp_rates_len - 8;
1646                 pos = skb_put(skb, 2 + rates);
1647                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1648                 *pos++ = rates;
1649                 memcpy(pos, &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         for (i = 0; i < supp_rates_len; i++) {
1663                 int bitrate = (supp_rates[i] & 0x7f) * 5;
1664                 for (j = 0; j < sband->n_bitrates; j++)
1665                         if (sband->bitrates[j].bitrate == bitrate)
1666                                 rates |= BIT(j);
1667         }
1668         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1669
1670         ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
1671
1672         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1673         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1674         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1675
1676         ieee80211_led_assoc(local, true);
1677
1678         memset(&wrqu, 0, sizeof(wrqu));
1679         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
1680         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1681
1682         return res;
1683 }
1684
1685 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1686                                    struct ieee80211_if_sta *ifsta,
1687                                    struct ieee80211_bss *bss)
1688 {
1689         return __ieee80211_sta_join_ibss(sdata, ifsta,
1690                                          bss->cbss.bssid,
1691                                          bss->cbss.beacon_interval,
1692                                          bss->cbss.channel->center_freq,
1693                                          bss->supp_rates_len, bss->supp_rates,
1694                                          bss->cbss.capability);
1695 }
1696
1697 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1698                                   struct ieee80211_mgmt *mgmt,
1699                                   size_t len,
1700                                   struct ieee80211_rx_status *rx_status,
1701                                   struct ieee802_11_elems *elems,
1702                                   bool beacon)
1703 {
1704         struct ieee80211_local *local = sdata->local;
1705         int freq;
1706         struct ieee80211_bss *bss;
1707         struct sta_info *sta;
1708         struct ieee80211_channel *channel;
1709         u64 beacon_timestamp, rx_timestamp;
1710         u32 supp_rates = 0;
1711         enum ieee80211_band band = rx_status->band;
1712
1713         if (elems->ds_params && elems->ds_params_len == 1)
1714                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1715         else
1716                 freq = rx_status->freq;
1717
1718         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1719
1720         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1721                 return;
1722
1723         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1724             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1725                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1726
1727                 rcu_read_lock();
1728
1729                 sta = sta_info_get(local, mgmt->sa);
1730                 if (sta) {
1731                         u32 prev_rates;
1732
1733                         prev_rates = sta->sta.supp_rates[band];
1734                         /* make sure mandatory rates are always added */
1735                         sta->sta.supp_rates[band] = supp_rates |
1736                                 ieee80211_mandatory_rates(local, band);
1737
1738 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1739                         if (sta->sta.supp_rates[band] != prev_rates)
1740                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1741                                     "for %pM based on beacon info (0x%llx | "
1742                                     "0x%llx -> 0x%llx)\n",
1743                                     sdata->dev->name,
1744                                     sta->sta.addr,
1745                                     (unsigned long long) prev_rates,
1746                                     (unsigned long long) supp_rates,
1747                                     (unsigned long long) sta->sta.supp_rates[band]);
1748 #endif
1749                 } else {
1750                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1751                 }
1752
1753                 rcu_read_unlock();
1754         }
1755
1756         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1757                                         channel, beacon);
1758         if (!bss)
1759                 return;
1760
1761         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1762             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1763                 struct ieee80211_channel_sw_ie *sw_elem =
1764                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1765                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1766         }
1767
1768         /* was just updated in ieee80211_bss_info_update */
1769         beacon_timestamp = bss->cbss.tsf;
1770
1771         if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1772                 goto put_bss;
1773
1774         /* check if we need to merge IBSS */
1775
1776         /* merge only on beacons (???) */
1777         if (!beacon)
1778                 goto put_bss;
1779
1780         /* we use a fixed BSSID */
1781         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)
1782                 goto put_bss;
1783
1784         /* not an IBSS */
1785         if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
1786                 goto put_bss;
1787
1788         /* different channel */
1789         if (bss->cbss.channel != local->oper_channel)
1790                 goto put_bss;
1791
1792         /* different SSID */
1793         if (elems->ssid_len != sdata->u.sta.ssid_len ||
1794             memcmp(elems->ssid, sdata->u.sta.ssid,
1795                                 sdata->u.sta.ssid_len))
1796                 goto put_bss;
1797
1798         if (rx_status->flag & RX_FLAG_TSFT) {
1799                 /*
1800                  * For correct IBSS merging we need mactime; since mactime is
1801                  * defined as the time the first data symbol of the frame hits
1802                  * the PHY, and the timestamp of the beacon is defined as "the
1803                  * time that the data symbol containing the first bit of the
1804                  * timestamp is transmitted to the PHY plus the transmitting
1805                  * STA's delays through its local PHY from the MAC-PHY
1806                  * interface to its interface with the WM" (802.11 11.1.2)
1807                  * - equals the time this bit arrives at the receiver - we have
1808                  * to take into account the offset between the two.
1809                  *
1810                  * E.g. at 1 MBit that means mactime is 192 usec earlier
1811                  * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1812                  */
1813                 int rate;
1814
1815                 if (rx_status->flag & RX_FLAG_HT)
1816                         rate = 65; /* TODO: HT rates */
1817                 else
1818                         rate = local->hw.wiphy->bands[band]->
1819                                 bitrates[rx_status->rate_idx].bitrate;
1820
1821                 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1822         } else if (local && local->ops && local->ops->get_tsf)
1823                 /* second best option: get current TSF */
1824                 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1825         else
1826                 /* can't merge without knowing the TSF */
1827                 rx_timestamp = -1LLU;
1828
1829 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1830         printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1831                "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1832                mgmt->sa, mgmt->bssid,
1833                (unsigned long long)rx_timestamp,
1834                (unsigned long long)beacon_timestamp,
1835                (unsigned long long)(rx_timestamp - beacon_timestamp),
1836                jiffies);
1837 #endif
1838
1839         if (beacon_timestamp > rx_timestamp) {
1840 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1841                 printk(KERN_DEBUG "%s: beacon TSF higher than "
1842                        "local TSF - IBSS merge with BSSID %pM\n",
1843                        sdata->dev->name, mgmt->bssid);
1844 #endif
1845                 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1846                 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1847         }
1848
1849  put_bss:
1850         ieee80211_rx_bss_put(local, bss);
1851 }
1852
1853
1854 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1855                                          struct ieee80211_mgmt *mgmt,
1856                                          size_t len,
1857                                          struct ieee80211_rx_status *rx_status)
1858 {
1859         size_t baselen;
1860         struct ieee802_11_elems elems;
1861         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1862
1863         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1864                 return; /* ignore ProbeResp to foreign address */
1865
1866         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1867         if (baselen > len)
1868                 return;
1869
1870         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1871                                 &elems);
1872
1873         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1874
1875         /* direct probe may be part of the association flow */
1876         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1877                                                         &ifsta->request)) {
1878                 printk(KERN_DEBUG "%s direct probe responded\n",
1879                        sdata->dev->name);
1880                 ieee80211_authenticate(sdata, ifsta);
1881         }
1882 }
1883
1884
1885 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1886                                      struct ieee80211_mgmt *mgmt,
1887                                      size_t len,
1888                                      struct ieee80211_rx_status *rx_status)
1889 {
1890         struct ieee80211_if_sta *ifsta;
1891         size_t baselen;
1892         struct ieee802_11_elems elems;
1893         struct ieee80211_local *local = sdata->local;
1894         u32 changed = 0;
1895         bool erp_valid, directed_tim;
1896         u8 erp_value = 0;
1897
1898         /* Process beacon from the current BSS */
1899         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1900         if (baselen > len)
1901                 return;
1902
1903         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1904
1905         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1906
1907         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1908                 return;
1909         ifsta = &sdata->u.sta;
1910
1911         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1912             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1913                 return;
1914
1915         if (rx_status->freq != local->hw.conf.channel->center_freq)
1916                 return;
1917
1918         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1919                                  elems.wmm_param_len);
1920
1921         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1922             local->hw.conf.flags & IEEE80211_CONF_PS) {
1923                 directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
1924
1925                 if (directed_tim) {
1926                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1927                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1928                                 ieee80211_hw_config(local,
1929                                                     IEEE80211_CONF_CHANGE_PS);
1930                                 ieee80211_send_nullfunc(local, sdata, 0);
1931                         } else {
1932                                 local->pspolling = true;
1933
1934                                 /*
1935                                  * Here is assumed that the driver will be
1936                                  * able to send ps-poll frame and receive a
1937                                  * response even though power save mode is
1938                                  * enabled, but some drivers might require
1939                                  * to disable power save here. This needs
1940                                  * to be investigated.
1941                                  */
1942                                 ieee80211_send_pspoll(local, sdata);
1943                         }
1944                 }
1945         }
1946
1947         if (elems.erp_info && elems.erp_info_len >= 1) {
1948                 erp_valid = true;
1949                 erp_value = elems.erp_info[0];
1950         } else {
1951                 erp_valid = false;
1952         }
1953         changed |= ieee80211_handle_bss_capability(sdata,
1954                         le16_to_cpu(mgmt->u.beacon.capab_info),
1955                         erp_valid, erp_value);
1956
1957
1958         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1959             !(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1960                 struct sta_info *sta;
1961                 struct ieee80211_supported_band *sband;
1962                 u16 ap_ht_cap_flags;
1963
1964                 rcu_read_lock();
1965
1966                 sta = sta_info_get(local, ifsta->bssid);
1967                 if (!sta) {
1968                         rcu_read_unlock();
1969                         return;
1970                 }
1971
1972                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1973
1974                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1975                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1976
1977                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1978
1979                 rcu_read_unlock();
1980
1981                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1982                                                ap_ht_cap_flags);
1983         }
1984
1985         if (elems.country_elem) {
1986                 /* Note we are only reviewing this on beacons
1987                  * for the BSSID we are associated to */
1988                 regulatory_hint_11d(local->hw.wiphy,
1989                         elems.country_elem, elems.country_elem_len);
1990
1991                 /* TODO: IBSS also needs this */
1992                 if (elems.pwr_constr_elem)
1993                         ieee80211_handle_pwr_constr(sdata,
1994                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1995                                 elems.pwr_constr_elem,
1996                                 elems.pwr_constr_elem_len);
1997         }
1998
1999         ieee80211_bss_info_change_notify(sdata, changed);
2000 }
2001
2002
2003 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
2004                                         struct ieee80211_if_sta *ifsta,
2005                                         struct ieee80211_mgmt *mgmt,
2006                                         size_t len)
2007 {
2008         struct ieee80211_local *local = sdata->local;
2009         int tx_last_beacon;
2010         struct sk_buff *skb;
2011         struct ieee80211_mgmt *resp;
2012         u8 *pos, *end;
2013
2014         if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
2015             len < 24 + 2 || !ifsta->probe_resp)
2016                 return;
2017
2018         if (local->ops->tx_last_beacon)
2019                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2020         else
2021                 tx_last_beacon = 1;
2022
2023 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2024         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
2025                " (tx_last_beacon=%d)\n",
2026                sdata->dev->name, mgmt->sa, mgmt->da,
2027                mgmt->bssid, tx_last_beacon);
2028 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2029
2030         if (!tx_last_beacon)
2031                 return;
2032
2033         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2034             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2035                 return;
2036
2037         end = ((u8 *) mgmt) + len;
2038         pos = mgmt->u.probe_req.variable;
2039         if (pos[0] != WLAN_EID_SSID ||
2040             pos + 2 + pos[1] > end) {
2041 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2042                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2043                        "from %pM\n",
2044                        sdata->dev->name, mgmt->sa);
2045 #endif
2046                 return;
2047         }
2048         if (pos[1] != 0 &&
2049             (pos[1] != ifsta->ssid_len ||
2050              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2051                 /* Ignore ProbeReq for foreign SSID */
2052                 return;
2053         }
2054
2055         /* Reply with ProbeResp */
2056         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2057         if (!skb)
2058                 return;
2059
2060         resp = (struct ieee80211_mgmt *) skb->data;
2061         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2062 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2063         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
2064                sdata->dev->name, resp->da);
2065 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2066         ieee80211_tx_skb(sdata, skb, 0);
2067 }
2068
2069 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2070                            struct ieee80211_rx_status *rx_status)
2071 {
2072         struct ieee80211_local *local = sdata->local;
2073         struct ieee80211_if_sta *ifsta;
2074         struct ieee80211_mgmt *mgmt;
2075         u16 fc;
2076
2077         if (skb->len < 24)
2078                 goto fail;
2079
2080         ifsta = &sdata->u.sta;
2081
2082         mgmt = (struct ieee80211_mgmt *) skb->data;
2083         fc = le16_to_cpu(mgmt->frame_control);
2084
2085         switch (fc & IEEE80211_FCTL_STYPE) {
2086         case IEEE80211_STYPE_PROBE_REQ:
2087         case IEEE80211_STYPE_PROBE_RESP:
2088         case IEEE80211_STYPE_BEACON:
2089                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2090         case IEEE80211_STYPE_AUTH:
2091         case IEEE80211_STYPE_ASSOC_RESP:
2092         case IEEE80211_STYPE_REASSOC_RESP:
2093         case IEEE80211_STYPE_DEAUTH:
2094         case IEEE80211_STYPE_DISASSOC:
2095                 skb_queue_tail(&ifsta->skb_queue, skb);
2096                 queue_work(local->hw.workqueue, &ifsta->work);
2097                 return;
2098         }
2099
2100  fail:
2101         kfree_skb(skb);
2102 }
2103
2104 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2105                                          struct sk_buff *skb)
2106 {
2107         struct ieee80211_rx_status *rx_status;
2108         struct ieee80211_if_sta *ifsta;
2109         struct ieee80211_mgmt *mgmt;
2110         u16 fc;
2111
2112         ifsta = &sdata->u.sta;
2113
2114         rx_status = (struct ieee80211_rx_status *) skb->cb;
2115         mgmt = (struct ieee80211_mgmt *) skb->data;
2116         fc = le16_to_cpu(mgmt->frame_control);
2117
2118         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2119                 switch (fc & IEEE80211_FCTL_STYPE) {
2120                 case IEEE80211_STYPE_PROBE_REQ:
2121                         ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt,
2122                                                     skb->len);
2123                         break;
2124                 case IEEE80211_STYPE_PROBE_RESP:
2125                         ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2126                                                      rx_status);
2127                         break;
2128                 case IEEE80211_STYPE_BEACON:
2129                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2130                                                  rx_status);
2131                         break;
2132                 case IEEE80211_STYPE_AUTH:
2133                         ieee80211_rx_mgmt_auth_ibss(sdata, ifsta, mgmt,
2134                                                     skb->len);
2135                         break;
2136                 }
2137         } else { /* NL80211_IFTYPE_STATION */
2138                 switch (fc & IEEE80211_FCTL_STYPE) {
2139                 case IEEE80211_STYPE_PROBE_RESP:
2140                         ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2141                                                      rx_status);
2142                         break;
2143                 case IEEE80211_STYPE_BEACON:
2144                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2145                                                  rx_status);
2146                         break;
2147                 case IEEE80211_STYPE_AUTH:
2148                         ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2149                         break;
2150                 case IEEE80211_STYPE_ASSOC_RESP:
2151                         ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt,
2152                                                      skb->len, 0);
2153                         break;
2154                 case IEEE80211_STYPE_REASSOC_RESP:
2155                         ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt,
2156                                                      skb->len, 1);
2157                         break;
2158                 case IEEE80211_STYPE_DEAUTH:
2159                         ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2160                         break;
2161                 case IEEE80211_STYPE_DISASSOC:
2162                         ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt,
2163                                                    skb->len);
2164                         break;
2165                 }
2166         }
2167
2168         kfree_skb(skb);
2169 }
2170
2171
2172 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2173 {
2174         struct ieee80211_local *local = sdata->local;
2175         int active = 0;
2176         struct sta_info *sta;
2177
2178         rcu_read_lock();
2179
2180         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2181                 if (sta->sdata == sdata &&
2182                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2183                                jiffies)) {
2184                         active++;
2185                         break;
2186                 }
2187         }
2188
2189         rcu_read_unlock();
2190
2191         return active;
2192 }
2193
2194
2195 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2196                                      struct ieee80211_if_sta *ifsta)
2197 {
2198         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2199
2200         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2201         if (ieee80211_sta_active_ibss(sdata))
2202                 return;
2203
2204         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2205             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2206                 return;
2207
2208         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2209                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2210
2211         /* XXX maybe racy? */
2212         if (sdata->local->scan_req)
2213                 return;
2214
2215         memcpy(sdata->local->int_scan_req.ssids[0].ssid,
2216                ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2217         sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2218         ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
2219 }
2220
2221
2222 static void ieee80211_sta_timer(unsigned long data)
2223 {
2224         struct ieee80211_sub_if_data *sdata =
2225                 (struct ieee80211_sub_if_data *) data;
2226         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2227         struct ieee80211_local *local = sdata->local;
2228
2229         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2230         queue_work(local->hw.workqueue, &ifsta->work);
2231 }
2232
2233 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2234                                      struct ieee80211_if_sta *ifsta)
2235 {
2236         struct ieee80211_local *local = sdata->local;
2237
2238         if (local->ops->reset_tsf) {
2239                 /* Reset own TSF to allow time synchronization work. */
2240                 local->ops->reset_tsf(local_to_hw(local));
2241         }
2242
2243         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2244
2245
2246         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2247                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2248         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2249                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2250         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2251                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2252         else
2253                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2254         ifsta->auth_transaction = -1;
2255         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2256         ifsta->assoc_scan_tries = 0;
2257         ifsta->direct_probe_tries = 0;
2258         ifsta->auth_tries = 0;
2259         ifsta->assoc_tries = 0;
2260         netif_tx_stop_all_queues(sdata->dev);
2261         netif_carrier_off(sdata->dev);
2262 }
2263
2264 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2265                                      struct ieee80211_if_sta *ifsta)
2266 {
2267         struct ieee80211_local *local = sdata->local;
2268         struct ieee80211_supported_band *sband;
2269         u8 *pos;
2270         u8 bssid[ETH_ALEN];
2271         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
2272         u16 capability;
2273         int i;
2274
2275         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2276                 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2277         } else {
2278                 /* Generate random, not broadcast, locally administered BSSID. Mix in
2279                  * own MAC address to make sure that devices that do not have proper
2280                  * random number generator get different BSSID. */
2281                 get_random_bytes(bssid, ETH_ALEN);
2282                 for (i = 0; i < ETH_ALEN; i++)
2283                         bssid[i] ^= sdata->dev->dev_addr[i];
2284                 bssid[0] &= ~0x01;
2285                 bssid[0] |= 0x02;
2286         }
2287
2288         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2289                sdata->dev->name, bssid);
2290
2291         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2292
2293         if (local->hw.conf.beacon_int == 0)
2294                 local->hw.conf.beacon_int = 100;
2295
2296         capability = WLAN_CAPABILITY_IBSS;
2297
2298         if (sdata->default_key)
2299                 capability |= WLAN_CAPABILITY_PRIVACY;
2300         else
2301                 sdata->drop_unencrypted = 0;
2302
2303         pos = supp_rates;
2304         for (i = 0; i < sband->n_bitrates; i++) {
2305                 int rate = sband->bitrates[i].bitrate;
2306                 *pos++ = (u8) (rate / 5);
2307         }
2308
2309         return __ieee80211_sta_join_ibss(sdata, ifsta,
2310                                          bssid, local->hw.conf.beacon_int,
2311                                          local->hw.conf.channel->center_freq,
2312                                          sband->n_bitrates, supp_rates,
2313                                          capability);
2314 }
2315
2316
2317 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2318                                    struct ieee80211_if_sta *ifsta)
2319 {
2320         struct ieee80211_local *local = sdata->local;
2321         struct ieee80211_bss *bss;
2322         int active_ibss;
2323
2324         if (ifsta->ssid_len == 0)
2325                 return -EINVAL;
2326
2327         active_ibss = ieee80211_sta_active_ibss(sdata);
2328 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2329         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2330                sdata->dev->name, active_ibss);
2331 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2332
2333         if (active_ibss)
2334                 return 0;
2335
2336         if (ifsta->flags & IEEE80211_STA_BSSID_SET)
2337                 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 0,
2338                                            ifsta->ssid, ifsta->ssid_len);
2339         else
2340                 bss = (void *)cfg80211_get_ibss(local->hw.wiphy,
2341                                                 NULL,
2342                                                 ifsta->ssid, ifsta->ssid_len);
2343
2344 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2345         if (bss)
2346                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2347                        "%pM\n", bss->cbss.bssid, ifsta->bssid);
2348 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2349
2350         if (bss &&
2351             (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) ||
2352              memcmp(ifsta->bssid, bss->cbss.bssid, ETH_ALEN))) {
2353                 int ret;
2354
2355                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2356                        " based on configured SSID\n",
2357                        sdata->dev->name, bss->cbss.bssid);
2358
2359                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2360                 ieee80211_rx_bss_put(local, bss);
2361                 return ret;
2362         } else if (bss)
2363                 ieee80211_rx_bss_put(local, bss);
2364
2365 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2366         printk(KERN_DEBUG "   did not try to join ibss\n");
2367 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2368
2369         /* Selected IBSS not found in current scan results - try to scan */
2370         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2371             !ieee80211_sta_active_ibss(sdata)) {
2372                 mod_timer(&ifsta->timer, jiffies +
2373                                       IEEE80211_IBSS_MERGE_INTERVAL);
2374         } else if (time_after(jiffies, local->last_scan_completed +
2375                               IEEE80211_SCAN_INTERVAL)) {
2376                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2377                        "join\n", sdata->dev->name);
2378
2379                 /* XXX maybe racy? */
2380                 if (local->scan_req)
2381                         return -EBUSY;
2382
2383                 memcpy(local->int_scan_req.ssids[0].ssid,
2384                        ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2385                 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2386                 return ieee80211_request_scan(sdata, &local->int_scan_req);
2387         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2388                 int interval = IEEE80211_SCAN_INTERVAL;
2389
2390                 if (time_after(jiffies, ifsta->ibss_join_req +
2391                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2392                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2393                             (!(local->oper_channel->flags &
2394                                         IEEE80211_CHAN_NO_IBSS)))
2395                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2396                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2397                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2398                                        " %d MHz\n", sdata->dev->name,
2399                                        local->hw.conf.channel->center_freq);
2400                         }
2401
2402                         /* No IBSS found - decrease scan interval and continue
2403                          * scanning. */
2404                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2405                 }
2406
2407                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2408                 mod_timer(&ifsta->timer, jiffies + interval);
2409                 return 0;
2410         }
2411
2412         return 0;
2413 }
2414
2415
2416 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2417                                      struct ieee80211_if_sta *ifsta)
2418 {
2419         struct ieee80211_local *local = sdata->local;
2420         struct ieee80211_bss *bss;
2421         u8 *bssid = ifsta->bssid, *ssid = ifsta->ssid;
2422         u8 ssid_len = ifsta->ssid_len;
2423         u16 capa_mask = WLAN_CAPABILITY_ESS;
2424         u16 capa_val = WLAN_CAPABILITY_ESS;
2425         struct ieee80211_channel *chan = local->oper_channel;
2426
2427         if (ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2428                             IEEE80211_STA_AUTO_BSSID_SEL |
2429                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2430                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2431                 if (sdata->default_key)
2432                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2433         }
2434
2435         if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2436                 chan = NULL;
2437
2438         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2439                 bssid = NULL;
2440
2441         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2442                 ssid = NULL;
2443                 ssid_len = 0;
2444         }
2445
2446         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2447                                        bssid, ssid, ssid_len,
2448                                        capa_mask, capa_val);
2449
2450         if (bss) {
2451                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2452                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2453                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2454                                                bss->ssid_len);
2455                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2456                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2457                                                     bss->supp_rates);
2458                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2459                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2460                 else
2461                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2462
2463                 /* Send out direct probe if no probe resp was received or
2464                  * the one we have is outdated
2465                  */
2466                 if (!bss->last_probe_resp ||
2467                     time_after(jiffies, bss->last_probe_resp
2468                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2469                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2470                 else
2471                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2472
2473                 ieee80211_rx_bss_put(local, bss);
2474                 ieee80211_sta_reset_auth(sdata, ifsta);
2475                 return 0;
2476         } else {
2477                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2478                         ifsta->assoc_scan_tries++;
2479                         /* XXX maybe racy? */
2480                         if (local->scan_req)
2481                                 return -1;
2482                         memcpy(local->int_scan_req.ssids[0].ssid,
2483                                ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2484                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2485                                 local->int_scan_req.ssids[0].ssid_len = 0;
2486                         else
2487                                 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2488                         ieee80211_start_scan(sdata, &local->int_scan_req);
2489                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2490                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2491                 } else {
2492                         ifsta->assoc_scan_tries = 0;
2493                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2494                 }
2495         }
2496         return -1;
2497 }
2498
2499
2500 static void ieee80211_sta_work(struct work_struct *work)
2501 {
2502         struct ieee80211_sub_if_data *sdata =
2503                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2504         struct ieee80211_local *local = sdata->local;
2505         struct ieee80211_if_sta *ifsta;
2506         struct sk_buff *skb;
2507
2508         if (!netif_running(sdata->dev))
2509                 return;
2510
2511         if (local->sw_scanning || local->hw_scanning)
2512                 return;
2513
2514         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2515                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2516                 return;
2517         ifsta = &sdata->u.sta;
2518
2519         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2520                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2521
2522         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2523             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2524             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2525             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2526                 ieee80211_start_scan(sdata, local->scan_req);
2527                 return;
2528         }
2529
2530         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2531                 if (ieee80211_sta_config_auth(sdata, ifsta))
2532                         return;
2533                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2534         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2535                 return;
2536
2537         switch (ifsta->state) {
2538         case IEEE80211_STA_MLME_DISABLED:
2539                 break;
2540         case IEEE80211_STA_MLME_DIRECT_PROBE:
2541                 ieee80211_direct_probe(sdata, ifsta);
2542                 break;
2543         case IEEE80211_STA_MLME_AUTHENTICATE:
2544                 ieee80211_authenticate(sdata, ifsta);
2545                 break;
2546         case IEEE80211_STA_MLME_ASSOCIATE:
2547                 ieee80211_associate(sdata, ifsta);
2548                 break;
2549         case IEEE80211_STA_MLME_ASSOCIATED:
2550                 ieee80211_associated(sdata, ifsta);
2551                 break;
2552         case IEEE80211_STA_MLME_IBSS_SEARCH:
2553                 ieee80211_sta_find_ibss(sdata, ifsta);
2554                 break;
2555         case IEEE80211_STA_MLME_IBSS_JOINED:
2556                 ieee80211_sta_merge_ibss(sdata, ifsta);
2557                 break;
2558         default:
2559                 WARN_ON(1);
2560                 break;
2561         }
2562
2563         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2564                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2565                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2566
2567                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2568                                         WLAN_REASON_UNSPECIFIED);
2569         }
2570 }
2571
2572 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2573 {
2574         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2575                 queue_work(sdata->local->hw.workqueue,
2576                            &sdata->u.sta.work);
2577 }
2578
2579 /* interface setup */
2580 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2581 {
2582         struct ieee80211_if_sta *ifsta;
2583
2584         ifsta = &sdata->u.sta;
2585         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2586         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2587         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2588                     (unsigned long) sdata);
2589         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2590                     (unsigned long) sdata);
2591         skb_queue_head_init(&ifsta->skb_queue);
2592
2593         ifsta->capab = WLAN_CAPABILITY_ESS;
2594         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2595                 IEEE80211_AUTH_ALG_SHARED_KEY;
2596         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2597                 IEEE80211_STA_AUTO_BSSID_SEL |
2598                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2599         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2600                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2601 }
2602
2603 /*
2604  * Add a new IBSS station, will also be called by the RX code when,
2605  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2606  * must be callable in atomic context.
2607  */
2608 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2609                                         u8 *bssid,u8 *addr, u32 supp_rates)
2610 {
2611         struct ieee80211_local *local = sdata->local;
2612         struct sta_info *sta;
2613         int band = local->hw.conf.channel->band;
2614
2615         /* TODO: Could consider removing the least recently used entry and
2616          * allow new one to be added. */
2617         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2618                 if (net_ratelimit()) {
2619                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2620                                "entry %pM\n", sdata->dev->name, addr);
2621                 }
2622                 return NULL;
2623         }
2624
2625         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2626                 return NULL;
2627
2628 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2629         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2630                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2631 #endif
2632
2633         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2634         if (!sta)
2635                 return NULL;
2636
2637         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2638
2639         /* make sure mandatory rates are always added */
2640         sta->sta.supp_rates[band] = supp_rates |
2641                         ieee80211_mandatory_rates(local, band);
2642
2643         rate_control_rate_init(sta);
2644
2645         if (sta_info_insert(sta))
2646                 return NULL;
2647
2648         return sta;
2649 }
2650
2651 /* configuration hooks */
2652 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2653                             struct ieee80211_if_sta *ifsta)
2654 {
2655         struct ieee80211_local *local = sdata->local;
2656
2657         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2658                 return;
2659
2660         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2661                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2662             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2663                              IEEE80211_STA_AUTO_SSID_SEL))) {
2664
2665                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2666                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2667                                                WLAN_REASON_DEAUTH_LEAVING);
2668
2669                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2670                 queue_work(local->hw.workqueue, &ifsta->work);
2671         }
2672 }
2673
2674 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2675 {
2676         struct ieee80211_if_sta *ifsta;
2677
2678         if (len > IEEE80211_MAX_SSID_LEN)
2679                 return -EINVAL;
2680
2681         ifsta = &sdata->u.sta;
2682
2683         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2684                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2685                 memcpy(ifsta->ssid, ssid, len);
2686                 ifsta->ssid_len = len;
2687         }
2688
2689         ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2690
2691         if (len)
2692                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2693         else
2694                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2695
2696         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2697                 ifsta->ibss_join_req = jiffies;
2698                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2699                 return ieee80211_sta_find_ibss(sdata, ifsta);
2700         }
2701
2702         return 0;
2703 }
2704
2705 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2706 {
2707         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2708         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2709         *len = ifsta->ssid_len;
2710         return 0;
2711 }
2712
2713 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2714 {
2715         struct ieee80211_if_sta *ifsta;
2716
2717         ifsta = &sdata->u.sta;
2718
2719         if (is_valid_ether_addr(bssid)) {
2720                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2721                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2722         } else {
2723                 memset(ifsta->bssid, 0, ETH_ALEN);
2724                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2725         }
2726
2727         if (netif_running(sdata->dev)) {
2728                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2729                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2730                                "the low-level driver\n", sdata->dev->name);
2731                 }
2732         }
2733
2734         return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2735 }
2736
2737 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2738 {
2739         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2740
2741         kfree(ifsta->extra_ie);
2742         if (len == 0) {
2743                 ifsta->extra_ie = NULL;
2744                 ifsta->extra_ie_len = 0;
2745                 return 0;
2746         }
2747         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2748         if (!ifsta->extra_ie) {
2749                 ifsta->extra_ie_len = 0;
2750                 return -ENOMEM;
2751         }
2752         memcpy(ifsta->extra_ie, ie, len);
2753         ifsta->extra_ie_len = len;
2754         return 0;
2755 }
2756
2757 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2758 {
2759         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2760
2761         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2762                sdata->dev->name, reason);
2763
2764         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2765             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2766                 return -EINVAL;
2767
2768         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2769         return 0;
2770 }
2771
2772 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2773 {
2774         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2775
2776         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2777                sdata->dev->name, reason);
2778
2779         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2780                 return -EINVAL;
2781
2782         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2783                 return -1;
2784
2785         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2786         return 0;
2787 }
2788
2789 /* scan finished notification */
2790 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2791 {
2792         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2793         struct ieee80211_if_sta *ifsta;
2794
2795         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2796                 ifsta = &sdata->u.sta;
2797                 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2798                     !ieee80211_sta_active_ibss(sdata))
2799                         ieee80211_sta_find_ibss(sdata, ifsta);
2800         }
2801
2802         /* Restart STA timers */
2803         rcu_read_lock();
2804         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2805                 ieee80211_restart_sta_timer(sdata);
2806         rcu_read_unlock();
2807 }
2808
2809 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2810 {
2811         struct ieee80211_local *local =
2812                 container_of(work, struct ieee80211_local,
2813                              dynamic_ps_disable_work);
2814
2815         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2816                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2817                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2818         }
2819
2820         ieee80211_wake_queues_by_reason(&local->hw,
2821                                         IEEE80211_QUEUE_STOP_REASON_PS);
2822 }
2823
2824 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2825 {
2826         struct ieee80211_local *local =
2827                 container_of(work, struct ieee80211_local,
2828                              dynamic_ps_enable_work);
2829         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2830
2831         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2832                 return;
2833
2834         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2835                 ieee80211_send_nullfunc(local, sdata, 1);
2836
2837         local->hw.conf.flags |= IEEE80211_CONF_PS;
2838         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2839 }
2840
2841 void ieee80211_dynamic_ps_timer(unsigned long data)
2842 {
2843         struct ieee80211_local *local = (void *) data;
2844
2845         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2846 }